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+			    ======================
+			    RxRPC NETWORK PROTOCOL
+			    ======================
+
+The RxRPC protocol driver provides a reliable two-phase transport on top of UDP
+that can be used to perform RxRPC remote operations.  This is done over sockets
+of AF_RXRPC family, using sendmsg() and recvmsg() with control data to send and
+receive data, aborts and errors.
+
+Contents of this document:
+
+ (*) Overview.
+
+ (*) RxRPC protocol summary.
+
+ (*) AF_RXRPC driver model.
+
+ (*) Control messages.
+
+ (*) Socket options.
+
+ (*) Security.
+
+ (*) Example client usage.
+
+ (*) Example server usage.
+
+
+========
+OVERVIEW
+========
+
+RxRPC is a two-layer protocol.  There is a session layer which provides
+reliable virtual connections using UDP over IPv4 (or IPv6) as the transport
+layer, but implements a real network protocol; and there's the presentation
+layer which renders structured data to binary blobs and back again using XDR
+(as does SunRPC):
+
+		+-------------+
+		| Application |
+		+-------------+
+		|     XDR     |		Presentation
+		+-------------+
+		|    RxRPC    |		Session
+		+-------------+
+		|     UDP     |		Transport
+		+-------------+
+
+
+AF_RXRPC provides:
+
+ (1) Part of an RxRPC facility for both kernel and userspace applications by
+     making the session part of it a Linux network protocol (AF_RXRPC).
+
+ (2) A two-phase protocol.  The client transmits a blob (the request) and then
+     receives a blob (the reply), and the server receives the request and then
+     transmits the reply.
+
+ (3) Retention of the reusable bits of the transport system set up for one call
+     to speed up subsequent calls.
+
+ (4) A secure protocol, using the Linux kernel's key retention facility to
+     manage security on the client end.  The server end must of necessity be
+     more active in security negotiations.
+
+AF_RXRPC does not provide XDR marshalling/presentation facilities.  That is
+left to the application.  AF_RXRPC only deals in blobs.  Even the operation ID
+is just the first four bytes of the request blob, and as such is beyond the
+kernel's interest.
+
+
+Sockets of AF_RXRPC family are:
+
+ (1) created as type SOCK_DGRAM;
+
+ (2) provided with a protocol of the type of underlying transport they're going
+     to use - currently only PF_INET is supported.
+
+
+The Andrew File System (AFS) is an example of an application that uses this and
+that has both kernel (filesystem) and userspace (utility) components.
+
+
+======================
+RXRPC PROTOCOL SUMMARY
+======================
+
+An overview of the RxRPC protocol:
+
+ (*) RxRPC sits on top of another networking protocol (UDP is the only option
+     currently), and uses this to provide network transport.  UDP ports, for
+     example, provide transport endpoints.
+
+ (*) RxRPC supports multiple virtual "connections" from any given transport
+     endpoint, thus allowing the endpoints to be shared, even to the same
+     remote endpoint.
+
+ (*) Each connection goes to a particular "service".  A connection may not go
+     to multiple services.  A service may be considered the RxRPC equivalent of
+     a port number.  AF_RXRPC permits multiple services to share an endpoint.
+
+ (*) Client-originating packets are marked, thus a transport endpoint can be
+     shared between client and server connections (connections have a
+     direction).
+
+ (*) Up to a billion connections may be supported concurrently between one
+     local transport endpoint and one service on one remote endpoint.  An RxRPC
+     connection is described by seven numbers:
+
+	Local address	}
+	Local port	} Transport (UDP) address
+	Remote address	}
+	Remote port	}
+	Direction
+	Connection ID
+	Service ID
+
+ (*) Each RxRPC operation is a "call".  A connection may make up to four
+     billion calls, but only up to four calls may be in progress on a
+     connection at any one time.
+
+ (*) Calls are two-phase and asymmetric: the client sends its request data,
+     which the service receives; then the service transmits the reply data
+     which the client receives.
+
+ (*) The data blobs are of indefinite size, the end of a phase is marked with a
+     flag in the packet.  The number of packets of data making up one blob may
+     not exceed 4 billion, however, as this would cause the sequence number to
+     wrap.
+
+ (*) The first four bytes of the request data are the service operation ID.
+
+ (*) Security is negotiated on a per-connection basis.  The connection is
+     initiated by the first data packet on it arriving.  If security is
+     requested, the server then issues a "challenge" and then the client
+     replies with a "response".  If the response is successful, the security is
+     set for the lifetime of that connection, and all subsequent calls made
+     upon it use that same security.  In the event that the server lets a
+     connection lapse before the client, the security will be renegotiated if
+     the client uses the connection again.
+
+ (*) Calls use ACK packets to handle reliability.  Data packets are also
+     explicitly sequenced per call.
+
+ (*) There are two types of positive acknowledgement: hard-ACKs and soft-ACKs.
+     A hard-ACK indicates to the far side that all the data received to a point
+     has been received and processed; a soft-ACK indicates that the data has
+     been received but may yet be discarded and re-requested.  The sender may
+     not discard any transmittable packets until they've been hard-ACK'd.
+
+ (*) Reception of a reply data packet implicitly hard-ACK's all the data
+     packets that make up the request.
+
+ (*) An call is complete when the request has been sent, the reply has been
+     received and the final hard-ACK on the last packet of the reply has
+     reached the server.
+
+ (*) An call may be aborted by either end at any time up to its completion.
+
+
+=====================
+AF_RXRPC DRIVER MODEL
+=====================
+
+About the AF_RXRPC driver:
+
+ (*) The AF_RXRPC protocol transparently uses internal sockets of the transport
+     protocol to represent transport endpoints.
+
+ (*) AF_RXRPC sockets map onto RxRPC connection bundles.  Actual RxRPC
+     connections are handled transparently.  One client socket may be used to
+     make multiple simultaneous calls to the same service.  One server socket
+     may handle calls from many clients.
+
+ (*) Additional parallel client connections will be initiated to support extra
+     concurrent calls, up to a tunable limit.
+
+ (*) Each connection is retained for a certain amount of time [tunable] after
+     the last call currently using it has completed in case a new call is made
+     that could reuse it.
+
+ (*) Each internal UDP socket is retained [tunable] for a certain amount of
+     time [tunable] after the last connection using it discarded, in case a new
+     connection is made that could use it.
+
+ (*) A client-side connection is only shared between calls if they have have
+     the same key struct describing their security (and assuming the calls
+     would otherwise share the connection).  Non-secured calls would also be
+     able to share connections with each other.
+
+ (*) A server-side connection is shared if the client says it is.
+
+ (*) ACK'ing is handled by the protocol driver automatically, including ping
+     replying.
+
+ (*) SO_KEEPALIVE automatically pings the other side to keep the connection
+     alive [TODO].
+
+ (*) If an ICMP error is received, all calls affected by that error will be
+     aborted with an appropriate network error passed through recvmsg().
+
+
+Interaction with the user of the RxRPC socket:
+
+ (*) A socket is made into a server socket by binding an address with a
+     non-zero service ID.
+
+ (*) In the client, sending a request is achieved with one or more sendmsgs,
+     followed by the reply being received with one or more recvmsgs.
+
+ (*) The first sendmsg for a request to be sent from a client contains a tag to
+     be used in all other sendmsgs or recvmsgs associated with that call.  The
+     tag is carried in the control data.
+
+ (*) connect() is used to supply a default destination address for a client
+     socket.  This may be overridden by supplying an alternate address to the
+     first sendmsg() of a call (struct msghdr::msg_name).
+
+ (*) If connect() is called on an unbound client, a random local port will
+     bound before the operation takes place.
+
+ (*) A server socket may also be used to make client calls.  To do this, the
+     first sendmsg() of the call must specify the target address.  The server's
+     transport endpoint is used to send the packets.
+
+ (*) Once the application has received the last message associated with a call,
+     the tag is guaranteed not to be seen again, and so it can be used to pin
+     client resources.  A new call can then be initiated with the same tag
+     without fear of interference.
+
+ (*) In the server, a request is received with one or more recvmsgs, then the
+     the reply is transmitted with one or more sendmsgs, and then the final ACK
+     is received with a last recvmsg.
+
+ (*) When sending data for a call, sendmsg is given MSG_MORE if there's more
+     data to come on that call.
+
+ (*) When receiving data for a call, recvmsg flags MSG_MORE if there's more
+     data to come for that call.
+
+ (*) When receiving data or messages for a call, MSG_EOR is flagged by recvmsg
+     to indicate the terminal message for that call.
+
+ (*) A call may be aborted by adding an abort control message to the control
+     data.  Issuing an abort terminates the kernel's use of that call's tag.
+     Any messages waiting in the receive queue for that call will be discarded.
+
+ (*) Aborts, busy notifications and challenge packets are delivered by recvmsg,
+     and control data messages will be set to indicate the context.  Receiving
+     an abort or a busy message terminates the kernel's use of that call's tag.
+
+ (*) The control data part of the msghdr struct is used for a number of things:
+
+     (*) The tag of the intended or affected call.
+
+     (*) Sending or receiving errors, aborts and busy notifications.
+
+     (*) Notifications of incoming calls.
+
+     (*) Sending debug requests and receiving debug replies [TODO].
+
+ (*) When the kernel has received and set up an incoming call, it sends a
+     message to server application to let it know there's a new call awaiting
+     its acceptance [recvmsg reports a special control message].  The server
+     application then uses sendmsg to assign a tag to the new call.  Once that
+     is done, the first part of the request data will be delivered by recvmsg.
+
+ (*) The server application has to provide the server socket with a keyring of
+     secret keys corresponding to the security types it permits.  When a secure
+     connection is being set up, the kernel looks up the appropriate secret key
+     in the keyring and then sends a challenge packet to the client and
+     receives a response packet.  The kernel then checks the authorisation of
+     the packet and either aborts the connection or sets up the security.
+
+ (*) The name of the key a client will use to secure its communications is
+     nominated by a socket option.
+
+
+Notes on recvmsg:
+
+ (*) If there's a sequence of data messages belonging to a particular call on
+     the receive queue, then recvmsg will keep working through them until:
+
+     (a) it meets the end of that call's received data,
+
+     (b) it meets a non-data message,
+
+     (c) it meets a message belonging to a different call, or
+
+     (d) it fills the user buffer.
+
+     If recvmsg is called in blocking mode, it will keep sleeping, awaiting the
+     reception of further data, until one of the above four conditions is met.
+
+ (2) MSG_PEEK operates similarly, but will return immediately if it has put any
+     data in the buffer rather than sleeping until it can fill the buffer.
+
+ (3) If a data message is only partially consumed in filling a user buffer,
+     then the remainder of that message will be left on the front of the queue
+     for the next taker.  MSG_TRUNC will never be flagged.
+
+ (4) If there is more data to be had on a call (it hasn't copied the last byte
+     of the last data message in that phase yet), then MSG_MORE will be
+     flagged.
+
+
+================
+CONTROL MESSAGES
+================
+
+AF_RXRPC makes use of control messages in sendmsg() and recvmsg() to multiplex
+calls, to invoke certain actions and to report certain conditions.  These are:
+
+	MESSAGE ID		SRT DATA	MEANING
+	=======================	=== ===========	===============================
+	RXRPC_USER_CALL_ID	sr- User ID	App's call specifier
+	RXRPC_ABORT		srt Abort code	Abort code to issue/received
+	RXRPC_ACK		-rt n/a		Final ACK received
+	RXRPC_NET_ERROR		-rt error num	Network error on call
+	RXRPC_BUSY		-rt n/a		Call rejected (server busy)
+	RXRPC_LOCAL_ERROR	-rt error num	Local error encountered
+	RXRPC_NEW_CALL		-r- n/a		New call received
+	RXRPC_ACCEPT		s-- n/a		Accept new call
+
+	(SRT = usable in Sendmsg / delivered by Recvmsg / Terminal message)
+
+ (*) RXRPC_USER_CALL_ID
+
+     This is used to indicate the application's call ID.  It's an unsigned long
+     that the app specifies in the client by attaching it to the first data
+     message or in the server by passing it in association with an RXRPC_ACCEPT
+     message.  recvmsg() passes it in conjunction with all messages except
+     those of the RXRPC_NEW_CALL message.
+
+ (*) RXRPC_ABORT
+
+     This is can be used by an application to abort a call by passing it to
+     sendmsg, or it can be delivered by recvmsg to indicate a remote abort was
+     received.  Either way, it must be associated with an RXRPC_USER_CALL_ID to
+     specify the call affected.  If an abort is being sent, then error EBADSLT
+     will be returned if there is no call with that user ID.
+
+ (*) RXRPC_ACK
+
+     This is delivered to a server application to indicate that the final ACK
+     of a call was received from the client.  It will be associated with an
+     RXRPC_USER_CALL_ID to indicate the call that's now complete.
+
+ (*) RXRPC_NET_ERROR
+
+     This is delivered to an application to indicate that an ICMP error message
+     was encountered in the process of trying to talk to the peer.  An
+     errno-class integer value will be included in the control message data
+     indicating the problem, and an RXRPC_USER_CALL_ID will indicate the call
+     affected.
+
+ (*) RXRPC_BUSY
+
+     This is delivered to a client application to indicate that a call was
+     rejected by the server due to the server being busy.  It will be
+     associated with an RXRPC_USER_CALL_ID to indicate the rejected call.
+
+ (*) RXRPC_LOCAL_ERROR
+
+     This is delivered to an application to indicate that a local error was
+     encountered and that a call has been aborted because of it.  An
+     errno-class integer value will be included in the control message data
+     indicating the problem, and an RXRPC_USER_CALL_ID will indicate the call
+     affected.
+
+ (*) RXRPC_NEW_CALL
+
+     This is delivered to indicate to a server application that a new call has
+     arrived and is awaiting acceptance.  No user ID is associated with this,
+     as a user ID must subsequently be assigned by doing an RXRPC_ACCEPT.
+
+ (*) RXRPC_ACCEPT
+
+     This is used by a server application to attempt to accept a call and
+     assign it a user ID.  It should be associated with an RXRPC_USER_CALL_ID
+     to indicate the user ID to be assigned.  If there is no call to be
+     accepted (it may have timed out, been aborted, etc.), then sendmsg will
+     return error ENODATA.  If the user ID is already in use by another call,
+     then error EBADSLT will be returned.
+
+
+==============
+SOCKET OPTIONS
+==============
+
+AF_RXRPC sockets support a few socket options at the SOL_RXRPC level:
+
+ (*) RXRPC_SECURITY_KEY
+
+     This is used to specify the description of the key to be used.  The key is
+     extracted from the calling process's keyrings with request_key() and
+     should be of "rxrpc" type.
+
+     The optval pointer points to the description string, and optlen indicates
+     how long the string is, without the NUL terminator.
+
+ (*) RXRPC_SECURITY_KEYRING
+
+     Similar to above but specifies a keyring of server secret keys to use (key
+     type "keyring").  See the "Security" section.
+
+ (*) RXRPC_EXCLUSIVE_CONNECTION
+
+     This is used to request that new connections should be used for each call
+     made subsequently on this socket.  optval should be NULL and optlen 0.
+
+ (*) RXRPC_MIN_SECURITY_LEVEL
+
+     This is used to specify the minimum security level required for calls on
+     this socket.  optval must point to an int containing one of the following
+     values:
+
+     (a) RXRPC_SECURITY_PLAIN
+
+	 Encrypted checksum only.
+
+     (b) RXRPC_SECURITY_AUTH
+
+	 Encrypted checksum plus packet padded and first eight bytes of packet
+	 encrypted - which includes the actual packet length.
+
+     (c) RXRPC_SECURITY_ENCRYPTED
+
+	 Encrypted checksum plus entire packet padded and encrypted, including
+	 actual packet length.
+
+
+========
+SECURITY
+========
+
+Currently, only the kerberos 4 equivalent protocol has been implemented
+(security index 2 - rxkad).  This requires the rxkad module to be loaded and,
+on the client, tickets of the appropriate type to be obtained from the AFS
+kaserver or the kerberos server and installed as "rxrpc" type keys.  This is
+normally done using the klog program.  An example simple klog program can be
+found at:
+
+	http://people.redhat.com/~dhowells/rxrpc/klog.c
+
+The payload provided to add_key() on the client should be of the following
+form:
+
+	struct rxrpc_key_sec2_v1 {
+		uint16_t	security_index;	/* 2 */
+		uint16_t	ticket_length;	/* length of ticket[] */
+		uint32_t	expiry;		/* time at which expires */
+		uint8_t		kvno;		/* key version number */
+		uint8_t		__pad[3];
+		uint8_t		session_key[8];	/* DES session key */
+		uint8_t		ticket[0];	/* the encrypted ticket */
+	};
+
+Where the ticket blob is just appended to the above structure.
+
+
+For the server, keys of type "rxrpc_s" must be made available to the server.
+They have a description of "<serviceID>:<securityIndex>" (eg: "52:2" for an
+rxkad key for the AFS VL service).  When such a key is created, it should be
+given the server's secret key as the instantiation data (see the example
+below).
+
+	add_key("rxrpc_s", "52:2", secret_key, 8, keyring);
+
+A keyring is passed to the server socket by naming it in a sockopt.  The server
+socket then looks the server secret keys up in this keyring when secure
+incoming connections are made.  This can be seen in an example program that can
+be found at:
+
+	http://people.redhat.com/~dhowells/rxrpc/listen.c
+
+
+====================
+EXAMPLE CLIENT USAGE
+====================
+
+A client would issue an operation by:
+
+ (1) An RxRPC socket is set up by:
+
+	client = socket(AF_RXRPC, SOCK_DGRAM, PF_INET);
+
+     Where the third parameter indicates the protocol family of the transport
+     socket used - usually IPv4 but it can also be IPv6 [TODO].
+
+ (2) A local address can optionally be bound:
+
+	struct sockaddr_rxrpc srx = {
+		.srx_family	= AF_RXRPC,
+		.srx_service	= 0,  /* we're a client */
+		.transport_type	= SOCK_DGRAM,	/* type of transport socket */
+		.transport.sin_family	= AF_INET,
+		.transport.sin_port	= htons(7000), /* AFS callback */
+		.transport.sin_address	= 0,  /* all local interfaces */
+	};
+	bind(client, &srx, sizeof(srx));
+
+     This specifies the local UDP port to be used.  If not given, a random
+     non-privileged port will be used.  A UDP port may be shared between
+     several unrelated RxRPC sockets.  Security is handled on a basis of
+     per-RxRPC virtual connection.
+
+ (3) The security is set:
+
+	const char *key = "AFS:cambridge.redhat.com";
+	setsockopt(client, SOL_RXRPC, RXRPC_SECURITY_KEY, key, strlen(key));
+
+     This issues a request_key() to get the key representing the security
+     context.  The minimum security level can be set:
+
+	unsigned int sec = RXRPC_SECURITY_ENCRYPTED;
+	setsockopt(client, SOL_RXRPC, RXRPC_MIN_SECURITY_LEVEL,
+		   &sec, sizeof(sec));
+
+ (4) The server to be contacted can then be specified (alternatively this can
+     be done through sendmsg):
+
+	struct sockaddr_rxrpc srx = {
+		.srx_family	= AF_RXRPC,
+		.srx_service	= VL_SERVICE_ID,
+		.transport_type	= SOCK_DGRAM,	/* type of transport socket */
+		.transport.sin_family	= AF_INET,
+		.transport.sin_port	= htons(7005), /* AFS volume manager */
+		.transport.sin_address	= ...,
+	};
+	connect(client, &srx, sizeof(srx));
+
+ (5) The request data should then be posted to the server socket using a series
+     of sendmsg() calls, each with the following control message attached:
+
+	RXRPC_USER_CALL_ID	- specifies the user ID for this call
+
+     MSG_MORE should be set in msghdr::msg_flags on all but the last part of
+     the request.  Multiple requests may be made simultaneously.
+
+     If a call is intended to go to a destination other then the default
+     specified through connect(), then msghdr::msg_name should be set on the
+     first request message of that call.
+
+ (6) The reply data will then be posted to the server socket for recvmsg() to
+     pick up.  MSG_MORE will be flagged by recvmsg() if there's more reply data
+     for a particular call to be read.  MSG_EOR will be set on the terminal
+     read for a call.
+
+     All data will be delivered with the following control message attached:
+
+	RXRPC_USER_CALL_ID	- specifies the user ID for this call
+
+     If an abort or error occurred, this will be returned in the control data
+     buffer instead, and MSG_EOR will be flagged to indicate the end of that
+     call.
+
+
+====================
+EXAMPLE SERVER USAGE
+====================
+
+A server would be set up to accept operations in the following manner:
+
+ (1) An RxRPC socket is created by:
+
+	server = socket(AF_RXRPC, SOCK_DGRAM, PF_INET);
+
+     Where the third parameter indicates the address type of the transport
+     socket used - usually IPv4.
+
+ (2) Security is set up if desired by giving the socket a keyring with server
+     secret keys in it:
+
+	keyring = add_key("keyring", "AFSkeys", NULL, 0,
+			  KEY_SPEC_PROCESS_KEYRING);
+
+	const char secret_key[8] = {
+		0xa7, 0x83, 0x8a, 0xcb, 0xc7, 0x83, 0xec, 0x94 };
+	add_key("rxrpc_s", "52:2", secret_key, 8, keyring);
+
+	setsockopt(server, SOL_RXRPC, RXRPC_SECURITY_KEYRING, "AFSkeys", 7);
+
+     The keyring can be manipulated after it has been given to the socket. This
+     permits the server to add more keys, replace keys, etc. whilst it is live.
+
+ (2) A local address must then be bound:
+
+	struct sockaddr_rxrpc srx = {
+		.srx_family	= AF_RXRPC,
+		.srx_service	= VL_SERVICE_ID, /* RxRPC service ID */
+		.transport_type	= SOCK_DGRAM,	/* type of transport socket */
+		.transport.sin_family	= AF_INET,
+		.transport.sin_port	= htons(7000), /* AFS callback */
+		.transport.sin_address	= 0,  /* all local interfaces */
+	};
+	bind(server, &srx, sizeof(srx));
+
+ (3) The server is then set to listen out for incoming calls:
+
+	listen(server, 100);
+
+ (4) The kernel notifies the server of pending incoming connections by sending
+     it a message for each.  This is received with recvmsg() on the server
+     socket.  It has no data, and has a single dataless control message
+     attached:
+
+	RXRPC_NEW_CALL
+
+     The address that can be passed back by recvmsg() at this point should be
+     ignored since the call for which the message was posted may have gone by
+     the time it is accepted - in which case the first call still on the queue
+     will be accepted.
+
+ (5) The server then accepts the new call by issuing a sendmsg() with two
+     pieces of control data and no actual data:
+
+	RXRPC_ACCEPT		- indicate connection acceptance
+	RXRPC_USER_CALL_ID	- specify user ID for this call
+
+ (6) The first request data packet will then be posted to the server socket for
+     recvmsg() to pick up.  At that point, the RxRPC address for the call can
+     be read from the address fields in the msghdr struct.
+
+     Subsequent request data will be posted to the server socket for recvmsg()
+     to collect as it arrives.  All but the last piece of the request data will
+     be delivered with MSG_MORE flagged.
+
+     All data will be delivered with the following control message attached:
+
+	RXRPC_USER_CALL_ID	- specifies the user ID for this call
+
+ (8) The reply data should then be posted to the server socket using a series
+     of sendmsg() calls, each with the following control messages attached:
+
+	RXRPC_USER_CALL_ID	- specifies the user ID for this call
+
+     MSG_MORE should be set in msghdr::msg_flags on all but the last message
+     for a particular call.
+
+ (9) The final ACK from the client will be posted for retrieval by recvmsg()
+     when it is received.  It will take the form of a dataless message with two
+     control messages attached:
+
+	RXRPC_USER_CALL_ID	- specifies the user ID for this call
+	RXRPC_ACK		- indicates final ACK (no data)
+
+     MSG_EOR will be flagged to indicate that this is the final message for
+     this call.
+
+(10) Up to the point the final packet of reply data is sent, the call can be
+     aborted by calling sendmsg() with a dataless message with the following
+     control messages attached:
+
+	RXRPC_USER_CALL_ID	- specifies the user ID for this call
+	RXRPC_ABORT		- indicates abort code (4 byte data)
+
+     Any packets waiting in the socket's receive queue will be discarded if
+     this is issued.
+
+Note that all the communications for a particular service take place through
+the one server socket, using control messages on sendmsg() and recvmsg() to
+determine the call affected.
diff --git a/include/keys/rxrpc-type.h b/include/keys/rxrpc-type.h
new file mode 100644
index 0000000..e2ee73a
--- /dev/null
+++ b/include/keys/rxrpc-type.h
@@ -0,0 +1,22 @@
+/* RxRPC key type
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _KEYS_RXRPC_TYPE_H
+#define _KEYS_RXRPC_TYPE_H
+
+#include <linux/key.h>
+
+/*
+ * key type for AF_RXRPC keys
+ */
+extern struct key_type key_type_rxrpc;
+
+#endif /* _KEYS_USER_TYPE_H */
diff --git a/include/linux/net.h b/include/linux/net.h
index 4db21e6..efc4517 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -24,7 +24,7 @@
 struct poll_table_struct;
 struct inode;
 
-#define NPROTO		33		/* should be enough for now..	*/
+#define NPROTO		34		/* should be enough for now..	*/
 
 #define SYS_SOCKET	1		/* sys_socket(2)		*/
 #define SYS_BIND	2		/* sys_bind(2)			*/
diff --git a/include/linux/rxrpc.h b/include/linux/rxrpc.h
new file mode 100644
index 0000000..f7b826b
--- /dev/null
+++ b/include/linux/rxrpc.h
@@ -0,0 +1,62 @@
+/* AF_RXRPC parameters
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _LINUX_RXRPC_H
+#define _LINUX_RXRPC_H
+
+#include <linux/in.h>
+#include <linux/in6.h>
+
+/*
+ * RxRPC socket address
+ */
+struct sockaddr_rxrpc {
+	sa_family_t	srx_family;	/* address family */
+	u16		srx_service;	/* service desired */
+	u16		transport_type;	/* type of transport socket (SOCK_DGRAM) */
+	u16		transport_len;	/* length of transport address */
+	union {
+		sa_family_t family;		/* transport address family */
+		struct sockaddr_in sin;		/* IPv4 transport address */
+		struct sockaddr_in6 sin6;	/* IPv6 transport address */
+	} transport;
+};
+
+/*
+ * RxRPC socket options
+ */
+#define RXRPC_SECURITY_KEY		1	/* [clnt] set client security key */
+#define RXRPC_SECURITY_KEYRING		2	/* [srvr] set ring of server security keys */
+#define RXRPC_EXCLUSIVE_CONNECTION	3	/* [clnt] use exclusive RxRPC connection */
+#define RXRPC_MIN_SECURITY_LEVEL	4	/* minimum security level */
+
+/*
+ * RxRPC control messages
+ * - terminal messages mean that a user call ID tag can be recycled
+ */
+#define RXRPC_USER_CALL_ID	1	/* user call ID specifier */
+#define RXRPC_ABORT		2	/* abort request / notification [terminal] */
+#define RXRPC_ACK		3	/* [Server] RPC op final ACK received [terminal] */
+#define RXRPC_NET_ERROR		5	/* network error received [terminal] */
+#define RXRPC_BUSY		6	/* server busy received [terminal] */
+#define RXRPC_LOCAL_ERROR	7	/* local error generated [terminal] */
+#define RXRPC_NEW_CALL		8	/* [Server] new incoming call notification */
+#define RXRPC_ACCEPT		9	/* [Server] accept request */
+
+/*
+ * RxRPC security levels
+ */
+#define RXRPC_SECURITY_PLAIN	0	/* plain secure-checksummed packets only */
+#define RXRPC_SECURITY_AUTH	1	/* authenticated packets */
+#define RXRPC_SECURITY_ENCRYPT	2	/* encrypted packets */
+
+
+#endif /* _LINUX_RXRPC_H */
diff --git a/include/linux/socket.h b/include/linux/socket.h
index fcd35a2..6e7c948 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -188,7 +188,8 @@
 #define AF_TIPC		30	/* TIPC sockets			*/
 #define AF_BLUETOOTH	31	/* Bluetooth sockets 		*/
 #define AF_IUCV		32	/* IUCV sockets			*/
-#define AF_MAX		33	/* For now.. */
+#define AF_RXRPC	33	/* RxRPC sockets 		*/
+#define AF_MAX		34	/* For now.. */
 
 /* Protocol families, same as address families. */
 #define PF_UNSPEC	AF_UNSPEC
@@ -222,6 +223,7 @@
 #define PF_TIPC		AF_TIPC
 #define PF_BLUETOOTH	AF_BLUETOOTH
 #define PF_IUCV		AF_IUCV
+#define PF_RXRPC	AF_RXRPC
 #define PF_MAX		AF_MAX
 
 /* Maximum queue length specifiable by listen.  */
@@ -284,6 +286,7 @@
 #define SOL_DCCP	269
 #define SOL_NETLINK	270
 #define SOL_TIPC	271
+#define SOL_RXRPC	272
 
 /* IPX options */
 #define IPX_TYPE	1
diff --git a/include/net/af_rxrpc.h b/include/net/af_rxrpc.h
new file mode 100644
index 0000000..b01ca25
--- /dev/null
+++ b/include/net/af_rxrpc.h
@@ -0,0 +1,17 @@
+/* RxRPC definitions
+ *
+ * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _NET_RXRPC_H
+#define _NET_RXRPC_H
+
+#include <linux/rxrpc.h>
+
+#endif /* _NET_RXRPC_H */
diff --git a/include/rxrpc/packet.h b/include/rxrpc/packet.h
index 1447f0a..452a9bb0 100644
--- a/include/rxrpc/packet.h
+++ b/include/rxrpc/packet.h
@@ -33,7 +33,8 @@
 #define RXRPC_MAXCALLS		4			/* max active calls per conn */
 #define RXRPC_CHANNELMASK	(RXRPC_MAXCALLS-1)	/* mask for channel ID */
 #define RXRPC_CIDMASK		(~RXRPC_CHANNELMASK)	/* mask for connection ID */
-#define RXRPC_CIDSHIFT		2			/* shift for connection ID */
+#define RXRPC_CIDSHIFT		ilog2(RXRPC_MAXCALLS)	/* shift for connection ID */
+#define RXRPC_CID_INC		(1 << RXRPC_CIDSHIFT)	/* connection ID increment */
 
 	__be32		callNumber;	/* call ID (0 for connection-level packets) */
 #define RXRPC_PROCESS_MAXCALLS	(1<<2)	/* maximum number of active calls per conn (power of 2) */
@@ -62,7 +63,10 @@
 
 	uint8_t		userStatus;	/* app-layer defined status */
 	uint8_t		securityIndex;	/* security protocol ID */
-	__be16		_rsvd;		/* reserved (used by kerberos security as cksum) */
+	union {
+		__be16	_rsvd;		/* reserved */
+		__be16	cksum;		/* kerberos security checksum */
+	};
 	__be16		serviceId;	/* service ID */
 
 } __attribute__((packed));
@@ -124,4 +128,81 @@
 
 } __attribute__((packed));
 
+/*
+ * ACK packets can have a further piece of information tagged on the end
+ */
+struct rxrpc_ackinfo {
+	__be32		rxMTU;		/* maximum Rx MTU size (bytes) [AFS 3.3] */
+	__be32		maxMTU;		/* maximum interface MTU size (bytes) [AFS 3.3] */
+	__be32		rwind;		/* Rx window size (packets) [AFS 3.4] */
+	__be32		jumbo_max;	/* max packets to stick into a jumbo packet [AFS 3.5] */
+};
+
+/*****************************************************************************/
+/*
+ * Kerberos security type-2 challenge packet
+ */
+struct rxkad_challenge {
+	__be32		version;	/* version of this challenge type */
+	__be32		nonce;		/* encrypted random number */
+	__be32		min_level;	/* minimum security level */
+	__be32		__padding;	/* padding to 8-byte boundary */
+} __attribute__((packed));
+
+/*****************************************************************************/
+/*
+ * Kerberos security type-2 response packet
+ */
+struct rxkad_response {
+	__be32		version;	/* version of this reponse type */
+	__be32		__pad;
+
+	/* encrypted bit of the response */
+	struct {
+		__be32		epoch;		/* current epoch */
+		__be32		cid;		/* parent connection ID */
+		__be32		checksum;	/* checksum */
+		__be32		securityIndex;	/* security type */
+		__be32		call_id[4];	/* encrypted call IDs */
+		__be32		inc_nonce;	/* challenge nonce + 1 */
+		__be32		level;		/* desired level */
+	} encrypted;
+
+	__be32		kvno;		/* Kerberos key version number */
+	__be32		ticket_len;	/* Kerberos ticket length  */
+} __attribute__((packed));
+
+/*****************************************************************************/
+/*
+ * RxRPC-level abort codes
+ */
+#define RX_CALL_DEAD		-1	/* call/conn has been inactive and is shut down */
+#define RX_INVALID_OPERATION	-2	/* invalid operation requested / attempted */
+#define RX_CALL_TIMEOUT		-3	/* call timeout exceeded */
+#define RX_EOF			-4	/* unexpected end of data on read op */
+#define RX_PROTOCOL_ERROR	-5	/* low-level protocol error */
+#define RX_USER_ABORT		-6	/* generic user abort */
+#define RX_ADDRINUSE		-7	/* UDP port in use */
+#define RX_DEBUGI_BADTYPE	-8	/* bad debugging packet type */
+
+/*
+ * Rx kerberos security abort codes
+ * - unfortunately we have no generalised security abort codes to say things
+ *   like "unsupported security", so we have to use these instead and hope the
+ *   other side understands
+ */
+#define RXKADINCONSISTENCY	19270400	/* security module structure inconsistent */
+#define RXKADPACKETSHORT	19270401	/* packet too short for security challenge */
+#define RXKADLEVELFAIL		19270402	/* security level negotiation failed */
+#define RXKADTICKETLEN		19270403	/* ticket length too short or too long */
+#define RXKADOUTOFSEQUENCE	19270404	/* packet had bad sequence number */
+#define RXKADNOAUTH		19270405	/* caller not authorised */
+#define RXKADBADKEY		19270406	/* illegal key: bad parity or weak */
+#define RXKADBADTICKET		19270407	/* security object was passed a bad ticket */
+#define RXKADUNKNOWNKEY		19270408	/* ticket contained unknown key version number */
+#define RXKADEXPIRED		19270409	/* authentication expired */
+#define RXKADSEALEDINCON	19270410	/* sealed data inconsistent */
+#define RXKADDATALEN		19270411	/* user data too long */
+#define RXKADILLEGALLEVEL	19270412	/* caller not authorised to use encrypted conns */
+
 #endif /* _LINUX_RXRPC_PACKET_H */
diff --git a/net/Kconfig b/net/Kconfig
index ae1817d..2fc8e77 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -212,6 +212,7 @@
 source "net/ax25/Kconfig"
 source "net/irda/Kconfig"
 source "net/bluetooth/Kconfig"
+source "net/rxrpc/Kconfig"
 
 config FIB_RULES
 	bool
diff --git a/net/Makefile b/net/Makefile
index 29bbe19..6b74d41 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -38,6 +38,7 @@
 obj-$(CONFIG_BT)		+= bluetooth/
 obj-$(CONFIG_SUNRPC)		+= sunrpc/
 obj-$(CONFIG_RXRPC)		+= rxrpc/
+obj-$(CONFIG_AF_RXRPC)		+= rxrpc/
 obj-$(CONFIG_ATM)		+= atm/
 obj-$(CONFIG_DECNET)		+= decnet/
 obj-$(CONFIG_ECONET)		+= econet/
diff --git a/net/core/sock.c b/net/core/sock.c
index 043bdc0..22183c2 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -154,7 +154,8 @@
   "sk_lock-21"       , "sk_lock-AF_SNA"      , "sk_lock-AF_IRDA"     ,
   "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE"  , "sk_lock-AF_LLC"      ,
   "sk_lock-27"       , "sk_lock-28"          , "sk_lock-29"          ,
-  "sk_lock-AF_TIPC"  , "sk_lock-AF_BLUETOOTH", "sk_lock-AF_MAX"
+  "sk_lock-AF_TIPC"  , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV"        ,
+  "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX"
 };
 static const char *af_family_slock_key_strings[AF_MAX+1] = {
   "slock-AF_UNSPEC", "slock-AF_UNIX"     , "slock-AF_INET"     ,
@@ -167,7 +168,8 @@
   "slock-21"       , "slock-AF_SNA"      , "slock-AF_IRDA"     ,
   "slock-AF_PPPOX" , "slock-AF_WANPIPE"  , "slock-AF_LLC"      ,
   "slock-27"       , "slock-28"          , "slock-29"          ,
-  "slock-AF_TIPC"  , "slock-AF_BLUETOOTH", "slock-AF_MAX"
+  "slock-AF_TIPC"  , "slock-AF_BLUETOOTH", "slock-AF_IUCV"     ,
+  "slock-AF_RXRPC" , "slock-AF_MAX"
 };
 #endif
 
diff --git a/net/rxrpc/Kconfig b/net/rxrpc/Kconfig
new file mode 100644
index 0000000..d72380e
--- /dev/null
+++ b/net/rxrpc/Kconfig
@@ -0,0 +1,37 @@
+#
+# RxRPC session sockets
+#
+
+config AF_RXRPC
+	tristate "RxRPC session sockets"
+	depends on EXPERIMENTAL
+	help
+	  Say Y or M here to include support for RxRPC session sockets (just
+	  the transport part, not the presentation part: (un)marshalling is
+	  left to the application).
+
+	  These are used for AFS kernel filesystem and userspace utilities.
+
+	  This module at the moment only supports client operations and is
+	  currently incomplete.
+
+	  See Documentation/networking/rxrpc.txt.
+
+
+config AF_RXRPC_DEBUG
+	bool "RxRPC dynamic debugging"
+	depends on AF_RXRPC
+	help
+	  Say Y here to make runtime controllable debugging messages appear.
+
+	  See Documentation/networking/rxrpc.txt.
+
+
+config RXKAD
+	tristate "RxRPC Kerberos security"
+	depends on AF_RXRPC && KEYS
+	help
+	  Provide kerberos 4 and AFS kaserver security handling for AF_RXRPC
+	  through the use of the key retention service.
+
+	  See Documentation/networking/rxrpc.txt.
diff --git a/net/rxrpc/Makefile b/net/rxrpc/Makefile
index 6efcb6f..07bf82f 100644
--- a/net/rxrpc/Makefile
+++ b/net/rxrpc/Makefile
@@ -4,6 +4,35 @@
 
 #CFLAGS += -finstrument-functions
 
+af-rxrpc-objs := \
+	af_rxrpc.o \
+	ar-accept.o \
+	ar-ack.o \
+	ar-call.o \
+	ar-connection.o \
+	ar-connevent.o \
+	ar-error.o \
+	ar-input.o \
+	ar-key.o \
+	ar-local.o \
+	ar-output.o \
+	ar-peer.o \
+	ar-recvmsg.o \
+	ar-security.o \
+	ar-skbuff.o \
+	ar-transport.o
+
+ifeq ($(CONFIG_PROC_FS),y)
+af-rxrpc-objs += ar-proc.o
+endif
+
+obj-$(CONFIG_AF_RXRPC) += af-rxrpc.o
+
+obj-$(CONFIG_RXKAD) += rxkad.o
+
+#
+# obsolete RxRPC interface, still used by fs/afs/
+#
 rxrpc-objs := \
 	call.o \
 	connection.o \
@@ -22,4 +51,4 @@
 rxrpc-objs += sysctl.o
 endif
 
-obj-$(CONFIG_RXRPC) := rxrpc.o
+obj-$(CONFIG_RXRPC) += rxrpc.o
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
new file mode 100644
index 0000000..bfa8822
--- /dev/null
+++ b/net/rxrpc/af_rxrpc.c
@@ -0,0 +1,754 @@
+/* AF_RXRPC implementation
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/poll.h>
+#include <linux/proc_fs.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+MODULE_DESCRIPTION("RxRPC network protocol");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_RXRPC);
+
+unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
+module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(rxrpc_debug, "RxRPC debugging mask");
+
+static int sysctl_rxrpc_max_qlen __read_mostly = 10;
+
+static struct proto rxrpc_proto;
+static const struct proto_ops rxrpc_rpc_ops;
+
+/* local epoch for detecting local-end reset */
+__be32 rxrpc_epoch;
+
+/* current debugging ID */
+atomic_t rxrpc_debug_id;
+
+/* count of skbs currently in use */
+atomic_t rxrpc_n_skbs;
+
+static void rxrpc_sock_destructor(struct sock *);
+
+/*
+ * see if an RxRPC socket is currently writable
+ */
+static inline int rxrpc_writable(struct sock *sk)
+{
+	return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
+}
+
+/*
+ * wait for write bufferage to become available
+ */
+static void rxrpc_write_space(struct sock *sk)
+{
+	_enter("%p", sk);
+	read_lock(&sk->sk_callback_lock);
+	if (rxrpc_writable(sk)) {
+		if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+			wake_up_interruptible(sk->sk_sleep);
+		sk_wake_async(sk, 2, POLL_OUT);
+	}
+	read_unlock(&sk->sk_callback_lock);
+}
+
+/*
+ * validate an RxRPC address
+ */
+static int rxrpc_validate_address(struct rxrpc_sock *rx,
+				  struct sockaddr_rxrpc *srx,
+				  int len)
+{
+	if (len < sizeof(struct sockaddr_rxrpc))
+		return -EINVAL;
+
+	if (srx->srx_family != AF_RXRPC)
+		return -EAFNOSUPPORT;
+
+	if (srx->transport_type != SOCK_DGRAM)
+		return -ESOCKTNOSUPPORT;
+
+	len -= offsetof(struct sockaddr_rxrpc, transport);
+	if (srx->transport_len < sizeof(sa_family_t) ||
+	    srx->transport_len > len)
+		return -EINVAL;
+
+	if (srx->transport.family != rx->proto)
+		return -EAFNOSUPPORT;
+
+	switch (srx->transport.family) {
+	case AF_INET:
+		_debug("INET: %x @ %u.%u.%u.%u",
+		       ntohs(srx->transport.sin.sin_port),
+		       NIPQUAD(srx->transport.sin.sin_addr));
+		if (srx->transport_len > 8)
+			memset((void *)&srx->transport + 8, 0,
+			       srx->transport_len - 8);
+		break;
+
+	case AF_INET6:
+	default:
+		return -EAFNOSUPPORT;
+	}
+
+	return 0;
+}
+
+/*
+ * bind a local address to an RxRPC socket
+ */
+static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
+{
+	struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
+	struct sock *sk = sock->sk;
+	struct rxrpc_local *local;
+	struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
+	__be16 service_id;
+	int ret;
+
+	_enter("%p,%p,%d", rx, saddr, len);
+
+	ret = rxrpc_validate_address(rx, srx, len);
+	if (ret < 0)
+		goto error;
+
+	lock_sock(&rx->sk);
+
+	if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
+		ret = -EINVAL;
+		goto error_unlock;
+	}
+
+	memcpy(&rx->srx, srx, sizeof(rx->srx));
+
+	/* find a local transport endpoint if we don't have one already */
+	local = rxrpc_lookup_local(&rx->srx);
+	if (IS_ERR(local)) {
+		ret = PTR_ERR(local);
+		goto error_unlock;
+	}
+
+	rx->local = local;
+	if (srx->srx_service) {
+		service_id = htons(srx->srx_service);
+		write_lock_bh(&local->services_lock);
+		list_for_each_entry(prx, &local->services, listen_link) {
+			if (prx->service_id == service_id)
+				goto service_in_use;
+		}
+
+		rx->service_id = service_id;
+		list_add_tail(&rx->listen_link, &local->services);
+		write_unlock_bh(&local->services_lock);
+
+		rx->sk.sk_state = RXRPC_SERVER_BOUND;
+	} else {
+		rx->sk.sk_state = RXRPC_CLIENT_BOUND;
+	}
+
+	release_sock(&rx->sk);
+	_leave(" = 0");
+	return 0;
+
+service_in_use:
+	ret = -EADDRINUSE;
+	write_unlock_bh(&local->services_lock);
+error_unlock:
+	release_sock(&rx->sk);
+error:
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * set the number of pending calls permitted on a listening socket
+ */
+static int rxrpc_listen(struct socket *sock, int backlog)
+{
+	struct sock *sk = sock->sk;
+	struct rxrpc_sock *rx = rxrpc_sk(sk);
+	int ret;
+
+	_enter("%p,%d", rx, backlog);
+
+	lock_sock(&rx->sk);
+
+	switch (rx->sk.sk_state) {
+	case RXRPC_UNCONNECTED:
+		ret = -EADDRNOTAVAIL;
+		break;
+	case RXRPC_CLIENT_BOUND:
+	case RXRPC_CLIENT_CONNECTED:
+	default:
+		ret = -EBUSY;
+		break;
+	case RXRPC_SERVER_BOUND:
+		ASSERT(rx->local != NULL);
+		sk->sk_max_ack_backlog = backlog;
+		rx->sk.sk_state = RXRPC_SERVER_LISTENING;
+		ret = 0;
+		break;
+	}
+
+	release_sock(&rx->sk);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * find a transport by address
+ */
+static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
+						       struct sockaddr *addr,
+						       int addr_len, int flags)
+{
+	struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
+	struct rxrpc_transport *trans;
+	struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+	struct rxrpc_peer *peer;
+
+	_enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
+
+	ASSERT(rx->local != NULL);
+	ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED);
+
+	if (rx->srx.transport_type != srx->transport_type)
+		return ERR_PTR(-ESOCKTNOSUPPORT);
+	if (rx->srx.transport.family != srx->transport.family)
+		return ERR_PTR(-EAFNOSUPPORT);
+
+	/* find a remote transport endpoint from the local one */
+	peer = rxrpc_get_peer(srx, GFP_KERNEL);
+	if (IS_ERR(peer))
+		return ERR_PTR(PTR_ERR(peer));
+
+	/* find a transport */
+	trans = rxrpc_get_transport(rx->local, peer, GFP_KERNEL);
+	rxrpc_put_peer(peer);
+	_leave(" = %p", trans);
+	return trans;
+}
+
+/*
+ * connect an RxRPC socket
+ * - this just targets it at a specific destination; no actual connection
+ *   negotiation takes place
+ */
+static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
+			 int addr_len, int flags)
+{
+	struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
+	struct sock *sk = sock->sk;
+	struct rxrpc_transport *trans;
+	struct rxrpc_local *local;
+	struct rxrpc_sock *rx = rxrpc_sk(sk);
+	int ret;
+
+	_enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
+
+	ret = rxrpc_validate_address(rx, srx, addr_len);
+	if (ret < 0) {
+		_leave(" = %d [bad addr]", ret);
+		return ret;
+	}
+
+	lock_sock(&rx->sk);
+
+	switch (rx->sk.sk_state) {
+	case RXRPC_UNCONNECTED:
+		/* find a local transport endpoint if we don't have one already */
+		ASSERTCMP(rx->local, ==, NULL);
+		rx->srx.srx_family = AF_RXRPC;
+		rx->srx.srx_service = 0;
+		rx->srx.transport_type = srx->transport_type;
+		rx->srx.transport_len = sizeof(sa_family_t);
+		rx->srx.transport.family = srx->transport.family;
+		local = rxrpc_lookup_local(&rx->srx);
+		if (IS_ERR(local)) {
+			release_sock(&rx->sk);
+			return PTR_ERR(local);
+		}
+		rx->local = local;
+		rx->sk.sk_state = RXRPC_CLIENT_BOUND;
+	case RXRPC_CLIENT_BOUND:
+		break;
+	case RXRPC_CLIENT_CONNECTED:
+		release_sock(&rx->sk);
+		return -EISCONN;
+	default:
+		release_sock(&rx->sk);
+		return -EBUSY; /* server sockets can't connect as well */
+	}
+
+	trans = rxrpc_name_to_transport(sock, addr, addr_len, flags);
+	if (IS_ERR(trans)) {
+		release_sock(&rx->sk);
+		_leave(" = %ld", PTR_ERR(trans));
+		return PTR_ERR(trans);
+	}
+
+	rx->trans = trans;
+	rx->service_id = htons(srx->srx_service);
+	rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
+
+	release_sock(&rx->sk);
+	return 0;
+}
+
+/*
+ * send a message through an RxRPC socket
+ * - in a client this does a number of things:
+ *   - finds/sets up a connection for the security specified (if any)
+ *   - initiates a call (ID in control data)
+ *   - ends the request phase of a call (if MSG_MORE is not set)
+ *   - sends a call data packet
+ *   - may send an abort (abort code in control data)
+ */
+static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
+			 struct msghdr *m, size_t len)
+{
+	struct rxrpc_transport *trans;
+	struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+	int ret;
+
+	_enter(",{%d},,%zu", rx->sk.sk_state, len);
+
+	if (m->msg_flags & MSG_OOB)
+		return -EOPNOTSUPP;
+
+	if (m->msg_name) {
+		ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
+		if (ret < 0) {
+			_leave(" = %d [bad addr]", ret);
+			return ret;
+		}
+	}
+
+	trans = NULL;
+	lock_sock(&rx->sk);
+
+	if (m->msg_name) {
+		ret = -EISCONN;
+		trans = rxrpc_name_to_transport(sock, m->msg_name,
+						m->msg_namelen, 0);
+		if (IS_ERR(trans)) {
+			ret = PTR_ERR(trans);
+			trans = NULL;
+			goto out;
+		}
+	} else {
+		trans = rx->trans;
+		if (trans)
+			atomic_inc(&trans->usage);
+	}
+
+	switch (rx->sk.sk_state) {
+	case RXRPC_SERVER_LISTENING:
+		if (!m->msg_name) {
+			ret = rxrpc_server_sendmsg(iocb, rx, m, len);
+			break;
+		}
+	case RXRPC_SERVER_BOUND:
+	case RXRPC_CLIENT_BOUND:
+		if (!m->msg_name) {
+			ret = -ENOTCONN;
+			break;
+		}
+	case RXRPC_CLIENT_CONNECTED:
+		ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
+		break;
+	default:
+		ret = -ENOTCONN;
+		break;
+	}
+
+out:
+	release_sock(&rx->sk);
+	if (trans)
+		rxrpc_put_transport(trans);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * set RxRPC socket options
+ */
+static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
+			    char __user *optval, int optlen)
+{
+	struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+	unsigned min_sec_level;
+	int ret;
+
+	_enter(",%d,%d,,%d", level, optname, optlen);
+
+	lock_sock(&rx->sk);
+	ret = -EOPNOTSUPP;
+
+	if (level == SOL_RXRPC) {
+		switch (optname) {
+		case RXRPC_EXCLUSIVE_CONNECTION:
+			ret = -EINVAL;
+			if (optlen != 0)
+				goto error;
+			ret = -EISCONN;
+			if (rx->sk.sk_state != RXRPC_UNCONNECTED)
+				goto error;
+			set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
+			goto success;
+
+		case RXRPC_SECURITY_KEY:
+			ret = -EINVAL;
+			if (rx->key)
+				goto error;
+			ret = -EISCONN;
+			if (rx->sk.sk_state != RXRPC_UNCONNECTED)
+				goto error;
+			ret = rxrpc_request_key(rx, optval, optlen);
+			goto error;
+
+		case RXRPC_SECURITY_KEYRING:
+			ret = -EINVAL;
+			if (rx->key)
+				goto error;
+			ret = -EISCONN;
+			if (rx->sk.sk_state != RXRPC_UNCONNECTED)
+				goto error;
+			ret = rxrpc_server_keyring(rx, optval, optlen);
+			goto error;
+
+		case RXRPC_MIN_SECURITY_LEVEL:
+			ret = -EINVAL;
+			if (optlen != sizeof(unsigned))
+				goto error;
+			ret = -EISCONN;
+			if (rx->sk.sk_state != RXRPC_UNCONNECTED)
+				goto error;
+			ret = get_user(min_sec_level,
+				       (unsigned __user *) optval);
+			if (ret < 0)
+				goto error;
+			ret = -EINVAL;
+			if (min_sec_level > RXRPC_SECURITY_MAX)
+				goto error;
+			rx->min_sec_level = min_sec_level;
+			goto success;
+
+		default:
+			break;
+		}
+	}
+
+success:
+	ret = 0;
+error:
+	release_sock(&rx->sk);
+	return ret;
+}
+
+/*
+ * permit an RxRPC socket to be polled
+ */
+static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
+			       poll_table *wait)
+{
+	unsigned int mask;
+	struct sock *sk = sock->sk;
+
+	poll_wait(file, sk->sk_sleep, wait);
+	mask = 0;
+
+	/* the socket is readable if there are any messages waiting on the Rx
+	 * queue */
+	if (!skb_queue_empty(&sk->sk_receive_queue))
+		mask |= POLLIN | POLLRDNORM;
+
+	/* the socket is writable if there is space to add new data to the
+	 * socket; there is no guarantee that any particular call in progress
+	 * on the socket may have space in the Tx ACK window */
+	if (rxrpc_writable(sk))
+		mask |= POLLOUT | POLLWRNORM;
+
+	return mask;
+}
+
+/*
+ * create an RxRPC socket
+ */
+static int rxrpc_create(struct socket *sock, int protocol)
+{
+	struct rxrpc_sock *rx;
+	struct sock *sk;
+
+	_enter("%p,%d", sock, protocol);
+
+	/* we support transport protocol UDP only */
+	if (protocol != PF_INET)
+		return -EPROTONOSUPPORT;
+
+	if (sock->type != SOCK_DGRAM)
+		return -ESOCKTNOSUPPORT;
+
+	sock->ops = &rxrpc_rpc_ops;
+	sock->state = SS_UNCONNECTED;
+
+	sk = sk_alloc(PF_RXRPC, GFP_KERNEL, &rxrpc_proto, 1);
+	if (!sk)
+		return -ENOMEM;
+
+	sock_init_data(sock, sk);
+	sk->sk_state		= RXRPC_UNCONNECTED;
+	sk->sk_write_space	= rxrpc_write_space;
+	sk->sk_max_ack_backlog	= sysctl_rxrpc_max_qlen;
+	sk->sk_destruct		= rxrpc_sock_destructor;
+
+	rx = rxrpc_sk(sk);
+	rx->proto = protocol;
+	rx->calls = RB_ROOT;
+
+	INIT_LIST_HEAD(&rx->listen_link);
+	INIT_LIST_HEAD(&rx->secureq);
+	INIT_LIST_HEAD(&rx->acceptq);
+	rwlock_init(&rx->call_lock);
+	memset(&rx->srx, 0, sizeof(rx->srx));
+
+	_leave(" = 0 [%p]", rx);
+	return 0;
+}
+
+/*
+ * RxRPC socket destructor
+ */
+static void rxrpc_sock_destructor(struct sock *sk)
+{
+	_enter("%p", sk);
+
+	rxrpc_purge_queue(&sk->sk_receive_queue);
+
+	BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
+	BUG_TRAP(sk_unhashed(sk));
+	BUG_TRAP(!sk->sk_socket);
+
+	if (!sock_flag(sk, SOCK_DEAD)) {
+		printk("Attempt to release alive rxrpc socket: %p\n", sk);
+		return;
+	}
+}
+
+/*
+ * release an RxRPC socket
+ */
+static int rxrpc_release_sock(struct sock *sk)
+{
+	struct rxrpc_sock *rx = rxrpc_sk(sk);
+
+	_enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
+
+	/* declare the socket closed for business */
+	sock_orphan(sk);
+	sk->sk_shutdown = SHUTDOWN_MASK;
+
+	spin_lock_bh(&sk->sk_receive_queue.lock);
+	sk->sk_state = RXRPC_CLOSE;
+	spin_unlock_bh(&sk->sk_receive_queue.lock);
+
+	ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
+
+	if (!list_empty(&rx->listen_link)) {
+		write_lock_bh(&rx->local->services_lock);
+		list_del(&rx->listen_link);
+		write_unlock_bh(&rx->local->services_lock);
+	}
+
+	/* try to flush out this socket */
+	rxrpc_release_calls_on_socket(rx);
+	flush_scheduled_work();
+	rxrpc_purge_queue(&sk->sk_receive_queue);
+
+	if (rx->conn) {
+		rxrpc_put_connection(rx->conn);
+		rx->conn = NULL;
+	}
+
+	if (rx->bundle) {
+		rxrpc_put_bundle(rx->trans, rx->bundle);
+		rx->bundle = NULL;
+	}
+	if (rx->trans) {
+		rxrpc_put_transport(rx->trans);
+		rx->trans = NULL;
+	}
+	if (rx->local) {
+		rxrpc_put_local(rx->local);
+		rx->local = NULL;
+	}
+
+	key_put(rx->key);
+	rx->key = NULL;
+	key_put(rx->securities);
+	rx->securities = NULL;
+	sock_put(sk);
+
+	_leave(" = 0");
+	return 0;
+}
+
+/*
+ * release an RxRPC BSD socket on close() or equivalent
+ */
+static int rxrpc_release(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	_enter("%p{%p}", sock, sk);
+
+	if (!sk)
+		return 0;
+
+	sock->sk = NULL;
+
+	return rxrpc_release_sock(sk);
+}
+
+/*
+ * RxRPC network protocol
+ */
+static const struct proto_ops rxrpc_rpc_ops = {
+	.family		= PF_UNIX,
+	.owner		= THIS_MODULE,
+	.release	= rxrpc_release,
+	.bind		= rxrpc_bind,
+	.connect	= rxrpc_connect,
+	.socketpair	= sock_no_socketpair,
+	.accept		= sock_no_accept,
+	.getname	= sock_no_getname,
+	.poll		= rxrpc_poll,
+	.ioctl		= sock_no_ioctl,
+	.listen		= rxrpc_listen,
+	.shutdown	= sock_no_shutdown,
+	.setsockopt	= rxrpc_setsockopt,
+	.getsockopt	= sock_no_getsockopt,
+	.sendmsg	= rxrpc_sendmsg,
+	.recvmsg	= rxrpc_recvmsg,
+	.mmap		= sock_no_mmap,
+	.sendpage	= sock_no_sendpage,
+};
+
+static struct proto rxrpc_proto = {
+	.name		= "RXRPC",
+	.owner		= THIS_MODULE,
+	.obj_size	= sizeof(struct rxrpc_sock),
+	.max_header	= sizeof(struct rxrpc_header),
+};
+
+static struct net_proto_family rxrpc_family_ops = {
+	.family	= PF_RXRPC,
+	.create = rxrpc_create,
+	.owner	= THIS_MODULE,
+};
+
+/*
+ * initialise and register the RxRPC protocol
+ */
+static int __init af_rxrpc_init(void)
+{
+	struct sk_buff *dummy_skb;
+	int ret = -1;
+
+	BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb));
+
+	rxrpc_epoch = htonl(xtime.tv_sec);
+
+	rxrpc_call_jar = kmem_cache_create(
+		"rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
+		SLAB_HWCACHE_ALIGN, NULL, NULL);
+	if (!rxrpc_call_jar) {
+		printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
+		ret = -ENOMEM;
+		goto error_call_jar;
+	}
+
+	ret = proto_register(&rxrpc_proto, 1);
+        if (ret < 0) {
+                printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
+		goto error_proto;
+	}
+
+	ret = sock_register(&rxrpc_family_ops);
+	if (ret < 0) {
+                printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
+		goto error_sock;
+	}
+
+	ret = register_key_type(&key_type_rxrpc);
+	if (ret < 0) {
+                printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
+		goto error_key_type;
+	}
+
+	ret = register_key_type(&key_type_rxrpc_s);
+	if (ret < 0) {
+                printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
+		goto error_key_type_s;
+	}
+
+#ifdef CONFIG_PROC_FS
+	proc_net_fops_create("rxrpc_calls", 0, &rxrpc_call_seq_fops);
+	proc_net_fops_create("rxrpc_conns", 0, &rxrpc_connection_seq_fops);
+#endif
+	return 0;
+
+error_key_type_s:
+	unregister_key_type(&key_type_rxrpc);
+error_key_type:
+	sock_unregister(PF_RXRPC);
+error_sock:
+	proto_unregister(&rxrpc_proto);
+error_proto:
+	kmem_cache_destroy(rxrpc_call_jar);
+error_call_jar:
+	return ret;
+}
+
+/*
+ * unregister the RxRPC protocol
+ */
+static void __exit af_rxrpc_exit(void)
+{
+	_enter("");
+	unregister_key_type(&key_type_rxrpc_s);
+	unregister_key_type(&key_type_rxrpc);
+	sock_unregister(PF_RXRPC);
+	proto_unregister(&rxrpc_proto);
+	rxrpc_destroy_all_calls();
+	rxrpc_destroy_all_connections();
+	rxrpc_destroy_all_transports();
+	rxrpc_destroy_all_peers();
+	rxrpc_destroy_all_locals();
+
+	ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
+
+	_debug("flush scheduled work");
+	flush_scheduled_work();
+	proc_net_remove("rxrpc_conns");
+	proc_net_remove("rxrpc_calls");
+	kmem_cache_destroy(rxrpc_call_jar);
+	_leave("");
+}
+
+module_init(af_rxrpc_init);
+module_exit(af_rxrpc_exit);
diff --git a/net/rxrpc/ar-accept.c b/net/rxrpc/ar-accept.c
new file mode 100644
index 0000000..e7af780
--- /dev/null
+++ b/net/rxrpc/ar-accept.c
@@ -0,0 +1,399 @@
+/* incoming call handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+/*
+ * generate a connection-level abort
+ */
+static int rxrpc_busy(struct rxrpc_local *local, struct sockaddr_rxrpc *srx,
+		      struct rxrpc_header *hdr)
+{
+	struct msghdr msg;
+	struct kvec iov[1];
+	size_t len;
+	int ret;
+
+	_enter("%d,,", local->debug_id);
+
+	msg.msg_name	= &srx->transport.sin;
+	msg.msg_namelen	= sizeof(srx->transport.sin);
+	msg.msg_control	= NULL;
+	msg.msg_controllen = 0;
+	msg.msg_flags	= 0;
+
+	hdr->seq	= 0;
+	hdr->type	= RXRPC_PACKET_TYPE_BUSY;
+	hdr->flags	= 0;
+	hdr->userStatus	= 0;
+	hdr->_rsvd	= 0;
+
+	iov[0].iov_base	= hdr;
+	iov[0].iov_len	= sizeof(*hdr);
+
+	len = iov[0].iov_len;
+
+	hdr->serial = htonl(1);
+	_proto("Tx BUSY %%%u", ntohl(hdr->serial));
+
+	ret = kernel_sendmsg(local->socket, &msg, iov, 1, len);
+	if (ret < 0) {
+		_leave(" = -EAGAIN [sendmsg failed: %d]", ret);
+		return -EAGAIN;
+	}
+
+	_leave(" = 0");
+	return 0;
+}
+
+/*
+ * accept an incoming call that needs peer, transport and/or connection setting
+ * up
+ */
+static int rxrpc_accept_incoming_call(struct rxrpc_local *local,
+				      struct rxrpc_sock *rx,
+				      struct sk_buff *skb,
+				      struct sockaddr_rxrpc *srx)
+{
+	struct rxrpc_connection *conn;
+	struct rxrpc_transport *trans;
+	struct rxrpc_skb_priv *sp, *nsp;
+	struct rxrpc_peer *peer;
+	struct rxrpc_call *call;
+	struct sk_buff *notification;
+	int ret;
+
+	_enter("");
+
+	sp = rxrpc_skb(skb);
+
+	/* get a notification message to send to the server app */
+	notification = alloc_skb(0, GFP_NOFS);
+	rxrpc_new_skb(notification);
+	notification->mark = RXRPC_SKB_MARK_NEW_CALL;
+
+	peer = rxrpc_get_peer(srx, GFP_NOIO);
+	if (IS_ERR(peer)) {
+		_debug("no peer");
+		ret = -EBUSY;
+		goto error;
+	}
+
+	trans = rxrpc_get_transport(local, peer, GFP_NOIO);
+	rxrpc_put_peer(peer);
+	if (!trans) {
+		_debug("no trans");
+		ret = -EBUSY;
+		goto error;
+	}
+
+	conn = rxrpc_incoming_connection(trans, &sp->hdr, GFP_NOIO);
+	rxrpc_put_transport(trans);
+	if (IS_ERR(conn)) {
+		_debug("no conn");
+		ret = PTR_ERR(conn);
+		goto error;
+	}
+
+	call = rxrpc_incoming_call(rx, conn, &sp->hdr, GFP_NOIO);
+	rxrpc_put_connection(conn);
+	if (IS_ERR(call)) {
+		_debug("no call");
+		ret = PTR_ERR(call);
+		goto error;
+	}
+
+	/* attach the call to the socket */
+	read_lock_bh(&local->services_lock);
+	if (rx->sk.sk_state == RXRPC_CLOSE)
+		goto invalid_service;
+
+	write_lock(&rx->call_lock);
+	if (!test_and_set_bit(RXRPC_CALL_INIT_ACCEPT, &call->flags)) {
+		rxrpc_get_call(call);
+
+		spin_lock(&call->conn->state_lock);
+		if (sp->hdr.securityIndex > 0 &&
+		    call->conn->state == RXRPC_CONN_SERVER_UNSECURED) {
+			_debug("await conn sec");
+			list_add_tail(&call->accept_link, &rx->secureq);
+			call->conn->state = RXRPC_CONN_SERVER_CHALLENGING;
+			atomic_inc(&call->conn->usage);
+			set_bit(RXRPC_CONN_CHALLENGE, &call->conn->events);
+			schedule_work(&call->conn->processor);
+		} else {
+			_debug("conn ready");
+			call->state = RXRPC_CALL_SERVER_ACCEPTING;
+			list_add_tail(&call->accept_link, &rx->acceptq);
+			rxrpc_get_call(call);
+			nsp = rxrpc_skb(notification);
+			nsp->call = call;
+
+			ASSERTCMP(atomic_read(&call->usage), >=, 3);
+
+			_debug("notify");
+			spin_lock(&call->lock);
+			ret = rxrpc_queue_rcv_skb(call, notification, true,
+						  false);
+			spin_unlock(&call->lock);
+			notification = NULL;
+			if (ret < 0)
+				BUG();
+		}
+		spin_unlock(&call->conn->state_lock);
+
+		_debug("queued");
+	}
+	write_unlock(&rx->call_lock);
+
+	_debug("process");
+	rxrpc_fast_process_packet(call, skb);
+
+	_debug("done");
+	read_unlock_bh(&local->services_lock);
+	rxrpc_free_skb(notification);
+	rxrpc_put_call(call);
+	_leave(" = 0");
+	return 0;
+
+invalid_service:
+	_debug("invalid");
+	read_unlock_bh(&local->services_lock);
+
+	read_lock_bh(&call->state_lock);
+	if (!test_bit(RXRPC_CALL_RELEASE, &call->flags) &&
+	    !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) {
+		rxrpc_get_call(call);
+		schedule_work(&call->processor);
+	}
+	read_unlock_bh(&call->state_lock);
+	rxrpc_put_call(call);
+	ret = -ECONNREFUSED;
+error:
+	rxrpc_free_skb(notification);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * accept incoming calls that need peer, transport and/or connection setting up
+ * - the packets we get are all incoming client DATA packets that have seq == 1
+ */
+void rxrpc_accept_incoming_calls(struct work_struct *work)
+{
+	struct rxrpc_local *local =
+		container_of(work, struct rxrpc_local, acceptor);
+	struct rxrpc_skb_priv *sp;
+	struct sockaddr_rxrpc srx;
+	struct rxrpc_sock *rx;
+	struct sk_buff *skb;
+	__be16 service_id;
+	int ret;
+
+	_enter("%d", local->debug_id);
+
+	read_lock_bh(&rxrpc_local_lock);
+	if (atomic_read(&local->usage) > 0)
+		rxrpc_get_local(local);
+	else
+		local = NULL;
+	read_unlock_bh(&rxrpc_local_lock);
+	if (!local) {
+		_leave(" [local dead]");
+		return;
+	}
+
+process_next_packet:
+	skb = skb_dequeue(&local->accept_queue);
+	if (!skb) {
+		rxrpc_put_local(local);
+		_leave("\n");
+		return;
+	}
+
+	_net("incoming call skb %p", skb);
+
+	sp = rxrpc_skb(skb);
+
+	/* determine the remote address */
+	memset(&srx, 0, sizeof(srx));
+	srx.srx_family = AF_RXRPC;
+	srx.transport.family = local->srx.transport.family;
+	srx.transport_type = local->srx.transport_type;
+	switch (srx.transport.family) {
+	case AF_INET:
+		srx.transport_len = sizeof(struct sockaddr_in);
+		srx.transport.sin.sin_port = udp_hdr(skb)->source;
+		srx.transport.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
+		break;
+	default:
+		goto busy;
+	}
+
+	/* get the socket providing the service */
+	service_id = sp->hdr.serviceId;
+	read_lock_bh(&local->services_lock);
+	list_for_each_entry(rx, &local->services, listen_link) {
+		if (rx->service_id == service_id &&
+		    rx->sk.sk_state != RXRPC_CLOSE)
+			goto found_service;
+	}
+	read_unlock_bh(&local->services_lock);
+	goto invalid_service;
+
+found_service:
+	_debug("found service %hd", ntohs(rx->service_id));
+	if (sk_acceptq_is_full(&rx->sk))
+		goto backlog_full;
+	sk_acceptq_added(&rx->sk);
+	sock_hold(&rx->sk);
+	read_unlock_bh(&local->services_lock);
+
+	ret = rxrpc_accept_incoming_call(local, rx, skb, &srx);
+	if (ret < 0)
+		sk_acceptq_removed(&rx->sk);
+	sock_put(&rx->sk);
+	switch (ret) {
+	case -ECONNRESET: /* old calls are ignored */
+	case -ECONNABORTED: /* aborted calls are reaborted or ignored */
+	case 0:
+		goto process_next_packet;
+	case -ECONNREFUSED:
+		goto invalid_service;
+	case -EBUSY:
+		goto busy;
+	case -EKEYREJECTED:
+		goto security_mismatch;
+	default:
+		BUG();
+	}
+
+backlog_full:
+	read_unlock_bh(&local->services_lock);
+busy:
+	rxrpc_busy(local, &srx, &sp->hdr);
+	rxrpc_free_skb(skb);
+	goto process_next_packet;
+
+invalid_service:
+	skb->priority = RX_INVALID_OPERATION;
+	rxrpc_reject_packet(local, skb);
+	goto process_next_packet;
+
+	/* can't change connection security type mid-flow */
+security_mismatch:
+	skb->priority = RX_PROTOCOL_ERROR;
+	rxrpc_reject_packet(local, skb);
+	goto process_next_packet;
+}
+
+/*
+ * handle acceptance of a call by userspace
+ * - assign the user call ID to the call at the front of the queue
+ */
+int rxrpc_accept_call(struct rxrpc_sock *rx, unsigned long user_call_ID)
+{
+	struct rxrpc_call *call;
+	struct rb_node *parent, **pp;
+	int ret;
+
+	_enter(",%lx", user_call_ID);
+
+	ASSERT(!irqs_disabled());
+
+	write_lock(&rx->call_lock);
+
+	ret = -ENODATA;
+	if (list_empty(&rx->acceptq))
+		goto out;
+
+	/* check the user ID isn't already in use */
+	ret = -EBADSLT;
+	pp = &rx->calls.rb_node;
+	parent = NULL;
+	while (*pp) {
+		parent = *pp;
+		call = rb_entry(parent, struct rxrpc_call, sock_node);
+
+		if (user_call_ID < call->user_call_ID)
+			pp = &(*pp)->rb_left;
+		else if (user_call_ID > call->user_call_ID)
+			pp = &(*pp)->rb_right;
+		else
+			goto out;
+	}
+
+	/* dequeue the first call and check it's still valid */
+	call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link);
+	list_del_init(&call->accept_link);
+	sk_acceptq_removed(&rx->sk);
+
+	write_lock_bh(&call->state_lock);
+	switch (call->state) {
+	case RXRPC_CALL_SERVER_ACCEPTING:
+		call->state = RXRPC_CALL_SERVER_RECV_REQUEST;
+		break;
+	case RXRPC_CALL_REMOTELY_ABORTED:
+	case RXRPC_CALL_LOCALLY_ABORTED:
+		ret = -ECONNABORTED;
+		goto out_release;
+	case RXRPC_CALL_NETWORK_ERROR:
+		ret = call->conn->error;
+		goto out_release;
+	case RXRPC_CALL_DEAD:
+		ret = -ETIME;
+		goto out_discard;
+	default:
+		BUG();
+	}
+
+	/* formalise the acceptance */
+	call->user_call_ID = user_call_ID;
+	rb_link_node(&call->sock_node, parent, pp);
+	rb_insert_color(&call->sock_node, &rx->calls);
+	if (test_and_set_bit(RXRPC_CALL_HAS_USERID, &call->flags))
+		BUG();
+	if (test_and_set_bit(RXRPC_CALL_ACCEPTED, &call->events))
+		BUG();
+	schedule_work(&call->processor);
+
+	write_unlock_bh(&call->state_lock);
+	write_unlock(&rx->call_lock);
+	_leave(" = 0");
+	return 0;
+
+	/* if the call is already dying or dead, then we leave the socket's ref
+	 * on it to be released by rxrpc_dead_call_expired() as induced by
+	 * rxrpc_release_call() */
+out_release:
+	_debug("release %p", call);
+	if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+	    !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
+		schedule_work(&call->processor);
+out_discard:
+	write_unlock_bh(&call->state_lock);
+	_debug("discard %p", call);
+out:
+	write_unlock(&rx->call_lock);
+	_leave(" = %d", ret);
+	return ret;
+}
diff --git a/net/rxrpc/ar-ack.c b/net/rxrpc/ar-ack.c
new file mode 100644
index 0000000..8f7764e
--- /dev/null
+++ b/net/rxrpc/ar-ack.c
@@ -0,0 +1,1250 @@
+/* Management of Tx window, Tx resend, ACKs and out-of-sequence reception
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/circ_buf.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/udp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+static unsigned rxrpc_ack_defer = 1;
+
+static const char *rxrpc_acks[] = {
+	"---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY", "IDL",
+	"-?-"
+};
+
+static const s8 rxrpc_ack_priority[] = {
+	[0]				= 0,
+	[RXRPC_ACK_DELAY]		= 1,
+	[RXRPC_ACK_REQUESTED]		= 2,
+	[RXRPC_ACK_IDLE]		= 3,
+	[RXRPC_ACK_PING_RESPONSE]	= 4,
+	[RXRPC_ACK_DUPLICATE]		= 5,
+	[RXRPC_ACK_OUT_OF_SEQUENCE]	= 6,
+	[RXRPC_ACK_EXCEEDS_WINDOW]	= 7,
+	[RXRPC_ACK_NOSPACE]		= 8,
+};
+
+/*
+ * propose an ACK be sent
+ */
+void __rxrpc_propose_ACK(struct rxrpc_call *call, uint8_t ack_reason,
+			 __be32 serial, bool immediate)
+{
+	unsigned long expiry;
+	s8 prior = rxrpc_ack_priority[ack_reason];
+
+	ASSERTCMP(prior, >, 0);
+
+	_enter("{%d},%s,%%%x,%u",
+	       call->debug_id, rxrpc_acks[ack_reason], ntohl(serial),
+	       immediate);
+
+	if (prior < rxrpc_ack_priority[call->ackr_reason]) {
+		if (immediate)
+			goto cancel_timer;
+		return;
+	}
+
+	/* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial
+	 * numbers */
+	if (prior == rxrpc_ack_priority[call->ackr_reason]) {
+		if (prior <= 4)
+			call->ackr_serial = serial;
+		if (immediate)
+			goto cancel_timer;
+		return;
+	}
+
+	call->ackr_reason = ack_reason;
+	call->ackr_serial = serial;
+
+	switch (ack_reason) {
+	case RXRPC_ACK_DELAY:
+		_debug("run delay timer");
+		call->ack_timer.expires = jiffies + rxrpc_ack_timeout * HZ;
+		add_timer(&call->ack_timer);
+		return;
+
+	case RXRPC_ACK_IDLE:
+		if (!immediate) {
+			_debug("run defer timer");
+			expiry = 1;
+			goto run_timer;
+		}
+		goto cancel_timer;
+
+	case RXRPC_ACK_REQUESTED:
+		if (!rxrpc_ack_defer)
+			goto cancel_timer;
+		if (!immediate || serial == cpu_to_be32(1)) {
+			_debug("run defer timer");
+			expiry = rxrpc_ack_defer;
+			goto run_timer;
+		}
+
+	default:
+		_debug("immediate ACK");
+		goto cancel_timer;
+	}
+
+run_timer:
+	expiry += jiffies;
+	if (!timer_pending(&call->ack_timer) ||
+	    time_after(call->ack_timer.expires, expiry))
+		mod_timer(&call->ack_timer, expiry);
+	return;
+
+cancel_timer:
+	_debug("cancel timer %%%u", ntohl(serial));
+	try_to_del_timer_sync(&call->ack_timer);
+	read_lock_bh(&call->state_lock);
+	if (call->state <= RXRPC_CALL_COMPLETE &&
+	    !test_and_set_bit(RXRPC_CALL_ACK, &call->events))
+		schedule_work(&call->processor);
+	read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * propose an ACK be sent, locking the call structure
+ */
+void rxrpc_propose_ACK(struct rxrpc_call *call, uint8_t ack_reason,
+		       __be32 serial, bool immediate)
+{
+	s8 prior = rxrpc_ack_priority[ack_reason];
+
+	if (prior > rxrpc_ack_priority[call->ackr_reason]) {
+		spin_lock_bh(&call->lock);
+		__rxrpc_propose_ACK(call, ack_reason, serial, immediate);
+		spin_unlock_bh(&call->lock);
+	}
+}
+
+/*
+ * set the resend timer
+ */
+static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend,
+			     unsigned long resend_at)
+{
+	read_lock_bh(&call->state_lock);
+	if (call->state >= RXRPC_CALL_COMPLETE)
+		resend = 0;
+
+	if (resend & 1) {
+		_debug("SET RESEND");
+		set_bit(RXRPC_CALL_RESEND, &call->events);
+	}
+
+	if (resend & 2) {
+		_debug("MODIFY RESEND TIMER");
+		set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+		mod_timer(&call->resend_timer, resend_at);
+	} else {
+		_debug("KILL RESEND TIMER");
+		del_timer_sync(&call->resend_timer);
+		clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
+		clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+	}
+	read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * resend packets
+ */
+static void rxrpc_resend(struct rxrpc_call *call)
+{
+	struct rxrpc_skb_priv *sp;
+	struct rxrpc_header *hdr;
+	struct sk_buff *txb;
+	unsigned long *p_txb, resend_at;
+	int loop, stop;
+	u8 resend;
+
+	_enter("{%d,%d,%d,%d},",
+	       call->acks_hard, call->acks_unacked,
+	       atomic_read(&call->sequence),
+	       CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz));
+
+	stop = 0;
+	resend = 0;
+	resend_at = 0;
+
+	for (loop = call->acks_tail;
+	     loop != call->acks_head || stop;
+	     loop = (loop + 1) &  (call->acks_winsz - 1)
+	     ) {
+		p_txb = call->acks_window + loop;
+		smp_read_barrier_depends();
+		if (*p_txb & 1)
+			continue;
+
+		txb = (struct sk_buff *) *p_txb;
+		sp = rxrpc_skb(txb);
+
+		if (sp->need_resend) {
+			sp->need_resend = 0;
+
+			/* each Tx packet has a new serial number */
+			sp->hdr.serial =
+				htonl(atomic_inc_return(&call->conn->serial));
+
+			hdr = (struct rxrpc_header *) txb->head;
+			hdr->serial = sp->hdr.serial;
+
+			_proto("Tx DATA %%%u { #%d }",
+			       ntohl(sp->hdr.serial), ntohl(sp->hdr.seq));
+			if (rxrpc_send_packet(call->conn->trans, txb) < 0) {
+				stop = 0;
+				sp->resend_at = jiffies + 3;
+			} else {
+				sp->resend_at =
+					jiffies + rxrpc_resend_timeout * HZ;
+			}
+		}
+
+		if (time_after_eq(jiffies + 1, sp->resend_at)) {
+			sp->need_resend = 1;
+			resend |= 1;
+		} else if (resend & 2) {
+			if (time_before(sp->resend_at, resend_at))
+				resend_at = sp->resend_at;
+		} else {
+			resend_at = sp->resend_at;
+			resend |= 2;
+		}
+	}
+
+	rxrpc_set_resend(call, resend, resend_at);
+	_leave("");
+}
+
+/*
+ * handle resend timer expiry
+ */
+static void rxrpc_resend_timer(struct rxrpc_call *call)
+{
+	struct rxrpc_skb_priv *sp;
+	struct sk_buff *txb;
+	unsigned long *p_txb, resend_at;
+	int loop;
+	u8 resend;
+
+	_enter("%d,%d,%d",
+	       call->acks_tail, call->acks_unacked, call->acks_head);
+
+	resend = 0;
+	resend_at = 0;
+
+	for (loop = call->acks_unacked;
+	     loop != call->acks_head;
+	     loop = (loop + 1) &  (call->acks_winsz - 1)
+	     ) {
+		p_txb = call->acks_window + loop;
+		smp_read_barrier_depends();
+		txb = (struct sk_buff *) (*p_txb & ~1);
+		sp = rxrpc_skb(txb);
+
+		ASSERT(!(*p_txb & 1));
+
+		if (sp->need_resend) {
+			;
+		} else if (time_after_eq(jiffies + 1, sp->resend_at)) {
+			sp->need_resend = 1;
+			resend |= 1;
+		} else if (resend & 2) {
+			if (time_before(sp->resend_at, resend_at))
+				resend_at = sp->resend_at;
+		} else {
+			resend_at = sp->resend_at;
+			resend |= 2;
+		}
+	}
+
+	rxrpc_set_resend(call, resend, resend_at);
+	_leave("");
+}
+
+/*
+ * process soft ACKs of our transmitted packets
+ * - these indicate packets the peer has or has not received, but hasn't yet
+ *   given to the consumer, and so can still be discarded and re-requested
+ */
+static int rxrpc_process_soft_ACKs(struct rxrpc_call *call,
+				   struct rxrpc_ackpacket *ack,
+				   struct sk_buff *skb)
+{
+	struct rxrpc_skb_priv *sp;
+	struct sk_buff *txb;
+	unsigned long *p_txb, resend_at;
+	int loop;
+	u8 sacks[RXRPC_MAXACKS], resend;
+
+	_enter("{%d,%d},{%d},",
+	       call->acks_hard,
+	       CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz),
+	       ack->nAcks);
+
+	if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0)
+		goto protocol_error;
+
+	resend = 0;
+	resend_at = 0;
+	for (loop = 0; loop < ack->nAcks; loop++) {
+		p_txb = call->acks_window;
+		p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1);
+		smp_read_barrier_depends();
+		txb = (struct sk_buff *) (*p_txb & ~1);
+		sp = rxrpc_skb(txb);
+
+		switch (sacks[loop]) {
+		case RXRPC_ACK_TYPE_ACK:
+			sp->need_resend = 0;
+			*p_txb |= 1;
+			break;
+		case RXRPC_ACK_TYPE_NACK:
+			sp->need_resend = 1;
+			*p_txb &= ~1;
+			resend = 1;
+			break;
+		default:
+			_debug("Unsupported ACK type %d", sacks[loop]);
+			goto protocol_error;
+		}
+	}
+
+	smp_mb();
+	call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1);
+
+	/* anything not explicitly ACK'd is implicitly NACK'd, but may just not
+	 * have been received or processed yet by the far end */
+	for (loop = call->acks_unacked;
+	     loop != call->acks_head;
+	     loop = (loop + 1) &  (call->acks_winsz - 1)
+	     ) {
+		p_txb = call->acks_window + loop;
+		smp_read_barrier_depends();
+		txb = (struct sk_buff *) (*p_txb & ~1);
+		sp = rxrpc_skb(txb);
+
+		if (*p_txb & 1) {
+			/* packet must have been discarded */
+			sp->need_resend = 1;
+			*p_txb &= ~1;
+			resend |= 1;
+		} else if (sp->need_resend) {
+			;
+		} else if (time_after_eq(jiffies + 1, sp->resend_at)) {
+			sp->need_resend = 1;
+			resend |= 1;
+		} else if (resend & 2) {
+			if (time_before(sp->resend_at, resend_at))
+				resend_at = sp->resend_at;
+		} else {
+			resend_at = sp->resend_at;
+			resend |= 2;
+		}
+	}
+
+	rxrpc_set_resend(call, resend, resend_at);
+	_leave(" = 0");
+	return 0;
+
+protocol_error:
+	_leave(" = -EPROTO");
+	return -EPROTO;
+}
+
+/*
+ * discard hard-ACK'd packets from the Tx window
+ */
+static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard)
+{
+	struct rxrpc_skb_priv *sp;
+	unsigned long _skb;
+	int tail = call->acks_tail, old_tail;
+	int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz);
+
+	_enter("{%u,%u},%u", call->acks_hard, win, hard);
+
+	ASSERTCMP(hard - call->acks_hard, <=, win);
+
+	while (call->acks_hard < hard) {
+		smp_read_barrier_depends();
+		_skb = call->acks_window[tail] & ~1;
+		sp = rxrpc_skb((struct sk_buff *) _skb);
+		rxrpc_free_skb((struct sk_buff *) _skb);
+		old_tail = tail;
+		tail = (tail + 1) & (call->acks_winsz - 1);
+		call->acks_tail = tail;
+		if (call->acks_unacked == old_tail)
+			call->acks_unacked = tail;
+		call->acks_hard++;
+	}
+
+	wake_up(&call->tx_waitq);
+}
+
+/*
+ * clear the Tx window in the event of a failure
+ */
+static void rxrpc_clear_tx_window(struct rxrpc_call *call)
+{
+	rxrpc_rotate_tx_window(call, atomic_read(&call->sequence));
+}
+
+/*
+ * drain the out of sequence received packet queue into the packet Rx queue
+ */
+static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call)
+{
+	struct rxrpc_skb_priv *sp;
+	struct sk_buff *skb;
+	bool terminal;
+	int ret;
+
+	_enter("{%d,%d}", call->rx_data_post, call->rx_first_oos);
+
+	spin_lock_bh(&call->lock);
+
+	ret = -ECONNRESET;
+	if (test_bit(RXRPC_CALL_RELEASED, &call->flags))
+		goto socket_unavailable;
+
+	skb = skb_dequeue(&call->rx_oos_queue);
+	if (skb) {
+		sp = rxrpc_skb(skb);
+
+		_debug("drain OOS packet %d [%d]",
+		       ntohl(sp->hdr.seq), call->rx_first_oos);
+
+		if (ntohl(sp->hdr.seq) != call->rx_first_oos) {
+			skb_queue_head(&call->rx_oos_queue, skb);
+			call->rx_first_oos = ntohl(rxrpc_skb(skb)->hdr.seq);
+			_debug("requeue %p {%u}", skb, call->rx_first_oos);
+		} else {
+			skb->mark = RXRPC_SKB_MARK_DATA;
+			terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) &&
+				!(sp->hdr.flags & RXRPC_CLIENT_INITIATED));
+			ret = rxrpc_queue_rcv_skb(call, skb, true, terminal);
+			BUG_ON(ret < 0);
+			_debug("drain #%u", call->rx_data_post);
+			call->rx_data_post++;
+
+			/* find out what the next packet is */
+			skb = skb_peek(&call->rx_oos_queue);
+			if (skb)
+				call->rx_first_oos =
+					ntohl(rxrpc_skb(skb)->hdr.seq);
+			else
+				call->rx_first_oos = 0;
+			_debug("peek %p {%u}", skb, call->rx_first_oos);
+		}
+	}
+
+	ret = 0;
+socket_unavailable:
+	spin_unlock_bh(&call->lock);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * insert an out of sequence packet into the buffer
+ */
+static void rxrpc_insert_oos_packet(struct rxrpc_call *call,
+				    struct sk_buff *skb)
+{
+	struct rxrpc_skb_priv *sp, *psp;
+	struct sk_buff *p;
+	u32 seq;
+
+	sp = rxrpc_skb(skb);
+	seq = ntohl(sp->hdr.seq);
+	_enter(",,{%u}", seq);
+
+	skb->destructor = rxrpc_packet_destructor;
+	ASSERTCMP(sp->call, ==, NULL);
+	sp->call = call;
+	rxrpc_get_call(call);
+
+	/* insert into the buffer in sequence order */
+	spin_lock_bh(&call->lock);
+
+	skb_queue_walk(&call->rx_oos_queue, p) {
+		psp = rxrpc_skb(p);
+		if (ntohl(psp->hdr.seq) > seq) {
+			_debug("insert oos #%u before #%u",
+			       seq, ntohl(psp->hdr.seq));
+			skb_insert(p, skb, &call->rx_oos_queue);
+			goto inserted;
+		}
+	}
+
+	_debug("append oos #%u", seq);
+	skb_queue_tail(&call->rx_oos_queue, skb);
+inserted:
+
+	/* we might now have a new front to the queue */
+	if (call->rx_first_oos == 0 || seq < call->rx_first_oos)
+		call->rx_first_oos = seq;
+
+	read_lock(&call->state_lock);
+	if (call->state < RXRPC_CALL_COMPLETE &&
+	    call->rx_data_post == call->rx_first_oos) {
+		_debug("drain rx oos now");
+		set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events);
+	}
+	read_unlock(&call->state_lock);
+
+	spin_unlock_bh(&call->lock);
+	_leave(" [stored #%u]", call->rx_first_oos);
+}
+
+/*
+ * clear the Tx window on final ACK reception
+ */
+static void rxrpc_zap_tx_window(struct rxrpc_call *call)
+{
+	struct rxrpc_skb_priv *sp;
+	struct sk_buff *skb;
+	unsigned long _skb, *acks_window;
+	uint8_t winsz = call->acks_winsz;
+	int tail;
+
+	acks_window = call->acks_window;
+	call->acks_window = NULL;
+
+	while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) {
+		tail = call->acks_tail;
+		smp_read_barrier_depends();
+		_skb = acks_window[tail] & ~1;
+		smp_mb();
+		call->acks_tail = (call->acks_tail + 1) & (winsz - 1);
+
+		skb = (struct sk_buff *) _skb;
+		sp = rxrpc_skb(skb);
+		_debug("+++ clear Tx %u", ntohl(sp->hdr.seq));
+		rxrpc_free_skb(skb);
+	}
+
+	kfree(acks_window);
+}
+
+/*
+ * process packets in the reception queue
+ */
+static int rxrpc_process_rx_queue(struct rxrpc_call *call,
+				  u32 *_abort_code)
+{
+	struct rxrpc_ackpacket ack;
+	struct rxrpc_skb_priv *sp;
+	struct sk_buff *skb;
+	bool post_ACK;
+	int latest;
+	u32 hard, tx;
+
+	_enter("");
+
+process_further:
+	skb = skb_dequeue(&call->rx_queue);
+	if (!skb)
+		return -EAGAIN;
+
+	_net("deferred skb %p", skb);
+
+	sp = rxrpc_skb(skb);
+
+	_debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state);
+
+	post_ACK = false;
+
+	switch (sp->hdr.type) {
+		/* data packets that wind up here have been received out of
+		 * order, need security processing or are jumbo packets */
+	case RXRPC_PACKET_TYPE_DATA:
+		_proto("OOSQ DATA %%%u { #%u }",
+		       ntohl(sp->hdr.serial), ntohl(sp->hdr.seq));
+
+		/* secured packets must be verified and possibly decrypted */
+		if (rxrpc_verify_packet(call, skb, _abort_code) < 0)
+			goto protocol_error;
+
+		rxrpc_insert_oos_packet(call, skb);
+		goto process_further;
+
+		/* partial ACK to process */
+	case RXRPC_PACKET_TYPE_ACK:
+		if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) {
+			_debug("extraction failure");
+			goto protocol_error;
+		}
+		if (!skb_pull(skb, sizeof(ack)))
+			BUG();
+
+		latest = ntohl(sp->hdr.serial);
+		hard = ntohl(ack.firstPacket);
+		tx = atomic_read(&call->sequence);
+
+		_proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
+		       latest,
+		       ntohs(ack.maxSkew),
+		       hard,
+		       ntohl(ack.previousPacket),
+		       ntohl(ack.serial),
+		       rxrpc_acks[ack.reason],
+		       ack.nAcks);
+
+		if (ack.reason == RXRPC_ACK_PING) {
+			_proto("Rx ACK %%%u PING Request", latest);
+			rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE,
+					  sp->hdr.serial, true);
+		}
+
+		/* discard any out-of-order or duplicate ACKs */
+		if (latest - call->acks_latest <= 0) {
+			_debug("discard ACK %d <= %d",
+			       latest, call->acks_latest);
+			goto discard;
+		}
+		call->acks_latest = latest;
+
+		if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
+		    call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY &&
+		    call->state != RXRPC_CALL_SERVER_SEND_REPLY &&
+		    call->state != RXRPC_CALL_SERVER_AWAIT_ACK)
+			goto discard;
+
+		_debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state);
+
+		if (hard > 0) {
+			if (hard - 1 > tx) {
+				_debug("hard-ACK'd packet %d not transmitted"
+				       " (%d top)",
+				       hard - 1, tx);
+				goto protocol_error;
+			}
+
+			if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY ||
+			     call->state == RXRPC_CALL_SERVER_AWAIT_ACK) &&
+			    hard > tx)
+				goto all_acked;
+
+			smp_rmb();
+			rxrpc_rotate_tx_window(call, hard - 1);
+		}
+
+		if (ack.nAcks > 0) {
+			if (hard - 1 + ack.nAcks > tx) {
+				_debug("soft-ACK'd packet %d+%d not"
+				       " transmitted (%d top)",
+				       hard - 1, ack.nAcks, tx);
+				goto protocol_error;
+			}
+
+			if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0)
+				goto protocol_error;
+		}
+		goto discard;
+
+		/* complete ACK to process */
+	case RXRPC_PACKET_TYPE_ACKALL:
+		goto all_acked;
+
+		/* abort and busy are handled elsewhere */
+	case RXRPC_PACKET_TYPE_BUSY:
+	case RXRPC_PACKET_TYPE_ABORT:
+		BUG();
+
+		/* connection level events - also handled elsewhere */
+	case RXRPC_PACKET_TYPE_CHALLENGE:
+	case RXRPC_PACKET_TYPE_RESPONSE:
+	case RXRPC_PACKET_TYPE_DEBUG:
+		BUG();
+	}
+
+	/* if we've had a hard ACK that covers all the packets we've sent, then
+	 * that ends that phase of the operation */
+all_acked:
+	write_lock_bh(&call->state_lock);
+	_debug("ack all %d", call->state);
+
+	switch (call->state) {
+	case RXRPC_CALL_CLIENT_AWAIT_REPLY:
+		call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
+		break;
+	case RXRPC_CALL_SERVER_AWAIT_ACK:
+		_debug("srv complete");
+		call->state = RXRPC_CALL_COMPLETE;
+		post_ACK = true;
+		break;
+	case RXRPC_CALL_CLIENT_SEND_REQUEST:
+	case RXRPC_CALL_SERVER_RECV_REQUEST:
+		goto protocol_error_unlock; /* can't occur yet */
+	default:
+		write_unlock_bh(&call->state_lock);
+		goto discard; /* assume packet left over from earlier phase */
+	}
+
+	write_unlock_bh(&call->state_lock);
+
+	/* if all the packets we sent are hard-ACK'd, then we can discard
+	 * whatever we've got left */
+	_debug("clear Tx %d",
+	       CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz));
+
+	del_timer_sync(&call->resend_timer);
+	clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+	clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
+
+	if (call->acks_window)
+		rxrpc_zap_tx_window(call);
+
+	if (post_ACK) {
+		/* post the final ACK message for userspace to pick up */
+		_debug("post ACK");
+		skb->mark = RXRPC_SKB_MARK_FINAL_ACK;
+		sp->call = call;
+		rxrpc_get_call(call);
+		spin_lock_bh(&call->lock);
+		if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0)
+			BUG();
+		spin_unlock_bh(&call->lock);
+		goto process_further;
+	}
+
+discard:
+	rxrpc_free_skb(skb);
+	goto process_further;
+
+protocol_error_unlock:
+	write_unlock_bh(&call->state_lock);
+protocol_error:
+	rxrpc_free_skb(skb);
+	_leave(" = -EPROTO");
+	return -EPROTO;
+}
+
+/*
+ * post a message to the socket Rx queue for recvmsg() to pick up
+ */
+static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error,
+			      bool fatal)
+{
+	struct rxrpc_skb_priv *sp;
+	struct sk_buff *skb;
+	int ret;
+
+	_enter("{%d,%lx},%u,%u,%d",
+	       call->debug_id, call->flags, mark, error, fatal);
+
+	/* remove timers and things for fatal messages */
+	if (fatal) {
+		del_timer_sync(&call->resend_timer);
+		del_timer_sync(&call->ack_timer);
+		clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+	}
+
+	if (mark != RXRPC_SKB_MARK_NEW_CALL &&
+	    !test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
+		_leave("[no userid]");
+		return 0;
+	}
+
+	if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
+		skb = alloc_skb(0, GFP_NOFS);
+		if (!skb)
+			return -ENOMEM;
+
+		rxrpc_new_skb(skb);
+
+		skb->mark = mark;
+
+		sp = rxrpc_skb(skb);
+		memset(sp, 0, sizeof(*sp));
+		sp->error = error;
+		sp->call = call;
+		rxrpc_get_call(call);
+
+		spin_lock_bh(&call->lock);
+		ret = rxrpc_queue_rcv_skb(call, skb, true, fatal);
+		spin_unlock_bh(&call->lock);
+		if (ret < 0)
+			BUG();
+	}
+
+	return 0;
+}
+
+/*
+ * handle background processing of incoming call packets and ACK / abort
+ * generation
+ */
+void rxrpc_process_call(struct work_struct *work)
+{
+	struct rxrpc_call *call =
+		container_of(work, struct rxrpc_call, processor);
+	struct rxrpc_ackpacket ack;
+	struct rxrpc_ackinfo ackinfo;
+	struct rxrpc_header hdr;
+	struct msghdr msg;
+	struct kvec iov[5];
+	unsigned long bits;
+	__be32 data;
+	size_t len;
+	int genbit, loop, nbit, ioc, ret;
+	u32 abort_code = RX_PROTOCOL_ERROR;
+	u8 *acks = NULL;
+
+	//printk("\n--------------------\n");
+	_enter("{%d,%s,%lx} [%lu]",
+	       call->debug_id, rxrpc_call_states[call->state], call->events,
+	       (jiffies - call->creation_jif) / (HZ / 10));
+
+	if (test_and_set_bit(RXRPC_CALL_PROC_BUSY, &call->flags)) {
+		_debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX");
+		return;
+	}
+
+	/* there's a good chance we're going to have to send a message, so set
+	 * one up in advance */
+	msg.msg_name	= &call->conn->trans->peer->srx.transport.sin;
+	msg.msg_namelen	= sizeof(call->conn->trans->peer->srx.transport.sin);
+	msg.msg_control	= NULL;
+	msg.msg_controllen = 0;
+	msg.msg_flags	= 0;
+
+	hdr.epoch	= call->conn->epoch;
+	hdr.cid		= call->cid;
+	hdr.callNumber	= call->call_id;
+	hdr.seq		= 0;
+	hdr.type	= RXRPC_PACKET_TYPE_ACK;
+	hdr.flags	= call->conn->out_clientflag;
+	hdr.userStatus	= 0;
+	hdr.securityIndex = call->conn->security_ix;
+	hdr._rsvd	= 0;
+	hdr.serviceId	= call->conn->service_id;
+
+	memset(iov, 0, sizeof(iov));
+	iov[0].iov_base	= &hdr;
+	iov[0].iov_len	= sizeof(hdr);
+
+	/* deal with events of a final nature */
+	if (test_bit(RXRPC_CALL_RELEASE, &call->events)) {
+		rxrpc_release_call(call);
+		clear_bit(RXRPC_CALL_RELEASE, &call->events);
+	}
+
+	if (test_bit(RXRPC_CALL_RCVD_ERROR, &call->events)) {
+		int error;
+
+		clear_bit(RXRPC_CALL_CONN_ABORT, &call->events);
+		clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events);
+		clear_bit(RXRPC_CALL_ABORT, &call->events);
+
+		error = call->conn->trans->peer->net_error;
+		_debug("post net error %d", error);
+
+		if (rxrpc_post_message(call, RXRPC_SKB_MARK_NET_ERROR,
+				       error, true) < 0)
+			goto no_mem;
+		clear_bit(RXRPC_CALL_RCVD_ERROR, &call->events);
+		goto kill_ACKs;
+	}
+
+	if (test_bit(RXRPC_CALL_CONN_ABORT, &call->events)) {
+		ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE);
+
+		clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events);
+		clear_bit(RXRPC_CALL_ABORT, &call->events);
+
+		_debug("post conn abort");
+
+		if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
+				       call->conn->error, true) < 0)
+			goto no_mem;
+		clear_bit(RXRPC_CALL_CONN_ABORT, &call->events);
+		goto kill_ACKs;
+	}
+
+	if (test_bit(RXRPC_CALL_REJECT_BUSY, &call->events)) {
+		hdr.type = RXRPC_PACKET_TYPE_BUSY;
+		genbit = RXRPC_CALL_REJECT_BUSY;
+		goto send_message;
+	}
+
+	if (test_bit(RXRPC_CALL_ABORT, &call->events)) {
+		ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE);
+
+		if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
+				       ECONNABORTED, true) < 0)
+			goto no_mem;
+		hdr.type = RXRPC_PACKET_TYPE_ABORT;
+		data = htonl(call->abort_code);
+		iov[1].iov_base = &data;
+		iov[1].iov_len = sizeof(data);
+		genbit = RXRPC_CALL_ABORT;
+		goto send_message;
+	}
+
+	if (test_bit(RXRPC_CALL_ACK_FINAL, &call->events)) {
+		hdr.type = RXRPC_PACKET_TYPE_ACKALL;
+		genbit = RXRPC_CALL_ACK_FINAL;
+		goto send_message;
+	}
+
+	if (call->events & ((1 << RXRPC_CALL_RCVD_BUSY) |
+			    (1 << RXRPC_CALL_RCVD_ABORT))
+	    ) {
+		u32 mark;
+
+		if (test_bit(RXRPC_CALL_RCVD_ABORT, &call->events))
+			mark = RXRPC_SKB_MARK_REMOTE_ABORT;
+		else
+			mark = RXRPC_SKB_MARK_BUSY;
+
+		_debug("post abort/busy");
+		rxrpc_clear_tx_window(call);
+		if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0)
+			goto no_mem;
+
+		clear_bit(RXRPC_CALL_RCVD_BUSY, &call->events);
+		clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
+		goto kill_ACKs;
+	}
+
+	if (test_and_clear_bit(RXRPC_CALL_RCVD_ACKALL, &call->events)) {
+		_debug("do implicit ackall");
+		rxrpc_clear_tx_window(call);
+	}
+
+	if (test_bit(RXRPC_CALL_LIFE_TIMER, &call->events)) {
+		write_lock_bh(&call->state_lock);
+		if (call->state <= RXRPC_CALL_COMPLETE) {
+			call->state = RXRPC_CALL_LOCALLY_ABORTED;
+			call->abort_code = RX_CALL_TIMEOUT;
+			set_bit(RXRPC_CALL_ABORT, &call->events);
+		}
+		write_unlock_bh(&call->state_lock);
+
+		_debug("post timeout");
+		if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR,
+				       ETIME, true) < 0)
+			goto no_mem;
+
+		clear_bit(RXRPC_CALL_LIFE_TIMER, &call->events);
+		goto kill_ACKs;
+	}
+
+	/* deal with assorted inbound messages */
+	if (!skb_queue_empty(&call->rx_queue)) {
+		switch (rxrpc_process_rx_queue(call, &abort_code)) {
+		case 0:
+		case -EAGAIN:
+			break;
+		case -ENOMEM:
+			goto no_mem;
+		case -EKEYEXPIRED:
+		case -EKEYREJECTED:
+		case -EPROTO:
+			rxrpc_abort_call(call, abort_code);
+			goto kill_ACKs;
+		}
+	}
+
+	/* handle resending */
+	if (test_and_clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events))
+		rxrpc_resend_timer(call);
+	if (test_and_clear_bit(RXRPC_CALL_RESEND, &call->events))
+		rxrpc_resend(call);
+
+	/* consider sending an ordinary ACK */
+	if (test_bit(RXRPC_CALL_ACK, &call->events)) {
+		__be32 pad;
+
+		_debug("send ACK: window: %d - %d { %lx }",
+		       call->rx_data_eaten, call->ackr_win_top,
+		       call->ackr_window[0]);
+
+		if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST &&
+		    call->ackr_reason != RXRPC_ACK_PING_RESPONSE) {
+			/* ACK by sending reply DATA packet in this state */
+			clear_bit(RXRPC_CALL_ACK, &call->events);
+			goto maybe_reschedule;
+		}
+
+		genbit = RXRPC_CALL_ACK;
+
+		acks = kzalloc(call->ackr_win_top - call->rx_data_eaten,
+			       GFP_NOFS);
+		if (!acks)
+			goto no_mem;
+
+		//hdr.flags	= RXRPC_SLOW_START_OK;
+		ack.bufferSpace	= htons(8);
+		ack.maxSkew	= 0;
+		ack.serial	= 0;
+		ack.reason	= 0;
+
+		ackinfo.rxMTU	= htonl(5692);
+//		ackinfo.rxMTU	= htonl(call->conn->trans->peer->maxdata);
+		ackinfo.maxMTU	= htonl(call->conn->trans->peer->maxdata);
+		ackinfo.rwind	= htonl(32);
+		ackinfo.jumbo_max = htonl(4);
+
+		spin_lock_bh(&call->lock);
+		ack.reason = call->ackr_reason;
+		ack.serial = call->ackr_serial;
+		ack.previousPacket = call->ackr_prev_seq;
+		ack.firstPacket = htonl(call->rx_data_eaten + 1);
+
+		ack.nAcks = 0;
+		for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) {
+			nbit = loop * BITS_PER_LONG;
+			for (bits = call->ackr_window[loop]; bits; bits >>= 1
+			     ) {
+				_debug("- l=%d n=%d b=%lx", loop, nbit, bits);
+				if (bits & 1) {
+					acks[nbit] = RXRPC_ACK_TYPE_ACK;
+					ack.nAcks = nbit + 1;
+				}
+				nbit++;
+			}
+		}
+		call->ackr_reason = 0;
+		spin_unlock_bh(&call->lock);
+
+		pad = 0;
+
+		iov[1].iov_base = &ack;
+		iov[1].iov_len	= sizeof(ack);
+		iov[2].iov_base = acks;
+		iov[2].iov_len	= ack.nAcks;
+		iov[3].iov_base = &pad;
+		iov[3].iov_len	= 3;
+		iov[4].iov_base = &ackinfo;
+		iov[4].iov_len	= sizeof(ackinfo);
+
+		switch (ack.reason) {
+		case RXRPC_ACK_REQUESTED:
+		case RXRPC_ACK_DUPLICATE:
+		case RXRPC_ACK_OUT_OF_SEQUENCE:
+		case RXRPC_ACK_EXCEEDS_WINDOW:
+		case RXRPC_ACK_NOSPACE:
+		case RXRPC_ACK_PING:
+		case RXRPC_ACK_PING_RESPONSE:
+			goto send_ACK_with_skew;
+		case RXRPC_ACK_DELAY:
+		case RXRPC_ACK_IDLE:
+			goto send_ACK;
+		}
+	}
+
+	/* handle completion of security negotiations on an incoming
+	 * connection */
+	if (test_and_clear_bit(RXRPC_CALL_SECURED, &call->events)) {
+		_debug("secured");
+		spin_lock_bh(&call->lock);
+
+		if (call->state == RXRPC_CALL_SERVER_SECURING) {
+			_debug("securing");
+			write_lock(&call->conn->lock);
+			if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+			    !test_bit(RXRPC_CALL_RELEASE, &call->events)) {
+				_debug("not released");
+				call->state = RXRPC_CALL_SERVER_ACCEPTING;
+				list_move_tail(&call->accept_link,
+					       &call->socket->acceptq);
+			}
+			write_unlock(&call->conn->lock);
+			read_lock(&call->state_lock);
+			if (call->state < RXRPC_CALL_COMPLETE)
+				set_bit(RXRPC_CALL_POST_ACCEPT, &call->events);
+			read_unlock(&call->state_lock);
+		}
+
+		spin_unlock_bh(&call->lock);
+		if (!test_bit(RXRPC_CALL_POST_ACCEPT, &call->events))
+			goto maybe_reschedule;
+	}
+
+	/* post a notification of an acceptable connection to the app */
+	if (test_bit(RXRPC_CALL_POST_ACCEPT, &call->events)) {
+		_debug("post accept");
+		if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL,
+				       0, false) < 0)
+			goto no_mem;
+		clear_bit(RXRPC_CALL_POST_ACCEPT, &call->events);
+		goto maybe_reschedule;
+	}
+
+	/* handle incoming call acceptance */
+	if (test_and_clear_bit(RXRPC_CALL_ACCEPTED, &call->events)) {
+		_debug("accepted");
+		ASSERTCMP(call->rx_data_post, ==, 0);
+		call->rx_data_post = 1;
+		read_lock_bh(&call->state_lock);
+		if (call->state < RXRPC_CALL_COMPLETE)
+			set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events);
+		read_unlock_bh(&call->state_lock);
+	}
+
+	/* drain the out of sequence received packet queue into the packet Rx
+	 * queue */
+	if (test_and_clear_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events)) {
+		while (call->rx_data_post == call->rx_first_oos)
+			if (rxrpc_drain_rx_oos_queue(call) < 0)
+				break;
+		goto maybe_reschedule;
+	}
+
+	/* other events may have been raised since we started checking */
+	goto maybe_reschedule;
+
+send_ACK_with_skew:
+	ack.maxSkew = htons(atomic_read(&call->conn->hi_serial) -
+			    ntohl(ack.serial));
+send_ACK:
+	hdr.serial = htonl(atomic_inc_return(&call->conn->serial));
+	_proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
+	       ntohl(hdr.serial),
+	       ntohs(ack.maxSkew),
+	       ntohl(ack.firstPacket),
+	       ntohl(ack.previousPacket),
+	       ntohl(ack.serial),
+	       rxrpc_acks[ack.reason],
+	       ack.nAcks);
+
+	del_timer_sync(&call->ack_timer);
+	if (ack.nAcks > 0)
+		set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags);
+	goto send_message_2;
+
+send_message:
+	_debug("send message");
+
+	hdr.serial = htonl(atomic_inc_return(&call->conn->serial));
+	_proto("Tx %s %%%u", rxrpc_pkts[hdr.type], ntohl(hdr.serial));
+send_message_2:
+
+	len = iov[0].iov_len;
+	ioc = 1;
+	if (iov[4].iov_len) {
+		ioc = 5;
+		len += iov[4].iov_len;
+		len += iov[3].iov_len;
+		len += iov[2].iov_len;
+		len += iov[1].iov_len;
+	} else if (iov[3].iov_len) {
+		ioc = 4;
+		len += iov[3].iov_len;
+		len += iov[2].iov_len;
+		len += iov[1].iov_len;
+	} else if (iov[2].iov_len) {
+		ioc = 3;
+		len += iov[2].iov_len;
+		len += iov[1].iov_len;
+	} else if (iov[1].iov_len) {
+		ioc = 2;
+		len += iov[1].iov_len;
+	}
+
+	ret = kernel_sendmsg(call->conn->trans->local->socket,
+			     &msg, iov, ioc, len);
+	if (ret < 0) {
+		_debug("sendmsg failed: %d", ret);
+		read_lock_bh(&call->state_lock);
+		if (call->state < RXRPC_CALL_DEAD)
+			schedule_work(&call->processor);
+		read_unlock_bh(&call->state_lock);
+		goto error;
+	}
+
+	switch (genbit) {
+	case RXRPC_CALL_ABORT:
+		clear_bit(genbit, &call->events);
+		clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
+		goto kill_ACKs;
+
+	case RXRPC_CALL_ACK_FINAL:
+		write_lock_bh(&call->state_lock);
+		if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK)
+			call->state = RXRPC_CALL_COMPLETE;
+		write_unlock_bh(&call->state_lock);
+		goto kill_ACKs;
+
+	default:
+		clear_bit(genbit, &call->events);
+		switch (call->state) {
+		case RXRPC_CALL_CLIENT_AWAIT_REPLY:
+		case RXRPC_CALL_CLIENT_RECV_REPLY:
+		case RXRPC_CALL_SERVER_RECV_REQUEST:
+		case RXRPC_CALL_SERVER_ACK_REQUEST:
+			_debug("start ACK timer");
+			rxrpc_propose_ACK(call, RXRPC_ACK_DELAY,
+					  call->ackr_serial, false);
+		default:
+			break;
+		}
+		goto maybe_reschedule;
+	}
+
+kill_ACKs:
+	del_timer_sync(&call->ack_timer);
+	if (test_and_clear_bit(RXRPC_CALL_ACK_FINAL, &call->events))
+		rxrpc_put_call(call);
+	clear_bit(RXRPC_CALL_ACK, &call->events);
+
+maybe_reschedule:
+	if (call->events || !skb_queue_empty(&call->rx_queue)) {
+		read_lock_bh(&call->state_lock);
+		if (call->state < RXRPC_CALL_DEAD)
+			schedule_work(&call->processor);
+		read_unlock_bh(&call->state_lock);
+	}
+
+	/* don't leave aborted connections on the accept queue */
+	if (call->state >= RXRPC_CALL_COMPLETE &&
+	    !list_empty(&call->accept_link)) {
+		_debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }",
+		       call, call->events, call->flags,
+		       ntohl(call->conn->cid));
+
+		read_lock_bh(&call->state_lock);
+		if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+		    !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
+			schedule_work(&call->processor);
+		read_unlock_bh(&call->state_lock);
+	}
+
+error:
+	clear_bit(RXRPC_CALL_PROC_BUSY, &call->flags);
+	kfree(acks);
+
+	/* because we don't want two CPUs both processing the work item for one
+	 * call at the same time, we use a flag to note when it's busy; however
+	 * this means there's a race between clearing the flag and setting the
+	 * work pending bit and the work item being processed again */
+	if (call->events && !work_pending(&call->processor)) {
+		_debug("jumpstart %x", ntohl(call->conn->cid));
+		schedule_work(&call->processor);
+	}
+
+	_leave("");
+	return;
+
+no_mem:
+	_debug("out of memory");
+	goto maybe_reschedule;
+}
diff --git a/net/rxrpc/ar-call.c b/net/rxrpc/ar-call.c
new file mode 100644
index 0000000..ac31cce
--- /dev/null
+++ b/net/rxrpc/ar-call.c
@@ -0,0 +1,787 @@
+/* RxRPC individual remote procedure call handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/circ_buf.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+struct kmem_cache *rxrpc_call_jar;
+LIST_HEAD(rxrpc_calls);
+DEFINE_RWLOCK(rxrpc_call_lock);
+static unsigned rxrpc_call_max_lifetime = 60;
+static unsigned rxrpc_dead_call_timeout = 10;
+
+static void rxrpc_destroy_call(struct work_struct *work);
+static void rxrpc_call_life_expired(unsigned long _call);
+static void rxrpc_dead_call_expired(unsigned long _call);
+static void rxrpc_ack_time_expired(unsigned long _call);
+static void rxrpc_resend_time_expired(unsigned long _call);
+
+/*
+ * allocate a new call
+ */
+static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
+{
+	struct rxrpc_call *call;
+
+	call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
+	if (!call)
+		return NULL;
+
+	call->acks_winsz = 16;
+	call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long),
+				    gfp);
+	if (!call->acks_window) {
+		kmem_cache_free(rxrpc_call_jar, call);
+		return NULL;
+	}
+
+	setup_timer(&call->lifetimer, &rxrpc_call_life_expired,
+		    (unsigned long) call);
+	setup_timer(&call->deadspan, &rxrpc_dead_call_expired,
+		    (unsigned long) call);
+	setup_timer(&call->ack_timer, &rxrpc_ack_time_expired,
+		    (unsigned long) call);
+	setup_timer(&call->resend_timer, &rxrpc_resend_time_expired,
+		    (unsigned long) call);
+	INIT_WORK(&call->destroyer, &rxrpc_destroy_call);
+	INIT_WORK(&call->processor, &rxrpc_process_call);
+	INIT_LIST_HEAD(&call->accept_link);
+	skb_queue_head_init(&call->rx_queue);
+	skb_queue_head_init(&call->rx_oos_queue);
+	init_waitqueue_head(&call->tx_waitq);
+	spin_lock_init(&call->lock);
+	rwlock_init(&call->state_lock);
+	atomic_set(&call->usage, 1);
+	call->debug_id = atomic_inc_return(&rxrpc_debug_id);
+	call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;
+
+	memset(&call->sock_node, 0xed, sizeof(call->sock_node));
+
+	call->rx_data_expect = 1;
+	call->rx_data_eaten = 0;
+	call->rx_first_oos = 0;
+	call->ackr_win_top = call->rx_data_eaten + 1 + RXRPC_MAXACKS;
+	call->creation_jif = jiffies;
+	return call;
+}
+
+/*
+ * allocate a new client call and attempt to to get a connection slot for it
+ */
+static struct rxrpc_call *rxrpc_alloc_client_call(
+	struct rxrpc_sock *rx,
+	struct rxrpc_transport *trans,
+	struct rxrpc_conn_bundle *bundle,
+	gfp_t gfp)
+{
+	struct rxrpc_call *call;
+	int ret;
+
+	_enter("");
+
+	ASSERT(rx != NULL);
+	ASSERT(trans != NULL);
+	ASSERT(bundle != NULL);
+
+	call = rxrpc_alloc_call(gfp);
+	if (!call)
+		return ERR_PTR(-ENOMEM);
+
+	sock_hold(&rx->sk);
+	call->socket = rx;
+	call->rx_data_post = 1;
+
+	ret = rxrpc_connect_call(rx, trans, bundle, call, gfp);
+	if (ret < 0) {
+		kmem_cache_free(rxrpc_call_jar, call);
+		return ERR_PTR(ret);
+	}
+
+	spin_lock(&call->conn->trans->peer->lock);
+	list_add(&call->error_link, &call->conn->trans->peer->error_targets);
+	spin_unlock(&call->conn->trans->peer->lock);
+
+	call->lifetimer.expires = jiffies + rxrpc_call_max_lifetime * HZ;
+	add_timer(&call->lifetimer);
+
+	_leave(" = %p", call);
+	return call;
+}
+
+/*
+ * set up a call for the given data
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *rx,
+					 struct rxrpc_transport *trans,
+					 struct rxrpc_conn_bundle *bundle,
+					 unsigned long user_call_ID,
+					 int create,
+					 gfp_t gfp)
+{
+	struct rxrpc_call *call, *candidate;
+	struct rb_node *p, *parent, **pp;
+
+	_enter("%p,%d,%d,%lx,%d",
+	       rx, trans ? trans->debug_id : -1, bundle ? bundle->debug_id : -1,
+	       user_call_ID, create);
+
+	/* search the extant calls first for one that matches the specified
+	 * user ID */
+	read_lock(&rx->call_lock);
+
+	p = rx->calls.rb_node;
+	while (p) {
+		call = rb_entry(p, struct rxrpc_call, sock_node);
+
+		if (user_call_ID < call->user_call_ID)
+			p = p->rb_left;
+		else if (user_call_ID > call->user_call_ID)
+			p = p->rb_right;
+		else
+			goto found_extant_call;
+	}
+
+	read_unlock(&rx->call_lock);
+
+	if (!create || !trans)
+		return ERR_PTR(-EBADSLT);
+
+	/* not yet present - create a candidate for a new record and then
+	 * redo the search */
+	candidate = rxrpc_alloc_client_call(rx, trans, bundle, gfp);
+	if (IS_ERR(candidate)) {
+		_leave(" = %ld", PTR_ERR(candidate));
+		return candidate;
+	}
+
+	candidate->user_call_ID = user_call_ID;
+	__set_bit(RXRPC_CALL_HAS_USERID, &candidate->flags);
+
+	write_lock(&rx->call_lock);
+
+	pp = &rx->calls.rb_node;
+	parent = NULL;
+	while (*pp) {
+		parent = *pp;
+		call = rb_entry(parent, struct rxrpc_call, sock_node);
+
+		if (user_call_ID < call->user_call_ID)
+			pp = &(*pp)->rb_left;
+		else if (user_call_ID > call->user_call_ID)
+			pp = &(*pp)->rb_right;
+		else
+			goto found_extant_second;
+	}
+
+	/* second search also failed; add the new call */
+	call = candidate;
+	candidate = NULL;
+	rxrpc_get_call(call);
+
+	rb_link_node(&call->sock_node, parent, pp);
+	rb_insert_color(&call->sock_node, &rx->calls);
+	write_unlock(&rx->call_lock);
+
+	write_lock_bh(&rxrpc_call_lock);
+	list_add_tail(&call->link, &rxrpc_calls);
+	write_unlock_bh(&rxrpc_call_lock);
+
+	_net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
+
+	_leave(" = %p [new]", call);
+	return call;
+
+	/* we found the call in the list immediately */
+found_extant_call:
+	rxrpc_get_call(call);
+	read_unlock(&rx->call_lock);
+	_leave(" = %p [extant %d]", call, atomic_read(&call->usage));
+	return call;
+
+	/* we found the call on the second time through the list */
+found_extant_second:
+	rxrpc_get_call(call);
+	write_unlock(&rx->call_lock);
+	rxrpc_put_call(candidate);
+	_leave(" = %p [second %d]", call, atomic_read(&call->usage));
+	return call;
+}
+
+/*
+ * set up an incoming call
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx,
+				       struct rxrpc_connection *conn,
+				       struct rxrpc_header *hdr,
+				       gfp_t gfp)
+{
+	struct rxrpc_call *call, *candidate;
+	struct rb_node **p, *parent;
+	__be32 call_id;
+
+	_enter(",%d,,%x", conn->debug_id, gfp);
+
+	ASSERT(rx != NULL);
+
+	candidate = rxrpc_alloc_call(gfp);
+	if (!candidate)
+		return ERR_PTR(-EBUSY);
+
+	candidate->socket = rx;
+	candidate->conn = conn;
+	candidate->cid = hdr->cid;
+	candidate->call_id = hdr->callNumber;
+	candidate->channel = ntohl(hdr->cid) & RXRPC_CHANNELMASK;
+	candidate->rx_data_post = 0;
+	candidate->state = RXRPC_CALL_SERVER_ACCEPTING;
+	if (conn->security_ix > 0)
+		candidate->state = RXRPC_CALL_SERVER_SECURING;
+
+	write_lock_bh(&conn->lock);
+
+	/* set the channel for this call */
+	call = conn->channels[candidate->channel];
+	_debug("channel[%u] is %p", candidate->channel, call);
+	if (call && call->call_id == hdr->callNumber) {
+		/* already set; must've been a duplicate packet */
+		_debug("extant call [%d]", call->state);
+		ASSERTCMP(call->conn, ==, conn);
+
+		read_lock(&call->state_lock);
+		switch (call->state) {
+		case RXRPC_CALL_LOCALLY_ABORTED:
+			if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
+				schedule_work(&call->processor);
+		case RXRPC_CALL_REMOTELY_ABORTED:
+			read_unlock(&call->state_lock);
+			goto aborted_call;
+		default:
+			rxrpc_get_call(call);
+			read_unlock(&call->state_lock);
+			goto extant_call;
+		}
+	}
+
+	if (call) {
+		/* it seems the channel is still in use from the previous call
+		 * - ditch the old binding if its call is now complete */
+		_debug("CALL: %u { %s }",
+		       call->debug_id, rxrpc_call_states[call->state]);
+
+		if (call->state >= RXRPC_CALL_COMPLETE) {
+			conn->channels[call->channel] = NULL;
+		} else {
+			write_unlock_bh(&conn->lock);
+			kmem_cache_free(rxrpc_call_jar, candidate);
+			_leave(" = -EBUSY");
+			return ERR_PTR(-EBUSY);
+		}
+	}
+
+	/* check the call number isn't duplicate */
+	_debug("check dup");
+	call_id = hdr->callNumber;
+	p = &conn->calls.rb_node;
+	parent = NULL;
+	while (*p) {
+		parent = *p;
+		call = rb_entry(parent, struct rxrpc_call, conn_node);
+
+		if (call_id < call->call_id)
+			p = &(*p)->rb_left;
+		else if (call_id > call->call_id)
+			p = &(*p)->rb_right;
+		else
+			goto old_call;
+	}
+
+	/* make the call available */
+	_debug("new call");
+	call = candidate;
+	candidate = NULL;
+	rb_link_node(&call->conn_node, parent, p);
+	rb_insert_color(&call->conn_node, &conn->calls);
+	conn->channels[call->channel] = call;
+	sock_hold(&rx->sk);
+	atomic_inc(&conn->usage);
+	write_unlock_bh(&conn->lock);
+
+	spin_lock(&conn->trans->peer->lock);
+	list_add(&call->error_link, &conn->trans->peer->error_targets);
+	spin_unlock(&conn->trans->peer->lock);
+
+	write_lock_bh(&rxrpc_call_lock);
+	list_add_tail(&call->link, &rxrpc_calls);
+	write_unlock_bh(&rxrpc_call_lock);
+
+	_net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
+
+	call->lifetimer.expires = jiffies + rxrpc_call_max_lifetime * HZ;
+	add_timer(&call->lifetimer);
+	_leave(" = %p {%d} [new]", call, call->debug_id);
+	return call;
+
+extant_call:
+	write_unlock_bh(&conn->lock);
+	kmem_cache_free(rxrpc_call_jar, candidate);
+	_leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1);
+	return call;
+
+aborted_call:
+	write_unlock_bh(&conn->lock);
+	kmem_cache_free(rxrpc_call_jar, candidate);
+	_leave(" = -ECONNABORTED");
+	return ERR_PTR(-ECONNABORTED);
+
+old_call:
+	write_unlock_bh(&conn->lock);
+	kmem_cache_free(rxrpc_call_jar, candidate);
+	_leave(" = -ECONNRESET [old]");
+	return ERR_PTR(-ECONNRESET);
+}
+
+/*
+ * find an extant server call
+ * - called in process context with IRQs enabled
+ */
+struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *rx,
+					  unsigned long user_call_ID)
+{
+	struct rxrpc_call *call;
+	struct rb_node *p;
+
+	_enter("%p,%lx", rx, user_call_ID);
+
+	/* search the extant calls for one that matches the specified user
+	 * ID */
+	read_lock(&rx->call_lock);
+
+	p = rx->calls.rb_node;
+	while (p) {
+		call = rb_entry(p, struct rxrpc_call, sock_node);
+
+		if (user_call_ID < call->user_call_ID)
+			p = p->rb_left;
+		else if (user_call_ID > call->user_call_ID)
+			p = p->rb_right;
+		else
+			goto found_extant_call;
+	}
+
+	read_unlock(&rx->call_lock);
+	_leave(" = NULL");
+	return NULL;
+
+	/* we found the call in the list immediately */
+found_extant_call:
+	rxrpc_get_call(call);
+	read_unlock(&rx->call_lock);
+	_leave(" = %p [%d]", call, atomic_read(&call->usage));
+	return call;
+}
+
+/*
+ * detach a call from a socket and set up for release
+ */
+void rxrpc_release_call(struct rxrpc_call *call)
+{
+	struct rxrpc_sock *rx = call->socket;
+
+	_enter("{%d,%d,%d,%d}",
+	       call->debug_id, atomic_read(&call->usage),
+	       atomic_read(&call->ackr_not_idle),
+	       call->rx_first_oos);
+
+	spin_lock_bh(&call->lock);
+	if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
+		BUG();
+	spin_unlock_bh(&call->lock);
+
+	/* dissociate from the socket
+	 * - the socket's ref on the call is passed to the death timer
+	 */
+	_debug("RELEASE CALL %p (%d CONN %p)",
+	       call, call->debug_id, call->conn);
+
+	write_lock_bh(&rx->call_lock);
+	if (!list_empty(&call->accept_link)) {
+		_debug("unlinking once-pending call %p { e=%lx f=%lx }",
+		       call, call->events, call->flags);
+		ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags));
+		list_del_init(&call->accept_link);
+		sk_acceptq_removed(&rx->sk);
+	} else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
+		rb_erase(&call->sock_node, &rx->calls);
+		memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
+		clear_bit(RXRPC_CALL_HAS_USERID, &call->flags);
+	}
+	write_unlock_bh(&rx->call_lock);
+
+	if (call->conn->out_clientflag)
+		spin_lock(&call->conn->trans->client_lock);
+	write_lock_bh(&call->conn->lock);
+
+	/* free up the channel for reuse */
+	if (call->conn->out_clientflag) {
+		call->conn->avail_calls++;
+		if (call->conn->avail_calls == RXRPC_MAXCALLS)
+			list_move_tail(&call->conn->bundle_link,
+				       &call->conn->bundle->unused_conns);
+		else if (call->conn->avail_calls == 1)
+			list_move_tail(&call->conn->bundle_link,
+				       &call->conn->bundle->avail_conns);
+	}
+
+	write_lock(&call->state_lock);
+	if (call->conn->channels[call->channel] == call)
+		call->conn->channels[call->channel] = NULL;
+
+	if (call->state < RXRPC_CALL_COMPLETE &&
+	    call->state != RXRPC_CALL_CLIENT_FINAL_ACK) {
+		_debug("+++ ABORTING STATE %d +++\n", call->state);
+		call->state = RXRPC_CALL_LOCALLY_ABORTED;
+		call->abort_code = RX_CALL_DEAD;
+		set_bit(RXRPC_CALL_ABORT, &call->events);
+		schedule_work(&call->processor);
+	}
+	write_unlock(&call->state_lock);
+	write_unlock_bh(&call->conn->lock);
+	if (call->conn->out_clientflag)
+		spin_unlock(&call->conn->trans->client_lock);
+
+	if (!skb_queue_empty(&call->rx_queue) ||
+	    !skb_queue_empty(&call->rx_oos_queue)) {
+		struct rxrpc_skb_priv *sp;
+		struct sk_buff *skb;
+
+		_debug("purge Rx queues");
+
+		spin_lock_bh(&call->lock);
+		while ((skb = skb_dequeue(&call->rx_queue)) ||
+		       (skb = skb_dequeue(&call->rx_oos_queue))) {
+			sp = rxrpc_skb(skb);
+			if (sp->call) {
+				ASSERTCMP(sp->call, ==, call);
+				rxrpc_put_call(call);
+				sp->call = NULL;
+			}
+			skb->destructor = NULL;
+			spin_unlock_bh(&call->lock);
+
+			_debug("- zap %s %%%u #%u",
+			       rxrpc_pkts[sp->hdr.type],
+			       ntohl(sp->hdr.serial),
+			       ntohl(sp->hdr.seq));
+			rxrpc_free_skb(skb);
+			spin_lock_bh(&call->lock);
+		}
+		spin_unlock_bh(&call->lock);
+
+		ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE);
+	}
+
+	del_timer_sync(&call->resend_timer);
+	del_timer_sync(&call->ack_timer);
+	del_timer_sync(&call->lifetimer);
+	call->deadspan.expires = jiffies + rxrpc_dead_call_timeout * HZ;
+	add_timer(&call->deadspan);
+
+	_leave("");
+}
+
+/*
+ * handle a dead call being ready for reaping
+ */
+static void rxrpc_dead_call_expired(unsigned long _call)
+{
+	struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+	_enter("{%d}", call->debug_id);
+
+	write_lock_bh(&call->state_lock);
+	call->state = RXRPC_CALL_DEAD;
+	write_unlock_bh(&call->state_lock);
+	rxrpc_put_call(call);
+}
+
+/*
+ * mark a call as to be released, aborting it if it's still in progress
+ * - called with softirqs disabled
+ */
+static void rxrpc_mark_call_released(struct rxrpc_call *call)
+{
+	bool sched;
+
+	write_lock(&call->state_lock);
+	if (call->state < RXRPC_CALL_DEAD) {
+		sched = false;
+		if (call->state < RXRPC_CALL_COMPLETE) {
+			_debug("abort call %p", call);
+			call->state = RXRPC_CALL_LOCALLY_ABORTED;
+			call->abort_code = RX_CALL_DEAD;
+			if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
+				sched = true;
+		}
+		if (!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
+			sched = true;
+		if (sched)
+			schedule_work(&call->processor);
+	}
+	write_unlock(&call->state_lock);
+}
+
+/*
+ * release all the calls associated with a socket
+ */
+void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
+{
+	struct rxrpc_call *call;
+	struct rb_node *p;
+
+	_enter("%p", rx);
+
+	read_lock_bh(&rx->call_lock);
+
+	/* mark all the calls as no longer wanting incoming packets */
+	for (p = rb_first(&rx->calls); p; p = rb_next(p)) {
+		call = rb_entry(p, struct rxrpc_call, sock_node);
+		rxrpc_mark_call_released(call);
+	}
+
+	/* kill the not-yet-accepted incoming calls */
+	list_for_each_entry(call, &rx->secureq, accept_link) {
+		rxrpc_mark_call_released(call);
+	}
+
+	list_for_each_entry(call, &rx->acceptq, accept_link) {
+		rxrpc_mark_call_released(call);
+	}
+
+	read_unlock_bh(&rx->call_lock);
+	_leave("");
+}
+
+/*
+ * release a call
+ */
+void __rxrpc_put_call(struct rxrpc_call *call)
+{
+	ASSERT(call != NULL);
+
+	_enter("%p{u=%d}", call, atomic_read(&call->usage));
+
+	ASSERTCMP(atomic_read(&call->usage), >, 0);
+
+	if (atomic_dec_and_test(&call->usage)) {
+		_debug("call %d dead", call->debug_id);
+		ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+		schedule_work(&call->destroyer);
+	}
+	_leave("");
+}
+
+/*
+ * clean up a call
+ */
+static void rxrpc_cleanup_call(struct rxrpc_call *call)
+{
+	_net("DESTROY CALL %d", call->debug_id);
+
+	ASSERT(call->socket);
+
+	memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
+
+	del_timer_sync(&call->lifetimer);
+	del_timer_sync(&call->deadspan);
+	del_timer_sync(&call->ack_timer);
+	del_timer_sync(&call->resend_timer);
+
+	ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
+	ASSERTCMP(call->events, ==, 0);
+	if (work_pending(&call->processor)) {
+		_debug("defer destroy");
+		schedule_work(&call->destroyer);
+		return;
+	}
+
+	if (call->conn) {
+		spin_lock(&call->conn->trans->peer->lock);
+		list_del(&call->error_link);
+		spin_unlock(&call->conn->trans->peer->lock);
+
+		write_lock_bh(&call->conn->lock);
+		rb_erase(&call->conn_node, &call->conn->calls);
+		write_unlock_bh(&call->conn->lock);
+		rxrpc_put_connection(call->conn);
+	}
+
+	if (call->acks_window) {
+		_debug("kill Tx window %d",
+		       CIRC_CNT(call->acks_head, call->acks_tail,
+				call->acks_winsz));
+		smp_mb();
+		while (CIRC_CNT(call->acks_head, call->acks_tail,
+				call->acks_winsz) > 0) {
+			struct rxrpc_skb_priv *sp;
+			unsigned long _skb;
+
+			_skb = call->acks_window[call->acks_tail] & ~1;
+			sp = rxrpc_skb((struct sk_buff *) _skb);
+			_debug("+++ clear Tx %u", ntohl(sp->hdr.seq));
+			rxrpc_free_skb((struct sk_buff *) _skb);
+			call->acks_tail =
+				(call->acks_tail + 1) & (call->acks_winsz - 1);
+		}
+
+		kfree(call->acks_window);
+	}
+
+	rxrpc_free_skb(call->tx_pending);
+
+	rxrpc_purge_queue(&call->rx_queue);
+	ASSERT(skb_queue_empty(&call->rx_oos_queue));
+	sock_put(&call->socket->sk);
+	kmem_cache_free(rxrpc_call_jar, call);
+}
+
+/*
+ * destroy a call
+ */
+static void rxrpc_destroy_call(struct work_struct *work)
+{
+	struct rxrpc_call *call =
+		container_of(work, struct rxrpc_call, destroyer);
+
+	_enter("%p{%d,%d,%p}",
+	       call, atomic_read(&call->usage), call->channel, call->conn);
+
+	ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+
+	write_lock_bh(&rxrpc_call_lock);
+	list_del_init(&call->link);
+	write_unlock_bh(&rxrpc_call_lock);
+
+	rxrpc_cleanup_call(call);
+	_leave("");
+}
+
+/*
+ * preemptively destroy all the call records from a transport endpoint rather
+ * than waiting for them to time out
+ */
+void __exit rxrpc_destroy_all_calls(void)
+{
+	struct rxrpc_call *call;
+
+	_enter("");
+	write_lock_bh(&rxrpc_call_lock);
+
+	while (!list_empty(&rxrpc_calls)) {
+		call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);
+		_debug("Zapping call %p", call);
+
+		list_del_init(&call->link);
+
+		switch (atomic_read(&call->usage)) {
+		case 0:
+			ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
+			break;
+		case 1:
+			if (del_timer_sync(&call->deadspan) != 0 &&
+			    call->state != RXRPC_CALL_DEAD)
+				rxrpc_dead_call_expired((unsigned long) call);
+			if (call->state != RXRPC_CALL_DEAD)
+				break;
+		default:
+			printk(KERN_ERR "RXRPC:"
+			       " Call %p still in use (%d,%d,%s,%lx,%lx)!\n",
+			       call, atomic_read(&call->usage),
+			       atomic_read(&call->ackr_not_idle),
+			       rxrpc_call_states[call->state],
+			       call->flags, call->events);
+			if (!skb_queue_empty(&call->rx_queue))
+				printk(KERN_ERR"RXRPC: Rx queue occupied\n");
+			if (!skb_queue_empty(&call->rx_oos_queue))
+				printk(KERN_ERR"RXRPC: OOS queue occupied\n");
+			break;
+		}
+
+		write_unlock_bh(&rxrpc_call_lock);
+		cond_resched();
+		write_lock_bh(&rxrpc_call_lock);
+	}
+
+	write_unlock_bh(&rxrpc_call_lock);
+	_leave("");
+}
+
+/*
+ * handle call lifetime being exceeded
+ */
+static void rxrpc_call_life_expired(unsigned long _call)
+{
+	struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+	if (call->state >= RXRPC_CALL_COMPLETE)
+		return;
+
+	_enter("{%d}", call->debug_id);
+	read_lock_bh(&call->state_lock);
+	if (call->state < RXRPC_CALL_COMPLETE) {
+		set_bit(RXRPC_CALL_LIFE_TIMER, &call->events);
+		schedule_work(&call->processor);
+	}
+	read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * handle resend timer expiry
+ */
+static void rxrpc_resend_time_expired(unsigned long _call)
+{
+	struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+	_enter("{%d}", call->debug_id);
+
+	if (call->state >= RXRPC_CALL_COMPLETE)
+		return;
+
+	read_lock_bh(&call->state_lock);
+	clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+	if (call->state < RXRPC_CALL_COMPLETE &&
+	    !test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events))
+		schedule_work(&call->processor);
+	read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * handle ACK timer expiry
+ */
+static void rxrpc_ack_time_expired(unsigned long _call)
+{
+	struct rxrpc_call *call = (struct rxrpc_call *) _call;
+
+	_enter("{%d}", call->debug_id);
+
+	if (call->state >= RXRPC_CALL_COMPLETE)
+		return;
+
+	read_lock_bh(&call->state_lock);
+	if (call->state < RXRPC_CALL_COMPLETE &&
+	    !test_and_set_bit(RXRPC_CALL_ACK, &call->events))
+		schedule_work(&call->processor);
+	read_unlock_bh(&call->state_lock);
+}
diff --git a/net/rxrpc/ar-connection.c b/net/rxrpc/ar-connection.c
new file mode 100644
index 0000000..01eb33c
--- /dev/null
+++ b/net/rxrpc/ar-connection.c
@@ -0,0 +1,895 @@
+/* RxRPC virtual connection handler
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/crypto.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+static void rxrpc_connection_reaper(struct work_struct *work);
+
+LIST_HEAD(rxrpc_connections);
+DEFINE_RWLOCK(rxrpc_connection_lock);
+static unsigned long rxrpc_connection_timeout = 10 * 60;
+static DECLARE_DELAYED_WORK(rxrpc_connection_reap, rxrpc_connection_reaper);
+
+/*
+ * allocate a new client connection bundle
+ */
+static struct rxrpc_conn_bundle *rxrpc_alloc_bundle(gfp_t gfp)
+{
+	struct rxrpc_conn_bundle *bundle;
+
+	_enter("");
+
+	bundle = kzalloc(sizeof(struct rxrpc_conn_bundle), gfp);
+	if (bundle) {
+		INIT_LIST_HEAD(&bundle->unused_conns);
+		INIT_LIST_HEAD(&bundle->avail_conns);
+		INIT_LIST_HEAD(&bundle->busy_conns);
+		init_waitqueue_head(&bundle->chanwait);
+		atomic_set(&bundle->usage, 1);
+	}
+
+	_leave(" = %p", bundle);
+	return bundle;
+}
+
+/*
+ * compare bundle parameters with what we're looking for
+ * - return -ve, 0 or +ve
+ */
+static inline
+int rxrpc_cmp_bundle(const struct rxrpc_conn_bundle *bundle,
+		     struct key *key, __be16 service_id)
+{
+	return (bundle->service_id - service_id) ?:
+		((unsigned long) bundle->key - (unsigned long) key);
+}
+
+/*
+ * get bundle of client connections that a client socket can make use of
+ */
+struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *rx,
+					   struct rxrpc_transport *trans,
+					   struct key *key,
+					   __be16 service_id,
+					   gfp_t gfp)
+{
+	struct rxrpc_conn_bundle *bundle, *candidate;
+	struct rb_node *p, *parent, **pp;
+
+	_enter("%p{%x},%x,%hx,",
+	       rx, key_serial(key), trans->debug_id, ntohl(service_id));
+
+	if (rx->trans == trans && rx->bundle) {
+		atomic_inc(&rx->bundle->usage);
+		return rx->bundle;
+	}
+
+	/* search the extant bundles first for one that matches the specified
+	 * user ID */
+	spin_lock(&trans->client_lock);
+
+	p = trans->bundles.rb_node;
+	while (p) {
+		bundle = rb_entry(p, struct rxrpc_conn_bundle, node);
+
+		if (rxrpc_cmp_bundle(bundle, key, service_id) < 0)
+			p = p->rb_left;
+		else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0)
+			p = p->rb_right;
+		else
+			goto found_extant_bundle;
+	}
+
+	spin_unlock(&trans->client_lock);
+
+	/* not yet present - create a candidate for a new record and then
+	 * redo the search */
+	candidate = rxrpc_alloc_bundle(gfp);
+	if (!candidate) {
+		_leave(" = -ENOMEM");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	candidate->key = key_get(key);
+	candidate->service_id = service_id;
+
+	spin_lock(&trans->client_lock);
+
+	pp = &trans->bundles.rb_node;
+	parent = NULL;
+	while (*pp) {
+		parent = *pp;
+		bundle = rb_entry(parent, struct rxrpc_conn_bundle, node);
+
+		if (rxrpc_cmp_bundle(bundle, key, service_id) < 0)
+			pp = &(*pp)->rb_left;
+		else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0)
+			pp = &(*pp)->rb_right;
+		else
+			goto found_extant_second;
+	}
+
+	/* second search also failed; add the new bundle */
+	bundle = candidate;
+	candidate = NULL;
+
+	rb_link_node(&bundle->node, parent, pp);
+	rb_insert_color(&bundle->node, &trans->bundles);
+	spin_unlock(&trans->client_lock);
+	_net("BUNDLE new on trans %d", trans->debug_id);
+	if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) {
+		atomic_inc(&bundle->usage);
+		rx->bundle = bundle;
+	}
+	_leave(" = %p [new]", bundle);
+	return bundle;
+
+	/* we found the bundle in the list immediately */
+found_extant_bundle:
+	atomic_inc(&bundle->usage);
+	spin_unlock(&trans->client_lock);
+	_net("BUNDLE old on trans %d", trans->debug_id);
+	if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) {
+		atomic_inc(&bundle->usage);
+		rx->bundle = bundle;
+	}
+	_leave(" = %p [extant %d]", bundle, atomic_read(&bundle->usage));
+	return bundle;
+
+	/* we found the bundle on the second time through the list */
+found_extant_second:
+	atomic_inc(&bundle->usage);
+	spin_unlock(&trans->client_lock);
+	kfree(candidate);
+	_net("BUNDLE old2 on trans %d", trans->debug_id);
+	if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) {
+		atomic_inc(&bundle->usage);
+		rx->bundle = bundle;
+	}
+	_leave(" = %p [second %d]", bundle, atomic_read(&bundle->usage));
+	return bundle;
+}
+
+/*
+ * release a bundle
+ */
+void rxrpc_put_bundle(struct rxrpc_transport *trans,
+		      struct rxrpc_conn_bundle *bundle)
+{
+	_enter("%p,%p{%d}",trans, bundle, atomic_read(&bundle->usage));
+
+	if (atomic_dec_and_lock(&bundle->usage, &trans->client_lock)) {
+		_debug("Destroy bundle");
+		rb_erase(&bundle->node, &trans->bundles);
+		spin_unlock(&trans->client_lock);
+		ASSERT(list_empty(&bundle->unused_conns));
+		ASSERT(list_empty(&bundle->avail_conns));
+		ASSERT(list_empty(&bundle->busy_conns));
+		ASSERTCMP(bundle->num_conns, ==, 0);
+		key_put(bundle->key);
+		kfree(bundle);
+	}
+
+	_leave("");
+}
+
+/*
+ * allocate a new connection
+ */
+static struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp)
+{
+	struct rxrpc_connection *conn;
+
+	_enter("");
+
+	conn = kzalloc(sizeof(struct rxrpc_connection), gfp);
+	if (conn) {
+		INIT_WORK(&conn->processor, &rxrpc_process_connection);
+		INIT_LIST_HEAD(&conn->bundle_link);
+		conn->calls = RB_ROOT;
+		skb_queue_head_init(&conn->rx_queue);
+		rwlock_init(&conn->lock);
+		spin_lock_init(&conn->state_lock);
+		atomic_set(&conn->usage, 1);
+		conn->debug_id = atomic_inc_return(&rxrpc_debug_id);
+		conn->avail_calls = RXRPC_MAXCALLS;
+		conn->size_align = 4;
+		conn->header_size = sizeof(struct rxrpc_header);
+	}
+
+	_leave(" = %p{%d}", conn, conn->debug_id);
+	return conn;
+}
+
+/*
+ * assign a connection ID to a connection and add it to the transport's
+ * connection lookup tree
+ * - called with transport client lock held
+ */
+static void rxrpc_assign_connection_id(struct rxrpc_connection *conn)
+{
+	struct rxrpc_connection *xconn;
+	struct rb_node *parent, **p;
+	__be32 epoch;
+	u32 real_conn_id;
+
+	_enter("");
+
+	epoch = conn->epoch;
+
+	write_lock_bh(&conn->trans->conn_lock);
+
+	conn->trans->conn_idcounter += RXRPC_CID_INC;
+	if (conn->trans->conn_idcounter < RXRPC_CID_INC)
+		conn->trans->conn_idcounter = RXRPC_CID_INC;
+	real_conn_id = conn->trans->conn_idcounter;
+
+attempt_insertion:
+	parent = NULL;
+	p = &conn->trans->client_conns.rb_node;
+
+	while (*p) {
+		parent = *p;
+		xconn = rb_entry(parent, struct rxrpc_connection, node);
+
+		if (epoch < xconn->epoch)
+			p = &(*p)->rb_left;
+		else if (epoch > xconn->epoch)
+			p = &(*p)->rb_right;
+		else if (real_conn_id < xconn->real_conn_id)
+			p = &(*p)->rb_left;
+		else if (real_conn_id > xconn->real_conn_id)
+			p = &(*p)->rb_right;
+		else
+			goto id_exists;
+	}
+
+	/* we've found a suitable hole - arrange for this connection to occupy
+	 * it */
+	rb_link_node(&conn->node, parent, p);
+	rb_insert_color(&conn->node, &conn->trans->client_conns);
+
+	conn->real_conn_id = real_conn_id;
+	conn->cid = htonl(real_conn_id);
+	write_unlock_bh(&conn->trans->conn_lock);
+	_leave(" [CONNID %x CID %x]", real_conn_id, ntohl(conn->cid));
+	return;
+
+	/* we found a connection with the proposed ID - walk the tree from that
+	 * point looking for the next unused ID */
+id_exists:
+	for (;;) {
+		real_conn_id += RXRPC_CID_INC;
+		if (real_conn_id < RXRPC_CID_INC) {
+			real_conn_id = RXRPC_CID_INC;
+			conn->trans->conn_idcounter = real_conn_id;
+			goto attempt_insertion;
+		}
+
+		parent = rb_next(parent);
+		if (!parent)
+			goto attempt_insertion;
+
+		xconn = rb_entry(parent, struct rxrpc_connection, node);
+		if (epoch < xconn->epoch ||
+		    real_conn_id < xconn->real_conn_id)
+			goto attempt_insertion;
+	}
+}
+
+/*
+ * add a call to a connection's call-by-ID tree
+ */
+static void rxrpc_add_call_ID_to_conn(struct rxrpc_connection *conn,
+				      struct rxrpc_call *call)
+{
+	struct rxrpc_call *xcall;
+	struct rb_node *parent, **p;
+	__be32 call_id;
+
+	write_lock_bh(&conn->lock);
+
+	call_id = call->call_id;
+	p = &conn->calls.rb_node;
+	parent = NULL;
+	while (*p) {
+		parent = *p;
+		xcall = rb_entry(parent, struct rxrpc_call, conn_node);
+
+		if (call_id < xcall->call_id)
+			p = &(*p)->rb_left;
+		else if (call_id > xcall->call_id)
+			p = &(*p)->rb_right;
+		else
+			BUG();
+	}
+
+	rb_link_node(&call->conn_node, parent, p);
+	rb_insert_color(&call->conn_node, &conn->calls);
+
+	write_unlock_bh(&conn->lock);
+}
+
+/*
+ * connect a call on an exclusive connection
+ */
+static int rxrpc_connect_exclusive(struct rxrpc_sock *rx,
+				   struct rxrpc_transport *trans,
+				   __be16 service_id,
+				   struct rxrpc_call *call,
+				   gfp_t gfp)
+{
+	struct rxrpc_connection *conn;
+	int chan, ret;
+
+	_enter("");
+
+	conn = rx->conn;
+	if (!conn) {
+		/* not yet present - create a candidate for a new connection
+		 * and then redo the check */
+		conn = rxrpc_alloc_connection(gfp);
+		if (IS_ERR(conn)) {
+			_leave(" = %ld", PTR_ERR(conn));
+			return PTR_ERR(conn);
+		}
+
+		conn->trans = trans;
+		conn->bundle = NULL;
+		conn->service_id = service_id;
+		conn->epoch = rxrpc_epoch;
+		conn->in_clientflag = 0;
+		conn->out_clientflag = RXRPC_CLIENT_INITIATED;
+		conn->cid = 0;
+		conn->state = RXRPC_CONN_CLIENT;
+		conn->avail_calls = RXRPC_MAXCALLS;
+		conn->security_level = rx->min_sec_level;
+		conn->key = key_get(rx->key);
+
+		ret = rxrpc_init_client_conn_security(conn);
+		if (ret < 0) {
+			key_put(conn->key);
+			kfree(conn);
+			_leave(" = %d [key]", ret);
+			return ret;
+		}
+
+		write_lock_bh(&rxrpc_connection_lock);
+		list_add_tail(&conn->link, &rxrpc_connections);
+		write_unlock_bh(&rxrpc_connection_lock);
+
+		spin_lock(&trans->client_lock);
+		atomic_inc(&trans->usage);
+
+		_net("CONNECT EXCL new %d on TRANS %d",
+		     conn->debug_id, conn->trans->debug_id);
+
+		rxrpc_assign_connection_id(conn);
+		rx->conn = conn;
+	}
+
+	/* we've got a connection with a free channel and we can now attach the
+	 * call to it
+	 * - we're holding the transport's client lock
+	 * - we're holding a reference on the connection
+	 */
+	for (chan = 0; chan < RXRPC_MAXCALLS; chan++)
+		if (!conn->channels[chan])
+			goto found_channel;
+	goto no_free_channels;
+
+found_channel:
+	atomic_inc(&conn->usage);
+	conn->channels[chan] = call;
+	call->conn = conn;
+	call->channel = chan;
+	call->cid = conn->cid | htonl(chan);
+	call->call_id = htonl(++conn->call_counter);
+
+	_net("CONNECT client on conn %d chan %d as call %x",
+	     conn->debug_id, chan, ntohl(call->call_id));
+
+	spin_unlock(&trans->client_lock);
+
+	rxrpc_add_call_ID_to_conn(conn, call);
+	_leave(" = 0");
+	return 0;
+
+no_free_channels:
+	spin_unlock(&trans->client_lock);
+	_leave(" = -ENOSR");
+	return -ENOSR;
+}
+
+/*
+ * find a connection for a call
+ * - called in process context with IRQs enabled
+ */
+int rxrpc_connect_call(struct rxrpc_sock *rx,
+		       struct rxrpc_transport *trans,
+		       struct rxrpc_conn_bundle *bundle,
+		       struct rxrpc_call *call,
+		       gfp_t gfp)
+{
+	struct rxrpc_connection *conn, *candidate;
+	int chan, ret;
+
+	DECLARE_WAITQUEUE(myself, current);
+
+	_enter("%p,%lx,", rx, call->user_call_ID);
+
+	if (test_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags))
+		return rxrpc_connect_exclusive(rx, trans, bundle->service_id,
+					       call, gfp);
+
+	spin_lock(&trans->client_lock);
+	for (;;) {
+		/* see if the bundle has a call slot available */
+		if (!list_empty(&bundle->avail_conns)) {
+			_debug("avail");
+			conn = list_entry(bundle->avail_conns.next,
+					  struct rxrpc_connection,
+					  bundle_link);
+			if (--conn->avail_calls == 0)
+				list_move(&conn->bundle_link,
+					  &bundle->busy_conns);
+			atomic_inc(&conn->usage);
+			break;
+		}
+
+		if (!list_empty(&bundle->unused_conns)) {
+			_debug("unused");
+			conn = list_entry(bundle->unused_conns.next,
+					  struct rxrpc_connection,
+					  bundle_link);
+			atomic_inc(&conn->usage);
+			list_move(&conn->bundle_link, &bundle->avail_conns);
+			break;
+		}
+
+		/* need to allocate a new connection */
+		_debug("get new conn [%d]", bundle->num_conns);
+
+		spin_unlock(&trans->client_lock);
+
+		if (signal_pending(current))
+			goto interrupted;
+
+		if (bundle->num_conns >= 20) {
+			_debug("too many conns");
+
+			if (!(gfp & __GFP_WAIT)) {
+				_leave(" = -EAGAIN");
+				return -EAGAIN;
+			}
+
+			add_wait_queue(&bundle->chanwait, &myself);
+			for (;;) {
+				set_current_state(TASK_INTERRUPTIBLE);
+				if (bundle->num_conns < 20 ||
+				    !list_empty(&bundle->unused_conns) ||
+				    !list_empty(&bundle->avail_conns))
+					break;
+				if (signal_pending(current))
+					goto interrupted_dequeue;
+				schedule();
+			}
+			remove_wait_queue(&bundle->chanwait, &myself);
+			__set_current_state(TASK_RUNNING);
+			spin_lock(&trans->client_lock);
+			continue;
+		}
+
+		/* not yet present - create a candidate for a new connection and then
+		 * redo the check */
+		candidate = rxrpc_alloc_connection(gfp);
+		if (IS_ERR(candidate)) {
+			_leave(" = %ld", PTR_ERR(candidate));
+			return PTR_ERR(candidate);
+		}
+
+		candidate->trans = trans;
+		candidate->bundle = bundle;
+		candidate->service_id = bundle->service_id;
+		candidate->epoch = rxrpc_epoch;
+		candidate->in_clientflag = 0;
+		candidate->out_clientflag = RXRPC_CLIENT_INITIATED;
+		candidate->cid = 0;
+		candidate->state = RXRPC_CONN_CLIENT;
+		candidate->avail_calls = RXRPC_MAXCALLS;
+		candidate->security_level = rx->min_sec_level;
+		candidate->key = key_get(rx->key);
+
+		ret = rxrpc_init_client_conn_security(candidate);
+		if (ret < 0) {
+			key_put(candidate->key);
+			kfree(candidate);
+			_leave(" = %d [key]", ret);
+			return ret;
+		}
+
+		write_lock_bh(&rxrpc_connection_lock);
+		list_add_tail(&candidate->link, &rxrpc_connections);
+		write_unlock_bh(&rxrpc_connection_lock);
+
+		spin_lock(&trans->client_lock);
+
+		list_add(&candidate->bundle_link, &bundle->unused_conns);
+		bundle->num_conns++;
+		atomic_inc(&bundle->usage);
+		atomic_inc(&trans->usage);
+
+		_net("CONNECT new %d on TRANS %d",
+		     candidate->debug_id, candidate->trans->debug_id);
+
+		rxrpc_assign_connection_id(candidate);
+		if (candidate->security)
+			candidate->security->prime_packet_security(candidate);
+
+		/* leave the candidate lurking in zombie mode attached to the
+		 * bundle until we're ready for it */
+		rxrpc_put_connection(candidate);
+		candidate = NULL;
+	}
+
+	/* we've got a connection with a free channel and we can now attach the
+	 * call to it
+	 * - we're holding the transport's client lock
+	 * - we're holding a reference on the connection
+	 * - we're holding a reference on the bundle
+	 */
+	for (chan = 0; chan < RXRPC_MAXCALLS; chan++)
+		if (!conn->channels[chan])
+			goto found_channel;
+	BUG();
+
+found_channel:
+	conn->channels[chan] = call;
+	call->conn = conn;
+	call->channel = chan;
+	call->cid = conn->cid | htonl(chan);
+	call->call_id = htonl(++conn->call_counter);
+
+	_net("CONNECT client on conn %d chan %d as call %x",
+	     conn->debug_id, chan, ntohl(call->call_id));
+
+	spin_unlock(&trans->client_lock);
+
+	rxrpc_add_call_ID_to_conn(conn, call);
+
+	_leave(" = 0");
+	return 0;
+
+interrupted_dequeue:
+	remove_wait_queue(&bundle->chanwait, &myself);
+	__set_current_state(TASK_RUNNING);
+interrupted:
+	_leave(" = -ERESTARTSYS");
+	return -ERESTARTSYS;
+}
+
+/*
+ * get a record of an incoming connection
+ */
+struct rxrpc_connection *
+rxrpc_incoming_connection(struct rxrpc_transport *trans,
+			  struct rxrpc_header *hdr,
+			  gfp_t gfp)
+{
+	struct rxrpc_connection *conn, *candidate = NULL;
+	struct rb_node *p, **pp;
+	const char *new = "old";
+	__be32 epoch;
+	u32 conn_id;
+
+	_enter("");
+
+	ASSERT(hdr->flags & RXRPC_CLIENT_INITIATED);
+
+	epoch = hdr->epoch;
+	conn_id = ntohl(hdr->cid) & RXRPC_CIDMASK;
+
+	/* search the connection list first */
+	read_lock_bh(&trans->conn_lock);
+
+	p = trans->server_conns.rb_node;
+	while (p) {
+		conn = rb_entry(p, struct rxrpc_connection, node);
+
+		_debug("maybe %x", conn->real_conn_id);
+
+		if (epoch < conn->epoch)
+			p = p->rb_left;
+		else if (epoch > conn->epoch)
+			p = p->rb_right;
+		else if (conn_id < conn->real_conn_id)
+			p = p->rb_left;
+		else if (conn_id > conn->real_conn_id)
+			p = p->rb_right;
+		else
+			goto found_extant_connection;
+	}
+	read_unlock_bh(&trans->conn_lock);
+
+	/* not yet present - create a candidate for a new record and then
+	 * redo the search */
+	candidate = rxrpc_alloc_connection(gfp);
+	if (!candidate) {
+		_leave(" = -ENOMEM");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	candidate->trans = trans;
+	candidate->epoch = hdr->epoch;
+	candidate->cid = hdr->cid & __constant_cpu_to_be32(RXRPC_CIDMASK);
+	candidate->service_id = hdr->serviceId;
+	candidate->security_ix = hdr->securityIndex;
+	candidate->in_clientflag = RXRPC_CLIENT_INITIATED;
+	candidate->out_clientflag = 0;
+	candidate->real_conn_id = conn_id;
+	candidate->state = RXRPC_CONN_SERVER;
+	if (candidate->service_id)
+		candidate->state = RXRPC_CONN_SERVER_UNSECURED;
+
+	write_lock_bh(&trans->conn_lock);
+
+	pp = &trans->server_conns.rb_node;
+	p = NULL;
+	while (*pp) {
+		p = *pp;
+		conn = rb_entry(p, struct rxrpc_connection, node);
+
+		if (epoch < conn->epoch)
+			pp = &(*pp)->rb_left;
+		else if (epoch > conn->epoch)
+			pp = &(*pp)->rb_right;
+		else if (conn_id < conn->real_conn_id)
+			pp = &(*pp)->rb_left;
+		else if (conn_id > conn->real_conn_id)
+			pp = &(*pp)->rb_right;
+		else
+			goto found_extant_second;
+	}
+
+	/* we can now add the new candidate to the list */
+	conn = candidate;
+	candidate = NULL;
+	rb_link_node(&conn->node, p, pp);
+	rb_insert_color(&conn->node, &trans->server_conns);
+	atomic_inc(&conn->trans->usage);
+
+	write_unlock_bh(&trans->conn_lock);
+
+	write_lock_bh(&rxrpc_connection_lock);
+	list_add_tail(&conn->link, &rxrpc_connections);
+	write_unlock_bh(&rxrpc_connection_lock);
+
+	new = "new";
+
+success:
+	_net("CONNECTION %s %d {%x}", new, conn->debug_id, conn->real_conn_id);
+
+	_leave(" = %p {u=%d}", conn, atomic_read(&conn->usage));
+	return conn;
+
+	/* we found the connection in the list immediately */
+found_extant_connection:
+	if (hdr->securityIndex != conn->security_ix) {
+		read_unlock_bh(&trans->conn_lock);
+		goto security_mismatch;
+	}
+	atomic_inc(&conn->usage);
+	read_unlock_bh(&trans->conn_lock);
+	goto success;
+
+	/* we found the connection on the second time through the list */
+found_extant_second:
+	if (hdr->securityIndex != conn->security_ix) {
+		write_unlock_bh(&trans->conn_lock);
+		goto security_mismatch;
+	}
+	atomic_inc(&conn->usage);
+	write_unlock_bh(&trans->conn_lock);
+	kfree(candidate);
+	goto success;
+
+security_mismatch:
+	kfree(candidate);
+	_leave(" = -EKEYREJECTED");
+	return ERR_PTR(-EKEYREJECTED);
+}
+
+/*
+ * find a connection based on transport and RxRPC connection ID for an incoming
+ * packet
+ */
+struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *trans,
+					       struct rxrpc_header *hdr)
+{
+	struct rxrpc_connection *conn;
+	struct rb_node *p;
+	__be32 epoch;
+	u32 conn_id;
+
+	_enter(",{%x,%x}", ntohl(hdr->cid), hdr->flags);
+
+	read_lock_bh(&trans->conn_lock);
+
+	conn_id = ntohl(hdr->cid) & RXRPC_CIDMASK;
+	epoch = hdr->epoch;
+
+	if (hdr->flags & RXRPC_CLIENT_INITIATED)
+		p = trans->server_conns.rb_node;
+	else
+		p = trans->client_conns.rb_node;
+
+	while (p) {
+		conn = rb_entry(p, struct rxrpc_connection, node);
+
+		_debug("maybe %x", conn->real_conn_id);
+
+		if (epoch < conn->epoch)
+			p = p->rb_left;
+		else if (epoch > conn->epoch)
+			p = p->rb_right;
+		else if (conn_id < conn->real_conn_id)
+			p = p->rb_left;
+		else if (conn_id > conn->real_conn_id)
+			p = p->rb_right;
+		else
+			goto found;
+	}
+
+	read_unlock_bh(&trans->conn_lock);
+	_leave(" = NULL");
+	return NULL;
+
+found:
+	atomic_inc(&conn->usage);
+	read_unlock_bh(&trans->conn_lock);
+	_leave(" = %p", conn);
+	return conn;
+}
+
+/*
+ * release a virtual connection
+ */
+void rxrpc_put_connection(struct rxrpc_connection *conn)
+{
+	_enter("%p{u=%d,d=%d}",
+	       conn, atomic_read(&conn->usage), conn->debug_id);
+
+	ASSERTCMP(atomic_read(&conn->usage), >, 0);
+
+	conn->put_time = xtime.tv_sec;
+	if (atomic_dec_and_test(&conn->usage)) {
+		_debug("zombie");
+		schedule_delayed_work(&rxrpc_connection_reap, 0);
+	}
+
+	_leave("");
+}
+
+/*
+ * destroy a virtual connection
+ */
+static void rxrpc_destroy_connection(struct rxrpc_connection *conn)
+{
+	_enter("%p{%d}", conn, atomic_read(&conn->usage));
+
+	ASSERTCMP(atomic_read(&conn->usage), ==, 0);
+
+	_net("DESTROY CONN %d", conn->debug_id);
+
+	if (conn->bundle)
+		rxrpc_put_bundle(conn->trans, conn->bundle);
+
+	ASSERT(RB_EMPTY_ROOT(&conn->calls));
+	rxrpc_purge_queue(&conn->rx_queue);
+
+	rxrpc_clear_conn_security(conn);
+	rxrpc_put_transport(conn->trans);
+	kfree(conn);
+	_leave("");
+}
+
+/*
+ * reap dead connections
+ */
+void rxrpc_connection_reaper(struct work_struct *work)
+{
+	struct rxrpc_connection *conn, *_p;
+	unsigned long now, earliest, reap_time;
+
+	LIST_HEAD(graveyard);
+
+	_enter("");
+
+	now = xtime.tv_sec;
+	earliest = ULONG_MAX;
+
+	write_lock_bh(&rxrpc_connection_lock);
+	list_for_each_entry_safe(conn, _p, &rxrpc_connections, link) {
+		_debug("reap CONN %d { u=%d,t=%ld }",
+		       conn->debug_id, atomic_read(&conn->usage),
+		       (long) now - (long) conn->put_time);
+
+		if (likely(atomic_read(&conn->usage) > 0))
+			continue;
+
+		spin_lock(&conn->trans->client_lock);
+		write_lock(&conn->trans->conn_lock);
+		reap_time = conn->put_time + rxrpc_connection_timeout;
+
+		if (atomic_read(&conn->usage) > 0) {
+			;
+		} else if (reap_time <= now) {
+			list_move_tail(&conn->link, &graveyard);
+			if (conn->out_clientflag)
+				rb_erase(&conn->node,
+					 &conn->trans->client_conns);
+			else
+				rb_erase(&conn->node,
+					 &conn->trans->server_conns);
+			if (conn->bundle) {
+				list_del_init(&conn->bundle_link);
+				conn->bundle->num_conns--;
+			}
+
+		} else if (reap_time < earliest) {
+			earliest = reap_time;
+		}
+
+		write_unlock(&conn->trans->conn_lock);
+		spin_unlock(&conn->trans->client_lock);
+	}
+	write_unlock_bh(&rxrpc_connection_lock);
+
+	if (earliest != ULONG_MAX) {
+		_debug("reschedule reaper %ld", (long) earliest - now);
+		ASSERTCMP(earliest, >, now);
+		schedule_delayed_work(&rxrpc_connection_reap,
+				      (earliest - now) * HZ);
+	}
+
+	/* then destroy all those pulled out */
+	while (!list_empty(&graveyard)) {
+		conn = list_entry(graveyard.next, struct rxrpc_connection,
+				  link);
+		list_del_init(&conn->link);
+
+		ASSERTCMP(atomic_read(&conn->usage), ==, 0);
+		rxrpc_destroy_connection(conn);
+	}
+
+	_leave("");
+}
+
+/*
+ * preemptively destroy all the connection records rather than waiting for them
+ * to time out
+ */
+void __exit rxrpc_destroy_all_connections(void)
+{
+	_enter("");
+
+	rxrpc_connection_timeout = 0;
+	cancel_delayed_work(&rxrpc_connection_reap);
+	schedule_delayed_work(&rxrpc_connection_reap, 0);
+
+	_leave("");
+}
diff --git a/net/rxrpc/ar-connevent.c b/net/rxrpc/ar-connevent.c
new file mode 100644
index 0000000..4b02815
--- /dev/null
+++ b/net/rxrpc/ar-connevent.c
@@ -0,0 +1,387 @@
+/* connection-level event handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+/*
+ * pass a connection-level abort onto all calls on that connection
+ */
+static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state,
+			      u32 abort_code)
+{
+	struct rxrpc_call *call;
+	struct rb_node *p;
+
+	_enter("{%d},%x", conn->debug_id, abort_code);
+
+	read_lock_bh(&conn->lock);
+
+	for (p = rb_first(&conn->calls); p; p = rb_next(p)) {
+		call = rb_entry(p, struct rxrpc_call, conn_node);
+		write_lock(&call->state_lock);
+		if (call->state <= RXRPC_CALL_COMPLETE) {
+			call->state = state;
+			call->abort_code = abort_code;
+			if (state == RXRPC_CALL_LOCALLY_ABORTED)
+				set_bit(RXRPC_CALL_CONN_ABORT, &call->events);
+			else
+				set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
+			schedule_work(&call->processor);
+		}
+		write_unlock(&call->state_lock);
+	}
+
+	read_unlock_bh(&conn->lock);
+	_leave("");
+}
+
+/*
+ * generate a connection-level abort
+ */
+static int rxrpc_abort_connection(struct rxrpc_connection *conn,
+				  u32 error, u32 abort_code)
+{
+	struct rxrpc_header hdr;
+	struct msghdr msg;
+	struct kvec iov[2];
+	__be32 word;
+	size_t len;
+	int ret;
+
+	_enter("%d,,%u,%u", conn->debug_id, error, abort_code);
+
+	/* generate a connection-level abort */
+	spin_lock_bh(&conn->state_lock);
+	if (conn->state < RXRPC_CONN_REMOTELY_ABORTED) {
+		conn->state = RXRPC_CONN_LOCALLY_ABORTED;
+		conn->error = error;
+		spin_unlock_bh(&conn->state_lock);
+	} else {
+		spin_unlock_bh(&conn->state_lock);
+		_leave(" = 0 [already dead]");
+		return 0;
+	}
+
+	rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code);
+
+	msg.msg_name	= &conn->trans->peer->srx.transport.sin;
+	msg.msg_namelen	= sizeof(conn->trans->peer->srx.transport.sin);
+	msg.msg_control	= NULL;
+	msg.msg_controllen = 0;
+	msg.msg_flags	= 0;
+
+	hdr.epoch	= conn->epoch;
+	hdr.cid		= conn->cid;
+	hdr.callNumber	= 0;
+	hdr.seq		= 0;
+	hdr.type	= RXRPC_PACKET_TYPE_ABORT;
+	hdr.flags	= conn->out_clientflag;
+	hdr.userStatus	= 0;
+	hdr.securityIndex = conn->security_ix;
+	hdr._rsvd	= 0;
+	hdr.serviceId	= conn->service_id;
+
+	word = htonl(abort_code);
+
+	iov[0].iov_base	= &hdr;
+	iov[0].iov_len	= sizeof(hdr);
+	iov[1].iov_base	= &word;
+	iov[1].iov_len	= sizeof(word);
+
+	len = iov[0].iov_len + iov[1].iov_len;
+
+	hdr.serial = htonl(atomic_inc_return(&conn->serial));
+	_proto("Tx CONN ABORT %%%u { %d }", ntohl(hdr.serial), abort_code);
+
+	ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 2, len);
+	if (ret < 0) {
+		_debug("sendmsg failed: %d", ret);
+		return -EAGAIN;
+	}
+
+	_leave(" = 0");
+	return 0;
+}
+
+/*
+ * mark a call as being on a now-secured channel
+ * - must be called with softirqs disabled
+ */
+void rxrpc_call_is_secure(struct rxrpc_call *call)
+{
+	_enter("%p", call);
+	if (call) {
+		read_lock(&call->state_lock);
+		if (call->state < RXRPC_CALL_COMPLETE &&
+		    !test_and_set_bit(RXRPC_CALL_SECURED, &call->events))
+			schedule_work(&call->processor);
+		read_unlock(&call->state_lock);
+	}
+}
+
+/*
+ * connection-level Rx packet processor
+ */
+static int rxrpc_process_event(struct rxrpc_connection *conn,
+			       struct sk_buff *skb,
+			       u32 *_abort_code)
+{
+	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+	__be32 tmp;
+	u32 serial;
+	int loop, ret;
+
+	if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED)
+		return -ECONNABORTED;
+
+	serial = ntohl(sp->hdr.serial);
+
+	switch (sp->hdr.type) {
+	case RXRPC_PACKET_TYPE_ABORT:
+		if (skb_copy_bits(skb, 0, &tmp, sizeof(tmp)) < 0)
+			return -EPROTO;
+		_proto("Rx ABORT %%%u { ac=%d }", serial, ntohl(tmp));
+
+		conn->state = RXRPC_CONN_REMOTELY_ABORTED;
+		rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
+				  ntohl(tmp));
+		return -ECONNABORTED;
+
+	case RXRPC_PACKET_TYPE_CHALLENGE:
+		if (conn->security)
+			return conn->security->respond_to_challenge(
+				conn, skb, _abort_code);
+		return -EPROTO;
+
+	case RXRPC_PACKET_TYPE_RESPONSE:
+		if (!conn->security)
+			return -EPROTO;
+
+		ret = conn->security->verify_response(conn, skb, _abort_code);
+		if (ret < 0)
+			return ret;
+
+		ret = conn->security->init_connection_security(conn);
+		if (ret < 0)
+			return ret;
+
+		conn->security->prime_packet_security(conn);
+		read_lock_bh(&conn->lock);
+		spin_lock(&conn->state_lock);
+
+		if (conn->state == RXRPC_CONN_SERVER_CHALLENGING) {
+			conn->state = RXRPC_CONN_SERVER;
+			for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
+				rxrpc_call_is_secure(conn->channels[loop]);
+		}
+
+		spin_unlock(&conn->state_lock);
+		read_unlock_bh(&conn->lock);
+		return 0;
+
+	default:
+		return -EPROTO;
+	}
+}
+
+/*
+ * set up security and issue a challenge
+ */
+static void rxrpc_secure_connection(struct rxrpc_connection *conn)
+{
+	u32 abort_code;
+	int ret;
+
+	_enter("{%d}", conn->debug_id);
+
+	ASSERT(conn->security_ix != 0);
+
+	if (!conn->key) {
+		_debug("set up security");
+		ret = rxrpc_init_server_conn_security(conn);
+		switch (ret) {
+		case 0:
+			break;
+		case -ENOENT:
+			abort_code = RX_CALL_DEAD;
+			goto abort;
+		default:
+			abort_code = RXKADNOAUTH;
+			goto abort;
+		}
+	}
+
+	ASSERT(conn->security != NULL);
+
+	if (conn->security->issue_challenge(conn) < 0) {
+		abort_code = RX_CALL_DEAD;
+		ret = -ENOMEM;
+		goto abort;
+	}
+
+	_leave("");
+	return;
+
+abort:
+	_debug("abort %d, %d", ret, abort_code);
+	rxrpc_abort_connection(conn, -ret, abort_code);
+	_leave(" [aborted]");
+}
+
+/*
+ * connection-level event processor
+ */
+void rxrpc_process_connection(struct work_struct *work)
+{
+	struct rxrpc_connection *conn =
+		container_of(work, struct rxrpc_connection, processor);
+	struct rxrpc_skb_priv *sp;
+	struct sk_buff *skb;
+	u32 abort_code = RX_PROTOCOL_ERROR;
+	int ret;
+
+	_enter("{%d}", conn->debug_id);
+
+	atomic_inc(&conn->usage);
+
+	if (test_and_clear_bit(RXRPC_CONN_CHALLENGE, &conn->events)) {
+		rxrpc_secure_connection(conn);
+		rxrpc_put_connection(conn);
+	}
+
+	/* go through the conn-level event packets, releasing the ref on this
+	 * connection that each one has when we've finished with it */
+	while ((skb = skb_dequeue(&conn->rx_queue))) {
+		sp = rxrpc_skb(skb);
+
+		ret = rxrpc_process_event(conn, skb, &abort_code);
+		switch (ret) {
+		case -EPROTO:
+		case -EKEYEXPIRED:
+		case -EKEYREJECTED:
+			goto protocol_error;
+		case -EAGAIN:
+			goto requeue_and_leave;
+		case -ECONNABORTED:
+		default:
+			rxrpc_put_connection(conn);
+			rxrpc_free_skb(skb);
+			break;
+		}
+	}
+
+out:
+	rxrpc_put_connection(conn);
+	_leave("");
+	return;
+
+requeue_and_leave:
+	skb_queue_head(&conn->rx_queue, skb);
+	goto out;
+
+protocol_error:
+	if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
+		goto requeue_and_leave;
+	rxrpc_put_connection(conn);
+	rxrpc_free_skb(skb);
+	_leave(" [EPROTO]");
+	goto out;
+}
+
+/*
+ * reject packets through the local endpoint
+ */
+void rxrpc_reject_packets(struct work_struct *work)
+{
+	union {
+		struct sockaddr sa;
+		struct sockaddr_in sin;
+	} sa;
+	struct rxrpc_skb_priv *sp;
+	struct rxrpc_header hdr;
+	struct rxrpc_local *local;
+	struct sk_buff *skb;
+	struct msghdr msg;
+	struct kvec iov[2];
+	size_t size;
+	__be32 code;
+
+	local = container_of(work, struct rxrpc_local, rejecter);
+	rxrpc_get_local(local);
+
+	_enter("%d", local->debug_id);
+
+	iov[0].iov_base = &hdr;
+	iov[0].iov_len = sizeof(hdr);
+	iov[1].iov_base = &code;
+	iov[1].iov_len = sizeof(code);
+	size = sizeof(hdr) + sizeof(code);
+
+	msg.msg_name = &sa;
+	msg.msg_control = NULL;
+	msg.msg_controllen = 0;
+	msg.msg_flags = 0;
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sa.sa_family = local->srx.transport.family;
+	switch (sa.sa.sa_family) {
+	case AF_INET:
+		msg.msg_namelen = sizeof(sa.sin);
+		break;
+	default:
+		msg.msg_namelen = 0;
+		break;
+	}
+
+	memset(&hdr, 0, sizeof(hdr));
+	hdr.type = RXRPC_PACKET_TYPE_ABORT;
+
+	while ((skb = skb_dequeue(&local->reject_queue))) {
+		sp = rxrpc_skb(skb);
+		switch (sa.sa.sa_family) {
+		case AF_INET:
+			sa.sin.sin_port = udp_hdr(skb)->source;
+			sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
+			code = htonl(skb->priority);
+
+			hdr.epoch = sp->hdr.epoch;
+			hdr.cid = sp->hdr.cid;
+			hdr.callNumber = sp->hdr.callNumber;
+			hdr.serviceId = sp->hdr.serviceId;
+			hdr.flags = sp->hdr.flags;
+			hdr.flags ^= RXRPC_CLIENT_INITIATED;
+			hdr.flags &= RXRPC_CLIENT_INITIATED;
+
+			kernel_sendmsg(local->socket, &msg, iov, 2, size);
+			break;
+
+		default:
+			break;
+		}
+
+		rxrpc_free_skb(skb);
+		rxrpc_put_local(local);
+	}
+
+	rxrpc_put_local(local);
+	_leave("");
+}
diff --git a/net/rxrpc/ar-error.c b/net/rxrpc/ar-error.c
new file mode 100644
index 0000000..f5539e2
--- /dev/null
+++ b/net/rxrpc/ar-error.c
@@ -0,0 +1,253 @@
+/* Error message handling (ICMP)
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+/*
+ * handle an error received on the local endpoint
+ */
+void rxrpc_UDP_error_report(struct sock *sk)
+{
+	struct sock_exterr_skb *serr;
+	struct rxrpc_transport *trans;
+	struct rxrpc_local *local = sk->sk_user_data;
+	struct rxrpc_peer *peer;
+	struct sk_buff *skb;
+	__be32 addr;
+	__be16 port;
+
+	_enter("%p{%d}", sk, local->debug_id);
+
+	skb = skb_dequeue(&sk->sk_error_queue);
+	if (!skb) {
+		_leave("UDP socket errqueue empty");
+		return;
+	}
+
+	rxrpc_new_skb(skb);
+
+	serr = SKB_EXT_ERR(skb);
+	addr = *(__be32 *)(skb_network_header(skb) + serr->addr_offset);
+	port = serr->port;
+
+	_net("Rx UDP Error from "NIPQUAD_FMT":%hu",
+	     NIPQUAD(addr), ntohs(port));
+	_debug("Msg l:%d d:%d", skb->len, skb->data_len);
+
+	peer = rxrpc_find_peer(local, addr, port);
+	if (IS_ERR(peer)) {
+		rxrpc_free_skb(skb);
+		_leave(" [no peer]");
+		return;
+	}
+
+	trans = rxrpc_find_transport(local, peer);
+	if (!trans) {
+		rxrpc_put_peer(peer);
+		rxrpc_free_skb(skb);
+		_leave(" [no trans]");
+		return;
+	}
+
+	if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
+	    serr->ee.ee_type == ICMP_DEST_UNREACH &&
+	    serr->ee.ee_code == ICMP_FRAG_NEEDED
+	    ) {
+		u32 mtu = serr->ee.ee_info;
+
+		_net("Rx Received ICMP Fragmentation Needed (%d)", mtu);
+
+		/* wind down the local interface MTU */
+		if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
+			peer->if_mtu = mtu;
+			_net("I/F MTU %u", mtu);
+		}
+
+		/* ip_rt_frag_needed() may have eaten the info */
+		if (mtu == 0)
+			mtu = ntohs(icmp_hdr(skb)->un.frag.mtu);
+
+		if (mtu == 0) {
+			/* they didn't give us a size, estimate one */
+			if (mtu > 1500) {
+				mtu >>= 1;
+				if (mtu < 1500)
+					mtu = 1500;
+			} else {
+				mtu -= 100;
+				if (mtu < peer->hdrsize)
+					mtu = peer->hdrsize + 4;
+			}
+		}
+
+		if (mtu < peer->mtu) {
+			peer->mtu = mtu;
+			peer->maxdata = peer->mtu - peer->hdrsize;
+			_net("Net MTU %u (maxdata %u)",
+			     peer->mtu, peer->maxdata);
+		}
+	}
+
+	rxrpc_put_peer(peer);
+
+	/* pass the transport ref to error_handler to release */
+	skb_queue_tail(&trans->error_queue, skb);
+	schedule_work(&trans->error_handler);
+
+	/* reset and regenerate socket error */
+	spin_lock_bh(&sk->sk_error_queue.lock);
+	sk->sk_err = 0;
+	skb = skb_peek(&sk->sk_error_queue);
+	if (skb) {
+		sk->sk_err = SKB_EXT_ERR(skb)->ee.ee_errno;
+		spin_unlock_bh(&sk->sk_error_queue.lock);
+		sk->sk_error_report(sk);
+	} else {
+		spin_unlock_bh(&sk->sk_error_queue.lock);
+	}
+
+	_leave("");
+}
+
+/*
+ * deal with UDP error messages
+ */
+void rxrpc_UDP_error_handler(struct work_struct *work)
+{
+	struct sock_extended_err *ee;
+	struct sock_exterr_skb *serr;
+	struct rxrpc_transport *trans =
+		container_of(work, struct rxrpc_transport, error_handler);
+	struct sk_buff *skb;
+	int local, err;
+
+	_enter("");
+
+	skb = skb_dequeue(&trans->error_queue);
+	if (!skb)
+		return;
+
+	serr = SKB_EXT_ERR(skb);
+	ee = &serr->ee;
+
+	_net("Rx Error o=%d t=%d c=%d e=%d",
+	     ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno);
+
+	err = ee->ee_errno;
+
+	switch (ee->ee_origin) {
+	case SO_EE_ORIGIN_ICMP:
+		local = 0;
+		switch (ee->ee_type) {
+		case ICMP_DEST_UNREACH:
+			switch (ee->ee_code) {
+			case ICMP_NET_UNREACH:
+				_net("Rx Received ICMP Network Unreachable");
+				err = ENETUNREACH;
+				break;
+			case ICMP_HOST_UNREACH:
+				_net("Rx Received ICMP Host Unreachable");
+				err = EHOSTUNREACH;
+				break;
+			case ICMP_PORT_UNREACH:
+				_net("Rx Received ICMP Port Unreachable");
+				err = ECONNREFUSED;
+				break;
+			case ICMP_FRAG_NEEDED:
+				_net("Rx Received ICMP Fragmentation Needed (%d)",
+				     ee->ee_info);
+				err = 0; /* dealt with elsewhere */
+				break;
+			case ICMP_NET_UNKNOWN:
+				_net("Rx Received ICMP Unknown Network");
+				err = ENETUNREACH;
+				break;
+			case ICMP_HOST_UNKNOWN:
+				_net("Rx Received ICMP Unknown Host");
+				err = EHOSTUNREACH;
+				break;
+			default:
+				_net("Rx Received ICMP DestUnreach code=%u",
+				     ee->ee_code);
+				break;
+			}
+			break;
+
+		case ICMP_TIME_EXCEEDED:
+			_net("Rx Received ICMP TTL Exceeded");
+			break;
+
+		default:
+			_proto("Rx Received ICMP error { type=%u code=%u }",
+			       ee->ee_type, ee->ee_code);
+			break;
+		}
+		break;
+
+	case SO_EE_ORIGIN_LOCAL:
+		_proto("Rx Received local error { error=%d }",
+		       ee->ee_errno);
+		local = 1;
+		break;
+
+	case SO_EE_ORIGIN_NONE:
+	case SO_EE_ORIGIN_ICMP6:
+	default:
+		_proto("Rx Received error report { orig=%u }",
+		       ee->ee_origin);
+		local = 0;
+		break;
+	}
+
+	/* terminate all the affected calls if there's an unrecoverable
+	 * error */
+	if (err) {
+		struct rxrpc_call *call, *_n;
+
+		_debug("ISSUE ERROR %d", err);
+
+		spin_lock_bh(&trans->peer->lock);
+		trans->peer->net_error = err;
+
+		list_for_each_entry_safe(call, _n, &trans->peer->error_targets,
+					 error_link) {
+			write_lock(&call->state_lock);
+			if (call->state != RXRPC_CALL_COMPLETE &&
+			    call->state < RXRPC_CALL_NETWORK_ERROR) {
+				call->state = RXRPC_CALL_NETWORK_ERROR;
+				set_bit(RXRPC_CALL_RCVD_ERROR, &call->events);
+				schedule_work(&call->processor);
+			}
+			write_unlock(&call->state_lock);
+			list_del_init(&call->error_link);
+		}
+
+		spin_unlock_bh(&trans->peer->lock);
+	}
+
+	if (!skb_queue_empty(&trans->error_queue))
+		schedule_work(&trans->error_handler);
+
+	rxrpc_free_skb(skb);
+	rxrpc_put_transport(trans);
+	_leave("");
+}
diff --git a/net/rxrpc/ar-input.c b/net/rxrpc/ar-input.c
new file mode 100644
index 0000000..323c345
--- /dev/null
+++ b/net/rxrpc/ar-input.c
@@ -0,0 +1,791 @@
+/* RxRPC packet reception
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+unsigned long rxrpc_ack_timeout = 1;
+
+const char *rxrpc_pkts[] = {
+	"?00",
+	"DATA", "ACK", "BUSY", "ABORT", "ACKALL", "CHALL", "RESP", "DEBUG",
+	"?09", "?10", "?11", "?12", "?13", "?14", "?15"
+};
+
+/*
+ * queue a packet for recvmsg to pass to userspace
+ * - the caller must hold a lock on call->lock
+ * - must not be called with interrupts disabled (sk_filter() disables BH's)
+ * - eats the packet whether successful or not
+ * - there must be just one reference to the packet, which the caller passes to
+ *   this function
+ */
+int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb,
+			bool force, bool terminal)
+{
+	struct rxrpc_skb_priv *sp;
+	struct sock *sk;
+	int skb_len, ret;
+
+	_enter(",,%d,%d", force, terminal);
+
+	ASSERT(!irqs_disabled());
+
+	sp = rxrpc_skb(skb);
+	ASSERTCMP(sp->call, ==, call);
+
+	/* if we've already posted the terminal message for a call, then we
+	 * don't post any more */
+	if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) {
+		_debug("already terminated");
+		ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE);
+		skb->destructor = NULL;
+		sp->call = NULL;
+		rxrpc_put_call(call);
+		rxrpc_free_skb(skb);
+		return 0;
+	}
+
+	sk = &call->socket->sk;
+
+	if (!force) {
+		/* cast skb->rcvbuf to unsigned...  It's pointless, but
+		 * reduces number of warnings when compiling with -W
+		 * --ANK */
+//		ret = -ENOBUFS;
+//		if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
+//		    (unsigned) sk->sk_rcvbuf)
+//			goto out;
+
+		ret = sk_filter(sk, skb);
+		if (ret < 0)
+			goto out;
+	}
+
+	spin_lock_bh(&sk->sk_receive_queue.lock);
+	if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) &&
+	    !test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+	    call->socket->sk.sk_state != RXRPC_CLOSE) {
+		skb->destructor = rxrpc_packet_destructor;
+		skb->dev = NULL;
+		skb->sk = sk;
+		atomic_add(skb->truesize, &sk->sk_rmem_alloc);
+
+		/* Cache the SKB length before we tack it onto the receive
+		 * queue.  Once it is added it no longer belongs to us and
+		 * may be freed by other threads of control pulling packets
+		 * from the queue.
+		 */
+		skb_len = skb->len;
+
+		_net("post skb %p", skb);
+		__skb_queue_tail(&sk->sk_receive_queue, skb);
+		spin_unlock_bh(&sk->sk_receive_queue.lock);
+
+		if (!sock_flag(sk, SOCK_DEAD))
+			sk->sk_data_ready(sk, skb_len);
+
+		if (terminal) {
+			_debug("<<<< TERMINAL MESSAGE >>>>");
+			set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags);
+		}
+
+		skb = NULL;
+	} else {
+		spin_unlock_bh(&sk->sk_receive_queue.lock);
+	}
+	ret = 0;
+
+out:
+	/* release the socket buffer */
+	if (skb) {
+		skb->destructor = NULL;
+		sp->call = NULL;
+		rxrpc_put_call(call);
+		rxrpc_free_skb(skb);
+	}
+
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * process a DATA packet, posting the packet to the appropriate queue
+ * - eats the packet if successful
+ */
+static int rxrpc_fast_process_data(struct rxrpc_call *call,
+				   struct sk_buff *skb, u32 seq)
+{
+	struct rxrpc_skb_priv *sp;
+	bool terminal;
+	int ret, ackbit, ack;
+
+	_enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq);
+
+	sp = rxrpc_skb(skb);
+	ASSERTCMP(sp->call, ==, NULL);
+
+	spin_lock(&call->lock);
+
+	if (call->state > RXRPC_CALL_COMPLETE)
+		goto discard;
+
+	ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post);
+	ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv);
+	ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten);
+
+	if (seq < call->rx_data_post) {
+		_debug("dup #%u [-%u]", seq, call->rx_data_post);
+		ack = RXRPC_ACK_DUPLICATE;
+		ret = -ENOBUFS;
+		goto discard_and_ack;
+	}
+
+	/* we may already have the packet in the out of sequence queue */
+	ackbit = seq - (call->rx_data_eaten + 1);
+	ASSERTCMP(ackbit, >=, 0);
+	if (__test_and_set_bit(ackbit, &call->ackr_window)) {
+		_debug("dup oos #%u [%u,%u]",
+		       seq, call->rx_data_eaten, call->rx_data_post);
+		ack = RXRPC_ACK_DUPLICATE;
+		goto discard_and_ack;
+	}
+
+	if (seq >= call->ackr_win_top) {
+		_debug("exceed #%u [%u]", seq, call->ackr_win_top);
+		__clear_bit(ackbit, &call->ackr_window);
+		ack = RXRPC_ACK_EXCEEDS_WINDOW;
+		goto discard_and_ack;
+	}
+
+	if (seq == call->rx_data_expect) {
+		clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags);
+		call->rx_data_expect++;
+	} else if (seq > call->rx_data_expect) {
+		_debug("oos #%u [%u]", seq, call->rx_data_expect);
+		call->rx_data_expect = seq + 1;
+		if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) {
+			ack = RXRPC_ACK_OUT_OF_SEQUENCE;
+			goto enqueue_and_ack;
+		}
+		goto enqueue_packet;
+	}
+
+	if (seq != call->rx_data_post) {
+		_debug("ahead #%u [%u]", seq, call->rx_data_post);
+		goto enqueue_packet;
+	}
+
+	if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags))
+		goto protocol_error;
+
+	/* if the packet need security things doing to it, then it goes down
+	 * the slow path */
+	if (call->conn->security)
+		goto enqueue_packet;
+
+	sp->call = call;
+	rxrpc_get_call(call);
+	terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) &&
+		    !(sp->hdr.flags & RXRPC_CLIENT_INITIATED));
+	ret = rxrpc_queue_rcv_skb(call, skb, false, terminal);
+	if (ret < 0) {
+		if (ret == -ENOMEM || ret == -ENOBUFS) {
+			__clear_bit(ackbit, &call->ackr_window);
+			ack = RXRPC_ACK_NOSPACE;
+			goto discard_and_ack;
+		}
+		goto out;
+	}
+
+	skb = NULL;
+
+	_debug("post #%u", seq);
+	ASSERTCMP(call->rx_data_post, ==, seq);
+	call->rx_data_post++;
+
+	if (sp->hdr.flags & RXRPC_LAST_PACKET)
+		set_bit(RXRPC_CALL_RCVD_LAST, &call->flags);
+
+	/* if we've reached an out of sequence packet then we need to drain
+	 * that queue into the socket Rx queue now */
+	if (call->rx_data_post == call->rx_first_oos) {
+		_debug("drain rx oos now");
+		read_lock(&call->state_lock);
+		if (call->state < RXRPC_CALL_COMPLETE &&
+		    !test_and_set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events))
+			schedule_work(&call->processor);
+		read_unlock(&call->state_lock);
+	}
+
+	spin_unlock(&call->lock);
+	atomic_inc(&call->ackr_not_idle);
+	rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false);
+	_leave(" = 0 [posted]");
+	return 0;
+
+protocol_error:
+	ret = -EBADMSG;
+out:
+	spin_unlock(&call->lock);
+	_leave(" = %d", ret);
+	return ret;
+
+discard_and_ack:
+	_debug("discard and ACK packet %p", skb);
+	__rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
+discard:
+	spin_unlock(&call->lock);
+	rxrpc_free_skb(skb);
+	_leave(" = 0 [discarded]");
+	return 0;
+
+enqueue_and_ack:
+	__rxrpc_propose_ACK(call, ack, sp->hdr.serial, true);
+enqueue_packet:
+	_net("defer skb %p", skb);
+	spin_unlock(&call->lock);
+	skb_queue_tail(&call->rx_queue, skb);
+	atomic_inc(&call->ackr_not_idle);
+	read_lock(&call->state_lock);
+	if (call->state < RXRPC_CALL_DEAD)
+		schedule_work(&call->processor);
+	read_unlock(&call->state_lock);
+	_leave(" = 0 [queued]");
+	return 0;
+}
+
+/*
+ * assume an implicit ACKALL of the transmission phase of a client socket upon
+ * reception of the first reply packet
+ */
+static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial)
+{
+	write_lock_bh(&call->state_lock);
+
+	switch (call->state) {
+	case RXRPC_CALL_CLIENT_AWAIT_REPLY:
+		call->state = RXRPC_CALL_CLIENT_RECV_REPLY;
+		call->acks_latest = serial;
+
+		_debug("implicit ACKALL %%%u", call->acks_latest);
+		set_bit(RXRPC_CALL_RCVD_ACKALL, &call->events);
+		write_unlock_bh(&call->state_lock);
+
+		if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
+			clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
+			clear_bit(RXRPC_CALL_RESEND, &call->events);
+			clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+		}
+		break;
+
+	default:
+		write_unlock_bh(&call->state_lock);
+		break;
+	}
+}
+
+/*
+ * post an incoming packet to the nominated call to deal with
+ * - must get rid of the sk_buff, either by freeing it or by queuing it
+ */
+void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb)
+{
+	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+	__be32 _abort_code;
+	u32 serial, hi_serial, seq, abort_code;
+
+	_enter("%p,%p", call, skb);
+
+	ASSERT(!irqs_disabled());
+
+#if 0 // INJECT RX ERROR
+	if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
+		static int skip = 0;
+		if (++skip == 3) {
+			printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n");
+			skip = 0;
+			goto free_packet;
+		}
+	}
+#endif
+
+	/* track the latest serial number on this connection for ACK packet
+	 * information */
+	serial = ntohl(sp->hdr.serial);
+	hi_serial = atomic_read(&call->conn->hi_serial);
+	while (serial > hi_serial)
+		hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial,
+					   serial);
+
+	/* request ACK generation for any ACK or DATA packet that requests
+	 * it */
+	if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
+		_proto("ACK Requested on %%%u", serial);
+		rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial,
+				  !(sp->hdr.flags & RXRPC_MORE_PACKETS));
+	}
+
+	switch (sp->hdr.type) {
+	case RXRPC_PACKET_TYPE_ABORT:
+		_debug("abort");
+
+		if (skb_copy_bits(skb, 0, &_abort_code,
+				  sizeof(_abort_code)) < 0)
+			goto protocol_error;
+
+		abort_code = ntohl(_abort_code);
+		_proto("Rx ABORT %%%u { %x }", serial, abort_code);
+
+		write_lock_bh(&call->state_lock);
+		if (call->state < RXRPC_CALL_COMPLETE) {
+			call->state = RXRPC_CALL_REMOTELY_ABORTED;
+			call->abort_code = abort_code;
+			set_bit(RXRPC_CALL_RCVD_ABORT, &call->events);
+			schedule_work(&call->processor);
+		}
+		goto free_packet_unlock;
+
+	case RXRPC_PACKET_TYPE_BUSY:
+		_proto("Rx BUSY %%%u", serial);
+
+		if (call->conn->out_clientflag)
+			goto protocol_error;
+
+		write_lock_bh(&call->state_lock);
+		switch (call->state) {
+		case RXRPC_CALL_CLIENT_SEND_REQUEST:
+			call->state = RXRPC_CALL_SERVER_BUSY;
+			set_bit(RXRPC_CALL_RCVD_BUSY, &call->events);
+			schedule_work(&call->processor);
+		case RXRPC_CALL_SERVER_BUSY:
+			goto free_packet_unlock;
+		default:
+			goto protocol_error_locked;
+		}
+
+	default:
+		_proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], serial);
+		goto protocol_error;
+
+	case RXRPC_PACKET_TYPE_DATA:
+		seq = ntohl(sp->hdr.seq);
+
+		_proto("Rx DATA %%%u { #%u }", serial, seq);
+
+		if (seq == 0)
+			goto protocol_error;
+
+		call->ackr_prev_seq = sp->hdr.seq;
+
+		/* received data implicitly ACKs all of the request packets we
+		 * sent when we're acting as a client */
+		if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
+			rxrpc_assume_implicit_ackall(call, serial);
+
+		switch (rxrpc_fast_process_data(call, skb, seq)) {
+		case 0:
+			skb = NULL;
+			goto done;
+
+		default:
+			BUG();
+
+			/* data packet received beyond the last packet */
+		case -EBADMSG:
+			goto protocol_error;
+		}
+
+	case RXRPC_PACKET_TYPE_ACK:
+		/* ACK processing is done in process context */
+		read_lock_bh(&call->state_lock);
+		if (call->state < RXRPC_CALL_DEAD) {
+			skb_queue_tail(&call->rx_queue, skb);
+			schedule_work(&call->processor);
+			skb = NULL;
+		}
+		read_unlock_bh(&call->state_lock);
+		goto free_packet;
+	}
+
+protocol_error:
+	_debug("protocol error");
+	write_lock_bh(&call->state_lock);
+protocol_error_locked:
+	if (call->state <= RXRPC_CALL_COMPLETE) {
+		call->state = RXRPC_CALL_LOCALLY_ABORTED;
+		call->abort_code = RX_PROTOCOL_ERROR;
+		set_bit(RXRPC_CALL_ABORT, &call->events);
+		schedule_work(&call->processor);
+	}
+free_packet_unlock:
+	write_unlock_bh(&call->state_lock);
+free_packet:
+	rxrpc_free_skb(skb);
+done:
+	_leave("");
+}
+
+/*
+ * split up a jumbo data packet
+ */
+static void rxrpc_process_jumbo_packet(struct rxrpc_call *call,
+				       struct sk_buff *jumbo)
+{
+	struct rxrpc_jumbo_header jhdr;
+	struct rxrpc_skb_priv *sp;
+	struct sk_buff *part;
+
+	_enter(",{%u,%u}", jumbo->data_len, jumbo->len);
+
+	sp = rxrpc_skb(jumbo);
+
+	do {
+		sp->hdr.flags &= ~RXRPC_JUMBO_PACKET;
+
+		/* make a clone to represent the first subpacket in what's left
+		 * of the jumbo packet */
+		part = skb_clone(jumbo, GFP_ATOMIC);
+		if (!part) {
+			/* simply ditch the tail in the event of ENOMEM */
+			pskb_trim(jumbo, RXRPC_JUMBO_DATALEN);
+			break;
+		}
+		rxrpc_new_skb(part);
+
+		pskb_trim(part, RXRPC_JUMBO_DATALEN);
+
+		if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN))
+			goto protocol_error;
+
+		if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0)
+			goto protocol_error;
+		if (!pskb_pull(jumbo, sizeof(jhdr)))
+			BUG();
+
+		sp->hdr.seq	= htonl(ntohl(sp->hdr.seq) + 1);
+		sp->hdr.serial	= htonl(ntohl(sp->hdr.serial) + 1);
+		sp->hdr.flags	= jhdr.flags;
+		sp->hdr._rsvd	= jhdr._rsvd;
+
+		_proto("Rx DATA Jumbo %%%u", ntohl(sp->hdr.serial) - 1);
+
+		rxrpc_fast_process_packet(call, part);
+		part = NULL;
+
+	} while (sp->hdr.flags & RXRPC_JUMBO_PACKET);
+
+	rxrpc_fast_process_packet(call, jumbo);
+	_leave("");
+	return;
+
+protocol_error:
+	_debug("protocol error");
+	rxrpc_free_skb(part);
+	rxrpc_free_skb(jumbo);
+	write_lock_bh(&call->state_lock);
+	if (call->state <= RXRPC_CALL_COMPLETE) {
+		call->state = RXRPC_CALL_LOCALLY_ABORTED;
+		call->abort_code = RX_PROTOCOL_ERROR;
+		set_bit(RXRPC_CALL_ABORT, &call->events);
+		schedule_work(&call->processor);
+	}
+	write_unlock_bh(&call->state_lock);
+	_leave("");
+}
+
+/*
+ * post an incoming packet to the appropriate call/socket to deal with
+ * - must get rid of the sk_buff, either by freeing it or by queuing it
+ */
+static void rxrpc_post_packet_to_call(struct rxrpc_connection *conn,
+				      struct sk_buff *skb)
+{
+	struct rxrpc_skb_priv *sp;
+	struct rxrpc_call *call;
+	struct rb_node *p;
+	__be32 call_id;
+
+	_enter("%p,%p", conn, skb);
+
+	read_lock_bh(&conn->lock);
+
+	sp = rxrpc_skb(skb);
+
+	/* look at extant calls by channel number first */
+	call = conn->channels[ntohl(sp->hdr.cid) & RXRPC_CHANNELMASK];
+	if (!call || call->call_id != sp->hdr.callNumber)
+		goto call_not_extant;
+
+	_debug("extant call [%d]", call->state);
+	ASSERTCMP(call->conn, ==, conn);
+
+	read_lock(&call->state_lock);
+	switch (call->state) {
+	case RXRPC_CALL_LOCALLY_ABORTED:
+		if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
+			schedule_work(&call->processor);
+	case RXRPC_CALL_REMOTELY_ABORTED:
+	case RXRPC_CALL_NETWORK_ERROR:
+	case RXRPC_CALL_DEAD:
+		goto free_unlock;
+	default:
+		break;
+	}
+
+	read_unlock(&call->state_lock);
+	rxrpc_get_call(call);
+	read_unlock_bh(&conn->lock);
+
+	if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
+	    sp->hdr.flags & RXRPC_JUMBO_PACKET)
+		rxrpc_process_jumbo_packet(call, skb);
+	else
+		rxrpc_fast_process_packet(call, skb);
+
+	rxrpc_put_call(call);
+	goto done;
+
+call_not_extant:
+	/* search the completed calls in case what we're dealing with is
+	 * there */
+	_debug("call not extant");
+
+	call_id = sp->hdr.callNumber;
+	p = conn->calls.rb_node;
+	while (p) {
+		call = rb_entry(p, struct rxrpc_call, conn_node);
+
+		if (call_id < call->call_id)
+			p = p->rb_left;
+		else if (call_id > call->call_id)
+			p = p->rb_right;
+		else
+			goto found_completed_call;
+	}
+
+dead_call:
+	/* it's a either a really old call that we no longer remember or its a
+	 * new incoming call */
+	read_unlock_bh(&conn->lock);
+
+	if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
+	    sp->hdr.seq == __constant_cpu_to_be32(1)) {
+		_debug("incoming call");
+		skb_queue_tail(&conn->trans->local->accept_queue, skb);
+		schedule_work(&conn->trans->local->acceptor);
+		goto done;
+	}
+
+	_debug("dead call");
+	skb->priority = RX_CALL_DEAD;
+	rxrpc_reject_packet(conn->trans->local, skb);
+	goto done;
+
+	/* resend last packet of a completed call
+	 * - client calls may have been aborted or ACK'd
+	 * - server calls may have been aborted
+	 */
+found_completed_call:
+	_debug("completed call");
+
+	if (atomic_read(&call->usage) == 0)
+		goto dead_call;
+
+	/* synchronise any state changes */
+	read_lock(&call->state_lock);
+	ASSERTIFCMP(call->state != RXRPC_CALL_CLIENT_FINAL_ACK,
+		    call->state, >=, RXRPC_CALL_COMPLETE);
+
+	if (call->state == RXRPC_CALL_LOCALLY_ABORTED ||
+	    call->state == RXRPC_CALL_REMOTELY_ABORTED ||
+	    call->state == RXRPC_CALL_DEAD) {
+		read_unlock(&call->state_lock);
+		goto dead_call;
+	}
+
+	if (call->conn->in_clientflag) {
+		read_unlock(&call->state_lock);
+		goto dead_call; /* complete server call */
+	}
+
+	_debug("final ack again");
+	rxrpc_get_call(call);
+	set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
+	schedule_work(&call->processor);
+
+free_unlock:
+	read_unlock(&call->state_lock);
+	read_unlock_bh(&conn->lock);
+	rxrpc_free_skb(skb);
+done:
+	_leave("");
+}
+
+/*
+ * post connection-level events to the connection
+ * - this includes challenges, responses and some aborts
+ */
+static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
+				      struct sk_buff *skb)
+{
+	_enter("%p,%p", conn, skb);
+
+	atomic_inc(&conn->usage);
+	skb_queue_tail(&conn->rx_queue, skb);
+	schedule_work(&conn->processor);
+}
+
+/*
+ * handle data received on the local endpoint
+ * - may be called in interrupt context
+ */
+void rxrpc_data_ready(struct sock *sk, int count)
+{
+	struct rxrpc_connection *conn;
+	struct rxrpc_transport *trans;
+	struct rxrpc_skb_priv *sp;
+	struct rxrpc_local *local;
+	struct rxrpc_peer *peer;
+	struct sk_buff *skb;
+	int ret;
+
+	_enter("%p, %d", sk, count);
+
+	ASSERT(!irqs_disabled());
+
+	read_lock_bh(&rxrpc_local_lock);
+	local = sk->sk_user_data;
+	if (local && atomic_read(&local->usage) > 0)
+		rxrpc_get_local(local);
+	else
+		local = NULL;
+	read_unlock_bh(&rxrpc_local_lock);
+	if (!local) {
+		_leave(" [local dead]");
+		return;
+	}
+
+	skb = skb_recv_datagram(sk, 0, 1, &ret);
+	if (!skb) {
+		rxrpc_put_local(local);
+		if (ret == -EAGAIN)
+			return;
+		_debug("UDP socket error %d", ret);
+		return;
+	}
+
+	rxrpc_new_skb(skb);
+
+	_net("recv skb %p", skb);
+
+	/* we'll probably need to checksum it (didn't call sock_recvmsg) */
+	if (skb_checksum_complete(skb)) {
+		rxrpc_free_skb(skb);
+		rxrpc_put_local(local);
+		_leave(" [CSUM failed]");
+		return;
+	}
+
+	/* the socket buffer we have is owned by UDP, with UDP's data all over
+	 * it, but we really want our own */
+	skb_orphan(skb);
+	sp = rxrpc_skb(skb);
+	memset(sp, 0, sizeof(*sp));
+
+	_net("Rx UDP packet from %08x:%04hu",
+	     ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
+
+	/* dig out the RxRPC connection details */
+	if (skb_copy_bits(skb, sizeof(struct udphdr), &sp->hdr,
+			  sizeof(sp->hdr)) < 0)
+		goto bad_message;
+	if (!pskb_pull(skb, sizeof(struct udphdr) + sizeof(sp->hdr)))
+		BUG();
+
+	_net("Rx RxRPC %s ep=%x call=%x:%x",
+	     sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient",
+	     ntohl(sp->hdr.epoch),
+	     ntohl(sp->hdr.cid),
+	     ntohl(sp->hdr.callNumber));
+
+	if (sp->hdr.type == 0 || sp->hdr.type >= RXRPC_N_PACKET_TYPES) {
+		_proto("Rx Bad Packet Type %u", sp->hdr.type);
+		goto bad_message;
+	}
+
+	if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
+	    (sp->hdr.callNumber == 0 || sp->hdr.seq == 0))
+		goto bad_message;
+
+	peer = rxrpc_find_peer(local, ip_hdr(skb)->saddr, udp_hdr(skb)->source);
+	if (IS_ERR(peer))
+		goto cant_route_call;
+
+	trans = rxrpc_find_transport(local, peer);
+	rxrpc_put_peer(peer);
+	if (!trans)
+		goto cant_route_call;
+
+	conn = rxrpc_find_connection(trans, &sp->hdr);
+	rxrpc_put_transport(trans);
+	if (!conn)
+		goto cant_route_call;
+
+	_debug("CONN %p {%d}", conn, conn->debug_id);
+
+	if (sp->hdr.callNumber == 0)
+		rxrpc_post_packet_to_conn(conn, skb);
+	else
+		rxrpc_post_packet_to_call(conn, skb);
+	rxrpc_put_connection(conn);
+	rxrpc_put_local(local);
+	return;
+
+cant_route_call:
+	_debug("can't route call");
+	if (sp->hdr.flags & RXRPC_CLIENT_INITIATED &&
+	    sp->hdr.type == RXRPC_PACKET_TYPE_DATA) {
+		if (sp->hdr.seq == __constant_cpu_to_be32(1)) {
+			_debug("first packet");
+			skb_queue_tail(&local->accept_queue, skb);
+			schedule_work(&local->acceptor);
+			rxrpc_put_local(local);
+			_leave(" [incoming]");
+			return;
+		}
+		skb->priority = RX_INVALID_OPERATION;
+	} else {
+		skb->priority = RX_CALL_DEAD;
+	}
+
+	_debug("reject");
+	rxrpc_reject_packet(local, skb);
+	rxrpc_put_local(local);
+	_leave(" [no call]");
+	return;
+
+bad_message:
+	skb->priority = RX_PROTOCOL_ERROR;
+	rxrpc_reject_packet(local, skb);
+	rxrpc_put_local(local);
+	_leave(" [badmsg]");
+}
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
new file mode 100644
index 0000000..7bfbf47
--- /dev/null
+++ b/net/rxrpc/ar-internal.h
@@ -0,0 +1,842 @@
+/* AF_RXRPC internal definitions
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <rxrpc/packet.h>
+
+#if 0
+#define CHECK_SLAB_OKAY(X)				     \
+	BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
+	       (POISON_FREE << 8 | POISON_FREE))
+#else
+#define CHECK_SLAB_OKAY(X) do {} while(0)
+#endif
+
+extern atomic_t rxrpc_n_skbs;
+
+#define FCRYPT_BSIZE 8
+struct rxrpc_crypt {
+	union {
+		u8	x[FCRYPT_BSIZE];
+		u32	n[2];
+	};
+} __attribute__((aligned(8)));
+
+extern __be32 rxrpc_epoch;		/* local epoch for detecting local-end reset */
+extern atomic_t rxrpc_debug_id;		/* current debugging ID */
+
+/*
+ * sk_state for RxRPC sockets
+ */
+enum {
+	RXRPC_UNCONNECTED = 0,
+	RXRPC_CLIENT_BOUND,		/* client local address bound */
+	RXRPC_CLIENT_CONNECTED,		/* client is connected */
+	RXRPC_SERVER_BOUND,		/* server local address bound */
+	RXRPC_SERVER_LISTENING,		/* server listening for connections */
+	RXRPC_CLOSE,			/* socket is being closed */
+};
+
+/*
+ * RxRPC socket definition
+ */
+struct rxrpc_sock {
+	/* WARNING: sk has to be the first member */
+	struct sock		sk;
+	struct rxrpc_local	*local;		/* local endpoint */
+	struct rxrpc_transport	*trans;		/* transport handler */
+	struct rxrpc_conn_bundle *bundle;	/* virtual connection bundle */
+	struct rxrpc_connection	*conn;		/* exclusive virtual connection */
+	struct list_head	listen_link;	/* link in the local endpoint's listen list */
+	struct list_head	secureq;	/* calls awaiting connection security clearance */
+	struct list_head	acceptq;	/* calls awaiting acceptance */
+	struct key		*key;		/* security for this socket */
+	struct key		*securities;	/* list of server security descriptors */
+	struct rb_root		calls;		/* outstanding calls on this socket */
+	unsigned long		flags;
+#define RXRPC_SOCK_EXCLUSIVE_CONN	1	/* exclusive connection for a client socket */
+	rwlock_t		call_lock;	/* lock for calls */
+	u32			min_sec_level;	/* minimum security level */
+#define RXRPC_SECURITY_MAX	RXRPC_SECURITY_ENCRYPT
+	struct sockaddr_rxrpc	srx;		/* local address */
+	sa_family_t		proto;		/* protocol created with */
+	__be16			service_id;	/* service ID of local/remote service */
+};
+
+#define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
+
+/*
+ * RxRPC socket buffer private variables
+ * - max 48 bytes (struct sk_buff::cb)
+ */
+struct rxrpc_skb_priv {
+	struct rxrpc_call	*call;		/* call with which associated */
+	unsigned long		resend_at;	/* time in jiffies at which to resend */
+	union {
+		unsigned	offset;		/* offset into buffer of next read */
+		int		remain;		/* amount of space remaining for next write */
+		u32		error;		/* network error code */
+		bool		need_resend;	/* T if needs resending */
+	};
+
+	struct rxrpc_header	hdr;		/* RxRPC packet header from this packet */
+};
+
+#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
+
+enum {
+	RXRPC_SKB_MARK_DATA,		/* data message */
+	RXRPC_SKB_MARK_FINAL_ACK,	/* final ACK received message */
+	RXRPC_SKB_MARK_BUSY,		/* server busy message */
+	RXRPC_SKB_MARK_REMOTE_ABORT,	/* remote abort message */
+	RXRPC_SKB_MARK_NET_ERROR,	/* network error message */
+	RXRPC_SKB_MARK_LOCAL_ERROR,	/* local error message */
+	RXRPC_SKB_MARK_NEW_CALL,	/* local error message */
+};
+
+enum rxrpc_command {
+	RXRPC_CMD_SEND_DATA,		/* send data message */
+	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
+	RXRPC_CMD_ACCEPT,		/* [server] accept incoming call */
+	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
+};
+
+/*
+ * RxRPC security module interface
+ */
+struct rxrpc_security {
+	struct module		*owner;		/* providing module */
+	struct list_head	link;		/* link in master list */
+	const char		*name;		/* name of this service */
+	u8			security_index;	/* security type provided */
+
+	/* initialise a connection's security */
+	int (*init_connection_security)(struct rxrpc_connection *);
+
+	/* prime a connection's packet security */
+	void (*prime_packet_security)(struct rxrpc_connection *);
+
+	/* impose security on a packet */
+	int (*secure_packet)(const struct rxrpc_call *,
+			     struct sk_buff *,
+			     size_t,
+			     void *);
+
+	/* verify the security on a received packet */
+	int (*verify_packet)(const struct rxrpc_call *, struct sk_buff *,
+			     u32 *);
+
+	/* issue a challenge */
+	int (*issue_challenge)(struct rxrpc_connection *);
+
+	/* respond to a challenge */
+	int (*respond_to_challenge)(struct rxrpc_connection *,
+				    struct sk_buff *,
+				    u32 *);
+
+	/* verify a response */
+	int (*verify_response)(struct rxrpc_connection *,
+			       struct sk_buff *,
+			       u32 *);
+
+	/* clear connection security */
+	void (*clear)(struct rxrpc_connection *);
+};
+
+/*
+ * RxRPC local transport endpoint definition
+ * - matched by local port, address and protocol type
+ */
+struct rxrpc_local {
+	struct socket		*socket;	/* my UDP socket */
+	struct work_struct	destroyer;	/* endpoint destroyer */
+	struct work_struct	acceptor;	/* incoming call processor */
+	struct work_struct	rejecter;	/* packet reject writer */
+	struct list_head	services;	/* services listening on this endpoint */
+	struct list_head	link;		/* link in endpoint list */
+	struct rw_semaphore	defrag_sem;	/* control re-enablement of IP DF bit */
+	struct sk_buff_head	accept_queue;	/* incoming calls awaiting acceptance */
+	struct sk_buff_head	reject_queue;	/* packets awaiting rejection */
+	spinlock_t		lock;		/* access lock */
+	rwlock_t		services_lock;	/* lock for services list */
+	atomic_t		usage;
+	int			debug_id;	/* debug ID for printks */
+	volatile char		error_rcvd;	/* T if received ICMP error outstanding */
+	struct sockaddr_rxrpc	srx;		/* local address */
+};
+
+/*
+ * RxRPC remote transport endpoint definition
+ * - matched by remote port, address and protocol type
+ * - holds the connection ID counter for connections between the two endpoints
+ */
+struct rxrpc_peer {
+	struct work_struct	destroyer;	/* peer destroyer */
+	struct list_head	link;		/* link in master peer list */
+	struct list_head	error_targets;	/* targets for net error distribution */
+	spinlock_t		lock;		/* access lock */
+	atomic_t		usage;
+	unsigned		if_mtu;		/* interface MTU for this peer */
+	unsigned		mtu;		/* network MTU for this peer */
+	unsigned		maxdata;	/* data size (MTU - hdrsize) */
+	unsigned short		hdrsize;	/* header size (IP + UDP + RxRPC) */
+	int			debug_id;	/* debug ID for printks */
+	int			net_error;	/* network error distributed */
+	struct sockaddr_rxrpc	srx;		/* remote address */
+
+	/* calculated RTT cache */
+#define RXRPC_RTT_CACHE_SIZE 32
+	suseconds_t		rtt;		/* current RTT estimate (in uS) */
+	unsigned		rtt_point;	/* next entry at which to insert */
+	unsigned		rtt_usage;	/* amount of cache actually used */
+	suseconds_t		rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
+};
+
+/*
+ * RxRPC point-to-point transport / connection manager definition
+ * - handles a bundle of connections between two endpoints
+ * - matched by { local, peer }
+ */
+struct rxrpc_transport {
+	struct rxrpc_local	*local;		/* local transport endpoint */
+	struct rxrpc_peer	*peer;		/* remote transport endpoint */
+	struct work_struct	error_handler;	/* network error distributor */
+	struct rb_root		bundles;	/* client connection bundles on this transport */
+	struct rb_root		client_conns;	/* client connections on this transport */
+	struct rb_root		server_conns;	/* server connections on this transport */
+	struct list_head	link;		/* link in master session list */
+	struct sk_buff_head	error_queue;	/* error packets awaiting processing */
+	time_t			put_time;	/* time at which to reap */
+	spinlock_t		client_lock;	/* client connection allocation lock */
+	rwlock_t		conn_lock;	/* lock for active/dead connections */
+	atomic_t		usage;
+	int			debug_id;	/* debug ID for printks */
+	unsigned int		conn_idcounter;	/* connection ID counter (client) */
+};
+
+/*
+ * RxRPC client connection bundle
+ * - matched by { transport, service_id, key }
+ */
+struct rxrpc_conn_bundle {
+	struct rb_node		node;		/* node in transport's lookup tree */
+	struct list_head	unused_conns;	/* unused connections in this bundle */
+	struct list_head	avail_conns;	/* available connections in this bundle */
+	struct list_head	busy_conns;	/* busy connections in this bundle */
+	struct key		*key;		/* security for this bundle */
+	wait_queue_head_t	chanwait;	/* wait for channel to become available */
+	atomic_t		usage;
+	int			debug_id;	/* debug ID for printks */
+	unsigned short		num_conns;	/* number of connections in this bundle */
+	__be16			service_id;	/* service ID */
+	uint8_t			security_ix;	/* security type */
+};
+
+/*
+ * RxRPC connection definition
+ * - matched by { transport, service_id, conn_id, direction, key }
+ * - each connection can only handle four simultaneous calls
+ */
+struct rxrpc_connection {
+	struct rxrpc_transport	*trans;		/* transport session */
+	struct rxrpc_conn_bundle *bundle;	/* connection bundle (client) */
+	struct work_struct	processor;	/* connection event processor */
+	struct rb_node		node;		/* node in transport's lookup tree */
+	struct list_head	link;		/* link in master connection list */
+	struct list_head	bundle_link;	/* link in bundle */
+	struct rb_root		calls;		/* calls on this connection */
+	struct sk_buff_head	rx_queue;	/* received conn-level packets */
+	struct rxrpc_call	*channels[RXRPC_MAXCALLS]; /* channels (active calls) */
+	struct rxrpc_security	*security;	/* applied security module */
+	struct key		*key;		/* security for this connection (client) */
+	struct key		*server_key;	/* security for this service */
+	struct crypto_blkcipher	*cipher;	/* encryption handle */
+	struct rxrpc_crypt	csum_iv;	/* packet checksum base */
+	unsigned long		events;
+#define RXRPC_CONN_CHALLENGE	0		/* send challenge packet */
+	time_t			put_time;	/* time at which to reap */
+	rwlock_t		lock;		/* access lock */
+	spinlock_t		state_lock;	/* state-change lock */
+	atomic_t		usage;
+	u32			real_conn_id;	/* connection ID (host-endian) */
+	enum {					/* current state of connection */
+		RXRPC_CONN_UNUSED,		/* - connection not yet attempted */
+		RXRPC_CONN_CLIENT,		/* - client connection */
+		RXRPC_CONN_SERVER_UNSECURED,	/* - server unsecured connection */
+		RXRPC_CONN_SERVER_CHALLENGING,	/* - server challenging for security */
+		RXRPC_CONN_SERVER,		/* - server secured connection */
+		RXRPC_CONN_REMOTELY_ABORTED,	/* - conn aborted by peer */
+		RXRPC_CONN_LOCALLY_ABORTED,	/* - conn aborted locally */
+		RXRPC_CONN_NETWORK_ERROR,	/* - conn terminated by network error */
+	} state;
+	int			error;		/* error code for local abort */
+	int			debug_id;	/* debug ID for printks */
+	unsigned		call_counter;	/* call ID counter */
+	atomic_t		serial;		/* packet serial number counter */
+	atomic_t		hi_serial;	/* highest serial number received */
+	u8			avail_calls;	/* number of calls available */
+	u8			size_align;	/* data size alignment (for security) */
+	u8			header_size;	/* rxrpc + security header size */
+	u8			security_size;	/* security header size */
+	u32			security_level;	/* security level negotiated */
+	u32			security_nonce;	/* response re-use preventer */
+
+	/* the following are all in net order */
+	__be32			epoch;		/* epoch of this connection */
+	__be32			cid;		/* connection ID */
+	__be16			service_id;	/* service ID */
+	u8			security_ix;	/* security type */
+	u8			in_clientflag;	/* RXRPC_CLIENT_INITIATED if we are server */
+	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
+};
+
+/*
+ * RxRPC call definition
+ * - matched by { connection, call_id }
+ */
+struct rxrpc_call {
+	struct rxrpc_connection	*conn;		/* connection carrying call */
+	struct rxrpc_sock	*socket;	/* socket responsible */
+	struct timer_list	lifetimer;	/* lifetime remaining on call */
+	struct timer_list	deadspan;	/* reap timer for re-ACK'ing, etc  */
+	struct timer_list	ack_timer;	/* ACK generation timer */
+	struct timer_list	resend_timer;	/* Tx resend timer */
+	struct work_struct	destroyer;	/* call destroyer */
+	struct work_struct	processor;	/* packet processor and ACK generator */
+	struct list_head	link;		/* link in master call list */
+	struct list_head	error_link;	/* link in error distribution list */
+	struct list_head	accept_link;	/* calls awaiting acceptance */
+	struct rb_node		sock_node;	/* node in socket call tree */
+	struct rb_node		conn_node;	/* node in connection call tree */
+	struct sk_buff_head	rx_queue;	/* received packets */
+	struct sk_buff_head	rx_oos_queue;	/* packets received out of sequence */
+	struct sk_buff		*tx_pending;	/* Tx socket buffer being filled */
+	wait_queue_head_t	tx_waitq;	/* wait for Tx window space to become available */
+	unsigned long		user_call_ID;	/* user-defined call ID */
+	unsigned long		creation_jif;	/* time of call creation */
+	unsigned long		flags;
+#define RXRPC_CALL_RELEASED	0	/* call has been released - no more message to userspace */
+#define RXRPC_CALL_TERMINAL_MSG	1	/* call has given the socket its final message */
+#define RXRPC_CALL_RCVD_LAST	2	/* all packets received */
+#define RXRPC_CALL_RUN_RTIMER	3	/* Tx resend timer started */
+#define RXRPC_CALL_TX_SOFT_ACK	4	/* sent some soft ACKs */
+#define RXRPC_CALL_PROC_BUSY	5	/* the processor is busy */
+#define RXRPC_CALL_INIT_ACCEPT	6	/* acceptance was initiated */
+#define RXRPC_CALL_HAS_USERID	7	/* has a user ID attached */
+#define RXRPC_CALL_EXPECT_OOS	8	/* expect out of sequence packets */
+	unsigned long		events;
+#define RXRPC_CALL_RCVD_ACKALL	0	/* ACKALL or reply received */
+#define RXRPC_CALL_RCVD_BUSY	1	/* busy packet received */
+#define RXRPC_CALL_RCVD_ABORT	2	/* abort packet received */
+#define RXRPC_CALL_RCVD_ERROR	3	/* network error received */
+#define RXRPC_CALL_ACK_FINAL	4	/* need to generate final ACK (and release call) */
+#define RXRPC_CALL_ACK		5	/* need to generate ACK */
+#define RXRPC_CALL_REJECT_BUSY	6	/* need to generate busy message */
+#define RXRPC_CALL_ABORT	7	/* need to generate abort */
+#define RXRPC_CALL_CONN_ABORT	8	/* local connection abort generated */
+#define RXRPC_CALL_RESEND_TIMER	9	/* Tx resend timer expired */
+#define RXRPC_CALL_RESEND	10	/* Tx resend required */
+#define RXRPC_CALL_DRAIN_RX_OOS	11	/* drain the Rx out of sequence queue */
+#define RXRPC_CALL_LIFE_TIMER	12	/* call's lifetimer ran out */
+#define RXRPC_CALL_ACCEPTED	13	/* incoming call accepted by userspace app */
+#define RXRPC_CALL_SECURED	14	/* incoming call's connection is now secure */
+#define RXRPC_CALL_POST_ACCEPT	15	/* need to post an "accept?" message to the app */
+#define RXRPC_CALL_RELEASE	16	/* need to release the call's resources */
+
+	spinlock_t		lock;
+	rwlock_t		state_lock;	/* lock for state transition */
+	atomic_t		usage;
+	atomic_t		sequence;	/* Tx data packet sequence counter */
+	u32			abort_code;	/* local/remote abort code */
+	enum {					/* current state of call */
+		RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
+		RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
+		RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
+		RXRPC_CALL_CLIENT_FINAL_ACK,	/* - client sending final ACK phase */
+		RXRPC_CALL_SERVER_SECURING,	/* - server securing request connection */
+		RXRPC_CALL_SERVER_ACCEPTING,	/* - server accepting request */
+		RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
+		RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
+		RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
+		RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
+		RXRPC_CALL_COMPLETE,		/* - call completed */
+		RXRPC_CALL_SERVER_BUSY,		/* - call rejected by busy server */
+		RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
+		RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
+		RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
+		RXRPC_CALL_DEAD,		/* - call is dead */
+	} state;
+	int			debug_id;	/* debug ID for printks */
+	u8			channel;	/* connection channel occupied by this call */
+
+	/* transmission-phase ACK management */
+	uint8_t			acks_head;	/* offset into window of first entry */
+	uint8_t			acks_tail;	/* offset into window of last entry */
+	uint8_t			acks_winsz;	/* size of un-ACK'd window */
+	uint8_t			acks_unacked;	/* lowest unacked packet in last ACK received */
+	int			acks_latest;	/* serial number of latest ACK received */
+	rxrpc_seq_t		acks_hard;	/* highest definitively ACK'd msg seq */
+	unsigned long		*acks_window;	/* sent packet window
+						 * - elements are pointers with LSB set if ACK'd
+						 */
+
+	/* receive-phase ACK management */
+	rxrpc_seq_t		rx_data_expect;	/* next data seq ID expected to be received */
+	rxrpc_seq_t		rx_data_post;	/* next data seq ID expected to be posted */
+	rxrpc_seq_t		rx_data_recv;	/* last data seq ID encountered by recvmsg */
+	rxrpc_seq_t		rx_data_eaten;	/* last data seq ID consumed by recvmsg */
+	rxrpc_seq_t		rx_first_oos;	/* first packet in rx_oos_queue (or 0) */
+	rxrpc_seq_t		ackr_win_top;	/* top of ACK window (rx_data_eaten is bottom) */
+	rxrpc_seq_net_t		ackr_prev_seq;	/* previous sequence number received */
+	uint8_t			ackr_reason;	/* reason to ACK */
+	__be32			ackr_serial;	/* serial of packet being ACK'd */
+	atomic_t		ackr_not_idle;	/* number of packets in Rx queue */
+
+	/* received packet records, 1 bit per record */
+#define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
+	unsigned long		ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
+
+	/* the following should all be in net order */
+	__be32			cid;		/* connection ID + channel index  */
+	__be32			call_id;	/* call ID on connection  */
+};
+
+/*
+ * RxRPC key for Kerberos (type-2 security)
+ */
+struct rxkad_key {
+	u16	security_index;		/* RxRPC header security index */
+	u16	ticket_len;		/* length of ticket[] */
+	u32	expiry;			/* time at which expires */
+	u32	kvno;			/* key version number */
+	u8	session_key[8];		/* DES session key */
+	u8	ticket[0];		/* the encrypted ticket */
+};
+
+struct rxrpc_key_payload {
+	struct rxkad_key k;
+};
+
+/*
+ * locally abort an RxRPC call
+ */
+static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
+{
+	write_lock_bh(&call->state_lock);
+	if (call->state < RXRPC_CALL_COMPLETE) {
+		call->abort_code = abort_code;
+		call->state = RXRPC_CALL_LOCALLY_ABORTED;
+		set_bit(RXRPC_CALL_ABORT, &call->events);
+	}
+	write_unlock_bh(&call->state_lock);
+}
+
+/*
+ * put a packet up for transport-level abort
+ */
+static inline
+void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
+{
+	CHECK_SLAB_OKAY(&local->usage);
+	if (!atomic_inc_not_zero(&local->usage)) {
+		printk("resurrected on reject\n");
+		BUG();
+	}
+	skb_queue_tail(&local->reject_queue, skb);
+	schedule_work(&local->rejecter);
+}
+
+/*
+ * ar-accept.c
+ */
+extern void rxrpc_accept_incoming_calls(struct work_struct *);
+extern int rxrpc_accept_call(struct rxrpc_sock *, unsigned long);
+
+/*
+ * ar-ack.c
+ */
+extern void __rxrpc_propose_ACK(struct rxrpc_call *, uint8_t, __be32, bool);
+extern void rxrpc_propose_ACK(struct rxrpc_call *, uint8_t, __be32, bool);
+extern void rxrpc_process_call(struct work_struct *);
+
+/*
+ * ar-call.c
+ */
+extern struct kmem_cache *rxrpc_call_jar;
+extern struct list_head rxrpc_calls;
+extern rwlock_t rxrpc_call_lock;
+
+extern struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *,
+						struct rxrpc_transport *,
+						struct rxrpc_conn_bundle *,
+						unsigned long, int, gfp_t);
+extern struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
+					      struct rxrpc_connection *,
+					      struct rxrpc_header *, gfp_t);
+extern struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *,
+						 unsigned long);
+extern void rxrpc_release_call(struct rxrpc_call *);
+extern void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
+extern void __rxrpc_put_call(struct rxrpc_call *);
+extern void __exit rxrpc_destroy_all_calls(void);
+
+/*
+ * ar-connection.c
+ */
+extern struct list_head rxrpc_connections;
+extern rwlock_t rxrpc_connection_lock;
+
+extern struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *,
+						  struct rxrpc_transport *,
+						  struct key *,
+						  __be16, gfp_t);
+extern void rxrpc_put_bundle(struct rxrpc_transport *,
+			     struct rxrpc_conn_bundle *);
+extern int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_transport *,
+			      struct rxrpc_conn_bundle *, struct rxrpc_call *,
+			      gfp_t);
+extern void rxrpc_put_connection(struct rxrpc_connection *);
+extern void __exit rxrpc_destroy_all_connections(void);
+extern struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
+						      struct rxrpc_header *);
+extern struct rxrpc_connection *
+rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_header *,
+			  gfp_t);
+
+/*
+ * ar-connevent.c
+ */
+extern void rxrpc_process_connection(struct work_struct *);
+extern void rxrpc_reject_packets(struct work_struct *);
+
+/*
+ * ar-error.c
+ */
+extern void rxrpc_UDP_error_report(struct sock *);
+extern void rxrpc_UDP_error_handler(struct work_struct *);
+
+/*
+ * ar-input.c
+ */
+extern unsigned long rxrpc_ack_timeout;
+extern const char *rxrpc_pkts[];
+
+extern void rxrpc_data_ready(struct sock *, int);
+extern int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool,
+			       bool);
+extern void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
+
+/*
+ * ar-local.c
+ */
+extern rwlock_t rxrpc_local_lock;
+extern struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *);
+extern void rxrpc_put_local(struct rxrpc_local *);
+extern void __exit rxrpc_destroy_all_locals(void);
+
+/*
+ * ar-key.c
+ */
+extern struct key_type key_type_rxrpc;
+extern struct key_type key_type_rxrpc_s;
+
+extern int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
+extern int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
+extern int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *,
+				     time_t, u32);
+
+/*
+ * ar-output.c
+ */
+extern int rxrpc_resend_timeout;
+
+extern int rxrpc_send_packet(struct rxrpc_transport *, struct sk_buff *);
+extern int rxrpc_client_sendmsg(struct kiocb *, struct rxrpc_sock *,
+				struct rxrpc_transport *, struct msghdr *,
+				size_t);
+extern int rxrpc_server_sendmsg(struct kiocb *, struct rxrpc_sock *,
+				struct msghdr *, size_t);
+
+/*
+ * ar-peer.c
+ */
+extern struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *, gfp_t);
+extern void rxrpc_put_peer(struct rxrpc_peer *);
+extern struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *,
+					  __be32, __be16);
+extern void __exit rxrpc_destroy_all_peers(void);
+
+/*
+ * ar-proc.c
+ */
+extern const char *rxrpc_call_states[];
+extern struct file_operations rxrpc_call_seq_fops;
+extern struct file_operations rxrpc_connection_seq_fops;
+
+/*
+ * ar-recvmsg.c
+ */
+extern int rxrpc_recvmsg(struct kiocb *, struct socket *, struct msghdr *,
+			 size_t, int);
+
+/*
+ * ar-security.c
+ */
+extern int rxrpc_register_security(struct rxrpc_security *);
+extern void rxrpc_unregister_security(struct rxrpc_security *);
+extern int rxrpc_init_client_conn_security(struct rxrpc_connection *);
+extern int rxrpc_init_server_conn_security(struct rxrpc_connection *);
+extern int rxrpc_secure_packet(const struct rxrpc_call *, struct sk_buff *,
+			       size_t, void *);
+extern int rxrpc_verify_packet(const struct rxrpc_call *, struct sk_buff *,
+			       u32 *);
+extern void rxrpc_clear_conn_security(struct rxrpc_connection *);
+
+/*
+ * ar-skbuff.c
+ */
+extern void rxrpc_packet_destructor(struct sk_buff *);
+
+/*
+ * ar-transport.c
+ */
+extern struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
+						   struct rxrpc_peer *,
+						   gfp_t);
+extern void rxrpc_put_transport(struct rxrpc_transport *);
+extern void __exit rxrpc_destroy_all_transports(void);
+extern struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
+						    struct rxrpc_peer *);
+
+/*
+ * debug tracing
+ */
+extern unsigned rxrpc_debug;
+
+#define dbgprintk(FMT,...) \
+	printk("[%x%-6.6s] "FMT"\n", smp_processor_id(), current->comm ,##__VA_ARGS__)
+
+/* make sure we maintain the format strings, even when debugging is disabled */
+static inline __attribute__((format(printf,1,2)))
+void _dbprintk(const char *fmt, ...)
+{
+}
+
+#define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
+#define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
+#define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
+#define kproto(FMT,...)	dbgprintk("### "FMT ,##__VA_ARGS__)
+#define knet(FMT,...)	dbgprintk("@@@ "FMT ,##__VA_ARGS__)
+
+
+#if defined(__KDEBUG)
+#define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
+#define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
+#define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
+#define _proto(FMT,...)	kproto(FMT,##__VA_ARGS__)
+#define _net(FMT,...)	knet(FMT,##__VA_ARGS__)
+
+#elif defined(CONFIG_AF_RXRPC_DEBUG)
+#define RXRPC_DEBUG_KENTER	0x01
+#define RXRPC_DEBUG_KLEAVE	0x02
+#define RXRPC_DEBUG_KDEBUG	0x04
+#define RXRPC_DEBUG_KPROTO	0x08
+#define RXRPC_DEBUG_KNET	0x10
+
+#define _enter(FMT,...)					\
+do {							\
+	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER))	\
+		kenter(FMT,##__VA_ARGS__);		\
+} while (0)
+
+#define _leave(FMT,...)					\
+do {							\
+	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE))	\
+		kleave(FMT,##__VA_ARGS__);		\
+} while (0)
+
+#define _debug(FMT,...)					\
+do {							\
+	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG))	\
+		kdebug(FMT,##__VA_ARGS__);		\
+} while (0)
+
+#define _proto(FMT,...)					\
+do {							\
+	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO))	\
+		kproto(FMT,##__VA_ARGS__);		\
+} while (0)
+
+#define _net(FMT,...)					\
+do {							\
+	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))	\
+		knet(FMT,##__VA_ARGS__);		\
+} while (0)
+
+#else
+#define _enter(FMT,...)	_dbprintk("==> %s("FMT")",__FUNCTION__ ,##__VA_ARGS__)
+#define _leave(FMT,...)	_dbprintk("<== %s()"FMT"",__FUNCTION__ ,##__VA_ARGS__)
+#define _debug(FMT,...)	_dbprintk("    "FMT ,##__VA_ARGS__)
+#define _proto(FMT,...)	_dbprintk("### "FMT ,##__VA_ARGS__)
+#define _net(FMT,...)	_dbprintk("@@@ "FMT ,##__VA_ARGS__)
+#endif
+
+/*
+ * debug assertion checking
+ */
+#if 1 // defined(__KDEBUGALL)
+
+#define ASSERT(X)						\
+do {								\
+	if (unlikely(!(X))) {					\
+		printk(KERN_ERR "\n");				\
+		printk(KERN_ERR "RxRPC: Assertion failed\n");	\
+		BUG();						\
+	}							\
+} while(0)
+
+#define ASSERTCMP(X, OP, Y)						\
+do {									\
+	if (unlikely(!((X) OP (Y)))) {					\
+		printk(KERN_ERR "\n");					\
+		printk(KERN_ERR "RxRPC: Assertion failed\n");		\
+		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
+		       (unsigned long)(X), (unsigned long)(Y));		\
+		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
+		       (unsigned long)(X), (unsigned long)(Y));		\
+		BUG();							\
+	}								\
+} while(0)
+
+#define ASSERTIF(C, X)						\
+do {								\
+	if (unlikely((C) && !(X))) {				\
+		printk(KERN_ERR "\n");				\
+		printk(KERN_ERR "RxRPC: Assertion failed\n");	\
+		BUG();						\
+	}							\
+} while(0)
+
+#define ASSERTIFCMP(C, X, OP, Y)					\
+do {									\
+	if (unlikely((C) && !((X) OP (Y)))) {				\
+		printk(KERN_ERR "\n");					\
+		printk(KERN_ERR "RxRPC: Assertion failed\n");		\
+		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
+		       (unsigned long)(X), (unsigned long)(Y));		\
+		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
+		       (unsigned long)(X), (unsigned long)(Y));		\
+		BUG();							\
+	}								\
+} while(0)
+
+#else
+
+#define ASSERT(X)				\
+do {						\
+} while(0)
+
+#define ASSERTCMP(X, OP, Y)			\
+do {						\
+} while(0)
+
+#define ASSERTIF(C, X)				\
+do {						\
+} while(0)
+
+#define ASSERTIFCMP(C, X, OP, Y)		\
+do {						\
+} while(0)
+
+#endif /* __KDEBUGALL */
+
+/*
+ * socket buffer accounting / leak finding
+ */
+static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
+{
+	//_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
+	//atomic_inc(&rxrpc_n_skbs);
+}
+
+#define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
+
+static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
+{
+	//_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
+	//atomic_dec(&rxrpc_n_skbs);
+}
+
+#define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
+
+static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
+{
+	if (skb) {
+		CHECK_SLAB_OKAY(&skb->users);
+		//_net("free skb %p %s [%d]",
+		//     skb, fn, atomic_read(&rxrpc_n_skbs));
+		//atomic_dec(&rxrpc_n_skbs);
+		kfree_skb(skb);
+	}
+}
+
+#define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
+
+static inline void rxrpc_purge_queue(struct sk_buff_head *list)
+{
+	struct sk_buff *skb;
+	while ((skb = skb_dequeue((list))) != NULL)
+		rxrpc_free_skb(skb);
+}
+
+static inline void __rxrpc__atomic_inc(atomic_t *v)
+{
+	CHECK_SLAB_OKAY(v);
+	atomic_inc(v);
+}
+
+#define atomic_inc(v) __rxrpc__atomic_inc((v))
+
+static inline void __rxrpc__atomic_dec(atomic_t *v)
+{
+	CHECK_SLAB_OKAY(v);
+	atomic_dec(v);
+}
+
+#define atomic_dec(v) __rxrpc__atomic_dec((v))
+
+static inline int __rxrpc__atomic_dec_and_test(atomic_t *v)
+{
+	CHECK_SLAB_OKAY(v);
+	return atomic_dec_and_test(v);
+}
+
+#define atomic_dec_and_test(v) __rxrpc__atomic_dec_and_test((v))
+
+static inline void __rxrpc_get_local(struct rxrpc_local *local, const char *f)
+{
+	CHECK_SLAB_OKAY(&local->usage);
+	if (atomic_inc_return(&local->usage) == 1)
+		printk("resurrected (%s)\n", f);
+}
+
+#define rxrpc_get_local(LOCAL) __rxrpc_get_local((LOCAL), __func__)
+
+#define rxrpc_get_call(CALL)				\
+do {							\
+	CHECK_SLAB_OKAY(&(CALL)->usage);		\
+	if (atomic_inc_return(&(CALL)->usage) == 1)	\
+		BUG();					\
+} while(0)
+
+#define rxrpc_put_call(CALL)				\
+do {							\
+	__rxrpc_put_call(CALL);				\
+} while(0)
diff --git a/net/rxrpc/ar-key.c b/net/rxrpc/ar-key.c
new file mode 100644
index 0000000..7e049ff
--- /dev/null
+++ b/net/rxrpc/ar-key.c
@@ -0,0 +1,334 @@
+/* RxRPC key management
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * RxRPC keys should have a description of describing their purpose:
+ *	"afs@CAMBRIDGE.REDHAT.COM>
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/key.h>
+#include <linux/crypto.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <keys/rxrpc-type.h>
+#include <keys/user-type.h>
+#include "ar-internal.h"
+
+static int rxrpc_instantiate(struct key *, const void *, size_t);
+static int rxrpc_instantiate_s(struct key *, const void *, size_t);
+static void rxrpc_destroy(struct key *);
+static void rxrpc_destroy_s(struct key *);
+static void rxrpc_describe(const struct key *, struct seq_file *);
+
+/*
+ * rxrpc defined keys take an arbitrary string as the description and an
+ * arbitrary blob of data as the payload
+ */
+struct key_type key_type_rxrpc = {
+	.name		= "rxrpc",
+	.instantiate	= rxrpc_instantiate,
+	.match		= user_match,
+	.destroy	= rxrpc_destroy,
+	.describe	= rxrpc_describe,
+};
+
+EXPORT_SYMBOL(key_type_rxrpc);
+
+/*
+ * rxrpc server defined keys take "<serviceId>:<securityIndex>" as the
+ * description and an 8-byte decryption key as the payload
+ */
+struct key_type key_type_rxrpc_s = {
+	.name		= "rxrpc_s",
+	.instantiate	= rxrpc_instantiate_s,
+	.match		= user_match,
+	.destroy	= rxrpc_destroy_s,
+	.describe	= rxrpc_describe,
+};
+
+/*
+ * instantiate an rxrpc defined key
+ * data should be of the form:
+ *	OFFSET	LEN	CONTENT
+ *	0	4	key interface version number
+ *	4	2	security index (type)
+ *	6	2	ticket length
+ *	8	4	key expiry time (time_t)
+ *	12	4	kvno
+ *	16	8	session key
+ *	24	[len]	ticket
+ *
+ * if no data is provided, then a no-security key is made
+ */
+static int rxrpc_instantiate(struct key *key, const void *data, size_t datalen)
+{
+	const struct rxkad_key *tsec;
+	struct rxrpc_key_payload *upayload;
+	size_t plen;
+	u32 kver;
+	int ret;
+
+	_enter("{%x},,%zu", key_serial(key), datalen);
+
+	/* handle a no-security key */
+	if (!data && datalen == 0)
+		return 0;
+
+	/* get the key interface version number */
+	ret = -EINVAL;
+	if (datalen <= 4 || !data)
+		goto error;
+	memcpy(&kver, data, sizeof(kver));
+	data += sizeof(kver);
+	datalen -= sizeof(kver);
+
+	_debug("KEY I/F VERSION: %u", kver);
+
+	ret = -EKEYREJECTED;
+	if (kver != 1)
+		goto error;
+
+	/* deal with a version 1 key */
+	ret = -EINVAL;
+	if (datalen < sizeof(*tsec))
+		goto error;
+
+	tsec = data;
+	if (datalen != sizeof(*tsec) + tsec->ticket_len)
+		goto error;
+
+	_debug("SCIX: %u", tsec->security_index);
+	_debug("TLEN: %u", tsec->ticket_len);
+	_debug("EXPY: %x", tsec->expiry);
+	_debug("KVNO: %u", tsec->kvno);
+	_debug("SKEY: %02x%02x%02x%02x%02x%02x%02x%02x",
+	       tsec->session_key[0], tsec->session_key[1],
+	       tsec->session_key[2], tsec->session_key[3],
+	       tsec->session_key[4], tsec->session_key[5],
+	       tsec->session_key[6], tsec->session_key[7]);
+	if (tsec->ticket_len >= 8)
+		_debug("TCKT: %02x%02x%02x%02x%02x%02x%02x%02x",
+		       tsec->ticket[0], tsec->ticket[1],
+		       tsec->ticket[2], tsec->ticket[3],
+		       tsec->ticket[4], tsec->ticket[5],
+		       tsec->ticket[6], tsec->ticket[7]);
+
+	ret = -EPROTONOSUPPORT;
+	if (tsec->security_index != 2)
+		goto error;
+
+	key->type_data.x[0] = tsec->security_index;
+
+	plen = sizeof(*upayload) + tsec->ticket_len;
+	ret = key_payload_reserve(key, plen);
+	if (ret < 0)
+		goto error;
+
+	ret = -ENOMEM;
+	upayload = kmalloc(plen, GFP_KERNEL);
+	if (!upayload)
+		goto error;
+
+	/* attach the data */
+	memcpy(&upayload->k, tsec, sizeof(*tsec));
+	memcpy(&upayload->k.ticket, (void *)tsec + sizeof(*tsec),
+	       tsec->ticket_len);
+	key->payload.data = upayload;
+	key->expiry = tsec->expiry;
+	ret = 0;
+
+error:
+	return ret;
+}
+
+/*
+ * instantiate a server secret key
+ * data should be a pointer to the 8-byte secret key
+ */
+static int rxrpc_instantiate_s(struct key *key, const void *data,
+			       size_t datalen)
+{
+	struct crypto_blkcipher *ci;
+
+	_enter("{%x},,%zu", key_serial(key), datalen);
+
+	if (datalen != 8)
+		return -EINVAL;
+
+	memcpy(&key->type_data, data, 8);
+
+	ci = crypto_alloc_blkcipher("pcbc(des)", 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(ci)) {
+		_leave(" = %ld", PTR_ERR(ci));
+		return PTR_ERR(ci);
+	}
+
+	if (crypto_blkcipher_setkey(ci, data, 8) < 0)
+		BUG();
+
+	key->payload.data = ci;
+	_leave(" = 0");
+	return 0;
+}
+
+/*
+ * dispose of the data dangling from the corpse of a rxrpc key
+ */
+static void rxrpc_destroy(struct key *key)
+{
+	kfree(key->payload.data);
+}
+
+/*
+ * dispose of the data dangling from the corpse of a rxrpc key
+ */
+static void rxrpc_destroy_s(struct key *key)
+{
+	if (key->payload.data) {
+		crypto_free_blkcipher(key->payload.data);
+		key->payload.data = NULL;
+	}
+}
+
+/*
+ * describe the rxrpc key
+ */
+static void rxrpc_describe(const struct key *key, struct seq_file *m)
+{
+	seq_puts(m, key->description);
+}
+
+/*
+ * grab the security key for a socket
+ */
+int rxrpc_request_key(struct rxrpc_sock *rx, char __user *optval, int optlen)
+{
+	struct key *key;
+	char *description;
+
+	_enter("");
+
+	if (optlen <= 0 || optlen > PAGE_SIZE - 1)
+		return -EINVAL;
+
+	description = kmalloc(optlen + 1, GFP_KERNEL);
+	if (!description)
+		return -ENOMEM;
+
+	if (copy_from_user(description, optval, optlen)) {
+		kfree(description);
+		return -EFAULT;
+	}
+	description[optlen] = 0;
+
+	key = request_key(&key_type_rxrpc, description, NULL);
+	if (IS_ERR(key)) {
+		kfree(description);
+		_leave(" = %ld", PTR_ERR(key));
+		return PTR_ERR(key);
+	}
+
+	rx->key = key;
+	kfree(description);
+	_leave(" = 0 [key %x]", key->serial);
+	return 0;
+}
+
+/*
+ * grab the security keyring for a server socket
+ */
+int rxrpc_server_keyring(struct rxrpc_sock *rx, char __user *optval,
+			 int optlen)
+{
+	struct key *key;
+	char *description;
+
+	_enter("");
+
+	if (optlen <= 0 || optlen > PAGE_SIZE - 1)
+		return -EINVAL;
+
+	description = kmalloc(optlen + 1, GFP_KERNEL);
+	if (!description)
+		return -ENOMEM;
+
+	if (copy_from_user(description, optval, optlen)) {
+		kfree(description);
+		return -EFAULT;
+	}
+	description[optlen] = 0;
+
+	key = request_key(&key_type_keyring, description, NULL);
+	if (IS_ERR(key)) {
+		kfree(description);
+		_leave(" = %ld", PTR_ERR(key));
+		return PTR_ERR(key);
+	}
+
+	rx->securities = key;
+	kfree(description);
+	_leave(" = 0 [key %x]", key->serial);
+	return 0;
+}
+
+/*
+ * generate a server data key
+ */
+int rxrpc_get_server_data_key(struct rxrpc_connection *conn,
+			      const void *session_key,
+			      time_t expiry,
+			      u32 kvno)
+{
+	struct key *key;
+	int ret;
+
+	struct {
+		u32 kver;
+		struct rxkad_key tsec;
+	} data;
+
+	_enter("");
+
+	key = key_alloc(&key_type_rxrpc, "x", 0, 0, current, 0,
+			KEY_ALLOC_NOT_IN_QUOTA);
+	if (IS_ERR(key)) {
+		_leave(" = -ENOMEM [alloc %ld]", PTR_ERR(key));
+		return -ENOMEM;
+	}
+
+	_debug("key %d", key_serial(key));
+
+	data.kver = 1;
+	data.tsec.security_index = 2;
+	data.tsec.ticket_len = 0;
+	data.tsec.expiry = expiry;
+	data.tsec.kvno = 0;
+
+	memcpy(&data.tsec.session_key, session_key,
+	       sizeof(data.tsec.session_key));
+
+	ret = key_instantiate_and_link(key, &data, sizeof(data), NULL, NULL);
+	if (ret < 0)
+		goto error;
+
+	conn->key = key;
+	_leave(" = 0 [%d]", key_serial(key));
+	return 0;
+
+error:
+	key_revoke(key);
+	key_put(key);
+	_leave(" = -ENOMEM [ins %d]", ret);
+	return -ENOMEM;
+}
+
+EXPORT_SYMBOL(rxrpc_get_server_data_key);
diff --git a/net/rxrpc/ar-local.c b/net/rxrpc/ar-local.c
new file mode 100644
index 0000000..a20a2c0
--- /dev/null
+++ b/net/rxrpc/ar-local.c
@@ -0,0 +1,309 @@
+/* AF_RXRPC local endpoint management
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+static LIST_HEAD(rxrpc_locals);
+DEFINE_RWLOCK(rxrpc_local_lock);
+static DECLARE_RWSEM(rxrpc_local_sem);
+static DECLARE_WAIT_QUEUE_HEAD(rxrpc_local_wq);
+
+static void rxrpc_destroy_local(struct work_struct *work);
+
+/*
+ * allocate a new local
+ */
+static
+struct rxrpc_local *rxrpc_alloc_local(struct sockaddr_rxrpc *srx)
+{
+	struct rxrpc_local *local;
+
+	local = kzalloc(sizeof(struct rxrpc_local), GFP_KERNEL);
+	if (local) {
+		INIT_WORK(&local->destroyer, &rxrpc_destroy_local);
+		INIT_WORK(&local->acceptor, &rxrpc_accept_incoming_calls);
+		INIT_WORK(&local->rejecter, &rxrpc_reject_packets);
+		INIT_LIST_HEAD(&local->services);
+		INIT_LIST_HEAD(&local->link);
+		init_rwsem(&local->defrag_sem);
+		skb_queue_head_init(&local->accept_queue);
+		skb_queue_head_init(&local->reject_queue);
+		spin_lock_init(&local->lock);
+		rwlock_init(&local->services_lock);
+		atomic_set(&local->usage, 1);
+		local->debug_id = atomic_inc_return(&rxrpc_debug_id);
+		memcpy(&local->srx, srx, sizeof(*srx));
+	}
+
+	_leave(" = %p", local);
+	return local;
+}
+
+/*
+ * create the local socket
+ * - must be called with rxrpc_local_sem writelocked
+ */
+static int rxrpc_create_local(struct rxrpc_local *local)
+{
+	struct sock *sock;
+	int ret, opt;
+
+	_enter("%p{%d}", local, local->srx.transport_type);
+
+	/* create a socket to represent the local endpoint */
+	ret = sock_create_kern(PF_INET, local->srx.transport_type, IPPROTO_UDP,
+			       &local->socket);
+	if (ret < 0) {
+		_leave(" = %d [socket]", ret);
+		return ret;
+	}
+
+	/* if a local address was supplied then bind it */
+	if (local->srx.transport_len > sizeof(sa_family_t)) {
+		_debug("bind");
+		ret = kernel_bind(local->socket,
+				  (struct sockaddr *) &local->srx.transport,
+				  local->srx.transport_len);
+		if (ret < 0) {
+			_debug("bind failed");
+			goto error;
+		}
+	}
+
+	/* we want to receive ICMP errors */
+	opt = 1;
+	ret = kernel_setsockopt(local->socket, SOL_IP, IP_RECVERR,
+				(char *) &opt, sizeof(opt));
+	if (ret < 0) {
+		_debug("setsockopt failed");
+		goto error;
+	}
+
+	/* we want to set the don't fragment bit */
+	opt = IP_PMTUDISC_DO;
+	ret = kernel_setsockopt(local->socket, SOL_IP, IP_MTU_DISCOVER,
+				(char *) &opt, sizeof(opt));
+	if (ret < 0) {
+		_debug("setsockopt failed");
+		goto error;
+	}
+
+	write_lock_bh(&rxrpc_local_lock);
+	list_add(&local->link, &rxrpc_locals);
+	write_unlock_bh(&rxrpc_local_lock);
+
+	/* set the socket up */
+	sock = local->socket->sk;
+	sock->sk_user_data	= local;
+	sock->sk_data_ready	= rxrpc_data_ready;
+	sock->sk_error_report	= rxrpc_UDP_error_report;
+	_leave(" = 0");
+	return 0;
+
+error:
+	local->socket->ops->shutdown(local->socket, 2);
+	local->socket->sk->sk_user_data = NULL;
+	sock_release(local->socket);
+	local->socket = NULL;
+
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * create a new local endpoint using the specified UDP address
+ */
+struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *srx)
+{
+	struct rxrpc_local *local;
+	int ret;
+
+	_enter("{%d,%u,%u.%u.%u.%u+%hu}",
+	       srx->transport_type,
+	       srx->transport.family,
+	       NIPQUAD(srx->transport.sin.sin_addr),
+	       ntohs(srx->transport.sin.sin_port));
+
+	down_write(&rxrpc_local_sem);
+
+	/* see if we have a suitable local local endpoint already */
+	read_lock_bh(&rxrpc_local_lock);
+
+	list_for_each_entry(local, &rxrpc_locals, link) {
+		_debug("CMP {%d,%u,%u.%u.%u.%u+%hu}",
+		       local->srx.transport_type,
+		       local->srx.transport.family,
+		       NIPQUAD(local->srx.transport.sin.sin_addr),
+		       ntohs(local->srx.transport.sin.sin_port));
+
+		if (local->srx.transport_type != srx->transport_type ||
+		    local->srx.transport.family != srx->transport.family)
+			continue;
+
+		switch (srx->transport.family) {
+		case AF_INET:
+			if (local->srx.transport.sin.sin_port !=
+			    srx->transport.sin.sin_port)
+				continue;
+			if (memcmp(&local->srx.transport.sin.sin_addr,
+				   &srx->transport.sin.sin_addr,
+				   sizeof(struct in_addr)) != 0)
+				continue;
+			goto found_local;
+
+		default:
+			BUG();
+		}
+	}
+
+	read_unlock_bh(&rxrpc_local_lock);
+
+	/* we didn't find one, so we need to create one */
+	local = rxrpc_alloc_local(srx);
+	if (!local) {
+		up_write(&rxrpc_local_sem);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	ret = rxrpc_create_local(local);
+	if (ret < 0) {
+		up_write(&rxrpc_local_sem);
+		kfree(local);
+		_leave(" = %d", ret);
+		return ERR_PTR(ret);
+	}
+
+	up_write(&rxrpc_local_sem);
+
+	_net("LOCAL new %d {%d,%u,%u.%u.%u.%u+%hu}",
+	     local->debug_id,
+	     local->srx.transport_type,
+	     local->srx.transport.family,
+	     NIPQUAD(local->srx.transport.sin.sin_addr),
+	     ntohs(local->srx.transport.sin.sin_port));
+
+	_leave(" = %p [new]", local);
+	return local;
+
+found_local:
+	rxrpc_get_local(local);
+	read_unlock_bh(&rxrpc_local_lock);
+	up_write(&rxrpc_local_sem);
+
+	_net("LOCAL old %d {%d,%u,%u.%u.%u.%u+%hu}",
+	     local->debug_id,
+	     local->srx.transport_type,
+	     local->srx.transport.family,
+	     NIPQUAD(local->srx.transport.sin.sin_addr),
+	     ntohs(local->srx.transport.sin.sin_port));
+
+	_leave(" = %p [reuse]", local);
+	return local;
+}
+
+/*
+ * release a local endpoint
+ */
+void rxrpc_put_local(struct rxrpc_local *local)
+{
+	_enter("%p{u=%d}", local, atomic_read(&local->usage));
+
+	ASSERTCMP(atomic_read(&local->usage), >, 0);
+
+	/* to prevent a race, the decrement and the dequeue must be effectively
+	 * atomic */
+	write_lock_bh(&rxrpc_local_lock);
+	if (unlikely(atomic_dec_and_test(&local->usage))) {
+		_debug("destroy local");
+		schedule_work(&local->destroyer);
+	}
+	write_unlock_bh(&rxrpc_local_lock);
+	_leave("");
+}
+
+/*
+ * destroy a local endpoint
+ */
+static void rxrpc_destroy_local(struct work_struct *work)
+{
+	struct rxrpc_local *local =
+		container_of(work, struct rxrpc_local, destroyer);
+
+	_enter("%p{%d}", local, atomic_read(&local->usage));
+
+	down_write(&rxrpc_local_sem);
+
+	write_lock_bh(&rxrpc_local_lock);
+	if (atomic_read(&local->usage) > 0) {
+		write_unlock_bh(&rxrpc_local_lock);
+		up_read(&rxrpc_local_sem);
+		_leave(" [resurrected]");
+		return;
+	}
+
+	list_del(&local->link);
+	local->socket->sk->sk_user_data = NULL;
+	write_unlock_bh(&rxrpc_local_lock);
+
+	downgrade_write(&rxrpc_local_sem);
+
+	ASSERT(list_empty(&local->services));
+	ASSERT(!work_pending(&local->acceptor));
+	ASSERT(!work_pending(&local->rejecter));
+
+	/* finish cleaning up the local descriptor */
+	rxrpc_purge_queue(&local->accept_queue);
+	rxrpc_purge_queue(&local->reject_queue);
+	local->socket->ops->shutdown(local->socket, 2);
+	sock_release(local->socket);
+
+	up_read(&rxrpc_local_sem);
+
+	_net("DESTROY LOCAL %d", local->debug_id);
+	kfree(local);
+
+	if (list_empty(&rxrpc_locals))
+		wake_up_all(&rxrpc_local_wq);
+
+	_leave("");
+}
+
+/*
+ * preemptively destroy all local local endpoint rather than waiting for
+ * them to be destroyed
+ */
+void __exit rxrpc_destroy_all_locals(void)
+{
+	DECLARE_WAITQUEUE(myself,current);
+
+	_enter("");
+
+	/* we simply have to wait for them to go away */
+	if (!list_empty(&rxrpc_locals)) {
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		add_wait_queue(&rxrpc_local_wq, &myself);
+
+		while (!list_empty(&rxrpc_locals)) {
+			schedule();
+			set_current_state(TASK_UNINTERRUPTIBLE);
+		}
+
+		remove_wait_queue(&rxrpc_local_wq, &myself);
+		set_current_state(TASK_RUNNING);
+	}
+
+	_leave("");
+}
diff --git a/net/rxrpc/ar-output.c b/net/rxrpc/ar-output.c
new file mode 100644
index 0000000..67aa951
--- /dev/null
+++ b/net/rxrpc/ar-output.c
@@ -0,0 +1,658 @@
+/* RxRPC packet transmission
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/circ_buf.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+int rxrpc_resend_timeout = 4;
+
+static int rxrpc_send_data(struct kiocb *iocb,
+			   struct rxrpc_sock *rx,
+			   struct rxrpc_call *call,
+			   struct msghdr *msg, size_t len);
+
+/*
+ * extract control messages from the sendmsg() control buffer
+ */
+static int rxrpc_sendmsg_cmsg(struct rxrpc_sock *rx, struct msghdr *msg,
+			      unsigned long *user_call_ID,
+			      enum rxrpc_command *command,
+			      u32 *abort_code,
+			      bool server)
+{
+	struct cmsghdr *cmsg;
+	int len;
+
+	*command = RXRPC_CMD_SEND_DATA;
+
+	if (msg->msg_controllen == 0)
+		return -EINVAL;
+
+	for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
+		if (!CMSG_OK(msg, cmsg))
+			return -EINVAL;
+
+		len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
+		_debug("CMSG %d, %d, %d",
+		       cmsg->cmsg_level, cmsg->cmsg_type, len);
+
+		if (cmsg->cmsg_level != SOL_RXRPC)
+			continue;
+
+		switch (cmsg->cmsg_type) {
+		case RXRPC_USER_CALL_ID:
+			if (msg->msg_flags & MSG_CMSG_COMPAT) {
+				if (len != sizeof(u32))
+					return -EINVAL;
+				*user_call_ID = *(u32 *) CMSG_DATA(cmsg);
+			} else {
+				if (len != sizeof(unsigned long))
+					return -EINVAL;
+				*user_call_ID = *(unsigned long *)
+					CMSG_DATA(cmsg);
+			}
+			_debug("User Call ID %lx", *user_call_ID);
+			break;
+
+		case RXRPC_ABORT:
+			if (*command != RXRPC_CMD_SEND_DATA)
+				return -EINVAL;
+			*command = RXRPC_CMD_SEND_ABORT;
+			if (len != sizeof(*abort_code))
+				return -EINVAL;
+			*abort_code = *(unsigned int *) CMSG_DATA(cmsg);
+			_debug("Abort %x", *abort_code);
+			if (*abort_code == 0)
+				return -EINVAL;
+			break;
+
+		case RXRPC_ACCEPT:
+			if (*command != RXRPC_CMD_SEND_DATA)
+				return -EINVAL;
+			*command = RXRPC_CMD_ACCEPT;
+			if (len != 0)
+				return -EINVAL;
+			if (!server)
+				return -EISCONN;
+			break;
+
+		default:
+			return -EINVAL;
+		}
+	}
+
+	_leave(" = 0");
+	return 0;
+}
+
+/*
+ * abort a call, sending an ABORT packet to the peer
+ */
+static void rxrpc_send_abort(struct rxrpc_call *call, u32 abort_code)
+{
+	write_lock_bh(&call->state_lock);
+
+	if (call->state <= RXRPC_CALL_COMPLETE) {
+		call->state = RXRPC_CALL_LOCALLY_ABORTED;
+		call->abort_code = abort_code;
+		set_bit(RXRPC_CALL_ABORT, &call->events);
+		del_timer_sync(&call->resend_timer);
+		del_timer_sync(&call->ack_timer);
+		clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events);
+		clear_bit(RXRPC_CALL_ACK, &call->events);
+		clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+		schedule_work(&call->processor);
+	}
+
+	write_unlock_bh(&call->state_lock);
+}
+
+/*
+ * send a message forming part of a client call through an RxRPC socket
+ * - caller holds the socket locked
+ * - the socket may be either a client socket or a server socket
+ */
+int rxrpc_client_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx,
+			 struct rxrpc_transport *trans, struct msghdr *msg,
+			 size_t len)
+{
+	struct rxrpc_conn_bundle *bundle;
+	enum rxrpc_command cmd;
+	struct rxrpc_call *call;
+	unsigned long user_call_ID = 0;
+	struct key *key;
+	__be16 service_id;
+	u32 abort_code = 0;
+	int ret;
+
+	_enter("");
+
+	ASSERT(trans != NULL);
+
+	ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code,
+				 false);
+	if (ret < 0)
+		return ret;
+
+	bundle = NULL;
+	if (trans) {
+		service_id = rx->service_id;
+		if (msg->msg_name) {
+			struct sockaddr_rxrpc *srx =
+				(struct sockaddr_rxrpc *) msg->msg_name;
+			service_id = htons(srx->srx_service);
+		}
+		key = rx->key;
+		if (key && !rx->key->payload.data)
+			key = NULL;
+		bundle = rxrpc_get_bundle(rx, trans, key, service_id,
+					  GFP_KERNEL);
+		if (IS_ERR(bundle))
+			return PTR_ERR(bundle);
+	}
+
+	call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID,
+				     abort_code == 0, GFP_KERNEL);
+	if (trans)
+		rxrpc_put_bundle(trans, bundle);
+	if (IS_ERR(call)) {
+		_leave(" = %ld", PTR_ERR(call));
+		return PTR_ERR(call);
+	}
+
+	_debug("CALL %d USR %lx ST %d on CONN %p",
+	       call->debug_id, call->user_call_ID, call->state, call->conn);
+
+	if (call->state >= RXRPC_CALL_COMPLETE) {
+		/* it's too late for this call */
+		ret = -ESHUTDOWN;
+	} else if (cmd == RXRPC_CMD_SEND_ABORT) {
+		rxrpc_send_abort(call, abort_code);
+	} else if (cmd != RXRPC_CMD_SEND_DATA) {
+		ret = -EINVAL;
+	} else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
+		/* request phase complete for this client call */
+		ret = -EPROTO;
+	} else {
+		ret = rxrpc_send_data(iocb, rx, call, msg, len);
+	}
+
+	rxrpc_put_call(call);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * send a message through a server socket
+ * - caller holds the socket locked
+ */
+int rxrpc_server_sendmsg(struct kiocb *iocb, struct rxrpc_sock *rx,
+			 struct msghdr *msg, size_t len)
+{
+	enum rxrpc_command cmd;
+	struct rxrpc_call *call;
+	unsigned long user_call_ID = 0;
+	u32 abort_code = 0;
+	int ret;
+
+	_enter("");
+
+	ret = rxrpc_sendmsg_cmsg(rx, msg, &user_call_ID, &cmd, &abort_code,
+				 true);
+	if (ret < 0)
+		return ret;
+
+	if (cmd == RXRPC_CMD_ACCEPT)
+		return rxrpc_accept_call(rx, user_call_ID);
+
+	call = rxrpc_find_server_call(rx, user_call_ID);
+	if (!call)
+		return -EBADSLT;
+	if (call->state >= RXRPC_CALL_COMPLETE) {
+		ret = -ESHUTDOWN;
+		goto out;
+	}
+
+	switch (cmd) {
+	case RXRPC_CMD_SEND_DATA:
+		if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST &&
+		    call->state != RXRPC_CALL_SERVER_ACK_REQUEST &&
+		    call->state != RXRPC_CALL_SERVER_SEND_REPLY) {
+			/* Tx phase not yet begun for this call */
+			ret = -EPROTO;
+			break;
+		}
+
+		ret = rxrpc_send_data(iocb, rx, call, msg, len);
+		break;
+
+	case RXRPC_CMD_SEND_ABORT:
+		rxrpc_send_abort(call, abort_code);
+		break;
+	default:
+		BUG();
+	}
+
+	out:
+	rxrpc_put_call(call);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * send a packet through the transport endpoint
+ */
+int rxrpc_send_packet(struct rxrpc_transport *trans, struct sk_buff *skb)
+{
+	struct kvec iov[1];
+	struct msghdr msg;
+	int ret, opt;
+
+	_enter(",{%d}", skb->len);
+
+	iov[0].iov_base = skb->head;
+	iov[0].iov_len = skb->len;
+
+	msg.msg_name = &trans->peer->srx.transport.sin;
+	msg.msg_namelen = sizeof(trans->peer->srx.transport.sin);
+	msg.msg_control = NULL;
+	msg.msg_controllen = 0;
+	msg.msg_flags = 0;
+
+	/* send the packet with the don't fragment bit set if we currently
+	 * think it's small enough */
+	if (skb->len - sizeof(struct rxrpc_header) < trans->peer->maxdata) {
+		down_read(&trans->local->defrag_sem);
+		/* send the packet by UDP
+		 * - returns -EMSGSIZE if UDP would have to fragment the packet
+		 *   to go out of the interface
+		 *   - in which case, we'll have processed the ICMP error
+		 *     message and update the peer record
+		 */
+		ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1,
+				     iov[0].iov_len);
+
+		up_read(&trans->local->defrag_sem);
+		if (ret == -EMSGSIZE)
+			goto send_fragmentable;
+
+		_leave(" = %d [%u]", ret, trans->peer->maxdata);
+		return ret;
+	}
+
+send_fragmentable:
+	/* attempt to send this message with fragmentation enabled */
+	_debug("send fragment");
+
+	down_write(&trans->local->defrag_sem);
+	opt = IP_PMTUDISC_DONT;
+	ret = kernel_setsockopt(trans->local->socket, SOL_IP, IP_MTU_DISCOVER,
+				(char *) &opt, sizeof(opt));
+	if (ret == 0) {
+		ret = kernel_sendmsg(trans->local->socket, &msg, iov, 1,
+				     iov[0].iov_len);
+
+		opt = IP_PMTUDISC_DO;
+		kernel_setsockopt(trans->local->socket, SOL_IP,
+				  IP_MTU_DISCOVER, (char *) &opt, sizeof(opt));
+	}
+
+	up_write(&trans->local->defrag_sem);
+	_leave(" = %d [frag %u]", ret, trans->peer->maxdata);
+	return ret;
+}
+
+/*
+ * wait for space to appear in the transmit/ACK window
+ * - caller holds the socket locked
+ */
+static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
+				    struct rxrpc_call *call,
+				    long *timeo)
+{
+	DECLARE_WAITQUEUE(myself, current);
+	int ret;
+
+	_enter(",{%d},%ld",
+	       CIRC_SPACE(call->acks_head, call->acks_tail, call->acks_winsz),
+	       *timeo);
+
+	add_wait_queue(&call->tx_waitq, &myself);
+
+	for (;;) {
+		set_current_state(TASK_INTERRUPTIBLE);
+		ret = 0;
+		if (CIRC_SPACE(call->acks_head, call->acks_tail,
+			       call->acks_winsz) > 0)
+			break;
+		if (signal_pending(current)) {
+			ret = sock_intr_errno(*timeo);
+			break;
+		}
+
+		release_sock(&rx->sk);
+		*timeo = schedule_timeout(*timeo);
+		lock_sock(&rx->sk);
+	}
+
+	remove_wait_queue(&call->tx_waitq, &myself);
+	set_current_state(TASK_RUNNING);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * attempt to schedule an instant Tx resend
+ */
+static inline void rxrpc_instant_resend(struct rxrpc_call *call)
+{
+	read_lock_bh(&call->state_lock);
+	if (try_to_del_timer_sync(&call->resend_timer) >= 0) {
+		clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
+		if (call->state < RXRPC_CALL_COMPLETE &&
+		    !test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events))
+			schedule_work(&call->processor);
+	}
+	read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * queue a packet for transmission, set the resend timer and attempt
+ * to send the packet immediately
+ */
+static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb,
+			       bool last)
+{
+	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+	int ret;
+
+	_net("queue skb %p [%d]", skb, call->acks_head);
+
+	ASSERT(call->acks_window != NULL);
+	call->acks_window[call->acks_head] = (unsigned long) skb;
+	smp_wmb();
+	call->acks_head = (call->acks_head + 1) & (call->acks_winsz - 1);
+
+	if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
+		_debug("________awaiting reply/ACK__________");
+		write_lock_bh(&call->state_lock);
+		switch (call->state) {
+		case RXRPC_CALL_CLIENT_SEND_REQUEST:
+			call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
+			break;
+		case RXRPC_CALL_SERVER_ACK_REQUEST:
+			call->state = RXRPC_CALL_SERVER_SEND_REPLY;
+			if (!last)
+				break;
+		case RXRPC_CALL_SERVER_SEND_REPLY:
+			call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
+			break;
+		default:
+			break;
+		}
+		write_unlock_bh(&call->state_lock);
+	}
+
+	_proto("Tx DATA %%%u { #%u }",
+	       ntohl(sp->hdr.serial), ntohl(sp->hdr.seq));
+
+	sp->need_resend = 0;
+	sp->resend_at = jiffies + rxrpc_resend_timeout * HZ;
+	if (!test_and_set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags)) {
+		_debug("run timer");
+		call->resend_timer.expires = sp->resend_at;
+		add_timer(&call->resend_timer);
+	}
+
+	/* attempt to cancel the rx-ACK timer, deferring reply transmission if
+	 * we're ACK'ing the request phase of an incoming call */
+	ret = -EAGAIN;
+	if (try_to_del_timer_sync(&call->ack_timer) >= 0) {
+		/* the packet may be freed by rxrpc_process_call() before this
+		 * returns */
+		ret = rxrpc_send_packet(call->conn->trans, skb);
+		_net("sent skb %p", skb);
+	} else {
+		_debug("failed to delete ACK timer");
+	}
+
+	if (ret < 0) {
+		_debug("need instant resend %d", ret);
+		sp->need_resend = 1;
+		rxrpc_instant_resend(call);
+	}
+
+	_leave("");
+}
+
+/*
+ * send data through a socket
+ * - must be called in process context
+ * - caller holds the socket locked
+ */
+static int rxrpc_send_data(struct kiocb *iocb,
+			   struct rxrpc_sock *rx,
+			   struct rxrpc_call *call,
+			   struct msghdr *msg, size_t len)
+{
+	struct rxrpc_skb_priv *sp;
+	unsigned char __user *from;
+	struct sk_buff *skb;
+	struct iovec *iov;
+	struct sock *sk = &rx->sk;
+	long timeo;
+	bool more;
+	int ret, ioc, segment, copied;
+
+	_enter(",,,{%zu},%zu", msg->msg_iovlen, len);
+
+	timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
+
+	/* this should be in poll */
+	clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+
+	if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
+		return -EPIPE;
+
+	iov = msg->msg_iov;
+	ioc = msg->msg_iovlen - 1;
+	from = iov->iov_base;
+	segment = iov->iov_len;
+	iov++;
+	more = msg->msg_flags & MSG_MORE;
+
+	skb = call->tx_pending;
+	call->tx_pending = NULL;
+
+	copied = 0;
+	do {
+		int copy;
+
+		if (segment > len)
+			segment = len;
+
+		_debug("SEGMENT %d @%p", segment, from);
+
+		if (!skb) {
+			size_t size, chunk, max, space;
+
+			_debug("alloc");
+
+			if (CIRC_SPACE(call->acks_head, call->acks_tail,
+				       call->acks_winsz) <= 0) {
+				ret = -EAGAIN;
+				if (msg->msg_flags & MSG_DONTWAIT)
+					goto maybe_error;
+				ret = rxrpc_wait_for_tx_window(rx, call,
+							       &timeo);
+				if (ret < 0)
+					goto maybe_error;
+			}
+
+			max = call->conn->trans->peer->maxdata;
+			max -= call->conn->security_size;
+			max &= ~(call->conn->size_align - 1UL);
+
+			chunk = max;
+			if (chunk > len)
+				chunk = len;
+
+			space = chunk + call->conn->size_align;
+			space &= ~(call->conn->size_align - 1UL);
+
+			size = space + call->conn->header_size;
+
+			_debug("SIZE: %zu/%zu/%zu", chunk, space, size);
+
+			/* create a buffer that we can retain until it's ACK'd */
+			skb = sock_alloc_send_skb(
+				sk, size, msg->msg_flags & MSG_DONTWAIT, &ret);
+			if (!skb)
+				goto maybe_error;
+
+			rxrpc_new_skb(skb);
+
+			_debug("ALLOC SEND %p", skb);
+
+			ASSERTCMP(skb->mark, ==, 0);
+
+			_debug("HS: %u", call->conn->header_size);
+			skb_reserve(skb, call->conn->header_size);
+			skb->len += call->conn->header_size;
+
+			sp = rxrpc_skb(skb);
+			sp->remain = chunk;
+			if (sp->remain > skb_tailroom(skb))
+				sp->remain = skb_tailroom(skb);
+
+			_net("skb: hr %d, tr %d, hl %d, rm %d",
+			       skb_headroom(skb),
+			       skb_tailroom(skb),
+			       skb_headlen(skb),
+			       sp->remain);
+
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+		}
+
+		_debug("append");
+		sp = rxrpc_skb(skb);
+
+		/* append next segment of data to the current buffer */
+		copy = skb_tailroom(skb);
+		ASSERTCMP(copy, >, 0);
+		if (copy > segment)
+			copy = segment;
+		if (copy > sp->remain)
+			copy = sp->remain;
+
+		_debug("add");
+		ret = skb_add_data(skb, from, copy);
+		_debug("added");
+		if (ret < 0)
+			goto efault;
+		sp->remain -= copy;
+		skb->mark += copy;
+
+		len -= copy;
+		segment -= copy;
+		from += copy;
+		while (segment == 0 && ioc > 0) {
+			from = iov->iov_base;
+			segment = iov->iov_len;
+			iov++;
+			ioc--;
+		}
+		if (len == 0) {
+			segment = 0;
+			ioc = 0;
+		}
+
+		/* check for the far side aborting the call or a network error
+		 * occurring */
+		if (call->state > RXRPC_CALL_COMPLETE)
+			goto call_aborted;
+
+		/* add the packet to the send queue if it's now full */
+		if (sp->remain <= 0 || (segment == 0 && !more)) {
+			struct rxrpc_connection *conn = call->conn;
+			size_t pad;
+
+			/* pad out if we're using security */
+			if (conn->security) {
+				pad = conn->security_size + skb->mark;
+				pad = conn->size_align - pad;
+				pad &= conn->size_align - 1;
+				_debug("pad %zu", pad);
+				if (pad)
+					memset(skb_put(skb, pad), 0, pad);
+			}
+
+			sp->hdr.epoch = conn->epoch;
+			sp->hdr.cid = call->cid;
+			sp->hdr.callNumber = call->call_id;
+			sp->hdr.seq =
+				htonl(atomic_inc_return(&call->sequence));
+			sp->hdr.serial =
+				htonl(atomic_inc_return(&conn->serial));
+			sp->hdr.type = RXRPC_PACKET_TYPE_DATA;
+			sp->hdr.userStatus = 0;
+			sp->hdr.securityIndex = conn->security_ix;
+			sp->hdr._rsvd = 0;
+			sp->hdr.serviceId = conn->service_id;
+
+			sp->hdr.flags = conn->out_clientflag;
+			if (len == 0 && !more)
+				sp->hdr.flags |= RXRPC_LAST_PACKET;
+			else if (CIRC_SPACE(call->acks_head, call->acks_tail,
+					    call->acks_winsz) > 1)
+				sp->hdr.flags |= RXRPC_MORE_PACKETS;
+
+			ret = rxrpc_secure_packet(
+				call, skb, skb->mark,
+				skb->head + sizeof(struct rxrpc_header));
+			if (ret < 0)
+				goto out;
+
+			memcpy(skb->head, &sp->hdr,
+			       sizeof(struct rxrpc_header));
+			rxrpc_queue_packet(call, skb, segment == 0 && !more);
+			skb = NULL;
+		}
+
+	} while (segment > 0);
+
+out:
+	call->tx_pending = skb;
+	_leave(" = %d", ret);
+	return ret;
+
+call_aborted:
+	rxrpc_free_skb(skb);
+	if (call->state == RXRPC_CALL_NETWORK_ERROR)
+		ret = call->conn->trans->peer->net_error;
+	else
+		ret = -ECONNABORTED;
+	_leave(" = %d", ret);
+	return ret;
+
+maybe_error:
+	if (copied)
+		ret = copied;
+	goto out;
+
+efault:
+	ret = -EFAULT;
+	goto out;
+}
diff --git a/net/rxrpc/ar-peer.c b/net/rxrpc/ar-peer.c
new file mode 100644
index 0000000..69ac355
--- /dev/null
+++ b/net/rxrpc/ar-peer.c
@@ -0,0 +1,273 @@
+/* RxRPC remote transport endpoint management
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+static LIST_HEAD(rxrpc_peers);
+static DEFINE_RWLOCK(rxrpc_peer_lock);
+static DECLARE_WAIT_QUEUE_HEAD(rxrpc_peer_wq);
+
+static void rxrpc_destroy_peer(struct work_struct *work);
+
+/*
+ * allocate a new peer
+ */
+static struct rxrpc_peer *rxrpc_alloc_peer(struct sockaddr_rxrpc *srx,
+					   gfp_t gfp)
+{
+	struct rxrpc_peer *peer;
+
+	_enter("");
+
+	peer = kzalloc(sizeof(struct rxrpc_peer), gfp);
+	if (peer) {
+		INIT_WORK(&peer->destroyer, &rxrpc_destroy_peer);
+		INIT_LIST_HEAD(&peer->link);
+		INIT_LIST_HEAD(&peer->error_targets);
+		spin_lock_init(&peer->lock);
+		atomic_set(&peer->usage, 1);
+		peer->debug_id = atomic_inc_return(&rxrpc_debug_id);
+		memcpy(&peer->srx, srx, sizeof(*srx));
+
+		peer->mtu = peer->if_mtu = 65535;
+
+		if (srx->transport.family == AF_INET) {
+			peer->hdrsize = sizeof(struct iphdr);
+			switch (srx->transport_type) {
+			case SOCK_DGRAM:
+				peer->hdrsize += sizeof(struct udphdr);
+				break;
+			default:
+				BUG();
+				break;
+			}
+		} else {
+			BUG();
+		}
+
+		peer->hdrsize += sizeof(struct rxrpc_header);
+		peer->maxdata = peer->mtu - peer->hdrsize;
+	}
+
+	_leave(" = %p", peer);
+	return peer;
+}
+
+/*
+ * obtain a remote transport endpoint for the specified address
+ */
+struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *srx, gfp_t gfp)
+{
+	struct rxrpc_peer *peer, *candidate;
+	const char *new = "old";
+	int usage;
+
+	_enter("{%d,%d,%u.%u.%u.%u+%hu}",
+	       srx->transport_type,
+	       srx->transport_len,
+	       NIPQUAD(srx->transport.sin.sin_addr),
+	       ntohs(srx->transport.sin.sin_port));
+
+	/* search the peer list first */
+	read_lock_bh(&rxrpc_peer_lock);
+	list_for_each_entry(peer, &rxrpc_peers, link) {
+		_debug("check PEER %d { u=%d t=%d l=%d }",
+		       peer->debug_id,
+		       atomic_read(&peer->usage),
+		       peer->srx.transport_type,
+		       peer->srx.transport_len);
+
+		if (atomic_read(&peer->usage) > 0 &&
+		    peer->srx.transport_type == srx->transport_type &&
+		    peer->srx.transport_len == srx->transport_len &&
+		    memcmp(&peer->srx.transport,
+			   &srx->transport,
+			   srx->transport_len) == 0)
+			goto found_extant_peer;
+	}
+	read_unlock_bh(&rxrpc_peer_lock);
+
+	/* not yet present - create a candidate for a new record and then
+	 * redo the search */
+	candidate = rxrpc_alloc_peer(srx, gfp);
+	if (!candidate) {
+		_leave(" = -ENOMEM");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	write_lock_bh(&rxrpc_peer_lock);
+
+	list_for_each_entry(peer, &rxrpc_peers, link) {
+		if (atomic_read(&peer->usage) > 0 &&
+		    peer->srx.transport_type == srx->transport_type &&
+		    peer->srx.transport_len == srx->transport_len &&
+		    memcmp(&peer->srx.transport,
+			   &srx->transport,
+			   srx->transport_len) == 0)
+			goto found_extant_second;
+	}
+
+	/* we can now add the new candidate to the list */
+	peer = candidate;
+	candidate = NULL;
+
+	list_add_tail(&peer->link, &rxrpc_peers);
+	write_unlock_bh(&rxrpc_peer_lock);
+	new = "new";
+
+success:
+	_net("PEER %s %d {%d,%u,%u.%u.%u.%u+%hu}",
+	     new,
+	     peer->debug_id,
+	     peer->srx.transport_type,
+	     peer->srx.transport.family,
+	     NIPQUAD(peer->srx.transport.sin.sin_addr),
+	     ntohs(peer->srx.transport.sin.sin_port));
+
+	_leave(" = %p {u=%d}", peer, atomic_read(&peer->usage));
+	return peer;
+
+	/* we found the peer in the list immediately */
+found_extant_peer:
+	usage = atomic_inc_return(&peer->usage);
+	read_unlock_bh(&rxrpc_peer_lock);
+	goto success;
+
+	/* we found the peer on the second time through the list */
+found_extant_second:
+	usage = atomic_inc_return(&peer->usage);
+	write_unlock_bh(&rxrpc_peer_lock);
+	kfree(candidate);
+	goto success;
+}
+
+/*
+ * find the peer associated with a packet
+ */
+struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *local,
+				   __be32 addr, __be16 port)
+{
+	struct rxrpc_peer *peer;
+
+	_enter("");
+
+	/* search the peer list */
+	read_lock_bh(&rxrpc_peer_lock);
+
+	if (local->srx.transport.family == AF_INET &&
+	    local->srx.transport_type == SOCK_DGRAM
+	    ) {
+		list_for_each_entry(peer, &rxrpc_peers, link) {
+			if (atomic_read(&peer->usage) > 0 &&
+			    peer->srx.transport_type == SOCK_DGRAM &&
+			    peer->srx.transport.family == AF_INET &&
+			    peer->srx.transport.sin.sin_port == port &&
+			    peer->srx.transport.sin.sin_addr.s_addr == addr)
+				goto found_UDP_peer;
+		}
+
+		goto new_UDP_peer;
+	}
+
+	read_unlock_bh(&rxrpc_peer_lock);
+	_leave(" = -EAFNOSUPPORT");
+	return ERR_PTR(-EAFNOSUPPORT);
+
+found_UDP_peer:
+	_net("Rx UDP DGRAM from peer %d", peer->debug_id);
+	atomic_inc(&peer->usage);
+	read_unlock_bh(&rxrpc_peer_lock);
+	_leave(" = %p", peer);
+	return peer;
+
+new_UDP_peer:
+	_net("Rx UDP DGRAM from NEW peer %d", peer->debug_id);
+	read_unlock_bh(&rxrpc_peer_lock);
+	_leave(" = -EBUSY [new]");
+	return ERR_PTR(-EBUSY);
+}
+
+/*
+ * release a remote transport endpoint
+ */
+void rxrpc_put_peer(struct rxrpc_peer *peer)
+{
+	_enter("%p{u=%d}", peer, atomic_read(&peer->usage));
+
+	ASSERTCMP(atomic_read(&peer->usage), >, 0);
+
+	if (likely(!atomic_dec_and_test(&peer->usage))) {
+		_leave(" [in use]");
+		return;
+	}
+
+	schedule_work(&peer->destroyer);
+	_leave("");
+}
+
+/*
+ * destroy a remote transport endpoint
+ */
+static void rxrpc_destroy_peer(struct work_struct *work)
+{
+	struct rxrpc_peer *peer =
+		container_of(work, struct rxrpc_peer, destroyer);
+
+	_enter("%p{%d}", peer, atomic_read(&peer->usage));
+
+	write_lock_bh(&rxrpc_peer_lock);
+	list_del(&peer->link);
+	write_unlock_bh(&rxrpc_peer_lock);
+
+	_net("DESTROY PEER %d", peer->debug_id);
+	kfree(peer);
+
+	if (list_empty(&rxrpc_peers))
+		wake_up_all(&rxrpc_peer_wq);
+	_leave("");
+}
+
+/*
+ * preemptively destroy all the peer records from a transport endpoint rather
+ * than waiting for them to time out
+ */
+void __exit rxrpc_destroy_all_peers(void)
+{
+	DECLARE_WAITQUEUE(myself,current);
+
+	_enter("");
+
+	/* we simply have to wait for them to go away */
+	if (!list_empty(&rxrpc_peers)) {
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		add_wait_queue(&rxrpc_peer_wq, &myself);
+
+		while (!list_empty(&rxrpc_peers)) {
+			schedule();
+			set_current_state(TASK_UNINTERRUPTIBLE);
+		}
+
+		remove_wait_queue(&rxrpc_peer_wq, &myself);
+		set_current_state(TASK_RUNNING);
+	}
+
+	_leave("");
+}
diff --git a/net/rxrpc/ar-proc.c b/net/rxrpc/ar-proc.c
new file mode 100644
index 0000000..58f4b4e
--- /dev/null
+++ b/net/rxrpc/ar-proc.c
@@ -0,0 +1,247 @@
+/* /proc/net/ support for AF_RXRPC
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+static const char *rxrpc_conn_states[] = {
+	[RXRPC_CONN_UNUSED]		= "Unused  ",
+	[RXRPC_CONN_CLIENT]		= "Client  ",
+	[RXRPC_CONN_SERVER_UNSECURED]	= "SvUnsec ",
+	[RXRPC_CONN_SERVER_CHALLENGING]	= "SvChall ",
+	[RXRPC_CONN_SERVER]		= "SvSecure",
+	[RXRPC_CONN_REMOTELY_ABORTED]	= "RmtAbort",
+	[RXRPC_CONN_LOCALLY_ABORTED]	= "LocAbort",
+	[RXRPC_CONN_NETWORK_ERROR]	= "NetError",
+};
+
+const char *rxrpc_call_states[] = {
+	[RXRPC_CALL_CLIENT_SEND_REQUEST]	= "ClSndReq",
+	[RXRPC_CALL_CLIENT_AWAIT_REPLY]		= "ClAwtRpl",
+	[RXRPC_CALL_CLIENT_RECV_REPLY]		= "ClRcvRpl",
+	[RXRPC_CALL_CLIENT_FINAL_ACK]		= "ClFnlACK",
+	[RXRPC_CALL_SERVER_SECURING]		= "SvSecure",
+	[RXRPC_CALL_SERVER_ACCEPTING]		= "SvAccept",
+	[RXRPC_CALL_SERVER_RECV_REQUEST]	= "SvRcvReq",
+	[RXRPC_CALL_SERVER_ACK_REQUEST]		= "SvAckReq",
+	[RXRPC_CALL_SERVER_SEND_REPLY]		= "SvSndRpl",
+	[RXRPC_CALL_SERVER_AWAIT_ACK]		= "SvAwtACK",
+	[RXRPC_CALL_COMPLETE]			= "Complete",
+	[RXRPC_CALL_SERVER_BUSY]		= "SvBusy  ",
+	[RXRPC_CALL_REMOTELY_ABORTED]		= "RmtAbort",
+	[RXRPC_CALL_LOCALLY_ABORTED]		= "LocAbort",
+	[RXRPC_CALL_NETWORK_ERROR]		= "NetError",
+	[RXRPC_CALL_DEAD]			= "Dead    ",
+};
+
+/*
+ * generate a list of extant and dead calls in /proc/net/rxrpc_calls
+ */
+static void *rxrpc_call_seq_start(struct seq_file *seq, loff_t *_pos)
+{
+	struct list_head *_p;
+	loff_t pos = *_pos;
+
+	read_lock(&rxrpc_call_lock);
+	if (!pos)
+		return SEQ_START_TOKEN;
+	pos--;
+
+	list_for_each(_p, &rxrpc_calls)
+		if (!pos--)
+			break;
+
+	return _p != &rxrpc_calls ? _p : NULL;
+}
+
+static void *rxrpc_call_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct list_head *_p;
+
+	(*pos)++;
+
+	_p = v;
+	_p = (v == SEQ_START_TOKEN) ? rxrpc_calls.next : _p->next;
+
+	return _p != &rxrpc_calls ? _p : NULL;
+}
+
+static void rxrpc_call_seq_stop(struct seq_file *seq, void *v)
+{
+	read_unlock(&rxrpc_call_lock);
+}
+
+static int rxrpc_call_seq_show(struct seq_file *seq, void *v)
+{
+	struct rxrpc_transport *trans;
+	struct rxrpc_call *call;
+	char lbuff[4 + 4 + 4 + 4 + 5 + 1], rbuff[4 + 4 + 4 + 4 + 5 + 1];
+
+	if (v == SEQ_START_TOKEN) {
+		seq_puts(seq,
+			 "Proto Local                  Remote                "
+			 " SvID ConnID   CallID   End Use State    Abort   "
+			 " UserID\n");
+		return 0;
+	}
+
+	call = list_entry(v, struct rxrpc_call, link);
+	trans = call->conn->trans;
+
+	sprintf(lbuff, NIPQUAD_FMT":%u",
+		NIPQUAD(trans->local->srx.transport.sin.sin_addr),
+		ntohs(trans->local->srx.transport.sin.sin_port));
+
+	sprintf(rbuff, NIPQUAD_FMT":%u",
+		NIPQUAD(trans->peer->srx.transport.sin.sin_addr),
+		ntohs(trans->peer->srx.transport.sin.sin_port));
+
+	seq_printf(seq,
+		   "UDP   %-22.22s %-22.22s %4x %08x %08x %s %3u"
+		   " %-8.8s %08x %lx\n",
+		   lbuff,
+		   rbuff,
+		   ntohs(call->conn->service_id),
+		   ntohl(call->conn->cid),
+		   ntohl(call->call_id),
+		   call->conn->in_clientflag ? "Svc" : "Clt",
+		   atomic_read(&call->usage),
+		   rxrpc_call_states[call->state],
+		   call->abort_code,
+		   call->user_call_ID);
+
+	return 0;
+}
+
+static struct seq_operations rxrpc_call_seq_ops = {
+	.start  = rxrpc_call_seq_start,
+	.next   = rxrpc_call_seq_next,
+	.stop   = rxrpc_call_seq_stop,
+	.show   = rxrpc_call_seq_show,
+};
+
+static int rxrpc_call_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &rxrpc_call_seq_ops);
+}
+
+struct file_operations rxrpc_call_seq_fops = {
+	.owner		= THIS_MODULE,
+	.open		= rxrpc_call_seq_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release_private,
+};
+
+/*
+ * generate a list of extant virtual connections in /proc/net/rxrpc_conns
+ */
+static void *rxrpc_connection_seq_start(struct seq_file *seq, loff_t *_pos)
+{
+	struct list_head *_p;
+	loff_t pos = *_pos;
+
+	read_lock(&rxrpc_connection_lock);
+	if (!pos)
+		return SEQ_START_TOKEN;
+	pos--;
+
+	list_for_each(_p, &rxrpc_connections)
+		if (!pos--)
+			break;
+
+	return _p != &rxrpc_connections ? _p : NULL;
+}
+
+static void *rxrpc_connection_seq_next(struct seq_file *seq, void *v,
+				       loff_t *pos)
+{
+	struct list_head *_p;
+
+	(*pos)++;
+
+	_p = v;
+	_p = (v == SEQ_START_TOKEN) ? rxrpc_connections.next : _p->next;
+
+	return _p != &rxrpc_connections ? _p : NULL;
+}
+
+static void rxrpc_connection_seq_stop(struct seq_file *seq, void *v)
+{
+	read_unlock(&rxrpc_connection_lock);
+}
+
+static int rxrpc_connection_seq_show(struct seq_file *seq, void *v)
+{
+	struct rxrpc_connection *conn;
+	struct rxrpc_transport *trans;
+	char lbuff[4 + 4 + 4 + 4 + 5 + 1], rbuff[4 + 4 + 4 + 4 + 5 + 1];
+
+	if (v == SEQ_START_TOKEN) {
+		seq_puts(seq,
+			 "Proto Local                  Remote                "
+			 " SvID ConnID   Calls    End Use State    Key     "
+			 " Serial   ISerial\n"
+			 );
+		return 0;
+	}
+
+	conn = list_entry(v, struct rxrpc_connection, link);
+	trans = conn->trans;
+
+	sprintf(lbuff, NIPQUAD_FMT":%u",
+		NIPQUAD(trans->local->srx.transport.sin.sin_addr),
+		ntohs(trans->local->srx.transport.sin.sin_port));
+
+	sprintf(rbuff, NIPQUAD_FMT":%u",
+		NIPQUAD(trans->peer->srx.transport.sin.sin_addr),
+		ntohs(trans->peer->srx.transport.sin.sin_port));
+
+	seq_printf(seq,
+		   "UDP   %-22.22s %-22.22s %4x %08x %08x %s %3u"
+		   " %s %08x %08x %08x\n",
+		   lbuff,
+		   rbuff,
+		   ntohs(conn->service_id),
+		   ntohl(conn->cid),
+		   conn->call_counter,
+		   conn->in_clientflag ? "Svc" : "Clt",
+		   atomic_read(&conn->usage),
+		   rxrpc_conn_states[conn->state],
+		   key_serial(conn->key),
+		   atomic_read(&conn->serial),
+		   atomic_read(&conn->hi_serial));
+
+	return 0;
+}
+
+static struct seq_operations rxrpc_connection_seq_ops = {
+	.start  = rxrpc_connection_seq_start,
+	.next   = rxrpc_connection_seq_next,
+	.stop   = rxrpc_connection_seq_stop,
+	.show   = rxrpc_connection_seq_show,
+};
+
+
+static int rxrpc_connection_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &rxrpc_connection_seq_ops);
+}
+
+struct file_operations rxrpc_connection_seq_fops = {
+	.owner		= THIS_MODULE,
+	.open		= rxrpc_connection_seq_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release_private,
+};
diff --git a/net/rxrpc/ar-recvmsg.c b/net/rxrpc/ar-recvmsg.c
new file mode 100644
index 0000000..e947d5c
--- /dev/null
+++ b/net/rxrpc/ar-recvmsg.c
@@ -0,0 +1,366 @@
+/* RxRPC recvmsg() implementation
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+/*
+ * removal a call's user ID from the socket tree to make the user ID available
+ * again and so that it won't be seen again in association with that call
+ */
+static void rxrpc_remove_user_ID(struct rxrpc_sock *rx, struct rxrpc_call *call)
+{
+	_debug("RELEASE CALL %d", call->debug_id);
+
+	if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
+		write_lock_bh(&rx->call_lock);
+		rb_erase(&call->sock_node, &call->socket->calls);
+		clear_bit(RXRPC_CALL_HAS_USERID, &call->flags);
+		write_unlock_bh(&rx->call_lock);
+	}
+
+	read_lock_bh(&call->state_lock);
+	if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) &&
+	    !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
+		schedule_work(&call->processor);
+	read_unlock_bh(&call->state_lock);
+}
+
+/*
+ * receive a message from an RxRPC socket
+ * - we need to be careful about two or more threads calling recvmsg
+ *   simultaneously
+ */
+int rxrpc_recvmsg(struct kiocb *iocb, struct socket *sock,
+		  struct msghdr *msg, size_t len, int flags)
+{
+	struct rxrpc_skb_priv *sp;
+	struct rxrpc_call *call = NULL, *continue_call = NULL;
+	struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
+	struct sk_buff *skb;
+	long timeo;
+	int copy, ret, ullen, offset, copied = 0;
+	u32 abort_code;
+
+	DEFINE_WAIT(wait);
+
+	_enter(",,,%zu,%d", len, flags);
+
+	if (flags & (MSG_OOB | MSG_TRUNC))
+		return -EOPNOTSUPP;
+
+	ullen = msg->msg_flags & MSG_CMSG_COMPAT ? 4 : sizeof(unsigned long);
+
+	timeo = sock_rcvtimeo(&rx->sk, flags & MSG_DONTWAIT);
+	msg->msg_flags |= MSG_MORE;
+
+	lock_sock(&rx->sk);
+
+	for (;;) {
+		/* return immediately if a client socket has no outstanding
+		 * calls */
+		if (RB_EMPTY_ROOT(&rx->calls)) {
+			if (copied)
+				goto out;
+			if (rx->sk.sk_state != RXRPC_SERVER_LISTENING) {
+				release_sock(&rx->sk);
+				if (continue_call)
+					rxrpc_put_call(continue_call);
+				return -ENODATA;
+			}
+		}
+
+		/* get the next message on the Rx queue */
+		skb = skb_peek(&rx->sk.sk_receive_queue);
+		if (!skb) {
+			/* nothing remains on the queue */
+			if (copied &&
+			    (msg->msg_flags & MSG_PEEK || timeo == 0))
+				goto out;
+
+			/* wait for a message to turn up */
+			release_sock(&rx->sk);
+			prepare_to_wait_exclusive(rx->sk.sk_sleep, &wait,
+						  TASK_INTERRUPTIBLE);
+			ret = sock_error(&rx->sk);
+			if (ret)
+				goto wait_error;
+
+			if (skb_queue_empty(&rx->sk.sk_receive_queue)) {
+				if (signal_pending(current))
+					goto wait_interrupted;
+				timeo = schedule_timeout(timeo);
+			}
+			finish_wait(rx->sk.sk_sleep, &wait);
+			lock_sock(&rx->sk);
+			continue;
+		}
+
+	peek_next_packet:
+		sp = rxrpc_skb(skb);
+		call = sp->call;
+		ASSERT(call != NULL);
+
+		_debug("next pkt %s", rxrpc_pkts[sp->hdr.type]);
+
+		/* make sure we wait for the state to be updated in this call */
+		spin_lock_bh(&call->lock);
+		spin_unlock_bh(&call->lock);
+
+		if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) {
+			_debug("packet from released call");
+			if (skb_dequeue(&rx->sk.sk_receive_queue) != skb)
+				BUG();
+			rxrpc_free_skb(skb);
+			continue;
+		}
+
+		/* determine whether to continue last data receive */
+		if (continue_call) {
+			_debug("maybe cont");
+			if (call != continue_call ||
+			    skb->mark != RXRPC_SKB_MARK_DATA) {
+				release_sock(&rx->sk);
+				rxrpc_put_call(continue_call);
+				_leave(" = %d [noncont]", copied);
+				return copied;
+			}
+		}
+
+		rxrpc_get_call(call);
+
+		/* copy the peer address and timestamp */
+		if (!continue_call) {
+			if (msg->msg_name && msg->msg_namelen > 0)
+				memcpy(&msg->msg_name, &call->conn->trans->peer->srx,
+				       sizeof(call->conn->trans->peer->srx));
+			sock_recv_timestamp(msg, &rx->sk, skb);
+		}
+
+		/* receive the message */
+		if (skb->mark != RXRPC_SKB_MARK_DATA)
+			goto receive_non_data_message;
+
+		_debug("recvmsg DATA #%u { %d, %d }",
+		       ntohl(sp->hdr.seq), skb->len, sp->offset);
+
+		if (!continue_call) {
+			/* only set the control data once per recvmsg() */
+			ret = put_cmsg(msg, SOL_RXRPC, RXRPC_USER_CALL_ID,
+				       ullen, &call->user_call_ID);
+			if (ret < 0)
+				goto copy_error;
+			ASSERT(test_bit(RXRPC_CALL_HAS_USERID, &call->flags));
+		}
+
+		ASSERTCMP(ntohl(sp->hdr.seq), >=, call->rx_data_recv);
+		ASSERTCMP(ntohl(sp->hdr.seq), <=, call->rx_data_recv + 1);
+		call->rx_data_recv = ntohl(sp->hdr.seq);
+
+		ASSERTCMP(ntohl(sp->hdr.seq), >, call->rx_data_eaten);
+
+		offset = sp->offset;
+		copy = skb->len - offset;
+		if (copy > len - copied)
+			copy = len - copied;
+
+		if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
+			ret = skb_copy_datagram_iovec(skb, offset,
+						      msg->msg_iov, copy);
+		} else {
+			ret = skb_copy_and_csum_datagram_iovec(skb, offset,
+							       msg->msg_iov);
+			if (ret == -EINVAL)
+				goto csum_copy_error;
+		}
+
+		if (ret < 0)
+			goto copy_error;
+
+		/* handle piecemeal consumption of data packets */
+		_debug("copied %d+%d", copy, copied);
+
+		offset += copy;
+		copied += copy;
+
+		if (!(flags & MSG_PEEK))
+			sp->offset = offset;
+
+		if (sp->offset < skb->len) {
+			_debug("buffer full");
+			ASSERTCMP(copied, ==, len);
+			break;
+		}
+
+		/* we transferred the whole data packet */
+		if (sp->hdr.flags & RXRPC_LAST_PACKET) {
+			_debug("last");
+			if (call->conn->out_clientflag) {
+				 /* last byte of reply received */
+				ret = copied;
+				goto terminal_message;
+			}
+
+			/* last bit of request received */
+			if (!(flags & MSG_PEEK)) {
+				_debug("eat packet");
+				if (skb_dequeue(&rx->sk.sk_receive_queue) !=
+				    skb)
+					BUG();
+				rxrpc_free_skb(skb);
+			}
+			msg->msg_flags &= ~MSG_MORE;
+			break;
+		}
+
+		/* move on to the next data message */
+		_debug("next");
+		if (!continue_call)
+			continue_call = sp->call;
+		else
+			rxrpc_put_call(call);
+		call = NULL;
+
+		if (flags & MSG_PEEK) {
+			_debug("peek next");
+			skb = skb->next;
+			if (skb == (struct sk_buff *) &rx->sk.sk_receive_queue)
+				break;
+			goto peek_next_packet;
+		}
+
+		_debug("eat packet");
+		if (skb_dequeue(&rx->sk.sk_receive_queue) != skb)
+			BUG();
+		rxrpc_free_skb(skb);
+	}
+
+	/* end of non-terminal data packet reception for the moment */
+	_debug("end rcv data");
+out:
+	release_sock(&rx->sk);
+	if (call)
+		rxrpc_put_call(call);
+	if (continue_call)
+		rxrpc_put_call(continue_call);
+	_leave(" = %d [data]", copied);
+	return copied;
+
+	/* handle non-DATA messages such as aborts, incoming connections and
+	 * final ACKs */
+receive_non_data_message:
+	_debug("non-data");
+
+	if (skb->mark == RXRPC_SKB_MARK_NEW_CALL) {
+		_debug("RECV NEW CALL");
+		ret = put_cmsg(msg, SOL_RXRPC, RXRPC_NEW_CALL, 0, &abort_code);
+		if (ret < 0)
+			goto copy_error;
+		if (!(flags & MSG_PEEK)) {
+			if (skb_dequeue(&rx->sk.sk_receive_queue) != skb)
+				BUG();
+			rxrpc_free_skb(skb);
+		}
+		goto out;
+	}
+
+	ret = put_cmsg(msg, SOL_RXRPC, RXRPC_USER_CALL_ID,
+		       ullen, &call->user_call_ID);
+	if (ret < 0)
+		goto copy_error;
+	ASSERT(test_bit(RXRPC_CALL_HAS_USERID, &call->flags));
+
+	switch (skb->mark) {
+	case RXRPC_SKB_MARK_DATA:
+		BUG();
+	case RXRPC_SKB_MARK_FINAL_ACK:
+		ret = put_cmsg(msg, SOL_RXRPC, RXRPC_ACK, 0, &abort_code);
+		break;
+	case RXRPC_SKB_MARK_BUSY:
+		ret = put_cmsg(msg, SOL_RXRPC, RXRPC_BUSY, 0, &abort_code);
+		break;
+	case RXRPC_SKB_MARK_REMOTE_ABORT:
+		abort_code = call->abort_code;
+		ret = put_cmsg(msg, SOL_RXRPC, RXRPC_ABORT, 4, &abort_code);
+		break;
+	case RXRPC_SKB_MARK_NET_ERROR:
+		_debug("RECV NET ERROR %d", sp->error);
+		abort_code = sp->error;
+		ret = put_cmsg(msg, SOL_RXRPC, RXRPC_NET_ERROR, 4, &abort_code);
+		break;
+	case RXRPC_SKB_MARK_LOCAL_ERROR:
+		_debug("RECV LOCAL ERROR %d", sp->error);
+		abort_code = sp->error;
+		ret = put_cmsg(msg, SOL_RXRPC, RXRPC_LOCAL_ERROR, 4,
+			       &abort_code);
+		break;
+	default:
+		BUG();
+		break;
+	}
+
+	if (ret < 0)
+		goto copy_error;
+
+terminal_message:
+	_debug("terminal");
+	msg->msg_flags &= ~MSG_MORE;
+	msg->msg_flags |= MSG_EOR;
+
+	if (!(flags & MSG_PEEK)) {
+		_net("free terminal skb %p", skb);
+		if (skb_dequeue(&rx->sk.sk_receive_queue) != skb)
+			BUG();
+		rxrpc_free_skb(skb);
+		rxrpc_remove_user_ID(rx, call);
+	}
+
+	release_sock(&rx->sk);
+	rxrpc_put_call(call);
+	if (continue_call)
+		rxrpc_put_call(continue_call);
+	_leave(" = %d", ret);
+	return ret;
+
+copy_error:
+	_debug("copy error");
+	release_sock(&rx->sk);
+	rxrpc_put_call(call);
+	if (continue_call)
+		rxrpc_put_call(continue_call);
+	_leave(" = %d", ret);
+	return ret;
+
+csum_copy_error:
+	_debug("csum error");
+	release_sock(&rx->sk);
+	if (continue_call)
+		rxrpc_put_call(continue_call);
+	rxrpc_kill_skb(skb);
+	skb_kill_datagram(&rx->sk, skb, flags);
+	rxrpc_put_call(call);
+	return -EAGAIN;
+
+wait_interrupted:
+	ret = sock_intr_errno(timeo);
+wait_error:
+	finish_wait(rx->sk.sk_sleep, &wait);
+	if (continue_call)
+		rxrpc_put_call(continue_call);
+	if (copied)
+		copied = ret;
+	_leave(" = %d [waitfail %d]", copied, ret);
+	return copied;
+
+}
diff --git a/net/rxrpc/ar-security.c b/net/rxrpc/ar-security.c
new file mode 100644
index 0000000..60d1d36
--- /dev/null
+++ b/net/rxrpc/ar-security.c
@@ -0,0 +1,258 @@
+/* RxRPC security handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/udp.h>
+#include <linux/crypto.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+static LIST_HEAD(rxrpc_security_methods);
+static DECLARE_RWSEM(rxrpc_security_sem);
+
+/*
+ * get an RxRPC security module
+ */
+static struct rxrpc_security *rxrpc_security_get(struct rxrpc_security *sec)
+{
+	return try_module_get(sec->owner) ? sec : NULL;
+}
+
+/*
+ * release an RxRPC security module
+ */
+static void rxrpc_security_put(struct rxrpc_security *sec)
+{
+	module_put(sec->owner);
+}
+
+/*
+ * look up an rxrpc security module
+ */
+struct rxrpc_security *rxrpc_security_lookup(u8 security_index)
+{
+	struct rxrpc_security *sec = NULL;
+
+	_enter("");
+
+	down_read(&rxrpc_security_sem);
+
+	list_for_each_entry(sec, &rxrpc_security_methods, link) {
+		if (sec->security_index == security_index) {
+			if (unlikely(!rxrpc_security_get(sec)))
+				break;
+			goto out;
+		}
+	}
+
+	sec = NULL;
+out:
+	up_read(&rxrpc_security_sem);
+	_leave(" = %p [%s]", sec, sec ? sec->name : "");
+	return sec;
+}
+
+/**
+ * rxrpc_register_security - register an RxRPC security handler
+ * @sec: security module
+ *
+ * register an RxRPC security handler for use by RxRPC
+ */
+int rxrpc_register_security(struct rxrpc_security *sec)
+{
+	struct rxrpc_security *psec;
+	int ret;
+
+	_enter("");
+	down_write(&rxrpc_security_sem);
+
+	ret = -EEXIST;
+	list_for_each_entry(psec, &rxrpc_security_methods, link) {
+		if (psec->security_index == sec->security_index)
+			goto out;
+	}
+
+	list_add(&sec->link, &rxrpc_security_methods);
+
+	printk(KERN_NOTICE "RxRPC: Registered security type %d '%s'\n",
+	       sec->security_index, sec->name);
+	ret = 0;
+
+out:
+	up_write(&rxrpc_security_sem);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+EXPORT_SYMBOL_GPL(rxrpc_register_security);
+
+/**
+ * rxrpc_unregister_security - unregister an RxRPC security handler
+ * @sec: security module
+ *
+ * unregister an RxRPC security handler
+ */
+void rxrpc_unregister_security(struct rxrpc_security *sec)
+{
+
+	_enter("");
+	down_write(&rxrpc_security_sem);
+	list_del_init(&sec->link);
+	up_write(&rxrpc_security_sem);
+
+	printk(KERN_NOTICE "RxRPC: Unregistered security type %d '%s'\n",
+	       sec->security_index, sec->name);
+}
+
+EXPORT_SYMBOL_GPL(rxrpc_unregister_security);
+
+/*
+ * initialise the security on a client connection
+ */
+int rxrpc_init_client_conn_security(struct rxrpc_connection *conn)
+{
+	struct rxrpc_security *sec;
+	struct key *key = conn->key;
+	int ret;
+
+	_enter("{%d},{%x}", conn->debug_id, key_serial(key));
+
+	if (!key)
+		return 0;
+
+	ret = key_validate(key);
+	if (ret < 0)
+		return ret;
+
+	sec = rxrpc_security_lookup(key->type_data.x[0]);
+	if (!sec)
+		return -EKEYREJECTED;
+	conn->security = sec;
+
+	ret = conn->security->init_connection_security(conn);
+	if (ret < 0) {
+		rxrpc_security_put(conn->security);
+		conn->security = NULL;
+		return ret;
+	}
+
+	_leave(" = 0");
+	return 0;
+}
+
+/*
+ * initialise the security on a server connection
+ */
+int rxrpc_init_server_conn_security(struct rxrpc_connection *conn)
+{
+	struct rxrpc_security *sec;
+	struct rxrpc_local *local = conn->trans->local;
+	struct rxrpc_sock *rx;
+	struct key *key;
+	key_ref_t kref;
+	char kdesc[5+1+3+1];
+
+	_enter("");
+
+	sprintf(kdesc, "%u:%u", ntohs(conn->service_id), conn->security_ix);
+
+	sec = rxrpc_security_lookup(conn->security_ix);
+	if (!sec) {
+		_leave(" = -ENOKEY [lookup]");
+		return -ENOKEY;
+	}
+
+	/* find the service */
+	read_lock_bh(&local->services_lock);
+	list_for_each_entry(rx, &local->services, listen_link) {
+		if (rx->service_id == conn->service_id)
+			goto found_service;
+	}
+
+	/* the service appears to have died */
+	read_unlock_bh(&local->services_lock);
+	rxrpc_security_put(sec);
+	_leave(" = -ENOENT");
+	return -ENOENT;
+
+found_service:
+	if (!rx->securities) {
+		read_unlock_bh(&local->services_lock);
+		rxrpc_security_put(sec);
+		_leave(" = -ENOKEY");
+		return -ENOKEY;
+	}
+
+	/* look through the service's keyring */
+	kref = keyring_search(make_key_ref(rx->securities, 1UL),
+			      &key_type_rxrpc_s, kdesc);
+	if (IS_ERR(kref)) {
+		read_unlock_bh(&local->services_lock);
+		rxrpc_security_put(sec);
+		_leave(" = %ld [search]", PTR_ERR(kref));
+		return PTR_ERR(kref);
+	}
+
+	key = key_ref_to_ptr(kref);
+	read_unlock_bh(&local->services_lock);
+
+	conn->server_key = key;
+	conn->security = sec;
+
+	_leave(" = 0");
+	return 0;
+}
+
+/*
+ * secure a packet prior to transmission
+ */
+int rxrpc_secure_packet(const struct rxrpc_call *call,
+			struct sk_buff *skb,
+			size_t data_size,
+			void *sechdr)
+{
+	if (call->conn->security)
+		return call->conn->security->secure_packet(
+			call, skb, data_size, sechdr);
+	return 0;
+}
+
+/*
+ * secure a packet prior to transmission
+ */
+int rxrpc_verify_packet(const struct rxrpc_call *call, struct sk_buff *skb,
+			u32 *_abort_code)
+{
+	if (call->conn->security)
+		return call->conn->security->verify_packet(
+			call, skb, _abort_code);
+	return 0;
+}
+
+/*
+ * clear connection security
+ */
+void rxrpc_clear_conn_security(struct rxrpc_connection *conn)
+{
+	_enter("{%d}", conn->debug_id);
+
+	if (conn->security) {
+		conn->security->clear(conn);
+		rxrpc_security_put(conn->security);
+		conn->security = NULL;
+	}
+
+	key_put(conn->key);
+	key_put(conn->server_key);
+}
diff --git a/net/rxrpc/ar-skbuff.c b/net/rxrpc/ar-skbuff.c
new file mode 100644
index 0000000..d73f6fc
--- /dev/null
+++ b/net/rxrpc/ar-skbuff.c
@@ -0,0 +1,118 @@
+/* ar-skbuff.c: socket buffer destruction handling
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+/*
+ * set up for the ACK at the end of the receive phase when we discard the final
+ * receive phase data packet
+ * - called with softirqs disabled
+ */
+static void rxrpc_request_final_ACK(struct rxrpc_call *call)
+{
+	/* the call may be aborted before we have a chance to ACK it */
+	write_lock(&call->state_lock);
+
+	switch (call->state) {
+	case RXRPC_CALL_CLIENT_RECV_REPLY:
+		call->state = RXRPC_CALL_CLIENT_FINAL_ACK;
+		_debug("request final ACK");
+
+		/* get an extra ref on the call for the final-ACK generator to
+		 * release */
+		rxrpc_get_call(call);
+		set_bit(RXRPC_CALL_ACK_FINAL, &call->events);
+		if (try_to_del_timer_sync(&call->ack_timer) >= 0)
+			schedule_work(&call->processor);
+		break;
+
+	case RXRPC_CALL_SERVER_RECV_REQUEST:
+		call->state = RXRPC_CALL_SERVER_ACK_REQUEST;
+	default:
+		break;
+	}
+
+	write_unlock(&call->state_lock);
+}
+
+/*
+ * drop the bottom ACK off of the call ACK window and advance the window
+ */
+static void rxrpc_hard_ACK_data(struct rxrpc_call *call,
+				struct rxrpc_skb_priv *sp)
+{
+	int loop;
+	u32 seq;
+
+	spin_lock_bh(&call->lock);
+
+	_debug("hard ACK #%u", ntohl(sp->hdr.seq));
+
+	for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) {
+		call->ackr_window[loop] >>= 1;
+		call->ackr_window[loop] |=
+			call->ackr_window[loop + 1] << (BITS_PER_LONG - 1);
+	}
+
+	seq = ntohl(sp->hdr.seq);
+	ASSERTCMP(seq, ==, call->rx_data_eaten + 1);
+	call->rx_data_eaten = seq;
+
+	if (call->ackr_win_top < UINT_MAX)
+		call->ackr_win_top++;
+
+	ASSERTIFCMP(call->state <= RXRPC_CALL_COMPLETE,
+		    call->rx_data_post, >=, call->rx_data_recv);
+	ASSERTIFCMP(call->state <= RXRPC_CALL_COMPLETE,
+		    call->rx_data_recv, >=, call->rx_data_eaten);
+
+	if (sp->hdr.flags & RXRPC_LAST_PACKET) {
+		rxrpc_request_final_ACK(call);
+	} else if (atomic_dec_and_test(&call->ackr_not_idle) &&
+		   test_and_clear_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags)) {
+		_debug("send Rx idle ACK");
+		__rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, sp->hdr.serial,
+				    true);
+	}
+
+	spin_unlock_bh(&call->lock);
+}
+
+/*
+ * destroy a packet that has an RxRPC control buffer
+ * - advance the hard-ACK state of the parent call (done here in case something
+ *   in the kernel bypasses recvmsg() and steals the packet directly off of the
+ *   socket receive queue)
+ */
+void rxrpc_packet_destructor(struct sk_buff *skb)
+{
+	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+	struct rxrpc_call *call = sp->call;
+
+	_enter("%p{%p}", skb, call);
+
+	if (call) {
+		/* send the final ACK on a client call */
+		if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA)
+			rxrpc_hard_ACK_data(call, sp);
+		rxrpc_put_call(call);
+		sp->call = NULL;
+	}
+
+	if (skb->sk)
+		sock_rfree(skb);
+	_leave("");
+}
diff --git a/net/rxrpc/ar-transport.c b/net/rxrpc/ar-transport.c
new file mode 100644
index 0000000..9b4e5cb
--- /dev/null
+++ b/net/rxrpc/ar-transport.c
@@ -0,0 +1,276 @@
+/* RxRPC point-to-point transport session management
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+static void rxrpc_transport_reaper(struct work_struct *work);
+
+static LIST_HEAD(rxrpc_transports);
+static DEFINE_RWLOCK(rxrpc_transport_lock);
+static unsigned long rxrpc_transport_timeout = 3600 * 24;
+static DECLARE_DELAYED_WORK(rxrpc_transport_reap, rxrpc_transport_reaper);
+
+/*
+ * allocate a new transport session manager
+ */
+static struct rxrpc_transport *rxrpc_alloc_transport(struct rxrpc_local *local,
+						     struct rxrpc_peer *peer,
+						     gfp_t gfp)
+{
+	struct rxrpc_transport *trans;
+
+	_enter("");
+
+	trans = kzalloc(sizeof(struct rxrpc_transport), gfp);
+	if (trans) {
+		trans->local = local;
+		trans->peer = peer;
+		INIT_LIST_HEAD(&trans->link);
+		trans->bundles = RB_ROOT;
+		trans->client_conns = RB_ROOT;
+		trans->server_conns = RB_ROOT;
+		skb_queue_head_init(&trans->error_queue);
+		spin_lock_init(&trans->client_lock);
+		rwlock_init(&trans->conn_lock);
+		atomic_set(&trans->usage, 1);
+		trans->debug_id = atomic_inc_return(&rxrpc_debug_id);
+
+		if (peer->srx.transport.family == AF_INET) {
+			switch (peer->srx.transport_type) {
+			case SOCK_DGRAM:
+				INIT_WORK(&trans->error_handler,
+					  rxrpc_UDP_error_handler);
+				break;
+			default:
+				BUG();
+				break;
+			}
+		} else {
+			BUG();
+		}
+	}
+
+	_leave(" = %p", trans);
+	return trans;
+}
+
+/*
+ * obtain a transport session for the nominated endpoints
+ */
+struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *local,
+					    struct rxrpc_peer *peer,
+					    gfp_t gfp)
+{
+	struct rxrpc_transport *trans, *candidate;
+	const char *new = "old";
+	int usage;
+
+	_enter("{%u.%u.%u.%u+%hu},{%u.%u.%u.%u+%hu},",
+	       NIPQUAD(local->srx.transport.sin.sin_addr),
+	       ntohs(local->srx.transport.sin.sin_port),
+	       NIPQUAD(peer->srx.transport.sin.sin_addr),
+	       ntohs(peer->srx.transport.sin.sin_port));
+
+	/* search the transport list first */
+	read_lock_bh(&rxrpc_transport_lock);
+	list_for_each_entry(trans, &rxrpc_transports, link) {
+		if (trans->local == local && trans->peer == peer)
+			goto found_extant_transport;
+	}
+	read_unlock_bh(&rxrpc_transport_lock);
+
+	/* not yet present - create a candidate for a new record and then
+	 * redo the search */
+	candidate = rxrpc_alloc_transport(local, peer, gfp);
+	if (!candidate) {
+		_leave(" = -ENOMEM");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	write_lock_bh(&rxrpc_transport_lock);
+
+	list_for_each_entry(trans, &rxrpc_transports, link) {
+		if (trans->local == local && trans->peer == peer)
+			goto found_extant_second;
+	}
+
+	/* we can now add the new candidate to the list */
+	trans = candidate;
+	candidate = NULL;
+
+	rxrpc_get_local(trans->local);
+	atomic_inc(&trans->peer->usage);
+	list_add_tail(&trans->link, &rxrpc_transports);
+	write_unlock_bh(&rxrpc_transport_lock);
+	new = "new";
+
+success:
+	_net("TRANSPORT %s %d local %d -> peer %d",
+	     new,
+	     trans->debug_id,
+	     trans->local->debug_id,
+	     trans->peer->debug_id);
+
+	_leave(" = %p {u=%d}", trans, atomic_read(&trans->usage));
+	return trans;
+
+	/* we found the transport in the list immediately */
+found_extant_transport:
+	usage = atomic_inc_return(&trans->usage);
+	read_unlock_bh(&rxrpc_transport_lock);
+	goto success;
+
+	/* we found the transport on the second time through the list */
+found_extant_second:
+	usage = atomic_inc_return(&trans->usage);
+	write_unlock_bh(&rxrpc_transport_lock);
+	kfree(candidate);
+	goto success;
+}
+
+/*
+ * find the transport connecting two endpoints
+ */
+struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *local,
+					     struct rxrpc_peer *peer)
+{
+	struct rxrpc_transport *trans;
+
+	_enter("{%u.%u.%u.%u+%hu},{%u.%u.%u.%u+%hu},",
+	       NIPQUAD(local->srx.transport.sin.sin_addr),
+	       ntohs(local->srx.transport.sin.sin_port),
+	       NIPQUAD(peer->srx.transport.sin.sin_addr),
+	       ntohs(peer->srx.transport.sin.sin_port));
+
+	/* search the transport list */
+	read_lock_bh(&rxrpc_transport_lock);
+
+	list_for_each_entry(trans, &rxrpc_transports, link) {
+		if (trans->local == local && trans->peer == peer)
+			goto found_extant_transport;
+	}
+
+	read_unlock_bh(&rxrpc_transport_lock);
+	_leave(" = NULL");
+	return NULL;
+
+found_extant_transport:
+	atomic_inc(&trans->usage);
+	read_unlock_bh(&rxrpc_transport_lock);
+	_leave(" = %p", trans);
+	return trans;
+}
+
+/*
+ * release a transport session
+ */
+void rxrpc_put_transport(struct rxrpc_transport *trans)
+{
+	_enter("%p{u=%d}", trans, atomic_read(&trans->usage));
+
+	ASSERTCMP(atomic_read(&trans->usage), >, 0);
+
+	trans->put_time = xtime.tv_sec;
+	if (unlikely(atomic_dec_and_test(&trans->usage)))
+		_debug("zombie");
+		/* let the reaper determine the timeout to avoid a race with
+		 * overextending the timeout if the reaper is running at the
+		 * same time */
+		schedule_delayed_work(&rxrpc_transport_reap, 0);
+	_leave("");
+}
+
+/*
+ * clean up a transport session
+ */
+static void rxrpc_cleanup_transport(struct rxrpc_transport *trans)
+{
+	_net("DESTROY TRANS %d", trans->debug_id);
+
+	rxrpc_purge_queue(&trans->error_queue);
+
+	rxrpc_put_local(trans->local);
+	rxrpc_put_peer(trans->peer);
+	kfree(trans);
+}
+
+/*
+ * reap dead transports that have passed their expiry date
+ */
+static void rxrpc_transport_reaper(struct work_struct *work)
+{
+	struct rxrpc_transport *trans, *_p;
+	unsigned long now, earliest, reap_time;
+
+	LIST_HEAD(graveyard);
+
+	_enter("");
+
+	now = xtime.tv_sec;
+	earliest = ULONG_MAX;
+
+	/* extract all the transports that have been dead too long */
+	write_lock_bh(&rxrpc_transport_lock);
+	list_for_each_entry_safe(trans, _p, &rxrpc_transports, link) {
+		_debug("reap TRANS %d { u=%d t=%ld }",
+		       trans->debug_id, atomic_read(&trans->usage),
+		       (long) now - (long) trans->put_time);
+
+		if (likely(atomic_read(&trans->usage) > 0))
+			continue;
+
+		reap_time = trans->put_time + rxrpc_transport_timeout;
+		if (reap_time <= now)
+			list_move_tail(&trans->link, &graveyard);
+		else if (reap_time < earliest)
+			earliest = reap_time;
+	}
+	write_unlock_bh(&rxrpc_transport_lock);
+
+	if (earliest != ULONG_MAX) {
+		_debug("reschedule reaper %ld", (long) earliest - now);
+		ASSERTCMP(earliest, >, now);
+		schedule_delayed_work(&rxrpc_transport_reap,
+				      (earliest - now) * HZ);
+	}
+
+	/* then destroy all those pulled out */
+	while (!list_empty(&graveyard)) {
+		trans = list_entry(graveyard.next, struct rxrpc_transport,
+				   link);
+		list_del_init(&trans->link);
+
+		ASSERTCMP(atomic_read(&trans->usage), ==, 0);
+		rxrpc_cleanup_transport(trans);
+	}
+
+	_leave("");
+}
+
+/*
+ * preemptively destroy all the transport session records rather than waiting
+ * for them to time out
+ */
+void __exit rxrpc_destroy_all_transports(void)
+{
+	_enter("");
+
+	rxrpc_transport_timeout = 0;
+	cancel_delayed_work(&rxrpc_transport_reap);
+	schedule_delayed_work(&rxrpc_transport_reap, 0);
+
+	_leave("");
+}
diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
new file mode 100644
index 0000000..1eaf529
--- /dev/null
+++ b/net/rxrpc/rxkad.c
@@ -0,0 +1,1153 @@
+/* Kerberos-based RxRPC security
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/udp.h>
+#include <linux/crypto.h>
+#include <linux/scatterlist.h>
+#include <linux/ctype.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include "ar-internal.h"
+
+#define RXKAD_VERSION			2
+#define MAXKRB5TICKETLEN		1024
+#define RXKAD_TKT_TYPE_KERBEROS_V5	256
+#define ANAME_SZ			40	/* size of authentication name */
+#define INST_SZ				40	/* size of principal's instance */
+#define REALM_SZ			40	/* size of principal's auth domain */
+#define SNAME_SZ			40	/* size of service name */
+
+unsigned rxrpc_debug;
+module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(rxrpc_debug, "rxkad debugging mask");
+
+struct rxkad_level1_hdr {
+	__be32	data_size;	/* true data size (excluding padding) */
+};
+
+struct rxkad_level2_hdr {
+	__be32	data_size;	/* true data size (excluding padding) */
+	__be32	checksum;	/* decrypted data checksum */
+};
+
+MODULE_DESCRIPTION("RxRPC network protocol type-2 security (Kerberos)");
+MODULE_AUTHOR("Red Hat, Inc.");
+MODULE_LICENSE("GPL");
+
+/*
+ * this holds a pinned cipher so that keventd doesn't get called by the cipher
+ * alloc routine, but since we have it to hand, we use it to decrypt RESPONSE
+ * packets
+ */
+static struct crypto_blkcipher *rxkad_ci;
+static DEFINE_MUTEX(rxkad_ci_mutex);
+
+/*
+ * initialise connection security
+ */
+static int rxkad_init_connection_security(struct rxrpc_connection *conn)
+{
+	struct rxrpc_key_payload *payload;
+	struct crypto_blkcipher *ci;
+	int ret;
+
+	_enter("{%d},{%x}", conn->debug_id, key_serial(conn->key));
+
+	payload = conn->key->payload.data;
+	conn->security_ix = payload->k.security_index;
+
+	ci = crypto_alloc_blkcipher("pcbc(fcrypt)", 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(ci)) {
+		_debug("no cipher");
+		ret = PTR_ERR(ci);
+		goto error;
+	}
+
+	if (crypto_blkcipher_setkey(ci, payload->k.session_key,
+				    sizeof(payload->k.session_key)) < 0)
+		BUG();
+
+	switch (conn->security_level) {
+	case RXRPC_SECURITY_PLAIN:
+		break;
+	case RXRPC_SECURITY_AUTH:
+		conn->size_align = 8;
+		conn->security_size = sizeof(struct rxkad_level1_hdr);
+		conn->header_size += sizeof(struct rxkad_level1_hdr);
+		break;
+	case RXRPC_SECURITY_ENCRYPT:
+		conn->size_align = 8;
+		conn->security_size = sizeof(struct rxkad_level2_hdr);
+		conn->header_size += sizeof(struct rxkad_level2_hdr);
+		break;
+	default:
+		ret = -EKEYREJECTED;
+		goto error;
+	}
+
+	conn->cipher = ci;
+	ret = 0;
+error:
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * prime the encryption state with the invariant parts of a connection's
+ * description
+ */
+static void rxkad_prime_packet_security(struct rxrpc_connection *conn)
+{
+	struct rxrpc_key_payload *payload;
+	struct blkcipher_desc desc;
+	struct scatterlist sg[2];
+	struct rxrpc_crypt iv;
+	struct {
+		__be32 x[4];
+	} tmpbuf __attribute__((aligned(16))); /* must all be in same page */
+
+	_enter("");
+
+	if (!conn->key)
+		return;
+
+	payload = conn->key->payload.data;
+	memcpy(&iv, payload->k.session_key, sizeof(iv));
+
+	desc.tfm = conn->cipher;
+	desc.info = iv.x;
+	desc.flags = 0;
+
+	tmpbuf.x[0] = conn->epoch;
+	tmpbuf.x[1] = conn->cid;
+	tmpbuf.x[2] = 0;
+	tmpbuf.x[3] = htonl(conn->security_ix);
+
+	memset(sg, 0, sizeof(sg));
+	sg_set_buf(&sg[0], &tmpbuf, sizeof(tmpbuf));
+	sg_set_buf(&sg[1], &tmpbuf, sizeof(tmpbuf));
+	crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf));
+
+	memcpy(&conn->csum_iv, &tmpbuf.x[2], sizeof(conn->csum_iv));
+	ASSERTCMP(conn->csum_iv.n[0], ==, tmpbuf.x[2]);
+
+	_leave("");
+}
+
+/*
+ * partially encrypt a packet (level 1 security)
+ */
+static int rxkad_secure_packet_auth(const struct rxrpc_call *call,
+				    struct sk_buff *skb,
+				    u32 data_size,
+				    void *sechdr)
+{
+	struct rxrpc_skb_priv *sp;
+	struct blkcipher_desc desc;
+	struct rxrpc_crypt iv;
+	struct scatterlist sg[2];
+	struct {
+		struct rxkad_level1_hdr hdr;
+		__be32	first;	/* first four bytes of data and padding */
+	} tmpbuf __attribute__((aligned(8))); /* must all be in same page */
+	u16 check;
+
+	sp = rxrpc_skb(skb);
+
+	_enter("");
+
+	check = ntohl(sp->hdr.seq ^ sp->hdr.callNumber);
+	data_size |= (u32) check << 16;
+
+	tmpbuf.hdr.data_size = htonl(data_size);
+	memcpy(&tmpbuf.first, sechdr + 4, sizeof(tmpbuf.first));
+
+	/* start the encryption afresh */
+	memset(&iv, 0, sizeof(iv));
+	desc.tfm = call->conn->cipher;
+	desc.info = iv.x;
+	desc.flags = 0;
+
+	memset(sg, 0, sizeof(sg));
+	sg_set_buf(&sg[0], &tmpbuf, sizeof(tmpbuf));
+	sg_set_buf(&sg[1], &tmpbuf, sizeof(tmpbuf));
+	crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf));
+
+	memcpy(sechdr, &tmpbuf, sizeof(tmpbuf));
+
+	_leave(" = 0");
+	return 0;
+}
+
+/*
+ * wholly encrypt a packet (level 2 security)
+ */
+static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call,
+					struct sk_buff *skb,
+					u32 data_size,
+					void *sechdr)
+{
+	const struct rxrpc_key_payload *payload;
+	struct rxkad_level2_hdr rxkhdr
+		__attribute__((aligned(8))); /* must be all on one page */
+	struct rxrpc_skb_priv *sp;
+	struct blkcipher_desc desc;
+	struct rxrpc_crypt iv;
+	struct scatterlist sg[16];
+	struct sk_buff *trailer;
+	unsigned len;
+	u16 check;
+	int nsg;
+
+	sp = rxrpc_skb(skb);
+
+	_enter("");
+
+	check = ntohl(sp->hdr.seq ^ sp->hdr.callNumber);
+
+	rxkhdr.data_size = htonl(data_size | (u32) check << 16);
+	rxkhdr.checksum = 0;
+
+	/* encrypt from the session key */
+	payload = call->conn->key->payload.data;
+	memcpy(&iv, payload->k.session_key, sizeof(iv));
+	desc.tfm = call->conn->cipher;
+	desc.info = iv.x;
+	desc.flags = 0;
+
+	memset(sg, 0, sizeof(sg[0]) * 2);
+	sg_set_buf(&sg[0], sechdr, sizeof(rxkhdr));
+	sg_set_buf(&sg[1], &rxkhdr, sizeof(rxkhdr));
+	crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(rxkhdr));
+
+	/* we want to encrypt the skbuff in-place */
+	nsg = skb_cow_data(skb, 0, &trailer);
+	if (nsg < 0 || nsg > 16)
+		return -ENOMEM;
+
+	len = data_size + call->conn->size_align - 1;
+	len &= ~(call->conn->size_align - 1);
+
+	skb_to_sgvec(skb, sg, 0, len);
+	crypto_blkcipher_encrypt_iv(&desc, sg, sg, len);
+
+	_leave(" = 0");
+	return 0;
+}
+
+/*
+ * checksum an RxRPC packet header
+ */
+static int rxkad_secure_packet(const struct rxrpc_call *call,
+				struct sk_buff *skb,
+				size_t data_size,
+				void *sechdr)
+{
+	struct rxrpc_skb_priv *sp;
+	struct blkcipher_desc desc;
+	struct rxrpc_crypt iv;
+	struct scatterlist sg[2];
+	struct {
+		__be32 x[2];
+	} tmpbuf __attribute__((aligned(8))); /* must all be in same page */
+	__be32 x;
+	int ret;
+
+	sp = rxrpc_skb(skb);
+
+	_enter("{%d{%x}},{#%u},%zu,",
+	       call->debug_id, key_serial(call->conn->key), ntohl(sp->hdr.seq),
+	       data_size);
+
+	if (!call->conn->cipher)
+		return 0;
+
+	ret = key_validate(call->conn->key);
+	if (ret < 0)
+		return ret;
+
+	/* continue encrypting from where we left off */
+	memcpy(&iv, call->conn->csum_iv.x, sizeof(iv));
+	desc.tfm = call->conn->cipher;
+	desc.info = iv.x;
+	desc.flags = 0;
+
+	/* calculate the security checksum */
+	x = htonl(call->channel << (32 - RXRPC_CIDSHIFT));
+	x |= sp->hdr.seq & __constant_cpu_to_be32(0x3fffffff);
+	tmpbuf.x[0] = sp->hdr.callNumber;
+	tmpbuf.x[1] = x;
+
+	memset(&sg, 0, sizeof(sg));
+	sg_set_buf(&sg[0], &tmpbuf, sizeof(tmpbuf));
+	sg_set_buf(&sg[1], &tmpbuf, sizeof(tmpbuf));
+	crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf));
+
+	x = ntohl(tmpbuf.x[1]);
+	x = (x >> 16) & 0xffff;
+	if (x == 0)
+		x = 1; /* zero checksums are not permitted */
+	sp->hdr.cksum = htons(x);
+
+	switch (call->conn->security_level) {
+	case RXRPC_SECURITY_PLAIN:
+		ret = 0;
+		break;
+	case RXRPC_SECURITY_AUTH:
+		ret = rxkad_secure_packet_auth(call, skb, data_size, sechdr);
+		break;
+	case RXRPC_SECURITY_ENCRYPT:
+		ret = rxkad_secure_packet_encrypt(call, skb, data_size,
+						  sechdr);
+		break;
+	default:
+		ret = -EPERM;
+		break;
+	}
+
+	_leave(" = %d [set %hx]", ret, x);
+	return ret;
+}
+
+/*
+ * decrypt partial encryption on a packet (level 1 security)
+ */
+static int rxkad_verify_packet_auth(const struct rxrpc_call *call,
+				    struct sk_buff *skb,
+				    u32 *_abort_code)
+{
+	struct rxkad_level1_hdr sechdr;
+	struct rxrpc_skb_priv *sp;
+	struct blkcipher_desc desc;
+	struct rxrpc_crypt iv;
+	struct scatterlist sg[2];
+	struct sk_buff *trailer;
+	u32 data_size, buf;
+	u16 check;
+
+	_enter("");
+
+	sp = rxrpc_skb(skb);
+
+	/* we want to decrypt the skbuff in-place */
+	if (skb_cow_data(skb, 0, &trailer) < 0)
+		goto nomem;
+
+	skb_to_sgvec(skb, sg, 0, 8);
+
+	/* start the decryption afresh */
+	memset(&iv, 0, sizeof(iv));
+	desc.tfm = call->conn->cipher;
+	desc.info = iv.x;
+	desc.flags = 0;
+
+	crypto_blkcipher_decrypt_iv(&desc, sg, sg, 8);
+
+	/* remove the decrypted packet length */
+	if (skb_copy_bits(skb, 0, &sechdr, sizeof(sechdr)) < 0)
+		goto datalen_error;
+	if (!skb_pull(skb, sizeof(sechdr)))
+		BUG();
+
+	buf = ntohl(sechdr.data_size);
+	data_size = buf & 0xffff;
+
+	check = buf >> 16;
+	check ^= ntohl(sp->hdr.seq ^ sp->hdr.callNumber);
+	check &= 0xffff;
+	if (check != 0) {
+		*_abort_code = RXKADSEALEDINCON;
+		goto protocol_error;
+	}
+
+	/* shorten the packet to remove the padding */
+	if (data_size > skb->len)
+		goto datalen_error;
+	else if (data_size < skb->len)
+		skb->len = data_size;
+
+	_leave(" = 0 [dlen=%x]", data_size);
+	return 0;
+
+datalen_error:
+	*_abort_code = RXKADDATALEN;
+protocol_error:
+	_leave(" = -EPROTO");
+	return -EPROTO;
+
+nomem:
+	_leave(" = -ENOMEM");
+	return -ENOMEM;
+}
+
+/*
+ * wholly decrypt a packet (level 2 security)
+ */
+static int rxkad_verify_packet_encrypt(const struct rxrpc_call *call,
+				       struct sk_buff *skb,
+				       u32 *_abort_code)
+{
+	const struct rxrpc_key_payload *payload;
+	struct rxkad_level2_hdr sechdr;
+	struct rxrpc_skb_priv *sp;
+	struct blkcipher_desc desc;
+	struct rxrpc_crypt iv;
+	struct scatterlist _sg[4], *sg;
+	struct sk_buff *trailer;
+	u32 data_size, buf;
+	u16 check;
+	int nsg;
+
+	_enter(",{%d}", skb->len);
+
+	sp = rxrpc_skb(skb);
+
+	/* we want to decrypt the skbuff in-place */
+	nsg = skb_cow_data(skb, 0, &trailer);
+	if (nsg < 0)
+		goto nomem;
+
+	sg = _sg;
+	if (unlikely(nsg > 4)) {
+		sg = kmalloc(sizeof(*sg) * nsg, GFP_NOIO);
+		if (!sg)
+			goto nomem;
+	}
+
+	skb_to_sgvec(skb, sg, 0, skb->len);
+
+	/* decrypt from the session key */
+	payload = call->conn->key->payload.data;
+	memcpy(&iv, payload->k.session_key, sizeof(iv));
+	desc.tfm = call->conn->cipher;
+	desc.info = iv.x;
+	desc.flags = 0;
+
+	crypto_blkcipher_decrypt_iv(&desc, sg, sg, skb->len);
+	if (sg != _sg)
+		kfree(sg);
+
+	/* remove the decrypted packet length */
+	if (skb_copy_bits(skb, 0, &sechdr, sizeof(sechdr)) < 0)
+		goto datalen_error;
+	if (!skb_pull(skb, sizeof(sechdr)))
+		BUG();
+
+	buf = ntohl(sechdr.data_size);
+	data_size = buf & 0xffff;
+
+	check = buf >> 16;
+	check ^= ntohl(sp->hdr.seq ^ sp->hdr.callNumber);
+	check &= 0xffff;
+	if (check != 0) {
+		*_abort_code = RXKADSEALEDINCON;
+		goto protocol_error;
+	}
+
+	/* shorten the packet to remove the padding */
+	if (data_size > skb->len)
+		goto datalen_error;
+	else if (data_size < skb->len)
+		skb->len = data_size;
+
+	_leave(" = 0 [dlen=%x]", data_size);
+	return 0;
+
+datalen_error:
+	*_abort_code = RXKADDATALEN;
+protocol_error:
+	_leave(" = -EPROTO");
+	return -EPROTO;
+
+nomem:
+	_leave(" = -ENOMEM");
+	return -ENOMEM;
+}
+
+/*
+ * verify the security on a received packet
+ */
+static int rxkad_verify_packet(const struct rxrpc_call *call,
+			       struct sk_buff *skb,
+			       u32 *_abort_code)
+{
+	struct blkcipher_desc desc;
+	struct rxrpc_skb_priv *sp;
+	struct rxrpc_crypt iv;
+	struct scatterlist sg[2];
+	struct {
+		__be32 x[2];
+	} tmpbuf __attribute__((aligned(8))); /* must all be in same page */
+	__be32 x;
+	__be16 cksum;
+	int ret;
+
+	sp = rxrpc_skb(skb);
+
+	_enter("{%d{%x}},{#%u}",
+	       call->debug_id, key_serial(call->conn->key),
+	       ntohl(sp->hdr.seq));
+
+	if (!call->conn->cipher)
+		return 0;
+
+	if (sp->hdr.securityIndex != 2) {
+		*_abort_code = RXKADINCONSISTENCY;
+		_leave(" = -EPROTO [not rxkad]");
+		return -EPROTO;
+	}
+
+	/* continue encrypting from where we left off */
+	memcpy(&iv, call->conn->csum_iv.x, sizeof(iv));
+	desc.tfm = call->conn->cipher;
+	desc.info = iv.x;
+	desc.flags = 0;
+
+	/* validate the security checksum */
+	x = htonl(call->channel << (32 - RXRPC_CIDSHIFT));
+	x |= sp->hdr.seq & __constant_cpu_to_be32(0x3fffffff);
+	tmpbuf.x[0] = call->call_id;
+	tmpbuf.x[1] = x;
+
+	memset(&sg, 0, sizeof(sg));
+	sg_set_buf(&sg[0], &tmpbuf, sizeof(tmpbuf));
+	sg_set_buf(&sg[1], &tmpbuf, sizeof(tmpbuf));
+	crypto_blkcipher_encrypt_iv(&desc, &sg[0], &sg[1], sizeof(tmpbuf));
+
+	x = ntohl(tmpbuf.x[1]);
+	x = (x >> 16) & 0xffff;
+	if (x == 0)
+		x = 1; /* zero checksums are not permitted */
+
+	cksum = htons(x);
+	if (sp->hdr.cksum != cksum) {
+		*_abort_code = RXKADSEALEDINCON;
+		_leave(" = -EPROTO [csum failed]");
+		return -EPROTO;
+	}
+
+	switch (call->conn->security_level) {
+	case RXRPC_SECURITY_PLAIN:
+		ret = 0;
+		break;
+	case RXRPC_SECURITY_AUTH:
+		ret = rxkad_verify_packet_auth(call, skb, _abort_code);
+		break;
+	case RXRPC_SECURITY_ENCRYPT:
+		ret = rxkad_verify_packet_encrypt(call, skb, _abort_code);
+		break;
+	default:
+		ret = -ENOANO;
+		break;
+	}
+
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * issue a challenge
+ */
+static int rxkad_issue_challenge(struct rxrpc_connection *conn)
+{
+	struct rxkad_challenge challenge;
+	struct rxrpc_header hdr;
+	struct msghdr msg;
+	struct kvec iov[2];
+	size_t len;
+	int ret;
+
+	_enter("{%d,%x}", conn->debug_id, key_serial(conn->key));
+
+	ret = key_validate(conn->key);
+	if (ret < 0)
+		return ret;
+
+	get_random_bytes(&conn->security_nonce, sizeof(conn->security_nonce));
+
+	challenge.version	= htonl(2);
+	challenge.nonce		= htonl(conn->security_nonce);
+	challenge.min_level	= htonl(0);
+	challenge.__padding	= 0;
+
+	msg.msg_name	= &conn->trans->peer->srx.transport.sin;
+	msg.msg_namelen	= sizeof(conn->trans->peer->srx.transport.sin);
+	msg.msg_control	= NULL;
+	msg.msg_controllen = 0;
+	msg.msg_flags	= 0;
+
+	hdr.epoch	= conn->epoch;
+	hdr.cid		= conn->cid;
+	hdr.callNumber	= 0;
+	hdr.seq		= 0;
+	hdr.type	= RXRPC_PACKET_TYPE_CHALLENGE;
+	hdr.flags	= conn->out_clientflag;
+	hdr.userStatus	= 0;
+	hdr.securityIndex = conn->security_ix;
+	hdr._rsvd	= 0;
+	hdr.serviceId	= conn->service_id;
+
+	iov[0].iov_base	= &hdr;
+	iov[0].iov_len	= sizeof(hdr);
+	iov[1].iov_base	= &challenge;
+	iov[1].iov_len	= sizeof(challenge);
+
+	len = iov[0].iov_len + iov[1].iov_len;
+
+	hdr.serial = htonl(atomic_inc_return(&conn->serial));
+	_proto("Tx CHALLENGE %%%u", ntohl(hdr.serial));
+
+	ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 2, len);
+	if (ret < 0) {
+		_debug("sendmsg failed: %d", ret);
+		return -EAGAIN;
+	}
+
+	_leave(" = 0");
+	return 0;
+}
+
+/*
+ * send a Kerberos security response
+ */
+static int rxkad_send_response(struct rxrpc_connection *conn,
+			       struct rxrpc_header *hdr,
+			       struct rxkad_response *resp,
+			       const struct rxkad_key *s2)
+{
+	struct msghdr msg;
+	struct kvec iov[3];
+	size_t len;
+	int ret;
+
+	_enter("");
+
+	msg.msg_name	= &conn->trans->peer->srx.transport.sin;
+	msg.msg_namelen	= sizeof(conn->trans->peer->srx.transport.sin);
+	msg.msg_control	= NULL;
+	msg.msg_controllen = 0;
+	msg.msg_flags	= 0;
+
+	hdr->epoch	= conn->epoch;
+	hdr->seq	= 0;
+	hdr->type	= RXRPC_PACKET_TYPE_RESPONSE;
+	hdr->flags	= conn->out_clientflag;
+	hdr->userStatus	= 0;
+	hdr->_rsvd	= 0;
+
+	iov[0].iov_base	= hdr;
+	iov[0].iov_len	= sizeof(*hdr);
+	iov[1].iov_base	= resp;
+	iov[1].iov_len	= sizeof(*resp);
+	iov[2].iov_base	= (void *) s2->ticket;
+	iov[2].iov_len	= s2->ticket_len;
+
+	len = iov[0].iov_len + iov[1].iov_len + iov[2].iov_len;
+
+	hdr->serial = htonl(atomic_inc_return(&conn->serial));
+	_proto("Tx RESPONSE %%%u", ntohl(hdr->serial));
+
+	ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 3, len);
+	if (ret < 0) {
+		_debug("sendmsg failed: %d", ret);
+		return -EAGAIN;
+	}
+
+	_leave(" = 0");
+	return 0;
+}
+
+/*
+ * calculate the response checksum
+ */
+static void rxkad_calc_response_checksum(struct rxkad_response *response)
+{
+	u32 csum = 1000003;
+	int loop;
+	u8 *p = (u8 *) response;
+
+	for (loop = sizeof(*response); loop > 0; loop--)
+		csum = csum * 0x10204081 + *p++;
+
+	response->encrypted.checksum = htonl(csum);
+}
+
+/*
+ * load a scatterlist with a potentially split-page buffer
+ */
+static void rxkad_sg_set_buf2(struct scatterlist sg[2],
+			      void *buf, size_t buflen)
+{
+
+	memset(sg, 0, sizeof(sg));
+
+	sg_set_buf(&sg[0], buf, buflen);
+	if (sg[0].offset + buflen > PAGE_SIZE) {
+		/* the buffer was split over two pages */
+		sg[0].length = PAGE_SIZE - sg[0].offset;
+		sg_set_buf(&sg[1], buf + sg[0].length, buflen - sg[0].length);
+	}
+
+	ASSERTCMP(sg[0].length + sg[1].length, ==, buflen);
+}
+
+/*
+ * encrypt the response packet
+ */
+static void rxkad_encrypt_response(struct rxrpc_connection *conn,
+				   struct rxkad_response *resp,
+				   const struct rxkad_key *s2)
+{
+	struct blkcipher_desc desc;
+	struct rxrpc_crypt iv;
+	struct scatterlist ssg[2], dsg[2];
+
+	/* continue encrypting from where we left off */
+	memcpy(&iv, s2->session_key, sizeof(iv));
+	desc.tfm = conn->cipher;
+	desc.info = iv.x;
+	desc.flags = 0;
+
+	rxkad_sg_set_buf2(ssg, &resp->encrypted, sizeof(resp->encrypted));
+	memcpy(dsg, ssg, sizeof(dsg));
+	crypto_blkcipher_encrypt_iv(&desc, dsg, ssg, sizeof(resp->encrypted));
+}
+
+/*
+ * respond to a challenge packet
+ */
+static int rxkad_respond_to_challenge(struct rxrpc_connection *conn,
+				      struct sk_buff *skb,
+				      u32 *_abort_code)
+{
+	const struct rxrpc_key_payload *payload;
+	struct rxkad_challenge challenge;
+	struct rxkad_response resp
+		__attribute__((aligned(8))); /* must be aligned for crypto */
+	struct rxrpc_skb_priv *sp;
+	u32 version, nonce, min_level, abort_code;
+	int ret;
+
+	_enter("{%d,%x}", conn->debug_id, key_serial(conn->key));
+
+	if (!conn->key) {
+		_leave(" = -EPROTO [no key]");
+		return -EPROTO;
+	}
+
+	ret = key_validate(conn->key);
+	if (ret < 0) {
+		*_abort_code = RXKADEXPIRED;
+		return ret;
+	}
+
+	abort_code = RXKADPACKETSHORT;
+	sp = rxrpc_skb(skb);
+	if (skb_copy_bits(skb, 0, &challenge, sizeof(challenge)) < 0)
+		goto protocol_error;
+
+	version = ntohl(challenge.version);
+	nonce = ntohl(challenge.nonce);
+	min_level = ntohl(challenge.min_level);
+
+	_proto("Rx CHALLENGE %%%u { v=%u n=%u ml=%u }",
+	       ntohl(sp->hdr.serial), version, nonce, min_level);
+
+	abort_code = RXKADINCONSISTENCY;
+	if (version != RXKAD_VERSION)
+		goto protocol_error;
+
+	abort_code = RXKADLEVELFAIL;
+	if (conn->security_level < min_level)
+		goto protocol_error;
+
+	payload = conn->key->payload.data;
+
+	/* build the response packet */
+	memset(&resp, 0, sizeof(resp));
+
+	resp.version = RXKAD_VERSION;
+	resp.encrypted.epoch = conn->epoch;
+	resp.encrypted.cid = conn->cid;
+	resp.encrypted.securityIndex = htonl(conn->security_ix);
+	resp.encrypted.call_id[0] =
+		(conn->channels[0] ? conn->channels[0]->call_id : 0);
+	resp.encrypted.call_id[1] =
+		(conn->channels[1] ? conn->channels[1]->call_id : 0);
+	resp.encrypted.call_id[2] =
+		(conn->channels[2] ? conn->channels[2]->call_id : 0);
+	resp.encrypted.call_id[3] =
+		(conn->channels[3] ? conn->channels[3]->call_id : 0);
+	resp.encrypted.inc_nonce = htonl(nonce + 1);
+	resp.encrypted.level = htonl(conn->security_level);
+	resp.kvno = htonl(payload->k.kvno);
+	resp.ticket_len = htonl(payload->k.ticket_len);
+
+	/* calculate the response checksum and then do the encryption */
+	rxkad_calc_response_checksum(&resp);
+	rxkad_encrypt_response(conn, &resp, &payload->k);
+	return rxkad_send_response(conn, &sp->hdr, &resp, &payload->k);
+
+protocol_error:
+	*_abort_code = abort_code;
+	_leave(" = -EPROTO [%d]", abort_code);
+	return -EPROTO;
+}
+
+/*
+ * decrypt the kerberos IV ticket in the response
+ */
+static int rxkad_decrypt_ticket(struct rxrpc_connection *conn,
+				void *ticket, size_t ticket_len,
+				struct rxrpc_crypt *_session_key,
+				time_t *_expiry,
+				u32 *_abort_code)
+{
+	struct blkcipher_desc desc;
+	struct rxrpc_crypt iv, key;
+	struct scatterlist ssg[1], dsg[1];
+	struct in_addr addr;
+	unsigned life;
+	time_t issue, now;
+	bool little_endian;
+	int ret;
+	u8 *p, *q, *name, *end;
+
+	_enter("{%d},{%x}", conn->debug_id, key_serial(conn->server_key));
+
+	*_expiry = 0;
+
+	ret = key_validate(conn->server_key);
+	if (ret < 0) {
+		switch (ret) {
+		case -EKEYEXPIRED:
+			*_abort_code = RXKADEXPIRED;
+			goto error;
+		default:
+			*_abort_code = RXKADNOAUTH;
+			goto error;
+		}
+	}
+
+	ASSERT(conn->server_key->payload.data != NULL);
+	ASSERTCMP((unsigned long) ticket & 7UL, ==, 0);
+
+	memcpy(&iv, &conn->server_key->type_data, sizeof(iv));
+
+	desc.tfm = conn->server_key->payload.data;
+	desc.info = iv.x;
+	desc.flags = 0;
+
+	sg_init_one(&ssg[0], ticket, ticket_len);
+	memcpy(dsg, ssg, sizeof(dsg));
+	crypto_blkcipher_decrypt_iv(&desc, dsg, ssg, ticket_len);
+
+	p = ticket;
+	end = p + ticket_len;
+
+#define Z(size)						\
+	({						\
+		u8 *__str = p;				\
+		q = memchr(p, 0, end - p);		\
+		if (!q || q - p > (size))		\
+			goto bad_ticket;		\
+		for (; p < q; p++)			\
+			if (!isprint(*p))		\
+				goto bad_ticket;	\
+		p++;					\
+		__str;					\
+	})
+
+	/* extract the ticket flags */
+	_debug("KIV FLAGS: %x", *p);
+	little_endian = *p & 1;
+	p++;
+
+	/* extract the authentication name */
+	name = Z(ANAME_SZ);
+	_debug("KIV ANAME: %s", name);
+
+	/* extract the principal's instance */
+	name = Z(INST_SZ);
+	_debug("KIV INST : %s", name);
+
+	/* extract the principal's authentication domain */
+	name = Z(REALM_SZ);
+	_debug("KIV REALM: %s", name);
+
+	if (end - p < 4 + 8 + 4 + 2)
+		goto bad_ticket;
+
+	/* get the IPv4 address of the entity that requested the ticket */
+	memcpy(&addr, p, sizeof(addr));
+	p += 4;
+	_debug("KIV ADDR : "NIPQUAD_FMT, NIPQUAD(addr));
+
+	/* get the session key from the ticket */
+	memcpy(&key, p, sizeof(key));
+	p += 8;
+	_debug("KIV KEY  : %08x %08x", ntohl(key.n[0]), ntohl(key.n[1]));
+	memcpy(_session_key, &key, sizeof(key));
+
+	/* get the ticket's lifetime */
+	life = *p++ * 5 * 60;
+	_debug("KIV LIFE : %u", life);
+
+	/* get the issue time of the ticket */
+	if (little_endian) {
+		__le32 stamp;
+		memcpy(&stamp, p, 4);
+		issue = le32_to_cpu(stamp);
+	} else {
+		__be32 stamp;
+		memcpy(&stamp, p, 4);
+		issue = be32_to_cpu(stamp);
+	}
+	p += 4;
+	now = xtime.tv_sec;
+	_debug("KIV ISSUE: %lx [%lx]", issue, now);
+
+	/* check the ticket is in date */
+	if (issue > now) {
+		*_abort_code = RXKADNOAUTH;
+		ret = -EKEYREJECTED;
+		goto error;
+	}
+
+	if (issue < now - life) {
+		*_abort_code = RXKADEXPIRED;
+		ret = -EKEYEXPIRED;
+		goto error;
+	}
+
+	*_expiry = issue + life;
+
+	/* get the service name */
+	name = Z(SNAME_SZ);
+	_debug("KIV SNAME: %s", name);
+
+	/* get the service instance name */
+	name = Z(INST_SZ);
+	_debug("KIV SINST: %s", name);
+
+	ret = 0;
+error:
+	_leave(" = %d", ret);
+	return ret;
+
+bad_ticket:
+	*_abort_code = RXKADBADTICKET;
+	ret = -EBADMSG;
+	goto error;
+}
+
+/*
+ * decrypt the response packet
+ */
+static void rxkad_decrypt_response(struct rxrpc_connection *conn,
+				   struct rxkad_response *resp,
+				   const struct rxrpc_crypt *session_key)
+{
+	struct blkcipher_desc desc;
+	struct scatterlist ssg[2], dsg[2];
+	struct rxrpc_crypt iv;
+
+	_enter(",,%08x%08x",
+	       ntohl(session_key->n[0]), ntohl(session_key->n[1]));
+
+	ASSERT(rxkad_ci != NULL);
+
+	mutex_lock(&rxkad_ci_mutex);
+	if (crypto_blkcipher_setkey(rxkad_ci, session_key->x,
+				    sizeof(*session_key)) < 0)
+		BUG();
+
+	memcpy(&iv, session_key, sizeof(iv));
+	desc.tfm = rxkad_ci;
+	desc.info = iv.x;
+	desc.flags = 0;
+
+	rxkad_sg_set_buf2(ssg, &resp->encrypted, sizeof(resp->encrypted));
+	memcpy(dsg, ssg, sizeof(dsg));
+	crypto_blkcipher_decrypt_iv(&desc, dsg, ssg, sizeof(resp->encrypted));
+	mutex_unlock(&rxkad_ci_mutex);
+
+	_leave("");
+}
+
+/*
+ * verify a response
+ */
+static int rxkad_verify_response(struct rxrpc_connection *conn,
+				 struct sk_buff *skb,
+				 u32 *_abort_code)
+{
+	struct rxkad_response response
+		__attribute__((aligned(8))); /* must be aligned for crypto */
+	struct rxrpc_skb_priv *sp;
+	struct rxrpc_crypt session_key;
+	time_t expiry;
+	void *ticket;
+	u32 abort_code, version, kvno, ticket_len, csum, level;
+	int ret;
+
+	_enter("{%d,%x}", conn->debug_id, key_serial(conn->server_key));
+
+	abort_code = RXKADPACKETSHORT;
+	if (skb_copy_bits(skb, 0, &response, sizeof(response)) < 0)
+		goto protocol_error;
+	if (!pskb_pull(skb, sizeof(response)))
+		BUG();
+
+	version = ntohl(response.version);
+	ticket_len = ntohl(response.ticket_len);
+	kvno = ntohl(response.kvno);
+	sp = rxrpc_skb(skb);
+	_proto("Rx RESPONSE %%%u { v=%u kv=%u tl=%u }",
+	       ntohl(sp->hdr.serial), version, kvno, ticket_len);
+
+	abort_code = RXKADINCONSISTENCY;
+	if (version != RXKAD_VERSION)
+
+	abort_code = RXKADTICKETLEN;
+	if (ticket_len < 4 || ticket_len > MAXKRB5TICKETLEN)
+		goto protocol_error;
+
+	abort_code = RXKADUNKNOWNKEY;
+	if (kvno >= RXKAD_TKT_TYPE_KERBEROS_V5)
+		goto protocol_error;
+
+	/* extract the kerberos ticket and decrypt and decode it */
+	ticket = kmalloc(ticket_len, GFP_NOFS);
+	if (!ticket)
+		return -ENOMEM;
+
+	abort_code = RXKADPACKETSHORT;
+	if (skb_copy_bits(skb, 0, ticket, ticket_len) < 0)
+		goto protocol_error_free;
+
+	ret = rxkad_decrypt_ticket(conn, ticket, ticket_len, &session_key,
+				   &expiry, &abort_code);
+	if (ret < 0) {
+		*_abort_code = abort_code;
+		kfree(ticket);
+		return ret;
+	}
+
+	/* use the session key from inside the ticket to decrypt the
+	 * response */
+	rxkad_decrypt_response(conn, &response, &session_key);
+
+	abort_code = RXKADSEALEDINCON;
+	if (response.encrypted.epoch != conn->epoch)
+		goto protocol_error_free;
+	if (response.encrypted.cid != conn->cid)
+		goto protocol_error_free;
+	if (ntohl(response.encrypted.securityIndex) != conn->security_ix)
+		goto protocol_error_free;
+	csum = response.encrypted.checksum;
+	response.encrypted.checksum = 0;
+	rxkad_calc_response_checksum(&response);
+	if (response.encrypted.checksum != csum)
+		goto protocol_error_free;
+
+	if (ntohl(response.encrypted.call_id[0]) > INT_MAX ||
+	    ntohl(response.encrypted.call_id[1]) > INT_MAX ||
+	    ntohl(response.encrypted.call_id[2]) > INT_MAX ||
+	    ntohl(response.encrypted.call_id[3]) > INT_MAX)
+		goto protocol_error_free;
+
+	abort_code = RXKADOUTOFSEQUENCE;
+	if (response.encrypted.inc_nonce != htonl(conn->security_nonce + 1))
+		goto protocol_error_free;
+
+	abort_code = RXKADLEVELFAIL;
+	level = ntohl(response.encrypted.level);
+	if (level > RXRPC_SECURITY_ENCRYPT)
+		goto protocol_error_free;
+	conn->security_level = level;
+
+	/* create a key to hold the security data and expiration time - after
+	 * this the connection security can be handled in exactly the same way
+	 * as for a client connection */
+	ret = rxrpc_get_server_data_key(conn, &session_key, expiry, kvno);
+	if (ret < 0) {
+		kfree(ticket);
+		return ret;
+	}
+
+	kfree(ticket);
+	_leave(" = 0");
+	return 0;
+
+protocol_error_free:
+	kfree(ticket);
+protocol_error:
+	*_abort_code = abort_code;
+	_leave(" = -EPROTO [%d]", abort_code);
+	return -EPROTO;
+}
+
+/*
+ * clear the connection security
+ */
+static void rxkad_clear(struct rxrpc_connection *conn)
+{
+	_enter("");
+
+	if (conn->cipher)
+		crypto_free_blkcipher(conn->cipher);
+}
+
+/*
+ * RxRPC Kerberos-based security
+ */
+static struct rxrpc_security rxkad = {
+	.owner				= THIS_MODULE,
+	.name				= "rxkad",
+	.security_index			= RXKAD_VERSION,
+	.init_connection_security	= rxkad_init_connection_security,
+	.prime_packet_security		= rxkad_prime_packet_security,
+	.secure_packet			= rxkad_secure_packet,
+	.verify_packet			= rxkad_verify_packet,
+	.issue_challenge		= rxkad_issue_challenge,
+	.respond_to_challenge		= rxkad_respond_to_challenge,
+	.verify_response		= rxkad_verify_response,
+	.clear				= rxkad_clear,
+};
+
+static __init int rxkad_init(void)
+{
+	_enter("");
+
+	/* pin the cipher we need so that the crypto layer doesn't invoke
+	 * keventd to go get it */
+	rxkad_ci = crypto_alloc_blkcipher("pcbc(fcrypt)", 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(rxkad_ci))
+		return PTR_ERR(rxkad_ci);
+
+	return rxrpc_register_security(&rxkad);
+}
+
+module_init(rxkad_init);
+
+static __exit void rxkad_exit(void)
+{
+	_enter("");
+
+	rxrpc_unregister_security(&rxkad);
+	crypto_free_blkcipher(rxkad_ci);
+}
+
+module_exit(rxkad_exit);