| /* SCTP kernel reference Implementation |
| * (C) Copyright IBM Corp. 2001, 2004 |
| * Copyright (c) 1999-2000 Cisco, Inc. |
| * Copyright (c) 1999-2001 Motorola, Inc. |
| * Copyright (c) 2001 Intel Corp. |
| * Copyright (c) 2001 Nokia, Inc. |
| * Copyright (c) 2001 La Monte H.P. Yarroll |
| * |
| * These functions manipulate an sctp event. The struct ulpevent is used |
| * to carry notifications and data to the ULP (sockets). |
| * The SCTP reference implementation 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, or (at your option) |
| * any later version. |
| * |
| * The SCTP reference implementation is distributed in the hope that it |
| * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| * ************************ |
| * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * See the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with GNU CC; see the file COPYING. If not, write to |
| * the Free Software Foundation, 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| * |
| * Please send any bug reports or fixes you make to the |
| * email address(es): |
| * lksctp developers <lksctp-developers@lists.sourceforge.net> |
| * |
| * Or submit a bug report through the following website: |
| * http://www.sf.net/projects/lksctp |
| * |
| * Written or modified by: |
| * Jon Grimm <jgrimm@us.ibm.com> |
| * La Monte H.P. Yarroll <piggy@acm.org> |
| * Ardelle Fan <ardelle.fan@intel.com> |
| * Sridhar Samudrala <sri@us.ibm.com> |
| * |
| * Any bugs reported given to us we will try to fix... any fixes shared will |
| * be incorporated into the next SCTP release. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/skbuff.h> |
| #include <net/sctp/structs.h> |
| #include <net/sctp/sctp.h> |
| #include <net/sctp/sm.h> |
| |
| static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, |
| struct sctp_association *asoc); |
| static void sctp_ulpevent_release_data(struct sctp_ulpevent *event); |
| |
| /* Stub skb destructor. */ |
| static void sctp_stub_rfree(struct sk_buff *skb) |
| { |
| /* WARNING: This function is just a warning not to use the |
| * skb destructor. If the skb is shared, we may get the destructor |
| * callback on some processor that does not own the sock_lock. This |
| * was occuring with PACKET socket applications that were monitoring |
| * our skbs. We can't take the sock_lock, because we can't risk |
| * recursing if we do really own the sock lock. Instead, do all |
| * of our rwnd manipulation while we own the sock_lock outright. |
| */ |
| } |
| |
| /* Initialize an ULP event from an given skb. */ |
| SCTP_STATIC void sctp_ulpevent_init(struct sctp_ulpevent *event, int msg_flags) |
| { |
| memset(event, 0, sizeof(struct sctp_ulpevent)); |
| event->msg_flags = msg_flags; |
| } |
| |
| /* Create a new sctp_ulpevent. */ |
| SCTP_STATIC struct sctp_ulpevent *sctp_ulpevent_new(int size, int msg_flags, |
| int gfp) |
| { |
| struct sctp_ulpevent *event; |
| struct sk_buff *skb; |
| |
| skb = alloc_skb(size, gfp); |
| if (!skb) |
| goto fail; |
| |
| event = sctp_skb2event(skb); |
| sctp_ulpevent_init(event, msg_flags); |
| |
| return event; |
| |
| fail: |
| return NULL; |
| } |
| |
| /* Is this a MSG_NOTIFICATION? */ |
| int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event) |
| { |
| return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION); |
| } |
| |
| /* Hold the association in case the msg_name needs read out of |
| * the association. |
| */ |
| static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event, |
| const struct sctp_association *asoc) |
| { |
| struct sk_buff *skb; |
| |
| /* Cast away the const, as we are just wanting to |
| * bump the reference count. |
| */ |
| sctp_association_hold((struct sctp_association *)asoc); |
| skb = sctp_event2skb(event); |
| skb->sk = asoc->base.sk; |
| event->asoc = (struct sctp_association *)asoc; |
| skb->destructor = sctp_stub_rfree; |
| } |
| |
| /* A simple destructor to give up the reference to the association. */ |
| static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event) |
| { |
| sctp_association_put(event->asoc); |
| } |
| |
| /* Create and initialize an SCTP_ASSOC_CHANGE event. |
| * |
| * 5.3.1.1 SCTP_ASSOC_CHANGE |
| * |
| * Communication notifications inform the ULP that an SCTP association |
| * has either begun or ended. The identifier for a new association is |
| * provided by this notification. |
| * |
| * Note: There is no field checking here. If a field is unused it will be |
| * zero'd out. |
| */ |
| struct sctp_ulpevent *sctp_ulpevent_make_assoc_change( |
| const struct sctp_association *asoc, |
| __u16 flags, __u16 state, __u16 error, __u16 outbound, |
| __u16 inbound, int gfp) |
| { |
| struct sctp_ulpevent *event; |
| struct sctp_assoc_change *sac; |
| struct sk_buff *skb; |
| |
| event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change), |
| MSG_NOTIFICATION, gfp); |
| if (!event) |
| goto fail; |
| skb = sctp_event2skb(event); |
| sac = (struct sctp_assoc_change *) |
| skb_put(skb, sizeof(struct sctp_assoc_change)); |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.1 SCTP_ASSOC_CHANGE |
| * |
| * sac_type: |
| * It should be SCTP_ASSOC_CHANGE. |
| */ |
| sac->sac_type = SCTP_ASSOC_CHANGE; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.1 SCTP_ASSOC_CHANGE |
| * |
| * sac_state: 32 bits (signed integer) |
| * This field holds one of a number of values that communicate the |
| * event that happened to the association. |
| */ |
| sac->sac_state = state; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.1 SCTP_ASSOC_CHANGE |
| * |
| * sac_flags: 16 bits (unsigned integer) |
| * Currently unused. |
| */ |
| sac->sac_flags = 0; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.1 SCTP_ASSOC_CHANGE |
| * |
| * sac_length: sizeof (__u32) |
| * This field is the total length of the notification data, including |
| * the notification header. |
| */ |
| sac->sac_length = sizeof(struct sctp_assoc_change); |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.1 SCTP_ASSOC_CHANGE |
| * |
| * sac_error: 32 bits (signed integer) |
| * |
| * If the state was reached due to a error condition (e.g. |
| * COMMUNICATION_LOST) any relevant error information is available in |
| * this field. This corresponds to the protocol error codes defined in |
| * [SCTP]. |
| */ |
| sac->sac_error = error; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.1 SCTP_ASSOC_CHANGE |
| * |
| * sac_outbound_streams: 16 bits (unsigned integer) |
| * sac_inbound_streams: 16 bits (unsigned integer) |
| * |
| * The maximum number of streams allowed in each direction are |
| * available in sac_outbound_streams and sac_inbound streams. |
| */ |
| sac->sac_outbound_streams = outbound; |
| sac->sac_inbound_streams = inbound; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.1 SCTP_ASSOC_CHANGE |
| * |
| * sac_assoc_id: sizeof (sctp_assoc_t) |
| * |
| * The association id field, holds the identifier for the association. |
| * All notifications for a given association have the same association |
| * identifier. For TCP style socket, this field is ignored. |
| */ |
| sctp_ulpevent_set_owner(event, asoc); |
| sac->sac_assoc_id = sctp_assoc2id(asoc); |
| |
| return event; |
| |
| fail: |
| return NULL; |
| } |
| |
| /* Create and initialize an SCTP_PEER_ADDR_CHANGE event. |
| * |
| * Socket Extensions for SCTP - draft-01 |
| * 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| * |
| * When a destination address on a multi-homed peer encounters a change |
| * an interface details event is sent. |
| */ |
| struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change( |
| const struct sctp_association *asoc, |
| const struct sockaddr_storage *aaddr, |
| int flags, int state, int error, int gfp) |
| { |
| struct sctp_ulpevent *event; |
| struct sctp_paddr_change *spc; |
| struct sk_buff *skb; |
| |
| event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change), |
| MSG_NOTIFICATION, gfp); |
| if (!event) |
| goto fail; |
| |
| skb = sctp_event2skb(event); |
| spc = (struct sctp_paddr_change *) |
| skb_put(skb, sizeof(struct sctp_paddr_change)); |
| |
| /* Sockets API Extensions for SCTP |
| * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| * |
| * spc_type: |
| * |
| * It should be SCTP_PEER_ADDR_CHANGE. |
| */ |
| spc->spc_type = SCTP_PEER_ADDR_CHANGE; |
| |
| /* Sockets API Extensions for SCTP |
| * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| * |
| * spc_length: sizeof (__u32) |
| * |
| * This field is the total length of the notification data, including |
| * the notification header. |
| */ |
| spc->spc_length = sizeof(struct sctp_paddr_change); |
| |
| /* Sockets API Extensions for SCTP |
| * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| * |
| * spc_flags: 16 bits (unsigned integer) |
| * Currently unused. |
| */ |
| spc->spc_flags = 0; |
| |
| /* Sockets API Extensions for SCTP |
| * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| * |
| * spc_state: 32 bits (signed integer) |
| * |
| * This field holds one of a number of values that communicate the |
| * event that happened to the address. |
| */ |
| spc->spc_state = state; |
| |
| /* Sockets API Extensions for SCTP |
| * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| * |
| * spc_error: 32 bits (signed integer) |
| * |
| * If the state was reached due to any error condition (e.g. |
| * ADDRESS_UNREACHABLE) any relevant error information is available in |
| * this field. |
| */ |
| spc->spc_error = error; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.1 SCTP_ASSOC_CHANGE |
| * |
| * spc_assoc_id: sizeof (sctp_assoc_t) |
| * |
| * The association id field, holds the identifier for the association. |
| * All notifications for a given association have the same association |
| * identifier. For TCP style socket, this field is ignored. |
| */ |
| sctp_ulpevent_set_owner(event, asoc); |
| spc->spc_assoc_id = sctp_assoc2id(asoc); |
| |
| /* Sockets API Extensions for SCTP |
| * Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE |
| * |
| * spc_aaddr: sizeof (struct sockaddr_storage) |
| * |
| * The affected address field, holds the remote peer's address that is |
| * encountering the change of state. |
| */ |
| memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage)); |
| |
| /* Map ipv4 address into v4-mapped-on-v6 address. */ |
| sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_v4map( |
| sctp_sk(asoc->base.sk), |
| (union sctp_addr *)&spc->spc_aaddr); |
| |
| return event; |
| |
| fail: |
| return NULL; |
| } |
| |
| /* Create and initialize an SCTP_REMOTE_ERROR notification. |
| * |
| * Note: This assumes that the chunk->skb->data already points to the |
| * operation error payload. |
| * |
| * Socket Extensions for SCTP - draft-01 |
| * 5.3.1.3 SCTP_REMOTE_ERROR |
| * |
| * A remote peer may send an Operational Error message to its peer. |
| * This message indicates a variety of error conditions on an |
| * association. The entire error TLV as it appears on the wire is |
| * included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP |
| * specification [SCTP] and any extensions for a list of possible |
| * error formats. |
| */ |
| struct sctp_ulpevent *sctp_ulpevent_make_remote_error( |
| const struct sctp_association *asoc, struct sctp_chunk *chunk, |
| __u16 flags, int gfp) |
| { |
| struct sctp_ulpevent *event; |
| struct sctp_remote_error *sre; |
| struct sk_buff *skb; |
| sctp_errhdr_t *ch; |
| __u16 cause; |
| int elen; |
| |
| ch = (sctp_errhdr_t *)(chunk->skb->data); |
| cause = ch->cause; |
| elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t); |
| |
| /* Pull off the ERROR header. */ |
| skb_pull(chunk->skb, sizeof(sctp_errhdr_t)); |
| |
| /* Copy the skb to a new skb with room for us to prepend |
| * notification with. |
| */ |
| skb = skb_copy_expand(chunk->skb, sizeof(struct sctp_remote_error), |
| 0, gfp); |
| |
| /* Pull off the rest of the cause TLV from the chunk. */ |
| skb_pull(chunk->skb, elen); |
| if (!skb) |
| goto fail; |
| |
| /* Embed the event fields inside the cloned skb. */ |
| event = sctp_skb2event(skb); |
| sctp_ulpevent_init(event, MSG_NOTIFICATION); |
| |
| sre = (struct sctp_remote_error *) |
| skb_push(skb, sizeof(struct sctp_remote_error)); |
| |
| /* Trim the buffer to the right length. */ |
| skb_trim(skb, sizeof(struct sctp_remote_error) + elen); |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.3 SCTP_REMOTE_ERROR |
| * |
| * sre_type: |
| * It should be SCTP_REMOTE_ERROR. |
| */ |
| sre->sre_type = SCTP_REMOTE_ERROR; |
| |
| /* |
| * Socket Extensions for SCTP |
| * 5.3.1.3 SCTP_REMOTE_ERROR |
| * |
| * sre_flags: 16 bits (unsigned integer) |
| * Currently unused. |
| */ |
| sre->sre_flags = 0; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.3 SCTP_REMOTE_ERROR |
| * |
| * sre_length: sizeof (__u32) |
| * |
| * This field is the total length of the notification data, |
| * including the notification header. |
| */ |
| sre->sre_length = skb->len; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.3 SCTP_REMOTE_ERROR |
| * |
| * sre_error: 16 bits (unsigned integer) |
| * This value represents one of the Operational Error causes defined in |
| * the SCTP specification, in network byte order. |
| */ |
| sre->sre_error = cause; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.3 SCTP_REMOTE_ERROR |
| * |
| * sre_assoc_id: sizeof (sctp_assoc_t) |
| * |
| * The association id field, holds the identifier for the association. |
| * All notifications for a given association have the same association |
| * identifier. For TCP style socket, this field is ignored. |
| */ |
| sctp_ulpevent_set_owner(event, asoc); |
| sre->sre_assoc_id = sctp_assoc2id(asoc); |
| |
| return event; |
| |
| fail: |
| return NULL; |
| } |
| |
| /* Create and initialize a SCTP_SEND_FAILED notification. |
| * |
| * Socket Extensions for SCTP - draft-01 |
| * 5.3.1.4 SCTP_SEND_FAILED |
| */ |
| struct sctp_ulpevent *sctp_ulpevent_make_send_failed( |
| const struct sctp_association *asoc, struct sctp_chunk *chunk, |
| __u16 flags, __u32 error, int gfp) |
| { |
| struct sctp_ulpevent *event; |
| struct sctp_send_failed *ssf; |
| struct sk_buff *skb; |
| |
| /* Pull off any padding. */ |
| int len = ntohs(chunk->chunk_hdr->length); |
| |
| /* Make skb with more room so we can prepend notification. */ |
| skb = skb_copy_expand(chunk->skb, |
| sizeof(struct sctp_send_failed), /* headroom */ |
| 0, /* tailroom */ |
| gfp); |
| if (!skb) |
| goto fail; |
| |
| /* Pull off the common chunk header and DATA header. */ |
| skb_pull(skb, sizeof(struct sctp_data_chunk)); |
| len -= sizeof(struct sctp_data_chunk); |
| |
| /* Embed the event fields inside the cloned skb. */ |
| event = sctp_skb2event(skb); |
| sctp_ulpevent_init(event, MSG_NOTIFICATION); |
| |
| ssf = (struct sctp_send_failed *) |
| skb_push(skb, sizeof(struct sctp_send_failed)); |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.4 SCTP_SEND_FAILED |
| * |
| * ssf_type: |
| * It should be SCTP_SEND_FAILED. |
| */ |
| ssf->ssf_type = SCTP_SEND_FAILED; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.4 SCTP_SEND_FAILED |
| * |
| * ssf_flags: 16 bits (unsigned integer) |
| * The flag value will take one of the following values |
| * |
| * SCTP_DATA_UNSENT - Indicates that the data was never put on |
| * the wire. |
| * |
| * SCTP_DATA_SENT - Indicates that the data was put on the wire. |
| * Note that this does not necessarily mean that the |
| * data was (or was not) successfully delivered. |
| */ |
| ssf->ssf_flags = flags; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.4 SCTP_SEND_FAILED |
| * |
| * ssf_length: sizeof (__u32) |
| * This field is the total length of the notification data, including |
| * the notification header. |
| */ |
| ssf->ssf_length = sizeof(struct sctp_send_failed) + len; |
| skb_trim(skb, ssf->ssf_length); |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.4 SCTP_SEND_FAILED |
| * |
| * ssf_error: 16 bits (unsigned integer) |
| * This value represents the reason why the send failed, and if set, |
| * will be a SCTP protocol error code as defined in [SCTP] section |
| * 3.3.10. |
| */ |
| ssf->ssf_error = error; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.4 SCTP_SEND_FAILED |
| * |
| * ssf_info: sizeof (struct sctp_sndrcvinfo) |
| * The original send information associated with the undelivered |
| * message. |
| */ |
| memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo)); |
| |
| /* Per TSVWG discussion with Randy. Allow the application to |
| * ressemble a fragmented message. |
| */ |
| ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.4 SCTP_SEND_FAILED |
| * |
| * ssf_assoc_id: sizeof (sctp_assoc_t) |
| * The association id field, sf_assoc_id, holds the identifier for the |
| * association. All notifications for a given association have the |
| * same association identifier. For TCP style socket, this field is |
| * ignored. |
| */ |
| sctp_ulpevent_set_owner(event, asoc); |
| ssf->ssf_assoc_id = sctp_assoc2id(asoc); |
| return event; |
| |
| fail: |
| return NULL; |
| } |
| |
| /* Create and initialize a SCTP_SHUTDOWN_EVENT notification. |
| * |
| * Socket Extensions for SCTP - draft-01 |
| * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| */ |
| struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event( |
| const struct sctp_association *asoc, |
| __u16 flags, int gfp) |
| { |
| struct sctp_ulpevent *event; |
| struct sctp_shutdown_event *sse; |
| struct sk_buff *skb; |
| |
| event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event), |
| MSG_NOTIFICATION, gfp); |
| if (!event) |
| goto fail; |
| |
| skb = sctp_event2skb(event); |
| sse = (struct sctp_shutdown_event *) |
| skb_put(skb, sizeof(struct sctp_shutdown_event)); |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| * |
| * sse_type |
| * It should be SCTP_SHUTDOWN_EVENT |
| */ |
| sse->sse_type = SCTP_SHUTDOWN_EVENT; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| * |
| * sse_flags: 16 bits (unsigned integer) |
| * Currently unused. |
| */ |
| sse->sse_flags = 0; |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| * |
| * sse_length: sizeof (__u32) |
| * This field is the total length of the notification data, including |
| * the notification header. |
| */ |
| sse->sse_length = sizeof(struct sctp_shutdown_event); |
| |
| /* Socket Extensions for SCTP |
| * 5.3.1.5 SCTP_SHUTDOWN_EVENT |
| * |
| * sse_assoc_id: sizeof (sctp_assoc_t) |
| * The association id field, holds the identifier for the association. |
| * All notifications for a given association have the same association |
| * identifier. For TCP style socket, this field is ignored. |
| */ |
| sctp_ulpevent_set_owner(event, asoc); |
| sse->sse_assoc_id = sctp_assoc2id(asoc); |
| |
| return event; |
| |
| fail: |
| return NULL; |
| } |
| |
| /* Create and initialize a SCTP_ADAPTION_INDICATION notification. |
| * |
| * Socket Extensions for SCTP |
| * 5.3.1.6 SCTP_ADAPTION_INDICATION |
| */ |
| struct sctp_ulpevent *sctp_ulpevent_make_adaption_indication( |
| const struct sctp_association *asoc, int gfp) |
| { |
| struct sctp_ulpevent *event; |
| struct sctp_adaption_event *sai; |
| struct sk_buff *skb; |
| |
| event = sctp_ulpevent_new(sizeof(struct sctp_adaption_event), |
| MSG_NOTIFICATION, gfp); |
| if (!event) |
| goto fail; |
| |
| skb = sctp_event2skb(event); |
| sai = (struct sctp_adaption_event *) |
| skb_put(skb, sizeof(struct sctp_adaption_event)); |
| |
| sai->sai_type = SCTP_ADAPTION_INDICATION; |
| sai->sai_flags = 0; |
| sai->sai_length = sizeof(struct sctp_adaption_event); |
| sai->sai_adaption_ind = asoc->peer.adaption_ind; |
| sctp_ulpevent_set_owner(event, asoc); |
| sai->sai_assoc_id = sctp_assoc2id(asoc); |
| |
| return event; |
| |
| fail: |
| return NULL; |
| } |
| |
| /* A message has been received. Package this message as a notification |
| * to pass it to the upper layers. Go ahead and calculate the sndrcvinfo |
| * even if filtered out later. |
| * |
| * Socket Extensions for SCTP |
| * 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) |
| */ |
| struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc, |
| struct sctp_chunk *chunk, |
| int gfp) |
| { |
| struct sctp_ulpevent *event = NULL; |
| struct sk_buff *skb; |
| size_t padding, len; |
| |
| /* Clone the original skb, sharing the data. */ |
| skb = skb_clone(chunk->skb, gfp); |
| if (!skb) |
| goto fail; |
| |
| /* First calculate the padding, so we don't inadvertently |
| * pass up the wrong length to the user. |
| * |
| * RFC 2960 - Section 3.2 Chunk Field Descriptions |
| * |
| * The total length of a chunk(including Type, Length and Value fields) |
| * MUST be a multiple of 4 bytes. If the length of the chunk is not a |
| * multiple of 4 bytes, the sender MUST pad the chunk with all zero |
| * bytes and this padding is not included in the chunk length field. |
| * The sender should never pad with more than 3 bytes. The receiver |
| * MUST ignore the padding bytes. |
| */ |
| len = ntohs(chunk->chunk_hdr->length); |
| padding = WORD_ROUND(len) - len; |
| |
| /* Fixup cloned skb with just this chunks data. */ |
| skb_trim(skb, chunk->chunk_end - padding - skb->data); |
| |
| /* Embed the event fields inside the cloned skb. */ |
| event = sctp_skb2event(skb); |
| |
| /* Initialize event with flags 0. */ |
| sctp_ulpevent_init(event, 0); |
| |
| sctp_ulpevent_receive_data(event, asoc); |
| |
| event->stream = ntohs(chunk->subh.data_hdr->stream); |
| event->ssn = ntohs(chunk->subh.data_hdr->ssn); |
| event->ppid = chunk->subh.data_hdr->ppid; |
| if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) { |
| event->flags |= MSG_UNORDERED; |
| event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
| } |
| event->tsn = ntohl(chunk->subh.data_hdr->tsn); |
| event->msg_flags |= chunk->chunk_hdr->flags; |
| event->iif = sctp_chunk_iif(chunk); |
| |
| fail: |
| return event; |
| } |
| |
| /* Create a partial delivery related event. |
| * |
| * 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT |
| * |
| * When a receiver is engaged in a partial delivery of a |
| * message this notification will be used to indicate |
| * various events. |
| */ |
| struct sctp_ulpevent *sctp_ulpevent_make_pdapi( |
| const struct sctp_association *asoc, __u32 indication, int gfp) |
| { |
| struct sctp_ulpevent *event; |
| struct sctp_pdapi_event *pd; |
| struct sk_buff *skb; |
| |
| event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event), |
| MSG_NOTIFICATION, gfp); |
| if (!event) |
| goto fail; |
| |
| skb = sctp_event2skb(event); |
| pd = (struct sctp_pdapi_event *) |
| skb_put(skb, sizeof(struct sctp_pdapi_event)); |
| |
| /* pdapi_type |
| * It should be SCTP_PARTIAL_DELIVERY_EVENT |
| * |
| * pdapi_flags: 16 bits (unsigned integer) |
| * Currently unused. |
| */ |
| pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT; |
| pd->pdapi_flags = 0; |
| |
| /* pdapi_length: 32 bits (unsigned integer) |
| * |
| * This field is the total length of the notification data, including |
| * the notification header. It will generally be sizeof (struct |
| * sctp_pdapi_event). |
| */ |
| pd->pdapi_length = sizeof(struct sctp_pdapi_event); |
| |
| /* pdapi_indication: 32 bits (unsigned integer) |
| * |
| * This field holds the indication being sent to the application. |
| */ |
| pd->pdapi_indication = indication; |
| |
| /* pdapi_assoc_id: sizeof (sctp_assoc_t) |
| * |
| * The association id field, holds the identifier for the association. |
| */ |
| sctp_ulpevent_set_owner(event, asoc); |
| pd->pdapi_assoc_id = sctp_assoc2id(asoc); |
| |
| return event; |
| fail: |
| return NULL; |
| } |
| |
| /* Return the notification type, assuming this is a notification |
| * event. |
| */ |
| __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event) |
| { |
| union sctp_notification *notification; |
| struct sk_buff *skb; |
| |
| skb = sctp_event2skb((struct sctp_ulpevent *)event); |
| notification = (union sctp_notification *) skb->data; |
| return notification->sn_header.sn_type; |
| } |
| |
| /* Copy out the sndrcvinfo into a msghdr. */ |
| void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event, |
| struct msghdr *msghdr) |
| { |
| struct sctp_sndrcvinfo sinfo; |
| |
| if (sctp_ulpevent_is_notification(event)) |
| return; |
| |
| /* Sockets API Extensions for SCTP |
| * Section 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV) |
| * |
| * sinfo_stream: 16 bits (unsigned integer) |
| * |
| * For recvmsg() the SCTP stack places the message's stream number in |
| * this value. |
| */ |
| sinfo.sinfo_stream = event->stream; |
| /* sinfo_ssn: 16 bits (unsigned integer) |
| * |
| * For recvmsg() this value contains the stream sequence number that |
| * the remote endpoint placed in the DATA chunk. For fragmented |
| * messages this is the same number for all deliveries of the message |
| * (if more than one recvmsg() is needed to read the message). |
| */ |
| sinfo.sinfo_ssn = event->ssn; |
| /* sinfo_ppid: 32 bits (unsigned integer) |
| * |
| * In recvmsg() this value is |
| * the same information that was passed by the upper layer in the peer |
| * application. Please note that byte order issues are NOT accounted |
| * for and this information is passed opaquely by the SCTP stack from |
| * one end to the other. |
| */ |
| sinfo.sinfo_ppid = event->ppid; |
| /* sinfo_flags: 16 bits (unsigned integer) |
| * |
| * This field may contain any of the following flags and is composed of |
| * a bitwise OR of these values. |
| * |
| * recvmsg() flags: |
| * |
| * MSG_UNORDERED - This flag is present when the message was sent |
| * non-ordered. |
| */ |
| sinfo.sinfo_flags = event->flags; |
| /* sinfo_tsn: 32 bit (unsigned integer) |
| * |
| * For the receiving side, this field holds a TSN that was |
| * assigned to one of the SCTP Data Chunks. |
| */ |
| sinfo.sinfo_tsn = event->tsn; |
| /* sinfo_cumtsn: 32 bit (unsigned integer) |
| * |
| * This field will hold the current cumulative TSN as |
| * known by the underlying SCTP layer. Note this field is |
| * ignored when sending and only valid for a receive |
| * operation when sinfo_flags are set to MSG_UNORDERED. |
| */ |
| sinfo.sinfo_cumtsn = event->cumtsn; |
| /* sinfo_assoc_id: sizeof (sctp_assoc_t) |
| * |
| * The association handle field, sinfo_assoc_id, holds the identifier |
| * for the association announced in the COMMUNICATION_UP notification. |
| * All notifications for a given association have the same identifier. |
| * Ignored for one-to-one style sockets. |
| */ |
| sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc); |
| |
| /* These fields are not used while receiving. */ |
| sinfo.sinfo_context = 0; |
| sinfo.sinfo_timetolive = 0; |
| |
| put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV, |
| sizeof(struct sctp_sndrcvinfo), (void *)&sinfo); |
| } |
| |
| /* Do accounting for bytes received and hold a reference to the association |
| * for each skb. |
| */ |
| static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event, |
| struct sctp_association *asoc) |
| { |
| struct sk_buff *skb, *frag; |
| |
| skb = sctp_event2skb(event); |
| /* Set the owner and charge rwnd for bytes received. */ |
| sctp_ulpevent_set_owner(event, asoc); |
| sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb)); |
| |
| if (!skb->data_len) |
| return; |
| |
| /* Note: Not clearing the entire event struct as this is just a |
| * fragment of the real event. However, we still need to do rwnd |
| * accounting. |
| * In general, the skb passed from IP can have only 1 level of |
| * fragments. But we allow multiple levels of fragments. |
| */ |
| for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) { |
| sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc); |
| } |
| } |
| |
| /* Do accounting for bytes just read by user and release the references to |
| * the association. |
| */ |
| static void sctp_ulpevent_release_data(struct sctp_ulpevent *event) |
| { |
| struct sk_buff *skb, *frag; |
| |
| /* Current stack structures assume that the rcv buffer is |
| * per socket. For UDP style sockets this is not true as |
| * multiple associations may be on a single UDP-style socket. |
| * Use the local private area of the skb to track the owning |
| * association. |
| */ |
| |
| skb = sctp_event2skb(event); |
| sctp_assoc_rwnd_increase(event->asoc, skb_headlen(skb)); |
| |
| if (!skb->data_len) |
| goto done; |
| |
| /* Don't forget the fragments. */ |
| for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) { |
| /* NOTE: skb_shinfos are recursive. Although IP returns |
| * skb's with only 1 level of fragments, SCTP reassembly can |
| * increase the levels. |
| */ |
| sctp_ulpevent_release_data(sctp_skb2event(frag)); |
| } |
| |
| done: |
| sctp_ulpevent_release_owner(event); |
| } |
| |
| /* Free a ulpevent that has an owner. It includes releasing the reference |
| * to the owner, updating the rwnd in case of a DATA event and freeing the |
| * skb. |
| * See comments in sctp_stub_rfree(). |
| */ |
| void sctp_ulpevent_free(struct sctp_ulpevent *event) |
| { |
| if (sctp_ulpevent_is_notification(event)) |
| sctp_ulpevent_release_owner(event); |
| else |
| sctp_ulpevent_release_data(event); |
| |
| kfree_skb(sctp_event2skb(event)); |
| } |
| |
| /* Purge the skb lists holding ulpevents. */ |
| void sctp_queue_purge_ulpevents(struct sk_buff_head *list) |
| { |
| struct sk_buff *skb; |
| while ((skb = skb_dequeue(list)) != NULL) |
| sctp_ulpevent_free(sctp_skb2event(skb)); |
| } |