Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/net/irda/irnet/Kconfig b/net/irda/irnet/Kconfig
new file mode 100644
index 0000000..28c557f
--- /dev/null
+++ b/net/irda/irnet/Kconfig
@@ -0,0 +1,13 @@
+config IRNET
+ tristate "IrNET protocol"
+ depends on IRDA && PPP
+ help
+ Say Y here if you want to build support for the IrNET protocol.
+ To compile it as a module, choose M here: the module will be
+ called irnet. IrNET is a PPP driver, so you will also need a
+ working PPP subsystem (driver, daemon and config)...
+
+ IrNET is an alternate way to transfer TCP/IP traffic over IrDA. It
+ uses synchronous PPP over a set of point to point IrDA sockets. You
+ can use it between Linux machine or with W2k.
+
diff --git a/net/irda/irnet/Makefile b/net/irda/irnet/Makefile
new file mode 100644
index 0000000..b3ee01e
--- /dev/null
+++ b/net/irda/irnet/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the Linux IrDA IrNET protocol layer.
+#
+
+obj-$(CONFIG_IRNET) += irnet.o
+
+irnet-objs := irnet_ppp.o irnet_irda.o
diff --git a/net/irda/irnet/irnet.h b/net/irda/irnet/irnet.h
new file mode 100644
index 0000000..9004f73
--- /dev/null
+++ b/net/irda/irnet/irnet.h
@@ -0,0 +1,529 @@
+/*
+ * IrNET protocol module : Synchronous PPP over an IrDA socket.
+ *
+ * Jean II - HPL `00 - <jt@hpl.hp.com>
+ *
+ * This file contains definitions and declarations global to the IrNET module,
+ * all grouped in one place...
+ * This file is a *private* header, so other modules don't want to know
+ * what's in there...
+ *
+ * Note : as most part of the Linux kernel, this module is available
+ * under the GNU General Public License (GPL).
+ */
+
+#ifndef IRNET_H
+#define IRNET_H
+
+/************************** DOCUMENTATION ***************************/
+/*
+ * What is IrNET
+ * -------------
+ * IrNET is a protocol allowing to carry TCP/IP traffic between two
+ * IrDA peers in an efficient fashion. It is a thin layer, passing PPP
+ * packets to IrTTP and vice versa. It uses PPP in synchronous mode,
+ * because IrTTP offer a reliable sequenced packet service (as opposed
+ * to a byte stream). In fact, you could see IrNET as carrying TCP/IP
+ * in a IrDA socket, using PPP to provide the glue.
+ *
+ * The main difference with traditional PPP over IrCOMM is that we
+ * avoid the framing and serial emulation which are a performance
+ * bottleneck. It also allows multipoint communications in a sensible
+ * fashion.
+ *
+ * The main difference with IrLAN is that we use PPP for the link
+ * management, which is more standard, interoperable and flexible than
+ * the IrLAN protocol. For example, PPP adds authentication,
+ * encryption, compression, header compression and automated routing
+ * setup. And, as IrNET let PPP do the hard work, the implementation
+ * is much simpler than IrLAN.
+ *
+ * The Linux implementation
+ * ------------------------
+ * IrNET is written on top of the Linux-IrDA stack, and interface with
+ * the generic Linux PPP driver. Because IrNET depend on recent
+ * changes of the PPP driver interface, IrNET will work only with very
+ * recent kernel (2.3.99-pre6 and up).
+ *
+ * The present implementation offer the following features :
+ * o simple user interface using pppd
+ * o efficient implementation (interface directly to PPP and IrTTP)
+ * o addressing (you can specify the name of the IrNET recipient)
+ * o multipoint operation (limited by IrLAP specification)
+ * o information in /proc/net/irda/irnet
+ * o IrNET events on /dev/irnet (for user space daemon)
+ * o IrNET daemon (irnetd) to automatically handle incoming requests
+ * o Windows 2000 compatibility (tested, but need more work)
+ * Currently missing :
+ * o Lot's of testing (that's your job)
+ * o Connection retries (may be too hard to do)
+ * o Check pppd persist mode
+ * o User space daemon (to automatically handle incoming requests)
+ *
+ * The setup is not currently the most easy, but this should get much
+ * better when everything will get integrated...
+ *
+ * Acknowledgements
+ * ----------------
+ * This module is based on :
+ * o The PPP driver (ppp_synctty/ppp_generic) by Paul Mackerras
+ * o The IrLAN protocol (irlan_common/XXX) by Dag Brattli
+ * o The IrSock interface (af_irda) by Dag Brattli
+ * o Some other bits from the kernel and my drivers...
+ * Infinite thanks to those brave souls for providing the infrastructure
+ * upon which IrNET is built.
+ *
+ * Thanks to all my collegues in HP for helping me. In particular,
+ * thanks to Salil Pradhan and Bill Serra for W2k testing...
+ * Thanks to Luiz Magalhaes for irnetd and much testing...
+ *
+ * Thanks to Alan Cox for answering lot's of my stupid questions, and
+ * to Paul Mackerras answering my questions on how to best integrate
+ * IrNET and pppd.
+ *
+ * Jean II
+ *
+ * Note on some implementations choices...
+ * ------------------------------------
+ * 1) Direct interface vs tty/socket
+ * I could have used a tty interface to hook to ppp and use the full
+ * socket API to connect to IrDA. The code would have been easier to
+ * maintain, and maybe the code would have been smaller...
+ * Instead, we hook directly to ppp_generic and to IrTTP, which make
+ * things more complicated...
+ *
+ * The first reason is flexibility : this allow us to create IrNET
+ * instances on demand (no /dev/ircommX crap) and to allow linkname
+ * specification on pppd command line...
+ *
+ * Second reason is speed optimisation. If you look closely at the
+ * transmit and receive paths, you will notice that they are "super lean"
+ * (that's why they look ugly), with no function calls and as little data
+ * copy and modification as I could...
+ *
+ * 2) irnetd in user space
+ * irnetd is implemented in user space, which is necessary to call pppd.
+ * This also give maximum benefits in term of flexibility and customability,
+ * and allow to offer the event channel, useful for other stuff like debug.
+ *
+ * On the other hand, this require a loose coordination between the
+ * present module and irnetd. One critical area is how incoming request
+ * are handled.
+ * When irnet receive an incoming request, it send an event to irnetd and
+ * drop the incoming IrNET socket.
+ * irnetd start a pppd instance, which create a new IrNET socket. This new
+ * socket is then connected in the originating node to the pppd instance.
+ * At this point, in the originating node, the first socket is closed.
+ *
+ * I admit, this is a bit messy and waste some resources. The alternative
+ * is caching incoming socket, and that's also quite messy and waste
+ * resources.
+ * We also make connection time slower. For example, on a 115 kb/s link it
+ * adds 60ms to the connection time (770 ms). However, this is slower than
+ * the time it takes to fire up pppd on my P133...
+ *
+ *
+ * History :
+ * -------
+ *
+ * v1 - 15.5.00 - Jean II
+ * o Basic IrNET (hook to ppp_generic & IrTTP - incl. multipoint)
+ * o control channel on /dev/irnet (set name/address)
+ * o event channel on /dev/irnet (for user space daemon)
+ *
+ * v2 - 5.6.00 - Jean II
+ * o Enable DROP_NOT_READY to avoid PPP timeouts & other weirdness...
+ * o Add DISCONNECT_TO event and rename DISCONNECT_FROM.
+ * o Set official device number alloaction on /dev/irnet
+ *
+ * v3 - 30.8.00 - Jean II
+ * o Update to latest Linux-IrDA changes :
+ * - queue_t => irda_queue_t
+ * o Update to ppp-2.4.0 :
+ * - move irda_irnet_connect from PPPIOCATTACH to TIOCSETD
+ * o Add EXPIRE event (depend on new IrDA-Linux patch)
+ * o Switch from `hashbin_remove' to `hashbin_remove_this' to fix
+ * a multilink bug... (depend on new IrDA-Linux patch)
+ * o fix a self->daddr to self->raddr in irda_irnet_connect to fix
+ * another multilink bug (darn !)
+ * o Remove LINKNAME_IOCTL cruft
+ *
+ * v3b - 31.8.00 - Jean II
+ * o Dump discovery log at event channel startup
+ *
+ * v4 - 28.9.00 - Jean II
+ * o Fix interaction between poll/select and dump discovery log
+ * o Add IRNET_BLOCKED_LINK event (depend on new IrDA-Linux patch)
+ * o Add IRNET_NOANSWER_FROM event (mostly to help support)
+ * o Release flow control in disconnect_indication
+ * o Block packets while connecting (speed up connections)
+ *
+ * v5 - 11.01.01 - Jean II
+ * o Init self->max_header_size, just in case...
+ * o Set up ap->chan.hdrlen, to get zero copy on tx side working.
+ * o avoid tx->ttp->flow->ppp->tx->... loop, by checking flow state
+ * Thanks to Christian Gennerat for finding this bug !
+ * ---
+ * o Declare the proper MTU/MRU that we can support
+ * (but PPP doesn't read the MTU value :-()
+ * o Declare hashbin HB_NOLOCK instead of HB_LOCAL to avoid
+ * disabling and enabling irq twice
+ *
+ * v6 - 31.05.01 - Jean II
+ * o Print source address in Found, Discovery, Expiry & Request events
+ * o Print requested source address in /proc/net/irnet
+ * o Change control channel input. Allow multiple commands in one line.
+ * o Add saddr command to change ap->rsaddr (and use that in IrDA)
+ * ---
+ * o Make the IrDA connection procedure totally asynchronous.
+ * Heavy rewrite of the IAS query code and the whole connection
+ * procedure. Now, irnet_connect() no longer need to be called from
+ * a process context...
+ * o Enable IrDA connect retries in ppp_irnet_send(). The good thing
+ * is that IrDA connect retries are directly driven by PPP LCP
+ * retries (we retry for each LCP packet), so that everything
+ * is transparently controlled from pppd lcp-max-configure.
+ * o Add ttp_connect flag to prevent rentry on the connect procedure
+ * o Test and fixups to eliminate side effects of retries
+ *
+ * v7 - 22.08.01 - Jean II
+ * o Cleanup : Change "saddr = 0x0" to "saddr = DEV_ADDR_ANY"
+ * o Fix bug in BLOCK_WHEN_CONNECT introduced in v6 : due to the
+ * asynchronous IAS query, self->tsap is NULL when PPP send the
+ * first packet. This was preventing "connect-delay 0" to work.
+ * Change the test in ppp_irnet_send() to self->ttp_connect.
+ *
+ * v8 - 1.11.01 - Jean II
+ * o Tighten the use of self->ttp_connect and self->ttp_open to
+ * prevent various race conditions.
+ * o Avoid leaking discovery log and skb
+ * o Replace "self" with "server" in irnet_connect_indication() to
+ * better detect cut'n'paste error ;-)
+ *
+ * v9 - 29.11.01 - Jean II
+ * o Fix event generation in disconnect indication that I broke in v8
+ * It was always generation "No-Answer" because I was testing ttp_open
+ * just after clearing it. *blush*.
+ * o Use newly created irttp_listen() to fix potential crash when LAP
+ * destroyed before irnet module removed.
+ *
+ * v10 - 4.3.2 - Jean II
+ * o When receiving a disconnect indication, don't reenable the
+ * PPP Tx queue, this will trigger a reconnect. Instead, close
+ * the channel, which will kill pppd...
+ *
+ * v11 - 20.3.02 - Jean II
+ * o Oops ! v10 fix disabled IrNET retries and passive behaviour.
+ * Better fix in irnet_disconnect_indication() :
+ * - if connected, kill pppd via hangup.
+ * - if not connected, reenable ppp Tx, which trigger IrNET retry.
+ *
+ * v12 - 10.4.02 - Jean II
+ * o Fix race condition in irnet_connect_indication().
+ * If the socket was already trying to connect, drop old connection
+ * and use new one only if acting as primary. See comments.
+ *
+ * v13 - 30.5.02 - Jean II
+ * o Update module init code
+ *
+ * v14 - 20.2.03 - Jean II
+ * o Add discovery hint bits in the control channel.
+ * o Remove obsolete MOD_INC/DEC_USE_COUNT in favor of .owner
+ *
+ * v15 - 7.4.03 - Jean II
+ * o Replace spin_lock_irqsave() with spin_lock_bh() so that we can
+ * use ppp_unit_number(). It's probably also better overall...
+ * o Disable call to ppp_unregister_channel(), because we can't do it.
+ */
+
+/***************************** INCLUDES *****************************/
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/tty.h>
+#include <linux/proc_fs.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/netdevice.h>
+#include <linux/miscdevice.h>
+#include <linux/poll.h>
+#include <linux/config.h>
+#include <linux/ctype.h> /* isspace() */
+#include <asm/uaccess.h>
+#include <linux/init.h>
+
+#include <linux/ppp_defs.h>
+#include <linux/if_ppp.h>
+#include <linux/ppp_channel.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/iriap.h>
+#include <net/irda/irias_object.h>
+#include <net/irda/irlmp.h>
+#include <net/irda/irttp.h>
+#include <net/irda/discovery.h>
+
+/***************************** OPTIONS *****************************/
+/*
+ * Define or undefine to compile or not some optional part of the
+ * IrNET driver...
+ * Note : the present defaults make sense, play with that at your
+ * own risk...
+ */
+/* IrDA side of the business... */
+#define DISCOVERY_NOMASK /* To enable W2k compatibility... */
+#define ADVERTISE_HINT /* Advertise IrLAN hint bit */
+#define ALLOW_SIMULT_CONNECT /* This seem to work, cross fingers... */
+#define DISCOVERY_EVENTS /* Query the discovery log to post events */
+#define INITIAL_DISCOVERY /* Dump current discovery log as events */
+#undef STREAM_COMPAT /* Not needed - potentially messy */
+#undef CONNECT_INDIC_KICK /* Might mess IrDA, not needed */
+#undef FAIL_SEND_DISCONNECT /* Might mess IrDA, not needed */
+#undef PASS_CONNECT_PACKETS /* Not needed ? Safe */
+#undef MISSING_PPP_API /* Stuff I wish I could do */
+
+/* PPP side of the business */
+#define BLOCK_WHEN_CONNECT /* Block packets when connecting */
+#define CONNECT_IN_SEND /* Retry IrDA connection procedure */
+#undef FLUSH_TO_PPP /* Not sure about this one, let's play safe */
+#undef SECURE_DEVIRNET /* Bah... */
+
+/****************************** DEBUG ******************************/
+
+/*
+ * This set of flags enable and disable all the various warning,
+ * error and debug message of this driver.
+ * Each section can be enabled and disabled independently
+ */
+/* In the PPP part */
+#define DEBUG_CTRL_TRACE 0 /* Control channel */
+#define DEBUG_CTRL_INFO 0 /* various info */
+#define DEBUG_CTRL_ERROR 1 /* problems */
+#define DEBUG_FS_TRACE 0 /* filesystem callbacks */
+#define DEBUG_FS_INFO 0 /* various info */
+#define DEBUG_FS_ERROR 1 /* problems */
+#define DEBUG_PPP_TRACE 0 /* PPP related functions */
+#define DEBUG_PPP_INFO 0 /* various info */
+#define DEBUG_PPP_ERROR 1 /* problems */
+#define DEBUG_MODULE_TRACE 0 /* module insertion/removal */
+#define DEBUG_MODULE_ERROR 1 /* problems */
+
+/* In the IrDA part */
+#define DEBUG_IRDA_SR_TRACE 0 /* IRDA subroutines */
+#define DEBUG_IRDA_SR_INFO 0 /* various info */
+#define DEBUG_IRDA_SR_ERROR 1 /* problems */
+#define DEBUG_IRDA_SOCK_TRACE 0 /* IRDA main socket functions */
+#define DEBUG_IRDA_SOCK_INFO 0 /* various info */
+#define DEBUG_IRDA_SOCK_ERROR 1 /* problems */
+#define DEBUG_IRDA_SERV_TRACE 0 /* The IrNET server */
+#define DEBUG_IRDA_SERV_INFO 0 /* various info */
+#define DEBUG_IRDA_SERV_ERROR 1 /* problems */
+#define DEBUG_IRDA_TCB_TRACE 0 /* IRDA IrTTP callbacks */
+#define DEBUG_IRDA_CB_INFO 0 /* various info */
+#define DEBUG_IRDA_CB_ERROR 1 /* problems */
+#define DEBUG_IRDA_OCB_TRACE 0 /* IRDA other callbacks */
+#define DEBUG_IRDA_OCB_INFO 0 /* various info */
+#define DEBUG_IRDA_OCB_ERROR 1 /* problems */
+
+#define DEBUG_ASSERT 0 /* Verify all assertions */
+
+/*
+ * These are the macros we are using to actually print the debug
+ * statements. Don't look at it, it's ugly...
+ *
+ * One of the trick is that, as the DEBUG_XXX are constant, the
+ * compiler will optimise away the if() in all cases.
+ */
+/* All error messages (will show up in the normal logs) */
+#define DERROR(dbg, format, args...) \
+ {if(DEBUG_##dbg) \
+ printk(KERN_INFO "irnet: %s(): " format, __FUNCTION__ , ##args);}
+
+/* Normal debug message (will show up in /var/log/debug) */
+#define DEBUG(dbg, format, args...) \
+ {if(DEBUG_##dbg) \
+ printk(KERN_DEBUG "irnet: %s(): " format, __FUNCTION__ , ##args);}
+
+/* Entering a function (trace) */
+#define DENTER(dbg, format, args...) \
+ {if(DEBUG_##dbg) \
+ printk(KERN_DEBUG "irnet: -> %s" format, __FUNCTION__ , ##args);}
+
+/* Entering and exiting a function in one go (trace) */
+#define DPASS(dbg, format, args...) \
+ {if(DEBUG_##dbg) \
+ printk(KERN_DEBUG "irnet: <>%s" format, __FUNCTION__ , ##args);}
+
+/* Exiting a function (trace) */
+#define DEXIT(dbg, format, args...) \
+ {if(DEBUG_##dbg) \
+ printk(KERN_DEBUG "irnet: <-%s()" format, __FUNCTION__ , ##args);}
+
+/* Exit a function with debug */
+#define DRETURN(ret, dbg, args...) \
+ {DEXIT(dbg, ": " args);\
+ return ret; }
+
+/* Exit a function on failed condition */
+#define DABORT(cond, ret, dbg, args...) \
+ {if(cond) {\
+ DERROR(dbg, args);\
+ return ret; }}
+
+/* Invalid assertion, print out an error and exit... */
+#define DASSERT(cond, ret, dbg, args...) \
+ {if((DEBUG_ASSERT) && !(cond)) {\
+ DERROR(dbg, "Invalid assertion: " args);\
+ return ret; }}
+
+/************************ CONSTANTS & MACROS ************************/
+
+/* Paranoia */
+#define IRNET_MAGIC 0xB00754
+
+/* Number of control events in the control channel buffer... */
+#define IRNET_MAX_EVENTS 8 /* Should be more than enough... */
+
+/****************************** TYPES ******************************/
+
+/*
+ * This is the main structure where we store all the data pertaining to
+ * one instance of irnet.
+ * Note : in irnet functions, a pointer this structure is usually called
+ * "ap" or "self". If the code is borrowed from the IrDA stack, it tend
+ * to be called "self", and if it is borrowed from the PPP driver it is
+ * "ap". Apart from that, it's exactly the same structure ;-)
+ */
+typedef struct irnet_socket
+{
+ /* ------------------- Instance management ------------------- */
+ /* We manage a linked list of IrNET socket instances */
+ irda_queue_t q; /* Must be first - for hasbin */
+ int magic; /* Paranoia */
+
+ /* --------------------- FileSystem part --------------------- */
+ /* "pppd" interact directly with us on a /dev/ file */
+ struct file * file; /* File descriptor of this instance */
+ /* TTY stuff - to keep "pppd" happy */
+ struct termios termios; /* Various tty flags */
+ /* Stuff for the control channel */
+ int event_index; /* Last read in the event log */
+
+ /* ------------------------- PPP part ------------------------- */
+ /* We interface directly to the ppp_generic driver in the kernel */
+ int ppp_open; /* registered with ppp_generic */
+ struct ppp_channel chan; /* Interface to generic ppp layer */
+
+ int mru; /* Max size of PPP payload */
+ u32 xaccm[8]; /* Asynchronous character map (just */
+ u32 raccm; /* to please pppd - dummy) */
+ unsigned int flags; /* PPP flags (compression, ...) */
+ unsigned int rbits; /* Unused receive flags ??? */
+
+ /* ------------------------ IrTTP part ------------------------ */
+ /* We create a pseudo "socket" over the IrDA tranport */
+ unsigned long ttp_open; /* Set when IrTTP is ready */
+ unsigned long ttp_connect; /* Set when IrTTP is connecting */
+ struct tsap_cb * tsap; /* IrTTP instance (the connection) */
+
+ char rname[NICKNAME_MAX_LEN + 1];
+ /* IrDA nickname of destination */
+ __u32 rdaddr; /* Requested peer IrDA address */
+ __u32 rsaddr; /* Requested local IrDA address */
+ __u32 daddr; /* actual peer IrDA address */
+ __u32 saddr; /* my local IrDA address */
+ __u8 dtsap_sel; /* Remote TSAP selector */
+ __u8 stsap_sel; /* Local TSAP selector */
+
+ __u32 max_sdu_size_rx;/* Socket parameters used for IrTTP */
+ __u32 max_sdu_size_tx;
+ __u32 max_data_size;
+ __u8 max_header_size;
+ LOCAL_FLOW tx_flow; /* State of the Tx path in IrTTP */
+
+ /* ------------------- IrLMP and IrIAS part ------------------- */
+ /* Used for IrDA Discovery and socket name resolution */
+ void * ckey; /* IrLMP client handle */
+ __u16 mask; /* Hint bits mask (filter discov.)*/
+ int nslots; /* Number of slots for discovery */
+
+ struct iriap_cb * iriap; /* Used to query remote IAS */
+ int errno; /* status of the IAS query */
+
+ /* -------------------- Discovery log part -------------------- */
+ /* Used by initial discovery on the control channel
+ * and by irnet_discover_daddr_and_lsap_sel() */
+ struct irda_device_info *discoveries; /* Copy of the discovery log */
+ int disco_index; /* Last read in the discovery log */
+ int disco_number; /* Size of the discovery log */
+
+} irnet_socket;
+
+/*
+ * This is the various event that we will generate on the control channel
+ */
+typedef enum irnet_event
+{
+ IRNET_DISCOVER, /* New IrNET node discovered */
+ IRNET_EXPIRE, /* IrNET node expired */
+ IRNET_CONNECT_TO, /* IrNET socket has connected to other node */
+ IRNET_CONNECT_FROM, /* Other node has connected to IrNET socket */
+ IRNET_REQUEST_FROM, /* Non satisfied connection request */
+ IRNET_NOANSWER_FROM, /* Failed connection request */
+ IRNET_BLOCKED_LINK, /* Link (IrLAP) is blocked for > 3s */
+ IRNET_DISCONNECT_FROM, /* IrNET socket has disconnected */
+ IRNET_DISCONNECT_TO /* Closing IrNET socket */
+} irnet_event;
+
+/*
+ * This is the storage for an event and its arguments
+ */
+typedef struct irnet_log
+{
+ irnet_event event;
+ int unit;
+ __u32 saddr;
+ __u32 daddr;
+ char name[NICKNAME_MAX_LEN + 1]; /* 21 + 1 */
+ __u16_host_order hints; /* Discovery hint bits */
+} irnet_log;
+
+/*
+ * This is the storage for all events and related stuff...
+ */
+typedef struct irnet_ctrl_channel
+{
+ irnet_log log[IRNET_MAX_EVENTS]; /* Event log */
+ int index; /* Current index in log */
+ spinlock_t spinlock; /* Serialize access to the event log */
+ wait_queue_head_t rwait; /* processes blocked on read (or poll) */
+} irnet_ctrl_channel;
+
+/**************************** PROTOTYPES ****************************/
+/*
+ * Global functions of the IrNET module
+ * Note : we list here also functions called from one file to the other.
+ */
+
+/* -------------------------- IRDA PART -------------------------- */
+extern int
+ irda_irnet_create(irnet_socket *); /* Initialise a IrNET socket */
+extern int
+ irda_irnet_connect(irnet_socket *); /* Try to connect over IrDA */
+extern void
+ irda_irnet_destroy(irnet_socket *); /* Teardown a IrNET socket */
+extern int
+ irda_irnet_init(void); /* Initialise IrDA part of IrNET */
+extern void
+ irda_irnet_cleanup(void); /* Teardown IrDA part of IrNET */
+/* ---------------------------- MODULE ---------------------------- */
+extern int
+ irnet_init(void); /* Initialise IrNET module */
+
+/**************************** VARIABLES ****************************/
+
+/* Control channel stuff - allocated in irnet_irda.h */
+extern struct irnet_ctrl_channel irnet_events;
+
+#endif /* IRNET_H */
diff --git a/net/irda/irnet/irnet_irda.c b/net/irda/irnet/irnet_irda.c
new file mode 100644
index 0000000..07ec326
--- /dev/null
+++ b/net/irda/irnet/irnet_irda.c
@@ -0,0 +1,1866 @@
+/*
+ * IrNET protocol module : Synchronous PPP over an IrDA socket.
+ *
+ * Jean II - HPL `00 - <jt@hpl.hp.com>
+ *
+ * This file implement the IRDA interface of IrNET.
+ * Basically, we sit on top of IrTTP. We set up IrTTP, IrIAS properly,
+ * and exchange frames with IrTTP.
+ */
+
+#include "irnet_irda.h" /* Private header */
+
+/************************* CONTROL CHANNEL *************************/
+/*
+ * When ppp is not active, /dev/irnet act as a control channel.
+ * Writing allow to set up the IrDA destination of the IrNET channel,
+ * and any application may be read events happening on IrNET...
+ */
+
+/*------------------------------------------------------------------*/
+/*
+ * Post an event to the control channel...
+ * Put the event in the log, and then wait all process blocked on read
+ * so they can read the log...
+ */
+static void
+irnet_post_event(irnet_socket * ap,
+ irnet_event event,
+ __u32 saddr,
+ __u32 daddr,
+ char * name,
+ __u16 hints)
+{
+ int index; /* In the log */
+
+ DENTER(CTRL_TRACE, "(ap=0x%p, event=%d, daddr=%08x, name=``%s'')\n",
+ ap, event, daddr, name);
+
+ /* Protect this section via spinlock.
+ * Note : as we are the only event producer, we only need to exclude
+ * ourself when touching the log, which is nice and easy.
+ */
+ spin_lock_bh(&irnet_events.spinlock);
+
+ /* Copy the event in the log */
+ index = irnet_events.index;
+ irnet_events.log[index].event = event;
+ irnet_events.log[index].daddr = daddr;
+ irnet_events.log[index].saddr = saddr;
+ /* Try to copy IrDA nickname */
+ if(name)
+ strcpy(irnet_events.log[index].name, name);
+ else
+ irnet_events.log[index].name[0] = '\0';
+ /* Copy hints */
+ irnet_events.log[index].hints.word = hints;
+ /* Try to get ppp unit number */
+ if((ap != (irnet_socket *) NULL) && (ap->ppp_open))
+ irnet_events.log[index].unit = ppp_unit_number(&ap->chan);
+ else
+ irnet_events.log[index].unit = -1;
+
+ /* Increment the index
+ * Note that we increment the index only after the event is written,
+ * to make sure that the readers don't get garbage... */
+ irnet_events.index = (index + 1) % IRNET_MAX_EVENTS;
+
+ DEBUG(CTRL_INFO, "New event index is %d\n", irnet_events.index);
+
+ /* Spin lock end */
+ spin_unlock_bh(&irnet_events.spinlock);
+
+ /* Now : wake up everybody waiting for events... */
+ wake_up_interruptible_all(&irnet_events.rwait);
+
+ DEXIT(CTRL_TRACE, "\n");
+}
+
+/************************* IRDA SUBROUTINES *************************/
+/*
+ * These are a bunch of subroutines called from other functions
+ * down there, mostly common code or to improve readability...
+ *
+ * Note : we duplicate quite heavily some routines of af_irda.c,
+ * because our input structure (self) is quite different
+ * (struct irnet instead of struct irda_sock), which make sharing
+ * the same code impossible (at least, without templates).
+ */
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irda_open_tsap (self)
+ *
+ * Open local Transport Service Access Point (TSAP)
+ *
+ * Create a IrTTP instance for us and set all the IrTTP callbacks.
+ */
+static inline int
+irnet_open_tsap(irnet_socket * self)
+{
+ notify_t notify; /* Callback structure */
+
+ DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
+
+ DABORT(self->tsap != NULL, -EBUSY, IRDA_SR_ERROR, "Already busy !\n");
+
+ /* Initialize IrTTP callbacks to be used by the IrDA stack */
+ irda_notify_init(¬ify);
+ notify.connect_confirm = irnet_connect_confirm;
+ notify.connect_indication = irnet_connect_indication;
+ notify.disconnect_indication = irnet_disconnect_indication;
+ notify.data_indication = irnet_data_indication;
+ /*notify.udata_indication = NULL;*/
+ notify.flow_indication = irnet_flow_indication;
+ notify.status_indication = irnet_status_indication;
+ notify.instance = self;
+ strlcpy(notify.name, IRNET_NOTIFY_NAME, sizeof(notify.name));
+
+ /* Open an IrTTP instance */
+ self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
+ ¬ify);
+ DABORT(self->tsap == NULL, -ENOMEM,
+ IRDA_SR_ERROR, "Unable to allocate TSAP !\n");
+
+ /* Remember which TSAP selector we actually got */
+ self->stsap_sel = self->tsap->stsap_sel;
+
+ DEXIT(IRDA_SR_TRACE, " - tsap=0x%p, sel=0x%X\n",
+ self->tsap, self->stsap_sel);
+ return 0;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_ias_to_tsap (self, result, value)
+ *
+ * Examine an IAS object and extract TSAP
+ *
+ * We do an IAP query to find the TSAP associated with the IrNET service.
+ * When IrIAP pass us the result of the query, this function look at
+ * the return values to check for failures and extract the TSAP if
+ * possible.
+ * Also deallocate value
+ * The failure is in self->errno
+ * Return TSAP or -1
+ */
+static inline __u8
+irnet_ias_to_tsap(irnet_socket * self,
+ int result,
+ struct ias_value * value)
+{
+ __u8 dtsap_sel = 0; /* TSAP we are looking for */
+
+ DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
+
+ /* By default, no error */
+ self->errno = 0;
+
+ /* Check if request succeeded */
+ switch(result)
+ {
+ /* Standard errors : service not available */
+ case IAS_CLASS_UNKNOWN:
+ case IAS_ATTRIB_UNKNOWN:
+ DEBUG(IRDA_SR_INFO, "IAS object doesn't exist ! (%d)\n", result);
+ self->errno = -EADDRNOTAVAIL;
+ break;
+
+ /* Other errors, most likely IrDA stack failure */
+ default :
+ DEBUG(IRDA_SR_INFO, "IAS query failed ! (%d)\n", result);
+ self->errno = -EHOSTUNREACH;
+ break;
+
+ /* Success : we got what we wanted */
+ case IAS_SUCCESS:
+ break;
+ }
+
+ /* Check what was returned to us */
+ if(value != NULL)
+ {
+ /* What type of argument have we got ? */
+ switch(value->type)
+ {
+ case IAS_INTEGER:
+ DEBUG(IRDA_SR_INFO, "result=%d\n", value->t.integer);
+ if(value->t.integer != -1)
+ /* Get the remote TSAP selector */
+ dtsap_sel = value->t.integer;
+ else
+ self->errno = -EADDRNOTAVAIL;
+ break;
+ default:
+ self->errno = -EADDRNOTAVAIL;
+ DERROR(IRDA_SR_ERROR, "bad type ! (0x%X)\n", value->type);
+ break;
+ }
+
+ /* Cleanup */
+ irias_delete_value(value);
+ }
+ else /* value == NULL */
+ {
+ /* Nothing returned to us - usually result != SUCCESS */
+ if(!(self->errno))
+ {
+ DERROR(IRDA_SR_ERROR,
+ "IrDA bug : result == SUCCESS && value == NULL\n");
+ self->errno = -EHOSTUNREACH;
+ }
+ }
+ DEXIT(IRDA_SR_TRACE, "\n");
+
+ /* Return the TSAP */
+ return(dtsap_sel);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_find_lsap_sel (self)
+ *
+ * Try to lookup LSAP selector in remote LM-IAS
+ *
+ * Basically, we start a IAP query, and then go to sleep. When the query
+ * return, irnet_getvalue_confirm will wake us up, and we can examine the
+ * result of the query...
+ * Note that in some case, the query fail even before we go to sleep,
+ * creating some races...
+ */
+static inline int
+irnet_find_lsap_sel(irnet_socket * self)
+{
+ DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
+
+ /* This should not happen */
+ DABORT(self->iriap, -EBUSY, IRDA_SR_ERROR, "busy with a previous query.\n");
+
+ /* Create an IAP instance, will be closed in irnet_getvalue_confirm() */
+ self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
+ irnet_getvalue_confirm);
+
+ /* Treat unexpected signals as disconnect */
+ self->errno = -EHOSTUNREACH;
+
+ /* Query remote LM-IAS */
+ iriap_getvaluebyclass_request(self->iriap, self->rsaddr, self->daddr,
+ IRNET_SERVICE_NAME, IRNET_IAS_VALUE);
+
+ /* The above request is non-blocking.
+ * After a while, IrDA will call us back in irnet_getvalue_confirm()
+ * We will then call irnet_ias_to_tsap() and finish the
+ * connection procedure */
+
+ DEXIT(IRDA_SR_TRACE, "\n");
+ return 0;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_connect_tsap (self)
+ *
+ * Initialise the TTP socket and initiate TTP connection
+ *
+ */
+static inline int
+irnet_connect_tsap(irnet_socket * self)
+{
+ int err;
+
+ DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
+
+ /* Open a local TSAP (an IrTTP instance) */
+ err = irnet_open_tsap(self);
+ if(err != 0)
+ {
+ clear_bit(0, &self->ttp_connect);
+ DERROR(IRDA_SR_ERROR, "connect aborted!\n");
+ return(err);
+ }
+
+ /* Connect to remote device */
+ err = irttp_connect_request(self->tsap, self->dtsap_sel,
+ self->rsaddr, self->daddr, NULL,
+ self->max_sdu_size_rx, NULL);
+ if(err != 0)
+ {
+ clear_bit(0, &self->ttp_connect);
+ DERROR(IRDA_SR_ERROR, "connect aborted!\n");
+ return(err);
+ }
+
+ /* The above call is non-blocking.
+ * After a while, the IrDA stack will either call us back in
+ * irnet_connect_confirm() or irnet_disconnect_indication()
+ * See you there ;-) */
+
+ DEXIT(IRDA_SR_TRACE, "\n");
+ return(err);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_discover_next_daddr (self)
+ *
+ * Query the IrNET TSAP of the next device in the log.
+ *
+ * Used in the TSAP discovery procedure.
+ */
+static inline int
+irnet_discover_next_daddr(irnet_socket * self)
+{
+ /* Close the last instance of IrIAP, and open a new one.
+ * We can't reuse the IrIAP instance in the IrIAP callback */
+ if(self->iriap)
+ {
+ iriap_close(self->iriap);
+ self->iriap = NULL;
+ }
+ /* Create a new IAP instance */
+ self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
+ irnet_discovervalue_confirm);
+ if(self->iriap == NULL)
+ return -ENOMEM;
+
+ /* Next discovery - before the call to avoid races */
+ self->disco_index++;
+
+ /* Check if we have one more address to try */
+ if(self->disco_index < self->disco_number)
+ {
+ /* Query remote LM-IAS */
+ iriap_getvaluebyclass_request(self->iriap,
+ self->discoveries[self->disco_index].saddr,
+ self->discoveries[self->disco_index].daddr,
+ IRNET_SERVICE_NAME, IRNET_IAS_VALUE);
+ /* The above request is non-blocking.
+ * After a while, IrDA will call us back in irnet_discovervalue_confirm()
+ * We will then call irnet_ias_to_tsap() and come back here again... */
+ return(0);
+ }
+ else
+ return(1);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_discover_daddr_and_lsap_sel (self)
+ *
+ * This try to find a device with the requested service.
+ *
+ * Initiate a TSAP discovery procedure.
+ * It basically look into the discovery log. For each address in the list,
+ * it queries the LM-IAS of the device to find if this device offer
+ * the requested service.
+ * If there is more than one node supporting the service, we complain
+ * to the user (it should move devices around).
+ * If we find one node which have the requested TSAP, we connect to it.
+ *
+ * This function just start the whole procedure. It request the discovery
+ * log and submit the first IAS query.
+ * The bulk of the job is handled in irnet_discovervalue_confirm()
+ *
+ * Note : this procedure fails if there is more than one device in range
+ * on the same dongle, because IrLMP doesn't disconnect the LAP when the
+ * last LSAP is closed. Moreover, we would need to wait the LAP
+ * disconnection...
+ */
+static inline int
+irnet_discover_daddr_and_lsap_sel(irnet_socket * self)
+{
+ int ret;
+
+ DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
+
+ /* Ask lmp for the current discovery log */
+ self->discoveries = irlmp_get_discoveries(&self->disco_number, self->mask,
+ DISCOVERY_DEFAULT_SLOTS);
+
+ /* Check if the we got some results */
+ if(self->discoveries == NULL)
+ {
+ self->disco_number = -1;
+ clear_bit(0, &self->ttp_connect);
+ DRETURN(-ENETUNREACH, IRDA_SR_INFO, "No Cachelog...\n");
+ }
+ DEBUG(IRDA_SR_INFO, "Got the log (0x%p), size is %d\n",
+ self->discoveries, self->disco_number);
+
+ /* Start with the first discovery */
+ self->disco_index = -1;
+ self->daddr = DEV_ADDR_ANY;
+
+ /* This will fail if the log is empty - this is non-blocking */
+ ret = irnet_discover_next_daddr(self);
+ if(ret)
+ {
+ /* Close IAP */
+ if(self->iriap)
+ iriap_close(self->iriap);
+ self->iriap = NULL;
+
+ /* Cleanup our copy of the discovery log */
+ kfree(self->discoveries);
+ self->discoveries = NULL;
+
+ clear_bit(0, &self->ttp_connect);
+ DRETURN(-ENETUNREACH, IRDA_SR_INFO, "Cachelog empty...\n");
+ }
+
+ /* Follow me in irnet_discovervalue_confirm() */
+
+ DEXIT(IRDA_SR_TRACE, "\n");
+ return(0);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_dname_to_daddr (self)
+ *
+ * Convert an IrDA nickname to a valid IrDA address
+ *
+ * It basically look into the discovery log until there is a match.
+ */
+static inline int
+irnet_dname_to_daddr(irnet_socket * self)
+{
+ struct irda_device_info *discoveries; /* Copy of the discovery log */
+ int number; /* Number of nodes in the log */
+ int i;
+
+ DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
+
+ /* Ask lmp for the current discovery log */
+ discoveries = irlmp_get_discoveries(&number, 0xffff,
+ DISCOVERY_DEFAULT_SLOTS);
+ /* Check if the we got some results */
+ if(discoveries == NULL)
+ DRETURN(-ENETUNREACH, IRDA_SR_INFO, "Cachelog empty...\n");
+
+ /*
+ * Now, check all discovered devices (if any), and connect
+ * client only about the services that the client is
+ * interested in...
+ */
+ for(i = 0; i < number; i++)
+ {
+ /* Does the name match ? */
+ if(!strncmp(discoveries[i].info, self->rname, NICKNAME_MAX_LEN))
+ {
+ /* Yes !!! Get it.. */
+ self->daddr = discoveries[i].daddr;
+ DEBUG(IRDA_SR_INFO, "discovered device ``%s'' at address 0x%08x.\n",
+ self->rname, self->daddr);
+ kfree(discoveries);
+ DEXIT(IRDA_SR_TRACE, "\n");
+ return 0;
+ }
+ }
+ /* No luck ! */
+ DEBUG(IRDA_SR_INFO, "cannot discover device ``%s'' !!!\n", self->rname);
+ kfree(discoveries);
+ return(-EADDRNOTAVAIL);
+}
+
+
+/************************* SOCKET ROUTINES *************************/
+/*
+ * This are the main operations on IrNET sockets, basically to create
+ * and destroy IrNET sockets. These are called from the PPP part...
+ */
+
+/*------------------------------------------------------------------*/
+/*
+ * Create a IrNET instance : just initialise some parameters...
+ */
+int
+irda_irnet_create(irnet_socket * self)
+{
+ DENTER(IRDA_SOCK_TRACE, "(self=0x%p)\n", self);
+
+ self->magic = IRNET_MAGIC; /* Paranoia */
+
+ self->ttp_open = 0; /* Prevent higher layer from accessing IrTTP */
+ self->ttp_connect = 0; /* Not connecting yet */
+ self->rname[0] = '\0'; /* May be set via control channel */
+ self->rdaddr = DEV_ADDR_ANY; /* May be set via control channel */
+ self->rsaddr = DEV_ADDR_ANY; /* May be set via control channel */
+ self->daddr = DEV_ADDR_ANY; /* Until we get connected */
+ self->saddr = DEV_ADDR_ANY; /* Until we get connected */
+ self->max_sdu_size_rx = TTP_SAR_UNBOUND;
+
+ /* Register as a client with IrLMP */
+ self->ckey = irlmp_register_client(0, NULL, NULL, NULL);
+#ifdef DISCOVERY_NOMASK
+ self->mask = 0xffff; /* For W2k compatibility */
+#else /* DISCOVERY_NOMASK */
+ self->mask = irlmp_service_to_hint(S_LAN);
+#endif /* DISCOVERY_NOMASK */
+ self->tx_flow = FLOW_START; /* Flow control from IrTTP */
+
+ DEXIT(IRDA_SOCK_TRACE, "\n");
+ return(0);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Connect to the other side :
+ * o convert device name to an address
+ * o find the socket number (dlsap)
+ * o Establish the connection
+ *
+ * Note : We no longer mimic af_irda. The IAS query for finding the TSAP
+ * is done asynchronously, like the TTP connection. This allow us to
+ * call this function from any context (not only process).
+ * The downside is that following what's happening in there is tricky
+ * because it involve various functions all over the place...
+ */
+int
+irda_irnet_connect(irnet_socket * self)
+{
+ int err;
+
+ DENTER(IRDA_SOCK_TRACE, "(self=0x%p)\n", self);
+
+ /* Check if we are already trying to connect.
+ * Because irda_irnet_connect() can be called directly by pppd plus
+ * packet retries in ppp_generic and connect may take time, plus we may
+ * race with irnet_connect_indication(), we need to be careful there... */
+ if(test_and_set_bit(0, &self->ttp_connect))
+ DRETURN(-EBUSY, IRDA_SOCK_INFO, "Already connecting...\n");
+ if((self->iriap != NULL) || (self->tsap != NULL))
+ DERROR(IRDA_SOCK_ERROR, "Socket not cleaned up...\n");
+
+ /* Insert ourselves in the hashbin so that the IrNET server can find us.
+ * Notes : 4th arg is string of 32 char max and must be null terminated
+ * When 4th arg is used (string), 3rd arg isn't (int)
+ * Can't re-insert (MUST remove first) so check for that... */
+ if((irnet_server.running) && (self->q.q_next == NULL))
+ {
+ spin_lock_bh(&irnet_server.spinlock);
+ hashbin_insert(irnet_server.list, (irda_queue_t *) self, 0, self->rname);
+ spin_unlock_bh(&irnet_server.spinlock);
+ DEBUG(IRDA_SOCK_INFO, "Inserted ``%s'' in hashbin...\n", self->rname);
+ }
+
+ /* If we don't have anything (no address, no name) */
+ if((self->rdaddr == DEV_ADDR_ANY) && (self->rname[0] == '\0'))
+ {
+ /* Try to find a suitable address */
+ if((err = irnet_discover_daddr_and_lsap_sel(self)) != 0)
+ DRETURN(err, IRDA_SOCK_INFO, "auto-connect failed!\n");
+ /* In most cases, the call above is non-blocking */
+ }
+ else
+ {
+ /* If we have only the name (no address), try to get an address */
+ if(self->rdaddr == DEV_ADDR_ANY)
+ {
+ if((err = irnet_dname_to_daddr(self)) != 0)
+ DRETURN(err, IRDA_SOCK_INFO, "name connect failed!\n");
+ }
+ else
+ /* Use the requested destination address */
+ self->daddr = self->rdaddr;
+
+ /* Query remote LM-IAS to find LSAP selector */
+ irnet_find_lsap_sel(self);
+ /* The above call is non blocking */
+ }
+
+ /* At this point, we are waiting for the IrDA stack to call us back,
+ * or we have already failed.
+ * We will finish the connection procedure in irnet_connect_tsap().
+ */
+ DEXIT(IRDA_SOCK_TRACE, "\n");
+ return(0);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irda_irnet_destroy(self)
+ *
+ * Destroy irnet instance
+ *
+ * Note : this need to be called from a process context.
+ */
+void
+irda_irnet_destroy(irnet_socket * self)
+{
+ DENTER(IRDA_SOCK_TRACE, "(self=0x%p)\n", self);
+ if(self == NULL)
+ return;
+
+ /* Remove ourselves from hashbin (if we are queued in hashbin)
+ * Note : `irnet_server.running' protect us from calls in hashbin_delete() */
+ if((irnet_server.running) && (self->q.q_next != NULL))
+ {
+ struct irnet_socket * entry;
+ DEBUG(IRDA_SOCK_INFO, "Removing from hash..\n");
+ spin_lock_bh(&irnet_server.spinlock);
+ entry = hashbin_remove_this(irnet_server.list, (irda_queue_t *) self);
+ self->q.q_next = NULL;
+ spin_unlock_bh(&irnet_server.spinlock);
+ DASSERT(entry == self, , IRDA_SOCK_ERROR, "Can't remove from hash.\n");
+ }
+
+ /* If we were connected, post a message */
+ if(test_bit(0, &self->ttp_open))
+ {
+ /* Note : as the disconnect comes from ppp_generic, the unit number
+ * doesn't exist anymore when we post the event, so we need to pass
+ * NULL as the first arg... */
+ irnet_post_event(NULL, IRNET_DISCONNECT_TO,
+ self->saddr, self->daddr, self->rname, 0);
+ }
+
+ /* Prevent various IrDA callbacks from messing up things
+ * Need to be first */
+ clear_bit(0, &self->ttp_connect);
+
+ /* Prevent higher layer from accessing IrTTP */
+ clear_bit(0, &self->ttp_open);
+
+ /* Unregister with IrLMP */
+ irlmp_unregister_client(self->ckey);
+
+ /* Unregister with LM-IAS */
+ if(self->iriap)
+ {
+ iriap_close(self->iriap);
+ self->iriap = NULL;
+ }
+
+ /* Cleanup eventual discoveries from connection attempt or control channel */
+ if(self->discoveries != NULL)
+ {
+ /* Cleanup our copy of the discovery log */
+ kfree(self->discoveries);
+ self->discoveries = NULL;
+ }
+
+ /* Close our IrTTP connection */
+ if(self->tsap)
+ {
+ DEBUG(IRDA_SOCK_INFO, "Closing our TTP connection.\n");
+ irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
+ irttp_close_tsap(self->tsap);
+ self->tsap = NULL;
+ }
+ self->stsap_sel = 0;
+
+ DEXIT(IRDA_SOCK_TRACE, "\n");
+ return;
+}
+
+
+/************************** SERVER SOCKET **************************/
+/*
+ * The IrNET service is composed of one server socket and a variable
+ * number of regular IrNET sockets. The server socket is supposed to
+ * handle incoming connections and redirect them to one IrNET sockets.
+ * It's a superset of the regular IrNET socket, but has a very distinct
+ * behaviour...
+ */
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_daddr_to_dname (self)
+ *
+ * Convert an IrDA address to a IrDA nickname
+ *
+ * It basically look into the discovery log until there is a match.
+ */
+static inline int
+irnet_daddr_to_dname(irnet_socket * self)
+{
+ struct irda_device_info *discoveries; /* Copy of the discovery log */
+ int number; /* Number of nodes in the log */
+ int i;
+
+ DENTER(IRDA_SERV_TRACE, "(self=0x%p)\n", self);
+
+ /* Ask lmp for the current discovery log */
+ discoveries = irlmp_get_discoveries(&number, 0xffff,
+ DISCOVERY_DEFAULT_SLOTS);
+ /* Check if the we got some results */
+ if (discoveries == NULL)
+ DRETURN(-ENETUNREACH, IRDA_SERV_INFO, "Cachelog empty...\n");
+
+ /* Now, check all discovered devices (if any) */
+ for(i = 0; i < number; i++)
+ {
+ /* Does the name match ? */
+ if(discoveries[i].daddr == self->daddr)
+ {
+ /* Yes !!! Get it.. */
+ strlcpy(self->rname, discoveries[i].info, sizeof(self->rname));
+ self->rname[NICKNAME_MAX_LEN + 1] = '\0';
+ DEBUG(IRDA_SERV_INFO, "Device 0x%08x is in fact ``%s''.\n",
+ self->daddr, self->rname);
+ kfree(discoveries);
+ DEXIT(IRDA_SERV_TRACE, "\n");
+ return 0;
+ }
+ }
+ /* No luck ! */
+ DEXIT(IRDA_SERV_INFO, ": cannot discover device 0x%08x !!!\n", self->daddr);
+ kfree(discoveries);
+ return(-EADDRNOTAVAIL);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irda_find_socket (self)
+ *
+ * Find the correct IrNET socket
+ *
+ * Look into the list of IrNET sockets and finds one with the right
+ * properties...
+ */
+static inline irnet_socket *
+irnet_find_socket(irnet_socket * self)
+{
+ irnet_socket * new = (irnet_socket *) NULL;
+ int err;
+
+ DENTER(IRDA_SERV_TRACE, "(self=0x%p)\n", self);
+
+ /* Get the addresses of the requester */
+ self->daddr = irttp_get_daddr(self->tsap);
+ self->saddr = irttp_get_saddr(self->tsap);
+
+ /* Try to get the IrDA nickname of the requester */
+ err = irnet_daddr_to_dname(self);
+
+ /* Protect access to the instance list */
+ spin_lock_bh(&irnet_server.spinlock);
+
+ /* So now, try to get an socket having specifically
+ * requested that nickname */
+ if(err == 0)
+ {
+ new = (irnet_socket *) hashbin_find(irnet_server.list,
+ 0, self->rname);
+ if(new)
+ DEBUG(IRDA_SERV_INFO, "Socket 0x%p matches rname ``%s''.\n",
+ new, new->rname);
+ }
+
+ /* If no name matches, try to find an socket by the destination address */
+ /* It can be either the requested destination address (set via the
+ * control channel), or the current destination address if the
+ * socket is in the middle of a connection request */
+ if(new == (irnet_socket *) NULL)
+ {
+ new = (irnet_socket *) hashbin_get_first(irnet_server.list);
+ while(new !=(irnet_socket *) NULL)
+ {
+ /* Does it have the same address ? */
+ if((new->rdaddr == self->daddr) || (new->daddr == self->daddr))
+ {
+ /* Yes !!! Get it.. */
+ DEBUG(IRDA_SERV_INFO, "Socket 0x%p matches daddr %#08x.\n",
+ new, self->daddr);
+ break;
+ }
+ new = (irnet_socket *) hashbin_get_next(irnet_server.list);
+ }
+ }
+
+ /* If we don't have any socket, get the first unconnected socket */
+ if(new == (irnet_socket *) NULL)
+ {
+ new = (irnet_socket *) hashbin_get_first(irnet_server.list);
+ while(new !=(irnet_socket *) NULL)
+ {
+ /* Is it available ? */
+ if(!(test_bit(0, &new->ttp_open)) && (new->rdaddr == DEV_ADDR_ANY) &&
+ (new->rname[0] == '\0') && (new->ppp_open))
+ {
+ /* Yes !!! Get it.. */
+ DEBUG(IRDA_SERV_INFO, "Socket 0x%p is free.\n",
+ new);
+ break;
+ }
+ new = (irnet_socket *) hashbin_get_next(irnet_server.list);
+ }
+ }
+
+ /* Spin lock end */
+ spin_unlock_bh(&irnet_server.spinlock);
+
+ DEXIT(IRDA_SERV_TRACE, " - new = 0x%p\n", new);
+ return new;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irda_connect_socket (self)
+ *
+ * Connect an incoming connection to the socket
+ *
+ */
+static inline int
+irnet_connect_socket(irnet_socket * server,
+ irnet_socket * new,
+ struct qos_info * qos,
+ __u32 max_sdu_size,
+ __u8 max_header_size)
+{
+ DENTER(IRDA_SERV_TRACE, "(server=0x%p, new=0x%p)\n",
+ server, new);
+
+ /* Now attach up the new socket */
+ new->tsap = irttp_dup(server->tsap, new);
+ DABORT(new->tsap == NULL, -1, IRDA_SERV_ERROR, "dup failed!\n");
+
+ /* Set up all the relevant parameters on the new socket */
+ new->stsap_sel = new->tsap->stsap_sel;
+ new->dtsap_sel = new->tsap->dtsap_sel;
+ new->saddr = irttp_get_saddr(new->tsap);
+ new->daddr = irttp_get_daddr(new->tsap);
+
+ new->max_header_size = max_header_size;
+ new->max_sdu_size_tx = max_sdu_size;
+ new->max_data_size = max_sdu_size;
+#ifdef STREAM_COMPAT
+ /* If we want to receive "stream sockets" */
+ if(max_sdu_size == 0)
+ new->max_data_size = irttp_get_max_seg_size(new->tsap);
+#endif /* STREAM_COMPAT */
+
+ /* Clean up the original one to keep it in listen state */
+ irttp_listen(server->tsap);
+
+ /* Send a connection response on the new socket */
+ irttp_connect_response(new->tsap, new->max_sdu_size_rx, NULL);
+
+ /* Allow PPP to send its junk over the new socket... */
+ set_bit(0, &new->ttp_open);
+
+ /* Not connecting anymore, and clean up last possible remains
+ * of connection attempts on the socket */
+ clear_bit(0, &new->ttp_connect);
+ if(new->iriap)
+ {
+ iriap_close(new->iriap);
+ new->iriap = NULL;
+ }
+ if(new->discoveries != NULL)
+ {
+ kfree(new->discoveries);
+ new->discoveries = NULL;
+ }
+
+#ifdef CONNECT_INDIC_KICK
+ /* As currently we don't block packets in ppp_irnet_send() while passive,
+ * this is not really needed...
+ * Also, not doing it give IrDA a chance to finish the setup properly
+ * before being swamped with packets... */
+ ppp_output_wakeup(&new->chan);
+#endif /* CONNECT_INDIC_KICK */
+
+ /* Notify the control channel */
+ irnet_post_event(new, IRNET_CONNECT_FROM,
+ new->saddr, new->daddr, server->rname, 0);
+
+ DEXIT(IRDA_SERV_TRACE, "\n");
+ return 0;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irda_disconnect_server (self)
+ *
+ * Cleanup the server socket when the incoming connection abort
+ *
+ */
+static inline void
+irnet_disconnect_server(irnet_socket * self,
+ struct sk_buff *skb)
+{
+ DENTER(IRDA_SERV_TRACE, "(self=0x%p)\n", self);
+
+ /* Put the received packet in the black hole */
+ kfree_skb(skb);
+
+#ifdef FAIL_SEND_DISCONNECT
+ /* Tell the other party we don't want to be connected */
+ /* Hum... Is it the right thing to do ? And do we need to send
+ * a connect response before ? It looks ok without this... */
+ irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
+#endif /* FAIL_SEND_DISCONNECT */
+
+ /* Notify the control channel (see irnet_find_socket()) */
+ irnet_post_event(NULL, IRNET_REQUEST_FROM,
+ self->saddr, self->daddr, self->rname, 0);
+
+ /* Clean up the server to keep it in listen state */
+ irttp_listen(self->tsap);
+
+ DEXIT(IRDA_SERV_TRACE, "\n");
+ return;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irda_setup_server (self)
+ *
+ * Create a IrTTP server and set it up...
+ *
+ * Register the IrLAN hint bit, create a IrTTP instance for us,
+ * set all the IrTTP callbacks and create an IrIAS entry...
+ */
+static inline int
+irnet_setup_server(void)
+{
+ __u16 hints;
+
+ DENTER(IRDA_SERV_TRACE, "()\n");
+
+ /* Initialise the regular socket part of the server */
+ irda_irnet_create(&irnet_server.s);
+
+ /* Open a local TSAP (an IrTTP instance) for the server */
+ irnet_open_tsap(&irnet_server.s);
+
+ /* PPP part setup */
+ irnet_server.s.ppp_open = 0;
+ irnet_server.s.chan.private = NULL;
+ irnet_server.s.file = NULL;
+
+ /* Get the hint bit corresponding to IrLAN */
+ /* Note : we overload the IrLAN hint bit. As it is only a "hint", and as
+ * we provide roughly the same functionality as IrLAN, this is ok.
+ * In fact, the situation is similar as JetSend overloading the Obex hint
+ */
+ hints = irlmp_service_to_hint(S_LAN);
+
+#ifdef ADVERTISE_HINT
+ /* Register with IrLMP as a service (advertise our hint bit) */
+ irnet_server.skey = irlmp_register_service(hints);
+#endif /* ADVERTISE_HINT */
+
+ /* Register with LM-IAS (so that people can connect to us) */
+ irnet_server.ias_obj = irias_new_object(IRNET_SERVICE_NAME, jiffies);
+ irias_add_integer_attrib(irnet_server.ias_obj, IRNET_IAS_VALUE,
+ irnet_server.s.stsap_sel, IAS_KERNEL_ATTR);
+ irias_insert_object(irnet_server.ias_obj);
+
+#ifdef DISCOVERY_EVENTS
+ /* Tell IrLMP we want to be notified of newly discovered nodes */
+ irlmp_update_client(irnet_server.s.ckey, hints,
+ irnet_discovery_indication, irnet_expiry_indication,
+ (void *) &irnet_server.s);
+#endif
+
+ DEXIT(IRDA_SERV_TRACE, " - self=0x%p\n", &irnet_server.s);
+ return 0;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irda_destroy_server (self)
+ *
+ * Destroy the IrTTP server...
+ *
+ * Reverse of the previous function...
+ */
+static inline void
+irnet_destroy_server(void)
+{
+ DENTER(IRDA_SERV_TRACE, "()\n");
+
+#ifdef ADVERTISE_HINT
+ /* Unregister with IrLMP */
+ irlmp_unregister_service(irnet_server.skey);
+#endif /* ADVERTISE_HINT */
+
+ /* Unregister with LM-IAS */
+ if(irnet_server.ias_obj)
+ irias_delete_object(irnet_server.ias_obj);
+
+ /* Cleanup the socket part */
+ irda_irnet_destroy(&irnet_server.s);
+
+ DEXIT(IRDA_SERV_TRACE, "\n");
+ return;
+}
+
+
+/************************ IRDA-TTP CALLBACKS ************************/
+/*
+ * When we create a IrTTP instance, we pass to it a set of callbacks
+ * that IrTTP will call in case of various events.
+ * We take care of those events here.
+ */
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_data_indication (instance, sap, skb)
+ *
+ * Received some data from TinyTP. Just queue it on the receive queue
+ *
+ */
+static int
+irnet_data_indication(void * instance,
+ void * sap,
+ struct sk_buff *skb)
+{
+ irnet_socket * ap = (irnet_socket *) instance;
+ unsigned char * p;
+ int code = 0;
+
+ DENTER(IRDA_TCB_TRACE, "(self/ap=0x%p, skb=0x%p)\n",
+ ap, skb);
+ DASSERT(skb != NULL, 0, IRDA_CB_ERROR, "skb is NULL !!!\n");
+
+ /* Check is ppp is ready to receive our packet */
+ if(!ap->ppp_open)
+ {
+ DERROR(IRDA_CB_ERROR, "PPP not ready, dropping packet...\n");
+ /* When we return error, TTP will need to requeue the skb and
+ * will stop the sender. IrTTP will stall until we send it a
+ * flow control request... */
+ return -ENOMEM;
+ }
+
+ /* strip address/control field if present */
+ p = skb->data;
+ if((p[0] == PPP_ALLSTATIONS) && (p[1] == PPP_UI))
+ {
+ /* chop off address/control */
+ if(skb->len < 3)
+ goto err_exit;
+ p = skb_pull(skb, 2);
+ }
+
+ /* decompress protocol field if compressed */
+ if(p[0] & 1)
+ {
+ /* protocol is compressed */
+ skb_push(skb, 1)[0] = 0;
+ }
+ else
+ if(skb->len < 2)
+ goto err_exit;
+
+ /* pass to generic ppp layer */
+ /* Note : how do I know if ppp can accept or not the packet ? This is
+ * essential if I want to manage flow control smoothly... */
+ ppp_input(&ap->chan, skb);
+
+ DEXIT(IRDA_TCB_TRACE, "\n");
+ return 0;
+
+ err_exit:
+ DERROR(IRDA_CB_ERROR, "Packet too small, dropping...\n");
+ kfree_skb(skb);
+ ppp_input_error(&ap->chan, code);
+ return 0; /* Don't return an error code, only for flow control... */
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_disconnect_indication (instance, sap, reason, skb)
+ *
+ * Connection has been closed. Chech reason to find out why
+ *
+ * Note : there are many cases where we come here :
+ * o attempted to connect, timeout
+ * o connected, link is broken, LAP has timeout
+ * o connected, other side close the link
+ * o connection request on the server not handled
+ */
+static void
+irnet_disconnect_indication(void * instance,
+ void * sap,
+ LM_REASON reason,
+ struct sk_buff *skb)
+{
+ irnet_socket * self = (irnet_socket *) instance;
+ int test_open;
+ int test_connect;
+
+ DENTER(IRDA_TCB_TRACE, "(self=0x%p)\n", self);
+ DASSERT(self != NULL, , IRDA_CB_ERROR, "Self is NULL !!!\n");
+
+ /* Don't care about it, but let's not leak it */
+ if(skb)
+ dev_kfree_skb(skb);
+
+ /* Prevent higher layer from accessing IrTTP */
+ test_open = test_and_clear_bit(0, &self->ttp_open);
+ /* Not connecting anymore...
+ * (note : TSAP is open, so IAP callbacks are no longer pending...) */
+ test_connect = test_and_clear_bit(0, &self->ttp_connect);
+
+ /* If both self->ttp_open and self->ttp_connect are NULL, it mean that we
+ * have a race condition with irda_irnet_destroy() or
+ * irnet_connect_indication(), so don't mess up tsap...
+ */
+ if(!(test_open || test_connect))
+ {
+ DERROR(IRDA_CB_ERROR, "Race condition detected...\n");
+ return;
+ }
+
+ /* If we were active, notify the control channel */
+ if(test_open)
+ irnet_post_event(self, IRNET_DISCONNECT_FROM,
+ self->saddr, self->daddr, self->rname, 0);
+ else
+ /* If we were trying to connect, notify the control channel */
+ if((self->tsap) && (self != &irnet_server.s))
+ irnet_post_event(self, IRNET_NOANSWER_FROM,
+ self->saddr, self->daddr, self->rname, 0);
+
+ /* Close our IrTTP connection, cleanup tsap */
+ if((self->tsap) && (self != &irnet_server.s))
+ {
+ DEBUG(IRDA_CB_INFO, "Closing our TTP connection.\n");
+ irttp_close_tsap(self->tsap);
+ self->tsap = NULL;
+ }
+ /* Cleanup the socket in case we want to reconnect in ppp_output_wakeup() */
+ self->stsap_sel = 0;
+ self->daddr = DEV_ADDR_ANY;
+ self->tx_flow = FLOW_START;
+
+ /* Deal with the ppp instance if it's still alive */
+ if(self->ppp_open)
+ {
+ if(test_open)
+ {
+#ifdef MISSING_PPP_API
+ /* ppp_unregister_channel() wants a user context, which we
+ * are guaranteed to NOT have here. What are we supposed
+ * to do here ? Jean II */
+ /* If we were connected, cleanup & close the PPP channel,
+ * which will kill pppd (hangup) and the rest */
+ ppp_unregister_channel(&self->chan);
+ self->ppp_open = 0;
+#endif
+ }
+ else
+ {
+ /* If we were trying to connect, flush (drain) ppp_generic
+ * Tx queue (most often we have blocked it), which will
+ * trigger an other attempt to connect. If we are passive,
+ * this will empty the Tx queue after last try. */
+ ppp_output_wakeup(&self->chan);
+ }
+ }
+
+ DEXIT(IRDA_TCB_TRACE, "\n");
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_connect_confirm (instance, sap, qos, max_sdu_size, skb)
+ *
+ * Connections has been confirmed by the remote device
+ *
+ */
+static void
+irnet_connect_confirm(void * instance,
+ void * sap,
+ struct qos_info *qos,
+ __u32 max_sdu_size,
+ __u8 max_header_size,
+ struct sk_buff *skb)
+{
+ irnet_socket * self = (irnet_socket *) instance;
+
+ DENTER(IRDA_TCB_TRACE, "(self=0x%p)\n", self);
+
+ /* Check if socket is closing down (via irda_irnet_destroy()) */
+ if(! test_bit(0, &self->ttp_connect))
+ {
+ DERROR(IRDA_CB_ERROR, "Socket no longer connecting. Ouch !\n");
+ return;
+ }
+
+ /* How much header space do we need to reserve */
+ self->max_header_size = max_header_size;
+
+ /* IrTTP max SDU size in transmit direction */
+ self->max_sdu_size_tx = max_sdu_size;
+ self->max_data_size = max_sdu_size;
+#ifdef STREAM_COMPAT
+ if(max_sdu_size == 0)
+ self->max_data_size = irttp_get_max_seg_size(self->tsap);
+#endif /* STREAM_COMPAT */
+
+ /* At this point, IrLMP has assigned our source address */
+ self->saddr = irttp_get_saddr(self->tsap);
+
+ /* Allow higher layer to access IrTTP */
+ set_bit(0, &self->ttp_open);
+ clear_bit(0, &self->ttp_connect); /* Not racy, IrDA traffic is serial */
+ /* Give a kick in the ass of ppp_generic so that he sends us some data */
+ ppp_output_wakeup(&self->chan);
+
+ /* Check size of received packet */
+ if(skb->len > 0)
+ {
+#ifdef PASS_CONNECT_PACKETS
+ DEBUG(IRDA_CB_INFO, "Passing connect packet to PPP.\n");
+ /* Try to pass it to PPP */
+ irnet_data_indication(instance, sap, skb);
+#else /* PASS_CONNECT_PACKETS */
+ DERROR(IRDA_CB_ERROR, "Dropping non empty packet.\n");
+ kfree_skb(skb); /* Note : will be optimised with other kfree... */
+#endif /* PASS_CONNECT_PACKETS */
+ }
+ else
+ kfree_skb(skb);
+
+ /* Notify the control channel */
+ irnet_post_event(self, IRNET_CONNECT_TO,
+ self->saddr, self->daddr, self->rname, 0);
+
+ DEXIT(IRDA_TCB_TRACE, "\n");
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_flow_indication (instance, sap, flow)
+ *
+ * Used by TinyTP to tell us if it can accept more data or not
+ *
+ */
+static void
+irnet_flow_indication(void * instance,
+ void * sap,
+ LOCAL_FLOW flow)
+{
+ irnet_socket * self = (irnet_socket *) instance;
+ LOCAL_FLOW oldflow = self->tx_flow;
+
+ DENTER(IRDA_TCB_TRACE, "(self=0x%p, flow=%d)\n", self, flow);
+
+ /* Update our state */
+ self->tx_flow = flow;
+
+ /* Check what IrTTP want us to do... */
+ switch(flow)
+ {
+ case FLOW_START:
+ DEBUG(IRDA_CB_INFO, "IrTTP wants us to start again\n");
+ /* Check if we really need to wake up PPP */
+ if(oldflow == FLOW_STOP)
+ ppp_output_wakeup(&self->chan);
+ else
+ DEBUG(IRDA_CB_INFO, "But we were already transmitting !!!\n");
+ break;
+ case FLOW_STOP:
+ DEBUG(IRDA_CB_INFO, "IrTTP wants us to slow down\n");
+ break;
+ default:
+ DEBUG(IRDA_CB_INFO, "Unknown flow command!\n");
+ break;
+ }
+
+ DEXIT(IRDA_TCB_TRACE, "\n");
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_status_indication (instance, sap, reason, skb)
+ *
+ * Link (IrLAP) status report.
+ *
+ */
+static void
+irnet_status_indication(void * instance,
+ LINK_STATUS link,
+ LOCK_STATUS lock)
+{
+ irnet_socket * self = (irnet_socket *) instance;
+
+ DENTER(IRDA_TCB_TRACE, "(self=0x%p)\n", self);
+ DASSERT(self != NULL, , IRDA_CB_ERROR, "Self is NULL !!!\n");
+
+ /* We can only get this event if we are connected */
+ switch(link)
+ {
+ case STATUS_NO_ACTIVITY:
+ irnet_post_event(self, IRNET_BLOCKED_LINK,
+ self->saddr, self->daddr, self->rname, 0);
+ break;
+ default:
+ DEBUG(IRDA_CB_INFO, "Unknown status...\n");
+ }
+
+ DEXIT(IRDA_TCB_TRACE, "\n");
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_connect_indication(instance, sap, qos, max_sdu_size, userdata)
+ *
+ * Incoming connection
+ *
+ * In theory, this function is called only on the server socket.
+ * Some other node is attempting to connect to the IrNET service, and has
+ * sent a connection request on our server socket.
+ * We just redirect the connection to the relevant IrNET socket.
+ *
+ * Note : we also make sure that between 2 irnet nodes, there can
+ * exist only one irnet connection.
+ */
+static void
+irnet_connect_indication(void * instance,
+ void * sap,
+ struct qos_info *qos,
+ __u32 max_sdu_size,
+ __u8 max_header_size,
+ struct sk_buff *skb)
+{
+ irnet_socket * server = &irnet_server.s;
+ irnet_socket * new = (irnet_socket *) NULL;
+
+ DENTER(IRDA_TCB_TRACE, "(server=0x%p)\n", server);
+ DASSERT(instance == &irnet_server, , IRDA_CB_ERROR,
+ "Invalid instance (0x%p) !!!\n", instance);
+ DASSERT(sap == irnet_server.s.tsap, , IRDA_CB_ERROR, "Invalid sap !!!\n");
+
+ /* Try to find the most appropriate IrNET socket */
+ new = irnet_find_socket(server);
+
+ /* After all this hard work, do we have an socket ? */
+ if(new == (irnet_socket *) NULL)
+ {
+ DEXIT(IRDA_CB_INFO, ": No socket waiting for this connection.\n");
+ irnet_disconnect_server(server, skb);
+ return;
+ }
+
+ /* Is the socket already busy ? */
+ if(test_bit(0, &new->ttp_open))
+ {
+ DEXIT(IRDA_CB_INFO, ": Socket already connected.\n");
+ irnet_disconnect_server(server, skb);
+ return;
+ }
+
+ /* The following code is a bit tricky, so need comments ;-)
+ */
+ /* If ttp_connect is set, the socket is trying to connect to the other
+ * end and may have sent a IrTTP connection request and is waiting for
+ * a connection response (that may never come).
+ * Now, the pain is that the socket may have opened a tsap and is
+ * waiting on it, while the other end is trying to connect to it on
+ * another tsap.
+ * Because IrNET can be peer to peer, we need to workaround this.
+ * Furthermore, the way the irnetd script is implemented, the
+ * target will create a second IrNET connection back to the
+ * originator and expect the originator to bind this new connection
+ * to the original PPPD instance.
+ * And of course, if we don't use irnetd, we can have a race when
+ * both side try to connect simultaneously, which could leave both
+ * connections half closed (yuck).
+ * Conclusions :
+ * 1) The "originator" must accept the new connection and get rid
+ * of the old one so that irnetd works
+ * 2) One side must deny the new connection to avoid races,
+ * but both side must agree on which side it is...
+ * Most often, the originator is primary at the LAP layer.
+ * Jean II
+ */
+ /* Now, let's look at the way I wrote the test...
+ * We need to clear up the ttp_connect flag atomically to prevent
+ * irnet_disconnect_indication() to mess up the tsap we are going to close.
+ * We want to clear the ttp_connect flag only if we close the tsap,
+ * otherwise we will never close it, so we need to check for primary
+ * *before* doing the test on the flag.
+ * And of course, ALLOW_SIMULT_CONNECT can disable this entirely...
+ * Jean II
+ */
+
+ /* Socket already connecting ? On primary ? */
+ if(0
+#ifdef ALLOW_SIMULT_CONNECT
+ || ((irttp_is_primary(server->tsap) == 1) /* primary */
+ && (test_and_clear_bit(0, &new->ttp_connect)))
+#endif /* ALLOW_SIMULT_CONNECT */
+ )
+ {
+ DERROR(IRDA_CB_ERROR, "Socket already connecting, but going to reuse it !\n");
+
+ /* Cleanup the old TSAP if necessary - IrIAP will be cleaned up later */
+ if(new->tsap != NULL)
+ {
+ /* Close the old connection the new socket was attempting,
+ * so that we can hook it up to the new connection.
+ * It's now safe to do it... */
+ irttp_close_tsap(new->tsap);
+ new->tsap = NULL;
+ }
+ }
+ else
+ {
+ /* Three options :
+ * 1) socket was not connecting or connected : ttp_connect should be 0.
+ * 2) we don't want to connect the socket because we are secondary or
+ * ALLOW_SIMULT_CONNECT is undefined. ttp_connect should be 1.
+ * 3) we are half way in irnet_disconnect_indication(), and it's a
+ * nice race condition... Fortunately, we can detect that by checking
+ * if tsap is still alive. On the other hand, we can't be in
+ * irda_irnet_destroy() otherwise we would not have found this
+ * socket in the hashbin.
+ * Jean II */
+ if((test_bit(0, &new->ttp_connect)) || (new->tsap != NULL))
+ {
+ /* Don't mess this socket, somebody else in in charge... */
+ DERROR(IRDA_CB_ERROR, "Race condition detected, socket in use, abort connect...\n");
+ irnet_disconnect_server(server, skb);
+ return;
+ }
+ }
+
+ /* So : at this point, we have a socket, and it is idle. Good ! */
+ irnet_connect_socket(server, new, qos, max_sdu_size, max_header_size);
+
+ /* Check size of received packet */
+ if(skb->len > 0)
+ {
+#ifdef PASS_CONNECT_PACKETS
+ DEBUG(IRDA_CB_INFO, "Passing connect packet to PPP.\n");
+ /* Try to pass it to PPP */
+ irnet_data_indication(new, new->tsap, skb);
+#else /* PASS_CONNECT_PACKETS */
+ DERROR(IRDA_CB_ERROR, "Dropping non empty packet.\n");
+ kfree_skb(skb); /* Note : will be optimised with other kfree... */
+#endif /* PASS_CONNECT_PACKETS */
+ }
+ else
+ kfree_skb(skb);
+
+ DEXIT(IRDA_TCB_TRACE, "\n");
+}
+
+
+/********************** IRDA-IAS/LMP CALLBACKS **********************/
+/*
+ * These are the callbacks called by other layers of the IrDA stack,
+ * mainly LMP for discovery and IAS for name queries.
+ */
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_getvalue_confirm (result, obj_id, value, priv)
+ *
+ * Got answer from remote LM-IAS, just connect
+ *
+ * This is the reply to a IAS query we were doing to find the TSAP of
+ * the device we want to connect to.
+ * If we have found a valid TSAP, just initiate the TTP connection
+ * on this TSAP.
+ */
+static void
+irnet_getvalue_confirm(int result,
+ __u16 obj_id,
+ struct ias_value *value,
+ void * priv)
+{
+ irnet_socket * self = (irnet_socket *) priv;
+
+ DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
+ DASSERT(self != NULL, , IRDA_OCB_ERROR, "Self is NULL !!!\n");
+
+ /* Check if already connected (via irnet_connect_socket())
+ * or socket is closing down (via irda_irnet_destroy()) */
+ if(! test_bit(0, &self->ttp_connect))
+ {
+ DERROR(IRDA_OCB_ERROR, "Socket no longer connecting. Ouch !\n");
+ return;
+ }
+
+ /* We probably don't need to make any more queries */
+ iriap_close(self->iriap);
+ self->iriap = NULL;
+
+ /* Post process the IAS reply */
+ self->dtsap_sel = irnet_ias_to_tsap(self, result, value);
+
+ /* If error, just go out */
+ if(self->errno)
+ {
+ clear_bit(0, &self->ttp_connect);
+ DERROR(IRDA_OCB_ERROR, "IAS connect failed ! (0x%X)\n", self->errno);
+ return;
+ }
+
+ DEBUG(IRDA_OCB_INFO, "daddr = %08x, lsap = %d, starting IrTTP connection\n",
+ self->daddr, self->dtsap_sel);
+
+ /* Start up TTP - non blocking */
+ irnet_connect_tsap(self);
+
+ DEXIT(IRDA_OCB_TRACE, "\n");
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_discovervalue_confirm (result, obj_id, value, priv)
+ *
+ * Handle the TSAP discovery procedure state machine.
+ * Got answer from remote LM-IAS, try next device
+ *
+ * We are doing a TSAP discovery procedure, and we got an answer to
+ * a IAS query we were doing to find the TSAP on one of the address
+ * in the discovery log.
+ *
+ * If we have found a valid TSAP for the first time, save it. If it's
+ * not the first time we found one, complain.
+ *
+ * If we have more addresses in the log, just initiate a new query.
+ * Note that those query may fail (see irnet_discover_daddr_and_lsap_sel())
+ *
+ * Otherwise, wrap up the procedure (cleanup), check if we have found
+ * any device and connect to it.
+ */
+static void
+irnet_discovervalue_confirm(int result,
+ __u16 obj_id,
+ struct ias_value *value,
+ void * priv)
+{
+ irnet_socket * self = (irnet_socket *) priv;
+ __u8 dtsap_sel; /* TSAP we are looking for */
+
+ DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
+ DASSERT(self != NULL, , IRDA_OCB_ERROR, "Self is NULL !!!\n");
+
+ /* Check if already connected (via irnet_connect_socket())
+ * or socket is closing down (via irda_irnet_destroy()) */
+ if(! test_bit(0, &self->ttp_connect))
+ {
+ DERROR(IRDA_OCB_ERROR, "Socket no longer connecting. Ouch !\n");
+ return;
+ }
+
+ /* Post process the IAS reply */
+ dtsap_sel = irnet_ias_to_tsap(self, result, value);
+
+ /* Have we got something ? */
+ if(self->errno == 0)
+ {
+ /* We found the requested service */
+ if(self->daddr != DEV_ADDR_ANY)
+ {
+ DERROR(IRDA_OCB_ERROR, "More than one device in range supports IrNET...\n");
+ }
+ else
+ {
+ /* First time we found that one, save it ! */
+ self->daddr = self->discoveries[self->disco_index].daddr;
+ self->dtsap_sel = dtsap_sel;
+ }
+ }
+
+ /* If no failure */
+ if((self->errno == -EADDRNOTAVAIL) || (self->errno == 0))
+ {
+ int ret;
+
+ /* Search the next node */
+ ret = irnet_discover_next_daddr(self);
+ if(!ret)
+ {
+ /* In this case, the above request was non-blocking.
+ * We will return here after a while... */
+ return;
+ }
+ /* In this case, we have processed the last discovery item */
+ }
+
+ /* No more queries to be done (failure or last one) */
+
+ /* We probably don't need to make any more queries */
+ iriap_close(self->iriap);
+ self->iriap = NULL;
+
+ /* No more items : remove the log and signal termination */
+ DEBUG(IRDA_OCB_INFO, "Cleaning up log (0x%p)\n",
+ self->discoveries);
+ if(self->discoveries != NULL)
+ {
+ /* Cleanup our copy of the discovery log */
+ kfree(self->discoveries);
+ self->discoveries = NULL;
+ }
+ self->disco_number = -1;
+
+ /* Check out what we found */
+ if(self->daddr == DEV_ADDR_ANY)
+ {
+ self->daddr = DEV_ADDR_ANY;
+ clear_bit(0, &self->ttp_connect);
+ DEXIT(IRDA_OCB_TRACE, ": cannot discover IrNET in any device !!!\n");
+ return;
+ }
+
+ /* We have a valid address - just connect */
+
+ DEBUG(IRDA_OCB_INFO, "daddr = %08x, lsap = %d, starting IrTTP connection\n",
+ self->daddr, self->dtsap_sel);
+
+ /* Start up TTP - non blocking */
+ irnet_connect_tsap(self);
+
+ DEXIT(IRDA_OCB_TRACE, "\n");
+}
+
+#ifdef DISCOVERY_EVENTS
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_discovery_indication (discovery)
+ *
+ * Got a discovery indication from IrLMP, post an event
+ *
+ * Note : IrLMP take care of matching the hint mask for us, and also
+ * check if it is a "new" node for us...
+ *
+ * As IrLMP filter on the IrLAN hint bit, we get both IrLAN and IrNET
+ * nodes, so it's only at connection time that we will know if the
+ * node support IrNET, IrLAN or both. The other solution is to check
+ * in IAS the PNP ids and service name.
+ * Note : even if a node support IrNET (or IrLAN), it's no guarantee
+ * that we will be able to connect to it, the node might already be
+ * busy...
+ *
+ * One last thing : in some case, this function will trigger duplicate
+ * discovery events. On the other hand, we should catch all
+ * discoveries properly (i.e. not miss one). Filtering duplicate here
+ * is to messy, so we leave that to user space...
+ */
+static void
+irnet_discovery_indication(discinfo_t * discovery,
+ DISCOVERY_MODE mode,
+ void * priv)
+{
+ irnet_socket * self = &irnet_server.s;
+
+ DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
+ DASSERT(priv == &irnet_server, , IRDA_OCB_ERROR,
+ "Invalid instance (0x%p) !!!\n", priv);
+
+ DEBUG(IRDA_OCB_INFO, "Discovered new IrNET/IrLAN node %s...\n",
+ discovery->info);
+
+ /* Notify the control channel */
+ irnet_post_event(NULL, IRNET_DISCOVER,
+ discovery->saddr, discovery->daddr, discovery->info,
+ u16ho(discovery->hints));
+
+ DEXIT(IRDA_OCB_TRACE, "\n");
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_expiry_indication (expiry)
+ *
+ * Got a expiry indication from IrLMP, post an event
+ *
+ * Note : IrLMP take care of matching the hint mask for us, we only
+ * check if it is a "new" node...
+ */
+static void
+irnet_expiry_indication(discinfo_t * expiry,
+ DISCOVERY_MODE mode,
+ void * priv)
+{
+ irnet_socket * self = &irnet_server.s;
+
+ DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
+ DASSERT(priv == &irnet_server, , IRDA_OCB_ERROR,
+ "Invalid instance (0x%p) !!!\n", priv);
+
+ DEBUG(IRDA_OCB_INFO, "IrNET/IrLAN node %s expired...\n",
+ expiry->info);
+
+ /* Notify the control channel */
+ irnet_post_event(NULL, IRNET_EXPIRE,
+ expiry->saddr, expiry->daddr, expiry->info,
+ u16ho(expiry->hints));
+
+ DEXIT(IRDA_OCB_TRACE, "\n");
+}
+#endif /* DISCOVERY_EVENTS */
+
+
+/*********************** PROC ENTRY CALLBACKS ***********************/
+/*
+ * We create a instance in the /proc filesystem, and here we take care
+ * of that...
+ */
+
+#ifdef CONFIG_PROC_FS
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_proc_read (buf, start, offset, len, unused)
+ *
+ * Give some info to the /proc file system
+ */
+static int
+irnet_proc_read(char * buf,
+ char ** start,
+ off_t offset,
+ int len)
+{
+ irnet_socket * self;
+ char * state;
+ int i = 0;
+
+ len = 0;
+
+ /* Get the IrNET server information... */
+ len += sprintf(buf+len, "IrNET server - ");
+ len += sprintf(buf+len, "IrDA state: %s, ",
+ (irnet_server.running ? "running" : "dead"));
+ len += sprintf(buf+len, "stsap_sel: %02x, ", irnet_server.s.stsap_sel);
+ len += sprintf(buf+len, "dtsap_sel: %02x\n", irnet_server.s.dtsap_sel);
+
+ /* Do we need to continue ? */
+ if(!irnet_server.running)
+ return len;
+
+ /* Protect access to the instance list */
+ spin_lock_bh(&irnet_server.spinlock);
+
+ /* Get the sockets one by one... */
+ self = (irnet_socket *) hashbin_get_first(irnet_server.list);
+ while(self != NULL)
+ {
+ /* Start printing info about the socket. */
+ len += sprintf(buf+len, "\nIrNET socket %d - ", i++);
+
+ /* First, get the requested configuration */
+ len += sprintf(buf+len, "Requested IrDA name: \"%s\", ", self->rname);
+ len += sprintf(buf+len, "daddr: %08x, ", self->rdaddr);
+ len += sprintf(buf+len, "saddr: %08x\n", self->rsaddr);
+
+ /* Second, get all the PPP info */
+ len += sprintf(buf+len, " PPP state: %s",
+ (self->ppp_open ? "registered" : "unregistered"));
+ if(self->ppp_open)
+ {
+ len += sprintf(buf+len, ", unit: ppp%d",
+ ppp_unit_number(&self->chan));
+ len += sprintf(buf+len, ", channel: %d",
+ ppp_channel_index(&self->chan));
+ len += sprintf(buf+len, ", mru: %d",
+ self->mru);
+ /* Maybe add self->flags ? Later... */
+ }
+
+ /* Then, get all the IrDA specific info... */
+ if(self->ttp_open)
+ state = "connected";
+ else
+ if(self->tsap != NULL)
+ state = "connecting";
+ else
+ if(self->iriap != NULL)
+ state = "searching";
+ else
+ if(self->ttp_connect)
+ state = "weird";
+ else
+ state = "idle";
+ len += sprintf(buf+len, "\n IrDA state: %s, ", state);
+ len += sprintf(buf+len, "daddr: %08x, ", self->daddr);
+ len += sprintf(buf+len, "stsap_sel: %02x, ", self->stsap_sel);
+ len += sprintf(buf+len, "dtsap_sel: %02x\n", self->dtsap_sel);
+
+ /* Next socket, please... */
+ self = (irnet_socket *) hashbin_get_next(irnet_server.list);
+ }
+
+ /* Spin lock end */
+ spin_unlock_bh(&irnet_server.spinlock);
+
+ return len;
+}
+#endif /* PROC_FS */
+
+
+/********************** CONFIGURATION/CLEANUP **********************/
+/*
+ * Initialisation and teardown of the IrDA part, called at module
+ * insertion and removal...
+ */
+
+/*------------------------------------------------------------------*/
+/*
+ * Prepare the IrNET layer for operation...
+ */
+int __init
+irda_irnet_init(void)
+{
+ int err = 0;
+
+ DENTER(MODULE_TRACE, "()\n");
+
+ /* Pure paranoia - should be redundant */
+ memset(&irnet_server, 0, sizeof(struct irnet_root));
+
+ /* Setup start of irnet instance list */
+ irnet_server.list = hashbin_new(HB_NOLOCK);
+ DABORT(irnet_server.list == NULL, -ENOMEM,
+ MODULE_ERROR, "Can't allocate hashbin!\n");
+ /* Init spinlock for instance list */
+ spin_lock_init(&irnet_server.spinlock);
+
+ /* Initialise control channel */
+ init_waitqueue_head(&irnet_events.rwait);
+ irnet_events.index = 0;
+ /* Init spinlock for event logging */
+ spin_lock_init(&irnet_events.spinlock);
+
+#ifdef CONFIG_PROC_FS
+ /* Add a /proc file for irnet infos */
+ create_proc_info_entry("irnet", 0, proc_irda, irnet_proc_read);
+#endif /* CONFIG_PROC_FS */
+
+ /* Setup the IrNET server */
+ err = irnet_setup_server();
+
+ if(!err)
+ /* We are no longer functional... */
+ irnet_server.running = 1;
+
+ DEXIT(MODULE_TRACE, "\n");
+ return err;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Cleanup at exit...
+ */
+void __exit
+irda_irnet_cleanup(void)
+{
+ DENTER(MODULE_TRACE, "()\n");
+
+ /* We are no longer there... */
+ irnet_server.running = 0;
+
+#ifdef CONFIG_PROC_FS
+ /* Remove our /proc file */
+ remove_proc_entry("irnet", proc_irda);
+#endif /* CONFIG_PROC_FS */
+
+ /* Remove our IrNET server from existence */
+ irnet_destroy_server();
+
+ /* Remove all instances of IrNET socket still present */
+ hashbin_delete(irnet_server.list, (FREE_FUNC) irda_irnet_destroy);
+
+ DEXIT(MODULE_TRACE, "\n");
+}
diff --git a/net/irda/irnet/irnet_irda.h b/net/irda/irnet/irnet_irda.h
new file mode 100644
index 0000000..f2fecd3
--- /dev/null
+++ b/net/irda/irnet/irnet_irda.h
@@ -0,0 +1,186 @@
+/*
+ * IrNET protocol module : Synchronous PPP over an IrDA socket.
+ *
+ * Jean II - HPL `00 - <jt@hpl.hp.com>
+ *
+ * This file contains all definitions and declarations necessary for the
+ * IRDA part of the IrNET module (dealing with IrTTP, IrIAS and co).
+ * This file is a private header, so other modules don't want to know
+ * what's in there...
+ */
+
+#ifndef IRNET_IRDA_H
+#define IRNET_IRDA_H
+
+/***************************** INCLUDES *****************************/
+/* Please add other headers in irnet.h */
+
+#include "irnet.h" /* Module global include */
+
+/************************ CONSTANTS & MACROS ************************/
+
+/*
+ * Name of the service (socket name) used by IrNET
+ */
+/* IAS object name (or part of it) */
+#define IRNET_SERVICE_NAME "IrNetv1"
+/* IAS attribute */
+#define IRNET_IAS_VALUE "IrDA:TinyTP:LsapSel"
+/* LMP notify name for client (only for /proc/net/irda/irlmp) */
+#define IRNET_NOTIFY_NAME "IrNET socket"
+/* LMP notify name for server (only for /proc/net/irda/irlmp) */
+#define IRNET_NOTIFY_NAME_SERV "IrNET server"
+
+/****************************** TYPES ******************************/
+
+/*
+ * This is the main structure where we store all the data pertaining to
+ * the IrNET server (listen for connection requests) and the root
+ * of the IrNET socket list
+ */
+typedef struct irnet_root
+{
+ irnet_socket s; /* To pretend we are a client... */
+
+ /* Generic stuff */
+ int magic; /* Paranoia */
+ int running; /* Are we operational ? */
+
+ /* Link list of all IrNET instances opened */
+ hashbin_t * list;
+ spinlock_t spinlock; /* Serialize access to the list */
+ /* Note : the way hashbin has been designed is absolutely not
+ * reentrant, beware... So, we blindly protect all with spinlock */
+
+ /* Handle for the hint bit advertised in IrLMP */
+ void * skey;
+
+ /* Server socket part */
+ struct ias_object * ias_obj; /* Our service name + lsap in IAS */
+
+} irnet_root;
+
+
+/**************************** PROTOTYPES ****************************/
+
+/* ----------------------- CONTROL CHANNEL ----------------------- */
+static void
+ irnet_post_event(irnet_socket *,
+ irnet_event,
+ __u32,
+ __u32,
+ char *,
+ __u16);
+/* ----------------------- IRDA SUBROUTINES ----------------------- */
+static inline int
+ irnet_open_tsap(irnet_socket *);
+static inline __u8
+ irnet_ias_to_tsap(irnet_socket *,
+ int,
+ struct ias_value *);
+static inline int
+ irnet_find_lsap_sel(irnet_socket *);
+static inline int
+ irnet_connect_tsap(irnet_socket *);
+static inline int
+ irnet_discover_next_daddr(irnet_socket *);
+static inline int
+ irnet_discover_daddr_and_lsap_sel(irnet_socket *);
+static inline int
+ irnet_dname_to_daddr(irnet_socket *);
+/* ------------------------ SERVER SOCKET ------------------------ */
+static inline int
+ irnet_daddr_to_dname(irnet_socket *);
+static inline irnet_socket *
+ irnet_find_socket(irnet_socket *);
+static inline int
+ irnet_connect_socket(irnet_socket *,
+ irnet_socket *,
+ struct qos_info *,
+ __u32,
+ __u8);
+static inline void
+ irnet_disconnect_server(irnet_socket *,
+ struct sk_buff *);
+static inline int
+ irnet_setup_server(void);
+static inline void
+ irnet_destroy_server(void);
+/* ---------------------- IRDA-TTP CALLBACKS ---------------------- */
+static int
+ irnet_data_indication(void *, /* instance */
+ void *, /* sap */
+ struct sk_buff *);
+static void
+ irnet_disconnect_indication(void *,
+ void *,
+ LM_REASON,
+ struct sk_buff *);
+static void
+ irnet_connect_confirm(void *,
+ void *,
+ struct qos_info *,
+ __u32,
+ __u8,
+ struct sk_buff *);
+static void
+ irnet_flow_indication(void *,
+ void *,
+ LOCAL_FLOW);
+static void
+ irnet_status_indication(void *,
+ LINK_STATUS,
+ LOCK_STATUS);
+static void
+ irnet_connect_indication(void *,
+ void *,
+ struct qos_info *,
+ __u32,
+ __u8,
+ struct sk_buff *);
+/* -------------------- IRDA-IAS/LMP CALLBACKS -------------------- */
+static void
+ irnet_getvalue_confirm(int,
+ __u16,
+ struct ias_value *,
+ void *);
+static void
+ irnet_discovervalue_confirm(int,
+ __u16,
+ struct ias_value *,
+ void *);
+#ifdef DISCOVERY_EVENTS
+static void
+ irnet_discovery_indication(discinfo_t *,
+ DISCOVERY_MODE,
+ void *);
+static void
+ irnet_expiry_indication(discinfo_t *,
+ DISCOVERY_MODE,
+ void *);
+#endif
+/* -------------------------- PROC ENTRY -------------------------- */
+#ifdef CONFIG_PROC_FS
+static int
+ irnet_proc_read(char *,
+ char **,
+ off_t,
+ int);
+#endif /* CONFIG_PROC_FS */
+
+/**************************** VARIABLES ****************************/
+
+/*
+ * The IrNET server. Listen to connection requests and co...
+ */
+static struct irnet_root irnet_server;
+
+/* Control channel stuff (note : extern) */
+struct irnet_ctrl_channel irnet_events;
+
+/* The /proc/net/irda directory, defined elsewhere... */
+#ifdef CONFIG_PROC_FS
+extern struct proc_dir_entry *proc_irda;
+#endif /* CONFIG_PROC_FS */
+
+#endif /* IRNET_IRDA_H */
diff --git a/net/irda/irnet/irnet_ppp.c b/net/irda/irnet/irnet_ppp.c
new file mode 100644
index 0000000..f8f984b
--- /dev/null
+++ b/net/irda/irnet/irnet_ppp.c
@@ -0,0 +1,1142 @@
+/*
+ * IrNET protocol module : Synchronous PPP over an IrDA socket.
+ *
+ * Jean II - HPL `00 - <jt@hpl.hp.com>
+ *
+ * This file implement the PPP interface and /dev/irnet character device.
+ * The PPP interface hook to the ppp_generic module, handle all our
+ * relationship to the PPP code in the kernel (and by extension to pppd),
+ * and exchange PPP frames with this module (send/receive).
+ * The /dev/irnet device is used primarily for 2 functions :
+ * 1) as a stub for pppd (the ppp daemon), so that we can appropriately
+ * generate PPP sessions (we pretend we are a tty).
+ * 2) as a control channel (write commands, read events)
+ */
+
+#include "irnet_ppp.h" /* Private header */
+/* Please put other headers in irnet.h - Thanks */
+
+/* Generic PPP callbacks (to call us) */
+static struct ppp_channel_ops irnet_ppp_ops = {
+ .start_xmit = ppp_irnet_send,
+ .ioctl = ppp_irnet_ioctl
+};
+
+/************************* CONTROL CHANNEL *************************/
+/*
+ * When a pppd instance is not active on /dev/irnet, it acts as a control
+ * channel.
+ * Writing allow to set up the IrDA destination of the IrNET channel,
+ * and any application may be read events happening in IrNET...
+ */
+
+/*------------------------------------------------------------------*/
+/*
+ * Write is used to send a command to configure a IrNET channel
+ * before it is open by pppd. The syntax is : "command argument"
+ * Currently there is only two defined commands :
+ * o name : set the requested IrDA nickname of the IrNET peer.
+ * o addr : set the requested IrDA address of the IrNET peer.
+ * Note : the code is crude, but effective...
+ */
+static inline ssize_t
+irnet_ctrl_write(irnet_socket * ap,
+ const char __user *buf,
+ size_t count)
+{
+ char command[IRNET_MAX_COMMAND];
+ char * start; /* Current command being processed */
+ char * next; /* Next command to process */
+ int length; /* Length of current command */
+
+ DENTER(CTRL_TRACE, "(ap=0x%p, count=%Zd)\n", ap, count);
+
+ /* Check for overflow... */
+ DABORT(count >= IRNET_MAX_COMMAND, -ENOMEM,
+ CTRL_ERROR, "Too much data !!!\n");
+
+ /* Get the data in the driver */
+ if(copy_from_user(command, buf, count))
+ {
+ DERROR(CTRL_ERROR, "Invalid user space pointer.\n");
+ return -EFAULT;
+ }
+
+ /* Safe terminate the string */
+ command[count] = '\0';
+ DEBUG(CTRL_INFO, "Command line received is ``%s'' (%Zd).\n",
+ command, count);
+
+ /* Check every commands in the command line */
+ next = command;
+ while(next != NULL)
+ {
+ /* Look at the next command */
+ start = next;
+
+ /* Scrap whitespaces before the command */
+ while(isspace(*start))
+ start++;
+
+ /* ',' is our command separator */
+ next = strchr(start, ',');
+ if(next)
+ {
+ *next = '\0'; /* Terminate command */
+ length = next - start; /* Length */
+ next++; /* Skip the '\0' */
+ }
+ else
+ length = strlen(start);
+
+ DEBUG(CTRL_INFO, "Found command ``%s'' (%d).\n", start, length);
+
+ /* Check if we recognised one of the known command
+ * We can't use "switch" with strings, so hack with "continue" */
+
+ /* First command : name -> Requested IrDA nickname */
+ if(!strncmp(start, "name", 4))
+ {
+ /* Copy the name only if is included and not "any" */
+ if((length > 5) && (strcmp(start + 5, "any")))
+ {
+ /* Strip out trailing whitespaces */
+ while(isspace(start[length - 1]))
+ length--;
+
+ /* Copy the name for later reuse */
+ memcpy(ap->rname, start + 5, length - 5);
+ ap->rname[length - 5] = '\0';
+ }
+ else
+ ap->rname[0] = '\0';
+ DEBUG(CTRL_INFO, "Got rname = ``%s''\n", ap->rname);
+
+ /* Restart the loop */
+ continue;
+ }
+
+ /* Second command : addr, daddr -> Requested IrDA destination address
+ * Also process : saddr -> Requested IrDA source address */
+ if((!strncmp(start, "addr", 4)) ||
+ (!strncmp(start, "daddr", 5)) ||
+ (!strncmp(start, "saddr", 5)))
+ {
+ __u32 addr = DEV_ADDR_ANY;
+
+ /* Copy the address only if is included and not "any" */
+ if((length > 5) && (strcmp(start + 5, "any")))
+ {
+ char * begp = start + 5;
+ char * endp;
+
+ /* Scrap whitespaces before the command */
+ while(isspace(*begp))
+ begp++;
+
+ /* Convert argument to a number (last arg is the base) */
+ addr = simple_strtoul(begp, &endp, 16);
+ /* Has it worked ? (endp should be start + length) */
+ DABORT(endp <= (start + 5), -EINVAL,
+ CTRL_ERROR, "Invalid address.\n");
+ }
+ /* Which type of address ? */
+ if(start[0] == 's')
+ {
+ /* Save it */
+ ap->rsaddr = addr;
+ DEBUG(CTRL_INFO, "Got rsaddr = %08x\n", ap->rsaddr);
+ }
+ else
+ {
+ /* Save it */
+ ap->rdaddr = addr;
+ DEBUG(CTRL_INFO, "Got rdaddr = %08x\n", ap->rdaddr);
+ }
+
+ /* Restart the loop */
+ continue;
+ }
+
+ /* Other possible command : connect N (number of retries) */
+
+ /* No command matched -> Failed... */
+ DABORT(1, -EINVAL, CTRL_ERROR, "Not a recognised IrNET command.\n");
+ }
+
+ /* Success : we have parsed all commands successfully */
+ return(count);
+}
+
+#ifdef INITIAL_DISCOVERY
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_get_discovery_log (self)
+ *
+ * Query the content on the discovery log if not done
+ *
+ * This function query the current content of the discovery log
+ * at the startup of the event channel and save it in the internal struct.
+ */
+static void
+irnet_get_discovery_log(irnet_socket * ap)
+{
+ __u16 mask = irlmp_service_to_hint(S_LAN);
+
+ /* Ask IrLMP for the current discovery log */
+ ap->discoveries = irlmp_get_discoveries(&ap->disco_number, mask,
+ DISCOVERY_DEFAULT_SLOTS);
+
+ /* Check if the we got some results */
+ if(ap->discoveries == NULL)
+ ap->disco_number = -1;
+
+ DEBUG(CTRL_INFO, "Got the log (0x%p), size is %d\n",
+ ap->discoveries, ap->disco_number);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Function irnet_read_discovery_log (self, event)
+ *
+ * Read the content on the discovery log
+ *
+ * This function dump the current content of the discovery log
+ * at the startup of the event channel.
+ * Return 1 if wrote an event on the control channel...
+ *
+ * State of the ap->disco_XXX variables :
+ * Socket creation : discoveries = NULL ; disco_index = 0 ; disco_number = 0
+ * While reading : discoveries = ptr ; disco_index = X ; disco_number = Y
+ * After reading : discoveries = NULL ; disco_index = Y ; disco_number = -1
+ */
+static inline int
+irnet_read_discovery_log(irnet_socket * ap,
+ char * event)
+{
+ int done_event = 0;
+
+ DENTER(CTRL_TRACE, "(ap=0x%p, event=0x%p)\n",
+ ap, event);
+
+ /* Test if we have some work to do or we have already finished */
+ if(ap->disco_number == -1)
+ {
+ DEBUG(CTRL_INFO, "Already done\n");
+ return 0;
+ }
+
+ /* Test if it's the first time and therefore we need to get the log */
+ if(ap->discoveries == NULL)
+ irnet_get_discovery_log(ap);
+
+ /* Check if we have more item to dump */
+ if(ap->disco_index < ap->disco_number)
+ {
+ /* Write an event */
+ sprintf(event, "Found %08x (%s) behind %08x {hints %02X-%02X}\n",
+ ap->discoveries[ap->disco_index].daddr,
+ ap->discoveries[ap->disco_index].info,
+ ap->discoveries[ap->disco_index].saddr,
+ ap->discoveries[ap->disco_index].hints[0],
+ ap->discoveries[ap->disco_index].hints[1]);
+ DEBUG(CTRL_INFO, "Writing discovery %d : %s\n",
+ ap->disco_index, ap->discoveries[ap->disco_index].info);
+
+ /* We have an event */
+ done_event = 1;
+ /* Next discovery */
+ ap->disco_index++;
+ }
+
+ /* Check if we have done the last item */
+ if(ap->disco_index >= ap->disco_number)
+ {
+ /* No more items : remove the log and signal termination */
+ DEBUG(CTRL_INFO, "Cleaning up log (0x%p)\n",
+ ap->discoveries);
+ if(ap->discoveries != NULL)
+ {
+ /* Cleanup our copy of the discovery log */
+ kfree(ap->discoveries);
+ ap->discoveries = NULL;
+ }
+ ap->disco_number = -1;
+ }
+
+ return done_event;
+}
+#endif /* INITIAL_DISCOVERY */
+
+/*------------------------------------------------------------------*/
+/*
+ * Read is used to get IrNET events
+ */
+static inline ssize_t
+irnet_ctrl_read(irnet_socket * ap,
+ struct file * file,
+ char __user * buf,
+ size_t count)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ char event[64]; /* Max event is 61 char */
+ ssize_t ret = 0;
+
+ DENTER(CTRL_TRACE, "(ap=0x%p, count=%Zd)\n", ap, count);
+
+ /* Check if we can write an event out in one go */
+ DABORT(count < sizeof(event), -EOVERFLOW, CTRL_ERROR, "Buffer to small.\n");
+
+#ifdef INITIAL_DISCOVERY
+ /* Check if we have read the log */
+ if(irnet_read_discovery_log(ap, event))
+ {
+ /* We have an event !!! Copy it to the user */
+ if(copy_to_user(buf, event, strlen(event)))
+ {
+ DERROR(CTRL_ERROR, "Invalid user space pointer.\n");
+ return -EFAULT;
+ }
+
+ DEXIT(CTRL_TRACE, "\n");
+ return(strlen(event));
+ }
+#endif /* INITIAL_DISCOVERY */
+
+ /* Put ourselves on the wait queue to be woken up */
+ add_wait_queue(&irnet_events.rwait, &wait);
+ current->state = TASK_INTERRUPTIBLE;
+ for(;;)
+ {
+ /* If there is unread events */
+ ret = 0;
+ if(ap->event_index != irnet_events.index)
+ break;
+ ret = -EAGAIN;
+ if(file->f_flags & O_NONBLOCK)
+ break;
+ ret = -ERESTARTSYS;
+ if(signal_pending(current))
+ break;
+ /* Yield and wait to be woken up */
+ schedule();
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&irnet_events.rwait, &wait);
+
+ /* Did we got it ? */
+ if(ret != 0)
+ {
+ /* No, return the error code */
+ DEXIT(CTRL_TRACE, " - ret %Zd\n", ret);
+ return ret;
+ }
+
+ /* Which event is it ? */
+ switch(irnet_events.log[ap->event_index].event)
+ {
+ case IRNET_DISCOVER:
+ sprintf(event, "Discovered %08x (%s) behind %08x {hints %02X-%02X}\n",
+ irnet_events.log[ap->event_index].daddr,
+ irnet_events.log[ap->event_index].name,
+ irnet_events.log[ap->event_index].saddr,
+ irnet_events.log[ap->event_index].hints.byte[0],
+ irnet_events.log[ap->event_index].hints.byte[1]);
+ break;
+ case IRNET_EXPIRE:
+ sprintf(event, "Expired %08x (%s) behind %08x {hints %02X-%02X}\n",
+ irnet_events.log[ap->event_index].daddr,
+ irnet_events.log[ap->event_index].name,
+ irnet_events.log[ap->event_index].saddr,
+ irnet_events.log[ap->event_index].hints.byte[0],
+ irnet_events.log[ap->event_index].hints.byte[1]);
+ break;
+ case IRNET_CONNECT_TO:
+ sprintf(event, "Connected to %08x (%s) on ppp%d\n",
+ irnet_events.log[ap->event_index].daddr,
+ irnet_events.log[ap->event_index].name,
+ irnet_events.log[ap->event_index].unit);
+ break;
+ case IRNET_CONNECT_FROM:
+ sprintf(event, "Connection from %08x (%s) on ppp%d\n",
+ irnet_events.log[ap->event_index].daddr,
+ irnet_events.log[ap->event_index].name,
+ irnet_events.log[ap->event_index].unit);
+ break;
+ case IRNET_REQUEST_FROM:
+ sprintf(event, "Request from %08x (%s) behind %08x\n",
+ irnet_events.log[ap->event_index].daddr,
+ irnet_events.log[ap->event_index].name,
+ irnet_events.log[ap->event_index].saddr);
+ break;
+ case IRNET_NOANSWER_FROM:
+ sprintf(event, "No-answer from %08x (%s) on ppp%d\n",
+ irnet_events.log[ap->event_index].daddr,
+ irnet_events.log[ap->event_index].name,
+ irnet_events.log[ap->event_index].unit);
+ break;
+ case IRNET_BLOCKED_LINK:
+ sprintf(event, "Blocked link with %08x (%s) on ppp%d\n",
+ irnet_events.log[ap->event_index].daddr,
+ irnet_events.log[ap->event_index].name,
+ irnet_events.log[ap->event_index].unit);
+ break;
+ case IRNET_DISCONNECT_FROM:
+ sprintf(event, "Disconnection from %08x (%s) on ppp%d\n",
+ irnet_events.log[ap->event_index].daddr,
+ irnet_events.log[ap->event_index].name,
+ irnet_events.log[ap->event_index].unit);
+ break;
+ case IRNET_DISCONNECT_TO:
+ sprintf(event, "Disconnected to %08x (%s)\n",
+ irnet_events.log[ap->event_index].daddr,
+ irnet_events.log[ap->event_index].name);
+ break;
+ default:
+ sprintf(event, "Bug\n");
+ }
+ /* Increment our event index */
+ ap->event_index = (ap->event_index + 1) % IRNET_MAX_EVENTS;
+
+ DEBUG(CTRL_INFO, "Event is :%s", event);
+
+ /* Copy it to the user */
+ if(copy_to_user(buf, event, strlen(event)))
+ {
+ DERROR(CTRL_ERROR, "Invalid user space pointer.\n");
+ return -EFAULT;
+ }
+
+ DEXIT(CTRL_TRACE, "\n");
+ return(strlen(event));
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Poll : called when someone do a select on /dev/irnet.
+ * Just check if there are new events...
+ */
+static inline unsigned int
+irnet_ctrl_poll(irnet_socket * ap,
+ struct file * file,
+ poll_table * wait)
+{
+ unsigned int mask;
+
+ DENTER(CTRL_TRACE, "(ap=0x%p)\n", ap);
+
+ poll_wait(file, &irnet_events.rwait, wait);
+ mask = POLLOUT | POLLWRNORM;
+ /* If there is unread events */
+ if(ap->event_index != irnet_events.index)
+ mask |= POLLIN | POLLRDNORM;
+#ifdef INITIAL_DISCOVERY
+ if(ap->disco_number != -1)
+ {
+ /* Test if it's the first time and therefore we need to get the log */
+ if(ap->discoveries == NULL)
+ irnet_get_discovery_log(ap);
+ /* Recheck */
+ if(ap->disco_number != -1)
+ mask |= POLLIN | POLLRDNORM;
+ }
+#endif /* INITIAL_DISCOVERY */
+
+ DEXIT(CTRL_TRACE, " - mask=0x%X\n", mask);
+ return mask;
+}
+
+
+/*********************** FILESYSTEM CALLBACKS ***********************/
+/*
+ * Implement the usual open, read, write functions that will be called
+ * by the file system when some action is performed on /dev/irnet.
+ * Most of those actions will in fact be performed by "pppd" or
+ * the control channel, we just act as a redirector...
+ */
+
+/*------------------------------------------------------------------*/
+/*
+ * Open : when somebody open /dev/irnet
+ * We basically create a new instance of irnet and initialise it.
+ */
+static int
+dev_irnet_open(struct inode * inode,
+ struct file * file)
+{
+ struct irnet_socket * ap;
+ int err;
+
+ DENTER(FS_TRACE, "(file=0x%p)\n", file);
+
+#ifdef SECURE_DEVIRNET
+ /* This could (should?) be enforced by the permissions on /dev/irnet. */
+ if(!capable(CAP_NET_ADMIN))
+ return -EPERM;
+#endif /* SECURE_DEVIRNET */
+
+ /* Allocate a private structure for this IrNET instance */
+ ap = kmalloc(sizeof(*ap), GFP_KERNEL);
+ DABORT(ap == NULL, -ENOMEM, FS_ERROR, "Can't allocate struct irnet...\n");
+
+ /* initialize the irnet structure */
+ memset(ap, 0, sizeof(*ap));
+ ap->file = file;
+
+ /* PPP channel setup */
+ ap->ppp_open = 0;
+ ap->chan.private = ap;
+ ap->chan.ops = &irnet_ppp_ops;
+ ap->chan.mtu = (2048 - TTP_MAX_HEADER - 2 - PPP_HDRLEN);
+ ap->chan.hdrlen = 2 + TTP_MAX_HEADER; /* for A/C + Max IrDA hdr */
+ /* PPP parameters */
+ ap->mru = (2048 - TTP_MAX_HEADER - 2 - PPP_HDRLEN);
+ ap->xaccm[0] = ~0U;
+ ap->xaccm[3] = 0x60000000U;
+ ap->raccm = ~0U;
+
+ /* Setup the IrDA part... */
+ err = irda_irnet_create(ap);
+ if(err)
+ {
+ DERROR(FS_ERROR, "Can't setup IrDA link...\n");
+ kfree(ap);
+ return err;
+ }
+
+ /* For the control channel */
+ ap->event_index = irnet_events.index; /* Cancel all past events */
+
+ /* Put our stuff where we will be able to find it later */
+ file->private_data = ap;
+
+ DEXIT(FS_TRACE, " - ap=0x%p\n", ap);
+ return 0;
+}
+
+
+/*------------------------------------------------------------------*/
+/*
+ * Close : when somebody close /dev/irnet
+ * Destroy the instance of /dev/irnet
+ */
+static int
+dev_irnet_close(struct inode * inode,
+ struct file * file)
+{
+ irnet_socket * ap = (struct irnet_socket *) file->private_data;
+
+ DENTER(FS_TRACE, "(file=0x%p, ap=0x%p)\n",
+ file, ap);
+ DABORT(ap == NULL, 0, FS_ERROR, "ap is NULL !!!\n");
+
+ /* Detach ourselves */
+ file->private_data = NULL;
+
+ /* Close IrDA stuff */
+ irda_irnet_destroy(ap);
+
+ /* Disconnect from the generic PPP layer if not already done */
+ if(ap->ppp_open)
+ {
+ DERROR(FS_ERROR, "Channel still registered - deregistering !\n");
+ ap->ppp_open = 0;
+ ppp_unregister_channel(&ap->chan);
+ }
+
+ kfree(ap);
+
+ DEXIT(FS_TRACE, "\n");
+ return 0;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Write does nothing.
+ * (we receive packet from ppp_generic through ppp_irnet_send())
+ */
+static ssize_t
+dev_irnet_write(struct file * file,
+ const char __user *buf,
+ size_t count,
+ loff_t * ppos)
+{
+ irnet_socket * ap = (struct irnet_socket *) file->private_data;
+
+ DPASS(FS_TRACE, "(file=0x%p, ap=0x%p, count=%Zd)\n",
+ file, ap, count);
+ DABORT(ap == NULL, -ENXIO, FS_ERROR, "ap is NULL !!!\n");
+
+ /* If we are connected to ppp_generic, let it handle the job */
+ if(ap->ppp_open)
+ return -EAGAIN;
+ else
+ return irnet_ctrl_write(ap, buf, count);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Read doesn't do much either.
+ * (pppd poll us, but ultimately reads through /dev/ppp)
+ */
+static ssize_t
+dev_irnet_read(struct file * file,
+ char __user * buf,
+ size_t count,
+ loff_t * ppos)
+{
+ irnet_socket * ap = (struct irnet_socket *) file->private_data;
+
+ DPASS(FS_TRACE, "(file=0x%p, ap=0x%p, count=%Zd)\n",
+ file, ap, count);
+ DABORT(ap == NULL, -ENXIO, FS_ERROR, "ap is NULL !!!\n");
+
+ /* If we are connected to ppp_generic, let it handle the job */
+ if(ap->ppp_open)
+ return -EAGAIN;
+ else
+ return irnet_ctrl_read(ap, file, buf, count);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Poll : called when someone do a select on /dev/irnet
+ */
+static unsigned int
+dev_irnet_poll(struct file * file,
+ poll_table * wait)
+{
+ irnet_socket * ap = (struct irnet_socket *) file->private_data;
+ unsigned int mask;
+
+ DENTER(FS_TRACE, "(file=0x%p, ap=0x%p)\n",
+ file, ap);
+
+ mask = POLLOUT | POLLWRNORM;
+ DABORT(ap == NULL, mask, FS_ERROR, "ap is NULL !!!\n");
+
+ /* If we are connected to ppp_generic, let it handle the job */
+ if(!ap->ppp_open)
+ mask |= irnet_ctrl_poll(ap, file, wait);
+
+ DEXIT(FS_TRACE, " - mask=0x%X\n", mask);
+ return(mask);
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * IOCtl : Called when someone does some ioctls on /dev/irnet
+ * This is the way pppd configure us and control us while the PPP
+ * instance is active.
+ */
+static int
+dev_irnet_ioctl(struct inode * inode,
+ struct file * file,
+ unsigned int cmd,
+ unsigned long arg)
+{
+ irnet_socket * ap = (struct irnet_socket *) file->private_data;
+ int err;
+ int val;
+ void __user *argp = (void __user *)arg;
+
+ DENTER(FS_TRACE, "(file=0x%p, ap=0x%p, cmd=0x%X)\n",
+ file, ap, cmd);
+
+ /* Basic checks... */
+ DASSERT(ap != NULL, -ENXIO, PPP_ERROR, "ap is NULL...\n");
+#ifdef SECURE_DEVIRNET
+ if(!capable(CAP_NET_ADMIN))
+ return -EPERM;
+#endif /* SECURE_DEVIRNET */
+
+ err = -EFAULT;
+ switch(cmd)
+ {
+ /* Set discipline (should be N_SYNC_PPP or N_TTY) */
+ case TIOCSETD:
+ if(get_user(val, (int __user *)argp))
+ break;
+ if((val == N_SYNC_PPP) || (val == N_PPP))
+ {
+ DEBUG(FS_INFO, "Entering PPP discipline.\n");
+ /* PPP channel setup (ap->chan in configued in dev_irnet_open())*/
+ err = ppp_register_channel(&ap->chan);
+ if(err == 0)
+ {
+ /* Our ppp side is active */
+ ap->ppp_open = 1;
+
+ DEBUG(FS_INFO, "Trying to establish a connection.\n");
+ /* Setup the IrDA link now - may fail... */
+ irda_irnet_connect(ap);
+ }
+ else
+ DERROR(FS_ERROR, "Can't setup PPP channel...\n");
+ }
+ else
+ {
+ /* In theory, should be N_TTY */
+ DEBUG(FS_INFO, "Exiting PPP discipline.\n");
+ /* Disconnect from the generic PPP layer */
+ if(ap->ppp_open)
+ {
+ ap->ppp_open = 0;
+ ppp_unregister_channel(&ap->chan);
+ }
+ else
+ DERROR(FS_ERROR, "Channel not registered !\n");
+ err = 0;
+ }
+ break;
+
+ /* Query PPP channel and unit number */
+ case PPPIOCGCHAN:
+ if(!ap->ppp_open)
+ break;
+ if(put_user(ppp_channel_index(&ap->chan), (int __user *)argp))
+ break;
+ DEBUG(FS_INFO, "Query channel.\n");
+ err = 0;
+ break;
+ case PPPIOCGUNIT:
+ if(!ap->ppp_open)
+ break;
+ if(put_user(ppp_unit_number(&ap->chan), (int __user *)argp))
+ break;
+ DEBUG(FS_INFO, "Query unit number.\n");
+ err = 0;
+ break;
+
+ /* All these ioctls can be passed both directly and from ppp_generic,
+ * so we just deal with them in one place...
+ */
+ case PPPIOCGFLAGS:
+ case PPPIOCSFLAGS:
+ case PPPIOCGASYNCMAP:
+ case PPPIOCSASYNCMAP:
+ case PPPIOCGRASYNCMAP:
+ case PPPIOCSRASYNCMAP:
+ case PPPIOCGXASYNCMAP:
+ case PPPIOCSXASYNCMAP:
+ case PPPIOCGMRU:
+ case PPPIOCSMRU:
+ DEBUG(FS_INFO, "Standard PPP ioctl.\n");
+ if(!capable(CAP_NET_ADMIN))
+ err = -EPERM;
+ else
+ err = ppp_irnet_ioctl(&ap->chan, cmd, arg);
+ break;
+
+ /* TTY IOCTLs : Pretend that we are a tty, to keep pppd happy */
+ /* Get termios */
+ case TCGETS:
+ DEBUG(FS_INFO, "Get termios.\n");
+ if(kernel_termios_to_user_termios((struct termios __user *)argp, &ap->termios))
+ break;
+ err = 0;
+ break;
+ /* Set termios */
+ case TCSETSF:
+ DEBUG(FS_INFO, "Set termios.\n");
+ if(user_termios_to_kernel_termios(&ap->termios, (struct termios __user *)argp))
+ break;
+ err = 0;
+ break;
+
+ /* Set DTR/RTS */
+ case TIOCMBIS:
+ case TIOCMBIC:
+ /* Set exclusive/non-exclusive mode */
+ case TIOCEXCL:
+ case TIOCNXCL:
+ DEBUG(FS_INFO, "TTY compatibility.\n");
+ err = 0;
+ break;
+
+ case TCGETA:
+ DEBUG(FS_INFO, "TCGETA\n");
+ break;
+
+ case TCFLSH:
+ DEBUG(FS_INFO, "TCFLSH\n");
+ /* Note : this will flush buffers in PPP, so it *must* be done
+ * We should also worry that we don't accept junk here and that
+ * we get rid of our own buffers */
+#ifdef FLUSH_TO_PPP
+ ppp_output_wakeup(&ap->chan);
+#endif /* FLUSH_TO_PPP */
+ err = 0;
+ break;
+
+ case FIONREAD:
+ DEBUG(FS_INFO, "FIONREAD\n");
+ val = 0;
+ if(put_user(val, (int __user *)argp))
+ break;
+ err = 0;
+ break;
+
+ default:
+ DERROR(FS_ERROR, "Unsupported ioctl (0x%X)\n", cmd);
+ err = -ENOIOCTLCMD;
+ }
+
+ DEXIT(FS_TRACE, " - err = 0x%X\n", err);
+ return err;
+}
+
+/************************** PPP CALLBACKS **************************/
+/*
+ * This are the functions that the generic PPP driver in the kernel
+ * will call to communicate to us.
+ */
+
+/*------------------------------------------------------------------*/
+/*
+ * Prepare the ppp frame for transmission over the IrDA socket.
+ * We make sure that the header space is enough, and we change ppp header
+ * according to flags passed by pppd.
+ * This is not a callback, but just a helper function used in ppp_irnet_send()
+ */
+static inline struct sk_buff *
+irnet_prepare_skb(irnet_socket * ap,
+ struct sk_buff * skb)
+{
+ unsigned char * data;
+ int proto; /* PPP protocol */
+ int islcp; /* Protocol == LCP */
+ int needaddr; /* Need PPP address */
+
+ DENTER(PPP_TRACE, "(ap=0x%p, skb=0x%p)\n",
+ ap, skb);
+
+ /* Extract PPP protocol from the frame */
+ data = skb->data;
+ proto = (data[0] << 8) + data[1];
+
+ /* LCP packets with codes between 1 (configure-request)
+ * and 7 (code-reject) must be sent as though no options
+ * have been negotiated. */
+ islcp = (proto == PPP_LCP) && (1 <= data[2]) && (data[2] <= 7);
+
+ /* compress protocol field if option enabled */
+ if((data[0] == 0) && (ap->flags & SC_COMP_PROT) && (!islcp))
+ skb_pull(skb,1);
+
+ /* Check if we need address/control fields */
+ needaddr = 2*((ap->flags & SC_COMP_AC) == 0 || islcp);
+
+ /* Is the skb headroom large enough to contain all IrDA-headers? */
+ if((skb_headroom(skb) < (ap->max_header_size + needaddr)) ||
+ (skb_shared(skb)))
+ {
+ struct sk_buff * new_skb;
+
+ DEBUG(PPP_INFO, "Reallocating skb\n");
+
+ /* Create a new skb */
+ new_skb = skb_realloc_headroom(skb, ap->max_header_size + needaddr);
+
+ /* We have to free the original skb anyway */
+ dev_kfree_skb(skb);
+
+ /* Did the realloc succeed ? */
+ DABORT(new_skb == NULL, NULL, PPP_ERROR, "Could not realloc skb\n");
+
+ /* Use the new skb instead */
+ skb = new_skb;
+ }
+
+ /* prepend address/control fields if necessary */
+ if(needaddr)
+ {
+ skb_push(skb, 2);
+ skb->data[0] = PPP_ALLSTATIONS;
+ skb->data[1] = PPP_UI;
+ }
+
+ DEXIT(PPP_TRACE, "\n");
+
+ return skb;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Send a packet to the peer over the IrTTP connection.
+ * Returns 1 iff the packet was accepted.
+ * Returns 0 iff packet was not consumed.
+ * If the packet was not accepted, we will call ppp_output_wakeup
+ * at some later time to reactivate flow control in ppp_generic.
+ */
+static int
+ppp_irnet_send(struct ppp_channel * chan,
+ struct sk_buff * skb)
+{
+ irnet_socket * self = (struct irnet_socket *) chan->private;
+ int ret;
+
+ DENTER(PPP_TRACE, "(channel=0x%p, ap/self=0x%p)\n",
+ chan, self);
+
+ /* Check if things are somewhat valid... */
+ DASSERT(self != NULL, 0, PPP_ERROR, "Self is NULL !!!\n");
+
+ /* Check if we are connected */
+ if(!(test_bit(0, &self->ttp_open)))
+ {
+#ifdef CONNECT_IN_SEND
+ /* Let's try to connect one more time... */
+ /* Note : we won't be connected after this call, but we should be
+ * ready for next packet... */
+ /* If we are already connecting, this will fail */
+ irda_irnet_connect(self);
+#endif /* CONNECT_IN_SEND */
+
+ DEBUG(PPP_INFO, "IrTTP not ready ! (%ld-%ld)\n",
+ self->ttp_open, self->ttp_connect);
+
+ /* Note : we can either drop the packet or block the packet.
+ *
+ * Blocking the packet allow us a better connection time,
+ * because by calling ppp_output_wakeup() we can have
+ * ppp_generic resending the LCP request immediately to us,
+ * rather than waiting for one of pppd periodic transmission of
+ * LCP request.
+ *
+ * On the other hand, if we block all packet, all those periodic
+ * transmissions of pppd accumulate in ppp_generic, creating a
+ * backlog of LCP request. When we eventually connect later on,
+ * we have to transmit all this backlog before we can connect
+ * proper (if we don't timeout before).
+ *
+ * The current strategy is as follow :
+ * While we are attempting to connect, we block packets to get
+ * a better connection time.
+ * If we fail to connect, we drain the queue and start dropping packets
+ */
+#ifdef BLOCK_WHEN_CONNECT
+ /* If we are attempting to connect */
+ if(test_bit(0, &self->ttp_connect))
+ {
+ /* Blocking packet, ppp_generic will retry later */
+ return 0;
+ }
+#endif /* BLOCK_WHEN_CONNECT */
+
+ /* Dropping packet, pppd will retry later */
+ dev_kfree_skb(skb);
+ return 1;
+ }
+
+ /* Check if the queue can accept any packet, otherwise block */
+ if(self->tx_flow != FLOW_START)
+ DRETURN(0, PPP_INFO, "IrTTP queue full (%d skbs)...\n",
+ skb_queue_len(&self->tsap->tx_queue));
+
+ /* Prepare ppp frame for transmission */
+ skb = irnet_prepare_skb(self, skb);
+ DABORT(skb == NULL, 1, PPP_ERROR, "Prepare skb for Tx failed.\n");
+
+ /* Send the packet to IrTTP */
+ ret = irttp_data_request(self->tsap, skb);
+ if(ret < 0)
+ {
+ /*
+ * > IrTTPs tx queue is full, so we just have to
+ * > drop the frame! You might think that we should
+ * > just return -1 and don't deallocate the frame,
+ * > but that is dangerous since it's possible that
+ * > we have replaced the original skb with a new
+ * > one with larger headroom, and that would really
+ * > confuse do_dev_queue_xmit() in dev.c! I have
+ * > tried :-) DB
+ * Correction : we verify the flow control above (self->tx_flow),
+ * so we come here only if IrTTP doesn't like the packet (empty,
+ * too large, IrTTP not connected). In those rare cases, it's ok
+ * to drop it, we don't want to see it here again...
+ * Jean II
+ */
+ DERROR(PPP_ERROR, "IrTTP doesn't like this packet !!! (0x%X)\n", ret);
+ /* irttp_data_request already free the packet */
+ }
+
+ DEXIT(PPP_TRACE, "\n");
+ return 1; /* Packet has been consumed */
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Take care of the ioctls that ppp_generic doesn't want to deal with...
+ * Note : we are also called from dev_irnet_ioctl().
+ */
+static int
+ppp_irnet_ioctl(struct ppp_channel * chan,
+ unsigned int cmd,
+ unsigned long arg)
+{
+ irnet_socket * ap = (struct irnet_socket *) chan->private;
+ int err;
+ int val;
+ u32 accm[8];
+ void __user *argp = (void __user *)arg;
+
+ DENTER(PPP_TRACE, "(channel=0x%p, ap=0x%p, cmd=0x%X)\n",
+ chan, ap, cmd);
+
+ /* Basic checks... */
+ DASSERT(ap != NULL, -ENXIO, PPP_ERROR, "ap is NULL...\n");
+
+ err = -EFAULT;
+ switch(cmd)
+ {
+ /* PPP flags */
+ case PPPIOCGFLAGS:
+ val = ap->flags | ap->rbits;
+ if(put_user(val, (int __user *) argp))
+ break;
+ err = 0;
+ break;
+ case PPPIOCSFLAGS:
+ if(get_user(val, (int __user *) argp))
+ break;
+ ap->flags = val & ~SC_RCV_BITS;
+ ap->rbits = val & SC_RCV_BITS;
+ err = 0;
+ break;
+
+ /* Async map stuff - all dummy to please pppd */
+ case PPPIOCGASYNCMAP:
+ if(put_user(ap->xaccm[0], (u32 __user *) argp))
+ break;
+ err = 0;
+ break;
+ case PPPIOCSASYNCMAP:
+ if(get_user(ap->xaccm[0], (u32 __user *) argp))
+ break;
+ err = 0;
+ break;
+ case PPPIOCGRASYNCMAP:
+ if(put_user(ap->raccm, (u32 __user *) argp))
+ break;
+ err = 0;
+ break;
+ case PPPIOCSRASYNCMAP:
+ if(get_user(ap->raccm, (u32 __user *) argp))
+ break;
+ err = 0;
+ break;
+ case PPPIOCGXASYNCMAP:
+ if(copy_to_user(argp, ap->xaccm, sizeof(ap->xaccm)))
+ break;
+ err = 0;
+ break;
+ case PPPIOCSXASYNCMAP:
+ if(copy_from_user(accm, argp, sizeof(accm)))
+ break;
+ accm[2] &= ~0x40000000U; /* can't escape 0x5e */
+ accm[3] |= 0x60000000U; /* must escape 0x7d, 0x7e */
+ memcpy(ap->xaccm, accm, sizeof(ap->xaccm));
+ err = 0;
+ break;
+
+ /* Max PPP frame size */
+ case PPPIOCGMRU:
+ if(put_user(ap->mru, (int __user *) argp))
+ break;
+ err = 0;
+ break;
+ case PPPIOCSMRU:
+ if(get_user(val, (int __user *) argp))
+ break;
+ if(val < PPP_MRU)
+ val = PPP_MRU;
+ ap->mru = val;
+ err = 0;
+ break;
+
+ default:
+ DEBUG(PPP_INFO, "Unsupported ioctl (0x%X)\n", cmd);
+ err = -ENOIOCTLCMD;
+ }
+
+ DEXIT(PPP_TRACE, " - err = 0x%X\n", err);
+ return err;
+}
+
+/************************** INITIALISATION **************************/
+/*
+ * Module initialisation and all that jazz...
+ */
+
+/*------------------------------------------------------------------*/
+/*
+ * Hook our device callbacks in the filesystem, to connect our code
+ * to /dev/irnet
+ */
+static inline int __init
+ppp_irnet_init(void)
+{
+ int err = 0;
+
+ DENTER(MODULE_TRACE, "()\n");
+
+ /* Allocate ourselves as a minor in the misc range */
+ err = misc_register(&irnet_misc_device);
+
+ DEXIT(MODULE_TRACE, "\n");
+ return err;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Cleanup at exit...
+ */
+static inline void __exit
+ppp_irnet_cleanup(void)
+{
+ DENTER(MODULE_TRACE, "()\n");
+
+ /* De-allocate /dev/irnet minor in misc range */
+ misc_deregister(&irnet_misc_device);
+
+ DEXIT(MODULE_TRACE, "\n");
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Module main entry point
+ */
+int __init
+irnet_init(void)
+{
+ int err;
+
+ /* Initialise both parts... */
+ err = irda_irnet_init();
+ if(!err)
+ err = ppp_irnet_init();
+ return err;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Module exit
+ */
+static void __exit
+irnet_cleanup(void)
+{
+ irda_irnet_cleanup();
+ ppp_irnet_cleanup();
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * Module magic
+ */
+module_init(irnet_init);
+module_exit(irnet_cleanup);
+MODULE_AUTHOR("Jean Tourrilhes <jt@hpl.hp.com>");
+MODULE_DESCRIPTION("IrNET : Synchronous PPP over IrDA");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV(10, 187);
diff --git a/net/irda/irnet/irnet_ppp.h b/net/irda/irnet/irnet_ppp.h
new file mode 100644
index 0000000..d2beb7d
--- /dev/null
+++ b/net/irda/irnet/irnet_ppp.h
@@ -0,0 +1,119 @@
+/*
+ * IrNET protocol module : Synchronous PPP over an IrDA socket.
+ *
+ * Jean II - HPL `00 - <jt@hpl.hp.com>
+ *
+ * This file contains all definitions and declarations necessary for the
+ * PPP part of the IrNET module.
+ * This file is a private header, so other modules don't want to know
+ * what's in there...
+ */
+
+#ifndef IRNET_PPP_H
+#define IRNET_PPP_H
+
+/***************************** INCLUDES *****************************/
+
+#include "irnet.h" /* Module global include */
+
+/************************ CONSTANTS & MACROS ************************/
+
+/* /dev/irnet file constants */
+#define IRNET_MAJOR 10 /* Misc range */
+#define IRNET_MINOR 187 /* Official allocation */
+
+/* IrNET control channel stuff */
+#define IRNET_MAX_COMMAND 256 /* Max length of a command line */
+
+/* PPP hardcore stuff */
+
+/* Bits in rbits (PPP flags in irnet struct) */
+#define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
+
+/* Bit numbers in busy */
+#define XMIT_BUSY 0
+#define RECV_BUSY 1
+#define XMIT_WAKEUP 2
+#define XMIT_FULL 3
+
+/* Queue management */
+#define PPPSYNC_MAX_RQLEN 32 /* arbitrary */
+
+/****************************** TYPES ******************************/
+
+
+/**************************** PROTOTYPES ****************************/
+
+/* ----------------------- CONTROL CHANNEL ----------------------- */
+static inline ssize_t
+ irnet_ctrl_write(irnet_socket *,
+ const char *,
+ size_t);
+static inline ssize_t
+ irnet_ctrl_read(irnet_socket *,
+ struct file *,
+ char *,
+ size_t);
+static inline unsigned int
+ irnet_ctrl_poll(irnet_socket *,
+ struct file *,
+ poll_table *);
+/* ----------------------- CHARACTER DEVICE ----------------------- */
+static int
+ dev_irnet_open(struct inode *, /* fs callback : open */
+ struct file *),
+ dev_irnet_close(struct inode *,
+ struct file *);
+static ssize_t
+ dev_irnet_write(struct file *,
+ const char __user *,
+ size_t,
+ loff_t *),
+ dev_irnet_read(struct file *,
+ char __user *,
+ size_t,
+ loff_t *);
+static unsigned int
+ dev_irnet_poll(struct file *,
+ poll_table *);
+static int
+ dev_irnet_ioctl(struct inode *,
+ struct file *,
+ unsigned int,
+ unsigned long);
+/* ------------------------ PPP INTERFACE ------------------------ */
+static inline struct sk_buff *
+ irnet_prepare_skb(irnet_socket *,
+ struct sk_buff *);
+static int
+ ppp_irnet_send(struct ppp_channel *,
+ struct sk_buff *);
+static int
+ ppp_irnet_ioctl(struct ppp_channel *,
+ unsigned int,
+ unsigned long);
+
+/**************************** VARIABLES ****************************/
+
+/* Filesystem callbacks (to call us) */
+static struct file_operations irnet_device_fops =
+{
+ .owner = THIS_MODULE,
+ .read = dev_irnet_read,
+ .write = dev_irnet_write,
+ .poll = dev_irnet_poll,
+ .ioctl = dev_irnet_ioctl,
+ .open = dev_irnet_open,
+ .release = dev_irnet_close
+ /* Also : llseek, readdir, mmap, flush, fsync, fasync, lock, readv, writev */
+};
+
+/* Structure so that the misc major (drivers/char/misc.c) take care of us... */
+static struct miscdevice irnet_misc_device =
+{
+ IRNET_MINOR,
+ "irnet",
+ &irnet_device_fops
+};
+
+#endif /* IRNET_PPP_H */