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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/irda/irnet
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'net/irda/irnet')
-rw-r--r--net/irda/irnet/Kconfig13
-rw-r--r--net/irda/irnet/Makefile7
-rw-r--r--net/irda/irnet/irnet.h529
-rw-r--r--net/irda/irnet/irnet_irda.c1866
-rw-r--r--net/irda/irnet/irnet_irda.h186
-rw-r--r--net/irda/irnet/irnet_ppp.c1142
-rw-r--r--net/irda/irnet/irnet_ppp.h119
7 files changed, 3862 insertions, 0 deletions
diff --git a/net/irda/irnet/Kconfig b/net/irda/irnet/Kconfig
new file mode 100644
index 000000000000..28c557f0fdd2
--- /dev/null
+++ b/net/irda/irnet/Kconfig
@@ -0,0 +1,13 @@
1config IRNET
2 tristate "IrNET protocol"
3 depends on IRDA && PPP
4 help
5 Say Y here if you want to build support for the IrNET protocol.
6 To compile it as a module, choose M here: the module will be
7 called irnet. IrNET is a PPP driver, so you will also need a
8 working PPP subsystem (driver, daemon and config)...
9
10 IrNET is an alternate way to transfer TCP/IP traffic over IrDA. It
11 uses synchronous PPP over a set of point to point IrDA sockets. You
12 can use it between Linux machine or with W2k.
13
diff --git a/net/irda/irnet/Makefile b/net/irda/irnet/Makefile
new file mode 100644
index 000000000000..b3ee01e0def3
--- /dev/null
+++ b/net/irda/irnet/Makefile
@@ -0,0 +1,7 @@
1#
2# Makefile for the Linux IrDA IrNET protocol layer.
3#
4
5obj-$(CONFIG_IRNET) += irnet.o
6
7irnet-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 000000000000..9004f7349a76
--- /dev/null
+++ b/net/irda/irnet/irnet.h
@@ -0,0 +1,529 @@
1/*
2 * IrNET protocol module : Synchronous PPP over an IrDA socket.
3 *
4 * Jean II - HPL `00 - <jt@hpl.hp.com>
5 *
6 * This file contains definitions and declarations global to the IrNET module,
7 * all grouped in one place...
8 * This file is a *private* header, so other modules don't want to know
9 * what's in there...
10 *
11 * Note : as most part of the Linux kernel, this module is available
12 * under the GNU General Public License (GPL).
13 */
14
15#ifndef IRNET_H
16#define IRNET_H
17
18/************************** DOCUMENTATION ***************************/
19/*
20 * What is IrNET
21 * -------------
22 * IrNET is a protocol allowing to carry TCP/IP traffic between two
23 * IrDA peers in an efficient fashion. It is a thin layer, passing PPP
24 * packets to IrTTP and vice versa. It uses PPP in synchronous mode,
25 * because IrTTP offer a reliable sequenced packet service (as opposed
26 * to a byte stream). In fact, you could see IrNET as carrying TCP/IP
27 * in a IrDA socket, using PPP to provide the glue.
28 *
29 * The main difference with traditional PPP over IrCOMM is that we
30 * avoid the framing and serial emulation which are a performance
31 * bottleneck. It also allows multipoint communications in a sensible
32 * fashion.
33 *
34 * The main difference with IrLAN is that we use PPP for the link
35 * management, which is more standard, interoperable and flexible than
36 * the IrLAN protocol. For example, PPP adds authentication,
37 * encryption, compression, header compression and automated routing
38 * setup. And, as IrNET let PPP do the hard work, the implementation
39 * is much simpler than IrLAN.
40 *
41 * The Linux implementation
42 * ------------------------
43 * IrNET is written on top of the Linux-IrDA stack, and interface with
44 * the generic Linux PPP driver. Because IrNET depend on recent
45 * changes of the PPP driver interface, IrNET will work only with very
46 * recent kernel (2.3.99-pre6 and up).
47 *
48 * The present implementation offer the following features :
49 * o simple user interface using pppd
50 * o efficient implementation (interface directly to PPP and IrTTP)
51 * o addressing (you can specify the name of the IrNET recipient)
52 * o multipoint operation (limited by IrLAP specification)
53 * o information in /proc/net/irda/irnet
54 * o IrNET events on /dev/irnet (for user space daemon)
55 * o IrNET daemon (irnetd) to automatically handle incoming requests
56 * o Windows 2000 compatibility (tested, but need more work)
57 * Currently missing :
58 * o Lot's of testing (that's your job)
59 * o Connection retries (may be too hard to do)
60 * o Check pppd persist mode
61 * o User space daemon (to automatically handle incoming requests)
62 *
63 * The setup is not currently the most easy, but this should get much
64 * better when everything will get integrated...
65 *
66 * Acknowledgements
67 * ----------------
68 * This module is based on :
69 * o The PPP driver (ppp_synctty/ppp_generic) by Paul Mackerras
70 * o The IrLAN protocol (irlan_common/XXX) by Dag Brattli
71 * o The IrSock interface (af_irda) by Dag Brattli
72 * o Some other bits from the kernel and my drivers...
73 * Infinite thanks to those brave souls for providing the infrastructure
74 * upon which IrNET is built.
75 *
76 * Thanks to all my collegues in HP for helping me. In particular,
77 * thanks to Salil Pradhan and Bill Serra for W2k testing...
78 * Thanks to Luiz Magalhaes for irnetd and much testing...
79 *
80 * Thanks to Alan Cox for answering lot's of my stupid questions, and
81 * to Paul Mackerras answering my questions on how to best integrate
82 * IrNET and pppd.
83 *
84 * Jean II
85 *
86 * Note on some implementations choices...
87 * ------------------------------------
88 * 1) Direct interface vs tty/socket
89 * I could have used a tty interface to hook to ppp and use the full
90 * socket API to connect to IrDA. The code would have been easier to
91 * maintain, and maybe the code would have been smaller...
92 * Instead, we hook directly to ppp_generic and to IrTTP, which make
93 * things more complicated...
94 *
95 * The first reason is flexibility : this allow us to create IrNET
96 * instances on demand (no /dev/ircommX crap) and to allow linkname
97 * specification on pppd command line...
98 *
99 * Second reason is speed optimisation. If you look closely at the
100 * transmit and receive paths, you will notice that they are "super lean"
101 * (that's why they look ugly), with no function calls and as little data
102 * copy and modification as I could...
103 *
104 * 2) irnetd in user space
105 * irnetd is implemented in user space, which is necessary to call pppd.
106 * This also give maximum benefits in term of flexibility and customability,
107 * and allow to offer the event channel, useful for other stuff like debug.
108 *
109 * On the other hand, this require a loose coordination between the
110 * present module and irnetd. One critical area is how incoming request
111 * are handled.
112 * When irnet receive an incoming request, it send an event to irnetd and
113 * drop the incoming IrNET socket.
114 * irnetd start a pppd instance, which create a new IrNET socket. This new
115 * socket is then connected in the originating node to the pppd instance.
116 * At this point, in the originating node, the first socket is closed.
117 *
118 * I admit, this is a bit messy and waste some resources. The alternative
119 * is caching incoming socket, and that's also quite messy and waste
120 * resources.
121 * We also make connection time slower. For example, on a 115 kb/s link it
122 * adds 60ms to the connection time (770 ms). However, this is slower than
123 * the time it takes to fire up pppd on my P133...
124 *
125 *
126 * History :
127 * -------
128 *
129 * v1 - 15.5.00 - Jean II
130 * o Basic IrNET (hook to ppp_generic & IrTTP - incl. multipoint)
131 * o control channel on /dev/irnet (set name/address)
132 * o event channel on /dev/irnet (for user space daemon)
133 *
134 * v2 - 5.6.00 - Jean II
135 * o Enable DROP_NOT_READY to avoid PPP timeouts & other weirdness...
136 * o Add DISCONNECT_TO event and rename DISCONNECT_FROM.
137 * o Set official device number alloaction on /dev/irnet
138 *
139 * v3 - 30.8.00 - Jean II
140 * o Update to latest Linux-IrDA changes :
141 * - queue_t => irda_queue_t
142 * o Update to ppp-2.4.0 :
143 * - move irda_irnet_connect from PPPIOCATTACH to TIOCSETD
144 * o Add EXPIRE event (depend on new IrDA-Linux patch)
145 * o Switch from `hashbin_remove' to `hashbin_remove_this' to fix
146 * a multilink bug... (depend on new IrDA-Linux patch)
147 * o fix a self->daddr to self->raddr in irda_irnet_connect to fix
148 * another multilink bug (darn !)
149 * o Remove LINKNAME_IOCTL cruft
150 *
151 * v3b - 31.8.00 - Jean II
152 * o Dump discovery log at event channel startup
153 *
154 * v4 - 28.9.00 - Jean II
155 * o Fix interaction between poll/select and dump discovery log
156 * o Add IRNET_BLOCKED_LINK event (depend on new IrDA-Linux patch)
157 * o Add IRNET_NOANSWER_FROM event (mostly to help support)
158 * o Release flow control in disconnect_indication
159 * o Block packets while connecting (speed up connections)
160 *
161 * v5 - 11.01.01 - Jean II
162 * o Init self->max_header_size, just in case...
163 * o Set up ap->chan.hdrlen, to get zero copy on tx side working.
164 * o avoid tx->ttp->flow->ppp->tx->... loop, by checking flow state
165 * Thanks to Christian Gennerat for finding this bug !
166 * ---
167 * o Declare the proper MTU/MRU that we can support
168 * (but PPP doesn't read the MTU value :-()
169 * o Declare hashbin HB_NOLOCK instead of HB_LOCAL to avoid
170 * disabling and enabling irq twice
171 *
172 * v6 - 31.05.01 - Jean II
173 * o Print source address in Found, Discovery, Expiry & Request events
174 * o Print requested source address in /proc/net/irnet
175 * o Change control channel input. Allow multiple commands in one line.
176 * o Add saddr command to change ap->rsaddr (and use that in IrDA)
177 * ---
178 * o Make the IrDA connection procedure totally asynchronous.
179 * Heavy rewrite of the IAS query code and the whole connection
180 * procedure. Now, irnet_connect() no longer need to be called from
181 * a process context...
182 * o Enable IrDA connect retries in ppp_irnet_send(). The good thing
183 * is that IrDA connect retries are directly driven by PPP LCP
184 * retries (we retry for each LCP packet), so that everything
185 * is transparently controlled from pppd lcp-max-configure.
186 * o Add ttp_connect flag to prevent rentry on the connect procedure
187 * o Test and fixups to eliminate side effects of retries
188 *
189 * v7 - 22.08.01 - Jean II
190 * o Cleanup : Change "saddr = 0x0" to "saddr = DEV_ADDR_ANY"
191 * o Fix bug in BLOCK_WHEN_CONNECT introduced in v6 : due to the
192 * asynchronous IAS query, self->tsap is NULL when PPP send the
193 * first packet. This was preventing "connect-delay 0" to work.
194 * Change the test in ppp_irnet_send() to self->ttp_connect.
195 *
196 * v8 - 1.11.01 - Jean II
197 * o Tighten the use of self->ttp_connect and self->ttp_open to
198 * prevent various race conditions.
199 * o Avoid leaking discovery log and skb
200 * o Replace "self" with "server" in irnet_connect_indication() to
201 * better detect cut'n'paste error ;-)
202 *
203 * v9 - 29.11.01 - Jean II
204 * o Fix event generation in disconnect indication that I broke in v8
205 * It was always generation "No-Answer" because I was testing ttp_open
206 * just after clearing it. *blush*.
207 * o Use newly created irttp_listen() to fix potential crash when LAP
208 * destroyed before irnet module removed.
209 *
210 * v10 - 4.3.2 - Jean II
211 * o When receiving a disconnect indication, don't reenable the
212 * PPP Tx queue, this will trigger a reconnect. Instead, close
213 * the channel, which will kill pppd...
214 *
215 * v11 - 20.3.02 - Jean II
216 * o Oops ! v10 fix disabled IrNET retries and passive behaviour.
217 * Better fix in irnet_disconnect_indication() :
218 * - if connected, kill pppd via hangup.
219 * - if not connected, reenable ppp Tx, which trigger IrNET retry.
220 *
221 * v12 - 10.4.02 - Jean II
222 * o Fix race condition in irnet_connect_indication().
223 * If the socket was already trying to connect, drop old connection
224 * and use new one only if acting as primary. See comments.
225 *
226 * v13 - 30.5.02 - Jean II
227 * o Update module init code
228 *
229 * v14 - 20.2.03 - Jean II
230 * o Add discovery hint bits in the control channel.
231 * o Remove obsolete MOD_INC/DEC_USE_COUNT in favor of .owner
232 *
233 * v15 - 7.4.03 - Jean II
234 * o Replace spin_lock_irqsave() with spin_lock_bh() so that we can
235 * use ppp_unit_number(). It's probably also better overall...
236 * o Disable call to ppp_unregister_channel(), because we can't do it.
237 */
238
239/***************************** INCLUDES *****************************/
240
241#include <linux/module.h>
242
243#include <linux/kernel.h>
244#include <linux/skbuff.h>
245#include <linux/tty.h>
246#include <linux/proc_fs.h>
247#include <linux/devfs_fs_kernel.h>
248#include <linux/netdevice.h>
249#include <linux/miscdevice.h>
250#include <linux/poll.h>
251#include <linux/config.h>
252#include <linux/ctype.h> /* isspace() */
253#include <asm/uaccess.h>
254#include <linux/init.h>
255
256#include <linux/ppp_defs.h>
257#include <linux/if_ppp.h>
258#include <linux/ppp_channel.h>
259
260#include <net/irda/irda.h>
261#include <net/irda/iriap.h>
262#include <net/irda/irias_object.h>
263#include <net/irda/irlmp.h>
264#include <net/irda/irttp.h>
265#include <net/irda/discovery.h>
266
267/***************************** OPTIONS *****************************/
268/*
269 * Define or undefine to compile or not some optional part of the
270 * IrNET driver...
271 * Note : the present defaults make sense, play with that at your
272 * own risk...
273 */
274/* IrDA side of the business... */
275#define DISCOVERY_NOMASK /* To enable W2k compatibility... */
276#define ADVERTISE_HINT /* Advertise IrLAN hint bit */
277#define ALLOW_SIMULT_CONNECT /* This seem to work, cross fingers... */
278#define DISCOVERY_EVENTS /* Query the discovery log to post events */
279#define INITIAL_DISCOVERY /* Dump current discovery log as events */
280#undef STREAM_COMPAT /* Not needed - potentially messy */
281#undef CONNECT_INDIC_KICK /* Might mess IrDA, not needed */
282#undef FAIL_SEND_DISCONNECT /* Might mess IrDA, not needed */
283#undef PASS_CONNECT_PACKETS /* Not needed ? Safe */
284#undef MISSING_PPP_API /* Stuff I wish I could do */
285
286/* PPP side of the business */
287#define BLOCK_WHEN_CONNECT /* Block packets when connecting */
288#define CONNECT_IN_SEND /* Retry IrDA connection procedure */
289#undef FLUSH_TO_PPP /* Not sure about this one, let's play safe */
290#undef SECURE_DEVIRNET /* Bah... */
291
292/****************************** DEBUG ******************************/
293
294/*
295 * This set of flags enable and disable all the various warning,
296 * error and debug message of this driver.
297 * Each section can be enabled and disabled independently
298 */
299/* In the PPP part */
300#define DEBUG_CTRL_TRACE 0 /* Control channel */
301#define DEBUG_CTRL_INFO 0 /* various info */
302#define DEBUG_CTRL_ERROR 1 /* problems */
303#define DEBUG_FS_TRACE 0 /* filesystem callbacks */
304#define DEBUG_FS_INFO 0 /* various info */
305#define DEBUG_FS_ERROR 1 /* problems */
306#define DEBUG_PPP_TRACE 0 /* PPP related functions */
307#define DEBUG_PPP_INFO 0 /* various info */
308#define DEBUG_PPP_ERROR 1 /* problems */
309#define DEBUG_MODULE_TRACE 0 /* module insertion/removal */
310#define DEBUG_MODULE_ERROR 1 /* problems */
311
312/* In the IrDA part */
313#define DEBUG_IRDA_SR_TRACE 0 /* IRDA subroutines */
314#define DEBUG_IRDA_SR_INFO 0 /* various info */
315#define DEBUG_IRDA_SR_ERROR 1 /* problems */
316#define DEBUG_IRDA_SOCK_TRACE 0 /* IRDA main socket functions */
317#define DEBUG_IRDA_SOCK_INFO 0 /* various info */
318#define DEBUG_IRDA_SOCK_ERROR 1 /* problems */
319#define DEBUG_IRDA_SERV_TRACE 0 /* The IrNET server */
320#define DEBUG_IRDA_SERV_INFO 0 /* various info */
321#define DEBUG_IRDA_SERV_ERROR 1 /* problems */
322#define DEBUG_IRDA_TCB_TRACE 0 /* IRDA IrTTP callbacks */
323#define DEBUG_IRDA_CB_INFO 0 /* various info */
324#define DEBUG_IRDA_CB_ERROR 1 /* problems */
325#define DEBUG_IRDA_OCB_TRACE 0 /* IRDA other callbacks */
326#define DEBUG_IRDA_OCB_INFO 0 /* various info */
327#define DEBUG_IRDA_OCB_ERROR 1 /* problems */
328
329#define DEBUG_ASSERT 0 /* Verify all assertions */
330
331/*
332 * These are the macros we are using to actually print the debug
333 * statements. Don't look at it, it's ugly...
334 *
335 * One of the trick is that, as the DEBUG_XXX are constant, the
336 * compiler will optimise away the if() in all cases.
337 */
338/* All error messages (will show up in the normal logs) */
339#define DERROR(dbg, format, args...) \
340 {if(DEBUG_##dbg) \
341 printk(KERN_INFO "irnet: %s(): " format, __FUNCTION__ , ##args);}
342
343/* Normal debug message (will show up in /var/log/debug) */
344#define DEBUG(dbg, format, args...) \
345 {if(DEBUG_##dbg) \
346 printk(KERN_DEBUG "irnet: %s(): " format, __FUNCTION__ , ##args);}
347
348/* Entering a function (trace) */
349#define DENTER(dbg, format, args...) \
350 {if(DEBUG_##dbg) \
351 printk(KERN_DEBUG "irnet: -> %s" format, __FUNCTION__ , ##args);}
352
353/* Entering and exiting a function in one go (trace) */
354#define DPASS(dbg, format, args...) \
355 {if(DEBUG_##dbg) \
356 printk(KERN_DEBUG "irnet: <>%s" format, __FUNCTION__ , ##args);}
357
358/* Exiting a function (trace) */
359#define DEXIT(dbg, format, args...) \
360 {if(DEBUG_##dbg) \
361 printk(KERN_DEBUG "irnet: <-%s()" format, __FUNCTION__ , ##args);}
362
363/* Exit a function with debug */
364#define DRETURN(ret, dbg, args...) \
365 {DEXIT(dbg, ": " args);\
366 return ret; }
367
368/* Exit a function on failed condition */
369#define DABORT(cond, ret, dbg, args...) \
370 {if(cond) {\
371 DERROR(dbg, args);\
372 return ret; }}
373
374/* Invalid assertion, print out an error and exit... */
375#define DASSERT(cond, ret, dbg, args...) \
376 {if((DEBUG_ASSERT) && !(cond)) {\
377 DERROR(dbg, "Invalid assertion: " args);\
378 return ret; }}
379
380/************************ CONSTANTS & MACROS ************************/
381
382/* Paranoia */
383#define IRNET_MAGIC 0xB00754
384
385/* Number of control events in the control channel buffer... */
386#define IRNET_MAX_EVENTS 8 /* Should be more than enough... */
387
388/****************************** TYPES ******************************/
389
390/*
391 * This is the main structure where we store all the data pertaining to
392 * one instance of irnet.
393 * Note : in irnet functions, a pointer this structure is usually called
394 * "ap" or "self". If the code is borrowed from the IrDA stack, it tend
395 * to be called "self", and if it is borrowed from the PPP driver it is
396 * "ap". Apart from that, it's exactly the same structure ;-)
397 */
398typedef struct irnet_socket
399{
400 /* ------------------- Instance management ------------------- */
401 /* We manage a linked list of IrNET socket instances */
402 irda_queue_t q; /* Must be first - for hasbin */
403 int magic; /* Paranoia */
404
405 /* --------------------- FileSystem part --------------------- */
406 /* "pppd" interact directly with us on a /dev/ file */
407 struct file * file; /* File descriptor of this instance */
408 /* TTY stuff - to keep "pppd" happy */
409 struct termios termios; /* Various tty flags */
410 /* Stuff for the control channel */
411 int event_index; /* Last read in the event log */
412
413 /* ------------------------- PPP part ------------------------- */
414 /* We interface directly to the ppp_generic driver in the kernel */
415 int ppp_open; /* registered with ppp_generic */
416 struct ppp_channel chan; /* Interface to generic ppp layer */
417
418 int mru; /* Max size of PPP payload */
419 u32 xaccm[8]; /* Asynchronous character map (just */
420 u32 raccm; /* to please pppd - dummy) */
421 unsigned int flags; /* PPP flags (compression, ...) */
422 unsigned int rbits; /* Unused receive flags ??? */
423
424 /* ------------------------ IrTTP part ------------------------ */
425 /* We create a pseudo "socket" over the IrDA tranport */
426 unsigned long ttp_open; /* Set when IrTTP is ready */
427 unsigned long ttp_connect; /* Set when IrTTP is connecting */
428 struct tsap_cb * tsap; /* IrTTP instance (the connection) */
429
430 char rname[NICKNAME_MAX_LEN + 1];
431 /* IrDA nickname of destination */
432 __u32 rdaddr; /* Requested peer IrDA address */
433 __u32 rsaddr; /* Requested local IrDA address */
434 __u32 daddr; /* actual peer IrDA address */
435 __u32 saddr; /* my local IrDA address */
436 __u8 dtsap_sel; /* Remote TSAP selector */
437 __u8 stsap_sel; /* Local TSAP selector */
438
439 __u32 max_sdu_size_rx;/* Socket parameters used for IrTTP */
440 __u32 max_sdu_size_tx;
441 __u32 max_data_size;
442 __u8 max_header_size;
443 LOCAL_FLOW tx_flow; /* State of the Tx path in IrTTP */
444
445 /* ------------------- IrLMP and IrIAS part ------------------- */
446 /* Used for IrDA Discovery and socket name resolution */
447 void * ckey; /* IrLMP client handle */
448 __u16 mask; /* Hint bits mask (filter discov.)*/
449 int nslots; /* Number of slots for discovery */
450
451 struct iriap_cb * iriap; /* Used to query remote IAS */
452 int errno; /* status of the IAS query */
453
454 /* -------------------- Discovery log part -------------------- */
455 /* Used by initial discovery on the control channel
456 * and by irnet_discover_daddr_and_lsap_sel() */
457 struct irda_device_info *discoveries; /* Copy of the discovery log */
458 int disco_index; /* Last read in the discovery log */
459 int disco_number; /* Size of the discovery log */
460
461} irnet_socket;
462
463/*
464 * This is the various event that we will generate on the control channel
465 */
466typedef enum irnet_event
467{
468 IRNET_DISCOVER, /* New IrNET node discovered */
469 IRNET_EXPIRE, /* IrNET node expired */
470 IRNET_CONNECT_TO, /* IrNET socket has connected to other node */
471 IRNET_CONNECT_FROM, /* Other node has connected to IrNET socket */
472 IRNET_REQUEST_FROM, /* Non satisfied connection request */
473 IRNET_NOANSWER_FROM, /* Failed connection request */
474 IRNET_BLOCKED_LINK, /* Link (IrLAP) is blocked for > 3s */
475 IRNET_DISCONNECT_FROM, /* IrNET socket has disconnected */
476 IRNET_DISCONNECT_TO /* Closing IrNET socket */
477} irnet_event;
478
479/*
480 * This is the storage for an event and its arguments
481 */
482typedef struct irnet_log
483{
484 irnet_event event;
485 int unit;
486 __u32 saddr;
487 __u32 daddr;
488 char name[NICKNAME_MAX_LEN + 1]; /* 21 + 1 */
489 __u16_host_order hints; /* Discovery hint bits */
490} irnet_log;
491
492/*
493 * This is the storage for all events and related stuff...
494 */
495typedef struct irnet_ctrl_channel
496{
497 irnet_log log[IRNET_MAX_EVENTS]; /* Event log */
498 int index; /* Current index in log */
499 spinlock_t spinlock; /* Serialize access to the event log */
500 wait_queue_head_t rwait; /* processes blocked on read (or poll) */
501} irnet_ctrl_channel;
502
503/**************************** PROTOTYPES ****************************/
504/*
505 * Global functions of the IrNET module
506 * Note : we list here also functions called from one file to the other.
507 */
508
509/* -------------------------- IRDA PART -------------------------- */
510extern int
511 irda_irnet_create(irnet_socket *); /* Initialise a IrNET socket */
512extern int
513 irda_irnet_connect(irnet_socket *); /* Try to connect over IrDA */
514extern void
515 irda_irnet_destroy(irnet_socket *); /* Teardown a IrNET socket */
516extern int
517 irda_irnet_init(void); /* Initialise IrDA part of IrNET */
518extern void
519 irda_irnet_cleanup(void); /* Teardown IrDA part of IrNET */
520/* ---------------------------- MODULE ---------------------------- */
521extern int
522 irnet_init(void); /* Initialise IrNET module */
523
524/**************************** VARIABLES ****************************/
525
526/* Control channel stuff - allocated in irnet_irda.h */
527extern struct irnet_ctrl_channel irnet_events;
528
529#endif /* IRNET_H */
diff --git a/net/irda/irnet/irnet_irda.c b/net/irda/irnet/irnet_irda.c
new file mode 100644
index 000000000000..07ec326c71f5
--- /dev/null
+++ b/net/irda/irnet/irnet_irda.c
@@ -0,0 +1,1866 @@
1/*
2 * IrNET protocol module : Synchronous PPP over an IrDA socket.
3 *
4 * Jean II - HPL `00 - <jt@hpl.hp.com>
5 *
6 * This file implement the IRDA interface of IrNET.
7 * Basically, we sit on top of IrTTP. We set up IrTTP, IrIAS properly,
8 * and exchange frames with IrTTP.
9 */
10
11#include "irnet_irda.h" /* Private header */
12
13/************************* CONTROL CHANNEL *************************/
14/*
15 * When ppp is not active, /dev/irnet act as a control channel.
16 * Writing allow to set up the IrDA destination of the IrNET channel,
17 * and any application may be read events happening on IrNET...
18 */
19
20/*------------------------------------------------------------------*/
21/*
22 * Post an event to the control channel...
23 * Put the event in the log, and then wait all process blocked on read
24 * so they can read the log...
25 */
26static void
27irnet_post_event(irnet_socket * ap,
28 irnet_event event,
29 __u32 saddr,
30 __u32 daddr,
31 char * name,
32 __u16 hints)
33{
34 int index; /* In the log */
35
36 DENTER(CTRL_TRACE, "(ap=0x%p, event=%d, daddr=%08x, name=``%s'')\n",
37 ap, event, daddr, name);
38
39 /* Protect this section via spinlock.
40 * Note : as we are the only event producer, we only need to exclude
41 * ourself when touching the log, which is nice and easy.
42 */
43 spin_lock_bh(&irnet_events.spinlock);
44
45 /* Copy the event in the log */
46 index = irnet_events.index;
47 irnet_events.log[index].event = event;
48 irnet_events.log[index].daddr = daddr;
49 irnet_events.log[index].saddr = saddr;
50 /* Try to copy IrDA nickname */
51 if(name)
52 strcpy(irnet_events.log[index].name, name);
53 else
54 irnet_events.log[index].name[0] = '\0';
55 /* Copy hints */
56 irnet_events.log[index].hints.word = hints;
57 /* Try to get ppp unit number */
58 if((ap != (irnet_socket *) NULL) && (ap->ppp_open))
59 irnet_events.log[index].unit = ppp_unit_number(&ap->chan);
60 else
61 irnet_events.log[index].unit = -1;
62
63 /* Increment the index
64 * Note that we increment the index only after the event is written,
65 * to make sure that the readers don't get garbage... */
66 irnet_events.index = (index + 1) % IRNET_MAX_EVENTS;
67
68 DEBUG(CTRL_INFO, "New event index is %d\n", irnet_events.index);
69
70 /* Spin lock end */
71 spin_unlock_bh(&irnet_events.spinlock);
72
73 /* Now : wake up everybody waiting for events... */
74 wake_up_interruptible_all(&irnet_events.rwait);
75
76 DEXIT(CTRL_TRACE, "\n");
77}
78
79/************************* IRDA SUBROUTINES *************************/
80/*
81 * These are a bunch of subroutines called from other functions
82 * down there, mostly common code or to improve readability...
83 *
84 * Note : we duplicate quite heavily some routines of af_irda.c,
85 * because our input structure (self) is quite different
86 * (struct irnet instead of struct irda_sock), which make sharing
87 * the same code impossible (at least, without templates).
88 */
89
90/*------------------------------------------------------------------*/
91/*
92 * Function irda_open_tsap (self)
93 *
94 * Open local Transport Service Access Point (TSAP)
95 *
96 * Create a IrTTP instance for us and set all the IrTTP callbacks.
97 */
98static inline int
99irnet_open_tsap(irnet_socket * self)
100{
101 notify_t notify; /* Callback structure */
102
103 DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
104
105 DABORT(self->tsap != NULL, -EBUSY, IRDA_SR_ERROR, "Already busy !\n");
106
107 /* Initialize IrTTP callbacks to be used by the IrDA stack */
108 irda_notify_init(&notify);
109 notify.connect_confirm = irnet_connect_confirm;
110 notify.connect_indication = irnet_connect_indication;
111 notify.disconnect_indication = irnet_disconnect_indication;
112 notify.data_indication = irnet_data_indication;
113 /*notify.udata_indication = NULL;*/
114 notify.flow_indication = irnet_flow_indication;
115 notify.status_indication = irnet_status_indication;
116 notify.instance = self;
117 strlcpy(notify.name, IRNET_NOTIFY_NAME, sizeof(notify.name));
118
119 /* Open an IrTTP instance */
120 self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
121 &notify);
122 DABORT(self->tsap == NULL, -ENOMEM,
123 IRDA_SR_ERROR, "Unable to allocate TSAP !\n");
124
125 /* Remember which TSAP selector we actually got */
126 self->stsap_sel = self->tsap->stsap_sel;
127
128 DEXIT(IRDA_SR_TRACE, " - tsap=0x%p, sel=0x%X\n",
129 self->tsap, self->stsap_sel);
130 return 0;
131}
132
133/*------------------------------------------------------------------*/
134/*
135 * Function irnet_ias_to_tsap (self, result, value)
136 *
137 * Examine an IAS object and extract TSAP
138 *
139 * We do an IAP query to find the TSAP associated with the IrNET service.
140 * When IrIAP pass us the result of the query, this function look at
141 * the return values to check for failures and extract the TSAP if
142 * possible.
143 * Also deallocate value
144 * The failure is in self->errno
145 * Return TSAP or -1
146 */
147static inline __u8
148irnet_ias_to_tsap(irnet_socket * self,
149 int result,
150 struct ias_value * value)
151{
152 __u8 dtsap_sel = 0; /* TSAP we are looking for */
153
154 DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
155
156 /* By default, no error */
157 self->errno = 0;
158
159 /* Check if request succeeded */
160 switch(result)
161 {
162 /* Standard errors : service not available */
163 case IAS_CLASS_UNKNOWN:
164 case IAS_ATTRIB_UNKNOWN:
165 DEBUG(IRDA_SR_INFO, "IAS object doesn't exist ! (%d)\n", result);
166 self->errno = -EADDRNOTAVAIL;
167 break;
168
169 /* Other errors, most likely IrDA stack failure */
170 default :
171 DEBUG(IRDA_SR_INFO, "IAS query failed ! (%d)\n", result);
172 self->errno = -EHOSTUNREACH;
173 break;
174
175 /* Success : we got what we wanted */
176 case IAS_SUCCESS:
177 break;
178 }
179
180 /* Check what was returned to us */
181 if(value != NULL)
182 {
183 /* What type of argument have we got ? */
184 switch(value->type)
185 {
186 case IAS_INTEGER:
187 DEBUG(IRDA_SR_INFO, "result=%d\n", value->t.integer);
188 if(value->t.integer != -1)
189 /* Get the remote TSAP selector */
190 dtsap_sel = value->t.integer;
191 else
192 self->errno = -EADDRNOTAVAIL;
193 break;
194 default:
195 self->errno = -EADDRNOTAVAIL;
196 DERROR(IRDA_SR_ERROR, "bad type ! (0x%X)\n", value->type);
197 break;
198 }
199
200 /* Cleanup */
201 irias_delete_value(value);
202 }
203 else /* value == NULL */
204 {
205 /* Nothing returned to us - usually result != SUCCESS */
206 if(!(self->errno))
207 {
208 DERROR(IRDA_SR_ERROR,
209 "IrDA bug : result == SUCCESS && value == NULL\n");
210 self->errno = -EHOSTUNREACH;
211 }
212 }
213 DEXIT(IRDA_SR_TRACE, "\n");
214
215 /* Return the TSAP */
216 return(dtsap_sel);
217}
218
219/*------------------------------------------------------------------*/
220/*
221 * Function irnet_find_lsap_sel (self)
222 *
223 * Try to lookup LSAP selector in remote LM-IAS
224 *
225 * Basically, we start a IAP query, and then go to sleep. When the query
226 * return, irnet_getvalue_confirm will wake us up, and we can examine the
227 * result of the query...
228 * Note that in some case, the query fail even before we go to sleep,
229 * creating some races...
230 */
231static inline int
232irnet_find_lsap_sel(irnet_socket * self)
233{
234 DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
235
236 /* This should not happen */
237 DABORT(self->iriap, -EBUSY, IRDA_SR_ERROR, "busy with a previous query.\n");
238
239 /* Create an IAP instance, will be closed in irnet_getvalue_confirm() */
240 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
241 irnet_getvalue_confirm);
242
243 /* Treat unexpected signals as disconnect */
244 self->errno = -EHOSTUNREACH;
245
246 /* Query remote LM-IAS */
247 iriap_getvaluebyclass_request(self->iriap, self->rsaddr, self->daddr,
248 IRNET_SERVICE_NAME, IRNET_IAS_VALUE);
249
250 /* The above request is non-blocking.
251 * After a while, IrDA will call us back in irnet_getvalue_confirm()
252 * We will then call irnet_ias_to_tsap() and finish the
253 * connection procedure */
254
255 DEXIT(IRDA_SR_TRACE, "\n");
256 return 0;
257}
258
259/*------------------------------------------------------------------*/
260/*
261 * Function irnet_connect_tsap (self)
262 *
263 * Initialise the TTP socket and initiate TTP connection
264 *
265 */
266static inline int
267irnet_connect_tsap(irnet_socket * self)
268{
269 int err;
270
271 DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
272
273 /* Open a local TSAP (an IrTTP instance) */
274 err = irnet_open_tsap(self);
275 if(err != 0)
276 {
277 clear_bit(0, &self->ttp_connect);
278 DERROR(IRDA_SR_ERROR, "connect aborted!\n");
279 return(err);
280 }
281
282 /* Connect to remote device */
283 err = irttp_connect_request(self->tsap, self->dtsap_sel,
284 self->rsaddr, self->daddr, NULL,
285 self->max_sdu_size_rx, NULL);
286 if(err != 0)
287 {
288 clear_bit(0, &self->ttp_connect);
289 DERROR(IRDA_SR_ERROR, "connect aborted!\n");
290 return(err);
291 }
292
293 /* The above call is non-blocking.
294 * After a while, the IrDA stack will either call us back in
295 * irnet_connect_confirm() or irnet_disconnect_indication()
296 * See you there ;-) */
297
298 DEXIT(IRDA_SR_TRACE, "\n");
299 return(err);
300}
301
302/*------------------------------------------------------------------*/
303/*
304 * Function irnet_discover_next_daddr (self)
305 *
306 * Query the IrNET TSAP of the next device in the log.
307 *
308 * Used in the TSAP discovery procedure.
309 */
310static inline int
311irnet_discover_next_daddr(irnet_socket * self)
312{
313 /* Close the last instance of IrIAP, and open a new one.
314 * We can't reuse the IrIAP instance in the IrIAP callback */
315 if(self->iriap)
316 {
317 iriap_close(self->iriap);
318 self->iriap = NULL;
319 }
320 /* Create a new IAP instance */
321 self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
322 irnet_discovervalue_confirm);
323 if(self->iriap == NULL)
324 return -ENOMEM;
325
326 /* Next discovery - before the call to avoid races */
327 self->disco_index++;
328
329 /* Check if we have one more address to try */
330 if(self->disco_index < self->disco_number)
331 {
332 /* Query remote LM-IAS */
333 iriap_getvaluebyclass_request(self->iriap,
334 self->discoveries[self->disco_index].saddr,
335 self->discoveries[self->disco_index].daddr,
336 IRNET_SERVICE_NAME, IRNET_IAS_VALUE);
337 /* The above request is non-blocking.
338 * After a while, IrDA will call us back in irnet_discovervalue_confirm()
339 * We will then call irnet_ias_to_tsap() and come back here again... */
340 return(0);
341 }
342 else
343 return(1);
344}
345
346/*------------------------------------------------------------------*/
347/*
348 * Function irnet_discover_daddr_and_lsap_sel (self)
349 *
350 * This try to find a device with the requested service.
351 *
352 * Initiate a TSAP discovery procedure.
353 * It basically look into the discovery log. For each address in the list,
354 * it queries the LM-IAS of the device to find if this device offer
355 * the requested service.
356 * If there is more than one node supporting the service, we complain
357 * to the user (it should move devices around).
358 * If we find one node which have the requested TSAP, we connect to it.
359 *
360 * This function just start the whole procedure. It request the discovery
361 * log and submit the first IAS query.
362 * The bulk of the job is handled in irnet_discovervalue_confirm()
363 *
364 * Note : this procedure fails if there is more than one device in range
365 * on the same dongle, because IrLMP doesn't disconnect the LAP when the
366 * last LSAP is closed. Moreover, we would need to wait the LAP
367 * disconnection...
368 */
369static inline int
370irnet_discover_daddr_and_lsap_sel(irnet_socket * self)
371{
372 int ret;
373
374 DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
375
376 /* Ask lmp for the current discovery log */
377 self->discoveries = irlmp_get_discoveries(&self->disco_number, self->mask,
378 DISCOVERY_DEFAULT_SLOTS);
379
380 /* Check if the we got some results */
381 if(self->discoveries == NULL)
382 {
383 self->disco_number = -1;
384 clear_bit(0, &self->ttp_connect);
385 DRETURN(-ENETUNREACH, IRDA_SR_INFO, "No Cachelog...\n");
386 }
387 DEBUG(IRDA_SR_INFO, "Got the log (0x%p), size is %d\n",
388 self->discoveries, self->disco_number);
389
390 /* Start with the first discovery */
391 self->disco_index = -1;
392 self->daddr = DEV_ADDR_ANY;
393
394 /* This will fail if the log is empty - this is non-blocking */
395 ret = irnet_discover_next_daddr(self);
396 if(ret)
397 {
398 /* Close IAP */
399 if(self->iriap)
400 iriap_close(self->iriap);
401 self->iriap = NULL;
402
403 /* Cleanup our copy of the discovery log */
404 kfree(self->discoveries);
405 self->discoveries = NULL;
406
407 clear_bit(0, &self->ttp_connect);
408 DRETURN(-ENETUNREACH, IRDA_SR_INFO, "Cachelog empty...\n");
409 }
410
411 /* Follow me in irnet_discovervalue_confirm() */
412
413 DEXIT(IRDA_SR_TRACE, "\n");
414 return(0);
415}
416
417/*------------------------------------------------------------------*/
418/*
419 * Function irnet_dname_to_daddr (self)
420 *
421 * Convert an IrDA nickname to a valid IrDA address
422 *
423 * It basically look into the discovery log until there is a match.
424 */
425static inline int
426irnet_dname_to_daddr(irnet_socket * self)
427{
428 struct irda_device_info *discoveries; /* Copy of the discovery log */
429 int number; /* Number of nodes in the log */
430 int i;
431
432 DENTER(IRDA_SR_TRACE, "(self=0x%p)\n", self);
433
434 /* Ask lmp for the current discovery log */
435 discoveries = irlmp_get_discoveries(&number, 0xffff,
436 DISCOVERY_DEFAULT_SLOTS);
437 /* Check if the we got some results */
438 if(discoveries == NULL)
439 DRETURN(-ENETUNREACH, IRDA_SR_INFO, "Cachelog empty...\n");
440
441 /*
442 * Now, check all discovered devices (if any), and connect
443 * client only about the services that the client is
444 * interested in...
445 */
446 for(i = 0; i < number; i++)
447 {
448 /* Does the name match ? */
449 if(!strncmp(discoveries[i].info, self->rname, NICKNAME_MAX_LEN))
450 {
451 /* Yes !!! Get it.. */
452 self->daddr = discoveries[i].daddr;
453 DEBUG(IRDA_SR_INFO, "discovered device ``%s'' at address 0x%08x.\n",
454 self->rname, self->daddr);
455 kfree(discoveries);
456 DEXIT(IRDA_SR_TRACE, "\n");
457 return 0;
458 }
459 }
460 /* No luck ! */
461 DEBUG(IRDA_SR_INFO, "cannot discover device ``%s'' !!!\n", self->rname);
462 kfree(discoveries);
463 return(-EADDRNOTAVAIL);
464}
465
466
467/************************* SOCKET ROUTINES *************************/
468/*
469 * This are the main operations on IrNET sockets, basically to create
470 * and destroy IrNET sockets. These are called from the PPP part...
471 */
472
473/*------------------------------------------------------------------*/
474/*
475 * Create a IrNET instance : just initialise some parameters...
476 */
477int
478irda_irnet_create(irnet_socket * self)
479{
480 DENTER(IRDA_SOCK_TRACE, "(self=0x%p)\n", self);
481
482 self->magic = IRNET_MAGIC; /* Paranoia */
483
484 self->ttp_open = 0; /* Prevent higher layer from accessing IrTTP */
485 self->ttp_connect = 0; /* Not connecting yet */
486 self->rname[0] = '\0'; /* May be set via control channel */
487 self->rdaddr = DEV_ADDR_ANY; /* May be set via control channel */
488 self->rsaddr = DEV_ADDR_ANY; /* May be set via control channel */
489 self->daddr = DEV_ADDR_ANY; /* Until we get connected */
490 self->saddr = DEV_ADDR_ANY; /* Until we get connected */
491 self->max_sdu_size_rx = TTP_SAR_UNBOUND;
492
493 /* Register as a client with IrLMP */
494 self->ckey = irlmp_register_client(0, NULL, NULL, NULL);
495#ifdef DISCOVERY_NOMASK
496 self->mask = 0xffff; /* For W2k compatibility */
497#else /* DISCOVERY_NOMASK */
498 self->mask = irlmp_service_to_hint(S_LAN);
499#endif /* DISCOVERY_NOMASK */
500 self->tx_flow = FLOW_START; /* Flow control from IrTTP */
501
502 DEXIT(IRDA_SOCK_TRACE, "\n");
503 return(0);
504}
505
506/*------------------------------------------------------------------*/
507/*
508 * Connect to the other side :
509 * o convert device name to an address
510 * o find the socket number (dlsap)
511 * o Establish the connection
512 *
513 * Note : We no longer mimic af_irda. The IAS query for finding the TSAP
514 * is done asynchronously, like the TTP connection. This allow us to
515 * call this function from any context (not only process).
516 * The downside is that following what's happening in there is tricky
517 * because it involve various functions all over the place...
518 */
519int
520irda_irnet_connect(irnet_socket * self)
521{
522 int err;
523
524 DENTER(IRDA_SOCK_TRACE, "(self=0x%p)\n", self);
525
526 /* Check if we are already trying to connect.
527 * Because irda_irnet_connect() can be called directly by pppd plus
528 * packet retries in ppp_generic and connect may take time, plus we may
529 * race with irnet_connect_indication(), we need to be careful there... */
530 if(test_and_set_bit(0, &self->ttp_connect))
531 DRETURN(-EBUSY, IRDA_SOCK_INFO, "Already connecting...\n");
532 if((self->iriap != NULL) || (self->tsap != NULL))
533 DERROR(IRDA_SOCK_ERROR, "Socket not cleaned up...\n");
534
535 /* Insert ourselves in the hashbin so that the IrNET server can find us.
536 * Notes : 4th arg is string of 32 char max and must be null terminated
537 * When 4th arg is used (string), 3rd arg isn't (int)
538 * Can't re-insert (MUST remove first) so check for that... */
539 if((irnet_server.running) && (self->q.q_next == NULL))
540 {
541 spin_lock_bh(&irnet_server.spinlock);
542 hashbin_insert(irnet_server.list, (irda_queue_t *) self, 0, self->rname);
543 spin_unlock_bh(&irnet_server.spinlock);
544 DEBUG(IRDA_SOCK_INFO, "Inserted ``%s'' in hashbin...\n", self->rname);
545 }
546
547 /* If we don't have anything (no address, no name) */
548 if((self->rdaddr == DEV_ADDR_ANY) && (self->rname[0] == '\0'))
549 {
550 /* Try to find a suitable address */
551 if((err = irnet_discover_daddr_and_lsap_sel(self)) != 0)
552 DRETURN(err, IRDA_SOCK_INFO, "auto-connect failed!\n");
553 /* In most cases, the call above is non-blocking */
554 }
555 else
556 {
557 /* If we have only the name (no address), try to get an address */
558 if(self->rdaddr == DEV_ADDR_ANY)
559 {
560 if((err = irnet_dname_to_daddr(self)) != 0)
561 DRETURN(err, IRDA_SOCK_INFO, "name connect failed!\n");
562 }
563 else
564 /* Use the requested destination address */
565 self->daddr = self->rdaddr;
566
567 /* Query remote LM-IAS to find LSAP selector */
568 irnet_find_lsap_sel(self);
569 /* The above call is non blocking */
570 }
571
572 /* At this point, we are waiting for the IrDA stack to call us back,
573 * or we have already failed.
574 * We will finish the connection procedure in irnet_connect_tsap().
575 */
576 DEXIT(IRDA_SOCK_TRACE, "\n");
577 return(0);
578}
579
580/*------------------------------------------------------------------*/
581/*
582 * Function irda_irnet_destroy(self)
583 *
584 * Destroy irnet instance
585 *
586 * Note : this need to be called from a process context.
587 */
588void
589irda_irnet_destroy(irnet_socket * self)
590{
591 DENTER(IRDA_SOCK_TRACE, "(self=0x%p)\n", self);
592 if(self == NULL)
593 return;
594
595 /* Remove ourselves from hashbin (if we are queued in hashbin)
596 * Note : `irnet_server.running' protect us from calls in hashbin_delete() */
597 if((irnet_server.running) && (self->q.q_next != NULL))
598 {
599 struct irnet_socket * entry;
600 DEBUG(IRDA_SOCK_INFO, "Removing from hash..\n");
601 spin_lock_bh(&irnet_server.spinlock);
602 entry = hashbin_remove_this(irnet_server.list, (irda_queue_t *) self);
603 self->q.q_next = NULL;
604 spin_unlock_bh(&irnet_server.spinlock);
605 DASSERT(entry == self, , IRDA_SOCK_ERROR, "Can't remove from hash.\n");
606 }
607
608 /* If we were connected, post a message */
609 if(test_bit(0, &self->ttp_open))
610 {
611 /* Note : as the disconnect comes from ppp_generic, the unit number
612 * doesn't exist anymore when we post the event, so we need to pass
613 * NULL as the first arg... */
614 irnet_post_event(NULL, IRNET_DISCONNECT_TO,
615 self->saddr, self->daddr, self->rname, 0);
616 }
617
618 /* Prevent various IrDA callbacks from messing up things
619 * Need to be first */
620 clear_bit(0, &self->ttp_connect);
621
622 /* Prevent higher layer from accessing IrTTP */
623 clear_bit(0, &self->ttp_open);
624
625 /* Unregister with IrLMP */
626 irlmp_unregister_client(self->ckey);
627
628 /* Unregister with LM-IAS */
629 if(self->iriap)
630 {
631 iriap_close(self->iriap);
632 self->iriap = NULL;
633 }
634
635 /* Cleanup eventual discoveries from connection attempt or control channel */
636 if(self->discoveries != NULL)
637 {
638 /* Cleanup our copy of the discovery log */
639 kfree(self->discoveries);
640 self->discoveries = NULL;
641 }
642
643 /* Close our IrTTP connection */
644 if(self->tsap)
645 {
646 DEBUG(IRDA_SOCK_INFO, "Closing our TTP connection.\n");
647 irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
648 irttp_close_tsap(self->tsap);
649 self->tsap = NULL;
650 }
651 self->stsap_sel = 0;
652
653 DEXIT(IRDA_SOCK_TRACE, "\n");
654 return;
655}
656
657
658/************************** SERVER SOCKET **************************/
659/*
660 * The IrNET service is composed of one server socket and a variable
661 * number of regular IrNET sockets. The server socket is supposed to
662 * handle incoming connections and redirect them to one IrNET sockets.
663 * It's a superset of the regular IrNET socket, but has a very distinct
664 * behaviour...
665 */
666
667/*------------------------------------------------------------------*/
668/*
669 * Function irnet_daddr_to_dname (self)
670 *
671 * Convert an IrDA address to a IrDA nickname
672 *
673 * It basically look into the discovery log until there is a match.
674 */
675static inline int
676irnet_daddr_to_dname(irnet_socket * self)
677{
678 struct irda_device_info *discoveries; /* Copy of the discovery log */
679 int number; /* Number of nodes in the log */
680 int i;
681
682 DENTER(IRDA_SERV_TRACE, "(self=0x%p)\n", self);
683
684 /* Ask lmp for the current discovery log */
685 discoveries = irlmp_get_discoveries(&number, 0xffff,
686 DISCOVERY_DEFAULT_SLOTS);
687 /* Check if the we got some results */
688 if (discoveries == NULL)
689 DRETURN(-ENETUNREACH, IRDA_SERV_INFO, "Cachelog empty...\n");
690
691 /* Now, check all discovered devices (if any) */
692 for(i = 0; i < number; i++)
693 {
694 /* Does the name match ? */
695 if(discoveries[i].daddr == self->daddr)
696 {
697 /* Yes !!! Get it.. */
698 strlcpy(self->rname, discoveries[i].info, sizeof(self->rname));
699 self->rname[NICKNAME_MAX_LEN + 1] = '\0';
700 DEBUG(IRDA_SERV_INFO, "Device 0x%08x is in fact ``%s''.\n",
701 self->daddr, self->rname);
702 kfree(discoveries);
703 DEXIT(IRDA_SERV_TRACE, "\n");
704 return 0;
705 }
706 }
707 /* No luck ! */
708 DEXIT(IRDA_SERV_INFO, ": cannot discover device 0x%08x !!!\n", self->daddr);
709 kfree(discoveries);
710 return(-EADDRNOTAVAIL);
711}
712
713/*------------------------------------------------------------------*/
714/*
715 * Function irda_find_socket (self)
716 *
717 * Find the correct IrNET socket
718 *
719 * Look into the list of IrNET sockets and finds one with the right
720 * properties...
721 */
722static inline irnet_socket *
723irnet_find_socket(irnet_socket * self)
724{
725 irnet_socket * new = (irnet_socket *) NULL;
726 int err;
727
728 DENTER(IRDA_SERV_TRACE, "(self=0x%p)\n", self);
729
730 /* Get the addresses of the requester */
731 self->daddr = irttp_get_daddr(self->tsap);
732 self->saddr = irttp_get_saddr(self->tsap);
733
734 /* Try to get the IrDA nickname of the requester */
735 err = irnet_daddr_to_dname(self);
736
737 /* Protect access to the instance list */
738 spin_lock_bh(&irnet_server.spinlock);
739
740 /* So now, try to get an socket having specifically
741 * requested that nickname */
742 if(err == 0)
743 {
744 new = (irnet_socket *) hashbin_find(irnet_server.list,
745 0, self->rname);
746 if(new)
747 DEBUG(IRDA_SERV_INFO, "Socket 0x%p matches rname ``%s''.\n",
748 new, new->rname);
749 }
750
751 /* If no name matches, try to find an socket by the destination address */
752 /* It can be either the requested destination address (set via the
753 * control channel), or the current destination address if the
754 * socket is in the middle of a connection request */
755 if(new == (irnet_socket *) NULL)
756 {
757 new = (irnet_socket *) hashbin_get_first(irnet_server.list);
758 while(new !=(irnet_socket *) NULL)
759 {
760 /* Does it have the same address ? */
761 if((new->rdaddr == self->daddr) || (new->daddr == self->daddr))
762 {
763 /* Yes !!! Get it.. */
764 DEBUG(IRDA_SERV_INFO, "Socket 0x%p matches daddr %#08x.\n",
765 new, self->daddr);
766 break;
767 }
768 new = (irnet_socket *) hashbin_get_next(irnet_server.list);
769 }
770 }
771
772 /* If we don't have any socket, get the first unconnected socket */
773 if(new == (irnet_socket *) NULL)
774 {
775 new = (irnet_socket *) hashbin_get_first(irnet_server.list);
776 while(new !=(irnet_socket *) NULL)
777 {
778 /* Is it available ? */
779 if(!(test_bit(0, &new->ttp_open)) && (new->rdaddr == DEV_ADDR_ANY) &&
780 (new->rname[0] == '\0') && (new->ppp_open))
781 {
782 /* Yes !!! Get it.. */
783 DEBUG(IRDA_SERV_INFO, "Socket 0x%p is free.\n",
784 new);
785 break;
786 }
787 new = (irnet_socket *) hashbin_get_next(irnet_server.list);
788 }
789 }
790
791 /* Spin lock end */
792 spin_unlock_bh(&irnet_server.spinlock);
793
794 DEXIT(IRDA_SERV_TRACE, " - new = 0x%p\n", new);
795 return new;
796}
797
798/*------------------------------------------------------------------*/
799/*
800 * Function irda_connect_socket (self)
801 *
802 * Connect an incoming connection to the socket
803 *
804 */
805static inline int
806irnet_connect_socket(irnet_socket * server,
807 irnet_socket * new,
808 struct qos_info * qos,
809 __u32 max_sdu_size,
810 __u8 max_header_size)
811{
812 DENTER(IRDA_SERV_TRACE, "(server=0x%p, new=0x%p)\n",
813 server, new);
814
815 /* Now attach up the new socket */
816 new->tsap = irttp_dup(server->tsap, new);
817 DABORT(new->tsap == NULL, -1, IRDA_SERV_ERROR, "dup failed!\n");
818
819 /* Set up all the relevant parameters on the new socket */
820 new->stsap_sel = new->tsap->stsap_sel;
821 new->dtsap_sel = new->tsap->dtsap_sel;
822 new->saddr = irttp_get_saddr(new->tsap);
823 new->daddr = irttp_get_daddr(new->tsap);
824
825 new->max_header_size = max_header_size;
826 new->max_sdu_size_tx = max_sdu_size;
827 new->max_data_size = max_sdu_size;
828#ifdef STREAM_COMPAT
829 /* If we want to receive "stream sockets" */
830 if(max_sdu_size == 0)
831 new->max_data_size = irttp_get_max_seg_size(new->tsap);
832#endif /* STREAM_COMPAT */
833
834 /* Clean up the original one to keep it in listen state */
835 irttp_listen(server->tsap);
836
837 /* Send a connection response on the new socket */
838 irttp_connect_response(new->tsap, new->max_sdu_size_rx, NULL);
839
840 /* Allow PPP to send its junk over the new socket... */
841 set_bit(0, &new->ttp_open);
842
843 /* Not connecting anymore, and clean up last possible remains
844 * of connection attempts on the socket */
845 clear_bit(0, &new->ttp_connect);
846 if(new->iriap)
847 {
848 iriap_close(new->iriap);
849 new->iriap = NULL;
850 }
851 if(new->discoveries != NULL)
852 {
853 kfree(new->discoveries);
854 new->discoveries = NULL;
855 }
856
857#ifdef CONNECT_INDIC_KICK
858 /* As currently we don't block packets in ppp_irnet_send() while passive,
859 * this is not really needed...
860 * Also, not doing it give IrDA a chance to finish the setup properly
861 * before being swamped with packets... */
862 ppp_output_wakeup(&new->chan);
863#endif /* CONNECT_INDIC_KICK */
864
865 /* Notify the control channel */
866 irnet_post_event(new, IRNET_CONNECT_FROM,
867 new->saddr, new->daddr, server->rname, 0);
868
869 DEXIT(IRDA_SERV_TRACE, "\n");
870 return 0;
871}
872
873/*------------------------------------------------------------------*/
874/*
875 * Function irda_disconnect_server (self)
876 *
877 * Cleanup the server socket when the incoming connection abort
878 *
879 */
880static inline void
881irnet_disconnect_server(irnet_socket * self,
882 struct sk_buff *skb)
883{
884 DENTER(IRDA_SERV_TRACE, "(self=0x%p)\n", self);
885
886 /* Put the received packet in the black hole */
887 kfree_skb(skb);
888
889#ifdef FAIL_SEND_DISCONNECT
890 /* Tell the other party we don't want to be connected */
891 /* Hum... Is it the right thing to do ? And do we need to send
892 * a connect response before ? It looks ok without this... */
893 irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
894#endif /* FAIL_SEND_DISCONNECT */
895
896 /* Notify the control channel (see irnet_find_socket()) */
897 irnet_post_event(NULL, IRNET_REQUEST_FROM,
898 self->saddr, self->daddr, self->rname, 0);
899
900 /* Clean up the server to keep it in listen state */
901 irttp_listen(self->tsap);
902
903 DEXIT(IRDA_SERV_TRACE, "\n");
904 return;
905}
906
907/*------------------------------------------------------------------*/
908/*
909 * Function irda_setup_server (self)
910 *
911 * Create a IrTTP server and set it up...
912 *
913 * Register the IrLAN hint bit, create a IrTTP instance for us,
914 * set all the IrTTP callbacks and create an IrIAS entry...
915 */
916static inline int
917irnet_setup_server(void)
918{
919 __u16 hints;
920
921 DENTER(IRDA_SERV_TRACE, "()\n");
922
923 /* Initialise the regular socket part of the server */
924 irda_irnet_create(&irnet_server.s);
925
926 /* Open a local TSAP (an IrTTP instance) for the server */
927 irnet_open_tsap(&irnet_server.s);
928
929 /* PPP part setup */
930 irnet_server.s.ppp_open = 0;
931 irnet_server.s.chan.private = NULL;
932 irnet_server.s.file = NULL;
933
934 /* Get the hint bit corresponding to IrLAN */
935 /* Note : we overload the IrLAN hint bit. As it is only a "hint", and as
936 * we provide roughly the same functionality as IrLAN, this is ok.
937 * In fact, the situation is similar as JetSend overloading the Obex hint
938 */
939 hints = irlmp_service_to_hint(S_LAN);
940
941#ifdef ADVERTISE_HINT
942 /* Register with IrLMP as a service (advertise our hint bit) */
943 irnet_server.skey = irlmp_register_service(hints);
944#endif /* ADVERTISE_HINT */
945
946 /* Register with LM-IAS (so that people can connect to us) */
947 irnet_server.ias_obj = irias_new_object(IRNET_SERVICE_NAME, jiffies);
948 irias_add_integer_attrib(irnet_server.ias_obj, IRNET_IAS_VALUE,
949 irnet_server.s.stsap_sel, IAS_KERNEL_ATTR);
950 irias_insert_object(irnet_server.ias_obj);
951
952#ifdef DISCOVERY_EVENTS
953 /* Tell IrLMP we want to be notified of newly discovered nodes */
954 irlmp_update_client(irnet_server.s.ckey, hints,
955 irnet_discovery_indication, irnet_expiry_indication,
956 (void *) &irnet_server.s);
957#endif
958
959 DEXIT(IRDA_SERV_TRACE, " - self=0x%p\n", &irnet_server.s);
960 return 0;
961}
962
963/*------------------------------------------------------------------*/
964/*
965 * Function irda_destroy_server (self)
966 *
967 * Destroy the IrTTP server...
968 *
969 * Reverse of the previous function...
970 */
971static inline void
972irnet_destroy_server(void)
973{
974 DENTER(IRDA_SERV_TRACE, "()\n");
975
976#ifdef ADVERTISE_HINT
977 /* Unregister with IrLMP */
978 irlmp_unregister_service(irnet_server.skey);
979#endif /* ADVERTISE_HINT */
980
981 /* Unregister with LM-IAS */
982 if(irnet_server.ias_obj)
983 irias_delete_object(irnet_server.ias_obj);
984
985 /* Cleanup the socket part */
986 irda_irnet_destroy(&irnet_server.s);
987
988 DEXIT(IRDA_SERV_TRACE, "\n");
989 return;
990}
991
992
993/************************ IRDA-TTP CALLBACKS ************************/
994/*
995 * When we create a IrTTP instance, we pass to it a set of callbacks
996 * that IrTTP will call in case of various events.
997 * We take care of those events here.
998 */
999
1000/*------------------------------------------------------------------*/
1001/*
1002 * Function irnet_data_indication (instance, sap, skb)
1003 *
1004 * Received some data from TinyTP. Just queue it on the receive queue
1005 *
1006 */
1007static int
1008irnet_data_indication(void * instance,
1009 void * sap,
1010 struct sk_buff *skb)
1011{
1012 irnet_socket * ap = (irnet_socket *) instance;
1013 unsigned char * p;
1014 int code = 0;
1015
1016 DENTER(IRDA_TCB_TRACE, "(self/ap=0x%p, skb=0x%p)\n",
1017 ap, skb);
1018 DASSERT(skb != NULL, 0, IRDA_CB_ERROR, "skb is NULL !!!\n");
1019
1020 /* Check is ppp is ready to receive our packet */
1021 if(!ap->ppp_open)
1022 {
1023 DERROR(IRDA_CB_ERROR, "PPP not ready, dropping packet...\n");
1024 /* When we return error, TTP will need to requeue the skb and
1025 * will stop the sender. IrTTP will stall until we send it a
1026 * flow control request... */
1027 return -ENOMEM;
1028 }
1029
1030 /* strip address/control field if present */
1031 p = skb->data;
1032 if((p[0] == PPP_ALLSTATIONS) && (p[1] == PPP_UI))
1033 {
1034 /* chop off address/control */
1035 if(skb->len < 3)
1036 goto err_exit;
1037 p = skb_pull(skb, 2);
1038 }
1039
1040 /* decompress protocol field if compressed */
1041 if(p[0] & 1)
1042 {
1043 /* protocol is compressed */
1044 skb_push(skb, 1)[0] = 0;
1045 }
1046 else
1047 if(skb->len < 2)
1048 goto err_exit;
1049
1050 /* pass to generic ppp layer */
1051 /* Note : how do I know if ppp can accept or not the packet ? This is
1052 * essential if I want to manage flow control smoothly... */
1053 ppp_input(&ap->chan, skb);
1054
1055 DEXIT(IRDA_TCB_TRACE, "\n");
1056 return 0;
1057
1058 err_exit:
1059 DERROR(IRDA_CB_ERROR, "Packet too small, dropping...\n");
1060 kfree_skb(skb);
1061 ppp_input_error(&ap->chan, code);
1062 return 0; /* Don't return an error code, only for flow control... */
1063}
1064
1065/*------------------------------------------------------------------*/
1066/*
1067 * Function irnet_disconnect_indication (instance, sap, reason, skb)
1068 *
1069 * Connection has been closed. Chech reason to find out why
1070 *
1071 * Note : there are many cases where we come here :
1072 * o attempted to connect, timeout
1073 * o connected, link is broken, LAP has timeout
1074 * o connected, other side close the link
1075 * o connection request on the server not handled
1076 */
1077static void
1078irnet_disconnect_indication(void * instance,
1079 void * sap,
1080 LM_REASON reason,
1081 struct sk_buff *skb)
1082{
1083 irnet_socket * self = (irnet_socket *) instance;
1084 int test_open;
1085 int test_connect;
1086
1087 DENTER(IRDA_TCB_TRACE, "(self=0x%p)\n", self);
1088 DASSERT(self != NULL, , IRDA_CB_ERROR, "Self is NULL !!!\n");
1089
1090 /* Don't care about it, but let's not leak it */
1091 if(skb)
1092 dev_kfree_skb(skb);
1093
1094 /* Prevent higher layer from accessing IrTTP */
1095 test_open = test_and_clear_bit(0, &self->ttp_open);
1096 /* Not connecting anymore...
1097 * (note : TSAP is open, so IAP callbacks are no longer pending...) */
1098 test_connect = test_and_clear_bit(0, &self->ttp_connect);
1099
1100 /* If both self->ttp_open and self->ttp_connect are NULL, it mean that we
1101 * have a race condition with irda_irnet_destroy() or
1102 * irnet_connect_indication(), so don't mess up tsap...
1103 */
1104 if(!(test_open || test_connect))
1105 {
1106 DERROR(IRDA_CB_ERROR, "Race condition detected...\n");
1107 return;
1108 }
1109
1110 /* If we were active, notify the control channel */
1111 if(test_open)
1112 irnet_post_event(self, IRNET_DISCONNECT_FROM,
1113 self->saddr, self->daddr, self->rname, 0);
1114 else
1115 /* If we were trying to connect, notify the control channel */
1116 if((self->tsap) && (self != &irnet_server.s))
1117 irnet_post_event(self, IRNET_NOANSWER_FROM,
1118 self->saddr, self->daddr, self->rname, 0);
1119
1120 /* Close our IrTTP connection, cleanup tsap */
1121 if((self->tsap) && (self != &irnet_server.s))
1122 {
1123 DEBUG(IRDA_CB_INFO, "Closing our TTP connection.\n");
1124 irttp_close_tsap(self->tsap);
1125 self->tsap = NULL;
1126 }
1127 /* Cleanup the socket in case we want to reconnect in ppp_output_wakeup() */
1128 self->stsap_sel = 0;
1129 self->daddr = DEV_ADDR_ANY;
1130 self->tx_flow = FLOW_START;
1131
1132 /* Deal with the ppp instance if it's still alive */
1133 if(self->ppp_open)
1134 {
1135 if(test_open)
1136 {
1137#ifdef MISSING_PPP_API
1138 /* ppp_unregister_channel() wants a user context, which we
1139 * are guaranteed to NOT have here. What are we supposed
1140 * to do here ? Jean II */
1141 /* If we were connected, cleanup & close the PPP channel,
1142 * which will kill pppd (hangup) and the rest */
1143 ppp_unregister_channel(&self->chan);
1144 self->ppp_open = 0;
1145#endif
1146 }
1147 else
1148 {
1149 /* If we were trying to connect, flush (drain) ppp_generic
1150 * Tx queue (most often we have blocked it), which will
1151 * trigger an other attempt to connect. If we are passive,
1152 * this will empty the Tx queue after last try. */
1153 ppp_output_wakeup(&self->chan);
1154 }
1155 }
1156
1157 DEXIT(IRDA_TCB_TRACE, "\n");
1158}
1159
1160/*------------------------------------------------------------------*/
1161/*
1162 * Function irnet_connect_confirm (instance, sap, qos, max_sdu_size, skb)
1163 *
1164 * Connections has been confirmed by the remote device
1165 *
1166 */
1167static void
1168irnet_connect_confirm(void * instance,
1169 void * sap,
1170 struct qos_info *qos,
1171 __u32 max_sdu_size,
1172 __u8 max_header_size,
1173 struct sk_buff *skb)
1174{
1175 irnet_socket * self = (irnet_socket *) instance;
1176
1177 DENTER(IRDA_TCB_TRACE, "(self=0x%p)\n", self);
1178
1179 /* Check if socket is closing down (via irda_irnet_destroy()) */
1180 if(! test_bit(0, &self->ttp_connect))
1181 {
1182 DERROR(IRDA_CB_ERROR, "Socket no longer connecting. Ouch !\n");
1183 return;
1184 }
1185
1186 /* How much header space do we need to reserve */
1187 self->max_header_size = max_header_size;
1188
1189 /* IrTTP max SDU size in transmit direction */
1190 self->max_sdu_size_tx = max_sdu_size;
1191 self->max_data_size = max_sdu_size;
1192#ifdef STREAM_COMPAT
1193 if(max_sdu_size == 0)
1194 self->max_data_size = irttp_get_max_seg_size(self->tsap);
1195#endif /* STREAM_COMPAT */
1196
1197 /* At this point, IrLMP has assigned our source address */
1198 self->saddr = irttp_get_saddr(self->tsap);
1199
1200 /* Allow higher layer to access IrTTP */
1201 set_bit(0, &self->ttp_open);
1202 clear_bit(0, &self->ttp_connect); /* Not racy, IrDA traffic is serial */
1203 /* Give a kick in the ass of ppp_generic so that he sends us some data */
1204 ppp_output_wakeup(&self->chan);
1205
1206 /* Check size of received packet */
1207 if(skb->len > 0)
1208 {
1209#ifdef PASS_CONNECT_PACKETS
1210 DEBUG(IRDA_CB_INFO, "Passing connect packet to PPP.\n");
1211 /* Try to pass it to PPP */
1212 irnet_data_indication(instance, sap, skb);
1213#else /* PASS_CONNECT_PACKETS */
1214 DERROR(IRDA_CB_ERROR, "Dropping non empty packet.\n");
1215 kfree_skb(skb); /* Note : will be optimised with other kfree... */
1216#endif /* PASS_CONNECT_PACKETS */
1217 }
1218 else
1219 kfree_skb(skb);
1220
1221 /* Notify the control channel */
1222 irnet_post_event(self, IRNET_CONNECT_TO,
1223 self->saddr, self->daddr, self->rname, 0);
1224
1225 DEXIT(IRDA_TCB_TRACE, "\n");
1226}
1227
1228/*------------------------------------------------------------------*/
1229/*
1230 * Function irnet_flow_indication (instance, sap, flow)
1231 *
1232 * Used by TinyTP to tell us if it can accept more data or not
1233 *
1234 */
1235static void
1236irnet_flow_indication(void * instance,
1237 void * sap,
1238 LOCAL_FLOW flow)
1239{
1240 irnet_socket * self = (irnet_socket *) instance;
1241 LOCAL_FLOW oldflow = self->tx_flow;
1242
1243 DENTER(IRDA_TCB_TRACE, "(self=0x%p, flow=%d)\n", self, flow);
1244
1245 /* Update our state */
1246 self->tx_flow = flow;
1247
1248 /* Check what IrTTP want us to do... */
1249 switch(flow)
1250 {
1251 case FLOW_START:
1252 DEBUG(IRDA_CB_INFO, "IrTTP wants us to start again\n");
1253 /* Check if we really need to wake up PPP */
1254 if(oldflow == FLOW_STOP)
1255 ppp_output_wakeup(&self->chan);
1256 else
1257 DEBUG(IRDA_CB_INFO, "But we were already transmitting !!!\n");
1258 break;
1259 case FLOW_STOP:
1260 DEBUG(IRDA_CB_INFO, "IrTTP wants us to slow down\n");
1261 break;
1262 default:
1263 DEBUG(IRDA_CB_INFO, "Unknown flow command!\n");
1264 break;
1265 }
1266
1267 DEXIT(IRDA_TCB_TRACE, "\n");
1268}
1269
1270/*------------------------------------------------------------------*/
1271/*
1272 * Function irnet_status_indication (instance, sap, reason, skb)
1273 *
1274 * Link (IrLAP) status report.
1275 *
1276 */
1277static void
1278irnet_status_indication(void * instance,
1279 LINK_STATUS link,
1280 LOCK_STATUS lock)
1281{
1282 irnet_socket * self = (irnet_socket *) instance;
1283
1284 DENTER(IRDA_TCB_TRACE, "(self=0x%p)\n", self);
1285 DASSERT(self != NULL, , IRDA_CB_ERROR, "Self is NULL !!!\n");
1286
1287 /* We can only get this event if we are connected */
1288 switch(link)
1289 {
1290 case STATUS_NO_ACTIVITY:
1291 irnet_post_event(self, IRNET_BLOCKED_LINK,
1292 self->saddr, self->daddr, self->rname, 0);
1293 break;
1294 default:
1295 DEBUG(IRDA_CB_INFO, "Unknown status...\n");
1296 }
1297
1298 DEXIT(IRDA_TCB_TRACE, "\n");
1299}
1300
1301/*------------------------------------------------------------------*/
1302/*
1303 * Function irnet_connect_indication(instance, sap, qos, max_sdu_size, userdata)
1304 *
1305 * Incoming connection
1306 *
1307 * In theory, this function is called only on the server socket.
1308 * Some other node is attempting to connect to the IrNET service, and has
1309 * sent a connection request on our server socket.
1310 * We just redirect the connection to the relevant IrNET socket.
1311 *
1312 * Note : we also make sure that between 2 irnet nodes, there can
1313 * exist only one irnet connection.
1314 */
1315static void
1316irnet_connect_indication(void * instance,
1317 void * sap,
1318 struct qos_info *qos,
1319 __u32 max_sdu_size,
1320 __u8 max_header_size,
1321 struct sk_buff *skb)
1322{
1323 irnet_socket * server = &irnet_server.s;
1324 irnet_socket * new = (irnet_socket *) NULL;
1325
1326 DENTER(IRDA_TCB_TRACE, "(server=0x%p)\n", server);
1327 DASSERT(instance == &irnet_server, , IRDA_CB_ERROR,
1328 "Invalid instance (0x%p) !!!\n", instance);
1329 DASSERT(sap == irnet_server.s.tsap, , IRDA_CB_ERROR, "Invalid sap !!!\n");
1330
1331 /* Try to find the most appropriate IrNET socket */
1332 new = irnet_find_socket(server);
1333
1334 /* After all this hard work, do we have an socket ? */
1335 if(new == (irnet_socket *) NULL)
1336 {
1337 DEXIT(IRDA_CB_INFO, ": No socket waiting for this connection.\n");
1338 irnet_disconnect_server(server, skb);
1339 return;
1340 }
1341
1342 /* Is the socket already busy ? */
1343 if(test_bit(0, &new->ttp_open))
1344 {
1345 DEXIT(IRDA_CB_INFO, ": Socket already connected.\n");
1346 irnet_disconnect_server(server, skb);
1347 return;
1348 }
1349
1350 /* The following code is a bit tricky, so need comments ;-)
1351 */
1352 /* If ttp_connect is set, the socket is trying to connect to the other
1353 * end and may have sent a IrTTP connection request and is waiting for
1354 * a connection response (that may never come).
1355 * Now, the pain is that the socket may have opened a tsap and is
1356 * waiting on it, while the other end is trying to connect to it on
1357 * another tsap.
1358 * Because IrNET can be peer to peer, we need to workaround this.
1359 * Furthermore, the way the irnetd script is implemented, the
1360 * target will create a second IrNET connection back to the
1361 * originator and expect the originator to bind this new connection
1362 * to the original PPPD instance.
1363 * And of course, if we don't use irnetd, we can have a race when
1364 * both side try to connect simultaneously, which could leave both
1365 * connections half closed (yuck).
1366 * Conclusions :
1367 * 1) The "originator" must accept the new connection and get rid
1368 * of the old one so that irnetd works
1369 * 2) One side must deny the new connection to avoid races,
1370 * but both side must agree on which side it is...
1371 * Most often, the originator is primary at the LAP layer.
1372 * Jean II
1373 */
1374 /* Now, let's look at the way I wrote the test...
1375 * We need to clear up the ttp_connect flag atomically to prevent
1376 * irnet_disconnect_indication() to mess up the tsap we are going to close.
1377 * We want to clear the ttp_connect flag only if we close the tsap,
1378 * otherwise we will never close it, so we need to check for primary
1379 * *before* doing the test on the flag.
1380 * And of course, ALLOW_SIMULT_CONNECT can disable this entirely...
1381 * Jean II
1382 */
1383
1384 /* Socket already connecting ? On primary ? */
1385 if(0
1386#ifdef ALLOW_SIMULT_CONNECT
1387 || ((irttp_is_primary(server->tsap) == 1) /* primary */
1388 && (test_and_clear_bit(0, &new->ttp_connect)))
1389#endif /* ALLOW_SIMULT_CONNECT */
1390 )
1391 {
1392 DERROR(IRDA_CB_ERROR, "Socket already connecting, but going to reuse it !\n");
1393
1394 /* Cleanup the old TSAP if necessary - IrIAP will be cleaned up later */
1395 if(new->tsap != NULL)
1396 {
1397 /* Close the old connection the new socket was attempting,
1398 * so that we can hook it up to the new connection.
1399 * It's now safe to do it... */
1400 irttp_close_tsap(new->tsap);
1401 new->tsap = NULL;
1402 }
1403 }
1404 else
1405 {
1406 /* Three options :
1407 * 1) socket was not connecting or connected : ttp_connect should be 0.
1408 * 2) we don't want to connect the socket because we are secondary or
1409 * ALLOW_SIMULT_CONNECT is undefined. ttp_connect should be 1.
1410 * 3) we are half way in irnet_disconnect_indication(), and it's a
1411 * nice race condition... Fortunately, we can detect that by checking
1412 * if tsap is still alive. On the other hand, we can't be in
1413 * irda_irnet_destroy() otherwise we would not have found this
1414 * socket in the hashbin.
1415 * Jean II */
1416 if((test_bit(0, &new->ttp_connect)) || (new->tsap != NULL))
1417 {
1418 /* Don't mess this socket, somebody else in in charge... */
1419 DERROR(IRDA_CB_ERROR, "Race condition detected, socket in use, abort connect...\n");
1420 irnet_disconnect_server(server, skb);
1421 return;
1422 }
1423 }
1424
1425 /* So : at this point, we have a socket, and it is idle. Good ! */
1426 irnet_connect_socket(server, new, qos, max_sdu_size, max_header_size);
1427
1428 /* Check size of received packet */
1429 if(skb->len > 0)
1430 {
1431#ifdef PASS_CONNECT_PACKETS
1432 DEBUG(IRDA_CB_INFO, "Passing connect packet to PPP.\n");
1433 /* Try to pass it to PPP */
1434 irnet_data_indication(new, new->tsap, skb);
1435#else /* PASS_CONNECT_PACKETS */
1436 DERROR(IRDA_CB_ERROR, "Dropping non empty packet.\n");
1437 kfree_skb(skb); /* Note : will be optimised with other kfree... */
1438#endif /* PASS_CONNECT_PACKETS */
1439 }
1440 else
1441 kfree_skb(skb);
1442
1443 DEXIT(IRDA_TCB_TRACE, "\n");
1444}
1445
1446
1447/********************** IRDA-IAS/LMP CALLBACKS **********************/
1448/*
1449 * These are the callbacks called by other layers of the IrDA stack,
1450 * mainly LMP for discovery and IAS for name queries.
1451 */
1452
1453/*------------------------------------------------------------------*/
1454/*
1455 * Function irnet_getvalue_confirm (result, obj_id, value, priv)
1456 *
1457 * Got answer from remote LM-IAS, just connect
1458 *
1459 * This is the reply to a IAS query we were doing to find the TSAP of
1460 * the device we want to connect to.
1461 * If we have found a valid TSAP, just initiate the TTP connection
1462 * on this TSAP.
1463 */
1464static void
1465irnet_getvalue_confirm(int result,
1466 __u16 obj_id,
1467 struct ias_value *value,
1468 void * priv)
1469{
1470 irnet_socket * self = (irnet_socket *) priv;
1471
1472 DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
1473 DASSERT(self != NULL, , IRDA_OCB_ERROR, "Self is NULL !!!\n");
1474
1475 /* Check if already connected (via irnet_connect_socket())
1476 * or socket is closing down (via irda_irnet_destroy()) */
1477 if(! test_bit(0, &self->ttp_connect))
1478 {
1479 DERROR(IRDA_OCB_ERROR, "Socket no longer connecting. Ouch !\n");
1480 return;
1481 }
1482
1483 /* We probably don't need to make any more queries */
1484 iriap_close(self->iriap);
1485 self->iriap = NULL;
1486
1487 /* Post process the IAS reply */
1488 self->dtsap_sel = irnet_ias_to_tsap(self, result, value);
1489
1490 /* If error, just go out */
1491 if(self->errno)
1492 {
1493 clear_bit(0, &self->ttp_connect);
1494 DERROR(IRDA_OCB_ERROR, "IAS connect failed ! (0x%X)\n", self->errno);
1495 return;
1496 }
1497
1498 DEBUG(IRDA_OCB_INFO, "daddr = %08x, lsap = %d, starting IrTTP connection\n",
1499 self->daddr, self->dtsap_sel);
1500
1501 /* Start up TTP - non blocking */
1502 irnet_connect_tsap(self);
1503
1504 DEXIT(IRDA_OCB_TRACE, "\n");
1505}
1506
1507/*------------------------------------------------------------------*/
1508/*
1509 * Function irnet_discovervalue_confirm (result, obj_id, value, priv)
1510 *
1511 * Handle the TSAP discovery procedure state machine.
1512 * Got answer from remote LM-IAS, try next device
1513 *
1514 * We are doing a TSAP discovery procedure, and we got an answer to
1515 * a IAS query we were doing to find the TSAP on one of the address
1516 * in the discovery log.
1517 *
1518 * If we have found a valid TSAP for the first time, save it. If it's
1519 * not the first time we found one, complain.
1520 *
1521 * If we have more addresses in the log, just initiate a new query.
1522 * Note that those query may fail (see irnet_discover_daddr_and_lsap_sel())
1523 *
1524 * Otherwise, wrap up the procedure (cleanup), check if we have found
1525 * any device and connect to it.
1526 */
1527static void
1528irnet_discovervalue_confirm(int result,
1529 __u16 obj_id,
1530 struct ias_value *value,
1531 void * priv)
1532{
1533 irnet_socket * self = (irnet_socket *) priv;
1534 __u8 dtsap_sel; /* TSAP we are looking for */
1535
1536 DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
1537 DASSERT(self != NULL, , IRDA_OCB_ERROR, "Self is NULL !!!\n");
1538
1539 /* Check if already connected (via irnet_connect_socket())
1540 * or socket is closing down (via irda_irnet_destroy()) */
1541 if(! test_bit(0, &self->ttp_connect))
1542 {
1543 DERROR(IRDA_OCB_ERROR, "Socket no longer connecting. Ouch !\n");
1544 return;
1545 }
1546
1547 /* Post process the IAS reply */
1548 dtsap_sel = irnet_ias_to_tsap(self, result, value);
1549
1550 /* Have we got something ? */
1551 if(self->errno == 0)
1552 {
1553 /* We found the requested service */
1554 if(self->daddr != DEV_ADDR_ANY)
1555 {
1556 DERROR(IRDA_OCB_ERROR, "More than one device in range supports IrNET...\n");
1557 }
1558 else
1559 {
1560 /* First time we found that one, save it ! */
1561 self->daddr = self->discoveries[self->disco_index].daddr;
1562 self->dtsap_sel = dtsap_sel;
1563 }
1564 }
1565
1566 /* If no failure */
1567 if((self->errno == -EADDRNOTAVAIL) || (self->errno == 0))
1568 {
1569 int ret;
1570
1571 /* Search the next node */
1572 ret = irnet_discover_next_daddr(self);
1573 if(!ret)
1574 {
1575 /* In this case, the above request was non-blocking.
1576 * We will return here after a while... */
1577 return;
1578 }
1579 /* In this case, we have processed the last discovery item */
1580 }
1581
1582 /* No more queries to be done (failure or last one) */
1583
1584 /* We probably don't need to make any more queries */
1585 iriap_close(self->iriap);
1586 self->iriap = NULL;
1587
1588 /* No more items : remove the log and signal termination */
1589 DEBUG(IRDA_OCB_INFO, "Cleaning up log (0x%p)\n",
1590 self->discoveries);
1591 if(self->discoveries != NULL)
1592 {
1593 /* Cleanup our copy of the discovery log */
1594 kfree(self->discoveries);
1595 self->discoveries = NULL;
1596 }
1597 self->disco_number = -1;
1598
1599 /* Check out what we found */
1600 if(self->daddr == DEV_ADDR_ANY)
1601 {
1602 self->daddr = DEV_ADDR_ANY;
1603 clear_bit(0, &self->ttp_connect);
1604 DEXIT(IRDA_OCB_TRACE, ": cannot discover IrNET in any device !!!\n");
1605 return;
1606 }
1607
1608 /* We have a valid address - just connect */
1609
1610 DEBUG(IRDA_OCB_INFO, "daddr = %08x, lsap = %d, starting IrTTP connection\n",
1611 self->daddr, self->dtsap_sel);
1612
1613 /* Start up TTP - non blocking */
1614 irnet_connect_tsap(self);
1615
1616 DEXIT(IRDA_OCB_TRACE, "\n");
1617}
1618
1619#ifdef DISCOVERY_EVENTS
1620/*------------------------------------------------------------------*/
1621/*
1622 * Function irnet_discovery_indication (discovery)
1623 *
1624 * Got a discovery indication from IrLMP, post an event
1625 *
1626 * Note : IrLMP take care of matching the hint mask for us, and also
1627 * check if it is a "new" node for us...
1628 *
1629 * As IrLMP filter on the IrLAN hint bit, we get both IrLAN and IrNET
1630 * nodes, so it's only at connection time that we will know if the
1631 * node support IrNET, IrLAN or both. The other solution is to check
1632 * in IAS the PNP ids and service name.
1633 * Note : even if a node support IrNET (or IrLAN), it's no guarantee
1634 * that we will be able to connect to it, the node might already be
1635 * busy...
1636 *
1637 * One last thing : in some case, this function will trigger duplicate
1638 * discovery events. On the other hand, we should catch all
1639 * discoveries properly (i.e. not miss one). Filtering duplicate here
1640 * is to messy, so we leave that to user space...
1641 */
1642static void
1643irnet_discovery_indication(discinfo_t * discovery,
1644 DISCOVERY_MODE mode,
1645 void * priv)
1646{
1647 irnet_socket * self = &irnet_server.s;
1648
1649 DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
1650 DASSERT(priv == &irnet_server, , IRDA_OCB_ERROR,
1651 "Invalid instance (0x%p) !!!\n", priv);
1652
1653 DEBUG(IRDA_OCB_INFO, "Discovered new IrNET/IrLAN node %s...\n",
1654 discovery->info);
1655
1656 /* Notify the control channel */
1657 irnet_post_event(NULL, IRNET_DISCOVER,
1658 discovery->saddr, discovery->daddr, discovery->info,
1659 u16ho(discovery->hints));
1660
1661 DEXIT(IRDA_OCB_TRACE, "\n");
1662}
1663
1664/*------------------------------------------------------------------*/
1665/*
1666 * Function irnet_expiry_indication (expiry)
1667 *
1668 * Got a expiry indication from IrLMP, post an event
1669 *
1670 * Note : IrLMP take care of matching the hint mask for us, we only
1671 * check if it is a "new" node...
1672 */
1673static void
1674irnet_expiry_indication(discinfo_t * expiry,
1675 DISCOVERY_MODE mode,
1676 void * priv)
1677{
1678 irnet_socket * self = &irnet_server.s;
1679
1680 DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
1681 DASSERT(priv == &irnet_server, , IRDA_OCB_ERROR,
1682 "Invalid instance (0x%p) !!!\n", priv);
1683
1684 DEBUG(IRDA_OCB_INFO, "IrNET/IrLAN node %s expired...\n",
1685 expiry->info);
1686
1687 /* Notify the control channel */
1688 irnet_post_event(NULL, IRNET_EXPIRE,
1689 expiry->saddr, expiry->daddr, expiry->info,
1690 u16ho(expiry->hints));
1691
1692 DEXIT(IRDA_OCB_TRACE, "\n");
1693}
1694#endif /* DISCOVERY_EVENTS */
1695
1696
1697/*********************** PROC ENTRY CALLBACKS ***********************/
1698/*
1699 * We create a instance in the /proc filesystem, and here we take care
1700 * of that...
1701 */
1702
1703#ifdef CONFIG_PROC_FS
1704/*------------------------------------------------------------------*/
1705/*
1706 * Function irnet_proc_read (buf, start, offset, len, unused)
1707 *
1708 * Give some info to the /proc file system
1709 */
1710static int
1711irnet_proc_read(char * buf,
1712 char ** start,
1713 off_t offset,
1714 int len)
1715{
1716 irnet_socket * self;
1717 char * state;
1718 int i = 0;
1719
1720 len = 0;
1721
1722 /* Get the IrNET server information... */
1723 len += sprintf(buf+len, "IrNET server - ");
1724 len += sprintf(buf+len, "IrDA state: %s, ",
1725 (irnet_server.running ? "running" : "dead"));
1726 len += sprintf(buf+len, "stsap_sel: %02x, ", irnet_server.s.stsap_sel);
1727 len += sprintf(buf+len, "dtsap_sel: %02x\n", irnet_server.s.dtsap_sel);
1728
1729 /* Do we need to continue ? */
1730 if(!irnet_server.running)
1731 return len;
1732
1733 /* Protect access to the instance list */
1734 spin_lock_bh(&irnet_server.spinlock);
1735
1736 /* Get the sockets one by one... */
1737 self = (irnet_socket *) hashbin_get_first(irnet_server.list);
1738 while(self != NULL)
1739 {
1740 /* Start printing info about the socket. */
1741 len += sprintf(buf+len, "\nIrNET socket %d - ", i++);
1742
1743 /* First, get the requested configuration */
1744 len += sprintf(buf+len, "Requested IrDA name: \"%s\", ", self->rname);
1745 len += sprintf(buf+len, "daddr: %08x, ", self->rdaddr);
1746 len += sprintf(buf+len, "saddr: %08x\n", self->rsaddr);
1747
1748 /* Second, get all the PPP info */
1749 len += sprintf(buf+len, " PPP state: %s",
1750 (self->ppp_open ? "registered" : "unregistered"));
1751 if(self->ppp_open)
1752 {
1753 len += sprintf(buf+len, ", unit: ppp%d",
1754 ppp_unit_number(&self->chan));
1755 len += sprintf(buf+len, ", channel: %d",
1756 ppp_channel_index(&self->chan));
1757 len += sprintf(buf+len, ", mru: %d",
1758 self->mru);
1759 /* Maybe add self->flags ? Later... */
1760 }
1761
1762 /* Then, get all the IrDA specific info... */
1763 if(self->ttp_open)
1764 state = "connected";
1765 else
1766 if(self->tsap != NULL)
1767 state = "connecting";
1768 else
1769 if(self->iriap != NULL)
1770 state = "searching";
1771 else
1772 if(self->ttp_connect)
1773 state = "weird";
1774 else
1775 state = "idle";
1776 len += sprintf(buf+len, "\n IrDA state: %s, ", state);
1777 len += sprintf(buf+len, "daddr: %08x, ", self->daddr);
1778 len += sprintf(buf+len, "stsap_sel: %02x, ", self->stsap_sel);
1779 len += sprintf(buf+len, "dtsap_sel: %02x\n", self->dtsap_sel);
1780
1781 /* Next socket, please... */
1782 self = (irnet_socket *) hashbin_get_next(irnet_server.list);
1783 }
1784
1785 /* Spin lock end */
1786 spin_unlock_bh(&irnet_server.spinlock);
1787
1788 return len;
1789}
1790#endif /* PROC_FS */
1791
1792
1793/********************** CONFIGURATION/CLEANUP **********************/
1794/*
1795 * Initialisation and teardown of the IrDA part, called at module
1796 * insertion and removal...
1797 */
1798
1799/*------------------------------------------------------------------*/
1800/*
1801 * Prepare the IrNET layer for operation...
1802 */
1803int __init
1804irda_irnet_init(void)
1805{
1806 int err = 0;
1807
1808 DENTER(MODULE_TRACE, "()\n");
1809
1810 /* Pure paranoia - should be redundant */
1811 memset(&irnet_server, 0, sizeof(struct irnet_root));
1812
1813 /* Setup start of irnet instance list */
1814 irnet_server.list = hashbin_new(HB_NOLOCK);
1815 DABORT(irnet_server.list == NULL, -ENOMEM,
1816 MODULE_ERROR, "Can't allocate hashbin!\n");
1817 /* Init spinlock for instance list */
1818 spin_lock_init(&irnet_server.spinlock);
1819
1820 /* Initialise control channel */
1821 init_waitqueue_head(&irnet_events.rwait);
1822 irnet_events.index = 0;
1823 /* Init spinlock for event logging */
1824 spin_lock_init(&irnet_events.spinlock);
1825
1826#ifdef CONFIG_PROC_FS
1827 /* Add a /proc file for irnet infos */
1828 create_proc_info_entry("irnet", 0, proc_irda, irnet_proc_read);
1829#endif /* CONFIG_PROC_FS */
1830
1831 /* Setup the IrNET server */
1832 err = irnet_setup_server();
1833
1834 if(!err)
1835 /* We are no longer functional... */
1836 irnet_server.running = 1;
1837
1838 DEXIT(MODULE_TRACE, "\n");
1839 return err;
1840}
1841
1842/*------------------------------------------------------------------*/
1843/*
1844 * Cleanup at exit...
1845 */
1846void __exit
1847irda_irnet_cleanup(void)
1848{
1849 DENTER(MODULE_TRACE, "()\n");
1850
1851 /* We are no longer there... */
1852 irnet_server.running = 0;
1853
1854#ifdef CONFIG_PROC_FS
1855 /* Remove our /proc file */
1856 remove_proc_entry("irnet", proc_irda);
1857#endif /* CONFIG_PROC_FS */
1858
1859 /* Remove our IrNET server from existence */
1860 irnet_destroy_server();
1861
1862 /* Remove all instances of IrNET socket still present */
1863 hashbin_delete(irnet_server.list, (FREE_FUNC) irda_irnet_destroy);
1864
1865 DEXIT(MODULE_TRACE, "\n");
1866}
diff --git a/net/irda/irnet/irnet_irda.h b/net/irda/irnet/irnet_irda.h
new file mode 100644
index 000000000000..f2fecd32d8f6
--- /dev/null
+++ b/net/irda/irnet/irnet_irda.h
@@ -0,0 +1,186 @@
1/*
2 * IrNET protocol module : Synchronous PPP over an IrDA socket.
3 *
4 * Jean II - HPL `00 - <jt@hpl.hp.com>
5 *
6 * This file contains all definitions and declarations necessary for the
7 * IRDA part of the IrNET module (dealing with IrTTP, IrIAS and co).
8 * This file is a private header, so other modules don't want to know
9 * what's in there...
10 */
11
12#ifndef IRNET_IRDA_H
13#define IRNET_IRDA_H
14
15/***************************** INCLUDES *****************************/
16/* Please add other headers in irnet.h */
17
18#include "irnet.h" /* Module global include */
19
20/************************ CONSTANTS & MACROS ************************/
21
22/*
23 * Name of the service (socket name) used by IrNET
24 */
25/* IAS object name (or part of it) */
26#define IRNET_SERVICE_NAME "IrNetv1"
27/* IAS attribute */
28#define IRNET_IAS_VALUE "IrDA:TinyTP:LsapSel"
29/* LMP notify name for client (only for /proc/net/irda/irlmp) */
30#define IRNET_NOTIFY_NAME "IrNET socket"
31/* LMP notify name for server (only for /proc/net/irda/irlmp) */
32#define IRNET_NOTIFY_NAME_SERV "IrNET server"
33
34/****************************** TYPES ******************************/
35
36/*
37 * This is the main structure where we store all the data pertaining to
38 * the IrNET server (listen for connection requests) and the root
39 * of the IrNET socket list
40 */
41typedef struct irnet_root
42{
43 irnet_socket s; /* To pretend we are a client... */
44
45 /* Generic stuff */
46 int magic; /* Paranoia */
47 int running; /* Are we operational ? */
48
49 /* Link list of all IrNET instances opened */
50 hashbin_t * list;
51 spinlock_t spinlock; /* Serialize access to the list */
52 /* Note : the way hashbin has been designed is absolutely not
53 * reentrant, beware... So, we blindly protect all with spinlock */
54
55 /* Handle for the hint bit advertised in IrLMP */
56 void * skey;
57
58 /* Server socket part */
59 struct ias_object * ias_obj; /* Our service name + lsap in IAS */
60
61} irnet_root;
62
63
64/**************************** PROTOTYPES ****************************/
65
66/* ----------------------- CONTROL CHANNEL ----------------------- */
67static void
68 irnet_post_event(irnet_socket *,
69 irnet_event,
70 __u32,
71 __u32,
72 char *,
73 __u16);
74/* ----------------------- IRDA SUBROUTINES ----------------------- */
75static inline int
76 irnet_open_tsap(irnet_socket *);
77static inline __u8
78 irnet_ias_to_tsap(irnet_socket *,
79 int,
80 struct ias_value *);
81static inline int
82 irnet_find_lsap_sel(irnet_socket *);
83static inline int
84 irnet_connect_tsap(irnet_socket *);
85static inline int
86 irnet_discover_next_daddr(irnet_socket *);
87static inline int
88 irnet_discover_daddr_and_lsap_sel(irnet_socket *);
89static inline int
90 irnet_dname_to_daddr(irnet_socket *);
91/* ------------------------ SERVER SOCKET ------------------------ */
92static inline int
93 irnet_daddr_to_dname(irnet_socket *);
94static inline irnet_socket *
95 irnet_find_socket(irnet_socket *);
96static inline int
97 irnet_connect_socket(irnet_socket *,
98 irnet_socket *,
99 struct qos_info *,
100 __u32,
101 __u8);
102static inline void
103 irnet_disconnect_server(irnet_socket *,
104 struct sk_buff *);
105static inline int
106 irnet_setup_server(void);
107static inline void
108 irnet_destroy_server(void);
109/* ---------------------- IRDA-TTP CALLBACKS ---------------------- */
110static int
111 irnet_data_indication(void *, /* instance */
112 void *, /* sap */
113 struct sk_buff *);
114static void
115 irnet_disconnect_indication(void *,
116 void *,
117 LM_REASON,
118 struct sk_buff *);
119static void
120 irnet_connect_confirm(void *,
121 void *,
122 struct qos_info *,
123 __u32,
124 __u8,
125 struct sk_buff *);
126static void
127 irnet_flow_indication(void *,
128 void *,
129 LOCAL_FLOW);
130static void
131 irnet_status_indication(void *,
132 LINK_STATUS,
133 LOCK_STATUS);
134static void
135 irnet_connect_indication(void *,
136 void *,
137 struct qos_info *,
138 __u32,
139 __u8,
140 struct sk_buff *);
141/* -------------------- IRDA-IAS/LMP CALLBACKS -------------------- */
142static void
143 irnet_getvalue_confirm(int,
144 __u16,
145 struct ias_value *,
146 void *);
147static void
148 irnet_discovervalue_confirm(int,
149 __u16,
150 struct ias_value *,
151 void *);
152#ifdef DISCOVERY_EVENTS
153static void
154 irnet_discovery_indication(discinfo_t *,
155 DISCOVERY_MODE,
156 void *);
157static void
158 irnet_expiry_indication(discinfo_t *,
159 DISCOVERY_MODE,
160 void *);
161#endif
162/* -------------------------- PROC ENTRY -------------------------- */
163#ifdef CONFIG_PROC_FS
164static int
165 irnet_proc_read(char *,
166 char **,
167 off_t,
168 int);
169#endif /* CONFIG_PROC_FS */
170
171/**************************** VARIABLES ****************************/
172
173/*
174 * The IrNET server. Listen to connection requests and co...
175 */
176static struct irnet_root irnet_server;
177
178/* Control channel stuff (note : extern) */
179struct irnet_ctrl_channel irnet_events;
180
181/* The /proc/net/irda directory, defined elsewhere... */
182#ifdef CONFIG_PROC_FS
183extern struct proc_dir_entry *proc_irda;
184#endif /* CONFIG_PROC_FS */
185
186#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 000000000000..f8f984bb9922
--- /dev/null
+++ b/net/irda/irnet/irnet_ppp.c
@@ -0,0 +1,1142 @@
1/*
2 * IrNET protocol module : Synchronous PPP over an IrDA socket.
3 *
4 * Jean II - HPL `00 - <jt@hpl.hp.com>
5 *
6 * This file implement the PPP interface and /dev/irnet character device.
7 * The PPP interface hook to the ppp_generic module, handle all our
8 * relationship to the PPP code in the kernel (and by extension to pppd),
9 * and exchange PPP frames with this module (send/receive).
10 * The /dev/irnet device is used primarily for 2 functions :
11 * 1) as a stub for pppd (the ppp daemon), so that we can appropriately
12 * generate PPP sessions (we pretend we are a tty).
13 * 2) as a control channel (write commands, read events)
14 */
15
16#include "irnet_ppp.h" /* Private header */
17/* Please put other headers in irnet.h - Thanks */
18
19/* Generic PPP callbacks (to call us) */
20static struct ppp_channel_ops irnet_ppp_ops = {
21 .start_xmit = ppp_irnet_send,
22 .ioctl = ppp_irnet_ioctl
23};
24
25/************************* CONTROL CHANNEL *************************/
26/*
27 * When a pppd instance is not active on /dev/irnet, it acts as a control
28 * channel.
29 * Writing allow to set up the IrDA destination of the IrNET channel,
30 * and any application may be read events happening in IrNET...
31 */
32
33/*------------------------------------------------------------------*/
34/*
35 * Write is used to send a command to configure a IrNET channel
36 * before it is open by pppd. The syntax is : "command argument"
37 * Currently there is only two defined commands :
38 * o name : set the requested IrDA nickname of the IrNET peer.
39 * o addr : set the requested IrDA address of the IrNET peer.
40 * Note : the code is crude, but effective...
41 */
42static inline ssize_t
43irnet_ctrl_write(irnet_socket * ap,
44 const char __user *buf,
45 size_t count)
46{
47 char command[IRNET_MAX_COMMAND];
48 char * start; /* Current command being processed */
49 char * next; /* Next command to process */
50 int length; /* Length of current command */
51
52 DENTER(CTRL_TRACE, "(ap=0x%p, count=%Zd)\n", ap, count);
53
54 /* Check for overflow... */
55 DABORT(count >= IRNET_MAX_COMMAND, -ENOMEM,
56 CTRL_ERROR, "Too much data !!!\n");
57
58 /* Get the data in the driver */
59 if(copy_from_user(command, buf, count))
60 {
61 DERROR(CTRL_ERROR, "Invalid user space pointer.\n");
62 return -EFAULT;
63 }
64
65 /* Safe terminate the string */
66 command[count] = '\0';
67 DEBUG(CTRL_INFO, "Command line received is ``%s'' (%Zd).\n",
68 command, count);
69
70 /* Check every commands in the command line */
71 next = command;
72 while(next != NULL)
73 {
74 /* Look at the next command */
75 start = next;
76
77 /* Scrap whitespaces before the command */
78 while(isspace(*start))
79 start++;
80
81 /* ',' is our command separator */
82 next = strchr(start, ',');
83 if(next)
84 {
85 *next = '\0'; /* Terminate command */
86 length = next - start; /* Length */
87 next++; /* Skip the '\0' */
88 }
89 else
90 length = strlen(start);
91
92 DEBUG(CTRL_INFO, "Found command ``%s'' (%d).\n", start, length);
93
94 /* Check if we recognised one of the known command
95 * We can't use "switch" with strings, so hack with "continue" */
96
97 /* First command : name -> Requested IrDA nickname */
98 if(!strncmp(start, "name", 4))
99 {
100 /* Copy the name only if is included and not "any" */
101 if((length > 5) && (strcmp(start + 5, "any")))
102 {
103 /* Strip out trailing whitespaces */
104 while(isspace(start[length - 1]))
105 length--;
106
107 /* Copy the name for later reuse */
108 memcpy(ap->rname, start + 5, length - 5);
109 ap->rname[length - 5] = '\0';
110 }
111 else
112 ap->rname[0] = '\0';
113 DEBUG(CTRL_INFO, "Got rname = ``%s''\n", ap->rname);
114
115 /* Restart the loop */
116 continue;
117 }
118
119 /* Second command : addr, daddr -> Requested IrDA destination address
120 * Also process : saddr -> Requested IrDA source address */
121 if((!strncmp(start, "addr", 4)) ||
122 (!strncmp(start, "daddr", 5)) ||
123 (!strncmp(start, "saddr", 5)))
124 {
125 __u32 addr = DEV_ADDR_ANY;
126
127 /* Copy the address only if is included and not "any" */
128 if((length > 5) && (strcmp(start + 5, "any")))
129 {
130 char * begp = start + 5;
131 char * endp;
132
133 /* Scrap whitespaces before the command */
134 while(isspace(*begp))
135 begp++;
136
137 /* Convert argument to a number (last arg is the base) */
138 addr = simple_strtoul(begp, &endp, 16);
139 /* Has it worked ? (endp should be start + length) */
140 DABORT(endp <= (start + 5), -EINVAL,
141 CTRL_ERROR, "Invalid address.\n");
142 }
143 /* Which type of address ? */
144 if(start[0] == 's')
145 {
146 /* Save it */
147 ap->rsaddr = addr;
148 DEBUG(CTRL_INFO, "Got rsaddr = %08x\n", ap->rsaddr);
149 }
150 else
151 {
152 /* Save it */
153 ap->rdaddr = addr;
154 DEBUG(CTRL_INFO, "Got rdaddr = %08x\n", ap->rdaddr);
155 }
156
157 /* Restart the loop */
158 continue;
159 }
160
161 /* Other possible command : connect N (number of retries) */
162
163 /* No command matched -> Failed... */
164 DABORT(1, -EINVAL, CTRL_ERROR, "Not a recognised IrNET command.\n");
165 }
166
167 /* Success : we have parsed all commands successfully */
168 return(count);
169}
170
171#ifdef INITIAL_DISCOVERY
172/*------------------------------------------------------------------*/
173/*
174 * Function irnet_get_discovery_log (self)
175 *
176 * Query the content on the discovery log if not done
177 *
178 * This function query the current content of the discovery log
179 * at the startup of the event channel and save it in the internal struct.
180 */
181static void
182irnet_get_discovery_log(irnet_socket * ap)
183{
184 __u16 mask = irlmp_service_to_hint(S_LAN);
185
186 /* Ask IrLMP for the current discovery log */
187 ap->discoveries = irlmp_get_discoveries(&ap->disco_number, mask,
188 DISCOVERY_DEFAULT_SLOTS);
189
190 /* Check if the we got some results */
191 if(ap->discoveries == NULL)
192 ap->disco_number = -1;
193
194 DEBUG(CTRL_INFO, "Got the log (0x%p), size is %d\n",
195 ap->discoveries, ap->disco_number);
196}
197
198/*------------------------------------------------------------------*/
199/*
200 * Function irnet_read_discovery_log (self, event)
201 *
202 * Read the content on the discovery log
203 *
204 * This function dump the current content of the discovery log
205 * at the startup of the event channel.
206 * Return 1 if wrote an event on the control channel...
207 *
208 * State of the ap->disco_XXX variables :
209 * Socket creation : discoveries = NULL ; disco_index = 0 ; disco_number = 0
210 * While reading : discoveries = ptr ; disco_index = X ; disco_number = Y
211 * After reading : discoveries = NULL ; disco_index = Y ; disco_number = -1
212 */
213static inline int
214irnet_read_discovery_log(irnet_socket * ap,
215 char * event)
216{
217 int done_event = 0;
218
219 DENTER(CTRL_TRACE, "(ap=0x%p, event=0x%p)\n",
220 ap, event);
221
222 /* Test if we have some work to do or we have already finished */
223 if(ap->disco_number == -1)
224 {
225 DEBUG(CTRL_INFO, "Already done\n");
226 return 0;
227 }
228
229 /* Test if it's the first time and therefore we need to get the log */
230 if(ap->discoveries == NULL)
231 irnet_get_discovery_log(ap);
232
233 /* Check if we have more item to dump */
234 if(ap->disco_index < ap->disco_number)
235 {
236 /* Write an event */
237 sprintf(event, "Found %08x (%s) behind %08x {hints %02X-%02X}\n",
238 ap->discoveries[ap->disco_index].daddr,
239 ap->discoveries[ap->disco_index].info,
240 ap->discoveries[ap->disco_index].saddr,
241 ap->discoveries[ap->disco_index].hints[0],
242 ap->discoveries[ap->disco_index].hints[1]);
243 DEBUG(CTRL_INFO, "Writing discovery %d : %s\n",
244 ap->disco_index, ap->discoveries[ap->disco_index].info);
245
246 /* We have an event */
247 done_event = 1;
248 /* Next discovery */
249 ap->disco_index++;
250 }
251
252 /* Check if we have done the last item */
253 if(ap->disco_index >= ap->disco_number)
254 {
255 /* No more items : remove the log and signal termination */
256 DEBUG(CTRL_INFO, "Cleaning up log (0x%p)\n",
257 ap->discoveries);
258 if(ap->discoveries != NULL)
259 {
260 /* Cleanup our copy of the discovery log */
261 kfree(ap->discoveries);
262 ap->discoveries = NULL;
263 }
264 ap->disco_number = -1;
265 }
266
267 return done_event;
268}
269#endif /* INITIAL_DISCOVERY */
270
271/*------------------------------------------------------------------*/
272/*
273 * Read is used to get IrNET events
274 */
275static inline ssize_t
276irnet_ctrl_read(irnet_socket * ap,
277 struct file * file,
278 char __user * buf,
279 size_t count)
280{
281 DECLARE_WAITQUEUE(wait, current);
282 char event[64]; /* Max event is 61 char */
283 ssize_t ret = 0;
284
285 DENTER(CTRL_TRACE, "(ap=0x%p, count=%Zd)\n", ap, count);
286
287 /* Check if we can write an event out in one go */
288 DABORT(count < sizeof(event), -EOVERFLOW, CTRL_ERROR, "Buffer to small.\n");
289
290#ifdef INITIAL_DISCOVERY
291 /* Check if we have read the log */
292 if(irnet_read_discovery_log(ap, event))
293 {
294 /* We have an event !!! Copy it to the user */
295 if(copy_to_user(buf, event, strlen(event)))
296 {
297 DERROR(CTRL_ERROR, "Invalid user space pointer.\n");
298 return -EFAULT;
299 }
300
301 DEXIT(CTRL_TRACE, "\n");
302 return(strlen(event));
303 }
304#endif /* INITIAL_DISCOVERY */
305
306 /* Put ourselves on the wait queue to be woken up */
307 add_wait_queue(&irnet_events.rwait, &wait);
308 current->state = TASK_INTERRUPTIBLE;
309 for(;;)
310 {
311 /* If there is unread events */
312 ret = 0;
313 if(ap->event_index != irnet_events.index)
314 break;
315 ret = -EAGAIN;
316 if(file->f_flags & O_NONBLOCK)
317 break;
318 ret = -ERESTARTSYS;
319 if(signal_pending(current))
320 break;
321 /* Yield and wait to be woken up */
322 schedule();
323 }
324 current->state = TASK_RUNNING;
325 remove_wait_queue(&irnet_events.rwait, &wait);
326
327 /* Did we got it ? */
328 if(ret != 0)
329 {
330 /* No, return the error code */
331 DEXIT(CTRL_TRACE, " - ret %Zd\n", ret);
332 return ret;
333 }
334
335 /* Which event is it ? */
336 switch(irnet_events.log[ap->event_index].event)
337 {
338 case IRNET_DISCOVER:
339 sprintf(event, "Discovered %08x (%s) behind %08x {hints %02X-%02X}\n",
340 irnet_events.log[ap->event_index].daddr,
341 irnet_events.log[ap->event_index].name,
342 irnet_events.log[ap->event_index].saddr,
343 irnet_events.log[ap->event_index].hints.byte[0],
344 irnet_events.log[ap->event_index].hints.byte[1]);
345 break;
346 case IRNET_EXPIRE:
347 sprintf(event, "Expired %08x (%s) behind %08x {hints %02X-%02X}\n",
348 irnet_events.log[ap->event_index].daddr,
349 irnet_events.log[ap->event_index].name,
350 irnet_events.log[ap->event_index].saddr,
351 irnet_events.log[ap->event_index].hints.byte[0],
352 irnet_events.log[ap->event_index].hints.byte[1]);
353 break;
354 case IRNET_CONNECT_TO:
355 sprintf(event, "Connected to %08x (%s) on ppp%d\n",
356 irnet_events.log[ap->event_index].daddr,
357 irnet_events.log[ap->event_index].name,
358 irnet_events.log[ap->event_index].unit);
359 break;
360 case IRNET_CONNECT_FROM:
361 sprintf(event, "Connection from %08x (%s) on ppp%d\n",
362 irnet_events.log[ap->event_index].daddr,
363 irnet_events.log[ap->event_index].name,
364 irnet_events.log[ap->event_index].unit);
365 break;
366 case IRNET_REQUEST_FROM:
367 sprintf(event, "Request from %08x (%s) behind %08x\n",
368 irnet_events.log[ap->event_index].daddr,
369 irnet_events.log[ap->event_index].name,
370 irnet_events.log[ap->event_index].saddr);
371 break;
372 case IRNET_NOANSWER_FROM:
373 sprintf(event, "No-answer from %08x (%s) on ppp%d\n",
374 irnet_events.log[ap->event_index].daddr,
375 irnet_events.log[ap->event_index].name,
376 irnet_events.log[ap->event_index].unit);
377 break;
378 case IRNET_BLOCKED_LINK:
379 sprintf(event, "Blocked link with %08x (%s) on ppp%d\n",
380 irnet_events.log[ap->event_index].daddr,
381 irnet_events.log[ap->event_index].name,
382 irnet_events.log[ap->event_index].unit);
383 break;
384 case IRNET_DISCONNECT_FROM:
385 sprintf(event, "Disconnection from %08x (%s) on ppp%d\n",
386 irnet_events.log[ap->event_index].daddr,
387 irnet_events.log[ap->event_index].name,
388 irnet_events.log[ap->event_index].unit);
389 break;
390 case IRNET_DISCONNECT_TO:
391 sprintf(event, "Disconnected to %08x (%s)\n",
392 irnet_events.log[ap->event_index].daddr,
393 irnet_events.log[ap->event_index].name);
394 break;
395 default:
396 sprintf(event, "Bug\n");
397 }
398 /* Increment our event index */
399 ap->event_index = (ap->event_index + 1) % IRNET_MAX_EVENTS;
400
401 DEBUG(CTRL_INFO, "Event is :%s", event);
402
403 /* Copy it to the user */
404 if(copy_to_user(buf, event, strlen(event)))
405 {
406 DERROR(CTRL_ERROR, "Invalid user space pointer.\n");
407 return -EFAULT;
408 }
409
410 DEXIT(CTRL_TRACE, "\n");
411 return(strlen(event));
412}
413
414/*------------------------------------------------------------------*/
415/*
416 * Poll : called when someone do a select on /dev/irnet.
417 * Just check if there are new events...
418 */
419static inline unsigned int
420irnet_ctrl_poll(irnet_socket * ap,
421 struct file * file,
422 poll_table * wait)
423{
424 unsigned int mask;
425
426 DENTER(CTRL_TRACE, "(ap=0x%p)\n", ap);
427
428 poll_wait(file, &irnet_events.rwait, wait);
429 mask = POLLOUT | POLLWRNORM;
430 /* If there is unread events */
431 if(ap->event_index != irnet_events.index)
432 mask |= POLLIN | POLLRDNORM;
433#ifdef INITIAL_DISCOVERY
434 if(ap->disco_number != -1)
435 {
436 /* Test if it's the first time and therefore we need to get the log */
437 if(ap->discoveries == NULL)
438 irnet_get_discovery_log(ap);
439 /* Recheck */
440 if(ap->disco_number != -1)
441 mask |= POLLIN | POLLRDNORM;
442 }
443#endif /* INITIAL_DISCOVERY */
444
445 DEXIT(CTRL_TRACE, " - mask=0x%X\n", mask);
446 return mask;
447}
448
449
450/*********************** FILESYSTEM CALLBACKS ***********************/
451/*
452 * Implement the usual open, read, write functions that will be called
453 * by the file system when some action is performed on /dev/irnet.
454 * Most of those actions will in fact be performed by "pppd" or
455 * the control channel, we just act as a redirector...
456 */
457
458/*------------------------------------------------------------------*/
459/*
460 * Open : when somebody open /dev/irnet
461 * We basically create a new instance of irnet and initialise it.
462 */
463static int
464dev_irnet_open(struct inode * inode,
465 struct file * file)
466{
467 struct irnet_socket * ap;
468 int err;
469
470 DENTER(FS_TRACE, "(file=0x%p)\n", file);
471
472#ifdef SECURE_DEVIRNET
473 /* This could (should?) be enforced by the permissions on /dev/irnet. */
474 if(!capable(CAP_NET_ADMIN))
475 return -EPERM;
476#endif /* SECURE_DEVIRNET */
477
478 /* Allocate a private structure for this IrNET instance */
479 ap = kmalloc(sizeof(*ap), GFP_KERNEL);
480 DABORT(ap == NULL, -ENOMEM, FS_ERROR, "Can't allocate struct irnet...\n");
481
482 /* initialize the irnet structure */
483 memset(ap, 0, sizeof(*ap));
484 ap->file = file;
485
486 /* PPP channel setup */
487 ap->ppp_open = 0;
488 ap->chan.private = ap;
489 ap->chan.ops = &irnet_ppp_ops;
490 ap->chan.mtu = (2048 - TTP_MAX_HEADER - 2 - PPP_HDRLEN);
491 ap->chan.hdrlen = 2 + TTP_MAX_HEADER; /* for A/C + Max IrDA hdr */
492 /* PPP parameters */
493 ap->mru = (2048 - TTP_MAX_HEADER - 2 - PPP_HDRLEN);
494 ap->xaccm[0] = ~0U;
495 ap->xaccm[3] = 0x60000000U;
496 ap->raccm = ~0U;
497
498 /* Setup the IrDA part... */
499 err = irda_irnet_create(ap);
500 if(err)
501 {
502 DERROR(FS_ERROR, "Can't setup IrDA link...\n");
503 kfree(ap);
504 return err;
505 }
506
507 /* For the control channel */
508 ap->event_index = irnet_events.index; /* Cancel all past events */
509
510 /* Put our stuff where we will be able to find it later */
511 file->private_data = ap;
512
513 DEXIT(FS_TRACE, " - ap=0x%p\n", ap);
514 return 0;
515}
516
517
518/*------------------------------------------------------------------*/
519/*
520 * Close : when somebody close /dev/irnet
521 * Destroy the instance of /dev/irnet
522 */
523static int
524dev_irnet_close(struct inode * inode,
525 struct file * file)
526{
527 irnet_socket * ap = (struct irnet_socket *) file->private_data;
528
529 DENTER(FS_TRACE, "(file=0x%p, ap=0x%p)\n",
530 file, ap);
531 DABORT(ap == NULL, 0, FS_ERROR, "ap is NULL !!!\n");
532
533 /* Detach ourselves */
534 file->private_data = NULL;
535
536 /* Close IrDA stuff */
537 irda_irnet_destroy(ap);
538
539 /* Disconnect from the generic PPP layer if not already done */
540 if(ap->ppp_open)
541 {
542 DERROR(FS_ERROR, "Channel still registered - deregistering !\n");
543 ap->ppp_open = 0;
544 ppp_unregister_channel(&ap->chan);
545 }
546
547 kfree(ap);
548
549 DEXIT(FS_TRACE, "\n");
550 return 0;
551}
552
553/*------------------------------------------------------------------*/
554/*
555 * Write does nothing.
556 * (we receive packet from ppp_generic through ppp_irnet_send())
557 */
558static ssize_t
559dev_irnet_write(struct file * file,
560 const char __user *buf,
561 size_t count,
562 loff_t * ppos)
563{
564 irnet_socket * ap = (struct irnet_socket *) file->private_data;
565
566 DPASS(FS_TRACE, "(file=0x%p, ap=0x%p, count=%Zd)\n",
567 file, ap, count);
568 DABORT(ap == NULL, -ENXIO, FS_ERROR, "ap is NULL !!!\n");
569
570 /* If we are connected to ppp_generic, let it handle the job */
571 if(ap->ppp_open)
572 return -EAGAIN;
573 else
574 return irnet_ctrl_write(ap, buf, count);
575}
576
577/*------------------------------------------------------------------*/
578/*
579 * Read doesn't do much either.
580 * (pppd poll us, but ultimately reads through /dev/ppp)
581 */
582static ssize_t
583dev_irnet_read(struct file * file,
584 char __user * buf,
585 size_t count,
586 loff_t * ppos)
587{
588 irnet_socket * ap = (struct irnet_socket *) file->private_data;
589
590 DPASS(FS_TRACE, "(file=0x%p, ap=0x%p, count=%Zd)\n",
591 file, ap, count);
592 DABORT(ap == NULL, -ENXIO, FS_ERROR, "ap is NULL !!!\n");
593
594 /* If we are connected to ppp_generic, let it handle the job */
595 if(ap->ppp_open)
596 return -EAGAIN;
597 else
598 return irnet_ctrl_read(ap, file, buf, count);
599}
600
601/*------------------------------------------------------------------*/
602/*
603 * Poll : called when someone do a select on /dev/irnet
604 */
605static unsigned int
606dev_irnet_poll(struct file * file,
607 poll_table * wait)
608{
609 irnet_socket * ap = (struct irnet_socket *) file->private_data;
610 unsigned int mask;
611
612 DENTER(FS_TRACE, "(file=0x%p, ap=0x%p)\n",
613 file, ap);
614
615 mask = POLLOUT | POLLWRNORM;
616 DABORT(ap == NULL, mask, FS_ERROR, "ap is NULL !!!\n");
617
618 /* If we are connected to ppp_generic, let it handle the job */
619 if(!ap->ppp_open)
620 mask |= irnet_ctrl_poll(ap, file, wait);
621
622 DEXIT(FS_TRACE, " - mask=0x%X\n", mask);
623 return(mask);
624}
625
626/*------------------------------------------------------------------*/
627/*
628 * IOCtl : Called when someone does some ioctls on /dev/irnet
629 * This is the way pppd configure us and control us while the PPP
630 * instance is active.
631 */
632static int
633dev_irnet_ioctl(struct inode * inode,
634 struct file * file,
635 unsigned int cmd,
636 unsigned long arg)
637{
638 irnet_socket * ap = (struct irnet_socket *) file->private_data;
639 int err;
640 int val;
641 void __user *argp = (void __user *)arg;
642
643 DENTER(FS_TRACE, "(file=0x%p, ap=0x%p, cmd=0x%X)\n",
644 file, ap, cmd);
645
646 /* Basic checks... */
647 DASSERT(ap != NULL, -ENXIO, PPP_ERROR, "ap is NULL...\n");
648#ifdef SECURE_DEVIRNET
649 if(!capable(CAP_NET_ADMIN))
650 return -EPERM;
651#endif /* SECURE_DEVIRNET */
652
653 err = -EFAULT;
654 switch(cmd)
655 {
656 /* Set discipline (should be N_SYNC_PPP or N_TTY) */
657 case TIOCSETD:
658 if(get_user(val, (int __user *)argp))
659 break;
660 if((val == N_SYNC_PPP) || (val == N_PPP))
661 {
662 DEBUG(FS_INFO, "Entering PPP discipline.\n");
663 /* PPP channel setup (ap->chan in configued in dev_irnet_open())*/
664 err = ppp_register_channel(&ap->chan);
665 if(err == 0)
666 {
667 /* Our ppp side is active */
668 ap->ppp_open = 1;
669
670 DEBUG(FS_INFO, "Trying to establish a connection.\n");
671 /* Setup the IrDA link now - may fail... */
672 irda_irnet_connect(ap);
673 }
674 else
675 DERROR(FS_ERROR, "Can't setup PPP channel...\n");
676 }
677 else
678 {
679 /* In theory, should be N_TTY */
680 DEBUG(FS_INFO, "Exiting PPP discipline.\n");
681 /* Disconnect from the generic PPP layer */
682 if(ap->ppp_open)
683 {
684 ap->ppp_open = 0;
685 ppp_unregister_channel(&ap->chan);
686 }
687 else
688 DERROR(FS_ERROR, "Channel not registered !\n");
689 err = 0;
690 }
691 break;
692
693 /* Query PPP channel and unit number */
694 case PPPIOCGCHAN:
695 if(!ap->ppp_open)
696 break;
697 if(put_user(ppp_channel_index(&ap->chan), (int __user *)argp))
698 break;
699 DEBUG(FS_INFO, "Query channel.\n");
700 err = 0;
701 break;
702 case PPPIOCGUNIT:
703 if(!ap->ppp_open)
704 break;
705 if(put_user(ppp_unit_number(&ap->chan), (int __user *)argp))
706 break;
707 DEBUG(FS_INFO, "Query unit number.\n");
708 err = 0;
709 break;
710
711 /* All these ioctls can be passed both directly and from ppp_generic,
712 * so we just deal with them in one place...
713 */
714 case PPPIOCGFLAGS:
715 case PPPIOCSFLAGS:
716 case PPPIOCGASYNCMAP:
717 case PPPIOCSASYNCMAP:
718 case PPPIOCGRASYNCMAP:
719 case PPPIOCSRASYNCMAP:
720 case PPPIOCGXASYNCMAP:
721 case PPPIOCSXASYNCMAP:
722 case PPPIOCGMRU:
723 case PPPIOCSMRU:
724 DEBUG(FS_INFO, "Standard PPP ioctl.\n");
725 if(!capable(CAP_NET_ADMIN))
726 err = -EPERM;
727 else
728 err = ppp_irnet_ioctl(&ap->chan, cmd, arg);
729 break;
730
731 /* TTY IOCTLs : Pretend that we are a tty, to keep pppd happy */
732 /* Get termios */
733 case TCGETS:
734 DEBUG(FS_INFO, "Get termios.\n");
735 if(kernel_termios_to_user_termios((struct termios __user *)argp, &ap->termios))
736 break;
737 err = 0;
738 break;
739 /* Set termios */
740 case TCSETSF:
741 DEBUG(FS_INFO, "Set termios.\n");
742 if(user_termios_to_kernel_termios(&ap->termios, (struct termios __user *)argp))
743 break;
744 err = 0;
745 break;
746
747 /* Set DTR/RTS */
748 case TIOCMBIS:
749 case TIOCMBIC:
750 /* Set exclusive/non-exclusive mode */
751 case TIOCEXCL:
752 case TIOCNXCL:
753 DEBUG(FS_INFO, "TTY compatibility.\n");
754 err = 0;
755 break;
756
757 case TCGETA:
758 DEBUG(FS_INFO, "TCGETA\n");
759 break;
760
761 case TCFLSH:
762 DEBUG(FS_INFO, "TCFLSH\n");
763 /* Note : this will flush buffers in PPP, so it *must* be done
764 * We should also worry that we don't accept junk here and that
765 * we get rid of our own buffers */
766#ifdef FLUSH_TO_PPP
767 ppp_output_wakeup(&ap->chan);
768#endif /* FLUSH_TO_PPP */
769 err = 0;
770 break;
771
772 case FIONREAD:
773 DEBUG(FS_INFO, "FIONREAD\n");
774 val = 0;
775 if(put_user(val, (int __user *)argp))
776 break;
777 err = 0;
778 break;
779
780 default:
781 DERROR(FS_ERROR, "Unsupported ioctl (0x%X)\n", cmd);
782 err = -ENOIOCTLCMD;
783 }
784
785 DEXIT(FS_TRACE, " - err = 0x%X\n", err);
786 return err;
787}
788
789/************************** PPP CALLBACKS **************************/
790/*
791 * This are the functions that the generic PPP driver in the kernel
792 * will call to communicate to us.
793 */
794
795/*------------------------------------------------------------------*/
796/*
797 * Prepare the ppp frame for transmission over the IrDA socket.
798 * We make sure that the header space is enough, and we change ppp header
799 * according to flags passed by pppd.
800 * This is not a callback, but just a helper function used in ppp_irnet_send()
801 */
802static inline struct sk_buff *
803irnet_prepare_skb(irnet_socket * ap,
804 struct sk_buff * skb)
805{
806 unsigned char * data;
807 int proto; /* PPP protocol */
808 int islcp; /* Protocol == LCP */
809 int needaddr; /* Need PPP address */
810
811 DENTER(PPP_TRACE, "(ap=0x%p, skb=0x%p)\n",
812 ap, skb);
813
814 /* Extract PPP protocol from the frame */
815 data = skb->data;
816 proto = (data[0] << 8) + data[1];
817
818 /* LCP packets with codes between 1 (configure-request)
819 * and 7 (code-reject) must be sent as though no options
820 * have been negotiated. */
821 islcp = (proto == PPP_LCP) && (1 <= data[2]) && (data[2] <= 7);
822
823 /* compress protocol field if option enabled */
824 if((data[0] == 0) && (ap->flags & SC_COMP_PROT) && (!islcp))
825 skb_pull(skb,1);
826
827 /* Check if we need address/control fields */
828 needaddr = 2*((ap->flags & SC_COMP_AC) == 0 || islcp);
829
830 /* Is the skb headroom large enough to contain all IrDA-headers? */
831 if((skb_headroom(skb) < (ap->max_header_size + needaddr)) ||
832 (skb_shared(skb)))
833 {
834 struct sk_buff * new_skb;
835
836 DEBUG(PPP_INFO, "Reallocating skb\n");
837
838 /* Create a new skb */
839 new_skb = skb_realloc_headroom(skb, ap->max_header_size + needaddr);
840
841 /* We have to free the original skb anyway */
842 dev_kfree_skb(skb);
843
844 /* Did the realloc succeed ? */
845 DABORT(new_skb == NULL, NULL, PPP_ERROR, "Could not realloc skb\n");
846
847 /* Use the new skb instead */
848 skb = new_skb;
849 }
850
851 /* prepend address/control fields if necessary */
852 if(needaddr)
853 {
854 skb_push(skb, 2);
855 skb->data[0] = PPP_ALLSTATIONS;
856 skb->data[1] = PPP_UI;
857 }
858
859 DEXIT(PPP_TRACE, "\n");
860
861 return skb;
862}
863
864/*------------------------------------------------------------------*/
865/*
866 * Send a packet to the peer over the IrTTP connection.
867 * Returns 1 iff the packet was accepted.
868 * Returns 0 iff packet was not consumed.
869 * If the packet was not accepted, we will call ppp_output_wakeup
870 * at some later time to reactivate flow control in ppp_generic.
871 */
872static int
873ppp_irnet_send(struct ppp_channel * chan,
874 struct sk_buff * skb)
875{
876 irnet_socket * self = (struct irnet_socket *) chan->private;
877 int ret;
878
879 DENTER(PPP_TRACE, "(channel=0x%p, ap/self=0x%p)\n",
880 chan, self);
881
882 /* Check if things are somewhat valid... */
883 DASSERT(self != NULL, 0, PPP_ERROR, "Self is NULL !!!\n");
884
885 /* Check if we are connected */
886 if(!(test_bit(0, &self->ttp_open)))
887 {
888#ifdef CONNECT_IN_SEND
889 /* Let's try to connect one more time... */
890 /* Note : we won't be connected after this call, but we should be
891 * ready for next packet... */
892 /* If we are already connecting, this will fail */
893 irda_irnet_connect(self);
894#endif /* CONNECT_IN_SEND */
895
896 DEBUG(PPP_INFO, "IrTTP not ready ! (%ld-%ld)\n",
897 self->ttp_open, self->ttp_connect);
898
899 /* Note : we can either drop the packet or block the packet.
900 *
901 * Blocking the packet allow us a better connection time,
902 * because by calling ppp_output_wakeup() we can have
903 * ppp_generic resending the LCP request immediately to us,
904 * rather than waiting for one of pppd periodic transmission of
905 * LCP request.
906 *
907 * On the other hand, if we block all packet, all those periodic
908 * transmissions of pppd accumulate in ppp_generic, creating a
909 * backlog of LCP request. When we eventually connect later on,
910 * we have to transmit all this backlog before we can connect
911 * proper (if we don't timeout before).
912 *
913 * The current strategy is as follow :
914 * While we are attempting to connect, we block packets to get
915 * a better connection time.
916 * If we fail to connect, we drain the queue and start dropping packets
917 */
918#ifdef BLOCK_WHEN_CONNECT
919 /* If we are attempting to connect */
920 if(test_bit(0, &self->ttp_connect))
921 {
922 /* Blocking packet, ppp_generic will retry later */
923 return 0;
924 }
925#endif /* BLOCK_WHEN_CONNECT */
926
927 /* Dropping packet, pppd will retry later */
928 dev_kfree_skb(skb);
929 return 1;
930 }
931
932 /* Check if the queue can accept any packet, otherwise block */
933 if(self->tx_flow != FLOW_START)
934 DRETURN(0, PPP_INFO, "IrTTP queue full (%d skbs)...\n",
935 skb_queue_len(&self->tsap->tx_queue));
936
937 /* Prepare ppp frame for transmission */
938 skb = irnet_prepare_skb(self, skb);
939 DABORT(skb == NULL, 1, PPP_ERROR, "Prepare skb for Tx failed.\n");
940
941 /* Send the packet to IrTTP */
942 ret = irttp_data_request(self->tsap, skb);
943 if(ret < 0)
944 {
945 /*
946 * > IrTTPs tx queue is full, so we just have to
947 * > drop the frame! You might think that we should
948 * > just return -1 and don't deallocate the frame,
949 * > but that is dangerous since it's possible that
950 * > we have replaced the original skb with a new
951 * > one with larger headroom, and that would really
952 * > confuse do_dev_queue_xmit() in dev.c! I have
953 * > tried :-) DB
954 * Correction : we verify the flow control above (self->tx_flow),
955 * so we come here only if IrTTP doesn't like the packet (empty,
956 * too large, IrTTP not connected). In those rare cases, it's ok
957 * to drop it, we don't want to see it here again...
958 * Jean II
959 */
960 DERROR(PPP_ERROR, "IrTTP doesn't like this packet !!! (0x%X)\n", ret);
961 /* irttp_data_request already free the packet */
962 }
963
964 DEXIT(PPP_TRACE, "\n");
965 return 1; /* Packet has been consumed */
966}
967
968/*------------------------------------------------------------------*/
969/*
970 * Take care of the ioctls that ppp_generic doesn't want to deal with...
971 * Note : we are also called from dev_irnet_ioctl().
972 */
973static int
974ppp_irnet_ioctl(struct ppp_channel * chan,
975 unsigned int cmd,
976 unsigned long arg)
977{
978 irnet_socket * ap = (struct irnet_socket *) chan->private;
979 int err;
980 int val;
981 u32 accm[8];
982 void __user *argp = (void __user *)arg;
983
984 DENTER(PPP_TRACE, "(channel=0x%p, ap=0x%p, cmd=0x%X)\n",
985 chan, ap, cmd);
986
987 /* Basic checks... */
988 DASSERT(ap != NULL, -ENXIO, PPP_ERROR, "ap is NULL...\n");
989
990 err = -EFAULT;
991 switch(cmd)
992 {
993 /* PPP flags */
994 case PPPIOCGFLAGS:
995 val = ap->flags | ap->rbits;
996 if(put_user(val, (int __user *) argp))
997 break;
998 err = 0;
999 break;
1000 case PPPIOCSFLAGS:
1001 if(get_user(val, (int __user *) argp))
1002 break;
1003 ap->flags = val & ~SC_RCV_BITS;
1004 ap->rbits = val & SC_RCV_BITS;
1005 err = 0;
1006 break;
1007
1008 /* Async map stuff - all dummy to please pppd */
1009 case PPPIOCGASYNCMAP:
1010 if(put_user(ap->xaccm[0], (u32 __user *) argp))
1011 break;
1012 err = 0;
1013 break;
1014 case PPPIOCSASYNCMAP:
1015 if(get_user(ap->xaccm[0], (u32 __user *) argp))
1016 break;
1017 err = 0;
1018 break;
1019 case PPPIOCGRASYNCMAP:
1020 if(put_user(ap->raccm, (u32 __user *) argp))
1021 break;
1022 err = 0;
1023 break;
1024 case PPPIOCSRASYNCMAP:
1025 if(get_user(ap->raccm, (u32 __user *) argp))
1026 break;
1027 err = 0;
1028 break;
1029 case PPPIOCGXASYNCMAP:
1030 if(copy_to_user(argp, ap->xaccm, sizeof(ap->xaccm)))
1031 break;
1032 err = 0;
1033 break;
1034 case PPPIOCSXASYNCMAP:
1035 if(copy_from_user(accm, argp, sizeof(accm)))
1036 break;
1037 accm[2] &= ~0x40000000U; /* can't escape 0x5e */
1038 accm[3] |= 0x60000000U; /* must escape 0x7d, 0x7e */
1039 memcpy(ap->xaccm, accm, sizeof(ap->xaccm));
1040 err = 0;
1041 break;
1042
1043 /* Max PPP frame size */
1044 case PPPIOCGMRU:
1045 if(put_user(ap->mru, (int __user *) argp))
1046 break;
1047 err = 0;
1048 break;
1049 case PPPIOCSMRU:
1050 if(get_user(val, (int __user *) argp))
1051 break;
1052 if(val < PPP_MRU)
1053 val = PPP_MRU;
1054 ap->mru = val;
1055 err = 0;
1056 break;
1057
1058 default:
1059 DEBUG(PPP_INFO, "Unsupported ioctl (0x%X)\n", cmd);
1060 err = -ENOIOCTLCMD;
1061 }
1062
1063 DEXIT(PPP_TRACE, " - err = 0x%X\n", err);
1064 return err;
1065}
1066
1067/************************** INITIALISATION **************************/
1068/*
1069 * Module initialisation and all that jazz...
1070 */
1071
1072/*------------------------------------------------------------------*/
1073/*
1074 * Hook our device callbacks in the filesystem, to connect our code
1075 * to /dev/irnet
1076 */
1077static inline int __init
1078ppp_irnet_init(void)
1079{
1080 int err = 0;
1081
1082 DENTER(MODULE_TRACE, "()\n");
1083
1084 /* Allocate ourselves as a minor in the misc range */
1085 err = misc_register(&irnet_misc_device);
1086
1087 DEXIT(MODULE_TRACE, "\n");
1088 return err;
1089}
1090
1091/*------------------------------------------------------------------*/
1092/*
1093 * Cleanup at exit...
1094 */
1095static inline void __exit
1096ppp_irnet_cleanup(void)
1097{
1098 DENTER(MODULE_TRACE, "()\n");
1099
1100 /* De-allocate /dev/irnet minor in misc range */
1101 misc_deregister(&irnet_misc_device);
1102
1103 DEXIT(MODULE_TRACE, "\n");
1104}
1105
1106/*------------------------------------------------------------------*/
1107/*
1108 * Module main entry point
1109 */
1110int __init
1111irnet_init(void)
1112{
1113 int err;
1114
1115 /* Initialise both parts... */
1116 err = irda_irnet_init();
1117 if(!err)
1118 err = ppp_irnet_init();
1119 return err;
1120}
1121
1122/*------------------------------------------------------------------*/
1123/*
1124 * Module exit
1125 */
1126static void __exit
1127irnet_cleanup(void)
1128{
1129 irda_irnet_cleanup();
1130 ppp_irnet_cleanup();
1131}
1132
1133/*------------------------------------------------------------------*/
1134/*
1135 * Module magic
1136 */
1137module_init(irnet_init);
1138module_exit(irnet_cleanup);
1139MODULE_AUTHOR("Jean Tourrilhes <jt@hpl.hp.com>");
1140MODULE_DESCRIPTION("IrNET : Synchronous PPP over IrDA");
1141MODULE_LICENSE("GPL");
1142MODULE_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 000000000000..d2beb7df8f7f
--- /dev/null
+++ b/net/irda/irnet/irnet_ppp.h
@@ -0,0 +1,119 @@
1/*
2 * IrNET protocol module : Synchronous PPP over an IrDA socket.
3 *
4 * Jean II - HPL `00 - <jt@hpl.hp.com>
5 *
6 * This file contains all definitions and declarations necessary for the
7 * PPP part of the IrNET module.
8 * This file is a private header, so other modules don't want to know
9 * what's in there...
10 */
11
12#ifndef IRNET_PPP_H
13#define IRNET_PPP_H
14
15/***************************** INCLUDES *****************************/
16
17#include "irnet.h" /* Module global include */
18
19/************************ CONSTANTS & MACROS ************************/
20
21/* /dev/irnet file constants */
22#define IRNET_MAJOR 10 /* Misc range */
23#define IRNET_MINOR 187 /* Official allocation */
24
25/* IrNET control channel stuff */
26#define IRNET_MAX_COMMAND 256 /* Max length of a command line */
27
28/* PPP hardcore stuff */
29
30/* Bits in rbits (PPP flags in irnet struct) */
31#define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
32
33/* Bit numbers in busy */
34#define XMIT_BUSY 0
35#define RECV_BUSY 1
36#define XMIT_WAKEUP 2
37#define XMIT_FULL 3
38
39/* Queue management */
40#define PPPSYNC_MAX_RQLEN 32 /* arbitrary */
41
42/****************************** TYPES ******************************/
43
44
45/**************************** PROTOTYPES ****************************/
46
47/* ----------------------- CONTROL CHANNEL ----------------------- */
48static inline ssize_t
49 irnet_ctrl_write(irnet_socket *,
50 const char *,
51 size_t);
52static inline ssize_t
53 irnet_ctrl_read(irnet_socket *,
54 struct file *,
55 char *,
56 size_t);
57static inline unsigned int
58 irnet_ctrl_poll(irnet_socket *,
59 struct file *,
60 poll_table *);
61/* ----------------------- CHARACTER DEVICE ----------------------- */
62static int
63 dev_irnet_open(struct inode *, /* fs callback : open */
64 struct file *),
65 dev_irnet_close(struct inode *,
66 struct file *);
67static ssize_t
68 dev_irnet_write(struct file *,
69 const char __user *,
70 size_t,
71 loff_t *),
72 dev_irnet_read(struct file *,
73 char __user *,
74 size_t,
75 loff_t *);
76static unsigned int
77 dev_irnet_poll(struct file *,
78 poll_table *);
79static int
80 dev_irnet_ioctl(struct inode *,
81 struct file *,
82 unsigned int,
83 unsigned long);
84/* ------------------------ PPP INTERFACE ------------------------ */
85static inline struct sk_buff *
86 irnet_prepare_skb(irnet_socket *,
87 struct sk_buff *);
88static int
89 ppp_irnet_send(struct ppp_channel *,
90 struct sk_buff *);
91static int
92 ppp_irnet_ioctl(struct ppp_channel *,
93 unsigned int,
94 unsigned long);
95
96/**************************** VARIABLES ****************************/
97
98/* Filesystem callbacks (to call us) */
99static struct file_operations irnet_device_fops =
100{
101 .owner = THIS_MODULE,
102 .read = dev_irnet_read,
103 .write = dev_irnet_write,
104 .poll = dev_irnet_poll,
105 .ioctl = dev_irnet_ioctl,
106 .open = dev_irnet_open,
107 .release = dev_irnet_close
108 /* Also : llseek, readdir, mmap, flush, fsync, fasync, lock, readv, writev */
109};
110
111/* Structure so that the misc major (drivers/char/misc.c) take care of us... */
112static struct miscdevice irnet_misc_device =
113{
114 IRNET_MINOR,
115 "irnet",
116 &irnet_device_fops
117};
118
119#endif /* IRNET_PPP_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-07 03:24:18 -0400