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[linux-2.6/next.git] / net / tipc / link.c
bloba3616b99529b72ef1085fe95c99fd972e95e6b93
1 /*
2 * net/tipc/link.c: TIPC link code
3 *
4 * Copyright (c) 1996-2007, Ericsson AB
5 * Copyright (c) 2004-2007, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37 #include "core.h"
38 #include "dbg.h"
39 #include "link.h"
40 #include "net.h"
41 #include "node.h"
42 #include "port.h"
43 #include "addr.h"
44 #include "node_subscr.h"
45 #include "name_distr.h"
46 #include "bearer.h"
47 #include "name_table.h"
48 #include "discover.h"
49 #include "config.h"
50 #include "bcast.h"
51
52
53 /*
54 * Out-of-range value for link session numbers
55 */
56
57 #define INVALID_SESSION 0x10000
58
59 /*
60 * Limit for deferred reception queue:
61 */
62
63 #define DEF_QUEUE_LIMIT 256u
64
65 /*
66 * Link state events:
67 */
68
69 #define STARTING_EVT 856384768 /* link processing trigger */
70 #define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
71 #define TIMEOUT_EVT 560817u /* link timer expired */
72
73 /*
74 * The following two 'message types' is really just implementation
75 * data conveniently stored in the message header.
76 * They must not be considered part of the protocol
77 */
78 #define OPEN_MSG 0
79 #define CLOSED_MSG 1
80
81 /*
82 * State value stored in 'exp_msg_count'
83 */
84
85 #define START_CHANGEOVER 100000u
86
87 /**
88 * struct link_name - deconstructed link name
89 * @addr_local: network address of node at this end
90 * @if_local: name of interface at this end
91 * @addr_peer: network address of node at far end
92 * @if_peer: name of interface at far end
93 */
94
95 struct link_name {
96 u32 addr_local;
97 char if_local[TIPC_MAX_IF_NAME];
98 u32 addr_peer;
99 char if_peer[TIPC_MAX_IF_NAME];
100 };
101
102 #if 0
103
104 /* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
105
106 /**
107 * struct link_event - link up/down event notification
108 */
109
110 struct link_event {
111 u32 addr;
112 int up;
113 void (*fcn)(u32, char *, int);
114 char name[TIPC_MAX_LINK_NAME];
115 };
116
117 #endif
118
119 static void link_handle_out_of_seq_msg(struct link *l_ptr,
120 struct sk_buff *buf);
121 static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf);
122 static int link_recv_changeover_msg(struct link **l_ptr, struct sk_buff **buf);
123 static void link_set_supervision_props(struct link *l_ptr, u32 tolerance);
124 static int link_send_sections_long(struct port *sender,
125 struct iovec const *msg_sect,
126 u32 num_sect, u32 destnode);
127 static void link_check_defragm_bufs(struct link *l_ptr);
128 static void link_state_event(struct link *l_ptr, u32 event);
129 static void link_reset_statistics(struct link *l_ptr);
130 static void link_print(struct link *l_ptr, struct print_buf *buf,
131 const char *str);
132
133 /*
134 * Debugging code used by link routines only
135 *
136 * When debugging link problems on a system that has multiple links,
137 * the standard TIPC debugging routines may not be useful since they
138 * allow the output from multiple links to be intermixed. For this reason
139 * routines of the form "dbg_link_XXX()" have been created that will capture
140 * debug info into a link's personal print buffer, which can then be dumped
141 * into the TIPC system log (TIPC_LOG) upon request.
142 *
143 * To enable per-link debugging, use LINK_LOG_BUF_SIZE to specify the size
144 * of the print buffer used by each link. If LINK_LOG_BUF_SIZE is set to 0,
145 * the dbg_link_XXX() routines simply send their output to the standard
146 * debug print buffer (DBG_OUTPUT), if it has been defined; this can be useful
147 * when there is only a single link in the system being debugged.
148 *
149 * Notes:
150 * - When enabled, LINK_LOG_BUF_SIZE should be set to at least TIPC_PB_MIN_SIZE
151 * - "l_ptr" must be valid when using dbg_link_XXX() macros
152 */
153
154 #define LINK_LOG_BUF_SIZE 0
155
156 #define dbg_link(fmt, arg...) \
157 do { \
158 if (LINK_LOG_BUF_SIZE) \
159 tipc_printf(&l_ptr->print_buf, fmt, ## arg); \
160 } while (0)
161 #define dbg_link_msg(msg, txt) \
162 do { \
163 if (LINK_LOG_BUF_SIZE) \
164 tipc_msg_dbg(&l_ptr->print_buf, msg, txt); \
165 } while (0)
166 #define dbg_link_state(txt) \
167 do { \
168 if (LINK_LOG_BUF_SIZE) \
169 link_print(l_ptr, &l_ptr->print_buf, txt); \
170 } while (0)
171 #define dbg_link_dump() do { \
172 if (LINK_LOG_BUF_SIZE) { \
173 tipc_printf(LOG, "\n\nDumping link <%s>:\n", l_ptr->name); \
174 tipc_printbuf_move(LOG, &l_ptr->print_buf); \
175 } \
176 } while (0)
177
178 static void dbg_print_link(struct link *l_ptr, const char *str)
179 {
180 if (DBG_OUTPUT != TIPC_NULL)
181 link_print(l_ptr, DBG_OUTPUT, str);
182 }
183
184 static void dbg_print_buf_chain(struct sk_buff *root_buf)
185 {
186 if (DBG_OUTPUT != TIPC_NULL) {
187 struct sk_buff *buf = root_buf;
188
189 while (buf) {
190 msg_dbg(buf_msg(buf), "In chain: ");
191 buf = buf->next;
192 }
193 }
194 }
195
196 /*
197 * Simple link routines
198 */
199
200 static unsigned int align(unsigned int i)
201 {
202 return (i + 3) & ~3u;
203 }
204
205 static void link_init_max_pkt(struct link *l_ptr)
206 {
207 u32 max_pkt;
208
209 max_pkt = (l_ptr->b_ptr->publ.mtu & ~3);
210 if (max_pkt > MAX_MSG_SIZE)
211 max_pkt = MAX_MSG_SIZE;
212
213 l_ptr->max_pkt_target = max_pkt;
214 if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
215 l_ptr->max_pkt = l_ptr->max_pkt_target;
216 else
217 l_ptr->max_pkt = MAX_PKT_DEFAULT;
218
219 l_ptr->max_pkt_probes = 0;
220 }
221
222 static u32 link_next_sent(struct link *l_ptr)
223 {
224 if (l_ptr->next_out)
225 return msg_seqno(buf_msg(l_ptr->next_out));
226 return mod(l_ptr->next_out_no);
227 }
228
229 static u32 link_last_sent(struct link *l_ptr)
230 {
231 return mod(link_next_sent(l_ptr) - 1);
232 }
233
234 /*
235 * Simple non-static link routines (i.e. referenced outside this file)
236 */
237
238 int tipc_link_is_up(struct link *l_ptr)
239 {
240 if (!l_ptr)
241 return 0;
242 return (link_working_working(l_ptr) || link_working_unknown(l_ptr));
243 }
244
245 int tipc_link_is_active(struct link *l_ptr)
246 {
247 return ((l_ptr->owner->active_links[0] == l_ptr) ||
248 (l_ptr->owner->active_links[1] == l_ptr));
249 }
250
251 /**
252 * link_name_validate - validate & (optionally) deconstruct link name
253 * @name - ptr to link name string
254 * @name_parts - ptr to area for link name components (or NULL if not needed)
255 *
256 * Returns 1 if link name is valid, otherwise 0.
257 */
258
259 static int link_name_validate(const char *name, struct link_name *name_parts)
260 {
261 char name_copy[TIPC_MAX_LINK_NAME];
262 char *addr_local;
263 char *if_local;
264 char *addr_peer;
265 char *if_peer;
266 char dummy;
267 u32 z_local, c_local, n_local;
268 u32 z_peer, c_peer, n_peer;
269 u32 if_local_len;
270 u32 if_peer_len;
271
272 /* copy link name & ensure length is OK */
273
274 name_copy[TIPC_MAX_LINK_NAME - 1] = 0;
275 /* need above in case non-Posix strncpy() doesn't pad with nulls */
276 strncpy(name_copy, name, TIPC_MAX_LINK_NAME);
277 if (name_copy[TIPC_MAX_LINK_NAME - 1] != 0)
278 return 0;
279
280 /* ensure all component parts of link name are present */
281
282 addr_local = name_copy;
283 if ((if_local = strchr(addr_local, ':')) == NULL)
284 return 0;
285 *(if_local++) = 0;
286 if ((addr_peer = strchr(if_local, '-')) == NULL)
287 return 0;
288 *(addr_peer++) = 0;
289 if_local_len = addr_peer - if_local;
290 if ((if_peer = strchr(addr_peer, ':')) == NULL)
291 return 0;
292 *(if_peer++) = 0;
293 if_peer_len = strlen(if_peer) + 1;
294
295 /* validate component parts of link name */
296
297 if ((sscanf(addr_local, "%u.%u.%u%c",
298 &z_local, &c_local, &n_local, &dummy) != 3) ||
299 (sscanf(addr_peer, "%u.%u.%u%c",
300 &z_peer, &c_peer, &n_peer, &dummy) != 3) ||
301 (z_local > 255) || (c_local > 4095) || (n_local > 4095) ||
302 (z_peer > 255) || (c_peer > 4095) || (n_peer > 4095) ||
303 (if_local_len <= 1) || (if_local_len > TIPC_MAX_IF_NAME) ||
304 (if_peer_len <= 1) || (if_peer_len > TIPC_MAX_IF_NAME) ||
305 (strspn(if_local, tipc_alphabet) != (if_local_len - 1)) ||
306 (strspn(if_peer, tipc_alphabet) != (if_peer_len - 1)))
307 return 0;
308
309 /* return link name components, if necessary */
310
311 if (name_parts) {
312 name_parts->addr_local = tipc_addr(z_local, c_local, n_local);
313 strcpy(name_parts->if_local, if_local);
314 name_parts->addr_peer = tipc_addr(z_peer, c_peer, n_peer);
315 strcpy(name_parts->if_peer, if_peer);
316 }
317 return 1;
318 }
319
320 /**
321 * link_timeout - handle expiration of link timer
322 * @l_ptr: pointer to link
323 *
324 * This routine must not grab "tipc_net_lock" to avoid a potential deadlock conflict
325 * with tipc_link_delete(). (There is no risk that the node will be deleted by
326 * another thread because tipc_link_delete() always cancels the link timer before
327 * tipc_node_delete() is called.)
328 */
329
330 static void link_timeout(struct link *l_ptr)
331 {
332 tipc_node_lock(l_ptr->owner);
333
334 /* update counters used in statistical profiling of send traffic */
335
336 l_ptr->stats.accu_queue_sz += l_ptr->out_queue_size;
337 l_ptr->stats.queue_sz_counts++;
338
339 if (l_ptr->out_queue_size > l_ptr->stats.max_queue_sz)
340 l_ptr->stats.max_queue_sz = l_ptr->out_queue_size;
341
342 if (l_ptr->first_out) {
343 struct tipc_msg *msg = buf_msg(l_ptr->first_out);
344 u32 length = msg_size(msg);
345
346 if ((msg_user(msg) == MSG_FRAGMENTER) &&
347 (msg_type(msg) == FIRST_FRAGMENT)) {
348 length = msg_size(msg_get_wrapped(msg));
349 }
350 if (length) {
351 l_ptr->stats.msg_lengths_total += length;
352 l_ptr->stats.msg_length_counts++;
353 if (length <= 64)
354 l_ptr->stats.msg_length_profile[0]++;
355 else if (length <= 256)
356 l_ptr->stats.msg_length_profile[1]++;
357 else if (length <= 1024)
358 l_ptr->stats.msg_length_profile[2]++;
359 else if (length <= 4096)
360 l_ptr->stats.msg_length_profile[3]++;
361 else if (length <= 16384)
362 l_ptr->stats.msg_length_profile[4]++;
363 else if (length <= 32768)
364 l_ptr->stats.msg_length_profile[5]++;
365 else
366 l_ptr->stats.msg_length_profile[6]++;
367 }
368 }
369
370 /* do all other link processing performed on a periodic basis */
371
372 link_check_defragm_bufs(l_ptr);
373
374 link_state_event(l_ptr, TIMEOUT_EVT);
375
376 if (l_ptr->next_out)
377 tipc_link_push_queue(l_ptr);
378
379 tipc_node_unlock(l_ptr->owner);
380 }
381
382 static void link_set_timer(struct link *l_ptr, u32 time)
383 {
384 k_start_timer(&l_ptr->timer, time);
385 }
386
387 /**
388 * tipc_link_create - create a new link
389 * @b_ptr: pointer to associated bearer
390 * @peer: network address of node at other end of link
391 * @media_addr: media address to use when sending messages over link
392 *
393 * Returns pointer to link.
394 */
395
396 struct link *tipc_link_create(struct bearer *b_ptr, const u32 peer,
397 const struct tipc_media_addr *media_addr)
398 {
399 struct link *l_ptr;
400 struct tipc_msg *msg;
401 char *if_name;
402
403 l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
404 if (!l_ptr) {
405 warn("Link creation failed, no memory\n");
406 return NULL;
407 }
408
409 if (LINK_LOG_BUF_SIZE) {
410 char *pb = kmalloc(LINK_LOG_BUF_SIZE, GFP_ATOMIC);
411
412 if (!pb) {
413 kfree(l_ptr);
414 warn("Link creation failed, no memory for print buffer\n");
415 return NULL;
416 }
417 tipc_printbuf_init(&l_ptr->print_buf, pb, LINK_LOG_BUF_SIZE);
418 }
419
420 l_ptr->addr = peer;
421 if_name = strchr(b_ptr->publ.name, ':') + 1;
422 sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:",
423 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
424 tipc_node(tipc_own_addr),
425 if_name,
426 tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
427 /* note: peer i/f is appended to link name by reset/activate */
428 memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
429 l_ptr->checkpoint = 1;
430 l_ptr->b_ptr = b_ptr;
431 link_set_supervision_props(l_ptr, b_ptr->media->tolerance);
432 l_ptr->state = RESET_UNKNOWN;
433
434 l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
435 msg = l_ptr->pmsg;
436 tipc_msg_init(msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, l_ptr->addr);
437 msg_set_size(msg, sizeof(l_ptr->proto_msg));
438 msg_set_session(msg, (tipc_random & 0xffff));
439 msg_set_bearer_id(msg, b_ptr->identity);
440 strcpy((char *)msg_data(msg), if_name);
441
442 l_ptr->priority = b_ptr->priority;
443 tipc_link_set_queue_limits(l_ptr, b_ptr->media->window);
444
445 link_init_max_pkt(l_ptr);
446
447 l_ptr->next_out_no = 1;
448 INIT_LIST_HEAD(&l_ptr->waiting_ports);
449
450 link_reset_statistics(l_ptr);
451
452 l_ptr->owner = tipc_node_attach_link(l_ptr);
453 if (!l_ptr->owner) {
454 if (LINK_LOG_BUF_SIZE)
455 kfree(l_ptr->print_buf.buf);
456 kfree(l_ptr);
457 return NULL;
458 }
459
460 k_init_timer(&l_ptr->timer, (Handler)link_timeout, (unsigned long)l_ptr);
461 list_add_tail(&l_ptr->link_list, &b_ptr->links);
462 tipc_k_signal((Handler)tipc_link_start, (unsigned long)l_ptr);
463
464 dbg("tipc_link_create(): tolerance = %u,cont intv = %u, abort_limit = %u\n",
465 l_ptr->tolerance, l_ptr->continuity_interval, l_ptr->abort_limit);
466
467 return l_ptr;
468 }
469
470 /**
471 * tipc_link_delete - delete a link
472 * @l_ptr: pointer to link
473 *
474 * Note: 'tipc_net_lock' is write_locked, bearer is locked.
475 * This routine must not grab the node lock until after link timer cancellation
476 * to avoid a potential deadlock situation.
477 */
478
479 void tipc_link_delete(struct link *l_ptr)
480 {
481 if (!l_ptr) {
482 err("Attempt to delete non-existent link\n");
483 return;
484 }
485
486 dbg("tipc_link_delete()\n");
487
488 k_cancel_timer(&l_ptr->timer);
489
490 tipc_node_lock(l_ptr->owner);
491 tipc_link_reset(l_ptr);
492 tipc_node_detach_link(l_ptr->owner, l_ptr);
493 tipc_link_stop(l_ptr);
494 list_del_init(&l_ptr->link_list);
495 if (LINK_LOG_BUF_SIZE)
496 kfree(l_ptr->print_buf.buf);
497 tipc_node_unlock(l_ptr->owner);
498 k_term_timer(&l_ptr->timer);
499 kfree(l_ptr);
500 }
501
502 void tipc_link_start(struct link *l_ptr)
503 {
504 dbg("tipc_link_start %x\n", l_ptr);
505 link_state_event(l_ptr, STARTING_EVT);
506 }
507
508 /**
509 * link_schedule_port - schedule port for deferred sending
510 * @l_ptr: pointer to link
511 * @origport: reference to sending port
512 * @sz: amount of data to be sent
513 *
514 * Schedules port for renewed sending of messages after link congestion
515 * has abated.
516 */
517
518 static int link_schedule_port(struct link *l_ptr, u32 origport, u32 sz)
519 {
520 struct port *p_ptr;
521
522 spin_lock_bh(&tipc_port_list_lock);
523 p_ptr = tipc_port_lock(origport);
524 if (p_ptr) {
525 if (!p_ptr->wakeup)
526 goto exit;
527 if (!list_empty(&p_ptr->wait_list))
528 goto exit;
529 p_ptr->publ.congested = 1;
530 p_ptr->waiting_pkts = 1 + ((sz - 1) / l_ptr->max_pkt);
531 list_add_tail(&p_ptr->wait_list, &l_ptr->waiting_ports);
532 l_ptr->stats.link_congs++;
533 exit:
534 tipc_port_unlock(p_ptr);
535 }
536 spin_unlock_bh(&tipc_port_list_lock);
537 return -ELINKCONG;
538 }
539
540 void tipc_link_wakeup_ports(struct link *l_ptr, int all)
541 {
542 struct port *p_ptr;
543 struct port *temp_p_ptr;
544 int win = l_ptr->queue_limit[0] - l_ptr->out_queue_size;
545
546 if (all)
547 win = 100000;
548 if (win <= 0)
549 return;
550 if (!spin_trylock_bh(&tipc_port_list_lock))
551 return;
552 if (link_congested(l_ptr))
553 goto exit;
554 list_for_each_entry_safe(p_ptr, temp_p_ptr, &l_ptr->waiting_ports,
555 wait_list) {
556 if (win <= 0)
557 break;
558 list_del_init(&p_ptr->wait_list);
559 spin_lock_bh(p_ptr->publ.lock);
560 p_ptr->publ.congested = 0;
561 p_ptr->wakeup(&p_ptr->publ);
562 win -= p_ptr->waiting_pkts;
563 spin_unlock_bh(p_ptr->publ.lock);
564 }
565
566 exit:
567 spin_unlock_bh(&tipc_port_list_lock);
568 }
569
570 /**
571 * link_release_outqueue - purge link's outbound message queue
572 * @l_ptr: pointer to link
573 */
574
575 static void link_release_outqueue(struct link *l_ptr)
576 {
577 struct sk_buff *buf = l_ptr->first_out;
578 struct sk_buff *next;
579
580 while (buf) {
581 next = buf->next;
582 buf_discard(buf);
583 buf = next;
584 }
585 l_ptr->first_out = NULL;
586 l_ptr->out_queue_size = 0;
587 }
588
589 /**
590 * tipc_link_reset_fragments - purge link's inbound message fragments queue
591 * @l_ptr: pointer to link
592 */
593
594 void tipc_link_reset_fragments(struct link *l_ptr)
595 {
596 struct sk_buff *buf = l_ptr->defragm_buf;
597 struct sk_buff *next;
598
599 while (buf) {
600 next = buf->next;
601 buf_discard(buf);
602 buf = next;
603 }
604 l_ptr->defragm_buf = NULL;
605 }
606
607 /**
608 * tipc_link_stop - purge all inbound and outbound messages associated with link
609 * @l_ptr: pointer to link
610 */
611
612 void tipc_link_stop(struct link *l_ptr)
613 {
614 struct sk_buff *buf;
615 struct sk_buff *next;
616
617 buf = l_ptr->oldest_deferred_in;
618 while (buf) {
619 next = buf->next;
620 buf_discard(buf);
621 buf = next;
622 }
623
624 buf = l_ptr->first_out;
625 while (buf) {
626 next = buf->next;
627 buf_discard(buf);
628 buf = next;
629 }
630
631 tipc_link_reset_fragments(l_ptr);
632
633 buf_discard(l_ptr->proto_msg_queue);
634 l_ptr->proto_msg_queue = NULL;
635 }
636
637 #if 0
638
639 /* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
640
641 static void link_recv_event(struct link_event *ev)
642 {
643 ev->fcn(ev->addr, ev->name, ev->up);
644 kfree(ev);
645 }
646
647 static void link_send_event(void (*fcn)(u32 a, char *n, int up),
648 struct link *l_ptr, int up)
649 {
650 struct link_event *ev;
651
652 ev = kmalloc(sizeof(*ev), GFP_ATOMIC);
653 if (!ev) {
654 warn("Link event allocation failure\n");
655 return;
656 }
657 ev->addr = l_ptr->addr;
658 ev->up = up;
659 ev->fcn = fcn;
660 memcpy(ev->name, l_ptr->name, TIPC_MAX_LINK_NAME);
661 tipc_k_signal((Handler)link_recv_event, (unsigned long)ev);
662 }
663
664 #else
665
666 #define link_send_event(fcn, l_ptr, up) do { } while (0)
667
668 #endif
669
670 void tipc_link_reset(struct link *l_ptr)
671 {
672 struct sk_buff *buf;
673 u32 prev_state = l_ptr->state;
674 u32 checkpoint = l_ptr->next_in_no;
675 int was_active_link = tipc_link_is_active(l_ptr);
676
677 msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff));
678
679 /* Link is down, accept any session */
680 l_ptr->peer_session = INVALID_SESSION;
681
682 /* Prepare for max packet size negotiation */
683 link_init_max_pkt(l_ptr);
684
685 l_ptr->state = RESET_UNKNOWN;
686 dbg_link_state("Resetting Link\n");
687
688 if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
689 return;
690
691 tipc_node_link_down(l_ptr->owner, l_ptr);
692 tipc_bearer_remove_dest(l_ptr->b_ptr, l_ptr->addr);
693 #if 0
694 tipc_printf(TIPC_CONS, "\nReset link <%s>\n", l_ptr->name);
695 dbg_link_dump();
696 #endif
697 if (was_active_link && tipc_node_has_active_links(l_ptr->owner) &&
698 l_ptr->owner->permit_changeover) {
699 l_ptr->reset_checkpoint = checkpoint;
700 l_ptr->exp_msg_count = START_CHANGEOVER;
701 }
702
703 /* Clean up all queues: */
704
705 link_release_outqueue(l_ptr);
706 buf_discard(l_ptr->proto_msg_queue);
707 l_ptr->proto_msg_queue = NULL;
708 buf = l_ptr->oldest_deferred_in;
709 while (buf) {
710 struct sk_buff *next = buf->next;
711 buf_discard(buf);
712 buf = next;
713 }
714 if (!list_empty(&l_ptr->waiting_ports))
715 tipc_link_wakeup_ports(l_ptr, 1);
716
717 l_ptr->retransm_queue_head = 0;
718 l_ptr->retransm_queue_size = 0;
719 l_ptr->last_out = NULL;
720 l_ptr->first_out = NULL;
721 l_ptr->next_out = NULL;
722 l_ptr->unacked_window = 0;
723 l_ptr->checkpoint = 1;
724 l_ptr->next_out_no = 1;
725 l_ptr->deferred_inqueue_sz = 0;
726 l_ptr->oldest_deferred_in = NULL;
727 l_ptr->newest_deferred_in = NULL;
728 l_ptr->fsm_msg_cnt = 0;
729 l_ptr->stale_count = 0;
730 link_reset_statistics(l_ptr);
731
732 link_send_event(tipc_cfg_link_event, l_ptr, 0);
733 if (!in_own_cluster(l_ptr->addr))
734 link_send_event(tipc_disc_link_event, l_ptr, 0);
735 }
736
737
738 static void link_activate(struct link *l_ptr)
739 {
740 l_ptr->next_in_no = l_ptr->stats.recv_info = 1;
741 tipc_node_link_up(l_ptr->owner, l_ptr);
742 tipc_bearer_add_dest(l_ptr->b_ptr, l_ptr->addr);
743 link_send_event(tipc_cfg_link_event, l_ptr, 1);
744 if (!in_own_cluster(l_ptr->addr))
745 link_send_event(tipc_disc_link_event, l_ptr, 1);
746 }
747
748 /**
749 * link_state_event - link finite state machine
750 * @l_ptr: pointer to link
751 * @event: state machine event to process
752 */
753
754 static void link_state_event(struct link *l_ptr, unsigned event)
755 {
756 struct link *other;
757 u32 cont_intv = l_ptr->continuity_interval;
758
759 if (!l_ptr->started && (event != STARTING_EVT))
760 return; /* Not yet. */
761
762 if (link_blocked(l_ptr)) {
763 if (event == TIMEOUT_EVT) {
764 link_set_timer(l_ptr, cont_intv);
765 }
766 return; /* Changeover going on */
767 }
768 dbg_link("STATE_EV: <%s> ", l_ptr->name);
769
770 switch (l_ptr->state) {
771 case WORKING_WORKING:
772 dbg_link("WW/");
773 switch (event) {
774 case TRAFFIC_MSG_EVT:
775 dbg_link("TRF-");
776 /* fall through */
777 case ACTIVATE_MSG:
778 dbg_link("ACT\n");
779 break;
780 case TIMEOUT_EVT:
781 dbg_link("TIM ");
782 if (l_ptr->next_in_no != l_ptr->checkpoint) {
783 l_ptr->checkpoint = l_ptr->next_in_no;
784 if (tipc_bclink_acks_missing(l_ptr->owner)) {
785 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
786 0, 0, 0, 0, 0);
787 l_ptr->fsm_msg_cnt++;
788 } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
789 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
790 1, 0, 0, 0, 0);
791 l_ptr->fsm_msg_cnt++;
792 }
793 link_set_timer(l_ptr, cont_intv);
794 break;
795 }
796 dbg_link(" -> WU\n");
797 l_ptr->state = WORKING_UNKNOWN;
798 l_ptr->fsm_msg_cnt = 0;
799 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
800 l_ptr->fsm_msg_cnt++;
801 link_set_timer(l_ptr, cont_intv / 4);
802 break;
803 case RESET_MSG:
804 dbg_link("RES -> RR\n");
805 info("Resetting link <%s>, requested by peer\n",
806 l_ptr->name);
807 tipc_link_reset(l_ptr);
808 l_ptr->state = RESET_RESET;
809 l_ptr->fsm_msg_cnt = 0;
810 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
811 l_ptr->fsm_msg_cnt++;
812 link_set_timer(l_ptr, cont_intv);
813 break;
814 default:
815 err("Unknown link event %u in WW state\n", event);
816 }
817 break;
818 case WORKING_UNKNOWN:
819 dbg_link("WU/");
820 switch (event) {
821 case TRAFFIC_MSG_EVT:
822 dbg_link("TRF-");
823 case ACTIVATE_MSG:
824 dbg_link("ACT -> WW\n");
825 l_ptr->state = WORKING_WORKING;
826 l_ptr->fsm_msg_cnt = 0;
827 link_set_timer(l_ptr, cont_intv);
828 break;
829 case RESET_MSG:
830 dbg_link("RES -> RR\n");
831 info("Resetting link <%s>, requested by peer "
832 "while probing\n", l_ptr->name);
833 tipc_link_reset(l_ptr);
834 l_ptr->state = RESET_RESET;
835 l_ptr->fsm_msg_cnt = 0;
836 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
837 l_ptr->fsm_msg_cnt++;
838 link_set_timer(l_ptr, cont_intv);
839 break;
840 case TIMEOUT_EVT:
841 dbg_link("TIM ");
842 if (l_ptr->next_in_no != l_ptr->checkpoint) {
843 dbg_link("-> WW\n");
844 l_ptr->state = WORKING_WORKING;
845 l_ptr->fsm_msg_cnt = 0;
846 l_ptr->checkpoint = l_ptr->next_in_no;
847 if (tipc_bclink_acks_missing(l_ptr->owner)) {
848 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
849 0, 0, 0, 0, 0);
850 l_ptr->fsm_msg_cnt++;
851 }
852 link_set_timer(l_ptr, cont_intv);
853 } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
854 dbg_link("Probing %u/%u,timer = %u ms)\n",
855 l_ptr->fsm_msg_cnt, l_ptr->abort_limit,
856 cont_intv / 4);
857 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
858 1, 0, 0, 0, 0);
859 l_ptr->fsm_msg_cnt++;
860 link_set_timer(l_ptr, cont_intv / 4);
861 } else { /* Link has failed */
862 dbg_link("-> RU (%u probes unanswered)\n",
863 l_ptr->fsm_msg_cnt);
864 warn("Resetting link <%s>, peer not responding\n",
865 l_ptr->name);
866 tipc_link_reset(l_ptr);
867 l_ptr->state = RESET_UNKNOWN;
868 l_ptr->fsm_msg_cnt = 0;
869 tipc_link_send_proto_msg(l_ptr, RESET_MSG,
870 0, 0, 0, 0, 0);
871 l_ptr->fsm_msg_cnt++;
872 link_set_timer(l_ptr, cont_intv);
873 }
874 break;
875 default:
876 err("Unknown link event %u in WU state\n", event);
877 }
878 break;
879 case RESET_UNKNOWN:
880 dbg_link("RU/");
881 switch (event) {
882 case TRAFFIC_MSG_EVT:
883 dbg_link("TRF-\n");
884 break;
885 case ACTIVATE_MSG:
886 other = l_ptr->owner->active_links[0];
887 if (other && link_working_unknown(other)) {
888 dbg_link("ACT\n");
889 break;
890 }
891 dbg_link("ACT -> WW\n");
892 l_ptr->state = WORKING_WORKING;
893 l_ptr->fsm_msg_cnt = 0;
894 link_activate(l_ptr);
895 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
896 l_ptr->fsm_msg_cnt++;
897 link_set_timer(l_ptr, cont_intv);
898 break;
899 case RESET_MSG:
900 dbg_link("RES\n");
901 dbg_link(" -> RR\n");
902 l_ptr->state = RESET_RESET;
903 l_ptr->fsm_msg_cnt = 0;
904 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 1, 0, 0, 0, 0);
905 l_ptr->fsm_msg_cnt++;
906 link_set_timer(l_ptr, cont_intv);
907 break;
908 case STARTING_EVT:
909 dbg_link("START-");
910 l_ptr->started = 1;
911 /* fall through */
912 case TIMEOUT_EVT:
913 dbg_link("TIM\n");
914 tipc_link_send_proto_msg(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
915 l_ptr->fsm_msg_cnt++;
916 link_set_timer(l_ptr, cont_intv);
917 break;
918 default:
919 err("Unknown link event %u in RU state\n", event);
920 }
921 break;
922 case RESET_RESET:
923 dbg_link("RR/ ");
924 switch (event) {
925 case TRAFFIC_MSG_EVT:
926 dbg_link("TRF-");
927 /* fall through */
928 case ACTIVATE_MSG:
929 other = l_ptr->owner->active_links[0];
930 if (other && link_working_unknown(other)) {
931 dbg_link("ACT\n");
932 break;
933 }
934 dbg_link("ACT -> WW\n");
935 l_ptr->state = WORKING_WORKING;
936 l_ptr->fsm_msg_cnt = 0;
937 link_activate(l_ptr);
938 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
939 l_ptr->fsm_msg_cnt++;
940 link_set_timer(l_ptr, cont_intv);
941 break;
942 case RESET_MSG:
943 dbg_link("RES\n");
944 break;
945 case TIMEOUT_EVT:
946 dbg_link("TIM\n");
947 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
948 l_ptr->fsm_msg_cnt++;
949 link_set_timer(l_ptr, cont_intv);
950 dbg_link("fsm_msg_cnt %u\n", l_ptr->fsm_msg_cnt);
951 break;
952 default:
953 err("Unknown link event %u in RR state\n", event);
954 }
955 break;
956 default:
957 err("Unknown link state %u/%u\n", l_ptr->state, event);
958 }
959 }
960
961 /*
962 * link_bundle_buf(): Append contents of a buffer to
963 * the tail of an existing one.
964 */
965
966 static int link_bundle_buf(struct link *l_ptr,
967 struct sk_buff *bundler,
968 struct sk_buff *buf)
969 {
970 struct tipc_msg *bundler_msg = buf_msg(bundler);
971 struct tipc_msg *msg = buf_msg(buf);
972 u32 size = msg_size(msg);
973 u32 bundle_size = msg_size(bundler_msg);
974 u32 to_pos = align(bundle_size);
975 u32 pad = to_pos - bundle_size;
976
977 if (msg_user(bundler_msg) != MSG_BUNDLER)
978 return 0;
979 if (msg_type(bundler_msg) != OPEN_MSG)
980 return 0;
981 if (skb_tailroom(bundler) < (pad + size))
982 return 0;
983 if (l_ptr->max_pkt < (to_pos + size))
984 return 0;
985
986 skb_put(bundler, pad + size);
987 skb_copy_to_linear_data_offset(bundler, to_pos, buf->data, size);
988 msg_set_size(bundler_msg, to_pos + size);
989 msg_set_msgcnt(bundler_msg, msg_msgcnt(bundler_msg) + 1);
990 dbg("Packed msg # %u(%u octets) into pos %u in buf(#%u)\n",
991 msg_msgcnt(bundler_msg), size, to_pos, msg_seqno(bundler_msg));
992 msg_dbg(msg, "PACKD:");
993 buf_discard(buf);
994 l_ptr->stats.sent_bundled++;
995 return 1;
996 }
997
998 static void link_add_to_outqueue(struct link *l_ptr,
999 struct sk_buff *buf,
1000 struct tipc_msg *msg)
1001 {
1002 u32 ack = mod(l_ptr->next_in_no - 1);
1003 u32 seqno = mod(l_ptr->next_out_no++);
1004
1005 msg_set_word(msg, 2, ((ack << 16) | seqno));
1006 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1007 buf->next = NULL;
1008 if (l_ptr->first_out) {
1009 l_ptr->last_out->next = buf;
1010 l_ptr->last_out = buf;
1011 } else
1012 l_ptr->first_out = l_ptr->last_out = buf;
1013 l_ptr->out_queue_size++;
1014 }
1015
1016 /*
1017 * tipc_link_send_buf() is the 'full path' for messages, called from
1018 * inside TIPC when the 'fast path' in tipc_send_buf
1019 * has failed, and from link_send()
1020 */
1021
1022 int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf)
1023 {
1024 struct tipc_msg *msg = buf_msg(buf);
1025 u32 size = msg_size(msg);
1026 u32 dsz = msg_data_sz(msg);
1027 u32 queue_size = l_ptr->out_queue_size;
1028 u32 imp = tipc_msg_tot_importance(msg);
1029 u32 queue_limit = l_ptr->queue_limit[imp];
1030 u32 max_packet = l_ptr->max_pkt;
1031
1032 msg_set_prevnode(msg, tipc_own_addr); /* If routed message */
1033
1034 /* Match msg importance against queue limits: */
1035
1036 if (unlikely(queue_size >= queue_limit)) {
1037 if (imp <= TIPC_CRITICAL_IMPORTANCE) {
1038 return link_schedule_port(l_ptr, msg_origport(msg),
1039 size);
1040 }
1041 msg_dbg(msg, "TIPC: Congestion, throwing away\n");
1042 buf_discard(buf);
1043 if (imp > CONN_MANAGER) {
1044 warn("Resetting link <%s>, send queue full", l_ptr->name);
1045 tipc_link_reset(l_ptr);
1046 }
1047 return dsz;
1048 }
1049
1050 /* Fragmentation needed ? */
1051
1052 if (size > max_packet)
1053 return tipc_link_send_long_buf(l_ptr, buf);
1054
1055 /* Packet can be queued or sent: */
1056
1057 if (queue_size > l_ptr->stats.max_queue_sz)
1058 l_ptr->stats.max_queue_sz = queue_size;
1059
1060 if (likely(!tipc_bearer_congested(l_ptr->b_ptr, l_ptr) &&
1061 !link_congested(l_ptr))) {
1062 link_add_to_outqueue(l_ptr, buf, msg);
1063
1064 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr))) {
1065 l_ptr->unacked_window = 0;
1066 } else {
1067 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1068 l_ptr->stats.bearer_congs++;
1069 l_ptr->next_out = buf;
1070 }
1071 return dsz;
1072 }
1073 /* Congestion: can message be bundled ?: */
1074
1075 if ((msg_user(msg) != CHANGEOVER_PROTOCOL) &&
1076 (msg_user(msg) != MSG_FRAGMENTER)) {
1077
1078 /* Try adding message to an existing bundle */
1079
1080 if (l_ptr->next_out &&
1081 link_bundle_buf(l_ptr, l_ptr->last_out, buf)) {
1082 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
1083 return dsz;
1084 }
1085
1086 /* Try creating a new bundle */
1087
1088 if (size <= max_packet * 2 / 3) {
1089 struct sk_buff *bundler = buf_acquire(max_packet);
1090 struct tipc_msg bundler_hdr;
1091
1092 if (bundler) {
1093 tipc_msg_init(&bundler_hdr, MSG_BUNDLER, OPEN_MSG,
1094 INT_H_SIZE, l_ptr->addr);
1095 skb_copy_to_linear_data(bundler, &bundler_hdr,
1096 INT_H_SIZE);
1097 skb_trim(bundler, INT_H_SIZE);
1098 link_bundle_buf(l_ptr, bundler, buf);
1099 buf = bundler;
1100 msg = buf_msg(buf);
1101 l_ptr->stats.sent_bundles++;
1102 }
1103 }
1104 }
1105 if (!l_ptr->next_out)
1106 l_ptr->next_out = buf;
1107 link_add_to_outqueue(l_ptr, buf, msg);
1108 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
1109 return dsz;
1110 }
1111
1112 /*
1113 * tipc_link_send(): same as tipc_link_send_buf(), but the link to use has
1114 * not been selected yet, and the the owner node is not locked
1115 * Called by TIPC internal users, e.g. the name distributor
1116 */
1117
1118 int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector)
1119 {
1120 struct link *l_ptr;
1121 struct tipc_node *n_ptr;
1122 int res = -ELINKCONG;
1123
1124 read_lock_bh(&tipc_net_lock);
1125 n_ptr = tipc_node_select(dest, selector);
1126 if (n_ptr) {
1127 tipc_node_lock(n_ptr);
1128 l_ptr = n_ptr->active_links[selector & 1];
1129 if (l_ptr) {
1130 dbg("tipc_link_send: found link %x for dest %x\n", l_ptr, dest);
1131 res = tipc_link_send_buf(l_ptr, buf);
1132 } else {
1133 dbg("Attempt to send msg to unreachable node:\n");
1134 msg_dbg(buf_msg(buf),">>>");
1135 buf_discard(buf);
1136 }
1137 tipc_node_unlock(n_ptr);
1138 } else {
1139 dbg("Attempt to send msg to unknown node:\n");
1140 msg_dbg(buf_msg(buf),">>>");
1141 buf_discard(buf);
1142 }
1143 read_unlock_bh(&tipc_net_lock);
1144 return res;
1145 }
1146
1147 /*
1148 * link_send_buf_fast: Entry for data messages where the
1149 * destination link is known and the header is complete,
1150 * inclusive total message length. Very time critical.
1151 * Link is locked. Returns user data length.
1152 */
1153
1154 static int link_send_buf_fast(struct link *l_ptr, struct sk_buff *buf,
1155 u32 *used_max_pkt)
1156 {
1157 struct tipc_msg *msg = buf_msg(buf);
1158 int res = msg_data_sz(msg);
1159
1160 if (likely(!link_congested(l_ptr))) {
1161 if (likely(msg_size(msg) <= l_ptr->max_pkt)) {
1162 if (likely(list_empty(&l_ptr->b_ptr->cong_links))) {
1163 link_add_to_outqueue(l_ptr, buf, msg);
1164 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf,
1165 &l_ptr->media_addr))) {
1166 l_ptr->unacked_window = 0;
1167 msg_dbg(msg,"SENT_FAST:");
1168 return res;
1169 }
1170 dbg("failed sent fast...\n");
1171 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1172 l_ptr->stats.bearer_congs++;
1173 l_ptr->next_out = buf;
1174 return res;
1175 }
1176 }
1177 else
1178 *used_max_pkt = l_ptr->max_pkt;
1179 }
1180 return tipc_link_send_buf(l_ptr, buf); /* All other cases */
1181 }
1182
1183 /*
1184 * tipc_send_buf_fast: Entry for data messages where the
1185 * destination node is known and the header is complete,
1186 * inclusive total message length.
1187 * Returns user data length.
1188 */
1189 int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode)
1190 {
1191 struct link *l_ptr;
1192 struct tipc_node *n_ptr;
1193 int res;
1194 u32 selector = msg_origport(buf_msg(buf)) & 1;
1195 u32 dummy;
1196
1197 if (destnode == tipc_own_addr)
1198 return tipc_port_recv_msg(buf);
1199
1200 read_lock_bh(&tipc_net_lock);
1201 n_ptr = tipc_node_select(destnode, selector);
1202 if (likely(n_ptr)) {
1203 tipc_node_lock(n_ptr);
1204 l_ptr = n_ptr->active_links[selector];
1205 dbg("send_fast: buf %x selected %x, destnode = %x\n",
1206 buf, l_ptr, destnode);
1207 if (likely(l_ptr)) {
1208 res = link_send_buf_fast(l_ptr, buf, &dummy);
1209 tipc_node_unlock(n_ptr);
1210 read_unlock_bh(&tipc_net_lock);
1211 return res;
1212 }
1213 tipc_node_unlock(n_ptr);
1214 }
1215 read_unlock_bh(&tipc_net_lock);
1216 res = msg_data_sz(buf_msg(buf));
1217 tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1218 return res;
1219 }
1220
1221
1222 /*
1223 * tipc_link_send_sections_fast: Entry for messages where the
1224 * destination processor is known and the header is complete,
1225 * except for total message length.
1226 * Returns user data length or errno.
1227 */
1228 int tipc_link_send_sections_fast(struct port *sender,
1229 struct iovec const *msg_sect,
1230 const u32 num_sect,
1231 u32 destaddr)
1232 {
1233 struct tipc_msg *hdr = &sender->publ.phdr;
1234 struct link *l_ptr;
1235 struct sk_buff *buf;
1236 struct tipc_node *node;
1237 int res;
1238 u32 selector = msg_origport(hdr) & 1;
1239
1240 again:
1241 /*
1242 * Try building message using port's max_pkt hint.
1243 * (Must not hold any locks while building message.)
1244 */
1245
1246 res = tipc_msg_build(hdr, msg_sect, num_sect, sender->publ.max_pkt,
1247 !sender->user_port, &buf);
1248
1249 read_lock_bh(&tipc_net_lock);
1250 node = tipc_node_select(destaddr, selector);
1251 if (likely(node)) {
1252 tipc_node_lock(node);
1253 l_ptr = node->active_links[selector];
1254 if (likely(l_ptr)) {
1255 if (likely(buf)) {
1256 res = link_send_buf_fast(l_ptr, buf,
1257 &sender->publ.max_pkt);
1258 if (unlikely(res < 0))
1259 buf_discard(buf);
1260 exit:
1261 tipc_node_unlock(node);
1262 read_unlock_bh(&tipc_net_lock);
1263 return res;
1264 }
1265
1266 /* Exit if build request was invalid */
1267
1268 if (unlikely(res < 0))
1269 goto exit;
1270
1271 /* Exit if link (or bearer) is congested */
1272
1273 if (link_congested(l_ptr) ||
1274 !list_empty(&l_ptr->b_ptr->cong_links)) {
1275 res = link_schedule_port(l_ptr,
1276 sender->publ.ref, res);
1277 goto exit;
1278 }
1279
1280 /*
1281 * Message size exceeds max_pkt hint; update hint,
1282 * then re-try fast path or fragment the message
1283 */
1284
1285 sender->publ.max_pkt = l_ptr->max_pkt;
1286 tipc_node_unlock(node);
1287 read_unlock_bh(&tipc_net_lock);
1288
1289
1290 if ((msg_hdr_sz(hdr) + res) <= sender->publ.max_pkt)
1291 goto again;
1292
1293 return link_send_sections_long(sender, msg_sect,
1294 num_sect, destaddr);
1295 }
1296 tipc_node_unlock(node);
1297 }
1298 read_unlock_bh(&tipc_net_lock);
1299
1300 /* Couldn't find a link to the destination node */
1301
1302 if (buf)
1303 return tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1304 if (res >= 0)
1305 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1306 TIPC_ERR_NO_NODE);
1307 return res;
1308 }
1309
1310 /*
1311 * link_send_sections_long(): Entry for long messages where the
1312 * destination node is known and the header is complete,
1313 * inclusive total message length.
1314 * Link and bearer congestion status have been checked to be ok,
1315 * and are ignored if they change.
1316 *
1317 * Note that fragments do not use the full link MTU so that they won't have
1318 * to undergo refragmentation if link changeover causes them to be sent
1319 * over another link with an additional tunnel header added as prefix.
1320 * (Refragmentation will still occur if the other link has a smaller MTU.)
1321 *
1322 * Returns user data length or errno.
1323 */
1324 static int link_send_sections_long(struct port *sender,
1325 struct iovec const *msg_sect,
1326 u32 num_sect,
1327 u32 destaddr)
1328 {
1329 struct link *l_ptr;
1330 struct tipc_node *node;
1331 struct tipc_msg *hdr = &sender->publ.phdr;
1332 u32 dsz = msg_data_sz(hdr);
1333 u32 max_pkt,fragm_sz,rest;
1334 struct tipc_msg fragm_hdr;
1335 struct sk_buff *buf,*buf_chain,*prev;
1336 u32 fragm_crs,fragm_rest,hsz,sect_rest;
1337 const unchar *sect_crs;
1338 int curr_sect;
1339 u32 fragm_no;
1340
1341 again:
1342 fragm_no = 1;
1343 max_pkt = sender->publ.max_pkt - INT_H_SIZE;
1344 /* leave room for tunnel header in case of link changeover */
1345 fragm_sz = max_pkt - INT_H_SIZE;
1346 /* leave room for fragmentation header in each fragment */
1347 rest = dsz;
1348 fragm_crs = 0;
1349 fragm_rest = 0;
1350 sect_rest = 0;
1351 sect_crs = NULL;
1352 curr_sect = -1;
1353
1354 /* Prepare reusable fragment header: */
1355
1356 msg_dbg(hdr, ">FRAGMENTING>");
1357 tipc_msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
1358 INT_H_SIZE, msg_destnode(hdr));
1359 msg_set_link_selector(&fragm_hdr, sender->publ.ref);
1360 msg_set_size(&fragm_hdr, max_pkt);
1361 msg_set_fragm_no(&fragm_hdr, 1);
1362
1363 /* Prepare header of first fragment: */
1364
1365 buf_chain = buf = buf_acquire(max_pkt);
1366 if (!buf)
1367 return -ENOMEM;
1368 buf->next = NULL;
1369 skb_copy_to_linear_data(buf, &fragm_hdr, INT_H_SIZE);
1370 hsz = msg_hdr_sz(hdr);
1371 skb_copy_to_linear_data_offset(buf, INT_H_SIZE, hdr, hsz);
1372 msg_dbg(buf_msg(buf), ">BUILD>");
1373
1374 /* Chop up message: */
1375
1376 fragm_crs = INT_H_SIZE + hsz;
1377 fragm_rest = fragm_sz - hsz;
1378
1379 do { /* For all sections */
1380 u32 sz;
1381
1382 if (!sect_rest) {
1383 sect_rest = msg_sect[++curr_sect].iov_len;
1384 sect_crs = (const unchar *)msg_sect[curr_sect].iov_base;
1385 }
1386
1387 if (sect_rest < fragm_rest)
1388 sz = sect_rest;
1389 else
1390 sz = fragm_rest;
1391
1392 if (likely(!sender->user_port)) {
1393 if (copy_from_user(buf->data + fragm_crs, sect_crs, sz)) {
1394 error:
1395 for (; buf_chain; buf_chain = buf) {
1396 buf = buf_chain->next;
1397 buf_discard(buf_chain);
1398 }
1399 return -EFAULT;
1400 }
1401 } else
1402 skb_copy_to_linear_data_offset(buf, fragm_crs,
1403 sect_crs, sz);
1404 sect_crs += sz;
1405 sect_rest -= sz;
1406 fragm_crs += sz;
1407 fragm_rest -= sz;
1408 rest -= sz;
1409
1410 if (!fragm_rest && rest) {
1411
1412 /* Initiate new fragment: */
1413 if (rest <= fragm_sz) {
1414 fragm_sz = rest;
1415 msg_set_type(&fragm_hdr,LAST_FRAGMENT);
1416 } else {
1417 msg_set_type(&fragm_hdr, FRAGMENT);
1418 }
1419 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
1420 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
1421 prev = buf;
1422 buf = buf_acquire(fragm_sz + INT_H_SIZE);
1423 if (!buf)
1424 goto error;
1425
1426 buf->next = NULL;
1427 prev->next = buf;
1428 skb_copy_to_linear_data(buf, &fragm_hdr, INT_H_SIZE);
1429 fragm_crs = INT_H_SIZE;
1430 fragm_rest = fragm_sz;
1431 msg_dbg(buf_msg(buf)," >BUILD>");
1432 }
1433 }
1434 while (rest > 0);
1435
1436 /*
1437 * Now we have a buffer chain. Select a link and check
1438 * that packet size is still OK
1439 */
1440 node = tipc_node_select(destaddr, sender->publ.ref & 1);
1441 if (likely(node)) {
1442 tipc_node_lock(node);
1443 l_ptr = node->active_links[sender->publ.ref & 1];
1444 if (!l_ptr) {
1445 tipc_node_unlock(node);
1446 goto reject;
1447 }
1448 if (l_ptr->max_pkt < max_pkt) {
1449 sender->publ.max_pkt = l_ptr->max_pkt;
1450 tipc_node_unlock(node);
1451 for (; buf_chain; buf_chain = buf) {
1452 buf = buf_chain->next;
1453 buf_discard(buf_chain);
1454 }
1455 goto again;
1456 }
1457 } else {
1458 reject:
1459 for (; buf_chain; buf_chain = buf) {
1460 buf = buf_chain->next;
1461 buf_discard(buf_chain);
1462 }
1463 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1464 TIPC_ERR_NO_NODE);
1465 }
1466
1467 /* Append whole chain to send queue: */
1468
1469 buf = buf_chain;
1470 l_ptr->long_msg_seq_no = mod(l_ptr->long_msg_seq_no + 1);
1471 if (!l_ptr->next_out)
1472 l_ptr->next_out = buf_chain;
1473 l_ptr->stats.sent_fragmented++;
1474 while (buf) {
1475 struct sk_buff *next = buf->next;
1476 struct tipc_msg *msg = buf_msg(buf);
1477
1478 l_ptr->stats.sent_fragments++;
1479 msg_set_long_msgno(msg, l_ptr->long_msg_seq_no);
1480 link_add_to_outqueue(l_ptr, buf, msg);
1481 msg_dbg(msg, ">ADD>");
1482 buf = next;
1483 }
1484
1485 /* Send it, if possible: */
1486
1487 tipc_link_push_queue(l_ptr);
1488 tipc_node_unlock(node);
1489 return dsz;
1490 }
1491
1492 /*
1493 * tipc_link_push_packet: Push one unsent packet to the media
1494 */
1495 u32 tipc_link_push_packet(struct link *l_ptr)
1496 {
1497 struct sk_buff *buf = l_ptr->first_out;
1498 u32 r_q_size = l_ptr->retransm_queue_size;
1499 u32 r_q_head = l_ptr->retransm_queue_head;
1500
1501 /* Step to position where retransmission failed, if any, */
1502 /* consider that buffers may have been released in meantime */
1503
1504 if (r_q_size && buf) {
1505 u32 last = lesser(mod(r_q_head + r_q_size),
1506 link_last_sent(l_ptr));
1507 u32 first = msg_seqno(buf_msg(buf));
1508
1509 while (buf && less(first, r_q_head)) {
1510 first = mod(first + 1);
1511 buf = buf->next;
1512 }
1513 l_ptr->retransm_queue_head = r_q_head = first;
1514 l_ptr->retransm_queue_size = r_q_size = mod(last - first);
1515 }
1516
1517 /* Continue retransmission now, if there is anything: */
1518
1519 if (r_q_size && buf) {
1520 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1521 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
1522 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1523 msg_dbg(buf_msg(buf), ">DEF-RETR>");
1524 l_ptr->retransm_queue_head = mod(++r_q_head);
1525 l_ptr->retransm_queue_size = --r_q_size;
1526 l_ptr->stats.retransmitted++;
1527 return 0;
1528 } else {
1529 l_ptr->stats.bearer_congs++;
1530 msg_dbg(buf_msg(buf), "|>DEF-RETR>");
1531 return PUSH_FAILED;
1532 }
1533 }
1534
1535 /* Send deferred protocol message, if any: */
1536
1537 buf = l_ptr->proto_msg_queue;
1538 if (buf) {
1539 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1540 msg_set_bcast_ack(buf_msg(buf),l_ptr->owner->bclink.last_in);
1541 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1542 msg_dbg(buf_msg(buf), ">DEF-PROT>");
1543 l_ptr->unacked_window = 0;
1544 buf_discard(buf);
1545 l_ptr->proto_msg_queue = NULL;
1546 return 0;
1547 } else {
1548 msg_dbg(buf_msg(buf), "|>DEF-PROT>");
1549 l_ptr->stats.bearer_congs++;
1550 return PUSH_FAILED;
1551 }
1552 }
1553
1554 /* Send one deferred data message, if send window not full: */
1555
1556 buf = l_ptr->next_out;
1557 if (buf) {
1558 struct tipc_msg *msg = buf_msg(buf);
1559 u32 next = msg_seqno(msg);
1560 u32 first = msg_seqno(buf_msg(l_ptr->first_out));
1561
1562 if (mod(next - first) < l_ptr->queue_limit[0]) {
1563 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1564 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1565 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1566 if (msg_user(msg) == MSG_BUNDLER)
1567 msg_set_type(msg, CLOSED_MSG);
1568 msg_dbg(msg, ">PUSH-DATA>");
1569 l_ptr->next_out = buf->next;
1570 return 0;
1571 } else {
1572 msg_dbg(msg, "|PUSH-DATA|");
1573 l_ptr->stats.bearer_congs++;
1574 return PUSH_FAILED;
1575 }
1576 }
1577 }
1578 return PUSH_FINISHED;
1579 }
1580
1581 /*
1582 * push_queue(): push out the unsent messages of a link where
1583 * congestion has abated. Node is locked
1584 */
1585 void tipc_link_push_queue(struct link *l_ptr)
1586 {
1587 u32 res;
1588
1589 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr))
1590 return;
1591
1592 do {
1593 res = tipc_link_push_packet(l_ptr);
1594 } while (!res);
1595
1596 if (res == PUSH_FAILED)
1597 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1598 }
1599
1600 static void link_reset_all(unsigned long addr)
1601 {
1602 struct tipc_node *n_ptr;
1603 char addr_string[16];
1604 u32 i;
1605
1606 read_lock_bh(&tipc_net_lock);
1607 n_ptr = tipc_node_find((u32)addr);
1608 if (!n_ptr) {
1609 read_unlock_bh(&tipc_net_lock);
1610 return; /* node no longer exists */
1611 }
1612
1613 tipc_node_lock(n_ptr);
1614
1615 warn("Resetting all links to %s\n",
1616 tipc_addr_string_fill(addr_string, n_ptr->addr));
1617
1618 for (i = 0; i < MAX_BEARERS; i++) {
1619 if (n_ptr->links[i]) {
1620 link_print(n_ptr->links[i], TIPC_OUTPUT,
1621 "Resetting link\n");
1622 tipc_link_reset(n_ptr->links[i]);
1623 }
1624 }
1625
1626 tipc_node_unlock(n_ptr);
1627 read_unlock_bh(&tipc_net_lock);
1628 }
1629
1630 static void link_retransmit_failure(struct link *l_ptr, struct sk_buff *buf)
1631 {
1632 struct tipc_msg *msg = buf_msg(buf);
1633
1634 warn("Retransmission failure on link <%s>\n", l_ptr->name);
1635 tipc_msg_dbg(TIPC_OUTPUT, msg, ">RETR-FAIL>");
1636
1637 if (l_ptr->addr) {
1638
1639 /* Handle failure on standard link */
1640
1641 link_print(l_ptr, TIPC_OUTPUT, "Resetting link\n");
1642 tipc_link_reset(l_ptr);
1643
1644 } else {
1645
1646 /* Handle failure on broadcast link */
1647
1648 struct tipc_node *n_ptr;
1649 char addr_string[16];
1650
1651 tipc_printf(TIPC_OUTPUT, "Msg seq number: %u, ", msg_seqno(msg));
1652 tipc_printf(TIPC_OUTPUT, "Outstanding acks: %lu\n",
1653 (unsigned long) TIPC_SKB_CB(buf)->handle);
1654
1655 n_ptr = l_ptr->owner->next;
1656 tipc_node_lock(n_ptr);
1657
1658 tipc_addr_string_fill(addr_string, n_ptr->addr);
1659 tipc_printf(TIPC_OUTPUT, "Multicast link info for %s\n", addr_string);
1660 tipc_printf(TIPC_OUTPUT, "Supported: %d, ", n_ptr->bclink.supported);
1661 tipc_printf(TIPC_OUTPUT, "Acked: %u\n", n_ptr->bclink.acked);
1662 tipc_printf(TIPC_OUTPUT, "Last in: %u, ", n_ptr->bclink.last_in);
1663 tipc_printf(TIPC_OUTPUT, "Gap after: %u, ", n_ptr->bclink.gap_after);
1664 tipc_printf(TIPC_OUTPUT, "Gap to: %u\n", n_ptr->bclink.gap_to);
1665 tipc_printf(TIPC_OUTPUT, "Nack sync: %u\n\n", n_ptr->bclink.nack_sync);
1666
1667 tipc_k_signal((Handler)link_reset_all, (unsigned long)n_ptr->addr);
1668
1669 tipc_node_unlock(n_ptr);
1670
1671 l_ptr->stale_count = 0;
1672 }
1673 }
1674
1675 void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
1676 u32 retransmits)
1677 {
1678 struct tipc_msg *msg;
1679
1680 if (!buf)
1681 return;
1682
1683 msg = buf_msg(buf);
1684
1685 dbg("Retransmitting %u in link %x\n", retransmits, l_ptr);
1686
1687 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
1688 if (l_ptr->retransm_queue_size == 0) {
1689 msg_dbg(msg, ">NO_RETR->BCONG>");
1690 dbg_print_link(l_ptr, " ");
1691 l_ptr->retransm_queue_head = msg_seqno(msg);
1692 l_ptr->retransm_queue_size = retransmits;
1693 } else {
1694 err("Unexpected retransmit on link %s (qsize=%d)\n",
1695 l_ptr->name, l_ptr->retransm_queue_size);
1696 }
1697 return;
1698 } else {
1699 /* Detect repeated retransmit failures on uncongested bearer */
1700
1701 if (l_ptr->last_retransmitted == msg_seqno(msg)) {
1702 if (++l_ptr->stale_count > 100) {
1703 link_retransmit_failure(l_ptr, buf);
1704 return;
1705 }
1706 } else {
1707 l_ptr->last_retransmitted = msg_seqno(msg);
1708 l_ptr->stale_count = 1;
1709 }
1710 }
1711
1712 while (retransmits && (buf != l_ptr->next_out) && buf) {
1713 msg = buf_msg(buf);
1714 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1715 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1716 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1717 msg_dbg(buf_msg(buf), ">RETR>");
1718 buf = buf->next;
1719 retransmits--;
1720 l_ptr->stats.retransmitted++;
1721 } else {
1722 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1723 l_ptr->stats.bearer_congs++;
1724 l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
1725 l_ptr->retransm_queue_size = retransmits;
1726 return;
1727 }
1728 }
1729
1730 l_ptr->retransm_queue_head = l_ptr->retransm_queue_size = 0;
1731 }
1732
1733 /**
1734 * link_insert_deferred_queue - insert deferred messages back into receive chain
1735 */
1736
1737 static struct sk_buff *link_insert_deferred_queue(struct link *l_ptr,
1738 struct sk_buff *buf)
1739 {
1740 u32 seq_no;
1741
1742 if (l_ptr->oldest_deferred_in == NULL)
1743 return buf;
1744
1745 seq_no = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1746 if (seq_no == mod(l_ptr->next_in_no)) {
1747 l_ptr->newest_deferred_in->next = buf;
1748 buf = l_ptr->oldest_deferred_in;
1749 l_ptr->oldest_deferred_in = NULL;
1750 l_ptr->deferred_inqueue_sz = 0;
1751 }
1752 return buf;
1753 }
1754
1755 /**
1756 * link_recv_buf_validate - validate basic format of received message
1757 *
1758 * This routine ensures a TIPC message has an acceptable header, and at least
1759 * as much data as the header indicates it should. The routine also ensures
1760 * that the entire message header is stored in the main fragment of the message
1761 * buffer, to simplify future access to message header fields.
1762 *
1763 * Note: Having extra info present in the message header or data areas is OK.
1764 * TIPC will ignore the excess, under the assumption that it is optional info
1765 * introduced by a later release of the protocol.
1766 */
1767
1768 static int link_recv_buf_validate(struct sk_buff *buf)
1769 {
1770 static u32 min_data_hdr_size[8] = {
1771 SHORT_H_SIZE, MCAST_H_SIZE, LONG_H_SIZE, DIR_MSG_H_SIZE,
1772 MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE
1773 };
1774
1775 struct tipc_msg *msg;
1776 u32 tipc_hdr[2];
1777 u32 size;
1778 u32 hdr_size;
1779 u32 min_hdr_size;
1780
1781 if (unlikely(buf->len < MIN_H_SIZE))
1782 return 0;
1783
1784 msg = skb_header_pointer(buf, 0, sizeof(tipc_hdr), tipc_hdr);
1785 if (msg == NULL)
1786 return 0;
1787
1788 if (unlikely(msg_version(msg) != TIPC_VERSION))
1789 return 0;
1790
1791 size = msg_size(msg);
1792 hdr_size = msg_hdr_sz(msg);
1793 min_hdr_size = msg_isdata(msg) ?
1794 min_data_hdr_size[msg_type(msg)] : INT_H_SIZE;
1795
1796 if (unlikely((hdr_size < min_hdr_size) ||
1797 (size < hdr_size) ||
1798 (buf->len < size) ||
1799 (size - hdr_size > TIPC_MAX_USER_MSG_SIZE)))
1800 return 0;
1801
1802 return pskb_may_pull(buf, hdr_size);
1803 }
1804
1805 void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *tb_ptr)
1806 {
1807 read_lock_bh(&tipc_net_lock);
1808 while (head) {
1809 struct bearer *b_ptr = (struct bearer *)tb_ptr;
1810 struct tipc_node *n_ptr;
1811 struct link *l_ptr;
1812 struct sk_buff *crs;
1813 struct sk_buff *buf = head;
1814 struct tipc_msg *msg;
1815 u32 seq_no;
1816 u32 ackd;
1817 u32 released = 0;
1818 int type;
1819
1820 head = head->next;
1821
1822 /* Ensure message is well-formed */
1823
1824 if (unlikely(!link_recv_buf_validate(buf)))
1825 goto cont;
1826
1827 /* Ensure message data is a single contiguous unit */
1828
1829 if (unlikely(buf_linearize(buf))) {
1830 goto cont;
1831 }
1832
1833 /* Handle arrival of a non-unicast link message */
1834
1835 msg = buf_msg(buf);
1836
1837 if (unlikely(msg_non_seq(msg))) {
1838 if (msg_user(msg) == LINK_CONFIG)
1839 tipc_disc_recv_msg(buf, b_ptr);
1840 else
1841 tipc_bclink_recv_pkt(buf);
1842 continue;
1843 }
1844
1845 if (unlikely(!msg_short(msg) &&
1846 (msg_destnode(msg) != tipc_own_addr)))
1847 goto cont;
1848
1849 /* Discard non-routeable messages destined for another node */
1850
1851 if (unlikely(!msg_isdata(msg) &&
1852 (msg_destnode(msg) != tipc_own_addr))) {
1853 if ((msg_user(msg) != CONN_MANAGER) &&
1854 (msg_user(msg) != MSG_FRAGMENTER))
1855 goto cont;
1856 }
1857
1858 /* Locate unicast link endpoint that should handle message */
1859
1860 n_ptr = tipc_node_find(msg_prevnode(msg));
1861 if (unlikely(!n_ptr))
1862 goto cont;
1863 tipc_node_lock(n_ptr);
1864
1865 l_ptr = n_ptr->links[b_ptr->identity];
1866 if (unlikely(!l_ptr)) {
1867 tipc_node_unlock(n_ptr);
1868 goto cont;
1869 }
1870
1871 /* Validate message sequence number info */
1872
1873 seq_no = msg_seqno(msg);
1874 ackd = msg_ack(msg);
1875
1876 /* Release acked messages */
1877
1878 if (less(n_ptr->bclink.acked, msg_bcast_ack(msg))) {
1879 if (tipc_node_is_up(n_ptr) && n_ptr->bclink.supported)
1880 tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
1881 }
1882
1883 crs = l_ptr->first_out;
1884 while ((crs != l_ptr->next_out) &&
1885 less_eq(msg_seqno(buf_msg(crs)), ackd)) {
1886 struct sk_buff *next = crs->next;
1887
1888 buf_discard(crs);
1889 crs = next;
1890 released++;
1891 }
1892 if (released) {
1893 l_ptr->first_out = crs;
1894 l_ptr->out_queue_size -= released;
1895 }
1896
1897 /* Try sending any messages link endpoint has pending */
1898
1899 if (unlikely(l_ptr->next_out))
1900 tipc_link_push_queue(l_ptr);
1901 if (unlikely(!list_empty(&l_ptr->waiting_ports)))
1902 tipc_link_wakeup_ports(l_ptr, 0);
1903 if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
1904 l_ptr->stats.sent_acks++;
1905 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
1906 }
1907
1908 /* Now (finally!) process the incoming message */
1909
1910 protocol_check:
1911 if (likely(link_working_working(l_ptr))) {
1912 if (likely(seq_no == mod(l_ptr->next_in_no))) {
1913 l_ptr->next_in_no++;
1914 if (unlikely(l_ptr->oldest_deferred_in))
1915 head = link_insert_deferred_queue(l_ptr,
1916 head);
1917 if (likely(msg_is_dest(msg, tipc_own_addr))) {
1918 deliver:
1919 if (likely(msg_isdata(msg))) {
1920 tipc_node_unlock(n_ptr);
1921 tipc_port_recv_msg(buf);
1922 continue;
1923 }
1924 switch (msg_user(msg)) {
1925 case MSG_BUNDLER:
1926 l_ptr->stats.recv_bundles++;
1927 l_ptr->stats.recv_bundled +=
1928 msg_msgcnt(msg);
1929 tipc_node_unlock(n_ptr);
1930 tipc_link_recv_bundle(buf);
1931 continue;
1932 case ROUTE_DISTRIBUTOR:
1933 tipc_node_unlock(n_ptr);
1934 tipc_cltr_recv_routing_table(buf);
1935 continue;
1936 case NAME_DISTRIBUTOR:
1937 tipc_node_unlock(n_ptr);
1938 tipc_named_recv(buf);
1939 continue;
1940 case CONN_MANAGER:
1941 tipc_node_unlock(n_ptr);
1942 tipc_port_recv_proto_msg(buf);
1943 continue;
1944 case MSG_FRAGMENTER:
1945 l_ptr->stats.recv_fragments++;
1946 if (tipc_link_recv_fragment(&l_ptr->defragm_buf,
1947 &buf, &msg)) {
1948 l_ptr->stats.recv_fragmented++;
1949 goto deliver;
1950 }
1951 break;
1952 case CHANGEOVER_PROTOCOL:
1953 type = msg_type(msg);
1954 if (link_recv_changeover_msg(&l_ptr, &buf)) {
1955 msg = buf_msg(buf);
1956 seq_no = msg_seqno(msg);
1957 if (type == ORIGINAL_MSG)
1958 goto deliver;
1959 goto protocol_check;
1960 }
1961 break;
1962 }
1963 }
1964 tipc_node_unlock(n_ptr);
1965 tipc_net_route_msg(buf);
1966 continue;
1967 }
1968 link_handle_out_of_seq_msg(l_ptr, buf);
1969 head = link_insert_deferred_queue(l_ptr, head);
1970 tipc_node_unlock(n_ptr);
1971 continue;
1972 }
1973
1974 if (msg_user(msg) == LINK_PROTOCOL) {
1975 link_recv_proto_msg(l_ptr, buf);
1976 head = link_insert_deferred_queue(l_ptr, head);
1977 tipc_node_unlock(n_ptr);
1978 continue;
1979 }
1980 msg_dbg(msg,"NSEQ<REC<");
1981 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1982
1983 if (link_working_working(l_ptr)) {
1984 /* Re-insert in front of queue */
1985 msg_dbg(msg,"RECV-REINS:");
1986 buf->next = head;
1987 head = buf;
1988 tipc_node_unlock(n_ptr);
1989 continue;
1990 }
1991 tipc_node_unlock(n_ptr);
1992 cont:
1993 buf_discard(buf);
1994 }
1995 read_unlock_bh(&tipc_net_lock);
1996 }
1997
1998 /*
1999 * link_defer_buf(): Sort a received out-of-sequence packet
2000 * into the deferred reception queue.
2001 * Returns the increase of the queue length,i.e. 0 or 1
2002 */
2003
2004 u32 tipc_link_defer_pkt(struct sk_buff **head,
2005 struct sk_buff **tail,
2006 struct sk_buff *buf)
2007 {
2008 struct sk_buff *prev = NULL;
2009 struct sk_buff *crs = *head;
2010 u32 seq_no = msg_seqno(buf_msg(buf));
2011
2012 buf->next = NULL;
2013
2014 /* Empty queue ? */
2015 if (*head == NULL) {
2016 *head = *tail = buf;
2017 return 1;
2018 }
2019
2020 /* Last ? */
2021 if (less(msg_seqno(buf_msg(*tail)), seq_no)) {
2022 (*tail)->next = buf;
2023 *tail = buf;
2024 return 1;
2025 }
2026
2027 /* Scan through queue and sort it in */
2028 do {
2029 struct tipc_msg *msg = buf_msg(crs);
2030
2031 if (less(seq_no, msg_seqno(msg))) {
2032 buf->next = crs;
2033 if (prev)
2034 prev->next = buf;
2035 else
2036 *head = buf;
2037 return 1;
2038 }
2039 if (seq_no == msg_seqno(msg)) {
2040 break;
2041 }
2042 prev = crs;
2043 crs = crs->next;
2044 }
2045 while (crs);
2046
2047 /* Message is a duplicate of an existing message */
2048
2049 buf_discard(buf);
2050 return 0;
2051 }
2052
2053 /**
2054 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
2055 */
2056
2057 static void link_handle_out_of_seq_msg(struct link *l_ptr,
2058 struct sk_buff *buf)
2059 {
2060 u32 seq_no = msg_seqno(buf_msg(buf));
2061
2062 if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
2063 link_recv_proto_msg(l_ptr, buf);
2064 return;
2065 }
2066
2067 dbg("rx OOS msg: seq_no %u, expecting %u (%u)\n",
2068 seq_no, mod(l_ptr->next_in_no), l_ptr->next_in_no);
2069
2070 /* Record OOS packet arrival (force mismatch on next timeout) */
2071
2072 l_ptr->checkpoint--;
2073
2074 /*
2075 * Discard packet if a duplicate; otherwise add it to deferred queue
2076 * and notify peer of gap as per protocol specification
2077 */
2078
2079 if (less(seq_no, mod(l_ptr->next_in_no))) {
2080 l_ptr->stats.duplicates++;
2081 buf_discard(buf);
2082 return;
2083 }
2084
2085 if (tipc_link_defer_pkt(&l_ptr->oldest_deferred_in,
2086 &l_ptr->newest_deferred_in, buf)) {
2087 l_ptr->deferred_inqueue_sz++;
2088 l_ptr->stats.deferred_recv++;
2089 if ((l_ptr->deferred_inqueue_sz % 16) == 1)
2090 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
2091 } else
2092 l_ptr->stats.duplicates++;
2093 }
2094
2095 /*
2096 * Send protocol message to the other endpoint.
2097 */
2098 void tipc_link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int probe_msg,
2099 u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
2100 {
2101 struct sk_buff *buf = NULL;
2102 struct tipc_msg *msg = l_ptr->pmsg;
2103 u32 msg_size = sizeof(l_ptr->proto_msg);
2104
2105 if (link_blocked(l_ptr))
2106 return;
2107 msg_set_type(msg, msg_typ);
2108 msg_set_net_plane(msg, l_ptr->b_ptr->net_plane);
2109 msg_set_bcast_ack(msg, mod(l_ptr->owner->bclink.last_in));
2110 msg_set_last_bcast(msg, tipc_bclink_get_last_sent());
2111
2112 if (msg_typ == STATE_MSG) {
2113 u32 next_sent = mod(l_ptr->next_out_no);
2114
2115 if (!tipc_link_is_up(l_ptr))
2116 return;
2117 if (l_ptr->next_out)
2118 next_sent = msg_seqno(buf_msg(l_ptr->next_out));
2119 msg_set_next_sent(msg, next_sent);
2120 if (l_ptr->oldest_deferred_in) {
2121 u32 rec = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
2122 gap = mod(rec - mod(l_ptr->next_in_no));
2123 }
2124 msg_set_seq_gap(msg, gap);
2125 if (gap)
2126 l_ptr->stats.sent_nacks++;
2127 msg_set_link_tolerance(msg, tolerance);
2128 msg_set_linkprio(msg, priority);
2129 msg_set_max_pkt(msg, ack_mtu);
2130 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
2131 msg_set_probe(msg, probe_msg != 0);
2132 if (probe_msg) {
2133 u32 mtu = l_ptr->max_pkt;
2134
2135 if ((mtu < l_ptr->max_pkt_target) &&
2136 link_working_working(l_ptr) &&
2137 l_ptr->fsm_msg_cnt) {
2138 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
2139 if (l_ptr->max_pkt_probes == 10) {
2140 l_ptr->max_pkt_target = (msg_size - 4);
2141 l_ptr->max_pkt_probes = 0;
2142 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
2143 }
2144 l_ptr->max_pkt_probes++;
2145 }
2146
2147 l_ptr->stats.sent_probes++;
2148 }
2149 l_ptr->stats.sent_states++;
2150 } else { /* RESET_MSG or ACTIVATE_MSG */
2151 msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
2152 msg_set_seq_gap(msg, 0);
2153 msg_set_next_sent(msg, 1);
2154 msg_set_link_tolerance(msg, l_ptr->tolerance);
2155 msg_set_linkprio(msg, l_ptr->priority);
2156 msg_set_max_pkt(msg, l_ptr->max_pkt_target);
2157 }
2158
2159 if (tipc_node_has_redundant_links(l_ptr->owner)) {
2160 msg_set_redundant_link(msg);
2161 } else {
2162 msg_clear_redundant_link(msg);
2163 }
2164 msg_set_linkprio(msg, l_ptr->priority);
2165
2166 /* Ensure sequence number will not fit : */
2167
2168 msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
2169
2170 /* Congestion? */
2171
2172 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
2173 if (!l_ptr->proto_msg_queue) {
2174 l_ptr->proto_msg_queue =
2175 buf_acquire(sizeof(l_ptr->proto_msg));
2176 }
2177 buf = l_ptr->proto_msg_queue;
2178 if (!buf)
2179 return;
2180 skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
2181 return;
2182 }
2183 msg_set_timestamp(msg, jiffies_to_msecs(jiffies));
2184
2185 /* Message can be sent */
2186
2187 msg_dbg(msg, ">>");
2188
2189 buf = buf_acquire(msg_size);
2190 if (!buf)
2191 return;
2192
2193 skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
2194 msg_set_size(buf_msg(buf), msg_size);
2195
2196 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
2197 l_ptr->unacked_window = 0;
2198 buf_discard(buf);
2199 return;
2200 }
2201
2202 /* New congestion */
2203 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
2204 l_ptr->proto_msg_queue = buf;
2205 l_ptr->stats.bearer_congs++;
2206 }
2207
2208 /*
2209 * Receive protocol message :
2210 * Note that network plane id propagates through the network, and may
2211 * change at any time. The node with lowest address rules
2212 */
2213
2214 static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf)
2215 {
2216 u32 rec_gap = 0;
2217 u32 max_pkt_info;
2218 u32 max_pkt_ack;
2219 u32 msg_tol;
2220 struct tipc_msg *msg = buf_msg(buf);
2221
2222 dbg("AT(%u):", jiffies_to_msecs(jiffies));
2223 msg_dbg(msg, "<<");
2224 if (link_blocked(l_ptr))
2225 goto exit;
2226
2227 /* record unnumbered packet arrival (force mismatch on next timeout) */
2228
2229 l_ptr->checkpoint--;
2230
2231 if (l_ptr->b_ptr->net_plane != msg_net_plane(msg))
2232 if (tipc_own_addr > msg_prevnode(msg))
2233 l_ptr->b_ptr->net_plane = msg_net_plane(msg);
2234
2235 l_ptr->owner->permit_changeover = msg_redundant_link(msg);
2236
2237 switch (msg_type(msg)) {
2238
2239 case RESET_MSG:
2240 if (!link_working_unknown(l_ptr) &&
2241 (l_ptr->peer_session != INVALID_SESSION)) {
2242 if (msg_session(msg) == l_ptr->peer_session) {
2243 dbg("Duplicate RESET: %u<->%u\n",
2244 msg_session(msg), l_ptr->peer_session);
2245 break; /* duplicate: ignore */
2246 }
2247 }
2248 /* fall thru' */
2249 case ACTIVATE_MSG:
2250 /* Update link settings according other endpoint's values */
2251
2252 strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
2253
2254 if ((msg_tol = msg_link_tolerance(msg)) &&
2255 (msg_tol > l_ptr->tolerance))
2256 link_set_supervision_props(l_ptr, msg_tol);
2257
2258 if (msg_linkprio(msg) > l_ptr->priority)
2259 l_ptr->priority = msg_linkprio(msg);
2260
2261 max_pkt_info = msg_max_pkt(msg);
2262 if (max_pkt_info) {
2263 if (max_pkt_info < l_ptr->max_pkt_target)
2264 l_ptr->max_pkt_target = max_pkt_info;
2265 if (l_ptr->max_pkt > l_ptr->max_pkt_target)
2266 l_ptr->max_pkt = l_ptr->max_pkt_target;
2267 } else {
2268 l_ptr->max_pkt = l_ptr->max_pkt_target;
2269 }
2270 l_ptr->owner->bclink.supported = (max_pkt_info != 0);
2271
2272 link_state_event(l_ptr, msg_type(msg));
2273
2274 l_ptr->peer_session = msg_session(msg);
2275 l_ptr->peer_bearer_id = msg_bearer_id(msg);
2276
2277 /* Synchronize broadcast sequence numbers */
2278 if (!tipc_node_has_redundant_links(l_ptr->owner)) {
2279 l_ptr->owner->bclink.last_in = mod(msg_last_bcast(msg));
2280 }
2281 break;
2282 case STATE_MSG:
2283
2284 if ((msg_tol = msg_link_tolerance(msg)))
2285 link_set_supervision_props(l_ptr, msg_tol);
2286
2287 if (msg_linkprio(msg) &&
2288 (msg_linkprio(msg) != l_ptr->priority)) {
2289 warn("Resetting link <%s>, priority change %u->%u\n",
2290 l_ptr->name, l_ptr->priority, msg_linkprio(msg));
2291 l_ptr->priority = msg_linkprio(msg);
2292 tipc_link_reset(l_ptr); /* Enforce change to take effect */
2293 break;
2294 }
2295 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
2296 l_ptr->stats.recv_states++;
2297 if (link_reset_unknown(l_ptr))
2298 break;
2299
2300 if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
2301 rec_gap = mod(msg_next_sent(msg) -
2302 mod(l_ptr->next_in_no));
2303 }
2304
2305 max_pkt_ack = msg_max_pkt(msg);
2306 if (max_pkt_ack > l_ptr->max_pkt) {
2307 dbg("Link <%s> updated MTU %u -> %u\n",
2308 l_ptr->name, l_ptr->max_pkt, max_pkt_ack);
2309 l_ptr->max_pkt = max_pkt_ack;
2310 l_ptr->max_pkt_probes = 0;
2311 }
2312
2313 max_pkt_ack = 0;
2314 if (msg_probe(msg)) {
2315 l_ptr->stats.recv_probes++;
2316 if (msg_size(msg) > sizeof(l_ptr->proto_msg)) {
2317 max_pkt_ack = msg_size(msg);
2318 }
2319 }
2320
2321 /* Protocol message before retransmits, reduce loss risk */
2322
2323 tipc_bclink_check_gap(l_ptr->owner, msg_last_bcast(msg));
2324
2325 if (rec_gap || (msg_probe(msg))) {
2326 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2327 0, rec_gap, 0, 0, max_pkt_ack);
2328 }
2329 if (msg_seq_gap(msg)) {
2330 msg_dbg(msg, "With Gap:");
2331 l_ptr->stats.recv_nacks++;
2332 tipc_link_retransmit(l_ptr, l_ptr->first_out,
2333 msg_seq_gap(msg));
2334 }
2335 break;
2336 default:
2337 msg_dbg(buf_msg(buf), "<DISCARDING UNKNOWN<");
2338 }
2339 exit:
2340 buf_discard(buf);
2341 }
2342
2343
2344 /*
2345 * tipc_link_tunnel(): Send one message via a link belonging to
2346 * another bearer. Owner node is locked.
2347 */
2348 void tipc_link_tunnel(struct link *l_ptr,
2349 struct tipc_msg *tunnel_hdr,
2350 struct tipc_msg *msg,
2351 u32 selector)
2352 {
2353 struct link *tunnel;
2354 struct sk_buff *buf;
2355 u32 length = msg_size(msg);
2356
2357 tunnel = l_ptr->owner->active_links[selector & 1];
2358 if (!tipc_link_is_up(tunnel)) {
2359 warn("Link changeover error, "
2360 "tunnel link no longer available\n");
2361 return;
2362 }
2363 msg_set_size(tunnel_hdr, length + INT_H_SIZE);
2364 buf = buf_acquire(length + INT_H_SIZE);
2365 if (!buf) {
2366 warn("Link changeover error, "
2367 "unable to send tunnel msg\n");
2368 return;
2369 }
2370 skb_copy_to_linear_data(buf, tunnel_hdr, INT_H_SIZE);
2371 skb_copy_to_linear_data_offset(buf, INT_H_SIZE, msg, length);
2372 dbg("%c->%c:", l_ptr->b_ptr->net_plane, tunnel->b_ptr->net_plane);
2373 msg_dbg(buf_msg(buf), ">SEND>");
2374 tipc_link_send_buf(tunnel, buf);
2375 }
2376
2377
2378
2379 /*
2380 * changeover(): Send whole message queue via the remaining link
2381 * Owner node is locked.
2382 */
2383
2384 void tipc_link_changeover(struct link *l_ptr)
2385 {
2386 u32 msgcount = l_ptr->out_queue_size;
2387 struct sk_buff *crs = l_ptr->first_out;
2388 struct link *tunnel = l_ptr->owner->active_links[0];
2389 struct tipc_msg tunnel_hdr;
2390 int split_bundles;
2391
2392 if (!tunnel)
2393 return;
2394
2395 if (!l_ptr->owner->permit_changeover) {
2396 warn("Link changeover error, "
2397 "peer did not permit changeover\n");
2398 return;
2399 }
2400
2401 tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2402 ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr);
2403 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2404 msg_set_msgcnt(&tunnel_hdr, msgcount);
2405 dbg("Link changeover requires %u tunnel messages\n", msgcount);
2406
2407 if (!l_ptr->first_out) {
2408 struct sk_buff *buf;
2409
2410 buf = buf_acquire(INT_H_SIZE);
2411 if (buf) {
2412 skb_copy_to_linear_data(buf, &tunnel_hdr, INT_H_SIZE);
2413 msg_set_size(&tunnel_hdr, INT_H_SIZE);
2414 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2415 tunnel->b_ptr->net_plane);
2416 msg_dbg(&tunnel_hdr, "EMPTY>SEND>");
2417 tipc_link_send_buf(tunnel, buf);
2418 } else {
2419 warn("Link changeover error, "
2420 "unable to send changeover msg\n");
2421 }
2422 return;
2423 }
2424
2425 split_bundles = (l_ptr->owner->active_links[0] !=
2426 l_ptr->owner->active_links[1]);
2427
2428 while (crs) {
2429 struct tipc_msg *msg = buf_msg(crs);
2430
2431 if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
2432 struct tipc_msg *m = msg_get_wrapped(msg);
2433 unchar* pos = (unchar*)m;
2434
2435 msgcount = msg_msgcnt(msg);
2436 while (msgcount--) {
2437 msg_set_seqno(m,msg_seqno(msg));
2438 tipc_link_tunnel(l_ptr, &tunnel_hdr, m,
2439 msg_link_selector(m));
2440 pos += align(msg_size(m));
2441 m = (struct tipc_msg *)pos;
2442 }
2443 } else {
2444 tipc_link_tunnel(l_ptr, &tunnel_hdr, msg,
2445 msg_link_selector(msg));
2446 }
2447 crs = crs->next;
2448 }
2449 }
2450
2451 void tipc_link_send_duplicate(struct link *l_ptr, struct link *tunnel)
2452 {
2453 struct sk_buff *iter;
2454 struct tipc_msg tunnel_hdr;
2455
2456 tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2457 DUPLICATE_MSG, INT_H_SIZE, l_ptr->addr);
2458 msg_set_msgcnt(&tunnel_hdr, l_ptr->out_queue_size);
2459 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2460 iter = l_ptr->first_out;
2461 while (iter) {
2462 struct sk_buff *outbuf;
2463 struct tipc_msg *msg = buf_msg(iter);
2464 u32 length = msg_size(msg);
2465
2466 if (msg_user(msg) == MSG_BUNDLER)
2467 msg_set_type(msg, CLOSED_MSG);
2468 msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
2469 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
2470 msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
2471 outbuf = buf_acquire(length + INT_H_SIZE);
2472 if (outbuf == NULL) {
2473 warn("Link changeover error, "
2474 "unable to send duplicate msg\n");
2475 return;
2476 }
2477 skb_copy_to_linear_data(outbuf, &tunnel_hdr, INT_H_SIZE);
2478 skb_copy_to_linear_data_offset(outbuf, INT_H_SIZE, iter->data,
2479 length);
2480 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2481 tunnel->b_ptr->net_plane);
2482 msg_dbg(buf_msg(outbuf), ">SEND>");
2483 tipc_link_send_buf(tunnel, outbuf);
2484 if (!tipc_link_is_up(l_ptr))
2485 return;
2486 iter = iter->next;
2487 }
2488 }
2489
2490
2491
2492 /**
2493 * buf_extract - extracts embedded TIPC message from another message
2494 * @skb: encapsulating message buffer
2495 * @from_pos: offset to extract from
2496 *
2497 * Returns a new message buffer containing an embedded message. The
2498 * encapsulating message itself is left unchanged.
2499 */
2500
2501 static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
2502 {
2503 struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
2504 u32 size = msg_size(msg);
2505 struct sk_buff *eb;
2506
2507 eb = buf_acquire(size);
2508 if (eb)
2509 skb_copy_to_linear_data(eb, msg, size);
2510 return eb;
2511 }
2512
2513 /*
2514 * link_recv_changeover_msg(): Receive tunneled packet sent
2515 * via other link. Node is locked. Return extracted buffer.
2516 */
2517
2518 static int link_recv_changeover_msg(struct link **l_ptr,
2519 struct sk_buff **buf)
2520 {
2521 struct sk_buff *tunnel_buf = *buf;
2522 struct link *dest_link;
2523 struct tipc_msg *msg;
2524 struct tipc_msg *tunnel_msg = buf_msg(tunnel_buf);
2525 u32 msg_typ = msg_type(tunnel_msg);
2526 u32 msg_count = msg_msgcnt(tunnel_msg);
2527
2528 dest_link = (*l_ptr)->owner->links[msg_bearer_id(tunnel_msg)];
2529 if (!dest_link) {
2530 msg_dbg(tunnel_msg, "NOLINK/<REC<");
2531 goto exit;
2532 }
2533 if (dest_link == *l_ptr) {
2534 err("Unexpected changeover message on link <%s>\n",
2535 (*l_ptr)->name);
2536 goto exit;
2537 }
2538 dbg("%c<-%c:", dest_link->b_ptr->net_plane,
2539 (*l_ptr)->b_ptr->net_plane);
2540 *l_ptr = dest_link;
2541 msg = msg_get_wrapped(tunnel_msg);
2542
2543 if (msg_typ == DUPLICATE_MSG) {
2544 if (less(msg_seqno(msg), mod(dest_link->next_in_no))) {
2545 msg_dbg(tunnel_msg, "DROP/<REC<");
2546 goto exit;
2547 }
2548 *buf = buf_extract(tunnel_buf,INT_H_SIZE);
2549 if (*buf == NULL) {
2550 warn("Link changeover error, duplicate msg dropped\n");
2551 goto exit;
2552 }
2553 msg_dbg(tunnel_msg, "TNL<REC<");
2554 buf_discard(tunnel_buf);
2555 return 1;
2556 }
2557
2558 /* First original message ?: */
2559
2560 if (tipc_link_is_up(dest_link)) {
2561 msg_dbg(tunnel_msg, "UP/FIRST/<REC<");
2562 info("Resetting link <%s>, changeover initiated by peer\n",
2563 dest_link->name);
2564 tipc_link_reset(dest_link);
2565 dest_link->exp_msg_count = msg_count;
2566 dbg("Expecting %u tunnelled messages\n", msg_count);
2567 if (!msg_count)
2568 goto exit;
2569 } else if (dest_link->exp_msg_count == START_CHANGEOVER) {
2570 msg_dbg(tunnel_msg, "BLK/FIRST/<REC<");
2571 dest_link->exp_msg_count = msg_count;
2572 dbg("Expecting %u tunnelled messages\n", msg_count);
2573 if (!msg_count)
2574 goto exit;
2575 }
2576
2577 /* Receive original message */
2578
2579 if (dest_link->exp_msg_count == 0) {
2580 warn("Link switchover error, "
2581 "got too many tunnelled messages\n");
2582 msg_dbg(tunnel_msg, "OVERDUE/DROP/<REC<");
2583 dbg_print_link(dest_link, "LINK:");
2584 goto exit;
2585 }
2586 dest_link->exp_msg_count--;
2587 if (less(msg_seqno(msg), dest_link->reset_checkpoint)) {
2588 msg_dbg(tunnel_msg, "DROP/DUPL/<REC<");
2589 goto exit;
2590 } else {
2591 *buf = buf_extract(tunnel_buf, INT_H_SIZE);
2592 if (*buf != NULL) {
2593 msg_dbg(tunnel_msg, "TNL<REC<");
2594 buf_discard(tunnel_buf);
2595 return 1;
2596 } else {
2597 warn("Link changeover error, original msg dropped\n");
2598 }
2599 }
2600 exit:
2601 *buf = NULL;
2602 buf_discard(tunnel_buf);
2603 return 0;
2604 }
2605
2606 /*
2607 * Bundler functionality:
2608 */
2609 void tipc_link_recv_bundle(struct sk_buff *buf)
2610 {
2611 u32 msgcount = msg_msgcnt(buf_msg(buf));
2612 u32 pos = INT_H_SIZE;
2613 struct sk_buff *obuf;
2614
2615 msg_dbg(buf_msg(buf), "<BNDL<: ");
2616 while (msgcount--) {
2617 obuf = buf_extract(buf, pos);
2618 if (obuf == NULL) {
2619 warn("Link unable to unbundle message(s)\n");
2620 break;
2621 }
2622 pos += align(msg_size(buf_msg(obuf)));
2623 msg_dbg(buf_msg(obuf), " /");
2624 tipc_net_route_msg(obuf);
2625 }
2626 buf_discard(buf);
2627 }
2628
2629 /*
2630 * Fragmentation/defragmentation:
2631 */
2632
2633
2634 /*
2635 * tipc_link_send_long_buf: Entry for buffers needing fragmentation.
2636 * The buffer is complete, inclusive total message length.
2637 * Returns user data length.
2638 */
2639 int tipc_link_send_long_buf(struct link *l_ptr, struct sk_buff *buf)
2640 {
2641 struct tipc_msg *inmsg = buf_msg(buf);
2642 struct tipc_msg fragm_hdr;
2643 u32 insize = msg_size(inmsg);
2644 u32 dsz = msg_data_sz(inmsg);
2645 unchar *crs = buf->data;
2646 u32 rest = insize;
2647 u32 pack_sz = l_ptr->max_pkt;
2648 u32 fragm_sz = pack_sz - INT_H_SIZE;
2649 u32 fragm_no = 1;
2650 u32 destaddr;
2651
2652 if (msg_short(inmsg))
2653 destaddr = l_ptr->addr;
2654 else
2655 destaddr = msg_destnode(inmsg);
2656
2657 if (msg_routed(inmsg))
2658 msg_set_prevnode(inmsg, tipc_own_addr);
2659
2660 /* Prepare reusable fragment header: */
2661
2662 tipc_msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
2663 INT_H_SIZE, destaddr);
2664 msg_set_link_selector(&fragm_hdr, msg_link_selector(inmsg));
2665 msg_set_long_msgno(&fragm_hdr, mod(l_ptr->long_msg_seq_no++));
2666 msg_set_fragm_no(&fragm_hdr, fragm_no);
2667 l_ptr->stats.sent_fragmented++;
2668
2669 /* Chop up message: */
2670
2671 while (rest > 0) {
2672 struct sk_buff *fragm;
2673
2674 if (rest <= fragm_sz) {
2675 fragm_sz = rest;
2676 msg_set_type(&fragm_hdr, LAST_FRAGMENT);
2677 }
2678 fragm = buf_acquire(fragm_sz + INT_H_SIZE);
2679 if (fragm == NULL) {
2680 warn("Link unable to fragment message\n");
2681 dsz = -ENOMEM;
2682 goto exit;
2683 }
2684 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
2685 skb_copy_to_linear_data(fragm, &fragm_hdr, INT_H_SIZE);
2686 skb_copy_to_linear_data_offset(fragm, INT_H_SIZE, crs,
2687 fragm_sz);
2688 /* Send queued messages first, if any: */
2689
2690 l_ptr->stats.sent_fragments++;
2691 tipc_link_send_buf(l_ptr, fragm);
2692 if (!tipc_link_is_up(l_ptr))
2693 return dsz;
2694 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
2695 rest -= fragm_sz;
2696 crs += fragm_sz;
2697 msg_set_type(&fragm_hdr, FRAGMENT);
2698 }
2699 exit:
2700 buf_discard(buf);
2701 return dsz;
2702 }
2703
2704 /*
2705 * A pending message being re-assembled must store certain values
2706 * to handle subsequent fragments correctly. The following functions
2707 * help storing these values in unused, available fields in the
2708 * pending message. This makes dynamic memory allocation unecessary.
2709 */
2710
2711 static void set_long_msg_seqno(struct sk_buff *buf, u32 seqno)
2712 {
2713 msg_set_seqno(buf_msg(buf), seqno);
2714 }
2715
2716 static u32 get_fragm_size(struct sk_buff *buf)
2717 {
2718 return msg_ack(buf_msg(buf));
2719 }
2720
2721 static void set_fragm_size(struct sk_buff *buf, u32 sz)
2722 {
2723 msg_set_ack(buf_msg(buf), sz);
2724 }
2725
2726 static u32 get_expected_frags(struct sk_buff *buf)
2727 {
2728 return msg_bcast_ack(buf_msg(buf));
2729 }
2730
2731 static void set_expected_frags(struct sk_buff *buf, u32 exp)
2732 {
2733 msg_set_bcast_ack(buf_msg(buf), exp);
2734 }
2735
2736 static u32 get_timer_cnt(struct sk_buff *buf)
2737 {
2738 return msg_reroute_cnt(buf_msg(buf));
2739 }
2740
2741 static void incr_timer_cnt(struct sk_buff *buf)
2742 {
2743 msg_incr_reroute_cnt(buf_msg(buf));
2744 }
2745
2746 /*
2747 * tipc_link_recv_fragment(): Called with node lock on. Returns
2748 * the reassembled buffer if message is complete.
2749 */
2750 int tipc_link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb,
2751 struct tipc_msg **m)
2752 {
2753 struct sk_buff *prev = NULL;
2754 struct sk_buff *fbuf = *fb;
2755 struct tipc_msg *fragm = buf_msg(fbuf);
2756 struct sk_buff *pbuf = *pending;
2757 u32 long_msg_seq_no = msg_long_msgno(fragm);
2758
2759 *fb = NULL;
2760 msg_dbg(fragm,"FRG<REC<");
2761
2762 /* Is there an incomplete message waiting for this fragment? */
2763
2764 while (pbuf && ((msg_seqno(buf_msg(pbuf)) != long_msg_seq_no) ||
2765 (msg_orignode(fragm) != msg_orignode(buf_msg(pbuf))))) {
2766 prev = pbuf;
2767 pbuf = pbuf->next;
2768 }
2769
2770 if (!pbuf && (msg_type(fragm) == FIRST_FRAGMENT)) {
2771 struct tipc_msg *imsg = (struct tipc_msg *)msg_data(fragm);
2772 u32 msg_sz = msg_size(imsg);
2773 u32 fragm_sz = msg_data_sz(fragm);
2774 u32 exp_fragm_cnt = msg_sz/fragm_sz + !!(msg_sz % fragm_sz);
2775 u32 max = TIPC_MAX_USER_MSG_SIZE + LONG_H_SIZE;
2776 if (msg_type(imsg) == TIPC_MCAST_MSG)
2777 max = TIPC_MAX_USER_MSG_SIZE + MCAST_H_SIZE;
2778 if (msg_size(imsg) > max) {
2779 msg_dbg(fragm,"<REC<Oversized: ");
2780 buf_discard(fbuf);
2781 return 0;
2782 }
2783 pbuf = buf_acquire(msg_size(imsg));
2784 if (pbuf != NULL) {
2785 pbuf->next = *pending;
2786 *pending = pbuf;
2787 skb_copy_to_linear_data(pbuf, imsg,
2788 msg_data_sz(fragm));
2789 /* Prepare buffer for subsequent fragments. */
2790
2791 set_long_msg_seqno(pbuf, long_msg_seq_no);
2792 set_fragm_size(pbuf,fragm_sz);
2793 set_expected_frags(pbuf,exp_fragm_cnt - 1);
2794 } else {
2795 warn("Link unable to reassemble fragmented message\n");
2796 }
2797 buf_discard(fbuf);
2798 return 0;
2799 } else if (pbuf && (msg_type(fragm) != FIRST_FRAGMENT)) {
2800 u32 dsz = msg_data_sz(fragm);
2801 u32 fsz = get_fragm_size(pbuf);
2802 u32 crs = ((msg_fragm_no(fragm) - 1) * fsz);
2803 u32 exp_frags = get_expected_frags(pbuf) - 1;
2804 skb_copy_to_linear_data_offset(pbuf, crs,
2805 msg_data(fragm), dsz);
2806 buf_discard(fbuf);
2807
2808 /* Is message complete? */
2809
2810 if (exp_frags == 0) {
2811 if (prev)
2812 prev->next = pbuf->next;
2813 else
2814 *pending = pbuf->next;
2815 msg_reset_reroute_cnt(buf_msg(pbuf));
2816 *fb = pbuf;
2817 *m = buf_msg(pbuf);
2818 return 1;
2819 }
2820 set_expected_frags(pbuf,exp_frags);
2821 return 0;
2822 }
2823 dbg(" Discarding orphan fragment %x\n",fbuf);
2824 msg_dbg(fragm,"ORPHAN:");
2825 dbg("Pending long buffers:\n");
2826 dbg_print_buf_chain(*pending);
2827 buf_discard(fbuf);
2828 return 0;
2829 }
2830
2831 /**
2832 * link_check_defragm_bufs - flush stale incoming message fragments
2833 * @l_ptr: pointer to link
2834 */
2835
2836 static void link_check_defragm_bufs(struct link *l_ptr)
2837 {
2838 struct sk_buff *prev = NULL;
2839 struct sk_buff *next = NULL;
2840 struct sk_buff *buf = l_ptr->defragm_buf;
2841
2842 if (!buf)
2843 return;
2844 if (!link_working_working(l_ptr))
2845 return;
2846 while (buf) {
2847 u32 cnt = get_timer_cnt(buf);
2848
2849 next = buf->next;
2850 if (cnt < 4) {
2851 incr_timer_cnt(buf);
2852 prev = buf;
2853 } else {
2854 dbg(" Discarding incomplete long buffer\n");
2855 msg_dbg(buf_msg(buf), "LONG:");
2856 dbg_print_link(l_ptr, "curr:");
2857 dbg("Pending long buffers:\n");
2858 dbg_print_buf_chain(l_ptr->defragm_buf);
2859 if (prev)
2860 prev->next = buf->next;
2861 else
2862 l_ptr->defragm_buf = buf->next;
2863 buf_discard(buf);
2864 }
2865 buf = next;
2866 }
2867 }
2868
2869
2870
2871 static void link_set_supervision_props(struct link *l_ptr, u32 tolerance)
2872 {
2873 l_ptr->tolerance = tolerance;
2874 l_ptr->continuity_interval =
2875 ((tolerance / 4) > 500) ? 500 : tolerance / 4;
2876 l_ptr->abort_limit = tolerance / (l_ptr->continuity_interval / 4);
2877 }
2878
2879
2880 void tipc_link_set_queue_limits(struct link *l_ptr, u32 window)
2881 {
2882 /* Data messages from this node, inclusive FIRST_FRAGM */
2883 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE] = window;
2884 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE] = (window / 3) * 4;
2885 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE] = (window / 3) * 5;
2886 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE] = (window / 3) * 6;
2887 /* Transiting data messages,inclusive FIRST_FRAGM */
2888 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE + 4] = 300;
2889 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE + 4] = 600;
2890 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE + 4] = 900;
2891 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE + 4] = 1200;
2892 l_ptr->queue_limit[CONN_MANAGER] = 1200;
2893 l_ptr->queue_limit[ROUTE_DISTRIBUTOR] = 1200;
2894 l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
2895 l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
2896 /* FRAGMENT and LAST_FRAGMENT packets */
2897 l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
2898 }
2899
2900 /**
2901 * link_find_link - locate link by name
2902 * @name - ptr to link name string
2903 * @node - ptr to area to be filled with ptr to associated node
2904 *
2905 * Caller must hold 'tipc_net_lock' to ensure node and bearer are not deleted;
2906 * this also prevents link deletion.
2907 *
2908 * Returns pointer to link (or 0 if invalid link name).
2909 */
2910
2911 static struct link *link_find_link(const char *name, struct tipc_node **node)
2912 {
2913 struct link_name link_name_parts;
2914 struct bearer *b_ptr;
2915 struct link *l_ptr;
2916
2917 if (!link_name_validate(name, &link_name_parts))
2918 return NULL;
2919
2920 b_ptr = tipc_bearer_find_interface(link_name_parts.if_local);
2921 if (!b_ptr)
2922 return NULL;
2923
2924 *node = tipc_node_find(link_name_parts.addr_peer);
2925 if (!*node)
2926 return NULL;
2927
2928 l_ptr = (*node)->links[b_ptr->identity];
2929 if (!l_ptr || strcmp(l_ptr->name, name))
2930 return NULL;
2931
2932 return l_ptr;
2933 }
2934
2935 struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space,
2936 u16 cmd)
2937 {
2938 struct tipc_link_config *args;
2939 u32 new_value;
2940 struct link *l_ptr;
2941 struct tipc_node *node;
2942 int res;
2943
2944 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
2945 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
2946
2947 args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
2948 new_value = ntohl(args->value);
2949
2950 if (!strcmp(args->name, tipc_bclink_name)) {
2951 if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
2952 (tipc_bclink_set_queue_limits(new_value) == 0))
2953 return tipc_cfg_reply_none();
2954 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
2955 " (cannot change setting on broadcast link)");
2956 }
2957
2958 read_lock_bh(&tipc_net_lock);
2959 l_ptr = link_find_link(args->name, &node);
2960 if (!l_ptr) {
2961 read_unlock_bh(&tipc_net_lock);
2962 return tipc_cfg_reply_error_string("link not found");
2963 }
2964
2965 tipc_node_lock(node);
2966 res = -EINVAL;
2967 switch (cmd) {
2968 case TIPC_CMD_SET_LINK_TOL:
2969 if ((new_value >= TIPC_MIN_LINK_TOL) &&
2970 (new_value <= TIPC_MAX_LINK_TOL)) {
2971 link_set_supervision_props(l_ptr, new_value);
2972 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2973 0, 0, new_value, 0, 0);
2974 res = 0;
2975 }
2976 break;
2977 case TIPC_CMD_SET_LINK_PRI:
2978 if ((new_value >= TIPC_MIN_LINK_PRI) &&
2979 (new_value <= TIPC_MAX_LINK_PRI)) {
2980 l_ptr->priority = new_value;
2981 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2982 0, 0, 0, new_value, 0);
2983 res = 0;
2984 }
2985 break;
2986 case TIPC_CMD_SET_LINK_WINDOW:
2987 if ((new_value >= TIPC_MIN_LINK_WIN) &&
2988 (new_value <= TIPC_MAX_LINK_WIN)) {
2989 tipc_link_set_queue_limits(l_ptr, new_value);
2990 res = 0;
2991 }
2992 break;
2993 }
2994 tipc_node_unlock(node);
2995
2996 read_unlock_bh(&tipc_net_lock);
2997 if (res)
2998 return tipc_cfg_reply_error_string("cannot change link setting");
2999
3000 return tipc_cfg_reply_none();
3001 }
3002
3003 /**
3004 * link_reset_statistics - reset link statistics
3005 * @l_ptr: pointer to link
3006 */
3007
3008 static void link_reset_statistics(struct link *l_ptr)
3009 {
3010 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
3011 l_ptr->stats.sent_info = l_ptr->next_out_no;
3012 l_ptr->stats.recv_info = l_ptr->next_in_no;
3013 }
3014
3015 struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space)
3016 {
3017 char *link_name;
3018 struct link *l_ptr;
3019 struct tipc_node *node;
3020
3021 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
3022 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
3023
3024 link_name = (char *)TLV_DATA(req_tlv_area);
3025 if (!strcmp(link_name, tipc_bclink_name)) {
3026 if (tipc_bclink_reset_stats())
3027 return tipc_cfg_reply_error_string("link not found");
3028 return tipc_cfg_reply_none();
3029 }
3030
3031 read_lock_bh(&tipc_net_lock);
3032 l_ptr = link_find_link(link_name, &node);
3033 if (!l_ptr) {
3034 read_unlock_bh(&tipc_net_lock);
3035 return tipc_cfg_reply_error_string("link not found");
3036 }
3037
3038 tipc_node_lock(node);
3039 link_reset_statistics(l_ptr);
3040 tipc_node_unlock(node);
3041 read_unlock_bh(&tipc_net_lock);
3042 return tipc_cfg_reply_none();
3043 }
3044
3045 /**
3046 * percent - convert count to a percentage of total (rounding up or down)
3047 */
3048
3049 static u32 percent(u32 count, u32 total)
3050 {
3051 return (count * 100 + (total / 2)) / total;
3052 }
3053
3054 /**
3055 * tipc_link_stats - print link statistics
3056 * @name: link name
3057 * @buf: print buffer area
3058 * @buf_size: size of print buffer area
3059 *
3060 * Returns length of print buffer data string (or 0 if error)
3061 */
3062
3063 static int tipc_link_stats(const char *name, char *buf, const u32 buf_size)
3064 {
3065 struct print_buf pb;
3066 struct link *l_ptr;
3067 struct tipc_node *node;
3068 char *status;
3069 u32 profile_total = 0;
3070
3071 if (!strcmp(name, tipc_bclink_name))
3072 return tipc_bclink_stats(buf, buf_size);
3073
3074 tipc_printbuf_init(&pb, buf, buf_size);
3075
3076 read_lock_bh(&tipc_net_lock);
3077 l_ptr = link_find_link(name, &node);
3078 if (!l_ptr) {
3079 read_unlock_bh(&tipc_net_lock);
3080 return 0;
3081 }
3082 tipc_node_lock(node);
3083
3084 if (tipc_link_is_active(l_ptr))
3085 status = "ACTIVE";
3086 else if (tipc_link_is_up(l_ptr))
3087 status = "STANDBY";
3088 else
3089 status = "DEFUNCT";
3090 tipc_printf(&pb, "Link <%s>\n"
3091 " %s MTU:%u Priority:%u Tolerance:%u ms"
3092 " Window:%u packets\n",
3093 l_ptr->name, status, l_ptr->max_pkt,
3094 l_ptr->priority, l_ptr->tolerance, l_ptr->queue_limit[0]);
3095 tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
3096 l_ptr->next_in_no - l_ptr->stats.recv_info,
3097 l_ptr->stats.recv_fragments,
3098 l_ptr->stats.recv_fragmented,
3099 l_ptr->stats.recv_bundles,
3100 l_ptr->stats.recv_bundled);
3101 tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
3102 l_ptr->next_out_no - l_ptr->stats.sent_info,
3103 l_ptr->stats.sent_fragments,
3104 l_ptr->stats.sent_fragmented,
3105 l_ptr->stats.sent_bundles,
3106 l_ptr->stats.sent_bundled);
3107 profile_total = l_ptr->stats.msg_length_counts;
3108 if (!profile_total)
3109 profile_total = 1;
3110 tipc_printf(&pb, " TX profile sample:%u packets average:%u octets\n"
3111 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
3112 "-16354:%u%% -32768:%u%% -66000:%u%%\n",
3113 l_ptr->stats.msg_length_counts,
3114 l_ptr->stats.msg_lengths_total / profile_total,
3115 percent(l_ptr->stats.msg_length_profile[0], profile_total),
3116 percent(l_ptr->stats.msg_length_profile[1], profile_total),
3117 percent(l_ptr->stats.msg_length_profile[2], profile_total),
3118 percent(l_ptr->stats.msg_length_profile[3], profile_total),
3119 percent(l_ptr->stats.msg_length_profile[4], profile_total),
3120 percent(l_ptr->stats.msg_length_profile[5], profile_total),
3121 percent(l_ptr->stats.msg_length_profile[6], profile_total));
3122 tipc_printf(&pb, " RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
3123 l_ptr->stats.recv_states,
3124 l_ptr->stats.recv_probes,
3125 l_ptr->stats.recv_nacks,
3126 l_ptr->stats.deferred_recv,
3127 l_ptr->stats.duplicates);
3128 tipc_printf(&pb, " TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
3129 l_ptr->stats.sent_states,
3130 l_ptr->stats.sent_probes,
3131 l_ptr->stats.sent_nacks,
3132 l_ptr->stats.sent_acks,
3133 l_ptr->stats.retransmitted);
3134 tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
3135 l_ptr->stats.bearer_congs,
3136 l_ptr->stats.link_congs,
3137 l_ptr->stats.max_queue_sz,
3138 l_ptr->stats.queue_sz_counts
3139 ? (l_ptr->stats.accu_queue_sz / l_ptr->stats.queue_sz_counts)
3140 : 0);
3141
3142 tipc_node_unlock(node);
3143 read_unlock_bh(&tipc_net_lock);
3144 return tipc_printbuf_validate(&pb);
3145 }
3146
3147 #define MAX_LINK_STATS_INFO 2000
3148
3149 struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space)
3150 {
3151 struct sk_buff *buf;
3152 struct tlv_desc *rep_tlv;
3153 int str_len;
3154
3155 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
3156 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
3157
3158 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_LINK_STATS_INFO));
3159 if (!buf)
3160 return NULL;
3161
3162 rep_tlv = (struct tlv_desc *)buf->data;
3163
3164 str_len = tipc_link_stats((char *)TLV_DATA(req_tlv_area),
3165 (char *)TLV_DATA(rep_tlv), MAX_LINK_STATS_INFO);
3166 if (!str_len) {
3167 buf_discard(buf);
3168 return tipc_cfg_reply_error_string("link not found");
3169 }
3170
3171 skb_put(buf, TLV_SPACE(str_len));
3172 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
3173
3174 return buf;
3175 }
3176
3177 #if 0
3178 int link_control(const char *name, u32 op, u32 val)
3179 {
3180 int res = -EINVAL;
3181 struct link *l_ptr;
3182 u32 bearer_id;
3183 struct tipc_node * node;
3184 u32 a;
3185
3186 a = link_name2addr(name, &bearer_id);
3187 read_lock_bh(&tipc_net_lock);
3188 node = tipc_node_find(a);
3189 if (node) {
3190 tipc_node_lock(node);
3191 l_ptr = node->links[bearer_id];
3192 if (l_ptr) {
3193 if (op == TIPC_REMOVE_LINK) {
3194 struct bearer *b_ptr = l_ptr->b_ptr;
3195 spin_lock_bh(&b_ptr->publ.lock);
3196 tipc_link_delete(l_ptr);
3197 spin_unlock_bh(&b_ptr->publ.lock);
3198 }
3199 if (op == TIPC_CMD_BLOCK_LINK) {
3200 tipc_link_reset(l_ptr);
3201 l_ptr->blocked = 1;
3202 }
3203 if (op == TIPC_CMD_UNBLOCK_LINK) {
3204 l_ptr->blocked = 0;
3205 }
3206 res = 0;
3207 }
3208 tipc_node_unlock(node);
3209 }
3210 read_unlock_bh(&tipc_net_lock);
3211 return res;
3212 }
3213 #endif
3214
3215 /**
3216 * tipc_link_get_max_pkt - get maximum packet size to use when sending to destination
3217 * @dest: network address of destination node
3218 * @selector: used to select from set of active links
3219 *
3220 * If no active link can be found, uses default maximum packet size.
3221 */
3222
3223 u32 tipc_link_get_max_pkt(u32 dest, u32 selector)
3224 {
3225 struct tipc_node *n_ptr;
3226 struct link *l_ptr;
3227 u32 res = MAX_PKT_DEFAULT;
3228
3229 if (dest == tipc_own_addr)
3230 return MAX_MSG_SIZE;
3231
3232 read_lock_bh(&tipc_net_lock);
3233 n_ptr = tipc_node_select(dest, selector);
3234 if (n_ptr) {
3235 tipc_node_lock(n_ptr);
3236 l_ptr = n_ptr->active_links[selector & 1];
3237 if (l_ptr)
3238 res = l_ptr->max_pkt;
3239 tipc_node_unlock(n_ptr);
3240 }
3241 read_unlock_bh(&tipc_net_lock);
3242 return res;
3243 }
3244
3245 #if 0
3246 static void link_dump_rec_queue(struct link *l_ptr)
3247 {
3248 struct sk_buff *crs;
3249
3250 if (!l_ptr->oldest_deferred_in) {
3251 info("Reception queue empty\n");
3252 return;
3253 }
3254 info("Contents of Reception queue:\n");
3255 crs = l_ptr->oldest_deferred_in;
3256 while (crs) {
3257 if (crs->data == (void *)0x0000a3a3) {
3258 info("buffer %x invalid\n", crs);
3259 return;
3260 }
3261 msg_dbg(buf_msg(crs), "In rec queue:\n");
3262 crs = crs->next;
3263 }
3264 }
3265 #endif
3266
3267 static void link_dump_send_queue(struct link *l_ptr)
3268 {
3269 if (l_ptr->next_out) {
3270 info("\nContents of unsent queue:\n");
3271 dbg_print_buf_chain(l_ptr->next_out);
3272 }
3273 info("\nContents of send queue:\n");
3274 if (l_ptr->first_out) {
3275 dbg_print_buf_chain(l_ptr->first_out);
3276 }
3277 info("Empty send queue\n");
3278 }
3279
3280 static void link_print(struct link *l_ptr, struct print_buf *buf,
3281 const char *str)
3282 {
3283 tipc_printf(buf, str);
3284 if (link_reset_reset(l_ptr) || link_reset_unknown(l_ptr))
3285 return;
3286 tipc_printf(buf, "Link %x<%s>:",
3287 l_ptr->addr, l_ptr->b_ptr->publ.name);
3288 tipc_printf(buf, ": NXO(%u):", mod(l_ptr->next_out_no));
3289 tipc_printf(buf, "NXI(%u):", mod(l_ptr->next_in_no));
3290 tipc_printf(buf, "SQUE");
3291 if (l_ptr->first_out) {
3292 tipc_printf(buf, "[%u..", msg_seqno(buf_msg(l_ptr->first_out)));
3293 if (l_ptr->next_out)
3294 tipc_printf(buf, "%u..",
3295 msg_seqno(buf_msg(l_ptr->next_out)));
3296 tipc_printf(buf, "%u]", msg_seqno(buf_msg(l_ptr->last_out)));
3297 if ((mod(msg_seqno(buf_msg(l_ptr->last_out)) -
3298 msg_seqno(buf_msg(l_ptr->first_out)))
3299 != (l_ptr->out_queue_size - 1)) ||
3300 (l_ptr->last_out->next != NULL)) {
3301 tipc_printf(buf, "\nSend queue inconsistency\n");
3302 tipc_printf(buf, "first_out= %x ", l_ptr->first_out);
3303 tipc_printf(buf, "next_out= %x ", l_ptr->next_out);
3304 tipc_printf(buf, "last_out= %x ", l_ptr->last_out);
3305 link_dump_send_queue(l_ptr);
3306 }
3307 } else
3308 tipc_printf(buf, "[]");
3309 tipc_printf(buf, "SQSIZ(%u)", l_ptr->out_queue_size);
3310 if (l_ptr->oldest_deferred_in) {
3311 u32 o = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
3312 u32 n = msg_seqno(buf_msg(l_ptr->newest_deferred_in));
3313 tipc_printf(buf, ":RQUE[%u..%u]", o, n);
3314 if (l_ptr->deferred_inqueue_sz != mod((n + 1) - o)) {
3315 tipc_printf(buf, ":RQSIZ(%u)",
3316 l_ptr->deferred_inqueue_sz);
3317 }
3318 }
3319 if (link_working_unknown(l_ptr))
3320 tipc_printf(buf, ":WU");
3321 if (link_reset_reset(l_ptr))
3322 tipc_printf(buf, ":RR");
3323 if (link_reset_unknown(l_ptr))
3324 tipc_printf(buf, ":RU");
3325 if (link_working_working(l_ptr))
3326 tipc_printf(buf, ":WW");
3327 tipc_printf(buf, "\n");
3328 }
3329
linux-next