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Linux 2.6.33-rc6
[cris-mirror.git] / net / tipc / link.c
blob6f50f6423f634c4b2672263307b815ec767360cb
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 int link_working_working(struct link *l_ptr)
206 {
207 return (l_ptr->state == WORKING_WORKING);
208 }
209
210 static int link_working_unknown(struct link *l_ptr)
211 {
212 return (l_ptr->state == WORKING_UNKNOWN);
213 }
214
215 static int link_reset_unknown(struct link *l_ptr)
216 {
217 return (l_ptr->state == RESET_UNKNOWN);
218 }
219
220 static int link_reset_reset(struct link *l_ptr)
221 {
222 return (l_ptr->state == RESET_RESET);
223 }
224
225 static int link_blocked(struct link *l_ptr)
226 {
227 return (l_ptr->exp_msg_count || l_ptr->blocked);
228 }
229
230 static int link_congested(struct link *l_ptr)
231 {
232 return (l_ptr->out_queue_size >= l_ptr->queue_limit[0]);
233 }
234
235 static u32 link_max_pkt(struct link *l_ptr)
236 {
237 return l_ptr->max_pkt;
238 }
239
240 static void link_init_max_pkt(struct link *l_ptr)
241 {
242 u32 max_pkt;
243
244 max_pkt = (l_ptr->b_ptr->publ.mtu & ~3);
245 if (max_pkt > MAX_MSG_SIZE)
246 max_pkt = MAX_MSG_SIZE;
247
248 l_ptr->max_pkt_target = max_pkt;
249 if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
250 l_ptr->max_pkt = l_ptr->max_pkt_target;
251 else
252 l_ptr->max_pkt = MAX_PKT_DEFAULT;
253
254 l_ptr->max_pkt_probes = 0;
255 }
256
257 static u32 link_next_sent(struct link *l_ptr)
258 {
259 if (l_ptr->next_out)
260 return msg_seqno(buf_msg(l_ptr->next_out));
261 return mod(l_ptr->next_out_no);
262 }
263
264 static u32 link_last_sent(struct link *l_ptr)
265 {
266 return mod(link_next_sent(l_ptr) - 1);
267 }
268
269 /*
270 * Simple non-static link routines (i.e. referenced outside this file)
271 */
272
273 int tipc_link_is_up(struct link *l_ptr)
274 {
275 if (!l_ptr)
276 return 0;
277 return (link_working_working(l_ptr) || link_working_unknown(l_ptr));
278 }
279
280 int tipc_link_is_active(struct link *l_ptr)
281 {
282 return ((l_ptr->owner->active_links[0] == l_ptr) ||
283 (l_ptr->owner->active_links[1] == l_ptr));
284 }
285
286 /**
287 * link_name_validate - validate & (optionally) deconstruct link name
288 * @name - ptr to link name string
289 * @name_parts - ptr to area for link name components (or NULL if not needed)
290 *
291 * Returns 1 if link name is valid, otherwise 0.
292 */
293
294 static int link_name_validate(const char *name, struct link_name *name_parts)
295 {
296 char name_copy[TIPC_MAX_LINK_NAME];
297 char *addr_local;
298 char *if_local;
299 char *addr_peer;
300 char *if_peer;
301 char dummy;
302 u32 z_local, c_local, n_local;
303 u32 z_peer, c_peer, n_peer;
304 u32 if_local_len;
305 u32 if_peer_len;
306
307 /* copy link name & ensure length is OK */
308
309 name_copy[TIPC_MAX_LINK_NAME - 1] = 0;
310 /* need above in case non-Posix strncpy() doesn't pad with nulls */
311 strncpy(name_copy, name, TIPC_MAX_LINK_NAME);
312 if (name_copy[TIPC_MAX_LINK_NAME - 1] != 0)
313 return 0;
314
315 /* ensure all component parts of link name are present */
316
317 addr_local = name_copy;
318 if ((if_local = strchr(addr_local, ':')) == NULL)
319 return 0;
320 *(if_local++) = 0;
321 if ((addr_peer = strchr(if_local, '-')) == NULL)
322 return 0;
323 *(addr_peer++) = 0;
324 if_local_len = addr_peer - if_local;
325 if ((if_peer = strchr(addr_peer, ':')) == NULL)
326 return 0;
327 *(if_peer++) = 0;
328 if_peer_len = strlen(if_peer) + 1;
329
330 /* validate component parts of link name */
331
332 if ((sscanf(addr_local, "%u.%u.%u%c",
333 &z_local, &c_local, &n_local, &dummy) != 3) ||
334 (sscanf(addr_peer, "%u.%u.%u%c",
335 &z_peer, &c_peer, &n_peer, &dummy) != 3) ||
336 (z_local > 255) || (c_local > 4095) || (n_local > 4095) ||
337 (z_peer > 255) || (c_peer > 4095) || (n_peer > 4095) ||
338 (if_local_len <= 1) || (if_local_len > TIPC_MAX_IF_NAME) ||
339 (if_peer_len <= 1) || (if_peer_len > TIPC_MAX_IF_NAME) ||
340 (strspn(if_local, tipc_alphabet) != (if_local_len - 1)) ||
341 (strspn(if_peer, tipc_alphabet) != (if_peer_len - 1)))
342 return 0;
343
344 /* return link name components, if necessary */
345
346 if (name_parts) {
347 name_parts->addr_local = tipc_addr(z_local, c_local, n_local);
348 strcpy(name_parts->if_local, if_local);
349 name_parts->addr_peer = tipc_addr(z_peer, c_peer, n_peer);
350 strcpy(name_parts->if_peer, if_peer);
351 }
352 return 1;
353 }
354
355 /**
356 * link_timeout - handle expiration of link timer
357 * @l_ptr: pointer to link
358 *
359 * This routine must not grab "tipc_net_lock" to avoid a potential deadlock conflict
360 * with tipc_link_delete(). (There is no risk that the node will be deleted by
361 * another thread because tipc_link_delete() always cancels the link timer before
362 * tipc_node_delete() is called.)
363 */
364
365 static void link_timeout(struct link *l_ptr)
366 {
367 tipc_node_lock(l_ptr->owner);
368
369 /* update counters used in statistical profiling of send traffic */
370
371 l_ptr->stats.accu_queue_sz += l_ptr->out_queue_size;
372 l_ptr->stats.queue_sz_counts++;
373
374 if (l_ptr->out_queue_size > l_ptr->stats.max_queue_sz)
375 l_ptr->stats.max_queue_sz = l_ptr->out_queue_size;
376
377 if (l_ptr->first_out) {
378 struct tipc_msg *msg = buf_msg(l_ptr->first_out);
379 u32 length = msg_size(msg);
380
381 if ((msg_user(msg) == MSG_FRAGMENTER) &&
382 (msg_type(msg) == FIRST_FRAGMENT)) {
383 length = msg_size(msg_get_wrapped(msg));
384 }
385 if (length) {
386 l_ptr->stats.msg_lengths_total += length;
387 l_ptr->stats.msg_length_counts++;
388 if (length <= 64)
389 l_ptr->stats.msg_length_profile[0]++;
390 else if (length <= 256)
391 l_ptr->stats.msg_length_profile[1]++;
392 else if (length <= 1024)
393 l_ptr->stats.msg_length_profile[2]++;
394 else if (length <= 4096)
395 l_ptr->stats.msg_length_profile[3]++;
396 else if (length <= 16384)
397 l_ptr->stats.msg_length_profile[4]++;
398 else if (length <= 32768)
399 l_ptr->stats.msg_length_profile[5]++;
400 else
401 l_ptr->stats.msg_length_profile[6]++;
402 }
403 }
404
405 /* do all other link processing performed on a periodic basis */
406
407 link_check_defragm_bufs(l_ptr);
408
409 link_state_event(l_ptr, TIMEOUT_EVT);
410
411 if (l_ptr->next_out)
412 tipc_link_push_queue(l_ptr);
413
414 tipc_node_unlock(l_ptr->owner);
415 }
416
417 static void link_set_timer(struct link *l_ptr, u32 time)
418 {
419 k_start_timer(&l_ptr->timer, time);
420 }
421
422 /**
423 * tipc_link_create - create a new link
424 * @b_ptr: pointer to associated bearer
425 * @peer: network address of node at other end of link
426 * @media_addr: media address to use when sending messages over link
427 *
428 * Returns pointer to link.
429 */
430
431 struct link *tipc_link_create(struct bearer *b_ptr, const u32 peer,
432 const struct tipc_media_addr *media_addr)
433 {
434 struct link *l_ptr;
435 struct tipc_msg *msg;
436 char *if_name;
437
438 l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
439 if (!l_ptr) {
440 warn("Link creation failed, no memory\n");
441 return NULL;
442 }
443
444 if (LINK_LOG_BUF_SIZE) {
445 char *pb = kmalloc(LINK_LOG_BUF_SIZE, GFP_ATOMIC);
446
447 if (!pb) {
448 kfree(l_ptr);
449 warn("Link creation failed, no memory for print buffer\n");
450 return NULL;
451 }
452 tipc_printbuf_init(&l_ptr->print_buf, pb, LINK_LOG_BUF_SIZE);
453 }
454
455 l_ptr->addr = peer;
456 if_name = strchr(b_ptr->publ.name, ':') + 1;
457 sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:",
458 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
459 tipc_node(tipc_own_addr),
460 if_name,
461 tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
462 /* note: peer i/f is appended to link name by reset/activate */
463 memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
464 l_ptr->checkpoint = 1;
465 l_ptr->b_ptr = b_ptr;
466 link_set_supervision_props(l_ptr, b_ptr->media->tolerance);
467 l_ptr->state = RESET_UNKNOWN;
468
469 l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
470 msg = l_ptr->pmsg;
471 msg_init(msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, l_ptr->addr);
472 msg_set_size(msg, sizeof(l_ptr->proto_msg));
473 msg_set_session(msg, (tipc_random & 0xffff));
474 msg_set_bearer_id(msg, b_ptr->identity);
475 strcpy((char *)msg_data(msg), if_name);
476
477 l_ptr->priority = b_ptr->priority;
478 tipc_link_set_queue_limits(l_ptr, b_ptr->media->window);
479
480 link_init_max_pkt(l_ptr);
481
482 l_ptr->next_out_no = 1;
483 INIT_LIST_HEAD(&l_ptr->waiting_ports);
484
485 link_reset_statistics(l_ptr);
486
487 l_ptr->owner = tipc_node_attach_link(l_ptr);
488 if (!l_ptr->owner) {
489 if (LINK_LOG_BUF_SIZE)
490 kfree(l_ptr->print_buf.buf);
491 kfree(l_ptr);
492 return NULL;
493 }
494
495 k_init_timer(&l_ptr->timer, (Handler)link_timeout, (unsigned long)l_ptr);
496 list_add_tail(&l_ptr->link_list, &b_ptr->links);
497 tipc_k_signal((Handler)tipc_link_start, (unsigned long)l_ptr);
498
499 dbg("tipc_link_create(): tolerance = %u,cont intv = %u, abort_limit = %u\n",
500 l_ptr->tolerance, l_ptr->continuity_interval, l_ptr->abort_limit);
501
502 return l_ptr;
503 }
504
505 /**
506 * tipc_link_delete - delete a link
507 * @l_ptr: pointer to link
508 *
509 * Note: 'tipc_net_lock' is write_locked, bearer is locked.
510 * This routine must not grab the node lock until after link timer cancellation
511 * to avoid a potential deadlock situation.
512 */
513
514 void tipc_link_delete(struct link *l_ptr)
515 {
516 if (!l_ptr) {
517 err("Attempt to delete non-existent link\n");
518 return;
519 }
520
521 dbg("tipc_link_delete()\n");
522
523 k_cancel_timer(&l_ptr->timer);
524
525 tipc_node_lock(l_ptr->owner);
526 tipc_link_reset(l_ptr);
527 tipc_node_detach_link(l_ptr->owner, l_ptr);
528 tipc_link_stop(l_ptr);
529 list_del_init(&l_ptr->link_list);
530 if (LINK_LOG_BUF_SIZE)
531 kfree(l_ptr->print_buf.buf);
532 tipc_node_unlock(l_ptr->owner);
533 k_term_timer(&l_ptr->timer);
534 kfree(l_ptr);
535 }
536
537 void tipc_link_start(struct link *l_ptr)
538 {
539 dbg("tipc_link_start %x\n", l_ptr);
540 link_state_event(l_ptr, STARTING_EVT);
541 }
542
543 /**
544 * link_schedule_port - schedule port for deferred sending
545 * @l_ptr: pointer to link
546 * @origport: reference to sending port
547 * @sz: amount of data to be sent
548 *
549 * Schedules port for renewed sending of messages after link congestion
550 * has abated.
551 */
552
553 static int link_schedule_port(struct link *l_ptr, u32 origport, u32 sz)
554 {
555 struct port *p_ptr;
556
557 spin_lock_bh(&tipc_port_list_lock);
558 p_ptr = tipc_port_lock(origport);
559 if (p_ptr) {
560 if (!p_ptr->wakeup)
561 goto exit;
562 if (!list_empty(&p_ptr->wait_list))
563 goto exit;
564 p_ptr->congested_link = l_ptr;
565 p_ptr->publ.congested = 1;
566 p_ptr->waiting_pkts = 1 + ((sz - 1) / link_max_pkt(l_ptr));
567 list_add_tail(&p_ptr->wait_list, &l_ptr->waiting_ports);
568 l_ptr->stats.link_congs++;
569 exit:
570 tipc_port_unlock(p_ptr);
571 }
572 spin_unlock_bh(&tipc_port_list_lock);
573 return -ELINKCONG;
574 }
575
576 void tipc_link_wakeup_ports(struct link *l_ptr, int all)
577 {
578 struct port *p_ptr;
579 struct port *temp_p_ptr;
580 int win = l_ptr->queue_limit[0] - l_ptr->out_queue_size;
581
582 if (all)
583 win = 100000;
584 if (win <= 0)
585 return;
586 if (!spin_trylock_bh(&tipc_port_list_lock))
587 return;
588 if (link_congested(l_ptr))
589 goto exit;
590 list_for_each_entry_safe(p_ptr, temp_p_ptr, &l_ptr->waiting_ports,
591 wait_list) {
592 if (win <= 0)
593 break;
594 list_del_init(&p_ptr->wait_list);
595 p_ptr->congested_link = NULL;
596 spin_lock_bh(p_ptr->publ.lock);
597 p_ptr->publ.congested = 0;
598 p_ptr->wakeup(&p_ptr->publ);
599 win -= p_ptr->waiting_pkts;
600 spin_unlock_bh(p_ptr->publ.lock);
601 }
602
603 exit:
604 spin_unlock_bh(&tipc_port_list_lock);
605 }
606
607 /**
608 * link_release_outqueue - purge link's outbound message queue
609 * @l_ptr: pointer to link
610 */
611
612 static void link_release_outqueue(struct link *l_ptr)
613 {
614 struct sk_buff *buf = l_ptr->first_out;
615 struct sk_buff *next;
616
617 while (buf) {
618 next = buf->next;
619 buf_discard(buf);
620 buf = next;
621 }
622 l_ptr->first_out = NULL;
623 l_ptr->out_queue_size = 0;
624 }
625
626 /**
627 * tipc_link_reset_fragments - purge link's inbound message fragments queue
628 * @l_ptr: pointer to link
629 */
630
631 void tipc_link_reset_fragments(struct link *l_ptr)
632 {
633 struct sk_buff *buf = l_ptr->defragm_buf;
634 struct sk_buff *next;
635
636 while (buf) {
637 next = buf->next;
638 buf_discard(buf);
639 buf = next;
640 }
641 l_ptr->defragm_buf = NULL;
642 }
643
644 /**
645 * tipc_link_stop - purge all inbound and outbound messages associated with link
646 * @l_ptr: pointer to link
647 */
648
649 void tipc_link_stop(struct link *l_ptr)
650 {
651 struct sk_buff *buf;
652 struct sk_buff *next;
653
654 buf = l_ptr->oldest_deferred_in;
655 while (buf) {
656 next = buf->next;
657 buf_discard(buf);
658 buf = next;
659 }
660
661 buf = l_ptr->first_out;
662 while (buf) {
663 next = buf->next;
664 buf_discard(buf);
665 buf = next;
666 }
667
668 tipc_link_reset_fragments(l_ptr);
669
670 buf_discard(l_ptr->proto_msg_queue);
671 l_ptr->proto_msg_queue = NULL;
672 }
673
674 #if 0
675
676 /* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
677
678 static void link_recv_event(struct link_event *ev)
679 {
680 ev->fcn(ev->addr, ev->name, ev->up);
681 kfree(ev);
682 }
683
684 static void link_send_event(void (*fcn)(u32 a, char *n, int up),
685 struct link *l_ptr, int up)
686 {
687 struct link_event *ev;
688
689 ev = kmalloc(sizeof(*ev), GFP_ATOMIC);
690 if (!ev) {
691 warn("Link event allocation failure\n");
692 return;
693 }
694 ev->addr = l_ptr->addr;
695 ev->up = up;
696 ev->fcn = fcn;
697 memcpy(ev->name, l_ptr->name, TIPC_MAX_LINK_NAME);
698 tipc_k_signal((Handler)link_recv_event, (unsigned long)ev);
699 }
700
701 #else
702
703 #define link_send_event(fcn, l_ptr, up) do { } while (0)
704
705 #endif
706
707 void tipc_link_reset(struct link *l_ptr)
708 {
709 struct sk_buff *buf;
710 u32 prev_state = l_ptr->state;
711 u32 checkpoint = l_ptr->next_in_no;
712 int was_active_link = tipc_link_is_active(l_ptr);
713
714 msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff));
715
716 /* Link is down, accept any session */
717 l_ptr->peer_session = INVALID_SESSION;
718
719 /* Prepare for max packet size negotiation */
720 link_init_max_pkt(l_ptr);
721
722 l_ptr->state = RESET_UNKNOWN;
723 dbg_link_state("Resetting Link\n");
724
725 if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
726 return;
727
728 tipc_node_link_down(l_ptr->owner, l_ptr);
729 tipc_bearer_remove_dest(l_ptr->b_ptr, l_ptr->addr);
730 #if 0
731 tipc_printf(TIPC_CONS, "\nReset link <%s>\n", l_ptr->name);
732 dbg_link_dump();
733 #endif
734 if (was_active_link && tipc_node_has_active_links(l_ptr->owner) &&
735 l_ptr->owner->permit_changeover) {
736 l_ptr->reset_checkpoint = checkpoint;
737 l_ptr->exp_msg_count = START_CHANGEOVER;
738 }
739
740 /* Clean up all queues: */
741
742 link_release_outqueue(l_ptr);
743 buf_discard(l_ptr->proto_msg_queue);
744 l_ptr->proto_msg_queue = NULL;
745 buf = l_ptr->oldest_deferred_in;
746 while (buf) {
747 struct sk_buff *next = buf->next;
748 buf_discard(buf);
749 buf = next;
750 }
751 if (!list_empty(&l_ptr->waiting_ports))
752 tipc_link_wakeup_ports(l_ptr, 1);
753
754 l_ptr->retransm_queue_head = 0;
755 l_ptr->retransm_queue_size = 0;
756 l_ptr->last_out = NULL;
757 l_ptr->first_out = NULL;
758 l_ptr->next_out = NULL;
759 l_ptr->unacked_window = 0;
760 l_ptr->checkpoint = 1;
761 l_ptr->next_out_no = 1;
762 l_ptr->deferred_inqueue_sz = 0;
763 l_ptr->oldest_deferred_in = NULL;
764 l_ptr->newest_deferred_in = NULL;
765 l_ptr->fsm_msg_cnt = 0;
766 l_ptr->stale_count = 0;
767 link_reset_statistics(l_ptr);
768
769 link_send_event(tipc_cfg_link_event, l_ptr, 0);
770 if (!in_own_cluster(l_ptr->addr))
771 link_send_event(tipc_disc_link_event, l_ptr, 0);
772 }
773
774
775 static void link_activate(struct link *l_ptr)
776 {
777 l_ptr->next_in_no = l_ptr->stats.recv_info = 1;
778 tipc_node_link_up(l_ptr->owner, l_ptr);
779 tipc_bearer_add_dest(l_ptr->b_ptr, l_ptr->addr);
780 link_send_event(tipc_cfg_link_event, l_ptr, 1);
781 if (!in_own_cluster(l_ptr->addr))
782 link_send_event(tipc_disc_link_event, l_ptr, 1);
783 }
784
785 /**
786 * link_state_event - link finite state machine
787 * @l_ptr: pointer to link
788 * @event: state machine event to process
789 */
790
791 static void link_state_event(struct link *l_ptr, unsigned event)
792 {
793 struct link *other;
794 u32 cont_intv = l_ptr->continuity_interval;
795
796 if (!l_ptr->started && (event != STARTING_EVT))
797 return; /* Not yet. */
798
799 if (link_blocked(l_ptr)) {
800 if (event == TIMEOUT_EVT) {
801 link_set_timer(l_ptr, cont_intv);
802 }
803 return; /* Changeover going on */
804 }
805 dbg_link("STATE_EV: <%s> ", l_ptr->name);
806
807 switch (l_ptr->state) {
808 case WORKING_WORKING:
809 dbg_link("WW/");
810 switch (event) {
811 case TRAFFIC_MSG_EVT:
812 dbg_link("TRF-");
813 /* fall through */
814 case ACTIVATE_MSG:
815 dbg_link("ACT\n");
816 break;
817 case TIMEOUT_EVT:
818 dbg_link("TIM ");
819 if (l_ptr->next_in_no != l_ptr->checkpoint) {
820 l_ptr->checkpoint = l_ptr->next_in_no;
821 if (tipc_bclink_acks_missing(l_ptr->owner)) {
822 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
823 0, 0, 0, 0, 0);
824 l_ptr->fsm_msg_cnt++;
825 } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
826 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
827 1, 0, 0, 0, 0);
828 l_ptr->fsm_msg_cnt++;
829 }
830 link_set_timer(l_ptr, cont_intv);
831 break;
832 }
833 dbg_link(" -> WU\n");
834 l_ptr->state = WORKING_UNKNOWN;
835 l_ptr->fsm_msg_cnt = 0;
836 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
837 l_ptr->fsm_msg_cnt++;
838 link_set_timer(l_ptr, cont_intv / 4);
839 break;
840 case RESET_MSG:
841 dbg_link("RES -> RR\n");
842 info("Resetting link <%s>, requested by peer\n",
843 l_ptr->name);
844 tipc_link_reset(l_ptr);
845 l_ptr->state = RESET_RESET;
846 l_ptr->fsm_msg_cnt = 0;
847 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
848 l_ptr->fsm_msg_cnt++;
849 link_set_timer(l_ptr, cont_intv);
850 break;
851 default:
852 err("Unknown link event %u in WW state\n", event);
853 }
854 break;
855 case WORKING_UNKNOWN:
856 dbg_link("WU/");
857 switch (event) {
858 case TRAFFIC_MSG_EVT:
859 dbg_link("TRF-");
860 case ACTIVATE_MSG:
861 dbg_link("ACT -> WW\n");
862 l_ptr->state = WORKING_WORKING;
863 l_ptr->fsm_msg_cnt = 0;
864 link_set_timer(l_ptr, cont_intv);
865 break;
866 case RESET_MSG:
867 dbg_link("RES -> RR\n");
868 info("Resetting link <%s>, requested by peer "
869 "while probing\n", l_ptr->name);
870 tipc_link_reset(l_ptr);
871 l_ptr->state = RESET_RESET;
872 l_ptr->fsm_msg_cnt = 0;
873 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
874 l_ptr->fsm_msg_cnt++;
875 link_set_timer(l_ptr, cont_intv);
876 break;
877 case TIMEOUT_EVT:
878 dbg_link("TIM ");
879 if (l_ptr->next_in_no != l_ptr->checkpoint) {
880 dbg_link("-> WW \n");
881 l_ptr->state = WORKING_WORKING;
882 l_ptr->fsm_msg_cnt = 0;
883 l_ptr->checkpoint = l_ptr->next_in_no;
884 if (tipc_bclink_acks_missing(l_ptr->owner)) {
885 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
886 0, 0, 0, 0, 0);
887 l_ptr->fsm_msg_cnt++;
888 }
889 link_set_timer(l_ptr, cont_intv);
890 } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
891 dbg_link("Probing %u/%u,timer = %u ms)\n",
892 l_ptr->fsm_msg_cnt, l_ptr->abort_limit,
893 cont_intv / 4);
894 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
895 1, 0, 0, 0, 0);
896 l_ptr->fsm_msg_cnt++;
897 link_set_timer(l_ptr, cont_intv / 4);
898 } else { /* Link has failed */
899 dbg_link("-> RU (%u probes unanswered)\n",
900 l_ptr->fsm_msg_cnt);
901 warn("Resetting link <%s>, peer not responding\n",
902 l_ptr->name);
903 tipc_link_reset(l_ptr);
904 l_ptr->state = RESET_UNKNOWN;
905 l_ptr->fsm_msg_cnt = 0;
906 tipc_link_send_proto_msg(l_ptr, RESET_MSG,
907 0, 0, 0, 0, 0);
908 l_ptr->fsm_msg_cnt++;
909 link_set_timer(l_ptr, cont_intv);
910 }
911 break;
912 default:
913 err("Unknown link event %u in WU state\n", event);
914 }
915 break;
916 case RESET_UNKNOWN:
917 dbg_link("RU/");
918 switch (event) {
919 case TRAFFIC_MSG_EVT:
920 dbg_link("TRF-\n");
921 break;
922 case ACTIVATE_MSG:
923 other = l_ptr->owner->active_links[0];
924 if (other && link_working_unknown(other)) {
925 dbg_link("ACT\n");
926 break;
927 }
928 dbg_link("ACT -> WW\n");
929 l_ptr->state = WORKING_WORKING;
930 l_ptr->fsm_msg_cnt = 0;
931 link_activate(l_ptr);
932 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
933 l_ptr->fsm_msg_cnt++;
934 link_set_timer(l_ptr, cont_intv);
935 break;
936 case RESET_MSG:
937 dbg_link("RES \n");
938 dbg_link(" -> RR\n");
939 l_ptr->state = RESET_RESET;
940 l_ptr->fsm_msg_cnt = 0;
941 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 1, 0, 0, 0, 0);
942 l_ptr->fsm_msg_cnt++;
943 link_set_timer(l_ptr, cont_intv);
944 break;
945 case STARTING_EVT:
946 dbg_link("START-");
947 l_ptr->started = 1;
948 /* fall through */
949 case TIMEOUT_EVT:
950 dbg_link("TIM \n");
951 tipc_link_send_proto_msg(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
952 l_ptr->fsm_msg_cnt++;
953 link_set_timer(l_ptr, cont_intv);
954 break;
955 default:
956 err("Unknown link event %u in RU state\n", event);
957 }
958 break;
959 case RESET_RESET:
960 dbg_link("RR/ ");
961 switch (event) {
962 case TRAFFIC_MSG_EVT:
963 dbg_link("TRF-");
964 /* fall through */
965 case ACTIVATE_MSG:
966 other = l_ptr->owner->active_links[0];
967 if (other && link_working_unknown(other)) {
968 dbg_link("ACT\n");
969 break;
970 }
971 dbg_link("ACT -> WW\n");
972 l_ptr->state = WORKING_WORKING;
973 l_ptr->fsm_msg_cnt = 0;
974 link_activate(l_ptr);
975 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
976 l_ptr->fsm_msg_cnt++;
977 link_set_timer(l_ptr, cont_intv);
978 break;
979 case RESET_MSG:
980 dbg_link("RES\n");
981 break;
982 case TIMEOUT_EVT:
983 dbg_link("TIM\n");
984 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
985 l_ptr->fsm_msg_cnt++;
986 link_set_timer(l_ptr, cont_intv);
987 dbg_link("fsm_msg_cnt %u\n", l_ptr->fsm_msg_cnt);
988 break;
989 default:
990 err("Unknown link event %u in RR state\n", event);
991 }
992 break;
993 default:
994 err("Unknown link state %u/%u\n", l_ptr->state, event);
995 }
996 }
997
998 /*
999 * link_bundle_buf(): Append contents of a buffer to
1000 * the tail of an existing one.
1001 */
1002
1003 static int link_bundle_buf(struct link *l_ptr,
1004 struct sk_buff *bundler,
1005 struct sk_buff *buf)
1006 {
1007 struct tipc_msg *bundler_msg = buf_msg(bundler);
1008 struct tipc_msg *msg = buf_msg(buf);
1009 u32 size = msg_size(msg);
1010 u32 bundle_size = msg_size(bundler_msg);
1011 u32 to_pos = align(bundle_size);
1012 u32 pad = to_pos - bundle_size;
1013
1014 if (msg_user(bundler_msg) != MSG_BUNDLER)
1015 return 0;
1016 if (msg_type(bundler_msg) != OPEN_MSG)
1017 return 0;
1018 if (skb_tailroom(bundler) < (pad + size))
1019 return 0;
1020 if (link_max_pkt(l_ptr) < (to_pos + size))
1021 return 0;
1022
1023 skb_put(bundler, pad + size);
1024 skb_copy_to_linear_data_offset(bundler, to_pos, buf->data, size);
1025 msg_set_size(bundler_msg, to_pos + size);
1026 msg_set_msgcnt(bundler_msg, msg_msgcnt(bundler_msg) + 1);
1027 dbg("Packed msg # %u(%u octets) into pos %u in buf(#%u)\n",
1028 msg_msgcnt(bundler_msg), size, to_pos, msg_seqno(bundler_msg));
1029 msg_dbg(msg, "PACKD:");
1030 buf_discard(buf);
1031 l_ptr->stats.sent_bundled++;
1032 return 1;
1033 }
1034
1035 static void link_add_to_outqueue(struct link *l_ptr,
1036 struct sk_buff *buf,
1037 struct tipc_msg *msg)
1038 {
1039 u32 ack = mod(l_ptr->next_in_no - 1);
1040 u32 seqno = mod(l_ptr->next_out_no++);
1041
1042 msg_set_word(msg, 2, ((ack << 16) | seqno));
1043 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1044 buf->next = NULL;
1045 if (l_ptr->first_out) {
1046 l_ptr->last_out->next = buf;
1047 l_ptr->last_out = buf;
1048 } else
1049 l_ptr->first_out = l_ptr->last_out = buf;
1050 l_ptr->out_queue_size++;
1051 }
1052
1053 /*
1054 * tipc_link_send_buf() is the 'full path' for messages, called from
1055 * inside TIPC when the 'fast path' in tipc_send_buf
1056 * has failed, and from link_send()
1057 */
1058
1059 int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf)
1060 {
1061 struct tipc_msg *msg = buf_msg(buf);
1062 u32 size = msg_size(msg);
1063 u32 dsz = msg_data_sz(msg);
1064 u32 queue_size = l_ptr->out_queue_size;
1065 u32 imp = msg_tot_importance(msg);
1066 u32 queue_limit = l_ptr->queue_limit[imp];
1067 u32 max_packet = link_max_pkt(l_ptr);
1068
1069 msg_set_prevnode(msg, tipc_own_addr); /* If routed message */
1070
1071 /* Match msg importance against queue limits: */
1072
1073 if (unlikely(queue_size >= queue_limit)) {
1074 if (imp <= TIPC_CRITICAL_IMPORTANCE) {
1075 return link_schedule_port(l_ptr, msg_origport(msg),
1076 size);
1077 }
1078 msg_dbg(msg, "TIPC: Congestion, throwing away\n");
1079 buf_discard(buf);
1080 if (imp > CONN_MANAGER) {
1081 warn("Resetting link <%s>, send queue full", l_ptr->name);
1082 tipc_link_reset(l_ptr);
1083 }
1084 return dsz;
1085 }
1086
1087 /* Fragmentation needed ? */
1088
1089 if (size > max_packet)
1090 return tipc_link_send_long_buf(l_ptr, buf);
1091
1092 /* Packet can be queued or sent: */
1093
1094 if (queue_size > l_ptr->stats.max_queue_sz)
1095 l_ptr->stats.max_queue_sz = queue_size;
1096
1097 if (likely(!tipc_bearer_congested(l_ptr->b_ptr, l_ptr) &&
1098 !link_congested(l_ptr))) {
1099 link_add_to_outqueue(l_ptr, buf, msg);
1100
1101 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr))) {
1102 l_ptr->unacked_window = 0;
1103 } else {
1104 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1105 l_ptr->stats.bearer_congs++;
1106 l_ptr->next_out = buf;
1107 }
1108 return dsz;
1109 }
1110 /* Congestion: can message be bundled ?: */
1111
1112 if ((msg_user(msg) != CHANGEOVER_PROTOCOL) &&
1113 (msg_user(msg) != MSG_FRAGMENTER)) {
1114
1115 /* Try adding message to an existing bundle */
1116
1117 if (l_ptr->next_out &&
1118 link_bundle_buf(l_ptr, l_ptr->last_out, buf)) {
1119 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
1120 return dsz;
1121 }
1122
1123 /* Try creating a new bundle */
1124
1125 if (size <= max_packet * 2 / 3) {
1126 struct sk_buff *bundler = buf_acquire(max_packet);
1127 struct tipc_msg bundler_hdr;
1128
1129 if (bundler) {
1130 msg_init(&bundler_hdr, MSG_BUNDLER, OPEN_MSG,
1131 INT_H_SIZE, l_ptr->addr);
1132 skb_copy_to_linear_data(bundler, &bundler_hdr,
1133 INT_H_SIZE);
1134 skb_trim(bundler, INT_H_SIZE);
1135 link_bundle_buf(l_ptr, bundler, buf);
1136 buf = bundler;
1137 msg = buf_msg(buf);
1138 l_ptr->stats.sent_bundles++;
1139 }
1140 }
1141 }
1142 if (!l_ptr->next_out)
1143 l_ptr->next_out = buf;
1144 link_add_to_outqueue(l_ptr, buf, msg);
1145 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
1146 return dsz;
1147 }
1148
1149 /*
1150 * tipc_link_send(): same as tipc_link_send_buf(), but the link to use has
1151 * not been selected yet, and the the owner node is not locked
1152 * Called by TIPC internal users, e.g. the name distributor
1153 */
1154
1155 int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector)
1156 {
1157 struct link *l_ptr;
1158 struct tipc_node *n_ptr;
1159 int res = -ELINKCONG;
1160
1161 read_lock_bh(&tipc_net_lock);
1162 n_ptr = tipc_node_select(dest, selector);
1163 if (n_ptr) {
1164 tipc_node_lock(n_ptr);
1165 l_ptr = n_ptr->active_links[selector & 1];
1166 if (l_ptr) {
1167 dbg("tipc_link_send: found link %x for dest %x\n", l_ptr, dest);
1168 res = tipc_link_send_buf(l_ptr, buf);
1169 } else {
1170 dbg("Attempt to send msg to unreachable node:\n");
1171 msg_dbg(buf_msg(buf),">>>");
1172 buf_discard(buf);
1173 }
1174 tipc_node_unlock(n_ptr);
1175 } else {
1176 dbg("Attempt to send msg to unknown node:\n");
1177 msg_dbg(buf_msg(buf),">>>");
1178 buf_discard(buf);
1179 }
1180 read_unlock_bh(&tipc_net_lock);
1181 return res;
1182 }
1183
1184 /*
1185 * link_send_buf_fast: Entry for data messages where the
1186 * destination link is known and the header is complete,
1187 * inclusive total message length. Very time critical.
1188 * Link is locked. Returns user data length.
1189 */
1190
1191 static int link_send_buf_fast(struct link *l_ptr, struct sk_buff *buf,
1192 u32 *used_max_pkt)
1193 {
1194 struct tipc_msg *msg = buf_msg(buf);
1195 int res = msg_data_sz(msg);
1196
1197 if (likely(!link_congested(l_ptr))) {
1198 if (likely(msg_size(msg) <= link_max_pkt(l_ptr))) {
1199 if (likely(list_empty(&l_ptr->b_ptr->cong_links))) {
1200 link_add_to_outqueue(l_ptr, buf, msg);
1201 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf,
1202 &l_ptr->media_addr))) {
1203 l_ptr->unacked_window = 0;
1204 msg_dbg(msg,"SENT_FAST:");
1205 return res;
1206 }
1207 dbg("failed sent fast...\n");
1208 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1209 l_ptr->stats.bearer_congs++;
1210 l_ptr->next_out = buf;
1211 return res;
1212 }
1213 }
1214 else
1215 *used_max_pkt = link_max_pkt(l_ptr);
1216 }
1217 return tipc_link_send_buf(l_ptr, buf); /* All other cases */
1218 }
1219
1220 /*
1221 * tipc_send_buf_fast: Entry for data messages where the
1222 * destination node is known and the header is complete,
1223 * inclusive total message length.
1224 * Returns user data length.
1225 */
1226 int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode)
1227 {
1228 struct link *l_ptr;
1229 struct tipc_node *n_ptr;
1230 int res;
1231 u32 selector = msg_origport(buf_msg(buf)) & 1;
1232 u32 dummy;
1233
1234 if (destnode == tipc_own_addr)
1235 return tipc_port_recv_msg(buf);
1236
1237 read_lock_bh(&tipc_net_lock);
1238 n_ptr = tipc_node_select(destnode, selector);
1239 if (likely(n_ptr)) {
1240 tipc_node_lock(n_ptr);
1241 l_ptr = n_ptr->active_links[selector];
1242 dbg("send_fast: buf %x selected %x, destnode = %x\n",
1243 buf, l_ptr, destnode);
1244 if (likely(l_ptr)) {
1245 res = link_send_buf_fast(l_ptr, buf, &dummy);
1246 tipc_node_unlock(n_ptr);
1247 read_unlock_bh(&tipc_net_lock);
1248 return res;
1249 }
1250 tipc_node_unlock(n_ptr);
1251 }
1252 read_unlock_bh(&tipc_net_lock);
1253 res = msg_data_sz(buf_msg(buf));
1254 tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1255 return res;
1256 }
1257
1258
1259 /*
1260 * tipc_link_send_sections_fast: Entry for messages where the
1261 * destination processor is known and the header is complete,
1262 * except for total message length.
1263 * Returns user data length or errno.
1264 */
1265 int tipc_link_send_sections_fast(struct port *sender,
1266 struct iovec const *msg_sect,
1267 const u32 num_sect,
1268 u32 destaddr)
1269 {
1270 struct tipc_msg *hdr = &sender->publ.phdr;
1271 struct link *l_ptr;
1272 struct sk_buff *buf;
1273 struct tipc_node *node;
1274 int res;
1275 u32 selector = msg_origport(hdr) & 1;
1276
1277 again:
1278 /*
1279 * Try building message using port's max_pkt hint.
1280 * (Must not hold any locks while building message.)
1281 */
1282
1283 res = msg_build(hdr, msg_sect, num_sect, sender->publ.max_pkt,
1284 !sender->user_port, &buf);
1285
1286 read_lock_bh(&tipc_net_lock);
1287 node = tipc_node_select(destaddr, selector);
1288 if (likely(node)) {
1289 tipc_node_lock(node);
1290 l_ptr = node->active_links[selector];
1291 if (likely(l_ptr)) {
1292 if (likely(buf)) {
1293 res = link_send_buf_fast(l_ptr, buf,
1294 &sender->publ.max_pkt);
1295 if (unlikely(res < 0))
1296 buf_discard(buf);
1297 exit:
1298 tipc_node_unlock(node);
1299 read_unlock_bh(&tipc_net_lock);
1300 return res;
1301 }
1302
1303 /* Exit if build request was invalid */
1304
1305 if (unlikely(res < 0))
1306 goto exit;
1307
1308 /* Exit if link (or bearer) is congested */
1309
1310 if (link_congested(l_ptr) ||
1311 !list_empty(&l_ptr->b_ptr->cong_links)) {
1312 res = link_schedule_port(l_ptr,
1313 sender->publ.ref, res);
1314 goto exit;
1315 }
1316
1317 /*
1318 * Message size exceeds max_pkt hint; update hint,
1319 * then re-try fast path or fragment the message
1320 */
1321
1322 sender->publ.max_pkt = link_max_pkt(l_ptr);
1323 tipc_node_unlock(node);
1324 read_unlock_bh(&tipc_net_lock);
1325
1326
1327 if ((msg_hdr_sz(hdr) + res) <= sender->publ.max_pkt)
1328 goto again;
1329
1330 return link_send_sections_long(sender, msg_sect,
1331 num_sect, destaddr);
1332 }
1333 tipc_node_unlock(node);
1334 }
1335 read_unlock_bh(&tipc_net_lock);
1336
1337 /* Couldn't find a link to the destination node */
1338
1339 if (buf)
1340 return tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1341 if (res >= 0)
1342 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1343 TIPC_ERR_NO_NODE);
1344 return res;
1345 }
1346
1347 /*
1348 * link_send_sections_long(): Entry for long messages where the
1349 * destination node is known and the header is complete,
1350 * inclusive total message length.
1351 * Link and bearer congestion status have been checked to be ok,
1352 * and are ignored if they change.
1353 *
1354 * Note that fragments do not use the full link MTU so that they won't have
1355 * to undergo refragmentation if link changeover causes them to be sent
1356 * over another link with an additional tunnel header added as prefix.
1357 * (Refragmentation will still occur if the other link has a smaller MTU.)
1358 *
1359 * Returns user data length or errno.
1360 */
1361 static int link_send_sections_long(struct port *sender,
1362 struct iovec const *msg_sect,
1363 u32 num_sect,
1364 u32 destaddr)
1365 {
1366 struct link *l_ptr;
1367 struct tipc_node *node;
1368 struct tipc_msg *hdr = &sender->publ.phdr;
1369 u32 dsz = msg_data_sz(hdr);
1370 u32 max_pkt,fragm_sz,rest;
1371 struct tipc_msg fragm_hdr;
1372 struct sk_buff *buf,*buf_chain,*prev;
1373 u32 fragm_crs,fragm_rest,hsz,sect_rest;
1374 const unchar *sect_crs;
1375 int curr_sect;
1376 u32 fragm_no;
1377
1378 again:
1379 fragm_no = 1;
1380 max_pkt = sender->publ.max_pkt - INT_H_SIZE;
1381 /* leave room for tunnel header in case of link changeover */
1382 fragm_sz = max_pkt - INT_H_SIZE;
1383 /* leave room for fragmentation header in each fragment */
1384 rest = dsz;
1385 fragm_crs = 0;
1386 fragm_rest = 0;
1387 sect_rest = 0;
1388 sect_crs = NULL;
1389 curr_sect = -1;
1390
1391 /* Prepare reusable fragment header: */
1392
1393 msg_dbg(hdr, ">FRAGMENTING>");
1394 msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
1395 INT_H_SIZE, msg_destnode(hdr));
1396 msg_set_link_selector(&fragm_hdr, sender->publ.ref);
1397 msg_set_size(&fragm_hdr, max_pkt);
1398 msg_set_fragm_no(&fragm_hdr, 1);
1399
1400 /* Prepare header of first fragment: */
1401
1402 buf_chain = buf = buf_acquire(max_pkt);
1403 if (!buf)
1404 return -ENOMEM;
1405 buf->next = NULL;
1406 skb_copy_to_linear_data(buf, &fragm_hdr, INT_H_SIZE);
1407 hsz = msg_hdr_sz(hdr);
1408 skb_copy_to_linear_data_offset(buf, INT_H_SIZE, hdr, hsz);
1409 msg_dbg(buf_msg(buf), ">BUILD>");
1410
1411 /* Chop up message: */
1412
1413 fragm_crs = INT_H_SIZE + hsz;
1414 fragm_rest = fragm_sz - hsz;
1415
1416 do { /* For all sections */
1417 u32 sz;
1418
1419 if (!sect_rest) {
1420 sect_rest = msg_sect[++curr_sect].iov_len;
1421 sect_crs = (const unchar *)msg_sect[curr_sect].iov_base;
1422 }
1423
1424 if (sect_rest < fragm_rest)
1425 sz = sect_rest;
1426 else
1427 sz = fragm_rest;
1428
1429 if (likely(!sender->user_port)) {
1430 if (copy_from_user(buf->data + fragm_crs, sect_crs, sz)) {
1431 error:
1432 for (; buf_chain; buf_chain = buf) {
1433 buf = buf_chain->next;
1434 buf_discard(buf_chain);
1435 }
1436 return -EFAULT;
1437 }
1438 } else
1439 skb_copy_to_linear_data_offset(buf, fragm_crs,
1440 sect_crs, sz);
1441 sect_crs += sz;
1442 sect_rest -= sz;
1443 fragm_crs += sz;
1444 fragm_rest -= sz;
1445 rest -= sz;
1446
1447 if (!fragm_rest && rest) {
1448
1449 /* Initiate new fragment: */
1450 if (rest <= fragm_sz) {
1451 fragm_sz = rest;
1452 msg_set_type(&fragm_hdr,LAST_FRAGMENT);
1453 } else {
1454 msg_set_type(&fragm_hdr, FRAGMENT);
1455 }
1456 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
1457 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
1458 prev = buf;
1459 buf = buf_acquire(fragm_sz + INT_H_SIZE);
1460 if (!buf)
1461 goto error;
1462
1463 buf->next = NULL;
1464 prev->next = buf;
1465 skb_copy_to_linear_data(buf, &fragm_hdr, INT_H_SIZE);
1466 fragm_crs = INT_H_SIZE;
1467 fragm_rest = fragm_sz;
1468 msg_dbg(buf_msg(buf)," >BUILD>");
1469 }
1470 }
1471 while (rest > 0);
1472
1473 /*
1474 * Now we have a buffer chain. Select a link and check
1475 * that packet size is still OK
1476 */
1477 node = tipc_node_select(destaddr, sender->publ.ref & 1);
1478 if (likely(node)) {
1479 tipc_node_lock(node);
1480 l_ptr = node->active_links[sender->publ.ref & 1];
1481 if (!l_ptr) {
1482 tipc_node_unlock(node);
1483 goto reject;
1484 }
1485 if (link_max_pkt(l_ptr) < max_pkt) {
1486 sender->publ.max_pkt = link_max_pkt(l_ptr);
1487 tipc_node_unlock(node);
1488 for (; buf_chain; buf_chain = buf) {
1489 buf = buf_chain->next;
1490 buf_discard(buf_chain);
1491 }
1492 goto again;
1493 }
1494 } else {
1495 reject:
1496 for (; buf_chain; buf_chain = buf) {
1497 buf = buf_chain->next;
1498 buf_discard(buf_chain);
1499 }
1500 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1501 TIPC_ERR_NO_NODE);
1502 }
1503
1504 /* Append whole chain to send queue: */
1505
1506 buf = buf_chain;
1507 l_ptr->long_msg_seq_no = mod(l_ptr->long_msg_seq_no + 1);
1508 if (!l_ptr->next_out)
1509 l_ptr->next_out = buf_chain;
1510 l_ptr->stats.sent_fragmented++;
1511 while (buf) {
1512 struct sk_buff *next = buf->next;
1513 struct tipc_msg *msg = buf_msg(buf);
1514
1515 l_ptr->stats.sent_fragments++;
1516 msg_set_long_msgno(msg, l_ptr->long_msg_seq_no);
1517 link_add_to_outqueue(l_ptr, buf, msg);
1518 msg_dbg(msg, ">ADD>");
1519 buf = next;
1520 }
1521
1522 /* Send it, if possible: */
1523
1524 tipc_link_push_queue(l_ptr);
1525 tipc_node_unlock(node);
1526 return dsz;
1527 }
1528
1529 /*
1530 * tipc_link_push_packet: Push one unsent packet to the media
1531 */
1532 u32 tipc_link_push_packet(struct link *l_ptr)
1533 {
1534 struct sk_buff *buf = l_ptr->first_out;
1535 u32 r_q_size = l_ptr->retransm_queue_size;
1536 u32 r_q_head = l_ptr->retransm_queue_head;
1537
1538 /* Step to position where retransmission failed, if any, */
1539 /* consider that buffers may have been released in meantime */
1540
1541 if (r_q_size && buf) {
1542 u32 last = lesser(mod(r_q_head + r_q_size),
1543 link_last_sent(l_ptr));
1544 u32 first = msg_seqno(buf_msg(buf));
1545
1546 while (buf && less(first, r_q_head)) {
1547 first = mod(first + 1);
1548 buf = buf->next;
1549 }
1550 l_ptr->retransm_queue_head = r_q_head = first;
1551 l_ptr->retransm_queue_size = r_q_size = mod(last - first);
1552 }
1553
1554 /* Continue retransmission now, if there is anything: */
1555
1556 if (r_q_size && buf && !skb_cloned(buf)) {
1557 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1558 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
1559 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1560 msg_dbg(buf_msg(buf), ">DEF-RETR>");
1561 l_ptr->retransm_queue_head = mod(++r_q_head);
1562 l_ptr->retransm_queue_size = --r_q_size;
1563 l_ptr->stats.retransmitted++;
1564 return 0;
1565 } else {
1566 l_ptr->stats.bearer_congs++;
1567 msg_dbg(buf_msg(buf), "|>DEF-RETR>");
1568 return PUSH_FAILED;
1569 }
1570 }
1571
1572 /* Send deferred protocol message, if any: */
1573
1574 buf = l_ptr->proto_msg_queue;
1575 if (buf) {
1576 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1577 msg_set_bcast_ack(buf_msg(buf),l_ptr->owner->bclink.last_in);
1578 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1579 msg_dbg(buf_msg(buf), ">DEF-PROT>");
1580 l_ptr->unacked_window = 0;
1581 buf_discard(buf);
1582 l_ptr->proto_msg_queue = NULL;
1583 return 0;
1584 } else {
1585 msg_dbg(buf_msg(buf), "|>DEF-PROT>");
1586 l_ptr->stats.bearer_congs++;
1587 return PUSH_FAILED;
1588 }
1589 }
1590
1591 /* Send one deferred data message, if send window not full: */
1592
1593 buf = l_ptr->next_out;
1594 if (buf) {
1595 struct tipc_msg *msg = buf_msg(buf);
1596 u32 next = msg_seqno(msg);
1597 u32 first = msg_seqno(buf_msg(l_ptr->first_out));
1598
1599 if (mod(next - first) < l_ptr->queue_limit[0]) {
1600 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1601 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1602 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1603 if (msg_user(msg) == MSG_BUNDLER)
1604 msg_set_type(msg, CLOSED_MSG);
1605 msg_dbg(msg, ">PUSH-DATA>");
1606 l_ptr->next_out = buf->next;
1607 return 0;
1608 } else {
1609 msg_dbg(msg, "|PUSH-DATA|");
1610 l_ptr->stats.bearer_congs++;
1611 return PUSH_FAILED;
1612 }
1613 }
1614 }
1615 return PUSH_FINISHED;
1616 }
1617
1618 /*
1619 * push_queue(): push out the unsent messages of a link where
1620 * congestion has abated. Node is locked
1621 */
1622 void tipc_link_push_queue(struct link *l_ptr)
1623 {
1624 u32 res;
1625
1626 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr))
1627 return;
1628
1629 do {
1630 res = tipc_link_push_packet(l_ptr);
1631 } while (!res);
1632
1633 if (res == PUSH_FAILED)
1634 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1635 }
1636
1637 static void link_reset_all(unsigned long addr)
1638 {
1639 struct tipc_node *n_ptr;
1640 char addr_string[16];
1641 u32 i;
1642
1643 read_lock_bh(&tipc_net_lock);
1644 n_ptr = tipc_node_find((u32)addr);
1645 if (!n_ptr) {
1646 read_unlock_bh(&tipc_net_lock);
1647 return; /* node no longer exists */
1648 }
1649
1650 tipc_node_lock(n_ptr);
1651
1652 warn("Resetting all links to %s\n",
1653 addr_string_fill(addr_string, n_ptr->addr));
1654
1655 for (i = 0; i < MAX_BEARERS; i++) {
1656 if (n_ptr->links[i]) {
1657 link_print(n_ptr->links[i], TIPC_OUTPUT,
1658 "Resetting link\n");
1659 tipc_link_reset(n_ptr->links[i]);
1660 }
1661 }
1662
1663 tipc_node_unlock(n_ptr);
1664 read_unlock_bh(&tipc_net_lock);
1665 }
1666
1667 static void link_retransmit_failure(struct link *l_ptr, struct sk_buff *buf)
1668 {
1669 struct tipc_msg *msg = buf_msg(buf);
1670
1671 warn("Retransmission failure on link <%s>\n", l_ptr->name);
1672 tipc_msg_dbg(TIPC_OUTPUT, msg, ">RETR-FAIL>");
1673
1674 if (l_ptr->addr) {
1675
1676 /* Handle failure on standard link */
1677
1678 link_print(l_ptr, TIPC_OUTPUT, "Resetting link\n");
1679 tipc_link_reset(l_ptr);
1680
1681 } else {
1682
1683 /* Handle failure on broadcast link */
1684
1685 struct tipc_node *n_ptr;
1686 char addr_string[16];
1687
1688 tipc_printf(TIPC_OUTPUT, "Msg seq number: %u, ", msg_seqno(msg));
1689 tipc_printf(TIPC_OUTPUT, "Outstanding acks: %lu\n",
1690 (unsigned long) TIPC_SKB_CB(buf)->handle);
1691
1692 n_ptr = l_ptr->owner->next;
1693 tipc_node_lock(n_ptr);
1694
1695 addr_string_fill(addr_string, n_ptr->addr);
1696 tipc_printf(TIPC_OUTPUT, "Multicast link info for %s\n", addr_string);
1697 tipc_printf(TIPC_OUTPUT, "Supported: %d, ", n_ptr->bclink.supported);
1698 tipc_printf(TIPC_OUTPUT, "Acked: %u\n", n_ptr->bclink.acked);
1699 tipc_printf(TIPC_OUTPUT, "Last in: %u, ", n_ptr->bclink.last_in);
1700 tipc_printf(TIPC_OUTPUT, "Gap after: %u, ", n_ptr->bclink.gap_after);
1701 tipc_printf(TIPC_OUTPUT, "Gap to: %u\n", n_ptr->bclink.gap_to);
1702 tipc_printf(TIPC_OUTPUT, "Nack sync: %u\n\n", n_ptr->bclink.nack_sync);
1703
1704 tipc_k_signal((Handler)link_reset_all, (unsigned long)n_ptr->addr);
1705
1706 tipc_node_unlock(n_ptr);
1707
1708 l_ptr->stale_count = 0;
1709 }
1710 }
1711
1712 void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
1713 u32 retransmits)
1714 {
1715 struct tipc_msg *msg;
1716
1717 if (!buf)
1718 return;
1719
1720 msg = buf_msg(buf);
1721
1722 dbg("Retransmitting %u in link %x\n", retransmits, l_ptr);
1723
1724 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
1725 if (!skb_cloned(buf)) {
1726 msg_dbg(msg, ">NO_RETR->BCONG>");
1727 dbg_print_link(l_ptr, " ");
1728 l_ptr->retransm_queue_head = msg_seqno(msg);
1729 l_ptr->retransm_queue_size = retransmits;
1730 return;
1731 } else {
1732 /* Don't retransmit if driver already has the buffer */
1733 }
1734 } else {
1735 /* Detect repeated retransmit failures on uncongested bearer */
1736
1737 if (l_ptr->last_retransmitted == msg_seqno(msg)) {
1738 if (++l_ptr->stale_count > 100) {
1739 link_retransmit_failure(l_ptr, buf);
1740 return;
1741 }
1742 } else {
1743 l_ptr->last_retransmitted = msg_seqno(msg);
1744 l_ptr->stale_count = 1;
1745 }
1746 }
1747
1748 while (retransmits && (buf != l_ptr->next_out) && buf && !skb_cloned(buf)) {
1749 msg = buf_msg(buf);
1750 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1751 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1752 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1753 msg_dbg(buf_msg(buf), ">RETR>");
1754 buf = buf->next;
1755 retransmits--;
1756 l_ptr->stats.retransmitted++;
1757 } else {
1758 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1759 l_ptr->stats.bearer_congs++;
1760 l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
1761 l_ptr->retransm_queue_size = retransmits;
1762 return;
1763 }
1764 }
1765
1766 l_ptr->retransm_queue_head = l_ptr->retransm_queue_size = 0;
1767 }
1768
1769 /**
1770 * link_insert_deferred_queue - insert deferred messages back into receive chain
1771 */
1772
1773 static struct sk_buff *link_insert_deferred_queue(struct link *l_ptr,
1774 struct sk_buff *buf)
1775 {
1776 u32 seq_no;
1777
1778 if (l_ptr->oldest_deferred_in == NULL)
1779 return buf;
1780
1781 seq_no = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1782 if (seq_no == mod(l_ptr->next_in_no)) {
1783 l_ptr->newest_deferred_in->next = buf;
1784 buf = l_ptr->oldest_deferred_in;
1785 l_ptr->oldest_deferred_in = NULL;
1786 l_ptr->deferred_inqueue_sz = 0;
1787 }
1788 return buf;
1789 }
1790
1791 /**
1792 * link_recv_buf_validate - validate basic format of received message
1793 *
1794 * This routine ensures a TIPC message has an acceptable header, and at least
1795 * as much data as the header indicates it should. The routine also ensures
1796 * that the entire message header is stored in the main fragment of the message
1797 * buffer, to simplify future access to message header fields.
1798 *
1799 * Note: Having extra info present in the message header or data areas is OK.
1800 * TIPC will ignore the excess, under the assumption that it is optional info
1801 * introduced by a later release of the protocol.
1802 */
1803
1804 static int link_recv_buf_validate(struct sk_buff *buf)
1805 {
1806 static u32 min_data_hdr_size[8] = {
1807 SHORT_H_SIZE, MCAST_H_SIZE, LONG_H_SIZE, DIR_MSG_H_SIZE,
1808 MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE
1809 };
1810
1811 struct tipc_msg *msg;
1812 u32 tipc_hdr[2];
1813 u32 size;
1814 u32 hdr_size;
1815 u32 min_hdr_size;
1816
1817 if (unlikely(buf->len < MIN_H_SIZE))
1818 return 0;
1819
1820 msg = skb_header_pointer(buf, 0, sizeof(tipc_hdr), tipc_hdr);
1821 if (msg == NULL)
1822 return 0;
1823
1824 if (unlikely(msg_version(msg) != TIPC_VERSION))
1825 return 0;
1826
1827 size = msg_size(msg);
1828 hdr_size = msg_hdr_sz(msg);
1829 min_hdr_size = msg_isdata(msg) ?
1830 min_data_hdr_size[msg_type(msg)] : INT_H_SIZE;
1831
1832 if (unlikely((hdr_size < min_hdr_size) ||
1833 (size < hdr_size) ||
1834 (buf->len < size) ||
1835 (size - hdr_size > TIPC_MAX_USER_MSG_SIZE)))
1836 return 0;
1837
1838 return pskb_may_pull(buf, hdr_size);
1839 }
1840
1841 void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *tb_ptr)
1842 {
1843 read_lock_bh(&tipc_net_lock);
1844 while (head) {
1845 struct bearer *b_ptr = (struct bearer *)tb_ptr;
1846 struct tipc_node *n_ptr;
1847 struct link *l_ptr;
1848 struct sk_buff *crs;
1849 struct sk_buff *buf = head;
1850 struct tipc_msg *msg;
1851 u32 seq_no;
1852 u32 ackd;
1853 u32 released = 0;
1854 int type;
1855
1856 head = head->next;
1857
1858 /* Ensure message is well-formed */
1859
1860 if (unlikely(!link_recv_buf_validate(buf)))
1861 goto cont;
1862
1863 /* Ensure message data is a single contiguous unit */
1864
1865 if (unlikely(buf_linearize(buf))) {
1866 goto cont;
1867 }
1868
1869 /* Handle arrival of a non-unicast link message */
1870
1871 msg = buf_msg(buf);
1872
1873 if (unlikely(msg_non_seq(msg))) {
1874 if (msg_user(msg) == LINK_CONFIG)
1875 tipc_disc_recv_msg(buf, b_ptr);
1876 else
1877 tipc_bclink_recv_pkt(buf);
1878 continue;
1879 }
1880
1881 if (unlikely(!msg_short(msg) &&
1882 (msg_destnode(msg) != tipc_own_addr)))
1883 goto cont;
1884
1885 /* Locate unicast link endpoint that should handle message */
1886
1887 n_ptr = tipc_node_find(msg_prevnode(msg));
1888 if (unlikely(!n_ptr))
1889 goto cont;
1890 tipc_node_lock(n_ptr);
1891
1892 l_ptr = n_ptr->links[b_ptr->identity];
1893 if (unlikely(!l_ptr)) {
1894 tipc_node_unlock(n_ptr);
1895 goto cont;
1896 }
1897
1898 /* Validate message sequence number info */
1899
1900 seq_no = msg_seqno(msg);
1901 ackd = msg_ack(msg);
1902
1903 /* Release acked messages */
1904
1905 if (less(n_ptr->bclink.acked, msg_bcast_ack(msg))) {
1906 if (tipc_node_is_up(n_ptr) && n_ptr->bclink.supported)
1907 tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
1908 }
1909
1910 crs = l_ptr->first_out;
1911 while ((crs != l_ptr->next_out) &&
1912 less_eq(msg_seqno(buf_msg(crs)), ackd)) {
1913 struct sk_buff *next = crs->next;
1914
1915 buf_discard(crs);
1916 crs = next;
1917 released++;
1918 }
1919 if (released) {
1920 l_ptr->first_out = crs;
1921 l_ptr->out_queue_size -= released;
1922 }
1923
1924 /* Try sending any messages link endpoint has pending */
1925
1926 if (unlikely(l_ptr->next_out))
1927 tipc_link_push_queue(l_ptr);
1928 if (unlikely(!list_empty(&l_ptr->waiting_ports)))
1929 tipc_link_wakeup_ports(l_ptr, 0);
1930 if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
1931 l_ptr->stats.sent_acks++;
1932 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
1933 }
1934
1935 /* Now (finally!) process the incoming message */
1936
1937 protocol_check:
1938 if (likely(link_working_working(l_ptr))) {
1939 if (likely(seq_no == mod(l_ptr->next_in_no))) {
1940 l_ptr->next_in_no++;
1941 if (unlikely(l_ptr->oldest_deferred_in))
1942 head = link_insert_deferred_queue(l_ptr,
1943 head);
1944 if (likely(msg_is_dest(msg, tipc_own_addr))) {
1945 deliver:
1946 if (likely(msg_isdata(msg))) {
1947 tipc_node_unlock(n_ptr);
1948 tipc_port_recv_msg(buf);
1949 continue;
1950 }
1951 switch (msg_user(msg)) {
1952 case MSG_BUNDLER:
1953 l_ptr->stats.recv_bundles++;
1954 l_ptr->stats.recv_bundled +=
1955 msg_msgcnt(msg);
1956 tipc_node_unlock(n_ptr);
1957 tipc_link_recv_bundle(buf);
1958 continue;
1959 case ROUTE_DISTRIBUTOR:
1960 tipc_node_unlock(n_ptr);
1961 tipc_cltr_recv_routing_table(buf);
1962 continue;
1963 case NAME_DISTRIBUTOR:
1964 tipc_node_unlock(n_ptr);
1965 tipc_named_recv(buf);
1966 continue;
1967 case CONN_MANAGER:
1968 tipc_node_unlock(n_ptr);
1969 tipc_port_recv_proto_msg(buf);
1970 continue;
1971 case MSG_FRAGMENTER:
1972 l_ptr->stats.recv_fragments++;
1973 if (tipc_link_recv_fragment(&l_ptr->defragm_buf,
1974 &buf, &msg)) {
1975 l_ptr->stats.recv_fragmented++;
1976 goto deliver;
1977 }
1978 break;
1979 case CHANGEOVER_PROTOCOL:
1980 type = msg_type(msg);
1981 if (link_recv_changeover_msg(&l_ptr, &buf)) {
1982 msg = buf_msg(buf);
1983 seq_no = msg_seqno(msg);
1984 if (type == ORIGINAL_MSG)
1985 goto deliver;
1986 goto protocol_check;
1987 }
1988 break;
1989 }
1990 }
1991 tipc_node_unlock(n_ptr);
1992 tipc_net_route_msg(buf);
1993 continue;
1994 }
1995 link_handle_out_of_seq_msg(l_ptr, buf);
1996 head = link_insert_deferred_queue(l_ptr, head);
1997 tipc_node_unlock(n_ptr);
1998 continue;
1999 }
2000
2001 if (msg_user(msg) == LINK_PROTOCOL) {
2002 link_recv_proto_msg(l_ptr, buf);
2003 head = link_insert_deferred_queue(l_ptr, head);
2004 tipc_node_unlock(n_ptr);
2005 continue;
2006 }
2007 msg_dbg(msg,"NSEQ<REC<");
2008 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
2009
2010 if (link_working_working(l_ptr)) {
2011 /* Re-insert in front of queue */
2012 msg_dbg(msg,"RECV-REINS:");
2013 buf->next = head;
2014 head = buf;
2015 tipc_node_unlock(n_ptr);
2016 continue;
2017 }
2018 tipc_node_unlock(n_ptr);
2019 cont:
2020 buf_discard(buf);
2021 }
2022 read_unlock_bh(&tipc_net_lock);
2023 }
2024
2025 /*
2026 * link_defer_buf(): Sort a received out-of-sequence packet
2027 * into the deferred reception queue.
2028 * Returns the increase of the queue length,i.e. 0 or 1
2029 */
2030
2031 u32 tipc_link_defer_pkt(struct sk_buff **head,
2032 struct sk_buff **tail,
2033 struct sk_buff *buf)
2034 {
2035 struct sk_buff *prev = NULL;
2036 struct sk_buff *crs = *head;
2037 u32 seq_no = msg_seqno(buf_msg(buf));
2038
2039 buf->next = NULL;
2040
2041 /* Empty queue ? */
2042 if (*head == NULL) {
2043 *head = *tail = buf;
2044 return 1;
2045 }
2046
2047 /* Last ? */
2048 if (less(msg_seqno(buf_msg(*tail)), seq_no)) {
2049 (*tail)->next = buf;
2050 *tail = buf;
2051 return 1;
2052 }
2053
2054 /* Scan through queue and sort it in */
2055 do {
2056 struct tipc_msg *msg = buf_msg(crs);
2057
2058 if (less(seq_no, msg_seqno(msg))) {
2059 buf->next = crs;
2060 if (prev)
2061 prev->next = buf;
2062 else
2063 *head = buf;
2064 return 1;
2065 }
2066 if (seq_no == msg_seqno(msg)) {
2067 break;
2068 }
2069 prev = crs;
2070 crs = crs->next;
2071 }
2072 while (crs);
2073
2074 /* Message is a duplicate of an existing message */
2075
2076 buf_discard(buf);
2077 return 0;
2078 }
2079
2080 /**
2081 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
2082 */
2083
2084 static void link_handle_out_of_seq_msg(struct link *l_ptr,
2085 struct sk_buff *buf)
2086 {
2087 u32 seq_no = msg_seqno(buf_msg(buf));
2088
2089 if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
2090 link_recv_proto_msg(l_ptr, buf);
2091 return;
2092 }
2093
2094 dbg("rx OOS msg: seq_no %u, expecting %u (%u)\n",
2095 seq_no, mod(l_ptr->next_in_no), l_ptr->next_in_no);
2096
2097 /* Record OOS packet arrival (force mismatch on next timeout) */
2098
2099 l_ptr->checkpoint--;
2100
2101 /*
2102 * Discard packet if a duplicate; otherwise add it to deferred queue
2103 * and notify peer of gap as per protocol specification
2104 */
2105
2106 if (less(seq_no, mod(l_ptr->next_in_no))) {
2107 l_ptr->stats.duplicates++;
2108 buf_discard(buf);
2109 return;
2110 }
2111
2112 if (tipc_link_defer_pkt(&l_ptr->oldest_deferred_in,
2113 &l_ptr->newest_deferred_in, buf)) {
2114 l_ptr->deferred_inqueue_sz++;
2115 l_ptr->stats.deferred_recv++;
2116 if ((l_ptr->deferred_inqueue_sz % 16) == 1)
2117 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
2118 } else
2119 l_ptr->stats.duplicates++;
2120 }
2121
2122 /*
2123 * Send protocol message to the other endpoint.
2124 */
2125 void tipc_link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int probe_msg,
2126 u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
2127 {
2128 struct sk_buff *buf = NULL;
2129 struct tipc_msg *msg = l_ptr->pmsg;
2130 u32 msg_size = sizeof(l_ptr->proto_msg);
2131
2132 if (link_blocked(l_ptr))
2133 return;
2134 msg_set_type(msg, msg_typ);
2135 msg_set_net_plane(msg, l_ptr->b_ptr->net_plane);
2136 msg_set_bcast_ack(msg, mod(l_ptr->owner->bclink.last_in));
2137 msg_set_last_bcast(msg, tipc_bclink_get_last_sent());
2138
2139 if (msg_typ == STATE_MSG) {
2140 u32 next_sent = mod(l_ptr->next_out_no);
2141
2142 if (!tipc_link_is_up(l_ptr))
2143 return;
2144 if (l_ptr->next_out)
2145 next_sent = msg_seqno(buf_msg(l_ptr->next_out));
2146 msg_set_next_sent(msg, next_sent);
2147 if (l_ptr->oldest_deferred_in) {
2148 u32 rec = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
2149 gap = mod(rec - mod(l_ptr->next_in_no));
2150 }
2151 msg_set_seq_gap(msg, gap);
2152 if (gap)
2153 l_ptr->stats.sent_nacks++;
2154 msg_set_link_tolerance(msg, tolerance);
2155 msg_set_linkprio(msg, priority);
2156 msg_set_max_pkt(msg, ack_mtu);
2157 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
2158 msg_set_probe(msg, probe_msg != 0);
2159 if (probe_msg) {
2160 u32 mtu = l_ptr->max_pkt;
2161
2162 if ((mtu < l_ptr->max_pkt_target) &&
2163 link_working_working(l_ptr) &&
2164 l_ptr->fsm_msg_cnt) {
2165 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
2166 if (l_ptr->max_pkt_probes == 10) {
2167 l_ptr->max_pkt_target = (msg_size - 4);
2168 l_ptr->max_pkt_probes = 0;
2169 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
2170 }
2171 l_ptr->max_pkt_probes++;
2172 }
2173
2174 l_ptr->stats.sent_probes++;
2175 }
2176 l_ptr->stats.sent_states++;
2177 } else { /* RESET_MSG or ACTIVATE_MSG */
2178 msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
2179 msg_set_seq_gap(msg, 0);
2180 msg_set_next_sent(msg, 1);
2181 msg_set_link_tolerance(msg, l_ptr->tolerance);
2182 msg_set_linkprio(msg, l_ptr->priority);
2183 msg_set_max_pkt(msg, l_ptr->max_pkt_target);
2184 }
2185
2186 if (tipc_node_has_redundant_links(l_ptr->owner)) {
2187 msg_set_redundant_link(msg);
2188 } else {
2189 msg_clear_redundant_link(msg);
2190 }
2191 msg_set_linkprio(msg, l_ptr->priority);
2192
2193 /* Ensure sequence number will not fit : */
2194
2195 msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
2196
2197 /* Congestion? */
2198
2199 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
2200 if (!l_ptr->proto_msg_queue) {
2201 l_ptr->proto_msg_queue =
2202 buf_acquire(sizeof(l_ptr->proto_msg));
2203 }
2204 buf = l_ptr->proto_msg_queue;
2205 if (!buf)
2206 return;
2207 skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
2208 return;
2209 }
2210 msg_set_timestamp(msg, jiffies_to_msecs(jiffies));
2211
2212 /* Message can be sent */
2213
2214 msg_dbg(msg, ">>");
2215
2216 buf = buf_acquire(msg_size);
2217 if (!buf)
2218 return;
2219
2220 skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
2221 msg_set_size(buf_msg(buf), msg_size);
2222
2223 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
2224 l_ptr->unacked_window = 0;
2225 buf_discard(buf);
2226 return;
2227 }
2228
2229 /* New congestion */
2230 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
2231 l_ptr->proto_msg_queue = buf;
2232 l_ptr->stats.bearer_congs++;
2233 }
2234
2235 /*
2236 * Receive protocol message :
2237 * Note that network plane id propagates through the network, and may
2238 * change at any time. The node with lowest address rules
2239 */
2240
2241 static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf)
2242 {
2243 u32 rec_gap = 0;
2244 u32 max_pkt_info;
2245 u32 max_pkt_ack;
2246 u32 msg_tol;
2247 struct tipc_msg *msg = buf_msg(buf);
2248
2249 dbg("AT(%u):", jiffies_to_msecs(jiffies));
2250 msg_dbg(msg, "<<");
2251 if (link_blocked(l_ptr))
2252 goto exit;
2253
2254 /* record unnumbered packet arrival (force mismatch on next timeout) */
2255
2256 l_ptr->checkpoint--;
2257
2258 if (l_ptr->b_ptr->net_plane != msg_net_plane(msg))
2259 if (tipc_own_addr > msg_prevnode(msg))
2260 l_ptr->b_ptr->net_plane = msg_net_plane(msg);
2261
2262 l_ptr->owner->permit_changeover = msg_redundant_link(msg);
2263
2264 switch (msg_type(msg)) {
2265
2266 case RESET_MSG:
2267 if (!link_working_unknown(l_ptr) &&
2268 (l_ptr->peer_session != INVALID_SESSION)) {
2269 if (msg_session(msg) == l_ptr->peer_session) {
2270 dbg("Duplicate RESET: %u<->%u\n",
2271 msg_session(msg), l_ptr->peer_session);
2272 break; /* duplicate: ignore */
2273 }
2274 }
2275 /* fall thru' */
2276 case ACTIVATE_MSG:
2277 /* Update link settings according other endpoint's values */
2278
2279 strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
2280
2281 if ((msg_tol = msg_link_tolerance(msg)) &&
2282 (msg_tol > l_ptr->tolerance))
2283 link_set_supervision_props(l_ptr, msg_tol);
2284
2285 if (msg_linkprio(msg) > l_ptr->priority)
2286 l_ptr->priority = msg_linkprio(msg);
2287
2288 max_pkt_info = msg_max_pkt(msg);
2289 if (max_pkt_info) {
2290 if (max_pkt_info < l_ptr->max_pkt_target)
2291 l_ptr->max_pkt_target = max_pkt_info;
2292 if (l_ptr->max_pkt > l_ptr->max_pkt_target)
2293 l_ptr->max_pkt = l_ptr->max_pkt_target;
2294 } else {
2295 l_ptr->max_pkt = l_ptr->max_pkt_target;
2296 }
2297 l_ptr->owner->bclink.supported = (max_pkt_info != 0);
2298
2299 link_state_event(l_ptr, msg_type(msg));
2300
2301 l_ptr->peer_session = msg_session(msg);
2302 l_ptr->peer_bearer_id = msg_bearer_id(msg);
2303
2304 /* Synchronize broadcast sequence numbers */
2305 if (!tipc_node_has_redundant_links(l_ptr->owner)) {
2306 l_ptr->owner->bclink.last_in = mod(msg_last_bcast(msg));
2307 }
2308 break;
2309 case STATE_MSG:
2310
2311 if ((msg_tol = msg_link_tolerance(msg)))
2312 link_set_supervision_props(l_ptr, msg_tol);
2313
2314 if (msg_linkprio(msg) &&
2315 (msg_linkprio(msg) != l_ptr->priority)) {
2316 warn("Resetting link <%s>, priority change %u->%u\n",
2317 l_ptr->name, l_ptr->priority, msg_linkprio(msg));
2318 l_ptr->priority = msg_linkprio(msg);
2319 tipc_link_reset(l_ptr); /* Enforce change to take effect */
2320 break;
2321 }
2322 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
2323 l_ptr->stats.recv_states++;
2324 if (link_reset_unknown(l_ptr))
2325 break;
2326
2327 if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
2328 rec_gap = mod(msg_next_sent(msg) -
2329 mod(l_ptr->next_in_no));
2330 }
2331
2332 max_pkt_ack = msg_max_pkt(msg);
2333 if (max_pkt_ack > l_ptr->max_pkt) {
2334 dbg("Link <%s> updated MTU %u -> %u\n",
2335 l_ptr->name, l_ptr->max_pkt, max_pkt_ack);
2336 l_ptr->max_pkt = max_pkt_ack;
2337 l_ptr->max_pkt_probes = 0;
2338 }
2339
2340 max_pkt_ack = 0;
2341 if (msg_probe(msg)) {
2342 l_ptr->stats.recv_probes++;
2343 if (msg_size(msg) > sizeof(l_ptr->proto_msg)) {
2344 max_pkt_ack = msg_size(msg);
2345 }
2346 }
2347
2348 /* Protocol message before retransmits, reduce loss risk */
2349
2350 tipc_bclink_check_gap(l_ptr->owner, msg_last_bcast(msg));
2351
2352 if (rec_gap || (msg_probe(msg))) {
2353 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2354 0, rec_gap, 0, 0, max_pkt_ack);
2355 }
2356 if (msg_seq_gap(msg)) {
2357 msg_dbg(msg, "With Gap:");
2358 l_ptr->stats.recv_nacks++;
2359 tipc_link_retransmit(l_ptr, l_ptr->first_out,
2360 msg_seq_gap(msg));
2361 }
2362 break;
2363 default:
2364 msg_dbg(buf_msg(buf), "<DISCARDING UNKNOWN<");
2365 }
2366 exit:
2367 buf_discard(buf);
2368 }
2369
2370
2371 /*
2372 * tipc_link_tunnel(): Send one message via a link belonging to
2373 * another bearer. Owner node is locked.
2374 */
2375 void tipc_link_tunnel(struct link *l_ptr,
2376 struct tipc_msg *tunnel_hdr,
2377 struct tipc_msg *msg,
2378 u32 selector)
2379 {
2380 struct link *tunnel;
2381 struct sk_buff *buf;
2382 u32 length = msg_size(msg);
2383
2384 tunnel = l_ptr->owner->active_links[selector & 1];
2385 if (!tipc_link_is_up(tunnel)) {
2386 warn("Link changeover error, "
2387 "tunnel link no longer available\n");
2388 return;
2389 }
2390 msg_set_size(tunnel_hdr, length + INT_H_SIZE);
2391 buf = buf_acquire(length + INT_H_SIZE);
2392 if (!buf) {
2393 warn("Link changeover error, "
2394 "unable to send tunnel msg\n");
2395 return;
2396 }
2397 skb_copy_to_linear_data(buf, tunnel_hdr, INT_H_SIZE);
2398 skb_copy_to_linear_data_offset(buf, INT_H_SIZE, msg, length);
2399 dbg("%c->%c:", l_ptr->b_ptr->net_plane, tunnel->b_ptr->net_plane);
2400 msg_dbg(buf_msg(buf), ">SEND>");
2401 tipc_link_send_buf(tunnel, buf);
2402 }
2403
2404
2405
2406 /*
2407 * changeover(): Send whole message queue via the remaining link
2408 * Owner node is locked.
2409 */
2410
2411 void tipc_link_changeover(struct link *l_ptr)
2412 {
2413 u32 msgcount = l_ptr->out_queue_size;
2414 struct sk_buff *crs = l_ptr->first_out;
2415 struct link *tunnel = l_ptr->owner->active_links[0];
2416 struct tipc_msg tunnel_hdr;
2417 int split_bundles;
2418
2419 if (!tunnel)
2420 return;
2421
2422 if (!l_ptr->owner->permit_changeover) {
2423 warn("Link changeover error, "
2424 "peer did not permit changeover\n");
2425 return;
2426 }
2427
2428 msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2429 ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr);
2430 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2431 msg_set_msgcnt(&tunnel_hdr, msgcount);
2432 dbg("Link changeover requires %u tunnel messages\n", msgcount);
2433
2434 if (!l_ptr->first_out) {
2435 struct sk_buff *buf;
2436
2437 buf = buf_acquire(INT_H_SIZE);
2438 if (buf) {
2439 skb_copy_to_linear_data(buf, &tunnel_hdr, INT_H_SIZE);
2440 msg_set_size(&tunnel_hdr, INT_H_SIZE);
2441 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2442 tunnel->b_ptr->net_plane);
2443 msg_dbg(&tunnel_hdr, "EMPTY>SEND>");
2444 tipc_link_send_buf(tunnel, buf);
2445 } else {
2446 warn("Link changeover error, "
2447 "unable to send changeover msg\n");
2448 }
2449 return;
2450 }
2451
2452 split_bundles = (l_ptr->owner->active_links[0] !=
2453 l_ptr->owner->active_links[1]);
2454
2455 while (crs) {
2456 struct tipc_msg *msg = buf_msg(crs);
2457
2458 if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
2459 struct tipc_msg *m = msg_get_wrapped(msg);
2460 unchar* pos = (unchar*)m;
2461
2462 msgcount = msg_msgcnt(msg);
2463 while (msgcount--) {
2464 msg_set_seqno(m,msg_seqno(msg));
2465 tipc_link_tunnel(l_ptr, &tunnel_hdr, m,
2466 msg_link_selector(m));
2467 pos += align(msg_size(m));
2468 m = (struct tipc_msg *)pos;
2469 }
2470 } else {
2471 tipc_link_tunnel(l_ptr, &tunnel_hdr, msg,
2472 msg_link_selector(msg));
2473 }
2474 crs = crs->next;
2475 }
2476 }
2477
2478 void tipc_link_send_duplicate(struct link *l_ptr, struct link *tunnel)
2479 {
2480 struct sk_buff *iter;
2481 struct tipc_msg tunnel_hdr;
2482
2483 msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2484 DUPLICATE_MSG, INT_H_SIZE, l_ptr->addr);
2485 msg_set_msgcnt(&tunnel_hdr, l_ptr->out_queue_size);
2486 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2487 iter = l_ptr->first_out;
2488 while (iter) {
2489 struct sk_buff *outbuf;
2490 struct tipc_msg *msg = buf_msg(iter);
2491 u32 length = msg_size(msg);
2492
2493 if (msg_user(msg) == MSG_BUNDLER)
2494 msg_set_type(msg, CLOSED_MSG);
2495 msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
2496 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
2497 msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
2498 outbuf = buf_acquire(length + INT_H_SIZE);
2499 if (outbuf == NULL) {
2500 warn("Link changeover error, "
2501 "unable to send duplicate msg\n");
2502 return;
2503 }
2504 skb_copy_to_linear_data(outbuf, &tunnel_hdr, INT_H_SIZE);
2505 skb_copy_to_linear_data_offset(outbuf, INT_H_SIZE, iter->data,
2506 length);
2507 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2508 tunnel->b_ptr->net_plane);
2509 msg_dbg(buf_msg(outbuf), ">SEND>");
2510 tipc_link_send_buf(tunnel, outbuf);
2511 if (!tipc_link_is_up(l_ptr))
2512 return;
2513 iter = iter->next;
2514 }
2515 }
2516
2517
2518
2519 /**
2520 * buf_extract - extracts embedded TIPC message from another message
2521 * @skb: encapsulating message buffer
2522 * @from_pos: offset to extract from
2523 *
2524 * Returns a new message buffer containing an embedded message. The
2525 * encapsulating message itself is left unchanged.
2526 */
2527
2528 static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
2529 {
2530 struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
2531 u32 size = msg_size(msg);
2532 struct sk_buff *eb;
2533
2534 eb = buf_acquire(size);
2535 if (eb)
2536 skb_copy_to_linear_data(eb, msg, size);
2537 return eb;
2538 }
2539
2540 /*
2541 * link_recv_changeover_msg(): Receive tunneled packet sent
2542 * via other link. Node is locked. Return extracted buffer.
2543 */
2544
2545 static int link_recv_changeover_msg(struct link **l_ptr,
2546 struct sk_buff **buf)
2547 {
2548 struct sk_buff *tunnel_buf = *buf;
2549 struct link *dest_link;
2550 struct tipc_msg *msg;
2551 struct tipc_msg *tunnel_msg = buf_msg(tunnel_buf);
2552 u32 msg_typ = msg_type(tunnel_msg);
2553 u32 msg_count = msg_msgcnt(tunnel_msg);
2554
2555 dest_link = (*l_ptr)->owner->links[msg_bearer_id(tunnel_msg)];
2556 if (!dest_link) {
2557 msg_dbg(tunnel_msg, "NOLINK/<REC<");
2558 goto exit;
2559 }
2560 if (dest_link == *l_ptr) {
2561 err("Unexpected changeover message on link <%s>\n",
2562 (*l_ptr)->name);
2563 goto exit;
2564 }
2565 dbg("%c<-%c:", dest_link->b_ptr->net_plane,
2566 (*l_ptr)->b_ptr->net_plane);
2567 *l_ptr = dest_link;
2568 msg = msg_get_wrapped(tunnel_msg);
2569
2570 if (msg_typ == DUPLICATE_MSG) {
2571 if (less(msg_seqno(msg), mod(dest_link->next_in_no))) {
2572 msg_dbg(tunnel_msg, "DROP/<REC<");
2573 goto exit;
2574 }
2575 *buf = buf_extract(tunnel_buf,INT_H_SIZE);
2576 if (*buf == NULL) {
2577 warn("Link changeover error, duplicate msg dropped\n");
2578 goto exit;
2579 }
2580 msg_dbg(tunnel_msg, "TNL<REC<");
2581 buf_discard(tunnel_buf);
2582 return 1;
2583 }
2584
2585 /* First original message ?: */
2586
2587 if (tipc_link_is_up(dest_link)) {
2588 msg_dbg(tunnel_msg, "UP/FIRST/<REC<");
2589 info("Resetting link <%s>, changeover initiated by peer\n",
2590 dest_link->name);
2591 tipc_link_reset(dest_link);
2592 dest_link->exp_msg_count = msg_count;
2593 dbg("Expecting %u tunnelled messages\n", msg_count);
2594 if (!msg_count)
2595 goto exit;
2596 } else if (dest_link->exp_msg_count == START_CHANGEOVER) {
2597 msg_dbg(tunnel_msg, "BLK/FIRST/<REC<");
2598 dest_link->exp_msg_count = msg_count;
2599 dbg("Expecting %u tunnelled messages\n", msg_count);
2600 if (!msg_count)
2601 goto exit;
2602 }
2603
2604 /* Receive original message */
2605
2606 if (dest_link->exp_msg_count == 0) {
2607 warn("Link switchover error, "
2608 "got too many tunnelled messages\n");
2609 msg_dbg(tunnel_msg, "OVERDUE/DROP/<REC<");
2610 dbg_print_link(dest_link, "LINK:");
2611 goto exit;
2612 }
2613 dest_link->exp_msg_count--;
2614 if (less(msg_seqno(msg), dest_link->reset_checkpoint)) {
2615 msg_dbg(tunnel_msg, "DROP/DUPL/<REC<");
2616 goto exit;
2617 } else {
2618 *buf = buf_extract(tunnel_buf, INT_H_SIZE);
2619 if (*buf != NULL) {
2620 msg_dbg(tunnel_msg, "TNL<REC<");
2621 buf_discard(tunnel_buf);
2622 return 1;
2623 } else {
2624 warn("Link changeover error, original msg dropped\n");
2625 }
2626 }
2627 exit:
2628 *buf = NULL;
2629 buf_discard(tunnel_buf);
2630 return 0;
2631 }
2632
2633 /*
2634 * Bundler functionality:
2635 */
2636 void tipc_link_recv_bundle(struct sk_buff *buf)
2637 {
2638 u32 msgcount = msg_msgcnt(buf_msg(buf));
2639 u32 pos = INT_H_SIZE;
2640 struct sk_buff *obuf;
2641
2642 msg_dbg(buf_msg(buf), "<BNDL<: ");
2643 while (msgcount--) {
2644 obuf = buf_extract(buf, pos);
2645 if (obuf == NULL) {
2646 warn("Link unable to unbundle message(s)\n");
2647 break;
2648 }
2649 pos += align(msg_size(buf_msg(obuf)));
2650 msg_dbg(buf_msg(obuf), " /");
2651 tipc_net_route_msg(obuf);
2652 }
2653 buf_discard(buf);
2654 }
2655
2656 /*
2657 * Fragmentation/defragmentation:
2658 */
2659
2660
2661 /*
2662 * tipc_link_send_long_buf: Entry for buffers needing fragmentation.
2663 * The buffer is complete, inclusive total message length.
2664 * Returns user data length.
2665 */
2666 int tipc_link_send_long_buf(struct link *l_ptr, struct sk_buff *buf)
2667 {
2668 struct tipc_msg *inmsg = buf_msg(buf);
2669 struct tipc_msg fragm_hdr;
2670 u32 insize = msg_size(inmsg);
2671 u32 dsz = msg_data_sz(inmsg);
2672 unchar *crs = buf->data;
2673 u32 rest = insize;
2674 u32 pack_sz = link_max_pkt(l_ptr);
2675 u32 fragm_sz = pack_sz - INT_H_SIZE;
2676 u32 fragm_no = 1;
2677 u32 destaddr;
2678
2679 if (msg_short(inmsg))
2680 destaddr = l_ptr->addr;
2681 else
2682 destaddr = msg_destnode(inmsg);
2683
2684 if (msg_routed(inmsg))
2685 msg_set_prevnode(inmsg, tipc_own_addr);
2686
2687 /* Prepare reusable fragment header: */
2688
2689 msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
2690 INT_H_SIZE, destaddr);
2691 msg_set_link_selector(&fragm_hdr, msg_link_selector(inmsg));
2692 msg_set_long_msgno(&fragm_hdr, mod(l_ptr->long_msg_seq_no++));
2693 msg_set_fragm_no(&fragm_hdr, fragm_no);
2694 l_ptr->stats.sent_fragmented++;
2695
2696 /* Chop up message: */
2697
2698 while (rest > 0) {
2699 struct sk_buff *fragm;
2700
2701 if (rest <= fragm_sz) {
2702 fragm_sz = rest;
2703 msg_set_type(&fragm_hdr, LAST_FRAGMENT);
2704 }
2705 fragm = buf_acquire(fragm_sz + INT_H_SIZE);
2706 if (fragm == NULL) {
2707 warn("Link unable to fragment message\n");
2708 dsz = -ENOMEM;
2709 goto exit;
2710 }
2711 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
2712 skb_copy_to_linear_data(fragm, &fragm_hdr, INT_H_SIZE);
2713 skb_copy_to_linear_data_offset(fragm, INT_H_SIZE, crs,
2714 fragm_sz);
2715 /* Send queued messages first, if any: */
2716
2717 l_ptr->stats.sent_fragments++;
2718 tipc_link_send_buf(l_ptr, fragm);
2719 if (!tipc_link_is_up(l_ptr))
2720 return dsz;
2721 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
2722 rest -= fragm_sz;
2723 crs += fragm_sz;
2724 msg_set_type(&fragm_hdr, FRAGMENT);
2725 }
2726 exit:
2727 buf_discard(buf);
2728 return dsz;
2729 }
2730
2731 /*
2732 * A pending message being re-assembled must store certain values
2733 * to handle subsequent fragments correctly. The following functions
2734 * help storing these values in unused, available fields in the
2735 * pending message. This makes dynamic memory allocation unecessary.
2736 */
2737
2738 static void set_long_msg_seqno(struct sk_buff *buf, u32 seqno)
2739 {
2740 msg_set_seqno(buf_msg(buf), seqno);
2741 }
2742
2743 static u32 get_fragm_size(struct sk_buff *buf)
2744 {
2745 return msg_ack(buf_msg(buf));
2746 }
2747
2748 static void set_fragm_size(struct sk_buff *buf, u32 sz)
2749 {
2750 msg_set_ack(buf_msg(buf), sz);
2751 }
2752
2753 static u32 get_expected_frags(struct sk_buff *buf)
2754 {
2755 return msg_bcast_ack(buf_msg(buf));
2756 }
2757
2758 static void set_expected_frags(struct sk_buff *buf, u32 exp)
2759 {
2760 msg_set_bcast_ack(buf_msg(buf), exp);
2761 }
2762
2763 static u32 get_timer_cnt(struct sk_buff *buf)
2764 {
2765 return msg_reroute_cnt(buf_msg(buf));
2766 }
2767
2768 static void incr_timer_cnt(struct sk_buff *buf)
2769 {
2770 msg_incr_reroute_cnt(buf_msg(buf));
2771 }
2772
2773 /*
2774 * tipc_link_recv_fragment(): Called with node lock on. Returns
2775 * the reassembled buffer if message is complete.
2776 */
2777 int tipc_link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb,
2778 struct tipc_msg **m)
2779 {
2780 struct sk_buff *prev = NULL;
2781 struct sk_buff *fbuf = *fb;
2782 struct tipc_msg *fragm = buf_msg(fbuf);
2783 struct sk_buff *pbuf = *pending;
2784 u32 long_msg_seq_no = msg_long_msgno(fragm);
2785
2786 *fb = NULL;
2787 msg_dbg(fragm,"FRG<REC<");
2788
2789 /* Is there an incomplete message waiting for this fragment? */
2790
2791 while (pbuf && ((msg_seqno(buf_msg(pbuf)) != long_msg_seq_no) ||
2792 (msg_orignode(fragm) != msg_orignode(buf_msg(pbuf))))) {
2793 prev = pbuf;
2794 pbuf = pbuf->next;
2795 }
2796
2797 if (!pbuf && (msg_type(fragm) == FIRST_FRAGMENT)) {
2798 struct tipc_msg *imsg = (struct tipc_msg *)msg_data(fragm);
2799 u32 msg_sz = msg_size(imsg);
2800 u32 fragm_sz = msg_data_sz(fragm);
2801 u32 exp_fragm_cnt = msg_sz/fragm_sz + !!(msg_sz % fragm_sz);
2802 u32 max = TIPC_MAX_USER_MSG_SIZE + LONG_H_SIZE;
2803 if (msg_type(imsg) == TIPC_MCAST_MSG)
2804 max = TIPC_MAX_USER_MSG_SIZE + MCAST_H_SIZE;
2805 if (msg_size(imsg) > max) {
2806 msg_dbg(fragm,"<REC<Oversized: ");
2807 buf_discard(fbuf);
2808 return 0;
2809 }
2810 pbuf = buf_acquire(msg_size(imsg));
2811 if (pbuf != NULL) {
2812 pbuf->next = *pending;
2813 *pending = pbuf;
2814 skb_copy_to_linear_data(pbuf, imsg,
2815 msg_data_sz(fragm));
2816 /* Prepare buffer for subsequent fragments. */
2817
2818 set_long_msg_seqno(pbuf, long_msg_seq_no);
2819 set_fragm_size(pbuf,fragm_sz);
2820 set_expected_frags(pbuf,exp_fragm_cnt - 1);
2821 } else {
2822 warn("Link unable to reassemble fragmented message\n");
2823 }
2824 buf_discard(fbuf);
2825 return 0;
2826 } else if (pbuf && (msg_type(fragm) != FIRST_FRAGMENT)) {
2827 u32 dsz = msg_data_sz(fragm);
2828 u32 fsz = get_fragm_size(pbuf);
2829 u32 crs = ((msg_fragm_no(fragm) - 1) * fsz);
2830 u32 exp_frags = get_expected_frags(pbuf) - 1;
2831 skb_copy_to_linear_data_offset(pbuf, crs,
2832 msg_data(fragm), dsz);
2833 buf_discard(fbuf);
2834
2835 /* Is message complete? */
2836
2837 if (exp_frags == 0) {
2838 if (prev)
2839 prev->next = pbuf->next;
2840 else
2841 *pending = pbuf->next;
2842 msg_reset_reroute_cnt(buf_msg(pbuf));
2843 *fb = pbuf;
2844 *m = buf_msg(pbuf);
2845 return 1;
2846 }
2847 set_expected_frags(pbuf,exp_frags);
2848 return 0;
2849 }
2850 dbg(" Discarding orphan fragment %x\n",fbuf);
2851 msg_dbg(fragm,"ORPHAN:");
2852 dbg("Pending long buffers:\n");
2853 dbg_print_buf_chain(*pending);
2854 buf_discard(fbuf);
2855 return 0;
2856 }
2857
2858 /**
2859 * link_check_defragm_bufs - flush stale incoming message fragments
2860 * @l_ptr: pointer to link
2861 */
2862
2863 static void link_check_defragm_bufs(struct link *l_ptr)
2864 {
2865 struct sk_buff *prev = NULL;
2866 struct sk_buff *next = NULL;
2867 struct sk_buff *buf = l_ptr->defragm_buf;
2868
2869 if (!buf)
2870 return;
2871 if (!link_working_working(l_ptr))
2872 return;
2873 while (buf) {
2874 u32 cnt = get_timer_cnt(buf);
2875
2876 next = buf->next;
2877 if (cnt < 4) {
2878 incr_timer_cnt(buf);
2879 prev = buf;
2880 } else {
2881 dbg(" Discarding incomplete long buffer\n");
2882 msg_dbg(buf_msg(buf), "LONG:");
2883 dbg_print_link(l_ptr, "curr:");
2884 dbg("Pending long buffers:\n");
2885 dbg_print_buf_chain(l_ptr->defragm_buf);
2886 if (prev)
2887 prev->next = buf->next;
2888 else
2889 l_ptr->defragm_buf = buf->next;
2890 buf_discard(buf);
2891 }
2892 buf = next;
2893 }
2894 }
2895
2896
2897
2898 static void link_set_supervision_props(struct link *l_ptr, u32 tolerance)
2899 {
2900 l_ptr->tolerance = tolerance;
2901 l_ptr->continuity_interval =
2902 ((tolerance / 4) > 500) ? 500 : tolerance / 4;
2903 l_ptr->abort_limit = tolerance / (l_ptr->continuity_interval / 4);
2904 }
2905
2906
2907 void tipc_link_set_queue_limits(struct link *l_ptr, u32 window)
2908 {
2909 /* Data messages from this node, inclusive FIRST_FRAGM */
2910 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE] = window;
2911 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE] = (window / 3) * 4;
2912 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE] = (window / 3) * 5;
2913 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE] = (window / 3) * 6;
2914 /* Transiting data messages,inclusive FIRST_FRAGM */
2915 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE + 4] = 300;
2916 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE + 4] = 600;
2917 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE + 4] = 900;
2918 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE + 4] = 1200;
2919 l_ptr->queue_limit[CONN_MANAGER] = 1200;
2920 l_ptr->queue_limit[ROUTE_DISTRIBUTOR] = 1200;
2921 l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
2922 l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
2923 /* FRAGMENT and LAST_FRAGMENT packets */
2924 l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
2925 }
2926
2927 /**
2928 * link_find_link - locate link by name
2929 * @name - ptr to link name string
2930 * @node - ptr to area to be filled with ptr to associated node
2931 *
2932 * Caller must hold 'tipc_net_lock' to ensure node and bearer are not deleted;
2933 * this also prevents link deletion.
2934 *
2935 * Returns pointer to link (or 0 if invalid link name).
2936 */
2937
2938 static struct link *link_find_link(const char *name, struct tipc_node **node)
2939 {
2940 struct link_name link_name_parts;
2941 struct bearer *b_ptr;
2942 struct link *l_ptr;
2943
2944 if (!link_name_validate(name, &link_name_parts))
2945 return NULL;
2946
2947 b_ptr = tipc_bearer_find_interface(link_name_parts.if_local);
2948 if (!b_ptr)
2949 return NULL;
2950
2951 *node = tipc_node_find(link_name_parts.addr_peer);
2952 if (!*node)
2953 return NULL;
2954
2955 l_ptr = (*node)->links[b_ptr->identity];
2956 if (!l_ptr || strcmp(l_ptr->name, name))
2957 return NULL;
2958
2959 return l_ptr;
2960 }
2961
2962 struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space,
2963 u16 cmd)
2964 {
2965 struct tipc_link_config *args;
2966 u32 new_value;
2967 struct link *l_ptr;
2968 struct tipc_node *node;
2969 int res;
2970
2971 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
2972 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
2973
2974 args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
2975 new_value = ntohl(args->value);
2976
2977 if (!strcmp(args->name, tipc_bclink_name)) {
2978 if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
2979 (tipc_bclink_set_queue_limits(new_value) == 0))
2980 return tipc_cfg_reply_none();
2981 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
2982 " (cannot change setting on broadcast link)");
2983 }
2984
2985 read_lock_bh(&tipc_net_lock);
2986 l_ptr = link_find_link(args->name, &node);
2987 if (!l_ptr) {
2988 read_unlock_bh(&tipc_net_lock);
2989 return tipc_cfg_reply_error_string("link not found");
2990 }
2991
2992 tipc_node_lock(node);
2993 res = -EINVAL;
2994 switch (cmd) {
2995 case TIPC_CMD_SET_LINK_TOL:
2996 if ((new_value >= TIPC_MIN_LINK_TOL) &&
2997 (new_value <= TIPC_MAX_LINK_TOL)) {
2998 link_set_supervision_props(l_ptr, new_value);
2999 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
3000 0, 0, new_value, 0, 0);
3001 res = 0;
3002 }
3003 break;
3004 case TIPC_CMD_SET_LINK_PRI:
3005 if ((new_value >= TIPC_MIN_LINK_PRI) &&
3006 (new_value <= TIPC_MAX_LINK_PRI)) {
3007 l_ptr->priority = new_value;
3008 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
3009 0, 0, 0, new_value, 0);
3010 res = 0;
3011 }
3012 break;
3013 case TIPC_CMD_SET_LINK_WINDOW:
3014 if ((new_value >= TIPC_MIN_LINK_WIN) &&
3015 (new_value <= TIPC_MAX_LINK_WIN)) {
3016 tipc_link_set_queue_limits(l_ptr, new_value);
3017 res = 0;
3018 }
3019 break;
3020 }
3021 tipc_node_unlock(node);
3022
3023 read_unlock_bh(&tipc_net_lock);
3024 if (res)
3025 return tipc_cfg_reply_error_string("cannot change link setting");
3026
3027 return tipc_cfg_reply_none();
3028 }
3029
3030 /**
3031 * link_reset_statistics - reset link statistics
3032 * @l_ptr: pointer to link
3033 */
3034
3035 static void link_reset_statistics(struct link *l_ptr)
3036 {
3037 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
3038 l_ptr->stats.sent_info = l_ptr->next_out_no;
3039 l_ptr->stats.recv_info = l_ptr->next_in_no;
3040 }
3041
3042 struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space)
3043 {
3044 char *link_name;
3045 struct link *l_ptr;
3046 struct tipc_node *node;
3047
3048 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
3049 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
3050
3051 link_name = (char *)TLV_DATA(req_tlv_area);
3052 if (!strcmp(link_name, tipc_bclink_name)) {
3053 if (tipc_bclink_reset_stats())
3054 return tipc_cfg_reply_error_string("link not found");
3055 return tipc_cfg_reply_none();
3056 }
3057
3058 read_lock_bh(&tipc_net_lock);
3059 l_ptr = link_find_link(link_name, &node);
3060 if (!l_ptr) {
3061 read_unlock_bh(&tipc_net_lock);
3062 return tipc_cfg_reply_error_string("link not found");
3063 }
3064
3065 tipc_node_lock(node);
3066 link_reset_statistics(l_ptr);
3067 tipc_node_unlock(node);
3068 read_unlock_bh(&tipc_net_lock);
3069 return tipc_cfg_reply_none();
3070 }
3071
3072 /**
3073 * percent - convert count to a percentage of total (rounding up or down)
3074 */
3075
3076 static u32 percent(u32 count, u32 total)
3077 {
3078 return (count * 100 + (total / 2)) / total;
3079 }
3080
3081 /**
3082 * tipc_link_stats - print link statistics
3083 * @name: link name
3084 * @buf: print buffer area
3085 * @buf_size: size of print buffer area
3086 *
3087 * Returns length of print buffer data string (or 0 if error)
3088 */
3089
3090 static int tipc_link_stats(const char *name, char *buf, const u32 buf_size)
3091 {
3092 struct print_buf pb;
3093 struct link *l_ptr;
3094 struct tipc_node *node;
3095 char *status;
3096 u32 profile_total = 0;
3097
3098 if (!strcmp(name, tipc_bclink_name))
3099 return tipc_bclink_stats(buf, buf_size);
3100
3101 tipc_printbuf_init(&pb, buf, buf_size);
3102
3103 read_lock_bh(&tipc_net_lock);
3104 l_ptr = link_find_link(name, &node);
3105 if (!l_ptr) {
3106 read_unlock_bh(&tipc_net_lock);
3107 return 0;
3108 }
3109 tipc_node_lock(node);
3110
3111 if (tipc_link_is_active(l_ptr))
3112 status = "ACTIVE";
3113 else if (tipc_link_is_up(l_ptr))
3114 status = "STANDBY";
3115 else
3116 status = "DEFUNCT";
3117 tipc_printf(&pb, "Link <%s>\n"
3118 " %s MTU:%u Priority:%u Tolerance:%u ms"
3119 " Window:%u packets\n",
3120 l_ptr->name, status, link_max_pkt(l_ptr),
3121 l_ptr->priority, l_ptr->tolerance, l_ptr->queue_limit[0]);
3122 tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
3123 l_ptr->next_in_no - l_ptr->stats.recv_info,
3124 l_ptr->stats.recv_fragments,
3125 l_ptr->stats.recv_fragmented,
3126 l_ptr->stats.recv_bundles,
3127 l_ptr->stats.recv_bundled);
3128 tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
3129 l_ptr->next_out_no - l_ptr->stats.sent_info,
3130 l_ptr->stats.sent_fragments,
3131 l_ptr->stats.sent_fragmented,
3132 l_ptr->stats.sent_bundles,
3133 l_ptr->stats.sent_bundled);
3134 profile_total = l_ptr->stats.msg_length_counts;
3135 if (!profile_total)
3136 profile_total = 1;
3137 tipc_printf(&pb, " TX profile sample:%u packets average:%u octets\n"
3138 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
3139 "-16354:%u%% -32768:%u%% -66000:%u%%\n",
3140 l_ptr->stats.msg_length_counts,
3141 l_ptr->stats.msg_lengths_total / profile_total,
3142 percent(l_ptr->stats.msg_length_profile[0], profile_total),
3143 percent(l_ptr->stats.msg_length_profile[1], profile_total),
3144 percent(l_ptr->stats.msg_length_profile[2], profile_total),
3145 percent(l_ptr->stats.msg_length_profile[3], profile_total),
3146 percent(l_ptr->stats.msg_length_profile[4], profile_total),
3147 percent(l_ptr->stats.msg_length_profile[5], profile_total),
3148 percent(l_ptr->stats.msg_length_profile[6], profile_total));
3149 tipc_printf(&pb, " RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
3150 l_ptr->stats.recv_states,
3151 l_ptr->stats.recv_probes,
3152 l_ptr->stats.recv_nacks,
3153 l_ptr->stats.deferred_recv,
3154 l_ptr->stats.duplicates);
3155 tipc_printf(&pb, " TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
3156 l_ptr->stats.sent_states,
3157 l_ptr->stats.sent_probes,
3158 l_ptr->stats.sent_nacks,
3159 l_ptr->stats.sent_acks,
3160 l_ptr->stats.retransmitted);
3161 tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
3162 l_ptr->stats.bearer_congs,
3163 l_ptr->stats.link_congs,
3164 l_ptr->stats.max_queue_sz,
3165 l_ptr->stats.queue_sz_counts
3166 ? (l_ptr->stats.accu_queue_sz / l_ptr->stats.queue_sz_counts)
3167 : 0);
3168
3169 tipc_node_unlock(node);
3170 read_unlock_bh(&tipc_net_lock);
3171 return tipc_printbuf_validate(&pb);
3172 }
3173
3174 #define MAX_LINK_STATS_INFO 2000
3175
3176 struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space)
3177 {
3178 struct sk_buff *buf;
3179 struct tlv_desc *rep_tlv;
3180 int str_len;
3181
3182 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
3183 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
3184
3185 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_LINK_STATS_INFO));
3186 if (!buf)
3187 return NULL;
3188
3189 rep_tlv = (struct tlv_desc *)buf->data;
3190
3191 str_len = tipc_link_stats((char *)TLV_DATA(req_tlv_area),
3192 (char *)TLV_DATA(rep_tlv), MAX_LINK_STATS_INFO);
3193 if (!str_len) {
3194 buf_discard(buf);
3195 return tipc_cfg_reply_error_string("link not found");
3196 }
3197
3198 skb_put(buf, TLV_SPACE(str_len));
3199 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
3200
3201 return buf;
3202 }
3203
3204 #if 0
3205 int link_control(const char *name, u32 op, u32 val)
3206 {
3207 int res = -EINVAL;
3208 struct link *l_ptr;
3209 u32 bearer_id;
3210 struct tipc_node * node;
3211 u32 a;
3212
3213 a = link_name2addr(name, &bearer_id);
3214 read_lock_bh(&tipc_net_lock);
3215 node = tipc_node_find(a);
3216 if (node) {
3217 tipc_node_lock(node);
3218 l_ptr = node->links[bearer_id];
3219 if (l_ptr) {
3220 if (op == TIPC_REMOVE_LINK) {
3221 struct bearer *b_ptr = l_ptr->b_ptr;
3222 spin_lock_bh(&b_ptr->publ.lock);
3223 tipc_link_delete(l_ptr);
3224 spin_unlock_bh(&b_ptr->publ.lock);
3225 }
3226 if (op == TIPC_CMD_BLOCK_LINK) {
3227 tipc_link_reset(l_ptr);
3228 l_ptr->blocked = 1;
3229 }
3230 if (op == TIPC_CMD_UNBLOCK_LINK) {
3231 l_ptr->blocked = 0;
3232 }
3233 res = 0;
3234 }
3235 tipc_node_unlock(node);
3236 }
3237 read_unlock_bh(&tipc_net_lock);
3238 return res;
3239 }
3240 #endif
3241
3242 /**
3243 * tipc_link_get_max_pkt - get maximum packet size to use when sending to destination
3244 * @dest: network address of destination node
3245 * @selector: used to select from set of active links
3246 *
3247 * If no active link can be found, uses default maximum packet size.
3248 */
3249
3250 u32 tipc_link_get_max_pkt(u32 dest, u32 selector)
3251 {
3252 struct tipc_node *n_ptr;
3253 struct link *l_ptr;
3254 u32 res = MAX_PKT_DEFAULT;
3255
3256 if (dest == tipc_own_addr)
3257 return MAX_MSG_SIZE;
3258
3259 read_lock_bh(&tipc_net_lock);
3260 n_ptr = tipc_node_select(dest, selector);
3261 if (n_ptr) {
3262 tipc_node_lock(n_ptr);
3263 l_ptr = n_ptr->active_links[selector & 1];
3264 if (l_ptr)
3265 res = link_max_pkt(l_ptr);
3266 tipc_node_unlock(n_ptr);
3267 }
3268 read_unlock_bh(&tipc_net_lock);
3269 return res;
3270 }
3271
3272 #if 0
3273 static void link_dump_rec_queue(struct link *l_ptr)
3274 {
3275 struct sk_buff *crs;
3276
3277 if (!l_ptr->oldest_deferred_in) {
3278 info("Reception queue empty\n");
3279 return;
3280 }
3281 info("Contents of Reception queue:\n");
3282 crs = l_ptr->oldest_deferred_in;
3283 while (crs) {
3284 if (crs->data == (void *)0x0000a3a3) {
3285 info("buffer %x invalid\n", crs);
3286 return;
3287 }
3288 msg_dbg(buf_msg(crs), "In rec queue: \n");
3289 crs = crs->next;
3290 }
3291 }
3292 #endif
3293
3294 static void link_dump_send_queue(struct link *l_ptr)
3295 {
3296 if (l_ptr->next_out) {
3297 info("\nContents of unsent queue:\n");
3298 dbg_print_buf_chain(l_ptr->next_out);
3299 }
3300 info("\nContents of send queue:\n");
3301 if (l_ptr->first_out) {
3302 dbg_print_buf_chain(l_ptr->first_out);
3303 }
3304 info("Empty send queue\n");
3305 }
3306
3307 static void link_print(struct link *l_ptr, struct print_buf *buf,
3308 const char *str)
3309 {
3310 tipc_printf(buf, str);
3311 if (link_reset_reset(l_ptr) || link_reset_unknown(l_ptr))
3312 return;
3313 tipc_printf(buf, "Link %x<%s>:",
3314 l_ptr->addr, l_ptr->b_ptr->publ.name);
3315 tipc_printf(buf, ": NXO(%u):", mod(l_ptr->next_out_no));
3316 tipc_printf(buf, "NXI(%u):", mod(l_ptr->next_in_no));
3317 tipc_printf(buf, "SQUE");
3318 if (l_ptr->first_out) {
3319 tipc_printf(buf, "[%u..", msg_seqno(buf_msg(l_ptr->first_out)));
3320 if (l_ptr->next_out)
3321 tipc_printf(buf, "%u..",
3322 msg_seqno(buf_msg(l_ptr->next_out)));
3323 tipc_printf(buf, "%u]",
3324 msg_seqno(buf_msg
3325 (l_ptr->last_out)), l_ptr->out_queue_size);
3326 if ((mod(msg_seqno(buf_msg(l_ptr->last_out)) -
3327 msg_seqno(buf_msg(l_ptr->first_out)))
3328 != (l_ptr->out_queue_size - 1)) ||
3329 (l_ptr->last_out->next != NULL)) {
3330 tipc_printf(buf, "\nSend queue inconsistency\n");
3331 tipc_printf(buf, "first_out= %x ", l_ptr->first_out);
3332 tipc_printf(buf, "next_out= %x ", l_ptr->next_out);
3333 tipc_printf(buf, "last_out= %x ", l_ptr->last_out);
3334 link_dump_send_queue(l_ptr);
3335 }
3336 } else
3337 tipc_printf(buf, "[]");
3338 tipc_printf(buf, "SQSIZ(%u)", l_ptr->out_queue_size);
3339 if (l_ptr->oldest_deferred_in) {
3340 u32 o = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
3341 u32 n = msg_seqno(buf_msg(l_ptr->newest_deferred_in));
3342 tipc_printf(buf, ":RQUE[%u..%u]", o, n);
3343 if (l_ptr->deferred_inqueue_sz != mod((n + 1) - o)) {
3344 tipc_printf(buf, ":RQSIZ(%u)",
3345 l_ptr->deferred_inqueue_sz);
3346 }
3347 }
3348 if (link_working_unknown(l_ptr))
3349 tipc_printf(buf, ":WU");
3350 if (link_reset_reset(l_ptr))
3351 tipc_printf(buf, ":RR");
3352 if (link_reset_unknown(l_ptr))
3353 tipc_printf(buf, ":RU");
3354 if (link_working_working(l_ptr))
3355 tipc_printf(buf, ":WW");
3356 tipc_printf(buf, "\n");
3357 }
3358
CRIS linux kernel tree