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Merge tag 'xtensa-next-20141215' of git://github.com/czankel/xtensa-linux
[linux/fpc-iii.git] / net / tipc / link.c
blob23bcc1132365128de97ee2de41c9465b1b5d03ff
1 /*
2 * net/tipc/link.c: TIPC link code
3 *
4 * Copyright (c) 1996-2007, 2012-2014, Ericsson AB
5 * Copyright (c) 2004-2007, 2010-2013, 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 "link.h"
39 #include "bcast.h"
40 #include "socket.h"
41 #include "name_distr.h"
42 #include "discover.h"
43 #include "config.h"
44 #include "netlink.h"
45
46 #include <linux/pkt_sched.h>
47
48 /*
49 * Error message prefixes
50 */
51 static const char *link_co_err = "Link changeover error, ";
52 static const char *link_rst_msg = "Resetting link ";
53 static const char *link_unk_evt = "Unknown link event ";
54
55 static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
56 [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC },
57 [TIPC_NLA_LINK_NAME] = {
58 .type = NLA_STRING,
59 .len = TIPC_MAX_LINK_NAME
60 },
61 [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 },
62 [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG },
63 [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG },
64 [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG },
65 [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED },
66 [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED },
67 [TIPC_NLA_LINK_RX] = { .type = NLA_U32 },
68 [TIPC_NLA_LINK_TX] = { .type = NLA_U32 }
69 };
70
71 /* Properties valid for media, bearar and link */
72 static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
73 [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC },
74 [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 },
75 [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 },
76 [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 }
77 };
78
79 /*
80 * Out-of-range value for link session numbers
81 */
82 #define INVALID_SESSION 0x10000
83
84 /*
85 * Link state events:
86 */
87 #define STARTING_EVT 856384768 /* link processing trigger */
88 #define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
89 #define TIMEOUT_EVT 560817u /* link timer expired */
90
91 /*
92 * The following two 'message types' is really just implementation
93 * data conveniently stored in the message header.
94 * They must not be considered part of the protocol
95 */
96 #define OPEN_MSG 0
97 #define CLOSED_MSG 1
98
99 /*
100 * State value stored in 'exp_msg_count'
101 */
102 #define START_CHANGEOVER 100000u
103
104 static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
105 struct sk_buff *buf);
106 static void tipc_link_proto_rcv(struct tipc_link *l_ptr, struct sk_buff *buf);
107 static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr,
108 struct sk_buff **buf);
109 static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tolerance);
110 static void link_state_event(struct tipc_link *l_ptr, u32 event);
111 static void link_reset_statistics(struct tipc_link *l_ptr);
112 static void link_print(struct tipc_link *l_ptr, const char *str);
113 static void tipc_link_sync_xmit(struct tipc_link *l);
114 static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);
115 static int tipc_link_input(struct tipc_link *l, struct sk_buff *buf);
116 static int tipc_link_prepare_input(struct tipc_link *l, struct sk_buff **buf);
117
118 /*
119 * Simple link routines
120 */
121 static unsigned int align(unsigned int i)
122 {
123 return (i + 3) & ~3u;
124 }
125
126 static void link_init_max_pkt(struct tipc_link *l_ptr)
127 {
128 struct tipc_bearer *b_ptr;
129 u32 max_pkt;
130
131 rcu_read_lock();
132 b_ptr = rcu_dereference_rtnl(bearer_list[l_ptr->bearer_id]);
133 if (!b_ptr) {
134 rcu_read_unlock();
135 return;
136 }
137 max_pkt = (b_ptr->mtu & ~3);
138 rcu_read_unlock();
139
140 if (max_pkt > MAX_MSG_SIZE)
141 max_pkt = MAX_MSG_SIZE;
142
143 l_ptr->max_pkt_target = max_pkt;
144 if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
145 l_ptr->max_pkt = l_ptr->max_pkt_target;
146 else
147 l_ptr->max_pkt = MAX_PKT_DEFAULT;
148
149 l_ptr->max_pkt_probes = 0;
150 }
151
152 /*
153 * Simple non-static link routines (i.e. referenced outside this file)
154 */
155 int tipc_link_is_up(struct tipc_link *l_ptr)
156 {
157 if (!l_ptr)
158 return 0;
159 return link_working_working(l_ptr) || link_working_unknown(l_ptr);
160 }
161
162 int tipc_link_is_active(struct tipc_link *l_ptr)
163 {
164 return (l_ptr->owner->active_links[0] == l_ptr) ||
165 (l_ptr->owner->active_links[1] == l_ptr);
166 }
167
168 /**
169 * link_timeout - handle expiration of link timer
170 * @l_ptr: pointer to link
171 */
172 static void link_timeout(struct tipc_link *l_ptr)
173 {
174 struct sk_buff *skb;
175
176 tipc_node_lock(l_ptr->owner);
177
178 /* update counters used in statistical profiling of send traffic */
179 l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->outqueue);
180 l_ptr->stats.queue_sz_counts++;
181
182 skb = skb_peek(&l_ptr->outqueue);
183 if (skb) {
184 struct tipc_msg *msg = buf_msg(skb);
185 u32 length = msg_size(msg);
186
187 if ((msg_user(msg) == MSG_FRAGMENTER) &&
188 (msg_type(msg) == FIRST_FRAGMENT)) {
189 length = msg_size(msg_get_wrapped(msg));
190 }
191 if (length) {
192 l_ptr->stats.msg_lengths_total += length;
193 l_ptr->stats.msg_length_counts++;
194 if (length <= 64)
195 l_ptr->stats.msg_length_profile[0]++;
196 else if (length <= 256)
197 l_ptr->stats.msg_length_profile[1]++;
198 else if (length <= 1024)
199 l_ptr->stats.msg_length_profile[2]++;
200 else if (length <= 4096)
201 l_ptr->stats.msg_length_profile[3]++;
202 else if (length <= 16384)
203 l_ptr->stats.msg_length_profile[4]++;
204 else if (length <= 32768)
205 l_ptr->stats.msg_length_profile[5]++;
206 else
207 l_ptr->stats.msg_length_profile[6]++;
208 }
209 }
210
211 /* do all other link processing performed on a periodic basis */
212 link_state_event(l_ptr, TIMEOUT_EVT);
213
214 if (l_ptr->next_out)
215 tipc_link_push_packets(l_ptr);
216
217 tipc_node_unlock(l_ptr->owner);
218 }
219
220 static void link_set_timer(struct tipc_link *l_ptr, u32 time)
221 {
222 k_start_timer(&l_ptr->timer, time);
223 }
224
225 /**
226 * tipc_link_create - create a new link
227 * @n_ptr: pointer to associated node
228 * @b_ptr: pointer to associated bearer
229 * @media_addr: media address to use when sending messages over link
230 *
231 * Returns pointer to link.
232 */
233 struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
234 struct tipc_bearer *b_ptr,
235 const struct tipc_media_addr *media_addr)
236 {
237 struct tipc_link *l_ptr;
238 struct tipc_msg *msg;
239 char *if_name;
240 char addr_string[16];
241 u32 peer = n_ptr->addr;
242
243 if (n_ptr->link_cnt >= MAX_BEARERS) {
244 tipc_addr_string_fill(addr_string, n_ptr->addr);
245 pr_err("Attempt to establish %uth link to %s. Max %u allowed.\n",
246 n_ptr->link_cnt, addr_string, MAX_BEARERS);
247 return NULL;
248 }
249
250 if (n_ptr->links[b_ptr->identity]) {
251 tipc_addr_string_fill(addr_string, n_ptr->addr);
252 pr_err("Attempt to establish second link on <%s> to %s\n",
253 b_ptr->name, addr_string);
254 return NULL;
255 }
256
257 l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
258 if (!l_ptr) {
259 pr_warn("Link creation failed, no memory\n");
260 return NULL;
261 }
262
263 l_ptr->addr = peer;
264 if_name = strchr(b_ptr->name, ':') + 1;
265 sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
266 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
267 tipc_node(tipc_own_addr),
268 if_name,
269 tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
270 /* note: peer i/f name is updated by reset/activate message */
271 memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
272 l_ptr->owner = n_ptr;
273 l_ptr->checkpoint = 1;
274 l_ptr->peer_session = INVALID_SESSION;
275 l_ptr->bearer_id = b_ptr->identity;
276 link_set_supervision_props(l_ptr, b_ptr->tolerance);
277 l_ptr->state = RESET_UNKNOWN;
278
279 l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
280 msg = l_ptr->pmsg;
281 tipc_msg_init(msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, l_ptr->addr);
282 msg_set_size(msg, sizeof(l_ptr->proto_msg));
283 msg_set_session(msg, (tipc_random & 0xffff));
284 msg_set_bearer_id(msg, b_ptr->identity);
285 strcpy((char *)msg_data(msg), if_name);
286
287 l_ptr->priority = b_ptr->priority;
288 tipc_link_set_queue_limits(l_ptr, b_ptr->window);
289
290 l_ptr->net_plane = b_ptr->net_plane;
291 link_init_max_pkt(l_ptr);
292
293 l_ptr->next_out_no = 1;
294 __skb_queue_head_init(&l_ptr->outqueue);
295 __skb_queue_head_init(&l_ptr->deferred_queue);
296 skb_queue_head_init(&l_ptr->waiting_sks);
297
298 link_reset_statistics(l_ptr);
299
300 tipc_node_attach_link(n_ptr, l_ptr);
301
302 k_init_timer(&l_ptr->timer, (Handler)link_timeout,
303 (unsigned long)l_ptr);
304
305 link_state_event(l_ptr, STARTING_EVT);
306
307 return l_ptr;
308 }
309
310 void tipc_link_delete_list(unsigned int bearer_id, bool shutting_down)
311 {
312 struct tipc_link *l_ptr;
313 struct tipc_node *n_ptr;
314
315 rcu_read_lock();
316 list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
317 tipc_node_lock(n_ptr);
318 l_ptr = n_ptr->links[bearer_id];
319 if (l_ptr) {
320 tipc_link_reset(l_ptr);
321 if (shutting_down || !tipc_node_is_up(n_ptr)) {
322 tipc_node_detach_link(l_ptr->owner, l_ptr);
323 tipc_link_reset_fragments(l_ptr);
324 tipc_node_unlock(n_ptr);
325
326 /* Nobody else can access this link now: */
327 del_timer_sync(&l_ptr->timer);
328 kfree(l_ptr);
329 } else {
330 /* Detach/delete when failover is finished: */
331 l_ptr->flags |= LINK_STOPPED;
332 tipc_node_unlock(n_ptr);
333 del_timer_sync(&l_ptr->timer);
334 }
335 continue;
336 }
337 tipc_node_unlock(n_ptr);
338 }
339 rcu_read_unlock();
340 }
341
342 /**
343 * link_schedule_user - schedule user for wakeup after congestion
344 * @link: congested link
345 * @oport: sending port
346 * @chain_sz: size of buffer chain that was attempted sent
347 * @imp: importance of message attempted sent
348 * Create pseudo msg to send back to user when congestion abates
349 */
350 static bool link_schedule_user(struct tipc_link *link, u32 oport,
351 uint chain_sz, uint imp)
352 {
353 struct sk_buff *buf;
354
355 buf = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, tipc_own_addr,
356 tipc_own_addr, oport, 0, 0);
357 if (!buf)
358 return false;
359 TIPC_SKB_CB(buf)->chain_sz = chain_sz;
360 TIPC_SKB_CB(buf)->chain_imp = imp;
361 skb_queue_tail(&link->waiting_sks, buf);
362 link->stats.link_congs++;
363 return true;
364 }
365
366 /**
367 * link_prepare_wakeup - prepare users for wakeup after congestion
368 * @link: congested link
369 * Move a number of waiting users, as permitted by available space in
370 * the send queue, from link wait queue to node wait queue for wakeup
371 */
372 static void link_prepare_wakeup(struct tipc_link *link)
373 {
374 uint pend_qsz = skb_queue_len(&link->outqueue);
375 struct sk_buff *skb, *tmp;
376
377 skb_queue_walk_safe(&link->waiting_sks, skb, tmp) {
378 if (pend_qsz >= link->queue_limit[TIPC_SKB_CB(skb)->chain_imp])
379 break;
380 pend_qsz += TIPC_SKB_CB(skb)->chain_sz;
381 skb_unlink(skb, &link->waiting_sks);
382 skb_queue_tail(&link->owner->waiting_sks, skb);
383 }
384 }
385
386 /**
387 * tipc_link_reset_fragments - purge link's inbound message fragments queue
388 * @l_ptr: pointer to link
389 */
390 void tipc_link_reset_fragments(struct tipc_link *l_ptr)
391 {
392 kfree_skb(l_ptr->reasm_buf);
393 l_ptr->reasm_buf = NULL;
394 }
395
396 /**
397 * tipc_link_purge_queues - purge all pkt queues associated with link
398 * @l_ptr: pointer to link
399 */
400 void tipc_link_purge_queues(struct tipc_link *l_ptr)
401 {
402 __skb_queue_purge(&l_ptr->deferred_queue);
403 __skb_queue_purge(&l_ptr->outqueue);
404 tipc_link_reset_fragments(l_ptr);
405 }
406
407 void tipc_link_reset(struct tipc_link *l_ptr)
408 {
409 u32 prev_state = l_ptr->state;
410 u32 checkpoint = l_ptr->next_in_no;
411 int was_active_link = tipc_link_is_active(l_ptr);
412 struct tipc_node *owner = l_ptr->owner;
413
414 msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff));
415
416 /* Link is down, accept any session */
417 l_ptr->peer_session = INVALID_SESSION;
418
419 /* Prepare for max packet size negotiation */
420 link_init_max_pkt(l_ptr);
421
422 l_ptr->state = RESET_UNKNOWN;
423
424 if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
425 return;
426
427 tipc_node_link_down(l_ptr->owner, l_ptr);
428 tipc_bearer_remove_dest(l_ptr->bearer_id, l_ptr->addr);
429
430 if (was_active_link && tipc_node_active_links(l_ptr->owner)) {
431 l_ptr->reset_checkpoint = checkpoint;
432 l_ptr->exp_msg_count = START_CHANGEOVER;
433 }
434
435 /* Clean up all queues: */
436 __skb_queue_purge(&l_ptr->outqueue);
437 __skb_queue_purge(&l_ptr->deferred_queue);
438 if (!skb_queue_empty(&l_ptr->waiting_sks)) {
439 skb_queue_splice_init(&l_ptr->waiting_sks, &owner->waiting_sks);
440 owner->action_flags |= TIPC_WAKEUP_USERS;
441 }
442 l_ptr->next_out = NULL;
443 l_ptr->unacked_window = 0;
444 l_ptr->checkpoint = 1;
445 l_ptr->next_out_no = 1;
446 l_ptr->fsm_msg_cnt = 0;
447 l_ptr->stale_count = 0;
448 link_reset_statistics(l_ptr);
449 }
450
451 void tipc_link_reset_list(unsigned int bearer_id)
452 {
453 struct tipc_link *l_ptr;
454 struct tipc_node *n_ptr;
455
456 rcu_read_lock();
457 list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
458 tipc_node_lock(n_ptr);
459 l_ptr = n_ptr->links[bearer_id];
460 if (l_ptr)
461 tipc_link_reset(l_ptr);
462 tipc_node_unlock(n_ptr);
463 }
464 rcu_read_unlock();
465 }
466
467 static void link_activate(struct tipc_link *l_ptr)
468 {
469 l_ptr->next_in_no = l_ptr->stats.recv_info = 1;
470 tipc_node_link_up(l_ptr->owner, l_ptr);
471 tipc_bearer_add_dest(l_ptr->bearer_id, l_ptr->addr);
472 }
473
474 /**
475 * link_state_event - link finite state machine
476 * @l_ptr: pointer to link
477 * @event: state machine event to process
478 */
479 static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
480 {
481 struct tipc_link *other;
482 u32 cont_intv = l_ptr->continuity_interval;
483
484 if (l_ptr->flags & LINK_STOPPED)
485 return;
486
487 if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT))
488 return; /* Not yet. */
489
490 /* Check whether changeover is going on */
491 if (l_ptr->exp_msg_count) {
492 if (event == TIMEOUT_EVT)
493 link_set_timer(l_ptr, cont_intv);
494 return;
495 }
496
497 switch (l_ptr->state) {
498 case WORKING_WORKING:
499 switch (event) {
500 case TRAFFIC_MSG_EVT:
501 case ACTIVATE_MSG:
502 break;
503 case TIMEOUT_EVT:
504 if (l_ptr->next_in_no != l_ptr->checkpoint) {
505 l_ptr->checkpoint = l_ptr->next_in_no;
506 if (tipc_bclink_acks_missing(l_ptr->owner)) {
507 tipc_link_proto_xmit(l_ptr, STATE_MSG,
508 0, 0, 0, 0, 0);
509 l_ptr->fsm_msg_cnt++;
510 } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
511 tipc_link_proto_xmit(l_ptr, STATE_MSG,
512 1, 0, 0, 0, 0);
513 l_ptr->fsm_msg_cnt++;
514 }
515 link_set_timer(l_ptr, cont_intv);
516 break;
517 }
518 l_ptr->state = WORKING_UNKNOWN;
519 l_ptr->fsm_msg_cnt = 0;
520 tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
521 l_ptr->fsm_msg_cnt++;
522 link_set_timer(l_ptr, cont_intv / 4);
523 break;
524 case RESET_MSG:
525 pr_info("%s<%s>, requested by peer\n", link_rst_msg,
526 l_ptr->name);
527 tipc_link_reset(l_ptr);
528 l_ptr->state = RESET_RESET;
529 l_ptr->fsm_msg_cnt = 0;
530 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
531 0, 0, 0, 0, 0);
532 l_ptr->fsm_msg_cnt++;
533 link_set_timer(l_ptr, cont_intv);
534 break;
535 default:
536 pr_err("%s%u in WW state\n", link_unk_evt, event);
537 }
538 break;
539 case WORKING_UNKNOWN:
540 switch (event) {
541 case TRAFFIC_MSG_EVT:
542 case ACTIVATE_MSG:
543 l_ptr->state = WORKING_WORKING;
544 l_ptr->fsm_msg_cnt = 0;
545 link_set_timer(l_ptr, cont_intv);
546 break;
547 case RESET_MSG:
548 pr_info("%s<%s>, requested by peer while probing\n",
549 link_rst_msg, l_ptr->name);
550 tipc_link_reset(l_ptr);
551 l_ptr->state = RESET_RESET;
552 l_ptr->fsm_msg_cnt = 0;
553 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
554 0, 0, 0, 0, 0);
555 l_ptr->fsm_msg_cnt++;
556 link_set_timer(l_ptr, cont_intv);
557 break;
558 case TIMEOUT_EVT:
559 if (l_ptr->next_in_no != l_ptr->checkpoint) {
560 l_ptr->state = WORKING_WORKING;
561 l_ptr->fsm_msg_cnt = 0;
562 l_ptr->checkpoint = l_ptr->next_in_no;
563 if (tipc_bclink_acks_missing(l_ptr->owner)) {
564 tipc_link_proto_xmit(l_ptr, STATE_MSG,
565 0, 0, 0, 0, 0);
566 l_ptr->fsm_msg_cnt++;
567 }
568 link_set_timer(l_ptr, cont_intv);
569 } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
570 tipc_link_proto_xmit(l_ptr, STATE_MSG,
571 1, 0, 0, 0, 0);
572 l_ptr->fsm_msg_cnt++;
573 link_set_timer(l_ptr, cont_intv / 4);
574 } else { /* Link has failed */
575 pr_warn("%s<%s>, peer not responding\n",
576 link_rst_msg, l_ptr->name);
577 tipc_link_reset(l_ptr);
578 l_ptr->state = RESET_UNKNOWN;
579 l_ptr->fsm_msg_cnt = 0;
580 tipc_link_proto_xmit(l_ptr, RESET_MSG,
581 0, 0, 0, 0, 0);
582 l_ptr->fsm_msg_cnt++;
583 link_set_timer(l_ptr, cont_intv);
584 }
585 break;
586 default:
587 pr_err("%s%u in WU state\n", link_unk_evt, event);
588 }
589 break;
590 case RESET_UNKNOWN:
591 switch (event) {
592 case TRAFFIC_MSG_EVT:
593 break;
594 case ACTIVATE_MSG:
595 other = l_ptr->owner->active_links[0];
596 if (other && link_working_unknown(other))
597 break;
598 l_ptr->state = WORKING_WORKING;
599 l_ptr->fsm_msg_cnt = 0;
600 link_activate(l_ptr);
601 tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
602 l_ptr->fsm_msg_cnt++;
603 if (l_ptr->owner->working_links == 1)
604 tipc_link_sync_xmit(l_ptr);
605 link_set_timer(l_ptr, cont_intv);
606 break;
607 case RESET_MSG:
608 l_ptr->state = RESET_RESET;
609 l_ptr->fsm_msg_cnt = 0;
610 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
611 1, 0, 0, 0, 0);
612 l_ptr->fsm_msg_cnt++;
613 link_set_timer(l_ptr, cont_intv);
614 break;
615 case STARTING_EVT:
616 l_ptr->flags |= LINK_STARTED;
617 /* fall through */
618 case TIMEOUT_EVT:
619 tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
620 l_ptr->fsm_msg_cnt++;
621 link_set_timer(l_ptr, cont_intv);
622 break;
623 default:
624 pr_err("%s%u in RU state\n", link_unk_evt, event);
625 }
626 break;
627 case RESET_RESET:
628 switch (event) {
629 case TRAFFIC_MSG_EVT:
630 case ACTIVATE_MSG:
631 other = l_ptr->owner->active_links[0];
632 if (other && link_working_unknown(other))
633 break;
634 l_ptr->state = WORKING_WORKING;
635 l_ptr->fsm_msg_cnt = 0;
636 link_activate(l_ptr);
637 tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
638 l_ptr->fsm_msg_cnt++;
639 if (l_ptr->owner->working_links == 1)
640 tipc_link_sync_xmit(l_ptr);
641 link_set_timer(l_ptr, cont_intv);
642 break;
643 case RESET_MSG:
644 break;
645 case TIMEOUT_EVT:
646 tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
647 0, 0, 0, 0, 0);
648 l_ptr->fsm_msg_cnt++;
649 link_set_timer(l_ptr, cont_intv);
650 break;
651 default:
652 pr_err("%s%u in RR state\n", link_unk_evt, event);
653 }
654 break;
655 default:
656 pr_err("Unknown link state %u/%u\n", l_ptr->state, event);
657 }
658 }
659
660 /* tipc_link_cong: determine return value and how to treat the
661 * sent buffer during link congestion.
662 * - For plain, errorless user data messages we keep the buffer and
663 * return -ELINKONG.
664 * - For all other messages we discard the buffer and return -EHOSTUNREACH
665 * - For TIPC internal messages we also reset the link
666 */
667 static int tipc_link_cong(struct tipc_link *link, struct sk_buff_head *list)
668 {
669 struct sk_buff *skb = skb_peek(list);
670 struct tipc_msg *msg = buf_msg(skb);
671 uint imp = tipc_msg_tot_importance(msg);
672 u32 oport = msg_tot_origport(msg);
673
674 if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) {
675 pr_warn("%s<%s>, send queue full", link_rst_msg, link->name);
676 tipc_link_reset(link);
677 goto drop;
678 }
679 if (unlikely(msg_errcode(msg)))
680 goto drop;
681 if (unlikely(msg_reroute_cnt(msg)))
682 goto drop;
683 if (TIPC_SKB_CB(skb)->wakeup_pending)
684 return -ELINKCONG;
685 if (link_schedule_user(link, oport, skb_queue_len(list), imp))
686 return -ELINKCONG;
687 drop:
688 __skb_queue_purge(list);
689 return -EHOSTUNREACH;
690 }
691
692 /**
693 * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked
694 * @link: link to use
695 * @list: chain of buffers containing message
696 *
697 * Consumes the buffer chain, except when returning -ELINKCONG
698 * Returns 0 if success, otherwise errno: -ELINKCONG, -EMSGSIZE (plain socket
699 * user data messages) or -EHOSTUNREACH (all other messages/senders)
700 * Only the socket functions tipc_send_stream() and tipc_send_packet() need
701 * to act on the return value, since they may need to do more send attempts.
702 */
703 int __tipc_link_xmit(struct tipc_link *link, struct sk_buff_head *list)
704 {
705 struct tipc_msg *msg = buf_msg(skb_peek(list));
706 uint psz = msg_size(msg);
707 uint sndlim = link->queue_limit[0];
708 uint imp = tipc_msg_tot_importance(msg);
709 uint mtu = link->max_pkt;
710 uint ack = mod(link->next_in_no - 1);
711 uint seqno = link->next_out_no;
712 uint bc_last_in = link->owner->bclink.last_in;
713 struct tipc_media_addr *addr = &link->media_addr;
714 struct sk_buff_head *outqueue = &link->outqueue;
715 struct sk_buff *skb, *tmp;
716
717 /* Match queue limits against msg importance: */
718 if (unlikely(skb_queue_len(outqueue) >= link->queue_limit[imp]))
719 return tipc_link_cong(link, list);
720
721 /* Has valid packet limit been used ? */
722 if (unlikely(psz > mtu)) {
723 __skb_queue_purge(list);
724 return -EMSGSIZE;
725 }
726
727 /* Prepare each packet for sending, and add to outqueue: */
728 skb_queue_walk_safe(list, skb, tmp) {
729 __skb_unlink(skb, list);
730 msg = buf_msg(skb);
731 msg_set_word(msg, 2, ((ack << 16) | mod(seqno)));
732 msg_set_bcast_ack(msg, bc_last_in);
733
734 if (skb_queue_len(outqueue) < sndlim) {
735 __skb_queue_tail(outqueue, skb);
736 tipc_bearer_send(link->bearer_id, skb, addr);
737 link->next_out = NULL;
738 link->unacked_window = 0;
739 } else if (tipc_msg_bundle(outqueue, skb, mtu)) {
740 link->stats.sent_bundled++;
741 continue;
742 } else if (tipc_msg_make_bundle(outqueue, skb, mtu,
743 link->addr)) {
744 link->stats.sent_bundled++;
745 link->stats.sent_bundles++;
746 if (!link->next_out)
747 link->next_out = skb_peek_tail(outqueue);
748 } else {
749 __skb_queue_tail(outqueue, skb);
750 if (!link->next_out)
751 link->next_out = skb;
752 }
753 seqno++;
754 }
755 link->next_out_no = seqno;
756 return 0;
757 }
758
759 static void skb2list(struct sk_buff *skb, struct sk_buff_head *list)
760 {
761 __skb_queue_head_init(list);
762 __skb_queue_tail(list, skb);
763 }
764
765 static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb)
766 {
767 struct sk_buff_head head;
768
769 skb2list(skb, &head);
770 return __tipc_link_xmit(link, &head);
771 }
772
773 int tipc_link_xmit_skb(struct sk_buff *skb, u32 dnode, u32 selector)
774 {
775 struct sk_buff_head head;
776
777 skb2list(skb, &head);
778 return tipc_link_xmit(&head, dnode, selector);
779 }
780
781 /**
782 * tipc_link_xmit() is the general link level function for message sending
783 * @list: chain of buffers containing message
784 * @dsz: amount of user data to be sent
785 * @dnode: address of destination node
786 * @selector: a number used for deterministic link selection
787 * Consumes the buffer chain, except when returning -ELINKCONG
788 * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
789 */
790 int tipc_link_xmit(struct sk_buff_head *list, u32 dnode, u32 selector)
791 {
792 struct tipc_link *link = NULL;
793 struct tipc_node *node;
794 int rc = -EHOSTUNREACH;
795
796 node = tipc_node_find(dnode);
797 if (node) {
798 tipc_node_lock(node);
799 link = node->active_links[selector & 1];
800 if (link)
801 rc = __tipc_link_xmit(link, list);
802 tipc_node_unlock(node);
803 }
804
805 if (link)
806 return rc;
807
808 if (likely(in_own_node(dnode))) {
809 /* As a node local message chain never contains more than one
810 * buffer, we just need to dequeue one SKB buffer from the
811 * head list.
812 */
813 return tipc_sk_rcv(__skb_dequeue(list));
814 }
815 __skb_queue_purge(list);
816
817 return rc;
818 }
819
820 /*
821 * tipc_link_sync_xmit - synchronize broadcast link endpoints.
822 *
823 * Give a newly added peer node the sequence number where it should
824 * start receiving and acking broadcast packets.
825 *
826 * Called with node locked
827 */
828 static void tipc_link_sync_xmit(struct tipc_link *link)
829 {
830 struct sk_buff *skb;
831 struct tipc_msg *msg;
832
833 skb = tipc_buf_acquire(INT_H_SIZE);
834 if (!skb)
835 return;
836
837 msg = buf_msg(skb);
838 tipc_msg_init(msg, BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, link->addr);
839 msg_set_last_bcast(msg, link->owner->bclink.acked);
840 __tipc_link_xmit_skb(link, skb);
841 }
842
843 /*
844 * tipc_link_sync_rcv - synchronize broadcast link endpoints.
845 * Receive the sequence number where we should start receiving and
846 * acking broadcast packets from a newly added peer node, and open
847 * up for reception of such packets.
848 *
849 * Called with node locked
850 */
851 static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf)
852 {
853 struct tipc_msg *msg = buf_msg(buf);
854
855 n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg);
856 n->bclink.recv_permitted = true;
857 kfree_skb(buf);
858 }
859
860 struct sk_buff *tipc_skb_queue_next(const struct sk_buff_head *list,
861 const struct sk_buff *skb)
862 {
863 if (skb_queue_is_last(list, skb))
864 return NULL;
865 return skb->next;
866 }
867
868 /*
869 * tipc_link_push_packets - push unsent packets to bearer
870 *
871 * Push out the unsent messages of a link where congestion
872 * has abated. Node is locked.
873 *
874 * Called with node locked
875 */
876 void tipc_link_push_packets(struct tipc_link *l_ptr)
877 {
878 struct sk_buff_head *outqueue = &l_ptr->outqueue;
879 struct sk_buff *skb = l_ptr->next_out;
880 struct tipc_msg *msg;
881 u32 next, first;
882
883 skb_queue_walk_from(outqueue, skb) {
884 msg = buf_msg(skb);
885 next = msg_seqno(msg);
886 first = buf_seqno(skb_peek(outqueue));
887
888 if (mod(next - first) < l_ptr->queue_limit[0]) {
889 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
890 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
891 if (msg_user(msg) == MSG_BUNDLER)
892 TIPC_SKB_CB(skb)->bundling = false;
893 tipc_bearer_send(l_ptr->bearer_id, skb,
894 &l_ptr->media_addr);
895 l_ptr->next_out = tipc_skb_queue_next(outqueue, skb);
896 } else {
897 break;
898 }
899 }
900 }
901
902 void tipc_link_reset_all(struct tipc_node *node)
903 {
904 char addr_string[16];
905 u32 i;
906
907 tipc_node_lock(node);
908
909 pr_warn("Resetting all links to %s\n",
910 tipc_addr_string_fill(addr_string, node->addr));
911
912 for (i = 0; i < MAX_BEARERS; i++) {
913 if (node->links[i]) {
914 link_print(node->links[i], "Resetting link\n");
915 tipc_link_reset(node->links[i]);
916 }
917 }
918
919 tipc_node_unlock(node);
920 }
921
922 static void link_retransmit_failure(struct tipc_link *l_ptr,
923 struct sk_buff *buf)
924 {
925 struct tipc_msg *msg = buf_msg(buf);
926
927 pr_warn("Retransmission failure on link <%s>\n", l_ptr->name);
928
929 if (l_ptr->addr) {
930 /* Handle failure on standard link */
931 link_print(l_ptr, "Resetting link\n");
932 tipc_link_reset(l_ptr);
933
934 } else {
935 /* Handle failure on broadcast link */
936 struct tipc_node *n_ptr;
937 char addr_string[16];
938
939 pr_info("Msg seq number: %u, ", msg_seqno(msg));
940 pr_cont("Outstanding acks: %lu\n",
941 (unsigned long) TIPC_SKB_CB(buf)->handle);
942
943 n_ptr = tipc_bclink_retransmit_to();
944 tipc_node_lock(n_ptr);
945
946 tipc_addr_string_fill(addr_string, n_ptr->addr);
947 pr_info("Broadcast link info for %s\n", addr_string);
948 pr_info("Reception permitted: %d, Acked: %u\n",
949 n_ptr->bclink.recv_permitted,
950 n_ptr->bclink.acked);
951 pr_info("Last in: %u, Oos state: %u, Last sent: %u\n",
952 n_ptr->bclink.last_in,
953 n_ptr->bclink.oos_state,
954 n_ptr->bclink.last_sent);
955
956 tipc_node_unlock(n_ptr);
957
958 tipc_bclink_set_flags(TIPC_BCLINK_RESET);
959 l_ptr->stale_count = 0;
960 }
961 }
962
963 void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb,
964 u32 retransmits)
965 {
966 struct tipc_msg *msg;
967
968 if (!skb)
969 return;
970
971 msg = buf_msg(skb);
972
973 /* Detect repeated retransmit failures */
974 if (l_ptr->last_retransmitted == msg_seqno(msg)) {
975 if (++l_ptr->stale_count > 100) {
976 link_retransmit_failure(l_ptr, skb);
977 return;
978 }
979 } else {
980 l_ptr->last_retransmitted = msg_seqno(msg);
981 l_ptr->stale_count = 1;
982 }
983
984 skb_queue_walk_from(&l_ptr->outqueue, skb) {
985 if (!retransmits || skb == l_ptr->next_out)
986 break;
987 msg = buf_msg(skb);
988 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
989 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
990 tipc_bearer_send(l_ptr->bearer_id, skb, &l_ptr->media_addr);
991 retransmits--;
992 l_ptr->stats.retransmitted++;
993 }
994 }
995
996 static void link_retrieve_defq(struct tipc_link *link,
997 struct sk_buff_head *list)
998 {
999 u32 seq_no;
1000
1001 if (skb_queue_empty(&link->deferred_queue))
1002 return;
1003
1004 seq_no = buf_seqno(skb_peek(&link->deferred_queue));
1005 if (seq_no == mod(link->next_in_no))
1006 skb_queue_splice_tail_init(&link->deferred_queue, list);
1007 }
1008
1009 /**
1010 * link_recv_buf_validate - validate basic format of received message
1011 *
1012 * This routine ensures a TIPC message has an acceptable header, and at least
1013 * as much data as the header indicates it should. The routine also ensures
1014 * that the entire message header is stored in the main fragment of the message
1015 * buffer, to simplify future access to message header fields.
1016 *
1017 * Note: Having extra info present in the message header or data areas is OK.
1018 * TIPC will ignore the excess, under the assumption that it is optional info
1019 * introduced by a later release of the protocol.
1020 */
1021 static int link_recv_buf_validate(struct sk_buff *buf)
1022 {
1023 static u32 min_data_hdr_size[8] = {
1024 SHORT_H_SIZE, MCAST_H_SIZE, NAMED_H_SIZE, BASIC_H_SIZE,
1025 MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE, MAX_H_SIZE
1026 };
1027
1028 struct tipc_msg *msg;
1029 u32 tipc_hdr[2];
1030 u32 size;
1031 u32 hdr_size;
1032 u32 min_hdr_size;
1033
1034 /* If this packet comes from the defer queue, the skb has already
1035 * been validated
1036 */
1037 if (unlikely(TIPC_SKB_CB(buf)->deferred))
1038 return 1;
1039
1040 if (unlikely(buf->len < MIN_H_SIZE))
1041 return 0;
1042
1043 msg = skb_header_pointer(buf, 0, sizeof(tipc_hdr), tipc_hdr);
1044 if (msg == NULL)
1045 return 0;
1046
1047 if (unlikely(msg_version(msg) != TIPC_VERSION))
1048 return 0;
1049
1050 size = msg_size(msg);
1051 hdr_size = msg_hdr_sz(msg);
1052 min_hdr_size = msg_isdata(msg) ?
1053 min_data_hdr_size[msg_type(msg)] : INT_H_SIZE;
1054
1055 if (unlikely((hdr_size < min_hdr_size) ||
1056 (size < hdr_size) ||
1057 (buf->len < size) ||
1058 (size - hdr_size > TIPC_MAX_USER_MSG_SIZE)))
1059 return 0;
1060
1061 return pskb_may_pull(buf, hdr_size);
1062 }
1063
1064 /**
1065 * tipc_rcv - process TIPC packets/messages arriving from off-node
1066 * @skb: TIPC packet
1067 * @b_ptr: pointer to bearer message arrived on
1068 *
1069 * Invoked with no locks held. Bearer pointer must point to a valid bearer
1070 * structure (i.e. cannot be NULL), but bearer can be inactive.
1071 */
1072 void tipc_rcv(struct sk_buff *skb, struct tipc_bearer *b_ptr)
1073 {
1074 struct sk_buff_head head;
1075 struct tipc_node *n_ptr;
1076 struct tipc_link *l_ptr;
1077 struct sk_buff *skb1, *tmp;
1078 struct tipc_msg *msg;
1079 u32 seq_no;
1080 u32 ackd;
1081 u32 released;
1082
1083 skb2list(skb, &head);
1084
1085 while ((skb = __skb_dequeue(&head))) {
1086 /* Ensure message is well-formed */
1087 if (unlikely(!link_recv_buf_validate(skb)))
1088 goto discard;
1089
1090 /* Ensure message data is a single contiguous unit */
1091 if (unlikely(skb_linearize(skb)))
1092 goto discard;
1093
1094 /* Handle arrival of a non-unicast link message */
1095 msg = buf_msg(skb);
1096
1097 if (unlikely(msg_non_seq(msg))) {
1098 if (msg_user(msg) == LINK_CONFIG)
1099 tipc_disc_rcv(skb, b_ptr);
1100 else
1101 tipc_bclink_rcv(skb);
1102 continue;
1103 }
1104
1105 /* Discard unicast link messages destined for another node */
1106 if (unlikely(!msg_short(msg) &&
1107 (msg_destnode(msg) != tipc_own_addr)))
1108 goto discard;
1109
1110 /* Locate neighboring node that sent message */
1111 n_ptr = tipc_node_find(msg_prevnode(msg));
1112 if (unlikely(!n_ptr))
1113 goto discard;
1114 tipc_node_lock(n_ptr);
1115
1116 /* Locate unicast link endpoint that should handle message */
1117 l_ptr = n_ptr->links[b_ptr->identity];
1118 if (unlikely(!l_ptr))
1119 goto unlock_discard;
1120
1121 /* Verify that communication with node is currently allowed */
1122 if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) &&
1123 msg_user(msg) == LINK_PROTOCOL &&
1124 (msg_type(msg) == RESET_MSG ||
1125 msg_type(msg) == ACTIVATE_MSG) &&
1126 !msg_redundant_link(msg))
1127 n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN;
1128
1129 if (tipc_node_blocked(n_ptr))
1130 goto unlock_discard;
1131
1132 /* Validate message sequence number info */
1133 seq_no = msg_seqno(msg);
1134 ackd = msg_ack(msg);
1135
1136 /* Release acked messages */
1137 if (n_ptr->bclink.recv_permitted)
1138 tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
1139
1140 released = 0;
1141 skb_queue_walk_safe(&l_ptr->outqueue, skb1, tmp) {
1142 if (skb1 == l_ptr->next_out ||
1143 more(buf_seqno(skb1), ackd))
1144 break;
1145 __skb_unlink(skb1, &l_ptr->outqueue);
1146 kfree_skb(skb1);
1147 released = 1;
1148 }
1149
1150 /* Try sending any messages link endpoint has pending */
1151 if (unlikely(l_ptr->next_out))
1152 tipc_link_push_packets(l_ptr);
1153
1154 if (released && !skb_queue_empty(&l_ptr->waiting_sks)) {
1155 link_prepare_wakeup(l_ptr);
1156 l_ptr->owner->action_flags |= TIPC_WAKEUP_USERS;
1157 }
1158
1159 /* Process the incoming packet */
1160 if (unlikely(!link_working_working(l_ptr))) {
1161 if (msg_user(msg) == LINK_PROTOCOL) {
1162 tipc_link_proto_rcv(l_ptr, skb);
1163 link_retrieve_defq(l_ptr, &head);
1164 tipc_node_unlock(n_ptr);
1165 continue;
1166 }
1167
1168 /* Traffic message. Conditionally activate link */
1169 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1170
1171 if (link_working_working(l_ptr)) {
1172 /* Re-insert buffer in front of queue */
1173 __skb_queue_head(&head, skb);
1174 tipc_node_unlock(n_ptr);
1175 continue;
1176 }
1177 goto unlock_discard;
1178 }
1179
1180 /* Link is now in state WORKING_WORKING */
1181 if (unlikely(seq_no != mod(l_ptr->next_in_no))) {
1182 link_handle_out_of_seq_msg(l_ptr, skb);
1183 link_retrieve_defq(l_ptr, &head);
1184 tipc_node_unlock(n_ptr);
1185 continue;
1186 }
1187 l_ptr->next_in_no++;
1188 if (unlikely(!skb_queue_empty(&l_ptr->deferred_queue)))
1189 link_retrieve_defq(l_ptr, &head);
1190
1191 if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
1192 l_ptr->stats.sent_acks++;
1193 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
1194 }
1195
1196 if (tipc_link_prepare_input(l_ptr, &skb)) {
1197 tipc_node_unlock(n_ptr);
1198 continue;
1199 }
1200 tipc_node_unlock(n_ptr);
1201
1202 if (tipc_link_input(l_ptr, skb) != 0)
1203 goto discard;
1204 continue;
1205 unlock_discard:
1206 tipc_node_unlock(n_ptr);
1207 discard:
1208 kfree_skb(skb);
1209 }
1210 }
1211
1212 /**
1213 * tipc_link_prepare_input - process TIPC link messages
1214 *
1215 * returns nonzero if the message was consumed
1216 *
1217 * Node lock must be held
1218 */
1219 static int tipc_link_prepare_input(struct tipc_link *l, struct sk_buff **buf)
1220 {
1221 struct tipc_node *n;
1222 struct tipc_msg *msg;
1223 int res = -EINVAL;
1224
1225 n = l->owner;
1226 msg = buf_msg(*buf);
1227 switch (msg_user(msg)) {
1228 case CHANGEOVER_PROTOCOL:
1229 if (tipc_link_tunnel_rcv(n, buf))
1230 res = 0;
1231 break;
1232 case MSG_FRAGMENTER:
1233 l->stats.recv_fragments++;
1234 if (tipc_buf_append(&l->reasm_buf, buf)) {
1235 l->stats.recv_fragmented++;
1236 res = 0;
1237 } else if (!l->reasm_buf) {
1238 tipc_link_reset(l);
1239 }
1240 break;
1241 case MSG_BUNDLER:
1242 l->stats.recv_bundles++;
1243 l->stats.recv_bundled += msg_msgcnt(msg);
1244 res = 0;
1245 break;
1246 case NAME_DISTRIBUTOR:
1247 n->bclink.recv_permitted = true;
1248 res = 0;
1249 break;
1250 case BCAST_PROTOCOL:
1251 tipc_link_sync_rcv(n, *buf);
1252 break;
1253 default:
1254 res = 0;
1255 }
1256 return res;
1257 }
1258 /**
1259 * tipc_link_input - Deliver message too higher layers
1260 */
1261 static int tipc_link_input(struct tipc_link *l, struct sk_buff *buf)
1262 {
1263 struct tipc_msg *msg = buf_msg(buf);
1264 int res = 0;
1265
1266 switch (msg_user(msg)) {
1267 case TIPC_LOW_IMPORTANCE:
1268 case TIPC_MEDIUM_IMPORTANCE:
1269 case TIPC_HIGH_IMPORTANCE:
1270 case TIPC_CRITICAL_IMPORTANCE:
1271 case CONN_MANAGER:
1272 tipc_sk_rcv(buf);
1273 break;
1274 case NAME_DISTRIBUTOR:
1275 tipc_named_rcv(buf);
1276 break;
1277 case MSG_BUNDLER:
1278 tipc_link_bundle_rcv(buf);
1279 break;
1280 default:
1281 res = -EINVAL;
1282 }
1283 return res;
1284 }
1285
1286 /**
1287 * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue
1288 *
1289 * Returns increase in queue length (i.e. 0 or 1)
1290 */
1291 u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb)
1292 {
1293 struct sk_buff *skb1;
1294 u32 seq_no = buf_seqno(skb);
1295
1296 /* Empty queue ? */
1297 if (skb_queue_empty(list)) {
1298 __skb_queue_tail(list, skb);
1299 return 1;
1300 }
1301
1302 /* Last ? */
1303 if (less(buf_seqno(skb_peek_tail(list)), seq_no)) {
1304 __skb_queue_tail(list, skb);
1305 return 1;
1306 }
1307
1308 /* Locate insertion point in queue, then insert; discard if duplicate */
1309 skb_queue_walk(list, skb1) {
1310 u32 curr_seqno = buf_seqno(skb1);
1311
1312 if (seq_no == curr_seqno) {
1313 kfree_skb(skb);
1314 return 0;
1315 }
1316
1317 if (less(seq_no, curr_seqno))
1318 break;
1319 }
1320
1321 __skb_queue_before(list, skb1, skb);
1322 return 1;
1323 }
1324
1325 /*
1326 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
1327 */
1328 static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
1329 struct sk_buff *buf)
1330 {
1331 u32 seq_no = buf_seqno(buf);
1332
1333 if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
1334 tipc_link_proto_rcv(l_ptr, buf);
1335 return;
1336 }
1337
1338 /* Record OOS packet arrival (force mismatch on next timeout) */
1339 l_ptr->checkpoint--;
1340
1341 /*
1342 * Discard packet if a duplicate; otherwise add it to deferred queue
1343 * and notify peer of gap as per protocol specification
1344 */
1345 if (less(seq_no, mod(l_ptr->next_in_no))) {
1346 l_ptr->stats.duplicates++;
1347 kfree_skb(buf);
1348 return;
1349 }
1350
1351 if (tipc_link_defer_pkt(&l_ptr->deferred_queue, buf)) {
1352 l_ptr->stats.deferred_recv++;
1353 TIPC_SKB_CB(buf)->deferred = true;
1354 if ((skb_queue_len(&l_ptr->deferred_queue) % 16) == 1)
1355 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
1356 } else {
1357 l_ptr->stats.duplicates++;
1358 }
1359 }
1360
1361 /*
1362 * Send protocol message to the other endpoint.
1363 */
1364 void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
1365 u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
1366 {
1367 struct sk_buff *buf = NULL;
1368 struct tipc_msg *msg = l_ptr->pmsg;
1369 u32 msg_size = sizeof(l_ptr->proto_msg);
1370 int r_flag;
1371
1372 /* Don't send protocol message during link changeover */
1373 if (l_ptr->exp_msg_count)
1374 return;
1375
1376 /* Abort non-RESET send if communication with node is prohibited */
1377 if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG))
1378 return;
1379
1380 /* Create protocol message with "out-of-sequence" sequence number */
1381 msg_set_type(msg, msg_typ);
1382 msg_set_net_plane(msg, l_ptr->net_plane);
1383 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1384 msg_set_last_bcast(msg, tipc_bclink_get_last_sent());
1385
1386 if (msg_typ == STATE_MSG) {
1387 u32 next_sent = mod(l_ptr->next_out_no);
1388
1389 if (!tipc_link_is_up(l_ptr))
1390 return;
1391 if (l_ptr->next_out)
1392 next_sent = buf_seqno(l_ptr->next_out);
1393 msg_set_next_sent(msg, next_sent);
1394 if (!skb_queue_empty(&l_ptr->deferred_queue)) {
1395 u32 rec = buf_seqno(skb_peek(&l_ptr->deferred_queue));
1396 gap = mod(rec - mod(l_ptr->next_in_no));
1397 }
1398 msg_set_seq_gap(msg, gap);
1399 if (gap)
1400 l_ptr->stats.sent_nacks++;
1401 msg_set_link_tolerance(msg, tolerance);
1402 msg_set_linkprio(msg, priority);
1403 msg_set_max_pkt(msg, ack_mtu);
1404 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1405 msg_set_probe(msg, probe_msg != 0);
1406 if (probe_msg) {
1407 u32 mtu = l_ptr->max_pkt;
1408
1409 if ((mtu < l_ptr->max_pkt_target) &&
1410 link_working_working(l_ptr) &&
1411 l_ptr->fsm_msg_cnt) {
1412 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
1413 if (l_ptr->max_pkt_probes == 10) {
1414 l_ptr->max_pkt_target = (msg_size - 4);
1415 l_ptr->max_pkt_probes = 0;
1416 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
1417 }
1418 l_ptr->max_pkt_probes++;
1419 }
1420
1421 l_ptr->stats.sent_probes++;
1422 }
1423 l_ptr->stats.sent_states++;
1424 } else { /* RESET_MSG or ACTIVATE_MSG */
1425 msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
1426 msg_set_seq_gap(msg, 0);
1427 msg_set_next_sent(msg, 1);
1428 msg_set_probe(msg, 0);
1429 msg_set_link_tolerance(msg, l_ptr->tolerance);
1430 msg_set_linkprio(msg, l_ptr->priority);
1431 msg_set_max_pkt(msg, l_ptr->max_pkt_target);
1432 }
1433
1434 r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr));
1435 msg_set_redundant_link(msg, r_flag);
1436 msg_set_linkprio(msg, l_ptr->priority);
1437 msg_set_size(msg, msg_size);
1438
1439 msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
1440
1441 buf = tipc_buf_acquire(msg_size);
1442 if (!buf)
1443 return;
1444
1445 skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
1446 buf->priority = TC_PRIO_CONTROL;
1447
1448 tipc_bearer_send(l_ptr->bearer_id, buf, &l_ptr->media_addr);
1449 l_ptr->unacked_window = 0;
1450 kfree_skb(buf);
1451 }
1452
1453 /*
1454 * Receive protocol message :
1455 * Note that network plane id propagates through the network, and may
1456 * change at any time. The node with lowest address rules
1457 */
1458 static void tipc_link_proto_rcv(struct tipc_link *l_ptr, struct sk_buff *buf)
1459 {
1460 u32 rec_gap = 0;
1461 u32 max_pkt_info;
1462 u32 max_pkt_ack;
1463 u32 msg_tol;
1464 struct tipc_msg *msg = buf_msg(buf);
1465
1466 /* Discard protocol message during link changeover */
1467 if (l_ptr->exp_msg_count)
1468 goto exit;
1469
1470 if (l_ptr->net_plane != msg_net_plane(msg))
1471 if (tipc_own_addr > msg_prevnode(msg))
1472 l_ptr->net_plane = msg_net_plane(msg);
1473
1474 switch (msg_type(msg)) {
1475
1476 case RESET_MSG:
1477 if (!link_working_unknown(l_ptr) &&
1478 (l_ptr->peer_session != INVALID_SESSION)) {
1479 if (less_eq(msg_session(msg), l_ptr->peer_session))
1480 break; /* duplicate or old reset: ignore */
1481 }
1482
1483 if (!msg_redundant_link(msg) && (link_working_working(l_ptr) ||
1484 link_working_unknown(l_ptr))) {
1485 /*
1486 * peer has lost contact -- don't allow peer's links
1487 * to reactivate before we recognize loss & clean up
1488 */
1489 l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN;
1490 }
1491
1492 link_state_event(l_ptr, RESET_MSG);
1493
1494 /* fall thru' */
1495 case ACTIVATE_MSG:
1496 /* Update link settings according other endpoint's values */
1497 strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
1498
1499 msg_tol = msg_link_tolerance(msg);
1500 if (msg_tol > l_ptr->tolerance)
1501 link_set_supervision_props(l_ptr, msg_tol);
1502
1503 if (msg_linkprio(msg) > l_ptr->priority)
1504 l_ptr->priority = msg_linkprio(msg);
1505
1506 max_pkt_info = msg_max_pkt(msg);
1507 if (max_pkt_info) {
1508 if (max_pkt_info < l_ptr->max_pkt_target)
1509 l_ptr->max_pkt_target = max_pkt_info;
1510 if (l_ptr->max_pkt > l_ptr->max_pkt_target)
1511 l_ptr->max_pkt = l_ptr->max_pkt_target;
1512 } else {
1513 l_ptr->max_pkt = l_ptr->max_pkt_target;
1514 }
1515
1516 /* Synchronize broadcast link info, if not done previously */
1517 if (!tipc_node_is_up(l_ptr->owner)) {
1518 l_ptr->owner->bclink.last_sent =
1519 l_ptr->owner->bclink.last_in =
1520 msg_last_bcast(msg);
1521 l_ptr->owner->bclink.oos_state = 0;
1522 }
1523
1524 l_ptr->peer_session = msg_session(msg);
1525 l_ptr->peer_bearer_id = msg_bearer_id(msg);
1526
1527 if (msg_type(msg) == ACTIVATE_MSG)
1528 link_state_event(l_ptr, ACTIVATE_MSG);
1529 break;
1530 case STATE_MSG:
1531
1532 msg_tol = msg_link_tolerance(msg);
1533 if (msg_tol)
1534 link_set_supervision_props(l_ptr, msg_tol);
1535
1536 if (msg_linkprio(msg) &&
1537 (msg_linkprio(msg) != l_ptr->priority)) {
1538 pr_warn("%s<%s>, priority change %u->%u\n",
1539 link_rst_msg, l_ptr->name, l_ptr->priority,
1540 msg_linkprio(msg));
1541 l_ptr->priority = msg_linkprio(msg);
1542 tipc_link_reset(l_ptr); /* Enforce change to take effect */
1543 break;
1544 }
1545
1546 /* Record reception; force mismatch at next timeout: */
1547 l_ptr->checkpoint--;
1548
1549 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1550 l_ptr->stats.recv_states++;
1551 if (link_reset_unknown(l_ptr))
1552 break;
1553
1554 if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
1555 rec_gap = mod(msg_next_sent(msg) -
1556 mod(l_ptr->next_in_no));
1557 }
1558
1559 max_pkt_ack = msg_max_pkt(msg);
1560 if (max_pkt_ack > l_ptr->max_pkt) {
1561 l_ptr->max_pkt = max_pkt_ack;
1562 l_ptr->max_pkt_probes = 0;
1563 }
1564
1565 max_pkt_ack = 0;
1566 if (msg_probe(msg)) {
1567 l_ptr->stats.recv_probes++;
1568 if (msg_size(msg) > sizeof(l_ptr->proto_msg))
1569 max_pkt_ack = msg_size(msg);
1570 }
1571
1572 /* Protocol message before retransmits, reduce loss risk */
1573 if (l_ptr->owner->bclink.recv_permitted)
1574 tipc_bclink_update_link_state(l_ptr->owner,
1575 msg_last_bcast(msg));
1576
1577 if (rec_gap || (msg_probe(msg))) {
1578 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, rec_gap, 0,
1579 0, max_pkt_ack);
1580 }
1581 if (msg_seq_gap(msg)) {
1582 l_ptr->stats.recv_nacks++;
1583 tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->outqueue),
1584 msg_seq_gap(msg));
1585 }
1586 break;
1587 }
1588 exit:
1589 kfree_skb(buf);
1590 }
1591
1592
1593 /* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to
1594 * a different bearer. Owner node is locked.
1595 */
1596 static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr,
1597 struct tipc_msg *tunnel_hdr,
1598 struct tipc_msg *msg,
1599 u32 selector)
1600 {
1601 struct tipc_link *tunnel;
1602 struct sk_buff *skb;
1603 u32 length = msg_size(msg);
1604
1605 tunnel = l_ptr->owner->active_links[selector & 1];
1606 if (!tipc_link_is_up(tunnel)) {
1607 pr_warn("%stunnel link no longer available\n", link_co_err);
1608 return;
1609 }
1610 msg_set_size(tunnel_hdr, length + INT_H_SIZE);
1611 skb = tipc_buf_acquire(length + INT_H_SIZE);
1612 if (!skb) {
1613 pr_warn("%sunable to send tunnel msg\n", link_co_err);
1614 return;
1615 }
1616 skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE);
1617 skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length);
1618 __tipc_link_xmit_skb(tunnel, skb);
1619 }
1620
1621
1622 /* tipc_link_failover_send_queue(): A link has gone down, but a second
1623 * link is still active. We can do failover. Tunnel the failing link's
1624 * whole send queue via the remaining link. This way, we don't lose
1625 * any packets, and sequence order is preserved for subsequent traffic
1626 * sent over the remaining link. Owner node is locked.
1627 */
1628 void tipc_link_failover_send_queue(struct tipc_link *l_ptr)
1629 {
1630 u32 msgcount = skb_queue_len(&l_ptr->outqueue);
1631 struct tipc_link *tunnel = l_ptr->owner->active_links[0];
1632 struct tipc_msg tunnel_hdr;
1633 struct sk_buff *skb;
1634 int split_bundles;
1635
1636 if (!tunnel)
1637 return;
1638
1639 tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
1640 ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr);
1641 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
1642 msg_set_msgcnt(&tunnel_hdr, msgcount);
1643
1644 if (skb_queue_empty(&l_ptr->outqueue)) {
1645 skb = tipc_buf_acquire(INT_H_SIZE);
1646 if (skb) {
1647 skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE);
1648 msg_set_size(&tunnel_hdr, INT_H_SIZE);
1649 __tipc_link_xmit_skb(tunnel, skb);
1650 } else {
1651 pr_warn("%sunable to send changeover msg\n",
1652 link_co_err);
1653 }
1654 return;
1655 }
1656
1657 split_bundles = (l_ptr->owner->active_links[0] !=
1658 l_ptr->owner->active_links[1]);
1659
1660 skb_queue_walk(&l_ptr->outqueue, skb) {
1661 struct tipc_msg *msg = buf_msg(skb);
1662
1663 if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
1664 struct tipc_msg *m = msg_get_wrapped(msg);
1665 unchar *pos = (unchar *)m;
1666
1667 msgcount = msg_msgcnt(msg);
1668 while (msgcount--) {
1669 msg_set_seqno(m, msg_seqno(msg));
1670 tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m,
1671 msg_link_selector(m));
1672 pos += align(msg_size(m));
1673 m = (struct tipc_msg *)pos;
1674 }
1675 } else {
1676 tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg,
1677 msg_link_selector(msg));
1678 }
1679 }
1680 }
1681
1682 /* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a
1683 * duplicate of the first link's send queue via the new link. This way, we
1684 * are guaranteed that currently queued packets from a socket are delivered
1685 * before future traffic from the same socket, even if this is using the
1686 * new link. The last arriving copy of each duplicate packet is dropped at
1687 * the receiving end by the regular protocol check, so packet cardinality
1688 * and sequence order is preserved per sender/receiver socket pair.
1689 * Owner node is locked.
1690 */
1691 void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr,
1692 struct tipc_link *tunnel)
1693 {
1694 struct sk_buff *skb;
1695 struct tipc_msg tunnel_hdr;
1696
1697 tipc_msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
1698 DUPLICATE_MSG, INT_H_SIZE, l_ptr->addr);
1699 msg_set_msgcnt(&tunnel_hdr, skb_queue_len(&l_ptr->outqueue));
1700 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
1701 skb_queue_walk(&l_ptr->outqueue, skb) {
1702 struct sk_buff *outskb;
1703 struct tipc_msg *msg = buf_msg(skb);
1704 u32 length = msg_size(msg);
1705
1706 if (msg_user(msg) == MSG_BUNDLER)
1707 msg_set_type(msg, CLOSED_MSG);
1708 msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
1709 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1710 msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
1711 outskb = tipc_buf_acquire(length + INT_H_SIZE);
1712 if (outskb == NULL) {
1713 pr_warn("%sunable to send duplicate msg\n",
1714 link_co_err);
1715 return;
1716 }
1717 skb_copy_to_linear_data(outskb, &tunnel_hdr, INT_H_SIZE);
1718 skb_copy_to_linear_data_offset(outskb, INT_H_SIZE, skb->data,
1719 length);
1720 __tipc_link_xmit_skb(tunnel, outskb);
1721 if (!tipc_link_is_up(l_ptr))
1722 return;
1723 }
1724 }
1725
1726 /**
1727 * buf_extract - extracts embedded TIPC message from another message
1728 * @skb: encapsulating message buffer
1729 * @from_pos: offset to extract from
1730 *
1731 * Returns a new message buffer containing an embedded message. The
1732 * encapsulating message itself is left unchanged.
1733 */
1734 static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
1735 {
1736 struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
1737 u32 size = msg_size(msg);
1738 struct sk_buff *eb;
1739
1740 eb = tipc_buf_acquire(size);
1741 if (eb)
1742 skb_copy_to_linear_data(eb, msg, size);
1743 return eb;
1744 }
1745
1746
1747
1748 /* tipc_link_dup_rcv(): Receive a tunnelled DUPLICATE_MSG packet.
1749 * Owner node is locked.
1750 */
1751 static void tipc_link_dup_rcv(struct tipc_link *l_ptr,
1752 struct sk_buff *t_buf)
1753 {
1754 struct sk_buff *buf;
1755
1756 if (!tipc_link_is_up(l_ptr))
1757 return;
1758
1759 buf = buf_extract(t_buf, INT_H_SIZE);
1760 if (buf == NULL) {
1761 pr_warn("%sfailed to extract inner dup pkt\n", link_co_err);
1762 return;
1763 }
1764
1765 /* Add buffer to deferred queue, if applicable: */
1766 link_handle_out_of_seq_msg(l_ptr, buf);
1767 }
1768
1769 /* tipc_link_failover_rcv(): Receive a tunnelled ORIGINAL_MSG packet
1770 * Owner node is locked.
1771 */
1772 static struct sk_buff *tipc_link_failover_rcv(struct tipc_link *l_ptr,
1773 struct sk_buff *t_buf)
1774 {
1775 struct tipc_msg *t_msg = buf_msg(t_buf);
1776 struct sk_buff *buf = NULL;
1777 struct tipc_msg *msg;
1778
1779 if (tipc_link_is_up(l_ptr))
1780 tipc_link_reset(l_ptr);
1781
1782 /* First failover packet? */
1783 if (l_ptr->exp_msg_count == START_CHANGEOVER)
1784 l_ptr->exp_msg_count = msg_msgcnt(t_msg);
1785
1786 /* Should there be an inner packet? */
1787 if (l_ptr->exp_msg_count) {
1788 l_ptr->exp_msg_count--;
1789 buf = buf_extract(t_buf, INT_H_SIZE);
1790 if (buf == NULL) {
1791 pr_warn("%sno inner failover pkt\n", link_co_err);
1792 goto exit;
1793 }
1794 msg = buf_msg(buf);
1795
1796 if (less(msg_seqno(msg), l_ptr->reset_checkpoint)) {
1797 kfree_skb(buf);
1798 buf = NULL;
1799 goto exit;
1800 }
1801 if (msg_user(msg) == MSG_FRAGMENTER) {
1802 l_ptr->stats.recv_fragments++;
1803 tipc_buf_append(&l_ptr->reasm_buf, &buf);
1804 }
1805 }
1806 exit:
1807 if ((l_ptr->exp_msg_count == 0) && (l_ptr->flags & LINK_STOPPED)) {
1808 tipc_node_detach_link(l_ptr->owner, l_ptr);
1809 kfree(l_ptr);
1810 }
1811 return buf;
1812 }
1813
1814 /* tipc_link_tunnel_rcv(): Receive a tunnelled packet, sent
1815 * via other link as result of a failover (ORIGINAL_MSG) or
1816 * a new active link (DUPLICATE_MSG). Failover packets are
1817 * returned to the active link for delivery upwards.
1818 * Owner node is locked.
1819 */
1820 static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr,
1821 struct sk_buff **buf)
1822 {
1823 struct sk_buff *t_buf = *buf;
1824 struct tipc_link *l_ptr;
1825 struct tipc_msg *t_msg = buf_msg(t_buf);
1826 u32 bearer_id = msg_bearer_id(t_msg);
1827
1828 *buf = NULL;
1829
1830 if (bearer_id >= MAX_BEARERS)
1831 goto exit;
1832
1833 l_ptr = n_ptr->links[bearer_id];
1834 if (!l_ptr)
1835 goto exit;
1836
1837 if (msg_type(t_msg) == DUPLICATE_MSG)
1838 tipc_link_dup_rcv(l_ptr, t_buf);
1839 else if (msg_type(t_msg) == ORIGINAL_MSG)
1840 *buf = tipc_link_failover_rcv(l_ptr, t_buf);
1841 else
1842 pr_warn("%sunknown tunnel pkt received\n", link_co_err);
1843 exit:
1844 kfree_skb(t_buf);
1845 return *buf != NULL;
1846 }
1847
1848 /*
1849 * Bundler functionality:
1850 */
1851 void tipc_link_bundle_rcv(struct sk_buff *buf)
1852 {
1853 u32 msgcount = msg_msgcnt(buf_msg(buf));
1854 u32 pos = INT_H_SIZE;
1855 struct sk_buff *obuf;
1856 struct tipc_msg *omsg;
1857
1858 while (msgcount--) {
1859 obuf = buf_extract(buf, pos);
1860 if (obuf == NULL) {
1861 pr_warn("Link unable to unbundle message(s)\n");
1862 break;
1863 }
1864 omsg = buf_msg(obuf);
1865 pos += align(msg_size(omsg));
1866 if (msg_isdata(omsg)) {
1867 if (unlikely(msg_type(omsg) == TIPC_MCAST_MSG))
1868 tipc_sk_mcast_rcv(obuf);
1869 else
1870 tipc_sk_rcv(obuf);
1871 } else if (msg_user(omsg) == CONN_MANAGER) {
1872 tipc_sk_rcv(obuf);
1873 } else if (msg_user(omsg) == NAME_DISTRIBUTOR) {
1874 tipc_named_rcv(obuf);
1875 } else {
1876 pr_warn("Illegal bundled msg: %u\n", msg_user(omsg));
1877 kfree_skb(obuf);
1878 }
1879 }
1880 kfree_skb(buf);
1881 }
1882
1883 static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tolerance)
1884 {
1885 if ((tolerance < TIPC_MIN_LINK_TOL) || (tolerance > TIPC_MAX_LINK_TOL))
1886 return;
1887
1888 l_ptr->tolerance = tolerance;
1889 l_ptr->continuity_interval =
1890 ((tolerance / 4) > 500) ? 500 : tolerance / 4;
1891 l_ptr->abort_limit = tolerance / (l_ptr->continuity_interval / 4);
1892 }
1893
1894 void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window)
1895 {
1896 /* Data messages from this node, inclusive FIRST_FRAGM */
1897 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE] = window;
1898 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE] = (window / 3) * 4;
1899 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE] = (window / 3) * 5;
1900 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE] = (window / 3) * 6;
1901 /* Transiting data messages,inclusive FIRST_FRAGM */
1902 l_ptr->queue_limit[TIPC_LOW_IMPORTANCE + 4] = 300;
1903 l_ptr->queue_limit[TIPC_MEDIUM_IMPORTANCE + 4] = 600;
1904 l_ptr->queue_limit[TIPC_HIGH_IMPORTANCE + 4] = 900;
1905 l_ptr->queue_limit[TIPC_CRITICAL_IMPORTANCE + 4] = 1200;
1906 l_ptr->queue_limit[CONN_MANAGER] = 1200;
1907 l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
1908 l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
1909 /* FRAGMENT and LAST_FRAGMENT packets */
1910 l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
1911 }
1912
1913 /* tipc_link_find_owner - locate owner node of link by link's name
1914 * @name: pointer to link name string
1915 * @bearer_id: pointer to index in 'node->links' array where the link was found.
1916 *
1917 * Returns pointer to node owning the link, or 0 if no matching link is found.
1918 */
1919 static struct tipc_node *tipc_link_find_owner(const char *link_name,
1920 unsigned int *bearer_id)
1921 {
1922 struct tipc_link *l_ptr;
1923 struct tipc_node *n_ptr;
1924 struct tipc_node *found_node = 0;
1925 int i;
1926
1927 *bearer_id = 0;
1928 rcu_read_lock();
1929 list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
1930 tipc_node_lock(n_ptr);
1931 for (i = 0; i < MAX_BEARERS; i++) {
1932 l_ptr = n_ptr->links[i];
1933 if (l_ptr && !strcmp(l_ptr->name, link_name)) {
1934 *bearer_id = i;
1935 found_node = n_ptr;
1936 break;
1937 }
1938 }
1939 tipc_node_unlock(n_ptr);
1940 if (found_node)
1941 break;
1942 }
1943 rcu_read_unlock();
1944
1945 return found_node;
1946 }
1947
1948 /**
1949 * link_value_is_valid -- validate proposed link tolerance/priority/window
1950 *
1951 * @cmd: value type (TIPC_CMD_SET_LINK_*)
1952 * @new_value: the new value
1953 *
1954 * Returns 1 if value is within range, 0 if not.
1955 */
1956 static int link_value_is_valid(u16 cmd, u32 new_value)
1957 {
1958 switch (cmd) {
1959 case TIPC_CMD_SET_LINK_TOL:
1960 return (new_value >= TIPC_MIN_LINK_TOL) &&
1961 (new_value <= TIPC_MAX_LINK_TOL);
1962 case TIPC_CMD_SET_LINK_PRI:
1963 return (new_value <= TIPC_MAX_LINK_PRI);
1964 case TIPC_CMD_SET_LINK_WINDOW:
1965 return (new_value >= TIPC_MIN_LINK_WIN) &&
1966 (new_value <= TIPC_MAX_LINK_WIN);
1967 }
1968 return 0;
1969 }
1970
1971 /**
1972 * link_cmd_set_value - change priority/tolerance/window for link/bearer/media
1973 * @name: ptr to link, bearer, or media name
1974 * @new_value: new value of link, bearer, or media setting
1975 * @cmd: which link, bearer, or media attribute to set (TIPC_CMD_SET_LINK_*)
1976 *
1977 * Caller must hold RTNL lock to ensure link/bearer/media is not deleted.
1978 *
1979 * Returns 0 if value updated and negative value on error.
1980 */
1981 static int link_cmd_set_value(const char *name, u32 new_value, u16 cmd)
1982 {
1983 struct tipc_node *node;
1984 struct tipc_link *l_ptr;
1985 struct tipc_bearer *b_ptr;
1986 struct tipc_media *m_ptr;
1987 int bearer_id;
1988 int res = 0;
1989
1990 node = tipc_link_find_owner(name, &bearer_id);
1991 if (node) {
1992 tipc_node_lock(node);
1993 l_ptr = node->links[bearer_id];
1994
1995 if (l_ptr) {
1996 switch (cmd) {
1997 case TIPC_CMD_SET_LINK_TOL:
1998 link_set_supervision_props(l_ptr, new_value);
1999 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0,
2000 new_value, 0, 0);
2001 break;
2002 case TIPC_CMD_SET_LINK_PRI:
2003 l_ptr->priority = new_value;
2004 tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0,
2005 0, new_value, 0);
2006 break;
2007 case TIPC_CMD_SET_LINK_WINDOW:
2008 tipc_link_set_queue_limits(l_ptr, new_value);
2009 break;
2010 default:
2011 res = -EINVAL;
2012 break;
2013 }
2014 }
2015 tipc_node_unlock(node);
2016 return res;
2017 }
2018
2019 b_ptr = tipc_bearer_find(name);
2020 if (b_ptr) {
2021 switch (cmd) {
2022 case TIPC_CMD_SET_LINK_TOL:
2023 b_ptr->tolerance = new_value;
2024 break;
2025 case TIPC_CMD_SET_LINK_PRI:
2026 b_ptr->priority = new_value;
2027 break;
2028 case TIPC_CMD_SET_LINK_WINDOW:
2029 b_ptr->window = new_value;
2030 break;
2031 default:
2032 res = -EINVAL;
2033 break;
2034 }
2035 return res;
2036 }
2037
2038 m_ptr = tipc_media_find(name);
2039 if (!m_ptr)
2040 return -ENODEV;
2041 switch (cmd) {
2042 case TIPC_CMD_SET_LINK_TOL:
2043 m_ptr->tolerance = new_value;
2044 break;
2045 case TIPC_CMD_SET_LINK_PRI:
2046 m_ptr->priority = new_value;
2047 break;
2048 case TIPC_CMD_SET_LINK_WINDOW:
2049 m_ptr->window = new_value;
2050 break;
2051 default:
2052 res = -EINVAL;
2053 break;
2054 }
2055 return res;
2056 }
2057
2058 struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space,
2059 u16 cmd)
2060 {
2061 struct tipc_link_config *args;
2062 u32 new_value;
2063 int res;
2064
2065 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
2066 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
2067
2068 args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
2069 new_value = ntohl(args->value);
2070
2071 if (!link_value_is_valid(cmd, new_value))
2072 return tipc_cfg_reply_error_string(
2073 "cannot change, value invalid");
2074
2075 if (!strcmp(args->name, tipc_bclink_name)) {
2076 if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
2077 (tipc_bclink_set_queue_limits(new_value) == 0))
2078 return tipc_cfg_reply_none();
2079 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
2080 " (cannot change setting on broadcast link)");
2081 }
2082
2083 res = link_cmd_set_value(args->name, new_value, cmd);
2084 if (res)
2085 return tipc_cfg_reply_error_string("cannot change link setting");
2086
2087 return tipc_cfg_reply_none();
2088 }
2089
2090 /**
2091 * link_reset_statistics - reset link statistics
2092 * @l_ptr: pointer to link
2093 */
2094 static void link_reset_statistics(struct tipc_link *l_ptr)
2095 {
2096 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
2097 l_ptr->stats.sent_info = l_ptr->next_out_no;
2098 l_ptr->stats.recv_info = l_ptr->next_in_no;
2099 }
2100
2101 struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space)
2102 {
2103 char *link_name;
2104 struct tipc_link *l_ptr;
2105 struct tipc_node *node;
2106 unsigned int bearer_id;
2107
2108 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
2109 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
2110
2111 link_name = (char *)TLV_DATA(req_tlv_area);
2112 if (!strcmp(link_name, tipc_bclink_name)) {
2113 if (tipc_bclink_reset_stats())
2114 return tipc_cfg_reply_error_string("link not found");
2115 return tipc_cfg_reply_none();
2116 }
2117 node = tipc_link_find_owner(link_name, &bearer_id);
2118 if (!node)
2119 return tipc_cfg_reply_error_string("link not found");
2120
2121 tipc_node_lock(node);
2122 l_ptr = node->links[bearer_id];
2123 if (!l_ptr) {
2124 tipc_node_unlock(node);
2125 return tipc_cfg_reply_error_string("link not found");
2126 }
2127 link_reset_statistics(l_ptr);
2128 tipc_node_unlock(node);
2129 return tipc_cfg_reply_none();
2130 }
2131
2132 /**
2133 * percent - convert count to a percentage of total (rounding up or down)
2134 */
2135 static u32 percent(u32 count, u32 total)
2136 {
2137 return (count * 100 + (total / 2)) / total;
2138 }
2139
2140 /**
2141 * tipc_link_stats - print link statistics
2142 * @name: link name
2143 * @buf: print buffer area
2144 * @buf_size: size of print buffer area
2145 *
2146 * Returns length of print buffer data string (or 0 if error)
2147 */
2148 static int tipc_link_stats(const char *name, char *buf, const u32 buf_size)
2149 {
2150 struct tipc_link *l;
2151 struct tipc_stats *s;
2152 struct tipc_node *node;
2153 char *status;
2154 u32 profile_total = 0;
2155 unsigned int bearer_id;
2156 int ret;
2157
2158 if (!strcmp(name, tipc_bclink_name))
2159 return tipc_bclink_stats(buf, buf_size);
2160
2161 node = tipc_link_find_owner(name, &bearer_id);
2162 if (!node)
2163 return 0;
2164
2165 tipc_node_lock(node);
2166
2167 l = node->links[bearer_id];
2168 if (!l) {
2169 tipc_node_unlock(node);
2170 return 0;
2171 }
2172
2173 s = &l->stats;
2174
2175 if (tipc_link_is_active(l))
2176 status = "ACTIVE";
2177 else if (tipc_link_is_up(l))
2178 status = "STANDBY";
2179 else
2180 status = "DEFUNCT";
2181
2182 ret = tipc_snprintf(buf, buf_size, "Link <%s>\n"
2183 " %s MTU:%u Priority:%u Tolerance:%u ms"
2184 " Window:%u packets\n",
2185 l->name, status, l->max_pkt, l->priority,
2186 l->tolerance, l->queue_limit[0]);
2187
2188 ret += tipc_snprintf(buf + ret, buf_size - ret,
2189 " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
2190 l->next_in_no - s->recv_info, s->recv_fragments,
2191 s->recv_fragmented, s->recv_bundles,
2192 s->recv_bundled);
2193
2194 ret += tipc_snprintf(buf + ret, buf_size - ret,
2195 " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
2196 l->next_out_no - s->sent_info, s->sent_fragments,
2197 s->sent_fragmented, s->sent_bundles,
2198 s->sent_bundled);
2199
2200 profile_total = s->msg_length_counts;
2201 if (!profile_total)
2202 profile_total = 1;
2203
2204 ret += tipc_snprintf(buf + ret, buf_size - ret,
2205 " TX profile sample:%u packets average:%u octets\n"
2206 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
2207 "-16384:%u%% -32768:%u%% -66000:%u%%\n",
2208 s->msg_length_counts,
2209 s->msg_lengths_total / profile_total,
2210 percent(s->msg_length_profile[0], profile_total),
2211 percent(s->msg_length_profile[1], profile_total),
2212 percent(s->msg_length_profile[2], profile_total),
2213 percent(s->msg_length_profile[3], profile_total),
2214 percent(s->msg_length_profile[4], profile_total),
2215 percent(s->msg_length_profile[5], profile_total),
2216 percent(s->msg_length_profile[6], profile_total));
2217
2218 ret += tipc_snprintf(buf + ret, buf_size - ret,
2219 " RX states:%u probes:%u naks:%u defs:%u"
2220 " dups:%u\n", s->recv_states, s->recv_probes,
2221 s->recv_nacks, s->deferred_recv, s->duplicates);
2222
2223 ret += tipc_snprintf(buf + ret, buf_size - ret,
2224 " TX states:%u probes:%u naks:%u acks:%u"
2225 " dups:%u\n", s->sent_states, s->sent_probes,
2226 s->sent_nacks, s->sent_acks, s->retransmitted);
2227
2228 ret += tipc_snprintf(buf + ret, buf_size - ret,
2229 " Congestion link:%u Send queue"
2230 " max:%u avg:%u\n", s->link_congs,
2231 s->max_queue_sz, s->queue_sz_counts ?
2232 (s->accu_queue_sz / s->queue_sz_counts) : 0);
2233
2234 tipc_node_unlock(node);
2235 return ret;
2236 }
2237
2238 struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space)
2239 {
2240 struct sk_buff *buf;
2241 struct tlv_desc *rep_tlv;
2242 int str_len;
2243 int pb_len;
2244 char *pb;
2245
2246 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
2247 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
2248
2249 buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
2250 if (!buf)
2251 return NULL;
2252
2253 rep_tlv = (struct tlv_desc *)buf->data;
2254 pb = TLV_DATA(rep_tlv);
2255 pb_len = ULTRA_STRING_MAX_LEN;
2256 str_len = tipc_link_stats((char *)TLV_DATA(req_tlv_area),
2257 pb, pb_len);
2258 if (!str_len) {
2259 kfree_skb(buf);
2260 return tipc_cfg_reply_error_string("link not found");
2261 }
2262 str_len += 1; /* for "\0" */
2263 skb_put(buf, TLV_SPACE(str_len));
2264 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
2265
2266 return buf;
2267 }
2268
2269 /**
2270 * tipc_link_get_max_pkt - get maximum packet size to use when sending to destination
2271 * @dest: network address of destination node
2272 * @selector: used to select from set of active links
2273 *
2274 * If no active link can be found, uses default maximum packet size.
2275 */
2276 u32 tipc_link_get_max_pkt(u32 dest, u32 selector)
2277 {
2278 struct tipc_node *n_ptr;
2279 struct tipc_link *l_ptr;
2280 u32 res = MAX_PKT_DEFAULT;
2281
2282 if (dest == tipc_own_addr)
2283 return MAX_MSG_SIZE;
2284
2285 n_ptr = tipc_node_find(dest);
2286 if (n_ptr) {
2287 tipc_node_lock(n_ptr);
2288 l_ptr = n_ptr->active_links[selector & 1];
2289 if (l_ptr)
2290 res = l_ptr->max_pkt;
2291 tipc_node_unlock(n_ptr);
2292 }
2293 return res;
2294 }
2295
2296 static void link_print(struct tipc_link *l_ptr, const char *str)
2297 {
2298 struct tipc_bearer *b_ptr;
2299
2300 rcu_read_lock();
2301 b_ptr = rcu_dereference_rtnl(bearer_list[l_ptr->bearer_id]);
2302 if (b_ptr)
2303 pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name);
2304 rcu_read_unlock();
2305
2306 if (link_working_unknown(l_ptr))
2307 pr_cont(":WU\n");
2308 else if (link_reset_reset(l_ptr))
2309 pr_cont(":RR\n");
2310 else if (link_reset_unknown(l_ptr))
2311 pr_cont(":RU\n");
2312 else if (link_working_working(l_ptr))
2313 pr_cont(":WW\n");
2314 else
2315 pr_cont("\n");
2316 }
2317
2318 /* Parse and validate nested (link) properties valid for media, bearer and link
2319 */
2320 int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
2321 {
2322 int err;
2323
2324 err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop,
2325 tipc_nl_prop_policy);
2326 if (err)
2327 return err;
2328
2329 if (props[TIPC_NLA_PROP_PRIO]) {
2330 u32 prio;
2331
2332 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2333 if (prio > TIPC_MAX_LINK_PRI)
2334 return -EINVAL;
2335 }
2336
2337 if (props[TIPC_NLA_PROP_TOL]) {
2338 u32 tol;
2339
2340 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2341 if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
2342 return -EINVAL;
2343 }
2344
2345 if (props[TIPC_NLA_PROP_WIN]) {
2346 u32 win;
2347
2348 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2349 if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN))
2350 return -EINVAL;
2351 }
2352
2353 return 0;
2354 }
2355
2356 int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info)
2357 {
2358 int err;
2359 int res = 0;
2360 int bearer_id;
2361 char *name;
2362 struct tipc_link *link;
2363 struct tipc_node *node;
2364 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2365
2366 if (!info->attrs[TIPC_NLA_LINK])
2367 return -EINVAL;
2368
2369 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
2370 info->attrs[TIPC_NLA_LINK],
2371 tipc_nl_link_policy);
2372 if (err)
2373 return err;
2374
2375 if (!attrs[TIPC_NLA_LINK_NAME])
2376 return -EINVAL;
2377
2378 name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2379
2380 node = tipc_link_find_owner(name, &bearer_id);
2381 if (!node)
2382 return -EINVAL;
2383
2384 tipc_node_lock(node);
2385
2386 link = node->links[bearer_id];
2387 if (!link) {
2388 res = -EINVAL;
2389 goto out;
2390 }
2391
2392 if (attrs[TIPC_NLA_LINK_PROP]) {
2393 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
2394
2395 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
2396 props);
2397 if (err) {
2398 res = err;
2399 goto out;
2400 }
2401
2402 if (props[TIPC_NLA_PROP_TOL]) {
2403 u32 tol;
2404
2405 tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
2406 link_set_supervision_props(link, tol);
2407 tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0, 0);
2408 }
2409 if (props[TIPC_NLA_PROP_PRIO]) {
2410 u32 prio;
2411
2412 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
2413 link->priority = prio;
2414 tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio, 0);
2415 }
2416 if (props[TIPC_NLA_PROP_WIN]) {
2417 u32 win;
2418
2419 win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
2420 tipc_link_set_queue_limits(link, win);
2421 }
2422 }
2423
2424 out:
2425 tipc_node_unlock(node);
2426
2427 return res;
2428 }
2429
2430 static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
2431 {
2432 int i;
2433 struct nlattr *stats;
2434
2435 struct nla_map {
2436 u32 key;
2437 u32 val;
2438 };
2439
2440 struct nla_map map[] = {
2441 {TIPC_NLA_STATS_RX_INFO, s->recv_info},
2442 {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
2443 {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
2444 {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
2445 {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
2446 {TIPC_NLA_STATS_TX_INFO, s->sent_info},
2447 {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
2448 {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
2449 {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
2450 {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
2451 {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
2452 s->msg_length_counts : 1},
2453 {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
2454 {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
2455 {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
2456 {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
2457 {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
2458 {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
2459 {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
2460 {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
2461 {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
2462 {TIPC_NLA_STATS_RX_STATES, s->recv_states},
2463 {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
2464 {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
2465 {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
2466 {TIPC_NLA_STATS_TX_STATES, s->sent_states},
2467 {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
2468 {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
2469 {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
2470 {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
2471 {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
2472 {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
2473 {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
2474 {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
2475 (s->accu_queue_sz / s->queue_sz_counts) : 0}
2476 };
2477
2478 stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
2479 if (!stats)
2480 return -EMSGSIZE;
2481
2482 for (i = 0; i < ARRAY_SIZE(map); i++)
2483 if (nla_put_u32(skb, map[i].key, map[i].val))
2484 goto msg_full;
2485
2486 nla_nest_end(skb, stats);
2487
2488 return 0;
2489 msg_full:
2490 nla_nest_cancel(skb, stats);
2491
2492 return -EMSGSIZE;
2493 }
2494
2495 /* Caller should hold appropriate locks to protect the link */
2496 static int __tipc_nl_add_link(struct tipc_nl_msg *msg, struct tipc_link *link)
2497 {
2498 int err;
2499 void *hdr;
2500 struct nlattr *attrs;
2501 struct nlattr *prop;
2502
2503 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_v2_family,
2504 NLM_F_MULTI, TIPC_NL_LINK_GET);
2505 if (!hdr)
2506 return -EMSGSIZE;
2507
2508 attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
2509 if (!attrs)
2510 goto msg_full;
2511
2512 if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
2513 goto attr_msg_full;
2514 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST,
2515 tipc_cluster_mask(tipc_own_addr)))
2516 goto attr_msg_full;
2517 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->max_pkt))
2518 goto attr_msg_full;
2519 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no))
2520 goto attr_msg_full;
2521 if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no))
2522 goto attr_msg_full;
2523
2524 if (tipc_link_is_up(link))
2525 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
2526 goto attr_msg_full;
2527 if (tipc_link_is_active(link))
2528 if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
2529 goto attr_msg_full;
2530
2531 prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
2532 if (!prop)
2533 goto attr_msg_full;
2534 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2535 goto prop_msg_full;
2536 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
2537 goto prop_msg_full;
2538 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
2539 link->queue_limit[TIPC_LOW_IMPORTANCE]))
2540 goto prop_msg_full;
2541 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
2542 goto prop_msg_full;
2543 nla_nest_end(msg->skb, prop);
2544
2545 err = __tipc_nl_add_stats(msg->skb, &link->stats);
2546 if (err)
2547 goto attr_msg_full;
2548
2549 nla_nest_end(msg->skb, attrs);
2550 genlmsg_end(msg->skb, hdr);
2551
2552 return 0;
2553
2554 prop_msg_full:
2555 nla_nest_cancel(msg->skb, prop);
2556 attr_msg_full:
2557 nla_nest_cancel(msg->skb, attrs);
2558 msg_full:
2559 genlmsg_cancel(msg->skb, hdr);
2560
2561 return -EMSGSIZE;
2562 }
2563
2564 /* Caller should hold node lock */
2565 static int __tipc_nl_add_node_links(struct tipc_nl_msg *msg,
2566 struct tipc_node *node,
2567 u32 *prev_link)
2568 {
2569 u32 i;
2570 int err;
2571
2572 for (i = *prev_link; i < MAX_BEARERS; i++) {
2573 *prev_link = i;
2574
2575 if (!node->links[i])
2576 continue;
2577
2578 err = __tipc_nl_add_link(msg, node->links[i]);
2579 if (err)
2580 return err;
2581 }
2582 *prev_link = 0;
2583
2584 return 0;
2585 }
2586
2587 int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb)
2588 {
2589 struct tipc_node *node;
2590 struct tipc_nl_msg msg;
2591 u32 prev_node = cb->args[0];
2592 u32 prev_link = cb->args[1];
2593 int done = cb->args[2];
2594 int err;
2595
2596 if (done)
2597 return 0;
2598
2599 msg.skb = skb;
2600 msg.portid = NETLINK_CB(cb->skb).portid;
2601 msg.seq = cb->nlh->nlmsg_seq;
2602
2603 rcu_read_lock();
2604
2605 if (prev_node) {
2606 node = tipc_node_find(prev_node);
2607 if (!node) {
2608 /* We never set seq or call nl_dump_check_consistent()
2609 * this means that setting prev_seq here will cause the
2610 * consistence check to fail in the netlink callback
2611 * handler. Resulting in the last NLMSG_DONE message
2612 * having the NLM_F_DUMP_INTR flag set.
2613 */
2614 cb->prev_seq = 1;
2615 goto out;
2616 }
2617
2618 list_for_each_entry_continue_rcu(node, &tipc_node_list, list) {
2619 tipc_node_lock(node);
2620 err = __tipc_nl_add_node_links(&msg, node, &prev_link);
2621 tipc_node_unlock(node);
2622 if (err)
2623 goto out;
2624
2625 prev_node = node->addr;
2626 }
2627 } else {
2628 err = tipc_nl_add_bc_link(&msg);
2629 if (err)
2630 goto out;
2631
2632 list_for_each_entry_rcu(node, &tipc_node_list, list) {
2633 tipc_node_lock(node);
2634 err = __tipc_nl_add_node_links(&msg, node, &prev_link);
2635 tipc_node_unlock(node);
2636 if (err)
2637 goto out;
2638
2639 prev_node = node->addr;
2640 }
2641 }
2642 done = 1;
2643 out:
2644 rcu_read_unlock();
2645
2646 cb->args[0] = prev_node;
2647 cb->args[1] = prev_link;
2648 cb->args[2] = done;
2649
2650 return skb->len;
2651 }
2652
2653 int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info)
2654 {
2655 struct sk_buff *ans_skb;
2656 struct tipc_nl_msg msg;
2657 struct tipc_link *link;
2658 struct tipc_node *node;
2659 char *name;
2660 int bearer_id;
2661 int err;
2662
2663 if (!info->attrs[TIPC_NLA_LINK_NAME])
2664 return -EINVAL;
2665
2666 name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]);
2667 node = tipc_link_find_owner(name, &bearer_id);
2668 if (!node)
2669 return -EINVAL;
2670
2671 ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2672 if (!ans_skb)
2673 return -ENOMEM;
2674
2675 msg.skb = ans_skb;
2676 msg.portid = info->snd_portid;
2677 msg.seq = info->snd_seq;
2678
2679 tipc_node_lock(node);
2680 link = node->links[bearer_id];
2681 if (!link) {
2682 err = -EINVAL;
2683 goto err_out;
2684 }
2685
2686 err = __tipc_nl_add_link(&msg, link);
2687 if (err)
2688 goto err_out;
2689
2690 tipc_node_unlock(node);
2691
2692 return genlmsg_reply(ans_skb, info);
2693
2694 err_out:
2695 tipc_node_unlock(node);
2696 nlmsg_free(ans_skb);
2697
2698 return err;
2699 }
2700
2701 int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info)
2702 {
2703 int err;
2704 char *link_name;
2705 unsigned int bearer_id;
2706 struct tipc_link *link;
2707 struct tipc_node *node;
2708 struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
2709
2710 if (!info->attrs[TIPC_NLA_LINK])
2711 return -EINVAL;
2712
2713 err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
2714 info->attrs[TIPC_NLA_LINK],
2715 tipc_nl_link_policy);
2716 if (err)
2717 return err;
2718
2719 if (!attrs[TIPC_NLA_LINK_NAME])
2720 return -EINVAL;
2721
2722 link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
2723
2724 if (strcmp(link_name, tipc_bclink_name) == 0) {
2725 err = tipc_bclink_reset_stats();
2726 if (err)
2727 return err;
2728 return 0;
2729 }
2730
2731 node = tipc_link_find_owner(link_name, &bearer_id);
2732 if (!node)
2733 return -EINVAL;
2734
2735 tipc_node_lock(node);
2736
2737 link = node->links[bearer_id];
2738 if (!link) {
2739 tipc_node_unlock(node);
2740 return -EINVAL;
2741 }
2742
2743 link_reset_statistics(link);
2744
2745 tipc_node_unlock(node);
2746
2747 return 0;
2748 }
Linux with added FPC-III support