Commit | Line | Data |
---|---|---|
b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
c1336ee4 | 4 | * Copyright (c) 1996-2007, 2012-2015, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
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. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
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 | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
e3eea1eb | 38 | #include "subscr.h" |
b97bf3fd | 39 | #include "link.h" |
7be57fc6 | 40 | #include "bcast.h" |
9816f061 | 41 | #include "socket.h" |
b97bf3fd | 42 | #include "name_distr.h" |
b97bf3fd | 43 | #include "discover.h" |
0655f6a8 | 44 | #include "netlink.h" |
b97bf3fd | 45 | |
796c75d0 YX |
46 | #include <linux/pkt_sched.h> |
47 | ||
2cf8aa19 EH |
48 | /* |
49 | * Error message prefixes | |
50 | */ | |
6e498158 | 51 | static const char *link_co_err = "Link tunneling error, "; |
2cf8aa19 | 52 | static const char *link_rst_msg = "Resetting link "; |
b97bf3fd | 53 | |
7be57fc6 RA |
54 | static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = { |
55 | [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC }, | |
56 | [TIPC_NLA_LINK_NAME] = { | |
57 | .type = NLA_STRING, | |
58 | .len = TIPC_MAX_LINK_NAME | |
59 | }, | |
60 | [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 }, | |
61 | [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG }, | |
62 | [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG }, | |
63 | [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG }, | |
64 | [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED }, | |
65 | [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED }, | |
66 | [TIPC_NLA_LINK_RX] = { .type = NLA_U32 }, | |
67 | [TIPC_NLA_LINK_TX] = { .type = NLA_U32 } | |
68 | }; | |
69 | ||
0655f6a8 RA |
70 | /* Properties valid for media, bearar and link */ |
71 | static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { | |
72 | [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, | |
73 | [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, | |
74 | [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, | |
75 | [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } | |
76 | }; | |
77 | ||
d999297c JPM |
78 | /* |
79 | * Interval between NACKs when packets arrive out of order | |
80 | */ | |
81 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
a686e685 AS |
82 | /* |
83 | * Out-of-range value for link session numbers | |
84 | */ | |
d3504c34 | 85 | #define WILDCARD_SESSION 0x10000 |
a686e685 | 86 | |
662921cd | 87 | /* Link FSM states: |
b97bf3fd | 88 | */ |
d3504c34 | 89 | enum { |
662921cd JPM |
90 | LINK_ESTABLISHED = 0xe, |
91 | LINK_ESTABLISHING = 0xe << 4, | |
92 | LINK_RESET = 0x1 << 8, | |
93 | LINK_RESETTING = 0x2 << 12, | |
94 | LINK_PEER_RESET = 0xd << 16, | |
95 | LINK_FAILINGOVER = 0xf << 20, | |
96 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
97 | }; |
98 | ||
99 | /* Link FSM state checking routines | |
100 | */ | |
662921cd | 101 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 102 | { |
662921cd | 103 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 104 | } |
b97bf3fd | 105 | |
d999297c JPM |
106 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
107 | struct sk_buff_head *xmitq); | |
426cc2b8 JPM |
108 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
109 | u16 rcvgap, int tolerance, int priority, | |
110 | struct sk_buff_head *xmitq); | |
a18c4bc3 PG |
111 | static void link_reset_statistics(struct tipc_link *l_ptr); |
112 | static void link_print(struct tipc_link *l_ptr, const char *str); | |
247f0f3c | 113 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf); |
8b4ed863 | 114 | |
b97bf3fd | 115 | /* |
05790c64 | 116 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 117 | */ |
662921cd | 118 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 119 | { |
662921cd JPM |
120 | return link_is_up(l); |
121 | } | |
122 | ||
123 | bool tipc_link_is_reset(struct tipc_link *l) | |
124 | { | |
125 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
126 | } | |
127 | ||
73f646ce JPM |
128 | bool tipc_link_is_establishing(struct tipc_link *l) |
129 | { | |
130 | return l->state == LINK_ESTABLISHING; | |
131 | } | |
132 | ||
662921cd JPM |
133 | bool tipc_link_is_synching(struct tipc_link *l) |
134 | { | |
135 | return l->state == LINK_SYNCHING; | |
136 | } | |
137 | ||
138 | bool tipc_link_is_failingover(struct tipc_link *l) | |
139 | { | |
140 | return l->state == LINK_FAILINGOVER; | |
141 | } | |
142 | ||
143 | bool tipc_link_is_blocked(struct tipc_link *l) | |
144 | { | |
145 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
146 | } |
147 | ||
9d13ec65 | 148 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 149 | { |
9d13ec65 JPM |
150 | struct tipc_node *n = l->owner; |
151 | ||
152 | return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l); | |
b97bf3fd PL |
153 | } |
154 | ||
440d8963 JPM |
155 | static u32 link_own_addr(struct tipc_link *l) |
156 | { | |
157 | return msg_prevnode(l->pmsg); | |
158 | } | |
159 | ||
b97bf3fd | 160 | /** |
4323add6 | 161 | * tipc_link_create - create a new link |
440d8963 JPM |
162 | * @n: pointer to associated node |
163 | * @b: pointer to associated bearer | |
164 | * @ownnode: identity of own node | |
165 | * @peer: identity of peer node | |
166 | * @maddr: media address to be used | |
167 | * @inputq: queue to put messages ready for delivery | |
168 | * @namedq: queue to put binding table update messages ready for delivery | |
169 | * @link: return value, pointer to put the created link | |
c4307285 | 170 | * |
440d8963 | 171 | * Returns true if link was created, otherwise false |
b97bf3fd | 172 | */ |
440d8963 JPM |
173 | bool tipc_link_create(struct tipc_node *n, struct tipc_bearer *b, u32 session, |
174 | u32 ownnode, u32 peer, struct tipc_media_addr *maddr, | |
175 | struct sk_buff_head *inputq, struct sk_buff_head *namedq, | |
176 | struct tipc_link **link) | |
b97bf3fd | 177 | { |
440d8963 JPM |
178 | struct tipc_link *l; |
179 | struct tipc_msg *hdr; | |
b97bf3fd | 180 | char *if_name; |
37b9c08a | 181 | |
440d8963 JPM |
182 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
183 | if (!l) | |
184 | return false; | |
185 | *link = l; | |
37b9c08a | 186 | |
440d8963 JPM |
187 | /* Note: peer i/f name is completed by reset/activate message */ |
188 | if_name = strchr(b->name, ':') + 1; | |
189 | sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown", | |
190 | tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode), | |
191 | if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
b97bf3fd | 192 | |
440d8963 JPM |
193 | l->addr = peer; |
194 | l->media_addr = maddr; | |
195 | l->owner = n; | |
196 | l->peer_session = WILDCARD_SESSION; | |
197 | l->bearer_id = b->identity; | |
198 | l->tolerance = b->tolerance; | |
199 | l->net_plane = b->net_plane; | |
200 | l->advertised_mtu = b->mtu; | |
201 | l->mtu = b->mtu; | |
202 | l->priority = b->priority; | |
203 | tipc_link_set_queue_limits(l, b->window); | |
204 | l->inputq = inputq; | |
205 | l->namedq = namedq; | |
206 | l->state = LINK_RESETTING; | |
207 | l->pmsg = (struct tipc_msg *)&l->proto_msg; | |
208 | hdr = l->pmsg; | |
209 | tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer); | |
210 | msg_set_size(hdr, sizeof(l->proto_msg)); | |
211 | msg_set_session(hdr, session); | |
212 | msg_set_bearer_id(hdr, l->bearer_id); | |
213 | strcpy((char *)msg_data(hdr), if_name); | |
214 | __skb_queue_head_init(&l->transmq); | |
215 | __skb_queue_head_init(&l->backlogq); | |
216 | __skb_queue_head_init(&l->deferdq); | |
217 | skb_queue_head_init(&l->wakeupq); | |
218 | skb_queue_head_init(l->inputq); | |
219 | return true; | |
b97bf3fd PL |
220 | } |
221 | ||
d999297c JPM |
222 | /* tipc_link_build_bcast_sync_msg() - synchronize broadcast link endpoints. |
223 | * | |
224 | * Give a newly added peer node the sequence number where it should | |
225 | * start receiving and acking broadcast packets. | |
226 | */ | |
5045f7b9 JPM |
227 | void tipc_link_build_bcast_sync_msg(struct tipc_link *l, |
228 | struct sk_buff_head *xmitq) | |
d999297c JPM |
229 | { |
230 | struct sk_buff *skb; | |
231 | struct sk_buff_head list; | |
5a4c3552 | 232 | u16 last_sent; |
d999297c JPM |
233 | |
234 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
235 | 0, l->addr, link_own_addr(l), 0, 0, 0); | |
236 | if (!skb) | |
237 | return; | |
5a4c3552 JM |
238 | last_sent = tipc_bclink_get_last_sent(l->owner->net); |
239 | msg_set_last_bcast(buf_msg(skb), last_sent); | |
d999297c JPM |
240 | __skb_queue_head_init(&list); |
241 | __skb_queue_tail(&list, skb); | |
242 | tipc_link_xmit(l, &list, xmitq); | |
243 | } | |
244 | ||
6ab30f9c JPM |
245 | /** |
246 | * tipc_link_fsm_evt - link finite state machine | |
247 | * @l: pointer to link | |
248 | * @evt: state machine event to be processed | |
6ab30f9c | 249 | */ |
662921cd | 250 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 251 | { |
5045f7b9 | 252 | int rc = 0; |
6ab30f9c JPM |
253 | |
254 | switch (l->state) { | |
662921cd | 255 | case LINK_RESETTING: |
6ab30f9c | 256 | switch (evt) { |
662921cd JPM |
257 | case LINK_PEER_RESET_EVT: |
258 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 259 | break; |
662921cd JPM |
260 | case LINK_RESET_EVT: |
261 | l->state = LINK_RESET; | |
262 | break; | |
263 | case LINK_FAILURE_EVT: | |
264 | case LINK_FAILOVER_BEGIN_EVT: | |
265 | case LINK_ESTABLISH_EVT: | |
266 | case LINK_FAILOVER_END_EVT: | |
267 | case LINK_SYNCH_BEGIN_EVT: | |
268 | case LINK_SYNCH_END_EVT: | |
269 | default: | |
270 | goto illegal_evt; | |
271 | } | |
272 | break; | |
273 | case LINK_RESET: | |
274 | switch (evt) { | |
275 | case LINK_PEER_RESET_EVT: | |
276 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 277 | break; |
662921cd JPM |
278 | case LINK_FAILOVER_BEGIN_EVT: |
279 | l->state = LINK_FAILINGOVER; | |
280 | case LINK_FAILURE_EVT: | |
281 | case LINK_RESET_EVT: | |
282 | case LINK_ESTABLISH_EVT: | |
283 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 284 | break; |
662921cd JPM |
285 | case LINK_SYNCH_BEGIN_EVT: |
286 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 287 | default: |
662921cd | 288 | goto illegal_evt; |
6ab30f9c JPM |
289 | } |
290 | break; | |
662921cd | 291 | case LINK_PEER_RESET: |
6ab30f9c | 292 | switch (evt) { |
662921cd JPM |
293 | case LINK_RESET_EVT: |
294 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 295 | break; |
662921cd JPM |
296 | case LINK_PEER_RESET_EVT: |
297 | case LINK_ESTABLISH_EVT: | |
298 | case LINK_FAILURE_EVT: | |
6ab30f9c | 299 | break; |
662921cd JPM |
300 | case LINK_SYNCH_BEGIN_EVT: |
301 | case LINK_SYNCH_END_EVT: | |
302 | case LINK_FAILOVER_BEGIN_EVT: | |
303 | case LINK_FAILOVER_END_EVT: | |
304 | default: | |
305 | goto illegal_evt; | |
306 | } | |
307 | break; | |
308 | case LINK_FAILINGOVER: | |
309 | switch (evt) { | |
310 | case LINK_FAILOVER_END_EVT: | |
311 | l->state = LINK_RESET; | |
6ab30f9c | 312 | break; |
662921cd JPM |
313 | case LINK_PEER_RESET_EVT: |
314 | case LINK_RESET_EVT: | |
315 | case LINK_ESTABLISH_EVT: | |
316 | case LINK_FAILURE_EVT: | |
317 | break; | |
318 | case LINK_FAILOVER_BEGIN_EVT: | |
319 | case LINK_SYNCH_BEGIN_EVT: | |
320 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 321 | default: |
662921cd | 322 | goto illegal_evt; |
6ab30f9c JPM |
323 | } |
324 | break; | |
662921cd | 325 | case LINK_ESTABLISHING: |
6ab30f9c | 326 | switch (evt) { |
662921cd JPM |
327 | case LINK_ESTABLISH_EVT: |
328 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 329 | break; |
662921cd JPM |
330 | case LINK_FAILOVER_BEGIN_EVT: |
331 | l->state = LINK_FAILINGOVER; | |
332 | break; | |
662921cd | 333 | case LINK_RESET_EVT: |
73f646ce JPM |
334 | l->state = LINK_RESET; |
335 | break; | |
662921cd | 336 | case LINK_FAILURE_EVT: |
73f646ce | 337 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
338 | case LINK_SYNCH_BEGIN_EVT: |
339 | case LINK_FAILOVER_END_EVT: | |
340 | break; | |
341 | case LINK_SYNCH_END_EVT: | |
342 | default: | |
343 | goto illegal_evt; | |
344 | } | |
345 | break; | |
346 | case LINK_ESTABLISHED: | |
347 | switch (evt) { | |
348 | case LINK_PEER_RESET_EVT: | |
349 | l->state = LINK_PEER_RESET; | |
350 | rc |= TIPC_LINK_DOWN_EVT; | |
351 | break; | |
352 | case LINK_FAILURE_EVT: | |
353 | l->state = LINK_RESETTING; | |
354 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 355 | break; |
662921cd JPM |
356 | case LINK_RESET_EVT: |
357 | l->state = LINK_RESET; | |
6ab30f9c | 358 | break; |
662921cd | 359 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 360 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 361 | break; |
662921cd JPM |
362 | case LINK_SYNCH_BEGIN_EVT: |
363 | l->state = LINK_SYNCHING; | |
364 | break; | |
662921cd JPM |
365 | case LINK_FAILOVER_BEGIN_EVT: |
366 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 367 | default: |
662921cd | 368 | goto illegal_evt; |
6ab30f9c JPM |
369 | } |
370 | break; | |
662921cd | 371 | case LINK_SYNCHING: |
6ab30f9c | 372 | switch (evt) { |
662921cd JPM |
373 | case LINK_PEER_RESET_EVT: |
374 | l->state = LINK_PEER_RESET; | |
375 | rc |= TIPC_LINK_DOWN_EVT; | |
376 | break; | |
377 | case LINK_FAILURE_EVT: | |
378 | l->state = LINK_RESETTING; | |
379 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 380 | break; |
662921cd JPM |
381 | case LINK_RESET_EVT: |
382 | l->state = LINK_RESET; | |
6ab30f9c | 383 | break; |
662921cd JPM |
384 | case LINK_ESTABLISH_EVT: |
385 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 386 | break; |
662921cd JPM |
387 | case LINK_SYNCH_END_EVT: |
388 | l->state = LINK_ESTABLISHED; | |
389 | break; | |
390 | case LINK_FAILOVER_BEGIN_EVT: | |
391 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 392 | default: |
662921cd | 393 | goto illegal_evt; |
6ab30f9c JPM |
394 | } |
395 | break; | |
396 | default: | |
662921cd | 397 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 398 | } |
662921cd JPM |
399 | return rc; |
400 | illegal_evt: | |
401 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
402 | evt, l->state, l->name); | |
6ab30f9c JPM |
403 | return rc; |
404 | } | |
405 | ||
333ef69e JPM |
406 | /* link_profile_stats - update statistical profiling of traffic |
407 | */ | |
408 | static void link_profile_stats(struct tipc_link *l) | |
409 | { | |
410 | struct sk_buff *skb; | |
411 | struct tipc_msg *msg; | |
412 | int length; | |
413 | ||
414 | /* Update counters used in statistical profiling of send traffic */ | |
415 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
416 | l->stats.queue_sz_counts++; | |
417 | ||
418 | skb = skb_peek(&l->transmq); | |
419 | if (!skb) | |
420 | return; | |
421 | msg = buf_msg(skb); | |
422 | length = msg_size(msg); | |
423 | ||
424 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
425 | if (msg_type(msg) != FIRST_FRAGMENT) | |
426 | return; | |
427 | length = msg_size(msg_get_wrapped(msg)); | |
428 | } | |
429 | l->stats.msg_lengths_total += length; | |
430 | l->stats.msg_length_counts++; | |
431 | if (length <= 64) | |
432 | l->stats.msg_length_profile[0]++; | |
433 | else if (length <= 256) | |
434 | l->stats.msg_length_profile[1]++; | |
435 | else if (length <= 1024) | |
436 | l->stats.msg_length_profile[2]++; | |
437 | else if (length <= 4096) | |
438 | l->stats.msg_length_profile[3]++; | |
439 | else if (length <= 16384) | |
440 | l->stats.msg_length_profile[4]++; | |
441 | else if (length <= 32768) | |
442 | l->stats.msg_length_profile[5]++; | |
443 | else | |
444 | l->stats.msg_length_profile[6]++; | |
445 | } | |
446 | ||
447 | /* tipc_link_timeout - perform periodic task as instructed from node timeout | |
448 | */ | |
449 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
450 | { | |
451 | int rc = 0; | |
5045f7b9 JPM |
452 | int mtyp = STATE_MSG; |
453 | bool xmit = false; | |
454 | bool prb = false; | |
333ef69e JPM |
455 | |
456 | link_profile_stats(l); | |
5045f7b9 | 457 | |
662921cd JPM |
458 | switch (l->state) { |
459 | case LINK_ESTABLISHED: | |
460 | case LINK_SYNCHING: | |
5045f7b9 JPM |
461 | if (!l->silent_intv_cnt) { |
462 | if (tipc_bclink_acks_missing(l->owner)) | |
463 | xmit = true; | |
464 | } else if (l->silent_intv_cnt <= l->abort_limit) { | |
465 | xmit = true; | |
466 | prb = true; | |
467 | } else { | |
662921cd | 468 | rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
5045f7b9 JPM |
469 | } |
470 | l->silent_intv_cnt++; | |
662921cd JPM |
471 | break; |
472 | case LINK_RESET: | |
5045f7b9 JPM |
473 | xmit = true; |
474 | mtyp = RESET_MSG; | |
662921cd JPM |
475 | break; |
476 | case LINK_ESTABLISHING: | |
5045f7b9 JPM |
477 | xmit = true; |
478 | mtyp = ACTIVATE_MSG; | |
662921cd | 479 | break; |
662921cd | 480 | case LINK_PEER_RESET: |
598411d7 | 481 | case LINK_RESETTING: |
662921cd JPM |
482 | case LINK_FAILINGOVER: |
483 | break; | |
484 | default: | |
485 | break; | |
5045f7b9 | 486 | } |
662921cd | 487 | |
5045f7b9 JPM |
488 | if (xmit) |
489 | tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq); | |
490 | ||
333ef69e JPM |
491 | return rc; |
492 | } | |
493 | ||
b97bf3fd | 494 | /** |
3127a020 | 495 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 496 | * @link: congested link |
3127a020 | 497 | * @list: message that was attempted sent |
50100a5e | 498 | * Create pseudo msg to send back to user when congestion abates |
22d85c79 | 499 | * Does not consume buffer list |
b97bf3fd | 500 | */ |
3127a020 | 501 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 502 | { |
3127a020 JPM |
503 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
504 | int imp = msg_importance(msg); | |
505 | u32 oport = msg_origport(msg); | |
506 | u32 addr = link_own_addr(link); | |
507 | struct sk_buff *skb; | |
508 | ||
509 | /* This really cannot happen... */ | |
510 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
511 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
22d85c79 | 512 | return -ENOBUFS; |
3127a020 JPM |
513 | } |
514 | /* Non-blocking sender: */ | |
515 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
516 | return -ELINKCONG; | |
517 | ||
518 | /* Create and schedule wakeup pseudo message */ | |
519 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
520 | addr, addr, oport, 0, 0); | |
521 | if (!skb) | |
22d85c79 | 522 | return -ENOBUFS; |
3127a020 JPM |
523 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); |
524 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
525 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 526 | link->stats.link_congs++; |
3127a020 | 527 | return -ELINKCONG; |
b97bf3fd PL |
528 | } |
529 | ||
50100a5e JPM |
530 | /** |
531 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
532 | * @link: congested link | |
533 | * Move a number of waiting users, as permitted by available space in | |
534 | * the send queue, from link wait queue to node wait queue for wakeup | |
535 | */ | |
1f66d161 | 536 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 537 | { |
1f66d161 JPM |
538 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
539 | int imp, lim; | |
58d78b32 | 540 | struct sk_buff *skb, *tmp; |
50100a5e | 541 | |
1f66d161 JPM |
542 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
543 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
544 | lim = l->window + l->backlog[imp].limit; | |
545 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
546 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 547 | break; |
1f66d161 | 548 | skb_unlink(skb, &l->wakeupq); |
d39bbd44 | 549 | skb_queue_tail(l->inputq, skb); |
b97bf3fd | 550 | } |
b97bf3fd PL |
551 | } |
552 | ||
b97bf3fd | 553 | /** |
4323add6 | 554 | * tipc_link_reset_fragments - purge link's inbound message fragments queue |
b97bf3fd PL |
555 | * @l_ptr: pointer to link |
556 | */ | |
a18c4bc3 | 557 | void tipc_link_reset_fragments(struct tipc_link *l_ptr) |
b97bf3fd | 558 | { |
37e22164 JPM |
559 | kfree_skb(l_ptr->reasm_buf); |
560 | l_ptr->reasm_buf = NULL; | |
b97bf3fd PL |
561 | } |
562 | ||
7d967b67 | 563 | void tipc_link_purge_backlog(struct tipc_link *l) |
1f66d161 JPM |
564 | { |
565 | __skb_queue_purge(&l->backlogq); | |
566 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
567 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
568 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
569 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
570 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
571 | } | |
572 | ||
c4307285 | 573 | /** |
581465fa | 574 | * tipc_link_purge_queues - purge all pkt queues associated with link |
b97bf3fd PL |
575 | * @l_ptr: pointer to link |
576 | */ | |
581465fa | 577 | void tipc_link_purge_queues(struct tipc_link *l_ptr) |
b97bf3fd | 578 | { |
05dcc5aa JPM |
579 | __skb_queue_purge(&l_ptr->deferdq); |
580 | __skb_queue_purge(&l_ptr->transmq); | |
1f66d161 | 581 | tipc_link_purge_backlog(l_ptr); |
4323add6 | 582 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
583 | } |
584 | ||
6e498158 | 585 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 586 | { |
662921cd | 587 | tipc_link_fsm_evt(l, LINK_RESET_EVT); |
b97bf3fd | 588 | |
a686e685 | 589 | /* Link is down, accept any session */ |
6e498158 | 590 | l->peer_session = WILDCARD_SESSION; |
b97bf3fd | 591 | |
6e498158 JPM |
592 | /* If peer is up, it only accepts an incremented session number */ |
593 | msg_set_session(l->pmsg, msg_session(l->pmsg) + 1); | |
b97bf3fd | 594 | |
6e498158 JPM |
595 | /* Prepare for renewed mtu size negotiation */ |
596 | l->mtu = l->advertised_mtu; | |
b97bf3fd | 597 | |
23d8335d | 598 | /* Clean up all queues: */ |
6e498158 JPM |
599 | __skb_queue_purge(&l->transmq); |
600 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 601 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
6e498158 JPM |
602 | |
603 | tipc_link_purge_backlog(l); | |
604 | kfree_skb(l->reasm_buf); | |
605 | kfree_skb(l->failover_reasm_skb); | |
606 | l->reasm_buf = NULL; | |
607 | l->failover_reasm_skb = NULL; | |
608 | l->rcv_unacked = 0; | |
609 | l->snd_nxt = 1; | |
610 | l->rcv_nxt = 1; | |
611 | l->silent_intv_cnt = 0; | |
612 | l->stats.recv_info = 0; | |
613 | l->stale_count = 0; | |
614 | link_reset_statistics(l); | |
b97bf3fd PL |
615 | } |
616 | ||
4f1688b2 | 617 | /** |
9fbfb8b1 | 618 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 619 | * @link: link to use |
a6ca1094 YX |
620 | * @list: chain of buffers containing message |
621 | * | |
22d85c79 | 622 | * Consumes the buffer chain, except when returning an error code, |
3127a020 JPM |
623 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
624 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
4f1688b2 | 625 | */ |
7f9f95d9 YX |
626 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
627 | struct sk_buff_head *list) | |
4f1688b2 | 628 | { |
a6ca1094 | 629 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
05dcc5aa | 630 | unsigned int maxwin = link->window; |
f21e897e | 631 | unsigned int i, imp = msg_importance(msg); |
ed193ece | 632 | uint mtu = link->mtu; |
a97b9d3f JPM |
633 | u16 ack = mod(link->rcv_nxt - 1); |
634 | u16 seqno = link->snd_nxt; | |
e4bf4f76 | 635 | u16 bc_last_in = link->owner->bclink.last_in; |
440d8963 | 636 | struct tipc_media_addr *addr = link->media_addr; |
05dcc5aa JPM |
637 | struct sk_buff_head *transmq = &link->transmq; |
638 | struct sk_buff_head *backlogq = &link->backlogq; | |
dd3f9e70 | 639 | struct sk_buff *skb, *bskb; |
4f1688b2 | 640 | |
f21e897e JPM |
641 | /* Match msg importance against this and all higher backlog limits: */ |
642 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
643 | if (unlikely(link->backlog[i].len >= link->backlog[i].limit)) | |
644 | return link_schedule_user(link, list); | |
645 | } | |
22d85c79 | 646 | if (unlikely(msg_size(msg) > mtu)) |
4f1688b2 | 647 | return -EMSGSIZE; |
22d85c79 | 648 | |
05dcc5aa | 649 | /* Prepare each packet for sending, and add to relevant queue: */ |
dd3f9e70 JPM |
650 | while (skb_queue_len(list)) { |
651 | skb = skb_peek(list); | |
58dc55f2 | 652 | msg = buf_msg(skb); |
05dcc5aa JPM |
653 | msg_set_seqno(msg, seqno); |
654 | msg_set_ack(msg, ack); | |
4f1688b2 JPM |
655 | msg_set_bcast_ack(msg, bc_last_in); |
656 | ||
05dcc5aa | 657 | if (likely(skb_queue_len(transmq) < maxwin)) { |
dd3f9e70 | 658 | __skb_dequeue(list); |
05dcc5aa JPM |
659 | __skb_queue_tail(transmq, skb); |
660 | tipc_bearer_send(net, link->bearer_id, skb, addr); | |
661 | link->rcv_unacked = 0; | |
662 | seqno++; | |
663 | continue; | |
664 | } | |
dd3f9e70 JPM |
665 | if (tipc_msg_bundle(skb_peek_tail(backlogq), msg, mtu)) { |
666 | kfree_skb(__skb_dequeue(list)); | |
4f1688b2 | 667 | link->stats.sent_bundled++; |
4f1688b2 | 668 | continue; |
05dcc5aa | 669 | } |
dd3f9e70 JPM |
670 | if (tipc_msg_make_bundle(&bskb, msg, mtu, link->addr)) { |
671 | kfree_skb(__skb_dequeue(list)); | |
672 | __skb_queue_tail(backlogq, bskb); | |
673 | link->backlog[msg_importance(buf_msg(bskb))].len++; | |
4f1688b2 JPM |
674 | link->stats.sent_bundled++; |
675 | link->stats.sent_bundles++; | |
dd3f9e70 | 676 | continue; |
4f1688b2 | 677 | } |
dd3f9e70 JPM |
678 | link->backlog[imp].len += skb_queue_len(list); |
679 | skb_queue_splice_tail_init(list, backlogq); | |
4f1688b2 | 680 | } |
a97b9d3f | 681 | link->snd_nxt = seqno; |
4f1688b2 JPM |
682 | return 0; |
683 | } | |
684 | ||
af9b028e JPM |
685 | /** |
686 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
687 | * @link: link to use | |
688 | * @list: chain of buffers containing message | |
689 | * @xmitq: returned list of packets to be sent by caller | |
690 | * | |
691 | * Consumes the buffer chain, except when returning -ELINKCONG, | |
692 | * since the caller then may want to make more send attempts. | |
693 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
694 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
695 | */ | |
696 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
697 | struct sk_buff_head *xmitq) | |
698 | { | |
699 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
700 | unsigned int maxwin = l->window; | |
701 | unsigned int i, imp = msg_importance(hdr); | |
702 | unsigned int mtu = l->mtu; | |
703 | u16 ack = l->rcv_nxt - 1; | |
704 | u16 seqno = l->snd_nxt; | |
705 | u16 bc_last_in = l->owner->bclink.last_in; | |
706 | struct sk_buff_head *transmq = &l->transmq; | |
707 | struct sk_buff_head *backlogq = &l->backlogq; | |
708 | struct sk_buff *skb, *_skb, *bskb; | |
709 | ||
710 | /* Match msg importance against this and all higher backlog limits: */ | |
711 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
712 | if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) | |
713 | return link_schedule_user(l, list); | |
714 | } | |
715 | if (unlikely(msg_size(hdr) > mtu)) | |
716 | return -EMSGSIZE; | |
717 | ||
718 | /* Prepare each packet for sending, and add to relevant queue: */ | |
719 | while (skb_queue_len(list)) { | |
720 | skb = skb_peek(list); | |
721 | hdr = buf_msg(skb); | |
722 | msg_set_seqno(hdr, seqno); | |
723 | msg_set_ack(hdr, ack); | |
724 | msg_set_bcast_ack(hdr, bc_last_in); | |
725 | ||
726 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
727 | _skb = skb_clone(skb, GFP_ATOMIC); | |
728 | if (!_skb) | |
729 | return -ENOBUFS; | |
730 | __skb_dequeue(list); | |
731 | __skb_queue_tail(transmq, skb); | |
732 | __skb_queue_tail(xmitq, _skb); | |
733 | l->rcv_unacked = 0; | |
734 | seqno++; | |
735 | continue; | |
736 | } | |
737 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
738 | kfree_skb(__skb_dequeue(list)); | |
739 | l->stats.sent_bundled++; | |
740 | continue; | |
741 | } | |
742 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
743 | kfree_skb(__skb_dequeue(list)); | |
744 | __skb_queue_tail(backlogq, bskb); | |
745 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
746 | l->stats.sent_bundled++; | |
747 | l->stats.sent_bundles++; | |
748 | continue; | |
749 | } | |
750 | l->backlog[imp].len += skb_queue_len(list); | |
751 | skb_queue_splice_tail_init(list, backlogq); | |
752 | } | |
753 | l->snd_nxt = seqno; | |
754 | return 0; | |
755 | } | |
756 | ||
c64f7a6a | 757 | /* |
247f0f3c | 758 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
759 | * Receive the sequence number where we should start receiving and |
760 | * acking broadcast packets from a newly added peer node, and open | |
761 | * up for reception of such packets. | |
762 | * | |
763 | * Called with node locked | |
764 | */ | |
247f0f3c | 765 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
766 | { |
767 | struct tipc_msg *msg = buf_msg(buf); | |
768 | ||
769 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
770 | n->bclink.recv_permitted = true; | |
771 | kfree_skb(buf); | |
772 | } | |
773 | ||
c4307285 | 774 | /* |
47b4c9a8 YX |
775 | * tipc_link_push_packets - push unsent packets to bearer |
776 | * | |
777 | * Push out the unsent messages of a link where congestion | |
778 | * has abated. Node is locked. | |
779 | * | |
780 | * Called with node locked | |
b97bf3fd | 781 | */ |
05dcc5aa | 782 | void tipc_link_push_packets(struct tipc_link *link) |
b97bf3fd | 783 | { |
05dcc5aa | 784 | struct sk_buff *skb; |
47b4c9a8 | 785 | struct tipc_msg *msg; |
dd3f9e70 | 786 | u16 seqno = link->snd_nxt; |
a97b9d3f | 787 | u16 ack = mod(link->rcv_nxt - 1); |
b97bf3fd | 788 | |
05dcc5aa JPM |
789 | while (skb_queue_len(&link->transmq) < link->window) { |
790 | skb = __skb_dequeue(&link->backlogq); | |
791 | if (!skb) | |
47b4c9a8 | 792 | break; |
05dcc5aa | 793 | msg = buf_msg(skb); |
1f66d161 | 794 | link->backlog[msg_importance(msg)].len--; |
05dcc5aa | 795 | msg_set_ack(msg, ack); |
dd3f9e70 JPM |
796 | msg_set_seqno(msg, seqno); |
797 | seqno = mod(seqno + 1); | |
05dcc5aa JPM |
798 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); |
799 | link->rcv_unacked = 0; | |
800 | __skb_queue_tail(&link->transmq, skb); | |
801 | tipc_bearer_send(link->owner->net, link->bearer_id, | |
440d8963 | 802 | skb, link->media_addr); |
b97bf3fd | 803 | } |
dd3f9e70 | 804 | link->snd_nxt = seqno; |
b97bf3fd PL |
805 | } |
806 | ||
d999297c JPM |
807 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
808 | { | |
809 | struct sk_buff *skb, *_skb; | |
810 | struct tipc_msg *hdr; | |
811 | u16 seqno = l->snd_nxt; | |
812 | u16 ack = l->rcv_nxt - 1; | |
813 | ||
814 | while (skb_queue_len(&l->transmq) < l->window) { | |
815 | skb = skb_peek(&l->backlogq); | |
816 | if (!skb) | |
817 | break; | |
818 | _skb = skb_clone(skb, GFP_ATOMIC); | |
819 | if (!_skb) | |
820 | break; | |
821 | __skb_dequeue(&l->backlogq); | |
822 | hdr = buf_msg(skb); | |
823 | l->backlog[msg_importance(hdr)].len--; | |
824 | __skb_queue_tail(&l->transmq, skb); | |
825 | __skb_queue_tail(xmitq, _skb); | |
826 | msg_set_ack(hdr, ack); | |
827 | msg_set_seqno(hdr, seqno); | |
828 | msg_set_bcast_ack(hdr, l->owner->bclink.last_in); | |
829 | l->rcv_unacked = 0; | |
830 | seqno++; | |
831 | } | |
832 | l->snd_nxt = seqno; | |
833 | } | |
834 | ||
a18c4bc3 | 835 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 836 | struct sk_buff *buf) |
d356eeba AS |
837 | { |
838 | struct tipc_msg *msg = buf_msg(buf); | |
1da46568 | 839 | struct net *net = l_ptr->owner->net; |
d356eeba | 840 | |
2cf8aa19 | 841 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
842 | |
843 | if (l_ptr->addr) { | |
d356eeba | 844 | /* Handle failure on standard link */ |
1a20cc25 JPM |
845 | link_print(l_ptr, "Resetting link "); |
846 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
847 | msg_user(msg), msg_type(msg), msg_size(msg), | |
848 | msg_errcode(msg)); | |
849 | pr_info("sqno %u, prev: %x, src: %x\n", | |
850 | msg_seqno(msg), msg_prevnode(msg), msg_orignode(msg)); | |
d356eeba | 851 | } else { |
d356eeba | 852 | /* Handle failure on broadcast link */ |
6c00055a | 853 | struct tipc_node *n_ptr; |
d356eeba AS |
854 | char addr_string[16]; |
855 | ||
2cf8aa19 EH |
856 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
857 | pr_cont("Outstanding acks: %lu\n", | |
858 | (unsigned long) TIPC_SKB_CB(buf)->handle); | |
617dbeaa | 859 | |
1da46568 | 860 | n_ptr = tipc_bclink_retransmit_to(net); |
d356eeba | 861 | |
c68ca7b7 | 862 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 863 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
864 | pr_info("Reception permitted: %d, Acked: %u\n", |
865 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
866 | n_ptr->bclink.acked); |
867 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
868 | n_ptr->bclink.last_in, | |
869 | n_ptr->bclink.oos_state, | |
870 | n_ptr->bclink.last_sent); | |
d356eeba | 871 | |
b952b2be | 872 | n_ptr->action_flags |= TIPC_BCAST_RESET; |
d356eeba AS |
873 | l_ptr->stale_count = 0; |
874 | } | |
875 | } | |
876 | ||
58dc55f2 | 877 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 878 | u32 retransmits) |
b97bf3fd PL |
879 | { |
880 | struct tipc_msg *msg; | |
881 | ||
58dc55f2 | 882 | if (!skb) |
d356eeba AS |
883 | return; |
884 | ||
58dc55f2 | 885 | msg = buf_msg(skb); |
c4307285 | 886 | |
512137ee | 887 | /* Detect repeated retransmit failures */ |
a97b9d3f | 888 | if (l_ptr->last_retransm == msg_seqno(msg)) { |
512137ee | 889 | if (++l_ptr->stale_count > 100) { |
58dc55f2 | 890 | link_retransmit_failure(l_ptr, skb); |
512137ee | 891 | return; |
d356eeba AS |
892 | } |
893 | } else { | |
a97b9d3f | 894 | l_ptr->last_retransm = msg_seqno(msg); |
512137ee | 895 | l_ptr->stale_count = 1; |
b97bf3fd | 896 | } |
d356eeba | 897 | |
05dcc5aa JPM |
898 | skb_queue_walk_from(&l_ptr->transmq, skb) { |
899 | if (!retransmits) | |
58dc55f2 YX |
900 | break; |
901 | msg = buf_msg(skb); | |
a97b9d3f | 902 | msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1)); |
c4307285 | 903 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 | 904 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
440d8963 | 905 | l_ptr->media_addr); |
3c294cb3 YX |
906 | retransmits--; |
907 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 908 | } |
b97bf3fd PL |
909 | } |
910 | ||
d999297c JPM |
911 | static int tipc_link_retransm(struct tipc_link *l, int retransm, |
912 | struct sk_buff_head *xmitq) | |
913 | { | |
914 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
915 | struct tipc_msg *hdr; | |
916 | ||
917 | if (!skb) | |
918 | return 0; | |
919 | ||
920 | /* Detect repeated retransmit failures on same packet */ | |
921 | if (likely(l->last_retransm != buf_seqno(skb))) { | |
922 | l->last_retransm = buf_seqno(skb); | |
923 | l->stale_count = 1; | |
924 | } else if (++l->stale_count > 100) { | |
925 | link_retransmit_failure(l, skb); | |
662921cd | 926 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c JPM |
927 | } |
928 | skb_queue_walk(&l->transmq, skb) { | |
929 | if (!retransm) | |
930 | return 0; | |
931 | hdr = buf_msg(skb); | |
932 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); | |
933 | if (!_skb) | |
934 | return 0; | |
935 | hdr = buf_msg(_skb); | |
936 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
937 | msg_set_bcast_ack(hdr, l->owner->bclink.last_in); | |
938 | _skb->priority = TC_PRIO_CONTROL; | |
939 | __skb_queue_tail(xmitq, _skb); | |
940 | retransm--; | |
941 | l->stats.retransmitted++; | |
942 | } | |
943 | return 0; | |
944 | } | |
945 | ||
c637c103 | 946 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 947 | * |
c637c103 | 948 | * Consumes buffer if message is of right type |
7ae934be EH |
949 | * Node lock must be held |
950 | */ | |
9073fb8b JPM |
951 | static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb, |
952 | struct sk_buff_head *inputq) | |
7ae934be | 953 | { |
c637c103 | 954 | struct tipc_node *node = link->owner; |
7ae934be | 955 | |
9073fb8b | 956 | switch (msg_user(buf_msg(skb))) { |
c637c103 JPM |
957 | case TIPC_LOW_IMPORTANCE: |
958 | case TIPC_MEDIUM_IMPORTANCE: | |
959 | case TIPC_HIGH_IMPORTANCE: | |
960 | case TIPC_CRITICAL_IMPORTANCE: | |
961 | case CONN_MANAGER: | |
9945e804 | 962 | skb_queue_tail(inputq, skb); |
c637c103 | 963 | return true; |
7ae934be | 964 | case NAME_DISTRIBUTOR: |
c637c103 | 965 | node->bclink.recv_permitted = true; |
d39bbd44 | 966 | skb_queue_tail(link->namedq, skb); |
c637c103 JPM |
967 | return true; |
968 | case MSG_BUNDLER: | |
dff29b1a | 969 | case TUNNEL_PROTOCOL: |
c637c103 | 970 | case MSG_FRAGMENTER: |
7ae934be | 971 | case BCAST_PROTOCOL: |
c637c103 | 972 | return false; |
7ae934be | 973 | default: |
c637c103 JPM |
974 | pr_warn("Dropping received illegal msg type\n"); |
975 | kfree_skb(skb); | |
976 | return false; | |
977 | }; | |
7ae934be | 978 | } |
c637c103 JPM |
979 | |
980 | /* tipc_link_input - process packet that has passed link protocol check | |
981 | * | |
982 | * Consumes buffer | |
7ae934be | 983 | */ |
9073fb8b JPM |
984 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
985 | struct sk_buff_head *inputq) | |
7ae934be | 986 | { |
6e498158 JPM |
987 | struct tipc_node *node = l->owner; |
988 | struct tipc_msg *hdr = buf_msg(skb); | |
989 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 990 | struct sk_buff *iskb; |
9945e804 | 991 | struct sk_buff_head tmpq; |
6e498158 | 992 | int usr = msg_user(hdr); |
6144a996 | 993 | int rc = 0; |
6e498158 JPM |
994 | int pos = 0; |
995 | int ipos = 0; | |
c637c103 | 996 | |
6e498158 JPM |
997 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
998 | if (msg_type(hdr) == SYNCH_MSG) { | |
999 | __skb_queue_purge(&l->deferdq); | |
1000 | goto drop; | |
8b4ed863 | 1001 | } |
6e498158 JPM |
1002 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
1003 | return rc; | |
1004 | kfree_skb(skb); | |
1005 | skb = iskb; | |
1006 | hdr = buf_msg(skb); | |
1007 | if (less(msg_seqno(hdr), l->drop_point)) | |
1008 | goto drop; | |
9073fb8b | 1009 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
1010 | return rc; |
1011 | usr = msg_user(hdr); | |
1012 | reasm_skb = &l->failover_reasm_skb; | |
1013 | } | |
c637c103 | 1014 | |
6e498158 | 1015 | if (usr == MSG_BUNDLER) { |
9945e804 | 1016 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1017 | l->stats.recv_bundles++; |
1018 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1019 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1020 | tipc_data_input(l, iskb, &tmpq); |
1021 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1022 | return 0; |
6e498158 JPM |
1023 | } else if (usr == MSG_FRAGMENTER) { |
1024 | l->stats.recv_fragments++; | |
1025 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1026 | l->stats.recv_fragmented++; | |
9073fb8b | 1027 | tipc_data_input(l, skb, inputq); |
6e498158 | 1028 | } else if (!*reasm_skb) { |
662921cd | 1029 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1030 | } |
662921cd | 1031 | return 0; |
6e498158 | 1032 | } else if (usr == BCAST_PROTOCOL) { |
c637c103 | 1033 | tipc_link_sync_rcv(node, skb); |
662921cd | 1034 | return 0; |
6e498158 JPM |
1035 | } |
1036 | drop: | |
1037 | kfree_skb(skb); | |
662921cd | 1038 | return 0; |
7ae934be EH |
1039 | } |
1040 | ||
d999297c JPM |
1041 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1042 | { | |
1043 | bool released = false; | |
1044 | struct sk_buff *skb, *tmp; | |
1045 | ||
1046 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1047 | if (more(buf_seqno(skb), acked)) | |
1048 | break; | |
1049 | __skb_unlink(skb, &l->transmq); | |
1050 | kfree_skb(skb); | |
1051 | released = true; | |
1052 | } | |
1053 | return released; | |
1054 | } | |
1055 | ||
f9aa358a JPM |
1056 | /* tipc_link_build_ack_msg: prepare link acknowledge message for transmission |
1057 | */ | |
1058 | void tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1059 | { | |
1060 | l->rcv_unacked = 0; | |
1061 | l->stats.sent_acks++; | |
1062 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
1063 | } | |
1064 | ||
1065 | /* tipc_link_build_nack_msg: prepare link nack message for transmission | |
1066 | */ | |
1067 | static void tipc_link_build_nack_msg(struct tipc_link *l, | |
1068 | struct sk_buff_head *xmitq) | |
1069 | { | |
1070 | u32 def_cnt = ++l->stats.deferred_recv; | |
1071 | ||
1072 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) | |
1073 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
1074 | } | |
1075 | ||
d999297c | 1076 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1077 | * @l: the link that should handle the message |
d999297c JPM |
1078 | * @skb: TIPC packet |
1079 | * @xmitq: queue to place packets to be sent after this call | |
1080 | */ | |
1081 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1082 | struct sk_buff_head *xmitq) | |
1083 | { | |
f9aa358a | 1084 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1085 | struct tipc_msg *hdr; |
81204c49 | 1086 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1087 | int rc = 0; |
1088 | ||
f9aa358a | 1089 | do { |
d999297c | 1090 | hdr = buf_msg(skb); |
f9aa358a JPM |
1091 | seqno = msg_seqno(hdr); |
1092 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1093 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1094 | |
1095 | /* Verify and update link state */ | |
f9aa358a JPM |
1096 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1097 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1098 | |
662921cd | 1099 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1100 | if (l->state == LINK_ESTABLISHING) |
1101 | rc = TIPC_LINK_UP_EVT; | |
1102 | goto drop; | |
d999297c JPM |
1103 | } |
1104 | ||
f9aa358a | 1105 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1106 | l->silent_intv_cnt = 0; |
1107 | ||
81204c49 JPM |
1108 | /* Drop if outside receive window */ |
1109 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1110 | l->stats.duplicates++; | |
1111 | goto drop; | |
1112 | } | |
1113 | ||
d999297c JPM |
1114 | /* Forward queues and wake up waiting users */ |
1115 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1116 | tipc_link_advance_backlog(l, xmitq); | |
1117 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1118 | link_prepare_wakeup(l); | |
1119 | } | |
1120 | ||
81204c49 JPM |
1121 | /* Defer delivery if sequence gap */ |
1122 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1123 | __tipc_skb_queue_sorted(defq, seqno, skb); |
f9aa358a JPM |
1124 | tipc_link_build_nack_msg(l, xmitq); |
1125 | break; | |
d999297c JPM |
1126 | } |
1127 | ||
81204c49 | 1128 | /* Deliver packet */ |
d999297c JPM |
1129 | l->rcv_nxt++; |
1130 | l->stats.recv_info++; | |
f9aa358a | 1131 | if (!tipc_data_input(l, skb, l->inputq)) |
9945e804 | 1132 | rc = tipc_link_input(l, skb, l->inputq); |
81204c49 | 1133 | if (unlikely(rc)) |
f9aa358a | 1134 | break; |
f9aa358a JPM |
1135 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
1136 | tipc_link_build_ack_msg(l, xmitq); | |
1137 | ||
1138 | } while ((skb = __skb_dequeue(defq))); | |
1139 | ||
1140 | return rc; | |
1141 | drop: | |
1142 | kfree_skb(skb); | |
d999297c JPM |
1143 | return rc; |
1144 | } | |
1145 | ||
2c53040f | 1146 | /** |
8809b255 AS |
1147 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1148 | * | |
1149 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1150 | */ |
bc6fecd4 | 1151 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1152 | { |
bc6fecd4 | 1153 | struct sk_buff *skb1; |
e4bf4f76 | 1154 | u16 seq_no = buf_seqno(skb); |
b97bf3fd PL |
1155 | |
1156 | /* Empty queue ? */ | |
bc6fecd4 YX |
1157 | if (skb_queue_empty(list)) { |
1158 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1159 | return 1; |
1160 | } | |
1161 | ||
1162 | /* Last ? */ | |
bc6fecd4 YX |
1163 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1164 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1165 | return 1; |
1166 | } | |
1167 | ||
8809b255 | 1168 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 | 1169 | skb_queue_walk(list, skb1) { |
e4bf4f76 | 1170 | u16 curr_seqno = buf_seqno(skb1); |
b97bf3fd | 1171 | |
8809b255 | 1172 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1173 | kfree_skb(skb); |
8809b255 | 1174 | return 0; |
b97bf3fd | 1175 | } |
8809b255 AS |
1176 | |
1177 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1178 | break; |
8809b255 | 1179 | } |
b97bf3fd | 1180 | |
bc6fecd4 | 1181 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1182 | return 1; |
b97bf3fd PL |
1183 | } |
1184 | ||
b97bf3fd PL |
1185 | /* |
1186 | * Send protocol message to the other endpoint. | |
1187 | */ | |
426cc2b8 | 1188 | void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg, |
ed193ece | 1189 | u32 gap, u32 tolerance, u32 priority) |
b97bf3fd | 1190 | { |
426cc2b8 JPM |
1191 | struct sk_buff *skb = NULL; |
1192 | struct sk_buff_head xmitq; | |
b97bf3fd | 1193 | |
426cc2b8 JPM |
1194 | __skb_queue_head_init(&xmitq); |
1195 | tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap, | |
1196 | tolerance, priority, &xmitq); | |
1197 | skb = __skb_dequeue(&xmitq); | |
1198 | if (!skb) | |
b97bf3fd | 1199 | return; |
440d8963 | 1200 | tipc_bearer_send(l->owner->net, l->bearer_id, skb, l->media_addr); |
426cc2b8 JPM |
1201 | l->rcv_unacked = 0; |
1202 | kfree_skb(skb); | |
b97bf3fd PL |
1203 | } |
1204 | ||
426cc2b8 JPM |
1205 | /* tipc_link_build_proto_msg: prepare link protocol message for transmission |
1206 | */ | |
1207 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, | |
1208 | u16 rcvgap, int tolerance, int priority, | |
1209 | struct sk_buff_head *xmitq) | |
1210 | { | |
1211 | struct sk_buff *skb = NULL; | |
1212 | struct tipc_msg *hdr = l->pmsg; | |
1213 | u16 snd_nxt = l->snd_nxt; | |
1214 | u16 rcv_nxt = l->rcv_nxt; | |
1215 | u16 rcv_last = rcv_nxt - 1; | |
1216 | int node_up = l->owner->bclink.recv_permitted; | |
1217 | ||
1218 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1219 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1220 | return; |
1221 | ||
426cc2b8 JPM |
1222 | msg_set_type(hdr, mtyp); |
1223 | msg_set_net_plane(hdr, l->net_plane); | |
1224 | msg_set_bcast_ack(hdr, l->owner->bclink.last_in); | |
1225 | msg_set_last_bcast(hdr, tipc_bclink_get_last_sent(l->owner->net)); | |
1226 | msg_set_link_tolerance(hdr, tolerance); | |
1227 | msg_set_linkprio(hdr, priority); | |
1228 | msg_set_redundant_link(hdr, node_up); | |
1229 | msg_set_seq_gap(hdr, 0); | |
1230 | ||
1231 | /* Compatibility: created msg must not be in sequence with pkt flow */ | |
1232 | msg_set_seqno(hdr, snd_nxt + U16_MAX / 2); | |
1233 | ||
1234 | if (mtyp == STATE_MSG) { | |
1235 | if (!tipc_link_is_up(l)) | |
1236 | return; | |
1237 | msg_set_next_sent(hdr, snd_nxt); | |
1238 | ||
1239 | /* Override rcvgap if there are packets in deferred queue */ | |
1240 | if (!skb_queue_empty(&l->deferdq)) | |
1241 | rcvgap = buf_seqno(skb_peek(&l->deferdq)) - rcv_nxt; | |
1242 | if (rcvgap) { | |
1243 | msg_set_seq_gap(hdr, rcvgap); | |
1244 | l->stats.sent_nacks++; | |
1245 | } | |
1246 | msg_set_ack(hdr, rcv_last); | |
1247 | msg_set_probe(hdr, probe); | |
1248 | if (probe) | |
1249 | l->stats.sent_probes++; | |
1250 | l->stats.sent_states++; | |
1251 | } else { | |
1252 | /* RESET_MSG or ACTIVATE_MSG */ | |
1253 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
6e498158 | 1254 | msg_set_ack(hdr, l->rcv_nxt - 1); |
426cc2b8 JPM |
1255 | msg_set_next_sent(hdr, 1); |
1256 | } | |
1257 | skb = tipc_buf_acquire(msg_size(hdr)); | |
1258 | if (!skb) | |
1259 | return; | |
1260 | skb_copy_to_linear_data(skb, hdr, msg_size(hdr)); | |
1261 | skb->priority = TC_PRIO_CONTROL; | |
6e498158 | 1262 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1263 | } |
1264 | ||
6e498158 | 1265 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1266 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1267 | */ |
6e498158 JPM |
1268 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1269 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1270 | { |
6e498158 JPM |
1271 | struct sk_buff *skb, *tnlskb; |
1272 | struct tipc_msg *hdr, tnlhdr; | |
1273 | struct sk_buff_head *queue = &l->transmq; | |
1274 | struct sk_buff_head tmpxq, tnlq; | |
1275 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1276 | |
6e498158 | 1277 | if (!tnl) |
b97bf3fd PL |
1278 | return; |
1279 | ||
6e498158 JPM |
1280 | skb_queue_head_init(&tnlq); |
1281 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1282 | |
6e498158 JPM |
1283 | /* At least one packet required for safe algorithm => add dummy */ |
1284 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1285 | BASIC_H_SIZE, 0, l->addr, link_own_addr(l), | |
1286 | 0, 0, TIPC_ERR_NO_PORT); | |
1287 | if (!skb) { | |
1288 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1289 | return; |
1290 | } | |
6e498158 JPM |
1291 | skb_queue_tail(&tnlq, skb); |
1292 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1293 | __skb_queue_purge(&tmpxq); | |
1294 | ||
1295 | /* Initialize reusable tunnel packet header */ | |
1296 | tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL, | |
1297 | mtyp, INT_H_SIZE, l->addr); | |
1298 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1299 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1300 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1301 | tnl: | |
1302 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1303 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1304 | hdr = buf_msg(skb); |
1305 | if (queue == &l->backlogq) | |
1306 | msg_set_seqno(hdr, seqno++); | |
1307 | pktlen = msg_size(hdr); | |
1308 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
1309 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE); | |
1310 | if (!tnlskb) { | |
1311 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1312 | return; |
1313 | } | |
6e498158 JPM |
1314 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1315 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1316 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1317 | } |
6e498158 JPM |
1318 | if (queue != &l->backlogq) { |
1319 | queue = &l->backlogq; | |
1320 | goto tnl; | |
f006c9c7 | 1321 | } |
1dab3d5a | 1322 | |
6e498158 | 1323 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1324 | |
6e498158 JPM |
1325 | if (mtyp == FAILOVER_MSG) { |
1326 | tnl->drop_point = l->rcv_nxt; | |
1327 | tnl->failover_reasm_skb = l->reasm_buf; | |
1328 | l->reasm_buf = NULL; | |
2da71425 | 1329 | } |
b97bf3fd PL |
1330 | } |
1331 | ||
d999297c JPM |
1332 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1333 | * Note that network plane id propagates through the network, and may | |
1334 | * change at any time. The node with lowest numerical id determines | |
1335 | * network plane | |
1336 | */ | |
1337 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1338 | struct sk_buff_head *xmitq) | |
1339 | { | |
1340 | struct tipc_msg *hdr = buf_msg(skb); | |
1341 | u16 rcvgap = 0; | |
1342 | u16 nacked_gap = msg_seq_gap(hdr); | |
1343 | u16 peers_snd_nxt = msg_next_sent(hdr); | |
1344 | u16 peers_tol = msg_link_tolerance(hdr); | |
1345 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1346 | u16 rcv_nxt = l->rcv_nxt; |
73f646ce | 1347 | int mtyp = msg_type(hdr); |
d999297c JPM |
1348 | char *if_name; |
1349 | int rc = 0; | |
1350 | ||
662921cd | 1351 | if (tipc_link_is_blocked(l)) |
d999297c JPM |
1352 | goto exit; |
1353 | ||
1354 | if (link_own_addr(l) > msg_prevnode(hdr)) | |
1355 | l->net_plane = msg_net_plane(hdr); | |
1356 | ||
73f646ce | 1357 | switch (mtyp) { |
d999297c JPM |
1358 | case RESET_MSG: |
1359 | ||
1360 | /* Ignore duplicate RESET with old session number */ | |
1361 | if ((less_eq(msg_session(hdr), l->peer_session)) && | |
1362 | (l->peer_session != WILDCARD_SESSION)) | |
1363 | break; | |
1364 | /* fall thru' */ | |
662921cd | 1365 | |
d999297c JPM |
1366 | case ACTIVATE_MSG: |
1367 | ||
1368 | /* Complete own link name with peer's interface name */ | |
1369 | if_name = strrchr(l->name, ':') + 1; | |
1370 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1371 | break; | |
1372 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1373 | break; | |
1374 | strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME); | |
1375 | ||
1376 | /* Update own tolerance if peer indicates a non-zero value */ | |
1377 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1378 | l->tolerance = peers_tol; | |
1379 | ||
1380 | /* Update own priority if peer's priority is higher */ | |
1381 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1382 | l->priority = peers_prio; | |
1383 | ||
73f646ce JPM |
1384 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
1385 | if ((mtyp == RESET_MSG) || !link_is_up(l)) | |
1386 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); | |
1387 | ||
1388 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
1389 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) | |
1390 | rc = TIPC_LINK_UP_EVT; | |
1391 | ||
d999297c JPM |
1392 | l->peer_session = msg_session(hdr); |
1393 | l->peer_bearer_id = msg_bearer_id(hdr); | |
d999297c JPM |
1394 | if (l->mtu > msg_max_pkt(hdr)) |
1395 | l->mtu = msg_max_pkt(hdr); | |
1396 | break; | |
662921cd | 1397 | |
d999297c | 1398 | case STATE_MSG: |
662921cd | 1399 | |
d999297c JPM |
1400 | /* Update own tolerance if peer indicates a non-zero value */ |
1401 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1402 | l->tolerance = peers_tol; | |
1403 | ||
1404 | l->silent_intv_cnt = 0; | |
1405 | l->stats.recv_states++; | |
1406 | if (msg_probe(hdr)) | |
1407 | l->stats.recv_probes++; | |
73f646ce JPM |
1408 | |
1409 | if (!link_is_up(l)) { | |
1410 | if (l->state == LINK_ESTABLISHING) | |
1411 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1412 | break; |
73f646ce | 1413 | } |
d999297c | 1414 | |
662921cd | 1415 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1416 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c JPM |
1417 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
1418 | if (rcvgap || (msg_probe(hdr))) | |
1419 | tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap, | |
16040894 | 1420 | 0, 0, xmitq); |
d999297c JPM |
1421 | tipc_link_release_pkts(l, msg_ack(hdr)); |
1422 | ||
1423 | /* If NACK, retransmit will now start at right position */ | |
1424 | if (nacked_gap) { | |
6e498158 | 1425 | rc = tipc_link_retransm(l, nacked_gap, xmitq); |
d999297c JPM |
1426 | l->stats.recv_nacks++; |
1427 | } | |
662921cd | 1428 | |
d999297c JPM |
1429 | tipc_link_advance_backlog(l, xmitq); |
1430 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1431 | link_prepare_wakeup(l); | |
1432 | } | |
1433 | exit: | |
1434 | kfree_skb(skb); | |
1435 | return rc; | |
1436 | } | |
1437 | ||
e3eea1eb | 1438 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1439 | { |
ed193ece | 1440 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1441 | |
1442 | l->window = win; | |
1f66d161 JPM |
1443 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1444 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1445 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1446 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1447 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1448 | } |
1449 | ||
e099e86c | 1450 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1451 | * @net: the applicable net namespace |
e099e86c JPM |
1452 | * @name: pointer to link name string |
1453 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1454 | * |
e099e86c | 1455 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1456 | */ |
f2f9800d YX |
1457 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1458 | const char *link_name, | |
e099e86c | 1459 | unsigned int *bearer_id) |
b97bf3fd | 1460 | { |
f2f9800d | 1461 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1462 | struct tipc_link *l_ptr; |
bbfbe47c | 1463 | struct tipc_node *n_ptr; |
886eaa1f | 1464 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1465 | int i; |
b97bf3fd | 1466 | |
e099e86c | 1467 | *bearer_id = 0; |
6c7a762e | 1468 | rcu_read_lock(); |
f2f9800d | 1469 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1470 | tipc_node_lock(n_ptr); |
bbfbe47c | 1471 | for (i = 0; i < MAX_BEARERS; i++) { |
9d13ec65 | 1472 | l_ptr = n_ptr->links[i].link; |
e099e86c JPM |
1473 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1474 | *bearer_id = i; | |
1475 | found_node = n_ptr; | |
1476 | break; | |
1477 | } | |
bbfbe47c | 1478 | } |
a11607f5 | 1479 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1480 | if (found_node) |
1481 | break; | |
bbfbe47c | 1482 | } |
6c7a762e YX |
1483 | rcu_read_unlock(); |
1484 | ||
e099e86c | 1485 | return found_node; |
b97bf3fd PL |
1486 | } |
1487 | ||
b97bf3fd PL |
1488 | /** |
1489 | * link_reset_statistics - reset link statistics | |
1490 | * @l_ptr: pointer to link | |
1491 | */ | |
a18c4bc3 | 1492 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1493 | { |
1494 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
a97b9d3f JPM |
1495 | l_ptr->stats.sent_info = l_ptr->snd_nxt; |
1496 | l_ptr->stats.recv_info = l_ptr->rcv_nxt; | |
b97bf3fd PL |
1497 | } |
1498 | ||
1a20cc25 | 1499 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1500 | { |
1a20cc25 JPM |
1501 | struct sk_buff *hskb = skb_peek(&l->transmq); |
1502 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt; | |
1503 | u16 tail = l->snd_nxt - 1; | |
7a2f7d18 | 1504 | |
662921cd | 1505 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1506 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1507 | skb_queue_len(&l->transmq), head, tail, | |
1508 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1509 | } |
0655f6a8 RA |
1510 | |
1511 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1512 | */ | |
1513 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1514 | { | |
1515 | int err; | |
1516 | ||
1517 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1518 | tipc_nl_prop_policy); | |
1519 | if (err) | |
1520 | return err; | |
1521 | ||
1522 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1523 | u32 prio; | |
1524 | ||
1525 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1526 | if (prio > TIPC_MAX_LINK_PRI) | |
1527 | return -EINVAL; | |
1528 | } | |
1529 | ||
1530 | if (props[TIPC_NLA_PROP_TOL]) { | |
1531 | u32 tol; | |
1532 | ||
1533 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1534 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1535 | return -EINVAL; | |
1536 | } | |
1537 | ||
1538 | if (props[TIPC_NLA_PROP_WIN]) { | |
1539 | u32 win; | |
1540 | ||
1541 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1542 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1543 | return -EINVAL; | |
1544 | } | |
1545 | ||
1546 | return 0; | |
1547 | } | |
7be57fc6 | 1548 | |
f96ce7a2 RA |
1549 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
1550 | { | |
1551 | int err; | |
1552 | int res = 0; | |
1553 | int bearer_id; | |
1554 | char *name; | |
1555 | struct tipc_link *link; | |
1556 | struct tipc_node *node; | |
1557 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
37e2d484 | 1558 | struct net *net = sock_net(skb->sk); |
f96ce7a2 RA |
1559 | |
1560 | if (!info->attrs[TIPC_NLA_LINK]) | |
1561 | return -EINVAL; | |
1562 | ||
1563 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1564 | info->attrs[TIPC_NLA_LINK], | |
1565 | tipc_nl_link_policy); | |
1566 | if (err) | |
1567 | return err; | |
1568 | ||
1569 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1570 | return -EINVAL; | |
1571 | ||
1572 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1573 | ||
670f4f88 RA |
1574 | if (strcmp(name, tipc_bclink_name) == 0) |
1575 | return tipc_nl_bc_link_set(net, attrs); | |
1576 | ||
f2f9800d | 1577 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
1578 | if (!node) |
1579 | return -EINVAL; | |
1580 | ||
1581 | tipc_node_lock(node); | |
1582 | ||
9d13ec65 | 1583 | link = node->links[bearer_id].link; |
f96ce7a2 RA |
1584 | if (!link) { |
1585 | res = -EINVAL; | |
1586 | goto out; | |
1587 | } | |
1588 | ||
1589 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
1590 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
1591 | ||
1592 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
1593 | props); | |
1594 | if (err) { | |
1595 | res = err; | |
1596 | goto out; | |
1597 | } | |
1598 | ||
1599 | if (props[TIPC_NLA_PROP_TOL]) { | |
1600 | u32 tol; | |
1601 | ||
1602 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
8a1577c9 | 1603 | link->tolerance = tol; |
ed193ece | 1604 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0); |
f96ce7a2 RA |
1605 | } |
1606 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1607 | u32 prio; | |
1608 | ||
1609 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1610 | link->priority = prio; | |
ed193ece | 1611 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio); |
f96ce7a2 RA |
1612 | } |
1613 | if (props[TIPC_NLA_PROP_WIN]) { | |
1614 | u32 win; | |
1615 | ||
1616 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1617 | tipc_link_set_queue_limits(link, win); | |
1618 | } | |
1619 | } | |
1620 | ||
1621 | out: | |
1622 | tipc_node_unlock(node); | |
1623 | ||
1624 | return res; | |
1625 | } | |
d8182804 RA |
1626 | |
1627 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
1628 | { |
1629 | int i; | |
1630 | struct nlattr *stats; | |
1631 | ||
1632 | struct nla_map { | |
1633 | u32 key; | |
1634 | u32 val; | |
1635 | }; | |
1636 | ||
1637 | struct nla_map map[] = { | |
1638 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1639 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1640 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1641 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1642 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
1643 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
1644 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
1645 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1646 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1647 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1648 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1649 | s->msg_length_counts : 1}, | |
1650 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1651 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1652 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1653 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1654 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1655 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1656 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1657 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1658 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1659 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1660 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1661 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1662 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1663 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1664 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1665 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1666 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1667 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1668 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1669 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1670 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1671 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1672 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1673 | }; | |
1674 | ||
1675 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1676 | if (!stats) | |
1677 | return -EMSGSIZE; | |
1678 | ||
1679 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1680 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1681 | goto msg_full; | |
1682 | ||
1683 | nla_nest_end(skb, stats); | |
1684 | ||
1685 | return 0; | |
1686 | msg_full: | |
1687 | nla_nest_cancel(skb, stats); | |
1688 | ||
1689 | return -EMSGSIZE; | |
1690 | } | |
1691 | ||
1692 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 | 1693 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
f2f67390 | 1694 | struct tipc_link *link, int nlflags) |
7be57fc6 RA |
1695 | { |
1696 | int err; | |
1697 | void *hdr; | |
1698 | struct nlattr *attrs; | |
1699 | struct nlattr *prop; | |
34747539 | 1700 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 1701 | |
bfb3e5dd | 1702 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1703 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1704 | if (!hdr) |
1705 | return -EMSGSIZE; | |
1706 | ||
1707 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1708 | if (!attrs) | |
1709 | goto msg_full; | |
1710 | ||
1711 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
1712 | goto attr_msg_full; | |
1713 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 1714 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 1715 | goto attr_msg_full; |
ed193ece | 1716 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 1717 | goto attr_msg_full; |
a97b9d3f | 1718 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
7be57fc6 | 1719 | goto attr_msg_full; |
a97b9d3f | 1720 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
7be57fc6 RA |
1721 | goto attr_msg_full; |
1722 | ||
1723 | if (tipc_link_is_up(link)) | |
1724 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1725 | goto attr_msg_full; | |
1726 | if (tipc_link_is_active(link)) | |
1727 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
1728 | goto attr_msg_full; | |
1729 | ||
1730 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1731 | if (!prop) | |
1732 | goto attr_msg_full; | |
1733 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1734 | goto prop_msg_full; | |
1735 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
1736 | goto prop_msg_full; | |
1737 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 1738 | link->window)) |
7be57fc6 RA |
1739 | goto prop_msg_full; |
1740 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1741 | goto prop_msg_full; | |
1742 | nla_nest_end(msg->skb, prop); | |
1743 | ||
1744 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
1745 | if (err) | |
1746 | goto attr_msg_full; | |
1747 | ||
1748 | nla_nest_end(msg->skb, attrs); | |
1749 | genlmsg_end(msg->skb, hdr); | |
1750 | ||
1751 | return 0; | |
1752 | ||
1753 | prop_msg_full: | |
1754 | nla_nest_cancel(msg->skb, prop); | |
1755 | attr_msg_full: | |
1756 | nla_nest_cancel(msg->skb, attrs); | |
1757 | msg_full: | |
1758 | genlmsg_cancel(msg->skb, hdr); | |
1759 | ||
1760 | return -EMSGSIZE; | |
1761 | } | |
1762 | ||
1763 | /* Caller should hold node lock */ | |
34747539 YX |
1764 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
1765 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
1766 | { |
1767 | u32 i; | |
1768 | int err; | |
1769 | ||
1770 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
1771 | *prev_link = i; | |
1772 | ||
9d13ec65 | 1773 | if (!node->links[i].link) |
7be57fc6 RA |
1774 | continue; |
1775 | ||
9d13ec65 JPM |
1776 | err = __tipc_nl_add_link(net, msg, |
1777 | node->links[i].link, NLM_F_MULTI); | |
7be57fc6 RA |
1778 | if (err) |
1779 | return err; | |
1780 | } | |
1781 | *prev_link = 0; | |
1782 | ||
1783 | return 0; | |
1784 | } | |
1785 | ||
1786 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1787 | { | |
f2f9800d YX |
1788 | struct net *net = sock_net(skb->sk); |
1789 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
1790 | struct tipc_node *node; |
1791 | struct tipc_nl_msg msg; | |
1792 | u32 prev_node = cb->args[0]; | |
1793 | u32 prev_link = cb->args[1]; | |
1794 | int done = cb->args[2]; | |
1795 | int err; | |
1796 | ||
1797 | if (done) | |
1798 | return 0; | |
1799 | ||
1800 | msg.skb = skb; | |
1801 | msg.portid = NETLINK_CB(cb->skb).portid; | |
1802 | msg.seq = cb->nlh->nlmsg_seq; | |
1803 | ||
1804 | rcu_read_lock(); | |
7be57fc6 | 1805 | if (prev_node) { |
f2f9800d | 1806 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
1807 | if (!node) { |
1808 | /* We never set seq or call nl_dump_check_consistent() | |
1809 | * this means that setting prev_seq here will cause the | |
1810 | * consistence check to fail in the netlink callback | |
1811 | * handler. Resulting in the last NLMSG_DONE message | |
1812 | * having the NLM_F_DUMP_INTR flag set. | |
1813 | */ | |
1814 | cb->prev_seq = 1; | |
1815 | goto out; | |
1816 | } | |
8a0f6ebe | 1817 | tipc_node_put(node); |
7be57fc6 | 1818 | |
f2f9800d YX |
1819 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
1820 | list) { | |
7be57fc6 | 1821 | tipc_node_lock(node); |
34747539 YX |
1822 | err = __tipc_nl_add_node_links(net, &msg, node, |
1823 | &prev_link); | |
7be57fc6 RA |
1824 | tipc_node_unlock(node); |
1825 | if (err) | |
1826 | goto out; | |
1827 | ||
1828 | prev_node = node->addr; | |
1829 | } | |
1830 | } else { | |
1da46568 | 1831 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
1832 | if (err) |
1833 | goto out; | |
1834 | ||
f2f9800d | 1835 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 1836 | tipc_node_lock(node); |
34747539 YX |
1837 | err = __tipc_nl_add_node_links(net, &msg, node, |
1838 | &prev_link); | |
7be57fc6 RA |
1839 | tipc_node_unlock(node); |
1840 | if (err) | |
1841 | goto out; | |
1842 | ||
1843 | prev_node = node->addr; | |
1844 | } | |
1845 | } | |
1846 | done = 1; | |
1847 | out: | |
1848 | rcu_read_unlock(); | |
1849 | ||
1850 | cb->args[0] = prev_node; | |
1851 | cb->args[1] = prev_link; | |
1852 | cb->args[2] = done; | |
1853 | ||
1854 | return skb->len; | |
1855 | } | |
1856 | ||
1857 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
1858 | { | |
f2f9800d | 1859 | struct net *net = genl_info_net(info); |
7be57fc6 | 1860 | struct tipc_nl_msg msg; |
7be57fc6 | 1861 | char *name; |
7be57fc6 RA |
1862 | int err; |
1863 | ||
670f4f88 RA |
1864 | msg.portid = info->snd_portid; |
1865 | msg.seq = info->snd_seq; | |
1866 | ||
7be57fc6 RA |
1867 | if (!info->attrs[TIPC_NLA_LINK_NAME]) |
1868 | return -EINVAL; | |
7be57fc6 | 1869 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); |
7be57fc6 | 1870 | |
670f4f88 RA |
1871 | msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1872 | if (!msg.skb) | |
7be57fc6 RA |
1873 | return -ENOMEM; |
1874 | ||
670f4f88 RA |
1875 | if (strcmp(name, tipc_bclink_name) == 0) { |
1876 | err = tipc_nl_add_bc_link(net, &msg); | |
1877 | if (err) { | |
1878 | nlmsg_free(msg.skb); | |
1879 | return err; | |
1880 | } | |
1881 | } else { | |
1882 | int bearer_id; | |
1883 | struct tipc_node *node; | |
1884 | struct tipc_link *link; | |
7be57fc6 | 1885 | |
670f4f88 RA |
1886 | node = tipc_link_find_owner(net, name, &bearer_id); |
1887 | if (!node) | |
1888 | return -EINVAL; | |
7be57fc6 | 1889 | |
670f4f88 | 1890 | tipc_node_lock(node); |
9d13ec65 | 1891 | link = node->links[bearer_id].link; |
670f4f88 RA |
1892 | if (!link) { |
1893 | tipc_node_unlock(node); | |
1894 | nlmsg_free(msg.skb); | |
1895 | return -EINVAL; | |
1896 | } | |
7be57fc6 | 1897 | |
670f4f88 RA |
1898 | err = __tipc_nl_add_link(net, &msg, link, 0); |
1899 | tipc_node_unlock(node); | |
1900 | if (err) { | |
1901 | nlmsg_free(msg.skb); | |
1902 | return err; | |
1903 | } | |
1904 | } | |
7be57fc6 | 1905 | |
670f4f88 | 1906 | return genlmsg_reply(msg.skb, info); |
7be57fc6 | 1907 | } |
ae36342b RA |
1908 | |
1909 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
1910 | { | |
1911 | int err; | |
1912 | char *link_name; | |
1913 | unsigned int bearer_id; | |
1914 | struct tipc_link *link; | |
1915 | struct tipc_node *node; | |
1916 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
1817877b | 1917 | struct net *net = sock_net(skb->sk); |
ae36342b RA |
1918 | |
1919 | if (!info->attrs[TIPC_NLA_LINK]) | |
1920 | return -EINVAL; | |
1921 | ||
1922 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1923 | info->attrs[TIPC_NLA_LINK], | |
1924 | tipc_nl_link_policy); | |
1925 | if (err) | |
1926 | return err; | |
1927 | ||
1928 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1929 | return -EINVAL; | |
1930 | ||
1931 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1932 | ||
1933 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 1934 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
1935 | if (err) |
1936 | return err; | |
1937 | return 0; | |
1938 | } | |
1939 | ||
f2f9800d | 1940 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
1941 | if (!node) |
1942 | return -EINVAL; | |
1943 | ||
1944 | tipc_node_lock(node); | |
1945 | ||
9d13ec65 | 1946 | link = node->links[bearer_id].link; |
ae36342b RA |
1947 | if (!link) { |
1948 | tipc_node_unlock(node); | |
1949 | return -EINVAL; | |
1950 | } | |
1951 | ||
1952 | link_reset_statistics(link); | |
1953 | ||
1954 | tipc_node_unlock(node); | |
1955 | ||
1956 | return 0; | |
1957 | } |