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Commit | Line | Data |
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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 "; |
32301906 | 53 | static const char tipc_bclink_name[] = "broadcast-link"; |
b97bf3fd | 54 | |
7be57fc6 RA |
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 | ||
0655f6a8 RA |
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 | ||
d999297c JPM |
79 | /* |
80 | * Interval between NACKs when packets arrive out of order | |
81 | */ | |
82 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
a686e685 AS |
83 | /* |
84 | * Out-of-range value for link session numbers | |
85 | */ | |
d3504c34 | 86 | #define WILDCARD_SESSION 0x10000 |
a686e685 | 87 | |
662921cd | 88 | /* Link FSM states: |
b97bf3fd | 89 | */ |
d3504c34 | 90 | enum { |
662921cd JPM |
91 | LINK_ESTABLISHED = 0xe, |
92 | LINK_ESTABLISHING = 0xe << 4, | |
93 | LINK_RESET = 0x1 << 8, | |
94 | LINK_RESETTING = 0x2 << 12, | |
95 | LINK_PEER_RESET = 0xd << 16, | |
96 | LINK_FAILINGOVER = 0xf << 20, | |
97 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
98 | }; |
99 | ||
100 | /* Link FSM state checking routines | |
101 | */ | |
662921cd | 102 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 103 | { |
662921cd | 104 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 105 | } |
b97bf3fd | 106 | |
d999297c JPM |
107 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
108 | struct sk_buff_head *xmitq); | |
426cc2b8 JPM |
109 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
110 | u16 rcvgap, int tolerance, int priority, | |
111 | struct sk_buff_head *xmitq); | |
a18c4bc3 PG |
112 | static void link_reset_statistics(struct tipc_link *l_ptr); |
113 | static void link_print(struct tipc_link *l_ptr, const char *str); | |
247f0f3c | 114 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf); |
8b4ed863 | 115 | |
b97bf3fd | 116 | /* |
05790c64 | 117 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 118 | */ |
662921cd | 119 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 120 | { |
662921cd JPM |
121 | return link_is_up(l); |
122 | } | |
123 | ||
c8199300 JPM |
124 | bool tipc_link_peer_is_down(struct tipc_link *l) |
125 | { | |
126 | return l->state == LINK_PEER_RESET; | |
127 | } | |
128 | ||
662921cd JPM |
129 | bool tipc_link_is_reset(struct tipc_link *l) |
130 | { | |
131 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
132 | } | |
133 | ||
73f646ce JPM |
134 | bool tipc_link_is_establishing(struct tipc_link *l) |
135 | { | |
136 | return l->state == LINK_ESTABLISHING; | |
137 | } | |
138 | ||
662921cd JPM |
139 | bool tipc_link_is_synching(struct tipc_link *l) |
140 | { | |
141 | return l->state == LINK_SYNCHING; | |
142 | } | |
143 | ||
144 | bool tipc_link_is_failingover(struct tipc_link *l) | |
145 | { | |
146 | return l->state == LINK_FAILINGOVER; | |
147 | } | |
148 | ||
149 | bool tipc_link_is_blocked(struct tipc_link *l) | |
150 | { | |
151 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
152 | } |
153 | ||
9d13ec65 | 154 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 155 | { |
9d13ec65 JPM |
156 | struct tipc_node *n = l->owner; |
157 | ||
158 | return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l); | |
b97bf3fd PL |
159 | } |
160 | ||
440d8963 JPM |
161 | static u32 link_own_addr(struct tipc_link *l) |
162 | { | |
163 | return msg_prevnode(l->pmsg); | |
164 | } | |
165 | ||
b97bf3fd | 166 | /** |
4323add6 | 167 | * tipc_link_create - create a new link |
440d8963 | 168 | * @n: pointer to associated node |
0e05498e JPM |
169 | * @if_name: associated interface name |
170 | * @bearer_id: id (index) of associated bearer | |
171 | * @tolerance: link tolerance to be used by link | |
172 | * @net_plane: network plane (A,B,c..) this link belongs to | |
173 | * @mtu: mtu to be advertised by link | |
174 | * @priority: priority to be used by link | |
175 | * @window: send window to be used by link | |
176 | * @session: session to be used by link | |
440d8963 | 177 | * @ownnode: identity of own node |
0e05498e | 178 | * @peer: node id of peer node |
440d8963 JPM |
179 | * @maddr: media address to be used |
180 | * @inputq: queue to put messages ready for delivery | |
181 | * @namedq: queue to put binding table update messages ready for delivery | |
182 | * @link: return value, pointer to put the created link | |
c4307285 | 183 | * |
440d8963 | 184 | * Returns true if link was created, otherwise false |
b97bf3fd | 185 | */ |
0e05498e JPM |
186 | bool tipc_link_create(struct tipc_node *n, char *if_name, int bearer_id, |
187 | int tolerance, char net_plane, u32 mtu, int priority, | |
188 | int window, u32 session, u32 ownnode, u32 peer, | |
189 | struct tipc_media_addr *maddr, | |
440d8963 JPM |
190 | struct sk_buff_head *inputq, struct sk_buff_head *namedq, |
191 | struct tipc_link **link) | |
b97bf3fd | 192 | { |
440d8963 JPM |
193 | struct tipc_link *l; |
194 | struct tipc_msg *hdr; | |
37b9c08a | 195 | |
440d8963 JPM |
196 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
197 | if (!l) | |
198 | return false; | |
199 | *link = l; | |
0e05498e JPM |
200 | l->pmsg = (struct tipc_msg *)&l->proto_msg; |
201 | hdr = l->pmsg; | |
202 | tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer); | |
203 | msg_set_size(hdr, sizeof(l->proto_msg)); | |
204 | msg_set_session(hdr, session); | |
205 | msg_set_bearer_id(hdr, l->bearer_id); | |
37b9c08a | 206 | |
440d8963 | 207 | /* Note: peer i/f name is completed by reset/activate message */ |
440d8963 JPM |
208 | sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
209 | tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode), | |
210 | if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
0e05498e | 211 | strcpy((char *)msg_data(hdr), if_name); |
b97bf3fd | 212 | |
440d8963 JPM |
213 | l->addr = peer; |
214 | l->media_addr = maddr; | |
215 | l->owner = n; | |
216 | l->peer_session = WILDCARD_SESSION; | |
0e05498e JPM |
217 | l->bearer_id = bearer_id; |
218 | l->tolerance = tolerance; | |
219 | l->net_plane = net_plane; | |
220 | l->advertised_mtu = mtu; | |
221 | l->mtu = mtu; | |
222 | l->priority = priority; | |
223 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 224 | l->ackers = 1; |
440d8963 JPM |
225 | l->inputq = inputq; |
226 | l->namedq = namedq; | |
227 | l->state = LINK_RESETTING; | |
440d8963 JPM |
228 | __skb_queue_head_init(&l->transmq); |
229 | __skb_queue_head_init(&l->backlogq); | |
230 | __skb_queue_head_init(&l->deferdq); | |
231 | skb_queue_head_init(&l->wakeupq); | |
232 | skb_queue_head_init(l->inputq); | |
233 | return true; | |
b97bf3fd PL |
234 | } |
235 | ||
32301906 JPM |
236 | /** |
237 | * tipc_link_bc_create - create new link to be used for broadcast | |
238 | * @n: pointer to associated node | |
239 | * @mtu: mtu to be used | |
240 | * @window: send window to be used | |
241 | * @inputq: queue to put messages ready for delivery | |
242 | * @namedq: queue to put binding table update messages ready for delivery | |
243 | * @link: return value, pointer to put the created link | |
244 | * | |
245 | * Returns true if link was created, otherwise false | |
246 | */ | |
247 | bool tipc_link_bc_create(struct tipc_node *n, int mtu, int window, | |
248 | struct sk_buff_head *inputq, | |
249 | struct sk_buff_head *namedq, | |
250 | struct tipc_link **link) | |
251 | { | |
252 | struct tipc_link *l; | |
253 | ||
254 | if (!tipc_link_create(n, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, | |
255 | 0, 0, 0, NULL, inputq, namedq, link)) | |
256 | return false; | |
257 | ||
258 | l = *link; | |
259 | strcpy(l->name, tipc_bclink_name); | |
260 | tipc_link_reset(l); | |
261 | return true; | |
262 | } | |
263 | ||
d999297c JPM |
264 | /* tipc_link_build_bcast_sync_msg() - synchronize broadcast link endpoints. |
265 | * | |
266 | * Give a newly added peer node the sequence number where it should | |
267 | * start receiving and acking broadcast packets. | |
268 | */ | |
5045f7b9 JPM |
269 | void tipc_link_build_bcast_sync_msg(struct tipc_link *l, |
270 | struct sk_buff_head *xmitq) | |
d999297c JPM |
271 | { |
272 | struct sk_buff *skb; | |
273 | struct sk_buff_head list; | |
5a4c3552 | 274 | u16 last_sent; |
d999297c JPM |
275 | |
276 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
277 | 0, l->addr, link_own_addr(l), 0, 0, 0); | |
278 | if (!skb) | |
279 | return; | |
5a4c3552 JM |
280 | last_sent = tipc_bclink_get_last_sent(l->owner->net); |
281 | msg_set_last_bcast(buf_msg(skb), last_sent); | |
d999297c JPM |
282 | __skb_queue_head_init(&list); |
283 | __skb_queue_tail(&list, skb); | |
284 | tipc_link_xmit(l, &list, xmitq); | |
285 | } | |
286 | ||
6ab30f9c JPM |
287 | /** |
288 | * tipc_link_fsm_evt - link finite state machine | |
289 | * @l: pointer to link | |
290 | * @evt: state machine event to be processed | |
6ab30f9c | 291 | */ |
662921cd | 292 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 293 | { |
5045f7b9 | 294 | int rc = 0; |
6ab30f9c JPM |
295 | |
296 | switch (l->state) { | |
662921cd | 297 | case LINK_RESETTING: |
6ab30f9c | 298 | switch (evt) { |
662921cd JPM |
299 | case LINK_PEER_RESET_EVT: |
300 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 301 | break; |
662921cd JPM |
302 | case LINK_RESET_EVT: |
303 | l->state = LINK_RESET; | |
304 | break; | |
305 | case LINK_FAILURE_EVT: | |
306 | case LINK_FAILOVER_BEGIN_EVT: | |
307 | case LINK_ESTABLISH_EVT: | |
308 | case LINK_FAILOVER_END_EVT: | |
309 | case LINK_SYNCH_BEGIN_EVT: | |
310 | case LINK_SYNCH_END_EVT: | |
311 | default: | |
312 | goto illegal_evt; | |
313 | } | |
314 | break; | |
315 | case LINK_RESET: | |
316 | switch (evt) { | |
317 | case LINK_PEER_RESET_EVT: | |
318 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 319 | break; |
662921cd JPM |
320 | case LINK_FAILOVER_BEGIN_EVT: |
321 | l->state = LINK_FAILINGOVER; | |
322 | case LINK_FAILURE_EVT: | |
323 | case LINK_RESET_EVT: | |
324 | case LINK_ESTABLISH_EVT: | |
325 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 326 | break; |
662921cd JPM |
327 | case LINK_SYNCH_BEGIN_EVT: |
328 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 329 | default: |
662921cd | 330 | goto illegal_evt; |
6ab30f9c JPM |
331 | } |
332 | break; | |
662921cd | 333 | case LINK_PEER_RESET: |
6ab30f9c | 334 | switch (evt) { |
662921cd JPM |
335 | case LINK_RESET_EVT: |
336 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 337 | break; |
662921cd JPM |
338 | case LINK_PEER_RESET_EVT: |
339 | case LINK_ESTABLISH_EVT: | |
340 | case LINK_FAILURE_EVT: | |
6ab30f9c | 341 | break; |
662921cd JPM |
342 | case LINK_SYNCH_BEGIN_EVT: |
343 | case LINK_SYNCH_END_EVT: | |
344 | case LINK_FAILOVER_BEGIN_EVT: | |
345 | case LINK_FAILOVER_END_EVT: | |
346 | default: | |
347 | goto illegal_evt; | |
348 | } | |
349 | break; | |
350 | case LINK_FAILINGOVER: | |
351 | switch (evt) { | |
352 | case LINK_FAILOVER_END_EVT: | |
353 | l->state = LINK_RESET; | |
6ab30f9c | 354 | break; |
662921cd JPM |
355 | case LINK_PEER_RESET_EVT: |
356 | case LINK_RESET_EVT: | |
357 | case LINK_ESTABLISH_EVT: | |
358 | case LINK_FAILURE_EVT: | |
359 | break; | |
360 | case LINK_FAILOVER_BEGIN_EVT: | |
361 | case LINK_SYNCH_BEGIN_EVT: | |
362 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 363 | default: |
662921cd | 364 | goto illegal_evt; |
6ab30f9c JPM |
365 | } |
366 | break; | |
662921cd | 367 | case LINK_ESTABLISHING: |
6ab30f9c | 368 | switch (evt) { |
662921cd JPM |
369 | case LINK_ESTABLISH_EVT: |
370 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 371 | break; |
662921cd JPM |
372 | case LINK_FAILOVER_BEGIN_EVT: |
373 | l->state = LINK_FAILINGOVER; | |
374 | break; | |
662921cd | 375 | case LINK_RESET_EVT: |
73f646ce JPM |
376 | l->state = LINK_RESET; |
377 | break; | |
662921cd | 378 | case LINK_FAILURE_EVT: |
73f646ce | 379 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
380 | case LINK_SYNCH_BEGIN_EVT: |
381 | case LINK_FAILOVER_END_EVT: | |
382 | break; | |
383 | case LINK_SYNCH_END_EVT: | |
384 | default: | |
385 | goto illegal_evt; | |
386 | } | |
387 | break; | |
388 | case LINK_ESTABLISHED: | |
389 | switch (evt) { | |
390 | case LINK_PEER_RESET_EVT: | |
391 | l->state = LINK_PEER_RESET; | |
392 | rc |= TIPC_LINK_DOWN_EVT; | |
393 | break; | |
394 | case LINK_FAILURE_EVT: | |
395 | l->state = LINK_RESETTING; | |
396 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 397 | break; |
662921cd JPM |
398 | case LINK_RESET_EVT: |
399 | l->state = LINK_RESET; | |
6ab30f9c | 400 | break; |
662921cd | 401 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 402 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 403 | break; |
662921cd JPM |
404 | case LINK_SYNCH_BEGIN_EVT: |
405 | l->state = LINK_SYNCHING; | |
406 | break; | |
662921cd JPM |
407 | case LINK_FAILOVER_BEGIN_EVT: |
408 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 409 | default: |
662921cd | 410 | goto illegal_evt; |
6ab30f9c JPM |
411 | } |
412 | break; | |
662921cd | 413 | case LINK_SYNCHING: |
6ab30f9c | 414 | switch (evt) { |
662921cd JPM |
415 | case LINK_PEER_RESET_EVT: |
416 | l->state = LINK_PEER_RESET; | |
417 | rc |= TIPC_LINK_DOWN_EVT; | |
418 | break; | |
419 | case LINK_FAILURE_EVT: | |
420 | l->state = LINK_RESETTING; | |
421 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 422 | break; |
662921cd JPM |
423 | case LINK_RESET_EVT: |
424 | l->state = LINK_RESET; | |
6ab30f9c | 425 | break; |
662921cd JPM |
426 | case LINK_ESTABLISH_EVT: |
427 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 428 | break; |
662921cd JPM |
429 | case LINK_SYNCH_END_EVT: |
430 | l->state = LINK_ESTABLISHED; | |
431 | break; | |
432 | case LINK_FAILOVER_BEGIN_EVT: | |
433 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 434 | default: |
662921cd | 435 | goto illegal_evt; |
6ab30f9c JPM |
436 | } |
437 | break; | |
438 | default: | |
662921cd | 439 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 440 | } |
662921cd JPM |
441 | return rc; |
442 | illegal_evt: | |
443 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
444 | evt, l->state, l->name); | |
6ab30f9c JPM |
445 | return rc; |
446 | } | |
447 | ||
333ef69e JPM |
448 | /* link_profile_stats - update statistical profiling of traffic |
449 | */ | |
450 | static void link_profile_stats(struct tipc_link *l) | |
451 | { | |
452 | struct sk_buff *skb; | |
453 | struct tipc_msg *msg; | |
454 | int length; | |
455 | ||
456 | /* Update counters used in statistical profiling of send traffic */ | |
457 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
458 | l->stats.queue_sz_counts++; | |
459 | ||
460 | skb = skb_peek(&l->transmq); | |
461 | if (!skb) | |
462 | return; | |
463 | msg = buf_msg(skb); | |
464 | length = msg_size(msg); | |
465 | ||
466 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
467 | if (msg_type(msg) != FIRST_FRAGMENT) | |
468 | return; | |
469 | length = msg_size(msg_get_wrapped(msg)); | |
470 | } | |
471 | l->stats.msg_lengths_total += length; | |
472 | l->stats.msg_length_counts++; | |
473 | if (length <= 64) | |
474 | l->stats.msg_length_profile[0]++; | |
475 | else if (length <= 256) | |
476 | l->stats.msg_length_profile[1]++; | |
477 | else if (length <= 1024) | |
478 | l->stats.msg_length_profile[2]++; | |
479 | else if (length <= 4096) | |
480 | l->stats.msg_length_profile[3]++; | |
481 | else if (length <= 16384) | |
482 | l->stats.msg_length_profile[4]++; | |
483 | else if (length <= 32768) | |
484 | l->stats.msg_length_profile[5]++; | |
485 | else | |
486 | l->stats.msg_length_profile[6]++; | |
487 | } | |
488 | ||
489 | /* tipc_link_timeout - perform periodic task as instructed from node timeout | |
490 | */ | |
491 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
492 | { | |
493 | int rc = 0; | |
5045f7b9 JPM |
494 | int mtyp = STATE_MSG; |
495 | bool xmit = false; | |
496 | bool prb = false; | |
333ef69e JPM |
497 | |
498 | link_profile_stats(l); | |
5045f7b9 | 499 | |
662921cd JPM |
500 | switch (l->state) { |
501 | case LINK_ESTABLISHED: | |
502 | case LINK_SYNCHING: | |
5045f7b9 JPM |
503 | if (!l->silent_intv_cnt) { |
504 | if (tipc_bclink_acks_missing(l->owner)) | |
505 | xmit = true; | |
506 | } else if (l->silent_intv_cnt <= l->abort_limit) { | |
507 | xmit = true; | |
508 | prb = true; | |
509 | } else { | |
662921cd | 510 | rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
5045f7b9 JPM |
511 | } |
512 | l->silent_intv_cnt++; | |
662921cd JPM |
513 | break; |
514 | case LINK_RESET: | |
5045f7b9 JPM |
515 | xmit = true; |
516 | mtyp = RESET_MSG; | |
662921cd JPM |
517 | break; |
518 | case LINK_ESTABLISHING: | |
5045f7b9 JPM |
519 | xmit = true; |
520 | mtyp = ACTIVATE_MSG; | |
662921cd | 521 | break; |
662921cd | 522 | case LINK_PEER_RESET: |
598411d7 | 523 | case LINK_RESETTING: |
662921cd JPM |
524 | case LINK_FAILINGOVER: |
525 | break; | |
526 | default: | |
527 | break; | |
5045f7b9 | 528 | } |
662921cd | 529 | |
5045f7b9 JPM |
530 | if (xmit) |
531 | tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq); | |
532 | ||
333ef69e JPM |
533 | return rc; |
534 | } | |
535 | ||
b97bf3fd | 536 | /** |
3127a020 | 537 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 538 | * @link: congested link |
3127a020 | 539 | * @list: message that was attempted sent |
50100a5e | 540 | * Create pseudo msg to send back to user when congestion abates |
22d85c79 | 541 | * Does not consume buffer list |
b97bf3fd | 542 | */ |
3127a020 | 543 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 544 | { |
3127a020 JPM |
545 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
546 | int imp = msg_importance(msg); | |
547 | u32 oport = msg_origport(msg); | |
548 | u32 addr = link_own_addr(link); | |
549 | struct sk_buff *skb; | |
550 | ||
551 | /* This really cannot happen... */ | |
552 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
553 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
22d85c79 | 554 | return -ENOBUFS; |
3127a020 JPM |
555 | } |
556 | /* Non-blocking sender: */ | |
557 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
558 | return -ELINKCONG; | |
559 | ||
560 | /* Create and schedule wakeup pseudo message */ | |
561 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
562 | addr, addr, oport, 0, 0); | |
563 | if (!skb) | |
22d85c79 | 564 | return -ENOBUFS; |
3127a020 JPM |
565 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); |
566 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
567 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 568 | link->stats.link_congs++; |
3127a020 | 569 | return -ELINKCONG; |
b97bf3fd PL |
570 | } |
571 | ||
50100a5e JPM |
572 | /** |
573 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
574 | * @link: congested link | |
575 | * Move a number of waiting users, as permitted by available space in | |
576 | * the send queue, from link wait queue to node wait queue for wakeup | |
577 | */ | |
1f66d161 | 578 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 579 | { |
1f66d161 JPM |
580 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
581 | int imp, lim; | |
58d78b32 | 582 | struct sk_buff *skb, *tmp; |
50100a5e | 583 | |
1f66d161 JPM |
584 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
585 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
586 | lim = l->window + l->backlog[imp].limit; | |
587 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
588 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 589 | break; |
1f66d161 | 590 | skb_unlink(skb, &l->wakeupq); |
d39bbd44 | 591 | skb_queue_tail(l->inputq, skb); |
b97bf3fd | 592 | } |
b97bf3fd PL |
593 | } |
594 | ||
b97bf3fd | 595 | /** |
4323add6 | 596 | * tipc_link_reset_fragments - purge link's inbound message fragments queue |
b97bf3fd PL |
597 | * @l_ptr: pointer to link |
598 | */ | |
a18c4bc3 | 599 | void tipc_link_reset_fragments(struct tipc_link *l_ptr) |
b97bf3fd | 600 | { |
37e22164 JPM |
601 | kfree_skb(l_ptr->reasm_buf); |
602 | l_ptr->reasm_buf = NULL; | |
b97bf3fd PL |
603 | } |
604 | ||
7d967b67 | 605 | void tipc_link_purge_backlog(struct tipc_link *l) |
1f66d161 JPM |
606 | { |
607 | __skb_queue_purge(&l->backlogq); | |
608 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
609 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
610 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
611 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
612 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
613 | } | |
614 | ||
c4307285 | 615 | /** |
581465fa | 616 | * tipc_link_purge_queues - purge all pkt queues associated with link |
b97bf3fd PL |
617 | * @l_ptr: pointer to link |
618 | */ | |
581465fa | 619 | void tipc_link_purge_queues(struct tipc_link *l_ptr) |
b97bf3fd | 620 | { |
05dcc5aa JPM |
621 | __skb_queue_purge(&l_ptr->deferdq); |
622 | __skb_queue_purge(&l_ptr->transmq); | |
1f66d161 | 623 | tipc_link_purge_backlog(l_ptr); |
4323add6 | 624 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
625 | } |
626 | ||
6e498158 | 627 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 628 | { |
a686e685 | 629 | /* Link is down, accept any session */ |
6e498158 | 630 | l->peer_session = WILDCARD_SESSION; |
b97bf3fd | 631 | |
6e498158 JPM |
632 | /* If peer is up, it only accepts an incremented session number */ |
633 | msg_set_session(l->pmsg, msg_session(l->pmsg) + 1); | |
b97bf3fd | 634 | |
6e498158 JPM |
635 | /* Prepare for renewed mtu size negotiation */ |
636 | l->mtu = l->advertised_mtu; | |
b97bf3fd | 637 | |
23d8335d | 638 | /* Clean up all queues: */ |
6e498158 JPM |
639 | __skb_queue_purge(&l->transmq); |
640 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 641 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
6e498158 JPM |
642 | |
643 | tipc_link_purge_backlog(l); | |
644 | kfree_skb(l->reasm_buf); | |
645 | kfree_skb(l->failover_reasm_skb); | |
646 | l->reasm_buf = NULL; | |
647 | l->failover_reasm_skb = NULL; | |
648 | l->rcv_unacked = 0; | |
649 | l->snd_nxt = 1; | |
650 | l->rcv_nxt = 1; | |
c1ab3f1d | 651 | l->acked = 0; |
6e498158 JPM |
652 | l->silent_intv_cnt = 0; |
653 | l->stats.recv_info = 0; | |
654 | l->stale_count = 0; | |
655 | link_reset_statistics(l); | |
b97bf3fd PL |
656 | } |
657 | ||
4f1688b2 | 658 | /** |
9fbfb8b1 | 659 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 660 | * @link: link to use |
a6ca1094 YX |
661 | * @list: chain of buffers containing message |
662 | * | |
22d85c79 | 663 | * Consumes the buffer chain, except when returning an error code, |
3127a020 JPM |
664 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
665 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
4f1688b2 | 666 | */ |
7f9f95d9 YX |
667 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
668 | struct sk_buff_head *list) | |
4f1688b2 | 669 | { |
a6ca1094 | 670 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
05dcc5aa | 671 | unsigned int maxwin = link->window; |
f21e897e | 672 | unsigned int i, imp = msg_importance(msg); |
ed193ece | 673 | uint mtu = link->mtu; |
a97b9d3f JPM |
674 | u16 ack = mod(link->rcv_nxt - 1); |
675 | u16 seqno = link->snd_nxt; | |
e4bf4f76 | 676 | u16 bc_last_in = link->owner->bclink.last_in; |
440d8963 | 677 | struct tipc_media_addr *addr = link->media_addr; |
05dcc5aa JPM |
678 | struct sk_buff_head *transmq = &link->transmq; |
679 | struct sk_buff_head *backlogq = &link->backlogq; | |
dd3f9e70 | 680 | struct sk_buff *skb, *bskb; |
4f1688b2 | 681 | |
f21e897e JPM |
682 | /* Match msg importance against this and all higher backlog limits: */ |
683 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
684 | if (unlikely(link->backlog[i].len >= link->backlog[i].limit)) | |
685 | return link_schedule_user(link, list); | |
686 | } | |
22d85c79 | 687 | if (unlikely(msg_size(msg) > mtu)) |
4f1688b2 | 688 | return -EMSGSIZE; |
22d85c79 | 689 | |
05dcc5aa | 690 | /* Prepare each packet for sending, and add to relevant queue: */ |
dd3f9e70 JPM |
691 | while (skb_queue_len(list)) { |
692 | skb = skb_peek(list); | |
58dc55f2 | 693 | msg = buf_msg(skb); |
05dcc5aa JPM |
694 | msg_set_seqno(msg, seqno); |
695 | msg_set_ack(msg, ack); | |
4f1688b2 JPM |
696 | msg_set_bcast_ack(msg, bc_last_in); |
697 | ||
05dcc5aa | 698 | if (likely(skb_queue_len(transmq) < maxwin)) { |
dd3f9e70 | 699 | __skb_dequeue(list); |
05dcc5aa JPM |
700 | __skb_queue_tail(transmq, skb); |
701 | tipc_bearer_send(net, link->bearer_id, skb, addr); | |
702 | link->rcv_unacked = 0; | |
703 | seqno++; | |
704 | continue; | |
705 | } | |
dd3f9e70 JPM |
706 | if (tipc_msg_bundle(skb_peek_tail(backlogq), msg, mtu)) { |
707 | kfree_skb(__skb_dequeue(list)); | |
4f1688b2 | 708 | link->stats.sent_bundled++; |
4f1688b2 | 709 | continue; |
05dcc5aa | 710 | } |
dd3f9e70 JPM |
711 | if (tipc_msg_make_bundle(&bskb, msg, mtu, link->addr)) { |
712 | kfree_skb(__skb_dequeue(list)); | |
713 | __skb_queue_tail(backlogq, bskb); | |
714 | link->backlog[msg_importance(buf_msg(bskb))].len++; | |
4f1688b2 JPM |
715 | link->stats.sent_bundled++; |
716 | link->stats.sent_bundles++; | |
dd3f9e70 | 717 | continue; |
4f1688b2 | 718 | } |
dd3f9e70 JPM |
719 | link->backlog[imp].len += skb_queue_len(list); |
720 | skb_queue_splice_tail_init(list, backlogq); | |
4f1688b2 | 721 | } |
a97b9d3f | 722 | link->snd_nxt = seqno; |
4f1688b2 JPM |
723 | return 0; |
724 | } | |
725 | ||
af9b028e JPM |
726 | /** |
727 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
728 | * @link: link to use | |
729 | * @list: chain of buffers containing message | |
730 | * @xmitq: returned list of packets to be sent by caller | |
731 | * | |
732 | * Consumes the buffer chain, except when returning -ELINKCONG, | |
733 | * since the caller then may want to make more send attempts. | |
734 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
735 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
736 | */ | |
737 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
738 | struct sk_buff_head *xmitq) | |
739 | { | |
740 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
741 | unsigned int maxwin = l->window; | |
742 | unsigned int i, imp = msg_importance(hdr); | |
743 | unsigned int mtu = l->mtu; | |
744 | u16 ack = l->rcv_nxt - 1; | |
745 | u16 seqno = l->snd_nxt; | |
746 | u16 bc_last_in = l->owner->bclink.last_in; | |
747 | struct sk_buff_head *transmq = &l->transmq; | |
748 | struct sk_buff_head *backlogq = &l->backlogq; | |
749 | struct sk_buff *skb, *_skb, *bskb; | |
750 | ||
751 | /* Match msg importance against this and all higher backlog limits: */ | |
752 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
753 | if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) | |
754 | return link_schedule_user(l, list); | |
755 | } | |
756 | if (unlikely(msg_size(hdr) > mtu)) | |
757 | return -EMSGSIZE; | |
758 | ||
759 | /* Prepare each packet for sending, and add to relevant queue: */ | |
760 | while (skb_queue_len(list)) { | |
761 | skb = skb_peek(list); | |
762 | hdr = buf_msg(skb); | |
763 | msg_set_seqno(hdr, seqno); | |
764 | msg_set_ack(hdr, ack); | |
765 | msg_set_bcast_ack(hdr, bc_last_in); | |
766 | ||
767 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
768 | _skb = skb_clone(skb, GFP_ATOMIC); | |
769 | if (!_skb) | |
770 | return -ENOBUFS; | |
771 | __skb_dequeue(list); | |
772 | __skb_queue_tail(transmq, skb); | |
773 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 774 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e JPM |
775 | l->rcv_unacked = 0; |
776 | seqno++; | |
777 | continue; | |
778 | } | |
779 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
780 | kfree_skb(__skb_dequeue(list)); | |
781 | l->stats.sent_bundled++; | |
782 | continue; | |
783 | } | |
784 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
785 | kfree_skb(__skb_dequeue(list)); | |
786 | __skb_queue_tail(backlogq, bskb); | |
787 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
788 | l->stats.sent_bundled++; | |
789 | l->stats.sent_bundles++; | |
790 | continue; | |
791 | } | |
792 | l->backlog[imp].len += skb_queue_len(list); | |
793 | skb_queue_splice_tail_init(list, backlogq); | |
794 | } | |
795 | l->snd_nxt = seqno; | |
796 | return 0; | |
797 | } | |
798 | ||
c64f7a6a | 799 | /* |
247f0f3c | 800 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
801 | * Receive the sequence number where we should start receiving and |
802 | * acking broadcast packets from a newly added peer node, and open | |
803 | * up for reception of such packets. | |
804 | * | |
805 | * Called with node locked | |
806 | */ | |
247f0f3c | 807 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
808 | { |
809 | struct tipc_msg *msg = buf_msg(buf); | |
810 | ||
811 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
812 | n->bclink.recv_permitted = true; | |
813 | kfree_skb(buf); | |
814 | } | |
815 | ||
c4307285 | 816 | /* |
47b4c9a8 YX |
817 | * tipc_link_push_packets - push unsent packets to bearer |
818 | * | |
819 | * Push out the unsent messages of a link where congestion | |
820 | * has abated. Node is locked. | |
821 | * | |
822 | * Called with node locked | |
b97bf3fd | 823 | */ |
05dcc5aa | 824 | void tipc_link_push_packets(struct tipc_link *link) |
b97bf3fd | 825 | { |
05dcc5aa | 826 | struct sk_buff *skb; |
47b4c9a8 | 827 | struct tipc_msg *msg; |
dd3f9e70 | 828 | u16 seqno = link->snd_nxt; |
a97b9d3f | 829 | u16 ack = mod(link->rcv_nxt - 1); |
b97bf3fd | 830 | |
05dcc5aa JPM |
831 | while (skb_queue_len(&link->transmq) < link->window) { |
832 | skb = __skb_dequeue(&link->backlogq); | |
833 | if (!skb) | |
47b4c9a8 | 834 | break; |
c1ab3f1d | 835 | TIPC_SKB_CB(skb)->ackers = link->ackers; |
05dcc5aa | 836 | msg = buf_msg(skb); |
1f66d161 | 837 | link->backlog[msg_importance(msg)].len--; |
05dcc5aa | 838 | msg_set_ack(msg, ack); |
dd3f9e70 JPM |
839 | msg_set_seqno(msg, seqno); |
840 | seqno = mod(seqno + 1); | |
05dcc5aa JPM |
841 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); |
842 | link->rcv_unacked = 0; | |
843 | __skb_queue_tail(&link->transmq, skb); | |
844 | tipc_bearer_send(link->owner->net, link->bearer_id, | |
440d8963 | 845 | skb, link->media_addr); |
b97bf3fd | 846 | } |
dd3f9e70 | 847 | link->snd_nxt = seqno; |
b97bf3fd PL |
848 | } |
849 | ||
d999297c JPM |
850 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
851 | { | |
852 | struct sk_buff *skb, *_skb; | |
853 | struct tipc_msg *hdr; | |
854 | u16 seqno = l->snd_nxt; | |
855 | u16 ack = l->rcv_nxt - 1; | |
856 | ||
857 | while (skb_queue_len(&l->transmq) < l->window) { | |
858 | skb = skb_peek(&l->backlogq); | |
859 | if (!skb) | |
860 | break; | |
861 | _skb = skb_clone(skb, GFP_ATOMIC); | |
862 | if (!_skb) | |
863 | break; | |
864 | __skb_dequeue(&l->backlogq); | |
865 | hdr = buf_msg(skb); | |
866 | l->backlog[msg_importance(hdr)].len--; | |
867 | __skb_queue_tail(&l->transmq, skb); | |
868 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 869 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c JPM |
870 | msg_set_ack(hdr, ack); |
871 | msg_set_seqno(hdr, seqno); | |
872 | msg_set_bcast_ack(hdr, l->owner->bclink.last_in); | |
873 | l->rcv_unacked = 0; | |
874 | seqno++; | |
875 | } | |
876 | l->snd_nxt = seqno; | |
877 | } | |
878 | ||
a18c4bc3 | 879 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 880 | struct sk_buff *buf) |
d356eeba AS |
881 | { |
882 | struct tipc_msg *msg = buf_msg(buf); | |
1da46568 | 883 | struct net *net = l_ptr->owner->net; |
d356eeba | 884 | |
2cf8aa19 | 885 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
886 | |
887 | if (l_ptr->addr) { | |
d356eeba | 888 | /* Handle failure on standard link */ |
1a20cc25 JPM |
889 | link_print(l_ptr, "Resetting link "); |
890 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
891 | msg_user(msg), msg_type(msg), msg_size(msg), | |
892 | msg_errcode(msg)); | |
893 | pr_info("sqno %u, prev: %x, src: %x\n", | |
894 | msg_seqno(msg), msg_prevnode(msg), msg_orignode(msg)); | |
d356eeba | 895 | } else { |
d356eeba | 896 | /* Handle failure on broadcast link */ |
6c00055a | 897 | struct tipc_node *n_ptr; |
d356eeba AS |
898 | char addr_string[16]; |
899 | ||
2cf8aa19 EH |
900 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
901 | pr_cont("Outstanding acks: %lu\n", | |
902 | (unsigned long) TIPC_SKB_CB(buf)->handle); | |
617dbeaa | 903 | |
1da46568 | 904 | n_ptr = tipc_bclink_retransmit_to(net); |
d356eeba | 905 | |
c68ca7b7 | 906 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 907 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
908 | pr_info("Reception permitted: %d, Acked: %u\n", |
909 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
910 | n_ptr->bclink.acked); |
911 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
912 | n_ptr->bclink.last_in, | |
913 | n_ptr->bclink.oos_state, | |
914 | n_ptr->bclink.last_sent); | |
d356eeba | 915 | |
b952b2be | 916 | n_ptr->action_flags |= TIPC_BCAST_RESET; |
d356eeba AS |
917 | l_ptr->stale_count = 0; |
918 | } | |
919 | } | |
920 | ||
58dc55f2 | 921 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 922 | u32 retransmits) |
b97bf3fd PL |
923 | { |
924 | struct tipc_msg *msg; | |
925 | ||
58dc55f2 | 926 | if (!skb) |
d356eeba AS |
927 | return; |
928 | ||
58dc55f2 | 929 | msg = buf_msg(skb); |
c4307285 | 930 | |
512137ee | 931 | /* Detect repeated retransmit failures */ |
a97b9d3f | 932 | if (l_ptr->last_retransm == msg_seqno(msg)) { |
512137ee | 933 | if (++l_ptr->stale_count > 100) { |
58dc55f2 | 934 | link_retransmit_failure(l_ptr, skb); |
512137ee | 935 | return; |
d356eeba AS |
936 | } |
937 | } else { | |
a97b9d3f | 938 | l_ptr->last_retransm = msg_seqno(msg); |
512137ee | 939 | l_ptr->stale_count = 1; |
b97bf3fd | 940 | } |
d356eeba | 941 | |
05dcc5aa JPM |
942 | skb_queue_walk_from(&l_ptr->transmq, skb) { |
943 | if (!retransmits) | |
58dc55f2 YX |
944 | break; |
945 | msg = buf_msg(skb); | |
a97b9d3f | 946 | msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1)); |
c4307285 | 947 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 | 948 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
440d8963 | 949 | l_ptr->media_addr); |
3c294cb3 YX |
950 | retransmits--; |
951 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 952 | } |
b97bf3fd PL |
953 | } |
954 | ||
c1ab3f1d JPM |
955 | int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to, |
956 | struct sk_buff_head *xmitq) | |
d999297c JPM |
957 | { |
958 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
959 | struct tipc_msg *hdr; | |
c1ab3f1d JPM |
960 | u16 ack = l->rcv_nxt - 1; |
961 | u16 bc_ack = l->owner->bclink.last_in; | |
d999297c JPM |
962 | |
963 | if (!skb) | |
964 | return 0; | |
965 | ||
966 | /* Detect repeated retransmit failures on same packet */ | |
967 | if (likely(l->last_retransm != buf_seqno(skb))) { | |
968 | l->last_retransm = buf_seqno(skb); | |
969 | l->stale_count = 1; | |
970 | } else if (++l->stale_count > 100) { | |
971 | link_retransmit_failure(l, skb); | |
662921cd | 972 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c | 973 | } |
c1ab3f1d JPM |
974 | |
975 | /* Move forward to where retransmission should start */ | |
d999297c | 976 | skb_queue_walk(&l->transmq, skb) { |
c1ab3f1d JPM |
977 | if (!less(buf_seqno(skb), from)) |
978 | break; | |
979 | } | |
980 | ||
981 | skb_queue_walk_from(&l->transmq, skb) { | |
982 | if (more(buf_seqno(skb), to)) | |
983 | break; | |
d999297c JPM |
984 | hdr = buf_msg(skb); |
985 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); | |
986 | if (!_skb) | |
987 | return 0; | |
988 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
989 | msg_set_ack(hdr, ack); |
990 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
991 | _skb->priority = TC_PRIO_CONTROL; |
992 | __skb_queue_tail(xmitq, _skb); | |
d999297c JPM |
993 | l->stats.retransmitted++; |
994 | } | |
995 | return 0; | |
996 | } | |
997 | ||
c637c103 | 998 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 999 | * |
c637c103 | 1000 | * Consumes buffer if message is of right type |
7ae934be EH |
1001 | * Node lock must be held |
1002 | */ | |
9073fb8b JPM |
1003 | static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb, |
1004 | struct sk_buff_head *inputq) | |
7ae934be | 1005 | { |
c637c103 | 1006 | struct tipc_node *node = link->owner; |
7ae934be | 1007 | |
9073fb8b | 1008 | switch (msg_user(buf_msg(skb))) { |
c637c103 JPM |
1009 | case TIPC_LOW_IMPORTANCE: |
1010 | case TIPC_MEDIUM_IMPORTANCE: | |
1011 | case TIPC_HIGH_IMPORTANCE: | |
1012 | case TIPC_CRITICAL_IMPORTANCE: | |
1013 | case CONN_MANAGER: | |
9945e804 | 1014 | skb_queue_tail(inputq, skb); |
c637c103 | 1015 | return true; |
7ae934be | 1016 | case NAME_DISTRIBUTOR: |
c637c103 | 1017 | node->bclink.recv_permitted = true; |
d39bbd44 | 1018 | skb_queue_tail(link->namedq, skb); |
c637c103 JPM |
1019 | return true; |
1020 | case MSG_BUNDLER: | |
dff29b1a | 1021 | case TUNNEL_PROTOCOL: |
c637c103 | 1022 | case MSG_FRAGMENTER: |
7ae934be | 1023 | case BCAST_PROTOCOL: |
c637c103 | 1024 | return false; |
7ae934be | 1025 | default: |
c637c103 JPM |
1026 | pr_warn("Dropping received illegal msg type\n"); |
1027 | kfree_skb(skb); | |
1028 | return false; | |
1029 | }; | |
7ae934be | 1030 | } |
c637c103 JPM |
1031 | |
1032 | /* tipc_link_input - process packet that has passed link protocol check | |
1033 | * | |
1034 | * Consumes buffer | |
7ae934be | 1035 | */ |
9073fb8b JPM |
1036 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
1037 | struct sk_buff_head *inputq) | |
7ae934be | 1038 | { |
6e498158 JPM |
1039 | struct tipc_node *node = l->owner; |
1040 | struct tipc_msg *hdr = buf_msg(skb); | |
1041 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 1042 | struct sk_buff *iskb; |
9945e804 | 1043 | struct sk_buff_head tmpq; |
6e498158 | 1044 | int usr = msg_user(hdr); |
6144a996 | 1045 | int rc = 0; |
6e498158 JPM |
1046 | int pos = 0; |
1047 | int ipos = 0; | |
c637c103 | 1048 | |
6e498158 JPM |
1049 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
1050 | if (msg_type(hdr) == SYNCH_MSG) { | |
1051 | __skb_queue_purge(&l->deferdq); | |
1052 | goto drop; | |
8b4ed863 | 1053 | } |
6e498158 JPM |
1054 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
1055 | return rc; | |
1056 | kfree_skb(skb); | |
1057 | skb = iskb; | |
1058 | hdr = buf_msg(skb); | |
1059 | if (less(msg_seqno(hdr), l->drop_point)) | |
1060 | goto drop; | |
9073fb8b | 1061 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
1062 | return rc; |
1063 | usr = msg_user(hdr); | |
1064 | reasm_skb = &l->failover_reasm_skb; | |
1065 | } | |
c637c103 | 1066 | |
6e498158 | 1067 | if (usr == MSG_BUNDLER) { |
9945e804 | 1068 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1069 | l->stats.recv_bundles++; |
1070 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1071 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1072 | tipc_data_input(l, iskb, &tmpq); |
1073 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1074 | return 0; |
6e498158 JPM |
1075 | } else if (usr == MSG_FRAGMENTER) { |
1076 | l->stats.recv_fragments++; | |
1077 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1078 | l->stats.recv_fragmented++; | |
9073fb8b | 1079 | tipc_data_input(l, skb, inputq); |
6e498158 | 1080 | } else if (!*reasm_skb) { |
662921cd | 1081 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1082 | } |
662921cd | 1083 | return 0; |
6e498158 | 1084 | } else if (usr == BCAST_PROTOCOL) { |
c637c103 | 1085 | tipc_link_sync_rcv(node, skb); |
662921cd | 1086 | return 0; |
6e498158 JPM |
1087 | } |
1088 | drop: | |
1089 | kfree_skb(skb); | |
662921cd | 1090 | return 0; |
7ae934be EH |
1091 | } |
1092 | ||
d999297c JPM |
1093 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1094 | { | |
1095 | bool released = false; | |
1096 | struct sk_buff *skb, *tmp; | |
1097 | ||
1098 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1099 | if (more(buf_seqno(skb), acked)) | |
1100 | break; | |
1101 | __skb_unlink(skb, &l->transmq); | |
1102 | kfree_skb(skb); | |
1103 | released = true; | |
1104 | } | |
1105 | return released; | |
1106 | } | |
1107 | ||
f9aa358a JPM |
1108 | /* tipc_link_build_ack_msg: prepare link acknowledge message for transmission |
1109 | */ | |
1110 | void tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1111 | { | |
1112 | l->rcv_unacked = 0; | |
1113 | l->stats.sent_acks++; | |
1114 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
1115 | } | |
1116 | ||
282b3a05 JPM |
1117 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1118 | */ | |
1119 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1120 | { | |
1121 | int mtyp = RESET_MSG; | |
1122 | ||
1123 | if (l->state == LINK_ESTABLISHING) | |
1124 | mtyp = ACTIVATE_MSG; | |
1125 | ||
1126 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq); | |
1127 | } | |
1128 | ||
f9aa358a JPM |
1129 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
1130 | */ | |
1131 | static void tipc_link_build_nack_msg(struct tipc_link *l, | |
1132 | struct sk_buff_head *xmitq) | |
1133 | { | |
1134 | u32 def_cnt = ++l->stats.deferred_recv; | |
1135 | ||
1136 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) | |
1137 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
1138 | } | |
1139 | ||
d999297c | 1140 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1141 | * @l: the link that should handle the message |
d999297c JPM |
1142 | * @skb: TIPC packet |
1143 | * @xmitq: queue to place packets to be sent after this call | |
1144 | */ | |
1145 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1146 | struct sk_buff_head *xmitq) | |
1147 | { | |
f9aa358a | 1148 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1149 | struct tipc_msg *hdr; |
81204c49 | 1150 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1151 | int rc = 0; |
1152 | ||
f9aa358a | 1153 | do { |
d999297c | 1154 | hdr = buf_msg(skb); |
f9aa358a JPM |
1155 | seqno = msg_seqno(hdr); |
1156 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1157 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1158 | |
1159 | /* Verify and update link state */ | |
f9aa358a JPM |
1160 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1161 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1162 | |
662921cd | 1163 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1164 | if (l->state == LINK_ESTABLISHING) |
1165 | rc = TIPC_LINK_UP_EVT; | |
1166 | goto drop; | |
d999297c JPM |
1167 | } |
1168 | ||
f9aa358a | 1169 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1170 | l->silent_intv_cnt = 0; |
1171 | ||
81204c49 JPM |
1172 | /* Drop if outside receive window */ |
1173 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1174 | l->stats.duplicates++; | |
1175 | goto drop; | |
1176 | } | |
1177 | ||
d999297c JPM |
1178 | /* Forward queues and wake up waiting users */ |
1179 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1180 | tipc_link_advance_backlog(l, xmitq); | |
1181 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1182 | link_prepare_wakeup(l); | |
1183 | } | |
1184 | ||
81204c49 JPM |
1185 | /* Defer delivery if sequence gap */ |
1186 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1187 | __tipc_skb_queue_sorted(defq, seqno, skb); |
f9aa358a JPM |
1188 | tipc_link_build_nack_msg(l, xmitq); |
1189 | break; | |
d999297c JPM |
1190 | } |
1191 | ||
81204c49 | 1192 | /* Deliver packet */ |
d999297c JPM |
1193 | l->rcv_nxt++; |
1194 | l->stats.recv_info++; | |
f9aa358a | 1195 | if (!tipc_data_input(l, skb, l->inputq)) |
9945e804 | 1196 | rc = tipc_link_input(l, skb, l->inputq); |
81204c49 | 1197 | if (unlikely(rc)) |
f9aa358a | 1198 | break; |
f9aa358a JPM |
1199 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
1200 | tipc_link_build_ack_msg(l, xmitq); | |
1201 | ||
1202 | } while ((skb = __skb_dequeue(defq))); | |
1203 | ||
1204 | return rc; | |
1205 | drop: | |
1206 | kfree_skb(skb); | |
d999297c JPM |
1207 | return rc; |
1208 | } | |
1209 | ||
2c53040f | 1210 | /** |
8809b255 AS |
1211 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1212 | * | |
1213 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1214 | */ |
bc6fecd4 | 1215 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1216 | { |
bc6fecd4 | 1217 | struct sk_buff *skb1; |
e4bf4f76 | 1218 | u16 seq_no = buf_seqno(skb); |
b97bf3fd PL |
1219 | |
1220 | /* Empty queue ? */ | |
bc6fecd4 YX |
1221 | if (skb_queue_empty(list)) { |
1222 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1223 | return 1; |
1224 | } | |
1225 | ||
1226 | /* Last ? */ | |
bc6fecd4 YX |
1227 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1228 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1229 | return 1; |
1230 | } | |
1231 | ||
8809b255 | 1232 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 | 1233 | skb_queue_walk(list, skb1) { |
e4bf4f76 | 1234 | u16 curr_seqno = buf_seqno(skb1); |
b97bf3fd | 1235 | |
8809b255 | 1236 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1237 | kfree_skb(skb); |
8809b255 | 1238 | return 0; |
b97bf3fd | 1239 | } |
8809b255 AS |
1240 | |
1241 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1242 | break; |
8809b255 | 1243 | } |
b97bf3fd | 1244 | |
bc6fecd4 | 1245 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1246 | return 1; |
b97bf3fd PL |
1247 | } |
1248 | ||
b97bf3fd PL |
1249 | /* |
1250 | * Send protocol message to the other endpoint. | |
1251 | */ | |
426cc2b8 | 1252 | void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg, |
ed193ece | 1253 | u32 gap, u32 tolerance, u32 priority) |
b97bf3fd | 1254 | { |
426cc2b8 JPM |
1255 | struct sk_buff *skb = NULL; |
1256 | struct sk_buff_head xmitq; | |
b97bf3fd | 1257 | |
426cc2b8 JPM |
1258 | __skb_queue_head_init(&xmitq); |
1259 | tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap, | |
1260 | tolerance, priority, &xmitq); | |
1261 | skb = __skb_dequeue(&xmitq); | |
1262 | if (!skb) | |
b97bf3fd | 1263 | return; |
440d8963 | 1264 | tipc_bearer_send(l->owner->net, l->bearer_id, skb, l->media_addr); |
426cc2b8 JPM |
1265 | l->rcv_unacked = 0; |
1266 | kfree_skb(skb); | |
b97bf3fd PL |
1267 | } |
1268 | ||
426cc2b8 JPM |
1269 | /* tipc_link_build_proto_msg: prepare link protocol message for transmission |
1270 | */ | |
1271 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, | |
1272 | u16 rcvgap, int tolerance, int priority, | |
1273 | struct sk_buff_head *xmitq) | |
1274 | { | |
1275 | struct sk_buff *skb = NULL; | |
1276 | struct tipc_msg *hdr = l->pmsg; | |
1277 | u16 snd_nxt = l->snd_nxt; | |
1278 | u16 rcv_nxt = l->rcv_nxt; | |
1279 | u16 rcv_last = rcv_nxt - 1; | |
1280 | int node_up = l->owner->bclink.recv_permitted; | |
1281 | ||
1282 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1283 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1284 | return; |
1285 | ||
426cc2b8 JPM |
1286 | msg_set_type(hdr, mtyp); |
1287 | msg_set_net_plane(hdr, l->net_plane); | |
1288 | msg_set_bcast_ack(hdr, l->owner->bclink.last_in); | |
1289 | msg_set_last_bcast(hdr, tipc_bclink_get_last_sent(l->owner->net)); | |
1290 | msg_set_link_tolerance(hdr, tolerance); | |
1291 | msg_set_linkprio(hdr, priority); | |
1292 | msg_set_redundant_link(hdr, node_up); | |
1293 | msg_set_seq_gap(hdr, 0); | |
1294 | ||
1295 | /* Compatibility: created msg must not be in sequence with pkt flow */ | |
1296 | msg_set_seqno(hdr, snd_nxt + U16_MAX / 2); | |
1297 | ||
1298 | if (mtyp == STATE_MSG) { | |
1299 | if (!tipc_link_is_up(l)) | |
1300 | return; | |
1301 | msg_set_next_sent(hdr, snd_nxt); | |
1302 | ||
1303 | /* Override rcvgap if there are packets in deferred queue */ | |
1304 | if (!skb_queue_empty(&l->deferdq)) | |
1305 | rcvgap = buf_seqno(skb_peek(&l->deferdq)) - rcv_nxt; | |
1306 | if (rcvgap) { | |
1307 | msg_set_seq_gap(hdr, rcvgap); | |
1308 | l->stats.sent_nacks++; | |
1309 | } | |
1310 | msg_set_ack(hdr, rcv_last); | |
1311 | msg_set_probe(hdr, probe); | |
1312 | if (probe) | |
1313 | l->stats.sent_probes++; | |
1314 | l->stats.sent_states++; | |
1315 | } else { | |
1316 | /* RESET_MSG or ACTIVATE_MSG */ | |
1317 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
6e498158 | 1318 | msg_set_ack(hdr, l->rcv_nxt - 1); |
426cc2b8 JPM |
1319 | msg_set_next_sent(hdr, 1); |
1320 | } | |
1321 | skb = tipc_buf_acquire(msg_size(hdr)); | |
1322 | if (!skb) | |
1323 | return; | |
1324 | skb_copy_to_linear_data(skb, hdr, msg_size(hdr)); | |
1325 | skb->priority = TC_PRIO_CONTROL; | |
6e498158 | 1326 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1327 | } |
1328 | ||
6e498158 | 1329 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1330 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1331 | */ |
6e498158 JPM |
1332 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1333 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1334 | { |
6e498158 JPM |
1335 | struct sk_buff *skb, *tnlskb; |
1336 | struct tipc_msg *hdr, tnlhdr; | |
1337 | struct sk_buff_head *queue = &l->transmq; | |
1338 | struct sk_buff_head tmpxq, tnlq; | |
1339 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1340 | |
6e498158 | 1341 | if (!tnl) |
b97bf3fd PL |
1342 | return; |
1343 | ||
6e498158 JPM |
1344 | skb_queue_head_init(&tnlq); |
1345 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1346 | |
6e498158 JPM |
1347 | /* At least one packet required for safe algorithm => add dummy */ |
1348 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1349 | BASIC_H_SIZE, 0, l->addr, link_own_addr(l), | |
1350 | 0, 0, TIPC_ERR_NO_PORT); | |
1351 | if (!skb) { | |
1352 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1353 | return; |
1354 | } | |
6e498158 JPM |
1355 | skb_queue_tail(&tnlq, skb); |
1356 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1357 | __skb_queue_purge(&tmpxq); | |
1358 | ||
1359 | /* Initialize reusable tunnel packet header */ | |
1360 | tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL, | |
1361 | mtyp, INT_H_SIZE, l->addr); | |
1362 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1363 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1364 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1365 | tnl: | |
1366 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1367 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1368 | hdr = buf_msg(skb); |
1369 | if (queue == &l->backlogq) | |
1370 | msg_set_seqno(hdr, seqno++); | |
1371 | pktlen = msg_size(hdr); | |
1372 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
1373 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE); | |
1374 | if (!tnlskb) { | |
1375 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1376 | return; |
1377 | } | |
6e498158 JPM |
1378 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1379 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1380 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1381 | } |
6e498158 JPM |
1382 | if (queue != &l->backlogq) { |
1383 | queue = &l->backlogq; | |
1384 | goto tnl; | |
f006c9c7 | 1385 | } |
1dab3d5a | 1386 | |
6e498158 | 1387 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1388 | |
6e498158 JPM |
1389 | if (mtyp == FAILOVER_MSG) { |
1390 | tnl->drop_point = l->rcv_nxt; | |
1391 | tnl->failover_reasm_skb = l->reasm_buf; | |
1392 | l->reasm_buf = NULL; | |
2da71425 | 1393 | } |
b97bf3fd PL |
1394 | } |
1395 | ||
d999297c JPM |
1396 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1397 | * Note that network plane id propagates through the network, and may | |
1398 | * change at any time. The node with lowest numerical id determines | |
1399 | * network plane | |
1400 | */ | |
1401 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1402 | struct sk_buff_head *xmitq) | |
1403 | { | |
1404 | struct tipc_msg *hdr = buf_msg(skb); | |
1405 | u16 rcvgap = 0; | |
c1ab3f1d JPM |
1406 | u16 ack = msg_ack(hdr); |
1407 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1408 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1409 | u16 peers_tol = msg_link_tolerance(hdr); | |
1410 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1411 | u16 rcv_nxt = l->rcv_nxt; |
73f646ce | 1412 | int mtyp = msg_type(hdr); |
d999297c JPM |
1413 | char *if_name; |
1414 | int rc = 0; | |
1415 | ||
662921cd | 1416 | if (tipc_link_is_blocked(l)) |
d999297c JPM |
1417 | goto exit; |
1418 | ||
1419 | if (link_own_addr(l) > msg_prevnode(hdr)) | |
1420 | l->net_plane = msg_net_plane(hdr); | |
1421 | ||
73f646ce | 1422 | switch (mtyp) { |
d999297c JPM |
1423 | case RESET_MSG: |
1424 | ||
1425 | /* Ignore duplicate RESET with old session number */ | |
1426 | if ((less_eq(msg_session(hdr), l->peer_session)) && | |
1427 | (l->peer_session != WILDCARD_SESSION)) | |
1428 | break; | |
1429 | /* fall thru' */ | |
662921cd | 1430 | |
d999297c JPM |
1431 | case ACTIVATE_MSG: |
1432 | ||
1433 | /* Complete own link name with peer's interface name */ | |
1434 | if_name = strrchr(l->name, ':') + 1; | |
1435 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1436 | break; | |
1437 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1438 | break; | |
1439 | strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME); | |
1440 | ||
1441 | /* Update own tolerance if peer indicates a non-zero value */ | |
1442 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1443 | l->tolerance = peers_tol; | |
1444 | ||
1445 | /* Update own priority if peer's priority is higher */ | |
1446 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1447 | l->priority = peers_prio; | |
1448 | ||
73f646ce JPM |
1449 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
1450 | if ((mtyp == RESET_MSG) || !link_is_up(l)) | |
1451 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); | |
1452 | ||
1453 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
1454 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) | |
1455 | rc = TIPC_LINK_UP_EVT; | |
1456 | ||
d999297c JPM |
1457 | l->peer_session = msg_session(hdr); |
1458 | l->peer_bearer_id = msg_bearer_id(hdr); | |
d999297c JPM |
1459 | if (l->mtu > msg_max_pkt(hdr)) |
1460 | l->mtu = msg_max_pkt(hdr); | |
1461 | break; | |
662921cd | 1462 | |
d999297c | 1463 | case STATE_MSG: |
662921cd | 1464 | |
d999297c JPM |
1465 | /* Update own tolerance if peer indicates a non-zero value */ |
1466 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1467 | l->tolerance = peers_tol; | |
1468 | ||
1469 | l->silent_intv_cnt = 0; | |
1470 | l->stats.recv_states++; | |
1471 | if (msg_probe(hdr)) | |
1472 | l->stats.recv_probes++; | |
73f646ce JPM |
1473 | |
1474 | if (!link_is_up(l)) { | |
1475 | if (l->state == LINK_ESTABLISHING) | |
1476 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1477 | break; |
73f646ce | 1478 | } |
d999297c | 1479 | |
662921cd | 1480 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1481 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c JPM |
1482 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
1483 | if (rcvgap || (msg_probe(hdr))) | |
1484 | tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap, | |
16040894 | 1485 | 0, 0, xmitq); |
c1ab3f1d | 1486 | tipc_link_release_pkts(l, ack); |
d999297c JPM |
1487 | |
1488 | /* If NACK, retransmit will now start at right position */ | |
c1ab3f1d JPM |
1489 | if (gap) { |
1490 | rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq); | |
d999297c JPM |
1491 | l->stats.recv_nacks++; |
1492 | } | |
662921cd | 1493 | |
d999297c JPM |
1494 | tipc_link_advance_backlog(l, xmitq); |
1495 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1496 | link_prepare_wakeup(l); | |
1497 | } | |
1498 | exit: | |
1499 | kfree_skb(skb); | |
1500 | return rc; | |
1501 | } | |
1502 | ||
e3eea1eb | 1503 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1504 | { |
ed193ece | 1505 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1506 | |
1507 | l->window = win; | |
1f66d161 JPM |
1508 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1509 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1510 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1511 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1512 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1513 | } |
1514 | ||
e099e86c | 1515 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1516 | * @net: the applicable net namespace |
e099e86c JPM |
1517 | * @name: pointer to link name string |
1518 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1519 | * |
e099e86c | 1520 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1521 | */ |
f2f9800d YX |
1522 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1523 | const char *link_name, | |
e099e86c | 1524 | unsigned int *bearer_id) |
b97bf3fd | 1525 | { |
f2f9800d | 1526 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1527 | struct tipc_link *l_ptr; |
bbfbe47c | 1528 | struct tipc_node *n_ptr; |
886eaa1f | 1529 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1530 | int i; |
b97bf3fd | 1531 | |
e099e86c | 1532 | *bearer_id = 0; |
6c7a762e | 1533 | rcu_read_lock(); |
f2f9800d | 1534 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1535 | tipc_node_lock(n_ptr); |
bbfbe47c | 1536 | for (i = 0; i < MAX_BEARERS; i++) { |
9d13ec65 | 1537 | l_ptr = n_ptr->links[i].link; |
e099e86c JPM |
1538 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1539 | *bearer_id = i; | |
1540 | found_node = n_ptr; | |
1541 | break; | |
1542 | } | |
bbfbe47c | 1543 | } |
a11607f5 | 1544 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1545 | if (found_node) |
1546 | break; | |
bbfbe47c | 1547 | } |
6c7a762e YX |
1548 | rcu_read_unlock(); |
1549 | ||
e099e86c | 1550 | return found_node; |
b97bf3fd PL |
1551 | } |
1552 | ||
b97bf3fd PL |
1553 | /** |
1554 | * link_reset_statistics - reset link statistics | |
1555 | * @l_ptr: pointer to link | |
1556 | */ | |
a18c4bc3 | 1557 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1558 | { |
1559 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
a97b9d3f JPM |
1560 | l_ptr->stats.sent_info = l_ptr->snd_nxt; |
1561 | l_ptr->stats.recv_info = l_ptr->rcv_nxt; | |
b97bf3fd PL |
1562 | } |
1563 | ||
1a20cc25 | 1564 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1565 | { |
1a20cc25 | 1566 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 1567 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 1568 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 1569 | |
662921cd | 1570 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1571 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1572 | skb_queue_len(&l->transmq), head, tail, | |
1573 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1574 | } |
0655f6a8 RA |
1575 | |
1576 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1577 | */ | |
1578 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1579 | { | |
1580 | int err; | |
1581 | ||
1582 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1583 | tipc_nl_prop_policy); | |
1584 | if (err) | |
1585 | return err; | |
1586 | ||
1587 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1588 | u32 prio; | |
1589 | ||
1590 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1591 | if (prio > TIPC_MAX_LINK_PRI) | |
1592 | return -EINVAL; | |
1593 | } | |
1594 | ||
1595 | if (props[TIPC_NLA_PROP_TOL]) { | |
1596 | u32 tol; | |
1597 | ||
1598 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1599 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1600 | return -EINVAL; | |
1601 | } | |
1602 | ||
1603 | if (props[TIPC_NLA_PROP_WIN]) { | |
1604 | u32 win; | |
1605 | ||
1606 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1607 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1608 | return -EINVAL; | |
1609 | } | |
1610 | ||
1611 | return 0; | |
1612 | } | |
7be57fc6 | 1613 | |
f96ce7a2 RA |
1614 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
1615 | { | |
1616 | int err; | |
1617 | int res = 0; | |
1618 | int bearer_id; | |
1619 | char *name; | |
1620 | struct tipc_link *link; | |
1621 | struct tipc_node *node; | |
1622 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
37e2d484 | 1623 | struct net *net = sock_net(skb->sk); |
f96ce7a2 RA |
1624 | |
1625 | if (!info->attrs[TIPC_NLA_LINK]) | |
1626 | return -EINVAL; | |
1627 | ||
1628 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1629 | info->attrs[TIPC_NLA_LINK], | |
1630 | tipc_nl_link_policy); | |
1631 | if (err) | |
1632 | return err; | |
1633 | ||
1634 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1635 | return -EINVAL; | |
1636 | ||
1637 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1638 | ||
670f4f88 RA |
1639 | if (strcmp(name, tipc_bclink_name) == 0) |
1640 | return tipc_nl_bc_link_set(net, attrs); | |
1641 | ||
f2f9800d | 1642 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
1643 | if (!node) |
1644 | return -EINVAL; | |
1645 | ||
1646 | tipc_node_lock(node); | |
1647 | ||
9d13ec65 | 1648 | link = node->links[bearer_id].link; |
f96ce7a2 RA |
1649 | if (!link) { |
1650 | res = -EINVAL; | |
1651 | goto out; | |
1652 | } | |
1653 | ||
1654 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
1655 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
1656 | ||
1657 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
1658 | props); | |
1659 | if (err) { | |
1660 | res = err; | |
1661 | goto out; | |
1662 | } | |
1663 | ||
1664 | if (props[TIPC_NLA_PROP_TOL]) { | |
1665 | u32 tol; | |
1666 | ||
1667 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
8a1577c9 | 1668 | link->tolerance = tol; |
ed193ece | 1669 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0); |
f96ce7a2 RA |
1670 | } |
1671 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1672 | u32 prio; | |
1673 | ||
1674 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1675 | link->priority = prio; | |
ed193ece | 1676 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio); |
f96ce7a2 RA |
1677 | } |
1678 | if (props[TIPC_NLA_PROP_WIN]) { | |
1679 | u32 win; | |
1680 | ||
1681 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1682 | tipc_link_set_queue_limits(link, win); | |
1683 | } | |
1684 | } | |
1685 | ||
1686 | out: | |
1687 | tipc_node_unlock(node); | |
1688 | ||
1689 | return res; | |
1690 | } | |
d8182804 RA |
1691 | |
1692 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
1693 | { |
1694 | int i; | |
1695 | struct nlattr *stats; | |
1696 | ||
1697 | struct nla_map { | |
1698 | u32 key; | |
1699 | u32 val; | |
1700 | }; | |
1701 | ||
1702 | struct nla_map map[] = { | |
1703 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1704 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1705 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1706 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1707 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
1708 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
1709 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
1710 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1711 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1712 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1713 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1714 | s->msg_length_counts : 1}, | |
1715 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1716 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1717 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1718 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1719 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1720 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1721 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1722 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1723 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1724 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1725 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1726 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1727 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1728 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1729 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1730 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1731 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1732 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1733 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1734 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1735 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1736 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1737 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1738 | }; | |
1739 | ||
1740 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1741 | if (!stats) | |
1742 | return -EMSGSIZE; | |
1743 | ||
1744 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1745 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1746 | goto msg_full; | |
1747 | ||
1748 | nla_nest_end(skb, stats); | |
1749 | ||
1750 | return 0; | |
1751 | msg_full: | |
1752 | nla_nest_cancel(skb, stats); | |
1753 | ||
1754 | return -EMSGSIZE; | |
1755 | } | |
1756 | ||
1757 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 | 1758 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
f2f67390 | 1759 | struct tipc_link *link, int nlflags) |
7be57fc6 RA |
1760 | { |
1761 | int err; | |
1762 | void *hdr; | |
1763 | struct nlattr *attrs; | |
1764 | struct nlattr *prop; | |
34747539 | 1765 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 1766 | |
bfb3e5dd | 1767 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1768 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1769 | if (!hdr) |
1770 | return -EMSGSIZE; | |
1771 | ||
1772 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1773 | if (!attrs) | |
1774 | goto msg_full; | |
1775 | ||
1776 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
1777 | goto attr_msg_full; | |
1778 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 1779 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 1780 | goto attr_msg_full; |
ed193ece | 1781 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 1782 | goto attr_msg_full; |
a97b9d3f | 1783 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
7be57fc6 | 1784 | goto attr_msg_full; |
a97b9d3f | 1785 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
7be57fc6 RA |
1786 | goto attr_msg_full; |
1787 | ||
1788 | if (tipc_link_is_up(link)) | |
1789 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1790 | goto attr_msg_full; | |
1791 | if (tipc_link_is_active(link)) | |
1792 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
1793 | goto attr_msg_full; | |
1794 | ||
1795 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1796 | if (!prop) | |
1797 | goto attr_msg_full; | |
1798 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1799 | goto prop_msg_full; | |
1800 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
1801 | goto prop_msg_full; | |
1802 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 1803 | link->window)) |
7be57fc6 RA |
1804 | goto prop_msg_full; |
1805 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1806 | goto prop_msg_full; | |
1807 | nla_nest_end(msg->skb, prop); | |
1808 | ||
1809 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
1810 | if (err) | |
1811 | goto attr_msg_full; | |
1812 | ||
1813 | nla_nest_end(msg->skb, attrs); | |
1814 | genlmsg_end(msg->skb, hdr); | |
1815 | ||
1816 | return 0; | |
1817 | ||
1818 | prop_msg_full: | |
1819 | nla_nest_cancel(msg->skb, prop); | |
1820 | attr_msg_full: | |
1821 | nla_nest_cancel(msg->skb, attrs); | |
1822 | msg_full: | |
1823 | genlmsg_cancel(msg->skb, hdr); | |
1824 | ||
1825 | return -EMSGSIZE; | |
1826 | } | |
1827 | ||
1828 | /* Caller should hold node lock */ | |
34747539 YX |
1829 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
1830 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
1831 | { |
1832 | u32 i; | |
1833 | int err; | |
1834 | ||
1835 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
1836 | *prev_link = i; | |
1837 | ||
9d13ec65 | 1838 | if (!node->links[i].link) |
7be57fc6 RA |
1839 | continue; |
1840 | ||
9d13ec65 JPM |
1841 | err = __tipc_nl_add_link(net, msg, |
1842 | node->links[i].link, NLM_F_MULTI); | |
7be57fc6 RA |
1843 | if (err) |
1844 | return err; | |
1845 | } | |
1846 | *prev_link = 0; | |
1847 | ||
1848 | return 0; | |
1849 | } | |
1850 | ||
1851 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1852 | { | |
f2f9800d YX |
1853 | struct net *net = sock_net(skb->sk); |
1854 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
1855 | struct tipc_node *node; |
1856 | struct tipc_nl_msg msg; | |
1857 | u32 prev_node = cb->args[0]; | |
1858 | u32 prev_link = cb->args[1]; | |
1859 | int done = cb->args[2]; | |
1860 | int err; | |
1861 | ||
1862 | if (done) | |
1863 | return 0; | |
1864 | ||
1865 | msg.skb = skb; | |
1866 | msg.portid = NETLINK_CB(cb->skb).portid; | |
1867 | msg.seq = cb->nlh->nlmsg_seq; | |
1868 | ||
1869 | rcu_read_lock(); | |
7be57fc6 | 1870 | if (prev_node) { |
f2f9800d | 1871 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
1872 | if (!node) { |
1873 | /* We never set seq or call nl_dump_check_consistent() | |
1874 | * this means that setting prev_seq here will cause the | |
1875 | * consistence check to fail in the netlink callback | |
1876 | * handler. Resulting in the last NLMSG_DONE message | |
1877 | * having the NLM_F_DUMP_INTR flag set. | |
1878 | */ | |
1879 | cb->prev_seq = 1; | |
1880 | goto out; | |
1881 | } | |
8a0f6ebe | 1882 | tipc_node_put(node); |
7be57fc6 | 1883 | |
f2f9800d YX |
1884 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
1885 | list) { | |
7be57fc6 | 1886 | tipc_node_lock(node); |
34747539 YX |
1887 | err = __tipc_nl_add_node_links(net, &msg, node, |
1888 | &prev_link); | |
7be57fc6 RA |
1889 | tipc_node_unlock(node); |
1890 | if (err) | |
1891 | goto out; | |
1892 | ||
1893 | prev_node = node->addr; | |
1894 | } | |
1895 | } else { | |
1da46568 | 1896 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
1897 | if (err) |
1898 | goto out; | |
1899 | ||
f2f9800d | 1900 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 1901 | tipc_node_lock(node); |
34747539 YX |
1902 | err = __tipc_nl_add_node_links(net, &msg, node, |
1903 | &prev_link); | |
7be57fc6 RA |
1904 | tipc_node_unlock(node); |
1905 | if (err) | |
1906 | goto out; | |
1907 | ||
1908 | prev_node = node->addr; | |
1909 | } | |
1910 | } | |
1911 | done = 1; | |
1912 | out: | |
1913 | rcu_read_unlock(); | |
1914 | ||
1915 | cb->args[0] = prev_node; | |
1916 | cb->args[1] = prev_link; | |
1917 | cb->args[2] = done; | |
1918 | ||
1919 | return skb->len; | |
1920 | } | |
1921 | ||
1922 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
1923 | { | |
f2f9800d | 1924 | struct net *net = genl_info_net(info); |
7be57fc6 | 1925 | struct tipc_nl_msg msg; |
7be57fc6 | 1926 | char *name; |
7be57fc6 RA |
1927 | int err; |
1928 | ||
670f4f88 RA |
1929 | msg.portid = info->snd_portid; |
1930 | msg.seq = info->snd_seq; | |
1931 | ||
7be57fc6 RA |
1932 | if (!info->attrs[TIPC_NLA_LINK_NAME]) |
1933 | return -EINVAL; | |
7be57fc6 | 1934 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); |
7be57fc6 | 1935 | |
670f4f88 RA |
1936 | msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1937 | if (!msg.skb) | |
7be57fc6 RA |
1938 | return -ENOMEM; |
1939 | ||
670f4f88 RA |
1940 | if (strcmp(name, tipc_bclink_name) == 0) { |
1941 | err = tipc_nl_add_bc_link(net, &msg); | |
1942 | if (err) { | |
1943 | nlmsg_free(msg.skb); | |
1944 | return err; | |
1945 | } | |
1946 | } else { | |
1947 | int bearer_id; | |
1948 | struct tipc_node *node; | |
1949 | struct tipc_link *link; | |
7be57fc6 | 1950 | |
670f4f88 RA |
1951 | node = tipc_link_find_owner(net, name, &bearer_id); |
1952 | if (!node) | |
1953 | return -EINVAL; | |
7be57fc6 | 1954 | |
670f4f88 | 1955 | tipc_node_lock(node); |
9d13ec65 | 1956 | link = node->links[bearer_id].link; |
670f4f88 RA |
1957 | if (!link) { |
1958 | tipc_node_unlock(node); | |
1959 | nlmsg_free(msg.skb); | |
1960 | return -EINVAL; | |
1961 | } | |
7be57fc6 | 1962 | |
670f4f88 RA |
1963 | err = __tipc_nl_add_link(net, &msg, link, 0); |
1964 | tipc_node_unlock(node); | |
1965 | if (err) { | |
1966 | nlmsg_free(msg.skb); | |
1967 | return err; | |
1968 | } | |
1969 | } | |
7be57fc6 | 1970 | |
670f4f88 | 1971 | return genlmsg_reply(msg.skb, info); |
7be57fc6 | 1972 | } |
ae36342b RA |
1973 | |
1974 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
1975 | { | |
1976 | int err; | |
1977 | char *link_name; | |
1978 | unsigned int bearer_id; | |
1979 | struct tipc_link *link; | |
1980 | struct tipc_node *node; | |
1981 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
1817877b | 1982 | struct net *net = sock_net(skb->sk); |
ae36342b RA |
1983 | |
1984 | if (!info->attrs[TIPC_NLA_LINK]) | |
1985 | return -EINVAL; | |
1986 | ||
1987 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1988 | info->attrs[TIPC_NLA_LINK], | |
1989 | tipc_nl_link_policy); | |
1990 | if (err) | |
1991 | return err; | |
1992 | ||
1993 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1994 | return -EINVAL; | |
1995 | ||
1996 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1997 | ||
1998 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 1999 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
2000 | if (err) |
2001 | return err; | |
2002 | return 0; | |
2003 | } | |
2004 | ||
f2f9800d | 2005 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2006 | if (!node) |
2007 | return -EINVAL; | |
2008 | ||
2009 | tipc_node_lock(node); | |
2010 | ||
9d13ec65 | 2011 | link = node->links[bearer_id].link; |
ae36342b RA |
2012 | if (!link) { |
2013 | tipc_node_unlock(node); | |
2014 | return -EINVAL; | |
2015 | } | |
2016 | ||
2017 | link_reset_statistics(link); | |
2018 | ||
2019 | tipc_node_unlock(node); | |
2020 | ||
2021 | return 0; | |
2022 | } |