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 "; |
7be57fc6 | 53 | |
0655f6a8 RA |
54 | /* Properties valid for media, bearar and link */ |
55 | static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { | |
56 | [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, | |
57 | [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, | |
58 | [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, | |
59 | [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } | |
60 | }; | |
61 | ||
52666986 JPM |
62 | /* Send states for broadcast NACKs |
63 | */ | |
64 | enum { | |
65 | BC_NACK_SND_CONDITIONAL, | |
66 | BC_NACK_SND_UNCONDITIONAL, | |
67 | BC_NACK_SND_SUPPRESS, | |
68 | }; | |
69 | ||
d999297c JPM |
70 | /* |
71 | * Interval between NACKs when packets arrive out of order | |
72 | */ | |
73 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
a686e685 AS |
74 | /* |
75 | * Out-of-range value for link session numbers | |
76 | */ | |
d3504c34 | 77 | #define WILDCARD_SESSION 0x10000 |
a686e685 | 78 | |
662921cd | 79 | /* Link FSM states: |
b97bf3fd | 80 | */ |
d3504c34 | 81 | enum { |
662921cd JPM |
82 | LINK_ESTABLISHED = 0xe, |
83 | LINK_ESTABLISHING = 0xe << 4, | |
84 | LINK_RESET = 0x1 << 8, | |
85 | LINK_RESETTING = 0x2 << 12, | |
86 | LINK_PEER_RESET = 0xd << 16, | |
87 | LINK_FAILINGOVER = 0xf << 20, | |
88 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
89 | }; |
90 | ||
91 | /* Link FSM state checking routines | |
92 | */ | |
662921cd | 93 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 94 | { |
662921cd | 95 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 96 | } |
b97bf3fd | 97 | |
d999297c JPM |
98 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
99 | struct sk_buff_head *xmitq); | |
426cc2b8 JPM |
100 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
101 | u16 rcvgap, int tolerance, int priority, | |
102 | struct sk_buff_head *xmitq); | |
a18c4bc3 | 103 | static void link_print(struct tipc_link *l_ptr, const char *str); |
52666986 JPM |
104 | static void tipc_link_build_nack_msg(struct tipc_link *l, |
105 | struct sk_buff_head *xmitq); | |
106 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, | |
107 | struct sk_buff_head *xmitq); | |
108 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); | |
8b4ed863 | 109 | |
b97bf3fd | 110 | /* |
05790c64 | 111 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 112 | */ |
662921cd | 113 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 114 | { |
662921cd JPM |
115 | return link_is_up(l); |
116 | } | |
117 | ||
c8199300 JPM |
118 | bool tipc_link_peer_is_down(struct tipc_link *l) |
119 | { | |
120 | return l->state == LINK_PEER_RESET; | |
121 | } | |
122 | ||
662921cd JPM |
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 | ||
742e0383 | 148 | static bool link_is_bc_sndlink(struct tipc_link *l) |
52666986 JPM |
149 | { |
150 | return !l->bc_sndlink; | |
151 | } | |
152 | ||
742e0383 | 153 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
52666986 JPM |
154 | { |
155 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); | |
156 | } | |
157 | ||
9d13ec65 | 158 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 159 | { |
c72fa872 JPM |
160 | return l->active; |
161 | } | |
9d13ec65 | 162 | |
c72fa872 JPM |
163 | void tipc_link_set_active(struct tipc_link *l, bool active) |
164 | { | |
165 | l->active = active; | |
b97bf3fd PL |
166 | } |
167 | ||
52666986 JPM |
168 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
169 | struct tipc_link *uc_l, | |
170 | struct sk_buff_head *xmitq) | |
2f566124 | 171 | { |
52666986 JPM |
172 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
173 | ||
174 | snd_l->ackers++; | |
175 | rcv_l->acked = snd_l->snd_nxt - 1; | |
176 | tipc_link_build_bc_init_msg(uc_l, xmitq); | |
2f566124 JPM |
177 | } |
178 | ||
52666986 JPM |
179 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
180 | struct tipc_link *rcv_l, | |
181 | struct sk_buff_head *xmitq) | |
2f566124 | 182 | { |
52666986 JPM |
183 | u16 ack = snd_l->snd_nxt - 1; |
184 | ||
185 | snd_l->ackers--; | |
186 | tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); | |
187 | tipc_link_reset(rcv_l); | |
188 | rcv_l->state = LINK_RESET; | |
189 | if (!snd_l->ackers) { | |
190 | tipc_link_reset(snd_l); | |
191 | __skb_queue_purge(xmitq); | |
192 | } | |
2f566124 JPM |
193 | } |
194 | ||
195 | int tipc_link_bc_peers(struct tipc_link *l) | |
196 | { | |
197 | return l->ackers; | |
198 | } | |
199 | ||
959e1781 JPM |
200 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
201 | { | |
202 | l->mtu = mtu; | |
203 | } | |
204 | ||
205 | int tipc_link_mtu(struct tipc_link *l) | |
206 | { | |
207 | return l->mtu; | |
208 | } | |
209 | ||
440d8963 JPM |
210 | static u32 link_own_addr(struct tipc_link *l) |
211 | { | |
212 | return msg_prevnode(l->pmsg); | |
213 | } | |
214 | ||
b97bf3fd | 215 | /** |
4323add6 | 216 | * tipc_link_create - create a new link |
440d8963 | 217 | * @n: pointer to associated node |
0e05498e JPM |
218 | * @if_name: associated interface name |
219 | * @bearer_id: id (index) of associated bearer | |
220 | * @tolerance: link tolerance to be used by link | |
221 | * @net_plane: network plane (A,B,c..) this link belongs to | |
222 | * @mtu: mtu to be advertised by link | |
223 | * @priority: priority to be used by link | |
224 | * @window: send window to be used by link | |
225 | * @session: session to be used by link | |
440d8963 | 226 | * @ownnode: identity of own node |
0e05498e | 227 | * @peer: node id of peer node |
fd556f20 | 228 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
229 | * @bc_sndlink: the namespace global link used for broadcast sending |
230 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
231 | * @inputq: queue to put messages ready for delivery |
232 | * @namedq: queue to put binding table update messages ready for delivery | |
233 | * @link: return value, pointer to put the created link | |
c4307285 | 234 | * |
440d8963 | 235 | * Returns true if link was created, otherwise false |
b97bf3fd | 236 | */ |
c72fa872 | 237 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e JPM |
238 | int tolerance, char net_plane, u32 mtu, int priority, |
239 | int window, u32 session, u32 ownnode, u32 peer, | |
52666986 | 240 | u16 peer_caps, |
52666986 JPM |
241 | struct tipc_link *bc_sndlink, |
242 | struct tipc_link *bc_rcvlink, | |
243 | struct sk_buff_head *inputq, | |
244 | struct sk_buff_head *namedq, | |
440d8963 | 245 | struct tipc_link **link) |
b97bf3fd | 246 | { |
440d8963 JPM |
247 | struct tipc_link *l; |
248 | struct tipc_msg *hdr; | |
37b9c08a | 249 | |
440d8963 JPM |
250 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
251 | if (!l) | |
252 | return false; | |
253 | *link = l; | |
0e05498e JPM |
254 | l->pmsg = (struct tipc_msg *)&l->proto_msg; |
255 | hdr = l->pmsg; | |
256 | tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer); | |
257 | msg_set_size(hdr, sizeof(l->proto_msg)); | |
258 | msg_set_session(hdr, session); | |
259 | msg_set_bearer_id(hdr, l->bearer_id); | |
37b9c08a | 260 | |
440d8963 | 261 | /* Note: peer i/f name is completed by reset/activate message */ |
440d8963 JPM |
262 | sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
263 | tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode), | |
264 | if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
0e05498e | 265 | strcpy((char *)msg_data(hdr), if_name); |
b97bf3fd | 266 | |
440d8963 | 267 | l->addr = peer; |
fd556f20 | 268 | l->peer_caps = peer_caps; |
c72fa872 | 269 | l->net = net; |
440d8963 | 270 | l->peer_session = WILDCARD_SESSION; |
0e05498e JPM |
271 | l->bearer_id = bearer_id; |
272 | l->tolerance = tolerance; | |
273 | l->net_plane = net_plane; | |
274 | l->advertised_mtu = mtu; | |
275 | l->mtu = mtu; | |
276 | l->priority = priority; | |
277 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 278 | l->ackers = 1; |
52666986 JPM |
279 | l->bc_sndlink = bc_sndlink; |
280 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
281 | l->inputq = inputq; |
282 | l->namedq = namedq; | |
283 | l->state = LINK_RESETTING; | |
440d8963 JPM |
284 | __skb_queue_head_init(&l->transmq); |
285 | __skb_queue_head_init(&l->backlogq); | |
286 | __skb_queue_head_init(&l->deferdq); | |
287 | skb_queue_head_init(&l->wakeupq); | |
288 | skb_queue_head_init(l->inputq); | |
289 | return true; | |
b97bf3fd PL |
290 | } |
291 | ||
32301906 JPM |
292 | /** |
293 | * tipc_link_bc_create - create new link to be used for broadcast | |
294 | * @n: pointer to associated node | |
295 | * @mtu: mtu to be used | |
296 | * @window: send window to be used | |
297 | * @inputq: queue to put messages ready for delivery | |
298 | * @namedq: queue to put binding table update messages ready for delivery | |
299 | * @link: return value, pointer to put the created link | |
300 | * | |
301 | * Returns true if link was created, otherwise false | |
302 | */ | |
c72fa872 | 303 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
52666986 | 304 | int mtu, int window, u16 peer_caps, |
32301906 JPM |
305 | struct sk_buff_head *inputq, |
306 | struct sk_buff_head *namedq, | |
52666986 | 307 | struct tipc_link *bc_sndlink, |
32301906 JPM |
308 | struct tipc_link **link) |
309 | { | |
310 | struct tipc_link *l; | |
311 | ||
c72fa872 | 312 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
2af5ae37 | 313 | 0, ownnode, peer, peer_caps, bc_sndlink, |
52666986 | 314 | NULL, inputq, namedq, link)) |
32301906 JPM |
315 | return false; |
316 | ||
317 | l = *link; | |
318 | strcpy(l->name, tipc_bclink_name); | |
319 | tipc_link_reset(l); | |
52666986 | 320 | l->state = LINK_RESET; |
2f566124 | 321 | l->ackers = 0; |
52666986 | 322 | l->bc_rcvlink = l; |
32301906 | 323 | |
52666986 JPM |
324 | /* Broadcast send link is always up */ |
325 | if (link_is_bc_sndlink(l)) | |
326 | l->state = LINK_ESTABLISHED; | |
d999297c | 327 | |
52666986 | 328 | return true; |
d999297c JPM |
329 | } |
330 | ||
6ab30f9c JPM |
331 | /** |
332 | * tipc_link_fsm_evt - link finite state machine | |
333 | * @l: pointer to link | |
334 | * @evt: state machine event to be processed | |
6ab30f9c | 335 | */ |
662921cd | 336 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 337 | { |
5045f7b9 | 338 | int rc = 0; |
6ab30f9c JPM |
339 | |
340 | switch (l->state) { | |
662921cd | 341 | case LINK_RESETTING: |
6ab30f9c | 342 | switch (evt) { |
662921cd JPM |
343 | case LINK_PEER_RESET_EVT: |
344 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 345 | break; |
662921cd JPM |
346 | case LINK_RESET_EVT: |
347 | l->state = LINK_RESET; | |
348 | break; | |
349 | case LINK_FAILURE_EVT: | |
350 | case LINK_FAILOVER_BEGIN_EVT: | |
351 | case LINK_ESTABLISH_EVT: | |
352 | case LINK_FAILOVER_END_EVT: | |
353 | case LINK_SYNCH_BEGIN_EVT: | |
354 | case LINK_SYNCH_END_EVT: | |
355 | default: | |
356 | goto illegal_evt; | |
357 | } | |
358 | break; | |
359 | case LINK_RESET: | |
360 | switch (evt) { | |
361 | case LINK_PEER_RESET_EVT: | |
362 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 363 | break; |
662921cd JPM |
364 | case LINK_FAILOVER_BEGIN_EVT: |
365 | l->state = LINK_FAILINGOVER; | |
366 | case LINK_FAILURE_EVT: | |
367 | case LINK_RESET_EVT: | |
368 | case LINK_ESTABLISH_EVT: | |
369 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 370 | break; |
662921cd JPM |
371 | case LINK_SYNCH_BEGIN_EVT: |
372 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 373 | default: |
662921cd | 374 | goto illegal_evt; |
6ab30f9c JPM |
375 | } |
376 | break; | |
662921cd | 377 | case LINK_PEER_RESET: |
6ab30f9c | 378 | switch (evt) { |
662921cd JPM |
379 | case LINK_RESET_EVT: |
380 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 381 | break; |
662921cd JPM |
382 | case LINK_PEER_RESET_EVT: |
383 | case LINK_ESTABLISH_EVT: | |
384 | case LINK_FAILURE_EVT: | |
6ab30f9c | 385 | break; |
662921cd JPM |
386 | case LINK_SYNCH_BEGIN_EVT: |
387 | case LINK_SYNCH_END_EVT: | |
388 | case LINK_FAILOVER_BEGIN_EVT: | |
389 | case LINK_FAILOVER_END_EVT: | |
390 | default: | |
391 | goto illegal_evt; | |
392 | } | |
393 | break; | |
394 | case LINK_FAILINGOVER: | |
395 | switch (evt) { | |
396 | case LINK_FAILOVER_END_EVT: | |
397 | l->state = LINK_RESET; | |
6ab30f9c | 398 | break; |
662921cd JPM |
399 | case LINK_PEER_RESET_EVT: |
400 | case LINK_RESET_EVT: | |
401 | case LINK_ESTABLISH_EVT: | |
402 | case LINK_FAILURE_EVT: | |
403 | break; | |
404 | case LINK_FAILOVER_BEGIN_EVT: | |
405 | case LINK_SYNCH_BEGIN_EVT: | |
406 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 407 | default: |
662921cd | 408 | goto illegal_evt; |
6ab30f9c JPM |
409 | } |
410 | break; | |
662921cd | 411 | case LINK_ESTABLISHING: |
6ab30f9c | 412 | switch (evt) { |
662921cd JPM |
413 | case LINK_ESTABLISH_EVT: |
414 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 415 | break; |
662921cd JPM |
416 | case LINK_FAILOVER_BEGIN_EVT: |
417 | l->state = LINK_FAILINGOVER; | |
418 | break; | |
662921cd | 419 | case LINK_RESET_EVT: |
73f646ce JPM |
420 | l->state = LINK_RESET; |
421 | break; | |
662921cd | 422 | case LINK_FAILURE_EVT: |
73f646ce | 423 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
424 | case LINK_SYNCH_BEGIN_EVT: |
425 | case LINK_FAILOVER_END_EVT: | |
426 | break; | |
427 | case LINK_SYNCH_END_EVT: | |
428 | default: | |
429 | goto illegal_evt; | |
430 | } | |
431 | break; | |
432 | case LINK_ESTABLISHED: | |
433 | switch (evt) { | |
434 | case LINK_PEER_RESET_EVT: | |
435 | l->state = LINK_PEER_RESET; | |
436 | rc |= TIPC_LINK_DOWN_EVT; | |
437 | break; | |
438 | case LINK_FAILURE_EVT: | |
439 | l->state = LINK_RESETTING; | |
440 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 441 | break; |
662921cd JPM |
442 | case LINK_RESET_EVT: |
443 | l->state = LINK_RESET; | |
6ab30f9c | 444 | break; |
662921cd | 445 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 446 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 447 | break; |
662921cd JPM |
448 | case LINK_SYNCH_BEGIN_EVT: |
449 | l->state = LINK_SYNCHING; | |
450 | break; | |
662921cd JPM |
451 | case LINK_FAILOVER_BEGIN_EVT: |
452 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 453 | default: |
662921cd | 454 | goto illegal_evt; |
6ab30f9c JPM |
455 | } |
456 | break; | |
662921cd | 457 | case LINK_SYNCHING: |
6ab30f9c | 458 | switch (evt) { |
662921cd JPM |
459 | case LINK_PEER_RESET_EVT: |
460 | l->state = LINK_PEER_RESET; | |
461 | rc |= TIPC_LINK_DOWN_EVT; | |
462 | break; | |
463 | case LINK_FAILURE_EVT: | |
464 | l->state = LINK_RESETTING; | |
465 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 466 | break; |
662921cd JPM |
467 | case LINK_RESET_EVT: |
468 | l->state = LINK_RESET; | |
6ab30f9c | 469 | break; |
662921cd JPM |
470 | case LINK_ESTABLISH_EVT: |
471 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 472 | break; |
662921cd JPM |
473 | case LINK_SYNCH_END_EVT: |
474 | l->state = LINK_ESTABLISHED; | |
475 | break; | |
476 | case LINK_FAILOVER_BEGIN_EVT: | |
477 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 478 | default: |
662921cd | 479 | goto illegal_evt; |
6ab30f9c JPM |
480 | } |
481 | break; | |
482 | default: | |
662921cd | 483 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 484 | } |
662921cd JPM |
485 | return rc; |
486 | illegal_evt: | |
487 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
488 | evt, l->state, l->name); | |
6ab30f9c JPM |
489 | return rc; |
490 | } | |
491 | ||
333ef69e JPM |
492 | /* link_profile_stats - update statistical profiling of traffic |
493 | */ | |
494 | static void link_profile_stats(struct tipc_link *l) | |
495 | { | |
496 | struct sk_buff *skb; | |
497 | struct tipc_msg *msg; | |
498 | int length; | |
499 | ||
500 | /* Update counters used in statistical profiling of send traffic */ | |
501 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
502 | l->stats.queue_sz_counts++; | |
503 | ||
504 | skb = skb_peek(&l->transmq); | |
505 | if (!skb) | |
506 | return; | |
507 | msg = buf_msg(skb); | |
508 | length = msg_size(msg); | |
509 | ||
510 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
511 | if (msg_type(msg) != FIRST_FRAGMENT) | |
512 | return; | |
513 | length = msg_size(msg_get_wrapped(msg)); | |
514 | } | |
515 | l->stats.msg_lengths_total += length; | |
516 | l->stats.msg_length_counts++; | |
517 | if (length <= 64) | |
518 | l->stats.msg_length_profile[0]++; | |
519 | else if (length <= 256) | |
520 | l->stats.msg_length_profile[1]++; | |
521 | else if (length <= 1024) | |
522 | l->stats.msg_length_profile[2]++; | |
523 | else if (length <= 4096) | |
524 | l->stats.msg_length_profile[3]++; | |
525 | else if (length <= 16384) | |
526 | l->stats.msg_length_profile[4]++; | |
527 | else if (length <= 32768) | |
528 | l->stats.msg_length_profile[5]++; | |
529 | else | |
530 | l->stats.msg_length_profile[6]++; | |
531 | } | |
532 | ||
52666986 JPM |
533 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
534 | */ | |
333ef69e JPM |
535 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
536 | */ | |
537 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
538 | { | |
539 | int rc = 0; | |
5045f7b9 JPM |
540 | int mtyp = STATE_MSG; |
541 | bool xmit = false; | |
542 | bool prb = false; | |
52666986 JPM |
543 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
544 | u16 bc_acked = l->bc_rcvlink->acked; | |
545 | bool bc_up = link_is_up(l->bc_rcvlink); | |
333ef69e JPM |
546 | |
547 | link_profile_stats(l); | |
5045f7b9 | 548 | |
662921cd JPM |
549 | switch (l->state) { |
550 | case LINK_ESTABLISHED: | |
551 | case LINK_SYNCHING: | |
5045f7b9 | 552 | if (!l->silent_intv_cnt) { |
52666986 | 553 | if (bc_up && (bc_acked != bc_snt)) |
5045f7b9 JPM |
554 | xmit = true; |
555 | } else if (l->silent_intv_cnt <= l->abort_limit) { | |
556 | xmit = true; | |
557 | prb = true; | |
558 | } else { | |
662921cd | 559 | rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
5045f7b9 JPM |
560 | } |
561 | l->silent_intv_cnt++; | |
662921cd JPM |
562 | break; |
563 | case LINK_RESET: | |
5045f7b9 JPM |
564 | xmit = true; |
565 | mtyp = RESET_MSG; | |
662921cd JPM |
566 | break; |
567 | case LINK_ESTABLISHING: | |
5045f7b9 JPM |
568 | xmit = true; |
569 | mtyp = ACTIVATE_MSG; | |
662921cd | 570 | break; |
662921cd | 571 | case LINK_PEER_RESET: |
598411d7 | 572 | case LINK_RESETTING: |
662921cd JPM |
573 | case LINK_FAILINGOVER: |
574 | break; | |
575 | default: | |
576 | break; | |
5045f7b9 | 577 | } |
662921cd | 578 | |
5045f7b9 JPM |
579 | if (xmit) |
580 | tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq); | |
581 | ||
333ef69e JPM |
582 | return rc; |
583 | } | |
584 | ||
b97bf3fd | 585 | /** |
3127a020 | 586 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 587 | * @link: congested link |
3127a020 | 588 | * @list: message that was attempted sent |
50100a5e | 589 | * Create pseudo msg to send back to user when congestion abates |
22d85c79 | 590 | * Does not consume buffer list |
b97bf3fd | 591 | */ |
3127a020 | 592 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 593 | { |
3127a020 JPM |
594 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
595 | int imp = msg_importance(msg); | |
596 | u32 oport = msg_origport(msg); | |
597 | u32 addr = link_own_addr(link); | |
598 | struct sk_buff *skb; | |
599 | ||
600 | /* This really cannot happen... */ | |
601 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
602 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
22d85c79 | 603 | return -ENOBUFS; |
3127a020 JPM |
604 | } |
605 | /* Non-blocking sender: */ | |
606 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
607 | return -ELINKCONG; | |
608 | ||
609 | /* Create and schedule wakeup pseudo message */ | |
610 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
611 | addr, addr, oport, 0, 0); | |
612 | if (!skb) | |
22d85c79 | 613 | return -ENOBUFS; |
3127a020 JPM |
614 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); |
615 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
616 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 617 | link->stats.link_congs++; |
3127a020 | 618 | return -ELINKCONG; |
b97bf3fd PL |
619 | } |
620 | ||
50100a5e JPM |
621 | /** |
622 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
623 | * @link: congested link | |
624 | * Move a number of waiting users, as permitted by available space in | |
625 | * the send queue, from link wait queue to node wait queue for wakeup | |
626 | */ | |
1f66d161 | 627 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 628 | { |
1f66d161 JPM |
629 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
630 | int imp, lim; | |
58d78b32 | 631 | struct sk_buff *skb, *tmp; |
50100a5e | 632 | |
1f66d161 JPM |
633 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
634 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
635 | lim = l->window + l->backlog[imp].limit; | |
636 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
637 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 638 | break; |
1f66d161 | 639 | skb_unlink(skb, &l->wakeupq); |
d39bbd44 | 640 | skb_queue_tail(l->inputq, skb); |
b97bf3fd | 641 | } |
b97bf3fd PL |
642 | } |
643 | ||
6e498158 | 644 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 645 | { |
a686e685 | 646 | /* Link is down, accept any session */ |
6e498158 | 647 | l->peer_session = WILDCARD_SESSION; |
b97bf3fd | 648 | |
6e498158 JPM |
649 | /* If peer is up, it only accepts an incremented session number */ |
650 | msg_set_session(l->pmsg, msg_session(l->pmsg) + 1); | |
b97bf3fd | 651 | |
6e498158 JPM |
652 | /* Prepare for renewed mtu size negotiation */ |
653 | l->mtu = l->advertised_mtu; | |
b97bf3fd | 654 | |
2af5ae37 | 655 | /* Clean up all queues and counters: */ |
6e498158 JPM |
656 | __skb_queue_purge(&l->transmq); |
657 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 658 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
2af5ae37 JPM |
659 | __skb_queue_purge(&l->backlogq); |
660 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
661 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
662 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
663 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
664 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
6e498158 JPM |
665 | kfree_skb(l->reasm_buf); |
666 | kfree_skb(l->failover_reasm_skb); | |
667 | l->reasm_buf = NULL; | |
668 | l->failover_reasm_skb = NULL; | |
669 | l->rcv_unacked = 0; | |
670 | l->snd_nxt = 1; | |
671 | l->rcv_nxt = 1; | |
c1ab3f1d | 672 | l->acked = 0; |
6e498158 JPM |
673 | l->silent_intv_cnt = 0; |
674 | l->stats.recv_info = 0; | |
675 | l->stale_count = 0; | |
52666986 | 676 | l->bc_peer_is_up = false; |
6e498158 | 677 | link_reset_statistics(l); |
b97bf3fd PL |
678 | } |
679 | ||
af9b028e JPM |
680 | /** |
681 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
682 | * @link: link to use | |
683 | * @list: chain of buffers containing message | |
684 | * @xmitq: returned list of packets to be sent by caller | |
685 | * | |
686 | * Consumes the buffer chain, except when returning -ELINKCONG, | |
687 | * since the caller then may want to make more send attempts. | |
688 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
689 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
690 | */ | |
691 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
692 | struct sk_buff_head *xmitq) | |
693 | { | |
694 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
695 | unsigned int maxwin = l->window; | |
696 | unsigned int i, imp = msg_importance(hdr); | |
697 | unsigned int mtu = l->mtu; | |
698 | u16 ack = l->rcv_nxt - 1; | |
699 | u16 seqno = l->snd_nxt; | |
52666986 | 700 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
af9b028e JPM |
701 | struct sk_buff_head *transmq = &l->transmq; |
702 | struct sk_buff_head *backlogq = &l->backlogq; | |
703 | struct sk_buff *skb, *_skb, *bskb; | |
704 | ||
705 | /* Match msg importance against this and all higher backlog limits: */ | |
706 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
707 | if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) | |
708 | return link_schedule_user(l, list); | |
709 | } | |
710 | if (unlikely(msg_size(hdr) > mtu)) | |
711 | return -EMSGSIZE; | |
712 | ||
713 | /* Prepare each packet for sending, and add to relevant queue: */ | |
714 | while (skb_queue_len(list)) { | |
715 | skb = skb_peek(list); | |
716 | hdr = buf_msg(skb); | |
717 | msg_set_seqno(hdr, seqno); | |
718 | msg_set_ack(hdr, ack); | |
52666986 | 719 | msg_set_bcast_ack(hdr, bc_ack); |
af9b028e JPM |
720 | |
721 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
722 | _skb = skb_clone(skb, GFP_ATOMIC); | |
723 | if (!_skb) | |
724 | return -ENOBUFS; | |
725 | __skb_dequeue(list); | |
726 | __skb_queue_tail(transmq, skb); | |
727 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 728 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e JPM |
729 | l->rcv_unacked = 0; |
730 | seqno++; | |
731 | continue; | |
732 | } | |
733 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
734 | kfree_skb(__skb_dequeue(list)); | |
735 | l->stats.sent_bundled++; | |
736 | continue; | |
737 | } | |
738 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
739 | kfree_skb(__skb_dequeue(list)); | |
740 | __skb_queue_tail(backlogq, bskb); | |
741 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
742 | l->stats.sent_bundled++; | |
743 | l->stats.sent_bundles++; | |
744 | continue; | |
745 | } | |
746 | l->backlog[imp].len += skb_queue_len(list); | |
747 | skb_queue_splice_tail_init(list, backlogq); | |
748 | } | |
749 | l->snd_nxt = seqno; | |
750 | return 0; | |
751 | } | |
752 | ||
d999297c JPM |
753 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
754 | { | |
755 | struct sk_buff *skb, *_skb; | |
756 | struct tipc_msg *hdr; | |
757 | u16 seqno = l->snd_nxt; | |
758 | u16 ack = l->rcv_nxt - 1; | |
52666986 | 759 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
760 | |
761 | while (skb_queue_len(&l->transmq) < l->window) { | |
762 | skb = skb_peek(&l->backlogq); | |
763 | if (!skb) | |
764 | break; | |
765 | _skb = skb_clone(skb, GFP_ATOMIC); | |
766 | if (!_skb) | |
767 | break; | |
768 | __skb_dequeue(&l->backlogq); | |
769 | hdr = buf_msg(skb); | |
770 | l->backlog[msg_importance(hdr)].len--; | |
771 | __skb_queue_tail(&l->transmq, skb); | |
772 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 773 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 774 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
775 | msg_set_ack(hdr, ack); |
776 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
777 | l->rcv_unacked = 0; |
778 | seqno++; | |
779 | } | |
780 | l->snd_nxt = seqno; | |
781 | } | |
782 | ||
52666986 | 783 | static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb) |
d356eeba | 784 | { |
52666986 JPM |
785 | struct tipc_msg *hdr = buf_msg(skb); |
786 | ||
787 | pr_warn("Retransmission failure on link <%s>\n", l->name); | |
788 | link_print(l, "Resetting link "); | |
789 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
790 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
791 | pr_info("sqno %u, prev: %x, src: %x\n", | |
792 | msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr)); | |
d356eeba AS |
793 | } |
794 | ||
c1ab3f1d JPM |
795 | int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to, |
796 | struct sk_buff_head *xmitq) | |
d999297c JPM |
797 | { |
798 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
799 | struct tipc_msg *hdr; | |
c1ab3f1d | 800 | u16 ack = l->rcv_nxt - 1; |
52666986 | 801 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
802 | |
803 | if (!skb) | |
804 | return 0; | |
805 | ||
806 | /* Detect repeated retransmit failures on same packet */ | |
807 | if (likely(l->last_retransm != buf_seqno(skb))) { | |
808 | l->last_retransm = buf_seqno(skb); | |
809 | l->stale_count = 1; | |
810 | } else if (++l->stale_count > 100) { | |
811 | link_retransmit_failure(l, skb); | |
662921cd | 812 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c | 813 | } |
c1ab3f1d JPM |
814 | |
815 | /* Move forward to where retransmission should start */ | |
d999297c | 816 | skb_queue_walk(&l->transmq, skb) { |
c1ab3f1d JPM |
817 | if (!less(buf_seqno(skb), from)) |
818 | break; | |
819 | } | |
820 | ||
821 | skb_queue_walk_from(&l->transmq, skb) { | |
822 | if (more(buf_seqno(skb), to)) | |
823 | break; | |
d999297c JPM |
824 | hdr = buf_msg(skb); |
825 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); | |
826 | if (!_skb) | |
827 | return 0; | |
828 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
829 | msg_set_ack(hdr, ack); |
830 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
831 | _skb->priority = TC_PRIO_CONTROL; |
832 | __skb_queue_tail(xmitq, _skb); | |
d999297c JPM |
833 | l->stats.retransmitted++; |
834 | } | |
835 | return 0; | |
836 | } | |
837 | ||
c637c103 | 838 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 839 | * |
c637c103 | 840 | * Consumes buffer if message is of right type |
7ae934be EH |
841 | * Node lock must be held |
842 | */ | |
52666986 | 843 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 844 | struct sk_buff_head *inputq) |
7ae934be | 845 | { |
9073fb8b | 846 | switch (msg_user(buf_msg(skb))) { |
c637c103 JPM |
847 | case TIPC_LOW_IMPORTANCE: |
848 | case TIPC_MEDIUM_IMPORTANCE: | |
849 | case TIPC_HIGH_IMPORTANCE: | |
850 | case TIPC_CRITICAL_IMPORTANCE: | |
851 | case CONN_MANAGER: | |
9945e804 | 852 | skb_queue_tail(inputq, skb); |
c637c103 | 853 | return true; |
7ae934be | 854 | case NAME_DISTRIBUTOR: |
52666986 JPM |
855 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
856 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
857 | return true; |
858 | case MSG_BUNDLER: | |
dff29b1a | 859 | case TUNNEL_PROTOCOL: |
c637c103 | 860 | case MSG_FRAGMENTER: |
7ae934be | 861 | case BCAST_PROTOCOL: |
c637c103 | 862 | return false; |
7ae934be | 863 | default: |
c637c103 JPM |
864 | pr_warn("Dropping received illegal msg type\n"); |
865 | kfree_skb(skb); | |
866 | return false; | |
867 | }; | |
7ae934be | 868 | } |
c637c103 JPM |
869 | |
870 | /* tipc_link_input - process packet that has passed link protocol check | |
871 | * | |
872 | * Consumes buffer | |
7ae934be | 873 | */ |
9073fb8b JPM |
874 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
875 | struct sk_buff_head *inputq) | |
7ae934be | 876 | { |
6e498158 JPM |
877 | struct tipc_msg *hdr = buf_msg(skb); |
878 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 879 | struct sk_buff *iskb; |
9945e804 | 880 | struct sk_buff_head tmpq; |
6e498158 | 881 | int usr = msg_user(hdr); |
6144a996 | 882 | int rc = 0; |
6e498158 JPM |
883 | int pos = 0; |
884 | int ipos = 0; | |
c637c103 | 885 | |
6e498158 JPM |
886 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
887 | if (msg_type(hdr) == SYNCH_MSG) { | |
888 | __skb_queue_purge(&l->deferdq); | |
889 | goto drop; | |
8b4ed863 | 890 | } |
6e498158 JPM |
891 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
892 | return rc; | |
893 | kfree_skb(skb); | |
894 | skb = iskb; | |
895 | hdr = buf_msg(skb); | |
896 | if (less(msg_seqno(hdr), l->drop_point)) | |
897 | goto drop; | |
9073fb8b | 898 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
899 | return rc; |
900 | usr = msg_user(hdr); | |
901 | reasm_skb = &l->failover_reasm_skb; | |
902 | } | |
c637c103 | 903 | |
6e498158 | 904 | if (usr == MSG_BUNDLER) { |
9945e804 | 905 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
906 | l->stats.recv_bundles++; |
907 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 908 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
909 | tipc_data_input(l, iskb, &tmpq); |
910 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 911 | return 0; |
6e498158 JPM |
912 | } else if (usr == MSG_FRAGMENTER) { |
913 | l->stats.recv_fragments++; | |
914 | if (tipc_buf_append(reasm_skb, &skb)) { | |
915 | l->stats.recv_fragmented++; | |
9073fb8b | 916 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
917 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
918 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 919 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 920 | } |
662921cd | 921 | return 0; |
6e498158 | 922 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 923 | tipc_bcast_lock(l->net); |
52666986 | 924 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 925 | tipc_bcast_unlock(l->net); |
6e498158 JPM |
926 | } |
927 | drop: | |
928 | kfree_skb(skb); | |
662921cd | 929 | return 0; |
7ae934be EH |
930 | } |
931 | ||
d999297c JPM |
932 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
933 | { | |
934 | bool released = false; | |
935 | struct sk_buff *skb, *tmp; | |
936 | ||
937 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
938 | if (more(buf_seqno(skb), acked)) | |
939 | break; | |
940 | __skb_unlink(skb, &l->transmq); | |
941 | kfree_skb(skb); | |
942 | released = true; | |
943 | } | |
944 | return released; | |
945 | } | |
946 | ||
f9aa358a | 947 | /* tipc_link_build_ack_msg: prepare link acknowledge message for transmission |
52666986 JPM |
948 | * |
949 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
950 | * risk of ack storms towards the sender | |
f9aa358a | 951 | */ |
52666986 | 952 | int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 953 | { |
52666986 JPM |
954 | if (!l) |
955 | return 0; | |
956 | ||
957 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
958 | if (link_is_bc_rcvlink(l)) { | |
959 | if (((l->rcv_nxt ^ link_own_addr(l)) & 0xf) != 0xf) | |
960 | return 0; | |
961 | l->rcv_unacked = 0; | |
962 | return TIPC_LINK_SND_BC_ACK; | |
963 | } | |
964 | ||
965 | /* Unicast ACK */ | |
f9aa358a JPM |
966 | l->rcv_unacked = 0; |
967 | l->stats.sent_acks++; | |
968 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
52666986 | 969 | return 0; |
f9aa358a JPM |
970 | } |
971 | ||
282b3a05 JPM |
972 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
973 | */ | |
974 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
975 | { | |
976 | int mtyp = RESET_MSG; | |
977 | ||
978 | if (l->state == LINK_ESTABLISHING) | |
979 | mtyp = ACTIVATE_MSG; | |
980 | ||
981 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq); | |
982 | } | |
983 | ||
f9aa358a JPM |
984 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
985 | */ | |
986 | static void tipc_link_build_nack_msg(struct tipc_link *l, | |
987 | struct sk_buff_head *xmitq) | |
988 | { | |
989 | u32 def_cnt = ++l->stats.deferred_recv; | |
990 | ||
52666986 JPM |
991 | if (link_is_bc_rcvlink(l)) |
992 | return; | |
993 | ||
f9aa358a JPM |
994 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) |
995 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
996 | } | |
997 | ||
d999297c | 998 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 999 | * @l: the link that should handle the message |
d999297c JPM |
1000 | * @skb: TIPC packet |
1001 | * @xmitq: queue to place packets to be sent after this call | |
1002 | */ | |
1003 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1004 | struct sk_buff_head *xmitq) | |
1005 | { | |
f9aa358a | 1006 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1007 | struct tipc_msg *hdr; |
81204c49 | 1008 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1009 | int rc = 0; |
1010 | ||
f9aa358a | 1011 | do { |
d999297c | 1012 | hdr = buf_msg(skb); |
f9aa358a JPM |
1013 | seqno = msg_seqno(hdr); |
1014 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1015 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1016 | |
1017 | /* Verify and update link state */ | |
f9aa358a JPM |
1018 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1019 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1020 | |
662921cd | 1021 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1022 | if (l->state == LINK_ESTABLISHING) |
1023 | rc = TIPC_LINK_UP_EVT; | |
1024 | goto drop; | |
d999297c JPM |
1025 | } |
1026 | ||
f9aa358a | 1027 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1028 | l->silent_intv_cnt = 0; |
1029 | ||
81204c49 JPM |
1030 | /* Drop if outside receive window */ |
1031 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1032 | l->stats.duplicates++; | |
1033 | goto drop; | |
1034 | } | |
1035 | ||
d999297c JPM |
1036 | /* Forward queues and wake up waiting users */ |
1037 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1038 | tipc_link_advance_backlog(l, xmitq); | |
1039 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1040 | link_prepare_wakeup(l); | |
1041 | } | |
1042 | ||
81204c49 JPM |
1043 | /* Defer delivery if sequence gap */ |
1044 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1045 | __tipc_skb_queue_sorted(defq, seqno, skb); |
f9aa358a JPM |
1046 | tipc_link_build_nack_msg(l, xmitq); |
1047 | break; | |
d999297c JPM |
1048 | } |
1049 | ||
81204c49 | 1050 | /* Deliver packet */ |
d999297c JPM |
1051 | l->rcv_nxt++; |
1052 | l->stats.recv_info++; | |
f9aa358a | 1053 | if (!tipc_data_input(l, skb, l->inputq)) |
52666986 | 1054 | rc |= tipc_link_input(l, skb, l->inputq); |
f9aa358a | 1055 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
52666986 JPM |
1056 | rc |= tipc_link_build_ack_msg(l, xmitq); |
1057 | if (unlikely(rc & ~TIPC_LINK_SND_BC_ACK)) | |
1058 | break; | |
f9aa358a JPM |
1059 | } while ((skb = __skb_dequeue(defq))); |
1060 | ||
1061 | return rc; | |
1062 | drop: | |
1063 | kfree_skb(skb); | |
d999297c JPM |
1064 | return rc; |
1065 | } | |
1066 | ||
b97bf3fd PL |
1067 | /* |
1068 | * Send protocol message to the other endpoint. | |
1069 | */ | |
426cc2b8 | 1070 | void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg, |
ed193ece | 1071 | u32 gap, u32 tolerance, u32 priority) |
b97bf3fd | 1072 | { |
426cc2b8 JPM |
1073 | struct sk_buff *skb = NULL; |
1074 | struct sk_buff_head xmitq; | |
b97bf3fd | 1075 | |
426cc2b8 JPM |
1076 | __skb_queue_head_init(&xmitq); |
1077 | tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap, | |
1078 | tolerance, priority, &xmitq); | |
1079 | skb = __skb_dequeue(&xmitq); | |
1080 | if (!skb) | |
b97bf3fd | 1081 | return; |
c72fa872 | 1082 | tipc_bearer_xmit_skb(l->net, l->bearer_id, skb, l->media_addr); |
426cc2b8 | 1083 | l->rcv_unacked = 0; |
b97bf3fd PL |
1084 | } |
1085 | ||
426cc2b8 JPM |
1086 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
1087 | u16 rcvgap, int tolerance, int priority, | |
1088 | struct sk_buff_head *xmitq) | |
1089 | { | |
1090 | struct sk_buff *skb = NULL; | |
1091 | struct tipc_msg *hdr = l->pmsg; | |
52666986 | 1092 | bool node_up = link_is_up(l->bc_rcvlink); |
426cc2b8 JPM |
1093 | |
1094 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1095 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1096 | return; |
1097 | ||
426cc2b8 JPM |
1098 | msg_set_type(hdr, mtyp); |
1099 | msg_set_net_plane(hdr, l->net_plane); | |
52666986 JPM |
1100 | msg_set_next_sent(hdr, l->snd_nxt); |
1101 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
1102 | msg_set_bcast_ack(hdr, l->bc_rcvlink->rcv_nxt - 1); | |
1103 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
426cc2b8 JPM |
1104 | msg_set_link_tolerance(hdr, tolerance); |
1105 | msg_set_linkprio(hdr, priority); | |
1106 | msg_set_redundant_link(hdr, node_up); | |
1107 | msg_set_seq_gap(hdr, 0); | |
1108 | ||
1109 | /* Compatibility: created msg must not be in sequence with pkt flow */ | |
52666986 | 1110 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1111 | |
1112 | if (mtyp == STATE_MSG) { | |
1113 | if (!tipc_link_is_up(l)) | |
1114 | return; | |
426cc2b8 JPM |
1115 | |
1116 | /* Override rcvgap if there are packets in deferred queue */ | |
1117 | if (!skb_queue_empty(&l->deferdq)) | |
52666986 | 1118 | rcvgap = buf_seqno(skb_peek(&l->deferdq)) - l->rcv_nxt; |
426cc2b8 JPM |
1119 | if (rcvgap) { |
1120 | msg_set_seq_gap(hdr, rcvgap); | |
1121 | l->stats.sent_nacks++; | |
1122 | } | |
426cc2b8 JPM |
1123 | msg_set_probe(hdr, probe); |
1124 | if (probe) | |
1125 | l->stats.sent_probes++; | |
1126 | l->stats.sent_states++; | |
52666986 | 1127 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1128 | } else { |
1129 | /* RESET_MSG or ACTIVATE_MSG */ | |
1130 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
6e498158 | 1131 | msg_set_ack(hdr, l->rcv_nxt - 1); |
426cc2b8 JPM |
1132 | msg_set_next_sent(hdr, 1); |
1133 | } | |
1134 | skb = tipc_buf_acquire(msg_size(hdr)); | |
1135 | if (!skb) | |
1136 | return; | |
1137 | skb_copy_to_linear_data(skb, hdr, msg_size(hdr)); | |
1138 | skb->priority = TC_PRIO_CONTROL; | |
6e498158 | 1139 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1140 | } |
1141 | ||
6e498158 | 1142 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1143 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1144 | */ |
6e498158 JPM |
1145 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1146 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1147 | { |
6e498158 JPM |
1148 | struct sk_buff *skb, *tnlskb; |
1149 | struct tipc_msg *hdr, tnlhdr; | |
1150 | struct sk_buff_head *queue = &l->transmq; | |
1151 | struct sk_buff_head tmpxq, tnlq; | |
1152 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1153 | |
6e498158 | 1154 | if (!tnl) |
b97bf3fd PL |
1155 | return; |
1156 | ||
6e498158 JPM |
1157 | skb_queue_head_init(&tnlq); |
1158 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1159 | |
6e498158 JPM |
1160 | /* At least one packet required for safe algorithm => add dummy */ |
1161 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1162 | BASIC_H_SIZE, 0, l->addr, link_own_addr(l), | |
1163 | 0, 0, TIPC_ERR_NO_PORT); | |
1164 | if (!skb) { | |
1165 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1166 | return; |
1167 | } | |
6e498158 JPM |
1168 | skb_queue_tail(&tnlq, skb); |
1169 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1170 | __skb_queue_purge(&tmpxq); | |
1171 | ||
1172 | /* Initialize reusable tunnel packet header */ | |
1173 | tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL, | |
1174 | mtyp, INT_H_SIZE, l->addr); | |
1175 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1176 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1177 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1178 | tnl: | |
1179 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1180 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1181 | hdr = buf_msg(skb); |
1182 | if (queue == &l->backlogq) | |
1183 | msg_set_seqno(hdr, seqno++); | |
1184 | pktlen = msg_size(hdr); | |
1185 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
1186 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE); | |
1187 | if (!tnlskb) { | |
1188 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1189 | return; |
1190 | } | |
6e498158 JPM |
1191 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1192 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1193 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1194 | } |
6e498158 JPM |
1195 | if (queue != &l->backlogq) { |
1196 | queue = &l->backlogq; | |
1197 | goto tnl; | |
f006c9c7 | 1198 | } |
1dab3d5a | 1199 | |
6e498158 | 1200 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1201 | |
6e498158 JPM |
1202 | if (mtyp == FAILOVER_MSG) { |
1203 | tnl->drop_point = l->rcv_nxt; | |
1204 | tnl->failover_reasm_skb = l->reasm_buf; | |
1205 | l->reasm_buf = NULL; | |
2da71425 | 1206 | } |
b97bf3fd PL |
1207 | } |
1208 | ||
d999297c JPM |
1209 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1210 | * Note that network plane id propagates through the network, and may | |
1211 | * change at any time. The node with lowest numerical id determines | |
1212 | * network plane | |
1213 | */ | |
1214 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1215 | struct sk_buff_head *xmitq) | |
1216 | { | |
1217 | struct tipc_msg *hdr = buf_msg(skb); | |
1218 | u16 rcvgap = 0; | |
c1ab3f1d JPM |
1219 | u16 ack = msg_ack(hdr); |
1220 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1221 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1222 | u16 peers_tol = msg_link_tolerance(hdr); | |
1223 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1224 | u16 rcv_nxt = l->rcv_nxt; |
73f646ce | 1225 | int mtyp = msg_type(hdr); |
d999297c JPM |
1226 | char *if_name; |
1227 | int rc = 0; | |
1228 | ||
52666986 | 1229 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
1230 | goto exit; |
1231 | ||
1232 | if (link_own_addr(l) > msg_prevnode(hdr)) | |
1233 | l->net_plane = msg_net_plane(hdr); | |
1234 | ||
73f646ce | 1235 | switch (mtyp) { |
d999297c JPM |
1236 | case RESET_MSG: |
1237 | ||
1238 | /* Ignore duplicate RESET with old session number */ | |
1239 | if ((less_eq(msg_session(hdr), l->peer_session)) && | |
1240 | (l->peer_session != WILDCARD_SESSION)) | |
1241 | break; | |
1242 | /* fall thru' */ | |
662921cd | 1243 | |
d999297c | 1244 | case ACTIVATE_MSG: |
c7cad0d6 JPM |
1245 | skb_linearize(skb); |
1246 | hdr = buf_msg(skb); | |
d999297c JPM |
1247 | |
1248 | /* Complete own link name with peer's interface name */ | |
1249 | if_name = strrchr(l->name, ':') + 1; | |
1250 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1251 | break; | |
1252 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1253 | break; | |
1254 | strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME); | |
1255 | ||
1256 | /* Update own tolerance if peer indicates a non-zero value */ | |
1257 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1258 | l->tolerance = peers_tol; | |
1259 | ||
1260 | /* Update own priority if peer's priority is higher */ | |
1261 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1262 | l->priority = peers_prio; | |
1263 | ||
73f646ce JPM |
1264 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
1265 | if ((mtyp == RESET_MSG) || !link_is_up(l)) | |
1266 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); | |
1267 | ||
1268 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
1269 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) | |
1270 | rc = TIPC_LINK_UP_EVT; | |
1271 | ||
d999297c JPM |
1272 | l->peer_session = msg_session(hdr); |
1273 | l->peer_bearer_id = msg_bearer_id(hdr); | |
d999297c JPM |
1274 | if (l->mtu > msg_max_pkt(hdr)) |
1275 | l->mtu = msg_max_pkt(hdr); | |
1276 | break; | |
662921cd | 1277 | |
d999297c | 1278 | case STATE_MSG: |
662921cd | 1279 | |
d999297c JPM |
1280 | /* Update own tolerance if peer indicates a non-zero value */ |
1281 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1282 | l->tolerance = peers_tol; | |
1283 | ||
1284 | l->silent_intv_cnt = 0; | |
1285 | l->stats.recv_states++; | |
1286 | if (msg_probe(hdr)) | |
1287 | l->stats.recv_probes++; | |
73f646ce JPM |
1288 | |
1289 | if (!link_is_up(l)) { | |
1290 | if (l->state == LINK_ESTABLISHING) | |
1291 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1292 | break; |
73f646ce | 1293 | } |
d999297c | 1294 | |
662921cd | 1295 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1296 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c JPM |
1297 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
1298 | if (rcvgap || (msg_probe(hdr))) | |
1299 | tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap, | |
16040894 | 1300 | 0, 0, xmitq); |
c1ab3f1d | 1301 | tipc_link_release_pkts(l, ack); |
d999297c JPM |
1302 | |
1303 | /* If NACK, retransmit will now start at right position */ | |
c1ab3f1d JPM |
1304 | if (gap) { |
1305 | rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq); | |
d999297c JPM |
1306 | l->stats.recv_nacks++; |
1307 | } | |
662921cd | 1308 | |
d999297c JPM |
1309 | tipc_link_advance_backlog(l, xmitq); |
1310 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1311 | link_prepare_wakeup(l); | |
1312 | } | |
1313 | exit: | |
1314 | kfree_skb(skb); | |
1315 | return rc; | |
1316 | } | |
1317 | ||
52666986 JPM |
1318 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
1319 | */ | |
1320 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
1321 | u16 peers_snd_nxt, | |
1322 | struct sk_buff_head *xmitq) | |
1323 | { | |
1324 | struct sk_buff *skb; | |
1325 | struct tipc_msg *hdr; | |
1326 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
1327 | u16 ack = l->rcv_nxt - 1; | |
1328 | u16 gap_to = peers_snd_nxt - 1; | |
1329 | ||
1330 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
1331 | 0, l->addr, link_own_addr(l), 0, 0, 0); | |
1332 | if (!skb) | |
1333 | return false; | |
1334 | hdr = buf_msg(skb); | |
1335 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
1336 | msg_set_bcast_ack(hdr, ack); | |
1337 | msg_set_bcgap_after(hdr, ack); | |
1338 | if (dfrd_skb) | |
1339 | gap_to = buf_seqno(dfrd_skb) - 1; | |
1340 | msg_set_bcgap_to(hdr, gap_to); | |
1341 | msg_set_non_seq(hdr, bcast); | |
1342 | __skb_queue_tail(xmitq, skb); | |
1343 | return true; | |
1344 | } | |
1345 | ||
1346 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
1347 | * | |
1348 | * Give a newly added peer node the sequence number where it should | |
1349 | * start receiving and acking broadcast packets. | |
1350 | */ | |
742e0383 WF |
1351 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
1352 | struct sk_buff_head *xmitq) | |
52666986 JPM |
1353 | { |
1354 | struct sk_buff_head list; | |
1355 | ||
1356 | __skb_queue_head_init(&list); | |
1357 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
1358 | return; | |
1359 | tipc_link_xmit(l, &list, xmitq); | |
1360 | } | |
1361 | ||
1362 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
1363 | */ | |
1364 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
1365 | { | |
1366 | int mtyp = msg_type(hdr); | |
1367 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1368 | ||
1369 | if (link_is_up(l)) | |
1370 | return; | |
1371 | ||
1372 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
1373 | l->rcv_nxt = peers_snd_nxt; | |
1374 | l->state = LINK_ESTABLISHED; | |
1375 | return; | |
1376 | } | |
1377 | ||
1378 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
1379 | return; | |
1380 | ||
1381 | if (msg_peer_node_is_up(hdr)) | |
1382 | return; | |
1383 | ||
1384 | /* Compatibility: accept older, less safe initial synch data */ | |
1385 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
1386 | l->rcv_nxt = peers_snd_nxt; | |
1387 | } | |
1388 | ||
1389 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state | |
1390 | */ | |
1391 | void tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, | |
1392 | struct sk_buff_head *xmitq) | |
1393 | { | |
1394 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1395 | ||
1396 | if (!link_is_up(l)) | |
1397 | return; | |
1398 | ||
1399 | if (!msg_peer_node_is_up(hdr)) | |
1400 | return; | |
1401 | ||
1402 | l->bc_peer_is_up = true; | |
1403 | ||
1404 | /* Ignore if peers_snd_nxt goes beyond receive window */ | |
1405 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
1406 | return; | |
1407 | ||
1408 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
1409 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
1410 | return; | |
1411 | } | |
1412 | ||
1413 | /* Don't NACK if one was recently sent or peeked */ | |
1414 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
1415 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1416 | return; | |
1417 | } | |
1418 | ||
1419 | /* Conditionally delay NACK sending until next synch rcv */ | |
1420 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
1421 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1422 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
1423 | return; | |
1424 | } | |
1425 | ||
1426 | /* Send NACK now but suppress next one */ | |
1427 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
1428 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1429 | } | |
1430 | ||
1431 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, | |
1432 | struct sk_buff_head *xmitq) | |
1433 | { | |
1434 | struct sk_buff *skb, *tmp; | |
1435 | struct tipc_link *snd_l = l->bc_sndlink; | |
1436 | ||
1437 | if (!link_is_up(l) || !l->bc_peer_is_up) | |
1438 | return; | |
1439 | ||
1440 | if (!more(acked, l->acked)) | |
1441 | return; | |
1442 | ||
1443 | /* Skip over packets peer has already acked */ | |
1444 | skb_queue_walk(&snd_l->transmq, skb) { | |
1445 | if (more(buf_seqno(skb), l->acked)) | |
1446 | break; | |
1447 | } | |
1448 | ||
1449 | /* Update/release the packets peer is acking now */ | |
1450 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { | |
1451 | if (more(buf_seqno(skb), acked)) | |
1452 | break; | |
1453 | if (!--TIPC_SKB_CB(skb)->ackers) { | |
1454 | __skb_unlink(skb, &snd_l->transmq); | |
1455 | kfree_skb(skb); | |
1456 | } | |
1457 | } | |
1458 | l->acked = acked; | |
1459 | tipc_link_advance_backlog(snd_l, xmitq); | |
1460 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) | |
1461 | link_prepare_wakeup(snd_l); | |
1462 | } | |
1463 | ||
1464 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
1465 | */ | |
1466 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1467 | struct sk_buff_head *xmitq) | |
1468 | { | |
1469 | struct tipc_msg *hdr = buf_msg(skb); | |
1470 | u32 dnode = msg_destnode(hdr); | |
1471 | int mtyp = msg_type(hdr); | |
1472 | u16 acked = msg_bcast_ack(hdr); | |
1473 | u16 from = acked + 1; | |
1474 | u16 to = msg_bcgap_to(hdr); | |
1475 | u16 peers_snd_nxt = to + 1; | |
1476 | int rc = 0; | |
1477 | ||
1478 | kfree_skb(skb); | |
1479 | ||
1480 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
1481 | return 0; | |
1482 | ||
1483 | if (mtyp != STATE_MSG) | |
1484 | return 0; | |
1485 | ||
1486 | if (dnode == link_own_addr(l)) { | |
1487 | tipc_link_bc_ack_rcv(l, acked, xmitq); | |
1488 | rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq); | |
1489 | l->stats.recv_nacks++; | |
1490 | return rc; | |
1491 | } | |
1492 | ||
1493 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
1494 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
1495 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1496 | ||
1497 | return 0; | |
1498 | } | |
1499 | ||
e3eea1eb | 1500 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1501 | { |
ed193ece | 1502 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1503 | |
1504 | l->window = win; | |
1f66d161 JPM |
1505 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1506 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1507 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1508 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1509 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1510 | } |
1511 | ||
b97bf3fd PL |
1512 | /** |
1513 | * link_reset_statistics - reset link statistics | |
1514 | * @l_ptr: pointer to link | |
1515 | */ | |
5be9c086 | 1516 | void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1517 | { |
1518 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
a97b9d3f JPM |
1519 | l_ptr->stats.sent_info = l_ptr->snd_nxt; |
1520 | l_ptr->stats.recv_info = l_ptr->rcv_nxt; | |
b97bf3fd PL |
1521 | } |
1522 | ||
1a20cc25 | 1523 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1524 | { |
1a20cc25 | 1525 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 1526 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 1527 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 1528 | |
662921cd | 1529 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1530 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1531 | skb_queue_len(&l->transmq), head, tail, | |
1532 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1533 | } |
0655f6a8 RA |
1534 | |
1535 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1536 | */ | |
1537 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1538 | { | |
1539 | int err; | |
1540 | ||
1541 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1542 | tipc_nl_prop_policy); | |
1543 | if (err) | |
1544 | return err; | |
1545 | ||
1546 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1547 | u32 prio; | |
1548 | ||
1549 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1550 | if (prio > TIPC_MAX_LINK_PRI) | |
1551 | return -EINVAL; | |
1552 | } | |
1553 | ||
1554 | if (props[TIPC_NLA_PROP_TOL]) { | |
1555 | u32 tol; | |
1556 | ||
1557 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1558 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1559 | return -EINVAL; | |
1560 | } | |
1561 | ||
1562 | if (props[TIPC_NLA_PROP_WIN]) { | |
1563 | u32 win; | |
1564 | ||
1565 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1566 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1567 | return -EINVAL; | |
1568 | } | |
1569 | ||
1570 | return 0; | |
1571 | } | |
7be57fc6 | 1572 | |
d8182804 | 1573 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
1574 | { |
1575 | int i; | |
1576 | struct nlattr *stats; | |
1577 | ||
1578 | struct nla_map { | |
1579 | u32 key; | |
1580 | u32 val; | |
1581 | }; | |
1582 | ||
1583 | struct nla_map map[] = { | |
1584 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1585 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1586 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1587 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1588 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
1589 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
1590 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
1591 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1592 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1593 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1594 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1595 | s->msg_length_counts : 1}, | |
1596 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1597 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1598 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1599 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1600 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1601 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1602 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1603 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1604 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1605 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1606 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1607 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1608 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1609 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1610 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1611 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1612 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1613 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1614 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1615 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1616 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1617 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1618 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1619 | }; | |
1620 | ||
1621 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1622 | if (!stats) | |
1623 | return -EMSGSIZE; | |
1624 | ||
1625 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1626 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1627 | goto msg_full; | |
1628 | ||
1629 | nla_nest_end(skb, stats); | |
1630 | ||
1631 | return 0; | |
1632 | msg_full: | |
1633 | nla_nest_cancel(skb, stats); | |
1634 | ||
1635 | return -EMSGSIZE; | |
1636 | } | |
1637 | ||
1638 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
1639 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
1640 | struct tipc_link *link, int nlflags) | |
7be57fc6 RA |
1641 | { |
1642 | int err; | |
1643 | void *hdr; | |
1644 | struct nlattr *attrs; | |
1645 | struct nlattr *prop; | |
34747539 | 1646 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 1647 | |
bfb3e5dd | 1648 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1649 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1650 | if (!hdr) |
1651 | return -EMSGSIZE; | |
1652 | ||
1653 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1654 | if (!attrs) | |
1655 | goto msg_full; | |
1656 | ||
1657 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
1658 | goto attr_msg_full; | |
1659 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 1660 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 1661 | goto attr_msg_full; |
ed193ece | 1662 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 1663 | goto attr_msg_full; |
a97b9d3f | 1664 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
7be57fc6 | 1665 | goto attr_msg_full; |
a97b9d3f | 1666 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
7be57fc6 RA |
1667 | goto attr_msg_full; |
1668 | ||
1669 | if (tipc_link_is_up(link)) | |
1670 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1671 | goto attr_msg_full; | |
c72fa872 | 1672 | if (link->active) |
7be57fc6 RA |
1673 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
1674 | goto attr_msg_full; | |
1675 | ||
1676 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1677 | if (!prop) | |
1678 | goto attr_msg_full; | |
1679 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1680 | goto prop_msg_full; | |
1681 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
1682 | goto prop_msg_full; | |
1683 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 1684 | link->window)) |
7be57fc6 RA |
1685 | goto prop_msg_full; |
1686 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1687 | goto prop_msg_full; | |
1688 | nla_nest_end(msg->skb, prop); | |
1689 | ||
1690 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
1691 | if (err) | |
1692 | goto attr_msg_full; | |
1693 | ||
1694 | nla_nest_end(msg->skb, attrs); | |
1695 | genlmsg_end(msg->skb, hdr); | |
1696 | ||
1697 | return 0; | |
1698 | ||
1699 | prop_msg_full: | |
1700 | nla_nest_cancel(msg->skb, prop); | |
1701 | attr_msg_full: | |
1702 | nla_nest_cancel(msg->skb, attrs); | |
1703 | msg_full: | |
1704 | genlmsg_cancel(msg->skb, hdr); | |
1705 | ||
1706 | return -EMSGSIZE; | |
1707 | } |