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 "; |
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 | ||
52666986 JPM |
79 | /* Send states for broadcast NACKs |
80 | */ | |
81 | enum { | |
82 | BC_NACK_SND_CONDITIONAL, | |
83 | BC_NACK_SND_UNCONDITIONAL, | |
84 | BC_NACK_SND_SUPPRESS, | |
85 | }; | |
86 | ||
d999297c JPM |
87 | /* |
88 | * Interval between NACKs when packets arrive out of order | |
89 | */ | |
90 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
a686e685 AS |
91 | /* |
92 | * Out-of-range value for link session numbers | |
93 | */ | |
d3504c34 | 94 | #define WILDCARD_SESSION 0x10000 |
a686e685 | 95 | |
662921cd | 96 | /* Link FSM states: |
b97bf3fd | 97 | */ |
d3504c34 | 98 | enum { |
662921cd JPM |
99 | LINK_ESTABLISHED = 0xe, |
100 | LINK_ESTABLISHING = 0xe << 4, | |
101 | LINK_RESET = 0x1 << 8, | |
102 | LINK_RESETTING = 0x2 << 12, | |
103 | LINK_PEER_RESET = 0xd << 16, | |
104 | LINK_FAILINGOVER = 0xf << 20, | |
105 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
106 | }; |
107 | ||
108 | /* Link FSM state checking routines | |
109 | */ | |
662921cd | 110 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 111 | { |
662921cd | 112 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 113 | } |
b97bf3fd | 114 | |
d999297c JPM |
115 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
116 | struct sk_buff_head *xmitq); | |
426cc2b8 JPM |
117 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
118 | u16 rcvgap, int tolerance, int priority, | |
119 | struct sk_buff_head *xmitq); | |
a18c4bc3 PG |
120 | static void link_reset_statistics(struct tipc_link *l_ptr); |
121 | static void link_print(struct tipc_link *l_ptr, const char *str); | |
52666986 JPM |
122 | static void tipc_link_build_nack_msg(struct tipc_link *l, |
123 | struct sk_buff_head *xmitq); | |
124 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, | |
125 | struct sk_buff_head *xmitq); | |
126 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); | |
8b4ed863 | 127 | |
b97bf3fd | 128 | /* |
05790c64 | 129 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 130 | */ |
662921cd | 131 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 132 | { |
662921cd JPM |
133 | return link_is_up(l); |
134 | } | |
135 | ||
c8199300 JPM |
136 | bool tipc_link_peer_is_down(struct tipc_link *l) |
137 | { | |
138 | return l->state == LINK_PEER_RESET; | |
139 | } | |
140 | ||
662921cd JPM |
141 | bool tipc_link_is_reset(struct tipc_link *l) |
142 | { | |
143 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
144 | } | |
145 | ||
73f646ce JPM |
146 | bool tipc_link_is_establishing(struct tipc_link *l) |
147 | { | |
148 | return l->state == LINK_ESTABLISHING; | |
149 | } | |
150 | ||
662921cd JPM |
151 | bool tipc_link_is_synching(struct tipc_link *l) |
152 | { | |
153 | return l->state == LINK_SYNCHING; | |
154 | } | |
155 | ||
156 | bool tipc_link_is_failingover(struct tipc_link *l) | |
157 | { | |
158 | return l->state == LINK_FAILINGOVER; | |
159 | } | |
160 | ||
161 | bool tipc_link_is_blocked(struct tipc_link *l) | |
162 | { | |
163 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
164 | } |
165 | ||
742e0383 | 166 | static bool link_is_bc_sndlink(struct tipc_link *l) |
52666986 JPM |
167 | { |
168 | return !l->bc_sndlink; | |
169 | } | |
170 | ||
742e0383 | 171 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
52666986 JPM |
172 | { |
173 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); | |
174 | } | |
175 | ||
9d13ec65 | 176 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 177 | { |
c72fa872 JPM |
178 | return l->active; |
179 | } | |
9d13ec65 | 180 | |
c72fa872 JPM |
181 | void tipc_link_set_active(struct tipc_link *l, bool active) |
182 | { | |
183 | l->active = active; | |
b97bf3fd PL |
184 | } |
185 | ||
52666986 JPM |
186 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
187 | struct tipc_link *uc_l, | |
188 | struct sk_buff_head *xmitq) | |
2f566124 | 189 | { |
52666986 JPM |
190 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
191 | ||
192 | snd_l->ackers++; | |
193 | rcv_l->acked = snd_l->snd_nxt - 1; | |
9a650838 | 194 | snd_l->state = LINK_ESTABLISHED; |
52666986 | 195 | tipc_link_build_bc_init_msg(uc_l, xmitq); |
2f566124 JPM |
196 | } |
197 | ||
52666986 JPM |
198 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
199 | struct tipc_link *rcv_l, | |
200 | struct sk_buff_head *xmitq) | |
2f566124 | 201 | { |
52666986 JPM |
202 | u16 ack = snd_l->snd_nxt - 1; |
203 | ||
204 | snd_l->ackers--; | |
205 | tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); | |
206 | tipc_link_reset(rcv_l); | |
207 | rcv_l->state = LINK_RESET; | |
208 | if (!snd_l->ackers) { | |
209 | tipc_link_reset(snd_l); | |
9a650838 | 210 | snd_l->state = LINK_RESET; |
52666986 JPM |
211 | __skb_queue_purge(xmitq); |
212 | } | |
2f566124 JPM |
213 | } |
214 | ||
215 | int tipc_link_bc_peers(struct tipc_link *l) | |
216 | { | |
217 | return l->ackers; | |
218 | } | |
219 | ||
959e1781 JPM |
220 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
221 | { | |
222 | l->mtu = mtu; | |
223 | } | |
224 | ||
225 | int tipc_link_mtu(struct tipc_link *l) | |
226 | { | |
227 | return l->mtu; | |
228 | } | |
229 | ||
440d8963 JPM |
230 | static u32 link_own_addr(struct tipc_link *l) |
231 | { | |
232 | return msg_prevnode(l->pmsg); | |
233 | } | |
234 | ||
b97bf3fd | 235 | /** |
4323add6 | 236 | * tipc_link_create - create a new link |
440d8963 | 237 | * @n: pointer to associated node |
0e05498e JPM |
238 | * @if_name: associated interface name |
239 | * @bearer_id: id (index) of associated bearer | |
240 | * @tolerance: link tolerance to be used by link | |
241 | * @net_plane: network plane (A,B,c..) this link belongs to | |
242 | * @mtu: mtu to be advertised by link | |
243 | * @priority: priority to be used by link | |
244 | * @window: send window to be used by link | |
245 | * @session: session to be used by link | |
440d8963 | 246 | * @ownnode: identity of own node |
0e05498e | 247 | * @peer: node id of peer node |
fd556f20 | 248 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
249 | * @bc_sndlink: the namespace global link used for broadcast sending |
250 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
251 | * @inputq: queue to put messages ready for delivery |
252 | * @namedq: queue to put binding table update messages ready for delivery | |
253 | * @link: return value, pointer to put the created link | |
c4307285 | 254 | * |
440d8963 | 255 | * Returns true if link was created, otherwise false |
b97bf3fd | 256 | */ |
c72fa872 | 257 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e JPM |
258 | int tolerance, char net_plane, u32 mtu, int priority, |
259 | int window, u32 session, u32 ownnode, u32 peer, | |
52666986 | 260 | u16 peer_caps, |
52666986 JPM |
261 | struct tipc_link *bc_sndlink, |
262 | struct tipc_link *bc_rcvlink, | |
263 | struct sk_buff_head *inputq, | |
264 | struct sk_buff_head *namedq, | |
440d8963 | 265 | struct tipc_link **link) |
b97bf3fd | 266 | { |
440d8963 JPM |
267 | struct tipc_link *l; |
268 | struct tipc_msg *hdr; | |
37b9c08a | 269 | |
440d8963 JPM |
270 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
271 | if (!l) | |
272 | return false; | |
273 | *link = l; | |
0e05498e JPM |
274 | l->pmsg = (struct tipc_msg *)&l->proto_msg; |
275 | hdr = l->pmsg; | |
276 | tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer); | |
277 | msg_set_size(hdr, sizeof(l->proto_msg)); | |
278 | msg_set_session(hdr, session); | |
279 | msg_set_bearer_id(hdr, l->bearer_id); | |
37b9c08a | 280 | |
440d8963 | 281 | /* Note: peer i/f name is completed by reset/activate message */ |
440d8963 JPM |
282 | sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
283 | tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode), | |
284 | if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
0e05498e | 285 | strcpy((char *)msg_data(hdr), if_name); |
b97bf3fd | 286 | |
440d8963 | 287 | l->addr = peer; |
fd556f20 | 288 | l->peer_caps = peer_caps; |
c72fa872 | 289 | l->net = net; |
440d8963 | 290 | l->peer_session = WILDCARD_SESSION; |
0e05498e JPM |
291 | l->bearer_id = bearer_id; |
292 | l->tolerance = tolerance; | |
293 | l->net_plane = net_plane; | |
294 | l->advertised_mtu = mtu; | |
295 | l->mtu = mtu; | |
296 | l->priority = priority; | |
297 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 298 | l->ackers = 1; |
52666986 JPM |
299 | l->bc_sndlink = bc_sndlink; |
300 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
301 | l->inputq = inputq; |
302 | l->namedq = namedq; | |
303 | l->state = LINK_RESETTING; | |
440d8963 JPM |
304 | __skb_queue_head_init(&l->transmq); |
305 | __skb_queue_head_init(&l->backlogq); | |
306 | __skb_queue_head_init(&l->deferdq); | |
307 | skb_queue_head_init(&l->wakeupq); | |
308 | skb_queue_head_init(l->inputq); | |
309 | return true; | |
b97bf3fd PL |
310 | } |
311 | ||
32301906 JPM |
312 | /** |
313 | * tipc_link_bc_create - create new link to be used for broadcast | |
314 | * @n: pointer to associated node | |
315 | * @mtu: mtu to be used | |
316 | * @window: send window to be used | |
317 | * @inputq: queue to put messages ready for delivery | |
318 | * @namedq: queue to put binding table update messages ready for delivery | |
319 | * @link: return value, pointer to put the created link | |
320 | * | |
321 | * Returns true if link was created, otherwise false | |
322 | */ | |
c72fa872 | 323 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
52666986 | 324 | int mtu, int window, u16 peer_caps, |
32301906 JPM |
325 | struct sk_buff_head *inputq, |
326 | struct sk_buff_head *namedq, | |
52666986 | 327 | struct tipc_link *bc_sndlink, |
32301906 JPM |
328 | struct tipc_link **link) |
329 | { | |
330 | struct tipc_link *l; | |
331 | ||
c72fa872 | 332 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
2af5ae37 | 333 | 0, ownnode, peer, peer_caps, bc_sndlink, |
52666986 | 334 | NULL, inputq, namedq, link)) |
32301906 JPM |
335 | return false; |
336 | ||
337 | l = *link; | |
338 | strcpy(l->name, tipc_bclink_name); | |
339 | tipc_link_reset(l); | |
52666986 | 340 | l->state = LINK_RESET; |
2f566124 | 341 | l->ackers = 0; |
52666986 | 342 | l->bc_rcvlink = l; |
32301906 | 343 | |
52666986 JPM |
344 | /* Broadcast send link is always up */ |
345 | if (link_is_bc_sndlink(l)) | |
346 | l->state = LINK_ESTABLISHED; | |
d999297c | 347 | |
52666986 | 348 | return true; |
d999297c JPM |
349 | } |
350 | ||
6ab30f9c JPM |
351 | /** |
352 | * tipc_link_fsm_evt - link finite state machine | |
353 | * @l: pointer to link | |
354 | * @evt: state machine event to be processed | |
6ab30f9c | 355 | */ |
662921cd | 356 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 357 | { |
5045f7b9 | 358 | int rc = 0; |
6ab30f9c JPM |
359 | |
360 | switch (l->state) { | |
662921cd | 361 | case LINK_RESETTING: |
6ab30f9c | 362 | switch (evt) { |
662921cd JPM |
363 | case LINK_PEER_RESET_EVT: |
364 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 365 | break; |
662921cd JPM |
366 | case LINK_RESET_EVT: |
367 | l->state = LINK_RESET; | |
368 | break; | |
369 | case LINK_FAILURE_EVT: | |
370 | case LINK_FAILOVER_BEGIN_EVT: | |
371 | case LINK_ESTABLISH_EVT: | |
372 | case LINK_FAILOVER_END_EVT: | |
373 | case LINK_SYNCH_BEGIN_EVT: | |
374 | case LINK_SYNCH_END_EVT: | |
375 | default: | |
376 | goto illegal_evt; | |
377 | } | |
378 | break; | |
379 | case LINK_RESET: | |
380 | switch (evt) { | |
381 | case LINK_PEER_RESET_EVT: | |
382 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 383 | break; |
662921cd JPM |
384 | case LINK_FAILOVER_BEGIN_EVT: |
385 | l->state = LINK_FAILINGOVER; | |
386 | case LINK_FAILURE_EVT: | |
387 | case LINK_RESET_EVT: | |
388 | case LINK_ESTABLISH_EVT: | |
389 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 390 | break; |
662921cd JPM |
391 | case LINK_SYNCH_BEGIN_EVT: |
392 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 393 | default: |
662921cd | 394 | goto illegal_evt; |
6ab30f9c JPM |
395 | } |
396 | break; | |
662921cd | 397 | case LINK_PEER_RESET: |
6ab30f9c | 398 | switch (evt) { |
662921cd JPM |
399 | case LINK_RESET_EVT: |
400 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 401 | break; |
662921cd JPM |
402 | case LINK_PEER_RESET_EVT: |
403 | case LINK_ESTABLISH_EVT: | |
404 | case LINK_FAILURE_EVT: | |
6ab30f9c | 405 | break; |
662921cd JPM |
406 | case LINK_SYNCH_BEGIN_EVT: |
407 | case LINK_SYNCH_END_EVT: | |
408 | case LINK_FAILOVER_BEGIN_EVT: | |
409 | case LINK_FAILOVER_END_EVT: | |
410 | default: | |
411 | goto illegal_evt; | |
412 | } | |
413 | break; | |
414 | case LINK_FAILINGOVER: | |
415 | switch (evt) { | |
416 | case LINK_FAILOVER_END_EVT: | |
417 | l->state = LINK_RESET; | |
6ab30f9c | 418 | break; |
662921cd JPM |
419 | case LINK_PEER_RESET_EVT: |
420 | case LINK_RESET_EVT: | |
421 | case LINK_ESTABLISH_EVT: | |
422 | case LINK_FAILURE_EVT: | |
423 | break; | |
424 | case LINK_FAILOVER_BEGIN_EVT: | |
425 | case LINK_SYNCH_BEGIN_EVT: | |
426 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 427 | default: |
662921cd | 428 | goto illegal_evt; |
6ab30f9c JPM |
429 | } |
430 | break; | |
662921cd | 431 | case LINK_ESTABLISHING: |
6ab30f9c | 432 | switch (evt) { |
662921cd JPM |
433 | case LINK_ESTABLISH_EVT: |
434 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 435 | break; |
662921cd JPM |
436 | case LINK_FAILOVER_BEGIN_EVT: |
437 | l->state = LINK_FAILINGOVER; | |
438 | break; | |
662921cd | 439 | case LINK_RESET_EVT: |
73f646ce JPM |
440 | l->state = LINK_RESET; |
441 | break; | |
662921cd | 442 | case LINK_FAILURE_EVT: |
73f646ce | 443 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
444 | case LINK_SYNCH_BEGIN_EVT: |
445 | case LINK_FAILOVER_END_EVT: | |
446 | break; | |
447 | case LINK_SYNCH_END_EVT: | |
448 | default: | |
449 | goto illegal_evt; | |
450 | } | |
451 | break; | |
452 | case LINK_ESTABLISHED: | |
453 | switch (evt) { | |
454 | case LINK_PEER_RESET_EVT: | |
455 | l->state = LINK_PEER_RESET; | |
456 | rc |= TIPC_LINK_DOWN_EVT; | |
457 | break; | |
458 | case LINK_FAILURE_EVT: | |
459 | l->state = LINK_RESETTING; | |
460 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 461 | break; |
662921cd JPM |
462 | case LINK_RESET_EVT: |
463 | l->state = LINK_RESET; | |
6ab30f9c | 464 | break; |
662921cd | 465 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 466 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 467 | break; |
662921cd JPM |
468 | case LINK_SYNCH_BEGIN_EVT: |
469 | l->state = LINK_SYNCHING; | |
470 | break; | |
662921cd JPM |
471 | case LINK_FAILOVER_BEGIN_EVT: |
472 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 473 | default: |
662921cd | 474 | goto illegal_evt; |
6ab30f9c JPM |
475 | } |
476 | break; | |
662921cd | 477 | case LINK_SYNCHING: |
6ab30f9c | 478 | switch (evt) { |
662921cd JPM |
479 | case LINK_PEER_RESET_EVT: |
480 | l->state = LINK_PEER_RESET; | |
481 | rc |= TIPC_LINK_DOWN_EVT; | |
482 | break; | |
483 | case LINK_FAILURE_EVT: | |
484 | l->state = LINK_RESETTING; | |
485 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 486 | break; |
662921cd JPM |
487 | case LINK_RESET_EVT: |
488 | l->state = LINK_RESET; | |
6ab30f9c | 489 | break; |
662921cd JPM |
490 | case LINK_ESTABLISH_EVT: |
491 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 492 | break; |
662921cd JPM |
493 | case LINK_SYNCH_END_EVT: |
494 | l->state = LINK_ESTABLISHED; | |
495 | break; | |
496 | case LINK_FAILOVER_BEGIN_EVT: | |
497 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 498 | default: |
662921cd | 499 | goto illegal_evt; |
6ab30f9c JPM |
500 | } |
501 | break; | |
502 | default: | |
662921cd | 503 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 504 | } |
662921cd JPM |
505 | return rc; |
506 | illegal_evt: | |
507 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
508 | evt, l->state, l->name); | |
6ab30f9c JPM |
509 | return rc; |
510 | } | |
511 | ||
333ef69e JPM |
512 | /* link_profile_stats - update statistical profiling of traffic |
513 | */ | |
514 | static void link_profile_stats(struct tipc_link *l) | |
515 | { | |
516 | struct sk_buff *skb; | |
517 | struct tipc_msg *msg; | |
518 | int length; | |
519 | ||
520 | /* Update counters used in statistical profiling of send traffic */ | |
521 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
522 | l->stats.queue_sz_counts++; | |
523 | ||
524 | skb = skb_peek(&l->transmq); | |
525 | if (!skb) | |
526 | return; | |
527 | msg = buf_msg(skb); | |
528 | length = msg_size(msg); | |
529 | ||
530 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
531 | if (msg_type(msg) != FIRST_FRAGMENT) | |
532 | return; | |
533 | length = msg_size(msg_get_wrapped(msg)); | |
534 | } | |
535 | l->stats.msg_lengths_total += length; | |
536 | l->stats.msg_length_counts++; | |
537 | if (length <= 64) | |
538 | l->stats.msg_length_profile[0]++; | |
539 | else if (length <= 256) | |
540 | l->stats.msg_length_profile[1]++; | |
541 | else if (length <= 1024) | |
542 | l->stats.msg_length_profile[2]++; | |
543 | else if (length <= 4096) | |
544 | l->stats.msg_length_profile[3]++; | |
545 | else if (length <= 16384) | |
546 | l->stats.msg_length_profile[4]++; | |
547 | else if (length <= 32768) | |
548 | l->stats.msg_length_profile[5]++; | |
549 | else | |
550 | l->stats.msg_length_profile[6]++; | |
551 | } | |
552 | ||
52666986 JPM |
553 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
554 | */ | |
333ef69e JPM |
555 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
556 | */ | |
557 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
558 | { | |
559 | int rc = 0; | |
5045f7b9 JPM |
560 | int mtyp = STATE_MSG; |
561 | bool xmit = false; | |
562 | bool prb = false; | |
52666986 JPM |
563 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
564 | u16 bc_acked = l->bc_rcvlink->acked; | |
565 | bool bc_up = link_is_up(l->bc_rcvlink); | |
333ef69e JPM |
566 | |
567 | link_profile_stats(l); | |
5045f7b9 | 568 | |
662921cd JPM |
569 | switch (l->state) { |
570 | case LINK_ESTABLISHED: | |
571 | case LINK_SYNCHING: | |
5045f7b9 | 572 | if (!l->silent_intv_cnt) { |
52666986 | 573 | if (bc_up && (bc_acked != bc_snt)) |
5045f7b9 JPM |
574 | xmit = true; |
575 | } else if (l->silent_intv_cnt <= l->abort_limit) { | |
576 | xmit = true; | |
577 | prb = true; | |
578 | } else { | |
662921cd | 579 | rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
5045f7b9 JPM |
580 | } |
581 | l->silent_intv_cnt++; | |
662921cd JPM |
582 | break; |
583 | case LINK_RESET: | |
5045f7b9 JPM |
584 | xmit = true; |
585 | mtyp = RESET_MSG; | |
662921cd JPM |
586 | break; |
587 | case LINK_ESTABLISHING: | |
5045f7b9 JPM |
588 | xmit = true; |
589 | mtyp = ACTIVATE_MSG; | |
662921cd | 590 | break; |
662921cd | 591 | case LINK_PEER_RESET: |
598411d7 | 592 | case LINK_RESETTING: |
662921cd JPM |
593 | case LINK_FAILINGOVER: |
594 | break; | |
595 | default: | |
596 | break; | |
5045f7b9 | 597 | } |
662921cd | 598 | |
5045f7b9 JPM |
599 | if (xmit) |
600 | tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq); | |
601 | ||
333ef69e JPM |
602 | return rc; |
603 | } | |
604 | ||
b97bf3fd | 605 | /** |
3127a020 | 606 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 607 | * @link: congested link |
3127a020 | 608 | * @list: message that was attempted sent |
50100a5e | 609 | * Create pseudo msg to send back to user when congestion abates |
22d85c79 | 610 | * Does not consume buffer list |
b97bf3fd | 611 | */ |
3127a020 | 612 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 613 | { |
3127a020 JPM |
614 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
615 | int imp = msg_importance(msg); | |
616 | u32 oport = msg_origport(msg); | |
617 | u32 addr = link_own_addr(link); | |
618 | struct sk_buff *skb; | |
619 | ||
620 | /* This really cannot happen... */ | |
621 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
622 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
22d85c79 | 623 | return -ENOBUFS; |
3127a020 JPM |
624 | } |
625 | /* Non-blocking sender: */ | |
626 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
627 | return -ELINKCONG; | |
628 | ||
629 | /* Create and schedule wakeup pseudo message */ | |
630 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
631 | addr, addr, oport, 0, 0); | |
632 | if (!skb) | |
22d85c79 | 633 | return -ENOBUFS; |
3127a020 JPM |
634 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); |
635 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
636 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 637 | link->stats.link_congs++; |
3127a020 | 638 | return -ELINKCONG; |
b97bf3fd PL |
639 | } |
640 | ||
50100a5e JPM |
641 | /** |
642 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
643 | * @link: congested link | |
644 | * Move a number of waiting users, as permitted by available space in | |
645 | * the send queue, from link wait queue to node wait queue for wakeup | |
646 | */ | |
1f66d161 | 647 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 648 | { |
1f66d161 JPM |
649 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
650 | int imp, lim; | |
58d78b32 | 651 | struct sk_buff *skb, *tmp; |
50100a5e | 652 | |
1f66d161 JPM |
653 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
654 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
655 | lim = l->window + l->backlog[imp].limit; | |
656 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
657 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 658 | break; |
1f66d161 | 659 | skb_unlink(skb, &l->wakeupq); |
d39bbd44 | 660 | skb_queue_tail(l->inputq, skb); |
b97bf3fd | 661 | } |
b97bf3fd PL |
662 | } |
663 | ||
6e498158 | 664 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 665 | { |
a686e685 | 666 | /* Link is down, accept any session */ |
6e498158 | 667 | l->peer_session = WILDCARD_SESSION; |
b97bf3fd | 668 | |
6e498158 JPM |
669 | /* If peer is up, it only accepts an incremented session number */ |
670 | msg_set_session(l->pmsg, msg_session(l->pmsg) + 1); | |
b97bf3fd | 671 | |
6e498158 JPM |
672 | /* Prepare for renewed mtu size negotiation */ |
673 | l->mtu = l->advertised_mtu; | |
b97bf3fd | 674 | |
2af5ae37 | 675 | /* Clean up all queues and counters: */ |
6e498158 JPM |
676 | __skb_queue_purge(&l->transmq); |
677 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 678 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
2af5ae37 JPM |
679 | __skb_queue_purge(&l->backlogq); |
680 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
681 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
682 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
683 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
684 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
6e498158 JPM |
685 | kfree_skb(l->reasm_buf); |
686 | kfree_skb(l->failover_reasm_skb); | |
687 | l->reasm_buf = NULL; | |
688 | l->failover_reasm_skb = NULL; | |
689 | l->rcv_unacked = 0; | |
690 | l->snd_nxt = 1; | |
691 | l->rcv_nxt = 1; | |
c1ab3f1d | 692 | l->acked = 0; |
6e498158 JPM |
693 | l->silent_intv_cnt = 0; |
694 | l->stats.recv_info = 0; | |
695 | l->stale_count = 0; | |
52666986 | 696 | l->bc_peer_is_up = false; |
6e498158 | 697 | link_reset_statistics(l); |
b97bf3fd PL |
698 | } |
699 | ||
af9b028e JPM |
700 | /** |
701 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
702 | * @link: link to use | |
703 | * @list: chain of buffers containing message | |
704 | * @xmitq: returned list of packets to be sent by caller | |
705 | * | |
706 | * Consumes the buffer chain, except when returning -ELINKCONG, | |
707 | * since the caller then may want to make more send attempts. | |
708 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
709 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
710 | */ | |
711 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
712 | struct sk_buff_head *xmitq) | |
713 | { | |
714 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
715 | unsigned int maxwin = l->window; | |
716 | unsigned int i, imp = msg_importance(hdr); | |
717 | unsigned int mtu = l->mtu; | |
718 | u16 ack = l->rcv_nxt - 1; | |
719 | u16 seqno = l->snd_nxt; | |
52666986 | 720 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
af9b028e JPM |
721 | struct sk_buff_head *transmq = &l->transmq; |
722 | struct sk_buff_head *backlogq = &l->backlogq; | |
723 | struct sk_buff *skb, *_skb, *bskb; | |
724 | ||
725 | /* Match msg importance against this and all higher backlog limits: */ | |
726 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
727 | if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) | |
728 | return link_schedule_user(l, list); | |
729 | } | |
730 | if (unlikely(msg_size(hdr) > mtu)) | |
731 | return -EMSGSIZE; | |
732 | ||
733 | /* Prepare each packet for sending, and add to relevant queue: */ | |
734 | while (skb_queue_len(list)) { | |
735 | skb = skb_peek(list); | |
736 | hdr = buf_msg(skb); | |
737 | msg_set_seqno(hdr, seqno); | |
738 | msg_set_ack(hdr, ack); | |
52666986 | 739 | msg_set_bcast_ack(hdr, bc_ack); |
af9b028e JPM |
740 | |
741 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
742 | _skb = skb_clone(skb, GFP_ATOMIC); | |
743 | if (!_skb) | |
744 | return -ENOBUFS; | |
745 | __skb_dequeue(list); | |
746 | __skb_queue_tail(transmq, skb); | |
747 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 748 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e JPM |
749 | l->rcv_unacked = 0; |
750 | seqno++; | |
751 | continue; | |
752 | } | |
753 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
754 | kfree_skb(__skb_dequeue(list)); | |
755 | l->stats.sent_bundled++; | |
756 | continue; | |
757 | } | |
758 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
759 | kfree_skb(__skb_dequeue(list)); | |
760 | __skb_queue_tail(backlogq, bskb); | |
761 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
762 | l->stats.sent_bundled++; | |
763 | l->stats.sent_bundles++; | |
764 | continue; | |
765 | } | |
766 | l->backlog[imp].len += skb_queue_len(list); | |
767 | skb_queue_splice_tail_init(list, backlogq); | |
768 | } | |
769 | l->snd_nxt = seqno; | |
770 | return 0; | |
771 | } | |
772 | ||
d999297c JPM |
773 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
774 | { | |
775 | struct sk_buff *skb, *_skb; | |
776 | struct tipc_msg *hdr; | |
777 | u16 seqno = l->snd_nxt; | |
778 | u16 ack = l->rcv_nxt - 1; | |
52666986 | 779 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
780 | |
781 | while (skb_queue_len(&l->transmq) < l->window) { | |
782 | skb = skb_peek(&l->backlogq); | |
783 | if (!skb) | |
784 | break; | |
785 | _skb = skb_clone(skb, GFP_ATOMIC); | |
786 | if (!_skb) | |
787 | break; | |
788 | __skb_dequeue(&l->backlogq); | |
789 | hdr = buf_msg(skb); | |
790 | l->backlog[msg_importance(hdr)].len--; | |
791 | __skb_queue_tail(&l->transmq, skb); | |
792 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 793 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 794 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
795 | msg_set_ack(hdr, ack); |
796 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
797 | l->rcv_unacked = 0; |
798 | seqno++; | |
799 | } | |
800 | l->snd_nxt = seqno; | |
801 | } | |
802 | ||
52666986 | 803 | static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb) |
d356eeba | 804 | { |
52666986 JPM |
805 | struct tipc_msg *hdr = buf_msg(skb); |
806 | ||
807 | pr_warn("Retransmission failure on link <%s>\n", l->name); | |
808 | link_print(l, "Resetting link "); | |
809 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
810 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
811 | pr_info("sqno %u, prev: %x, src: %x\n", | |
812 | msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr)); | |
d356eeba AS |
813 | } |
814 | ||
c1ab3f1d JPM |
815 | int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to, |
816 | struct sk_buff_head *xmitq) | |
d999297c JPM |
817 | { |
818 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
819 | struct tipc_msg *hdr; | |
c1ab3f1d | 820 | u16 ack = l->rcv_nxt - 1; |
52666986 | 821 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
822 | |
823 | if (!skb) | |
824 | return 0; | |
825 | ||
826 | /* Detect repeated retransmit failures on same packet */ | |
827 | if (likely(l->last_retransm != buf_seqno(skb))) { | |
828 | l->last_retransm = buf_seqno(skb); | |
829 | l->stale_count = 1; | |
830 | } else if (++l->stale_count > 100) { | |
831 | link_retransmit_failure(l, skb); | |
662921cd | 832 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c | 833 | } |
c1ab3f1d JPM |
834 | |
835 | /* Move forward to where retransmission should start */ | |
d999297c | 836 | skb_queue_walk(&l->transmq, skb) { |
c1ab3f1d JPM |
837 | if (!less(buf_seqno(skb), from)) |
838 | break; | |
839 | } | |
840 | ||
841 | skb_queue_walk_from(&l->transmq, skb) { | |
842 | if (more(buf_seqno(skb), to)) | |
843 | break; | |
d999297c JPM |
844 | hdr = buf_msg(skb); |
845 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); | |
846 | if (!_skb) | |
847 | return 0; | |
848 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
849 | msg_set_ack(hdr, ack); |
850 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
851 | _skb->priority = TC_PRIO_CONTROL; |
852 | __skb_queue_tail(xmitq, _skb); | |
d999297c JPM |
853 | l->stats.retransmitted++; |
854 | } | |
855 | return 0; | |
856 | } | |
857 | ||
c637c103 | 858 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 859 | * |
c637c103 | 860 | * Consumes buffer if message is of right type |
7ae934be EH |
861 | * Node lock must be held |
862 | */ | |
52666986 | 863 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 864 | struct sk_buff_head *inputq) |
7ae934be | 865 | { |
9073fb8b | 866 | switch (msg_user(buf_msg(skb))) { |
c637c103 JPM |
867 | case TIPC_LOW_IMPORTANCE: |
868 | case TIPC_MEDIUM_IMPORTANCE: | |
869 | case TIPC_HIGH_IMPORTANCE: | |
870 | case TIPC_CRITICAL_IMPORTANCE: | |
871 | case CONN_MANAGER: | |
9945e804 | 872 | skb_queue_tail(inputq, skb); |
c637c103 | 873 | return true; |
7ae934be | 874 | case NAME_DISTRIBUTOR: |
52666986 JPM |
875 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
876 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
877 | return true; |
878 | case MSG_BUNDLER: | |
dff29b1a | 879 | case TUNNEL_PROTOCOL: |
c637c103 | 880 | case MSG_FRAGMENTER: |
7ae934be | 881 | case BCAST_PROTOCOL: |
c637c103 | 882 | return false; |
7ae934be | 883 | default: |
c637c103 JPM |
884 | pr_warn("Dropping received illegal msg type\n"); |
885 | kfree_skb(skb); | |
886 | return false; | |
887 | }; | |
7ae934be | 888 | } |
c637c103 JPM |
889 | |
890 | /* tipc_link_input - process packet that has passed link protocol check | |
891 | * | |
892 | * Consumes buffer | |
7ae934be | 893 | */ |
9073fb8b JPM |
894 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
895 | struct sk_buff_head *inputq) | |
7ae934be | 896 | { |
6e498158 JPM |
897 | struct tipc_msg *hdr = buf_msg(skb); |
898 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 899 | struct sk_buff *iskb; |
9945e804 | 900 | struct sk_buff_head tmpq; |
6e498158 | 901 | int usr = msg_user(hdr); |
6144a996 | 902 | int rc = 0; |
6e498158 JPM |
903 | int pos = 0; |
904 | int ipos = 0; | |
c637c103 | 905 | |
6e498158 JPM |
906 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
907 | if (msg_type(hdr) == SYNCH_MSG) { | |
908 | __skb_queue_purge(&l->deferdq); | |
909 | goto drop; | |
8b4ed863 | 910 | } |
6e498158 JPM |
911 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
912 | return rc; | |
913 | kfree_skb(skb); | |
914 | skb = iskb; | |
915 | hdr = buf_msg(skb); | |
916 | if (less(msg_seqno(hdr), l->drop_point)) | |
917 | goto drop; | |
9073fb8b | 918 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
919 | return rc; |
920 | usr = msg_user(hdr); | |
921 | reasm_skb = &l->failover_reasm_skb; | |
922 | } | |
c637c103 | 923 | |
6e498158 | 924 | if (usr == MSG_BUNDLER) { |
9945e804 | 925 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
926 | l->stats.recv_bundles++; |
927 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 928 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
929 | tipc_data_input(l, iskb, &tmpq); |
930 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 931 | return 0; |
6e498158 JPM |
932 | } else if (usr == MSG_FRAGMENTER) { |
933 | l->stats.recv_fragments++; | |
934 | if (tipc_buf_append(reasm_skb, &skb)) { | |
935 | l->stats.recv_fragmented++; | |
9073fb8b | 936 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
937 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
938 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 939 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 940 | } |
662921cd | 941 | return 0; |
6e498158 | 942 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 943 | tipc_bcast_lock(l->net); |
52666986 | 944 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 945 | tipc_bcast_unlock(l->net); |
6e498158 JPM |
946 | } |
947 | drop: | |
948 | kfree_skb(skb); | |
662921cd | 949 | return 0; |
7ae934be EH |
950 | } |
951 | ||
d999297c JPM |
952 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
953 | { | |
954 | bool released = false; | |
955 | struct sk_buff *skb, *tmp; | |
956 | ||
957 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
958 | if (more(buf_seqno(skb), acked)) | |
959 | break; | |
960 | __skb_unlink(skb, &l->transmq); | |
961 | kfree_skb(skb); | |
962 | released = true; | |
963 | } | |
964 | return released; | |
965 | } | |
966 | ||
f9aa358a | 967 | /* tipc_link_build_ack_msg: prepare link acknowledge message for transmission |
52666986 JPM |
968 | * |
969 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
970 | * risk of ack storms towards the sender | |
f9aa358a | 971 | */ |
52666986 | 972 | int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 973 | { |
52666986 JPM |
974 | if (!l) |
975 | return 0; | |
976 | ||
977 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
978 | if (link_is_bc_rcvlink(l)) { | |
979 | if (((l->rcv_nxt ^ link_own_addr(l)) & 0xf) != 0xf) | |
980 | return 0; | |
981 | l->rcv_unacked = 0; | |
982 | return TIPC_LINK_SND_BC_ACK; | |
983 | } | |
984 | ||
985 | /* Unicast ACK */ | |
f9aa358a JPM |
986 | l->rcv_unacked = 0; |
987 | l->stats.sent_acks++; | |
988 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
52666986 | 989 | return 0; |
f9aa358a JPM |
990 | } |
991 | ||
282b3a05 JPM |
992 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
993 | */ | |
994 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
995 | { | |
996 | int mtyp = RESET_MSG; | |
997 | ||
998 | if (l->state == LINK_ESTABLISHING) | |
999 | mtyp = ACTIVATE_MSG; | |
1000 | ||
1001 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq); | |
1002 | } | |
1003 | ||
f9aa358a JPM |
1004 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
1005 | */ | |
1006 | static void tipc_link_build_nack_msg(struct tipc_link *l, | |
1007 | struct sk_buff_head *xmitq) | |
1008 | { | |
1009 | u32 def_cnt = ++l->stats.deferred_recv; | |
1010 | ||
52666986 JPM |
1011 | if (link_is_bc_rcvlink(l)) |
1012 | return; | |
1013 | ||
f9aa358a JPM |
1014 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) |
1015 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
1016 | } | |
1017 | ||
d999297c | 1018 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1019 | * @l: the link that should handle the message |
d999297c JPM |
1020 | * @skb: TIPC packet |
1021 | * @xmitq: queue to place packets to be sent after this call | |
1022 | */ | |
1023 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1024 | struct sk_buff_head *xmitq) | |
1025 | { | |
f9aa358a | 1026 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1027 | struct tipc_msg *hdr; |
81204c49 | 1028 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1029 | int rc = 0; |
1030 | ||
f9aa358a | 1031 | do { |
d999297c | 1032 | hdr = buf_msg(skb); |
f9aa358a JPM |
1033 | seqno = msg_seqno(hdr); |
1034 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1035 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1036 | |
1037 | /* Verify and update link state */ | |
f9aa358a JPM |
1038 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1039 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1040 | |
662921cd | 1041 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1042 | if (l->state == LINK_ESTABLISHING) |
1043 | rc = TIPC_LINK_UP_EVT; | |
1044 | goto drop; | |
d999297c JPM |
1045 | } |
1046 | ||
f9aa358a | 1047 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1048 | l->silent_intv_cnt = 0; |
1049 | ||
81204c49 JPM |
1050 | /* Drop if outside receive window */ |
1051 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1052 | l->stats.duplicates++; | |
1053 | goto drop; | |
1054 | } | |
1055 | ||
d999297c JPM |
1056 | /* Forward queues and wake up waiting users */ |
1057 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1058 | tipc_link_advance_backlog(l, xmitq); | |
1059 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1060 | link_prepare_wakeup(l); | |
1061 | } | |
1062 | ||
81204c49 JPM |
1063 | /* Defer delivery if sequence gap */ |
1064 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1065 | __tipc_skb_queue_sorted(defq, seqno, skb); |
f9aa358a JPM |
1066 | tipc_link_build_nack_msg(l, xmitq); |
1067 | break; | |
d999297c JPM |
1068 | } |
1069 | ||
81204c49 | 1070 | /* Deliver packet */ |
d999297c JPM |
1071 | l->rcv_nxt++; |
1072 | l->stats.recv_info++; | |
f9aa358a | 1073 | if (!tipc_data_input(l, skb, l->inputq)) |
52666986 | 1074 | rc |= tipc_link_input(l, skb, l->inputq); |
f9aa358a | 1075 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
52666986 JPM |
1076 | rc |= tipc_link_build_ack_msg(l, xmitq); |
1077 | if (unlikely(rc & ~TIPC_LINK_SND_BC_ACK)) | |
1078 | break; | |
f9aa358a JPM |
1079 | } while ((skb = __skb_dequeue(defq))); |
1080 | ||
1081 | return rc; | |
1082 | drop: | |
1083 | kfree_skb(skb); | |
d999297c JPM |
1084 | return rc; |
1085 | } | |
1086 | ||
b97bf3fd PL |
1087 | /* |
1088 | * Send protocol message to the other endpoint. | |
1089 | */ | |
426cc2b8 | 1090 | void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg, |
ed193ece | 1091 | u32 gap, u32 tolerance, u32 priority) |
b97bf3fd | 1092 | { |
426cc2b8 JPM |
1093 | struct sk_buff *skb = NULL; |
1094 | struct sk_buff_head xmitq; | |
b97bf3fd | 1095 | |
426cc2b8 JPM |
1096 | __skb_queue_head_init(&xmitq); |
1097 | tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap, | |
1098 | tolerance, priority, &xmitq); | |
1099 | skb = __skb_dequeue(&xmitq); | |
1100 | if (!skb) | |
b97bf3fd | 1101 | return; |
c72fa872 | 1102 | tipc_bearer_xmit_skb(l->net, l->bearer_id, skb, l->media_addr); |
426cc2b8 | 1103 | l->rcv_unacked = 0; |
b97bf3fd PL |
1104 | } |
1105 | ||
426cc2b8 JPM |
1106 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
1107 | u16 rcvgap, int tolerance, int priority, | |
1108 | struct sk_buff_head *xmitq) | |
1109 | { | |
1110 | struct sk_buff *skb = NULL; | |
1111 | struct tipc_msg *hdr = l->pmsg; | |
52666986 | 1112 | bool node_up = link_is_up(l->bc_rcvlink); |
426cc2b8 JPM |
1113 | |
1114 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1115 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1116 | return; |
1117 | ||
426cc2b8 JPM |
1118 | msg_set_type(hdr, mtyp); |
1119 | msg_set_net_plane(hdr, l->net_plane); | |
52666986 JPM |
1120 | msg_set_next_sent(hdr, l->snd_nxt); |
1121 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
1122 | msg_set_bcast_ack(hdr, l->bc_rcvlink->rcv_nxt - 1); | |
1123 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
426cc2b8 JPM |
1124 | msg_set_link_tolerance(hdr, tolerance); |
1125 | msg_set_linkprio(hdr, priority); | |
1126 | msg_set_redundant_link(hdr, node_up); | |
1127 | msg_set_seq_gap(hdr, 0); | |
1128 | ||
1129 | /* Compatibility: created msg must not be in sequence with pkt flow */ | |
52666986 | 1130 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1131 | |
1132 | if (mtyp == STATE_MSG) { | |
1133 | if (!tipc_link_is_up(l)) | |
1134 | return; | |
426cc2b8 JPM |
1135 | |
1136 | /* Override rcvgap if there are packets in deferred queue */ | |
1137 | if (!skb_queue_empty(&l->deferdq)) | |
52666986 | 1138 | rcvgap = buf_seqno(skb_peek(&l->deferdq)) - l->rcv_nxt; |
426cc2b8 JPM |
1139 | if (rcvgap) { |
1140 | msg_set_seq_gap(hdr, rcvgap); | |
1141 | l->stats.sent_nacks++; | |
1142 | } | |
426cc2b8 JPM |
1143 | msg_set_probe(hdr, probe); |
1144 | if (probe) | |
1145 | l->stats.sent_probes++; | |
1146 | l->stats.sent_states++; | |
52666986 | 1147 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1148 | } else { |
1149 | /* RESET_MSG or ACTIVATE_MSG */ | |
1150 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
6e498158 | 1151 | msg_set_ack(hdr, l->rcv_nxt - 1); |
426cc2b8 JPM |
1152 | msg_set_next_sent(hdr, 1); |
1153 | } | |
1154 | skb = tipc_buf_acquire(msg_size(hdr)); | |
1155 | if (!skb) | |
1156 | return; | |
1157 | skb_copy_to_linear_data(skb, hdr, msg_size(hdr)); | |
1158 | skb->priority = TC_PRIO_CONTROL; | |
6e498158 | 1159 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1160 | } |
1161 | ||
6e498158 | 1162 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1163 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1164 | */ |
6e498158 JPM |
1165 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1166 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1167 | { |
6e498158 JPM |
1168 | struct sk_buff *skb, *tnlskb; |
1169 | struct tipc_msg *hdr, tnlhdr; | |
1170 | struct sk_buff_head *queue = &l->transmq; | |
1171 | struct sk_buff_head tmpxq, tnlq; | |
1172 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1173 | |
6e498158 | 1174 | if (!tnl) |
b97bf3fd PL |
1175 | return; |
1176 | ||
6e498158 JPM |
1177 | skb_queue_head_init(&tnlq); |
1178 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1179 | |
6e498158 JPM |
1180 | /* At least one packet required for safe algorithm => add dummy */ |
1181 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1182 | BASIC_H_SIZE, 0, l->addr, link_own_addr(l), | |
1183 | 0, 0, TIPC_ERR_NO_PORT); | |
1184 | if (!skb) { | |
1185 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1186 | return; |
1187 | } | |
6e498158 JPM |
1188 | skb_queue_tail(&tnlq, skb); |
1189 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1190 | __skb_queue_purge(&tmpxq); | |
1191 | ||
1192 | /* Initialize reusable tunnel packet header */ | |
1193 | tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL, | |
1194 | mtyp, INT_H_SIZE, l->addr); | |
1195 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1196 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1197 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1198 | tnl: | |
1199 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1200 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1201 | hdr = buf_msg(skb); |
1202 | if (queue == &l->backlogq) | |
1203 | msg_set_seqno(hdr, seqno++); | |
1204 | pktlen = msg_size(hdr); | |
1205 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
1206 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE); | |
1207 | if (!tnlskb) { | |
1208 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1209 | return; |
1210 | } | |
6e498158 JPM |
1211 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1212 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1213 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1214 | } |
6e498158 JPM |
1215 | if (queue != &l->backlogq) { |
1216 | queue = &l->backlogq; | |
1217 | goto tnl; | |
f006c9c7 | 1218 | } |
1dab3d5a | 1219 | |
6e498158 | 1220 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1221 | |
6e498158 JPM |
1222 | if (mtyp == FAILOVER_MSG) { |
1223 | tnl->drop_point = l->rcv_nxt; | |
1224 | tnl->failover_reasm_skb = l->reasm_buf; | |
1225 | l->reasm_buf = NULL; | |
2da71425 | 1226 | } |
b97bf3fd PL |
1227 | } |
1228 | ||
d999297c JPM |
1229 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1230 | * Note that network plane id propagates through the network, and may | |
1231 | * change at any time. The node with lowest numerical id determines | |
1232 | * network plane | |
1233 | */ | |
1234 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1235 | struct sk_buff_head *xmitq) | |
1236 | { | |
1237 | struct tipc_msg *hdr = buf_msg(skb); | |
1238 | u16 rcvgap = 0; | |
c1ab3f1d JPM |
1239 | u16 ack = msg_ack(hdr); |
1240 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1241 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1242 | u16 peers_tol = msg_link_tolerance(hdr); | |
1243 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1244 | u16 rcv_nxt = l->rcv_nxt; |
73f646ce | 1245 | int mtyp = msg_type(hdr); |
d999297c JPM |
1246 | char *if_name; |
1247 | int rc = 0; | |
1248 | ||
52666986 | 1249 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
1250 | goto exit; |
1251 | ||
1252 | if (link_own_addr(l) > msg_prevnode(hdr)) | |
1253 | l->net_plane = msg_net_plane(hdr); | |
1254 | ||
73f646ce | 1255 | switch (mtyp) { |
d999297c JPM |
1256 | case RESET_MSG: |
1257 | ||
1258 | /* Ignore duplicate RESET with old session number */ | |
1259 | if ((less_eq(msg_session(hdr), l->peer_session)) && | |
1260 | (l->peer_session != WILDCARD_SESSION)) | |
1261 | break; | |
1262 | /* fall thru' */ | |
662921cd | 1263 | |
d999297c JPM |
1264 | case ACTIVATE_MSG: |
1265 | ||
1266 | /* Complete own link name with peer's interface name */ | |
1267 | if_name = strrchr(l->name, ':') + 1; | |
1268 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1269 | break; | |
1270 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1271 | break; | |
1272 | strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME); | |
1273 | ||
1274 | /* Update own tolerance if peer indicates a non-zero value */ | |
1275 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1276 | l->tolerance = peers_tol; | |
1277 | ||
1278 | /* Update own priority if peer's priority is higher */ | |
1279 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1280 | l->priority = peers_prio; | |
1281 | ||
73f646ce JPM |
1282 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
1283 | if ((mtyp == RESET_MSG) || !link_is_up(l)) | |
1284 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); | |
1285 | ||
1286 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
1287 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) | |
1288 | rc = TIPC_LINK_UP_EVT; | |
1289 | ||
d999297c JPM |
1290 | l->peer_session = msg_session(hdr); |
1291 | l->peer_bearer_id = msg_bearer_id(hdr); | |
d999297c JPM |
1292 | if (l->mtu > msg_max_pkt(hdr)) |
1293 | l->mtu = msg_max_pkt(hdr); | |
1294 | break; | |
662921cd | 1295 | |
d999297c | 1296 | case STATE_MSG: |
662921cd | 1297 | |
d999297c JPM |
1298 | /* Update own tolerance if peer indicates a non-zero value */ |
1299 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1300 | l->tolerance = peers_tol; | |
1301 | ||
1302 | l->silent_intv_cnt = 0; | |
1303 | l->stats.recv_states++; | |
1304 | if (msg_probe(hdr)) | |
1305 | l->stats.recv_probes++; | |
73f646ce JPM |
1306 | |
1307 | if (!link_is_up(l)) { | |
1308 | if (l->state == LINK_ESTABLISHING) | |
1309 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1310 | break; |
73f646ce | 1311 | } |
d999297c | 1312 | |
662921cd | 1313 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1314 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c JPM |
1315 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
1316 | if (rcvgap || (msg_probe(hdr))) | |
1317 | tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap, | |
16040894 | 1318 | 0, 0, xmitq); |
c1ab3f1d | 1319 | tipc_link_release_pkts(l, ack); |
d999297c JPM |
1320 | |
1321 | /* If NACK, retransmit will now start at right position */ | |
c1ab3f1d JPM |
1322 | if (gap) { |
1323 | rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq); | |
d999297c JPM |
1324 | l->stats.recv_nacks++; |
1325 | } | |
662921cd | 1326 | |
d999297c JPM |
1327 | tipc_link_advance_backlog(l, xmitq); |
1328 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1329 | link_prepare_wakeup(l); | |
1330 | } | |
1331 | exit: | |
1332 | kfree_skb(skb); | |
1333 | return rc; | |
1334 | } | |
1335 | ||
52666986 JPM |
1336 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
1337 | */ | |
1338 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
1339 | u16 peers_snd_nxt, | |
1340 | struct sk_buff_head *xmitq) | |
1341 | { | |
1342 | struct sk_buff *skb; | |
1343 | struct tipc_msg *hdr; | |
1344 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
1345 | u16 ack = l->rcv_nxt - 1; | |
1346 | u16 gap_to = peers_snd_nxt - 1; | |
1347 | ||
1348 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
1349 | 0, l->addr, link_own_addr(l), 0, 0, 0); | |
1350 | if (!skb) | |
1351 | return false; | |
1352 | hdr = buf_msg(skb); | |
1353 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
1354 | msg_set_bcast_ack(hdr, ack); | |
1355 | msg_set_bcgap_after(hdr, ack); | |
1356 | if (dfrd_skb) | |
1357 | gap_to = buf_seqno(dfrd_skb) - 1; | |
1358 | msg_set_bcgap_to(hdr, gap_to); | |
1359 | msg_set_non_seq(hdr, bcast); | |
1360 | __skb_queue_tail(xmitq, skb); | |
1361 | return true; | |
1362 | } | |
1363 | ||
1364 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
1365 | * | |
1366 | * Give a newly added peer node the sequence number where it should | |
1367 | * start receiving and acking broadcast packets. | |
1368 | */ | |
742e0383 WF |
1369 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
1370 | struct sk_buff_head *xmitq) | |
52666986 JPM |
1371 | { |
1372 | struct sk_buff_head list; | |
1373 | ||
1374 | __skb_queue_head_init(&list); | |
1375 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
1376 | return; | |
1377 | tipc_link_xmit(l, &list, xmitq); | |
1378 | } | |
1379 | ||
1380 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
1381 | */ | |
1382 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
1383 | { | |
1384 | int mtyp = msg_type(hdr); | |
1385 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1386 | ||
1387 | if (link_is_up(l)) | |
1388 | return; | |
1389 | ||
1390 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
1391 | l->rcv_nxt = peers_snd_nxt; | |
1392 | l->state = LINK_ESTABLISHED; | |
1393 | return; | |
1394 | } | |
1395 | ||
1396 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
1397 | return; | |
1398 | ||
1399 | if (msg_peer_node_is_up(hdr)) | |
1400 | return; | |
1401 | ||
1402 | /* Compatibility: accept older, less safe initial synch data */ | |
1403 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
1404 | l->rcv_nxt = peers_snd_nxt; | |
1405 | } | |
1406 | ||
1407 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state | |
1408 | */ | |
1409 | void tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, | |
1410 | struct sk_buff_head *xmitq) | |
1411 | { | |
1412 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1413 | ||
1414 | if (!link_is_up(l)) | |
1415 | return; | |
1416 | ||
1417 | if (!msg_peer_node_is_up(hdr)) | |
1418 | return; | |
1419 | ||
1420 | l->bc_peer_is_up = true; | |
1421 | ||
1422 | /* Ignore if peers_snd_nxt goes beyond receive window */ | |
1423 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
1424 | return; | |
1425 | ||
1426 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
1427 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
1428 | return; | |
1429 | } | |
1430 | ||
1431 | /* Don't NACK if one was recently sent or peeked */ | |
1432 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
1433 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1434 | return; | |
1435 | } | |
1436 | ||
1437 | /* Conditionally delay NACK sending until next synch rcv */ | |
1438 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
1439 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1440 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
1441 | return; | |
1442 | } | |
1443 | ||
1444 | /* Send NACK now but suppress next one */ | |
1445 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
1446 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1447 | } | |
1448 | ||
1449 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, | |
1450 | struct sk_buff_head *xmitq) | |
1451 | { | |
1452 | struct sk_buff *skb, *tmp; | |
1453 | struct tipc_link *snd_l = l->bc_sndlink; | |
1454 | ||
1455 | if (!link_is_up(l) || !l->bc_peer_is_up) | |
1456 | return; | |
1457 | ||
1458 | if (!more(acked, l->acked)) | |
1459 | return; | |
1460 | ||
1461 | /* Skip over packets peer has already acked */ | |
1462 | skb_queue_walk(&snd_l->transmq, skb) { | |
1463 | if (more(buf_seqno(skb), l->acked)) | |
1464 | break; | |
1465 | } | |
1466 | ||
1467 | /* Update/release the packets peer is acking now */ | |
1468 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { | |
1469 | if (more(buf_seqno(skb), acked)) | |
1470 | break; | |
1471 | if (!--TIPC_SKB_CB(skb)->ackers) { | |
1472 | __skb_unlink(skb, &snd_l->transmq); | |
1473 | kfree_skb(skb); | |
1474 | } | |
1475 | } | |
1476 | l->acked = acked; | |
1477 | tipc_link_advance_backlog(snd_l, xmitq); | |
1478 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) | |
1479 | link_prepare_wakeup(snd_l); | |
1480 | } | |
1481 | ||
1482 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
1483 | */ | |
1484 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1485 | struct sk_buff_head *xmitq) | |
1486 | { | |
1487 | struct tipc_msg *hdr = buf_msg(skb); | |
1488 | u32 dnode = msg_destnode(hdr); | |
1489 | int mtyp = msg_type(hdr); | |
1490 | u16 acked = msg_bcast_ack(hdr); | |
1491 | u16 from = acked + 1; | |
1492 | u16 to = msg_bcgap_to(hdr); | |
1493 | u16 peers_snd_nxt = to + 1; | |
1494 | int rc = 0; | |
1495 | ||
1496 | kfree_skb(skb); | |
1497 | ||
1498 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
1499 | return 0; | |
1500 | ||
1501 | if (mtyp != STATE_MSG) | |
1502 | return 0; | |
1503 | ||
1504 | if (dnode == link_own_addr(l)) { | |
1505 | tipc_link_bc_ack_rcv(l, acked, xmitq); | |
1506 | rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq); | |
1507 | l->stats.recv_nacks++; | |
1508 | return rc; | |
1509 | } | |
1510 | ||
1511 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
1512 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
1513 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1514 | ||
1515 | return 0; | |
1516 | } | |
1517 | ||
e3eea1eb | 1518 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1519 | { |
ed193ece | 1520 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1521 | |
1522 | l->window = win; | |
1f66d161 JPM |
1523 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1524 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1525 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1526 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1527 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1528 | } |
1529 | ||
e099e86c | 1530 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1531 | * @net: the applicable net namespace |
e099e86c JPM |
1532 | * @name: pointer to link name string |
1533 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1534 | * |
e099e86c | 1535 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1536 | */ |
f2f9800d YX |
1537 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1538 | const char *link_name, | |
e099e86c | 1539 | unsigned int *bearer_id) |
b97bf3fd | 1540 | { |
f2f9800d | 1541 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1542 | struct tipc_link *l_ptr; |
bbfbe47c | 1543 | struct tipc_node *n_ptr; |
886eaa1f | 1544 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1545 | int i; |
b97bf3fd | 1546 | |
e099e86c | 1547 | *bearer_id = 0; |
6c7a762e | 1548 | rcu_read_lock(); |
f2f9800d | 1549 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1550 | tipc_node_lock(n_ptr); |
bbfbe47c | 1551 | for (i = 0; i < MAX_BEARERS; i++) { |
9d13ec65 | 1552 | l_ptr = n_ptr->links[i].link; |
e099e86c JPM |
1553 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1554 | *bearer_id = i; | |
1555 | found_node = n_ptr; | |
1556 | break; | |
1557 | } | |
bbfbe47c | 1558 | } |
a11607f5 | 1559 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1560 | if (found_node) |
1561 | break; | |
bbfbe47c | 1562 | } |
6c7a762e YX |
1563 | rcu_read_unlock(); |
1564 | ||
e099e86c | 1565 | return found_node; |
b97bf3fd PL |
1566 | } |
1567 | ||
b97bf3fd PL |
1568 | /** |
1569 | * link_reset_statistics - reset link statistics | |
1570 | * @l_ptr: pointer to link | |
1571 | */ | |
a18c4bc3 | 1572 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1573 | { |
1574 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
a97b9d3f JPM |
1575 | l_ptr->stats.sent_info = l_ptr->snd_nxt; |
1576 | l_ptr->stats.recv_info = l_ptr->rcv_nxt; | |
b97bf3fd PL |
1577 | } |
1578 | ||
1a20cc25 | 1579 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1580 | { |
1a20cc25 | 1581 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 1582 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 1583 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 1584 | |
662921cd | 1585 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1586 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1587 | skb_queue_len(&l->transmq), head, tail, | |
1588 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1589 | } |
0655f6a8 RA |
1590 | |
1591 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1592 | */ | |
1593 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1594 | { | |
1595 | int err; | |
1596 | ||
1597 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1598 | tipc_nl_prop_policy); | |
1599 | if (err) | |
1600 | return err; | |
1601 | ||
1602 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1603 | u32 prio; | |
1604 | ||
1605 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1606 | if (prio > TIPC_MAX_LINK_PRI) | |
1607 | return -EINVAL; | |
1608 | } | |
1609 | ||
1610 | if (props[TIPC_NLA_PROP_TOL]) { | |
1611 | u32 tol; | |
1612 | ||
1613 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1614 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1615 | return -EINVAL; | |
1616 | } | |
1617 | ||
1618 | if (props[TIPC_NLA_PROP_WIN]) { | |
1619 | u32 win; | |
1620 | ||
1621 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1622 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1623 | return -EINVAL; | |
1624 | } | |
1625 | ||
1626 | return 0; | |
1627 | } | |
7be57fc6 | 1628 | |
f96ce7a2 RA |
1629 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
1630 | { | |
1631 | int err; | |
1632 | int res = 0; | |
1633 | int bearer_id; | |
1634 | char *name; | |
1635 | struct tipc_link *link; | |
1636 | struct tipc_node *node; | |
1637 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
37e2d484 | 1638 | struct net *net = sock_net(skb->sk); |
f96ce7a2 RA |
1639 | |
1640 | if (!info->attrs[TIPC_NLA_LINK]) | |
1641 | return -EINVAL; | |
1642 | ||
1643 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1644 | info->attrs[TIPC_NLA_LINK], | |
1645 | tipc_nl_link_policy); | |
1646 | if (err) | |
1647 | return err; | |
1648 | ||
1649 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1650 | return -EINVAL; | |
1651 | ||
1652 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1653 | ||
670f4f88 RA |
1654 | if (strcmp(name, tipc_bclink_name) == 0) |
1655 | return tipc_nl_bc_link_set(net, attrs); | |
1656 | ||
f2f9800d | 1657 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
1658 | if (!node) |
1659 | return -EINVAL; | |
1660 | ||
1661 | tipc_node_lock(node); | |
1662 | ||
9d13ec65 | 1663 | link = node->links[bearer_id].link; |
f96ce7a2 RA |
1664 | if (!link) { |
1665 | res = -EINVAL; | |
1666 | goto out; | |
1667 | } | |
1668 | ||
1669 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
1670 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
1671 | ||
1672 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
1673 | props); | |
1674 | if (err) { | |
1675 | res = err; | |
1676 | goto out; | |
1677 | } | |
1678 | ||
1679 | if (props[TIPC_NLA_PROP_TOL]) { | |
1680 | u32 tol; | |
1681 | ||
1682 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
8a1577c9 | 1683 | link->tolerance = tol; |
ed193ece | 1684 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0); |
f96ce7a2 RA |
1685 | } |
1686 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1687 | u32 prio; | |
1688 | ||
1689 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1690 | link->priority = prio; | |
ed193ece | 1691 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio); |
f96ce7a2 RA |
1692 | } |
1693 | if (props[TIPC_NLA_PROP_WIN]) { | |
1694 | u32 win; | |
1695 | ||
1696 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1697 | tipc_link_set_queue_limits(link, win); | |
1698 | } | |
1699 | } | |
1700 | ||
1701 | out: | |
1702 | tipc_node_unlock(node); | |
1703 | ||
1704 | return res; | |
1705 | } | |
d8182804 RA |
1706 | |
1707 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
1708 | { |
1709 | int i; | |
1710 | struct nlattr *stats; | |
1711 | ||
1712 | struct nla_map { | |
1713 | u32 key; | |
1714 | u32 val; | |
1715 | }; | |
1716 | ||
1717 | struct nla_map map[] = { | |
1718 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1719 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1720 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1721 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1722 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
1723 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
1724 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
1725 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1726 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1727 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1728 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1729 | s->msg_length_counts : 1}, | |
1730 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1731 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1732 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1733 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1734 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1735 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1736 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1737 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1738 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1739 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1740 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1741 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1742 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1743 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1744 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1745 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1746 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1747 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1748 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1749 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1750 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1751 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1752 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1753 | }; | |
1754 | ||
1755 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1756 | if (!stats) | |
1757 | return -EMSGSIZE; | |
1758 | ||
1759 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1760 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1761 | goto msg_full; | |
1762 | ||
1763 | nla_nest_end(skb, stats); | |
1764 | ||
1765 | return 0; | |
1766 | msg_full: | |
1767 | nla_nest_cancel(skb, stats); | |
1768 | ||
1769 | return -EMSGSIZE; | |
1770 | } | |
1771 | ||
1772 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 | 1773 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
f2f67390 | 1774 | struct tipc_link *link, int nlflags) |
7be57fc6 RA |
1775 | { |
1776 | int err; | |
1777 | void *hdr; | |
1778 | struct nlattr *attrs; | |
1779 | struct nlattr *prop; | |
34747539 | 1780 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 1781 | |
bfb3e5dd | 1782 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1783 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1784 | if (!hdr) |
1785 | return -EMSGSIZE; | |
1786 | ||
1787 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1788 | if (!attrs) | |
1789 | goto msg_full; | |
1790 | ||
1791 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
1792 | goto attr_msg_full; | |
1793 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 1794 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 1795 | goto attr_msg_full; |
ed193ece | 1796 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 1797 | goto attr_msg_full; |
a97b9d3f | 1798 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
7be57fc6 | 1799 | goto attr_msg_full; |
a97b9d3f | 1800 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
7be57fc6 RA |
1801 | goto attr_msg_full; |
1802 | ||
1803 | if (tipc_link_is_up(link)) | |
1804 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1805 | goto attr_msg_full; | |
c72fa872 | 1806 | if (link->active) |
7be57fc6 RA |
1807 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
1808 | goto attr_msg_full; | |
1809 | ||
1810 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1811 | if (!prop) | |
1812 | goto attr_msg_full; | |
1813 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1814 | goto prop_msg_full; | |
1815 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
1816 | goto prop_msg_full; | |
1817 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 1818 | link->window)) |
7be57fc6 RA |
1819 | goto prop_msg_full; |
1820 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1821 | goto prop_msg_full; | |
1822 | nla_nest_end(msg->skb, prop); | |
1823 | ||
1824 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
1825 | if (err) | |
1826 | goto attr_msg_full; | |
1827 | ||
1828 | nla_nest_end(msg->skb, attrs); | |
1829 | genlmsg_end(msg->skb, hdr); | |
1830 | ||
1831 | return 0; | |
1832 | ||
1833 | prop_msg_full: | |
1834 | nla_nest_cancel(msg->skb, prop); | |
1835 | attr_msg_full: | |
1836 | nla_nest_cancel(msg->skb, attrs); | |
1837 | msg_full: | |
1838 | genlmsg_cancel(msg->skb, hdr); | |
1839 | ||
1840 | return -EMSGSIZE; | |
1841 | } | |
1842 | ||
1843 | /* Caller should hold node lock */ | |
34747539 YX |
1844 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
1845 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
1846 | { |
1847 | u32 i; | |
1848 | int err; | |
1849 | ||
1850 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
1851 | *prev_link = i; | |
1852 | ||
9d13ec65 | 1853 | if (!node->links[i].link) |
7be57fc6 RA |
1854 | continue; |
1855 | ||
9d13ec65 JPM |
1856 | err = __tipc_nl_add_link(net, msg, |
1857 | node->links[i].link, NLM_F_MULTI); | |
7be57fc6 RA |
1858 | if (err) |
1859 | return err; | |
1860 | } | |
1861 | *prev_link = 0; | |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
1866 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1867 | { | |
f2f9800d YX |
1868 | struct net *net = sock_net(skb->sk); |
1869 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
1870 | struct tipc_node *node; |
1871 | struct tipc_nl_msg msg; | |
1872 | u32 prev_node = cb->args[0]; | |
1873 | u32 prev_link = cb->args[1]; | |
1874 | int done = cb->args[2]; | |
1875 | int err; | |
1876 | ||
1877 | if (done) | |
1878 | return 0; | |
1879 | ||
1880 | msg.skb = skb; | |
1881 | msg.portid = NETLINK_CB(cb->skb).portid; | |
1882 | msg.seq = cb->nlh->nlmsg_seq; | |
1883 | ||
1884 | rcu_read_lock(); | |
7be57fc6 | 1885 | if (prev_node) { |
f2f9800d | 1886 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
1887 | if (!node) { |
1888 | /* We never set seq or call nl_dump_check_consistent() | |
1889 | * this means that setting prev_seq here will cause the | |
1890 | * consistence check to fail in the netlink callback | |
1891 | * handler. Resulting in the last NLMSG_DONE message | |
1892 | * having the NLM_F_DUMP_INTR flag set. | |
1893 | */ | |
1894 | cb->prev_seq = 1; | |
1895 | goto out; | |
1896 | } | |
8a0f6ebe | 1897 | tipc_node_put(node); |
7be57fc6 | 1898 | |
f2f9800d YX |
1899 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
1900 | 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 | } else { | |
1da46568 | 1911 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
1912 | if (err) |
1913 | goto out; | |
1914 | ||
f2f9800d | 1915 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 1916 | tipc_node_lock(node); |
34747539 YX |
1917 | err = __tipc_nl_add_node_links(net, &msg, node, |
1918 | &prev_link); | |
7be57fc6 RA |
1919 | tipc_node_unlock(node); |
1920 | if (err) | |
1921 | goto out; | |
1922 | ||
1923 | prev_node = node->addr; | |
1924 | } | |
1925 | } | |
1926 | done = 1; | |
1927 | out: | |
1928 | rcu_read_unlock(); | |
1929 | ||
1930 | cb->args[0] = prev_node; | |
1931 | cb->args[1] = prev_link; | |
1932 | cb->args[2] = done; | |
1933 | ||
1934 | return skb->len; | |
1935 | } | |
1936 | ||
1937 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
1938 | { | |
f2f9800d | 1939 | struct net *net = genl_info_net(info); |
7be57fc6 | 1940 | struct tipc_nl_msg msg; |
7be57fc6 | 1941 | char *name; |
7be57fc6 RA |
1942 | int err; |
1943 | ||
670f4f88 RA |
1944 | msg.portid = info->snd_portid; |
1945 | msg.seq = info->snd_seq; | |
1946 | ||
7be57fc6 RA |
1947 | if (!info->attrs[TIPC_NLA_LINK_NAME]) |
1948 | return -EINVAL; | |
7be57fc6 | 1949 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); |
7be57fc6 | 1950 | |
670f4f88 RA |
1951 | msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1952 | if (!msg.skb) | |
7be57fc6 RA |
1953 | return -ENOMEM; |
1954 | ||
670f4f88 RA |
1955 | if (strcmp(name, tipc_bclink_name) == 0) { |
1956 | err = tipc_nl_add_bc_link(net, &msg); | |
1957 | if (err) { | |
1958 | nlmsg_free(msg.skb); | |
1959 | return err; | |
1960 | } | |
1961 | } else { | |
1962 | int bearer_id; | |
1963 | struct tipc_node *node; | |
1964 | struct tipc_link *link; | |
7be57fc6 | 1965 | |
670f4f88 RA |
1966 | node = tipc_link_find_owner(net, name, &bearer_id); |
1967 | if (!node) | |
1968 | return -EINVAL; | |
7be57fc6 | 1969 | |
670f4f88 | 1970 | tipc_node_lock(node); |
9d13ec65 | 1971 | link = node->links[bearer_id].link; |
670f4f88 RA |
1972 | if (!link) { |
1973 | tipc_node_unlock(node); | |
1974 | nlmsg_free(msg.skb); | |
1975 | return -EINVAL; | |
1976 | } | |
7be57fc6 | 1977 | |
670f4f88 RA |
1978 | err = __tipc_nl_add_link(net, &msg, link, 0); |
1979 | tipc_node_unlock(node); | |
1980 | if (err) { | |
1981 | nlmsg_free(msg.skb); | |
1982 | return err; | |
1983 | } | |
1984 | } | |
7be57fc6 | 1985 | |
670f4f88 | 1986 | return genlmsg_reply(msg.skb, info); |
7be57fc6 | 1987 | } |
ae36342b RA |
1988 | |
1989 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
1990 | { | |
1991 | int err; | |
1992 | char *link_name; | |
1993 | unsigned int bearer_id; | |
1994 | struct tipc_link *link; | |
1995 | struct tipc_node *node; | |
1996 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
1817877b | 1997 | struct net *net = sock_net(skb->sk); |
ae36342b RA |
1998 | |
1999 | if (!info->attrs[TIPC_NLA_LINK]) | |
2000 | return -EINVAL; | |
2001 | ||
2002 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2003 | info->attrs[TIPC_NLA_LINK], | |
2004 | tipc_nl_link_policy); | |
2005 | if (err) | |
2006 | return err; | |
2007 | ||
2008 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2009 | return -EINVAL; | |
2010 | ||
2011 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2012 | ||
2013 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 2014 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
2015 | if (err) |
2016 | return err; | |
2017 | return 0; | |
2018 | } | |
2019 | ||
f2f9800d | 2020 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2021 | if (!node) |
2022 | return -EINVAL; | |
2023 | ||
2024 | tipc_node_lock(node); | |
2025 | ||
9d13ec65 | 2026 | link = node->links[bearer_id].link; |
ae36342b RA |
2027 | if (!link) { |
2028 | tipc_node_unlock(node); | |
2029 | return -EINVAL; | |
2030 | } | |
2031 | ||
2032 | link_reset_statistics(link); | |
2033 | ||
2034 | tipc_node_unlock(node); | |
2035 | ||
2036 | return 0; | |
2037 | } |