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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
c1336ee4 | 4 | * Copyright (c) 1996-2007, 2012-2015, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
e3eea1eb | 38 | #include "subscr.h" |
b97bf3fd | 39 | #include "link.h" |
7be57fc6 | 40 | #include "bcast.h" |
9816f061 | 41 | #include "socket.h" |
b97bf3fd | 42 | #include "name_distr.h" |
b97bf3fd | 43 | #include "discover.h" |
0655f6a8 | 44 | #include "netlink.h" |
b97bf3fd | 45 | |
796c75d0 YX |
46 | #include <linux/pkt_sched.h> |
47 | ||
2cf8aa19 EH |
48 | /* |
49 | * Error message prefixes | |
50 | */ | |
6e498158 | 51 | static const char *link_co_err = "Link tunneling error, "; |
2cf8aa19 | 52 | static const char *link_rst_msg = "Resetting link "; |
32301906 | 53 | static const char tipc_bclink_name[] = "broadcast-link"; |
b97bf3fd | 54 | |
7be57fc6 RA |
55 | static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = { |
56 | [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC }, | |
57 | [TIPC_NLA_LINK_NAME] = { | |
58 | .type = NLA_STRING, | |
59 | .len = TIPC_MAX_LINK_NAME | |
60 | }, | |
61 | [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 }, | |
62 | [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG }, | |
63 | [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG }, | |
64 | [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG }, | |
65 | [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED }, | |
66 | [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED }, | |
67 | [TIPC_NLA_LINK_RX] = { .type = NLA_U32 }, | |
68 | [TIPC_NLA_LINK_TX] = { .type = NLA_U32 } | |
69 | }; | |
70 | ||
0655f6a8 RA |
71 | /* Properties valid for media, bearar and link */ |
72 | static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { | |
73 | [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, | |
74 | [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, | |
75 | [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, | |
76 | [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } | |
77 | }; | |
78 | ||
d999297c JPM |
79 | /* |
80 | * Interval between NACKs when packets arrive out of order | |
81 | */ | |
82 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
a686e685 AS |
83 | /* |
84 | * Out-of-range value for link session numbers | |
85 | */ | |
d3504c34 | 86 | #define WILDCARD_SESSION 0x10000 |
a686e685 | 87 | |
662921cd | 88 | /* Link FSM states: |
b97bf3fd | 89 | */ |
d3504c34 | 90 | enum { |
662921cd JPM |
91 | LINK_ESTABLISHED = 0xe, |
92 | LINK_ESTABLISHING = 0xe << 4, | |
93 | LINK_RESET = 0x1 << 8, | |
94 | LINK_RESETTING = 0x2 << 12, | |
95 | LINK_PEER_RESET = 0xd << 16, | |
96 | LINK_FAILINGOVER = 0xf << 20, | |
97 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
98 | }; |
99 | ||
100 | /* Link FSM state checking routines | |
101 | */ | |
662921cd | 102 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 103 | { |
662921cd | 104 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 105 | } |
b97bf3fd | 106 | |
d999297c JPM |
107 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
108 | struct sk_buff_head *xmitq); | |
426cc2b8 JPM |
109 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
110 | u16 rcvgap, int tolerance, int priority, | |
111 | struct sk_buff_head *xmitq); | |
a18c4bc3 PG |
112 | static void link_reset_statistics(struct tipc_link *l_ptr); |
113 | static void link_print(struct tipc_link *l_ptr, const char *str); | |
247f0f3c | 114 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf); |
8b4ed863 | 115 | |
b97bf3fd | 116 | /* |
05790c64 | 117 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 118 | */ |
662921cd | 119 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 120 | { |
662921cd JPM |
121 | return link_is_up(l); |
122 | } | |
123 | ||
c8199300 JPM |
124 | bool tipc_link_peer_is_down(struct tipc_link *l) |
125 | { | |
126 | return l->state == LINK_PEER_RESET; | |
127 | } | |
128 | ||
662921cd JPM |
129 | bool tipc_link_is_reset(struct tipc_link *l) |
130 | { | |
131 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
132 | } | |
133 | ||
73f646ce JPM |
134 | bool tipc_link_is_establishing(struct tipc_link *l) |
135 | { | |
136 | return l->state == LINK_ESTABLISHING; | |
137 | } | |
138 | ||
662921cd JPM |
139 | bool tipc_link_is_synching(struct tipc_link *l) |
140 | { | |
141 | return l->state == LINK_SYNCHING; | |
142 | } | |
143 | ||
144 | bool tipc_link_is_failingover(struct tipc_link *l) | |
145 | { | |
146 | return l->state == LINK_FAILINGOVER; | |
147 | } | |
148 | ||
149 | bool tipc_link_is_blocked(struct tipc_link *l) | |
150 | { | |
151 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
152 | } |
153 | ||
9d13ec65 | 154 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 155 | { |
9d13ec65 JPM |
156 | struct tipc_node *n = l->owner; |
157 | ||
158 | return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l); | |
b97bf3fd PL |
159 | } |
160 | ||
2f566124 JPM |
161 | void tipc_link_add_bc_peer(struct tipc_link *l) |
162 | { | |
163 | l->ackers++; | |
164 | } | |
165 | ||
166 | void tipc_link_remove_bc_peer(struct tipc_link *l) | |
167 | { | |
168 | l->ackers--; | |
169 | } | |
170 | ||
171 | int tipc_link_bc_peers(struct tipc_link *l) | |
172 | { | |
173 | return l->ackers; | |
174 | } | |
175 | ||
440d8963 JPM |
176 | static u32 link_own_addr(struct tipc_link *l) |
177 | { | |
178 | return msg_prevnode(l->pmsg); | |
179 | } | |
180 | ||
b97bf3fd | 181 | /** |
4323add6 | 182 | * tipc_link_create - create a new link |
440d8963 | 183 | * @n: pointer to associated node |
0e05498e JPM |
184 | * @if_name: associated interface name |
185 | * @bearer_id: id (index) of associated bearer | |
186 | * @tolerance: link tolerance to be used by link | |
187 | * @net_plane: network plane (A,B,c..) this link belongs to | |
188 | * @mtu: mtu to be advertised by link | |
189 | * @priority: priority to be used by link | |
190 | * @window: send window to be used by link | |
191 | * @session: session to be used by link | |
440d8963 | 192 | * @ownnode: identity of own node |
0e05498e | 193 | * @peer: node id of peer node |
fd556f20 | 194 | * @peer_caps: bitmap describing peer node capabilities |
440d8963 JPM |
195 | * @maddr: media address to be used |
196 | * @inputq: queue to put messages ready for delivery | |
197 | * @namedq: queue to put binding table update messages ready for delivery | |
198 | * @link: return value, pointer to put the created link | |
c4307285 | 199 | * |
440d8963 | 200 | * Returns true if link was created, otherwise false |
b97bf3fd | 201 | */ |
0e05498e JPM |
202 | bool tipc_link_create(struct tipc_node *n, char *if_name, int bearer_id, |
203 | int tolerance, char net_plane, u32 mtu, int priority, | |
204 | int window, u32 session, u32 ownnode, u32 peer, | |
fd556f20 | 205 | u16 peer_caps, struct tipc_media_addr *maddr, |
440d8963 JPM |
206 | struct sk_buff_head *inputq, struct sk_buff_head *namedq, |
207 | struct tipc_link **link) | |
b97bf3fd | 208 | { |
440d8963 JPM |
209 | struct tipc_link *l; |
210 | struct tipc_msg *hdr; | |
37b9c08a | 211 | |
440d8963 JPM |
212 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
213 | if (!l) | |
214 | return false; | |
215 | *link = l; | |
0e05498e JPM |
216 | l->pmsg = (struct tipc_msg *)&l->proto_msg; |
217 | hdr = l->pmsg; | |
218 | tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer); | |
219 | msg_set_size(hdr, sizeof(l->proto_msg)); | |
220 | msg_set_session(hdr, session); | |
221 | msg_set_bearer_id(hdr, l->bearer_id); | |
37b9c08a | 222 | |
440d8963 | 223 | /* Note: peer i/f name is completed by reset/activate message */ |
440d8963 JPM |
224 | sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
225 | tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode), | |
226 | if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
0e05498e | 227 | strcpy((char *)msg_data(hdr), if_name); |
b97bf3fd | 228 | |
440d8963 | 229 | l->addr = peer; |
fd556f20 | 230 | l->peer_caps = peer_caps; |
440d8963 JPM |
231 | l->media_addr = maddr; |
232 | l->owner = n; | |
233 | l->peer_session = WILDCARD_SESSION; | |
0e05498e JPM |
234 | l->bearer_id = bearer_id; |
235 | l->tolerance = tolerance; | |
236 | l->net_plane = net_plane; | |
237 | l->advertised_mtu = mtu; | |
238 | l->mtu = mtu; | |
239 | l->priority = priority; | |
240 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 241 | l->ackers = 1; |
440d8963 JPM |
242 | l->inputq = inputq; |
243 | l->namedq = namedq; | |
244 | l->state = LINK_RESETTING; | |
440d8963 JPM |
245 | __skb_queue_head_init(&l->transmq); |
246 | __skb_queue_head_init(&l->backlogq); | |
247 | __skb_queue_head_init(&l->deferdq); | |
248 | skb_queue_head_init(&l->wakeupq); | |
249 | skb_queue_head_init(l->inputq); | |
250 | return true; | |
b97bf3fd PL |
251 | } |
252 | ||
32301906 JPM |
253 | /** |
254 | * tipc_link_bc_create - create new link to be used for broadcast | |
255 | * @n: pointer to associated node | |
256 | * @mtu: mtu to be used | |
257 | * @window: send window to be used | |
258 | * @inputq: queue to put messages ready for delivery | |
259 | * @namedq: queue to put binding table update messages ready for delivery | |
260 | * @link: return value, pointer to put the created link | |
261 | * | |
262 | * Returns true if link was created, otherwise false | |
263 | */ | |
264 | bool tipc_link_bc_create(struct tipc_node *n, int mtu, int window, | |
fd556f20 | 265 | u16 peer_caps, |
32301906 JPM |
266 | struct sk_buff_head *inputq, |
267 | struct sk_buff_head *namedq, | |
268 | struct tipc_link **link) | |
269 | { | |
270 | struct tipc_link *l; | |
271 | ||
272 | if (!tipc_link_create(n, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, | |
fd556f20 | 273 | 0, 0, 0, peer_caps, NULL, inputq, namedq, link)) |
32301906 JPM |
274 | return false; |
275 | ||
276 | l = *link; | |
277 | strcpy(l->name, tipc_bclink_name); | |
278 | tipc_link_reset(l); | |
2f566124 | 279 | l->ackers = 0; |
32301906 JPM |
280 | return true; |
281 | } | |
282 | ||
d999297c JPM |
283 | /* tipc_link_build_bcast_sync_msg() - synchronize broadcast link endpoints. |
284 | * | |
285 | * Give a newly added peer node the sequence number where it should | |
286 | * start receiving and acking broadcast packets. | |
287 | */ | |
5045f7b9 JPM |
288 | void tipc_link_build_bcast_sync_msg(struct tipc_link *l, |
289 | struct sk_buff_head *xmitq) | |
d999297c JPM |
290 | { |
291 | struct sk_buff *skb; | |
292 | struct sk_buff_head list; | |
5a4c3552 | 293 | u16 last_sent; |
d999297c JPM |
294 | |
295 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
296 | 0, l->addr, link_own_addr(l), 0, 0, 0); | |
297 | if (!skb) | |
298 | return; | |
5a4c3552 JM |
299 | last_sent = tipc_bclink_get_last_sent(l->owner->net); |
300 | msg_set_last_bcast(buf_msg(skb), last_sent); | |
d999297c JPM |
301 | __skb_queue_head_init(&list); |
302 | __skb_queue_tail(&list, skb); | |
303 | tipc_link_xmit(l, &list, xmitq); | |
304 | } | |
305 | ||
6ab30f9c JPM |
306 | /** |
307 | * tipc_link_fsm_evt - link finite state machine | |
308 | * @l: pointer to link | |
309 | * @evt: state machine event to be processed | |
6ab30f9c | 310 | */ |
662921cd | 311 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 312 | { |
5045f7b9 | 313 | int rc = 0; |
6ab30f9c JPM |
314 | |
315 | switch (l->state) { | |
662921cd | 316 | case LINK_RESETTING: |
6ab30f9c | 317 | switch (evt) { |
662921cd JPM |
318 | case LINK_PEER_RESET_EVT: |
319 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 320 | break; |
662921cd JPM |
321 | case LINK_RESET_EVT: |
322 | l->state = LINK_RESET; | |
323 | break; | |
324 | case LINK_FAILURE_EVT: | |
325 | case LINK_FAILOVER_BEGIN_EVT: | |
326 | case LINK_ESTABLISH_EVT: | |
327 | case LINK_FAILOVER_END_EVT: | |
328 | case LINK_SYNCH_BEGIN_EVT: | |
329 | case LINK_SYNCH_END_EVT: | |
330 | default: | |
331 | goto illegal_evt; | |
332 | } | |
333 | break; | |
334 | case LINK_RESET: | |
335 | switch (evt) { | |
336 | case LINK_PEER_RESET_EVT: | |
337 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 338 | break; |
662921cd JPM |
339 | case LINK_FAILOVER_BEGIN_EVT: |
340 | l->state = LINK_FAILINGOVER; | |
341 | case LINK_FAILURE_EVT: | |
342 | case LINK_RESET_EVT: | |
343 | case LINK_ESTABLISH_EVT: | |
344 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 345 | break; |
662921cd JPM |
346 | case LINK_SYNCH_BEGIN_EVT: |
347 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 348 | default: |
662921cd | 349 | goto illegal_evt; |
6ab30f9c JPM |
350 | } |
351 | break; | |
662921cd | 352 | case LINK_PEER_RESET: |
6ab30f9c | 353 | switch (evt) { |
662921cd JPM |
354 | case LINK_RESET_EVT: |
355 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 356 | break; |
662921cd JPM |
357 | case LINK_PEER_RESET_EVT: |
358 | case LINK_ESTABLISH_EVT: | |
359 | case LINK_FAILURE_EVT: | |
6ab30f9c | 360 | break; |
662921cd JPM |
361 | case LINK_SYNCH_BEGIN_EVT: |
362 | case LINK_SYNCH_END_EVT: | |
363 | case LINK_FAILOVER_BEGIN_EVT: | |
364 | case LINK_FAILOVER_END_EVT: | |
365 | default: | |
366 | goto illegal_evt; | |
367 | } | |
368 | break; | |
369 | case LINK_FAILINGOVER: | |
370 | switch (evt) { | |
371 | case LINK_FAILOVER_END_EVT: | |
372 | l->state = LINK_RESET; | |
6ab30f9c | 373 | break; |
662921cd JPM |
374 | case LINK_PEER_RESET_EVT: |
375 | case LINK_RESET_EVT: | |
376 | case LINK_ESTABLISH_EVT: | |
377 | case LINK_FAILURE_EVT: | |
378 | break; | |
379 | case LINK_FAILOVER_BEGIN_EVT: | |
380 | case LINK_SYNCH_BEGIN_EVT: | |
381 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 382 | default: |
662921cd | 383 | goto illegal_evt; |
6ab30f9c JPM |
384 | } |
385 | break; | |
662921cd | 386 | case LINK_ESTABLISHING: |
6ab30f9c | 387 | switch (evt) { |
662921cd JPM |
388 | case LINK_ESTABLISH_EVT: |
389 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 390 | break; |
662921cd JPM |
391 | case LINK_FAILOVER_BEGIN_EVT: |
392 | l->state = LINK_FAILINGOVER; | |
393 | break; | |
662921cd | 394 | case LINK_RESET_EVT: |
73f646ce JPM |
395 | l->state = LINK_RESET; |
396 | break; | |
662921cd | 397 | case LINK_FAILURE_EVT: |
73f646ce | 398 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
399 | case LINK_SYNCH_BEGIN_EVT: |
400 | case LINK_FAILOVER_END_EVT: | |
401 | break; | |
402 | case LINK_SYNCH_END_EVT: | |
403 | default: | |
404 | goto illegal_evt; | |
405 | } | |
406 | break; | |
407 | case LINK_ESTABLISHED: | |
408 | switch (evt) { | |
409 | case LINK_PEER_RESET_EVT: | |
410 | l->state = LINK_PEER_RESET; | |
411 | rc |= TIPC_LINK_DOWN_EVT; | |
412 | break; | |
413 | case LINK_FAILURE_EVT: | |
414 | l->state = LINK_RESETTING; | |
415 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 416 | break; |
662921cd JPM |
417 | case LINK_RESET_EVT: |
418 | l->state = LINK_RESET; | |
6ab30f9c | 419 | break; |
662921cd | 420 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 421 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 422 | break; |
662921cd JPM |
423 | case LINK_SYNCH_BEGIN_EVT: |
424 | l->state = LINK_SYNCHING; | |
425 | break; | |
662921cd JPM |
426 | case LINK_FAILOVER_BEGIN_EVT: |
427 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 428 | default: |
662921cd | 429 | goto illegal_evt; |
6ab30f9c JPM |
430 | } |
431 | break; | |
662921cd | 432 | case LINK_SYNCHING: |
6ab30f9c | 433 | switch (evt) { |
662921cd JPM |
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 JPM |
445 | case LINK_ESTABLISH_EVT: |
446 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 447 | break; |
662921cd JPM |
448 | case LINK_SYNCH_END_EVT: |
449 | l->state = LINK_ESTABLISHED; | |
450 | break; | |
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; | |
457 | default: | |
662921cd | 458 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 459 | } |
662921cd JPM |
460 | return rc; |
461 | illegal_evt: | |
462 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
463 | evt, l->state, l->name); | |
6ab30f9c JPM |
464 | return rc; |
465 | } | |
466 | ||
333ef69e JPM |
467 | /* link_profile_stats - update statistical profiling of traffic |
468 | */ | |
469 | static void link_profile_stats(struct tipc_link *l) | |
470 | { | |
471 | struct sk_buff *skb; | |
472 | struct tipc_msg *msg; | |
473 | int length; | |
474 | ||
475 | /* Update counters used in statistical profiling of send traffic */ | |
476 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
477 | l->stats.queue_sz_counts++; | |
478 | ||
479 | skb = skb_peek(&l->transmq); | |
480 | if (!skb) | |
481 | return; | |
482 | msg = buf_msg(skb); | |
483 | length = msg_size(msg); | |
484 | ||
485 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
486 | if (msg_type(msg) != FIRST_FRAGMENT) | |
487 | return; | |
488 | length = msg_size(msg_get_wrapped(msg)); | |
489 | } | |
490 | l->stats.msg_lengths_total += length; | |
491 | l->stats.msg_length_counts++; | |
492 | if (length <= 64) | |
493 | l->stats.msg_length_profile[0]++; | |
494 | else if (length <= 256) | |
495 | l->stats.msg_length_profile[1]++; | |
496 | else if (length <= 1024) | |
497 | l->stats.msg_length_profile[2]++; | |
498 | else if (length <= 4096) | |
499 | l->stats.msg_length_profile[3]++; | |
500 | else if (length <= 16384) | |
501 | l->stats.msg_length_profile[4]++; | |
502 | else if (length <= 32768) | |
503 | l->stats.msg_length_profile[5]++; | |
504 | else | |
505 | l->stats.msg_length_profile[6]++; | |
506 | } | |
507 | ||
508 | /* tipc_link_timeout - perform periodic task as instructed from node timeout | |
509 | */ | |
510 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
511 | { | |
512 | int rc = 0; | |
5045f7b9 JPM |
513 | int mtyp = STATE_MSG; |
514 | bool xmit = false; | |
515 | bool prb = false; | |
333ef69e JPM |
516 | |
517 | link_profile_stats(l); | |
5045f7b9 | 518 | |
662921cd JPM |
519 | switch (l->state) { |
520 | case LINK_ESTABLISHED: | |
521 | case LINK_SYNCHING: | |
5045f7b9 JPM |
522 | if (!l->silent_intv_cnt) { |
523 | if (tipc_bclink_acks_missing(l->owner)) | |
524 | xmit = true; | |
525 | } else if (l->silent_intv_cnt <= l->abort_limit) { | |
526 | xmit = true; | |
527 | prb = true; | |
528 | } else { | |
662921cd | 529 | rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
5045f7b9 JPM |
530 | } |
531 | l->silent_intv_cnt++; | |
662921cd JPM |
532 | break; |
533 | case LINK_RESET: | |
5045f7b9 JPM |
534 | xmit = true; |
535 | mtyp = RESET_MSG; | |
662921cd JPM |
536 | break; |
537 | case LINK_ESTABLISHING: | |
5045f7b9 JPM |
538 | xmit = true; |
539 | mtyp = ACTIVATE_MSG; | |
662921cd | 540 | break; |
662921cd | 541 | case LINK_PEER_RESET: |
598411d7 | 542 | case LINK_RESETTING: |
662921cd JPM |
543 | case LINK_FAILINGOVER: |
544 | break; | |
545 | default: | |
546 | break; | |
5045f7b9 | 547 | } |
662921cd | 548 | |
5045f7b9 JPM |
549 | if (xmit) |
550 | tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq); | |
551 | ||
333ef69e JPM |
552 | return rc; |
553 | } | |
554 | ||
b97bf3fd | 555 | /** |
3127a020 | 556 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 557 | * @link: congested link |
3127a020 | 558 | * @list: message that was attempted sent |
50100a5e | 559 | * Create pseudo msg to send back to user when congestion abates |
22d85c79 | 560 | * Does not consume buffer list |
b97bf3fd | 561 | */ |
3127a020 | 562 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 563 | { |
3127a020 JPM |
564 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
565 | int imp = msg_importance(msg); | |
566 | u32 oport = msg_origport(msg); | |
567 | u32 addr = link_own_addr(link); | |
568 | struct sk_buff *skb; | |
569 | ||
570 | /* This really cannot happen... */ | |
571 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
572 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
22d85c79 | 573 | return -ENOBUFS; |
3127a020 JPM |
574 | } |
575 | /* Non-blocking sender: */ | |
576 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
577 | return -ELINKCONG; | |
578 | ||
579 | /* Create and schedule wakeup pseudo message */ | |
580 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
581 | addr, addr, oport, 0, 0); | |
582 | if (!skb) | |
22d85c79 | 583 | return -ENOBUFS; |
3127a020 JPM |
584 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); |
585 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
586 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 587 | link->stats.link_congs++; |
3127a020 | 588 | return -ELINKCONG; |
b97bf3fd PL |
589 | } |
590 | ||
50100a5e JPM |
591 | /** |
592 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
593 | * @link: congested link | |
594 | * Move a number of waiting users, as permitted by available space in | |
595 | * the send queue, from link wait queue to node wait queue for wakeup | |
596 | */ | |
1f66d161 | 597 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 598 | { |
1f66d161 JPM |
599 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
600 | int imp, lim; | |
58d78b32 | 601 | struct sk_buff *skb, *tmp; |
50100a5e | 602 | |
1f66d161 JPM |
603 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
604 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
605 | lim = l->window + l->backlog[imp].limit; | |
606 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
607 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 608 | break; |
1f66d161 | 609 | skb_unlink(skb, &l->wakeupq); |
d39bbd44 | 610 | skb_queue_tail(l->inputq, skb); |
b97bf3fd | 611 | } |
b97bf3fd PL |
612 | } |
613 | ||
b97bf3fd | 614 | /** |
4323add6 | 615 | * tipc_link_reset_fragments - purge link's inbound message fragments queue |
b97bf3fd PL |
616 | * @l_ptr: pointer to link |
617 | */ | |
a18c4bc3 | 618 | void tipc_link_reset_fragments(struct tipc_link *l_ptr) |
b97bf3fd | 619 | { |
37e22164 JPM |
620 | kfree_skb(l_ptr->reasm_buf); |
621 | l_ptr->reasm_buf = NULL; | |
b97bf3fd PL |
622 | } |
623 | ||
7d967b67 | 624 | void tipc_link_purge_backlog(struct tipc_link *l) |
1f66d161 JPM |
625 | { |
626 | __skb_queue_purge(&l->backlogq); | |
627 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
628 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
629 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
630 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
631 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
632 | } | |
633 | ||
c4307285 | 634 | /** |
581465fa | 635 | * tipc_link_purge_queues - purge all pkt queues associated with link |
b97bf3fd PL |
636 | * @l_ptr: pointer to link |
637 | */ | |
581465fa | 638 | void tipc_link_purge_queues(struct tipc_link *l_ptr) |
b97bf3fd | 639 | { |
05dcc5aa JPM |
640 | __skb_queue_purge(&l_ptr->deferdq); |
641 | __skb_queue_purge(&l_ptr->transmq); | |
1f66d161 | 642 | tipc_link_purge_backlog(l_ptr); |
4323add6 | 643 | tipc_link_reset_fragments(l_ptr); |
b97bf3fd PL |
644 | } |
645 | ||
6e498158 | 646 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 647 | { |
a686e685 | 648 | /* Link is down, accept any session */ |
6e498158 | 649 | l->peer_session = WILDCARD_SESSION; |
b97bf3fd | 650 | |
6e498158 JPM |
651 | /* If peer is up, it only accepts an incremented session number */ |
652 | msg_set_session(l->pmsg, msg_session(l->pmsg) + 1); | |
b97bf3fd | 653 | |
6e498158 JPM |
654 | /* Prepare for renewed mtu size negotiation */ |
655 | l->mtu = l->advertised_mtu; | |
b97bf3fd | 656 | |
23d8335d | 657 | /* Clean up all queues: */ |
6e498158 JPM |
658 | __skb_queue_purge(&l->transmq); |
659 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 660 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
6e498158 JPM |
661 | |
662 | tipc_link_purge_backlog(l); | |
663 | kfree_skb(l->reasm_buf); | |
664 | kfree_skb(l->failover_reasm_skb); | |
665 | l->reasm_buf = NULL; | |
666 | l->failover_reasm_skb = NULL; | |
667 | l->rcv_unacked = 0; | |
668 | l->snd_nxt = 1; | |
669 | l->rcv_nxt = 1; | |
c1ab3f1d | 670 | l->acked = 0; |
6e498158 JPM |
671 | l->silent_intv_cnt = 0; |
672 | l->stats.recv_info = 0; | |
673 | l->stale_count = 0; | |
674 | link_reset_statistics(l); | |
b97bf3fd PL |
675 | } |
676 | ||
4f1688b2 | 677 | /** |
9fbfb8b1 | 678 | * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked |
4f1688b2 | 679 | * @link: link to use |
a6ca1094 YX |
680 | * @list: chain of buffers containing message |
681 | * | |
22d85c79 | 682 | * Consumes the buffer chain, except when returning an error code, |
3127a020 JPM |
683 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
684 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
4f1688b2 | 685 | */ |
7f9f95d9 YX |
686 | int __tipc_link_xmit(struct net *net, struct tipc_link *link, |
687 | struct sk_buff_head *list) | |
4f1688b2 | 688 | { |
a6ca1094 | 689 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
05dcc5aa | 690 | unsigned int maxwin = link->window; |
f21e897e | 691 | unsigned int i, imp = msg_importance(msg); |
ed193ece | 692 | uint mtu = link->mtu; |
a97b9d3f JPM |
693 | u16 ack = mod(link->rcv_nxt - 1); |
694 | u16 seqno = link->snd_nxt; | |
e4bf4f76 | 695 | u16 bc_last_in = link->owner->bclink.last_in; |
440d8963 | 696 | struct tipc_media_addr *addr = link->media_addr; |
05dcc5aa JPM |
697 | struct sk_buff_head *transmq = &link->transmq; |
698 | struct sk_buff_head *backlogq = &link->backlogq; | |
dd3f9e70 | 699 | struct sk_buff *skb, *bskb; |
4f1688b2 | 700 | |
f21e897e JPM |
701 | /* Match msg importance against this and all higher backlog limits: */ |
702 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
703 | if (unlikely(link->backlog[i].len >= link->backlog[i].limit)) | |
704 | return link_schedule_user(link, list); | |
705 | } | |
22d85c79 | 706 | if (unlikely(msg_size(msg) > mtu)) |
4f1688b2 | 707 | return -EMSGSIZE; |
22d85c79 | 708 | |
05dcc5aa | 709 | /* Prepare each packet for sending, and add to relevant queue: */ |
dd3f9e70 JPM |
710 | while (skb_queue_len(list)) { |
711 | skb = skb_peek(list); | |
58dc55f2 | 712 | msg = buf_msg(skb); |
05dcc5aa JPM |
713 | msg_set_seqno(msg, seqno); |
714 | msg_set_ack(msg, ack); | |
4f1688b2 JPM |
715 | msg_set_bcast_ack(msg, bc_last_in); |
716 | ||
05dcc5aa | 717 | if (likely(skb_queue_len(transmq) < maxwin)) { |
dd3f9e70 | 718 | __skb_dequeue(list); |
05dcc5aa JPM |
719 | __skb_queue_tail(transmq, skb); |
720 | tipc_bearer_send(net, link->bearer_id, skb, addr); | |
721 | link->rcv_unacked = 0; | |
722 | seqno++; | |
723 | continue; | |
724 | } | |
dd3f9e70 JPM |
725 | if (tipc_msg_bundle(skb_peek_tail(backlogq), msg, mtu)) { |
726 | kfree_skb(__skb_dequeue(list)); | |
4f1688b2 | 727 | link->stats.sent_bundled++; |
4f1688b2 | 728 | continue; |
05dcc5aa | 729 | } |
dd3f9e70 JPM |
730 | if (tipc_msg_make_bundle(&bskb, msg, mtu, link->addr)) { |
731 | kfree_skb(__skb_dequeue(list)); | |
732 | __skb_queue_tail(backlogq, bskb); | |
733 | link->backlog[msg_importance(buf_msg(bskb))].len++; | |
4f1688b2 JPM |
734 | link->stats.sent_bundled++; |
735 | link->stats.sent_bundles++; | |
dd3f9e70 | 736 | continue; |
4f1688b2 | 737 | } |
dd3f9e70 JPM |
738 | link->backlog[imp].len += skb_queue_len(list); |
739 | skb_queue_splice_tail_init(list, backlogq); | |
4f1688b2 | 740 | } |
a97b9d3f | 741 | link->snd_nxt = seqno; |
4f1688b2 JPM |
742 | return 0; |
743 | } | |
744 | ||
af9b028e JPM |
745 | /** |
746 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
747 | * @link: link to use | |
748 | * @list: chain of buffers containing message | |
749 | * @xmitq: returned list of packets to be sent by caller | |
750 | * | |
751 | * Consumes the buffer chain, except when returning -ELINKCONG, | |
752 | * since the caller then may want to make more send attempts. | |
753 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
754 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
755 | */ | |
756 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
757 | struct sk_buff_head *xmitq) | |
758 | { | |
759 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
760 | unsigned int maxwin = l->window; | |
761 | unsigned int i, imp = msg_importance(hdr); | |
762 | unsigned int mtu = l->mtu; | |
763 | u16 ack = l->rcv_nxt - 1; | |
764 | u16 seqno = l->snd_nxt; | |
765 | u16 bc_last_in = l->owner->bclink.last_in; | |
766 | struct sk_buff_head *transmq = &l->transmq; | |
767 | struct sk_buff_head *backlogq = &l->backlogq; | |
768 | struct sk_buff *skb, *_skb, *bskb; | |
769 | ||
770 | /* Match msg importance against this and all higher backlog limits: */ | |
771 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
772 | if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) | |
773 | return link_schedule_user(l, list); | |
774 | } | |
775 | if (unlikely(msg_size(hdr) > mtu)) | |
776 | return -EMSGSIZE; | |
777 | ||
778 | /* Prepare each packet for sending, and add to relevant queue: */ | |
779 | while (skb_queue_len(list)) { | |
780 | skb = skb_peek(list); | |
781 | hdr = buf_msg(skb); | |
782 | msg_set_seqno(hdr, seqno); | |
783 | msg_set_ack(hdr, ack); | |
784 | msg_set_bcast_ack(hdr, bc_last_in); | |
785 | ||
786 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
787 | _skb = skb_clone(skb, GFP_ATOMIC); | |
788 | if (!_skb) | |
789 | return -ENOBUFS; | |
790 | __skb_dequeue(list); | |
791 | __skb_queue_tail(transmq, skb); | |
792 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 793 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e JPM |
794 | l->rcv_unacked = 0; |
795 | seqno++; | |
796 | continue; | |
797 | } | |
798 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
799 | kfree_skb(__skb_dequeue(list)); | |
800 | l->stats.sent_bundled++; | |
801 | continue; | |
802 | } | |
803 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
804 | kfree_skb(__skb_dequeue(list)); | |
805 | __skb_queue_tail(backlogq, bskb); | |
806 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
807 | l->stats.sent_bundled++; | |
808 | l->stats.sent_bundles++; | |
809 | continue; | |
810 | } | |
811 | l->backlog[imp].len += skb_queue_len(list); | |
812 | skb_queue_splice_tail_init(list, backlogq); | |
813 | } | |
814 | l->snd_nxt = seqno; | |
815 | return 0; | |
816 | } | |
817 | ||
c64f7a6a | 818 | /* |
247f0f3c | 819 | * tipc_link_sync_rcv - synchronize broadcast link endpoints. |
c64f7a6a JM |
820 | * Receive the sequence number where we should start receiving and |
821 | * acking broadcast packets from a newly added peer node, and open | |
822 | * up for reception of such packets. | |
823 | * | |
824 | * Called with node locked | |
825 | */ | |
247f0f3c | 826 | static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf) |
c64f7a6a JM |
827 | { |
828 | struct tipc_msg *msg = buf_msg(buf); | |
829 | ||
830 | n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg); | |
831 | n->bclink.recv_permitted = true; | |
832 | kfree_skb(buf); | |
833 | } | |
834 | ||
c4307285 | 835 | /* |
47b4c9a8 YX |
836 | * tipc_link_push_packets - push unsent packets to bearer |
837 | * | |
838 | * Push out the unsent messages of a link where congestion | |
839 | * has abated. Node is locked. | |
840 | * | |
841 | * Called with node locked | |
b97bf3fd | 842 | */ |
05dcc5aa | 843 | void tipc_link_push_packets(struct tipc_link *link) |
b97bf3fd | 844 | { |
05dcc5aa | 845 | struct sk_buff *skb; |
47b4c9a8 | 846 | struct tipc_msg *msg; |
dd3f9e70 | 847 | u16 seqno = link->snd_nxt; |
a97b9d3f | 848 | u16 ack = mod(link->rcv_nxt - 1); |
b97bf3fd | 849 | |
05dcc5aa JPM |
850 | while (skb_queue_len(&link->transmq) < link->window) { |
851 | skb = __skb_dequeue(&link->backlogq); | |
852 | if (!skb) | |
47b4c9a8 | 853 | break; |
c1ab3f1d | 854 | TIPC_SKB_CB(skb)->ackers = link->ackers; |
05dcc5aa | 855 | msg = buf_msg(skb); |
1f66d161 | 856 | link->backlog[msg_importance(msg)].len--; |
05dcc5aa | 857 | msg_set_ack(msg, ack); |
dd3f9e70 JPM |
858 | msg_set_seqno(msg, seqno); |
859 | seqno = mod(seqno + 1); | |
05dcc5aa JPM |
860 | msg_set_bcast_ack(msg, link->owner->bclink.last_in); |
861 | link->rcv_unacked = 0; | |
862 | __skb_queue_tail(&link->transmq, skb); | |
863 | tipc_bearer_send(link->owner->net, link->bearer_id, | |
440d8963 | 864 | skb, link->media_addr); |
b97bf3fd | 865 | } |
dd3f9e70 | 866 | link->snd_nxt = seqno; |
b97bf3fd PL |
867 | } |
868 | ||
d999297c JPM |
869 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
870 | { | |
871 | struct sk_buff *skb, *_skb; | |
872 | struct tipc_msg *hdr; | |
873 | u16 seqno = l->snd_nxt; | |
874 | u16 ack = l->rcv_nxt - 1; | |
875 | ||
876 | while (skb_queue_len(&l->transmq) < l->window) { | |
877 | skb = skb_peek(&l->backlogq); | |
878 | if (!skb) | |
879 | break; | |
880 | _skb = skb_clone(skb, GFP_ATOMIC); | |
881 | if (!_skb) | |
882 | break; | |
883 | __skb_dequeue(&l->backlogq); | |
884 | hdr = buf_msg(skb); | |
885 | l->backlog[msg_importance(hdr)].len--; | |
886 | __skb_queue_tail(&l->transmq, skb); | |
887 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 888 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c JPM |
889 | msg_set_ack(hdr, ack); |
890 | msg_set_seqno(hdr, seqno); | |
891 | msg_set_bcast_ack(hdr, l->owner->bclink.last_in); | |
892 | l->rcv_unacked = 0; | |
893 | seqno++; | |
894 | } | |
895 | l->snd_nxt = seqno; | |
896 | } | |
897 | ||
a18c4bc3 | 898 | static void link_retransmit_failure(struct tipc_link *l_ptr, |
ae8509c4 | 899 | struct sk_buff *buf) |
d356eeba AS |
900 | { |
901 | struct tipc_msg *msg = buf_msg(buf); | |
1da46568 | 902 | struct net *net = l_ptr->owner->net; |
d356eeba | 903 | |
2cf8aa19 | 904 | pr_warn("Retransmission failure on link <%s>\n", l_ptr->name); |
d356eeba AS |
905 | |
906 | if (l_ptr->addr) { | |
d356eeba | 907 | /* Handle failure on standard link */ |
1a20cc25 JPM |
908 | link_print(l_ptr, "Resetting link "); |
909 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
910 | msg_user(msg), msg_type(msg), msg_size(msg), | |
911 | msg_errcode(msg)); | |
912 | pr_info("sqno %u, prev: %x, src: %x\n", | |
913 | msg_seqno(msg), msg_prevnode(msg), msg_orignode(msg)); | |
d356eeba | 914 | } else { |
d356eeba | 915 | /* Handle failure on broadcast link */ |
6c00055a | 916 | struct tipc_node *n_ptr; |
d356eeba AS |
917 | char addr_string[16]; |
918 | ||
2cf8aa19 | 919 | pr_info("Msg seq number: %u, ", msg_seqno(msg)); |
2f566124 | 920 | pr_cont("Outstanding acks: %u\n", TIPC_SKB_CB(buf)->ackers); |
617dbeaa | 921 | |
1da46568 | 922 | n_ptr = tipc_bclink_retransmit_to(net); |
d356eeba | 923 | |
c68ca7b7 | 924 | tipc_addr_string_fill(addr_string, n_ptr->addr); |
2cf8aa19 | 925 | pr_info("Broadcast link info for %s\n", addr_string); |
389dd9bc YX |
926 | pr_info("Reception permitted: %d, Acked: %u\n", |
927 | n_ptr->bclink.recv_permitted, | |
2cf8aa19 EH |
928 | n_ptr->bclink.acked); |
929 | pr_info("Last in: %u, Oos state: %u, Last sent: %u\n", | |
930 | n_ptr->bclink.last_in, | |
931 | n_ptr->bclink.oos_state, | |
932 | n_ptr->bclink.last_sent); | |
d356eeba | 933 | |
b952b2be | 934 | n_ptr->action_flags |= TIPC_BCAST_RESET; |
d356eeba AS |
935 | l_ptr->stale_count = 0; |
936 | } | |
937 | } | |
938 | ||
58dc55f2 | 939 | void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb, |
4323add6 | 940 | u32 retransmits) |
b97bf3fd PL |
941 | { |
942 | struct tipc_msg *msg; | |
943 | ||
58dc55f2 | 944 | if (!skb) |
d356eeba AS |
945 | return; |
946 | ||
58dc55f2 | 947 | msg = buf_msg(skb); |
c4307285 | 948 | |
512137ee | 949 | /* Detect repeated retransmit failures */ |
a97b9d3f | 950 | if (l_ptr->last_retransm == msg_seqno(msg)) { |
512137ee | 951 | if (++l_ptr->stale_count > 100) { |
58dc55f2 | 952 | link_retransmit_failure(l_ptr, skb); |
512137ee | 953 | return; |
d356eeba AS |
954 | } |
955 | } else { | |
a97b9d3f | 956 | l_ptr->last_retransm = msg_seqno(msg); |
512137ee | 957 | l_ptr->stale_count = 1; |
b97bf3fd | 958 | } |
d356eeba | 959 | |
05dcc5aa JPM |
960 | skb_queue_walk_from(&l_ptr->transmq, skb) { |
961 | if (!retransmits) | |
58dc55f2 YX |
962 | break; |
963 | msg = buf_msg(skb); | |
a97b9d3f | 964 | msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1)); |
c4307285 | 965 | msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in); |
7f9f95d9 | 966 | tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb, |
440d8963 | 967 | l_ptr->media_addr); |
3c294cb3 YX |
968 | retransmits--; |
969 | l_ptr->stats.retransmitted++; | |
b97bf3fd | 970 | } |
b97bf3fd PL |
971 | } |
972 | ||
c1ab3f1d JPM |
973 | int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to, |
974 | struct sk_buff_head *xmitq) | |
d999297c JPM |
975 | { |
976 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
977 | struct tipc_msg *hdr; | |
c1ab3f1d JPM |
978 | u16 ack = l->rcv_nxt - 1; |
979 | u16 bc_ack = l->owner->bclink.last_in; | |
d999297c JPM |
980 | |
981 | if (!skb) | |
982 | return 0; | |
983 | ||
984 | /* Detect repeated retransmit failures on same packet */ | |
985 | if (likely(l->last_retransm != buf_seqno(skb))) { | |
986 | l->last_retransm = buf_seqno(skb); | |
987 | l->stale_count = 1; | |
988 | } else if (++l->stale_count > 100) { | |
989 | link_retransmit_failure(l, skb); | |
662921cd | 990 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c | 991 | } |
c1ab3f1d JPM |
992 | |
993 | /* Move forward to where retransmission should start */ | |
d999297c | 994 | skb_queue_walk(&l->transmq, skb) { |
c1ab3f1d JPM |
995 | if (!less(buf_seqno(skb), from)) |
996 | break; | |
997 | } | |
998 | ||
999 | skb_queue_walk_from(&l->transmq, skb) { | |
1000 | if (more(buf_seqno(skb), to)) | |
1001 | break; | |
d999297c JPM |
1002 | hdr = buf_msg(skb); |
1003 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); | |
1004 | if (!_skb) | |
1005 | return 0; | |
1006 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
1007 | msg_set_ack(hdr, ack); |
1008 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
1009 | _skb->priority = TC_PRIO_CONTROL; |
1010 | __skb_queue_tail(xmitq, _skb); | |
d999297c JPM |
1011 | l->stats.retransmitted++; |
1012 | } | |
1013 | return 0; | |
1014 | } | |
1015 | ||
c637c103 | 1016 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1017 | * |
c637c103 | 1018 | * Consumes buffer if message is of right type |
7ae934be EH |
1019 | * Node lock must be held |
1020 | */ | |
9073fb8b JPM |
1021 | static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb, |
1022 | struct sk_buff_head *inputq) | |
7ae934be | 1023 | { |
c637c103 | 1024 | struct tipc_node *node = link->owner; |
7ae934be | 1025 | |
9073fb8b | 1026 | switch (msg_user(buf_msg(skb))) { |
c637c103 JPM |
1027 | case TIPC_LOW_IMPORTANCE: |
1028 | case TIPC_MEDIUM_IMPORTANCE: | |
1029 | case TIPC_HIGH_IMPORTANCE: | |
1030 | case TIPC_CRITICAL_IMPORTANCE: | |
1031 | case CONN_MANAGER: | |
9945e804 | 1032 | skb_queue_tail(inputq, skb); |
c637c103 | 1033 | return true; |
7ae934be | 1034 | case NAME_DISTRIBUTOR: |
c637c103 | 1035 | node->bclink.recv_permitted = true; |
d39bbd44 | 1036 | skb_queue_tail(link->namedq, skb); |
c637c103 JPM |
1037 | return true; |
1038 | case MSG_BUNDLER: | |
dff29b1a | 1039 | case TUNNEL_PROTOCOL: |
c637c103 | 1040 | case MSG_FRAGMENTER: |
7ae934be | 1041 | case BCAST_PROTOCOL: |
c637c103 | 1042 | return false; |
7ae934be | 1043 | default: |
c637c103 JPM |
1044 | pr_warn("Dropping received illegal msg type\n"); |
1045 | kfree_skb(skb); | |
1046 | return false; | |
1047 | }; | |
7ae934be | 1048 | } |
c637c103 JPM |
1049 | |
1050 | /* tipc_link_input - process packet that has passed link protocol check | |
1051 | * | |
1052 | * Consumes buffer | |
7ae934be | 1053 | */ |
9073fb8b JPM |
1054 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
1055 | struct sk_buff_head *inputq) | |
7ae934be | 1056 | { |
6e498158 JPM |
1057 | struct tipc_node *node = l->owner; |
1058 | struct tipc_msg *hdr = buf_msg(skb); | |
1059 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 1060 | struct sk_buff *iskb; |
9945e804 | 1061 | struct sk_buff_head tmpq; |
6e498158 | 1062 | int usr = msg_user(hdr); |
6144a996 | 1063 | int rc = 0; |
6e498158 JPM |
1064 | int pos = 0; |
1065 | int ipos = 0; | |
c637c103 | 1066 | |
6e498158 JPM |
1067 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
1068 | if (msg_type(hdr) == SYNCH_MSG) { | |
1069 | __skb_queue_purge(&l->deferdq); | |
1070 | goto drop; | |
8b4ed863 | 1071 | } |
6e498158 JPM |
1072 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
1073 | return rc; | |
1074 | kfree_skb(skb); | |
1075 | skb = iskb; | |
1076 | hdr = buf_msg(skb); | |
1077 | if (less(msg_seqno(hdr), l->drop_point)) | |
1078 | goto drop; | |
9073fb8b | 1079 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
1080 | return rc; |
1081 | usr = msg_user(hdr); | |
1082 | reasm_skb = &l->failover_reasm_skb; | |
1083 | } | |
c637c103 | 1084 | |
6e498158 | 1085 | if (usr == MSG_BUNDLER) { |
9945e804 | 1086 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1087 | l->stats.recv_bundles++; |
1088 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1089 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1090 | tipc_data_input(l, iskb, &tmpq); |
1091 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1092 | return 0; |
6e498158 JPM |
1093 | } else if (usr == MSG_FRAGMENTER) { |
1094 | l->stats.recv_fragments++; | |
1095 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1096 | l->stats.recv_fragmented++; | |
9073fb8b | 1097 | tipc_data_input(l, skb, inputq); |
6e498158 | 1098 | } else if (!*reasm_skb) { |
662921cd | 1099 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1100 | } |
662921cd | 1101 | return 0; |
6e498158 | 1102 | } else if (usr == BCAST_PROTOCOL) { |
c637c103 | 1103 | tipc_link_sync_rcv(node, skb); |
662921cd | 1104 | return 0; |
6e498158 JPM |
1105 | } |
1106 | drop: | |
1107 | kfree_skb(skb); | |
662921cd | 1108 | return 0; |
7ae934be EH |
1109 | } |
1110 | ||
d999297c JPM |
1111 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1112 | { | |
1113 | bool released = false; | |
1114 | struct sk_buff *skb, *tmp; | |
1115 | ||
1116 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1117 | if (more(buf_seqno(skb), acked)) | |
1118 | break; | |
1119 | __skb_unlink(skb, &l->transmq); | |
1120 | kfree_skb(skb); | |
1121 | released = true; | |
1122 | } | |
1123 | return released; | |
1124 | } | |
1125 | ||
f9aa358a JPM |
1126 | /* tipc_link_build_ack_msg: prepare link acknowledge message for transmission |
1127 | */ | |
1128 | void tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1129 | { | |
1130 | l->rcv_unacked = 0; | |
1131 | l->stats.sent_acks++; | |
1132 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
1133 | } | |
1134 | ||
282b3a05 JPM |
1135 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1136 | */ | |
1137 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1138 | { | |
1139 | int mtyp = RESET_MSG; | |
1140 | ||
1141 | if (l->state == LINK_ESTABLISHING) | |
1142 | mtyp = ACTIVATE_MSG; | |
1143 | ||
1144 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq); | |
1145 | } | |
1146 | ||
f9aa358a JPM |
1147 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
1148 | */ | |
1149 | static void tipc_link_build_nack_msg(struct tipc_link *l, | |
1150 | struct sk_buff_head *xmitq) | |
1151 | { | |
1152 | u32 def_cnt = ++l->stats.deferred_recv; | |
1153 | ||
1154 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) | |
1155 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
1156 | } | |
1157 | ||
d999297c | 1158 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1159 | * @l: the link that should handle the message |
d999297c JPM |
1160 | * @skb: TIPC packet |
1161 | * @xmitq: queue to place packets to be sent after this call | |
1162 | */ | |
1163 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1164 | struct sk_buff_head *xmitq) | |
1165 | { | |
f9aa358a | 1166 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1167 | struct tipc_msg *hdr; |
81204c49 | 1168 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1169 | int rc = 0; |
1170 | ||
f9aa358a | 1171 | do { |
d999297c | 1172 | hdr = buf_msg(skb); |
f9aa358a JPM |
1173 | seqno = msg_seqno(hdr); |
1174 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1175 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1176 | |
1177 | /* Verify and update link state */ | |
f9aa358a JPM |
1178 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1179 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1180 | |
662921cd | 1181 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1182 | if (l->state == LINK_ESTABLISHING) |
1183 | rc = TIPC_LINK_UP_EVT; | |
1184 | goto drop; | |
d999297c JPM |
1185 | } |
1186 | ||
f9aa358a | 1187 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1188 | l->silent_intv_cnt = 0; |
1189 | ||
81204c49 JPM |
1190 | /* Drop if outside receive window */ |
1191 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1192 | l->stats.duplicates++; | |
1193 | goto drop; | |
1194 | } | |
1195 | ||
d999297c JPM |
1196 | /* Forward queues and wake up waiting users */ |
1197 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1198 | tipc_link_advance_backlog(l, xmitq); | |
1199 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1200 | link_prepare_wakeup(l); | |
1201 | } | |
1202 | ||
81204c49 JPM |
1203 | /* Defer delivery if sequence gap */ |
1204 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1205 | __tipc_skb_queue_sorted(defq, seqno, skb); |
f9aa358a JPM |
1206 | tipc_link_build_nack_msg(l, xmitq); |
1207 | break; | |
d999297c JPM |
1208 | } |
1209 | ||
81204c49 | 1210 | /* Deliver packet */ |
d999297c JPM |
1211 | l->rcv_nxt++; |
1212 | l->stats.recv_info++; | |
f9aa358a | 1213 | if (!tipc_data_input(l, skb, l->inputq)) |
9945e804 | 1214 | rc = tipc_link_input(l, skb, l->inputq); |
81204c49 | 1215 | if (unlikely(rc)) |
f9aa358a | 1216 | break; |
f9aa358a JPM |
1217 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
1218 | tipc_link_build_ack_msg(l, xmitq); | |
1219 | ||
1220 | } while ((skb = __skb_dequeue(defq))); | |
1221 | ||
1222 | return rc; | |
1223 | drop: | |
1224 | kfree_skb(skb); | |
d999297c JPM |
1225 | return rc; |
1226 | } | |
1227 | ||
2c53040f | 1228 | /** |
8809b255 AS |
1229 | * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue |
1230 | * | |
1231 | * Returns increase in queue length (i.e. 0 or 1) | |
b97bf3fd | 1232 | */ |
bc6fecd4 | 1233 | u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) |
b97bf3fd | 1234 | { |
bc6fecd4 | 1235 | struct sk_buff *skb1; |
e4bf4f76 | 1236 | u16 seq_no = buf_seqno(skb); |
b97bf3fd PL |
1237 | |
1238 | /* Empty queue ? */ | |
bc6fecd4 YX |
1239 | if (skb_queue_empty(list)) { |
1240 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1241 | return 1; |
1242 | } | |
1243 | ||
1244 | /* Last ? */ | |
bc6fecd4 YX |
1245 | if (less(buf_seqno(skb_peek_tail(list)), seq_no)) { |
1246 | __skb_queue_tail(list, skb); | |
b97bf3fd PL |
1247 | return 1; |
1248 | } | |
1249 | ||
8809b255 | 1250 | /* Locate insertion point in queue, then insert; discard if duplicate */ |
bc6fecd4 | 1251 | skb_queue_walk(list, skb1) { |
e4bf4f76 | 1252 | u16 curr_seqno = buf_seqno(skb1); |
b97bf3fd | 1253 | |
8809b255 | 1254 | if (seq_no == curr_seqno) { |
bc6fecd4 | 1255 | kfree_skb(skb); |
8809b255 | 1256 | return 0; |
b97bf3fd | 1257 | } |
8809b255 AS |
1258 | |
1259 | if (less(seq_no, curr_seqno)) | |
b97bf3fd | 1260 | break; |
8809b255 | 1261 | } |
b97bf3fd | 1262 | |
bc6fecd4 | 1263 | __skb_queue_before(list, skb1, skb); |
8809b255 | 1264 | return 1; |
b97bf3fd PL |
1265 | } |
1266 | ||
b97bf3fd PL |
1267 | /* |
1268 | * Send protocol message to the other endpoint. | |
1269 | */ | |
426cc2b8 | 1270 | void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg, |
ed193ece | 1271 | u32 gap, u32 tolerance, u32 priority) |
b97bf3fd | 1272 | { |
426cc2b8 JPM |
1273 | struct sk_buff *skb = NULL; |
1274 | struct sk_buff_head xmitq; | |
b97bf3fd | 1275 | |
426cc2b8 JPM |
1276 | __skb_queue_head_init(&xmitq); |
1277 | tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap, | |
1278 | tolerance, priority, &xmitq); | |
1279 | skb = __skb_dequeue(&xmitq); | |
1280 | if (!skb) | |
b97bf3fd | 1281 | return; |
440d8963 | 1282 | tipc_bearer_send(l->owner->net, l->bearer_id, skb, l->media_addr); |
426cc2b8 JPM |
1283 | l->rcv_unacked = 0; |
1284 | kfree_skb(skb); | |
b97bf3fd PL |
1285 | } |
1286 | ||
426cc2b8 JPM |
1287 | /* tipc_link_build_proto_msg: prepare link protocol message for transmission |
1288 | */ | |
1289 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, | |
1290 | u16 rcvgap, int tolerance, int priority, | |
1291 | struct sk_buff_head *xmitq) | |
1292 | { | |
1293 | struct sk_buff *skb = NULL; | |
1294 | struct tipc_msg *hdr = l->pmsg; | |
1295 | u16 snd_nxt = l->snd_nxt; | |
1296 | u16 rcv_nxt = l->rcv_nxt; | |
1297 | u16 rcv_last = rcv_nxt - 1; | |
1298 | int node_up = l->owner->bclink.recv_permitted; | |
1299 | ||
1300 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1301 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1302 | return; |
1303 | ||
426cc2b8 JPM |
1304 | msg_set_type(hdr, mtyp); |
1305 | msg_set_net_plane(hdr, l->net_plane); | |
1306 | msg_set_bcast_ack(hdr, l->owner->bclink.last_in); | |
1307 | msg_set_last_bcast(hdr, tipc_bclink_get_last_sent(l->owner->net)); | |
1308 | msg_set_link_tolerance(hdr, tolerance); | |
1309 | msg_set_linkprio(hdr, priority); | |
1310 | msg_set_redundant_link(hdr, node_up); | |
1311 | msg_set_seq_gap(hdr, 0); | |
1312 | ||
1313 | /* Compatibility: created msg must not be in sequence with pkt flow */ | |
1314 | msg_set_seqno(hdr, snd_nxt + U16_MAX / 2); | |
1315 | ||
1316 | if (mtyp == STATE_MSG) { | |
1317 | if (!tipc_link_is_up(l)) | |
1318 | return; | |
1319 | msg_set_next_sent(hdr, snd_nxt); | |
1320 | ||
1321 | /* Override rcvgap if there are packets in deferred queue */ | |
1322 | if (!skb_queue_empty(&l->deferdq)) | |
1323 | rcvgap = buf_seqno(skb_peek(&l->deferdq)) - rcv_nxt; | |
1324 | if (rcvgap) { | |
1325 | msg_set_seq_gap(hdr, rcvgap); | |
1326 | l->stats.sent_nacks++; | |
1327 | } | |
1328 | msg_set_ack(hdr, rcv_last); | |
1329 | msg_set_probe(hdr, probe); | |
1330 | if (probe) | |
1331 | l->stats.sent_probes++; | |
1332 | l->stats.sent_states++; | |
1333 | } else { | |
1334 | /* RESET_MSG or ACTIVATE_MSG */ | |
1335 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
6e498158 | 1336 | msg_set_ack(hdr, l->rcv_nxt - 1); |
426cc2b8 JPM |
1337 | msg_set_next_sent(hdr, 1); |
1338 | } | |
1339 | skb = tipc_buf_acquire(msg_size(hdr)); | |
1340 | if (!skb) | |
1341 | return; | |
1342 | skb_copy_to_linear_data(skb, hdr, msg_size(hdr)); | |
1343 | skb->priority = TC_PRIO_CONTROL; | |
6e498158 | 1344 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1345 | } |
1346 | ||
6e498158 | 1347 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1348 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1349 | */ |
6e498158 JPM |
1350 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1351 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1352 | { |
6e498158 JPM |
1353 | struct sk_buff *skb, *tnlskb; |
1354 | struct tipc_msg *hdr, tnlhdr; | |
1355 | struct sk_buff_head *queue = &l->transmq; | |
1356 | struct sk_buff_head tmpxq, tnlq; | |
1357 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1358 | |
6e498158 | 1359 | if (!tnl) |
b97bf3fd PL |
1360 | return; |
1361 | ||
6e498158 JPM |
1362 | skb_queue_head_init(&tnlq); |
1363 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1364 | |
6e498158 JPM |
1365 | /* At least one packet required for safe algorithm => add dummy */ |
1366 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1367 | BASIC_H_SIZE, 0, l->addr, link_own_addr(l), | |
1368 | 0, 0, TIPC_ERR_NO_PORT); | |
1369 | if (!skb) { | |
1370 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1371 | return; |
1372 | } | |
6e498158 JPM |
1373 | skb_queue_tail(&tnlq, skb); |
1374 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1375 | __skb_queue_purge(&tmpxq); | |
1376 | ||
1377 | /* Initialize reusable tunnel packet header */ | |
1378 | tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL, | |
1379 | mtyp, INT_H_SIZE, l->addr); | |
1380 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1381 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1382 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1383 | tnl: | |
1384 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1385 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1386 | hdr = buf_msg(skb); |
1387 | if (queue == &l->backlogq) | |
1388 | msg_set_seqno(hdr, seqno++); | |
1389 | pktlen = msg_size(hdr); | |
1390 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
1391 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE); | |
1392 | if (!tnlskb) { | |
1393 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1394 | return; |
1395 | } | |
6e498158 JPM |
1396 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1397 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1398 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1399 | } |
6e498158 JPM |
1400 | if (queue != &l->backlogq) { |
1401 | queue = &l->backlogq; | |
1402 | goto tnl; | |
f006c9c7 | 1403 | } |
1dab3d5a | 1404 | |
6e498158 | 1405 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1406 | |
6e498158 JPM |
1407 | if (mtyp == FAILOVER_MSG) { |
1408 | tnl->drop_point = l->rcv_nxt; | |
1409 | tnl->failover_reasm_skb = l->reasm_buf; | |
1410 | l->reasm_buf = NULL; | |
2da71425 | 1411 | } |
b97bf3fd PL |
1412 | } |
1413 | ||
d999297c JPM |
1414 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1415 | * Note that network plane id propagates through the network, and may | |
1416 | * change at any time. The node with lowest numerical id determines | |
1417 | * network plane | |
1418 | */ | |
1419 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1420 | struct sk_buff_head *xmitq) | |
1421 | { | |
1422 | struct tipc_msg *hdr = buf_msg(skb); | |
1423 | u16 rcvgap = 0; | |
c1ab3f1d JPM |
1424 | u16 ack = msg_ack(hdr); |
1425 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1426 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1427 | u16 peers_tol = msg_link_tolerance(hdr); | |
1428 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1429 | u16 rcv_nxt = l->rcv_nxt; |
73f646ce | 1430 | int mtyp = msg_type(hdr); |
d999297c JPM |
1431 | char *if_name; |
1432 | int rc = 0; | |
1433 | ||
662921cd | 1434 | if (tipc_link_is_blocked(l)) |
d999297c JPM |
1435 | goto exit; |
1436 | ||
1437 | if (link_own_addr(l) > msg_prevnode(hdr)) | |
1438 | l->net_plane = msg_net_plane(hdr); | |
1439 | ||
73f646ce | 1440 | switch (mtyp) { |
d999297c JPM |
1441 | case RESET_MSG: |
1442 | ||
1443 | /* Ignore duplicate RESET with old session number */ | |
1444 | if ((less_eq(msg_session(hdr), l->peer_session)) && | |
1445 | (l->peer_session != WILDCARD_SESSION)) | |
1446 | break; | |
1447 | /* fall thru' */ | |
662921cd | 1448 | |
d999297c JPM |
1449 | case ACTIVATE_MSG: |
1450 | ||
1451 | /* Complete own link name with peer's interface name */ | |
1452 | if_name = strrchr(l->name, ':') + 1; | |
1453 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1454 | break; | |
1455 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1456 | break; | |
1457 | strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME); | |
1458 | ||
1459 | /* Update own tolerance if peer indicates a non-zero value */ | |
1460 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1461 | l->tolerance = peers_tol; | |
1462 | ||
1463 | /* Update own priority if peer's priority is higher */ | |
1464 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1465 | l->priority = peers_prio; | |
1466 | ||
73f646ce JPM |
1467 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
1468 | if ((mtyp == RESET_MSG) || !link_is_up(l)) | |
1469 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); | |
1470 | ||
1471 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
1472 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) | |
1473 | rc = TIPC_LINK_UP_EVT; | |
1474 | ||
d999297c JPM |
1475 | l->peer_session = msg_session(hdr); |
1476 | l->peer_bearer_id = msg_bearer_id(hdr); | |
d999297c JPM |
1477 | if (l->mtu > msg_max_pkt(hdr)) |
1478 | l->mtu = msg_max_pkt(hdr); | |
1479 | break; | |
662921cd | 1480 | |
d999297c | 1481 | case STATE_MSG: |
662921cd | 1482 | |
d999297c JPM |
1483 | /* Update own tolerance if peer indicates a non-zero value */ |
1484 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1485 | l->tolerance = peers_tol; | |
1486 | ||
1487 | l->silent_intv_cnt = 0; | |
1488 | l->stats.recv_states++; | |
1489 | if (msg_probe(hdr)) | |
1490 | l->stats.recv_probes++; | |
73f646ce JPM |
1491 | |
1492 | if (!link_is_up(l)) { | |
1493 | if (l->state == LINK_ESTABLISHING) | |
1494 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1495 | break; |
73f646ce | 1496 | } |
d999297c | 1497 | |
662921cd | 1498 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1499 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c JPM |
1500 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
1501 | if (rcvgap || (msg_probe(hdr))) | |
1502 | tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap, | |
16040894 | 1503 | 0, 0, xmitq); |
c1ab3f1d | 1504 | tipc_link_release_pkts(l, ack); |
d999297c JPM |
1505 | |
1506 | /* If NACK, retransmit will now start at right position */ | |
c1ab3f1d JPM |
1507 | if (gap) { |
1508 | rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq); | |
d999297c JPM |
1509 | l->stats.recv_nacks++; |
1510 | } | |
662921cd | 1511 | |
d999297c JPM |
1512 | tipc_link_advance_backlog(l, xmitq); |
1513 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1514 | link_prepare_wakeup(l); | |
1515 | } | |
1516 | exit: | |
1517 | kfree_skb(skb); | |
1518 | return rc; | |
1519 | } | |
1520 | ||
e3eea1eb | 1521 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1522 | { |
ed193ece | 1523 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1524 | |
1525 | l->window = win; | |
1f66d161 JPM |
1526 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1527 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1528 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1529 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1530 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1531 | } |
1532 | ||
e099e86c | 1533 | /* tipc_link_find_owner - locate owner node of link by link's name |
f2f9800d | 1534 | * @net: the applicable net namespace |
e099e86c JPM |
1535 | * @name: pointer to link name string |
1536 | * @bearer_id: pointer to index in 'node->links' array where the link was found. | |
c4307285 | 1537 | * |
e099e86c | 1538 | * Returns pointer to node owning the link, or 0 if no matching link is found. |
b97bf3fd | 1539 | */ |
f2f9800d YX |
1540 | static struct tipc_node *tipc_link_find_owner(struct net *net, |
1541 | const char *link_name, | |
e099e86c | 1542 | unsigned int *bearer_id) |
b97bf3fd | 1543 | { |
f2f9800d | 1544 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
a18c4bc3 | 1545 | struct tipc_link *l_ptr; |
bbfbe47c | 1546 | struct tipc_node *n_ptr; |
886eaa1f | 1547 | struct tipc_node *found_node = NULL; |
bbfbe47c | 1548 | int i; |
b97bf3fd | 1549 | |
e099e86c | 1550 | *bearer_id = 0; |
6c7a762e | 1551 | rcu_read_lock(); |
f2f9800d | 1552 | list_for_each_entry_rcu(n_ptr, &tn->node_list, list) { |
a11607f5 | 1553 | tipc_node_lock(n_ptr); |
bbfbe47c | 1554 | for (i = 0; i < MAX_BEARERS; i++) { |
9d13ec65 | 1555 | l_ptr = n_ptr->links[i].link; |
e099e86c JPM |
1556 | if (l_ptr && !strcmp(l_ptr->name, link_name)) { |
1557 | *bearer_id = i; | |
1558 | found_node = n_ptr; | |
1559 | break; | |
1560 | } | |
bbfbe47c | 1561 | } |
a11607f5 | 1562 | tipc_node_unlock(n_ptr); |
e099e86c JPM |
1563 | if (found_node) |
1564 | break; | |
bbfbe47c | 1565 | } |
6c7a762e YX |
1566 | rcu_read_unlock(); |
1567 | ||
e099e86c | 1568 | return found_node; |
b97bf3fd PL |
1569 | } |
1570 | ||
b97bf3fd PL |
1571 | /** |
1572 | * link_reset_statistics - reset link statistics | |
1573 | * @l_ptr: pointer to link | |
1574 | */ | |
a18c4bc3 | 1575 | static void link_reset_statistics(struct tipc_link *l_ptr) |
b97bf3fd PL |
1576 | { |
1577 | memset(&l_ptr->stats, 0, sizeof(l_ptr->stats)); | |
a97b9d3f JPM |
1578 | l_ptr->stats.sent_info = l_ptr->snd_nxt; |
1579 | l_ptr->stats.recv_info = l_ptr->rcv_nxt; | |
b97bf3fd PL |
1580 | } |
1581 | ||
1a20cc25 | 1582 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1583 | { |
1a20cc25 | 1584 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 1585 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 1586 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 1587 | |
662921cd | 1588 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1589 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1590 | skb_queue_len(&l->transmq), head, tail, | |
1591 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1592 | } |
0655f6a8 RA |
1593 | |
1594 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1595 | */ | |
1596 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1597 | { | |
1598 | int err; | |
1599 | ||
1600 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1601 | tipc_nl_prop_policy); | |
1602 | if (err) | |
1603 | return err; | |
1604 | ||
1605 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1606 | u32 prio; | |
1607 | ||
1608 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1609 | if (prio > TIPC_MAX_LINK_PRI) | |
1610 | return -EINVAL; | |
1611 | } | |
1612 | ||
1613 | if (props[TIPC_NLA_PROP_TOL]) { | |
1614 | u32 tol; | |
1615 | ||
1616 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1617 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1618 | return -EINVAL; | |
1619 | } | |
1620 | ||
1621 | if (props[TIPC_NLA_PROP_WIN]) { | |
1622 | u32 win; | |
1623 | ||
1624 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1625 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1626 | return -EINVAL; | |
1627 | } | |
1628 | ||
1629 | return 0; | |
1630 | } | |
7be57fc6 | 1631 | |
f96ce7a2 RA |
1632 | int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info) |
1633 | { | |
1634 | int err; | |
1635 | int res = 0; | |
1636 | int bearer_id; | |
1637 | char *name; | |
1638 | struct tipc_link *link; | |
1639 | struct tipc_node *node; | |
1640 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
37e2d484 | 1641 | struct net *net = sock_net(skb->sk); |
f96ce7a2 RA |
1642 | |
1643 | if (!info->attrs[TIPC_NLA_LINK]) | |
1644 | return -EINVAL; | |
1645 | ||
1646 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
1647 | info->attrs[TIPC_NLA_LINK], | |
1648 | tipc_nl_link_policy); | |
1649 | if (err) | |
1650 | return err; | |
1651 | ||
1652 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
1653 | return -EINVAL; | |
1654 | ||
1655 | name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
1656 | ||
670f4f88 RA |
1657 | if (strcmp(name, tipc_bclink_name) == 0) |
1658 | return tipc_nl_bc_link_set(net, attrs); | |
1659 | ||
f2f9800d | 1660 | node = tipc_link_find_owner(net, name, &bearer_id); |
f96ce7a2 RA |
1661 | if (!node) |
1662 | return -EINVAL; | |
1663 | ||
1664 | tipc_node_lock(node); | |
1665 | ||
9d13ec65 | 1666 | link = node->links[bearer_id].link; |
f96ce7a2 RA |
1667 | if (!link) { |
1668 | res = -EINVAL; | |
1669 | goto out; | |
1670 | } | |
1671 | ||
1672 | if (attrs[TIPC_NLA_LINK_PROP]) { | |
1673 | struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; | |
1674 | ||
1675 | err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], | |
1676 | props); | |
1677 | if (err) { | |
1678 | res = err; | |
1679 | goto out; | |
1680 | } | |
1681 | ||
1682 | if (props[TIPC_NLA_PROP_TOL]) { | |
1683 | u32 tol; | |
1684 | ||
1685 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
8a1577c9 | 1686 | link->tolerance = tol; |
ed193ece | 1687 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0); |
f96ce7a2 RA |
1688 | } |
1689 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1690 | u32 prio; | |
1691 | ||
1692 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1693 | link->priority = prio; | |
ed193ece | 1694 | tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio); |
f96ce7a2 RA |
1695 | } |
1696 | if (props[TIPC_NLA_PROP_WIN]) { | |
1697 | u32 win; | |
1698 | ||
1699 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1700 | tipc_link_set_queue_limits(link, win); | |
1701 | } | |
1702 | } | |
1703 | ||
1704 | out: | |
1705 | tipc_node_unlock(node); | |
1706 | ||
1707 | return res; | |
1708 | } | |
d8182804 RA |
1709 | |
1710 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) | |
7be57fc6 RA |
1711 | { |
1712 | int i; | |
1713 | struct nlattr *stats; | |
1714 | ||
1715 | struct nla_map { | |
1716 | u32 key; | |
1717 | u32 val; | |
1718 | }; | |
1719 | ||
1720 | struct nla_map map[] = { | |
1721 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1722 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1723 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1724 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1725 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
1726 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
1727 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
1728 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1729 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1730 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1731 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1732 | s->msg_length_counts : 1}, | |
1733 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1734 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1735 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1736 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1737 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1738 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1739 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1740 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1741 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1742 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1743 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1744 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1745 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1746 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1747 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1748 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1749 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1750 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1751 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1752 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1753 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1754 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1755 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1756 | }; | |
1757 | ||
1758 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1759 | if (!stats) | |
1760 | return -EMSGSIZE; | |
1761 | ||
1762 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1763 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1764 | goto msg_full; | |
1765 | ||
1766 | nla_nest_end(skb, stats); | |
1767 | ||
1768 | return 0; | |
1769 | msg_full: | |
1770 | nla_nest_cancel(skb, stats); | |
1771 | ||
1772 | return -EMSGSIZE; | |
1773 | } | |
1774 | ||
1775 | /* Caller should hold appropriate locks to protect the link */ | |
34747539 | 1776 | static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
f2f67390 | 1777 | struct tipc_link *link, int nlflags) |
7be57fc6 RA |
1778 | { |
1779 | int err; | |
1780 | void *hdr; | |
1781 | struct nlattr *attrs; | |
1782 | struct nlattr *prop; | |
34747539 | 1783 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 1784 | |
bfb3e5dd | 1785 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1786 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1787 | if (!hdr) |
1788 | return -EMSGSIZE; | |
1789 | ||
1790 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1791 | if (!attrs) | |
1792 | goto msg_full; | |
1793 | ||
1794 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
1795 | goto attr_msg_full; | |
1796 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 1797 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 1798 | goto attr_msg_full; |
ed193ece | 1799 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 1800 | goto attr_msg_full; |
a97b9d3f | 1801 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
7be57fc6 | 1802 | goto attr_msg_full; |
a97b9d3f | 1803 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
7be57fc6 RA |
1804 | goto attr_msg_full; |
1805 | ||
1806 | if (tipc_link_is_up(link)) | |
1807 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1808 | goto attr_msg_full; | |
1809 | if (tipc_link_is_active(link)) | |
1810 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) | |
1811 | goto attr_msg_full; | |
1812 | ||
1813 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1814 | if (!prop) | |
1815 | goto attr_msg_full; | |
1816 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1817 | goto prop_msg_full; | |
1818 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
1819 | goto prop_msg_full; | |
1820 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 1821 | link->window)) |
7be57fc6 RA |
1822 | goto prop_msg_full; |
1823 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1824 | goto prop_msg_full; | |
1825 | nla_nest_end(msg->skb, prop); | |
1826 | ||
1827 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
1828 | if (err) | |
1829 | goto attr_msg_full; | |
1830 | ||
1831 | nla_nest_end(msg->skb, attrs); | |
1832 | genlmsg_end(msg->skb, hdr); | |
1833 | ||
1834 | return 0; | |
1835 | ||
1836 | prop_msg_full: | |
1837 | nla_nest_cancel(msg->skb, prop); | |
1838 | attr_msg_full: | |
1839 | nla_nest_cancel(msg->skb, attrs); | |
1840 | msg_full: | |
1841 | genlmsg_cancel(msg->skb, hdr); | |
1842 | ||
1843 | return -EMSGSIZE; | |
1844 | } | |
1845 | ||
1846 | /* Caller should hold node lock */ | |
34747539 YX |
1847 | static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg, |
1848 | struct tipc_node *node, u32 *prev_link) | |
7be57fc6 RA |
1849 | { |
1850 | u32 i; | |
1851 | int err; | |
1852 | ||
1853 | for (i = *prev_link; i < MAX_BEARERS; i++) { | |
1854 | *prev_link = i; | |
1855 | ||
9d13ec65 | 1856 | if (!node->links[i].link) |
7be57fc6 RA |
1857 | continue; |
1858 | ||
9d13ec65 JPM |
1859 | err = __tipc_nl_add_link(net, msg, |
1860 | node->links[i].link, NLM_F_MULTI); | |
7be57fc6 RA |
1861 | if (err) |
1862 | return err; | |
1863 | } | |
1864 | *prev_link = 0; | |
1865 | ||
1866 | return 0; | |
1867 | } | |
1868 | ||
1869 | int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
1870 | { | |
f2f9800d YX |
1871 | struct net *net = sock_net(skb->sk); |
1872 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
7be57fc6 RA |
1873 | struct tipc_node *node; |
1874 | struct tipc_nl_msg msg; | |
1875 | u32 prev_node = cb->args[0]; | |
1876 | u32 prev_link = cb->args[1]; | |
1877 | int done = cb->args[2]; | |
1878 | int err; | |
1879 | ||
1880 | if (done) | |
1881 | return 0; | |
1882 | ||
1883 | msg.skb = skb; | |
1884 | msg.portid = NETLINK_CB(cb->skb).portid; | |
1885 | msg.seq = cb->nlh->nlmsg_seq; | |
1886 | ||
1887 | rcu_read_lock(); | |
7be57fc6 | 1888 | if (prev_node) { |
f2f9800d | 1889 | node = tipc_node_find(net, prev_node); |
7be57fc6 RA |
1890 | if (!node) { |
1891 | /* We never set seq or call nl_dump_check_consistent() | |
1892 | * this means that setting prev_seq here will cause the | |
1893 | * consistence check to fail in the netlink callback | |
1894 | * handler. Resulting in the last NLMSG_DONE message | |
1895 | * having the NLM_F_DUMP_INTR flag set. | |
1896 | */ | |
1897 | cb->prev_seq = 1; | |
1898 | goto out; | |
1899 | } | |
8a0f6ebe | 1900 | tipc_node_put(node); |
7be57fc6 | 1901 | |
f2f9800d YX |
1902 | list_for_each_entry_continue_rcu(node, &tn->node_list, |
1903 | list) { | |
7be57fc6 | 1904 | tipc_node_lock(node); |
34747539 YX |
1905 | err = __tipc_nl_add_node_links(net, &msg, node, |
1906 | &prev_link); | |
7be57fc6 RA |
1907 | tipc_node_unlock(node); |
1908 | if (err) | |
1909 | goto out; | |
1910 | ||
1911 | prev_node = node->addr; | |
1912 | } | |
1913 | } else { | |
1da46568 | 1914 | err = tipc_nl_add_bc_link(net, &msg); |
7be57fc6 RA |
1915 | if (err) |
1916 | goto out; | |
1917 | ||
f2f9800d | 1918 | list_for_each_entry_rcu(node, &tn->node_list, list) { |
7be57fc6 | 1919 | tipc_node_lock(node); |
34747539 YX |
1920 | err = __tipc_nl_add_node_links(net, &msg, node, |
1921 | &prev_link); | |
7be57fc6 RA |
1922 | tipc_node_unlock(node); |
1923 | if (err) | |
1924 | goto out; | |
1925 | ||
1926 | prev_node = node->addr; | |
1927 | } | |
1928 | } | |
1929 | done = 1; | |
1930 | out: | |
1931 | rcu_read_unlock(); | |
1932 | ||
1933 | cb->args[0] = prev_node; | |
1934 | cb->args[1] = prev_link; | |
1935 | cb->args[2] = done; | |
1936 | ||
1937 | return skb->len; | |
1938 | } | |
1939 | ||
1940 | int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info) | |
1941 | { | |
f2f9800d | 1942 | struct net *net = genl_info_net(info); |
7be57fc6 | 1943 | struct tipc_nl_msg msg; |
7be57fc6 | 1944 | char *name; |
7be57fc6 RA |
1945 | int err; |
1946 | ||
670f4f88 RA |
1947 | msg.portid = info->snd_portid; |
1948 | msg.seq = info->snd_seq; | |
1949 | ||
7be57fc6 RA |
1950 | if (!info->attrs[TIPC_NLA_LINK_NAME]) |
1951 | return -EINVAL; | |
7be57fc6 | 1952 | name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]); |
7be57fc6 | 1953 | |
670f4f88 RA |
1954 | msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
1955 | if (!msg.skb) | |
7be57fc6 RA |
1956 | return -ENOMEM; |
1957 | ||
670f4f88 RA |
1958 | if (strcmp(name, tipc_bclink_name) == 0) { |
1959 | err = tipc_nl_add_bc_link(net, &msg); | |
1960 | if (err) { | |
1961 | nlmsg_free(msg.skb); | |
1962 | return err; | |
1963 | } | |
1964 | } else { | |
1965 | int bearer_id; | |
1966 | struct tipc_node *node; | |
1967 | struct tipc_link *link; | |
7be57fc6 | 1968 | |
670f4f88 RA |
1969 | node = tipc_link_find_owner(net, name, &bearer_id); |
1970 | if (!node) | |
1971 | return -EINVAL; | |
7be57fc6 | 1972 | |
670f4f88 | 1973 | tipc_node_lock(node); |
9d13ec65 | 1974 | link = node->links[bearer_id].link; |
670f4f88 RA |
1975 | if (!link) { |
1976 | tipc_node_unlock(node); | |
1977 | nlmsg_free(msg.skb); | |
1978 | return -EINVAL; | |
1979 | } | |
7be57fc6 | 1980 | |
670f4f88 RA |
1981 | err = __tipc_nl_add_link(net, &msg, link, 0); |
1982 | tipc_node_unlock(node); | |
1983 | if (err) { | |
1984 | nlmsg_free(msg.skb); | |
1985 | return err; | |
1986 | } | |
1987 | } | |
7be57fc6 | 1988 | |
670f4f88 | 1989 | return genlmsg_reply(msg.skb, info); |
7be57fc6 | 1990 | } |
ae36342b RA |
1991 | |
1992 | int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info) | |
1993 | { | |
1994 | int err; | |
1995 | char *link_name; | |
1996 | unsigned int bearer_id; | |
1997 | struct tipc_link *link; | |
1998 | struct tipc_node *node; | |
1999 | struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1]; | |
1817877b | 2000 | struct net *net = sock_net(skb->sk); |
ae36342b RA |
2001 | |
2002 | if (!info->attrs[TIPC_NLA_LINK]) | |
2003 | return -EINVAL; | |
2004 | ||
2005 | err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX, | |
2006 | info->attrs[TIPC_NLA_LINK], | |
2007 | tipc_nl_link_policy); | |
2008 | if (err) | |
2009 | return err; | |
2010 | ||
2011 | if (!attrs[TIPC_NLA_LINK_NAME]) | |
2012 | return -EINVAL; | |
2013 | ||
2014 | link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]); | |
2015 | ||
2016 | if (strcmp(link_name, tipc_bclink_name) == 0) { | |
1da46568 | 2017 | err = tipc_bclink_reset_stats(net); |
ae36342b RA |
2018 | if (err) |
2019 | return err; | |
2020 | return 0; | |
2021 | } | |
2022 | ||
f2f9800d | 2023 | node = tipc_link_find_owner(net, link_name, &bearer_id); |
ae36342b RA |
2024 | if (!node) |
2025 | return -EINVAL; | |
2026 | ||
2027 | tipc_node_lock(node); | |
2028 | ||
9d13ec65 | 2029 | link = node->links[bearer_id].link; |
ae36342b RA |
2030 | if (!link) { |
2031 | tipc_node_unlock(node); | |
2032 | return -EINVAL; | |
2033 | } | |
2034 | ||
2035 | link_reset_statistics(link); | |
2036 | ||
2037 | tipc_node_unlock(node); | |
2038 | ||
2039 | return 0; | |
2040 | } |