Commit | Line | Data |
---|---|---|
60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * | |
60c778b2 | 6 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
7 | * |
8 | * These functions work with the state functions in sctp_sm_statefuns.c | |
9 | * to implement that state operations. These functions implement the | |
10 | * steps which require modifying existing data structures. | |
11 | * | |
60c778b2 | 12 | * This SCTP implementation is free software; |
1da177e4 LT |
13 | * you can redistribute it and/or modify it under the terms of |
14 | * the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2, or (at your option) | |
16 | * any later version. | |
17 | * | |
60c778b2 | 18 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
19 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
20 | * ************************ | |
21 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
22 | * See the GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
4b2f13a2 JK |
25 | * along with GNU CC; see the file COPYING. If not, see |
26 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
27 | * |
28 | * Please send any bug reports or fixes you make to the | |
29 | * email address(es): | |
91705c61 | 30 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 31 | * |
1da177e4 LT |
32 | * Written or modified by: |
33 | * La Monte H.P. Yarroll <piggy@acm.org> | |
34 | * Karl Knutson <karl@athena.chicago.il.us> | |
35 | * Jon Grimm <jgrimm@austin.ibm.com> | |
36 | * Hui Huang <hui.huang@nokia.com> | |
37 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
38 | * Daisy Chang <daisyc@us.ibm.com> | |
39 | * Sridhar Samudrala <sri@us.ibm.com> | |
40 | * Ardelle Fan <ardelle.fan@intel.com> | |
1da177e4 LT |
41 | */ |
42 | ||
145ce502 JP |
43 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
44 | ||
1da177e4 LT |
45 | #include <linux/skbuff.h> |
46 | #include <linux/types.h> | |
47 | #include <linux/socket.h> | |
48 | #include <linux/ip.h> | |
5a0e3ad6 | 49 | #include <linux/gfp.h> |
1da177e4 LT |
50 | #include <net/sock.h> |
51 | #include <net/sctp/sctp.h> | |
52 | #include <net/sctp/sm.h> | |
53 | ||
54 | static int sctp_cmd_interpreter(sctp_event_t event_type, | |
55 | sctp_subtype_t subtype, | |
56 | sctp_state_t state, | |
57 | struct sctp_endpoint *ep, | |
58 | struct sctp_association *asoc, | |
59 | void *event_arg, | |
d808ad9a | 60 | sctp_disposition_t status, |
1da177e4 | 61 | sctp_cmd_seq_t *commands, |
dd0fc66f | 62 | gfp_t gfp); |
1da177e4 LT |
63 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, |
64 | sctp_state_t state, | |
65 | struct sctp_endpoint *ep, | |
649621e3 | 66 | struct sctp_association **asoc, |
1da177e4 LT |
67 | void *event_arg, |
68 | sctp_disposition_t status, | |
69 | sctp_cmd_seq_t *commands, | |
dd0fc66f | 70 | gfp_t gfp); |
1da177e4 LT |
71 | |
72 | /******************************************************************** | |
73 | * Helper functions | |
74 | ********************************************************************/ | |
75 | ||
76 | /* A helper function for delayed processing of INET ECN CE bit. */ | |
d808ad9a | 77 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
1da177e4 LT |
78 | __u32 lowest_tsn) |
79 | { | |
80 | /* Save the TSN away for comparison when we receive CWR */ | |
81 | ||
82 | asoc->last_ecne_tsn = lowest_tsn; | |
83 | asoc->need_ecne = 1; | |
84 | } | |
85 | ||
86 | /* Helper function for delayed processing of SCTP ECNE chunk. */ | |
87 | /* RFC 2960 Appendix A | |
88 | * | |
89 | * RFC 2481 details a specific bit for a sender to send in | |
90 | * the header of its next outbound TCP segment to indicate to | |
91 | * its peer that it has reduced its congestion window. This | |
92 | * is termed the CWR bit. For SCTP the same indication is made | |
93 | * by including the CWR chunk. This chunk contains one data | |
94 | * element, i.e. the TSN number that was sent in the ECNE chunk. | |
95 | * This element represents the lowest TSN number in the datagram | |
96 | * that was originally marked with the CE bit. | |
97 | */ | |
98 | static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc, | |
99 | __u32 lowest_tsn, | |
100 | struct sctp_chunk *chunk) | |
101 | { | |
102 | struct sctp_chunk *repl; | |
103 | ||
104 | /* Our previously transmitted packet ran into some congestion | |
105 | * so we should take action by reducing cwnd and ssthresh | |
106 | * and then ACK our peer that we we've done so by | |
107 | * sending a CWR. | |
108 | */ | |
109 | ||
110 | /* First, try to determine if we want to actually lower | |
111 | * our cwnd variables. Only lower them if the ECNE looks more | |
112 | * recent than the last response. | |
113 | */ | |
114 | if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) { | |
115 | struct sctp_transport *transport; | |
116 | ||
117 | /* Find which transport's congestion variables | |
118 | * need to be adjusted. | |
119 | */ | |
120 | transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn); | |
121 | ||
122 | /* Update the congestion variables. */ | |
123 | if (transport) | |
124 | sctp_transport_lower_cwnd(transport, | |
125 | SCTP_LOWER_CWND_ECNE); | |
126 | asoc->last_cwr_tsn = lowest_tsn; | |
127 | } | |
128 | ||
129 | /* Always try to quiet the other end. In case of lost CWR, | |
130 | * resend last_cwr_tsn. | |
131 | */ | |
132 | repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk); | |
133 | ||
134 | /* If we run out of memory, it will look like a lost CWR. We'll | |
135 | * get back in sync eventually. | |
136 | */ | |
137 | return repl; | |
138 | } | |
139 | ||
140 | /* Helper function to do delayed processing of ECN CWR chunk. */ | |
141 | static void sctp_do_ecn_cwr_work(struct sctp_association *asoc, | |
142 | __u32 lowest_tsn) | |
143 | { | |
144 | /* Turn off ECNE getting auto-prepended to every outgoing | |
145 | * packet | |
146 | */ | |
147 | asoc->need_ecne = 0; | |
148 | } | |
149 | ||
150 | /* Generate SACK if necessary. We call this at the end of a packet. */ | |
151 | static int sctp_gen_sack(struct sctp_association *asoc, int force, | |
152 | sctp_cmd_seq_t *commands) | |
153 | { | |
154 | __u32 ctsn, max_tsn_seen; | |
155 | struct sctp_chunk *sack; | |
52ccb8e9 | 156 | struct sctp_transport *trans = asoc->peer.last_data_from; |
1da177e4 LT |
157 | int error = 0; |
158 | ||
d808ad9a | 159 | if (force || |
52ccb8e9 FF |
160 | (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || |
161 | (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) | |
1da177e4 LT |
162 | asoc->peer.sack_needed = 1; |
163 | ||
164 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
165 | max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); | |
166 | ||
167 | /* From 12.2 Parameters necessary per association (i.e. the TCB): | |
168 | * | |
169 | * Ack State : This flag indicates if the next received packet | |
170 | * : is to be responded to with a SACK. ... | |
171 | * : When DATA chunks are out of order, SACK's | |
172 | * : are not delayed (see Section 6). | |
173 | * | |
174 | * [This is actually not mentioned in Section 6, but we | |
175 | * implement it here anyway. --piggy] | |
176 | */ | |
d808ad9a | 177 | if (max_tsn_seen != ctsn) |
1da177e4 LT |
178 | asoc->peer.sack_needed = 1; |
179 | ||
180 | /* From 6.2 Acknowledgement on Reception of DATA Chunks: | |
181 | * | |
182 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, | |
183 | * an acknowledgement SHOULD be generated for at least every | |
184 | * second packet (not every second DATA chunk) received, and | |
185 | * SHOULD be generated within 200 ms of the arrival of any | |
186 | * unacknowledged DATA chunk. ... | |
187 | */ | |
188 | if (!asoc->peer.sack_needed) { | |
d364d927 | 189 | asoc->peer.sack_cnt++; |
52ccb8e9 FF |
190 | |
191 | /* Set the SACK delay timeout based on the | |
192 | * SACK delay for the last transport | |
193 | * data was received from, or the default | |
194 | * for the association. | |
195 | */ | |
d364d927 WY |
196 | if (trans) { |
197 | /* We will need a SACK for the next packet. */ | |
198 | if (asoc->peer.sack_cnt >= trans->sackfreq - 1) | |
199 | asoc->peer.sack_needed = 1; | |
200 | ||
d808ad9a | 201 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 202 | trans->sackdelay; |
d364d927 WY |
203 | } else { |
204 | /* We will need a SACK for the next packet. */ | |
205 | if (asoc->peer.sack_cnt >= asoc->sackfreq - 1) | |
206 | asoc->peer.sack_needed = 1; | |
207 | ||
d808ad9a | 208 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 209 | asoc->sackdelay; |
d364d927 | 210 | } |
52ccb8e9 FF |
211 | |
212 | /* Restart the SACK timer. */ | |
213 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
214 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 | 215 | } else { |
07b4d6a1 MRL |
216 | __u32 old_a_rwnd = asoc->a_rwnd; |
217 | ||
90f2f531 | 218 | asoc->a_rwnd = asoc->rwnd; |
1da177e4 | 219 | sack = sctp_make_sack(asoc); |
07b4d6a1 MRL |
220 | if (!sack) { |
221 | asoc->a_rwnd = old_a_rwnd; | |
1da177e4 | 222 | goto nomem; |
07b4d6a1 | 223 | } |
1da177e4 LT |
224 | |
225 | asoc->peer.sack_needed = 0; | |
d364d927 | 226 | asoc->peer.sack_cnt = 0; |
1da177e4 | 227 | |
732ba35e | 228 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
1da177e4 LT |
229 | |
230 | /* Stop the SACK timer. */ | |
231 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
232 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
233 | } | |
52ccb8e9 | 234 | |
1da177e4 LT |
235 | return error; |
236 | nomem: | |
237 | error = -ENOMEM; | |
238 | return error; | |
239 | } | |
240 | ||
241 | /* When the T3-RTX timer expires, it calls this function to create the | |
242 | * relevant state machine event. | |
243 | */ | |
244 | void sctp_generate_t3_rtx_event(unsigned long peer) | |
245 | { | |
246 | int error; | |
247 | struct sctp_transport *transport = (struct sctp_transport *) peer; | |
248 | struct sctp_association *asoc = transport->asoc; | |
635682a1 KH |
249 | struct sock *sk = asoc->base.sk; |
250 | struct net *net = sock_net(sk); | |
1da177e4 LT |
251 | |
252 | /* Check whether a task is in the sock. */ | |
253 | ||
635682a1 KH |
254 | bh_lock_sock(sk); |
255 | if (sock_owned_by_user(sk)) { | |
bb33381d | 256 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
257 | |
258 | /* Try again later. */ | |
259 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) | |
260 | sctp_transport_hold(transport); | |
261 | goto out_unlock; | |
262 | } | |
263 | ||
1da177e4 | 264 | /* Run through the state machine. */ |
55e26eb9 | 265 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
266 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), |
267 | asoc->state, | |
268 | asoc->ep, asoc, | |
269 | transport, GFP_ATOMIC); | |
270 | ||
271 | if (error) | |
635682a1 | 272 | sk->sk_err = -error; |
1da177e4 LT |
273 | |
274 | out_unlock: | |
635682a1 | 275 | bh_unlock_sock(sk); |
1da177e4 LT |
276 | sctp_transport_put(transport); |
277 | } | |
278 | ||
279 | /* This is a sa interface for producing timeout events. It works | |
280 | * for timeouts which use the association as their parameter. | |
281 | */ | |
282 | static void sctp_generate_timeout_event(struct sctp_association *asoc, | |
283 | sctp_event_timeout_t timeout_type) | |
284 | { | |
635682a1 KH |
285 | struct sock *sk = asoc->base.sk; |
286 | struct net *net = sock_net(sk); | |
1da177e4 LT |
287 | int error = 0; |
288 | ||
635682a1 KH |
289 | bh_lock_sock(sk); |
290 | if (sock_owned_by_user(sk)) { | |
bb33381d DB |
291 | pr_debug("%s: sock is busy: timer %d\n", __func__, |
292 | timeout_type); | |
1da177e4 LT |
293 | |
294 | /* Try again later. */ | |
295 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) | |
296 | sctp_association_hold(asoc); | |
297 | goto out_unlock; | |
298 | } | |
299 | ||
300 | /* Is this association really dead and just waiting around for | |
301 | * the timer to let go of the reference? | |
302 | */ | |
303 | if (asoc->base.dead) | |
304 | goto out_unlock; | |
305 | ||
306 | /* Run through the state machine. */ | |
55e26eb9 | 307 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
308 | SCTP_ST_TIMEOUT(timeout_type), |
309 | asoc->state, asoc->ep, asoc, | |
310 | (void *)timeout_type, GFP_ATOMIC); | |
311 | ||
312 | if (error) | |
635682a1 | 313 | sk->sk_err = -error; |
1da177e4 LT |
314 | |
315 | out_unlock: | |
635682a1 | 316 | bh_unlock_sock(sk); |
1da177e4 LT |
317 | sctp_association_put(asoc); |
318 | } | |
319 | ||
320 | static void sctp_generate_t1_cookie_event(unsigned long data) | |
321 | { | |
322 | struct sctp_association *asoc = (struct sctp_association *) data; | |
323 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); | |
324 | } | |
325 | ||
326 | static void sctp_generate_t1_init_event(unsigned long data) | |
327 | { | |
328 | struct sctp_association *asoc = (struct sctp_association *) data; | |
329 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); | |
330 | } | |
331 | ||
332 | static void sctp_generate_t2_shutdown_event(unsigned long data) | |
333 | { | |
334 | struct sctp_association *asoc = (struct sctp_association *) data; | |
335 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); | |
336 | } | |
337 | ||
338 | static void sctp_generate_t4_rto_event(unsigned long data) | |
339 | { | |
340 | struct sctp_association *asoc = (struct sctp_association *) data; | |
341 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); | |
342 | } | |
343 | ||
344 | static void sctp_generate_t5_shutdown_guard_event(unsigned long data) | |
345 | { | |
d808ad9a YH |
346 | struct sctp_association *asoc = (struct sctp_association *)data; |
347 | sctp_generate_timeout_event(asoc, | |
1da177e4 LT |
348 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
349 | ||
350 | } /* sctp_generate_t5_shutdown_guard_event() */ | |
351 | ||
352 | static void sctp_generate_autoclose_event(unsigned long data) | |
353 | { | |
354 | struct sctp_association *asoc = (struct sctp_association *) data; | |
355 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); | |
356 | } | |
357 | ||
358 | /* Generate a heart beat event. If the sock is busy, reschedule. Make | |
359 | * sure that the transport is still valid. | |
360 | */ | |
361 | void sctp_generate_heartbeat_event(unsigned long data) | |
362 | { | |
363 | int error = 0; | |
364 | struct sctp_transport *transport = (struct sctp_transport *) data; | |
365 | struct sctp_association *asoc = transport->asoc; | |
635682a1 KH |
366 | struct sock *sk = asoc->base.sk; |
367 | struct net *net = sock_net(sk); | |
ba6f5e33 | 368 | u32 elapsed, timeout; |
1da177e4 | 369 | |
635682a1 KH |
370 | bh_lock_sock(sk); |
371 | if (sock_owned_by_user(sk)) { | |
bb33381d | 372 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
373 | |
374 | /* Try again later. */ | |
375 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) | |
376 | sctp_transport_hold(transport); | |
377 | goto out_unlock; | |
378 | } | |
379 | ||
ba6f5e33 MRL |
380 | /* Check if we should still send the heartbeat or reschedule */ |
381 | elapsed = jiffies - transport->last_time_sent; | |
382 | timeout = sctp_transport_timeout(transport); | |
383 | if (elapsed < timeout) { | |
384 | elapsed = timeout - elapsed; | |
385 | if (!mod_timer(&transport->hb_timer, jiffies + elapsed)) | |
386 | sctp_transport_hold(transport); | |
387 | goto out_unlock; | |
388 | } | |
389 | ||
55e26eb9 | 390 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
391 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
392 | asoc->state, asoc->ep, asoc, | |
393 | transport, GFP_ATOMIC); | |
394 | ||
f05940e6 | 395 | if (error) |
635682a1 | 396 | sk->sk_err = -error; |
1da177e4 LT |
397 | |
398 | out_unlock: | |
635682a1 | 399 | bh_unlock_sock(sk); |
1da177e4 LT |
400 | sctp_transport_put(transport); |
401 | } | |
402 | ||
50b5d6ad VY |
403 | /* Handle the timeout of the ICMP protocol unreachable timer. Trigger |
404 | * the correct state machine transition that will close the association. | |
405 | */ | |
406 | void sctp_generate_proto_unreach_event(unsigned long data) | |
407 | { | |
408 | struct sctp_transport *transport = (struct sctp_transport *) data; | |
409 | struct sctp_association *asoc = transport->asoc; | |
635682a1 KH |
410 | struct sock *sk = asoc->base.sk; |
411 | struct net *net = sock_net(sk); | |
cb3f837b | 412 | |
635682a1 KH |
413 | bh_lock_sock(sk); |
414 | if (sock_owned_by_user(sk)) { | |
bb33381d | 415 | pr_debug("%s: sock is busy\n", __func__); |
50b5d6ad VY |
416 | |
417 | /* Try again later. */ | |
418 | if (!mod_timer(&transport->proto_unreach_timer, | |
419 | jiffies + (HZ/20))) | |
420 | sctp_association_hold(asoc); | |
421 | goto out_unlock; | |
422 | } | |
423 | ||
424 | /* Is this structure just waiting around for us to actually | |
425 | * get destroyed? | |
426 | */ | |
427 | if (asoc->base.dead) | |
428 | goto out_unlock; | |
429 | ||
55e26eb9 | 430 | sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
50b5d6ad VY |
431 | SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH), |
432 | asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC); | |
433 | ||
434 | out_unlock: | |
635682a1 | 435 | bh_unlock_sock(sk); |
50b5d6ad VY |
436 | sctp_association_put(asoc); |
437 | } | |
438 | ||
7b9438de XL |
439 | /* Handle the timeout of the RE-CONFIG timer. */ |
440 | void sctp_generate_reconf_event(unsigned long data) | |
441 | { | |
442 | struct sctp_transport *transport = (struct sctp_transport *)data; | |
443 | struct sctp_association *asoc = transport->asoc; | |
444 | struct sock *sk = asoc->base.sk; | |
445 | struct net *net = sock_net(sk); | |
446 | int error = 0; | |
447 | ||
448 | bh_lock_sock(sk); | |
449 | if (sock_owned_by_user(sk)) { | |
450 | pr_debug("%s: sock is busy\n", __func__); | |
451 | ||
452 | /* Try again later. */ | |
453 | if (!mod_timer(&transport->reconf_timer, jiffies + (HZ / 20))) | |
454 | sctp_transport_hold(transport); | |
455 | goto out_unlock; | |
456 | } | |
457 | ||
458 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, | |
459 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_RECONF), | |
460 | asoc->state, asoc->ep, asoc, | |
461 | transport, GFP_ATOMIC); | |
462 | ||
463 | if (error) | |
464 | sk->sk_err = -error; | |
465 | ||
466 | out_unlock: | |
467 | bh_unlock_sock(sk); | |
468 | sctp_transport_put(transport); | |
469 | } | |
50b5d6ad | 470 | |
1da177e4 LT |
471 | /* Inject a SACK Timeout event into the state machine. */ |
472 | static void sctp_generate_sack_event(unsigned long data) | |
473 | { | |
474 | struct sctp_association *asoc = (struct sctp_association *) data; | |
475 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); | |
476 | } | |
477 | ||
478 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { | |
479 | NULL, | |
480 | sctp_generate_t1_cookie_event, | |
481 | sctp_generate_t1_init_event, | |
482 | sctp_generate_t2_shutdown_event, | |
483 | NULL, | |
484 | sctp_generate_t4_rto_event, | |
485 | sctp_generate_t5_shutdown_guard_event, | |
1e7d3d90 | 486 | NULL, |
7b9438de | 487 | NULL, |
1da177e4 LT |
488 | sctp_generate_sack_event, |
489 | sctp_generate_autoclose_event, | |
490 | }; | |
491 | ||
492 | ||
493 | /* RFC 2960 8.2 Path Failure Detection | |
494 | * | |
495 | * When its peer endpoint is multi-homed, an endpoint should keep a | |
496 | * error counter for each of the destination transport addresses of the | |
497 | * peer endpoint. | |
498 | * | |
499 | * Each time the T3-rtx timer expires on any address, or when a | |
500 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, | |
501 | * the error counter of that destination address will be incremented. | |
502 | * When the value in the error counter exceeds the protocol parameter | |
503 | * 'Path.Max.Retrans' of that destination address, the endpoint should | |
504 | * mark the destination transport address as inactive, and a | |
505 | * notification SHOULD be sent to the upper layer. | |
506 | * | |
507 | */ | |
5aa93bcf NH |
508 | static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands, |
509 | struct sctp_association *asoc, | |
7e99013a VY |
510 | struct sctp_transport *transport, |
511 | int is_hb) | |
1da177e4 | 512 | { |
566178f8 ZY |
513 | struct net *net = sock_net(asoc->base.sk); |
514 | ||
1da177e4 LT |
515 | /* The check for association's overall error counter exceeding the |
516 | * threshold is done in the state function. | |
517 | */ | |
b9f84786 VY |
518 | /* We are here due to a timer expiration. If the timer was |
519 | * not a HEARTBEAT, then normal error tracking is done. | |
520 | * If the timer was a heartbeat, we only increment error counts | |
521 | * when we already have an outstanding HEARTBEAT that has not | |
522 | * been acknowledged. | |
25985edc | 523 | * Additionally, some tranport states inhibit error increments. |
ad8fec17 | 524 | */ |
b9f84786 | 525 | if (!is_hb) { |
ad8fec17 | 526 | asoc->overall_error_count++; |
b9f84786 VY |
527 | if (transport->state != SCTP_INACTIVE) |
528 | transport->error_count++; | |
529 | } else if (transport->hb_sent) { | |
530 | if (transport->state != SCTP_UNCONFIRMED) | |
531 | asoc->overall_error_count++; | |
532 | if (transport->state != SCTP_INACTIVE) | |
533 | transport->error_count++; | |
534 | } | |
1da177e4 | 535 | |
5aa93bcf | 536 | /* If the transport error count is greater than the pf_retrans |
7cce3b75 | 537 | * threshold, and less than pathmaxrtx, and if the current state |
8c2eab90 KH |
538 | * is SCTP_ACTIVE, then mark this transport as Partially Failed, |
539 | * see SCTP Quick Failover Draft, section 5.1 | |
5aa93bcf | 540 | */ |
566178f8 ZY |
541 | if (net->sctp.pf_enable && |
542 | (transport->state == SCTP_ACTIVE) && | |
5aa93bcf NH |
543 | (asoc->pf_retrans < transport->pathmaxrxt) && |
544 | (transport->error_count > asoc->pf_retrans)) { | |
545 | ||
546 | sctp_assoc_control_transport(asoc, transport, | |
547 | SCTP_TRANSPORT_PF, | |
548 | 0); | |
549 | ||
550 | /* Update the hb timer to resend a heartbeat every rto */ | |
ba6f5e33 | 551 | sctp_transport_reset_hb_timer(transport); |
5aa93bcf NH |
552 | } |
553 | ||
3f7a87d2 | 554 | if (transport->state != SCTP_INACTIVE && |
b9f84786 | 555 | (transport->error_count > transport->pathmaxrxt)) { |
bb33381d DB |
556 | pr_debug("%s: association:%p transport addr:%pISpc failed\n", |
557 | __func__, asoc, &transport->ipaddr.sa); | |
558 | ||
1da177e4 LT |
559 | sctp_assoc_control_transport(asoc, transport, |
560 | SCTP_TRANSPORT_DOWN, | |
561 | SCTP_FAILED_THRESHOLD); | |
562 | } | |
563 | ||
564 | /* E2) For the destination address for which the timer | |
565 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
566 | * maximum value discussed in rule C7 above (RTO.max) may be | |
567 | * used to provide an upper bound to this doubling operation. | |
faee47cd VY |
568 | * |
569 | * Special Case: the first HB doesn't trigger exponential backoff. | |
3ad2f3fb | 570 | * The first unacknowledged HB triggers it. We do this with a flag |
faee47cd | 571 | * that indicates that we have an outstanding HB. |
1da177e4 | 572 | */ |
7e99013a | 573 | if (!is_hb || transport->hb_sent) { |
faee47cd | 574 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
196d6759 | 575 | sctp_max_rto(asoc, transport); |
faee47cd | 576 | } |
1da177e4 LT |
577 | } |
578 | ||
579 | /* Worker routine to handle INIT command failure. */ | |
580 | static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, | |
581 | struct sctp_association *asoc, | |
95c96174 | 582 | unsigned int error) |
1da177e4 LT |
583 | { |
584 | struct sctp_ulpevent *event; | |
585 | ||
cb3f837b | 586 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_CANT_STR_ASSOC, |
a5a35e76 | 587 | (__u16)error, 0, 0, NULL, |
1da177e4 LT |
588 | GFP_ATOMIC); |
589 | ||
590 | if (event) | |
591 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
592 | SCTP_ULPEVENT(event)); | |
593 | ||
594 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
595 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
596 | ||
597 | /* SEND_FAILED sent later when cleaning up the association. */ | |
598 | asoc->outqueue.error = error; | |
599 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
600 | } | |
601 | ||
602 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ | |
603 | static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, | |
604 | struct sctp_association *asoc, | |
605 | sctp_event_t event_type, | |
606 | sctp_subtype_t subtype, | |
607 | struct sctp_chunk *chunk, | |
95c96174 | 608 | unsigned int error) |
1da177e4 LT |
609 | { |
610 | struct sctp_ulpevent *event; | |
de4594a5 | 611 | struct sctp_chunk *abort; |
1da177e4 LT |
612 | /* Cancel any partial delivery in progress. */ |
613 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
614 | ||
a5a35e76 VY |
615 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
616 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
617 | (__u16)error, 0, 0, chunk, | |
618 | GFP_ATOMIC); | |
619 | else | |
620 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
621 | (__u16)error, 0, 0, NULL, | |
1da177e4 LT |
622 | GFP_ATOMIC); |
623 | if (event) | |
624 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
625 | SCTP_ULPEVENT(event)); | |
626 | ||
de4594a5 NH |
627 | if (asoc->overall_error_count >= asoc->max_retrans) { |
628 | abort = sctp_make_violation_max_retrans(asoc, chunk); | |
629 | if (abort) | |
630 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
631 | SCTP_CHUNK(abort)); | |
632 | } | |
633 | ||
1da177e4 LT |
634 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
635 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
636 | ||
1da177e4 LT |
637 | /* SEND_FAILED sent later when cleaning up the association. */ |
638 | asoc->outqueue.error = error; | |
639 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
640 | } | |
641 | ||
642 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT | |
643 | * inside the cookie. In reality, this is only used for INIT-ACK processing | |
644 | * since all other cases use "temporary" associations and can do all | |
645 | * their work in statefuns directly. | |
646 | */ | |
647 | static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, | |
648 | struct sctp_association *asoc, | |
649 | struct sctp_chunk *chunk, | |
01a992be | 650 | struct sctp_init_chunk *peer_init, |
dd0fc66f | 651 | gfp_t gfp) |
1da177e4 LT |
652 | { |
653 | int error; | |
654 | ||
655 | /* We only process the init as a sideeffect in a single | |
656 | * case. This is when we process the INIT-ACK. If we | |
657 | * fail during INIT processing (due to malloc problems), | |
658 | * just return the error and stop processing the stack. | |
659 | */ | |
de6becdc | 660 | if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp)) |
1da177e4 LT |
661 | error = -ENOMEM; |
662 | else | |
663 | error = 0; | |
664 | ||
665 | return error; | |
666 | } | |
667 | ||
668 | /* Helper function to break out starting up of heartbeat timers. */ | |
669 | static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, | |
670 | struct sctp_association *asoc) | |
671 | { | |
672 | struct sctp_transport *t; | |
1da177e4 LT |
673 | |
674 | /* Start a heartbeat timer for each transport on the association. | |
675 | * hold a reference on the transport to make sure none of | |
676 | * the needed data structures go away. | |
677 | */ | |
ba6f5e33 MRL |
678 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) |
679 | sctp_transport_reset_hb_timer(t); | |
1da177e4 LT |
680 | } |
681 | ||
682 | static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, | |
683 | struct sctp_association *asoc) | |
684 | { | |
685 | struct sctp_transport *t; | |
1da177e4 LT |
686 | |
687 | /* Stop all heartbeat timers. */ | |
688 | ||
9dbc15f0 RD |
689 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
690 | transports) { | |
1da177e4 LT |
691 | if (del_timer(&t->hb_timer)) |
692 | sctp_transport_put(t); | |
693 | } | |
694 | } | |
695 | ||
696 | /* Helper function to stop any pending T3-RTX timers */ | |
697 | static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, | |
d808ad9a | 698 | struct sctp_association *asoc) |
1da177e4 LT |
699 | { |
700 | struct sctp_transport *t; | |
1da177e4 | 701 | |
9dbc15f0 RD |
702 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
703 | transports) { | |
25cc4ae9 | 704 | if (del_timer(&t->T3_rtx_timer)) |
1da177e4 | 705 | sctp_transport_put(t); |
1da177e4 LT |
706 | } |
707 | } | |
708 | ||
709 | ||
1da177e4 LT |
710 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ |
711 | static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, | |
712 | struct sctp_association *asoc, | |
713 | struct sctp_transport *t, | |
714 | struct sctp_chunk *chunk) | |
715 | { | |
716 | sctp_sender_hb_info_t *hbinfo; | |
34d2d89f | 717 | int was_unconfirmed = 0; |
1da177e4 LT |
718 | |
719 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the | |
720 | * HEARTBEAT should clear the error counter of the destination | |
721 | * transport address to which the HEARTBEAT was sent. | |
1da177e4 LT |
722 | */ |
723 | t->error_count = 0; | |
f8d96052 TG |
724 | |
725 | /* | |
726 | * Although RFC4960 specifies that the overall error count must | |
727 | * be cleared when a HEARTBEAT ACK is received, we make an | |
728 | * exception while in SHUTDOWN PENDING. If the peer keeps its | |
729 | * window shut forever, we may never be able to transmit our | |
730 | * outstanding data and rely on the retransmission limit be reached | |
731 | * to shutdown the association. | |
732 | */ | |
f648f807 | 733 | if (t->asoc->state < SCTP_STATE_SHUTDOWN_PENDING) |
f8d96052 | 734 | t->asoc->overall_error_count = 0; |
1da177e4 | 735 | |
faee47cd VY |
736 | /* Clear the hb_sent flag to signal that we had a good |
737 | * acknowledgement. | |
738 | */ | |
739 | t->hb_sent = 0; | |
740 | ||
1da177e4 LT |
741 | /* Mark the destination transport address as active if it is not so |
742 | * marked. | |
743 | */ | |
34d2d89f MH |
744 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) { |
745 | was_unconfirmed = 1; | |
1da177e4 LT |
746 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
747 | SCTP_HEARTBEAT_SUCCESS); | |
34d2d89f | 748 | } |
1da177e4 | 749 | |
5aa93bcf NH |
750 | if (t->state == SCTP_PF) |
751 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, | |
752 | SCTP_HEARTBEAT_SUCCESS); | |
753 | ||
8c2f414a DB |
754 | /* HB-ACK was received for a the proper HB. Consider this |
755 | * forward progress. | |
756 | */ | |
757 | if (t->dst) | |
c86a773c | 758 | sctp_transport_dst_confirm(t); |
8c2f414a | 759 | |
1da177e4 LT |
760 | /* The receiver of the HEARTBEAT ACK should also perform an |
761 | * RTT measurement for that destination transport address | |
762 | * using the time value carried in the HEARTBEAT ACK chunk. | |
e533ca16 VY |
763 | * If the transport's rto_pending variable has been cleared, |
764 | * it was most likely due to a retransmit. However, we want | |
765 | * to re-enable it to properly update the rto. | |
1da177e4 | 766 | */ |
e533ca16 VY |
767 | if (t->rto_pending == 0) |
768 | t->rto_pending = 1; | |
769 | ||
1da177e4 LT |
770 | hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; |
771 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); | |
ad8fec17 SS |
772 | |
773 | /* Update the heartbeat timer. */ | |
ba6f5e33 | 774 | sctp_transport_reset_hb_timer(t); |
34d2d89f MH |
775 | |
776 | if (was_unconfirmed && asoc->peer.transport_count == 1) | |
777 | sctp_transport_immediate_rtx(t); | |
1da177e4 LT |
778 | } |
779 | ||
1da177e4 LT |
780 | |
781 | /* Helper function to process the process SACK command. */ | |
782 | static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, | |
783 | struct sctp_association *asoc, | |
edfee033 | 784 | struct sctp_chunk *chunk) |
1da177e4 | 785 | { |
2e3216cd | 786 | int err = 0; |
1da177e4 | 787 | |
edfee033 | 788 | if (sctp_outq_sack(&asoc->outqueue, chunk)) { |
55e26eb9 EB |
789 | struct net *net = sock_net(asoc->base.sk); |
790 | ||
1da177e4 | 791 | /* There are no more TSNs awaiting SACK. */ |
55e26eb9 | 792 | err = sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
1da177e4 LT |
793 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
794 | asoc->state, asoc->ep, asoc, NULL, | |
795 | GFP_ATOMIC); | |
1da177e4 LT |
796 | } |
797 | ||
798 | return err; | |
799 | } | |
800 | ||
801 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set | |
802 | * the transport for a shutdown chunk. | |
803 | */ | |
d808ad9a | 804 | static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
805 | struct sctp_association *asoc, |
806 | struct sctp_chunk *chunk) | |
807 | { | |
808 | struct sctp_transport *t; | |
809 | ||
c17b02b3 VY |
810 | if (chunk->transport) |
811 | t = chunk->transport; | |
812 | else { | |
813 | t = sctp_assoc_choose_alter_transport(asoc, | |
9919b455 | 814 | asoc->shutdown_last_sent_to); |
c17b02b3 VY |
815 | chunk->transport = t; |
816 | } | |
1da177e4 LT |
817 | asoc->shutdown_last_sent_to = t; |
818 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; | |
1da177e4 LT |
819 | } |
820 | ||
5ee8aa68 XL |
821 | static void sctp_cmd_assoc_update(sctp_cmd_seq_t *cmds, |
822 | struct sctp_association *asoc, | |
823 | struct sctp_association *new) | |
824 | { | |
825 | struct net *net = sock_net(asoc->base.sk); | |
826 | struct sctp_chunk *abort; | |
827 | ||
828 | if (!sctp_assoc_update(asoc, new)) | |
829 | return; | |
830 | ||
831 | abort = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t)); | |
832 | if (abort) { | |
833 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); | |
834 | sctp_add_cmd_sf(cmds, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
835 | } | |
836 | sctp_add_cmd_sf(cmds, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED)); | |
837 | sctp_add_cmd_sf(cmds, SCTP_CMD_ASSOC_FAILED, | |
838 | SCTP_PERR(SCTP_ERROR_RSRC_LOW)); | |
839 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
840 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
841 | } | |
842 | ||
1da177e4 | 843 | /* Helper function to change the state of an association. */ |
d808ad9a | 844 | static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, |
1da177e4 LT |
845 | struct sctp_association *asoc, |
846 | sctp_state_t state) | |
847 | { | |
848 | struct sock *sk = asoc->base.sk; | |
849 | ||
850 | asoc->state = state; | |
851 | ||
bb33381d | 852 | pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]); |
3f7a87d2 | 853 | |
1da177e4 | 854 | if (sctp_style(sk, TCP)) { |
3f7a87d2 | 855 | /* Change the sk->sk_state of a TCP-style socket that has |
af901ca1 | 856 | * successfully completed a connect() call. |
1da177e4 LT |
857 | */ |
858 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) | |
859 | sk->sk_state = SCTP_SS_ESTABLISHED; | |
860 | ||
861 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ | |
862 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && | |
d46e416c XL |
863 | sctp_sstate(sk, ESTABLISHED)) { |
864 | sk->sk_state = SCTP_SS_CLOSING; | |
1da177e4 | 865 | sk->sk_shutdown |= RCV_SHUTDOWN; |
d46e416c | 866 | } |
1da177e4 LT |
867 | } |
868 | ||
3f7a87d2 FF |
869 | if (sctp_state(asoc, COOKIE_WAIT)) { |
870 | /* Reset init timeouts since they may have been | |
871 | * increased due to timer expirations. | |
872 | */ | |
873 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = | |
1e7d3d90 | 874 | asoc->rto_initial; |
3f7a87d2 | 875 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
1e7d3d90 | 876 | asoc->rto_initial; |
3f7a87d2 FF |
877 | } |
878 | ||
1da177e4 LT |
879 | if (sctp_state(asoc, ESTABLISHED) || |
880 | sctp_state(asoc, CLOSED) || | |
881 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { | |
882 | /* Wake up any processes waiting in the asoc's wait queue in | |
883 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). | |
d808ad9a | 884 | */ |
1da177e4 LT |
885 | if (waitqueue_active(&asoc->wait)) |
886 | wake_up_interruptible(&asoc->wait); | |
887 | ||
888 | /* Wake up any processes waiting in the sk's sleep queue of | |
889 | * a TCP-style or UDP-style peeled-off socket in | |
890 | * sctp_wait_for_accept() or sctp_wait_for_packet(). | |
891 | * For a UDP-style socket, the waiters are woken up by the | |
892 | * notifications. | |
893 | */ | |
894 | if (!sctp_style(sk, UDP)) | |
895 | sk->sk_state_change(sk); | |
896 | } | |
b7018d0b XL |
897 | |
898 | if (sctp_state(asoc, SHUTDOWN_PENDING) && | |
899 | !sctp_outq_is_empty(&asoc->outqueue)) | |
900 | sctp_outq_uncork(&asoc->outqueue, GFP_ATOMIC); | |
1da177e4 LT |
901 | } |
902 | ||
903 | /* Helper function to delete an association. */ | |
904 | static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, | |
905 | struct sctp_association *asoc) | |
906 | { | |
907 | struct sock *sk = asoc->base.sk; | |
908 | ||
909 | /* If it is a non-temporary association belonging to a TCP-style | |
d808ad9a | 910 | * listening socket that is not closed, do not free it so that accept() |
1da177e4 | 911 | * can pick it up later. |
d808ad9a | 912 | */ |
1da177e4 LT |
913 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
914 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) | |
915 | return; | |
916 | ||
1da177e4 LT |
917 | sctp_association_free(asoc); |
918 | } | |
919 | ||
920 | /* | |
921 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
922 | * A4) Start a T-4 RTO timer, using the RTO value of the selected | |
923 | * destination address (we use active path instead of primary path just | |
d808ad9a | 924 | * because primary path may be inactive. |
1da177e4 LT |
925 | */ |
926 | static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, | |
927 | struct sctp_association *asoc, | |
928 | struct sctp_chunk *chunk) | |
929 | { | |
930 | struct sctp_transport *t; | |
931 | ||
9919b455 | 932 | t = sctp_assoc_choose_alter_transport(asoc, chunk->transport); |
1da177e4 LT |
933 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
934 | chunk->transport = t; | |
935 | } | |
936 | ||
d808ad9a | 937 | /* Process an incoming Operation Error Chunk. */ |
1da177e4 LT |
938 | static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, |
939 | struct sctp_association *asoc, | |
940 | struct sctp_chunk *chunk) | |
941 | { | |
1da177e4 | 942 | struct sctp_errhdr *err_hdr; |
3df26787 WY |
943 | struct sctp_ulpevent *ev; |
944 | ||
945 | while (chunk->chunk_end > chunk->skb->data) { | |
946 | err_hdr = (struct sctp_errhdr *)(chunk->skb->data); | |
947 | ||
948 | ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, | |
949 | GFP_ATOMIC); | |
950 | if (!ev) | |
951 | return; | |
952 | ||
953 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
954 | ||
955 | switch (err_hdr->cause) { | |
956 | case SCTP_ERROR_UNKNOWN_CHUNK: | |
957 | { | |
922dbc5b | 958 | struct sctp_chunkhdr *unk_chunk_hdr; |
3df26787 | 959 | |
922dbc5b XL |
960 | unk_chunk_hdr = (struct sctp_chunkhdr *) |
961 | err_hdr->variable; | |
3df26787 WY |
962 | switch (unk_chunk_hdr->type) { |
963 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with | |
964 | * an ERROR chunk reporting that it did not recognized | |
965 | * the ASCONF chunk type, the sender of the ASCONF MUST | |
966 | * NOT send any further ASCONF chunks and MUST stop its | |
967 | * T-4 timer. | |
968 | */ | |
969 | case SCTP_CID_ASCONF: | |
970 | if (asoc->peer.asconf_capable == 0) | |
971 | break; | |
972 | ||
973 | asoc->peer.asconf_capable = 0; | |
974 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, | |
1da177e4 | 975 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
3df26787 WY |
976 | break; |
977 | default: | |
978 | break; | |
979 | } | |
1da177e4 | 980 | break; |
3df26787 | 981 | } |
1da177e4 LT |
982 | default: |
983 | break; | |
984 | } | |
1da177e4 LT |
985 | } |
986 | } | |
987 | ||
988 | /* Process variable FWDTSN chunk information. */ | |
d808ad9a | 989 | static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, |
1da177e4 LT |
990 | struct sctp_chunk *chunk) |
991 | { | |
992 | struct sctp_fwdtsn_skip *skip; | |
993 | /* Walk through all the skipped SSNs */ | |
994 | sctp_walk_fwdtsn(skip, chunk) { | |
995 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); | |
996 | } | |
1da177e4 LT |
997 | } |
998 | ||
d808ad9a | 999 | /* Helper function to remove the association non-primary peer |
1da177e4 | 1000 | * transports. |
d808ad9a | 1001 | */ |
1da177e4 LT |
1002 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
1003 | { | |
1004 | struct sctp_transport *t; | |
1005 | struct list_head *pos; | |
1006 | struct list_head *temp; | |
1007 | ||
1008 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
1009 | t = list_entry(pos, struct sctp_transport, transports); | |
5f242a13 | 1010 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
d808ad9a | 1011 | &asoc->peer.primary_addr)) { |
73e67420 | 1012 | sctp_assoc_rm_peer(asoc, t); |
1da177e4 LT |
1013 | } |
1014 | } | |
1da177e4 LT |
1015 | } |
1016 | ||
8de8c873 SS |
1017 | /* Helper function to set sk_err on a 1-1 style socket. */ |
1018 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) | |
1019 | { | |
1020 | struct sock *sk = asoc->base.sk; | |
1021 | ||
1022 | if (!sctp_style(sk, UDP)) | |
1023 | sk->sk_err = error; | |
1024 | } | |
1025 | ||
07d93967 VY |
1026 | /* Helper function to generate an association change event */ |
1027 | static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands, | |
1028 | struct sctp_association *asoc, | |
1029 | u8 state) | |
1030 | { | |
1031 | struct sctp_ulpevent *ev; | |
1032 | ||
1033 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, | |
1034 | asoc->c.sinit_num_ostreams, | |
1035 | asoc->c.sinit_max_instreams, | |
1036 | NULL, GFP_ATOMIC); | |
1037 | if (ev) | |
1038 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
1039 | } | |
1040 | ||
1041 | /* Helper function to generate an adaptation indication event */ | |
1042 | static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands, | |
1043 | struct sctp_association *asoc) | |
1044 | { | |
1045 | struct sctp_ulpevent *ev; | |
1046 | ||
1047 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1048 | ||
1049 | if (ev) | |
1050 | sctp_ulpq_tail_event(&asoc->ulpq, ev); | |
1051 | } | |
1052 | ||
96cd0d3d VY |
1053 | |
1054 | static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, | |
1055 | sctp_event_timeout_t timer, | |
1056 | char *name) | |
1057 | { | |
1058 | struct sctp_transport *t; | |
1059 | ||
1060 | t = asoc->init_last_sent_to; | |
1061 | asoc->init_err_counter++; | |
1062 | ||
1063 | if (t->init_sent_count > (asoc->init_cycle + 1)) { | |
1064 | asoc->timeouts[timer] *= 2; | |
1065 | if (asoc->timeouts[timer] > asoc->max_init_timeo) { | |
1066 | asoc->timeouts[timer] = asoc->max_init_timeo; | |
1067 | } | |
1068 | asoc->init_cycle++; | |
bb33381d DB |
1069 | |
1070 | pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d" | |
1071 | " cycle:%d timeout:%ld\n", __func__, name, | |
1072 | asoc->init_err_counter, asoc->init_cycle, | |
1073 | asoc->timeouts[timer]); | |
96cd0d3d VY |
1074 | } |
1075 | ||
1076 | } | |
1077 | ||
9c5c62be VY |
1078 | /* Send the whole message, chunk by chunk, to the outqueue. |
1079 | * This way the whole message is queued up and bundling if | |
1080 | * encouraged for small fragments. | |
1081 | */ | |
66388f2c XL |
1082 | static void sctp_cmd_send_msg(struct sctp_association *asoc, |
1083 | struct sctp_datamsg *msg, gfp_t gfp) | |
9c5c62be VY |
1084 | { |
1085 | struct sctp_chunk *chunk; | |
9c5c62be | 1086 | |
66388f2c XL |
1087 | list_for_each_entry(chunk, &msg->chunks, frag_list) |
1088 | sctp_outq_tail(&asoc->outqueue, chunk, gfp); | |
9c5c62be VY |
1089 | } |
1090 | ||
1091 | ||
c0786693 VY |
1092 | /* Sent the next ASCONF packet currently stored in the association. |
1093 | * This happens after the ASCONF_ACK was succeffully processed. | |
1094 | */ | |
1095 | static void sctp_cmd_send_asconf(struct sctp_association *asoc) | |
1096 | { | |
55e26eb9 EB |
1097 | struct net *net = sock_net(asoc->base.sk); |
1098 | ||
c0786693 VY |
1099 | /* Send the next asconf chunk from the addip chunk |
1100 | * queue. | |
1101 | */ | |
1102 | if (!list_empty(&asoc->addip_chunk_list)) { | |
1103 | struct list_head *entry = asoc->addip_chunk_list.next; | |
1104 | struct sctp_chunk *asconf = list_entry(entry, | |
1105 | struct sctp_chunk, list); | |
1106 | list_del_init(entry); | |
1107 | ||
1108 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
1109 | sctp_chunk_hold(asconf); | |
55e26eb9 | 1110 | if (sctp_primitive_ASCONF(net, asoc, asconf)) |
c0786693 VY |
1111 | sctp_chunk_free(asconf); |
1112 | else | |
1113 | asoc->addip_last_asconf = asconf; | |
1114 | } | |
1115 | } | |
1116 | ||
9c5c62be | 1117 | |
1da177e4 LT |
1118 | /* These three macros allow us to pull the debugging code out of the |
1119 | * main flow of sctp_do_sm() to keep attention focused on the real | |
1120 | * functionality there. | |
1121 | */ | |
bb33381d DB |
1122 | #define debug_pre_sfn() \ |
1123 | pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \ | |
1124 | ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \ | |
1125 | asoc, sctp_state_tbl[state], state_fn->name) | |
1126 | ||
1127 | #define debug_post_sfn() \ | |
1128 | pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \ | |
1129 | sctp_status_tbl[status]) | |
1130 | ||
1131 | #define debug_post_sfx() \ | |
1132 | pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \ | |
1133 | asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ | |
1134 | sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED]) | |
1da177e4 LT |
1135 | |
1136 | /* | |
1137 | * This is the master state machine processing function. | |
1138 | * | |
1139 | * If you want to understand all of lksctp, this is a | |
1140 | * good place to start. | |
1141 | */ | |
55e26eb9 | 1142 | int sctp_do_sm(struct net *net, sctp_event_t event_type, sctp_subtype_t subtype, |
1da177e4 LT |
1143 | sctp_state_t state, |
1144 | struct sctp_endpoint *ep, | |
1145 | struct sctp_association *asoc, | |
1146 | void *event_arg, | |
dd0fc66f | 1147 | gfp_t gfp) |
1da177e4 LT |
1148 | { |
1149 | sctp_cmd_seq_t commands; | |
1150 | const sctp_sm_table_entry_t *state_fn; | |
1151 | sctp_disposition_t status; | |
1152 | int error = 0; | |
1153 | typedef const char *(printfn_t)(sctp_subtype_t); | |
1da177e4 LT |
1154 | static printfn_t *table[] = { |
1155 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, | |
1156 | }; | |
1157 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; | |
1158 | ||
1159 | /* Look up the state function, run it, and then process the | |
1160 | * side effects. These three steps are the heart of lksctp. | |
1161 | */ | |
55e26eb9 | 1162 | state_fn = sctp_sm_lookup_event(net, event_type, state, subtype); |
1da177e4 LT |
1163 | |
1164 | sctp_init_cmd_seq(&commands); | |
1165 | ||
bb33381d | 1166 | debug_pre_sfn(); |
131334d0 | 1167 | status = state_fn->fn(net, ep, asoc, subtype, event_arg, &commands); |
bb33381d | 1168 | debug_post_sfn(); |
1da177e4 LT |
1169 | |
1170 | error = sctp_side_effects(event_type, subtype, state, | |
649621e3 | 1171 | ep, &asoc, event_arg, status, |
1da177e4 | 1172 | &commands, gfp); |
bb33381d | 1173 | debug_post_sfx(); |
1da177e4 LT |
1174 | |
1175 | return error; | |
1176 | } | |
1177 | ||
1da177e4 LT |
1178 | /***************************************************************** |
1179 | * This the master state function side effect processing function. | |
1180 | *****************************************************************/ | |
1181 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, | |
1182 | sctp_state_t state, | |
1183 | struct sctp_endpoint *ep, | |
649621e3 | 1184 | struct sctp_association **asoc, |
1da177e4 LT |
1185 | void *event_arg, |
1186 | sctp_disposition_t status, | |
1187 | sctp_cmd_seq_t *commands, | |
dd0fc66f | 1188 | gfp_t gfp) |
1da177e4 LT |
1189 | { |
1190 | int error; | |
1191 | ||
1192 | /* FIXME - Most of the dispositions left today would be categorized | |
1193 | * as "exceptional" dispositions. For those dispositions, it | |
1194 | * may not be proper to run through any of the commands at all. | |
1195 | * For example, the command interpreter might be run only with | |
1196 | * disposition SCTP_DISPOSITION_CONSUME. | |
1197 | */ | |
1198 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, | |
649621e3 | 1199 | ep, *asoc, |
1da177e4 LT |
1200 | event_arg, status, |
1201 | commands, gfp))) | |
1202 | goto bail; | |
1203 | ||
1204 | switch (status) { | |
1205 | case SCTP_DISPOSITION_DISCARD: | |
bb33381d DB |
1206 | pr_debug("%s: ignored sctp protocol event - state:%d, " |
1207 | "event_type:%d, event_id:%d\n", __func__, state, | |
1208 | event_type, subtype.chunk); | |
1da177e4 LT |
1209 | break; |
1210 | ||
1211 | case SCTP_DISPOSITION_NOMEM: | |
1212 | /* We ran out of memory, so we need to discard this | |
1213 | * packet. | |
1214 | */ | |
1215 | /* BUG--we should now recover some memory, probably by | |
1216 | * reneging... | |
1217 | */ | |
1218 | error = -ENOMEM; | |
1219 | break; | |
1220 | ||
d808ad9a | 1221 | case SCTP_DISPOSITION_DELETE_TCB: |
649621e3 | 1222 | case SCTP_DISPOSITION_ABORT: |
1da177e4 | 1223 | /* This should now be a command. */ |
649621e3 | 1224 | *asoc = NULL; |
1da177e4 LT |
1225 | break; |
1226 | ||
1227 | case SCTP_DISPOSITION_CONSUME: | |
1da177e4 LT |
1228 | /* |
1229 | * We should no longer have much work to do here as the | |
1230 | * real work has been done as explicit commands above. | |
1231 | */ | |
1232 | break; | |
1233 | ||
1234 | case SCTP_DISPOSITION_VIOLATION: | |
e87cc472 JP |
1235 | net_err_ratelimited("protocol violation state %d chunkid %d\n", |
1236 | state, subtype.chunk); | |
1da177e4 LT |
1237 | break; |
1238 | ||
1239 | case SCTP_DISPOSITION_NOT_IMPL: | |
145ce502 JP |
1240 | pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n", |
1241 | state, event_type, subtype.chunk); | |
1da177e4 LT |
1242 | break; |
1243 | ||
1244 | case SCTP_DISPOSITION_BUG: | |
145ce502 | 1245 | pr_err("bug in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1246 | state, event_type, subtype.chunk); |
1247 | BUG(); | |
1248 | break; | |
1249 | ||
1250 | default: | |
145ce502 | 1251 | pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1252 | status, state, event_type, subtype.chunk); |
1253 | BUG(); | |
1254 | break; | |
3ff50b79 | 1255 | } |
1da177e4 LT |
1256 | |
1257 | bail: | |
1258 | return error; | |
1259 | } | |
1260 | ||
1261 | /******************************************************************** | |
1262 | * 2nd Level Abstractions | |
1263 | ********************************************************************/ | |
1264 | ||
1265 | /* This is the side-effect interpreter. */ | |
1266 | static int sctp_cmd_interpreter(sctp_event_t event_type, | |
1267 | sctp_subtype_t subtype, | |
1268 | sctp_state_t state, | |
1269 | struct sctp_endpoint *ep, | |
1270 | struct sctp_association *asoc, | |
1271 | void *event_arg, | |
d808ad9a | 1272 | sctp_disposition_t status, |
1da177e4 | 1273 | sctp_cmd_seq_t *commands, |
dd0fc66f | 1274 | gfp_t gfp) |
1da177e4 | 1275 | { |
fb586f25 MRL |
1276 | struct sock *sk = ep->base.sk; |
1277 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 LT |
1278 | int error = 0; |
1279 | int force; | |
1280 | sctp_cmd_t *cmd; | |
1281 | struct sctp_chunk *new_obj; | |
1282 | struct sctp_chunk *chunk = NULL; | |
1283 | struct sctp_packet *packet; | |
1da177e4 LT |
1284 | struct timer_list *timer; |
1285 | unsigned long timeout; | |
1286 | struct sctp_transport *t; | |
1287 | struct sctp_sackhdr sackh; | |
1288 | int local_cork = 0; | |
1289 | ||
1290 | if (SCTP_EVENT_T_TIMEOUT != event_type) | |
ea110733 | 1291 | chunk = event_arg; |
1da177e4 LT |
1292 | |
1293 | /* Note: This whole file is a huge candidate for rework. | |
1294 | * For example, each command could either have its own handler, so | |
1295 | * the loop would look like: | |
1296 | * while (cmds) | |
1297 | * cmd->handle(x, y, z) | |
1298 | * --jgrimm | |
1299 | */ | |
1300 | while (NULL != (cmd = sctp_next_cmd(commands))) { | |
1301 | switch (cmd->verb) { | |
1302 | case SCTP_CMD_NOP: | |
1303 | /* Do nothing. */ | |
1304 | break; | |
1305 | ||
1306 | case SCTP_CMD_NEW_ASOC: | |
1307 | /* Register a new association. */ | |
1308 | if (local_cork) { | |
cea8768f | 1309 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1310 | local_cork = 0; |
1311 | } | |
f9e42b85 | 1312 | |
1da177e4 | 1313 | /* Register with the endpoint. */ |
f9e42b85 DB |
1314 | asoc = cmd->obj.asoc; |
1315 | BUG_ON(asoc->peer.primary_path == NULL); | |
1da177e4 | 1316 | sctp_endpoint_add_asoc(ep, asoc); |
1da177e4 LT |
1317 | break; |
1318 | ||
1319 | case SCTP_CMD_UPDATE_ASSOC: | |
5ee8aa68 | 1320 | sctp_cmd_assoc_update(commands, asoc, cmd->obj.asoc); |
1da177e4 LT |
1321 | break; |
1322 | ||
1323 | case SCTP_CMD_PURGE_OUTQUEUE: | |
1324 | sctp_outq_teardown(&asoc->outqueue); | |
1325 | break; | |
1326 | ||
d808ad9a | 1327 | case SCTP_CMD_DELETE_TCB: |
1da177e4 | 1328 | if (local_cork) { |
cea8768f | 1329 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1330 | local_cork = 0; |
1331 | } | |
1332 | /* Delete the current association. */ | |
1333 | sctp_cmd_delete_tcb(commands, asoc); | |
1334 | asoc = NULL; | |
1335 | break; | |
1336 | ||
1337 | case SCTP_CMD_NEW_STATE: | |
1338 | /* Enter a new state. */ | |
1339 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); | |
1340 | break; | |
1341 | ||
1342 | case SCTP_CMD_REPORT_TSN: | |
1343 | /* Record the arrival of a TSN. */ | |
8e1ee18c | 1344 | error = sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d | 1345 | cmd->obj.u32, NULL); |
1da177e4 LT |
1346 | break; |
1347 | ||
1348 | case SCTP_CMD_REPORT_FWDTSN: | |
1349 | /* Move the Cumulattive TSN Ack ahead. */ | |
1350 | sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); | |
1351 | ||
ea2dfb37 VY |
1352 | /* purge the fragmentation queue */ |
1353 | sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32); | |
1354 | ||
1da177e4 LT |
1355 | /* Abort any in progress partial delivery. */ |
1356 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); | |
1357 | break; | |
1358 | ||
1359 | case SCTP_CMD_PROCESS_FWDTSN: | |
b26ddd81 | 1360 | sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.chunk); |
d808ad9a | 1361 | break; |
1da177e4 LT |
1362 | |
1363 | case SCTP_CMD_GEN_SACK: | |
1364 | /* Generate a Selective ACK. | |
1365 | * The argument tells us whether to just count | |
1366 | * the packet and MAYBE generate a SACK, or | |
1367 | * force a SACK out. | |
1368 | */ | |
1369 | force = cmd->obj.i32; | |
1370 | error = sctp_gen_sack(asoc, force, commands); | |
1371 | break; | |
1372 | ||
1373 | case SCTP_CMD_PROCESS_SACK: | |
1374 | /* Process an inbound SACK. */ | |
1375 | error = sctp_cmd_process_sack(commands, asoc, | |
b26ddd81 | 1376 | cmd->obj.chunk); |
1da177e4 LT |
1377 | break; |
1378 | ||
1379 | case SCTP_CMD_GEN_INIT_ACK: | |
1380 | /* Generate an INIT ACK chunk. */ | |
1381 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, | |
1382 | 0); | |
1383 | if (!new_obj) | |
1384 | goto nomem; | |
1385 | ||
1386 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1387 | SCTP_CHUNK(new_obj)); | |
1388 | break; | |
1389 | ||
1390 | case SCTP_CMD_PEER_INIT: | |
1391 | /* Process a unified INIT from the peer. | |
1392 | * Note: Only used during INIT-ACK processing. If | |
1393 | * there is an error just return to the outter | |
1394 | * layer which will bail. | |
1395 | */ | |
1396 | error = sctp_cmd_process_init(commands, asoc, chunk, | |
b26ddd81 | 1397 | cmd->obj.init, gfp); |
1da177e4 LT |
1398 | break; |
1399 | ||
1400 | case SCTP_CMD_GEN_COOKIE_ECHO: | |
1401 | /* Generate a COOKIE ECHO chunk. */ | |
1402 | new_obj = sctp_make_cookie_echo(asoc, chunk); | |
1403 | if (!new_obj) { | |
b26ddd81 NH |
1404 | if (cmd->obj.chunk) |
1405 | sctp_chunk_free(cmd->obj.chunk); | |
1da177e4 LT |
1406 | goto nomem; |
1407 | } | |
1408 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1409 | SCTP_CHUNK(new_obj)); | |
1410 | ||
1411 | /* If there is an ERROR chunk to be sent along with | |
1412 | * the COOKIE_ECHO, send it, too. | |
1413 | */ | |
b26ddd81 | 1414 | if (cmd->obj.chunk) |
1da177e4 | 1415 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
b26ddd81 | 1416 | SCTP_CHUNK(cmd->obj.chunk)); |
1da177e4 | 1417 | |
96cd0d3d VY |
1418 | if (new_obj->transport) { |
1419 | new_obj->transport->init_sent_count++; | |
1420 | asoc->init_last_sent_to = new_obj->transport; | |
1421 | } | |
1422 | ||
1da177e4 | 1423 | /* FIXME - Eventually come up with a cleaner way to |
d808ad9a YH |
1424 | * enabling COOKIE-ECHO + DATA bundling during |
1425 | * multihoming stale cookie scenarios, the following | |
1426 | * command plays with asoc->peer.retran_path to | |
1427 | * avoid the problem of sending the COOKIE-ECHO and | |
1428 | * DATA in different paths, which could result | |
1429 | * in the association being ABORTed if the DATA chunk | |
1da177e4 LT |
1430 | * is processed first by the server. Checking the |
1431 | * init error counter simply causes this command | |
1432 | * to be executed only during failed attempts of | |
1433 | * association establishment. | |
1434 | */ | |
3f7a87d2 FF |
1435 | if ((asoc->peer.retran_path != |
1436 | asoc->peer.primary_path) && | |
1437 | (asoc->init_err_counter > 0)) { | |
1438 | sctp_add_cmd_sf(commands, | |
d808ad9a | 1439 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1da177e4 LT |
1440 | SCTP_NULL()); |
1441 | } | |
1442 | ||
1443 | break; | |
1444 | ||
1445 | case SCTP_CMD_GEN_SHUTDOWN: | |
1446 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. | |
1447 | * Reset error counts. | |
1448 | */ | |
1449 | asoc->overall_error_count = 0; | |
1450 | ||
1451 | /* Generate a SHUTDOWN chunk. */ | |
1452 | new_obj = sctp_make_shutdown(asoc, chunk); | |
1453 | if (!new_obj) | |
1454 | goto nomem; | |
1455 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1456 | SCTP_CHUNK(new_obj)); | |
1457 | break; | |
1458 | ||
1459 | case SCTP_CMD_CHUNK_ULP: | |
1460 | /* Send a chunk to the sockets layer. */ | |
bb33381d DB |
1461 | pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n", |
1462 | __func__, cmd->obj.chunk, &asoc->ulpq); | |
1463 | ||
b26ddd81 | 1464 | sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1465 | GFP_ATOMIC); |
1466 | break; | |
1467 | ||
1468 | case SCTP_CMD_EVENT_ULP: | |
1469 | /* Send a notification to the sockets layer. */ | |
bb33381d DB |
1470 | pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n", |
1471 | __func__, cmd->obj.ulpevent, &asoc->ulpq); | |
1472 | ||
b26ddd81 | 1473 | sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ulpevent); |
1da177e4 LT |
1474 | break; |
1475 | ||
1476 | case SCTP_CMD_REPLY: | |
1477 | /* If an caller has not already corked, do cork. */ | |
1478 | if (!asoc->outqueue.cork) { | |
1479 | sctp_outq_cork(&asoc->outqueue); | |
1480 | local_cork = 1; | |
1481 | } | |
1482 | /* Send a chunk to our peer. */ | |
83dbc3d4 | 1483 | sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk, gfp); |
1da177e4 LT |
1484 | break; |
1485 | ||
1486 | case SCTP_CMD_SEND_PKT: | |
1487 | /* Send a full packet to our peer. */ | |
b26ddd81 | 1488 | packet = cmd->obj.packet; |
cea8768f | 1489 | sctp_packet_transmit(packet, gfp); |
1da177e4 LT |
1490 | sctp_ootb_pkt_free(packet); |
1491 | break; | |
1492 | ||
b6157d8e VY |
1493 | case SCTP_CMD_T1_RETRAN: |
1494 | /* Mark a transport for retransmission. */ | |
1495 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1496 | SCTP_RTXR_T1_RTX); | |
1497 | break; | |
1498 | ||
1da177e4 LT |
1499 | case SCTP_CMD_RETRAN: |
1500 | /* Mark a transport for retransmission. */ | |
1501 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1502 | SCTP_RTXR_T3_RTX); | |
1503 | break; | |
1504 | ||
1da177e4 LT |
1505 | case SCTP_CMD_ECN_CE: |
1506 | /* Do delayed CE processing. */ | |
1507 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); | |
1508 | break; | |
1509 | ||
1510 | case SCTP_CMD_ECN_ECNE: | |
1511 | /* Do delayed ECNE processing. */ | |
1512 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, | |
1513 | chunk); | |
1514 | if (new_obj) | |
1515 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1516 | SCTP_CHUNK(new_obj)); | |
1517 | break; | |
1518 | ||
1519 | case SCTP_CMD_ECN_CWR: | |
1520 | /* Do delayed CWR processing. */ | |
1521 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); | |
1522 | break; | |
1523 | ||
1524 | case SCTP_CMD_SETUP_T2: | |
b26ddd81 | 1525 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1526 | break; |
1527 | ||
f8d96052 TG |
1528 | case SCTP_CMD_TIMER_START_ONCE: |
1529 | timer = &asoc->timers[cmd->obj.to]; | |
1530 | ||
1531 | if (timer_pending(timer)) | |
1532 | break; | |
1533 | /* fall through */ | |
1534 | ||
1da177e4 LT |
1535 | case SCTP_CMD_TIMER_START: |
1536 | timer = &asoc->timers[cmd->obj.to]; | |
1537 | timeout = asoc->timeouts[cmd->obj.to]; | |
09a62660 | 1538 | BUG_ON(!timeout); |
1da177e4 LT |
1539 | |
1540 | timer->expires = jiffies + timeout; | |
1541 | sctp_association_hold(asoc); | |
1542 | add_timer(timer); | |
1543 | break; | |
1544 | ||
1545 | case SCTP_CMD_TIMER_RESTART: | |
1546 | timer = &asoc->timers[cmd->obj.to]; | |
1547 | timeout = asoc->timeouts[cmd->obj.to]; | |
1548 | if (!mod_timer(timer, jiffies + timeout)) | |
1549 | sctp_association_hold(asoc); | |
1550 | break; | |
1551 | ||
1552 | case SCTP_CMD_TIMER_STOP: | |
1553 | timer = &asoc->timers[cmd->obj.to]; | |
25cc4ae9 | 1554 | if (del_timer(timer)) |
1da177e4 LT |
1555 | sctp_association_put(asoc); |
1556 | break; | |
1557 | ||
3f7a87d2 | 1558 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
b26ddd81 | 1559 | chunk = cmd->obj.chunk; |
9919b455 WY |
1560 | t = sctp_assoc_choose_alter_transport(asoc, |
1561 | asoc->init_last_sent_to); | |
3f7a87d2 FF |
1562 | asoc->init_last_sent_to = t; |
1563 | chunk->transport = t; | |
1564 | t->init_sent_count++; | |
e0e9db17 VY |
1565 | /* Set the new transport as primary */ |
1566 | sctp_assoc_set_primary(asoc, t); | |
3f7a87d2 FF |
1567 | break; |
1568 | ||
1da177e4 LT |
1569 | case SCTP_CMD_INIT_RESTART: |
1570 | /* Do the needed accounting and updates | |
1571 | * associated with restarting an initialization | |
3f7a87d2 FF |
1572 | * timer. Only multiply the timeout by two if |
1573 | * all transports have been tried at the current | |
1574 | * timeout. | |
1575 | */ | |
96cd0d3d VY |
1576 | sctp_cmd_t1_timer_update(asoc, |
1577 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
1578 | "INIT"); | |
3f7a87d2 FF |
1579 | |
1580 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
1581 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1582 | break; | |
1583 | ||
1584 | case SCTP_CMD_COOKIEECHO_RESTART: | |
1585 | /* Do the needed accounting and updates | |
1586 | * associated with restarting an initialization | |
1587 | * timer. Only multiply the timeout by two if | |
1588 | * all transports have been tried at the current | |
1589 | * timeout. | |
1da177e4 | 1590 | */ |
96cd0d3d VY |
1591 | sctp_cmd_t1_timer_update(asoc, |
1592 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
1593 | "COOKIE"); | |
1da177e4 LT |
1594 | |
1595 | /* If we've sent any data bundled with | |
1596 | * COOKIE-ECHO we need to resend. | |
1597 | */ | |
9dbc15f0 RD |
1598 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1599 | transports) { | |
b6157d8e VY |
1600 | sctp_retransmit_mark(&asoc->outqueue, t, |
1601 | SCTP_RTXR_T1_RTX); | |
1da177e4 LT |
1602 | } |
1603 | ||
1604 | sctp_add_cmd_sf(commands, | |
1605 | SCTP_CMD_TIMER_RESTART, | |
3f7a87d2 | 1606 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4 LT |
1607 | break; |
1608 | ||
1609 | case SCTP_CMD_INIT_FAILED: | |
dc251b2b | 1610 | sctp_cmd_init_failed(commands, asoc, cmd->obj.err); |
1da177e4 LT |
1611 | break; |
1612 | ||
1613 | case SCTP_CMD_ASSOC_FAILED: | |
1614 | sctp_cmd_assoc_failed(commands, asoc, event_type, | |
5be291fe | 1615 | subtype, chunk, cmd->obj.err); |
1da177e4 LT |
1616 | break; |
1617 | ||
3f7a87d2 FF |
1618 | case SCTP_CMD_INIT_COUNTER_INC: |
1619 | asoc->init_err_counter++; | |
1da177e4 LT |
1620 | break; |
1621 | ||
3f7a87d2 FF |
1622 | case SCTP_CMD_INIT_COUNTER_RESET: |
1623 | asoc->init_err_counter = 0; | |
1624 | asoc->init_cycle = 0; | |
96cd0d3d VY |
1625 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1626 | transports) { | |
1627 | t->init_sent_count = 0; | |
1628 | } | |
1da177e4 LT |
1629 | break; |
1630 | ||
1631 | case SCTP_CMD_REPORT_DUP: | |
1632 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, | |
1633 | cmd->obj.u32); | |
1634 | break; | |
1635 | ||
1636 | case SCTP_CMD_REPORT_BAD_TAG: | |
bb33381d | 1637 | pr_debug("%s: vtag mismatch!\n", __func__); |
1da177e4 LT |
1638 | break; |
1639 | ||
1640 | case SCTP_CMD_STRIKE: | |
1641 | /* Mark one strike against a transport. */ | |
5aa93bcf NH |
1642 | sctp_do_8_2_transport_strike(commands, asoc, |
1643 | cmd->obj.transport, 0); | |
7e99013a VY |
1644 | break; |
1645 | ||
1646 | case SCTP_CMD_TRANSPORT_IDLE: | |
1647 | t = cmd->obj.transport; | |
1648 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); | |
1da177e4 LT |
1649 | break; |
1650 | ||
7e99013a | 1651 | case SCTP_CMD_TRANSPORT_HB_SENT: |
1da177e4 | 1652 | t = cmd->obj.transport; |
5aa93bcf NH |
1653 | sctp_do_8_2_transport_strike(commands, asoc, |
1654 | t, 1); | |
7e99013a | 1655 | t->hb_sent = 1; |
1da177e4 LT |
1656 | break; |
1657 | ||
1658 | case SCTP_CMD_TRANSPORT_ON: | |
1659 | t = cmd->obj.transport; | |
1660 | sctp_cmd_transport_on(commands, asoc, t, chunk); | |
1661 | break; | |
1662 | ||
1663 | case SCTP_CMD_HB_TIMERS_START: | |
1664 | sctp_cmd_hb_timers_start(commands, asoc); | |
1665 | break; | |
1666 | ||
1667 | case SCTP_CMD_HB_TIMER_UPDATE: | |
1668 | t = cmd->obj.transport; | |
ba6f5e33 | 1669 | sctp_transport_reset_hb_timer(t); |
1da177e4 LT |
1670 | break; |
1671 | ||
1672 | case SCTP_CMD_HB_TIMERS_STOP: | |
1673 | sctp_cmd_hb_timers_stop(commands, asoc); | |
1674 | break; | |
1675 | ||
1676 | case SCTP_CMD_REPORT_ERROR: | |
1677 | error = cmd->obj.error; | |
1678 | break; | |
1679 | ||
1680 | case SCTP_CMD_PROCESS_CTSN: | |
1681 | /* Dummy up a SACK for processing. */ | |
2178eda8 | 1682 | sackh.cum_tsn_ack = cmd->obj.be32; |
d4d6fb57 VY |
1683 | sackh.a_rwnd = asoc->peer.rwnd + |
1684 | asoc->outqueue.outstanding_bytes; | |
1da177e4 LT |
1685 | sackh.num_gap_ack_blocks = 0; |
1686 | sackh.num_dup_tsns = 0; | |
f6e80abe | 1687 | chunk->subh.sack_hdr = &sackh; |
1da177e4 | 1688 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
f6e80abe | 1689 | SCTP_CHUNK(chunk)); |
1da177e4 LT |
1690 | break; |
1691 | ||
1692 | case SCTP_CMD_DISCARD_PACKET: | |
2e3216cd VY |
1693 | /* We need to discard the whole packet. |
1694 | * Uncork the queue since there might be | |
1695 | * responses pending | |
1696 | */ | |
1da177e4 | 1697 | chunk->pdiscard = 1; |
2e3216cd | 1698 | if (asoc) { |
cea8768f | 1699 | sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd VY |
1700 | local_cork = 0; |
1701 | } | |
1da177e4 LT |
1702 | break; |
1703 | ||
1704 | case SCTP_CMD_RTO_PENDING: | |
1705 | t = cmd->obj.transport; | |
1706 | t->rto_pending = 1; | |
1707 | break; | |
1708 | ||
1709 | case SCTP_CMD_PART_DELIVER: | |
b26ddd81 | 1710 | sctp_ulpq_partial_delivery(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 LT |
1711 | break; |
1712 | ||
1713 | case SCTP_CMD_RENEGE: | |
b26ddd81 | 1714 | sctp_ulpq_renege(&asoc->ulpq, cmd->obj.chunk, |
1da177e4 LT |
1715 | GFP_ATOMIC); |
1716 | break; | |
1717 | ||
1718 | case SCTP_CMD_SETUP_T4: | |
b26ddd81 | 1719 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1720 | break; |
1721 | ||
1722 | case SCTP_CMD_PROCESS_OPERR: | |
1723 | sctp_cmd_process_operr(commands, asoc, chunk); | |
1724 | break; | |
1725 | case SCTP_CMD_CLEAR_INIT_TAG: | |
1726 | asoc->peer.i.init_tag = 0; | |
1727 | break; | |
1728 | case SCTP_CMD_DEL_NON_PRIMARY: | |
1729 | sctp_cmd_del_non_primary(asoc); | |
1730 | break; | |
1731 | case SCTP_CMD_T3_RTX_TIMERS_STOP: | |
1732 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); | |
1733 | break; | |
1734 | case SCTP_CMD_FORCE_PRIM_RETRAN: | |
1735 | t = asoc->peer.retran_path; | |
1736 | asoc->peer.retran_path = asoc->peer.primary_path; | |
83dbc3d4 | 1737 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1738 | local_cork = 0; |
1739 | asoc->peer.retran_path = t; | |
1740 | break; | |
8de8c873 SS |
1741 | case SCTP_CMD_SET_SK_ERR: |
1742 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); | |
1743 | break; | |
07d93967 VY |
1744 | case SCTP_CMD_ASSOC_CHANGE: |
1745 | sctp_cmd_assoc_change(commands, asoc, | |
1746 | cmd->obj.u8); | |
1747 | break; | |
1748 | case SCTP_CMD_ADAPTATION_IND: | |
1749 | sctp_cmd_adaptation_ind(commands, asoc); | |
1750 | break; | |
1751 | ||
730fc3d0 VY |
1752 | case SCTP_CMD_ASSOC_SHKEY: |
1753 | error = sctp_auth_asoc_init_active_key(asoc, | |
1754 | GFP_ATOMIC); | |
1755 | break; | |
f4ad85ca GJ |
1756 | case SCTP_CMD_UPDATE_INITTAG: |
1757 | asoc->peer.i.init_tag = cmd->obj.u32; | |
1758 | break; | |
9c5c62be VY |
1759 | case SCTP_CMD_SEND_MSG: |
1760 | if (!asoc->outqueue.cork) { | |
1761 | sctp_outq_cork(&asoc->outqueue); | |
1762 | local_cork = 1; | |
1763 | } | |
66388f2c | 1764 | sctp_cmd_send_msg(asoc, cmd->obj.msg, gfp); |
9c5c62be | 1765 | break; |
c0786693 VY |
1766 | case SCTP_CMD_SEND_NEXT_ASCONF: |
1767 | sctp_cmd_send_asconf(asoc); | |
1768 | break; | |
a000c01e WY |
1769 | case SCTP_CMD_PURGE_ASCONF_QUEUE: |
1770 | sctp_asconf_queue_teardown(asoc); | |
1771 | break; | |
d5ccd496 MM |
1772 | |
1773 | case SCTP_CMD_SET_ASOC: | |
8cd5c25f XL |
1774 | if (asoc && local_cork) { |
1775 | sctp_outq_uncork(&asoc->outqueue, gfp); | |
1776 | local_cork = 0; | |
1777 | } | |
d5ccd496 MM |
1778 | asoc = cmd->obj.asoc; |
1779 | break; | |
1780 | ||
1da177e4 | 1781 | default: |
b26ddd81 NH |
1782 | pr_warn("Impossible command: %u\n", |
1783 | cmd->verb); | |
1da177e4 | 1784 | break; |
3ff50b79 SH |
1785 | } |
1786 | ||
1da177e4 LT |
1787 | if (error) |
1788 | break; | |
1789 | } | |
1790 | ||
1791 | out: | |
2e3216cd VY |
1792 | /* If this is in response to a received chunk, wait until |
1793 | * we are done with the packet to open the queue so that we don't | |
1794 | * send multiple packets in response to a single request. | |
1795 | */ | |
1796 | if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { | |
1797 | if (chunk->end_of_packet || chunk->singleton) | |
83dbc3d4 | 1798 | sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd | 1799 | } else if (local_cork) |
83dbc3d4 | 1800 | sctp_outq_uncork(&asoc->outqueue, gfp); |
fb586f25 | 1801 | |
0970f5b3 MRL |
1802 | if (sp->data_ready_signalled) |
1803 | sp->data_ready_signalled = 0; | |
1804 | ||
1da177e4 LT |
1805 | return error; |
1806 | nomem: | |
1807 | error = -ENOMEM; | |
1808 | goto out; | |
1809 | } | |
1810 |