Commit | Line | Data |
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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> | |
5bbbbe32 | 53 | #include <net/sctp/stream_sched.h> |
1da177e4 | 54 | |
88ee48c1 | 55 | static int sctp_cmd_interpreter(enum sctp_event_type event_type, |
bfc6f827 | 56 | union sctp_subtype subtype, |
52106019 | 57 | enum sctp_state state, |
1da177e4 LT |
58 | struct sctp_endpoint *ep, |
59 | struct sctp_association *asoc, | |
60 | void *event_arg, | |
172a1599 | 61 | enum sctp_disposition status, |
a85bbeb2 | 62 | struct sctp_cmd_seq *commands, |
dd0fc66f | 63 | gfp_t gfp); |
88ee48c1 | 64 | static int sctp_side_effects(enum sctp_event_type event_type, |
bfc6f827 | 65 | union sctp_subtype subtype, |
52106019 | 66 | enum sctp_state state, |
1da177e4 | 67 | struct sctp_endpoint *ep, |
649621e3 | 68 | struct sctp_association **asoc, |
1da177e4 | 69 | void *event_arg, |
172a1599 | 70 | enum sctp_disposition status, |
a85bbeb2 | 71 | struct sctp_cmd_seq *commands, |
dd0fc66f | 72 | gfp_t gfp); |
1da177e4 LT |
73 | |
74 | /******************************************************************** | |
75 | * Helper functions | |
76 | ********************************************************************/ | |
77 | ||
78 | /* A helper function for delayed processing of INET ECN CE bit. */ | |
d808ad9a | 79 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
1da177e4 LT |
80 | __u32 lowest_tsn) |
81 | { | |
82 | /* Save the TSN away for comparison when we receive CWR */ | |
83 | ||
84 | asoc->last_ecne_tsn = lowest_tsn; | |
85 | asoc->need_ecne = 1; | |
86 | } | |
87 | ||
88 | /* Helper function for delayed processing of SCTP ECNE chunk. */ | |
89 | /* RFC 2960 Appendix A | |
90 | * | |
91 | * RFC 2481 details a specific bit for a sender to send in | |
92 | * the header of its next outbound TCP segment to indicate to | |
93 | * its peer that it has reduced its congestion window. This | |
94 | * is termed the CWR bit. For SCTP the same indication is made | |
95 | * by including the CWR chunk. This chunk contains one data | |
96 | * element, i.e. the TSN number that was sent in the ECNE chunk. | |
97 | * This element represents the lowest TSN number in the datagram | |
98 | * that was originally marked with the CE bit. | |
99 | */ | |
100 | static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc, | |
172a1599 XL |
101 | __u32 lowest_tsn, |
102 | struct sctp_chunk *chunk) | |
1da177e4 LT |
103 | { |
104 | struct sctp_chunk *repl; | |
105 | ||
106 | /* Our previously transmitted packet ran into some congestion | |
107 | * so we should take action by reducing cwnd and ssthresh | |
108 | * and then ACK our peer that we we've done so by | |
109 | * sending a CWR. | |
110 | */ | |
111 | ||
112 | /* First, try to determine if we want to actually lower | |
113 | * our cwnd variables. Only lower them if the ECNE looks more | |
114 | * recent than the last response. | |
115 | */ | |
116 | if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) { | |
117 | struct sctp_transport *transport; | |
118 | ||
119 | /* Find which transport's congestion variables | |
120 | * need to be adjusted. | |
121 | */ | |
122 | transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn); | |
123 | ||
124 | /* Update the congestion variables. */ | |
125 | if (transport) | |
126 | sctp_transport_lower_cwnd(transport, | |
127 | SCTP_LOWER_CWND_ECNE); | |
128 | asoc->last_cwr_tsn = lowest_tsn; | |
129 | } | |
130 | ||
131 | /* Always try to quiet the other end. In case of lost CWR, | |
132 | * resend last_cwr_tsn. | |
133 | */ | |
134 | repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk); | |
135 | ||
136 | /* If we run out of memory, it will look like a lost CWR. We'll | |
137 | * get back in sync eventually. | |
138 | */ | |
139 | return repl; | |
140 | } | |
141 | ||
142 | /* Helper function to do delayed processing of ECN CWR chunk. */ | |
143 | static void sctp_do_ecn_cwr_work(struct sctp_association *asoc, | |
144 | __u32 lowest_tsn) | |
145 | { | |
146 | /* Turn off ECNE getting auto-prepended to every outgoing | |
147 | * packet | |
148 | */ | |
149 | asoc->need_ecne = 0; | |
150 | } | |
151 | ||
152 | /* Generate SACK if necessary. We call this at the end of a packet. */ | |
153 | static int sctp_gen_sack(struct sctp_association *asoc, int force, | |
a85bbeb2 | 154 | struct sctp_cmd_seq *commands) |
1da177e4 | 155 | { |
172a1599 | 156 | struct sctp_transport *trans = asoc->peer.last_data_from; |
1da177e4 LT |
157 | __u32 ctsn, max_tsn_seen; |
158 | struct sctp_chunk *sack; | |
159 | int error = 0; | |
160 | ||
d808ad9a | 161 | if (force || |
52ccb8e9 FF |
162 | (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || |
163 | (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) | |
1da177e4 LT |
164 | asoc->peer.sack_needed = 1; |
165 | ||
166 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
167 | max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); | |
168 | ||
169 | /* From 12.2 Parameters necessary per association (i.e. the TCB): | |
170 | * | |
171 | * Ack State : This flag indicates if the next received packet | |
172 | * : is to be responded to with a SACK. ... | |
173 | * : When DATA chunks are out of order, SACK's | |
174 | * : are not delayed (see Section 6). | |
175 | * | |
176 | * [This is actually not mentioned in Section 6, but we | |
177 | * implement it here anyway. --piggy] | |
178 | */ | |
d808ad9a | 179 | if (max_tsn_seen != ctsn) |
1da177e4 LT |
180 | asoc->peer.sack_needed = 1; |
181 | ||
182 | /* From 6.2 Acknowledgement on Reception of DATA Chunks: | |
183 | * | |
184 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, | |
185 | * an acknowledgement SHOULD be generated for at least every | |
186 | * second packet (not every second DATA chunk) received, and | |
187 | * SHOULD be generated within 200 ms of the arrival of any | |
188 | * unacknowledged DATA chunk. ... | |
189 | */ | |
190 | if (!asoc->peer.sack_needed) { | |
d364d927 | 191 | asoc->peer.sack_cnt++; |
52ccb8e9 FF |
192 | |
193 | /* Set the SACK delay timeout based on the | |
194 | * SACK delay for the last transport | |
195 | * data was received from, or the default | |
196 | * for the association. | |
197 | */ | |
d364d927 WY |
198 | if (trans) { |
199 | /* We will need a SACK for the next packet. */ | |
200 | if (asoc->peer.sack_cnt >= trans->sackfreq - 1) | |
201 | asoc->peer.sack_needed = 1; | |
202 | ||
d808ad9a | 203 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 204 | trans->sackdelay; |
d364d927 WY |
205 | } else { |
206 | /* We will need a SACK for the next packet. */ | |
207 | if (asoc->peer.sack_cnt >= asoc->sackfreq - 1) | |
208 | asoc->peer.sack_needed = 1; | |
209 | ||
d808ad9a | 210 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 211 | asoc->sackdelay; |
d364d927 | 212 | } |
52ccb8e9 FF |
213 | |
214 | /* Restart the SACK timer. */ | |
215 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
216 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 | 217 | } else { |
07b4d6a1 MRL |
218 | __u32 old_a_rwnd = asoc->a_rwnd; |
219 | ||
90f2f531 | 220 | asoc->a_rwnd = asoc->rwnd; |
1da177e4 | 221 | sack = sctp_make_sack(asoc); |
07b4d6a1 MRL |
222 | if (!sack) { |
223 | asoc->a_rwnd = old_a_rwnd; | |
1da177e4 | 224 | goto nomem; |
07b4d6a1 | 225 | } |
1da177e4 LT |
226 | |
227 | asoc->peer.sack_needed = 0; | |
d364d927 | 228 | asoc->peer.sack_cnt = 0; |
1da177e4 | 229 | |
732ba35e | 230 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
1da177e4 LT |
231 | |
232 | /* Stop the SACK timer. */ | |
233 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
234 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
235 | } | |
52ccb8e9 | 236 | |
1da177e4 LT |
237 | return error; |
238 | nomem: | |
239 | error = -ENOMEM; | |
240 | return error; | |
241 | } | |
242 | ||
243 | /* When the T3-RTX timer expires, it calls this function to create the | |
244 | * relevant state machine event. | |
245 | */ | |
9c3b5751 | 246 | void sctp_generate_t3_rtx_event(struct timer_list *t) |
1da177e4 | 247 | { |
9c3b5751 KC |
248 | struct sctp_transport *transport = |
249 | from_timer(transport, t, T3_rtx_timer); | |
1da177e4 | 250 | struct sctp_association *asoc = transport->asoc; |
635682a1 KH |
251 | struct sock *sk = asoc->base.sk; |
252 | struct net *net = sock_net(sk); | |
172a1599 | 253 | int error; |
1da177e4 LT |
254 | |
255 | /* Check whether a task is in the sock. */ | |
256 | ||
635682a1 KH |
257 | bh_lock_sock(sk); |
258 | if (sock_owned_by_user(sk)) { | |
bb33381d | 259 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
260 | |
261 | /* Try again later. */ | |
262 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) | |
263 | sctp_transport_hold(transport); | |
264 | goto out_unlock; | |
265 | } | |
266 | ||
1da177e4 | 267 | /* Run through the state machine. */ |
55e26eb9 | 268 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
269 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), |
270 | asoc->state, | |
271 | asoc->ep, asoc, | |
272 | transport, GFP_ATOMIC); | |
273 | ||
274 | if (error) | |
635682a1 | 275 | sk->sk_err = -error; |
1da177e4 LT |
276 | |
277 | out_unlock: | |
635682a1 | 278 | bh_unlock_sock(sk); |
1da177e4 LT |
279 | sctp_transport_put(transport); |
280 | } | |
281 | ||
282 | /* This is a sa interface for producing timeout events. It works | |
283 | * for timeouts which use the association as their parameter. | |
284 | */ | |
285 | static void sctp_generate_timeout_event(struct sctp_association *asoc, | |
19cd1592 | 286 | enum sctp_event_timeout timeout_type) |
1da177e4 | 287 | { |
635682a1 KH |
288 | struct sock *sk = asoc->base.sk; |
289 | struct net *net = sock_net(sk); | |
1da177e4 LT |
290 | int error = 0; |
291 | ||
635682a1 KH |
292 | bh_lock_sock(sk); |
293 | if (sock_owned_by_user(sk)) { | |
bb33381d DB |
294 | pr_debug("%s: sock is busy: timer %d\n", __func__, |
295 | timeout_type); | |
1da177e4 LT |
296 | |
297 | /* Try again later. */ | |
298 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) | |
299 | sctp_association_hold(asoc); | |
300 | goto out_unlock; | |
301 | } | |
302 | ||
303 | /* Is this association really dead and just waiting around for | |
304 | * the timer to let go of the reference? | |
305 | */ | |
306 | if (asoc->base.dead) | |
307 | goto out_unlock; | |
308 | ||
309 | /* Run through the state machine. */ | |
55e26eb9 | 310 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
311 | SCTP_ST_TIMEOUT(timeout_type), |
312 | asoc->state, asoc->ep, asoc, | |
313 | (void *)timeout_type, GFP_ATOMIC); | |
314 | ||
315 | if (error) | |
635682a1 | 316 | sk->sk_err = -error; |
1da177e4 LT |
317 | |
318 | out_unlock: | |
635682a1 | 319 | bh_unlock_sock(sk); |
1da177e4 LT |
320 | sctp_association_put(asoc); |
321 | } | |
322 | ||
9c3b5751 | 323 | static void sctp_generate_t1_cookie_event(struct timer_list *t) |
1da177e4 | 324 | { |
9c3b5751 KC |
325 | struct sctp_association *asoc = |
326 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T1_COOKIE]); | |
327 | ||
1da177e4 LT |
328 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); |
329 | } | |
330 | ||
9c3b5751 | 331 | static void sctp_generate_t1_init_event(struct timer_list *t) |
1da177e4 | 332 | { |
9c3b5751 KC |
333 | struct sctp_association *asoc = |
334 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T1_INIT]); | |
335 | ||
1da177e4 LT |
336 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); |
337 | } | |
338 | ||
9c3b5751 | 339 | static void sctp_generate_t2_shutdown_event(struct timer_list *t) |
1da177e4 | 340 | { |
9c3b5751 KC |
341 | struct sctp_association *asoc = |
342 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN]); | |
343 | ||
1da177e4 LT |
344 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); |
345 | } | |
346 | ||
9c3b5751 | 347 | static void sctp_generate_t4_rto_event(struct timer_list *t) |
1da177e4 | 348 | { |
9c3b5751 KC |
349 | struct sctp_association *asoc = |
350 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T4_RTO]); | |
351 | ||
1da177e4 LT |
352 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); |
353 | } | |
354 | ||
9c3b5751 | 355 | static void sctp_generate_t5_shutdown_guard_event(struct timer_list *t) |
1da177e4 | 356 | { |
9c3b5751 KC |
357 | struct sctp_association *asoc = |
358 | from_timer(asoc, t, | |
359 | timers[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD]); | |
360 | ||
d808ad9a | 361 | sctp_generate_timeout_event(asoc, |
1da177e4 LT |
362 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
363 | ||
364 | } /* sctp_generate_t5_shutdown_guard_event() */ | |
365 | ||
9c3b5751 | 366 | static void sctp_generate_autoclose_event(struct timer_list *t) |
1da177e4 | 367 | { |
9c3b5751 KC |
368 | struct sctp_association *asoc = |
369 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_AUTOCLOSE]); | |
370 | ||
1da177e4 LT |
371 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); |
372 | } | |
373 | ||
374 | /* Generate a heart beat event. If the sock is busy, reschedule. Make | |
375 | * sure that the transport is still valid. | |
376 | */ | |
9c3b5751 | 377 | void sctp_generate_heartbeat_event(struct timer_list *t) |
1da177e4 | 378 | { |
9c3b5751 | 379 | struct sctp_transport *transport = from_timer(transport, t, hb_timer); |
1da177e4 | 380 | struct sctp_association *asoc = transport->asoc; |
635682a1 KH |
381 | struct sock *sk = asoc->base.sk; |
382 | struct net *net = sock_net(sk); | |
ba6f5e33 | 383 | u32 elapsed, timeout; |
172a1599 | 384 | int error = 0; |
1da177e4 | 385 | |
635682a1 KH |
386 | bh_lock_sock(sk); |
387 | if (sock_owned_by_user(sk)) { | |
bb33381d | 388 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
389 | |
390 | /* Try again later. */ | |
391 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) | |
392 | sctp_transport_hold(transport); | |
393 | goto out_unlock; | |
394 | } | |
395 | ||
ba6f5e33 MRL |
396 | /* Check if we should still send the heartbeat or reschedule */ |
397 | elapsed = jiffies - transport->last_time_sent; | |
398 | timeout = sctp_transport_timeout(transport); | |
399 | if (elapsed < timeout) { | |
400 | elapsed = timeout - elapsed; | |
401 | if (!mod_timer(&transport->hb_timer, jiffies + elapsed)) | |
402 | sctp_transport_hold(transport); | |
403 | goto out_unlock; | |
404 | } | |
405 | ||
55e26eb9 | 406 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
407 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
408 | asoc->state, asoc->ep, asoc, | |
409 | transport, GFP_ATOMIC); | |
410 | ||
f05940e6 | 411 | if (error) |
635682a1 | 412 | sk->sk_err = -error; |
1da177e4 LT |
413 | |
414 | out_unlock: | |
635682a1 | 415 | bh_unlock_sock(sk); |
1da177e4 LT |
416 | sctp_transport_put(transport); |
417 | } | |
418 | ||
50b5d6ad VY |
419 | /* Handle the timeout of the ICMP protocol unreachable timer. Trigger |
420 | * the correct state machine transition that will close the association. | |
421 | */ | |
9c3b5751 | 422 | void sctp_generate_proto_unreach_event(struct timer_list *t) |
50b5d6ad | 423 | { |
9c3b5751 KC |
424 | struct sctp_transport *transport = |
425 | from_timer(transport, t, proto_unreach_timer); | |
50b5d6ad | 426 | struct sctp_association *asoc = transport->asoc; |
635682a1 KH |
427 | struct sock *sk = asoc->base.sk; |
428 | struct net *net = sock_net(sk); | |
cb3f837b | 429 | |
635682a1 KH |
430 | bh_lock_sock(sk); |
431 | if (sock_owned_by_user(sk)) { | |
bb33381d | 432 | pr_debug("%s: sock is busy\n", __func__); |
50b5d6ad VY |
433 | |
434 | /* Try again later. */ | |
435 | if (!mod_timer(&transport->proto_unreach_timer, | |
436 | jiffies + (HZ/20))) | |
437 | sctp_association_hold(asoc); | |
438 | goto out_unlock; | |
439 | } | |
440 | ||
441 | /* Is this structure just waiting around for us to actually | |
442 | * get destroyed? | |
443 | */ | |
444 | if (asoc->base.dead) | |
445 | goto out_unlock; | |
446 | ||
55e26eb9 | 447 | sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
50b5d6ad VY |
448 | SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH), |
449 | asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC); | |
450 | ||
451 | out_unlock: | |
635682a1 | 452 | bh_unlock_sock(sk); |
50b5d6ad VY |
453 | sctp_association_put(asoc); |
454 | } | |
455 | ||
7b9438de | 456 | /* Handle the timeout of the RE-CONFIG timer. */ |
9c3b5751 | 457 | void sctp_generate_reconf_event(struct timer_list *t) |
7b9438de | 458 | { |
9c3b5751 KC |
459 | struct sctp_transport *transport = |
460 | from_timer(transport, t, reconf_timer); | |
7b9438de XL |
461 | struct sctp_association *asoc = transport->asoc; |
462 | struct sock *sk = asoc->base.sk; | |
463 | struct net *net = sock_net(sk); | |
464 | int error = 0; | |
465 | ||
466 | bh_lock_sock(sk); | |
467 | if (sock_owned_by_user(sk)) { | |
468 | pr_debug("%s: sock is busy\n", __func__); | |
469 | ||
470 | /* Try again later. */ | |
471 | if (!mod_timer(&transport->reconf_timer, jiffies + (HZ / 20))) | |
472 | sctp_transport_hold(transport); | |
473 | goto out_unlock; | |
474 | } | |
475 | ||
476 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, | |
477 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_RECONF), | |
478 | asoc->state, asoc->ep, asoc, | |
479 | transport, GFP_ATOMIC); | |
480 | ||
481 | if (error) | |
482 | sk->sk_err = -error; | |
483 | ||
484 | out_unlock: | |
485 | bh_unlock_sock(sk); | |
486 | sctp_transport_put(transport); | |
487 | } | |
50b5d6ad | 488 | |
1da177e4 | 489 | /* Inject a SACK Timeout event into the state machine. */ |
9c3b5751 | 490 | static void sctp_generate_sack_event(struct timer_list *t) |
1da177e4 | 491 | { |
9c3b5751 KC |
492 | struct sctp_association *asoc = |
493 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_SACK]); | |
494 | ||
1da177e4 LT |
495 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); |
496 | } | |
497 | ||
498 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { | |
9c3b5751 KC |
499 | [SCTP_EVENT_TIMEOUT_NONE] = NULL, |
500 | [SCTP_EVENT_TIMEOUT_T1_COOKIE] = sctp_generate_t1_cookie_event, | |
501 | [SCTP_EVENT_TIMEOUT_T1_INIT] = sctp_generate_t1_init_event, | |
502 | [SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = sctp_generate_t2_shutdown_event, | |
503 | [SCTP_EVENT_TIMEOUT_T3_RTX] = NULL, | |
504 | [SCTP_EVENT_TIMEOUT_T4_RTO] = sctp_generate_t4_rto_event, | |
505 | [SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD] = | |
506 | sctp_generate_t5_shutdown_guard_event, | |
507 | [SCTP_EVENT_TIMEOUT_HEARTBEAT] = NULL, | |
508 | [SCTP_EVENT_TIMEOUT_RECONF] = NULL, | |
509 | [SCTP_EVENT_TIMEOUT_SACK] = sctp_generate_sack_event, | |
510 | [SCTP_EVENT_TIMEOUT_AUTOCLOSE] = sctp_generate_autoclose_event, | |
1da177e4 LT |
511 | }; |
512 | ||
513 | ||
514 | /* RFC 2960 8.2 Path Failure Detection | |
515 | * | |
516 | * When its peer endpoint is multi-homed, an endpoint should keep a | |
517 | * error counter for each of the destination transport addresses of the | |
518 | * peer endpoint. | |
519 | * | |
520 | * Each time the T3-rtx timer expires on any address, or when a | |
521 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, | |
522 | * the error counter of that destination address will be incremented. | |
523 | * When the value in the error counter exceeds the protocol parameter | |
524 | * 'Path.Max.Retrans' of that destination address, the endpoint should | |
525 | * mark the destination transport address as inactive, and a | |
526 | * notification SHOULD be sent to the upper layer. | |
527 | * | |
528 | */ | |
a85bbeb2 | 529 | static void sctp_do_8_2_transport_strike(struct sctp_cmd_seq *commands, |
5aa93bcf | 530 | struct sctp_association *asoc, |
7e99013a VY |
531 | struct sctp_transport *transport, |
532 | int is_hb) | |
1da177e4 | 533 | { |
566178f8 ZY |
534 | struct net *net = sock_net(asoc->base.sk); |
535 | ||
1da177e4 LT |
536 | /* The check for association's overall error counter exceeding the |
537 | * threshold is done in the state function. | |
538 | */ | |
b9f84786 VY |
539 | /* We are here due to a timer expiration. If the timer was |
540 | * not a HEARTBEAT, then normal error tracking is done. | |
541 | * If the timer was a heartbeat, we only increment error counts | |
542 | * when we already have an outstanding HEARTBEAT that has not | |
543 | * been acknowledged. | |
25985edc | 544 | * Additionally, some tranport states inhibit error increments. |
ad8fec17 | 545 | */ |
b9f84786 | 546 | if (!is_hb) { |
ad8fec17 | 547 | asoc->overall_error_count++; |
b9f84786 VY |
548 | if (transport->state != SCTP_INACTIVE) |
549 | transport->error_count++; | |
550 | } else if (transport->hb_sent) { | |
551 | if (transport->state != SCTP_UNCONFIRMED) | |
552 | asoc->overall_error_count++; | |
553 | if (transport->state != SCTP_INACTIVE) | |
554 | transport->error_count++; | |
555 | } | |
1da177e4 | 556 | |
5aa93bcf | 557 | /* If the transport error count is greater than the pf_retrans |
7cce3b75 | 558 | * threshold, and less than pathmaxrtx, and if the current state |
8c2eab90 KH |
559 | * is SCTP_ACTIVE, then mark this transport as Partially Failed, |
560 | * see SCTP Quick Failover Draft, section 5.1 | |
5aa93bcf | 561 | */ |
566178f8 ZY |
562 | if (net->sctp.pf_enable && |
563 | (transport->state == SCTP_ACTIVE) && | |
5aa93bcf NH |
564 | (asoc->pf_retrans < transport->pathmaxrxt) && |
565 | (transport->error_count > asoc->pf_retrans)) { | |
566 | ||
567 | sctp_assoc_control_transport(asoc, transport, | |
568 | SCTP_TRANSPORT_PF, | |
569 | 0); | |
570 | ||
571 | /* Update the hb timer to resend a heartbeat every rto */ | |
ba6f5e33 | 572 | sctp_transport_reset_hb_timer(transport); |
5aa93bcf NH |
573 | } |
574 | ||
3f7a87d2 | 575 | if (transport->state != SCTP_INACTIVE && |
b9f84786 | 576 | (transport->error_count > transport->pathmaxrxt)) { |
bb33381d DB |
577 | pr_debug("%s: association:%p transport addr:%pISpc failed\n", |
578 | __func__, asoc, &transport->ipaddr.sa); | |
579 | ||
1da177e4 LT |
580 | sctp_assoc_control_transport(asoc, transport, |
581 | SCTP_TRANSPORT_DOWN, | |
582 | SCTP_FAILED_THRESHOLD); | |
583 | } | |
584 | ||
585 | /* E2) For the destination address for which the timer | |
586 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
587 | * maximum value discussed in rule C7 above (RTO.max) may be | |
588 | * used to provide an upper bound to this doubling operation. | |
faee47cd VY |
589 | * |
590 | * Special Case: the first HB doesn't trigger exponential backoff. | |
3ad2f3fb | 591 | * The first unacknowledged HB triggers it. We do this with a flag |
faee47cd | 592 | * that indicates that we have an outstanding HB. |
1da177e4 | 593 | */ |
7e99013a | 594 | if (!is_hb || transport->hb_sent) { |
faee47cd | 595 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
196d6759 | 596 | sctp_max_rto(asoc, transport); |
faee47cd | 597 | } |
1da177e4 LT |
598 | } |
599 | ||
600 | /* Worker routine to handle INIT command failure. */ | |
a85bbeb2 | 601 | static void sctp_cmd_init_failed(struct sctp_cmd_seq *commands, |
1da177e4 | 602 | struct sctp_association *asoc, |
95c96174 | 603 | unsigned int error) |
1da177e4 LT |
604 | { |
605 | struct sctp_ulpevent *event; | |
606 | ||
cb3f837b | 607 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_CANT_STR_ASSOC, |
a5a35e76 | 608 | (__u16)error, 0, 0, NULL, |
1da177e4 LT |
609 | GFP_ATOMIC); |
610 | ||
611 | if (event) | |
612 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
613 | SCTP_ULPEVENT(event)); | |
614 | ||
615 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
616 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
617 | ||
618 | /* SEND_FAILED sent later when cleaning up the association. */ | |
619 | asoc->outqueue.error = error; | |
620 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
621 | } | |
622 | ||
623 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ | |
a85bbeb2 | 624 | static void sctp_cmd_assoc_failed(struct sctp_cmd_seq *commands, |
1da177e4 | 625 | struct sctp_association *asoc, |
88ee48c1 | 626 | enum sctp_event_type event_type, |
bfc6f827 | 627 | union sctp_subtype subtype, |
1da177e4 | 628 | struct sctp_chunk *chunk, |
95c96174 | 629 | unsigned int error) |
1da177e4 LT |
630 | { |
631 | struct sctp_ulpevent *event; | |
de4594a5 | 632 | struct sctp_chunk *abort; |
172a1599 | 633 | |
1da177e4 | 634 | /* Cancel any partial delivery in progress. */ |
65f5e357 | 635 | asoc->stream.si->abort_pd(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 | 636 | |
a5a35e76 VY |
637 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
638 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
639 | (__u16)error, 0, 0, chunk, | |
640 | GFP_ATOMIC); | |
641 | else | |
642 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
643 | (__u16)error, 0, 0, NULL, | |
1da177e4 LT |
644 | GFP_ATOMIC); |
645 | if (event) | |
646 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
647 | SCTP_ULPEVENT(event)); | |
648 | ||
de4594a5 NH |
649 | if (asoc->overall_error_count >= asoc->max_retrans) { |
650 | abort = sctp_make_violation_max_retrans(asoc, chunk); | |
651 | if (abort) | |
652 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
653 | SCTP_CHUNK(abort)); | |
654 | } | |
655 | ||
1da177e4 LT |
656 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
657 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
658 | ||
1da177e4 LT |
659 | /* SEND_FAILED sent later when cleaning up the association. */ |
660 | asoc->outqueue.error = error; | |
661 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
662 | } | |
663 | ||
664 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT | |
665 | * inside the cookie. In reality, this is only used for INIT-ACK processing | |
666 | * since all other cases use "temporary" associations and can do all | |
667 | * their work in statefuns directly. | |
668 | */ | |
a85bbeb2 | 669 | static int sctp_cmd_process_init(struct sctp_cmd_seq *commands, |
1da177e4 LT |
670 | struct sctp_association *asoc, |
671 | struct sctp_chunk *chunk, | |
01a992be | 672 | struct sctp_init_chunk *peer_init, |
dd0fc66f | 673 | gfp_t gfp) |
1da177e4 LT |
674 | { |
675 | int error; | |
676 | ||
677 | /* We only process the init as a sideeffect in a single | |
678 | * case. This is when we process the INIT-ACK. If we | |
679 | * fail during INIT processing (due to malloc problems), | |
680 | * just return the error and stop processing the stack. | |
681 | */ | |
de6becdc | 682 | if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp)) |
1da177e4 LT |
683 | error = -ENOMEM; |
684 | else | |
685 | error = 0; | |
686 | ||
687 | return error; | |
688 | } | |
689 | ||
690 | /* Helper function to break out starting up of heartbeat timers. */ | |
a85bbeb2 | 691 | static void sctp_cmd_hb_timers_start(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
692 | struct sctp_association *asoc) |
693 | { | |
694 | struct sctp_transport *t; | |
1da177e4 LT |
695 | |
696 | /* Start a heartbeat timer for each transport on the association. | |
697 | * hold a reference on the transport to make sure none of | |
698 | * the needed data structures go away. | |
699 | */ | |
ba6f5e33 MRL |
700 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) |
701 | sctp_transport_reset_hb_timer(t); | |
1da177e4 LT |
702 | } |
703 | ||
a85bbeb2 | 704 | static void sctp_cmd_hb_timers_stop(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
705 | struct sctp_association *asoc) |
706 | { | |
707 | struct sctp_transport *t; | |
1da177e4 LT |
708 | |
709 | /* Stop all heartbeat timers. */ | |
710 | ||
9dbc15f0 RD |
711 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
712 | transports) { | |
1da177e4 LT |
713 | if (del_timer(&t->hb_timer)) |
714 | sctp_transport_put(t); | |
715 | } | |
716 | } | |
717 | ||
718 | /* Helper function to stop any pending T3-RTX timers */ | |
a85bbeb2 | 719 | static void sctp_cmd_t3_rtx_timers_stop(struct sctp_cmd_seq *cmds, |
d808ad9a | 720 | struct sctp_association *asoc) |
1da177e4 LT |
721 | { |
722 | struct sctp_transport *t; | |
1da177e4 | 723 | |
9dbc15f0 RD |
724 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
725 | transports) { | |
25cc4ae9 | 726 | if (del_timer(&t->T3_rtx_timer)) |
1da177e4 | 727 | sctp_transport_put(t); |
1da177e4 LT |
728 | } |
729 | } | |
730 | ||
731 | ||
1da177e4 | 732 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ |
a85bbeb2 | 733 | static void sctp_cmd_transport_on(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
734 | struct sctp_association *asoc, |
735 | struct sctp_transport *t, | |
736 | struct sctp_chunk *chunk) | |
737 | { | |
edf903f8 | 738 | struct sctp_sender_hb_info *hbinfo; |
34d2d89f | 739 | int was_unconfirmed = 0; |
1da177e4 LT |
740 | |
741 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the | |
742 | * HEARTBEAT should clear the error counter of the destination | |
743 | * transport address to which the HEARTBEAT was sent. | |
1da177e4 LT |
744 | */ |
745 | t->error_count = 0; | |
f8d96052 TG |
746 | |
747 | /* | |
748 | * Although RFC4960 specifies that the overall error count must | |
749 | * be cleared when a HEARTBEAT ACK is received, we make an | |
750 | * exception while in SHUTDOWN PENDING. If the peer keeps its | |
751 | * window shut forever, we may never be able to transmit our | |
752 | * outstanding data and rely on the retransmission limit be reached | |
753 | * to shutdown the association. | |
754 | */ | |
f648f807 | 755 | if (t->asoc->state < SCTP_STATE_SHUTDOWN_PENDING) |
f8d96052 | 756 | t->asoc->overall_error_count = 0; |
1da177e4 | 757 | |
faee47cd VY |
758 | /* Clear the hb_sent flag to signal that we had a good |
759 | * acknowledgement. | |
760 | */ | |
761 | t->hb_sent = 0; | |
762 | ||
1da177e4 LT |
763 | /* Mark the destination transport address as active if it is not so |
764 | * marked. | |
765 | */ | |
34d2d89f MH |
766 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) { |
767 | was_unconfirmed = 1; | |
1da177e4 LT |
768 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
769 | SCTP_HEARTBEAT_SUCCESS); | |
34d2d89f | 770 | } |
1da177e4 | 771 | |
5aa93bcf NH |
772 | if (t->state == SCTP_PF) |
773 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, | |
774 | SCTP_HEARTBEAT_SUCCESS); | |
775 | ||
8c2f414a DB |
776 | /* HB-ACK was received for a the proper HB. Consider this |
777 | * forward progress. | |
778 | */ | |
779 | if (t->dst) | |
c86a773c | 780 | sctp_transport_dst_confirm(t); |
8c2f414a | 781 | |
1da177e4 LT |
782 | /* The receiver of the HEARTBEAT ACK should also perform an |
783 | * RTT measurement for that destination transport address | |
784 | * using the time value carried in the HEARTBEAT ACK chunk. | |
e533ca16 VY |
785 | * If the transport's rto_pending variable has been cleared, |
786 | * it was most likely due to a retransmit. However, we want | |
787 | * to re-enable it to properly update the rto. | |
1da177e4 | 788 | */ |
e533ca16 VY |
789 | if (t->rto_pending == 0) |
790 | t->rto_pending = 1; | |
791 | ||
edf903f8 | 792 | hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data; |
1da177e4 | 793 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); |
ad8fec17 SS |
794 | |
795 | /* Update the heartbeat timer. */ | |
ba6f5e33 | 796 | sctp_transport_reset_hb_timer(t); |
34d2d89f MH |
797 | |
798 | if (was_unconfirmed && asoc->peer.transport_count == 1) | |
799 | sctp_transport_immediate_rtx(t); | |
1da177e4 LT |
800 | } |
801 | ||
1da177e4 LT |
802 | |
803 | /* Helper function to process the process SACK command. */ | |
a85bbeb2 | 804 | static int sctp_cmd_process_sack(struct sctp_cmd_seq *cmds, |
1da177e4 | 805 | struct sctp_association *asoc, |
edfee033 | 806 | struct sctp_chunk *chunk) |
1da177e4 | 807 | { |
2e3216cd | 808 | int err = 0; |
1da177e4 | 809 | |
edfee033 | 810 | if (sctp_outq_sack(&asoc->outqueue, chunk)) { |
55e26eb9 EB |
811 | struct net *net = sock_net(asoc->base.sk); |
812 | ||
1da177e4 | 813 | /* There are no more TSNs awaiting SACK. */ |
55e26eb9 | 814 | err = sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
1da177e4 LT |
815 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
816 | asoc->state, asoc->ep, asoc, NULL, | |
817 | GFP_ATOMIC); | |
1da177e4 LT |
818 | } |
819 | ||
820 | return err; | |
821 | } | |
822 | ||
823 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set | |
824 | * the transport for a shutdown chunk. | |
825 | */ | |
a85bbeb2 | 826 | static void sctp_cmd_setup_t2(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
827 | struct sctp_association *asoc, |
828 | struct sctp_chunk *chunk) | |
829 | { | |
830 | struct sctp_transport *t; | |
831 | ||
c17b02b3 VY |
832 | if (chunk->transport) |
833 | t = chunk->transport; | |
834 | else { | |
835 | t = sctp_assoc_choose_alter_transport(asoc, | |
9919b455 | 836 | asoc->shutdown_last_sent_to); |
c17b02b3 VY |
837 | chunk->transport = t; |
838 | } | |
1da177e4 LT |
839 | asoc->shutdown_last_sent_to = t; |
840 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; | |
1da177e4 LT |
841 | } |
842 | ||
a85bbeb2 | 843 | static void sctp_cmd_assoc_update(struct sctp_cmd_seq *cmds, |
5ee8aa68 XL |
844 | struct sctp_association *asoc, |
845 | struct sctp_association *new) | |
846 | { | |
847 | struct net *net = sock_net(asoc->base.sk); | |
848 | struct sctp_chunk *abort; | |
849 | ||
850 | if (!sctp_assoc_update(asoc, new)) | |
851 | return; | |
852 | ||
d8238d9d | 853 | abort = sctp_make_abort(asoc, NULL, sizeof(struct sctp_errhdr)); |
5ee8aa68 XL |
854 | if (abort) { |
855 | sctp_init_cause(abort, SCTP_ERROR_RSRC_LOW, 0); | |
856 | sctp_add_cmd_sf(cmds, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); | |
857 | } | |
858 | sctp_add_cmd_sf(cmds, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNABORTED)); | |
859 | sctp_add_cmd_sf(cmds, SCTP_CMD_ASSOC_FAILED, | |
860 | SCTP_PERR(SCTP_ERROR_RSRC_LOW)); | |
861 | SCTP_INC_STATS(net, SCTP_MIB_ABORTEDS); | |
862 | SCTP_DEC_STATS(net, SCTP_MIB_CURRESTAB); | |
863 | } | |
864 | ||
1da177e4 | 865 | /* Helper function to change the state of an association. */ |
a85bbeb2 | 866 | static void sctp_cmd_new_state(struct sctp_cmd_seq *cmds, |
1da177e4 | 867 | struct sctp_association *asoc, |
52106019 | 868 | enum sctp_state state) |
1da177e4 LT |
869 | { |
870 | struct sock *sk = asoc->base.sk; | |
871 | ||
872 | asoc->state = state; | |
873 | ||
bb33381d | 874 | pr_debug("%s: asoc:%p[%s]\n", __func__, asoc, sctp_state_tbl[state]); |
3f7a87d2 | 875 | |
1da177e4 | 876 | if (sctp_style(sk, TCP)) { |
3f7a87d2 | 877 | /* Change the sk->sk_state of a TCP-style socket that has |
af901ca1 | 878 | * successfully completed a connect() call. |
1da177e4 LT |
879 | */ |
880 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) | |
cbabf463 | 881 | inet_sk_set_state(sk, SCTP_SS_ESTABLISHED); |
1da177e4 LT |
882 | |
883 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ | |
884 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && | |
d46e416c | 885 | sctp_sstate(sk, ESTABLISHED)) { |
cbabf463 | 886 | inet_sk_set_state(sk, SCTP_SS_CLOSING); |
1da177e4 | 887 | sk->sk_shutdown |= RCV_SHUTDOWN; |
d46e416c | 888 | } |
1da177e4 LT |
889 | } |
890 | ||
3f7a87d2 FF |
891 | if (sctp_state(asoc, COOKIE_WAIT)) { |
892 | /* Reset init timeouts since they may have been | |
893 | * increased due to timer expirations. | |
894 | */ | |
895 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = | |
1e7d3d90 | 896 | asoc->rto_initial; |
3f7a87d2 | 897 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
1e7d3d90 | 898 | asoc->rto_initial; |
3f7a87d2 FF |
899 | } |
900 | ||
1da177e4 LT |
901 | if (sctp_state(asoc, ESTABLISHED) || |
902 | sctp_state(asoc, CLOSED) || | |
903 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { | |
904 | /* Wake up any processes waiting in the asoc's wait queue in | |
905 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). | |
d808ad9a | 906 | */ |
1da177e4 LT |
907 | if (waitqueue_active(&asoc->wait)) |
908 | wake_up_interruptible(&asoc->wait); | |
909 | ||
910 | /* Wake up any processes waiting in the sk's sleep queue of | |
911 | * a TCP-style or UDP-style peeled-off socket in | |
912 | * sctp_wait_for_accept() or sctp_wait_for_packet(). | |
913 | * For a UDP-style socket, the waiters are woken up by the | |
914 | * notifications. | |
915 | */ | |
916 | if (!sctp_style(sk, UDP)) | |
917 | sk->sk_state_change(sk); | |
918 | } | |
b7018d0b XL |
919 | |
920 | if (sctp_state(asoc, SHUTDOWN_PENDING) && | |
921 | !sctp_outq_is_empty(&asoc->outqueue)) | |
922 | sctp_outq_uncork(&asoc->outqueue, GFP_ATOMIC); | |
1da177e4 LT |
923 | } |
924 | ||
925 | /* Helper function to delete an association. */ | |
a85bbeb2 | 926 | static void sctp_cmd_delete_tcb(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
927 | struct sctp_association *asoc) |
928 | { | |
929 | struct sock *sk = asoc->base.sk; | |
930 | ||
931 | /* If it is a non-temporary association belonging to a TCP-style | |
d808ad9a | 932 | * listening socket that is not closed, do not free it so that accept() |
1da177e4 | 933 | * can pick it up later. |
d808ad9a | 934 | */ |
1da177e4 LT |
935 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
936 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) | |
937 | return; | |
938 | ||
1da177e4 LT |
939 | sctp_association_free(asoc); |
940 | } | |
941 | ||
942 | /* | |
943 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
944 | * A4) Start a T-4 RTO timer, using the RTO value of the selected | |
945 | * destination address (we use active path instead of primary path just | |
d808ad9a | 946 | * because primary path may be inactive. |
1da177e4 | 947 | */ |
a85bbeb2 XL |
948 | static void sctp_cmd_setup_t4(struct sctp_cmd_seq *cmds, |
949 | struct sctp_association *asoc, | |
950 | struct sctp_chunk *chunk) | |
1da177e4 LT |
951 | { |
952 | struct sctp_transport *t; | |
953 | ||
9919b455 | 954 | t = sctp_assoc_choose_alter_transport(asoc, chunk->transport); |
1da177e4 LT |
955 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
956 | chunk->transport = t; | |
957 | } | |
958 | ||
d808ad9a | 959 | /* Process an incoming Operation Error Chunk. */ |
a85bbeb2 | 960 | static void sctp_cmd_process_operr(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
961 | struct sctp_association *asoc, |
962 | struct sctp_chunk *chunk) | |
963 | { | |
1da177e4 | 964 | struct sctp_errhdr *err_hdr; |
3df26787 WY |
965 | struct sctp_ulpevent *ev; |
966 | ||
967 | while (chunk->chunk_end > chunk->skb->data) { | |
968 | err_hdr = (struct sctp_errhdr *)(chunk->skb->data); | |
969 | ||
970 | ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, | |
971 | GFP_ATOMIC); | |
972 | if (!ev) | |
973 | return; | |
974 | ||
9162e0ed | 975 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); |
3df26787 WY |
976 | |
977 | switch (err_hdr->cause) { | |
978 | case SCTP_ERROR_UNKNOWN_CHUNK: | |
979 | { | |
922dbc5b | 980 | struct sctp_chunkhdr *unk_chunk_hdr; |
3df26787 | 981 | |
922dbc5b XL |
982 | unk_chunk_hdr = (struct sctp_chunkhdr *) |
983 | err_hdr->variable; | |
3df26787 WY |
984 | switch (unk_chunk_hdr->type) { |
985 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with | |
986 | * an ERROR chunk reporting that it did not recognized | |
987 | * the ASCONF chunk type, the sender of the ASCONF MUST | |
988 | * NOT send any further ASCONF chunks and MUST stop its | |
989 | * T-4 timer. | |
990 | */ | |
991 | case SCTP_CID_ASCONF: | |
992 | if (asoc->peer.asconf_capable == 0) | |
993 | break; | |
994 | ||
995 | asoc->peer.asconf_capable = 0; | |
996 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, | |
1da177e4 | 997 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
3df26787 WY |
998 | break; |
999 | default: | |
1000 | break; | |
1001 | } | |
1da177e4 | 1002 | break; |
3df26787 | 1003 | } |
1da177e4 LT |
1004 | default: |
1005 | break; | |
1006 | } | |
1da177e4 LT |
1007 | } |
1008 | } | |
1009 | ||
d808ad9a | 1010 | /* Helper function to remove the association non-primary peer |
1da177e4 | 1011 | * transports. |
d808ad9a | 1012 | */ |
1da177e4 LT |
1013 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
1014 | { | |
1015 | struct sctp_transport *t; | |
1da177e4 | 1016 | struct list_head *temp; |
172a1599 | 1017 | struct list_head *pos; |
1da177e4 LT |
1018 | |
1019 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
1020 | t = list_entry(pos, struct sctp_transport, transports); | |
5f242a13 | 1021 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
d808ad9a | 1022 | &asoc->peer.primary_addr)) { |
73e67420 | 1023 | sctp_assoc_rm_peer(asoc, t); |
1da177e4 LT |
1024 | } |
1025 | } | |
1da177e4 LT |
1026 | } |
1027 | ||
8de8c873 SS |
1028 | /* Helper function to set sk_err on a 1-1 style socket. */ |
1029 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) | |
1030 | { | |
1031 | struct sock *sk = asoc->base.sk; | |
1032 | ||
1033 | if (!sctp_style(sk, UDP)) | |
1034 | sk->sk_err = error; | |
1035 | } | |
1036 | ||
07d93967 | 1037 | /* Helper function to generate an association change event */ |
a85bbeb2 XL |
1038 | static void sctp_cmd_assoc_change(struct sctp_cmd_seq *commands, |
1039 | struct sctp_association *asoc, | |
1040 | u8 state) | |
07d93967 VY |
1041 | { |
1042 | struct sctp_ulpevent *ev; | |
1043 | ||
1044 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, | |
1045 | asoc->c.sinit_num_ostreams, | |
1046 | asoc->c.sinit_max_instreams, | |
1047 | NULL, GFP_ATOMIC); | |
1048 | if (ev) | |
9162e0ed | 1049 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); |
07d93967 VY |
1050 | } |
1051 | ||
30f6ebf6 XL |
1052 | static void sctp_cmd_peer_no_auth(struct sctp_cmd_seq *commands, |
1053 | struct sctp_association *asoc) | |
1054 | { | |
1055 | struct sctp_ulpevent *ev; | |
1056 | ||
1057 | ev = sctp_ulpevent_make_authkey(asoc, 0, SCTP_AUTH_NO_AUTH, GFP_ATOMIC); | |
1058 | if (ev) | |
1059 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); | |
1060 | } | |
1061 | ||
07d93967 | 1062 | /* Helper function to generate an adaptation indication event */ |
a85bbeb2 | 1063 | static void sctp_cmd_adaptation_ind(struct sctp_cmd_seq *commands, |
07d93967 VY |
1064 | struct sctp_association *asoc) |
1065 | { | |
1066 | struct sctp_ulpevent *ev; | |
1067 | ||
1068 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1069 | ||
1070 | if (ev) | |
9162e0ed | 1071 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); |
07d93967 VY |
1072 | } |
1073 | ||
96cd0d3d VY |
1074 | |
1075 | static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, | |
19cd1592 XL |
1076 | enum sctp_event_timeout timer, |
1077 | char *name) | |
96cd0d3d VY |
1078 | { |
1079 | struct sctp_transport *t; | |
1080 | ||
1081 | t = asoc->init_last_sent_to; | |
1082 | asoc->init_err_counter++; | |
1083 | ||
1084 | if (t->init_sent_count > (asoc->init_cycle + 1)) { | |
1085 | asoc->timeouts[timer] *= 2; | |
1086 | if (asoc->timeouts[timer] > asoc->max_init_timeo) { | |
1087 | asoc->timeouts[timer] = asoc->max_init_timeo; | |
1088 | } | |
1089 | asoc->init_cycle++; | |
bb33381d DB |
1090 | |
1091 | pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d" | |
1092 | " cycle:%d timeout:%ld\n", __func__, name, | |
1093 | asoc->init_err_counter, asoc->init_cycle, | |
1094 | asoc->timeouts[timer]); | |
96cd0d3d VY |
1095 | } |
1096 | ||
1097 | } | |
1098 | ||
9c5c62be VY |
1099 | /* Send the whole message, chunk by chunk, to the outqueue. |
1100 | * This way the whole message is queued up and bundling if | |
1101 | * encouraged for small fragments. | |
1102 | */ | |
66388f2c XL |
1103 | static void sctp_cmd_send_msg(struct sctp_association *asoc, |
1104 | struct sctp_datamsg *msg, gfp_t gfp) | |
9c5c62be VY |
1105 | { |
1106 | struct sctp_chunk *chunk; | |
9c5c62be | 1107 | |
66388f2c XL |
1108 | list_for_each_entry(chunk, &msg->chunks, frag_list) |
1109 | sctp_outq_tail(&asoc->outqueue, chunk, gfp); | |
5bbbbe32 MRL |
1110 | |
1111 | asoc->outqueue.sched->enqueue(&asoc->outqueue, msg); | |
9c5c62be VY |
1112 | } |
1113 | ||
1114 | ||
1da177e4 LT |
1115 | /* These three macros allow us to pull the debugging code out of the |
1116 | * main flow of sctp_do_sm() to keep attention focused on the real | |
1117 | * functionality there. | |
1118 | */ | |
bb33381d DB |
1119 | #define debug_pre_sfn() \ |
1120 | pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \ | |
1121 | ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \ | |
1122 | asoc, sctp_state_tbl[state], state_fn->name) | |
1123 | ||
1124 | #define debug_post_sfn() \ | |
1125 | pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \ | |
1126 | sctp_status_tbl[status]) | |
1127 | ||
1128 | #define debug_post_sfx() \ | |
1129 | pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \ | |
1130 | asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ | |
1131 | sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED]) | |
1da177e4 LT |
1132 | |
1133 | /* | |
1134 | * This is the master state machine processing function. | |
1135 | * | |
1136 | * If you want to understand all of lksctp, this is a | |
1137 | * good place to start. | |
1138 | */ | |
88ee48c1 | 1139 | int sctp_do_sm(struct net *net, enum sctp_event_type event_type, |
bfc6f827 | 1140 | union sctp_subtype subtype, enum sctp_state state, |
61f0eb07 XL |
1141 | struct sctp_endpoint *ep, struct sctp_association *asoc, |
1142 | void *event_arg, gfp_t gfp) | |
1da177e4 | 1143 | { |
bfc6f827 | 1144 | typedef const char *(printfn_t)(union sctp_subtype); |
1da177e4 LT |
1145 | static printfn_t *table[] = { |
1146 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, | |
1147 | }; | |
1148 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; | |
172a1599 XL |
1149 | const struct sctp_sm_table_entry *state_fn; |
1150 | struct sctp_cmd_seq commands; | |
1151 | enum sctp_disposition status; | |
1152 | int error = 0; | |
1da177e4 LT |
1153 | |
1154 | /* Look up the state function, run it, and then process the | |
1155 | * side effects. These three steps are the heart of lksctp. | |
1156 | */ | |
55e26eb9 | 1157 | state_fn = sctp_sm_lookup_event(net, event_type, state, subtype); |
1da177e4 LT |
1158 | |
1159 | sctp_init_cmd_seq(&commands); | |
1160 | ||
bb33381d | 1161 | debug_pre_sfn(); |
131334d0 | 1162 | status = state_fn->fn(net, ep, asoc, subtype, event_arg, &commands); |
bb33381d | 1163 | debug_post_sfn(); |
1da177e4 LT |
1164 | |
1165 | error = sctp_side_effects(event_type, subtype, state, | |
649621e3 | 1166 | ep, &asoc, event_arg, status, |
1da177e4 | 1167 | &commands, gfp); |
bb33381d | 1168 | debug_post_sfx(); |
1da177e4 LT |
1169 | |
1170 | return error; | |
1171 | } | |
1172 | ||
1da177e4 LT |
1173 | /***************************************************************** |
1174 | * This the master state function side effect processing function. | |
1175 | *****************************************************************/ | |
88ee48c1 | 1176 | static int sctp_side_effects(enum sctp_event_type event_type, |
bfc6f827 | 1177 | union sctp_subtype subtype, |
52106019 | 1178 | enum sctp_state state, |
1da177e4 | 1179 | struct sctp_endpoint *ep, |
649621e3 | 1180 | struct sctp_association **asoc, |
1da177e4 | 1181 | void *event_arg, |
172a1599 | 1182 | enum sctp_disposition status, |
a85bbeb2 | 1183 | struct sctp_cmd_seq *commands, |
dd0fc66f | 1184 | gfp_t gfp) |
1da177e4 LT |
1185 | { |
1186 | int error; | |
1187 | ||
1188 | /* FIXME - Most of the dispositions left today would be categorized | |
1189 | * as "exceptional" dispositions. For those dispositions, it | |
1190 | * may not be proper to run through any of the commands at all. | |
1191 | * For example, the command interpreter might be run only with | |
1192 | * disposition SCTP_DISPOSITION_CONSUME. | |
1193 | */ | |
1194 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, | |
649621e3 | 1195 | ep, *asoc, |
1da177e4 LT |
1196 | event_arg, status, |
1197 | commands, gfp))) | |
1198 | goto bail; | |
1199 | ||
1200 | switch (status) { | |
1201 | case SCTP_DISPOSITION_DISCARD: | |
bb33381d DB |
1202 | pr_debug("%s: ignored sctp protocol event - state:%d, " |
1203 | "event_type:%d, event_id:%d\n", __func__, state, | |
1204 | event_type, subtype.chunk); | |
1da177e4 LT |
1205 | break; |
1206 | ||
1207 | case SCTP_DISPOSITION_NOMEM: | |
1208 | /* We ran out of memory, so we need to discard this | |
1209 | * packet. | |
1210 | */ | |
1211 | /* BUG--we should now recover some memory, probably by | |
1212 | * reneging... | |
1213 | */ | |
1214 | error = -ENOMEM; | |
1215 | break; | |
1216 | ||
d808ad9a | 1217 | case SCTP_DISPOSITION_DELETE_TCB: |
649621e3 | 1218 | case SCTP_DISPOSITION_ABORT: |
1da177e4 | 1219 | /* This should now be a command. */ |
649621e3 | 1220 | *asoc = NULL; |
1da177e4 LT |
1221 | break; |
1222 | ||
1223 | case SCTP_DISPOSITION_CONSUME: | |
1da177e4 LT |
1224 | /* |
1225 | * We should no longer have much work to do here as the | |
1226 | * real work has been done as explicit commands above. | |
1227 | */ | |
1228 | break; | |
1229 | ||
1230 | case SCTP_DISPOSITION_VIOLATION: | |
e87cc472 JP |
1231 | net_err_ratelimited("protocol violation state %d chunkid %d\n", |
1232 | state, subtype.chunk); | |
1da177e4 LT |
1233 | break; |
1234 | ||
1235 | case SCTP_DISPOSITION_NOT_IMPL: | |
145ce502 JP |
1236 | pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n", |
1237 | state, event_type, subtype.chunk); | |
1da177e4 LT |
1238 | break; |
1239 | ||
1240 | case SCTP_DISPOSITION_BUG: | |
145ce502 | 1241 | pr_err("bug in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1242 | state, event_type, subtype.chunk); |
1243 | BUG(); | |
1244 | break; | |
1245 | ||
1246 | default: | |
145ce502 | 1247 | pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1248 | status, state, event_type, subtype.chunk); |
1249 | BUG(); | |
1250 | break; | |
3ff50b79 | 1251 | } |
1da177e4 LT |
1252 | |
1253 | bail: | |
1254 | return error; | |
1255 | } | |
1256 | ||
1257 | /******************************************************************** | |
1258 | * 2nd Level Abstractions | |
1259 | ********************************************************************/ | |
1260 | ||
1261 | /* This is the side-effect interpreter. */ | |
88ee48c1 | 1262 | static int sctp_cmd_interpreter(enum sctp_event_type event_type, |
bfc6f827 | 1263 | union sctp_subtype subtype, |
52106019 | 1264 | enum sctp_state state, |
1da177e4 LT |
1265 | struct sctp_endpoint *ep, |
1266 | struct sctp_association *asoc, | |
1267 | void *event_arg, | |
172a1599 | 1268 | enum sctp_disposition status, |
a85bbeb2 | 1269 | struct sctp_cmd_seq *commands, |
dd0fc66f | 1270 | gfp_t gfp) |
1da177e4 | 1271 | { |
172a1599 XL |
1272 | struct sctp_sock *sp = sctp_sk(ep->base.sk); |
1273 | struct sctp_chunk *chunk = NULL, *new_obj; | |
1da177e4 | 1274 | struct sctp_packet *packet; |
172a1599 | 1275 | struct sctp_sackhdr sackh; |
1da177e4 | 1276 | struct timer_list *timer; |
1da177e4 | 1277 | struct sctp_transport *t; |
172a1599 XL |
1278 | unsigned long timeout; |
1279 | struct sctp_cmd *cmd; | |
1da177e4 | 1280 | int local_cork = 0; |
172a1599 XL |
1281 | int error = 0; |
1282 | int force; | |
1da177e4 LT |
1283 | |
1284 | if (SCTP_EVENT_T_TIMEOUT != event_type) | |
ea110733 | 1285 | chunk = event_arg; |
1da177e4 LT |
1286 | |
1287 | /* Note: This whole file is a huge candidate for rework. | |
1288 | * For example, each command could either have its own handler, so | |
1289 | * the loop would look like: | |
1290 | * while (cmds) | |
1291 | * cmd->handle(x, y, z) | |
1292 | * --jgrimm | |
1293 | */ | |
1294 | while (NULL != (cmd = sctp_next_cmd(commands))) { | |
1295 | switch (cmd->verb) { | |
1296 | case SCTP_CMD_NOP: | |
1297 | /* Do nothing. */ | |
1298 | break; | |
1299 | ||
1300 | case SCTP_CMD_NEW_ASOC: | |
1301 | /* Register a new association. */ | |
1302 | if (local_cork) { | |
cea8768f | 1303 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1304 | local_cork = 0; |
1305 | } | |
f9e42b85 | 1306 | |
1da177e4 | 1307 | /* Register with the endpoint. */ |
f9e42b85 DB |
1308 | asoc = cmd->obj.asoc; |
1309 | BUG_ON(asoc->peer.primary_path == NULL); | |
1da177e4 | 1310 | sctp_endpoint_add_asoc(ep, asoc); |
1da177e4 LT |
1311 | break; |
1312 | ||
1313 | case SCTP_CMD_UPDATE_ASSOC: | |
5ee8aa68 | 1314 | sctp_cmd_assoc_update(commands, asoc, cmd->obj.asoc); |
1da177e4 LT |
1315 | break; |
1316 | ||
1317 | case SCTP_CMD_PURGE_OUTQUEUE: | |
1318 | sctp_outq_teardown(&asoc->outqueue); | |
1319 | break; | |
1320 | ||
d808ad9a | 1321 | case SCTP_CMD_DELETE_TCB: |
1da177e4 | 1322 | if (local_cork) { |
cea8768f | 1323 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1324 | local_cork = 0; |
1325 | } | |
1326 | /* Delete the current association. */ | |
1327 | sctp_cmd_delete_tcb(commands, asoc); | |
1328 | asoc = NULL; | |
1329 | break; | |
1330 | ||
1331 | case SCTP_CMD_NEW_STATE: | |
1332 | /* Enter a new state. */ | |
1333 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); | |
1334 | break; | |
1335 | ||
1336 | case SCTP_CMD_REPORT_TSN: | |
1337 | /* Record the arrival of a TSN. */ | |
8e1ee18c | 1338 | error = sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d | 1339 | cmd->obj.u32, NULL); |
1da177e4 LT |
1340 | break; |
1341 | ||
1342 | case SCTP_CMD_REPORT_FWDTSN: | |
47b20a88 | 1343 | asoc->stream.si->report_ftsn(&asoc->ulpq, cmd->obj.u32); |
1da177e4 LT |
1344 | break; |
1345 | ||
1346 | case SCTP_CMD_PROCESS_FWDTSN: | |
de60fe91 XL |
1347 | asoc->stream.si->handle_ftsn(&asoc->ulpq, |
1348 | cmd->obj.chunk); | |
d808ad9a | 1349 | break; |
1da177e4 LT |
1350 | |
1351 | case SCTP_CMD_GEN_SACK: | |
1352 | /* Generate a Selective ACK. | |
1353 | * The argument tells us whether to just count | |
1354 | * the packet and MAYBE generate a SACK, or | |
1355 | * force a SACK out. | |
1356 | */ | |
1357 | force = cmd->obj.i32; | |
1358 | error = sctp_gen_sack(asoc, force, commands); | |
1359 | break; | |
1360 | ||
1361 | case SCTP_CMD_PROCESS_SACK: | |
1362 | /* Process an inbound SACK. */ | |
1363 | error = sctp_cmd_process_sack(commands, asoc, | |
b26ddd81 | 1364 | cmd->obj.chunk); |
1da177e4 LT |
1365 | break; |
1366 | ||
1367 | case SCTP_CMD_GEN_INIT_ACK: | |
1368 | /* Generate an INIT ACK chunk. */ | |
1369 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, | |
1370 | 0); | |
1371 | if (!new_obj) | |
1372 | goto nomem; | |
1373 | ||
1374 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1375 | SCTP_CHUNK(new_obj)); | |
1376 | break; | |
1377 | ||
1378 | case SCTP_CMD_PEER_INIT: | |
1379 | /* Process a unified INIT from the peer. | |
1380 | * Note: Only used during INIT-ACK processing. If | |
1381 | * there is an error just return to the outter | |
1382 | * layer which will bail. | |
1383 | */ | |
1384 | error = sctp_cmd_process_init(commands, asoc, chunk, | |
b26ddd81 | 1385 | cmd->obj.init, gfp); |
1da177e4 LT |
1386 | break; |
1387 | ||
1388 | case SCTP_CMD_GEN_COOKIE_ECHO: | |
1389 | /* Generate a COOKIE ECHO chunk. */ | |
1390 | new_obj = sctp_make_cookie_echo(asoc, chunk); | |
1391 | if (!new_obj) { | |
b26ddd81 NH |
1392 | if (cmd->obj.chunk) |
1393 | sctp_chunk_free(cmd->obj.chunk); | |
1da177e4 LT |
1394 | goto nomem; |
1395 | } | |
1396 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1397 | SCTP_CHUNK(new_obj)); | |
1398 | ||
1399 | /* If there is an ERROR chunk to be sent along with | |
1400 | * the COOKIE_ECHO, send it, too. | |
1401 | */ | |
b26ddd81 | 1402 | if (cmd->obj.chunk) |
1da177e4 | 1403 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
b26ddd81 | 1404 | SCTP_CHUNK(cmd->obj.chunk)); |
1da177e4 | 1405 | |
96cd0d3d VY |
1406 | if (new_obj->transport) { |
1407 | new_obj->transport->init_sent_count++; | |
1408 | asoc->init_last_sent_to = new_obj->transport; | |
1409 | } | |
1410 | ||
1da177e4 | 1411 | /* FIXME - Eventually come up with a cleaner way to |
d808ad9a YH |
1412 | * enabling COOKIE-ECHO + DATA bundling during |
1413 | * multihoming stale cookie scenarios, the following | |
1414 | * command plays with asoc->peer.retran_path to | |
1415 | * avoid the problem of sending the COOKIE-ECHO and | |
1416 | * DATA in different paths, which could result | |
1417 | * in the association being ABORTed if the DATA chunk | |
1da177e4 LT |
1418 | * is processed first by the server. Checking the |
1419 | * init error counter simply causes this command | |
1420 | * to be executed only during failed attempts of | |
1421 | * association establishment. | |
1422 | */ | |
3f7a87d2 FF |
1423 | if ((asoc->peer.retran_path != |
1424 | asoc->peer.primary_path) && | |
1425 | (asoc->init_err_counter > 0)) { | |
1426 | sctp_add_cmd_sf(commands, | |
d808ad9a | 1427 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1da177e4 LT |
1428 | SCTP_NULL()); |
1429 | } | |
1430 | ||
1431 | break; | |
1432 | ||
1433 | case SCTP_CMD_GEN_SHUTDOWN: | |
1434 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. | |
1435 | * Reset error counts. | |
1436 | */ | |
1437 | asoc->overall_error_count = 0; | |
1438 | ||
1439 | /* Generate a SHUTDOWN chunk. */ | |
1440 | new_obj = sctp_make_shutdown(asoc, chunk); | |
1441 | if (!new_obj) | |
1442 | goto nomem; | |
1443 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1444 | SCTP_CHUNK(new_obj)); | |
1445 | break; | |
1446 | ||
1447 | case SCTP_CMD_CHUNK_ULP: | |
1448 | /* Send a chunk to the sockets layer. */ | |
bb33381d DB |
1449 | pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n", |
1450 | __func__, cmd->obj.chunk, &asoc->ulpq); | |
1451 | ||
bd4d627d XL |
1452 | asoc->stream.si->ulpevent_data(&asoc->ulpq, |
1453 | cmd->obj.chunk, | |
1454 | GFP_ATOMIC); | |
1da177e4 LT |
1455 | break; |
1456 | ||
1457 | case SCTP_CMD_EVENT_ULP: | |
1458 | /* Send a notification to the sockets layer. */ | |
bb33381d DB |
1459 | pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n", |
1460 | __func__, cmd->obj.ulpevent, &asoc->ulpq); | |
1461 | ||
9162e0ed XL |
1462 | asoc->stream.si->enqueue_event(&asoc->ulpq, |
1463 | cmd->obj.ulpevent); | |
1da177e4 LT |
1464 | break; |
1465 | ||
1466 | case SCTP_CMD_REPLY: | |
1467 | /* If an caller has not already corked, do cork. */ | |
1468 | if (!asoc->outqueue.cork) { | |
1469 | sctp_outq_cork(&asoc->outqueue); | |
1470 | local_cork = 1; | |
1471 | } | |
1472 | /* Send a chunk to our peer. */ | |
83dbc3d4 | 1473 | sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk, gfp); |
1da177e4 LT |
1474 | break; |
1475 | ||
1476 | case SCTP_CMD_SEND_PKT: | |
1477 | /* Send a full packet to our peer. */ | |
b26ddd81 | 1478 | packet = cmd->obj.packet; |
cea8768f | 1479 | sctp_packet_transmit(packet, gfp); |
1da177e4 LT |
1480 | sctp_ootb_pkt_free(packet); |
1481 | break; | |
1482 | ||
b6157d8e VY |
1483 | case SCTP_CMD_T1_RETRAN: |
1484 | /* Mark a transport for retransmission. */ | |
1485 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1486 | SCTP_RTXR_T1_RTX); | |
1487 | break; | |
1488 | ||
1da177e4 LT |
1489 | case SCTP_CMD_RETRAN: |
1490 | /* Mark a transport for retransmission. */ | |
1491 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1492 | SCTP_RTXR_T3_RTX); | |
1493 | break; | |
1494 | ||
1da177e4 LT |
1495 | case SCTP_CMD_ECN_CE: |
1496 | /* Do delayed CE processing. */ | |
1497 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); | |
1498 | break; | |
1499 | ||
1500 | case SCTP_CMD_ECN_ECNE: | |
1501 | /* Do delayed ECNE processing. */ | |
1502 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, | |
1503 | chunk); | |
1504 | if (new_obj) | |
1505 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1506 | SCTP_CHUNK(new_obj)); | |
1507 | break; | |
1508 | ||
1509 | case SCTP_CMD_ECN_CWR: | |
1510 | /* Do delayed CWR processing. */ | |
1511 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); | |
1512 | break; | |
1513 | ||
1514 | case SCTP_CMD_SETUP_T2: | |
b26ddd81 | 1515 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1516 | break; |
1517 | ||
f8d96052 TG |
1518 | case SCTP_CMD_TIMER_START_ONCE: |
1519 | timer = &asoc->timers[cmd->obj.to]; | |
1520 | ||
1521 | if (timer_pending(timer)) | |
1522 | break; | |
1523 | /* fall through */ | |
1524 | ||
1da177e4 LT |
1525 | case SCTP_CMD_TIMER_START: |
1526 | timer = &asoc->timers[cmd->obj.to]; | |
1527 | timeout = asoc->timeouts[cmd->obj.to]; | |
09a62660 | 1528 | BUG_ON(!timeout); |
1da177e4 LT |
1529 | |
1530 | timer->expires = jiffies + timeout; | |
1531 | sctp_association_hold(asoc); | |
1532 | add_timer(timer); | |
1533 | break; | |
1534 | ||
1535 | case SCTP_CMD_TIMER_RESTART: | |
1536 | timer = &asoc->timers[cmd->obj.to]; | |
1537 | timeout = asoc->timeouts[cmd->obj.to]; | |
1538 | if (!mod_timer(timer, jiffies + timeout)) | |
1539 | sctp_association_hold(asoc); | |
1540 | break; | |
1541 | ||
1542 | case SCTP_CMD_TIMER_STOP: | |
1543 | timer = &asoc->timers[cmd->obj.to]; | |
25cc4ae9 | 1544 | if (del_timer(timer)) |
1da177e4 LT |
1545 | sctp_association_put(asoc); |
1546 | break; | |
1547 | ||
3f7a87d2 | 1548 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
b26ddd81 | 1549 | chunk = cmd->obj.chunk; |
9919b455 WY |
1550 | t = sctp_assoc_choose_alter_transport(asoc, |
1551 | asoc->init_last_sent_to); | |
3f7a87d2 FF |
1552 | asoc->init_last_sent_to = t; |
1553 | chunk->transport = t; | |
1554 | t->init_sent_count++; | |
e0e9db17 VY |
1555 | /* Set the new transport as primary */ |
1556 | sctp_assoc_set_primary(asoc, t); | |
3f7a87d2 FF |
1557 | break; |
1558 | ||
1da177e4 LT |
1559 | case SCTP_CMD_INIT_RESTART: |
1560 | /* Do the needed accounting and updates | |
1561 | * associated with restarting an initialization | |
3f7a87d2 FF |
1562 | * timer. Only multiply the timeout by two if |
1563 | * all transports have been tried at the current | |
1564 | * timeout. | |
1565 | */ | |
96cd0d3d VY |
1566 | sctp_cmd_t1_timer_update(asoc, |
1567 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
1568 | "INIT"); | |
3f7a87d2 FF |
1569 | |
1570 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
1571 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1572 | break; | |
1573 | ||
1574 | case SCTP_CMD_COOKIEECHO_RESTART: | |
1575 | /* Do the needed accounting and updates | |
1576 | * associated with restarting an initialization | |
1577 | * timer. Only multiply the timeout by two if | |
1578 | * all transports have been tried at the current | |
1579 | * timeout. | |
1da177e4 | 1580 | */ |
96cd0d3d VY |
1581 | sctp_cmd_t1_timer_update(asoc, |
1582 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
1583 | "COOKIE"); | |
1da177e4 LT |
1584 | |
1585 | /* If we've sent any data bundled with | |
1586 | * COOKIE-ECHO we need to resend. | |
1587 | */ | |
9dbc15f0 RD |
1588 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1589 | transports) { | |
b6157d8e VY |
1590 | sctp_retransmit_mark(&asoc->outqueue, t, |
1591 | SCTP_RTXR_T1_RTX); | |
1da177e4 LT |
1592 | } |
1593 | ||
1594 | sctp_add_cmd_sf(commands, | |
1595 | SCTP_CMD_TIMER_RESTART, | |
3f7a87d2 | 1596 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4 LT |
1597 | break; |
1598 | ||
1599 | case SCTP_CMD_INIT_FAILED: | |
978aa047 | 1600 | sctp_cmd_init_failed(commands, asoc, cmd->obj.u32); |
1da177e4 LT |
1601 | break; |
1602 | ||
1603 | case SCTP_CMD_ASSOC_FAILED: | |
1604 | sctp_cmd_assoc_failed(commands, asoc, event_type, | |
978aa047 | 1605 | subtype, chunk, cmd->obj.u32); |
1da177e4 LT |
1606 | break; |
1607 | ||
3f7a87d2 FF |
1608 | case SCTP_CMD_INIT_COUNTER_INC: |
1609 | asoc->init_err_counter++; | |
1da177e4 LT |
1610 | break; |
1611 | ||
3f7a87d2 FF |
1612 | case SCTP_CMD_INIT_COUNTER_RESET: |
1613 | asoc->init_err_counter = 0; | |
1614 | asoc->init_cycle = 0; | |
96cd0d3d VY |
1615 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1616 | transports) { | |
1617 | t->init_sent_count = 0; | |
1618 | } | |
1da177e4 LT |
1619 | break; |
1620 | ||
1621 | case SCTP_CMD_REPORT_DUP: | |
1622 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, | |
1623 | cmd->obj.u32); | |
1624 | break; | |
1625 | ||
1626 | case SCTP_CMD_REPORT_BAD_TAG: | |
bb33381d | 1627 | pr_debug("%s: vtag mismatch!\n", __func__); |
1da177e4 LT |
1628 | break; |
1629 | ||
1630 | case SCTP_CMD_STRIKE: | |
1631 | /* Mark one strike against a transport. */ | |
5aa93bcf NH |
1632 | sctp_do_8_2_transport_strike(commands, asoc, |
1633 | cmd->obj.transport, 0); | |
7e99013a VY |
1634 | break; |
1635 | ||
1636 | case SCTP_CMD_TRANSPORT_IDLE: | |
1637 | t = cmd->obj.transport; | |
1638 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); | |
1da177e4 LT |
1639 | break; |
1640 | ||
7e99013a | 1641 | case SCTP_CMD_TRANSPORT_HB_SENT: |
1da177e4 | 1642 | t = cmd->obj.transport; |
5aa93bcf NH |
1643 | sctp_do_8_2_transport_strike(commands, asoc, |
1644 | t, 1); | |
7e99013a | 1645 | t->hb_sent = 1; |
1da177e4 LT |
1646 | break; |
1647 | ||
1648 | case SCTP_CMD_TRANSPORT_ON: | |
1649 | t = cmd->obj.transport; | |
1650 | sctp_cmd_transport_on(commands, asoc, t, chunk); | |
1651 | break; | |
1652 | ||
1653 | case SCTP_CMD_HB_TIMERS_START: | |
1654 | sctp_cmd_hb_timers_start(commands, asoc); | |
1655 | break; | |
1656 | ||
1657 | case SCTP_CMD_HB_TIMER_UPDATE: | |
1658 | t = cmd->obj.transport; | |
ba6f5e33 | 1659 | sctp_transport_reset_hb_timer(t); |
1da177e4 LT |
1660 | break; |
1661 | ||
1662 | case SCTP_CMD_HB_TIMERS_STOP: | |
1663 | sctp_cmd_hb_timers_stop(commands, asoc); | |
1664 | break; | |
1665 | ||
1666 | case SCTP_CMD_REPORT_ERROR: | |
1667 | error = cmd->obj.error; | |
1668 | break; | |
1669 | ||
1670 | case SCTP_CMD_PROCESS_CTSN: | |
1671 | /* Dummy up a SACK for processing. */ | |
2178eda8 | 1672 | sackh.cum_tsn_ack = cmd->obj.be32; |
f6fc6bc0 XL |
1673 | sackh.a_rwnd = htonl(asoc->peer.rwnd + |
1674 | asoc->outqueue.outstanding_bytes); | |
1da177e4 LT |
1675 | sackh.num_gap_ack_blocks = 0; |
1676 | sackh.num_dup_tsns = 0; | |
f6e80abe | 1677 | chunk->subh.sack_hdr = &sackh; |
1da177e4 | 1678 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
f6e80abe | 1679 | SCTP_CHUNK(chunk)); |
1da177e4 LT |
1680 | break; |
1681 | ||
1682 | case SCTP_CMD_DISCARD_PACKET: | |
2e3216cd VY |
1683 | /* We need to discard the whole packet. |
1684 | * Uncork the queue since there might be | |
1685 | * responses pending | |
1686 | */ | |
1da177e4 | 1687 | chunk->pdiscard = 1; |
2e3216cd | 1688 | if (asoc) { |
cea8768f | 1689 | sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd VY |
1690 | local_cork = 0; |
1691 | } | |
1da177e4 LT |
1692 | break; |
1693 | ||
1694 | case SCTP_CMD_RTO_PENDING: | |
1695 | t = cmd->obj.transport; | |
1696 | t->rto_pending = 1; | |
1697 | break; | |
1698 | ||
1699 | case SCTP_CMD_PART_DELIVER: | |
be4e0ce1 | 1700 | asoc->stream.si->start_pd(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 LT |
1701 | break; |
1702 | ||
1703 | case SCTP_CMD_RENEGE: | |
94014e8d XL |
1704 | asoc->stream.si->renege_events(&asoc->ulpq, |
1705 | cmd->obj.chunk, | |
1706 | GFP_ATOMIC); | |
1da177e4 LT |
1707 | break; |
1708 | ||
1709 | case SCTP_CMD_SETUP_T4: | |
b26ddd81 | 1710 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1711 | break; |
1712 | ||
1713 | case SCTP_CMD_PROCESS_OPERR: | |
1714 | sctp_cmd_process_operr(commands, asoc, chunk); | |
1715 | break; | |
1716 | case SCTP_CMD_CLEAR_INIT_TAG: | |
1717 | asoc->peer.i.init_tag = 0; | |
1718 | break; | |
1719 | case SCTP_CMD_DEL_NON_PRIMARY: | |
1720 | sctp_cmd_del_non_primary(asoc); | |
1721 | break; | |
1722 | case SCTP_CMD_T3_RTX_TIMERS_STOP: | |
1723 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); | |
1724 | break; | |
1725 | case SCTP_CMD_FORCE_PRIM_RETRAN: | |
1726 | t = asoc->peer.retran_path; | |
1727 | asoc->peer.retran_path = asoc->peer.primary_path; | |
83dbc3d4 | 1728 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1729 | local_cork = 0; |
1730 | asoc->peer.retran_path = t; | |
1731 | break; | |
8de8c873 SS |
1732 | case SCTP_CMD_SET_SK_ERR: |
1733 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); | |
1734 | break; | |
07d93967 VY |
1735 | case SCTP_CMD_ASSOC_CHANGE: |
1736 | sctp_cmd_assoc_change(commands, asoc, | |
1737 | cmd->obj.u8); | |
1738 | break; | |
1739 | case SCTP_CMD_ADAPTATION_IND: | |
1740 | sctp_cmd_adaptation_ind(commands, asoc); | |
1741 | break; | |
30f6ebf6 XL |
1742 | case SCTP_CMD_PEER_NO_AUTH: |
1743 | sctp_cmd_peer_no_auth(commands, asoc); | |
1744 | break; | |
07d93967 | 1745 | |
730fc3d0 VY |
1746 | case SCTP_CMD_ASSOC_SHKEY: |
1747 | error = sctp_auth_asoc_init_active_key(asoc, | |
1748 | GFP_ATOMIC); | |
1749 | break; | |
f4ad85ca GJ |
1750 | case SCTP_CMD_UPDATE_INITTAG: |
1751 | asoc->peer.i.init_tag = cmd->obj.u32; | |
1752 | break; | |
9c5c62be VY |
1753 | case SCTP_CMD_SEND_MSG: |
1754 | if (!asoc->outqueue.cork) { | |
1755 | sctp_outq_cork(&asoc->outqueue); | |
1756 | local_cork = 1; | |
1757 | } | |
66388f2c | 1758 | sctp_cmd_send_msg(asoc, cmd->obj.msg, gfp); |
9c5c62be | 1759 | break; |
a000c01e WY |
1760 | case SCTP_CMD_PURGE_ASCONF_QUEUE: |
1761 | sctp_asconf_queue_teardown(asoc); | |
1762 | break; | |
d5ccd496 MM |
1763 | |
1764 | case SCTP_CMD_SET_ASOC: | |
8cd5c25f XL |
1765 | if (asoc && local_cork) { |
1766 | sctp_outq_uncork(&asoc->outqueue, gfp); | |
1767 | local_cork = 0; | |
1768 | } | |
d5ccd496 MM |
1769 | asoc = cmd->obj.asoc; |
1770 | break; | |
1771 | ||
1da177e4 | 1772 | default: |
b26ddd81 NH |
1773 | pr_warn("Impossible command: %u\n", |
1774 | cmd->verb); | |
1da177e4 | 1775 | break; |
3ff50b79 SH |
1776 | } |
1777 | ||
1da177e4 LT |
1778 | if (error) |
1779 | break; | |
1780 | } | |
1781 | ||
1782 | out: | |
2e3216cd VY |
1783 | /* If this is in response to a received chunk, wait until |
1784 | * we are done with the packet to open the queue so that we don't | |
1785 | * send multiple packets in response to a single request. | |
1786 | */ | |
1787 | if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { | |
1788 | if (chunk->end_of_packet || chunk->singleton) | |
83dbc3d4 | 1789 | sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd | 1790 | } else if (local_cork) |
83dbc3d4 | 1791 | sctp_outq_uncork(&asoc->outqueue, gfp); |
fb586f25 | 1792 | |
0970f5b3 MRL |
1793 | if (sp->data_ready_signalled) |
1794 | sp->data_ready_signalled = 0; | |
1795 | ||
1da177e4 LT |
1796 | return error; |
1797 | nomem: | |
1798 | error = -ENOMEM; | |
1799 | goto out; | |
1800 | } |