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47505b8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
60c778b2 | 2 | /* SCTP kernel implementation |
1da177e4 LT |
3 | * (C) Copyright IBM Corp. 2001, 2004 |
4 | * Copyright (c) 1999 Cisco, Inc. | |
5 | * Copyright (c) 1999-2001 Motorola, Inc. | |
6 | * | |
60c778b2 | 7 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
8 | * |
9 | * These functions work with the state functions in sctp_sm_statefuns.c | |
10 | * to implement that state operations. These functions implement the | |
11 | * steps which require modifying existing data structures. | |
12 | * | |
1da177e4 LT |
13 | * Please send any bug reports or fixes you make to the |
14 | * email address(es): | |
91705c61 | 15 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 16 | * |
1da177e4 LT |
17 | * Written or modified by: |
18 | * La Monte H.P. Yarroll <piggy@acm.org> | |
19 | * Karl Knutson <karl@athena.chicago.il.us> | |
20 | * Jon Grimm <jgrimm@austin.ibm.com> | |
21 | * Hui Huang <hui.huang@nokia.com> | |
22 | * Dajiang Zhang <dajiang.zhang@nokia.com> | |
23 | * Daisy Chang <daisyc@us.ibm.com> | |
24 | * Sridhar Samudrala <sri@us.ibm.com> | |
25 | * Ardelle Fan <ardelle.fan@intel.com> | |
1da177e4 LT |
26 | */ |
27 | ||
145ce502 JP |
28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
29 | ||
1da177e4 LT |
30 | #include <linux/skbuff.h> |
31 | #include <linux/types.h> | |
32 | #include <linux/socket.h> | |
33 | #include <linux/ip.h> | |
5a0e3ad6 | 34 | #include <linux/gfp.h> |
1da177e4 LT |
35 | #include <net/sock.h> |
36 | #include <net/sctp/sctp.h> | |
37 | #include <net/sctp/sm.h> | |
5bbbbe32 | 38 | #include <net/sctp/stream_sched.h> |
1da177e4 | 39 | |
88ee48c1 | 40 | static int sctp_cmd_interpreter(enum sctp_event_type event_type, |
bfc6f827 | 41 | union sctp_subtype subtype, |
52106019 | 42 | enum sctp_state state, |
1da177e4 LT |
43 | struct sctp_endpoint *ep, |
44 | struct sctp_association *asoc, | |
45 | void *event_arg, | |
172a1599 | 46 | enum sctp_disposition status, |
a85bbeb2 | 47 | struct sctp_cmd_seq *commands, |
dd0fc66f | 48 | gfp_t gfp); |
88ee48c1 | 49 | static int sctp_side_effects(enum sctp_event_type event_type, |
bfc6f827 | 50 | union sctp_subtype subtype, |
52106019 | 51 | enum sctp_state state, |
1da177e4 | 52 | struct sctp_endpoint *ep, |
649621e3 | 53 | struct sctp_association **asoc, |
1da177e4 | 54 | void *event_arg, |
172a1599 | 55 | enum sctp_disposition status, |
a85bbeb2 | 56 | struct sctp_cmd_seq *commands, |
dd0fc66f | 57 | gfp_t gfp); |
1da177e4 LT |
58 | |
59 | /******************************************************************** | |
60 | * Helper functions | |
61 | ********************************************************************/ | |
62 | ||
63 | /* A helper function for delayed processing of INET ECN CE bit. */ | |
d808ad9a | 64 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
1da177e4 LT |
65 | __u32 lowest_tsn) |
66 | { | |
67 | /* Save the TSN away for comparison when we receive CWR */ | |
68 | ||
69 | asoc->last_ecne_tsn = lowest_tsn; | |
70 | asoc->need_ecne = 1; | |
71 | } | |
72 | ||
73 | /* Helper function for delayed processing of SCTP ECNE chunk. */ | |
74 | /* RFC 2960 Appendix A | |
75 | * | |
76 | * RFC 2481 details a specific bit for a sender to send in | |
77 | * the header of its next outbound TCP segment to indicate to | |
78 | * its peer that it has reduced its congestion window. This | |
79 | * is termed the CWR bit. For SCTP the same indication is made | |
80 | * by including the CWR chunk. This chunk contains one data | |
81 | * element, i.e. the TSN number that was sent in the ECNE chunk. | |
82 | * This element represents the lowest TSN number in the datagram | |
83 | * that was originally marked with the CE bit. | |
84 | */ | |
85 | static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc, | |
172a1599 XL |
86 | __u32 lowest_tsn, |
87 | struct sctp_chunk *chunk) | |
1da177e4 LT |
88 | { |
89 | struct sctp_chunk *repl; | |
90 | ||
91 | /* Our previously transmitted packet ran into some congestion | |
92 | * so we should take action by reducing cwnd and ssthresh | |
93 | * and then ACK our peer that we we've done so by | |
94 | * sending a CWR. | |
95 | */ | |
96 | ||
97 | /* First, try to determine if we want to actually lower | |
98 | * our cwnd variables. Only lower them if the ECNE looks more | |
99 | * recent than the last response. | |
100 | */ | |
101 | if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) { | |
102 | struct sctp_transport *transport; | |
103 | ||
104 | /* Find which transport's congestion variables | |
105 | * need to be adjusted. | |
106 | */ | |
107 | transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn); | |
108 | ||
109 | /* Update the congestion variables. */ | |
110 | if (transport) | |
111 | sctp_transport_lower_cwnd(transport, | |
112 | SCTP_LOWER_CWND_ECNE); | |
113 | asoc->last_cwr_tsn = lowest_tsn; | |
114 | } | |
115 | ||
116 | /* Always try to quiet the other end. In case of lost CWR, | |
117 | * resend last_cwr_tsn. | |
118 | */ | |
119 | repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk); | |
120 | ||
121 | /* If we run out of memory, it will look like a lost CWR. We'll | |
122 | * get back in sync eventually. | |
123 | */ | |
124 | return repl; | |
125 | } | |
126 | ||
127 | /* Helper function to do delayed processing of ECN CWR chunk. */ | |
128 | static void sctp_do_ecn_cwr_work(struct sctp_association *asoc, | |
129 | __u32 lowest_tsn) | |
130 | { | |
131 | /* Turn off ECNE getting auto-prepended to every outgoing | |
132 | * packet | |
133 | */ | |
134 | asoc->need_ecne = 0; | |
135 | } | |
136 | ||
137 | /* Generate SACK if necessary. We call this at the end of a packet. */ | |
138 | static int sctp_gen_sack(struct sctp_association *asoc, int force, | |
a85bbeb2 | 139 | struct sctp_cmd_seq *commands) |
1da177e4 | 140 | { |
172a1599 | 141 | struct sctp_transport *trans = asoc->peer.last_data_from; |
1da177e4 LT |
142 | __u32 ctsn, max_tsn_seen; |
143 | struct sctp_chunk *sack; | |
144 | int error = 0; | |
145 | ||
d808ad9a | 146 | if (force || |
52ccb8e9 FF |
147 | (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || |
148 | (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) | |
1da177e4 LT |
149 | asoc->peer.sack_needed = 1; |
150 | ||
151 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); | |
152 | max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); | |
153 | ||
154 | /* From 12.2 Parameters necessary per association (i.e. the TCB): | |
155 | * | |
156 | * Ack State : This flag indicates if the next received packet | |
157 | * : is to be responded to with a SACK. ... | |
158 | * : When DATA chunks are out of order, SACK's | |
159 | * : are not delayed (see Section 6). | |
160 | * | |
161 | * [This is actually not mentioned in Section 6, but we | |
162 | * implement it here anyway. --piggy] | |
163 | */ | |
d808ad9a | 164 | if (max_tsn_seen != ctsn) |
1da177e4 LT |
165 | asoc->peer.sack_needed = 1; |
166 | ||
167 | /* From 6.2 Acknowledgement on Reception of DATA Chunks: | |
168 | * | |
169 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, | |
170 | * an acknowledgement SHOULD be generated for at least every | |
171 | * second packet (not every second DATA chunk) received, and | |
172 | * SHOULD be generated within 200 ms of the arrival of any | |
173 | * unacknowledged DATA chunk. ... | |
174 | */ | |
175 | if (!asoc->peer.sack_needed) { | |
d364d927 | 176 | asoc->peer.sack_cnt++; |
52ccb8e9 FF |
177 | |
178 | /* Set the SACK delay timeout based on the | |
179 | * SACK delay for the last transport | |
180 | * data was received from, or the default | |
181 | * for the association. | |
182 | */ | |
d364d927 WY |
183 | if (trans) { |
184 | /* We will need a SACK for the next packet. */ | |
185 | if (asoc->peer.sack_cnt >= trans->sackfreq - 1) | |
186 | asoc->peer.sack_needed = 1; | |
187 | ||
d808ad9a | 188 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 189 | trans->sackdelay; |
d364d927 WY |
190 | } else { |
191 | /* We will need a SACK for the next packet. */ | |
192 | if (asoc->peer.sack_cnt >= asoc->sackfreq - 1) | |
193 | asoc->peer.sack_needed = 1; | |
194 | ||
d808ad9a | 195 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
52ccb8e9 | 196 | asoc->sackdelay; |
d364d927 | 197 | } |
52ccb8e9 FF |
198 | |
199 | /* Restart the SACK timer. */ | |
200 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
201 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
1da177e4 | 202 | } else { |
07b4d6a1 MRL |
203 | __u32 old_a_rwnd = asoc->a_rwnd; |
204 | ||
90f2f531 | 205 | asoc->a_rwnd = asoc->rwnd; |
1da177e4 | 206 | sack = sctp_make_sack(asoc); |
07b4d6a1 MRL |
207 | if (!sack) { |
208 | asoc->a_rwnd = old_a_rwnd; | |
1da177e4 | 209 | goto nomem; |
07b4d6a1 | 210 | } |
1da177e4 LT |
211 | |
212 | asoc->peer.sack_needed = 0; | |
d364d927 | 213 | asoc->peer.sack_cnt = 0; |
1da177e4 | 214 | |
732ba35e | 215 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
1da177e4 LT |
216 | |
217 | /* Stop the SACK timer. */ | |
218 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, | |
219 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); | |
220 | } | |
52ccb8e9 | 221 | |
1da177e4 LT |
222 | return error; |
223 | nomem: | |
224 | error = -ENOMEM; | |
225 | return error; | |
226 | } | |
227 | ||
228 | /* When the T3-RTX timer expires, it calls this function to create the | |
229 | * relevant state machine event. | |
230 | */ | |
9c3b5751 | 231 | void sctp_generate_t3_rtx_event(struct timer_list *t) |
1da177e4 | 232 | { |
9c3b5751 KC |
233 | struct sctp_transport *transport = |
234 | from_timer(transport, t, T3_rtx_timer); | |
1da177e4 | 235 | struct sctp_association *asoc = transport->asoc; |
635682a1 KH |
236 | struct sock *sk = asoc->base.sk; |
237 | struct net *net = sock_net(sk); | |
172a1599 | 238 | int error; |
1da177e4 LT |
239 | |
240 | /* Check whether a task is in the sock. */ | |
241 | ||
635682a1 KH |
242 | bh_lock_sock(sk); |
243 | if (sock_owned_by_user(sk)) { | |
bb33381d | 244 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
245 | |
246 | /* Try again later. */ | |
247 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) | |
248 | sctp_transport_hold(transport); | |
249 | goto out_unlock; | |
250 | } | |
251 | ||
1da177e4 | 252 | /* Run through the state machine. */ |
55e26eb9 | 253 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
254 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), |
255 | asoc->state, | |
256 | asoc->ep, asoc, | |
257 | transport, GFP_ATOMIC); | |
258 | ||
259 | if (error) | |
635682a1 | 260 | sk->sk_err = -error; |
1da177e4 LT |
261 | |
262 | out_unlock: | |
635682a1 | 263 | bh_unlock_sock(sk); |
1da177e4 LT |
264 | sctp_transport_put(transport); |
265 | } | |
266 | ||
267 | /* This is a sa interface for producing timeout events. It works | |
268 | * for timeouts which use the association as their parameter. | |
269 | */ | |
270 | static void sctp_generate_timeout_event(struct sctp_association *asoc, | |
19cd1592 | 271 | enum sctp_event_timeout timeout_type) |
1da177e4 | 272 | { |
635682a1 KH |
273 | struct sock *sk = asoc->base.sk; |
274 | struct net *net = sock_net(sk); | |
1da177e4 LT |
275 | int error = 0; |
276 | ||
635682a1 KH |
277 | bh_lock_sock(sk); |
278 | if (sock_owned_by_user(sk)) { | |
bb33381d DB |
279 | pr_debug("%s: sock is busy: timer %d\n", __func__, |
280 | timeout_type); | |
1da177e4 LT |
281 | |
282 | /* Try again later. */ | |
283 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) | |
284 | sctp_association_hold(asoc); | |
285 | goto out_unlock; | |
286 | } | |
287 | ||
288 | /* Is this association really dead and just waiting around for | |
289 | * the timer to let go of the reference? | |
290 | */ | |
291 | if (asoc->base.dead) | |
292 | goto out_unlock; | |
293 | ||
294 | /* Run through the state machine. */ | |
55e26eb9 | 295 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
296 | SCTP_ST_TIMEOUT(timeout_type), |
297 | asoc->state, asoc->ep, asoc, | |
298 | (void *)timeout_type, GFP_ATOMIC); | |
299 | ||
300 | if (error) | |
635682a1 | 301 | sk->sk_err = -error; |
1da177e4 LT |
302 | |
303 | out_unlock: | |
635682a1 | 304 | bh_unlock_sock(sk); |
1da177e4 LT |
305 | sctp_association_put(asoc); |
306 | } | |
307 | ||
9c3b5751 | 308 | static void sctp_generate_t1_cookie_event(struct timer_list *t) |
1da177e4 | 309 | { |
9c3b5751 KC |
310 | struct sctp_association *asoc = |
311 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T1_COOKIE]); | |
312 | ||
1da177e4 LT |
313 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); |
314 | } | |
315 | ||
9c3b5751 | 316 | static void sctp_generate_t1_init_event(struct timer_list *t) |
1da177e4 | 317 | { |
9c3b5751 KC |
318 | struct sctp_association *asoc = |
319 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T1_INIT]); | |
320 | ||
1da177e4 LT |
321 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); |
322 | } | |
323 | ||
9c3b5751 | 324 | static void sctp_generate_t2_shutdown_event(struct timer_list *t) |
1da177e4 | 325 | { |
9c3b5751 KC |
326 | struct sctp_association *asoc = |
327 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN]); | |
328 | ||
1da177e4 LT |
329 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); |
330 | } | |
331 | ||
9c3b5751 | 332 | static void sctp_generate_t4_rto_event(struct timer_list *t) |
1da177e4 | 333 | { |
9c3b5751 KC |
334 | struct sctp_association *asoc = |
335 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_T4_RTO]); | |
336 | ||
1da177e4 LT |
337 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); |
338 | } | |
339 | ||
9c3b5751 | 340 | static void sctp_generate_t5_shutdown_guard_event(struct timer_list *t) |
1da177e4 | 341 | { |
9c3b5751 KC |
342 | struct sctp_association *asoc = |
343 | from_timer(asoc, t, | |
344 | timers[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD]); | |
345 | ||
d808ad9a | 346 | sctp_generate_timeout_event(asoc, |
1da177e4 LT |
347 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
348 | ||
349 | } /* sctp_generate_t5_shutdown_guard_event() */ | |
350 | ||
9c3b5751 | 351 | static void sctp_generate_autoclose_event(struct timer_list *t) |
1da177e4 | 352 | { |
9c3b5751 KC |
353 | struct sctp_association *asoc = |
354 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_AUTOCLOSE]); | |
355 | ||
1da177e4 LT |
356 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); |
357 | } | |
358 | ||
359 | /* Generate a heart beat event. If the sock is busy, reschedule. Make | |
360 | * sure that the transport is still valid. | |
361 | */ | |
9c3b5751 | 362 | void sctp_generate_heartbeat_event(struct timer_list *t) |
1da177e4 | 363 | { |
9c3b5751 | 364 | struct sctp_transport *transport = from_timer(transport, t, hb_timer); |
1da177e4 | 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; |
172a1599 | 369 | int error = 0; |
1da177e4 | 370 | |
635682a1 KH |
371 | bh_lock_sock(sk); |
372 | if (sock_owned_by_user(sk)) { | |
bb33381d | 373 | pr_debug("%s: sock is busy\n", __func__); |
1da177e4 LT |
374 | |
375 | /* Try again later. */ | |
376 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) | |
377 | sctp_transport_hold(transport); | |
378 | goto out_unlock; | |
379 | } | |
380 | ||
ba6f5e33 MRL |
381 | /* Check if we should still send the heartbeat or reschedule */ |
382 | elapsed = jiffies - transport->last_time_sent; | |
383 | timeout = sctp_transport_timeout(transport); | |
384 | if (elapsed < timeout) { | |
385 | elapsed = timeout - elapsed; | |
386 | if (!mod_timer(&transport->hb_timer, jiffies + elapsed)) | |
387 | sctp_transport_hold(transport); | |
388 | goto out_unlock; | |
389 | } | |
390 | ||
55e26eb9 | 391 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
1da177e4 LT |
392 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
393 | asoc->state, asoc->ep, asoc, | |
394 | transport, GFP_ATOMIC); | |
395 | ||
f05940e6 | 396 | if (error) |
635682a1 | 397 | sk->sk_err = -error; |
1da177e4 LT |
398 | |
399 | out_unlock: | |
635682a1 | 400 | bh_unlock_sock(sk); |
1da177e4 LT |
401 | sctp_transport_put(transport); |
402 | } | |
403 | ||
50b5d6ad VY |
404 | /* Handle the timeout of the ICMP protocol unreachable timer. Trigger |
405 | * the correct state machine transition that will close the association. | |
406 | */ | |
9c3b5751 | 407 | void sctp_generate_proto_unreach_event(struct timer_list *t) |
50b5d6ad | 408 | { |
9c3b5751 KC |
409 | struct sctp_transport *transport = |
410 | from_timer(transport, t, proto_unreach_timer); | |
50b5d6ad | 411 | struct sctp_association *asoc = transport->asoc; |
635682a1 KH |
412 | struct sock *sk = asoc->base.sk; |
413 | struct net *net = sock_net(sk); | |
cb3f837b | 414 | |
635682a1 KH |
415 | bh_lock_sock(sk); |
416 | if (sock_owned_by_user(sk)) { | |
bb33381d | 417 | pr_debug("%s: sock is busy\n", __func__); |
50b5d6ad VY |
418 | |
419 | /* Try again later. */ | |
420 | if (!mod_timer(&transport->proto_unreach_timer, | |
421 | jiffies + (HZ/20))) | |
057a10fa | 422 | sctp_transport_hold(transport); |
50b5d6ad VY |
423 | goto out_unlock; |
424 | } | |
425 | ||
426 | /* Is this structure just waiting around for us to actually | |
427 | * get destroyed? | |
428 | */ | |
429 | if (asoc->base.dead) | |
430 | goto out_unlock; | |
431 | ||
55e26eb9 | 432 | sctp_do_sm(net, SCTP_EVENT_T_OTHER, |
50b5d6ad VY |
433 | SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH), |
434 | asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC); | |
435 | ||
436 | out_unlock: | |
635682a1 | 437 | bh_unlock_sock(sk); |
057a10fa | 438 | sctp_transport_put(transport); |
50b5d6ad VY |
439 | } |
440 | ||
7b9438de | 441 | /* Handle the timeout of the RE-CONFIG timer. */ |
9c3b5751 | 442 | void sctp_generate_reconf_event(struct timer_list *t) |
7b9438de | 443 | { |
9c3b5751 KC |
444 | struct sctp_transport *transport = |
445 | from_timer(transport, t, reconf_timer); | |
7b9438de XL |
446 | struct sctp_association *asoc = transport->asoc; |
447 | struct sock *sk = asoc->base.sk; | |
448 | struct net *net = sock_net(sk); | |
449 | int error = 0; | |
450 | ||
451 | bh_lock_sock(sk); | |
452 | if (sock_owned_by_user(sk)) { | |
453 | pr_debug("%s: sock is busy\n", __func__); | |
454 | ||
455 | /* Try again later. */ | |
456 | if (!mod_timer(&transport->reconf_timer, jiffies + (HZ / 20))) | |
457 | sctp_transport_hold(transport); | |
458 | goto out_unlock; | |
459 | } | |
460 | ||
165e3e17 XL |
461 | /* This happens when the response arrives after the timer is triggered. */ |
462 | if (!asoc->strreset_chunk) | |
463 | goto out_unlock; | |
464 | ||
7b9438de XL |
465 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, |
466 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_RECONF), | |
467 | asoc->state, asoc->ep, asoc, | |
468 | transport, GFP_ATOMIC); | |
469 | ||
470 | if (error) | |
471 | sk->sk_err = -error; | |
472 | ||
473 | out_unlock: | |
474 | bh_unlock_sock(sk); | |
475 | sctp_transport_put(transport); | |
476 | } | |
50b5d6ad | 477 | |
92548ec2 XL |
478 | /* Handle the timeout of the probe timer. */ |
479 | void sctp_generate_probe_event(struct timer_list *t) | |
480 | { | |
481 | struct sctp_transport *transport = from_timer(transport, t, probe_timer); | |
482 | struct sctp_association *asoc = transport->asoc; | |
483 | struct sock *sk = asoc->base.sk; | |
484 | struct net *net = sock_net(sk); | |
485 | int error = 0; | |
486 | ||
487 | bh_lock_sock(sk); | |
488 | if (sock_owned_by_user(sk)) { | |
489 | pr_debug("%s: sock is busy\n", __func__); | |
490 | ||
491 | /* Try again later. */ | |
492 | if (!mod_timer(&transport->probe_timer, jiffies + (HZ / 20))) | |
493 | sctp_transport_hold(transport); | |
494 | goto out_unlock; | |
495 | } | |
496 | ||
497 | error = sctp_do_sm(net, SCTP_EVENT_T_TIMEOUT, | |
498 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_PROBE), | |
499 | asoc->state, asoc->ep, asoc, | |
500 | transport, GFP_ATOMIC); | |
501 | ||
502 | if (error) | |
503 | sk->sk_err = -error; | |
504 | ||
505 | out_unlock: | |
506 | bh_unlock_sock(sk); | |
507 | sctp_transport_put(transport); | |
508 | } | |
509 | ||
1da177e4 | 510 | /* Inject a SACK Timeout event into the state machine. */ |
9c3b5751 | 511 | static void sctp_generate_sack_event(struct timer_list *t) |
1da177e4 | 512 | { |
9c3b5751 KC |
513 | struct sctp_association *asoc = |
514 | from_timer(asoc, t, timers[SCTP_EVENT_TIMEOUT_SACK]); | |
515 | ||
1da177e4 LT |
516 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); |
517 | } | |
518 | ||
519 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { | |
9c3b5751 KC |
520 | [SCTP_EVENT_TIMEOUT_NONE] = NULL, |
521 | [SCTP_EVENT_TIMEOUT_T1_COOKIE] = sctp_generate_t1_cookie_event, | |
522 | [SCTP_EVENT_TIMEOUT_T1_INIT] = sctp_generate_t1_init_event, | |
523 | [SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = sctp_generate_t2_shutdown_event, | |
524 | [SCTP_EVENT_TIMEOUT_T3_RTX] = NULL, | |
525 | [SCTP_EVENT_TIMEOUT_T4_RTO] = sctp_generate_t4_rto_event, | |
526 | [SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD] = | |
527 | sctp_generate_t5_shutdown_guard_event, | |
528 | [SCTP_EVENT_TIMEOUT_HEARTBEAT] = NULL, | |
529 | [SCTP_EVENT_TIMEOUT_RECONF] = NULL, | |
530 | [SCTP_EVENT_TIMEOUT_SACK] = sctp_generate_sack_event, | |
531 | [SCTP_EVENT_TIMEOUT_AUTOCLOSE] = sctp_generate_autoclose_event, | |
1da177e4 LT |
532 | }; |
533 | ||
534 | ||
535 | /* RFC 2960 8.2 Path Failure Detection | |
536 | * | |
537 | * When its peer endpoint is multi-homed, an endpoint should keep a | |
538 | * error counter for each of the destination transport addresses of the | |
539 | * peer endpoint. | |
540 | * | |
541 | * Each time the T3-rtx timer expires on any address, or when a | |
542 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, | |
543 | * the error counter of that destination address will be incremented. | |
544 | * When the value in the error counter exceeds the protocol parameter | |
545 | * 'Path.Max.Retrans' of that destination address, the endpoint should | |
546 | * mark the destination transport address as inactive, and a | |
547 | * notification SHOULD be sent to the upper layer. | |
548 | * | |
549 | */ | |
a85bbeb2 | 550 | static void sctp_do_8_2_transport_strike(struct sctp_cmd_seq *commands, |
5aa93bcf | 551 | struct sctp_association *asoc, |
7e99013a VY |
552 | struct sctp_transport *transport, |
553 | int is_hb) | |
1da177e4 LT |
554 | { |
555 | /* The check for association's overall error counter exceeding the | |
556 | * threshold is done in the state function. | |
557 | */ | |
b9f84786 VY |
558 | /* We are here due to a timer expiration. If the timer was |
559 | * not a HEARTBEAT, then normal error tracking is done. | |
560 | * If the timer was a heartbeat, we only increment error counts | |
561 | * when we already have an outstanding HEARTBEAT that has not | |
562 | * been acknowledged. | |
25985edc | 563 | * Additionally, some tranport states inhibit error increments. |
ad8fec17 | 564 | */ |
b9f84786 | 565 | if (!is_hb) { |
ad8fec17 | 566 | asoc->overall_error_count++; |
b9f84786 VY |
567 | if (transport->state != SCTP_INACTIVE) |
568 | transport->error_count++; | |
569 | } else if (transport->hb_sent) { | |
570 | if (transport->state != SCTP_UNCONFIRMED) | |
571 | asoc->overall_error_count++; | |
572 | if (transport->state != SCTP_INACTIVE) | |
573 | transport->error_count++; | |
574 | } | |
1da177e4 | 575 | |
5aa93bcf | 576 | /* If the transport error count is greater than the pf_retrans |
7cce3b75 | 577 | * threshold, and less than pathmaxrtx, and if the current state |
8c2eab90 KH |
578 | * is SCTP_ACTIVE, then mark this transport as Partially Failed, |
579 | * see SCTP Quick Failover Draft, section 5.1 | |
5aa93bcf | 580 | */ |
4e7696d9 XL |
581 | if (asoc->base.net->sctp.pf_enable && |
582 | transport->state == SCTP_ACTIVE && | |
583 | transport->error_count < transport->pathmaxrxt && | |
584 | transport->error_count > transport->pf_retrans) { | |
5aa93bcf NH |
585 | |
586 | sctp_assoc_control_transport(asoc, transport, | |
587 | SCTP_TRANSPORT_PF, | |
588 | 0); | |
589 | ||
590 | /* Update the hb timer to resend a heartbeat every rto */ | |
ba6f5e33 | 591 | sctp_transport_reset_hb_timer(transport); |
5aa93bcf NH |
592 | } |
593 | ||
3f7a87d2 | 594 | if (transport->state != SCTP_INACTIVE && |
b9f84786 | 595 | (transport->error_count > transport->pathmaxrxt)) { |
bb33381d DB |
596 | pr_debug("%s: association:%p transport addr:%pISpc failed\n", |
597 | __func__, asoc, &transport->ipaddr.sa); | |
598 | ||
1da177e4 LT |
599 | sctp_assoc_control_transport(asoc, transport, |
600 | SCTP_TRANSPORT_DOWN, | |
601 | SCTP_FAILED_THRESHOLD); | |
602 | } | |
603 | ||
34515e94 XL |
604 | if (transport->error_count > transport->ps_retrans && |
605 | asoc->peer.primary_path == transport && | |
606 | asoc->peer.active_path != transport) | |
607 | sctp_assoc_set_primary(asoc, asoc->peer.active_path); | |
608 | ||
1da177e4 LT |
609 | /* E2) For the destination address for which the timer |
610 | * expires, set RTO <- RTO * 2 ("back off the timer"). The | |
611 | * maximum value discussed in rule C7 above (RTO.max) may be | |
612 | * used to provide an upper bound to this doubling operation. | |
faee47cd VY |
613 | * |
614 | * Special Case: the first HB doesn't trigger exponential backoff. | |
3ad2f3fb | 615 | * The first unacknowledged HB triggers it. We do this with a flag |
faee47cd | 616 | * that indicates that we have an outstanding HB. |
1da177e4 | 617 | */ |
7e99013a | 618 | if (!is_hb || transport->hb_sent) { |
faee47cd | 619 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
196d6759 | 620 | sctp_max_rto(asoc, transport); |
faee47cd | 621 | } |
1da177e4 LT |
622 | } |
623 | ||
624 | /* Worker routine to handle INIT command failure. */ | |
a85bbeb2 | 625 | static void sctp_cmd_init_failed(struct sctp_cmd_seq *commands, |
1da177e4 | 626 | struct sctp_association *asoc, |
95c96174 | 627 | unsigned int error) |
1da177e4 LT |
628 | { |
629 | struct sctp_ulpevent *event; | |
630 | ||
cb3f837b | 631 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_CANT_STR_ASSOC, |
a5a35e76 | 632 | (__u16)error, 0, 0, NULL, |
1da177e4 LT |
633 | GFP_ATOMIC); |
634 | ||
635 | if (event) | |
636 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
637 | SCTP_ULPEVENT(event)); | |
638 | ||
639 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, | |
640 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
641 | ||
642 | /* SEND_FAILED sent later when cleaning up the association. */ | |
643 | asoc->outqueue.error = error; | |
644 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
645 | } | |
646 | ||
647 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ | |
a85bbeb2 | 648 | static void sctp_cmd_assoc_failed(struct sctp_cmd_seq *commands, |
1da177e4 | 649 | struct sctp_association *asoc, |
88ee48c1 | 650 | enum sctp_event_type event_type, |
bfc6f827 | 651 | union sctp_subtype subtype, |
1da177e4 | 652 | struct sctp_chunk *chunk, |
95c96174 | 653 | unsigned int error) |
1da177e4 LT |
654 | { |
655 | struct sctp_ulpevent *event; | |
de4594a5 | 656 | struct sctp_chunk *abort; |
172a1599 | 657 | |
1da177e4 | 658 | /* Cancel any partial delivery in progress. */ |
65f5e357 | 659 | asoc->stream.si->abort_pd(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 | 660 | |
a5a35e76 VY |
661 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
662 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
663 | (__u16)error, 0, 0, chunk, | |
664 | GFP_ATOMIC); | |
665 | else | |
666 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, | |
667 | (__u16)error, 0, 0, NULL, | |
1da177e4 LT |
668 | GFP_ATOMIC); |
669 | if (event) | |
670 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, | |
671 | SCTP_ULPEVENT(event)); | |
672 | ||
de4594a5 NH |
673 | if (asoc->overall_error_count >= asoc->max_retrans) { |
674 | abort = sctp_make_violation_max_retrans(asoc, chunk); | |
675 | if (abort) | |
676 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
677 | SCTP_CHUNK(abort)); | |
678 | } | |
679 | ||
1da177e4 LT |
680 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
681 | SCTP_STATE(SCTP_STATE_CLOSED)); | |
682 | ||
1da177e4 LT |
683 | /* SEND_FAILED sent later when cleaning up the association. */ |
684 | asoc->outqueue.error = error; | |
685 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); | |
686 | } | |
687 | ||
688 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT | |
689 | * inside the cookie. In reality, this is only used for INIT-ACK processing | |
690 | * since all other cases use "temporary" associations and can do all | |
691 | * their work in statefuns directly. | |
692 | */ | |
a85bbeb2 | 693 | static int sctp_cmd_process_init(struct sctp_cmd_seq *commands, |
1da177e4 LT |
694 | struct sctp_association *asoc, |
695 | struct sctp_chunk *chunk, | |
01a992be | 696 | struct sctp_init_chunk *peer_init, |
dd0fc66f | 697 | gfp_t gfp) |
1da177e4 LT |
698 | { |
699 | int error; | |
700 | ||
701 | /* We only process the init as a sideeffect in a single | |
702 | * case. This is when we process the INIT-ACK. If we | |
703 | * fail during INIT processing (due to malloc problems), | |
704 | * just return the error and stop processing the stack. | |
705 | */ | |
de6becdc | 706 | if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp)) |
1da177e4 LT |
707 | error = -ENOMEM; |
708 | else | |
709 | error = 0; | |
710 | ||
711 | return error; | |
712 | } | |
713 | ||
714 | /* Helper function to break out starting up of heartbeat timers. */ | |
a85bbeb2 | 715 | static void sctp_cmd_hb_timers_start(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
716 | struct sctp_association *asoc) |
717 | { | |
718 | struct sctp_transport *t; | |
1da177e4 LT |
719 | |
720 | /* Start a heartbeat timer for each transport on the association. | |
721 | * hold a reference on the transport to make sure none of | |
722 | * the needed data structures go away. | |
723 | */ | |
ba6f5e33 MRL |
724 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) |
725 | sctp_transport_reset_hb_timer(t); | |
1da177e4 LT |
726 | } |
727 | ||
a85bbeb2 | 728 | static void sctp_cmd_hb_timers_stop(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
729 | struct sctp_association *asoc) |
730 | { | |
731 | struct sctp_transport *t; | |
1da177e4 LT |
732 | |
733 | /* Stop all heartbeat timers. */ | |
734 | ||
9dbc15f0 RD |
735 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
736 | transports) { | |
1da177e4 LT |
737 | if (del_timer(&t->hb_timer)) |
738 | sctp_transport_put(t); | |
739 | } | |
740 | } | |
741 | ||
742 | /* Helper function to stop any pending T3-RTX timers */ | |
a85bbeb2 | 743 | static void sctp_cmd_t3_rtx_timers_stop(struct sctp_cmd_seq *cmds, |
d808ad9a | 744 | struct sctp_association *asoc) |
1da177e4 LT |
745 | { |
746 | struct sctp_transport *t; | |
1da177e4 | 747 | |
9dbc15f0 RD |
748 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
749 | transports) { | |
25cc4ae9 | 750 | if (del_timer(&t->T3_rtx_timer)) |
1da177e4 | 751 | sctp_transport_put(t); |
1da177e4 LT |
752 | } |
753 | } | |
754 | ||
755 | ||
1da177e4 | 756 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ |
a85bbeb2 | 757 | static void sctp_cmd_transport_on(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
758 | struct sctp_association *asoc, |
759 | struct sctp_transport *t, | |
760 | struct sctp_chunk *chunk) | |
761 | { | |
edf903f8 | 762 | struct sctp_sender_hb_info *hbinfo; |
34d2d89f | 763 | int was_unconfirmed = 0; |
1da177e4 LT |
764 | |
765 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the | |
766 | * HEARTBEAT should clear the error counter of the destination | |
767 | * transport address to which the HEARTBEAT was sent. | |
1da177e4 LT |
768 | */ |
769 | t->error_count = 0; | |
f8d96052 TG |
770 | |
771 | /* | |
772 | * Although RFC4960 specifies that the overall error count must | |
773 | * be cleared when a HEARTBEAT ACK is received, we make an | |
774 | * exception while in SHUTDOWN PENDING. If the peer keeps its | |
775 | * window shut forever, we may never be able to transmit our | |
776 | * outstanding data and rely on the retransmission limit be reached | |
777 | * to shutdown the association. | |
778 | */ | |
f648f807 | 779 | if (t->asoc->state < SCTP_STATE_SHUTDOWN_PENDING) |
f8d96052 | 780 | t->asoc->overall_error_count = 0; |
1da177e4 | 781 | |
faee47cd VY |
782 | /* Clear the hb_sent flag to signal that we had a good |
783 | * acknowledgement. | |
784 | */ | |
785 | t->hb_sent = 0; | |
786 | ||
1da177e4 LT |
787 | /* Mark the destination transport address as active if it is not so |
788 | * marked. | |
789 | */ | |
34d2d89f MH |
790 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) { |
791 | was_unconfirmed = 1; | |
1da177e4 LT |
792 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
793 | SCTP_HEARTBEAT_SUCCESS); | |
34d2d89f | 794 | } |
1da177e4 | 795 | |
5aa93bcf NH |
796 | if (t->state == SCTP_PF) |
797 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, | |
798 | SCTP_HEARTBEAT_SUCCESS); | |
799 | ||
8c2f414a DB |
800 | /* HB-ACK was received for a the proper HB. Consider this |
801 | * forward progress. | |
802 | */ | |
803 | if (t->dst) | |
c86a773c | 804 | sctp_transport_dst_confirm(t); |
8c2f414a | 805 | |
1da177e4 LT |
806 | /* The receiver of the HEARTBEAT ACK should also perform an |
807 | * RTT measurement for that destination transport address | |
808 | * using the time value carried in the HEARTBEAT ACK chunk. | |
e533ca16 VY |
809 | * If the transport's rto_pending variable has been cleared, |
810 | * it was most likely due to a retransmit. However, we want | |
811 | * to re-enable it to properly update the rto. | |
1da177e4 | 812 | */ |
e533ca16 VY |
813 | if (t->rto_pending == 0) |
814 | t->rto_pending = 1; | |
815 | ||
edf903f8 | 816 | hbinfo = (struct sctp_sender_hb_info *)chunk->skb->data; |
1da177e4 | 817 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); |
ad8fec17 SS |
818 | |
819 | /* Update the heartbeat timer. */ | |
ba6f5e33 | 820 | sctp_transport_reset_hb_timer(t); |
34d2d89f MH |
821 | |
822 | if (was_unconfirmed && asoc->peer.transport_count == 1) | |
823 | sctp_transport_immediate_rtx(t); | |
1da177e4 LT |
824 | } |
825 | ||
1da177e4 LT |
826 | |
827 | /* Helper function to process the process SACK command. */ | |
a85bbeb2 | 828 | static int sctp_cmd_process_sack(struct sctp_cmd_seq *cmds, |
1da177e4 | 829 | struct sctp_association *asoc, |
edfee033 | 830 | struct sctp_chunk *chunk) |
1da177e4 | 831 | { |
2e3216cd | 832 | int err = 0; |
1da177e4 | 833 | |
edfee033 | 834 | if (sctp_outq_sack(&asoc->outqueue, chunk)) { |
1da177e4 | 835 | /* There are no more TSNs awaiting SACK. */ |
4e7696d9 | 836 | err = sctp_do_sm(asoc->base.net, SCTP_EVENT_T_OTHER, |
1da177e4 LT |
837 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
838 | asoc->state, asoc->ep, asoc, NULL, | |
839 | GFP_ATOMIC); | |
1da177e4 LT |
840 | } |
841 | ||
842 | return err; | |
843 | } | |
844 | ||
845 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set | |
846 | * the transport for a shutdown chunk. | |
847 | */ | |
a85bbeb2 | 848 | static void sctp_cmd_setup_t2(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
849 | struct sctp_association *asoc, |
850 | struct sctp_chunk *chunk) | |
851 | { | |
852 | struct sctp_transport *t; | |
853 | ||
c17b02b3 VY |
854 | if (chunk->transport) |
855 | t = chunk->transport; | |
856 | else { | |
857 | t = sctp_assoc_choose_alter_transport(asoc, | |
9919b455 | 858 | asoc->shutdown_last_sent_to); |
c17b02b3 VY |
859 | chunk->transport = t; |
860 | } | |
1da177e4 LT |
861 | asoc->shutdown_last_sent_to = t; |
862 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; | |
1da177e4 LT |
863 | } |
864 | ||
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 | ||
0a8dd9f6 NH |
901 | if (sctp_state(asoc, ESTABLISHED)) { |
902 | kfree(asoc->peer.cookie); | |
903 | asoc->peer.cookie = NULL; | |
904 | } | |
905 | ||
1da177e4 LT |
906 | if (sctp_state(asoc, ESTABLISHED) || |
907 | sctp_state(asoc, CLOSED) || | |
908 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { | |
909 | /* Wake up any processes waiting in the asoc's wait queue in | |
910 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). | |
d808ad9a | 911 | */ |
1da177e4 LT |
912 | if (waitqueue_active(&asoc->wait)) |
913 | wake_up_interruptible(&asoc->wait); | |
914 | ||
915 | /* Wake up any processes waiting in the sk's sleep queue of | |
916 | * a TCP-style or UDP-style peeled-off socket in | |
917 | * sctp_wait_for_accept() or sctp_wait_for_packet(). | |
918 | * For a UDP-style socket, the waiters are woken up by the | |
919 | * notifications. | |
920 | */ | |
921 | if (!sctp_style(sk, UDP)) | |
922 | sk->sk_state_change(sk); | |
923 | } | |
b7018d0b XL |
924 | |
925 | if (sctp_state(asoc, SHUTDOWN_PENDING) && | |
926 | !sctp_outq_is_empty(&asoc->outqueue)) | |
927 | sctp_outq_uncork(&asoc->outqueue, GFP_ATOMIC); | |
1da177e4 LT |
928 | } |
929 | ||
930 | /* Helper function to delete an association. */ | |
a85bbeb2 | 931 | static void sctp_cmd_delete_tcb(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
932 | struct sctp_association *asoc) |
933 | { | |
934 | struct sock *sk = asoc->base.sk; | |
935 | ||
936 | /* If it is a non-temporary association belonging to a TCP-style | |
d808ad9a | 937 | * listening socket that is not closed, do not free it so that accept() |
1da177e4 | 938 | * can pick it up later. |
d808ad9a | 939 | */ |
1da177e4 LT |
940 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
941 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) | |
942 | return; | |
943 | ||
1da177e4 LT |
944 | sctp_association_free(asoc); |
945 | } | |
946 | ||
947 | /* | |
948 | * ADDIP Section 4.1 ASCONF Chunk Procedures | |
949 | * A4) Start a T-4 RTO timer, using the RTO value of the selected | |
950 | * destination address (we use active path instead of primary path just | |
d808ad9a | 951 | * because primary path may be inactive. |
1da177e4 | 952 | */ |
a85bbeb2 XL |
953 | static void sctp_cmd_setup_t4(struct sctp_cmd_seq *cmds, |
954 | struct sctp_association *asoc, | |
955 | struct sctp_chunk *chunk) | |
1da177e4 LT |
956 | { |
957 | struct sctp_transport *t; | |
958 | ||
9919b455 | 959 | t = sctp_assoc_choose_alter_transport(asoc, chunk->transport); |
1da177e4 LT |
960 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
961 | chunk->transport = t; | |
962 | } | |
963 | ||
d808ad9a | 964 | /* Process an incoming Operation Error Chunk. */ |
a85bbeb2 | 965 | static void sctp_cmd_process_operr(struct sctp_cmd_seq *cmds, |
1da177e4 LT |
966 | struct sctp_association *asoc, |
967 | struct sctp_chunk *chunk) | |
968 | { | |
1da177e4 | 969 | struct sctp_errhdr *err_hdr; |
3df26787 WY |
970 | struct sctp_ulpevent *ev; |
971 | ||
972 | while (chunk->chunk_end > chunk->skb->data) { | |
973 | err_hdr = (struct sctp_errhdr *)(chunk->skb->data); | |
974 | ||
975 | ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, | |
976 | GFP_ATOMIC); | |
977 | if (!ev) | |
978 | return; | |
979 | ||
9162e0ed | 980 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); |
3df26787 WY |
981 | |
982 | switch (err_hdr->cause) { | |
983 | case SCTP_ERROR_UNKNOWN_CHUNK: | |
984 | { | |
922dbc5b | 985 | struct sctp_chunkhdr *unk_chunk_hdr; |
3df26787 | 986 | |
922dbc5b XL |
987 | unk_chunk_hdr = (struct sctp_chunkhdr *) |
988 | err_hdr->variable; | |
3df26787 WY |
989 | switch (unk_chunk_hdr->type) { |
990 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with | |
991 | * an ERROR chunk reporting that it did not recognized | |
992 | * the ASCONF chunk type, the sender of the ASCONF MUST | |
993 | * NOT send any further ASCONF chunks and MUST stop its | |
994 | * T-4 timer. | |
995 | */ | |
996 | case SCTP_CID_ASCONF: | |
997 | if (asoc->peer.asconf_capable == 0) | |
998 | break; | |
999 | ||
1000 | asoc->peer.asconf_capable = 0; | |
1001 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, | |
1da177e4 | 1002 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
3df26787 WY |
1003 | break; |
1004 | default: | |
1005 | break; | |
1006 | } | |
1da177e4 | 1007 | break; |
3df26787 | 1008 | } |
1da177e4 LT |
1009 | default: |
1010 | break; | |
1011 | } | |
1da177e4 LT |
1012 | } |
1013 | } | |
1014 | ||
d808ad9a | 1015 | /* Helper function to remove the association non-primary peer |
1da177e4 | 1016 | * transports. |
d808ad9a | 1017 | */ |
1da177e4 LT |
1018 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
1019 | { | |
1020 | struct sctp_transport *t; | |
1da177e4 | 1021 | struct list_head *temp; |
172a1599 | 1022 | struct list_head *pos; |
1da177e4 LT |
1023 | |
1024 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
1025 | t = list_entry(pos, struct sctp_transport, transports); | |
5f242a13 | 1026 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
d808ad9a | 1027 | &asoc->peer.primary_addr)) { |
73e67420 | 1028 | sctp_assoc_rm_peer(asoc, t); |
1da177e4 LT |
1029 | } |
1030 | } | |
1da177e4 LT |
1031 | } |
1032 | ||
8de8c873 SS |
1033 | /* Helper function to set sk_err on a 1-1 style socket. */ |
1034 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) | |
1035 | { | |
1036 | struct sock *sk = asoc->base.sk; | |
1037 | ||
1038 | if (!sctp_style(sk, UDP)) | |
1039 | sk->sk_err = error; | |
1040 | } | |
1041 | ||
07d93967 | 1042 | /* Helper function to generate an association change event */ |
a85bbeb2 XL |
1043 | static void sctp_cmd_assoc_change(struct sctp_cmd_seq *commands, |
1044 | struct sctp_association *asoc, | |
1045 | u8 state) | |
07d93967 VY |
1046 | { |
1047 | struct sctp_ulpevent *ev; | |
1048 | ||
1049 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, | |
1050 | asoc->c.sinit_num_ostreams, | |
1051 | asoc->c.sinit_max_instreams, | |
1052 | NULL, GFP_ATOMIC); | |
1053 | if (ev) | |
9162e0ed | 1054 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); |
07d93967 VY |
1055 | } |
1056 | ||
30f6ebf6 XL |
1057 | static void sctp_cmd_peer_no_auth(struct sctp_cmd_seq *commands, |
1058 | struct sctp_association *asoc) | |
1059 | { | |
1060 | struct sctp_ulpevent *ev; | |
1061 | ||
1062 | ev = sctp_ulpevent_make_authkey(asoc, 0, SCTP_AUTH_NO_AUTH, GFP_ATOMIC); | |
1063 | if (ev) | |
1064 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); | |
1065 | } | |
1066 | ||
07d93967 | 1067 | /* Helper function to generate an adaptation indication event */ |
a85bbeb2 | 1068 | static void sctp_cmd_adaptation_ind(struct sctp_cmd_seq *commands, |
07d93967 VY |
1069 | struct sctp_association *asoc) |
1070 | { | |
1071 | struct sctp_ulpevent *ev; | |
1072 | ||
1073 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); | |
1074 | ||
1075 | if (ev) | |
9162e0ed | 1076 | asoc->stream.si->enqueue_event(&asoc->ulpq, ev); |
07d93967 VY |
1077 | } |
1078 | ||
96cd0d3d VY |
1079 | |
1080 | static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, | |
19cd1592 XL |
1081 | enum sctp_event_timeout timer, |
1082 | char *name) | |
96cd0d3d VY |
1083 | { |
1084 | struct sctp_transport *t; | |
1085 | ||
1086 | t = asoc->init_last_sent_to; | |
1087 | asoc->init_err_counter++; | |
1088 | ||
1089 | if (t->init_sent_count > (asoc->init_cycle + 1)) { | |
1090 | asoc->timeouts[timer] *= 2; | |
1091 | if (asoc->timeouts[timer] > asoc->max_init_timeo) { | |
1092 | asoc->timeouts[timer] = asoc->max_init_timeo; | |
1093 | } | |
1094 | asoc->init_cycle++; | |
bb33381d DB |
1095 | |
1096 | pr_debug("%s: T1[%s] timeout adjustment init_err_counter:%d" | |
1097 | " cycle:%d timeout:%ld\n", __func__, name, | |
1098 | asoc->init_err_counter, asoc->init_cycle, | |
1099 | asoc->timeouts[timer]); | |
96cd0d3d VY |
1100 | } |
1101 | ||
1102 | } | |
1103 | ||
9c5c62be VY |
1104 | /* Send the whole message, chunk by chunk, to the outqueue. |
1105 | * This way the whole message is queued up and bundling if | |
1106 | * encouraged for small fragments. | |
1107 | */ | |
66388f2c XL |
1108 | static void sctp_cmd_send_msg(struct sctp_association *asoc, |
1109 | struct sctp_datamsg *msg, gfp_t gfp) | |
9c5c62be VY |
1110 | { |
1111 | struct sctp_chunk *chunk; | |
9c5c62be | 1112 | |
66388f2c XL |
1113 | list_for_each_entry(chunk, &msg->chunks, frag_list) |
1114 | sctp_outq_tail(&asoc->outqueue, chunk, gfp); | |
5bbbbe32 MRL |
1115 | |
1116 | asoc->outqueue.sched->enqueue(&asoc->outqueue, msg); | |
9c5c62be VY |
1117 | } |
1118 | ||
1119 | ||
1da177e4 LT |
1120 | /* These three macros allow us to pull the debugging code out of the |
1121 | * main flow of sctp_do_sm() to keep attention focused on the real | |
1122 | * functionality there. | |
1123 | */ | |
bb33381d DB |
1124 | #define debug_pre_sfn() \ |
1125 | pr_debug("%s[pre-fn]: ep:%p, %s, %s, asoc:%p[%s], %s\n", __func__, \ | |
1126 | ep, sctp_evttype_tbl[event_type], (*debug_fn)(subtype), \ | |
1127 | asoc, sctp_state_tbl[state], state_fn->name) | |
1128 | ||
1129 | #define debug_post_sfn() \ | |
1130 | pr_debug("%s[post-fn]: asoc:%p, status:%s\n", __func__, asoc, \ | |
1131 | sctp_status_tbl[status]) | |
1132 | ||
1133 | #define debug_post_sfx() \ | |
1134 | pr_debug("%s[post-sfx]: error:%d, asoc:%p[%s]\n", __func__, error, \ | |
1135 | asoc, sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ | |
1136 | sctp_assoc2id(asoc))) ? asoc->state : SCTP_STATE_CLOSED]) | |
1da177e4 LT |
1137 | |
1138 | /* | |
1139 | * This is the master state machine processing function. | |
1140 | * | |
1141 | * If you want to understand all of lksctp, this is a | |
1142 | * good place to start. | |
1143 | */ | |
88ee48c1 | 1144 | int sctp_do_sm(struct net *net, enum sctp_event_type event_type, |
bfc6f827 | 1145 | union sctp_subtype subtype, enum sctp_state state, |
61f0eb07 XL |
1146 | struct sctp_endpoint *ep, struct sctp_association *asoc, |
1147 | void *event_arg, gfp_t gfp) | |
1da177e4 | 1148 | { |
bfc6f827 | 1149 | typedef const char *(printfn_t)(union sctp_subtype); |
1da177e4 LT |
1150 | static printfn_t *table[] = { |
1151 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, | |
1152 | }; | |
1153 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; | |
172a1599 XL |
1154 | const struct sctp_sm_table_entry *state_fn; |
1155 | struct sctp_cmd_seq commands; | |
1156 | enum sctp_disposition status; | |
1157 | int error = 0; | |
1da177e4 LT |
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 | *****************************************************************/ | |
88ee48c1 | 1181 | static int sctp_side_effects(enum sctp_event_type event_type, |
bfc6f827 | 1182 | union sctp_subtype subtype, |
52106019 | 1183 | enum sctp_state state, |
1da177e4 | 1184 | struct sctp_endpoint *ep, |
649621e3 | 1185 | struct sctp_association **asoc, |
1da177e4 | 1186 | void *event_arg, |
172a1599 | 1187 | enum sctp_disposition status, |
a85bbeb2 | 1188 | struct sctp_cmd_seq *commands, |
dd0fc66f | 1189 | gfp_t gfp) |
1da177e4 LT |
1190 | { |
1191 | int error; | |
1192 | ||
1193 | /* FIXME - Most of the dispositions left today would be categorized | |
1194 | * as "exceptional" dispositions. For those dispositions, it | |
1195 | * may not be proper to run through any of the commands at all. | |
1196 | * For example, the command interpreter might be run only with | |
1197 | * disposition SCTP_DISPOSITION_CONSUME. | |
1198 | */ | |
1199 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, | |
649621e3 | 1200 | ep, *asoc, |
1da177e4 LT |
1201 | event_arg, status, |
1202 | commands, gfp))) | |
1203 | goto bail; | |
1204 | ||
1205 | switch (status) { | |
1206 | case SCTP_DISPOSITION_DISCARD: | |
bb33381d DB |
1207 | pr_debug("%s: ignored sctp protocol event - state:%d, " |
1208 | "event_type:%d, event_id:%d\n", __func__, state, | |
1209 | event_type, subtype.chunk); | |
1da177e4 LT |
1210 | break; |
1211 | ||
1212 | case SCTP_DISPOSITION_NOMEM: | |
1213 | /* We ran out of memory, so we need to discard this | |
1214 | * packet. | |
1215 | */ | |
1216 | /* BUG--we should now recover some memory, probably by | |
1217 | * reneging... | |
1218 | */ | |
1219 | error = -ENOMEM; | |
1220 | break; | |
1221 | ||
d808ad9a | 1222 | case SCTP_DISPOSITION_DELETE_TCB: |
649621e3 | 1223 | case SCTP_DISPOSITION_ABORT: |
1da177e4 | 1224 | /* This should now be a command. */ |
649621e3 | 1225 | *asoc = NULL; |
1da177e4 LT |
1226 | break; |
1227 | ||
1228 | case SCTP_DISPOSITION_CONSUME: | |
1da177e4 LT |
1229 | /* |
1230 | * We should no longer have much work to do here as the | |
1231 | * real work has been done as explicit commands above. | |
1232 | */ | |
1233 | break; | |
1234 | ||
1235 | case SCTP_DISPOSITION_VIOLATION: | |
e87cc472 JP |
1236 | net_err_ratelimited("protocol violation state %d chunkid %d\n", |
1237 | state, subtype.chunk); | |
1da177e4 LT |
1238 | break; |
1239 | ||
1240 | case SCTP_DISPOSITION_NOT_IMPL: | |
145ce502 JP |
1241 | pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n", |
1242 | state, event_type, subtype.chunk); | |
1da177e4 LT |
1243 | break; |
1244 | ||
1245 | case SCTP_DISPOSITION_BUG: | |
145ce502 | 1246 | pr_err("bug in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1247 | state, event_type, subtype.chunk); |
1248 | BUG(); | |
1249 | break; | |
1250 | ||
1251 | default: | |
145ce502 | 1252 | pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n", |
1da177e4 LT |
1253 | status, state, event_type, subtype.chunk); |
1254 | BUG(); | |
1255 | break; | |
3ff50b79 | 1256 | } |
1da177e4 LT |
1257 | |
1258 | bail: | |
1259 | return error; | |
1260 | } | |
1261 | ||
1262 | /******************************************************************** | |
1263 | * 2nd Level Abstractions | |
1264 | ********************************************************************/ | |
1265 | ||
1266 | /* This is the side-effect interpreter. */ | |
88ee48c1 | 1267 | static int sctp_cmd_interpreter(enum sctp_event_type event_type, |
bfc6f827 | 1268 | union sctp_subtype subtype, |
52106019 | 1269 | enum sctp_state state, |
1da177e4 LT |
1270 | struct sctp_endpoint *ep, |
1271 | struct sctp_association *asoc, | |
1272 | void *event_arg, | |
172a1599 | 1273 | enum sctp_disposition status, |
a85bbeb2 | 1274 | struct sctp_cmd_seq *commands, |
dd0fc66f | 1275 | gfp_t gfp) |
1da177e4 | 1276 | { |
172a1599 XL |
1277 | struct sctp_sock *sp = sctp_sk(ep->base.sk); |
1278 | struct sctp_chunk *chunk = NULL, *new_obj; | |
1da177e4 | 1279 | struct sctp_packet *packet; |
172a1599 | 1280 | struct sctp_sackhdr sackh; |
1da177e4 | 1281 | struct timer_list *timer; |
1da177e4 | 1282 | struct sctp_transport *t; |
172a1599 XL |
1283 | unsigned long timeout; |
1284 | struct sctp_cmd *cmd; | |
1da177e4 | 1285 | int local_cork = 0; |
172a1599 XL |
1286 | int error = 0; |
1287 | int force; | |
1da177e4 LT |
1288 | |
1289 | if (SCTP_EVENT_T_TIMEOUT != event_type) | |
ea110733 | 1290 | chunk = event_arg; |
1da177e4 LT |
1291 | |
1292 | /* Note: This whole file is a huge candidate for rework. | |
1293 | * For example, each command could either have its own handler, so | |
1294 | * the loop would look like: | |
1295 | * while (cmds) | |
1296 | * cmd->handle(x, y, z) | |
1297 | * --jgrimm | |
1298 | */ | |
1299 | while (NULL != (cmd = sctp_next_cmd(commands))) { | |
1300 | switch (cmd->verb) { | |
1301 | case SCTP_CMD_NOP: | |
1302 | /* Do nothing. */ | |
1303 | break; | |
1304 | ||
1305 | case SCTP_CMD_NEW_ASOC: | |
1306 | /* Register a new association. */ | |
1307 | if (local_cork) { | |
cea8768f | 1308 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1309 | local_cork = 0; |
1310 | } | |
f9e42b85 | 1311 | |
1da177e4 | 1312 | /* Register with the endpoint. */ |
f9e42b85 DB |
1313 | asoc = cmd->obj.asoc; |
1314 | BUG_ON(asoc->peer.primary_path == NULL); | |
1da177e4 | 1315 | sctp_endpoint_add_asoc(ep, asoc); |
1da177e4 LT |
1316 | break; |
1317 | ||
1da177e4 LT |
1318 | case SCTP_CMD_PURGE_OUTQUEUE: |
1319 | sctp_outq_teardown(&asoc->outqueue); | |
1320 | break; | |
1321 | ||
d808ad9a | 1322 | case SCTP_CMD_DELETE_TCB: |
1da177e4 | 1323 | if (local_cork) { |
cea8768f | 1324 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1325 | local_cork = 0; |
1326 | } | |
1327 | /* Delete the current association. */ | |
1328 | sctp_cmd_delete_tcb(commands, asoc); | |
1329 | asoc = NULL; | |
1330 | break; | |
1331 | ||
1332 | case SCTP_CMD_NEW_STATE: | |
1333 | /* Enter a new state. */ | |
1334 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); | |
1335 | break; | |
1336 | ||
1337 | case SCTP_CMD_REPORT_TSN: | |
1338 | /* Record the arrival of a TSN. */ | |
8e1ee18c | 1339 | error = sctp_tsnmap_mark(&asoc->peer.tsn_map, |
4244854d | 1340 | cmd->obj.u32, NULL); |
1da177e4 LT |
1341 | break; |
1342 | ||
1343 | case SCTP_CMD_REPORT_FWDTSN: | |
47b20a88 | 1344 | asoc->stream.si->report_ftsn(&asoc->ulpq, cmd->obj.u32); |
1da177e4 LT |
1345 | break; |
1346 | ||
1347 | case SCTP_CMD_PROCESS_FWDTSN: | |
de60fe91 XL |
1348 | asoc->stream.si->handle_ftsn(&asoc->ulpq, |
1349 | cmd->obj.chunk); | |
d808ad9a | 1350 | break; |
1da177e4 LT |
1351 | |
1352 | case SCTP_CMD_GEN_SACK: | |
1353 | /* Generate a Selective ACK. | |
1354 | * The argument tells us whether to just count | |
1355 | * the packet and MAYBE generate a SACK, or | |
1356 | * force a SACK out. | |
1357 | */ | |
1358 | force = cmd->obj.i32; | |
1359 | error = sctp_gen_sack(asoc, force, commands); | |
1360 | break; | |
1361 | ||
1362 | case SCTP_CMD_PROCESS_SACK: | |
1363 | /* Process an inbound SACK. */ | |
1364 | error = sctp_cmd_process_sack(commands, asoc, | |
b26ddd81 | 1365 | cmd->obj.chunk); |
1da177e4 LT |
1366 | break; |
1367 | ||
1368 | case SCTP_CMD_GEN_INIT_ACK: | |
1369 | /* Generate an INIT ACK chunk. */ | |
1370 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, | |
1371 | 0); | |
be7a7729 XL |
1372 | if (!new_obj) { |
1373 | error = -ENOMEM; | |
1374 | break; | |
1375 | } | |
1da177e4 LT |
1376 | |
1377 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1378 | SCTP_CHUNK(new_obj)); | |
1379 | break; | |
1380 | ||
1381 | case SCTP_CMD_PEER_INIT: | |
1382 | /* Process a unified INIT from the peer. | |
1383 | * Note: Only used during INIT-ACK processing. If | |
1384 | * there is an error just return to the outter | |
1385 | * layer which will bail. | |
1386 | */ | |
1387 | error = sctp_cmd_process_init(commands, asoc, chunk, | |
b26ddd81 | 1388 | cmd->obj.init, gfp); |
1da177e4 LT |
1389 | break; |
1390 | ||
1391 | case SCTP_CMD_GEN_COOKIE_ECHO: | |
1392 | /* Generate a COOKIE ECHO chunk. */ | |
1393 | new_obj = sctp_make_cookie_echo(asoc, chunk); | |
1394 | if (!new_obj) { | |
b26ddd81 NH |
1395 | if (cmd->obj.chunk) |
1396 | sctp_chunk_free(cmd->obj.chunk); | |
be7a7729 XL |
1397 | error = -ENOMEM; |
1398 | break; | |
1da177e4 LT |
1399 | } |
1400 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1401 | SCTP_CHUNK(new_obj)); | |
1402 | ||
1403 | /* If there is an ERROR chunk to be sent along with | |
1404 | * the COOKIE_ECHO, send it, too. | |
1405 | */ | |
b26ddd81 | 1406 | if (cmd->obj.chunk) |
1da177e4 | 1407 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
b26ddd81 | 1408 | SCTP_CHUNK(cmd->obj.chunk)); |
1da177e4 | 1409 | |
96cd0d3d VY |
1410 | if (new_obj->transport) { |
1411 | new_obj->transport->init_sent_count++; | |
1412 | asoc->init_last_sent_to = new_obj->transport; | |
1413 | } | |
1414 | ||
1da177e4 | 1415 | /* FIXME - Eventually come up with a cleaner way to |
d808ad9a YH |
1416 | * enabling COOKIE-ECHO + DATA bundling during |
1417 | * multihoming stale cookie scenarios, the following | |
1418 | * command plays with asoc->peer.retran_path to | |
1419 | * avoid the problem of sending the COOKIE-ECHO and | |
1420 | * DATA in different paths, which could result | |
1421 | * in the association being ABORTed if the DATA chunk | |
1da177e4 LT |
1422 | * is processed first by the server. Checking the |
1423 | * init error counter simply causes this command | |
1424 | * to be executed only during failed attempts of | |
1425 | * association establishment. | |
1426 | */ | |
3f7a87d2 FF |
1427 | if ((asoc->peer.retran_path != |
1428 | asoc->peer.primary_path) && | |
1429 | (asoc->init_err_counter > 0)) { | |
1430 | sctp_add_cmd_sf(commands, | |
d808ad9a | 1431 | SCTP_CMD_FORCE_PRIM_RETRAN, |
1da177e4 LT |
1432 | SCTP_NULL()); |
1433 | } | |
1434 | ||
1435 | break; | |
1436 | ||
1437 | case SCTP_CMD_GEN_SHUTDOWN: | |
1438 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. | |
1439 | * Reset error counts. | |
1440 | */ | |
1441 | asoc->overall_error_count = 0; | |
1442 | ||
1443 | /* Generate a SHUTDOWN chunk. */ | |
1444 | new_obj = sctp_make_shutdown(asoc, chunk); | |
be7a7729 XL |
1445 | if (!new_obj) { |
1446 | error = -ENOMEM; | |
1447 | break; | |
1448 | } | |
1da177e4 LT |
1449 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
1450 | SCTP_CHUNK(new_obj)); | |
1451 | break; | |
1452 | ||
1453 | case SCTP_CMD_CHUNK_ULP: | |
1454 | /* Send a chunk to the sockets layer. */ | |
bb33381d DB |
1455 | pr_debug("%s: sm_sideff: chunk_up:%p, ulpq:%p\n", |
1456 | __func__, cmd->obj.chunk, &asoc->ulpq); | |
1457 | ||
bd4d627d XL |
1458 | asoc->stream.si->ulpevent_data(&asoc->ulpq, |
1459 | cmd->obj.chunk, | |
1460 | GFP_ATOMIC); | |
1da177e4 LT |
1461 | break; |
1462 | ||
1463 | case SCTP_CMD_EVENT_ULP: | |
1464 | /* Send a notification to the sockets layer. */ | |
bb33381d DB |
1465 | pr_debug("%s: sm_sideff: event_up:%p, ulpq:%p\n", |
1466 | __func__, cmd->obj.ulpevent, &asoc->ulpq); | |
1467 | ||
9162e0ed XL |
1468 | asoc->stream.si->enqueue_event(&asoc->ulpq, |
1469 | cmd->obj.ulpevent); | |
1da177e4 LT |
1470 | break; |
1471 | ||
1472 | case SCTP_CMD_REPLY: | |
1473 | /* If an caller has not already corked, do cork. */ | |
1474 | if (!asoc->outqueue.cork) { | |
1475 | sctp_outq_cork(&asoc->outqueue); | |
1476 | local_cork = 1; | |
1477 | } | |
1478 | /* Send a chunk to our peer. */ | |
83dbc3d4 | 1479 | sctp_outq_tail(&asoc->outqueue, cmd->obj.chunk, gfp); |
1da177e4 LT |
1480 | break; |
1481 | ||
1482 | case SCTP_CMD_SEND_PKT: | |
1483 | /* Send a full packet to our peer. */ | |
b26ddd81 | 1484 | packet = cmd->obj.packet; |
cea8768f | 1485 | sctp_packet_transmit(packet, gfp); |
1da177e4 LT |
1486 | sctp_ootb_pkt_free(packet); |
1487 | break; | |
1488 | ||
b6157d8e VY |
1489 | case SCTP_CMD_T1_RETRAN: |
1490 | /* Mark a transport for retransmission. */ | |
1491 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1492 | SCTP_RTXR_T1_RTX); | |
1493 | break; | |
1494 | ||
1da177e4 LT |
1495 | case SCTP_CMD_RETRAN: |
1496 | /* Mark a transport for retransmission. */ | |
1497 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, | |
1498 | SCTP_RTXR_T3_RTX); | |
1499 | break; | |
1500 | ||
1da177e4 LT |
1501 | case SCTP_CMD_ECN_CE: |
1502 | /* Do delayed CE processing. */ | |
1503 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); | |
1504 | break; | |
1505 | ||
1506 | case SCTP_CMD_ECN_ECNE: | |
1507 | /* Do delayed ECNE processing. */ | |
1508 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, | |
1509 | chunk); | |
1510 | if (new_obj) | |
1511 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, | |
1512 | SCTP_CHUNK(new_obj)); | |
1513 | break; | |
1514 | ||
1515 | case SCTP_CMD_ECN_CWR: | |
1516 | /* Do delayed CWR processing. */ | |
1517 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); | |
1518 | break; | |
1519 | ||
1520 | case SCTP_CMD_SETUP_T2: | |
b26ddd81 | 1521 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1522 | break; |
1523 | ||
f8d96052 TG |
1524 | case SCTP_CMD_TIMER_START_ONCE: |
1525 | timer = &asoc->timers[cmd->obj.to]; | |
1526 | ||
1527 | if (timer_pending(timer)) | |
1528 | break; | |
df561f66 | 1529 | fallthrough; |
f8d96052 | 1530 | |
1da177e4 LT |
1531 | case SCTP_CMD_TIMER_START: |
1532 | timer = &asoc->timers[cmd->obj.to]; | |
1533 | timeout = asoc->timeouts[cmd->obj.to]; | |
09a62660 | 1534 | BUG_ON(!timeout); |
1da177e4 | 1535 | |
20a785aa NH |
1536 | /* |
1537 | * SCTP has a hard time with timer starts. Because we process | |
1538 | * timer starts as side effects, it can be hard to tell if we | |
1539 | * have already started a timer or not, which leads to BUG | |
1540 | * halts when we call add_timer. So here, instead of just starting | |
1541 | * a timer, if the timer is already started, and just mod | |
1542 | * the timer with the shorter of the two expiration times | |
1543 | */ | |
1544 | if (!timer_pending(timer)) | |
1545 | sctp_association_hold(asoc); | |
1546 | timer_reduce(timer, jiffies + timeout); | |
1da177e4 LT |
1547 | break; |
1548 | ||
1549 | case SCTP_CMD_TIMER_RESTART: | |
1550 | timer = &asoc->timers[cmd->obj.to]; | |
1551 | timeout = asoc->timeouts[cmd->obj.to]; | |
1552 | if (!mod_timer(timer, jiffies + timeout)) | |
1553 | sctp_association_hold(asoc); | |
1554 | break; | |
1555 | ||
1556 | case SCTP_CMD_TIMER_STOP: | |
1557 | timer = &asoc->timers[cmd->obj.to]; | |
25cc4ae9 | 1558 | if (del_timer(timer)) |
1da177e4 LT |
1559 | sctp_association_put(asoc); |
1560 | break; | |
1561 | ||
3f7a87d2 | 1562 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
b26ddd81 | 1563 | chunk = cmd->obj.chunk; |
9919b455 WY |
1564 | t = sctp_assoc_choose_alter_transport(asoc, |
1565 | asoc->init_last_sent_to); | |
3f7a87d2 FF |
1566 | asoc->init_last_sent_to = t; |
1567 | chunk->transport = t; | |
1568 | t->init_sent_count++; | |
e0e9db17 VY |
1569 | /* Set the new transport as primary */ |
1570 | sctp_assoc_set_primary(asoc, t); | |
3f7a87d2 FF |
1571 | break; |
1572 | ||
1da177e4 LT |
1573 | case SCTP_CMD_INIT_RESTART: |
1574 | /* Do the needed accounting and updates | |
1575 | * associated with restarting an initialization | |
3f7a87d2 FF |
1576 | * timer. Only multiply the timeout by two if |
1577 | * all transports have been tried at the current | |
1578 | * timeout. | |
1579 | */ | |
96cd0d3d VY |
1580 | sctp_cmd_t1_timer_update(asoc, |
1581 | SCTP_EVENT_TIMEOUT_T1_INIT, | |
1582 | "INIT"); | |
3f7a87d2 FF |
1583 | |
1584 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, | |
1585 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); | |
1586 | break; | |
1587 | ||
1588 | case SCTP_CMD_COOKIEECHO_RESTART: | |
1589 | /* Do the needed accounting and updates | |
1590 | * associated with restarting an initialization | |
1591 | * timer. Only multiply the timeout by two if | |
1592 | * all transports have been tried at the current | |
1593 | * timeout. | |
1da177e4 | 1594 | */ |
96cd0d3d VY |
1595 | sctp_cmd_t1_timer_update(asoc, |
1596 | SCTP_EVENT_TIMEOUT_T1_COOKIE, | |
1597 | "COOKIE"); | |
1da177e4 LT |
1598 | |
1599 | /* If we've sent any data bundled with | |
1600 | * COOKIE-ECHO we need to resend. | |
1601 | */ | |
9dbc15f0 RD |
1602 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1603 | transports) { | |
b6157d8e VY |
1604 | sctp_retransmit_mark(&asoc->outqueue, t, |
1605 | SCTP_RTXR_T1_RTX); | |
1da177e4 LT |
1606 | } |
1607 | ||
1608 | sctp_add_cmd_sf(commands, | |
1609 | SCTP_CMD_TIMER_RESTART, | |
3f7a87d2 | 1610 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
1da177e4 LT |
1611 | break; |
1612 | ||
1613 | case SCTP_CMD_INIT_FAILED: | |
b6df8c81 | 1614 | sctp_cmd_init_failed(commands, asoc, cmd->obj.u16); |
1da177e4 LT |
1615 | break; |
1616 | ||
1617 | case SCTP_CMD_ASSOC_FAILED: | |
1618 | sctp_cmd_assoc_failed(commands, asoc, event_type, | |
b6df8c81 | 1619 | subtype, chunk, cmd->obj.u16); |
1da177e4 LT |
1620 | break; |
1621 | ||
3f7a87d2 FF |
1622 | case SCTP_CMD_INIT_COUNTER_INC: |
1623 | asoc->init_err_counter++; | |
1da177e4 LT |
1624 | break; |
1625 | ||
3f7a87d2 FF |
1626 | case SCTP_CMD_INIT_COUNTER_RESET: |
1627 | asoc->init_err_counter = 0; | |
1628 | asoc->init_cycle = 0; | |
96cd0d3d VY |
1629 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1630 | transports) { | |
1631 | t->init_sent_count = 0; | |
1632 | } | |
1da177e4 LT |
1633 | break; |
1634 | ||
1635 | case SCTP_CMD_REPORT_DUP: | |
1636 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, | |
1637 | cmd->obj.u32); | |
1638 | break; | |
1639 | ||
1640 | case SCTP_CMD_REPORT_BAD_TAG: | |
bb33381d | 1641 | pr_debug("%s: vtag mismatch!\n", __func__); |
1da177e4 LT |
1642 | break; |
1643 | ||
1644 | case SCTP_CMD_STRIKE: | |
1645 | /* Mark one strike against a transport. */ | |
5aa93bcf NH |
1646 | sctp_do_8_2_transport_strike(commands, asoc, |
1647 | cmd->obj.transport, 0); | |
7e99013a VY |
1648 | break; |
1649 | ||
1650 | case SCTP_CMD_TRANSPORT_IDLE: | |
1651 | t = cmd->obj.transport; | |
1652 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); | |
1da177e4 LT |
1653 | break; |
1654 | ||
7e99013a | 1655 | case SCTP_CMD_TRANSPORT_HB_SENT: |
1da177e4 | 1656 | t = cmd->obj.transport; |
5aa93bcf NH |
1657 | sctp_do_8_2_transport_strike(commands, asoc, |
1658 | t, 1); | |
7e99013a | 1659 | t->hb_sent = 1; |
1da177e4 LT |
1660 | break; |
1661 | ||
1662 | case SCTP_CMD_TRANSPORT_ON: | |
1663 | t = cmd->obj.transport; | |
1664 | sctp_cmd_transport_on(commands, asoc, t, chunk); | |
1665 | break; | |
1666 | ||
1667 | case SCTP_CMD_HB_TIMERS_START: | |
1668 | sctp_cmd_hb_timers_start(commands, asoc); | |
1669 | break; | |
1670 | ||
1671 | case SCTP_CMD_HB_TIMER_UPDATE: | |
1672 | t = cmd->obj.transport; | |
ba6f5e33 | 1673 | sctp_transport_reset_hb_timer(t); |
1da177e4 LT |
1674 | break; |
1675 | ||
1676 | case SCTP_CMD_HB_TIMERS_STOP: | |
1677 | sctp_cmd_hb_timers_stop(commands, asoc); | |
1678 | break; | |
1679 | ||
92548ec2 XL |
1680 | case SCTP_CMD_PROBE_TIMER_UPDATE: |
1681 | t = cmd->obj.transport; | |
1682 | sctp_transport_reset_probe_timer(t); | |
1683 | break; | |
1684 | ||
1da177e4 LT |
1685 | case SCTP_CMD_REPORT_ERROR: |
1686 | error = cmd->obj.error; | |
1687 | break; | |
1688 | ||
1689 | case SCTP_CMD_PROCESS_CTSN: | |
1690 | /* Dummy up a SACK for processing. */ | |
2178eda8 | 1691 | sackh.cum_tsn_ack = cmd->obj.be32; |
f6fc6bc0 XL |
1692 | sackh.a_rwnd = htonl(asoc->peer.rwnd + |
1693 | asoc->outqueue.outstanding_bytes); | |
1da177e4 LT |
1694 | sackh.num_gap_ack_blocks = 0; |
1695 | sackh.num_dup_tsns = 0; | |
f6e80abe | 1696 | chunk->subh.sack_hdr = &sackh; |
1da177e4 | 1697 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
f6e80abe | 1698 | SCTP_CHUNK(chunk)); |
1da177e4 LT |
1699 | break; |
1700 | ||
1701 | case SCTP_CMD_DISCARD_PACKET: | |
2e3216cd VY |
1702 | /* We need to discard the whole packet. |
1703 | * Uncork the queue since there might be | |
1704 | * responses pending | |
1705 | */ | |
1da177e4 | 1706 | chunk->pdiscard = 1; |
2e3216cd | 1707 | if (asoc) { |
cea8768f | 1708 | sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd VY |
1709 | local_cork = 0; |
1710 | } | |
1da177e4 LT |
1711 | break; |
1712 | ||
1713 | case SCTP_CMD_RTO_PENDING: | |
1714 | t = cmd->obj.transport; | |
1715 | t->rto_pending = 1; | |
1716 | break; | |
1717 | ||
1718 | case SCTP_CMD_PART_DELIVER: | |
be4e0ce1 | 1719 | asoc->stream.si->start_pd(&asoc->ulpq, GFP_ATOMIC); |
1da177e4 LT |
1720 | break; |
1721 | ||
1722 | case SCTP_CMD_RENEGE: | |
94014e8d XL |
1723 | asoc->stream.si->renege_events(&asoc->ulpq, |
1724 | cmd->obj.chunk, | |
1725 | GFP_ATOMIC); | |
1da177e4 LT |
1726 | break; |
1727 | ||
1728 | case SCTP_CMD_SETUP_T4: | |
b26ddd81 | 1729 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.chunk); |
1da177e4 LT |
1730 | break; |
1731 | ||
1732 | case SCTP_CMD_PROCESS_OPERR: | |
1733 | sctp_cmd_process_operr(commands, asoc, chunk); | |
1734 | break; | |
1735 | case SCTP_CMD_CLEAR_INIT_TAG: | |
1736 | asoc->peer.i.init_tag = 0; | |
1737 | break; | |
1738 | case SCTP_CMD_DEL_NON_PRIMARY: | |
1739 | sctp_cmd_del_non_primary(asoc); | |
1740 | break; | |
1741 | case SCTP_CMD_T3_RTX_TIMERS_STOP: | |
1742 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); | |
1743 | break; | |
1744 | case SCTP_CMD_FORCE_PRIM_RETRAN: | |
1745 | t = asoc->peer.retran_path; | |
1746 | asoc->peer.retran_path = asoc->peer.primary_path; | |
83dbc3d4 | 1747 | sctp_outq_uncork(&asoc->outqueue, gfp); |
1da177e4 LT |
1748 | local_cork = 0; |
1749 | asoc->peer.retran_path = t; | |
1750 | break; | |
8de8c873 SS |
1751 | case SCTP_CMD_SET_SK_ERR: |
1752 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); | |
1753 | break; | |
07d93967 VY |
1754 | case SCTP_CMD_ASSOC_CHANGE: |
1755 | sctp_cmd_assoc_change(commands, asoc, | |
1756 | cmd->obj.u8); | |
1757 | break; | |
1758 | case SCTP_CMD_ADAPTATION_IND: | |
1759 | sctp_cmd_adaptation_ind(commands, asoc); | |
1760 | break; | |
30f6ebf6 XL |
1761 | case SCTP_CMD_PEER_NO_AUTH: |
1762 | sctp_cmd_peer_no_auth(commands, asoc); | |
1763 | break; | |
07d93967 | 1764 | |
730fc3d0 VY |
1765 | case SCTP_CMD_ASSOC_SHKEY: |
1766 | error = sctp_auth_asoc_init_active_key(asoc, | |
1767 | GFP_ATOMIC); | |
1768 | break; | |
f4ad85ca GJ |
1769 | case SCTP_CMD_UPDATE_INITTAG: |
1770 | asoc->peer.i.init_tag = cmd->obj.u32; | |
1771 | break; | |
9c5c62be VY |
1772 | case SCTP_CMD_SEND_MSG: |
1773 | if (!asoc->outqueue.cork) { | |
1774 | sctp_outq_cork(&asoc->outqueue); | |
1775 | local_cork = 1; | |
1776 | } | |
66388f2c | 1777 | sctp_cmd_send_msg(asoc, cmd->obj.msg, gfp); |
9c5c62be | 1778 | break; |
a000c01e WY |
1779 | case SCTP_CMD_PURGE_ASCONF_QUEUE: |
1780 | sctp_asconf_queue_teardown(asoc); | |
1781 | break; | |
d5ccd496 MM |
1782 | |
1783 | case SCTP_CMD_SET_ASOC: | |
8cd5c25f XL |
1784 | if (asoc && local_cork) { |
1785 | sctp_outq_uncork(&asoc->outqueue, gfp); | |
1786 | local_cork = 0; | |
1787 | } | |
d5ccd496 MM |
1788 | asoc = cmd->obj.asoc; |
1789 | break; | |
1790 | ||
1da177e4 | 1791 | default: |
b26ddd81 NH |
1792 | pr_warn("Impossible command: %u\n", |
1793 | cmd->verb); | |
1da177e4 | 1794 | break; |
3ff50b79 SH |
1795 | } |
1796 | ||
be7a7729 XL |
1797 | if (error) { |
1798 | cmd = sctp_next_cmd(commands); | |
1799 | while (cmd) { | |
1800 | if (cmd->verb == SCTP_CMD_REPLY) | |
1801 | sctp_chunk_free(cmd->obj.chunk); | |
1802 | cmd = sctp_next_cmd(commands); | |
1803 | } | |
1da177e4 | 1804 | break; |
be7a7729 | 1805 | } |
1da177e4 LT |
1806 | } |
1807 | ||
2e3216cd VY |
1808 | /* If this is in response to a received chunk, wait until |
1809 | * we are done with the packet to open the queue so that we don't | |
1810 | * send multiple packets in response to a single request. | |
1811 | */ | |
1812 | if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { | |
1813 | if (chunk->end_of_packet || chunk->singleton) | |
83dbc3d4 | 1814 | sctp_outq_uncork(&asoc->outqueue, gfp); |
2e3216cd | 1815 | } else if (local_cork) |
83dbc3d4 | 1816 | sctp_outq_uncork(&asoc->outqueue, gfp); |
fb586f25 | 1817 | |
0970f5b3 MRL |
1818 | if (sp->data_ready_signalled) |
1819 | sp->data_ready_signalled = 0; | |
1820 | ||
1da177e4 | 1821 | return error; |
1da177e4 | 1822 | } |