Commit | Line | Data |
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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001 Intel Corp. | |
6 | * Copyright (c) 2001 La Monte H.P. Yarroll | |
7 | * | |
60c778b2 | 8 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
9 | * |
10 | * This module provides the abstraction for an SCTP association. | |
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 | |
25 | * along with GNU CC; see the file COPYING. If not, write to | |
26 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
27 | * Boston, MA 02111-1307, USA. | |
28 | * | |
29 | * Please send any bug reports or fixes you make to the | |
30 | * email address(es): | |
31 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
32 | * | |
33 | * Or submit a bug report through the following website: | |
34 | * http://www.sf.net/projects/lksctp | |
35 | * | |
36 | * Written or modified by: | |
37 | * La Monte H.P. Yarroll <piggy@acm.org> | |
38 | * Karl Knutson <karl@athena.chicago.il.us> | |
39 | * Jon Grimm <jgrimm@us.ibm.com> | |
40 | * Xingang Guo <xingang.guo@intel.com> | |
41 | * Hui Huang <hui.huang@nokia.com> | |
42 | * Sridhar Samudrala <sri@us.ibm.com> | |
43 | * Daisy Chang <daisyc@us.ibm.com> | |
44 | * Ryan Layer <rmlayer@us.ibm.com> | |
45 | * Kevin Gao <kevin.gao@intel.com> | |
46 | * | |
47 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
48 | * be incorporated into the next SCTP release. | |
49 | */ | |
50 | ||
145ce502 JP |
51 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
52 | ||
1da177e4 LT |
53 | #include <linux/types.h> |
54 | #include <linux/fcntl.h> | |
55 | #include <linux/poll.h> | |
56 | #include <linux/init.h> | |
1da177e4 LT |
57 | |
58 | #include <linux/slab.h> | |
59 | #include <linux/in.h> | |
60 | #include <net/ipv6.h> | |
61 | #include <net/sctp/sctp.h> | |
62 | #include <net/sctp/sm.h> | |
63 | ||
64 | /* Forward declarations for internal functions. */ | |
c4028958 | 65 | static void sctp_assoc_bh_rcv(struct work_struct *work); |
a08de64d | 66 | static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc); |
8b4472cc | 67 | static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc); |
1da177e4 | 68 | |
4814326b VY |
69 | /* Keep track of the new idr low so that we don't re-use association id |
70 | * numbers too fast. It is protected by they idr spin lock is in the | |
71 | * range of 1 - INT_MAX. | |
72 | */ | |
73 | static u32 idr_low = 1; | |
74 | ||
1da177e4 LT |
75 | |
76 | /* 1st Level Abstractions. */ | |
77 | ||
78 | /* Initialize a new association from provided memory. */ | |
79 | static struct sctp_association *sctp_association_init(struct sctp_association *asoc, | |
80 | const struct sctp_endpoint *ep, | |
81 | const struct sock *sk, | |
82 | sctp_scope_t scope, | |
dd0fc66f | 83 | gfp_t gfp) |
1da177e4 | 84 | { |
e1fc3b14 | 85 | struct net *net = sock_net(sk); |
1da177e4 LT |
86 | struct sctp_sock *sp; |
87 | int i; | |
a29a5bd4 VY |
88 | sctp_paramhdr_t *p; |
89 | int err; | |
1da177e4 LT |
90 | |
91 | /* Retrieve the SCTP per socket area. */ | |
92 | sp = sctp_sk((struct sock *)sk); | |
93 | ||
1da177e4 LT |
94 | /* Discarding const is appropriate here. */ |
95 | asoc->ep = (struct sctp_endpoint *)ep; | |
96 | sctp_endpoint_hold(asoc->ep); | |
97 | ||
98 | /* Hold the sock. */ | |
99 | asoc->base.sk = (struct sock *)sk; | |
100 | sock_hold(asoc->base.sk); | |
101 | ||
102 | /* Initialize the common base substructure. */ | |
103 | asoc->base.type = SCTP_EP_TYPE_ASSOCIATION; | |
104 | ||
105 | /* Initialize the object handling fields. */ | |
106 | atomic_set(&asoc->base.refcnt, 1); | |
107 | asoc->base.dead = 0; | |
108 | asoc->base.malloced = 0; | |
109 | ||
110 | /* Initialize the bind addr area. */ | |
111 | sctp_bind_addr_init(&asoc->base.bind_addr, ep->base.bind_addr.port); | |
1da177e4 LT |
112 | |
113 | asoc->state = SCTP_STATE_CLOSED; | |
114 | ||
115 | /* Set these values from the socket values, a conversion between | |
116 | * millsecons to seconds/microseconds must also be done. | |
117 | */ | |
118 | asoc->cookie_life.tv_sec = sp->assocparams.sasoc_cookie_life / 1000; | |
119 | asoc->cookie_life.tv_usec = (sp->assocparams.sasoc_cookie_life % 1000) | |
120 | * 1000; | |
1da177e4 | 121 | asoc->frag_point = 0; |
f68b2e05 | 122 | asoc->user_frag = sp->user_frag; |
1da177e4 LT |
123 | |
124 | /* Set the association max_retrans and RTO values from the | |
125 | * socket values. | |
126 | */ | |
127 | asoc->max_retrans = sp->assocparams.sasoc_asocmaxrxt; | |
e1fc3b14 | 128 | asoc->pf_retrans = net->sctp.pf_retrans; |
5aa93bcf | 129 | |
1da177e4 LT |
130 | asoc->rto_initial = msecs_to_jiffies(sp->rtoinfo.srto_initial); |
131 | asoc->rto_max = msecs_to_jiffies(sp->rtoinfo.srto_max); | |
132 | asoc->rto_min = msecs_to_jiffies(sp->rtoinfo.srto_min); | |
133 | ||
134 | asoc->overall_error_count = 0; | |
135 | ||
52ccb8e9 FF |
136 | /* Initialize the association's heartbeat interval based on the |
137 | * sock configured value. | |
138 | */ | |
139 | asoc->hbinterval = msecs_to_jiffies(sp->hbinterval); | |
140 | ||
141 | /* Initialize path max retrans value. */ | |
142 | asoc->pathmaxrxt = sp->pathmaxrxt; | |
143 | ||
144 | /* Initialize default path MTU. */ | |
145 | asoc->pathmtu = sp->pathmtu; | |
146 | ||
147 | /* Set association default SACK delay */ | |
148 | asoc->sackdelay = msecs_to_jiffies(sp->sackdelay); | |
d364d927 | 149 | asoc->sackfreq = sp->sackfreq; |
52ccb8e9 FF |
150 | |
151 | /* Set the association default flags controlling | |
152 | * Heartbeat, SACK delay, and Path MTU Discovery. | |
153 | */ | |
154 | asoc->param_flags = sp->param_flags; | |
155 | ||
1da177e4 LT |
156 | /* Initialize the maximum mumber of new data packets that can be sent |
157 | * in a burst. | |
158 | */ | |
70331571 | 159 | asoc->max_burst = sp->max_burst; |
1da177e4 | 160 | |
1e7d3d90 VY |
161 | /* initialize association timers */ |
162 | asoc->timeouts[SCTP_EVENT_TIMEOUT_NONE] = 0; | |
163 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = asoc->rto_initial; | |
164 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = asoc->rto_initial; | |
165 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = asoc->rto_initial; | |
166 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] = 0; | |
167 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = 0; | |
168 | ||
169 | /* sctpimpguide Section 2.12.2 | |
170 | * If the 'T5-shutdown-guard' timer is used, it SHOULD be set to the | |
171 | * recommended value of 5 times 'RTO.Max'. | |
172 | */ | |
d808ad9a | 173 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD] |
1e7d3d90 VY |
174 | = 5 * asoc->rto_max; |
175 | ||
176 | asoc->timeouts[SCTP_EVENT_TIMEOUT_HEARTBEAT] = 0; | |
52ccb8e9 | 177 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = asoc->sackdelay; |
1e7d3d90 | 178 | asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] = |
e1fc3b14 | 179 | min_t(unsigned long, sp->autoclose, net->sctp.max_autoclose) * HZ; |
d808ad9a | 180 | |
421f91d2 | 181 | /* Initializes the timers */ |
b24b8a24 PE |
182 | for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) |
183 | setup_timer(&asoc->timers[i], sctp_timer_events[i], | |
184 | (unsigned long)asoc); | |
1da177e4 LT |
185 | |
186 | /* Pull default initialization values from the sock options. | |
187 | * Note: This assumes that the values have already been | |
188 | * validated in the sock. | |
189 | */ | |
190 | asoc->c.sinit_max_instreams = sp->initmsg.sinit_max_instreams; | |
191 | asoc->c.sinit_num_ostreams = sp->initmsg.sinit_num_ostreams; | |
192 | asoc->max_init_attempts = sp->initmsg.sinit_max_attempts; | |
193 | ||
194 | asoc->max_init_timeo = | |
195 | msecs_to_jiffies(sp->initmsg.sinit_max_init_timeo); | |
196 | ||
197 | /* Allocate storage for the ssnmap after the inbound and outbound | |
198 | * streams have been negotiated during Init. | |
199 | */ | |
200 | asoc->ssnmap = NULL; | |
201 | ||
202 | /* Set the local window size for receive. | |
203 | * This is also the rcvbuf space per association. | |
204 | * RFC 6 - A SCTP receiver MUST be able to receive a minimum of | |
205 | * 1500 bytes in one SCTP packet. | |
206 | */ | |
049b3ff5 | 207 | if ((sk->sk_rcvbuf/2) < SCTP_DEFAULT_MINWINDOW) |
1da177e4 LT |
208 | asoc->rwnd = SCTP_DEFAULT_MINWINDOW; |
209 | else | |
049b3ff5 | 210 | asoc->rwnd = sk->sk_rcvbuf/2; |
1da177e4 LT |
211 | |
212 | asoc->a_rwnd = asoc->rwnd; | |
213 | ||
214 | asoc->rwnd_over = 0; | |
4d3c46e6 | 215 | asoc->rwnd_press = 0; |
1da177e4 LT |
216 | |
217 | /* Use my own max window until I learn something better. */ | |
218 | asoc->peer.rwnd = SCTP_DEFAULT_MAXWINDOW; | |
219 | ||
220 | /* Set the sndbuf size for transmit. */ | |
221 | asoc->sndbuf_used = 0; | |
222 | ||
049b3ff5 NH |
223 | /* Initialize the receive memory counter */ |
224 | atomic_set(&asoc->rmem_alloc, 0); | |
225 | ||
1da177e4 LT |
226 | init_waitqueue_head(&asoc->wait); |
227 | ||
228 | asoc->c.my_vtag = sctp_generate_tag(ep); | |
229 | asoc->peer.i.init_tag = 0; /* INIT needs a vtag of 0. */ | |
230 | asoc->c.peer_vtag = 0; | |
231 | asoc->c.my_ttag = 0; | |
232 | asoc->c.peer_ttag = 0; | |
233 | asoc->c.my_port = ep->base.bind_addr.port; | |
234 | ||
235 | asoc->c.initial_tsn = sctp_generate_tsn(ep); | |
236 | ||
237 | asoc->next_tsn = asoc->c.initial_tsn; | |
238 | ||
239 | asoc->ctsn_ack_point = asoc->next_tsn - 1; | |
240 | asoc->adv_peer_ack_point = asoc->ctsn_ack_point; | |
241 | asoc->highest_sacked = asoc->ctsn_ack_point; | |
242 | asoc->last_cwr_tsn = asoc->ctsn_ack_point; | |
243 | asoc->unack_data = 0; | |
244 | ||
1da177e4 LT |
245 | /* ADDIP Section 4.1 Asconf Chunk Procedures |
246 | * | |
247 | * When an endpoint has an ASCONF signaled change to be sent to the | |
248 | * remote endpoint it should do the following: | |
249 | * ... | |
250 | * A2) a serial number should be assigned to the chunk. The serial | |
251 | * number SHOULD be a monotonically increasing number. The serial | |
252 | * numbers SHOULD be initialized at the start of the | |
253 | * association to the same value as the initial TSN. | |
254 | */ | |
255 | asoc->addip_serial = asoc->c.initial_tsn; | |
256 | ||
79af02c2 | 257 | INIT_LIST_HEAD(&asoc->addip_chunk_list); |
a08de64d | 258 | INIT_LIST_HEAD(&asoc->asconf_ack_list); |
1da177e4 LT |
259 | |
260 | /* Make an empty list of remote transport addresses. */ | |
261 | INIT_LIST_HEAD(&asoc->peer.transport_addr_list); | |
3f7a87d2 | 262 | asoc->peer.transport_count = 0; |
1da177e4 LT |
263 | |
264 | /* RFC 2960 5.1 Normal Establishment of an Association | |
265 | * | |
266 | * After the reception of the first data chunk in an | |
267 | * association the endpoint must immediately respond with a | |
268 | * sack to acknowledge the data chunk. Subsequent | |
269 | * acknowledgements should be done as described in Section | |
270 | * 6.2. | |
271 | * | |
272 | * [We implement this by telling a new association that it | |
273 | * already received one packet.] | |
274 | */ | |
275 | asoc->peer.sack_needed = 1; | |
d364d927 | 276 | asoc->peer.sack_cnt = 0; |
4244854d | 277 | asoc->peer.sack_generation = 1; |
1da177e4 | 278 | |
73d9c4fd VY |
279 | /* Assume that the peer will tell us if he recognizes ASCONF |
280 | * as part of INIT exchange. | |
281 | * The sctp_addip_noauth option is there for backward compatibilty | |
282 | * and will revert old behavior. | |
1da177e4 | 283 | */ |
88799fe5 | 284 | asoc->peer.asconf_capable = 0; |
e1fc3b14 | 285 | if (net->sctp.addip_noauth) |
73d9c4fd | 286 | asoc->peer.asconf_capable = 1; |
8a07eb0a MH |
287 | asoc->asconf_addr_del_pending = NULL; |
288 | asoc->src_out_of_asoc_ok = 0; | |
6af29ccc | 289 | asoc->new_transport = NULL; |
1da177e4 LT |
290 | |
291 | /* Create an input queue. */ | |
292 | sctp_inq_init(&asoc->base.inqueue); | |
c4028958 | 293 | sctp_inq_set_th_handler(&asoc->base.inqueue, sctp_assoc_bh_rcv); |
1da177e4 LT |
294 | |
295 | /* Create an output queue. */ | |
296 | sctp_outq_init(asoc, &asoc->outqueue); | |
297 | ||
298 | if (!sctp_ulpq_init(&asoc->ulpq, asoc)) | |
299 | goto fail_init; | |
300 | ||
8e1ee18c | 301 | memset(&asoc->peer.tsn_map, 0, sizeof(struct sctp_tsnmap)); |
1da177e4 LT |
302 | |
303 | asoc->need_ecne = 0; | |
304 | ||
305 | asoc->assoc_id = 0; | |
306 | ||
307 | /* Assume that peer would support both address types unless we are | |
308 | * told otherwise. | |
309 | */ | |
310 | asoc->peer.ipv4_address = 1; | |
a2c39584 WY |
311 | if (asoc->base.sk->sk_family == PF_INET6) |
312 | asoc->peer.ipv6_address = 1; | |
1da177e4 LT |
313 | INIT_LIST_HEAD(&asoc->asocs); |
314 | ||
315 | asoc->autoclose = sp->autoclose; | |
316 | ||
317 | asoc->default_stream = sp->default_stream; | |
318 | asoc->default_ppid = sp->default_ppid; | |
319 | asoc->default_flags = sp->default_flags; | |
320 | asoc->default_context = sp->default_context; | |
321 | asoc->default_timetolive = sp->default_timetolive; | |
6ab792f5 | 322 | asoc->default_rcv_context = sp->default_rcv_context; |
1da177e4 | 323 | |
196d6759 MB |
324 | /* SCTP_GET_ASSOC_STATS COUNTERS */ |
325 | memset(&asoc->stats, 0, sizeof(struct sctp_priv_assoc_stats)); | |
326 | ||
a29a5bd4 VY |
327 | /* AUTH related initializations */ |
328 | INIT_LIST_HEAD(&asoc->endpoint_shared_keys); | |
329 | err = sctp_auth_asoc_copy_shkeys(ep, asoc, gfp); | |
330 | if (err) | |
331 | goto fail_init; | |
332 | ||
333 | asoc->active_key_id = ep->active_key_id; | |
334 | asoc->asoc_shared_key = NULL; | |
335 | ||
336 | asoc->default_hmac_id = 0; | |
337 | /* Save the hmacs and chunks list into this association */ | |
338 | if (ep->auth_hmacs_list) | |
339 | memcpy(asoc->c.auth_hmacs, ep->auth_hmacs_list, | |
340 | ntohs(ep->auth_hmacs_list->param_hdr.length)); | |
341 | if (ep->auth_chunk_list) | |
342 | memcpy(asoc->c.auth_chunks, ep->auth_chunk_list, | |
343 | ntohs(ep->auth_chunk_list->param_hdr.length)); | |
344 | ||
345 | /* Get the AUTH random number for this association */ | |
346 | p = (sctp_paramhdr_t *)asoc->c.auth_random; | |
347 | p->type = SCTP_PARAM_RANDOM; | |
348 | p->length = htons(sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH); | |
349 | get_random_bytes(p+1, SCTP_AUTH_RANDOM_LENGTH); | |
350 | ||
1da177e4 LT |
351 | return asoc; |
352 | ||
353 | fail_init: | |
354 | sctp_endpoint_put(asoc->ep); | |
355 | sock_put(asoc->base.sk); | |
356 | return NULL; | |
357 | } | |
358 | ||
359 | /* Allocate and initialize a new association */ | |
360 | struct sctp_association *sctp_association_new(const struct sctp_endpoint *ep, | |
361 | const struct sock *sk, | |
3182cd84 | 362 | sctp_scope_t scope, |
dd0fc66f | 363 | gfp_t gfp) |
1da177e4 LT |
364 | { |
365 | struct sctp_association *asoc; | |
366 | ||
367 | asoc = t_new(struct sctp_association, gfp); | |
368 | if (!asoc) | |
369 | goto fail; | |
370 | ||
371 | if (!sctp_association_init(asoc, ep, sk, scope, gfp)) | |
372 | goto fail_init; | |
373 | ||
374 | asoc->base.malloced = 1; | |
375 | SCTP_DBG_OBJCNT_INC(assoc); | |
3f7a87d2 | 376 | SCTP_DEBUG_PRINTK("Created asoc %p\n", asoc); |
1da177e4 LT |
377 | |
378 | return asoc; | |
379 | ||
380 | fail_init: | |
381 | kfree(asoc); | |
382 | fail: | |
383 | return NULL; | |
384 | } | |
385 | ||
386 | /* Free this association if possible. There may still be users, so | |
387 | * the actual deallocation may be delayed. | |
388 | */ | |
389 | void sctp_association_free(struct sctp_association *asoc) | |
390 | { | |
391 | struct sock *sk = asoc->base.sk; | |
392 | struct sctp_transport *transport; | |
393 | struct list_head *pos, *temp; | |
394 | int i; | |
395 | ||
de76e695 VY |
396 | /* Only real associations count against the endpoint, so |
397 | * don't bother for if this is a temporary association. | |
398 | */ | |
399 | if (!asoc->temp) { | |
400 | list_del(&asoc->asocs); | |
401 | ||
402 | /* Decrement the backlog value for a TCP-style listening | |
403 | * socket. | |
404 | */ | |
405 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) | |
406 | sk->sk_ack_backlog--; | |
407 | } | |
1da177e4 LT |
408 | |
409 | /* Mark as dead, so other users can know this structure is | |
410 | * going away. | |
411 | */ | |
412 | asoc->base.dead = 1; | |
413 | ||
414 | /* Dispose of any data lying around in the outqueue. */ | |
415 | sctp_outq_free(&asoc->outqueue); | |
416 | ||
417 | /* Dispose of any pending messages for the upper layer. */ | |
418 | sctp_ulpq_free(&asoc->ulpq); | |
419 | ||
420 | /* Dispose of any pending chunks on the inqueue. */ | |
421 | sctp_inq_free(&asoc->base.inqueue); | |
422 | ||
8e1ee18c VY |
423 | sctp_tsnmap_free(&asoc->peer.tsn_map); |
424 | ||
1da177e4 LT |
425 | /* Free ssnmap storage. */ |
426 | sctp_ssnmap_free(asoc->ssnmap); | |
427 | ||
428 | /* Clean up the bound address list. */ | |
429 | sctp_bind_addr_free(&asoc->base.bind_addr); | |
430 | ||
431 | /* Do we need to go through all of our timers and | |
432 | * delete them? To be safe we will try to delete all, but we | |
433 | * should be able to go through and make a guess based | |
434 | * on our state. | |
435 | */ | |
436 | for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) { | |
437 | if (timer_pending(&asoc->timers[i]) && | |
438 | del_timer(&asoc->timers[i])) | |
439 | sctp_association_put(asoc); | |
440 | } | |
441 | ||
442 | /* Free peer's cached cookie. */ | |
a51482bd | 443 | kfree(asoc->peer.cookie); |
730fc3d0 VY |
444 | kfree(asoc->peer.peer_random); |
445 | kfree(asoc->peer.peer_chunks); | |
446 | kfree(asoc->peer.peer_hmacs); | |
1da177e4 LT |
447 | |
448 | /* Release the transport structures. */ | |
449 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
450 | transport = list_entry(pos, struct sctp_transport, transports); | |
45122ca2 | 451 | list_del_rcu(pos); |
1da177e4 LT |
452 | sctp_transport_free(transport); |
453 | } | |
454 | ||
3f7a87d2 FF |
455 | asoc->peer.transport_count = 0; |
456 | ||
a000c01e | 457 | sctp_asconf_queue_teardown(asoc); |
1da177e4 | 458 | |
8a07eb0a MH |
459 | /* Free pending address space being deleted */ |
460 | if (asoc->asconf_addr_del_pending != NULL) | |
461 | kfree(asoc->asconf_addr_del_pending); | |
462 | ||
a29a5bd4 VY |
463 | /* AUTH - Free the endpoint shared keys */ |
464 | sctp_auth_destroy_keys(&asoc->endpoint_shared_keys); | |
465 | ||
466 | /* AUTH - Free the association shared key */ | |
467 | sctp_auth_key_put(asoc->asoc_shared_key); | |
468 | ||
1da177e4 LT |
469 | sctp_association_put(asoc); |
470 | } | |
471 | ||
472 | /* Cleanup and free up an association. */ | |
473 | static void sctp_association_destroy(struct sctp_association *asoc) | |
474 | { | |
475 | SCTP_ASSERT(asoc->base.dead, "Assoc is not dead", return); | |
476 | ||
477 | sctp_endpoint_put(asoc->ep); | |
478 | sock_put(asoc->base.sk); | |
479 | ||
480 | if (asoc->assoc_id != 0) { | |
481 | spin_lock_bh(&sctp_assocs_id_lock); | |
482 | idr_remove(&sctp_assocs_id, asoc->assoc_id); | |
483 | spin_unlock_bh(&sctp_assocs_id_lock); | |
484 | } | |
485 | ||
547b792c | 486 | WARN_ON(atomic_read(&asoc->rmem_alloc)); |
049b3ff5 | 487 | |
1da177e4 LT |
488 | if (asoc->base.malloced) { |
489 | kfree(asoc); | |
490 | SCTP_DBG_OBJCNT_DEC(assoc); | |
491 | } | |
492 | } | |
493 | ||
494 | /* Change the primary destination address for the peer. */ | |
495 | void sctp_assoc_set_primary(struct sctp_association *asoc, | |
496 | struct sctp_transport *transport) | |
497 | { | |
319fa2a2 VY |
498 | int changeover = 0; |
499 | ||
500 | /* it's a changeover only if we already have a primary path | |
501 | * that we are changing | |
502 | */ | |
503 | if (asoc->peer.primary_path != NULL && | |
504 | asoc->peer.primary_path != transport) | |
505 | changeover = 1 ; | |
506 | ||
1da177e4 LT |
507 | asoc->peer.primary_path = transport; |
508 | ||
509 | /* Set a default msg_name for events. */ | |
510 | memcpy(&asoc->peer.primary_addr, &transport->ipaddr, | |
511 | sizeof(union sctp_addr)); | |
512 | ||
513 | /* If the primary path is changing, assume that the | |
514 | * user wants to use this new path. | |
515 | */ | |
ad8fec17 SS |
516 | if ((transport->state == SCTP_ACTIVE) || |
517 | (transport->state == SCTP_UNKNOWN)) | |
1da177e4 LT |
518 | asoc->peer.active_path = transport; |
519 | ||
520 | /* | |
521 | * SFR-CACC algorithm: | |
522 | * Upon the receipt of a request to change the primary | |
523 | * destination address, on the data structure for the new | |
524 | * primary destination, the sender MUST do the following: | |
525 | * | |
526 | * 1) If CHANGEOVER_ACTIVE is set, then there was a switch | |
527 | * to this destination address earlier. The sender MUST set | |
528 | * CYCLING_CHANGEOVER to indicate that this switch is a | |
529 | * double switch to the same destination address. | |
e0e9db17 VY |
530 | * |
531 | * Really, only bother is we have data queued or outstanding on | |
532 | * the association. | |
1da177e4 | 533 | */ |
e0e9db17 VY |
534 | if (!asoc->outqueue.outstanding_bytes && !asoc->outqueue.out_qlen) |
535 | return; | |
536 | ||
1da177e4 | 537 | if (transport->cacc.changeover_active) |
319fa2a2 | 538 | transport->cacc.cycling_changeover = changeover; |
1da177e4 LT |
539 | |
540 | /* 2) The sender MUST set CHANGEOVER_ACTIVE to indicate that | |
541 | * a changeover has occurred. | |
542 | */ | |
319fa2a2 | 543 | transport->cacc.changeover_active = changeover; |
1da177e4 LT |
544 | |
545 | /* 3) The sender MUST store the next TSN to be sent in | |
546 | * next_tsn_at_change. | |
547 | */ | |
548 | transport->cacc.next_tsn_at_change = asoc->next_tsn; | |
549 | } | |
550 | ||
3f7a87d2 FF |
551 | /* Remove a transport from an association. */ |
552 | void sctp_assoc_rm_peer(struct sctp_association *asoc, | |
553 | struct sctp_transport *peer) | |
554 | { | |
555 | struct list_head *pos; | |
556 | struct sctp_transport *transport; | |
557 | ||
558 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_rm_peer:association %p addr: ", | |
559 | " port: %d\n", | |
560 | asoc, | |
561 | (&peer->ipaddr), | |
b3f5b3b6 | 562 | ntohs(peer->ipaddr.v4.sin_port)); |
3f7a87d2 FF |
563 | |
564 | /* If we are to remove the current retran_path, update it | |
565 | * to the next peer before removing this peer from the list. | |
566 | */ | |
567 | if (asoc->peer.retran_path == peer) | |
568 | sctp_assoc_update_retran_path(asoc); | |
569 | ||
570 | /* Remove this peer from the list. */ | |
45122ca2 | 571 | list_del_rcu(&peer->transports); |
3f7a87d2 FF |
572 | |
573 | /* Get the first transport of asoc. */ | |
574 | pos = asoc->peer.transport_addr_list.next; | |
575 | transport = list_entry(pos, struct sctp_transport, transports); | |
576 | ||
577 | /* Update any entries that match the peer to be deleted. */ | |
578 | if (asoc->peer.primary_path == peer) | |
579 | sctp_assoc_set_primary(asoc, transport); | |
580 | if (asoc->peer.active_path == peer) | |
581 | asoc->peer.active_path = transport; | |
9494c7c5 WY |
582 | if (asoc->peer.retran_path == peer) |
583 | asoc->peer.retran_path = transport; | |
3f7a87d2 FF |
584 | if (asoc->peer.last_data_from == peer) |
585 | asoc->peer.last_data_from = transport; | |
586 | ||
587 | /* If we remove the transport an INIT was last sent to, set it to | |
588 | * NULL. Combined with the update of the retran path above, this | |
589 | * will cause the next INIT to be sent to the next available | |
590 | * transport, maintaining the cycle. | |
591 | */ | |
592 | if (asoc->init_last_sent_to == peer) | |
593 | asoc->init_last_sent_to = NULL; | |
594 | ||
6345b199 WY |
595 | /* If we remove the transport an SHUTDOWN was last sent to, set it |
596 | * to NULL. Combined with the update of the retran path above, this | |
597 | * will cause the next SHUTDOWN to be sent to the next available | |
598 | * transport, maintaining the cycle. | |
599 | */ | |
600 | if (asoc->shutdown_last_sent_to == peer) | |
601 | asoc->shutdown_last_sent_to = NULL; | |
602 | ||
10a43cea WY |
603 | /* If we remove the transport an ASCONF was last sent to, set it to |
604 | * NULL. | |
605 | */ | |
606 | if (asoc->addip_last_asconf && | |
607 | asoc->addip_last_asconf->transport == peer) | |
608 | asoc->addip_last_asconf->transport = NULL; | |
609 | ||
31b02e15 VY |
610 | /* If we have something on the transmitted list, we have to |
611 | * save it off. The best place is the active path. | |
612 | */ | |
613 | if (!list_empty(&peer->transmitted)) { | |
614 | struct sctp_transport *active = asoc->peer.active_path; | |
615 | struct sctp_chunk *ch; | |
616 | ||
617 | /* Reset the transport of each chunk on this list */ | |
618 | list_for_each_entry(ch, &peer->transmitted, | |
619 | transmitted_list) { | |
620 | ch->transport = NULL; | |
621 | ch->rtt_in_progress = 0; | |
622 | } | |
623 | ||
624 | list_splice_tail_init(&peer->transmitted, | |
625 | &active->transmitted); | |
626 | ||
627 | /* Start a T3 timer here in case it wasn't running so | |
628 | * that these migrated packets have a chance to get | |
629 | * retrnasmitted. | |
630 | */ | |
631 | if (!timer_pending(&active->T3_rtx_timer)) | |
632 | if (!mod_timer(&active->T3_rtx_timer, | |
633 | jiffies + active->rto)) | |
634 | sctp_transport_hold(active); | |
635 | } | |
636 | ||
3f7a87d2 FF |
637 | asoc->peer.transport_count--; |
638 | ||
639 | sctp_transport_free(peer); | |
640 | } | |
641 | ||
1da177e4 LT |
642 | /* Add a transport address to an association. */ |
643 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, | |
644 | const union sctp_addr *addr, | |
dd0fc66f | 645 | const gfp_t gfp, |
3f7a87d2 | 646 | const int peer_state) |
1da177e4 | 647 | { |
89bf3450 | 648 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
649 | struct sctp_transport *peer; |
650 | struct sctp_sock *sp; | |
651 | unsigned short port; | |
652 | ||
653 | sp = sctp_sk(asoc->base.sk); | |
654 | ||
655 | /* AF_INET and AF_INET6 share common port field. */ | |
4bdf4b5f | 656 | port = ntohs(addr->v4.sin_port); |
1da177e4 | 657 | |
3f7a87d2 | 658 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_add_peer:association %p addr: ", |
ad8fec17 | 659 | " port: %d state:%d\n", |
3f7a87d2 FF |
660 | asoc, |
661 | addr, | |
4bdf4b5f | 662 | port, |
ad8fec17 | 663 | peer_state); |
3f7a87d2 | 664 | |
1da177e4 LT |
665 | /* Set the port if it has not been set yet. */ |
666 | if (0 == asoc->peer.port) | |
667 | asoc->peer.port = port; | |
668 | ||
669 | /* Check to see if this is a duplicate. */ | |
670 | peer = sctp_assoc_lookup_paddr(asoc, addr); | |
3f7a87d2 | 671 | if (peer) { |
add52379 VY |
672 | /* An UNKNOWN state is only set on transports added by |
673 | * user in sctp_connectx() call. Such transports should be | |
674 | * considered CONFIRMED per RFC 4960, Section 5.4. | |
675 | */ | |
ad8fec17 | 676 | if (peer->state == SCTP_UNKNOWN) { |
add52379 | 677 | peer->state = SCTP_ACTIVE; |
ad8fec17 | 678 | } |
1da177e4 | 679 | return peer; |
3f7a87d2 | 680 | } |
1da177e4 | 681 | |
89bf3450 | 682 | peer = sctp_transport_new(net, addr, gfp); |
1da177e4 LT |
683 | if (!peer) |
684 | return NULL; | |
685 | ||
686 | sctp_transport_set_owner(peer, asoc); | |
687 | ||
52ccb8e9 FF |
688 | /* Initialize the peer's heartbeat interval based on the |
689 | * association configured value. | |
690 | */ | |
691 | peer->hbinterval = asoc->hbinterval; | |
692 | ||
693 | /* Set the path max_retrans. */ | |
694 | peer->pathmaxrxt = asoc->pathmaxrxt; | |
695 | ||
5aa93bcf NH |
696 | /* And the partial failure retrnas threshold */ |
697 | peer->pf_retrans = asoc->pf_retrans; | |
698 | ||
52ccb8e9 FF |
699 | /* Initialize the peer's SACK delay timeout based on the |
700 | * association configured value. | |
701 | */ | |
702 | peer->sackdelay = asoc->sackdelay; | |
d364d927 | 703 | peer->sackfreq = asoc->sackfreq; |
52ccb8e9 FF |
704 | |
705 | /* Enable/disable heartbeat, SACK delay, and path MTU discovery | |
706 | * based on association setting. | |
707 | */ | |
708 | peer->param_flags = asoc->param_flags; | |
709 | ||
8da645e1 VY |
710 | sctp_transport_route(peer, NULL, sp); |
711 | ||
1da177e4 | 712 | /* Initialize the pmtu of the transport. */ |
8da645e1 VY |
713 | if (peer->param_flags & SPP_PMTUD_DISABLE) { |
714 | if (asoc->pathmtu) | |
715 | peer->pathmtu = asoc->pathmtu; | |
716 | else | |
717 | peer->pathmtu = SCTP_DEFAULT_MAXSEGMENT; | |
718 | } | |
1da177e4 LT |
719 | |
720 | /* If this is the first transport addr on this association, | |
721 | * initialize the association PMTU to the peer's PMTU. | |
722 | * If not and the current association PMTU is higher than the new | |
723 | * peer's PMTU, reset the association PMTU to the new peer's PMTU. | |
724 | */ | |
52ccb8e9 FF |
725 | if (asoc->pathmtu) |
726 | asoc->pathmtu = min_t(int, peer->pathmtu, asoc->pathmtu); | |
1da177e4 | 727 | else |
52ccb8e9 | 728 | asoc->pathmtu = peer->pathmtu; |
1da177e4 LT |
729 | |
730 | SCTP_DEBUG_PRINTK("sctp_assoc_add_peer:association %p PMTU set to " | |
52ccb8e9 | 731 | "%d\n", asoc, asoc->pathmtu); |
6d0ccbac | 732 | peer->pmtu_pending = 0; |
1da177e4 | 733 | |
f68b2e05 | 734 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); |
1da177e4 LT |
735 | |
736 | /* The asoc->peer.port might not be meaningful yet, but | |
737 | * initialize the packet structure anyway. | |
738 | */ | |
739 | sctp_packet_init(&peer->packet, peer, asoc->base.bind_addr.port, | |
740 | asoc->peer.port); | |
741 | ||
742 | /* 7.2.1 Slow-Start | |
743 | * | |
744 | * o The initial cwnd before DATA transmission or after a sufficiently | |
745 | * long idle period MUST be set to | |
746 | * min(4*MTU, max(2*MTU, 4380 bytes)) | |
747 | * | |
748 | * o The initial value of ssthresh MAY be arbitrarily high | |
749 | * (for example, implementations MAY use the size of the | |
750 | * receiver advertised window). | |
751 | */ | |
52ccb8e9 | 752 | peer->cwnd = min(4*asoc->pathmtu, max_t(__u32, 2*asoc->pathmtu, 4380)); |
1da177e4 LT |
753 | |
754 | /* At this point, we may not have the receiver's advertised window, | |
755 | * so initialize ssthresh to the default value and it will be set | |
756 | * later when we process the INIT. | |
757 | */ | |
758 | peer->ssthresh = SCTP_DEFAULT_MAXWINDOW; | |
759 | ||
760 | peer->partial_bytes_acked = 0; | |
761 | peer->flight_size = 0; | |
46d5a808 | 762 | peer->burst_limited = 0; |
1da177e4 | 763 | |
1da177e4 LT |
764 | /* Set the transport's RTO.initial value */ |
765 | peer->rto = asoc->rto_initial; | |
196d6759 | 766 | sctp_max_rto(asoc, peer); |
1da177e4 | 767 | |
3f7a87d2 FF |
768 | /* Set the peer's active state. */ |
769 | peer->state = peer_state; | |
770 | ||
1da177e4 | 771 | /* Attach the remote transport to our asoc. */ |
45122ca2 | 772 | list_add_tail_rcu(&peer->transports, &asoc->peer.transport_addr_list); |
3f7a87d2 | 773 | asoc->peer.transport_count++; |
1da177e4 LT |
774 | |
775 | /* If we do not yet have a primary path, set one. */ | |
776 | if (!asoc->peer.primary_path) { | |
777 | sctp_assoc_set_primary(asoc, peer); | |
778 | asoc->peer.retran_path = peer; | |
779 | } | |
780 | ||
fbdf501c VY |
781 | if (asoc->peer.active_path == asoc->peer.retran_path && |
782 | peer->state != SCTP_UNCONFIRMED) { | |
1da177e4 | 783 | asoc->peer.retran_path = peer; |
3f7a87d2 | 784 | } |
1da177e4 LT |
785 | |
786 | return peer; | |
787 | } | |
788 | ||
789 | /* Delete a transport address from an association. */ | |
790 | void sctp_assoc_del_peer(struct sctp_association *asoc, | |
791 | const union sctp_addr *addr) | |
792 | { | |
793 | struct list_head *pos; | |
794 | struct list_head *temp; | |
1da177e4 LT |
795 | struct sctp_transport *transport; |
796 | ||
797 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
798 | transport = list_entry(pos, struct sctp_transport, transports); | |
799 | if (sctp_cmp_addr_exact(addr, &transport->ipaddr)) { | |
3f7a87d2 FF |
800 | /* Do book keeping for removing the peer and free it. */ |
801 | sctp_assoc_rm_peer(asoc, transport); | |
1da177e4 LT |
802 | break; |
803 | } | |
804 | } | |
1da177e4 LT |
805 | } |
806 | ||
807 | /* Lookup a transport by address. */ | |
808 | struct sctp_transport *sctp_assoc_lookup_paddr( | |
809 | const struct sctp_association *asoc, | |
810 | const union sctp_addr *address) | |
811 | { | |
812 | struct sctp_transport *t; | |
1da177e4 LT |
813 | |
814 | /* Cycle through all transports searching for a peer address. */ | |
815 | ||
9dbc15f0 RD |
816 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
817 | transports) { | |
1da177e4 LT |
818 | if (sctp_cmp_addr_exact(address, &t->ipaddr)) |
819 | return t; | |
820 | } | |
821 | ||
822 | return NULL; | |
823 | } | |
824 | ||
42e30bf3 VY |
825 | /* Remove all transports except a give one */ |
826 | void sctp_assoc_del_nonprimary_peers(struct sctp_association *asoc, | |
827 | struct sctp_transport *primary) | |
828 | { | |
829 | struct sctp_transport *temp; | |
830 | struct sctp_transport *t; | |
831 | ||
832 | list_for_each_entry_safe(t, temp, &asoc->peer.transport_addr_list, | |
833 | transports) { | |
834 | /* if the current transport is not the primary one, delete it */ | |
835 | if (t != primary) | |
836 | sctp_assoc_rm_peer(asoc, t); | |
837 | } | |
42e30bf3 VY |
838 | } |
839 | ||
1da177e4 LT |
840 | /* Engage in transport control operations. |
841 | * Mark the transport up or down and send a notification to the user. | |
842 | * Select and update the new active and retran paths. | |
843 | */ | |
844 | void sctp_assoc_control_transport(struct sctp_association *asoc, | |
845 | struct sctp_transport *transport, | |
846 | sctp_transport_cmd_t command, | |
847 | sctp_sn_error_t error) | |
848 | { | |
849 | struct sctp_transport *t = NULL; | |
850 | struct sctp_transport *first; | |
851 | struct sctp_transport *second; | |
852 | struct sctp_ulpevent *event; | |
0906e20f | 853 | struct sockaddr_storage addr; |
1da177e4 | 854 | int spc_state = 0; |
5aa93bcf | 855 | bool ulp_notify = true; |
1da177e4 LT |
856 | |
857 | /* Record the transition on the transport. */ | |
858 | switch (command) { | |
859 | case SCTP_TRANSPORT_UP: | |
1ae4114d VY |
860 | /* If we are moving from UNCONFIRMED state due |
861 | * to heartbeat success, report the SCTP_ADDR_CONFIRMED | |
862 | * state to the user, otherwise report SCTP_ADDR_AVAILABLE. | |
863 | */ | |
864 | if (SCTP_UNCONFIRMED == transport->state && | |
865 | SCTP_HEARTBEAT_SUCCESS == error) | |
866 | spc_state = SCTP_ADDR_CONFIRMED; | |
867 | else | |
868 | spc_state = SCTP_ADDR_AVAILABLE; | |
5aa93bcf NH |
869 | /* Don't inform ULP about transition from PF to |
870 | * active state and set cwnd to 1, see SCTP | |
871 | * Quick failover draft section 5.1, point 5 | |
872 | */ | |
873 | if (transport->state == SCTP_PF) { | |
874 | ulp_notify = false; | |
875 | transport->cwnd = 1; | |
876 | } | |
3f7a87d2 | 877 | transport->state = SCTP_ACTIVE; |
1da177e4 LT |
878 | break; |
879 | ||
880 | case SCTP_TRANSPORT_DOWN: | |
40187886 VY |
881 | /* If the transport was never confirmed, do not transition it |
882 | * to inactive state. Also, release the cached route since | |
883 | * there may be a better route next time. | |
cc75689a VY |
884 | */ |
885 | if (transport->state != SCTP_UNCONFIRMED) | |
886 | transport->state = SCTP_INACTIVE; | |
40187886 VY |
887 | else { |
888 | dst_release(transport->dst); | |
889 | transport->dst = NULL; | |
890 | } | |
cc75689a | 891 | |
1da177e4 LT |
892 | spc_state = SCTP_ADDR_UNREACHABLE; |
893 | break; | |
894 | ||
5aa93bcf NH |
895 | case SCTP_TRANSPORT_PF: |
896 | transport->state = SCTP_PF; | |
897 | ulp_notify = false; | |
898 | break; | |
899 | ||
1da177e4 LT |
900 | default: |
901 | return; | |
3ff50b79 | 902 | } |
1da177e4 LT |
903 | |
904 | /* Generate and send a SCTP_PEER_ADDR_CHANGE notification to the | |
905 | * user. | |
906 | */ | |
5aa93bcf NH |
907 | if (ulp_notify) { |
908 | memset(&addr, 0, sizeof(struct sockaddr_storage)); | |
909 | memcpy(&addr, &transport->ipaddr, | |
910 | transport->af_specific->sockaddr_len); | |
911 | event = sctp_ulpevent_make_peer_addr_change(asoc, &addr, | |
912 | 0, spc_state, error, GFP_ATOMIC); | |
913 | if (event) | |
914 | sctp_ulpq_tail_event(&asoc->ulpq, event); | |
915 | } | |
1da177e4 LT |
916 | |
917 | /* Select new active and retran paths. */ | |
918 | ||
919 | /* Look for the two most recently used active transports. | |
920 | * | |
921 | * This code produces the wrong ordering whenever jiffies | |
922 | * rolls over, but we still get usable transports, so we don't | |
923 | * worry about it. | |
924 | */ | |
925 | first = NULL; second = NULL; | |
926 | ||
9dbc15f0 RD |
927 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
928 | transports) { | |
1da177e4 | 929 | |
ad8fec17 | 930 | if ((t->state == SCTP_INACTIVE) || |
5aa93bcf NH |
931 | (t->state == SCTP_UNCONFIRMED) || |
932 | (t->state == SCTP_PF)) | |
1da177e4 LT |
933 | continue; |
934 | if (!first || t->last_time_heard > first->last_time_heard) { | |
935 | second = first; | |
936 | first = t; | |
937 | } | |
938 | if (!second || t->last_time_heard > second->last_time_heard) | |
939 | second = t; | |
940 | } | |
941 | ||
942 | /* RFC 2960 6.4 Multi-Homed SCTP Endpoints | |
943 | * | |
944 | * By default, an endpoint should always transmit to the | |
945 | * primary path, unless the SCTP user explicitly specifies the | |
946 | * destination transport address (and possibly source | |
947 | * transport address) to use. | |
948 | * | |
949 | * [If the primary is active but not most recent, bump the most | |
950 | * recently used transport.] | |
951 | */ | |
ad8fec17 SS |
952 | if (((asoc->peer.primary_path->state == SCTP_ACTIVE) || |
953 | (asoc->peer.primary_path->state == SCTP_UNKNOWN)) && | |
1da177e4 LT |
954 | first != asoc->peer.primary_path) { |
955 | second = first; | |
956 | first = asoc->peer.primary_path; | |
957 | } | |
958 | ||
959 | /* If we failed to find a usable transport, just camp on the | |
960 | * primary, even if it is inactive. | |
961 | */ | |
962 | if (!first) { | |
963 | first = asoc->peer.primary_path; | |
964 | second = asoc->peer.primary_path; | |
965 | } | |
966 | ||
967 | /* Set the active and retran transports. */ | |
968 | asoc->peer.active_path = first; | |
969 | asoc->peer.retran_path = second; | |
970 | } | |
971 | ||
972 | /* Hold a reference to an association. */ | |
973 | void sctp_association_hold(struct sctp_association *asoc) | |
974 | { | |
975 | atomic_inc(&asoc->base.refcnt); | |
976 | } | |
977 | ||
978 | /* Release a reference to an association and cleanup | |
979 | * if there are no more references. | |
980 | */ | |
981 | void sctp_association_put(struct sctp_association *asoc) | |
982 | { | |
983 | if (atomic_dec_and_test(&asoc->base.refcnt)) | |
984 | sctp_association_destroy(asoc); | |
985 | } | |
986 | ||
987 | /* Allocate the next TSN, Transmission Sequence Number, for the given | |
988 | * association. | |
989 | */ | |
990 | __u32 sctp_association_get_next_tsn(struct sctp_association *asoc) | |
991 | { | |
992 | /* From Section 1.6 Serial Number Arithmetic: | |
993 | * Transmission Sequence Numbers wrap around when they reach | |
994 | * 2**32 - 1. That is, the next TSN a DATA chunk MUST use | |
995 | * after transmitting TSN = 2*32 - 1 is TSN = 0. | |
996 | */ | |
997 | __u32 retval = asoc->next_tsn; | |
998 | asoc->next_tsn++; | |
999 | asoc->unack_data++; | |
1000 | ||
1001 | return retval; | |
1002 | } | |
1003 | ||
1004 | /* Compare two addresses to see if they match. Wildcard addresses | |
1005 | * only match themselves. | |
1006 | */ | |
1007 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, | |
1008 | const union sctp_addr *ss2) | |
1009 | { | |
1010 | struct sctp_af *af; | |
1011 | ||
1012 | af = sctp_get_af_specific(ss1->sa.sa_family); | |
1013 | if (unlikely(!af)) | |
1014 | return 0; | |
1015 | ||
1016 | return af->cmp_addr(ss1, ss2); | |
1017 | } | |
1018 | ||
1019 | /* Return an ecne chunk to get prepended to a packet. | |
1020 | * Note: We are sly and return a shared, prealloced chunk. FIXME: | |
1021 | * No we don't, but we could/should. | |
1022 | */ | |
1023 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc) | |
1024 | { | |
1025 | struct sctp_chunk *chunk; | |
1026 | ||
1027 | /* Send ECNE if needed. | |
1028 | * Not being able to allocate a chunk here is not deadly. | |
1029 | */ | |
1030 | if (asoc->need_ecne) | |
1031 | chunk = sctp_make_ecne(asoc, asoc->last_ecne_tsn); | |
1032 | else | |
1033 | chunk = NULL; | |
1034 | ||
1035 | return chunk; | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Find which transport this TSN was sent on. | |
1040 | */ | |
1041 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *asoc, | |
1042 | __u32 tsn) | |
1043 | { | |
1044 | struct sctp_transport *active; | |
1045 | struct sctp_transport *match; | |
1da177e4 LT |
1046 | struct sctp_transport *transport; |
1047 | struct sctp_chunk *chunk; | |
dbc16db1 | 1048 | __be32 key = htonl(tsn); |
1da177e4 LT |
1049 | |
1050 | match = NULL; | |
1051 | ||
1052 | /* | |
1053 | * FIXME: In general, find a more efficient data structure for | |
1054 | * searching. | |
1055 | */ | |
1056 | ||
1057 | /* | |
1058 | * The general strategy is to search each transport's transmitted | |
1059 | * list. Return which transport this TSN lives on. | |
1060 | * | |
1061 | * Let's be hopeful and check the active_path first. | |
1062 | * Another optimization would be to know if there is only one | |
1063 | * outbound path and not have to look for the TSN at all. | |
1064 | * | |
1065 | */ | |
1066 | ||
1067 | active = asoc->peer.active_path; | |
1068 | ||
9dbc15f0 RD |
1069 | list_for_each_entry(chunk, &active->transmitted, |
1070 | transmitted_list) { | |
1da177e4 LT |
1071 | |
1072 | if (key == chunk->subh.data_hdr->tsn) { | |
1073 | match = active; | |
1074 | goto out; | |
1075 | } | |
1076 | } | |
1077 | ||
1078 | /* If not found, go search all the other transports. */ | |
9dbc15f0 RD |
1079 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
1080 | transports) { | |
1da177e4 LT |
1081 | |
1082 | if (transport == active) | |
1083 | break; | |
9dbc15f0 RD |
1084 | list_for_each_entry(chunk, &transport->transmitted, |
1085 | transmitted_list) { | |
1da177e4 LT |
1086 | if (key == chunk->subh.data_hdr->tsn) { |
1087 | match = transport; | |
1088 | goto out; | |
1089 | } | |
1090 | } | |
1091 | } | |
1092 | out: | |
1093 | return match; | |
1094 | } | |
1095 | ||
1096 | /* Is this the association we are looking for? */ | |
1097 | struct sctp_transport *sctp_assoc_is_match(struct sctp_association *asoc, | |
4110cc25 | 1098 | struct net *net, |
1da177e4 LT |
1099 | const union sctp_addr *laddr, |
1100 | const union sctp_addr *paddr) | |
1101 | { | |
1102 | struct sctp_transport *transport; | |
1103 | ||
e2fccedb | 1104 | if ((htons(asoc->base.bind_addr.port) == laddr->v4.sin_port) && |
4110cc25 EB |
1105 | (htons(asoc->peer.port) == paddr->v4.sin_port) && |
1106 | net_eq(sock_net(asoc->base.sk), net)) { | |
1da177e4 LT |
1107 | transport = sctp_assoc_lookup_paddr(asoc, paddr); |
1108 | if (!transport) | |
1109 | goto out; | |
1110 | ||
1111 | if (sctp_bind_addr_match(&asoc->base.bind_addr, laddr, | |
1112 | sctp_sk(asoc->base.sk))) | |
1113 | goto out; | |
1114 | } | |
1115 | transport = NULL; | |
1116 | ||
1117 | out: | |
1da177e4 LT |
1118 | return transport; |
1119 | } | |
1120 | ||
1121 | /* Do delayed input processing. This is scheduled by sctp_rcv(). */ | |
c4028958 | 1122 | static void sctp_assoc_bh_rcv(struct work_struct *work) |
1da177e4 | 1123 | { |
c4028958 DH |
1124 | struct sctp_association *asoc = |
1125 | container_of(work, struct sctp_association, | |
1126 | base.inqueue.immediate); | |
55e26eb9 | 1127 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
1128 | struct sctp_endpoint *ep; |
1129 | struct sctp_chunk *chunk; | |
1da177e4 LT |
1130 | struct sctp_inq *inqueue; |
1131 | int state; | |
1132 | sctp_subtype_t subtype; | |
1133 | int error = 0; | |
1134 | ||
1135 | /* The association should be held so we should be safe. */ | |
1136 | ep = asoc->ep; | |
1da177e4 LT |
1137 | |
1138 | inqueue = &asoc->base.inqueue; | |
1139 | sctp_association_hold(asoc); | |
1140 | while (NULL != (chunk = sctp_inq_pop(inqueue))) { | |
1141 | state = asoc->state; | |
1142 | subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type); | |
1143 | ||
bbd0d598 VY |
1144 | /* SCTP-AUTH, Section 6.3: |
1145 | * The receiver has a list of chunk types which it expects | |
1146 | * to be received only after an AUTH-chunk. This list has | |
1147 | * been sent to the peer during the association setup. It | |
1148 | * MUST silently discard these chunks if they are not placed | |
1149 | * after an AUTH chunk in the packet. | |
1150 | */ | |
1151 | if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth) | |
1152 | continue; | |
1153 | ||
1da177e4 LT |
1154 | /* Remember where the last DATA chunk came from so we |
1155 | * know where to send the SACK. | |
1156 | */ | |
1157 | if (sctp_chunk_is_data(chunk)) | |
1158 | asoc->peer.last_data_from = chunk->transport; | |
196d6759 | 1159 | else { |
55e26eb9 | 1160 | SCTP_INC_STATS(net, SCTP_MIB_INCTRLCHUNKS); |
196d6759 MB |
1161 | asoc->stats.ictrlchunks++; |
1162 | if (chunk->chunk_hdr->type == SCTP_CID_SACK) | |
1163 | asoc->stats.isacks++; | |
1164 | } | |
1da177e4 LT |
1165 | |
1166 | if (chunk->transport) | |
1167 | chunk->transport->last_time_heard = jiffies; | |
1168 | ||
1169 | /* Run through the state machine. */ | |
55e26eb9 | 1170 | error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, |
1da177e4 LT |
1171 | state, ep, asoc, chunk, GFP_ATOMIC); |
1172 | ||
1173 | /* Check to see if the association is freed in response to | |
1174 | * the incoming chunk. If so, get out of the while loop. | |
1175 | */ | |
1176 | if (asoc->base.dead) | |
1177 | break; | |
1178 | ||
1179 | /* If there is an error on chunk, discard this packet. */ | |
1180 | if (error && chunk) | |
1181 | chunk->pdiscard = 1; | |
1182 | } | |
1183 | sctp_association_put(asoc); | |
1184 | } | |
1185 | ||
1186 | /* This routine moves an association from its old sk to a new sk. */ | |
1187 | void sctp_assoc_migrate(struct sctp_association *assoc, struct sock *newsk) | |
1188 | { | |
1189 | struct sctp_sock *newsp = sctp_sk(newsk); | |
1190 | struct sock *oldsk = assoc->base.sk; | |
1191 | ||
1192 | /* Delete the association from the old endpoint's list of | |
1193 | * associations. | |
1194 | */ | |
1195 | list_del_init(&assoc->asocs); | |
1196 | ||
1197 | /* Decrement the backlog value for a TCP-style socket. */ | |
1198 | if (sctp_style(oldsk, TCP)) | |
1199 | oldsk->sk_ack_backlog--; | |
1200 | ||
1201 | /* Release references to the old endpoint and the sock. */ | |
1202 | sctp_endpoint_put(assoc->ep); | |
1203 | sock_put(assoc->base.sk); | |
1204 | ||
1205 | /* Get a reference to the new endpoint. */ | |
1206 | assoc->ep = newsp->ep; | |
1207 | sctp_endpoint_hold(assoc->ep); | |
1208 | ||
1209 | /* Get a reference to the new sock. */ | |
1210 | assoc->base.sk = newsk; | |
1211 | sock_hold(assoc->base.sk); | |
1212 | ||
1213 | /* Add the association to the new endpoint's list of associations. */ | |
1214 | sctp_endpoint_add_asoc(newsp->ep, assoc); | |
1215 | } | |
1216 | ||
1217 | /* Update an association (possibly from unexpected COOKIE-ECHO processing). */ | |
1218 | void sctp_assoc_update(struct sctp_association *asoc, | |
1219 | struct sctp_association *new) | |
1220 | { | |
1221 | struct sctp_transport *trans; | |
1222 | struct list_head *pos, *temp; | |
1223 | ||
1224 | /* Copy in new parameters of peer. */ | |
1225 | asoc->c = new->c; | |
1226 | asoc->peer.rwnd = new->peer.rwnd; | |
1227 | asoc->peer.sack_needed = new->peer.sack_needed; | |
1228 | asoc->peer.i = new->peer.i; | |
8e1ee18c VY |
1229 | sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
1230 | asoc->peer.i.initial_tsn, GFP_ATOMIC); | |
1da177e4 LT |
1231 | |
1232 | /* Remove any peer addresses not present in the new association. */ | |
1233 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
1234 | trans = list_entry(pos, struct sctp_transport, transports); | |
0c42749c VY |
1235 | if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr)) { |
1236 | sctp_assoc_rm_peer(asoc, trans); | |
1237 | continue; | |
1238 | } | |
749bf921 VY |
1239 | |
1240 | if (asoc->state >= SCTP_STATE_ESTABLISHED) | |
1241 | sctp_transport_reset(trans); | |
1da177e4 LT |
1242 | } |
1243 | ||
1244 | /* If the case is A (association restart), use | |
1245 | * initial_tsn as next_tsn. If the case is B, use | |
1246 | * current next_tsn in case data sent to peer | |
1247 | * has been discarded and needs retransmission. | |
1248 | */ | |
1249 | if (asoc->state >= SCTP_STATE_ESTABLISHED) { | |
1250 | asoc->next_tsn = new->next_tsn; | |
1251 | asoc->ctsn_ack_point = new->ctsn_ack_point; | |
1252 | asoc->adv_peer_ack_point = new->adv_peer_ack_point; | |
1253 | ||
1254 | /* Reinitialize SSN for both local streams | |
1255 | * and peer's streams. | |
1256 | */ | |
1257 | sctp_ssnmap_clear(asoc->ssnmap); | |
1258 | ||
0b58a811 VY |
1259 | /* Flush the ULP reassembly and ordered queue. |
1260 | * Any data there will now be stale and will | |
1261 | * cause problems. | |
1262 | */ | |
1263 | sctp_ulpq_flush(&asoc->ulpq); | |
1264 | ||
749bf921 VY |
1265 | /* reset the overall association error count so |
1266 | * that the restarted association doesn't get torn | |
1267 | * down on the next retransmission timer. | |
1268 | */ | |
1269 | asoc->overall_error_count = 0; | |
1270 | ||
1da177e4 LT |
1271 | } else { |
1272 | /* Add any peer addresses from the new association. */ | |
9dbc15f0 RD |
1273 | list_for_each_entry(trans, &new->peer.transport_addr_list, |
1274 | transports) { | |
1da177e4 LT |
1275 | if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr)) |
1276 | sctp_assoc_add_peer(asoc, &trans->ipaddr, | |
ad8fec17 | 1277 | GFP_ATOMIC, trans->state); |
1da177e4 LT |
1278 | } |
1279 | ||
1280 | asoc->ctsn_ack_point = asoc->next_tsn - 1; | |
1281 | asoc->adv_peer_ack_point = asoc->ctsn_ack_point; | |
1282 | if (!asoc->ssnmap) { | |
1283 | /* Move the ssnmap. */ | |
1284 | asoc->ssnmap = new->ssnmap; | |
1285 | new->ssnmap = NULL; | |
1286 | } | |
07d93967 VY |
1287 | |
1288 | if (!asoc->assoc_id) { | |
1289 | /* get a new association id since we don't have one | |
1290 | * yet. | |
1291 | */ | |
1292 | sctp_assoc_set_id(asoc, GFP_ATOMIC); | |
1293 | } | |
1da177e4 | 1294 | } |
a29a5bd4 | 1295 | |
730fc3d0 VY |
1296 | /* SCTP-AUTH: Save the peer parameters from the new assocaitions |
1297 | * and also move the association shared keys over | |
1298 | */ | |
1299 | kfree(asoc->peer.peer_random); | |
1300 | asoc->peer.peer_random = new->peer.peer_random; | |
1301 | new->peer.peer_random = NULL; | |
1302 | ||
1303 | kfree(asoc->peer.peer_chunks); | |
1304 | asoc->peer.peer_chunks = new->peer.peer_chunks; | |
1305 | new->peer.peer_chunks = NULL; | |
1306 | ||
1307 | kfree(asoc->peer.peer_hmacs); | |
1308 | asoc->peer.peer_hmacs = new->peer.peer_hmacs; | |
1309 | new->peer.peer_hmacs = NULL; | |
1310 | ||
1311 | sctp_auth_key_put(asoc->asoc_shared_key); | |
1312 | sctp_auth_asoc_init_active_key(asoc, GFP_ATOMIC); | |
1da177e4 LT |
1313 | } |
1314 | ||
1315 | /* Update the retran path for sending a retransmitted packet. | |
1316 | * Round-robin through the active transports, else round-robin | |
1317 | * through the inactive transports as this is the next best thing | |
1318 | * we can try. | |
1319 | */ | |
1320 | void sctp_assoc_update_retran_path(struct sctp_association *asoc) | |
1321 | { | |
1322 | struct sctp_transport *t, *next; | |
1323 | struct list_head *head = &asoc->peer.transport_addr_list; | |
1324 | struct list_head *pos; | |
1325 | ||
4141ddc0 GJ |
1326 | if (asoc->peer.transport_count == 1) |
1327 | return; | |
1328 | ||
1da177e4 LT |
1329 | /* Find the next transport in a round-robin fashion. */ |
1330 | t = asoc->peer.retran_path; | |
1331 | pos = &t->transports; | |
1332 | next = NULL; | |
1333 | ||
1334 | while (1) { | |
1335 | /* Skip the head. */ | |
1336 | if (pos->next == head) | |
1337 | pos = head->next; | |
1338 | else | |
1339 | pos = pos->next; | |
1340 | ||
1341 | t = list_entry(pos, struct sctp_transport, transports); | |
1342 | ||
4141ddc0 GJ |
1343 | /* We have exhausted the list, but didn't find any |
1344 | * other active transports. If so, use the next | |
1345 | * transport. | |
1346 | */ | |
1347 | if (t == asoc->peer.retran_path) { | |
1348 | t = next; | |
1349 | break; | |
1350 | } | |
1351 | ||
1da177e4 LT |
1352 | /* Try to find an active transport. */ |
1353 | ||
ad8fec17 SS |
1354 | if ((t->state == SCTP_ACTIVE) || |
1355 | (t->state == SCTP_UNKNOWN)) { | |
1da177e4 LT |
1356 | break; |
1357 | } else { | |
1358 | /* Keep track of the next transport in case | |
1359 | * we don't find any active transport. | |
1360 | */ | |
fbdf501c | 1361 | if (t->state != SCTP_UNCONFIRMED && !next) |
1da177e4 LT |
1362 | next = t; |
1363 | } | |
1da177e4 LT |
1364 | } |
1365 | ||
d598b166 VY |
1366 | if (t) |
1367 | asoc->peer.retran_path = t; | |
25f7bf7d VY |
1368 | else |
1369 | t = asoc->peer.retran_path; | |
3f7a87d2 FF |
1370 | |
1371 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association" | |
1372 | " %p addr: ", | |
1373 | " port: %d\n", | |
1374 | asoc, | |
1375 | (&t->ipaddr), | |
b3f5b3b6 | 1376 | ntohs(t->ipaddr.v4.sin_port)); |
3f7a87d2 FF |
1377 | } |
1378 | ||
9919b455 WY |
1379 | /* Choose the transport for sending retransmit packet. */ |
1380 | struct sctp_transport *sctp_assoc_choose_alter_transport( | |
1381 | struct sctp_association *asoc, struct sctp_transport *last_sent_to) | |
3f7a87d2 | 1382 | { |
9919b455 WY |
1383 | /* If this is the first time packet is sent, use the active path, |
1384 | * else use the retran path. If the last packet was sent over the | |
3f7a87d2 FF |
1385 | * retran path, update the retran path and use it. |
1386 | */ | |
9919b455 | 1387 | if (!last_sent_to) |
1da177e4 LT |
1388 | return asoc->peer.active_path; |
1389 | else { | |
9919b455 | 1390 | if (last_sent_to == asoc->peer.retran_path) |
1da177e4 LT |
1391 | sctp_assoc_update_retran_path(asoc); |
1392 | return asoc->peer.retran_path; | |
1393 | } | |
1da177e4 LT |
1394 | } |
1395 | ||
1396 | /* Update the association's pmtu and frag_point by going through all the | |
1397 | * transports. This routine is called when a transport's PMTU has changed. | |
1398 | */ | |
02f3d4ce | 1399 | void sctp_assoc_sync_pmtu(struct sock *sk, struct sctp_association *asoc) |
1da177e4 LT |
1400 | { |
1401 | struct sctp_transport *t; | |
1da177e4 LT |
1402 | __u32 pmtu = 0; |
1403 | ||
1404 | if (!asoc) | |
1405 | return; | |
1406 | ||
1407 | /* Get the lowest pmtu of all the transports. */ | |
9dbc15f0 RD |
1408 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1409 | transports) { | |
8a479491 | 1410 | if (t->pmtu_pending && t->dst) { |
02f3d4ce | 1411 | sctp_transport_update_pmtu(sk, t, dst_mtu(t->dst)); |
8a479491 VY |
1412 | t->pmtu_pending = 0; |
1413 | } | |
52ccb8e9 FF |
1414 | if (!pmtu || (t->pathmtu < pmtu)) |
1415 | pmtu = t->pathmtu; | |
1da177e4 LT |
1416 | } |
1417 | ||
1418 | if (pmtu) { | |
52ccb8e9 | 1419 | asoc->pathmtu = pmtu; |
f68b2e05 | 1420 | asoc->frag_point = sctp_frag_point(asoc, pmtu); |
1da177e4 LT |
1421 | } |
1422 | ||
1423 | SCTP_DEBUG_PRINTK("%s: asoc:%p, pmtu:%d, frag_point:%d\n", | |
0dc47877 | 1424 | __func__, asoc, asoc->pathmtu, asoc->frag_point); |
1da177e4 LT |
1425 | } |
1426 | ||
1427 | /* Should we send a SACK to update our peer? */ | |
1428 | static inline int sctp_peer_needs_update(struct sctp_association *asoc) | |
1429 | { | |
e1fc3b14 | 1430 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
1431 | switch (asoc->state) { |
1432 | case SCTP_STATE_ESTABLISHED: | |
1433 | case SCTP_STATE_SHUTDOWN_PENDING: | |
1434 | case SCTP_STATE_SHUTDOWN_RECEIVED: | |
1435 | case SCTP_STATE_SHUTDOWN_SENT: | |
1436 | if ((asoc->rwnd > asoc->a_rwnd) && | |
90f2f531 | 1437 | ((asoc->rwnd - asoc->a_rwnd) >= max_t(__u32, |
e1fc3b14 | 1438 | (asoc->base.sk->sk_rcvbuf >> net->sctp.rwnd_upd_shift), |
90f2f531 | 1439 | asoc->pathmtu))) |
1da177e4 LT |
1440 | return 1; |
1441 | break; | |
1442 | default: | |
1443 | break; | |
1444 | } | |
1445 | return 0; | |
1446 | } | |
1447 | ||
1448 | /* Increase asoc's rwnd by len and send any window update SACK if needed. */ | |
95c96174 | 1449 | void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned int len) |
1da177e4 LT |
1450 | { |
1451 | struct sctp_chunk *sack; | |
1452 | struct timer_list *timer; | |
1453 | ||
1454 | if (asoc->rwnd_over) { | |
1455 | if (asoc->rwnd_over >= len) { | |
1456 | asoc->rwnd_over -= len; | |
1457 | } else { | |
1458 | asoc->rwnd += (len - asoc->rwnd_over); | |
1459 | asoc->rwnd_over = 0; | |
1460 | } | |
1461 | } else { | |
1462 | asoc->rwnd += len; | |
1463 | } | |
1464 | ||
4d3c46e6 VY |
1465 | /* If we had window pressure, start recovering it |
1466 | * once our rwnd had reached the accumulated pressure | |
1467 | * threshold. The idea is to recover slowly, but up | |
1468 | * to the initial advertised window. | |
1469 | */ | |
1470 | if (asoc->rwnd_press && asoc->rwnd >= asoc->rwnd_press) { | |
1471 | int change = min(asoc->pathmtu, asoc->rwnd_press); | |
1472 | asoc->rwnd += change; | |
1473 | asoc->rwnd_press -= change; | |
1474 | } | |
1475 | ||
1da177e4 | 1476 | SCTP_DEBUG_PRINTK("%s: asoc %p rwnd increased by %d to (%u, %u) " |
0dc47877 | 1477 | "- %u\n", __func__, asoc, len, asoc->rwnd, |
1da177e4 LT |
1478 | asoc->rwnd_over, asoc->a_rwnd); |
1479 | ||
1480 | /* Send a window update SACK if the rwnd has increased by at least the | |
1481 | * minimum of the association's PMTU and half of the receive buffer. | |
1482 | * The algorithm used is similar to the one described in | |
1483 | * Section 4.2.3.3 of RFC 1122. | |
1484 | */ | |
1485 | if (sctp_peer_needs_update(asoc)) { | |
1486 | asoc->a_rwnd = asoc->rwnd; | |
1487 | SCTP_DEBUG_PRINTK("%s: Sending window update SACK- asoc: %p " | |
0dc47877 | 1488 | "rwnd: %u a_rwnd: %u\n", __func__, |
1da177e4 LT |
1489 | asoc, asoc->rwnd, asoc->a_rwnd); |
1490 | sack = sctp_make_sack(asoc); | |
1491 | if (!sack) | |
1492 | return; | |
1493 | ||
1494 | asoc->peer.sack_needed = 0; | |
1495 | ||
1496 | sctp_outq_tail(&asoc->outqueue, sack); | |
1497 | ||
1498 | /* Stop the SACK timer. */ | |
1499 | timer = &asoc->timers[SCTP_EVENT_TIMEOUT_SACK]; | |
1500 | if (timer_pending(timer) && del_timer(timer)) | |
1501 | sctp_association_put(asoc); | |
1502 | } | |
1503 | } | |
1504 | ||
1505 | /* Decrease asoc's rwnd by len. */ | |
95c96174 | 1506 | void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned int len) |
1da177e4 | 1507 | { |
4d3c46e6 VY |
1508 | int rx_count; |
1509 | int over = 0; | |
1510 | ||
1da177e4 LT |
1511 | SCTP_ASSERT(asoc->rwnd, "rwnd zero", return); |
1512 | SCTP_ASSERT(!asoc->rwnd_over, "rwnd_over not zero", return); | |
4d3c46e6 VY |
1513 | |
1514 | if (asoc->ep->rcvbuf_policy) | |
1515 | rx_count = atomic_read(&asoc->rmem_alloc); | |
1516 | else | |
1517 | rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc); | |
1518 | ||
1519 | /* If we've reached or overflowed our receive buffer, announce | |
1520 | * a 0 rwnd if rwnd would still be positive. Store the | |
1521 | * the pottential pressure overflow so that the window can be restored | |
1522 | * back to original value. | |
1523 | */ | |
1524 | if (rx_count >= asoc->base.sk->sk_rcvbuf) | |
1525 | over = 1; | |
1526 | ||
1da177e4 LT |
1527 | if (asoc->rwnd >= len) { |
1528 | asoc->rwnd -= len; | |
4d3c46e6 | 1529 | if (over) { |
65883371 | 1530 | asoc->rwnd_press += asoc->rwnd; |
4d3c46e6 VY |
1531 | asoc->rwnd = 0; |
1532 | } | |
1da177e4 LT |
1533 | } else { |
1534 | asoc->rwnd_over = len - asoc->rwnd; | |
1535 | asoc->rwnd = 0; | |
1536 | } | |
4d3c46e6 | 1537 | SCTP_DEBUG_PRINTK("%s: asoc %p rwnd decreased by %d to (%u, %u, %u)\n", |
0dc47877 | 1538 | __func__, asoc, len, asoc->rwnd, |
4d3c46e6 | 1539 | asoc->rwnd_over, asoc->rwnd_press); |
1da177e4 LT |
1540 | } |
1541 | ||
1542 | /* Build the bind address list for the association based on info from the | |
1543 | * local endpoint and the remote peer. | |
1544 | */ | |
3182cd84 | 1545 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, |
409b95af | 1546 | sctp_scope_t scope, gfp_t gfp) |
1da177e4 | 1547 | { |
1da177e4 LT |
1548 | int flags; |
1549 | ||
1550 | /* Use scoping rules to determine the subset of addresses from | |
1551 | * the endpoint. | |
1552 | */ | |
1da177e4 LT |
1553 | flags = (PF_INET6 == asoc->base.sk->sk_family) ? SCTP_ADDR6_ALLOWED : 0; |
1554 | if (asoc->peer.ipv4_address) | |
1555 | flags |= SCTP_ADDR4_PEERSUPP; | |
1556 | if (asoc->peer.ipv6_address) | |
1557 | flags |= SCTP_ADDR6_PEERSUPP; | |
1558 | ||
4db67e80 EB |
1559 | return sctp_bind_addr_copy(sock_net(asoc->base.sk), |
1560 | &asoc->base.bind_addr, | |
1da177e4 LT |
1561 | &asoc->ep->base.bind_addr, |
1562 | scope, gfp, flags); | |
1563 | } | |
1564 | ||
1565 | /* Build the association's bind address list from the cookie. */ | |
1566 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *asoc, | |
3182cd84 | 1567 | struct sctp_cookie *cookie, |
dd0fc66f | 1568 | gfp_t gfp) |
1da177e4 LT |
1569 | { |
1570 | int var_size2 = ntohs(cookie->peer_init->chunk_hdr.length); | |
1571 | int var_size3 = cookie->raw_addr_list_len; | |
1572 | __u8 *raw = (__u8 *)cookie->peer_init + var_size2; | |
1573 | ||
1574 | return sctp_raw_to_bind_addrs(&asoc->base.bind_addr, raw, var_size3, | |
1575 | asoc->ep->base.bind_addr.port, gfp); | |
1576 | } | |
1577 | ||
d808ad9a YH |
1578 | /* Lookup laddr in the bind address list of an association. */ |
1579 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, | |
1da177e4 LT |
1580 | const union sctp_addr *laddr) |
1581 | { | |
559cf710 | 1582 | int found = 0; |
1da177e4 | 1583 | |
1da177e4 LT |
1584 | if ((asoc->base.bind_addr.port == ntohs(laddr->v4.sin_port)) && |
1585 | sctp_bind_addr_match(&asoc->base.bind_addr, laddr, | |
559cf710 | 1586 | sctp_sk(asoc->base.sk))) |
1da177e4 | 1587 | found = 1; |
1da177e4 | 1588 | |
1da177e4 LT |
1589 | return found; |
1590 | } | |
07d93967 VY |
1591 | |
1592 | /* Set an association id for a given association */ | |
1593 | int sctp_assoc_set_id(struct sctp_association *asoc, gfp_t gfp) | |
1594 | { | |
1595 | int assoc_id; | |
1596 | int error = 0; | |
c6ba68a2 VY |
1597 | |
1598 | /* If the id is already assigned, keep it. */ | |
1599 | if (asoc->assoc_id) | |
1600 | return error; | |
07d93967 VY |
1601 | retry: |
1602 | if (unlikely(!idr_pre_get(&sctp_assocs_id, gfp))) | |
1603 | return -ENOMEM; | |
1604 | ||
1605 | spin_lock_bh(&sctp_assocs_id_lock); | |
1606 | error = idr_get_new_above(&sctp_assocs_id, (void *)asoc, | |
4814326b VY |
1607 | idr_low, &assoc_id); |
1608 | if (!error) { | |
1609 | idr_low = assoc_id + 1; | |
1610 | if (idr_low == INT_MAX) | |
1611 | idr_low = 1; | |
1612 | } | |
07d93967 VY |
1613 | spin_unlock_bh(&sctp_assocs_id_lock); |
1614 | if (error == -EAGAIN) | |
1615 | goto retry; | |
1616 | else if (error) | |
1617 | return error; | |
1618 | ||
1619 | asoc->assoc_id = (sctp_assoc_t) assoc_id; | |
1620 | return error; | |
1621 | } | |
a08de64d | 1622 | |
8b4472cc WY |
1623 | /* Free the ASCONF queue */ |
1624 | static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc) | |
1625 | { | |
1626 | struct sctp_chunk *asconf; | |
1627 | struct sctp_chunk *tmp; | |
1628 | ||
1629 | list_for_each_entry_safe(asconf, tmp, &asoc->addip_chunk_list, list) { | |
1630 | list_del_init(&asconf->list); | |
1631 | sctp_chunk_free(asconf); | |
1632 | } | |
1633 | } | |
1634 | ||
a08de64d VY |
1635 | /* Free asconf_ack cache */ |
1636 | static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc) | |
1637 | { | |
1638 | struct sctp_chunk *ack; | |
1639 | struct sctp_chunk *tmp; | |
1640 | ||
1641 | list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list, | |
1642 | transmitted_list) { | |
1643 | list_del_init(&ack->transmitted_list); | |
1644 | sctp_chunk_free(ack); | |
1645 | } | |
1646 | } | |
1647 | ||
1648 | /* Clean up the ASCONF_ACK queue */ | |
1649 | void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc) | |
1650 | { | |
1651 | struct sctp_chunk *ack; | |
1652 | struct sctp_chunk *tmp; | |
1653 | ||
25985edc | 1654 | /* We can remove all the entries from the queue up to |
a08de64d VY |
1655 | * the "Peer-Sequence-Number". |
1656 | */ | |
1657 | list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list, | |
1658 | transmitted_list) { | |
1659 | if (ack->subh.addip_hdr->serial == | |
1660 | htonl(asoc->peer.addip_serial)) | |
1661 | break; | |
1662 | ||
1663 | list_del_init(&ack->transmitted_list); | |
1664 | sctp_chunk_free(ack); | |
1665 | } | |
1666 | } | |
1667 | ||
1668 | /* Find the ASCONF_ACK whose serial number matches ASCONF */ | |
1669 | struct sctp_chunk *sctp_assoc_lookup_asconf_ack( | |
1670 | const struct sctp_association *asoc, | |
1671 | __be32 serial) | |
1672 | { | |
a8699814 | 1673 | struct sctp_chunk *ack; |
a08de64d VY |
1674 | |
1675 | /* Walk through the list of cached ASCONF-ACKs and find the | |
1676 | * ack chunk whose serial number matches that of the request. | |
1677 | */ | |
1678 | list_for_each_entry(ack, &asoc->asconf_ack_list, transmitted_list) { | |
1679 | if (ack->subh.addip_hdr->serial == serial) { | |
1680 | sctp_chunk_hold(ack); | |
a8699814 | 1681 | return ack; |
a08de64d VY |
1682 | } |
1683 | } | |
1684 | ||
a8699814 | 1685 | return NULL; |
a08de64d | 1686 | } |
a000c01e WY |
1687 | |
1688 | void sctp_asconf_queue_teardown(struct sctp_association *asoc) | |
1689 | { | |
1690 | /* Free any cached ASCONF_ACK chunk. */ | |
1691 | sctp_assoc_free_asconf_acks(asoc); | |
1692 | ||
1693 | /* Free the ASCONF queue. */ | |
1694 | sctp_assoc_free_asconf_queue(asoc); | |
1695 | ||
1696 | /* Free any cached ASCONF chunk. */ | |
1697 | if (asoc->addip_last_asconf) | |
1698 | sctp_chunk_free(asoc->addip_last_asconf); | |
1699 | } |