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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) { | |
25cc4ae9 | 437 | if (del_timer(&asoc->timers[i])) |
1da177e4 LT |
438 | sctp_association_put(asoc); |
439 | } | |
440 | ||
441 | /* Free peer's cached cookie. */ | |
a51482bd | 442 | kfree(asoc->peer.cookie); |
730fc3d0 VY |
443 | kfree(asoc->peer.peer_random); |
444 | kfree(asoc->peer.peer_chunks); | |
445 | kfree(asoc->peer.peer_hmacs); | |
1da177e4 LT |
446 | |
447 | /* Release the transport structures. */ | |
448 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
449 | transport = list_entry(pos, struct sctp_transport, transports); | |
45122ca2 | 450 | list_del_rcu(pos); |
1da177e4 LT |
451 | sctp_transport_free(transport); |
452 | } | |
453 | ||
3f7a87d2 FF |
454 | asoc->peer.transport_count = 0; |
455 | ||
a000c01e | 456 | sctp_asconf_queue_teardown(asoc); |
1da177e4 | 457 | |
8a07eb0a MH |
458 | /* Free pending address space being deleted */ |
459 | if (asoc->asconf_addr_del_pending != NULL) | |
460 | kfree(asoc->asconf_addr_del_pending); | |
461 | ||
a29a5bd4 VY |
462 | /* AUTH - Free the endpoint shared keys */ |
463 | sctp_auth_destroy_keys(&asoc->endpoint_shared_keys); | |
464 | ||
465 | /* AUTH - Free the association shared key */ | |
466 | sctp_auth_key_put(asoc->asoc_shared_key); | |
467 | ||
1da177e4 LT |
468 | sctp_association_put(asoc); |
469 | } | |
470 | ||
471 | /* Cleanup and free up an association. */ | |
472 | static void sctp_association_destroy(struct sctp_association *asoc) | |
473 | { | |
474 | SCTP_ASSERT(asoc->base.dead, "Assoc is not dead", return); | |
475 | ||
476 | sctp_endpoint_put(asoc->ep); | |
477 | sock_put(asoc->base.sk); | |
478 | ||
479 | if (asoc->assoc_id != 0) { | |
480 | spin_lock_bh(&sctp_assocs_id_lock); | |
481 | idr_remove(&sctp_assocs_id, asoc->assoc_id); | |
482 | spin_unlock_bh(&sctp_assocs_id_lock); | |
483 | } | |
484 | ||
547b792c | 485 | WARN_ON(atomic_read(&asoc->rmem_alloc)); |
049b3ff5 | 486 | |
1da177e4 LT |
487 | if (asoc->base.malloced) { |
488 | kfree(asoc); | |
489 | SCTP_DBG_OBJCNT_DEC(assoc); | |
490 | } | |
491 | } | |
492 | ||
493 | /* Change the primary destination address for the peer. */ | |
494 | void sctp_assoc_set_primary(struct sctp_association *asoc, | |
495 | struct sctp_transport *transport) | |
496 | { | |
319fa2a2 VY |
497 | int changeover = 0; |
498 | ||
499 | /* it's a changeover only if we already have a primary path | |
500 | * that we are changing | |
501 | */ | |
502 | if (asoc->peer.primary_path != NULL && | |
503 | asoc->peer.primary_path != transport) | |
504 | changeover = 1 ; | |
505 | ||
1da177e4 LT |
506 | asoc->peer.primary_path = transport; |
507 | ||
508 | /* Set a default msg_name for events. */ | |
509 | memcpy(&asoc->peer.primary_addr, &transport->ipaddr, | |
510 | sizeof(union sctp_addr)); | |
511 | ||
512 | /* If the primary path is changing, assume that the | |
513 | * user wants to use this new path. | |
514 | */ | |
ad8fec17 SS |
515 | if ((transport->state == SCTP_ACTIVE) || |
516 | (transport->state == SCTP_UNKNOWN)) | |
1da177e4 LT |
517 | asoc->peer.active_path = transport; |
518 | ||
519 | /* | |
520 | * SFR-CACC algorithm: | |
521 | * Upon the receipt of a request to change the primary | |
522 | * destination address, on the data structure for the new | |
523 | * primary destination, the sender MUST do the following: | |
524 | * | |
525 | * 1) If CHANGEOVER_ACTIVE is set, then there was a switch | |
526 | * to this destination address earlier. The sender MUST set | |
527 | * CYCLING_CHANGEOVER to indicate that this switch is a | |
528 | * double switch to the same destination address. | |
e0e9db17 VY |
529 | * |
530 | * Really, only bother is we have data queued or outstanding on | |
531 | * the association. | |
1da177e4 | 532 | */ |
e0e9db17 VY |
533 | if (!asoc->outqueue.outstanding_bytes && !asoc->outqueue.out_qlen) |
534 | return; | |
535 | ||
1da177e4 | 536 | if (transport->cacc.changeover_active) |
319fa2a2 | 537 | transport->cacc.cycling_changeover = changeover; |
1da177e4 LT |
538 | |
539 | /* 2) The sender MUST set CHANGEOVER_ACTIVE to indicate that | |
540 | * a changeover has occurred. | |
541 | */ | |
319fa2a2 | 542 | transport->cacc.changeover_active = changeover; |
1da177e4 LT |
543 | |
544 | /* 3) The sender MUST store the next TSN to be sent in | |
545 | * next_tsn_at_change. | |
546 | */ | |
547 | transport->cacc.next_tsn_at_change = asoc->next_tsn; | |
548 | } | |
549 | ||
3f7a87d2 FF |
550 | /* Remove a transport from an association. */ |
551 | void sctp_assoc_rm_peer(struct sctp_association *asoc, | |
552 | struct sctp_transport *peer) | |
553 | { | |
554 | struct list_head *pos; | |
555 | struct sctp_transport *transport; | |
556 | ||
557 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_rm_peer:association %p addr: ", | |
558 | " port: %d\n", | |
559 | asoc, | |
560 | (&peer->ipaddr), | |
b3f5b3b6 | 561 | ntohs(peer->ipaddr.v4.sin_port)); |
3f7a87d2 FF |
562 | |
563 | /* If we are to remove the current retran_path, update it | |
564 | * to the next peer before removing this peer from the list. | |
565 | */ | |
566 | if (asoc->peer.retran_path == peer) | |
567 | sctp_assoc_update_retran_path(asoc); | |
568 | ||
569 | /* Remove this peer from the list. */ | |
45122ca2 | 570 | list_del_rcu(&peer->transports); |
3f7a87d2 FF |
571 | |
572 | /* Get the first transport of asoc. */ | |
573 | pos = asoc->peer.transport_addr_list.next; | |
574 | transport = list_entry(pos, struct sctp_transport, transports); | |
575 | ||
576 | /* Update any entries that match the peer to be deleted. */ | |
577 | if (asoc->peer.primary_path == peer) | |
578 | sctp_assoc_set_primary(asoc, transport); | |
579 | if (asoc->peer.active_path == peer) | |
580 | asoc->peer.active_path = transport; | |
9494c7c5 WY |
581 | if (asoc->peer.retran_path == peer) |
582 | asoc->peer.retran_path = transport; | |
3f7a87d2 FF |
583 | if (asoc->peer.last_data_from == peer) |
584 | asoc->peer.last_data_from = transport; | |
585 | ||
586 | /* If we remove the transport an INIT was last sent to, set it to | |
587 | * NULL. Combined with the update of the retran path above, this | |
588 | * will cause the next INIT to be sent to the next available | |
589 | * transport, maintaining the cycle. | |
590 | */ | |
591 | if (asoc->init_last_sent_to == peer) | |
592 | asoc->init_last_sent_to = NULL; | |
593 | ||
6345b199 WY |
594 | /* If we remove the transport an SHUTDOWN was last sent to, set it |
595 | * to NULL. Combined with the update of the retran path above, this | |
596 | * will cause the next SHUTDOWN to be sent to the next available | |
597 | * transport, maintaining the cycle. | |
598 | */ | |
599 | if (asoc->shutdown_last_sent_to == peer) | |
600 | asoc->shutdown_last_sent_to = NULL; | |
601 | ||
10a43cea WY |
602 | /* If we remove the transport an ASCONF was last sent to, set it to |
603 | * NULL. | |
604 | */ | |
605 | if (asoc->addip_last_asconf && | |
606 | asoc->addip_last_asconf->transport == peer) | |
607 | asoc->addip_last_asconf->transport = NULL; | |
608 | ||
31b02e15 VY |
609 | /* If we have something on the transmitted list, we have to |
610 | * save it off. The best place is the active path. | |
611 | */ | |
612 | if (!list_empty(&peer->transmitted)) { | |
613 | struct sctp_transport *active = asoc->peer.active_path; | |
614 | struct sctp_chunk *ch; | |
615 | ||
616 | /* Reset the transport of each chunk on this list */ | |
617 | list_for_each_entry(ch, &peer->transmitted, | |
618 | transmitted_list) { | |
619 | ch->transport = NULL; | |
620 | ch->rtt_in_progress = 0; | |
621 | } | |
622 | ||
623 | list_splice_tail_init(&peer->transmitted, | |
624 | &active->transmitted); | |
625 | ||
626 | /* Start a T3 timer here in case it wasn't running so | |
627 | * that these migrated packets have a chance to get | |
628 | * retrnasmitted. | |
629 | */ | |
630 | if (!timer_pending(&active->T3_rtx_timer)) | |
631 | if (!mod_timer(&active->T3_rtx_timer, | |
632 | jiffies + active->rto)) | |
633 | sctp_transport_hold(active); | |
634 | } | |
635 | ||
3f7a87d2 FF |
636 | asoc->peer.transport_count--; |
637 | ||
638 | sctp_transport_free(peer); | |
639 | } | |
640 | ||
1da177e4 LT |
641 | /* Add a transport address to an association. */ |
642 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, | |
643 | const union sctp_addr *addr, | |
dd0fc66f | 644 | const gfp_t gfp, |
3f7a87d2 | 645 | const int peer_state) |
1da177e4 | 646 | { |
89bf3450 | 647 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
648 | struct sctp_transport *peer; |
649 | struct sctp_sock *sp; | |
650 | unsigned short port; | |
651 | ||
652 | sp = sctp_sk(asoc->base.sk); | |
653 | ||
654 | /* AF_INET and AF_INET6 share common port field. */ | |
4bdf4b5f | 655 | port = ntohs(addr->v4.sin_port); |
1da177e4 | 656 | |
3f7a87d2 | 657 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_add_peer:association %p addr: ", |
ad8fec17 | 658 | " port: %d state:%d\n", |
3f7a87d2 FF |
659 | asoc, |
660 | addr, | |
4bdf4b5f | 661 | port, |
ad8fec17 | 662 | peer_state); |
3f7a87d2 | 663 | |
1da177e4 LT |
664 | /* Set the port if it has not been set yet. */ |
665 | if (0 == asoc->peer.port) | |
666 | asoc->peer.port = port; | |
667 | ||
668 | /* Check to see if this is a duplicate. */ | |
669 | peer = sctp_assoc_lookup_paddr(asoc, addr); | |
3f7a87d2 | 670 | if (peer) { |
add52379 VY |
671 | /* An UNKNOWN state is only set on transports added by |
672 | * user in sctp_connectx() call. Such transports should be | |
673 | * considered CONFIRMED per RFC 4960, Section 5.4. | |
674 | */ | |
ad8fec17 | 675 | if (peer->state == SCTP_UNKNOWN) { |
add52379 | 676 | peer->state = SCTP_ACTIVE; |
ad8fec17 | 677 | } |
1da177e4 | 678 | return peer; |
3f7a87d2 | 679 | } |
1da177e4 | 680 | |
89bf3450 | 681 | peer = sctp_transport_new(net, addr, gfp); |
1da177e4 LT |
682 | if (!peer) |
683 | return NULL; | |
684 | ||
685 | sctp_transport_set_owner(peer, asoc); | |
686 | ||
52ccb8e9 FF |
687 | /* Initialize the peer's heartbeat interval based on the |
688 | * association configured value. | |
689 | */ | |
690 | peer->hbinterval = asoc->hbinterval; | |
691 | ||
692 | /* Set the path max_retrans. */ | |
693 | peer->pathmaxrxt = asoc->pathmaxrxt; | |
694 | ||
5aa93bcf NH |
695 | /* And the partial failure retrnas threshold */ |
696 | peer->pf_retrans = asoc->pf_retrans; | |
697 | ||
52ccb8e9 FF |
698 | /* Initialize the peer's SACK delay timeout based on the |
699 | * association configured value. | |
700 | */ | |
701 | peer->sackdelay = asoc->sackdelay; | |
d364d927 | 702 | peer->sackfreq = asoc->sackfreq; |
52ccb8e9 FF |
703 | |
704 | /* Enable/disable heartbeat, SACK delay, and path MTU discovery | |
705 | * based on association setting. | |
706 | */ | |
707 | peer->param_flags = asoc->param_flags; | |
708 | ||
8da645e1 VY |
709 | sctp_transport_route(peer, NULL, sp); |
710 | ||
1da177e4 | 711 | /* Initialize the pmtu of the transport. */ |
8da645e1 VY |
712 | if (peer->param_flags & SPP_PMTUD_DISABLE) { |
713 | if (asoc->pathmtu) | |
714 | peer->pathmtu = asoc->pathmtu; | |
715 | else | |
716 | peer->pathmtu = SCTP_DEFAULT_MAXSEGMENT; | |
717 | } | |
1da177e4 LT |
718 | |
719 | /* If this is the first transport addr on this association, | |
720 | * initialize the association PMTU to the peer's PMTU. | |
721 | * If not and the current association PMTU is higher than the new | |
722 | * peer's PMTU, reset the association PMTU to the new peer's PMTU. | |
723 | */ | |
52ccb8e9 FF |
724 | if (asoc->pathmtu) |
725 | asoc->pathmtu = min_t(int, peer->pathmtu, asoc->pathmtu); | |
1da177e4 | 726 | else |
52ccb8e9 | 727 | asoc->pathmtu = peer->pathmtu; |
1da177e4 LT |
728 | |
729 | SCTP_DEBUG_PRINTK("sctp_assoc_add_peer:association %p PMTU set to " | |
52ccb8e9 | 730 | "%d\n", asoc, asoc->pathmtu); |
6d0ccbac | 731 | peer->pmtu_pending = 0; |
1da177e4 | 732 | |
f68b2e05 | 733 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); |
1da177e4 LT |
734 | |
735 | /* The asoc->peer.port might not be meaningful yet, but | |
736 | * initialize the packet structure anyway. | |
737 | */ | |
738 | sctp_packet_init(&peer->packet, peer, asoc->base.bind_addr.port, | |
739 | asoc->peer.port); | |
740 | ||
741 | /* 7.2.1 Slow-Start | |
742 | * | |
743 | * o The initial cwnd before DATA transmission or after a sufficiently | |
744 | * long idle period MUST be set to | |
745 | * min(4*MTU, max(2*MTU, 4380 bytes)) | |
746 | * | |
747 | * o The initial value of ssthresh MAY be arbitrarily high | |
748 | * (for example, implementations MAY use the size of the | |
749 | * receiver advertised window). | |
750 | */ | |
52ccb8e9 | 751 | peer->cwnd = min(4*asoc->pathmtu, max_t(__u32, 2*asoc->pathmtu, 4380)); |
1da177e4 LT |
752 | |
753 | /* At this point, we may not have the receiver's advertised window, | |
754 | * so initialize ssthresh to the default value and it will be set | |
755 | * later when we process the INIT. | |
756 | */ | |
757 | peer->ssthresh = SCTP_DEFAULT_MAXWINDOW; | |
758 | ||
759 | peer->partial_bytes_acked = 0; | |
760 | peer->flight_size = 0; | |
46d5a808 | 761 | peer->burst_limited = 0; |
1da177e4 | 762 | |
1da177e4 LT |
763 | /* Set the transport's RTO.initial value */ |
764 | peer->rto = asoc->rto_initial; | |
196d6759 | 765 | sctp_max_rto(asoc, peer); |
1da177e4 | 766 | |
3f7a87d2 FF |
767 | /* Set the peer's active state. */ |
768 | peer->state = peer_state; | |
769 | ||
1da177e4 | 770 | /* Attach the remote transport to our asoc. */ |
45122ca2 | 771 | list_add_tail_rcu(&peer->transports, &asoc->peer.transport_addr_list); |
3f7a87d2 | 772 | asoc->peer.transport_count++; |
1da177e4 LT |
773 | |
774 | /* If we do not yet have a primary path, set one. */ | |
775 | if (!asoc->peer.primary_path) { | |
776 | sctp_assoc_set_primary(asoc, peer); | |
777 | asoc->peer.retran_path = peer; | |
778 | } | |
779 | ||
fbdf501c VY |
780 | if (asoc->peer.active_path == asoc->peer.retran_path && |
781 | peer->state != SCTP_UNCONFIRMED) { | |
1da177e4 | 782 | asoc->peer.retran_path = peer; |
3f7a87d2 | 783 | } |
1da177e4 LT |
784 | |
785 | return peer; | |
786 | } | |
787 | ||
788 | /* Delete a transport address from an association. */ | |
789 | void sctp_assoc_del_peer(struct sctp_association *asoc, | |
790 | const union sctp_addr *addr) | |
791 | { | |
792 | struct list_head *pos; | |
793 | struct list_head *temp; | |
1da177e4 LT |
794 | struct sctp_transport *transport; |
795 | ||
796 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
797 | transport = list_entry(pos, struct sctp_transport, transports); | |
798 | if (sctp_cmp_addr_exact(addr, &transport->ipaddr)) { | |
3f7a87d2 FF |
799 | /* Do book keeping for removing the peer and free it. */ |
800 | sctp_assoc_rm_peer(asoc, transport); | |
1da177e4 LT |
801 | break; |
802 | } | |
803 | } | |
1da177e4 LT |
804 | } |
805 | ||
806 | /* Lookup a transport by address. */ | |
807 | struct sctp_transport *sctp_assoc_lookup_paddr( | |
808 | const struct sctp_association *asoc, | |
809 | const union sctp_addr *address) | |
810 | { | |
811 | struct sctp_transport *t; | |
1da177e4 LT |
812 | |
813 | /* Cycle through all transports searching for a peer address. */ | |
814 | ||
9dbc15f0 RD |
815 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
816 | transports) { | |
1da177e4 LT |
817 | if (sctp_cmp_addr_exact(address, &t->ipaddr)) |
818 | return t; | |
819 | } | |
820 | ||
821 | return NULL; | |
822 | } | |
823 | ||
42e30bf3 VY |
824 | /* Remove all transports except a give one */ |
825 | void sctp_assoc_del_nonprimary_peers(struct sctp_association *asoc, | |
826 | struct sctp_transport *primary) | |
827 | { | |
828 | struct sctp_transport *temp; | |
829 | struct sctp_transport *t; | |
830 | ||
831 | list_for_each_entry_safe(t, temp, &asoc->peer.transport_addr_list, | |
832 | transports) { | |
833 | /* if the current transport is not the primary one, delete it */ | |
834 | if (t != primary) | |
835 | sctp_assoc_rm_peer(asoc, t); | |
836 | } | |
42e30bf3 VY |
837 | } |
838 | ||
1da177e4 LT |
839 | /* Engage in transport control operations. |
840 | * Mark the transport up or down and send a notification to the user. | |
841 | * Select and update the new active and retran paths. | |
842 | */ | |
843 | void sctp_assoc_control_transport(struct sctp_association *asoc, | |
844 | struct sctp_transport *transport, | |
845 | sctp_transport_cmd_t command, | |
846 | sctp_sn_error_t error) | |
847 | { | |
848 | struct sctp_transport *t = NULL; | |
849 | struct sctp_transport *first; | |
850 | struct sctp_transport *second; | |
851 | struct sctp_ulpevent *event; | |
0906e20f | 852 | struct sockaddr_storage addr; |
1da177e4 | 853 | int spc_state = 0; |
5aa93bcf | 854 | bool ulp_notify = true; |
1da177e4 LT |
855 | |
856 | /* Record the transition on the transport. */ | |
857 | switch (command) { | |
858 | case SCTP_TRANSPORT_UP: | |
1ae4114d VY |
859 | /* If we are moving from UNCONFIRMED state due |
860 | * to heartbeat success, report the SCTP_ADDR_CONFIRMED | |
861 | * state to the user, otherwise report SCTP_ADDR_AVAILABLE. | |
862 | */ | |
863 | if (SCTP_UNCONFIRMED == transport->state && | |
864 | SCTP_HEARTBEAT_SUCCESS == error) | |
865 | spc_state = SCTP_ADDR_CONFIRMED; | |
866 | else | |
867 | spc_state = SCTP_ADDR_AVAILABLE; | |
5aa93bcf NH |
868 | /* Don't inform ULP about transition from PF to |
869 | * active state and set cwnd to 1, see SCTP | |
870 | * Quick failover draft section 5.1, point 5 | |
871 | */ | |
872 | if (transport->state == SCTP_PF) { | |
873 | ulp_notify = false; | |
874 | transport->cwnd = 1; | |
875 | } | |
3f7a87d2 | 876 | transport->state = SCTP_ACTIVE; |
1da177e4 LT |
877 | break; |
878 | ||
879 | case SCTP_TRANSPORT_DOWN: | |
40187886 VY |
880 | /* If the transport was never confirmed, do not transition it |
881 | * to inactive state. Also, release the cached route since | |
882 | * there may be a better route next time. | |
cc75689a VY |
883 | */ |
884 | if (transport->state != SCTP_UNCONFIRMED) | |
885 | transport->state = SCTP_INACTIVE; | |
40187886 VY |
886 | else { |
887 | dst_release(transport->dst); | |
888 | transport->dst = NULL; | |
889 | } | |
cc75689a | 890 | |
1da177e4 LT |
891 | spc_state = SCTP_ADDR_UNREACHABLE; |
892 | break; | |
893 | ||
5aa93bcf NH |
894 | case SCTP_TRANSPORT_PF: |
895 | transport->state = SCTP_PF; | |
896 | ulp_notify = false; | |
897 | break; | |
898 | ||
1da177e4 LT |
899 | default: |
900 | return; | |
3ff50b79 | 901 | } |
1da177e4 LT |
902 | |
903 | /* Generate and send a SCTP_PEER_ADDR_CHANGE notification to the | |
904 | * user. | |
905 | */ | |
5aa93bcf NH |
906 | if (ulp_notify) { |
907 | memset(&addr, 0, sizeof(struct sockaddr_storage)); | |
908 | memcpy(&addr, &transport->ipaddr, | |
909 | transport->af_specific->sockaddr_len); | |
910 | event = sctp_ulpevent_make_peer_addr_change(asoc, &addr, | |
911 | 0, spc_state, error, GFP_ATOMIC); | |
912 | if (event) | |
913 | sctp_ulpq_tail_event(&asoc->ulpq, event); | |
914 | } | |
1da177e4 LT |
915 | |
916 | /* Select new active and retran paths. */ | |
917 | ||
918 | /* Look for the two most recently used active transports. | |
919 | * | |
920 | * This code produces the wrong ordering whenever jiffies | |
921 | * rolls over, but we still get usable transports, so we don't | |
922 | * worry about it. | |
923 | */ | |
924 | first = NULL; second = NULL; | |
925 | ||
9dbc15f0 RD |
926 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
927 | transports) { | |
1da177e4 | 928 | |
ad8fec17 | 929 | if ((t->state == SCTP_INACTIVE) || |
5aa93bcf NH |
930 | (t->state == SCTP_UNCONFIRMED) || |
931 | (t->state == SCTP_PF)) | |
1da177e4 LT |
932 | continue; |
933 | if (!first || t->last_time_heard > first->last_time_heard) { | |
934 | second = first; | |
935 | first = t; | |
936 | } | |
937 | if (!second || t->last_time_heard > second->last_time_heard) | |
938 | second = t; | |
939 | } | |
940 | ||
941 | /* RFC 2960 6.4 Multi-Homed SCTP Endpoints | |
942 | * | |
943 | * By default, an endpoint should always transmit to the | |
944 | * primary path, unless the SCTP user explicitly specifies the | |
945 | * destination transport address (and possibly source | |
946 | * transport address) to use. | |
947 | * | |
948 | * [If the primary is active but not most recent, bump the most | |
949 | * recently used transport.] | |
950 | */ | |
ad8fec17 SS |
951 | if (((asoc->peer.primary_path->state == SCTP_ACTIVE) || |
952 | (asoc->peer.primary_path->state == SCTP_UNKNOWN)) && | |
1da177e4 LT |
953 | first != asoc->peer.primary_path) { |
954 | second = first; | |
955 | first = asoc->peer.primary_path; | |
956 | } | |
957 | ||
958 | /* If we failed to find a usable transport, just camp on the | |
959 | * primary, even if it is inactive. | |
960 | */ | |
961 | if (!first) { | |
962 | first = asoc->peer.primary_path; | |
963 | second = asoc->peer.primary_path; | |
964 | } | |
965 | ||
966 | /* Set the active and retran transports. */ | |
967 | asoc->peer.active_path = first; | |
968 | asoc->peer.retran_path = second; | |
969 | } | |
970 | ||
971 | /* Hold a reference to an association. */ | |
972 | void sctp_association_hold(struct sctp_association *asoc) | |
973 | { | |
974 | atomic_inc(&asoc->base.refcnt); | |
975 | } | |
976 | ||
977 | /* Release a reference to an association and cleanup | |
978 | * if there are no more references. | |
979 | */ | |
980 | void sctp_association_put(struct sctp_association *asoc) | |
981 | { | |
982 | if (atomic_dec_and_test(&asoc->base.refcnt)) | |
983 | sctp_association_destroy(asoc); | |
984 | } | |
985 | ||
986 | /* Allocate the next TSN, Transmission Sequence Number, for the given | |
987 | * association. | |
988 | */ | |
989 | __u32 sctp_association_get_next_tsn(struct sctp_association *asoc) | |
990 | { | |
991 | /* From Section 1.6 Serial Number Arithmetic: | |
992 | * Transmission Sequence Numbers wrap around when they reach | |
993 | * 2**32 - 1. That is, the next TSN a DATA chunk MUST use | |
994 | * after transmitting TSN = 2*32 - 1 is TSN = 0. | |
995 | */ | |
996 | __u32 retval = asoc->next_tsn; | |
997 | asoc->next_tsn++; | |
998 | asoc->unack_data++; | |
999 | ||
1000 | return retval; | |
1001 | } | |
1002 | ||
1003 | /* Compare two addresses to see if they match. Wildcard addresses | |
1004 | * only match themselves. | |
1005 | */ | |
1006 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, | |
1007 | const union sctp_addr *ss2) | |
1008 | { | |
1009 | struct sctp_af *af; | |
1010 | ||
1011 | af = sctp_get_af_specific(ss1->sa.sa_family); | |
1012 | if (unlikely(!af)) | |
1013 | return 0; | |
1014 | ||
1015 | return af->cmp_addr(ss1, ss2); | |
1016 | } | |
1017 | ||
1018 | /* Return an ecne chunk to get prepended to a packet. | |
1019 | * Note: We are sly and return a shared, prealloced chunk. FIXME: | |
1020 | * No we don't, but we could/should. | |
1021 | */ | |
1022 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc) | |
1023 | { | |
1024 | struct sctp_chunk *chunk; | |
1025 | ||
1026 | /* Send ECNE if needed. | |
1027 | * Not being able to allocate a chunk here is not deadly. | |
1028 | */ | |
1029 | if (asoc->need_ecne) | |
1030 | chunk = sctp_make_ecne(asoc, asoc->last_ecne_tsn); | |
1031 | else | |
1032 | chunk = NULL; | |
1033 | ||
1034 | return chunk; | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * Find which transport this TSN was sent on. | |
1039 | */ | |
1040 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *asoc, | |
1041 | __u32 tsn) | |
1042 | { | |
1043 | struct sctp_transport *active; | |
1044 | struct sctp_transport *match; | |
1da177e4 LT |
1045 | struct sctp_transport *transport; |
1046 | struct sctp_chunk *chunk; | |
dbc16db1 | 1047 | __be32 key = htonl(tsn); |
1da177e4 LT |
1048 | |
1049 | match = NULL; | |
1050 | ||
1051 | /* | |
1052 | * FIXME: In general, find a more efficient data structure for | |
1053 | * searching. | |
1054 | */ | |
1055 | ||
1056 | /* | |
1057 | * The general strategy is to search each transport's transmitted | |
1058 | * list. Return which transport this TSN lives on. | |
1059 | * | |
1060 | * Let's be hopeful and check the active_path first. | |
1061 | * Another optimization would be to know if there is only one | |
1062 | * outbound path and not have to look for the TSN at all. | |
1063 | * | |
1064 | */ | |
1065 | ||
1066 | active = asoc->peer.active_path; | |
1067 | ||
9dbc15f0 RD |
1068 | list_for_each_entry(chunk, &active->transmitted, |
1069 | transmitted_list) { | |
1da177e4 LT |
1070 | |
1071 | if (key == chunk->subh.data_hdr->tsn) { | |
1072 | match = active; | |
1073 | goto out; | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | /* If not found, go search all the other transports. */ | |
9dbc15f0 RD |
1078 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
1079 | transports) { | |
1da177e4 LT |
1080 | |
1081 | if (transport == active) | |
1082 | break; | |
9dbc15f0 RD |
1083 | list_for_each_entry(chunk, &transport->transmitted, |
1084 | transmitted_list) { | |
1da177e4 LT |
1085 | if (key == chunk->subh.data_hdr->tsn) { |
1086 | match = transport; | |
1087 | goto out; | |
1088 | } | |
1089 | } | |
1090 | } | |
1091 | out: | |
1092 | return match; | |
1093 | } | |
1094 | ||
1095 | /* Is this the association we are looking for? */ | |
1096 | struct sctp_transport *sctp_assoc_is_match(struct sctp_association *asoc, | |
4110cc25 | 1097 | struct net *net, |
1da177e4 LT |
1098 | const union sctp_addr *laddr, |
1099 | const union sctp_addr *paddr) | |
1100 | { | |
1101 | struct sctp_transport *transport; | |
1102 | ||
e2fccedb | 1103 | if ((htons(asoc->base.bind_addr.port) == laddr->v4.sin_port) && |
4110cc25 EB |
1104 | (htons(asoc->peer.port) == paddr->v4.sin_port) && |
1105 | net_eq(sock_net(asoc->base.sk), net)) { | |
1da177e4 LT |
1106 | transport = sctp_assoc_lookup_paddr(asoc, paddr); |
1107 | if (!transport) | |
1108 | goto out; | |
1109 | ||
1110 | if (sctp_bind_addr_match(&asoc->base.bind_addr, laddr, | |
1111 | sctp_sk(asoc->base.sk))) | |
1112 | goto out; | |
1113 | } | |
1114 | transport = NULL; | |
1115 | ||
1116 | out: | |
1da177e4 LT |
1117 | return transport; |
1118 | } | |
1119 | ||
1120 | /* Do delayed input processing. This is scheduled by sctp_rcv(). */ | |
c4028958 | 1121 | static void sctp_assoc_bh_rcv(struct work_struct *work) |
1da177e4 | 1122 | { |
c4028958 DH |
1123 | struct sctp_association *asoc = |
1124 | container_of(work, struct sctp_association, | |
1125 | base.inqueue.immediate); | |
55e26eb9 | 1126 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
1127 | struct sctp_endpoint *ep; |
1128 | struct sctp_chunk *chunk; | |
1da177e4 LT |
1129 | struct sctp_inq *inqueue; |
1130 | int state; | |
1131 | sctp_subtype_t subtype; | |
1132 | int error = 0; | |
1133 | ||
1134 | /* The association should be held so we should be safe. */ | |
1135 | ep = asoc->ep; | |
1da177e4 LT |
1136 | |
1137 | inqueue = &asoc->base.inqueue; | |
1138 | sctp_association_hold(asoc); | |
1139 | while (NULL != (chunk = sctp_inq_pop(inqueue))) { | |
1140 | state = asoc->state; | |
1141 | subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type); | |
1142 | ||
bbd0d598 VY |
1143 | /* SCTP-AUTH, Section 6.3: |
1144 | * The receiver has a list of chunk types which it expects | |
1145 | * to be received only after an AUTH-chunk. This list has | |
1146 | * been sent to the peer during the association setup. It | |
1147 | * MUST silently discard these chunks if they are not placed | |
1148 | * after an AUTH chunk in the packet. | |
1149 | */ | |
1150 | if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth) | |
1151 | continue; | |
1152 | ||
1da177e4 LT |
1153 | /* Remember where the last DATA chunk came from so we |
1154 | * know where to send the SACK. | |
1155 | */ | |
1156 | if (sctp_chunk_is_data(chunk)) | |
1157 | asoc->peer.last_data_from = chunk->transport; | |
196d6759 | 1158 | else { |
55e26eb9 | 1159 | SCTP_INC_STATS(net, SCTP_MIB_INCTRLCHUNKS); |
196d6759 MB |
1160 | asoc->stats.ictrlchunks++; |
1161 | if (chunk->chunk_hdr->type == SCTP_CID_SACK) | |
1162 | asoc->stats.isacks++; | |
1163 | } | |
1da177e4 LT |
1164 | |
1165 | if (chunk->transport) | |
1166 | chunk->transport->last_time_heard = jiffies; | |
1167 | ||
1168 | /* Run through the state machine. */ | |
55e26eb9 | 1169 | error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, |
1da177e4 LT |
1170 | state, ep, asoc, chunk, GFP_ATOMIC); |
1171 | ||
1172 | /* Check to see if the association is freed in response to | |
1173 | * the incoming chunk. If so, get out of the while loop. | |
1174 | */ | |
1175 | if (asoc->base.dead) | |
1176 | break; | |
1177 | ||
1178 | /* If there is an error on chunk, discard this packet. */ | |
1179 | if (error && chunk) | |
1180 | chunk->pdiscard = 1; | |
1181 | } | |
1182 | sctp_association_put(asoc); | |
1183 | } | |
1184 | ||
1185 | /* This routine moves an association from its old sk to a new sk. */ | |
1186 | void sctp_assoc_migrate(struct sctp_association *assoc, struct sock *newsk) | |
1187 | { | |
1188 | struct sctp_sock *newsp = sctp_sk(newsk); | |
1189 | struct sock *oldsk = assoc->base.sk; | |
1190 | ||
1191 | /* Delete the association from the old endpoint's list of | |
1192 | * associations. | |
1193 | */ | |
1194 | list_del_init(&assoc->asocs); | |
1195 | ||
1196 | /* Decrement the backlog value for a TCP-style socket. */ | |
1197 | if (sctp_style(oldsk, TCP)) | |
1198 | oldsk->sk_ack_backlog--; | |
1199 | ||
1200 | /* Release references to the old endpoint and the sock. */ | |
1201 | sctp_endpoint_put(assoc->ep); | |
1202 | sock_put(assoc->base.sk); | |
1203 | ||
1204 | /* Get a reference to the new endpoint. */ | |
1205 | assoc->ep = newsp->ep; | |
1206 | sctp_endpoint_hold(assoc->ep); | |
1207 | ||
1208 | /* Get a reference to the new sock. */ | |
1209 | assoc->base.sk = newsk; | |
1210 | sock_hold(assoc->base.sk); | |
1211 | ||
1212 | /* Add the association to the new endpoint's list of associations. */ | |
1213 | sctp_endpoint_add_asoc(newsp->ep, assoc); | |
1214 | } | |
1215 | ||
1216 | /* Update an association (possibly from unexpected COOKIE-ECHO processing). */ | |
1217 | void sctp_assoc_update(struct sctp_association *asoc, | |
1218 | struct sctp_association *new) | |
1219 | { | |
1220 | struct sctp_transport *trans; | |
1221 | struct list_head *pos, *temp; | |
1222 | ||
1223 | /* Copy in new parameters of peer. */ | |
1224 | asoc->c = new->c; | |
1225 | asoc->peer.rwnd = new->peer.rwnd; | |
1226 | asoc->peer.sack_needed = new->peer.sack_needed; | |
1227 | asoc->peer.i = new->peer.i; | |
8e1ee18c VY |
1228 | sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
1229 | asoc->peer.i.initial_tsn, GFP_ATOMIC); | |
1da177e4 LT |
1230 | |
1231 | /* Remove any peer addresses not present in the new association. */ | |
1232 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
1233 | trans = list_entry(pos, struct sctp_transport, transports); | |
0c42749c VY |
1234 | if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr)) { |
1235 | sctp_assoc_rm_peer(asoc, trans); | |
1236 | continue; | |
1237 | } | |
749bf921 VY |
1238 | |
1239 | if (asoc->state >= SCTP_STATE_ESTABLISHED) | |
1240 | sctp_transport_reset(trans); | |
1da177e4 LT |
1241 | } |
1242 | ||
1243 | /* If the case is A (association restart), use | |
1244 | * initial_tsn as next_tsn. If the case is B, use | |
1245 | * current next_tsn in case data sent to peer | |
1246 | * has been discarded and needs retransmission. | |
1247 | */ | |
1248 | if (asoc->state >= SCTP_STATE_ESTABLISHED) { | |
1249 | asoc->next_tsn = new->next_tsn; | |
1250 | asoc->ctsn_ack_point = new->ctsn_ack_point; | |
1251 | asoc->adv_peer_ack_point = new->adv_peer_ack_point; | |
1252 | ||
1253 | /* Reinitialize SSN for both local streams | |
1254 | * and peer's streams. | |
1255 | */ | |
1256 | sctp_ssnmap_clear(asoc->ssnmap); | |
1257 | ||
0b58a811 VY |
1258 | /* Flush the ULP reassembly and ordered queue. |
1259 | * Any data there will now be stale and will | |
1260 | * cause problems. | |
1261 | */ | |
1262 | sctp_ulpq_flush(&asoc->ulpq); | |
1263 | ||
749bf921 VY |
1264 | /* reset the overall association error count so |
1265 | * that the restarted association doesn't get torn | |
1266 | * down on the next retransmission timer. | |
1267 | */ | |
1268 | asoc->overall_error_count = 0; | |
1269 | ||
1da177e4 LT |
1270 | } else { |
1271 | /* Add any peer addresses from the new association. */ | |
9dbc15f0 RD |
1272 | list_for_each_entry(trans, &new->peer.transport_addr_list, |
1273 | transports) { | |
1da177e4 LT |
1274 | if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr)) |
1275 | sctp_assoc_add_peer(asoc, &trans->ipaddr, | |
ad8fec17 | 1276 | GFP_ATOMIC, trans->state); |
1da177e4 LT |
1277 | } |
1278 | ||
1279 | asoc->ctsn_ack_point = asoc->next_tsn - 1; | |
1280 | asoc->adv_peer_ack_point = asoc->ctsn_ack_point; | |
1281 | if (!asoc->ssnmap) { | |
1282 | /* Move the ssnmap. */ | |
1283 | asoc->ssnmap = new->ssnmap; | |
1284 | new->ssnmap = NULL; | |
1285 | } | |
07d93967 VY |
1286 | |
1287 | if (!asoc->assoc_id) { | |
1288 | /* get a new association id since we don't have one | |
1289 | * yet. | |
1290 | */ | |
1291 | sctp_assoc_set_id(asoc, GFP_ATOMIC); | |
1292 | } | |
1da177e4 | 1293 | } |
a29a5bd4 | 1294 | |
730fc3d0 VY |
1295 | /* SCTP-AUTH: Save the peer parameters from the new assocaitions |
1296 | * and also move the association shared keys over | |
1297 | */ | |
1298 | kfree(asoc->peer.peer_random); | |
1299 | asoc->peer.peer_random = new->peer.peer_random; | |
1300 | new->peer.peer_random = NULL; | |
1301 | ||
1302 | kfree(asoc->peer.peer_chunks); | |
1303 | asoc->peer.peer_chunks = new->peer.peer_chunks; | |
1304 | new->peer.peer_chunks = NULL; | |
1305 | ||
1306 | kfree(asoc->peer.peer_hmacs); | |
1307 | asoc->peer.peer_hmacs = new->peer.peer_hmacs; | |
1308 | new->peer.peer_hmacs = NULL; | |
1309 | ||
1310 | sctp_auth_key_put(asoc->asoc_shared_key); | |
1311 | sctp_auth_asoc_init_active_key(asoc, GFP_ATOMIC); | |
1da177e4 LT |
1312 | } |
1313 | ||
1314 | /* Update the retran path for sending a retransmitted packet. | |
1315 | * Round-robin through the active transports, else round-robin | |
1316 | * through the inactive transports as this is the next best thing | |
1317 | * we can try. | |
1318 | */ | |
1319 | void sctp_assoc_update_retran_path(struct sctp_association *asoc) | |
1320 | { | |
1321 | struct sctp_transport *t, *next; | |
1322 | struct list_head *head = &asoc->peer.transport_addr_list; | |
1323 | struct list_head *pos; | |
1324 | ||
4141ddc0 GJ |
1325 | if (asoc->peer.transport_count == 1) |
1326 | return; | |
1327 | ||
1da177e4 LT |
1328 | /* Find the next transport in a round-robin fashion. */ |
1329 | t = asoc->peer.retran_path; | |
1330 | pos = &t->transports; | |
1331 | next = NULL; | |
1332 | ||
1333 | while (1) { | |
1334 | /* Skip the head. */ | |
1335 | if (pos->next == head) | |
1336 | pos = head->next; | |
1337 | else | |
1338 | pos = pos->next; | |
1339 | ||
1340 | t = list_entry(pos, struct sctp_transport, transports); | |
1341 | ||
4141ddc0 GJ |
1342 | /* We have exhausted the list, but didn't find any |
1343 | * other active transports. If so, use the next | |
1344 | * transport. | |
1345 | */ | |
1346 | if (t == asoc->peer.retran_path) { | |
1347 | t = next; | |
1348 | break; | |
1349 | } | |
1350 | ||
1da177e4 LT |
1351 | /* Try to find an active transport. */ |
1352 | ||
ad8fec17 SS |
1353 | if ((t->state == SCTP_ACTIVE) || |
1354 | (t->state == SCTP_UNKNOWN)) { | |
1da177e4 LT |
1355 | break; |
1356 | } else { | |
1357 | /* Keep track of the next transport in case | |
1358 | * we don't find any active transport. | |
1359 | */ | |
fbdf501c | 1360 | if (t->state != SCTP_UNCONFIRMED && !next) |
1da177e4 LT |
1361 | next = t; |
1362 | } | |
1da177e4 LT |
1363 | } |
1364 | ||
d598b166 VY |
1365 | if (t) |
1366 | asoc->peer.retran_path = t; | |
25f7bf7d VY |
1367 | else |
1368 | t = asoc->peer.retran_path; | |
3f7a87d2 FF |
1369 | |
1370 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association" | |
1371 | " %p addr: ", | |
1372 | " port: %d\n", | |
1373 | asoc, | |
1374 | (&t->ipaddr), | |
b3f5b3b6 | 1375 | ntohs(t->ipaddr.v4.sin_port)); |
3f7a87d2 FF |
1376 | } |
1377 | ||
9919b455 WY |
1378 | /* Choose the transport for sending retransmit packet. */ |
1379 | struct sctp_transport *sctp_assoc_choose_alter_transport( | |
1380 | struct sctp_association *asoc, struct sctp_transport *last_sent_to) | |
3f7a87d2 | 1381 | { |
9919b455 WY |
1382 | /* If this is the first time packet is sent, use the active path, |
1383 | * else use the retran path. If the last packet was sent over the | |
3f7a87d2 FF |
1384 | * retran path, update the retran path and use it. |
1385 | */ | |
9919b455 | 1386 | if (!last_sent_to) |
1da177e4 LT |
1387 | return asoc->peer.active_path; |
1388 | else { | |
9919b455 | 1389 | if (last_sent_to == asoc->peer.retran_path) |
1da177e4 LT |
1390 | sctp_assoc_update_retran_path(asoc); |
1391 | return asoc->peer.retran_path; | |
1392 | } | |
1da177e4 LT |
1393 | } |
1394 | ||
1395 | /* Update the association's pmtu and frag_point by going through all the | |
1396 | * transports. This routine is called when a transport's PMTU has changed. | |
1397 | */ | |
02f3d4ce | 1398 | void sctp_assoc_sync_pmtu(struct sock *sk, struct sctp_association *asoc) |
1da177e4 LT |
1399 | { |
1400 | struct sctp_transport *t; | |
1da177e4 LT |
1401 | __u32 pmtu = 0; |
1402 | ||
1403 | if (!asoc) | |
1404 | return; | |
1405 | ||
1406 | /* Get the lowest pmtu of all the transports. */ | |
9dbc15f0 RD |
1407 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1408 | transports) { | |
8a479491 | 1409 | if (t->pmtu_pending && t->dst) { |
02f3d4ce | 1410 | sctp_transport_update_pmtu(sk, t, dst_mtu(t->dst)); |
8a479491 VY |
1411 | t->pmtu_pending = 0; |
1412 | } | |
52ccb8e9 FF |
1413 | if (!pmtu || (t->pathmtu < pmtu)) |
1414 | pmtu = t->pathmtu; | |
1da177e4 LT |
1415 | } |
1416 | ||
1417 | if (pmtu) { | |
52ccb8e9 | 1418 | asoc->pathmtu = pmtu; |
f68b2e05 | 1419 | asoc->frag_point = sctp_frag_point(asoc, pmtu); |
1da177e4 LT |
1420 | } |
1421 | ||
1422 | SCTP_DEBUG_PRINTK("%s: asoc:%p, pmtu:%d, frag_point:%d\n", | |
0dc47877 | 1423 | __func__, asoc, asoc->pathmtu, asoc->frag_point); |
1da177e4 LT |
1424 | } |
1425 | ||
1426 | /* Should we send a SACK to update our peer? */ | |
1427 | static inline int sctp_peer_needs_update(struct sctp_association *asoc) | |
1428 | { | |
e1fc3b14 | 1429 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
1430 | switch (asoc->state) { |
1431 | case SCTP_STATE_ESTABLISHED: | |
1432 | case SCTP_STATE_SHUTDOWN_PENDING: | |
1433 | case SCTP_STATE_SHUTDOWN_RECEIVED: | |
1434 | case SCTP_STATE_SHUTDOWN_SENT: | |
1435 | if ((asoc->rwnd > asoc->a_rwnd) && | |
90f2f531 | 1436 | ((asoc->rwnd - asoc->a_rwnd) >= max_t(__u32, |
e1fc3b14 | 1437 | (asoc->base.sk->sk_rcvbuf >> net->sctp.rwnd_upd_shift), |
90f2f531 | 1438 | asoc->pathmtu))) |
1da177e4 LT |
1439 | return 1; |
1440 | break; | |
1441 | default: | |
1442 | break; | |
1443 | } | |
1444 | return 0; | |
1445 | } | |
1446 | ||
1447 | /* Increase asoc's rwnd by len and send any window update SACK if needed. */ | |
95c96174 | 1448 | void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned int len) |
1da177e4 LT |
1449 | { |
1450 | struct sctp_chunk *sack; | |
1451 | struct timer_list *timer; | |
1452 | ||
1453 | if (asoc->rwnd_over) { | |
1454 | if (asoc->rwnd_over >= len) { | |
1455 | asoc->rwnd_over -= len; | |
1456 | } else { | |
1457 | asoc->rwnd += (len - asoc->rwnd_over); | |
1458 | asoc->rwnd_over = 0; | |
1459 | } | |
1460 | } else { | |
1461 | asoc->rwnd += len; | |
1462 | } | |
1463 | ||
4d3c46e6 VY |
1464 | /* If we had window pressure, start recovering it |
1465 | * once our rwnd had reached the accumulated pressure | |
1466 | * threshold. The idea is to recover slowly, but up | |
1467 | * to the initial advertised window. | |
1468 | */ | |
1469 | if (asoc->rwnd_press && asoc->rwnd >= asoc->rwnd_press) { | |
1470 | int change = min(asoc->pathmtu, asoc->rwnd_press); | |
1471 | asoc->rwnd += change; | |
1472 | asoc->rwnd_press -= change; | |
1473 | } | |
1474 | ||
1da177e4 | 1475 | SCTP_DEBUG_PRINTK("%s: asoc %p rwnd increased by %d to (%u, %u) " |
0dc47877 | 1476 | "- %u\n", __func__, asoc, len, asoc->rwnd, |
1da177e4 LT |
1477 | asoc->rwnd_over, asoc->a_rwnd); |
1478 | ||
1479 | /* Send a window update SACK if the rwnd has increased by at least the | |
1480 | * minimum of the association's PMTU and half of the receive buffer. | |
1481 | * The algorithm used is similar to the one described in | |
1482 | * Section 4.2.3.3 of RFC 1122. | |
1483 | */ | |
1484 | if (sctp_peer_needs_update(asoc)) { | |
1485 | asoc->a_rwnd = asoc->rwnd; | |
1486 | SCTP_DEBUG_PRINTK("%s: Sending window update SACK- asoc: %p " | |
0dc47877 | 1487 | "rwnd: %u a_rwnd: %u\n", __func__, |
1da177e4 LT |
1488 | asoc, asoc->rwnd, asoc->a_rwnd); |
1489 | sack = sctp_make_sack(asoc); | |
1490 | if (!sack) | |
1491 | return; | |
1492 | ||
1493 | asoc->peer.sack_needed = 0; | |
1494 | ||
1495 | sctp_outq_tail(&asoc->outqueue, sack); | |
1496 | ||
1497 | /* Stop the SACK timer. */ | |
1498 | timer = &asoc->timers[SCTP_EVENT_TIMEOUT_SACK]; | |
25cc4ae9 | 1499 | if (del_timer(timer)) |
1da177e4 LT |
1500 | sctp_association_put(asoc); |
1501 | } | |
1502 | } | |
1503 | ||
1504 | /* Decrease asoc's rwnd by len. */ | |
95c96174 | 1505 | void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned int len) |
1da177e4 | 1506 | { |
4d3c46e6 VY |
1507 | int rx_count; |
1508 | int over = 0; | |
1509 | ||
1da177e4 LT |
1510 | SCTP_ASSERT(asoc->rwnd, "rwnd zero", return); |
1511 | SCTP_ASSERT(!asoc->rwnd_over, "rwnd_over not zero", return); | |
4d3c46e6 VY |
1512 | |
1513 | if (asoc->ep->rcvbuf_policy) | |
1514 | rx_count = atomic_read(&asoc->rmem_alloc); | |
1515 | else | |
1516 | rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc); | |
1517 | ||
1518 | /* If we've reached or overflowed our receive buffer, announce | |
1519 | * a 0 rwnd if rwnd would still be positive. Store the | |
1520 | * the pottential pressure overflow so that the window can be restored | |
1521 | * back to original value. | |
1522 | */ | |
1523 | if (rx_count >= asoc->base.sk->sk_rcvbuf) | |
1524 | over = 1; | |
1525 | ||
1da177e4 LT |
1526 | if (asoc->rwnd >= len) { |
1527 | asoc->rwnd -= len; | |
4d3c46e6 | 1528 | if (over) { |
65883371 | 1529 | asoc->rwnd_press += asoc->rwnd; |
4d3c46e6 VY |
1530 | asoc->rwnd = 0; |
1531 | } | |
1da177e4 LT |
1532 | } else { |
1533 | asoc->rwnd_over = len - asoc->rwnd; | |
1534 | asoc->rwnd = 0; | |
1535 | } | |
4d3c46e6 | 1536 | SCTP_DEBUG_PRINTK("%s: asoc %p rwnd decreased by %d to (%u, %u, %u)\n", |
0dc47877 | 1537 | __func__, asoc, len, asoc->rwnd, |
4d3c46e6 | 1538 | asoc->rwnd_over, asoc->rwnd_press); |
1da177e4 LT |
1539 | } |
1540 | ||
1541 | /* Build the bind address list for the association based on info from the | |
1542 | * local endpoint and the remote peer. | |
1543 | */ | |
3182cd84 | 1544 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, |
409b95af | 1545 | sctp_scope_t scope, gfp_t gfp) |
1da177e4 | 1546 | { |
1da177e4 LT |
1547 | int flags; |
1548 | ||
1549 | /* Use scoping rules to determine the subset of addresses from | |
1550 | * the endpoint. | |
1551 | */ | |
1da177e4 LT |
1552 | flags = (PF_INET6 == asoc->base.sk->sk_family) ? SCTP_ADDR6_ALLOWED : 0; |
1553 | if (asoc->peer.ipv4_address) | |
1554 | flags |= SCTP_ADDR4_PEERSUPP; | |
1555 | if (asoc->peer.ipv6_address) | |
1556 | flags |= SCTP_ADDR6_PEERSUPP; | |
1557 | ||
4db67e80 EB |
1558 | return sctp_bind_addr_copy(sock_net(asoc->base.sk), |
1559 | &asoc->base.bind_addr, | |
1da177e4 LT |
1560 | &asoc->ep->base.bind_addr, |
1561 | scope, gfp, flags); | |
1562 | } | |
1563 | ||
1564 | /* Build the association's bind address list from the cookie. */ | |
1565 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *asoc, | |
3182cd84 | 1566 | struct sctp_cookie *cookie, |
dd0fc66f | 1567 | gfp_t gfp) |
1da177e4 LT |
1568 | { |
1569 | int var_size2 = ntohs(cookie->peer_init->chunk_hdr.length); | |
1570 | int var_size3 = cookie->raw_addr_list_len; | |
1571 | __u8 *raw = (__u8 *)cookie->peer_init + var_size2; | |
1572 | ||
1573 | return sctp_raw_to_bind_addrs(&asoc->base.bind_addr, raw, var_size3, | |
1574 | asoc->ep->base.bind_addr.port, gfp); | |
1575 | } | |
1576 | ||
d808ad9a YH |
1577 | /* Lookup laddr in the bind address list of an association. */ |
1578 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, | |
1da177e4 LT |
1579 | const union sctp_addr *laddr) |
1580 | { | |
559cf710 | 1581 | int found = 0; |
1da177e4 | 1582 | |
1da177e4 LT |
1583 | if ((asoc->base.bind_addr.port == ntohs(laddr->v4.sin_port)) && |
1584 | sctp_bind_addr_match(&asoc->base.bind_addr, laddr, | |
559cf710 | 1585 | sctp_sk(asoc->base.sk))) |
1da177e4 | 1586 | found = 1; |
1da177e4 | 1587 | |
1da177e4 LT |
1588 | return found; |
1589 | } | |
07d93967 VY |
1590 | |
1591 | /* Set an association id for a given association */ | |
1592 | int sctp_assoc_set_id(struct sctp_association *asoc, gfp_t gfp) | |
1593 | { | |
94960e8c TH |
1594 | bool preload = gfp & __GFP_WAIT; |
1595 | int ret; | |
c6ba68a2 VY |
1596 | |
1597 | /* If the id is already assigned, keep it. */ | |
1598 | if (asoc->assoc_id) | |
94960e8c | 1599 | return 0; |
07d93967 | 1600 | |
94960e8c TH |
1601 | if (preload) |
1602 | idr_preload(gfp); | |
07d93967 | 1603 | spin_lock_bh(&sctp_assocs_id_lock); |
94960e8c TH |
1604 | /* 0 is not a valid id, idr_low is always >= 1 */ |
1605 | ret = idr_alloc(&sctp_assocs_id, asoc, idr_low, 0, GFP_NOWAIT); | |
1606 | if (ret >= 0) { | |
1607 | idr_low = ret + 1; | |
4814326b VY |
1608 | if (idr_low == INT_MAX) |
1609 | idr_low = 1; | |
1610 | } | |
07d93967 | 1611 | spin_unlock_bh(&sctp_assocs_id_lock); |
94960e8c TH |
1612 | if (preload) |
1613 | idr_preload_end(); | |
1614 | if (ret < 0) | |
1615 | return ret; | |
07d93967 | 1616 | |
94960e8c TH |
1617 | asoc->assoc_id = (sctp_assoc_t)ret; |
1618 | return 0; | |
07d93967 | 1619 | } |
a08de64d | 1620 | |
8b4472cc WY |
1621 | /* Free the ASCONF queue */ |
1622 | static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc) | |
1623 | { | |
1624 | struct sctp_chunk *asconf; | |
1625 | struct sctp_chunk *tmp; | |
1626 | ||
1627 | list_for_each_entry_safe(asconf, tmp, &asoc->addip_chunk_list, list) { | |
1628 | list_del_init(&asconf->list); | |
1629 | sctp_chunk_free(asconf); | |
1630 | } | |
1631 | } | |
1632 | ||
a08de64d VY |
1633 | /* Free asconf_ack cache */ |
1634 | static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc) | |
1635 | { | |
1636 | struct sctp_chunk *ack; | |
1637 | struct sctp_chunk *tmp; | |
1638 | ||
1639 | list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list, | |
1640 | transmitted_list) { | |
1641 | list_del_init(&ack->transmitted_list); | |
1642 | sctp_chunk_free(ack); | |
1643 | } | |
1644 | } | |
1645 | ||
1646 | /* Clean up the ASCONF_ACK queue */ | |
1647 | void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc) | |
1648 | { | |
1649 | struct sctp_chunk *ack; | |
1650 | struct sctp_chunk *tmp; | |
1651 | ||
25985edc | 1652 | /* We can remove all the entries from the queue up to |
a08de64d VY |
1653 | * the "Peer-Sequence-Number". |
1654 | */ | |
1655 | list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list, | |
1656 | transmitted_list) { | |
1657 | if (ack->subh.addip_hdr->serial == | |
1658 | htonl(asoc->peer.addip_serial)) | |
1659 | break; | |
1660 | ||
1661 | list_del_init(&ack->transmitted_list); | |
1662 | sctp_chunk_free(ack); | |
1663 | } | |
1664 | } | |
1665 | ||
1666 | /* Find the ASCONF_ACK whose serial number matches ASCONF */ | |
1667 | struct sctp_chunk *sctp_assoc_lookup_asconf_ack( | |
1668 | const struct sctp_association *asoc, | |
1669 | __be32 serial) | |
1670 | { | |
a8699814 | 1671 | struct sctp_chunk *ack; |
a08de64d VY |
1672 | |
1673 | /* Walk through the list of cached ASCONF-ACKs and find the | |
1674 | * ack chunk whose serial number matches that of the request. | |
1675 | */ | |
1676 | list_for_each_entry(ack, &asoc->asconf_ack_list, transmitted_list) { | |
1677 | if (ack->subh.addip_hdr->serial == serial) { | |
1678 | sctp_chunk_hold(ack); | |
a8699814 | 1679 | return ack; |
a08de64d VY |
1680 | } |
1681 | } | |
1682 | ||
a8699814 | 1683 | return NULL; |
a08de64d | 1684 | } |
a000c01e WY |
1685 | |
1686 | void sctp_asconf_queue_teardown(struct sctp_association *asoc) | |
1687 | { | |
1688 | /* Free any cached ASCONF_ACK chunk. */ | |
1689 | sctp_assoc_free_asconf_acks(asoc); | |
1690 | ||
1691 | /* Free the ASCONF queue. */ | |
1692 | sctp_assoc_free_asconf_queue(asoc); | |
1693 | ||
1694 | /* Free any cached ASCONF chunk. */ | |
1695 | if (asoc->addip_last_asconf) | |
1696 | sctp_chunk_free(asoc->addip_last_asconf); | |
1697 | } |