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 | |
1da177e4 LT |
69 | /* 1st Level Abstractions. */ |
70 | ||
71 | /* Initialize a new association from provided memory. */ | |
72 | static struct sctp_association *sctp_association_init(struct sctp_association *asoc, | |
73 | const struct sctp_endpoint *ep, | |
74 | const struct sock *sk, | |
75 | sctp_scope_t scope, | |
dd0fc66f | 76 | gfp_t gfp) |
1da177e4 | 77 | { |
e1fc3b14 | 78 | struct net *net = sock_net(sk); |
1da177e4 LT |
79 | struct sctp_sock *sp; |
80 | int i; | |
a29a5bd4 VY |
81 | sctp_paramhdr_t *p; |
82 | int err; | |
1da177e4 LT |
83 | |
84 | /* Retrieve the SCTP per socket area. */ | |
85 | sp = sctp_sk((struct sock *)sk); | |
86 | ||
1da177e4 LT |
87 | /* Discarding const is appropriate here. */ |
88 | asoc->ep = (struct sctp_endpoint *)ep; | |
89 | sctp_endpoint_hold(asoc->ep); | |
90 | ||
91 | /* Hold the sock. */ | |
92 | asoc->base.sk = (struct sock *)sk; | |
93 | sock_hold(asoc->base.sk); | |
94 | ||
95 | /* Initialize the common base substructure. */ | |
96 | asoc->base.type = SCTP_EP_TYPE_ASSOCIATION; | |
97 | ||
98 | /* Initialize the object handling fields. */ | |
99 | atomic_set(&asoc->base.refcnt, 1); | |
100 | asoc->base.dead = 0; | |
101 | asoc->base.malloced = 0; | |
102 | ||
103 | /* Initialize the bind addr area. */ | |
104 | sctp_bind_addr_init(&asoc->base.bind_addr, ep->base.bind_addr.port); | |
1da177e4 LT |
105 | |
106 | asoc->state = SCTP_STATE_CLOSED; | |
107 | ||
108 | /* Set these values from the socket values, a conversion between | |
109 | * millsecons to seconds/microseconds must also be done. | |
110 | */ | |
111 | asoc->cookie_life.tv_sec = sp->assocparams.sasoc_cookie_life / 1000; | |
112 | asoc->cookie_life.tv_usec = (sp->assocparams.sasoc_cookie_life % 1000) | |
113 | * 1000; | |
1da177e4 | 114 | asoc->frag_point = 0; |
f68b2e05 | 115 | asoc->user_frag = sp->user_frag; |
1da177e4 LT |
116 | |
117 | /* Set the association max_retrans and RTO values from the | |
118 | * socket values. | |
119 | */ | |
120 | asoc->max_retrans = sp->assocparams.sasoc_asocmaxrxt; | |
e1fc3b14 | 121 | asoc->pf_retrans = net->sctp.pf_retrans; |
5aa93bcf | 122 | |
1da177e4 LT |
123 | asoc->rto_initial = msecs_to_jiffies(sp->rtoinfo.srto_initial); |
124 | asoc->rto_max = msecs_to_jiffies(sp->rtoinfo.srto_max); | |
125 | asoc->rto_min = msecs_to_jiffies(sp->rtoinfo.srto_min); | |
126 | ||
127 | asoc->overall_error_count = 0; | |
128 | ||
52ccb8e9 FF |
129 | /* Initialize the association's heartbeat interval based on the |
130 | * sock configured value. | |
131 | */ | |
132 | asoc->hbinterval = msecs_to_jiffies(sp->hbinterval); | |
133 | ||
134 | /* Initialize path max retrans value. */ | |
135 | asoc->pathmaxrxt = sp->pathmaxrxt; | |
136 | ||
137 | /* Initialize default path MTU. */ | |
138 | asoc->pathmtu = sp->pathmtu; | |
139 | ||
140 | /* Set association default SACK delay */ | |
141 | asoc->sackdelay = msecs_to_jiffies(sp->sackdelay); | |
d364d927 | 142 | asoc->sackfreq = sp->sackfreq; |
52ccb8e9 FF |
143 | |
144 | /* Set the association default flags controlling | |
145 | * Heartbeat, SACK delay, and Path MTU Discovery. | |
146 | */ | |
147 | asoc->param_flags = sp->param_flags; | |
148 | ||
1da177e4 LT |
149 | /* Initialize the maximum mumber of new data packets that can be sent |
150 | * in a burst. | |
151 | */ | |
70331571 | 152 | asoc->max_burst = sp->max_burst; |
1da177e4 | 153 | |
1e7d3d90 VY |
154 | /* initialize association timers */ |
155 | asoc->timeouts[SCTP_EVENT_TIMEOUT_NONE] = 0; | |
156 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = asoc->rto_initial; | |
157 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = asoc->rto_initial; | |
158 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = asoc->rto_initial; | |
159 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] = 0; | |
160 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = 0; | |
161 | ||
162 | /* sctpimpguide Section 2.12.2 | |
163 | * If the 'T5-shutdown-guard' timer is used, it SHOULD be set to the | |
164 | * recommended value of 5 times 'RTO.Max'. | |
165 | */ | |
d808ad9a | 166 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD] |
1e7d3d90 VY |
167 | = 5 * asoc->rto_max; |
168 | ||
169 | asoc->timeouts[SCTP_EVENT_TIMEOUT_HEARTBEAT] = 0; | |
52ccb8e9 | 170 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = asoc->sackdelay; |
1e7d3d90 | 171 | asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] = |
e1fc3b14 | 172 | min_t(unsigned long, sp->autoclose, net->sctp.max_autoclose) * HZ; |
d808ad9a | 173 | |
421f91d2 | 174 | /* Initializes the timers */ |
b24b8a24 PE |
175 | for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) |
176 | setup_timer(&asoc->timers[i], sctp_timer_events[i], | |
177 | (unsigned long)asoc); | |
1da177e4 LT |
178 | |
179 | /* Pull default initialization values from the sock options. | |
180 | * Note: This assumes that the values have already been | |
181 | * validated in the sock. | |
182 | */ | |
183 | asoc->c.sinit_max_instreams = sp->initmsg.sinit_max_instreams; | |
184 | asoc->c.sinit_num_ostreams = sp->initmsg.sinit_num_ostreams; | |
185 | asoc->max_init_attempts = sp->initmsg.sinit_max_attempts; | |
186 | ||
187 | asoc->max_init_timeo = | |
188 | msecs_to_jiffies(sp->initmsg.sinit_max_init_timeo); | |
189 | ||
190 | /* Allocate storage for the ssnmap after the inbound and outbound | |
191 | * streams have been negotiated during Init. | |
192 | */ | |
193 | asoc->ssnmap = NULL; | |
194 | ||
195 | /* Set the local window size for receive. | |
196 | * This is also the rcvbuf space per association. | |
197 | * RFC 6 - A SCTP receiver MUST be able to receive a minimum of | |
198 | * 1500 bytes in one SCTP packet. | |
199 | */ | |
049b3ff5 | 200 | if ((sk->sk_rcvbuf/2) < SCTP_DEFAULT_MINWINDOW) |
1da177e4 LT |
201 | asoc->rwnd = SCTP_DEFAULT_MINWINDOW; |
202 | else | |
049b3ff5 | 203 | asoc->rwnd = sk->sk_rcvbuf/2; |
1da177e4 LT |
204 | |
205 | asoc->a_rwnd = asoc->rwnd; | |
206 | ||
207 | asoc->rwnd_over = 0; | |
4d3c46e6 | 208 | asoc->rwnd_press = 0; |
1da177e4 LT |
209 | |
210 | /* Use my own max window until I learn something better. */ | |
211 | asoc->peer.rwnd = SCTP_DEFAULT_MAXWINDOW; | |
212 | ||
213 | /* Set the sndbuf size for transmit. */ | |
214 | asoc->sndbuf_used = 0; | |
215 | ||
049b3ff5 NH |
216 | /* Initialize the receive memory counter */ |
217 | atomic_set(&asoc->rmem_alloc, 0); | |
218 | ||
1da177e4 LT |
219 | init_waitqueue_head(&asoc->wait); |
220 | ||
221 | asoc->c.my_vtag = sctp_generate_tag(ep); | |
222 | asoc->peer.i.init_tag = 0; /* INIT needs a vtag of 0. */ | |
223 | asoc->c.peer_vtag = 0; | |
224 | asoc->c.my_ttag = 0; | |
225 | asoc->c.peer_ttag = 0; | |
226 | asoc->c.my_port = ep->base.bind_addr.port; | |
227 | ||
228 | asoc->c.initial_tsn = sctp_generate_tsn(ep); | |
229 | ||
230 | asoc->next_tsn = asoc->c.initial_tsn; | |
231 | ||
232 | asoc->ctsn_ack_point = asoc->next_tsn - 1; | |
233 | asoc->adv_peer_ack_point = asoc->ctsn_ack_point; | |
234 | asoc->highest_sacked = asoc->ctsn_ack_point; | |
235 | asoc->last_cwr_tsn = asoc->ctsn_ack_point; | |
236 | asoc->unack_data = 0; | |
237 | ||
1da177e4 LT |
238 | /* ADDIP Section 4.1 Asconf Chunk Procedures |
239 | * | |
240 | * When an endpoint has an ASCONF signaled change to be sent to the | |
241 | * remote endpoint it should do the following: | |
242 | * ... | |
243 | * A2) a serial number should be assigned to the chunk. The serial | |
244 | * number SHOULD be a monotonically increasing number. The serial | |
245 | * numbers SHOULD be initialized at the start of the | |
246 | * association to the same value as the initial TSN. | |
247 | */ | |
248 | asoc->addip_serial = asoc->c.initial_tsn; | |
249 | ||
79af02c2 | 250 | INIT_LIST_HEAD(&asoc->addip_chunk_list); |
a08de64d | 251 | INIT_LIST_HEAD(&asoc->asconf_ack_list); |
1da177e4 LT |
252 | |
253 | /* Make an empty list of remote transport addresses. */ | |
254 | INIT_LIST_HEAD(&asoc->peer.transport_addr_list); | |
3f7a87d2 | 255 | asoc->peer.transport_count = 0; |
1da177e4 LT |
256 | |
257 | /* RFC 2960 5.1 Normal Establishment of an Association | |
258 | * | |
259 | * After the reception of the first data chunk in an | |
260 | * association the endpoint must immediately respond with a | |
261 | * sack to acknowledge the data chunk. Subsequent | |
262 | * acknowledgements should be done as described in Section | |
263 | * 6.2. | |
264 | * | |
265 | * [We implement this by telling a new association that it | |
266 | * already received one packet.] | |
267 | */ | |
268 | asoc->peer.sack_needed = 1; | |
d364d927 | 269 | asoc->peer.sack_cnt = 0; |
4244854d | 270 | asoc->peer.sack_generation = 1; |
1da177e4 | 271 | |
73d9c4fd VY |
272 | /* Assume that the peer will tell us if he recognizes ASCONF |
273 | * as part of INIT exchange. | |
274 | * The sctp_addip_noauth option is there for backward compatibilty | |
275 | * and will revert old behavior. | |
1da177e4 | 276 | */ |
88799fe5 | 277 | asoc->peer.asconf_capable = 0; |
e1fc3b14 | 278 | if (net->sctp.addip_noauth) |
73d9c4fd | 279 | asoc->peer.asconf_capable = 1; |
8a07eb0a MH |
280 | asoc->asconf_addr_del_pending = NULL; |
281 | asoc->src_out_of_asoc_ok = 0; | |
6af29ccc | 282 | asoc->new_transport = NULL; |
1da177e4 LT |
283 | |
284 | /* Create an input queue. */ | |
285 | sctp_inq_init(&asoc->base.inqueue); | |
c4028958 | 286 | sctp_inq_set_th_handler(&asoc->base.inqueue, sctp_assoc_bh_rcv); |
1da177e4 LT |
287 | |
288 | /* Create an output queue. */ | |
289 | sctp_outq_init(asoc, &asoc->outqueue); | |
290 | ||
291 | if (!sctp_ulpq_init(&asoc->ulpq, asoc)) | |
292 | goto fail_init; | |
293 | ||
8e1ee18c | 294 | memset(&asoc->peer.tsn_map, 0, sizeof(struct sctp_tsnmap)); |
1da177e4 LT |
295 | |
296 | asoc->need_ecne = 0; | |
297 | ||
298 | asoc->assoc_id = 0; | |
299 | ||
300 | /* Assume that peer would support both address types unless we are | |
301 | * told otherwise. | |
302 | */ | |
303 | asoc->peer.ipv4_address = 1; | |
a2c39584 WY |
304 | if (asoc->base.sk->sk_family == PF_INET6) |
305 | asoc->peer.ipv6_address = 1; | |
1da177e4 LT |
306 | INIT_LIST_HEAD(&asoc->asocs); |
307 | ||
308 | asoc->autoclose = sp->autoclose; | |
309 | ||
310 | asoc->default_stream = sp->default_stream; | |
311 | asoc->default_ppid = sp->default_ppid; | |
312 | asoc->default_flags = sp->default_flags; | |
313 | asoc->default_context = sp->default_context; | |
314 | asoc->default_timetolive = sp->default_timetolive; | |
6ab792f5 | 315 | asoc->default_rcv_context = sp->default_rcv_context; |
1da177e4 | 316 | |
196d6759 MB |
317 | /* SCTP_GET_ASSOC_STATS COUNTERS */ |
318 | memset(&asoc->stats, 0, sizeof(struct sctp_priv_assoc_stats)); | |
319 | ||
a29a5bd4 VY |
320 | /* AUTH related initializations */ |
321 | INIT_LIST_HEAD(&asoc->endpoint_shared_keys); | |
322 | err = sctp_auth_asoc_copy_shkeys(ep, asoc, gfp); | |
323 | if (err) | |
324 | goto fail_init; | |
325 | ||
326 | asoc->active_key_id = ep->active_key_id; | |
327 | asoc->asoc_shared_key = NULL; | |
328 | ||
329 | asoc->default_hmac_id = 0; | |
330 | /* Save the hmacs and chunks list into this association */ | |
331 | if (ep->auth_hmacs_list) | |
332 | memcpy(asoc->c.auth_hmacs, ep->auth_hmacs_list, | |
333 | ntohs(ep->auth_hmacs_list->param_hdr.length)); | |
334 | if (ep->auth_chunk_list) | |
335 | memcpy(asoc->c.auth_chunks, ep->auth_chunk_list, | |
336 | ntohs(ep->auth_chunk_list->param_hdr.length)); | |
337 | ||
338 | /* Get the AUTH random number for this association */ | |
339 | p = (sctp_paramhdr_t *)asoc->c.auth_random; | |
340 | p->type = SCTP_PARAM_RANDOM; | |
341 | p->length = htons(sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH); | |
342 | get_random_bytes(p+1, SCTP_AUTH_RANDOM_LENGTH); | |
343 | ||
1da177e4 LT |
344 | return asoc; |
345 | ||
346 | fail_init: | |
347 | sctp_endpoint_put(asoc->ep); | |
348 | sock_put(asoc->base.sk); | |
349 | return NULL; | |
350 | } | |
351 | ||
352 | /* Allocate and initialize a new association */ | |
353 | struct sctp_association *sctp_association_new(const struct sctp_endpoint *ep, | |
354 | const struct sock *sk, | |
3182cd84 | 355 | sctp_scope_t scope, |
dd0fc66f | 356 | gfp_t gfp) |
1da177e4 LT |
357 | { |
358 | struct sctp_association *asoc; | |
359 | ||
360 | asoc = t_new(struct sctp_association, gfp); | |
361 | if (!asoc) | |
362 | goto fail; | |
363 | ||
364 | if (!sctp_association_init(asoc, ep, sk, scope, gfp)) | |
365 | goto fail_init; | |
366 | ||
367 | asoc->base.malloced = 1; | |
368 | SCTP_DBG_OBJCNT_INC(assoc); | |
3f7a87d2 | 369 | SCTP_DEBUG_PRINTK("Created asoc %p\n", asoc); |
1da177e4 LT |
370 | |
371 | return asoc; | |
372 | ||
373 | fail_init: | |
374 | kfree(asoc); | |
375 | fail: | |
376 | return NULL; | |
377 | } | |
378 | ||
379 | /* Free this association if possible. There may still be users, so | |
380 | * the actual deallocation may be delayed. | |
381 | */ | |
382 | void sctp_association_free(struct sctp_association *asoc) | |
383 | { | |
384 | struct sock *sk = asoc->base.sk; | |
385 | struct sctp_transport *transport; | |
386 | struct list_head *pos, *temp; | |
387 | int i; | |
388 | ||
de76e695 VY |
389 | /* Only real associations count against the endpoint, so |
390 | * don't bother for if this is a temporary association. | |
391 | */ | |
392 | if (!asoc->temp) { | |
393 | list_del(&asoc->asocs); | |
394 | ||
395 | /* Decrement the backlog value for a TCP-style listening | |
396 | * socket. | |
397 | */ | |
398 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) | |
399 | sk->sk_ack_backlog--; | |
400 | } | |
1da177e4 LT |
401 | |
402 | /* Mark as dead, so other users can know this structure is | |
403 | * going away. | |
404 | */ | |
405 | asoc->base.dead = 1; | |
406 | ||
407 | /* Dispose of any data lying around in the outqueue. */ | |
408 | sctp_outq_free(&asoc->outqueue); | |
409 | ||
410 | /* Dispose of any pending messages for the upper layer. */ | |
411 | sctp_ulpq_free(&asoc->ulpq); | |
412 | ||
413 | /* Dispose of any pending chunks on the inqueue. */ | |
414 | sctp_inq_free(&asoc->base.inqueue); | |
415 | ||
8e1ee18c VY |
416 | sctp_tsnmap_free(&asoc->peer.tsn_map); |
417 | ||
1da177e4 LT |
418 | /* Free ssnmap storage. */ |
419 | sctp_ssnmap_free(asoc->ssnmap); | |
420 | ||
421 | /* Clean up the bound address list. */ | |
422 | sctp_bind_addr_free(&asoc->base.bind_addr); | |
423 | ||
424 | /* Do we need to go through all of our timers and | |
425 | * delete them? To be safe we will try to delete all, but we | |
426 | * should be able to go through and make a guess based | |
427 | * on our state. | |
428 | */ | |
429 | for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) { | |
25cc4ae9 | 430 | if (del_timer(&asoc->timers[i])) |
1da177e4 LT |
431 | sctp_association_put(asoc); |
432 | } | |
433 | ||
434 | /* Free peer's cached cookie. */ | |
a51482bd | 435 | kfree(asoc->peer.cookie); |
730fc3d0 VY |
436 | kfree(asoc->peer.peer_random); |
437 | kfree(asoc->peer.peer_chunks); | |
438 | kfree(asoc->peer.peer_hmacs); | |
1da177e4 LT |
439 | |
440 | /* Release the transport structures. */ | |
441 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
442 | transport = list_entry(pos, struct sctp_transport, transports); | |
45122ca2 | 443 | list_del_rcu(pos); |
1da177e4 LT |
444 | sctp_transport_free(transport); |
445 | } | |
446 | ||
3f7a87d2 FF |
447 | asoc->peer.transport_count = 0; |
448 | ||
a000c01e | 449 | sctp_asconf_queue_teardown(asoc); |
1da177e4 | 450 | |
8a07eb0a MH |
451 | /* Free pending address space being deleted */ |
452 | if (asoc->asconf_addr_del_pending != NULL) | |
453 | kfree(asoc->asconf_addr_del_pending); | |
454 | ||
a29a5bd4 VY |
455 | /* AUTH - Free the endpoint shared keys */ |
456 | sctp_auth_destroy_keys(&asoc->endpoint_shared_keys); | |
457 | ||
458 | /* AUTH - Free the association shared key */ | |
459 | sctp_auth_key_put(asoc->asoc_shared_key); | |
460 | ||
1da177e4 LT |
461 | sctp_association_put(asoc); |
462 | } | |
463 | ||
464 | /* Cleanup and free up an association. */ | |
465 | static void sctp_association_destroy(struct sctp_association *asoc) | |
466 | { | |
467 | SCTP_ASSERT(asoc->base.dead, "Assoc is not dead", return); | |
468 | ||
469 | sctp_endpoint_put(asoc->ep); | |
470 | sock_put(asoc->base.sk); | |
471 | ||
472 | if (asoc->assoc_id != 0) { | |
473 | spin_lock_bh(&sctp_assocs_id_lock); | |
474 | idr_remove(&sctp_assocs_id, asoc->assoc_id); | |
475 | spin_unlock_bh(&sctp_assocs_id_lock); | |
476 | } | |
477 | ||
547b792c | 478 | WARN_ON(atomic_read(&asoc->rmem_alloc)); |
049b3ff5 | 479 | |
1da177e4 LT |
480 | if (asoc->base.malloced) { |
481 | kfree(asoc); | |
482 | SCTP_DBG_OBJCNT_DEC(assoc); | |
483 | } | |
484 | } | |
485 | ||
486 | /* Change the primary destination address for the peer. */ | |
487 | void sctp_assoc_set_primary(struct sctp_association *asoc, | |
488 | struct sctp_transport *transport) | |
489 | { | |
319fa2a2 VY |
490 | int changeover = 0; |
491 | ||
492 | /* it's a changeover only if we already have a primary path | |
493 | * that we are changing | |
494 | */ | |
495 | if (asoc->peer.primary_path != NULL && | |
496 | asoc->peer.primary_path != transport) | |
497 | changeover = 1 ; | |
498 | ||
1da177e4 LT |
499 | asoc->peer.primary_path = transport; |
500 | ||
501 | /* Set a default msg_name for events. */ | |
502 | memcpy(&asoc->peer.primary_addr, &transport->ipaddr, | |
503 | sizeof(union sctp_addr)); | |
504 | ||
505 | /* If the primary path is changing, assume that the | |
506 | * user wants to use this new path. | |
507 | */ | |
ad8fec17 SS |
508 | if ((transport->state == SCTP_ACTIVE) || |
509 | (transport->state == SCTP_UNKNOWN)) | |
1da177e4 LT |
510 | asoc->peer.active_path = transport; |
511 | ||
512 | /* | |
513 | * SFR-CACC algorithm: | |
514 | * Upon the receipt of a request to change the primary | |
515 | * destination address, on the data structure for the new | |
516 | * primary destination, the sender MUST do the following: | |
517 | * | |
518 | * 1) If CHANGEOVER_ACTIVE is set, then there was a switch | |
519 | * to this destination address earlier. The sender MUST set | |
520 | * CYCLING_CHANGEOVER to indicate that this switch is a | |
521 | * double switch to the same destination address. | |
e0e9db17 VY |
522 | * |
523 | * Really, only bother is we have data queued or outstanding on | |
524 | * the association. | |
1da177e4 | 525 | */ |
e0e9db17 VY |
526 | if (!asoc->outqueue.outstanding_bytes && !asoc->outqueue.out_qlen) |
527 | return; | |
528 | ||
1da177e4 | 529 | if (transport->cacc.changeover_active) |
319fa2a2 | 530 | transport->cacc.cycling_changeover = changeover; |
1da177e4 LT |
531 | |
532 | /* 2) The sender MUST set CHANGEOVER_ACTIVE to indicate that | |
533 | * a changeover has occurred. | |
534 | */ | |
319fa2a2 | 535 | transport->cacc.changeover_active = changeover; |
1da177e4 LT |
536 | |
537 | /* 3) The sender MUST store the next TSN to be sent in | |
538 | * next_tsn_at_change. | |
539 | */ | |
540 | transport->cacc.next_tsn_at_change = asoc->next_tsn; | |
541 | } | |
542 | ||
3f7a87d2 FF |
543 | /* Remove a transport from an association. */ |
544 | void sctp_assoc_rm_peer(struct sctp_association *asoc, | |
545 | struct sctp_transport *peer) | |
546 | { | |
547 | struct list_head *pos; | |
548 | struct sctp_transport *transport; | |
549 | ||
550 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_rm_peer:association %p addr: ", | |
551 | " port: %d\n", | |
552 | asoc, | |
553 | (&peer->ipaddr), | |
b3f5b3b6 | 554 | ntohs(peer->ipaddr.v4.sin_port)); |
3f7a87d2 FF |
555 | |
556 | /* If we are to remove the current retran_path, update it | |
557 | * to the next peer before removing this peer from the list. | |
558 | */ | |
559 | if (asoc->peer.retran_path == peer) | |
560 | sctp_assoc_update_retran_path(asoc); | |
561 | ||
562 | /* Remove this peer from the list. */ | |
45122ca2 | 563 | list_del_rcu(&peer->transports); |
3f7a87d2 FF |
564 | |
565 | /* Get the first transport of asoc. */ | |
566 | pos = asoc->peer.transport_addr_list.next; | |
567 | transport = list_entry(pos, struct sctp_transport, transports); | |
568 | ||
569 | /* Update any entries that match the peer to be deleted. */ | |
570 | if (asoc->peer.primary_path == peer) | |
571 | sctp_assoc_set_primary(asoc, transport); | |
572 | if (asoc->peer.active_path == peer) | |
573 | asoc->peer.active_path = transport; | |
9494c7c5 WY |
574 | if (asoc->peer.retran_path == peer) |
575 | asoc->peer.retran_path = transport; | |
3f7a87d2 FF |
576 | if (asoc->peer.last_data_from == peer) |
577 | asoc->peer.last_data_from = transport; | |
578 | ||
579 | /* If we remove the transport an INIT was last sent to, set it to | |
580 | * NULL. Combined with the update of the retran path above, this | |
581 | * will cause the next INIT to be sent to the next available | |
582 | * transport, maintaining the cycle. | |
583 | */ | |
584 | if (asoc->init_last_sent_to == peer) | |
585 | asoc->init_last_sent_to = NULL; | |
586 | ||
6345b199 WY |
587 | /* If we remove the transport an SHUTDOWN was last sent to, set it |
588 | * to NULL. Combined with the update of the retran path above, this | |
589 | * will cause the next SHUTDOWN to be sent to the next available | |
590 | * transport, maintaining the cycle. | |
591 | */ | |
592 | if (asoc->shutdown_last_sent_to == peer) | |
593 | asoc->shutdown_last_sent_to = NULL; | |
594 | ||
10a43cea WY |
595 | /* If we remove the transport an ASCONF was last sent to, set it to |
596 | * NULL. | |
597 | */ | |
598 | if (asoc->addip_last_asconf && | |
599 | asoc->addip_last_asconf->transport == peer) | |
600 | asoc->addip_last_asconf->transport = NULL; | |
601 | ||
31b02e15 VY |
602 | /* If we have something on the transmitted list, we have to |
603 | * save it off. The best place is the active path. | |
604 | */ | |
605 | if (!list_empty(&peer->transmitted)) { | |
606 | struct sctp_transport *active = asoc->peer.active_path; | |
607 | struct sctp_chunk *ch; | |
608 | ||
609 | /* Reset the transport of each chunk on this list */ | |
610 | list_for_each_entry(ch, &peer->transmitted, | |
611 | transmitted_list) { | |
612 | ch->transport = NULL; | |
613 | ch->rtt_in_progress = 0; | |
614 | } | |
615 | ||
616 | list_splice_tail_init(&peer->transmitted, | |
617 | &active->transmitted); | |
618 | ||
619 | /* Start a T3 timer here in case it wasn't running so | |
620 | * that these migrated packets have a chance to get | |
621 | * retrnasmitted. | |
622 | */ | |
623 | if (!timer_pending(&active->T3_rtx_timer)) | |
624 | if (!mod_timer(&active->T3_rtx_timer, | |
625 | jiffies + active->rto)) | |
626 | sctp_transport_hold(active); | |
627 | } | |
628 | ||
3f7a87d2 FF |
629 | asoc->peer.transport_count--; |
630 | ||
631 | sctp_transport_free(peer); | |
632 | } | |
633 | ||
1da177e4 LT |
634 | /* Add a transport address to an association. */ |
635 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, | |
636 | const union sctp_addr *addr, | |
dd0fc66f | 637 | const gfp_t gfp, |
3f7a87d2 | 638 | const int peer_state) |
1da177e4 | 639 | { |
89bf3450 | 640 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
641 | struct sctp_transport *peer; |
642 | struct sctp_sock *sp; | |
643 | unsigned short port; | |
644 | ||
645 | sp = sctp_sk(asoc->base.sk); | |
646 | ||
647 | /* AF_INET and AF_INET6 share common port field. */ | |
4bdf4b5f | 648 | port = ntohs(addr->v4.sin_port); |
1da177e4 | 649 | |
3f7a87d2 | 650 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_add_peer:association %p addr: ", |
ad8fec17 | 651 | " port: %d state:%d\n", |
3f7a87d2 FF |
652 | asoc, |
653 | addr, | |
4bdf4b5f | 654 | port, |
ad8fec17 | 655 | peer_state); |
3f7a87d2 | 656 | |
1da177e4 LT |
657 | /* Set the port if it has not been set yet. */ |
658 | if (0 == asoc->peer.port) | |
659 | asoc->peer.port = port; | |
660 | ||
661 | /* Check to see if this is a duplicate. */ | |
662 | peer = sctp_assoc_lookup_paddr(asoc, addr); | |
3f7a87d2 | 663 | if (peer) { |
add52379 VY |
664 | /* An UNKNOWN state is only set on transports added by |
665 | * user in sctp_connectx() call. Such transports should be | |
666 | * considered CONFIRMED per RFC 4960, Section 5.4. | |
667 | */ | |
ad8fec17 | 668 | if (peer->state == SCTP_UNKNOWN) { |
add52379 | 669 | peer->state = SCTP_ACTIVE; |
ad8fec17 | 670 | } |
1da177e4 | 671 | return peer; |
3f7a87d2 | 672 | } |
1da177e4 | 673 | |
89bf3450 | 674 | peer = sctp_transport_new(net, addr, gfp); |
1da177e4 LT |
675 | if (!peer) |
676 | return NULL; | |
677 | ||
678 | sctp_transport_set_owner(peer, asoc); | |
679 | ||
52ccb8e9 FF |
680 | /* Initialize the peer's heartbeat interval based on the |
681 | * association configured value. | |
682 | */ | |
683 | peer->hbinterval = asoc->hbinterval; | |
684 | ||
685 | /* Set the path max_retrans. */ | |
686 | peer->pathmaxrxt = asoc->pathmaxrxt; | |
687 | ||
5aa93bcf NH |
688 | /* And the partial failure retrnas threshold */ |
689 | peer->pf_retrans = asoc->pf_retrans; | |
690 | ||
52ccb8e9 FF |
691 | /* Initialize the peer's SACK delay timeout based on the |
692 | * association configured value. | |
693 | */ | |
694 | peer->sackdelay = asoc->sackdelay; | |
d364d927 | 695 | peer->sackfreq = asoc->sackfreq; |
52ccb8e9 FF |
696 | |
697 | /* Enable/disable heartbeat, SACK delay, and path MTU discovery | |
698 | * based on association setting. | |
699 | */ | |
700 | peer->param_flags = asoc->param_flags; | |
701 | ||
8da645e1 VY |
702 | sctp_transport_route(peer, NULL, sp); |
703 | ||
1da177e4 | 704 | /* Initialize the pmtu of the transport. */ |
8da645e1 VY |
705 | if (peer->param_flags & SPP_PMTUD_DISABLE) { |
706 | if (asoc->pathmtu) | |
707 | peer->pathmtu = asoc->pathmtu; | |
708 | else | |
709 | peer->pathmtu = SCTP_DEFAULT_MAXSEGMENT; | |
710 | } | |
1da177e4 LT |
711 | |
712 | /* If this is the first transport addr on this association, | |
713 | * initialize the association PMTU to the peer's PMTU. | |
714 | * If not and the current association PMTU is higher than the new | |
715 | * peer's PMTU, reset the association PMTU to the new peer's PMTU. | |
716 | */ | |
52ccb8e9 FF |
717 | if (asoc->pathmtu) |
718 | asoc->pathmtu = min_t(int, peer->pathmtu, asoc->pathmtu); | |
1da177e4 | 719 | else |
52ccb8e9 | 720 | asoc->pathmtu = peer->pathmtu; |
1da177e4 LT |
721 | |
722 | SCTP_DEBUG_PRINTK("sctp_assoc_add_peer:association %p PMTU set to " | |
52ccb8e9 | 723 | "%d\n", asoc, asoc->pathmtu); |
6d0ccbac | 724 | peer->pmtu_pending = 0; |
1da177e4 | 725 | |
f68b2e05 | 726 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); |
1da177e4 LT |
727 | |
728 | /* The asoc->peer.port might not be meaningful yet, but | |
729 | * initialize the packet structure anyway. | |
730 | */ | |
731 | sctp_packet_init(&peer->packet, peer, asoc->base.bind_addr.port, | |
732 | asoc->peer.port); | |
733 | ||
734 | /* 7.2.1 Slow-Start | |
735 | * | |
736 | * o The initial cwnd before DATA transmission or after a sufficiently | |
737 | * long idle period MUST be set to | |
738 | * min(4*MTU, max(2*MTU, 4380 bytes)) | |
739 | * | |
740 | * o The initial value of ssthresh MAY be arbitrarily high | |
741 | * (for example, implementations MAY use the size of the | |
742 | * receiver advertised window). | |
743 | */ | |
52ccb8e9 | 744 | peer->cwnd = min(4*asoc->pathmtu, max_t(__u32, 2*asoc->pathmtu, 4380)); |
1da177e4 LT |
745 | |
746 | /* At this point, we may not have the receiver's advertised window, | |
747 | * so initialize ssthresh to the default value and it will be set | |
748 | * later when we process the INIT. | |
749 | */ | |
750 | peer->ssthresh = SCTP_DEFAULT_MAXWINDOW; | |
751 | ||
752 | peer->partial_bytes_acked = 0; | |
753 | peer->flight_size = 0; | |
46d5a808 | 754 | peer->burst_limited = 0; |
1da177e4 | 755 | |
1da177e4 LT |
756 | /* Set the transport's RTO.initial value */ |
757 | peer->rto = asoc->rto_initial; | |
196d6759 | 758 | sctp_max_rto(asoc, peer); |
1da177e4 | 759 | |
3f7a87d2 FF |
760 | /* Set the peer's active state. */ |
761 | peer->state = peer_state; | |
762 | ||
1da177e4 | 763 | /* Attach the remote transport to our asoc. */ |
45122ca2 | 764 | list_add_tail_rcu(&peer->transports, &asoc->peer.transport_addr_list); |
3f7a87d2 | 765 | asoc->peer.transport_count++; |
1da177e4 LT |
766 | |
767 | /* If we do not yet have a primary path, set one. */ | |
768 | if (!asoc->peer.primary_path) { | |
769 | sctp_assoc_set_primary(asoc, peer); | |
770 | asoc->peer.retran_path = peer; | |
771 | } | |
772 | ||
fbdf501c VY |
773 | if (asoc->peer.active_path == asoc->peer.retran_path && |
774 | peer->state != SCTP_UNCONFIRMED) { | |
1da177e4 | 775 | asoc->peer.retran_path = peer; |
3f7a87d2 | 776 | } |
1da177e4 LT |
777 | |
778 | return peer; | |
779 | } | |
780 | ||
781 | /* Delete a transport address from an association. */ | |
782 | void sctp_assoc_del_peer(struct sctp_association *asoc, | |
783 | const union sctp_addr *addr) | |
784 | { | |
785 | struct list_head *pos; | |
786 | struct list_head *temp; | |
1da177e4 LT |
787 | struct sctp_transport *transport; |
788 | ||
789 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
790 | transport = list_entry(pos, struct sctp_transport, transports); | |
791 | if (sctp_cmp_addr_exact(addr, &transport->ipaddr)) { | |
3f7a87d2 FF |
792 | /* Do book keeping for removing the peer and free it. */ |
793 | sctp_assoc_rm_peer(asoc, transport); | |
1da177e4 LT |
794 | break; |
795 | } | |
796 | } | |
1da177e4 LT |
797 | } |
798 | ||
799 | /* Lookup a transport by address. */ | |
800 | struct sctp_transport *sctp_assoc_lookup_paddr( | |
801 | const struct sctp_association *asoc, | |
802 | const union sctp_addr *address) | |
803 | { | |
804 | struct sctp_transport *t; | |
1da177e4 LT |
805 | |
806 | /* Cycle through all transports searching for a peer address. */ | |
807 | ||
9dbc15f0 RD |
808 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
809 | transports) { | |
1da177e4 LT |
810 | if (sctp_cmp_addr_exact(address, &t->ipaddr)) |
811 | return t; | |
812 | } | |
813 | ||
814 | return NULL; | |
815 | } | |
816 | ||
42e30bf3 VY |
817 | /* Remove all transports except a give one */ |
818 | void sctp_assoc_del_nonprimary_peers(struct sctp_association *asoc, | |
819 | struct sctp_transport *primary) | |
820 | { | |
821 | struct sctp_transport *temp; | |
822 | struct sctp_transport *t; | |
823 | ||
824 | list_for_each_entry_safe(t, temp, &asoc->peer.transport_addr_list, | |
825 | transports) { | |
826 | /* if the current transport is not the primary one, delete it */ | |
827 | if (t != primary) | |
828 | sctp_assoc_rm_peer(asoc, t); | |
829 | } | |
42e30bf3 VY |
830 | } |
831 | ||
1da177e4 LT |
832 | /* Engage in transport control operations. |
833 | * Mark the transport up or down and send a notification to the user. | |
834 | * Select and update the new active and retran paths. | |
835 | */ | |
836 | void sctp_assoc_control_transport(struct sctp_association *asoc, | |
837 | struct sctp_transport *transport, | |
838 | sctp_transport_cmd_t command, | |
839 | sctp_sn_error_t error) | |
840 | { | |
841 | struct sctp_transport *t = NULL; | |
842 | struct sctp_transport *first; | |
843 | struct sctp_transport *second; | |
844 | struct sctp_ulpevent *event; | |
0906e20f | 845 | struct sockaddr_storage addr; |
1da177e4 | 846 | int spc_state = 0; |
5aa93bcf | 847 | bool ulp_notify = true; |
1da177e4 LT |
848 | |
849 | /* Record the transition on the transport. */ | |
850 | switch (command) { | |
851 | case SCTP_TRANSPORT_UP: | |
1ae4114d VY |
852 | /* If we are moving from UNCONFIRMED state due |
853 | * to heartbeat success, report the SCTP_ADDR_CONFIRMED | |
854 | * state to the user, otherwise report SCTP_ADDR_AVAILABLE. | |
855 | */ | |
856 | if (SCTP_UNCONFIRMED == transport->state && | |
857 | SCTP_HEARTBEAT_SUCCESS == error) | |
858 | spc_state = SCTP_ADDR_CONFIRMED; | |
859 | else | |
860 | spc_state = SCTP_ADDR_AVAILABLE; | |
5aa93bcf NH |
861 | /* Don't inform ULP about transition from PF to |
862 | * active state and set cwnd to 1, see SCTP | |
863 | * Quick failover draft section 5.1, point 5 | |
864 | */ | |
865 | if (transport->state == SCTP_PF) { | |
866 | ulp_notify = false; | |
867 | transport->cwnd = 1; | |
868 | } | |
3f7a87d2 | 869 | transport->state = SCTP_ACTIVE; |
1da177e4 LT |
870 | break; |
871 | ||
872 | case SCTP_TRANSPORT_DOWN: | |
40187886 VY |
873 | /* If the transport was never confirmed, do not transition it |
874 | * to inactive state. Also, release the cached route since | |
875 | * there may be a better route next time. | |
cc75689a VY |
876 | */ |
877 | if (transport->state != SCTP_UNCONFIRMED) | |
878 | transport->state = SCTP_INACTIVE; | |
40187886 VY |
879 | else { |
880 | dst_release(transport->dst); | |
881 | transport->dst = NULL; | |
882 | } | |
cc75689a | 883 | |
1da177e4 LT |
884 | spc_state = SCTP_ADDR_UNREACHABLE; |
885 | break; | |
886 | ||
5aa93bcf NH |
887 | case SCTP_TRANSPORT_PF: |
888 | transport->state = SCTP_PF; | |
889 | ulp_notify = false; | |
890 | break; | |
891 | ||
1da177e4 LT |
892 | default: |
893 | return; | |
3ff50b79 | 894 | } |
1da177e4 LT |
895 | |
896 | /* Generate and send a SCTP_PEER_ADDR_CHANGE notification to the | |
897 | * user. | |
898 | */ | |
5aa93bcf NH |
899 | if (ulp_notify) { |
900 | memset(&addr, 0, sizeof(struct sockaddr_storage)); | |
901 | memcpy(&addr, &transport->ipaddr, | |
902 | transport->af_specific->sockaddr_len); | |
903 | event = sctp_ulpevent_make_peer_addr_change(asoc, &addr, | |
904 | 0, spc_state, error, GFP_ATOMIC); | |
905 | if (event) | |
906 | sctp_ulpq_tail_event(&asoc->ulpq, event); | |
907 | } | |
1da177e4 LT |
908 | |
909 | /* Select new active and retran paths. */ | |
910 | ||
911 | /* Look for the two most recently used active transports. | |
912 | * | |
913 | * This code produces the wrong ordering whenever jiffies | |
914 | * rolls over, but we still get usable transports, so we don't | |
915 | * worry about it. | |
916 | */ | |
917 | first = NULL; second = NULL; | |
918 | ||
9dbc15f0 RD |
919 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
920 | transports) { | |
1da177e4 | 921 | |
ad8fec17 | 922 | if ((t->state == SCTP_INACTIVE) || |
5aa93bcf NH |
923 | (t->state == SCTP_UNCONFIRMED) || |
924 | (t->state == SCTP_PF)) | |
1da177e4 LT |
925 | continue; |
926 | if (!first || t->last_time_heard > first->last_time_heard) { | |
927 | second = first; | |
928 | first = t; | |
929 | } | |
930 | if (!second || t->last_time_heard > second->last_time_heard) | |
931 | second = t; | |
932 | } | |
933 | ||
934 | /* RFC 2960 6.4 Multi-Homed SCTP Endpoints | |
935 | * | |
936 | * By default, an endpoint should always transmit to the | |
937 | * primary path, unless the SCTP user explicitly specifies the | |
938 | * destination transport address (and possibly source | |
939 | * transport address) to use. | |
940 | * | |
941 | * [If the primary is active but not most recent, bump the most | |
942 | * recently used transport.] | |
943 | */ | |
ad8fec17 SS |
944 | if (((asoc->peer.primary_path->state == SCTP_ACTIVE) || |
945 | (asoc->peer.primary_path->state == SCTP_UNKNOWN)) && | |
1da177e4 LT |
946 | first != asoc->peer.primary_path) { |
947 | second = first; | |
948 | first = asoc->peer.primary_path; | |
949 | } | |
950 | ||
951 | /* If we failed to find a usable transport, just camp on the | |
952 | * primary, even if it is inactive. | |
953 | */ | |
954 | if (!first) { | |
955 | first = asoc->peer.primary_path; | |
956 | second = asoc->peer.primary_path; | |
957 | } | |
958 | ||
959 | /* Set the active and retran transports. */ | |
960 | asoc->peer.active_path = first; | |
961 | asoc->peer.retran_path = second; | |
962 | } | |
963 | ||
964 | /* Hold a reference to an association. */ | |
965 | void sctp_association_hold(struct sctp_association *asoc) | |
966 | { | |
967 | atomic_inc(&asoc->base.refcnt); | |
968 | } | |
969 | ||
970 | /* Release a reference to an association and cleanup | |
971 | * if there are no more references. | |
972 | */ | |
973 | void sctp_association_put(struct sctp_association *asoc) | |
974 | { | |
975 | if (atomic_dec_and_test(&asoc->base.refcnt)) | |
976 | sctp_association_destroy(asoc); | |
977 | } | |
978 | ||
979 | /* Allocate the next TSN, Transmission Sequence Number, for the given | |
980 | * association. | |
981 | */ | |
982 | __u32 sctp_association_get_next_tsn(struct sctp_association *asoc) | |
983 | { | |
984 | /* From Section 1.6 Serial Number Arithmetic: | |
985 | * Transmission Sequence Numbers wrap around when they reach | |
986 | * 2**32 - 1. That is, the next TSN a DATA chunk MUST use | |
987 | * after transmitting TSN = 2*32 - 1 is TSN = 0. | |
988 | */ | |
989 | __u32 retval = asoc->next_tsn; | |
990 | asoc->next_tsn++; | |
991 | asoc->unack_data++; | |
992 | ||
993 | return retval; | |
994 | } | |
995 | ||
996 | /* Compare two addresses to see if they match. Wildcard addresses | |
997 | * only match themselves. | |
998 | */ | |
999 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, | |
1000 | const union sctp_addr *ss2) | |
1001 | { | |
1002 | struct sctp_af *af; | |
1003 | ||
1004 | af = sctp_get_af_specific(ss1->sa.sa_family); | |
1005 | if (unlikely(!af)) | |
1006 | return 0; | |
1007 | ||
1008 | return af->cmp_addr(ss1, ss2); | |
1009 | } | |
1010 | ||
1011 | /* Return an ecne chunk to get prepended to a packet. | |
1012 | * Note: We are sly and return a shared, prealloced chunk. FIXME: | |
1013 | * No we don't, but we could/should. | |
1014 | */ | |
1015 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc) | |
1016 | { | |
1017 | struct sctp_chunk *chunk; | |
1018 | ||
1019 | /* Send ECNE if needed. | |
1020 | * Not being able to allocate a chunk here is not deadly. | |
1021 | */ | |
1022 | if (asoc->need_ecne) | |
1023 | chunk = sctp_make_ecne(asoc, asoc->last_ecne_tsn); | |
1024 | else | |
1025 | chunk = NULL; | |
1026 | ||
1027 | return chunk; | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Find which transport this TSN was sent on. | |
1032 | */ | |
1033 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *asoc, | |
1034 | __u32 tsn) | |
1035 | { | |
1036 | struct sctp_transport *active; | |
1037 | struct sctp_transport *match; | |
1da177e4 LT |
1038 | struct sctp_transport *transport; |
1039 | struct sctp_chunk *chunk; | |
dbc16db1 | 1040 | __be32 key = htonl(tsn); |
1da177e4 LT |
1041 | |
1042 | match = NULL; | |
1043 | ||
1044 | /* | |
1045 | * FIXME: In general, find a more efficient data structure for | |
1046 | * searching. | |
1047 | */ | |
1048 | ||
1049 | /* | |
1050 | * The general strategy is to search each transport's transmitted | |
1051 | * list. Return which transport this TSN lives on. | |
1052 | * | |
1053 | * Let's be hopeful and check the active_path first. | |
1054 | * Another optimization would be to know if there is only one | |
1055 | * outbound path and not have to look for the TSN at all. | |
1056 | * | |
1057 | */ | |
1058 | ||
1059 | active = asoc->peer.active_path; | |
1060 | ||
9dbc15f0 RD |
1061 | list_for_each_entry(chunk, &active->transmitted, |
1062 | transmitted_list) { | |
1da177e4 LT |
1063 | |
1064 | if (key == chunk->subh.data_hdr->tsn) { | |
1065 | match = active; | |
1066 | goto out; | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | /* If not found, go search all the other transports. */ | |
9dbc15f0 RD |
1071 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
1072 | transports) { | |
1da177e4 LT |
1073 | |
1074 | if (transport == active) | |
2317f449 | 1075 | continue; |
9dbc15f0 RD |
1076 | list_for_each_entry(chunk, &transport->transmitted, |
1077 | transmitted_list) { | |
1da177e4 LT |
1078 | if (key == chunk->subh.data_hdr->tsn) { |
1079 | match = transport; | |
1080 | goto out; | |
1081 | } | |
1082 | } | |
1083 | } | |
1084 | out: | |
1085 | return match; | |
1086 | } | |
1087 | ||
1088 | /* Is this the association we are looking for? */ | |
1089 | struct sctp_transport *sctp_assoc_is_match(struct sctp_association *asoc, | |
4110cc25 | 1090 | struct net *net, |
1da177e4 LT |
1091 | const union sctp_addr *laddr, |
1092 | const union sctp_addr *paddr) | |
1093 | { | |
1094 | struct sctp_transport *transport; | |
1095 | ||
e2fccedb | 1096 | if ((htons(asoc->base.bind_addr.port) == laddr->v4.sin_port) && |
4110cc25 EB |
1097 | (htons(asoc->peer.port) == paddr->v4.sin_port) && |
1098 | net_eq(sock_net(asoc->base.sk), net)) { | |
1da177e4 LT |
1099 | transport = sctp_assoc_lookup_paddr(asoc, paddr); |
1100 | if (!transport) | |
1101 | goto out; | |
1102 | ||
1103 | if (sctp_bind_addr_match(&asoc->base.bind_addr, laddr, | |
1104 | sctp_sk(asoc->base.sk))) | |
1105 | goto out; | |
1106 | } | |
1107 | transport = NULL; | |
1108 | ||
1109 | out: | |
1da177e4 LT |
1110 | return transport; |
1111 | } | |
1112 | ||
1113 | /* Do delayed input processing. This is scheduled by sctp_rcv(). */ | |
c4028958 | 1114 | static void sctp_assoc_bh_rcv(struct work_struct *work) |
1da177e4 | 1115 | { |
c4028958 DH |
1116 | struct sctp_association *asoc = |
1117 | container_of(work, struct sctp_association, | |
1118 | base.inqueue.immediate); | |
55e26eb9 | 1119 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
1120 | struct sctp_endpoint *ep; |
1121 | struct sctp_chunk *chunk; | |
1da177e4 LT |
1122 | struct sctp_inq *inqueue; |
1123 | int state; | |
1124 | sctp_subtype_t subtype; | |
1125 | int error = 0; | |
1126 | ||
1127 | /* The association should be held so we should be safe. */ | |
1128 | ep = asoc->ep; | |
1da177e4 LT |
1129 | |
1130 | inqueue = &asoc->base.inqueue; | |
1131 | sctp_association_hold(asoc); | |
1132 | while (NULL != (chunk = sctp_inq_pop(inqueue))) { | |
1133 | state = asoc->state; | |
1134 | subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type); | |
1135 | ||
bbd0d598 VY |
1136 | /* SCTP-AUTH, Section 6.3: |
1137 | * The receiver has a list of chunk types which it expects | |
1138 | * to be received only after an AUTH-chunk. This list has | |
1139 | * been sent to the peer during the association setup. It | |
1140 | * MUST silently discard these chunks if they are not placed | |
1141 | * after an AUTH chunk in the packet. | |
1142 | */ | |
1143 | if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth) | |
1144 | continue; | |
1145 | ||
1da177e4 LT |
1146 | /* Remember where the last DATA chunk came from so we |
1147 | * know where to send the SACK. | |
1148 | */ | |
1149 | if (sctp_chunk_is_data(chunk)) | |
1150 | asoc->peer.last_data_from = chunk->transport; | |
196d6759 | 1151 | else { |
55e26eb9 | 1152 | SCTP_INC_STATS(net, SCTP_MIB_INCTRLCHUNKS); |
196d6759 MB |
1153 | asoc->stats.ictrlchunks++; |
1154 | if (chunk->chunk_hdr->type == SCTP_CID_SACK) | |
1155 | asoc->stats.isacks++; | |
1156 | } | |
1da177e4 LT |
1157 | |
1158 | if (chunk->transport) | |
1159 | chunk->transport->last_time_heard = jiffies; | |
1160 | ||
1161 | /* Run through the state machine. */ | |
55e26eb9 | 1162 | error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, |
1da177e4 LT |
1163 | state, ep, asoc, chunk, GFP_ATOMIC); |
1164 | ||
1165 | /* Check to see if the association is freed in response to | |
1166 | * the incoming chunk. If so, get out of the while loop. | |
1167 | */ | |
1168 | if (asoc->base.dead) | |
1169 | break; | |
1170 | ||
1171 | /* If there is an error on chunk, discard this packet. */ | |
1172 | if (error && chunk) | |
1173 | chunk->pdiscard = 1; | |
1174 | } | |
1175 | sctp_association_put(asoc); | |
1176 | } | |
1177 | ||
1178 | /* This routine moves an association from its old sk to a new sk. */ | |
1179 | void sctp_assoc_migrate(struct sctp_association *assoc, struct sock *newsk) | |
1180 | { | |
1181 | struct sctp_sock *newsp = sctp_sk(newsk); | |
1182 | struct sock *oldsk = assoc->base.sk; | |
1183 | ||
1184 | /* Delete the association from the old endpoint's list of | |
1185 | * associations. | |
1186 | */ | |
1187 | list_del_init(&assoc->asocs); | |
1188 | ||
1189 | /* Decrement the backlog value for a TCP-style socket. */ | |
1190 | if (sctp_style(oldsk, TCP)) | |
1191 | oldsk->sk_ack_backlog--; | |
1192 | ||
1193 | /* Release references to the old endpoint and the sock. */ | |
1194 | sctp_endpoint_put(assoc->ep); | |
1195 | sock_put(assoc->base.sk); | |
1196 | ||
1197 | /* Get a reference to the new endpoint. */ | |
1198 | assoc->ep = newsp->ep; | |
1199 | sctp_endpoint_hold(assoc->ep); | |
1200 | ||
1201 | /* Get a reference to the new sock. */ | |
1202 | assoc->base.sk = newsk; | |
1203 | sock_hold(assoc->base.sk); | |
1204 | ||
1205 | /* Add the association to the new endpoint's list of associations. */ | |
1206 | sctp_endpoint_add_asoc(newsp->ep, assoc); | |
1207 | } | |
1208 | ||
1209 | /* Update an association (possibly from unexpected COOKIE-ECHO processing). */ | |
1210 | void sctp_assoc_update(struct sctp_association *asoc, | |
1211 | struct sctp_association *new) | |
1212 | { | |
1213 | struct sctp_transport *trans; | |
1214 | struct list_head *pos, *temp; | |
1215 | ||
1216 | /* Copy in new parameters of peer. */ | |
1217 | asoc->c = new->c; | |
1218 | asoc->peer.rwnd = new->peer.rwnd; | |
1219 | asoc->peer.sack_needed = new->peer.sack_needed; | |
1220 | asoc->peer.i = new->peer.i; | |
8e1ee18c VY |
1221 | sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
1222 | asoc->peer.i.initial_tsn, GFP_ATOMIC); | |
1da177e4 LT |
1223 | |
1224 | /* Remove any peer addresses not present in the new association. */ | |
1225 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { | |
1226 | trans = list_entry(pos, struct sctp_transport, transports); | |
0c42749c VY |
1227 | if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr)) { |
1228 | sctp_assoc_rm_peer(asoc, trans); | |
1229 | continue; | |
1230 | } | |
749bf921 VY |
1231 | |
1232 | if (asoc->state >= SCTP_STATE_ESTABLISHED) | |
1233 | sctp_transport_reset(trans); | |
1da177e4 LT |
1234 | } |
1235 | ||
1236 | /* If the case is A (association restart), use | |
1237 | * initial_tsn as next_tsn. If the case is B, use | |
1238 | * current next_tsn in case data sent to peer | |
1239 | * has been discarded and needs retransmission. | |
1240 | */ | |
1241 | if (asoc->state >= SCTP_STATE_ESTABLISHED) { | |
1242 | asoc->next_tsn = new->next_tsn; | |
1243 | asoc->ctsn_ack_point = new->ctsn_ack_point; | |
1244 | asoc->adv_peer_ack_point = new->adv_peer_ack_point; | |
1245 | ||
1246 | /* Reinitialize SSN for both local streams | |
1247 | * and peer's streams. | |
1248 | */ | |
1249 | sctp_ssnmap_clear(asoc->ssnmap); | |
1250 | ||
0b58a811 VY |
1251 | /* Flush the ULP reassembly and ordered queue. |
1252 | * Any data there will now be stale and will | |
1253 | * cause problems. | |
1254 | */ | |
1255 | sctp_ulpq_flush(&asoc->ulpq); | |
1256 | ||
749bf921 VY |
1257 | /* reset the overall association error count so |
1258 | * that the restarted association doesn't get torn | |
1259 | * down on the next retransmission timer. | |
1260 | */ | |
1261 | asoc->overall_error_count = 0; | |
1262 | ||
1da177e4 LT |
1263 | } else { |
1264 | /* Add any peer addresses from the new association. */ | |
9dbc15f0 RD |
1265 | list_for_each_entry(trans, &new->peer.transport_addr_list, |
1266 | transports) { | |
1da177e4 LT |
1267 | if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr)) |
1268 | sctp_assoc_add_peer(asoc, &trans->ipaddr, | |
ad8fec17 | 1269 | GFP_ATOMIC, trans->state); |
1da177e4 LT |
1270 | } |
1271 | ||
1272 | asoc->ctsn_ack_point = asoc->next_tsn - 1; | |
1273 | asoc->adv_peer_ack_point = asoc->ctsn_ack_point; | |
1274 | if (!asoc->ssnmap) { | |
1275 | /* Move the ssnmap. */ | |
1276 | asoc->ssnmap = new->ssnmap; | |
1277 | new->ssnmap = NULL; | |
1278 | } | |
07d93967 VY |
1279 | |
1280 | if (!asoc->assoc_id) { | |
1281 | /* get a new association id since we don't have one | |
1282 | * yet. | |
1283 | */ | |
1284 | sctp_assoc_set_id(asoc, GFP_ATOMIC); | |
1285 | } | |
1da177e4 | 1286 | } |
a29a5bd4 | 1287 | |
730fc3d0 VY |
1288 | /* SCTP-AUTH: Save the peer parameters from the new assocaitions |
1289 | * and also move the association shared keys over | |
1290 | */ | |
1291 | kfree(asoc->peer.peer_random); | |
1292 | asoc->peer.peer_random = new->peer.peer_random; | |
1293 | new->peer.peer_random = NULL; | |
1294 | ||
1295 | kfree(asoc->peer.peer_chunks); | |
1296 | asoc->peer.peer_chunks = new->peer.peer_chunks; | |
1297 | new->peer.peer_chunks = NULL; | |
1298 | ||
1299 | kfree(asoc->peer.peer_hmacs); | |
1300 | asoc->peer.peer_hmacs = new->peer.peer_hmacs; | |
1301 | new->peer.peer_hmacs = NULL; | |
1302 | ||
1303 | sctp_auth_key_put(asoc->asoc_shared_key); | |
1304 | sctp_auth_asoc_init_active_key(asoc, GFP_ATOMIC); | |
1da177e4 LT |
1305 | } |
1306 | ||
1307 | /* Update the retran path for sending a retransmitted packet. | |
1308 | * Round-robin through the active transports, else round-robin | |
1309 | * through the inactive transports as this is the next best thing | |
1310 | * we can try. | |
1311 | */ | |
1312 | void sctp_assoc_update_retran_path(struct sctp_association *asoc) | |
1313 | { | |
1314 | struct sctp_transport *t, *next; | |
1315 | struct list_head *head = &asoc->peer.transport_addr_list; | |
1316 | struct list_head *pos; | |
1317 | ||
4141ddc0 GJ |
1318 | if (asoc->peer.transport_count == 1) |
1319 | return; | |
1320 | ||
1da177e4 LT |
1321 | /* Find the next transport in a round-robin fashion. */ |
1322 | t = asoc->peer.retran_path; | |
1323 | pos = &t->transports; | |
1324 | next = NULL; | |
1325 | ||
1326 | while (1) { | |
1327 | /* Skip the head. */ | |
1328 | if (pos->next == head) | |
1329 | pos = head->next; | |
1330 | else | |
1331 | pos = pos->next; | |
1332 | ||
1333 | t = list_entry(pos, struct sctp_transport, transports); | |
1334 | ||
4141ddc0 GJ |
1335 | /* We have exhausted the list, but didn't find any |
1336 | * other active transports. If so, use the next | |
1337 | * transport. | |
1338 | */ | |
1339 | if (t == asoc->peer.retran_path) { | |
1340 | t = next; | |
1341 | break; | |
1342 | } | |
1343 | ||
1da177e4 LT |
1344 | /* Try to find an active transport. */ |
1345 | ||
ad8fec17 SS |
1346 | if ((t->state == SCTP_ACTIVE) || |
1347 | (t->state == SCTP_UNKNOWN)) { | |
1da177e4 LT |
1348 | break; |
1349 | } else { | |
1350 | /* Keep track of the next transport in case | |
1351 | * we don't find any active transport. | |
1352 | */ | |
fbdf501c | 1353 | if (t->state != SCTP_UNCONFIRMED && !next) |
1da177e4 LT |
1354 | next = t; |
1355 | } | |
1da177e4 LT |
1356 | } |
1357 | ||
d598b166 VY |
1358 | if (t) |
1359 | asoc->peer.retran_path = t; | |
25f7bf7d VY |
1360 | else |
1361 | t = asoc->peer.retran_path; | |
3f7a87d2 FF |
1362 | |
1363 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association" | |
1364 | " %p addr: ", | |
1365 | " port: %d\n", | |
1366 | asoc, | |
1367 | (&t->ipaddr), | |
b3f5b3b6 | 1368 | ntohs(t->ipaddr.v4.sin_port)); |
3f7a87d2 FF |
1369 | } |
1370 | ||
9919b455 WY |
1371 | /* Choose the transport for sending retransmit packet. */ |
1372 | struct sctp_transport *sctp_assoc_choose_alter_transport( | |
1373 | struct sctp_association *asoc, struct sctp_transport *last_sent_to) | |
3f7a87d2 | 1374 | { |
9919b455 WY |
1375 | /* If this is the first time packet is sent, use the active path, |
1376 | * else use the retran path. If the last packet was sent over the | |
3f7a87d2 FF |
1377 | * retran path, update the retran path and use it. |
1378 | */ | |
9919b455 | 1379 | if (!last_sent_to) |
1da177e4 LT |
1380 | return asoc->peer.active_path; |
1381 | else { | |
9919b455 | 1382 | if (last_sent_to == asoc->peer.retran_path) |
1da177e4 LT |
1383 | sctp_assoc_update_retran_path(asoc); |
1384 | return asoc->peer.retran_path; | |
1385 | } | |
1da177e4 LT |
1386 | } |
1387 | ||
1388 | /* Update the association's pmtu and frag_point by going through all the | |
1389 | * transports. This routine is called when a transport's PMTU has changed. | |
1390 | */ | |
02f3d4ce | 1391 | void sctp_assoc_sync_pmtu(struct sock *sk, struct sctp_association *asoc) |
1da177e4 LT |
1392 | { |
1393 | struct sctp_transport *t; | |
1da177e4 LT |
1394 | __u32 pmtu = 0; |
1395 | ||
1396 | if (!asoc) | |
1397 | return; | |
1398 | ||
1399 | /* Get the lowest pmtu of all the transports. */ | |
9dbc15f0 RD |
1400 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
1401 | transports) { | |
8a479491 | 1402 | if (t->pmtu_pending && t->dst) { |
02f3d4ce | 1403 | sctp_transport_update_pmtu(sk, t, dst_mtu(t->dst)); |
8a479491 VY |
1404 | t->pmtu_pending = 0; |
1405 | } | |
52ccb8e9 FF |
1406 | if (!pmtu || (t->pathmtu < pmtu)) |
1407 | pmtu = t->pathmtu; | |
1da177e4 LT |
1408 | } |
1409 | ||
1410 | if (pmtu) { | |
52ccb8e9 | 1411 | asoc->pathmtu = pmtu; |
f68b2e05 | 1412 | asoc->frag_point = sctp_frag_point(asoc, pmtu); |
1da177e4 LT |
1413 | } |
1414 | ||
1415 | SCTP_DEBUG_PRINTK("%s: asoc:%p, pmtu:%d, frag_point:%d\n", | |
0dc47877 | 1416 | __func__, asoc, asoc->pathmtu, asoc->frag_point); |
1da177e4 LT |
1417 | } |
1418 | ||
1419 | /* Should we send a SACK to update our peer? */ | |
1420 | static inline int sctp_peer_needs_update(struct sctp_association *asoc) | |
1421 | { | |
e1fc3b14 | 1422 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
1423 | switch (asoc->state) { |
1424 | case SCTP_STATE_ESTABLISHED: | |
1425 | case SCTP_STATE_SHUTDOWN_PENDING: | |
1426 | case SCTP_STATE_SHUTDOWN_RECEIVED: | |
1427 | case SCTP_STATE_SHUTDOWN_SENT: | |
1428 | if ((asoc->rwnd > asoc->a_rwnd) && | |
90f2f531 | 1429 | ((asoc->rwnd - asoc->a_rwnd) >= max_t(__u32, |
e1fc3b14 | 1430 | (asoc->base.sk->sk_rcvbuf >> net->sctp.rwnd_upd_shift), |
90f2f531 | 1431 | asoc->pathmtu))) |
1da177e4 LT |
1432 | return 1; |
1433 | break; | |
1434 | default: | |
1435 | break; | |
1436 | } | |
1437 | return 0; | |
1438 | } | |
1439 | ||
1440 | /* Increase asoc's rwnd by len and send any window update SACK if needed. */ | |
95c96174 | 1441 | void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned int len) |
1da177e4 LT |
1442 | { |
1443 | struct sctp_chunk *sack; | |
1444 | struct timer_list *timer; | |
1445 | ||
1446 | if (asoc->rwnd_over) { | |
1447 | if (asoc->rwnd_over >= len) { | |
1448 | asoc->rwnd_over -= len; | |
1449 | } else { | |
1450 | asoc->rwnd += (len - asoc->rwnd_over); | |
1451 | asoc->rwnd_over = 0; | |
1452 | } | |
1453 | } else { | |
1454 | asoc->rwnd += len; | |
1455 | } | |
1456 | ||
4d3c46e6 VY |
1457 | /* If we had window pressure, start recovering it |
1458 | * once our rwnd had reached the accumulated pressure | |
1459 | * threshold. The idea is to recover slowly, but up | |
1460 | * to the initial advertised window. | |
1461 | */ | |
1462 | if (asoc->rwnd_press && asoc->rwnd >= asoc->rwnd_press) { | |
1463 | int change = min(asoc->pathmtu, asoc->rwnd_press); | |
1464 | asoc->rwnd += change; | |
1465 | asoc->rwnd_press -= change; | |
1466 | } | |
1467 | ||
1da177e4 | 1468 | SCTP_DEBUG_PRINTK("%s: asoc %p rwnd increased by %d to (%u, %u) " |
0dc47877 | 1469 | "- %u\n", __func__, asoc, len, asoc->rwnd, |
1da177e4 LT |
1470 | asoc->rwnd_over, asoc->a_rwnd); |
1471 | ||
1472 | /* Send a window update SACK if the rwnd has increased by at least the | |
1473 | * minimum of the association's PMTU and half of the receive buffer. | |
1474 | * The algorithm used is similar to the one described in | |
1475 | * Section 4.2.3.3 of RFC 1122. | |
1476 | */ | |
1477 | if (sctp_peer_needs_update(asoc)) { | |
1478 | asoc->a_rwnd = asoc->rwnd; | |
1479 | SCTP_DEBUG_PRINTK("%s: Sending window update SACK- asoc: %p " | |
0dc47877 | 1480 | "rwnd: %u a_rwnd: %u\n", __func__, |
1da177e4 LT |
1481 | asoc, asoc->rwnd, asoc->a_rwnd); |
1482 | sack = sctp_make_sack(asoc); | |
1483 | if (!sack) | |
1484 | return; | |
1485 | ||
1486 | asoc->peer.sack_needed = 0; | |
1487 | ||
1488 | sctp_outq_tail(&asoc->outqueue, sack); | |
1489 | ||
1490 | /* Stop the SACK timer. */ | |
1491 | timer = &asoc->timers[SCTP_EVENT_TIMEOUT_SACK]; | |
25cc4ae9 | 1492 | if (del_timer(timer)) |
1da177e4 LT |
1493 | sctp_association_put(asoc); |
1494 | } | |
1495 | } | |
1496 | ||
1497 | /* Decrease asoc's rwnd by len. */ | |
95c96174 | 1498 | void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned int len) |
1da177e4 | 1499 | { |
4d3c46e6 VY |
1500 | int rx_count; |
1501 | int over = 0; | |
1502 | ||
1da177e4 LT |
1503 | SCTP_ASSERT(asoc->rwnd, "rwnd zero", return); |
1504 | SCTP_ASSERT(!asoc->rwnd_over, "rwnd_over not zero", return); | |
4d3c46e6 VY |
1505 | |
1506 | if (asoc->ep->rcvbuf_policy) | |
1507 | rx_count = atomic_read(&asoc->rmem_alloc); | |
1508 | else | |
1509 | rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc); | |
1510 | ||
1511 | /* If we've reached or overflowed our receive buffer, announce | |
1512 | * a 0 rwnd if rwnd would still be positive. Store the | |
1513 | * the pottential pressure overflow so that the window can be restored | |
1514 | * back to original value. | |
1515 | */ | |
1516 | if (rx_count >= asoc->base.sk->sk_rcvbuf) | |
1517 | over = 1; | |
1518 | ||
1da177e4 LT |
1519 | if (asoc->rwnd >= len) { |
1520 | asoc->rwnd -= len; | |
4d3c46e6 | 1521 | if (over) { |
65883371 | 1522 | asoc->rwnd_press += asoc->rwnd; |
4d3c46e6 VY |
1523 | asoc->rwnd = 0; |
1524 | } | |
1da177e4 LT |
1525 | } else { |
1526 | asoc->rwnd_over = len - asoc->rwnd; | |
1527 | asoc->rwnd = 0; | |
1528 | } | |
4d3c46e6 | 1529 | SCTP_DEBUG_PRINTK("%s: asoc %p rwnd decreased by %d to (%u, %u, %u)\n", |
0dc47877 | 1530 | __func__, asoc, len, asoc->rwnd, |
4d3c46e6 | 1531 | asoc->rwnd_over, asoc->rwnd_press); |
1da177e4 LT |
1532 | } |
1533 | ||
1534 | /* Build the bind address list for the association based on info from the | |
1535 | * local endpoint and the remote peer. | |
1536 | */ | |
3182cd84 | 1537 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, |
409b95af | 1538 | sctp_scope_t scope, gfp_t gfp) |
1da177e4 | 1539 | { |
1da177e4 LT |
1540 | int flags; |
1541 | ||
1542 | /* Use scoping rules to determine the subset of addresses from | |
1543 | * the endpoint. | |
1544 | */ | |
1da177e4 LT |
1545 | flags = (PF_INET6 == asoc->base.sk->sk_family) ? SCTP_ADDR6_ALLOWED : 0; |
1546 | if (asoc->peer.ipv4_address) | |
1547 | flags |= SCTP_ADDR4_PEERSUPP; | |
1548 | if (asoc->peer.ipv6_address) | |
1549 | flags |= SCTP_ADDR6_PEERSUPP; | |
1550 | ||
4db67e80 EB |
1551 | return sctp_bind_addr_copy(sock_net(asoc->base.sk), |
1552 | &asoc->base.bind_addr, | |
1da177e4 LT |
1553 | &asoc->ep->base.bind_addr, |
1554 | scope, gfp, flags); | |
1555 | } | |
1556 | ||
1557 | /* Build the association's bind address list from the cookie. */ | |
1558 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *asoc, | |
3182cd84 | 1559 | struct sctp_cookie *cookie, |
dd0fc66f | 1560 | gfp_t gfp) |
1da177e4 LT |
1561 | { |
1562 | int var_size2 = ntohs(cookie->peer_init->chunk_hdr.length); | |
1563 | int var_size3 = cookie->raw_addr_list_len; | |
1564 | __u8 *raw = (__u8 *)cookie->peer_init + var_size2; | |
1565 | ||
1566 | return sctp_raw_to_bind_addrs(&asoc->base.bind_addr, raw, var_size3, | |
1567 | asoc->ep->base.bind_addr.port, gfp); | |
1568 | } | |
1569 | ||
d808ad9a YH |
1570 | /* Lookup laddr in the bind address list of an association. */ |
1571 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, | |
1da177e4 LT |
1572 | const union sctp_addr *laddr) |
1573 | { | |
559cf710 | 1574 | int found = 0; |
1da177e4 | 1575 | |
1da177e4 LT |
1576 | if ((asoc->base.bind_addr.port == ntohs(laddr->v4.sin_port)) && |
1577 | sctp_bind_addr_match(&asoc->base.bind_addr, laddr, | |
559cf710 | 1578 | sctp_sk(asoc->base.sk))) |
1da177e4 | 1579 | found = 1; |
1da177e4 | 1580 | |
1da177e4 LT |
1581 | return found; |
1582 | } | |
07d93967 VY |
1583 | |
1584 | /* Set an association id for a given association */ | |
1585 | int sctp_assoc_set_id(struct sctp_association *asoc, gfp_t gfp) | |
1586 | { | |
94960e8c TH |
1587 | bool preload = gfp & __GFP_WAIT; |
1588 | int ret; | |
c6ba68a2 VY |
1589 | |
1590 | /* If the id is already assigned, keep it. */ | |
1591 | if (asoc->assoc_id) | |
94960e8c | 1592 | return 0; |
07d93967 | 1593 | |
94960e8c TH |
1594 | if (preload) |
1595 | idr_preload(gfp); | |
07d93967 | 1596 | spin_lock_bh(&sctp_assocs_id_lock); |
713e00a3 JL |
1597 | /* 0 is not a valid assoc_id, must be >= 1 */ |
1598 | ret = idr_alloc_cyclic(&sctp_assocs_id, asoc, 1, 0, GFP_NOWAIT); | |
07d93967 | 1599 | spin_unlock_bh(&sctp_assocs_id_lock); |
94960e8c TH |
1600 | if (preload) |
1601 | idr_preload_end(); | |
1602 | if (ret < 0) | |
1603 | return ret; | |
07d93967 | 1604 | |
94960e8c TH |
1605 | asoc->assoc_id = (sctp_assoc_t)ret; |
1606 | return 0; | |
07d93967 | 1607 | } |
a08de64d | 1608 | |
8b4472cc WY |
1609 | /* Free the ASCONF queue */ |
1610 | static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc) | |
1611 | { | |
1612 | struct sctp_chunk *asconf; | |
1613 | struct sctp_chunk *tmp; | |
1614 | ||
1615 | list_for_each_entry_safe(asconf, tmp, &asoc->addip_chunk_list, list) { | |
1616 | list_del_init(&asconf->list); | |
1617 | sctp_chunk_free(asconf); | |
1618 | } | |
1619 | } | |
1620 | ||
a08de64d VY |
1621 | /* Free asconf_ack cache */ |
1622 | static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc) | |
1623 | { | |
1624 | struct sctp_chunk *ack; | |
1625 | struct sctp_chunk *tmp; | |
1626 | ||
1627 | list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list, | |
1628 | transmitted_list) { | |
1629 | list_del_init(&ack->transmitted_list); | |
1630 | sctp_chunk_free(ack); | |
1631 | } | |
1632 | } | |
1633 | ||
1634 | /* Clean up the ASCONF_ACK queue */ | |
1635 | void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc) | |
1636 | { | |
1637 | struct sctp_chunk *ack; | |
1638 | struct sctp_chunk *tmp; | |
1639 | ||
25985edc | 1640 | /* We can remove all the entries from the queue up to |
a08de64d VY |
1641 | * the "Peer-Sequence-Number". |
1642 | */ | |
1643 | list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list, | |
1644 | transmitted_list) { | |
1645 | if (ack->subh.addip_hdr->serial == | |
1646 | htonl(asoc->peer.addip_serial)) | |
1647 | break; | |
1648 | ||
1649 | list_del_init(&ack->transmitted_list); | |
1650 | sctp_chunk_free(ack); | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | /* Find the ASCONF_ACK whose serial number matches ASCONF */ | |
1655 | struct sctp_chunk *sctp_assoc_lookup_asconf_ack( | |
1656 | const struct sctp_association *asoc, | |
1657 | __be32 serial) | |
1658 | { | |
a8699814 | 1659 | struct sctp_chunk *ack; |
a08de64d VY |
1660 | |
1661 | /* Walk through the list of cached ASCONF-ACKs and find the | |
1662 | * ack chunk whose serial number matches that of the request. | |
1663 | */ | |
1664 | list_for_each_entry(ack, &asoc->asconf_ack_list, transmitted_list) { | |
1665 | if (ack->subh.addip_hdr->serial == serial) { | |
1666 | sctp_chunk_hold(ack); | |
a8699814 | 1667 | return ack; |
a08de64d VY |
1668 | } |
1669 | } | |
1670 | ||
a8699814 | 1671 | return NULL; |
a08de64d | 1672 | } |
a000c01e WY |
1673 | |
1674 | void sctp_asconf_queue_teardown(struct sctp_association *asoc) | |
1675 | { | |
1676 | /* Free any cached ASCONF_ACK chunk. */ | |
1677 | sctp_assoc_free_asconf_acks(asoc); | |
1678 | ||
1679 | /* Free the ASCONF queue. */ | |
1680 | sctp_assoc_free_asconf_queue(asoc); | |
1681 | ||
1682 | /* Free any cached ASCONF chunk. */ | |
1683 | if (asoc->addip_last_asconf) | |
1684 | sctp_chunk_free(asoc->addip_last_asconf); | |
1685 | } |