Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* SCTP kernel reference Implementation |
| 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 | * |
| 8 | * This file is part of the SCTP kernel reference Implementation |
| 9 | * |
| 10 | * This module provides the abstraction for an SCTP association. |
| 11 | * |
| 12 | * The SCTP reference implementation is free software; |
| 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 | * |
| 18 | * The SCTP reference implementation is distributed in the hope that it |
| 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 | |
| 51 | #include <linux/types.h> |
| 52 | #include <linux/fcntl.h> |
| 53 | #include <linux/poll.h> |
| 54 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | #include <linux/slab.h> |
| 57 | #include <linux/in.h> |
| 58 | #include <net/ipv6.h> |
| 59 | #include <net/sctp/sctp.h> |
| 60 | #include <net/sctp/sm.h> |
| 61 | |
| 62 | /* Forward declarations for internal functions. */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 63 | static void sctp_assoc_bh_rcv(struct work_struct *work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
| 65 | |
| 66 | /* 1st Level Abstractions. */ |
| 67 | |
| 68 | /* Initialize a new association from provided memory. */ |
| 69 | static struct sctp_association *sctp_association_init(struct sctp_association *asoc, |
| 70 | const struct sctp_endpoint *ep, |
| 71 | const struct sock *sk, |
| 72 | sctp_scope_t scope, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 73 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | { |
| 75 | struct sctp_sock *sp; |
| 76 | int i; |
| 77 | |
| 78 | /* Retrieve the SCTP per socket area. */ |
| 79 | sp = sctp_sk((struct sock *)sk); |
| 80 | |
| 81 | /* Init all variables to a known value. */ |
| 82 | memset(asoc, 0, sizeof(struct sctp_association)); |
| 83 | |
| 84 | /* Discarding const is appropriate here. */ |
| 85 | asoc->ep = (struct sctp_endpoint *)ep; |
| 86 | sctp_endpoint_hold(asoc->ep); |
| 87 | |
| 88 | /* Hold the sock. */ |
| 89 | asoc->base.sk = (struct sock *)sk; |
| 90 | sock_hold(asoc->base.sk); |
| 91 | |
| 92 | /* Initialize the common base substructure. */ |
| 93 | asoc->base.type = SCTP_EP_TYPE_ASSOCIATION; |
| 94 | |
| 95 | /* Initialize the object handling fields. */ |
| 96 | atomic_set(&asoc->base.refcnt, 1); |
| 97 | asoc->base.dead = 0; |
| 98 | asoc->base.malloced = 0; |
| 99 | |
| 100 | /* Initialize the bind addr area. */ |
| 101 | sctp_bind_addr_init(&asoc->base.bind_addr, ep->base.bind_addr.port); |
| 102 | rwlock_init(&asoc->base.addr_lock); |
| 103 | |
| 104 | asoc->state = SCTP_STATE_CLOSED; |
| 105 | |
| 106 | /* Set these values from the socket values, a conversion between |
| 107 | * millsecons to seconds/microseconds must also be done. |
| 108 | */ |
| 109 | asoc->cookie_life.tv_sec = sp->assocparams.sasoc_cookie_life / 1000; |
| 110 | asoc->cookie_life.tv_usec = (sp->assocparams.sasoc_cookie_life % 1000) |
| 111 | * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | asoc->frag_point = 0; |
| 113 | |
| 114 | /* Set the association max_retrans and RTO values from the |
| 115 | * socket values. |
| 116 | */ |
| 117 | asoc->max_retrans = sp->assocparams.sasoc_asocmaxrxt; |
| 118 | asoc->rto_initial = msecs_to_jiffies(sp->rtoinfo.srto_initial); |
| 119 | asoc->rto_max = msecs_to_jiffies(sp->rtoinfo.srto_max); |
| 120 | asoc->rto_min = msecs_to_jiffies(sp->rtoinfo.srto_min); |
| 121 | |
| 122 | asoc->overall_error_count = 0; |
| 123 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 124 | /* Initialize the association's heartbeat interval based on the |
| 125 | * sock configured value. |
| 126 | */ |
| 127 | asoc->hbinterval = msecs_to_jiffies(sp->hbinterval); |
| 128 | |
| 129 | /* Initialize path max retrans value. */ |
| 130 | asoc->pathmaxrxt = sp->pathmaxrxt; |
| 131 | |
| 132 | /* Initialize default path MTU. */ |
| 133 | asoc->pathmtu = sp->pathmtu; |
| 134 | |
| 135 | /* Set association default SACK delay */ |
| 136 | asoc->sackdelay = msecs_to_jiffies(sp->sackdelay); |
| 137 | |
| 138 | /* Set the association default flags controlling |
| 139 | * Heartbeat, SACK delay, and Path MTU Discovery. |
| 140 | */ |
| 141 | asoc->param_flags = sp->param_flags; |
| 142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | /* Initialize the maximum mumber of new data packets that can be sent |
| 144 | * in a burst. |
| 145 | */ |
| 146 | asoc->max_burst = sctp_max_burst; |
| 147 | |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 148 | /* initialize association timers */ |
| 149 | asoc->timeouts[SCTP_EVENT_TIMEOUT_NONE] = 0; |
| 150 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = asoc->rto_initial; |
| 151 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = asoc->rto_initial; |
| 152 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = asoc->rto_initial; |
| 153 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] = 0; |
| 154 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = 0; |
| 155 | |
| 156 | /* sctpimpguide Section 2.12.2 |
| 157 | * If the 'T5-shutdown-guard' timer is used, it SHOULD be set to the |
| 158 | * recommended value of 5 times 'RTO.Max'. |
| 159 | */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 160 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD] |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 161 | = 5 * asoc->rto_max; |
| 162 | |
| 163 | asoc->timeouts[SCTP_EVENT_TIMEOUT_HEARTBEAT] = 0; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 164 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = asoc->sackdelay; |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 165 | asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] = |
| 166 | sp->autoclose * HZ; |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 167 | |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 168 | /* Initilizes the timers */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | init_timer(&asoc->timers[i]); |
| 171 | asoc->timers[i].function = sctp_timer_events[i]; |
| 172 | asoc->timers[i].data = (unsigned long) asoc; |
| 173 | } |
| 174 | |
| 175 | /* Pull default initialization values from the sock options. |
| 176 | * Note: This assumes that the values have already been |
| 177 | * validated in the sock. |
| 178 | */ |
| 179 | asoc->c.sinit_max_instreams = sp->initmsg.sinit_max_instreams; |
| 180 | asoc->c.sinit_num_ostreams = sp->initmsg.sinit_num_ostreams; |
| 181 | asoc->max_init_attempts = sp->initmsg.sinit_max_attempts; |
| 182 | |
| 183 | asoc->max_init_timeo = |
| 184 | msecs_to_jiffies(sp->initmsg.sinit_max_init_timeo); |
| 185 | |
| 186 | /* Allocate storage for the ssnmap after the inbound and outbound |
| 187 | * streams have been negotiated during Init. |
| 188 | */ |
| 189 | asoc->ssnmap = NULL; |
| 190 | |
| 191 | /* Set the local window size for receive. |
| 192 | * This is also the rcvbuf space per association. |
| 193 | * RFC 6 - A SCTP receiver MUST be able to receive a minimum of |
| 194 | * 1500 bytes in one SCTP packet. |
| 195 | */ |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 196 | if ((sk->sk_rcvbuf/2) < SCTP_DEFAULT_MINWINDOW) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | asoc->rwnd = SCTP_DEFAULT_MINWINDOW; |
| 198 | else |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 199 | asoc->rwnd = sk->sk_rcvbuf/2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
| 201 | asoc->a_rwnd = asoc->rwnd; |
| 202 | |
| 203 | asoc->rwnd_over = 0; |
| 204 | |
| 205 | /* Use my own max window until I learn something better. */ |
| 206 | asoc->peer.rwnd = SCTP_DEFAULT_MAXWINDOW; |
| 207 | |
| 208 | /* Set the sndbuf size for transmit. */ |
| 209 | asoc->sndbuf_used = 0; |
| 210 | |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 211 | /* Initialize the receive memory counter */ |
| 212 | atomic_set(&asoc->rmem_alloc, 0); |
| 213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | init_waitqueue_head(&asoc->wait); |
| 215 | |
| 216 | asoc->c.my_vtag = sctp_generate_tag(ep); |
| 217 | asoc->peer.i.init_tag = 0; /* INIT needs a vtag of 0. */ |
| 218 | asoc->c.peer_vtag = 0; |
| 219 | asoc->c.my_ttag = 0; |
| 220 | asoc->c.peer_ttag = 0; |
| 221 | asoc->c.my_port = ep->base.bind_addr.port; |
| 222 | |
| 223 | asoc->c.initial_tsn = sctp_generate_tsn(ep); |
| 224 | |
| 225 | asoc->next_tsn = asoc->c.initial_tsn; |
| 226 | |
| 227 | asoc->ctsn_ack_point = asoc->next_tsn - 1; |
| 228 | asoc->adv_peer_ack_point = asoc->ctsn_ack_point; |
| 229 | asoc->highest_sacked = asoc->ctsn_ack_point; |
| 230 | asoc->last_cwr_tsn = asoc->ctsn_ack_point; |
| 231 | asoc->unack_data = 0; |
| 232 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | /* ADDIP Section 4.1 Asconf Chunk Procedures |
| 234 | * |
| 235 | * When an endpoint has an ASCONF signaled change to be sent to the |
| 236 | * remote endpoint it should do the following: |
| 237 | * ... |
| 238 | * A2) a serial number should be assigned to the chunk. The serial |
| 239 | * number SHOULD be a monotonically increasing number. The serial |
| 240 | * numbers SHOULD be initialized at the start of the |
| 241 | * association to the same value as the initial TSN. |
| 242 | */ |
| 243 | asoc->addip_serial = asoc->c.initial_tsn; |
| 244 | |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 245 | INIT_LIST_HEAD(&asoc->addip_chunk_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
| 247 | /* Make an empty list of remote transport addresses. */ |
| 248 | INIT_LIST_HEAD(&asoc->peer.transport_addr_list); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 249 | asoc->peer.transport_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
| 251 | /* RFC 2960 5.1 Normal Establishment of an Association |
| 252 | * |
| 253 | * After the reception of the first data chunk in an |
| 254 | * association the endpoint must immediately respond with a |
| 255 | * sack to acknowledge the data chunk. Subsequent |
| 256 | * acknowledgements should be done as described in Section |
| 257 | * 6.2. |
| 258 | * |
| 259 | * [We implement this by telling a new association that it |
| 260 | * already received one packet.] |
| 261 | */ |
| 262 | asoc->peer.sack_needed = 1; |
| 263 | |
| 264 | /* Assume that the peer recongizes ASCONF until reported otherwise |
| 265 | * via an ERROR chunk. |
| 266 | */ |
| 267 | asoc->peer.asconf_capable = 1; |
| 268 | |
| 269 | /* Create an input queue. */ |
| 270 | sctp_inq_init(&asoc->base.inqueue); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 271 | sctp_inq_set_th_handler(&asoc->base.inqueue, sctp_assoc_bh_rcv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | /* Create an output queue. */ |
| 274 | sctp_outq_init(asoc, &asoc->outqueue); |
| 275 | |
| 276 | if (!sctp_ulpq_init(&asoc->ulpq, asoc)) |
| 277 | goto fail_init; |
| 278 | |
| 279 | /* Set up the tsn tracking. */ |
| 280 | sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE, 0); |
| 281 | |
| 282 | asoc->need_ecne = 0; |
| 283 | |
| 284 | asoc->assoc_id = 0; |
| 285 | |
| 286 | /* Assume that peer would support both address types unless we are |
| 287 | * told otherwise. |
| 288 | */ |
| 289 | asoc->peer.ipv4_address = 1; |
| 290 | asoc->peer.ipv6_address = 1; |
| 291 | INIT_LIST_HEAD(&asoc->asocs); |
| 292 | |
| 293 | asoc->autoclose = sp->autoclose; |
| 294 | |
| 295 | asoc->default_stream = sp->default_stream; |
| 296 | asoc->default_ppid = sp->default_ppid; |
| 297 | asoc->default_flags = sp->default_flags; |
| 298 | asoc->default_context = sp->default_context; |
| 299 | asoc->default_timetolive = sp->default_timetolive; |
Ivan Skytte Jorgensen | 6ab792f | 2006-12-13 16:34:22 -0800 | [diff] [blame] | 300 | asoc->default_rcv_context = sp->default_rcv_context; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
| 302 | return asoc; |
| 303 | |
| 304 | fail_init: |
| 305 | sctp_endpoint_put(asoc->ep); |
| 306 | sock_put(asoc->base.sk); |
| 307 | return NULL; |
| 308 | } |
| 309 | |
| 310 | /* Allocate and initialize a new association */ |
| 311 | struct sctp_association *sctp_association_new(const struct sctp_endpoint *ep, |
| 312 | const struct sock *sk, |
Alexey Dobriyan | 3182cd84 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 313 | sctp_scope_t scope, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 314 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | { |
| 316 | struct sctp_association *asoc; |
| 317 | |
| 318 | asoc = t_new(struct sctp_association, gfp); |
| 319 | if (!asoc) |
| 320 | goto fail; |
| 321 | |
| 322 | if (!sctp_association_init(asoc, ep, sk, scope, gfp)) |
| 323 | goto fail_init; |
| 324 | |
| 325 | asoc->base.malloced = 1; |
| 326 | SCTP_DBG_OBJCNT_INC(assoc); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 327 | SCTP_DEBUG_PRINTK("Created asoc %p\n", asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
| 329 | return asoc; |
| 330 | |
| 331 | fail_init: |
| 332 | kfree(asoc); |
| 333 | fail: |
| 334 | return NULL; |
| 335 | } |
| 336 | |
| 337 | /* Free this association if possible. There may still be users, so |
| 338 | * the actual deallocation may be delayed. |
| 339 | */ |
| 340 | void sctp_association_free(struct sctp_association *asoc) |
| 341 | { |
| 342 | struct sock *sk = asoc->base.sk; |
| 343 | struct sctp_transport *transport; |
| 344 | struct list_head *pos, *temp; |
| 345 | int i; |
| 346 | |
Vlad Yasevich | de76e69 | 2006-10-30 18:55:11 -0800 | [diff] [blame] | 347 | /* Only real associations count against the endpoint, so |
| 348 | * don't bother for if this is a temporary association. |
| 349 | */ |
| 350 | if (!asoc->temp) { |
| 351 | list_del(&asoc->asocs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
Vlad Yasevich | de76e69 | 2006-10-30 18:55:11 -0800 | [diff] [blame] | 353 | /* Decrement the backlog value for a TCP-style listening |
| 354 | * socket. |
| 355 | */ |
| 356 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) |
| 357 | sk->sk_ack_backlog--; |
| 358 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
| 360 | /* Mark as dead, so other users can know this structure is |
| 361 | * going away. |
| 362 | */ |
| 363 | asoc->base.dead = 1; |
| 364 | |
| 365 | /* Dispose of any data lying around in the outqueue. */ |
| 366 | sctp_outq_free(&asoc->outqueue); |
| 367 | |
| 368 | /* Dispose of any pending messages for the upper layer. */ |
| 369 | sctp_ulpq_free(&asoc->ulpq); |
| 370 | |
| 371 | /* Dispose of any pending chunks on the inqueue. */ |
| 372 | sctp_inq_free(&asoc->base.inqueue); |
| 373 | |
| 374 | /* Free ssnmap storage. */ |
| 375 | sctp_ssnmap_free(asoc->ssnmap); |
| 376 | |
| 377 | /* Clean up the bound address list. */ |
| 378 | sctp_bind_addr_free(&asoc->base.bind_addr); |
| 379 | |
| 380 | /* Do we need to go through all of our timers and |
| 381 | * delete them? To be safe we will try to delete all, but we |
| 382 | * should be able to go through and make a guess based |
| 383 | * on our state. |
| 384 | */ |
| 385 | for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) { |
| 386 | if (timer_pending(&asoc->timers[i]) && |
| 387 | del_timer(&asoc->timers[i])) |
| 388 | sctp_association_put(asoc); |
| 389 | } |
| 390 | |
| 391 | /* Free peer's cached cookie. */ |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 392 | kfree(asoc->peer.cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
| 394 | /* Release the transport structures. */ |
| 395 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 396 | transport = list_entry(pos, struct sctp_transport, transports); |
| 397 | list_del(pos); |
| 398 | sctp_transport_free(transport); |
| 399 | } |
| 400 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 401 | asoc->peer.transport_count = 0; |
| 402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | /* Free any cached ASCONF_ACK chunk. */ |
| 404 | if (asoc->addip_last_asconf_ack) |
| 405 | sctp_chunk_free(asoc->addip_last_asconf_ack); |
| 406 | |
| 407 | /* Free any cached ASCONF chunk. */ |
| 408 | if (asoc->addip_last_asconf) |
| 409 | sctp_chunk_free(asoc->addip_last_asconf); |
| 410 | |
| 411 | sctp_association_put(asoc); |
| 412 | } |
| 413 | |
| 414 | /* Cleanup and free up an association. */ |
| 415 | static void sctp_association_destroy(struct sctp_association *asoc) |
| 416 | { |
| 417 | SCTP_ASSERT(asoc->base.dead, "Assoc is not dead", return); |
| 418 | |
| 419 | sctp_endpoint_put(asoc->ep); |
| 420 | sock_put(asoc->base.sk); |
| 421 | |
| 422 | if (asoc->assoc_id != 0) { |
| 423 | spin_lock_bh(&sctp_assocs_id_lock); |
| 424 | idr_remove(&sctp_assocs_id, asoc->assoc_id); |
| 425 | spin_unlock_bh(&sctp_assocs_id_lock); |
| 426 | } |
| 427 | |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 428 | BUG_TRAP(!atomic_read(&asoc->rmem_alloc)); |
| 429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | if (asoc->base.malloced) { |
| 431 | kfree(asoc); |
| 432 | SCTP_DBG_OBJCNT_DEC(assoc); |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | /* Change the primary destination address for the peer. */ |
| 437 | void sctp_assoc_set_primary(struct sctp_association *asoc, |
| 438 | struct sctp_transport *transport) |
| 439 | { |
| 440 | asoc->peer.primary_path = transport; |
| 441 | |
| 442 | /* Set a default msg_name for events. */ |
| 443 | memcpy(&asoc->peer.primary_addr, &transport->ipaddr, |
| 444 | sizeof(union sctp_addr)); |
| 445 | |
| 446 | /* If the primary path is changing, assume that the |
| 447 | * user wants to use this new path. |
| 448 | */ |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 449 | if ((transport->state == SCTP_ACTIVE) || |
| 450 | (transport->state == SCTP_UNKNOWN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | asoc->peer.active_path = transport; |
| 452 | |
| 453 | /* |
| 454 | * SFR-CACC algorithm: |
| 455 | * Upon the receipt of a request to change the primary |
| 456 | * destination address, on the data structure for the new |
| 457 | * primary destination, the sender MUST do the following: |
| 458 | * |
| 459 | * 1) If CHANGEOVER_ACTIVE is set, then there was a switch |
| 460 | * to this destination address earlier. The sender MUST set |
| 461 | * CYCLING_CHANGEOVER to indicate that this switch is a |
| 462 | * double switch to the same destination address. |
| 463 | */ |
| 464 | if (transport->cacc.changeover_active) |
| 465 | transport->cacc.cycling_changeover = 1; |
| 466 | |
| 467 | /* 2) The sender MUST set CHANGEOVER_ACTIVE to indicate that |
| 468 | * a changeover has occurred. |
| 469 | */ |
| 470 | transport->cacc.changeover_active = 1; |
| 471 | |
| 472 | /* 3) The sender MUST store the next TSN to be sent in |
| 473 | * next_tsn_at_change. |
| 474 | */ |
| 475 | transport->cacc.next_tsn_at_change = asoc->next_tsn; |
| 476 | } |
| 477 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 478 | /* Remove a transport from an association. */ |
| 479 | void sctp_assoc_rm_peer(struct sctp_association *asoc, |
| 480 | struct sctp_transport *peer) |
| 481 | { |
| 482 | struct list_head *pos; |
| 483 | struct sctp_transport *transport; |
| 484 | |
| 485 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_rm_peer:association %p addr: ", |
| 486 | " port: %d\n", |
| 487 | asoc, |
| 488 | (&peer->ipaddr), |
Al Viro | b3f5b3b | 2006-11-20 17:22:43 -0800 | [diff] [blame] | 489 | ntohs(peer->ipaddr.v4.sin_port)); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 490 | |
| 491 | /* If we are to remove the current retran_path, update it |
| 492 | * to the next peer before removing this peer from the list. |
| 493 | */ |
| 494 | if (asoc->peer.retran_path == peer) |
| 495 | sctp_assoc_update_retran_path(asoc); |
| 496 | |
| 497 | /* Remove this peer from the list. */ |
| 498 | list_del(&peer->transports); |
| 499 | |
| 500 | /* Get the first transport of asoc. */ |
| 501 | pos = asoc->peer.transport_addr_list.next; |
| 502 | transport = list_entry(pos, struct sctp_transport, transports); |
| 503 | |
| 504 | /* Update any entries that match the peer to be deleted. */ |
| 505 | if (asoc->peer.primary_path == peer) |
| 506 | sctp_assoc_set_primary(asoc, transport); |
| 507 | if (asoc->peer.active_path == peer) |
| 508 | asoc->peer.active_path = transport; |
| 509 | if (asoc->peer.last_data_from == peer) |
| 510 | asoc->peer.last_data_from = transport; |
| 511 | |
| 512 | /* If we remove the transport an INIT was last sent to, set it to |
| 513 | * NULL. Combined with the update of the retran path above, this |
| 514 | * will cause the next INIT to be sent to the next available |
| 515 | * transport, maintaining the cycle. |
| 516 | */ |
| 517 | if (asoc->init_last_sent_to == peer) |
| 518 | asoc->init_last_sent_to = NULL; |
| 519 | |
| 520 | asoc->peer.transport_count--; |
| 521 | |
| 522 | sctp_transport_free(peer); |
| 523 | } |
| 524 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | /* Add a transport address to an association. */ |
| 526 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, |
| 527 | const union sctp_addr *addr, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 528 | const gfp_t gfp, |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 529 | const int peer_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | { |
| 531 | struct sctp_transport *peer; |
| 532 | struct sctp_sock *sp; |
| 533 | unsigned short port; |
| 534 | |
| 535 | sp = sctp_sk(asoc->base.sk); |
| 536 | |
| 537 | /* AF_INET and AF_INET6 share common port field. */ |
Al Viro | 4bdf4b5 | 2006-11-20 17:10:20 -0800 | [diff] [blame] | 538 | port = ntohs(addr->v4.sin_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 540 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_add_peer:association %p addr: ", |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 541 | " port: %d state:%d\n", |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 542 | asoc, |
| 543 | addr, |
Al Viro | 4bdf4b5 | 2006-11-20 17:10:20 -0800 | [diff] [blame] | 544 | port, |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 545 | peer_state); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 546 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | /* Set the port if it has not been set yet. */ |
| 548 | if (0 == asoc->peer.port) |
| 549 | asoc->peer.port = port; |
| 550 | |
| 551 | /* Check to see if this is a duplicate. */ |
| 552 | peer = sctp_assoc_lookup_paddr(asoc, addr); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 553 | if (peer) { |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 554 | if (peer->state == SCTP_UNKNOWN) { |
| 555 | if (peer_state == SCTP_ACTIVE) |
| 556 | peer->state = SCTP_ACTIVE; |
| 557 | if (peer_state == SCTP_UNCONFIRMED) |
| 558 | peer->state = SCTP_UNCONFIRMED; |
| 559 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | return peer; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 561 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
| 563 | peer = sctp_transport_new(addr, gfp); |
| 564 | if (!peer) |
| 565 | return NULL; |
| 566 | |
| 567 | sctp_transport_set_owner(peer, asoc); |
| 568 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 569 | /* Initialize the peer's heartbeat interval based on the |
| 570 | * association configured value. |
| 571 | */ |
| 572 | peer->hbinterval = asoc->hbinterval; |
| 573 | |
| 574 | /* Set the path max_retrans. */ |
| 575 | peer->pathmaxrxt = asoc->pathmaxrxt; |
| 576 | |
| 577 | /* Initialize the peer's SACK delay timeout based on the |
| 578 | * association configured value. |
| 579 | */ |
| 580 | peer->sackdelay = asoc->sackdelay; |
| 581 | |
| 582 | /* Enable/disable heartbeat, SACK delay, and path MTU discovery |
| 583 | * based on association setting. |
| 584 | */ |
| 585 | peer->param_flags = asoc->param_flags; |
| 586 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | /* Initialize the pmtu of the transport. */ |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 588 | if (peer->param_flags & SPP_PMTUD_ENABLE) |
| 589 | sctp_transport_pmtu(peer); |
| 590 | else if (asoc->pathmtu) |
| 591 | peer->pathmtu = asoc->pathmtu; |
| 592 | else |
| 593 | peer->pathmtu = SCTP_DEFAULT_MAXSEGMENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
| 595 | /* If this is the first transport addr on this association, |
| 596 | * initialize the association PMTU to the peer's PMTU. |
| 597 | * If not and the current association PMTU is higher than the new |
| 598 | * peer's PMTU, reset the association PMTU to the new peer's PMTU. |
| 599 | */ |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 600 | if (asoc->pathmtu) |
| 601 | asoc->pathmtu = min_t(int, peer->pathmtu, asoc->pathmtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | else |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 603 | asoc->pathmtu = peer->pathmtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
| 605 | SCTP_DEBUG_PRINTK("sctp_assoc_add_peer:association %p PMTU set to " |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 606 | "%d\n", asoc, asoc->pathmtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 608 | asoc->frag_point = sctp_frag_point(sp, asoc->pathmtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
| 610 | /* The asoc->peer.port might not be meaningful yet, but |
| 611 | * initialize the packet structure anyway. |
| 612 | */ |
| 613 | sctp_packet_init(&peer->packet, peer, asoc->base.bind_addr.port, |
| 614 | asoc->peer.port); |
| 615 | |
| 616 | /* 7.2.1 Slow-Start |
| 617 | * |
| 618 | * o The initial cwnd before DATA transmission or after a sufficiently |
| 619 | * long idle period MUST be set to |
| 620 | * min(4*MTU, max(2*MTU, 4380 bytes)) |
| 621 | * |
| 622 | * o The initial value of ssthresh MAY be arbitrarily high |
| 623 | * (for example, implementations MAY use the size of the |
| 624 | * receiver advertised window). |
| 625 | */ |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 626 | peer->cwnd = min(4*asoc->pathmtu, max_t(__u32, 2*asoc->pathmtu, 4380)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
| 628 | /* At this point, we may not have the receiver's advertised window, |
| 629 | * so initialize ssthresh to the default value and it will be set |
| 630 | * later when we process the INIT. |
| 631 | */ |
| 632 | peer->ssthresh = SCTP_DEFAULT_MAXWINDOW; |
| 633 | |
| 634 | peer->partial_bytes_acked = 0; |
| 635 | peer->flight_size = 0; |
| 636 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | /* Set the transport's RTO.initial value */ |
| 638 | peer->rto = asoc->rto_initial; |
| 639 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 640 | /* Set the peer's active state. */ |
| 641 | peer->state = peer_state; |
| 642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | /* Attach the remote transport to our asoc. */ |
| 644 | list_add_tail(&peer->transports, &asoc->peer.transport_addr_list); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 645 | asoc->peer.transport_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | |
| 647 | /* If we do not yet have a primary path, set one. */ |
| 648 | if (!asoc->peer.primary_path) { |
| 649 | sctp_assoc_set_primary(asoc, peer); |
| 650 | asoc->peer.retran_path = peer; |
| 651 | } |
| 652 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 653 | if (asoc->peer.active_path == asoc->peer.retran_path) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | asoc->peer.retran_path = peer; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 655 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
| 657 | return peer; |
| 658 | } |
| 659 | |
| 660 | /* Delete a transport address from an association. */ |
| 661 | void sctp_assoc_del_peer(struct sctp_association *asoc, |
| 662 | const union sctp_addr *addr) |
| 663 | { |
| 664 | struct list_head *pos; |
| 665 | struct list_head *temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | struct sctp_transport *transport; |
| 667 | |
| 668 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 669 | transport = list_entry(pos, struct sctp_transport, transports); |
| 670 | if (sctp_cmp_addr_exact(addr, &transport->ipaddr)) { |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 671 | /* Do book keeping for removing the peer and free it. */ |
| 672 | sctp_assoc_rm_peer(asoc, transport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | break; |
| 674 | } |
| 675 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
| 677 | |
| 678 | /* Lookup a transport by address. */ |
| 679 | struct sctp_transport *sctp_assoc_lookup_paddr( |
| 680 | const struct sctp_association *asoc, |
| 681 | const union sctp_addr *address) |
| 682 | { |
| 683 | struct sctp_transport *t; |
| 684 | struct list_head *pos; |
| 685 | |
| 686 | /* Cycle through all transports searching for a peer address. */ |
| 687 | |
| 688 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
| 689 | t = list_entry(pos, struct sctp_transport, transports); |
| 690 | if (sctp_cmp_addr_exact(address, &t->ipaddr)) |
| 691 | return t; |
| 692 | } |
| 693 | |
| 694 | return NULL; |
| 695 | } |
| 696 | |
| 697 | /* Engage in transport control operations. |
| 698 | * Mark the transport up or down and send a notification to the user. |
| 699 | * Select and update the new active and retran paths. |
| 700 | */ |
| 701 | void sctp_assoc_control_transport(struct sctp_association *asoc, |
| 702 | struct sctp_transport *transport, |
| 703 | sctp_transport_cmd_t command, |
| 704 | sctp_sn_error_t error) |
| 705 | { |
| 706 | struct sctp_transport *t = NULL; |
| 707 | struct sctp_transport *first; |
| 708 | struct sctp_transport *second; |
| 709 | struct sctp_ulpevent *event; |
Al Viro | 0906e20 | 2006-11-20 17:03:01 -0800 | [diff] [blame] | 710 | struct sockaddr_storage addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | struct list_head *pos; |
| 712 | int spc_state = 0; |
| 713 | |
| 714 | /* Record the transition on the transport. */ |
| 715 | switch (command) { |
| 716 | case SCTP_TRANSPORT_UP: |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 717 | transport->state = SCTP_ACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | spc_state = SCTP_ADDR_AVAILABLE; |
| 719 | break; |
| 720 | |
| 721 | case SCTP_TRANSPORT_DOWN: |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 722 | transport->state = SCTP_INACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | spc_state = SCTP_ADDR_UNREACHABLE; |
| 724 | break; |
| 725 | |
| 726 | default: |
| 727 | return; |
| 728 | }; |
| 729 | |
| 730 | /* Generate and send a SCTP_PEER_ADDR_CHANGE notification to the |
| 731 | * user. |
| 732 | */ |
Al Viro | 0906e20 | 2006-11-20 17:03:01 -0800 | [diff] [blame] | 733 | memset(&addr, 0, sizeof(struct sockaddr_storage)); |
Al Viro | 8cec6b8 | 2006-11-20 17:23:01 -0800 | [diff] [blame] | 734 | memcpy(&addr, &transport->ipaddr, transport->af_specific->sockaddr_len); |
Al Viro | 0906e20 | 2006-11-20 17:03:01 -0800 | [diff] [blame] | 735 | event = sctp_ulpevent_make_peer_addr_change(asoc, &addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | 0, spc_state, error, GFP_ATOMIC); |
| 737 | if (event) |
| 738 | sctp_ulpq_tail_event(&asoc->ulpq, event); |
| 739 | |
| 740 | /* Select new active and retran paths. */ |
| 741 | |
| 742 | /* Look for the two most recently used active transports. |
| 743 | * |
| 744 | * This code produces the wrong ordering whenever jiffies |
| 745 | * rolls over, but we still get usable transports, so we don't |
| 746 | * worry about it. |
| 747 | */ |
| 748 | first = NULL; second = NULL; |
| 749 | |
| 750 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
| 751 | t = list_entry(pos, struct sctp_transport, transports); |
| 752 | |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 753 | if ((t->state == SCTP_INACTIVE) || |
| 754 | (t->state == SCTP_UNCONFIRMED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | continue; |
| 756 | if (!first || t->last_time_heard > first->last_time_heard) { |
| 757 | second = first; |
| 758 | first = t; |
| 759 | } |
| 760 | if (!second || t->last_time_heard > second->last_time_heard) |
| 761 | second = t; |
| 762 | } |
| 763 | |
| 764 | /* RFC 2960 6.4 Multi-Homed SCTP Endpoints |
| 765 | * |
| 766 | * By default, an endpoint should always transmit to the |
| 767 | * primary path, unless the SCTP user explicitly specifies the |
| 768 | * destination transport address (and possibly source |
| 769 | * transport address) to use. |
| 770 | * |
| 771 | * [If the primary is active but not most recent, bump the most |
| 772 | * recently used transport.] |
| 773 | */ |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 774 | if (((asoc->peer.primary_path->state == SCTP_ACTIVE) || |
| 775 | (asoc->peer.primary_path->state == SCTP_UNKNOWN)) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | first != asoc->peer.primary_path) { |
| 777 | second = first; |
| 778 | first = asoc->peer.primary_path; |
| 779 | } |
| 780 | |
| 781 | /* If we failed to find a usable transport, just camp on the |
| 782 | * primary, even if it is inactive. |
| 783 | */ |
| 784 | if (!first) { |
| 785 | first = asoc->peer.primary_path; |
| 786 | second = asoc->peer.primary_path; |
| 787 | } |
| 788 | |
| 789 | /* Set the active and retran transports. */ |
| 790 | asoc->peer.active_path = first; |
| 791 | asoc->peer.retran_path = second; |
| 792 | } |
| 793 | |
| 794 | /* Hold a reference to an association. */ |
| 795 | void sctp_association_hold(struct sctp_association *asoc) |
| 796 | { |
| 797 | atomic_inc(&asoc->base.refcnt); |
| 798 | } |
| 799 | |
| 800 | /* Release a reference to an association and cleanup |
| 801 | * if there are no more references. |
| 802 | */ |
| 803 | void sctp_association_put(struct sctp_association *asoc) |
| 804 | { |
| 805 | if (atomic_dec_and_test(&asoc->base.refcnt)) |
| 806 | sctp_association_destroy(asoc); |
| 807 | } |
| 808 | |
| 809 | /* Allocate the next TSN, Transmission Sequence Number, for the given |
| 810 | * association. |
| 811 | */ |
| 812 | __u32 sctp_association_get_next_tsn(struct sctp_association *asoc) |
| 813 | { |
| 814 | /* From Section 1.6 Serial Number Arithmetic: |
| 815 | * Transmission Sequence Numbers wrap around when they reach |
| 816 | * 2**32 - 1. That is, the next TSN a DATA chunk MUST use |
| 817 | * after transmitting TSN = 2*32 - 1 is TSN = 0. |
| 818 | */ |
| 819 | __u32 retval = asoc->next_tsn; |
| 820 | asoc->next_tsn++; |
| 821 | asoc->unack_data++; |
| 822 | |
| 823 | return retval; |
| 824 | } |
| 825 | |
| 826 | /* Compare two addresses to see if they match. Wildcard addresses |
| 827 | * only match themselves. |
| 828 | */ |
| 829 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, |
| 830 | const union sctp_addr *ss2) |
| 831 | { |
| 832 | struct sctp_af *af; |
| 833 | |
| 834 | af = sctp_get_af_specific(ss1->sa.sa_family); |
| 835 | if (unlikely(!af)) |
| 836 | return 0; |
| 837 | |
| 838 | return af->cmp_addr(ss1, ss2); |
| 839 | } |
| 840 | |
| 841 | /* Return an ecne chunk to get prepended to a packet. |
| 842 | * Note: We are sly and return a shared, prealloced chunk. FIXME: |
| 843 | * No we don't, but we could/should. |
| 844 | */ |
| 845 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc) |
| 846 | { |
| 847 | struct sctp_chunk *chunk; |
| 848 | |
| 849 | /* Send ECNE if needed. |
| 850 | * Not being able to allocate a chunk here is not deadly. |
| 851 | */ |
| 852 | if (asoc->need_ecne) |
| 853 | chunk = sctp_make_ecne(asoc, asoc->last_ecne_tsn); |
| 854 | else |
| 855 | chunk = NULL; |
| 856 | |
| 857 | return chunk; |
| 858 | } |
| 859 | |
| 860 | /* |
| 861 | * Find which transport this TSN was sent on. |
| 862 | */ |
| 863 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *asoc, |
| 864 | __u32 tsn) |
| 865 | { |
| 866 | struct sctp_transport *active; |
| 867 | struct sctp_transport *match; |
| 868 | struct list_head *entry, *pos; |
| 869 | struct sctp_transport *transport; |
| 870 | struct sctp_chunk *chunk; |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 871 | __be32 key = htonl(tsn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
| 873 | match = NULL; |
| 874 | |
| 875 | /* |
| 876 | * FIXME: In general, find a more efficient data structure for |
| 877 | * searching. |
| 878 | */ |
| 879 | |
| 880 | /* |
| 881 | * The general strategy is to search each transport's transmitted |
| 882 | * list. Return which transport this TSN lives on. |
| 883 | * |
| 884 | * Let's be hopeful and check the active_path first. |
| 885 | * Another optimization would be to know if there is only one |
| 886 | * outbound path and not have to look for the TSN at all. |
| 887 | * |
| 888 | */ |
| 889 | |
| 890 | active = asoc->peer.active_path; |
| 891 | |
| 892 | list_for_each(entry, &active->transmitted) { |
| 893 | chunk = list_entry(entry, struct sctp_chunk, transmitted_list); |
| 894 | |
| 895 | if (key == chunk->subh.data_hdr->tsn) { |
| 896 | match = active; |
| 897 | goto out; |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | /* If not found, go search all the other transports. */ |
| 902 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
| 903 | transport = list_entry(pos, struct sctp_transport, transports); |
| 904 | |
| 905 | if (transport == active) |
| 906 | break; |
| 907 | list_for_each(entry, &transport->transmitted) { |
| 908 | chunk = list_entry(entry, struct sctp_chunk, |
| 909 | transmitted_list); |
| 910 | if (key == chunk->subh.data_hdr->tsn) { |
| 911 | match = transport; |
| 912 | goto out; |
| 913 | } |
| 914 | } |
| 915 | } |
| 916 | out: |
| 917 | return match; |
| 918 | } |
| 919 | |
| 920 | /* Is this the association we are looking for? */ |
| 921 | struct sctp_transport *sctp_assoc_is_match(struct sctp_association *asoc, |
| 922 | const union sctp_addr *laddr, |
| 923 | const union sctp_addr *paddr) |
| 924 | { |
| 925 | struct sctp_transport *transport; |
| 926 | |
| 927 | sctp_read_lock(&asoc->base.addr_lock); |
| 928 | |
Al Viro | e2fcced | 2006-11-20 17:08:41 -0800 | [diff] [blame] | 929 | if ((htons(asoc->base.bind_addr.port) == laddr->v4.sin_port) && |
| 930 | (htons(asoc->peer.port) == paddr->v4.sin_port)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | transport = sctp_assoc_lookup_paddr(asoc, paddr); |
| 932 | if (!transport) |
| 933 | goto out; |
| 934 | |
| 935 | if (sctp_bind_addr_match(&asoc->base.bind_addr, laddr, |
| 936 | sctp_sk(asoc->base.sk))) |
| 937 | goto out; |
| 938 | } |
| 939 | transport = NULL; |
| 940 | |
| 941 | out: |
| 942 | sctp_read_unlock(&asoc->base.addr_lock); |
| 943 | return transport; |
| 944 | } |
| 945 | |
| 946 | /* Do delayed input processing. This is scheduled by sctp_rcv(). */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 947 | static void sctp_assoc_bh_rcv(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 949 | struct sctp_association *asoc = |
| 950 | container_of(work, struct sctp_association, |
| 951 | base.inqueue.immediate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | struct sctp_endpoint *ep; |
| 953 | struct sctp_chunk *chunk; |
| 954 | struct sock *sk; |
| 955 | struct sctp_inq *inqueue; |
| 956 | int state; |
| 957 | sctp_subtype_t subtype; |
| 958 | int error = 0; |
| 959 | |
| 960 | /* The association should be held so we should be safe. */ |
| 961 | ep = asoc->ep; |
| 962 | sk = asoc->base.sk; |
| 963 | |
| 964 | inqueue = &asoc->base.inqueue; |
| 965 | sctp_association_hold(asoc); |
| 966 | while (NULL != (chunk = sctp_inq_pop(inqueue))) { |
| 967 | state = asoc->state; |
| 968 | subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type); |
| 969 | |
| 970 | /* Remember where the last DATA chunk came from so we |
| 971 | * know where to send the SACK. |
| 972 | */ |
| 973 | if (sctp_chunk_is_data(chunk)) |
| 974 | asoc->peer.last_data_from = chunk->transport; |
| 975 | else |
| 976 | SCTP_INC_STATS(SCTP_MIB_INCTRLCHUNKS); |
| 977 | |
| 978 | if (chunk->transport) |
| 979 | chunk->transport->last_time_heard = jiffies; |
| 980 | |
| 981 | /* Run through the state machine. */ |
| 982 | error = sctp_do_sm(SCTP_EVENT_T_CHUNK, subtype, |
| 983 | state, ep, asoc, chunk, GFP_ATOMIC); |
| 984 | |
| 985 | /* Check to see if the association is freed in response to |
| 986 | * the incoming chunk. If so, get out of the while loop. |
| 987 | */ |
| 988 | if (asoc->base.dead) |
| 989 | break; |
| 990 | |
| 991 | /* If there is an error on chunk, discard this packet. */ |
| 992 | if (error && chunk) |
| 993 | chunk->pdiscard = 1; |
| 994 | } |
| 995 | sctp_association_put(asoc); |
| 996 | } |
| 997 | |
| 998 | /* This routine moves an association from its old sk to a new sk. */ |
| 999 | void sctp_assoc_migrate(struct sctp_association *assoc, struct sock *newsk) |
| 1000 | { |
| 1001 | struct sctp_sock *newsp = sctp_sk(newsk); |
| 1002 | struct sock *oldsk = assoc->base.sk; |
| 1003 | |
| 1004 | /* Delete the association from the old endpoint's list of |
| 1005 | * associations. |
| 1006 | */ |
| 1007 | list_del_init(&assoc->asocs); |
| 1008 | |
| 1009 | /* Decrement the backlog value for a TCP-style socket. */ |
| 1010 | if (sctp_style(oldsk, TCP)) |
| 1011 | oldsk->sk_ack_backlog--; |
| 1012 | |
| 1013 | /* Release references to the old endpoint and the sock. */ |
| 1014 | sctp_endpoint_put(assoc->ep); |
| 1015 | sock_put(assoc->base.sk); |
| 1016 | |
| 1017 | /* Get a reference to the new endpoint. */ |
| 1018 | assoc->ep = newsp->ep; |
| 1019 | sctp_endpoint_hold(assoc->ep); |
| 1020 | |
| 1021 | /* Get a reference to the new sock. */ |
| 1022 | assoc->base.sk = newsk; |
| 1023 | sock_hold(assoc->base.sk); |
| 1024 | |
| 1025 | /* Add the association to the new endpoint's list of associations. */ |
| 1026 | sctp_endpoint_add_asoc(newsp->ep, assoc); |
| 1027 | } |
| 1028 | |
| 1029 | /* Update an association (possibly from unexpected COOKIE-ECHO processing). */ |
| 1030 | void sctp_assoc_update(struct sctp_association *asoc, |
| 1031 | struct sctp_association *new) |
| 1032 | { |
| 1033 | struct sctp_transport *trans; |
| 1034 | struct list_head *pos, *temp; |
| 1035 | |
| 1036 | /* Copy in new parameters of peer. */ |
| 1037 | asoc->c = new->c; |
| 1038 | asoc->peer.rwnd = new->peer.rwnd; |
| 1039 | asoc->peer.sack_needed = new->peer.sack_needed; |
| 1040 | asoc->peer.i = new->peer.i; |
| 1041 | sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE, |
| 1042 | asoc->peer.i.initial_tsn); |
| 1043 | |
| 1044 | /* Remove any peer addresses not present in the new association. */ |
| 1045 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 1046 | trans = list_entry(pos, struct sctp_transport, transports); |
| 1047 | if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr)) |
| 1048 | sctp_assoc_del_peer(asoc, &trans->ipaddr); |
| 1049 | } |
| 1050 | |
| 1051 | /* If the case is A (association restart), use |
| 1052 | * initial_tsn as next_tsn. If the case is B, use |
| 1053 | * current next_tsn in case data sent to peer |
| 1054 | * has been discarded and needs retransmission. |
| 1055 | */ |
| 1056 | if (asoc->state >= SCTP_STATE_ESTABLISHED) { |
| 1057 | asoc->next_tsn = new->next_tsn; |
| 1058 | asoc->ctsn_ack_point = new->ctsn_ack_point; |
| 1059 | asoc->adv_peer_ack_point = new->adv_peer_ack_point; |
| 1060 | |
| 1061 | /* Reinitialize SSN for both local streams |
| 1062 | * and peer's streams. |
| 1063 | */ |
| 1064 | sctp_ssnmap_clear(asoc->ssnmap); |
| 1065 | |
| 1066 | } else { |
| 1067 | /* Add any peer addresses from the new association. */ |
| 1068 | list_for_each(pos, &new->peer.transport_addr_list) { |
| 1069 | trans = list_entry(pos, struct sctp_transport, |
| 1070 | transports); |
| 1071 | if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr)) |
| 1072 | sctp_assoc_add_peer(asoc, &trans->ipaddr, |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 1073 | GFP_ATOMIC, trans->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | } |
| 1075 | |
| 1076 | asoc->ctsn_ack_point = asoc->next_tsn - 1; |
| 1077 | asoc->adv_peer_ack_point = asoc->ctsn_ack_point; |
| 1078 | if (!asoc->ssnmap) { |
| 1079 | /* Move the ssnmap. */ |
| 1080 | asoc->ssnmap = new->ssnmap; |
| 1081 | new->ssnmap = NULL; |
| 1082 | } |
| 1083 | } |
| 1084 | } |
| 1085 | |
| 1086 | /* Update the retran path for sending a retransmitted packet. |
| 1087 | * Round-robin through the active transports, else round-robin |
| 1088 | * through the inactive transports as this is the next best thing |
| 1089 | * we can try. |
| 1090 | */ |
| 1091 | void sctp_assoc_update_retran_path(struct sctp_association *asoc) |
| 1092 | { |
| 1093 | struct sctp_transport *t, *next; |
| 1094 | struct list_head *head = &asoc->peer.transport_addr_list; |
| 1095 | struct list_head *pos; |
| 1096 | |
| 1097 | /* Find the next transport in a round-robin fashion. */ |
| 1098 | t = asoc->peer.retran_path; |
| 1099 | pos = &t->transports; |
| 1100 | next = NULL; |
| 1101 | |
| 1102 | while (1) { |
| 1103 | /* Skip the head. */ |
| 1104 | if (pos->next == head) |
| 1105 | pos = head->next; |
| 1106 | else |
| 1107 | pos = pos->next; |
| 1108 | |
| 1109 | t = list_entry(pos, struct sctp_transport, transports); |
| 1110 | |
| 1111 | /* Try to find an active transport. */ |
| 1112 | |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 1113 | if ((t->state == SCTP_ACTIVE) || |
| 1114 | (t->state == SCTP_UNKNOWN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | break; |
| 1116 | } else { |
| 1117 | /* Keep track of the next transport in case |
| 1118 | * we don't find any active transport. |
| 1119 | */ |
| 1120 | if (!next) |
| 1121 | next = t; |
| 1122 | } |
| 1123 | |
| 1124 | /* We have exhausted the list, but didn't find any |
| 1125 | * other active transports. If so, use the next |
| 1126 | * transport. |
| 1127 | */ |
| 1128 | if (t == asoc->peer.retran_path) { |
| 1129 | t = next; |
| 1130 | break; |
| 1131 | } |
| 1132 | } |
| 1133 | |
| 1134 | asoc->peer.retran_path = t; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1135 | |
| 1136 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association" |
| 1137 | " %p addr: ", |
| 1138 | " port: %d\n", |
| 1139 | asoc, |
| 1140 | (&t->ipaddr), |
Al Viro | b3f5b3b | 2006-11-20 17:22:43 -0800 | [diff] [blame] | 1141 | ntohs(t->ipaddr.v4.sin_port)); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1142 | } |
| 1143 | |
| 1144 | /* Choose the transport for sending a INIT packet. */ |
| 1145 | struct sctp_transport *sctp_assoc_choose_init_transport( |
| 1146 | struct sctp_association *asoc) |
| 1147 | { |
| 1148 | struct sctp_transport *t; |
| 1149 | |
| 1150 | /* Use the retran path. If the last INIT was sent over the |
| 1151 | * retran path, update the retran path and use it. |
| 1152 | */ |
| 1153 | if (!asoc->init_last_sent_to) { |
| 1154 | t = asoc->peer.active_path; |
| 1155 | } else { |
| 1156 | if (asoc->init_last_sent_to == asoc->peer.retran_path) |
| 1157 | sctp_assoc_update_retran_path(asoc); |
| 1158 | t = asoc->peer.retran_path; |
| 1159 | } |
| 1160 | |
| 1161 | SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association" |
| 1162 | " %p addr: ", |
| 1163 | " port: %d\n", |
| 1164 | asoc, |
| 1165 | (&t->ipaddr), |
Al Viro | b3f5b3b | 2006-11-20 17:22:43 -0800 | [diff] [blame] | 1166 | ntohs(t->ipaddr.v4.sin_port)); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1167 | |
| 1168 | return t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | } |
| 1170 | |
| 1171 | /* Choose the transport for sending a SHUTDOWN packet. */ |
| 1172 | struct sctp_transport *sctp_assoc_choose_shutdown_transport( |
| 1173 | struct sctp_association *asoc) |
| 1174 | { |
| 1175 | /* If this is the first time SHUTDOWN is sent, use the active path, |
| 1176 | * else use the retran path. If the last SHUTDOWN was sent over the |
| 1177 | * retran path, update the retran path and use it. |
| 1178 | */ |
| 1179 | if (!asoc->shutdown_last_sent_to) |
| 1180 | return asoc->peer.active_path; |
| 1181 | else { |
| 1182 | if (asoc->shutdown_last_sent_to == asoc->peer.retran_path) |
| 1183 | sctp_assoc_update_retran_path(asoc); |
| 1184 | return asoc->peer.retran_path; |
| 1185 | } |
| 1186 | |
| 1187 | } |
| 1188 | |
| 1189 | /* Update the association's pmtu and frag_point by going through all the |
| 1190 | * transports. This routine is called when a transport's PMTU has changed. |
| 1191 | */ |
| 1192 | void sctp_assoc_sync_pmtu(struct sctp_association *asoc) |
| 1193 | { |
| 1194 | struct sctp_transport *t; |
| 1195 | struct list_head *pos; |
| 1196 | __u32 pmtu = 0; |
| 1197 | |
| 1198 | if (!asoc) |
| 1199 | return; |
| 1200 | |
| 1201 | /* Get the lowest pmtu of all the transports. */ |
| 1202 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
| 1203 | t = list_entry(pos, struct sctp_transport, transports); |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1204 | if (!pmtu || (t->pathmtu < pmtu)) |
| 1205 | pmtu = t->pathmtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | } |
| 1207 | |
| 1208 | if (pmtu) { |
| 1209 | struct sctp_sock *sp = sctp_sk(asoc->base.sk); |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1210 | asoc->pathmtu = pmtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | asoc->frag_point = sctp_frag_point(sp, pmtu); |
| 1212 | } |
| 1213 | |
| 1214 | SCTP_DEBUG_PRINTK("%s: asoc:%p, pmtu:%d, frag_point:%d\n", |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1215 | __FUNCTION__, asoc, asoc->pathmtu, asoc->frag_point); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | } |
| 1217 | |
| 1218 | /* Should we send a SACK to update our peer? */ |
| 1219 | static inline int sctp_peer_needs_update(struct sctp_association *asoc) |
| 1220 | { |
| 1221 | switch (asoc->state) { |
| 1222 | case SCTP_STATE_ESTABLISHED: |
| 1223 | case SCTP_STATE_SHUTDOWN_PENDING: |
| 1224 | case SCTP_STATE_SHUTDOWN_RECEIVED: |
| 1225 | case SCTP_STATE_SHUTDOWN_SENT: |
| 1226 | if ((asoc->rwnd > asoc->a_rwnd) && |
| 1227 | ((asoc->rwnd - asoc->a_rwnd) >= |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1228 | min_t(__u32, (asoc->base.sk->sk_rcvbuf >> 1), asoc->pathmtu))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | return 1; |
| 1230 | break; |
| 1231 | default: |
| 1232 | break; |
| 1233 | } |
| 1234 | return 0; |
| 1235 | } |
| 1236 | |
| 1237 | /* Increase asoc's rwnd by len and send any window update SACK if needed. */ |
| 1238 | void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned len) |
| 1239 | { |
| 1240 | struct sctp_chunk *sack; |
| 1241 | struct timer_list *timer; |
| 1242 | |
| 1243 | if (asoc->rwnd_over) { |
| 1244 | if (asoc->rwnd_over >= len) { |
| 1245 | asoc->rwnd_over -= len; |
| 1246 | } else { |
| 1247 | asoc->rwnd += (len - asoc->rwnd_over); |
| 1248 | asoc->rwnd_over = 0; |
| 1249 | } |
| 1250 | } else { |
| 1251 | asoc->rwnd += len; |
| 1252 | } |
| 1253 | |
| 1254 | SCTP_DEBUG_PRINTK("%s: asoc %p rwnd increased by %d to (%u, %u) " |
| 1255 | "- %u\n", __FUNCTION__, asoc, len, asoc->rwnd, |
| 1256 | asoc->rwnd_over, asoc->a_rwnd); |
| 1257 | |
| 1258 | /* Send a window update SACK if the rwnd has increased by at least the |
| 1259 | * minimum of the association's PMTU and half of the receive buffer. |
| 1260 | * The algorithm used is similar to the one described in |
| 1261 | * Section 4.2.3.3 of RFC 1122. |
| 1262 | */ |
| 1263 | if (sctp_peer_needs_update(asoc)) { |
| 1264 | asoc->a_rwnd = asoc->rwnd; |
| 1265 | SCTP_DEBUG_PRINTK("%s: Sending window update SACK- asoc: %p " |
| 1266 | "rwnd: %u a_rwnd: %u\n", __FUNCTION__, |
| 1267 | asoc, asoc->rwnd, asoc->a_rwnd); |
| 1268 | sack = sctp_make_sack(asoc); |
| 1269 | if (!sack) |
| 1270 | return; |
| 1271 | |
| 1272 | asoc->peer.sack_needed = 0; |
| 1273 | |
| 1274 | sctp_outq_tail(&asoc->outqueue, sack); |
| 1275 | |
| 1276 | /* Stop the SACK timer. */ |
| 1277 | timer = &asoc->timers[SCTP_EVENT_TIMEOUT_SACK]; |
| 1278 | if (timer_pending(timer) && del_timer(timer)) |
| 1279 | sctp_association_put(asoc); |
| 1280 | } |
| 1281 | } |
| 1282 | |
| 1283 | /* Decrease asoc's rwnd by len. */ |
| 1284 | void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned len) |
| 1285 | { |
| 1286 | SCTP_ASSERT(asoc->rwnd, "rwnd zero", return); |
| 1287 | SCTP_ASSERT(!asoc->rwnd_over, "rwnd_over not zero", return); |
| 1288 | if (asoc->rwnd >= len) { |
| 1289 | asoc->rwnd -= len; |
| 1290 | } else { |
| 1291 | asoc->rwnd_over = len - asoc->rwnd; |
| 1292 | asoc->rwnd = 0; |
| 1293 | } |
| 1294 | SCTP_DEBUG_PRINTK("%s: asoc %p rwnd decreased by %d to (%u, %u)\n", |
| 1295 | __FUNCTION__, asoc, len, asoc->rwnd, |
| 1296 | asoc->rwnd_over); |
| 1297 | } |
| 1298 | |
| 1299 | /* Build the bind address list for the association based on info from the |
| 1300 | * local endpoint and the remote peer. |
| 1301 | */ |
Alexey Dobriyan | 3182cd84 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1302 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1303 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | { |
| 1305 | sctp_scope_t scope; |
| 1306 | int flags; |
| 1307 | |
| 1308 | /* Use scoping rules to determine the subset of addresses from |
| 1309 | * the endpoint. |
| 1310 | */ |
| 1311 | scope = sctp_scope(&asoc->peer.active_path->ipaddr); |
| 1312 | flags = (PF_INET6 == asoc->base.sk->sk_family) ? SCTP_ADDR6_ALLOWED : 0; |
| 1313 | if (asoc->peer.ipv4_address) |
| 1314 | flags |= SCTP_ADDR4_PEERSUPP; |
| 1315 | if (asoc->peer.ipv6_address) |
| 1316 | flags |= SCTP_ADDR6_PEERSUPP; |
| 1317 | |
| 1318 | return sctp_bind_addr_copy(&asoc->base.bind_addr, |
| 1319 | &asoc->ep->base.bind_addr, |
| 1320 | scope, gfp, flags); |
| 1321 | } |
| 1322 | |
| 1323 | /* Build the association's bind address list from the cookie. */ |
| 1324 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *asoc, |
Alexey Dobriyan | 3182cd84 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1325 | struct sctp_cookie *cookie, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1326 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | { |
| 1328 | int var_size2 = ntohs(cookie->peer_init->chunk_hdr.length); |
| 1329 | int var_size3 = cookie->raw_addr_list_len; |
| 1330 | __u8 *raw = (__u8 *)cookie->peer_init + var_size2; |
| 1331 | |
| 1332 | return sctp_raw_to_bind_addrs(&asoc->base.bind_addr, raw, var_size3, |
| 1333 | asoc->ep->base.bind_addr.port, gfp); |
| 1334 | } |
| 1335 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1336 | /* Lookup laddr in the bind address list of an association. */ |
| 1337 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | const union sctp_addr *laddr) |
| 1339 | { |
| 1340 | int found; |
| 1341 | |
| 1342 | sctp_read_lock(&asoc->base.addr_lock); |
| 1343 | if ((asoc->base.bind_addr.port == ntohs(laddr->v4.sin_port)) && |
| 1344 | sctp_bind_addr_match(&asoc->base.bind_addr, laddr, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1345 | sctp_sk(asoc->base.sk))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | found = 1; |
| 1347 | goto out; |
| 1348 | } |
| 1349 | |
| 1350 | found = 0; |
| 1351 | out: |
| 1352 | sctp_read_unlock(&asoc->base.addr_lock); |
| 1353 | return found; |
| 1354 | } |