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 Cisco, Inc. |
| 4 | * Copyright (c) 1999-2001 Motorola, Inc. |
| 5 | * |
| 6 | * This file is part of the SCTP kernel reference Implementation |
| 7 | * |
| 8 | * These functions work with the state functions in sctp_sm_statefuns.c |
| 9 | * to implement that state operations. These functions implement the |
| 10 | * steps which require modifying existing data structures. |
| 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@austin.ibm.com> |
| 40 | * Hui Huang <hui.huang@nokia.com> |
| 41 | * Dajiang Zhang <dajiang.zhang@nokia.com> |
| 42 | * Daisy Chang <daisyc@us.ibm.com> |
| 43 | * Sridhar Samudrala <sri@us.ibm.com> |
| 44 | * Ardelle Fan <ardelle.fan@intel.com> |
| 45 | * |
| 46 | * Any bugs reported given to us we will try to fix... any fixes shared will |
| 47 | * be incorporated into the next SCTP release. |
| 48 | */ |
| 49 | |
| 50 | #include <linux/skbuff.h> |
| 51 | #include <linux/types.h> |
| 52 | #include <linux/socket.h> |
| 53 | #include <linux/ip.h> |
| 54 | #include <net/sock.h> |
| 55 | #include <net/sctp/sctp.h> |
| 56 | #include <net/sctp/sm.h> |
| 57 | |
| 58 | static int sctp_cmd_interpreter(sctp_event_t event_type, |
| 59 | sctp_subtype_t subtype, |
| 60 | sctp_state_t state, |
| 61 | struct sctp_endpoint *ep, |
| 62 | struct sctp_association *asoc, |
| 63 | void *event_arg, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 64 | sctp_disposition_t status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | sctp_cmd_seq_t *commands, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 66 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, |
| 68 | sctp_state_t state, |
| 69 | struct sctp_endpoint *ep, |
| 70 | struct sctp_association *asoc, |
| 71 | void *event_arg, |
| 72 | sctp_disposition_t status, |
| 73 | sctp_cmd_seq_t *commands, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 74 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | /******************************************************************** |
| 77 | * Helper functions |
| 78 | ********************************************************************/ |
| 79 | |
| 80 | /* A helper function for delayed processing of INET ECN CE bit. */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 81 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | __u32 lowest_tsn) |
| 83 | { |
| 84 | /* Save the TSN away for comparison when we receive CWR */ |
| 85 | |
| 86 | asoc->last_ecne_tsn = lowest_tsn; |
| 87 | asoc->need_ecne = 1; |
| 88 | } |
| 89 | |
| 90 | /* Helper function for delayed processing of SCTP ECNE chunk. */ |
| 91 | /* RFC 2960 Appendix A |
| 92 | * |
| 93 | * RFC 2481 details a specific bit for a sender to send in |
| 94 | * the header of its next outbound TCP segment to indicate to |
| 95 | * its peer that it has reduced its congestion window. This |
| 96 | * is termed the CWR bit. For SCTP the same indication is made |
| 97 | * by including the CWR chunk. This chunk contains one data |
| 98 | * element, i.e. the TSN number that was sent in the ECNE chunk. |
| 99 | * This element represents the lowest TSN number in the datagram |
| 100 | * that was originally marked with the CE bit. |
| 101 | */ |
| 102 | static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc, |
| 103 | __u32 lowest_tsn, |
| 104 | struct sctp_chunk *chunk) |
| 105 | { |
| 106 | struct sctp_chunk *repl; |
| 107 | |
| 108 | /* Our previously transmitted packet ran into some congestion |
| 109 | * so we should take action by reducing cwnd and ssthresh |
| 110 | * and then ACK our peer that we we've done so by |
| 111 | * sending a CWR. |
| 112 | */ |
| 113 | |
| 114 | /* First, try to determine if we want to actually lower |
| 115 | * our cwnd variables. Only lower them if the ECNE looks more |
| 116 | * recent than the last response. |
| 117 | */ |
| 118 | if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) { |
| 119 | struct sctp_transport *transport; |
| 120 | |
| 121 | /* Find which transport's congestion variables |
| 122 | * need to be adjusted. |
| 123 | */ |
| 124 | transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn); |
| 125 | |
| 126 | /* Update the congestion variables. */ |
| 127 | if (transport) |
| 128 | sctp_transport_lower_cwnd(transport, |
| 129 | SCTP_LOWER_CWND_ECNE); |
| 130 | asoc->last_cwr_tsn = lowest_tsn; |
| 131 | } |
| 132 | |
| 133 | /* Always try to quiet the other end. In case of lost CWR, |
| 134 | * resend last_cwr_tsn. |
| 135 | */ |
| 136 | repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk); |
| 137 | |
| 138 | /* If we run out of memory, it will look like a lost CWR. We'll |
| 139 | * get back in sync eventually. |
| 140 | */ |
| 141 | return repl; |
| 142 | } |
| 143 | |
| 144 | /* Helper function to do delayed processing of ECN CWR chunk. */ |
| 145 | static void sctp_do_ecn_cwr_work(struct sctp_association *asoc, |
| 146 | __u32 lowest_tsn) |
| 147 | { |
| 148 | /* Turn off ECNE getting auto-prepended to every outgoing |
| 149 | * packet |
| 150 | */ |
| 151 | asoc->need_ecne = 0; |
| 152 | } |
| 153 | |
| 154 | /* Generate SACK if necessary. We call this at the end of a packet. */ |
| 155 | static int sctp_gen_sack(struct sctp_association *asoc, int force, |
| 156 | sctp_cmd_seq_t *commands) |
| 157 | { |
| 158 | __u32 ctsn, max_tsn_seen; |
| 159 | struct sctp_chunk *sack; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 160 | struct sctp_transport *trans = asoc->peer.last_data_from; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | int error = 0; |
| 162 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 163 | if (force || |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 164 | (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || |
| 165 | (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | asoc->peer.sack_needed = 1; |
| 167 | |
| 168 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
| 169 | max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); |
| 170 | |
| 171 | /* From 12.2 Parameters necessary per association (i.e. the TCB): |
| 172 | * |
| 173 | * Ack State : This flag indicates if the next received packet |
| 174 | * : is to be responded to with a SACK. ... |
| 175 | * : When DATA chunks are out of order, SACK's |
| 176 | * : are not delayed (see Section 6). |
| 177 | * |
| 178 | * [This is actually not mentioned in Section 6, but we |
| 179 | * implement it here anyway. --piggy] |
| 180 | */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 181 | if (max_tsn_seen != ctsn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | asoc->peer.sack_needed = 1; |
| 183 | |
| 184 | /* From 6.2 Acknowledgement on Reception of DATA Chunks: |
| 185 | * |
| 186 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, |
| 187 | * an acknowledgement SHOULD be generated for at least every |
| 188 | * second packet (not every second DATA chunk) received, and |
| 189 | * SHOULD be generated within 200 ms of the arrival of any |
| 190 | * unacknowledged DATA chunk. ... |
| 191 | */ |
| 192 | if (!asoc->peer.sack_needed) { |
| 193 | /* We will need a SACK for the next packet. */ |
| 194 | asoc->peer.sack_needed = 1; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 195 | |
| 196 | /* Set the SACK delay timeout based on the |
| 197 | * SACK delay for the last transport |
| 198 | * data was received from, or the default |
| 199 | * for the association. |
| 200 | */ |
| 201 | if (trans) |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 202 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 203 | trans->sackdelay; |
| 204 | else |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 205 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 206 | asoc->sackdelay; |
| 207 | |
| 208 | /* Restart the SACK timer. */ |
| 209 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
| 210 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } else { |
| 212 | if (asoc->a_rwnd > asoc->rwnd) |
| 213 | asoc->a_rwnd = asoc->rwnd; |
| 214 | sack = sctp_make_sack(asoc); |
| 215 | if (!sack) |
| 216 | goto nomem; |
| 217 | |
| 218 | asoc->peer.sack_needed = 0; |
| 219 | |
Vlad Yasevich | 732ba35 | 2007-01-15 19:20:21 -0800 | [diff] [blame] | 220 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
| 222 | /* Stop the SACK timer. */ |
| 223 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
| 224 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); |
| 225 | } |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | return error; |
| 228 | nomem: |
| 229 | error = -ENOMEM; |
| 230 | return error; |
| 231 | } |
| 232 | |
| 233 | /* When the T3-RTX timer expires, it calls this function to create the |
| 234 | * relevant state machine event. |
| 235 | */ |
| 236 | void sctp_generate_t3_rtx_event(unsigned long peer) |
| 237 | { |
| 238 | int error; |
| 239 | struct sctp_transport *transport = (struct sctp_transport *) peer; |
| 240 | struct sctp_association *asoc = transport->asoc; |
| 241 | |
| 242 | /* Check whether a task is in the sock. */ |
| 243 | |
| 244 | sctp_bh_lock_sock(asoc->base.sk); |
| 245 | if (sock_owned_by_user(asoc->base.sk)) { |
| 246 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__); |
| 247 | |
| 248 | /* Try again later. */ |
| 249 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) |
| 250 | sctp_transport_hold(transport); |
| 251 | goto out_unlock; |
| 252 | } |
| 253 | |
| 254 | /* Is this transport really dead and just waiting around for |
| 255 | * the timer to let go of the reference? |
| 256 | */ |
| 257 | if (transport->dead) |
| 258 | goto out_unlock; |
| 259 | |
| 260 | /* Run through the state machine. */ |
| 261 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, |
| 262 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), |
| 263 | asoc->state, |
| 264 | asoc->ep, asoc, |
| 265 | transport, GFP_ATOMIC); |
| 266 | |
| 267 | if (error) |
| 268 | asoc->base.sk->sk_err = -error; |
| 269 | |
| 270 | out_unlock: |
| 271 | sctp_bh_unlock_sock(asoc->base.sk); |
| 272 | sctp_transport_put(transport); |
| 273 | } |
| 274 | |
| 275 | /* This is a sa interface for producing timeout events. It works |
| 276 | * for timeouts which use the association as their parameter. |
| 277 | */ |
| 278 | static void sctp_generate_timeout_event(struct sctp_association *asoc, |
| 279 | sctp_event_timeout_t timeout_type) |
| 280 | { |
| 281 | int error = 0; |
| 282 | |
| 283 | sctp_bh_lock_sock(asoc->base.sk); |
| 284 | if (sock_owned_by_user(asoc->base.sk)) { |
| 285 | SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n", |
| 286 | __FUNCTION__, |
| 287 | timeout_type); |
| 288 | |
| 289 | /* Try again later. */ |
| 290 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) |
| 291 | sctp_association_hold(asoc); |
| 292 | goto out_unlock; |
| 293 | } |
| 294 | |
| 295 | /* Is this association really dead and just waiting around for |
| 296 | * the timer to let go of the reference? |
| 297 | */ |
| 298 | if (asoc->base.dead) |
| 299 | goto out_unlock; |
| 300 | |
| 301 | /* Run through the state machine. */ |
| 302 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, |
| 303 | SCTP_ST_TIMEOUT(timeout_type), |
| 304 | asoc->state, asoc->ep, asoc, |
| 305 | (void *)timeout_type, GFP_ATOMIC); |
| 306 | |
| 307 | if (error) |
| 308 | asoc->base.sk->sk_err = -error; |
| 309 | |
| 310 | out_unlock: |
| 311 | sctp_bh_unlock_sock(asoc->base.sk); |
| 312 | sctp_association_put(asoc); |
| 313 | } |
| 314 | |
| 315 | static void sctp_generate_t1_cookie_event(unsigned long data) |
| 316 | { |
| 317 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 318 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); |
| 319 | } |
| 320 | |
| 321 | static void sctp_generate_t1_init_event(unsigned long data) |
| 322 | { |
| 323 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 324 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); |
| 325 | } |
| 326 | |
| 327 | static void sctp_generate_t2_shutdown_event(unsigned long data) |
| 328 | { |
| 329 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 330 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); |
| 331 | } |
| 332 | |
| 333 | static void sctp_generate_t4_rto_event(unsigned long data) |
| 334 | { |
| 335 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 336 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); |
| 337 | } |
| 338 | |
| 339 | static void sctp_generate_t5_shutdown_guard_event(unsigned long data) |
| 340 | { |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 341 | struct sctp_association *asoc = (struct sctp_association *)data; |
| 342 | sctp_generate_timeout_event(asoc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
| 344 | |
| 345 | } /* sctp_generate_t5_shutdown_guard_event() */ |
| 346 | |
| 347 | static void sctp_generate_autoclose_event(unsigned long data) |
| 348 | { |
| 349 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 350 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); |
| 351 | } |
| 352 | |
| 353 | /* Generate a heart beat event. If the sock is busy, reschedule. Make |
| 354 | * sure that the transport is still valid. |
| 355 | */ |
| 356 | void sctp_generate_heartbeat_event(unsigned long data) |
| 357 | { |
| 358 | int error = 0; |
| 359 | struct sctp_transport *transport = (struct sctp_transport *) data; |
| 360 | struct sctp_association *asoc = transport->asoc; |
| 361 | |
| 362 | sctp_bh_lock_sock(asoc->base.sk); |
| 363 | if (sock_owned_by_user(asoc->base.sk)) { |
| 364 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __FUNCTION__); |
| 365 | |
| 366 | /* Try again later. */ |
| 367 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) |
| 368 | sctp_transport_hold(transport); |
| 369 | goto out_unlock; |
| 370 | } |
| 371 | |
| 372 | /* Is this structure just waiting around for us to actually |
| 373 | * get destroyed? |
| 374 | */ |
| 375 | if (transport->dead) |
| 376 | goto out_unlock; |
| 377 | |
| 378 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, |
| 379 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
| 380 | asoc->state, asoc->ep, asoc, |
| 381 | transport, GFP_ATOMIC); |
| 382 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 383 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | asoc->base.sk->sk_err = -error; |
| 385 | |
| 386 | out_unlock: |
| 387 | sctp_bh_unlock_sock(asoc->base.sk); |
| 388 | sctp_transport_put(transport); |
| 389 | } |
| 390 | |
| 391 | /* Inject a SACK Timeout event into the state machine. */ |
| 392 | static void sctp_generate_sack_event(unsigned long data) |
| 393 | { |
| 394 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 395 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); |
| 396 | } |
| 397 | |
| 398 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { |
| 399 | NULL, |
| 400 | sctp_generate_t1_cookie_event, |
| 401 | sctp_generate_t1_init_event, |
| 402 | sctp_generate_t2_shutdown_event, |
| 403 | NULL, |
| 404 | sctp_generate_t4_rto_event, |
| 405 | sctp_generate_t5_shutdown_guard_event, |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 406 | NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | sctp_generate_sack_event, |
| 408 | sctp_generate_autoclose_event, |
| 409 | }; |
| 410 | |
| 411 | |
| 412 | /* RFC 2960 8.2 Path Failure Detection |
| 413 | * |
| 414 | * When its peer endpoint is multi-homed, an endpoint should keep a |
| 415 | * error counter for each of the destination transport addresses of the |
| 416 | * peer endpoint. |
| 417 | * |
| 418 | * Each time the T3-rtx timer expires on any address, or when a |
| 419 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, |
| 420 | * the error counter of that destination address will be incremented. |
| 421 | * When the value in the error counter exceeds the protocol parameter |
| 422 | * 'Path.Max.Retrans' of that destination address, the endpoint should |
| 423 | * mark the destination transport address as inactive, and a |
| 424 | * notification SHOULD be sent to the upper layer. |
| 425 | * |
| 426 | */ |
| 427 | static void sctp_do_8_2_transport_strike(struct sctp_association *asoc, |
| 428 | struct sctp_transport *transport) |
| 429 | { |
| 430 | /* The check for association's overall error counter exceeding the |
| 431 | * threshold is done in the state function. |
| 432 | */ |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 433 | /* When probing UNCONFIRMED addresses, the association overall |
| 434 | * error count is NOT incremented |
| 435 | */ |
| 436 | if (transport->state != SCTP_UNCONFIRMED) |
| 437 | asoc->overall_error_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 439 | if (transport->state != SCTP_INACTIVE && |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 440 | (transport->error_count++ >= transport->pathmaxrxt)) { |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 441 | SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p", |
| 442 | " transport IP: port:%d failed.\n", |
| 443 | asoc, |
Al Viro | b3f5b3b | 2006-11-20 17:22:43 -0800 | [diff] [blame] | 444 | (&transport->ipaddr), |
| 445 | ntohs(transport->ipaddr.v4.sin_port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | sctp_assoc_control_transport(asoc, transport, |
| 447 | SCTP_TRANSPORT_DOWN, |
| 448 | SCTP_FAILED_THRESHOLD); |
| 449 | } |
| 450 | |
| 451 | /* E2) For the destination address for which the timer |
| 452 | * expires, set RTO <- RTO * 2 ("back off the timer"). The |
| 453 | * maximum value discussed in rule C7 above (RTO.max) may be |
| 454 | * used to provide an upper bound to this doubling operation. |
| 455 | */ |
Vlad Yasevich | b6157d8 | 2007-10-24 15:59:16 -0400 | [diff] [blame] | 456 | transport->last_rto = transport->rto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
| 458 | } |
| 459 | |
| 460 | /* Worker routine to handle INIT command failure. */ |
| 461 | static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, |
| 462 | struct sctp_association *asoc, |
| 463 | unsigned error) |
| 464 | { |
| 465 | struct sctp_ulpevent *event; |
| 466 | |
| 467 | event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC, |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 468 | (__u16)error, 0, 0, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | GFP_ATOMIC); |
| 470 | |
| 471 | if (event) |
| 472 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
| 473 | SCTP_ULPEVENT(event)); |
| 474 | |
| 475 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
| 476 | SCTP_STATE(SCTP_STATE_CLOSED)); |
| 477 | |
| 478 | /* SEND_FAILED sent later when cleaning up the association. */ |
| 479 | asoc->outqueue.error = error; |
| 480 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
| 481 | } |
| 482 | |
| 483 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ |
| 484 | static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, |
| 485 | struct sctp_association *asoc, |
| 486 | sctp_event_t event_type, |
| 487 | sctp_subtype_t subtype, |
| 488 | struct sctp_chunk *chunk, |
| 489 | unsigned error) |
| 490 | { |
| 491 | struct sctp_ulpevent *event; |
| 492 | |
| 493 | /* Cancel any partial delivery in progress. */ |
| 494 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); |
| 495 | |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 496 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
| 497 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, |
| 498 | (__u16)error, 0, 0, chunk, |
| 499 | GFP_ATOMIC); |
| 500 | else |
| 501 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, |
| 502 | (__u16)error, 0, 0, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | GFP_ATOMIC); |
| 504 | if (event) |
| 505 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
| 506 | SCTP_ULPEVENT(event)); |
| 507 | |
| 508 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
| 509 | SCTP_STATE(SCTP_STATE_CLOSED)); |
| 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | /* SEND_FAILED sent later when cleaning up the association. */ |
| 512 | asoc->outqueue.error = error; |
| 513 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
| 514 | } |
| 515 | |
| 516 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT |
| 517 | * inside the cookie. In reality, this is only used for INIT-ACK processing |
| 518 | * since all other cases use "temporary" associations and can do all |
| 519 | * their work in statefuns directly. |
| 520 | */ |
| 521 | static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, |
| 522 | struct sctp_association *asoc, |
| 523 | struct sctp_chunk *chunk, |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 524 | sctp_init_chunk_t *peer_init, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 525 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | { |
| 527 | int error; |
| 528 | |
| 529 | /* We only process the init as a sideeffect in a single |
| 530 | * case. This is when we process the INIT-ACK. If we |
| 531 | * fail during INIT processing (due to malloc problems), |
| 532 | * just return the error and stop processing the stack. |
| 533 | */ |
| 534 | if (!sctp_process_init(asoc, chunk->chunk_hdr->type, |
| 535 | sctp_source(chunk), peer_init, gfp)) |
| 536 | error = -ENOMEM; |
| 537 | else |
| 538 | error = 0; |
| 539 | |
| 540 | return error; |
| 541 | } |
| 542 | |
| 543 | /* Helper function to break out starting up of heartbeat timers. */ |
| 544 | static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, |
| 545 | struct sctp_association *asoc) |
| 546 | { |
| 547 | struct sctp_transport *t; |
| 548 | struct list_head *pos; |
| 549 | |
| 550 | /* Start a heartbeat timer for each transport on the association. |
| 551 | * hold a reference on the transport to make sure none of |
| 552 | * the needed data structures go away. |
| 553 | */ |
| 554 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
| 555 | t = list_entry(pos, struct sctp_transport, transports); |
| 556 | |
| 557 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) |
| 558 | sctp_transport_hold(t); |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, |
| 563 | struct sctp_association *asoc) |
| 564 | { |
| 565 | struct sctp_transport *t; |
| 566 | struct list_head *pos; |
| 567 | |
| 568 | /* Stop all heartbeat timers. */ |
| 569 | |
| 570 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
| 571 | t = list_entry(pos, struct sctp_transport, transports); |
| 572 | if (del_timer(&t->hb_timer)) |
| 573 | sctp_transport_put(t); |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | /* Helper function to stop any pending T3-RTX timers */ |
| 578 | static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 579 | struct sctp_association *asoc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | { |
| 581 | struct sctp_transport *t; |
| 582 | struct list_head *pos; |
| 583 | |
| 584 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
| 585 | t = list_entry(pos, struct sctp_transport, transports); |
| 586 | if (timer_pending(&t->T3_rtx_timer) && |
| 587 | del_timer(&t->T3_rtx_timer)) { |
| 588 | sctp_transport_put(t); |
| 589 | } |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | |
| 594 | /* Helper function to update the heartbeat timer. */ |
| 595 | static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, |
| 596 | struct sctp_association *asoc, |
| 597 | struct sctp_transport *t) |
| 598 | { |
| 599 | /* Update the heartbeat timer. */ |
| 600 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) |
| 601 | sctp_transport_hold(t); |
| 602 | } |
| 603 | |
| 604 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ |
| 605 | static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, |
| 606 | struct sctp_association *asoc, |
| 607 | struct sctp_transport *t, |
| 608 | struct sctp_chunk *chunk) |
| 609 | { |
| 610 | sctp_sender_hb_info_t *hbinfo; |
| 611 | |
| 612 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the |
| 613 | * HEARTBEAT should clear the error counter of the destination |
| 614 | * transport address to which the HEARTBEAT was sent. |
| 615 | * The association's overall error count is also cleared. |
| 616 | */ |
| 617 | t->error_count = 0; |
| 618 | t->asoc->overall_error_count = 0; |
| 619 | |
| 620 | /* Mark the destination transport address as active if it is not so |
| 621 | * marked. |
| 622 | */ |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 623 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
| 625 | SCTP_HEARTBEAT_SUCCESS); |
| 626 | |
| 627 | /* The receiver of the HEARTBEAT ACK should also perform an |
| 628 | * RTT measurement for that destination transport address |
| 629 | * using the time value carried in the HEARTBEAT ACK chunk. |
Vlad Yasevich | e533ca1 | 2007-01-30 14:36:14 -0800 | [diff] [blame] | 630 | * If the transport's rto_pending variable has been cleared, |
| 631 | * it was most likely due to a retransmit. However, we want |
| 632 | * to re-enable it to properly update the rto. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | */ |
Vlad Yasevich | e533ca1 | 2007-01-30 14:36:14 -0800 | [diff] [blame] | 634 | if (t->rto_pending == 0) |
| 635 | t->rto_pending = 1; |
| 636 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; |
| 638 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 639 | |
| 640 | /* Update the heartbeat timer. */ |
| 641 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) |
| 642 | sctp_transport_hold(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | } |
| 644 | |
| 645 | /* Helper function to do a transport reset at the expiry of the hearbeat |
| 646 | * timer. |
| 647 | */ |
| 648 | static void sctp_cmd_transport_reset(sctp_cmd_seq_t *cmds, |
| 649 | struct sctp_association *asoc, |
| 650 | struct sctp_transport *t) |
| 651 | { |
| 652 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); |
| 653 | |
| 654 | /* Mark one strike against a transport. */ |
| 655 | sctp_do_8_2_transport_strike(asoc, t); |
| 656 | } |
| 657 | |
| 658 | /* Helper function to process the process SACK command. */ |
| 659 | static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, |
| 660 | struct sctp_association *asoc, |
| 661 | struct sctp_sackhdr *sackh) |
| 662 | { |
| 663 | int err; |
| 664 | |
| 665 | if (sctp_outq_sack(&asoc->outqueue, sackh)) { |
| 666 | /* There are no more TSNs awaiting SACK. */ |
| 667 | err = sctp_do_sm(SCTP_EVENT_T_OTHER, |
| 668 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
| 669 | asoc->state, asoc->ep, asoc, NULL, |
| 670 | GFP_ATOMIC); |
| 671 | } else { |
| 672 | /* Windows may have opened, so we need |
| 673 | * to check if we have DATA to transmit |
| 674 | */ |
| 675 | err = sctp_outq_flush(&asoc->outqueue, 0); |
| 676 | } |
| 677 | |
| 678 | return err; |
| 679 | } |
| 680 | |
| 681 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set |
| 682 | * the transport for a shutdown chunk. |
| 683 | */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 684 | static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | struct sctp_association *asoc, |
| 686 | struct sctp_chunk *chunk) |
| 687 | { |
| 688 | struct sctp_transport *t; |
| 689 | |
| 690 | t = sctp_assoc_choose_shutdown_transport(asoc); |
| 691 | asoc->shutdown_last_sent_to = t; |
| 692 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; |
| 693 | chunk->transport = t; |
| 694 | } |
| 695 | |
| 696 | /* Helper function to change the state of an association. */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 697 | static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | struct sctp_association *asoc, |
| 699 | sctp_state_t state) |
| 700 | { |
| 701 | struct sock *sk = asoc->base.sk; |
| 702 | |
| 703 | asoc->state = state; |
| 704 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 705 | SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n", |
| 706 | asoc, sctp_state_tbl[state]); |
| 707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | if (sctp_style(sk, TCP)) { |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 709 | /* Change the sk->sk_state of a TCP-style socket that has |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | * sucessfully completed a connect() call. |
| 711 | */ |
| 712 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) |
| 713 | sk->sk_state = SCTP_SS_ESTABLISHED; |
| 714 | |
| 715 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ |
| 716 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && |
| 717 | sctp_sstate(sk, ESTABLISHED)) |
| 718 | sk->sk_shutdown |= RCV_SHUTDOWN; |
| 719 | } |
| 720 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 721 | if (sctp_state(asoc, COOKIE_WAIT)) { |
| 722 | /* Reset init timeouts since they may have been |
| 723 | * increased due to timer expirations. |
| 724 | */ |
| 725 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 726 | asoc->rto_initial; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 727 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 728 | asoc->rto_initial; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 729 | } |
| 730 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | if (sctp_state(asoc, ESTABLISHED) || |
| 732 | sctp_state(asoc, CLOSED) || |
| 733 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { |
| 734 | /* Wake up any processes waiting in the asoc's wait queue in |
| 735 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 736 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | if (waitqueue_active(&asoc->wait)) |
| 738 | wake_up_interruptible(&asoc->wait); |
| 739 | |
| 740 | /* Wake up any processes waiting in the sk's sleep queue of |
| 741 | * a TCP-style or UDP-style peeled-off socket in |
| 742 | * sctp_wait_for_accept() or sctp_wait_for_packet(). |
| 743 | * For a UDP-style socket, the waiters are woken up by the |
| 744 | * notifications. |
| 745 | */ |
| 746 | if (!sctp_style(sk, UDP)) |
| 747 | sk->sk_state_change(sk); |
| 748 | } |
| 749 | } |
| 750 | |
| 751 | /* Helper function to delete an association. */ |
| 752 | static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, |
| 753 | struct sctp_association *asoc) |
| 754 | { |
| 755 | struct sock *sk = asoc->base.sk; |
| 756 | |
| 757 | /* If it is a non-temporary association belonging to a TCP-style |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 758 | * listening socket that is not closed, do not free it so that accept() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | * can pick it up later. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 760 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
| 762 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) |
| 763 | return; |
| 764 | |
| 765 | sctp_unhash_established(asoc); |
| 766 | sctp_association_free(asoc); |
| 767 | } |
| 768 | |
| 769 | /* |
| 770 | * ADDIP Section 4.1 ASCONF Chunk Procedures |
| 771 | * A4) Start a T-4 RTO timer, using the RTO value of the selected |
| 772 | * destination address (we use active path instead of primary path just |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 773 | * because primary path may be inactive. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | */ |
| 775 | static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, |
| 776 | struct sctp_association *asoc, |
| 777 | struct sctp_chunk *chunk) |
| 778 | { |
| 779 | struct sctp_transport *t; |
| 780 | |
| 781 | t = asoc->peer.active_path; |
| 782 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
| 783 | chunk->transport = t; |
| 784 | } |
| 785 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 786 | /* Process an incoming Operation Error Chunk. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, |
| 788 | struct sctp_association *asoc, |
| 789 | struct sctp_chunk *chunk) |
| 790 | { |
| 791 | struct sctp_operr_chunk *operr_chunk; |
| 792 | struct sctp_errhdr *err_hdr; |
| 793 | |
| 794 | operr_chunk = (struct sctp_operr_chunk *)chunk->chunk_hdr; |
| 795 | err_hdr = &operr_chunk->err_hdr; |
| 796 | |
| 797 | switch (err_hdr->cause) { |
| 798 | case SCTP_ERROR_UNKNOWN_CHUNK: |
| 799 | { |
| 800 | struct sctp_chunkhdr *unk_chunk_hdr; |
| 801 | |
| 802 | unk_chunk_hdr = (struct sctp_chunkhdr *)err_hdr->variable; |
| 803 | switch (unk_chunk_hdr->type) { |
| 804 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an |
| 805 | * ERROR chunk reporting that it did not recognized the ASCONF |
| 806 | * chunk type, the sender of the ASCONF MUST NOT send any |
| 807 | * further ASCONF chunks and MUST stop its T-4 timer. |
| 808 | */ |
| 809 | case SCTP_CID_ASCONF: |
| 810 | asoc->peer.asconf_capable = 0; |
| 811 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, |
| 812 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
| 813 | break; |
| 814 | default: |
| 815 | break; |
| 816 | } |
| 817 | break; |
| 818 | } |
| 819 | default: |
| 820 | break; |
| 821 | } |
| 822 | } |
| 823 | |
| 824 | /* Process variable FWDTSN chunk information. */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 825 | static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | struct sctp_chunk *chunk) |
| 827 | { |
| 828 | struct sctp_fwdtsn_skip *skip; |
| 829 | /* Walk through all the skipped SSNs */ |
| 830 | sctp_walk_fwdtsn(skip, chunk) { |
| 831 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); |
| 832 | } |
| 833 | |
| 834 | return; |
| 835 | } |
| 836 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 837 | /* Helper function to remove the association non-primary peer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | * transports. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 839 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
| 841 | { |
| 842 | struct sctp_transport *t; |
| 843 | struct list_head *pos; |
| 844 | struct list_head *temp; |
| 845 | |
| 846 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 847 | t = list_entry(pos, struct sctp_transport, transports); |
Al Viro | 5f242a1 | 2006-11-20 17:05:23 -0800 | [diff] [blame] | 848 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 849 | &asoc->peer.primary_addr)) { |
Al Viro | 38a0314 | 2006-11-20 17:06:45 -0800 | [diff] [blame] | 850 | sctp_assoc_del_peer(asoc, &t->ipaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | } |
| 852 | } |
| 853 | |
| 854 | return; |
| 855 | } |
| 856 | |
Sridhar Samudrala | 8de8c87 | 2006-05-19 10:58:12 -0700 | [diff] [blame] | 857 | /* Helper function to set sk_err on a 1-1 style socket. */ |
| 858 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) |
| 859 | { |
| 860 | struct sock *sk = asoc->base.sk; |
| 861 | |
| 862 | if (!sctp_style(sk, UDP)) |
| 863 | sk->sk_err = error; |
| 864 | } |
| 865 | |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 866 | /* Helper function to generate an association change event */ |
| 867 | static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands, |
| 868 | struct sctp_association *asoc, |
| 869 | u8 state) |
| 870 | { |
| 871 | struct sctp_ulpevent *ev; |
| 872 | |
| 873 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, |
| 874 | asoc->c.sinit_num_ostreams, |
| 875 | asoc->c.sinit_max_instreams, |
| 876 | NULL, GFP_ATOMIC); |
| 877 | if (ev) |
| 878 | sctp_ulpq_tail_event(&asoc->ulpq, ev); |
| 879 | } |
| 880 | |
| 881 | /* Helper function to generate an adaptation indication event */ |
| 882 | static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands, |
| 883 | struct sctp_association *asoc) |
| 884 | { |
| 885 | struct sctp_ulpevent *ev; |
| 886 | |
| 887 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); |
| 888 | |
| 889 | if (ev) |
| 890 | sctp_ulpq_tail_event(&asoc->ulpq, ev); |
| 891 | } |
| 892 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | /* These three macros allow us to pull the debugging code out of the |
| 894 | * main flow of sctp_do_sm() to keep attention focused on the real |
| 895 | * functionality there. |
| 896 | */ |
| 897 | #define DEBUG_PRE \ |
| 898 | SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \ |
| 899 | "ep %p, %s, %s, asoc %p[%s], %s\n", \ |
| 900 | ep, sctp_evttype_tbl[event_type], \ |
| 901 | (*debug_fn)(subtype), asoc, \ |
| 902 | sctp_state_tbl[state], state_fn->name) |
| 903 | |
| 904 | #define DEBUG_POST \ |
| 905 | SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \ |
| 906 | "asoc %p, status: %s\n", \ |
| 907 | asoc, sctp_status_tbl[status]) |
| 908 | |
| 909 | #define DEBUG_POST_SFX \ |
| 910 | SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \ |
| 911 | error, asoc, \ |
| 912 | sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ |
| 913 | sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED]) |
| 914 | |
| 915 | /* |
| 916 | * This is the master state machine processing function. |
| 917 | * |
| 918 | * If you want to understand all of lksctp, this is a |
| 919 | * good place to start. |
| 920 | */ |
| 921 | int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype, |
| 922 | sctp_state_t state, |
| 923 | struct sctp_endpoint *ep, |
| 924 | struct sctp_association *asoc, |
| 925 | void *event_arg, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 926 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | { |
| 928 | sctp_cmd_seq_t commands; |
| 929 | const sctp_sm_table_entry_t *state_fn; |
| 930 | sctp_disposition_t status; |
| 931 | int error = 0; |
| 932 | typedef const char *(printfn_t)(sctp_subtype_t); |
| 933 | |
| 934 | static printfn_t *table[] = { |
| 935 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, |
| 936 | }; |
| 937 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; |
| 938 | |
| 939 | /* Look up the state function, run it, and then process the |
| 940 | * side effects. These three steps are the heart of lksctp. |
| 941 | */ |
| 942 | state_fn = sctp_sm_lookup_event(event_type, state, subtype); |
| 943 | |
| 944 | sctp_init_cmd_seq(&commands); |
| 945 | |
| 946 | DEBUG_PRE; |
| 947 | status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands); |
| 948 | DEBUG_POST; |
| 949 | |
| 950 | error = sctp_side_effects(event_type, subtype, state, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 951 | ep, asoc, event_arg, status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | &commands, gfp); |
| 953 | DEBUG_POST_SFX; |
| 954 | |
| 955 | return error; |
| 956 | } |
| 957 | |
| 958 | #undef DEBUG_PRE |
| 959 | #undef DEBUG_POST |
| 960 | |
| 961 | /***************************************************************** |
| 962 | * This the master state function side effect processing function. |
| 963 | *****************************************************************/ |
| 964 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, |
| 965 | sctp_state_t state, |
| 966 | struct sctp_endpoint *ep, |
| 967 | struct sctp_association *asoc, |
| 968 | void *event_arg, |
| 969 | sctp_disposition_t status, |
| 970 | sctp_cmd_seq_t *commands, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 971 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | { |
| 973 | int error; |
| 974 | |
| 975 | /* FIXME - Most of the dispositions left today would be categorized |
| 976 | * as "exceptional" dispositions. For those dispositions, it |
| 977 | * may not be proper to run through any of the commands at all. |
| 978 | * For example, the command interpreter might be run only with |
| 979 | * disposition SCTP_DISPOSITION_CONSUME. |
| 980 | */ |
| 981 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, |
| 982 | ep, asoc, |
| 983 | event_arg, status, |
| 984 | commands, gfp))) |
| 985 | goto bail; |
| 986 | |
| 987 | switch (status) { |
| 988 | case SCTP_DISPOSITION_DISCARD: |
| 989 | SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, " |
| 990 | "event_type %d, event_id %d\n", |
| 991 | state, event_type, subtype.chunk); |
| 992 | break; |
| 993 | |
| 994 | case SCTP_DISPOSITION_NOMEM: |
| 995 | /* We ran out of memory, so we need to discard this |
| 996 | * packet. |
| 997 | */ |
| 998 | /* BUG--we should now recover some memory, probably by |
| 999 | * reneging... |
| 1000 | */ |
| 1001 | error = -ENOMEM; |
| 1002 | break; |
| 1003 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1004 | case SCTP_DISPOSITION_DELETE_TCB: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | /* This should now be a command. */ |
| 1006 | break; |
| 1007 | |
| 1008 | case SCTP_DISPOSITION_CONSUME: |
| 1009 | case SCTP_DISPOSITION_ABORT: |
| 1010 | /* |
| 1011 | * We should no longer have much work to do here as the |
| 1012 | * real work has been done as explicit commands above. |
| 1013 | */ |
| 1014 | break; |
| 1015 | |
| 1016 | case SCTP_DISPOSITION_VIOLATION: |
Wei Yongjun | d99fa42 | 2007-08-27 11:19:24 +0800 | [diff] [blame] | 1017 | if (net_ratelimit()) |
| 1018 | printk(KERN_ERR "sctp protocol violation state %d " |
| 1019 | "chunkid %d\n", state, subtype.chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | break; |
| 1021 | |
| 1022 | case SCTP_DISPOSITION_NOT_IMPL: |
| 1023 | printk(KERN_WARNING "sctp unimplemented feature in state %d, " |
| 1024 | "event_type %d, event_id %d\n", |
| 1025 | state, event_type, subtype.chunk); |
| 1026 | break; |
| 1027 | |
| 1028 | case SCTP_DISPOSITION_BUG: |
| 1029 | printk(KERN_ERR "sctp bug in state %d, " |
| 1030 | "event_type %d, event_id %d\n", |
| 1031 | state, event_type, subtype.chunk); |
| 1032 | BUG(); |
| 1033 | break; |
| 1034 | |
| 1035 | default: |
| 1036 | printk(KERN_ERR "sctp impossible disposition %d " |
| 1037 | "in state %d, event_type %d, event_id %d\n", |
| 1038 | status, state, event_type, subtype.chunk); |
| 1039 | BUG(); |
| 1040 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 1041 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | |
| 1043 | bail: |
| 1044 | return error; |
| 1045 | } |
| 1046 | |
| 1047 | /******************************************************************** |
| 1048 | * 2nd Level Abstractions |
| 1049 | ********************************************************************/ |
| 1050 | |
| 1051 | /* This is the side-effect interpreter. */ |
| 1052 | static int sctp_cmd_interpreter(sctp_event_t event_type, |
| 1053 | sctp_subtype_t subtype, |
| 1054 | sctp_state_t state, |
| 1055 | struct sctp_endpoint *ep, |
| 1056 | struct sctp_association *asoc, |
| 1057 | void *event_arg, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1058 | sctp_disposition_t status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | sctp_cmd_seq_t *commands, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1060 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | { |
| 1062 | int error = 0; |
| 1063 | int force; |
| 1064 | sctp_cmd_t *cmd; |
| 1065 | struct sctp_chunk *new_obj; |
| 1066 | struct sctp_chunk *chunk = NULL; |
| 1067 | struct sctp_packet *packet; |
| 1068 | struct list_head *pos; |
| 1069 | struct timer_list *timer; |
| 1070 | unsigned long timeout; |
| 1071 | struct sctp_transport *t; |
| 1072 | struct sctp_sackhdr sackh; |
| 1073 | int local_cork = 0; |
| 1074 | |
| 1075 | if (SCTP_EVENT_T_TIMEOUT != event_type) |
| 1076 | chunk = (struct sctp_chunk *) event_arg; |
| 1077 | |
| 1078 | /* Note: This whole file is a huge candidate for rework. |
| 1079 | * For example, each command could either have its own handler, so |
| 1080 | * the loop would look like: |
| 1081 | * while (cmds) |
| 1082 | * cmd->handle(x, y, z) |
| 1083 | * --jgrimm |
| 1084 | */ |
| 1085 | while (NULL != (cmd = sctp_next_cmd(commands))) { |
| 1086 | switch (cmd->verb) { |
| 1087 | case SCTP_CMD_NOP: |
| 1088 | /* Do nothing. */ |
| 1089 | break; |
| 1090 | |
| 1091 | case SCTP_CMD_NEW_ASOC: |
| 1092 | /* Register a new association. */ |
| 1093 | if (local_cork) { |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1094 | sctp_outq_uncork(&asoc->outqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | local_cork = 0; |
| 1096 | } |
| 1097 | asoc = cmd->obj.ptr; |
| 1098 | /* Register with the endpoint. */ |
| 1099 | sctp_endpoint_add_asoc(ep, asoc); |
| 1100 | sctp_hash_established(asoc); |
| 1101 | break; |
| 1102 | |
| 1103 | case SCTP_CMD_UPDATE_ASSOC: |
| 1104 | sctp_assoc_update(asoc, cmd->obj.ptr); |
| 1105 | break; |
| 1106 | |
| 1107 | case SCTP_CMD_PURGE_OUTQUEUE: |
| 1108 | sctp_outq_teardown(&asoc->outqueue); |
| 1109 | break; |
| 1110 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1111 | case SCTP_CMD_DELETE_TCB: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | if (local_cork) { |
| 1113 | sctp_outq_uncork(&asoc->outqueue); |
| 1114 | local_cork = 0; |
| 1115 | } |
| 1116 | /* Delete the current association. */ |
| 1117 | sctp_cmd_delete_tcb(commands, asoc); |
| 1118 | asoc = NULL; |
| 1119 | break; |
| 1120 | |
| 1121 | case SCTP_CMD_NEW_STATE: |
| 1122 | /* Enter a new state. */ |
| 1123 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); |
| 1124 | break; |
| 1125 | |
| 1126 | case SCTP_CMD_REPORT_TSN: |
| 1127 | /* Record the arrival of a TSN. */ |
| 1128 | sctp_tsnmap_mark(&asoc->peer.tsn_map, cmd->obj.u32); |
| 1129 | break; |
| 1130 | |
| 1131 | case SCTP_CMD_REPORT_FWDTSN: |
| 1132 | /* Move the Cumulattive TSN Ack ahead. */ |
| 1133 | sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); |
| 1134 | |
Vlad Yasevich | ea2dfb3 | 2007-07-13 17:01:19 -0400 | [diff] [blame] | 1135 | /* purge the fragmentation queue */ |
| 1136 | sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32); |
| 1137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | /* Abort any in progress partial delivery. */ |
| 1139 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); |
| 1140 | break; |
| 1141 | |
| 1142 | case SCTP_CMD_PROCESS_FWDTSN: |
| 1143 | sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr); |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1144 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | |
| 1146 | case SCTP_CMD_GEN_SACK: |
| 1147 | /* Generate a Selective ACK. |
| 1148 | * The argument tells us whether to just count |
| 1149 | * the packet and MAYBE generate a SACK, or |
| 1150 | * force a SACK out. |
| 1151 | */ |
| 1152 | force = cmd->obj.i32; |
| 1153 | error = sctp_gen_sack(asoc, force, commands); |
| 1154 | break; |
| 1155 | |
| 1156 | case SCTP_CMD_PROCESS_SACK: |
| 1157 | /* Process an inbound SACK. */ |
| 1158 | error = sctp_cmd_process_sack(commands, asoc, |
| 1159 | cmd->obj.ptr); |
| 1160 | break; |
| 1161 | |
| 1162 | case SCTP_CMD_GEN_INIT_ACK: |
| 1163 | /* Generate an INIT ACK chunk. */ |
| 1164 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, |
| 1165 | 0); |
| 1166 | if (!new_obj) |
| 1167 | goto nomem; |
| 1168 | |
| 1169 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
| 1170 | SCTP_CHUNK(new_obj)); |
| 1171 | break; |
| 1172 | |
| 1173 | case SCTP_CMD_PEER_INIT: |
| 1174 | /* Process a unified INIT from the peer. |
| 1175 | * Note: Only used during INIT-ACK processing. If |
| 1176 | * there is an error just return to the outter |
| 1177 | * layer which will bail. |
| 1178 | */ |
| 1179 | error = sctp_cmd_process_init(commands, asoc, chunk, |
| 1180 | cmd->obj.ptr, gfp); |
| 1181 | break; |
| 1182 | |
| 1183 | case SCTP_CMD_GEN_COOKIE_ECHO: |
| 1184 | /* Generate a COOKIE ECHO chunk. */ |
| 1185 | new_obj = sctp_make_cookie_echo(asoc, chunk); |
| 1186 | if (!new_obj) { |
| 1187 | if (cmd->obj.ptr) |
| 1188 | sctp_chunk_free(cmd->obj.ptr); |
| 1189 | goto nomem; |
| 1190 | } |
| 1191 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
| 1192 | SCTP_CHUNK(new_obj)); |
| 1193 | |
| 1194 | /* If there is an ERROR chunk to be sent along with |
| 1195 | * the COOKIE_ECHO, send it, too. |
| 1196 | */ |
| 1197 | if (cmd->obj.ptr) |
| 1198 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
| 1199 | SCTP_CHUNK(cmd->obj.ptr)); |
| 1200 | |
| 1201 | /* FIXME - Eventually come up with a cleaner way to |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1202 | * enabling COOKIE-ECHO + DATA bundling during |
| 1203 | * multihoming stale cookie scenarios, the following |
| 1204 | * command plays with asoc->peer.retran_path to |
| 1205 | * avoid the problem of sending the COOKIE-ECHO and |
| 1206 | * DATA in different paths, which could result |
| 1207 | * in the association being ABORTed if the DATA chunk |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | * is processed first by the server. Checking the |
| 1209 | * init error counter simply causes this command |
| 1210 | * to be executed only during failed attempts of |
| 1211 | * association establishment. |
| 1212 | */ |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1213 | if ((asoc->peer.retran_path != |
| 1214 | asoc->peer.primary_path) && |
| 1215 | (asoc->init_err_counter > 0)) { |
| 1216 | sctp_add_cmd_sf(commands, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1217 | SCTP_CMD_FORCE_PRIM_RETRAN, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | SCTP_NULL()); |
| 1219 | } |
| 1220 | |
| 1221 | break; |
| 1222 | |
| 1223 | case SCTP_CMD_GEN_SHUTDOWN: |
| 1224 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. |
| 1225 | * Reset error counts. |
| 1226 | */ |
| 1227 | asoc->overall_error_count = 0; |
| 1228 | |
| 1229 | /* Generate a SHUTDOWN chunk. */ |
| 1230 | new_obj = sctp_make_shutdown(asoc, chunk); |
| 1231 | if (!new_obj) |
| 1232 | goto nomem; |
| 1233 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
| 1234 | SCTP_CHUNK(new_obj)); |
| 1235 | break; |
| 1236 | |
| 1237 | case SCTP_CMD_CHUNK_ULP: |
| 1238 | /* Send a chunk to the sockets layer. */ |
| 1239 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", |
| 1240 | "chunk_up:", cmd->obj.ptr, |
| 1241 | "ulpq:", &asoc->ulpq); |
| 1242 | sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr, |
| 1243 | GFP_ATOMIC); |
| 1244 | break; |
| 1245 | |
| 1246 | case SCTP_CMD_EVENT_ULP: |
| 1247 | /* Send a notification to the sockets layer. */ |
| 1248 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", |
| 1249 | "event_up:",cmd->obj.ptr, |
| 1250 | "ulpq:",&asoc->ulpq); |
| 1251 | sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr); |
| 1252 | break; |
| 1253 | |
| 1254 | case SCTP_CMD_REPLY: |
| 1255 | /* If an caller has not already corked, do cork. */ |
| 1256 | if (!asoc->outqueue.cork) { |
| 1257 | sctp_outq_cork(&asoc->outqueue); |
| 1258 | local_cork = 1; |
| 1259 | } |
| 1260 | /* Send a chunk to our peer. */ |
| 1261 | error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr); |
| 1262 | break; |
| 1263 | |
| 1264 | case SCTP_CMD_SEND_PKT: |
| 1265 | /* Send a full packet to our peer. */ |
| 1266 | packet = cmd->obj.ptr; |
| 1267 | sctp_packet_transmit(packet); |
| 1268 | sctp_ootb_pkt_free(packet); |
| 1269 | break; |
| 1270 | |
Vlad Yasevich | b6157d8 | 2007-10-24 15:59:16 -0400 | [diff] [blame] | 1271 | case SCTP_CMD_T1_RETRAN: |
| 1272 | /* Mark a transport for retransmission. */ |
| 1273 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, |
| 1274 | SCTP_RTXR_T1_RTX); |
| 1275 | break; |
| 1276 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | case SCTP_CMD_RETRAN: |
| 1278 | /* Mark a transport for retransmission. */ |
| 1279 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, |
| 1280 | SCTP_RTXR_T3_RTX); |
| 1281 | break; |
| 1282 | |
| 1283 | case SCTP_CMD_TRANSMIT: |
| 1284 | /* Kick start transmission. */ |
| 1285 | error = sctp_outq_uncork(&asoc->outqueue); |
| 1286 | local_cork = 0; |
| 1287 | break; |
| 1288 | |
| 1289 | case SCTP_CMD_ECN_CE: |
| 1290 | /* Do delayed CE processing. */ |
| 1291 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); |
| 1292 | break; |
| 1293 | |
| 1294 | case SCTP_CMD_ECN_ECNE: |
| 1295 | /* Do delayed ECNE processing. */ |
| 1296 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, |
| 1297 | chunk); |
| 1298 | if (new_obj) |
| 1299 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
| 1300 | SCTP_CHUNK(new_obj)); |
| 1301 | break; |
| 1302 | |
| 1303 | case SCTP_CMD_ECN_CWR: |
| 1304 | /* Do delayed CWR processing. */ |
| 1305 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); |
| 1306 | break; |
| 1307 | |
| 1308 | case SCTP_CMD_SETUP_T2: |
| 1309 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr); |
| 1310 | break; |
| 1311 | |
| 1312 | case SCTP_CMD_TIMER_START: |
| 1313 | timer = &asoc->timers[cmd->obj.to]; |
| 1314 | timeout = asoc->timeouts[cmd->obj.to]; |
Kris Katterjohn | 09a6266 | 2006-01-08 22:24:28 -0800 | [diff] [blame] | 1315 | BUG_ON(!timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | |
| 1317 | timer->expires = jiffies + timeout; |
| 1318 | sctp_association_hold(asoc); |
| 1319 | add_timer(timer); |
| 1320 | break; |
| 1321 | |
| 1322 | case SCTP_CMD_TIMER_RESTART: |
| 1323 | timer = &asoc->timers[cmd->obj.to]; |
| 1324 | timeout = asoc->timeouts[cmd->obj.to]; |
| 1325 | if (!mod_timer(timer, jiffies + timeout)) |
| 1326 | sctp_association_hold(asoc); |
| 1327 | break; |
| 1328 | |
| 1329 | case SCTP_CMD_TIMER_STOP: |
| 1330 | timer = &asoc->timers[cmd->obj.to]; |
| 1331 | if (timer_pending(timer) && del_timer(timer)) |
| 1332 | sctp_association_put(asoc); |
| 1333 | break; |
| 1334 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1335 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
| 1336 | chunk = cmd->obj.ptr; |
| 1337 | t = sctp_assoc_choose_init_transport(asoc); |
| 1338 | asoc->init_last_sent_to = t; |
| 1339 | chunk->transport = t; |
| 1340 | t->init_sent_count++; |
| 1341 | break; |
| 1342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | case SCTP_CMD_INIT_RESTART: |
| 1344 | /* Do the needed accounting and updates |
| 1345 | * associated with restarting an initialization |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1346 | * timer. Only multiply the timeout by two if |
| 1347 | * all transports have been tried at the current |
| 1348 | * timeout. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | */ |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1350 | t = asoc->init_last_sent_to; |
| 1351 | asoc->init_err_counter++; |
| 1352 | |
| 1353 | if (t->init_sent_count > (asoc->init_cycle + 1)) { |
| 1354 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] *= 2; |
| 1355 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] > |
| 1356 | asoc->max_init_timeo) { |
| 1357 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = |
| 1358 | asoc->max_init_timeo; |
| 1359 | } |
| 1360 | asoc->init_cycle++; |
| 1361 | SCTP_DEBUG_PRINTK( |
| 1362 | "T1 INIT Timeout adjustment" |
| 1363 | " init_err_counter: %d" |
| 1364 | " cycle: %d" |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1365 | " timeout: %ld\n", |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1366 | asoc->init_err_counter, |
| 1367 | asoc->init_cycle, |
| 1368 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT]); |
| 1369 | } |
| 1370 | |
| 1371 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
| 1372 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); |
| 1373 | break; |
| 1374 | |
| 1375 | case SCTP_CMD_COOKIEECHO_RESTART: |
| 1376 | /* Do the needed accounting and updates |
| 1377 | * associated with restarting an initialization |
| 1378 | * timer. Only multiply the timeout by two if |
| 1379 | * all transports have been tried at the current |
| 1380 | * timeout. |
| 1381 | */ |
| 1382 | asoc->init_err_counter++; |
| 1383 | |
| 1384 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] *= 2; |
| 1385 | if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] > |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | asoc->max_init_timeo) { |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1387 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | asoc->max_init_timeo; |
| 1389 | } |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1390 | SCTP_DEBUG_PRINTK( |
| 1391 | "T1 COOKIE Timeout adjustment" |
| 1392 | " init_err_counter: %d" |
Vlad Yasevich | 8116ffa | 2006-01-17 11:55:17 -0800 | [diff] [blame] | 1393 | " timeout: %ld\n", |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1394 | asoc->init_err_counter, |
| 1395 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | |
| 1397 | /* If we've sent any data bundled with |
| 1398 | * COOKIE-ECHO we need to resend. |
| 1399 | */ |
| 1400 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
| 1401 | t = list_entry(pos, struct sctp_transport, |
| 1402 | transports); |
Vlad Yasevich | b6157d8 | 2007-10-24 15:59:16 -0400 | [diff] [blame] | 1403 | sctp_retransmit_mark(&asoc->outqueue, t, |
| 1404 | SCTP_RTXR_T1_RTX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | } |
| 1406 | |
| 1407 | sctp_add_cmd_sf(commands, |
| 1408 | SCTP_CMD_TIMER_RESTART, |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1409 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | break; |
| 1411 | |
| 1412 | case SCTP_CMD_INIT_FAILED: |
Al Viro | dc251b2 | 2006-11-20 17:00:44 -0800 | [diff] [blame] | 1413 | sctp_cmd_init_failed(commands, asoc, cmd->obj.err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | break; |
| 1415 | |
| 1416 | case SCTP_CMD_ASSOC_FAILED: |
| 1417 | sctp_cmd_assoc_failed(commands, asoc, event_type, |
Al Viro | 5be291f | 2006-11-20 17:01:06 -0800 | [diff] [blame] | 1418 | subtype, chunk, cmd->obj.err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | break; |
| 1420 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1421 | case SCTP_CMD_INIT_COUNTER_INC: |
| 1422 | asoc->init_err_counter++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | break; |
| 1424 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1425 | case SCTP_CMD_INIT_COUNTER_RESET: |
| 1426 | asoc->init_err_counter = 0; |
| 1427 | asoc->init_cycle = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | break; |
| 1429 | |
| 1430 | case SCTP_CMD_REPORT_DUP: |
| 1431 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, |
| 1432 | cmd->obj.u32); |
| 1433 | break; |
| 1434 | |
| 1435 | case SCTP_CMD_REPORT_BAD_TAG: |
| 1436 | SCTP_DEBUG_PRINTK("vtag mismatch!\n"); |
| 1437 | break; |
| 1438 | |
| 1439 | case SCTP_CMD_STRIKE: |
| 1440 | /* Mark one strike against a transport. */ |
| 1441 | sctp_do_8_2_transport_strike(asoc, cmd->obj.transport); |
| 1442 | break; |
| 1443 | |
| 1444 | case SCTP_CMD_TRANSPORT_RESET: |
| 1445 | t = cmd->obj.transport; |
| 1446 | sctp_cmd_transport_reset(commands, asoc, t); |
| 1447 | break; |
| 1448 | |
| 1449 | case SCTP_CMD_TRANSPORT_ON: |
| 1450 | t = cmd->obj.transport; |
| 1451 | sctp_cmd_transport_on(commands, asoc, t, chunk); |
| 1452 | break; |
| 1453 | |
| 1454 | case SCTP_CMD_HB_TIMERS_START: |
| 1455 | sctp_cmd_hb_timers_start(commands, asoc); |
| 1456 | break; |
| 1457 | |
| 1458 | case SCTP_CMD_HB_TIMER_UPDATE: |
| 1459 | t = cmd->obj.transport; |
| 1460 | sctp_cmd_hb_timer_update(commands, asoc, t); |
| 1461 | break; |
| 1462 | |
| 1463 | case SCTP_CMD_HB_TIMERS_STOP: |
| 1464 | sctp_cmd_hb_timers_stop(commands, asoc); |
| 1465 | break; |
| 1466 | |
| 1467 | case SCTP_CMD_REPORT_ERROR: |
| 1468 | error = cmd->obj.error; |
| 1469 | break; |
| 1470 | |
| 1471 | case SCTP_CMD_PROCESS_CTSN: |
| 1472 | /* Dummy up a SACK for processing. */ |
Al Viro | 2178eda | 2006-11-20 17:26:53 -0800 | [diff] [blame] | 1473 | sackh.cum_tsn_ack = cmd->obj.be32; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | sackh.a_rwnd = 0; |
| 1475 | sackh.num_gap_ack_blocks = 0; |
| 1476 | sackh.num_dup_tsns = 0; |
| 1477 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
| 1478 | SCTP_SACKH(&sackh)); |
| 1479 | break; |
| 1480 | |
| 1481 | case SCTP_CMD_DISCARD_PACKET: |
| 1482 | /* We need to discard the whole packet. */ |
| 1483 | chunk->pdiscard = 1; |
| 1484 | break; |
| 1485 | |
| 1486 | case SCTP_CMD_RTO_PENDING: |
| 1487 | t = cmd->obj.transport; |
| 1488 | t->rto_pending = 1; |
| 1489 | break; |
| 1490 | |
| 1491 | case SCTP_CMD_PART_DELIVER: |
| 1492 | sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr, |
| 1493 | GFP_ATOMIC); |
| 1494 | break; |
| 1495 | |
| 1496 | case SCTP_CMD_RENEGE: |
| 1497 | sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr, |
| 1498 | GFP_ATOMIC); |
| 1499 | break; |
| 1500 | |
| 1501 | case SCTP_CMD_SETUP_T4: |
| 1502 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr); |
| 1503 | break; |
| 1504 | |
| 1505 | case SCTP_CMD_PROCESS_OPERR: |
| 1506 | sctp_cmd_process_operr(commands, asoc, chunk); |
| 1507 | break; |
| 1508 | case SCTP_CMD_CLEAR_INIT_TAG: |
| 1509 | asoc->peer.i.init_tag = 0; |
| 1510 | break; |
| 1511 | case SCTP_CMD_DEL_NON_PRIMARY: |
| 1512 | sctp_cmd_del_non_primary(asoc); |
| 1513 | break; |
| 1514 | case SCTP_CMD_T3_RTX_TIMERS_STOP: |
| 1515 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); |
| 1516 | break; |
| 1517 | case SCTP_CMD_FORCE_PRIM_RETRAN: |
| 1518 | t = asoc->peer.retran_path; |
| 1519 | asoc->peer.retran_path = asoc->peer.primary_path; |
| 1520 | error = sctp_outq_uncork(&asoc->outqueue); |
| 1521 | local_cork = 0; |
| 1522 | asoc->peer.retran_path = t; |
| 1523 | break; |
Sridhar Samudrala | 8de8c87 | 2006-05-19 10:58:12 -0700 | [diff] [blame] | 1524 | case SCTP_CMD_SET_SK_ERR: |
| 1525 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); |
| 1526 | break; |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1527 | case SCTP_CMD_ASSOC_CHANGE: |
| 1528 | sctp_cmd_assoc_change(commands, asoc, |
| 1529 | cmd->obj.u8); |
| 1530 | break; |
| 1531 | case SCTP_CMD_ADAPTATION_IND: |
| 1532 | sctp_cmd_adaptation_ind(commands, asoc); |
| 1533 | break; |
| 1534 | |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 1535 | case SCTP_CMD_ASSOC_SHKEY: |
| 1536 | error = sctp_auth_asoc_init_active_key(asoc, |
| 1537 | GFP_ATOMIC); |
| 1538 | break; |
| 1539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | default: |
| 1541 | printk(KERN_WARNING "Impossible command: %u, %p\n", |
| 1542 | cmd->verb, cmd->obj.ptr); |
| 1543 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 1544 | } |
| 1545 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | if (error) |
| 1547 | break; |
| 1548 | } |
| 1549 | |
| 1550 | out: |
| 1551 | if (local_cork) |
| 1552 | sctp_outq_uncork(&asoc->outqueue); |
| 1553 | return error; |
| 1554 | nomem: |
| 1555 | error = -ENOMEM; |
| 1556 | goto out; |
| 1557 | } |
| 1558 | |