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, 64 sctp_disposition_t status, 65 sctp_cmd_seq_t *commands, 66 gfp_t gfp); 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, 74 gfp_t gfp); 75 76 /******************************************************************** 77 * Helper functions 78 ********************************************************************/ 79 80 /* A helper function for delayed processing of INET ECN CE bit. */ 81 static void sctp_do_ecn_ce_work(struct sctp_association *asoc, 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; 160 struct sctp_transport *trans = asoc->peer.last_data_from; 161 int error = 0; 162 163 if (force || 164 (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || 165 (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) 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 */ 181 if (max_tsn_seen != ctsn) 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; 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) 202 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = 203 trans->sackdelay; 204 else 205 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = 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)); 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; 219 220 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); 221 222 /* Stop the SACK timer. */ 223 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, 224 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); 225 } 226 227 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 { 341 struct sctp_association *asoc = (struct sctp_association *)data; 342 sctp_generate_timeout_event(asoc, 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); 382 383 if (error) 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, 406 NULL, 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 */ 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++; 438 439 if (transport->state != SCTP_INACTIVE && 440 (transport->error_count++ >= transport->pathmaxrxt)) { 441 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p", 442 " transport IP: port:%d failed.\n", 443 asoc, 444 (&transport->ipaddr), 445 ntohs(transport->ipaddr.v4.sin_port)); 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 */ 456 transport->rto = min((transport->rto * 2), transport->asoc->rto_max); 457 } 458 459 /* Worker routine to handle INIT command failure. */ 460 static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, 461 struct sctp_association *asoc, 462 unsigned error) 463 { 464 struct sctp_ulpevent *event; 465 466 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC, 467 (__u16)error, 0, 0, 468 GFP_ATOMIC); 469 470 if (event) 471 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, 472 SCTP_ULPEVENT(event)); 473 474 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, 475 SCTP_STATE(SCTP_STATE_CLOSED)); 476 477 /* SEND_FAILED sent later when cleaning up the association. */ 478 asoc->outqueue.error = error; 479 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); 480 } 481 482 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ 483 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, 484 struct sctp_association *asoc, 485 sctp_event_t event_type, 486 sctp_subtype_t subtype, 487 struct sctp_chunk *chunk, 488 unsigned error) 489 { 490 struct sctp_ulpevent *event; 491 492 /* Cancel any partial delivery in progress. */ 493 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); 494 495 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, 496 (__u16)error, 0, 0, 497 GFP_ATOMIC); 498 if (event) 499 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, 500 SCTP_ULPEVENT(event)); 501 502 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, 503 SCTP_STATE(SCTP_STATE_CLOSED)); 504 505 /* SEND_FAILED sent later when cleaning up the association. */ 506 asoc->outqueue.error = error; 507 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); 508 } 509 510 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT 511 * inside the cookie. In reality, this is only used for INIT-ACK processing 512 * since all other cases use "temporary" associations and can do all 513 * their work in statefuns directly. 514 */ 515 static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, 516 struct sctp_association *asoc, 517 struct sctp_chunk *chunk, 518 sctp_init_chunk_t *peer_init, 519 gfp_t gfp) 520 { 521 int error; 522 523 /* We only process the init as a sideeffect in a single 524 * case. This is when we process the INIT-ACK. If we 525 * fail during INIT processing (due to malloc problems), 526 * just return the error and stop processing the stack. 527 */ 528 if (!sctp_process_init(asoc, chunk->chunk_hdr->type, 529 sctp_source(chunk), peer_init, gfp)) 530 error = -ENOMEM; 531 else 532 error = 0; 533 534 return error; 535 } 536 537 /* Helper function to break out starting up of heartbeat timers. */ 538 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, 539 struct sctp_association *asoc) 540 { 541 struct sctp_transport *t; 542 struct list_head *pos; 543 544 /* Start a heartbeat timer for each transport on the association. 545 * hold a reference on the transport to make sure none of 546 * the needed data structures go away. 547 */ 548 list_for_each(pos, &asoc->peer.transport_addr_list) { 549 t = list_entry(pos, struct sctp_transport, transports); 550 551 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) 552 sctp_transport_hold(t); 553 } 554 } 555 556 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, 557 struct sctp_association *asoc) 558 { 559 struct sctp_transport *t; 560 struct list_head *pos; 561 562 /* Stop all heartbeat timers. */ 563 564 list_for_each(pos, &asoc->peer.transport_addr_list) { 565 t = list_entry(pos, struct sctp_transport, transports); 566 if (del_timer(&t->hb_timer)) 567 sctp_transport_put(t); 568 } 569 } 570 571 /* Helper function to stop any pending T3-RTX timers */ 572 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, 573 struct sctp_association *asoc) 574 { 575 struct sctp_transport *t; 576 struct list_head *pos; 577 578 list_for_each(pos, &asoc->peer.transport_addr_list) { 579 t = list_entry(pos, struct sctp_transport, transports); 580 if (timer_pending(&t->T3_rtx_timer) && 581 del_timer(&t->T3_rtx_timer)) { 582 sctp_transport_put(t); 583 } 584 } 585 } 586 587 588 /* Helper function to update the heartbeat timer. */ 589 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, 590 struct sctp_association *asoc, 591 struct sctp_transport *t) 592 { 593 /* Update the heartbeat timer. */ 594 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) 595 sctp_transport_hold(t); 596 } 597 598 /* Helper function to handle the reception of an HEARTBEAT ACK. */ 599 static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, 600 struct sctp_association *asoc, 601 struct sctp_transport *t, 602 struct sctp_chunk *chunk) 603 { 604 sctp_sender_hb_info_t *hbinfo; 605 606 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the 607 * HEARTBEAT should clear the error counter of the destination 608 * transport address to which the HEARTBEAT was sent. 609 * The association's overall error count is also cleared. 610 */ 611 t->error_count = 0; 612 t->asoc->overall_error_count = 0; 613 614 /* Mark the destination transport address as active if it is not so 615 * marked. 616 */ 617 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) 618 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, 619 SCTP_HEARTBEAT_SUCCESS); 620 621 /* The receiver of the HEARTBEAT ACK should also perform an 622 * RTT measurement for that destination transport address 623 * using the time value carried in the HEARTBEAT ACK chunk. 624 * If the transport's rto_pending variable has been cleared, 625 * it was most likely due to a retransmit. However, we want 626 * to re-enable it to properly update the rto. 627 */ 628 if (t->rto_pending == 0) 629 t->rto_pending = 1; 630 631 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; 632 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); 633 634 /* Update the heartbeat timer. */ 635 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) 636 sctp_transport_hold(t); 637 } 638 639 /* Helper function to do a transport reset at the expiry of the hearbeat 640 * timer. 641 */ 642 static void sctp_cmd_transport_reset(sctp_cmd_seq_t *cmds, 643 struct sctp_association *asoc, 644 struct sctp_transport *t) 645 { 646 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); 647 648 /* Mark one strike against a transport. */ 649 sctp_do_8_2_transport_strike(asoc, t); 650 } 651 652 /* Helper function to process the process SACK command. */ 653 static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, 654 struct sctp_association *asoc, 655 struct sctp_sackhdr *sackh) 656 { 657 int err; 658 659 if (sctp_outq_sack(&asoc->outqueue, sackh)) { 660 /* There are no more TSNs awaiting SACK. */ 661 err = sctp_do_sm(SCTP_EVENT_T_OTHER, 662 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), 663 asoc->state, asoc->ep, asoc, NULL, 664 GFP_ATOMIC); 665 } else { 666 /* Windows may have opened, so we need 667 * to check if we have DATA to transmit 668 */ 669 err = sctp_outq_flush(&asoc->outqueue, 0); 670 } 671 672 return err; 673 } 674 675 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set 676 * the transport for a shutdown chunk. 677 */ 678 static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, 679 struct sctp_association *asoc, 680 struct sctp_chunk *chunk) 681 { 682 struct sctp_transport *t; 683 684 t = sctp_assoc_choose_shutdown_transport(asoc); 685 asoc->shutdown_last_sent_to = t; 686 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; 687 chunk->transport = t; 688 } 689 690 /* Helper function to change the state of an association. */ 691 static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, 692 struct sctp_association *asoc, 693 sctp_state_t state) 694 { 695 struct sock *sk = asoc->base.sk; 696 697 asoc->state = state; 698 699 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n", 700 asoc, sctp_state_tbl[state]); 701 702 if (sctp_style(sk, TCP)) { 703 /* Change the sk->sk_state of a TCP-style socket that has 704 * sucessfully completed a connect() call. 705 */ 706 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) 707 sk->sk_state = SCTP_SS_ESTABLISHED; 708 709 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ 710 if (sctp_state(asoc, SHUTDOWN_RECEIVED) && 711 sctp_sstate(sk, ESTABLISHED)) 712 sk->sk_shutdown |= RCV_SHUTDOWN; 713 } 714 715 if (sctp_state(asoc, COOKIE_WAIT)) { 716 /* Reset init timeouts since they may have been 717 * increased due to timer expirations. 718 */ 719 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = 720 asoc->rto_initial; 721 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = 722 asoc->rto_initial; 723 } 724 725 if (sctp_state(asoc, ESTABLISHED) || 726 sctp_state(asoc, CLOSED) || 727 sctp_state(asoc, SHUTDOWN_RECEIVED)) { 728 /* Wake up any processes waiting in the asoc's wait queue in 729 * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). 730 */ 731 if (waitqueue_active(&asoc->wait)) 732 wake_up_interruptible(&asoc->wait); 733 734 /* Wake up any processes waiting in the sk's sleep queue of 735 * a TCP-style or UDP-style peeled-off socket in 736 * sctp_wait_for_accept() or sctp_wait_for_packet(). 737 * For a UDP-style socket, the waiters are woken up by the 738 * notifications. 739 */ 740 if (!sctp_style(sk, UDP)) 741 sk->sk_state_change(sk); 742 } 743 } 744 745 /* Helper function to delete an association. */ 746 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, 747 struct sctp_association *asoc) 748 { 749 struct sock *sk = asoc->base.sk; 750 751 /* If it is a non-temporary association belonging to a TCP-style 752 * listening socket that is not closed, do not free it so that accept() 753 * can pick it up later. 754 */ 755 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && 756 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) 757 return; 758 759 sctp_unhash_established(asoc); 760 sctp_association_free(asoc); 761 } 762 763 /* 764 * ADDIP Section 4.1 ASCONF Chunk Procedures 765 * A4) Start a T-4 RTO timer, using the RTO value of the selected 766 * destination address (we use active path instead of primary path just 767 * because primary path may be inactive. 768 */ 769 static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, 770 struct sctp_association *asoc, 771 struct sctp_chunk *chunk) 772 { 773 struct sctp_transport *t; 774 775 t = asoc->peer.active_path; 776 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; 777 chunk->transport = t; 778 } 779 780 /* Process an incoming Operation Error Chunk. */ 781 static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, 782 struct sctp_association *asoc, 783 struct sctp_chunk *chunk) 784 { 785 struct sctp_operr_chunk *operr_chunk; 786 struct sctp_errhdr *err_hdr; 787 788 operr_chunk = (struct sctp_operr_chunk *)chunk->chunk_hdr; 789 err_hdr = &operr_chunk->err_hdr; 790 791 switch (err_hdr->cause) { 792 case SCTP_ERROR_UNKNOWN_CHUNK: 793 { 794 struct sctp_chunkhdr *unk_chunk_hdr; 795 796 unk_chunk_hdr = (struct sctp_chunkhdr *)err_hdr->variable; 797 switch (unk_chunk_hdr->type) { 798 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with an 799 * ERROR chunk reporting that it did not recognized the ASCONF 800 * chunk type, the sender of the ASCONF MUST NOT send any 801 * further ASCONF chunks and MUST stop its T-4 timer. 802 */ 803 case SCTP_CID_ASCONF: 804 asoc->peer.asconf_capable = 0; 805 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, 806 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); 807 break; 808 default: 809 break; 810 } 811 break; 812 } 813 default: 814 break; 815 } 816 } 817 818 /* Process variable FWDTSN chunk information. */ 819 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, 820 struct sctp_chunk *chunk) 821 { 822 struct sctp_fwdtsn_skip *skip; 823 /* Walk through all the skipped SSNs */ 824 sctp_walk_fwdtsn(skip, chunk) { 825 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); 826 } 827 828 return; 829 } 830 831 /* Helper function to remove the association non-primary peer 832 * transports. 833 */ 834 static void sctp_cmd_del_non_primary(struct sctp_association *asoc) 835 { 836 struct sctp_transport *t; 837 struct list_head *pos; 838 struct list_head *temp; 839 840 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 841 t = list_entry(pos, struct sctp_transport, transports); 842 if (!sctp_cmp_addr_exact(&t->ipaddr, 843 &asoc->peer.primary_addr)) { 844 sctp_assoc_del_peer(asoc, &t->ipaddr); 845 } 846 } 847 848 return; 849 } 850 851 /* Helper function to set sk_err on a 1-1 style socket. */ 852 static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) 853 { 854 struct sock *sk = asoc->base.sk; 855 856 if (!sctp_style(sk, UDP)) 857 sk->sk_err = error; 858 } 859 860 /* These three macros allow us to pull the debugging code out of the 861 * main flow of sctp_do_sm() to keep attention focused on the real 862 * functionality there. 863 */ 864 #define DEBUG_PRE \ 865 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \ 866 "ep %p, %s, %s, asoc %p[%s], %s\n", \ 867 ep, sctp_evttype_tbl[event_type], \ 868 (*debug_fn)(subtype), asoc, \ 869 sctp_state_tbl[state], state_fn->name) 870 871 #define DEBUG_POST \ 872 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \ 873 "asoc %p, status: %s\n", \ 874 asoc, sctp_status_tbl[status]) 875 876 #define DEBUG_POST_SFX \ 877 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \ 878 error, asoc, \ 879 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ 880 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED]) 881 882 /* 883 * This is the master state machine processing function. 884 * 885 * If you want to understand all of lksctp, this is a 886 * good place to start. 887 */ 888 int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype, 889 sctp_state_t state, 890 struct sctp_endpoint *ep, 891 struct sctp_association *asoc, 892 void *event_arg, 893 gfp_t gfp) 894 { 895 sctp_cmd_seq_t commands; 896 const sctp_sm_table_entry_t *state_fn; 897 sctp_disposition_t status; 898 int error = 0; 899 typedef const char *(printfn_t)(sctp_subtype_t); 900 901 static printfn_t *table[] = { 902 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, 903 }; 904 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; 905 906 /* Look up the state function, run it, and then process the 907 * side effects. These three steps are the heart of lksctp. 908 */ 909 state_fn = sctp_sm_lookup_event(event_type, state, subtype); 910 911 sctp_init_cmd_seq(&commands); 912 913 DEBUG_PRE; 914 status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands); 915 DEBUG_POST; 916 917 error = sctp_side_effects(event_type, subtype, state, 918 ep, asoc, event_arg, status, 919 &commands, gfp); 920 DEBUG_POST_SFX; 921 922 return error; 923 } 924 925 #undef DEBUG_PRE 926 #undef DEBUG_POST 927 928 /***************************************************************** 929 * This the master state function side effect processing function. 930 *****************************************************************/ 931 static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, 932 sctp_state_t state, 933 struct sctp_endpoint *ep, 934 struct sctp_association *asoc, 935 void *event_arg, 936 sctp_disposition_t status, 937 sctp_cmd_seq_t *commands, 938 gfp_t gfp) 939 { 940 int error; 941 942 /* FIXME - Most of the dispositions left today would be categorized 943 * as "exceptional" dispositions. For those dispositions, it 944 * may not be proper to run through any of the commands at all. 945 * For example, the command interpreter might be run only with 946 * disposition SCTP_DISPOSITION_CONSUME. 947 */ 948 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, 949 ep, asoc, 950 event_arg, status, 951 commands, gfp))) 952 goto bail; 953 954 switch (status) { 955 case SCTP_DISPOSITION_DISCARD: 956 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, " 957 "event_type %d, event_id %d\n", 958 state, event_type, subtype.chunk); 959 break; 960 961 case SCTP_DISPOSITION_NOMEM: 962 /* We ran out of memory, so we need to discard this 963 * packet. 964 */ 965 /* BUG--we should now recover some memory, probably by 966 * reneging... 967 */ 968 error = -ENOMEM; 969 break; 970 971 case SCTP_DISPOSITION_DELETE_TCB: 972 /* This should now be a command. */ 973 break; 974 975 case SCTP_DISPOSITION_CONSUME: 976 case SCTP_DISPOSITION_ABORT: 977 /* 978 * We should no longer have much work to do here as the 979 * real work has been done as explicit commands above. 980 */ 981 break; 982 983 case SCTP_DISPOSITION_VIOLATION: 984 printk(KERN_ERR "sctp protocol violation state %d " 985 "chunkid %d\n", state, subtype.chunk); 986 break; 987 988 case SCTP_DISPOSITION_NOT_IMPL: 989 printk(KERN_WARNING "sctp unimplemented feature in state %d, " 990 "event_type %d, event_id %d\n", 991 state, event_type, subtype.chunk); 992 break; 993 994 case SCTP_DISPOSITION_BUG: 995 printk(KERN_ERR "sctp bug in state %d, " 996 "event_type %d, event_id %d\n", 997 state, event_type, subtype.chunk); 998 BUG(); 999 break; 1000 1001 default: 1002 printk(KERN_ERR "sctp impossible disposition %d " 1003 "in state %d, event_type %d, event_id %d\n", 1004 status, state, event_type, subtype.chunk); 1005 BUG(); 1006 break; 1007 }; 1008 1009 bail: 1010 return error; 1011 } 1012 1013 /******************************************************************** 1014 * 2nd Level Abstractions 1015 ********************************************************************/ 1016 1017 /* This is the side-effect interpreter. */ 1018 static int sctp_cmd_interpreter(sctp_event_t event_type, 1019 sctp_subtype_t subtype, 1020 sctp_state_t state, 1021 struct sctp_endpoint *ep, 1022 struct sctp_association *asoc, 1023 void *event_arg, 1024 sctp_disposition_t status, 1025 sctp_cmd_seq_t *commands, 1026 gfp_t gfp) 1027 { 1028 int error = 0; 1029 int force; 1030 sctp_cmd_t *cmd; 1031 struct sctp_chunk *new_obj; 1032 struct sctp_chunk *chunk = NULL; 1033 struct sctp_packet *packet; 1034 struct list_head *pos; 1035 struct timer_list *timer; 1036 unsigned long timeout; 1037 struct sctp_transport *t; 1038 struct sctp_sackhdr sackh; 1039 int local_cork = 0; 1040 1041 if (SCTP_EVENT_T_TIMEOUT != event_type) 1042 chunk = (struct sctp_chunk *) event_arg; 1043 1044 /* Note: This whole file is a huge candidate for rework. 1045 * For example, each command could either have its own handler, so 1046 * the loop would look like: 1047 * while (cmds) 1048 * cmd->handle(x, y, z) 1049 * --jgrimm 1050 */ 1051 while (NULL != (cmd = sctp_next_cmd(commands))) { 1052 switch (cmd->verb) { 1053 case SCTP_CMD_NOP: 1054 /* Do nothing. */ 1055 break; 1056 1057 case SCTP_CMD_NEW_ASOC: 1058 /* Register a new association. */ 1059 if (local_cork) { 1060 sctp_outq_uncork(&asoc->outqueue); 1061 local_cork = 0; 1062 } 1063 asoc = cmd->obj.ptr; 1064 /* Register with the endpoint. */ 1065 sctp_endpoint_add_asoc(ep, asoc); 1066 sctp_hash_established(asoc); 1067 break; 1068 1069 case SCTP_CMD_UPDATE_ASSOC: 1070 sctp_assoc_update(asoc, cmd->obj.ptr); 1071 break; 1072 1073 case SCTP_CMD_PURGE_OUTQUEUE: 1074 sctp_outq_teardown(&asoc->outqueue); 1075 break; 1076 1077 case SCTP_CMD_DELETE_TCB: 1078 if (local_cork) { 1079 sctp_outq_uncork(&asoc->outqueue); 1080 local_cork = 0; 1081 } 1082 /* Delete the current association. */ 1083 sctp_cmd_delete_tcb(commands, asoc); 1084 asoc = NULL; 1085 break; 1086 1087 case SCTP_CMD_NEW_STATE: 1088 /* Enter a new state. */ 1089 sctp_cmd_new_state(commands, asoc, cmd->obj.state); 1090 break; 1091 1092 case SCTP_CMD_REPORT_TSN: 1093 /* Record the arrival of a TSN. */ 1094 sctp_tsnmap_mark(&asoc->peer.tsn_map, cmd->obj.u32); 1095 break; 1096 1097 case SCTP_CMD_REPORT_FWDTSN: 1098 /* Move the Cumulattive TSN Ack ahead. */ 1099 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); 1100 1101 /* Abort any in progress partial delivery. */ 1102 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); 1103 break; 1104 1105 case SCTP_CMD_PROCESS_FWDTSN: 1106 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr); 1107 break; 1108 1109 case SCTP_CMD_GEN_SACK: 1110 /* Generate a Selective ACK. 1111 * The argument tells us whether to just count 1112 * the packet and MAYBE generate a SACK, or 1113 * force a SACK out. 1114 */ 1115 force = cmd->obj.i32; 1116 error = sctp_gen_sack(asoc, force, commands); 1117 break; 1118 1119 case SCTP_CMD_PROCESS_SACK: 1120 /* Process an inbound SACK. */ 1121 error = sctp_cmd_process_sack(commands, asoc, 1122 cmd->obj.ptr); 1123 break; 1124 1125 case SCTP_CMD_GEN_INIT_ACK: 1126 /* Generate an INIT ACK chunk. */ 1127 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, 1128 0); 1129 if (!new_obj) 1130 goto nomem; 1131 1132 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, 1133 SCTP_CHUNK(new_obj)); 1134 break; 1135 1136 case SCTP_CMD_PEER_INIT: 1137 /* Process a unified INIT from the peer. 1138 * Note: Only used during INIT-ACK processing. If 1139 * there is an error just return to the outter 1140 * layer which will bail. 1141 */ 1142 error = sctp_cmd_process_init(commands, asoc, chunk, 1143 cmd->obj.ptr, gfp); 1144 break; 1145 1146 case SCTP_CMD_GEN_COOKIE_ECHO: 1147 /* Generate a COOKIE ECHO chunk. */ 1148 new_obj = sctp_make_cookie_echo(asoc, chunk); 1149 if (!new_obj) { 1150 if (cmd->obj.ptr) 1151 sctp_chunk_free(cmd->obj.ptr); 1152 goto nomem; 1153 } 1154 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, 1155 SCTP_CHUNK(new_obj)); 1156 1157 /* If there is an ERROR chunk to be sent along with 1158 * the COOKIE_ECHO, send it, too. 1159 */ 1160 if (cmd->obj.ptr) 1161 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, 1162 SCTP_CHUNK(cmd->obj.ptr)); 1163 1164 /* FIXME - Eventually come up with a cleaner way to 1165 * enabling COOKIE-ECHO + DATA bundling during 1166 * multihoming stale cookie scenarios, the following 1167 * command plays with asoc->peer.retran_path to 1168 * avoid the problem of sending the COOKIE-ECHO and 1169 * DATA in different paths, which could result 1170 * in the association being ABORTed if the DATA chunk 1171 * is processed first by the server. Checking the 1172 * init error counter simply causes this command 1173 * to be executed only during failed attempts of 1174 * association establishment. 1175 */ 1176 if ((asoc->peer.retran_path != 1177 asoc->peer.primary_path) && 1178 (asoc->init_err_counter > 0)) { 1179 sctp_add_cmd_sf(commands, 1180 SCTP_CMD_FORCE_PRIM_RETRAN, 1181 SCTP_NULL()); 1182 } 1183 1184 break; 1185 1186 case SCTP_CMD_GEN_SHUTDOWN: 1187 /* Generate SHUTDOWN when in SHUTDOWN_SENT state. 1188 * Reset error counts. 1189 */ 1190 asoc->overall_error_count = 0; 1191 1192 /* Generate a SHUTDOWN chunk. */ 1193 new_obj = sctp_make_shutdown(asoc, chunk); 1194 if (!new_obj) 1195 goto nomem; 1196 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, 1197 SCTP_CHUNK(new_obj)); 1198 break; 1199 1200 case SCTP_CMD_CHUNK_ULP: 1201 /* Send a chunk to the sockets layer. */ 1202 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", 1203 "chunk_up:", cmd->obj.ptr, 1204 "ulpq:", &asoc->ulpq); 1205 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr, 1206 GFP_ATOMIC); 1207 break; 1208 1209 case SCTP_CMD_EVENT_ULP: 1210 /* Send a notification to the sockets layer. */ 1211 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", 1212 "event_up:",cmd->obj.ptr, 1213 "ulpq:",&asoc->ulpq); 1214 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr); 1215 break; 1216 1217 case SCTP_CMD_REPLY: 1218 /* If an caller has not already corked, do cork. */ 1219 if (!asoc->outqueue.cork) { 1220 sctp_outq_cork(&asoc->outqueue); 1221 local_cork = 1; 1222 } 1223 /* Send a chunk to our peer. */ 1224 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr); 1225 break; 1226 1227 case SCTP_CMD_SEND_PKT: 1228 /* Send a full packet to our peer. */ 1229 packet = cmd->obj.ptr; 1230 sctp_packet_transmit(packet); 1231 sctp_ootb_pkt_free(packet); 1232 break; 1233 1234 case SCTP_CMD_RETRAN: 1235 /* Mark a transport for retransmission. */ 1236 sctp_retransmit(&asoc->outqueue, cmd->obj.transport, 1237 SCTP_RTXR_T3_RTX); 1238 break; 1239 1240 case SCTP_CMD_TRANSMIT: 1241 /* Kick start transmission. */ 1242 error = sctp_outq_uncork(&asoc->outqueue); 1243 local_cork = 0; 1244 break; 1245 1246 case SCTP_CMD_ECN_CE: 1247 /* Do delayed CE processing. */ 1248 sctp_do_ecn_ce_work(asoc, cmd->obj.u32); 1249 break; 1250 1251 case SCTP_CMD_ECN_ECNE: 1252 /* Do delayed ECNE processing. */ 1253 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, 1254 chunk); 1255 if (new_obj) 1256 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, 1257 SCTP_CHUNK(new_obj)); 1258 break; 1259 1260 case SCTP_CMD_ECN_CWR: 1261 /* Do delayed CWR processing. */ 1262 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); 1263 break; 1264 1265 case SCTP_CMD_SETUP_T2: 1266 sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr); 1267 break; 1268 1269 case SCTP_CMD_TIMER_START: 1270 timer = &asoc->timers[cmd->obj.to]; 1271 timeout = asoc->timeouts[cmd->obj.to]; 1272 BUG_ON(!timeout); 1273 1274 timer->expires = jiffies + timeout; 1275 sctp_association_hold(asoc); 1276 add_timer(timer); 1277 break; 1278 1279 case SCTP_CMD_TIMER_RESTART: 1280 timer = &asoc->timers[cmd->obj.to]; 1281 timeout = asoc->timeouts[cmd->obj.to]; 1282 if (!mod_timer(timer, jiffies + timeout)) 1283 sctp_association_hold(asoc); 1284 break; 1285 1286 case SCTP_CMD_TIMER_STOP: 1287 timer = &asoc->timers[cmd->obj.to]; 1288 if (timer_pending(timer) && del_timer(timer)) 1289 sctp_association_put(asoc); 1290 break; 1291 1292 case SCTP_CMD_INIT_CHOOSE_TRANSPORT: 1293 chunk = cmd->obj.ptr; 1294 t = sctp_assoc_choose_init_transport(asoc); 1295 asoc->init_last_sent_to = t; 1296 chunk->transport = t; 1297 t->init_sent_count++; 1298 break; 1299 1300 case SCTP_CMD_INIT_RESTART: 1301 /* Do the needed accounting and updates 1302 * associated with restarting an initialization 1303 * timer. Only multiply the timeout by two if 1304 * all transports have been tried at the current 1305 * timeout. 1306 */ 1307 t = asoc->init_last_sent_to; 1308 asoc->init_err_counter++; 1309 1310 if (t->init_sent_count > (asoc->init_cycle + 1)) { 1311 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] *= 2; 1312 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] > 1313 asoc->max_init_timeo) { 1314 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = 1315 asoc->max_init_timeo; 1316 } 1317 asoc->init_cycle++; 1318 SCTP_DEBUG_PRINTK( 1319 "T1 INIT Timeout adjustment" 1320 " init_err_counter: %d" 1321 " cycle: %d" 1322 " timeout: %ld\n", 1323 asoc->init_err_counter, 1324 asoc->init_cycle, 1325 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT]); 1326 } 1327 1328 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, 1329 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); 1330 break; 1331 1332 case SCTP_CMD_COOKIEECHO_RESTART: 1333 /* Do the needed accounting and updates 1334 * associated with restarting an initialization 1335 * timer. Only multiply the timeout by two if 1336 * all transports have been tried at the current 1337 * timeout. 1338 */ 1339 asoc->init_err_counter++; 1340 1341 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] *= 2; 1342 if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] > 1343 asoc->max_init_timeo) { 1344 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = 1345 asoc->max_init_timeo; 1346 } 1347 SCTP_DEBUG_PRINTK( 1348 "T1 COOKIE Timeout adjustment" 1349 " init_err_counter: %d" 1350 " timeout: %ld\n", 1351 asoc->init_err_counter, 1352 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE]); 1353 1354 /* If we've sent any data bundled with 1355 * COOKIE-ECHO we need to resend. 1356 */ 1357 list_for_each(pos, &asoc->peer.transport_addr_list) { 1358 t = list_entry(pos, struct sctp_transport, 1359 transports); 1360 sctp_retransmit_mark(&asoc->outqueue, t, 0); 1361 } 1362 1363 sctp_add_cmd_sf(commands, 1364 SCTP_CMD_TIMER_RESTART, 1365 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); 1366 break; 1367 1368 case SCTP_CMD_INIT_FAILED: 1369 sctp_cmd_init_failed(commands, asoc, cmd->obj.err); 1370 break; 1371 1372 case SCTP_CMD_ASSOC_FAILED: 1373 sctp_cmd_assoc_failed(commands, asoc, event_type, 1374 subtype, chunk, cmd->obj.err); 1375 break; 1376 1377 case SCTP_CMD_INIT_COUNTER_INC: 1378 asoc->init_err_counter++; 1379 break; 1380 1381 case SCTP_CMD_INIT_COUNTER_RESET: 1382 asoc->init_err_counter = 0; 1383 asoc->init_cycle = 0; 1384 break; 1385 1386 case SCTP_CMD_REPORT_DUP: 1387 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, 1388 cmd->obj.u32); 1389 break; 1390 1391 case SCTP_CMD_REPORT_BAD_TAG: 1392 SCTP_DEBUG_PRINTK("vtag mismatch!\n"); 1393 break; 1394 1395 case SCTP_CMD_STRIKE: 1396 /* Mark one strike against a transport. */ 1397 sctp_do_8_2_transport_strike(asoc, cmd->obj.transport); 1398 break; 1399 1400 case SCTP_CMD_TRANSPORT_RESET: 1401 t = cmd->obj.transport; 1402 sctp_cmd_transport_reset(commands, asoc, t); 1403 break; 1404 1405 case SCTP_CMD_TRANSPORT_ON: 1406 t = cmd->obj.transport; 1407 sctp_cmd_transport_on(commands, asoc, t, chunk); 1408 break; 1409 1410 case SCTP_CMD_HB_TIMERS_START: 1411 sctp_cmd_hb_timers_start(commands, asoc); 1412 break; 1413 1414 case SCTP_CMD_HB_TIMER_UPDATE: 1415 t = cmd->obj.transport; 1416 sctp_cmd_hb_timer_update(commands, asoc, t); 1417 break; 1418 1419 case SCTP_CMD_HB_TIMERS_STOP: 1420 sctp_cmd_hb_timers_stop(commands, asoc); 1421 break; 1422 1423 case SCTP_CMD_REPORT_ERROR: 1424 error = cmd->obj.error; 1425 break; 1426 1427 case SCTP_CMD_PROCESS_CTSN: 1428 /* Dummy up a SACK for processing. */ 1429 sackh.cum_tsn_ack = cmd->obj.be32; 1430 sackh.a_rwnd = 0; 1431 sackh.num_gap_ack_blocks = 0; 1432 sackh.num_dup_tsns = 0; 1433 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, 1434 SCTP_SACKH(&sackh)); 1435 break; 1436 1437 case SCTP_CMD_DISCARD_PACKET: 1438 /* We need to discard the whole packet. */ 1439 chunk->pdiscard = 1; 1440 break; 1441 1442 case SCTP_CMD_RTO_PENDING: 1443 t = cmd->obj.transport; 1444 t->rto_pending = 1; 1445 break; 1446 1447 case SCTP_CMD_PART_DELIVER: 1448 sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr, 1449 GFP_ATOMIC); 1450 break; 1451 1452 case SCTP_CMD_RENEGE: 1453 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr, 1454 GFP_ATOMIC); 1455 break; 1456 1457 case SCTP_CMD_SETUP_T4: 1458 sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr); 1459 break; 1460 1461 case SCTP_CMD_PROCESS_OPERR: 1462 sctp_cmd_process_operr(commands, asoc, chunk); 1463 break; 1464 case SCTP_CMD_CLEAR_INIT_TAG: 1465 asoc->peer.i.init_tag = 0; 1466 break; 1467 case SCTP_CMD_DEL_NON_PRIMARY: 1468 sctp_cmd_del_non_primary(asoc); 1469 break; 1470 case SCTP_CMD_T3_RTX_TIMERS_STOP: 1471 sctp_cmd_t3_rtx_timers_stop(commands, asoc); 1472 break; 1473 case SCTP_CMD_FORCE_PRIM_RETRAN: 1474 t = asoc->peer.retran_path; 1475 asoc->peer.retran_path = asoc->peer.primary_path; 1476 error = sctp_outq_uncork(&asoc->outqueue); 1477 local_cork = 0; 1478 asoc->peer.retran_path = t; 1479 break; 1480 case SCTP_CMD_SET_SK_ERR: 1481 sctp_cmd_set_sk_err(asoc, cmd->obj.error); 1482 break; 1483 default: 1484 printk(KERN_WARNING "Impossible command: %u, %p\n", 1485 cmd->verb, cmd->obj.ptr); 1486 break; 1487 }; 1488 if (error) 1489 break; 1490 } 1491 1492 out: 1493 if (local_cork) 1494 sctp_outq_uncork(&asoc->outqueue); 1495 return error; 1496 nomem: 1497 error = -ENOMEM; 1498 goto out; 1499 } 1500 1501