1 /* SCTP kernel 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 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 * This SCTP 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 * This SCTP 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 asoc->peer.sack_cnt++; 194 195 /* Set the SACK delay timeout based on the 196 * SACK delay for the last transport 197 * data was received from, or the default 198 * for the association. 199 */ 200 if (trans) { 201 /* We will need a SACK for the next packet. */ 202 if (asoc->peer.sack_cnt >= trans->sackfreq - 1) 203 asoc->peer.sack_needed = 1; 204 205 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = 206 trans->sackdelay; 207 } else { 208 /* We will need a SACK for the next packet. */ 209 if (asoc->peer.sack_cnt >= asoc->sackfreq - 1) 210 asoc->peer.sack_needed = 1; 211 212 asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = 213 asoc->sackdelay; 214 } 215 216 /* Restart the SACK timer. */ 217 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, 218 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); 219 } else { 220 if (asoc->a_rwnd > asoc->rwnd) 221 asoc->a_rwnd = asoc->rwnd; 222 sack = sctp_make_sack(asoc); 223 if (!sack) 224 goto nomem; 225 226 asoc->peer.sack_needed = 0; 227 asoc->peer.sack_cnt = 0; 228 229 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); 230 231 /* Stop the SACK timer. */ 232 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, 233 SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); 234 } 235 236 return error; 237 nomem: 238 error = -ENOMEM; 239 return error; 240 } 241 242 /* When the T3-RTX timer expires, it calls this function to create the 243 * relevant state machine event. 244 */ 245 void sctp_generate_t3_rtx_event(unsigned long peer) 246 { 247 int error; 248 struct sctp_transport *transport = (struct sctp_transport *) peer; 249 struct sctp_association *asoc = transport->asoc; 250 251 /* Check whether a task is in the sock. */ 252 253 sctp_bh_lock_sock(asoc->base.sk); 254 if (sock_owned_by_user(asoc->base.sk)) { 255 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__); 256 257 /* Try again later. */ 258 if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) 259 sctp_transport_hold(transport); 260 goto out_unlock; 261 } 262 263 /* Is this transport really dead and just waiting around for 264 * the timer to let go of the reference? 265 */ 266 if (transport->dead) 267 goto out_unlock; 268 269 /* Run through the state machine. */ 270 error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, 271 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), 272 asoc->state, 273 asoc->ep, asoc, 274 transport, GFP_ATOMIC); 275 276 if (error) 277 asoc->base.sk->sk_err = -error; 278 279 out_unlock: 280 sctp_bh_unlock_sock(asoc->base.sk); 281 sctp_transport_put(transport); 282 } 283 284 /* This is a sa interface for producing timeout events. It works 285 * for timeouts which use the association as their parameter. 286 */ 287 static void sctp_generate_timeout_event(struct sctp_association *asoc, 288 sctp_event_timeout_t timeout_type) 289 { 290 int error = 0; 291 292 sctp_bh_lock_sock(asoc->base.sk); 293 if (sock_owned_by_user(asoc->base.sk)) { 294 SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n", 295 __func__, 296 timeout_type); 297 298 /* Try again later. */ 299 if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) 300 sctp_association_hold(asoc); 301 goto out_unlock; 302 } 303 304 /* Is this association really dead and just waiting around for 305 * the timer to let go of the reference? 306 */ 307 if (asoc->base.dead) 308 goto out_unlock; 309 310 /* Run through the state machine. */ 311 error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, 312 SCTP_ST_TIMEOUT(timeout_type), 313 asoc->state, asoc->ep, asoc, 314 (void *)timeout_type, GFP_ATOMIC); 315 316 if (error) 317 asoc->base.sk->sk_err = -error; 318 319 out_unlock: 320 sctp_bh_unlock_sock(asoc->base.sk); 321 sctp_association_put(asoc); 322 } 323 324 static void sctp_generate_t1_cookie_event(unsigned long data) 325 { 326 struct sctp_association *asoc = (struct sctp_association *) data; 327 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); 328 } 329 330 static void sctp_generate_t1_init_event(unsigned long data) 331 { 332 struct sctp_association *asoc = (struct sctp_association *) data; 333 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); 334 } 335 336 static void sctp_generate_t2_shutdown_event(unsigned long data) 337 { 338 struct sctp_association *asoc = (struct sctp_association *) data; 339 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); 340 } 341 342 static void sctp_generate_t4_rto_event(unsigned long data) 343 { 344 struct sctp_association *asoc = (struct sctp_association *) data; 345 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); 346 } 347 348 static void sctp_generate_t5_shutdown_guard_event(unsigned long data) 349 { 350 struct sctp_association *asoc = (struct sctp_association *)data; 351 sctp_generate_timeout_event(asoc, 352 SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); 353 354 } /* sctp_generate_t5_shutdown_guard_event() */ 355 356 static void sctp_generate_autoclose_event(unsigned long data) 357 { 358 struct sctp_association *asoc = (struct sctp_association *) data; 359 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); 360 } 361 362 /* Generate a heart beat event. If the sock is busy, reschedule. Make 363 * sure that the transport is still valid. 364 */ 365 void sctp_generate_heartbeat_event(unsigned long data) 366 { 367 int error = 0; 368 struct sctp_transport *transport = (struct sctp_transport *) data; 369 struct sctp_association *asoc = transport->asoc; 370 371 sctp_bh_lock_sock(asoc->base.sk); 372 if (sock_owned_by_user(asoc->base.sk)) { 373 SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__); 374 375 /* Try again later. */ 376 if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) 377 sctp_transport_hold(transport); 378 goto out_unlock; 379 } 380 381 /* Is this structure just waiting around for us to actually 382 * get destroyed? 383 */ 384 if (transport->dead) 385 goto out_unlock; 386 387 error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, 388 SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), 389 asoc->state, asoc->ep, asoc, 390 transport, GFP_ATOMIC); 391 392 if (error) 393 asoc->base.sk->sk_err = -error; 394 395 out_unlock: 396 sctp_bh_unlock_sock(asoc->base.sk); 397 sctp_transport_put(transport); 398 } 399 400 /* Inject a SACK Timeout event into the state machine. */ 401 static void sctp_generate_sack_event(unsigned long data) 402 { 403 struct sctp_association *asoc = (struct sctp_association *) data; 404 sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); 405 } 406 407 sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { 408 NULL, 409 sctp_generate_t1_cookie_event, 410 sctp_generate_t1_init_event, 411 sctp_generate_t2_shutdown_event, 412 NULL, 413 sctp_generate_t4_rto_event, 414 sctp_generate_t5_shutdown_guard_event, 415 NULL, 416 sctp_generate_sack_event, 417 sctp_generate_autoclose_event, 418 }; 419 420 421 /* RFC 2960 8.2 Path Failure Detection 422 * 423 * When its peer endpoint is multi-homed, an endpoint should keep a 424 * error counter for each of the destination transport addresses of the 425 * peer endpoint. 426 * 427 * Each time the T3-rtx timer expires on any address, or when a 428 * HEARTBEAT sent to an idle address is not acknowledged within a RTO, 429 * the error counter of that destination address will be incremented. 430 * When the value in the error counter exceeds the protocol parameter 431 * 'Path.Max.Retrans' of that destination address, the endpoint should 432 * mark the destination transport address as inactive, and a 433 * notification SHOULD be sent to the upper layer. 434 * 435 */ 436 static void sctp_do_8_2_transport_strike(struct sctp_association *asoc, 437 struct sctp_transport *transport, 438 int is_hb) 439 { 440 /* The check for association's overall error counter exceeding the 441 * threshold is done in the state function. 442 */ 443 /* When probing UNCONFIRMED addresses, the association overall 444 * error count is NOT incremented 445 */ 446 if (transport->state != SCTP_UNCONFIRMED) 447 asoc->overall_error_count++; 448 449 if (transport->state != SCTP_INACTIVE && 450 (transport->error_count++ >= transport->pathmaxrxt)) { 451 SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p", 452 " transport IP: port:%d failed.\n", 453 asoc, 454 (&transport->ipaddr), 455 ntohs(transport->ipaddr.v4.sin_port)); 456 sctp_assoc_control_transport(asoc, transport, 457 SCTP_TRANSPORT_DOWN, 458 SCTP_FAILED_THRESHOLD); 459 } 460 461 /* E2) For the destination address for which the timer 462 * expires, set RTO <- RTO * 2 ("back off the timer"). The 463 * maximum value discussed in rule C7 above (RTO.max) may be 464 * used to provide an upper bound to this doubling operation. 465 * 466 * Special Case: the first HB doesn't trigger exponential backoff. 467 * The first unacknowleged HB triggers it. We do this with a flag 468 * that indicates that we have an outstanding HB. 469 */ 470 if (!is_hb || transport->hb_sent) { 471 transport->last_rto = transport->rto; 472 transport->rto = min((transport->rto * 2), transport->asoc->rto_max); 473 } 474 } 475 476 /* Worker routine to handle INIT command failure. */ 477 static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, 478 struct sctp_association *asoc, 479 unsigned error) 480 { 481 struct sctp_ulpevent *event; 482 483 event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC, 484 (__u16)error, 0, 0, NULL, 485 GFP_ATOMIC); 486 487 if (event) 488 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, 489 SCTP_ULPEVENT(event)); 490 491 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, 492 SCTP_STATE(SCTP_STATE_CLOSED)); 493 494 /* SEND_FAILED sent later when cleaning up the association. */ 495 asoc->outqueue.error = error; 496 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); 497 } 498 499 /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ 500 static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, 501 struct sctp_association *asoc, 502 sctp_event_t event_type, 503 sctp_subtype_t subtype, 504 struct sctp_chunk *chunk, 505 unsigned error) 506 { 507 struct sctp_ulpevent *event; 508 509 /* Cancel any partial delivery in progress. */ 510 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); 511 512 if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) 513 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, 514 (__u16)error, 0, 0, chunk, 515 GFP_ATOMIC); 516 else 517 event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, 518 (__u16)error, 0, 0, NULL, 519 GFP_ATOMIC); 520 if (event) 521 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, 522 SCTP_ULPEVENT(event)); 523 524 sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, 525 SCTP_STATE(SCTP_STATE_CLOSED)); 526 527 /* SEND_FAILED sent later when cleaning up the association. */ 528 asoc->outqueue.error = error; 529 sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); 530 } 531 532 /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT 533 * inside the cookie. In reality, this is only used for INIT-ACK processing 534 * since all other cases use "temporary" associations and can do all 535 * their work in statefuns directly. 536 */ 537 static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, 538 struct sctp_association *asoc, 539 struct sctp_chunk *chunk, 540 sctp_init_chunk_t *peer_init, 541 gfp_t gfp) 542 { 543 int error; 544 545 /* We only process the init as a sideeffect in a single 546 * case. This is when we process the INIT-ACK. If we 547 * fail during INIT processing (due to malloc problems), 548 * just return the error and stop processing the stack. 549 */ 550 if (!sctp_process_init(asoc, chunk->chunk_hdr->type, 551 sctp_source(chunk), peer_init, gfp)) 552 error = -ENOMEM; 553 else 554 error = 0; 555 556 return error; 557 } 558 559 /* Helper function to break out starting up of heartbeat timers. */ 560 static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, 561 struct sctp_association *asoc) 562 { 563 struct sctp_transport *t; 564 565 /* Start a heartbeat timer for each transport on the association. 566 * hold a reference on the transport to make sure none of 567 * the needed data structures go away. 568 */ 569 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) { 570 571 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) 572 sctp_transport_hold(t); 573 } 574 } 575 576 static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, 577 struct sctp_association *asoc) 578 { 579 struct sctp_transport *t; 580 581 /* Stop all heartbeat timers. */ 582 583 list_for_each_entry(t, &asoc->peer.transport_addr_list, 584 transports) { 585 if (del_timer(&t->hb_timer)) 586 sctp_transport_put(t); 587 } 588 } 589 590 /* Helper function to stop any pending T3-RTX timers */ 591 static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, 592 struct sctp_association *asoc) 593 { 594 struct sctp_transport *t; 595 596 list_for_each_entry(t, &asoc->peer.transport_addr_list, 597 transports) { 598 if (timer_pending(&t->T3_rtx_timer) && 599 del_timer(&t->T3_rtx_timer)) { 600 sctp_transport_put(t); 601 } 602 } 603 } 604 605 606 /* Helper function to update the heartbeat timer. */ 607 static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, 608 struct sctp_transport *t) 609 { 610 /* Update the heartbeat timer. */ 611 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) 612 sctp_transport_hold(t); 613 } 614 615 /* Helper function to handle the reception of an HEARTBEAT ACK. */ 616 static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, 617 struct sctp_association *asoc, 618 struct sctp_transport *t, 619 struct sctp_chunk *chunk) 620 { 621 sctp_sender_hb_info_t *hbinfo; 622 623 /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the 624 * HEARTBEAT should clear the error counter of the destination 625 * transport address to which the HEARTBEAT was sent. 626 * The association's overall error count is also cleared. 627 */ 628 t->error_count = 0; 629 t->asoc->overall_error_count = 0; 630 631 /* Clear the hb_sent flag to signal that we had a good 632 * acknowledgement. 633 */ 634 t->hb_sent = 0; 635 636 /* Mark the destination transport address as active if it is not so 637 * marked. 638 */ 639 if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) 640 sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, 641 SCTP_HEARTBEAT_SUCCESS); 642 643 /* The receiver of the HEARTBEAT ACK should also perform an 644 * RTT measurement for that destination transport address 645 * using the time value carried in the HEARTBEAT ACK chunk. 646 * If the transport's rto_pending variable has been cleared, 647 * it was most likely due to a retransmit. However, we want 648 * to re-enable it to properly update the rto. 649 */ 650 if (t->rto_pending == 0) 651 t->rto_pending = 1; 652 653 hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; 654 sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); 655 656 /* Update the heartbeat timer. */ 657 if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) 658 sctp_transport_hold(t); 659 } 660 661 662 /* Helper function to process the process SACK command. */ 663 static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, 664 struct sctp_association *asoc, 665 struct sctp_sackhdr *sackh) 666 { 667 int err = 0; 668 669 if (sctp_outq_sack(&asoc->outqueue, sackh)) { 670 /* There are no more TSNs awaiting SACK. */ 671 err = sctp_do_sm(SCTP_EVENT_T_OTHER, 672 SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), 673 asoc->state, asoc->ep, asoc, NULL, 674 GFP_ATOMIC); 675 } 676 677 return err; 678 } 679 680 /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set 681 * the transport for a shutdown chunk. 682 */ 683 static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, 684 struct sctp_association *asoc, 685 struct sctp_chunk *chunk) 686 { 687 struct sctp_transport *t; 688 689 t = sctp_assoc_choose_shutdown_transport(asoc); 690 asoc->shutdown_last_sent_to = t; 691 asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; 692 chunk->transport = t; 693 } 694 695 /* Helper function to change the state of an association. */ 696 static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, 697 struct sctp_association *asoc, 698 sctp_state_t state) 699 { 700 struct sock *sk = asoc->base.sk; 701 702 asoc->state = state; 703 704 SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n", 705 asoc, sctp_state_tbl[state]); 706 707 if (sctp_style(sk, TCP)) { 708 /* Change the sk->sk_state of a TCP-style socket that has 709 * sucessfully completed a connect() call. 710 */ 711 if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) 712 sk->sk_state = SCTP_SS_ESTABLISHED; 713 714 /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ 715 if (sctp_state(asoc, SHUTDOWN_RECEIVED) && 716 sctp_sstate(sk, ESTABLISHED)) 717 sk->sk_shutdown |= RCV_SHUTDOWN; 718 } 719 720 if (sctp_state(asoc, COOKIE_WAIT)) { 721 /* Reset init timeouts since they may have been 722 * increased due to timer expirations. 723 */ 724 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = 725 asoc->rto_initial; 726 asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = 727 asoc->rto_initial; 728 } 729 730 if (sctp_state(asoc, ESTABLISHED) || 731 sctp_state(asoc, CLOSED) || 732 sctp_state(asoc, SHUTDOWN_RECEIVED)) { 733 /* Wake up any processes waiting in the asoc's wait queue in 734 * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). 735 */ 736 if (waitqueue_active(&asoc->wait)) 737 wake_up_interruptible(&asoc->wait); 738 739 /* Wake up any processes waiting in the sk's sleep queue of 740 * a TCP-style or UDP-style peeled-off socket in 741 * sctp_wait_for_accept() or sctp_wait_for_packet(). 742 * For a UDP-style socket, the waiters are woken up by the 743 * notifications. 744 */ 745 if (!sctp_style(sk, UDP)) 746 sk->sk_state_change(sk); 747 } 748 } 749 750 /* Helper function to delete an association. */ 751 static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, 752 struct sctp_association *asoc) 753 { 754 struct sock *sk = asoc->base.sk; 755 756 /* If it is a non-temporary association belonging to a TCP-style 757 * listening socket that is not closed, do not free it so that accept() 758 * can pick it up later. 759 */ 760 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && 761 (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) 762 return; 763 764 sctp_unhash_established(asoc); 765 sctp_association_free(asoc); 766 } 767 768 /* 769 * ADDIP Section 4.1 ASCONF Chunk Procedures 770 * A4) Start a T-4 RTO timer, using the RTO value of the selected 771 * destination address (we use active path instead of primary path just 772 * because primary path may be inactive. 773 */ 774 static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, 775 struct sctp_association *asoc, 776 struct sctp_chunk *chunk) 777 { 778 struct sctp_transport *t; 779 780 t = asoc->peer.active_path; 781 asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; 782 chunk->transport = t; 783 } 784 785 /* Process an incoming Operation Error Chunk. */ 786 static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, 787 struct sctp_association *asoc, 788 struct sctp_chunk *chunk) 789 { 790 struct sctp_errhdr *err_hdr; 791 struct sctp_ulpevent *ev; 792 793 while (chunk->chunk_end > chunk->skb->data) { 794 err_hdr = (struct sctp_errhdr *)(chunk->skb->data); 795 796 ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, 797 GFP_ATOMIC); 798 if (!ev) 799 return; 800 801 sctp_ulpq_tail_event(&asoc->ulpq, ev); 802 803 switch (err_hdr->cause) { 804 case SCTP_ERROR_UNKNOWN_CHUNK: 805 { 806 sctp_chunkhdr_t *unk_chunk_hdr; 807 808 unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable; 809 switch (unk_chunk_hdr->type) { 810 /* ADDIP 4.1 A9) If the peer responds to an ASCONF with 811 * an ERROR chunk reporting that it did not recognized 812 * the ASCONF chunk type, the sender of the ASCONF MUST 813 * NOT send any further ASCONF chunks and MUST stop its 814 * T-4 timer. 815 */ 816 case SCTP_CID_ASCONF: 817 if (asoc->peer.asconf_capable == 0) 818 break; 819 820 asoc->peer.asconf_capable = 0; 821 sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, 822 SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); 823 break; 824 default: 825 break; 826 } 827 break; 828 } 829 default: 830 break; 831 } 832 } 833 } 834 835 /* Process variable FWDTSN chunk information. */ 836 static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, 837 struct sctp_chunk *chunk) 838 { 839 struct sctp_fwdtsn_skip *skip; 840 /* Walk through all the skipped SSNs */ 841 sctp_walk_fwdtsn(skip, chunk) { 842 sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); 843 } 844 845 return; 846 } 847 848 /* Helper function to remove the association non-primary peer 849 * transports. 850 */ 851 static void sctp_cmd_del_non_primary(struct sctp_association *asoc) 852 { 853 struct sctp_transport *t; 854 struct list_head *pos; 855 struct list_head *temp; 856 857 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { 858 t = list_entry(pos, struct sctp_transport, transports); 859 if (!sctp_cmp_addr_exact(&t->ipaddr, 860 &asoc->peer.primary_addr)) { 861 sctp_assoc_del_peer(asoc, &t->ipaddr); 862 } 863 } 864 865 return; 866 } 867 868 /* Helper function to set sk_err on a 1-1 style socket. */ 869 static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) 870 { 871 struct sock *sk = asoc->base.sk; 872 873 if (!sctp_style(sk, UDP)) 874 sk->sk_err = error; 875 } 876 877 /* Helper function to generate an association change event */ 878 static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands, 879 struct sctp_association *asoc, 880 u8 state) 881 { 882 struct sctp_ulpevent *ev; 883 884 ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, 885 asoc->c.sinit_num_ostreams, 886 asoc->c.sinit_max_instreams, 887 NULL, GFP_ATOMIC); 888 if (ev) 889 sctp_ulpq_tail_event(&asoc->ulpq, ev); 890 } 891 892 /* Helper function to generate an adaptation indication event */ 893 static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands, 894 struct sctp_association *asoc) 895 { 896 struct sctp_ulpevent *ev; 897 898 ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); 899 900 if (ev) 901 sctp_ulpq_tail_event(&asoc->ulpq, ev); 902 } 903 904 905 static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, 906 sctp_event_timeout_t timer, 907 char *name) 908 { 909 struct sctp_transport *t; 910 911 t = asoc->init_last_sent_to; 912 asoc->init_err_counter++; 913 914 if (t->init_sent_count > (asoc->init_cycle + 1)) { 915 asoc->timeouts[timer] *= 2; 916 if (asoc->timeouts[timer] > asoc->max_init_timeo) { 917 asoc->timeouts[timer] = asoc->max_init_timeo; 918 } 919 asoc->init_cycle++; 920 SCTP_DEBUG_PRINTK( 921 "T1 %s Timeout adjustment" 922 " init_err_counter: %d" 923 " cycle: %d" 924 " timeout: %ld\n", 925 name, 926 asoc->init_err_counter, 927 asoc->init_cycle, 928 asoc->timeouts[timer]); 929 } 930 931 } 932 933 /* These three macros allow us to pull the debugging code out of the 934 * main flow of sctp_do_sm() to keep attention focused on the real 935 * functionality there. 936 */ 937 #define DEBUG_PRE \ 938 SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \ 939 "ep %p, %s, %s, asoc %p[%s], %s\n", \ 940 ep, sctp_evttype_tbl[event_type], \ 941 (*debug_fn)(subtype), asoc, \ 942 sctp_state_tbl[state], state_fn->name) 943 944 #define DEBUG_POST \ 945 SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \ 946 "asoc %p, status: %s\n", \ 947 asoc, sctp_status_tbl[status]) 948 949 #define DEBUG_POST_SFX \ 950 SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \ 951 error, asoc, \ 952 sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ 953 sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED]) 954 955 /* 956 * This is the master state machine processing function. 957 * 958 * If you want to understand all of lksctp, this is a 959 * good place to start. 960 */ 961 int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype, 962 sctp_state_t state, 963 struct sctp_endpoint *ep, 964 struct sctp_association *asoc, 965 void *event_arg, 966 gfp_t gfp) 967 { 968 sctp_cmd_seq_t commands; 969 const sctp_sm_table_entry_t *state_fn; 970 sctp_disposition_t status; 971 int error = 0; 972 typedef const char *(printfn_t)(sctp_subtype_t); 973 974 static printfn_t *table[] = { 975 NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, 976 }; 977 printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; 978 979 /* Look up the state function, run it, and then process the 980 * side effects. These three steps are the heart of lksctp. 981 */ 982 state_fn = sctp_sm_lookup_event(event_type, state, subtype); 983 984 sctp_init_cmd_seq(&commands); 985 986 DEBUG_PRE; 987 status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands); 988 DEBUG_POST; 989 990 error = sctp_side_effects(event_type, subtype, state, 991 ep, asoc, event_arg, status, 992 &commands, gfp); 993 DEBUG_POST_SFX; 994 995 return error; 996 } 997 998 #undef DEBUG_PRE 999 #undef DEBUG_POST 1000 1001 /***************************************************************** 1002 * This the master state function side effect processing function. 1003 *****************************************************************/ 1004 static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, 1005 sctp_state_t state, 1006 struct sctp_endpoint *ep, 1007 struct sctp_association *asoc, 1008 void *event_arg, 1009 sctp_disposition_t status, 1010 sctp_cmd_seq_t *commands, 1011 gfp_t gfp) 1012 { 1013 int error; 1014 1015 /* FIXME - Most of the dispositions left today would be categorized 1016 * as "exceptional" dispositions. For those dispositions, it 1017 * may not be proper to run through any of the commands at all. 1018 * For example, the command interpreter might be run only with 1019 * disposition SCTP_DISPOSITION_CONSUME. 1020 */ 1021 if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, 1022 ep, asoc, 1023 event_arg, status, 1024 commands, gfp))) 1025 goto bail; 1026 1027 switch (status) { 1028 case SCTP_DISPOSITION_DISCARD: 1029 SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, " 1030 "event_type %d, event_id %d\n", 1031 state, event_type, subtype.chunk); 1032 break; 1033 1034 case SCTP_DISPOSITION_NOMEM: 1035 /* We ran out of memory, so we need to discard this 1036 * packet. 1037 */ 1038 /* BUG--we should now recover some memory, probably by 1039 * reneging... 1040 */ 1041 error = -ENOMEM; 1042 break; 1043 1044 case SCTP_DISPOSITION_DELETE_TCB: 1045 /* This should now be a command. */ 1046 break; 1047 1048 case SCTP_DISPOSITION_CONSUME: 1049 case SCTP_DISPOSITION_ABORT: 1050 /* 1051 * We should no longer have much work to do here as the 1052 * real work has been done as explicit commands above. 1053 */ 1054 break; 1055 1056 case SCTP_DISPOSITION_VIOLATION: 1057 if (net_ratelimit()) 1058 printk(KERN_ERR "sctp protocol violation state %d " 1059 "chunkid %d\n", state, subtype.chunk); 1060 break; 1061 1062 case SCTP_DISPOSITION_NOT_IMPL: 1063 printk(KERN_WARNING "sctp unimplemented feature in state %d, " 1064 "event_type %d, event_id %d\n", 1065 state, event_type, subtype.chunk); 1066 break; 1067 1068 case SCTP_DISPOSITION_BUG: 1069 printk(KERN_ERR "sctp bug in state %d, " 1070 "event_type %d, event_id %d\n", 1071 state, event_type, subtype.chunk); 1072 BUG(); 1073 break; 1074 1075 default: 1076 printk(KERN_ERR "sctp impossible disposition %d " 1077 "in state %d, event_type %d, event_id %d\n", 1078 status, state, event_type, subtype.chunk); 1079 BUG(); 1080 break; 1081 } 1082 1083 bail: 1084 return error; 1085 } 1086 1087 /******************************************************************** 1088 * 2nd Level Abstractions 1089 ********************************************************************/ 1090 1091 /* This is the side-effect interpreter. */ 1092 static int sctp_cmd_interpreter(sctp_event_t event_type, 1093 sctp_subtype_t subtype, 1094 sctp_state_t state, 1095 struct sctp_endpoint *ep, 1096 struct sctp_association *asoc, 1097 void *event_arg, 1098 sctp_disposition_t status, 1099 sctp_cmd_seq_t *commands, 1100 gfp_t gfp) 1101 { 1102 int error = 0; 1103 int force; 1104 sctp_cmd_t *cmd; 1105 struct sctp_chunk *new_obj; 1106 struct sctp_chunk *chunk = NULL; 1107 struct sctp_packet *packet; 1108 struct timer_list *timer; 1109 unsigned long timeout; 1110 struct sctp_transport *t; 1111 struct sctp_sackhdr sackh; 1112 int local_cork = 0; 1113 1114 if (SCTP_EVENT_T_TIMEOUT != event_type) 1115 chunk = (struct sctp_chunk *) event_arg; 1116 1117 /* Note: This whole file is a huge candidate for rework. 1118 * For example, each command could either have its own handler, so 1119 * the loop would look like: 1120 * while (cmds) 1121 * cmd->handle(x, y, z) 1122 * --jgrimm 1123 */ 1124 while (NULL != (cmd = sctp_next_cmd(commands))) { 1125 switch (cmd->verb) { 1126 case SCTP_CMD_NOP: 1127 /* Do nothing. */ 1128 break; 1129 1130 case SCTP_CMD_NEW_ASOC: 1131 /* Register a new association. */ 1132 if (local_cork) { 1133 sctp_outq_uncork(&asoc->outqueue); 1134 local_cork = 0; 1135 } 1136 asoc = cmd->obj.ptr; 1137 /* Register with the endpoint. */ 1138 sctp_endpoint_add_asoc(ep, asoc); 1139 sctp_hash_established(asoc); 1140 break; 1141 1142 case SCTP_CMD_UPDATE_ASSOC: 1143 sctp_assoc_update(asoc, cmd->obj.ptr); 1144 break; 1145 1146 case SCTP_CMD_PURGE_OUTQUEUE: 1147 sctp_outq_teardown(&asoc->outqueue); 1148 break; 1149 1150 case SCTP_CMD_DELETE_TCB: 1151 if (local_cork) { 1152 sctp_outq_uncork(&asoc->outqueue); 1153 local_cork = 0; 1154 } 1155 /* Delete the current association. */ 1156 sctp_cmd_delete_tcb(commands, asoc); 1157 asoc = NULL; 1158 break; 1159 1160 case SCTP_CMD_NEW_STATE: 1161 /* Enter a new state. */ 1162 sctp_cmd_new_state(commands, asoc, cmd->obj.state); 1163 break; 1164 1165 case SCTP_CMD_REPORT_TSN: 1166 /* Record the arrival of a TSN. */ 1167 error = sctp_tsnmap_mark(&asoc->peer.tsn_map, 1168 cmd->obj.u32); 1169 break; 1170 1171 case SCTP_CMD_REPORT_FWDTSN: 1172 /* Move the Cumulattive TSN Ack ahead. */ 1173 sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); 1174 1175 /* purge the fragmentation queue */ 1176 sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32); 1177 1178 /* Abort any in progress partial delivery. */ 1179 sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); 1180 break; 1181 1182 case SCTP_CMD_PROCESS_FWDTSN: 1183 sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr); 1184 break; 1185 1186 case SCTP_CMD_GEN_SACK: 1187 /* Generate a Selective ACK. 1188 * The argument tells us whether to just count 1189 * the packet and MAYBE generate a SACK, or 1190 * force a SACK out. 1191 */ 1192 force = cmd->obj.i32; 1193 error = sctp_gen_sack(asoc, force, commands); 1194 break; 1195 1196 case SCTP_CMD_PROCESS_SACK: 1197 /* Process an inbound SACK. */ 1198 error = sctp_cmd_process_sack(commands, asoc, 1199 cmd->obj.ptr); 1200 break; 1201 1202 case SCTP_CMD_GEN_INIT_ACK: 1203 /* Generate an INIT ACK chunk. */ 1204 new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, 1205 0); 1206 if (!new_obj) 1207 goto nomem; 1208 1209 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, 1210 SCTP_CHUNK(new_obj)); 1211 break; 1212 1213 case SCTP_CMD_PEER_INIT: 1214 /* Process a unified INIT from the peer. 1215 * Note: Only used during INIT-ACK processing. If 1216 * there is an error just return to the outter 1217 * layer which will bail. 1218 */ 1219 error = sctp_cmd_process_init(commands, asoc, chunk, 1220 cmd->obj.ptr, gfp); 1221 break; 1222 1223 case SCTP_CMD_GEN_COOKIE_ECHO: 1224 /* Generate a COOKIE ECHO chunk. */ 1225 new_obj = sctp_make_cookie_echo(asoc, chunk); 1226 if (!new_obj) { 1227 if (cmd->obj.ptr) 1228 sctp_chunk_free(cmd->obj.ptr); 1229 goto nomem; 1230 } 1231 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, 1232 SCTP_CHUNK(new_obj)); 1233 1234 /* If there is an ERROR chunk to be sent along with 1235 * the COOKIE_ECHO, send it, too. 1236 */ 1237 if (cmd->obj.ptr) 1238 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, 1239 SCTP_CHUNK(cmd->obj.ptr)); 1240 1241 if (new_obj->transport) { 1242 new_obj->transport->init_sent_count++; 1243 asoc->init_last_sent_to = new_obj->transport; 1244 } 1245 1246 /* FIXME - Eventually come up with a cleaner way to 1247 * enabling COOKIE-ECHO + DATA bundling during 1248 * multihoming stale cookie scenarios, the following 1249 * command plays with asoc->peer.retran_path to 1250 * avoid the problem of sending the COOKIE-ECHO and 1251 * DATA in different paths, which could result 1252 * in the association being ABORTed if the DATA chunk 1253 * is processed first by the server. Checking the 1254 * init error counter simply causes this command 1255 * to be executed only during failed attempts of 1256 * association establishment. 1257 */ 1258 if ((asoc->peer.retran_path != 1259 asoc->peer.primary_path) && 1260 (asoc->init_err_counter > 0)) { 1261 sctp_add_cmd_sf(commands, 1262 SCTP_CMD_FORCE_PRIM_RETRAN, 1263 SCTP_NULL()); 1264 } 1265 1266 break; 1267 1268 case SCTP_CMD_GEN_SHUTDOWN: 1269 /* Generate SHUTDOWN when in SHUTDOWN_SENT state. 1270 * Reset error counts. 1271 */ 1272 asoc->overall_error_count = 0; 1273 1274 /* Generate a SHUTDOWN chunk. */ 1275 new_obj = sctp_make_shutdown(asoc, chunk); 1276 if (!new_obj) 1277 goto nomem; 1278 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, 1279 SCTP_CHUNK(new_obj)); 1280 break; 1281 1282 case SCTP_CMD_CHUNK_ULP: 1283 /* Send a chunk to the sockets layer. */ 1284 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", 1285 "chunk_up:", cmd->obj.ptr, 1286 "ulpq:", &asoc->ulpq); 1287 sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr, 1288 GFP_ATOMIC); 1289 break; 1290 1291 case SCTP_CMD_EVENT_ULP: 1292 /* Send a notification to the sockets layer. */ 1293 SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", 1294 "event_up:",cmd->obj.ptr, 1295 "ulpq:",&asoc->ulpq); 1296 sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr); 1297 break; 1298 1299 case SCTP_CMD_REPLY: 1300 /* If an caller has not already corked, do cork. */ 1301 if (!asoc->outqueue.cork) { 1302 sctp_outq_cork(&asoc->outqueue); 1303 local_cork = 1; 1304 } 1305 /* Send a chunk to our peer. */ 1306 error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr); 1307 break; 1308 1309 case SCTP_CMD_SEND_PKT: 1310 /* Send a full packet to our peer. */ 1311 packet = cmd->obj.ptr; 1312 sctp_packet_transmit(packet); 1313 sctp_ootb_pkt_free(packet); 1314 break; 1315 1316 case SCTP_CMD_T1_RETRAN: 1317 /* Mark a transport for retransmission. */ 1318 sctp_retransmit(&asoc->outqueue, cmd->obj.transport, 1319 SCTP_RTXR_T1_RTX); 1320 break; 1321 1322 case SCTP_CMD_RETRAN: 1323 /* Mark a transport for retransmission. */ 1324 sctp_retransmit(&asoc->outqueue, cmd->obj.transport, 1325 SCTP_RTXR_T3_RTX); 1326 break; 1327 1328 case SCTP_CMD_TRANSMIT: 1329 /* Kick start transmission. */ 1330 error = sctp_outq_uncork(&asoc->outqueue); 1331 local_cork = 0; 1332 break; 1333 1334 case SCTP_CMD_ECN_CE: 1335 /* Do delayed CE processing. */ 1336 sctp_do_ecn_ce_work(asoc, cmd->obj.u32); 1337 break; 1338 1339 case SCTP_CMD_ECN_ECNE: 1340 /* Do delayed ECNE processing. */ 1341 new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, 1342 chunk); 1343 if (new_obj) 1344 sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, 1345 SCTP_CHUNK(new_obj)); 1346 break; 1347 1348 case SCTP_CMD_ECN_CWR: 1349 /* Do delayed CWR processing. */ 1350 sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); 1351 break; 1352 1353 case SCTP_CMD_SETUP_T2: 1354 sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr); 1355 break; 1356 1357 case SCTP_CMD_TIMER_START: 1358 timer = &asoc->timers[cmd->obj.to]; 1359 timeout = asoc->timeouts[cmd->obj.to]; 1360 BUG_ON(!timeout); 1361 1362 timer->expires = jiffies + timeout; 1363 sctp_association_hold(asoc); 1364 add_timer(timer); 1365 break; 1366 1367 case SCTP_CMD_TIMER_RESTART: 1368 timer = &asoc->timers[cmd->obj.to]; 1369 timeout = asoc->timeouts[cmd->obj.to]; 1370 if (!mod_timer(timer, jiffies + timeout)) 1371 sctp_association_hold(asoc); 1372 break; 1373 1374 case SCTP_CMD_TIMER_STOP: 1375 timer = &asoc->timers[cmd->obj.to]; 1376 if (timer_pending(timer) && del_timer(timer)) 1377 sctp_association_put(asoc); 1378 break; 1379 1380 case SCTP_CMD_INIT_CHOOSE_TRANSPORT: 1381 chunk = cmd->obj.ptr; 1382 t = sctp_assoc_choose_init_transport(asoc); 1383 asoc->init_last_sent_to = t; 1384 chunk->transport = t; 1385 t->init_sent_count++; 1386 break; 1387 1388 case SCTP_CMD_INIT_RESTART: 1389 /* Do the needed accounting and updates 1390 * associated with restarting an initialization 1391 * timer. Only multiply the timeout by two if 1392 * all transports have been tried at the current 1393 * timeout. 1394 */ 1395 sctp_cmd_t1_timer_update(asoc, 1396 SCTP_EVENT_TIMEOUT_T1_INIT, 1397 "INIT"); 1398 1399 sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, 1400 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); 1401 break; 1402 1403 case SCTP_CMD_COOKIEECHO_RESTART: 1404 /* Do the needed accounting and updates 1405 * associated with restarting an initialization 1406 * timer. Only multiply the timeout by two if 1407 * all transports have been tried at the current 1408 * timeout. 1409 */ 1410 sctp_cmd_t1_timer_update(asoc, 1411 SCTP_EVENT_TIMEOUT_T1_COOKIE, 1412 "COOKIE"); 1413 1414 /* If we've sent any data bundled with 1415 * COOKIE-ECHO we need to resend. 1416 */ 1417 list_for_each_entry(t, &asoc->peer.transport_addr_list, 1418 transports) { 1419 sctp_retransmit_mark(&asoc->outqueue, t, 1420 SCTP_RTXR_T1_RTX); 1421 } 1422 1423 sctp_add_cmd_sf(commands, 1424 SCTP_CMD_TIMER_RESTART, 1425 SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); 1426 break; 1427 1428 case SCTP_CMD_INIT_FAILED: 1429 sctp_cmd_init_failed(commands, asoc, cmd->obj.err); 1430 break; 1431 1432 case SCTP_CMD_ASSOC_FAILED: 1433 sctp_cmd_assoc_failed(commands, asoc, event_type, 1434 subtype, chunk, cmd->obj.err); 1435 break; 1436 1437 case SCTP_CMD_INIT_COUNTER_INC: 1438 asoc->init_err_counter++; 1439 break; 1440 1441 case SCTP_CMD_INIT_COUNTER_RESET: 1442 asoc->init_err_counter = 0; 1443 asoc->init_cycle = 0; 1444 list_for_each_entry(t, &asoc->peer.transport_addr_list, 1445 transports) { 1446 t->init_sent_count = 0; 1447 } 1448 break; 1449 1450 case SCTP_CMD_REPORT_DUP: 1451 sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, 1452 cmd->obj.u32); 1453 break; 1454 1455 case SCTP_CMD_REPORT_BAD_TAG: 1456 SCTP_DEBUG_PRINTK("vtag mismatch!\n"); 1457 break; 1458 1459 case SCTP_CMD_STRIKE: 1460 /* Mark one strike against a transport. */ 1461 sctp_do_8_2_transport_strike(asoc, cmd->obj.transport, 1462 0); 1463 break; 1464 1465 case SCTP_CMD_TRANSPORT_IDLE: 1466 t = cmd->obj.transport; 1467 sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); 1468 break; 1469 1470 case SCTP_CMD_TRANSPORT_HB_SENT: 1471 t = cmd->obj.transport; 1472 sctp_do_8_2_transport_strike(asoc, t, 1); 1473 t->hb_sent = 1; 1474 break; 1475 1476 case SCTP_CMD_TRANSPORT_ON: 1477 t = cmd->obj.transport; 1478 sctp_cmd_transport_on(commands, asoc, t, chunk); 1479 break; 1480 1481 case SCTP_CMD_HB_TIMERS_START: 1482 sctp_cmd_hb_timers_start(commands, asoc); 1483 break; 1484 1485 case SCTP_CMD_HB_TIMER_UPDATE: 1486 t = cmd->obj.transport; 1487 sctp_cmd_hb_timer_update(commands, t); 1488 break; 1489 1490 case SCTP_CMD_HB_TIMERS_STOP: 1491 sctp_cmd_hb_timers_stop(commands, asoc); 1492 break; 1493 1494 case SCTP_CMD_REPORT_ERROR: 1495 error = cmd->obj.error; 1496 break; 1497 1498 case SCTP_CMD_PROCESS_CTSN: 1499 /* Dummy up a SACK for processing. */ 1500 sackh.cum_tsn_ack = cmd->obj.be32; 1501 sackh.a_rwnd = 0; 1502 sackh.num_gap_ack_blocks = 0; 1503 sackh.num_dup_tsns = 0; 1504 sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, 1505 SCTP_SACKH(&sackh)); 1506 break; 1507 1508 case SCTP_CMD_DISCARD_PACKET: 1509 /* We need to discard the whole packet. 1510 * Uncork the queue since there might be 1511 * responses pending 1512 */ 1513 chunk->pdiscard = 1; 1514 if (asoc) { 1515 sctp_outq_uncork(&asoc->outqueue); 1516 local_cork = 0; 1517 } 1518 break; 1519 1520 case SCTP_CMD_RTO_PENDING: 1521 t = cmd->obj.transport; 1522 t->rto_pending = 1; 1523 break; 1524 1525 case SCTP_CMD_PART_DELIVER: 1526 sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr, 1527 GFP_ATOMIC); 1528 break; 1529 1530 case SCTP_CMD_RENEGE: 1531 sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr, 1532 GFP_ATOMIC); 1533 break; 1534 1535 case SCTP_CMD_SETUP_T4: 1536 sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr); 1537 break; 1538 1539 case SCTP_CMD_PROCESS_OPERR: 1540 sctp_cmd_process_operr(commands, asoc, chunk); 1541 break; 1542 case SCTP_CMD_CLEAR_INIT_TAG: 1543 asoc->peer.i.init_tag = 0; 1544 break; 1545 case SCTP_CMD_DEL_NON_PRIMARY: 1546 sctp_cmd_del_non_primary(asoc); 1547 break; 1548 case SCTP_CMD_T3_RTX_TIMERS_STOP: 1549 sctp_cmd_t3_rtx_timers_stop(commands, asoc); 1550 break; 1551 case SCTP_CMD_FORCE_PRIM_RETRAN: 1552 t = asoc->peer.retran_path; 1553 asoc->peer.retran_path = asoc->peer.primary_path; 1554 error = sctp_outq_uncork(&asoc->outqueue); 1555 local_cork = 0; 1556 asoc->peer.retran_path = t; 1557 break; 1558 case SCTP_CMD_SET_SK_ERR: 1559 sctp_cmd_set_sk_err(asoc, cmd->obj.error); 1560 break; 1561 case SCTP_CMD_ASSOC_CHANGE: 1562 sctp_cmd_assoc_change(commands, asoc, 1563 cmd->obj.u8); 1564 break; 1565 case SCTP_CMD_ADAPTATION_IND: 1566 sctp_cmd_adaptation_ind(commands, asoc); 1567 break; 1568 1569 case SCTP_CMD_ASSOC_SHKEY: 1570 error = sctp_auth_asoc_init_active_key(asoc, 1571 GFP_ATOMIC); 1572 break; 1573 case SCTP_CMD_UPDATE_INITTAG: 1574 asoc->peer.i.init_tag = cmd->obj.u32; 1575 break; 1576 1577 default: 1578 printk(KERN_WARNING "Impossible command: %u, %p\n", 1579 cmd->verb, cmd->obj.ptr); 1580 break; 1581 } 1582 1583 if (error) 1584 break; 1585 } 1586 1587 out: 1588 /* If this is in response to a received chunk, wait until 1589 * we are done with the packet to open the queue so that we don't 1590 * send multiple packets in response to a single request. 1591 */ 1592 if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { 1593 if (chunk->end_of_packet || chunk->singleton) 1594 sctp_outq_uncork(&asoc->outqueue); 1595 } else if (local_cork) 1596 sctp_outq_uncork(&asoc->outqueue); 1597 return error; 1598 nomem: 1599 error = -ENOMEM; 1600 goto out; 1601 } 1602 1603