Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 1 | /* SCTP kernel implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * (C) Copyright IBM Corp. 2001, 2004 |
| 3 | * Copyright (c) 1999 Cisco, Inc. |
| 4 | * Copyright (c) 1999-2001 Motorola, Inc. |
| 5 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 6 | * This file is part of the SCTP kernel implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 12 | * This SCTP implementation is free software; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 18 | * This SCTP implementation is distributed in the hope that it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Joe Perches | 145ce50 | 2010-08-24 13:21:08 +0000 | [diff] [blame] | 50 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #include <linux/skbuff.h> |
| 53 | #include <linux/types.h> |
| 54 | #include <linux/socket.h> |
| 55 | #include <linux/ip.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 56 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #include <net/sock.h> |
| 58 | #include <net/sctp/sctp.h> |
| 59 | #include <net/sctp/sm.h> |
| 60 | |
| 61 | static int sctp_cmd_interpreter(sctp_event_t event_type, |
| 62 | sctp_subtype_t subtype, |
| 63 | sctp_state_t state, |
| 64 | struct sctp_endpoint *ep, |
| 65 | struct sctp_association *asoc, |
| 66 | void *event_arg, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 67 | sctp_disposition_t status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | sctp_cmd_seq_t *commands, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 69 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, |
| 71 | sctp_state_t state, |
| 72 | struct sctp_endpoint *ep, |
| 73 | struct sctp_association *asoc, |
| 74 | void *event_arg, |
| 75 | sctp_disposition_t status, |
| 76 | sctp_cmd_seq_t *commands, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 77 | gfp_t gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | /******************************************************************** |
| 80 | * Helper functions |
| 81 | ********************************************************************/ |
| 82 | |
| 83 | /* A helper function for delayed processing of INET ECN CE bit. */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 84 | static void sctp_do_ecn_ce_work(struct sctp_association *asoc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | __u32 lowest_tsn) |
| 86 | { |
| 87 | /* Save the TSN away for comparison when we receive CWR */ |
| 88 | |
| 89 | asoc->last_ecne_tsn = lowest_tsn; |
| 90 | asoc->need_ecne = 1; |
| 91 | } |
| 92 | |
| 93 | /* Helper function for delayed processing of SCTP ECNE chunk. */ |
| 94 | /* RFC 2960 Appendix A |
| 95 | * |
| 96 | * RFC 2481 details a specific bit for a sender to send in |
| 97 | * the header of its next outbound TCP segment to indicate to |
| 98 | * its peer that it has reduced its congestion window. This |
| 99 | * is termed the CWR bit. For SCTP the same indication is made |
| 100 | * by including the CWR chunk. This chunk contains one data |
| 101 | * element, i.e. the TSN number that was sent in the ECNE chunk. |
| 102 | * This element represents the lowest TSN number in the datagram |
| 103 | * that was originally marked with the CE bit. |
| 104 | */ |
| 105 | static struct sctp_chunk *sctp_do_ecn_ecne_work(struct sctp_association *asoc, |
| 106 | __u32 lowest_tsn, |
| 107 | struct sctp_chunk *chunk) |
| 108 | { |
| 109 | struct sctp_chunk *repl; |
| 110 | |
| 111 | /* Our previously transmitted packet ran into some congestion |
| 112 | * so we should take action by reducing cwnd and ssthresh |
| 113 | * and then ACK our peer that we we've done so by |
| 114 | * sending a CWR. |
| 115 | */ |
| 116 | |
| 117 | /* First, try to determine if we want to actually lower |
| 118 | * our cwnd variables. Only lower them if the ECNE looks more |
| 119 | * recent than the last response. |
| 120 | */ |
| 121 | if (TSN_lt(asoc->last_cwr_tsn, lowest_tsn)) { |
| 122 | struct sctp_transport *transport; |
| 123 | |
| 124 | /* Find which transport's congestion variables |
| 125 | * need to be adjusted. |
| 126 | */ |
| 127 | transport = sctp_assoc_lookup_tsn(asoc, lowest_tsn); |
| 128 | |
| 129 | /* Update the congestion variables. */ |
| 130 | if (transport) |
| 131 | sctp_transport_lower_cwnd(transport, |
| 132 | SCTP_LOWER_CWND_ECNE); |
| 133 | asoc->last_cwr_tsn = lowest_tsn; |
| 134 | } |
| 135 | |
| 136 | /* Always try to quiet the other end. In case of lost CWR, |
| 137 | * resend last_cwr_tsn. |
| 138 | */ |
| 139 | repl = sctp_make_cwr(asoc, asoc->last_cwr_tsn, chunk); |
| 140 | |
| 141 | /* If we run out of memory, it will look like a lost CWR. We'll |
| 142 | * get back in sync eventually. |
| 143 | */ |
| 144 | return repl; |
| 145 | } |
| 146 | |
| 147 | /* Helper function to do delayed processing of ECN CWR chunk. */ |
| 148 | static void sctp_do_ecn_cwr_work(struct sctp_association *asoc, |
| 149 | __u32 lowest_tsn) |
| 150 | { |
| 151 | /* Turn off ECNE getting auto-prepended to every outgoing |
| 152 | * packet |
| 153 | */ |
| 154 | asoc->need_ecne = 0; |
| 155 | } |
| 156 | |
| 157 | /* Generate SACK if necessary. We call this at the end of a packet. */ |
| 158 | static int sctp_gen_sack(struct sctp_association *asoc, int force, |
| 159 | sctp_cmd_seq_t *commands) |
| 160 | { |
| 161 | __u32 ctsn, max_tsn_seen; |
| 162 | struct sctp_chunk *sack; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 163 | struct sctp_transport *trans = asoc->peer.last_data_from; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | int error = 0; |
| 165 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 166 | if (force || |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 167 | (!trans && (asoc->param_flags & SPP_SACKDELAY_DISABLE)) || |
| 168 | (trans && (trans->param_flags & SPP_SACKDELAY_DISABLE))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | asoc->peer.sack_needed = 1; |
| 170 | |
| 171 | ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map); |
| 172 | max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); |
| 173 | |
| 174 | /* From 12.2 Parameters necessary per association (i.e. the TCB): |
| 175 | * |
| 176 | * Ack State : This flag indicates if the next received packet |
| 177 | * : is to be responded to with a SACK. ... |
| 178 | * : When DATA chunks are out of order, SACK's |
| 179 | * : are not delayed (see Section 6). |
| 180 | * |
| 181 | * [This is actually not mentioned in Section 6, but we |
| 182 | * implement it here anyway. --piggy] |
| 183 | */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 184 | if (max_tsn_seen != ctsn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | asoc->peer.sack_needed = 1; |
| 186 | |
| 187 | /* From 6.2 Acknowledgement on Reception of DATA Chunks: |
| 188 | * |
| 189 | * Section 4.2 of [RFC2581] SHOULD be followed. Specifically, |
| 190 | * an acknowledgement SHOULD be generated for at least every |
| 191 | * second packet (not every second DATA chunk) received, and |
| 192 | * SHOULD be generated within 200 ms of the arrival of any |
| 193 | * unacknowledged DATA chunk. ... |
| 194 | */ |
| 195 | if (!asoc->peer.sack_needed) { |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 196 | asoc->peer.sack_cnt++; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 197 | |
| 198 | /* Set the SACK delay timeout based on the |
| 199 | * SACK delay for the last transport |
| 200 | * data was received from, or the default |
| 201 | * for the association. |
| 202 | */ |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 203 | if (trans) { |
| 204 | /* We will need a SACK for the next packet. */ |
| 205 | if (asoc->peer.sack_cnt >= trans->sackfreq - 1) |
| 206 | asoc->peer.sack_needed = 1; |
| 207 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 208 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 209 | trans->sackdelay; |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 210 | } else { |
| 211 | /* We will need a SACK for the next packet. */ |
| 212 | if (asoc->peer.sack_cnt >= asoc->sackfreq - 1) |
| 213 | asoc->peer.sack_needed = 1; |
| 214 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 215 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 216 | asoc->sackdelay; |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 217 | } |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 218 | |
| 219 | /* Restart the SACK timer. */ |
| 220 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
| 221 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | } else { |
Vlad Yasevich | 90f2f53 | 2009-11-23 15:53:57 -0500 | [diff] [blame] | 223 | asoc->a_rwnd = asoc->rwnd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | sack = sctp_make_sack(asoc); |
| 225 | if (!sack) |
| 226 | goto nomem; |
| 227 | |
| 228 | asoc->peer.sack_needed = 0; |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 229 | asoc->peer.sack_cnt = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Vlad Yasevich | 732ba35 | 2007-01-15 19:20:21 -0800 | [diff] [blame] | 231 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(sack)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
| 233 | /* Stop the SACK timer. */ |
| 234 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP, |
| 235 | SCTP_TO(SCTP_EVENT_TIMEOUT_SACK)); |
| 236 | } |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | return error; |
| 239 | nomem: |
| 240 | error = -ENOMEM; |
| 241 | return error; |
| 242 | } |
| 243 | |
| 244 | /* When the T3-RTX timer expires, it calls this function to create the |
| 245 | * relevant state machine event. |
| 246 | */ |
| 247 | void sctp_generate_t3_rtx_event(unsigned long peer) |
| 248 | { |
| 249 | int error; |
| 250 | struct sctp_transport *transport = (struct sctp_transport *) peer; |
| 251 | struct sctp_association *asoc = transport->asoc; |
| 252 | |
| 253 | /* Check whether a task is in the sock. */ |
| 254 | |
| 255 | sctp_bh_lock_sock(asoc->base.sk); |
| 256 | if (sock_owned_by_user(asoc->base.sk)) { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 257 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
| 259 | /* Try again later. */ |
| 260 | if (!mod_timer(&transport->T3_rtx_timer, jiffies + (HZ/20))) |
| 261 | sctp_transport_hold(transport); |
| 262 | goto out_unlock; |
| 263 | } |
| 264 | |
| 265 | /* Is this transport really dead and just waiting around for |
| 266 | * the timer to let go of the reference? |
| 267 | */ |
| 268 | if (transport->dead) |
| 269 | goto out_unlock; |
| 270 | |
| 271 | /* Run through the state machine. */ |
| 272 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, |
| 273 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_T3_RTX), |
| 274 | asoc->state, |
| 275 | asoc->ep, asoc, |
| 276 | transport, GFP_ATOMIC); |
| 277 | |
| 278 | if (error) |
| 279 | asoc->base.sk->sk_err = -error; |
| 280 | |
| 281 | out_unlock: |
| 282 | sctp_bh_unlock_sock(asoc->base.sk); |
| 283 | sctp_transport_put(transport); |
| 284 | } |
| 285 | |
| 286 | /* This is a sa interface for producing timeout events. It works |
| 287 | * for timeouts which use the association as their parameter. |
| 288 | */ |
| 289 | static void sctp_generate_timeout_event(struct sctp_association *asoc, |
| 290 | sctp_event_timeout_t timeout_type) |
| 291 | { |
| 292 | int error = 0; |
| 293 | |
| 294 | sctp_bh_lock_sock(asoc->base.sk); |
| 295 | if (sock_owned_by_user(asoc->base.sk)) { |
| 296 | SCTP_DEBUG_PRINTK("%s:Sock is busy: timer %d\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 297 | __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | timeout_type); |
| 299 | |
| 300 | /* Try again later. */ |
| 301 | if (!mod_timer(&asoc->timers[timeout_type], jiffies + (HZ/20))) |
| 302 | sctp_association_hold(asoc); |
| 303 | goto out_unlock; |
| 304 | } |
| 305 | |
| 306 | /* Is this association really dead and just waiting around for |
| 307 | * the timer to let go of the reference? |
| 308 | */ |
| 309 | if (asoc->base.dead) |
| 310 | goto out_unlock; |
| 311 | |
| 312 | /* Run through the state machine. */ |
| 313 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, |
| 314 | SCTP_ST_TIMEOUT(timeout_type), |
| 315 | asoc->state, asoc->ep, asoc, |
| 316 | (void *)timeout_type, GFP_ATOMIC); |
| 317 | |
| 318 | if (error) |
| 319 | asoc->base.sk->sk_err = -error; |
| 320 | |
| 321 | out_unlock: |
| 322 | sctp_bh_unlock_sock(asoc->base.sk); |
| 323 | sctp_association_put(asoc); |
| 324 | } |
| 325 | |
| 326 | static void sctp_generate_t1_cookie_event(unsigned long data) |
| 327 | { |
| 328 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 329 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_COOKIE); |
| 330 | } |
| 331 | |
| 332 | static void sctp_generate_t1_init_event(unsigned long data) |
| 333 | { |
| 334 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 335 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T1_INIT); |
| 336 | } |
| 337 | |
| 338 | static void sctp_generate_t2_shutdown_event(unsigned long data) |
| 339 | { |
| 340 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 341 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T2_SHUTDOWN); |
| 342 | } |
| 343 | |
| 344 | static void sctp_generate_t4_rto_event(unsigned long data) |
| 345 | { |
| 346 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 347 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_T4_RTO); |
| 348 | } |
| 349 | |
| 350 | static void sctp_generate_t5_shutdown_guard_event(unsigned long data) |
| 351 | { |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 352 | struct sctp_association *asoc = (struct sctp_association *)data; |
| 353 | sctp_generate_timeout_event(asoc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD); |
| 355 | |
| 356 | } /* sctp_generate_t5_shutdown_guard_event() */ |
| 357 | |
| 358 | static void sctp_generate_autoclose_event(unsigned long data) |
| 359 | { |
| 360 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 361 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_AUTOCLOSE); |
| 362 | } |
| 363 | |
| 364 | /* Generate a heart beat event. If the sock is busy, reschedule. Make |
| 365 | * sure that the transport is still valid. |
| 366 | */ |
| 367 | void sctp_generate_heartbeat_event(unsigned long data) |
| 368 | { |
| 369 | int error = 0; |
| 370 | struct sctp_transport *transport = (struct sctp_transport *) data; |
| 371 | struct sctp_association *asoc = transport->asoc; |
| 372 | |
| 373 | sctp_bh_lock_sock(asoc->base.sk); |
| 374 | if (sock_owned_by_user(asoc->base.sk)) { |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 375 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
| 377 | /* Try again later. */ |
| 378 | if (!mod_timer(&transport->hb_timer, jiffies + (HZ/20))) |
| 379 | sctp_transport_hold(transport); |
| 380 | goto out_unlock; |
| 381 | } |
| 382 | |
| 383 | /* Is this structure just waiting around for us to actually |
| 384 | * get destroyed? |
| 385 | */ |
| 386 | if (transport->dead) |
| 387 | goto out_unlock; |
| 388 | |
| 389 | error = sctp_do_sm(SCTP_EVENT_T_TIMEOUT, |
| 390 | SCTP_ST_TIMEOUT(SCTP_EVENT_TIMEOUT_HEARTBEAT), |
| 391 | asoc->state, asoc->ep, asoc, |
| 392 | transport, GFP_ATOMIC); |
| 393 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 394 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | asoc->base.sk->sk_err = -error; |
| 396 | |
| 397 | out_unlock: |
| 398 | sctp_bh_unlock_sock(asoc->base.sk); |
| 399 | sctp_transport_put(transport); |
| 400 | } |
| 401 | |
Vlad Yasevich | 50b5d6a | 2010-05-06 00:56:07 -0700 | [diff] [blame] | 402 | /* Handle the timeout of the ICMP protocol unreachable timer. Trigger |
| 403 | * the correct state machine transition that will close the association. |
| 404 | */ |
| 405 | void sctp_generate_proto_unreach_event(unsigned long data) |
| 406 | { |
| 407 | struct sctp_transport *transport = (struct sctp_transport *) data; |
| 408 | struct sctp_association *asoc = transport->asoc; |
| 409 | |
| 410 | sctp_bh_lock_sock(asoc->base.sk); |
| 411 | if (sock_owned_by_user(asoc->base.sk)) { |
| 412 | SCTP_DEBUG_PRINTK("%s:Sock is busy.\n", __func__); |
| 413 | |
| 414 | /* Try again later. */ |
| 415 | if (!mod_timer(&transport->proto_unreach_timer, |
| 416 | jiffies + (HZ/20))) |
| 417 | sctp_association_hold(asoc); |
| 418 | goto out_unlock; |
| 419 | } |
| 420 | |
| 421 | /* Is this structure just waiting around for us to actually |
| 422 | * get destroyed? |
| 423 | */ |
| 424 | if (asoc->base.dead) |
| 425 | goto out_unlock; |
| 426 | |
| 427 | sctp_do_sm(SCTP_EVENT_T_OTHER, |
| 428 | SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH), |
| 429 | asoc->state, asoc->ep, asoc, transport, GFP_ATOMIC); |
| 430 | |
| 431 | out_unlock: |
| 432 | sctp_bh_unlock_sock(asoc->base.sk); |
| 433 | sctp_association_put(asoc); |
| 434 | } |
| 435 | |
| 436 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | /* Inject a SACK Timeout event into the state machine. */ |
| 438 | static void sctp_generate_sack_event(unsigned long data) |
| 439 | { |
| 440 | struct sctp_association *asoc = (struct sctp_association *) data; |
| 441 | sctp_generate_timeout_event(asoc, SCTP_EVENT_TIMEOUT_SACK); |
| 442 | } |
| 443 | |
| 444 | sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES] = { |
| 445 | NULL, |
| 446 | sctp_generate_t1_cookie_event, |
| 447 | sctp_generate_t1_init_event, |
| 448 | sctp_generate_t2_shutdown_event, |
| 449 | NULL, |
| 450 | sctp_generate_t4_rto_event, |
| 451 | sctp_generate_t5_shutdown_guard_event, |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 452 | NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | sctp_generate_sack_event, |
| 454 | sctp_generate_autoclose_event, |
| 455 | }; |
| 456 | |
| 457 | |
| 458 | /* RFC 2960 8.2 Path Failure Detection |
| 459 | * |
| 460 | * When its peer endpoint is multi-homed, an endpoint should keep a |
| 461 | * error counter for each of the destination transport addresses of the |
| 462 | * peer endpoint. |
| 463 | * |
| 464 | * Each time the T3-rtx timer expires on any address, or when a |
| 465 | * HEARTBEAT sent to an idle address is not acknowledged within a RTO, |
| 466 | * the error counter of that destination address will be incremented. |
| 467 | * When the value in the error counter exceeds the protocol parameter |
| 468 | * 'Path.Max.Retrans' of that destination address, the endpoint should |
| 469 | * mark the destination transport address as inactive, and a |
| 470 | * notification SHOULD be sent to the upper layer. |
| 471 | * |
| 472 | */ |
| 473 | static void sctp_do_8_2_transport_strike(struct sctp_association *asoc, |
Vlad Yasevich | 7e99013 | 2009-03-02 09:46:14 +0000 | [diff] [blame] | 474 | struct sctp_transport *transport, |
| 475 | int is_hb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | { |
| 477 | /* The check for association's overall error counter exceeding the |
| 478 | * threshold is done in the state function. |
| 479 | */ |
Vlad Yasevich | b9f8478 | 2009-08-26 09:36:25 -0400 | [diff] [blame] | 480 | /* We are here due to a timer expiration. If the timer was |
| 481 | * not a HEARTBEAT, then normal error tracking is done. |
| 482 | * If the timer was a heartbeat, we only increment error counts |
| 483 | * when we already have an outstanding HEARTBEAT that has not |
| 484 | * been acknowledged. |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 485 | * Additionally, some tranport states inhibit error increments. |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 486 | */ |
Vlad Yasevich | b9f8478 | 2009-08-26 09:36:25 -0400 | [diff] [blame] | 487 | if (!is_hb) { |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 488 | asoc->overall_error_count++; |
Vlad Yasevich | b9f8478 | 2009-08-26 09:36:25 -0400 | [diff] [blame] | 489 | if (transport->state != SCTP_INACTIVE) |
| 490 | transport->error_count++; |
| 491 | } else if (transport->hb_sent) { |
| 492 | if (transport->state != SCTP_UNCONFIRMED) |
| 493 | asoc->overall_error_count++; |
| 494 | if (transport->state != SCTP_INACTIVE) |
| 495 | transport->error_count++; |
| 496 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 498 | if (transport->state != SCTP_INACTIVE && |
Vlad Yasevich | b9f8478 | 2009-08-26 09:36:25 -0400 | [diff] [blame] | 499 | (transport->error_count > transport->pathmaxrxt)) { |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 500 | SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p", |
| 501 | " transport IP: port:%d failed.\n", |
| 502 | asoc, |
Al Viro | b3f5b3b | 2006-11-20 17:22:43 -0800 | [diff] [blame] | 503 | (&transport->ipaddr), |
| 504 | ntohs(transport->ipaddr.v4.sin_port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | sctp_assoc_control_transport(asoc, transport, |
| 506 | SCTP_TRANSPORT_DOWN, |
| 507 | SCTP_FAILED_THRESHOLD); |
| 508 | } |
| 509 | |
| 510 | /* E2) For the destination address for which the timer |
| 511 | * expires, set RTO <- RTO * 2 ("back off the timer"). The |
| 512 | * maximum value discussed in rule C7 above (RTO.max) may be |
| 513 | * used to provide an upper bound to this doubling operation. |
Vlad Yasevich | faee47c | 2009-02-13 08:33:43 +0000 | [diff] [blame] | 514 | * |
| 515 | * Special Case: the first HB doesn't trigger exponential backoff. |
Daniel Mack | 3ad2f3f | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 516 | * The first unacknowledged HB triggers it. We do this with a flag |
Vlad Yasevich | faee47c | 2009-02-13 08:33:43 +0000 | [diff] [blame] | 517 | * that indicates that we have an outstanding HB. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | */ |
Vlad Yasevich | 7e99013 | 2009-03-02 09:46:14 +0000 | [diff] [blame] | 519 | if (!is_hb || transport->hb_sent) { |
Vlad Yasevich | faee47c | 2009-02-13 08:33:43 +0000 | [diff] [blame] | 520 | transport->rto = min((transport->rto * 2), transport->asoc->rto_max); |
| 521 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | } |
| 523 | |
| 524 | /* Worker routine to handle INIT command failure. */ |
| 525 | static void sctp_cmd_init_failed(sctp_cmd_seq_t *commands, |
| 526 | struct sctp_association *asoc, |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 527 | unsigned int error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | { |
| 529 | struct sctp_ulpevent *event; |
| 530 | |
| 531 | event = sctp_ulpevent_make_assoc_change(asoc,0, SCTP_CANT_STR_ASSOC, |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 532 | (__u16)error, 0, 0, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | GFP_ATOMIC); |
| 534 | |
| 535 | if (event) |
| 536 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
| 537 | SCTP_ULPEVENT(event)); |
| 538 | |
| 539 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
| 540 | SCTP_STATE(SCTP_STATE_CLOSED)); |
| 541 | |
| 542 | /* SEND_FAILED sent later when cleaning up the association. */ |
| 543 | asoc->outqueue.error = error; |
| 544 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
| 545 | } |
| 546 | |
| 547 | /* Worker routine to handle SCTP_CMD_ASSOC_FAILED. */ |
| 548 | static void sctp_cmd_assoc_failed(sctp_cmd_seq_t *commands, |
| 549 | struct sctp_association *asoc, |
| 550 | sctp_event_t event_type, |
| 551 | sctp_subtype_t subtype, |
| 552 | struct sctp_chunk *chunk, |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 553 | unsigned int error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | { |
| 555 | struct sctp_ulpevent *event; |
| 556 | |
| 557 | /* Cancel any partial delivery in progress. */ |
| 558 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); |
| 559 | |
Vlad Yasevich | a5a35e7 | 2007-03-23 11:34:08 -0700 | [diff] [blame] | 560 | if (event_type == SCTP_EVENT_T_CHUNK && subtype.chunk == SCTP_CID_ABORT) |
| 561 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, |
| 562 | (__u16)error, 0, 0, chunk, |
| 563 | GFP_ATOMIC); |
| 564 | else |
| 565 | event = sctp_ulpevent_make_assoc_change(asoc, 0, SCTP_COMM_LOST, |
| 566 | (__u16)error, 0, 0, NULL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | GFP_ATOMIC); |
| 568 | if (event) |
| 569 | sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, |
| 570 | SCTP_ULPEVENT(event)); |
| 571 | |
| 572 | sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE, |
| 573 | SCTP_STATE(SCTP_STATE_CLOSED)); |
| 574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | /* SEND_FAILED sent later when cleaning up the association. */ |
| 576 | asoc->outqueue.error = error; |
| 577 | sctp_add_cmd_sf(commands, SCTP_CMD_DELETE_TCB, SCTP_NULL()); |
| 578 | } |
| 579 | |
| 580 | /* Process an init chunk (may be real INIT/INIT-ACK or an embedded INIT |
| 581 | * inside the cookie. In reality, this is only used for INIT-ACK processing |
| 582 | * since all other cases use "temporary" associations and can do all |
| 583 | * their work in statefuns directly. |
| 584 | */ |
| 585 | static int sctp_cmd_process_init(sctp_cmd_seq_t *commands, |
| 586 | struct sctp_association *asoc, |
| 587 | struct sctp_chunk *chunk, |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 588 | sctp_init_chunk_t *peer_init, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 589 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | { |
| 591 | int error; |
| 592 | |
| 593 | /* We only process the init as a sideeffect in a single |
| 594 | * case. This is when we process the INIT-ACK. If we |
| 595 | * fail during INIT processing (due to malloc problems), |
| 596 | * just return the error and stop processing the stack. |
| 597 | */ |
Wei Yongjun | de6becd | 2011-04-19 21:30:51 +0000 | [diff] [blame] | 598 | if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | error = -ENOMEM; |
| 600 | else |
| 601 | error = 0; |
| 602 | |
| 603 | return error; |
| 604 | } |
| 605 | |
| 606 | /* Helper function to break out starting up of heartbeat timers. */ |
| 607 | static void sctp_cmd_hb_timers_start(sctp_cmd_seq_t *cmds, |
| 608 | struct sctp_association *asoc) |
| 609 | { |
| 610 | struct sctp_transport *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
| 612 | /* Start a heartbeat timer for each transport on the association. |
| 613 | * hold a reference on the transport to make sure none of |
| 614 | * the needed data structures go away. |
| 615 | */ |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 616 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | |
| 618 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) |
| 619 | sctp_transport_hold(t); |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | static void sctp_cmd_hb_timers_stop(sctp_cmd_seq_t *cmds, |
| 624 | struct sctp_association *asoc) |
| 625 | { |
| 626 | struct sctp_transport *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
| 628 | /* Stop all heartbeat timers. */ |
| 629 | |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 630 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
| 631 | transports) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | if (del_timer(&t->hb_timer)) |
| 633 | sctp_transport_put(t); |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | /* Helper function to stop any pending T3-RTX timers */ |
| 638 | static void sctp_cmd_t3_rtx_timers_stop(sctp_cmd_seq_t *cmds, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 639 | struct sctp_association *asoc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | { |
| 641 | struct sctp_transport *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 643 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
| 644 | transports) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | if (timer_pending(&t->T3_rtx_timer) && |
| 646 | del_timer(&t->T3_rtx_timer)) { |
| 647 | sctp_transport_put(t); |
| 648 | } |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | |
| 653 | /* Helper function to update the heartbeat timer. */ |
| 654 | static void sctp_cmd_hb_timer_update(sctp_cmd_seq_t *cmds, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | struct sctp_transport *t) |
| 656 | { |
| 657 | /* Update the heartbeat timer. */ |
| 658 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) |
| 659 | sctp_transport_hold(t); |
| 660 | } |
| 661 | |
| 662 | /* Helper function to handle the reception of an HEARTBEAT ACK. */ |
| 663 | static void sctp_cmd_transport_on(sctp_cmd_seq_t *cmds, |
| 664 | struct sctp_association *asoc, |
| 665 | struct sctp_transport *t, |
| 666 | struct sctp_chunk *chunk) |
| 667 | { |
| 668 | sctp_sender_hb_info_t *hbinfo; |
Michio Honda | 34d2d89 | 2011-06-17 11:22:35 +0900 | [diff] [blame] | 669 | int was_unconfirmed = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
| 671 | /* 8.3 Upon the receipt of the HEARTBEAT ACK, the sender of the |
| 672 | * HEARTBEAT should clear the error counter of the destination |
| 673 | * transport address to which the HEARTBEAT was sent. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | */ |
| 675 | t->error_count = 0; |
Thomas Graf | f8d9605 | 2011-07-07 00:28:35 +0000 | [diff] [blame] | 676 | |
| 677 | /* |
| 678 | * Although RFC4960 specifies that the overall error count must |
| 679 | * be cleared when a HEARTBEAT ACK is received, we make an |
| 680 | * exception while in SHUTDOWN PENDING. If the peer keeps its |
| 681 | * window shut forever, we may never be able to transmit our |
| 682 | * outstanding data and rely on the retransmission limit be reached |
| 683 | * to shutdown the association. |
| 684 | */ |
| 685 | if (t->asoc->state != SCTP_STATE_SHUTDOWN_PENDING) |
| 686 | t->asoc->overall_error_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
Vlad Yasevich | faee47c | 2009-02-13 08:33:43 +0000 | [diff] [blame] | 688 | /* Clear the hb_sent flag to signal that we had a good |
| 689 | * acknowledgement. |
| 690 | */ |
| 691 | t->hb_sent = 0; |
| 692 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | /* Mark the destination transport address as active if it is not so |
| 694 | * marked. |
| 695 | */ |
Michio Honda | 34d2d89 | 2011-06-17 11:22:35 +0900 | [diff] [blame] | 696 | if ((t->state == SCTP_INACTIVE) || (t->state == SCTP_UNCONFIRMED)) { |
| 697 | was_unconfirmed = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP, |
| 699 | SCTP_HEARTBEAT_SUCCESS); |
Michio Honda | 34d2d89 | 2011-06-17 11:22:35 +0900 | [diff] [blame] | 700 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
| 702 | /* The receiver of the HEARTBEAT ACK should also perform an |
| 703 | * RTT measurement for that destination transport address |
| 704 | * using the time value carried in the HEARTBEAT ACK chunk. |
Vlad Yasevich | e533ca1 | 2007-01-30 14:36:14 -0800 | [diff] [blame] | 705 | * If the transport's rto_pending variable has been cleared, |
| 706 | * it was most likely due to a retransmit. However, we want |
| 707 | * to re-enable it to properly update the rto. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | */ |
Vlad Yasevich | e533ca1 | 2007-01-30 14:36:14 -0800 | [diff] [blame] | 709 | if (t->rto_pending == 0) |
| 710 | t->rto_pending = 1; |
| 711 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | hbinfo = (sctp_sender_hb_info_t *) chunk->skb->data; |
| 713 | sctp_transport_update_rto(t, (jiffies - hbinfo->sent_at)); |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 714 | |
| 715 | /* Update the heartbeat timer. */ |
| 716 | if (!mod_timer(&t->hb_timer, sctp_transport_timeout(t))) |
| 717 | sctp_transport_hold(t); |
Michio Honda | 34d2d89 | 2011-06-17 11:22:35 +0900 | [diff] [blame] | 718 | |
| 719 | if (was_unconfirmed && asoc->peer.transport_count == 1) |
| 720 | sctp_transport_immediate_rtx(t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | } |
| 722 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | /* Helper function to process the process SACK command. */ |
| 725 | static int sctp_cmd_process_sack(sctp_cmd_seq_t *cmds, |
| 726 | struct sctp_association *asoc, |
| 727 | struct sctp_sackhdr *sackh) |
| 728 | { |
Vlad Yasevich | 2e3216c | 2008-06-19 16:08:18 -0700 | [diff] [blame] | 729 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
| 731 | if (sctp_outq_sack(&asoc->outqueue, sackh)) { |
| 732 | /* There are no more TSNs awaiting SACK. */ |
| 733 | err = sctp_do_sm(SCTP_EVENT_T_OTHER, |
| 734 | SCTP_ST_OTHER(SCTP_EVENT_NO_PENDING_TSN), |
| 735 | asoc->state, asoc->ep, asoc, NULL, |
| 736 | GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | } |
| 738 | |
| 739 | return err; |
| 740 | } |
| 741 | |
| 742 | /* Helper function to set the timeout value for T2-SHUTDOWN timer and to set |
| 743 | * the transport for a shutdown chunk. |
| 744 | */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 745 | static void sctp_cmd_setup_t2(sctp_cmd_seq_t *cmds, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | struct sctp_association *asoc, |
| 747 | struct sctp_chunk *chunk) |
| 748 | { |
| 749 | struct sctp_transport *t; |
| 750 | |
Vlad Yasevich | c17b02b | 2010-04-30 21:42:43 -0400 | [diff] [blame] | 751 | if (chunk->transport) |
| 752 | t = chunk->transport; |
| 753 | else { |
| 754 | t = sctp_assoc_choose_alter_transport(asoc, |
Wei Yongjun | 9919b45 | 2009-05-12 21:52:51 +0800 | [diff] [blame] | 755 | asoc->shutdown_last_sent_to); |
Vlad Yasevich | c17b02b | 2010-04-30 21:42:43 -0400 | [diff] [blame] | 756 | chunk->transport = t; |
| 757 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | asoc->shutdown_last_sent_to = t; |
| 759 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = t->rto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | } |
| 761 | |
| 762 | /* Helper function to change the state of an association. */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 763 | static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | struct sctp_association *asoc, |
| 765 | sctp_state_t state) |
| 766 | { |
| 767 | struct sock *sk = asoc->base.sk; |
| 768 | |
| 769 | asoc->state = state; |
| 770 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 771 | SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n", |
| 772 | asoc, sctp_state_tbl[state]); |
| 773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | if (sctp_style(sk, TCP)) { |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 775 | /* Change the sk->sk_state of a TCP-style socket that has |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 776 | * successfully completed a connect() call. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | */ |
| 778 | if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED)) |
| 779 | sk->sk_state = SCTP_SS_ESTABLISHED; |
| 780 | |
| 781 | /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */ |
| 782 | if (sctp_state(asoc, SHUTDOWN_RECEIVED) && |
| 783 | sctp_sstate(sk, ESTABLISHED)) |
| 784 | sk->sk_shutdown |= RCV_SHUTDOWN; |
| 785 | } |
| 786 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 787 | if (sctp_state(asoc, COOKIE_WAIT)) { |
| 788 | /* Reset init timeouts since they may have been |
| 789 | * increased due to timer expirations. |
| 790 | */ |
| 791 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 792 | asoc->rto_initial; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 793 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 794 | asoc->rto_initial; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 795 | } |
| 796 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | if (sctp_state(asoc, ESTABLISHED) || |
| 798 | sctp_state(asoc, CLOSED) || |
| 799 | sctp_state(asoc, SHUTDOWN_RECEIVED)) { |
| 800 | /* Wake up any processes waiting in the asoc's wait queue in |
| 801 | * sctp_wait_for_connect() or sctp_wait_for_sndbuf(). |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 802 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | if (waitqueue_active(&asoc->wait)) |
| 804 | wake_up_interruptible(&asoc->wait); |
| 805 | |
| 806 | /* Wake up any processes waiting in the sk's sleep queue of |
| 807 | * a TCP-style or UDP-style peeled-off socket in |
| 808 | * sctp_wait_for_accept() or sctp_wait_for_packet(). |
| 809 | * For a UDP-style socket, the waiters are woken up by the |
| 810 | * notifications. |
| 811 | */ |
| 812 | if (!sctp_style(sk, UDP)) |
| 813 | sk->sk_state_change(sk); |
| 814 | } |
| 815 | } |
| 816 | |
| 817 | /* Helper function to delete an association. */ |
| 818 | static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds, |
| 819 | struct sctp_association *asoc) |
| 820 | { |
| 821 | struct sock *sk = asoc->base.sk; |
| 822 | |
| 823 | /* If it is a non-temporary association belonging to a TCP-style |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 824 | * listening socket that is not closed, do not free it so that accept() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | * can pick it up later. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 826 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING) && |
| 828 | (!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK)) |
| 829 | return; |
| 830 | |
| 831 | sctp_unhash_established(asoc); |
| 832 | sctp_association_free(asoc); |
| 833 | } |
| 834 | |
| 835 | /* |
| 836 | * ADDIP Section 4.1 ASCONF Chunk Procedures |
| 837 | * A4) Start a T-4 RTO timer, using the RTO value of the selected |
| 838 | * destination address (we use active path instead of primary path just |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 839 | * because primary path may be inactive. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | */ |
| 841 | static void sctp_cmd_setup_t4(sctp_cmd_seq_t *cmds, |
| 842 | struct sctp_association *asoc, |
| 843 | struct sctp_chunk *chunk) |
| 844 | { |
| 845 | struct sctp_transport *t; |
| 846 | |
Wei Yongjun | 9919b45 | 2009-05-12 21:52:51 +0800 | [diff] [blame] | 847 | t = sctp_assoc_choose_alter_transport(asoc, chunk->transport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = t->rto; |
| 849 | chunk->transport = t; |
| 850 | } |
| 851 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 852 | /* Process an incoming Operation Error Chunk. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | static void sctp_cmd_process_operr(sctp_cmd_seq_t *cmds, |
| 854 | struct sctp_association *asoc, |
| 855 | struct sctp_chunk *chunk) |
| 856 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | struct sctp_errhdr *err_hdr; |
Wei Yongjun | 3df2678 | 2009-03-02 06:46:51 +0000 | [diff] [blame] | 858 | struct sctp_ulpevent *ev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | |
Wei Yongjun | 3df2678 | 2009-03-02 06:46:51 +0000 | [diff] [blame] | 860 | while (chunk->chunk_end > chunk->skb->data) { |
| 861 | err_hdr = (struct sctp_errhdr *)(chunk->skb->data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | |
Wei Yongjun | 3df2678 | 2009-03-02 06:46:51 +0000 | [diff] [blame] | 863 | ev = sctp_ulpevent_make_remote_error(asoc, chunk, 0, |
| 864 | GFP_ATOMIC); |
| 865 | if (!ev) |
| 866 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
Wei Yongjun | 3df2678 | 2009-03-02 06:46:51 +0000 | [diff] [blame] | 868 | sctp_ulpq_tail_event(&asoc->ulpq, ev); |
| 869 | |
| 870 | switch (err_hdr->cause) { |
| 871 | case SCTP_ERROR_UNKNOWN_CHUNK: |
| 872 | { |
| 873 | sctp_chunkhdr_t *unk_chunk_hdr; |
| 874 | |
| 875 | unk_chunk_hdr = (sctp_chunkhdr_t *)err_hdr->variable; |
| 876 | switch (unk_chunk_hdr->type) { |
| 877 | /* ADDIP 4.1 A9) If the peer responds to an ASCONF with |
| 878 | * an ERROR chunk reporting that it did not recognized |
| 879 | * the ASCONF chunk type, the sender of the ASCONF MUST |
| 880 | * NOT send any further ASCONF chunks and MUST stop its |
| 881 | * T-4 timer. |
| 882 | */ |
| 883 | case SCTP_CID_ASCONF: |
| 884 | if (asoc->peer.asconf_capable == 0) |
| 885 | break; |
| 886 | |
| 887 | asoc->peer.asconf_capable = 0; |
| 888 | sctp_add_cmd_sf(cmds, SCTP_CMD_TIMER_STOP, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | SCTP_TO(SCTP_EVENT_TIMEOUT_T4_RTO)); |
Wei Yongjun | 3df2678 | 2009-03-02 06:46:51 +0000 | [diff] [blame] | 890 | break; |
| 891 | default: |
| 892 | break; |
| 893 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | break; |
Wei Yongjun | 3df2678 | 2009-03-02 06:46:51 +0000 | [diff] [blame] | 895 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | default: |
| 897 | break; |
| 898 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | } |
| 900 | } |
| 901 | |
| 902 | /* Process variable FWDTSN chunk information. */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 903 | static void sctp_cmd_process_fwdtsn(struct sctp_ulpq *ulpq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | struct sctp_chunk *chunk) |
| 905 | { |
| 906 | struct sctp_fwdtsn_skip *skip; |
| 907 | /* Walk through all the skipped SSNs */ |
| 908 | sctp_walk_fwdtsn(skip, chunk) { |
| 909 | sctp_ulpq_skip(ulpq, ntohs(skip->stream), ntohs(skip->ssn)); |
| 910 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | } |
| 912 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 913 | /* Helper function to remove the association non-primary peer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | * transports. |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 915 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | static void sctp_cmd_del_non_primary(struct sctp_association *asoc) |
| 917 | { |
| 918 | struct sctp_transport *t; |
| 919 | struct list_head *pos; |
| 920 | struct list_head *temp; |
| 921 | |
| 922 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 923 | t = list_entry(pos, struct sctp_transport, transports); |
Al Viro | 5f242a1 | 2006-11-20 17:05:23 -0800 | [diff] [blame] | 924 | if (!sctp_cmp_addr_exact(&t->ipaddr, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 925 | &asoc->peer.primary_addr)) { |
Al Viro | 38a0314 | 2006-11-20 17:06:45 -0800 | [diff] [blame] | 926 | sctp_assoc_del_peer(asoc, &t->ipaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | } |
| 928 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | } |
| 930 | |
Sridhar Samudrala | 8de8c87 | 2006-05-19 10:58:12 -0700 | [diff] [blame] | 931 | /* Helper function to set sk_err on a 1-1 style socket. */ |
| 932 | static void sctp_cmd_set_sk_err(struct sctp_association *asoc, int error) |
| 933 | { |
| 934 | struct sock *sk = asoc->base.sk; |
| 935 | |
| 936 | if (!sctp_style(sk, UDP)) |
| 937 | sk->sk_err = error; |
| 938 | } |
| 939 | |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 940 | /* Helper function to generate an association change event */ |
| 941 | static void sctp_cmd_assoc_change(sctp_cmd_seq_t *commands, |
| 942 | struct sctp_association *asoc, |
| 943 | u8 state) |
| 944 | { |
| 945 | struct sctp_ulpevent *ev; |
| 946 | |
| 947 | ev = sctp_ulpevent_make_assoc_change(asoc, 0, state, 0, |
| 948 | asoc->c.sinit_num_ostreams, |
| 949 | asoc->c.sinit_max_instreams, |
| 950 | NULL, GFP_ATOMIC); |
| 951 | if (ev) |
| 952 | sctp_ulpq_tail_event(&asoc->ulpq, ev); |
| 953 | } |
| 954 | |
| 955 | /* Helper function to generate an adaptation indication event */ |
| 956 | static void sctp_cmd_adaptation_ind(sctp_cmd_seq_t *commands, |
| 957 | struct sctp_association *asoc) |
| 958 | { |
| 959 | struct sctp_ulpevent *ev; |
| 960 | |
| 961 | ev = sctp_ulpevent_make_adaptation_indication(asoc, GFP_ATOMIC); |
| 962 | |
| 963 | if (ev) |
| 964 | sctp_ulpq_tail_event(&asoc->ulpq, ev); |
| 965 | } |
| 966 | |
Vlad Yasevich | 96cd0d3 | 2008-09-08 14:00:26 -0400 | [diff] [blame] | 967 | |
| 968 | static void sctp_cmd_t1_timer_update(struct sctp_association *asoc, |
| 969 | sctp_event_timeout_t timer, |
| 970 | char *name) |
| 971 | { |
| 972 | struct sctp_transport *t; |
| 973 | |
| 974 | t = asoc->init_last_sent_to; |
| 975 | asoc->init_err_counter++; |
| 976 | |
| 977 | if (t->init_sent_count > (asoc->init_cycle + 1)) { |
| 978 | asoc->timeouts[timer] *= 2; |
| 979 | if (asoc->timeouts[timer] > asoc->max_init_timeo) { |
| 980 | asoc->timeouts[timer] = asoc->max_init_timeo; |
| 981 | } |
| 982 | asoc->init_cycle++; |
| 983 | SCTP_DEBUG_PRINTK( |
| 984 | "T1 %s Timeout adjustment" |
| 985 | " init_err_counter: %d" |
| 986 | " cycle: %d" |
| 987 | " timeout: %ld\n", |
| 988 | name, |
| 989 | asoc->init_err_counter, |
| 990 | asoc->init_cycle, |
| 991 | asoc->timeouts[timer]); |
| 992 | } |
| 993 | |
| 994 | } |
| 995 | |
Vlad Yasevich | 9c5c62b | 2009-08-10 13:51:03 -0400 | [diff] [blame] | 996 | /* Send the whole message, chunk by chunk, to the outqueue. |
| 997 | * This way the whole message is queued up and bundling if |
| 998 | * encouraged for small fragments. |
| 999 | */ |
| 1000 | static int sctp_cmd_send_msg(struct sctp_association *asoc, |
| 1001 | struct sctp_datamsg *msg) |
| 1002 | { |
| 1003 | struct sctp_chunk *chunk; |
| 1004 | int error = 0; |
| 1005 | |
| 1006 | list_for_each_entry(chunk, &msg->chunks, frag_list) { |
| 1007 | error = sctp_outq_tail(&asoc->outqueue, chunk); |
| 1008 | if (error) |
| 1009 | break; |
| 1010 | } |
| 1011 | |
| 1012 | return error; |
| 1013 | } |
| 1014 | |
| 1015 | |
Vlad Yasevich | c078669 | 2010-04-28 08:47:22 +0000 | [diff] [blame] | 1016 | /* Sent the next ASCONF packet currently stored in the association. |
| 1017 | * This happens after the ASCONF_ACK was succeffully processed. |
| 1018 | */ |
| 1019 | static void sctp_cmd_send_asconf(struct sctp_association *asoc) |
| 1020 | { |
| 1021 | /* Send the next asconf chunk from the addip chunk |
| 1022 | * queue. |
| 1023 | */ |
| 1024 | if (!list_empty(&asoc->addip_chunk_list)) { |
| 1025 | struct list_head *entry = asoc->addip_chunk_list.next; |
| 1026 | struct sctp_chunk *asconf = list_entry(entry, |
| 1027 | struct sctp_chunk, list); |
| 1028 | list_del_init(entry); |
| 1029 | |
| 1030 | /* Hold the chunk until an ASCONF_ACK is received. */ |
| 1031 | sctp_chunk_hold(asconf); |
| 1032 | if (sctp_primitive_ASCONF(asoc, asconf)) |
| 1033 | sctp_chunk_free(asconf); |
| 1034 | else |
| 1035 | asoc->addip_last_asconf = asconf; |
| 1036 | } |
| 1037 | } |
| 1038 | |
Vlad Yasevich | 9c5c62b | 2009-08-10 13:51:03 -0400 | [diff] [blame] | 1039 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | /* These three macros allow us to pull the debugging code out of the |
| 1041 | * main flow of sctp_do_sm() to keep attention focused on the real |
| 1042 | * functionality there. |
| 1043 | */ |
| 1044 | #define DEBUG_PRE \ |
| 1045 | SCTP_DEBUG_PRINTK("sctp_do_sm prefn: " \ |
| 1046 | "ep %p, %s, %s, asoc %p[%s], %s\n", \ |
| 1047 | ep, sctp_evttype_tbl[event_type], \ |
| 1048 | (*debug_fn)(subtype), asoc, \ |
| 1049 | sctp_state_tbl[state], state_fn->name) |
| 1050 | |
| 1051 | #define DEBUG_POST \ |
| 1052 | SCTP_DEBUG_PRINTK("sctp_do_sm postfn: " \ |
| 1053 | "asoc %p, status: %s\n", \ |
| 1054 | asoc, sctp_status_tbl[status]) |
| 1055 | |
| 1056 | #define DEBUG_POST_SFX \ |
| 1057 | SCTP_DEBUG_PRINTK("sctp_do_sm post sfx: error %d, asoc %p[%s]\n", \ |
| 1058 | error, asoc, \ |
| 1059 | sctp_state_tbl[(asoc && sctp_id2assoc(ep->base.sk, \ |
| 1060 | sctp_assoc2id(asoc)))?asoc->state:SCTP_STATE_CLOSED]) |
| 1061 | |
| 1062 | /* |
| 1063 | * This is the master state machine processing function. |
| 1064 | * |
| 1065 | * If you want to understand all of lksctp, this is a |
| 1066 | * good place to start. |
| 1067 | */ |
| 1068 | int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype, |
| 1069 | sctp_state_t state, |
| 1070 | struct sctp_endpoint *ep, |
| 1071 | struct sctp_association *asoc, |
| 1072 | void *event_arg, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1073 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | { |
| 1075 | sctp_cmd_seq_t commands; |
| 1076 | const sctp_sm_table_entry_t *state_fn; |
| 1077 | sctp_disposition_t status; |
| 1078 | int error = 0; |
| 1079 | typedef const char *(printfn_t)(sctp_subtype_t); |
| 1080 | |
| 1081 | static printfn_t *table[] = { |
| 1082 | NULL, sctp_cname, sctp_tname, sctp_oname, sctp_pname, |
| 1083 | }; |
| 1084 | printfn_t *debug_fn __attribute__ ((unused)) = table[event_type]; |
| 1085 | |
| 1086 | /* Look up the state function, run it, and then process the |
| 1087 | * side effects. These three steps are the heart of lksctp. |
| 1088 | */ |
| 1089 | state_fn = sctp_sm_lookup_event(event_type, state, subtype); |
| 1090 | |
| 1091 | sctp_init_cmd_seq(&commands); |
| 1092 | |
| 1093 | DEBUG_PRE; |
| 1094 | status = (*state_fn->fn)(ep, asoc, subtype, event_arg, &commands); |
| 1095 | DEBUG_POST; |
| 1096 | |
| 1097 | error = sctp_side_effects(event_type, subtype, state, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1098 | ep, asoc, event_arg, status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | &commands, gfp); |
| 1100 | DEBUG_POST_SFX; |
| 1101 | |
| 1102 | return error; |
| 1103 | } |
| 1104 | |
| 1105 | #undef DEBUG_PRE |
| 1106 | #undef DEBUG_POST |
| 1107 | |
| 1108 | /***************************************************************** |
| 1109 | * This the master state function side effect processing function. |
| 1110 | *****************************************************************/ |
| 1111 | static int sctp_side_effects(sctp_event_t event_type, sctp_subtype_t subtype, |
| 1112 | sctp_state_t state, |
| 1113 | struct sctp_endpoint *ep, |
| 1114 | struct sctp_association *asoc, |
| 1115 | void *event_arg, |
| 1116 | sctp_disposition_t status, |
| 1117 | sctp_cmd_seq_t *commands, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1118 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | { |
| 1120 | int error; |
| 1121 | |
| 1122 | /* FIXME - Most of the dispositions left today would be categorized |
| 1123 | * as "exceptional" dispositions. For those dispositions, it |
| 1124 | * may not be proper to run through any of the commands at all. |
| 1125 | * For example, the command interpreter might be run only with |
| 1126 | * disposition SCTP_DISPOSITION_CONSUME. |
| 1127 | */ |
| 1128 | if (0 != (error = sctp_cmd_interpreter(event_type, subtype, state, |
| 1129 | ep, asoc, |
| 1130 | event_arg, status, |
| 1131 | commands, gfp))) |
| 1132 | goto bail; |
| 1133 | |
| 1134 | switch (status) { |
| 1135 | case SCTP_DISPOSITION_DISCARD: |
| 1136 | SCTP_DEBUG_PRINTK("Ignored sctp protocol event - state %d, " |
| 1137 | "event_type %d, event_id %d\n", |
| 1138 | state, event_type, subtype.chunk); |
| 1139 | break; |
| 1140 | |
| 1141 | case SCTP_DISPOSITION_NOMEM: |
| 1142 | /* We ran out of memory, so we need to discard this |
| 1143 | * packet. |
| 1144 | */ |
| 1145 | /* BUG--we should now recover some memory, probably by |
| 1146 | * reneging... |
| 1147 | */ |
| 1148 | error = -ENOMEM; |
| 1149 | break; |
| 1150 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1151 | case SCTP_DISPOSITION_DELETE_TCB: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | /* This should now be a command. */ |
| 1153 | break; |
| 1154 | |
| 1155 | case SCTP_DISPOSITION_CONSUME: |
| 1156 | case SCTP_DISPOSITION_ABORT: |
| 1157 | /* |
| 1158 | * We should no longer have much work to do here as the |
| 1159 | * real work has been done as explicit commands above. |
| 1160 | */ |
| 1161 | break; |
| 1162 | |
| 1163 | case SCTP_DISPOSITION_VIOLATION: |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1164 | net_err_ratelimited("protocol violation state %d chunkid %d\n", |
| 1165 | state, subtype.chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | break; |
| 1167 | |
| 1168 | case SCTP_DISPOSITION_NOT_IMPL: |
Joe Perches | 145ce50 | 2010-08-24 13:21:08 +0000 | [diff] [blame] | 1169 | pr_warn("unimplemented feature in state %d, event_type %d, event_id %d\n", |
| 1170 | state, event_type, subtype.chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | break; |
| 1172 | |
| 1173 | case SCTP_DISPOSITION_BUG: |
Joe Perches | 145ce50 | 2010-08-24 13:21:08 +0000 | [diff] [blame] | 1174 | pr_err("bug in state %d, event_type %d, event_id %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | state, event_type, subtype.chunk); |
| 1176 | BUG(); |
| 1177 | break; |
| 1178 | |
| 1179 | default: |
Joe Perches | 145ce50 | 2010-08-24 13:21:08 +0000 | [diff] [blame] | 1180 | pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | status, state, event_type, subtype.chunk); |
| 1182 | BUG(); |
| 1183 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 1184 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | |
| 1186 | bail: |
| 1187 | return error; |
| 1188 | } |
| 1189 | |
| 1190 | /******************************************************************** |
| 1191 | * 2nd Level Abstractions |
| 1192 | ********************************************************************/ |
| 1193 | |
| 1194 | /* This is the side-effect interpreter. */ |
| 1195 | static int sctp_cmd_interpreter(sctp_event_t event_type, |
| 1196 | sctp_subtype_t subtype, |
| 1197 | sctp_state_t state, |
| 1198 | struct sctp_endpoint *ep, |
| 1199 | struct sctp_association *asoc, |
| 1200 | void *event_arg, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1201 | sctp_disposition_t status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | sctp_cmd_seq_t *commands, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1203 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | { |
| 1205 | int error = 0; |
| 1206 | int force; |
| 1207 | sctp_cmd_t *cmd; |
| 1208 | struct sctp_chunk *new_obj; |
| 1209 | struct sctp_chunk *chunk = NULL; |
| 1210 | struct sctp_packet *packet; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | struct timer_list *timer; |
| 1212 | unsigned long timeout; |
| 1213 | struct sctp_transport *t; |
| 1214 | struct sctp_sackhdr sackh; |
| 1215 | int local_cork = 0; |
| 1216 | |
| 1217 | if (SCTP_EVENT_T_TIMEOUT != event_type) |
Joe Perches | ea11073 | 2011-06-13 16:21:26 +0000 | [diff] [blame] | 1218 | chunk = event_arg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | |
| 1220 | /* Note: This whole file is a huge candidate for rework. |
| 1221 | * For example, each command could either have its own handler, so |
| 1222 | * the loop would look like: |
| 1223 | * while (cmds) |
| 1224 | * cmd->handle(x, y, z) |
| 1225 | * --jgrimm |
| 1226 | */ |
| 1227 | while (NULL != (cmd = sctp_next_cmd(commands))) { |
| 1228 | switch (cmd->verb) { |
| 1229 | case SCTP_CMD_NOP: |
| 1230 | /* Do nothing. */ |
| 1231 | break; |
| 1232 | |
| 1233 | case SCTP_CMD_NEW_ASOC: |
| 1234 | /* Register a new association. */ |
| 1235 | if (local_cork) { |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1236 | sctp_outq_uncork(&asoc->outqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | local_cork = 0; |
| 1238 | } |
| 1239 | asoc = cmd->obj.ptr; |
| 1240 | /* Register with the endpoint. */ |
| 1241 | sctp_endpoint_add_asoc(ep, asoc); |
| 1242 | sctp_hash_established(asoc); |
| 1243 | break; |
| 1244 | |
| 1245 | case SCTP_CMD_UPDATE_ASSOC: |
| 1246 | sctp_assoc_update(asoc, cmd->obj.ptr); |
| 1247 | break; |
| 1248 | |
| 1249 | case SCTP_CMD_PURGE_OUTQUEUE: |
| 1250 | sctp_outq_teardown(&asoc->outqueue); |
| 1251 | break; |
| 1252 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1253 | case SCTP_CMD_DELETE_TCB: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | if (local_cork) { |
| 1255 | sctp_outq_uncork(&asoc->outqueue); |
| 1256 | local_cork = 0; |
| 1257 | } |
| 1258 | /* Delete the current association. */ |
| 1259 | sctp_cmd_delete_tcb(commands, asoc); |
| 1260 | asoc = NULL; |
| 1261 | break; |
| 1262 | |
| 1263 | case SCTP_CMD_NEW_STATE: |
| 1264 | /* Enter a new state. */ |
| 1265 | sctp_cmd_new_state(commands, asoc, cmd->obj.state); |
| 1266 | break; |
| 1267 | |
| 1268 | case SCTP_CMD_REPORT_TSN: |
| 1269 | /* Record the arrival of a TSN. */ |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 1270 | error = sctp_tsnmap_mark(&asoc->peer.tsn_map, |
| 1271 | cmd->obj.u32); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | break; |
| 1273 | |
| 1274 | case SCTP_CMD_REPORT_FWDTSN: |
| 1275 | /* Move the Cumulattive TSN Ack ahead. */ |
| 1276 | sctp_tsnmap_skip(&asoc->peer.tsn_map, cmd->obj.u32); |
| 1277 | |
Vlad Yasevich | ea2dfb3 | 2007-07-13 17:01:19 -0400 | [diff] [blame] | 1278 | /* purge the fragmentation queue */ |
| 1279 | sctp_ulpq_reasm_flushtsn(&asoc->ulpq, cmd->obj.u32); |
| 1280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | /* Abort any in progress partial delivery. */ |
| 1282 | sctp_ulpq_abort_pd(&asoc->ulpq, GFP_ATOMIC); |
| 1283 | break; |
| 1284 | |
| 1285 | case SCTP_CMD_PROCESS_FWDTSN: |
| 1286 | sctp_cmd_process_fwdtsn(&asoc->ulpq, cmd->obj.ptr); |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1287 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | |
| 1289 | case SCTP_CMD_GEN_SACK: |
| 1290 | /* Generate a Selective ACK. |
| 1291 | * The argument tells us whether to just count |
| 1292 | * the packet and MAYBE generate a SACK, or |
| 1293 | * force a SACK out. |
| 1294 | */ |
| 1295 | force = cmd->obj.i32; |
| 1296 | error = sctp_gen_sack(asoc, force, commands); |
| 1297 | break; |
| 1298 | |
| 1299 | case SCTP_CMD_PROCESS_SACK: |
| 1300 | /* Process an inbound SACK. */ |
| 1301 | error = sctp_cmd_process_sack(commands, asoc, |
| 1302 | cmd->obj.ptr); |
| 1303 | break; |
| 1304 | |
| 1305 | case SCTP_CMD_GEN_INIT_ACK: |
| 1306 | /* Generate an INIT ACK chunk. */ |
| 1307 | new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC, |
| 1308 | 0); |
| 1309 | if (!new_obj) |
| 1310 | goto nomem; |
| 1311 | |
| 1312 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
| 1313 | SCTP_CHUNK(new_obj)); |
| 1314 | break; |
| 1315 | |
| 1316 | case SCTP_CMD_PEER_INIT: |
| 1317 | /* Process a unified INIT from the peer. |
| 1318 | * Note: Only used during INIT-ACK processing. If |
| 1319 | * there is an error just return to the outter |
| 1320 | * layer which will bail. |
| 1321 | */ |
| 1322 | error = sctp_cmd_process_init(commands, asoc, chunk, |
| 1323 | cmd->obj.ptr, gfp); |
| 1324 | break; |
| 1325 | |
| 1326 | case SCTP_CMD_GEN_COOKIE_ECHO: |
| 1327 | /* Generate a COOKIE ECHO chunk. */ |
| 1328 | new_obj = sctp_make_cookie_echo(asoc, chunk); |
| 1329 | if (!new_obj) { |
| 1330 | if (cmd->obj.ptr) |
| 1331 | sctp_chunk_free(cmd->obj.ptr); |
| 1332 | goto nomem; |
| 1333 | } |
| 1334 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
| 1335 | SCTP_CHUNK(new_obj)); |
| 1336 | |
| 1337 | /* If there is an ERROR chunk to be sent along with |
| 1338 | * the COOKIE_ECHO, send it, too. |
| 1339 | */ |
| 1340 | if (cmd->obj.ptr) |
| 1341 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
| 1342 | SCTP_CHUNK(cmd->obj.ptr)); |
| 1343 | |
Vlad Yasevich | 96cd0d3 | 2008-09-08 14:00:26 -0400 | [diff] [blame] | 1344 | if (new_obj->transport) { |
| 1345 | new_obj->transport->init_sent_count++; |
| 1346 | asoc->init_last_sent_to = new_obj->transport; |
| 1347 | } |
| 1348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | /* FIXME - Eventually come up with a cleaner way to |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1350 | * enabling COOKIE-ECHO + DATA bundling during |
| 1351 | * multihoming stale cookie scenarios, the following |
| 1352 | * command plays with asoc->peer.retran_path to |
| 1353 | * avoid the problem of sending the COOKIE-ECHO and |
| 1354 | * DATA in different paths, which could result |
| 1355 | * in the association being ABORTed if the DATA chunk |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | * is processed first by the server. Checking the |
| 1357 | * init error counter simply causes this command |
| 1358 | * to be executed only during failed attempts of |
| 1359 | * association establishment. |
| 1360 | */ |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1361 | if ((asoc->peer.retran_path != |
| 1362 | asoc->peer.primary_path) && |
| 1363 | (asoc->init_err_counter > 0)) { |
| 1364 | sctp_add_cmd_sf(commands, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1365 | SCTP_CMD_FORCE_PRIM_RETRAN, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | SCTP_NULL()); |
| 1367 | } |
| 1368 | |
| 1369 | break; |
| 1370 | |
| 1371 | case SCTP_CMD_GEN_SHUTDOWN: |
| 1372 | /* Generate SHUTDOWN when in SHUTDOWN_SENT state. |
| 1373 | * Reset error counts. |
| 1374 | */ |
| 1375 | asoc->overall_error_count = 0; |
| 1376 | |
| 1377 | /* Generate a SHUTDOWN chunk. */ |
| 1378 | new_obj = sctp_make_shutdown(asoc, chunk); |
| 1379 | if (!new_obj) |
| 1380 | goto nomem; |
| 1381 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
| 1382 | SCTP_CHUNK(new_obj)); |
| 1383 | break; |
| 1384 | |
| 1385 | case SCTP_CMD_CHUNK_ULP: |
| 1386 | /* Send a chunk to the sockets layer. */ |
| 1387 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", |
| 1388 | "chunk_up:", cmd->obj.ptr, |
| 1389 | "ulpq:", &asoc->ulpq); |
| 1390 | sctp_ulpq_tail_data(&asoc->ulpq, cmd->obj.ptr, |
| 1391 | GFP_ATOMIC); |
| 1392 | break; |
| 1393 | |
| 1394 | case SCTP_CMD_EVENT_ULP: |
| 1395 | /* Send a notification to the sockets layer. */ |
| 1396 | SCTP_DEBUG_PRINTK("sm_sideff: %s %p, %s %p.\n", |
| 1397 | "event_up:",cmd->obj.ptr, |
| 1398 | "ulpq:",&asoc->ulpq); |
| 1399 | sctp_ulpq_tail_event(&asoc->ulpq, cmd->obj.ptr); |
| 1400 | break; |
| 1401 | |
| 1402 | case SCTP_CMD_REPLY: |
| 1403 | /* If an caller has not already corked, do cork. */ |
| 1404 | if (!asoc->outqueue.cork) { |
| 1405 | sctp_outq_cork(&asoc->outqueue); |
| 1406 | local_cork = 1; |
| 1407 | } |
| 1408 | /* Send a chunk to our peer. */ |
| 1409 | error = sctp_outq_tail(&asoc->outqueue, cmd->obj.ptr); |
| 1410 | break; |
| 1411 | |
| 1412 | case SCTP_CMD_SEND_PKT: |
| 1413 | /* Send a full packet to our peer. */ |
| 1414 | packet = cmd->obj.ptr; |
| 1415 | sctp_packet_transmit(packet); |
| 1416 | sctp_ootb_pkt_free(packet); |
| 1417 | break; |
| 1418 | |
Vlad Yasevich | b6157d8 | 2007-10-24 15:59:16 -0400 | [diff] [blame] | 1419 | case SCTP_CMD_T1_RETRAN: |
| 1420 | /* Mark a transport for retransmission. */ |
| 1421 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, |
| 1422 | SCTP_RTXR_T1_RTX); |
| 1423 | break; |
| 1424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | case SCTP_CMD_RETRAN: |
| 1426 | /* Mark a transport for retransmission. */ |
| 1427 | sctp_retransmit(&asoc->outqueue, cmd->obj.transport, |
| 1428 | SCTP_RTXR_T3_RTX); |
| 1429 | break; |
| 1430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | case SCTP_CMD_ECN_CE: |
| 1432 | /* Do delayed CE processing. */ |
| 1433 | sctp_do_ecn_ce_work(asoc, cmd->obj.u32); |
| 1434 | break; |
| 1435 | |
| 1436 | case SCTP_CMD_ECN_ECNE: |
| 1437 | /* Do delayed ECNE processing. */ |
| 1438 | new_obj = sctp_do_ecn_ecne_work(asoc, cmd->obj.u32, |
| 1439 | chunk); |
| 1440 | if (new_obj) |
| 1441 | sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, |
| 1442 | SCTP_CHUNK(new_obj)); |
| 1443 | break; |
| 1444 | |
| 1445 | case SCTP_CMD_ECN_CWR: |
| 1446 | /* Do delayed CWR processing. */ |
| 1447 | sctp_do_ecn_cwr_work(asoc, cmd->obj.u32); |
| 1448 | break; |
| 1449 | |
| 1450 | case SCTP_CMD_SETUP_T2: |
| 1451 | sctp_cmd_setup_t2(commands, asoc, cmd->obj.ptr); |
| 1452 | break; |
| 1453 | |
Thomas Graf | f8d9605 | 2011-07-07 00:28:35 +0000 | [diff] [blame] | 1454 | case SCTP_CMD_TIMER_START_ONCE: |
| 1455 | timer = &asoc->timers[cmd->obj.to]; |
| 1456 | |
| 1457 | if (timer_pending(timer)) |
| 1458 | break; |
| 1459 | /* fall through */ |
| 1460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | case SCTP_CMD_TIMER_START: |
| 1462 | timer = &asoc->timers[cmd->obj.to]; |
| 1463 | timeout = asoc->timeouts[cmd->obj.to]; |
Kris Katterjohn | 09a6266 | 2006-01-08 22:24:28 -0800 | [diff] [blame] | 1464 | BUG_ON(!timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | |
| 1466 | timer->expires = jiffies + timeout; |
| 1467 | sctp_association_hold(asoc); |
| 1468 | add_timer(timer); |
| 1469 | break; |
| 1470 | |
| 1471 | case SCTP_CMD_TIMER_RESTART: |
| 1472 | timer = &asoc->timers[cmd->obj.to]; |
| 1473 | timeout = asoc->timeouts[cmd->obj.to]; |
| 1474 | if (!mod_timer(timer, jiffies + timeout)) |
| 1475 | sctp_association_hold(asoc); |
| 1476 | break; |
| 1477 | |
| 1478 | case SCTP_CMD_TIMER_STOP: |
| 1479 | timer = &asoc->timers[cmd->obj.to]; |
| 1480 | if (timer_pending(timer) && del_timer(timer)) |
| 1481 | sctp_association_put(asoc); |
| 1482 | break; |
| 1483 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1484 | case SCTP_CMD_INIT_CHOOSE_TRANSPORT: |
| 1485 | chunk = cmd->obj.ptr; |
Wei Yongjun | 9919b45 | 2009-05-12 21:52:51 +0800 | [diff] [blame] | 1486 | t = sctp_assoc_choose_alter_transport(asoc, |
| 1487 | asoc->init_last_sent_to); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1488 | asoc->init_last_sent_to = t; |
| 1489 | chunk->transport = t; |
| 1490 | t->init_sent_count++; |
Vlad Yasevich | e0e9db1 | 2009-11-23 15:53:57 -0500 | [diff] [blame] | 1491 | /* Set the new transport as primary */ |
| 1492 | sctp_assoc_set_primary(asoc, t); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1493 | break; |
| 1494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | case SCTP_CMD_INIT_RESTART: |
| 1496 | /* Do the needed accounting and updates |
| 1497 | * associated with restarting an initialization |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1498 | * timer. Only multiply the timeout by two if |
| 1499 | * all transports have been tried at the current |
| 1500 | * timeout. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | */ |
Vlad Yasevich | 96cd0d3 | 2008-09-08 14:00:26 -0400 | [diff] [blame] | 1502 | sctp_cmd_t1_timer_update(asoc, |
| 1503 | SCTP_EVENT_TIMEOUT_T1_INIT, |
| 1504 | "INIT"); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1505 | |
| 1506 | sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART, |
| 1507 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT)); |
| 1508 | break; |
| 1509 | |
| 1510 | case SCTP_CMD_COOKIEECHO_RESTART: |
| 1511 | /* Do the needed accounting and updates |
| 1512 | * associated with restarting an initialization |
| 1513 | * timer. Only multiply the timeout by two if |
| 1514 | * all transports have been tried at the current |
| 1515 | * timeout. |
| 1516 | */ |
Vlad Yasevich | 96cd0d3 | 2008-09-08 14:00:26 -0400 | [diff] [blame] | 1517 | sctp_cmd_t1_timer_update(asoc, |
| 1518 | SCTP_EVENT_TIMEOUT_T1_COOKIE, |
| 1519 | "COOKIE"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | |
| 1521 | /* If we've sent any data bundled with |
| 1522 | * COOKIE-ECHO we need to resend. |
| 1523 | */ |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 1524 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
| 1525 | transports) { |
Vlad Yasevich | b6157d8 | 2007-10-24 15:59:16 -0400 | [diff] [blame] | 1526 | sctp_retransmit_mark(&asoc->outqueue, t, |
| 1527 | SCTP_RTXR_T1_RTX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | } |
| 1529 | |
| 1530 | sctp_add_cmd_sf(commands, |
| 1531 | SCTP_CMD_TIMER_RESTART, |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1532 | SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | break; |
| 1534 | |
| 1535 | case SCTP_CMD_INIT_FAILED: |
Al Viro | dc251b2 | 2006-11-20 17:00:44 -0800 | [diff] [blame] | 1536 | sctp_cmd_init_failed(commands, asoc, cmd->obj.err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | break; |
| 1538 | |
| 1539 | case SCTP_CMD_ASSOC_FAILED: |
| 1540 | sctp_cmd_assoc_failed(commands, asoc, event_type, |
Al Viro | 5be291f | 2006-11-20 17:01:06 -0800 | [diff] [blame] | 1541 | subtype, chunk, cmd->obj.err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | break; |
| 1543 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1544 | case SCTP_CMD_INIT_COUNTER_INC: |
| 1545 | asoc->init_err_counter++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | break; |
| 1547 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1548 | case SCTP_CMD_INIT_COUNTER_RESET: |
| 1549 | asoc->init_err_counter = 0; |
| 1550 | asoc->init_cycle = 0; |
Vlad Yasevich | 96cd0d3 | 2008-09-08 14:00:26 -0400 | [diff] [blame] | 1551 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
| 1552 | transports) { |
| 1553 | t->init_sent_count = 0; |
| 1554 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | break; |
| 1556 | |
| 1557 | case SCTP_CMD_REPORT_DUP: |
| 1558 | sctp_tsnmap_mark_dup(&asoc->peer.tsn_map, |
| 1559 | cmd->obj.u32); |
| 1560 | break; |
| 1561 | |
| 1562 | case SCTP_CMD_REPORT_BAD_TAG: |
| 1563 | SCTP_DEBUG_PRINTK("vtag mismatch!\n"); |
| 1564 | break; |
| 1565 | |
| 1566 | case SCTP_CMD_STRIKE: |
| 1567 | /* Mark one strike against a transport. */ |
Vlad Yasevich | 7e99013 | 2009-03-02 09:46:14 +0000 | [diff] [blame] | 1568 | sctp_do_8_2_transport_strike(asoc, cmd->obj.transport, |
| 1569 | 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | break; |
| 1571 | |
Vlad Yasevich | 7e99013 | 2009-03-02 09:46:14 +0000 | [diff] [blame] | 1572 | case SCTP_CMD_TRANSPORT_IDLE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | t = cmd->obj.transport; |
Vlad Yasevich | 7e99013 | 2009-03-02 09:46:14 +0000 | [diff] [blame] | 1574 | sctp_transport_lower_cwnd(t, SCTP_LOWER_CWND_INACTIVE); |
| 1575 | break; |
| 1576 | |
| 1577 | case SCTP_CMD_TRANSPORT_HB_SENT: |
| 1578 | t = cmd->obj.transport; |
| 1579 | sctp_do_8_2_transport_strike(asoc, t, 1); |
| 1580 | t->hb_sent = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | break; |
| 1582 | |
| 1583 | case SCTP_CMD_TRANSPORT_ON: |
| 1584 | t = cmd->obj.transport; |
| 1585 | sctp_cmd_transport_on(commands, asoc, t, chunk); |
| 1586 | break; |
| 1587 | |
| 1588 | case SCTP_CMD_HB_TIMERS_START: |
| 1589 | sctp_cmd_hb_timers_start(commands, asoc); |
| 1590 | break; |
| 1591 | |
| 1592 | case SCTP_CMD_HB_TIMER_UPDATE: |
| 1593 | t = cmd->obj.transport; |
Gui Jianfeng | 765ff02 | 2008-04-12 18:55:12 -0700 | [diff] [blame] | 1594 | sctp_cmd_hb_timer_update(commands, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | break; |
| 1596 | |
| 1597 | case SCTP_CMD_HB_TIMERS_STOP: |
| 1598 | sctp_cmd_hb_timers_stop(commands, asoc); |
| 1599 | break; |
| 1600 | |
| 1601 | case SCTP_CMD_REPORT_ERROR: |
| 1602 | error = cmd->obj.error; |
| 1603 | break; |
| 1604 | |
| 1605 | case SCTP_CMD_PROCESS_CTSN: |
| 1606 | /* Dummy up a SACK for processing. */ |
Al Viro | 2178eda | 2006-11-20 17:26:53 -0800 | [diff] [blame] | 1607 | sackh.cum_tsn_ack = cmd->obj.be32; |
Vlad Yasevich | d4d6fb5 | 2009-09-04 18:20:59 -0400 | [diff] [blame] | 1608 | sackh.a_rwnd = asoc->peer.rwnd + |
| 1609 | asoc->outqueue.outstanding_bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | sackh.num_gap_ack_blocks = 0; |
| 1611 | sackh.num_dup_tsns = 0; |
| 1612 | sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_SACK, |
| 1613 | SCTP_SACKH(&sackh)); |
| 1614 | break; |
| 1615 | |
| 1616 | case SCTP_CMD_DISCARD_PACKET: |
Vlad Yasevich | 2e3216c | 2008-06-19 16:08:18 -0700 | [diff] [blame] | 1617 | /* We need to discard the whole packet. |
| 1618 | * Uncork the queue since there might be |
| 1619 | * responses pending |
| 1620 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | chunk->pdiscard = 1; |
Vlad Yasevich | 2e3216c | 2008-06-19 16:08:18 -0700 | [diff] [blame] | 1622 | if (asoc) { |
| 1623 | sctp_outq_uncork(&asoc->outqueue); |
| 1624 | local_cork = 0; |
| 1625 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | break; |
| 1627 | |
| 1628 | case SCTP_CMD_RTO_PENDING: |
| 1629 | t = cmd->obj.transport; |
| 1630 | t->rto_pending = 1; |
| 1631 | break; |
| 1632 | |
| 1633 | case SCTP_CMD_PART_DELIVER: |
| 1634 | sctp_ulpq_partial_delivery(&asoc->ulpq, cmd->obj.ptr, |
| 1635 | GFP_ATOMIC); |
| 1636 | break; |
| 1637 | |
| 1638 | case SCTP_CMD_RENEGE: |
| 1639 | sctp_ulpq_renege(&asoc->ulpq, cmd->obj.ptr, |
| 1640 | GFP_ATOMIC); |
| 1641 | break; |
| 1642 | |
| 1643 | case SCTP_CMD_SETUP_T4: |
| 1644 | sctp_cmd_setup_t4(commands, asoc, cmd->obj.ptr); |
| 1645 | break; |
| 1646 | |
| 1647 | case SCTP_CMD_PROCESS_OPERR: |
| 1648 | sctp_cmd_process_operr(commands, asoc, chunk); |
| 1649 | break; |
| 1650 | case SCTP_CMD_CLEAR_INIT_TAG: |
| 1651 | asoc->peer.i.init_tag = 0; |
| 1652 | break; |
| 1653 | case SCTP_CMD_DEL_NON_PRIMARY: |
| 1654 | sctp_cmd_del_non_primary(asoc); |
| 1655 | break; |
| 1656 | case SCTP_CMD_T3_RTX_TIMERS_STOP: |
| 1657 | sctp_cmd_t3_rtx_timers_stop(commands, asoc); |
| 1658 | break; |
| 1659 | case SCTP_CMD_FORCE_PRIM_RETRAN: |
| 1660 | t = asoc->peer.retran_path; |
| 1661 | asoc->peer.retran_path = asoc->peer.primary_path; |
| 1662 | error = sctp_outq_uncork(&asoc->outqueue); |
| 1663 | local_cork = 0; |
| 1664 | asoc->peer.retran_path = t; |
| 1665 | break; |
Sridhar Samudrala | 8de8c87 | 2006-05-19 10:58:12 -0700 | [diff] [blame] | 1666 | case SCTP_CMD_SET_SK_ERR: |
| 1667 | sctp_cmd_set_sk_err(asoc, cmd->obj.error); |
| 1668 | break; |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1669 | case SCTP_CMD_ASSOC_CHANGE: |
| 1670 | sctp_cmd_assoc_change(commands, asoc, |
| 1671 | cmd->obj.u8); |
| 1672 | break; |
| 1673 | case SCTP_CMD_ADAPTATION_IND: |
| 1674 | sctp_cmd_adaptation_ind(commands, asoc); |
| 1675 | break; |
| 1676 | |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 1677 | case SCTP_CMD_ASSOC_SHKEY: |
| 1678 | error = sctp_auth_asoc_init_active_key(asoc, |
| 1679 | GFP_ATOMIC); |
| 1680 | break; |
Gui Jianfeng | f4ad85c | 2008-04-12 18:39:34 -0700 | [diff] [blame] | 1681 | case SCTP_CMD_UPDATE_INITTAG: |
| 1682 | asoc->peer.i.init_tag = cmd->obj.u32; |
| 1683 | break; |
Vlad Yasevich | 9c5c62b | 2009-08-10 13:51:03 -0400 | [diff] [blame] | 1684 | case SCTP_CMD_SEND_MSG: |
| 1685 | if (!asoc->outqueue.cork) { |
| 1686 | sctp_outq_cork(&asoc->outqueue); |
| 1687 | local_cork = 1; |
| 1688 | } |
| 1689 | error = sctp_cmd_send_msg(asoc, cmd->obj.msg); |
| 1690 | break; |
Vlad Yasevich | c078669 | 2010-04-28 08:47:22 +0000 | [diff] [blame] | 1691 | case SCTP_CMD_SEND_NEXT_ASCONF: |
| 1692 | sctp_cmd_send_asconf(asoc); |
| 1693 | break; |
Wei Yongjun | a000c01 | 2011-05-29 23:23:36 +0000 | [diff] [blame] | 1694 | case SCTP_CMD_PURGE_ASCONF_QUEUE: |
| 1695 | sctp_asconf_queue_teardown(asoc); |
| 1696 | break; |
Max Matveev | d5ccd49 | 2011-08-29 21:02:24 +0000 | [diff] [blame] | 1697 | |
| 1698 | case SCTP_CMD_SET_ASOC: |
| 1699 | asoc = cmd->obj.asoc; |
| 1700 | break; |
| 1701 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | default: |
Joe Perches | 145ce50 | 2010-08-24 13:21:08 +0000 | [diff] [blame] | 1703 | pr_warn("Impossible command: %u, %p\n", |
| 1704 | cmd->verb, cmd->obj.ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 1706 | } |
| 1707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | if (error) |
| 1709 | break; |
| 1710 | } |
| 1711 | |
| 1712 | out: |
Vlad Yasevich | 2e3216c | 2008-06-19 16:08:18 -0700 | [diff] [blame] | 1713 | /* If this is in response to a received chunk, wait until |
| 1714 | * we are done with the packet to open the queue so that we don't |
| 1715 | * send multiple packets in response to a single request. |
| 1716 | */ |
| 1717 | if (asoc && SCTP_EVENT_T_CHUNK == event_type && chunk) { |
| 1718 | if (chunk->end_of_packet || chunk->singleton) |
Vlad Yasevich | d4d6fb5 | 2009-09-04 18:20:59 -0400 | [diff] [blame] | 1719 | error = sctp_outq_uncork(&asoc->outqueue); |
Vlad Yasevich | 2e3216c | 2008-06-19 16:08:18 -0700 | [diff] [blame] | 1720 | } else if (local_cork) |
Vlad Yasevich | d4d6fb5 | 2009-09-04 18:20:59 -0400 | [diff] [blame] | 1721 | error = sctp_outq_uncork(&asoc->outqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | return error; |
| 1723 | nomem: |
| 1724 | error = -ENOMEM; |
| 1725 | goto out; |
| 1726 | } |
| 1727 | |