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) 1999-2000 Cisco, Inc. |
| 4 | * Copyright (c) 1999-2001 Motorola, Inc. |
| 5 | * Copyright (c) 2001 Intel Corp. |
| 6 | * Copyright (c) 2001 La Monte H.P. Yarroll |
| 7 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 8 | * This file is part of the SCTP kernel implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * |
| 10 | * This module provides the abstraction for an SCTP association. |
| 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@us.ibm.com> |
| 40 | * Xingang Guo <xingang.guo@intel.com> |
| 41 | * Hui Huang <hui.huang@nokia.com> |
| 42 | * Sridhar Samudrala <sri@us.ibm.com> |
| 43 | * Daisy Chang <daisyc@us.ibm.com> |
| 44 | * Ryan Layer <rmlayer@us.ibm.com> |
| 45 | * Kevin Gao <kevin.gao@intel.com> |
| 46 | * |
| 47 | * Any bugs reported given to us we will try to fix... any fixes shared will |
| 48 | * be incorporated into the next SCTP release. |
| 49 | */ |
| 50 | |
Joe Perches | 145ce50 | 2010-08-24 13:21:08 +0000 | [diff] [blame] | 51 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <linux/types.h> |
| 54 | #include <linux/fcntl.h> |
| 55 | #include <linux/poll.h> |
| 56 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | #include <linux/slab.h> |
| 59 | #include <linux/in.h> |
| 60 | #include <net/ipv6.h> |
| 61 | #include <net/sctp/sctp.h> |
| 62 | #include <net/sctp/sm.h> |
| 63 | |
| 64 | /* Forward declarations for internal functions. */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 65 | static void sctp_assoc_bh_rcv(struct work_struct *work); |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 66 | static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc); |
Wei Yongjun | 8b4472c | 2011-05-24 21:48:02 +0000 | [diff] [blame] | 67 | static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | /* 1st Level Abstractions. */ |
| 70 | |
| 71 | /* Initialize a new association from provided memory. */ |
| 72 | static struct sctp_association *sctp_association_init(struct sctp_association *asoc, |
| 73 | const struct sctp_endpoint *ep, |
| 74 | const struct sock *sk, |
| 75 | sctp_scope_t scope, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 76 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | { |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 78 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | struct sctp_sock *sp; |
| 80 | int i; |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 81 | sctp_paramhdr_t *p; |
| 82 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
| 84 | /* Retrieve the SCTP per socket area. */ |
| 85 | sp = sctp_sk((struct sock *)sk); |
| 86 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | /* Discarding const is appropriate here. */ |
| 88 | asoc->ep = (struct sctp_endpoint *)ep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | asoc->base.sk = (struct sock *)sk; |
Daniel Borkmann | 2e0c9e7 | 2013-06-14 18:24:07 +0200 | [diff] [blame] | 90 | |
| 91 | sctp_endpoint_hold(asoc->ep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | sock_hold(asoc->base.sk); |
| 93 | |
| 94 | /* Initialize the common base substructure. */ |
| 95 | asoc->base.type = SCTP_EP_TYPE_ASSOCIATION; |
| 96 | |
| 97 | /* Initialize the object handling fields. */ |
| 98 | atomic_set(&asoc->base.refcnt, 1); |
Daniel Borkmann | 0022d2d | 2013-04-15 03:27:18 +0000 | [diff] [blame] | 99 | asoc->base.dead = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
| 101 | /* Initialize the bind addr area. */ |
| 102 | sctp_bind_addr_init(&asoc->base.bind_addr, ep->base.bind_addr.port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | asoc->state = SCTP_STATE_CLOSED; |
Daniel Borkmann | 52db882 | 2013-06-25 18:17:27 +0200 | [diff] [blame] | 105 | asoc->cookie_life = ms_to_ktime(sp->assocparams.sasoc_cookie_life); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | asoc->frag_point = 0; |
Vlad Yasevich | f68b2e0 | 2009-09-04 18:21:00 -0400 | [diff] [blame] | 107 | asoc->user_frag = sp->user_frag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
| 109 | /* Set the association max_retrans and RTO values from the |
| 110 | * socket values. |
| 111 | */ |
| 112 | asoc->max_retrans = sp->assocparams.sasoc_asocmaxrxt; |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 113 | asoc->pf_retrans = net->sctp.pf_retrans; |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | asoc->rto_initial = msecs_to_jiffies(sp->rtoinfo.srto_initial); |
| 116 | asoc->rto_max = msecs_to_jiffies(sp->rtoinfo.srto_max); |
| 117 | asoc->rto_min = msecs_to_jiffies(sp->rtoinfo.srto_min); |
| 118 | |
| 119 | asoc->overall_error_count = 0; |
| 120 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 121 | /* Initialize the association's heartbeat interval based on the |
| 122 | * sock configured value. |
| 123 | */ |
| 124 | asoc->hbinterval = msecs_to_jiffies(sp->hbinterval); |
| 125 | |
| 126 | /* Initialize path max retrans value. */ |
| 127 | asoc->pathmaxrxt = sp->pathmaxrxt; |
| 128 | |
| 129 | /* Initialize default path MTU. */ |
| 130 | asoc->pathmtu = sp->pathmtu; |
| 131 | |
| 132 | /* Set association default SACK delay */ |
| 133 | asoc->sackdelay = msecs_to_jiffies(sp->sackdelay); |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 134 | asoc->sackfreq = sp->sackfreq; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 135 | |
| 136 | /* Set the association default flags controlling |
| 137 | * Heartbeat, SACK delay, and Path MTU Discovery. |
| 138 | */ |
| 139 | asoc->param_flags = sp->param_flags; |
| 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | /* Initialize the maximum mumber of new data packets that can be sent |
| 142 | * in a burst. |
| 143 | */ |
Vlad Yasevich | 7033157 | 2007-03-23 11:34:36 -0700 | [diff] [blame] | 144 | asoc->max_burst = sp->max_burst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 146 | /* initialize association timers */ |
| 147 | asoc->timeouts[SCTP_EVENT_TIMEOUT_NONE] = 0; |
| 148 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = asoc->rto_initial; |
| 149 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = asoc->rto_initial; |
| 150 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = asoc->rto_initial; |
| 151 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] = 0; |
| 152 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = 0; |
| 153 | |
| 154 | /* sctpimpguide Section 2.12.2 |
| 155 | * If the 'T5-shutdown-guard' timer is used, it SHOULD be set to the |
| 156 | * recommended value of 5 times 'RTO.Max'. |
| 157 | */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 158 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD] |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 159 | = 5 * asoc->rto_max; |
| 160 | |
| 161 | asoc->timeouts[SCTP_EVENT_TIMEOUT_HEARTBEAT] = 0; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 162 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = asoc->sackdelay; |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 163 | asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] = |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 164 | min_t(unsigned long, sp->autoclose, net->sctp.max_autoclose) * HZ; |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 165 | |
Uwe Kleine-König | 421f91d | 2010-06-11 12:17:00 +0200 | [diff] [blame] | 166 | /* Initializes the timers */ |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 167 | for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) |
| 168 | setup_timer(&asoc->timers[i], sctp_timer_events[i], |
| 169 | (unsigned long)asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
| 171 | /* Pull default initialization values from the sock options. |
| 172 | * Note: This assumes that the values have already been |
| 173 | * validated in the sock. |
| 174 | */ |
| 175 | asoc->c.sinit_max_instreams = sp->initmsg.sinit_max_instreams; |
| 176 | asoc->c.sinit_num_ostreams = sp->initmsg.sinit_num_ostreams; |
| 177 | asoc->max_init_attempts = sp->initmsg.sinit_max_attempts; |
| 178 | |
| 179 | asoc->max_init_timeo = |
| 180 | msecs_to_jiffies(sp->initmsg.sinit_max_init_timeo); |
| 181 | |
| 182 | /* Allocate storage for the ssnmap after the inbound and outbound |
| 183 | * streams have been negotiated during Init. |
| 184 | */ |
| 185 | asoc->ssnmap = NULL; |
| 186 | |
| 187 | /* Set the local window size for receive. |
| 188 | * This is also the rcvbuf space per association. |
| 189 | * RFC 6 - A SCTP receiver MUST be able to receive a minimum of |
| 190 | * 1500 bytes in one SCTP packet. |
| 191 | */ |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 192 | if ((sk->sk_rcvbuf/2) < SCTP_DEFAULT_MINWINDOW) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | asoc->rwnd = SCTP_DEFAULT_MINWINDOW; |
| 194 | else |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 195 | asoc->rwnd = sk->sk_rcvbuf/2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | asoc->a_rwnd = asoc->rwnd; |
| 198 | |
| 199 | asoc->rwnd_over = 0; |
Vlad Yasevich | 4d3c46e | 2009-09-04 18:20:59 -0400 | [diff] [blame] | 200 | asoc->rwnd_press = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
| 202 | /* Use my own max window until I learn something better. */ |
| 203 | asoc->peer.rwnd = SCTP_DEFAULT_MAXWINDOW; |
| 204 | |
| 205 | /* Set the sndbuf size for transmit. */ |
| 206 | asoc->sndbuf_used = 0; |
| 207 | |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 208 | /* Initialize the receive memory counter */ |
| 209 | atomic_set(&asoc->rmem_alloc, 0); |
| 210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | init_waitqueue_head(&asoc->wait); |
| 212 | |
| 213 | asoc->c.my_vtag = sctp_generate_tag(ep); |
| 214 | asoc->peer.i.init_tag = 0; /* INIT needs a vtag of 0. */ |
| 215 | asoc->c.peer_vtag = 0; |
| 216 | asoc->c.my_ttag = 0; |
| 217 | asoc->c.peer_ttag = 0; |
| 218 | asoc->c.my_port = ep->base.bind_addr.port; |
| 219 | |
| 220 | asoc->c.initial_tsn = sctp_generate_tsn(ep); |
| 221 | |
| 222 | asoc->next_tsn = asoc->c.initial_tsn; |
| 223 | |
| 224 | asoc->ctsn_ack_point = asoc->next_tsn - 1; |
| 225 | asoc->adv_peer_ack_point = asoc->ctsn_ack_point; |
| 226 | asoc->highest_sacked = asoc->ctsn_ack_point; |
| 227 | asoc->last_cwr_tsn = asoc->ctsn_ack_point; |
| 228 | asoc->unack_data = 0; |
| 229 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | /* ADDIP Section 4.1 Asconf Chunk Procedures |
| 231 | * |
| 232 | * When an endpoint has an ASCONF signaled change to be sent to the |
| 233 | * remote endpoint it should do the following: |
| 234 | * ... |
| 235 | * A2) a serial number should be assigned to the chunk. The serial |
| 236 | * number SHOULD be a monotonically increasing number. The serial |
| 237 | * numbers SHOULD be initialized at the start of the |
| 238 | * association to the same value as the initial TSN. |
| 239 | */ |
| 240 | asoc->addip_serial = asoc->c.initial_tsn; |
| 241 | |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 242 | INIT_LIST_HEAD(&asoc->addip_chunk_list); |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 243 | INIT_LIST_HEAD(&asoc->asconf_ack_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
| 245 | /* Make an empty list of remote transport addresses. */ |
| 246 | INIT_LIST_HEAD(&asoc->peer.transport_addr_list); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 247 | asoc->peer.transport_count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
| 249 | /* RFC 2960 5.1 Normal Establishment of an Association |
| 250 | * |
| 251 | * After the reception of the first data chunk in an |
| 252 | * association the endpoint must immediately respond with a |
| 253 | * sack to acknowledge the data chunk. Subsequent |
| 254 | * acknowledgements should be done as described in Section |
| 255 | * 6.2. |
| 256 | * |
| 257 | * [We implement this by telling a new association that it |
| 258 | * already received one packet.] |
| 259 | */ |
| 260 | asoc->peer.sack_needed = 1; |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 261 | asoc->peer.sack_cnt = 0; |
Neil Horman | 4244854 | 2012-06-30 03:04:26 +0000 | [diff] [blame] | 262 | asoc->peer.sack_generation = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
Vlad Yasevich | 73d9c4f | 2007-10-24 17:24:26 -0400 | [diff] [blame] | 264 | /* Assume that the peer will tell us if he recognizes ASCONF |
| 265 | * as part of INIT exchange. |
| 266 | * The sctp_addip_noauth option is there for backward compatibilty |
| 267 | * and will revert old behavior. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | */ |
Vlad Yasevich | 88799fe | 2007-10-24 17:24:23 -0400 | [diff] [blame] | 269 | asoc->peer.asconf_capable = 0; |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 270 | if (net->sctp.addip_noauth) |
Vlad Yasevich | 73d9c4f | 2007-10-24 17:24:26 -0400 | [diff] [blame] | 271 | asoc->peer.asconf_capable = 1; |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 272 | asoc->asconf_addr_del_pending = NULL; |
| 273 | asoc->src_out_of_asoc_ok = 0; |
Michio Honda | 6af29cc | 2011-06-16 17:14:34 +0900 | [diff] [blame] | 274 | asoc->new_transport = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | /* Create an input queue. */ |
| 277 | sctp_inq_init(&asoc->base.inqueue); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 278 | sctp_inq_set_th_handler(&asoc->base.inqueue, sctp_assoc_bh_rcv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
| 280 | /* Create an output queue. */ |
| 281 | sctp_outq_init(asoc, &asoc->outqueue); |
| 282 | |
| 283 | if (!sctp_ulpq_init(&asoc->ulpq, asoc)) |
| 284 | goto fail_init; |
| 285 | |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 286 | memset(&asoc->peer.tsn_map, 0, sizeof(struct sctp_tsnmap)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
| 288 | asoc->need_ecne = 0; |
| 289 | |
| 290 | asoc->assoc_id = 0; |
| 291 | |
| 292 | /* Assume that peer would support both address types unless we are |
| 293 | * told otherwise. |
| 294 | */ |
| 295 | asoc->peer.ipv4_address = 1; |
Wei Yongjun | a2c3958 | 2009-04-07 16:35:11 +0800 | [diff] [blame] | 296 | if (asoc->base.sk->sk_family == PF_INET6) |
| 297 | asoc->peer.ipv6_address = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | INIT_LIST_HEAD(&asoc->asocs); |
| 299 | |
| 300 | asoc->autoclose = sp->autoclose; |
| 301 | |
| 302 | asoc->default_stream = sp->default_stream; |
| 303 | asoc->default_ppid = sp->default_ppid; |
| 304 | asoc->default_flags = sp->default_flags; |
| 305 | asoc->default_context = sp->default_context; |
| 306 | asoc->default_timetolive = sp->default_timetolive; |
Ivan Skytte Jorgensen | 6ab792f | 2006-12-13 16:34:22 -0800 | [diff] [blame] | 307 | asoc->default_rcv_context = sp->default_rcv_context; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
Michele Baldessari | 196d675 | 2012-12-01 04:49:42 +0000 | [diff] [blame] | 309 | /* SCTP_GET_ASSOC_STATS COUNTERS */ |
| 310 | memset(&asoc->stats, 0, sizeof(struct sctp_priv_assoc_stats)); |
| 311 | |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 312 | /* AUTH related initializations */ |
| 313 | INIT_LIST_HEAD(&asoc->endpoint_shared_keys); |
| 314 | err = sctp_auth_asoc_copy_shkeys(ep, asoc, gfp); |
| 315 | if (err) |
| 316 | goto fail_init; |
| 317 | |
| 318 | asoc->active_key_id = ep->active_key_id; |
| 319 | asoc->asoc_shared_key = NULL; |
| 320 | |
| 321 | asoc->default_hmac_id = 0; |
| 322 | /* Save the hmacs and chunks list into this association */ |
| 323 | if (ep->auth_hmacs_list) |
| 324 | memcpy(asoc->c.auth_hmacs, ep->auth_hmacs_list, |
| 325 | ntohs(ep->auth_hmacs_list->param_hdr.length)); |
| 326 | if (ep->auth_chunk_list) |
| 327 | memcpy(asoc->c.auth_chunks, ep->auth_chunk_list, |
| 328 | ntohs(ep->auth_chunk_list->param_hdr.length)); |
| 329 | |
| 330 | /* Get the AUTH random number for this association */ |
| 331 | p = (sctp_paramhdr_t *)asoc->c.auth_random; |
| 332 | p->type = SCTP_PARAM_RANDOM; |
| 333 | p->length = htons(sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH); |
| 334 | get_random_bytes(p+1, SCTP_AUTH_RANDOM_LENGTH); |
| 335 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | return asoc; |
| 337 | |
| 338 | fail_init: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | sock_put(asoc->base.sk); |
Daniel Borkmann | 2e0c9e7 | 2013-06-14 18:24:07 +0200 | [diff] [blame] | 340 | sctp_endpoint_put(asoc->ep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | return NULL; |
| 342 | } |
| 343 | |
| 344 | /* Allocate and initialize a new association */ |
| 345 | struct sctp_association *sctp_association_new(const struct sctp_endpoint *ep, |
| 346 | const struct sock *sk, |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 347 | sctp_scope_t scope, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 348 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | { |
| 350 | struct sctp_association *asoc; |
| 351 | |
Daniel Borkmann | 939cfa7 | 2013-06-17 11:40:04 +0200 | [diff] [blame] | 352 | asoc = kzalloc(sizeof(*asoc), gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | if (!asoc) |
| 354 | goto fail; |
| 355 | |
| 356 | if (!sctp_association_init(asoc, ep, sk, scope, gfp)) |
| 357 | goto fail_init; |
| 358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | SCTP_DBG_OBJCNT_INC(assoc); |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 360 | |
| 361 | pr_debug("Created asoc %p\n", asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | return asoc; |
| 364 | |
| 365 | fail_init: |
| 366 | kfree(asoc); |
| 367 | fail: |
| 368 | return NULL; |
| 369 | } |
| 370 | |
| 371 | /* Free this association if possible. There may still be users, so |
| 372 | * the actual deallocation may be delayed. |
| 373 | */ |
| 374 | void sctp_association_free(struct sctp_association *asoc) |
| 375 | { |
| 376 | struct sock *sk = asoc->base.sk; |
| 377 | struct sctp_transport *transport; |
| 378 | struct list_head *pos, *temp; |
| 379 | int i; |
| 380 | |
Vlad Yasevich | de76e69 | 2006-10-30 18:55:11 -0800 | [diff] [blame] | 381 | /* Only real associations count against the endpoint, so |
| 382 | * don't bother for if this is a temporary association. |
| 383 | */ |
| 384 | if (!asoc->temp) { |
| 385 | list_del(&asoc->asocs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Vlad Yasevich | de76e69 | 2006-10-30 18:55:11 -0800 | [diff] [blame] | 387 | /* Decrement the backlog value for a TCP-style listening |
| 388 | * socket. |
| 389 | */ |
| 390 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) |
| 391 | sk->sk_ack_backlog--; |
| 392 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
| 394 | /* Mark as dead, so other users can know this structure is |
| 395 | * going away. |
| 396 | */ |
Daniel Borkmann | 0022d2d | 2013-04-15 03:27:18 +0000 | [diff] [blame] | 397 | asoc->base.dead = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
| 399 | /* Dispose of any data lying around in the outqueue. */ |
| 400 | sctp_outq_free(&asoc->outqueue); |
| 401 | |
| 402 | /* Dispose of any pending messages for the upper layer. */ |
| 403 | sctp_ulpq_free(&asoc->ulpq); |
| 404 | |
| 405 | /* Dispose of any pending chunks on the inqueue. */ |
| 406 | sctp_inq_free(&asoc->base.inqueue); |
| 407 | |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 408 | sctp_tsnmap_free(&asoc->peer.tsn_map); |
| 409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | /* Free ssnmap storage. */ |
| 411 | sctp_ssnmap_free(asoc->ssnmap); |
| 412 | |
| 413 | /* Clean up the bound address list. */ |
| 414 | sctp_bind_addr_free(&asoc->base.bind_addr); |
| 415 | |
| 416 | /* Do we need to go through all of our timers and |
| 417 | * delete them? To be safe we will try to delete all, but we |
| 418 | * should be able to go through and make a guess based |
| 419 | * on our state. |
| 420 | */ |
| 421 | for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) { |
Ying Xue | 25cc4ae | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 422 | if (del_timer(&asoc->timers[i])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | sctp_association_put(asoc); |
| 424 | } |
| 425 | |
| 426 | /* Free peer's cached cookie. */ |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 427 | kfree(asoc->peer.cookie); |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 428 | kfree(asoc->peer.peer_random); |
| 429 | kfree(asoc->peer.peer_chunks); |
| 430 | kfree(asoc->peer.peer_hmacs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
| 432 | /* Release the transport structures. */ |
| 433 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 434 | transport = list_entry(pos, struct sctp_transport, transports); |
Thomas Graf | 45122ca26 | 2012-12-06 09:25:05 +0000 | [diff] [blame] | 435 | list_del_rcu(pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | sctp_transport_free(transport); |
| 437 | } |
| 438 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 439 | asoc->peer.transport_count = 0; |
| 440 | |
Wei Yongjun | a000c01 | 2011-05-29 23:23:36 +0000 | [diff] [blame] | 441 | sctp_asconf_queue_teardown(asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 443 | /* Free pending address space being deleted */ |
| 444 | if (asoc->asconf_addr_del_pending != NULL) |
| 445 | kfree(asoc->asconf_addr_del_pending); |
| 446 | |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 447 | /* AUTH - Free the endpoint shared keys */ |
| 448 | sctp_auth_destroy_keys(&asoc->endpoint_shared_keys); |
| 449 | |
| 450 | /* AUTH - Free the association shared key */ |
| 451 | sctp_auth_key_put(asoc->asoc_shared_key); |
| 452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | sctp_association_put(asoc); |
| 454 | } |
| 455 | |
| 456 | /* Cleanup and free up an association. */ |
| 457 | static void sctp_association_destroy(struct sctp_association *asoc) |
| 458 | { |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 459 | if (unlikely(!asoc->base.dead)) { |
| 460 | WARN(1, "Attempt to destroy undead association %p!\n", asoc); |
| 461 | return; |
| 462 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | sctp_endpoint_put(asoc->ep); |
| 465 | sock_put(asoc->base.sk); |
| 466 | |
| 467 | if (asoc->assoc_id != 0) { |
| 468 | spin_lock_bh(&sctp_assocs_id_lock); |
| 469 | idr_remove(&sctp_assocs_id, asoc->assoc_id); |
| 470 | spin_unlock_bh(&sctp_assocs_id_lock); |
| 471 | } |
| 472 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 473 | WARN_ON(atomic_read(&asoc->rmem_alloc)); |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 474 | |
Daniel Borkmann | ff2266c | 2013-04-15 03:27:17 +0000 | [diff] [blame] | 475 | kfree(asoc); |
| 476 | SCTP_DBG_OBJCNT_DEC(assoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | } |
| 478 | |
| 479 | /* Change the primary destination address for the peer. */ |
| 480 | void sctp_assoc_set_primary(struct sctp_association *asoc, |
| 481 | struct sctp_transport *transport) |
| 482 | { |
Vlad Yasevich | 319fa2a | 2008-06-16 17:00:29 -0700 | [diff] [blame] | 483 | int changeover = 0; |
| 484 | |
| 485 | /* it's a changeover only if we already have a primary path |
| 486 | * that we are changing |
| 487 | */ |
| 488 | if (asoc->peer.primary_path != NULL && |
| 489 | asoc->peer.primary_path != transport) |
| 490 | changeover = 1 ; |
| 491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | asoc->peer.primary_path = transport; |
| 493 | |
| 494 | /* Set a default msg_name for events. */ |
| 495 | memcpy(&asoc->peer.primary_addr, &transport->ipaddr, |
| 496 | sizeof(union sctp_addr)); |
| 497 | |
| 498 | /* If the primary path is changing, assume that the |
| 499 | * user wants to use this new path. |
| 500 | */ |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 501 | if ((transport->state == SCTP_ACTIVE) || |
| 502 | (transport->state == SCTP_UNKNOWN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | asoc->peer.active_path = transport; |
| 504 | |
| 505 | /* |
| 506 | * SFR-CACC algorithm: |
| 507 | * Upon the receipt of a request to change the primary |
| 508 | * destination address, on the data structure for the new |
| 509 | * primary destination, the sender MUST do the following: |
| 510 | * |
| 511 | * 1) If CHANGEOVER_ACTIVE is set, then there was a switch |
| 512 | * to this destination address earlier. The sender MUST set |
| 513 | * CYCLING_CHANGEOVER to indicate that this switch is a |
| 514 | * double switch to the same destination address. |
Vlad Yasevich | e0e9db1 | 2009-11-23 15:53:57 -0500 | [diff] [blame] | 515 | * |
| 516 | * Really, only bother is we have data queued or outstanding on |
| 517 | * the association. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | */ |
Vlad Yasevich | e0e9db1 | 2009-11-23 15:53:57 -0500 | [diff] [blame] | 519 | if (!asoc->outqueue.outstanding_bytes && !asoc->outqueue.out_qlen) |
| 520 | return; |
| 521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | if (transport->cacc.changeover_active) |
Vlad Yasevich | 319fa2a | 2008-06-16 17:00:29 -0700 | [diff] [blame] | 523 | transport->cacc.cycling_changeover = changeover; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
| 525 | /* 2) The sender MUST set CHANGEOVER_ACTIVE to indicate that |
| 526 | * a changeover has occurred. |
| 527 | */ |
Vlad Yasevich | 319fa2a | 2008-06-16 17:00:29 -0700 | [diff] [blame] | 528 | transport->cacc.changeover_active = changeover; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
| 530 | /* 3) The sender MUST store the next TSN to be sent in |
| 531 | * next_tsn_at_change. |
| 532 | */ |
| 533 | transport->cacc.next_tsn_at_change = asoc->next_tsn; |
| 534 | } |
| 535 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 536 | /* Remove a transport from an association. */ |
| 537 | void sctp_assoc_rm_peer(struct sctp_association *asoc, |
| 538 | struct sctp_transport *peer) |
| 539 | { |
| 540 | struct list_head *pos; |
| 541 | struct sctp_transport *transport; |
| 542 | |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 543 | pr_debug("%s: association:%p addr:%pISpc\n", |
| 544 | __func__, asoc, &peer->ipaddr.sa); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 545 | |
| 546 | /* If we are to remove the current retran_path, update it |
| 547 | * to the next peer before removing this peer from the list. |
| 548 | */ |
| 549 | if (asoc->peer.retran_path == peer) |
| 550 | sctp_assoc_update_retran_path(asoc); |
| 551 | |
| 552 | /* Remove this peer from the list. */ |
Thomas Graf | 45122ca26 | 2012-12-06 09:25:05 +0000 | [diff] [blame] | 553 | list_del_rcu(&peer->transports); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 554 | |
| 555 | /* Get the first transport of asoc. */ |
| 556 | pos = asoc->peer.transport_addr_list.next; |
| 557 | transport = list_entry(pos, struct sctp_transport, transports); |
| 558 | |
| 559 | /* Update any entries that match the peer to be deleted. */ |
| 560 | if (asoc->peer.primary_path == peer) |
| 561 | sctp_assoc_set_primary(asoc, transport); |
| 562 | if (asoc->peer.active_path == peer) |
| 563 | asoc->peer.active_path = transport; |
Wei Yongjun | 9494c7c | 2011-04-12 15:22:22 +0000 | [diff] [blame] | 564 | if (asoc->peer.retran_path == peer) |
| 565 | asoc->peer.retran_path = transport; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 566 | if (asoc->peer.last_data_from == peer) |
| 567 | asoc->peer.last_data_from = transport; |
| 568 | |
| 569 | /* If we remove the transport an INIT was last sent to, set it to |
| 570 | * NULL. Combined with the update of the retran path above, this |
| 571 | * will cause the next INIT to be sent to the next available |
| 572 | * transport, maintaining the cycle. |
| 573 | */ |
| 574 | if (asoc->init_last_sent_to == peer) |
| 575 | asoc->init_last_sent_to = NULL; |
| 576 | |
Wei Yongjun | 6345b19 | 2009-04-26 23:13:35 +0800 | [diff] [blame] | 577 | /* If we remove the transport an SHUTDOWN was last sent to, set it |
| 578 | * to NULL. Combined with the update of the retran path above, this |
| 579 | * will cause the next SHUTDOWN to be sent to the next available |
| 580 | * transport, maintaining the cycle. |
| 581 | */ |
| 582 | if (asoc->shutdown_last_sent_to == peer) |
| 583 | asoc->shutdown_last_sent_to = NULL; |
| 584 | |
Wei Yongjun | 10a43ce | 2009-04-26 23:14:42 +0800 | [diff] [blame] | 585 | /* If we remove the transport an ASCONF was last sent to, set it to |
| 586 | * NULL. |
| 587 | */ |
| 588 | if (asoc->addip_last_asconf && |
| 589 | asoc->addip_last_asconf->transport == peer) |
| 590 | asoc->addip_last_asconf->transport = NULL; |
| 591 | |
Vlad Yasevich | 31b02e1 | 2009-09-04 18:21:00 -0400 | [diff] [blame] | 592 | /* If we have something on the transmitted list, we have to |
| 593 | * save it off. The best place is the active path. |
| 594 | */ |
| 595 | if (!list_empty(&peer->transmitted)) { |
| 596 | struct sctp_transport *active = asoc->peer.active_path; |
| 597 | struct sctp_chunk *ch; |
| 598 | |
| 599 | /* Reset the transport of each chunk on this list */ |
| 600 | list_for_each_entry(ch, &peer->transmitted, |
| 601 | transmitted_list) { |
| 602 | ch->transport = NULL; |
| 603 | ch->rtt_in_progress = 0; |
| 604 | } |
| 605 | |
| 606 | list_splice_tail_init(&peer->transmitted, |
| 607 | &active->transmitted); |
| 608 | |
| 609 | /* Start a T3 timer here in case it wasn't running so |
| 610 | * that these migrated packets have a chance to get |
| 611 | * retrnasmitted. |
| 612 | */ |
| 613 | if (!timer_pending(&active->T3_rtx_timer)) |
| 614 | if (!mod_timer(&active->T3_rtx_timer, |
| 615 | jiffies + active->rto)) |
| 616 | sctp_transport_hold(active); |
| 617 | } |
| 618 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 619 | asoc->peer.transport_count--; |
| 620 | |
| 621 | sctp_transport_free(peer); |
| 622 | } |
| 623 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | /* Add a transport address to an association. */ |
| 625 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, |
| 626 | const union sctp_addr *addr, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 627 | const gfp_t gfp, |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 628 | const int peer_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | { |
Eric W. Biederman | 89bf345 | 2012-08-07 07:26:14 +0000 | [diff] [blame] | 630 | struct net *net = sock_net(asoc->base.sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | struct sctp_transport *peer; |
| 632 | struct sctp_sock *sp; |
| 633 | unsigned short port; |
| 634 | |
| 635 | sp = sctp_sk(asoc->base.sk); |
| 636 | |
| 637 | /* AF_INET and AF_INET6 share common port field. */ |
Al Viro | 4bdf4b5 | 2006-11-20 17:10:20 -0800 | [diff] [blame] | 638 | port = ntohs(addr->v4.sin_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 640 | pr_debug("%s: association:%p addr:%pISpc state:%d\n", __func__, |
| 641 | asoc, &addr->sa, peer_state); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | /* Set the port if it has not been set yet. */ |
| 644 | if (0 == asoc->peer.port) |
| 645 | asoc->peer.port = port; |
| 646 | |
| 647 | /* Check to see if this is a duplicate. */ |
| 648 | peer = sctp_assoc_lookup_paddr(asoc, addr); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 649 | if (peer) { |
Vlad Yasevich | add5237 | 2008-09-18 16:28:27 -0700 | [diff] [blame] | 650 | /* An UNKNOWN state is only set on transports added by |
| 651 | * user in sctp_connectx() call. Such transports should be |
| 652 | * considered CONFIRMED per RFC 4960, Section 5.4. |
| 653 | */ |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 654 | if (peer->state == SCTP_UNKNOWN) { |
Vlad Yasevich | add5237 | 2008-09-18 16:28:27 -0700 | [diff] [blame] | 655 | peer->state = SCTP_ACTIVE; |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 656 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | return peer; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 658 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
Eric W. Biederman | 89bf345 | 2012-08-07 07:26:14 +0000 | [diff] [blame] | 660 | peer = sctp_transport_new(net, addr, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | if (!peer) |
| 662 | return NULL; |
| 663 | |
| 664 | sctp_transport_set_owner(peer, asoc); |
| 665 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 666 | /* Initialize the peer's heartbeat interval based on the |
| 667 | * association configured value. |
| 668 | */ |
| 669 | peer->hbinterval = asoc->hbinterval; |
| 670 | |
| 671 | /* Set the path max_retrans. */ |
| 672 | peer->pathmaxrxt = asoc->pathmaxrxt; |
| 673 | |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 674 | /* And the partial failure retrnas threshold */ |
| 675 | peer->pf_retrans = asoc->pf_retrans; |
| 676 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 677 | /* Initialize the peer's SACK delay timeout based on the |
| 678 | * association configured value. |
| 679 | */ |
| 680 | peer->sackdelay = asoc->sackdelay; |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 681 | peer->sackfreq = asoc->sackfreq; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 682 | |
| 683 | /* Enable/disable heartbeat, SACK delay, and path MTU discovery |
| 684 | * based on association setting. |
| 685 | */ |
| 686 | peer->param_flags = asoc->param_flags; |
| 687 | |
Vlad Yasevich | 8da645e | 2009-09-04 18:21:01 -0400 | [diff] [blame] | 688 | sctp_transport_route(peer, NULL, sp); |
| 689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | /* Initialize the pmtu of the transport. */ |
Vlad Yasevich | 8da645e | 2009-09-04 18:21:01 -0400 | [diff] [blame] | 691 | if (peer->param_flags & SPP_PMTUD_DISABLE) { |
| 692 | if (asoc->pathmtu) |
| 693 | peer->pathmtu = asoc->pathmtu; |
| 694 | else |
| 695 | peer->pathmtu = SCTP_DEFAULT_MAXSEGMENT; |
| 696 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
| 698 | /* If this is the first transport addr on this association, |
| 699 | * initialize the association PMTU to the peer's PMTU. |
| 700 | * If not and the current association PMTU is higher than the new |
| 701 | * peer's PMTU, reset the association PMTU to the new peer's PMTU. |
| 702 | */ |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 703 | if (asoc->pathmtu) |
| 704 | asoc->pathmtu = min_t(int, peer->pathmtu, asoc->pathmtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | else |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 706 | asoc->pathmtu = peer->pathmtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 708 | pr_debug("%s: association:%p PMTU set to %d\n", __func__, asoc, |
| 709 | asoc->pathmtu); |
| 710 | |
Florian Westphal | 6d0ccba | 2008-07-18 23:04:39 -0700 | [diff] [blame] | 711 | peer->pmtu_pending = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
Vlad Yasevich | f68b2e0 | 2009-09-04 18:21:00 -0400 | [diff] [blame] | 713 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
| 715 | /* The asoc->peer.port might not be meaningful yet, but |
| 716 | * initialize the packet structure anyway. |
| 717 | */ |
| 718 | sctp_packet_init(&peer->packet, peer, asoc->base.bind_addr.port, |
| 719 | asoc->peer.port); |
| 720 | |
| 721 | /* 7.2.1 Slow-Start |
| 722 | * |
| 723 | * o The initial cwnd before DATA transmission or after a sufficiently |
| 724 | * long idle period MUST be set to |
| 725 | * min(4*MTU, max(2*MTU, 4380 bytes)) |
| 726 | * |
| 727 | * o The initial value of ssthresh MAY be arbitrarily high |
| 728 | * (for example, implementations MAY use the size of the |
| 729 | * receiver advertised window). |
| 730 | */ |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 731 | peer->cwnd = min(4*asoc->pathmtu, max_t(__u32, 2*asoc->pathmtu, 4380)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
| 733 | /* At this point, we may not have the receiver's advertised window, |
| 734 | * so initialize ssthresh to the default value and it will be set |
| 735 | * later when we process the INIT. |
| 736 | */ |
| 737 | peer->ssthresh = SCTP_DEFAULT_MAXWINDOW; |
| 738 | |
| 739 | peer->partial_bytes_acked = 0; |
| 740 | peer->flight_size = 0; |
Vlad Yasevich | 46d5a80 | 2009-11-23 15:54:00 -0500 | [diff] [blame] | 741 | peer->burst_limited = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | /* Set the transport's RTO.initial value */ |
| 744 | peer->rto = asoc->rto_initial; |
Michele Baldessari | 196d675 | 2012-12-01 04:49:42 +0000 | [diff] [blame] | 745 | sctp_max_rto(asoc, peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 747 | /* Set the peer's active state. */ |
| 748 | peer->state = peer_state; |
| 749 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | /* Attach the remote transport to our asoc. */ |
Thomas Graf | 45122ca26 | 2012-12-06 09:25:05 +0000 | [diff] [blame] | 751 | list_add_tail_rcu(&peer->transports, &asoc->peer.transport_addr_list); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 752 | asoc->peer.transport_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
| 754 | /* If we do not yet have a primary path, set one. */ |
| 755 | if (!asoc->peer.primary_path) { |
| 756 | sctp_assoc_set_primary(asoc, peer); |
| 757 | asoc->peer.retran_path = peer; |
| 758 | } |
| 759 | |
Vlad Yasevich | fbdf501 | 2010-04-30 22:39:26 -0400 | [diff] [blame] | 760 | if (asoc->peer.active_path == asoc->peer.retran_path && |
| 761 | peer->state != SCTP_UNCONFIRMED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | asoc->peer.retran_path = peer; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 763 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
| 765 | return peer; |
| 766 | } |
| 767 | |
| 768 | /* Delete a transport address from an association. */ |
| 769 | void sctp_assoc_del_peer(struct sctp_association *asoc, |
| 770 | const union sctp_addr *addr) |
| 771 | { |
| 772 | struct list_head *pos; |
| 773 | struct list_head *temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | struct sctp_transport *transport; |
| 775 | |
| 776 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 777 | transport = list_entry(pos, struct sctp_transport, transports); |
| 778 | if (sctp_cmp_addr_exact(addr, &transport->ipaddr)) { |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 779 | /* Do book keeping for removing the peer and free it. */ |
| 780 | sctp_assoc_rm_peer(asoc, transport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | break; |
| 782 | } |
| 783 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | } |
| 785 | |
| 786 | /* Lookup a transport by address. */ |
| 787 | struct sctp_transport *sctp_assoc_lookup_paddr( |
| 788 | const struct sctp_association *asoc, |
| 789 | const union sctp_addr *address) |
| 790 | { |
| 791 | struct sctp_transport *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
| 793 | /* Cycle through all transports searching for a peer address. */ |
| 794 | |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 795 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
| 796 | transports) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | if (sctp_cmp_addr_exact(address, &t->ipaddr)) |
| 798 | return t; |
| 799 | } |
| 800 | |
| 801 | return NULL; |
| 802 | } |
| 803 | |
Vlad Yasevich | 42e30bf | 2007-12-20 14:08:56 -0800 | [diff] [blame] | 804 | /* Remove all transports except a give one */ |
| 805 | void sctp_assoc_del_nonprimary_peers(struct sctp_association *asoc, |
| 806 | struct sctp_transport *primary) |
| 807 | { |
| 808 | struct sctp_transport *temp; |
| 809 | struct sctp_transport *t; |
| 810 | |
| 811 | list_for_each_entry_safe(t, temp, &asoc->peer.transport_addr_list, |
| 812 | transports) { |
| 813 | /* if the current transport is not the primary one, delete it */ |
| 814 | if (t != primary) |
| 815 | sctp_assoc_rm_peer(asoc, t); |
| 816 | } |
Vlad Yasevich | 42e30bf | 2007-12-20 14:08:56 -0800 | [diff] [blame] | 817 | } |
| 818 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | /* Engage in transport control operations. |
| 820 | * Mark the transport up or down and send a notification to the user. |
| 821 | * Select and update the new active and retran paths. |
| 822 | */ |
| 823 | void sctp_assoc_control_transport(struct sctp_association *asoc, |
| 824 | struct sctp_transport *transport, |
| 825 | sctp_transport_cmd_t command, |
| 826 | sctp_sn_error_t error) |
| 827 | { |
| 828 | struct sctp_transport *t = NULL; |
| 829 | struct sctp_transport *first; |
| 830 | struct sctp_transport *second; |
| 831 | struct sctp_ulpevent *event; |
Al Viro | 0906e20 | 2006-11-20 17:03:01 -0800 | [diff] [blame] | 832 | struct sockaddr_storage addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | int spc_state = 0; |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 834 | bool ulp_notify = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
| 836 | /* Record the transition on the transport. */ |
| 837 | switch (command) { |
| 838 | case SCTP_TRANSPORT_UP: |
Vlad Yasevich | 1ae4114 | 2007-03-23 11:32:26 -0700 | [diff] [blame] | 839 | /* If we are moving from UNCONFIRMED state due |
| 840 | * to heartbeat success, report the SCTP_ADDR_CONFIRMED |
| 841 | * state to the user, otherwise report SCTP_ADDR_AVAILABLE. |
| 842 | */ |
| 843 | if (SCTP_UNCONFIRMED == transport->state && |
| 844 | SCTP_HEARTBEAT_SUCCESS == error) |
| 845 | spc_state = SCTP_ADDR_CONFIRMED; |
| 846 | else |
| 847 | spc_state = SCTP_ADDR_AVAILABLE; |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 848 | /* Don't inform ULP about transition from PF to |
Daniel Borkmann | ac4f959 | 2013-08-09 15:09:08 +0200 | [diff] [blame] | 849 | * active state and set cwnd to 1 MTU, see SCTP |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 850 | * Quick failover draft section 5.1, point 5 |
| 851 | */ |
| 852 | if (transport->state == SCTP_PF) { |
| 853 | ulp_notify = false; |
Daniel Borkmann | ac4f959 | 2013-08-09 15:09:08 +0200 | [diff] [blame] | 854 | transport->cwnd = asoc->pathmtu; |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 855 | } |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 856 | transport->state = SCTP_ACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | break; |
| 858 | |
| 859 | case SCTP_TRANSPORT_DOWN: |
Vlad Yasevich | 4018788 | 2009-06-23 11:28:05 -0400 | [diff] [blame] | 860 | /* If the transport was never confirmed, do not transition it |
| 861 | * to inactive state. Also, release the cached route since |
| 862 | * there may be a better route next time. |
Vlad Yasevich | cc75689 | 2007-08-24 19:30:25 +0900 | [diff] [blame] | 863 | */ |
| 864 | if (transport->state != SCTP_UNCONFIRMED) |
| 865 | transport->state = SCTP_INACTIVE; |
Vlad Yasevich | 4018788 | 2009-06-23 11:28:05 -0400 | [diff] [blame] | 866 | else { |
| 867 | dst_release(transport->dst); |
| 868 | transport->dst = NULL; |
| 869 | } |
Vlad Yasevich | cc75689 | 2007-08-24 19:30:25 +0900 | [diff] [blame] | 870 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | spc_state = SCTP_ADDR_UNREACHABLE; |
| 872 | break; |
| 873 | |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 874 | case SCTP_TRANSPORT_PF: |
| 875 | transport->state = SCTP_PF; |
| 876 | ulp_notify = false; |
| 877 | break; |
| 878 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | default: |
| 880 | return; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 881 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
| 883 | /* Generate and send a SCTP_PEER_ADDR_CHANGE notification to the |
| 884 | * user. |
| 885 | */ |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 886 | if (ulp_notify) { |
| 887 | memset(&addr, 0, sizeof(struct sockaddr_storage)); |
| 888 | memcpy(&addr, &transport->ipaddr, |
| 889 | transport->af_specific->sockaddr_len); |
| 890 | event = sctp_ulpevent_make_peer_addr_change(asoc, &addr, |
| 891 | 0, spc_state, error, GFP_ATOMIC); |
| 892 | if (event) |
| 893 | sctp_ulpq_tail_event(&asoc->ulpq, event); |
| 894 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
| 896 | /* Select new active and retran paths. */ |
| 897 | |
| 898 | /* Look for the two most recently used active transports. |
| 899 | * |
| 900 | * This code produces the wrong ordering whenever jiffies |
| 901 | * rolls over, but we still get usable transports, so we don't |
| 902 | * worry about it. |
| 903 | */ |
| 904 | first = NULL; second = NULL; |
| 905 | |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 906 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
| 907 | transports) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 909 | if ((t->state == SCTP_INACTIVE) || |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 910 | (t->state == SCTP_UNCONFIRMED) || |
| 911 | (t->state == SCTP_PF)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | continue; |
| 913 | if (!first || t->last_time_heard > first->last_time_heard) { |
| 914 | second = first; |
| 915 | first = t; |
| 916 | } |
| 917 | if (!second || t->last_time_heard > second->last_time_heard) |
| 918 | second = t; |
| 919 | } |
| 920 | |
| 921 | /* RFC 2960 6.4 Multi-Homed SCTP Endpoints |
| 922 | * |
| 923 | * By default, an endpoint should always transmit to the |
| 924 | * primary path, unless the SCTP user explicitly specifies the |
| 925 | * destination transport address (and possibly source |
| 926 | * transport address) to use. |
| 927 | * |
| 928 | * [If the primary is active but not most recent, bump the most |
| 929 | * recently used transport.] |
| 930 | */ |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 931 | if (((asoc->peer.primary_path->state == SCTP_ACTIVE) || |
| 932 | (asoc->peer.primary_path->state == SCTP_UNKNOWN)) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | first != asoc->peer.primary_path) { |
| 934 | second = first; |
| 935 | first = asoc->peer.primary_path; |
| 936 | } |
| 937 | |
| 938 | /* If we failed to find a usable transport, just camp on the |
| 939 | * primary, even if it is inactive. |
| 940 | */ |
| 941 | if (!first) { |
| 942 | first = asoc->peer.primary_path; |
| 943 | second = asoc->peer.primary_path; |
| 944 | } |
| 945 | |
| 946 | /* Set the active and retran transports. */ |
| 947 | asoc->peer.active_path = first; |
| 948 | asoc->peer.retran_path = second; |
| 949 | } |
| 950 | |
| 951 | /* Hold a reference to an association. */ |
| 952 | void sctp_association_hold(struct sctp_association *asoc) |
| 953 | { |
| 954 | atomic_inc(&asoc->base.refcnt); |
| 955 | } |
| 956 | |
| 957 | /* Release a reference to an association and cleanup |
| 958 | * if there are no more references. |
| 959 | */ |
| 960 | void sctp_association_put(struct sctp_association *asoc) |
| 961 | { |
| 962 | if (atomic_dec_and_test(&asoc->base.refcnt)) |
| 963 | sctp_association_destroy(asoc); |
| 964 | } |
| 965 | |
| 966 | /* Allocate the next TSN, Transmission Sequence Number, for the given |
| 967 | * association. |
| 968 | */ |
| 969 | __u32 sctp_association_get_next_tsn(struct sctp_association *asoc) |
| 970 | { |
| 971 | /* From Section 1.6 Serial Number Arithmetic: |
| 972 | * Transmission Sequence Numbers wrap around when they reach |
| 973 | * 2**32 - 1. That is, the next TSN a DATA chunk MUST use |
| 974 | * after transmitting TSN = 2*32 - 1 is TSN = 0. |
| 975 | */ |
| 976 | __u32 retval = asoc->next_tsn; |
| 977 | asoc->next_tsn++; |
| 978 | asoc->unack_data++; |
| 979 | |
| 980 | return retval; |
| 981 | } |
| 982 | |
| 983 | /* Compare two addresses to see if they match. Wildcard addresses |
| 984 | * only match themselves. |
| 985 | */ |
| 986 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, |
| 987 | const union sctp_addr *ss2) |
| 988 | { |
| 989 | struct sctp_af *af; |
| 990 | |
| 991 | af = sctp_get_af_specific(ss1->sa.sa_family); |
| 992 | if (unlikely(!af)) |
| 993 | return 0; |
| 994 | |
| 995 | return af->cmp_addr(ss1, ss2); |
| 996 | } |
| 997 | |
| 998 | /* Return an ecne chunk to get prepended to a packet. |
| 999 | * Note: We are sly and return a shared, prealloced chunk. FIXME: |
| 1000 | * No we don't, but we could/should. |
| 1001 | */ |
| 1002 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc) |
| 1003 | { |
| 1004 | struct sctp_chunk *chunk; |
| 1005 | |
| 1006 | /* Send ECNE if needed. |
| 1007 | * Not being able to allocate a chunk here is not deadly. |
| 1008 | */ |
| 1009 | if (asoc->need_ecne) |
| 1010 | chunk = sctp_make_ecne(asoc, asoc->last_ecne_tsn); |
| 1011 | else |
| 1012 | chunk = NULL; |
| 1013 | |
| 1014 | return chunk; |
| 1015 | } |
| 1016 | |
| 1017 | /* |
| 1018 | * Find which transport this TSN was sent on. |
| 1019 | */ |
| 1020 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *asoc, |
| 1021 | __u32 tsn) |
| 1022 | { |
| 1023 | struct sctp_transport *active; |
| 1024 | struct sctp_transport *match; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | struct sctp_transport *transport; |
| 1026 | struct sctp_chunk *chunk; |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 1027 | __be32 key = htonl(tsn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | |
| 1029 | match = NULL; |
| 1030 | |
| 1031 | /* |
| 1032 | * FIXME: In general, find a more efficient data structure for |
| 1033 | * searching. |
| 1034 | */ |
| 1035 | |
| 1036 | /* |
| 1037 | * The general strategy is to search each transport's transmitted |
| 1038 | * list. Return which transport this TSN lives on. |
| 1039 | * |
| 1040 | * Let's be hopeful and check the active_path first. |
| 1041 | * Another optimization would be to know if there is only one |
| 1042 | * outbound path and not have to look for the TSN at all. |
| 1043 | * |
| 1044 | */ |
| 1045 | |
| 1046 | active = asoc->peer.active_path; |
| 1047 | |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 1048 | list_for_each_entry(chunk, &active->transmitted, |
| 1049 | transmitted_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | |
| 1051 | if (key == chunk->subh.data_hdr->tsn) { |
| 1052 | match = active; |
| 1053 | goto out; |
| 1054 | } |
| 1055 | } |
| 1056 | |
| 1057 | /* If not found, go search all the other transports. */ |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 1058 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
| 1059 | transports) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | |
| 1061 | if (transport == active) |
Xufeng Zhang | 2317f44 | 2013-03-07 21:39:37 +0000 | [diff] [blame] | 1062 | continue; |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 1063 | list_for_each_entry(chunk, &transport->transmitted, |
| 1064 | transmitted_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | if (key == chunk->subh.data_hdr->tsn) { |
| 1066 | match = transport; |
| 1067 | goto out; |
| 1068 | } |
| 1069 | } |
| 1070 | } |
| 1071 | out: |
| 1072 | return match; |
| 1073 | } |
| 1074 | |
| 1075 | /* Is this the association we are looking for? */ |
| 1076 | struct sctp_transport *sctp_assoc_is_match(struct sctp_association *asoc, |
Eric W. Biederman | 4110cc2 | 2012-08-06 08:41:13 +0000 | [diff] [blame] | 1077 | struct net *net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | const union sctp_addr *laddr, |
| 1079 | const union sctp_addr *paddr) |
| 1080 | { |
| 1081 | struct sctp_transport *transport; |
| 1082 | |
Al Viro | e2fcced | 2006-11-20 17:08:41 -0800 | [diff] [blame] | 1083 | if ((htons(asoc->base.bind_addr.port) == laddr->v4.sin_port) && |
Eric W. Biederman | 4110cc2 | 2012-08-06 08:41:13 +0000 | [diff] [blame] | 1084 | (htons(asoc->peer.port) == paddr->v4.sin_port) && |
| 1085 | net_eq(sock_net(asoc->base.sk), net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | transport = sctp_assoc_lookup_paddr(asoc, paddr); |
| 1087 | if (!transport) |
| 1088 | goto out; |
| 1089 | |
| 1090 | if (sctp_bind_addr_match(&asoc->base.bind_addr, laddr, |
| 1091 | sctp_sk(asoc->base.sk))) |
| 1092 | goto out; |
| 1093 | } |
| 1094 | transport = NULL; |
| 1095 | |
| 1096 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | return transport; |
| 1098 | } |
| 1099 | |
| 1100 | /* Do delayed input processing. This is scheduled by sctp_rcv(). */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1101 | static void sctp_assoc_bh_rcv(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1103 | struct sctp_association *asoc = |
| 1104 | container_of(work, struct sctp_association, |
| 1105 | base.inqueue.immediate); |
Eric W. Biederman | 55e26eb | 2012-08-07 07:25:24 +0000 | [diff] [blame] | 1106 | struct net *net = sock_net(asoc->base.sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | struct sctp_endpoint *ep; |
| 1108 | struct sctp_chunk *chunk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | struct sctp_inq *inqueue; |
| 1110 | int state; |
| 1111 | sctp_subtype_t subtype; |
| 1112 | int error = 0; |
| 1113 | |
| 1114 | /* The association should be held so we should be safe. */ |
| 1115 | ep = asoc->ep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | |
| 1117 | inqueue = &asoc->base.inqueue; |
| 1118 | sctp_association_hold(asoc); |
| 1119 | while (NULL != (chunk = sctp_inq_pop(inqueue))) { |
| 1120 | state = asoc->state; |
| 1121 | subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type); |
| 1122 | |
Vlad Yasevich | bbd0d59 | 2007-10-03 17:51:34 -0700 | [diff] [blame] | 1123 | /* SCTP-AUTH, Section 6.3: |
| 1124 | * The receiver has a list of chunk types which it expects |
| 1125 | * to be received only after an AUTH-chunk. This list has |
| 1126 | * been sent to the peer during the association setup. It |
| 1127 | * MUST silently discard these chunks if they are not placed |
| 1128 | * after an AUTH chunk in the packet. |
| 1129 | */ |
| 1130 | if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth) |
| 1131 | continue; |
| 1132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | /* Remember where the last DATA chunk came from so we |
| 1134 | * know where to send the SACK. |
| 1135 | */ |
| 1136 | if (sctp_chunk_is_data(chunk)) |
| 1137 | asoc->peer.last_data_from = chunk->transport; |
Michele Baldessari | 196d675 | 2012-12-01 04:49:42 +0000 | [diff] [blame] | 1138 | else { |
Eric W. Biederman | 55e26eb | 2012-08-07 07:25:24 +0000 | [diff] [blame] | 1139 | SCTP_INC_STATS(net, SCTP_MIB_INCTRLCHUNKS); |
Michele Baldessari | 196d675 | 2012-12-01 04:49:42 +0000 | [diff] [blame] | 1140 | asoc->stats.ictrlchunks++; |
| 1141 | if (chunk->chunk_hdr->type == SCTP_CID_SACK) |
| 1142 | asoc->stats.isacks++; |
| 1143 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
| 1145 | if (chunk->transport) |
| 1146 | chunk->transport->last_time_heard = jiffies; |
| 1147 | |
| 1148 | /* Run through the state machine. */ |
Eric W. Biederman | 55e26eb | 2012-08-07 07:25:24 +0000 | [diff] [blame] | 1149 | error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | state, ep, asoc, chunk, GFP_ATOMIC); |
| 1151 | |
| 1152 | /* Check to see if the association is freed in response to |
| 1153 | * the incoming chunk. If so, get out of the while loop. |
| 1154 | */ |
| 1155 | if (asoc->base.dead) |
| 1156 | break; |
| 1157 | |
| 1158 | /* If there is an error on chunk, discard this packet. */ |
| 1159 | if (error && chunk) |
| 1160 | chunk->pdiscard = 1; |
| 1161 | } |
| 1162 | sctp_association_put(asoc); |
| 1163 | } |
| 1164 | |
| 1165 | /* This routine moves an association from its old sk to a new sk. */ |
| 1166 | void sctp_assoc_migrate(struct sctp_association *assoc, struct sock *newsk) |
| 1167 | { |
| 1168 | struct sctp_sock *newsp = sctp_sk(newsk); |
| 1169 | struct sock *oldsk = assoc->base.sk; |
| 1170 | |
| 1171 | /* Delete the association from the old endpoint's list of |
| 1172 | * associations. |
| 1173 | */ |
| 1174 | list_del_init(&assoc->asocs); |
| 1175 | |
| 1176 | /* Decrement the backlog value for a TCP-style socket. */ |
| 1177 | if (sctp_style(oldsk, TCP)) |
| 1178 | oldsk->sk_ack_backlog--; |
| 1179 | |
| 1180 | /* Release references to the old endpoint and the sock. */ |
| 1181 | sctp_endpoint_put(assoc->ep); |
| 1182 | sock_put(assoc->base.sk); |
| 1183 | |
| 1184 | /* Get a reference to the new endpoint. */ |
| 1185 | assoc->ep = newsp->ep; |
| 1186 | sctp_endpoint_hold(assoc->ep); |
| 1187 | |
| 1188 | /* Get a reference to the new sock. */ |
| 1189 | assoc->base.sk = newsk; |
| 1190 | sock_hold(assoc->base.sk); |
| 1191 | |
| 1192 | /* Add the association to the new endpoint's list of associations. */ |
| 1193 | sctp_endpoint_add_asoc(newsp->ep, assoc); |
| 1194 | } |
| 1195 | |
| 1196 | /* Update an association (possibly from unexpected COOKIE-ECHO processing). */ |
| 1197 | void sctp_assoc_update(struct sctp_association *asoc, |
| 1198 | struct sctp_association *new) |
| 1199 | { |
| 1200 | struct sctp_transport *trans; |
| 1201 | struct list_head *pos, *temp; |
| 1202 | |
| 1203 | /* Copy in new parameters of peer. */ |
| 1204 | asoc->c = new->c; |
| 1205 | asoc->peer.rwnd = new->peer.rwnd; |
| 1206 | asoc->peer.sack_needed = new->peer.sack_needed; |
| 1207 | asoc->peer.i = new->peer.i; |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 1208 | sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
| 1209 | asoc->peer.i.initial_tsn, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | |
| 1211 | /* Remove any peer addresses not present in the new association. */ |
| 1212 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 1213 | trans = list_entry(pos, struct sctp_transport, transports); |
Vlad Yasevich | 0c42749 | 2010-04-28 08:47:19 +0000 | [diff] [blame] | 1214 | if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr)) { |
| 1215 | sctp_assoc_rm_peer(asoc, trans); |
| 1216 | continue; |
| 1217 | } |
Vlad Yasevich | 749bf92 | 2007-03-19 17:02:30 -0700 | [diff] [blame] | 1218 | |
| 1219 | if (asoc->state >= SCTP_STATE_ESTABLISHED) |
| 1220 | sctp_transport_reset(trans); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | } |
| 1222 | |
| 1223 | /* If the case is A (association restart), use |
| 1224 | * initial_tsn as next_tsn. If the case is B, use |
| 1225 | * current next_tsn in case data sent to peer |
| 1226 | * has been discarded and needs retransmission. |
| 1227 | */ |
| 1228 | if (asoc->state >= SCTP_STATE_ESTABLISHED) { |
| 1229 | asoc->next_tsn = new->next_tsn; |
| 1230 | asoc->ctsn_ack_point = new->ctsn_ack_point; |
| 1231 | asoc->adv_peer_ack_point = new->adv_peer_ack_point; |
| 1232 | |
| 1233 | /* Reinitialize SSN for both local streams |
| 1234 | * and peer's streams. |
| 1235 | */ |
| 1236 | sctp_ssnmap_clear(asoc->ssnmap); |
| 1237 | |
Vlad Yasevich | 0b58a81 | 2007-03-19 17:01:17 -0700 | [diff] [blame] | 1238 | /* Flush the ULP reassembly and ordered queue. |
| 1239 | * Any data there will now be stale and will |
| 1240 | * cause problems. |
| 1241 | */ |
| 1242 | sctp_ulpq_flush(&asoc->ulpq); |
| 1243 | |
Vlad Yasevich | 749bf92 | 2007-03-19 17:02:30 -0700 | [diff] [blame] | 1244 | /* reset the overall association error count so |
| 1245 | * that the restarted association doesn't get torn |
| 1246 | * down on the next retransmission timer. |
| 1247 | */ |
| 1248 | asoc->overall_error_count = 0; |
| 1249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | } else { |
| 1251 | /* Add any peer addresses from the new association. */ |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 1252 | list_for_each_entry(trans, &new->peer.transport_addr_list, |
| 1253 | transports) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr)) |
| 1255 | sctp_assoc_add_peer(asoc, &trans->ipaddr, |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 1256 | GFP_ATOMIC, trans->state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | } |
| 1258 | |
| 1259 | asoc->ctsn_ack_point = asoc->next_tsn - 1; |
| 1260 | asoc->adv_peer_ack_point = asoc->ctsn_ack_point; |
| 1261 | if (!asoc->ssnmap) { |
| 1262 | /* Move the ssnmap. */ |
| 1263 | asoc->ssnmap = new->ssnmap; |
| 1264 | new->ssnmap = NULL; |
| 1265 | } |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1266 | |
| 1267 | if (!asoc->assoc_id) { |
| 1268 | /* get a new association id since we don't have one |
| 1269 | * yet. |
| 1270 | */ |
| 1271 | sctp_assoc_set_id(asoc, GFP_ATOMIC); |
| 1272 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | } |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 1274 | |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 1275 | /* SCTP-AUTH: Save the peer parameters from the new assocaitions |
| 1276 | * and also move the association shared keys over |
| 1277 | */ |
| 1278 | kfree(asoc->peer.peer_random); |
| 1279 | asoc->peer.peer_random = new->peer.peer_random; |
| 1280 | new->peer.peer_random = NULL; |
| 1281 | |
| 1282 | kfree(asoc->peer.peer_chunks); |
| 1283 | asoc->peer.peer_chunks = new->peer.peer_chunks; |
| 1284 | new->peer.peer_chunks = NULL; |
| 1285 | |
| 1286 | kfree(asoc->peer.peer_hmacs); |
| 1287 | asoc->peer.peer_hmacs = new->peer.peer_hmacs; |
| 1288 | new->peer.peer_hmacs = NULL; |
| 1289 | |
| 1290 | sctp_auth_key_put(asoc->asoc_shared_key); |
| 1291 | sctp_auth_asoc_init_active_key(asoc, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | } |
| 1293 | |
| 1294 | /* Update the retran path for sending a retransmitted packet. |
| 1295 | * Round-robin through the active transports, else round-robin |
| 1296 | * through the inactive transports as this is the next best thing |
| 1297 | * we can try. |
| 1298 | */ |
| 1299 | void sctp_assoc_update_retran_path(struct sctp_association *asoc) |
| 1300 | { |
| 1301 | struct sctp_transport *t, *next; |
| 1302 | struct list_head *head = &asoc->peer.transport_addr_list; |
| 1303 | struct list_head *pos; |
| 1304 | |
Gui Jianfeng | 4141ddc | 2008-06-04 12:37:33 -0700 | [diff] [blame] | 1305 | if (asoc->peer.transport_count == 1) |
| 1306 | return; |
| 1307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | /* Find the next transport in a round-robin fashion. */ |
| 1309 | t = asoc->peer.retran_path; |
| 1310 | pos = &t->transports; |
| 1311 | next = NULL; |
| 1312 | |
| 1313 | while (1) { |
| 1314 | /* Skip the head. */ |
| 1315 | if (pos->next == head) |
| 1316 | pos = head->next; |
| 1317 | else |
| 1318 | pos = pos->next; |
| 1319 | |
| 1320 | t = list_entry(pos, struct sctp_transport, transports); |
| 1321 | |
Gui Jianfeng | 4141ddc | 2008-06-04 12:37:33 -0700 | [diff] [blame] | 1322 | /* We have exhausted the list, but didn't find any |
| 1323 | * other active transports. If so, use the next |
| 1324 | * transport. |
| 1325 | */ |
| 1326 | if (t == asoc->peer.retran_path) { |
| 1327 | t = next; |
| 1328 | break; |
| 1329 | } |
| 1330 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | /* Try to find an active transport. */ |
| 1332 | |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 1333 | if ((t->state == SCTP_ACTIVE) || |
| 1334 | (t->state == SCTP_UNKNOWN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | break; |
| 1336 | } else { |
| 1337 | /* Keep track of the next transport in case |
| 1338 | * we don't find any active transport. |
| 1339 | */ |
Vlad Yasevich | fbdf501 | 2010-04-30 22:39:26 -0400 | [diff] [blame] | 1340 | if (t->state != SCTP_UNCONFIRMED && !next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | next = t; |
| 1342 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | } |
| 1344 | |
Vlad Yasevich | d598b16 | 2010-04-30 22:41:09 -0400 | [diff] [blame] | 1345 | if (t) |
| 1346 | asoc->peer.retran_path = t; |
Vlad Yasevich | 25f7bf7 | 2011-04-12 15:20:48 +0000 | [diff] [blame] | 1347 | else |
| 1348 | t = asoc->peer.retran_path; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1349 | |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 1350 | pr_debug("%s: association:%p addr:%pISpc\n", __func__, asoc, |
| 1351 | &t->ipaddr.sa); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1352 | } |
| 1353 | |
Wei Yongjun | 9919b45 | 2009-05-12 21:52:51 +0800 | [diff] [blame] | 1354 | /* Choose the transport for sending retransmit packet. */ |
| 1355 | struct sctp_transport *sctp_assoc_choose_alter_transport( |
| 1356 | struct sctp_association *asoc, struct sctp_transport *last_sent_to) |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1357 | { |
Wei Yongjun | 9919b45 | 2009-05-12 21:52:51 +0800 | [diff] [blame] | 1358 | /* If this is the first time packet is sent, use the active path, |
| 1359 | * else use the retran path. If the last packet was sent over the |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1360 | * retran path, update the retran path and use it. |
| 1361 | */ |
Wei Yongjun | 9919b45 | 2009-05-12 21:52:51 +0800 | [diff] [blame] | 1362 | if (!last_sent_to) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | return asoc->peer.active_path; |
| 1364 | else { |
Wei Yongjun | 9919b45 | 2009-05-12 21:52:51 +0800 | [diff] [blame] | 1365 | if (last_sent_to == asoc->peer.retran_path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | sctp_assoc_update_retran_path(asoc); |
| 1367 | return asoc->peer.retran_path; |
| 1368 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | } |
| 1370 | |
| 1371 | /* Update the association's pmtu and frag_point by going through all the |
| 1372 | * transports. This routine is called when a transport's PMTU has changed. |
| 1373 | */ |
David S. Miller | 02f3d4c | 2012-07-16 03:57:14 -0700 | [diff] [blame] | 1374 | void sctp_assoc_sync_pmtu(struct sock *sk, struct sctp_association *asoc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | { |
| 1376 | struct sctp_transport *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | __u32 pmtu = 0; |
| 1378 | |
| 1379 | if (!asoc) |
| 1380 | return; |
| 1381 | |
| 1382 | /* Get the lowest pmtu of all the transports. */ |
Robert P. J. Day | 9dbc15f | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 1383 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
| 1384 | transports) { |
Vlad Yasevich | 8a47949 | 2007-06-07 14:21:05 -0400 | [diff] [blame] | 1385 | if (t->pmtu_pending && t->dst) { |
David S. Miller | 02f3d4c | 2012-07-16 03:57:14 -0700 | [diff] [blame] | 1386 | sctp_transport_update_pmtu(sk, t, dst_mtu(t->dst)); |
Vlad Yasevich | 8a47949 | 2007-06-07 14:21:05 -0400 | [diff] [blame] | 1387 | t->pmtu_pending = 0; |
| 1388 | } |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1389 | if (!pmtu || (t->pathmtu < pmtu)) |
| 1390 | pmtu = t->pathmtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | } |
| 1392 | |
| 1393 | if (pmtu) { |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1394 | asoc->pathmtu = pmtu; |
Vlad Yasevich | f68b2e0 | 2009-09-04 18:21:00 -0400 | [diff] [blame] | 1395 | asoc->frag_point = sctp_frag_point(asoc, pmtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | } |
| 1397 | |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 1398 | pr_debug("%s: asoc:%p, pmtu:%d, frag_point:%d\n", __func__, asoc, |
| 1399 | asoc->pathmtu, asoc->frag_point); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | } |
| 1401 | |
| 1402 | /* Should we send a SACK to update our peer? */ |
| 1403 | static inline int sctp_peer_needs_update(struct sctp_association *asoc) |
| 1404 | { |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 1405 | struct net *net = sock_net(asoc->base.sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | switch (asoc->state) { |
| 1407 | case SCTP_STATE_ESTABLISHED: |
| 1408 | case SCTP_STATE_SHUTDOWN_PENDING: |
| 1409 | case SCTP_STATE_SHUTDOWN_RECEIVED: |
| 1410 | case SCTP_STATE_SHUTDOWN_SENT: |
| 1411 | if ((asoc->rwnd > asoc->a_rwnd) && |
Vlad Yasevich | 90f2f53 | 2009-11-23 15:53:57 -0500 | [diff] [blame] | 1412 | ((asoc->rwnd - asoc->a_rwnd) >= max_t(__u32, |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 1413 | (asoc->base.sk->sk_rcvbuf >> net->sctp.rwnd_upd_shift), |
Vlad Yasevich | 90f2f53 | 2009-11-23 15:53:57 -0500 | [diff] [blame] | 1414 | asoc->pathmtu))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | return 1; |
| 1416 | break; |
| 1417 | default: |
| 1418 | break; |
| 1419 | } |
| 1420 | return 0; |
| 1421 | } |
| 1422 | |
| 1423 | /* Increase asoc's rwnd by len and send any window update SACK if needed. */ |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1424 | void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | { |
| 1426 | struct sctp_chunk *sack; |
| 1427 | struct timer_list *timer; |
| 1428 | |
| 1429 | if (asoc->rwnd_over) { |
| 1430 | if (asoc->rwnd_over >= len) { |
| 1431 | asoc->rwnd_over -= len; |
| 1432 | } else { |
| 1433 | asoc->rwnd += (len - asoc->rwnd_over); |
| 1434 | asoc->rwnd_over = 0; |
| 1435 | } |
| 1436 | } else { |
| 1437 | asoc->rwnd += len; |
| 1438 | } |
| 1439 | |
Vlad Yasevich | 4d3c46e | 2009-09-04 18:20:59 -0400 | [diff] [blame] | 1440 | /* If we had window pressure, start recovering it |
| 1441 | * once our rwnd had reached the accumulated pressure |
| 1442 | * threshold. The idea is to recover slowly, but up |
| 1443 | * to the initial advertised window. |
| 1444 | */ |
| 1445 | if (asoc->rwnd_press && asoc->rwnd >= asoc->rwnd_press) { |
| 1446 | int change = min(asoc->pathmtu, asoc->rwnd_press); |
| 1447 | asoc->rwnd += change; |
| 1448 | asoc->rwnd_press -= change; |
| 1449 | } |
| 1450 | |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 1451 | pr_debug("%s: asoc:%p rwnd increased by %d to (%u, %u) - %u\n", |
| 1452 | __func__, asoc, len, asoc->rwnd, asoc->rwnd_over, |
| 1453 | asoc->a_rwnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | |
| 1455 | /* Send a window update SACK if the rwnd has increased by at least the |
| 1456 | * minimum of the association's PMTU and half of the receive buffer. |
| 1457 | * The algorithm used is similar to the one described in |
| 1458 | * Section 4.2.3.3 of RFC 1122. |
| 1459 | */ |
| 1460 | if (sctp_peer_needs_update(asoc)) { |
| 1461 | asoc->a_rwnd = asoc->rwnd; |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 1462 | |
| 1463 | pr_debug("%s: sending window update SACK- asoc:%p rwnd:%u " |
| 1464 | "a_rwnd:%u\n", __func__, asoc, asoc->rwnd, |
| 1465 | asoc->a_rwnd); |
| 1466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | sack = sctp_make_sack(asoc); |
| 1468 | if (!sack) |
| 1469 | return; |
| 1470 | |
| 1471 | asoc->peer.sack_needed = 0; |
| 1472 | |
| 1473 | sctp_outq_tail(&asoc->outqueue, sack); |
| 1474 | |
| 1475 | /* Stop the SACK timer. */ |
| 1476 | timer = &asoc->timers[SCTP_EVENT_TIMEOUT_SACK]; |
Ying Xue | 25cc4ae | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 1477 | if (del_timer(timer)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | sctp_association_put(asoc); |
| 1479 | } |
| 1480 | } |
| 1481 | |
| 1482 | /* Decrease asoc's rwnd by len. */ |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1483 | void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | { |
Vlad Yasevich | 4d3c46e | 2009-09-04 18:20:59 -0400 | [diff] [blame] | 1485 | int rx_count; |
| 1486 | int over = 0; |
| 1487 | |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 1488 | if (unlikely(!asoc->rwnd || asoc->rwnd_over)) |
| 1489 | pr_debug("%s: association:%p has asoc->rwnd:%u, " |
| 1490 | "asoc->rwnd_over:%u!\n", __func__, asoc, |
| 1491 | asoc->rwnd, asoc->rwnd_over); |
Vlad Yasevich | 4d3c46e | 2009-09-04 18:20:59 -0400 | [diff] [blame] | 1492 | |
| 1493 | if (asoc->ep->rcvbuf_policy) |
| 1494 | rx_count = atomic_read(&asoc->rmem_alloc); |
| 1495 | else |
| 1496 | rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc); |
| 1497 | |
| 1498 | /* If we've reached or overflowed our receive buffer, announce |
| 1499 | * a 0 rwnd if rwnd would still be positive. Store the |
| 1500 | * the pottential pressure overflow so that the window can be restored |
| 1501 | * back to original value. |
| 1502 | */ |
| 1503 | if (rx_count >= asoc->base.sk->sk_rcvbuf) |
| 1504 | over = 1; |
| 1505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | if (asoc->rwnd >= len) { |
| 1507 | asoc->rwnd -= len; |
Vlad Yasevich | 4d3c46e | 2009-09-04 18:20:59 -0400 | [diff] [blame] | 1508 | if (over) { |
Vlad Yasevich | 6588337 | 2010-04-30 22:41:10 -0400 | [diff] [blame] | 1509 | asoc->rwnd_press += asoc->rwnd; |
Vlad Yasevich | 4d3c46e | 2009-09-04 18:20:59 -0400 | [diff] [blame] | 1510 | asoc->rwnd = 0; |
| 1511 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | } else { |
| 1513 | asoc->rwnd_over = len - asoc->rwnd; |
| 1514 | asoc->rwnd = 0; |
| 1515 | } |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 1516 | |
| 1517 | pr_debug("%s: asoc:%p rwnd decreased by %d to (%u, %u, %u)\n", |
| 1518 | __func__, asoc, len, asoc->rwnd, asoc->rwnd_over, |
| 1519 | asoc->rwnd_press); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | } |
| 1521 | |
| 1522 | /* Build the bind address list for the association based on info from the |
| 1523 | * local endpoint and the remote peer. |
| 1524 | */ |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1525 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, |
Vlad Yasevich | 409b95a | 2009-11-10 08:57:34 +0000 | [diff] [blame] | 1526 | sctp_scope_t scope, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | int flags; |
| 1529 | |
| 1530 | /* Use scoping rules to determine the subset of addresses from |
| 1531 | * the endpoint. |
| 1532 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | flags = (PF_INET6 == asoc->base.sk->sk_family) ? SCTP_ADDR6_ALLOWED : 0; |
| 1534 | if (asoc->peer.ipv4_address) |
| 1535 | flags |= SCTP_ADDR4_PEERSUPP; |
| 1536 | if (asoc->peer.ipv6_address) |
| 1537 | flags |= SCTP_ADDR6_PEERSUPP; |
| 1538 | |
Eric W. Biederman | 4db67e8 | 2012-08-06 08:42:04 +0000 | [diff] [blame] | 1539 | return sctp_bind_addr_copy(sock_net(asoc->base.sk), |
| 1540 | &asoc->base.bind_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | &asoc->ep->base.bind_addr, |
| 1542 | scope, gfp, flags); |
| 1543 | } |
| 1544 | |
| 1545 | /* Build the association's bind address list from the cookie. */ |
| 1546 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *asoc, |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1547 | struct sctp_cookie *cookie, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1548 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | { |
| 1550 | int var_size2 = ntohs(cookie->peer_init->chunk_hdr.length); |
| 1551 | int var_size3 = cookie->raw_addr_list_len; |
| 1552 | __u8 *raw = (__u8 *)cookie->peer_init + var_size2; |
| 1553 | |
| 1554 | return sctp_raw_to_bind_addrs(&asoc->base.bind_addr, raw, var_size3, |
| 1555 | asoc->ep->base.bind_addr.port, gfp); |
| 1556 | } |
| 1557 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1558 | /* Lookup laddr in the bind address list of an association. */ |
| 1559 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | const union sctp_addr *laddr) |
| 1561 | { |
Vlad Yasevich | 559cf71 | 2007-09-16 16:03:28 -0700 | [diff] [blame] | 1562 | int found = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | if ((asoc->base.bind_addr.port == ntohs(laddr->v4.sin_port)) && |
| 1565 | sctp_bind_addr_match(&asoc->base.bind_addr, laddr, |
Vlad Yasevich | 559cf71 | 2007-09-16 16:03:28 -0700 | [diff] [blame] | 1566 | sctp_sk(asoc->base.sk))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | found = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | return found; |
| 1570 | } |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1571 | |
| 1572 | /* Set an association id for a given association */ |
| 1573 | int sctp_assoc_set_id(struct sctp_association *asoc, gfp_t gfp) |
| 1574 | { |
Tejun Heo | 94960e8 | 2013-02-27 17:05:00 -0800 | [diff] [blame] | 1575 | bool preload = gfp & __GFP_WAIT; |
| 1576 | int ret; |
Vlad Yasevich | c6ba68a | 2009-06-01 12:41:15 -0400 | [diff] [blame] | 1577 | |
| 1578 | /* If the id is already assigned, keep it. */ |
| 1579 | if (asoc->assoc_id) |
Tejun Heo | 94960e8 | 2013-02-27 17:05:00 -0800 | [diff] [blame] | 1580 | return 0; |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1581 | |
Tejun Heo | 94960e8 | 2013-02-27 17:05:00 -0800 | [diff] [blame] | 1582 | if (preload) |
| 1583 | idr_preload(gfp); |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1584 | spin_lock_bh(&sctp_assocs_id_lock); |
Jeff Layton | 713e00a | 2013-04-29 16:21:22 -0700 | [diff] [blame] | 1585 | /* 0 is not a valid assoc_id, must be >= 1 */ |
| 1586 | ret = idr_alloc_cyclic(&sctp_assocs_id, asoc, 1, 0, GFP_NOWAIT); |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1587 | spin_unlock_bh(&sctp_assocs_id_lock); |
Tejun Heo | 94960e8 | 2013-02-27 17:05:00 -0800 | [diff] [blame] | 1588 | if (preload) |
| 1589 | idr_preload_end(); |
| 1590 | if (ret < 0) |
| 1591 | return ret; |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1592 | |
Tejun Heo | 94960e8 | 2013-02-27 17:05:00 -0800 | [diff] [blame] | 1593 | asoc->assoc_id = (sctp_assoc_t)ret; |
| 1594 | return 0; |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1595 | } |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1596 | |
Wei Yongjun | 8b4472c | 2011-05-24 21:48:02 +0000 | [diff] [blame] | 1597 | /* Free the ASCONF queue */ |
| 1598 | static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc) |
| 1599 | { |
| 1600 | struct sctp_chunk *asconf; |
| 1601 | struct sctp_chunk *tmp; |
| 1602 | |
| 1603 | list_for_each_entry_safe(asconf, tmp, &asoc->addip_chunk_list, list) { |
| 1604 | list_del_init(&asconf->list); |
| 1605 | sctp_chunk_free(asconf); |
| 1606 | } |
| 1607 | } |
| 1608 | |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1609 | /* Free asconf_ack cache */ |
| 1610 | static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc) |
| 1611 | { |
| 1612 | struct sctp_chunk *ack; |
| 1613 | struct sctp_chunk *tmp; |
| 1614 | |
| 1615 | list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list, |
| 1616 | transmitted_list) { |
| 1617 | list_del_init(&ack->transmitted_list); |
| 1618 | sctp_chunk_free(ack); |
| 1619 | } |
| 1620 | } |
| 1621 | |
| 1622 | /* Clean up the ASCONF_ACK queue */ |
| 1623 | void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc) |
| 1624 | { |
| 1625 | struct sctp_chunk *ack; |
| 1626 | struct sctp_chunk *tmp; |
| 1627 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1628 | /* We can remove all the entries from the queue up to |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1629 | * the "Peer-Sequence-Number". |
| 1630 | */ |
| 1631 | list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list, |
| 1632 | transmitted_list) { |
| 1633 | if (ack->subh.addip_hdr->serial == |
| 1634 | htonl(asoc->peer.addip_serial)) |
| 1635 | break; |
| 1636 | |
| 1637 | list_del_init(&ack->transmitted_list); |
| 1638 | sctp_chunk_free(ack); |
| 1639 | } |
| 1640 | } |
| 1641 | |
| 1642 | /* Find the ASCONF_ACK whose serial number matches ASCONF */ |
| 1643 | struct sctp_chunk *sctp_assoc_lookup_asconf_ack( |
| 1644 | const struct sctp_association *asoc, |
| 1645 | __be32 serial) |
| 1646 | { |
Wei Yongjun | a869981 | 2008-02-05 23:35:04 +0900 | [diff] [blame] | 1647 | struct sctp_chunk *ack; |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1648 | |
| 1649 | /* Walk through the list of cached ASCONF-ACKs and find the |
| 1650 | * ack chunk whose serial number matches that of the request. |
| 1651 | */ |
| 1652 | list_for_each_entry(ack, &asoc->asconf_ack_list, transmitted_list) { |
| 1653 | if (ack->subh.addip_hdr->serial == serial) { |
| 1654 | sctp_chunk_hold(ack); |
Wei Yongjun | a869981 | 2008-02-05 23:35:04 +0900 | [diff] [blame] | 1655 | return ack; |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1656 | } |
| 1657 | } |
| 1658 | |
Wei Yongjun | a869981 | 2008-02-05 23:35:04 +0900 | [diff] [blame] | 1659 | return NULL; |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1660 | } |
Wei Yongjun | a000c01 | 2011-05-29 23:23:36 +0000 | [diff] [blame] | 1661 | |
| 1662 | void sctp_asconf_queue_teardown(struct sctp_association *asoc) |
| 1663 | { |
| 1664 | /* Free any cached ASCONF_ACK chunk. */ |
| 1665 | sctp_assoc_free_asconf_acks(asoc); |
| 1666 | |
| 1667 | /* Free the ASCONF queue. */ |
| 1668 | sctp_assoc_free_asconf_queue(asoc); |
| 1669 | |
| 1670 | /* Free any cached ASCONF chunk. */ |
| 1671 | if (asoc->addip_last_asconf) |
| 1672 | sctp_chunk_free(asoc->addip_last_asconf); |
| 1673 | } |