Thomas Gleixner | 47505b8 | 2019-05-23 11:14:41 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 2 | /* SCTP kernel implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * (C) Copyright IBM Corp. 2001, 2004 |
| 4 | * Copyright (c) 1999-2000 Cisco, Inc. |
| 5 | * Copyright (c) 1999-2001 Motorola, Inc. |
| 6 | * Copyright (c) 2001 Intel Corp. |
| 7 | * Copyright (c) 2001 La Monte H.P. Yarroll |
| 8 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 9 | * This file is part of the SCTP kernel implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 11 | * This module provides the abstraction for an SCTP association. |
| 12 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * Please send any bug reports or fixes you make to the |
| 14 | * email address(es): |
Daniel Borkmann | 91705c6 | 2013-07-23 14:51:47 +0200 | [diff] [blame] | 15 | * lksctp developers <linux-sctp@vger.kernel.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | * Written or modified by: |
| 18 | * La Monte H.P. Yarroll <piggy@acm.org> |
| 19 | * Karl Knutson <karl@athena.chicago.il.us> |
| 20 | * Jon Grimm <jgrimm@us.ibm.com> |
| 21 | * Xingang Guo <xingang.guo@intel.com> |
| 22 | * Hui Huang <hui.huang@nokia.com> |
| 23 | * Sridhar Samudrala <sri@us.ibm.com> |
| 24 | * Daisy Chang <daisyc@us.ibm.com> |
| 25 | * Ryan Layer <rmlayer@us.ibm.com> |
| 26 | * Kevin Gao <kevin.gao@intel.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | */ |
| 28 | |
Joe Perches | 145ce50 | 2010-08-24 13:21:08 +0000 | [diff] [blame] | 29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/types.h> |
| 32 | #include <linux/fcntl.h> |
| 33 | #include <linux/poll.h> |
| 34 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include <linux/slab.h> |
| 37 | #include <linux/in.h> |
| 38 | #include <net/ipv6.h> |
| 39 | #include <net/sctp/sctp.h> |
| 40 | #include <net/sctp/sm.h> |
| 41 | |
| 42 | /* Forward declarations for internal functions. */ |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 43 | static void sctp_select_active_and_retran_path(struct sctp_association *asoc); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 44 | static void sctp_assoc_bh_rcv(struct work_struct *work); |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 45 | static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc); |
Wei Yongjun | 8b4472c | 2011-05-24 21:48:02 +0000 | [diff] [blame] | 46 | static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | /* 1st Level Abstractions. */ |
| 49 | |
| 50 | /* Initialize a new association from provided memory. */ |
Xin Long | 1c66201 | 2017-08-05 19:59:54 +0800 | [diff] [blame] | 51 | static struct sctp_association *sctp_association_init( |
| 52 | struct sctp_association *asoc, |
| 53 | const struct sctp_endpoint *ep, |
| 54 | const struct sock *sk, |
| 55 | enum sctp_scope scope, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | { |
| 57 | struct sctp_sock *sp; |
Xin Long | 3c91870 | 2017-06-30 11:52:16 +0800 | [diff] [blame] | 58 | struct sctp_paramhdr *p; |
Xin Long | 5819477 | 2017-03-20 18:00:28 +0800 | [diff] [blame] | 59 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
| 61 | /* Retrieve the SCTP per socket area. */ |
| 62 | sp = sctp_sk((struct sock *)sk); |
| 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | /* Discarding const is appropriate here. */ |
| 65 | asoc->ep = (struct sctp_endpoint *)ep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | asoc->base.sk = (struct sock *)sk; |
Xin Long | 3124346 | 2019-11-23 11:56:49 +0800 | [diff] [blame] | 67 | asoc->base.net = sock_net(sk); |
Daniel Borkmann | 2e0c9e7 | 2013-06-14 18:24:07 +0200 | [diff] [blame] | 68 | |
| 69 | sctp_endpoint_hold(asoc->ep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | sock_hold(asoc->base.sk); |
| 71 | |
| 72 | /* Initialize the common base substructure. */ |
| 73 | asoc->base.type = SCTP_EP_TYPE_ASSOCIATION; |
| 74 | |
| 75 | /* Initialize the object handling fields. */ |
Reshetova, Elena | c638457 | 2017-07-04 15:53:28 +0300 | [diff] [blame] | 76 | refcount_set(&asoc->base.refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
| 78 | /* Initialize the bind addr area. */ |
| 79 | 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] | 80 | |
| 81 | asoc->state = SCTP_STATE_CLOSED; |
Daniel Borkmann | 52db882 | 2013-06-25 18:17:27 +0200 | [diff] [blame] | 82 | asoc->cookie_life = ms_to_ktime(sp->assocparams.sasoc_cookie_life); |
Vlad Yasevich | f68b2e0 | 2009-09-04 18:21:00 -0400 | [diff] [blame] | 83 | asoc->user_frag = sp->user_frag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
| 85 | /* Set the association max_retrans and RTO values from the |
| 86 | * socket values. |
| 87 | */ |
| 88 | asoc->max_retrans = sp->assocparams.sasoc_asocmaxrxt; |
Xin Long | 8add543 | 2019-01-28 15:08:29 +0800 | [diff] [blame] | 89 | asoc->pf_retrans = sp->pf_retrans; |
Xin Long | 34515e9 | 2019-11-08 13:20:35 +0800 | [diff] [blame] | 90 | asoc->ps_retrans = sp->ps_retrans; |
Xin Long | aef587b | 2019-11-08 13:20:32 +0800 | [diff] [blame] | 91 | asoc->pf_expose = sp->pf_expose; |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | asoc->rto_initial = msecs_to_jiffies(sp->rtoinfo.srto_initial); |
| 94 | asoc->rto_max = msecs_to_jiffies(sp->rtoinfo.srto_max); |
| 95 | asoc->rto_min = msecs_to_jiffies(sp->rtoinfo.srto_min); |
| 96 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 97 | /* Initialize the association's heartbeat interval based on the |
| 98 | * sock configured value. |
| 99 | */ |
| 100 | asoc->hbinterval = msecs_to_jiffies(sp->hbinterval); |
| 101 | |
| 102 | /* Initialize path max retrans value. */ |
| 103 | asoc->pathmaxrxt = sp->pathmaxrxt; |
| 104 | |
Xin Long | 8a9c58d | 2018-07-02 18:21:12 +0800 | [diff] [blame] | 105 | asoc->flowlabel = sp->flowlabel; |
| 106 | asoc->dscp = sp->dscp; |
| 107 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 108 | /* Set association default SACK delay */ |
| 109 | asoc->sackdelay = msecs_to_jiffies(sp->sackdelay); |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 110 | asoc->sackfreq = sp->sackfreq; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 111 | |
| 112 | /* Set the association default flags controlling |
| 113 | * Heartbeat, SACK delay, and Path MTU Discovery. |
| 114 | */ |
| 115 | asoc->param_flags = sp->param_flags; |
| 116 | |
wangweidong | 9d2c881 | 2013-12-06 09:36:30 +0800 | [diff] [blame] | 117 | /* Initialize the maximum number of new data packets that can be sent |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | * in a burst. |
| 119 | */ |
Vlad Yasevich | 7033157 | 2007-03-23 11:34:36 -0700 | [diff] [blame] | 120 | asoc->max_burst = sp->max_burst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
Xin Long | a1e3a05 | 2018-11-18 16:08:52 +0800 | [diff] [blame] | 122 | asoc->subscribe = sp->subscribe; |
| 123 | |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 124 | /* initialize association timers */ |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 125 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] = asoc->rto_initial; |
| 126 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] = asoc->rto_initial; |
| 127 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] = asoc->rto_initial; |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 128 | |
| 129 | /* sctpimpguide Section 2.12.2 |
| 130 | * If the 'T5-shutdown-guard' timer is used, it SHOULD be set to the |
| 131 | * recommended value of 5 times 'RTO.Max'. |
| 132 | */ |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 133 | asoc->timeouts[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD] |
Vladislav Yasevich | 1e7d3d9 | 2005-11-11 16:06:16 -0800 | [diff] [blame] | 134 | = 5 * asoc->rto_max; |
| 135 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 136 | asoc->timeouts[SCTP_EVENT_TIMEOUT_SACK] = asoc->sackdelay; |
Neil Horman | 9f70f46 | 2013-12-10 06:48:15 -0500 | [diff] [blame] | 137 | asoc->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] = sp->autoclose * HZ; |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 138 | |
Uwe Kleine-König | 421f91d | 2010-06-11 12:17:00 +0200 | [diff] [blame] | 139 | /* Initializes the timers */ |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 140 | for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) |
Kees Cook | 9c3b575 | 2017-10-24 01:45:31 -0700 | [diff] [blame] | 141 | timer_setup(&asoc->timers[i], sctp_timer_events[i], 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | /* Pull default initialization values from the sock options. |
| 144 | * Note: This assumes that the values have already been |
| 145 | * validated in the sock. |
| 146 | */ |
| 147 | asoc->c.sinit_max_instreams = sp->initmsg.sinit_max_instreams; |
| 148 | asoc->c.sinit_num_ostreams = sp->initmsg.sinit_num_ostreams; |
| 149 | asoc->max_init_attempts = sp->initmsg.sinit_max_attempts; |
| 150 | |
| 151 | asoc->max_init_timeo = |
| 152 | msecs_to_jiffies(sp->initmsg.sinit_max_init_timeo); |
| 153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | /* Set the local window size for receive. |
| 155 | * This is also the rcvbuf space per association. |
| 156 | * RFC 6 - A SCTP receiver MUST be able to receive a minimum of |
| 157 | * 1500 bytes in one SCTP packet. |
| 158 | */ |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 159 | if ((sk->sk_rcvbuf/2) < SCTP_DEFAULT_MINWINDOW) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | asoc->rwnd = SCTP_DEFAULT_MINWINDOW; |
| 161 | else |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 162 | asoc->rwnd = sk->sk_rcvbuf/2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
| 164 | asoc->a_rwnd = asoc->rwnd; |
| 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | /* Use my own max window until I learn something better. */ |
| 167 | asoc->peer.rwnd = SCTP_DEFAULT_MAXWINDOW; |
| 168 | |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 169 | /* Initialize the receive memory counter */ |
| 170 | atomic_set(&asoc->rmem_alloc, 0); |
| 171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | init_waitqueue_head(&asoc->wait); |
| 173 | |
| 174 | asoc->c.my_vtag = sctp_generate_tag(ep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | asoc->c.my_port = ep->base.bind_addr.port; |
| 176 | |
| 177 | asoc->c.initial_tsn = sctp_generate_tsn(ep); |
| 178 | |
| 179 | asoc->next_tsn = asoc->c.initial_tsn; |
| 180 | |
| 181 | asoc->ctsn_ack_point = asoc->next_tsn - 1; |
| 182 | asoc->adv_peer_ack_point = asoc->ctsn_ack_point; |
| 183 | asoc->highest_sacked = asoc->ctsn_ack_point; |
| 184 | asoc->last_cwr_tsn = asoc->ctsn_ack_point; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | /* ADDIP Section 4.1 Asconf Chunk Procedures |
| 187 | * |
| 188 | * When an endpoint has an ASCONF signaled change to be sent to the |
| 189 | * remote endpoint it should do the following: |
| 190 | * ... |
| 191 | * A2) a serial number should be assigned to the chunk. The serial |
| 192 | * number SHOULD be a monotonically increasing number. The serial |
| 193 | * numbers SHOULD be initialized at the start of the |
| 194 | * association to the same value as the initial TSN. |
| 195 | */ |
| 196 | asoc->addip_serial = asoc->c.initial_tsn; |
Xin Long | cc16f00 | 2017-01-18 00:44:42 +0800 | [diff] [blame] | 197 | asoc->strreset_outseq = asoc->c.initial_tsn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
David S. Miller | 79af02c | 2005-07-08 21:47:49 -0700 | [diff] [blame] | 199 | INIT_LIST_HEAD(&asoc->addip_chunk_list); |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 200 | INIT_LIST_HEAD(&asoc->asconf_ack_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
| 202 | /* Make an empty list of remote transport addresses. */ |
| 203 | INIT_LIST_HEAD(&asoc->peer.transport_addr_list); |
| 204 | |
| 205 | /* RFC 2960 5.1 Normal Establishment of an Association |
| 206 | * |
| 207 | * After the reception of the first data chunk in an |
| 208 | * association the endpoint must immediately respond with a |
| 209 | * sack to acknowledge the data chunk. Subsequent |
| 210 | * acknowledgements should be done as described in Section |
| 211 | * 6.2. |
| 212 | * |
| 213 | * [We implement this by telling a new association that it |
| 214 | * already received one packet.] |
| 215 | */ |
| 216 | asoc->peer.sack_needed = 1; |
Neil Horman | 4244854 | 2012-06-30 03:04:26 +0000 | [diff] [blame] | 217 | asoc->peer.sack_generation = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | /* Create an input queue. */ |
| 220 | sctp_inq_init(&asoc->base.inqueue); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 221 | sctp_inq_set_th_handler(&asoc->base.inqueue, sctp_assoc_bh_rcv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | /* Create an output queue. */ |
| 224 | sctp_outq_init(asoc, &asoc->outqueue); |
| 225 | |
| 226 | if (!sctp_ulpq_init(&asoc->ulpq, asoc)) |
| 227 | goto fail_init; |
| 228 | |
Xin Long | ff35641 | 2017-05-31 16:36:32 +0800 | [diff] [blame] | 229 | if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, |
| 230 | 0, gfp)) |
Xin Long | 3dbcc10 | 2017-03-30 01:00:53 +0800 | [diff] [blame] | 231 | goto fail_init; |
| 232 | |
Xin Long | 4135cce | 2018-11-27 19:11:50 +0800 | [diff] [blame] | 233 | /* Initialize default path MTU. */ |
| 234 | asoc->pathmtu = sp->pathmtu; |
| 235 | sctp_assoc_update_frag_point(asoc); |
| 236 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | /* Assume that peer would support both address types unless we are |
| 238 | * told otherwise. |
| 239 | */ |
| 240 | asoc->peer.ipv4_address = 1; |
Wei Yongjun | a2c3958 | 2009-04-07 16:35:11 +0800 | [diff] [blame] | 241 | if (asoc->base.sk->sk_family == PF_INET6) |
| 242 | asoc->peer.ipv6_address = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | INIT_LIST_HEAD(&asoc->asocs); |
| 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | asoc->default_stream = sp->default_stream; |
| 246 | asoc->default_ppid = sp->default_ppid; |
| 247 | asoc->default_flags = sp->default_flags; |
| 248 | asoc->default_context = sp->default_context; |
| 249 | asoc->default_timetolive = sp->default_timetolive; |
Ivan Skytte Jorgensen | 6ab792f | 2006-12-13 16:34:22 -0800 | [diff] [blame] | 250 | asoc->default_rcv_context = sp->default_rcv_context; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 252 | /* AUTH related initializations */ |
| 253 | INIT_LIST_HEAD(&asoc->endpoint_shared_keys); |
Xin Long | 5819477 | 2017-03-20 18:00:28 +0800 | [diff] [blame] | 254 | if (sctp_auth_asoc_copy_shkeys(ep, asoc, gfp)) |
Xin Long | 3dbcc10 | 2017-03-30 01:00:53 +0800 | [diff] [blame] | 255 | goto stream_free; |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 256 | |
| 257 | asoc->active_key_id = ep->active_key_id; |
Xin Long | 9fb657a | 2017-01-18 00:44:46 +0800 | [diff] [blame] | 258 | asoc->strreset_enable = ep->strreset_enable; |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 259 | |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 260 | /* Save the hmacs and chunks list into this association */ |
| 261 | if (ep->auth_hmacs_list) |
| 262 | memcpy(asoc->c.auth_hmacs, ep->auth_hmacs_list, |
| 263 | ntohs(ep->auth_hmacs_list->param_hdr.length)); |
| 264 | if (ep->auth_chunk_list) |
| 265 | memcpy(asoc->c.auth_chunks, ep->auth_chunk_list, |
| 266 | ntohs(ep->auth_chunk_list->param_hdr.length)); |
| 267 | |
| 268 | /* Get the AUTH random number for this association */ |
Xin Long | 3c91870 | 2017-06-30 11:52:16 +0800 | [diff] [blame] | 269 | p = (struct sctp_paramhdr *)asoc->c.auth_random; |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 270 | p->type = SCTP_PARAM_RANDOM; |
Xin Long | 3c91870 | 2017-06-30 11:52:16 +0800 | [diff] [blame] | 271 | p->length = htons(sizeof(*p) + SCTP_AUTH_RANDOM_LENGTH); |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 272 | get_random_bytes(p+1, SCTP_AUTH_RANDOM_LENGTH); |
| 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | return asoc; |
| 275 | |
Xin Long | 3dbcc10 | 2017-03-30 01:00:53 +0800 | [diff] [blame] | 276 | stream_free: |
Xin Long | cee360a | 2017-05-31 16:36:31 +0800 | [diff] [blame] | 277 | sctp_stream_free(&asoc->stream); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | fail_init: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | sock_put(asoc->base.sk); |
Daniel Borkmann | 2e0c9e7 | 2013-06-14 18:24:07 +0200 | [diff] [blame] | 280 | sctp_endpoint_put(asoc->ep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | return NULL; |
| 282 | } |
| 283 | |
| 284 | /* Allocate and initialize a new association */ |
| 285 | struct sctp_association *sctp_association_new(const struct sctp_endpoint *ep, |
Xin Long | 1c66201 | 2017-08-05 19:59:54 +0800 | [diff] [blame] | 286 | const struct sock *sk, |
| 287 | enum sctp_scope scope, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | { |
| 289 | struct sctp_association *asoc; |
| 290 | |
Daniel Borkmann | 939cfa7 | 2013-06-17 11:40:04 +0200 | [diff] [blame] | 291 | asoc = kzalloc(sizeof(*asoc), gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | if (!asoc) |
| 293 | goto fail; |
| 294 | |
| 295 | if (!sctp_association_init(asoc, ep, sk, scope, gfp)) |
| 296 | goto fail_init; |
| 297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | SCTP_DBG_OBJCNT_INC(assoc); |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 299 | |
| 300 | pr_debug("Created asoc %p\n", asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
| 302 | return asoc; |
| 303 | |
| 304 | fail_init: |
| 305 | kfree(asoc); |
| 306 | fail: |
| 307 | return NULL; |
| 308 | } |
| 309 | |
| 310 | /* Free this association if possible. There may still be users, so |
| 311 | * the actual deallocation may be delayed. |
| 312 | */ |
| 313 | void sctp_association_free(struct sctp_association *asoc) |
| 314 | { |
| 315 | struct sock *sk = asoc->base.sk; |
| 316 | struct sctp_transport *transport; |
| 317 | struct list_head *pos, *temp; |
| 318 | int i; |
| 319 | |
Vlad Yasevich | de76e69 | 2006-10-30 18:55:11 -0800 | [diff] [blame] | 320 | /* Only real associations count against the endpoint, so |
| 321 | * don't bother for if this is a temporary association. |
| 322 | */ |
Xufeng Zhang | d3217b1 | 2014-06-12 10:53:36 +0800 | [diff] [blame] | 323 | if (!list_empty(&asoc->asocs)) { |
Vlad Yasevich | de76e69 | 2006-10-30 18:55:11 -0800 | [diff] [blame] | 324 | list_del(&asoc->asocs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
Vlad Yasevich | de76e69 | 2006-10-30 18:55:11 -0800 | [diff] [blame] | 326 | /* Decrement the backlog value for a TCP-style listening |
| 327 | * socket. |
| 328 | */ |
| 329 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) |
Eric Dumazet | 7976a11 | 2019-11-05 14:11:52 -0800 | [diff] [blame] | 330 | sk_acceptq_removed(sk); |
Vlad Yasevich | de76e69 | 2006-10-30 18:55:11 -0800 | [diff] [blame] | 331 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
| 333 | /* Mark as dead, so other users can know this structure is |
| 334 | * going away. |
| 335 | */ |
Daniel Borkmann | 0022d2d | 2013-04-15 03:27:18 +0000 | [diff] [blame] | 336 | asoc->base.dead = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
| 338 | /* Dispose of any data lying around in the outqueue. */ |
| 339 | sctp_outq_free(&asoc->outqueue); |
| 340 | |
| 341 | /* Dispose of any pending messages for the upper layer. */ |
| 342 | sctp_ulpq_free(&asoc->ulpq); |
| 343 | |
| 344 | /* Dispose of any pending chunks on the inqueue. */ |
| 345 | sctp_inq_free(&asoc->base.inqueue); |
| 346 | |
Vlad Yasevich | 8e1ee18 | 2008-10-08 14:18:39 -0700 | [diff] [blame] | 347 | sctp_tsnmap_free(&asoc->peer.tsn_map); |
| 348 | |
Xin Long | a838631 | 2017-01-06 22:18:33 +0800 | [diff] [blame] | 349 | /* Free stream information. */ |
Xin Long | cee360a | 2017-05-31 16:36:31 +0800 | [diff] [blame] | 350 | sctp_stream_free(&asoc->stream); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
Xin Long | 7b9438d | 2017-01-18 00:44:43 +0800 | [diff] [blame] | 352 | if (asoc->strreset_chunk) |
| 353 | sctp_chunk_free(asoc->strreset_chunk); |
| 354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | /* Clean up the bound address list. */ |
| 356 | sctp_bind_addr_free(&asoc->base.bind_addr); |
| 357 | |
| 358 | /* Do we need to go through all of our timers and |
| 359 | * delete them? To be safe we will try to delete all, but we |
| 360 | * should be able to go through and make a guess based |
| 361 | * on our state. |
| 362 | */ |
| 363 | for (i = SCTP_EVENT_TIMEOUT_NONE; i < SCTP_NUM_TIMEOUT_TYPES; ++i) { |
Ying Xue | 25cc4ae9 | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 364 | if (del_timer(&asoc->timers[i])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | sctp_association_put(asoc); |
| 366 | } |
| 367 | |
| 368 | /* Free peer's cached cookie. */ |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 369 | kfree(asoc->peer.cookie); |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 370 | kfree(asoc->peer.peer_random); |
| 371 | kfree(asoc->peer.peer_chunks); |
| 372 | kfree(asoc->peer.peer_hmacs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
| 374 | /* Release the transport structures. */ |
| 375 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 376 | transport = list_entry(pos, struct sctp_transport, transports); |
Thomas Graf | 45122ca26 | 2012-12-06 09:25:05 +0000 | [diff] [blame] | 377 | list_del_rcu(pos); |
Xin Long | 4f00878 | 2015-12-30 23:50:47 +0800 | [diff] [blame] | 378 | sctp_unhash_transport(transport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | sctp_transport_free(transport); |
| 380 | } |
| 381 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 382 | asoc->peer.transport_count = 0; |
| 383 | |
Wei Yongjun | a000c01 | 2011-05-29 23:23:36 +0000 | [diff] [blame] | 384 | sctp_asconf_queue_teardown(asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 386 | /* Free pending address space being deleted */ |
Markus Elfring | 7d37d0c | 2015-01-31 18:10:03 +0100 | [diff] [blame] | 387 | kfree(asoc->asconf_addr_del_pending); |
Michio Honda | 8a07eb0 | 2011-04-26 20:19:36 +0900 | [diff] [blame] | 388 | |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 389 | /* AUTH - Free the endpoint shared keys */ |
| 390 | sctp_auth_destroy_keys(&asoc->endpoint_shared_keys); |
| 391 | |
| 392 | /* AUTH - Free the association shared key */ |
| 393 | sctp_auth_key_put(asoc->asoc_shared_key); |
| 394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | sctp_association_put(asoc); |
| 396 | } |
| 397 | |
| 398 | /* Cleanup and free up an association. */ |
| 399 | static void sctp_association_destroy(struct sctp_association *asoc) |
| 400 | { |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 401 | if (unlikely(!asoc->base.dead)) { |
| 402 | WARN(1, "Attempt to destroy undead association %p!\n", asoc); |
| 403 | return; |
| 404 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
| 406 | sctp_endpoint_put(asoc->ep); |
| 407 | sock_put(asoc->base.sk); |
| 408 | |
| 409 | if (asoc->assoc_id != 0) { |
| 410 | spin_lock_bh(&sctp_assocs_id_lock); |
| 411 | idr_remove(&sctp_assocs_id, asoc->assoc_id); |
| 412 | spin_unlock_bh(&sctp_assocs_id_lock); |
| 413 | } |
| 414 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 415 | WARN_ON(atomic_read(&asoc->rmem_alloc)); |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 416 | |
Xin Long | fb6df5a | 2018-12-01 01:36:59 +0800 | [diff] [blame] | 417 | kfree_rcu(asoc, rcu); |
Daniel Borkmann | ff2266c | 2013-04-15 03:27:17 +0000 | [diff] [blame] | 418 | SCTP_DBG_OBJCNT_DEC(assoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | /* Change the primary destination address for the peer. */ |
| 422 | void sctp_assoc_set_primary(struct sctp_association *asoc, |
| 423 | struct sctp_transport *transport) |
| 424 | { |
Vlad Yasevich | 319fa2a | 2008-06-16 17:00:29 -0700 | [diff] [blame] | 425 | int changeover = 0; |
| 426 | |
| 427 | /* it's a changeover only if we already have a primary path |
| 428 | * that we are changing |
| 429 | */ |
| 430 | if (asoc->peer.primary_path != NULL && |
| 431 | asoc->peer.primary_path != transport) |
| 432 | changeover = 1 ; |
| 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | asoc->peer.primary_path = transport; |
Jonas Falkevik | 50ce4c0 | 2020-05-27 11:59:43 +0200 | [diff] [blame] | 435 | sctp_ulpevent_notify_peer_addr_change(transport, |
Xin Long | 5cd0b91 | 2019-10-08 19:27:35 +0800 | [diff] [blame] | 436 | SCTP_ADDR_MADE_PRIM, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
| 438 | /* Set a default msg_name for events. */ |
| 439 | memcpy(&asoc->peer.primary_addr, &transport->ipaddr, |
| 440 | sizeof(union sctp_addr)); |
| 441 | |
| 442 | /* If the primary path is changing, assume that the |
| 443 | * user wants to use this new path. |
| 444 | */ |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 445 | if ((transport->state == SCTP_ACTIVE) || |
| 446 | (transport->state == SCTP_UNKNOWN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | asoc->peer.active_path = transport; |
| 448 | |
| 449 | /* |
| 450 | * SFR-CACC algorithm: |
| 451 | * Upon the receipt of a request to change the primary |
| 452 | * destination address, on the data structure for the new |
| 453 | * primary destination, the sender MUST do the following: |
| 454 | * |
| 455 | * 1) If CHANGEOVER_ACTIVE is set, then there was a switch |
| 456 | * to this destination address earlier. The sender MUST set |
| 457 | * CYCLING_CHANGEOVER to indicate that this switch is a |
| 458 | * double switch to the same destination address. |
Vlad Yasevich | e0e9db1 | 2009-11-23 15:53:57 -0500 | [diff] [blame] | 459 | * |
| 460 | * Really, only bother is we have data queued or outstanding on |
| 461 | * the association. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | */ |
Vlad Yasevich | e0e9db1 | 2009-11-23 15:53:57 -0500 | [diff] [blame] | 463 | if (!asoc->outqueue.outstanding_bytes && !asoc->outqueue.out_qlen) |
| 464 | return; |
| 465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | if (transport->cacc.changeover_active) |
Vlad Yasevich | 319fa2a | 2008-06-16 17:00:29 -0700 | [diff] [blame] | 467 | transport->cacc.cycling_changeover = changeover; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
| 469 | /* 2) The sender MUST set CHANGEOVER_ACTIVE to indicate that |
| 470 | * a changeover has occurred. |
| 471 | */ |
Vlad Yasevich | 319fa2a | 2008-06-16 17:00:29 -0700 | [diff] [blame] | 472 | transport->cacc.changeover_active = changeover; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
| 474 | /* 3) The sender MUST store the next TSN to be sent in |
| 475 | * next_tsn_at_change. |
| 476 | */ |
| 477 | transport->cacc.next_tsn_at_change = asoc->next_tsn; |
| 478 | } |
| 479 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 480 | /* Remove a transport from an association. */ |
| 481 | void sctp_assoc_rm_peer(struct sctp_association *asoc, |
| 482 | struct sctp_transport *peer) |
| 483 | { |
Xin Long | df132ef | 2018-10-29 23:10:29 +0800 | [diff] [blame] | 484 | struct sctp_transport *transport; |
| 485 | struct list_head *pos; |
| 486 | struct sctp_chunk *ch; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 487 | |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 488 | pr_debug("%s: association:%p addr:%pISpc\n", |
| 489 | __func__, asoc, &peer->ipaddr.sa); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 490 | |
| 491 | /* If we are to remove the current retran_path, update it |
| 492 | * to the next peer before removing this peer from the list. |
| 493 | */ |
| 494 | if (asoc->peer.retran_path == peer) |
| 495 | sctp_assoc_update_retran_path(asoc); |
| 496 | |
| 497 | /* Remove this peer from the list. */ |
Thomas Graf | 45122ca26 | 2012-12-06 09:25:05 +0000 | [diff] [blame] | 498 | list_del_rcu(&peer->transports); |
Xin Long | 4f00878 | 2015-12-30 23:50:47 +0800 | [diff] [blame] | 499 | /* Remove this peer from the transport hashtable */ |
| 500 | sctp_unhash_transport(peer); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 501 | |
| 502 | /* Get the first transport of asoc. */ |
| 503 | pos = asoc->peer.transport_addr_list.next; |
| 504 | transport = list_entry(pos, struct sctp_transport, transports); |
| 505 | |
| 506 | /* Update any entries that match the peer to be deleted. */ |
| 507 | if (asoc->peer.primary_path == peer) |
| 508 | sctp_assoc_set_primary(asoc, transport); |
| 509 | if (asoc->peer.active_path == peer) |
| 510 | asoc->peer.active_path = transport; |
Wei Yongjun | 9494c7c | 2011-04-12 15:22:22 +0000 | [diff] [blame] | 511 | if (asoc->peer.retran_path == peer) |
| 512 | asoc->peer.retran_path = transport; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 513 | if (asoc->peer.last_data_from == peer) |
| 514 | asoc->peer.last_data_from = transport; |
| 515 | |
Xin Long | 7b9438d | 2017-01-18 00:44:43 +0800 | [diff] [blame] | 516 | if (asoc->strreset_chunk && |
| 517 | asoc->strreset_chunk->transport == peer) { |
| 518 | asoc->strreset_chunk->transport = transport; |
| 519 | sctp_transport_reset_reconf_timer(transport); |
| 520 | } |
| 521 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 522 | /* If we remove the transport an INIT was last sent to, set it to |
| 523 | * NULL. Combined with the update of the retran path above, this |
| 524 | * will cause the next INIT to be sent to the next available |
| 525 | * transport, maintaining the cycle. |
| 526 | */ |
| 527 | if (asoc->init_last_sent_to == peer) |
| 528 | asoc->init_last_sent_to = NULL; |
| 529 | |
Wei Yongjun | 6345b19 | 2009-04-26 23:13:35 +0800 | [diff] [blame] | 530 | /* If we remove the transport an SHUTDOWN was last sent to, set it |
| 531 | * to NULL. Combined with the update of the retran path above, this |
| 532 | * will cause the next SHUTDOWN to be sent to the next available |
| 533 | * transport, maintaining the cycle. |
| 534 | */ |
| 535 | if (asoc->shutdown_last_sent_to == peer) |
| 536 | asoc->shutdown_last_sent_to = NULL; |
| 537 | |
Wei Yongjun | 10a43ce | 2009-04-26 23:14:42 +0800 | [diff] [blame] | 538 | /* If we remove the transport an ASCONF was last sent to, set it to |
| 539 | * NULL. |
| 540 | */ |
| 541 | if (asoc->addip_last_asconf && |
| 542 | asoc->addip_last_asconf->transport == peer) |
| 543 | asoc->addip_last_asconf->transport = NULL; |
| 544 | |
Vlad Yasevich | 31b02e1 | 2009-09-04 18:21:00 -0400 | [diff] [blame] | 545 | /* If we have something on the transmitted list, we have to |
| 546 | * save it off. The best place is the active path. |
| 547 | */ |
| 548 | if (!list_empty(&peer->transmitted)) { |
| 549 | struct sctp_transport *active = asoc->peer.active_path; |
Vlad Yasevich | 31b02e1 | 2009-09-04 18:21:00 -0400 | [diff] [blame] | 550 | |
| 551 | /* Reset the transport of each chunk on this list */ |
| 552 | list_for_each_entry(ch, &peer->transmitted, |
| 553 | transmitted_list) { |
| 554 | ch->transport = NULL; |
| 555 | ch->rtt_in_progress = 0; |
| 556 | } |
| 557 | |
| 558 | list_splice_tail_init(&peer->transmitted, |
| 559 | &active->transmitted); |
| 560 | |
| 561 | /* Start a T3 timer here in case it wasn't running so |
| 562 | * that these migrated packets have a chance to get |
wangweidong | 2bccbad | 2013-10-26 16:06:30 +0800 | [diff] [blame] | 563 | * retransmitted. |
Vlad Yasevich | 31b02e1 | 2009-09-04 18:21:00 -0400 | [diff] [blame] | 564 | */ |
| 565 | if (!timer_pending(&active->T3_rtx_timer)) |
| 566 | if (!mod_timer(&active->T3_rtx_timer, |
| 567 | jiffies + active->rto)) |
| 568 | sctp_transport_hold(active); |
| 569 | } |
| 570 | |
Xin Long | df132ef | 2018-10-29 23:10:29 +0800 | [diff] [blame] | 571 | list_for_each_entry(ch, &asoc->outqueue.out_chunk_list, list) |
| 572 | if (ch->transport == peer) |
| 573 | ch->transport = NULL; |
| 574 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 575 | asoc->peer.transport_count--; |
| 576 | |
Jonas Falkevik | 50ce4c0 | 2020-05-27 11:59:43 +0200 | [diff] [blame] | 577 | sctp_ulpevent_notify_peer_addr_change(peer, SCTP_ADDR_REMOVED, 0); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 578 | sctp_transport_free(peer); |
| 579 | } |
| 580 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | /* Add a transport address to an association. */ |
| 582 | struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, |
| 583 | const union sctp_addr *addr, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 584 | const gfp_t gfp, |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 585 | const int peer_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | { |
| 587 | struct sctp_transport *peer; |
| 588 | struct sctp_sock *sp; |
| 589 | unsigned short port; |
| 590 | |
| 591 | sp = sctp_sk(asoc->base.sk); |
| 592 | |
| 593 | /* AF_INET and AF_INET6 share common port field. */ |
Al Viro | 4bdf4b5 | 2006-11-20 17:10:20 -0800 | [diff] [blame] | 594 | port = ntohs(addr->v4.sin_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 596 | pr_debug("%s: association:%p addr:%pISpc state:%d\n", __func__, |
| 597 | asoc, &addr->sa, peer_state); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 598 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | /* Set the port if it has not been set yet. */ |
| 600 | if (0 == asoc->peer.port) |
| 601 | asoc->peer.port = port; |
| 602 | |
| 603 | /* Check to see if this is a duplicate. */ |
| 604 | peer = sctp_assoc_lookup_paddr(asoc, addr); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 605 | if (peer) { |
Vlad Yasevich | add5237 | 2008-09-18 16:28:27 -0700 | [diff] [blame] | 606 | /* An UNKNOWN state is only set on transports added by |
| 607 | * user in sctp_connectx() call. Such transports should be |
| 608 | * considered CONFIRMED per RFC 4960, Section 5.4. |
| 609 | */ |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 610 | if (peer->state == SCTP_UNKNOWN) { |
Vlad Yasevich | add5237 | 2008-09-18 16:28:27 -0700 | [diff] [blame] | 611 | peer->state = SCTP_ACTIVE; |
Sridhar Samudrala | ad8fec1 | 2006-07-21 14:48:50 -0700 | [diff] [blame] | 612 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | return peer; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 614 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
Xin Long | 4e7696d | 2019-12-09 13:45:18 +0800 | [diff] [blame] | 616 | peer = sctp_transport_new(asoc->base.net, addr, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | if (!peer) |
| 618 | return NULL; |
| 619 | |
| 620 | sctp_transport_set_owner(peer, asoc); |
| 621 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 622 | /* Initialize the peer's heartbeat interval based on the |
| 623 | * association configured value. |
| 624 | */ |
| 625 | peer->hbinterval = asoc->hbinterval; |
| 626 | |
| 627 | /* Set the path max_retrans. */ |
| 628 | peer->pathmaxrxt = asoc->pathmaxrxt; |
| 629 | |
wangweidong | 2bccbad | 2013-10-26 16:06:30 +0800 | [diff] [blame] | 630 | /* And the partial failure retrans threshold */ |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 631 | peer->pf_retrans = asoc->pf_retrans; |
Xin Long | 34515e9 | 2019-11-08 13:20:35 +0800 | [diff] [blame] | 632 | /* And the primary path switchover retrans threshold */ |
| 633 | peer->ps_retrans = asoc->ps_retrans; |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 634 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 635 | /* Initialize the peer's SACK delay timeout based on the |
| 636 | * association configured value. |
| 637 | */ |
| 638 | peer->sackdelay = asoc->sackdelay; |
Wei Yongjun | d364d92 | 2008-05-09 15:13:26 -0700 | [diff] [blame] | 639 | peer->sackfreq = asoc->sackfreq; |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 640 | |
Xin Long | 4be4139 | 2018-07-02 18:21:14 +0800 | [diff] [blame] | 641 | if (addr->sa.sa_family == AF_INET6) { |
| 642 | __be32 info = addr->v6.sin6_flowinfo; |
| 643 | |
| 644 | if (info) { |
| 645 | peer->flowlabel = ntohl(info & IPV6_FLOWLABEL_MASK); |
| 646 | peer->flowlabel |= SCTP_FLOWLABEL_SET_MASK; |
| 647 | } else { |
| 648 | peer->flowlabel = asoc->flowlabel; |
| 649 | } |
| 650 | } |
Xin Long | 8a9c58d | 2018-07-02 18:21:12 +0800 | [diff] [blame] | 651 | peer->dscp = asoc->dscp; |
| 652 | |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 653 | /* Enable/disable heartbeat, SACK delay, and path MTU discovery |
| 654 | * based on association setting. |
| 655 | */ |
| 656 | peer->param_flags = asoc->param_flags; |
| 657 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | /* Initialize the pmtu of the transport. */ |
Marcelo Ricardo Leitner | 800e00c | 2018-04-26 16:58:51 -0300 | [diff] [blame] | 659 | sctp_transport_route(peer, NULL, sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
| 661 | /* If this is the first transport addr on this association, |
| 662 | * initialize the association PMTU to the peer's PMTU. |
| 663 | * If not and the current association PMTU is higher than the new |
| 664 | * peer's PMTU, reset the association PMTU to the new peer's PMTU. |
| 665 | */ |
Marcelo Ricardo Leitner | c4b2893 | 2018-04-26 16:58:53 -0300 | [diff] [blame] | 666 | sctp_assoc_set_pmtu(asoc, asoc->pathmtu ? |
| 667 | min_t(int, peer->pathmtu, asoc->pathmtu) : |
| 668 | peer->pathmtu); |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 669 | |
Florian Westphal | 6d0ccba | 2008-07-18 23:04:39 -0700 | [diff] [blame] | 670 | peer->pmtu_pending = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | /* The asoc->peer.port might not be meaningful yet, but |
| 673 | * initialize the packet structure anyway. |
| 674 | */ |
| 675 | sctp_packet_init(&peer->packet, peer, asoc->base.bind_addr.port, |
| 676 | asoc->peer.port); |
| 677 | |
| 678 | /* 7.2.1 Slow-Start |
| 679 | * |
| 680 | * o The initial cwnd before DATA transmission or after a sufficiently |
| 681 | * long idle period MUST be set to |
| 682 | * min(4*MTU, max(2*MTU, 4380 bytes)) |
| 683 | * |
| 684 | * o The initial value of ssthresh MAY be arbitrarily high |
| 685 | * (for example, implementations MAY use the size of the |
| 686 | * receiver advertised window). |
| 687 | */ |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 688 | 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] | 689 | |
| 690 | /* At this point, we may not have the receiver's advertised window, |
| 691 | * so initialize ssthresh to the default value and it will be set |
| 692 | * later when we process the INIT. |
| 693 | */ |
| 694 | peer->ssthresh = SCTP_DEFAULT_MAXWINDOW; |
| 695 | |
| 696 | peer->partial_bytes_acked = 0; |
| 697 | peer->flight_size = 0; |
Vlad Yasevich | 46d5a80 | 2009-11-23 15:54:00 -0500 | [diff] [blame] | 698 | peer->burst_limited = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | /* Set the transport's RTO.initial value */ |
| 701 | peer->rto = asoc->rto_initial; |
Michele Baldessari | 196d675 | 2012-12-01 04:49:42 +0000 | [diff] [blame] | 702 | sctp_max_rto(asoc, peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 704 | /* Set the peer's active state. */ |
| 705 | peer->state = peer_state; |
| 706 | |
Xin Long | 7fda702 | 2016-11-15 23:23:11 +0800 | [diff] [blame] | 707 | /* Add this peer into the transport hashtable */ |
| 708 | if (sctp_hash_transport(peer)) { |
| 709 | sctp_transport_free(peer); |
| 710 | return NULL; |
| 711 | } |
| 712 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | /* Attach the remote transport to our asoc. */ |
Thomas Graf | 45122ca26 | 2012-12-06 09:25:05 +0000 | [diff] [blame] | 714 | list_add_tail_rcu(&peer->transports, &asoc->peer.transport_addr_list); |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 715 | asoc->peer.transport_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | |
Jonas Falkevik | 50ce4c0 | 2020-05-27 11:59:43 +0200 | [diff] [blame] | 717 | sctp_ulpevent_notify_peer_addr_change(peer, SCTP_ADDR_ADDED, 0); |
Xin Long | 4b77403 | 2019-10-08 19:27:33 +0800 | [diff] [blame] | 718 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | /* If we do not yet have a primary path, set one. */ |
| 720 | if (!asoc->peer.primary_path) { |
| 721 | sctp_assoc_set_primary(asoc, peer); |
| 722 | asoc->peer.retran_path = peer; |
| 723 | } |
| 724 | |
Vlad Yasevich | fbdf501 | 2010-04-30 22:39:26 -0400 | [diff] [blame] | 725 | if (asoc->peer.active_path == asoc->peer.retran_path && |
| 726 | peer->state != SCTP_UNCONFIRMED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | asoc->peer.retran_path = peer; |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 728 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | |
| 730 | return peer; |
| 731 | } |
| 732 | |
| 733 | /* Delete a transport address from an association. */ |
| 734 | void sctp_assoc_del_peer(struct sctp_association *asoc, |
| 735 | const union sctp_addr *addr) |
| 736 | { |
| 737 | struct list_head *pos; |
| 738 | struct list_head *temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | struct sctp_transport *transport; |
| 740 | |
| 741 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 742 | transport = list_entry(pos, struct sctp_transport, transports); |
| 743 | if (sctp_cmp_addr_exact(addr, &transport->ipaddr)) { |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 744 | /* Do book keeping for removing the peer and free it. */ |
| 745 | sctp_assoc_rm_peer(asoc, transport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | break; |
| 747 | } |
| 748 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | } |
| 750 | |
| 751 | /* Lookup a transport by address. */ |
| 752 | struct sctp_transport *sctp_assoc_lookup_paddr( |
| 753 | const struct sctp_association *asoc, |
| 754 | const union sctp_addr *address) |
| 755 | { |
| 756 | struct sctp_transport *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | |
| 758 | /* Cycle through all transports searching for a peer address. */ |
| 759 | |
Robert P. J. Day | 9dbc15f0 | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 760 | list_for_each_entry(t, &asoc->peer.transport_addr_list, |
| 761 | transports) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | if (sctp_cmp_addr_exact(address, &t->ipaddr)) |
| 763 | return t; |
| 764 | } |
| 765 | |
| 766 | return NULL; |
| 767 | } |
| 768 | |
Vlad Yasevich | 42e30bf | 2007-12-20 14:08:56 -0800 | [diff] [blame] | 769 | /* Remove all transports except a give one */ |
| 770 | void sctp_assoc_del_nonprimary_peers(struct sctp_association *asoc, |
| 771 | struct sctp_transport *primary) |
| 772 | { |
| 773 | struct sctp_transport *temp; |
| 774 | struct sctp_transport *t; |
| 775 | |
| 776 | list_for_each_entry_safe(t, temp, &asoc->peer.transport_addr_list, |
| 777 | transports) { |
| 778 | /* if the current transport is not the primary one, delete it */ |
| 779 | if (t != primary) |
| 780 | sctp_assoc_rm_peer(asoc, t); |
| 781 | } |
Vlad Yasevich | 42e30bf | 2007-12-20 14:08:56 -0800 | [diff] [blame] | 782 | } |
| 783 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | /* Engage in transport control operations. |
| 785 | * Mark the transport up or down and send a notification to the user. |
| 786 | * Select and update the new active and retran paths. |
| 787 | */ |
| 788 | void sctp_assoc_control_transport(struct sctp_association *asoc, |
| 789 | struct sctp_transport *transport, |
Xin Long | 0ceaeeb | 2017-08-05 19:59:55 +0800 | [diff] [blame] | 790 | enum sctp_transport_cmd command, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | sctp_sn_error_t error) |
| 792 | { |
Xin Long | 768e151 | 2019-11-08 13:20:33 +0800 | [diff] [blame] | 793 | int spc_state = SCTP_ADDR_AVAILABLE; |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 794 | bool ulp_notify = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | |
| 796 | /* Record the transition on the transport. */ |
| 797 | switch (command) { |
| 798 | case SCTP_TRANSPORT_UP: |
Vlad Yasevich | 1ae4114 | 2007-03-23 11:32:26 -0700 | [diff] [blame] | 799 | /* If we are moving from UNCONFIRMED state due |
| 800 | * to heartbeat success, report the SCTP_ADDR_CONFIRMED |
| 801 | * state to the user, otherwise report SCTP_ADDR_AVAILABLE. |
| 802 | */ |
Xin Long | 768e151 | 2019-11-08 13:20:33 +0800 | [diff] [blame] | 803 | if (transport->state == SCTP_PF && |
| 804 | asoc->pf_expose != SCTP_PF_EXPOSE_ENABLE) |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 805 | ulp_notify = false; |
Xin Long | 768e151 | 2019-11-08 13:20:33 +0800 | [diff] [blame] | 806 | else if (transport->state == SCTP_UNCONFIRMED && |
| 807 | error == SCTP_HEARTBEAT_SUCCESS) |
| 808 | spc_state = SCTP_ADDR_CONFIRMED; |
| 809 | |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 810 | transport->state = SCTP_ACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | break; |
| 812 | |
| 813 | case SCTP_TRANSPORT_DOWN: |
Vlad Yasevich | 4018788 | 2009-06-23 11:28:05 -0400 | [diff] [blame] | 814 | /* If the transport was never confirmed, do not transition it |
| 815 | * to inactive state. Also, release the cached route since |
| 816 | * there may be a better route next time. |
Vlad Yasevich | cc75689 | 2007-08-24 19:30:25 +0900 | [diff] [blame] | 817 | */ |
Xin Long | 768e151 | 2019-11-08 13:20:33 +0800 | [diff] [blame] | 818 | if (transport->state != SCTP_UNCONFIRMED) { |
Vlad Yasevich | cc75689 | 2007-08-24 19:30:25 +0900 | [diff] [blame] | 819 | transport->state = SCTP_INACTIVE; |
Xin Long | 768e151 | 2019-11-08 13:20:33 +0800 | [diff] [blame] | 820 | spc_state = SCTP_ADDR_UNREACHABLE; |
| 821 | } else { |
Julian Anastasov | c86a773 | 2017-02-06 23:14:13 +0200 | [diff] [blame] | 822 | sctp_transport_dst_release(transport); |
zhuyj | 061079a | 2014-08-20 17:31:43 +0800 | [diff] [blame] | 823 | ulp_notify = false; |
Vlad Yasevich | 4018788 | 2009-06-23 11:28:05 -0400 | [diff] [blame] | 824 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | break; |
| 826 | |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 827 | case SCTP_TRANSPORT_PF: |
| 828 | transport->state = SCTP_PF; |
Xin Long | 768e151 | 2019-11-08 13:20:33 +0800 | [diff] [blame] | 829 | if (asoc->pf_expose != SCTP_PF_EXPOSE_ENABLE) |
| 830 | ulp_notify = false; |
| 831 | else |
| 832 | spc_state = SCTP_ADDR_POTENTIALLY_FAILED; |
Neil Horman | 5aa93bc | 2012-07-21 07:56:07 +0000 | [diff] [blame] | 833 | break; |
| 834 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | default: |
| 836 | return; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 837 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 839 | /* Generate and send a SCTP_PEER_ADDR_CHANGE notification |
| 840 | * to the user. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | */ |
Xin Long | 4b77403 | 2019-10-08 19:27:33 +0800 | [diff] [blame] | 842 | if (ulp_notify) |
Jonas Falkevik | 50ce4c0 | 2020-05-27 11:59:43 +0200 | [diff] [blame] | 843 | sctp_ulpevent_notify_peer_addr_change(transport, |
Xin Long | 4b77403 | 2019-10-08 19:27:33 +0800 | [diff] [blame] | 844 | spc_state, error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
| 846 | /* Select new active and retran paths. */ |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 847 | sctp_select_active_and_retran_path(asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | } |
| 849 | |
| 850 | /* Hold a reference to an association. */ |
| 851 | void sctp_association_hold(struct sctp_association *asoc) |
| 852 | { |
Reshetova, Elena | c638457 | 2017-07-04 15:53:28 +0300 | [diff] [blame] | 853 | refcount_inc(&asoc->base.refcnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | } |
| 855 | |
| 856 | /* Release a reference to an association and cleanup |
| 857 | * if there are no more references. |
| 858 | */ |
| 859 | void sctp_association_put(struct sctp_association *asoc) |
| 860 | { |
Reshetova, Elena | c638457 | 2017-07-04 15:53:28 +0300 | [diff] [blame] | 861 | if (refcount_dec_and_test(&asoc->base.refcnt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | sctp_association_destroy(asoc); |
| 863 | } |
| 864 | |
| 865 | /* Allocate the next TSN, Transmission Sequence Number, for the given |
| 866 | * association. |
| 867 | */ |
| 868 | __u32 sctp_association_get_next_tsn(struct sctp_association *asoc) |
| 869 | { |
| 870 | /* From Section 1.6 Serial Number Arithmetic: |
| 871 | * Transmission Sequence Numbers wrap around when they reach |
| 872 | * 2**32 - 1. That is, the next TSN a DATA chunk MUST use |
| 873 | * after transmitting TSN = 2*32 - 1 is TSN = 0. |
| 874 | */ |
| 875 | __u32 retval = asoc->next_tsn; |
| 876 | asoc->next_tsn++; |
| 877 | asoc->unack_data++; |
| 878 | |
| 879 | return retval; |
| 880 | } |
| 881 | |
| 882 | /* Compare two addresses to see if they match. Wildcard addresses |
| 883 | * only match themselves. |
| 884 | */ |
| 885 | int sctp_cmp_addr_exact(const union sctp_addr *ss1, |
| 886 | const union sctp_addr *ss2) |
| 887 | { |
| 888 | struct sctp_af *af; |
| 889 | |
| 890 | af = sctp_get_af_specific(ss1->sa.sa_family); |
| 891 | if (unlikely(!af)) |
| 892 | return 0; |
| 893 | |
| 894 | return af->cmp_addr(ss1, ss2); |
| 895 | } |
| 896 | |
| 897 | /* Return an ecne chunk to get prepended to a packet. |
| 898 | * Note: We are sly and return a shared, prealloced chunk. FIXME: |
| 899 | * No we don't, but we could/should. |
| 900 | */ |
| 901 | struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc) |
| 902 | { |
wangweidong | 8b7318d | 2013-12-06 09:36:28 +0800 | [diff] [blame] | 903 | if (!asoc->need_ecne) |
| 904 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | |
| 906 | /* Send ECNE if needed. |
| 907 | * Not being able to allocate a chunk here is not deadly. |
| 908 | */ |
wangweidong | 8b7318d | 2013-12-06 09:36:28 +0800 | [diff] [blame] | 909 | return sctp_make_ecne(asoc, asoc->last_ecne_tsn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | } |
| 911 | |
| 912 | /* |
| 913 | * Find which transport this TSN was sent on. |
| 914 | */ |
| 915 | struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *asoc, |
| 916 | __u32 tsn) |
| 917 | { |
| 918 | struct sctp_transport *active; |
| 919 | struct sctp_transport *match; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | struct sctp_transport *transport; |
| 921 | struct sctp_chunk *chunk; |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 922 | __be32 key = htonl(tsn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | |
| 924 | match = NULL; |
| 925 | |
| 926 | /* |
| 927 | * FIXME: In general, find a more efficient data structure for |
| 928 | * searching. |
| 929 | */ |
| 930 | |
| 931 | /* |
| 932 | * The general strategy is to search each transport's transmitted |
| 933 | * list. Return which transport this TSN lives on. |
| 934 | * |
| 935 | * Let's be hopeful and check the active_path first. |
| 936 | * Another optimization would be to know if there is only one |
| 937 | * outbound path and not have to look for the TSN at all. |
| 938 | * |
| 939 | */ |
| 940 | |
| 941 | active = asoc->peer.active_path; |
| 942 | |
Robert P. J. Day | 9dbc15f0 | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 943 | list_for_each_entry(chunk, &active->transmitted, |
| 944 | transmitted_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | |
| 946 | if (key == chunk->subh.data_hdr->tsn) { |
| 947 | match = active; |
| 948 | goto out; |
| 949 | } |
| 950 | } |
| 951 | |
| 952 | /* If not found, go search all the other transports. */ |
Robert P. J. Day | 9dbc15f0 | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 953 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
| 954 | transports) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | |
| 956 | if (transport == active) |
Xufeng Zhang | 2317f44 | 2013-03-07 21:39:37 +0000 | [diff] [blame] | 957 | continue; |
Robert P. J. Day | 9dbc15f0 | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 958 | list_for_each_entry(chunk, &transport->transmitted, |
| 959 | transmitted_list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | if (key == chunk->subh.data_hdr->tsn) { |
| 961 | match = transport; |
| 962 | goto out; |
| 963 | } |
| 964 | } |
| 965 | } |
| 966 | out: |
| 967 | return match; |
| 968 | } |
| 969 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | /* Do delayed input processing. This is scheduled by sctp_rcv(). */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 971 | static void sctp_assoc_bh_rcv(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 973 | struct sctp_association *asoc = |
| 974 | container_of(work, struct sctp_association, |
| 975 | base.inqueue.immediate); |
Xin Long | 4e7696d | 2019-12-09 13:45:18 +0800 | [diff] [blame] | 976 | struct net *net = asoc->base.net; |
Xin Long | bfc6f82 | 2017-08-05 20:00:04 +0800 | [diff] [blame] | 977 | union sctp_subtype subtype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | struct sctp_endpoint *ep; |
| 979 | struct sctp_chunk *chunk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | struct sctp_inq *inqueue; |
Xin Long | 59d8d44 | 2018-05-05 14:59:47 +0800 | [diff] [blame] | 981 | int first_time = 1; /* is this the first time through the loop */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | int error = 0; |
Xin Long | 59d8d44 | 2018-05-05 14:59:47 +0800 | [diff] [blame] | 983 | int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
| 985 | /* The association should be held so we should be safe. */ |
| 986 | ep = asoc->ep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | |
| 988 | inqueue = &asoc->base.inqueue; |
| 989 | sctp_association_hold(asoc); |
| 990 | while (NULL != (chunk = sctp_inq_pop(inqueue))) { |
| 991 | state = asoc->state; |
| 992 | subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type); |
| 993 | |
Xin Long | 59d8d44 | 2018-05-05 14:59:47 +0800 | [diff] [blame] | 994 | /* If the first chunk in the packet is AUTH, do special |
| 995 | * processing specified in Section 6.3 of SCTP-AUTH spec |
| 996 | */ |
| 997 | if (first_time && subtype.chunk == SCTP_CID_AUTH) { |
| 998 | struct sctp_chunkhdr *next_hdr; |
| 999 | |
| 1000 | next_hdr = sctp_inq_peek(inqueue); |
| 1001 | if (!next_hdr) |
| 1002 | goto normal; |
| 1003 | |
| 1004 | /* If the next chunk is COOKIE-ECHO, skip the AUTH |
| 1005 | * chunk while saving a pointer to it so we can do |
| 1006 | * Authentication later (during cookie-echo |
| 1007 | * processing). |
| 1008 | */ |
| 1009 | if (next_hdr->type == SCTP_CID_COOKIE_ECHO) { |
| 1010 | chunk->auth_chunk = skb_clone(chunk->skb, |
| 1011 | GFP_ATOMIC); |
| 1012 | chunk->auth = 1; |
| 1013 | continue; |
| 1014 | } |
| 1015 | } |
| 1016 | |
| 1017 | normal: |
Vlad Yasevich | bbd0d59 | 2007-10-03 17:51:34 -0700 | [diff] [blame] | 1018 | /* SCTP-AUTH, Section 6.3: |
| 1019 | * The receiver has a list of chunk types which it expects |
| 1020 | * to be received only after an AUTH-chunk. This list has |
| 1021 | * been sent to the peer during the association setup. It |
| 1022 | * MUST silently discard these chunks if they are not placed |
| 1023 | * after an AUTH chunk in the packet. |
| 1024 | */ |
| 1025 | if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth) |
| 1026 | continue; |
| 1027 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | /* Remember where the last DATA chunk came from so we |
| 1029 | * know where to send the SACK. |
| 1030 | */ |
| 1031 | if (sctp_chunk_is_data(chunk)) |
| 1032 | asoc->peer.last_data_from = chunk->transport; |
Michele Baldessari | 196d675 | 2012-12-01 04:49:42 +0000 | [diff] [blame] | 1033 | else { |
Eric W. Biederman | 55e26eb | 2012-08-07 07:25:24 +0000 | [diff] [blame] | 1034 | SCTP_INC_STATS(net, SCTP_MIB_INCTRLCHUNKS); |
Michele Baldessari | 196d675 | 2012-12-01 04:49:42 +0000 | [diff] [blame] | 1035 | asoc->stats.ictrlchunks++; |
| 1036 | if (chunk->chunk_hdr->type == SCTP_CID_SACK) |
| 1037 | asoc->stats.isacks++; |
| 1038 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | |
| 1040 | if (chunk->transport) |
Daniel Borkmann | e575235 | 2014-06-11 18:19:30 +0200 | [diff] [blame] | 1041 | chunk->transport->last_time_heard = ktime_get(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | |
| 1043 | /* Run through the state machine. */ |
Eric W. Biederman | 55e26eb | 2012-08-07 07:25:24 +0000 | [diff] [blame] | 1044 | error = sctp_do_sm(net, SCTP_EVENT_T_CHUNK, subtype, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | state, ep, asoc, chunk, GFP_ATOMIC); |
| 1046 | |
| 1047 | /* Check to see if the association is freed in response to |
| 1048 | * the incoming chunk. If so, get out of the while loop. |
| 1049 | */ |
| 1050 | if (asoc->base.dead) |
| 1051 | break; |
| 1052 | |
| 1053 | /* If there is an error on chunk, discard this packet. */ |
| 1054 | if (error && chunk) |
| 1055 | chunk->pdiscard = 1; |
Xin Long | 59d8d44 | 2018-05-05 14:59:47 +0800 | [diff] [blame] | 1056 | |
| 1057 | if (first_time) |
| 1058 | first_time = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | } |
| 1060 | sctp_association_put(asoc); |
| 1061 | } |
| 1062 | |
| 1063 | /* This routine moves an association from its old sk to a new sk. */ |
| 1064 | void sctp_assoc_migrate(struct sctp_association *assoc, struct sock *newsk) |
| 1065 | { |
| 1066 | struct sctp_sock *newsp = sctp_sk(newsk); |
| 1067 | struct sock *oldsk = assoc->base.sk; |
| 1068 | |
| 1069 | /* Delete the association from the old endpoint's list of |
| 1070 | * associations. |
| 1071 | */ |
| 1072 | list_del_init(&assoc->asocs); |
| 1073 | |
| 1074 | /* Decrement the backlog value for a TCP-style socket. */ |
| 1075 | if (sctp_style(oldsk, TCP)) |
Eric Dumazet | 7976a11 | 2019-11-05 14:11:52 -0800 | [diff] [blame] | 1076 | sk_acceptq_removed(oldsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | |
| 1078 | /* Release references to the old endpoint and the sock. */ |
| 1079 | sctp_endpoint_put(assoc->ep); |
| 1080 | sock_put(assoc->base.sk); |
| 1081 | |
| 1082 | /* Get a reference to the new endpoint. */ |
| 1083 | assoc->ep = newsp->ep; |
| 1084 | sctp_endpoint_hold(assoc->ep); |
| 1085 | |
| 1086 | /* Get a reference to the new sock. */ |
| 1087 | assoc->base.sk = newsk; |
| 1088 | sock_hold(assoc->base.sk); |
| 1089 | |
| 1090 | /* Add the association to the new endpoint's list of associations. */ |
| 1091 | sctp_endpoint_add_asoc(newsp->ep, assoc); |
| 1092 | } |
| 1093 | |
| 1094 | /* Update an association (possibly from unexpected COOKIE-ECHO processing). */ |
Xin Long | 5ee8aa6 | 2017-06-20 16:05:11 +0800 | [diff] [blame] | 1095 | int sctp_assoc_update(struct sctp_association *asoc, |
| 1096 | struct sctp_association *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | { |
| 1098 | struct sctp_transport *trans; |
| 1099 | struct list_head *pos, *temp; |
| 1100 | |
| 1101 | /* Copy in new parameters of peer. */ |
| 1102 | asoc->c = new->c; |
| 1103 | asoc->peer.rwnd = new->peer.rwnd; |
| 1104 | asoc->peer.sack_needed = new->peer.sack_needed; |
Daniel Borkmann | 1be9a95 | 2014-07-22 15:22:45 +0200 | [diff] [blame] | 1105 | asoc->peer.auth_capable = new->peer.auth_capable; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | asoc->peer.i = new->peer.i; |
Xin Long | 5ee8aa6 | 2017-06-20 16:05:11 +0800 | [diff] [blame] | 1107 | |
| 1108 | if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, |
| 1109 | asoc->peer.i.initial_tsn, GFP_ATOMIC)) |
| 1110 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | |
| 1112 | /* Remove any peer addresses not present in the new association. */ |
| 1113 | list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { |
| 1114 | trans = list_entry(pos, struct sctp_transport, transports); |
Vlad Yasevich | 0c42749 | 2010-04-28 08:47:19 +0000 | [diff] [blame] | 1115 | if (!sctp_assoc_lookup_paddr(new, &trans->ipaddr)) { |
| 1116 | sctp_assoc_rm_peer(asoc, trans); |
| 1117 | continue; |
| 1118 | } |
Vlad Yasevich | 749bf92 | 2007-03-19 17:02:30 -0700 | [diff] [blame] | 1119 | |
| 1120 | if (asoc->state >= SCTP_STATE_ESTABLISHED) |
| 1121 | sctp_transport_reset(trans); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | } |
| 1123 | |
| 1124 | /* If the case is A (association restart), use |
| 1125 | * initial_tsn as next_tsn. If the case is B, use |
| 1126 | * current next_tsn in case data sent to peer |
| 1127 | * has been discarded and needs retransmission. |
| 1128 | */ |
| 1129 | if (asoc->state >= SCTP_STATE_ESTABLISHED) { |
| 1130 | asoc->next_tsn = new->next_tsn; |
| 1131 | asoc->ctsn_ack_point = new->ctsn_ack_point; |
| 1132 | asoc->adv_peer_ack_point = new->adv_peer_ack_point; |
| 1133 | |
| 1134 | /* Reinitialize SSN for both local streams |
| 1135 | * and peer's streams. |
| 1136 | */ |
Xin Long | cee360a | 2017-05-31 16:36:31 +0800 | [diff] [blame] | 1137 | sctp_stream_clear(&asoc->stream); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | |
Vlad Yasevich | 0b58a81 | 2007-03-19 17:01:17 -0700 | [diff] [blame] | 1139 | /* Flush the ULP reassembly and ordered queue. |
| 1140 | * Any data there will now be stale and will |
| 1141 | * cause problems. |
| 1142 | */ |
| 1143 | sctp_ulpq_flush(&asoc->ulpq); |
| 1144 | |
Vlad Yasevich | 749bf92 | 2007-03-19 17:02:30 -0700 | [diff] [blame] | 1145 | /* reset the overall association error count so |
| 1146 | * that the restarted association doesn't get torn |
| 1147 | * down on the next retransmission timer. |
| 1148 | */ |
| 1149 | asoc->overall_error_count = 0; |
| 1150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | } else { |
| 1152 | /* Add any peer addresses from the new association. */ |
Robert P. J. Day | 9dbc15f0 | 2008-04-12 18:54:24 -0700 | [diff] [blame] | 1153 | list_for_each_entry(trans, &new->peer.transport_addr_list, |
Xin Long | 5ee8aa6 | 2017-06-20 16:05:11 +0800 | [diff] [blame] | 1154 | transports) |
| 1155 | if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr) && |
| 1156 | !sctp_assoc_add_peer(asoc, &trans->ipaddr, |
| 1157 | GFP_ATOMIC, trans->state)) |
| 1158 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | |
| 1160 | asoc->ctsn_ack_point = asoc->next_tsn - 1; |
| 1161 | asoc->adv_peer_ack_point = asoc->ctsn_ack_point; |
Xin Long | 3ab2137 | 2017-05-23 13:28:54 +0800 | [diff] [blame] | 1162 | |
Xin Long | cee360a | 2017-05-31 16:36:31 +0800 | [diff] [blame] | 1163 | if (sctp_state(asoc, COOKIE_WAIT)) |
| 1164 | sctp_stream_update(&asoc->stream, &new->stream); |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1165 | |
Xin Long | 4abf5a6 | 2017-06-10 15:27:12 +0800 | [diff] [blame] | 1166 | /* get a new assoc id if we don't have one yet. */ |
Xin Long | 5ee8aa6 | 2017-06-20 16:05:11 +0800 | [diff] [blame] | 1167 | if (sctp_assoc_set_id(asoc, GFP_ATOMIC)) |
| 1168 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | } |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 1170 | |
wangweidong | 9d2c881 | 2013-12-06 09:36:30 +0800 | [diff] [blame] | 1171 | /* SCTP-AUTH: Save the peer parameters from the new associations |
Vlad Yasevich | 730fc3d | 2007-09-16 19:32:11 -0700 | [diff] [blame] | 1172 | * and also move the association shared keys over |
| 1173 | */ |
| 1174 | kfree(asoc->peer.peer_random); |
| 1175 | asoc->peer.peer_random = new->peer.peer_random; |
| 1176 | new->peer.peer_random = NULL; |
| 1177 | |
| 1178 | kfree(asoc->peer.peer_chunks); |
| 1179 | asoc->peer.peer_chunks = new->peer.peer_chunks; |
| 1180 | new->peer.peer_chunks = NULL; |
| 1181 | |
| 1182 | kfree(asoc->peer.peer_hmacs); |
| 1183 | asoc->peer.peer_hmacs = new->peer.peer_hmacs; |
| 1184 | new->peer.peer_hmacs = NULL; |
| 1185 | |
Xin Long | 5ee8aa6 | 2017-06-20 16:05:11 +0800 | [diff] [blame] | 1186 | return sctp_auth_asoc_init_active_key(asoc, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | } |
| 1188 | |
| 1189 | /* Update the retran path for sending a retransmitted packet. |
Daniel Borkmann | 4c47af4 | 2014-02-20 20:51:06 +0100 | [diff] [blame] | 1190 | * See also RFC4960, 6.4. Multi-Homed SCTP Endpoints: |
| 1191 | * |
| 1192 | * When there is outbound data to send and the primary path |
| 1193 | * becomes inactive (e.g., due to failures), or where the |
| 1194 | * SCTP user explicitly requests to send data to an |
| 1195 | * inactive destination transport address, before reporting |
| 1196 | * an error to its ULP, the SCTP endpoint should try to send |
| 1197 | * the data to an alternate active destination transport |
| 1198 | * address if one exists. |
| 1199 | * |
| 1200 | * When retransmitting data that timed out, if the endpoint |
| 1201 | * is multihomed, it should consider each source-destination |
| 1202 | * address pair in its retransmission selection policy. |
| 1203 | * When retransmitting timed-out data, the endpoint should |
| 1204 | * attempt to pick the most divergent source-destination |
| 1205 | * pair from the original source-destination pair to which |
| 1206 | * the packet was transmitted. |
| 1207 | * |
| 1208 | * Note: Rules for picking the most divergent source-destination |
| 1209 | * pair are an implementation decision and are not specified |
| 1210 | * within this document. |
| 1211 | * |
| 1212 | * Our basic strategy is to round-robin transports in priorities |
Denys Vlasenko | 2103d6b | 2015-09-28 14:34:04 +0200 | [diff] [blame] | 1213 | * according to sctp_trans_score() e.g., if no such |
Daniel Borkmann | 4c47af4 | 2014-02-20 20:51:06 +0100 | [diff] [blame] | 1214 | * transport with state SCTP_ACTIVE exists, round-robin through |
| 1215 | * SCTP_UNKNOWN, etc. You get the picture. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | */ |
Daniel Borkmann | 4c47af4 | 2014-02-20 20:51:06 +0100 | [diff] [blame] | 1217 | static u8 sctp_trans_score(const struct sctp_transport *trans) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | { |
Denys Vlasenko | 2103d6b | 2015-09-28 14:34:04 +0200 | [diff] [blame] | 1219 | switch (trans->state) { |
| 1220 | case SCTP_ACTIVE: |
| 1221 | return 3; /* best case */ |
| 1222 | case SCTP_UNKNOWN: |
| 1223 | return 2; |
| 1224 | case SCTP_PF: |
| 1225 | return 1; |
| 1226 | default: /* case SCTP_INACTIVE */ |
| 1227 | return 0; /* worst case */ |
| 1228 | } |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1229 | } |
| 1230 | |
Daniel Borkmann | a7288c4 | 2014-06-11 18:19:31 +0200 | [diff] [blame] | 1231 | static struct sctp_transport *sctp_trans_elect_tie(struct sctp_transport *trans1, |
| 1232 | struct sctp_transport *trans2) |
| 1233 | { |
| 1234 | if (trans1->error_count > trans2->error_count) { |
| 1235 | return trans2; |
| 1236 | } else if (trans1->error_count == trans2->error_count && |
| 1237 | ktime_after(trans2->last_time_heard, |
| 1238 | trans1->last_time_heard)) { |
| 1239 | return trans2; |
| 1240 | } else { |
| 1241 | return trans1; |
| 1242 | } |
| 1243 | } |
| 1244 | |
Daniel Borkmann | 4c47af4 | 2014-02-20 20:51:06 +0100 | [diff] [blame] | 1245 | static struct sctp_transport *sctp_trans_elect_best(struct sctp_transport *curr, |
| 1246 | struct sctp_transport *best) |
| 1247 | { |
Daniel Borkmann | a7288c4 | 2014-06-11 18:19:31 +0200 | [diff] [blame] | 1248 | u8 score_curr, score_best; |
| 1249 | |
Daniel Borkmann | ea4f19c | 2014-08-22 13:03:29 +0200 | [diff] [blame] | 1250 | if (best == NULL || curr == best) |
Daniel Borkmann | 4c47af4 | 2014-02-20 20:51:06 +0100 | [diff] [blame] | 1251 | return curr; |
| 1252 | |
Daniel Borkmann | a7288c4 | 2014-06-11 18:19:31 +0200 | [diff] [blame] | 1253 | score_curr = sctp_trans_score(curr); |
| 1254 | score_best = sctp_trans_score(best); |
| 1255 | |
| 1256 | /* First, try a score-based selection if both transport states |
| 1257 | * differ. If we're in a tie, lets try to make a more clever |
| 1258 | * decision here based on error counts and last time heard. |
| 1259 | */ |
| 1260 | if (score_curr > score_best) |
| 1261 | return curr; |
| 1262 | else if (score_curr == score_best) |
Xin Long | 39d2ade | 2016-03-10 15:31:57 +0800 | [diff] [blame] | 1263 | return sctp_trans_elect_tie(best, curr); |
Daniel Borkmann | a7288c4 | 2014-06-11 18:19:31 +0200 | [diff] [blame] | 1264 | else |
| 1265 | return best; |
Daniel Borkmann | 4c47af4 | 2014-02-20 20:51:06 +0100 | [diff] [blame] | 1266 | } |
| 1267 | |
| 1268 | void sctp_assoc_update_retran_path(struct sctp_association *asoc) |
| 1269 | { |
| 1270 | struct sctp_transport *trans = asoc->peer.retran_path; |
| 1271 | struct sctp_transport *trans_next = NULL; |
| 1272 | |
| 1273 | /* We're done as we only have the one and only path. */ |
| 1274 | if (asoc->peer.transport_count == 1) |
| 1275 | return; |
| 1276 | /* If active_path and retran_path are the same and active, |
| 1277 | * then this is the only active path. Use it. |
| 1278 | */ |
| 1279 | if (asoc->peer.active_path == asoc->peer.retran_path && |
| 1280 | asoc->peer.active_path->state == SCTP_ACTIVE) |
| 1281 | return; |
| 1282 | |
| 1283 | /* Iterate from retran_path's successor back to retran_path. */ |
| 1284 | for (trans = list_next_entry(trans, transports); 1; |
| 1285 | trans = list_next_entry(trans, transports)) { |
| 1286 | /* Manually skip the head element. */ |
| 1287 | if (&trans->transports == &asoc->peer.transport_addr_list) |
| 1288 | continue; |
| 1289 | if (trans->state == SCTP_UNCONFIRMED) |
| 1290 | continue; |
| 1291 | trans_next = sctp_trans_elect_best(trans, trans_next); |
| 1292 | /* Active is good enough for immediate return. */ |
| 1293 | if (trans_next->state == SCTP_ACTIVE) |
| 1294 | break; |
| 1295 | /* We've reached the end, time to update path. */ |
| 1296 | if (trans == asoc->peer.retran_path) |
| 1297 | break; |
| 1298 | } |
| 1299 | |
Daniel Borkmann | 433131b | 2014-03-13 14:45:26 +0100 | [diff] [blame] | 1300 | asoc->peer.retran_path = trans_next; |
Daniel Borkmann | 4c47af4 | 2014-02-20 20:51:06 +0100 | [diff] [blame] | 1301 | |
| 1302 | pr_debug("%s: association:%p updated new path to addr:%pISpc\n", |
| 1303 | __func__, asoc, &asoc->peer.retran_path->ipaddr.sa); |
| 1304 | } |
| 1305 | |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 1306 | static void sctp_select_active_and_retran_path(struct sctp_association *asoc) |
| 1307 | { |
| 1308 | struct sctp_transport *trans, *trans_pri = NULL, *trans_sec = NULL; |
Daniel Borkmann | a7288c4 | 2014-06-11 18:19:31 +0200 | [diff] [blame] | 1309 | struct sctp_transport *trans_pf = NULL; |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 1310 | |
| 1311 | /* Look for the two most recently used active transports. */ |
| 1312 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
| 1313 | transports) { |
Daniel Borkmann | a7288c4 | 2014-06-11 18:19:31 +0200 | [diff] [blame] | 1314 | /* Skip uninteresting transports. */ |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 1315 | if (trans->state == SCTP_INACTIVE || |
Daniel Borkmann | a7288c4 | 2014-06-11 18:19:31 +0200 | [diff] [blame] | 1316 | trans->state == SCTP_UNCONFIRMED) |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 1317 | continue; |
Daniel Borkmann | a7288c4 | 2014-06-11 18:19:31 +0200 | [diff] [blame] | 1318 | /* Keep track of the best PF transport from our |
| 1319 | * list in case we don't find an active one. |
| 1320 | */ |
| 1321 | if (trans->state == SCTP_PF) { |
| 1322 | trans_pf = sctp_trans_elect_best(trans, trans_pf); |
| 1323 | continue; |
| 1324 | } |
| 1325 | /* For active transports, pick the most recent ones. */ |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 1326 | if (trans_pri == NULL || |
Daniel Borkmann | e575235 | 2014-06-11 18:19:30 +0200 | [diff] [blame] | 1327 | ktime_after(trans->last_time_heard, |
| 1328 | trans_pri->last_time_heard)) { |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 1329 | trans_sec = trans_pri; |
| 1330 | trans_pri = trans; |
| 1331 | } else if (trans_sec == NULL || |
Daniel Borkmann | e575235 | 2014-06-11 18:19:30 +0200 | [diff] [blame] | 1332 | ktime_after(trans->last_time_heard, |
| 1333 | trans_sec->last_time_heard)) { |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 1334 | trans_sec = trans; |
| 1335 | } |
| 1336 | } |
| 1337 | |
| 1338 | /* RFC 2960 6.4 Multi-Homed SCTP Endpoints |
| 1339 | * |
| 1340 | * By default, an endpoint should always transmit to the primary |
| 1341 | * path, unless the SCTP user explicitly specifies the |
| 1342 | * destination transport address (and possibly source transport |
| 1343 | * address) to use. [If the primary is active but not most recent, |
| 1344 | * bump the most recently used transport.] |
| 1345 | */ |
| 1346 | if ((asoc->peer.primary_path->state == SCTP_ACTIVE || |
| 1347 | asoc->peer.primary_path->state == SCTP_UNKNOWN) && |
| 1348 | asoc->peer.primary_path != trans_pri) { |
| 1349 | trans_sec = trans_pri; |
| 1350 | trans_pri = asoc->peer.primary_path; |
| 1351 | } |
| 1352 | |
| 1353 | /* We did not find anything useful for a possible retransmission |
| 1354 | * path; either primary path that we found is the the same as |
| 1355 | * the current one, or we didn't generally find an active one. |
| 1356 | */ |
| 1357 | if (trans_sec == NULL) |
| 1358 | trans_sec = trans_pri; |
| 1359 | |
| 1360 | /* If we failed to find a usable transport, just camp on the |
Daniel Borkmann | aa4a83e | 2014-08-22 13:03:30 +0200 | [diff] [blame] | 1361 | * active or pick a PF iff it's the better choice. |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 1362 | */ |
| 1363 | if (trans_pri == NULL) { |
Daniel Borkmann | aa4a83e | 2014-08-22 13:03:30 +0200 | [diff] [blame] | 1364 | trans_pri = sctp_trans_elect_best(asoc->peer.active_path, trans_pf); |
| 1365 | trans_sec = trans_pri; |
Daniel Borkmann | b82e8f3 | 2014-06-11 18:19:29 +0200 | [diff] [blame] | 1366 | } |
| 1367 | |
| 1368 | /* Set the active and retran transports. */ |
| 1369 | asoc->peer.active_path = trans_pri; |
| 1370 | asoc->peer.retran_path = trans_sec; |
| 1371 | } |
| 1372 | |
Daniel Borkmann | 4c47af4 | 2014-02-20 20:51:06 +0100 | [diff] [blame] | 1373 | struct sctp_transport * |
| 1374 | sctp_assoc_choose_alter_transport(struct sctp_association *asoc, |
| 1375 | struct sctp_transport *last_sent_to) |
Frank Filz | 3f7a87d | 2005-06-20 13:14:57 -0700 | [diff] [blame] | 1376 | { |
Wei Yongjun | 9919b45 | 2009-05-12 21:52:51 +0800 | [diff] [blame] | 1377 | /* If this is the first time packet is sent, use the active path, |
| 1378 | * 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] | 1379 | * retran path, update the retran path and use it. |
| 1380 | */ |
Daniel Borkmann | 4c47af4 | 2014-02-20 20:51:06 +0100 | [diff] [blame] | 1381 | if (last_sent_to == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | return asoc->peer.active_path; |
Daniel Borkmann | 4c47af4 | 2014-02-20 20:51:06 +0100 | [diff] [blame] | 1383 | } else { |
Wei Yongjun | 9919b45 | 2009-05-12 21:52:51 +0800 | [diff] [blame] | 1384 | if (last_sent_to == asoc->peer.retran_path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | sctp_assoc_update_retran_path(asoc); |
Daniel Borkmann | 4c47af4 | 2014-02-20 20:51:06 +0100 | [diff] [blame] | 1386 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | return asoc->peer.retran_path; |
| 1388 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | } |
| 1390 | |
Marcelo Ricardo Leitner | 2f5e3c9 | 2018-04-26 16:58:55 -0300 | [diff] [blame] | 1391 | void sctp_assoc_update_frag_point(struct sctp_association *asoc) |
| 1392 | { |
| 1393 | int frag = sctp_mtu_payload(sctp_sk(asoc->base.sk), asoc->pathmtu, |
| 1394 | sctp_datachk_len(&asoc->stream)); |
| 1395 | |
| 1396 | if (asoc->user_frag) |
| 1397 | frag = min_t(int, frag, asoc->user_frag); |
| 1398 | |
| 1399 | frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN - |
| 1400 | sctp_datachk_len(&asoc->stream)); |
| 1401 | |
| 1402 | asoc->frag_point = SCTP_TRUNC4(frag); |
| 1403 | } |
| 1404 | |
Marcelo Ricardo Leitner | c4b2893 | 2018-04-26 16:58:53 -0300 | [diff] [blame] | 1405 | void sctp_assoc_set_pmtu(struct sctp_association *asoc, __u32 pmtu) |
| 1406 | { |
Marcelo Ricardo Leitner | 2f5e3c9 | 2018-04-26 16:58:55 -0300 | [diff] [blame] | 1407 | if (asoc->pathmtu != pmtu) { |
Marcelo Ricardo Leitner | c4b2893 | 2018-04-26 16:58:53 -0300 | [diff] [blame] | 1408 | asoc->pathmtu = pmtu; |
Marcelo Ricardo Leitner | 2f5e3c9 | 2018-04-26 16:58:55 -0300 | [diff] [blame] | 1409 | sctp_assoc_update_frag_point(asoc); |
| 1410 | } |
Marcelo Ricardo Leitner | c4b2893 | 2018-04-26 16:58:53 -0300 | [diff] [blame] | 1411 | |
| 1412 | pr_debug("%s: asoc:%p, pmtu:%d, frag_point:%d\n", __func__, asoc, |
| 1413 | asoc->pathmtu, asoc->frag_point); |
| 1414 | } |
| 1415 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | /* Update the association's pmtu and frag_point by going through all the |
| 1417 | * transports. This routine is called when a transport's PMTU has changed. |
| 1418 | */ |
Xin Long | 3ebfdf0 | 2017-04-04 13:39:55 +0800 | [diff] [blame] | 1419 | void sctp_assoc_sync_pmtu(struct sctp_association *asoc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | { |
| 1421 | struct sctp_transport *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | __u32 pmtu = 0; |
| 1423 | |
| 1424 | if (!asoc) |
| 1425 | return; |
| 1426 | |
| 1427 | /* Get the lowest pmtu of all the transports. */ |
Marcelo Ricardo Leitner | 6ff0f87 | 2018-04-26 16:58:57 -0300 | [diff] [blame] | 1428 | list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) { |
Vlad Yasevich | 8a47949 | 2007-06-07 14:21:05 -0400 | [diff] [blame] | 1429 | if (t->pmtu_pending && t->dst) { |
Xin Long | d805397 | 2018-10-15 19:58:29 +0800 | [diff] [blame] | 1430 | sctp_transport_update_pmtu(t, |
| 1431 | atomic_read(&t->mtu_info)); |
Vlad Yasevich | 8a47949 | 2007-06-07 14:21:05 -0400 | [diff] [blame] | 1432 | t->pmtu_pending = 0; |
| 1433 | } |
Frank Filz | 52ccb8e | 2005-12-22 11:36:46 -0800 | [diff] [blame] | 1434 | if (!pmtu || (t->pathmtu < pmtu)) |
| 1435 | pmtu = t->pathmtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | } |
| 1437 | |
Marcelo Ricardo Leitner | c4b2893 | 2018-04-26 16:58:53 -0300 | [diff] [blame] | 1438 | sctp_assoc_set_pmtu(asoc, pmtu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | } |
| 1440 | |
| 1441 | /* Should we send a SACK to update our peer? */ |
wangweidong | ce4a03d | 2013-12-06 09:36:29 +0800 | [diff] [blame] | 1442 | static inline bool sctp_peer_needs_update(struct sctp_association *asoc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | { |
Xin Long | 4e7696d | 2019-12-09 13:45:18 +0800 | [diff] [blame] | 1444 | struct net *net = asoc->base.net; |
| 1445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | switch (asoc->state) { |
| 1447 | case SCTP_STATE_ESTABLISHED: |
| 1448 | case SCTP_STATE_SHUTDOWN_PENDING: |
| 1449 | case SCTP_STATE_SHUTDOWN_RECEIVED: |
| 1450 | case SCTP_STATE_SHUTDOWN_SENT: |
| 1451 | if ((asoc->rwnd > asoc->a_rwnd) && |
Vlad Yasevich | 90f2f53 | 2009-11-23 15:53:57 -0500 | [diff] [blame] | 1452 | ((asoc->rwnd - asoc->a_rwnd) >= max_t(__u32, |
Eric W. Biederman | e1fc3b1 | 2012-08-07 07:29:57 +0000 | [diff] [blame] | 1453 | (asoc->base.sk->sk_rcvbuf >> net->sctp.rwnd_upd_shift), |
Vlad Yasevich | 90f2f53 | 2009-11-23 15:53:57 -0500 | [diff] [blame] | 1454 | asoc->pathmtu))) |
wangweidong | ce4a03d | 2013-12-06 09:36:29 +0800 | [diff] [blame] | 1455 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | break; |
| 1457 | default: |
| 1458 | break; |
| 1459 | } |
wangweidong | ce4a03d | 2013-12-06 09:36:29 +0800 | [diff] [blame] | 1460 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | } |
| 1462 | |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 1463 | /* Increase asoc's rwnd by len and send any window update SACK if needed. */ |
| 1464 | void sctp_assoc_rwnd_increase(struct sctp_association *asoc, unsigned int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | { |
| 1466 | struct sctp_chunk *sack; |
| 1467 | struct timer_list *timer; |
| 1468 | |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 1469 | if (asoc->rwnd_over) { |
| 1470 | if (asoc->rwnd_over >= len) { |
| 1471 | asoc->rwnd_over -= len; |
| 1472 | } else { |
| 1473 | asoc->rwnd += (len - asoc->rwnd_over); |
| 1474 | asoc->rwnd_over = 0; |
| 1475 | } |
| 1476 | } else { |
| 1477 | asoc->rwnd += len; |
| 1478 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 1480 | /* If we had window pressure, start recovering it |
| 1481 | * once our rwnd had reached the accumulated pressure |
| 1482 | * threshold. The idea is to recover slowly, but up |
| 1483 | * to the initial advertised window. |
| 1484 | */ |
Marcelo Ricardo Leitner | 1636098 | 2016-12-23 14:29:37 -0200 | [diff] [blame] | 1485 | if (asoc->rwnd_press) { |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 1486 | int change = min(asoc->pathmtu, asoc->rwnd_press); |
| 1487 | asoc->rwnd += change; |
| 1488 | asoc->rwnd_press -= change; |
| 1489 | } |
Vlad Yasevich | 4d3c46e | 2009-09-04 18:20:59 -0400 | [diff] [blame] | 1490 | |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 1491 | pr_debug("%s: asoc:%p rwnd increased by %d to (%u, %u) - %u\n", |
| 1492 | __func__, asoc, len, asoc->rwnd, asoc->rwnd_over, |
| 1493 | asoc->a_rwnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | |
| 1495 | /* Send a window update SACK if the rwnd has increased by at least the |
| 1496 | * minimum of the association's PMTU and half of the receive buffer. |
| 1497 | * The algorithm used is similar to the one described in |
| 1498 | * Section 4.2.3.3 of RFC 1122. |
| 1499 | */ |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 1500 | if (sctp_peer_needs_update(asoc)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | asoc->a_rwnd = asoc->rwnd; |
Daniel Borkmann | bb33381 | 2013-06-28 19:49:40 +0200 | [diff] [blame] | 1502 | |
| 1503 | pr_debug("%s: sending window update SACK- asoc:%p rwnd:%u " |
| 1504 | "a_rwnd:%u\n", __func__, asoc, asoc->rwnd, |
| 1505 | asoc->a_rwnd); |
| 1506 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | sack = sctp_make_sack(asoc); |
| 1508 | if (!sack) |
| 1509 | return; |
| 1510 | |
| 1511 | asoc->peer.sack_needed = 0; |
| 1512 | |
Marcelo Ricardo Leitner | cea8768 | 2016-03-10 18:33:07 -0300 | [diff] [blame] | 1513 | sctp_outq_tail(&asoc->outqueue, sack, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | |
| 1515 | /* Stop the SACK timer. */ |
| 1516 | timer = &asoc->timers[SCTP_EVENT_TIMEOUT_SACK]; |
Ying Xue | 25cc4ae9 | 2013-02-03 20:32:57 +0000 | [diff] [blame] | 1517 | if (del_timer(timer)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | sctp_association_put(asoc); |
| 1519 | } |
| 1520 | } |
| 1521 | |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 1522 | /* Decrease asoc's rwnd by len. */ |
| 1523 | void sctp_assoc_rwnd_decrease(struct sctp_association *asoc, unsigned int len) |
| 1524 | { |
| 1525 | int rx_count; |
| 1526 | int over = 0; |
| 1527 | |
| 1528 | if (unlikely(!asoc->rwnd || asoc->rwnd_over)) |
| 1529 | pr_debug("%s: association:%p has asoc->rwnd:%u, " |
| 1530 | "asoc->rwnd_over:%u!\n", __func__, asoc, |
| 1531 | asoc->rwnd, asoc->rwnd_over); |
| 1532 | |
| 1533 | if (asoc->ep->rcvbuf_policy) |
| 1534 | rx_count = atomic_read(&asoc->rmem_alloc); |
| 1535 | else |
| 1536 | rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc); |
| 1537 | |
| 1538 | /* If we've reached or overflowed our receive buffer, announce |
| 1539 | * a 0 rwnd if rwnd would still be positive. Store the |
| 1540 | * the potential pressure overflow so that the window can be restored |
| 1541 | * back to original value. |
| 1542 | */ |
| 1543 | if (rx_count >= asoc->base.sk->sk_rcvbuf) |
| 1544 | over = 1; |
| 1545 | |
| 1546 | if (asoc->rwnd >= len) { |
| 1547 | asoc->rwnd -= len; |
| 1548 | if (over) { |
| 1549 | asoc->rwnd_press += asoc->rwnd; |
| 1550 | asoc->rwnd = 0; |
| 1551 | } |
| 1552 | } else { |
Marcelo Ricardo Leitner | 58b94d8 | 2016-12-23 14:29:02 -0200 | [diff] [blame] | 1553 | asoc->rwnd_over += len - asoc->rwnd; |
Daniel Borkmann | 362d520 | 2014-04-14 21:45:17 +0200 | [diff] [blame] | 1554 | asoc->rwnd = 0; |
| 1555 | } |
| 1556 | |
| 1557 | pr_debug("%s: asoc:%p rwnd decreased by %d to (%u, %u, %u)\n", |
| 1558 | __func__, asoc, len, asoc->rwnd, asoc->rwnd_over, |
| 1559 | asoc->rwnd_press); |
| 1560 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | |
| 1562 | /* Build the bind address list for the association based on info from the |
| 1563 | * local endpoint and the remote peer. |
| 1564 | */ |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1565 | int sctp_assoc_set_bind_addr_from_ep(struct sctp_association *asoc, |
Xin Long | 1c66201 | 2017-08-05 19:59:54 +0800 | [diff] [blame] | 1566 | enum sctp_scope scope, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | int flags; |
| 1569 | |
| 1570 | /* Use scoping rules to determine the subset of addresses from |
| 1571 | * the endpoint. |
| 1572 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | flags = (PF_INET6 == asoc->base.sk->sk_family) ? SCTP_ADDR6_ALLOWED : 0; |
| 1574 | if (asoc->peer.ipv4_address) |
| 1575 | flags |= SCTP_ADDR4_PEERSUPP; |
| 1576 | if (asoc->peer.ipv6_address) |
| 1577 | flags |= SCTP_ADDR6_PEERSUPP; |
| 1578 | |
Xin Long | 4e7696d | 2019-12-09 13:45:18 +0800 | [diff] [blame] | 1579 | return sctp_bind_addr_copy(asoc->base.net, |
Eric W. Biederman | 4db67e8 | 2012-08-06 08:42:04 +0000 | [diff] [blame] | 1580 | &asoc->base.bind_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | &asoc->ep->base.bind_addr, |
| 1582 | scope, gfp, flags); |
| 1583 | } |
| 1584 | |
| 1585 | /* Build the association's bind address list from the cookie. */ |
| 1586 | int sctp_assoc_set_bind_addr_from_cookie(struct sctp_association *asoc, |
Alexey Dobriyan | 3182cd8 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 1587 | struct sctp_cookie *cookie, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1588 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | { |
| 1590 | int var_size2 = ntohs(cookie->peer_init->chunk_hdr.length); |
| 1591 | int var_size3 = cookie->raw_addr_list_len; |
| 1592 | __u8 *raw = (__u8 *)cookie->peer_init + var_size2; |
| 1593 | |
| 1594 | return sctp_raw_to_bind_addrs(&asoc->base.bind_addr, raw, var_size3, |
| 1595 | asoc->ep->base.bind_addr.port, gfp); |
| 1596 | } |
| 1597 | |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 1598 | /* Lookup laddr in the bind address list of an association. */ |
| 1599 | int sctp_assoc_lookup_laddr(struct sctp_association *asoc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | const union sctp_addr *laddr) |
| 1601 | { |
Vlad Yasevich | 559cf71 | 2007-09-16 16:03:28 -0700 | [diff] [blame] | 1602 | int found = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | if ((asoc->base.bind_addr.port == ntohs(laddr->v4.sin_port)) && |
| 1605 | sctp_bind_addr_match(&asoc->base.bind_addr, laddr, |
Vlad Yasevich | 559cf71 | 2007-09-16 16:03:28 -0700 | [diff] [blame] | 1606 | sctp_sk(asoc->base.sk))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | found = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | return found; |
| 1610 | } |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1611 | |
| 1612 | /* Set an association id for a given association */ |
| 1613 | int sctp_assoc_set_id(struct sctp_association *asoc, gfp_t gfp) |
| 1614 | { |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1615 | bool preload = gfpflags_allow_blocking(gfp); |
Tejun Heo | 94960e8 | 2013-02-27 17:05:00 -0800 | [diff] [blame] | 1616 | int ret; |
Vlad Yasevich | c6ba68a | 2009-06-01 12:41:15 -0400 | [diff] [blame] | 1617 | |
| 1618 | /* If the id is already assigned, keep it. */ |
| 1619 | if (asoc->assoc_id) |
Tejun Heo | 94960e8 | 2013-02-27 17:05:00 -0800 | [diff] [blame] | 1620 | return 0; |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1621 | |
Tejun Heo | 94960e8 | 2013-02-27 17:05:00 -0800 | [diff] [blame] | 1622 | if (preload) |
| 1623 | idr_preload(gfp); |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1624 | spin_lock_bh(&sctp_assocs_id_lock); |
Xin Long | 80df270 | 2019-01-28 15:08:23 +0800 | [diff] [blame] | 1625 | /* 0, 1, 2 are used as SCTP_FUTURE_ASSOC, SCTP_CURRENT_ASSOC and |
| 1626 | * SCTP_ALL_ASSOC, so an available id must be > SCTP_ALL_ASSOC. |
| 1627 | */ |
| 1628 | ret = idr_alloc_cyclic(&sctp_assocs_id, asoc, SCTP_ALL_ASSOC + 1, 0, |
| 1629 | GFP_NOWAIT); |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1630 | spin_unlock_bh(&sctp_assocs_id_lock); |
Tejun Heo | 94960e8 | 2013-02-27 17:05:00 -0800 | [diff] [blame] | 1631 | if (preload) |
| 1632 | idr_preload_end(); |
| 1633 | if (ret < 0) |
| 1634 | return ret; |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1635 | |
Tejun Heo | 94960e8 | 2013-02-27 17:05:00 -0800 | [diff] [blame] | 1636 | asoc->assoc_id = (sctp_assoc_t)ret; |
| 1637 | return 0; |
Vlad Yasevich | 07d9396 | 2007-05-04 13:55:27 -0700 | [diff] [blame] | 1638 | } |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1639 | |
Wei Yongjun | 8b4472c | 2011-05-24 21:48:02 +0000 | [diff] [blame] | 1640 | /* Free the ASCONF queue */ |
| 1641 | static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc) |
| 1642 | { |
| 1643 | struct sctp_chunk *asconf; |
| 1644 | struct sctp_chunk *tmp; |
| 1645 | |
| 1646 | list_for_each_entry_safe(asconf, tmp, &asoc->addip_chunk_list, list) { |
| 1647 | list_del_init(&asconf->list); |
| 1648 | sctp_chunk_free(asconf); |
| 1649 | } |
| 1650 | } |
| 1651 | |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1652 | /* Free asconf_ack cache */ |
| 1653 | static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc) |
| 1654 | { |
| 1655 | struct sctp_chunk *ack; |
| 1656 | struct sctp_chunk *tmp; |
| 1657 | |
| 1658 | list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list, |
| 1659 | transmitted_list) { |
| 1660 | list_del_init(&ack->transmitted_list); |
| 1661 | sctp_chunk_free(ack); |
| 1662 | } |
| 1663 | } |
| 1664 | |
| 1665 | /* Clean up the ASCONF_ACK queue */ |
| 1666 | void sctp_assoc_clean_asconf_ack_cache(const struct sctp_association *asoc) |
| 1667 | { |
| 1668 | struct sctp_chunk *ack; |
| 1669 | struct sctp_chunk *tmp; |
| 1670 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1671 | /* We can remove all the entries from the queue up to |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1672 | * the "Peer-Sequence-Number". |
| 1673 | */ |
| 1674 | list_for_each_entry_safe(ack, tmp, &asoc->asconf_ack_list, |
| 1675 | transmitted_list) { |
| 1676 | if (ack->subh.addip_hdr->serial == |
| 1677 | htonl(asoc->peer.addip_serial)) |
| 1678 | break; |
| 1679 | |
| 1680 | list_del_init(&ack->transmitted_list); |
| 1681 | sctp_chunk_free(ack); |
| 1682 | } |
| 1683 | } |
| 1684 | |
| 1685 | /* Find the ASCONF_ACK whose serial number matches ASCONF */ |
| 1686 | struct sctp_chunk *sctp_assoc_lookup_asconf_ack( |
| 1687 | const struct sctp_association *asoc, |
| 1688 | __be32 serial) |
| 1689 | { |
Wei Yongjun | a869981 | 2008-02-05 23:35:04 +0900 | [diff] [blame] | 1690 | struct sctp_chunk *ack; |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1691 | |
| 1692 | /* Walk through the list of cached ASCONF-ACKs and find the |
| 1693 | * ack chunk whose serial number matches that of the request. |
| 1694 | */ |
| 1695 | list_for_each_entry(ack, &asoc->asconf_ack_list, transmitted_list) { |
Daniel Borkmann | b69040d | 2014-10-09 22:55:32 +0200 | [diff] [blame] | 1696 | if (sctp_chunk_pending(ack)) |
| 1697 | continue; |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1698 | if (ack->subh.addip_hdr->serial == serial) { |
| 1699 | sctp_chunk_hold(ack); |
Wei Yongjun | a869981 | 2008-02-05 23:35:04 +0900 | [diff] [blame] | 1700 | return ack; |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1701 | } |
| 1702 | } |
| 1703 | |
Wei Yongjun | a869981 | 2008-02-05 23:35:04 +0900 | [diff] [blame] | 1704 | return NULL; |
Vlad Yasevich | a08de64 | 2007-12-20 14:11:47 -0800 | [diff] [blame] | 1705 | } |
Wei Yongjun | a000c01 | 2011-05-29 23:23:36 +0000 | [diff] [blame] | 1706 | |
| 1707 | void sctp_asconf_queue_teardown(struct sctp_association *asoc) |
| 1708 | { |
| 1709 | /* Free any cached ASCONF_ACK chunk. */ |
| 1710 | sctp_assoc_free_asconf_acks(asoc); |
| 1711 | |
| 1712 | /* Free the ASCONF queue. */ |
| 1713 | sctp_assoc_free_asconf_queue(asoc); |
| 1714 | |
| 1715 | /* Free any cached ASCONF chunk. */ |
| 1716 | if (asoc->addip_last_asconf) |
| 1717 | sctp_chunk_free(asoc->addip_last_asconf); |
| 1718 | } |