Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 1 | /* SCTP kernel implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Copyright (c) 1999-2000 Cisco, Inc. |
| 3 | * Copyright (c) 1999-2001 Motorola, Inc. |
| 4 | * Copyright (c) 2001-2002 International Business Machines, Corp. |
| 5 | * Copyright (c) 2001 Intel Corp. |
| 6 | * Copyright (c) 2001 Nokia, Inc. |
| 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 abstraction represents an SCTP endpoint. |
| 12 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 13 | * The SCTP implementation is free software; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * you can redistribute it and/or modify it under the terms of |
| 15 | * the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2, or (at your option) |
| 17 | * any later version. |
| 18 | * |
Vlad Yasevich | 60c778b | 2008-01-11 09:57:09 -0500 | [diff] [blame] | 19 | * The SCTP implementation is distributed in the hope that it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| 21 | * ************************ |
| 22 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| 23 | * See the GNU General Public License for more details. |
| 24 | * |
| 25 | * You should have received a copy of the GNU General Public License |
| 26 | * along with GNU CC; see the file COPYING. If not, write to |
| 27 | * the Free Software Foundation, 59 Temple Place - Suite 330, |
| 28 | * Boston, MA 02111-1307, USA. |
| 29 | * |
| 30 | * Please send any bug reports or fixes you make to the |
| 31 | * email address(es): |
| 32 | * lksctp developers <lksctp-developers@lists.sourceforge.net> |
| 33 | * |
| 34 | * Or submit a bug report through the following website: |
| 35 | * http://www.sf.net/projects/lksctp |
| 36 | * |
| 37 | * Written or modified by: |
| 38 | * La Monte H.P. Yarroll <piggy@acm.org> |
| 39 | * Karl Knutson <karl@athena.chicago.il.us> |
| 40 | * Jon Grimm <jgrimm@austin.ibm.com> |
| 41 | * Daisy Chang <daisyc@us.ibm.com> |
| 42 | * Dajiang Zhang <dajiang.zhang@nokia.com> |
| 43 | * |
| 44 | * Any bugs reported given to us we will try to fix... any fixes shared will |
| 45 | * be incorporated into the next SCTP release. |
| 46 | */ |
| 47 | |
| 48 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/slab.h> |
| 50 | #include <linux/in.h> |
| 51 | #include <linux/random.h> /* get_random_bytes() */ |
| 52 | #include <linux/crypto.h> |
| 53 | #include <net/sock.h> |
| 54 | #include <net/ipv6.h> |
| 55 | #include <net/sctp/sctp.h> |
| 56 | #include <net/sctp/sm.h> |
| 57 | |
| 58 | /* Forward declarations for internal helpers. */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 59 | static void sctp_endpoint_bh_rcv(struct work_struct *work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
| 61 | /* |
| 62 | * Initialize the base fields of the endpoint structure. |
| 63 | */ |
| 64 | static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep, |
Alexey Dobriyan | 3182cd84 | 2005-07-11 20:57:47 -0700 | [diff] [blame] | 65 | struct sock *sk, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 66 | gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | { |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 68 | struct sctp_hmac_algo_param *auth_hmacs = NULL; |
| 69 | struct sctp_chunks_param *auth_chunks = NULL; |
| 70 | struct sctp_shared_key *null_key; |
| 71 | int err; |
| 72 | |
Vlad Yasevich | b68dbca | 2006-11-09 16:29:57 -0800 | [diff] [blame] | 73 | ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp); |
| 74 | if (!ep->digest) |
| 75 | return NULL; |
| 76 | |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 77 | if (sctp_auth_enable) { |
| 78 | /* Allocate space for HMACS and CHUNKS authentication |
| 79 | * variables. There are arrays that we encode directly |
| 80 | * into parameters to make the rest of the operations easier. |
| 81 | */ |
| 82 | auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) + |
| 83 | sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp); |
| 84 | if (!auth_hmacs) |
| 85 | goto nomem; |
| 86 | |
| 87 | auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) + |
| 88 | SCTP_NUM_CHUNK_TYPES, gfp); |
| 89 | if (!auth_chunks) |
| 90 | goto nomem; |
| 91 | |
| 92 | /* Initialize the HMACS parameter. |
| 93 | * SCTP-AUTH: Section 3.3 |
| 94 | * Every endpoint supporting SCTP chunk authentication MUST |
| 95 | * support the HMAC based on the SHA-1 algorithm. |
| 96 | */ |
| 97 | auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO; |
| 98 | auth_hmacs->param_hdr.length = |
| 99 | htons(sizeof(sctp_paramhdr_t) + 2); |
| 100 | auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1); |
| 101 | |
| 102 | /* Initialize the CHUNKS parameter */ |
| 103 | auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS; |
Vlad Yasevich | 5e739d1 | 2008-08-21 03:34:25 -0700 | [diff] [blame] | 104 | auth_chunks->param_hdr.length = htons(sizeof(sctp_paramhdr_t)); |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 105 | |
| 106 | /* If the Add-IP functionality is enabled, we must |
| 107 | * authenticate, ASCONF and ASCONF-ACK chunks |
| 108 | */ |
| 109 | if (sctp_addip_enable) { |
| 110 | auth_chunks->chunks[0] = SCTP_CID_ASCONF; |
| 111 | auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK; |
Al Viro | cb0dc77 | 2009-03-18 19:12:42 -0700 | [diff] [blame] | 112 | auth_chunks->param_hdr.length = |
| 113 | htons(sizeof(sctp_paramhdr_t) + 2); |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 114 | } |
| 115 | } |
| 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | /* Initialize the base structure. */ |
| 118 | /* What type of endpoint are we? */ |
| 119 | ep->base.type = SCTP_EP_TYPE_SOCKET; |
| 120 | |
| 121 | /* Initialize the basic object fields. */ |
| 122 | atomic_set(&ep->base.refcnt, 1); |
| 123 | ep->base.dead = 0; |
| 124 | ep->base.malloced = 1; |
| 125 | |
| 126 | /* Create an input queue. */ |
| 127 | sctp_inq_init(&ep->base.inqueue); |
| 128 | |
| 129 | /* Set its top-half handler */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 130 | sctp_inq_set_th_handler(&ep->base.inqueue, sctp_endpoint_bh_rcv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
| 132 | /* Initialize the bind addr area */ |
| 133 | sctp_bind_addr_init(&ep->base.bind_addr, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | /* Remember who we are attached to. */ |
| 136 | ep->base.sk = sk; |
| 137 | sock_hold(ep->base.sk); |
| 138 | |
| 139 | /* Create the lists of associations. */ |
| 140 | INIT_LIST_HEAD(&ep->asocs); |
| 141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | /* Use SCTP specific send buffer space queues. */ |
Neil Horman | 4eb701d | 2005-04-28 12:02:04 -0700 | [diff] [blame] | 143 | ep->sndbuf_policy = sctp_sndbuf_policy; |
Neil Horman | 4d93df0 | 2007-08-15 16:07:44 -0700 | [diff] [blame] | 144 | |
Wei Yongjun | 561b173 | 2010-04-28 08:47:18 +0000 | [diff] [blame] | 145 | sk->sk_data_ready = sctp_data_ready; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | sk->sk_write_space = sctp_write_space; |
| 147 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); |
| 148 | |
Neil Horman | 049b3ff | 2005-11-11 16:08:24 -0800 | [diff] [blame] | 149 | /* Get the receive buffer policy for this endpoint */ |
| 150 | ep->rcvbuf_policy = sctp_rcvbuf_policy; |
| 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | /* Initialize the secret key used with cookie. */ |
| 153 | get_random_bytes(&ep->secret_key[0], SCTP_SECRET_SIZE); |
| 154 | ep->last_key = ep->current_key = 0; |
| 155 | ep->key_changed_at = jiffies; |
| 156 | |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 157 | /* SCTP-AUTH extensions*/ |
| 158 | INIT_LIST_HEAD(&ep->endpoint_shared_keys); |
| 159 | null_key = sctp_auth_shkey_create(0, GFP_KERNEL); |
| 160 | if (!null_key) |
| 161 | goto nomem; |
| 162 | |
| 163 | list_add(&null_key->key_list, &ep->endpoint_shared_keys); |
| 164 | |
| 165 | /* Allocate and initialize transorms arrays for suported HMACs. */ |
| 166 | err = sctp_auth_init_hmacs(ep, gfp); |
| 167 | if (err) |
| 168 | goto nomem_hmacs; |
| 169 | |
| 170 | /* Add the null key to the endpoint shared keys list and |
| 171 | * set the hmcas and chunks pointers. |
| 172 | */ |
| 173 | ep->auth_hmacs_list = auth_hmacs; |
| 174 | ep->auth_chunk_list = auth_chunks; |
| 175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | return ep; |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 177 | |
| 178 | nomem_hmacs: |
| 179 | sctp_auth_destroy_keys(&ep->endpoint_shared_keys); |
| 180 | nomem: |
| 181 | /* Free all allocations */ |
| 182 | kfree(auth_hmacs); |
| 183 | kfree(auth_chunks); |
| 184 | kfree(ep->digest); |
| 185 | return NULL; |
| 186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | /* Create a sctp_endpoint with all that boring stuff initialized. |
| 190 | * Returns NULL if there isn't enough memory. |
| 191 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 192 | struct sctp_endpoint *sctp_endpoint_new(struct sock *sk, gfp_t gfp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | { |
| 194 | struct sctp_endpoint *ep; |
| 195 | |
| 196 | /* Build a local endpoint. */ |
| 197 | ep = t_new(struct sctp_endpoint, gfp); |
| 198 | if (!ep) |
| 199 | goto fail; |
| 200 | if (!sctp_endpoint_init(ep, sk, gfp)) |
| 201 | goto fail_init; |
| 202 | ep->base.malloced = 1; |
| 203 | SCTP_DBG_OBJCNT_INC(ep); |
| 204 | return ep; |
| 205 | |
| 206 | fail_init: |
| 207 | kfree(ep); |
| 208 | fail: |
| 209 | return NULL; |
| 210 | } |
| 211 | |
| 212 | /* Add an association to an endpoint. */ |
| 213 | void sctp_endpoint_add_asoc(struct sctp_endpoint *ep, |
| 214 | struct sctp_association *asoc) |
| 215 | { |
| 216 | struct sock *sk = ep->base.sk; |
| 217 | |
Vlad Yasevich | de76e69 | 2006-10-30 18:55:11 -0800 | [diff] [blame] | 218 | /* If this is a temporary association, don't bother |
| 219 | * since we'll be removing it shortly and don't |
| 220 | * want anyone to find it anyway. |
| 221 | */ |
| 222 | if (asoc->temp) |
| 223 | return; |
| 224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | /* Now just add it to our list of asocs */ |
| 226 | list_add_tail(&asoc->asocs, &ep->asocs); |
| 227 | |
| 228 | /* Increment the backlog value for a TCP-style listening socket. */ |
| 229 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) |
| 230 | sk->sk_ack_backlog++; |
| 231 | } |
| 232 | |
| 233 | /* Free the endpoint structure. Delay cleanup until |
| 234 | * all users have released their reference count on this structure. |
| 235 | */ |
| 236 | void sctp_endpoint_free(struct sctp_endpoint *ep) |
| 237 | { |
| 238 | ep->base.dead = 1; |
Vlad Yasevich | cfdeef3 | 2006-07-21 14:48:26 -0700 | [diff] [blame] | 239 | |
| 240 | ep->base.sk->sk_state = SCTP_SS_CLOSED; |
| 241 | |
| 242 | /* Unlink this endpoint, so we can't find it again! */ |
| 243 | sctp_unhash_endpoint(ep); |
| 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | sctp_endpoint_put(ep); |
| 246 | } |
| 247 | |
| 248 | /* Final destructor for endpoint. */ |
| 249 | static void sctp_endpoint_destroy(struct sctp_endpoint *ep) |
| 250 | { |
Daniel Borkmann | ca36ba1 | 2013-02-08 03:04:35 +0000 | [diff] [blame] | 251 | int i; |
| 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return); |
| 254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | /* Free up the HMAC transform. */ |
Herbert Xu | 1b489e1 | 2006-08-20 15:07:14 +1000 | [diff] [blame] | 256 | crypto_free_hash(sctp_sk(ep->base.sk)->hmac); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
Vlad Yasevich | b68dbca | 2006-11-09 16:29:57 -0800 | [diff] [blame] | 258 | /* Free the digest buffer */ |
| 259 | kfree(ep->digest); |
| 260 | |
Vlad Yasevich | a29a5bd | 2007-09-16 19:31:35 -0700 | [diff] [blame] | 261 | /* SCTP-AUTH: Free up AUTH releated data such as shared keys |
| 262 | * chunks and hmacs arrays that were allocated |
| 263 | */ |
| 264 | sctp_auth_destroy_keys(&ep->endpoint_shared_keys); |
| 265 | kfree(ep->auth_hmacs_list); |
| 266 | kfree(ep->auth_chunk_list); |
| 267 | |
| 268 | /* AUTH - Free any allocated HMAC transform containers */ |
| 269 | sctp_auth_destroy_hmacs(ep->auth_hmacs); |
| 270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | /* Cleanup. */ |
| 272 | sctp_inq_free(&ep->base.inqueue); |
| 273 | sctp_bind_addr_free(&ep->base.bind_addr); |
| 274 | |
Daniel Borkmann | ca36ba1 | 2013-02-08 03:04:35 +0000 | [diff] [blame] | 275 | for (i = 0; i < SCTP_HOW_MANY_SECRETS; ++i) |
| 276 | memset(&ep->secret_key[i], 0, SCTP_SECRET_SIZE); |
| 277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | /* Remove and free the port */ |
| 279 | if (sctp_sk(ep->base.sk)->bind_hash) |
| 280 | sctp_put_port(ep->base.sk); |
| 281 | |
| 282 | /* Give up our hold on the sock. */ |
| 283 | if (ep->base.sk) |
| 284 | sock_put(ep->base.sk); |
| 285 | |
| 286 | /* Finally, free up our memory. */ |
| 287 | if (ep->base.malloced) { |
| 288 | kfree(ep); |
| 289 | SCTP_DBG_OBJCNT_DEC(ep); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | /* Hold a reference to an endpoint. */ |
| 294 | void sctp_endpoint_hold(struct sctp_endpoint *ep) |
| 295 | { |
| 296 | atomic_inc(&ep->base.refcnt); |
| 297 | } |
| 298 | |
| 299 | /* Release a reference to an endpoint and clean up if there are |
| 300 | * no more references. |
| 301 | */ |
| 302 | void sctp_endpoint_put(struct sctp_endpoint *ep) |
| 303 | { |
| 304 | if (atomic_dec_and_test(&ep->base.refcnt)) |
| 305 | sctp_endpoint_destroy(ep); |
| 306 | } |
| 307 | |
| 308 | /* Is this the endpoint we are looking for? */ |
| 309 | struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep, |
| 310 | const union sctp_addr *laddr) |
| 311 | { |
Vlad Yasevich | 559cf71 | 2007-09-16 16:03:28 -0700 | [diff] [blame] | 312 | struct sctp_endpoint *retval = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Al Viro | 1c7d1fc | 2006-11-20 17:08:09 -0800 | [diff] [blame] | 314 | if (htons(ep->base.bind_addr.port) == laddr->v4.sin_port) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | if (sctp_bind_addr_match(&ep->base.bind_addr, laddr, |
Vlad Yasevich | 559cf71 | 2007-09-16 16:03:28 -0700 | [diff] [blame] | 316 | sctp_sk(ep->base.sk))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | retval = ep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
| 319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | return retval; |
| 321 | } |
| 322 | |
| 323 | /* Find the association that goes with this chunk. |
| 324 | * We do a linear search of the associations for this endpoint. |
| 325 | * We return the matching transport address too. |
| 326 | */ |
| 327 | static struct sctp_association *__sctp_endpoint_lookup_assoc( |
| 328 | const struct sctp_endpoint *ep, |
| 329 | const union sctp_addr *paddr, |
| 330 | struct sctp_transport **transport) |
| 331 | { |
Vlad Yasevich | 123ed97 | 2007-11-09 11:41:36 -0500 | [diff] [blame] | 332 | struct sctp_association *asoc = NULL; |
Vlad Yasevich | deb85a6 | 2011-04-19 21:29:23 +0000 | [diff] [blame] | 333 | struct sctp_association *tmp; |
Vlad Yasevich | 123ed97 | 2007-11-09 11:41:36 -0500 | [diff] [blame] | 334 | struct sctp_transport *t = NULL; |
| 335 | struct sctp_hashbucket *head; |
| 336 | struct sctp_ep_common *epb; |
Vlad Yasevich | d970dbf | 2007-11-09 11:43:40 -0500 | [diff] [blame] | 337 | struct hlist_node *node; |
Vlad Yasevich | 123ed97 | 2007-11-09 11:41:36 -0500 | [diff] [blame] | 338 | int hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | int rport; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
| 341 | *transport = NULL; |
Vlad Yasevich | deb85a6 | 2011-04-19 21:29:23 +0000 | [diff] [blame] | 342 | |
| 343 | /* If the local port is not set, there can't be any associations |
| 344 | * on this endpoint. |
| 345 | */ |
| 346 | if (!ep->base.bind_addr.port) |
| 347 | goto out; |
| 348 | |
Vlad Yasevich | 123ed97 | 2007-11-09 11:41:36 -0500 | [diff] [blame] | 349 | rport = ntohs(paddr->v4.sin_port); |
| 350 | |
| 351 | hash = sctp_assoc_hashfn(ep->base.bind_addr.port, rport); |
| 352 | head = &sctp_assoc_hashtable[hash]; |
| 353 | read_lock(&head->lock); |
Vlad Yasevich | d970dbf | 2007-11-09 11:43:40 -0500 | [diff] [blame] | 354 | sctp_for_each_hentry(epb, node, &head->chain) { |
Vlad Yasevich | deb85a6 | 2011-04-19 21:29:23 +0000 | [diff] [blame] | 355 | tmp = sctp_assoc(epb); |
| 356 | if (tmp->ep != ep || rport != tmp->peer.port) |
| 357 | continue; |
Vlad Yasevich | 123ed97 | 2007-11-09 11:41:36 -0500 | [diff] [blame] | 358 | |
Vlad Yasevich | deb85a6 | 2011-04-19 21:29:23 +0000 | [diff] [blame] | 359 | t = sctp_assoc_lookup_paddr(tmp, paddr); |
Vlad Yasevich | 123ed97 | 2007-11-09 11:41:36 -0500 | [diff] [blame] | 360 | if (t) { |
Vlad Yasevich | deb85a6 | 2011-04-19 21:29:23 +0000 | [diff] [blame] | 361 | asoc = tmp; |
Vlad Yasevich | 123ed97 | 2007-11-09 11:41:36 -0500 | [diff] [blame] | 362 | *transport = t; |
| 363 | break; |
| 364 | } |
Vlad Yasevich | 123ed97 | 2007-11-09 11:41:36 -0500 | [diff] [blame] | 365 | } |
| 366 | read_unlock(&head->lock); |
Vlad Yasevich | deb85a6 | 2011-04-19 21:29:23 +0000 | [diff] [blame] | 367 | out: |
Vlad Yasevich | 123ed97 | 2007-11-09 11:41:36 -0500 | [diff] [blame] | 368 | return asoc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | } |
| 370 | |
| 371 | /* Lookup association on an endpoint based on a peer address. BH-safe. */ |
| 372 | struct sctp_association *sctp_endpoint_lookup_assoc( |
| 373 | const struct sctp_endpoint *ep, |
| 374 | const union sctp_addr *paddr, |
| 375 | struct sctp_transport **transport) |
| 376 | { |
| 377 | struct sctp_association *asoc; |
| 378 | |
| 379 | sctp_local_bh_disable(); |
| 380 | asoc = __sctp_endpoint_lookup_assoc(ep, paddr, transport); |
| 381 | sctp_local_bh_enable(); |
| 382 | |
| 383 | return asoc; |
| 384 | } |
| 385 | |
| 386 | /* Look for any peeled off association from the endpoint that matches the |
| 387 | * given peer address. |
| 388 | */ |
| 389 | int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep, |
| 390 | const union sctp_addr *paddr) |
| 391 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | struct sctp_sockaddr_entry *addr; |
| 393 | struct sctp_bind_addr *bp; |
| 394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | bp = &ep->base.bind_addr; |
Vlad Yasevich | 559cf71 | 2007-09-16 16:03:28 -0700 | [diff] [blame] | 396 | /* This function is called with the socket lock held, |
| 397 | * so the address_list can not change. |
| 398 | */ |
| 399 | list_for_each_entry(addr, &bp->address_list, list) { |
| 400 | if (sctp_has_association(&addr->a, paddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
| 404 | return 0; |
| 405 | } |
| 406 | |
| 407 | /* Do delayed input processing. This is scheduled by sctp_rcv(). |
| 408 | * This may be called on BH or task time. |
| 409 | */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 410 | static void sctp_endpoint_bh_rcv(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 412 | struct sctp_endpoint *ep = |
| 413 | container_of(work, struct sctp_endpoint, |
| 414 | base.inqueue.immediate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | struct sctp_association *asoc; |
| 416 | struct sock *sk; |
| 417 | struct sctp_transport *transport; |
| 418 | struct sctp_chunk *chunk; |
| 419 | struct sctp_inq *inqueue; |
| 420 | sctp_subtype_t subtype; |
| 421 | sctp_state_t state; |
| 422 | int error = 0; |
Justin P. Mattock | 42b2aa8 | 2011-11-28 20:31:00 -0800 | [diff] [blame] | 423 | int first_time = 1; /* is this the first time through the loop */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
| 425 | if (ep->base.dead) |
| 426 | return; |
| 427 | |
| 428 | asoc = NULL; |
| 429 | inqueue = &ep->base.inqueue; |
| 430 | sk = ep->base.sk; |
| 431 | |
| 432 | while (NULL != (chunk = sctp_inq_pop(inqueue))) { |
| 433 | subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type); |
| 434 | |
Vlad Yasevich | bbd0d59 | 2007-10-03 17:51:34 -0700 | [diff] [blame] | 435 | /* If the first chunk in the packet is AUTH, do special |
| 436 | * processing specified in Section 6.3 of SCTP-AUTH spec |
| 437 | */ |
| 438 | if (first_time && (subtype.chunk == SCTP_CID_AUTH)) { |
| 439 | struct sctp_chunkhdr *next_hdr; |
| 440 | |
| 441 | next_hdr = sctp_inq_peek(inqueue); |
| 442 | if (!next_hdr) |
| 443 | goto normal; |
| 444 | |
| 445 | /* If the next chunk is COOKIE-ECHO, skip the AUTH |
| 446 | * chunk while saving a pointer to it so we can do |
| 447 | * Authentication later (during cookie-echo |
| 448 | * processing). |
| 449 | */ |
| 450 | if (next_hdr->type == SCTP_CID_COOKIE_ECHO) { |
| 451 | chunk->auth_chunk = skb_clone(chunk->skb, |
| 452 | GFP_ATOMIC); |
| 453 | chunk->auth = 1; |
| 454 | continue; |
| 455 | } |
| 456 | } |
| 457 | normal: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | /* We might have grown an association since last we |
| 459 | * looked, so try again. |
| 460 | * |
| 461 | * This happens when we've just processed our |
| 462 | * COOKIE-ECHO chunk. |
| 463 | */ |
| 464 | if (NULL == chunk->asoc) { |
| 465 | asoc = sctp_endpoint_lookup_assoc(ep, |
| 466 | sctp_source(chunk), |
| 467 | &transport); |
| 468 | chunk->asoc = asoc; |
| 469 | chunk->transport = transport; |
| 470 | } |
| 471 | |
| 472 | state = asoc ? asoc->state : SCTP_STATE_CLOSED; |
Vlad Yasevich | bbd0d59 | 2007-10-03 17:51:34 -0700 | [diff] [blame] | 473 | if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth) |
| 474 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
| 476 | /* Remember where the last DATA chunk came from so we |
| 477 | * know where to send the SACK. |
| 478 | */ |
| 479 | if (asoc && sctp_chunk_is_data(chunk)) |
| 480 | asoc->peer.last_data_from = chunk->transport; |
| 481 | else |
| 482 | SCTP_INC_STATS(SCTP_MIB_INCTRLCHUNKS); |
| 483 | |
| 484 | if (chunk->transport) |
| 485 | chunk->transport->last_time_heard = jiffies; |
| 486 | |
| 487 | error = sctp_do_sm(SCTP_EVENT_T_CHUNK, subtype, state, |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 488 | ep, asoc, chunk, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | if (error && chunk) |
| 491 | chunk->pdiscard = 1; |
| 492 | |
| 493 | /* Check to see if the endpoint is freed in response to |
| 494 | * the incoming chunk. If so, get out of the while loop. |
| 495 | */ |
| 496 | if (!sctp_sk(sk)->ep) |
| 497 | break; |
Vlad Yasevich | bbd0d59 | 2007-10-03 17:51:34 -0700 | [diff] [blame] | 498 | |
| 499 | if (first_time) |
| 500 | first_time = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | } |
| 502 | } |