| 1 | /* SCTP kernel implementation |
| 2 | * (C) Copyright IBM Corp. 2001, 2004 |
| 3 | * Copyright (c) 1999-2000 Cisco, Inc. |
| 4 | * Copyright (c) 1999-2001 Motorola, Inc. |
| 5 | * Copyright (c) 2001 Intel Corp. |
| 6 | * Copyright (c) 2001 Nokia, Inc. |
| 7 | * Copyright (c) 2001 La Monte H.P. Yarroll |
| 8 | * |
| 9 | * This file is part of the SCTP kernel implementation |
| 10 | * |
| 11 | * Initialization/cleanup for SCTP protocol support. |
| 12 | * |
| 13 | * This SCTP implementation is free software; |
| 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 | * |
| 19 | * This SCTP implementation is distributed in the hope that it |
| 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, see |
| 27 | * <http://www.gnu.org/licenses/>. |
| 28 | * |
| 29 | * Please send any bug reports or fixes you make to the |
| 30 | * email address(es): |
| 31 | * lksctp developers <linux-sctp@vger.kernel.org> |
| 32 | * |
| 33 | * Written or modified by: |
| 34 | * La Monte H.P. Yarroll <piggy@acm.org> |
| 35 | * Karl Knutson <karl@athena.chicago.il.us> |
| 36 | * Jon Grimm <jgrimm@us.ibm.com> |
| 37 | * Sridhar Samudrala <sri@us.ibm.com> |
| 38 | * Daisy Chang <daisyc@us.ibm.com> |
| 39 | * Ardelle Fan <ardelle.fan@intel.com> |
| 40 | */ |
| 41 | |
| 42 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 43 | |
| 44 | #include <linux/module.h> |
| 45 | #include <linux/init.h> |
| 46 | #include <linux/netdevice.h> |
| 47 | #include <linux/inetdevice.h> |
| 48 | #include <linux/seq_file.h> |
| 49 | #include <linux/bootmem.h> |
| 50 | #include <linux/highmem.h> |
| 51 | #include <linux/swap.h> |
| 52 | #include <linux/slab.h> |
| 53 | #include <net/net_namespace.h> |
| 54 | #include <net/protocol.h> |
| 55 | #include <net/ip.h> |
| 56 | #include <net/ipv6.h> |
| 57 | #include <net/route.h> |
| 58 | #include <net/sctp/sctp.h> |
| 59 | #include <net/addrconf.h> |
| 60 | #include <net/inet_common.h> |
| 61 | #include <net/inet_ecn.h> |
| 62 | |
| 63 | #define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024) |
| 64 | |
| 65 | /* Global data structures. */ |
| 66 | struct sctp_globals sctp_globals __read_mostly; |
| 67 | |
| 68 | struct idr sctp_assocs_id; |
| 69 | DEFINE_SPINLOCK(sctp_assocs_id_lock); |
| 70 | |
| 71 | static struct sctp_pf *sctp_pf_inet6_specific; |
| 72 | static struct sctp_pf *sctp_pf_inet_specific; |
| 73 | static struct sctp_af *sctp_af_v4_specific; |
| 74 | static struct sctp_af *sctp_af_v6_specific; |
| 75 | |
| 76 | struct kmem_cache *sctp_chunk_cachep __read_mostly; |
| 77 | struct kmem_cache *sctp_bucket_cachep __read_mostly; |
| 78 | |
| 79 | long sysctl_sctp_mem[3]; |
| 80 | int sysctl_sctp_rmem[3]; |
| 81 | int sysctl_sctp_wmem[3]; |
| 82 | |
| 83 | /* Set up the proc fs entry for the SCTP protocol. */ |
| 84 | static int __net_init sctp_proc_init(struct net *net) |
| 85 | { |
| 86 | #ifdef CONFIG_PROC_FS |
| 87 | net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); |
| 88 | if (!net->sctp.proc_net_sctp) |
| 89 | goto out_proc_net_sctp; |
| 90 | if (sctp_snmp_proc_init(net)) |
| 91 | goto out_snmp_proc_init; |
| 92 | if (sctp_eps_proc_init(net)) |
| 93 | goto out_eps_proc_init; |
| 94 | if (sctp_assocs_proc_init(net)) |
| 95 | goto out_assocs_proc_init; |
| 96 | if (sctp_remaddr_proc_init(net)) |
| 97 | goto out_remaddr_proc_init; |
| 98 | |
| 99 | return 0; |
| 100 | |
| 101 | out_remaddr_proc_init: |
| 102 | sctp_assocs_proc_exit(net); |
| 103 | out_assocs_proc_init: |
| 104 | sctp_eps_proc_exit(net); |
| 105 | out_eps_proc_init: |
| 106 | sctp_snmp_proc_exit(net); |
| 107 | out_snmp_proc_init: |
| 108 | remove_proc_entry("sctp", net->proc_net); |
| 109 | net->sctp.proc_net_sctp = NULL; |
| 110 | out_proc_net_sctp: |
| 111 | return -ENOMEM; |
| 112 | #endif /* CONFIG_PROC_FS */ |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | /* Clean up the proc fs entry for the SCTP protocol. |
| 117 | * Note: Do not make this __exit as it is used in the init error |
| 118 | * path. |
| 119 | */ |
| 120 | static void sctp_proc_exit(struct net *net) |
| 121 | { |
| 122 | #ifdef CONFIG_PROC_FS |
| 123 | sctp_snmp_proc_exit(net); |
| 124 | sctp_eps_proc_exit(net); |
| 125 | sctp_assocs_proc_exit(net); |
| 126 | sctp_remaddr_proc_exit(net); |
| 127 | |
| 128 | remove_proc_entry("sctp", net->proc_net); |
| 129 | net->sctp.proc_net_sctp = NULL; |
| 130 | #endif |
| 131 | } |
| 132 | |
| 133 | /* Private helper to extract ipv4 address and stash them in |
| 134 | * the protocol structure. |
| 135 | */ |
| 136 | static void sctp_v4_copy_addrlist(struct list_head *addrlist, |
| 137 | struct net_device *dev) |
| 138 | { |
| 139 | struct in_device *in_dev; |
| 140 | struct in_ifaddr *ifa; |
| 141 | struct sctp_sockaddr_entry *addr; |
| 142 | |
| 143 | rcu_read_lock(); |
| 144 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { |
| 145 | rcu_read_unlock(); |
| 146 | return; |
| 147 | } |
| 148 | |
| 149 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
| 150 | /* Add the address to the local list. */ |
| 151 | addr = kzalloc(sizeof(*addr), GFP_ATOMIC); |
| 152 | if (addr) { |
| 153 | addr->a.v4.sin_family = AF_INET; |
| 154 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; |
| 155 | addr->valid = 1; |
| 156 | INIT_LIST_HEAD(&addr->list); |
| 157 | list_add_tail(&addr->list, addrlist); |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | rcu_read_unlock(); |
| 162 | } |
| 163 | |
| 164 | /* Extract our IP addresses from the system and stash them in the |
| 165 | * protocol structure. |
| 166 | */ |
| 167 | static void sctp_get_local_addr_list(struct net *net) |
| 168 | { |
| 169 | struct net_device *dev; |
| 170 | struct list_head *pos; |
| 171 | struct sctp_af *af; |
| 172 | |
| 173 | rcu_read_lock(); |
| 174 | for_each_netdev_rcu(net, dev) { |
| 175 | list_for_each(pos, &sctp_address_families) { |
| 176 | af = list_entry(pos, struct sctp_af, list); |
| 177 | af->copy_addrlist(&net->sctp.local_addr_list, dev); |
| 178 | } |
| 179 | } |
| 180 | rcu_read_unlock(); |
| 181 | } |
| 182 | |
| 183 | /* Free the existing local addresses. */ |
| 184 | static void sctp_free_local_addr_list(struct net *net) |
| 185 | { |
| 186 | struct sctp_sockaddr_entry *addr; |
| 187 | struct list_head *pos, *temp; |
| 188 | |
| 189 | list_for_each_safe(pos, temp, &net->sctp.local_addr_list) { |
| 190 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
| 191 | list_del(pos); |
| 192 | kfree(addr); |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | /* Copy the local addresses which are valid for 'scope' into 'bp'. */ |
| 197 | int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp, |
| 198 | enum sctp_scope scope, gfp_t gfp, int copy_flags) |
| 199 | { |
| 200 | struct sctp_sockaddr_entry *addr; |
| 201 | union sctp_addr laddr; |
| 202 | int error = 0; |
| 203 | |
| 204 | rcu_read_lock(); |
| 205 | list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) { |
| 206 | if (!addr->valid) |
| 207 | continue; |
| 208 | if (!sctp_in_scope(net, &addr->a, scope)) |
| 209 | continue; |
| 210 | |
| 211 | /* Now that the address is in scope, check to see if |
| 212 | * the address type is really supported by the local |
| 213 | * sock as well as the remote peer. |
| 214 | */ |
| 215 | if (addr->a.sa.sa_family == AF_INET && |
| 216 | !(copy_flags & SCTP_ADDR4_PEERSUPP)) |
| 217 | continue; |
| 218 | if (addr->a.sa.sa_family == AF_INET6 && |
| 219 | (!(copy_flags & SCTP_ADDR6_ALLOWED) || |
| 220 | !(copy_flags & SCTP_ADDR6_PEERSUPP))) |
| 221 | continue; |
| 222 | |
| 223 | laddr = addr->a; |
| 224 | /* also works for setting ipv6 address port */ |
| 225 | laddr.v4.sin_port = htons(bp->port); |
| 226 | if (sctp_bind_addr_state(bp, &laddr) != -1) |
| 227 | continue; |
| 228 | |
| 229 | error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a), |
| 230 | SCTP_ADDR_SRC, GFP_ATOMIC); |
| 231 | if (error) |
| 232 | break; |
| 233 | } |
| 234 | |
| 235 | rcu_read_unlock(); |
| 236 | return error; |
| 237 | } |
| 238 | |
| 239 | /* Initialize a sctp_addr from in incoming skb. */ |
| 240 | static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, |
| 241 | int is_saddr) |
| 242 | { |
| 243 | /* Always called on head skb, so this is safe */ |
| 244 | struct sctphdr *sh = sctp_hdr(skb); |
| 245 | struct sockaddr_in *sa = &addr->v4; |
| 246 | |
| 247 | addr->v4.sin_family = AF_INET; |
| 248 | |
| 249 | if (is_saddr) { |
| 250 | sa->sin_port = sh->source; |
| 251 | sa->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| 252 | } else { |
| 253 | sa->sin_port = sh->dest; |
| 254 | sa->sin_addr.s_addr = ip_hdr(skb)->daddr; |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | /* Initialize an sctp_addr from a socket. */ |
| 259 | static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) |
| 260 | { |
| 261 | addr->v4.sin_family = AF_INET; |
| 262 | addr->v4.sin_port = 0; |
| 263 | addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; |
| 264 | } |
| 265 | |
| 266 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ |
| 267 | static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) |
| 268 | { |
| 269 | inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; |
| 270 | } |
| 271 | |
| 272 | /* Initialize sk->sk_daddr from sctp_addr. */ |
| 273 | static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) |
| 274 | { |
| 275 | inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; |
| 276 | } |
| 277 | |
| 278 | /* Initialize a sctp_addr from an address parameter. */ |
| 279 | static void sctp_v4_from_addr_param(union sctp_addr *addr, |
| 280 | union sctp_addr_param *param, |
| 281 | __be16 port, int iif) |
| 282 | { |
| 283 | addr->v4.sin_family = AF_INET; |
| 284 | addr->v4.sin_port = port; |
| 285 | addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; |
| 286 | } |
| 287 | |
| 288 | /* Initialize an address parameter from a sctp_addr and return the length |
| 289 | * of the address parameter. |
| 290 | */ |
| 291 | static int sctp_v4_to_addr_param(const union sctp_addr *addr, |
| 292 | union sctp_addr_param *param) |
| 293 | { |
| 294 | int length = sizeof(struct sctp_ipv4addr_param); |
| 295 | |
| 296 | param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; |
| 297 | param->v4.param_hdr.length = htons(length); |
| 298 | param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; |
| 299 | |
| 300 | return length; |
| 301 | } |
| 302 | |
| 303 | /* Initialize a sctp_addr from a dst_entry. */ |
| 304 | static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4, |
| 305 | __be16 port) |
| 306 | { |
| 307 | saddr->v4.sin_family = AF_INET; |
| 308 | saddr->v4.sin_port = port; |
| 309 | saddr->v4.sin_addr.s_addr = fl4->saddr; |
| 310 | } |
| 311 | |
| 312 | /* Compare two addresses exactly. */ |
| 313 | static int sctp_v4_cmp_addr(const union sctp_addr *addr1, |
| 314 | const union sctp_addr *addr2) |
| 315 | { |
| 316 | if (addr1->sa.sa_family != addr2->sa.sa_family) |
| 317 | return 0; |
| 318 | if (addr1->v4.sin_port != addr2->v4.sin_port) |
| 319 | return 0; |
| 320 | if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) |
| 321 | return 0; |
| 322 | |
| 323 | return 1; |
| 324 | } |
| 325 | |
| 326 | /* Initialize addr struct to INADDR_ANY. */ |
| 327 | static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) |
| 328 | { |
| 329 | addr->v4.sin_family = AF_INET; |
| 330 | addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); |
| 331 | addr->v4.sin_port = port; |
| 332 | } |
| 333 | |
| 334 | /* Is this a wildcard address? */ |
| 335 | static int sctp_v4_is_any(const union sctp_addr *addr) |
| 336 | { |
| 337 | return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; |
| 338 | } |
| 339 | |
| 340 | /* This function checks if the address is a valid address to be used for |
| 341 | * SCTP binding. |
| 342 | * |
| 343 | * Output: |
| 344 | * Return 0 - If the address is a non-unicast or an illegal address. |
| 345 | * Return 1 - If the address is a unicast. |
| 346 | */ |
| 347 | static int sctp_v4_addr_valid(union sctp_addr *addr, |
| 348 | struct sctp_sock *sp, |
| 349 | const struct sk_buff *skb) |
| 350 | { |
| 351 | /* IPv4 addresses not allowed */ |
| 352 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) |
| 353 | return 0; |
| 354 | |
| 355 | /* Is this a non-unicast address or a unusable SCTP address? */ |
| 356 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) |
| 357 | return 0; |
| 358 | |
| 359 | /* Is this a broadcast address? */ |
| 360 | if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) |
| 361 | return 0; |
| 362 | |
| 363 | return 1; |
| 364 | } |
| 365 | |
| 366 | /* Should this be available for binding? */ |
| 367 | static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) |
| 368 | { |
| 369 | struct net *net = sock_net(&sp->inet.sk); |
| 370 | int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr); |
| 371 | |
| 372 | |
| 373 | if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && |
| 374 | ret != RTN_LOCAL && |
| 375 | !sp->inet.freebind && |
| 376 | !net->ipv4.sysctl_ip_nonlocal_bind) |
| 377 | return 0; |
| 378 | |
| 379 | if (ipv6_only_sock(sctp_opt2sk(sp))) |
| 380 | return 0; |
| 381 | |
| 382 | return 1; |
| 383 | } |
| 384 | |
| 385 | /* Checking the loopback, private and other address scopes as defined in |
| 386 | * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 |
| 387 | * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. |
| 388 | * |
| 389 | * Level 0 - unusable SCTP addresses |
| 390 | * Level 1 - loopback address |
| 391 | * Level 2 - link-local addresses |
| 392 | * Level 3 - private addresses. |
| 393 | * Level 4 - global addresses |
| 394 | * For INIT and INIT-ACK address list, let L be the level of |
| 395 | * of requested destination address, sender and receiver |
| 396 | * SHOULD include all of its addresses with level greater |
| 397 | * than or equal to L. |
| 398 | * |
| 399 | * IPv4 scoping can be controlled through sysctl option |
| 400 | * net.sctp.addr_scope_policy |
| 401 | */ |
| 402 | static enum sctp_scope sctp_v4_scope(union sctp_addr *addr) |
| 403 | { |
| 404 | enum sctp_scope retval; |
| 405 | |
| 406 | /* Check for unusable SCTP addresses. */ |
| 407 | if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { |
| 408 | retval = SCTP_SCOPE_UNUSABLE; |
| 409 | } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { |
| 410 | retval = SCTP_SCOPE_LOOPBACK; |
| 411 | } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { |
| 412 | retval = SCTP_SCOPE_LINK; |
| 413 | } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || |
| 414 | ipv4_is_private_172(addr->v4.sin_addr.s_addr) || |
| 415 | ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { |
| 416 | retval = SCTP_SCOPE_PRIVATE; |
| 417 | } else { |
| 418 | retval = SCTP_SCOPE_GLOBAL; |
| 419 | } |
| 420 | |
| 421 | return retval; |
| 422 | } |
| 423 | |
| 424 | /* Returns a valid dst cache entry for the given source and destination ip |
| 425 | * addresses. If an association is passed, trys to get a dst entry with a |
| 426 | * source address that matches an address in the bind address list. |
| 427 | */ |
| 428 | static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr, |
| 429 | struct flowi *fl, struct sock *sk) |
| 430 | { |
| 431 | struct sctp_association *asoc = t->asoc; |
| 432 | struct rtable *rt; |
| 433 | struct flowi4 *fl4 = &fl->u.ip4; |
| 434 | struct sctp_bind_addr *bp; |
| 435 | struct sctp_sockaddr_entry *laddr; |
| 436 | struct dst_entry *dst = NULL; |
| 437 | union sctp_addr *daddr = &t->ipaddr; |
| 438 | union sctp_addr dst_saddr; |
| 439 | |
| 440 | memset(fl4, 0x0, sizeof(struct flowi4)); |
| 441 | fl4->daddr = daddr->v4.sin_addr.s_addr; |
| 442 | fl4->fl4_dport = daddr->v4.sin_port; |
| 443 | fl4->flowi4_proto = IPPROTO_SCTP; |
| 444 | if (asoc) { |
| 445 | fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk); |
| 446 | fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if; |
| 447 | fl4->fl4_sport = htons(asoc->base.bind_addr.port); |
| 448 | } |
| 449 | if (saddr) { |
| 450 | fl4->saddr = saddr->v4.sin_addr.s_addr; |
| 451 | fl4->fl4_sport = saddr->v4.sin_port; |
| 452 | } |
| 453 | |
| 454 | pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr, |
| 455 | &fl4->saddr); |
| 456 | |
| 457 | rt = ip_route_output_key(sock_net(sk), fl4); |
| 458 | if (!IS_ERR(rt)) |
| 459 | dst = &rt->dst; |
| 460 | |
| 461 | /* If there is no association or if a source address is passed, no |
| 462 | * more validation is required. |
| 463 | */ |
| 464 | if (!asoc || saddr) |
| 465 | goto out; |
| 466 | |
| 467 | bp = &asoc->base.bind_addr; |
| 468 | |
| 469 | if (dst) { |
| 470 | /* Walk through the bind address list and look for a bind |
| 471 | * address that matches the source address of the returned dst. |
| 472 | */ |
| 473 | sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port)); |
| 474 | rcu_read_lock(); |
| 475 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
| 476 | if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) || |
| 477 | (laddr->state != SCTP_ADDR_SRC && |
| 478 | !asoc->src_out_of_asoc_ok)) |
| 479 | continue; |
| 480 | if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) |
| 481 | goto out_unlock; |
| 482 | } |
| 483 | rcu_read_unlock(); |
| 484 | |
| 485 | /* None of the bound addresses match the source address of the |
| 486 | * dst. So release it. |
| 487 | */ |
| 488 | dst_release(dst); |
| 489 | dst = NULL; |
| 490 | } |
| 491 | |
| 492 | /* Walk through the bind address list and try to get a dst that |
| 493 | * matches a bind address as the source address. |
| 494 | */ |
| 495 | rcu_read_lock(); |
| 496 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
| 497 | struct net_device *odev; |
| 498 | |
| 499 | if (!laddr->valid) |
| 500 | continue; |
| 501 | if (laddr->state != SCTP_ADDR_SRC || |
| 502 | AF_INET != laddr->a.sa.sa_family) |
| 503 | continue; |
| 504 | |
| 505 | fl4->fl4_sport = laddr->a.v4.sin_port; |
| 506 | flowi4_update_output(fl4, |
| 507 | asoc->base.sk->sk_bound_dev_if, |
| 508 | RT_CONN_FLAGS(asoc->base.sk), |
| 509 | daddr->v4.sin_addr.s_addr, |
| 510 | laddr->a.v4.sin_addr.s_addr); |
| 511 | |
| 512 | rt = ip_route_output_key(sock_net(sk), fl4); |
| 513 | if (IS_ERR(rt)) |
| 514 | continue; |
| 515 | |
| 516 | /* Ensure the src address belongs to the output |
| 517 | * interface. |
| 518 | */ |
| 519 | odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr, |
| 520 | false); |
| 521 | if (!odev || odev->ifindex != fl4->flowi4_oif) { |
| 522 | if (!dst) |
| 523 | dst = &rt->dst; |
| 524 | else |
| 525 | dst_release(&rt->dst); |
| 526 | continue; |
| 527 | } |
| 528 | |
| 529 | dst_release(dst); |
| 530 | dst = &rt->dst; |
| 531 | break; |
| 532 | } |
| 533 | |
| 534 | out_unlock: |
| 535 | rcu_read_unlock(); |
| 536 | out: |
| 537 | t->dst = dst; |
| 538 | if (dst) |
| 539 | pr_debug("rt_dst:%pI4, rt_src:%pI4\n", |
| 540 | &fl4->daddr, &fl4->saddr); |
| 541 | else |
| 542 | pr_debug("no route\n"); |
| 543 | } |
| 544 | |
| 545 | /* For v4, the source address is cached in the route entry(dst). So no need |
| 546 | * to cache it separately and hence this is an empty routine. |
| 547 | */ |
| 548 | static void sctp_v4_get_saddr(struct sctp_sock *sk, |
| 549 | struct sctp_transport *t, |
| 550 | struct flowi *fl) |
| 551 | { |
| 552 | union sctp_addr *saddr = &t->saddr; |
| 553 | struct rtable *rt = (struct rtable *)t->dst; |
| 554 | |
| 555 | if (rt) { |
| 556 | saddr->v4.sin_family = AF_INET; |
| 557 | saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | /* What interface did this skb arrive on? */ |
| 562 | static int sctp_v4_skb_iif(const struct sk_buff *skb) |
| 563 | { |
| 564 | return inet_iif(skb); |
| 565 | } |
| 566 | |
| 567 | /* Was this packet marked by Explicit Congestion Notification? */ |
| 568 | static int sctp_v4_is_ce(const struct sk_buff *skb) |
| 569 | { |
| 570 | return INET_ECN_is_ce(ip_hdr(skb)->tos); |
| 571 | } |
| 572 | |
| 573 | /* Create and initialize a new sk for the socket returned by accept(). */ |
| 574 | static struct sock *sctp_v4_create_accept_sk(struct sock *sk, |
| 575 | struct sctp_association *asoc, |
| 576 | bool kern) |
| 577 | { |
| 578 | struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, |
| 579 | sk->sk_prot, kern); |
| 580 | struct inet_sock *newinet; |
| 581 | |
| 582 | if (!newsk) |
| 583 | goto out; |
| 584 | |
| 585 | sock_init_data(NULL, newsk); |
| 586 | |
| 587 | sctp_copy_sock(newsk, sk, asoc); |
| 588 | sock_reset_flag(newsk, SOCK_ZAPPED); |
| 589 | |
| 590 | newinet = inet_sk(newsk); |
| 591 | |
| 592 | newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; |
| 593 | |
| 594 | sk_refcnt_debug_inc(newsk); |
| 595 | |
| 596 | if (newsk->sk_prot->init(newsk)) { |
| 597 | sk_common_release(newsk); |
| 598 | newsk = NULL; |
| 599 | } |
| 600 | |
| 601 | out: |
| 602 | return newsk; |
| 603 | } |
| 604 | |
| 605 | static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr) |
| 606 | { |
| 607 | /* No address mapping for V4 sockets */ |
| 608 | memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); |
| 609 | return sizeof(struct sockaddr_in); |
| 610 | } |
| 611 | |
| 612 | /* Dump the v4 addr to the seq file. */ |
| 613 | static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) |
| 614 | { |
| 615 | seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); |
| 616 | } |
| 617 | |
| 618 | static void sctp_v4_ecn_capable(struct sock *sk) |
| 619 | { |
| 620 | INET_ECN_xmit(sk); |
| 621 | } |
| 622 | |
| 623 | static void sctp_addr_wq_timeout_handler(unsigned long arg) |
| 624 | { |
| 625 | struct net *net = (struct net *)arg; |
| 626 | struct sctp_sockaddr_entry *addrw, *temp; |
| 627 | struct sctp_sock *sp; |
| 628 | |
| 629 | spin_lock_bh(&net->sctp.addr_wq_lock); |
| 630 | |
| 631 | list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { |
| 632 | pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at " |
| 633 | "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa, |
| 634 | addrw->state, addrw); |
| 635 | |
| 636 | #if IS_ENABLED(CONFIG_IPV6) |
| 637 | /* Now we send an ASCONF for each association */ |
| 638 | /* Note. we currently don't handle link local IPv6 addressees */ |
| 639 | if (addrw->a.sa.sa_family == AF_INET6) { |
| 640 | struct in6_addr *in6; |
| 641 | |
| 642 | if (ipv6_addr_type(&addrw->a.v6.sin6_addr) & |
| 643 | IPV6_ADDR_LINKLOCAL) |
| 644 | goto free_next; |
| 645 | |
| 646 | in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr; |
| 647 | if (ipv6_chk_addr(net, in6, NULL, 0) == 0 && |
| 648 | addrw->state == SCTP_ADDR_NEW) { |
| 649 | unsigned long timeo_val; |
| 650 | |
| 651 | pr_debug("%s: this is on DAD, trying %d sec " |
| 652 | "later\n", __func__, |
| 653 | SCTP_ADDRESS_TICK_DELAY); |
| 654 | |
| 655 | timeo_val = jiffies; |
| 656 | timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); |
| 657 | mod_timer(&net->sctp.addr_wq_timer, timeo_val); |
| 658 | break; |
| 659 | } |
| 660 | } |
| 661 | #endif |
| 662 | list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) { |
| 663 | struct sock *sk; |
| 664 | |
| 665 | sk = sctp_opt2sk(sp); |
| 666 | /* ignore bound-specific endpoints */ |
| 667 | if (!sctp_is_ep_boundall(sk)) |
| 668 | continue; |
| 669 | bh_lock_sock(sk); |
| 670 | if (sctp_asconf_mgmt(sp, addrw) < 0) |
| 671 | pr_debug("%s: sctp_asconf_mgmt failed\n", __func__); |
| 672 | bh_unlock_sock(sk); |
| 673 | } |
| 674 | #if IS_ENABLED(CONFIG_IPV6) |
| 675 | free_next: |
| 676 | #endif |
| 677 | list_del(&addrw->list); |
| 678 | kfree(addrw); |
| 679 | } |
| 680 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
| 681 | } |
| 682 | |
| 683 | static void sctp_free_addr_wq(struct net *net) |
| 684 | { |
| 685 | struct sctp_sockaddr_entry *addrw; |
| 686 | struct sctp_sockaddr_entry *temp; |
| 687 | |
| 688 | spin_lock_bh(&net->sctp.addr_wq_lock); |
| 689 | del_timer(&net->sctp.addr_wq_timer); |
| 690 | list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { |
| 691 | list_del(&addrw->list); |
| 692 | kfree(addrw); |
| 693 | } |
| 694 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
| 695 | } |
| 696 | |
| 697 | /* lookup the entry for the same address in the addr_waitq |
| 698 | * sctp_addr_wq MUST be locked |
| 699 | */ |
| 700 | static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net, |
| 701 | struct sctp_sockaddr_entry *addr) |
| 702 | { |
| 703 | struct sctp_sockaddr_entry *addrw; |
| 704 | |
| 705 | list_for_each_entry(addrw, &net->sctp.addr_waitq, list) { |
| 706 | if (addrw->a.sa.sa_family != addr->a.sa.sa_family) |
| 707 | continue; |
| 708 | if (addrw->a.sa.sa_family == AF_INET) { |
| 709 | if (addrw->a.v4.sin_addr.s_addr == |
| 710 | addr->a.v4.sin_addr.s_addr) |
| 711 | return addrw; |
| 712 | } else if (addrw->a.sa.sa_family == AF_INET6) { |
| 713 | if (ipv6_addr_equal(&addrw->a.v6.sin6_addr, |
| 714 | &addr->a.v6.sin6_addr)) |
| 715 | return addrw; |
| 716 | } |
| 717 | } |
| 718 | return NULL; |
| 719 | } |
| 720 | |
| 721 | void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd) |
| 722 | { |
| 723 | struct sctp_sockaddr_entry *addrw; |
| 724 | unsigned long timeo_val; |
| 725 | |
| 726 | /* first, we check if an opposite message already exist in the queue. |
| 727 | * If we found such message, it is removed. |
| 728 | * This operation is a bit stupid, but the DHCP client attaches the |
| 729 | * new address after a couple of addition and deletion of that address |
| 730 | */ |
| 731 | |
| 732 | spin_lock_bh(&net->sctp.addr_wq_lock); |
| 733 | /* Offsets existing events in addr_wq */ |
| 734 | addrw = sctp_addr_wq_lookup(net, addr); |
| 735 | if (addrw) { |
| 736 | if (addrw->state != cmd) { |
| 737 | pr_debug("%s: offsets existing entry for %d, addr:%pISc " |
| 738 | "in wq:%p\n", __func__, addrw->state, &addrw->a.sa, |
| 739 | &net->sctp.addr_waitq); |
| 740 | |
| 741 | list_del(&addrw->list); |
| 742 | kfree(addrw); |
| 743 | } |
| 744 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
| 745 | return; |
| 746 | } |
| 747 | |
| 748 | /* OK, we have to add the new address to the wait queue */ |
| 749 | addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); |
| 750 | if (addrw == NULL) { |
| 751 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
| 752 | return; |
| 753 | } |
| 754 | addrw->state = cmd; |
| 755 | list_add_tail(&addrw->list, &net->sctp.addr_waitq); |
| 756 | |
| 757 | pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n", |
| 758 | __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq); |
| 759 | |
| 760 | if (!timer_pending(&net->sctp.addr_wq_timer)) { |
| 761 | timeo_val = jiffies; |
| 762 | timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); |
| 763 | mod_timer(&net->sctp.addr_wq_timer, timeo_val); |
| 764 | } |
| 765 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
| 766 | } |
| 767 | |
| 768 | /* Event handler for inet address addition/deletion events. |
| 769 | * The sctp_local_addr_list needs to be protocted by a spin lock since |
| 770 | * multiple notifiers (say IPv4 and IPv6) may be running at the same |
| 771 | * time and thus corrupt the list. |
| 772 | * The reader side is protected with RCU. |
| 773 | */ |
| 774 | static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, |
| 775 | void *ptr) |
| 776 | { |
| 777 | struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; |
| 778 | struct sctp_sockaddr_entry *addr = NULL; |
| 779 | struct sctp_sockaddr_entry *temp; |
| 780 | struct net *net = dev_net(ifa->ifa_dev->dev); |
| 781 | int found = 0; |
| 782 | |
| 783 | switch (ev) { |
| 784 | case NETDEV_UP: |
| 785 | addr = kzalloc(sizeof(*addr), GFP_ATOMIC); |
| 786 | if (addr) { |
| 787 | addr->a.v4.sin_family = AF_INET; |
| 788 | addr->a.v4.sin_addr.s_addr = ifa->ifa_local; |
| 789 | addr->valid = 1; |
| 790 | spin_lock_bh(&net->sctp.local_addr_lock); |
| 791 | list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); |
| 792 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); |
| 793 | spin_unlock_bh(&net->sctp.local_addr_lock); |
| 794 | } |
| 795 | break; |
| 796 | case NETDEV_DOWN: |
| 797 | spin_lock_bh(&net->sctp.local_addr_lock); |
| 798 | list_for_each_entry_safe(addr, temp, |
| 799 | &net->sctp.local_addr_list, list) { |
| 800 | if (addr->a.sa.sa_family == AF_INET && |
| 801 | addr->a.v4.sin_addr.s_addr == |
| 802 | ifa->ifa_local) { |
| 803 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); |
| 804 | found = 1; |
| 805 | addr->valid = 0; |
| 806 | list_del_rcu(&addr->list); |
| 807 | break; |
| 808 | } |
| 809 | } |
| 810 | spin_unlock_bh(&net->sctp.local_addr_lock); |
| 811 | if (found) |
| 812 | kfree_rcu(addr, rcu); |
| 813 | break; |
| 814 | } |
| 815 | |
| 816 | return NOTIFY_DONE; |
| 817 | } |
| 818 | |
| 819 | /* |
| 820 | * Initialize the control inode/socket with a control endpoint data |
| 821 | * structure. This endpoint is reserved exclusively for the OOTB processing. |
| 822 | */ |
| 823 | static int sctp_ctl_sock_init(struct net *net) |
| 824 | { |
| 825 | int err; |
| 826 | sa_family_t family = PF_INET; |
| 827 | |
| 828 | if (sctp_get_pf_specific(PF_INET6)) |
| 829 | family = PF_INET6; |
| 830 | |
| 831 | err = inet_ctl_sock_create(&net->sctp.ctl_sock, family, |
| 832 | SOCK_SEQPACKET, IPPROTO_SCTP, net); |
| 833 | |
| 834 | /* If IPv6 socket could not be created, try the IPv4 socket */ |
| 835 | if (err < 0 && family == PF_INET6) |
| 836 | err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET, |
| 837 | SOCK_SEQPACKET, IPPROTO_SCTP, |
| 838 | net); |
| 839 | |
| 840 | if (err < 0) { |
| 841 | pr_err("Failed to create the SCTP control socket\n"); |
| 842 | return err; |
| 843 | } |
| 844 | return 0; |
| 845 | } |
| 846 | |
| 847 | /* Register address family specific functions. */ |
| 848 | int sctp_register_af(struct sctp_af *af) |
| 849 | { |
| 850 | switch (af->sa_family) { |
| 851 | case AF_INET: |
| 852 | if (sctp_af_v4_specific) |
| 853 | return 0; |
| 854 | sctp_af_v4_specific = af; |
| 855 | break; |
| 856 | case AF_INET6: |
| 857 | if (sctp_af_v6_specific) |
| 858 | return 0; |
| 859 | sctp_af_v6_specific = af; |
| 860 | break; |
| 861 | default: |
| 862 | return 0; |
| 863 | } |
| 864 | |
| 865 | INIT_LIST_HEAD(&af->list); |
| 866 | list_add_tail(&af->list, &sctp_address_families); |
| 867 | return 1; |
| 868 | } |
| 869 | |
| 870 | /* Get the table of functions for manipulating a particular address |
| 871 | * family. |
| 872 | */ |
| 873 | struct sctp_af *sctp_get_af_specific(sa_family_t family) |
| 874 | { |
| 875 | switch (family) { |
| 876 | case AF_INET: |
| 877 | return sctp_af_v4_specific; |
| 878 | case AF_INET6: |
| 879 | return sctp_af_v6_specific; |
| 880 | default: |
| 881 | return NULL; |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | /* Common code to initialize a AF_INET msg_name. */ |
| 886 | static void sctp_inet_msgname(char *msgname, int *addr_len) |
| 887 | { |
| 888 | struct sockaddr_in *sin; |
| 889 | |
| 890 | sin = (struct sockaddr_in *)msgname; |
| 891 | *addr_len = sizeof(struct sockaddr_in); |
| 892 | sin->sin_family = AF_INET; |
| 893 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| 894 | } |
| 895 | |
| 896 | /* Copy the primary address of the peer primary address as the msg_name. */ |
| 897 | static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, |
| 898 | int *addr_len) |
| 899 | { |
| 900 | struct sockaddr_in *sin, *sinfrom; |
| 901 | |
| 902 | if (msgname) { |
| 903 | struct sctp_association *asoc; |
| 904 | |
| 905 | asoc = event->asoc; |
| 906 | sctp_inet_msgname(msgname, addr_len); |
| 907 | sin = (struct sockaddr_in *)msgname; |
| 908 | sinfrom = &asoc->peer.primary_addr.v4; |
| 909 | sin->sin_port = htons(asoc->peer.port); |
| 910 | sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | /* Initialize and copy out a msgname from an inbound skb. */ |
| 915 | static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) |
| 916 | { |
| 917 | if (msgname) { |
| 918 | struct sctphdr *sh = sctp_hdr(skb); |
| 919 | struct sockaddr_in *sin = (struct sockaddr_in *)msgname; |
| 920 | |
| 921 | sctp_inet_msgname(msgname, len); |
| 922 | sin->sin_port = sh->source; |
| 923 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| 924 | } |
| 925 | } |
| 926 | |
| 927 | /* Do we support this AF? */ |
| 928 | static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) |
| 929 | { |
| 930 | /* PF_INET only supports AF_INET addresses. */ |
| 931 | return AF_INET == family; |
| 932 | } |
| 933 | |
| 934 | /* Address matching with wildcards allowed. */ |
| 935 | static int sctp_inet_cmp_addr(const union sctp_addr *addr1, |
| 936 | const union sctp_addr *addr2, |
| 937 | struct sctp_sock *opt) |
| 938 | { |
| 939 | /* PF_INET only supports AF_INET addresses. */ |
| 940 | if (addr1->sa.sa_family != addr2->sa.sa_family) |
| 941 | return 0; |
| 942 | if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || |
| 943 | htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) |
| 944 | return 1; |
| 945 | if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) |
| 946 | return 1; |
| 947 | |
| 948 | return 0; |
| 949 | } |
| 950 | |
| 951 | /* Verify that provided sockaddr looks bindable. Common verification has |
| 952 | * already been taken care of. |
| 953 | */ |
| 954 | static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) |
| 955 | { |
| 956 | return sctp_v4_available(addr, opt); |
| 957 | } |
| 958 | |
| 959 | /* Verify that sockaddr looks sendable. Common verification has already |
| 960 | * been taken care of. |
| 961 | */ |
| 962 | static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) |
| 963 | { |
| 964 | return 1; |
| 965 | } |
| 966 | |
| 967 | /* Fill in Supported Address Type information for INIT and INIT-ACK |
| 968 | * chunks. Returns number of addresses supported. |
| 969 | */ |
| 970 | static int sctp_inet_supported_addrs(const struct sctp_sock *opt, |
| 971 | __be16 *types) |
| 972 | { |
| 973 | types[0] = SCTP_PARAM_IPV4_ADDRESS; |
| 974 | return 1; |
| 975 | } |
| 976 | |
| 977 | /* Wrapper routine that calls the ip transmit routine. */ |
| 978 | static inline int sctp_v4_xmit(struct sk_buff *skb, |
| 979 | struct sctp_transport *transport) |
| 980 | { |
| 981 | struct inet_sock *inet = inet_sk(skb->sk); |
| 982 | |
| 983 | pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb, |
| 984 | skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr); |
| 985 | |
| 986 | inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? |
| 987 | IP_PMTUDISC_DO : IP_PMTUDISC_DONT; |
| 988 | |
| 989 | SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS); |
| 990 | |
| 991 | return ip_queue_xmit(&inet->sk, skb, &transport->fl); |
| 992 | } |
| 993 | |
| 994 | static struct sctp_af sctp_af_inet; |
| 995 | |
| 996 | static struct sctp_pf sctp_pf_inet = { |
| 997 | .event_msgname = sctp_inet_event_msgname, |
| 998 | .skb_msgname = sctp_inet_skb_msgname, |
| 999 | .af_supported = sctp_inet_af_supported, |
| 1000 | .cmp_addr = sctp_inet_cmp_addr, |
| 1001 | .bind_verify = sctp_inet_bind_verify, |
| 1002 | .send_verify = sctp_inet_send_verify, |
| 1003 | .supported_addrs = sctp_inet_supported_addrs, |
| 1004 | .create_accept_sk = sctp_v4_create_accept_sk, |
| 1005 | .addr_to_user = sctp_v4_addr_to_user, |
| 1006 | .to_sk_saddr = sctp_v4_to_sk_saddr, |
| 1007 | .to_sk_daddr = sctp_v4_to_sk_daddr, |
| 1008 | .af = &sctp_af_inet |
| 1009 | }; |
| 1010 | |
| 1011 | /* Notifier for inetaddr addition/deletion events. */ |
| 1012 | static struct notifier_block sctp_inetaddr_notifier = { |
| 1013 | .notifier_call = sctp_inetaddr_event, |
| 1014 | }; |
| 1015 | |
| 1016 | /* Socket operations. */ |
| 1017 | static const struct proto_ops inet_seqpacket_ops = { |
| 1018 | .family = PF_INET, |
| 1019 | .owner = THIS_MODULE, |
| 1020 | .release = inet_release, /* Needs to be wrapped... */ |
| 1021 | .bind = inet_bind, |
| 1022 | .connect = inet_dgram_connect, |
| 1023 | .socketpair = sock_no_socketpair, |
| 1024 | .accept = inet_accept, |
| 1025 | .getname = inet_getname, /* Semantics are different. */ |
| 1026 | .poll = sctp_poll, |
| 1027 | .ioctl = inet_ioctl, |
| 1028 | .listen = sctp_inet_listen, |
| 1029 | .shutdown = inet_shutdown, /* Looks harmless. */ |
| 1030 | .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ |
| 1031 | .getsockopt = sock_common_getsockopt, |
| 1032 | .sendmsg = inet_sendmsg, |
| 1033 | .recvmsg = inet_recvmsg, |
| 1034 | .mmap = sock_no_mmap, |
| 1035 | .sendpage = sock_no_sendpage, |
| 1036 | #ifdef CONFIG_COMPAT |
| 1037 | .compat_setsockopt = compat_sock_common_setsockopt, |
| 1038 | .compat_getsockopt = compat_sock_common_getsockopt, |
| 1039 | #endif |
| 1040 | }; |
| 1041 | |
| 1042 | /* Registration with AF_INET family. */ |
| 1043 | static struct inet_protosw sctp_seqpacket_protosw = { |
| 1044 | .type = SOCK_SEQPACKET, |
| 1045 | .protocol = IPPROTO_SCTP, |
| 1046 | .prot = &sctp_prot, |
| 1047 | .ops = &inet_seqpacket_ops, |
| 1048 | .flags = SCTP_PROTOSW_FLAG |
| 1049 | }; |
| 1050 | static struct inet_protosw sctp_stream_protosw = { |
| 1051 | .type = SOCK_STREAM, |
| 1052 | .protocol = IPPROTO_SCTP, |
| 1053 | .prot = &sctp_prot, |
| 1054 | .ops = &inet_seqpacket_ops, |
| 1055 | .flags = SCTP_PROTOSW_FLAG |
| 1056 | }; |
| 1057 | |
| 1058 | /* Register with IP layer. */ |
| 1059 | static const struct net_protocol sctp_protocol = { |
| 1060 | .handler = sctp_rcv, |
| 1061 | .err_handler = sctp_v4_err, |
| 1062 | .no_policy = 1, |
| 1063 | .netns_ok = 1, |
| 1064 | .icmp_strict_tag_validation = 1, |
| 1065 | }; |
| 1066 | |
| 1067 | /* IPv4 address related functions. */ |
| 1068 | static struct sctp_af sctp_af_inet = { |
| 1069 | .sa_family = AF_INET, |
| 1070 | .sctp_xmit = sctp_v4_xmit, |
| 1071 | .setsockopt = ip_setsockopt, |
| 1072 | .getsockopt = ip_getsockopt, |
| 1073 | .get_dst = sctp_v4_get_dst, |
| 1074 | .get_saddr = sctp_v4_get_saddr, |
| 1075 | .copy_addrlist = sctp_v4_copy_addrlist, |
| 1076 | .from_skb = sctp_v4_from_skb, |
| 1077 | .from_sk = sctp_v4_from_sk, |
| 1078 | .from_addr_param = sctp_v4_from_addr_param, |
| 1079 | .to_addr_param = sctp_v4_to_addr_param, |
| 1080 | .cmp_addr = sctp_v4_cmp_addr, |
| 1081 | .addr_valid = sctp_v4_addr_valid, |
| 1082 | .inaddr_any = sctp_v4_inaddr_any, |
| 1083 | .is_any = sctp_v4_is_any, |
| 1084 | .available = sctp_v4_available, |
| 1085 | .scope = sctp_v4_scope, |
| 1086 | .skb_iif = sctp_v4_skb_iif, |
| 1087 | .is_ce = sctp_v4_is_ce, |
| 1088 | .seq_dump_addr = sctp_v4_seq_dump_addr, |
| 1089 | .ecn_capable = sctp_v4_ecn_capable, |
| 1090 | .net_header_len = sizeof(struct iphdr), |
| 1091 | .sockaddr_len = sizeof(struct sockaddr_in), |
| 1092 | #ifdef CONFIG_COMPAT |
| 1093 | .compat_setsockopt = compat_ip_setsockopt, |
| 1094 | .compat_getsockopt = compat_ip_getsockopt, |
| 1095 | #endif |
| 1096 | }; |
| 1097 | |
| 1098 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family) |
| 1099 | { |
| 1100 | switch (family) { |
| 1101 | case PF_INET: |
| 1102 | return sctp_pf_inet_specific; |
| 1103 | case PF_INET6: |
| 1104 | return sctp_pf_inet6_specific; |
| 1105 | default: |
| 1106 | return NULL; |
| 1107 | } |
| 1108 | } |
| 1109 | |
| 1110 | /* Register the PF specific function table. */ |
| 1111 | int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) |
| 1112 | { |
| 1113 | switch (family) { |
| 1114 | case PF_INET: |
| 1115 | if (sctp_pf_inet_specific) |
| 1116 | return 0; |
| 1117 | sctp_pf_inet_specific = pf; |
| 1118 | break; |
| 1119 | case PF_INET6: |
| 1120 | if (sctp_pf_inet6_specific) |
| 1121 | return 0; |
| 1122 | sctp_pf_inet6_specific = pf; |
| 1123 | break; |
| 1124 | default: |
| 1125 | return 0; |
| 1126 | } |
| 1127 | return 1; |
| 1128 | } |
| 1129 | |
| 1130 | static inline int init_sctp_mibs(struct net *net) |
| 1131 | { |
| 1132 | net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib); |
| 1133 | if (!net->sctp.sctp_statistics) |
| 1134 | return -ENOMEM; |
| 1135 | return 0; |
| 1136 | } |
| 1137 | |
| 1138 | static inline void cleanup_sctp_mibs(struct net *net) |
| 1139 | { |
| 1140 | free_percpu(net->sctp.sctp_statistics); |
| 1141 | } |
| 1142 | |
| 1143 | static void sctp_v4_pf_init(void) |
| 1144 | { |
| 1145 | /* Initialize the SCTP specific PF functions. */ |
| 1146 | sctp_register_pf(&sctp_pf_inet, PF_INET); |
| 1147 | sctp_register_af(&sctp_af_inet); |
| 1148 | } |
| 1149 | |
| 1150 | static void sctp_v4_pf_exit(void) |
| 1151 | { |
| 1152 | list_del(&sctp_af_inet.list); |
| 1153 | } |
| 1154 | |
| 1155 | static int sctp_v4_protosw_init(void) |
| 1156 | { |
| 1157 | int rc; |
| 1158 | |
| 1159 | rc = proto_register(&sctp_prot, 1); |
| 1160 | if (rc) |
| 1161 | return rc; |
| 1162 | |
| 1163 | /* Register SCTP(UDP and TCP style) with socket layer. */ |
| 1164 | inet_register_protosw(&sctp_seqpacket_protosw); |
| 1165 | inet_register_protosw(&sctp_stream_protosw); |
| 1166 | |
| 1167 | return 0; |
| 1168 | } |
| 1169 | |
| 1170 | static void sctp_v4_protosw_exit(void) |
| 1171 | { |
| 1172 | inet_unregister_protosw(&sctp_stream_protosw); |
| 1173 | inet_unregister_protosw(&sctp_seqpacket_protosw); |
| 1174 | proto_unregister(&sctp_prot); |
| 1175 | } |
| 1176 | |
| 1177 | static int sctp_v4_add_protocol(void) |
| 1178 | { |
| 1179 | /* Register notifier for inet address additions/deletions. */ |
| 1180 | register_inetaddr_notifier(&sctp_inetaddr_notifier); |
| 1181 | |
| 1182 | /* Register SCTP with inet layer. */ |
| 1183 | if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) |
| 1184 | return -EAGAIN; |
| 1185 | |
| 1186 | return 0; |
| 1187 | } |
| 1188 | |
| 1189 | static void sctp_v4_del_protocol(void) |
| 1190 | { |
| 1191 | inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); |
| 1192 | unregister_inetaddr_notifier(&sctp_inetaddr_notifier); |
| 1193 | } |
| 1194 | |
| 1195 | static int __net_init sctp_defaults_init(struct net *net) |
| 1196 | { |
| 1197 | int status; |
| 1198 | |
| 1199 | /* |
| 1200 | * 14. Suggested SCTP Protocol Parameter Values |
| 1201 | */ |
| 1202 | /* The following protocol parameters are RECOMMENDED: */ |
| 1203 | /* RTO.Initial - 3 seconds */ |
| 1204 | net->sctp.rto_initial = SCTP_RTO_INITIAL; |
| 1205 | /* RTO.Min - 1 second */ |
| 1206 | net->sctp.rto_min = SCTP_RTO_MIN; |
| 1207 | /* RTO.Max - 60 seconds */ |
| 1208 | net->sctp.rto_max = SCTP_RTO_MAX; |
| 1209 | /* RTO.Alpha - 1/8 */ |
| 1210 | net->sctp.rto_alpha = SCTP_RTO_ALPHA; |
| 1211 | /* RTO.Beta - 1/4 */ |
| 1212 | net->sctp.rto_beta = SCTP_RTO_BETA; |
| 1213 | |
| 1214 | /* Valid.Cookie.Life - 60 seconds */ |
| 1215 | net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; |
| 1216 | |
| 1217 | /* Whether Cookie Preservative is enabled(1) or not(0) */ |
| 1218 | net->sctp.cookie_preserve_enable = 1; |
| 1219 | |
| 1220 | /* Default sctp sockets to use md5 as their hmac alg */ |
| 1221 | #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5) |
| 1222 | net->sctp.sctp_hmac_alg = "md5"; |
| 1223 | #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1) |
| 1224 | net->sctp.sctp_hmac_alg = "sha1"; |
| 1225 | #else |
| 1226 | net->sctp.sctp_hmac_alg = NULL; |
| 1227 | #endif |
| 1228 | |
| 1229 | /* Max.Burst - 4 */ |
| 1230 | net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST; |
| 1231 | |
| 1232 | /* Enable pf state by default */ |
| 1233 | net->sctp.pf_enable = 1; |
| 1234 | |
| 1235 | /* Association.Max.Retrans - 10 attempts |
| 1236 | * Path.Max.Retrans - 5 attempts (per destination address) |
| 1237 | * Max.Init.Retransmits - 8 attempts |
| 1238 | */ |
| 1239 | net->sctp.max_retrans_association = 10; |
| 1240 | net->sctp.max_retrans_path = 5; |
| 1241 | net->sctp.max_retrans_init = 8; |
| 1242 | |
| 1243 | /* Sendbuffer growth - do per-socket accounting */ |
| 1244 | net->sctp.sndbuf_policy = 0; |
| 1245 | |
| 1246 | /* Rcvbuffer growth - do per-socket accounting */ |
| 1247 | net->sctp.rcvbuf_policy = 0; |
| 1248 | |
| 1249 | /* HB.interval - 30 seconds */ |
| 1250 | net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; |
| 1251 | |
| 1252 | /* delayed SACK timeout */ |
| 1253 | net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; |
| 1254 | |
| 1255 | /* Disable ADDIP by default. */ |
| 1256 | net->sctp.addip_enable = 0; |
| 1257 | net->sctp.addip_noauth = 0; |
| 1258 | net->sctp.default_auto_asconf = 0; |
| 1259 | |
| 1260 | /* Enable PR-SCTP by default. */ |
| 1261 | net->sctp.prsctp_enable = 1; |
| 1262 | |
| 1263 | /* Disable RECONF by default. */ |
| 1264 | net->sctp.reconf_enable = 0; |
| 1265 | |
| 1266 | /* Disable AUTH by default. */ |
| 1267 | net->sctp.auth_enable = 0; |
| 1268 | |
| 1269 | /* Set SCOPE policy to enabled */ |
| 1270 | net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE; |
| 1271 | |
| 1272 | /* Set the default rwnd update threshold */ |
| 1273 | net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; |
| 1274 | |
| 1275 | /* Initialize maximum autoclose timeout. */ |
| 1276 | net->sctp.max_autoclose = INT_MAX / HZ; |
| 1277 | |
| 1278 | status = sctp_sysctl_net_register(net); |
| 1279 | if (status) |
| 1280 | goto err_sysctl_register; |
| 1281 | |
| 1282 | /* Allocate and initialise sctp mibs. */ |
| 1283 | status = init_sctp_mibs(net); |
| 1284 | if (status) |
| 1285 | goto err_init_mibs; |
| 1286 | |
| 1287 | /* Initialize proc fs directory. */ |
| 1288 | status = sctp_proc_init(net); |
| 1289 | if (status) |
| 1290 | goto err_init_proc; |
| 1291 | |
| 1292 | sctp_dbg_objcnt_init(net); |
| 1293 | |
| 1294 | /* Initialize the local address list. */ |
| 1295 | INIT_LIST_HEAD(&net->sctp.local_addr_list); |
| 1296 | spin_lock_init(&net->sctp.local_addr_lock); |
| 1297 | sctp_get_local_addr_list(net); |
| 1298 | |
| 1299 | /* Initialize the address event list */ |
| 1300 | INIT_LIST_HEAD(&net->sctp.addr_waitq); |
| 1301 | INIT_LIST_HEAD(&net->sctp.auto_asconf_splist); |
| 1302 | spin_lock_init(&net->sctp.addr_wq_lock); |
| 1303 | net->sctp.addr_wq_timer.expires = 0; |
| 1304 | setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, |
| 1305 | (unsigned long)net); |
| 1306 | |
| 1307 | return 0; |
| 1308 | |
| 1309 | err_init_proc: |
| 1310 | cleanup_sctp_mibs(net); |
| 1311 | err_init_mibs: |
| 1312 | sctp_sysctl_net_unregister(net); |
| 1313 | err_sysctl_register: |
| 1314 | return status; |
| 1315 | } |
| 1316 | |
| 1317 | static void __net_exit sctp_defaults_exit(struct net *net) |
| 1318 | { |
| 1319 | /* Free the local address list */ |
| 1320 | sctp_free_addr_wq(net); |
| 1321 | sctp_free_local_addr_list(net); |
| 1322 | |
| 1323 | sctp_dbg_objcnt_exit(net); |
| 1324 | |
| 1325 | sctp_proc_exit(net); |
| 1326 | cleanup_sctp_mibs(net); |
| 1327 | sctp_sysctl_net_unregister(net); |
| 1328 | } |
| 1329 | |
| 1330 | static struct pernet_operations sctp_defaults_ops = { |
| 1331 | .init = sctp_defaults_init, |
| 1332 | .exit = sctp_defaults_exit, |
| 1333 | }; |
| 1334 | |
| 1335 | static int __net_init sctp_ctrlsock_init(struct net *net) |
| 1336 | { |
| 1337 | int status; |
| 1338 | |
| 1339 | /* Initialize the control inode/socket for handling OOTB packets. */ |
| 1340 | status = sctp_ctl_sock_init(net); |
| 1341 | if (status) |
| 1342 | pr_err("Failed to initialize the SCTP control sock\n"); |
| 1343 | |
| 1344 | return status; |
| 1345 | } |
| 1346 | |
| 1347 | static void __net_init sctp_ctrlsock_exit(struct net *net) |
| 1348 | { |
| 1349 | /* Free the control endpoint. */ |
| 1350 | inet_ctl_sock_destroy(net->sctp.ctl_sock); |
| 1351 | } |
| 1352 | |
| 1353 | static struct pernet_operations sctp_ctrlsock_ops = { |
| 1354 | .init = sctp_ctrlsock_init, |
| 1355 | .exit = sctp_ctrlsock_exit, |
| 1356 | }; |
| 1357 | |
| 1358 | /* Initialize the universe into something sensible. */ |
| 1359 | static __init int sctp_init(void) |
| 1360 | { |
| 1361 | int i; |
| 1362 | int status = -EINVAL; |
| 1363 | unsigned long goal; |
| 1364 | unsigned long limit; |
| 1365 | int max_share; |
| 1366 | int order; |
| 1367 | int num_entries; |
| 1368 | int max_entry_order; |
| 1369 | |
| 1370 | sock_skb_cb_check_size(sizeof(struct sctp_ulpevent)); |
| 1371 | |
| 1372 | /* Allocate bind_bucket and chunk caches. */ |
| 1373 | status = -ENOBUFS; |
| 1374 | sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", |
| 1375 | sizeof(struct sctp_bind_bucket), |
| 1376 | 0, SLAB_HWCACHE_ALIGN, |
| 1377 | NULL); |
| 1378 | if (!sctp_bucket_cachep) |
| 1379 | goto out; |
| 1380 | |
| 1381 | sctp_chunk_cachep = kmem_cache_create("sctp_chunk", |
| 1382 | sizeof(struct sctp_chunk), |
| 1383 | 0, SLAB_HWCACHE_ALIGN, |
| 1384 | NULL); |
| 1385 | if (!sctp_chunk_cachep) |
| 1386 | goto err_chunk_cachep; |
| 1387 | |
| 1388 | status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL); |
| 1389 | if (status) |
| 1390 | goto err_percpu_counter_init; |
| 1391 | |
| 1392 | /* Implementation specific variables. */ |
| 1393 | |
| 1394 | /* Initialize default stream count setup information. */ |
| 1395 | sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; |
| 1396 | sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; |
| 1397 | |
| 1398 | /* Initialize handle used for association ids. */ |
| 1399 | idr_init(&sctp_assocs_id); |
| 1400 | |
| 1401 | limit = nr_free_buffer_pages() / 8; |
| 1402 | limit = max(limit, 128UL); |
| 1403 | sysctl_sctp_mem[0] = limit / 4 * 3; |
| 1404 | sysctl_sctp_mem[1] = limit; |
| 1405 | sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; |
| 1406 | |
| 1407 | /* Set per-socket limits to no more than 1/128 the pressure threshold*/ |
| 1408 | limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); |
| 1409 | max_share = min(4UL*1024*1024, limit); |
| 1410 | |
| 1411 | sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ |
| 1412 | sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1); |
| 1413 | sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); |
| 1414 | |
| 1415 | sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; |
| 1416 | sysctl_sctp_wmem[1] = 16*1024; |
| 1417 | sysctl_sctp_wmem[2] = max(64*1024, max_share); |
| 1418 | |
| 1419 | /* Size and allocate the association hash table. |
| 1420 | * The methodology is similar to that of the tcp hash tables. |
| 1421 | * Though not identical. Start by getting a goal size |
| 1422 | */ |
| 1423 | if (totalram_pages >= (128 * 1024)) |
| 1424 | goal = totalram_pages >> (22 - PAGE_SHIFT); |
| 1425 | else |
| 1426 | goal = totalram_pages >> (24 - PAGE_SHIFT); |
| 1427 | |
| 1428 | /* Then compute the page order for said goal */ |
| 1429 | order = get_order(goal); |
| 1430 | |
| 1431 | /* Now compute the required page order for the maximum sized table we |
| 1432 | * want to create |
| 1433 | */ |
| 1434 | max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES * |
| 1435 | sizeof(struct sctp_bind_hashbucket)); |
| 1436 | |
| 1437 | /* Limit the page order by that maximum hash table size */ |
| 1438 | order = min(order, max_entry_order); |
| 1439 | |
| 1440 | /* Allocate and initialize the endpoint hash table. */ |
| 1441 | sctp_ep_hashsize = 64; |
| 1442 | sctp_ep_hashtable = |
| 1443 | kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); |
| 1444 | if (!sctp_ep_hashtable) { |
| 1445 | pr_err("Failed endpoint_hash alloc\n"); |
| 1446 | status = -ENOMEM; |
| 1447 | goto err_ehash_alloc; |
| 1448 | } |
| 1449 | for (i = 0; i < sctp_ep_hashsize; i++) { |
| 1450 | rwlock_init(&sctp_ep_hashtable[i].lock); |
| 1451 | INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); |
| 1452 | } |
| 1453 | |
| 1454 | /* Allocate and initialize the SCTP port hash table. |
| 1455 | * Note that order is initalized to start at the max sized |
| 1456 | * table we want to support. If we can't get that many pages |
| 1457 | * reduce the order and try again |
| 1458 | */ |
| 1459 | do { |
| 1460 | sctp_port_hashtable = (struct sctp_bind_hashbucket *) |
| 1461 | __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order); |
| 1462 | } while (!sctp_port_hashtable && --order > 0); |
| 1463 | |
| 1464 | if (!sctp_port_hashtable) { |
| 1465 | pr_err("Failed bind hash alloc\n"); |
| 1466 | status = -ENOMEM; |
| 1467 | goto err_bhash_alloc; |
| 1468 | } |
| 1469 | |
| 1470 | /* Now compute the number of entries that will fit in the |
| 1471 | * port hash space we allocated |
| 1472 | */ |
| 1473 | num_entries = (1UL << order) * PAGE_SIZE / |
| 1474 | sizeof(struct sctp_bind_hashbucket); |
| 1475 | |
| 1476 | /* And finish by rounding it down to the nearest power of two |
| 1477 | * this wastes some memory of course, but its needed because |
| 1478 | * the hash function operates based on the assumption that |
| 1479 | * that the number of entries is a power of two |
| 1480 | */ |
| 1481 | sctp_port_hashsize = rounddown_pow_of_two(num_entries); |
| 1482 | |
| 1483 | for (i = 0; i < sctp_port_hashsize; i++) { |
| 1484 | spin_lock_init(&sctp_port_hashtable[i].lock); |
| 1485 | INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); |
| 1486 | } |
| 1487 | |
| 1488 | status = sctp_transport_hashtable_init(); |
| 1489 | if (status) |
| 1490 | goto err_thash_alloc; |
| 1491 | |
| 1492 | pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize, |
| 1493 | num_entries); |
| 1494 | |
| 1495 | sctp_sysctl_register(); |
| 1496 | |
| 1497 | INIT_LIST_HEAD(&sctp_address_families); |
| 1498 | sctp_v4_pf_init(); |
| 1499 | sctp_v6_pf_init(); |
| 1500 | |
| 1501 | status = register_pernet_subsys(&sctp_defaults_ops); |
| 1502 | if (status) |
| 1503 | goto err_register_defaults; |
| 1504 | |
| 1505 | status = sctp_v4_protosw_init(); |
| 1506 | if (status) |
| 1507 | goto err_protosw_init; |
| 1508 | |
| 1509 | status = sctp_v6_protosw_init(); |
| 1510 | if (status) |
| 1511 | goto err_v6_protosw_init; |
| 1512 | |
| 1513 | status = register_pernet_subsys(&sctp_ctrlsock_ops); |
| 1514 | if (status) |
| 1515 | goto err_register_ctrlsock; |
| 1516 | |
| 1517 | status = sctp_v4_add_protocol(); |
| 1518 | if (status) |
| 1519 | goto err_add_protocol; |
| 1520 | |
| 1521 | /* Register SCTP with inet6 layer. */ |
| 1522 | status = sctp_v6_add_protocol(); |
| 1523 | if (status) |
| 1524 | goto err_v6_add_protocol; |
| 1525 | |
| 1526 | if (sctp_offload_init() < 0) |
| 1527 | pr_crit("%s: Cannot add SCTP protocol offload\n", __func__); |
| 1528 | |
| 1529 | out: |
| 1530 | return status; |
| 1531 | err_v6_add_protocol: |
| 1532 | sctp_v4_del_protocol(); |
| 1533 | err_add_protocol: |
| 1534 | unregister_pernet_subsys(&sctp_ctrlsock_ops); |
| 1535 | err_register_ctrlsock: |
| 1536 | sctp_v6_protosw_exit(); |
| 1537 | err_v6_protosw_init: |
| 1538 | sctp_v4_protosw_exit(); |
| 1539 | err_protosw_init: |
| 1540 | unregister_pernet_subsys(&sctp_defaults_ops); |
| 1541 | err_register_defaults: |
| 1542 | sctp_v4_pf_exit(); |
| 1543 | sctp_v6_pf_exit(); |
| 1544 | sctp_sysctl_unregister(); |
| 1545 | free_pages((unsigned long)sctp_port_hashtable, |
| 1546 | get_order(sctp_port_hashsize * |
| 1547 | sizeof(struct sctp_bind_hashbucket))); |
| 1548 | err_bhash_alloc: |
| 1549 | sctp_transport_hashtable_destroy(); |
| 1550 | err_thash_alloc: |
| 1551 | kfree(sctp_ep_hashtable); |
| 1552 | err_ehash_alloc: |
| 1553 | percpu_counter_destroy(&sctp_sockets_allocated); |
| 1554 | err_percpu_counter_init: |
| 1555 | kmem_cache_destroy(sctp_chunk_cachep); |
| 1556 | err_chunk_cachep: |
| 1557 | kmem_cache_destroy(sctp_bucket_cachep); |
| 1558 | goto out; |
| 1559 | } |
| 1560 | |
| 1561 | /* Exit handler for the SCTP protocol. */ |
| 1562 | static __exit void sctp_exit(void) |
| 1563 | { |
| 1564 | /* BUG. This should probably do something useful like clean |
| 1565 | * up all the remaining associations and all that memory. |
| 1566 | */ |
| 1567 | |
| 1568 | /* Unregister with inet6/inet layers. */ |
| 1569 | sctp_v6_del_protocol(); |
| 1570 | sctp_v4_del_protocol(); |
| 1571 | |
| 1572 | unregister_pernet_subsys(&sctp_ctrlsock_ops); |
| 1573 | |
| 1574 | /* Free protosw registrations */ |
| 1575 | sctp_v6_protosw_exit(); |
| 1576 | sctp_v4_protosw_exit(); |
| 1577 | |
| 1578 | unregister_pernet_subsys(&sctp_defaults_ops); |
| 1579 | |
| 1580 | /* Unregister with socket layer. */ |
| 1581 | sctp_v6_pf_exit(); |
| 1582 | sctp_v4_pf_exit(); |
| 1583 | |
| 1584 | sctp_sysctl_unregister(); |
| 1585 | |
| 1586 | free_pages((unsigned long)sctp_port_hashtable, |
| 1587 | get_order(sctp_port_hashsize * |
| 1588 | sizeof(struct sctp_bind_hashbucket))); |
| 1589 | kfree(sctp_ep_hashtable); |
| 1590 | sctp_transport_hashtable_destroy(); |
| 1591 | |
| 1592 | percpu_counter_destroy(&sctp_sockets_allocated); |
| 1593 | |
| 1594 | rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
| 1595 | |
| 1596 | kmem_cache_destroy(sctp_chunk_cachep); |
| 1597 | kmem_cache_destroy(sctp_bucket_cachep); |
| 1598 | } |
| 1599 | |
| 1600 | module_init(sctp_init); |
| 1601 | module_exit(sctp_exit); |
| 1602 | |
| 1603 | /* |
| 1604 | * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. |
| 1605 | */ |
| 1606 | MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); |
| 1607 | MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); |
| 1608 | MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>"); |
| 1609 | MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); |
| 1610 | module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); |
| 1611 | MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); |
| 1612 | MODULE_LICENSE("GPL"); |