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, 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@us.ibm.com> 41 * Sridhar Samudrala <sri@us.ibm.com> 42 * Daisy Chang <daisyc@us.ibm.com> 43 * Ardelle Fan <ardelle.fan@intel.com> 44 * 45 * Any bugs reported given to us we will try to fix... any fixes shared will 46 * be incorporated into the next SCTP release. 47 */ 48 49 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 50 51 #include <linux/module.h> 52 #include <linux/init.h> 53 #include <linux/netdevice.h> 54 #include <linux/inetdevice.h> 55 #include <linux/seq_file.h> 56 #include <linux/bootmem.h> 57 #include <linux/highmem.h> 58 #include <linux/swap.h> 59 #include <linux/slab.h> 60 #include <net/net_namespace.h> 61 #include <net/protocol.h> 62 #include <net/ip.h> 63 #include <net/ipv6.h> 64 #include <net/route.h> 65 #include <net/sctp/sctp.h> 66 #include <net/addrconf.h> 67 #include <net/inet_common.h> 68 #include <net/inet_ecn.h> 69 70 /* Global data structures. */ 71 struct sctp_globals sctp_globals __read_mostly; 72 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; 73 74 #ifdef CONFIG_PROC_FS 75 struct proc_dir_entry *proc_net_sctp; 76 #endif 77 78 struct idr sctp_assocs_id; 79 DEFINE_SPINLOCK(sctp_assocs_id_lock); 80 81 /* This is the global socket data structure used for responding to 82 * the Out-of-the-blue (OOTB) packets. A control sock will be created 83 * for this socket at the initialization time. 84 */ 85 static struct sock *sctp_ctl_sock; 86 87 static struct sctp_pf *sctp_pf_inet6_specific; 88 static struct sctp_pf *sctp_pf_inet_specific; 89 static struct sctp_af *sctp_af_v4_specific; 90 static struct sctp_af *sctp_af_v6_specific; 91 92 struct kmem_cache *sctp_chunk_cachep __read_mostly; 93 struct kmem_cache *sctp_bucket_cachep __read_mostly; 94 95 long sysctl_sctp_mem[3]; 96 int sysctl_sctp_rmem[3]; 97 int sysctl_sctp_wmem[3]; 98 99 /* Return the address of the control sock. */ 100 struct sock *sctp_get_ctl_sock(void) 101 { 102 return sctp_ctl_sock; 103 } 104 105 /* Set up the proc fs entry for the SCTP protocol. */ 106 static __init int sctp_proc_init(void) 107 { 108 if (percpu_counter_init(&sctp_sockets_allocated, 0)) 109 goto out_nomem; 110 #ifdef CONFIG_PROC_FS 111 if (!proc_net_sctp) { 112 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net); 113 if (!proc_net_sctp) 114 goto out_free_percpu; 115 } 116 117 if (sctp_snmp_proc_init()) 118 goto out_snmp_proc_init; 119 if (sctp_eps_proc_init()) 120 goto out_eps_proc_init; 121 if (sctp_assocs_proc_init()) 122 goto out_assocs_proc_init; 123 if (sctp_remaddr_proc_init()) 124 goto out_remaddr_proc_init; 125 126 return 0; 127 128 out_remaddr_proc_init: 129 sctp_assocs_proc_exit(); 130 out_assocs_proc_init: 131 sctp_eps_proc_exit(); 132 out_eps_proc_init: 133 sctp_snmp_proc_exit(); 134 out_snmp_proc_init: 135 if (proc_net_sctp) { 136 proc_net_sctp = NULL; 137 remove_proc_entry("sctp", init_net.proc_net); 138 } 139 out_free_percpu: 140 percpu_counter_destroy(&sctp_sockets_allocated); 141 #else 142 return 0; 143 #endif /* CONFIG_PROC_FS */ 144 145 out_nomem: 146 return -ENOMEM; 147 } 148 149 /* Clean up the proc fs entry for the SCTP protocol. 150 * Note: Do not make this __exit as it is used in the init error 151 * path. 152 */ 153 static void sctp_proc_exit(void) 154 { 155 #ifdef CONFIG_PROC_FS 156 sctp_snmp_proc_exit(); 157 sctp_eps_proc_exit(); 158 sctp_assocs_proc_exit(); 159 sctp_remaddr_proc_exit(); 160 161 if (proc_net_sctp) { 162 proc_net_sctp = NULL; 163 remove_proc_entry("sctp", init_net.proc_net); 164 } 165 #endif 166 percpu_counter_destroy(&sctp_sockets_allocated); 167 } 168 169 /* Private helper to extract ipv4 address and stash them in 170 * the protocol structure. 171 */ 172 static void sctp_v4_copy_addrlist(struct list_head *addrlist, 173 struct net_device *dev) 174 { 175 struct in_device *in_dev; 176 struct in_ifaddr *ifa; 177 struct sctp_sockaddr_entry *addr; 178 179 rcu_read_lock(); 180 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 181 rcu_read_unlock(); 182 return; 183 } 184 185 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 186 /* Add the address to the local list. */ 187 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 188 if (addr) { 189 addr->a.v4.sin_family = AF_INET; 190 addr->a.v4.sin_port = 0; 191 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 192 addr->valid = 1; 193 INIT_LIST_HEAD(&addr->list); 194 list_add_tail(&addr->list, addrlist); 195 } 196 } 197 198 rcu_read_unlock(); 199 } 200 201 /* Extract our IP addresses from the system and stash them in the 202 * protocol structure. 203 */ 204 static void sctp_get_local_addr_list(void) 205 { 206 struct net_device *dev; 207 struct list_head *pos; 208 struct sctp_af *af; 209 210 rcu_read_lock(); 211 for_each_netdev_rcu(&init_net, dev) { 212 __list_for_each(pos, &sctp_address_families) { 213 af = list_entry(pos, struct sctp_af, list); 214 af->copy_addrlist(&sctp_local_addr_list, dev); 215 } 216 } 217 rcu_read_unlock(); 218 } 219 220 /* Free the existing local addresses. */ 221 static void sctp_free_local_addr_list(void) 222 { 223 struct sctp_sockaddr_entry *addr; 224 struct list_head *pos, *temp; 225 226 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 227 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 228 list_del(pos); 229 kfree(addr); 230 } 231 } 232 233 void sctp_local_addr_free(struct rcu_head *head) 234 { 235 struct sctp_sockaddr_entry *e = container_of(head, 236 struct sctp_sockaddr_entry, rcu); 237 kfree(e); 238 } 239 240 /* Copy the local addresses which are valid for 'scope' into 'bp'. */ 241 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, 242 gfp_t gfp, int copy_flags) 243 { 244 struct sctp_sockaddr_entry *addr; 245 int error = 0; 246 247 rcu_read_lock(); 248 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { 249 if (!addr->valid) 250 continue; 251 if (sctp_in_scope(&addr->a, scope)) { 252 /* Now that the address is in scope, check to see if 253 * the address type is really supported by the local 254 * sock as well as the remote peer. 255 */ 256 if ((((AF_INET == addr->a.sa.sa_family) && 257 (copy_flags & SCTP_ADDR4_PEERSUPP))) || 258 (((AF_INET6 == addr->a.sa.sa_family) && 259 (copy_flags & SCTP_ADDR6_ALLOWED) && 260 (copy_flags & SCTP_ADDR6_PEERSUPP)))) { 261 error = sctp_add_bind_addr(bp, &addr->a, 262 SCTP_ADDR_SRC, GFP_ATOMIC); 263 if (error) 264 goto end_copy; 265 } 266 } 267 } 268 269 end_copy: 270 rcu_read_unlock(); 271 return error; 272 } 273 274 /* Initialize a sctp_addr from in incoming skb. */ 275 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 276 int is_saddr) 277 { 278 void *from; 279 __be16 *port; 280 struct sctphdr *sh; 281 282 port = &addr->v4.sin_port; 283 addr->v4.sin_family = AF_INET; 284 285 sh = sctp_hdr(skb); 286 if (is_saddr) { 287 *port = sh->source; 288 from = &ip_hdr(skb)->saddr; 289 } else { 290 *port = sh->dest; 291 from = &ip_hdr(skb)->daddr; 292 } 293 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); 294 } 295 296 /* Initialize an sctp_addr from a socket. */ 297 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 298 { 299 addr->v4.sin_family = AF_INET; 300 addr->v4.sin_port = 0; 301 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; 302 } 303 304 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 305 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 306 { 307 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; 308 } 309 310 /* Initialize sk->sk_daddr from sctp_addr. */ 311 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 312 { 313 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; 314 } 315 316 /* Initialize a sctp_addr from an address parameter. */ 317 static void sctp_v4_from_addr_param(union sctp_addr *addr, 318 union sctp_addr_param *param, 319 __be16 port, int iif) 320 { 321 addr->v4.sin_family = AF_INET; 322 addr->v4.sin_port = port; 323 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 324 } 325 326 /* Initialize an address parameter from a sctp_addr and return the length 327 * of the address parameter. 328 */ 329 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 330 union sctp_addr_param *param) 331 { 332 int length = sizeof(sctp_ipv4addr_param_t); 333 334 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 335 param->v4.param_hdr.length = htons(length); 336 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 337 338 return length; 339 } 340 341 /* Initialize a sctp_addr from a dst_entry. */ 342 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, 343 __be16 port) 344 { 345 struct rtable *rt = (struct rtable *)dst; 346 saddr->v4.sin_family = AF_INET; 347 saddr->v4.sin_port = port; 348 saddr->v4.sin_addr.s_addr = rt->rt_src; 349 } 350 351 /* Compare two addresses exactly. */ 352 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 353 const union sctp_addr *addr2) 354 { 355 if (addr1->sa.sa_family != addr2->sa.sa_family) 356 return 0; 357 if (addr1->v4.sin_port != addr2->v4.sin_port) 358 return 0; 359 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 360 return 0; 361 362 return 1; 363 } 364 365 /* Initialize addr struct to INADDR_ANY. */ 366 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 367 { 368 addr->v4.sin_family = AF_INET; 369 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 370 addr->v4.sin_port = port; 371 } 372 373 /* Is this a wildcard address? */ 374 static int sctp_v4_is_any(const union sctp_addr *addr) 375 { 376 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 377 } 378 379 /* This function checks if the address is a valid address to be used for 380 * SCTP binding. 381 * 382 * Output: 383 * Return 0 - If the address is a non-unicast or an illegal address. 384 * Return 1 - If the address is a unicast. 385 */ 386 static int sctp_v4_addr_valid(union sctp_addr *addr, 387 struct sctp_sock *sp, 388 const struct sk_buff *skb) 389 { 390 /* IPv4 addresses not allowed */ 391 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 392 return 0; 393 394 /* Is this a non-unicast address or a unusable SCTP address? */ 395 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 396 return 0; 397 398 /* Is this a broadcast address? */ 399 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) 400 return 0; 401 402 return 1; 403 } 404 405 /* Should this be available for binding? */ 406 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 407 { 408 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); 409 410 411 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 412 ret != RTN_LOCAL && 413 !sp->inet.freebind && 414 !sysctl_ip_nonlocal_bind) 415 return 0; 416 417 if (ipv6_only_sock(sctp_opt2sk(sp))) 418 return 0; 419 420 return 1; 421 } 422 423 /* Checking the loopback, private and other address scopes as defined in 424 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 425 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 426 * 427 * Level 0 - unusable SCTP addresses 428 * Level 1 - loopback address 429 * Level 2 - link-local addresses 430 * Level 3 - private addresses. 431 * Level 4 - global addresses 432 * For INIT and INIT-ACK address list, let L be the level of 433 * of requested destination address, sender and receiver 434 * SHOULD include all of its addresses with level greater 435 * than or equal to L. 436 * 437 * IPv4 scoping can be controlled through sysctl option 438 * net.sctp.addr_scope_policy 439 */ 440 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 441 { 442 sctp_scope_t retval; 443 444 /* Check for unusable SCTP addresses. */ 445 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 446 retval = SCTP_SCOPE_UNUSABLE; 447 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 448 retval = SCTP_SCOPE_LOOPBACK; 449 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 450 retval = SCTP_SCOPE_LINK; 451 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 452 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 453 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { 454 retval = SCTP_SCOPE_PRIVATE; 455 } else { 456 retval = SCTP_SCOPE_GLOBAL; 457 } 458 459 return retval; 460 } 461 462 /* Returns a valid dst cache entry for the given source and destination ip 463 * addresses. If an association is passed, trys to get a dst entry with a 464 * source address that matches an address in the bind address list. 465 */ 466 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, 467 union sctp_addr *daddr, 468 union sctp_addr *saddr) 469 { 470 struct rtable *rt; 471 struct flowi4 fl4; 472 struct sctp_bind_addr *bp; 473 struct sctp_sockaddr_entry *laddr; 474 struct dst_entry *dst = NULL; 475 union sctp_addr dst_saddr; 476 477 memset(&fl4, 0x0, sizeof(struct flowi4)); 478 fl4.daddr = daddr->v4.sin_addr.s_addr; 479 fl4.fl4_dport = daddr->v4.sin_port; 480 fl4.flowi4_proto = IPPROTO_SCTP; 481 if (asoc) { 482 fl4.flowi4_tos = RT_CONN_FLAGS(asoc->base.sk); 483 fl4.flowi4_oif = asoc->base.sk->sk_bound_dev_if; 484 fl4.fl4_sport = htons(asoc->base.bind_addr.port); 485 } 486 if (saddr) { 487 fl4.saddr = saddr->v4.sin_addr.s_addr; 488 fl4.fl4_sport = saddr->v4.sin_port; 489 } 490 491 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", 492 __func__, &fl4.daddr, &fl4.saddr); 493 494 rt = ip_route_output_key(&init_net, &fl4); 495 if (!IS_ERR(rt)) 496 dst = &rt->dst; 497 498 /* If there is no association or if a source address is passed, no 499 * more validation is required. 500 */ 501 if (!asoc || saddr) 502 goto out; 503 504 bp = &asoc->base.bind_addr; 505 506 if (dst) { 507 /* Walk through the bind address list and look for a bind 508 * address that matches the source address of the returned dst. 509 */ 510 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); 511 rcu_read_lock(); 512 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 513 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) 514 continue; 515 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 516 goto out_unlock; 517 } 518 rcu_read_unlock(); 519 520 /* None of the bound addresses match the source address of the 521 * dst. So release it. 522 */ 523 dst_release(dst); 524 dst = NULL; 525 } 526 527 /* Walk through the bind address list and try to get a dst that 528 * matches a bind address as the source address. 529 */ 530 rcu_read_lock(); 531 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 532 if (!laddr->valid) 533 continue; 534 if ((laddr->state == SCTP_ADDR_SRC) && 535 (AF_INET == laddr->a.sa.sa_family)) { 536 fl4.saddr = laddr->a.v4.sin_addr.s_addr; 537 fl4.fl4_sport = laddr->a.v4.sin_port; 538 rt = ip_route_output_key(&init_net, &fl4); 539 if (!IS_ERR(rt)) { 540 dst = &rt->dst; 541 goto out_unlock; 542 } 543 } 544 } 545 546 out_unlock: 547 rcu_read_unlock(); 548 out: 549 if (dst) 550 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", 551 &rt->rt_dst, &rt->rt_src); 552 else 553 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 554 555 return dst; 556 } 557 558 /* For v4, the source address is cached in the route entry(dst). So no need 559 * to cache it separately and hence this is an empty routine. 560 */ 561 static void sctp_v4_get_saddr(struct sctp_sock *sk, 562 struct sctp_association *asoc, 563 struct dst_entry *dst, 564 union sctp_addr *daddr, 565 union sctp_addr *saddr) 566 { 567 struct rtable *rt = (struct rtable *)dst; 568 569 if (!asoc) 570 return; 571 572 if (rt) { 573 saddr->v4.sin_family = AF_INET; 574 saddr->v4.sin_port = htons(asoc->base.bind_addr.port); 575 saddr->v4.sin_addr.s_addr = rt->rt_src; 576 } 577 } 578 579 /* What interface did this skb arrive on? */ 580 static int sctp_v4_skb_iif(const struct sk_buff *skb) 581 { 582 return skb_rtable(skb)->rt_iif; 583 } 584 585 /* Was this packet marked by Explicit Congestion Notification? */ 586 static int sctp_v4_is_ce(const struct sk_buff *skb) 587 { 588 return INET_ECN_is_ce(ip_hdr(skb)->tos); 589 } 590 591 /* Create and initialize a new sk for the socket returned by accept(). */ 592 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 593 struct sctp_association *asoc) 594 { 595 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 596 sk->sk_prot); 597 struct inet_sock *newinet; 598 599 if (!newsk) 600 goto out; 601 602 sock_init_data(NULL, newsk); 603 604 sctp_copy_sock(newsk, sk, asoc); 605 sock_reset_flag(newsk, SOCK_ZAPPED); 606 607 newinet = inet_sk(newsk); 608 609 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 610 611 sk_refcnt_debug_inc(newsk); 612 613 if (newsk->sk_prot->init(newsk)) { 614 sk_common_release(newsk); 615 newsk = NULL; 616 } 617 618 out: 619 return newsk; 620 } 621 622 /* Map address, empty for v4 family */ 623 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 624 { 625 /* Empty */ 626 } 627 628 /* Dump the v4 addr to the seq file. */ 629 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 630 { 631 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 632 } 633 634 static void sctp_v4_ecn_capable(struct sock *sk) 635 { 636 INET_ECN_xmit(sk); 637 } 638 639 /* Event handler for inet address addition/deletion events. 640 * The sctp_local_addr_list needs to be protocted by a spin lock since 641 * multiple notifiers (say IPv4 and IPv6) may be running at the same 642 * time and thus corrupt the list. 643 * The reader side is protected with RCU. 644 */ 645 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 646 void *ptr) 647 { 648 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 649 struct sctp_sockaddr_entry *addr = NULL; 650 struct sctp_sockaddr_entry *temp; 651 int found = 0; 652 653 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net)) 654 return NOTIFY_DONE; 655 656 switch (ev) { 657 case NETDEV_UP: 658 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 659 if (addr) { 660 addr->a.v4.sin_family = AF_INET; 661 addr->a.v4.sin_port = 0; 662 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 663 addr->valid = 1; 664 spin_lock_bh(&sctp_local_addr_lock); 665 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 666 spin_unlock_bh(&sctp_local_addr_lock); 667 } 668 break; 669 case NETDEV_DOWN: 670 spin_lock_bh(&sctp_local_addr_lock); 671 list_for_each_entry_safe(addr, temp, 672 &sctp_local_addr_list, list) { 673 if (addr->a.sa.sa_family == AF_INET && 674 addr->a.v4.sin_addr.s_addr == 675 ifa->ifa_local) { 676 found = 1; 677 addr->valid = 0; 678 list_del_rcu(&addr->list); 679 break; 680 } 681 } 682 spin_unlock_bh(&sctp_local_addr_lock); 683 if (found) 684 call_rcu(&addr->rcu, sctp_local_addr_free); 685 break; 686 } 687 688 return NOTIFY_DONE; 689 } 690 691 /* 692 * Initialize the control inode/socket with a control endpoint data 693 * structure. This endpoint is reserved exclusively for the OOTB processing. 694 */ 695 static int sctp_ctl_sock_init(void) 696 { 697 int err; 698 sa_family_t family = PF_INET; 699 700 if (sctp_get_pf_specific(PF_INET6)) 701 family = PF_INET6; 702 703 err = inet_ctl_sock_create(&sctp_ctl_sock, family, 704 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); 705 706 /* If IPv6 socket could not be created, try the IPv4 socket */ 707 if (err < 0 && family == PF_INET6) 708 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET, 709 SOCK_SEQPACKET, IPPROTO_SCTP, 710 &init_net); 711 712 if (err < 0) { 713 pr_err("Failed to create the SCTP control socket\n"); 714 return err; 715 } 716 return 0; 717 } 718 719 /* Register address family specific functions. */ 720 int sctp_register_af(struct sctp_af *af) 721 { 722 switch (af->sa_family) { 723 case AF_INET: 724 if (sctp_af_v4_specific) 725 return 0; 726 sctp_af_v4_specific = af; 727 break; 728 case AF_INET6: 729 if (sctp_af_v6_specific) 730 return 0; 731 sctp_af_v6_specific = af; 732 break; 733 default: 734 return 0; 735 } 736 737 INIT_LIST_HEAD(&af->list); 738 list_add_tail(&af->list, &sctp_address_families); 739 return 1; 740 } 741 742 /* Get the table of functions for manipulating a particular address 743 * family. 744 */ 745 struct sctp_af *sctp_get_af_specific(sa_family_t family) 746 { 747 switch (family) { 748 case AF_INET: 749 return sctp_af_v4_specific; 750 case AF_INET6: 751 return sctp_af_v6_specific; 752 default: 753 return NULL; 754 } 755 } 756 757 /* Common code to initialize a AF_INET msg_name. */ 758 static void sctp_inet_msgname(char *msgname, int *addr_len) 759 { 760 struct sockaddr_in *sin; 761 762 sin = (struct sockaddr_in *)msgname; 763 *addr_len = sizeof(struct sockaddr_in); 764 sin->sin_family = AF_INET; 765 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 766 } 767 768 /* Copy the primary address of the peer primary address as the msg_name. */ 769 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 770 int *addr_len) 771 { 772 struct sockaddr_in *sin, *sinfrom; 773 774 if (msgname) { 775 struct sctp_association *asoc; 776 777 asoc = event->asoc; 778 sctp_inet_msgname(msgname, addr_len); 779 sin = (struct sockaddr_in *)msgname; 780 sinfrom = &asoc->peer.primary_addr.v4; 781 sin->sin_port = htons(asoc->peer.port); 782 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 783 } 784 } 785 786 /* Initialize and copy out a msgname from an inbound skb. */ 787 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 788 { 789 if (msgname) { 790 struct sctphdr *sh = sctp_hdr(skb); 791 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 792 793 sctp_inet_msgname(msgname, len); 794 sin->sin_port = sh->source; 795 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 796 } 797 } 798 799 /* Do we support this AF? */ 800 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 801 { 802 /* PF_INET only supports AF_INET addresses. */ 803 return AF_INET == family; 804 } 805 806 /* Address matching with wildcards allowed. */ 807 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 808 const union sctp_addr *addr2, 809 struct sctp_sock *opt) 810 { 811 /* PF_INET only supports AF_INET addresses. */ 812 if (addr1->sa.sa_family != addr2->sa.sa_family) 813 return 0; 814 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 815 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 816 return 1; 817 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 818 return 1; 819 820 return 0; 821 } 822 823 /* Verify that provided sockaddr looks bindable. Common verification has 824 * already been taken care of. 825 */ 826 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 827 { 828 return sctp_v4_available(addr, opt); 829 } 830 831 /* Verify that sockaddr looks sendable. Common verification has already 832 * been taken care of. 833 */ 834 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 835 { 836 return 1; 837 } 838 839 /* Fill in Supported Address Type information for INIT and INIT-ACK 840 * chunks. Returns number of addresses supported. 841 */ 842 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 843 __be16 *types) 844 { 845 types[0] = SCTP_PARAM_IPV4_ADDRESS; 846 return 1; 847 } 848 849 /* Wrapper routine that calls the ip transmit routine. */ 850 static inline int sctp_v4_xmit(struct sk_buff *skb, 851 struct sctp_transport *transport) 852 { 853 struct inet_sock *inet = inet_sk(skb->sk); 854 855 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", 856 __func__, skb, skb->len, 857 &skb_rtable(skb)->rt_src, 858 &skb_rtable(skb)->rt_dst); 859 860 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 861 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 862 863 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 864 return ip_queue_xmit(skb); 865 } 866 867 static struct sctp_af sctp_af_inet; 868 869 static struct sctp_pf sctp_pf_inet = { 870 .event_msgname = sctp_inet_event_msgname, 871 .skb_msgname = sctp_inet_skb_msgname, 872 .af_supported = sctp_inet_af_supported, 873 .cmp_addr = sctp_inet_cmp_addr, 874 .bind_verify = sctp_inet_bind_verify, 875 .send_verify = sctp_inet_send_verify, 876 .supported_addrs = sctp_inet_supported_addrs, 877 .create_accept_sk = sctp_v4_create_accept_sk, 878 .addr_v4map = sctp_v4_addr_v4map, 879 .af = &sctp_af_inet 880 }; 881 882 /* Notifier for inetaddr addition/deletion events. */ 883 static struct notifier_block sctp_inetaddr_notifier = { 884 .notifier_call = sctp_inetaddr_event, 885 }; 886 887 /* Socket operations. */ 888 static const struct proto_ops inet_seqpacket_ops = { 889 .family = PF_INET, 890 .owner = THIS_MODULE, 891 .release = inet_release, /* Needs to be wrapped... */ 892 .bind = inet_bind, 893 .connect = inet_dgram_connect, 894 .socketpair = sock_no_socketpair, 895 .accept = inet_accept, 896 .getname = inet_getname, /* Semantics are different. */ 897 .poll = sctp_poll, 898 .ioctl = inet_ioctl, 899 .listen = sctp_inet_listen, 900 .shutdown = inet_shutdown, /* Looks harmless. */ 901 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 902 .getsockopt = sock_common_getsockopt, 903 .sendmsg = inet_sendmsg, 904 .recvmsg = sock_common_recvmsg, 905 .mmap = sock_no_mmap, 906 .sendpage = sock_no_sendpage, 907 #ifdef CONFIG_COMPAT 908 .compat_setsockopt = compat_sock_common_setsockopt, 909 .compat_getsockopt = compat_sock_common_getsockopt, 910 #endif 911 }; 912 913 /* Registration with AF_INET family. */ 914 static struct inet_protosw sctp_seqpacket_protosw = { 915 .type = SOCK_SEQPACKET, 916 .protocol = IPPROTO_SCTP, 917 .prot = &sctp_prot, 918 .ops = &inet_seqpacket_ops, 919 .no_check = 0, 920 .flags = SCTP_PROTOSW_FLAG 921 }; 922 static struct inet_protosw sctp_stream_protosw = { 923 .type = SOCK_STREAM, 924 .protocol = IPPROTO_SCTP, 925 .prot = &sctp_prot, 926 .ops = &inet_seqpacket_ops, 927 .no_check = 0, 928 .flags = SCTP_PROTOSW_FLAG 929 }; 930 931 /* Register with IP layer. */ 932 static const struct net_protocol sctp_protocol = { 933 .handler = sctp_rcv, 934 .err_handler = sctp_v4_err, 935 .no_policy = 1, 936 }; 937 938 /* IPv4 address related functions. */ 939 static struct sctp_af sctp_af_inet = { 940 .sa_family = AF_INET, 941 .sctp_xmit = sctp_v4_xmit, 942 .setsockopt = ip_setsockopt, 943 .getsockopt = ip_getsockopt, 944 .get_dst = sctp_v4_get_dst, 945 .get_saddr = sctp_v4_get_saddr, 946 .copy_addrlist = sctp_v4_copy_addrlist, 947 .from_skb = sctp_v4_from_skb, 948 .from_sk = sctp_v4_from_sk, 949 .to_sk_saddr = sctp_v4_to_sk_saddr, 950 .to_sk_daddr = sctp_v4_to_sk_daddr, 951 .from_addr_param = sctp_v4_from_addr_param, 952 .to_addr_param = sctp_v4_to_addr_param, 953 .dst_saddr = sctp_v4_dst_saddr, 954 .cmp_addr = sctp_v4_cmp_addr, 955 .addr_valid = sctp_v4_addr_valid, 956 .inaddr_any = sctp_v4_inaddr_any, 957 .is_any = sctp_v4_is_any, 958 .available = sctp_v4_available, 959 .scope = sctp_v4_scope, 960 .skb_iif = sctp_v4_skb_iif, 961 .is_ce = sctp_v4_is_ce, 962 .seq_dump_addr = sctp_v4_seq_dump_addr, 963 .ecn_capable = sctp_v4_ecn_capable, 964 .net_header_len = sizeof(struct iphdr), 965 .sockaddr_len = sizeof(struct sockaddr_in), 966 #ifdef CONFIG_COMPAT 967 .compat_setsockopt = compat_ip_setsockopt, 968 .compat_getsockopt = compat_ip_getsockopt, 969 #endif 970 }; 971 972 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 973 974 switch (family) { 975 case PF_INET: 976 return sctp_pf_inet_specific; 977 case PF_INET6: 978 return sctp_pf_inet6_specific; 979 default: 980 return NULL; 981 } 982 } 983 984 /* Register the PF specific function table. */ 985 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 986 { 987 switch (family) { 988 case PF_INET: 989 if (sctp_pf_inet_specific) 990 return 0; 991 sctp_pf_inet_specific = pf; 992 break; 993 case PF_INET6: 994 if (sctp_pf_inet6_specific) 995 return 0; 996 sctp_pf_inet6_specific = pf; 997 break; 998 default: 999 return 0; 1000 } 1001 return 1; 1002 } 1003 1004 static inline int init_sctp_mibs(void) 1005 { 1006 return snmp_mib_init((void __percpu **)sctp_statistics, 1007 sizeof(struct sctp_mib), 1008 __alignof__(struct sctp_mib)); 1009 } 1010 1011 static inline void cleanup_sctp_mibs(void) 1012 { 1013 snmp_mib_free((void __percpu **)sctp_statistics); 1014 } 1015 1016 static void sctp_v4_pf_init(void) 1017 { 1018 /* Initialize the SCTP specific PF functions. */ 1019 sctp_register_pf(&sctp_pf_inet, PF_INET); 1020 sctp_register_af(&sctp_af_inet); 1021 } 1022 1023 static void sctp_v4_pf_exit(void) 1024 { 1025 list_del(&sctp_af_inet.list); 1026 } 1027 1028 static int sctp_v4_protosw_init(void) 1029 { 1030 int rc; 1031 1032 rc = proto_register(&sctp_prot, 1); 1033 if (rc) 1034 return rc; 1035 1036 /* Register SCTP(UDP and TCP style) with socket layer. */ 1037 inet_register_protosw(&sctp_seqpacket_protosw); 1038 inet_register_protosw(&sctp_stream_protosw); 1039 1040 return 0; 1041 } 1042 1043 static void sctp_v4_protosw_exit(void) 1044 { 1045 inet_unregister_protosw(&sctp_stream_protosw); 1046 inet_unregister_protosw(&sctp_seqpacket_protosw); 1047 proto_unregister(&sctp_prot); 1048 } 1049 1050 static int sctp_v4_add_protocol(void) 1051 { 1052 /* Register notifier for inet address additions/deletions. */ 1053 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1054 1055 /* Register SCTP with inet layer. */ 1056 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1057 return -EAGAIN; 1058 1059 return 0; 1060 } 1061 1062 static void sctp_v4_del_protocol(void) 1063 { 1064 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1065 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1066 } 1067 1068 /* Initialize the universe into something sensible. */ 1069 SCTP_STATIC __init int sctp_init(void) 1070 { 1071 int i; 1072 int status = -EINVAL; 1073 unsigned long goal; 1074 unsigned long limit; 1075 unsigned long nr_pages; 1076 int max_share; 1077 int order; 1078 1079 /* SCTP_DEBUG sanity check. */ 1080 if (!sctp_sanity_check()) 1081 goto out; 1082 1083 /* Allocate bind_bucket and chunk caches. */ 1084 status = -ENOBUFS; 1085 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1086 sizeof(struct sctp_bind_bucket), 1087 0, SLAB_HWCACHE_ALIGN, 1088 NULL); 1089 if (!sctp_bucket_cachep) 1090 goto out; 1091 1092 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1093 sizeof(struct sctp_chunk), 1094 0, SLAB_HWCACHE_ALIGN, 1095 NULL); 1096 if (!sctp_chunk_cachep) 1097 goto err_chunk_cachep; 1098 1099 /* Allocate and initialise sctp mibs. */ 1100 status = init_sctp_mibs(); 1101 if (status) 1102 goto err_init_mibs; 1103 1104 /* Initialize proc fs directory. */ 1105 status = sctp_proc_init(); 1106 if (status) 1107 goto err_init_proc; 1108 1109 /* Initialize object count debugging. */ 1110 sctp_dbg_objcnt_init(); 1111 1112 /* 1113 * 14. Suggested SCTP Protocol Parameter Values 1114 */ 1115 /* The following protocol parameters are RECOMMENDED: */ 1116 /* RTO.Initial - 3 seconds */ 1117 sctp_rto_initial = SCTP_RTO_INITIAL; 1118 /* RTO.Min - 1 second */ 1119 sctp_rto_min = SCTP_RTO_MIN; 1120 /* RTO.Max - 60 seconds */ 1121 sctp_rto_max = SCTP_RTO_MAX; 1122 /* RTO.Alpha - 1/8 */ 1123 sctp_rto_alpha = SCTP_RTO_ALPHA; 1124 /* RTO.Beta - 1/4 */ 1125 sctp_rto_beta = SCTP_RTO_BETA; 1126 1127 /* Valid.Cookie.Life - 60 seconds */ 1128 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1129 1130 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1131 sctp_cookie_preserve_enable = 1; 1132 1133 /* Max.Burst - 4 */ 1134 sctp_max_burst = SCTP_DEFAULT_MAX_BURST; 1135 1136 /* Association.Max.Retrans - 10 attempts 1137 * Path.Max.Retrans - 5 attempts (per destination address) 1138 * Max.Init.Retransmits - 8 attempts 1139 */ 1140 sctp_max_retrans_association = 10; 1141 sctp_max_retrans_path = 5; 1142 sctp_max_retrans_init = 8; 1143 1144 /* Sendbuffer growth - do per-socket accounting */ 1145 sctp_sndbuf_policy = 0; 1146 1147 /* Rcvbuffer growth - do per-socket accounting */ 1148 sctp_rcvbuf_policy = 0; 1149 1150 /* HB.interval - 30 seconds */ 1151 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1152 1153 /* delayed SACK timeout */ 1154 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1155 1156 /* Implementation specific variables. */ 1157 1158 /* Initialize default stream count setup information. */ 1159 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1160 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1161 1162 /* Initialize handle used for association ids. */ 1163 idr_init(&sctp_assocs_id); 1164 1165 /* Set the pressure threshold to be a fraction of global memory that 1166 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of 1167 * memory, with a floor of 128 pages. 1168 * Note this initializes the data in sctpv6_prot too 1169 * Unabashedly stolen from tcp_init 1170 */ 1171 nr_pages = totalram_pages - totalhigh_pages; 1172 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); 1173 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); 1174 limit = max(limit, 128UL); 1175 sysctl_sctp_mem[0] = limit / 4 * 3; 1176 sysctl_sctp_mem[1] = limit; 1177 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1178 1179 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1180 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1181 max_share = min(4UL*1024*1024, limit); 1182 1183 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1184 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); 1185 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1186 1187 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1188 sysctl_sctp_wmem[1] = 16*1024; 1189 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1190 1191 /* Size and allocate the association hash table. 1192 * The methodology is similar to that of the tcp hash tables. 1193 */ 1194 if (totalram_pages >= (128 * 1024)) 1195 goal = totalram_pages >> (22 - PAGE_SHIFT); 1196 else 1197 goal = totalram_pages >> (24 - PAGE_SHIFT); 1198 1199 for (order = 0; (1UL << order) < goal; order++) 1200 ; 1201 1202 do { 1203 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1204 sizeof(struct sctp_hashbucket); 1205 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1206 continue; 1207 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1208 __get_free_pages(GFP_ATOMIC, order); 1209 } while (!sctp_assoc_hashtable && --order > 0); 1210 if (!sctp_assoc_hashtable) { 1211 pr_err("Failed association hash alloc\n"); 1212 status = -ENOMEM; 1213 goto err_ahash_alloc; 1214 } 1215 for (i = 0; i < sctp_assoc_hashsize; i++) { 1216 rwlock_init(&sctp_assoc_hashtable[i].lock); 1217 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1218 } 1219 1220 /* Allocate and initialize the endpoint hash table. */ 1221 sctp_ep_hashsize = 64; 1222 sctp_ep_hashtable = (struct sctp_hashbucket *) 1223 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1224 if (!sctp_ep_hashtable) { 1225 pr_err("Failed endpoint_hash alloc\n"); 1226 status = -ENOMEM; 1227 goto err_ehash_alloc; 1228 } 1229 for (i = 0; i < sctp_ep_hashsize; i++) { 1230 rwlock_init(&sctp_ep_hashtable[i].lock); 1231 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1232 } 1233 1234 /* Allocate and initialize the SCTP port hash table. */ 1235 do { 1236 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1237 sizeof(struct sctp_bind_hashbucket); 1238 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1239 continue; 1240 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1241 __get_free_pages(GFP_ATOMIC, order); 1242 } while (!sctp_port_hashtable && --order > 0); 1243 if (!sctp_port_hashtable) { 1244 pr_err("Failed bind hash alloc\n"); 1245 status = -ENOMEM; 1246 goto err_bhash_alloc; 1247 } 1248 for (i = 0; i < sctp_port_hashsize; i++) { 1249 spin_lock_init(&sctp_port_hashtable[i].lock); 1250 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1251 } 1252 1253 pr_info("Hash tables configured (established %d bind %d)\n", 1254 sctp_assoc_hashsize, sctp_port_hashsize); 1255 1256 /* Disable ADDIP by default. */ 1257 sctp_addip_enable = 0; 1258 sctp_addip_noauth = 0; 1259 1260 /* Enable PR-SCTP by default. */ 1261 sctp_prsctp_enable = 1; 1262 1263 /* Disable AUTH by default. */ 1264 sctp_auth_enable = 0; 1265 1266 /* Set SCOPE policy to enabled */ 1267 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE; 1268 1269 /* Set the default rwnd update threshold */ 1270 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; 1271 1272 sctp_sysctl_register(); 1273 1274 INIT_LIST_HEAD(&sctp_address_families); 1275 sctp_v4_pf_init(); 1276 sctp_v6_pf_init(); 1277 1278 /* Initialize the local address list. */ 1279 INIT_LIST_HEAD(&sctp_local_addr_list); 1280 spin_lock_init(&sctp_local_addr_lock); 1281 sctp_get_local_addr_list(); 1282 1283 status = sctp_v4_protosw_init(); 1284 1285 if (status) 1286 goto err_protosw_init; 1287 1288 status = sctp_v6_protosw_init(); 1289 if (status) 1290 goto err_v6_protosw_init; 1291 1292 /* Initialize the control inode/socket for handling OOTB packets. */ 1293 if ((status = sctp_ctl_sock_init())) { 1294 pr_err("Failed to initialize the SCTP control sock\n"); 1295 goto err_ctl_sock_init; 1296 } 1297 1298 status = sctp_v4_add_protocol(); 1299 if (status) 1300 goto err_add_protocol; 1301 1302 /* Register SCTP with inet6 layer. */ 1303 status = sctp_v6_add_protocol(); 1304 if (status) 1305 goto err_v6_add_protocol; 1306 1307 status = 0; 1308 out: 1309 return status; 1310 err_v6_add_protocol: 1311 sctp_v4_del_protocol(); 1312 err_add_protocol: 1313 inet_ctl_sock_destroy(sctp_ctl_sock); 1314 err_ctl_sock_init: 1315 sctp_v6_protosw_exit(); 1316 err_v6_protosw_init: 1317 sctp_v4_protosw_exit(); 1318 err_protosw_init: 1319 sctp_free_local_addr_list(); 1320 sctp_v4_pf_exit(); 1321 sctp_v6_pf_exit(); 1322 sctp_sysctl_unregister(); 1323 free_pages((unsigned long)sctp_port_hashtable, 1324 get_order(sctp_port_hashsize * 1325 sizeof(struct sctp_bind_hashbucket))); 1326 err_bhash_alloc: 1327 kfree(sctp_ep_hashtable); 1328 err_ehash_alloc: 1329 free_pages((unsigned long)sctp_assoc_hashtable, 1330 get_order(sctp_assoc_hashsize * 1331 sizeof(struct sctp_hashbucket))); 1332 err_ahash_alloc: 1333 sctp_dbg_objcnt_exit(); 1334 sctp_proc_exit(); 1335 err_init_proc: 1336 cleanup_sctp_mibs(); 1337 err_init_mibs: 1338 kmem_cache_destroy(sctp_chunk_cachep); 1339 err_chunk_cachep: 1340 kmem_cache_destroy(sctp_bucket_cachep); 1341 goto out; 1342 } 1343 1344 /* Exit handler for the SCTP protocol. */ 1345 SCTP_STATIC __exit void sctp_exit(void) 1346 { 1347 /* BUG. This should probably do something useful like clean 1348 * up all the remaining associations and all that memory. 1349 */ 1350 1351 /* Unregister with inet6/inet layers. */ 1352 sctp_v6_del_protocol(); 1353 sctp_v4_del_protocol(); 1354 1355 /* Free the control endpoint. */ 1356 inet_ctl_sock_destroy(sctp_ctl_sock); 1357 1358 /* Free protosw registrations */ 1359 sctp_v6_protosw_exit(); 1360 sctp_v4_protosw_exit(); 1361 1362 /* Free the local address list. */ 1363 sctp_free_local_addr_list(); 1364 1365 /* Unregister with socket layer. */ 1366 sctp_v6_pf_exit(); 1367 sctp_v4_pf_exit(); 1368 1369 sctp_sysctl_unregister(); 1370 1371 free_pages((unsigned long)sctp_assoc_hashtable, 1372 get_order(sctp_assoc_hashsize * 1373 sizeof(struct sctp_hashbucket))); 1374 kfree(sctp_ep_hashtable); 1375 free_pages((unsigned long)sctp_port_hashtable, 1376 get_order(sctp_port_hashsize * 1377 sizeof(struct sctp_bind_hashbucket))); 1378 1379 sctp_dbg_objcnt_exit(); 1380 sctp_proc_exit(); 1381 cleanup_sctp_mibs(); 1382 1383 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1384 1385 kmem_cache_destroy(sctp_chunk_cachep); 1386 kmem_cache_destroy(sctp_bucket_cachep); 1387 } 1388 1389 module_init(sctp_init); 1390 module_exit(sctp_exit); 1391 1392 /* 1393 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1394 */ 1395 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1396 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1397 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1398 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1399 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1400 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1401 MODULE_LICENSE("GPL"); 1402