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 #include <linux/module.h> 50 #include <linux/init.h> 51 #include <linux/netdevice.h> 52 #include <linux/inetdevice.h> 53 #include <linux/seq_file.h> 54 #include <linux/bootmem.h> 55 #include <linux/highmem.h> 56 #include <linux/swap.h> 57 #include <net/net_namespace.h> 58 #include <net/protocol.h> 59 #include <net/ip.h> 60 #include <net/ipv6.h> 61 #include <net/route.h> 62 #include <net/sctp/sctp.h> 63 #include <net/addrconf.h> 64 #include <net/inet_common.h> 65 #include <net/inet_ecn.h> 66 67 /* Global data structures. */ 68 struct sctp_globals sctp_globals __read_mostly; 69 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; 70 71 #ifdef CONFIG_PROC_FS 72 struct proc_dir_entry *proc_net_sctp; 73 #endif 74 75 struct idr sctp_assocs_id; 76 DEFINE_SPINLOCK(sctp_assocs_id_lock); 77 78 /* This is the global socket data structure used for responding to 79 * the Out-of-the-blue (OOTB) packets. A control sock will be created 80 * for this socket at the initialization time. 81 */ 82 static struct sock *sctp_ctl_sock; 83 84 static struct sctp_pf *sctp_pf_inet6_specific; 85 static struct sctp_pf *sctp_pf_inet_specific; 86 static struct sctp_af *sctp_af_v4_specific; 87 static struct sctp_af *sctp_af_v6_specific; 88 89 struct kmem_cache *sctp_chunk_cachep __read_mostly; 90 struct kmem_cache *sctp_bucket_cachep __read_mostly; 91 92 int sysctl_sctp_mem[3]; 93 int sysctl_sctp_rmem[3]; 94 int sysctl_sctp_wmem[3]; 95 96 /* Return the address of the control sock. */ 97 struct sock *sctp_get_ctl_sock(void) 98 { 99 return sctp_ctl_sock; 100 } 101 102 /* Set up the proc fs entry for the SCTP protocol. */ 103 static __init int sctp_proc_init(void) 104 { 105 if (percpu_counter_init(&sctp_sockets_allocated, 0)) 106 goto out_nomem; 107 #ifdef CONFIG_PROC_FS 108 if (!proc_net_sctp) { 109 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net); 110 if (!proc_net_sctp) 111 goto out_free_percpu; 112 } 113 114 if (sctp_snmp_proc_init()) 115 goto out_snmp_proc_init; 116 if (sctp_eps_proc_init()) 117 goto out_eps_proc_init; 118 if (sctp_assocs_proc_init()) 119 goto out_assocs_proc_init; 120 if (sctp_remaddr_proc_init()) 121 goto out_remaddr_proc_init; 122 123 return 0; 124 125 out_remaddr_proc_init: 126 sctp_assocs_proc_exit(); 127 out_assocs_proc_init: 128 sctp_eps_proc_exit(); 129 out_eps_proc_init: 130 sctp_snmp_proc_exit(); 131 out_snmp_proc_init: 132 if (proc_net_sctp) { 133 proc_net_sctp = NULL; 134 remove_proc_entry("sctp", init_net.proc_net); 135 } 136 out_free_percpu: 137 percpu_counter_destroy(&sctp_sockets_allocated); 138 #else 139 return 0; 140 #endif /* CONFIG_PROC_FS */ 141 142 out_nomem: 143 return -ENOMEM; 144 } 145 146 /* Clean up the proc fs entry for the SCTP protocol. 147 * Note: Do not make this __exit as it is used in the init error 148 * path. 149 */ 150 static void sctp_proc_exit(void) 151 { 152 #ifdef CONFIG_PROC_FS 153 sctp_snmp_proc_exit(); 154 sctp_eps_proc_exit(); 155 sctp_assocs_proc_exit(); 156 sctp_remaddr_proc_exit(); 157 158 if (proc_net_sctp) { 159 proc_net_sctp = NULL; 160 remove_proc_entry("sctp", init_net.proc_net); 161 } 162 #endif 163 percpu_counter_destroy(&sctp_sockets_allocated); 164 } 165 166 /* Private helper to extract ipv4 address and stash them in 167 * the protocol structure. 168 */ 169 static void sctp_v4_copy_addrlist(struct list_head *addrlist, 170 struct net_device *dev) 171 { 172 struct in_device *in_dev; 173 struct in_ifaddr *ifa; 174 struct sctp_sockaddr_entry *addr; 175 176 rcu_read_lock(); 177 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 178 rcu_read_unlock(); 179 return; 180 } 181 182 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 183 /* Add the address to the local list. */ 184 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 185 if (addr) { 186 addr->a.v4.sin_family = AF_INET; 187 addr->a.v4.sin_port = 0; 188 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 189 addr->valid = 1; 190 INIT_LIST_HEAD(&addr->list); 191 list_add_tail(&addr->list, addrlist); 192 } 193 } 194 195 rcu_read_unlock(); 196 } 197 198 /* Extract our IP addresses from the system and stash them in the 199 * protocol structure. 200 */ 201 static void sctp_get_local_addr_list(void) 202 { 203 struct net_device *dev; 204 struct list_head *pos; 205 struct sctp_af *af; 206 207 rcu_read_lock(); 208 for_each_netdev_rcu(&init_net, dev) { 209 __list_for_each(pos, &sctp_address_families) { 210 af = list_entry(pos, struct sctp_af, list); 211 af->copy_addrlist(&sctp_local_addr_list, dev); 212 } 213 } 214 rcu_read_unlock(); 215 } 216 217 /* Free the existing local addresses. */ 218 static void sctp_free_local_addr_list(void) 219 { 220 struct sctp_sockaddr_entry *addr; 221 struct list_head *pos, *temp; 222 223 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 224 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 225 list_del(pos); 226 kfree(addr); 227 } 228 } 229 230 void sctp_local_addr_free(struct rcu_head *head) 231 { 232 struct sctp_sockaddr_entry *e = container_of(head, 233 struct sctp_sockaddr_entry, rcu); 234 kfree(e); 235 } 236 237 /* Copy the local addresses which are valid for 'scope' into 'bp'. */ 238 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, 239 gfp_t gfp, int copy_flags) 240 { 241 struct sctp_sockaddr_entry *addr; 242 int error = 0; 243 244 rcu_read_lock(); 245 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { 246 if (!addr->valid) 247 continue; 248 if (sctp_in_scope(&addr->a, scope)) { 249 /* Now that the address is in scope, check to see if 250 * the address type is really supported by the local 251 * sock as well as the remote peer. 252 */ 253 if ((((AF_INET == addr->a.sa.sa_family) && 254 (copy_flags & SCTP_ADDR4_PEERSUPP))) || 255 (((AF_INET6 == addr->a.sa.sa_family) && 256 (copy_flags & SCTP_ADDR6_ALLOWED) && 257 (copy_flags & SCTP_ADDR6_PEERSUPP)))) { 258 error = sctp_add_bind_addr(bp, &addr->a, 259 SCTP_ADDR_SRC, GFP_ATOMIC); 260 if (error) 261 goto end_copy; 262 } 263 } 264 } 265 266 end_copy: 267 rcu_read_unlock(); 268 return error; 269 } 270 271 /* Initialize a sctp_addr from in incoming skb. */ 272 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 273 int is_saddr) 274 { 275 void *from; 276 __be16 *port; 277 struct sctphdr *sh; 278 279 port = &addr->v4.sin_port; 280 addr->v4.sin_family = AF_INET; 281 282 sh = sctp_hdr(skb); 283 if (is_saddr) { 284 *port = sh->source; 285 from = &ip_hdr(skb)->saddr; 286 } else { 287 *port = sh->dest; 288 from = &ip_hdr(skb)->daddr; 289 } 290 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); 291 } 292 293 /* Initialize an sctp_addr from a socket. */ 294 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 295 { 296 addr->v4.sin_family = AF_INET; 297 addr->v4.sin_port = 0; 298 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; 299 } 300 301 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 302 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 303 { 304 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; 305 } 306 307 /* Initialize sk->sk_daddr from sctp_addr. */ 308 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 309 { 310 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; 311 } 312 313 /* Initialize a sctp_addr from an address parameter. */ 314 static void sctp_v4_from_addr_param(union sctp_addr *addr, 315 union sctp_addr_param *param, 316 __be16 port, int iif) 317 { 318 addr->v4.sin_family = AF_INET; 319 addr->v4.sin_port = port; 320 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 321 } 322 323 /* Initialize an address parameter from a sctp_addr and return the length 324 * of the address parameter. 325 */ 326 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 327 union sctp_addr_param *param) 328 { 329 int length = sizeof(sctp_ipv4addr_param_t); 330 331 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 332 param->v4.param_hdr.length = htons(length); 333 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 334 335 return length; 336 } 337 338 /* Initialize a sctp_addr from a dst_entry. */ 339 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, 340 __be16 port) 341 { 342 struct rtable *rt = (struct rtable *)dst; 343 saddr->v4.sin_family = AF_INET; 344 saddr->v4.sin_port = port; 345 saddr->v4.sin_addr.s_addr = rt->rt_src; 346 } 347 348 /* Compare two addresses exactly. */ 349 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 350 const union sctp_addr *addr2) 351 { 352 if (addr1->sa.sa_family != addr2->sa.sa_family) 353 return 0; 354 if (addr1->v4.sin_port != addr2->v4.sin_port) 355 return 0; 356 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 357 return 0; 358 359 return 1; 360 } 361 362 /* Initialize addr struct to INADDR_ANY. */ 363 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 364 { 365 addr->v4.sin_family = AF_INET; 366 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 367 addr->v4.sin_port = port; 368 } 369 370 /* Is this a wildcard address? */ 371 static int sctp_v4_is_any(const union sctp_addr *addr) 372 { 373 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 374 } 375 376 /* This function checks if the address is a valid address to be used for 377 * SCTP binding. 378 * 379 * Output: 380 * Return 0 - If the address is a non-unicast or an illegal address. 381 * Return 1 - If the address is a unicast. 382 */ 383 static int sctp_v4_addr_valid(union sctp_addr *addr, 384 struct sctp_sock *sp, 385 const struct sk_buff *skb) 386 { 387 /* IPv4 addresses not allowed */ 388 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 389 return 0; 390 391 /* Is this a non-unicast address or a unusable SCTP address? */ 392 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 393 return 0; 394 395 /* Is this a broadcast address? */ 396 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) 397 return 0; 398 399 return 1; 400 } 401 402 /* Should this be available for binding? */ 403 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 404 { 405 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); 406 407 408 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 409 ret != RTN_LOCAL && 410 !sp->inet.freebind && 411 !sysctl_ip_nonlocal_bind) 412 return 0; 413 414 if (ipv6_only_sock(sctp_opt2sk(sp))) 415 return 0; 416 417 return 1; 418 } 419 420 /* Checking the loopback, private and other address scopes as defined in 421 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 422 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 423 * 424 * Level 0 - unusable SCTP addresses 425 * Level 1 - loopback address 426 * Level 2 - link-local addresses 427 * Level 3 - private addresses. 428 * Level 4 - global addresses 429 * For INIT and INIT-ACK address list, let L be the level of 430 * of requested destination address, sender and receiver 431 * SHOULD include all of its addresses with level greater 432 * than or equal to L. 433 * 434 * IPv4 scoping can be controlled through sysctl option 435 * net.sctp.addr_scope_policy 436 */ 437 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 438 { 439 sctp_scope_t retval; 440 441 /* Check for unusable SCTP addresses. */ 442 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 443 retval = SCTP_SCOPE_UNUSABLE; 444 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 445 retval = SCTP_SCOPE_LOOPBACK; 446 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 447 retval = SCTP_SCOPE_LINK; 448 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 449 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 450 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { 451 retval = SCTP_SCOPE_PRIVATE; 452 } else { 453 retval = SCTP_SCOPE_GLOBAL; 454 } 455 456 return retval; 457 } 458 459 /* Returns a valid dst cache entry for the given source and destination ip 460 * addresses. If an association is passed, trys to get a dst entry with a 461 * source address that matches an address in the bind address list. 462 */ 463 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, 464 union sctp_addr *daddr, 465 union sctp_addr *saddr) 466 { 467 struct rtable *rt; 468 struct flowi fl; 469 struct sctp_bind_addr *bp; 470 struct sctp_sockaddr_entry *laddr; 471 struct dst_entry *dst = NULL; 472 union sctp_addr dst_saddr; 473 474 memset(&fl, 0x0, sizeof(struct flowi)); 475 fl.fl4_dst = daddr->v4.sin_addr.s_addr; 476 fl.proto = IPPROTO_SCTP; 477 if (asoc) { 478 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); 479 fl.oif = asoc->base.sk->sk_bound_dev_if; 480 } 481 if (saddr) 482 fl.fl4_src = saddr->v4.sin_addr.s_addr; 483 484 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", 485 __func__, &fl.fl4_dst, &fl.fl4_src); 486 487 if (!ip_route_output_key(&init_net, &rt, &fl)) { 488 dst = &rt->u.dst; 489 } 490 491 /* If there is no association or if a source address is passed, no 492 * more validation is required. 493 */ 494 if (!asoc || saddr) 495 goto out; 496 497 bp = &asoc->base.bind_addr; 498 499 if (dst) { 500 /* Walk through the bind address list and look for a bind 501 * address that matches the source address of the returned dst. 502 */ 503 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); 504 rcu_read_lock(); 505 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 506 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) 507 continue; 508 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 509 goto out_unlock; 510 } 511 rcu_read_unlock(); 512 513 /* None of the bound addresses match the source address of the 514 * dst. So release it. 515 */ 516 dst_release(dst); 517 dst = NULL; 518 } 519 520 /* Walk through the bind address list and try to get a dst that 521 * matches a bind address as the source address. 522 */ 523 rcu_read_lock(); 524 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 525 if (!laddr->valid) 526 continue; 527 if ((laddr->state == SCTP_ADDR_SRC) && 528 (AF_INET == laddr->a.sa.sa_family)) { 529 fl.fl4_src = laddr->a.v4.sin_addr.s_addr; 530 if (!ip_route_output_key(&init_net, &rt, &fl)) { 531 dst = &rt->u.dst; 532 goto out_unlock; 533 } 534 } 535 } 536 537 out_unlock: 538 rcu_read_unlock(); 539 out: 540 if (dst) 541 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", 542 &rt->rt_dst, &rt->rt_src); 543 else 544 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 545 546 return dst; 547 } 548 549 /* For v4, the source address is cached in the route entry(dst). So no need 550 * to cache it separately and hence this is an empty routine. 551 */ 552 static void sctp_v4_get_saddr(struct sctp_sock *sk, 553 struct sctp_association *asoc, 554 struct dst_entry *dst, 555 union sctp_addr *daddr, 556 union sctp_addr *saddr) 557 { 558 struct rtable *rt = (struct rtable *)dst; 559 560 if (!asoc) 561 return; 562 563 if (rt) { 564 saddr->v4.sin_family = AF_INET; 565 saddr->v4.sin_port = htons(asoc->base.bind_addr.port); 566 saddr->v4.sin_addr.s_addr = rt->rt_src; 567 } 568 } 569 570 /* What interface did this skb arrive on? */ 571 static int sctp_v4_skb_iif(const struct sk_buff *skb) 572 { 573 return skb_rtable(skb)->rt_iif; 574 } 575 576 /* Was this packet marked by Explicit Congestion Notification? */ 577 static int sctp_v4_is_ce(const struct sk_buff *skb) 578 { 579 return INET_ECN_is_ce(ip_hdr(skb)->tos); 580 } 581 582 /* Create and initialize a new sk for the socket returned by accept(). */ 583 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 584 struct sctp_association *asoc) 585 { 586 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 587 sk->sk_prot); 588 struct inet_sock *newinet; 589 590 if (!newsk) 591 goto out; 592 593 sock_init_data(NULL, newsk); 594 595 sctp_copy_sock(newsk, sk, asoc); 596 sock_reset_flag(newsk, SOCK_ZAPPED); 597 598 newinet = inet_sk(newsk); 599 600 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 601 602 sk_refcnt_debug_inc(newsk); 603 604 if (newsk->sk_prot->init(newsk)) { 605 sk_common_release(newsk); 606 newsk = NULL; 607 } 608 609 out: 610 return newsk; 611 } 612 613 /* Map address, empty for v4 family */ 614 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 615 { 616 /* Empty */ 617 } 618 619 /* Dump the v4 addr to the seq file. */ 620 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 621 { 622 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 623 } 624 625 static void sctp_v4_ecn_capable(struct sock *sk) 626 { 627 INET_ECN_xmit(sk); 628 } 629 630 /* Event handler for inet address addition/deletion events. 631 * The sctp_local_addr_list needs to be protocted by a spin lock since 632 * multiple notifiers (say IPv4 and IPv6) may be running at the same 633 * time and thus corrupt the list. 634 * The reader side is protected with RCU. 635 */ 636 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 637 void *ptr) 638 { 639 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 640 struct sctp_sockaddr_entry *addr = NULL; 641 struct sctp_sockaddr_entry *temp; 642 int found = 0; 643 644 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net)) 645 return NOTIFY_DONE; 646 647 switch (ev) { 648 case NETDEV_UP: 649 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 650 if (addr) { 651 addr->a.v4.sin_family = AF_INET; 652 addr->a.v4.sin_port = 0; 653 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 654 addr->valid = 1; 655 spin_lock_bh(&sctp_local_addr_lock); 656 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 657 spin_unlock_bh(&sctp_local_addr_lock); 658 } 659 break; 660 case NETDEV_DOWN: 661 spin_lock_bh(&sctp_local_addr_lock); 662 list_for_each_entry_safe(addr, temp, 663 &sctp_local_addr_list, list) { 664 if (addr->a.sa.sa_family == AF_INET && 665 addr->a.v4.sin_addr.s_addr == 666 ifa->ifa_local) { 667 found = 1; 668 addr->valid = 0; 669 list_del_rcu(&addr->list); 670 break; 671 } 672 } 673 spin_unlock_bh(&sctp_local_addr_lock); 674 if (found) 675 call_rcu(&addr->rcu, sctp_local_addr_free); 676 break; 677 } 678 679 return NOTIFY_DONE; 680 } 681 682 /* 683 * Initialize the control inode/socket with a control endpoint data 684 * structure. This endpoint is reserved exclusively for the OOTB processing. 685 */ 686 static int sctp_ctl_sock_init(void) 687 { 688 int err; 689 sa_family_t family = PF_INET; 690 691 if (sctp_get_pf_specific(PF_INET6)) 692 family = PF_INET6; 693 694 err = inet_ctl_sock_create(&sctp_ctl_sock, family, 695 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); 696 697 /* If IPv6 socket could not be created, try the IPv4 socket */ 698 if (err < 0 && family == PF_INET6) 699 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET, 700 SOCK_SEQPACKET, IPPROTO_SCTP, 701 &init_net); 702 703 if (err < 0) { 704 printk(KERN_ERR 705 "SCTP: Failed to create the SCTP control socket.\n"); 706 return err; 707 } 708 return 0; 709 } 710 711 /* Register address family specific functions. */ 712 int sctp_register_af(struct sctp_af *af) 713 { 714 switch (af->sa_family) { 715 case AF_INET: 716 if (sctp_af_v4_specific) 717 return 0; 718 sctp_af_v4_specific = af; 719 break; 720 case AF_INET6: 721 if (sctp_af_v6_specific) 722 return 0; 723 sctp_af_v6_specific = af; 724 break; 725 default: 726 return 0; 727 } 728 729 INIT_LIST_HEAD(&af->list); 730 list_add_tail(&af->list, &sctp_address_families); 731 return 1; 732 } 733 734 /* Get the table of functions for manipulating a particular address 735 * family. 736 */ 737 struct sctp_af *sctp_get_af_specific(sa_family_t family) 738 { 739 switch (family) { 740 case AF_INET: 741 return sctp_af_v4_specific; 742 case AF_INET6: 743 return sctp_af_v6_specific; 744 default: 745 return NULL; 746 } 747 } 748 749 /* Common code to initialize a AF_INET msg_name. */ 750 static void sctp_inet_msgname(char *msgname, int *addr_len) 751 { 752 struct sockaddr_in *sin; 753 754 sin = (struct sockaddr_in *)msgname; 755 *addr_len = sizeof(struct sockaddr_in); 756 sin->sin_family = AF_INET; 757 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 758 } 759 760 /* Copy the primary address of the peer primary address as the msg_name. */ 761 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 762 int *addr_len) 763 { 764 struct sockaddr_in *sin, *sinfrom; 765 766 if (msgname) { 767 struct sctp_association *asoc; 768 769 asoc = event->asoc; 770 sctp_inet_msgname(msgname, addr_len); 771 sin = (struct sockaddr_in *)msgname; 772 sinfrom = &asoc->peer.primary_addr.v4; 773 sin->sin_port = htons(asoc->peer.port); 774 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 775 } 776 } 777 778 /* Initialize and copy out a msgname from an inbound skb. */ 779 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 780 { 781 if (msgname) { 782 struct sctphdr *sh = sctp_hdr(skb); 783 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 784 785 sctp_inet_msgname(msgname, len); 786 sin->sin_port = sh->source; 787 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 788 } 789 } 790 791 /* Do we support this AF? */ 792 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 793 { 794 /* PF_INET only supports AF_INET addresses. */ 795 return (AF_INET == family); 796 } 797 798 /* Address matching with wildcards allowed. */ 799 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 800 const union sctp_addr *addr2, 801 struct sctp_sock *opt) 802 { 803 /* PF_INET only supports AF_INET addresses. */ 804 if (addr1->sa.sa_family != addr2->sa.sa_family) 805 return 0; 806 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 807 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 808 return 1; 809 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 810 return 1; 811 812 return 0; 813 } 814 815 /* Verify that provided sockaddr looks bindable. Common verification has 816 * already been taken care of. 817 */ 818 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 819 { 820 return sctp_v4_available(addr, opt); 821 } 822 823 /* Verify that sockaddr looks sendable. Common verification has already 824 * been taken care of. 825 */ 826 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 827 { 828 return 1; 829 } 830 831 /* Fill in Supported Address Type information for INIT and INIT-ACK 832 * chunks. Returns number of addresses supported. 833 */ 834 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 835 __be16 *types) 836 { 837 types[0] = SCTP_PARAM_IPV4_ADDRESS; 838 return 1; 839 } 840 841 /* Wrapper routine that calls the ip transmit routine. */ 842 static inline int sctp_v4_xmit(struct sk_buff *skb, 843 struct sctp_transport *transport) 844 { 845 struct inet_sock *inet = inet_sk(skb->sk); 846 847 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", 848 __func__, skb, skb->len, 849 &skb_rtable(skb)->rt_src, 850 &skb_rtable(skb)->rt_dst); 851 852 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 853 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 854 855 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 856 return ip_queue_xmit(skb, 0); 857 } 858 859 static struct sctp_af sctp_af_inet; 860 861 static struct sctp_pf sctp_pf_inet = { 862 .event_msgname = sctp_inet_event_msgname, 863 .skb_msgname = sctp_inet_skb_msgname, 864 .af_supported = sctp_inet_af_supported, 865 .cmp_addr = sctp_inet_cmp_addr, 866 .bind_verify = sctp_inet_bind_verify, 867 .send_verify = sctp_inet_send_verify, 868 .supported_addrs = sctp_inet_supported_addrs, 869 .create_accept_sk = sctp_v4_create_accept_sk, 870 .addr_v4map = sctp_v4_addr_v4map, 871 .af = &sctp_af_inet 872 }; 873 874 /* Notifier for inetaddr addition/deletion events. */ 875 static struct notifier_block sctp_inetaddr_notifier = { 876 .notifier_call = sctp_inetaddr_event, 877 }; 878 879 /* Socket operations. */ 880 static const struct proto_ops inet_seqpacket_ops = { 881 .family = PF_INET, 882 .owner = THIS_MODULE, 883 .release = inet_release, /* Needs to be wrapped... */ 884 .bind = inet_bind, 885 .connect = inet_dgram_connect, 886 .socketpair = sock_no_socketpair, 887 .accept = inet_accept, 888 .getname = inet_getname, /* Semantics are different. */ 889 .poll = sctp_poll, 890 .ioctl = inet_ioctl, 891 .listen = sctp_inet_listen, 892 .shutdown = inet_shutdown, /* Looks harmless. */ 893 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 894 .getsockopt = sock_common_getsockopt, 895 .sendmsg = inet_sendmsg, 896 .recvmsg = sock_common_recvmsg, 897 .mmap = sock_no_mmap, 898 .sendpage = sock_no_sendpage, 899 #ifdef CONFIG_COMPAT 900 .compat_setsockopt = compat_sock_common_setsockopt, 901 .compat_getsockopt = compat_sock_common_getsockopt, 902 #endif 903 }; 904 905 /* Registration with AF_INET family. */ 906 static struct inet_protosw sctp_seqpacket_protosw = { 907 .type = SOCK_SEQPACKET, 908 .protocol = IPPROTO_SCTP, 909 .prot = &sctp_prot, 910 .ops = &inet_seqpacket_ops, 911 .no_check = 0, 912 .flags = SCTP_PROTOSW_FLAG 913 }; 914 static struct inet_protosw sctp_stream_protosw = { 915 .type = SOCK_STREAM, 916 .protocol = IPPROTO_SCTP, 917 .prot = &sctp_prot, 918 .ops = &inet_seqpacket_ops, 919 .no_check = 0, 920 .flags = SCTP_PROTOSW_FLAG 921 }; 922 923 /* Register with IP layer. */ 924 static const struct net_protocol sctp_protocol = { 925 .handler = sctp_rcv, 926 .err_handler = sctp_v4_err, 927 .no_policy = 1, 928 }; 929 930 /* IPv4 address related functions. */ 931 static struct sctp_af sctp_af_inet = { 932 .sa_family = AF_INET, 933 .sctp_xmit = sctp_v4_xmit, 934 .setsockopt = ip_setsockopt, 935 .getsockopt = ip_getsockopt, 936 .get_dst = sctp_v4_get_dst, 937 .get_saddr = sctp_v4_get_saddr, 938 .copy_addrlist = sctp_v4_copy_addrlist, 939 .from_skb = sctp_v4_from_skb, 940 .from_sk = sctp_v4_from_sk, 941 .to_sk_saddr = sctp_v4_to_sk_saddr, 942 .to_sk_daddr = sctp_v4_to_sk_daddr, 943 .from_addr_param = sctp_v4_from_addr_param, 944 .to_addr_param = sctp_v4_to_addr_param, 945 .dst_saddr = sctp_v4_dst_saddr, 946 .cmp_addr = sctp_v4_cmp_addr, 947 .addr_valid = sctp_v4_addr_valid, 948 .inaddr_any = sctp_v4_inaddr_any, 949 .is_any = sctp_v4_is_any, 950 .available = sctp_v4_available, 951 .scope = sctp_v4_scope, 952 .skb_iif = sctp_v4_skb_iif, 953 .is_ce = sctp_v4_is_ce, 954 .seq_dump_addr = sctp_v4_seq_dump_addr, 955 .ecn_capable = sctp_v4_ecn_capable, 956 .net_header_len = sizeof(struct iphdr), 957 .sockaddr_len = sizeof(struct sockaddr_in), 958 #ifdef CONFIG_COMPAT 959 .compat_setsockopt = compat_ip_setsockopt, 960 .compat_getsockopt = compat_ip_getsockopt, 961 #endif 962 }; 963 964 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 965 966 switch (family) { 967 case PF_INET: 968 return sctp_pf_inet_specific; 969 case PF_INET6: 970 return sctp_pf_inet6_specific; 971 default: 972 return NULL; 973 } 974 } 975 976 /* Register the PF specific function table. */ 977 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 978 { 979 switch (family) { 980 case PF_INET: 981 if (sctp_pf_inet_specific) 982 return 0; 983 sctp_pf_inet_specific = pf; 984 break; 985 case PF_INET6: 986 if (sctp_pf_inet6_specific) 987 return 0; 988 sctp_pf_inet6_specific = pf; 989 break; 990 default: 991 return 0; 992 } 993 return 1; 994 } 995 996 static inline int init_sctp_mibs(void) 997 { 998 return snmp_mib_init((void __percpu **)sctp_statistics, 999 sizeof(struct sctp_mib)); 1000 } 1001 1002 static inline void cleanup_sctp_mibs(void) 1003 { 1004 snmp_mib_free((void __percpu **)sctp_statistics); 1005 } 1006 1007 static void sctp_v4_pf_init(void) 1008 { 1009 /* Initialize the SCTP specific PF functions. */ 1010 sctp_register_pf(&sctp_pf_inet, PF_INET); 1011 sctp_register_af(&sctp_af_inet); 1012 } 1013 1014 static void sctp_v4_pf_exit(void) 1015 { 1016 list_del(&sctp_af_inet.list); 1017 } 1018 1019 static int sctp_v4_protosw_init(void) 1020 { 1021 int rc; 1022 1023 rc = proto_register(&sctp_prot, 1); 1024 if (rc) 1025 return rc; 1026 1027 /* Register SCTP(UDP and TCP style) with socket layer. */ 1028 inet_register_protosw(&sctp_seqpacket_protosw); 1029 inet_register_protosw(&sctp_stream_protosw); 1030 1031 return 0; 1032 } 1033 1034 static void sctp_v4_protosw_exit(void) 1035 { 1036 inet_unregister_protosw(&sctp_stream_protosw); 1037 inet_unregister_protosw(&sctp_seqpacket_protosw); 1038 proto_unregister(&sctp_prot); 1039 } 1040 1041 static int sctp_v4_add_protocol(void) 1042 { 1043 /* Register notifier for inet address additions/deletions. */ 1044 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1045 1046 /* Register SCTP with inet layer. */ 1047 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1048 return -EAGAIN; 1049 1050 return 0; 1051 } 1052 1053 static void sctp_v4_del_protocol(void) 1054 { 1055 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1056 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1057 } 1058 1059 /* Initialize the universe into something sensible. */ 1060 SCTP_STATIC __init int sctp_init(void) 1061 { 1062 int i; 1063 int status = -EINVAL; 1064 unsigned long goal; 1065 unsigned long limit; 1066 unsigned long nr_pages; 1067 int max_share; 1068 int order; 1069 1070 /* SCTP_DEBUG sanity check. */ 1071 if (!sctp_sanity_check()) 1072 goto out; 1073 1074 /* Allocate bind_bucket and chunk caches. */ 1075 status = -ENOBUFS; 1076 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1077 sizeof(struct sctp_bind_bucket), 1078 0, SLAB_HWCACHE_ALIGN, 1079 NULL); 1080 if (!sctp_bucket_cachep) 1081 goto out; 1082 1083 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1084 sizeof(struct sctp_chunk), 1085 0, SLAB_HWCACHE_ALIGN, 1086 NULL); 1087 if (!sctp_chunk_cachep) 1088 goto err_chunk_cachep; 1089 1090 /* Allocate and initialise sctp mibs. */ 1091 status = init_sctp_mibs(); 1092 if (status) 1093 goto err_init_mibs; 1094 1095 /* Initialize proc fs directory. */ 1096 status = sctp_proc_init(); 1097 if (status) 1098 goto err_init_proc; 1099 1100 /* Initialize object count debugging. */ 1101 sctp_dbg_objcnt_init(); 1102 1103 /* 1104 * 14. Suggested SCTP Protocol Parameter Values 1105 */ 1106 /* The following protocol parameters are RECOMMENDED: */ 1107 /* RTO.Initial - 3 seconds */ 1108 sctp_rto_initial = SCTP_RTO_INITIAL; 1109 /* RTO.Min - 1 second */ 1110 sctp_rto_min = SCTP_RTO_MIN; 1111 /* RTO.Max - 60 seconds */ 1112 sctp_rto_max = SCTP_RTO_MAX; 1113 /* RTO.Alpha - 1/8 */ 1114 sctp_rto_alpha = SCTP_RTO_ALPHA; 1115 /* RTO.Beta - 1/4 */ 1116 sctp_rto_beta = SCTP_RTO_BETA; 1117 1118 /* Valid.Cookie.Life - 60 seconds */ 1119 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1120 1121 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1122 sctp_cookie_preserve_enable = 1; 1123 1124 /* Max.Burst - 4 */ 1125 sctp_max_burst = SCTP_DEFAULT_MAX_BURST; 1126 1127 /* Association.Max.Retrans - 10 attempts 1128 * Path.Max.Retrans - 5 attempts (per destination address) 1129 * Max.Init.Retransmits - 8 attempts 1130 */ 1131 sctp_max_retrans_association = 10; 1132 sctp_max_retrans_path = 5; 1133 sctp_max_retrans_init = 8; 1134 1135 /* Sendbuffer growth - do per-socket accounting */ 1136 sctp_sndbuf_policy = 0; 1137 1138 /* Rcvbuffer growth - do per-socket accounting */ 1139 sctp_rcvbuf_policy = 0; 1140 1141 /* HB.interval - 30 seconds */ 1142 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1143 1144 /* delayed SACK timeout */ 1145 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1146 1147 /* Implementation specific variables. */ 1148 1149 /* Initialize default stream count setup information. */ 1150 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1151 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1152 1153 /* Initialize handle used for association ids. */ 1154 idr_init(&sctp_assocs_id); 1155 1156 /* Set the pressure threshold to be a fraction of global memory that 1157 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of 1158 * memory, with a floor of 128 pages. 1159 * Note this initalizes the data in sctpv6_prot too 1160 * Unabashedly stolen from tcp_init 1161 */ 1162 nr_pages = totalram_pages - totalhigh_pages; 1163 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); 1164 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); 1165 limit = max(limit, 128UL); 1166 sysctl_sctp_mem[0] = limit / 4 * 3; 1167 sysctl_sctp_mem[1] = limit; 1168 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1169 1170 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1171 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1172 max_share = min(4UL*1024*1024, limit); 1173 1174 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1175 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); 1176 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1177 1178 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1179 sysctl_sctp_wmem[1] = 16*1024; 1180 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1181 1182 /* Size and allocate the association hash table. 1183 * The methodology is similar to that of the tcp hash tables. 1184 */ 1185 if (totalram_pages >= (128 * 1024)) 1186 goal = totalram_pages >> (22 - PAGE_SHIFT); 1187 else 1188 goal = totalram_pages >> (24 - PAGE_SHIFT); 1189 1190 for (order = 0; (1UL << order) < goal; order++) 1191 ; 1192 1193 do { 1194 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1195 sizeof(struct sctp_hashbucket); 1196 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1197 continue; 1198 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1199 __get_free_pages(GFP_ATOMIC, order); 1200 } while (!sctp_assoc_hashtable && --order > 0); 1201 if (!sctp_assoc_hashtable) { 1202 printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); 1203 status = -ENOMEM; 1204 goto err_ahash_alloc; 1205 } 1206 for (i = 0; i < sctp_assoc_hashsize; i++) { 1207 rwlock_init(&sctp_assoc_hashtable[i].lock); 1208 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1209 } 1210 1211 /* Allocate and initialize the endpoint hash table. */ 1212 sctp_ep_hashsize = 64; 1213 sctp_ep_hashtable = (struct sctp_hashbucket *) 1214 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1215 if (!sctp_ep_hashtable) { 1216 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); 1217 status = -ENOMEM; 1218 goto err_ehash_alloc; 1219 } 1220 for (i = 0; i < sctp_ep_hashsize; i++) { 1221 rwlock_init(&sctp_ep_hashtable[i].lock); 1222 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1223 } 1224 1225 /* Allocate and initialize the SCTP port hash table. */ 1226 do { 1227 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1228 sizeof(struct sctp_bind_hashbucket); 1229 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1230 continue; 1231 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1232 __get_free_pages(GFP_ATOMIC, order); 1233 } while (!sctp_port_hashtable && --order > 0); 1234 if (!sctp_port_hashtable) { 1235 printk(KERN_ERR "SCTP: Failed bind hash alloc."); 1236 status = -ENOMEM; 1237 goto err_bhash_alloc; 1238 } 1239 for (i = 0; i < sctp_port_hashsize; i++) { 1240 spin_lock_init(&sctp_port_hashtable[i].lock); 1241 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1242 } 1243 1244 printk(KERN_INFO "SCTP: Hash tables configured " 1245 "(established %d bind %d)\n", 1246 sctp_assoc_hashsize, sctp_port_hashsize); 1247 1248 /* Disable ADDIP by default. */ 1249 sctp_addip_enable = 0; 1250 sctp_addip_noauth = 0; 1251 1252 /* Enable PR-SCTP by default. */ 1253 sctp_prsctp_enable = 1; 1254 1255 /* Disable AUTH by default. */ 1256 sctp_auth_enable = 0; 1257 1258 /* Set SCOPE policy to enabled */ 1259 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE; 1260 1261 /* Set the default rwnd update threshold */ 1262 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; 1263 1264 sctp_sysctl_register(); 1265 1266 INIT_LIST_HEAD(&sctp_address_families); 1267 sctp_v4_pf_init(); 1268 sctp_v6_pf_init(); 1269 1270 /* Initialize the local address list. */ 1271 INIT_LIST_HEAD(&sctp_local_addr_list); 1272 spin_lock_init(&sctp_local_addr_lock); 1273 sctp_get_local_addr_list(); 1274 1275 status = sctp_v4_protosw_init(); 1276 1277 if (status) 1278 goto err_protosw_init; 1279 1280 status = sctp_v6_protosw_init(); 1281 if (status) 1282 goto err_v6_protosw_init; 1283 1284 /* Initialize the control inode/socket for handling OOTB packets. */ 1285 if ((status = sctp_ctl_sock_init())) { 1286 printk (KERN_ERR 1287 "SCTP: Failed to initialize the SCTP control sock.\n"); 1288 goto err_ctl_sock_init; 1289 } 1290 1291 status = sctp_v4_add_protocol(); 1292 if (status) 1293 goto err_add_protocol; 1294 1295 /* Register SCTP with inet6 layer. */ 1296 status = sctp_v6_add_protocol(); 1297 if (status) 1298 goto err_v6_add_protocol; 1299 1300 status = 0; 1301 out: 1302 return status; 1303 err_v6_add_protocol: 1304 sctp_v4_del_protocol(); 1305 err_add_protocol: 1306 inet_ctl_sock_destroy(sctp_ctl_sock); 1307 err_ctl_sock_init: 1308 sctp_v6_protosw_exit(); 1309 err_v6_protosw_init: 1310 sctp_v4_protosw_exit(); 1311 err_protosw_init: 1312 sctp_free_local_addr_list(); 1313 sctp_v4_pf_exit(); 1314 sctp_v6_pf_exit(); 1315 sctp_sysctl_unregister(); 1316 free_pages((unsigned long)sctp_port_hashtable, 1317 get_order(sctp_port_hashsize * 1318 sizeof(struct sctp_bind_hashbucket))); 1319 err_bhash_alloc: 1320 kfree(sctp_ep_hashtable); 1321 err_ehash_alloc: 1322 free_pages((unsigned long)sctp_assoc_hashtable, 1323 get_order(sctp_assoc_hashsize * 1324 sizeof(struct sctp_hashbucket))); 1325 err_ahash_alloc: 1326 sctp_dbg_objcnt_exit(); 1327 sctp_proc_exit(); 1328 err_init_proc: 1329 cleanup_sctp_mibs(); 1330 err_init_mibs: 1331 kmem_cache_destroy(sctp_chunk_cachep); 1332 err_chunk_cachep: 1333 kmem_cache_destroy(sctp_bucket_cachep); 1334 goto out; 1335 } 1336 1337 /* Exit handler for the SCTP protocol. */ 1338 SCTP_STATIC __exit void sctp_exit(void) 1339 { 1340 /* BUG. This should probably do something useful like clean 1341 * up all the remaining associations and all that memory. 1342 */ 1343 1344 /* Unregister with inet6/inet layers. */ 1345 sctp_v6_del_protocol(); 1346 sctp_v4_del_protocol(); 1347 1348 /* Free the control endpoint. */ 1349 inet_ctl_sock_destroy(sctp_ctl_sock); 1350 1351 /* Free protosw registrations */ 1352 sctp_v6_protosw_exit(); 1353 sctp_v4_protosw_exit(); 1354 1355 /* Free the local address list. */ 1356 sctp_free_local_addr_list(); 1357 1358 /* Unregister with socket layer. */ 1359 sctp_v6_pf_exit(); 1360 sctp_v4_pf_exit(); 1361 1362 sctp_sysctl_unregister(); 1363 1364 free_pages((unsigned long)sctp_assoc_hashtable, 1365 get_order(sctp_assoc_hashsize * 1366 sizeof(struct sctp_hashbucket))); 1367 kfree(sctp_ep_hashtable); 1368 free_pages((unsigned long)sctp_port_hashtable, 1369 get_order(sctp_port_hashsize * 1370 sizeof(struct sctp_bind_hashbucket))); 1371 1372 sctp_dbg_objcnt_exit(); 1373 sctp_proc_exit(); 1374 cleanup_sctp_mibs(); 1375 1376 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1377 1378 kmem_cache_destroy(sctp_chunk_cachep); 1379 kmem_cache_destroy(sctp_bucket_cachep); 1380 } 1381 1382 module_init(sctp_init); 1383 module_exit(sctp_exit); 1384 1385 /* 1386 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1387 */ 1388 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1389 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1390 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1391 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1392 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1393 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1394 MODULE_LICENSE("GPL"); 1395