1 /* SCTP kernel reference 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 reference Implementation 10 * 11 * Initialization/cleanup for SCTP protocol support. 12 * 13 * The SCTP reference 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 * The SCTP reference 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 <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 /* Global data structures. */ 64 struct sctp_globals sctp_globals __read_mostly; 65 struct proc_dir_entry *proc_net_sctp; 66 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; 67 68 struct idr sctp_assocs_id; 69 DEFINE_SPINLOCK(sctp_assocs_id_lock); 70 71 /* This is the global socket data structure used for responding to 72 * the Out-of-the-blue (OOTB) packets. A control sock will be created 73 * for this socket at the initialization time. 74 */ 75 static struct socket *sctp_ctl_socket; 76 77 static struct sctp_pf *sctp_pf_inet6_specific; 78 static struct sctp_pf *sctp_pf_inet_specific; 79 static struct sctp_af *sctp_af_v4_specific; 80 static struct sctp_af *sctp_af_v6_specific; 81 82 struct kmem_cache *sctp_chunk_cachep __read_mostly; 83 struct kmem_cache *sctp_bucket_cachep __read_mostly; 84 85 /* Return the address of the control sock. */ 86 struct sock *sctp_get_ctl_sock(void) 87 { 88 return sctp_ctl_socket->sk; 89 } 90 91 /* Set up the proc fs entry for the SCTP protocol. */ 92 static __init int sctp_proc_init(void) 93 { 94 if (!proc_net_sctp) { 95 struct proc_dir_entry *ent; 96 ent = proc_mkdir("net/sctp", NULL); 97 if (ent) { 98 ent->owner = THIS_MODULE; 99 proc_net_sctp = ent; 100 } else 101 goto out_nomem; 102 } 103 104 if (sctp_snmp_proc_init()) 105 goto out_nomem; 106 if (sctp_eps_proc_init()) 107 goto out_nomem; 108 if (sctp_assocs_proc_init()) 109 goto out_nomem; 110 111 return 0; 112 113 out_nomem: 114 return -ENOMEM; 115 } 116 117 /* Clean up the proc fs entry for the SCTP protocol. 118 * Note: Do not make this __exit as it is used in the init error 119 * path. 120 */ 121 static void sctp_proc_exit(void) 122 { 123 sctp_snmp_proc_exit(); 124 sctp_eps_proc_exit(); 125 sctp_assocs_proc_exit(); 126 127 if (proc_net_sctp) { 128 proc_net_sctp = NULL; 129 remove_proc_entry("net/sctp", NULL); 130 } 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 = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 152 if (addr) { 153 addr->a.v4.sin_family = AF_INET; 154 addr->a.v4.sin_port = 0; 155 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 156 list_add_tail(&addr->list, addrlist); 157 } 158 } 159 160 rcu_read_unlock(); 161 } 162 163 /* Extract our IP addresses from the system and stash them in the 164 * protocol structure. 165 */ 166 static void sctp_get_local_addr_list(void) 167 { 168 struct net_device *dev; 169 struct list_head *pos; 170 struct sctp_af *af; 171 172 read_lock(&dev_base_lock); 173 for (dev = dev_base; dev; dev = dev->next) { 174 __list_for_each(pos, &sctp_address_families) { 175 af = list_entry(pos, struct sctp_af, list); 176 af->copy_addrlist(&sctp_local_addr_list, dev); 177 } 178 } 179 read_unlock(&dev_base_lock); 180 } 181 182 /* Free the existing local addresses. */ 183 static void sctp_free_local_addr_list(void) 184 { 185 struct sctp_sockaddr_entry *addr; 186 struct list_head *pos, *temp; 187 188 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 189 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 190 list_del(pos); 191 kfree(addr); 192 } 193 } 194 195 /* Copy the local addresses which are valid for 'scope' into 'bp'. */ 196 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, 197 gfp_t gfp, int copy_flags) 198 { 199 struct sctp_sockaddr_entry *addr; 200 int error = 0; 201 struct list_head *pos, *temp; 202 203 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 204 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 205 if (sctp_in_scope(&addr->a, scope)) { 206 /* Now that the address is in scope, check to see if 207 * the address type is really supported by the local 208 * sock as well as the remote peer. 209 */ 210 if ((((AF_INET == addr->a.sa.sa_family) && 211 (copy_flags & SCTP_ADDR4_PEERSUPP))) || 212 (((AF_INET6 == addr->a.sa.sa_family) && 213 (copy_flags & SCTP_ADDR6_ALLOWED) && 214 (copy_flags & SCTP_ADDR6_PEERSUPP)))) { 215 error = sctp_add_bind_addr(bp, &addr->a, 1, 216 GFP_ATOMIC); 217 if (error) 218 goto end_copy; 219 } 220 } 221 } 222 223 end_copy: 224 return error; 225 } 226 227 /* Initialize a sctp_addr from in incoming skb. */ 228 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 229 int is_saddr) 230 { 231 void *from; 232 __be16 *port; 233 struct sctphdr *sh; 234 235 port = &addr->v4.sin_port; 236 addr->v4.sin_family = AF_INET; 237 238 sh = (struct sctphdr *) skb->h.raw; 239 if (is_saddr) { 240 *port = sh->source; 241 from = &skb->nh.iph->saddr; 242 } else { 243 *port = sh->dest; 244 from = &skb->nh.iph->daddr; 245 } 246 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); 247 } 248 249 /* Initialize an sctp_addr from a socket. */ 250 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 251 { 252 addr->v4.sin_family = AF_INET; 253 addr->v4.sin_port = 0; 254 addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr; 255 } 256 257 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 258 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 259 { 260 inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr; 261 } 262 263 /* Initialize sk->sk_daddr from sctp_addr. */ 264 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 265 { 266 inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr; 267 } 268 269 /* Initialize a sctp_addr from an address parameter. */ 270 static void sctp_v4_from_addr_param(union sctp_addr *addr, 271 union sctp_addr_param *param, 272 __be16 port, int iif) 273 { 274 addr->v4.sin_family = AF_INET; 275 addr->v4.sin_port = port; 276 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 277 } 278 279 /* Initialize an address parameter from a sctp_addr and return the length 280 * of the address parameter. 281 */ 282 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 283 union sctp_addr_param *param) 284 { 285 int length = sizeof(sctp_ipv4addr_param_t); 286 287 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 288 param->v4.param_hdr.length = htons(length); 289 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 290 291 return length; 292 } 293 294 /* Initialize a sctp_addr from a dst_entry. */ 295 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, 296 __be16 port) 297 { 298 struct rtable *rt = (struct rtable *)dst; 299 saddr->v4.sin_family = AF_INET; 300 saddr->v4.sin_port = port; 301 saddr->v4.sin_addr.s_addr = rt->rt_src; 302 } 303 304 /* Compare two addresses exactly. */ 305 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 306 const union sctp_addr *addr2) 307 { 308 if (addr1->sa.sa_family != addr2->sa.sa_family) 309 return 0; 310 if (addr1->v4.sin_port != addr2->v4.sin_port) 311 return 0; 312 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 313 return 0; 314 315 return 1; 316 } 317 318 /* Initialize addr struct to INADDR_ANY. */ 319 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 320 { 321 addr->v4.sin_family = AF_INET; 322 addr->v4.sin_addr.s_addr = INADDR_ANY; 323 addr->v4.sin_port = port; 324 } 325 326 /* Is this a wildcard address? */ 327 static int sctp_v4_is_any(const union sctp_addr *addr) 328 { 329 return INADDR_ANY == addr->v4.sin_addr.s_addr; 330 } 331 332 /* This function checks if the address is a valid address to be used for 333 * SCTP binding. 334 * 335 * Output: 336 * Return 0 - If the address is a non-unicast or an illegal address. 337 * Return 1 - If the address is a unicast. 338 */ 339 static int sctp_v4_addr_valid(union sctp_addr *addr, 340 struct sctp_sock *sp, 341 const struct sk_buff *skb) 342 { 343 /* Is this a non-unicast address or a unusable SCTP address? */ 344 if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) 345 return 0; 346 347 /* Is this a broadcast address? */ 348 if (skb && ((struct rtable *)skb->dst)->rt_flags & RTCF_BROADCAST) 349 return 0; 350 351 return 1; 352 } 353 354 /* Should this be available for binding? */ 355 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 356 { 357 int ret = inet_addr_type(addr->v4.sin_addr.s_addr); 358 359 360 if (addr->v4.sin_addr.s_addr != INADDR_ANY && 361 ret != RTN_LOCAL && 362 !sp->inet.freebind && 363 !sysctl_ip_nonlocal_bind) 364 return 0; 365 366 return 1; 367 } 368 369 /* Checking the loopback, private and other address scopes as defined in 370 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 371 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 372 * 373 * Level 0 - unusable SCTP addresses 374 * Level 1 - loopback address 375 * Level 2 - link-local addresses 376 * Level 3 - private addresses. 377 * Level 4 - global addresses 378 * For INIT and INIT-ACK address list, let L be the level of 379 * of requested destination address, sender and receiver 380 * SHOULD include all of its addresses with level greater 381 * than or equal to L. 382 */ 383 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 384 { 385 sctp_scope_t retval; 386 387 /* Should IPv4 scoping be a sysctl configurable option 388 * so users can turn it off (default on) for certain 389 * unconventional networking environments? 390 */ 391 392 /* Check for unusable SCTP addresses. */ 393 if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) { 394 retval = SCTP_SCOPE_UNUSABLE; 395 } else if (LOOPBACK(addr->v4.sin_addr.s_addr)) { 396 retval = SCTP_SCOPE_LOOPBACK; 397 } else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) { 398 retval = SCTP_SCOPE_LINK; 399 } else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) { 400 retval = SCTP_SCOPE_PRIVATE; 401 } else { 402 retval = SCTP_SCOPE_GLOBAL; 403 } 404 405 return retval; 406 } 407 408 /* Returns a valid dst cache entry for the given source and destination ip 409 * addresses. If an association is passed, trys to get a dst entry with a 410 * source address that matches an address in the bind address list. 411 */ 412 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, 413 union sctp_addr *daddr, 414 union sctp_addr *saddr) 415 { 416 struct rtable *rt; 417 struct flowi fl; 418 struct sctp_bind_addr *bp; 419 rwlock_t *addr_lock; 420 struct sctp_sockaddr_entry *laddr; 421 struct list_head *pos; 422 struct dst_entry *dst = NULL; 423 union sctp_addr dst_saddr; 424 425 memset(&fl, 0x0, sizeof(struct flowi)); 426 fl.fl4_dst = daddr->v4.sin_addr.s_addr; 427 fl.proto = IPPROTO_SCTP; 428 if (asoc) { 429 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); 430 fl.oif = asoc->base.sk->sk_bound_dev_if; 431 } 432 if (saddr) 433 fl.fl4_src = saddr->v4.sin_addr.s_addr; 434 435 SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ", 436 __FUNCTION__, NIPQUAD(fl.fl4_dst), 437 NIPQUAD(fl.fl4_src)); 438 439 if (!ip_route_output_key(&rt, &fl)) { 440 dst = &rt->u.dst; 441 } 442 443 /* If there is no association or if a source address is passed, no 444 * more validation is required. 445 */ 446 if (!asoc || saddr) 447 goto out; 448 449 bp = &asoc->base.bind_addr; 450 addr_lock = &asoc->base.addr_lock; 451 452 if (dst) { 453 /* Walk through the bind address list and look for a bind 454 * address that matches the source address of the returned dst. 455 */ 456 sctp_read_lock(addr_lock); 457 list_for_each(pos, &bp->address_list) { 458 laddr = list_entry(pos, struct sctp_sockaddr_entry, 459 list); 460 if (!laddr->use_as_src) 461 continue; 462 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); 463 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 464 goto out_unlock; 465 } 466 sctp_read_unlock(addr_lock); 467 468 /* None of the bound addresses match the source address of the 469 * dst. So release it. 470 */ 471 dst_release(dst); 472 dst = NULL; 473 } 474 475 /* Walk through the bind address list and try to get a dst that 476 * matches a bind address as the source address. 477 */ 478 sctp_read_lock(addr_lock); 479 list_for_each(pos, &bp->address_list) { 480 laddr = list_entry(pos, struct sctp_sockaddr_entry, list); 481 482 if ((laddr->use_as_src) && 483 (AF_INET == laddr->a.sa.sa_family)) { 484 fl.fl4_src = laddr->a.v4.sin_addr.s_addr; 485 if (!ip_route_output_key(&rt, &fl)) { 486 dst = &rt->u.dst; 487 goto out_unlock; 488 } 489 } 490 } 491 492 out_unlock: 493 sctp_read_unlock(addr_lock); 494 out: 495 if (dst) 496 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n", 497 NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src)); 498 else 499 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 500 501 return dst; 502 } 503 504 /* For v4, the source address is cached in the route entry(dst). So no need 505 * to cache it separately and hence this is an empty routine. 506 */ 507 static void sctp_v4_get_saddr(struct sctp_association *asoc, 508 struct dst_entry *dst, 509 union sctp_addr *daddr, 510 union sctp_addr *saddr) 511 { 512 struct rtable *rt = (struct rtable *)dst; 513 514 if (!asoc) 515 return; 516 517 if (rt) { 518 saddr->v4.sin_family = AF_INET; 519 saddr->v4.sin_port = htons(asoc->base.bind_addr.port); 520 saddr->v4.sin_addr.s_addr = rt->rt_src; 521 } 522 } 523 524 /* What interface did this skb arrive on? */ 525 static int sctp_v4_skb_iif(const struct sk_buff *skb) 526 { 527 return ((struct rtable *)skb->dst)->rt_iif; 528 } 529 530 /* Was this packet marked by Explicit Congestion Notification? */ 531 static int sctp_v4_is_ce(const struct sk_buff *skb) 532 { 533 return INET_ECN_is_ce(skb->nh.iph->tos); 534 } 535 536 /* Create and initialize a new sk for the socket returned by accept(). */ 537 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 538 struct sctp_association *asoc) 539 { 540 struct inet_sock *inet = inet_sk(sk); 541 struct inet_sock *newinet; 542 struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1); 543 544 if (!newsk) 545 goto out; 546 547 sock_init_data(NULL, newsk); 548 549 newsk->sk_type = SOCK_STREAM; 550 551 newsk->sk_no_check = sk->sk_no_check; 552 newsk->sk_reuse = sk->sk_reuse; 553 newsk->sk_shutdown = sk->sk_shutdown; 554 555 newsk->sk_destruct = inet_sock_destruct; 556 newsk->sk_family = PF_INET; 557 newsk->sk_protocol = IPPROTO_SCTP; 558 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 559 sock_reset_flag(newsk, SOCK_ZAPPED); 560 561 newinet = inet_sk(newsk); 562 563 /* Initialize sk's sport, dport, rcv_saddr and daddr for 564 * getsockname() and getpeername() 565 */ 566 newinet->sport = inet->sport; 567 newinet->saddr = inet->saddr; 568 newinet->rcv_saddr = inet->rcv_saddr; 569 newinet->dport = htons(asoc->peer.port); 570 newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 571 newinet->pmtudisc = inet->pmtudisc; 572 newinet->id = asoc->next_tsn ^ jiffies; 573 574 newinet->uc_ttl = -1; 575 newinet->mc_loop = 1; 576 newinet->mc_ttl = 1; 577 newinet->mc_index = 0; 578 newinet->mc_list = NULL; 579 580 sk_refcnt_debug_inc(newsk); 581 582 if (newsk->sk_prot->init(newsk)) { 583 sk_common_release(newsk); 584 newsk = NULL; 585 } 586 587 out: 588 return newsk; 589 } 590 591 /* Map address, empty for v4 family */ 592 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 593 { 594 /* Empty */ 595 } 596 597 /* Dump the v4 addr to the seq file. */ 598 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 599 { 600 seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr)); 601 } 602 603 /* Event handler for inet address addition/deletion events. */ 604 int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 605 void *ptr) 606 { 607 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 608 struct sctp_sockaddr_entry *addr; 609 struct list_head *pos, *temp; 610 611 switch (ev) { 612 case NETDEV_UP: 613 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 614 if (addr) { 615 addr->a.v4.sin_family = AF_INET; 616 addr->a.v4.sin_port = 0; 617 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 618 list_add_tail(&addr->list, &sctp_local_addr_list); 619 } 620 break; 621 case NETDEV_DOWN: 622 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 623 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 624 if (addr->a.v4.sin_addr.s_addr == ifa->ifa_local) { 625 list_del(pos); 626 kfree(addr); 627 break; 628 } 629 } 630 631 break; 632 } 633 634 return NOTIFY_DONE; 635 } 636 637 /* 638 * Initialize the control inode/socket with a control endpoint data 639 * structure. This endpoint is reserved exclusively for the OOTB processing. 640 */ 641 static int sctp_ctl_sock_init(void) 642 { 643 int err; 644 sa_family_t family; 645 646 if (sctp_get_pf_specific(PF_INET6)) 647 family = PF_INET6; 648 else 649 family = PF_INET; 650 651 err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP, 652 &sctp_ctl_socket); 653 if (err < 0) { 654 printk(KERN_ERR 655 "SCTP: Failed to create the SCTP control socket.\n"); 656 return err; 657 } 658 sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC; 659 inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1; 660 661 return 0; 662 } 663 664 /* Register address family specific functions. */ 665 int sctp_register_af(struct sctp_af *af) 666 { 667 switch (af->sa_family) { 668 case AF_INET: 669 if (sctp_af_v4_specific) 670 return 0; 671 sctp_af_v4_specific = af; 672 break; 673 case AF_INET6: 674 if (sctp_af_v6_specific) 675 return 0; 676 sctp_af_v6_specific = af; 677 break; 678 default: 679 return 0; 680 } 681 682 INIT_LIST_HEAD(&af->list); 683 list_add_tail(&af->list, &sctp_address_families); 684 return 1; 685 } 686 687 /* Get the table of functions for manipulating a particular address 688 * family. 689 */ 690 struct sctp_af *sctp_get_af_specific(sa_family_t family) 691 { 692 switch (family) { 693 case AF_INET: 694 return sctp_af_v4_specific; 695 case AF_INET6: 696 return sctp_af_v6_specific; 697 default: 698 return NULL; 699 } 700 } 701 702 /* Common code to initialize a AF_INET msg_name. */ 703 static void sctp_inet_msgname(char *msgname, int *addr_len) 704 { 705 struct sockaddr_in *sin; 706 707 sin = (struct sockaddr_in *)msgname; 708 *addr_len = sizeof(struct sockaddr_in); 709 sin->sin_family = AF_INET; 710 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 711 } 712 713 /* Copy the primary address of the peer primary address as the msg_name. */ 714 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 715 int *addr_len) 716 { 717 struct sockaddr_in *sin, *sinfrom; 718 719 if (msgname) { 720 struct sctp_association *asoc; 721 722 asoc = event->asoc; 723 sctp_inet_msgname(msgname, addr_len); 724 sin = (struct sockaddr_in *)msgname; 725 sinfrom = &asoc->peer.primary_addr.v4; 726 sin->sin_port = htons(asoc->peer.port); 727 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 728 } 729 } 730 731 /* Initialize and copy out a msgname from an inbound skb. */ 732 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 733 { 734 struct sctphdr *sh; 735 struct sockaddr_in *sin; 736 737 if (msgname) { 738 sctp_inet_msgname(msgname, len); 739 sin = (struct sockaddr_in *)msgname; 740 sh = (struct sctphdr *)skb->h.raw; 741 sin->sin_port = sh->source; 742 sin->sin_addr.s_addr = skb->nh.iph->saddr; 743 } 744 } 745 746 /* Do we support this AF? */ 747 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 748 { 749 /* PF_INET only supports AF_INET addresses. */ 750 return (AF_INET == family); 751 } 752 753 /* Address matching with wildcards allowed. */ 754 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 755 const union sctp_addr *addr2, 756 struct sctp_sock *opt) 757 { 758 /* PF_INET only supports AF_INET addresses. */ 759 if (addr1->sa.sa_family != addr2->sa.sa_family) 760 return 0; 761 if (INADDR_ANY == addr1->v4.sin_addr.s_addr || 762 INADDR_ANY == addr2->v4.sin_addr.s_addr) 763 return 1; 764 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 765 return 1; 766 767 return 0; 768 } 769 770 /* Verify that provided sockaddr looks bindable. Common verification has 771 * already been taken care of. 772 */ 773 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 774 { 775 return sctp_v4_available(addr, opt); 776 } 777 778 /* Verify that sockaddr looks sendable. Common verification has already 779 * been taken care of. 780 */ 781 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 782 { 783 return 1; 784 } 785 786 /* Fill in Supported Address Type information for INIT and INIT-ACK 787 * chunks. Returns number of addresses supported. 788 */ 789 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 790 __be16 *types) 791 { 792 types[0] = SCTP_PARAM_IPV4_ADDRESS; 793 return 1; 794 } 795 796 /* Wrapper routine that calls the ip transmit routine. */ 797 static inline int sctp_v4_xmit(struct sk_buff *skb, 798 struct sctp_transport *transport, int ipfragok) 799 { 800 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " 801 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n", 802 __FUNCTION__, skb, skb->len, 803 NIPQUAD(((struct rtable *)skb->dst)->rt_src), 804 NIPQUAD(((struct rtable *)skb->dst)->rt_dst)); 805 806 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 807 return ip_queue_xmit(skb, skb->sk, ipfragok); 808 } 809 810 static struct sctp_af sctp_ipv4_specific; 811 812 static struct sctp_pf sctp_pf_inet = { 813 .event_msgname = sctp_inet_event_msgname, 814 .skb_msgname = sctp_inet_skb_msgname, 815 .af_supported = sctp_inet_af_supported, 816 .cmp_addr = sctp_inet_cmp_addr, 817 .bind_verify = sctp_inet_bind_verify, 818 .send_verify = sctp_inet_send_verify, 819 .supported_addrs = sctp_inet_supported_addrs, 820 .create_accept_sk = sctp_v4_create_accept_sk, 821 .addr_v4map = sctp_v4_addr_v4map, 822 .af = &sctp_ipv4_specific, 823 }; 824 825 /* Notifier for inetaddr addition/deletion events. */ 826 static struct notifier_block sctp_inetaddr_notifier = { 827 .notifier_call = sctp_inetaddr_event, 828 }; 829 830 /* Socket operations. */ 831 static const struct proto_ops inet_seqpacket_ops = { 832 .family = PF_INET, 833 .owner = THIS_MODULE, 834 .release = inet_release, /* Needs to be wrapped... */ 835 .bind = inet_bind, 836 .connect = inet_dgram_connect, 837 .socketpair = sock_no_socketpair, 838 .accept = inet_accept, 839 .getname = inet_getname, /* Semantics are different. */ 840 .poll = sctp_poll, 841 .ioctl = inet_ioctl, 842 .listen = sctp_inet_listen, 843 .shutdown = inet_shutdown, /* Looks harmless. */ 844 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 845 .getsockopt = sock_common_getsockopt, 846 .sendmsg = inet_sendmsg, 847 .recvmsg = sock_common_recvmsg, 848 .mmap = sock_no_mmap, 849 .sendpage = sock_no_sendpage, 850 #ifdef CONFIG_COMPAT 851 .compat_setsockopt = compat_sock_common_setsockopt, 852 .compat_getsockopt = compat_sock_common_getsockopt, 853 #endif 854 }; 855 856 /* Registration with AF_INET family. */ 857 static struct inet_protosw sctp_seqpacket_protosw = { 858 .type = SOCK_SEQPACKET, 859 .protocol = IPPROTO_SCTP, 860 .prot = &sctp_prot, 861 .ops = &inet_seqpacket_ops, 862 .capability = -1, 863 .no_check = 0, 864 .flags = SCTP_PROTOSW_FLAG 865 }; 866 static struct inet_protosw sctp_stream_protosw = { 867 .type = SOCK_STREAM, 868 .protocol = IPPROTO_SCTP, 869 .prot = &sctp_prot, 870 .ops = &inet_seqpacket_ops, 871 .capability = -1, 872 .no_check = 0, 873 .flags = SCTP_PROTOSW_FLAG 874 }; 875 876 /* Register with IP layer. */ 877 static struct net_protocol sctp_protocol = { 878 .handler = sctp_rcv, 879 .err_handler = sctp_v4_err, 880 .no_policy = 1, 881 }; 882 883 /* IPv4 address related functions. */ 884 static struct sctp_af sctp_ipv4_specific = { 885 .sa_family = AF_INET, 886 .sctp_xmit = sctp_v4_xmit, 887 .setsockopt = ip_setsockopt, 888 .getsockopt = ip_getsockopt, 889 .get_dst = sctp_v4_get_dst, 890 .get_saddr = sctp_v4_get_saddr, 891 .copy_addrlist = sctp_v4_copy_addrlist, 892 .from_skb = sctp_v4_from_skb, 893 .from_sk = sctp_v4_from_sk, 894 .to_sk_saddr = sctp_v4_to_sk_saddr, 895 .to_sk_daddr = sctp_v4_to_sk_daddr, 896 .from_addr_param = sctp_v4_from_addr_param, 897 .to_addr_param = sctp_v4_to_addr_param, 898 .dst_saddr = sctp_v4_dst_saddr, 899 .cmp_addr = sctp_v4_cmp_addr, 900 .addr_valid = sctp_v4_addr_valid, 901 .inaddr_any = sctp_v4_inaddr_any, 902 .is_any = sctp_v4_is_any, 903 .available = sctp_v4_available, 904 .scope = sctp_v4_scope, 905 .skb_iif = sctp_v4_skb_iif, 906 .is_ce = sctp_v4_is_ce, 907 .seq_dump_addr = sctp_v4_seq_dump_addr, 908 .net_header_len = sizeof(struct iphdr), 909 .sockaddr_len = sizeof(struct sockaddr_in), 910 #ifdef CONFIG_COMPAT 911 .compat_setsockopt = compat_ip_setsockopt, 912 .compat_getsockopt = compat_ip_getsockopt, 913 #endif 914 }; 915 916 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 917 918 switch (family) { 919 case PF_INET: 920 return sctp_pf_inet_specific; 921 case PF_INET6: 922 return sctp_pf_inet6_specific; 923 default: 924 return NULL; 925 } 926 } 927 928 /* Register the PF specific function table. */ 929 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 930 { 931 switch (family) { 932 case PF_INET: 933 if (sctp_pf_inet_specific) 934 return 0; 935 sctp_pf_inet_specific = pf; 936 break; 937 case PF_INET6: 938 if (sctp_pf_inet6_specific) 939 return 0; 940 sctp_pf_inet6_specific = pf; 941 break; 942 default: 943 return 0; 944 } 945 return 1; 946 } 947 948 static int __init init_sctp_mibs(void) 949 { 950 sctp_statistics[0] = alloc_percpu(struct sctp_mib); 951 if (!sctp_statistics[0]) 952 return -ENOMEM; 953 sctp_statistics[1] = alloc_percpu(struct sctp_mib); 954 if (!sctp_statistics[1]) { 955 free_percpu(sctp_statistics[0]); 956 return -ENOMEM; 957 } 958 return 0; 959 960 } 961 962 static void cleanup_sctp_mibs(void) 963 { 964 free_percpu(sctp_statistics[0]); 965 free_percpu(sctp_statistics[1]); 966 } 967 968 /* Initialize the universe into something sensible. */ 969 SCTP_STATIC __init int sctp_init(void) 970 { 971 int i; 972 int status = -EINVAL; 973 unsigned long goal; 974 int order; 975 976 /* SCTP_DEBUG sanity check. */ 977 if (!sctp_sanity_check()) 978 goto out; 979 980 status = proto_register(&sctp_prot, 1); 981 if (status) 982 goto out; 983 984 /* Add SCTP to inet_protos hash table. */ 985 status = -EAGAIN; 986 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 987 goto err_add_protocol; 988 989 /* Add SCTP(TCP and UDP style) to inetsw linked list. */ 990 inet_register_protosw(&sctp_seqpacket_protosw); 991 inet_register_protosw(&sctp_stream_protosw); 992 993 /* Allocate a cache pools. */ 994 status = -ENOBUFS; 995 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 996 sizeof(struct sctp_bind_bucket), 997 0, SLAB_HWCACHE_ALIGN, 998 NULL, NULL); 999 1000 if (!sctp_bucket_cachep) 1001 goto err_bucket_cachep; 1002 1003 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1004 sizeof(struct sctp_chunk), 1005 0, SLAB_HWCACHE_ALIGN, 1006 NULL, NULL); 1007 if (!sctp_chunk_cachep) 1008 goto err_chunk_cachep; 1009 1010 /* Allocate and initialise sctp mibs. */ 1011 status = init_sctp_mibs(); 1012 if (status) 1013 goto err_init_mibs; 1014 1015 /* Initialize proc fs directory. */ 1016 status = sctp_proc_init(); 1017 if (status) 1018 goto err_init_proc; 1019 1020 /* Initialize object count debugging. */ 1021 sctp_dbg_objcnt_init(); 1022 1023 /* Initialize the SCTP specific PF functions. */ 1024 sctp_register_pf(&sctp_pf_inet, PF_INET); 1025 /* 1026 * 14. Suggested SCTP Protocol Parameter Values 1027 */ 1028 /* The following protocol parameters are RECOMMENDED: */ 1029 /* RTO.Initial - 3 seconds */ 1030 sctp_rto_initial = SCTP_RTO_INITIAL; 1031 /* RTO.Min - 1 second */ 1032 sctp_rto_min = SCTP_RTO_MIN; 1033 /* RTO.Max - 60 seconds */ 1034 sctp_rto_max = SCTP_RTO_MAX; 1035 /* RTO.Alpha - 1/8 */ 1036 sctp_rto_alpha = SCTP_RTO_ALPHA; 1037 /* RTO.Beta - 1/4 */ 1038 sctp_rto_beta = SCTP_RTO_BETA; 1039 1040 /* Valid.Cookie.Life - 60 seconds */ 1041 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1042 1043 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1044 sctp_cookie_preserve_enable = 1; 1045 1046 /* Max.Burst - 4 */ 1047 sctp_max_burst = SCTP_MAX_BURST; 1048 1049 /* Association.Max.Retrans - 10 attempts 1050 * Path.Max.Retrans - 5 attempts (per destination address) 1051 * Max.Init.Retransmits - 8 attempts 1052 */ 1053 sctp_max_retrans_association = 10; 1054 sctp_max_retrans_path = 5; 1055 sctp_max_retrans_init = 8; 1056 1057 /* Sendbuffer growth - do per-socket accounting */ 1058 sctp_sndbuf_policy = 0; 1059 1060 /* Rcvbuffer growth - do per-socket accounting */ 1061 sctp_rcvbuf_policy = 0; 1062 1063 /* HB.interval - 30 seconds */ 1064 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1065 1066 /* delayed SACK timeout */ 1067 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1068 1069 /* Implementation specific variables. */ 1070 1071 /* Initialize default stream count setup information. */ 1072 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1073 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1074 1075 /* Initialize handle used for association ids. */ 1076 idr_init(&sctp_assocs_id); 1077 1078 /* Size and allocate the association hash table. 1079 * The methodology is similar to that of the tcp hash tables. 1080 */ 1081 if (num_physpages >= (128 * 1024)) 1082 goal = num_physpages >> (22 - PAGE_SHIFT); 1083 else 1084 goal = num_physpages >> (24 - PAGE_SHIFT); 1085 1086 for (order = 0; (1UL << order) < goal; order++) 1087 ; 1088 1089 do { 1090 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1091 sizeof(struct sctp_hashbucket); 1092 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1093 continue; 1094 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1095 __get_free_pages(GFP_ATOMIC, order); 1096 } while (!sctp_assoc_hashtable && --order > 0); 1097 if (!sctp_assoc_hashtable) { 1098 printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); 1099 status = -ENOMEM; 1100 goto err_ahash_alloc; 1101 } 1102 for (i = 0; i < sctp_assoc_hashsize; i++) { 1103 rwlock_init(&sctp_assoc_hashtable[i].lock); 1104 sctp_assoc_hashtable[i].chain = NULL; 1105 } 1106 1107 /* Allocate and initialize the endpoint hash table. */ 1108 sctp_ep_hashsize = 64; 1109 sctp_ep_hashtable = (struct sctp_hashbucket *) 1110 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1111 if (!sctp_ep_hashtable) { 1112 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); 1113 status = -ENOMEM; 1114 goto err_ehash_alloc; 1115 } 1116 for (i = 0; i < sctp_ep_hashsize; i++) { 1117 rwlock_init(&sctp_ep_hashtable[i].lock); 1118 sctp_ep_hashtable[i].chain = NULL; 1119 } 1120 1121 /* Allocate and initialize the SCTP port hash table. */ 1122 do { 1123 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1124 sizeof(struct sctp_bind_hashbucket); 1125 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1126 continue; 1127 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1128 __get_free_pages(GFP_ATOMIC, order); 1129 } while (!sctp_port_hashtable && --order > 0); 1130 if (!sctp_port_hashtable) { 1131 printk(KERN_ERR "SCTP: Failed bind hash alloc."); 1132 status = -ENOMEM; 1133 goto err_bhash_alloc; 1134 } 1135 for (i = 0; i < sctp_port_hashsize; i++) { 1136 spin_lock_init(&sctp_port_hashtable[i].lock); 1137 sctp_port_hashtable[i].chain = NULL; 1138 } 1139 1140 spin_lock_init(&sctp_port_alloc_lock); 1141 sctp_port_rover = sysctl_local_port_range[0] - 1; 1142 1143 printk(KERN_INFO "SCTP: Hash tables configured " 1144 "(established %d bind %d)\n", 1145 sctp_assoc_hashsize, sctp_port_hashsize); 1146 1147 /* Disable ADDIP by default. */ 1148 sctp_addip_enable = 0; 1149 1150 /* Enable PR-SCTP by default. */ 1151 sctp_prsctp_enable = 1; 1152 1153 sctp_sysctl_register(); 1154 1155 INIT_LIST_HEAD(&sctp_address_families); 1156 sctp_register_af(&sctp_ipv4_specific); 1157 1158 status = sctp_v6_init(); 1159 if (status) 1160 goto err_v6_init; 1161 1162 /* Initialize the control inode/socket for handling OOTB packets. */ 1163 if ((status = sctp_ctl_sock_init())) { 1164 printk (KERN_ERR 1165 "SCTP: Failed to initialize the SCTP control sock.\n"); 1166 goto err_ctl_sock_init; 1167 } 1168 1169 /* Initialize the local address list. */ 1170 INIT_LIST_HEAD(&sctp_local_addr_list); 1171 1172 sctp_get_local_addr_list(); 1173 1174 /* Register notifier for inet address additions/deletions. */ 1175 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1176 1177 __unsafe(THIS_MODULE); 1178 status = 0; 1179 out: 1180 return status; 1181 err_ctl_sock_init: 1182 sctp_v6_exit(); 1183 err_v6_init: 1184 sctp_sysctl_unregister(); 1185 list_del(&sctp_ipv4_specific.list); 1186 free_pages((unsigned long)sctp_port_hashtable, 1187 get_order(sctp_port_hashsize * 1188 sizeof(struct sctp_bind_hashbucket))); 1189 err_bhash_alloc: 1190 kfree(sctp_ep_hashtable); 1191 err_ehash_alloc: 1192 free_pages((unsigned long)sctp_assoc_hashtable, 1193 get_order(sctp_assoc_hashsize * 1194 sizeof(struct sctp_hashbucket))); 1195 err_ahash_alloc: 1196 sctp_dbg_objcnt_exit(); 1197 err_init_proc: 1198 sctp_proc_exit(); 1199 cleanup_sctp_mibs(); 1200 err_init_mibs: 1201 kmem_cache_destroy(sctp_chunk_cachep); 1202 err_chunk_cachep: 1203 kmem_cache_destroy(sctp_bucket_cachep); 1204 err_bucket_cachep: 1205 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1206 inet_unregister_protosw(&sctp_seqpacket_protosw); 1207 inet_unregister_protosw(&sctp_stream_protosw); 1208 err_add_protocol: 1209 proto_unregister(&sctp_prot); 1210 goto out; 1211 } 1212 1213 /* Exit handler for the SCTP protocol. */ 1214 SCTP_STATIC __exit void sctp_exit(void) 1215 { 1216 /* BUG. This should probably do something useful like clean 1217 * up all the remaining associations and all that memory. 1218 */ 1219 1220 /* Unregister notifier for inet address additions/deletions. */ 1221 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1222 1223 /* Free the local address list. */ 1224 sctp_free_local_addr_list(); 1225 1226 /* Free the control endpoint. */ 1227 sock_release(sctp_ctl_socket); 1228 1229 sctp_v6_exit(); 1230 sctp_sysctl_unregister(); 1231 list_del(&sctp_ipv4_specific.list); 1232 1233 free_pages((unsigned long)sctp_assoc_hashtable, 1234 get_order(sctp_assoc_hashsize * 1235 sizeof(struct sctp_hashbucket))); 1236 kfree(sctp_ep_hashtable); 1237 free_pages((unsigned long)sctp_port_hashtable, 1238 get_order(sctp_port_hashsize * 1239 sizeof(struct sctp_bind_hashbucket))); 1240 1241 kmem_cache_destroy(sctp_chunk_cachep); 1242 kmem_cache_destroy(sctp_bucket_cachep); 1243 1244 sctp_dbg_objcnt_exit(); 1245 sctp_proc_exit(); 1246 cleanup_sctp_mibs(); 1247 1248 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1249 inet_unregister_protosw(&sctp_seqpacket_protosw); 1250 inet_unregister_protosw(&sctp_stream_protosw); 1251 proto_unregister(&sctp_prot); 1252 } 1253 1254 module_init(sctp_init); 1255 module_exit(sctp_exit); 1256 1257 /* 1258 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1259 */ 1260 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1261 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1262 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1263 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1264 MODULE_LICENSE("GPL"); 1265