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. */ 64struct sctp_globals sctp_globals __read_mostly; 65struct proc_dir_entry *proc_net_sctp; 66DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; 67 68struct idr sctp_assocs_id; 69DEFINE_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 */ 75static struct socket *sctp_ctl_socket; 76 77static struct sctp_pf *sctp_pf_inet6_specific; 78static struct sctp_pf *sctp_pf_inet_specific; 79static struct sctp_af *sctp_af_v4_specific; 80static struct sctp_af *sctp_af_v6_specific; 81 82struct kmem_cache *sctp_chunk_cachep __read_mostly; 83struct kmem_cache *sctp_bucket_cachep __read_mostly; 84 85/* Return the address of the control sock. */ 86struct 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. */ 92static __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 113out_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 */ 121static 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 */ 136static 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 */ 166static 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_each_netdev(dev) { 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. */ 183static 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'. */ 196int 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 223end_copy: 224 return error; 225} 226 227/* Initialize a sctp_addr from in incoming skb. */ 228static 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 = sctp_hdr(skb); 239 if (is_saddr) { 240 *port = sh->source; 241 from = &ip_hdr(skb)->saddr; 242 } else { 243 *port = sh->dest; 244 from = &ip_hdr(skb)->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. */ 250static 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. */ 258static 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. */ 264static 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. */ 270static 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 */ 282static 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. */ 295static 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. */ 305static 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. */ 319static 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? */ 327static 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 */ 339static 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? */ 355static 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 */ 383static 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 */ 412static 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 492out_unlock: 493 sctp_read_unlock(addr_lock); 494out: 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 */ 507static 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? */ 525static 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? */ 531static int sctp_v4_is_ce(const struct sk_buff *skb) 532{ 533 return INET_ECN_is_ce(ip_hdr(skb)->tos); 534} 535 536/* Create and initialize a new sk for the socket returned by accept(). */ 537static 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 587out: 588 return newsk; 589} 590 591/* Map address, empty for v4 family */ 592static 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. */ 598static 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. */ 604static 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 */ 641static 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. */ 665int 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 */ 690struct 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. */ 703static 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. */ 714static 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. */ 732static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 733{ 734 if (msgname) { 735 struct sctphdr *sh = sctp_hdr(skb); 736 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 737 738 sctp_inet_msgname(msgname, len); 739 sin->sin_port = sh->source; 740 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 741 } 742} 743 744/* Do we support this AF? */ 745static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 746{ 747 /* PF_INET only supports AF_INET addresses. */ 748 return (AF_INET == family); 749} 750 751/* Address matching with wildcards allowed. */ 752static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 753 const union sctp_addr *addr2, 754 struct sctp_sock *opt) 755{ 756 /* PF_INET only supports AF_INET addresses. */ 757 if (addr1->sa.sa_family != addr2->sa.sa_family) 758 return 0; 759 if (INADDR_ANY == addr1->v4.sin_addr.s_addr || 760 INADDR_ANY == addr2->v4.sin_addr.s_addr) 761 return 1; 762 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 763 return 1; 764 765 return 0; 766} 767 768/* Verify that provided sockaddr looks bindable. Common verification has 769 * already been taken care of. 770 */ 771static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 772{ 773 return sctp_v4_available(addr, opt); 774} 775 776/* Verify that sockaddr looks sendable. Common verification has already 777 * been taken care of. 778 */ 779static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 780{ 781 return 1; 782} 783 784/* Fill in Supported Address Type information for INIT and INIT-ACK 785 * chunks. Returns number of addresses supported. 786 */ 787static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 788 __be16 *types) 789{ 790 types[0] = SCTP_PARAM_IPV4_ADDRESS; 791 return 1; 792} 793 794/* Wrapper routine that calls the ip transmit routine. */ 795static inline int sctp_v4_xmit(struct sk_buff *skb, 796 struct sctp_transport *transport, int ipfragok) 797{ 798 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " 799 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n", 800 __FUNCTION__, skb, skb->len, 801 NIPQUAD(((struct rtable *)skb->dst)->rt_src), 802 NIPQUAD(((struct rtable *)skb->dst)->rt_dst)); 803 804 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 805 return ip_queue_xmit(skb, ipfragok); 806} 807 808static struct sctp_af sctp_ipv4_specific; 809 810static struct sctp_pf sctp_pf_inet = { 811 .event_msgname = sctp_inet_event_msgname, 812 .skb_msgname = sctp_inet_skb_msgname, 813 .af_supported = sctp_inet_af_supported, 814 .cmp_addr = sctp_inet_cmp_addr, 815 .bind_verify = sctp_inet_bind_verify, 816 .send_verify = sctp_inet_send_verify, 817 .supported_addrs = sctp_inet_supported_addrs, 818 .create_accept_sk = sctp_v4_create_accept_sk, 819 .addr_v4map = sctp_v4_addr_v4map, 820 .af = &sctp_ipv4_specific, 821}; 822 823/* Notifier for inetaddr addition/deletion events. */ 824static struct notifier_block sctp_inetaddr_notifier = { 825 .notifier_call = sctp_inetaddr_event, 826}; 827 828/* Socket operations. */ 829static const struct proto_ops inet_seqpacket_ops = { 830 .family = PF_INET, 831 .owner = THIS_MODULE, 832 .release = inet_release, /* Needs to be wrapped... */ 833 .bind = inet_bind, 834 .connect = inet_dgram_connect, 835 .socketpair = sock_no_socketpair, 836 .accept = inet_accept, 837 .getname = inet_getname, /* Semantics are different. */ 838 .poll = sctp_poll, 839 .ioctl = inet_ioctl, 840 .listen = sctp_inet_listen, 841 .shutdown = inet_shutdown, /* Looks harmless. */ 842 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 843 .getsockopt = sock_common_getsockopt, 844 .sendmsg = inet_sendmsg, 845 .recvmsg = sock_common_recvmsg, 846 .mmap = sock_no_mmap, 847 .sendpage = sock_no_sendpage, 848#ifdef CONFIG_COMPAT 849 .compat_setsockopt = compat_sock_common_setsockopt, 850 .compat_getsockopt = compat_sock_common_getsockopt, 851#endif 852}; 853 854/* Registration with AF_INET family. */ 855static struct inet_protosw sctp_seqpacket_protosw = { 856 .type = SOCK_SEQPACKET, 857 .protocol = IPPROTO_SCTP, 858 .prot = &sctp_prot, 859 .ops = &inet_seqpacket_ops, 860 .capability = -1, 861 .no_check = 0, 862 .flags = SCTP_PROTOSW_FLAG 863}; 864static struct inet_protosw sctp_stream_protosw = { 865 .type = SOCK_STREAM, 866 .protocol = IPPROTO_SCTP, 867 .prot = &sctp_prot, 868 .ops = &inet_seqpacket_ops, 869 .capability = -1, 870 .no_check = 0, 871 .flags = SCTP_PROTOSW_FLAG 872}; 873 874/* Register with IP layer. */ 875static struct net_protocol sctp_protocol = { 876 .handler = sctp_rcv, 877 .err_handler = sctp_v4_err, 878 .no_policy = 1, 879}; 880 881/* IPv4 address related functions. */ 882static struct sctp_af sctp_ipv4_specific = { 883 .sa_family = AF_INET, 884 .sctp_xmit = sctp_v4_xmit, 885 .setsockopt = ip_setsockopt, 886 .getsockopt = ip_getsockopt, 887 .get_dst = sctp_v4_get_dst, 888 .get_saddr = sctp_v4_get_saddr, 889 .copy_addrlist = sctp_v4_copy_addrlist, 890 .from_skb = sctp_v4_from_skb, 891 .from_sk = sctp_v4_from_sk, 892 .to_sk_saddr = sctp_v4_to_sk_saddr, 893 .to_sk_daddr = sctp_v4_to_sk_daddr, 894 .from_addr_param = sctp_v4_from_addr_param, 895 .to_addr_param = sctp_v4_to_addr_param, 896 .dst_saddr = sctp_v4_dst_saddr, 897 .cmp_addr = sctp_v4_cmp_addr, 898 .addr_valid = sctp_v4_addr_valid, 899 .inaddr_any = sctp_v4_inaddr_any, 900 .is_any = sctp_v4_is_any, 901 .available = sctp_v4_available, 902 .scope = sctp_v4_scope, 903 .skb_iif = sctp_v4_skb_iif, 904 .is_ce = sctp_v4_is_ce, 905 .seq_dump_addr = sctp_v4_seq_dump_addr, 906 .net_header_len = sizeof(struct iphdr), 907 .sockaddr_len = sizeof(struct sockaddr_in), 908#ifdef CONFIG_COMPAT 909 .compat_setsockopt = compat_ip_setsockopt, 910 .compat_getsockopt = compat_ip_getsockopt, 911#endif 912}; 913 914struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 915 916 switch (family) { 917 case PF_INET: 918 return sctp_pf_inet_specific; 919 case PF_INET6: 920 return sctp_pf_inet6_specific; 921 default: 922 return NULL; 923 } 924} 925 926/* Register the PF specific function table. */ 927int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 928{ 929 switch (family) { 930 case PF_INET: 931 if (sctp_pf_inet_specific) 932 return 0; 933 sctp_pf_inet_specific = pf; 934 break; 935 case PF_INET6: 936 if (sctp_pf_inet6_specific) 937 return 0; 938 sctp_pf_inet6_specific = pf; 939 break; 940 default: 941 return 0; 942 } 943 return 1; 944} 945 946static int __init init_sctp_mibs(void) 947{ 948 sctp_statistics[0] = alloc_percpu(struct sctp_mib); 949 if (!sctp_statistics[0]) 950 return -ENOMEM; 951 sctp_statistics[1] = alloc_percpu(struct sctp_mib); 952 if (!sctp_statistics[1]) { 953 free_percpu(sctp_statistics[0]); 954 return -ENOMEM; 955 } 956 return 0; 957 958} 959 960static void cleanup_sctp_mibs(void) 961{ 962 free_percpu(sctp_statistics[0]); 963 free_percpu(sctp_statistics[1]); 964} 965 966/* Initialize the universe into something sensible. */ 967SCTP_STATIC __init int sctp_init(void) 968{ 969 int i; 970 int status = -EINVAL; 971 unsigned long goal; 972 int order; 973 974 /* SCTP_DEBUG sanity check. */ 975 if (!sctp_sanity_check()) 976 goto out; 977 978 /* Allocate bind_bucket and chunk caches. */ 979 status = -ENOBUFS; 980 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 981 sizeof(struct sctp_bind_bucket), 982 0, SLAB_HWCACHE_ALIGN, 983 NULL, NULL); 984 if (!sctp_bucket_cachep) 985 goto out; 986 987 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 988 sizeof(struct sctp_chunk), 989 0, SLAB_HWCACHE_ALIGN, 990 NULL, NULL); 991 if (!sctp_chunk_cachep) 992 goto err_chunk_cachep; 993 994 /* Allocate and initialise sctp mibs. */ 995 status = init_sctp_mibs(); 996 if (status) 997 goto err_init_mibs; 998 999 /* Initialize proc fs directory. */ 1000 status = sctp_proc_init(); 1001 if (status) 1002 goto err_init_proc; 1003 1004 /* Initialize object count debugging. */ 1005 sctp_dbg_objcnt_init(); 1006 1007 /* Initialize the SCTP specific PF functions. */ 1008 sctp_register_pf(&sctp_pf_inet, PF_INET); 1009 /* 1010 * 14. Suggested SCTP Protocol Parameter Values 1011 */ 1012 /* The following protocol parameters are RECOMMENDED: */ 1013 /* RTO.Initial - 3 seconds */ 1014 sctp_rto_initial = SCTP_RTO_INITIAL; 1015 /* RTO.Min - 1 second */ 1016 sctp_rto_min = SCTP_RTO_MIN; 1017 /* RTO.Max - 60 seconds */ 1018 sctp_rto_max = SCTP_RTO_MAX; 1019 /* RTO.Alpha - 1/8 */ 1020 sctp_rto_alpha = SCTP_RTO_ALPHA; 1021 /* RTO.Beta - 1/4 */ 1022 sctp_rto_beta = SCTP_RTO_BETA; 1023 1024 /* Valid.Cookie.Life - 60 seconds */ 1025 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1026 1027 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1028 sctp_cookie_preserve_enable = 1; 1029 1030 /* Max.Burst - 4 */ 1031 sctp_max_burst = SCTP_DEFAULT_MAX_BURST; 1032 1033 /* Association.Max.Retrans - 10 attempts 1034 * Path.Max.Retrans - 5 attempts (per destination address) 1035 * Max.Init.Retransmits - 8 attempts 1036 */ 1037 sctp_max_retrans_association = 10; 1038 sctp_max_retrans_path = 5; 1039 sctp_max_retrans_init = 8; 1040 1041 /* Sendbuffer growth - do per-socket accounting */ 1042 sctp_sndbuf_policy = 0; 1043 1044 /* Rcvbuffer growth - do per-socket accounting */ 1045 sctp_rcvbuf_policy = 0; 1046 1047 /* HB.interval - 30 seconds */ 1048 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1049 1050 /* delayed SACK timeout */ 1051 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1052 1053 /* Implementation specific variables. */ 1054 1055 /* Initialize default stream count setup information. */ 1056 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1057 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1058 1059 /* Initialize handle used for association ids. */ 1060 idr_init(&sctp_assocs_id); 1061 1062 /* Size and allocate the association hash table. 1063 * The methodology is similar to that of the tcp hash tables. 1064 */ 1065 if (num_physpages >= (128 * 1024)) 1066 goal = num_physpages >> (22 - PAGE_SHIFT); 1067 else 1068 goal = num_physpages >> (24 - PAGE_SHIFT); 1069 1070 for (order = 0; (1UL << order) < goal; order++) 1071 ; 1072 1073 do { 1074 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1075 sizeof(struct sctp_hashbucket); 1076 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1077 continue; 1078 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1079 __get_free_pages(GFP_ATOMIC, order); 1080 } while (!sctp_assoc_hashtable && --order > 0); 1081 if (!sctp_assoc_hashtable) { 1082 printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); 1083 status = -ENOMEM; 1084 goto err_ahash_alloc; 1085 } 1086 for (i = 0; i < sctp_assoc_hashsize; i++) { 1087 rwlock_init(&sctp_assoc_hashtable[i].lock); 1088 sctp_assoc_hashtable[i].chain = NULL; 1089 } 1090 1091 /* Allocate and initialize the endpoint hash table. */ 1092 sctp_ep_hashsize = 64; 1093 sctp_ep_hashtable = (struct sctp_hashbucket *) 1094 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1095 if (!sctp_ep_hashtable) { 1096 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); 1097 status = -ENOMEM; 1098 goto err_ehash_alloc; 1099 } 1100 for (i = 0; i < sctp_ep_hashsize; i++) { 1101 rwlock_init(&sctp_ep_hashtable[i].lock); 1102 sctp_ep_hashtable[i].chain = NULL; 1103 } 1104 1105 /* Allocate and initialize the SCTP port hash table. */ 1106 do { 1107 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1108 sizeof(struct sctp_bind_hashbucket); 1109 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1110 continue; 1111 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1112 __get_free_pages(GFP_ATOMIC, order); 1113 } while (!sctp_port_hashtable && --order > 0); 1114 if (!sctp_port_hashtable) { 1115 printk(KERN_ERR "SCTP: Failed bind hash alloc."); 1116 status = -ENOMEM; 1117 goto err_bhash_alloc; 1118 } 1119 for (i = 0; i < sctp_port_hashsize; i++) { 1120 spin_lock_init(&sctp_port_hashtable[i].lock); 1121 sctp_port_hashtable[i].chain = NULL; 1122 } 1123 1124 spin_lock_init(&sctp_port_alloc_lock); 1125 sctp_port_rover = sysctl_local_port_range[0] - 1; 1126 1127 printk(KERN_INFO "SCTP: Hash tables configured " 1128 "(established %d bind %d)\n", 1129 sctp_assoc_hashsize, sctp_port_hashsize); 1130 1131 /* Disable ADDIP by default. */ 1132 sctp_addip_enable = 0; 1133 1134 /* Enable PR-SCTP by default. */ 1135 sctp_prsctp_enable = 1; 1136 1137 sctp_sysctl_register(); 1138 1139 INIT_LIST_HEAD(&sctp_address_families); 1140 sctp_register_af(&sctp_ipv4_specific); 1141 1142 status = proto_register(&sctp_prot, 1); 1143 if (status) 1144 goto err_proto_register; 1145 1146 /* Register SCTP(UDP and TCP style) with socket layer. */ 1147 inet_register_protosw(&sctp_seqpacket_protosw); 1148 inet_register_protosw(&sctp_stream_protosw); 1149 1150 status = sctp_v6_init(); 1151 if (status) 1152 goto err_v6_init; 1153 1154 /* Initialize the control inode/socket for handling OOTB packets. */ 1155 if ((status = sctp_ctl_sock_init())) { 1156 printk (KERN_ERR 1157 "SCTP: Failed to initialize the SCTP control sock.\n"); 1158 goto err_ctl_sock_init; 1159 } 1160 1161 /* Initialize the local address list. */ 1162 INIT_LIST_HEAD(&sctp_local_addr_list); 1163 sctp_get_local_addr_list(); 1164 1165 /* Register notifier for inet address additions/deletions. */ 1166 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1167 1168 /* Register SCTP with inet layer. */ 1169 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) { 1170 status = -EAGAIN; 1171 goto err_add_protocol; 1172 } 1173 1174 /* Register SCTP with inet6 layer. */ 1175 status = sctp_v6_add_protocol(); 1176 if (status) 1177 goto err_v6_add_protocol; 1178 1179 __unsafe(THIS_MODULE); 1180 status = 0; 1181out: 1182 return status; 1183err_v6_add_protocol: 1184 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1185 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1186err_add_protocol: 1187 sctp_free_local_addr_list(); 1188 sock_release(sctp_ctl_socket); 1189err_ctl_sock_init: 1190 sctp_v6_exit(); 1191err_v6_init: 1192 inet_unregister_protosw(&sctp_stream_protosw); 1193 inet_unregister_protosw(&sctp_seqpacket_protosw); 1194 proto_unregister(&sctp_prot); 1195err_proto_register: 1196 sctp_sysctl_unregister(); 1197 list_del(&sctp_ipv4_specific.list); 1198 free_pages((unsigned long)sctp_port_hashtable, 1199 get_order(sctp_port_hashsize * 1200 sizeof(struct sctp_bind_hashbucket))); 1201err_bhash_alloc: 1202 kfree(sctp_ep_hashtable); 1203err_ehash_alloc: 1204 free_pages((unsigned long)sctp_assoc_hashtable, 1205 get_order(sctp_assoc_hashsize * 1206 sizeof(struct sctp_hashbucket))); 1207err_ahash_alloc: 1208 sctp_dbg_objcnt_exit(); 1209 sctp_proc_exit(); 1210err_init_proc: 1211 cleanup_sctp_mibs(); 1212err_init_mibs: 1213 kmem_cache_destroy(sctp_chunk_cachep); 1214err_chunk_cachep: 1215 kmem_cache_destroy(sctp_bucket_cachep); 1216 goto out; 1217} 1218 1219/* Exit handler for the SCTP protocol. */ 1220SCTP_STATIC __exit void sctp_exit(void) 1221{ 1222 /* BUG. This should probably do something useful like clean 1223 * up all the remaining associations and all that memory. 1224 */ 1225 1226 /* Unregister with inet6/inet layers. */ 1227 sctp_v6_del_protocol(); 1228 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1229 1230 /* Free the local address list. */ 1231 sctp_free_local_addr_list(); 1232 1233 /* Free the control endpoint. */ 1234 sock_release(sctp_ctl_socket); 1235 1236 /* Cleanup v6 initializations. */ 1237 sctp_v6_exit(); 1238 1239 /* Unregister with socket layer. */ 1240 inet_unregister_protosw(&sctp_stream_protosw); 1241 inet_unregister_protosw(&sctp_seqpacket_protosw); 1242 1243 /* Unregister notifier for inet address additions/deletions. */ 1244 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1245 1246 sctp_sysctl_unregister(); 1247 list_del(&sctp_ipv4_specific.list); 1248 1249 free_pages((unsigned long)sctp_assoc_hashtable, 1250 get_order(sctp_assoc_hashsize * 1251 sizeof(struct sctp_hashbucket))); 1252 kfree(sctp_ep_hashtable); 1253 free_pages((unsigned long)sctp_port_hashtable, 1254 get_order(sctp_port_hashsize * 1255 sizeof(struct sctp_bind_hashbucket))); 1256 1257 sctp_dbg_objcnt_exit(); 1258 sctp_proc_exit(); 1259 cleanup_sctp_mibs(); 1260 1261 kmem_cache_destroy(sctp_chunk_cachep); 1262 kmem_cache_destroy(sctp_bucket_cachep); 1263 1264 proto_unregister(&sctp_prot); 1265} 1266 1267module_init(sctp_init); 1268module_exit(sctp_exit); 1269 1270/* 1271 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1272 */ 1273MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1274MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1275MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1276MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1277MODULE_LICENSE("GPL"); 1278