1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * Copyright (c) 2001 Nokia, Inc. 7 * Copyright (c) 2001 La Monte H.P. Yarroll 8 * 9 * This file is part of the SCTP kernel implementation 10 * 11 * Initialization/cleanup for SCTP protocol support. 12 * 13 * This SCTP implementation is free software; 14 * you can redistribute it and/or modify it under the terms of 15 * the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 * This SCTP implementation is distributed in the hope that it 20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 21 * ************************ 22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 23 * See the GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with GNU CC; see the file COPYING. If not, write to 27 * the Free Software Foundation, 59 Temple Place - Suite 330, 28 * Boston, MA 02111-1307, USA. 29 * 30 * Please send any bug reports or fixes you make to the 31 * email address(es): 32 * lksctp developers <lksctp-developers@lists.sourceforge.net> 33 * 34 * Or submit a bug report through the following website: 35 * http://www.sf.net/projects/lksctp 36 * 37 * Written or modified by: 38 * La Monte H.P. Yarroll <piggy@acm.org> 39 * Karl Knutson <karl@athena.chicago.il.us> 40 * Jon Grimm <jgrimm@us.ibm.com> 41 * Sridhar Samudrala <sri@us.ibm.com> 42 * Daisy Chang <daisyc@us.ibm.com> 43 * Ardelle Fan <ardelle.fan@intel.com> 44 * 45 * Any bugs reported given to us we will try to fix... any fixes shared will 46 * be incorporated into the next SCTP release. 47 */ 48 49 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 50 51 #include <linux/module.h> 52 #include <linux/init.h> 53 #include <linux/netdevice.h> 54 #include <linux/inetdevice.h> 55 #include <linux/seq_file.h> 56 #include <linux/bootmem.h> 57 #include <linux/highmem.h> 58 #include <linux/swap.h> 59 #include <linux/slab.h> 60 #include <net/net_namespace.h> 61 #include <net/protocol.h> 62 #include <net/ip.h> 63 #include <net/ipv6.h> 64 #include <net/route.h> 65 #include <net/sctp/sctp.h> 66 #include <net/addrconf.h> 67 #include <net/inet_common.h> 68 #include <net/inet_ecn.h> 69 70 /* Global data structures. */ 71 struct sctp_globals sctp_globals __read_mostly; 72 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; 73 74 #ifdef CONFIG_PROC_FS 75 struct proc_dir_entry *proc_net_sctp; 76 #endif 77 78 struct idr sctp_assocs_id; 79 DEFINE_SPINLOCK(sctp_assocs_id_lock); 80 81 /* This is the global socket data structure used for responding to 82 * the Out-of-the-blue (OOTB) packets. A control sock will be created 83 * for this socket at the initialization time. 84 */ 85 static struct sock *sctp_ctl_sock; 86 87 static struct sctp_pf *sctp_pf_inet6_specific; 88 static struct sctp_pf *sctp_pf_inet_specific; 89 static struct sctp_af *sctp_af_v4_specific; 90 static struct sctp_af *sctp_af_v6_specific; 91 92 struct kmem_cache *sctp_chunk_cachep __read_mostly; 93 struct kmem_cache *sctp_bucket_cachep __read_mostly; 94 95 long sysctl_sctp_mem[3]; 96 int sysctl_sctp_rmem[3]; 97 int sysctl_sctp_wmem[3]; 98 99 /* Return the address of the control sock. */ 100 struct sock *sctp_get_ctl_sock(void) 101 { 102 return sctp_ctl_sock; 103 } 104 105 /* Set up the proc fs entry for the SCTP protocol. */ 106 static __init int sctp_proc_init(void) 107 { 108 if (percpu_counter_init(&sctp_sockets_allocated, 0)) 109 goto out_nomem; 110 #ifdef CONFIG_PROC_FS 111 if (!proc_net_sctp) { 112 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net); 113 if (!proc_net_sctp) 114 goto out_free_percpu; 115 } 116 117 if (sctp_snmp_proc_init()) 118 goto out_snmp_proc_init; 119 if (sctp_eps_proc_init()) 120 goto out_eps_proc_init; 121 if (sctp_assocs_proc_init()) 122 goto out_assocs_proc_init; 123 if (sctp_remaddr_proc_init()) 124 goto out_remaddr_proc_init; 125 126 return 0; 127 128 out_remaddr_proc_init: 129 sctp_assocs_proc_exit(); 130 out_assocs_proc_init: 131 sctp_eps_proc_exit(); 132 out_eps_proc_init: 133 sctp_snmp_proc_exit(); 134 out_snmp_proc_init: 135 if (proc_net_sctp) { 136 proc_net_sctp = NULL; 137 remove_proc_entry("sctp", init_net.proc_net); 138 } 139 out_free_percpu: 140 percpu_counter_destroy(&sctp_sockets_allocated); 141 #else 142 return 0; 143 #endif /* CONFIG_PROC_FS */ 144 145 out_nomem: 146 return -ENOMEM; 147 } 148 149 /* Clean up the proc fs entry for the SCTP protocol. 150 * Note: Do not make this __exit as it is used in the init error 151 * path. 152 */ 153 static void sctp_proc_exit(void) 154 { 155 #ifdef CONFIG_PROC_FS 156 sctp_snmp_proc_exit(); 157 sctp_eps_proc_exit(); 158 sctp_assocs_proc_exit(); 159 sctp_remaddr_proc_exit(); 160 161 if (proc_net_sctp) { 162 proc_net_sctp = NULL; 163 remove_proc_entry("sctp", init_net.proc_net); 164 } 165 #endif 166 percpu_counter_destroy(&sctp_sockets_allocated); 167 } 168 169 /* Private helper to extract ipv4 address and stash them in 170 * the protocol structure. 171 */ 172 static void sctp_v4_copy_addrlist(struct list_head *addrlist, 173 struct net_device *dev) 174 { 175 struct in_device *in_dev; 176 struct in_ifaddr *ifa; 177 struct sctp_sockaddr_entry *addr; 178 179 rcu_read_lock(); 180 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 181 rcu_read_unlock(); 182 return; 183 } 184 185 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 186 /* Add the address to the local list. */ 187 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 188 if (addr) { 189 addr->a.v4.sin_family = AF_INET; 190 addr->a.v4.sin_port = 0; 191 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 192 addr->valid = 1; 193 INIT_LIST_HEAD(&addr->list); 194 list_add_tail(&addr->list, addrlist); 195 } 196 } 197 198 rcu_read_unlock(); 199 } 200 201 /* Extract our IP addresses from the system and stash them in the 202 * protocol structure. 203 */ 204 static void sctp_get_local_addr_list(void) 205 { 206 struct net_device *dev; 207 struct list_head *pos; 208 struct sctp_af *af; 209 210 rcu_read_lock(); 211 for_each_netdev_rcu(&init_net, dev) { 212 __list_for_each(pos, &sctp_address_families) { 213 af = list_entry(pos, struct sctp_af, list); 214 af->copy_addrlist(&sctp_local_addr_list, dev); 215 } 216 } 217 rcu_read_unlock(); 218 } 219 220 /* Free the existing local addresses. */ 221 static void sctp_free_local_addr_list(void) 222 { 223 struct sctp_sockaddr_entry *addr; 224 struct list_head *pos, *temp; 225 226 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 227 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 228 list_del(pos); 229 kfree(addr); 230 } 231 } 232 233 /* Copy the local addresses which are valid for 'scope' into 'bp'. */ 234 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, 235 gfp_t gfp, int copy_flags) 236 { 237 struct sctp_sockaddr_entry *addr; 238 int error = 0; 239 240 rcu_read_lock(); 241 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { 242 if (!addr->valid) 243 continue; 244 if (sctp_in_scope(&addr->a, scope)) { 245 /* Now that the address is in scope, check to see if 246 * the address type is really supported by the local 247 * sock as well as the remote peer. 248 */ 249 if ((((AF_INET == addr->a.sa.sa_family) && 250 (copy_flags & SCTP_ADDR4_PEERSUPP))) || 251 (((AF_INET6 == addr->a.sa.sa_family) && 252 (copy_flags & SCTP_ADDR6_ALLOWED) && 253 (copy_flags & SCTP_ADDR6_PEERSUPP)))) { 254 error = sctp_add_bind_addr(bp, &addr->a, 255 SCTP_ADDR_SRC, GFP_ATOMIC); 256 if (error) 257 goto end_copy; 258 } 259 } 260 } 261 262 end_copy: 263 rcu_read_unlock(); 264 return error; 265 } 266 267 /* Initialize a sctp_addr from in incoming skb. */ 268 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 269 int is_saddr) 270 { 271 void *from; 272 __be16 *port; 273 struct sctphdr *sh; 274 275 port = &addr->v4.sin_port; 276 addr->v4.sin_family = AF_INET; 277 278 sh = sctp_hdr(skb); 279 if (is_saddr) { 280 *port = sh->source; 281 from = &ip_hdr(skb)->saddr; 282 } else { 283 *port = sh->dest; 284 from = &ip_hdr(skb)->daddr; 285 } 286 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); 287 } 288 289 /* Initialize an sctp_addr from a socket. */ 290 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 291 { 292 addr->v4.sin_family = AF_INET; 293 addr->v4.sin_port = 0; 294 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; 295 } 296 297 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 298 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 299 { 300 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; 301 } 302 303 /* Initialize sk->sk_daddr from sctp_addr. */ 304 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 305 { 306 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; 307 } 308 309 /* Initialize a sctp_addr from an address parameter. */ 310 static void sctp_v4_from_addr_param(union sctp_addr *addr, 311 union sctp_addr_param *param, 312 __be16 port, int iif) 313 { 314 addr->v4.sin_family = AF_INET; 315 addr->v4.sin_port = port; 316 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 317 } 318 319 /* Initialize an address parameter from a sctp_addr and return the length 320 * of the address parameter. 321 */ 322 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 323 union sctp_addr_param *param) 324 { 325 int length = sizeof(sctp_ipv4addr_param_t); 326 327 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 328 param->v4.param_hdr.length = htons(length); 329 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 330 331 return length; 332 } 333 334 /* Initialize a sctp_addr from a dst_entry. */ 335 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4, 336 __be16 port) 337 { 338 saddr->v4.sin_family = AF_INET; 339 saddr->v4.sin_port = port; 340 saddr->v4.sin_addr.s_addr = fl4->saddr; 341 } 342 343 /* Compare two addresses exactly. */ 344 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 345 const union sctp_addr *addr2) 346 { 347 if (addr1->sa.sa_family != addr2->sa.sa_family) 348 return 0; 349 if (addr1->v4.sin_port != addr2->v4.sin_port) 350 return 0; 351 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 352 return 0; 353 354 return 1; 355 } 356 357 /* Initialize addr struct to INADDR_ANY. */ 358 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 359 { 360 addr->v4.sin_family = AF_INET; 361 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 362 addr->v4.sin_port = port; 363 } 364 365 /* Is this a wildcard address? */ 366 static int sctp_v4_is_any(const union sctp_addr *addr) 367 { 368 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 369 } 370 371 /* This function checks if the address is a valid address to be used for 372 * SCTP binding. 373 * 374 * Output: 375 * Return 0 - If the address is a non-unicast or an illegal address. 376 * Return 1 - If the address is a unicast. 377 */ 378 static int sctp_v4_addr_valid(union sctp_addr *addr, 379 struct sctp_sock *sp, 380 const struct sk_buff *skb) 381 { 382 /* IPv4 addresses not allowed */ 383 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 384 return 0; 385 386 /* Is this a non-unicast address or a unusable SCTP address? */ 387 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 388 return 0; 389 390 /* Is this a broadcast address? */ 391 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) 392 return 0; 393 394 return 1; 395 } 396 397 /* Should this be available for binding? */ 398 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 399 { 400 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); 401 402 403 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 404 ret != RTN_LOCAL && 405 !sp->inet.freebind && 406 !sysctl_ip_nonlocal_bind) 407 return 0; 408 409 if (ipv6_only_sock(sctp_opt2sk(sp))) 410 return 0; 411 412 return 1; 413 } 414 415 /* Checking the loopback, private and other address scopes as defined in 416 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 417 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 418 * 419 * Level 0 - unusable SCTP addresses 420 * Level 1 - loopback address 421 * Level 2 - link-local addresses 422 * Level 3 - private addresses. 423 * Level 4 - global addresses 424 * For INIT and INIT-ACK address list, let L be the level of 425 * of requested destination address, sender and receiver 426 * SHOULD include all of its addresses with level greater 427 * than or equal to L. 428 * 429 * IPv4 scoping can be controlled through sysctl option 430 * net.sctp.addr_scope_policy 431 */ 432 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 433 { 434 sctp_scope_t retval; 435 436 /* Check for unusable SCTP addresses. */ 437 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 438 retval = SCTP_SCOPE_UNUSABLE; 439 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 440 retval = SCTP_SCOPE_LOOPBACK; 441 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 442 retval = SCTP_SCOPE_LINK; 443 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 444 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 445 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { 446 retval = SCTP_SCOPE_PRIVATE; 447 } else { 448 retval = SCTP_SCOPE_GLOBAL; 449 } 450 451 return retval; 452 } 453 454 /* Returns a valid dst cache entry for the given source and destination ip 455 * addresses. If an association is passed, trys to get a dst entry with a 456 * source address that matches an address in the bind address list. 457 */ 458 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr, 459 struct flowi *fl, struct sock *sk) 460 { 461 struct sctp_association *asoc = t->asoc; 462 struct rtable *rt; 463 struct flowi4 *fl4 = &fl->u.ip4; 464 struct sctp_bind_addr *bp; 465 struct sctp_sockaddr_entry *laddr; 466 struct dst_entry *dst = NULL; 467 union sctp_addr *daddr = &t->ipaddr; 468 union sctp_addr dst_saddr; 469 470 memset(fl4, 0x0, sizeof(struct flowi4)); 471 fl4->daddr = daddr->v4.sin_addr.s_addr; 472 fl4->fl4_dport = daddr->v4.sin_port; 473 fl4->flowi4_proto = IPPROTO_SCTP; 474 if (asoc) { 475 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk); 476 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if; 477 fl4->fl4_sport = htons(asoc->base.bind_addr.port); 478 } 479 if (saddr) { 480 fl4->saddr = saddr->v4.sin_addr.s_addr; 481 fl4->fl4_sport = saddr->v4.sin_port; 482 } 483 484 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", 485 __func__, &fl4->daddr, &fl4->saddr); 486 487 rt = ip_route_output_key(&init_net, fl4); 488 if (!IS_ERR(rt)) 489 dst = &rt->dst; 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, fl4, 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_DEL) || 507 (laddr->state != SCTP_ADDR_SRC && 508 !asoc->src_out_of_asoc_ok)) 509 continue; 510 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 511 goto out_unlock; 512 } 513 rcu_read_unlock(); 514 515 /* None of the bound addresses match the source address of the 516 * dst. So release it. 517 */ 518 dst_release(dst); 519 dst = NULL; 520 } 521 522 /* Walk through the bind address list and try to get a dst that 523 * matches a bind address as the source address. 524 */ 525 rcu_read_lock(); 526 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 527 if (!laddr->valid) 528 continue; 529 if ((laddr->state == SCTP_ADDR_SRC) && 530 (AF_INET == laddr->a.sa.sa_family)) { 531 fl4->saddr = laddr->a.v4.sin_addr.s_addr; 532 fl4->fl4_sport = laddr->a.v4.sin_port; 533 rt = ip_route_output_key(&init_net, fl4); 534 if (!IS_ERR(rt)) { 535 dst = &rt->dst; 536 goto out_unlock; 537 } 538 } 539 } 540 541 out_unlock: 542 rcu_read_unlock(); 543 out: 544 t->dst = dst; 545 if (dst) 546 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", 547 &fl4->daddr, &fl4->saddr); 548 else 549 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 550 } 551 552 /* For v4, the source address is cached in the route entry(dst). So no need 553 * to cache it separately and hence this is an empty routine. 554 */ 555 static void sctp_v4_get_saddr(struct sctp_sock *sk, 556 struct sctp_transport *t, 557 struct flowi *fl) 558 { 559 union sctp_addr *saddr = &t->saddr; 560 struct rtable *rt = (struct rtable *)t->dst; 561 562 if (rt) { 563 saddr->v4.sin_family = AF_INET; 564 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; 565 } 566 } 567 568 /* What interface did this skb arrive on? */ 569 static int sctp_v4_skb_iif(const struct sk_buff *skb) 570 { 571 return skb_rtable(skb)->rt_iif; 572 } 573 574 /* Was this packet marked by Explicit Congestion Notification? */ 575 static int sctp_v4_is_ce(const struct sk_buff *skb) 576 { 577 return INET_ECN_is_ce(ip_hdr(skb)->tos); 578 } 579 580 /* Create and initialize a new sk for the socket returned by accept(). */ 581 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 582 struct sctp_association *asoc) 583 { 584 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 585 sk->sk_prot); 586 struct inet_sock *newinet; 587 588 if (!newsk) 589 goto out; 590 591 sock_init_data(NULL, newsk); 592 593 sctp_copy_sock(newsk, sk, asoc); 594 sock_reset_flag(newsk, SOCK_ZAPPED); 595 596 newinet = inet_sk(newsk); 597 598 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 599 600 sk_refcnt_debug_inc(newsk); 601 602 if (newsk->sk_prot->init(newsk)) { 603 sk_common_release(newsk); 604 newsk = NULL; 605 } 606 607 out: 608 return newsk; 609 } 610 611 /* Map address, empty for v4 family */ 612 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 613 { 614 /* Empty */ 615 } 616 617 /* Dump the v4 addr to the seq file. */ 618 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 619 { 620 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 621 } 622 623 static void sctp_v4_ecn_capable(struct sock *sk) 624 { 625 INET_ECN_xmit(sk); 626 } 627 628 void sctp_addr_wq_timeout_handler(unsigned long arg) 629 { 630 struct sctp_sockaddr_entry *addrw, *temp; 631 struct sctp_sock *sp; 632 633 spin_lock_bh(&sctp_addr_wq_lock); 634 635 list_for_each_entry_safe(addrw, temp, &sctp_addr_waitq, list) { 636 SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ", 637 " for cmd %d at entry %p\n", &sctp_addr_waitq, &addrw->a, addrw->state, 638 addrw); 639 640 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 641 /* Now we send an ASCONF for each association */ 642 /* Note. we currently don't handle link local IPv6 addressees */ 643 if (addrw->a.sa.sa_family == AF_INET6) { 644 struct in6_addr *in6; 645 646 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) & 647 IPV6_ADDR_LINKLOCAL) 648 goto free_next; 649 650 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr; 651 if (ipv6_chk_addr(&init_net, in6, NULL, 0) == 0 && 652 addrw->state == SCTP_ADDR_NEW) { 653 unsigned long timeo_val; 654 655 SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n", 656 SCTP_ADDRESS_TICK_DELAY); 657 timeo_val = jiffies; 658 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 659 mod_timer(&sctp_addr_wq_timer, timeo_val); 660 break; 661 } 662 } 663 #endif 664 list_for_each_entry(sp, &sctp_auto_asconf_splist, auto_asconf_list) { 665 struct sock *sk; 666 667 sk = sctp_opt2sk(sp); 668 /* ignore bound-specific endpoints */ 669 if (!sctp_is_ep_boundall(sk)) 670 continue; 671 sctp_bh_lock_sock(sk); 672 if (sctp_asconf_mgmt(sp, addrw) < 0) 673 SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n"); 674 sctp_bh_unlock_sock(sk); 675 } 676 free_next: 677 list_del(&addrw->list); 678 kfree(addrw); 679 } 680 spin_unlock_bh(&sctp_addr_wq_lock); 681 } 682 683 static void sctp_free_addr_wq(void) 684 { 685 struct sctp_sockaddr_entry *addrw; 686 struct sctp_sockaddr_entry *temp; 687 688 spin_lock_bh(&sctp_addr_wq_lock); 689 del_timer(&sctp_addr_wq_timer); 690 list_for_each_entry_safe(addrw, temp, &sctp_addr_waitq, list) { 691 list_del(&addrw->list); 692 kfree(addrw); 693 } 694 spin_unlock_bh(&sctp_addr_wq_lock); 695 } 696 697 /* lookup the entry for the same address in the addr_waitq 698 * sctp_addr_wq MUST be locked 699 */ 700 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct sctp_sockaddr_entry *addr) 701 { 702 struct sctp_sockaddr_entry *addrw; 703 704 list_for_each_entry(addrw, &sctp_addr_waitq, list) { 705 if (addrw->a.sa.sa_family != addr->a.sa.sa_family) 706 continue; 707 if (addrw->a.sa.sa_family == AF_INET) { 708 if (addrw->a.v4.sin_addr.s_addr == 709 addr->a.v4.sin_addr.s_addr) 710 return addrw; 711 } else if (addrw->a.sa.sa_family == AF_INET6) { 712 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr, 713 &addr->a.v6.sin6_addr)) 714 return addrw; 715 } 716 } 717 return NULL; 718 } 719 720 void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry *addr, int cmd) 721 { 722 struct sctp_sockaddr_entry *addrw; 723 unsigned long timeo_val; 724 725 /* first, we check if an opposite message already exist in the queue. 726 * If we found such message, it is removed. 727 * This operation is a bit stupid, but the DHCP client attaches the 728 * new address after a couple of addition and deletion of that address 729 */ 730 731 spin_lock_bh(&sctp_addr_wq_lock); 732 /* Offsets existing events in addr_wq */ 733 addrw = sctp_addr_wq_lookup(addr); 734 if (addrw) { 735 if (addrw->state != cmd) { 736 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ", 737 " in wq %p\n", addrw->state, &addrw->a, 738 &sctp_addr_waitq); 739 list_del(&addrw->list); 740 kfree(addrw); 741 } 742 spin_unlock_bh(&sctp_addr_wq_lock); 743 return; 744 } 745 746 /* OK, we have to add the new address to the wait queue */ 747 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 748 if (addrw == NULL) { 749 spin_unlock_bh(&sctp_addr_wq_lock); 750 return; 751 } 752 addrw->state = cmd; 753 list_add_tail(&addrw->list, &sctp_addr_waitq); 754 SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ", 755 " in wq %p\n", addrw->state, &addrw->a, &sctp_addr_waitq); 756 757 if (!timer_pending(&sctp_addr_wq_timer)) { 758 timeo_val = jiffies; 759 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 760 mod_timer(&sctp_addr_wq_timer, timeo_val); 761 } 762 spin_unlock_bh(&sctp_addr_wq_lock); 763 } 764 765 /* Event handler for inet address addition/deletion events. 766 * The sctp_local_addr_list needs to be protocted by a spin lock since 767 * multiple notifiers (say IPv4 and IPv6) may be running at the same 768 * time and thus corrupt the list. 769 * The reader side is protected with RCU. 770 */ 771 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 772 void *ptr) 773 { 774 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 775 struct sctp_sockaddr_entry *addr = NULL; 776 struct sctp_sockaddr_entry *temp; 777 int found = 0; 778 779 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net)) 780 return NOTIFY_DONE; 781 782 switch (ev) { 783 case NETDEV_UP: 784 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 785 if (addr) { 786 addr->a.v4.sin_family = AF_INET; 787 addr->a.v4.sin_port = 0; 788 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 789 addr->valid = 1; 790 spin_lock_bh(&sctp_local_addr_lock); 791 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 792 sctp_addr_wq_mgmt(addr, SCTP_ADDR_NEW); 793 spin_unlock_bh(&sctp_local_addr_lock); 794 } 795 break; 796 case NETDEV_DOWN: 797 spin_lock_bh(&sctp_local_addr_lock); 798 list_for_each_entry_safe(addr, temp, 799 &sctp_local_addr_list, list) { 800 if (addr->a.sa.sa_family == AF_INET && 801 addr->a.v4.sin_addr.s_addr == 802 ifa->ifa_local) { 803 sctp_addr_wq_mgmt(addr, SCTP_ADDR_DEL); 804 found = 1; 805 addr->valid = 0; 806 list_del_rcu(&addr->list); 807 break; 808 } 809 } 810 spin_unlock_bh(&sctp_local_addr_lock); 811 if (found) 812 kfree_rcu(addr, rcu); 813 break; 814 } 815 816 return NOTIFY_DONE; 817 } 818 819 /* 820 * Initialize the control inode/socket with a control endpoint data 821 * structure. This endpoint is reserved exclusively for the OOTB processing. 822 */ 823 static int sctp_ctl_sock_init(void) 824 { 825 int err; 826 sa_family_t family = PF_INET; 827 828 if (sctp_get_pf_specific(PF_INET6)) 829 family = PF_INET6; 830 831 err = inet_ctl_sock_create(&sctp_ctl_sock, family, 832 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); 833 834 /* If IPv6 socket could not be created, try the IPv4 socket */ 835 if (err < 0 && family == PF_INET6) 836 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET, 837 SOCK_SEQPACKET, IPPROTO_SCTP, 838 &init_net); 839 840 if (err < 0) { 841 pr_err("Failed to create the SCTP control socket\n"); 842 return err; 843 } 844 return 0; 845 } 846 847 /* Register address family specific functions. */ 848 int sctp_register_af(struct sctp_af *af) 849 { 850 switch (af->sa_family) { 851 case AF_INET: 852 if (sctp_af_v4_specific) 853 return 0; 854 sctp_af_v4_specific = af; 855 break; 856 case AF_INET6: 857 if (sctp_af_v6_specific) 858 return 0; 859 sctp_af_v6_specific = af; 860 break; 861 default: 862 return 0; 863 } 864 865 INIT_LIST_HEAD(&af->list); 866 list_add_tail(&af->list, &sctp_address_families); 867 return 1; 868 } 869 870 /* Get the table of functions for manipulating a particular address 871 * family. 872 */ 873 struct sctp_af *sctp_get_af_specific(sa_family_t family) 874 { 875 switch (family) { 876 case AF_INET: 877 return sctp_af_v4_specific; 878 case AF_INET6: 879 return sctp_af_v6_specific; 880 default: 881 return NULL; 882 } 883 } 884 885 /* Common code to initialize a AF_INET msg_name. */ 886 static void sctp_inet_msgname(char *msgname, int *addr_len) 887 { 888 struct sockaddr_in *sin; 889 890 sin = (struct sockaddr_in *)msgname; 891 *addr_len = sizeof(struct sockaddr_in); 892 sin->sin_family = AF_INET; 893 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 894 } 895 896 /* Copy the primary address of the peer primary address as the msg_name. */ 897 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 898 int *addr_len) 899 { 900 struct sockaddr_in *sin, *sinfrom; 901 902 if (msgname) { 903 struct sctp_association *asoc; 904 905 asoc = event->asoc; 906 sctp_inet_msgname(msgname, addr_len); 907 sin = (struct sockaddr_in *)msgname; 908 sinfrom = &asoc->peer.primary_addr.v4; 909 sin->sin_port = htons(asoc->peer.port); 910 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 911 } 912 } 913 914 /* Initialize and copy out a msgname from an inbound skb. */ 915 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 916 { 917 if (msgname) { 918 struct sctphdr *sh = sctp_hdr(skb); 919 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 920 921 sctp_inet_msgname(msgname, len); 922 sin->sin_port = sh->source; 923 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 924 } 925 } 926 927 /* Do we support this AF? */ 928 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 929 { 930 /* PF_INET only supports AF_INET addresses. */ 931 return AF_INET == family; 932 } 933 934 /* Address matching with wildcards allowed. */ 935 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 936 const union sctp_addr *addr2, 937 struct sctp_sock *opt) 938 { 939 /* PF_INET only supports AF_INET addresses. */ 940 if (addr1->sa.sa_family != addr2->sa.sa_family) 941 return 0; 942 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 943 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 944 return 1; 945 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 946 return 1; 947 948 return 0; 949 } 950 951 /* Verify that provided sockaddr looks bindable. Common verification has 952 * already been taken care of. 953 */ 954 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 955 { 956 return sctp_v4_available(addr, opt); 957 } 958 959 /* Verify that sockaddr looks sendable. Common verification has already 960 * been taken care of. 961 */ 962 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 963 { 964 return 1; 965 } 966 967 /* Fill in Supported Address Type information for INIT and INIT-ACK 968 * chunks. Returns number of addresses supported. 969 */ 970 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 971 __be16 *types) 972 { 973 types[0] = SCTP_PARAM_IPV4_ADDRESS; 974 return 1; 975 } 976 977 /* Wrapper routine that calls the ip transmit routine. */ 978 static inline int sctp_v4_xmit(struct sk_buff *skb, 979 struct sctp_transport *transport) 980 { 981 struct inet_sock *inet = inet_sk(skb->sk); 982 983 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", 984 __func__, skb, skb->len, 985 &transport->fl.u.ip4.saddr, 986 &transport->fl.u.ip4.daddr); 987 988 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 989 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 990 991 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 992 return ip_queue_xmit(skb, &transport->fl); 993 } 994 995 static struct sctp_af sctp_af_inet; 996 997 static struct sctp_pf sctp_pf_inet = { 998 .event_msgname = sctp_inet_event_msgname, 999 .skb_msgname = sctp_inet_skb_msgname, 1000 .af_supported = sctp_inet_af_supported, 1001 .cmp_addr = sctp_inet_cmp_addr, 1002 .bind_verify = sctp_inet_bind_verify, 1003 .send_verify = sctp_inet_send_verify, 1004 .supported_addrs = sctp_inet_supported_addrs, 1005 .create_accept_sk = sctp_v4_create_accept_sk, 1006 .addr_v4map = sctp_v4_addr_v4map, 1007 .af = &sctp_af_inet 1008 }; 1009 1010 /* Notifier for inetaddr addition/deletion events. */ 1011 static struct notifier_block sctp_inetaddr_notifier = { 1012 .notifier_call = sctp_inetaddr_event, 1013 }; 1014 1015 /* Socket operations. */ 1016 static const struct proto_ops inet_seqpacket_ops = { 1017 .family = PF_INET, 1018 .owner = THIS_MODULE, 1019 .release = inet_release, /* Needs to be wrapped... */ 1020 .bind = inet_bind, 1021 .connect = inet_dgram_connect, 1022 .socketpair = sock_no_socketpair, 1023 .accept = inet_accept, 1024 .getname = inet_getname, /* Semantics are different. */ 1025 .poll = sctp_poll, 1026 .ioctl = inet_ioctl, 1027 .listen = sctp_inet_listen, 1028 .shutdown = inet_shutdown, /* Looks harmless. */ 1029 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 1030 .getsockopt = sock_common_getsockopt, 1031 .sendmsg = inet_sendmsg, 1032 .recvmsg = sock_common_recvmsg, 1033 .mmap = sock_no_mmap, 1034 .sendpage = sock_no_sendpage, 1035 #ifdef CONFIG_COMPAT 1036 .compat_setsockopt = compat_sock_common_setsockopt, 1037 .compat_getsockopt = compat_sock_common_getsockopt, 1038 #endif 1039 }; 1040 1041 /* Registration with AF_INET family. */ 1042 static struct inet_protosw sctp_seqpacket_protosw = { 1043 .type = SOCK_SEQPACKET, 1044 .protocol = IPPROTO_SCTP, 1045 .prot = &sctp_prot, 1046 .ops = &inet_seqpacket_ops, 1047 .no_check = 0, 1048 .flags = SCTP_PROTOSW_FLAG 1049 }; 1050 static struct inet_protosw sctp_stream_protosw = { 1051 .type = SOCK_STREAM, 1052 .protocol = IPPROTO_SCTP, 1053 .prot = &sctp_prot, 1054 .ops = &inet_seqpacket_ops, 1055 .no_check = 0, 1056 .flags = SCTP_PROTOSW_FLAG 1057 }; 1058 1059 /* Register with IP layer. */ 1060 static const struct net_protocol sctp_protocol = { 1061 .handler = sctp_rcv, 1062 .err_handler = sctp_v4_err, 1063 .no_policy = 1, 1064 }; 1065 1066 /* IPv4 address related functions. */ 1067 static struct sctp_af sctp_af_inet = { 1068 .sa_family = AF_INET, 1069 .sctp_xmit = sctp_v4_xmit, 1070 .setsockopt = ip_setsockopt, 1071 .getsockopt = ip_getsockopt, 1072 .get_dst = sctp_v4_get_dst, 1073 .get_saddr = sctp_v4_get_saddr, 1074 .copy_addrlist = sctp_v4_copy_addrlist, 1075 .from_skb = sctp_v4_from_skb, 1076 .from_sk = sctp_v4_from_sk, 1077 .to_sk_saddr = sctp_v4_to_sk_saddr, 1078 .to_sk_daddr = sctp_v4_to_sk_daddr, 1079 .from_addr_param = sctp_v4_from_addr_param, 1080 .to_addr_param = sctp_v4_to_addr_param, 1081 .cmp_addr = sctp_v4_cmp_addr, 1082 .addr_valid = sctp_v4_addr_valid, 1083 .inaddr_any = sctp_v4_inaddr_any, 1084 .is_any = sctp_v4_is_any, 1085 .available = sctp_v4_available, 1086 .scope = sctp_v4_scope, 1087 .skb_iif = sctp_v4_skb_iif, 1088 .is_ce = sctp_v4_is_ce, 1089 .seq_dump_addr = sctp_v4_seq_dump_addr, 1090 .ecn_capable = sctp_v4_ecn_capable, 1091 .net_header_len = sizeof(struct iphdr), 1092 .sockaddr_len = sizeof(struct sockaddr_in), 1093 #ifdef CONFIG_COMPAT 1094 .compat_setsockopt = compat_ip_setsockopt, 1095 .compat_getsockopt = compat_ip_getsockopt, 1096 #endif 1097 }; 1098 1099 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 1100 1101 switch (family) { 1102 case PF_INET: 1103 return sctp_pf_inet_specific; 1104 case PF_INET6: 1105 return sctp_pf_inet6_specific; 1106 default: 1107 return NULL; 1108 } 1109 } 1110 1111 /* Register the PF specific function table. */ 1112 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 1113 { 1114 switch (family) { 1115 case PF_INET: 1116 if (sctp_pf_inet_specific) 1117 return 0; 1118 sctp_pf_inet_specific = pf; 1119 break; 1120 case PF_INET6: 1121 if (sctp_pf_inet6_specific) 1122 return 0; 1123 sctp_pf_inet6_specific = pf; 1124 break; 1125 default: 1126 return 0; 1127 } 1128 return 1; 1129 } 1130 1131 static inline int init_sctp_mibs(void) 1132 { 1133 return snmp_mib_init((void __percpu **)sctp_statistics, 1134 sizeof(struct sctp_mib), 1135 __alignof__(struct sctp_mib)); 1136 } 1137 1138 static inline void cleanup_sctp_mibs(void) 1139 { 1140 snmp_mib_free((void __percpu **)sctp_statistics); 1141 } 1142 1143 static void sctp_v4_pf_init(void) 1144 { 1145 /* Initialize the SCTP specific PF functions. */ 1146 sctp_register_pf(&sctp_pf_inet, PF_INET); 1147 sctp_register_af(&sctp_af_inet); 1148 } 1149 1150 static void sctp_v4_pf_exit(void) 1151 { 1152 list_del(&sctp_af_inet.list); 1153 } 1154 1155 static int sctp_v4_protosw_init(void) 1156 { 1157 int rc; 1158 1159 rc = proto_register(&sctp_prot, 1); 1160 if (rc) 1161 return rc; 1162 1163 /* Register SCTP(UDP and TCP style) with socket layer. */ 1164 inet_register_protosw(&sctp_seqpacket_protosw); 1165 inet_register_protosw(&sctp_stream_protosw); 1166 1167 return 0; 1168 } 1169 1170 static void sctp_v4_protosw_exit(void) 1171 { 1172 inet_unregister_protosw(&sctp_stream_protosw); 1173 inet_unregister_protosw(&sctp_seqpacket_protosw); 1174 proto_unregister(&sctp_prot); 1175 } 1176 1177 static int sctp_v4_add_protocol(void) 1178 { 1179 /* Register notifier for inet address additions/deletions. */ 1180 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1181 1182 /* Register SCTP with inet layer. */ 1183 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1184 return -EAGAIN; 1185 1186 return 0; 1187 } 1188 1189 static void sctp_v4_del_protocol(void) 1190 { 1191 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1192 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1193 } 1194 1195 /* Initialize the universe into something sensible. */ 1196 SCTP_STATIC __init int sctp_init(void) 1197 { 1198 int i; 1199 int status = -EINVAL; 1200 unsigned long goal; 1201 unsigned long limit; 1202 int max_share; 1203 int order; 1204 1205 /* SCTP_DEBUG sanity check. */ 1206 if (!sctp_sanity_check()) 1207 goto out; 1208 1209 /* Allocate bind_bucket and chunk caches. */ 1210 status = -ENOBUFS; 1211 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1212 sizeof(struct sctp_bind_bucket), 1213 0, SLAB_HWCACHE_ALIGN, 1214 NULL); 1215 if (!sctp_bucket_cachep) 1216 goto out; 1217 1218 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1219 sizeof(struct sctp_chunk), 1220 0, SLAB_HWCACHE_ALIGN, 1221 NULL); 1222 if (!sctp_chunk_cachep) 1223 goto err_chunk_cachep; 1224 1225 /* Allocate and initialise sctp mibs. */ 1226 status = init_sctp_mibs(); 1227 if (status) 1228 goto err_init_mibs; 1229 1230 /* Initialize proc fs directory. */ 1231 status = sctp_proc_init(); 1232 if (status) 1233 goto err_init_proc; 1234 1235 /* Initialize object count debugging. */ 1236 sctp_dbg_objcnt_init(); 1237 1238 /* 1239 * 14. Suggested SCTP Protocol Parameter Values 1240 */ 1241 /* The following protocol parameters are RECOMMENDED: */ 1242 /* RTO.Initial - 3 seconds */ 1243 sctp_rto_initial = SCTP_RTO_INITIAL; 1244 /* RTO.Min - 1 second */ 1245 sctp_rto_min = SCTP_RTO_MIN; 1246 /* RTO.Max - 60 seconds */ 1247 sctp_rto_max = SCTP_RTO_MAX; 1248 /* RTO.Alpha - 1/8 */ 1249 sctp_rto_alpha = SCTP_RTO_ALPHA; 1250 /* RTO.Beta - 1/4 */ 1251 sctp_rto_beta = SCTP_RTO_BETA; 1252 1253 /* Valid.Cookie.Life - 60 seconds */ 1254 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1255 1256 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1257 sctp_cookie_preserve_enable = 1; 1258 1259 /* Max.Burst - 4 */ 1260 sctp_max_burst = SCTP_DEFAULT_MAX_BURST; 1261 1262 /* Association.Max.Retrans - 10 attempts 1263 * Path.Max.Retrans - 5 attempts (per destination address) 1264 * Max.Init.Retransmits - 8 attempts 1265 */ 1266 sctp_max_retrans_association = 10; 1267 sctp_max_retrans_path = 5; 1268 sctp_max_retrans_init = 8; 1269 1270 /* Sendbuffer growth - do per-socket accounting */ 1271 sctp_sndbuf_policy = 0; 1272 1273 /* Rcvbuffer growth - do per-socket accounting */ 1274 sctp_rcvbuf_policy = 0; 1275 1276 /* HB.interval - 30 seconds */ 1277 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1278 1279 /* delayed SACK timeout */ 1280 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1281 1282 /* Implementation specific variables. */ 1283 1284 /* Initialize default stream count setup information. */ 1285 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1286 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1287 1288 /* Initialize handle used for association ids. */ 1289 idr_init(&sctp_assocs_id); 1290 1291 limit = nr_free_buffer_pages() / 8; 1292 limit = max(limit, 128UL); 1293 sysctl_sctp_mem[0] = limit / 4 * 3; 1294 sysctl_sctp_mem[1] = limit; 1295 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1296 1297 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1298 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1299 max_share = min(4UL*1024*1024, limit); 1300 1301 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1302 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); 1303 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1304 1305 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1306 sysctl_sctp_wmem[1] = 16*1024; 1307 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1308 1309 /* Size and allocate the association hash table. 1310 * The methodology is similar to that of the tcp hash tables. 1311 */ 1312 if (totalram_pages >= (128 * 1024)) 1313 goal = totalram_pages >> (22 - PAGE_SHIFT); 1314 else 1315 goal = totalram_pages >> (24 - PAGE_SHIFT); 1316 1317 for (order = 0; (1UL << order) < goal; order++) 1318 ; 1319 1320 do { 1321 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1322 sizeof(struct sctp_hashbucket); 1323 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1324 continue; 1325 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1326 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); 1327 } while (!sctp_assoc_hashtable && --order > 0); 1328 if (!sctp_assoc_hashtable) { 1329 pr_err("Failed association hash alloc\n"); 1330 status = -ENOMEM; 1331 goto err_ahash_alloc; 1332 } 1333 for (i = 0; i < sctp_assoc_hashsize; i++) { 1334 rwlock_init(&sctp_assoc_hashtable[i].lock); 1335 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1336 } 1337 1338 /* Allocate and initialize the endpoint hash table. */ 1339 sctp_ep_hashsize = 64; 1340 sctp_ep_hashtable = (struct sctp_hashbucket *) 1341 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1342 if (!sctp_ep_hashtable) { 1343 pr_err("Failed endpoint_hash alloc\n"); 1344 status = -ENOMEM; 1345 goto err_ehash_alloc; 1346 } 1347 for (i = 0; i < sctp_ep_hashsize; i++) { 1348 rwlock_init(&sctp_ep_hashtable[i].lock); 1349 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1350 } 1351 1352 /* Allocate and initialize the SCTP port hash table. */ 1353 do { 1354 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1355 sizeof(struct sctp_bind_hashbucket); 1356 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1357 continue; 1358 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1359 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); 1360 } while (!sctp_port_hashtable && --order > 0); 1361 if (!sctp_port_hashtable) { 1362 pr_err("Failed bind hash alloc\n"); 1363 status = -ENOMEM; 1364 goto err_bhash_alloc; 1365 } 1366 for (i = 0; i < sctp_port_hashsize; i++) { 1367 spin_lock_init(&sctp_port_hashtable[i].lock); 1368 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1369 } 1370 1371 pr_info("Hash tables configured (established %d bind %d)\n", 1372 sctp_assoc_hashsize, sctp_port_hashsize); 1373 1374 /* Disable ADDIP by default. */ 1375 sctp_addip_enable = 0; 1376 sctp_addip_noauth = 0; 1377 sctp_default_auto_asconf = 0; 1378 1379 /* Enable PR-SCTP by default. */ 1380 sctp_prsctp_enable = 1; 1381 1382 /* Disable AUTH by default. */ 1383 sctp_auth_enable = 0; 1384 1385 /* Set SCOPE policy to enabled */ 1386 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE; 1387 1388 /* Set the default rwnd update threshold */ 1389 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; 1390 1391 sctp_sysctl_register(); 1392 1393 INIT_LIST_HEAD(&sctp_address_families); 1394 sctp_v4_pf_init(); 1395 sctp_v6_pf_init(); 1396 1397 /* Initialize the local address list. */ 1398 INIT_LIST_HEAD(&sctp_local_addr_list); 1399 spin_lock_init(&sctp_local_addr_lock); 1400 sctp_get_local_addr_list(); 1401 1402 /* Initialize the address event list */ 1403 INIT_LIST_HEAD(&sctp_addr_waitq); 1404 INIT_LIST_HEAD(&sctp_auto_asconf_splist); 1405 spin_lock_init(&sctp_addr_wq_lock); 1406 sctp_addr_wq_timer.expires = 0; 1407 setup_timer(&sctp_addr_wq_timer, sctp_addr_wq_timeout_handler, 0); 1408 1409 status = sctp_v4_protosw_init(); 1410 1411 if (status) 1412 goto err_protosw_init; 1413 1414 status = sctp_v6_protosw_init(); 1415 if (status) 1416 goto err_v6_protosw_init; 1417 1418 /* Initialize the control inode/socket for handling OOTB packets. */ 1419 if ((status = sctp_ctl_sock_init())) { 1420 pr_err("Failed to initialize the SCTP control sock\n"); 1421 goto err_ctl_sock_init; 1422 } 1423 1424 status = sctp_v4_add_protocol(); 1425 if (status) 1426 goto err_add_protocol; 1427 1428 /* Register SCTP with inet6 layer. */ 1429 status = sctp_v6_add_protocol(); 1430 if (status) 1431 goto err_v6_add_protocol; 1432 1433 status = 0; 1434 out: 1435 return status; 1436 err_v6_add_protocol: 1437 sctp_v4_del_protocol(); 1438 err_add_protocol: 1439 inet_ctl_sock_destroy(sctp_ctl_sock); 1440 err_ctl_sock_init: 1441 sctp_v6_protosw_exit(); 1442 err_v6_protosw_init: 1443 sctp_v4_protosw_exit(); 1444 err_protosw_init: 1445 sctp_free_local_addr_list(); 1446 sctp_v4_pf_exit(); 1447 sctp_v6_pf_exit(); 1448 sctp_sysctl_unregister(); 1449 free_pages((unsigned long)sctp_port_hashtable, 1450 get_order(sctp_port_hashsize * 1451 sizeof(struct sctp_bind_hashbucket))); 1452 err_bhash_alloc: 1453 kfree(sctp_ep_hashtable); 1454 err_ehash_alloc: 1455 free_pages((unsigned long)sctp_assoc_hashtable, 1456 get_order(sctp_assoc_hashsize * 1457 sizeof(struct sctp_hashbucket))); 1458 err_ahash_alloc: 1459 sctp_dbg_objcnt_exit(); 1460 sctp_proc_exit(); 1461 err_init_proc: 1462 cleanup_sctp_mibs(); 1463 err_init_mibs: 1464 kmem_cache_destroy(sctp_chunk_cachep); 1465 err_chunk_cachep: 1466 kmem_cache_destroy(sctp_bucket_cachep); 1467 goto out; 1468 } 1469 1470 /* Exit handler for the SCTP protocol. */ 1471 SCTP_STATIC __exit void sctp_exit(void) 1472 { 1473 /* BUG. This should probably do something useful like clean 1474 * up all the remaining associations and all that memory. 1475 */ 1476 1477 /* Unregister with inet6/inet layers. */ 1478 sctp_v6_del_protocol(); 1479 sctp_v4_del_protocol(); 1480 sctp_free_addr_wq(); 1481 1482 /* Free the control endpoint. */ 1483 inet_ctl_sock_destroy(sctp_ctl_sock); 1484 1485 /* Free protosw registrations */ 1486 sctp_v6_protosw_exit(); 1487 sctp_v4_protosw_exit(); 1488 1489 /* Free the local address list. */ 1490 sctp_free_local_addr_list(); 1491 1492 /* Unregister with socket layer. */ 1493 sctp_v6_pf_exit(); 1494 sctp_v4_pf_exit(); 1495 1496 sctp_sysctl_unregister(); 1497 1498 free_pages((unsigned long)sctp_assoc_hashtable, 1499 get_order(sctp_assoc_hashsize * 1500 sizeof(struct sctp_hashbucket))); 1501 kfree(sctp_ep_hashtable); 1502 free_pages((unsigned long)sctp_port_hashtable, 1503 get_order(sctp_port_hashsize * 1504 sizeof(struct sctp_bind_hashbucket))); 1505 1506 sctp_dbg_objcnt_exit(); 1507 sctp_proc_exit(); 1508 cleanup_sctp_mibs(); 1509 1510 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1511 1512 kmem_cache_destroy(sctp_chunk_cachep); 1513 kmem_cache_destroy(sctp_bucket_cachep); 1514 } 1515 1516 module_init(sctp_init); 1517 module_exit(sctp_exit); 1518 1519 /* 1520 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1521 */ 1522 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1523 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1524 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1525 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1526 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1527 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1528 MODULE_LICENSE("GPL"); 1529