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, see 27 * <http://www.gnu.org/licenses/>. 28 * 29 * Please send any bug reports or fixes you make to the 30 * email address(es): 31 * lksctp developers <linux-sctp@vger.kernel.org> 32 * 33 * Written or modified by: 34 * La Monte H.P. Yarroll <piggy@acm.org> 35 * Karl Knutson <karl@athena.chicago.il.us> 36 * Jon Grimm <jgrimm@us.ibm.com> 37 * Sridhar Samudrala <sri@us.ibm.com> 38 * Daisy Chang <daisyc@us.ibm.com> 39 * Ardelle Fan <ardelle.fan@intel.com> 40 */ 41 42 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 43 44 #include <linux/module.h> 45 #include <linux/init.h> 46 #include <linux/netdevice.h> 47 #include <linux/inetdevice.h> 48 #include <linux/seq_file.h> 49 #include <linux/bootmem.h> 50 #include <linux/highmem.h> 51 #include <linux/swap.h> 52 #include <linux/slab.h> 53 #include <net/net_namespace.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 66 struct idr sctp_assocs_id; 67 DEFINE_SPINLOCK(sctp_assocs_id_lock); 68 69 static struct sctp_pf *sctp_pf_inet6_specific; 70 static struct sctp_pf *sctp_pf_inet_specific; 71 static struct sctp_af *sctp_af_v4_specific; 72 static struct sctp_af *sctp_af_v6_specific; 73 74 struct kmem_cache *sctp_chunk_cachep __read_mostly; 75 struct kmem_cache *sctp_bucket_cachep __read_mostly; 76 77 long sysctl_sctp_mem[3]; 78 int sysctl_sctp_rmem[3]; 79 int sysctl_sctp_wmem[3]; 80 81 /* Set up the proc fs entry for the SCTP protocol. */ 82 static int __net_init sctp_proc_init(struct net *net) 83 { 84 #ifdef CONFIG_PROC_FS 85 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); 86 if (!net->sctp.proc_net_sctp) 87 goto out_proc_net_sctp; 88 if (sctp_snmp_proc_init(net)) 89 goto out_snmp_proc_init; 90 if (sctp_eps_proc_init(net)) 91 goto out_eps_proc_init; 92 if (sctp_assocs_proc_init(net)) 93 goto out_assocs_proc_init; 94 if (sctp_remaddr_proc_init(net)) 95 goto out_remaddr_proc_init; 96 97 return 0; 98 99 out_remaddr_proc_init: 100 sctp_assocs_proc_exit(net); 101 out_assocs_proc_init: 102 sctp_eps_proc_exit(net); 103 out_eps_proc_init: 104 sctp_snmp_proc_exit(net); 105 out_snmp_proc_init: 106 remove_proc_entry("sctp", net->proc_net); 107 net->sctp.proc_net_sctp = NULL; 108 out_proc_net_sctp: 109 return -ENOMEM; 110 #endif /* CONFIG_PROC_FS */ 111 return 0; 112 } 113 114 /* Clean up the proc fs entry for the SCTP protocol. 115 * Note: Do not make this __exit as it is used in the init error 116 * path. 117 */ 118 static void sctp_proc_exit(struct net *net) 119 { 120 #ifdef CONFIG_PROC_FS 121 sctp_snmp_proc_exit(net); 122 sctp_eps_proc_exit(net); 123 sctp_assocs_proc_exit(net); 124 sctp_remaddr_proc_exit(net); 125 126 remove_proc_entry("sctp", net->proc_net); 127 net->sctp.proc_net_sctp = NULL; 128 #endif 129 } 130 131 /* Private helper to extract ipv4 address and stash them in 132 * the protocol structure. 133 */ 134 static void sctp_v4_copy_addrlist(struct list_head *addrlist, 135 struct net_device *dev) 136 { 137 struct in_device *in_dev; 138 struct in_ifaddr *ifa; 139 struct sctp_sockaddr_entry *addr; 140 141 rcu_read_lock(); 142 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 143 rcu_read_unlock(); 144 return; 145 } 146 147 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 148 /* Add the address to the local list. */ 149 addr = kzalloc(sizeof(*addr), GFP_ATOMIC); 150 if (addr) { 151 addr->a.v4.sin_family = AF_INET; 152 addr->a.v4.sin_port = 0; 153 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 154 addr->valid = 1; 155 INIT_LIST_HEAD(&addr->list); 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(struct net *net) 167 { 168 struct net_device *dev; 169 struct list_head *pos; 170 struct sctp_af *af; 171 172 rcu_read_lock(); 173 for_each_netdev_rcu(net, dev) { 174 list_for_each(pos, &sctp_address_families) { 175 af = list_entry(pos, struct sctp_af, list); 176 af->copy_addrlist(&net->sctp.local_addr_list, dev); 177 } 178 } 179 rcu_read_unlock(); 180 } 181 182 /* Free the existing local addresses. */ 183 static void sctp_free_local_addr_list(struct net *net) 184 { 185 struct sctp_sockaddr_entry *addr; 186 struct list_head *pos, *temp; 187 188 list_for_each_safe(pos, temp, &net->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 net *net, struct sctp_bind_addr *bp, 197 sctp_scope_t scope, gfp_t gfp, int copy_flags) 198 { 199 struct sctp_sockaddr_entry *addr; 200 int error = 0; 201 202 rcu_read_lock(); 203 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) { 204 if (!addr->valid) 205 continue; 206 if (sctp_in_scope(net, &addr->a, scope)) { 207 /* Now that the address is in scope, check to see if 208 * the address type is really supported by the local 209 * sock as well as the remote peer. 210 */ 211 if ((((AF_INET == addr->a.sa.sa_family) && 212 (copy_flags & SCTP_ADDR4_PEERSUPP))) || 213 (((AF_INET6 == addr->a.sa.sa_family) && 214 (copy_flags & SCTP_ADDR6_ALLOWED) && 215 (copy_flags & SCTP_ADDR6_PEERSUPP)))) { 216 error = sctp_add_bind_addr(bp, &addr->a, 217 SCTP_ADDR_SRC, GFP_ATOMIC); 218 if (error) 219 goto end_copy; 220 } 221 } 222 } 223 224 end_copy: 225 rcu_read_unlock(); 226 return error; 227 } 228 229 /* Initialize a sctp_addr from in incoming skb. */ 230 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 231 int is_saddr) 232 { 233 void *from; 234 __be16 *port; 235 struct sctphdr *sh; 236 237 port = &addr->v4.sin_port; 238 addr->v4.sin_family = AF_INET; 239 240 sh = sctp_hdr(skb); 241 if (is_saddr) { 242 *port = sh->source; 243 from = &ip_hdr(skb)->saddr; 244 } else { 245 *port = sh->dest; 246 from = &ip_hdr(skb)->daddr; 247 } 248 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); 249 } 250 251 /* Initialize an sctp_addr from a socket. */ 252 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 253 { 254 addr->v4.sin_family = AF_INET; 255 addr->v4.sin_port = 0; 256 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; 257 } 258 259 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 260 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 261 { 262 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; 263 } 264 265 /* Initialize sk->sk_daddr from sctp_addr. */ 266 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 267 { 268 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; 269 } 270 271 /* Initialize a sctp_addr from an address parameter. */ 272 static void sctp_v4_from_addr_param(union sctp_addr *addr, 273 union sctp_addr_param *param, 274 __be16 port, int iif) 275 { 276 addr->v4.sin_family = AF_INET; 277 addr->v4.sin_port = port; 278 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 279 } 280 281 /* Initialize an address parameter from a sctp_addr and return the length 282 * of the address parameter. 283 */ 284 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 285 union sctp_addr_param *param) 286 { 287 int length = sizeof(sctp_ipv4addr_param_t); 288 289 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 290 param->v4.param_hdr.length = htons(length); 291 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 292 293 return length; 294 } 295 296 /* Initialize a sctp_addr from a dst_entry. */ 297 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4, 298 __be16 port) 299 { 300 saddr->v4.sin_family = AF_INET; 301 saddr->v4.sin_port = port; 302 saddr->v4.sin_addr.s_addr = fl4->saddr; 303 } 304 305 /* Compare two addresses exactly. */ 306 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 307 const union sctp_addr *addr2) 308 { 309 if (addr1->sa.sa_family != addr2->sa.sa_family) 310 return 0; 311 if (addr1->v4.sin_port != addr2->v4.sin_port) 312 return 0; 313 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 314 return 0; 315 316 return 1; 317 } 318 319 /* Initialize addr struct to INADDR_ANY. */ 320 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 321 { 322 addr->v4.sin_family = AF_INET; 323 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 324 addr->v4.sin_port = port; 325 } 326 327 /* Is this a wildcard address? */ 328 static int sctp_v4_is_any(const union sctp_addr *addr) 329 { 330 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 331 } 332 333 /* This function checks if the address is a valid address to be used for 334 * SCTP binding. 335 * 336 * Output: 337 * Return 0 - If the address is a non-unicast or an illegal address. 338 * Return 1 - If the address is a unicast. 339 */ 340 static int sctp_v4_addr_valid(union sctp_addr *addr, 341 struct sctp_sock *sp, 342 const struct sk_buff *skb) 343 { 344 /* IPv4 addresses not allowed */ 345 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 346 return 0; 347 348 /* Is this a non-unicast address or a unusable SCTP address? */ 349 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 350 return 0; 351 352 /* Is this a broadcast address? */ 353 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) 354 return 0; 355 356 return 1; 357 } 358 359 /* Should this be available for binding? */ 360 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 361 { 362 struct net *net = sock_net(&sp->inet.sk); 363 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr); 364 365 366 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 367 ret != RTN_LOCAL && 368 !sp->inet.freebind && 369 !sysctl_ip_nonlocal_bind) 370 return 0; 371 372 if (ipv6_only_sock(sctp_opt2sk(sp))) 373 return 0; 374 375 return 1; 376 } 377 378 /* Checking the loopback, private and other address scopes as defined in 379 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 380 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 381 * 382 * Level 0 - unusable SCTP addresses 383 * Level 1 - loopback address 384 * Level 2 - link-local addresses 385 * Level 3 - private addresses. 386 * Level 4 - global addresses 387 * For INIT and INIT-ACK address list, let L be the level of 388 * of requested destination address, sender and receiver 389 * SHOULD include all of its addresses with level greater 390 * than or equal to L. 391 * 392 * IPv4 scoping can be controlled through sysctl option 393 * net.sctp.addr_scope_policy 394 */ 395 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 396 { 397 sctp_scope_t retval; 398 399 /* Check for unusable SCTP addresses. */ 400 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 401 retval = SCTP_SCOPE_UNUSABLE; 402 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 403 retval = SCTP_SCOPE_LOOPBACK; 404 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 405 retval = SCTP_SCOPE_LINK; 406 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 407 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 408 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { 409 retval = SCTP_SCOPE_PRIVATE; 410 } else { 411 retval = SCTP_SCOPE_GLOBAL; 412 } 413 414 return retval; 415 } 416 417 /* Returns a valid dst cache entry for the given source and destination ip 418 * addresses. If an association is passed, trys to get a dst entry with a 419 * source address that matches an address in the bind address list. 420 */ 421 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr, 422 struct flowi *fl, struct sock *sk) 423 { 424 struct sctp_association *asoc = t->asoc; 425 struct rtable *rt; 426 struct flowi4 *fl4 = &fl->u.ip4; 427 struct sctp_bind_addr *bp; 428 struct sctp_sockaddr_entry *laddr; 429 struct dst_entry *dst = NULL; 430 union sctp_addr *daddr = &t->ipaddr; 431 union sctp_addr dst_saddr; 432 433 memset(fl4, 0x0, sizeof(struct flowi4)); 434 fl4->daddr = daddr->v4.sin_addr.s_addr; 435 fl4->fl4_dport = daddr->v4.sin_port; 436 fl4->flowi4_proto = IPPROTO_SCTP; 437 if (asoc) { 438 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk); 439 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if; 440 fl4->fl4_sport = htons(asoc->base.bind_addr.port); 441 } 442 if (saddr) { 443 fl4->saddr = saddr->v4.sin_addr.s_addr; 444 fl4->fl4_sport = saddr->v4.sin_port; 445 } 446 447 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr, 448 &fl4->saddr); 449 450 rt = ip_route_output_key(sock_net(sk), fl4); 451 if (!IS_ERR(rt)) 452 dst = &rt->dst; 453 454 /* If there is no association or if a source address is passed, no 455 * more validation is required. 456 */ 457 if (!asoc || saddr) 458 goto out; 459 460 bp = &asoc->base.bind_addr; 461 462 if (dst) { 463 /* Walk through the bind address list and look for a bind 464 * address that matches the source address of the returned dst. 465 */ 466 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port)); 467 rcu_read_lock(); 468 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 469 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) || 470 (laddr->state != SCTP_ADDR_SRC && 471 !asoc->src_out_of_asoc_ok)) 472 continue; 473 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 474 goto out_unlock; 475 } 476 rcu_read_unlock(); 477 478 /* None of the bound addresses match the source address of the 479 * dst. So release it. 480 */ 481 dst_release(dst); 482 dst = NULL; 483 } 484 485 /* Walk through the bind address list and try to get a dst that 486 * matches a bind address as the source address. 487 */ 488 rcu_read_lock(); 489 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 490 if (!laddr->valid) 491 continue; 492 if ((laddr->state == SCTP_ADDR_SRC) && 493 (AF_INET == laddr->a.sa.sa_family)) { 494 fl4->saddr = laddr->a.v4.sin_addr.s_addr; 495 fl4->fl4_sport = laddr->a.v4.sin_port; 496 rt = ip_route_output_key(sock_net(sk), fl4); 497 if (!IS_ERR(rt)) { 498 dst = &rt->dst; 499 goto out_unlock; 500 } 501 } 502 } 503 504 out_unlock: 505 rcu_read_unlock(); 506 out: 507 t->dst = dst; 508 if (dst) 509 pr_debug("rt_dst:%pI4, rt_src:%pI4\n", 510 &fl4->daddr, &fl4->saddr); 511 else 512 pr_debug("no route\n"); 513 } 514 515 /* For v4, the source address is cached in the route entry(dst). So no need 516 * to cache it separately and hence this is an empty routine. 517 */ 518 static void sctp_v4_get_saddr(struct sctp_sock *sk, 519 struct sctp_transport *t, 520 struct flowi *fl) 521 { 522 union sctp_addr *saddr = &t->saddr; 523 struct rtable *rt = (struct rtable *)t->dst; 524 525 if (rt) { 526 saddr->v4.sin_family = AF_INET; 527 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; 528 } 529 } 530 531 /* What interface did this skb arrive on? */ 532 static int sctp_v4_skb_iif(const struct sk_buff *skb) 533 { 534 return inet_iif(skb); 535 } 536 537 /* Was this packet marked by Explicit Congestion Notification? */ 538 static int sctp_v4_is_ce(const struct sk_buff *skb) 539 { 540 return INET_ECN_is_ce(ip_hdr(skb)->tos); 541 } 542 543 /* Create and initialize a new sk for the socket returned by accept(). */ 544 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 545 struct sctp_association *asoc) 546 { 547 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 548 sk->sk_prot); 549 struct inet_sock *newinet; 550 551 if (!newsk) 552 goto out; 553 554 sock_init_data(NULL, newsk); 555 556 sctp_copy_sock(newsk, sk, asoc); 557 sock_reset_flag(newsk, SOCK_ZAPPED); 558 559 newinet = inet_sk(newsk); 560 561 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 562 563 sk_refcnt_debug_inc(newsk); 564 565 if (newsk->sk_prot->init(newsk)) { 566 sk_common_release(newsk); 567 newsk = NULL; 568 } 569 570 out: 571 return newsk; 572 } 573 574 /* Map address, empty for v4 family */ 575 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 576 { 577 /* Empty */ 578 } 579 580 /* Dump the v4 addr to the seq file. */ 581 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 582 { 583 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 584 } 585 586 static void sctp_v4_ecn_capable(struct sock *sk) 587 { 588 INET_ECN_xmit(sk); 589 } 590 591 static void sctp_addr_wq_timeout_handler(unsigned long arg) 592 { 593 struct net *net = (struct net *)arg; 594 struct sctp_sockaddr_entry *addrw, *temp; 595 struct sctp_sock *sp; 596 597 spin_lock_bh(&net->sctp.addr_wq_lock); 598 599 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { 600 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at " 601 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa, 602 addrw->state, addrw); 603 604 #if IS_ENABLED(CONFIG_IPV6) 605 /* Now we send an ASCONF for each association */ 606 /* Note. we currently don't handle link local IPv6 addressees */ 607 if (addrw->a.sa.sa_family == AF_INET6) { 608 struct in6_addr *in6; 609 610 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) & 611 IPV6_ADDR_LINKLOCAL) 612 goto free_next; 613 614 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr; 615 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 && 616 addrw->state == SCTP_ADDR_NEW) { 617 unsigned long timeo_val; 618 619 pr_debug("%s: this is on DAD, trying %d sec " 620 "later\n", __func__, 621 SCTP_ADDRESS_TICK_DELAY); 622 623 timeo_val = jiffies; 624 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 625 mod_timer(&net->sctp.addr_wq_timer, timeo_val); 626 break; 627 } 628 } 629 #endif 630 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) { 631 struct sock *sk; 632 633 sk = sctp_opt2sk(sp); 634 /* ignore bound-specific endpoints */ 635 if (!sctp_is_ep_boundall(sk)) 636 continue; 637 bh_lock_sock(sk); 638 if (sctp_asconf_mgmt(sp, addrw) < 0) 639 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__); 640 bh_unlock_sock(sk); 641 } 642 #if IS_ENABLED(CONFIG_IPV6) 643 free_next: 644 #endif 645 list_del(&addrw->list); 646 kfree(addrw); 647 } 648 spin_unlock_bh(&net->sctp.addr_wq_lock); 649 } 650 651 static void sctp_free_addr_wq(struct net *net) 652 { 653 struct sctp_sockaddr_entry *addrw; 654 struct sctp_sockaddr_entry *temp; 655 656 spin_lock_bh(&net->sctp.addr_wq_lock); 657 del_timer(&net->sctp.addr_wq_timer); 658 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { 659 list_del(&addrw->list); 660 kfree(addrw); 661 } 662 spin_unlock_bh(&net->sctp.addr_wq_lock); 663 } 664 665 /* lookup the entry for the same address in the addr_waitq 666 * sctp_addr_wq MUST be locked 667 */ 668 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net, 669 struct sctp_sockaddr_entry *addr) 670 { 671 struct sctp_sockaddr_entry *addrw; 672 673 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) { 674 if (addrw->a.sa.sa_family != addr->a.sa.sa_family) 675 continue; 676 if (addrw->a.sa.sa_family == AF_INET) { 677 if (addrw->a.v4.sin_addr.s_addr == 678 addr->a.v4.sin_addr.s_addr) 679 return addrw; 680 } else if (addrw->a.sa.sa_family == AF_INET6) { 681 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr, 682 &addr->a.v6.sin6_addr)) 683 return addrw; 684 } 685 } 686 return NULL; 687 } 688 689 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd) 690 { 691 struct sctp_sockaddr_entry *addrw; 692 unsigned long timeo_val; 693 694 /* first, we check if an opposite message already exist in the queue. 695 * If we found such message, it is removed. 696 * This operation is a bit stupid, but the DHCP client attaches the 697 * new address after a couple of addition and deletion of that address 698 */ 699 700 spin_lock_bh(&net->sctp.addr_wq_lock); 701 /* Offsets existing events in addr_wq */ 702 addrw = sctp_addr_wq_lookup(net, addr); 703 if (addrw) { 704 if (addrw->state != cmd) { 705 pr_debug("%s: offsets existing entry for %d, addr:%pISc " 706 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa, 707 &net->sctp.addr_waitq); 708 709 list_del(&addrw->list); 710 kfree(addrw); 711 } 712 spin_unlock_bh(&net->sctp.addr_wq_lock); 713 return; 714 } 715 716 /* OK, we have to add the new address to the wait queue */ 717 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 718 if (addrw == NULL) { 719 spin_unlock_bh(&net->sctp.addr_wq_lock); 720 return; 721 } 722 addrw->state = cmd; 723 list_add_tail(&addrw->list, &net->sctp.addr_waitq); 724 725 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n", 726 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq); 727 728 if (!timer_pending(&net->sctp.addr_wq_timer)) { 729 timeo_val = jiffies; 730 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 731 mod_timer(&net->sctp.addr_wq_timer, timeo_val); 732 } 733 spin_unlock_bh(&net->sctp.addr_wq_lock); 734 } 735 736 /* Event handler for inet address addition/deletion events. 737 * The sctp_local_addr_list needs to be protocted by a spin lock since 738 * multiple notifiers (say IPv4 and IPv6) may be running at the same 739 * time and thus corrupt the list. 740 * The reader side is protected with RCU. 741 */ 742 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 743 void *ptr) 744 { 745 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 746 struct sctp_sockaddr_entry *addr = NULL; 747 struct sctp_sockaddr_entry *temp; 748 struct net *net = dev_net(ifa->ifa_dev->dev); 749 int found = 0; 750 751 switch (ev) { 752 case NETDEV_UP: 753 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 754 if (addr) { 755 addr->a.v4.sin_family = AF_INET; 756 addr->a.v4.sin_port = 0; 757 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 758 addr->valid = 1; 759 spin_lock_bh(&net->sctp.local_addr_lock); 760 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); 761 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); 762 spin_unlock_bh(&net->sctp.local_addr_lock); 763 } 764 break; 765 case NETDEV_DOWN: 766 spin_lock_bh(&net->sctp.local_addr_lock); 767 list_for_each_entry_safe(addr, temp, 768 &net->sctp.local_addr_list, list) { 769 if (addr->a.sa.sa_family == AF_INET && 770 addr->a.v4.sin_addr.s_addr == 771 ifa->ifa_local) { 772 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); 773 found = 1; 774 addr->valid = 0; 775 list_del_rcu(&addr->list); 776 break; 777 } 778 } 779 spin_unlock_bh(&net->sctp.local_addr_lock); 780 if (found) 781 kfree_rcu(addr, rcu); 782 break; 783 } 784 785 return NOTIFY_DONE; 786 } 787 788 /* 789 * Initialize the control inode/socket with a control endpoint data 790 * structure. This endpoint is reserved exclusively for the OOTB processing. 791 */ 792 static int sctp_ctl_sock_init(struct net *net) 793 { 794 int err; 795 sa_family_t family = PF_INET; 796 797 if (sctp_get_pf_specific(PF_INET6)) 798 family = PF_INET6; 799 800 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family, 801 SOCK_SEQPACKET, IPPROTO_SCTP, net); 802 803 /* If IPv6 socket could not be created, try the IPv4 socket */ 804 if (err < 0 && family == PF_INET6) 805 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET, 806 SOCK_SEQPACKET, IPPROTO_SCTP, 807 net); 808 809 if (err < 0) { 810 pr_err("Failed to create the SCTP control socket\n"); 811 return err; 812 } 813 return 0; 814 } 815 816 /* Register address family specific functions. */ 817 int sctp_register_af(struct sctp_af *af) 818 { 819 switch (af->sa_family) { 820 case AF_INET: 821 if (sctp_af_v4_specific) 822 return 0; 823 sctp_af_v4_specific = af; 824 break; 825 case AF_INET6: 826 if (sctp_af_v6_specific) 827 return 0; 828 sctp_af_v6_specific = af; 829 break; 830 default: 831 return 0; 832 } 833 834 INIT_LIST_HEAD(&af->list); 835 list_add_tail(&af->list, &sctp_address_families); 836 return 1; 837 } 838 839 /* Get the table of functions for manipulating a particular address 840 * family. 841 */ 842 struct sctp_af *sctp_get_af_specific(sa_family_t family) 843 { 844 switch (family) { 845 case AF_INET: 846 return sctp_af_v4_specific; 847 case AF_INET6: 848 return sctp_af_v6_specific; 849 default: 850 return NULL; 851 } 852 } 853 854 /* Common code to initialize a AF_INET msg_name. */ 855 static void sctp_inet_msgname(char *msgname, int *addr_len) 856 { 857 struct sockaddr_in *sin; 858 859 sin = (struct sockaddr_in *)msgname; 860 *addr_len = sizeof(struct sockaddr_in); 861 sin->sin_family = AF_INET; 862 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 863 } 864 865 /* Copy the primary address of the peer primary address as the msg_name. */ 866 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 867 int *addr_len) 868 { 869 struct sockaddr_in *sin, *sinfrom; 870 871 if (msgname) { 872 struct sctp_association *asoc; 873 874 asoc = event->asoc; 875 sctp_inet_msgname(msgname, addr_len); 876 sin = (struct sockaddr_in *)msgname; 877 sinfrom = &asoc->peer.primary_addr.v4; 878 sin->sin_port = htons(asoc->peer.port); 879 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 880 } 881 } 882 883 /* Initialize and copy out a msgname from an inbound skb. */ 884 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 885 { 886 if (msgname) { 887 struct sctphdr *sh = sctp_hdr(skb); 888 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 889 890 sctp_inet_msgname(msgname, len); 891 sin->sin_port = sh->source; 892 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 893 } 894 } 895 896 /* Do we support this AF? */ 897 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 898 { 899 /* PF_INET only supports AF_INET addresses. */ 900 return AF_INET == family; 901 } 902 903 /* Address matching with wildcards allowed. */ 904 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 905 const union sctp_addr *addr2, 906 struct sctp_sock *opt) 907 { 908 /* PF_INET only supports AF_INET addresses. */ 909 if (addr1->sa.sa_family != addr2->sa.sa_family) 910 return 0; 911 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 912 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 913 return 1; 914 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 915 return 1; 916 917 return 0; 918 } 919 920 /* Verify that provided sockaddr looks bindable. Common verification has 921 * already been taken care of. 922 */ 923 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 924 { 925 return sctp_v4_available(addr, opt); 926 } 927 928 /* Verify that sockaddr looks sendable. Common verification has already 929 * been taken care of. 930 */ 931 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 932 { 933 return 1; 934 } 935 936 /* Fill in Supported Address Type information for INIT and INIT-ACK 937 * chunks. Returns number of addresses supported. 938 */ 939 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 940 __be16 *types) 941 { 942 types[0] = SCTP_PARAM_IPV4_ADDRESS; 943 return 1; 944 } 945 946 /* Wrapper routine that calls the ip transmit routine. */ 947 static inline int sctp_v4_xmit(struct sk_buff *skb, 948 struct sctp_transport *transport) 949 { 950 struct inet_sock *inet = inet_sk(skb->sk); 951 952 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb, 953 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr); 954 955 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 956 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 957 958 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS); 959 960 return ip_queue_xmit(skb, &transport->fl); 961 } 962 963 static struct sctp_af sctp_af_inet; 964 965 static struct sctp_pf sctp_pf_inet = { 966 .event_msgname = sctp_inet_event_msgname, 967 .skb_msgname = sctp_inet_skb_msgname, 968 .af_supported = sctp_inet_af_supported, 969 .cmp_addr = sctp_inet_cmp_addr, 970 .bind_verify = sctp_inet_bind_verify, 971 .send_verify = sctp_inet_send_verify, 972 .supported_addrs = sctp_inet_supported_addrs, 973 .create_accept_sk = sctp_v4_create_accept_sk, 974 .addr_v4map = sctp_v4_addr_v4map, 975 .af = &sctp_af_inet 976 }; 977 978 /* Notifier for inetaddr addition/deletion events. */ 979 static struct notifier_block sctp_inetaddr_notifier = { 980 .notifier_call = sctp_inetaddr_event, 981 }; 982 983 /* Socket operations. */ 984 static const struct proto_ops inet_seqpacket_ops = { 985 .family = PF_INET, 986 .owner = THIS_MODULE, 987 .release = inet_release, /* Needs to be wrapped... */ 988 .bind = inet_bind, 989 .connect = inet_dgram_connect, 990 .socketpair = sock_no_socketpair, 991 .accept = inet_accept, 992 .getname = inet_getname, /* Semantics are different. */ 993 .poll = sctp_poll, 994 .ioctl = inet_ioctl, 995 .listen = sctp_inet_listen, 996 .shutdown = inet_shutdown, /* Looks harmless. */ 997 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 998 .getsockopt = sock_common_getsockopt, 999 .sendmsg = inet_sendmsg, 1000 .recvmsg = sock_common_recvmsg, 1001 .mmap = sock_no_mmap, 1002 .sendpage = sock_no_sendpage, 1003 #ifdef CONFIG_COMPAT 1004 .compat_setsockopt = compat_sock_common_setsockopt, 1005 .compat_getsockopt = compat_sock_common_getsockopt, 1006 #endif 1007 }; 1008 1009 /* Registration with AF_INET family. */ 1010 static struct inet_protosw sctp_seqpacket_protosw = { 1011 .type = SOCK_SEQPACKET, 1012 .protocol = IPPROTO_SCTP, 1013 .prot = &sctp_prot, 1014 .ops = &inet_seqpacket_ops, 1015 .no_check = 0, 1016 .flags = SCTP_PROTOSW_FLAG 1017 }; 1018 static struct inet_protosw sctp_stream_protosw = { 1019 .type = SOCK_STREAM, 1020 .protocol = IPPROTO_SCTP, 1021 .prot = &sctp_prot, 1022 .ops = &inet_seqpacket_ops, 1023 .no_check = 0, 1024 .flags = SCTP_PROTOSW_FLAG 1025 }; 1026 1027 /* Register with IP layer. */ 1028 static const struct net_protocol sctp_protocol = { 1029 .handler = sctp_rcv, 1030 .err_handler = sctp_v4_err, 1031 .no_policy = 1, 1032 .netns_ok = 1, 1033 .icmp_strict_tag_validation = 1, 1034 }; 1035 1036 /* IPv4 address related functions. */ 1037 static struct sctp_af sctp_af_inet = { 1038 .sa_family = AF_INET, 1039 .sctp_xmit = sctp_v4_xmit, 1040 .setsockopt = ip_setsockopt, 1041 .getsockopt = ip_getsockopt, 1042 .get_dst = sctp_v4_get_dst, 1043 .get_saddr = sctp_v4_get_saddr, 1044 .copy_addrlist = sctp_v4_copy_addrlist, 1045 .from_skb = sctp_v4_from_skb, 1046 .from_sk = sctp_v4_from_sk, 1047 .to_sk_saddr = sctp_v4_to_sk_saddr, 1048 .to_sk_daddr = sctp_v4_to_sk_daddr, 1049 .from_addr_param = sctp_v4_from_addr_param, 1050 .to_addr_param = sctp_v4_to_addr_param, 1051 .cmp_addr = sctp_v4_cmp_addr, 1052 .addr_valid = sctp_v4_addr_valid, 1053 .inaddr_any = sctp_v4_inaddr_any, 1054 .is_any = sctp_v4_is_any, 1055 .available = sctp_v4_available, 1056 .scope = sctp_v4_scope, 1057 .skb_iif = sctp_v4_skb_iif, 1058 .is_ce = sctp_v4_is_ce, 1059 .seq_dump_addr = sctp_v4_seq_dump_addr, 1060 .ecn_capable = sctp_v4_ecn_capable, 1061 .net_header_len = sizeof(struct iphdr), 1062 .sockaddr_len = sizeof(struct sockaddr_in), 1063 #ifdef CONFIG_COMPAT 1064 .compat_setsockopt = compat_ip_setsockopt, 1065 .compat_getsockopt = compat_ip_getsockopt, 1066 #endif 1067 }; 1068 1069 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) 1070 { 1071 switch (family) { 1072 case PF_INET: 1073 return sctp_pf_inet_specific; 1074 case PF_INET6: 1075 return sctp_pf_inet6_specific; 1076 default: 1077 return NULL; 1078 } 1079 } 1080 1081 /* Register the PF specific function table. */ 1082 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 1083 { 1084 switch (family) { 1085 case PF_INET: 1086 if (sctp_pf_inet_specific) 1087 return 0; 1088 sctp_pf_inet_specific = pf; 1089 break; 1090 case PF_INET6: 1091 if (sctp_pf_inet6_specific) 1092 return 0; 1093 sctp_pf_inet6_specific = pf; 1094 break; 1095 default: 1096 return 0; 1097 } 1098 return 1; 1099 } 1100 1101 static inline int init_sctp_mibs(struct net *net) 1102 { 1103 return snmp_mib_init((void __percpu **)net->sctp.sctp_statistics, 1104 sizeof(struct sctp_mib), 1105 __alignof__(struct sctp_mib)); 1106 } 1107 1108 static inline void cleanup_sctp_mibs(struct net *net) 1109 { 1110 snmp_mib_free((void __percpu **)net->sctp.sctp_statistics); 1111 } 1112 1113 static void sctp_v4_pf_init(void) 1114 { 1115 /* Initialize the SCTP specific PF functions. */ 1116 sctp_register_pf(&sctp_pf_inet, PF_INET); 1117 sctp_register_af(&sctp_af_inet); 1118 } 1119 1120 static void sctp_v4_pf_exit(void) 1121 { 1122 list_del(&sctp_af_inet.list); 1123 } 1124 1125 static int sctp_v4_protosw_init(void) 1126 { 1127 int rc; 1128 1129 rc = proto_register(&sctp_prot, 1); 1130 if (rc) 1131 return rc; 1132 1133 /* Register SCTP(UDP and TCP style) with socket layer. */ 1134 inet_register_protosw(&sctp_seqpacket_protosw); 1135 inet_register_protosw(&sctp_stream_protosw); 1136 1137 return 0; 1138 } 1139 1140 static void sctp_v4_protosw_exit(void) 1141 { 1142 inet_unregister_protosw(&sctp_stream_protosw); 1143 inet_unregister_protosw(&sctp_seqpacket_protosw); 1144 proto_unregister(&sctp_prot); 1145 } 1146 1147 static int sctp_v4_add_protocol(void) 1148 { 1149 /* Register notifier for inet address additions/deletions. */ 1150 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1151 1152 /* Register SCTP with inet layer. */ 1153 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1154 return -EAGAIN; 1155 1156 return 0; 1157 } 1158 1159 static void sctp_v4_del_protocol(void) 1160 { 1161 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1162 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1163 } 1164 1165 static int __net_init sctp_net_init(struct net *net) 1166 { 1167 int status; 1168 1169 /* 1170 * 14. Suggested SCTP Protocol Parameter Values 1171 */ 1172 /* The following protocol parameters are RECOMMENDED: */ 1173 /* RTO.Initial - 3 seconds */ 1174 net->sctp.rto_initial = SCTP_RTO_INITIAL; 1175 /* RTO.Min - 1 second */ 1176 net->sctp.rto_min = SCTP_RTO_MIN; 1177 /* RTO.Max - 60 seconds */ 1178 net->sctp.rto_max = SCTP_RTO_MAX; 1179 /* RTO.Alpha - 1/8 */ 1180 net->sctp.rto_alpha = SCTP_RTO_ALPHA; 1181 /* RTO.Beta - 1/4 */ 1182 net->sctp.rto_beta = SCTP_RTO_BETA; 1183 1184 /* Valid.Cookie.Life - 60 seconds */ 1185 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1186 1187 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1188 net->sctp.cookie_preserve_enable = 1; 1189 1190 /* Default sctp sockets to use md5 as their hmac alg */ 1191 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5) 1192 net->sctp.sctp_hmac_alg = "md5"; 1193 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1) 1194 net->sctp.sctp_hmac_alg = "sha1"; 1195 #else 1196 net->sctp.sctp_hmac_alg = NULL; 1197 #endif 1198 1199 /* Max.Burst - 4 */ 1200 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST; 1201 1202 /* Association.Max.Retrans - 10 attempts 1203 * Path.Max.Retrans - 5 attempts (per destination address) 1204 * Max.Init.Retransmits - 8 attempts 1205 */ 1206 net->sctp.max_retrans_association = 10; 1207 net->sctp.max_retrans_path = 5; 1208 net->sctp.max_retrans_init = 8; 1209 1210 /* Sendbuffer growth - do per-socket accounting */ 1211 net->sctp.sndbuf_policy = 0; 1212 1213 /* Rcvbuffer growth - do per-socket accounting */ 1214 net->sctp.rcvbuf_policy = 0; 1215 1216 /* HB.interval - 30 seconds */ 1217 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1218 1219 /* delayed SACK timeout */ 1220 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1221 1222 /* Disable ADDIP by default. */ 1223 net->sctp.addip_enable = 0; 1224 net->sctp.addip_noauth = 0; 1225 net->sctp.default_auto_asconf = 0; 1226 1227 /* Enable PR-SCTP by default. */ 1228 net->sctp.prsctp_enable = 1; 1229 1230 /* Disable AUTH by default. */ 1231 net->sctp.auth_enable = 0; 1232 1233 /* Set SCOPE policy to enabled */ 1234 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE; 1235 1236 /* Set the default rwnd update threshold */ 1237 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; 1238 1239 /* Initialize maximum autoclose timeout. */ 1240 net->sctp.max_autoclose = INT_MAX / HZ; 1241 1242 status = sctp_sysctl_net_register(net); 1243 if (status) 1244 goto err_sysctl_register; 1245 1246 /* Allocate and initialise sctp mibs. */ 1247 status = init_sctp_mibs(net); 1248 if (status) 1249 goto err_init_mibs; 1250 1251 /* Initialize proc fs directory. */ 1252 status = sctp_proc_init(net); 1253 if (status) 1254 goto err_init_proc; 1255 1256 sctp_dbg_objcnt_init(net); 1257 1258 /* Initialize the control inode/socket for handling OOTB packets. */ 1259 if ((status = sctp_ctl_sock_init(net))) { 1260 pr_err("Failed to initialize the SCTP control sock\n"); 1261 goto err_ctl_sock_init; 1262 } 1263 1264 /* Initialize the local address list. */ 1265 INIT_LIST_HEAD(&net->sctp.local_addr_list); 1266 spin_lock_init(&net->sctp.local_addr_lock); 1267 sctp_get_local_addr_list(net); 1268 1269 /* Initialize the address event list */ 1270 INIT_LIST_HEAD(&net->sctp.addr_waitq); 1271 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist); 1272 spin_lock_init(&net->sctp.addr_wq_lock); 1273 net->sctp.addr_wq_timer.expires = 0; 1274 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 1275 (unsigned long)net); 1276 1277 return 0; 1278 1279 err_ctl_sock_init: 1280 sctp_dbg_objcnt_exit(net); 1281 sctp_proc_exit(net); 1282 err_init_proc: 1283 cleanup_sctp_mibs(net); 1284 err_init_mibs: 1285 sctp_sysctl_net_unregister(net); 1286 err_sysctl_register: 1287 return status; 1288 } 1289 1290 static void __net_exit sctp_net_exit(struct net *net) 1291 { 1292 /* Free the local address list */ 1293 sctp_free_addr_wq(net); 1294 sctp_free_local_addr_list(net); 1295 1296 /* Free the control endpoint. */ 1297 inet_ctl_sock_destroy(net->sctp.ctl_sock); 1298 1299 sctp_dbg_objcnt_exit(net); 1300 1301 sctp_proc_exit(net); 1302 cleanup_sctp_mibs(net); 1303 sctp_sysctl_net_unregister(net); 1304 } 1305 1306 static struct pernet_operations sctp_net_ops = { 1307 .init = sctp_net_init, 1308 .exit = sctp_net_exit, 1309 }; 1310 1311 /* Initialize the universe into something sensible. */ 1312 static __init int sctp_init(void) 1313 { 1314 int i; 1315 int status = -EINVAL; 1316 unsigned long goal; 1317 unsigned long limit; 1318 int max_share; 1319 int order; 1320 1321 BUILD_BUG_ON(sizeof(struct sctp_ulpevent) > 1322 sizeof(((struct sk_buff *) 0)->cb)); 1323 1324 /* Allocate bind_bucket and chunk caches. */ 1325 status = -ENOBUFS; 1326 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1327 sizeof(struct sctp_bind_bucket), 1328 0, SLAB_HWCACHE_ALIGN, 1329 NULL); 1330 if (!sctp_bucket_cachep) 1331 goto out; 1332 1333 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1334 sizeof(struct sctp_chunk), 1335 0, SLAB_HWCACHE_ALIGN, 1336 NULL); 1337 if (!sctp_chunk_cachep) 1338 goto err_chunk_cachep; 1339 1340 status = percpu_counter_init(&sctp_sockets_allocated, 0); 1341 if (status) 1342 goto err_percpu_counter_init; 1343 1344 /* Implementation specific variables. */ 1345 1346 /* Initialize default stream count setup information. */ 1347 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1348 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1349 1350 /* Initialize handle used for association ids. */ 1351 idr_init(&sctp_assocs_id); 1352 1353 limit = nr_free_buffer_pages() / 8; 1354 limit = max(limit, 128UL); 1355 sysctl_sctp_mem[0] = limit / 4 * 3; 1356 sysctl_sctp_mem[1] = limit; 1357 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1358 1359 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1360 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1361 max_share = min(4UL*1024*1024, limit); 1362 1363 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1364 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1); 1365 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1366 1367 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1368 sysctl_sctp_wmem[1] = 16*1024; 1369 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1370 1371 /* Size and allocate the association hash table. 1372 * The methodology is similar to that of the tcp hash tables. 1373 */ 1374 if (totalram_pages >= (128 * 1024)) 1375 goal = totalram_pages >> (22 - PAGE_SHIFT); 1376 else 1377 goal = totalram_pages >> (24 - PAGE_SHIFT); 1378 1379 for (order = 0; (1UL << order) < goal; order++) 1380 ; 1381 1382 do { 1383 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1384 sizeof(struct sctp_hashbucket); 1385 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1386 continue; 1387 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1388 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); 1389 } while (!sctp_assoc_hashtable && --order > 0); 1390 if (!sctp_assoc_hashtable) { 1391 pr_err("Failed association hash alloc\n"); 1392 status = -ENOMEM; 1393 goto err_ahash_alloc; 1394 } 1395 for (i = 0; i < sctp_assoc_hashsize; i++) { 1396 rwlock_init(&sctp_assoc_hashtable[i].lock); 1397 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1398 } 1399 1400 /* Allocate and initialize the endpoint hash table. */ 1401 sctp_ep_hashsize = 64; 1402 sctp_ep_hashtable = 1403 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1404 if (!sctp_ep_hashtable) { 1405 pr_err("Failed endpoint_hash alloc\n"); 1406 status = -ENOMEM; 1407 goto err_ehash_alloc; 1408 } 1409 for (i = 0; i < sctp_ep_hashsize; i++) { 1410 rwlock_init(&sctp_ep_hashtable[i].lock); 1411 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1412 } 1413 1414 /* Allocate and initialize the SCTP port hash table. */ 1415 do { 1416 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1417 sizeof(struct sctp_bind_hashbucket); 1418 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1419 continue; 1420 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1421 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); 1422 } while (!sctp_port_hashtable && --order > 0); 1423 if (!sctp_port_hashtable) { 1424 pr_err("Failed bind hash alloc\n"); 1425 status = -ENOMEM; 1426 goto err_bhash_alloc; 1427 } 1428 for (i = 0; i < sctp_port_hashsize; i++) { 1429 spin_lock_init(&sctp_port_hashtable[i].lock); 1430 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1431 } 1432 1433 pr_info("Hash tables configured (established %d bind %d)\n", 1434 sctp_assoc_hashsize, sctp_port_hashsize); 1435 1436 sctp_sysctl_register(); 1437 1438 INIT_LIST_HEAD(&sctp_address_families); 1439 sctp_v4_pf_init(); 1440 sctp_v6_pf_init(); 1441 1442 status = sctp_v4_protosw_init(); 1443 1444 if (status) 1445 goto err_protosw_init; 1446 1447 status = sctp_v6_protosw_init(); 1448 if (status) 1449 goto err_v6_protosw_init; 1450 1451 status = register_pernet_subsys(&sctp_net_ops); 1452 if (status) 1453 goto err_register_pernet_subsys; 1454 1455 status = sctp_v4_add_protocol(); 1456 if (status) 1457 goto err_add_protocol; 1458 1459 /* Register SCTP with inet6 layer. */ 1460 status = sctp_v6_add_protocol(); 1461 if (status) 1462 goto err_v6_add_protocol; 1463 1464 out: 1465 return status; 1466 err_v6_add_protocol: 1467 sctp_v4_del_protocol(); 1468 err_add_protocol: 1469 unregister_pernet_subsys(&sctp_net_ops); 1470 err_register_pernet_subsys: 1471 sctp_v6_protosw_exit(); 1472 err_v6_protosw_init: 1473 sctp_v4_protosw_exit(); 1474 err_protosw_init: 1475 sctp_v4_pf_exit(); 1476 sctp_v6_pf_exit(); 1477 sctp_sysctl_unregister(); 1478 free_pages((unsigned long)sctp_port_hashtable, 1479 get_order(sctp_port_hashsize * 1480 sizeof(struct sctp_bind_hashbucket))); 1481 err_bhash_alloc: 1482 kfree(sctp_ep_hashtable); 1483 err_ehash_alloc: 1484 free_pages((unsigned long)sctp_assoc_hashtable, 1485 get_order(sctp_assoc_hashsize * 1486 sizeof(struct sctp_hashbucket))); 1487 err_ahash_alloc: 1488 percpu_counter_destroy(&sctp_sockets_allocated); 1489 err_percpu_counter_init: 1490 kmem_cache_destroy(sctp_chunk_cachep); 1491 err_chunk_cachep: 1492 kmem_cache_destroy(sctp_bucket_cachep); 1493 goto out; 1494 } 1495 1496 /* Exit handler for the SCTP protocol. */ 1497 static __exit void sctp_exit(void) 1498 { 1499 /* BUG. This should probably do something useful like clean 1500 * up all the remaining associations and all that memory. 1501 */ 1502 1503 /* Unregister with inet6/inet layers. */ 1504 sctp_v6_del_protocol(); 1505 sctp_v4_del_protocol(); 1506 1507 unregister_pernet_subsys(&sctp_net_ops); 1508 1509 /* Free protosw registrations */ 1510 sctp_v6_protosw_exit(); 1511 sctp_v4_protosw_exit(); 1512 1513 /* Unregister with socket layer. */ 1514 sctp_v6_pf_exit(); 1515 sctp_v4_pf_exit(); 1516 1517 sctp_sysctl_unregister(); 1518 1519 free_pages((unsigned long)sctp_assoc_hashtable, 1520 get_order(sctp_assoc_hashsize * 1521 sizeof(struct sctp_hashbucket))); 1522 kfree(sctp_ep_hashtable); 1523 free_pages((unsigned long)sctp_port_hashtable, 1524 get_order(sctp_port_hashsize * 1525 sizeof(struct sctp_bind_hashbucket))); 1526 1527 percpu_counter_destroy(&sctp_sockets_allocated); 1528 1529 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1530 1531 kmem_cache_destroy(sctp_chunk_cachep); 1532 kmem_cache_destroy(sctp_bucket_cachep); 1533 } 1534 1535 module_init(sctp_init); 1536 module_exit(sctp_exit); 1537 1538 /* 1539 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1540 */ 1541 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1542 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1543 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>"); 1544 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1545 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1546 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1547 MODULE_LICENSE("GPL"); 1548