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 !net->ipv4.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 struct net_device *odev; 491 492 if (!laddr->valid) 493 continue; 494 if (laddr->state != SCTP_ADDR_SRC || 495 AF_INET != laddr->a.sa.sa_family) 496 continue; 497 498 fl4->fl4_sport = laddr->a.v4.sin_port; 499 flowi4_update_output(fl4, 500 asoc->base.sk->sk_bound_dev_if, 501 RT_CONN_FLAGS(asoc->base.sk), 502 daddr->v4.sin_addr.s_addr, 503 laddr->a.v4.sin_addr.s_addr); 504 505 rt = ip_route_output_key(sock_net(sk), fl4); 506 if (IS_ERR(rt)) 507 continue; 508 509 if (!dst) 510 dst = &rt->dst; 511 512 /* Ensure the src address belongs to the output 513 * interface. 514 */ 515 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr, 516 false); 517 if (!odev || odev->ifindex != fl4->flowi4_oif) { 518 if (&rt->dst != dst) 519 dst_release(&rt->dst); 520 continue; 521 } 522 523 if (dst != &rt->dst) 524 dst_release(dst); 525 dst = &rt->dst; 526 break; 527 } 528 529 out_unlock: 530 rcu_read_unlock(); 531 out: 532 t->dst = dst; 533 if (dst) 534 pr_debug("rt_dst:%pI4, rt_src:%pI4\n", 535 &fl4->daddr, &fl4->saddr); 536 else 537 pr_debug("no route\n"); 538 } 539 540 /* For v4, the source address is cached in the route entry(dst). So no need 541 * to cache it separately and hence this is an empty routine. 542 */ 543 static void sctp_v4_get_saddr(struct sctp_sock *sk, 544 struct sctp_transport *t, 545 struct flowi *fl) 546 { 547 union sctp_addr *saddr = &t->saddr; 548 struct rtable *rt = (struct rtable *)t->dst; 549 550 if (rt) { 551 saddr->v4.sin_family = AF_INET; 552 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; 553 } 554 } 555 556 /* What interface did this skb arrive on? */ 557 static int sctp_v4_skb_iif(const struct sk_buff *skb) 558 { 559 return inet_iif(skb); 560 } 561 562 /* Was this packet marked by Explicit Congestion Notification? */ 563 static int sctp_v4_is_ce(const struct sk_buff *skb) 564 { 565 return INET_ECN_is_ce(ip_hdr(skb)->tos); 566 } 567 568 /* Create and initialize a new sk for the socket returned by accept(). */ 569 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 570 struct sctp_association *asoc) 571 { 572 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 573 sk->sk_prot, 0); 574 struct inet_sock *newinet; 575 576 if (!newsk) 577 goto out; 578 579 sock_init_data(NULL, newsk); 580 581 sctp_copy_sock(newsk, sk, asoc); 582 sock_reset_flag(newsk, SOCK_ZAPPED); 583 584 newinet = inet_sk(newsk); 585 586 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 587 588 sk_refcnt_debug_inc(newsk); 589 590 if (newsk->sk_prot->init(newsk)) { 591 sk_common_release(newsk); 592 newsk = NULL; 593 } 594 595 out: 596 return newsk; 597 } 598 599 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr) 600 { 601 /* No address mapping for V4 sockets */ 602 return sizeof(struct sockaddr_in); 603 } 604 605 /* Dump the v4 addr to the seq file. */ 606 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 607 { 608 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 609 } 610 611 static void sctp_v4_ecn_capable(struct sock *sk) 612 { 613 INET_ECN_xmit(sk); 614 } 615 616 static void sctp_addr_wq_timeout_handler(unsigned long arg) 617 { 618 struct net *net = (struct net *)arg; 619 struct sctp_sockaddr_entry *addrw, *temp; 620 struct sctp_sock *sp; 621 622 spin_lock_bh(&net->sctp.addr_wq_lock); 623 624 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { 625 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at " 626 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa, 627 addrw->state, addrw); 628 629 #if IS_ENABLED(CONFIG_IPV6) 630 /* Now we send an ASCONF for each association */ 631 /* Note. we currently don't handle link local IPv6 addressees */ 632 if (addrw->a.sa.sa_family == AF_INET6) { 633 struct in6_addr *in6; 634 635 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) & 636 IPV6_ADDR_LINKLOCAL) 637 goto free_next; 638 639 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr; 640 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 && 641 addrw->state == SCTP_ADDR_NEW) { 642 unsigned long timeo_val; 643 644 pr_debug("%s: this is on DAD, trying %d sec " 645 "later\n", __func__, 646 SCTP_ADDRESS_TICK_DELAY); 647 648 timeo_val = jiffies; 649 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 650 mod_timer(&net->sctp.addr_wq_timer, timeo_val); 651 break; 652 } 653 } 654 #endif 655 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) { 656 struct sock *sk; 657 658 sk = sctp_opt2sk(sp); 659 /* ignore bound-specific endpoints */ 660 if (!sctp_is_ep_boundall(sk)) 661 continue; 662 bh_lock_sock(sk); 663 if (sctp_asconf_mgmt(sp, addrw) < 0) 664 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__); 665 bh_unlock_sock(sk); 666 } 667 #if IS_ENABLED(CONFIG_IPV6) 668 free_next: 669 #endif 670 list_del(&addrw->list); 671 kfree(addrw); 672 } 673 spin_unlock_bh(&net->sctp.addr_wq_lock); 674 } 675 676 static void sctp_free_addr_wq(struct net *net) 677 { 678 struct sctp_sockaddr_entry *addrw; 679 struct sctp_sockaddr_entry *temp; 680 681 spin_lock_bh(&net->sctp.addr_wq_lock); 682 del_timer(&net->sctp.addr_wq_timer); 683 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { 684 list_del(&addrw->list); 685 kfree(addrw); 686 } 687 spin_unlock_bh(&net->sctp.addr_wq_lock); 688 } 689 690 /* lookup the entry for the same address in the addr_waitq 691 * sctp_addr_wq MUST be locked 692 */ 693 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net, 694 struct sctp_sockaddr_entry *addr) 695 { 696 struct sctp_sockaddr_entry *addrw; 697 698 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) { 699 if (addrw->a.sa.sa_family != addr->a.sa.sa_family) 700 continue; 701 if (addrw->a.sa.sa_family == AF_INET) { 702 if (addrw->a.v4.sin_addr.s_addr == 703 addr->a.v4.sin_addr.s_addr) 704 return addrw; 705 } else if (addrw->a.sa.sa_family == AF_INET6) { 706 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr, 707 &addr->a.v6.sin6_addr)) 708 return addrw; 709 } 710 } 711 return NULL; 712 } 713 714 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd) 715 { 716 struct sctp_sockaddr_entry *addrw; 717 unsigned long timeo_val; 718 719 /* first, we check if an opposite message already exist in the queue. 720 * If we found such message, it is removed. 721 * This operation is a bit stupid, but the DHCP client attaches the 722 * new address after a couple of addition and deletion of that address 723 */ 724 725 spin_lock_bh(&net->sctp.addr_wq_lock); 726 /* Offsets existing events in addr_wq */ 727 addrw = sctp_addr_wq_lookup(net, addr); 728 if (addrw) { 729 if (addrw->state != cmd) { 730 pr_debug("%s: offsets existing entry for %d, addr:%pISc " 731 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa, 732 &net->sctp.addr_waitq); 733 734 list_del(&addrw->list); 735 kfree(addrw); 736 } 737 spin_unlock_bh(&net->sctp.addr_wq_lock); 738 return; 739 } 740 741 /* OK, we have to add the new address to the wait queue */ 742 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 743 if (addrw == NULL) { 744 spin_unlock_bh(&net->sctp.addr_wq_lock); 745 return; 746 } 747 addrw->state = cmd; 748 list_add_tail(&addrw->list, &net->sctp.addr_waitq); 749 750 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n", 751 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq); 752 753 if (!timer_pending(&net->sctp.addr_wq_timer)) { 754 timeo_val = jiffies; 755 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 756 mod_timer(&net->sctp.addr_wq_timer, timeo_val); 757 } 758 spin_unlock_bh(&net->sctp.addr_wq_lock); 759 } 760 761 /* Event handler for inet address addition/deletion events. 762 * The sctp_local_addr_list needs to be protocted by a spin lock since 763 * multiple notifiers (say IPv4 and IPv6) may be running at the same 764 * time and thus corrupt the list. 765 * The reader side is protected with RCU. 766 */ 767 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 768 void *ptr) 769 { 770 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 771 struct sctp_sockaddr_entry *addr = NULL; 772 struct sctp_sockaddr_entry *temp; 773 struct net *net = dev_net(ifa->ifa_dev->dev); 774 int found = 0; 775 776 switch (ev) { 777 case NETDEV_UP: 778 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 779 if (addr) { 780 addr->a.v4.sin_family = AF_INET; 781 addr->a.v4.sin_port = 0; 782 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 783 addr->valid = 1; 784 spin_lock_bh(&net->sctp.local_addr_lock); 785 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); 786 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); 787 spin_unlock_bh(&net->sctp.local_addr_lock); 788 } 789 break; 790 case NETDEV_DOWN: 791 spin_lock_bh(&net->sctp.local_addr_lock); 792 list_for_each_entry_safe(addr, temp, 793 &net->sctp.local_addr_list, list) { 794 if (addr->a.sa.sa_family == AF_INET && 795 addr->a.v4.sin_addr.s_addr == 796 ifa->ifa_local) { 797 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); 798 found = 1; 799 addr->valid = 0; 800 list_del_rcu(&addr->list); 801 break; 802 } 803 } 804 spin_unlock_bh(&net->sctp.local_addr_lock); 805 if (found) 806 kfree_rcu(addr, rcu); 807 break; 808 } 809 810 return NOTIFY_DONE; 811 } 812 813 /* 814 * Initialize the control inode/socket with a control endpoint data 815 * structure. This endpoint is reserved exclusively for the OOTB processing. 816 */ 817 static int sctp_ctl_sock_init(struct net *net) 818 { 819 int err; 820 sa_family_t family = PF_INET; 821 822 if (sctp_get_pf_specific(PF_INET6)) 823 family = PF_INET6; 824 825 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family, 826 SOCK_SEQPACKET, IPPROTO_SCTP, net); 827 828 /* If IPv6 socket could not be created, try the IPv4 socket */ 829 if (err < 0 && family == PF_INET6) 830 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET, 831 SOCK_SEQPACKET, IPPROTO_SCTP, 832 net); 833 834 if (err < 0) { 835 pr_err("Failed to create the SCTP control socket\n"); 836 return err; 837 } 838 return 0; 839 } 840 841 /* Register address family specific functions. */ 842 int sctp_register_af(struct sctp_af *af) 843 { 844 switch (af->sa_family) { 845 case AF_INET: 846 if (sctp_af_v4_specific) 847 return 0; 848 sctp_af_v4_specific = af; 849 break; 850 case AF_INET6: 851 if (sctp_af_v6_specific) 852 return 0; 853 sctp_af_v6_specific = af; 854 break; 855 default: 856 return 0; 857 } 858 859 INIT_LIST_HEAD(&af->list); 860 list_add_tail(&af->list, &sctp_address_families); 861 return 1; 862 } 863 864 /* Get the table of functions for manipulating a particular address 865 * family. 866 */ 867 struct sctp_af *sctp_get_af_specific(sa_family_t family) 868 { 869 switch (family) { 870 case AF_INET: 871 return sctp_af_v4_specific; 872 case AF_INET6: 873 return sctp_af_v6_specific; 874 default: 875 return NULL; 876 } 877 } 878 879 /* Common code to initialize a AF_INET msg_name. */ 880 static void sctp_inet_msgname(char *msgname, int *addr_len) 881 { 882 struct sockaddr_in *sin; 883 884 sin = (struct sockaddr_in *)msgname; 885 *addr_len = sizeof(struct sockaddr_in); 886 sin->sin_family = AF_INET; 887 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 888 } 889 890 /* Copy the primary address of the peer primary address as the msg_name. */ 891 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 892 int *addr_len) 893 { 894 struct sockaddr_in *sin, *sinfrom; 895 896 if (msgname) { 897 struct sctp_association *asoc; 898 899 asoc = event->asoc; 900 sctp_inet_msgname(msgname, addr_len); 901 sin = (struct sockaddr_in *)msgname; 902 sinfrom = &asoc->peer.primary_addr.v4; 903 sin->sin_port = htons(asoc->peer.port); 904 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 905 } 906 } 907 908 /* Initialize and copy out a msgname from an inbound skb. */ 909 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 910 { 911 if (msgname) { 912 struct sctphdr *sh = sctp_hdr(skb); 913 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 914 915 sctp_inet_msgname(msgname, len); 916 sin->sin_port = sh->source; 917 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 918 } 919 } 920 921 /* Do we support this AF? */ 922 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 923 { 924 /* PF_INET only supports AF_INET addresses. */ 925 return AF_INET == family; 926 } 927 928 /* Address matching with wildcards allowed. */ 929 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 930 const union sctp_addr *addr2, 931 struct sctp_sock *opt) 932 { 933 /* PF_INET only supports AF_INET addresses. */ 934 if (addr1->sa.sa_family != addr2->sa.sa_family) 935 return 0; 936 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 937 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 938 return 1; 939 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 940 return 1; 941 942 return 0; 943 } 944 945 /* Verify that provided sockaddr looks bindable. Common verification has 946 * already been taken care of. 947 */ 948 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 949 { 950 return sctp_v4_available(addr, opt); 951 } 952 953 /* Verify that sockaddr looks sendable. Common verification has already 954 * been taken care of. 955 */ 956 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 957 { 958 return 1; 959 } 960 961 /* Fill in Supported Address Type information for INIT and INIT-ACK 962 * chunks. Returns number of addresses supported. 963 */ 964 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 965 __be16 *types) 966 { 967 types[0] = SCTP_PARAM_IPV4_ADDRESS; 968 return 1; 969 } 970 971 /* Wrapper routine that calls the ip transmit routine. */ 972 static inline int sctp_v4_xmit(struct sk_buff *skb, 973 struct sctp_transport *transport) 974 { 975 struct inet_sock *inet = inet_sk(skb->sk); 976 977 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb, 978 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr); 979 980 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 981 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 982 983 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS); 984 985 return ip_queue_xmit(&inet->sk, skb, &transport->fl); 986 } 987 988 static struct sctp_af sctp_af_inet; 989 990 static struct sctp_pf sctp_pf_inet = { 991 .event_msgname = sctp_inet_event_msgname, 992 .skb_msgname = sctp_inet_skb_msgname, 993 .af_supported = sctp_inet_af_supported, 994 .cmp_addr = sctp_inet_cmp_addr, 995 .bind_verify = sctp_inet_bind_verify, 996 .send_verify = sctp_inet_send_verify, 997 .supported_addrs = sctp_inet_supported_addrs, 998 .create_accept_sk = sctp_v4_create_accept_sk, 999 .addr_to_user = sctp_v4_addr_to_user, 1000 .to_sk_saddr = sctp_v4_to_sk_saddr, 1001 .to_sk_daddr = sctp_v4_to_sk_daddr, 1002 .af = &sctp_af_inet 1003 }; 1004 1005 /* Notifier for inetaddr addition/deletion events. */ 1006 static struct notifier_block sctp_inetaddr_notifier = { 1007 .notifier_call = sctp_inetaddr_event, 1008 }; 1009 1010 /* Socket operations. */ 1011 static const struct proto_ops inet_seqpacket_ops = { 1012 .family = PF_INET, 1013 .owner = THIS_MODULE, 1014 .release = inet_release, /* Needs to be wrapped... */ 1015 .bind = inet_bind, 1016 .connect = inet_dgram_connect, 1017 .socketpair = sock_no_socketpair, 1018 .accept = inet_accept, 1019 .getname = inet_getname, /* Semantics are different. */ 1020 .poll = sctp_poll, 1021 .ioctl = inet_ioctl, 1022 .listen = sctp_inet_listen, 1023 .shutdown = inet_shutdown, /* Looks harmless. */ 1024 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 1025 .getsockopt = sock_common_getsockopt, 1026 .sendmsg = inet_sendmsg, 1027 .recvmsg = sock_common_recvmsg, 1028 .mmap = sock_no_mmap, 1029 .sendpage = sock_no_sendpage, 1030 #ifdef CONFIG_COMPAT 1031 .compat_setsockopt = compat_sock_common_setsockopt, 1032 .compat_getsockopt = compat_sock_common_getsockopt, 1033 #endif 1034 }; 1035 1036 /* Registration with AF_INET family. */ 1037 static struct inet_protosw sctp_seqpacket_protosw = { 1038 .type = SOCK_SEQPACKET, 1039 .protocol = IPPROTO_SCTP, 1040 .prot = &sctp_prot, 1041 .ops = &inet_seqpacket_ops, 1042 .flags = SCTP_PROTOSW_FLAG 1043 }; 1044 static struct inet_protosw sctp_stream_protosw = { 1045 .type = SOCK_STREAM, 1046 .protocol = IPPROTO_SCTP, 1047 .prot = &sctp_prot, 1048 .ops = &inet_seqpacket_ops, 1049 .flags = SCTP_PROTOSW_FLAG 1050 }; 1051 1052 /* Register with IP layer. */ 1053 static const struct net_protocol sctp_protocol = { 1054 .handler = sctp_rcv, 1055 .err_handler = sctp_v4_err, 1056 .no_policy = 1, 1057 .netns_ok = 1, 1058 .icmp_strict_tag_validation = 1, 1059 }; 1060 1061 /* IPv4 address related functions. */ 1062 static struct sctp_af sctp_af_inet = { 1063 .sa_family = AF_INET, 1064 .sctp_xmit = sctp_v4_xmit, 1065 .setsockopt = ip_setsockopt, 1066 .getsockopt = ip_getsockopt, 1067 .get_dst = sctp_v4_get_dst, 1068 .get_saddr = sctp_v4_get_saddr, 1069 .copy_addrlist = sctp_v4_copy_addrlist, 1070 .from_skb = sctp_v4_from_skb, 1071 .from_sk = sctp_v4_from_sk, 1072 .from_addr_param = sctp_v4_from_addr_param, 1073 .to_addr_param = sctp_v4_to_addr_param, 1074 .cmp_addr = sctp_v4_cmp_addr, 1075 .addr_valid = sctp_v4_addr_valid, 1076 .inaddr_any = sctp_v4_inaddr_any, 1077 .is_any = sctp_v4_is_any, 1078 .available = sctp_v4_available, 1079 .scope = sctp_v4_scope, 1080 .skb_iif = sctp_v4_skb_iif, 1081 .is_ce = sctp_v4_is_ce, 1082 .seq_dump_addr = sctp_v4_seq_dump_addr, 1083 .ecn_capable = sctp_v4_ecn_capable, 1084 .net_header_len = sizeof(struct iphdr), 1085 .sockaddr_len = sizeof(struct sockaddr_in), 1086 #ifdef CONFIG_COMPAT 1087 .compat_setsockopt = compat_ip_setsockopt, 1088 .compat_getsockopt = compat_ip_getsockopt, 1089 #endif 1090 }; 1091 1092 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) 1093 { 1094 switch (family) { 1095 case PF_INET: 1096 return sctp_pf_inet_specific; 1097 case PF_INET6: 1098 return sctp_pf_inet6_specific; 1099 default: 1100 return NULL; 1101 } 1102 } 1103 1104 /* Register the PF specific function table. */ 1105 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 1106 { 1107 switch (family) { 1108 case PF_INET: 1109 if (sctp_pf_inet_specific) 1110 return 0; 1111 sctp_pf_inet_specific = pf; 1112 break; 1113 case PF_INET6: 1114 if (sctp_pf_inet6_specific) 1115 return 0; 1116 sctp_pf_inet6_specific = pf; 1117 break; 1118 default: 1119 return 0; 1120 } 1121 return 1; 1122 } 1123 1124 static inline int init_sctp_mibs(struct net *net) 1125 { 1126 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib); 1127 if (!net->sctp.sctp_statistics) 1128 return -ENOMEM; 1129 return 0; 1130 } 1131 1132 static inline void cleanup_sctp_mibs(struct net *net) 1133 { 1134 free_percpu(net->sctp.sctp_statistics); 1135 } 1136 1137 static void sctp_v4_pf_init(void) 1138 { 1139 /* Initialize the SCTP specific PF functions. */ 1140 sctp_register_pf(&sctp_pf_inet, PF_INET); 1141 sctp_register_af(&sctp_af_inet); 1142 } 1143 1144 static void sctp_v4_pf_exit(void) 1145 { 1146 list_del(&sctp_af_inet.list); 1147 } 1148 1149 static int sctp_v4_protosw_init(void) 1150 { 1151 int rc; 1152 1153 rc = proto_register(&sctp_prot, 1); 1154 if (rc) 1155 return rc; 1156 1157 /* Register SCTP(UDP and TCP style) with socket layer. */ 1158 inet_register_protosw(&sctp_seqpacket_protosw); 1159 inet_register_protosw(&sctp_stream_protosw); 1160 1161 return 0; 1162 } 1163 1164 static void sctp_v4_protosw_exit(void) 1165 { 1166 inet_unregister_protosw(&sctp_stream_protosw); 1167 inet_unregister_protosw(&sctp_seqpacket_protosw); 1168 proto_unregister(&sctp_prot); 1169 } 1170 1171 static int sctp_v4_add_protocol(void) 1172 { 1173 /* Register notifier for inet address additions/deletions. */ 1174 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1175 1176 /* Register SCTP with inet layer. */ 1177 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1178 return -EAGAIN; 1179 1180 return 0; 1181 } 1182 1183 static void sctp_v4_del_protocol(void) 1184 { 1185 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1186 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1187 } 1188 1189 static int __net_init sctp_defaults_init(struct net *net) 1190 { 1191 int status; 1192 1193 /* 1194 * 14. Suggested SCTP Protocol Parameter Values 1195 */ 1196 /* The following protocol parameters are RECOMMENDED: */ 1197 /* RTO.Initial - 3 seconds */ 1198 net->sctp.rto_initial = SCTP_RTO_INITIAL; 1199 /* RTO.Min - 1 second */ 1200 net->sctp.rto_min = SCTP_RTO_MIN; 1201 /* RTO.Max - 60 seconds */ 1202 net->sctp.rto_max = SCTP_RTO_MAX; 1203 /* RTO.Alpha - 1/8 */ 1204 net->sctp.rto_alpha = SCTP_RTO_ALPHA; 1205 /* RTO.Beta - 1/4 */ 1206 net->sctp.rto_beta = SCTP_RTO_BETA; 1207 1208 /* Valid.Cookie.Life - 60 seconds */ 1209 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1210 1211 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1212 net->sctp.cookie_preserve_enable = 1; 1213 1214 /* Default sctp sockets to use md5 as their hmac alg */ 1215 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5) 1216 net->sctp.sctp_hmac_alg = "md5"; 1217 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1) 1218 net->sctp.sctp_hmac_alg = "sha1"; 1219 #else 1220 net->sctp.sctp_hmac_alg = NULL; 1221 #endif 1222 1223 /* Max.Burst - 4 */ 1224 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST; 1225 1226 /* Association.Max.Retrans - 10 attempts 1227 * Path.Max.Retrans - 5 attempts (per destination address) 1228 * Max.Init.Retransmits - 8 attempts 1229 */ 1230 net->sctp.max_retrans_association = 10; 1231 net->sctp.max_retrans_path = 5; 1232 net->sctp.max_retrans_init = 8; 1233 1234 /* Sendbuffer growth - do per-socket accounting */ 1235 net->sctp.sndbuf_policy = 0; 1236 1237 /* Rcvbuffer growth - do per-socket accounting */ 1238 net->sctp.rcvbuf_policy = 0; 1239 1240 /* HB.interval - 30 seconds */ 1241 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1242 1243 /* delayed SACK timeout */ 1244 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1245 1246 /* Disable ADDIP by default. */ 1247 net->sctp.addip_enable = 0; 1248 net->sctp.addip_noauth = 0; 1249 net->sctp.default_auto_asconf = 0; 1250 1251 /* Enable PR-SCTP by default. */ 1252 net->sctp.prsctp_enable = 1; 1253 1254 /* Disable AUTH by default. */ 1255 net->sctp.auth_enable = 0; 1256 1257 /* Set SCOPE policy to enabled */ 1258 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE; 1259 1260 /* Set the default rwnd update threshold */ 1261 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; 1262 1263 /* Initialize maximum autoclose timeout. */ 1264 net->sctp.max_autoclose = INT_MAX / HZ; 1265 1266 status = sctp_sysctl_net_register(net); 1267 if (status) 1268 goto err_sysctl_register; 1269 1270 /* Allocate and initialise sctp mibs. */ 1271 status = init_sctp_mibs(net); 1272 if (status) 1273 goto err_init_mibs; 1274 1275 /* Initialize proc fs directory. */ 1276 status = sctp_proc_init(net); 1277 if (status) 1278 goto err_init_proc; 1279 1280 sctp_dbg_objcnt_init(net); 1281 1282 /* Initialize the local address list. */ 1283 INIT_LIST_HEAD(&net->sctp.local_addr_list); 1284 spin_lock_init(&net->sctp.local_addr_lock); 1285 sctp_get_local_addr_list(net); 1286 1287 /* Initialize the address event list */ 1288 INIT_LIST_HEAD(&net->sctp.addr_waitq); 1289 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist); 1290 spin_lock_init(&net->sctp.addr_wq_lock); 1291 net->sctp.addr_wq_timer.expires = 0; 1292 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 1293 (unsigned long)net); 1294 1295 return 0; 1296 1297 err_init_proc: 1298 cleanup_sctp_mibs(net); 1299 err_init_mibs: 1300 sctp_sysctl_net_unregister(net); 1301 err_sysctl_register: 1302 return status; 1303 } 1304 1305 static void __net_exit sctp_defaults_exit(struct net *net) 1306 { 1307 /* Free the local address list */ 1308 sctp_free_addr_wq(net); 1309 sctp_free_local_addr_list(net); 1310 1311 sctp_dbg_objcnt_exit(net); 1312 1313 sctp_proc_exit(net); 1314 cleanup_sctp_mibs(net); 1315 sctp_sysctl_net_unregister(net); 1316 } 1317 1318 static struct pernet_operations sctp_defaults_ops = { 1319 .init = sctp_defaults_init, 1320 .exit = sctp_defaults_exit, 1321 }; 1322 1323 static int __net_init sctp_ctrlsock_init(struct net *net) 1324 { 1325 int status; 1326 1327 /* Initialize the control inode/socket for handling OOTB packets. */ 1328 status = sctp_ctl_sock_init(net); 1329 if (status) 1330 pr_err("Failed to initialize the SCTP control sock\n"); 1331 1332 return status; 1333 } 1334 1335 static void __net_init sctp_ctrlsock_exit(struct net *net) 1336 { 1337 /* Free the control endpoint. */ 1338 inet_ctl_sock_destroy(net->sctp.ctl_sock); 1339 } 1340 1341 static struct pernet_operations sctp_ctrlsock_ops = { 1342 .init = sctp_ctrlsock_init, 1343 .exit = sctp_ctrlsock_exit, 1344 }; 1345 1346 /* Initialize the universe into something sensible. */ 1347 static __init int sctp_init(void) 1348 { 1349 int i; 1350 int status = -EINVAL; 1351 unsigned long goal; 1352 unsigned long limit; 1353 int max_share; 1354 int order; 1355 1356 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent)); 1357 1358 /* Allocate bind_bucket and chunk caches. */ 1359 status = -ENOBUFS; 1360 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1361 sizeof(struct sctp_bind_bucket), 1362 0, SLAB_HWCACHE_ALIGN, 1363 NULL); 1364 if (!sctp_bucket_cachep) 1365 goto out; 1366 1367 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1368 sizeof(struct sctp_chunk), 1369 0, SLAB_HWCACHE_ALIGN, 1370 NULL); 1371 if (!sctp_chunk_cachep) 1372 goto err_chunk_cachep; 1373 1374 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL); 1375 if (status) 1376 goto err_percpu_counter_init; 1377 1378 /* Implementation specific variables. */ 1379 1380 /* Initialize default stream count setup information. */ 1381 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1382 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1383 1384 /* Initialize handle used for association ids. */ 1385 idr_init(&sctp_assocs_id); 1386 1387 limit = nr_free_buffer_pages() / 8; 1388 limit = max(limit, 128UL); 1389 sysctl_sctp_mem[0] = limit / 4 * 3; 1390 sysctl_sctp_mem[1] = limit; 1391 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1392 1393 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1394 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1395 max_share = min(4UL*1024*1024, limit); 1396 1397 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1398 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1); 1399 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1400 1401 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1402 sysctl_sctp_wmem[1] = 16*1024; 1403 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1404 1405 /* Size and allocate the association hash table. 1406 * The methodology is similar to that of the tcp hash tables. 1407 */ 1408 if (totalram_pages >= (128 * 1024)) 1409 goal = totalram_pages >> (22 - PAGE_SHIFT); 1410 else 1411 goal = totalram_pages >> (24 - PAGE_SHIFT); 1412 1413 for (order = 0; (1UL << order) < goal; order++) 1414 ; 1415 1416 do { 1417 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1418 sizeof(struct sctp_hashbucket); 1419 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1420 continue; 1421 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1422 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); 1423 } while (!sctp_assoc_hashtable && --order > 0); 1424 if (!sctp_assoc_hashtable) { 1425 pr_err("Failed association hash alloc\n"); 1426 status = -ENOMEM; 1427 goto err_ahash_alloc; 1428 } 1429 for (i = 0; i < sctp_assoc_hashsize; i++) { 1430 rwlock_init(&sctp_assoc_hashtable[i].lock); 1431 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1432 } 1433 1434 /* Allocate and initialize the endpoint hash table. */ 1435 sctp_ep_hashsize = 64; 1436 sctp_ep_hashtable = 1437 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1438 if (!sctp_ep_hashtable) { 1439 pr_err("Failed endpoint_hash alloc\n"); 1440 status = -ENOMEM; 1441 goto err_ehash_alloc; 1442 } 1443 for (i = 0; i < sctp_ep_hashsize; i++) { 1444 rwlock_init(&sctp_ep_hashtable[i].lock); 1445 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1446 } 1447 1448 /* Allocate and initialize the SCTP port hash table. */ 1449 do { 1450 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1451 sizeof(struct sctp_bind_hashbucket); 1452 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1453 continue; 1454 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1455 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); 1456 } while (!sctp_port_hashtable && --order > 0); 1457 if (!sctp_port_hashtable) { 1458 pr_err("Failed bind hash alloc\n"); 1459 status = -ENOMEM; 1460 goto err_bhash_alloc; 1461 } 1462 for (i = 0; i < sctp_port_hashsize; i++) { 1463 spin_lock_init(&sctp_port_hashtable[i].lock); 1464 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1465 } 1466 1467 pr_info("Hash tables configured (established %d bind %d)\n", 1468 sctp_assoc_hashsize, sctp_port_hashsize); 1469 1470 sctp_sysctl_register(); 1471 1472 INIT_LIST_HEAD(&sctp_address_families); 1473 sctp_v4_pf_init(); 1474 sctp_v6_pf_init(); 1475 1476 status = register_pernet_subsys(&sctp_defaults_ops); 1477 if (status) 1478 goto err_register_defaults; 1479 1480 status = sctp_v4_protosw_init(); 1481 if (status) 1482 goto err_protosw_init; 1483 1484 status = sctp_v6_protosw_init(); 1485 if (status) 1486 goto err_v6_protosw_init; 1487 1488 status = register_pernet_subsys(&sctp_ctrlsock_ops); 1489 if (status) 1490 goto err_register_ctrlsock; 1491 1492 status = sctp_v4_add_protocol(); 1493 if (status) 1494 goto err_add_protocol; 1495 1496 /* Register SCTP with inet6 layer. */ 1497 status = sctp_v6_add_protocol(); 1498 if (status) 1499 goto err_v6_add_protocol; 1500 1501 out: 1502 return status; 1503 err_v6_add_protocol: 1504 sctp_v4_del_protocol(); 1505 err_add_protocol: 1506 unregister_pernet_subsys(&sctp_ctrlsock_ops); 1507 err_register_ctrlsock: 1508 sctp_v6_protosw_exit(); 1509 err_v6_protosw_init: 1510 sctp_v4_protosw_exit(); 1511 err_protosw_init: 1512 unregister_pernet_subsys(&sctp_defaults_ops); 1513 err_register_defaults: 1514 sctp_v4_pf_exit(); 1515 sctp_v6_pf_exit(); 1516 sctp_sysctl_unregister(); 1517 free_pages((unsigned long)sctp_port_hashtable, 1518 get_order(sctp_port_hashsize * 1519 sizeof(struct sctp_bind_hashbucket))); 1520 err_bhash_alloc: 1521 kfree(sctp_ep_hashtable); 1522 err_ehash_alloc: 1523 free_pages((unsigned long)sctp_assoc_hashtable, 1524 get_order(sctp_assoc_hashsize * 1525 sizeof(struct sctp_hashbucket))); 1526 err_ahash_alloc: 1527 percpu_counter_destroy(&sctp_sockets_allocated); 1528 err_percpu_counter_init: 1529 kmem_cache_destroy(sctp_chunk_cachep); 1530 err_chunk_cachep: 1531 kmem_cache_destroy(sctp_bucket_cachep); 1532 goto out; 1533 } 1534 1535 /* Exit handler for the SCTP protocol. */ 1536 static __exit void sctp_exit(void) 1537 { 1538 /* BUG. This should probably do something useful like clean 1539 * up all the remaining associations and all that memory. 1540 */ 1541 1542 /* Unregister with inet6/inet layers. */ 1543 sctp_v6_del_protocol(); 1544 sctp_v4_del_protocol(); 1545 1546 unregister_pernet_subsys(&sctp_ctrlsock_ops); 1547 1548 /* Free protosw registrations */ 1549 sctp_v6_protosw_exit(); 1550 sctp_v4_protosw_exit(); 1551 1552 unregister_pernet_subsys(&sctp_defaults_ops); 1553 1554 /* Unregister with socket layer. */ 1555 sctp_v6_pf_exit(); 1556 sctp_v4_pf_exit(); 1557 1558 sctp_sysctl_unregister(); 1559 1560 free_pages((unsigned long)sctp_assoc_hashtable, 1561 get_order(sctp_assoc_hashsize * 1562 sizeof(struct sctp_hashbucket))); 1563 kfree(sctp_ep_hashtable); 1564 free_pages((unsigned long)sctp_port_hashtable, 1565 get_order(sctp_port_hashsize * 1566 sizeof(struct sctp_bind_hashbucket))); 1567 1568 percpu_counter_destroy(&sctp_sockets_allocated); 1569 1570 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1571 1572 kmem_cache_destroy(sctp_chunk_cachep); 1573 kmem_cache_destroy(sctp_bucket_cachep); 1574 } 1575 1576 module_init(sctp_init); 1577 module_exit(sctp_exit); 1578 1579 /* 1580 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1581 */ 1582 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1583 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1584 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>"); 1585 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1586 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1587 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1588 MODULE_LICENSE("GPL"); 1589