1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * Copyright (c) 2001 Nokia, Inc. 7 * Copyright (c) 2001 La Monte H.P. Yarroll 8 * 9 * This file is part of the SCTP kernel implementation 10 * 11 * Initialization/cleanup for SCTP protocol support. 12 * 13 * This SCTP implementation is free software; 14 * you can redistribute it and/or modify it under the terms of 15 * the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 * This SCTP implementation is distributed in the hope that it 20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 21 * ************************ 22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 23 * See the GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with GNU CC; see the file COPYING. If not, write to 27 * the Free Software Foundation, 59 Temple Place - Suite 330, 28 * Boston, MA 02111-1307, USA. 29 * 30 * Please send any bug reports or fixes you make to the 31 * email address(es): 32 * lksctp developers <lksctp-developers@lists.sourceforge.net> 33 * 34 * Or submit a bug report through the following website: 35 * http://www.sf.net/projects/lksctp 36 * 37 * Written or modified by: 38 * La Monte H.P. Yarroll <piggy@acm.org> 39 * Karl Knutson <karl@athena.chicago.il.us> 40 * Jon Grimm <jgrimm@us.ibm.com> 41 * Sridhar Samudrala <sri@us.ibm.com> 42 * Daisy Chang <daisyc@us.ibm.com> 43 * Ardelle Fan <ardelle.fan@intel.com> 44 * 45 * Any bugs reported given to us we will try to fix... any fixes shared will 46 * be incorporated into the next SCTP release. 47 */ 48 49 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 50 51 #include <linux/module.h> 52 #include <linux/init.h> 53 #include <linux/netdevice.h> 54 #include <linux/inetdevice.h> 55 #include <linux/seq_file.h> 56 #include <linux/bootmem.h> 57 #include <linux/highmem.h> 58 #include <linux/swap.h> 59 #include <linux/slab.h> 60 #include <net/net_namespace.h> 61 #include <net/protocol.h> 62 #include <net/ip.h> 63 #include <net/ipv6.h> 64 #include <net/route.h> 65 #include <net/sctp/sctp.h> 66 #include <net/addrconf.h> 67 #include <net/inet_common.h> 68 #include <net/inet_ecn.h> 69 70 /* Global data structures. */ 71 struct sctp_globals sctp_globals __read_mostly; 72 73 struct idr sctp_assocs_id; 74 DEFINE_SPINLOCK(sctp_assocs_id_lock); 75 76 static struct sctp_pf *sctp_pf_inet6_specific; 77 static struct sctp_pf *sctp_pf_inet_specific; 78 static struct sctp_af *sctp_af_v4_specific; 79 static struct sctp_af *sctp_af_v6_specific; 80 81 struct kmem_cache *sctp_chunk_cachep __read_mostly; 82 struct kmem_cache *sctp_bucket_cachep __read_mostly; 83 84 long sysctl_sctp_mem[3]; 85 int sysctl_sctp_rmem[3]; 86 int sysctl_sctp_wmem[3]; 87 88 /* Set up the proc fs entry for the SCTP protocol. */ 89 static int __net_init sctp_proc_init(struct net *net) 90 { 91 #ifdef CONFIG_PROC_FS 92 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); 93 if (!net->sctp.proc_net_sctp) 94 goto out_proc_net_sctp; 95 if (sctp_snmp_proc_init(net)) 96 goto out_snmp_proc_init; 97 if (sctp_eps_proc_init(net)) 98 goto out_eps_proc_init; 99 if (sctp_assocs_proc_init(net)) 100 goto out_assocs_proc_init; 101 if (sctp_remaddr_proc_init(net)) 102 goto out_remaddr_proc_init; 103 104 return 0; 105 106 out_remaddr_proc_init: 107 sctp_assocs_proc_exit(net); 108 out_assocs_proc_init: 109 sctp_eps_proc_exit(net); 110 out_eps_proc_init: 111 sctp_snmp_proc_exit(net); 112 out_snmp_proc_init: 113 remove_proc_entry("sctp", net->proc_net); 114 net->sctp.proc_net_sctp = NULL; 115 out_proc_net_sctp: 116 return -ENOMEM; 117 #endif /* CONFIG_PROC_FS */ 118 return 0; 119 } 120 121 /* Clean up the proc fs entry for the SCTP protocol. 122 * Note: Do not make this __exit as it is used in the init error 123 * path. 124 */ 125 static void sctp_proc_exit(struct net *net) 126 { 127 #ifdef CONFIG_PROC_FS 128 sctp_snmp_proc_exit(net); 129 sctp_eps_proc_exit(net); 130 sctp_assocs_proc_exit(net); 131 sctp_remaddr_proc_exit(net); 132 133 remove_proc_entry("sctp", net->proc_net); 134 net->sctp.proc_net_sctp = NULL; 135 #endif 136 } 137 138 /* Private helper to extract ipv4 address and stash them in 139 * the protocol structure. 140 */ 141 static void sctp_v4_copy_addrlist(struct list_head *addrlist, 142 struct net_device *dev) 143 { 144 struct in_device *in_dev; 145 struct in_ifaddr *ifa; 146 struct sctp_sockaddr_entry *addr; 147 148 rcu_read_lock(); 149 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 150 rcu_read_unlock(); 151 return; 152 } 153 154 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 155 /* Add the address to the local list. */ 156 addr = kzalloc(sizeof(*addr), GFP_ATOMIC); 157 if (addr) { 158 addr->a.v4.sin_family = AF_INET; 159 addr->a.v4.sin_port = 0; 160 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 161 addr->valid = 1; 162 INIT_LIST_HEAD(&addr->list); 163 list_add_tail(&addr->list, addrlist); 164 } 165 } 166 167 rcu_read_unlock(); 168 } 169 170 /* Extract our IP addresses from the system and stash them in the 171 * protocol structure. 172 */ 173 static void sctp_get_local_addr_list(struct net *net) 174 { 175 struct net_device *dev; 176 struct list_head *pos; 177 struct sctp_af *af; 178 179 rcu_read_lock(); 180 for_each_netdev_rcu(net, dev) { 181 list_for_each(pos, &sctp_address_families) { 182 af = list_entry(pos, struct sctp_af, list); 183 af->copy_addrlist(&net->sctp.local_addr_list, dev); 184 } 185 } 186 rcu_read_unlock(); 187 } 188 189 /* Free the existing local addresses. */ 190 static void sctp_free_local_addr_list(struct net *net) 191 { 192 struct sctp_sockaddr_entry *addr; 193 struct list_head *pos, *temp; 194 195 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) { 196 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 197 list_del(pos); 198 kfree(addr); 199 } 200 } 201 202 /* Copy the local addresses which are valid for 'scope' into 'bp'. */ 203 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp, 204 sctp_scope_t scope, gfp_t gfp, int copy_flags) 205 { 206 struct sctp_sockaddr_entry *addr; 207 int error = 0; 208 209 rcu_read_lock(); 210 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) { 211 if (!addr->valid) 212 continue; 213 if (sctp_in_scope(net, &addr->a, scope)) { 214 /* Now that the address is in scope, check to see if 215 * the address type is really supported by the local 216 * sock as well as the remote peer. 217 */ 218 if ((((AF_INET == addr->a.sa.sa_family) && 219 (copy_flags & SCTP_ADDR4_PEERSUPP))) || 220 (((AF_INET6 == addr->a.sa.sa_family) && 221 (copy_flags & SCTP_ADDR6_ALLOWED) && 222 (copy_flags & SCTP_ADDR6_PEERSUPP)))) { 223 error = sctp_add_bind_addr(bp, &addr->a, 224 SCTP_ADDR_SRC, GFP_ATOMIC); 225 if (error) 226 goto end_copy; 227 } 228 } 229 } 230 231 end_copy: 232 rcu_read_unlock(); 233 return error; 234 } 235 236 /* Initialize a sctp_addr from in incoming skb. */ 237 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 238 int is_saddr) 239 { 240 void *from; 241 __be16 *port; 242 struct sctphdr *sh; 243 244 port = &addr->v4.sin_port; 245 addr->v4.sin_family = AF_INET; 246 247 sh = sctp_hdr(skb); 248 if (is_saddr) { 249 *port = sh->source; 250 from = &ip_hdr(skb)->saddr; 251 } else { 252 *port = sh->dest; 253 from = &ip_hdr(skb)->daddr; 254 } 255 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); 256 } 257 258 /* Initialize an sctp_addr from a socket. */ 259 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 260 { 261 addr->v4.sin_family = AF_INET; 262 addr->v4.sin_port = 0; 263 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; 264 } 265 266 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 267 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 268 { 269 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; 270 } 271 272 /* Initialize sk->sk_daddr from sctp_addr. */ 273 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 274 { 275 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; 276 } 277 278 /* Initialize a sctp_addr from an address parameter. */ 279 static void sctp_v4_from_addr_param(union sctp_addr *addr, 280 union sctp_addr_param *param, 281 __be16 port, int iif) 282 { 283 addr->v4.sin_family = AF_INET; 284 addr->v4.sin_port = port; 285 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 286 } 287 288 /* Initialize an address parameter from a sctp_addr and return the length 289 * of the address parameter. 290 */ 291 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 292 union sctp_addr_param *param) 293 { 294 int length = sizeof(sctp_ipv4addr_param_t); 295 296 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 297 param->v4.param_hdr.length = htons(length); 298 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 299 300 return length; 301 } 302 303 /* Initialize a sctp_addr from a dst_entry. */ 304 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4, 305 __be16 port) 306 { 307 saddr->v4.sin_family = AF_INET; 308 saddr->v4.sin_port = port; 309 saddr->v4.sin_addr.s_addr = fl4->saddr; 310 } 311 312 /* Compare two addresses exactly. */ 313 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 314 const union sctp_addr *addr2) 315 { 316 if (addr1->sa.sa_family != addr2->sa.sa_family) 317 return 0; 318 if (addr1->v4.sin_port != addr2->v4.sin_port) 319 return 0; 320 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 321 return 0; 322 323 return 1; 324 } 325 326 /* Initialize addr struct to INADDR_ANY. */ 327 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 328 { 329 addr->v4.sin_family = AF_INET; 330 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 331 addr->v4.sin_port = port; 332 } 333 334 /* Is this a wildcard address? */ 335 static int sctp_v4_is_any(const union sctp_addr *addr) 336 { 337 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 338 } 339 340 /* This function checks if the address is a valid address to be used for 341 * SCTP binding. 342 * 343 * Output: 344 * Return 0 - If the address is a non-unicast or an illegal address. 345 * Return 1 - If the address is a unicast. 346 */ 347 static int sctp_v4_addr_valid(union sctp_addr *addr, 348 struct sctp_sock *sp, 349 const struct sk_buff *skb) 350 { 351 /* IPv4 addresses not allowed */ 352 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 353 return 0; 354 355 /* Is this a non-unicast address or a unusable SCTP address? */ 356 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 357 return 0; 358 359 /* Is this a broadcast address? */ 360 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) 361 return 0; 362 363 return 1; 364 } 365 366 /* Should this be available for binding? */ 367 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 368 { 369 struct net *net = sock_net(&sp->inet.sk); 370 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr); 371 372 373 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 374 ret != RTN_LOCAL && 375 !sp->inet.freebind && 376 !sysctl_ip_nonlocal_bind) 377 return 0; 378 379 if (ipv6_only_sock(sctp_opt2sk(sp))) 380 return 0; 381 382 return 1; 383 } 384 385 /* Checking the loopback, private and other address scopes as defined in 386 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 387 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 388 * 389 * Level 0 - unusable SCTP addresses 390 * Level 1 - loopback address 391 * Level 2 - link-local addresses 392 * Level 3 - private addresses. 393 * Level 4 - global addresses 394 * For INIT and INIT-ACK address list, let L be the level of 395 * of requested destination address, sender and receiver 396 * SHOULD include all of its addresses with level greater 397 * than or equal to L. 398 * 399 * IPv4 scoping can be controlled through sysctl option 400 * net.sctp.addr_scope_policy 401 */ 402 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 403 { 404 sctp_scope_t retval; 405 406 /* Check for unusable SCTP addresses. */ 407 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 408 retval = SCTP_SCOPE_UNUSABLE; 409 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 410 retval = SCTP_SCOPE_LOOPBACK; 411 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 412 retval = SCTP_SCOPE_LINK; 413 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 414 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 415 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { 416 retval = SCTP_SCOPE_PRIVATE; 417 } else { 418 retval = SCTP_SCOPE_GLOBAL; 419 } 420 421 return retval; 422 } 423 424 /* Returns a valid dst cache entry for the given source and destination ip 425 * addresses. If an association is passed, trys to get a dst entry with a 426 * source address that matches an address in the bind address list. 427 */ 428 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr, 429 struct flowi *fl, struct sock *sk) 430 { 431 struct sctp_association *asoc = t->asoc; 432 struct rtable *rt; 433 struct flowi4 *fl4 = &fl->u.ip4; 434 struct sctp_bind_addr *bp; 435 struct sctp_sockaddr_entry *laddr; 436 struct dst_entry *dst = NULL; 437 union sctp_addr *daddr = &t->ipaddr; 438 union sctp_addr dst_saddr; 439 440 memset(fl4, 0x0, sizeof(struct flowi4)); 441 fl4->daddr = daddr->v4.sin_addr.s_addr; 442 fl4->fl4_dport = daddr->v4.sin_port; 443 fl4->flowi4_proto = IPPROTO_SCTP; 444 if (asoc) { 445 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk); 446 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if; 447 fl4->fl4_sport = htons(asoc->base.bind_addr.port); 448 } 449 if (saddr) { 450 fl4->saddr = saddr->v4.sin_addr.s_addr; 451 fl4->fl4_sport = saddr->v4.sin_port; 452 } 453 454 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr, 455 &fl4->saddr); 456 457 rt = ip_route_output_key(sock_net(sk), fl4); 458 if (!IS_ERR(rt)) 459 dst = &rt->dst; 460 461 /* If there is no association or if a source address is passed, no 462 * more validation is required. 463 */ 464 if (!asoc || saddr) 465 goto out; 466 467 bp = &asoc->base.bind_addr; 468 469 if (dst) { 470 /* Walk through the bind address list and look for a bind 471 * address that matches the source address of the returned dst. 472 */ 473 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port)); 474 rcu_read_lock(); 475 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 476 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) || 477 (laddr->state != SCTP_ADDR_SRC && 478 !asoc->src_out_of_asoc_ok)) 479 continue; 480 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 481 goto out_unlock; 482 } 483 rcu_read_unlock(); 484 485 /* None of the bound addresses match the source address of the 486 * dst. So release it. 487 */ 488 dst_release(dst); 489 dst = NULL; 490 } 491 492 /* Walk through the bind address list and try to get a dst that 493 * matches a bind address as the source address. 494 */ 495 rcu_read_lock(); 496 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 497 if (!laddr->valid) 498 continue; 499 if ((laddr->state == SCTP_ADDR_SRC) && 500 (AF_INET == laddr->a.sa.sa_family)) { 501 fl4->saddr = laddr->a.v4.sin_addr.s_addr; 502 fl4->fl4_sport = laddr->a.v4.sin_port; 503 rt = ip_route_output_key(sock_net(sk), fl4); 504 if (!IS_ERR(rt)) { 505 dst = &rt->dst; 506 goto out_unlock; 507 } 508 } 509 } 510 511 out_unlock: 512 rcu_read_unlock(); 513 out: 514 t->dst = dst; 515 if (dst) 516 pr_debug("rt_dst:%pI4, rt_src:%pI4\n", 517 &fl4->daddr, &fl4->saddr); 518 else 519 pr_debug("no route\n"); 520 } 521 522 /* For v4, the source address is cached in the route entry(dst). So no need 523 * to cache it separately and hence this is an empty routine. 524 */ 525 static void sctp_v4_get_saddr(struct sctp_sock *sk, 526 struct sctp_transport *t, 527 struct flowi *fl) 528 { 529 union sctp_addr *saddr = &t->saddr; 530 struct rtable *rt = (struct rtable *)t->dst; 531 532 if (rt) { 533 saddr->v4.sin_family = AF_INET; 534 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; 535 } 536 } 537 538 /* What interface did this skb arrive on? */ 539 static int sctp_v4_skb_iif(const struct sk_buff *skb) 540 { 541 return inet_iif(skb); 542 } 543 544 /* Was this packet marked by Explicit Congestion Notification? */ 545 static int sctp_v4_is_ce(const struct sk_buff *skb) 546 { 547 return INET_ECN_is_ce(ip_hdr(skb)->tos); 548 } 549 550 /* Create and initialize a new sk for the socket returned by accept(). */ 551 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 552 struct sctp_association *asoc) 553 { 554 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 555 sk->sk_prot); 556 struct inet_sock *newinet; 557 558 if (!newsk) 559 goto out; 560 561 sock_init_data(NULL, newsk); 562 563 sctp_copy_sock(newsk, sk, asoc); 564 sock_reset_flag(newsk, SOCK_ZAPPED); 565 566 newinet = inet_sk(newsk); 567 568 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 569 570 sk_refcnt_debug_inc(newsk); 571 572 if (newsk->sk_prot->init(newsk)) { 573 sk_common_release(newsk); 574 newsk = NULL; 575 } 576 577 out: 578 return newsk; 579 } 580 581 /* Map address, empty for v4 family */ 582 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 583 { 584 /* Empty */ 585 } 586 587 /* Dump the v4 addr to the seq file. */ 588 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 589 { 590 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 591 } 592 593 static void sctp_v4_ecn_capable(struct sock *sk) 594 { 595 INET_ECN_xmit(sk); 596 } 597 598 static void sctp_addr_wq_timeout_handler(unsigned long arg) 599 { 600 struct net *net = (struct net *)arg; 601 struct sctp_sockaddr_entry *addrw, *temp; 602 struct sctp_sock *sp; 603 604 spin_lock_bh(&net->sctp.addr_wq_lock); 605 606 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { 607 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at " 608 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa, 609 addrw->state, addrw); 610 611 #if IS_ENABLED(CONFIG_IPV6) 612 /* Now we send an ASCONF for each association */ 613 /* Note. we currently don't handle link local IPv6 addressees */ 614 if (addrw->a.sa.sa_family == AF_INET6) { 615 struct in6_addr *in6; 616 617 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) & 618 IPV6_ADDR_LINKLOCAL) 619 goto free_next; 620 621 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr; 622 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 && 623 addrw->state == SCTP_ADDR_NEW) { 624 unsigned long timeo_val; 625 626 pr_debug("%s: this is on DAD, trying %d sec " 627 "later\n", __func__, 628 SCTP_ADDRESS_TICK_DELAY); 629 630 timeo_val = jiffies; 631 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 632 mod_timer(&net->sctp.addr_wq_timer, timeo_val); 633 break; 634 } 635 } 636 #endif 637 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) { 638 struct sock *sk; 639 640 sk = sctp_opt2sk(sp); 641 /* ignore bound-specific endpoints */ 642 if (!sctp_is_ep_boundall(sk)) 643 continue; 644 sctp_bh_lock_sock(sk); 645 if (sctp_asconf_mgmt(sp, addrw) < 0) 646 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__); 647 sctp_bh_unlock_sock(sk); 648 } 649 #if IS_ENABLED(CONFIG_IPV6) 650 free_next: 651 #endif 652 list_del(&addrw->list); 653 kfree(addrw); 654 } 655 spin_unlock_bh(&net->sctp.addr_wq_lock); 656 } 657 658 static void sctp_free_addr_wq(struct net *net) 659 { 660 struct sctp_sockaddr_entry *addrw; 661 struct sctp_sockaddr_entry *temp; 662 663 spin_lock_bh(&net->sctp.addr_wq_lock); 664 del_timer(&net->sctp.addr_wq_timer); 665 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { 666 list_del(&addrw->list); 667 kfree(addrw); 668 } 669 spin_unlock_bh(&net->sctp.addr_wq_lock); 670 } 671 672 /* lookup the entry for the same address in the addr_waitq 673 * sctp_addr_wq MUST be locked 674 */ 675 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net, 676 struct sctp_sockaddr_entry *addr) 677 { 678 struct sctp_sockaddr_entry *addrw; 679 680 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) { 681 if (addrw->a.sa.sa_family != addr->a.sa.sa_family) 682 continue; 683 if (addrw->a.sa.sa_family == AF_INET) { 684 if (addrw->a.v4.sin_addr.s_addr == 685 addr->a.v4.sin_addr.s_addr) 686 return addrw; 687 } else if (addrw->a.sa.sa_family == AF_INET6) { 688 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr, 689 &addr->a.v6.sin6_addr)) 690 return addrw; 691 } 692 } 693 return NULL; 694 } 695 696 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd) 697 { 698 struct sctp_sockaddr_entry *addrw; 699 unsigned long timeo_val; 700 701 /* first, we check if an opposite message already exist in the queue. 702 * If we found such message, it is removed. 703 * This operation is a bit stupid, but the DHCP client attaches the 704 * new address after a couple of addition and deletion of that address 705 */ 706 707 spin_lock_bh(&net->sctp.addr_wq_lock); 708 /* Offsets existing events in addr_wq */ 709 addrw = sctp_addr_wq_lookup(net, addr); 710 if (addrw) { 711 if (addrw->state != cmd) { 712 pr_debug("%s: offsets existing entry for %d, addr:%pISc " 713 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa, 714 &net->sctp.addr_waitq); 715 716 list_del(&addrw->list); 717 kfree(addrw); 718 } 719 spin_unlock_bh(&net->sctp.addr_wq_lock); 720 return; 721 } 722 723 /* OK, we have to add the new address to the wait queue */ 724 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 725 if (addrw == NULL) { 726 spin_unlock_bh(&net->sctp.addr_wq_lock); 727 return; 728 } 729 addrw->state = cmd; 730 list_add_tail(&addrw->list, &net->sctp.addr_waitq); 731 732 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n", 733 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq); 734 735 if (!timer_pending(&net->sctp.addr_wq_timer)) { 736 timeo_val = jiffies; 737 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 738 mod_timer(&net->sctp.addr_wq_timer, timeo_val); 739 } 740 spin_unlock_bh(&net->sctp.addr_wq_lock); 741 } 742 743 /* Event handler for inet address addition/deletion events. 744 * The sctp_local_addr_list needs to be protocted by a spin lock since 745 * multiple notifiers (say IPv4 and IPv6) may be running at the same 746 * time and thus corrupt the list. 747 * The reader side is protected with RCU. 748 */ 749 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 750 void *ptr) 751 { 752 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 753 struct sctp_sockaddr_entry *addr = NULL; 754 struct sctp_sockaddr_entry *temp; 755 struct net *net = dev_net(ifa->ifa_dev->dev); 756 int found = 0; 757 758 switch (ev) { 759 case NETDEV_UP: 760 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 761 if (addr) { 762 addr->a.v4.sin_family = AF_INET; 763 addr->a.v4.sin_port = 0; 764 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 765 addr->valid = 1; 766 spin_lock_bh(&net->sctp.local_addr_lock); 767 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); 768 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); 769 spin_unlock_bh(&net->sctp.local_addr_lock); 770 } 771 break; 772 case NETDEV_DOWN: 773 spin_lock_bh(&net->sctp.local_addr_lock); 774 list_for_each_entry_safe(addr, temp, 775 &net->sctp.local_addr_list, list) { 776 if (addr->a.sa.sa_family == AF_INET && 777 addr->a.v4.sin_addr.s_addr == 778 ifa->ifa_local) { 779 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); 780 found = 1; 781 addr->valid = 0; 782 list_del_rcu(&addr->list); 783 break; 784 } 785 } 786 spin_unlock_bh(&net->sctp.local_addr_lock); 787 if (found) 788 kfree_rcu(addr, rcu); 789 break; 790 } 791 792 return NOTIFY_DONE; 793 } 794 795 /* 796 * Initialize the control inode/socket with a control endpoint data 797 * structure. This endpoint is reserved exclusively for the OOTB processing. 798 */ 799 static int sctp_ctl_sock_init(struct net *net) 800 { 801 int err; 802 sa_family_t family = PF_INET; 803 804 if (sctp_get_pf_specific(PF_INET6)) 805 family = PF_INET6; 806 807 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family, 808 SOCK_SEQPACKET, IPPROTO_SCTP, net); 809 810 /* If IPv6 socket could not be created, try the IPv4 socket */ 811 if (err < 0 && family == PF_INET6) 812 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET, 813 SOCK_SEQPACKET, IPPROTO_SCTP, 814 net); 815 816 if (err < 0) { 817 pr_err("Failed to create the SCTP control socket\n"); 818 return err; 819 } 820 return 0; 821 } 822 823 /* Register address family specific functions. */ 824 int sctp_register_af(struct sctp_af *af) 825 { 826 switch (af->sa_family) { 827 case AF_INET: 828 if (sctp_af_v4_specific) 829 return 0; 830 sctp_af_v4_specific = af; 831 break; 832 case AF_INET6: 833 if (sctp_af_v6_specific) 834 return 0; 835 sctp_af_v6_specific = af; 836 break; 837 default: 838 return 0; 839 } 840 841 INIT_LIST_HEAD(&af->list); 842 list_add_tail(&af->list, &sctp_address_families); 843 return 1; 844 } 845 846 /* Get the table of functions for manipulating a particular address 847 * family. 848 */ 849 struct sctp_af *sctp_get_af_specific(sa_family_t family) 850 { 851 switch (family) { 852 case AF_INET: 853 return sctp_af_v4_specific; 854 case AF_INET6: 855 return sctp_af_v6_specific; 856 default: 857 return NULL; 858 } 859 } 860 861 /* Common code to initialize a AF_INET msg_name. */ 862 static void sctp_inet_msgname(char *msgname, int *addr_len) 863 { 864 struct sockaddr_in *sin; 865 866 sin = (struct sockaddr_in *)msgname; 867 *addr_len = sizeof(struct sockaddr_in); 868 sin->sin_family = AF_INET; 869 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 870 } 871 872 /* Copy the primary address of the peer primary address as the msg_name. */ 873 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 874 int *addr_len) 875 { 876 struct sockaddr_in *sin, *sinfrom; 877 878 if (msgname) { 879 struct sctp_association *asoc; 880 881 asoc = event->asoc; 882 sctp_inet_msgname(msgname, addr_len); 883 sin = (struct sockaddr_in *)msgname; 884 sinfrom = &asoc->peer.primary_addr.v4; 885 sin->sin_port = htons(asoc->peer.port); 886 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 887 } 888 } 889 890 /* Initialize and copy out a msgname from an inbound skb. */ 891 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 892 { 893 if (msgname) { 894 struct sctphdr *sh = sctp_hdr(skb); 895 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 896 897 sctp_inet_msgname(msgname, len); 898 sin->sin_port = sh->source; 899 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 900 } 901 } 902 903 /* Do we support this AF? */ 904 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 905 { 906 /* PF_INET only supports AF_INET addresses. */ 907 return AF_INET == family; 908 } 909 910 /* Address matching with wildcards allowed. */ 911 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 912 const union sctp_addr *addr2, 913 struct sctp_sock *opt) 914 { 915 /* PF_INET only supports AF_INET addresses. */ 916 if (addr1->sa.sa_family != addr2->sa.sa_family) 917 return 0; 918 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 919 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 920 return 1; 921 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 922 return 1; 923 924 return 0; 925 } 926 927 /* Verify that provided sockaddr looks bindable. Common verification has 928 * already been taken care of. 929 */ 930 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 931 { 932 return sctp_v4_available(addr, opt); 933 } 934 935 /* Verify that sockaddr looks sendable. Common verification has already 936 * been taken care of. 937 */ 938 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 939 { 940 return 1; 941 } 942 943 /* Fill in Supported Address Type information for INIT and INIT-ACK 944 * chunks. Returns number of addresses supported. 945 */ 946 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 947 __be16 *types) 948 { 949 types[0] = SCTP_PARAM_IPV4_ADDRESS; 950 return 1; 951 } 952 953 /* Wrapper routine that calls the ip transmit routine. */ 954 static inline int sctp_v4_xmit(struct sk_buff *skb, 955 struct sctp_transport *transport) 956 { 957 struct inet_sock *inet = inet_sk(skb->sk); 958 959 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb, 960 skb->len, &transport->fl.u.ip4.saddr, &transport->fl.u.ip4.daddr); 961 962 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 963 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 964 965 SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS); 966 967 return ip_queue_xmit(skb, &transport->fl); 968 } 969 970 static struct sctp_af sctp_af_inet; 971 972 static struct sctp_pf sctp_pf_inet = { 973 .event_msgname = sctp_inet_event_msgname, 974 .skb_msgname = sctp_inet_skb_msgname, 975 .af_supported = sctp_inet_af_supported, 976 .cmp_addr = sctp_inet_cmp_addr, 977 .bind_verify = sctp_inet_bind_verify, 978 .send_verify = sctp_inet_send_verify, 979 .supported_addrs = sctp_inet_supported_addrs, 980 .create_accept_sk = sctp_v4_create_accept_sk, 981 .addr_v4map = sctp_v4_addr_v4map, 982 .af = &sctp_af_inet 983 }; 984 985 /* Notifier for inetaddr addition/deletion events. */ 986 static struct notifier_block sctp_inetaddr_notifier = { 987 .notifier_call = sctp_inetaddr_event, 988 }; 989 990 /* Socket operations. */ 991 static const struct proto_ops inet_seqpacket_ops = { 992 .family = PF_INET, 993 .owner = THIS_MODULE, 994 .release = inet_release, /* Needs to be wrapped... */ 995 .bind = inet_bind, 996 .connect = inet_dgram_connect, 997 .socketpair = sock_no_socketpair, 998 .accept = inet_accept, 999 .getname = inet_getname, /* Semantics are different. */ 1000 .poll = sctp_poll, 1001 .ioctl = inet_ioctl, 1002 .listen = sctp_inet_listen, 1003 .shutdown = inet_shutdown, /* Looks harmless. */ 1004 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 1005 .getsockopt = sock_common_getsockopt, 1006 .sendmsg = inet_sendmsg, 1007 .recvmsg = sock_common_recvmsg, 1008 .mmap = sock_no_mmap, 1009 .sendpage = sock_no_sendpage, 1010 #ifdef CONFIG_COMPAT 1011 .compat_setsockopt = compat_sock_common_setsockopt, 1012 .compat_getsockopt = compat_sock_common_getsockopt, 1013 #endif 1014 }; 1015 1016 /* Registration with AF_INET family. */ 1017 static struct inet_protosw sctp_seqpacket_protosw = { 1018 .type = SOCK_SEQPACKET, 1019 .protocol = IPPROTO_SCTP, 1020 .prot = &sctp_prot, 1021 .ops = &inet_seqpacket_ops, 1022 .no_check = 0, 1023 .flags = SCTP_PROTOSW_FLAG 1024 }; 1025 static struct inet_protosw sctp_stream_protosw = { 1026 .type = SOCK_STREAM, 1027 .protocol = IPPROTO_SCTP, 1028 .prot = &sctp_prot, 1029 .ops = &inet_seqpacket_ops, 1030 .no_check = 0, 1031 .flags = SCTP_PROTOSW_FLAG 1032 }; 1033 1034 /* Register with IP layer. */ 1035 static const struct net_protocol sctp_protocol = { 1036 .handler = sctp_rcv, 1037 .err_handler = sctp_v4_err, 1038 .no_policy = 1, 1039 .netns_ok = 1, 1040 }; 1041 1042 /* IPv4 address related functions. */ 1043 static struct sctp_af sctp_af_inet = { 1044 .sa_family = AF_INET, 1045 .sctp_xmit = sctp_v4_xmit, 1046 .setsockopt = ip_setsockopt, 1047 .getsockopt = ip_getsockopt, 1048 .get_dst = sctp_v4_get_dst, 1049 .get_saddr = sctp_v4_get_saddr, 1050 .copy_addrlist = sctp_v4_copy_addrlist, 1051 .from_skb = sctp_v4_from_skb, 1052 .from_sk = sctp_v4_from_sk, 1053 .to_sk_saddr = sctp_v4_to_sk_saddr, 1054 .to_sk_daddr = sctp_v4_to_sk_daddr, 1055 .from_addr_param = sctp_v4_from_addr_param, 1056 .to_addr_param = sctp_v4_to_addr_param, 1057 .cmp_addr = sctp_v4_cmp_addr, 1058 .addr_valid = sctp_v4_addr_valid, 1059 .inaddr_any = sctp_v4_inaddr_any, 1060 .is_any = sctp_v4_is_any, 1061 .available = sctp_v4_available, 1062 .scope = sctp_v4_scope, 1063 .skb_iif = sctp_v4_skb_iif, 1064 .is_ce = sctp_v4_is_ce, 1065 .seq_dump_addr = sctp_v4_seq_dump_addr, 1066 .ecn_capable = sctp_v4_ecn_capable, 1067 .net_header_len = sizeof(struct iphdr), 1068 .sockaddr_len = sizeof(struct sockaddr_in), 1069 #ifdef CONFIG_COMPAT 1070 .compat_setsockopt = compat_ip_setsockopt, 1071 .compat_getsockopt = compat_ip_getsockopt, 1072 #endif 1073 }; 1074 1075 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 1076 1077 switch (family) { 1078 case PF_INET: 1079 return sctp_pf_inet_specific; 1080 case PF_INET6: 1081 return sctp_pf_inet6_specific; 1082 default: 1083 return NULL; 1084 } 1085 } 1086 1087 /* Register the PF specific function table. */ 1088 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 1089 { 1090 switch (family) { 1091 case PF_INET: 1092 if (sctp_pf_inet_specific) 1093 return 0; 1094 sctp_pf_inet_specific = pf; 1095 break; 1096 case PF_INET6: 1097 if (sctp_pf_inet6_specific) 1098 return 0; 1099 sctp_pf_inet6_specific = pf; 1100 break; 1101 default: 1102 return 0; 1103 } 1104 return 1; 1105 } 1106 1107 static inline int init_sctp_mibs(struct net *net) 1108 { 1109 return snmp_mib_init((void __percpu **)net->sctp.sctp_statistics, 1110 sizeof(struct sctp_mib), 1111 __alignof__(struct sctp_mib)); 1112 } 1113 1114 static inline void cleanup_sctp_mibs(struct net *net) 1115 { 1116 snmp_mib_free((void __percpu **)net->sctp.sctp_statistics); 1117 } 1118 1119 static void sctp_v4_pf_init(void) 1120 { 1121 /* Initialize the SCTP specific PF functions. */ 1122 sctp_register_pf(&sctp_pf_inet, PF_INET); 1123 sctp_register_af(&sctp_af_inet); 1124 } 1125 1126 static void sctp_v4_pf_exit(void) 1127 { 1128 list_del(&sctp_af_inet.list); 1129 } 1130 1131 static int sctp_v4_protosw_init(void) 1132 { 1133 int rc; 1134 1135 rc = proto_register(&sctp_prot, 1); 1136 if (rc) 1137 return rc; 1138 1139 /* Register SCTP(UDP and TCP style) with socket layer. */ 1140 inet_register_protosw(&sctp_seqpacket_protosw); 1141 inet_register_protosw(&sctp_stream_protosw); 1142 1143 return 0; 1144 } 1145 1146 static void sctp_v4_protosw_exit(void) 1147 { 1148 inet_unregister_protosw(&sctp_stream_protosw); 1149 inet_unregister_protosw(&sctp_seqpacket_protosw); 1150 proto_unregister(&sctp_prot); 1151 } 1152 1153 static int sctp_v4_add_protocol(void) 1154 { 1155 /* Register notifier for inet address additions/deletions. */ 1156 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1157 1158 /* Register SCTP with inet layer. */ 1159 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1160 return -EAGAIN; 1161 1162 return 0; 1163 } 1164 1165 static void sctp_v4_del_protocol(void) 1166 { 1167 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1168 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1169 } 1170 1171 static int __net_init sctp_net_init(struct net *net) 1172 { 1173 int status; 1174 1175 /* 1176 * 14. Suggested SCTP Protocol Parameter Values 1177 */ 1178 /* The following protocol parameters are RECOMMENDED: */ 1179 /* RTO.Initial - 3 seconds */ 1180 net->sctp.rto_initial = SCTP_RTO_INITIAL; 1181 /* RTO.Min - 1 second */ 1182 net->sctp.rto_min = SCTP_RTO_MIN; 1183 /* RTO.Max - 60 seconds */ 1184 net->sctp.rto_max = SCTP_RTO_MAX; 1185 /* RTO.Alpha - 1/8 */ 1186 net->sctp.rto_alpha = SCTP_RTO_ALPHA; 1187 /* RTO.Beta - 1/4 */ 1188 net->sctp.rto_beta = SCTP_RTO_BETA; 1189 1190 /* Valid.Cookie.Life - 60 seconds */ 1191 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1192 1193 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1194 net->sctp.cookie_preserve_enable = 1; 1195 1196 /* Default sctp sockets to use md5 as their hmac alg */ 1197 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5) 1198 net->sctp.sctp_hmac_alg = "md5"; 1199 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1) 1200 net->sctp.sctp_hmac_alg = "sha1"; 1201 #else 1202 net->sctp.sctp_hmac_alg = NULL; 1203 #endif 1204 1205 /* Max.Burst - 4 */ 1206 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST; 1207 1208 /* Association.Max.Retrans - 10 attempts 1209 * Path.Max.Retrans - 5 attempts (per destination address) 1210 * Max.Init.Retransmits - 8 attempts 1211 */ 1212 net->sctp.max_retrans_association = 10; 1213 net->sctp.max_retrans_path = 5; 1214 net->sctp.max_retrans_init = 8; 1215 1216 /* Sendbuffer growth - do per-socket accounting */ 1217 net->sctp.sndbuf_policy = 0; 1218 1219 /* Rcvbuffer growth - do per-socket accounting */ 1220 net->sctp.rcvbuf_policy = 0; 1221 1222 /* HB.interval - 30 seconds */ 1223 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1224 1225 /* delayed SACK timeout */ 1226 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1227 1228 /* Disable ADDIP by default. */ 1229 net->sctp.addip_enable = 0; 1230 net->sctp.addip_noauth = 0; 1231 net->sctp.default_auto_asconf = 0; 1232 1233 /* Enable PR-SCTP by default. */ 1234 net->sctp.prsctp_enable = 1; 1235 1236 /* Disable AUTH by default. */ 1237 net->sctp.auth_enable = 0; 1238 1239 /* Set SCOPE policy to enabled */ 1240 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE; 1241 1242 /* Set the default rwnd update threshold */ 1243 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; 1244 1245 /* Initialize maximum autoclose timeout. */ 1246 net->sctp.max_autoclose = INT_MAX / HZ; 1247 1248 status = sctp_sysctl_net_register(net); 1249 if (status) 1250 goto err_sysctl_register; 1251 1252 /* Allocate and initialise sctp mibs. */ 1253 status = init_sctp_mibs(net); 1254 if (status) 1255 goto err_init_mibs; 1256 1257 /* Initialize proc fs directory. */ 1258 status = sctp_proc_init(net); 1259 if (status) 1260 goto err_init_proc; 1261 1262 sctp_dbg_objcnt_init(net); 1263 1264 /* Initialize the control inode/socket for handling OOTB packets. */ 1265 if ((status = sctp_ctl_sock_init(net))) { 1266 pr_err("Failed to initialize the SCTP control sock\n"); 1267 goto err_ctl_sock_init; 1268 } 1269 1270 /* Initialize the local address list. */ 1271 INIT_LIST_HEAD(&net->sctp.local_addr_list); 1272 spin_lock_init(&net->sctp.local_addr_lock); 1273 sctp_get_local_addr_list(net); 1274 1275 /* Initialize the address event list */ 1276 INIT_LIST_HEAD(&net->sctp.addr_waitq); 1277 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist); 1278 spin_lock_init(&net->sctp.addr_wq_lock); 1279 net->sctp.addr_wq_timer.expires = 0; 1280 setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 1281 (unsigned long)net); 1282 1283 return 0; 1284 1285 err_ctl_sock_init: 1286 sctp_dbg_objcnt_exit(net); 1287 sctp_proc_exit(net); 1288 err_init_proc: 1289 cleanup_sctp_mibs(net); 1290 err_init_mibs: 1291 sctp_sysctl_net_unregister(net); 1292 err_sysctl_register: 1293 return status; 1294 } 1295 1296 static void __net_exit sctp_net_exit(struct net *net) 1297 { 1298 /* Free the local address list */ 1299 sctp_free_addr_wq(net); 1300 sctp_free_local_addr_list(net); 1301 1302 /* Free the control endpoint. */ 1303 inet_ctl_sock_destroy(net->sctp.ctl_sock); 1304 1305 sctp_dbg_objcnt_exit(net); 1306 1307 sctp_proc_exit(net); 1308 cleanup_sctp_mibs(net); 1309 sctp_sysctl_net_unregister(net); 1310 } 1311 1312 static struct pernet_operations sctp_net_ops = { 1313 .init = sctp_net_init, 1314 .exit = sctp_net_exit, 1315 }; 1316 1317 /* Initialize the universe into something sensible. */ 1318 static __init int sctp_init(void) 1319 { 1320 int i; 1321 int status = -EINVAL; 1322 unsigned long goal; 1323 unsigned long limit; 1324 int max_share; 1325 int order; 1326 1327 BUILD_BUG_ON(sizeof(struct sctp_ulpevent) > 1328 sizeof(((struct sk_buff *) 0)->cb)); 1329 1330 /* Allocate bind_bucket and chunk caches. */ 1331 status = -ENOBUFS; 1332 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1333 sizeof(struct sctp_bind_bucket), 1334 0, SLAB_HWCACHE_ALIGN, 1335 NULL); 1336 if (!sctp_bucket_cachep) 1337 goto out; 1338 1339 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1340 sizeof(struct sctp_chunk), 1341 0, SLAB_HWCACHE_ALIGN, 1342 NULL); 1343 if (!sctp_chunk_cachep) 1344 goto err_chunk_cachep; 1345 1346 status = percpu_counter_init(&sctp_sockets_allocated, 0); 1347 if (status) 1348 goto err_percpu_counter_init; 1349 1350 /* Implementation specific variables. */ 1351 1352 /* Initialize default stream count setup information. */ 1353 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1354 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1355 1356 /* Initialize handle used for association ids. */ 1357 idr_init(&sctp_assocs_id); 1358 1359 limit = nr_free_buffer_pages() / 8; 1360 limit = max(limit, 128UL); 1361 sysctl_sctp_mem[0] = limit / 4 * 3; 1362 sysctl_sctp_mem[1] = limit; 1363 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1364 1365 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1366 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1367 max_share = min(4UL*1024*1024, limit); 1368 1369 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1370 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1); 1371 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1372 1373 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1374 sysctl_sctp_wmem[1] = 16*1024; 1375 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1376 1377 /* Size and allocate the association hash table. 1378 * The methodology is similar to that of the tcp hash tables. 1379 */ 1380 if (totalram_pages >= (128 * 1024)) 1381 goal = totalram_pages >> (22 - PAGE_SHIFT); 1382 else 1383 goal = totalram_pages >> (24 - PAGE_SHIFT); 1384 1385 for (order = 0; (1UL << order) < goal; order++) 1386 ; 1387 1388 do { 1389 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1390 sizeof(struct sctp_hashbucket); 1391 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1392 continue; 1393 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1394 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); 1395 } while (!sctp_assoc_hashtable && --order > 0); 1396 if (!sctp_assoc_hashtable) { 1397 pr_err("Failed association hash alloc\n"); 1398 status = -ENOMEM; 1399 goto err_ahash_alloc; 1400 } 1401 for (i = 0; i < sctp_assoc_hashsize; i++) { 1402 rwlock_init(&sctp_assoc_hashtable[i].lock); 1403 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1404 } 1405 1406 /* Allocate and initialize the endpoint hash table. */ 1407 sctp_ep_hashsize = 64; 1408 sctp_ep_hashtable = 1409 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1410 if (!sctp_ep_hashtable) { 1411 pr_err("Failed endpoint_hash alloc\n"); 1412 status = -ENOMEM; 1413 goto err_ehash_alloc; 1414 } 1415 for (i = 0; i < sctp_ep_hashsize; i++) { 1416 rwlock_init(&sctp_ep_hashtable[i].lock); 1417 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1418 } 1419 1420 /* Allocate and initialize the SCTP port hash table. */ 1421 do { 1422 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1423 sizeof(struct sctp_bind_hashbucket); 1424 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1425 continue; 1426 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1427 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); 1428 } while (!sctp_port_hashtable && --order > 0); 1429 if (!sctp_port_hashtable) { 1430 pr_err("Failed bind hash alloc\n"); 1431 status = -ENOMEM; 1432 goto err_bhash_alloc; 1433 } 1434 for (i = 0; i < sctp_port_hashsize; i++) { 1435 spin_lock_init(&sctp_port_hashtable[i].lock); 1436 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1437 } 1438 1439 pr_info("Hash tables configured (established %d bind %d)\n", 1440 sctp_assoc_hashsize, sctp_port_hashsize); 1441 1442 sctp_sysctl_register(); 1443 1444 INIT_LIST_HEAD(&sctp_address_families); 1445 sctp_v4_pf_init(); 1446 sctp_v6_pf_init(); 1447 1448 status = sctp_v4_protosw_init(); 1449 1450 if (status) 1451 goto err_protosw_init; 1452 1453 status = sctp_v6_protosw_init(); 1454 if (status) 1455 goto err_v6_protosw_init; 1456 1457 status = register_pernet_subsys(&sctp_net_ops); 1458 if (status) 1459 goto err_register_pernet_subsys; 1460 1461 status = sctp_v4_add_protocol(); 1462 if (status) 1463 goto err_add_protocol; 1464 1465 /* Register SCTP with inet6 layer. */ 1466 status = sctp_v6_add_protocol(); 1467 if (status) 1468 goto err_v6_add_protocol; 1469 1470 status = 0; 1471 out: 1472 return status; 1473 err_v6_add_protocol: 1474 sctp_v4_del_protocol(); 1475 err_add_protocol: 1476 unregister_pernet_subsys(&sctp_net_ops); 1477 err_register_pernet_subsys: 1478 sctp_v6_protosw_exit(); 1479 err_v6_protosw_init: 1480 sctp_v4_protosw_exit(); 1481 err_protosw_init: 1482 sctp_v4_pf_exit(); 1483 sctp_v6_pf_exit(); 1484 sctp_sysctl_unregister(); 1485 free_pages((unsigned long)sctp_port_hashtable, 1486 get_order(sctp_port_hashsize * 1487 sizeof(struct sctp_bind_hashbucket))); 1488 err_bhash_alloc: 1489 kfree(sctp_ep_hashtable); 1490 err_ehash_alloc: 1491 free_pages((unsigned long)sctp_assoc_hashtable, 1492 get_order(sctp_assoc_hashsize * 1493 sizeof(struct sctp_hashbucket))); 1494 err_ahash_alloc: 1495 percpu_counter_destroy(&sctp_sockets_allocated); 1496 err_percpu_counter_init: 1497 kmem_cache_destroy(sctp_chunk_cachep); 1498 err_chunk_cachep: 1499 kmem_cache_destroy(sctp_bucket_cachep); 1500 goto out; 1501 } 1502 1503 /* Exit handler for the SCTP protocol. */ 1504 static __exit void sctp_exit(void) 1505 { 1506 /* BUG. This should probably do something useful like clean 1507 * up all the remaining associations and all that memory. 1508 */ 1509 1510 /* Unregister with inet6/inet layers. */ 1511 sctp_v6_del_protocol(); 1512 sctp_v4_del_protocol(); 1513 1514 unregister_pernet_subsys(&sctp_net_ops); 1515 1516 /* Free protosw registrations */ 1517 sctp_v6_protosw_exit(); 1518 sctp_v4_protosw_exit(); 1519 1520 /* Unregister with socket layer. */ 1521 sctp_v6_pf_exit(); 1522 sctp_v4_pf_exit(); 1523 1524 sctp_sysctl_unregister(); 1525 1526 free_pages((unsigned long)sctp_assoc_hashtable, 1527 get_order(sctp_assoc_hashsize * 1528 sizeof(struct sctp_hashbucket))); 1529 kfree(sctp_ep_hashtable); 1530 free_pages((unsigned long)sctp_port_hashtable, 1531 get_order(sctp_port_hashsize * 1532 sizeof(struct sctp_bind_hashbucket))); 1533 1534 percpu_counter_destroy(&sctp_sockets_allocated); 1535 1536 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1537 1538 kmem_cache_destroy(sctp_chunk_cachep); 1539 kmem_cache_destroy(sctp_bucket_cachep); 1540 } 1541 1542 module_init(sctp_init); 1543 module_exit(sctp_exit); 1544 1545 /* 1546 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1547 */ 1548 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1549 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1550 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1551 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1552 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1553 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1554 MODULE_LICENSE("GPL"); 1555