1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* SCTP kernel implementation 3 * (C) Copyright IBM Corp. 2001, 2004 4 * Copyright (c) 1999-2000 Cisco, Inc. 5 * Copyright (c) 1999-2001 Motorola, Inc. 6 * Copyright (c) 2001 Intel Corp. 7 * Copyright (c) 2001 Nokia, Inc. 8 * Copyright (c) 2001 La Monte H.P. Yarroll 9 * 10 * This file is part of the SCTP kernel implementation 11 * 12 * Initialization/cleanup for SCTP protocol support. 13 * 14 * Please send any bug reports or fixes you make to the 15 * email address(es): 16 * lksctp developers <linux-sctp@vger.kernel.org> 17 * 18 * Written or modified by: 19 * La Monte H.P. Yarroll <piggy@acm.org> 20 * Karl Knutson <karl@athena.chicago.il.us> 21 * Jon Grimm <jgrimm@us.ibm.com> 22 * Sridhar Samudrala <sri@us.ibm.com> 23 * Daisy Chang <daisyc@us.ibm.com> 24 * Ardelle Fan <ardelle.fan@intel.com> 25 */ 26 27 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 28 29 #include <linux/module.h> 30 #include <linux/init.h> 31 #include <linux/netdevice.h> 32 #include <linux/inetdevice.h> 33 #include <linux/seq_file.h> 34 #include <linux/memblock.h> 35 #include <linux/highmem.h> 36 #include <linux/swap.h> 37 #include <linux/slab.h> 38 #include <net/net_namespace.h> 39 #include <net/protocol.h> 40 #include <net/ip.h> 41 #include <net/ipv6.h> 42 #include <net/route.h> 43 #include <net/sctp/sctp.h> 44 #include <net/addrconf.h> 45 #include <net/inet_common.h> 46 #include <net/inet_ecn.h> 47 #include <net/udp_tunnel.h> 48 49 #define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024) 50 51 /* Global data structures. */ 52 struct sctp_globals sctp_globals __read_mostly; 53 54 struct idr sctp_assocs_id; 55 DEFINE_SPINLOCK(sctp_assocs_id_lock); 56 57 static struct sctp_pf *sctp_pf_inet6_specific; 58 static struct sctp_pf *sctp_pf_inet_specific; 59 static struct sctp_af *sctp_af_v4_specific; 60 static struct sctp_af *sctp_af_v6_specific; 61 62 struct kmem_cache *sctp_chunk_cachep __read_mostly; 63 struct kmem_cache *sctp_bucket_cachep __read_mostly; 64 65 long sysctl_sctp_mem[3]; 66 int sysctl_sctp_rmem[3]; 67 int sysctl_sctp_wmem[3]; 68 69 /* Private helper to extract ipv4 address and stash them in 70 * the protocol structure. 71 */ 72 static void sctp_v4_copy_addrlist(struct list_head *addrlist, 73 struct net_device *dev) 74 { 75 struct in_device *in_dev; 76 struct in_ifaddr *ifa; 77 struct sctp_sockaddr_entry *addr; 78 79 rcu_read_lock(); 80 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 81 rcu_read_unlock(); 82 return; 83 } 84 85 in_dev_for_each_ifa_rcu(ifa, in_dev) { 86 /* Add the address to the local list. */ 87 addr = kzalloc(sizeof(*addr), GFP_ATOMIC); 88 if (addr) { 89 addr->a.v4.sin_family = AF_INET; 90 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 91 addr->valid = 1; 92 INIT_LIST_HEAD(&addr->list); 93 list_add_tail(&addr->list, addrlist); 94 } 95 } 96 97 rcu_read_unlock(); 98 } 99 100 /* Extract our IP addresses from the system and stash them in the 101 * protocol structure. 102 */ 103 static void sctp_get_local_addr_list(struct net *net) 104 { 105 struct net_device *dev; 106 struct list_head *pos; 107 struct sctp_af *af; 108 109 rcu_read_lock(); 110 for_each_netdev_rcu(net, dev) { 111 list_for_each(pos, &sctp_address_families) { 112 af = list_entry(pos, struct sctp_af, list); 113 af->copy_addrlist(&net->sctp.local_addr_list, dev); 114 } 115 } 116 rcu_read_unlock(); 117 } 118 119 /* Free the existing local addresses. */ 120 static void sctp_free_local_addr_list(struct net *net) 121 { 122 struct sctp_sockaddr_entry *addr; 123 struct list_head *pos, *temp; 124 125 list_for_each_safe(pos, temp, &net->sctp.local_addr_list) { 126 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 127 list_del(pos); 128 kfree(addr); 129 } 130 } 131 132 /* Copy the local addresses which are valid for 'scope' into 'bp'. */ 133 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp, 134 enum sctp_scope scope, gfp_t gfp, int copy_flags) 135 { 136 struct sctp_sockaddr_entry *addr; 137 union sctp_addr laddr; 138 int error = 0; 139 140 rcu_read_lock(); 141 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) { 142 if (!addr->valid) 143 continue; 144 if (!sctp_in_scope(net, &addr->a, scope)) 145 continue; 146 147 /* Now that the address is in scope, check to see if 148 * the address type is really supported by the local 149 * sock as well as the remote peer. 150 */ 151 if (addr->a.sa.sa_family == AF_INET && 152 (!(copy_flags & SCTP_ADDR4_ALLOWED) || 153 !(copy_flags & SCTP_ADDR4_PEERSUPP))) 154 continue; 155 if (addr->a.sa.sa_family == AF_INET6 && 156 (!(copy_flags & SCTP_ADDR6_ALLOWED) || 157 !(copy_flags & SCTP_ADDR6_PEERSUPP))) 158 continue; 159 160 laddr = addr->a; 161 /* also works for setting ipv6 address port */ 162 laddr.v4.sin_port = htons(bp->port); 163 if (sctp_bind_addr_state(bp, &laddr) != -1) 164 continue; 165 166 error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a), 167 SCTP_ADDR_SRC, GFP_ATOMIC); 168 if (error) 169 break; 170 } 171 172 rcu_read_unlock(); 173 return error; 174 } 175 176 /* Copy over any ip options */ 177 static void sctp_v4_copy_ip_options(struct sock *sk, struct sock *newsk) 178 { 179 struct inet_sock *newinet, *inet = inet_sk(sk); 180 struct ip_options_rcu *inet_opt, *newopt = NULL; 181 182 newinet = inet_sk(newsk); 183 184 rcu_read_lock(); 185 inet_opt = rcu_dereference(inet->inet_opt); 186 if (inet_opt) { 187 newopt = sock_kmalloc(newsk, sizeof(*inet_opt) + 188 inet_opt->opt.optlen, GFP_ATOMIC); 189 if (newopt) 190 memcpy(newopt, inet_opt, sizeof(*inet_opt) + 191 inet_opt->opt.optlen); 192 else 193 pr_err("%s: Failed to copy ip options\n", __func__); 194 } 195 RCU_INIT_POINTER(newinet->inet_opt, newopt); 196 rcu_read_unlock(); 197 } 198 199 /* Account for the IP options */ 200 static int sctp_v4_ip_options_len(struct sock *sk) 201 { 202 struct inet_sock *inet = inet_sk(sk); 203 struct ip_options_rcu *inet_opt; 204 int len = 0; 205 206 rcu_read_lock(); 207 inet_opt = rcu_dereference(inet->inet_opt); 208 if (inet_opt) 209 len = inet_opt->opt.optlen; 210 211 rcu_read_unlock(); 212 return len; 213 } 214 215 /* Initialize a sctp_addr from in incoming skb. */ 216 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 217 int is_saddr) 218 { 219 /* Always called on head skb, so this is safe */ 220 struct sctphdr *sh = sctp_hdr(skb); 221 struct sockaddr_in *sa = &addr->v4; 222 223 addr->v4.sin_family = AF_INET; 224 225 if (is_saddr) { 226 sa->sin_port = sh->source; 227 sa->sin_addr.s_addr = ip_hdr(skb)->saddr; 228 } else { 229 sa->sin_port = sh->dest; 230 sa->sin_addr.s_addr = ip_hdr(skb)->daddr; 231 } 232 memset(sa->sin_zero, 0, sizeof(sa->sin_zero)); 233 } 234 235 /* Initialize an sctp_addr from a socket. */ 236 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 237 { 238 addr->v4.sin_family = AF_INET; 239 addr->v4.sin_port = 0; 240 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; 241 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); 242 } 243 244 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 245 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 246 { 247 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; 248 } 249 250 /* Initialize sk->sk_daddr from sctp_addr. */ 251 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 252 { 253 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; 254 } 255 256 /* Initialize a sctp_addr from an address parameter. */ 257 static bool sctp_v4_from_addr_param(union sctp_addr *addr, 258 union sctp_addr_param *param, 259 __be16 port, int iif) 260 { 261 if (ntohs(param->v4.param_hdr.length) < sizeof(struct sctp_ipv4addr_param)) 262 return false; 263 264 addr->v4.sin_family = AF_INET; 265 addr->v4.sin_port = port; 266 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 267 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); 268 269 return true; 270 } 271 272 /* Initialize an address parameter from a sctp_addr and return the length 273 * of the address parameter. 274 */ 275 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 276 union sctp_addr_param *param) 277 { 278 int length = sizeof(struct sctp_ipv4addr_param); 279 280 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 281 param->v4.param_hdr.length = htons(length); 282 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 283 284 return length; 285 } 286 287 /* Initialize a sctp_addr from a dst_entry. */ 288 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4, 289 __be16 port) 290 { 291 saddr->v4.sin_family = AF_INET; 292 saddr->v4.sin_port = port; 293 saddr->v4.sin_addr.s_addr = fl4->saddr; 294 memset(saddr->v4.sin_zero, 0, sizeof(saddr->v4.sin_zero)); 295 } 296 297 /* Compare two addresses exactly. */ 298 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 299 const union sctp_addr *addr2) 300 { 301 if (addr1->sa.sa_family != addr2->sa.sa_family) 302 return 0; 303 if (addr1->v4.sin_port != addr2->v4.sin_port) 304 return 0; 305 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 306 return 0; 307 308 return 1; 309 } 310 311 /* Initialize addr struct to INADDR_ANY. */ 312 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 313 { 314 addr->v4.sin_family = AF_INET; 315 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 316 addr->v4.sin_port = port; 317 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); 318 } 319 320 /* Is this a wildcard address? */ 321 static int sctp_v4_is_any(const union sctp_addr *addr) 322 { 323 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 324 } 325 326 /* This function checks if the address is a valid address to be used for 327 * SCTP binding. 328 * 329 * Output: 330 * Return 0 - If the address is a non-unicast or an illegal address. 331 * Return 1 - If the address is a unicast. 332 */ 333 static int sctp_v4_addr_valid(union sctp_addr *addr, 334 struct sctp_sock *sp, 335 const struct sk_buff *skb) 336 { 337 /* IPv4 addresses not allowed */ 338 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 339 return 0; 340 341 /* Is this a non-unicast address or a unusable SCTP address? */ 342 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 343 return 0; 344 345 /* Is this a broadcast address? */ 346 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) 347 return 0; 348 349 return 1; 350 } 351 352 /* Should this be available for binding? */ 353 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 354 { 355 struct net *net = sock_net(&sp->inet.sk); 356 int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr); 357 358 359 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 360 ret != RTN_LOCAL && 361 !sp->inet.freebind && 362 !net->ipv4.sysctl_ip_nonlocal_bind) 363 return 0; 364 365 if (ipv6_only_sock(sctp_opt2sk(sp))) 366 return 0; 367 368 return 1; 369 } 370 371 /* Checking the loopback, private and other address scopes as defined in 372 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 373 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 374 * 375 * Level 0 - unusable SCTP addresses 376 * Level 1 - loopback address 377 * Level 2 - link-local addresses 378 * Level 3 - private addresses. 379 * Level 4 - global addresses 380 * For INIT and INIT-ACK address list, let L be the level of 381 * requested destination address, sender and receiver 382 * SHOULD include all of its addresses with level greater 383 * than or equal to L. 384 * 385 * IPv4 scoping can be controlled through sysctl option 386 * net.sctp.addr_scope_policy 387 */ 388 static enum sctp_scope sctp_v4_scope(union sctp_addr *addr) 389 { 390 enum sctp_scope retval; 391 392 /* Check for unusable SCTP addresses. */ 393 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 394 retval = SCTP_SCOPE_UNUSABLE; 395 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 396 retval = SCTP_SCOPE_LOOPBACK; 397 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 398 retval = SCTP_SCOPE_LINK; 399 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 400 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 401 ipv4_is_private_192(addr->v4.sin_addr.s_addr) || 402 ipv4_is_test_198(addr->v4.sin_addr.s_addr)) { 403 retval = SCTP_SCOPE_PRIVATE; 404 } else { 405 retval = SCTP_SCOPE_GLOBAL; 406 } 407 408 return retval; 409 } 410 411 /* Returns a valid dst cache entry for the given source and destination ip 412 * addresses. If an association is passed, trys to get a dst entry with a 413 * source address that matches an address in the bind address list. 414 */ 415 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr, 416 struct flowi *fl, struct sock *sk) 417 { 418 struct sctp_association *asoc = t->asoc; 419 struct rtable *rt; 420 struct flowi _fl; 421 struct flowi4 *fl4 = &_fl.u.ip4; 422 struct sctp_bind_addr *bp; 423 struct sctp_sockaddr_entry *laddr; 424 struct dst_entry *dst = NULL; 425 union sctp_addr *daddr = &t->ipaddr; 426 union sctp_addr dst_saddr; 427 __u8 tos = inet_sk(sk)->tos; 428 429 if (t->dscp & SCTP_DSCP_SET_MASK) 430 tos = t->dscp & SCTP_DSCP_VAL_MASK; 431 memset(&_fl, 0x0, sizeof(_fl)); 432 fl4->daddr = daddr->v4.sin_addr.s_addr; 433 fl4->fl4_dport = daddr->v4.sin_port; 434 fl4->flowi4_proto = IPPROTO_SCTP; 435 if (asoc) { 436 fl4->flowi4_tos = RT_CONN_FLAGS_TOS(asoc->base.sk, tos); 437 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if; 438 fl4->fl4_sport = htons(asoc->base.bind_addr.port); 439 } 440 if (saddr) { 441 fl4->saddr = saddr->v4.sin_addr.s_addr; 442 if (!fl4->fl4_sport) 443 fl4->fl4_sport = saddr->v4.sin_port; 444 } 445 446 pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr, 447 &fl4->saddr); 448 449 rt = ip_route_output_key(sock_net(sk), fl4); 450 if (!IS_ERR(rt)) { 451 dst = &rt->dst; 452 t->dst = dst; 453 memcpy(fl, &_fl, sizeof(_fl)); 454 } 455 456 /* If there is no association or if a source address is passed, no 457 * more validation is required. 458 */ 459 if (!asoc || saddr) 460 goto out; 461 462 bp = &asoc->base.bind_addr; 463 464 if (dst) { 465 /* Walk through the bind address list and look for a bind 466 * address that matches the source address of the returned dst. 467 */ 468 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port)); 469 rcu_read_lock(); 470 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 471 if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) || 472 (laddr->state != SCTP_ADDR_SRC && 473 !asoc->src_out_of_asoc_ok)) 474 continue; 475 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 476 goto out_unlock; 477 } 478 rcu_read_unlock(); 479 480 /* None of the bound addresses match the source address of the 481 * dst. So release it. 482 */ 483 dst_release(dst); 484 dst = NULL; 485 } 486 487 /* Walk through the bind address list and try to get a dst that 488 * matches a bind address as the source address. 489 */ 490 rcu_read_lock(); 491 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 492 struct net_device *odev; 493 494 if (!laddr->valid) 495 continue; 496 if (laddr->state != SCTP_ADDR_SRC || 497 AF_INET != laddr->a.sa.sa_family) 498 continue; 499 500 fl4->fl4_sport = laddr->a.v4.sin_port; 501 flowi4_update_output(fl4, 502 asoc->base.sk->sk_bound_dev_if, 503 RT_CONN_FLAGS_TOS(asoc->base.sk, tos), 504 daddr->v4.sin_addr.s_addr, 505 laddr->a.v4.sin_addr.s_addr); 506 507 rt = ip_route_output_key(sock_net(sk), fl4); 508 if (IS_ERR(rt)) 509 continue; 510 511 /* Ensure the src address belongs to the output 512 * interface. 513 */ 514 odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr, 515 false); 516 if (!odev || odev->ifindex != fl4->flowi4_oif) { 517 if (!dst) { 518 dst = &rt->dst; 519 t->dst = dst; 520 memcpy(fl, &_fl, sizeof(_fl)); 521 } else { 522 dst_release(&rt->dst); 523 } 524 continue; 525 } 526 527 dst_release(dst); 528 dst = &rt->dst; 529 t->dst = dst; 530 memcpy(fl, &_fl, sizeof(_fl)); 531 break; 532 } 533 534 out_unlock: 535 rcu_read_unlock(); 536 out: 537 if (dst) { 538 pr_debug("rt_dst:%pI4, rt_src:%pI4\n", 539 &fl->u.ip4.daddr, &fl->u.ip4.saddr); 540 } else { 541 t->dst = NULL; 542 pr_debug("no route\n"); 543 } 544 } 545 546 /* For v4, the source address is cached in the route entry(dst). So no need 547 * to cache it separately and hence this is an empty routine. 548 */ 549 static void sctp_v4_get_saddr(struct sctp_sock *sk, 550 struct sctp_transport *t, 551 struct flowi *fl) 552 { 553 union sctp_addr *saddr = &t->saddr; 554 struct rtable *rt = (struct rtable *)t->dst; 555 556 if (rt) { 557 saddr->v4.sin_family = AF_INET; 558 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; 559 } 560 } 561 562 /* What interface did this skb arrive on? */ 563 static int sctp_v4_skb_iif(const struct sk_buff *skb) 564 { 565 return inet_iif(skb); 566 } 567 568 /* Was this packet marked by Explicit Congestion Notification? */ 569 static int sctp_v4_is_ce(const struct sk_buff *skb) 570 { 571 return INET_ECN_is_ce(ip_hdr(skb)->tos); 572 } 573 574 /* Create and initialize a new sk for the socket returned by accept(). */ 575 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 576 struct sctp_association *asoc, 577 bool kern) 578 { 579 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 580 sk->sk_prot, kern); 581 struct inet_sock *newinet; 582 583 if (!newsk) 584 goto out; 585 586 sock_init_data(NULL, newsk); 587 588 sctp_copy_sock(newsk, sk, asoc); 589 sock_reset_flag(newsk, SOCK_ZAPPED); 590 591 sctp_v4_copy_ip_options(sk, newsk); 592 593 newinet = inet_sk(newsk); 594 595 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 596 597 sk_refcnt_debug_inc(newsk); 598 599 if (newsk->sk_prot->init(newsk)) { 600 sk_common_release(newsk); 601 newsk = NULL; 602 } 603 604 out: 605 return newsk; 606 } 607 608 static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr) 609 { 610 /* No address mapping for V4 sockets */ 611 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); 612 return sizeof(struct sockaddr_in); 613 } 614 615 /* Dump the v4 addr to the seq file. */ 616 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 617 { 618 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 619 } 620 621 static void sctp_v4_ecn_capable(struct sock *sk) 622 { 623 INET_ECN_xmit(sk); 624 } 625 626 static void sctp_addr_wq_timeout_handler(struct timer_list *t) 627 { 628 struct net *net = from_timer(net, t, sctp.addr_wq_timer); 629 struct sctp_sockaddr_entry *addrw, *temp; 630 struct sctp_sock *sp; 631 632 spin_lock_bh(&net->sctp.addr_wq_lock); 633 634 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { 635 pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at " 636 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa, 637 addrw->state, addrw); 638 639 #if IS_ENABLED(CONFIG_IPV6) 640 /* Now we send an ASCONF for each association */ 641 /* Note. we currently don't handle link local IPv6 addressees */ 642 if (addrw->a.sa.sa_family == AF_INET6) { 643 struct in6_addr *in6; 644 645 if (ipv6_addr_type(&addrw->a.v6.sin6_addr) & 646 IPV6_ADDR_LINKLOCAL) 647 goto free_next; 648 649 in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr; 650 if (ipv6_chk_addr(net, in6, NULL, 0) == 0 && 651 addrw->state == SCTP_ADDR_NEW) { 652 unsigned long timeo_val; 653 654 pr_debug("%s: this is on DAD, trying %d sec " 655 "later\n", __func__, 656 SCTP_ADDRESS_TICK_DELAY); 657 658 timeo_val = jiffies; 659 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 660 mod_timer(&net->sctp.addr_wq_timer, timeo_val); 661 break; 662 } 663 } 664 #endif 665 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) { 666 struct sock *sk; 667 668 sk = sctp_opt2sk(sp); 669 /* ignore bound-specific endpoints */ 670 if (!sctp_is_ep_boundall(sk)) 671 continue; 672 bh_lock_sock(sk); 673 if (sctp_asconf_mgmt(sp, addrw) < 0) 674 pr_debug("%s: sctp_asconf_mgmt failed\n", __func__); 675 bh_unlock_sock(sk); 676 } 677 #if IS_ENABLED(CONFIG_IPV6) 678 free_next: 679 #endif 680 list_del(&addrw->list); 681 kfree(addrw); 682 } 683 spin_unlock_bh(&net->sctp.addr_wq_lock); 684 } 685 686 static void sctp_free_addr_wq(struct net *net) 687 { 688 struct sctp_sockaddr_entry *addrw; 689 struct sctp_sockaddr_entry *temp; 690 691 spin_lock_bh(&net->sctp.addr_wq_lock); 692 del_timer(&net->sctp.addr_wq_timer); 693 list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) { 694 list_del(&addrw->list); 695 kfree(addrw); 696 } 697 spin_unlock_bh(&net->sctp.addr_wq_lock); 698 } 699 700 /* lookup the entry for the same address in the addr_waitq 701 * sctp_addr_wq MUST be locked 702 */ 703 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net, 704 struct sctp_sockaddr_entry *addr) 705 { 706 struct sctp_sockaddr_entry *addrw; 707 708 list_for_each_entry(addrw, &net->sctp.addr_waitq, list) { 709 if (addrw->a.sa.sa_family != addr->a.sa.sa_family) 710 continue; 711 if (addrw->a.sa.sa_family == AF_INET) { 712 if (addrw->a.v4.sin_addr.s_addr == 713 addr->a.v4.sin_addr.s_addr) 714 return addrw; 715 } else if (addrw->a.sa.sa_family == AF_INET6) { 716 if (ipv6_addr_equal(&addrw->a.v6.sin6_addr, 717 &addr->a.v6.sin6_addr)) 718 return addrw; 719 } 720 } 721 return NULL; 722 } 723 724 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd) 725 { 726 struct sctp_sockaddr_entry *addrw; 727 unsigned long timeo_val; 728 729 /* first, we check if an opposite message already exist in the queue. 730 * If we found such message, it is removed. 731 * This operation is a bit stupid, but the DHCP client attaches the 732 * new address after a couple of addition and deletion of that address 733 */ 734 735 spin_lock_bh(&net->sctp.addr_wq_lock); 736 /* Offsets existing events in addr_wq */ 737 addrw = sctp_addr_wq_lookup(net, addr); 738 if (addrw) { 739 if (addrw->state != cmd) { 740 pr_debug("%s: offsets existing entry for %d, addr:%pISc " 741 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa, 742 &net->sctp.addr_waitq); 743 744 list_del(&addrw->list); 745 kfree(addrw); 746 } 747 spin_unlock_bh(&net->sctp.addr_wq_lock); 748 return; 749 } 750 751 /* OK, we have to add the new address to the wait queue */ 752 addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 753 if (addrw == NULL) { 754 spin_unlock_bh(&net->sctp.addr_wq_lock); 755 return; 756 } 757 addrw->state = cmd; 758 list_add_tail(&addrw->list, &net->sctp.addr_waitq); 759 760 pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n", 761 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq); 762 763 if (!timer_pending(&net->sctp.addr_wq_timer)) { 764 timeo_val = jiffies; 765 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY); 766 mod_timer(&net->sctp.addr_wq_timer, timeo_val); 767 } 768 spin_unlock_bh(&net->sctp.addr_wq_lock); 769 } 770 771 /* Event handler for inet address addition/deletion events. 772 * The sctp_local_addr_list needs to be protocted by a spin lock since 773 * multiple notifiers (say IPv4 and IPv6) may be running at the same 774 * time and thus corrupt the list. 775 * The reader side is protected with RCU. 776 */ 777 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 778 void *ptr) 779 { 780 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 781 struct sctp_sockaddr_entry *addr = NULL; 782 struct sctp_sockaddr_entry *temp; 783 struct net *net = dev_net(ifa->ifa_dev->dev); 784 int found = 0; 785 786 switch (ev) { 787 case NETDEV_UP: 788 addr = kzalloc(sizeof(*addr), GFP_ATOMIC); 789 if (addr) { 790 addr->a.v4.sin_family = AF_INET; 791 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 792 addr->valid = 1; 793 spin_lock_bh(&net->sctp.local_addr_lock); 794 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); 795 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); 796 spin_unlock_bh(&net->sctp.local_addr_lock); 797 } 798 break; 799 case NETDEV_DOWN: 800 spin_lock_bh(&net->sctp.local_addr_lock); 801 list_for_each_entry_safe(addr, temp, 802 &net->sctp.local_addr_list, list) { 803 if (addr->a.sa.sa_family == AF_INET && 804 addr->a.v4.sin_addr.s_addr == 805 ifa->ifa_local) { 806 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); 807 found = 1; 808 addr->valid = 0; 809 list_del_rcu(&addr->list); 810 break; 811 } 812 } 813 spin_unlock_bh(&net->sctp.local_addr_lock); 814 if (found) 815 kfree_rcu(addr, rcu); 816 break; 817 } 818 819 return NOTIFY_DONE; 820 } 821 822 /* 823 * Initialize the control inode/socket with a control endpoint data 824 * structure. This endpoint is reserved exclusively for the OOTB processing. 825 */ 826 static int sctp_ctl_sock_init(struct net *net) 827 { 828 int err; 829 sa_family_t family = PF_INET; 830 831 if (sctp_get_pf_specific(PF_INET6)) 832 family = PF_INET6; 833 834 err = inet_ctl_sock_create(&net->sctp.ctl_sock, family, 835 SOCK_SEQPACKET, IPPROTO_SCTP, net); 836 837 /* If IPv6 socket could not be created, try the IPv4 socket */ 838 if (err < 0 && family == PF_INET6) 839 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET, 840 SOCK_SEQPACKET, IPPROTO_SCTP, 841 net); 842 843 if (err < 0) { 844 pr_err("Failed to create the SCTP control socket\n"); 845 return err; 846 } 847 return 0; 848 } 849 850 static int sctp_udp_rcv(struct sock *sk, struct sk_buff *skb) 851 { 852 SCTP_INPUT_CB(skb)->encap_port = udp_hdr(skb)->source; 853 854 skb_set_transport_header(skb, sizeof(struct udphdr)); 855 sctp_rcv(skb); 856 return 0; 857 } 858 859 int sctp_udp_sock_start(struct net *net) 860 { 861 struct udp_tunnel_sock_cfg tuncfg = {NULL}; 862 struct udp_port_cfg udp_conf = {0}; 863 struct socket *sock; 864 int err; 865 866 udp_conf.family = AF_INET; 867 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 868 udp_conf.local_udp_port = htons(net->sctp.udp_port); 869 err = udp_sock_create(net, &udp_conf, &sock); 870 if (err) { 871 pr_err("Failed to create the SCTP UDP tunneling v4 sock\n"); 872 return err; 873 } 874 875 tuncfg.encap_type = 1; 876 tuncfg.encap_rcv = sctp_udp_rcv; 877 tuncfg.encap_err_lookup = sctp_udp_v4_err; 878 setup_udp_tunnel_sock(net, sock, &tuncfg); 879 net->sctp.udp4_sock = sock->sk; 880 881 #if IS_ENABLED(CONFIG_IPV6) 882 memset(&udp_conf, 0, sizeof(udp_conf)); 883 884 udp_conf.family = AF_INET6; 885 udp_conf.local_ip6 = in6addr_any; 886 udp_conf.local_udp_port = htons(net->sctp.udp_port); 887 udp_conf.use_udp6_rx_checksums = true; 888 udp_conf.ipv6_v6only = true; 889 err = udp_sock_create(net, &udp_conf, &sock); 890 if (err) { 891 pr_err("Failed to create the SCTP UDP tunneling v6 sock\n"); 892 udp_tunnel_sock_release(net->sctp.udp4_sock->sk_socket); 893 net->sctp.udp4_sock = NULL; 894 return err; 895 } 896 897 tuncfg.encap_type = 1; 898 tuncfg.encap_rcv = sctp_udp_rcv; 899 tuncfg.encap_err_lookup = sctp_udp_v6_err; 900 setup_udp_tunnel_sock(net, sock, &tuncfg); 901 net->sctp.udp6_sock = sock->sk; 902 #endif 903 904 return 0; 905 } 906 907 void sctp_udp_sock_stop(struct net *net) 908 { 909 if (net->sctp.udp4_sock) { 910 udp_tunnel_sock_release(net->sctp.udp4_sock->sk_socket); 911 net->sctp.udp4_sock = NULL; 912 } 913 if (net->sctp.udp6_sock) { 914 udp_tunnel_sock_release(net->sctp.udp6_sock->sk_socket); 915 net->sctp.udp6_sock = NULL; 916 } 917 } 918 919 /* Register address family specific functions. */ 920 int sctp_register_af(struct sctp_af *af) 921 { 922 switch (af->sa_family) { 923 case AF_INET: 924 if (sctp_af_v4_specific) 925 return 0; 926 sctp_af_v4_specific = af; 927 break; 928 case AF_INET6: 929 if (sctp_af_v6_specific) 930 return 0; 931 sctp_af_v6_specific = af; 932 break; 933 default: 934 return 0; 935 } 936 937 INIT_LIST_HEAD(&af->list); 938 list_add_tail(&af->list, &sctp_address_families); 939 return 1; 940 } 941 942 /* Get the table of functions for manipulating a particular address 943 * family. 944 */ 945 struct sctp_af *sctp_get_af_specific(sa_family_t family) 946 { 947 switch (family) { 948 case AF_INET: 949 return sctp_af_v4_specific; 950 case AF_INET6: 951 return sctp_af_v6_specific; 952 default: 953 return NULL; 954 } 955 } 956 957 /* Common code to initialize a AF_INET msg_name. */ 958 static void sctp_inet_msgname(char *msgname, int *addr_len) 959 { 960 struct sockaddr_in *sin; 961 962 sin = (struct sockaddr_in *)msgname; 963 *addr_len = sizeof(struct sockaddr_in); 964 sin->sin_family = AF_INET; 965 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 966 } 967 968 /* Copy the primary address of the peer primary address as the msg_name. */ 969 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 970 int *addr_len) 971 { 972 struct sockaddr_in *sin, *sinfrom; 973 974 if (msgname) { 975 struct sctp_association *asoc; 976 977 asoc = event->asoc; 978 sctp_inet_msgname(msgname, addr_len); 979 sin = (struct sockaddr_in *)msgname; 980 sinfrom = &asoc->peer.primary_addr.v4; 981 sin->sin_port = htons(asoc->peer.port); 982 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 983 } 984 } 985 986 /* Initialize and copy out a msgname from an inbound skb. */ 987 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 988 { 989 if (msgname) { 990 struct sctphdr *sh = sctp_hdr(skb); 991 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 992 993 sctp_inet_msgname(msgname, len); 994 sin->sin_port = sh->source; 995 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 996 } 997 } 998 999 /* Do we support this AF? */ 1000 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 1001 { 1002 /* PF_INET only supports AF_INET addresses. */ 1003 return AF_INET == family; 1004 } 1005 1006 /* Address matching with wildcards allowed. */ 1007 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 1008 const union sctp_addr *addr2, 1009 struct sctp_sock *opt) 1010 { 1011 /* PF_INET only supports AF_INET addresses. */ 1012 if (addr1->sa.sa_family != addr2->sa.sa_family) 1013 return 0; 1014 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 1015 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 1016 return 1; 1017 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 1018 return 1; 1019 1020 return 0; 1021 } 1022 1023 /* Verify that provided sockaddr looks bindable. Common verification has 1024 * already been taken care of. 1025 */ 1026 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 1027 { 1028 return sctp_v4_available(addr, opt); 1029 } 1030 1031 /* Verify that sockaddr looks sendable. Common verification has already 1032 * been taken care of. 1033 */ 1034 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 1035 { 1036 return 1; 1037 } 1038 1039 /* Fill in Supported Address Type information for INIT and INIT-ACK 1040 * chunks. Returns number of addresses supported. 1041 */ 1042 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 1043 __be16 *types) 1044 { 1045 types[0] = SCTP_PARAM_IPV4_ADDRESS; 1046 return 1; 1047 } 1048 1049 /* Wrapper routine that calls the ip transmit routine. */ 1050 static inline int sctp_v4_xmit(struct sk_buff *skb, struct sctp_transport *t) 1051 { 1052 struct dst_entry *dst = dst_clone(t->dst); 1053 struct flowi4 *fl4 = &t->fl.u.ip4; 1054 struct sock *sk = skb->sk; 1055 struct inet_sock *inet = inet_sk(sk); 1056 __u8 dscp = inet->tos; 1057 __be16 df = 0; 1058 1059 pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb, 1060 skb->len, &fl4->saddr, &fl4->daddr); 1061 1062 if (t->dscp & SCTP_DSCP_SET_MASK) 1063 dscp = t->dscp & SCTP_DSCP_VAL_MASK; 1064 1065 inet->pmtudisc = t->param_flags & SPP_PMTUD_ENABLE ? IP_PMTUDISC_DO 1066 : IP_PMTUDISC_DONT; 1067 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS); 1068 1069 if (!t->encap_port || !sctp_sk(sk)->udp_port) { 1070 skb_dst_set(skb, dst); 1071 return __ip_queue_xmit(sk, skb, &t->fl, dscp); 1072 } 1073 1074 if (skb_is_gso(skb)) 1075 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM; 1076 1077 if (ip_dont_fragment(sk, dst) && !skb->ignore_df) 1078 df = htons(IP_DF); 1079 1080 skb->encapsulation = 1; 1081 skb_reset_inner_mac_header(skb); 1082 skb_reset_inner_transport_header(skb); 1083 skb_set_inner_ipproto(skb, IPPROTO_SCTP); 1084 udp_tunnel_xmit_skb((struct rtable *)dst, sk, skb, fl4->saddr, 1085 fl4->daddr, dscp, ip4_dst_hoplimit(dst), df, 1086 sctp_sk(sk)->udp_port, t->encap_port, false, false); 1087 return 0; 1088 } 1089 1090 static struct sctp_af sctp_af_inet; 1091 1092 static struct sctp_pf sctp_pf_inet = { 1093 .event_msgname = sctp_inet_event_msgname, 1094 .skb_msgname = sctp_inet_skb_msgname, 1095 .af_supported = sctp_inet_af_supported, 1096 .cmp_addr = sctp_inet_cmp_addr, 1097 .bind_verify = sctp_inet_bind_verify, 1098 .send_verify = sctp_inet_send_verify, 1099 .supported_addrs = sctp_inet_supported_addrs, 1100 .create_accept_sk = sctp_v4_create_accept_sk, 1101 .addr_to_user = sctp_v4_addr_to_user, 1102 .to_sk_saddr = sctp_v4_to_sk_saddr, 1103 .to_sk_daddr = sctp_v4_to_sk_daddr, 1104 .copy_ip_options = sctp_v4_copy_ip_options, 1105 .af = &sctp_af_inet 1106 }; 1107 1108 /* Notifier for inetaddr addition/deletion events. */ 1109 static struct notifier_block sctp_inetaddr_notifier = { 1110 .notifier_call = sctp_inetaddr_event, 1111 }; 1112 1113 /* Socket operations. */ 1114 static const struct proto_ops inet_seqpacket_ops = { 1115 .family = PF_INET, 1116 .owner = THIS_MODULE, 1117 .release = inet_release, /* Needs to be wrapped... */ 1118 .bind = inet_bind, 1119 .connect = sctp_inet_connect, 1120 .socketpair = sock_no_socketpair, 1121 .accept = inet_accept, 1122 .getname = inet_getname, /* Semantics are different. */ 1123 .poll = sctp_poll, 1124 .ioctl = inet_ioctl, 1125 .gettstamp = sock_gettstamp, 1126 .listen = sctp_inet_listen, 1127 .shutdown = inet_shutdown, /* Looks harmless. */ 1128 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 1129 .getsockopt = sock_common_getsockopt, 1130 .sendmsg = inet_sendmsg, 1131 .recvmsg = inet_recvmsg, 1132 .mmap = sock_no_mmap, 1133 .sendpage = sock_no_sendpage, 1134 }; 1135 1136 /* Registration with AF_INET family. */ 1137 static struct inet_protosw sctp_seqpacket_protosw = { 1138 .type = SOCK_SEQPACKET, 1139 .protocol = IPPROTO_SCTP, 1140 .prot = &sctp_prot, 1141 .ops = &inet_seqpacket_ops, 1142 .flags = SCTP_PROTOSW_FLAG 1143 }; 1144 static struct inet_protosw sctp_stream_protosw = { 1145 .type = SOCK_STREAM, 1146 .protocol = IPPROTO_SCTP, 1147 .prot = &sctp_prot, 1148 .ops = &inet_seqpacket_ops, 1149 .flags = SCTP_PROTOSW_FLAG 1150 }; 1151 1152 static int sctp4_rcv(struct sk_buff *skb) 1153 { 1154 SCTP_INPUT_CB(skb)->encap_port = 0; 1155 return sctp_rcv(skb); 1156 } 1157 1158 /* Register with IP layer. */ 1159 static const struct net_protocol sctp_protocol = { 1160 .handler = sctp4_rcv, 1161 .err_handler = sctp_v4_err, 1162 .no_policy = 1, 1163 .icmp_strict_tag_validation = 1, 1164 }; 1165 1166 /* IPv4 address related functions. */ 1167 static struct sctp_af sctp_af_inet = { 1168 .sa_family = AF_INET, 1169 .sctp_xmit = sctp_v4_xmit, 1170 .setsockopt = ip_setsockopt, 1171 .getsockopt = ip_getsockopt, 1172 .get_dst = sctp_v4_get_dst, 1173 .get_saddr = sctp_v4_get_saddr, 1174 .copy_addrlist = sctp_v4_copy_addrlist, 1175 .from_skb = sctp_v4_from_skb, 1176 .from_sk = sctp_v4_from_sk, 1177 .from_addr_param = sctp_v4_from_addr_param, 1178 .to_addr_param = sctp_v4_to_addr_param, 1179 .cmp_addr = sctp_v4_cmp_addr, 1180 .addr_valid = sctp_v4_addr_valid, 1181 .inaddr_any = sctp_v4_inaddr_any, 1182 .is_any = sctp_v4_is_any, 1183 .available = sctp_v4_available, 1184 .scope = sctp_v4_scope, 1185 .skb_iif = sctp_v4_skb_iif, 1186 .is_ce = sctp_v4_is_ce, 1187 .seq_dump_addr = sctp_v4_seq_dump_addr, 1188 .ecn_capable = sctp_v4_ecn_capable, 1189 .net_header_len = sizeof(struct iphdr), 1190 .sockaddr_len = sizeof(struct sockaddr_in), 1191 .ip_options_len = sctp_v4_ip_options_len, 1192 }; 1193 1194 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) 1195 { 1196 switch (family) { 1197 case PF_INET: 1198 return sctp_pf_inet_specific; 1199 case PF_INET6: 1200 return sctp_pf_inet6_specific; 1201 default: 1202 return NULL; 1203 } 1204 } 1205 1206 /* Register the PF specific function table. */ 1207 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 1208 { 1209 switch (family) { 1210 case PF_INET: 1211 if (sctp_pf_inet_specific) 1212 return 0; 1213 sctp_pf_inet_specific = pf; 1214 break; 1215 case PF_INET6: 1216 if (sctp_pf_inet6_specific) 1217 return 0; 1218 sctp_pf_inet6_specific = pf; 1219 break; 1220 default: 1221 return 0; 1222 } 1223 return 1; 1224 } 1225 1226 static inline int init_sctp_mibs(struct net *net) 1227 { 1228 net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib); 1229 if (!net->sctp.sctp_statistics) 1230 return -ENOMEM; 1231 return 0; 1232 } 1233 1234 static inline void cleanup_sctp_mibs(struct net *net) 1235 { 1236 free_percpu(net->sctp.sctp_statistics); 1237 } 1238 1239 static void sctp_v4_pf_init(void) 1240 { 1241 /* Initialize the SCTP specific PF functions. */ 1242 sctp_register_pf(&sctp_pf_inet, PF_INET); 1243 sctp_register_af(&sctp_af_inet); 1244 } 1245 1246 static void sctp_v4_pf_exit(void) 1247 { 1248 list_del(&sctp_af_inet.list); 1249 } 1250 1251 static int sctp_v4_protosw_init(void) 1252 { 1253 int rc; 1254 1255 rc = proto_register(&sctp_prot, 1); 1256 if (rc) 1257 return rc; 1258 1259 /* Register SCTP(UDP and TCP style) with socket layer. */ 1260 inet_register_protosw(&sctp_seqpacket_protosw); 1261 inet_register_protosw(&sctp_stream_protosw); 1262 1263 return 0; 1264 } 1265 1266 static void sctp_v4_protosw_exit(void) 1267 { 1268 inet_unregister_protosw(&sctp_stream_protosw); 1269 inet_unregister_protosw(&sctp_seqpacket_protosw); 1270 proto_unregister(&sctp_prot); 1271 } 1272 1273 static int sctp_v4_add_protocol(void) 1274 { 1275 /* Register notifier for inet address additions/deletions. */ 1276 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1277 1278 /* Register SCTP with inet layer. */ 1279 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1280 return -EAGAIN; 1281 1282 return 0; 1283 } 1284 1285 static void sctp_v4_del_protocol(void) 1286 { 1287 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1288 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1289 } 1290 1291 static int __net_init sctp_defaults_init(struct net *net) 1292 { 1293 int status; 1294 1295 /* 1296 * 14. Suggested SCTP Protocol Parameter Values 1297 */ 1298 /* The following protocol parameters are RECOMMENDED: */ 1299 /* RTO.Initial - 3 seconds */ 1300 net->sctp.rto_initial = SCTP_RTO_INITIAL; 1301 /* RTO.Min - 1 second */ 1302 net->sctp.rto_min = SCTP_RTO_MIN; 1303 /* RTO.Max - 60 seconds */ 1304 net->sctp.rto_max = SCTP_RTO_MAX; 1305 /* RTO.Alpha - 1/8 */ 1306 net->sctp.rto_alpha = SCTP_RTO_ALPHA; 1307 /* RTO.Beta - 1/4 */ 1308 net->sctp.rto_beta = SCTP_RTO_BETA; 1309 1310 /* Valid.Cookie.Life - 60 seconds */ 1311 net->sctp.valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1312 1313 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1314 net->sctp.cookie_preserve_enable = 1; 1315 1316 /* Default sctp sockets to use md5 as their hmac alg */ 1317 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5) 1318 net->sctp.sctp_hmac_alg = "md5"; 1319 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1) 1320 net->sctp.sctp_hmac_alg = "sha1"; 1321 #else 1322 net->sctp.sctp_hmac_alg = NULL; 1323 #endif 1324 1325 /* Max.Burst - 4 */ 1326 net->sctp.max_burst = SCTP_DEFAULT_MAX_BURST; 1327 1328 /* Disable of Primary Path Switchover by default */ 1329 net->sctp.ps_retrans = SCTP_PS_RETRANS_MAX; 1330 1331 /* Enable pf state by default */ 1332 net->sctp.pf_enable = 1; 1333 1334 /* Ignore pf exposure feature by default */ 1335 net->sctp.pf_expose = SCTP_PF_EXPOSE_UNSET; 1336 1337 /* Association.Max.Retrans - 10 attempts 1338 * Path.Max.Retrans - 5 attempts (per destination address) 1339 * Max.Init.Retransmits - 8 attempts 1340 */ 1341 net->sctp.max_retrans_association = 10; 1342 net->sctp.max_retrans_path = 5; 1343 net->sctp.max_retrans_init = 8; 1344 1345 /* Sendbuffer growth - do per-socket accounting */ 1346 net->sctp.sndbuf_policy = 0; 1347 1348 /* Rcvbuffer growth - do per-socket accounting */ 1349 net->sctp.rcvbuf_policy = 0; 1350 1351 /* HB.interval - 30 seconds */ 1352 net->sctp.hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1353 1354 /* delayed SACK timeout */ 1355 net->sctp.sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1356 1357 /* Disable ADDIP by default. */ 1358 net->sctp.addip_enable = 0; 1359 net->sctp.addip_noauth = 0; 1360 net->sctp.default_auto_asconf = 0; 1361 1362 /* Enable PR-SCTP by default. */ 1363 net->sctp.prsctp_enable = 1; 1364 1365 /* Disable RECONF by default. */ 1366 net->sctp.reconf_enable = 0; 1367 1368 /* Disable AUTH by default. */ 1369 net->sctp.auth_enable = 0; 1370 1371 /* Enable ECN by default. */ 1372 net->sctp.ecn_enable = 1; 1373 1374 /* Set UDP tunneling listening port to 0 by default */ 1375 net->sctp.udp_port = 0; 1376 1377 /* Set remote encap port to 0 by default */ 1378 net->sctp.encap_port = 0; 1379 1380 /* Set SCOPE policy to enabled */ 1381 net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE; 1382 1383 /* Set the default rwnd update threshold */ 1384 net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; 1385 1386 /* Initialize maximum autoclose timeout. */ 1387 net->sctp.max_autoclose = INT_MAX / HZ; 1388 1389 status = sctp_sysctl_net_register(net); 1390 if (status) 1391 goto err_sysctl_register; 1392 1393 /* Allocate and initialise sctp mibs. */ 1394 status = init_sctp_mibs(net); 1395 if (status) 1396 goto err_init_mibs; 1397 1398 #ifdef CONFIG_PROC_FS 1399 /* Initialize proc fs directory. */ 1400 status = sctp_proc_init(net); 1401 if (status) 1402 goto err_init_proc; 1403 #endif 1404 1405 sctp_dbg_objcnt_init(net); 1406 1407 /* Initialize the local address list. */ 1408 INIT_LIST_HEAD(&net->sctp.local_addr_list); 1409 spin_lock_init(&net->sctp.local_addr_lock); 1410 sctp_get_local_addr_list(net); 1411 1412 /* Initialize the address event list */ 1413 INIT_LIST_HEAD(&net->sctp.addr_waitq); 1414 INIT_LIST_HEAD(&net->sctp.auto_asconf_splist); 1415 spin_lock_init(&net->sctp.addr_wq_lock); 1416 net->sctp.addr_wq_timer.expires = 0; 1417 timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0); 1418 1419 return 0; 1420 1421 #ifdef CONFIG_PROC_FS 1422 err_init_proc: 1423 cleanup_sctp_mibs(net); 1424 #endif 1425 err_init_mibs: 1426 sctp_sysctl_net_unregister(net); 1427 err_sysctl_register: 1428 return status; 1429 } 1430 1431 static void __net_exit sctp_defaults_exit(struct net *net) 1432 { 1433 /* Free the local address list */ 1434 sctp_free_addr_wq(net); 1435 sctp_free_local_addr_list(net); 1436 1437 #ifdef CONFIG_PROC_FS 1438 remove_proc_subtree("sctp", net->proc_net); 1439 net->sctp.proc_net_sctp = NULL; 1440 #endif 1441 cleanup_sctp_mibs(net); 1442 sctp_sysctl_net_unregister(net); 1443 } 1444 1445 static struct pernet_operations sctp_defaults_ops = { 1446 .init = sctp_defaults_init, 1447 .exit = sctp_defaults_exit, 1448 }; 1449 1450 static int __net_init sctp_ctrlsock_init(struct net *net) 1451 { 1452 int status; 1453 1454 /* Initialize the control inode/socket for handling OOTB packets. */ 1455 status = sctp_ctl_sock_init(net); 1456 if (status) 1457 pr_err("Failed to initialize the SCTP control sock\n"); 1458 1459 return status; 1460 } 1461 1462 static void __net_exit sctp_ctrlsock_exit(struct net *net) 1463 { 1464 /* Free the control endpoint. */ 1465 inet_ctl_sock_destroy(net->sctp.ctl_sock); 1466 } 1467 1468 static struct pernet_operations sctp_ctrlsock_ops = { 1469 .init = sctp_ctrlsock_init, 1470 .exit = sctp_ctrlsock_exit, 1471 }; 1472 1473 /* Initialize the universe into something sensible. */ 1474 static __init int sctp_init(void) 1475 { 1476 unsigned long nr_pages = totalram_pages(); 1477 unsigned long limit; 1478 unsigned long goal; 1479 int max_entry_order; 1480 int num_entries; 1481 int max_share; 1482 int status; 1483 int order; 1484 int i; 1485 1486 sock_skb_cb_check_size(sizeof(struct sctp_ulpevent)); 1487 1488 /* Allocate bind_bucket and chunk caches. */ 1489 status = -ENOBUFS; 1490 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1491 sizeof(struct sctp_bind_bucket), 1492 0, SLAB_HWCACHE_ALIGN, 1493 NULL); 1494 if (!sctp_bucket_cachep) 1495 goto out; 1496 1497 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1498 sizeof(struct sctp_chunk), 1499 0, SLAB_HWCACHE_ALIGN, 1500 NULL); 1501 if (!sctp_chunk_cachep) 1502 goto err_chunk_cachep; 1503 1504 status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL); 1505 if (status) 1506 goto err_percpu_counter_init; 1507 1508 /* Implementation specific variables. */ 1509 1510 /* Initialize default stream count setup information. */ 1511 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1512 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1513 1514 /* Initialize handle used for association ids. */ 1515 idr_init(&sctp_assocs_id); 1516 1517 limit = nr_free_buffer_pages() / 8; 1518 limit = max(limit, 128UL); 1519 sysctl_sctp_mem[0] = limit / 4 * 3; 1520 sysctl_sctp_mem[1] = limit; 1521 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1522 1523 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1524 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1525 max_share = min(4UL*1024*1024, limit); 1526 1527 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1528 sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1); 1529 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1530 1531 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1532 sysctl_sctp_wmem[1] = 16*1024; 1533 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1534 1535 /* Size and allocate the association hash table. 1536 * The methodology is similar to that of the tcp hash tables. 1537 * Though not identical. Start by getting a goal size 1538 */ 1539 if (nr_pages >= (128 * 1024)) 1540 goal = nr_pages >> (22 - PAGE_SHIFT); 1541 else 1542 goal = nr_pages >> (24 - PAGE_SHIFT); 1543 1544 /* Then compute the page order for said goal */ 1545 order = get_order(goal); 1546 1547 /* Now compute the required page order for the maximum sized table we 1548 * want to create 1549 */ 1550 max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES * 1551 sizeof(struct sctp_bind_hashbucket)); 1552 1553 /* Limit the page order by that maximum hash table size */ 1554 order = min(order, max_entry_order); 1555 1556 /* Allocate and initialize the endpoint hash table. */ 1557 sctp_ep_hashsize = 64; 1558 sctp_ep_hashtable = 1559 kmalloc_array(64, sizeof(struct sctp_hashbucket), GFP_KERNEL); 1560 if (!sctp_ep_hashtable) { 1561 pr_err("Failed endpoint_hash alloc\n"); 1562 status = -ENOMEM; 1563 goto err_ehash_alloc; 1564 } 1565 for (i = 0; i < sctp_ep_hashsize; i++) { 1566 rwlock_init(&sctp_ep_hashtable[i].lock); 1567 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1568 } 1569 1570 /* Allocate and initialize the SCTP port hash table. 1571 * Note that order is initalized to start at the max sized 1572 * table we want to support. If we can't get that many pages 1573 * reduce the order and try again 1574 */ 1575 do { 1576 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1577 __get_free_pages(GFP_KERNEL | __GFP_NOWARN, order); 1578 } while (!sctp_port_hashtable && --order > 0); 1579 1580 if (!sctp_port_hashtable) { 1581 pr_err("Failed bind hash alloc\n"); 1582 status = -ENOMEM; 1583 goto err_bhash_alloc; 1584 } 1585 1586 /* Now compute the number of entries that will fit in the 1587 * port hash space we allocated 1588 */ 1589 num_entries = (1UL << order) * PAGE_SIZE / 1590 sizeof(struct sctp_bind_hashbucket); 1591 1592 /* And finish by rounding it down to the nearest power of two. 1593 * This wastes some memory of course, but it's needed because 1594 * the hash function operates based on the assumption that 1595 * the number of entries is a power of two. 1596 */ 1597 sctp_port_hashsize = rounddown_pow_of_two(num_entries); 1598 1599 for (i = 0; i < sctp_port_hashsize; i++) { 1600 spin_lock_init(&sctp_port_hashtable[i].lock); 1601 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1602 } 1603 1604 status = sctp_transport_hashtable_init(); 1605 if (status) 1606 goto err_thash_alloc; 1607 1608 pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize, 1609 num_entries); 1610 1611 sctp_sysctl_register(); 1612 1613 INIT_LIST_HEAD(&sctp_address_families); 1614 sctp_v4_pf_init(); 1615 sctp_v6_pf_init(); 1616 sctp_sched_ops_init(); 1617 1618 status = register_pernet_subsys(&sctp_defaults_ops); 1619 if (status) 1620 goto err_register_defaults; 1621 1622 status = sctp_v4_protosw_init(); 1623 if (status) 1624 goto err_protosw_init; 1625 1626 status = sctp_v6_protosw_init(); 1627 if (status) 1628 goto err_v6_protosw_init; 1629 1630 status = register_pernet_subsys(&sctp_ctrlsock_ops); 1631 if (status) 1632 goto err_register_ctrlsock; 1633 1634 status = sctp_v4_add_protocol(); 1635 if (status) 1636 goto err_add_protocol; 1637 1638 /* Register SCTP with inet6 layer. */ 1639 status = sctp_v6_add_protocol(); 1640 if (status) 1641 goto err_v6_add_protocol; 1642 1643 if (sctp_offload_init() < 0) 1644 pr_crit("%s: Cannot add SCTP protocol offload\n", __func__); 1645 1646 out: 1647 return status; 1648 err_v6_add_protocol: 1649 sctp_v4_del_protocol(); 1650 err_add_protocol: 1651 unregister_pernet_subsys(&sctp_ctrlsock_ops); 1652 err_register_ctrlsock: 1653 sctp_v6_protosw_exit(); 1654 err_v6_protosw_init: 1655 sctp_v4_protosw_exit(); 1656 err_protosw_init: 1657 unregister_pernet_subsys(&sctp_defaults_ops); 1658 err_register_defaults: 1659 sctp_v4_pf_exit(); 1660 sctp_v6_pf_exit(); 1661 sctp_sysctl_unregister(); 1662 free_pages((unsigned long)sctp_port_hashtable, 1663 get_order(sctp_port_hashsize * 1664 sizeof(struct sctp_bind_hashbucket))); 1665 err_bhash_alloc: 1666 sctp_transport_hashtable_destroy(); 1667 err_thash_alloc: 1668 kfree(sctp_ep_hashtable); 1669 err_ehash_alloc: 1670 percpu_counter_destroy(&sctp_sockets_allocated); 1671 err_percpu_counter_init: 1672 kmem_cache_destroy(sctp_chunk_cachep); 1673 err_chunk_cachep: 1674 kmem_cache_destroy(sctp_bucket_cachep); 1675 goto out; 1676 } 1677 1678 /* Exit handler for the SCTP protocol. */ 1679 static __exit void sctp_exit(void) 1680 { 1681 /* BUG. This should probably do something useful like clean 1682 * up all the remaining associations and all that memory. 1683 */ 1684 1685 /* Unregister with inet6/inet layers. */ 1686 sctp_v6_del_protocol(); 1687 sctp_v4_del_protocol(); 1688 1689 unregister_pernet_subsys(&sctp_ctrlsock_ops); 1690 1691 /* Free protosw registrations */ 1692 sctp_v6_protosw_exit(); 1693 sctp_v4_protosw_exit(); 1694 1695 unregister_pernet_subsys(&sctp_defaults_ops); 1696 1697 /* Unregister with socket layer. */ 1698 sctp_v6_pf_exit(); 1699 sctp_v4_pf_exit(); 1700 1701 sctp_sysctl_unregister(); 1702 1703 free_pages((unsigned long)sctp_port_hashtable, 1704 get_order(sctp_port_hashsize * 1705 sizeof(struct sctp_bind_hashbucket))); 1706 kfree(sctp_ep_hashtable); 1707 sctp_transport_hashtable_destroy(); 1708 1709 percpu_counter_destroy(&sctp_sockets_allocated); 1710 1711 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1712 1713 kmem_cache_destroy(sctp_chunk_cachep); 1714 kmem_cache_destroy(sctp_bucket_cachep); 1715 } 1716 1717 module_init(sctp_init); 1718 module_exit(sctp_exit); 1719 1720 /* 1721 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1722 */ 1723 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1724 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1725 MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>"); 1726 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1727 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1728 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1729 MODULE_LICENSE("GPL"); 1730