1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2002, 2004 3 * Copyright (c) 2001 Nokia, Inc. 4 * Copyright (c) 2001 La Monte H.P. Yarroll 5 * Copyright (c) 2002-2003 Intel Corp. 6 * 7 * This file is part of the SCTP kernel implementation 8 * 9 * SCTP over IPv6. 10 * 11 * This SCTP implementation is free software; 12 * you can redistribute it and/or modify it under the terms of 13 * the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This SCTP implementation is distributed in the hope that it 18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 19 * ************************ 20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 21 * See the GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with GNU CC; see the file COPYING. If not, write to 25 * the Free Software Foundation, 59 Temple Place - Suite 330, 26 * Boston, MA 02111-1307, USA. 27 * 28 * Please send any bug reports or fixes you make to the 29 * email address(es): 30 * lksctp developers <lksctp-developers@lists.sourceforge.net> 31 * 32 * Or submit a bug report through the following website: 33 * http://www.sf.net/projects/lksctp 34 * 35 * Written or modified by: 36 * Le Yanqun <yanqun.le@nokia.com> 37 * Hui Huang <hui.huang@nokia.com> 38 * La Monte H.P. Yarroll <piggy@acm.org> 39 * Sridhar Samudrala <sri@us.ibm.com> 40 * Jon Grimm <jgrimm@us.ibm.com> 41 * Ardelle Fan <ardelle.fan@intel.com> 42 * 43 * Based on: 44 * linux/net/ipv6/tcp_ipv6.c 45 * 46 * Any bugs reported given to us we will try to fix... any fixes shared will 47 * be incorporated into the next SCTP release. 48 */ 49 50 #include <linux/module.h> 51 #include <linux/errno.h> 52 #include <linux/types.h> 53 #include <linux/socket.h> 54 #include <linux/sockios.h> 55 #include <linux/net.h> 56 #include <linux/in.h> 57 #include <linux/in6.h> 58 #include <linux/netdevice.h> 59 #include <linux/init.h> 60 #include <linux/ipsec.h> 61 62 #include <linux/ipv6.h> 63 #include <linux/icmpv6.h> 64 #include <linux/random.h> 65 #include <linux/seq_file.h> 66 67 #include <net/protocol.h> 68 #include <net/ndisc.h> 69 #include <net/ip.h> 70 #include <net/ipv6.h> 71 #include <net/transp_v6.h> 72 #include <net/addrconf.h> 73 #include <net/ip6_route.h> 74 #include <net/inet_common.h> 75 #include <net/inet_ecn.h> 76 #include <net/sctp/sctp.h> 77 78 #include <asm/uaccess.h> 79 80 /* Event handler for inet6 address addition/deletion events. 81 * The sctp_local_addr_list needs to be protocted by a spin lock since 82 * multiple notifiers (say IPv4 and IPv6) may be running at the same 83 * time and thus corrupt the list. 84 * The reader side is protected with RCU. 85 */ 86 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, 87 void *ptr) 88 { 89 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; 90 struct sctp_sockaddr_entry *addr = NULL; 91 struct sctp_sockaddr_entry *temp; 92 int found = 0; 93 94 switch (ev) { 95 case NETDEV_UP: 96 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 97 if (addr) { 98 addr->a.v6.sin6_family = AF_INET6; 99 addr->a.v6.sin6_port = 0; 100 memcpy(&addr->a.v6.sin6_addr, &ifa->addr, 101 sizeof(struct in6_addr)); 102 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; 103 addr->valid = 1; 104 spin_lock_bh(&sctp_local_addr_lock); 105 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 106 spin_unlock_bh(&sctp_local_addr_lock); 107 } 108 break; 109 case NETDEV_DOWN: 110 spin_lock_bh(&sctp_local_addr_lock); 111 list_for_each_entry_safe(addr, temp, 112 &sctp_local_addr_list, list) { 113 if (addr->a.sa.sa_family == AF_INET6 && 114 ipv6_addr_equal(&addr->a.v6.sin6_addr, 115 &ifa->addr)) { 116 found = 1; 117 addr->valid = 0; 118 list_del_rcu(&addr->list); 119 break; 120 } 121 } 122 spin_unlock_bh(&sctp_local_addr_lock); 123 if (found) 124 call_rcu(&addr->rcu, sctp_local_addr_free); 125 break; 126 } 127 128 return NOTIFY_DONE; 129 } 130 131 static struct notifier_block sctp_inet6addr_notifier = { 132 .notifier_call = sctp_inet6addr_event, 133 }; 134 135 /* ICMP error handler. */ 136 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 137 int type, int code, int offset, __be32 info) 138 { 139 struct inet6_dev *idev; 140 struct sock *sk; 141 struct sctp_association *asoc; 142 struct sctp_transport *transport; 143 struct ipv6_pinfo *np; 144 sk_buff_data_t saveip, savesctp; 145 int err; 146 147 idev = in6_dev_get(skb->dev); 148 149 /* Fix up skb to look at the embedded net header. */ 150 saveip = skb->network_header; 151 savesctp = skb->transport_header; 152 skb_reset_network_header(skb); 153 skb_set_transport_header(skb, offset); 154 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport); 155 /* Put back, the original pointers. */ 156 skb->network_header = saveip; 157 skb->transport_header = savesctp; 158 if (!sk) { 159 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 160 goto out; 161 } 162 163 /* Warning: The sock lock is held. Remember to call 164 * sctp_err_finish! 165 */ 166 167 switch (type) { 168 case ICMPV6_PKT_TOOBIG: 169 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); 170 goto out_unlock; 171 case ICMPV6_PARAMPROB: 172 if (ICMPV6_UNK_NEXTHDR == code) { 173 sctp_icmp_proto_unreachable(sk, asoc, transport); 174 goto out_unlock; 175 } 176 break; 177 default: 178 break; 179 } 180 181 np = inet6_sk(sk); 182 icmpv6_err_convert(type, code, &err); 183 if (!sock_owned_by_user(sk) && np->recverr) { 184 sk->sk_err = err; 185 sk->sk_error_report(sk); 186 } else { /* Only an error on timeout */ 187 sk->sk_err_soft = err; 188 } 189 190 out_unlock: 191 sctp_err_finish(sk, asoc); 192 out: 193 if (likely(idev != NULL)) 194 in6_dev_put(idev); 195 } 196 197 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */ 198 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport) 199 { 200 struct sock *sk = skb->sk; 201 struct ipv6_pinfo *np = inet6_sk(sk); 202 struct flowi fl; 203 204 memset(&fl, 0, sizeof(fl)); 205 206 fl.proto = sk->sk_protocol; 207 208 /* Fill in the dest address from the route entry passed with the skb 209 * and the source address from the transport. 210 */ 211 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr); 212 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr); 213 214 fl.fl6_flowlabel = np->flow_label; 215 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); 216 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL) 217 fl.oif = transport->saddr.v6.sin6_scope_id; 218 else 219 fl.oif = sk->sk_bound_dev_if; 220 221 if (np->opt && np->opt->srcrt) { 222 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 223 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 224 } 225 226 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " 227 "src:" NIP6_FMT " dst:" NIP6_FMT "\n", 228 __func__, skb, skb->len, 229 NIP6(fl.fl6_src), NIP6(fl.fl6_dst)); 230 231 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 232 233 if (!(transport->param_flags & SPP_PMTUD_ENABLE)) 234 skb->local_df = 1; 235 236 return ip6_xmit(sk, skb, &fl, np->opt, 0); 237 } 238 239 /* Returns the dst cache entry for the given source and destination ip 240 * addresses. 241 */ 242 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, 243 union sctp_addr *daddr, 244 union sctp_addr *saddr) 245 { 246 struct dst_entry *dst; 247 struct flowi fl; 248 249 memset(&fl, 0, sizeof(fl)); 250 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); 251 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 252 fl.oif = daddr->v6.sin6_scope_id; 253 254 255 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ", 256 __func__, NIP6(fl.fl6_dst)); 257 258 if (saddr) { 259 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); 260 SCTP_DEBUG_PRINTK( 261 "SRC=" NIP6_FMT " - ", 262 NIP6(fl.fl6_src)); 263 } 264 265 dst = ip6_route_output(&init_net, NULL, &fl); 266 if (!dst->error) { 267 struct rt6_info *rt; 268 rt = (struct rt6_info *)dst; 269 SCTP_DEBUG_PRINTK( 270 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n", 271 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr)); 272 return dst; 273 } 274 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 275 dst_release(dst); 276 return NULL; 277 } 278 279 /* Returns the number of consecutive initial bits that match in the 2 ipv6 280 * addresses. 281 */ 282 static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 283 union sctp_addr *s2) 284 { 285 struct in6_addr *a1 = &s1->v6.sin6_addr; 286 struct in6_addr *a2 = &s2->v6.sin6_addr; 287 int i, j; 288 289 for (i = 0; i < 4 ; i++) { 290 __be32 a1xora2; 291 292 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; 293 294 if ((j = fls(ntohl(a1xora2)))) 295 return (i * 32 + 32 - j); 296 } 297 298 return (i*32); 299 } 300 301 /* Fills in the source address(saddr) based on the destination address(daddr) 302 * and asoc's bind address list. 303 */ 304 static void sctp_v6_get_saddr(struct sctp_sock *sk, 305 struct sctp_association *asoc, 306 struct dst_entry *dst, 307 union sctp_addr *daddr, 308 union sctp_addr *saddr) 309 { 310 struct sctp_bind_addr *bp; 311 struct sctp_sockaddr_entry *laddr; 312 sctp_scope_t scope; 313 union sctp_addr *baddr = NULL; 314 __u8 matchlen = 0; 315 __u8 bmatchlen; 316 317 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p " 318 "daddr:" NIP6_FMT " ", 319 __func__, asoc, dst, NIP6(daddr->v6.sin6_addr)); 320 321 if (!asoc) { 322 ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, 323 &daddr->v6.sin6_addr, 324 inet6_sk(&sk->inet.sk)->srcprefs, 325 &saddr->v6.sin6_addr); 326 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n", 327 NIP6(saddr->v6.sin6_addr)); 328 return; 329 } 330 331 scope = sctp_scope(daddr); 332 333 bp = &asoc->base.bind_addr; 334 335 /* Go through the bind address list and find the best source address 336 * that matches the scope of the destination address. 337 */ 338 rcu_read_lock(); 339 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 340 if (!laddr->valid) 341 continue; 342 if ((laddr->state == SCTP_ADDR_SRC) && 343 (laddr->a.sa.sa_family == AF_INET6) && 344 (scope <= sctp_scope(&laddr->a))) { 345 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 346 if (!baddr || (matchlen < bmatchlen)) { 347 baddr = &laddr->a; 348 matchlen = bmatchlen; 349 } 350 } 351 } 352 353 if (baddr) { 354 memcpy(saddr, baddr, sizeof(union sctp_addr)); 355 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n", 356 NIP6(saddr->v6.sin6_addr)); 357 } else { 358 printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 359 "address for the dest:" NIP6_FMT "\n", 360 __func__, asoc, NIP6(daddr->v6.sin6_addr)); 361 } 362 363 rcu_read_unlock(); 364 } 365 366 /* Make a copy of all potential local addresses. */ 367 static void sctp_v6_copy_addrlist(struct list_head *addrlist, 368 struct net_device *dev) 369 { 370 struct inet6_dev *in6_dev; 371 struct inet6_ifaddr *ifp; 372 struct sctp_sockaddr_entry *addr; 373 374 rcu_read_lock(); 375 if ((in6_dev = __in6_dev_get(dev)) == NULL) { 376 rcu_read_unlock(); 377 return; 378 } 379 380 read_lock_bh(&in6_dev->lock); 381 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { 382 /* Add the address to the local list. */ 383 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 384 if (addr) { 385 addr->a.v6.sin6_family = AF_INET6; 386 addr->a.v6.sin6_port = 0; 387 addr->a.v6.sin6_addr = ifp->addr; 388 addr->a.v6.sin6_scope_id = dev->ifindex; 389 addr->valid = 1; 390 INIT_LIST_HEAD(&addr->list); 391 INIT_RCU_HEAD(&addr->rcu); 392 list_add_tail(&addr->list, addrlist); 393 } 394 } 395 396 read_unlock_bh(&in6_dev->lock); 397 rcu_read_unlock(); 398 } 399 400 /* Initialize a sockaddr_storage from in incoming skb. */ 401 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 402 int is_saddr) 403 { 404 void *from; 405 __be16 *port; 406 struct sctphdr *sh; 407 408 port = &addr->v6.sin6_port; 409 addr->v6.sin6_family = AF_INET6; 410 addr->v6.sin6_flowinfo = 0; /* FIXME */ 411 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 412 413 sh = sctp_hdr(skb); 414 if (is_saddr) { 415 *port = sh->source; 416 from = &ipv6_hdr(skb)->saddr; 417 } else { 418 *port = sh->dest; 419 from = &ipv6_hdr(skb)->daddr; 420 } 421 ipv6_addr_copy(&addr->v6.sin6_addr, from); 422 } 423 424 /* Initialize an sctp_addr from a socket. */ 425 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 426 { 427 addr->v6.sin6_family = AF_INET6; 428 addr->v6.sin6_port = 0; 429 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 430 } 431 432 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 433 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 434 { 435 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 436 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 437 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 438 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 439 inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 440 addr->v4.sin_addr.s_addr; 441 } else { 442 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 443 } 444 } 445 446 /* Initialize sk->sk_daddr from sctp_addr. */ 447 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 448 { 449 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 450 inet6_sk(sk)->daddr.s6_addr32[0] = 0; 451 inet6_sk(sk)->daddr.s6_addr32[1] = 0; 452 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 453 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 454 } else { 455 inet6_sk(sk)->daddr = addr->v6.sin6_addr; 456 } 457 } 458 459 /* Initialize a sctp_addr from an address parameter. */ 460 static void sctp_v6_from_addr_param(union sctp_addr *addr, 461 union sctp_addr_param *param, 462 __be16 port, int iif) 463 { 464 addr->v6.sin6_family = AF_INET6; 465 addr->v6.sin6_port = port; 466 addr->v6.sin6_flowinfo = 0; /* BUG */ 467 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 468 addr->v6.sin6_scope_id = iif; 469 } 470 471 /* Initialize an address parameter from a sctp_addr and return the length 472 * of the address parameter. 473 */ 474 static int sctp_v6_to_addr_param(const union sctp_addr *addr, 475 union sctp_addr_param *param) 476 { 477 int length = sizeof(sctp_ipv6addr_param_t); 478 479 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 480 param->v6.param_hdr.length = htons(length); 481 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 482 483 return length; 484 } 485 486 /* Initialize a sctp_addr from a dst_entry. */ 487 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 488 __be16 port) 489 { 490 struct rt6_info *rt = (struct rt6_info *)dst; 491 addr->sa.sa_family = AF_INET6; 492 addr->v6.sin6_port = port; 493 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 494 } 495 496 /* Compare addresses exactly. 497 * v4-mapped-v6 is also in consideration. 498 */ 499 static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 500 const union sctp_addr *addr2) 501 { 502 if (addr1->sa.sa_family != addr2->sa.sa_family) { 503 if (addr1->sa.sa_family == AF_INET && 504 addr2->sa.sa_family == AF_INET6 && 505 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) { 506 if (addr2->v6.sin6_port == addr1->v4.sin_port && 507 addr2->v6.sin6_addr.s6_addr32[3] == 508 addr1->v4.sin_addr.s_addr) 509 return 1; 510 } 511 if (addr2->sa.sa_family == AF_INET && 512 addr1->sa.sa_family == AF_INET6 && 513 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) { 514 if (addr1->v6.sin6_port == addr2->v4.sin_port && 515 addr1->v6.sin6_addr.s6_addr32[3] == 516 addr2->v4.sin_addr.s_addr) 517 return 1; 518 } 519 return 0; 520 } 521 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 522 return 0; 523 /* If this is a linklocal address, compare the scope_id. */ 524 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 525 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 526 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 527 return 0; 528 } 529 } 530 531 return 1; 532 } 533 534 /* Initialize addr struct to INADDR_ANY. */ 535 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) 536 { 537 memset(addr, 0x00, sizeof(union sctp_addr)); 538 addr->v6.sin6_family = AF_INET6; 539 addr->v6.sin6_port = port; 540 } 541 542 /* Is this a wildcard address? */ 543 static int sctp_v6_is_any(const union sctp_addr *addr) 544 { 545 return ipv6_addr_any(&addr->v6.sin6_addr); 546 } 547 548 /* Should this be available for binding? */ 549 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 550 { 551 int type; 552 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 553 554 type = ipv6_addr_type(in6); 555 if (IPV6_ADDR_ANY == type) 556 return 1; 557 if (type == IPV6_ADDR_MAPPED) { 558 if (sp && !sp->v4mapped) 559 return 0; 560 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 561 return 0; 562 sctp_v6_map_v4(addr); 563 return sctp_get_af_specific(AF_INET)->available(addr, sp); 564 } 565 if (!(type & IPV6_ADDR_UNICAST)) 566 return 0; 567 568 return ipv6_chk_addr(&init_net, in6, NULL, 0); 569 } 570 571 /* This function checks if the address is a valid address to be used for 572 * SCTP. 573 * 574 * Output: 575 * Return 0 - If the address is a non-unicast or an illegal address. 576 * Return 1 - If the address is a unicast. 577 */ 578 static int sctp_v6_addr_valid(union sctp_addr *addr, 579 struct sctp_sock *sp, 580 const struct sk_buff *skb) 581 { 582 int ret = ipv6_addr_type(&addr->v6.sin6_addr); 583 584 /* Support v4-mapped-v6 address. */ 585 if (ret == IPV6_ADDR_MAPPED) { 586 /* Note: This routine is used in input, so v4-mapped-v6 587 * are disallowed here when there is no sctp_sock. 588 */ 589 if (!sp || !sp->v4mapped) 590 return 0; 591 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 592 return 0; 593 sctp_v6_map_v4(addr); 594 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 595 } 596 597 /* Is this a non-unicast address */ 598 if (!(ret & IPV6_ADDR_UNICAST)) 599 return 0; 600 601 return 1; 602 } 603 604 /* What is the scope of 'addr'? */ 605 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 606 { 607 int v6scope; 608 sctp_scope_t retval; 609 610 /* The IPv6 scope is really a set of bit fields. 611 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 612 */ 613 614 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 615 switch (v6scope) { 616 case IFA_HOST: 617 retval = SCTP_SCOPE_LOOPBACK; 618 break; 619 case IFA_LINK: 620 retval = SCTP_SCOPE_LINK; 621 break; 622 case IFA_SITE: 623 retval = SCTP_SCOPE_PRIVATE; 624 break; 625 default: 626 retval = SCTP_SCOPE_GLOBAL; 627 break; 628 } 629 630 return retval; 631 } 632 633 /* Create and initialize a new sk for the socket to be returned by accept(). */ 634 static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 635 struct sctp_association *asoc) 636 { 637 struct inet_sock *inet = inet_sk(sk); 638 struct sock *newsk; 639 struct inet_sock *newinet; 640 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 641 struct sctp6_sock *newsctp6sk; 642 643 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot); 644 if (!newsk) 645 goto out; 646 647 sock_init_data(NULL, newsk); 648 649 newsk->sk_type = SOCK_STREAM; 650 651 newsk->sk_prot = sk->sk_prot; 652 newsk->sk_no_check = sk->sk_no_check; 653 newsk->sk_reuse = sk->sk_reuse; 654 655 newsk->sk_destruct = inet_sock_destruct; 656 newsk->sk_family = PF_INET6; 657 newsk->sk_protocol = IPPROTO_SCTP; 658 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 659 newsk->sk_shutdown = sk->sk_shutdown; 660 sock_reset_flag(sk, SOCK_ZAPPED); 661 662 newsctp6sk = (struct sctp6_sock *)newsk; 663 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 664 665 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped; 666 667 newinet = inet_sk(newsk); 668 newnp = inet6_sk(newsk); 669 670 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 671 672 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 673 * and getpeername(). 674 */ 675 newinet->sport = inet->sport; 676 newnp->saddr = np->saddr; 677 newnp->rcv_saddr = np->rcv_saddr; 678 newinet->dport = htons(asoc->peer.port); 679 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 680 681 /* Init the ipv4 part of the socket since we can have sockets 682 * using v6 API for ipv4. 683 */ 684 newinet->uc_ttl = -1; 685 newinet->mc_loop = 1; 686 newinet->mc_ttl = 1; 687 newinet->mc_index = 0; 688 newinet->mc_list = NULL; 689 690 if (ipv4_config.no_pmtu_disc) 691 newinet->pmtudisc = IP_PMTUDISC_DONT; 692 else 693 newinet->pmtudisc = IP_PMTUDISC_WANT; 694 695 sk_refcnt_debug_inc(newsk); 696 697 if (newsk->sk_prot->init(newsk)) { 698 sk_common_release(newsk); 699 newsk = NULL; 700 } 701 702 out: 703 return newsk; 704 } 705 706 /* Map v4 address to mapped v6 address */ 707 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 708 { 709 if (sp->v4mapped && AF_INET == addr->sa.sa_family) 710 sctp_v4_map_v6(addr); 711 } 712 713 /* Where did this skb come from? */ 714 static int sctp_v6_skb_iif(const struct sk_buff *skb) 715 { 716 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 717 return opt->iif; 718 } 719 720 /* Was this packet marked by Explicit Congestion Notification? */ 721 static int sctp_v6_is_ce(const struct sk_buff *skb) 722 { 723 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20); 724 } 725 726 /* Dump the v6 addr to the seq file. */ 727 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 728 { 729 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr)); 730 } 731 732 static void sctp_v6_ecn_capable(struct sock *sk) 733 { 734 inet6_sk(sk)->tclass |= INET_ECN_ECT_0; 735 } 736 737 /* Initialize a PF_INET6 socket msg_name. */ 738 static void sctp_inet6_msgname(char *msgname, int *addr_len) 739 { 740 struct sockaddr_in6 *sin6; 741 742 sin6 = (struct sockaddr_in6 *)msgname; 743 sin6->sin6_family = AF_INET6; 744 sin6->sin6_flowinfo = 0; 745 sin6->sin6_scope_id = 0; /*FIXME */ 746 *addr_len = sizeof(struct sockaddr_in6); 747 } 748 749 /* Initialize a PF_INET msgname from a ulpevent. */ 750 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 751 char *msgname, int *addrlen) 752 { 753 struct sockaddr_in6 *sin6, *sin6from; 754 755 if (msgname) { 756 union sctp_addr *addr; 757 struct sctp_association *asoc; 758 759 asoc = event->asoc; 760 sctp_inet6_msgname(msgname, addrlen); 761 sin6 = (struct sockaddr_in6 *)msgname; 762 sin6->sin6_port = htons(asoc->peer.port); 763 addr = &asoc->peer.primary_addr; 764 765 /* Note: If we go to a common v6 format, this code 766 * will change. 767 */ 768 769 /* Map ipv4 address into v4-mapped-on-v6 address. */ 770 if (sctp_sk(asoc->base.sk)->v4mapped && 771 AF_INET == addr->sa.sa_family) { 772 sctp_v4_map_v6((union sctp_addr *)sin6); 773 sin6->sin6_addr.s6_addr32[3] = 774 addr->v4.sin_addr.s_addr; 775 return; 776 } 777 778 sin6from = &asoc->peer.primary_addr.v6; 779 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 780 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 781 sin6->sin6_scope_id = sin6from->sin6_scope_id; 782 } 783 } 784 785 /* Initialize a msg_name from an inbound skb. */ 786 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 787 int *addr_len) 788 { 789 struct sctphdr *sh; 790 struct sockaddr_in6 *sin6; 791 792 if (msgname) { 793 sctp_inet6_msgname(msgname, addr_len); 794 sin6 = (struct sockaddr_in6 *)msgname; 795 sh = sctp_hdr(skb); 796 sin6->sin6_port = sh->source; 797 798 /* Map ipv4 address into v4-mapped-on-v6 address. */ 799 if (sctp_sk(skb->sk)->v4mapped && 800 ip_hdr(skb)->version == 4) { 801 sctp_v4_map_v6((union sctp_addr *)sin6); 802 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr; 803 return; 804 } 805 806 /* Otherwise, just copy the v6 address. */ 807 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 808 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 809 struct sctp_ulpevent *ev = sctp_skb2event(skb); 810 sin6->sin6_scope_id = ev->iif; 811 } 812 } 813 } 814 815 /* Do we support this AF? */ 816 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 817 { 818 switch (family) { 819 case AF_INET6: 820 return 1; 821 /* v4-mapped-v6 addresses */ 822 case AF_INET: 823 if (!__ipv6_only_sock(sctp_opt2sk(sp))) 824 return 1; 825 default: 826 return 0; 827 } 828 } 829 830 /* Address matching with wildcards allowed. This extra level 831 * of indirection lets us choose whether a PF_INET6 should 832 * disallow any v4 addresses if we so choose. 833 */ 834 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 835 const union sctp_addr *addr2, 836 struct sctp_sock *opt) 837 { 838 struct sctp_af *af1, *af2; 839 840 af1 = sctp_get_af_specific(addr1->sa.sa_family); 841 af2 = sctp_get_af_specific(addr2->sa.sa_family); 842 843 if (!af1 || !af2) 844 return 0; 845 846 /* If the socket is IPv6 only, v4 addrs will not match */ 847 if (__ipv6_only_sock(sctp_opt2sk(opt)) && af1 != af2) 848 return 0; 849 850 /* Today, wildcard AF_INET/AF_INET6. */ 851 if (sctp_is_any(addr1) || sctp_is_any(addr2)) 852 return 1; 853 854 if (addr1->sa.sa_family != addr2->sa.sa_family) 855 return 0; 856 857 return af1->cmp_addr(addr1, addr2); 858 } 859 860 /* Verify that the provided sockaddr looks bindable. Common verification, 861 * has already been taken care of. 862 */ 863 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 864 { 865 struct sctp_af *af; 866 867 /* ASSERT: address family has already been verified. */ 868 if (addr->sa.sa_family != AF_INET6) 869 af = sctp_get_af_specific(addr->sa.sa_family); 870 else { 871 int type = ipv6_addr_type(&addr->v6.sin6_addr); 872 struct net_device *dev; 873 874 if (type & IPV6_ADDR_LINKLOCAL) { 875 if (!addr->v6.sin6_scope_id) 876 return 0; 877 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id); 878 if (!dev) 879 return 0; 880 if (!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr, 881 dev, 0)) { 882 dev_put(dev); 883 return 0; 884 } 885 dev_put(dev); 886 } else if (type == IPV6_ADDR_MAPPED) { 887 if (!opt->v4mapped) 888 return 0; 889 } 890 891 af = opt->pf->af; 892 } 893 return af->available(addr, opt); 894 } 895 896 /* Verify that the provided sockaddr looks sendable. Common verification, 897 * has already been taken care of. 898 */ 899 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 900 { 901 struct sctp_af *af = NULL; 902 903 /* ASSERT: address family has already been verified. */ 904 if (addr->sa.sa_family != AF_INET6) 905 af = sctp_get_af_specific(addr->sa.sa_family); 906 else { 907 int type = ipv6_addr_type(&addr->v6.sin6_addr); 908 struct net_device *dev; 909 910 if (type & IPV6_ADDR_LINKLOCAL) { 911 if (!addr->v6.sin6_scope_id) 912 return 0; 913 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id); 914 if (!dev) 915 return 0; 916 dev_put(dev); 917 } 918 af = opt->pf->af; 919 } 920 921 return af != NULL; 922 } 923 924 /* Fill in Supported Address Type information for INIT and INIT-ACK 925 * chunks. Note: In the future, we may want to look at sock options 926 * to determine whether a PF_INET6 socket really wants to have IPV4 927 * addresses. 928 * Returns number of addresses supported. 929 */ 930 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 931 __be16 *types) 932 { 933 types[0] = SCTP_PARAM_IPV6_ADDRESS; 934 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) { 935 types[1] = SCTP_PARAM_IPV4_ADDRESS; 936 return 2; 937 } 938 return 1; 939 } 940 941 static const struct proto_ops inet6_seqpacket_ops = { 942 .family = PF_INET6, 943 .owner = THIS_MODULE, 944 .release = inet6_release, 945 .bind = inet6_bind, 946 .connect = inet_dgram_connect, 947 .socketpair = sock_no_socketpair, 948 .accept = inet_accept, 949 .getname = inet6_getname, 950 .poll = sctp_poll, 951 .ioctl = inet6_ioctl, 952 .listen = sctp_inet_listen, 953 .shutdown = inet_shutdown, 954 .setsockopt = sock_common_setsockopt, 955 .getsockopt = sock_common_getsockopt, 956 .sendmsg = inet_sendmsg, 957 .recvmsg = sock_common_recvmsg, 958 .mmap = sock_no_mmap, 959 #ifdef CONFIG_COMPAT 960 .compat_setsockopt = compat_sock_common_setsockopt, 961 .compat_getsockopt = compat_sock_common_getsockopt, 962 #endif 963 }; 964 965 static struct inet_protosw sctpv6_seqpacket_protosw = { 966 .type = SOCK_SEQPACKET, 967 .protocol = IPPROTO_SCTP, 968 .prot = &sctpv6_prot, 969 .ops = &inet6_seqpacket_ops, 970 .capability = -1, 971 .no_check = 0, 972 .flags = SCTP_PROTOSW_FLAG 973 }; 974 static struct inet_protosw sctpv6_stream_protosw = { 975 .type = SOCK_STREAM, 976 .protocol = IPPROTO_SCTP, 977 .prot = &sctpv6_prot, 978 .ops = &inet6_seqpacket_ops, 979 .capability = -1, 980 .no_check = 0, 981 .flags = SCTP_PROTOSW_FLAG, 982 }; 983 984 static int sctp6_rcv(struct sk_buff *skb) 985 { 986 return sctp_rcv(skb) ? -1 : 0; 987 } 988 989 static struct inet6_protocol sctpv6_protocol = { 990 .handler = sctp6_rcv, 991 .err_handler = sctp_v6_err, 992 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 993 }; 994 995 static struct sctp_af sctp_af_inet6 = { 996 .sa_family = AF_INET6, 997 .sctp_xmit = sctp_v6_xmit, 998 .setsockopt = ipv6_setsockopt, 999 .getsockopt = ipv6_getsockopt, 1000 .get_dst = sctp_v6_get_dst, 1001 .get_saddr = sctp_v6_get_saddr, 1002 .copy_addrlist = sctp_v6_copy_addrlist, 1003 .from_skb = sctp_v6_from_skb, 1004 .from_sk = sctp_v6_from_sk, 1005 .to_sk_saddr = sctp_v6_to_sk_saddr, 1006 .to_sk_daddr = sctp_v6_to_sk_daddr, 1007 .from_addr_param = sctp_v6_from_addr_param, 1008 .to_addr_param = sctp_v6_to_addr_param, 1009 .dst_saddr = sctp_v6_dst_saddr, 1010 .cmp_addr = sctp_v6_cmp_addr, 1011 .scope = sctp_v6_scope, 1012 .addr_valid = sctp_v6_addr_valid, 1013 .inaddr_any = sctp_v6_inaddr_any, 1014 .is_any = sctp_v6_is_any, 1015 .available = sctp_v6_available, 1016 .skb_iif = sctp_v6_skb_iif, 1017 .is_ce = sctp_v6_is_ce, 1018 .seq_dump_addr = sctp_v6_seq_dump_addr, 1019 .ecn_capable = sctp_v6_ecn_capable, 1020 .net_header_len = sizeof(struct ipv6hdr), 1021 .sockaddr_len = sizeof(struct sockaddr_in6), 1022 #ifdef CONFIG_COMPAT 1023 .compat_setsockopt = compat_ipv6_setsockopt, 1024 .compat_getsockopt = compat_ipv6_getsockopt, 1025 #endif 1026 }; 1027 1028 static struct sctp_pf sctp_pf_inet6 = { 1029 .event_msgname = sctp_inet6_event_msgname, 1030 .skb_msgname = sctp_inet6_skb_msgname, 1031 .af_supported = sctp_inet6_af_supported, 1032 .cmp_addr = sctp_inet6_cmp_addr, 1033 .bind_verify = sctp_inet6_bind_verify, 1034 .send_verify = sctp_inet6_send_verify, 1035 .supported_addrs = sctp_inet6_supported_addrs, 1036 .create_accept_sk = sctp_v6_create_accept_sk, 1037 .addr_v4map = sctp_v6_addr_v4map, 1038 .af = &sctp_af_inet6, 1039 }; 1040 1041 /* Initialize IPv6 support and register with socket layer. */ 1042 void sctp_v6_pf_init(void) 1043 { 1044 /* Register the SCTP specific PF_INET6 functions. */ 1045 sctp_register_pf(&sctp_pf_inet6, PF_INET6); 1046 1047 /* Register the SCTP specific AF_INET6 functions. */ 1048 sctp_register_af(&sctp_af_inet6); 1049 } 1050 1051 void sctp_v6_pf_exit(void) 1052 { 1053 list_del(&sctp_af_inet6.list); 1054 } 1055 1056 /* Initialize IPv6 support and register with socket layer. */ 1057 int sctp_v6_protosw_init(void) 1058 { 1059 int rc; 1060 1061 rc = proto_register(&sctpv6_prot, 1); 1062 if (rc) 1063 return rc; 1064 1065 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 1066 inet6_register_protosw(&sctpv6_seqpacket_protosw); 1067 inet6_register_protosw(&sctpv6_stream_protosw); 1068 1069 return 0; 1070 } 1071 1072 void sctp_v6_protosw_exit(void) 1073 { 1074 inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1075 inet6_unregister_protosw(&sctpv6_stream_protosw); 1076 proto_unregister(&sctpv6_prot); 1077 } 1078 1079 1080 /* Register with inet6 layer. */ 1081 int sctp_v6_add_protocol(void) 1082 { 1083 /* Register notifier for inet6 address additions/deletions. */ 1084 register_inet6addr_notifier(&sctp_inet6addr_notifier); 1085 1086 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 1087 return -EAGAIN; 1088 1089 return 0; 1090 } 1091 1092 /* Unregister with inet6 layer. */ 1093 void sctp_v6_del_protocol(void) 1094 { 1095 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1096 unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 1097 } 1098