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(sock_net(sctp_opt2sk(sk)), 323 dst ? ip6_dst_idev(dst)->dev : NULL, 324 &daddr->v6.sin6_addr, 325 inet6_sk(&sk->inet.sk)->srcprefs, 326 &saddr->v6.sin6_addr); 327 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n", 328 NIP6(saddr->v6.sin6_addr)); 329 return; 330 } 331 332 scope = sctp_scope(daddr); 333 334 bp = &asoc->base.bind_addr; 335 336 /* Go through the bind address list and find the best source address 337 * that matches the scope of the destination address. 338 */ 339 rcu_read_lock(); 340 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 341 if (!laddr->valid) 342 continue; 343 if ((laddr->state == SCTP_ADDR_SRC) && 344 (laddr->a.sa.sa_family == AF_INET6) && 345 (scope <= sctp_scope(&laddr->a))) { 346 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 347 if (!baddr || (matchlen < bmatchlen)) { 348 baddr = &laddr->a; 349 matchlen = bmatchlen; 350 } 351 } 352 } 353 354 if (baddr) { 355 memcpy(saddr, baddr, sizeof(union sctp_addr)); 356 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n", 357 NIP6(saddr->v6.sin6_addr)); 358 } else { 359 printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 360 "address for the dest:" NIP6_FMT "\n", 361 __func__, asoc, NIP6(daddr->v6.sin6_addr)); 362 } 363 364 rcu_read_unlock(); 365 } 366 367 /* Make a copy of all potential local addresses. */ 368 static void sctp_v6_copy_addrlist(struct list_head *addrlist, 369 struct net_device *dev) 370 { 371 struct inet6_dev *in6_dev; 372 struct inet6_ifaddr *ifp; 373 struct sctp_sockaddr_entry *addr; 374 375 rcu_read_lock(); 376 if ((in6_dev = __in6_dev_get(dev)) == NULL) { 377 rcu_read_unlock(); 378 return; 379 } 380 381 read_lock_bh(&in6_dev->lock); 382 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { 383 /* Add the address to the local list. */ 384 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 385 if (addr) { 386 addr->a.v6.sin6_family = AF_INET6; 387 addr->a.v6.sin6_port = 0; 388 addr->a.v6.sin6_addr = ifp->addr; 389 addr->a.v6.sin6_scope_id = dev->ifindex; 390 addr->valid = 1; 391 INIT_LIST_HEAD(&addr->list); 392 INIT_RCU_HEAD(&addr->rcu); 393 list_add_tail(&addr->list, addrlist); 394 } 395 } 396 397 read_unlock_bh(&in6_dev->lock); 398 rcu_read_unlock(); 399 } 400 401 /* Initialize a sockaddr_storage from in incoming skb. */ 402 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 403 int is_saddr) 404 { 405 void *from; 406 __be16 *port; 407 struct sctphdr *sh; 408 409 port = &addr->v6.sin6_port; 410 addr->v6.sin6_family = AF_INET6; 411 addr->v6.sin6_flowinfo = 0; /* FIXME */ 412 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 413 414 sh = sctp_hdr(skb); 415 if (is_saddr) { 416 *port = sh->source; 417 from = &ipv6_hdr(skb)->saddr; 418 } else { 419 *port = sh->dest; 420 from = &ipv6_hdr(skb)->daddr; 421 } 422 ipv6_addr_copy(&addr->v6.sin6_addr, from); 423 } 424 425 /* Initialize an sctp_addr from a socket. */ 426 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 427 { 428 addr->v6.sin6_family = AF_INET6; 429 addr->v6.sin6_port = 0; 430 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 431 } 432 433 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 434 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 435 { 436 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 437 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 438 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 439 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 440 inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 441 addr->v4.sin_addr.s_addr; 442 } else { 443 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 444 } 445 } 446 447 /* Initialize sk->sk_daddr from sctp_addr. */ 448 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 449 { 450 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 451 inet6_sk(sk)->daddr.s6_addr32[0] = 0; 452 inet6_sk(sk)->daddr.s6_addr32[1] = 0; 453 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 454 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 455 } else { 456 inet6_sk(sk)->daddr = addr->v6.sin6_addr; 457 } 458 } 459 460 /* Initialize a sctp_addr from an address parameter. */ 461 static void sctp_v6_from_addr_param(union sctp_addr *addr, 462 union sctp_addr_param *param, 463 __be16 port, int iif) 464 { 465 addr->v6.sin6_family = AF_INET6; 466 addr->v6.sin6_port = port; 467 addr->v6.sin6_flowinfo = 0; /* BUG */ 468 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 469 addr->v6.sin6_scope_id = iif; 470 } 471 472 /* Initialize an address parameter from a sctp_addr and return the length 473 * of the address parameter. 474 */ 475 static int sctp_v6_to_addr_param(const union sctp_addr *addr, 476 union sctp_addr_param *param) 477 { 478 int length = sizeof(sctp_ipv6addr_param_t); 479 480 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 481 param->v6.param_hdr.length = htons(length); 482 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 483 484 return length; 485 } 486 487 /* Initialize a sctp_addr from a dst_entry. */ 488 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 489 __be16 port) 490 { 491 struct rt6_info *rt = (struct rt6_info *)dst; 492 addr->sa.sa_family = AF_INET6; 493 addr->v6.sin6_port = port; 494 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 495 } 496 497 /* Compare addresses exactly. 498 * v4-mapped-v6 is also in consideration. 499 */ 500 static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 501 const union sctp_addr *addr2) 502 { 503 if (addr1->sa.sa_family != addr2->sa.sa_family) { 504 if (addr1->sa.sa_family == AF_INET && 505 addr2->sa.sa_family == AF_INET6 && 506 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) { 507 if (addr2->v6.sin6_port == addr1->v4.sin_port && 508 addr2->v6.sin6_addr.s6_addr32[3] == 509 addr1->v4.sin_addr.s_addr) 510 return 1; 511 } 512 if (addr2->sa.sa_family == AF_INET && 513 addr1->sa.sa_family == AF_INET6 && 514 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) { 515 if (addr1->v6.sin6_port == addr2->v4.sin_port && 516 addr1->v6.sin6_addr.s6_addr32[3] == 517 addr2->v4.sin_addr.s_addr) 518 return 1; 519 } 520 return 0; 521 } 522 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 523 return 0; 524 /* If this is a linklocal address, compare the scope_id. */ 525 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 526 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 527 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 528 return 0; 529 } 530 } 531 532 return 1; 533 } 534 535 /* Initialize addr struct to INADDR_ANY. */ 536 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) 537 { 538 memset(addr, 0x00, sizeof(union sctp_addr)); 539 addr->v6.sin6_family = AF_INET6; 540 addr->v6.sin6_port = port; 541 } 542 543 /* Is this a wildcard address? */ 544 static int sctp_v6_is_any(const union sctp_addr *addr) 545 { 546 return ipv6_addr_any(&addr->v6.sin6_addr); 547 } 548 549 /* Should this be available for binding? */ 550 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 551 { 552 int type; 553 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 554 555 type = ipv6_addr_type(in6); 556 if (IPV6_ADDR_ANY == type) 557 return 1; 558 if (type == IPV6_ADDR_MAPPED) { 559 if (sp && !sp->v4mapped) 560 return 0; 561 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 562 return 0; 563 sctp_v6_map_v4(addr); 564 return sctp_get_af_specific(AF_INET)->available(addr, sp); 565 } 566 if (!(type & IPV6_ADDR_UNICAST)) 567 return 0; 568 569 return ipv6_chk_addr(&init_net, in6, NULL, 0); 570 } 571 572 /* This function checks if the address is a valid address to be used for 573 * SCTP. 574 * 575 * Output: 576 * Return 0 - If the address is a non-unicast or an illegal address. 577 * Return 1 - If the address is a unicast. 578 */ 579 static int sctp_v6_addr_valid(union sctp_addr *addr, 580 struct sctp_sock *sp, 581 const struct sk_buff *skb) 582 { 583 int ret = ipv6_addr_type(&addr->v6.sin6_addr); 584 585 /* Support v4-mapped-v6 address. */ 586 if (ret == IPV6_ADDR_MAPPED) { 587 /* Note: This routine is used in input, so v4-mapped-v6 588 * are disallowed here when there is no sctp_sock. 589 */ 590 if (!sp || !sp->v4mapped) 591 return 0; 592 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 593 return 0; 594 sctp_v6_map_v4(addr); 595 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 596 } 597 598 /* Is this a non-unicast address */ 599 if (!(ret & IPV6_ADDR_UNICAST)) 600 return 0; 601 602 return 1; 603 } 604 605 /* What is the scope of 'addr'? */ 606 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 607 { 608 int v6scope; 609 sctp_scope_t retval; 610 611 /* The IPv6 scope is really a set of bit fields. 612 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 613 */ 614 615 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 616 switch (v6scope) { 617 case IFA_HOST: 618 retval = SCTP_SCOPE_LOOPBACK; 619 break; 620 case IFA_LINK: 621 retval = SCTP_SCOPE_LINK; 622 break; 623 case IFA_SITE: 624 retval = SCTP_SCOPE_PRIVATE; 625 break; 626 default: 627 retval = SCTP_SCOPE_GLOBAL; 628 break; 629 } 630 631 return retval; 632 } 633 634 /* Create and initialize a new sk for the socket to be returned by accept(). */ 635 static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 636 struct sctp_association *asoc) 637 { 638 struct inet_sock *inet = inet_sk(sk); 639 struct sock *newsk; 640 struct inet_sock *newinet; 641 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 642 struct sctp6_sock *newsctp6sk; 643 644 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot); 645 if (!newsk) 646 goto out; 647 648 sock_init_data(NULL, newsk); 649 650 newsk->sk_type = SOCK_STREAM; 651 652 newsk->sk_prot = sk->sk_prot; 653 newsk->sk_no_check = sk->sk_no_check; 654 newsk->sk_reuse = sk->sk_reuse; 655 656 newsk->sk_destruct = inet_sock_destruct; 657 newsk->sk_family = PF_INET6; 658 newsk->sk_protocol = IPPROTO_SCTP; 659 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 660 newsk->sk_shutdown = sk->sk_shutdown; 661 sock_reset_flag(sk, SOCK_ZAPPED); 662 663 newsctp6sk = (struct sctp6_sock *)newsk; 664 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 665 666 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped; 667 668 newinet = inet_sk(newsk); 669 newnp = inet6_sk(newsk); 670 671 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 672 673 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 674 * and getpeername(). 675 */ 676 newinet->sport = inet->sport; 677 newnp->saddr = np->saddr; 678 newnp->rcv_saddr = np->rcv_saddr; 679 newinet->dport = htons(asoc->peer.port); 680 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 681 682 /* Init the ipv4 part of the socket since we can have sockets 683 * using v6 API for ipv4. 684 */ 685 newinet->uc_ttl = -1; 686 newinet->mc_loop = 1; 687 newinet->mc_ttl = 1; 688 newinet->mc_index = 0; 689 newinet->mc_list = NULL; 690 691 if (ipv4_config.no_pmtu_disc) 692 newinet->pmtudisc = IP_PMTUDISC_DONT; 693 else 694 newinet->pmtudisc = IP_PMTUDISC_WANT; 695 696 sk_refcnt_debug_inc(newsk); 697 698 if (newsk->sk_prot->init(newsk)) { 699 sk_common_release(newsk); 700 newsk = NULL; 701 } 702 703 out: 704 return newsk; 705 } 706 707 /* Map v4 address to mapped v6 address */ 708 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 709 { 710 if (sp->v4mapped && AF_INET == addr->sa.sa_family) 711 sctp_v4_map_v6(addr); 712 } 713 714 /* Where did this skb come from? */ 715 static int sctp_v6_skb_iif(const struct sk_buff *skb) 716 { 717 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 718 return opt->iif; 719 } 720 721 /* Was this packet marked by Explicit Congestion Notification? */ 722 static int sctp_v6_is_ce(const struct sk_buff *skb) 723 { 724 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20); 725 } 726 727 /* Dump the v6 addr to the seq file. */ 728 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 729 { 730 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr)); 731 } 732 733 static void sctp_v6_ecn_capable(struct sock *sk) 734 { 735 inet6_sk(sk)->tclass |= INET_ECN_ECT_0; 736 } 737 738 /* Initialize a PF_INET6 socket msg_name. */ 739 static void sctp_inet6_msgname(char *msgname, int *addr_len) 740 { 741 struct sockaddr_in6 *sin6; 742 743 sin6 = (struct sockaddr_in6 *)msgname; 744 sin6->sin6_family = AF_INET6; 745 sin6->sin6_flowinfo = 0; 746 sin6->sin6_scope_id = 0; /*FIXME */ 747 *addr_len = sizeof(struct sockaddr_in6); 748 } 749 750 /* Initialize a PF_INET msgname from a ulpevent. */ 751 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 752 char *msgname, int *addrlen) 753 { 754 struct sockaddr_in6 *sin6, *sin6from; 755 756 if (msgname) { 757 union sctp_addr *addr; 758 struct sctp_association *asoc; 759 760 asoc = event->asoc; 761 sctp_inet6_msgname(msgname, addrlen); 762 sin6 = (struct sockaddr_in6 *)msgname; 763 sin6->sin6_port = htons(asoc->peer.port); 764 addr = &asoc->peer.primary_addr; 765 766 /* Note: If we go to a common v6 format, this code 767 * will change. 768 */ 769 770 /* Map ipv4 address into v4-mapped-on-v6 address. */ 771 if (sctp_sk(asoc->base.sk)->v4mapped && 772 AF_INET == addr->sa.sa_family) { 773 sctp_v4_map_v6((union sctp_addr *)sin6); 774 sin6->sin6_addr.s6_addr32[3] = 775 addr->v4.sin_addr.s_addr; 776 return; 777 } 778 779 sin6from = &asoc->peer.primary_addr.v6; 780 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 781 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 782 sin6->sin6_scope_id = sin6from->sin6_scope_id; 783 } 784 } 785 786 /* Initialize a msg_name from an inbound skb. */ 787 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 788 int *addr_len) 789 { 790 struct sctphdr *sh; 791 struct sockaddr_in6 *sin6; 792 793 if (msgname) { 794 sctp_inet6_msgname(msgname, addr_len); 795 sin6 = (struct sockaddr_in6 *)msgname; 796 sh = sctp_hdr(skb); 797 sin6->sin6_port = sh->source; 798 799 /* Map ipv4 address into v4-mapped-on-v6 address. */ 800 if (sctp_sk(skb->sk)->v4mapped && 801 ip_hdr(skb)->version == 4) { 802 sctp_v4_map_v6((union sctp_addr *)sin6); 803 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr; 804 return; 805 } 806 807 /* Otherwise, just copy the v6 address. */ 808 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 809 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 810 struct sctp_ulpevent *ev = sctp_skb2event(skb); 811 sin6->sin6_scope_id = ev->iif; 812 } 813 } 814 } 815 816 /* Do we support this AF? */ 817 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 818 { 819 switch (family) { 820 case AF_INET6: 821 return 1; 822 /* v4-mapped-v6 addresses */ 823 case AF_INET: 824 if (!__ipv6_only_sock(sctp_opt2sk(sp))) 825 return 1; 826 default: 827 return 0; 828 } 829 } 830 831 /* Address matching with wildcards allowed. This extra level 832 * of indirection lets us choose whether a PF_INET6 should 833 * disallow any v4 addresses if we so choose. 834 */ 835 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 836 const union sctp_addr *addr2, 837 struct sctp_sock *opt) 838 { 839 struct sctp_af *af1, *af2; 840 841 af1 = sctp_get_af_specific(addr1->sa.sa_family); 842 af2 = sctp_get_af_specific(addr2->sa.sa_family); 843 844 if (!af1 || !af2) 845 return 0; 846 847 /* If the socket is IPv6 only, v4 addrs will not match */ 848 if (__ipv6_only_sock(sctp_opt2sk(opt)) && af1 != af2) 849 return 0; 850 851 /* Today, wildcard AF_INET/AF_INET6. */ 852 if (sctp_is_any(addr1) || sctp_is_any(addr2)) 853 return 1; 854 855 if (addr1->sa.sa_family != addr2->sa.sa_family) 856 return 0; 857 858 return af1->cmp_addr(addr1, addr2); 859 } 860 861 /* Verify that the provided sockaddr looks bindable. Common verification, 862 * has already been taken care of. 863 */ 864 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 865 { 866 struct sctp_af *af; 867 868 /* ASSERT: address family has already been verified. */ 869 if (addr->sa.sa_family != AF_INET6) 870 af = sctp_get_af_specific(addr->sa.sa_family); 871 else { 872 int type = ipv6_addr_type(&addr->v6.sin6_addr); 873 struct net_device *dev; 874 875 if (type & IPV6_ADDR_LINKLOCAL) { 876 if (!addr->v6.sin6_scope_id) 877 return 0; 878 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id); 879 if (!dev) 880 return 0; 881 if (!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr, 882 dev, 0)) { 883 dev_put(dev); 884 return 0; 885 } 886 dev_put(dev); 887 } else if (type == IPV6_ADDR_MAPPED) { 888 if (!opt->v4mapped) 889 return 0; 890 } 891 892 af = opt->pf->af; 893 } 894 return af->available(addr, opt); 895 } 896 897 /* Verify that the provided sockaddr looks sendable. Common verification, 898 * has already been taken care of. 899 */ 900 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 901 { 902 struct sctp_af *af = NULL; 903 904 /* ASSERT: address family has already been verified. */ 905 if (addr->sa.sa_family != AF_INET6) 906 af = sctp_get_af_specific(addr->sa.sa_family); 907 else { 908 int type = ipv6_addr_type(&addr->v6.sin6_addr); 909 struct net_device *dev; 910 911 if (type & IPV6_ADDR_LINKLOCAL) { 912 if (!addr->v6.sin6_scope_id) 913 return 0; 914 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id); 915 if (!dev) 916 return 0; 917 dev_put(dev); 918 } 919 af = opt->pf->af; 920 } 921 922 return af != NULL; 923 } 924 925 /* Fill in Supported Address Type information for INIT and INIT-ACK 926 * chunks. Note: In the future, we may want to look at sock options 927 * to determine whether a PF_INET6 socket really wants to have IPV4 928 * addresses. 929 * Returns number of addresses supported. 930 */ 931 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 932 __be16 *types) 933 { 934 types[0] = SCTP_PARAM_IPV6_ADDRESS; 935 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) { 936 types[1] = SCTP_PARAM_IPV4_ADDRESS; 937 return 2; 938 } 939 return 1; 940 } 941 942 static const struct proto_ops inet6_seqpacket_ops = { 943 .family = PF_INET6, 944 .owner = THIS_MODULE, 945 .release = inet6_release, 946 .bind = inet6_bind, 947 .connect = inet_dgram_connect, 948 .socketpair = sock_no_socketpair, 949 .accept = inet_accept, 950 .getname = inet6_getname, 951 .poll = sctp_poll, 952 .ioctl = inet6_ioctl, 953 .listen = sctp_inet_listen, 954 .shutdown = inet_shutdown, 955 .setsockopt = sock_common_setsockopt, 956 .getsockopt = sock_common_getsockopt, 957 .sendmsg = inet_sendmsg, 958 .recvmsg = sock_common_recvmsg, 959 .mmap = sock_no_mmap, 960 #ifdef CONFIG_COMPAT 961 .compat_setsockopt = compat_sock_common_setsockopt, 962 .compat_getsockopt = compat_sock_common_getsockopt, 963 #endif 964 }; 965 966 static struct inet_protosw sctpv6_seqpacket_protosw = { 967 .type = SOCK_SEQPACKET, 968 .protocol = IPPROTO_SCTP, 969 .prot = &sctpv6_prot, 970 .ops = &inet6_seqpacket_ops, 971 .capability = -1, 972 .no_check = 0, 973 .flags = SCTP_PROTOSW_FLAG 974 }; 975 static struct inet_protosw sctpv6_stream_protosw = { 976 .type = SOCK_STREAM, 977 .protocol = IPPROTO_SCTP, 978 .prot = &sctpv6_prot, 979 .ops = &inet6_seqpacket_ops, 980 .capability = -1, 981 .no_check = 0, 982 .flags = SCTP_PROTOSW_FLAG, 983 }; 984 985 static int sctp6_rcv(struct sk_buff *skb) 986 { 987 return sctp_rcv(skb) ? -1 : 0; 988 } 989 990 static struct inet6_protocol sctpv6_protocol = { 991 .handler = sctp6_rcv, 992 .err_handler = sctp_v6_err, 993 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 994 }; 995 996 static struct sctp_af sctp_af_inet6 = { 997 .sa_family = AF_INET6, 998 .sctp_xmit = sctp_v6_xmit, 999 .setsockopt = ipv6_setsockopt, 1000 .getsockopt = ipv6_getsockopt, 1001 .get_dst = sctp_v6_get_dst, 1002 .get_saddr = sctp_v6_get_saddr, 1003 .copy_addrlist = sctp_v6_copy_addrlist, 1004 .from_skb = sctp_v6_from_skb, 1005 .from_sk = sctp_v6_from_sk, 1006 .to_sk_saddr = sctp_v6_to_sk_saddr, 1007 .to_sk_daddr = sctp_v6_to_sk_daddr, 1008 .from_addr_param = sctp_v6_from_addr_param, 1009 .to_addr_param = sctp_v6_to_addr_param, 1010 .dst_saddr = sctp_v6_dst_saddr, 1011 .cmp_addr = sctp_v6_cmp_addr, 1012 .scope = sctp_v6_scope, 1013 .addr_valid = sctp_v6_addr_valid, 1014 .inaddr_any = sctp_v6_inaddr_any, 1015 .is_any = sctp_v6_is_any, 1016 .available = sctp_v6_available, 1017 .skb_iif = sctp_v6_skb_iif, 1018 .is_ce = sctp_v6_is_ce, 1019 .seq_dump_addr = sctp_v6_seq_dump_addr, 1020 .ecn_capable = sctp_v6_ecn_capable, 1021 .net_header_len = sizeof(struct ipv6hdr), 1022 .sockaddr_len = sizeof(struct sockaddr_in6), 1023 #ifdef CONFIG_COMPAT 1024 .compat_setsockopt = compat_ipv6_setsockopt, 1025 .compat_getsockopt = compat_ipv6_getsockopt, 1026 #endif 1027 }; 1028 1029 static struct sctp_pf sctp_pf_inet6 = { 1030 .event_msgname = sctp_inet6_event_msgname, 1031 .skb_msgname = sctp_inet6_skb_msgname, 1032 .af_supported = sctp_inet6_af_supported, 1033 .cmp_addr = sctp_inet6_cmp_addr, 1034 .bind_verify = sctp_inet6_bind_verify, 1035 .send_verify = sctp_inet6_send_verify, 1036 .supported_addrs = sctp_inet6_supported_addrs, 1037 .create_accept_sk = sctp_v6_create_accept_sk, 1038 .addr_v4map = sctp_v6_addr_v4map, 1039 .af = &sctp_af_inet6, 1040 }; 1041 1042 /* Initialize IPv6 support and register with socket layer. */ 1043 void sctp_v6_pf_init(void) 1044 { 1045 /* Register the SCTP specific PF_INET6 functions. */ 1046 sctp_register_pf(&sctp_pf_inet6, PF_INET6); 1047 1048 /* Register the SCTP specific AF_INET6 functions. */ 1049 sctp_register_af(&sctp_af_inet6); 1050 } 1051 1052 void sctp_v6_pf_exit(void) 1053 { 1054 list_del(&sctp_af_inet6.list); 1055 } 1056 1057 /* Initialize IPv6 support and register with socket layer. */ 1058 int sctp_v6_protosw_init(void) 1059 { 1060 int rc; 1061 1062 rc = proto_register(&sctpv6_prot, 1); 1063 if (rc) 1064 return rc; 1065 1066 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 1067 inet6_register_protosw(&sctpv6_seqpacket_protosw); 1068 inet6_register_protosw(&sctpv6_stream_protosw); 1069 1070 return 0; 1071 } 1072 1073 void sctp_v6_protosw_exit(void) 1074 { 1075 inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1076 inet6_unregister_protosw(&sctpv6_stream_protosw); 1077 proto_unregister(&sctpv6_prot); 1078 } 1079 1080 1081 /* Register with inet6 layer. */ 1082 int sctp_v6_add_protocol(void) 1083 { 1084 /* Register notifier for inet6 address additions/deletions. */ 1085 register_inet6addr_notifier(&sctp_inet6addr_notifier); 1086 1087 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 1088 return -EAGAIN; 1089 1090 return 0; 1091 } 1092 1093 /* Unregister with inet6 layer. */ 1094 void sctp_v6_del_protocol(void) 1095 { 1096 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1097 unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 1098 } 1099