1 /* SCTP kernel reference 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 reference Implementation 8 * 9 * SCTP over IPv6. 10 * 11 * The SCTP reference 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 * The SCTP reference 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/sched.h> 57 #include <linux/in.h> 58 #include <linux/in6.h> 59 #include <linux/netdevice.h> 60 #include <linux/init.h> 61 #include <linux/ipsec.h> 62 63 #include <linux/ipv6.h> 64 #include <linux/icmpv6.h> 65 #include <linux/random.h> 66 #include <linux/seq_file.h> 67 68 #include <net/protocol.h> 69 #include <net/ndisc.h> 70 #include <net/ip.h> 71 #include <net/ipv6.h> 72 #include <net/transp_v6.h> 73 #include <net/addrconf.h> 74 #include <net/ip6_route.h> 75 #include <net/inet_common.h> 76 #include <net/inet_ecn.h> 77 #include <net/sctp/sctp.h> 78 79 #include <asm/uaccess.h> 80 81 extern int sctp_inetaddr_event(struct notifier_block *, unsigned long, void *); 82 static struct notifier_block sctp_inet6addr_notifier = { 83 .notifier_call = sctp_inetaddr_event, 84 }; 85 86 /* ICMP error handler. */ 87 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 88 int type, int code, int offset, __u32 info) 89 { 90 struct inet6_dev *idev; 91 struct ipv6hdr *iph = (struct ipv6hdr *)skb->data; 92 struct sctphdr *sh = (struct sctphdr *)(skb->data + offset); 93 struct sock *sk; 94 struct sctp_association *asoc; 95 struct sctp_transport *transport; 96 struct ipv6_pinfo *np; 97 char *saveip, *savesctp; 98 int err; 99 100 idev = in6_dev_get(skb->dev); 101 102 /* Fix up skb to look at the embedded net header. */ 103 saveip = skb->nh.raw; 104 savesctp = skb->h.raw; 105 skb->nh.ipv6h = iph; 106 skb->h.raw = (char *)sh; 107 sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport); 108 /* Put back, the original pointers. */ 109 skb->nh.raw = saveip; 110 skb->h.raw = savesctp; 111 if (!sk) { 112 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 113 goto out; 114 } 115 116 /* Warning: The sock lock is held. Remember to call 117 * sctp_err_finish! 118 */ 119 120 switch (type) { 121 case ICMPV6_PKT_TOOBIG: 122 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); 123 goto out_unlock; 124 case ICMPV6_PARAMPROB: 125 if (ICMPV6_UNK_NEXTHDR == code) { 126 sctp_icmp_proto_unreachable(sk, asoc, transport); 127 goto out_unlock; 128 } 129 break; 130 default: 131 break; 132 } 133 134 np = inet6_sk(sk); 135 icmpv6_err_convert(type, code, &err); 136 if (!sock_owned_by_user(sk) && np->recverr) { 137 sk->sk_err = err; 138 sk->sk_error_report(sk); 139 } else { /* Only an error on timeout */ 140 sk->sk_err_soft = err; 141 } 142 143 out_unlock: 144 sctp_err_finish(sk, asoc); 145 out: 146 if (likely(idev != NULL)) 147 in6_dev_put(idev); 148 } 149 150 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */ 151 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport, 152 int ipfragok) 153 { 154 struct sock *sk = skb->sk; 155 struct ipv6_pinfo *np = inet6_sk(sk); 156 struct flowi fl; 157 158 memset(&fl, 0, sizeof(fl)); 159 160 fl.proto = sk->sk_protocol; 161 162 /* Fill in the dest address from the route entry passed with the skb 163 * and the source address from the transport. 164 */ 165 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr); 166 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr); 167 168 fl.fl6_flowlabel = np->flow_label; 169 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); 170 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL) 171 fl.oif = transport->saddr.v6.sin6_scope_id; 172 else 173 fl.oif = sk->sk_bound_dev_if; 174 fl.fl_ip_sport = inet_sk(sk)->sport; 175 fl.fl_ip_dport = transport->ipaddr.v6.sin6_port; 176 177 if (np->opt && np->opt->srcrt) { 178 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 179 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 180 } 181 182 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " 183 "src:" NIP6_FMT " dst:" NIP6_FMT "\n", 184 __FUNCTION__, skb, skb->len, 185 NIP6(fl.fl6_src), NIP6(fl.fl6_dst)); 186 187 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 188 189 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok); 190 } 191 192 /* Returns the dst cache entry for the given source and destination ip 193 * addresses. 194 */ 195 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, 196 union sctp_addr *daddr, 197 union sctp_addr *saddr) 198 { 199 struct dst_entry *dst; 200 struct flowi fl; 201 202 memset(&fl, 0, sizeof(fl)); 203 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); 204 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 205 fl.oif = daddr->v6.sin6_scope_id; 206 207 208 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ", 209 __FUNCTION__, NIP6(fl.fl6_dst)); 210 211 if (saddr) { 212 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); 213 SCTP_DEBUG_PRINTK( 214 "SRC=" NIP6_FMT " - ", 215 NIP6(fl.fl6_src)); 216 } 217 218 dst = ip6_route_output(NULL, &fl); 219 if (dst) { 220 struct rt6_info *rt; 221 rt = (struct rt6_info *)dst; 222 SCTP_DEBUG_PRINTK( 223 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n", 224 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr)); 225 } else { 226 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 227 } 228 229 return dst; 230 } 231 232 /* Returns the number of consecutive initial bits that match in the 2 ipv6 233 * addresses. 234 */ 235 static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 236 union sctp_addr *s2) 237 { 238 struct in6_addr *a1 = &s1->v6.sin6_addr; 239 struct in6_addr *a2 = &s2->v6.sin6_addr; 240 int i, j; 241 242 for (i = 0; i < 4 ; i++) { 243 __u32 a1xora2; 244 245 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; 246 247 if ((j = fls(ntohl(a1xora2)))) 248 return (i * 32 + 32 - j); 249 } 250 251 return (i*32); 252 } 253 254 /* Fills in the source address(saddr) based on the destination address(daddr) 255 * and asoc's bind address list. 256 */ 257 static void sctp_v6_get_saddr(struct sctp_association *asoc, 258 struct dst_entry *dst, 259 union sctp_addr *daddr, 260 union sctp_addr *saddr) 261 { 262 struct sctp_bind_addr *bp; 263 rwlock_t *addr_lock; 264 struct sctp_sockaddr_entry *laddr; 265 struct list_head *pos; 266 sctp_scope_t scope; 267 union sctp_addr *baddr = NULL; 268 __u8 matchlen = 0; 269 __u8 bmatchlen; 270 271 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p " 272 "daddr:" NIP6_FMT " ", 273 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr)); 274 275 if (!asoc) { 276 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr); 277 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n", 278 NIP6(saddr->v6.sin6_addr)); 279 return; 280 } 281 282 scope = sctp_scope(daddr); 283 284 bp = &asoc->base.bind_addr; 285 addr_lock = &asoc->base.addr_lock; 286 287 /* Go through the bind address list and find the best source address 288 * that matches the scope of the destination address. 289 */ 290 sctp_read_lock(addr_lock); 291 list_for_each(pos, &bp->address_list) { 292 laddr = list_entry(pos, struct sctp_sockaddr_entry, list); 293 if ((laddr->use_as_src) && 294 (laddr->a.sa.sa_family == AF_INET6) && 295 (scope <= sctp_scope(&laddr->a))) { 296 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 297 if (!baddr || (matchlen < bmatchlen)) { 298 baddr = &laddr->a; 299 matchlen = bmatchlen; 300 } 301 } 302 } 303 304 if (baddr) { 305 memcpy(saddr, baddr, sizeof(union sctp_addr)); 306 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n", 307 NIP6(saddr->v6.sin6_addr)); 308 } else { 309 printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 310 "address for the dest:" NIP6_FMT "\n", 311 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr)); 312 } 313 314 sctp_read_unlock(addr_lock); 315 } 316 317 /* Make a copy of all potential local addresses. */ 318 static void sctp_v6_copy_addrlist(struct list_head *addrlist, 319 struct net_device *dev) 320 { 321 struct inet6_dev *in6_dev; 322 struct inet6_ifaddr *ifp; 323 struct sctp_sockaddr_entry *addr; 324 325 read_lock(&addrconf_lock); 326 if ((in6_dev = __in6_dev_get(dev)) == NULL) { 327 read_unlock(&addrconf_lock); 328 return; 329 } 330 331 read_lock(&in6_dev->lock); 332 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { 333 /* Add the address to the local list. */ 334 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 335 if (addr) { 336 addr->a.v6.sin6_family = AF_INET6; 337 addr->a.v6.sin6_port = 0; 338 addr->a.v6.sin6_addr = ifp->addr; 339 addr->a.v6.sin6_scope_id = dev->ifindex; 340 INIT_LIST_HEAD(&addr->list); 341 list_add_tail(&addr->list, addrlist); 342 } 343 } 344 345 read_unlock(&in6_dev->lock); 346 read_unlock(&addrconf_lock); 347 } 348 349 /* Initialize a sockaddr_storage from in incoming skb. */ 350 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 351 int is_saddr) 352 { 353 void *from; 354 __u16 *port; 355 struct sctphdr *sh; 356 357 port = &addr->v6.sin6_port; 358 addr->v6.sin6_family = AF_INET6; 359 addr->v6.sin6_flowinfo = 0; /* FIXME */ 360 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 361 362 sh = (struct sctphdr *) skb->h.raw; 363 if (is_saddr) { 364 *port = ntohs(sh->source); 365 from = &skb->nh.ipv6h->saddr; 366 } else { 367 *port = ntohs(sh->dest); 368 from = &skb->nh.ipv6h->daddr; 369 } 370 ipv6_addr_copy(&addr->v6.sin6_addr, from); 371 } 372 373 /* Initialize an sctp_addr from a socket. */ 374 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 375 { 376 addr->v6.sin6_family = AF_INET6; 377 addr->v6.sin6_port = inet_sk(sk)->num; 378 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 379 } 380 381 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 382 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 383 { 384 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 385 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 386 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 387 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 388 inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 389 addr->v4.sin_addr.s_addr; 390 } else { 391 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 392 } 393 } 394 395 /* Initialize sk->sk_daddr from sctp_addr. */ 396 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 397 { 398 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 399 inet6_sk(sk)->daddr.s6_addr32[0] = 0; 400 inet6_sk(sk)->daddr.s6_addr32[1] = 0; 401 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 402 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 403 } else { 404 inet6_sk(sk)->daddr = addr->v6.sin6_addr; 405 } 406 } 407 408 /* Initialize a sctp_addr from an address parameter. */ 409 static void sctp_v6_from_addr_param(union sctp_addr *addr, 410 union sctp_addr_param *param, 411 __u16 port, int iif) 412 { 413 addr->v6.sin6_family = AF_INET6; 414 addr->v6.sin6_port = port; 415 addr->v6.sin6_flowinfo = 0; /* BUG */ 416 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 417 addr->v6.sin6_scope_id = iif; 418 } 419 420 /* Initialize an address parameter from a sctp_addr and return the length 421 * of the address parameter. 422 */ 423 static int sctp_v6_to_addr_param(const union sctp_addr *addr, 424 union sctp_addr_param *param) 425 { 426 int length = sizeof(sctp_ipv6addr_param_t); 427 428 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 429 param->v6.param_hdr.length = ntohs(length); 430 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 431 432 return length; 433 } 434 435 /* Initialize a sctp_addr from a dst_entry. */ 436 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 437 unsigned short port) 438 { 439 struct rt6_info *rt = (struct rt6_info *)dst; 440 addr->sa.sa_family = AF_INET6; 441 addr->v6.sin6_port = port; 442 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 443 } 444 445 /* Compare addresses exactly. 446 * v4-mapped-v6 is also in consideration. 447 */ 448 static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 449 const union sctp_addr *addr2) 450 { 451 if (addr1->sa.sa_family != addr2->sa.sa_family) { 452 if (addr1->sa.sa_family == AF_INET && 453 addr2->sa.sa_family == AF_INET6 && 454 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) { 455 if (addr2->v6.sin6_port == addr1->v4.sin_port && 456 addr2->v6.sin6_addr.s6_addr32[3] == 457 addr1->v4.sin_addr.s_addr) 458 return 1; 459 } 460 if (addr2->sa.sa_family == AF_INET && 461 addr1->sa.sa_family == AF_INET6 && 462 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) { 463 if (addr1->v6.sin6_port == addr2->v4.sin_port && 464 addr1->v6.sin6_addr.s6_addr32[3] == 465 addr2->v4.sin_addr.s_addr) 466 return 1; 467 } 468 return 0; 469 } 470 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 471 return 0; 472 /* If this is a linklocal address, compare the scope_id. */ 473 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 474 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 475 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 476 return 0; 477 } 478 } 479 480 return 1; 481 } 482 483 /* Initialize addr struct to INADDR_ANY. */ 484 static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port) 485 { 486 memset(addr, 0x00, sizeof(union sctp_addr)); 487 addr->v6.sin6_family = AF_INET6; 488 addr->v6.sin6_port = port; 489 } 490 491 /* Is this a wildcard address? */ 492 static int sctp_v6_is_any(const union sctp_addr *addr) 493 { 494 return ipv6_addr_any(&addr->v6.sin6_addr); 495 } 496 497 /* Should this be available for binding? */ 498 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 499 { 500 int type; 501 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 502 503 type = ipv6_addr_type(in6); 504 if (IPV6_ADDR_ANY == type) 505 return 1; 506 if (type == IPV6_ADDR_MAPPED) { 507 if (sp && !sp->v4mapped) 508 return 0; 509 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 510 return 0; 511 sctp_v6_map_v4(addr); 512 return sctp_get_af_specific(AF_INET)->available(addr, sp); 513 } 514 if (!(type & IPV6_ADDR_UNICAST)) 515 return 0; 516 517 return ipv6_chk_addr(in6, NULL, 0); 518 } 519 520 /* This function checks if the address is a valid address to be used for 521 * SCTP. 522 * 523 * Output: 524 * Return 0 - If the address is a non-unicast or an illegal address. 525 * Return 1 - If the address is a unicast. 526 */ 527 static int sctp_v6_addr_valid(union sctp_addr *addr, 528 struct sctp_sock *sp, 529 const struct sk_buff *skb) 530 { 531 int ret = ipv6_addr_type(&addr->v6.sin6_addr); 532 533 /* Support v4-mapped-v6 address. */ 534 if (ret == IPV6_ADDR_MAPPED) { 535 /* Note: This routine is used in input, so v4-mapped-v6 536 * are disallowed here when there is no sctp_sock. 537 */ 538 if (!sp || !sp->v4mapped) 539 return 0; 540 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 541 return 0; 542 sctp_v6_map_v4(addr); 543 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 544 } 545 546 /* Is this a non-unicast address */ 547 if (!(ret & IPV6_ADDR_UNICAST)) 548 return 0; 549 550 return 1; 551 } 552 553 /* What is the scope of 'addr'? */ 554 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 555 { 556 int v6scope; 557 sctp_scope_t retval; 558 559 /* The IPv6 scope is really a set of bit fields. 560 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 561 */ 562 563 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 564 switch (v6scope) { 565 case IFA_HOST: 566 retval = SCTP_SCOPE_LOOPBACK; 567 break; 568 case IFA_LINK: 569 retval = SCTP_SCOPE_LINK; 570 break; 571 case IFA_SITE: 572 retval = SCTP_SCOPE_PRIVATE; 573 break; 574 default: 575 retval = SCTP_SCOPE_GLOBAL; 576 break; 577 }; 578 579 return retval; 580 } 581 582 /* Create and initialize a new sk for the socket to be returned by accept(). */ 583 static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 584 struct sctp_association *asoc) 585 { 586 struct inet_sock *inet = inet_sk(sk); 587 struct sock *newsk; 588 struct inet_sock *newinet; 589 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 590 struct sctp6_sock *newsctp6sk; 591 592 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1); 593 if (!newsk) 594 goto out; 595 596 sock_init_data(NULL, newsk); 597 598 newsk->sk_type = SOCK_STREAM; 599 600 newsk->sk_prot = sk->sk_prot; 601 newsk->sk_no_check = sk->sk_no_check; 602 newsk->sk_reuse = sk->sk_reuse; 603 604 newsk->sk_destruct = inet_sock_destruct; 605 newsk->sk_family = PF_INET6; 606 newsk->sk_protocol = IPPROTO_SCTP; 607 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 608 newsk->sk_shutdown = sk->sk_shutdown; 609 sock_reset_flag(sk, SOCK_ZAPPED); 610 611 newsctp6sk = (struct sctp6_sock *)newsk; 612 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 613 614 newinet = inet_sk(newsk); 615 newnp = inet6_sk(newsk); 616 617 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 618 619 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 620 * and getpeername(). 621 */ 622 newinet->sport = inet->sport; 623 newnp->saddr = np->saddr; 624 newnp->rcv_saddr = np->rcv_saddr; 625 newinet->dport = htons(asoc->peer.port); 626 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 627 628 /* Init the ipv4 part of the socket since we can have sockets 629 * using v6 API for ipv4. 630 */ 631 newinet->uc_ttl = -1; 632 newinet->mc_loop = 1; 633 newinet->mc_ttl = 1; 634 newinet->mc_index = 0; 635 newinet->mc_list = NULL; 636 637 if (ipv4_config.no_pmtu_disc) 638 newinet->pmtudisc = IP_PMTUDISC_DONT; 639 else 640 newinet->pmtudisc = IP_PMTUDISC_WANT; 641 642 sk_refcnt_debug_inc(newsk); 643 644 if (newsk->sk_prot->init(newsk)) { 645 sk_common_release(newsk); 646 newsk = NULL; 647 } 648 649 out: 650 return newsk; 651 } 652 653 /* Map v4 address to mapped v6 address */ 654 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 655 { 656 if (sp->v4mapped && AF_INET == addr->sa.sa_family) 657 sctp_v4_map_v6(addr); 658 } 659 660 /* Where did this skb come from? */ 661 static int sctp_v6_skb_iif(const struct sk_buff *skb) 662 { 663 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 664 return opt->iif; 665 } 666 667 /* Was this packet marked by Explicit Congestion Notification? */ 668 static int sctp_v6_is_ce(const struct sk_buff *skb) 669 { 670 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20); 671 } 672 673 /* Dump the v6 addr to the seq file. */ 674 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 675 { 676 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr)); 677 } 678 679 /* Initialize a PF_INET6 socket msg_name. */ 680 static void sctp_inet6_msgname(char *msgname, int *addr_len) 681 { 682 struct sockaddr_in6 *sin6; 683 684 sin6 = (struct sockaddr_in6 *)msgname; 685 sin6->sin6_family = AF_INET6; 686 sin6->sin6_flowinfo = 0; 687 sin6->sin6_scope_id = 0; /*FIXME */ 688 *addr_len = sizeof(struct sockaddr_in6); 689 } 690 691 /* Initialize a PF_INET msgname from a ulpevent. */ 692 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 693 char *msgname, int *addrlen) 694 { 695 struct sockaddr_in6 *sin6, *sin6from; 696 697 if (msgname) { 698 union sctp_addr *addr; 699 struct sctp_association *asoc; 700 701 asoc = event->asoc; 702 sctp_inet6_msgname(msgname, addrlen); 703 sin6 = (struct sockaddr_in6 *)msgname; 704 sin6->sin6_port = htons(asoc->peer.port); 705 addr = &asoc->peer.primary_addr; 706 707 /* Note: If we go to a common v6 format, this code 708 * will change. 709 */ 710 711 /* Map ipv4 address into v4-mapped-on-v6 address. */ 712 if (sctp_sk(asoc->base.sk)->v4mapped && 713 AF_INET == addr->sa.sa_family) { 714 sctp_v4_map_v6((union sctp_addr *)sin6); 715 sin6->sin6_addr.s6_addr32[3] = 716 addr->v4.sin_addr.s_addr; 717 return; 718 } 719 720 sin6from = &asoc->peer.primary_addr.v6; 721 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 722 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 723 sin6->sin6_scope_id = sin6from->sin6_scope_id; 724 } 725 } 726 727 /* Initialize a msg_name from an inbound skb. */ 728 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 729 int *addr_len) 730 { 731 struct sctphdr *sh; 732 struct sockaddr_in6 *sin6; 733 734 if (msgname) { 735 sctp_inet6_msgname(msgname, addr_len); 736 sin6 = (struct sockaddr_in6 *)msgname; 737 sh = (struct sctphdr *)skb->h.raw; 738 sin6->sin6_port = sh->source; 739 740 /* Map ipv4 address into v4-mapped-on-v6 address. */ 741 if (sctp_sk(skb->sk)->v4mapped && 742 skb->nh.iph->version == 4) { 743 sctp_v4_map_v6((union sctp_addr *)sin6); 744 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr; 745 return; 746 } 747 748 /* Otherwise, just copy the v6 address. */ 749 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 750 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 751 struct sctp_ulpevent *ev = sctp_skb2event(skb); 752 sin6->sin6_scope_id = ev->iif; 753 } 754 } 755 } 756 757 /* Do we support this AF? */ 758 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 759 { 760 switch (family) { 761 case AF_INET6: 762 return 1; 763 /* v4-mapped-v6 addresses */ 764 case AF_INET: 765 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped) 766 return 1; 767 default: 768 return 0; 769 } 770 } 771 772 /* Address matching with wildcards allowed. This extra level 773 * of indirection lets us choose whether a PF_INET6 should 774 * disallow any v4 addresses if we so choose. 775 */ 776 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 777 const union sctp_addr *addr2, 778 struct sctp_sock *opt) 779 { 780 struct sctp_af *af1, *af2; 781 782 af1 = sctp_get_af_specific(addr1->sa.sa_family); 783 af2 = sctp_get_af_specific(addr2->sa.sa_family); 784 785 if (!af1 || !af2) 786 return 0; 787 /* Today, wildcard AF_INET/AF_INET6. */ 788 if (sctp_is_any(addr1) || sctp_is_any(addr2)) 789 return 1; 790 791 if (addr1->sa.sa_family != addr2->sa.sa_family) 792 return 0; 793 794 return af1->cmp_addr(addr1, addr2); 795 } 796 797 /* Verify that the provided sockaddr looks bindable. Common verification, 798 * has already been taken care of. 799 */ 800 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 801 { 802 struct sctp_af *af; 803 804 /* ASSERT: address family has already been verified. */ 805 if (addr->sa.sa_family != AF_INET6) 806 af = sctp_get_af_specific(addr->sa.sa_family); 807 else { 808 int type = ipv6_addr_type(&addr->v6.sin6_addr); 809 struct net_device *dev; 810 811 if (type & IPV6_ADDR_LINKLOCAL) { 812 if (!addr->v6.sin6_scope_id) 813 return 0; 814 dev = dev_get_by_index(addr->v6.sin6_scope_id); 815 if (!dev) 816 return 0; 817 dev_put(dev); 818 } 819 af = opt->pf->af; 820 } 821 return af->available(addr, opt); 822 } 823 824 /* Verify that the provided sockaddr looks sendable. Common verification, 825 * has already been taken care of. 826 */ 827 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 828 { 829 struct sctp_af *af = NULL; 830 831 /* ASSERT: address family has already been verified. */ 832 if (addr->sa.sa_family != AF_INET6) 833 af = sctp_get_af_specific(addr->sa.sa_family); 834 else { 835 int type = ipv6_addr_type(&addr->v6.sin6_addr); 836 struct net_device *dev; 837 838 if (type & IPV6_ADDR_LINKLOCAL) { 839 if (!addr->v6.sin6_scope_id) 840 return 0; 841 dev = dev_get_by_index(addr->v6.sin6_scope_id); 842 if (!dev) 843 return 0; 844 dev_put(dev); 845 } 846 af = opt->pf->af; 847 } 848 849 return af != NULL; 850 } 851 852 /* Fill in Supported Address Type information for INIT and INIT-ACK 853 * chunks. Note: In the future, we may want to look at sock options 854 * to determine whether a PF_INET6 socket really wants to have IPV4 855 * addresses. 856 * Returns number of addresses supported. 857 */ 858 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 859 __u16 *types) 860 { 861 types[0] = SCTP_PARAM_IPV4_ADDRESS; 862 types[1] = SCTP_PARAM_IPV6_ADDRESS; 863 return 2; 864 } 865 866 static const struct proto_ops inet6_seqpacket_ops = { 867 .family = PF_INET6, 868 .owner = THIS_MODULE, 869 .release = inet6_release, 870 .bind = inet6_bind, 871 .connect = inet_dgram_connect, 872 .socketpair = sock_no_socketpair, 873 .accept = inet_accept, 874 .getname = inet6_getname, 875 .poll = sctp_poll, 876 .ioctl = inet6_ioctl, 877 .listen = sctp_inet_listen, 878 .shutdown = inet_shutdown, 879 .setsockopt = sock_common_setsockopt, 880 .getsockopt = sock_common_getsockopt, 881 .sendmsg = inet_sendmsg, 882 .recvmsg = sock_common_recvmsg, 883 .mmap = sock_no_mmap, 884 #ifdef CONFIG_COMPAT 885 .compat_setsockopt = compat_sock_common_setsockopt, 886 .compat_getsockopt = compat_sock_common_getsockopt, 887 #endif 888 }; 889 890 static struct inet_protosw sctpv6_seqpacket_protosw = { 891 .type = SOCK_SEQPACKET, 892 .protocol = IPPROTO_SCTP, 893 .prot = &sctpv6_prot, 894 .ops = &inet6_seqpacket_ops, 895 .capability = -1, 896 .no_check = 0, 897 .flags = SCTP_PROTOSW_FLAG 898 }; 899 static struct inet_protosw sctpv6_stream_protosw = { 900 .type = SOCK_STREAM, 901 .protocol = IPPROTO_SCTP, 902 .prot = &sctpv6_prot, 903 .ops = &inet6_seqpacket_ops, 904 .capability = -1, 905 .no_check = 0, 906 .flags = SCTP_PROTOSW_FLAG, 907 }; 908 909 static int sctp6_rcv(struct sk_buff **pskb) 910 { 911 return sctp_rcv(*pskb) ? -1 : 0; 912 } 913 914 static struct inet6_protocol sctpv6_protocol = { 915 .handler = sctp6_rcv, 916 .err_handler = sctp_v6_err, 917 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 918 }; 919 920 static struct sctp_af sctp_ipv6_specific = { 921 .sa_family = AF_INET6, 922 .sctp_xmit = sctp_v6_xmit, 923 .setsockopt = ipv6_setsockopt, 924 .getsockopt = ipv6_getsockopt, 925 .get_dst = sctp_v6_get_dst, 926 .get_saddr = sctp_v6_get_saddr, 927 .copy_addrlist = sctp_v6_copy_addrlist, 928 .from_skb = sctp_v6_from_skb, 929 .from_sk = sctp_v6_from_sk, 930 .to_sk_saddr = sctp_v6_to_sk_saddr, 931 .to_sk_daddr = sctp_v6_to_sk_daddr, 932 .from_addr_param = sctp_v6_from_addr_param, 933 .to_addr_param = sctp_v6_to_addr_param, 934 .dst_saddr = sctp_v6_dst_saddr, 935 .cmp_addr = sctp_v6_cmp_addr, 936 .scope = sctp_v6_scope, 937 .addr_valid = sctp_v6_addr_valid, 938 .inaddr_any = sctp_v6_inaddr_any, 939 .is_any = sctp_v6_is_any, 940 .available = sctp_v6_available, 941 .skb_iif = sctp_v6_skb_iif, 942 .is_ce = sctp_v6_is_ce, 943 .seq_dump_addr = sctp_v6_seq_dump_addr, 944 .net_header_len = sizeof(struct ipv6hdr), 945 .sockaddr_len = sizeof(struct sockaddr_in6), 946 #ifdef CONFIG_COMPAT 947 .compat_setsockopt = compat_ipv6_setsockopt, 948 .compat_getsockopt = compat_ipv6_getsockopt, 949 #endif 950 }; 951 952 static struct sctp_pf sctp_pf_inet6_specific = { 953 .event_msgname = sctp_inet6_event_msgname, 954 .skb_msgname = sctp_inet6_skb_msgname, 955 .af_supported = sctp_inet6_af_supported, 956 .cmp_addr = sctp_inet6_cmp_addr, 957 .bind_verify = sctp_inet6_bind_verify, 958 .send_verify = sctp_inet6_send_verify, 959 .supported_addrs = sctp_inet6_supported_addrs, 960 .create_accept_sk = sctp_v6_create_accept_sk, 961 .addr_v4map = sctp_v6_addr_v4map, 962 .af = &sctp_ipv6_specific, 963 }; 964 965 /* Initialize IPv6 support and register with inet6 stack. */ 966 int sctp_v6_init(void) 967 { 968 int rc = proto_register(&sctpv6_prot, 1); 969 970 if (rc) 971 goto out; 972 /* Register inet6 protocol. */ 973 rc = -EAGAIN; 974 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 975 goto out_unregister_sctp_proto; 976 977 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 978 inet6_register_protosw(&sctpv6_seqpacket_protosw); 979 inet6_register_protosw(&sctpv6_stream_protosw); 980 981 /* Register the SCTP specific PF_INET6 functions. */ 982 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6); 983 984 /* Register the SCTP specific AF_INET6 functions. */ 985 sctp_register_af(&sctp_ipv6_specific); 986 987 /* Register notifier for inet6 address additions/deletions. */ 988 register_inet6addr_notifier(&sctp_inet6addr_notifier); 989 rc = 0; 990 out: 991 return rc; 992 out_unregister_sctp_proto: 993 proto_unregister(&sctpv6_prot); 994 goto out; 995 } 996 997 /* IPv6 specific exit support. */ 998 void sctp_v6_exit(void) 999 { 1000 list_del(&sctp_ipv6_specific.list); 1001 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1002 inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1003 inet6_unregister_protosw(&sctpv6_stream_protosw); 1004 unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 1005 proto_unregister(&sctpv6_prot); 1006 } 1007