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->a.sa.sa_family == AF_INET6) && 294 (scope <= sctp_scope(&laddr->a))) { 295 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 296 if (!baddr || (matchlen < bmatchlen)) { 297 baddr = &laddr->a; 298 matchlen = bmatchlen; 299 } 300 } 301 } 302 303 if (baddr) { 304 memcpy(saddr, baddr, sizeof(union sctp_addr)); 305 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n", 306 NIP6(saddr->v6.sin6_addr)); 307 } else { 308 printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 309 "address for the dest:" NIP6_FMT "\n", 310 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr)); 311 } 312 313 sctp_read_unlock(addr_lock); 314 } 315 316 /* Make a copy of all potential local addresses. */ 317 static void sctp_v6_copy_addrlist(struct list_head *addrlist, 318 struct net_device *dev) 319 { 320 struct inet6_dev *in6_dev; 321 struct inet6_ifaddr *ifp; 322 struct sctp_sockaddr_entry *addr; 323 324 read_lock(&addrconf_lock); 325 if ((in6_dev = __in6_dev_get(dev)) == NULL) { 326 read_unlock(&addrconf_lock); 327 return; 328 } 329 330 read_lock(&in6_dev->lock); 331 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { 332 /* Add the address to the local list. */ 333 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 334 if (addr) { 335 addr->a.v6.sin6_family = AF_INET6; 336 addr->a.v6.sin6_port = 0; 337 addr->a.v6.sin6_addr = ifp->addr; 338 addr->a.v6.sin6_scope_id = dev->ifindex; 339 INIT_LIST_HEAD(&addr->list); 340 list_add_tail(&addr->list, addrlist); 341 } 342 } 343 344 read_unlock(&in6_dev->lock); 345 read_unlock(&addrconf_lock); 346 } 347 348 /* Initialize a sockaddr_storage from in incoming skb. */ 349 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 350 int is_saddr) 351 { 352 void *from; 353 __u16 *port; 354 struct sctphdr *sh; 355 356 port = &addr->v6.sin6_port; 357 addr->v6.sin6_family = AF_INET6; 358 addr->v6.sin6_flowinfo = 0; /* FIXME */ 359 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 360 361 sh = (struct sctphdr *) skb->h.raw; 362 if (is_saddr) { 363 *port = ntohs(sh->source); 364 from = &skb->nh.ipv6h->saddr; 365 } else { 366 *port = ntohs(sh->dest); 367 from = &skb->nh.ipv6h->daddr; 368 } 369 ipv6_addr_copy(&addr->v6.sin6_addr, from); 370 } 371 372 /* Initialize an sctp_addr from a socket. */ 373 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 374 { 375 addr->v6.sin6_family = AF_INET6; 376 addr->v6.sin6_port = inet_sk(sk)->num; 377 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 378 } 379 380 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 381 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 382 { 383 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 384 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 385 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 386 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 387 inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 388 addr->v4.sin_addr.s_addr; 389 } else { 390 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 391 } 392 } 393 394 /* Initialize sk->sk_daddr from sctp_addr. */ 395 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 396 { 397 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 398 inet6_sk(sk)->daddr.s6_addr32[0] = 0; 399 inet6_sk(sk)->daddr.s6_addr32[1] = 0; 400 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 401 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 402 } else { 403 inet6_sk(sk)->daddr = addr->v6.sin6_addr; 404 } 405 } 406 407 /* Initialize a sctp_addr from an address parameter. */ 408 static void sctp_v6_from_addr_param(union sctp_addr *addr, 409 union sctp_addr_param *param, 410 __u16 port, int iif) 411 { 412 addr->v6.sin6_family = AF_INET6; 413 addr->v6.sin6_port = port; 414 addr->v6.sin6_flowinfo = 0; /* BUG */ 415 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 416 addr->v6.sin6_scope_id = iif; 417 } 418 419 /* Initialize an address parameter from a sctp_addr and return the length 420 * of the address parameter. 421 */ 422 static int sctp_v6_to_addr_param(const union sctp_addr *addr, 423 union sctp_addr_param *param) 424 { 425 int length = sizeof(sctp_ipv6addr_param_t); 426 427 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 428 param->v6.param_hdr.length = ntohs(length); 429 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 430 431 return length; 432 } 433 434 /* Initialize a sctp_addr from a dst_entry. */ 435 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 436 unsigned short port) 437 { 438 struct rt6_info *rt = (struct rt6_info *)dst; 439 addr->sa.sa_family = AF_INET6; 440 addr->v6.sin6_port = port; 441 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 442 } 443 444 /* Compare addresses exactly. 445 * v4-mapped-v6 is also in consideration. 446 */ 447 static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 448 const union sctp_addr *addr2) 449 { 450 if (addr1->sa.sa_family != addr2->sa.sa_family) { 451 if (addr1->sa.sa_family == AF_INET && 452 addr2->sa.sa_family == AF_INET6 && 453 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) { 454 if (addr2->v6.sin6_port == addr1->v4.sin_port && 455 addr2->v6.sin6_addr.s6_addr32[3] == 456 addr1->v4.sin_addr.s_addr) 457 return 1; 458 } 459 if (addr2->sa.sa_family == AF_INET && 460 addr1->sa.sa_family == AF_INET6 && 461 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) { 462 if (addr1->v6.sin6_port == addr2->v4.sin_port && 463 addr1->v6.sin6_addr.s6_addr32[3] == 464 addr2->v4.sin_addr.s_addr) 465 return 1; 466 } 467 return 0; 468 } 469 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 470 return 0; 471 /* If this is a linklocal address, compare the scope_id. */ 472 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 473 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 474 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 475 return 0; 476 } 477 } 478 479 return 1; 480 } 481 482 /* Initialize addr struct to INADDR_ANY. */ 483 static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port) 484 { 485 memset(addr, 0x00, sizeof(union sctp_addr)); 486 addr->v6.sin6_family = AF_INET6; 487 addr->v6.sin6_port = port; 488 } 489 490 /* Is this a wildcard address? */ 491 static int sctp_v6_is_any(const union sctp_addr *addr) 492 { 493 return ipv6_addr_any(&addr->v6.sin6_addr); 494 } 495 496 /* Should this be available for binding? */ 497 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 498 { 499 int type; 500 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 501 502 type = ipv6_addr_type(in6); 503 if (IPV6_ADDR_ANY == type) 504 return 1; 505 if (type == IPV6_ADDR_MAPPED) { 506 if (sp && !sp->v4mapped) 507 return 0; 508 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 509 return 0; 510 sctp_v6_map_v4(addr); 511 return sctp_get_af_specific(AF_INET)->available(addr, sp); 512 } 513 if (!(type & IPV6_ADDR_UNICAST)) 514 return 0; 515 516 return ipv6_chk_addr(in6, NULL, 0); 517 } 518 519 /* This function checks if the address is a valid address to be used for 520 * SCTP. 521 * 522 * Output: 523 * Return 0 - If the address is a non-unicast or an illegal address. 524 * Return 1 - If the address is a unicast. 525 */ 526 static int sctp_v6_addr_valid(union sctp_addr *addr, 527 struct sctp_sock *sp, 528 const struct sk_buff *skb) 529 { 530 int ret = ipv6_addr_type(&addr->v6.sin6_addr); 531 532 /* Support v4-mapped-v6 address. */ 533 if (ret == IPV6_ADDR_MAPPED) { 534 /* Note: This routine is used in input, so v4-mapped-v6 535 * are disallowed here when there is no sctp_sock. 536 */ 537 if (!sp || !sp->v4mapped) 538 return 0; 539 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 540 return 0; 541 sctp_v6_map_v4(addr); 542 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 543 } 544 545 /* Is this a non-unicast address */ 546 if (!(ret & IPV6_ADDR_UNICAST)) 547 return 0; 548 549 return 1; 550 } 551 552 /* What is the scope of 'addr'? */ 553 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 554 { 555 int v6scope; 556 sctp_scope_t retval; 557 558 /* The IPv6 scope is really a set of bit fields. 559 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 560 */ 561 562 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 563 switch (v6scope) { 564 case IFA_HOST: 565 retval = SCTP_SCOPE_LOOPBACK; 566 break; 567 case IFA_LINK: 568 retval = SCTP_SCOPE_LINK; 569 break; 570 case IFA_SITE: 571 retval = SCTP_SCOPE_PRIVATE; 572 break; 573 default: 574 retval = SCTP_SCOPE_GLOBAL; 575 break; 576 }; 577 578 return retval; 579 } 580 581 /* Create and initialize a new sk for the socket to be returned by accept(). */ 582 static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 583 struct sctp_association *asoc) 584 { 585 struct inet_sock *inet = inet_sk(sk); 586 struct sock *newsk; 587 struct inet_sock *newinet; 588 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 589 struct sctp6_sock *newsctp6sk; 590 591 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1); 592 if (!newsk) 593 goto out; 594 595 sock_init_data(NULL, newsk); 596 597 newsk->sk_type = SOCK_STREAM; 598 599 newsk->sk_prot = sk->sk_prot; 600 newsk->sk_no_check = sk->sk_no_check; 601 newsk->sk_reuse = sk->sk_reuse; 602 603 newsk->sk_destruct = inet_sock_destruct; 604 newsk->sk_family = PF_INET6; 605 newsk->sk_protocol = IPPROTO_SCTP; 606 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 607 newsk->sk_shutdown = sk->sk_shutdown; 608 sock_reset_flag(sk, SOCK_ZAPPED); 609 610 newsctp6sk = (struct sctp6_sock *)newsk; 611 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 612 613 newinet = inet_sk(newsk); 614 newnp = inet6_sk(newsk); 615 616 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 617 618 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 619 * and getpeername(). 620 */ 621 newinet->sport = inet->sport; 622 newnp->saddr = np->saddr; 623 newnp->rcv_saddr = np->rcv_saddr; 624 newinet->dport = htons(asoc->peer.port); 625 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 626 627 /* Init the ipv4 part of the socket since we can have sockets 628 * using v6 API for ipv4. 629 */ 630 newinet->uc_ttl = -1; 631 newinet->mc_loop = 1; 632 newinet->mc_ttl = 1; 633 newinet->mc_index = 0; 634 newinet->mc_list = NULL; 635 636 if (ipv4_config.no_pmtu_disc) 637 newinet->pmtudisc = IP_PMTUDISC_DONT; 638 else 639 newinet->pmtudisc = IP_PMTUDISC_WANT; 640 641 sk_refcnt_debug_inc(newsk); 642 643 if (newsk->sk_prot->init(newsk)) { 644 sk_common_release(newsk); 645 newsk = NULL; 646 } 647 648 out: 649 return newsk; 650 } 651 652 /* Map v4 address to mapped v6 address */ 653 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 654 { 655 if (sp->v4mapped && AF_INET == addr->sa.sa_family) 656 sctp_v4_map_v6(addr); 657 } 658 659 /* Where did this skb come from? */ 660 static int sctp_v6_skb_iif(const struct sk_buff *skb) 661 { 662 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 663 return opt->iif; 664 } 665 666 /* Was this packet marked by Explicit Congestion Notification? */ 667 static int sctp_v6_is_ce(const struct sk_buff *skb) 668 { 669 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20); 670 } 671 672 /* Dump the v6 addr to the seq file. */ 673 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 674 { 675 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr)); 676 } 677 678 /* Initialize a PF_INET6 socket msg_name. */ 679 static void sctp_inet6_msgname(char *msgname, int *addr_len) 680 { 681 struct sockaddr_in6 *sin6; 682 683 sin6 = (struct sockaddr_in6 *)msgname; 684 sin6->sin6_family = AF_INET6; 685 sin6->sin6_flowinfo = 0; 686 sin6->sin6_scope_id = 0; /*FIXME */ 687 *addr_len = sizeof(struct sockaddr_in6); 688 } 689 690 /* Initialize a PF_INET msgname from a ulpevent. */ 691 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 692 char *msgname, int *addrlen) 693 { 694 struct sockaddr_in6 *sin6, *sin6from; 695 696 if (msgname) { 697 union sctp_addr *addr; 698 struct sctp_association *asoc; 699 700 asoc = event->asoc; 701 sctp_inet6_msgname(msgname, addrlen); 702 sin6 = (struct sockaddr_in6 *)msgname; 703 sin6->sin6_port = htons(asoc->peer.port); 704 addr = &asoc->peer.primary_addr; 705 706 /* Note: If we go to a common v6 format, this code 707 * will change. 708 */ 709 710 /* Map ipv4 address into v4-mapped-on-v6 address. */ 711 if (sctp_sk(asoc->base.sk)->v4mapped && 712 AF_INET == addr->sa.sa_family) { 713 sctp_v4_map_v6((union sctp_addr *)sin6); 714 sin6->sin6_addr.s6_addr32[3] = 715 addr->v4.sin_addr.s_addr; 716 return; 717 } 718 719 sin6from = &asoc->peer.primary_addr.v6; 720 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 721 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 722 sin6->sin6_scope_id = sin6from->sin6_scope_id; 723 } 724 } 725 726 /* Initialize a msg_name from an inbound skb. */ 727 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 728 int *addr_len) 729 { 730 struct sctphdr *sh; 731 struct sockaddr_in6 *sin6; 732 733 if (msgname) { 734 sctp_inet6_msgname(msgname, addr_len); 735 sin6 = (struct sockaddr_in6 *)msgname; 736 sh = (struct sctphdr *)skb->h.raw; 737 sin6->sin6_port = sh->source; 738 739 /* Map ipv4 address into v4-mapped-on-v6 address. */ 740 if (sctp_sk(skb->sk)->v4mapped && 741 skb->nh.iph->version == 4) { 742 sctp_v4_map_v6((union sctp_addr *)sin6); 743 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr; 744 return; 745 } 746 747 /* Otherwise, just copy the v6 address. */ 748 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 749 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 750 struct sctp_ulpevent *ev = sctp_skb2event(skb); 751 sin6->sin6_scope_id = ev->iif; 752 } 753 } 754 } 755 756 /* Do we support this AF? */ 757 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 758 { 759 switch (family) { 760 case AF_INET6: 761 return 1; 762 /* v4-mapped-v6 addresses */ 763 case AF_INET: 764 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped) 765 return 1; 766 default: 767 return 0; 768 } 769 } 770 771 /* Address matching with wildcards allowed. This extra level 772 * of indirection lets us choose whether a PF_INET6 should 773 * disallow any v4 addresses if we so choose. 774 */ 775 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 776 const union sctp_addr *addr2, 777 struct sctp_sock *opt) 778 { 779 struct sctp_af *af1, *af2; 780 781 af1 = sctp_get_af_specific(addr1->sa.sa_family); 782 af2 = sctp_get_af_specific(addr2->sa.sa_family); 783 784 if (!af1 || !af2) 785 return 0; 786 /* Today, wildcard AF_INET/AF_INET6. */ 787 if (sctp_is_any(addr1) || sctp_is_any(addr2)) 788 return 1; 789 790 if (addr1->sa.sa_family != addr2->sa.sa_family) 791 return 0; 792 793 return af1->cmp_addr(addr1, addr2); 794 } 795 796 /* Verify that the provided sockaddr looks bindable. Common verification, 797 * has already been taken care of. 798 */ 799 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 800 { 801 struct sctp_af *af; 802 803 /* ASSERT: address family has already been verified. */ 804 if (addr->sa.sa_family != AF_INET6) 805 af = sctp_get_af_specific(addr->sa.sa_family); 806 else { 807 int type = ipv6_addr_type(&addr->v6.sin6_addr); 808 struct net_device *dev; 809 810 if (type & IPV6_ADDR_LINKLOCAL) { 811 if (!addr->v6.sin6_scope_id) 812 return 0; 813 dev = dev_get_by_index(addr->v6.sin6_scope_id); 814 if (!dev) 815 return 0; 816 dev_put(dev); 817 } 818 af = opt->pf->af; 819 } 820 return af->available(addr, opt); 821 } 822 823 /* Verify that the provided sockaddr looks sendable. Common verification, 824 * has already been taken care of. 825 */ 826 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 827 { 828 struct sctp_af *af = NULL; 829 830 /* ASSERT: address family has already been verified. */ 831 if (addr->sa.sa_family != AF_INET6) 832 af = sctp_get_af_specific(addr->sa.sa_family); 833 else { 834 int type = ipv6_addr_type(&addr->v6.sin6_addr); 835 struct net_device *dev; 836 837 if (type & IPV6_ADDR_LINKLOCAL) { 838 if (!addr->v6.sin6_scope_id) 839 return 0; 840 dev = dev_get_by_index(addr->v6.sin6_scope_id); 841 if (!dev) 842 return 0; 843 dev_put(dev); 844 } 845 af = opt->pf->af; 846 } 847 848 return af != NULL; 849 } 850 851 /* Fill in Supported Address Type information for INIT and INIT-ACK 852 * chunks. Note: In the future, we may want to look at sock options 853 * to determine whether a PF_INET6 socket really wants to have IPV4 854 * addresses. 855 * Returns number of addresses supported. 856 */ 857 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 858 __u16 *types) 859 { 860 types[0] = SCTP_PARAM_IPV4_ADDRESS; 861 types[1] = SCTP_PARAM_IPV6_ADDRESS; 862 return 2; 863 } 864 865 static const struct proto_ops inet6_seqpacket_ops = { 866 .family = PF_INET6, 867 .owner = THIS_MODULE, 868 .release = inet6_release, 869 .bind = inet6_bind, 870 .connect = inet_dgram_connect, 871 .socketpair = sock_no_socketpair, 872 .accept = inet_accept, 873 .getname = inet6_getname, 874 .poll = sctp_poll, 875 .ioctl = inet6_ioctl, 876 .listen = sctp_inet_listen, 877 .shutdown = inet_shutdown, 878 .setsockopt = sock_common_setsockopt, 879 .getsockopt = sock_common_getsockopt, 880 .sendmsg = inet_sendmsg, 881 .recvmsg = sock_common_recvmsg, 882 .mmap = sock_no_mmap, 883 #ifdef CONFIG_COMPAT 884 .compat_setsockopt = compat_sock_common_setsockopt, 885 .compat_getsockopt = compat_sock_common_getsockopt, 886 #endif 887 }; 888 889 static struct inet_protosw sctpv6_seqpacket_protosw = { 890 .type = SOCK_SEQPACKET, 891 .protocol = IPPROTO_SCTP, 892 .prot = &sctpv6_prot, 893 .ops = &inet6_seqpacket_ops, 894 .capability = -1, 895 .no_check = 0, 896 .flags = SCTP_PROTOSW_FLAG 897 }; 898 static struct inet_protosw sctpv6_stream_protosw = { 899 .type = SOCK_STREAM, 900 .protocol = IPPROTO_SCTP, 901 .prot = &sctpv6_prot, 902 .ops = &inet6_seqpacket_ops, 903 .capability = -1, 904 .no_check = 0, 905 .flags = SCTP_PROTOSW_FLAG, 906 }; 907 908 static int sctp6_rcv(struct sk_buff **pskb) 909 { 910 return sctp_rcv(*pskb) ? -1 : 0; 911 } 912 913 static struct inet6_protocol sctpv6_protocol = { 914 .handler = sctp6_rcv, 915 .err_handler = sctp_v6_err, 916 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 917 }; 918 919 static struct sctp_af sctp_ipv6_specific = { 920 .sa_family = AF_INET6, 921 .sctp_xmit = sctp_v6_xmit, 922 .setsockopt = ipv6_setsockopt, 923 .getsockopt = ipv6_getsockopt, 924 .get_dst = sctp_v6_get_dst, 925 .get_saddr = sctp_v6_get_saddr, 926 .copy_addrlist = sctp_v6_copy_addrlist, 927 .from_skb = sctp_v6_from_skb, 928 .from_sk = sctp_v6_from_sk, 929 .to_sk_saddr = sctp_v6_to_sk_saddr, 930 .to_sk_daddr = sctp_v6_to_sk_daddr, 931 .from_addr_param = sctp_v6_from_addr_param, 932 .to_addr_param = sctp_v6_to_addr_param, 933 .dst_saddr = sctp_v6_dst_saddr, 934 .cmp_addr = sctp_v6_cmp_addr, 935 .scope = sctp_v6_scope, 936 .addr_valid = sctp_v6_addr_valid, 937 .inaddr_any = sctp_v6_inaddr_any, 938 .is_any = sctp_v6_is_any, 939 .available = sctp_v6_available, 940 .skb_iif = sctp_v6_skb_iif, 941 .is_ce = sctp_v6_is_ce, 942 .seq_dump_addr = sctp_v6_seq_dump_addr, 943 .net_header_len = sizeof(struct ipv6hdr), 944 .sockaddr_len = sizeof(struct sockaddr_in6), 945 #ifdef CONFIG_COMPAT 946 .compat_setsockopt = compat_ipv6_setsockopt, 947 .compat_getsockopt = compat_ipv6_getsockopt, 948 #endif 949 }; 950 951 static struct sctp_pf sctp_pf_inet6_specific = { 952 .event_msgname = sctp_inet6_event_msgname, 953 .skb_msgname = sctp_inet6_skb_msgname, 954 .af_supported = sctp_inet6_af_supported, 955 .cmp_addr = sctp_inet6_cmp_addr, 956 .bind_verify = sctp_inet6_bind_verify, 957 .send_verify = sctp_inet6_send_verify, 958 .supported_addrs = sctp_inet6_supported_addrs, 959 .create_accept_sk = sctp_v6_create_accept_sk, 960 .addr_v4map = sctp_v6_addr_v4map, 961 .af = &sctp_ipv6_specific, 962 }; 963 964 /* Initialize IPv6 support and register with inet6 stack. */ 965 int sctp_v6_init(void) 966 { 967 int rc = proto_register(&sctpv6_prot, 1); 968 969 if (rc) 970 goto out; 971 /* Register inet6 protocol. */ 972 rc = -EAGAIN; 973 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 974 goto out_unregister_sctp_proto; 975 976 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 977 inet6_register_protosw(&sctpv6_seqpacket_protosw); 978 inet6_register_protosw(&sctpv6_stream_protosw); 979 980 /* Register the SCTP specific PF_INET6 functions. */ 981 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6); 982 983 /* Register the SCTP specific AF_INET6 functions. */ 984 sctp_register_af(&sctp_ipv6_specific); 985 986 /* Register notifier for inet6 address additions/deletions. */ 987 register_inet6addr_notifier(&sctp_inet6addr_notifier); 988 rc = 0; 989 out: 990 return rc; 991 out_unregister_sctp_proto: 992 proto_unregister(&sctpv6_prot); 993 goto out; 994 } 995 996 /* IPv6 specific exit support. */ 997 void sctp_v6_exit(void) 998 { 999 list_del(&sctp_ipv6_specific.list); 1000 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1001 inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1002 inet6_unregister_protosw(&sctpv6_stream_protosw); 1003 unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 1004 proto_unregister(&sctpv6_prot); 1005 } 1006