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/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 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, 82 void *ptr) 83 { 84 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; 85 struct sctp_sockaddr_entry *addr; 86 struct list_head *pos, *temp; 87 88 switch (ev) { 89 case NETDEV_UP: 90 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 91 if (addr) { 92 addr->a.v6.sin6_family = AF_INET6; 93 addr->a.v6.sin6_port = 0; 94 memcpy(&addr->a.v6.sin6_addr, &ifa->addr, 95 sizeof(struct in6_addr)); 96 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; 97 list_add_tail(&addr->list, &sctp_local_addr_list); 98 } 99 break; 100 case NETDEV_DOWN: 101 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 102 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 103 if (ipv6_addr_equal(&addr->a.v6.sin6_addr, &ifa->addr)) { 104 list_del(pos); 105 kfree(addr); 106 break; 107 } 108 } 109 110 break; 111 } 112 113 return NOTIFY_DONE; 114 } 115 116 static struct notifier_block sctp_inet6addr_notifier = { 117 .notifier_call = sctp_inet6addr_event, 118 }; 119 120 /* ICMP error handler. */ 121 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 122 int type, int code, int offset, __be32 info) 123 { 124 struct inet6_dev *idev; 125 struct ipv6hdr *iph = (struct ipv6hdr *)skb->data; 126 struct sctphdr *sh = (struct sctphdr *)(skb->data + offset); 127 struct sock *sk; 128 struct sctp_association *asoc; 129 struct sctp_transport *transport; 130 struct ipv6_pinfo *np; 131 char *saveip, *savesctp; 132 int err; 133 134 idev = in6_dev_get(skb->dev); 135 136 /* Fix up skb to look at the embedded net header. */ 137 saveip = skb->nh.raw; 138 savesctp = skb->h.raw; 139 skb->nh.ipv6h = iph; 140 skb->h.raw = (char *)sh; 141 sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport); 142 /* Put back, the original pointers. */ 143 skb->nh.raw = saveip; 144 skb->h.raw = savesctp; 145 if (!sk) { 146 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 147 goto out; 148 } 149 150 /* Warning: The sock lock is held. Remember to call 151 * sctp_err_finish! 152 */ 153 154 switch (type) { 155 case ICMPV6_PKT_TOOBIG: 156 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); 157 goto out_unlock; 158 case ICMPV6_PARAMPROB: 159 if (ICMPV6_UNK_NEXTHDR == code) { 160 sctp_icmp_proto_unreachable(sk, asoc, transport); 161 goto out_unlock; 162 } 163 break; 164 default: 165 break; 166 } 167 168 np = inet6_sk(sk); 169 icmpv6_err_convert(type, code, &err); 170 if (!sock_owned_by_user(sk) && np->recverr) { 171 sk->sk_err = err; 172 sk->sk_error_report(sk); 173 } else { /* Only an error on timeout */ 174 sk->sk_err_soft = err; 175 } 176 177 out_unlock: 178 sctp_err_finish(sk, asoc); 179 out: 180 if (likely(idev != NULL)) 181 in6_dev_put(idev); 182 } 183 184 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */ 185 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport, 186 int ipfragok) 187 { 188 struct sock *sk = skb->sk; 189 struct ipv6_pinfo *np = inet6_sk(sk); 190 struct flowi fl; 191 192 memset(&fl, 0, sizeof(fl)); 193 194 fl.proto = sk->sk_protocol; 195 196 /* Fill in the dest address from the route entry passed with the skb 197 * and the source address from the transport. 198 */ 199 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr); 200 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr); 201 202 fl.fl6_flowlabel = np->flow_label; 203 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); 204 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL) 205 fl.oif = transport->saddr.v6.sin6_scope_id; 206 else 207 fl.oif = sk->sk_bound_dev_if; 208 209 if (np->opt && np->opt->srcrt) { 210 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 211 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 212 } 213 214 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " 215 "src:" NIP6_FMT " dst:" NIP6_FMT "\n", 216 __FUNCTION__, skb, skb->len, 217 NIP6(fl.fl6_src), NIP6(fl.fl6_dst)); 218 219 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 220 221 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok); 222 } 223 224 /* Returns the dst cache entry for the given source and destination ip 225 * addresses. 226 */ 227 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, 228 union sctp_addr *daddr, 229 union sctp_addr *saddr) 230 { 231 struct dst_entry *dst; 232 struct flowi fl; 233 234 memset(&fl, 0, sizeof(fl)); 235 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); 236 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 237 fl.oif = daddr->v6.sin6_scope_id; 238 239 240 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ", 241 __FUNCTION__, NIP6(fl.fl6_dst)); 242 243 if (saddr) { 244 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); 245 SCTP_DEBUG_PRINTK( 246 "SRC=" NIP6_FMT " - ", 247 NIP6(fl.fl6_src)); 248 } 249 250 dst = ip6_route_output(NULL, &fl); 251 if (!dst->error) { 252 struct rt6_info *rt; 253 rt = (struct rt6_info *)dst; 254 SCTP_DEBUG_PRINTK( 255 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n", 256 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr)); 257 return dst; 258 } 259 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 260 dst_release(dst); 261 return NULL; 262 } 263 264 /* Returns the number of consecutive initial bits that match in the 2 ipv6 265 * addresses. 266 */ 267 static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 268 union sctp_addr *s2) 269 { 270 struct in6_addr *a1 = &s1->v6.sin6_addr; 271 struct in6_addr *a2 = &s2->v6.sin6_addr; 272 int i, j; 273 274 for (i = 0; i < 4 ; i++) { 275 __be32 a1xora2; 276 277 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; 278 279 if ((j = fls(ntohl(a1xora2)))) 280 return (i * 32 + 32 - j); 281 } 282 283 return (i*32); 284 } 285 286 /* Fills in the source address(saddr) based on the destination address(daddr) 287 * and asoc's bind address list. 288 */ 289 static void sctp_v6_get_saddr(struct sctp_association *asoc, 290 struct dst_entry *dst, 291 union sctp_addr *daddr, 292 union sctp_addr *saddr) 293 { 294 struct sctp_bind_addr *bp; 295 rwlock_t *addr_lock; 296 struct sctp_sockaddr_entry *laddr; 297 struct list_head *pos; 298 sctp_scope_t scope; 299 union sctp_addr *baddr = NULL; 300 __u8 matchlen = 0; 301 __u8 bmatchlen; 302 303 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p " 304 "daddr:" NIP6_FMT " ", 305 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr)); 306 307 if (!asoc) { 308 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr); 309 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n", 310 NIP6(saddr->v6.sin6_addr)); 311 return; 312 } 313 314 scope = sctp_scope(daddr); 315 316 bp = &asoc->base.bind_addr; 317 addr_lock = &asoc->base.addr_lock; 318 319 /* Go through the bind address list and find the best source address 320 * that matches the scope of the destination address. 321 */ 322 sctp_read_lock(addr_lock); 323 list_for_each(pos, &bp->address_list) { 324 laddr = list_entry(pos, struct sctp_sockaddr_entry, list); 325 if ((laddr->use_as_src) && 326 (laddr->a.sa.sa_family == AF_INET6) && 327 (scope <= sctp_scope(&laddr->a))) { 328 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 329 if (!baddr || (matchlen < bmatchlen)) { 330 baddr = &laddr->a; 331 matchlen = bmatchlen; 332 } 333 } 334 } 335 336 if (baddr) { 337 memcpy(saddr, baddr, sizeof(union sctp_addr)); 338 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n", 339 NIP6(saddr->v6.sin6_addr)); 340 } else { 341 printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 342 "address for the dest:" NIP6_FMT "\n", 343 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr)); 344 } 345 346 sctp_read_unlock(addr_lock); 347 } 348 349 /* Make a copy of all potential local addresses. */ 350 static void sctp_v6_copy_addrlist(struct list_head *addrlist, 351 struct net_device *dev) 352 { 353 struct inet6_dev *in6_dev; 354 struct inet6_ifaddr *ifp; 355 struct sctp_sockaddr_entry *addr; 356 357 rcu_read_lock(); 358 if ((in6_dev = __in6_dev_get(dev)) == NULL) { 359 rcu_read_unlock(); 360 return; 361 } 362 363 read_lock_bh(&in6_dev->lock); 364 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { 365 /* Add the address to the local list. */ 366 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 367 if (addr) { 368 addr->a.v6.sin6_family = AF_INET6; 369 addr->a.v6.sin6_port = 0; 370 addr->a.v6.sin6_addr = ifp->addr; 371 addr->a.v6.sin6_scope_id = dev->ifindex; 372 INIT_LIST_HEAD(&addr->list); 373 list_add_tail(&addr->list, addrlist); 374 } 375 } 376 377 read_unlock_bh(&in6_dev->lock); 378 rcu_read_unlock(); 379 } 380 381 /* Initialize a sockaddr_storage from in incoming skb. */ 382 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 383 int is_saddr) 384 { 385 void *from; 386 __be16 *port; 387 struct sctphdr *sh; 388 389 port = &addr->v6.sin6_port; 390 addr->v6.sin6_family = AF_INET6; 391 addr->v6.sin6_flowinfo = 0; /* FIXME */ 392 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 393 394 sh = (struct sctphdr *) skb->h.raw; 395 if (is_saddr) { 396 *port = sh->source; 397 from = &skb->nh.ipv6h->saddr; 398 } else { 399 *port = sh->dest; 400 from = &skb->nh.ipv6h->daddr; 401 } 402 ipv6_addr_copy(&addr->v6.sin6_addr, from); 403 } 404 405 /* Initialize an sctp_addr from a socket. */ 406 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 407 { 408 addr->v6.sin6_family = AF_INET6; 409 addr->v6.sin6_port = 0; 410 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 411 } 412 413 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 414 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 415 { 416 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 417 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 418 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 419 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 420 inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 421 addr->v4.sin_addr.s_addr; 422 } else { 423 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 424 } 425 } 426 427 /* Initialize sk->sk_daddr from sctp_addr. */ 428 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 429 { 430 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 431 inet6_sk(sk)->daddr.s6_addr32[0] = 0; 432 inet6_sk(sk)->daddr.s6_addr32[1] = 0; 433 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 434 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 435 } else { 436 inet6_sk(sk)->daddr = addr->v6.sin6_addr; 437 } 438 } 439 440 /* Initialize a sctp_addr from an address parameter. */ 441 static void sctp_v6_from_addr_param(union sctp_addr *addr, 442 union sctp_addr_param *param, 443 __be16 port, int iif) 444 { 445 addr->v6.sin6_family = AF_INET6; 446 addr->v6.sin6_port = port; 447 addr->v6.sin6_flowinfo = 0; /* BUG */ 448 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 449 addr->v6.sin6_scope_id = iif; 450 } 451 452 /* Initialize an address parameter from a sctp_addr and return the length 453 * of the address parameter. 454 */ 455 static int sctp_v6_to_addr_param(const union sctp_addr *addr, 456 union sctp_addr_param *param) 457 { 458 int length = sizeof(sctp_ipv6addr_param_t); 459 460 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 461 param->v6.param_hdr.length = htons(length); 462 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 463 464 return length; 465 } 466 467 /* Initialize a sctp_addr from a dst_entry. */ 468 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 469 __be16 port) 470 { 471 struct rt6_info *rt = (struct rt6_info *)dst; 472 addr->sa.sa_family = AF_INET6; 473 addr->v6.sin6_port = port; 474 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 475 } 476 477 /* Compare addresses exactly. 478 * v4-mapped-v6 is also in consideration. 479 */ 480 static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 481 const union sctp_addr *addr2) 482 { 483 if (addr1->sa.sa_family != addr2->sa.sa_family) { 484 if (addr1->sa.sa_family == AF_INET && 485 addr2->sa.sa_family == AF_INET6 && 486 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) { 487 if (addr2->v6.sin6_port == addr1->v4.sin_port && 488 addr2->v6.sin6_addr.s6_addr32[3] == 489 addr1->v4.sin_addr.s_addr) 490 return 1; 491 } 492 if (addr2->sa.sa_family == AF_INET && 493 addr1->sa.sa_family == AF_INET6 && 494 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) { 495 if (addr1->v6.sin6_port == addr2->v4.sin_port && 496 addr1->v6.sin6_addr.s6_addr32[3] == 497 addr2->v4.sin_addr.s_addr) 498 return 1; 499 } 500 return 0; 501 } 502 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 503 return 0; 504 /* If this is a linklocal address, compare the scope_id. */ 505 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 506 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 507 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 508 return 0; 509 } 510 } 511 512 return 1; 513 } 514 515 /* Initialize addr struct to INADDR_ANY. */ 516 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) 517 { 518 memset(addr, 0x00, sizeof(union sctp_addr)); 519 addr->v6.sin6_family = AF_INET6; 520 addr->v6.sin6_port = port; 521 } 522 523 /* Is this a wildcard address? */ 524 static int sctp_v6_is_any(const union sctp_addr *addr) 525 { 526 return ipv6_addr_any(&addr->v6.sin6_addr); 527 } 528 529 /* Should this be available for binding? */ 530 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 531 { 532 int type; 533 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 534 535 type = ipv6_addr_type(in6); 536 if (IPV6_ADDR_ANY == type) 537 return 1; 538 if (type == IPV6_ADDR_MAPPED) { 539 if (sp && !sp->v4mapped) 540 return 0; 541 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 542 return 0; 543 sctp_v6_map_v4(addr); 544 return sctp_get_af_specific(AF_INET)->available(addr, sp); 545 } 546 if (!(type & IPV6_ADDR_UNICAST)) 547 return 0; 548 549 return ipv6_chk_addr(in6, NULL, 0); 550 } 551 552 /* This function checks if the address is a valid address to be used for 553 * SCTP. 554 * 555 * Output: 556 * Return 0 - If the address is a non-unicast or an illegal address. 557 * Return 1 - If the address is a unicast. 558 */ 559 static int sctp_v6_addr_valid(union sctp_addr *addr, 560 struct sctp_sock *sp, 561 const struct sk_buff *skb) 562 { 563 int ret = ipv6_addr_type(&addr->v6.sin6_addr); 564 565 /* Support v4-mapped-v6 address. */ 566 if (ret == IPV6_ADDR_MAPPED) { 567 /* Note: This routine is used in input, so v4-mapped-v6 568 * are disallowed here when there is no sctp_sock. 569 */ 570 if (!sp || !sp->v4mapped) 571 return 0; 572 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 573 return 0; 574 sctp_v6_map_v4(addr); 575 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 576 } 577 578 /* Is this a non-unicast address */ 579 if (!(ret & IPV6_ADDR_UNICAST)) 580 return 0; 581 582 return 1; 583 } 584 585 /* What is the scope of 'addr'? */ 586 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 587 { 588 int v6scope; 589 sctp_scope_t retval; 590 591 /* The IPv6 scope is really a set of bit fields. 592 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 593 */ 594 595 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 596 switch (v6scope) { 597 case IFA_HOST: 598 retval = SCTP_SCOPE_LOOPBACK; 599 break; 600 case IFA_LINK: 601 retval = SCTP_SCOPE_LINK; 602 break; 603 case IFA_SITE: 604 retval = SCTP_SCOPE_PRIVATE; 605 break; 606 default: 607 retval = SCTP_SCOPE_GLOBAL; 608 break; 609 }; 610 611 return retval; 612 } 613 614 /* Create and initialize a new sk for the socket to be returned by accept(). */ 615 static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 616 struct sctp_association *asoc) 617 { 618 struct inet_sock *inet = inet_sk(sk); 619 struct sock *newsk; 620 struct inet_sock *newinet; 621 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 622 struct sctp6_sock *newsctp6sk; 623 624 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1); 625 if (!newsk) 626 goto out; 627 628 sock_init_data(NULL, newsk); 629 630 newsk->sk_type = SOCK_STREAM; 631 632 newsk->sk_prot = sk->sk_prot; 633 newsk->sk_no_check = sk->sk_no_check; 634 newsk->sk_reuse = sk->sk_reuse; 635 636 newsk->sk_destruct = inet_sock_destruct; 637 newsk->sk_family = PF_INET6; 638 newsk->sk_protocol = IPPROTO_SCTP; 639 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 640 newsk->sk_shutdown = sk->sk_shutdown; 641 sock_reset_flag(sk, SOCK_ZAPPED); 642 643 newsctp6sk = (struct sctp6_sock *)newsk; 644 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 645 646 newinet = inet_sk(newsk); 647 newnp = inet6_sk(newsk); 648 649 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 650 651 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 652 * and getpeername(). 653 */ 654 newinet->sport = inet->sport; 655 newnp->saddr = np->saddr; 656 newnp->rcv_saddr = np->rcv_saddr; 657 newinet->dport = htons(asoc->peer.port); 658 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 659 660 /* Init the ipv4 part of the socket since we can have sockets 661 * using v6 API for ipv4. 662 */ 663 newinet->uc_ttl = -1; 664 newinet->mc_loop = 1; 665 newinet->mc_ttl = 1; 666 newinet->mc_index = 0; 667 newinet->mc_list = NULL; 668 669 if (ipv4_config.no_pmtu_disc) 670 newinet->pmtudisc = IP_PMTUDISC_DONT; 671 else 672 newinet->pmtudisc = IP_PMTUDISC_WANT; 673 674 sk_refcnt_debug_inc(newsk); 675 676 if (newsk->sk_prot->init(newsk)) { 677 sk_common_release(newsk); 678 newsk = NULL; 679 } 680 681 out: 682 return newsk; 683 } 684 685 /* Map v4 address to mapped v6 address */ 686 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 687 { 688 if (sp->v4mapped && AF_INET == addr->sa.sa_family) 689 sctp_v4_map_v6(addr); 690 } 691 692 /* Where did this skb come from? */ 693 static int sctp_v6_skb_iif(const struct sk_buff *skb) 694 { 695 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 696 return opt->iif; 697 } 698 699 /* Was this packet marked by Explicit Congestion Notification? */ 700 static int sctp_v6_is_ce(const struct sk_buff *skb) 701 { 702 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20); 703 } 704 705 /* Dump the v6 addr to the seq file. */ 706 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 707 { 708 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr)); 709 } 710 711 /* Initialize a PF_INET6 socket msg_name. */ 712 static void sctp_inet6_msgname(char *msgname, int *addr_len) 713 { 714 struct sockaddr_in6 *sin6; 715 716 sin6 = (struct sockaddr_in6 *)msgname; 717 sin6->sin6_family = AF_INET6; 718 sin6->sin6_flowinfo = 0; 719 sin6->sin6_scope_id = 0; /*FIXME */ 720 *addr_len = sizeof(struct sockaddr_in6); 721 } 722 723 /* Initialize a PF_INET msgname from a ulpevent. */ 724 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 725 char *msgname, int *addrlen) 726 { 727 struct sockaddr_in6 *sin6, *sin6from; 728 729 if (msgname) { 730 union sctp_addr *addr; 731 struct sctp_association *asoc; 732 733 asoc = event->asoc; 734 sctp_inet6_msgname(msgname, addrlen); 735 sin6 = (struct sockaddr_in6 *)msgname; 736 sin6->sin6_port = htons(asoc->peer.port); 737 addr = &asoc->peer.primary_addr; 738 739 /* Note: If we go to a common v6 format, this code 740 * will change. 741 */ 742 743 /* Map ipv4 address into v4-mapped-on-v6 address. */ 744 if (sctp_sk(asoc->base.sk)->v4mapped && 745 AF_INET == addr->sa.sa_family) { 746 sctp_v4_map_v6((union sctp_addr *)sin6); 747 sin6->sin6_addr.s6_addr32[3] = 748 addr->v4.sin_addr.s_addr; 749 return; 750 } 751 752 sin6from = &asoc->peer.primary_addr.v6; 753 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 754 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 755 sin6->sin6_scope_id = sin6from->sin6_scope_id; 756 } 757 } 758 759 /* Initialize a msg_name from an inbound skb. */ 760 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 761 int *addr_len) 762 { 763 struct sctphdr *sh; 764 struct sockaddr_in6 *sin6; 765 766 if (msgname) { 767 sctp_inet6_msgname(msgname, addr_len); 768 sin6 = (struct sockaddr_in6 *)msgname; 769 sh = (struct sctphdr *)skb->h.raw; 770 sin6->sin6_port = sh->source; 771 772 /* Map ipv4 address into v4-mapped-on-v6 address. */ 773 if (sctp_sk(skb->sk)->v4mapped && 774 skb->nh.iph->version == 4) { 775 sctp_v4_map_v6((union sctp_addr *)sin6); 776 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr; 777 return; 778 } 779 780 /* Otherwise, just copy the v6 address. */ 781 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 782 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 783 struct sctp_ulpevent *ev = sctp_skb2event(skb); 784 sin6->sin6_scope_id = ev->iif; 785 } 786 } 787 } 788 789 /* Do we support this AF? */ 790 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 791 { 792 switch (family) { 793 case AF_INET6: 794 return 1; 795 /* v4-mapped-v6 addresses */ 796 case AF_INET: 797 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped) 798 return 1; 799 default: 800 return 0; 801 } 802 } 803 804 /* Address matching with wildcards allowed. This extra level 805 * of indirection lets us choose whether a PF_INET6 should 806 * disallow any v4 addresses if we so choose. 807 */ 808 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 809 const union sctp_addr *addr2, 810 struct sctp_sock *opt) 811 { 812 struct sctp_af *af1, *af2; 813 814 af1 = sctp_get_af_specific(addr1->sa.sa_family); 815 af2 = sctp_get_af_specific(addr2->sa.sa_family); 816 817 if (!af1 || !af2) 818 return 0; 819 /* Today, wildcard AF_INET/AF_INET6. */ 820 if (sctp_is_any(addr1) || sctp_is_any(addr2)) 821 return 1; 822 823 if (addr1->sa.sa_family != addr2->sa.sa_family) 824 return 0; 825 826 return af1->cmp_addr(addr1, addr2); 827 } 828 829 /* Verify that the provided sockaddr looks bindable. Common verification, 830 * has already been taken care of. 831 */ 832 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 833 { 834 struct sctp_af *af; 835 836 /* ASSERT: address family has already been verified. */ 837 if (addr->sa.sa_family != AF_INET6) 838 af = sctp_get_af_specific(addr->sa.sa_family); 839 else { 840 int type = ipv6_addr_type(&addr->v6.sin6_addr); 841 struct net_device *dev; 842 843 if (type & IPV6_ADDR_LINKLOCAL) { 844 if (!addr->v6.sin6_scope_id) 845 return 0; 846 dev = dev_get_by_index(addr->v6.sin6_scope_id); 847 if (!dev) 848 return 0; 849 dev_put(dev); 850 } 851 af = opt->pf->af; 852 } 853 return af->available(addr, opt); 854 } 855 856 /* Verify that the provided sockaddr looks sendable. Common verification, 857 * has already been taken care of. 858 */ 859 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 860 { 861 struct sctp_af *af = NULL; 862 863 /* ASSERT: address family has already been verified. */ 864 if (addr->sa.sa_family != AF_INET6) 865 af = sctp_get_af_specific(addr->sa.sa_family); 866 else { 867 int type = ipv6_addr_type(&addr->v6.sin6_addr); 868 struct net_device *dev; 869 870 if (type & IPV6_ADDR_LINKLOCAL) { 871 if (!addr->v6.sin6_scope_id) 872 return 0; 873 dev = dev_get_by_index(addr->v6.sin6_scope_id); 874 if (!dev) 875 return 0; 876 dev_put(dev); 877 } 878 af = opt->pf->af; 879 } 880 881 return af != NULL; 882 } 883 884 /* Fill in Supported Address Type information for INIT and INIT-ACK 885 * chunks. Note: In the future, we may want to look at sock options 886 * to determine whether a PF_INET6 socket really wants to have IPV4 887 * addresses. 888 * Returns number of addresses supported. 889 */ 890 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 891 __be16 *types) 892 { 893 types[0] = SCTP_PARAM_IPV4_ADDRESS; 894 types[1] = SCTP_PARAM_IPV6_ADDRESS; 895 return 2; 896 } 897 898 static const struct proto_ops inet6_seqpacket_ops = { 899 .family = PF_INET6, 900 .owner = THIS_MODULE, 901 .release = inet6_release, 902 .bind = inet6_bind, 903 .connect = inet_dgram_connect, 904 .socketpair = sock_no_socketpair, 905 .accept = inet_accept, 906 .getname = inet6_getname, 907 .poll = sctp_poll, 908 .ioctl = inet6_ioctl, 909 .listen = sctp_inet_listen, 910 .shutdown = inet_shutdown, 911 .setsockopt = sock_common_setsockopt, 912 .getsockopt = sock_common_getsockopt, 913 .sendmsg = inet_sendmsg, 914 .recvmsg = sock_common_recvmsg, 915 .mmap = sock_no_mmap, 916 #ifdef CONFIG_COMPAT 917 .compat_setsockopt = compat_sock_common_setsockopt, 918 .compat_getsockopt = compat_sock_common_getsockopt, 919 #endif 920 }; 921 922 static struct inet_protosw sctpv6_seqpacket_protosw = { 923 .type = SOCK_SEQPACKET, 924 .protocol = IPPROTO_SCTP, 925 .prot = &sctpv6_prot, 926 .ops = &inet6_seqpacket_ops, 927 .capability = -1, 928 .no_check = 0, 929 .flags = SCTP_PROTOSW_FLAG 930 }; 931 static struct inet_protosw sctpv6_stream_protosw = { 932 .type = SOCK_STREAM, 933 .protocol = IPPROTO_SCTP, 934 .prot = &sctpv6_prot, 935 .ops = &inet6_seqpacket_ops, 936 .capability = -1, 937 .no_check = 0, 938 .flags = SCTP_PROTOSW_FLAG, 939 }; 940 941 static int sctp6_rcv(struct sk_buff **pskb) 942 { 943 return sctp_rcv(*pskb) ? -1 : 0; 944 } 945 946 static struct inet6_protocol sctpv6_protocol = { 947 .handler = sctp6_rcv, 948 .err_handler = sctp_v6_err, 949 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 950 }; 951 952 static struct sctp_af sctp_ipv6_specific = { 953 .sa_family = AF_INET6, 954 .sctp_xmit = sctp_v6_xmit, 955 .setsockopt = ipv6_setsockopt, 956 .getsockopt = ipv6_getsockopt, 957 .get_dst = sctp_v6_get_dst, 958 .get_saddr = sctp_v6_get_saddr, 959 .copy_addrlist = sctp_v6_copy_addrlist, 960 .from_skb = sctp_v6_from_skb, 961 .from_sk = sctp_v6_from_sk, 962 .to_sk_saddr = sctp_v6_to_sk_saddr, 963 .to_sk_daddr = sctp_v6_to_sk_daddr, 964 .from_addr_param = sctp_v6_from_addr_param, 965 .to_addr_param = sctp_v6_to_addr_param, 966 .dst_saddr = sctp_v6_dst_saddr, 967 .cmp_addr = sctp_v6_cmp_addr, 968 .scope = sctp_v6_scope, 969 .addr_valid = sctp_v6_addr_valid, 970 .inaddr_any = sctp_v6_inaddr_any, 971 .is_any = sctp_v6_is_any, 972 .available = sctp_v6_available, 973 .skb_iif = sctp_v6_skb_iif, 974 .is_ce = sctp_v6_is_ce, 975 .seq_dump_addr = sctp_v6_seq_dump_addr, 976 .net_header_len = sizeof(struct ipv6hdr), 977 .sockaddr_len = sizeof(struct sockaddr_in6), 978 #ifdef CONFIG_COMPAT 979 .compat_setsockopt = compat_ipv6_setsockopt, 980 .compat_getsockopt = compat_ipv6_getsockopt, 981 #endif 982 }; 983 984 static struct sctp_pf sctp_pf_inet6_specific = { 985 .event_msgname = sctp_inet6_event_msgname, 986 .skb_msgname = sctp_inet6_skb_msgname, 987 .af_supported = sctp_inet6_af_supported, 988 .cmp_addr = sctp_inet6_cmp_addr, 989 .bind_verify = sctp_inet6_bind_verify, 990 .send_verify = sctp_inet6_send_verify, 991 .supported_addrs = sctp_inet6_supported_addrs, 992 .create_accept_sk = sctp_v6_create_accept_sk, 993 .addr_v4map = sctp_v6_addr_v4map, 994 .af = &sctp_ipv6_specific, 995 }; 996 997 /* Initialize IPv6 support and register with inet6 stack. */ 998 int sctp_v6_init(void) 999 { 1000 int rc = proto_register(&sctpv6_prot, 1); 1001 1002 if (rc) 1003 goto out; 1004 /* Register inet6 protocol. */ 1005 rc = -EAGAIN; 1006 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 1007 goto out_unregister_sctp_proto; 1008 1009 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 1010 inet6_register_protosw(&sctpv6_seqpacket_protosw); 1011 inet6_register_protosw(&sctpv6_stream_protosw); 1012 1013 /* Register the SCTP specific PF_INET6 functions. */ 1014 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6); 1015 1016 /* Register the SCTP specific AF_INET6 functions. */ 1017 sctp_register_af(&sctp_ipv6_specific); 1018 1019 /* Register notifier for inet6 address additions/deletions. */ 1020 register_inet6addr_notifier(&sctp_inet6addr_notifier); 1021 rc = 0; 1022 out: 1023 return rc; 1024 out_unregister_sctp_proto: 1025 proto_unregister(&sctpv6_prot); 1026 goto out; 1027 } 1028 1029 /* IPv6 specific exit support. */ 1030 void sctp_v6_exit(void) 1031 { 1032 list_del(&sctp_ipv6_specific.list); 1033 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1034 inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1035 inet6_unregister_protosw(&sctpv6_stream_protosw); 1036 unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 1037 proto_unregister(&sctpv6_prot); 1038 } 1039