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 /* Event handler for inet6 address addition/deletion events. */ 82 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, 83 void *ptr) 84 { 85 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; 86 struct sctp_sockaddr_entry *addr; 87 struct list_head *pos, *temp; 88 89 switch (ev) { 90 case NETDEV_UP: 91 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 92 if (addr) { 93 addr->a.v6.sin6_family = AF_INET6; 94 addr->a.v6.sin6_port = 0; 95 memcpy(&addr->a.v6.sin6_addr, &ifa->addr, 96 sizeof(struct in6_addr)); 97 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; 98 list_add_tail(&addr->list, &sctp_local_addr_list); 99 } 100 break; 101 case NETDEV_DOWN: 102 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 103 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 104 if (ipv6_addr_equal(&addr->a.v6.sin6_addr, &ifa->addr)) { 105 list_del(pos); 106 kfree(addr); 107 break; 108 } 109 } 110 111 break; 112 } 113 114 return NOTIFY_DONE; 115 } 116 117 static struct notifier_block sctp_inet6addr_notifier = { 118 .notifier_call = sctp_inet6addr_event, 119 }; 120 121 /* ICMP error handler. */ 122 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 123 int type, int code, int offset, __be32 info) 124 { 125 struct inet6_dev *idev; 126 struct ipv6hdr *iph = (struct ipv6hdr *)skb->data; 127 struct sctphdr *sh = (struct sctphdr *)(skb->data + offset); 128 struct sock *sk; 129 struct sctp_association *asoc; 130 struct sctp_transport *transport; 131 struct ipv6_pinfo *np; 132 char *saveip, *savesctp; 133 int err; 134 135 idev = in6_dev_get(skb->dev); 136 137 /* Fix up skb to look at the embedded net header. */ 138 saveip = skb->nh.raw; 139 savesctp = skb->h.raw; 140 skb->nh.ipv6h = iph; 141 skb->h.raw = (char *)sh; 142 sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport); 143 /* Put back, the original pointers. */ 144 skb->nh.raw = saveip; 145 skb->h.raw = savesctp; 146 if (!sk) { 147 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 148 goto out; 149 } 150 151 /* Warning: The sock lock is held. Remember to call 152 * sctp_err_finish! 153 */ 154 155 switch (type) { 156 case ICMPV6_PKT_TOOBIG: 157 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); 158 goto out_unlock; 159 case ICMPV6_PARAMPROB: 160 if (ICMPV6_UNK_NEXTHDR == code) { 161 sctp_icmp_proto_unreachable(sk, asoc, transport); 162 goto out_unlock; 163 } 164 break; 165 default: 166 break; 167 } 168 169 np = inet6_sk(sk); 170 icmpv6_err_convert(type, code, &err); 171 if (!sock_owned_by_user(sk) && np->recverr) { 172 sk->sk_err = err; 173 sk->sk_error_report(sk); 174 } else { /* Only an error on timeout */ 175 sk->sk_err_soft = err; 176 } 177 178 out_unlock: 179 sctp_err_finish(sk, asoc); 180 out: 181 if (likely(idev != NULL)) 182 in6_dev_put(idev); 183 } 184 185 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */ 186 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport, 187 int ipfragok) 188 { 189 struct sock *sk = skb->sk; 190 struct ipv6_pinfo *np = inet6_sk(sk); 191 struct flowi fl; 192 193 memset(&fl, 0, sizeof(fl)); 194 195 fl.proto = sk->sk_protocol; 196 197 /* Fill in the dest address from the route entry passed with the skb 198 * and the source address from the transport. 199 */ 200 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr); 201 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr); 202 203 fl.fl6_flowlabel = np->flow_label; 204 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); 205 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL) 206 fl.oif = transport->saddr.v6.sin6_scope_id; 207 else 208 fl.oif = sk->sk_bound_dev_if; 209 210 if (np->opt && np->opt->srcrt) { 211 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 212 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 213 } 214 215 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " 216 "src:" NIP6_FMT " dst:" NIP6_FMT "\n", 217 __FUNCTION__, skb, skb->len, 218 NIP6(fl.fl6_src), NIP6(fl.fl6_dst)); 219 220 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 221 222 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok); 223 } 224 225 /* Returns the dst cache entry for the given source and destination ip 226 * addresses. 227 */ 228 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, 229 union sctp_addr *daddr, 230 union sctp_addr *saddr) 231 { 232 struct dst_entry *dst; 233 struct flowi fl; 234 235 memset(&fl, 0, sizeof(fl)); 236 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); 237 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 238 fl.oif = daddr->v6.sin6_scope_id; 239 240 241 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ", 242 __FUNCTION__, NIP6(fl.fl6_dst)); 243 244 if (saddr) { 245 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); 246 SCTP_DEBUG_PRINTK( 247 "SRC=" NIP6_FMT " - ", 248 NIP6(fl.fl6_src)); 249 } 250 251 dst = ip6_route_output(NULL, &fl); 252 if (!dst->error) { 253 struct rt6_info *rt; 254 rt = (struct rt6_info *)dst; 255 SCTP_DEBUG_PRINTK( 256 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n", 257 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr)); 258 return dst; 259 } 260 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 261 dst_release(dst); 262 return NULL; 263 } 264 265 /* Returns the number of consecutive initial bits that match in the 2 ipv6 266 * addresses. 267 */ 268 static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 269 union sctp_addr *s2) 270 { 271 struct in6_addr *a1 = &s1->v6.sin6_addr; 272 struct in6_addr *a2 = &s2->v6.sin6_addr; 273 int i, j; 274 275 for (i = 0; i < 4 ; i++) { 276 __be32 a1xora2; 277 278 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; 279 280 if ((j = fls(ntohl(a1xora2)))) 281 return (i * 32 + 32 - j); 282 } 283 284 return (i*32); 285 } 286 287 /* Fills in the source address(saddr) based on the destination address(daddr) 288 * and asoc's bind address list. 289 */ 290 static void sctp_v6_get_saddr(struct sctp_association *asoc, 291 struct dst_entry *dst, 292 union sctp_addr *daddr, 293 union sctp_addr *saddr) 294 { 295 struct sctp_bind_addr *bp; 296 rwlock_t *addr_lock; 297 struct sctp_sockaddr_entry *laddr; 298 struct list_head *pos; 299 sctp_scope_t scope; 300 union sctp_addr *baddr = NULL; 301 __u8 matchlen = 0; 302 __u8 bmatchlen; 303 304 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p " 305 "daddr:" NIP6_FMT " ", 306 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr)); 307 308 if (!asoc) { 309 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr); 310 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n", 311 NIP6(saddr->v6.sin6_addr)); 312 return; 313 } 314 315 scope = sctp_scope(daddr); 316 317 bp = &asoc->base.bind_addr; 318 addr_lock = &asoc->base.addr_lock; 319 320 /* Go through the bind address list and find the best source address 321 * that matches the scope of the destination address. 322 */ 323 sctp_read_lock(addr_lock); 324 list_for_each(pos, &bp->address_list) { 325 laddr = list_entry(pos, struct sctp_sockaddr_entry, list); 326 if ((laddr->use_as_src) && 327 (laddr->a.sa.sa_family == AF_INET6) && 328 (scope <= sctp_scope(&laddr->a))) { 329 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 330 if (!baddr || (matchlen < bmatchlen)) { 331 baddr = &laddr->a; 332 matchlen = bmatchlen; 333 } 334 } 335 } 336 337 if (baddr) { 338 memcpy(saddr, baddr, sizeof(union sctp_addr)); 339 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n", 340 NIP6(saddr->v6.sin6_addr)); 341 } else { 342 printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 343 "address for the dest:" NIP6_FMT "\n", 344 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr)); 345 } 346 347 sctp_read_unlock(addr_lock); 348 } 349 350 /* Make a copy of all potential local addresses. */ 351 static void sctp_v6_copy_addrlist(struct list_head *addrlist, 352 struct net_device *dev) 353 { 354 struct inet6_dev *in6_dev; 355 struct inet6_ifaddr *ifp; 356 struct sctp_sockaddr_entry *addr; 357 358 rcu_read_lock(); 359 if ((in6_dev = __in6_dev_get(dev)) == NULL) { 360 rcu_read_unlock(); 361 return; 362 } 363 364 read_lock(&in6_dev->lock); 365 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { 366 /* Add the address to the local list. */ 367 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 368 if (addr) { 369 addr->a.v6.sin6_family = AF_INET6; 370 addr->a.v6.sin6_port = 0; 371 addr->a.v6.sin6_addr = ifp->addr; 372 addr->a.v6.sin6_scope_id = dev->ifindex; 373 INIT_LIST_HEAD(&addr->list); 374 list_add_tail(&addr->list, addrlist); 375 } 376 } 377 378 read_unlock(&in6_dev->lock); 379 rcu_read_unlock(); 380 } 381 382 /* Initialize a sockaddr_storage from in incoming skb. */ 383 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 384 int is_saddr) 385 { 386 void *from; 387 __be16 *port; 388 struct sctphdr *sh; 389 390 port = &addr->v6.sin6_port; 391 addr->v6.sin6_family = AF_INET6; 392 addr->v6.sin6_flowinfo = 0; /* FIXME */ 393 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 394 395 sh = (struct sctphdr *) skb->h.raw; 396 if (is_saddr) { 397 *port = sh->source; 398 from = &skb->nh.ipv6h->saddr; 399 } else { 400 *port = sh->dest; 401 from = &skb->nh.ipv6h->daddr; 402 } 403 ipv6_addr_copy(&addr->v6.sin6_addr, from); 404 } 405 406 /* Initialize an sctp_addr from a socket. */ 407 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 408 { 409 addr->v6.sin6_family = AF_INET6; 410 addr->v6.sin6_port = 0; 411 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 412 } 413 414 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 415 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 416 { 417 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 418 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 419 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 420 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 421 inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 422 addr->v4.sin_addr.s_addr; 423 } else { 424 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 425 } 426 } 427 428 /* Initialize sk->sk_daddr from sctp_addr. */ 429 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 430 { 431 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 432 inet6_sk(sk)->daddr.s6_addr32[0] = 0; 433 inet6_sk(sk)->daddr.s6_addr32[1] = 0; 434 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 435 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 436 } else { 437 inet6_sk(sk)->daddr = addr->v6.sin6_addr; 438 } 439 } 440 441 /* Initialize a sctp_addr from an address parameter. */ 442 static void sctp_v6_from_addr_param(union sctp_addr *addr, 443 union sctp_addr_param *param, 444 __be16 port, int iif) 445 { 446 addr->v6.sin6_family = AF_INET6; 447 addr->v6.sin6_port = port; 448 addr->v6.sin6_flowinfo = 0; /* BUG */ 449 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 450 addr->v6.sin6_scope_id = iif; 451 } 452 453 /* Initialize an address parameter from a sctp_addr and return the length 454 * of the address parameter. 455 */ 456 static int sctp_v6_to_addr_param(const union sctp_addr *addr, 457 union sctp_addr_param *param) 458 { 459 int length = sizeof(sctp_ipv6addr_param_t); 460 461 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 462 param->v6.param_hdr.length = htons(length); 463 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 464 465 return length; 466 } 467 468 /* Initialize a sctp_addr from a dst_entry. */ 469 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 470 __be16 port) 471 { 472 struct rt6_info *rt = (struct rt6_info *)dst; 473 addr->sa.sa_family = AF_INET6; 474 addr->v6.sin6_port = port; 475 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 476 } 477 478 /* Compare addresses exactly. 479 * v4-mapped-v6 is also in consideration. 480 */ 481 static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 482 const union sctp_addr *addr2) 483 { 484 if (addr1->sa.sa_family != addr2->sa.sa_family) { 485 if (addr1->sa.sa_family == AF_INET && 486 addr2->sa.sa_family == AF_INET6 && 487 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) { 488 if (addr2->v6.sin6_port == addr1->v4.sin_port && 489 addr2->v6.sin6_addr.s6_addr32[3] == 490 addr1->v4.sin_addr.s_addr) 491 return 1; 492 } 493 if (addr2->sa.sa_family == AF_INET && 494 addr1->sa.sa_family == AF_INET6 && 495 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) { 496 if (addr1->v6.sin6_port == addr2->v4.sin_port && 497 addr1->v6.sin6_addr.s6_addr32[3] == 498 addr2->v4.sin_addr.s_addr) 499 return 1; 500 } 501 return 0; 502 } 503 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 504 return 0; 505 /* If this is a linklocal address, compare the scope_id. */ 506 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 507 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 508 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 509 return 0; 510 } 511 } 512 513 return 1; 514 } 515 516 /* Initialize addr struct to INADDR_ANY. */ 517 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) 518 { 519 memset(addr, 0x00, sizeof(union sctp_addr)); 520 addr->v6.sin6_family = AF_INET6; 521 addr->v6.sin6_port = port; 522 } 523 524 /* Is this a wildcard address? */ 525 static int sctp_v6_is_any(const union sctp_addr *addr) 526 { 527 return ipv6_addr_any(&addr->v6.sin6_addr); 528 } 529 530 /* Should this be available for binding? */ 531 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 532 { 533 int type; 534 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 535 536 type = ipv6_addr_type(in6); 537 if (IPV6_ADDR_ANY == type) 538 return 1; 539 if (type == IPV6_ADDR_MAPPED) { 540 if (sp && !sp->v4mapped) 541 return 0; 542 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 543 return 0; 544 sctp_v6_map_v4(addr); 545 return sctp_get_af_specific(AF_INET)->available(addr, sp); 546 } 547 if (!(type & IPV6_ADDR_UNICAST)) 548 return 0; 549 550 return ipv6_chk_addr(in6, NULL, 0); 551 } 552 553 /* This function checks if the address is a valid address to be used for 554 * SCTP. 555 * 556 * Output: 557 * Return 0 - If the address is a non-unicast or an illegal address. 558 * Return 1 - If the address is a unicast. 559 */ 560 static int sctp_v6_addr_valid(union sctp_addr *addr, 561 struct sctp_sock *sp, 562 const struct sk_buff *skb) 563 { 564 int ret = ipv6_addr_type(&addr->v6.sin6_addr); 565 566 /* Support v4-mapped-v6 address. */ 567 if (ret == IPV6_ADDR_MAPPED) { 568 /* Note: This routine is used in input, so v4-mapped-v6 569 * are disallowed here when there is no sctp_sock. 570 */ 571 if (!sp || !sp->v4mapped) 572 return 0; 573 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 574 return 0; 575 sctp_v6_map_v4(addr); 576 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 577 } 578 579 /* Is this a non-unicast address */ 580 if (!(ret & IPV6_ADDR_UNICAST)) 581 return 0; 582 583 return 1; 584 } 585 586 /* What is the scope of 'addr'? */ 587 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 588 { 589 int v6scope; 590 sctp_scope_t retval; 591 592 /* The IPv6 scope is really a set of bit fields. 593 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 594 */ 595 596 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 597 switch (v6scope) { 598 case IFA_HOST: 599 retval = SCTP_SCOPE_LOOPBACK; 600 break; 601 case IFA_LINK: 602 retval = SCTP_SCOPE_LINK; 603 break; 604 case IFA_SITE: 605 retval = SCTP_SCOPE_PRIVATE; 606 break; 607 default: 608 retval = SCTP_SCOPE_GLOBAL; 609 break; 610 }; 611 612 return retval; 613 } 614 615 /* Create and initialize a new sk for the socket to be returned by accept(). */ 616 static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 617 struct sctp_association *asoc) 618 { 619 struct inet_sock *inet = inet_sk(sk); 620 struct sock *newsk; 621 struct inet_sock *newinet; 622 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 623 struct sctp6_sock *newsctp6sk; 624 625 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1); 626 if (!newsk) 627 goto out; 628 629 sock_init_data(NULL, newsk); 630 631 newsk->sk_type = SOCK_STREAM; 632 633 newsk->sk_prot = sk->sk_prot; 634 newsk->sk_no_check = sk->sk_no_check; 635 newsk->sk_reuse = sk->sk_reuse; 636 637 newsk->sk_destruct = inet_sock_destruct; 638 newsk->sk_family = PF_INET6; 639 newsk->sk_protocol = IPPROTO_SCTP; 640 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 641 newsk->sk_shutdown = sk->sk_shutdown; 642 sock_reset_flag(sk, SOCK_ZAPPED); 643 644 newsctp6sk = (struct sctp6_sock *)newsk; 645 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 646 647 newinet = inet_sk(newsk); 648 newnp = inet6_sk(newsk); 649 650 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 651 652 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 653 * and getpeername(). 654 */ 655 newinet->sport = inet->sport; 656 newnp->saddr = np->saddr; 657 newnp->rcv_saddr = np->rcv_saddr; 658 newinet->dport = htons(asoc->peer.port); 659 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 660 661 /* Init the ipv4 part of the socket since we can have sockets 662 * using v6 API for ipv4. 663 */ 664 newinet->uc_ttl = -1; 665 newinet->mc_loop = 1; 666 newinet->mc_ttl = 1; 667 newinet->mc_index = 0; 668 newinet->mc_list = NULL; 669 670 if (ipv4_config.no_pmtu_disc) 671 newinet->pmtudisc = IP_PMTUDISC_DONT; 672 else 673 newinet->pmtudisc = IP_PMTUDISC_WANT; 674 675 sk_refcnt_debug_inc(newsk); 676 677 if (newsk->sk_prot->init(newsk)) { 678 sk_common_release(newsk); 679 newsk = NULL; 680 } 681 682 out: 683 return newsk; 684 } 685 686 /* Map v4 address to mapped v6 address */ 687 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 688 { 689 if (sp->v4mapped && AF_INET == addr->sa.sa_family) 690 sctp_v4_map_v6(addr); 691 } 692 693 /* Where did this skb come from? */ 694 static int sctp_v6_skb_iif(const struct sk_buff *skb) 695 { 696 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 697 return opt->iif; 698 } 699 700 /* Was this packet marked by Explicit Congestion Notification? */ 701 static int sctp_v6_is_ce(const struct sk_buff *skb) 702 { 703 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20); 704 } 705 706 /* Dump the v6 addr to the seq file. */ 707 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 708 { 709 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr)); 710 } 711 712 /* Initialize a PF_INET6 socket msg_name. */ 713 static void sctp_inet6_msgname(char *msgname, int *addr_len) 714 { 715 struct sockaddr_in6 *sin6; 716 717 sin6 = (struct sockaddr_in6 *)msgname; 718 sin6->sin6_family = AF_INET6; 719 sin6->sin6_flowinfo = 0; 720 sin6->sin6_scope_id = 0; /*FIXME */ 721 *addr_len = sizeof(struct sockaddr_in6); 722 } 723 724 /* Initialize a PF_INET msgname from a ulpevent. */ 725 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 726 char *msgname, int *addrlen) 727 { 728 struct sockaddr_in6 *sin6, *sin6from; 729 730 if (msgname) { 731 union sctp_addr *addr; 732 struct sctp_association *asoc; 733 734 asoc = event->asoc; 735 sctp_inet6_msgname(msgname, addrlen); 736 sin6 = (struct sockaddr_in6 *)msgname; 737 sin6->sin6_port = htons(asoc->peer.port); 738 addr = &asoc->peer.primary_addr; 739 740 /* Note: If we go to a common v6 format, this code 741 * will change. 742 */ 743 744 /* Map ipv4 address into v4-mapped-on-v6 address. */ 745 if (sctp_sk(asoc->base.sk)->v4mapped && 746 AF_INET == addr->sa.sa_family) { 747 sctp_v4_map_v6((union sctp_addr *)sin6); 748 sin6->sin6_addr.s6_addr32[3] = 749 addr->v4.sin_addr.s_addr; 750 return; 751 } 752 753 sin6from = &asoc->peer.primary_addr.v6; 754 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 755 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 756 sin6->sin6_scope_id = sin6from->sin6_scope_id; 757 } 758 } 759 760 /* Initialize a msg_name from an inbound skb. */ 761 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 762 int *addr_len) 763 { 764 struct sctphdr *sh; 765 struct sockaddr_in6 *sin6; 766 767 if (msgname) { 768 sctp_inet6_msgname(msgname, addr_len); 769 sin6 = (struct sockaddr_in6 *)msgname; 770 sh = (struct sctphdr *)skb->h.raw; 771 sin6->sin6_port = sh->source; 772 773 /* Map ipv4 address into v4-mapped-on-v6 address. */ 774 if (sctp_sk(skb->sk)->v4mapped && 775 skb->nh.iph->version == 4) { 776 sctp_v4_map_v6((union sctp_addr *)sin6); 777 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr; 778 return; 779 } 780 781 /* Otherwise, just copy the v6 address. */ 782 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 783 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 784 struct sctp_ulpevent *ev = sctp_skb2event(skb); 785 sin6->sin6_scope_id = ev->iif; 786 } 787 } 788 } 789 790 /* Do we support this AF? */ 791 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 792 { 793 switch (family) { 794 case AF_INET6: 795 return 1; 796 /* v4-mapped-v6 addresses */ 797 case AF_INET: 798 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped) 799 return 1; 800 default: 801 return 0; 802 } 803 } 804 805 /* Address matching with wildcards allowed. This extra level 806 * of indirection lets us choose whether a PF_INET6 should 807 * disallow any v4 addresses if we so choose. 808 */ 809 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 810 const union sctp_addr *addr2, 811 struct sctp_sock *opt) 812 { 813 struct sctp_af *af1, *af2; 814 815 af1 = sctp_get_af_specific(addr1->sa.sa_family); 816 af2 = sctp_get_af_specific(addr2->sa.sa_family); 817 818 if (!af1 || !af2) 819 return 0; 820 /* Today, wildcard AF_INET/AF_INET6. */ 821 if (sctp_is_any(addr1) || sctp_is_any(addr2)) 822 return 1; 823 824 if (addr1->sa.sa_family != addr2->sa.sa_family) 825 return 0; 826 827 return af1->cmp_addr(addr1, addr2); 828 } 829 830 /* Verify that the provided sockaddr looks bindable. Common verification, 831 * has already been taken care of. 832 */ 833 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 834 { 835 struct sctp_af *af; 836 837 /* ASSERT: address family has already been verified. */ 838 if (addr->sa.sa_family != AF_INET6) 839 af = sctp_get_af_specific(addr->sa.sa_family); 840 else { 841 int type = ipv6_addr_type(&addr->v6.sin6_addr); 842 struct net_device *dev; 843 844 if (type & IPV6_ADDR_LINKLOCAL) { 845 if (!addr->v6.sin6_scope_id) 846 return 0; 847 dev = dev_get_by_index(addr->v6.sin6_scope_id); 848 if (!dev) 849 return 0; 850 dev_put(dev); 851 } 852 af = opt->pf->af; 853 } 854 return af->available(addr, opt); 855 } 856 857 /* Verify that the provided sockaddr looks sendable. Common verification, 858 * has already been taken care of. 859 */ 860 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 861 { 862 struct sctp_af *af = NULL; 863 864 /* ASSERT: address family has already been verified. */ 865 if (addr->sa.sa_family != AF_INET6) 866 af = sctp_get_af_specific(addr->sa.sa_family); 867 else { 868 int type = ipv6_addr_type(&addr->v6.sin6_addr); 869 struct net_device *dev; 870 871 if (type & IPV6_ADDR_LINKLOCAL) { 872 if (!addr->v6.sin6_scope_id) 873 return 0; 874 dev = dev_get_by_index(addr->v6.sin6_scope_id); 875 if (!dev) 876 return 0; 877 dev_put(dev); 878 } 879 af = opt->pf->af; 880 } 881 882 return af != NULL; 883 } 884 885 /* Fill in Supported Address Type information for INIT and INIT-ACK 886 * chunks. Note: In the future, we may want to look at sock options 887 * to determine whether a PF_INET6 socket really wants to have IPV4 888 * addresses. 889 * Returns number of addresses supported. 890 */ 891 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 892 __be16 *types) 893 { 894 types[0] = SCTP_PARAM_IPV4_ADDRESS; 895 types[1] = SCTP_PARAM_IPV6_ADDRESS; 896 return 2; 897 } 898 899 static const struct proto_ops inet6_seqpacket_ops = { 900 .family = PF_INET6, 901 .owner = THIS_MODULE, 902 .release = inet6_release, 903 .bind = inet6_bind, 904 .connect = inet_dgram_connect, 905 .socketpair = sock_no_socketpair, 906 .accept = inet_accept, 907 .getname = inet6_getname, 908 .poll = sctp_poll, 909 .ioctl = inet6_ioctl, 910 .listen = sctp_inet_listen, 911 .shutdown = inet_shutdown, 912 .setsockopt = sock_common_setsockopt, 913 .getsockopt = sock_common_getsockopt, 914 .sendmsg = inet_sendmsg, 915 .recvmsg = sock_common_recvmsg, 916 .mmap = sock_no_mmap, 917 #ifdef CONFIG_COMPAT 918 .compat_setsockopt = compat_sock_common_setsockopt, 919 .compat_getsockopt = compat_sock_common_getsockopt, 920 #endif 921 }; 922 923 static struct inet_protosw sctpv6_seqpacket_protosw = { 924 .type = SOCK_SEQPACKET, 925 .protocol = IPPROTO_SCTP, 926 .prot = &sctpv6_prot, 927 .ops = &inet6_seqpacket_ops, 928 .capability = -1, 929 .no_check = 0, 930 .flags = SCTP_PROTOSW_FLAG 931 }; 932 static struct inet_protosw sctpv6_stream_protosw = { 933 .type = SOCK_STREAM, 934 .protocol = IPPROTO_SCTP, 935 .prot = &sctpv6_prot, 936 .ops = &inet6_seqpacket_ops, 937 .capability = -1, 938 .no_check = 0, 939 .flags = SCTP_PROTOSW_FLAG, 940 }; 941 942 static int sctp6_rcv(struct sk_buff **pskb) 943 { 944 return sctp_rcv(*pskb) ? -1 : 0; 945 } 946 947 static struct inet6_protocol sctpv6_protocol = { 948 .handler = sctp6_rcv, 949 .err_handler = sctp_v6_err, 950 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 951 }; 952 953 static struct sctp_af sctp_ipv6_specific = { 954 .sa_family = AF_INET6, 955 .sctp_xmit = sctp_v6_xmit, 956 .setsockopt = ipv6_setsockopt, 957 .getsockopt = ipv6_getsockopt, 958 .get_dst = sctp_v6_get_dst, 959 .get_saddr = sctp_v6_get_saddr, 960 .copy_addrlist = sctp_v6_copy_addrlist, 961 .from_skb = sctp_v6_from_skb, 962 .from_sk = sctp_v6_from_sk, 963 .to_sk_saddr = sctp_v6_to_sk_saddr, 964 .to_sk_daddr = sctp_v6_to_sk_daddr, 965 .from_addr_param = sctp_v6_from_addr_param, 966 .to_addr_param = sctp_v6_to_addr_param, 967 .dst_saddr = sctp_v6_dst_saddr, 968 .cmp_addr = sctp_v6_cmp_addr, 969 .scope = sctp_v6_scope, 970 .addr_valid = sctp_v6_addr_valid, 971 .inaddr_any = sctp_v6_inaddr_any, 972 .is_any = sctp_v6_is_any, 973 .available = sctp_v6_available, 974 .skb_iif = sctp_v6_skb_iif, 975 .is_ce = sctp_v6_is_ce, 976 .seq_dump_addr = sctp_v6_seq_dump_addr, 977 .net_header_len = sizeof(struct ipv6hdr), 978 .sockaddr_len = sizeof(struct sockaddr_in6), 979 #ifdef CONFIG_COMPAT 980 .compat_setsockopt = compat_ipv6_setsockopt, 981 .compat_getsockopt = compat_ipv6_getsockopt, 982 #endif 983 }; 984 985 static struct sctp_pf sctp_pf_inet6_specific = { 986 .event_msgname = sctp_inet6_event_msgname, 987 .skb_msgname = sctp_inet6_skb_msgname, 988 .af_supported = sctp_inet6_af_supported, 989 .cmp_addr = sctp_inet6_cmp_addr, 990 .bind_verify = sctp_inet6_bind_verify, 991 .send_verify = sctp_inet6_send_verify, 992 .supported_addrs = sctp_inet6_supported_addrs, 993 .create_accept_sk = sctp_v6_create_accept_sk, 994 .addr_v4map = sctp_v6_addr_v4map, 995 .af = &sctp_ipv6_specific, 996 }; 997 998 /* Initialize IPv6 support and register with inet6 stack. */ 999 int sctp_v6_init(void) 1000 { 1001 int rc = proto_register(&sctpv6_prot, 1); 1002 1003 if (rc) 1004 goto out; 1005 /* Register inet6 protocol. */ 1006 rc = -EAGAIN; 1007 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 1008 goto out_unregister_sctp_proto; 1009 1010 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 1011 inet6_register_protosw(&sctpv6_seqpacket_protosw); 1012 inet6_register_protosw(&sctpv6_stream_protosw); 1013 1014 /* Register the SCTP specific PF_INET6 functions. */ 1015 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6); 1016 1017 /* Register the SCTP specific AF_INET6 functions. */ 1018 sctp_register_af(&sctp_ipv6_specific); 1019 1020 /* Register notifier for inet6 address additions/deletions. */ 1021 register_inet6addr_notifier(&sctp_inet6addr_notifier); 1022 rc = 0; 1023 out: 1024 return rc; 1025 out_unregister_sctp_proto: 1026 proto_unregister(&sctpv6_prot); 1027 goto out; 1028 } 1029 1030 /* IPv6 specific exit support. */ 1031 void sctp_v6_exit(void) 1032 { 1033 list_del(&sctp_ipv6_specific.list); 1034 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1035 inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1036 inet6_unregister_protosw(&sctpv6_stream_protosw); 1037 unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 1038 proto_unregister(&sctpv6_prot); 1039 } 1040