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:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x " 184 "dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 185 __FUNCTION__, skb, skb->len, 186 NIP6(fl.fl6_src), NIP6(fl.fl6_dst)); 187 188 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 189 190 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok); 191 } 192 193 /* Returns the dst cache entry for the given source and destination ip 194 * addresses. 195 */ 196 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, 197 union sctp_addr *daddr, 198 union sctp_addr *saddr) 199 { 200 struct dst_entry *dst; 201 struct flowi fl; 202 203 memset(&fl, 0, sizeof(fl)); 204 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); 205 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 206 fl.oif = daddr->v6.sin6_scope_id; 207 208 209 SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", 210 __FUNCTION__, NIP6(fl.fl6_dst)); 211 212 if (saddr) { 213 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); 214 SCTP_DEBUG_PRINTK( 215 "SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x - ", 216 NIP6(fl.fl6_src)); 217 } 218 219 dst = ip6_route_output(NULL, &fl); 220 if (dst) { 221 struct rt6_info *rt; 222 rt = (struct rt6_info *)dst; 223 SCTP_DEBUG_PRINTK( 224 "rt6_dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x " 225 "rt6_src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 226 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr)); 227 } else { 228 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 229 } 230 231 return dst; 232 } 233 234 /* Returns the number of consecutive initial bits that match in the 2 ipv6 235 * addresses. 236 */ 237 static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 238 union sctp_addr *s2) 239 { 240 struct in6_addr *a1 = &s1->v6.sin6_addr; 241 struct in6_addr *a2 = &s2->v6.sin6_addr; 242 int i, j; 243 244 for (i = 0; i < 4 ; i++) { 245 __u32 a1xora2; 246 247 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; 248 249 if ((j = fls(ntohl(a1xora2)))) 250 return (i * 32 + 32 - j); 251 } 252 253 return (i*32); 254 } 255 256 /* Fills in the source address(saddr) based on the destination address(daddr) 257 * and asoc's bind address list. 258 */ 259 static void sctp_v6_get_saddr(struct sctp_association *asoc, 260 struct dst_entry *dst, 261 union sctp_addr *daddr, 262 union sctp_addr *saddr) 263 { 264 struct sctp_bind_addr *bp; 265 rwlock_t *addr_lock; 266 struct sctp_sockaddr_entry *laddr; 267 struct list_head *pos; 268 sctp_scope_t scope; 269 union sctp_addr *baddr = NULL; 270 __u8 matchlen = 0; 271 __u8 bmatchlen; 272 273 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p " 274 "daddr:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", 275 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr)); 276 277 if (!asoc) { 278 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr); 279 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " 280 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 281 NIP6(saddr->v6.sin6_addr)); 282 return; 283 } 284 285 scope = sctp_scope(daddr); 286 287 bp = &asoc->base.bind_addr; 288 addr_lock = &asoc->base.addr_lock; 289 290 /* Go through the bind address list and find the best source address 291 * that matches the scope of the destination address. 292 */ 293 sctp_read_lock(addr_lock); 294 list_for_each(pos, &bp->address_list) { 295 laddr = list_entry(pos, struct sctp_sockaddr_entry, list); 296 if ((laddr->a.sa.sa_family == AF_INET6) && 297 (scope <= sctp_scope(&laddr->a))) { 298 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 299 if (!baddr || (matchlen < bmatchlen)) { 300 baddr = &laddr->a; 301 matchlen = bmatchlen; 302 } 303 } 304 } 305 306 if (baddr) { 307 memcpy(saddr, baddr, sizeof(union sctp_addr)); 308 SCTP_DEBUG_PRINTK("saddr: " 309 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 310 NIP6(saddr->v6.sin6_addr)); 311 } else { 312 printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 313 "address for the " 314 "dest:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", 315 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr)); 316 } 317 318 sctp_read_unlock(addr_lock); 319 } 320 321 /* Make a copy of all potential local addresses. */ 322 static void sctp_v6_copy_addrlist(struct list_head *addrlist, 323 struct net_device *dev) 324 { 325 struct inet6_dev *in6_dev; 326 struct inet6_ifaddr *ifp; 327 struct sctp_sockaddr_entry *addr; 328 329 read_lock(&addrconf_lock); 330 if ((in6_dev = __in6_dev_get(dev)) == NULL) { 331 read_unlock(&addrconf_lock); 332 return; 333 } 334 335 read_lock(&in6_dev->lock); 336 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { 337 /* Add the address to the local list. */ 338 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 339 if (addr) { 340 addr->a.v6.sin6_family = AF_INET6; 341 addr->a.v6.sin6_port = 0; 342 addr->a.v6.sin6_addr = ifp->addr; 343 addr->a.v6.sin6_scope_id = dev->ifindex; 344 INIT_LIST_HEAD(&addr->list); 345 list_add_tail(&addr->list, addrlist); 346 } 347 } 348 349 read_unlock(&in6_dev->lock); 350 read_unlock(&addrconf_lock); 351 } 352 353 /* Initialize a sockaddr_storage from in incoming skb. */ 354 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 355 int is_saddr) 356 { 357 void *from; 358 __u16 *port; 359 struct sctphdr *sh; 360 361 port = &addr->v6.sin6_port; 362 addr->v6.sin6_family = AF_INET6; 363 addr->v6.sin6_flowinfo = 0; /* FIXME */ 364 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 365 366 sh = (struct sctphdr *) skb->h.raw; 367 if (is_saddr) { 368 *port = ntohs(sh->source); 369 from = &skb->nh.ipv6h->saddr; 370 } else { 371 *port = ntohs(sh->dest); 372 from = &skb->nh.ipv6h->daddr; 373 } 374 ipv6_addr_copy(&addr->v6.sin6_addr, from); 375 } 376 377 /* Initialize an sctp_addr from a socket. */ 378 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 379 { 380 addr->v6.sin6_family = AF_INET6; 381 addr->v6.sin6_port = inet_sk(sk)->num; 382 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 383 } 384 385 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 386 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 387 { 388 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 389 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 390 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 391 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 392 inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 393 addr->v4.sin_addr.s_addr; 394 } else { 395 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 396 } 397 } 398 399 /* Initialize sk->sk_daddr from sctp_addr. */ 400 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 401 { 402 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 403 inet6_sk(sk)->daddr.s6_addr32[0] = 0; 404 inet6_sk(sk)->daddr.s6_addr32[1] = 0; 405 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 406 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 407 } else { 408 inet6_sk(sk)->daddr = addr->v6.sin6_addr; 409 } 410 } 411 412 /* Initialize a sctp_addr from an address parameter. */ 413 static void sctp_v6_from_addr_param(union sctp_addr *addr, 414 union sctp_addr_param *param, 415 __u16 port, int iif) 416 { 417 addr->v6.sin6_family = AF_INET6; 418 addr->v6.sin6_port = port; 419 addr->v6.sin6_flowinfo = 0; /* BUG */ 420 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 421 addr->v6.sin6_scope_id = iif; 422 } 423 424 /* Initialize an address parameter from a sctp_addr and return the length 425 * of the address parameter. 426 */ 427 static int sctp_v6_to_addr_param(const union sctp_addr *addr, 428 union sctp_addr_param *param) 429 { 430 int length = sizeof(sctp_ipv6addr_param_t); 431 432 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 433 param->v6.param_hdr.length = ntohs(length); 434 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 435 436 return length; 437 } 438 439 /* Initialize a sctp_addr from a dst_entry. */ 440 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 441 unsigned short port) 442 { 443 struct rt6_info *rt = (struct rt6_info *)dst; 444 addr->sa.sa_family = AF_INET6; 445 addr->v6.sin6_port = port; 446 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 447 } 448 449 /* Compare addresses exactly. 450 * v4-mapped-v6 is also in consideration. 451 */ 452 static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 453 const union sctp_addr *addr2) 454 { 455 if (addr1->sa.sa_family != addr2->sa.sa_family) { 456 if (addr1->sa.sa_family == AF_INET && 457 addr2->sa.sa_family == AF_INET6 && 458 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) { 459 if (addr2->v6.sin6_port == addr1->v4.sin_port && 460 addr2->v6.sin6_addr.s6_addr32[3] == 461 addr1->v4.sin_addr.s_addr) 462 return 1; 463 } 464 if (addr2->sa.sa_family == AF_INET && 465 addr1->sa.sa_family == AF_INET6 && 466 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) { 467 if (addr1->v6.sin6_port == addr2->v4.sin_port && 468 addr1->v6.sin6_addr.s6_addr32[3] == 469 addr2->v4.sin_addr.s_addr) 470 return 1; 471 } 472 return 0; 473 } 474 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 475 return 0; 476 /* If this is a linklocal address, compare the scope_id. */ 477 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 478 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 479 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 480 return 0; 481 } 482 } 483 484 return 1; 485 } 486 487 /* Initialize addr struct to INADDR_ANY. */ 488 static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port) 489 { 490 memset(addr, 0x00, sizeof(union sctp_addr)); 491 addr->v6.sin6_family = AF_INET6; 492 addr->v6.sin6_port = port; 493 } 494 495 /* Is this a wildcard address? */ 496 static int sctp_v6_is_any(const union sctp_addr *addr) 497 { 498 return ipv6_addr_any(&addr->v6.sin6_addr); 499 } 500 501 /* Should this be available for binding? */ 502 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 503 { 504 int type; 505 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 506 507 type = ipv6_addr_type(in6); 508 if (IPV6_ADDR_ANY == type) 509 return 1; 510 if (type == IPV6_ADDR_MAPPED) { 511 if (sp && !sp->v4mapped) 512 return 0; 513 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 514 return 0; 515 sctp_v6_map_v4(addr); 516 return sctp_get_af_specific(AF_INET)->available(addr, sp); 517 } 518 if (!(type & IPV6_ADDR_UNICAST)) 519 return 0; 520 521 return ipv6_chk_addr(in6, NULL, 0); 522 } 523 524 /* This function checks if the address is a valid address to be used for 525 * SCTP. 526 * 527 * Output: 528 * Return 0 - If the address is a non-unicast or an illegal address. 529 * Return 1 - If the address is a unicast. 530 */ 531 static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_sock *sp) 532 { 533 int ret = ipv6_addr_type(&addr->v6.sin6_addr); 534 535 /* Support v4-mapped-v6 address. */ 536 if (ret == IPV6_ADDR_MAPPED) { 537 /* Note: This routine is used in input, so v4-mapped-v6 538 * are disallowed here when there is no sctp_sock. 539 */ 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)->addr_valid(addr, sp); 546 } 547 548 /* Is this a non-unicast address */ 549 if (!(ret & IPV6_ADDR_UNICAST)) 550 return 0; 551 552 return 1; 553 } 554 555 /* What is the scope of 'addr'? */ 556 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 557 { 558 int v6scope; 559 sctp_scope_t retval; 560 561 /* The IPv6 scope is really a set of bit fields. 562 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 563 */ 564 565 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 566 switch (v6scope) { 567 case IFA_HOST: 568 retval = SCTP_SCOPE_LOOPBACK; 569 break; 570 case IFA_LINK: 571 retval = SCTP_SCOPE_LINK; 572 break; 573 case IFA_SITE: 574 retval = SCTP_SCOPE_PRIVATE; 575 break; 576 default: 577 retval = SCTP_SCOPE_GLOBAL; 578 break; 579 }; 580 581 return retval; 582 } 583 584 /* Create and initialize a new sk for the socket to be returned by accept(). */ 585 static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 586 struct sctp_association *asoc) 587 { 588 struct inet_sock *inet = inet_sk(sk); 589 struct sock *newsk; 590 struct inet_sock *newinet; 591 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 592 struct sctp6_sock *newsctp6sk; 593 594 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1); 595 if (!newsk) 596 goto out; 597 598 sock_init_data(NULL, newsk); 599 600 newsk->sk_type = SOCK_STREAM; 601 602 newsk->sk_prot = sk->sk_prot; 603 newsk->sk_no_check = sk->sk_no_check; 604 newsk->sk_reuse = sk->sk_reuse; 605 606 newsk->sk_destruct = inet_sock_destruct; 607 newsk->sk_family = PF_INET6; 608 newsk->sk_protocol = IPPROTO_SCTP; 609 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 610 newsk->sk_shutdown = sk->sk_shutdown; 611 sock_reset_flag(sk, SOCK_ZAPPED); 612 613 newsctp6sk = (struct sctp6_sock *)newsk; 614 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 615 616 newinet = inet_sk(newsk); 617 newnp = inet6_sk(newsk); 618 619 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 620 621 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 622 * and getpeername(). 623 */ 624 newinet->sport = inet->sport; 625 newnp->saddr = np->saddr; 626 newnp->rcv_saddr = np->rcv_saddr; 627 newinet->dport = htons(asoc->peer.port); 628 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 629 630 /* Init the ipv4 part of the socket since we can have sockets 631 * using v6 API for ipv4. 632 */ 633 newinet->uc_ttl = -1; 634 newinet->mc_loop = 1; 635 newinet->mc_ttl = 1; 636 newinet->mc_index = 0; 637 newinet->mc_list = NULL; 638 639 if (ipv4_config.no_pmtu_disc) 640 newinet->pmtudisc = IP_PMTUDISC_DONT; 641 else 642 newinet->pmtudisc = IP_PMTUDISC_WANT; 643 644 sk_refcnt_debug_inc(newsk); 645 646 if (newsk->sk_prot->init(newsk)) { 647 sk_common_release(newsk); 648 newsk = NULL; 649 } 650 651 out: 652 return newsk; 653 } 654 655 /* Map v4 address to mapped v6 address */ 656 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 657 { 658 if (sp->v4mapped && AF_INET == addr->sa.sa_family) 659 sctp_v4_map_v6(addr); 660 } 661 662 /* Where did this skb come from? */ 663 static int sctp_v6_skb_iif(const struct sk_buff *skb) 664 { 665 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 666 return opt->iif; 667 } 668 669 /* Was this packet marked by Explicit Congestion Notification? */ 670 static int sctp_v6_is_ce(const struct sk_buff *skb) 671 { 672 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20); 673 } 674 675 /* Dump the v6 addr to the seq file. */ 676 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 677 { 678 seq_printf(seq, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", 679 NIP6(addr->v6.sin6_addr)); 680 } 681 682 /* Initialize a PF_INET6 socket msg_name. */ 683 static void sctp_inet6_msgname(char *msgname, int *addr_len) 684 { 685 struct sockaddr_in6 *sin6; 686 687 sin6 = (struct sockaddr_in6 *)msgname; 688 sin6->sin6_family = AF_INET6; 689 sin6->sin6_flowinfo = 0; 690 sin6->sin6_scope_id = 0; /*FIXME */ 691 *addr_len = sizeof(struct sockaddr_in6); 692 } 693 694 /* Initialize a PF_INET msgname from a ulpevent. */ 695 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 696 char *msgname, int *addrlen) 697 { 698 struct sockaddr_in6 *sin6, *sin6from; 699 700 if (msgname) { 701 union sctp_addr *addr; 702 struct sctp_association *asoc; 703 704 asoc = event->asoc; 705 sctp_inet6_msgname(msgname, addrlen); 706 sin6 = (struct sockaddr_in6 *)msgname; 707 sin6->sin6_port = htons(asoc->peer.port); 708 addr = &asoc->peer.primary_addr; 709 710 /* Note: If we go to a common v6 format, this code 711 * will change. 712 */ 713 714 /* Map ipv4 address into v4-mapped-on-v6 address. */ 715 if (sctp_sk(asoc->base.sk)->v4mapped && 716 AF_INET == addr->sa.sa_family) { 717 sctp_v4_map_v6((union sctp_addr *)sin6); 718 sin6->sin6_addr.s6_addr32[3] = 719 addr->v4.sin_addr.s_addr; 720 return; 721 } 722 723 sin6from = &asoc->peer.primary_addr.v6; 724 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 725 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 726 sin6->sin6_scope_id = sin6from->sin6_scope_id; 727 } 728 } 729 730 /* Initialize a msg_name from an inbound skb. */ 731 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 732 int *addr_len) 733 { 734 struct sctphdr *sh; 735 struct sockaddr_in6 *sin6; 736 737 if (msgname) { 738 sctp_inet6_msgname(msgname, addr_len); 739 sin6 = (struct sockaddr_in6 *)msgname; 740 sh = (struct sctphdr *)skb->h.raw; 741 sin6->sin6_port = sh->source; 742 743 /* Map ipv4 address into v4-mapped-on-v6 address. */ 744 if (sctp_sk(skb->sk)->v4mapped && 745 skb->nh.iph->version == 4) { 746 sctp_v4_map_v6((union sctp_addr *)sin6); 747 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr; 748 return; 749 } 750 751 /* Otherwise, just copy the v6 address. */ 752 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); 753 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 754 struct sctp_ulpevent *ev = sctp_skb2event(skb); 755 sin6->sin6_scope_id = ev->iif; 756 } 757 } 758 } 759 760 /* Do we support this AF? */ 761 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 762 { 763 switch (family) { 764 case AF_INET6: 765 return 1; 766 /* v4-mapped-v6 addresses */ 767 case AF_INET: 768 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped) 769 return 1; 770 default: 771 return 0; 772 } 773 } 774 775 /* Address matching with wildcards allowed. This extra level 776 * of indirection lets us choose whether a PF_INET6 should 777 * disallow any v4 addresses if we so choose. 778 */ 779 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 780 const union sctp_addr *addr2, 781 struct sctp_sock *opt) 782 { 783 struct sctp_af *af1, *af2; 784 785 af1 = sctp_get_af_specific(addr1->sa.sa_family); 786 af2 = sctp_get_af_specific(addr2->sa.sa_family); 787 788 if (!af1 || !af2) 789 return 0; 790 /* Today, wildcard AF_INET/AF_INET6. */ 791 if (sctp_is_any(addr1) || sctp_is_any(addr2)) 792 return 1; 793 794 if (addr1->sa.sa_family != addr2->sa.sa_family) 795 return 0; 796 797 return af1->cmp_addr(addr1, addr2); 798 } 799 800 /* Verify that the provided sockaddr looks bindable. Common verification, 801 * has already been taken care of. 802 */ 803 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 804 { 805 struct sctp_af *af; 806 807 /* ASSERT: address family has already been verified. */ 808 if (addr->sa.sa_family != AF_INET6) 809 af = sctp_get_af_specific(addr->sa.sa_family); 810 else { 811 int type = ipv6_addr_type(&addr->v6.sin6_addr); 812 struct net_device *dev; 813 814 if (type & IPV6_ADDR_LINKLOCAL) { 815 if (!addr->v6.sin6_scope_id) 816 return 0; 817 dev = dev_get_by_index(addr->v6.sin6_scope_id); 818 if (!dev) 819 return 0; 820 dev_put(dev); 821 } 822 af = opt->pf->af; 823 } 824 return af->available(addr, opt); 825 } 826 827 /* Verify that the provided sockaddr looks sendable. Common verification, 828 * has already been taken care of. 829 */ 830 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 831 { 832 struct sctp_af *af = NULL; 833 834 /* ASSERT: address family has already been verified. */ 835 if (addr->sa.sa_family != AF_INET6) 836 af = sctp_get_af_specific(addr->sa.sa_family); 837 else { 838 int type = ipv6_addr_type(&addr->v6.sin6_addr); 839 struct net_device *dev; 840 841 if (type & IPV6_ADDR_LINKLOCAL) { 842 if (!addr->v6.sin6_scope_id) 843 return 0; 844 dev = dev_get_by_index(addr->v6.sin6_scope_id); 845 if (!dev) 846 return 0; 847 dev_put(dev); 848 } 849 af = opt->pf->af; 850 } 851 852 return af != NULL; 853 } 854 855 /* Fill in Supported Address Type information for INIT and INIT-ACK 856 * chunks. Note: In the future, we may want to look at sock options 857 * to determine whether a PF_INET6 socket really wants to have IPV4 858 * addresses. 859 * Returns number of addresses supported. 860 */ 861 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 862 __u16 *types) 863 { 864 types[0] = SCTP_PARAM_IPV4_ADDRESS; 865 types[1] = SCTP_PARAM_IPV6_ADDRESS; 866 return 2; 867 } 868 869 static struct proto_ops inet6_seqpacket_ops = { 870 .family = PF_INET6, 871 .owner = THIS_MODULE, 872 .release = inet6_release, 873 .bind = inet6_bind, 874 .connect = inet_dgram_connect, 875 .socketpair = sock_no_socketpair, 876 .accept = inet_accept, 877 .getname = inet6_getname, 878 .poll = sctp_poll, 879 .ioctl = inet6_ioctl, 880 .listen = sctp_inet_listen, 881 .shutdown = inet_shutdown, 882 .setsockopt = sock_common_setsockopt, 883 .getsockopt = sock_common_getsockopt, 884 .sendmsg = inet_sendmsg, 885 .recvmsg = sock_common_recvmsg, 886 .mmap = sock_no_mmap, 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, unsigned int *nhoffp) 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 .sctp_xmit = sctp_v6_xmit, 921 .setsockopt = ipv6_setsockopt, 922 .getsockopt = ipv6_getsockopt, 923 .get_dst = sctp_v6_get_dst, 924 .get_saddr = sctp_v6_get_saddr, 925 .copy_addrlist = sctp_v6_copy_addrlist, 926 .from_skb = sctp_v6_from_skb, 927 .from_sk = sctp_v6_from_sk, 928 .to_sk_saddr = sctp_v6_to_sk_saddr, 929 .to_sk_daddr = sctp_v6_to_sk_daddr, 930 .from_addr_param = sctp_v6_from_addr_param, 931 .to_addr_param = sctp_v6_to_addr_param, 932 .dst_saddr = sctp_v6_dst_saddr, 933 .cmp_addr = sctp_v6_cmp_addr, 934 .scope = sctp_v6_scope, 935 .addr_valid = sctp_v6_addr_valid, 936 .inaddr_any = sctp_v6_inaddr_any, 937 .is_any = sctp_v6_is_any, 938 .available = sctp_v6_available, 939 .skb_iif = sctp_v6_skb_iif, 940 .is_ce = sctp_v6_is_ce, 941 .seq_dump_addr = sctp_v6_seq_dump_addr, 942 .net_header_len = sizeof(struct ipv6hdr), 943 .sockaddr_len = sizeof(struct sockaddr_in6), 944 .sa_family = AF_INET6, 945 }; 946 947 static struct sctp_pf sctp_pf_inet6_specific = { 948 .event_msgname = sctp_inet6_event_msgname, 949 .skb_msgname = sctp_inet6_skb_msgname, 950 .af_supported = sctp_inet6_af_supported, 951 .cmp_addr = sctp_inet6_cmp_addr, 952 .bind_verify = sctp_inet6_bind_verify, 953 .send_verify = sctp_inet6_send_verify, 954 .supported_addrs = sctp_inet6_supported_addrs, 955 .create_accept_sk = sctp_v6_create_accept_sk, 956 .addr_v4map = sctp_v6_addr_v4map, 957 .af = &sctp_ipv6_specific, 958 }; 959 960 /* Initialize IPv6 support and register with inet6 stack. */ 961 int sctp_v6_init(void) 962 { 963 int rc = proto_register(&sctpv6_prot, 1); 964 965 if (rc) 966 goto out; 967 /* Register inet6 protocol. */ 968 rc = -EAGAIN; 969 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 970 goto out_unregister_sctp_proto; 971 972 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 973 inet6_register_protosw(&sctpv6_seqpacket_protosw); 974 inet6_register_protosw(&sctpv6_stream_protosw); 975 976 /* Register the SCTP specific PF_INET6 functions. */ 977 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6); 978 979 /* Register the SCTP specific AF_INET6 functions. */ 980 sctp_register_af(&sctp_ipv6_specific); 981 982 /* Register notifier for inet6 address additions/deletions. */ 983 register_inet6addr_notifier(&sctp_inet6addr_notifier); 984 rc = 0; 985 out: 986 return rc; 987 out_unregister_sctp_proto: 988 proto_unregister(&sctpv6_prot); 989 goto out; 990 } 991 992 /* IPv6 specific exit support. */ 993 void sctp_v6_exit(void) 994 { 995 list_del(&sctp_ipv6_specific.list); 996 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 997 inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 998 inet6_unregister_protosw(&sctpv6_stream_protosw); 999 unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 1000 proto_unregister(&sctpv6_prot); 1001 } 1002