1 /* SCTP kernel 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 implementation 8 * 9 * SCTP over IPv6. 10 * 11 * This SCTP 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 * This SCTP 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 * The sctp_local_addr_list needs to be protocted by a spin lock since 82 * multiple notifiers (say IPv4 and IPv6) may be running at the same 83 * time and thus corrupt the list. 84 * The reader side is protected with RCU. 85 */ 86 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, 87 void *ptr) 88 { 89 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; 90 struct sctp_sockaddr_entry *addr = NULL; 91 struct sctp_sockaddr_entry *temp; 92 int found = 0; 93 94 switch (ev) { 95 case NETDEV_UP: 96 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 97 if (addr) { 98 addr->a.v6.sin6_family = AF_INET6; 99 addr->a.v6.sin6_port = 0; 100 ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifa->addr); 101 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; 102 addr->valid = 1; 103 spin_lock_bh(&sctp_local_addr_lock); 104 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 105 spin_unlock_bh(&sctp_local_addr_lock); 106 } 107 break; 108 case NETDEV_DOWN: 109 spin_lock_bh(&sctp_local_addr_lock); 110 list_for_each_entry_safe(addr, temp, 111 &sctp_local_addr_list, list) { 112 if (addr->a.sa.sa_family == AF_INET6 && 113 ipv6_addr_equal(&addr->a.v6.sin6_addr, 114 &ifa->addr)) { 115 found = 1; 116 addr->valid = 0; 117 list_del_rcu(&addr->list); 118 break; 119 } 120 } 121 spin_unlock_bh(&sctp_local_addr_lock); 122 if (found) 123 call_rcu(&addr->rcu, sctp_local_addr_free); 124 break; 125 } 126 127 return NOTIFY_DONE; 128 } 129 130 static struct notifier_block sctp_inet6addr_notifier = { 131 .notifier_call = sctp_inet6addr_event, 132 }; 133 134 /* ICMP error handler. */ 135 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 136 u8 type, u8 code, int offset, __be32 info) 137 { 138 struct inet6_dev *idev; 139 struct sock *sk; 140 struct sctp_association *asoc; 141 struct sctp_transport *transport; 142 struct ipv6_pinfo *np; 143 sk_buff_data_t saveip, savesctp; 144 int err; 145 146 idev = in6_dev_get(skb->dev); 147 148 /* Fix up skb to look at the embedded net header. */ 149 saveip = skb->network_header; 150 savesctp = skb->transport_header; 151 skb_reset_network_header(skb); 152 skb_set_transport_header(skb, offset); 153 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport); 154 /* Put back, the original pointers. */ 155 skb->network_header = saveip; 156 skb->transport_header = savesctp; 157 if (!sk) { 158 ICMP6_INC_STATS_BH(dev_net(skb->dev), idev, ICMP6_MIB_INERRORS); 159 goto out; 160 } 161 162 /* Warning: The sock lock is held. Remember to call 163 * sctp_err_finish! 164 */ 165 166 switch (type) { 167 case ICMPV6_PKT_TOOBIG: 168 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); 169 goto out_unlock; 170 case ICMPV6_PARAMPROB: 171 if (ICMPV6_UNK_NEXTHDR == code) { 172 sctp_icmp_proto_unreachable(sk, asoc, transport); 173 goto out_unlock; 174 } 175 break; 176 default: 177 break; 178 } 179 180 np = inet6_sk(sk); 181 icmpv6_err_convert(type, code, &err); 182 if (!sock_owned_by_user(sk) && np->recverr) { 183 sk->sk_err = err; 184 sk->sk_error_report(sk); 185 } else { /* Only an error on timeout */ 186 sk->sk_err_soft = err; 187 } 188 189 out_unlock: 190 sctp_err_finish(sk, asoc); 191 out: 192 if (likely(idev != NULL)) 193 in6_dev_put(idev); 194 } 195 196 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */ 197 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport) 198 { 199 struct sock *sk = skb->sk; 200 struct ipv6_pinfo *np = inet6_sk(sk); 201 struct flowi fl; 202 203 memset(&fl, 0, sizeof(fl)); 204 205 fl.proto = sk->sk_protocol; 206 207 /* Fill in the dest address from the route entry passed with the skb 208 * and the source address from the transport. 209 */ 210 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr); 211 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr); 212 213 fl.fl6_flowlabel = np->flow_label; 214 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); 215 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL) 216 fl.oif = transport->saddr.v6.sin6_scope_id; 217 else 218 fl.oif = sk->sk_bound_dev_if; 219 220 if (np->opt && np->opt->srcrt) { 221 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 222 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 223 } 224 225 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", 226 __func__, skb, skb->len, 227 &fl.fl6_src, &fl.fl6_dst); 228 229 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 230 231 if (!(transport->param_flags & SPP_PMTUD_ENABLE)) 232 skb->local_df = 1; 233 234 return ip6_xmit(sk, skb, &fl, np->opt, 0); 235 } 236 237 /* Returns the dst cache entry for the given source and destination ip 238 * addresses. 239 */ 240 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, 241 union sctp_addr *daddr, 242 union sctp_addr *saddr) 243 { 244 struct dst_entry *dst; 245 struct flowi fl; 246 247 memset(&fl, 0, sizeof(fl)); 248 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); 249 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 250 fl.oif = daddr->v6.sin6_scope_id; 251 252 253 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl.fl6_dst); 254 255 if (saddr) { 256 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); 257 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl.fl6_src); 258 } 259 260 dst = ip6_route_output(&init_net, NULL, &fl); 261 if (!dst->error) { 262 struct rt6_info *rt; 263 rt = (struct rt6_info *)dst; 264 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n", 265 &rt->rt6i_dst.addr, &rt->rt6i_src.addr); 266 return dst; 267 } 268 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 269 dst_release(dst); 270 return NULL; 271 } 272 273 /* Returns the number of consecutive initial bits that match in the 2 ipv6 274 * addresses. 275 */ 276 static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 277 union sctp_addr *s2) 278 { 279 struct in6_addr *a1 = &s1->v6.sin6_addr; 280 struct in6_addr *a2 = &s2->v6.sin6_addr; 281 int i, j; 282 283 for (i = 0; i < 4 ; i++) { 284 __be32 a1xora2; 285 286 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; 287 288 if ((j = fls(ntohl(a1xora2)))) 289 return (i * 32 + 32 - j); 290 } 291 292 return (i*32); 293 } 294 295 /* Fills in the source address(saddr) based on the destination address(daddr) 296 * and asoc's bind address list. 297 */ 298 static void sctp_v6_get_saddr(struct sctp_sock *sk, 299 struct sctp_association *asoc, 300 struct dst_entry *dst, 301 union sctp_addr *daddr, 302 union sctp_addr *saddr) 303 { 304 struct sctp_bind_addr *bp; 305 struct sctp_sockaddr_entry *laddr; 306 sctp_scope_t scope; 307 union sctp_addr *baddr = NULL; 308 __u8 matchlen = 0; 309 __u8 bmatchlen; 310 311 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p daddr:%pI6 ", 312 __func__, asoc, dst, &daddr->v6.sin6_addr); 313 314 if (!asoc) { 315 ipv6_dev_get_saddr(sock_net(sctp_opt2sk(sk)), 316 dst ? ip6_dst_idev(dst)->dev : NULL, 317 &daddr->v6.sin6_addr, 318 inet6_sk(&sk->inet.sk)->srcprefs, 319 &saddr->v6.sin6_addr); 320 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: %pI6\n", 321 &saddr->v6.sin6_addr); 322 return; 323 } 324 325 scope = sctp_scope(daddr); 326 327 bp = &asoc->base.bind_addr; 328 329 /* Go through the bind address list and find the best source address 330 * that matches the scope of the destination address. 331 */ 332 rcu_read_lock(); 333 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 334 if (!laddr->valid) 335 continue; 336 if ((laddr->state == SCTP_ADDR_SRC) && 337 (laddr->a.sa.sa_family == AF_INET6) && 338 (scope <= sctp_scope(&laddr->a))) { 339 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 340 if (!baddr || (matchlen < bmatchlen)) { 341 baddr = &laddr->a; 342 matchlen = bmatchlen; 343 } 344 } 345 } 346 347 if (baddr) { 348 memcpy(saddr, baddr, sizeof(union sctp_addr)); 349 SCTP_DEBUG_PRINTK("saddr: %pI6\n", &saddr->v6.sin6_addr); 350 } else { 351 printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 352 "address for the dest:%pI6\n", 353 __func__, asoc, &daddr->v6.sin6_addr); 354 } 355 356 rcu_read_unlock(); 357 } 358 359 /* Make a copy of all potential local addresses. */ 360 static void sctp_v6_copy_addrlist(struct list_head *addrlist, 361 struct net_device *dev) 362 { 363 struct inet6_dev *in6_dev; 364 struct inet6_ifaddr *ifp; 365 struct sctp_sockaddr_entry *addr; 366 367 rcu_read_lock(); 368 if ((in6_dev = __in6_dev_get(dev)) == NULL) { 369 rcu_read_unlock(); 370 return; 371 } 372 373 read_lock_bh(&in6_dev->lock); 374 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { 375 /* Add the address to the local list. */ 376 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 377 if (addr) { 378 addr->a.v6.sin6_family = AF_INET6; 379 addr->a.v6.sin6_port = 0; 380 addr->a.v6.sin6_addr = ifp->addr; 381 addr->a.v6.sin6_scope_id = dev->ifindex; 382 addr->valid = 1; 383 INIT_LIST_HEAD(&addr->list); 384 INIT_RCU_HEAD(&addr->rcu); 385 list_add_tail(&addr->list, addrlist); 386 } 387 } 388 389 read_unlock_bh(&in6_dev->lock); 390 rcu_read_unlock(); 391 } 392 393 /* Initialize a sockaddr_storage from in incoming skb. */ 394 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 395 int is_saddr) 396 { 397 void *from; 398 __be16 *port; 399 struct sctphdr *sh; 400 401 port = &addr->v6.sin6_port; 402 addr->v6.sin6_family = AF_INET6; 403 addr->v6.sin6_flowinfo = 0; /* FIXME */ 404 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 405 406 sh = sctp_hdr(skb); 407 if (is_saddr) { 408 *port = sh->source; 409 from = &ipv6_hdr(skb)->saddr; 410 } else { 411 *port = sh->dest; 412 from = &ipv6_hdr(skb)->daddr; 413 } 414 ipv6_addr_copy(&addr->v6.sin6_addr, from); 415 } 416 417 /* Initialize an sctp_addr from a socket. */ 418 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 419 { 420 addr->v6.sin6_family = AF_INET6; 421 addr->v6.sin6_port = 0; 422 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 423 } 424 425 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 426 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 427 { 428 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 429 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 430 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 431 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 432 inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 433 addr->v4.sin_addr.s_addr; 434 } else { 435 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 436 } 437 } 438 439 /* Initialize sk->sk_daddr from sctp_addr. */ 440 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 441 { 442 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 443 inet6_sk(sk)->daddr.s6_addr32[0] = 0; 444 inet6_sk(sk)->daddr.s6_addr32[1] = 0; 445 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 446 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 447 } else { 448 inet6_sk(sk)->daddr = addr->v6.sin6_addr; 449 } 450 } 451 452 /* Initialize a sctp_addr from an address parameter. */ 453 static void sctp_v6_from_addr_param(union sctp_addr *addr, 454 union sctp_addr_param *param, 455 __be16 port, int iif) 456 { 457 addr->v6.sin6_family = AF_INET6; 458 addr->v6.sin6_port = port; 459 addr->v6.sin6_flowinfo = 0; /* BUG */ 460 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 461 addr->v6.sin6_scope_id = iif; 462 } 463 464 /* Initialize an address parameter from a sctp_addr and return the length 465 * of the address parameter. 466 */ 467 static int sctp_v6_to_addr_param(const union sctp_addr *addr, 468 union sctp_addr_param *param) 469 { 470 int length = sizeof(sctp_ipv6addr_param_t); 471 472 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 473 param->v6.param_hdr.length = htons(length); 474 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 475 476 return length; 477 } 478 479 /* Initialize a sctp_addr from a dst_entry. */ 480 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 481 __be16 port) 482 { 483 struct rt6_info *rt = (struct rt6_info *)dst; 484 addr->sa.sa_family = AF_INET6; 485 addr->v6.sin6_port = port; 486 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 487 } 488 489 /* Compare addresses exactly. 490 * v4-mapped-v6 is also in consideration. 491 */ 492 static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 493 const union sctp_addr *addr2) 494 { 495 if (addr1->sa.sa_family != addr2->sa.sa_family) { 496 if (addr1->sa.sa_family == AF_INET && 497 addr2->sa.sa_family == AF_INET6 && 498 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) { 499 if (addr2->v6.sin6_port == addr1->v4.sin_port && 500 addr2->v6.sin6_addr.s6_addr32[3] == 501 addr1->v4.sin_addr.s_addr) 502 return 1; 503 } 504 if (addr2->sa.sa_family == AF_INET && 505 addr1->sa.sa_family == AF_INET6 && 506 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) { 507 if (addr1->v6.sin6_port == addr2->v4.sin_port && 508 addr1->v6.sin6_addr.s6_addr32[3] == 509 addr2->v4.sin_addr.s_addr) 510 return 1; 511 } 512 return 0; 513 } 514 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 515 return 0; 516 /* If this is a linklocal address, compare the scope_id. */ 517 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 518 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 519 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 520 return 0; 521 } 522 } 523 524 return 1; 525 } 526 527 /* Initialize addr struct to INADDR_ANY. */ 528 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) 529 { 530 memset(addr, 0x00, sizeof(union sctp_addr)); 531 addr->v6.sin6_family = AF_INET6; 532 addr->v6.sin6_port = port; 533 } 534 535 /* Is this a wildcard address? */ 536 static int sctp_v6_is_any(const union sctp_addr *addr) 537 { 538 return ipv6_addr_any(&addr->v6.sin6_addr); 539 } 540 541 /* Should this be available for binding? */ 542 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 543 { 544 int type; 545 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 546 547 type = ipv6_addr_type(in6); 548 if (IPV6_ADDR_ANY == type) 549 return 1; 550 if (type == IPV6_ADDR_MAPPED) { 551 if (sp && !sp->v4mapped) 552 return 0; 553 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 554 return 0; 555 sctp_v6_map_v4(addr); 556 return sctp_get_af_specific(AF_INET)->available(addr, sp); 557 } 558 if (!(type & IPV6_ADDR_UNICAST)) 559 return 0; 560 561 return ipv6_chk_addr(&init_net, in6, NULL, 0); 562 } 563 564 /* This function checks if the address is a valid address to be used for 565 * SCTP. 566 * 567 * Output: 568 * Return 0 - If the address is a non-unicast or an illegal address. 569 * Return 1 - If the address is a unicast. 570 */ 571 static int sctp_v6_addr_valid(union sctp_addr *addr, 572 struct sctp_sock *sp, 573 const struct sk_buff *skb) 574 { 575 int ret = ipv6_addr_type(&addr->v6.sin6_addr); 576 577 /* Support v4-mapped-v6 address. */ 578 if (ret == IPV6_ADDR_MAPPED) { 579 /* Note: This routine is used in input, so v4-mapped-v6 580 * are disallowed here when there is no sctp_sock. 581 */ 582 if (!sp || !sp->v4mapped) 583 return 0; 584 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 585 return 0; 586 sctp_v6_map_v4(addr); 587 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 588 } 589 590 /* Is this a non-unicast address */ 591 if (!(ret & IPV6_ADDR_UNICAST)) 592 return 0; 593 594 return 1; 595 } 596 597 /* What is the scope of 'addr'? */ 598 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 599 { 600 int v6scope; 601 sctp_scope_t retval; 602 603 /* The IPv6 scope is really a set of bit fields. 604 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 605 */ 606 607 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 608 switch (v6scope) { 609 case IFA_HOST: 610 retval = SCTP_SCOPE_LOOPBACK; 611 break; 612 case IFA_LINK: 613 retval = SCTP_SCOPE_LINK; 614 break; 615 case IFA_SITE: 616 retval = SCTP_SCOPE_PRIVATE; 617 break; 618 default: 619 retval = SCTP_SCOPE_GLOBAL; 620 break; 621 } 622 623 return retval; 624 } 625 626 /* Create and initialize a new sk for the socket to be returned by accept(). */ 627 static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 628 struct sctp_association *asoc) 629 { 630 struct sock *newsk; 631 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 632 struct sctp6_sock *newsctp6sk; 633 634 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot); 635 if (!newsk) 636 goto out; 637 638 sock_init_data(NULL, newsk); 639 640 sctp_copy_sock(newsk, sk, asoc); 641 sock_reset_flag(sk, SOCK_ZAPPED); 642 643 newsctp6sk = (struct sctp6_sock *)newsk; 644 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 645 646 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped; 647 648 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 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 656 657 sk_refcnt_debug_inc(newsk); 658 659 if (newsk->sk_prot->init(newsk)) { 660 sk_common_release(newsk); 661 newsk = NULL; 662 } 663 664 out: 665 return newsk; 666 } 667 668 /* Map v4 address to mapped v6 address */ 669 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 670 { 671 if (sp->v4mapped && AF_INET == addr->sa.sa_family) 672 sctp_v4_map_v6(addr); 673 } 674 675 /* Where did this skb come from? */ 676 static int sctp_v6_skb_iif(const struct sk_buff *skb) 677 { 678 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 679 return opt->iif; 680 } 681 682 /* Was this packet marked by Explicit Congestion Notification? */ 683 static int sctp_v6_is_ce(const struct sk_buff *skb) 684 { 685 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20); 686 } 687 688 /* Dump the v6 addr to the seq file. */ 689 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 690 { 691 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr); 692 } 693 694 static void sctp_v6_ecn_capable(struct sock *sk) 695 { 696 inet6_sk(sk)->tclass |= INET_ECN_ECT_0; 697 } 698 699 /* Initialize a PF_INET6 socket msg_name. */ 700 static void sctp_inet6_msgname(char *msgname, int *addr_len) 701 { 702 struct sockaddr_in6 *sin6; 703 704 sin6 = (struct sockaddr_in6 *)msgname; 705 sin6->sin6_family = AF_INET6; 706 sin6->sin6_flowinfo = 0; 707 sin6->sin6_scope_id = 0; /*FIXME */ 708 *addr_len = sizeof(struct sockaddr_in6); 709 } 710 711 /* Initialize a PF_INET msgname from a ulpevent. */ 712 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 713 char *msgname, int *addrlen) 714 { 715 struct sockaddr_in6 *sin6, *sin6from; 716 717 if (msgname) { 718 union sctp_addr *addr; 719 struct sctp_association *asoc; 720 721 asoc = event->asoc; 722 sctp_inet6_msgname(msgname, addrlen); 723 sin6 = (struct sockaddr_in6 *)msgname; 724 sin6->sin6_port = htons(asoc->peer.port); 725 addr = &asoc->peer.primary_addr; 726 727 /* Note: If we go to a common v6 format, this code 728 * will change. 729 */ 730 731 /* Map ipv4 address into v4-mapped-on-v6 address. */ 732 if (sctp_sk(asoc->base.sk)->v4mapped && 733 AF_INET == addr->sa.sa_family) { 734 sctp_v4_map_v6((union sctp_addr *)sin6); 735 sin6->sin6_addr.s6_addr32[3] = 736 addr->v4.sin_addr.s_addr; 737 return; 738 } 739 740 sin6from = &asoc->peer.primary_addr.v6; 741 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 742 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 743 sin6->sin6_scope_id = sin6from->sin6_scope_id; 744 } 745 } 746 747 /* Initialize a msg_name from an inbound skb. */ 748 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 749 int *addr_len) 750 { 751 struct sctphdr *sh; 752 struct sockaddr_in6 *sin6; 753 754 if (msgname) { 755 sctp_inet6_msgname(msgname, addr_len); 756 sin6 = (struct sockaddr_in6 *)msgname; 757 sh = sctp_hdr(skb); 758 sin6->sin6_port = sh->source; 759 760 /* Map ipv4 address into v4-mapped-on-v6 address. */ 761 if (sctp_sk(skb->sk)->v4mapped && 762 ip_hdr(skb)->version == 4) { 763 sctp_v4_map_v6((union sctp_addr *)sin6); 764 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr; 765 return; 766 } 767 768 /* Otherwise, just copy the v6 address. */ 769 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 770 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 771 struct sctp_ulpevent *ev = sctp_skb2event(skb); 772 sin6->sin6_scope_id = ev->iif; 773 } 774 } 775 } 776 777 /* Do we support this AF? */ 778 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 779 { 780 switch (family) { 781 case AF_INET6: 782 return 1; 783 /* v4-mapped-v6 addresses */ 784 case AF_INET: 785 if (!__ipv6_only_sock(sctp_opt2sk(sp))) 786 return 1; 787 default: 788 return 0; 789 } 790 } 791 792 /* Address matching with wildcards allowed. This extra level 793 * of indirection lets us choose whether a PF_INET6 should 794 * disallow any v4 addresses if we so choose. 795 */ 796 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 797 const union sctp_addr *addr2, 798 struct sctp_sock *opt) 799 { 800 struct sctp_af *af1, *af2; 801 struct sock *sk = sctp_opt2sk(opt); 802 803 af1 = sctp_get_af_specific(addr1->sa.sa_family); 804 af2 = sctp_get_af_specific(addr2->sa.sa_family); 805 806 if (!af1 || !af2) 807 return 0; 808 809 /* If the socket is IPv6 only, v4 addrs will not match */ 810 if (__ipv6_only_sock(sk) && af1 != af2) 811 return 0; 812 813 /* Today, wildcard AF_INET/AF_INET6. */ 814 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2)) 815 return 1; 816 817 if (addr1->sa.sa_family != addr2->sa.sa_family) 818 return 0; 819 820 return af1->cmp_addr(addr1, addr2); 821 } 822 823 /* Verify that the provided sockaddr looks bindable. Common verification, 824 * has already been taken care of. 825 */ 826 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 827 { 828 struct sctp_af *af; 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(&init_net, addr->v6.sin6_scope_id); 841 if (!dev) 842 return 0; 843 if (!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr, 844 dev, 0)) { 845 dev_put(dev); 846 return 0; 847 } 848 dev_put(dev); 849 } else if (type == IPV6_ADDR_MAPPED) { 850 if (!opt->v4mapped) 851 return 0; 852 } 853 854 af = opt->pf->af; 855 } 856 return af->available(addr, opt); 857 } 858 859 /* Verify that the provided sockaddr looks sendable. Common verification, 860 * has already been taken care of. 861 */ 862 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 863 { 864 struct sctp_af *af = NULL; 865 866 /* ASSERT: address family has already been verified. */ 867 if (addr->sa.sa_family != AF_INET6) 868 af = sctp_get_af_specific(addr->sa.sa_family); 869 else { 870 int type = ipv6_addr_type(&addr->v6.sin6_addr); 871 struct net_device *dev; 872 873 if (type & IPV6_ADDR_LINKLOCAL) { 874 if (!addr->v6.sin6_scope_id) 875 return 0; 876 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id); 877 if (!dev) 878 return 0; 879 dev_put(dev); 880 } 881 af = opt->pf->af; 882 } 883 884 return af != NULL; 885 } 886 887 /* Fill in Supported Address Type information for INIT and INIT-ACK 888 * chunks. Note: In the future, we may want to look at sock options 889 * to determine whether a PF_INET6 socket really wants to have IPV4 890 * addresses. 891 * Returns number of addresses supported. 892 */ 893 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 894 __be16 *types) 895 { 896 types[0] = SCTP_PARAM_IPV6_ADDRESS; 897 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) { 898 types[1] = SCTP_PARAM_IPV4_ADDRESS; 899 return 2; 900 } 901 return 1; 902 } 903 904 static const struct proto_ops inet6_seqpacket_ops = { 905 .family = PF_INET6, 906 .owner = THIS_MODULE, 907 .release = inet6_release, 908 .bind = inet6_bind, 909 .connect = inet_dgram_connect, 910 .socketpair = sock_no_socketpair, 911 .accept = inet_accept, 912 .getname = inet6_getname, 913 .poll = sctp_poll, 914 .ioctl = inet6_ioctl, 915 .listen = sctp_inet_listen, 916 .shutdown = inet_shutdown, 917 .setsockopt = sock_common_setsockopt, 918 .getsockopt = sock_common_getsockopt, 919 .sendmsg = inet_sendmsg, 920 .recvmsg = sock_common_recvmsg, 921 .mmap = sock_no_mmap, 922 #ifdef CONFIG_COMPAT 923 .compat_setsockopt = compat_sock_common_setsockopt, 924 .compat_getsockopt = compat_sock_common_getsockopt, 925 #endif 926 }; 927 928 static struct inet_protosw sctpv6_seqpacket_protosw = { 929 .type = SOCK_SEQPACKET, 930 .protocol = IPPROTO_SCTP, 931 .prot = &sctpv6_prot, 932 .ops = &inet6_seqpacket_ops, 933 .capability = -1, 934 .no_check = 0, 935 .flags = SCTP_PROTOSW_FLAG 936 }; 937 static struct inet_protosw sctpv6_stream_protosw = { 938 .type = SOCK_STREAM, 939 .protocol = IPPROTO_SCTP, 940 .prot = &sctpv6_prot, 941 .ops = &inet6_seqpacket_ops, 942 .capability = -1, 943 .no_check = 0, 944 .flags = SCTP_PROTOSW_FLAG, 945 }; 946 947 static int sctp6_rcv(struct sk_buff *skb) 948 { 949 return sctp_rcv(skb) ? -1 : 0; 950 } 951 952 static const struct inet6_protocol sctpv6_protocol = { 953 .handler = sctp6_rcv, 954 .err_handler = sctp_v6_err, 955 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 956 }; 957 958 static struct sctp_af sctp_af_inet6 = { 959 .sa_family = AF_INET6, 960 .sctp_xmit = sctp_v6_xmit, 961 .setsockopt = ipv6_setsockopt, 962 .getsockopt = ipv6_getsockopt, 963 .get_dst = sctp_v6_get_dst, 964 .get_saddr = sctp_v6_get_saddr, 965 .copy_addrlist = sctp_v6_copy_addrlist, 966 .from_skb = sctp_v6_from_skb, 967 .from_sk = sctp_v6_from_sk, 968 .to_sk_saddr = sctp_v6_to_sk_saddr, 969 .to_sk_daddr = sctp_v6_to_sk_daddr, 970 .from_addr_param = sctp_v6_from_addr_param, 971 .to_addr_param = sctp_v6_to_addr_param, 972 .dst_saddr = sctp_v6_dst_saddr, 973 .cmp_addr = sctp_v6_cmp_addr, 974 .scope = sctp_v6_scope, 975 .addr_valid = sctp_v6_addr_valid, 976 .inaddr_any = sctp_v6_inaddr_any, 977 .is_any = sctp_v6_is_any, 978 .available = sctp_v6_available, 979 .skb_iif = sctp_v6_skb_iif, 980 .is_ce = sctp_v6_is_ce, 981 .seq_dump_addr = sctp_v6_seq_dump_addr, 982 .ecn_capable = sctp_v6_ecn_capable, 983 .net_header_len = sizeof(struct ipv6hdr), 984 .sockaddr_len = sizeof(struct sockaddr_in6), 985 #ifdef CONFIG_COMPAT 986 .compat_setsockopt = compat_ipv6_setsockopt, 987 .compat_getsockopt = compat_ipv6_getsockopt, 988 #endif 989 }; 990 991 static struct sctp_pf sctp_pf_inet6 = { 992 .event_msgname = sctp_inet6_event_msgname, 993 .skb_msgname = sctp_inet6_skb_msgname, 994 .af_supported = sctp_inet6_af_supported, 995 .cmp_addr = sctp_inet6_cmp_addr, 996 .bind_verify = sctp_inet6_bind_verify, 997 .send_verify = sctp_inet6_send_verify, 998 .supported_addrs = sctp_inet6_supported_addrs, 999 .create_accept_sk = sctp_v6_create_accept_sk, 1000 .addr_v4map = sctp_v6_addr_v4map, 1001 .af = &sctp_af_inet6, 1002 }; 1003 1004 /* Initialize IPv6 support and register with socket layer. */ 1005 void sctp_v6_pf_init(void) 1006 { 1007 /* Register the SCTP specific PF_INET6 functions. */ 1008 sctp_register_pf(&sctp_pf_inet6, PF_INET6); 1009 1010 /* Register the SCTP specific AF_INET6 functions. */ 1011 sctp_register_af(&sctp_af_inet6); 1012 } 1013 1014 void sctp_v6_pf_exit(void) 1015 { 1016 list_del(&sctp_af_inet6.list); 1017 } 1018 1019 /* Initialize IPv6 support and register with socket layer. */ 1020 int sctp_v6_protosw_init(void) 1021 { 1022 int rc; 1023 1024 rc = proto_register(&sctpv6_prot, 1); 1025 if (rc) 1026 return rc; 1027 1028 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 1029 inet6_register_protosw(&sctpv6_seqpacket_protosw); 1030 inet6_register_protosw(&sctpv6_stream_protosw); 1031 1032 return 0; 1033 } 1034 1035 void sctp_v6_protosw_exit(void) 1036 { 1037 inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1038 inet6_unregister_protosw(&sctpv6_stream_protosw); 1039 proto_unregister(&sctpv6_prot); 1040 } 1041 1042 1043 /* Register with inet6 layer. */ 1044 int sctp_v6_add_protocol(void) 1045 { 1046 /* Register notifier for inet6 address additions/deletions. */ 1047 register_inet6addr_notifier(&sctp_inet6addr_notifier); 1048 1049 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 1050 return -EAGAIN; 1051 1052 return 0; 1053 } 1054 1055 /* Unregister with inet6 layer. */ 1056 void sctp_v6_del_protocol(void) 1057 { 1058 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1059 unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 1060 } 1061