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 memcpy(&addr->a.v6.sin6_addr, &ifa->addr, 101 sizeof(struct in6_addr)); 102 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; 103 addr->valid = 1; 104 spin_lock_bh(&sctp_local_addr_lock); 105 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 106 spin_unlock_bh(&sctp_local_addr_lock); 107 } 108 break; 109 case NETDEV_DOWN: 110 spin_lock_bh(&sctp_local_addr_lock); 111 list_for_each_entry_safe(addr, temp, 112 &sctp_local_addr_list, list) { 113 if (addr->a.sa.sa_family == AF_INET6 && 114 ipv6_addr_equal(&addr->a.v6.sin6_addr, 115 &ifa->addr)) { 116 found = 1; 117 addr->valid = 0; 118 list_del_rcu(&addr->list); 119 break; 120 } 121 } 122 spin_unlock_bh(&sctp_local_addr_lock); 123 if (found) 124 call_rcu(&addr->rcu, sctp_local_addr_free); 125 break; 126 } 127 128 return NOTIFY_DONE; 129 } 130 131 static struct notifier_block sctp_inet6addr_notifier = { 132 .notifier_call = sctp_inet6addr_event, 133 }; 134 135 /* ICMP error handler. */ 136 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 137 int type, int code, int offset, __be32 info) 138 { 139 struct inet6_dev *idev; 140 struct sock *sk; 141 struct sctp_association *asoc; 142 struct sctp_transport *transport; 143 struct ipv6_pinfo *np; 144 sk_buff_data_t saveip, savesctp; 145 int err; 146 147 idev = in6_dev_get(skb->dev); 148 149 /* Fix up skb to look at the embedded net header. */ 150 saveip = skb->network_header; 151 savesctp = skb->transport_header; 152 skb_reset_network_header(skb); 153 skb_set_transport_header(skb, offset); 154 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport); 155 /* Put back, the original pointers. */ 156 skb->network_header = saveip; 157 skb->transport_header = savesctp; 158 if (!sk) { 159 ICMP6_INC_STATS_BH(dev_net(skb->dev), idev, ICMP6_MIB_INERRORS); 160 goto out; 161 } 162 163 /* Warning: The sock lock is held. Remember to call 164 * sctp_err_finish! 165 */ 166 167 switch (type) { 168 case ICMPV6_PKT_TOOBIG: 169 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); 170 goto out_unlock; 171 case ICMPV6_PARAMPROB: 172 if (ICMPV6_UNK_NEXTHDR == code) { 173 sctp_icmp_proto_unreachable(sk, asoc, transport); 174 goto out_unlock; 175 } 176 break; 177 default: 178 break; 179 } 180 181 np = inet6_sk(sk); 182 icmpv6_err_convert(type, code, &err); 183 if (!sock_owned_by_user(sk) && np->recverr) { 184 sk->sk_err = err; 185 sk->sk_error_report(sk); 186 } else { /* Only an error on timeout */ 187 sk->sk_err_soft = err; 188 } 189 190 out_unlock: 191 sctp_err_finish(sk, asoc); 192 out: 193 if (likely(idev != NULL)) 194 in6_dev_put(idev); 195 } 196 197 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */ 198 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport) 199 { 200 struct sock *sk = skb->sk; 201 struct ipv6_pinfo *np = inet6_sk(sk); 202 struct flowi fl; 203 204 memset(&fl, 0, sizeof(fl)); 205 206 fl.proto = sk->sk_protocol; 207 208 /* Fill in the dest address from the route entry passed with the skb 209 * and the source address from the transport. 210 */ 211 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr); 212 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr); 213 214 fl.fl6_flowlabel = np->flow_label; 215 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); 216 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL) 217 fl.oif = transport->saddr.v6.sin6_scope_id; 218 else 219 fl.oif = sk->sk_bound_dev_if; 220 221 if (np->opt && np->opt->srcrt) { 222 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 223 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 224 } 225 226 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", 227 __func__, skb, skb->len, 228 &fl.fl6_src, &fl.fl6_dst); 229 230 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 231 232 if (!(transport->param_flags & SPP_PMTUD_ENABLE)) 233 skb->local_df = 1; 234 235 return ip6_xmit(sk, skb, &fl, np->opt, 0); 236 } 237 238 /* Returns the dst cache entry for the given source and destination ip 239 * addresses. 240 */ 241 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, 242 union sctp_addr *daddr, 243 union sctp_addr *saddr) 244 { 245 struct dst_entry *dst; 246 struct flowi fl; 247 248 memset(&fl, 0, sizeof(fl)); 249 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); 250 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 251 fl.oif = daddr->v6.sin6_scope_id; 252 253 254 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl.fl6_dst); 255 256 if (saddr) { 257 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); 258 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl.fl6_src); 259 } 260 261 dst = ip6_route_output(&init_net, NULL, &fl); 262 if (!dst->error) { 263 struct rt6_info *rt; 264 rt = (struct rt6_info *)dst; 265 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n", 266 &rt->rt6i_dst.addr, &rt->rt6i_src.addr); 267 return dst; 268 } 269 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 270 dst_release(dst); 271 return NULL; 272 } 273 274 /* Returns the number of consecutive initial bits that match in the 2 ipv6 275 * addresses. 276 */ 277 static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 278 union sctp_addr *s2) 279 { 280 struct in6_addr *a1 = &s1->v6.sin6_addr; 281 struct in6_addr *a2 = &s2->v6.sin6_addr; 282 int i, j; 283 284 for (i = 0; i < 4 ; i++) { 285 __be32 a1xora2; 286 287 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; 288 289 if ((j = fls(ntohl(a1xora2)))) 290 return (i * 32 + 32 - j); 291 } 292 293 return (i*32); 294 } 295 296 /* Fills in the source address(saddr) based on the destination address(daddr) 297 * and asoc's bind address list. 298 */ 299 static void sctp_v6_get_saddr(struct sctp_sock *sk, 300 struct sctp_association *asoc, 301 struct dst_entry *dst, 302 union sctp_addr *daddr, 303 union sctp_addr *saddr) 304 { 305 struct sctp_bind_addr *bp; 306 struct sctp_sockaddr_entry *laddr; 307 sctp_scope_t scope; 308 union sctp_addr *baddr = NULL; 309 __u8 matchlen = 0; 310 __u8 bmatchlen; 311 312 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p daddr:%pI6 ", 313 __func__, asoc, dst, &daddr->v6.sin6_addr); 314 315 if (!asoc) { 316 ipv6_dev_get_saddr(sock_net(sctp_opt2sk(sk)), 317 dst ? ip6_dst_idev(dst)->dev : NULL, 318 &daddr->v6.sin6_addr, 319 inet6_sk(&sk->inet.sk)->srcprefs, 320 &saddr->v6.sin6_addr); 321 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: %pI6\n", 322 &saddr->v6.sin6_addr); 323 return; 324 } 325 326 scope = sctp_scope(daddr); 327 328 bp = &asoc->base.bind_addr; 329 330 /* Go through the bind address list and find the best source address 331 * that matches the scope of the destination address. 332 */ 333 rcu_read_lock(); 334 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 335 if (!laddr->valid) 336 continue; 337 if ((laddr->state == SCTP_ADDR_SRC) && 338 (laddr->a.sa.sa_family == AF_INET6) && 339 (scope <= sctp_scope(&laddr->a))) { 340 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 341 if (!baddr || (matchlen < bmatchlen)) { 342 baddr = &laddr->a; 343 matchlen = bmatchlen; 344 } 345 } 346 } 347 348 if (baddr) { 349 memcpy(saddr, baddr, sizeof(union sctp_addr)); 350 SCTP_DEBUG_PRINTK("saddr: %pI6\n", &saddr->v6.sin6_addr); 351 } else { 352 printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 353 "address for the dest:%pI6\n", 354 __func__, asoc, &daddr->v6.sin6_addr); 355 } 356 357 rcu_read_unlock(); 358 } 359 360 /* Make a copy of all potential local addresses. */ 361 static void sctp_v6_copy_addrlist(struct list_head *addrlist, 362 struct net_device *dev) 363 { 364 struct inet6_dev *in6_dev; 365 struct inet6_ifaddr *ifp; 366 struct sctp_sockaddr_entry *addr; 367 368 rcu_read_lock(); 369 if ((in6_dev = __in6_dev_get(dev)) == NULL) { 370 rcu_read_unlock(); 371 return; 372 } 373 374 read_lock_bh(&in6_dev->lock); 375 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { 376 /* Add the address to the local list. */ 377 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 378 if (addr) { 379 addr->a.v6.sin6_family = AF_INET6; 380 addr->a.v6.sin6_port = 0; 381 addr->a.v6.sin6_addr = ifp->addr; 382 addr->a.v6.sin6_scope_id = dev->ifindex; 383 addr->valid = 1; 384 INIT_LIST_HEAD(&addr->list); 385 INIT_RCU_HEAD(&addr->rcu); 386 list_add_tail(&addr->list, addrlist); 387 } 388 } 389 390 read_unlock_bh(&in6_dev->lock); 391 rcu_read_unlock(); 392 } 393 394 /* Initialize a sockaddr_storage from in incoming skb. */ 395 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 396 int is_saddr) 397 { 398 void *from; 399 __be16 *port; 400 struct sctphdr *sh; 401 402 port = &addr->v6.sin6_port; 403 addr->v6.sin6_family = AF_INET6; 404 addr->v6.sin6_flowinfo = 0; /* FIXME */ 405 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 406 407 sh = sctp_hdr(skb); 408 if (is_saddr) { 409 *port = sh->source; 410 from = &ipv6_hdr(skb)->saddr; 411 } else { 412 *port = sh->dest; 413 from = &ipv6_hdr(skb)->daddr; 414 } 415 ipv6_addr_copy(&addr->v6.sin6_addr, from); 416 } 417 418 /* Initialize an sctp_addr from a socket. */ 419 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 420 { 421 addr->v6.sin6_family = AF_INET6; 422 addr->v6.sin6_port = 0; 423 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 424 } 425 426 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 427 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 428 { 429 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 430 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 431 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 432 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 433 inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 434 addr->v4.sin_addr.s_addr; 435 } else { 436 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 437 } 438 } 439 440 /* Initialize sk->sk_daddr from sctp_addr. */ 441 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 442 { 443 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 444 inet6_sk(sk)->daddr.s6_addr32[0] = 0; 445 inet6_sk(sk)->daddr.s6_addr32[1] = 0; 446 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 447 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 448 } else { 449 inet6_sk(sk)->daddr = addr->v6.sin6_addr; 450 } 451 } 452 453 /* Initialize a sctp_addr from an address parameter. */ 454 static void sctp_v6_from_addr_param(union sctp_addr *addr, 455 union sctp_addr_param *param, 456 __be16 port, int iif) 457 { 458 addr->v6.sin6_family = AF_INET6; 459 addr->v6.sin6_port = port; 460 addr->v6.sin6_flowinfo = 0; /* BUG */ 461 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 462 addr->v6.sin6_scope_id = iif; 463 } 464 465 /* Initialize an address parameter from a sctp_addr and return the length 466 * of the address parameter. 467 */ 468 static int sctp_v6_to_addr_param(const union sctp_addr *addr, 469 union sctp_addr_param *param) 470 { 471 int length = sizeof(sctp_ipv6addr_param_t); 472 473 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 474 param->v6.param_hdr.length = htons(length); 475 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 476 477 return length; 478 } 479 480 /* Initialize a sctp_addr from a dst_entry. */ 481 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 482 __be16 port) 483 { 484 struct rt6_info *rt = (struct rt6_info *)dst; 485 addr->sa.sa_family = AF_INET6; 486 addr->v6.sin6_port = port; 487 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 488 } 489 490 /* Compare addresses exactly. 491 * v4-mapped-v6 is also in consideration. 492 */ 493 static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 494 const union sctp_addr *addr2) 495 { 496 if (addr1->sa.sa_family != addr2->sa.sa_family) { 497 if (addr1->sa.sa_family == AF_INET && 498 addr2->sa.sa_family == AF_INET6 && 499 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) { 500 if (addr2->v6.sin6_port == addr1->v4.sin_port && 501 addr2->v6.sin6_addr.s6_addr32[3] == 502 addr1->v4.sin_addr.s_addr) 503 return 1; 504 } 505 if (addr2->sa.sa_family == AF_INET && 506 addr1->sa.sa_family == AF_INET6 && 507 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) { 508 if (addr1->v6.sin6_port == addr2->v4.sin_port && 509 addr1->v6.sin6_addr.s6_addr32[3] == 510 addr2->v4.sin_addr.s_addr) 511 return 1; 512 } 513 return 0; 514 } 515 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 516 return 0; 517 /* If this is a linklocal address, compare the scope_id. */ 518 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 519 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 520 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 521 return 0; 522 } 523 } 524 525 return 1; 526 } 527 528 /* Initialize addr struct to INADDR_ANY. */ 529 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) 530 { 531 memset(addr, 0x00, sizeof(union sctp_addr)); 532 addr->v6.sin6_family = AF_INET6; 533 addr->v6.sin6_port = port; 534 } 535 536 /* Is this a wildcard address? */ 537 static int sctp_v6_is_any(const union sctp_addr *addr) 538 { 539 return ipv6_addr_any(&addr->v6.sin6_addr); 540 } 541 542 /* Should this be available for binding? */ 543 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 544 { 545 int type; 546 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 547 548 type = ipv6_addr_type(in6); 549 if (IPV6_ADDR_ANY == type) 550 return 1; 551 if (type == IPV6_ADDR_MAPPED) { 552 if (sp && !sp->v4mapped) 553 return 0; 554 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 555 return 0; 556 sctp_v6_map_v4(addr); 557 return sctp_get_af_specific(AF_INET)->available(addr, sp); 558 } 559 if (!(type & IPV6_ADDR_UNICAST)) 560 return 0; 561 562 return ipv6_chk_addr(&init_net, in6, NULL, 0); 563 } 564 565 /* This function checks if the address is a valid address to be used for 566 * SCTP. 567 * 568 * Output: 569 * Return 0 - If the address is a non-unicast or an illegal address. 570 * Return 1 - If the address is a unicast. 571 */ 572 static int sctp_v6_addr_valid(union sctp_addr *addr, 573 struct sctp_sock *sp, 574 const struct sk_buff *skb) 575 { 576 int ret = ipv6_addr_type(&addr->v6.sin6_addr); 577 578 /* Support v4-mapped-v6 address. */ 579 if (ret == IPV6_ADDR_MAPPED) { 580 /* Note: This routine is used in input, so v4-mapped-v6 581 * are disallowed here when there is no sctp_sock. 582 */ 583 if (!sp || !sp->v4mapped) 584 return 0; 585 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 586 return 0; 587 sctp_v6_map_v4(addr); 588 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 589 } 590 591 /* Is this a non-unicast address */ 592 if (!(ret & IPV6_ADDR_UNICAST)) 593 return 0; 594 595 return 1; 596 } 597 598 /* What is the scope of 'addr'? */ 599 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 600 { 601 int v6scope; 602 sctp_scope_t retval; 603 604 /* The IPv6 scope is really a set of bit fields. 605 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 606 */ 607 608 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 609 switch (v6scope) { 610 case IFA_HOST: 611 retval = SCTP_SCOPE_LOOPBACK; 612 break; 613 case IFA_LINK: 614 retval = SCTP_SCOPE_LINK; 615 break; 616 case IFA_SITE: 617 retval = SCTP_SCOPE_PRIVATE; 618 break; 619 default: 620 retval = SCTP_SCOPE_GLOBAL; 621 break; 622 } 623 624 return retval; 625 } 626 627 /* Create and initialize a new sk for the socket to be returned by accept(). */ 628 static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 629 struct sctp_association *asoc) 630 { 631 struct inet_sock *inet = inet_sk(sk); 632 struct sock *newsk; 633 struct inet_sock *newinet; 634 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 635 struct sctp6_sock *newsctp6sk; 636 637 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot); 638 if (!newsk) 639 goto out; 640 641 sock_init_data(NULL, newsk); 642 643 newsk->sk_type = SOCK_STREAM; 644 645 newsk->sk_prot = sk->sk_prot; 646 newsk->sk_no_check = sk->sk_no_check; 647 newsk->sk_reuse = sk->sk_reuse; 648 649 newsk->sk_destruct = inet_sock_destruct; 650 newsk->sk_family = PF_INET6; 651 newsk->sk_protocol = IPPROTO_SCTP; 652 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 653 newsk->sk_shutdown = sk->sk_shutdown; 654 sock_reset_flag(sk, SOCK_ZAPPED); 655 656 newsctp6sk = (struct sctp6_sock *)newsk; 657 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 658 659 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped; 660 661 newinet = inet_sk(newsk); 662 newnp = inet6_sk(newsk); 663 664 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 665 666 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 667 * and getpeername(). 668 */ 669 newinet->sport = inet->sport; 670 newnp->saddr = np->saddr; 671 newnp->rcv_saddr = np->rcv_saddr; 672 newinet->dport = htons(asoc->peer.port); 673 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 674 675 /* Init the ipv4 part of the socket since we can have sockets 676 * using v6 API for ipv4. 677 */ 678 newinet->uc_ttl = -1; 679 newinet->mc_loop = 1; 680 newinet->mc_ttl = 1; 681 newinet->mc_index = 0; 682 newinet->mc_list = NULL; 683 684 if (ipv4_config.no_pmtu_disc) 685 newinet->pmtudisc = IP_PMTUDISC_DONT; 686 else 687 newinet->pmtudisc = IP_PMTUDISC_WANT; 688 689 sk_refcnt_debug_inc(newsk); 690 691 if (newsk->sk_prot->init(newsk)) { 692 sk_common_release(newsk); 693 newsk = NULL; 694 } 695 696 out: 697 return newsk; 698 } 699 700 /* Map v4 address to mapped v6 address */ 701 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 702 { 703 if (sp->v4mapped && AF_INET == addr->sa.sa_family) 704 sctp_v4_map_v6(addr); 705 } 706 707 /* Where did this skb come from? */ 708 static int sctp_v6_skb_iif(const struct sk_buff *skb) 709 { 710 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 711 return opt->iif; 712 } 713 714 /* Was this packet marked by Explicit Congestion Notification? */ 715 static int sctp_v6_is_ce(const struct sk_buff *skb) 716 { 717 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20); 718 } 719 720 /* Dump the v6 addr to the seq file. */ 721 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 722 { 723 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr); 724 } 725 726 static void sctp_v6_ecn_capable(struct sock *sk) 727 { 728 inet6_sk(sk)->tclass |= INET_ECN_ECT_0; 729 } 730 731 /* Initialize a PF_INET6 socket msg_name. */ 732 static void sctp_inet6_msgname(char *msgname, int *addr_len) 733 { 734 struct sockaddr_in6 *sin6; 735 736 sin6 = (struct sockaddr_in6 *)msgname; 737 sin6->sin6_family = AF_INET6; 738 sin6->sin6_flowinfo = 0; 739 sin6->sin6_scope_id = 0; /*FIXME */ 740 *addr_len = sizeof(struct sockaddr_in6); 741 } 742 743 /* Initialize a PF_INET msgname from a ulpevent. */ 744 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 745 char *msgname, int *addrlen) 746 { 747 struct sockaddr_in6 *sin6, *sin6from; 748 749 if (msgname) { 750 union sctp_addr *addr; 751 struct sctp_association *asoc; 752 753 asoc = event->asoc; 754 sctp_inet6_msgname(msgname, addrlen); 755 sin6 = (struct sockaddr_in6 *)msgname; 756 sin6->sin6_port = htons(asoc->peer.port); 757 addr = &asoc->peer.primary_addr; 758 759 /* Note: If we go to a common v6 format, this code 760 * will change. 761 */ 762 763 /* Map ipv4 address into v4-mapped-on-v6 address. */ 764 if (sctp_sk(asoc->base.sk)->v4mapped && 765 AF_INET == addr->sa.sa_family) { 766 sctp_v4_map_v6((union sctp_addr *)sin6); 767 sin6->sin6_addr.s6_addr32[3] = 768 addr->v4.sin_addr.s_addr; 769 return; 770 } 771 772 sin6from = &asoc->peer.primary_addr.v6; 773 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 774 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 775 sin6->sin6_scope_id = sin6from->sin6_scope_id; 776 } 777 } 778 779 /* Initialize a msg_name from an inbound skb. */ 780 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 781 int *addr_len) 782 { 783 struct sctphdr *sh; 784 struct sockaddr_in6 *sin6; 785 786 if (msgname) { 787 sctp_inet6_msgname(msgname, addr_len); 788 sin6 = (struct sockaddr_in6 *)msgname; 789 sh = sctp_hdr(skb); 790 sin6->sin6_port = sh->source; 791 792 /* Map ipv4 address into v4-mapped-on-v6 address. */ 793 if (sctp_sk(skb->sk)->v4mapped && 794 ip_hdr(skb)->version == 4) { 795 sctp_v4_map_v6((union sctp_addr *)sin6); 796 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr; 797 return; 798 } 799 800 /* Otherwise, just copy the v6 address. */ 801 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 802 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 803 struct sctp_ulpevent *ev = sctp_skb2event(skb); 804 sin6->sin6_scope_id = ev->iif; 805 } 806 } 807 } 808 809 /* Do we support this AF? */ 810 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 811 { 812 switch (family) { 813 case AF_INET6: 814 return 1; 815 /* v4-mapped-v6 addresses */ 816 case AF_INET: 817 if (!__ipv6_only_sock(sctp_opt2sk(sp))) 818 return 1; 819 default: 820 return 0; 821 } 822 } 823 824 /* Address matching with wildcards allowed. This extra level 825 * of indirection lets us choose whether a PF_INET6 should 826 * disallow any v4 addresses if we so choose. 827 */ 828 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 829 const union sctp_addr *addr2, 830 struct sctp_sock *opt) 831 { 832 struct sctp_af *af1, *af2; 833 struct sock *sk = sctp_opt2sk(opt); 834 835 af1 = sctp_get_af_specific(addr1->sa.sa_family); 836 af2 = sctp_get_af_specific(addr2->sa.sa_family); 837 838 if (!af1 || !af2) 839 return 0; 840 841 /* If the socket is IPv6 only, v4 addrs will not match */ 842 if (__ipv6_only_sock(sk) && af1 != af2) 843 return 0; 844 845 /* Today, wildcard AF_INET/AF_INET6. */ 846 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2)) 847 return 1; 848 849 if (addr1->sa.sa_family != addr2->sa.sa_family) 850 return 0; 851 852 return af1->cmp_addr(addr1, addr2); 853 } 854 855 /* Verify that the provided sockaddr looks bindable. Common verification, 856 * has already been taken care of. 857 */ 858 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 859 { 860 struct sctp_af *af; 861 862 /* ASSERT: address family has already been verified. */ 863 if (addr->sa.sa_family != AF_INET6) 864 af = sctp_get_af_specific(addr->sa.sa_family); 865 else { 866 int type = ipv6_addr_type(&addr->v6.sin6_addr); 867 struct net_device *dev; 868 869 if (type & IPV6_ADDR_LINKLOCAL) { 870 if (!addr->v6.sin6_scope_id) 871 return 0; 872 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id); 873 if (!dev) 874 return 0; 875 if (!ipv6_chk_addr(&init_net, &addr->v6.sin6_addr, 876 dev, 0)) { 877 dev_put(dev); 878 return 0; 879 } 880 dev_put(dev); 881 } else if (type == IPV6_ADDR_MAPPED) { 882 if (!opt->v4mapped) 883 return 0; 884 } 885 886 af = opt->pf->af; 887 } 888 return af->available(addr, opt); 889 } 890 891 /* Verify that the provided sockaddr looks sendable. Common verification, 892 * has already been taken care of. 893 */ 894 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 895 { 896 struct sctp_af *af = NULL; 897 898 /* ASSERT: address family has already been verified. */ 899 if (addr->sa.sa_family != AF_INET6) 900 af = sctp_get_af_specific(addr->sa.sa_family); 901 else { 902 int type = ipv6_addr_type(&addr->v6.sin6_addr); 903 struct net_device *dev; 904 905 if (type & IPV6_ADDR_LINKLOCAL) { 906 if (!addr->v6.sin6_scope_id) 907 return 0; 908 dev = dev_get_by_index(&init_net, addr->v6.sin6_scope_id); 909 if (!dev) 910 return 0; 911 dev_put(dev); 912 } 913 af = opt->pf->af; 914 } 915 916 return af != NULL; 917 } 918 919 /* Fill in Supported Address Type information for INIT and INIT-ACK 920 * chunks. Note: In the future, we may want to look at sock options 921 * to determine whether a PF_INET6 socket really wants to have IPV4 922 * addresses. 923 * Returns number of addresses supported. 924 */ 925 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 926 __be16 *types) 927 { 928 types[0] = SCTP_PARAM_IPV6_ADDRESS; 929 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) { 930 types[1] = SCTP_PARAM_IPV4_ADDRESS; 931 return 2; 932 } 933 return 1; 934 } 935 936 static const struct proto_ops inet6_seqpacket_ops = { 937 .family = PF_INET6, 938 .owner = THIS_MODULE, 939 .release = inet6_release, 940 .bind = inet6_bind, 941 .connect = inet_dgram_connect, 942 .socketpair = sock_no_socketpair, 943 .accept = inet_accept, 944 .getname = inet6_getname, 945 .poll = sctp_poll, 946 .ioctl = inet6_ioctl, 947 .listen = sctp_inet_listen, 948 .shutdown = inet_shutdown, 949 .setsockopt = sock_common_setsockopt, 950 .getsockopt = sock_common_getsockopt, 951 .sendmsg = inet_sendmsg, 952 .recvmsg = sock_common_recvmsg, 953 .mmap = sock_no_mmap, 954 #ifdef CONFIG_COMPAT 955 .compat_setsockopt = compat_sock_common_setsockopt, 956 .compat_getsockopt = compat_sock_common_getsockopt, 957 #endif 958 }; 959 960 static struct inet_protosw sctpv6_seqpacket_protosw = { 961 .type = SOCK_SEQPACKET, 962 .protocol = IPPROTO_SCTP, 963 .prot = &sctpv6_prot, 964 .ops = &inet6_seqpacket_ops, 965 .capability = -1, 966 .no_check = 0, 967 .flags = SCTP_PROTOSW_FLAG 968 }; 969 static struct inet_protosw sctpv6_stream_protosw = { 970 .type = SOCK_STREAM, 971 .protocol = IPPROTO_SCTP, 972 .prot = &sctpv6_prot, 973 .ops = &inet6_seqpacket_ops, 974 .capability = -1, 975 .no_check = 0, 976 .flags = SCTP_PROTOSW_FLAG, 977 }; 978 979 static int sctp6_rcv(struct sk_buff *skb) 980 { 981 return sctp_rcv(skb) ? -1 : 0; 982 } 983 984 static struct inet6_protocol sctpv6_protocol = { 985 .handler = sctp6_rcv, 986 .err_handler = sctp_v6_err, 987 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 988 }; 989 990 static struct sctp_af sctp_af_inet6 = { 991 .sa_family = AF_INET6, 992 .sctp_xmit = sctp_v6_xmit, 993 .setsockopt = ipv6_setsockopt, 994 .getsockopt = ipv6_getsockopt, 995 .get_dst = sctp_v6_get_dst, 996 .get_saddr = sctp_v6_get_saddr, 997 .copy_addrlist = sctp_v6_copy_addrlist, 998 .from_skb = sctp_v6_from_skb, 999 .from_sk = sctp_v6_from_sk, 1000 .to_sk_saddr = sctp_v6_to_sk_saddr, 1001 .to_sk_daddr = sctp_v6_to_sk_daddr, 1002 .from_addr_param = sctp_v6_from_addr_param, 1003 .to_addr_param = sctp_v6_to_addr_param, 1004 .dst_saddr = sctp_v6_dst_saddr, 1005 .cmp_addr = sctp_v6_cmp_addr, 1006 .scope = sctp_v6_scope, 1007 .addr_valid = sctp_v6_addr_valid, 1008 .inaddr_any = sctp_v6_inaddr_any, 1009 .is_any = sctp_v6_is_any, 1010 .available = sctp_v6_available, 1011 .skb_iif = sctp_v6_skb_iif, 1012 .is_ce = sctp_v6_is_ce, 1013 .seq_dump_addr = sctp_v6_seq_dump_addr, 1014 .ecn_capable = sctp_v6_ecn_capable, 1015 .net_header_len = sizeof(struct ipv6hdr), 1016 .sockaddr_len = sizeof(struct sockaddr_in6), 1017 #ifdef CONFIG_COMPAT 1018 .compat_setsockopt = compat_ipv6_setsockopt, 1019 .compat_getsockopt = compat_ipv6_getsockopt, 1020 #endif 1021 }; 1022 1023 static struct sctp_pf sctp_pf_inet6 = { 1024 .event_msgname = sctp_inet6_event_msgname, 1025 .skb_msgname = sctp_inet6_skb_msgname, 1026 .af_supported = sctp_inet6_af_supported, 1027 .cmp_addr = sctp_inet6_cmp_addr, 1028 .bind_verify = sctp_inet6_bind_verify, 1029 .send_verify = sctp_inet6_send_verify, 1030 .supported_addrs = sctp_inet6_supported_addrs, 1031 .create_accept_sk = sctp_v6_create_accept_sk, 1032 .addr_v4map = sctp_v6_addr_v4map, 1033 .af = &sctp_af_inet6, 1034 }; 1035 1036 /* Initialize IPv6 support and register with socket layer. */ 1037 void sctp_v6_pf_init(void) 1038 { 1039 /* Register the SCTP specific PF_INET6 functions. */ 1040 sctp_register_pf(&sctp_pf_inet6, PF_INET6); 1041 1042 /* Register the SCTP specific AF_INET6 functions. */ 1043 sctp_register_af(&sctp_af_inet6); 1044 } 1045 1046 void sctp_v6_pf_exit(void) 1047 { 1048 list_del(&sctp_af_inet6.list); 1049 } 1050 1051 /* Initialize IPv6 support and register with socket layer. */ 1052 int sctp_v6_protosw_init(void) 1053 { 1054 int rc; 1055 1056 rc = proto_register(&sctpv6_prot, 1); 1057 if (rc) 1058 return rc; 1059 1060 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 1061 inet6_register_protosw(&sctpv6_seqpacket_protosw); 1062 inet6_register_protosw(&sctpv6_stream_protosw); 1063 1064 return 0; 1065 } 1066 1067 void sctp_v6_protosw_exit(void) 1068 { 1069 inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1070 inet6_unregister_protosw(&sctpv6_stream_protosw); 1071 proto_unregister(&sctpv6_prot); 1072 } 1073 1074 1075 /* Register with inet6 layer. */ 1076 int sctp_v6_add_protocol(void) 1077 { 1078 /* Register notifier for inet6 address additions/deletions. */ 1079 register_inet6addr_notifier(&sctp_inet6addr_notifier); 1080 1081 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 1082 return -EAGAIN; 1083 1084 return 0; 1085 } 1086 1087 /* Unregister with inet6 layer. */ 1088 void sctp_v6_del_protocol(void) 1089 { 1090 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1091 unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 1092 } 1093