1/* SCTP kernel reference Implementation 2 * (C) Copyright IBM Corp. 2002, 2004 3 * Copyright (c) 2001 Nokia, Inc. 4 * Copyright (c) 2001 La Monte H.P. Yarroll 5 * Copyright (c) 2002-2003 Intel Corp. 6 * 7 * This file is part of the SCTP kernel reference Implementation 8 * 9 * SCTP over IPv6. 10 * 11 * The SCTP reference implementation is free software; 12 * you can redistribute it and/or modify it under the terms of 13 * the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * The SCTP reference implementation is distributed in the hope that it 18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 19 * ************************ 20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 21 * See the GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with GNU CC; see the file COPYING. If not, write to 25 * the Free Software Foundation, 59 Temple Place - Suite 330, 26 * Boston, MA 02111-1307, USA. 27 * 28 * Please send any bug reports or fixes you make to the 29 * email address(es): 30 * lksctp developers <lksctp-developers@lists.sourceforge.net> 31 * 32 * Or submit a bug report through the following website: 33 * http://www.sf.net/projects/lksctp 34 * 35 * Written or modified by: 36 * Le Yanqun <yanqun.le@nokia.com> 37 * Hui Huang <hui.huang@nokia.com> 38 * La Monte H.P. Yarroll <piggy@acm.org> 39 * Sridhar Samudrala <sri@us.ibm.com> 40 * Jon Grimm <jgrimm@us.ibm.com> 41 * Ardelle Fan <ardelle.fan@intel.com> 42 * 43 * Based on: 44 * linux/net/ipv6/tcp_ipv6.c 45 * 46 * Any bugs reported given to us we will try to fix... any fixes shared will 47 * be incorporated into the next SCTP release. 48 */ 49 50#include <linux/module.h> 51#include <linux/errno.h> 52#include <linux/types.h> 53#include <linux/socket.h> 54#include <linux/sockios.h> 55#include <linux/net.h> 56#include <linux/in.h> 57#include <linux/in6.h> 58#include <linux/netdevice.h> 59#include <linux/init.h> 60#include <linux/ipsec.h> 61 62#include <linux/ipv6.h> 63#include <linux/icmpv6.h> 64#include <linux/random.h> 65#include <linux/seq_file.h> 66 67#include <net/protocol.h> 68#include <net/ndisc.h> 69#include <net/ip.h> 70#include <net/ipv6.h> 71#include <net/transp_v6.h> 72#include <net/addrconf.h> 73#include <net/ip6_route.h> 74#include <net/inet_common.h> 75#include <net/inet_ecn.h> 76#include <net/sctp/sctp.h> 77 78#include <asm/uaccess.h> 79 80/* Event handler for inet6 address addition/deletion events. */ 81static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, 82 void *ptr) 83{ 84 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; 85 struct sctp_sockaddr_entry *addr; 86 struct list_head *pos, *temp; 87 88 switch (ev) { 89 case NETDEV_UP: 90 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 91 if (addr) { 92 addr->a.v6.sin6_family = AF_INET6; 93 addr->a.v6.sin6_port = 0; 94 memcpy(&addr->a.v6.sin6_addr, &ifa->addr, 95 sizeof(struct in6_addr)); 96 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; 97 list_add_tail(&addr->list, &sctp_local_addr_list); 98 } 99 break; 100 case NETDEV_DOWN: 101 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 102 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 103 if (ipv6_addr_equal(&addr->a.v6.sin6_addr, &ifa->addr)) { 104 list_del(pos); 105 kfree(addr); 106 break; 107 } 108 } 109 110 break; 111 } 112 113 return NOTIFY_DONE; 114} 115 116static struct notifier_block sctp_inet6addr_notifier = { 117 .notifier_call = sctp_inet6addr_event, 118}; 119 120/* ICMP error handler. */ 121SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 122 int type, int code, int offset, __be32 info) 123{ 124 struct inet6_dev *idev; 125 struct sock *sk; 126 struct sctp_association *asoc; 127 struct sctp_transport *transport; 128 struct ipv6_pinfo *np; 129 sk_buff_data_t saveip, savesctp; 130 int err; 131 132 idev = in6_dev_get(skb->dev); 133 134 /* Fix up skb to look at the embedded net header. */ 135 saveip = skb->network_header; 136 savesctp = skb->transport_header; 137 skb_reset_network_header(skb); 138 skb_set_transport_header(skb, offset); 139 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport); 140 /* Put back, the original pointers. */ 141 skb->network_header = saveip; 142 skb->transport_header = savesctp; 143 if (!sk) { 144 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); 145 goto out; 146 } 147 148 /* Warning: The sock lock is held. Remember to call 149 * sctp_err_finish! 150 */ 151 152 switch (type) { 153 case ICMPV6_PKT_TOOBIG: 154 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); 155 goto out_unlock; 156 case ICMPV6_PARAMPROB: 157 if (ICMPV6_UNK_NEXTHDR == code) { 158 sctp_icmp_proto_unreachable(sk, asoc, transport); 159 goto out_unlock; 160 } 161 break; 162 default: 163 break; 164 } 165 166 np = inet6_sk(sk); 167 icmpv6_err_convert(type, code, &err); 168 if (!sock_owned_by_user(sk) && np->recverr) { 169 sk->sk_err = err; 170 sk->sk_error_report(sk); 171 } else { /* Only an error on timeout */ 172 sk->sk_err_soft = err; 173 } 174 175out_unlock: 176 sctp_err_finish(sk, asoc); 177out: 178 if (likely(idev != NULL)) 179 in6_dev_put(idev); 180} 181 182/* Based on tcp_v6_xmit() in tcp_ipv6.c. */ 183static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport, 184 int ipfragok) 185{ 186 struct sock *sk = skb->sk; 187 struct ipv6_pinfo *np = inet6_sk(sk); 188 struct flowi fl; 189 190 memset(&fl, 0, sizeof(fl)); 191 192 fl.proto = sk->sk_protocol; 193 194 /* Fill in the dest address from the route entry passed with the skb 195 * and the source address from the transport. 196 */ 197 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr); 198 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr); 199 200 fl.fl6_flowlabel = np->flow_label; 201 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); 202 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL) 203 fl.oif = transport->saddr.v6.sin6_scope_id; 204 else 205 fl.oif = sk->sk_bound_dev_if; 206 207 if (np->opt && np->opt->srcrt) { 208 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 209 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 210 } 211 212 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " 213 "src:" NIP6_FMT " dst:" NIP6_FMT "\n", 214 __FUNCTION__, skb, skb->len, 215 NIP6(fl.fl6_src), NIP6(fl.fl6_dst)); 216 217 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 218 219 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok); 220} 221 222/* Returns the dst cache entry for the given source and destination ip 223 * addresses. 224 */ 225static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, 226 union sctp_addr *daddr, 227 union sctp_addr *saddr) 228{ 229 struct dst_entry *dst; 230 struct flowi fl; 231 232 memset(&fl, 0, sizeof(fl)); 233 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); 234 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 235 fl.oif = daddr->v6.sin6_scope_id; 236 237 238 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ", 239 __FUNCTION__, NIP6(fl.fl6_dst)); 240 241 if (saddr) { 242 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); 243 SCTP_DEBUG_PRINTK( 244 "SRC=" NIP6_FMT " - ", 245 NIP6(fl.fl6_src)); 246 } 247 248 dst = ip6_route_output(NULL, &fl); 249 if (!dst->error) { 250 struct rt6_info *rt; 251 rt = (struct rt6_info *)dst; 252 SCTP_DEBUG_PRINTK( 253 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n", 254 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr)); 255 return dst; 256 } 257 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 258 dst_release(dst); 259 return NULL; 260} 261 262/* Returns the number of consecutive initial bits that match in the 2 ipv6 263 * addresses. 264 */ 265static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 266 union sctp_addr *s2) 267{ 268 struct in6_addr *a1 = &s1->v6.sin6_addr; 269 struct in6_addr *a2 = &s2->v6.sin6_addr; 270 int i, j; 271 272 for (i = 0; i < 4 ; i++) { 273 __be32 a1xora2; 274 275 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; 276 277 if ((j = fls(ntohl(a1xora2)))) 278 return (i * 32 + 32 - j); 279 } 280 281 return (i*32); 282} 283 284/* Fills in the source address(saddr) based on the destination address(daddr) 285 * and asoc's bind address list. 286 */ 287static void sctp_v6_get_saddr(struct sctp_association *asoc, 288 struct dst_entry *dst, 289 union sctp_addr *daddr, 290 union sctp_addr *saddr) 291{ 292 struct sctp_bind_addr *bp; 293 rwlock_t *addr_lock; 294 struct sctp_sockaddr_entry *laddr; 295 struct list_head *pos; 296 sctp_scope_t scope; 297 union sctp_addr *baddr = NULL; 298 __u8 matchlen = 0; 299 __u8 bmatchlen; 300 301 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p " 302 "daddr:" NIP6_FMT " ", 303 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr)); 304 305 if (!asoc) { 306 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr); 307 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n", 308 NIP6(saddr->v6.sin6_addr)); 309 return; 310 } 311 312 scope = sctp_scope(daddr); 313 314 bp = &asoc->base.bind_addr; 315 addr_lock = &asoc->base.addr_lock; 316 317 /* Go through the bind address list and find the best source address 318 * that matches the scope of the destination address. 319 */ 320 sctp_read_lock(addr_lock); 321 list_for_each(pos, &bp->address_list) { 322 laddr = list_entry(pos, struct sctp_sockaddr_entry, list); 323 if ((laddr->use_as_src) && 324 (laddr->a.sa.sa_family == AF_INET6) && 325 (scope <= sctp_scope(&laddr->a))) { 326 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 327 if (!baddr || (matchlen < bmatchlen)) { 328 baddr = &laddr->a; 329 matchlen = bmatchlen; 330 } 331 } 332 } 333 334 if (baddr) { 335 memcpy(saddr, baddr, sizeof(union sctp_addr)); 336 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n", 337 NIP6(saddr->v6.sin6_addr)); 338 } else { 339 printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 340 "address for the dest:" NIP6_FMT "\n", 341 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr)); 342 } 343 344 sctp_read_unlock(addr_lock); 345} 346 347/* Make a copy of all potential local addresses. */ 348static void sctp_v6_copy_addrlist(struct list_head *addrlist, 349 struct net_device *dev) 350{ 351 struct inet6_dev *in6_dev; 352 struct inet6_ifaddr *ifp; 353 struct sctp_sockaddr_entry *addr; 354 355 rcu_read_lock(); 356 if ((in6_dev = __in6_dev_get(dev)) == NULL) { 357 rcu_read_unlock(); 358 return; 359 } 360 361 read_lock_bh(&in6_dev->lock); 362 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { 363 /* Add the address to the local list. */ 364 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 365 if (addr) { 366 addr->a.v6.sin6_family = AF_INET6; 367 addr->a.v6.sin6_port = 0; 368 addr->a.v6.sin6_addr = ifp->addr; 369 addr->a.v6.sin6_scope_id = dev->ifindex; 370 INIT_LIST_HEAD(&addr->list); 371 list_add_tail(&addr->list, addrlist); 372 } 373 } 374 375 read_unlock_bh(&in6_dev->lock); 376 rcu_read_unlock(); 377} 378 379/* Initialize a sockaddr_storage from in incoming skb. */ 380static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 381 int is_saddr) 382{ 383 void *from; 384 __be16 *port; 385 struct sctphdr *sh; 386 387 port = &addr->v6.sin6_port; 388 addr->v6.sin6_family = AF_INET6; 389 addr->v6.sin6_flowinfo = 0; 390 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 391 392 sh = sctp_hdr(skb); 393 if (is_saddr) { 394 *port = sh->source; 395 from = &ipv6_hdr(skb)->saddr; 396 } else { 397 *port = sh->dest; 398 from = &ipv6_hdr(skb)->daddr; 399 } 400 ipv6_addr_copy(&addr->v6.sin6_addr, from); 401} 402 403/* Initialize an sctp_addr from a socket. */ 404static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 405{ 406 addr->v6.sin6_family = AF_INET6; 407 addr->v6.sin6_port = 0; 408 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; 409} 410 411/* Initialize sk->sk_rcv_saddr from sctp_addr. */ 412static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 413{ 414 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 415 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 416 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 417 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 418 inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 419 addr->v4.sin_addr.s_addr; 420 } else { 421 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; 422 } 423} 424 425/* Initialize sk->sk_daddr from sctp_addr. */ 426static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 427{ 428 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 429 inet6_sk(sk)->daddr.s6_addr32[0] = 0; 430 inet6_sk(sk)->daddr.s6_addr32[1] = 0; 431 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 432 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 433 } else { 434 inet6_sk(sk)->daddr = addr->v6.sin6_addr; 435 } 436} 437 438/* Initialize a sctp_addr from an address parameter. */ 439static void sctp_v6_from_addr_param(union sctp_addr *addr, 440 union sctp_addr_param *param, 441 __be16 port, int iif) 442{ 443 addr->v6.sin6_family = AF_INET6; 444 addr->v6.sin6_port = port; 445 addr->v6.sin6_flowinfo = 0; /* BUG */ 446 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 447 addr->v6.sin6_scope_id = iif; 448} 449 450/* Initialize an address parameter from a sctp_addr and return the length 451 * of the address parameter. 452 */ 453static int sctp_v6_to_addr_param(const union sctp_addr *addr, 454 union sctp_addr_param *param) 455{ 456 int length = sizeof(sctp_ipv6addr_param_t); 457 458 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 459 param->v6.param_hdr.length = htons(length); 460 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 461 462 return length; 463} 464 465/* Initialize a sctp_addr from a dst_entry. */ 466static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 467 __be16 port) 468{ 469 struct rt6_info *rt = (struct rt6_info *)dst; 470 addr->sa.sa_family = AF_INET6; 471 addr->v6.sin6_port = port; 472 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 473} 474 475/* Compare addresses exactly. 476 * v4-mapped-v6 is also in consideration. 477 */ 478static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 479 const union sctp_addr *addr2) 480{ 481 if (addr1->sa.sa_family != addr2->sa.sa_family) { 482 if (addr1->sa.sa_family == AF_INET && 483 addr2->sa.sa_family == AF_INET6 && 484 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) { 485 if (addr2->v6.sin6_port == addr1->v4.sin_port && 486 addr2->v6.sin6_addr.s6_addr32[3] == 487 addr1->v4.sin_addr.s_addr) 488 return 1; 489 } 490 if (addr2->sa.sa_family == AF_INET && 491 addr1->sa.sa_family == AF_INET6 && 492 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) { 493 if (addr1->v6.sin6_port == addr2->v4.sin_port && 494 addr1->v6.sin6_addr.s6_addr32[3] == 495 addr2->v4.sin_addr.s_addr) 496 return 1; 497 } 498 return 0; 499 } 500 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 501 return 0; 502 /* If this is a linklocal address, compare the scope_id. */ 503 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 504 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 505 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 506 return 0; 507 } 508 } 509 510 return 1; 511} 512 513/* Initialize addr struct to INADDR_ANY. */ 514static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) 515{ 516 memset(addr, 0x00, sizeof(union sctp_addr)); 517 addr->v6.sin6_family = AF_INET6; 518 addr->v6.sin6_port = port; 519} 520 521/* Is this a wildcard address? */ 522static int sctp_v6_is_any(const union sctp_addr *addr) 523{ 524 return ipv6_addr_any(&addr->v6.sin6_addr); 525} 526 527/* Should this be available for binding? */ 528static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 529{ 530 int type; 531 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 532 533 type = ipv6_addr_type(in6); 534 if (IPV6_ADDR_ANY == type) 535 return 1; 536 if (type == IPV6_ADDR_MAPPED) { 537 if (sp && !sp->v4mapped) 538 return 0; 539 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 540 return 0; 541 sctp_v6_map_v4(addr); 542 return sctp_get_af_specific(AF_INET)->available(addr, sp); 543 } 544 if (!(type & IPV6_ADDR_UNICAST)) 545 return 0; 546 547 return ipv6_chk_addr(in6, NULL, 0); 548} 549 550/* This function checks if the address is a valid address to be used for 551 * SCTP. 552 * 553 * Output: 554 * Return 0 - If the address is a non-unicast or an illegal address. 555 * Return 1 - If the address is a unicast. 556 */ 557static int sctp_v6_addr_valid(union sctp_addr *addr, 558 struct sctp_sock *sp, 559 const struct sk_buff *skb) 560{ 561 int ret = ipv6_addr_type(&addr->v6.sin6_addr); 562 563 /* Support v4-mapped-v6 address. */ 564 if (ret == IPV6_ADDR_MAPPED) { 565 /* Note: This routine is used in input, so v4-mapped-v6 566 * are disallowed here when there is no sctp_sock. 567 */ 568 if (!sp || !sp->v4mapped) 569 return 0; 570 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 571 return 0; 572 sctp_v6_map_v4(addr); 573 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 574 } 575 576 /* Is this a non-unicast address */ 577 if (!(ret & IPV6_ADDR_UNICAST)) 578 return 0; 579 580 return 1; 581} 582 583/* What is the scope of 'addr'? */ 584static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 585{ 586 int v6scope; 587 sctp_scope_t retval; 588 589 /* The IPv6 scope is really a set of bit fields. 590 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 591 */ 592 593 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 594 switch (v6scope) { 595 case IFA_HOST: 596 retval = SCTP_SCOPE_LOOPBACK; 597 break; 598 case IFA_LINK: 599 retval = SCTP_SCOPE_LINK; 600 break; 601 case IFA_SITE: 602 retval = SCTP_SCOPE_PRIVATE; 603 break; 604 default: 605 retval = SCTP_SCOPE_GLOBAL; 606 break; 607 } 608 609 return retval; 610} 611 612/* Create and initialize a new sk for the socket to be returned by accept(). */ 613static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 614 struct sctp_association *asoc) 615{ 616 struct inet_sock *inet = inet_sk(sk); 617 struct sock *newsk; 618 struct inet_sock *newinet; 619 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 620 struct sctp6_sock *newsctp6sk; 621 622 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1); 623 if (!newsk) 624 goto out; 625 626 sock_init_data(NULL, newsk); 627 628 newsk->sk_type = SOCK_STREAM; 629 630 newsk->sk_prot = sk->sk_prot; 631 newsk->sk_no_check = sk->sk_no_check; 632 newsk->sk_reuse = sk->sk_reuse; 633 634 newsk->sk_destruct = inet_sock_destruct; 635 newsk->sk_family = PF_INET6; 636 newsk->sk_protocol = IPPROTO_SCTP; 637 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 638 newsk->sk_shutdown = sk->sk_shutdown; 639 sock_reset_flag(sk, SOCK_ZAPPED); 640 641 newsctp6sk = (struct sctp6_sock *)newsk; 642 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 643 644 newinet = inet_sk(newsk); 645 newnp = inet6_sk(newsk); 646 647 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 648 649 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 650 * and getpeername(). 651 */ 652 newinet->sport = inet->sport; 653 newnp->saddr = np->saddr; 654 newnp->rcv_saddr = np->rcv_saddr; 655 newinet->dport = htons(asoc->peer.port); 656 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 657 658 /* Init the ipv4 part of the socket since we can have sockets 659 * using v6 API for ipv4. 660 */ 661 newinet->uc_ttl = -1; 662 newinet->mc_loop = 1; 663 newinet->mc_ttl = 1; 664 newinet->mc_index = 0; 665 newinet->mc_list = NULL; 666 667 if (ipv4_config.no_pmtu_disc) 668 newinet->pmtudisc = IP_PMTUDISC_DONT; 669 else 670 newinet->pmtudisc = IP_PMTUDISC_WANT; 671 672 sk_refcnt_debug_inc(newsk); 673 674 if (newsk->sk_prot->init(newsk)) { 675 sk_common_release(newsk); 676 newsk = NULL; 677 } 678 679out: 680 return newsk; 681} 682 683/* Map v4 address to mapped v6 address */ 684static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 685{ 686 if (sp->v4mapped && AF_INET == addr->sa.sa_family) 687 sctp_v4_map_v6(addr); 688} 689 690/* Where did this skb come from? */ 691static int sctp_v6_skb_iif(const struct sk_buff *skb) 692{ 693 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 694 return opt->iif; 695} 696 697/* Was this packet marked by Explicit Congestion Notification? */ 698static int sctp_v6_is_ce(const struct sk_buff *skb) 699{ 700 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20); 701} 702 703/* Dump the v6 addr to the seq file. */ 704static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 705{ 706 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr)); 707} 708 709/* Initialize a PF_INET6 socket msg_name. */ 710static void sctp_inet6_msgname(char *msgname, int *addr_len) 711{ 712 struct sockaddr_in6 *sin6; 713 714 sin6 = (struct sockaddr_in6 *)msgname; 715 sin6->sin6_family = AF_INET6; 716 sin6->sin6_flowinfo = 0; 717 sin6->sin6_scope_id = 0; 718 *addr_len = sizeof(struct sockaddr_in6); 719} 720 721/* Initialize a PF_INET msgname from a ulpevent. */ 722static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 723 char *msgname, int *addrlen) 724{ 725 struct sockaddr_in6 *sin6, *sin6from; 726 727 if (msgname) { 728 union sctp_addr *addr; 729 struct sctp_association *asoc; 730 731 asoc = event->asoc; 732 sctp_inet6_msgname(msgname, addrlen); 733 sin6 = (struct sockaddr_in6 *)msgname; 734 sin6->sin6_port = htons(asoc->peer.port); 735 addr = &asoc->peer.primary_addr; 736 737 /* Note: If we go to a common v6 format, this code 738 * will change. 739 */ 740 741 /* Map ipv4 address into v4-mapped-on-v6 address. */ 742 if (sctp_sk(asoc->base.sk)->v4mapped && 743 AF_INET == addr->sa.sa_family) { 744 sctp_v4_map_v6((union sctp_addr *)sin6); 745 sin6->sin6_addr.s6_addr32[3] = 746 addr->v4.sin_addr.s_addr; 747 return; 748 } 749 750 sin6from = &asoc->peer.primary_addr.v6; 751 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 752 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 753 sin6->sin6_scope_id = sin6from->sin6_scope_id; 754 } 755} 756 757/* Initialize a msg_name from an inbound skb. */ 758static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 759 int *addr_len) 760{ 761 struct sctphdr *sh; 762 struct sockaddr_in6 *sin6; 763 764 if (msgname) { 765 sctp_inet6_msgname(msgname, addr_len); 766 sin6 = (struct sockaddr_in6 *)msgname; 767 sh = sctp_hdr(skb); 768 sin6->sin6_port = sh->source; 769 770 /* Map ipv4 address into v4-mapped-on-v6 address. */ 771 if (sctp_sk(skb->sk)->v4mapped && 772 ip_hdr(skb)->version == 4) { 773 sctp_v4_map_v6((union sctp_addr *)sin6); 774 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr; 775 return; 776 } 777 778 /* Otherwise, just copy the v6 address. */ 779 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 780 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 781 struct sctp_ulpevent *ev = sctp_skb2event(skb); 782 sin6->sin6_scope_id = ev->iif; 783 } 784 } 785} 786 787/* Do we support this AF? */ 788static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 789{ 790 switch (family) { 791 case AF_INET6: 792 return 1; 793 /* v4-mapped-v6 addresses */ 794 case AF_INET: 795 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped) 796 return 1; 797 default: 798 return 0; 799 } 800} 801 802/* Address matching with wildcards allowed. This extra level 803 * of indirection lets us choose whether a PF_INET6 should 804 * disallow any v4 addresses if we so choose. 805 */ 806static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 807 const union sctp_addr *addr2, 808 struct sctp_sock *opt) 809{ 810 struct sctp_af *af1, *af2; 811 812 af1 = sctp_get_af_specific(addr1->sa.sa_family); 813 af2 = sctp_get_af_specific(addr2->sa.sa_family); 814 815 if (!af1 || !af2) 816 return 0; 817 /* Today, wildcard AF_INET/AF_INET6. */ 818 if (sctp_is_any(addr1) || sctp_is_any(addr2)) 819 return 1; 820 821 if (addr1->sa.sa_family != addr2->sa.sa_family) 822 return 0; 823 824 return af1->cmp_addr(addr1, addr2); 825} 826 827/* Verify that the provided sockaddr looks bindable. Common verification, 828 * has already been taken care of. 829 */ 830static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 831{ 832 struct sctp_af *af; 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 if (!ipv6_chk_addr(&addr->v6.sin6_addr, dev, 0)) { 848 dev_put(dev); 849 return 0; 850 } 851 dev_put(dev); 852 } 853 af = opt->pf->af; 854 } 855 return af->available(addr, opt); 856} 857 858/* Verify that the provided sockaddr looks sendable. Common verification, 859 * has already been taken care of. 860 */ 861static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 862{ 863 struct sctp_af *af = NULL; 864 865 /* ASSERT: address family has already been verified. */ 866 if (addr->sa.sa_family != AF_INET6) 867 af = sctp_get_af_specific(addr->sa.sa_family); 868 else { 869 int type = ipv6_addr_type(&addr->v6.sin6_addr); 870 struct net_device *dev; 871 872 if (type & IPV6_ADDR_LINKLOCAL) { 873 if (!addr->v6.sin6_scope_id) 874 return 0; 875 dev = dev_get_by_index(addr->v6.sin6_scope_id); 876 if (!dev) 877 return 0; 878 dev_put(dev); 879 } 880 af = opt->pf->af; 881 } 882 883 return af != NULL; 884} 885 886/* Fill in Supported Address Type information for INIT and INIT-ACK 887 * chunks. Note: In the future, we may want to look at sock options 888 * to determine whether a PF_INET6 socket really wants to have IPV4 889 * addresses. 890 * Returns number of addresses supported. 891 */ 892static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 893 __be16 *types) 894{ 895 types[0] = SCTP_PARAM_IPV4_ADDRESS; 896 types[1] = SCTP_PARAM_IPV6_ADDRESS; 897 return 2; 898} 899 900static const struct proto_ops inet6_seqpacket_ops = { 901 .family = PF_INET6, 902 .owner = THIS_MODULE, 903 .release = inet6_release, 904 .bind = inet6_bind, 905 .connect = inet_dgram_connect, 906 .socketpair = sock_no_socketpair, 907 .accept = inet_accept, 908 .getname = inet6_getname, 909 .poll = sctp_poll, 910 .ioctl = inet6_ioctl, 911 .listen = sctp_inet_listen, 912 .shutdown = inet_shutdown, 913 .setsockopt = sock_common_setsockopt, 914 .getsockopt = sock_common_getsockopt, 915 .sendmsg = inet_sendmsg, 916 .recvmsg = sock_common_recvmsg, 917 .mmap = sock_no_mmap, 918#ifdef CONFIG_COMPAT 919 .compat_setsockopt = compat_sock_common_setsockopt, 920 .compat_getsockopt = compat_sock_common_getsockopt, 921#endif 922}; 923 924static struct inet_protosw sctpv6_seqpacket_protosw = { 925 .type = SOCK_SEQPACKET, 926 .protocol = IPPROTO_SCTP, 927 .prot = &sctpv6_prot, 928 .ops = &inet6_seqpacket_ops, 929 .capability = -1, 930 .no_check = 0, 931 .flags = SCTP_PROTOSW_FLAG 932}; 933static struct inet_protosw sctpv6_stream_protosw = { 934 .type = SOCK_STREAM, 935 .protocol = IPPROTO_SCTP, 936 .prot = &sctpv6_prot, 937 .ops = &inet6_seqpacket_ops, 938 .capability = -1, 939 .no_check = 0, 940 .flags = SCTP_PROTOSW_FLAG, 941}; 942 943static int sctp6_rcv(struct sk_buff **pskb) 944{ 945 return sctp_rcv(*pskb) ? -1 : 0; 946} 947 948static struct inet6_protocol sctpv6_protocol = { 949 .handler = sctp6_rcv, 950 .err_handler = sctp_v6_err, 951 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 952}; 953 954static struct sctp_af sctp_ipv6_specific = { 955 .sa_family = AF_INET6, 956 .sctp_xmit = sctp_v6_xmit, 957 .setsockopt = ipv6_setsockopt, 958 .getsockopt = ipv6_getsockopt, 959 .get_dst = sctp_v6_get_dst, 960 .get_saddr = sctp_v6_get_saddr, 961 .copy_addrlist = sctp_v6_copy_addrlist, 962 .from_skb = sctp_v6_from_skb, 963 .from_sk = sctp_v6_from_sk, 964 .to_sk_saddr = sctp_v6_to_sk_saddr, 965 .to_sk_daddr = sctp_v6_to_sk_daddr, 966 .from_addr_param = sctp_v6_from_addr_param, 967 .to_addr_param = sctp_v6_to_addr_param, 968 .dst_saddr = sctp_v6_dst_saddr, 969 .cmp_addr = sctp_v6_cmp_addr, 970 .scope = sctp_v6_scope, 971 .addr_valid = sctp_v6_addr_valid, 972 .inaddr_any = sctp_v6_inaddr_any, 973 .is_any = sctp_v6_is_any, 974 .available = sctp_v6_available, 975 .skb_iif = sctp_v6_skb_iif, 976 .is_ce = sctp_v6_is_ce, 977 .seq_dump_addr = sctp_v6_seq_dump_addr, 978 .net_header_len = sizeof(struct ipv6hdr), 979 .sockaddr_len = sizeof(struct sockaddr_in6), 980#ifdef CONFIG_COMPAT 981 .compat_setsockopt = compat_ipv6_setsockopt, 982 .compat_getsockopt = compat_ipv6_getsockopt, 983#endif 984}; 985 986static struct sctp_pf sctp_pf_inet6_specific = { 987 .event_msgname = sctp_inet6_event_msgname, 988 .skb_msgname = sctp_inet6_skb_msgname, 989 .af_supported = sctp_inet6_af_supported, 990 .cmp_addr = sctp_inet6_cmp_addr, 991 .bind_verify = sctp_inet6_bind_verify, 992 .send_verify = sctp_inet6_send_verify, 993 .supported_addrs = sctp_inet6_supported_addrs, 994 .create_accept_sk = sctp_v6_create_accept_sk, 995 .addr_v4map = sctp_v6_addr_v4map, 996 .af = &sctp_ipv6_specific, 997}; 998 999/* Initialize IPv6 support and register with socket layer. */ 1000int sctp_v6_init(void) 1001{ 1002 int rc; 1003 1004 /* Register the SCTP specific PF_INET6 functions. */ 1005 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6); 1006 1007 /* Register the SCTP specific AF_INET6 functions. */ 1008 sctp_register_af(&sctp_ipv6_specific); 1009 1010 rc = proto_register(&sctpv6_prot, 1); 1011 if (rc) 1012 return rc; 1013 1014 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 1015 inet6_register_protosw(&sctpv6_seqpacket_protosw); 1016 inet6_register_protosw(&sctpv6_stream_protosw); 1017 1018 return 0; 1019} 1020 1021/* Register with inet6 layer. */ 1022int sctp_v6_add_protocol(void) 1023{ 1024 /* Register notifier for inet6 address additions/deletions. */ 1025 register_inet6addr_notifier(&sctp_inet6addr_notifier); 1026 1027 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 1028 return -EAGAIN; 1029 1030 return 0; 1031} 1032 1033/* IPv6 specific exit support. */ 1034void sctp_v6_exit(void) 1035{ 1036 inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1037 inet6_unregister_protosw(&sctpv6_stream_protosw); 1038 proto_unregister(&sctpv6_prot); 1039 list_del(&sctp_ipv6_specific.list); 1040} 1041 1042/* Unregister with inet6 layer. */ 1043void sctp_v6_del_protocol(void) 1044{ 1045 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1046 unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 1047} 1048