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#include <linux/slab.h> 62 63#include <linux/ipv6.h> 64#include <linux/icmpv6.h> 65#include <linux/random.h> 66#include <linux/seq_file.h> 67 68#include <net/protocol.h> 69#include <net/ndisc.h> 70#include <net/ip.h> 71#include <net/ipv6.h> 72#include <net/transp_v6.h> 73#include <net/addrconf.h> 74#include <net/ip6_route.h> 75#include <net/inet_common.h> 76#include <net/inet_ecn.h> 77#include <net/sctp/sctp.h> 78 79#include <asm/uaccess.h> 80 81/* Event handler for inet6 address addition/deletion events. 82 * The sctp_local_addr_list needs to be protocted by a spin lock since 83 * multiple notifiers (say IPv4 and IPv6) may be running at the same 84 * time and thus corrupt the list. 85 * The reader side is protected with RCU. 86 */ 87static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, 88 void *ptr) 89{ 90 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; 91 struct sctp_sockaddr_entry *addr = NULL; 92 struct sctp_sockaddr_entry *temp; 93 int found = 0; 94 95 switch (ev) { 96 case NETDEV_UP: 97 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 98 if (addr) { 99 addr->a.v6.sin6_family = AF_INET6; 100 addr->a.v6.sin6_port = 0; 101 ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifa->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 131static struct notifier_block sctp_inet6addr_notifier = { 132 .notifier_call = sctp_inet6addr_event, 133}; 134 135/* ICMP error handler. */ 136SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 137 u8 type, u8 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 190out_unlock: 191 sctp_err_finish(sk, asoc); 192out: 193 if (likely(idev != NULL)) 194 in6_dev_put(idev); 195} 196 197/* Based on tcp_v6_xmit() in tcp_ipv6.c. */ 198static 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); 236} 237 238/* Returns the dst cache entry for the given source and destination ip 239 * addresses. 240 */ 241static 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 */ 277static inline int sctp_v6_addr_match_len(union sctp_addr *s1, 278 union sctp_addr *s2) 279{ 280 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr); 281} 282 283/* Fills in the source address(saddr) based on the destination address(daddr) 284 * and asoc's bind address list. 285 */ 286static void sctp_v6_get_saddr(struct sctp_sock *sk, 287 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 struct sctp_sockaddr_entry *laddr; 294 sctp_scope_t scope; 295 union sctp_addr *baddr = NULL; 296 __u8 matchlen = 0; 297 __u8 bmatchlen; 298 299 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p daddr:%pI6 ", 300 __func__, asoc, dst, &daddr->v6.sin6_addr); 301 302 if (!asoc) { 303 ipv6_dev_get_saddr(sock_net(sctp_opt2sk(sk)), 304 dst ? ip6_dst_idev(dst)->dev : NULL, 305 &daddr->v6.sin6_addr, 306 inet6_sk(&sk->inet.sk)->srcprefs, 307 &saddr->v6.sin6_addr); 308 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: %pI6\n", 309 &saddr->v6.sin6_addr); 310 return; 311 } 312 313 scope = sctp_scope(daddr); 314 315 bp = &asoc->base.bind_addr; 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 rcu_read_lock(); 321 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 322 if (!laddr->valid) 323 continue; 324 if ((laddr->state == SCTP_ADDR_SRC) && 325 (laddr->a.sa.sa_family == AF_INET6) && 326 (scope <= sctp_scope(&laddr->a))) { 327 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); 328 if (!baddr || (matchlen < bmatchlen)) { 329 baddr = &laddr->a; 330 matchlen = bmatchlen; 331 } 332 } 333 } 334 335 if (baddr) { 336 memcpy(saddr, baddr, sizeof(union sctp_addr)); 337 SCTP_DEBUG_PRINTK("saddr: %pI6\n", &saddr->v6.sin6_addr); 338 } else { 339 printk(KERN_ERR "%s: asoc:%p Could not find a valid source " 340 "address for the dest:%pI6\n", 341 __func__, asoc, &daddr->v6.sin6_addr); 342 } 343 344 rcu_read_unlock(); 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 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) { 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 ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifp->addr); 369 addr->a.v6.sin6_scope_id = dev->ifindex; 370 addr->valid = 1; 371 INIT_LIST_HEAD(&addr->list); 372 list_add_tail(&addr->list, addrlist); 373 } 374 } 375 376 read_unlock_bh(&in6_dev->lock); 377 rcu_read_unlock(); 378} 379 380/* Initialize a sockaddr_storage from in incoming skb. */ 381static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, 382 int is_saddr) 383{ 384 void *from; 385 __be16 *port; 386 struct sctphdr *sh; 387 388 port = &addr->v6.sin6_port; 389 addr->v6.sin6_family = AF_INET6; 390 addr->v6.sin6_flowinfo = 0; 391 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; 392 393 sh = sctp_hdr(skb); 394 if (is_saddr) { 395 *port = sh->source; 396 from = &ipv6_hdr(skb)->saddr; 397 } else { 398 *port = sh->dest; 399 from = &ipv6_hdr(skb)->daddr; 400 } 401 ipv6_addr_copy(&addr->v6.sin6_addr, from); 402} 403 404/* Initialize an sctp_addr from a socket. */ 405static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) 406{ 407 addr->v6.sin6_family = AF_INET6; 408 addr->v6.sin6_port = 0; 409 ipv6_addr_copy(&addr->v6.sin6_addr, &inet6_sk(sk)->rcv_saddr); 410} 411 412/* Initialize sk->sk_rcv_saddr from sctp_addr. */ 413static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 414{ 415 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 416 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; 417 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; 418 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); 419 inet6_sk(sk)->rcv_saddr.s6_addr32[3] = 420 addr->v4.sin_addr.s_addr; 421 } else { 422 ipv6_addr_copy(&inet6_sk(sk)->rcv_saddr, &addr->v6.sin6_addr); 423 } 424} 425 426/* Initialize sk->sk_daddr from sctp_addr. */ 427static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 428{ 429 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { 430 inet6_sk(sk)->daddr.s6_addr32[0] = 0; 431 inet6_sk(sk)->daddr.s6_addr32[1] = 0; 432 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); 433 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 434 } else { 435 ipv6_addr_copy(&inet6_sk(sk)->daddr, &addr->v6.sin6_addr); 436 } 437} 438 439/* Initialize a sctp_addr from an address parameter. */ 440static void sctp_v6_from_addr_param(union sctp_addr *addr, 441 union sctp_addr_param *param, 442 __be16 port, int iif) 443{ 444 addr->v6.sin6_family = AF_INET6; 445 addr->v6.sin6_port = port; 446 addr->v6.sin6_flowinfo = 0; /* BUG */ 447 ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); 448 addr->v6.sin6_scope_id = iif; 449} 450 451/* Initialize an address parameter from a sctp_addr and return the length 452 * of the address parameter. 453 */ 454static int sctp_v6_to_addr_param(const union sctp_addr *addr, 455 union sctp_addr_param *param) 456{ 457 int length = sizeof(sctp_ipv6addr_param_t); 458 459 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; 460 param->v6.param_hdr.length = htons(length); 461 ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); 462 463 return length; 464} 465 466/* Initialize a sctp_addr from a dst_entry. */ 467static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, 468 __be16 port) 469{ 470 struct rt6_info *rt = (struct rt6_info *)dst; 471 addr->sa.sa_family = AF_INET6; 472 addr->v6.sin6_port = port; 473 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); 474} 475 476/* Compare addresses exactly. 477 * v4-mapped-v6 is also in consideration. 478 */ 479static int sctp_v6_cmp_addr(const union sctp_addr *addr1, 480 const union sctp_addr *addr2) 481{ 482 if (addr1->sa.sa_family != addr2->sa.sa_family) { 483 if (addr1->sa.sa_family == AF_INET && 484 addr2->sa.sa_family == AF_INET6 && 485 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) { 486 if (addr2->v6.sin6_port == addr1->v4.sin_port && 487 addr2->v6.sin6_addr.s6_addr32[3] == 488 addr1->v4.sin_addr.s_addr) 489 return 1; 490 } 491 if (addr2->sa.sa_family == AF_INET && 492 addr1->sa.sa_family == AF_INET6 && 493 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) { 494 if (addr1->v6.sin6_port == addr2->v4.sin_port && 495 addr1->v6.sin6_addr.s6_addr32[3] == 496 addr2->v4.sin_addr.s_addr) 497 return 1; 498 } 499 return 0; 500 } 501 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) 502 return 0; 503 /* If this is a linklocal address, compare the scope_id. */ 504 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { 505 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && 506 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { 507 return 0; 508 } 509 } 510 511 return 1; 512} 513 514/* Initialize addr struct to INADDR_ANY. */ 515static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) 516{ 517 memset(addr, 0x00, sizeof(union sctp_addr)); 518 addr->v6.sin6_family = AF_INET6; 519 addr->v6.sin6_port = port; 520} 521 522/* Is this a wildcard address? */ 523static int sctp_v6_is_any(const union sctp_addr *addr) 524{ 525 return ipv6_addr_any(&addr->v6.sin6_addr); 526} 527 528/* Should this be available for binding? */ 529static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) 530{ 531 int type; 532 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; 533 534 type = ipv6_addr_type(in6); 535 if (IPV6_ADDR_ANY == type) 536 return 1; 537 if (type == IPV6_ADDR_MAPPED) { 538 if (sp && !sp->v4mapped) 539 return 0; 540 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 541 return 0; 542 sctp_v6_map_v4(addr); 543 return sctp_get_af_specific(AF_INET)->available(addr, sp); 544 } 545 if (!(type & IPV6_ADDR_UNICAST)) 546 return 0; 547 548 return ipv6_chk_addr(&init_net, in6, NULL, 0); 549} 550 551/* This function checks if the address is a valid address to be used for 552 * SCTP. 553 * 554 * Output: 555 * Return 0 - If the address is a non-unicast or an illegal address. 556 * Return 1 - If the address is a unicast. 557 */ 558static int sctp_v6_addr_valid(union sctp_addr *addr, 559 struct sctp_sock *sp, 560 const struct sk_buff *skb) 561{ 562 int ret = ipv6_addr_type(&addr->v6.sin6_addr); 563 564 /* Support v4-mapped-v6 address. */ 565 if (ret == IPV6_ADDR_MAPPED) { 566 /* Note: This routine is used in input, so v4-mapped-v6 567 * are disallowed here when there is no sctp_sock. 568 */ 569 if (!sp || !sp->v4mapped) 570 return 0; 571 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 572 return 0; 573 sctp_v6_map_v4(addr); 574 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); 575 } 576 577 /* Is this a non-unicast address */ 578 if (!(ret & IPV6_ADDR_UNICAST)) 579 return 0; 580 581 return 1; 582} 583 584/* What is the scope of 'addr'? */ 585static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) 586{ 587 int v6scope; 588 sctp_scope_t retval; 589 590 /* The IPv6 scope is really a set of bit fields. 591 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. 592 */ 593 594 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); 595 switch (v6scope) { 596 case IFA_HOST: 597 retval = SCTP_SCOPE_LOOPBACK; 598 break; 599 case IFA_LINK: 600 retval = SCTP_SCOPE_LINK; 601 break; 602 case IFA_SITE: 603 retval = SCTP_SCOPE_PRIVATE; 604 break; 605 default: 606 retval = SCTP_SCOPE_GLOBAL; 607 break; 608 } 609 610 return retval; 611} 612 613/* Create and initialize a new sk for the socket to be returned by accept(). */ 614static struct sock *sctp_v6_create_accept_sk(struct sock *sk, 615 struct sctp_association *asoc) 616{ 617 struct sock *newsk; 618 struct ipv6_pinfo *newnp, *np = inet6_sk(sk); 619 struct sctp6_sock *newsctp6sk; 620 621 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot); 622 if (!newsk) 623 goto out; 624 625 sock_init_data(NULL, newsk); 626 627 sctp_copy_sock(newsk, sk, asoc); 628 sock_reset_flag(sk, SOCK_ZAPPED); 629 630 newsctp6sk = (struct sctp6_sock *)newsk; 631 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; 632 633 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped; 634 635 newnp = inet6_sk(newsk); 636 637 memcpy(newnp, np, sizeof(struct ipv6_pinfo)); 638 639 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() 640 * and getpeername(). 641 */ 642 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); 643 644 sk_refcnt_debug_inc(newsk); 645 646 if (newsk->sk_prot->init(newsk)) { 647 sk_common_release(newsk); 648 newsk = NULL; 649 } 650 651out: 652 return newsk; 653} 654 655/* Map v4 address to mapped v6 address */ 656static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 657{ 658 if (sp->v4mapped && AF_INET == addr->sa.sa_family) 659 sctp_v4_map_v6(addr); 660} 661 662/* Where did this skb come from? */ 663static int sctp_v6_skb_iif(const struct sk_buff *skb) 664{ 665 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; 666 return opt->iif; 667} 668 669/* Was this packet marked by Explicit Congestion Notification? */ 670static int sctp_v6_is_ce(const struct sk_buff *skb) 671{ 672 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20); 673} 674 675/* Dump the v6 addr to the seq file. */ 676static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 677{ 678 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr); 679} 680 681static void sctp_v6_ecn_capable(struct sock *sk) 682{ 683 inet6_sk(sk)->tclass |= INET_ECN_ECT_0; 684} 685 686/* Initialize a PF_INET6 socket msg_name. */ 687static void sctp_inet6_msgname(char *msgname, int *addr_len) 688{ 689 struct sockaddr_in6 *sin6; 690 691 sin6 = (struct sockaddr_in6 *)msgname; 692 sin6->sin6_family = AF_INET6; 693 sin6->sin6_flowinfo = 0; 694 sin6->sin6_scope_id = 0; 695 *addr_len = sizeof(struct sockaddr_in6); 696} 697 698/* Initialize a PF_INET msgname from a ulpevent. */ 699static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, 700 char *msgname, int *addrlen) 701{ 702 struct sockaddr_in6 *sin6, *sin6from; 703 704 if (msgname) { 705 union sctp_addr *addr; 706 struct sctp_association *asoc; 707 708 asoc = event->asoc; 709 sctp_inet6_msgname(msgname, addrlen); 710 sin6 = (struct sockaddr_in6 *)msgname; 711 sin6->sin6_port = htons(asoc->peer.port); 712 addr = &asoc->peer.primary_addr; 713 714 /* Note: If we go to a common v6 format, this code 715 * will change. 716 */ 717 718 /* Map ipv4 address into v4-mapped-on-v6 address. */ 719 if (sctp_sk(asoc->base.sk)->v4mapped && 720 AF_INET == addr->sa.sa_family) { 721 sctp_v4_map_v6((union sctp_addr *)sin6); 722 sin6->sin6_addr.s6_addr32[3] = 723 addr->v4.sin_addr.s_addr; 724 return; 725 } 726 727 sin6from = &asoc->peer.primary_addr.v6; 728 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); 729 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 730 sin6->sin6_scope_id = sin6from->sin6_scope_id; 731 } 732} 733 734/* Initialize a msg_name from an inbound skb. */ 735static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 736 int *addr_len) 737{ 738 struct sctphdr *sh; 739 struct sockaddr_in6 *sin6; 740 741 if (msgname) { 742 sctp_inet6_msgname(msgname, addr_len); 743 sin6 = (struct sockaddr_in6 *)msgname; 744 sh = sctp_hdr(skb); 745 sin6->sin6_port = sh->source; 746 747 /* Map ipv4 address into v4-mapped-on-v6 address. */ 748 if (sctp_sk(skb->sk)->v4mapped && 749 ip_hdr(skb)->version == 4) { 750 sctp_v4_map_v6((union sctp_addr *)sin6); 751 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr; 752 return; 753 } 754 755 /* Otherwise, just copy the v6 address. */ 756 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr); 757 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { 758 struct sctp_ulpevent *ev = sctp_skb2event(skb); 759 sin6->sin6_scope_id = ev->iif; 760 } 761 } 762} 763 764/* Do we support this AF? */ 765static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) 766{ 767 switch (family) { 768 case AF_INET6: 769 return 1; 770 /* v4-mapped-v6 addresses */ 771 case AF_INET: 772 if (!__ipv6_only_sock(sctp_opt2sk(sp))) 773 return 1; 774 default: 775 return 0; 776 } 777} 778 779/* Address matching with wildcards allowed. This extra level 780 * of indirection lets us choose whether a PF_INET6 should 781 * disallow any v4 addresses if we so choose. 782 */ 783static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, 784 const union sctp_addr *addr2, 785 struct sctp_sock *opt) 786{ 787 struct sctp_af *af1, *af2; 788 struct sock *sk = sctp_opt2sk(opt); 789 790 af1 = sctp_get_af_specific(addr1->sa.sa_family); 791 af2 = sctp_get_af_specific(addr2->sa.sa_family); 792 793 if (!af1 || !af2) 794 return 0; 795 796 /* If the socket is IPv6 only, v4 addrs will not match */ 797 if (__ipv6_only_sock(sk) && af1 != af2) 798 return 0; 799 800 /* Today, wildcard AF_INET/AF_INET6. */ 801 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2)) 802 return 1; 803 804 if (addr1->sa.sa_family != addr2->sa.sa_family) 805 return 0; 806 807 return af1->cmp_addr(addr1, addr2); 808} 809 810/* Verify that the provided sockaddr looks bindable. Common verification, 811 * has already been taken care of. 812 */ 813static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 814{ 815 struct sctp_af *af; 816 817 /* ASSERT: address family has already been verified. */ 818 if (addr->sa.sa_family != AF_INET6) 819 af = sctp_get_af_specific(addr->sa.sa_family); 820 else { 821 int type = ipv6_addr_type(&addr->v6.sin6_addr); 822 struct net_device *dev; 823 824 if (type & IPV6_ADDR_LINKLOCAL) { 825 if (!addr->v6.sin6_scope_id) 826 return 0; 827 rcu_read_lock(); 828 dev = dev_get_by_index_rcu(&init_net, 829 addr->v6.sin6_scope_id); 830 if (!dev || 831 !ipv6_chk_addr(&init_net, &addr->v6.sin6_addr, 832 dev, 0)) { 833 rcu_read_unlock(); 834 return 0; 835 } 836 rcu_read_unlock(); 837 } else if (type == IPV6_ADDR_MAPPED) { 838 if (!opt->v4mapped) 839 return 0; 840 } 841 842 af = opt->pf->af; 843 } 844 return af->available(addr, opt); 845} 846 847/* Verify that the provided sockaddr looks sendable. Common verification, 848 * has already been taken care of. 849 */ 850static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 851{ 852 struct sctp_af *af = NULL; 853 854 /* ASSERT: address family has already been verified. */ 855 if (addr->sa.sa_family != AF_INET6) 856 af = sctp_get_af_specific(addr->sa.sa_family); 857 else { 858 int type = ipv6_addr_type(&addr->v6.sin6_addr); 859 struct net_device *dev; 860 861 if (type & IPV6_ADDR_LINKLOCAL) { 862 if (!addr->v6.sin6_scope_id) 863 return 0; 864 rcu_read_lock(); 865 dev = dev_get_by_index_rcu(&init_net, 866 addr->v6.sin6_scope_id); 867 rcu_read_unlock(); 868 if (!dev) 869 return 0; 870 } 871 af = opt->pf->af; 872 } 873 874 return af != NULL; 875} 876 877/* Fill in Supported Address Type information for INIT and INIT-ACK 878 * chunks. Note: In the future, we may want to look at sock options 879 * to determine whether a PF_INET6 socket really wants to have IPV4 880 * addresses. 881 * Returns number of addresses supported. 882 */ 883static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, 884 __be16 *types) 885{ 886 types[0] = SCTP_PARAM_IPV6_ADDRESS; 887 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) { 888 types[1] = SCTP_PARAM_IPV4_ADDRESS; 889 return 2; 890 } 891 return 1; 892} 893 894static const struct proto_ops inet6_seqpacket_ops = { 895 .family = PF_INET6, 896 .owner = THIS_MODULE, 897 .release = inet6_release, 898 .bind = inet6_bind, 899 .connect = inet_dgram_connect, 900 .socketpair = sock_no_socketpair, 901 .accept = inet_accept, 902 .getname = inet6_getname, 903 .poll = sctp_poll, 904 .ioctl = inet6_ioctl, 905 .listen = sctp_inet_listen, 906 .shutdown = inet_shutdown, 907 .setsockopt = sock_common_setsockopt, 908 .getsockopt = sock_common_getsockopt, 909 .sendmsg = inet_sendmsg, 910 .recvmsg = sock_common_recvmsg, 911 .mmap = sock_no_mmap, 912#ifdef CONFIG_COMPAT 913 .compat_setsockopt = compat_sock_common_setsockopt, 914 .compat_getsockopt = compat_sock_common_getsockopt, 915#endif 916}; 917 918static struct inet_protosw sctpv6_seqpacket_protosw = { 919 .type = SOCK_SEQPACKET, 920 .protocol = IPPROTO_SCTP, 921 .prot = &sctpv6_prot, 922 .ops = &inet6_seqpacket_ops, 923 .no_check = 0, 924 .flags = SCTP_PROTOSW_FLAG 925}; 926static struct inet_protosw sctpv6_stream_protosw = { 927 .type = SOCK_STREAM, 928 .protocol = IPPROTO_SCTP, 929 .prot = &sctpv6_prot, 930 .ops = &inet6_seqpacket_ops, 931 .no_check = 0, 932 .flags = SCTP_PROTOSW_FLAG, 933}; 934 935static int sctp6_rcv(struct sk_buff *skb) 936{ 937 return sctp_rcv(skb) ? -1 : 0; 938} 939 940static const struct inet6_protocol sctpv6_protocol = { 941 .handler = sctp6_rcv, 942 .err_handler = sctp_v6_err, 943 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, 944}; 945 946static struct sctp_af sctp_af_inet6 = { 947 .sa_family = AF_INET6, 948 .sctp_xmit = sctp_v6_xmit, 949 .setsockopt = ipv6_setsockopt, 950 .getsockopt = ipv6_getsockopt, 951 .get_dst = sctp_v6_get_dst, 952 .get_saddr = sctp_v6_get_saddr, 953 .copy_addrlist = sctp_v6_copy_addrlist, 954 .from_skb = sctp_v6_from_skb, 955 .from_sk = sctp_v6_from_sk, 956 .to_sk_saddr = sctp_v6_to_sk_saddr, 957 .to_sk_daddr = sctp_v6_to_sk_daddr, 958 .from_addr_param = sctp_v6_from_addr_param, 959 .to_addr_param = sctp_v6_to_addr_param, 960 .dst_saddr = sctp_v6_dst_saddr, 961 .cmp_addr = sctp_v6_cmp_addr, 962 .scope = sctp_v6_scope, 963 .addr_valid = sctp_v6_addr_valid, 964 .inaddr_any = sctp_v6_inaddr_any, 965 .is_any = sctp_v6_is_any, 966 .available = sctp_v6_available, 967 .skb_iif = sctp_v6_skb_iif, 968 .is_ce = sctp_v6_is_ce, 969 .seq_dump_addr = sctp_v6_seq_dump_addr, 970 .ecn_capable = sctp_v6_ecn_capable, 971 .net_header_len = sizeof(struct ipv6hdr), 972 .sockaddr_len = sizeof(struct sockaddr_in6), 973#ifdef CONFIG_COMPAT 974 .compat_setsockopt = compat_ipv6_setsockopt, 975 .compat_getsockopt = compat_ipv6_getsockopt, 976#endif 977}; 978 979static struct sctp_pf sctp_pf_inet6 = { 980 .event_msgname = sctp_inet6_event_msgname, 981 .skb_msgname = sctp_inet6_skb_msgname, 982 .af_supported = sctp_inet6_af_supported, 983 .cmp_addr = sctp_inet6_cmp_addr, 984 .bind_verify = sctp_inet6_bind_verify, 985 .send_verify = sctp_inet6_send_verify, 986 .supported_addrs = sctp_inet6_supported_addrs, 987 .create_accept_sk = sctp_v6_create_accept_sk, 988 .addr_v4map = sctp_v6_addr_v4map, 989 .af = &sctp_af_inet6, 990}; 991 992/* Initialize IPv6 support and register with socket layer. */ 993void sctp_v6_pf_init(void) 994{ 995 /* Register the SCTP specific PF_INET6 functions. */ 996 sctp_register_pf(&sctp_pf_inet6, PF_INET6); 997 998 /* Register the SCTP specific AF_INET6 functions. */ 999 sctp_register_af(&sctp_af_inet6); 1000} 1001 1002void sctp_v6_pf_exit(void) 1003{ 1004 list_del(&sctp_af_inet6.list); 1005} 1006 1007/* Initialize IPv6 support and register with socket layer. */ 1008int sctp_v6_protosw_init(void) 1009{ 1010 int rc; 1011 1012 rc = proto_register(&sctpv6_prot, 1); 1013 if (rc) 1014 return rc; 1015 1016 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ 1017 inet6_register_protosw(&sctpv6_seqpacket_protosw); 1018 inet6_register_protosw(&sctpv6_stream_protosw); 1019 1020 return 0; 1021} 1022 1023void sctp_v6_protosw_exit(void) 1024{ 1025 inet6_unregister_protosw(&sctpv6_seqpacket_protosw); 1026 inet6_unregister_protosw(&sctpv6_stream_protosw); 1027 proto_unregister(&sctpv6_prot); 1028} 1029 1030 1031/* Register with inet6 layer. */ 1032int sctp_v6_add_protocol(void) 1033{ 1034 /* Register notifier for inet6 address additions/deletions. */ 1035 register_inet6addr_notifier(&sctp_inet6addr_notifier); 1036 1037 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) 1038 return -EAGAIN; 1039 1040 return 0; 1041} 1042 1043/* Unregister with inet6 layer. */ 1044void sctp_v6_del_protocol(void) 1045{ 1046 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); 1047 unregister_inet6addr_notifier(&sctp_inet6addr_notifier); 1048} 1049