1 /* 2 * PF_INET6 socket protocol family 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Adapted from linux/net/ipv4/af_inet.c 9 * 10 * $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $ 11 * 12 * Fixes: 13 * piggy, Karl Knutson : Socket protocol table 14 * Hideaki YOSHIFUJI : sin6_scope_id support 15 * Arnaldo Melo : check proc_net_create return, cleanups 16 * 17 * This program is free software; you can redistribute it and/or 18 * modify it under the terms of the GNU General Public License 19 * as published by the Free Software Foundation; either version 20 * 2 of the License, or (at your option) any later version. 21 */ 22 23 24 #include <linux/module.h> 25 #include <linux/capability.h> 26 #include <linux/errno.h> 27 #include <linux/types.h> 28 #include <linux/socket.h> 29 #include <linux/in.h> 30 #include <linux/kernel.h> 31 #include <linux/timer.h> 32 #include <linux/string.h> 33 #include <linux/sockios.h> 34 #include <linux/net.h> 35 #include <linux/fcntl.h> 36 #include <linux/mm.h> 37 #include <linux/interrupt.h> 38 #include <linux/proc_fs.h> 39 #include <linux/stat.h> 40 #include <linux/init.h> 41 42 #include <linux/inet.h> 43 #include <linux/netdevice.h> 44 #include <linux/icmpv6.h> 45 #include <linux/netfilter_ipv6.h> 46 47 #include <net/ip.h> 48 #include <net/ipv6.h> 49 #include <net/udp.h> 50 #include <net/udplite.h> 51 #include <net/tcp.h> 52 #include <net/ipip.h> 53 #include <net/protocol.h> 54 #include <net/inet_common.h> 55 #include <net/transp_v6.h> 56 #include <net/ip6_route.h> 57 #include <net/addrconf.h> 58 #ifdef CONFIG_IPV6_TUNNEL 59 #include <net/ip6_tunnel.h> 60 #endif 61 62 #include <asm/uaccess.h> 63 #include <asm/system.h> 64 65 MODULE_AUTHOR("Cast of dozens"); 66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 67 MODULE_LICENSE("GPL"); 68 69 int sysctl_ipv6_bindv6only __read_mostly; 70 71 /* The inetsw table contains everything that inet_create needs to 72 * build a new socket. 73 */ 74 static struct list_head inetsw6[SOCK_MAX]; 75 static DEFINE_SPINLOCK(inetsw6_lock); 76 77 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 78 { 79 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 80 81 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 82 } 83 84 static int inet6_create(struct net *net, struct socket *sock, int protocol) 85 { 86 struct inet_sock *inet; 87 struct ipv6_pinfo *np; 88 struct sock *sk; 89 struct list_head *p; 90 struct inet_protosw *answer; 91 struct proto *answer_prot; 92 unsigned char answer_flags; 93 char answer_no_check; 94 int try_loading_module = 0; 95 int err; 96 97 if (net != &init_net) 98 return -EAFNOSUPPORT; 99 100 if (sock->type != SOCK_RAW && 101 sock->type != SOCK_DGRAM && 102 !inet_ehash_secret) 103 build_ehash_secret(); 104 105 /* Look for the requested type/protocol pair. */ 106 answer = NULL; 107 lookup_protocol: 108 err = -ESOCKTNOSUPPORT; 109 rcu_read_lock(); 110 list_for_each_rcu(p, &inetsw6[sock->type]) { 111 answer = list_entry(p, struct inet_protosw, list); 112 113 /* Check the non-wild match. */ 114 if (protocol == answer->protocol) { 115 if (protocol != IPPROTO_IP) 116 break; 117 } else { 118 /* Check for the two wild cases. */ 119 if (IPPROTO_IP == protocol) { 120 protocol = answer->protocol; 121 break; 122 } 123 if (IPPROTO_IP == answer->protocol) 124 break; 125 } 126 err = -EPROTONOSUPPORT; 127 answer = NULL; 128 } 129 130 if (!answer) { 131 if (try_loading_module < 2) { 132 rcu_read_unlock(); 133 /* 134 * Be more specific, e.g. net-pf-10-proto-132-type-1 135 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 136 */ 137 if (++try_loading_module == 1) 138 request_module("net-pf-%d-proto-%d-type-%d", 139 PF_INET6, protocol, sock->type); 140 /* 141 * Fall back to generic, e.g. net-pf-10-proto-132 142 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 143 */ 144 else 145 request_module("net-pf-%d-proto-%d", 146 PF_INET6, protocol); 147 goto lookup_protocol; 148 } else 149 goto out_rcu_unlock; 150 } 151 152 err = -EPERM; 153 if (answer->capability > 0 && !capable(answer->capability)) 154 goto out_rcu_unlock; 155 156 sock->ops = answer->ops; 157 answer_prot = answer->prot; 158 answer_no_check = answer->no_check; 159 answer_flags = answer->flags; 160 rcu_read_unlock(); 161 162 BUG_TRAP(answer_prot->slab != NULL); 163 164 err = -ENOBUFS; 165 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, 1); 166 if (sk == NULL) 167 goto out; 168 169 sock_init_data(sock, sk); 170 171 err = 0; 172 sk->sk_no_check = answer_no_check; 173 if (INET_PROTOSW_REUSE & answer_flags) 174 sk->sk_reuse = 1; 175 176 inet = inet_sk(sk); 177 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 178 179 if (SOCK_RAW == sock->type) { 180 inet->num = protocol; 181 if (IPPROTO_RAW == protocol) 182 inet->hdrincl = 1; 183 } 184 185 sk->sk_destruct = inet_sock_destruct; 186 sk->sk_family = PF_INET6; 187 sk->sk_protocol = protocol; 188 189 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 190 191 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 192 np->hop_limit = -1; 193 np->mcast_hops = -1; 194 np->mc_loop = 1; 195 np->pmtudisc = IPV6_PMTUDISC_WANT; 196 np->ipv6only = sysctl_ipv6_bindv6only; 197 198 /* Init the ipv4 part of the socket since we can have sockets 199 * using v6 API for ipv4. 200 */ 201 inet->uc_ttl = -1; 202 203 inet->mc_loop = 1; 204 inet->mc_ttl = 1; 205 inet->mc_index = 0; 206 inet->mc_list = NULL; 207 208 if (ipv4_config.no_pmtu_disc) 209 inet->pmtudisc = IP_PMTUDISC_DONT; 210 else 211 inet->pmtudisc = IP_PMTUDISC_WANT; 212 /* 213 * Increment only the relevant sk_prot->socks debug field, this changes 214 * the previous behaviour of incrementing both the equivalent to 215 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 216 * 217 * This allows better debug granularity as we'll know exactly how many 218 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 219 * transport protocol socks. -acme 220 */ 221 sk_refcnt_debug_inc(sk); 222 223 if (inet->num) { 224 /* It assumes that any protocol which allows 225 * the user to assign a number at socket 226 * creation time automatically shares. 227 */ 228 inet->sport = htons(inet->num); 229 sk->sk_prot->hash(sk); 230 } 231 if (sk->sk_prot->init) { 232 err = sk->sk_prot->init(sk); 233 if (err) { 234 sk_common_release(sk); 235 goto out; 236 } 237 } 238 out: 239 return err; 240 out_rcu_unlock: 241 rcu_read_unlock(); 242 goto out; 243 } 244 245 246 /* bind for INET6 API */ 247 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 248 { 249 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 250 struct sock *sk = sock->sk; 251 struct inet_sock *inet = inet_sk(sk); 252 struct ipv6_pinfo *np = inet6_sk(sk); 253 __be32 v4addr = 0; 254 unsigned short snum; 255 int addr_type = 0; 256 int err = 0; 257 258 /* If the socket has its own bind function then use it. */ 259 if (sk->sk_prot->bind) 260 return sk->sk_prot->bind(sk, uaddr, addr_len); 261 262 if (addr_len < SIN6_LEN_RFC2133) 263 return -EINVAL; 264 addr_type = ipv6_addr_type(&addr->sin6_addr); 265 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 266 return -EINVAL; 267 268 snum = ntohs(addr->sin6_port); 269 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 270 return -EACCES; 271 272 lock_sock(sk); 273 274 /* Check these errors (active socket, double bind). */ 275 if (sk->sk_state != TCP_CLOSE || inet->num) { 276 err = -EINVAL; 277 goto out; 278 } 279 280 /* Check if the address belongs to the host. */ 281 if (addr_type == IPV6_ADDR_MAPPED) { 282 v4addr = addr->sin6_addr.s6_addr32[3]; 283 if (inet_addr_type(v4addr) != RTN_LOCAL) { 284 err = -EADDRNOTAVAIL; 285 goto out; 286 } 287 } else { 288 if (addr_type != IPV6_ADDR_ANY) { 289 struct net_device *dev = NULL; 290 291 if (addr_type & IPV6_ADDR_LINKLOCAL) { 292 if (addr_len >= sizeof(struct sockaddr_in6) && 293 addr->sin6_scope_id) { 294 /* Override any existing binding, if another one 295 * is supplied by user. 296 */ 297 sk->sk_bound_dev_if = addr->sin6_scope_id; 298 } 299 300 /* Binding to link-local address requires an interface */ 301 if (!sk->sk_bound_dev_if) { 302 err = -EINVAL; 303 goto out; 304 } 305 dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if); 306 if (!dev) { 307 err = -ENODEV; 308 goto out; 309 } 310 } 311 312 /* ipv4 addr of the socket is invalid. Only the 313 * unspecified and mapped address have a v4 equivalent. 314 */ 315 v4addr = LOOPBACK4_IPV6; 316 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 317 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { 318 if (dev) 319 dev_put(dev); 320 err = -EADDRNOTAVAIL; 321 goto out; 322 } 323 } 324 if (dev) 325 dev_put(dev); 326 } 327 } 328 329 inet->rcv_saddr = v4addr; 330 inet->saddr = v4addr; 331 332 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 333 334 if (!(addr_type & IPV6_ADDR_MULTICAST)) 335 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 336 337 /* Make sure we are allowed to bind here. */ 338 if (sk->sk_prot->get_port(sk, snum)) { 339 inet_reset_saddr(sk); 340 err = -EADDRINUSE; 341 goto out; 342 } 343 344 if (addr_type != IPV6_ADDR_ANY) 345 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 346 if (snum) 347 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 348 inet->sport = htons(inet->num); 349 inet->dport = 0; 350 inet->daddr = 0; 351 out: 352 release_sock(sk); 353 return err; 354 } 355 356 EXPORT_SYMBOL(inet6_bind); 357 358 int inet6_release(struct socket *sock) 359 { 360 struct sock *sk = sock->sk; 361 362 if (sk == NULL) 363 return -EINVAL; 364 365 /* Free mc lists */ 366 ipv6_sock_mc_close(sk); 367 368 /* Free ac lists */ 369 ipv6_sock_ac_close(sk); 370 371 return inet_release(sock); 372 } 373 374 EXPORT_SYMBOL(inet6_release); 375 376 int inet6_destroy_sock(struct sock *sk) 377 { 378 struct ipv6_pinfo *np = inet6_sk(sk); 379 struct sk_buff *skb; 380 struct ipv6_txoptions *opt; 381 382 /* Release rx options */ 383 384 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 385 kfree_skb(skb); 386 387 /* Free flowlabels */ 388 fl6_free_socklist(sk); 389 390 /* Free tx options */ 391 392 if ((opt = xchg(&np->opt, NULL)) != NULL) 393 sock_kfree_s(sk, opt, opt->tot_len); 394 395 return 0; 396 } 397 398 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 399 400 /* 401 * This does both peername and sockname. 402 */ 403 404 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 405 int *uaddr_len, int peer) 406 { 407 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 408 struct sock *sk = sock->sk; 409 struct inet_sock *inet = inet_sk(sk); 410 struct ipv6_pinfo *np = inet6_sk(sk); 411 412 sin->sin6_family = AF_INET6; 413 sin->sin6_flowinfo = 0; 414 sin->sin6_scope_id = 0; 415 if (peer) { 416 if (!inet->dport) 417 return -ENOTCONN; 418 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 419 peer == 1) 420 return -ENOTCONN; 421 sin->sin6_port = inet->dport; 422 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 423 if (np->sndflow) 424 sin->sin6_flowinfo = np->flow_label; 425 } else { 426 if (ipv6_addr_any(&np->rcv_saddr)) 427 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 428 else 429 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 430 431 sin->sin6_port = inet->sport; 432 } 433 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 434 sin->sin6_scope_id = sk->sk_bound_dev_if; 435 *uaddr_len = sizeof(*sin); 436 return(0); 437 } 438 439 EXPORT_SYMBOL(inet6_getname); 440 441 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 442 { 443 struct sock *sk = sock->sk; 444 445 switch(cmd) 446 { 447 case SIOCGSTAMP: 448 return sock_get_timestamp(sk, (struct timeval __user *)arg); 449 450 case SIOCGSTAMPNS: 451 return sock_get_timestampns(sk, (struct timespec __user *)arg); 452 453 case SIOCADDRT: 454 case SIOCDELRT: 455 456 return(ipv6_route_ioctl(cmd,(void __user *)arg)); 457 458 case SIOCSIFADDR: 459 return addrconf_add_ifaddr((void __user *) arg); 460 case SIOCDIFADDR: 461 return addrconf_del_ifaddr((void __user *) arg); 462 case SIOCSIFDSTADDR: 463 return addrconf_set_dstaddr((void __user *) arg); 464 default: 465 if (!sk->sk_prot->ioctl) 466 return -ENOIOCTLCMD; 467 return sk->sk_prot->ioctl(sk, cmd, arg); 468 } 469 /*NOTREACHED*/ 470 return(0); 471 } 472 473 EXPORT_SYMBOL(inet6_ioctl); 474 475 const struct proto_ops inet6_stream_ops = { 476 .family = PF_INET6, 477 .owner = THIS_MODULE, 478 .release = inet6_release, 479 .bind = inet6_bind, 480 .connect = inet_stream_connect, /* ok */ 481 .socketpair = sock_no_socketpair, /* a do nothing */ 482 .accept = inet_accept, /* ok */ 483 .getname = inet6_getname, 484 .poll = tcp_poll, /* ok */ 485 .ioctl = inet6_ioctl, /* must change */ 486 .listen = inet_listen, /* ok */ 487 .shutdown = inet_shutdown, /* ok */ 488 .setsockopt = sock_common_setsockopt, /* ok */ 489 .getsockopt = sock_common_getsockopt, /* ok */ 490 .sendmsg = tcp_sendmsg, /* ok */ 491 .recvmsg = sock_common_recvmsg, /* ok */ 492 .mmap = sock_no_mmap, 493 .sendpage = tcp_sendpage, 494 #ifdef CONFIG_COMPAT 495 .compat_setsockopt = compat_sock_common_setsockopt, 496 .compat_getsockopt = compat_sock_common_getsockopt, 497 #endif 498 }; 499 500 const struct proto_ops inet6_dgram_ops = { 501 .family = PF_INET6, 502 .owner = THIS_MODULE, 503 .release = inet6_release, 504 .bind = inet6_bind, 505 .connect = inet_dgram_connect, /* ok */ 506 .socketpair = sock_no_socketpair, /* a do nothing */ 507 .accept = sock_no_accept, /* a do nothing */ 508 .getname = inet6_getname, 509 .poll = udp_poll, /* ok */ 510 .ioctl = inet6_ioctl, /* must change */ 511 .listen = sock_no_listen, /* ok */ 512 .shutdown = inet_shutdown, /* ok */ 513 .setsockopt = sock_common_setsockopt, /* ok */ 514 .getsockopt = sock_common_getsockopt, /* ok */ 515 .sendmsg = inet_sendmsg, /* ok */ 516 .recvmsg = sock_common_recvmsg, /* ok */ 517 .mmap = sock_no_mmap, 518 .sendpage = sock_no_sendpage, 519 #ifdef CONFIG_COMPAT 520 .compat_setsockopt = compat_sock_common_setsockopt, 521 .compat_getsockopt = compat_sock_common_getsockopt, 522 #endif 523 }; 524 525 static struct net_proto_family inet6_family_ops = { 526 .family = PF_INET6, 527 .create = inet6_create, 528 .owner = THIS_MODULE, 529 }; 530 531 /* Same as inet6_dgram_ops, sans udp_poll. */ 532 static const struct proto_ops inet6_sockraw_ops = { 533 .family = PF_INET6, 534 .owner = THIS_MODULE, 535 .release = inet6_release, 536 .bind = inet6_bind, 537 .connect = inet_dgram_connect, /* ok */ 538 .socketpair = sock_no_socketpair, /* a do nothing */ 539 .accept = sock_no_accept, /* a do nothing */ 540 .getname = inet6_getname, 541 .poll = datagram_poll, /* ok */ 542 .ioctl = inet6_ioctl, /* must change */ 543 .listen = sock_no_listen, /* ok */ 544 .shutdown = inet_shutdown, /* ok */ 545 .setsockopt = sock_common_setsockopt, /* ok */ 546 .getsockopt = sock_common_getsockopt, /* ok */ 547 .sendmsg = inet_sendmsg, /* ok */ 548 .recvmsg = sock_common_recvmsg, /* ok */ 549 .mmap = sock_no_mmap, 550 .sendpage = sock_no_sendpage, 551 #ifdef CONFIG_COMPAT 552 .compat_setsockopt = compat_sock_common_setsockopt, 553 .compat_getsockopt = compat_sock_common_getsockopt, 554 #endif 555 }; 556 557 static struct inet_protosw rawv6_protosw = { 558 .type = SOCK_RAW, 559 .protocol = IPPROTO_IP, /* wild card */ 560 .prot = &rawv6_prot, 561 .ops = &inet6_sockraw_ops, 562 .capability = CAP_NET_RAW, 563 .no_check = UDP_CSUM_DEFAULT, 564 .flags = INET_PROTOSW_REUSE, 565 }; 566 567 void 568 inet6_register_protosw(struct inet_protosw *p) 569 { 570 struct list_head *lh; 571 struct inet_protosw *answer; 572 int protocol = p->protocol; 573 struct list_head *last_perm; 574 575 spin_lock_bh(&inetsw6_lock); 576 577 if (p->type >= SOCK_MAX) 578 goto out_illegal; 579 580 /* If we are trying to override a permanent protocol, bail. */ 581 answer = NULL; 582 last_perm = &inetsw6[p->type]; 583 list_for_each(lh, &inetsw6[p->type]) { 584 answer = list_entry(lh, struct inet_protosw, list); 585 586 /* Check only the non-wild match. */ 587 if (INET_PROTOSW_PERMANENT & answer->flags) { 588 if (protocol == answer->protocol) 589 break; 590 last_perm = lh; 591 } 592 593 answer = NULL; 594 } 595 if (answer) 596 goto out_permanent; 597 598 /* Add the new entry after the last permanent entry if any, so that 599 * the new entry does not override a permanent entry when matched with 600 * a wild-card protocol. But it is allowed to override any existing 601 * non-permanent entry. This means that when we remove this entry, the 602 * system automatically returns to the old behavior. 603 */ 604 list_add_rcu(&p->list, last_perm); 605 out: 606 spin_unlock_bh(&inetsw6_lock); 607 return; 608 609 out_permanent: 610 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 611 protocol); 612 goto out; 613 614 out_illegal: 615 printk(KERN_ERR 616 "Ignoring attempt to register invalid socket type %d.\n", 617 p->type); 618 goto out; 619 } 620 621 EXPORT_SYMBOL(inet6_register_protosw); 622 623 void 624 inet6_unregister_protosw(struct inet_protosw *p) 625 { 626 if (INET_PROTOSW_PERMANENT & p->flags) { 627 printk(KERN_ERR 628 "Attempt to unregister permanent protocol %d.\n", 629 p->protocol); 630 } else { 631 spin_lock_bh(&inetsw6_lock); 632 list_del_rcu(&p->list); 633 spin_unlock_bh(&inetsw6_lock); 634 635 synchronize_net(); 636 } 637 } 638 639 EXPORT_SYMBOL(inet6_unregister_protosw); 640 641 int inet6_sk_rebuild_header(struct sock *sk) 642 { 643 int err; 644 struct dst_entry *dst; 645 struct ipv6_pinfo *np = inet6_sk(sk); 646 647 dst = __sk_dst_check(sk, np->dst_cookie); 648 649 if (dst == NULL) { 650 struct inet_sock *inet = inet_sk(sk); 651 struct in6_addr *final_p = NULL, final; 652 struct flowi fl; 653 654 memset(&fl, 0, sizeof(fl)); 655 fl.proto = sk->sk_protocol; 656 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 657 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 658 fl.fl6_flowlabel = np->flow_label; 659 fl.oif = sk->sk_bound_dev_if; 660 fl.fl_ip_dport = inet->dport; 661 fl.fl_ip_sport = inet->sport; 662 security_sk_classify_flow(sk, &fl); 663 664 if (np->opt && np->opt->srcrt) { 665 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 666 ipv6_addr_copy(&final, &fl.fl6_dst); 667 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 668 final_p = &final; 669 } 670 671 err = ip6_dst_lookup(sk, &dst, &fl); 672 if (err) { 673 sk->sk_route_caps = 0; 674 return err; 675 } 676 if (final_p) 677 ipv6_addr_copy(&fl.fl6_dst, final_p); 678 679 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 680 sk->sk_err_soft = -err; 681 return err; 682 } 683 684 __ip6_dst_store(sk, dst, NULL, NULL); 685 } 686 687 return 0; 688 } 689 690 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 691 692 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 693 { 694 struct ipv6_pinfo *np = inet6_sk(sk); 695 struct inet6_skb_parm *opt = IP6CB(skb); 696 697 if (np->rxopt.all) { 698 if ((opt->hop && (np->rxopt.bits.hopopts || 699 np->rxopt.bits.ohopopts)) || 700 ((IPV6_FLOWINFO_MASK & 701 *(__be32 *)skb_network_header(skb)) && 702 np->rxopt.bits.rxflow) || 703 (opt->srcrt && (np->rxopt.bits.srcrt || 704 np->rxopt.bits.osrcrt)) || 705 ((opt->dst1 || opt->dst0) && 706 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 707 return 1; 708 } 709 return 0; 710 } 711 712 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 713 714 static int __init init_ipv6_mibs(void) 715 { 716 if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib), 717 __alignof__(struct ipstats_mib)) < 0) 718 goto err_ip_mib; 719 if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib), 720 __alignof__(struct icmpv6_mib)) < 0) 721 goto err_icmp_mib; 722 if (snmp_mib_init((void **)icmpv6msg_statistics, 723 sizeof (struct icmpv6msg_mib), __alignof__(struct icmpv6_mib)) < 0) 724 goto err_icmpmsg_mib; 725 if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib), 726 __alignof__(struct udp_mib)) < 0) 727 goto err_udp_mib; 728 if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib), 729 __alignof__(struct udp_mib)) < 0) 730 goto err_udplite_mib; 731 return 0; 732 733 err_udplite_mib: 734 snmp_mib_free((void **)udp_stats_in6); 735 err_udp_mib: 736 snmp_mib_free((void **)icmpv6msg_statistics); 737 err_icmpmsg_mib: 738 snmp_mib_free((void **)icmpv6_statistics); 739 err_icmp_mib: 740 snmp_mib_free((void **)ipv6_statistics); 741 err_ip_mib: 742 return -ENOMEM; 743 744 } 745 746 static void cleanup_ipv6_mibs(void) 747 { 748 snmp_mib_free((void **)ipv6_statistics); 749 snmp_mib_free((void **)icmpv6_statistics); 750 snmp_mib_free((void **)icmpv6msg_statistics); 751 snmp_mib_free((void **)udp_stats_in6); 752 snmp_mib_free((void **)udplite_stats_in6); 753 } 754 755 static int __init inet6_init(void) 756 { 757 struct sk_buff *dummy_skb; 758 struct list_head *r; 759 int err; 760 761 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 762 763 #ifdef MODULE 764 #if 0 /* FIXME --RR */ 765 if (!mod_member_present(&__this_module, can_unload)) 766 return -EINVAL; 767 768 __this_module.can_unload = &ipv6_unload; 769 #endif 770 #endif 771 772 err = proto_register(&tcpv6_prot, 1); 773 if (err) 774 goto out; 775 776 err = proto_register(&udpv6_prot, 1); 777 if (err) 778 goto out_unregister_tcp_proto; 779 780 err = proto_register(&udplitev6_prot, 1); 781 if (err) 782 goto out_unregister_udp_proto; 783 784 err = proto_register(&rawv6_prot, 1); 785 if (err) 786 goto out_unregister_udplite_proto; 787 788 789 /* Register the socket-side information for inet6_create. */ 790 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 791 INIT_LIST_HEAD(r); 792 793 /* We MUST register RAW sockets before we create the ICMP6, 794 * IGMP6, or NDISC control sockets. 795 */ 796 inet6_register_protosw(&rawv6_protosw); 797 798 /* Register the family here so that the init calls below will 799 * be able to create sockets. (?? is this dangerous ??) 800 */ 801 err = sock_register(&inet6_family_ops); 802 if (err) 803 goto out_unregister_raw_proto; 804 805 /* Initialise ipv6 mibs */ 806 err = init_ipv6_mibs(); 807 if (err) 808 goto out_unregister_sock; 809 810 /* 811 * ipngwg API draft makes clear that the correct semantics 812 * for TCP and UDP is to consider one TCP and UDP instance 813 * in a host availiable by both INET and INET6 APIs and 814 * able to communicate via both network protocols. 815 */ 816 817 #ifdef CONFIG_SYSCTL 818 ipv6_sysctl_register(); 819 #endif 820 err = icmpv6_init(&inet6_family_ops); 821 if (err) 822 goto icmp_fail; 823 err = ndisc_init(&inet6_family_ops); 824 if (err) 825 goto ndisc_fail; 826 err = igmp6_init(&inet6_family_ops); 827 if (err) 828 goto igmp_fail; 829 err = ipv6_netfilter_init(); 830 if (err) 831 goto netfilter_fail; 832 /* Create /proc/foo6 entries. */ 833 #ifdef CONFIG_PROC_FS 834 err = -ENOMEM; 835 if (raw6_proc_init()) 836 goto proc_raw6_fail; 837 if (tcp6_proc_init()) 838 goto proc_tcp6_fail; 839 if (udp6_proc_init()) 840 goto proc_udp6_fail; 841 if (udplite6_proc_init()) 842 goto proc_udplite6_fail; 843 if (ipv6_misc_proc_init()) 844 goto proc_misc6_fail; 845 846 if (ac6_proc_init()) 847 goto proc_anycast6_fail; 848 if (if6_proc_init()) 849 goto proc_if6_fail; 850 #endif 851 ip6_route_init(); 852 ip6_flowlabel_init(); 853 err = addrconf_init(); 854 if (err) 855 goto addrconf_fail; 856 857 /* Init v6 extension headers. */ 858 ipv6_rthdr_init(); 859 ipv6_frag_init(); 860 ipv6_nodata_init(); 861 ipv6_destopt_init(); 862 863 /* Init v6 transport protocols. */ 864 udpv6_init(); 865 udplitev6_init(); 866 tcpv6_init(); 867 868 ipv6_packet_init(); 869 err = 0; 870 out: 871 return err; 872 873 addrconf_fail: 874 ip6_flowlabel_cleanup(); 875 ip6_route_cleanup(); 876 #ifdef CONFIG_PROC_FS 877 if6_proc_exit(); 878 proc_if6_fail: 879 ac6_proc_exit(); 880 proc_anycast6_fail: 881 ipv6_misc_proc_exit(); 882 proc_misc6_fail: 883 udplite6_proc_exit(); 884 proc_udplite6_fail: 885 udp6_proc_exit(); 886 proc_udp6_fail: 887 tcp6_proc_exit(); 888 proc_tcp6_fail: 889 raw6_proc_exit(); 890 proc_raw6_fail: 891 #endif 892 ipv6_netfilter_fini(); 893 netfilter_fail: 894 igmp6_cleanup(); 895 igmp_fail: 896 ndisc_cleanup(); 897 ndisc_fail: 898 icmpv6_cleanup(); 899 icmp_fail: 900 #ifdef CONFIG_SYSCTL 901 ipv6_sysctl_unregister(); 902 #endif 903 cleanup_ipv6_mibs(); 904 out_unregister_sock: 905 sock_unregister(PF_INET6); 906 out_unregister_raw_proto: 907 proto_unregister(&rawv6_prot); 908 out_unregister_udplite_proto: 909 proto_unregister(&udplitev6_prot); 910 out_unregister_udp_proto: 911 proto_unregister(&udpv6_prot); 912 out_unregister_tcp_proto: 913 proto_unregister(&tcpv6_prot); 914 goto out; 915 } 916 module_init(inet6_init); 917 918 static void __exit inet6_exit(void) 919 { 920 /* First of all disallow new sockets creation. */ 921 sock_unregister(PF_INET6); 922 /* Disallow any further netlink messages */ 923 rtnl_unregister_all(PF_INET6); 924 925 /* Cleanup code parts. */ 926 ipv6_packet_cleanup(); 927 928 addrconf_cleanup(); 929 ip6_flowlabel_cleanup(); 930 ip6_route_cleanup(); 931 #ifdef CONFIG_PROC_FS 932 933 /* Cleanup code parts. */ 934 if6_proc_exit(); 935 ac6_proc_exit(); 936 ipv6_misc_proc_exit(); 937 udplite6_proc_exit(); 938 udp6_proc_exit(); 939 tcp6_proc_exit(); 940 raw6_proc_exit(); 941 #endif 942 ipv6_netfilter_fini(); 943 igmp6_cleanup(); 944 ndisc_cleanup(); 945 icmpv6_cleanup(); 946 #ifdef CONFIG_SYSCTL 947 ipv6_sysctl_unregister(); 948 #endif 949 cleanup_ipv6_mibs(); 950 proto_unregister(&rawv6_prot); 951 proto_unregister(&udplitev6_prot); 952 proto_unregister(&udpv6_prot); 953 proto_unregister(&tcpv6_prot); 954 } 955 module_exit(inet6_exit); 956 957 MODULE_ALIAS_NETPROTO(PF_INET6); 958