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