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/smp_lock.h> 46 #include <linux/netfilter_ipv6.h> 47 48 #include <net/ip.h> 49 #include <net/ipv6.h> 50 #include <net/udp.h> 51 #include <net/udplite.h> 52 #include <net/tcp.h> 53 #include <net/ipip.h> 54 #include <net/protocol.h> 55 #include <net/inet_common.h> 56 #include <net/transp_v6.h> 57 #include <net/ip6_route.h> 58 #include <net/addrconf.h> 59 #ifdef CONFIG_IPV6_TUNNEL 60 #include <net/ip6_tunnel.h> 61 #endif 62 #ifdef CONFIG_IPV6_MIP6 63 #include <net/mip6.h> 64 #endif 65 66 #include <asm/uaccess.h> 67 #include <asm/system.h> 68 69 MODULE_AUTHOR("Cast of dozens"); 70 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 71 MODULE_LICENSE("GPL"); 72 73 int sysctl_ipv6_bindv6only __read_mostly; 74 75 /* The inetsw table contains everything that inet_create needs to 76 * build a new socket. 77 */ 78 static struct list_head inetsw6[SOCK_MAX]; 79 static DEFINE_SPINLOCK(inetsw6_lock); 80 81 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 82 { 83 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 84 85 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 86 } 87 88 static int inet6_create(struct socket *sock, int protocol) 89 { 90 struct inet_sock *inet; 91 struct ipv6_pinfo *np; 92 struct sock *sk; 93 struct list_head *p; 94 struct inet_protosw *answer; 95 struct proto *answer_prot; 96 unsigned char answer_flags; 97 char answer_no_check; 98 int try_loading_module = 0; 99 int err; 100 101 if (sock->type != SOCK_RAW && 102 sock->type != SOCK_DGRAM && 103 !inet_ehash_secret) 104 build_ehash_secret(); 105 106 /* Look for the requested type/protocol pair. */ 107 answer = NULL; 108 lookup_protocol: 109 err = -ESOCKTNOSUPPORT; 110 rcu_read_lock(); 111 list_for_each_rcu(p, &inetsw6[sock->type]) { 112 answer = list_entry(p, struct inet_protosw, list); 113 114 /* Check the non-wild match. */ 115 if (protocol == answer->protocol) { 116 if (protocol != IPPROTO_IP) 117 break; 118 } else { 119 /* Check for the two wild cases. */ 120 if (IPPROTO_IP == protocol) { 121 protocol = answer->protocol; 122 break; 123 } 124 if (IPPROTO_IP == answer->protocol) 125 break; 126 } 127 err = -EPROTONOSUPPORT; 128 answer = NULL; 129 } 130 131 if (!answer) { 132 if (try_loading_module < 2) { 133 rcu_read_unlock(); 134 /* 135 * Be more specific, e.g. net-pf-10-proto-132-type-1 136 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 137 */ 138 if (++try_loading_module == 1) 139 request_module("net-pf-%d-proto-%d-type-%d", 140 PF_INET6, protocol, sock->type); 141 /* 142 * Fall back to generic, e.g. net-pf-10-proto-132 143 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 144 */ 145 else 146 request_module("net-pf-%d-proto-%d", 147 PF_INET6, protocol); 148 goto lookup_protocol; 149 } else 150 goto out_rcu_unlock; 151 } 152 153 err = -EPERM; 154 if (answer->capability > 0 && !capable(answer->capability)) 155 goto out_rcu_unlock; 156 157 sock->ops = answer->ops; 158 answer_prot = answer->prot; 159 answer_no_check = answer->no_check; 160 answer_flags = answer->flags; 161 rcu_read_unlock(); 162 163 BUG_TRAP(answer_prot->slab != NULL); 164 165 err = -ENOBUFS; 166 sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1); 167 if (sk == NULL) 168 goto out; 169 170 sock_init_data(sock, sk); 171 172 err = 0; 173 sk->sk_no_check = answer_no_check; 174 if (INET_PROTOSW_REUSE & answer_flags) 175 sk->sk_reuse = 1; 176 177 inet = inet_sk(sk); 178 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 179 180 if (SOCK_RAW == sock->type) { 181 inet->num = protocol; 182 if (IPPROTO_RAW == protocol) 183 inet->hdrincl = 1; 184 } 185 186 sk->sk_destruct = inet_sock_destruct; 187 sk->sk_family = PF_INET6; 188 sk->sk_protocol = protocol; 189 190 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 191 192 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 193 np->hop_limit = -1; 194 np->mcast_hops = -1; 195 np->mc_loop = 1; 196 np->pmtudisc = IPV6_PMTUDISC_WANT; 197 np->ipv6only = sysctl_ipv6_bindv6only; 198 199 /* Init the ipv4 part of the socket since we can have sockets 200 * using v6 API for ipv4. 201 */ 202 inet->uc_ttl = -1; 203 204 inet->mc_loop = 1; 205 inet->mc_ttl = 1; 206 inet->mc_index = 0; 207 inet->mc_list = NULL; 208 209 if (ipv4_config.no_pmtu_disc) 210 inet->pmtudisc = IP_PMTUDISC_DONT; 211 else 212 inet->pmtudisc = IP_PMTUDISC_WANT; 213 /* 214 * Increment only the relevant sk_prot->socks debug field, this changes 215 * the previous behaviour of incrementing both the equivalent to 216 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 217 * 218 * This allows better debug granularity as we'll know exactly how many 219 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 220 * transport protocol socks. -acme 221 */ 222 sk_refcnt_debug_inc(sk); 223 224 if (inet->num) { 225 /* It assumes that any protocol which allows 226 * the user to assign a number at socket 227 * creation time automatically shares. 228 */ 229 inet->sport = htons(inet->num); 230 sk->sk_prot->hash(sk); 231 } 232 if (sk->sk_prot->init) { 233 err = sk->sk_prot->init(sk); 234 if (err) { 235 sk_common_release(sk); 236 goto out; 237 } 238 } 239 out: 240 return err; 241 out_rcu_unlock: 242 rcu_read_unlock(); 243 goto out; 244 } 245 246 247 /* bind for INET6 API */ 248 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 249 { 250 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 251 struct sock *sk = sock->sk; 252 struct inet_sock *inet = inet_sk(sk); 253 struct ipv6_pinfo *np = inet6_sk(sk); 254 __be32 v4addr = 0; 255 unsigned short snum; 256 int addr_type = 0; 257 int err = 0; 258 259 /* If the socket has its own bind function then use it. */ 260 if (sk->sk_prot->bind) 261 return sk->sk_prot->bind(sk, uaddr, addr_len); 262 263 if (addr_len < SIN6_LEN_RFC2133) 264 return -EINVAL; 265 addr_type = ipv6_addr_type(&addr->sin6_addr); 266 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 267 return -EINVAL; 268 269 snum = ntohs(addr->sin6_port); 270 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 271 return -EACCES; 272 273 lock_sock(sk); 274 275 /* Check these errors (active socket, double bind). */ 276 if (sk->sk_state != TCP_CLOSE || inet->num) { 277 err = -EINVAL; 278 goto out; 279 } 280 281 /* Check if the address belongs to the host. */ 282 if (addr_type == IPV6_ADDR_MAPPED) { 283 v4addr = addr->sin6_addr.s6_addr32[3]; 284 if (inet_addr_type(v4addr) != RTN_LOCAL) { 285 err = -EADDRNOTAVAIL; 286 goto out; 287 } 288 } else { 289 if (addr_type != IPV6_ADDR_ANY) { 290 struct net_device *dev = NULL; 291 292 if (addr_type & IPV6_ADDR_LINKLOCAL) { 293 if (addr_len >= sizeof(struct sockaddr_in6) && 294 addr->sin6_scope_id) { 295 /* Override any existing binding, if another one 296 * is supplied by user. 297 */ 298 sk->sk_bound_dev_if = addr->sin6_scope_id; 299 } 300 301 /* Binding to link-local address requires an interface */ 302 if (!sk->sk_bound_dev_if) { 303 err = -EINVAL; 304 goto out; 305 } 306 dev = dev_get_by_index(sk->sk_bound_dev_if); 307 if (!dev) { 308 err = -ENODEV; 309 goto out; 310 } 311 } 312 313 /* ipv4 addr of the socket is invalid. Only the 314 * unspecified and mapped address have a v4 equivalent. 315 */ 316 v4addr = LOOPBACK4_IPV6; 317 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 318 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { 319 if (dev) 320 dev_put(dev); 321 err = -EADDRNOTAVAIL; 322 goto out; 323 } 324 } 325 if (dev) 326 dev_put(dev); 327 } 328 } 329 330 inet->rcv_saddr = v4addr; 331 inet->saddr = v4addr; 332 333 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 334 335 if (!(addr_type & IPV6_ADDR_MULTICAST)) 336 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 337 338 /* Make sure we are allowed to bind here. */ 339 if (sk->sk_prot->get_port(sk, snum)) { 340 inet_reset_saddr(sk); 341 err = -EADDRINUSE; 342 goto out; 343 } 344 345 if (addr_type != IPV6_ADDR_ANY) 346 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 347 if (snum) 348 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 349 inet->sport = htons(inet->num); 350 inet->dport = 0; 351 inet->daddr = 0; 352 out: 353 release_sock(sk); 354 return err; 355 } 356 357 EXPORT_SYMBOL(inet6_bind); 358 359 int inet6_release(struct socket *sock) 360 { 361 struct sock *sk = sock->sk; 362 363 if (sk == NULL) 364 return -EINVAL; 365 366 /* Free mc lists */ 367 ipv6_sock_mc_close(sk); 368 369 /* Free ac lists */ 370 ipv6_sock_ac_close(sk); 371 372 return inet_release(sock); 373 } 374 375 EXPORT_SYMBOL(inet6_release); 376 377 int inet6_destroy_sock(struct sock *sk) 378 { 379 struct ipv6_pinfo *np = inet6_sk(sk); 380 struct sk_buff *skb; 381 struct ipv6_txoptions *opt; 382 383 /* Release rx options */ 384 385 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 386 kfree_skb(skb); 387 388 /* Free flowlabels */ 389 fl6_free_socklist(sk); 390 391 /* Free tx options */ 392 393 if ((opt = xchg(&np->opt, NULL)) != NULL) 394 sock_kfree_s(sk, opt, opt->tot_len); 395 396 return 0; 397 } 398 399 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 400 401 /* 402 * This does both peername and sockname. 403 */ 404 405 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 406 int *uaddr_len, int peer) 407 { 408 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 409 struct sock *sk = sock->sk; 410 struct inet_sock *inet = inet_sk(sk); 411 struct ipv6_pinfo *np = inet6_sk(sk); 412 413 sin->sin6_family = AF_INET6; 414 sin->sin6_flowinfo = 0; 415 sin->sin6_scope_id = 0; 416 if (peer) { 417 if (!inet->dport) 418 return -ENOTCONN; 419 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 420 peer == 1) 421 return -ENOTCONN; 422 sin->sin6_port = inet->dport; 423 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 424 if (np->sndflow) 425 sin->sin6_flowinfo = np->flow_label; 426 } else { 427 if (ipv6_addr_any(&np->rcv_saddr)) 428 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 429 else 430 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 431 432 sin->sin6_port = inet->sport; 433 } 434 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 435 sin->sin6_scope_id = sk->sk_bound_dev_if; 436 *uaddr_len = sizeof(*sin); 437 return(0); 438 } 439 440 EXPORT_SYMBOL(inet6_getname); 441 442 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 443 { 444 struct sock *sk = sock->sk; 445 446 switch(cmd) 447 { 448 case SIOCGSTAMP: 449 return sock_get_timestamp(sk, (struct timeval __user *)arg); 450 451 case SIOCGSTAMPNS: 452 return sock_get_timestampns(sk, (struct timespec __user *)arg); 453 454 case SIOCADDRT: 455 case SIOCDELRT: 456 457 return(ipv6_route_ioctl(cmd,(void __user *)arg)); 458 459 case SIOCSIFADDR: 460 return addrconf_add_ifaddr((void __user *) arg); 461 case SIOCDIFADDR: 462 return addrconf_del_ifaddr((void __user *) arg); 463 case SIOCSIFDSTADDR: 464 return addrconf_set_dstaddr((void __user *) arg); 465 default: 466 if (!sk->sk_prot->ioctl) 467 return -ENOIOCTLCMD; 468 return sk->sk_prot->ioctl(sk, cmd, arg); 469 } 470 /*NOTREACHED*/ 471 return(0); 472 } 473 474 EXPORT_SYMBOL(inet6_ioctl); 475 476 const struct proto_ops inet6_stream_ops = { 477 .family = PF_INET6, 478 .owner = THIS_MODULE, 479 .release = inet6_release, 480 .bind = inet6_bind, 481 .connect = inet_stream_connect, /* ok */ 482 .socketpair = sock_no_socketpair, /* a do nothing */ 483 .accept = inet_accept, /* ok */ 484 .getname = inet6_getname, 485 .poll = tcp_poll, /* ok */ 486 .ioctl = inet6_ioctl, /* must change */ 487 .listen = inet_listen, /* ok */ 488 .shutdown = inet_shutdown, /* ok */ 489 .setsockopt = sock_common_setsockopt, /* ok */ 490 .getsockopt = sock_common_getsockopt, /* ok */ 491 .sendmsg = inet_sendmsg, /* ok */ 492 .recvmsg = sock_common_recvmsg, /* ok */ 493 .mmap = sock_no_mmap, 494 .sendpage = tcp_sendpage, 495 #ifdef CONFIG_COMPAT 496 .compat_setsockopt = compat_sock_common_setsockopt, 497 .compat_getsockopt = compat_sock_common_getsockopt, 498 #endif 499 }; 500 501 const struct proto_ops inet6_dgram_ops = { 502 .family = PF_INET6, 503 .owner = THIS_MODULE, 504 .release = inet6_release, 505 .bind = inet6_bind, 506 .connect = inet_dgram_connect, /* ok */ 507 .socketpair = sock_no_socketpair, /* a do nothing */ 508 .accept = sock_no_accept, /* a do nothing */ 509 .getname = inet6_getname, 510 .poll = udp_poll, /* ok */ 511 .ioctl = inet6_ioctl, /* must change */ 512 .listen = sock_no_listen, /* ok */ 513 .shutdown = inet_shutdown, /* ok */ 514 .setsockopt = sock_common_setsockopt, /* ok */ 515 .getsockopt = sock_common_getsockopt, /* ok */ 516 .sendmsg = inet_sendmsg, /* ok */ 517 .recvmsg = sock_common_recvmsg, /* ok */ 518 .mmap = sock_no_mmap, 519 .sendpage = sock_no_sendpage, 520 #ifdef CONFIG_COMPAT 521 .compat_setsockopt = compat_sock_common_setsockopt, 522 .compat_getsockopt = compat_sock_common_getsockopt, 523 #endif 524 }; 525 526 static struct net_proto_family inet6_family_ops = { 527 .family = PF_INET6, 528 .create = inet6_create, 529 .owner = THIS_MODULE, 530 }; 531 532 /* Same as inet6_dgram_ops, sans udp_poll. */ 533 static const struct proto_ops inet6_sockraw_ops = { 534 .family = PF_INET6, 535 .owner = THIS_MODULE, 536 .release = inet6_release, 537 .bind = inet6_bind, 538 .connect = inet_dgram_connect, /* ok */ 539 .socketpair = sock_no_socketpair, /* a do nothing */ 540 .accept = sock_no_accept, /* a do nothing */ 541 .getname = inet6_getname, 542 .poll = datagram_poll, /* ok */ 543 .ioctl = inet6_ioctl, /* must change */ 544 .listen = sock_no_listen, /* ok */ 545 .shutdown = inet_shutdown, /* ok */ 546 .setsockopt = sock_common_setsockopt, /* ok */ 547 .getsockopt = sock_common_getsockopt, /* ok */ 548 .sendmsg = inet_sendmsg, /* ok */ 549 .recvmsg = sock_common_recvmsg, /* ok */ 550 .mmap = sock_no_mmap, 551 .sendpage = sock_no_sendpage, 552 #ifdef CONFIG_COMPAT 553 .compat_setsockopt = compat_sock_common_setsockopt, 554 .compat_getsockopt = compat_sock_common_getsockopt, 555 #endif 556 }; 557 558 static struct inet_protosw rawv6_protosw = { 559 .type = SOCK_RAW, 560 .protocol = IPPROTO_IP, /* wild card */ 561 .prot = &rawv6_prot, 562 .ops = &inet6_sockraw_ops, 563 .capability = CAP_NET_RAW, 564 .no_check = UDP_CSUM_DEFAULT, 565 .flags = INET_PROTOSW_REUSE, 566 }; 567 568 void 569 inet6_register_protosw(struct inet_protosw *p) 570 { 571 struct list_head *lh; 572 struct inet_protosw *answer; 573 int protocol = p->protocol; 574 struct list_head *last_perm; 575 576 spin_lock_bh(&inetsw6_lock); 577 578 if (p->type >= SOCK_MAX) 579 goto out_illegal; 580 581 /* If we are trying to override a permanent protocol, bail. */ 582 answer = NULL; 583 last_perm = &inetsw6[p->type]; 584 list_for_each(lh, &inetsw6[p->type]) { 585 answer = list_entry(lh, struct inet_protosw, list); 586 587 /* Check only the non-wild match. */ 588 if (INET_PROTOSW_PERMANENT & answer->flags) { 589 if (protocol == answer->protocol) 590 break; 591 last_perm = lh; 592 } 593 594 answer = NULL; 595 } 596 if (answer) 597 goto out_permanent; 598 599 /* Add the new entry after the last permanent entry if any, so that 600 * the new entry does not override a permanent entry when matched with 601 * a wild-card protocol. But it is allowed to override any existing 602 * non-permanent entry. This means that when we remove this entry, the 603 * system automatically returns to the old behavior. 604 */ 605 list_add_rcu(&p->list, last_perm); 606 out: 607 spin_unlock_bh(&inetsw6_lock); 608 return; 609 610 out_permanent: 611 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 612 protocol); 613 goto out; 614 615 out_illegal: 616 printk(KERN_ERR 617 "Ignoring attempt to register invalid socket type %d.\n", 618 p->type); 619 goto out; 620 } 621 622 EXPORT_SYMBOL(inet6_register_protosw); 623 624 void 625 inet6_unregister_protosw(struct inet_protosw *p) 626 { 627 if (INET_PROTOSW_PERMANENT & p->flags) { 628 printk(KERN_ERR 629 "Attempt to unregister permanent protocol %d.\n", 630 p->protocol); 631 } else { 632 spin_lock_bh(&inetsw6_lock); 633 list_del_rcu(&p->list); 634 spin_unlock_bh(&inetsw6_lock); 635 636 synchronize_net(); 637 } 638 } 639 640 EXPORT_SYMBOL(inet6_unregister_protosw); 641 642 int inet6_sk_rebuild_header(struct sock *sk) 643 { 644 int err; 645 struct dst_entry *dst; 646 struct ipv6_pinfo *np = inet6_sk(sk); 647 648 dst = __sk_dst_check(sk, np->dst_cookie); 649 650 if (dst == NULL) { 651 struct inet_sock *inet = inet_sk(sk); 652 struct in6_addr *final_p = NULL, final; 653 struct flowi fl; 654 655 memset(&fl, 0, sizeof(fl)); 656 fl.proto = sk->sk_protocol; 657 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 658 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 659 fl.fl6_flowlabel = np->flow_label; 660 fl.oif = sk->sk_bound_dev_if; 661 fl.fl_ip_dport = inet->dport; 662 fl.fl_ip_sport = inet->sport; 663 security_sk_classify_flow(sk, &fl); 664 665 if (np->opt && np->opt->srcrt) { 666 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 667 ipv6_addr_copy(&final, &fl.fl6_dst); 668 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 669 final_p = &final; 670 } 671 672 err = ip6_dst_lookup(sk, &dst, &fl); 673 if (err) { 674 sk->sk_route_caps = 0; 675 return err; 676 } 677 if (final_p) 678 ipv6_addr_copy(&fl.fl6_dst, final_p); 679 680 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 681 sk->sk_err_soft = -err; 682 return err; 683 } 684 685 __ip6_dst_store(sk, dst, NULL, NULL); 686 } 687 688 return 0; 689 } 690 691 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 692 693 int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 694 { 695 struct ipv6_pinfo *np = inet6_sk(sk); 696 struct inet6_skb_parm *opt = IP6CB(skb); 697 698 if (np->rxopt.all) { 699 if ((opt->hop && (np->rxopt.bits.hopopts || 700 np->rxopt.bits.ohopopts)) || 701 ((IPV6_FLOWINFO_MASK & 702 *(__be32 *)skb_network_header(skb)) && 703 np->rxopt.bits.rxflow) || 704 (opt->srcrt && (np->rxopt.bits.srcrt || 705 np->rxopt.bits.osrcrt)) || 706 ((opt->dst1 || opt->dst0) && 707 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 708 return 1; 709 } 710 return 0; 711 } 712 713 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 714 715 static int __init init_ipv6_mibs(void) 716 { 717 if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib), 718 __alignof__(struct ipstats_mib)) < 0) 719 goto err_ip_mib; 720 if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib), 721 __alignof__(struct icmpv6_mib)) < 0) 722 goto err_icmp_mib; 723 if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib), 724 __alignof__(struct udp_mib)) < 0) 725 goto err_udp_mib; 726 if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib), 727 __alignof__(struct udp_mib)) < 0) 728 goto err_udplite_mib; 729 return 0; 730 731 err_udplite_mib: 732 snmp_mib_free((void **)udp_stats_in6); 733 err_udp_mib: 734 snmp_mib_free((void **)icmpv6_statistics); 735 err_icmp_mib: 736 snmp_mib_free((void **)ipv6_statistics); 737 err_ip_mib: 738 return -ENOMEM; 739 740 } 741 742 static void cleanup_ipv6_mibs(void) 743 { 744 snmp_mib_free((void **)ipv6_statistics); 745 snmp_mib_free((void **)icmpv6_statistics); 746 snmp_mib_free((void **)udp_stats_in6); 747 snmp_mib_free((void **)udplite_stats_in6); 748 } 749 750 static int __init inet6_init(void) 751 { 752 struct sk_buff *dummy_skb; 753 struct list_head *r; 754 int err; 755 756 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 757 758 #ifdef MODULE 759 #if 0 /* FIXME --RR */ 760 if (!mod_member_present(&__this_module, can_unload)) 761 return -EINVAL; 762 763 __this_module.can_unload = &ipv6_unload; 764 #endif 765 #endif 766 767 err = proto_register(&tcpv6_prot, 1); 768 if (err) 769 goto out; 770 771 err = proto_register(&udpv6_prot, 1); 772 if (err) 773 goto out_unregister_tcp_proto; 774 775 err = proto_register(&udplitev6_prot, 1); 776 if (err) 777 goto out_unregister_udp_proto; 778 779 err = proto_register(&rawv6_prot, 1); 780 if (err) 781 goto out_unregister_udplite_proto; 782 783 784 /* Register the socket-side information for inet6_create. */ 785 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 786 INIT_LIST_HEAD(r); 787 788 /* We MUST register RAW sockets before we create the ICMP6, 789 * IGMP6, or NDISC control sockets. 790 */ 791 inet6_register_protosw(&rawv6_protosw); 792 793 /* Register the family here so that the init calls below will 794 * be able to create sockets. (?? is this dangerous ??) 795 */ 796 err = sock_register(&inet6_family_ops); 797 if (err) 798 goto out_unregister_raw_proto; 799 800 /* Initialise ipv6 mibs */ 801 err = init_ipv6_mibs(); 802 if (err) 803 goto out_unregister_sock; 804 805 /* 806 * ipngwg API draft makes clear that the correct semantics 807 * for TCP and UDP is to consider one TCP and UDP instance 808 * in a host availiable by both INET and INET6 APIs and 809 * able to communicate via both network protocols. 810 */ 811 812 #ifdef CONFIG_SYSCTL 813 ipv6_sysctl_register(); 814 #endif 815 err = icmpv6_init(&inet6_family_ops); 816 if (err) 817 goto icmp_fail; 818 err = ndisc_init(&inet6_family_ops); 819 if (err) 820 goto ndisc_fail; 821 err = igmp6_init(&inet6_family_ops); 822 if (err) 823 goto igmp_fail; 824 err = ipv6_netfilter_init(); 825 if (err) 826 goto netfilter_fail; 827 /* Create /proc/foo6 entries. */ 828 #ifdef CONFIG_PROC_FS 829 err = -ENOMEM; 830 if (raw6_proc_init()) 831 goto proc_raw6_fail; 832 if (tcp6_proc_init()) 833 goto proc_tcp6_fail; 834 if (udp6_proc_init()) 835 goto proc_udp6_fail; 836 if (udplite6_proc_init()) 837 goto proc_udplite6_fail; 838 if (ipv6_misc_proc_init()) 839 goto proc_misc6_fail; 840 841 if (ac6_proc_init()) 842 goto proc_anycast6_fail; 843 if (if6_proc_init()) 844 goto proc_if6_fail; 845 #endif 846 ip6_route_init(); 847 ip6_flowlabel_init(); 848 err = addrconf_init(); 849 if (err) 850 goto addrconf_fail; 851 852 /* Init v6 extension headers. */ 853 ipv6_rthdr_init(); 854 ipv6_frag_init(); 855 ipv6_nodata_init(); 856 ipv6_destopt_init(); 857 #ifdef CONFIG_IPV6_MIP6 858 mip6_init(); 859 #endif 860 861 /* Init v6 transport protocols. */ 862 udpv6_init(); 863 udplitev6_init(); 864 tcpv6_init(); 865 866 ipv6_packet_init(); 867 err = 0; 868 out: 869 return err; 870 871 addrconf_fail: 872 ip6_flowlabel_cleanup(); 873 ip6_route_cleanup(); 874 #ifdef CONFIG_PROC_FS 875 if6_proc_exit(); 876 proc_if6_fail: 877 ac6_proc_exit(); 878 proc_anycast6_fail: 879 ipv6_misc_proc_exit(); 880 proc_misc6_fail: 881 udplite6_proc_exit(); 882 proc_udplite6_fail: 883 udp6_proc_exit(); 884 proc_udp6_fail: 885 tcp6_proc_exit(); 886 proc_tcp6_fail: 887 raw6_proc_exit(); 888 proc_raw6_fail: 889 #endif 890 ipv6_netfilter_fini(); 891 netfilter_fail: 892 igmp6_cleanup(); 893 igmp_fail: 894 ndisc_cleanup(); 895 ndisc_fail: 896 icmpv6_cleanup(); 897 icmp_fail: 898 #ifdef CONFIG_SYSCTL 899 ipv6_sysctl_unregister(); 900 #endif 901 cleanup_ipv6_mibs(); 902 out_unregister_sock: 903 sock_unregister(PF_INET6); 904 out_unregister_raw_proto: 905 proto_unregister(&rawv6_prot); 906 out_unregister_udplite_proto: 907 proto_unregister(&udplitev6_prot); 908 out_unregister_udp_proto: 909 proto_unregister(&udpv6_prot); 910 out_unregister_tcp_proto: 911 proto_unregister(&tcpv6_prot); 912 goto out; 913 } 914 module_init(inet6_init); 915 916 static void __exit inet6_exit(void) 917 { 918 /* First of all disallow new sockets creation. */ 919 sock_unregister(PF_INET6); 920 /* Disallow any further netlink messages */ 921 rtnl_unregister_all(PF_INET6); 922 923 /* Cleanup code parts. */ 924 ipv6_packet_cleanup(); 925 #ifdef CONFIG_IPV6_MIP6 926 mip6_fini(); 927 #endif 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