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 * Fixes: 11 * piggy, Karl Knutson : Socket protocol table 12 * Hideaki YOSHIFUJI : sin6_scope_id support 13 * Arnaldo Melo : check proc_net_create return, cleanups 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 */ 20 21 #define pr_fmt(fmt) "IPv6: " fmt 22 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/errno.h> 26 #include <linux/types.h> 27 #include <linux/socket.h> 28 #include <linux/in.h> 29 #include <linux/kernel.h> 30 #include <linux/timer.h> 31 #include <linux/string.h> 32 #include <linux/sockios.h> 33 #include <linux/net.h> 34 #include <linux/fcntl.h> 35 #include <linux/mm.h> 36 #include <linux/interrupt.h> 37 #include <linux/proc_fs.h> 38 #include <linux/stat.h> 39 #include <linux/init.h> 40 #include <linux/slab.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/protocol.h> 53 #include <net/inet_common.h> 54 #include <net/route.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 <linux/mroute6.h> 64 65 MODULE_AUTHOR("Cast of dozens"); 66 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 67 MODULE_LICENSE("GPL"); 68 69 /* The inetsw6 table contains everything that inet6_create needs to 70 * build a new socket. 71 */ 72 static struct list_head inetsw6[SOCK_MAX]; 73 static DEFINE_SPINLOCK(inetsw6_lock); 74 75 struct ipv6_params ipv6_defaults = { 76 .disable_ipv6 = 0, 77 .autoconf = 1, 78 }; 79 80 static int disable_ipv6_mod; 81 82 module_param_named(disable, disable_ipv6_mod, int, 0444); 83 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 84 85 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 86 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 87 88 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 89 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 90 91 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 92 { 93 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 94 95 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 96 } 97 98 static int inet6_create(struct net *net, struct socket *sock, int protocol, 99 int kern) 100 { 101 struct inet_sock *inet; 102 struct ipv6_pinfo *np; 103 struct sock *sk; 104 struct inet_protosw *answer; 105 struct proto *answer_prot; 106 unsigned char answer_flags; 107 char answer_no_check; 108 int try_loading_module = 0; 109 int err; 110 111 if (sock->type != SOCK_RAW && 112 sock->type != SOCK_DGRAM && 113 !inet_ehash_secret) 114 build_ehash_secret(); 115 116 /* Look for the requested type/protocol pair. */ 117 lookup_protocol: 118 err = -ESOCKTNOSUPPORT; 119 rcu_read_lock(); 120 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 121 122 err = 0; 123 /* Check the non-wild match. */ 124 if (protocol == answer->protocol) { 125 if (protocol != IPPROTO_IP) 126 break; 127 } else { 128 /* Check for the two wild cases. */ 129 if (IPPROTO_IP == protocol) { 130 protocol = answer->protocol; 131 break; 132 } 133 if (IPPROTO_IP == answer->protocol) 134 break; 135 } 136 err = -EPROTONOSUPPORT; 137 } 138 139 if (err) { 140 if (try_loading_module < 2) { 141 rcu_read_unlock(); 142 /* 143 * Be more specific, e.g. net-pf-10-proto-132-type-1 144 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 145 */ 146 if (++try_loading_module == 1) 147 request_module("net-pf-%d-proto-%d-type-%d", 148 PF_INET6, protocol, sock->type); 149 /* 150 * Fall back to generic, e.g. net-pf-10-proto-132 151 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 152 */ 153 else 154 request_module("net-pf-%d-proto-%d", 155 PF_INET6, protocol); 156 goto lookup_protocol; 157 } else 158 goto out_rcu_unlock; 159 } 160 161 err = -EPERM; 162 if (sock->type == SOCK_RAW && !kern && 163 !ns_capable(net->user_ns, CAP_NET_RAW)) 164 goto out_rcu_unlock; 165 166 sock->ops = answer->ops; 167 answer_prot = answer->prot; 168 answer_no_check = answer->no_check; 169 answer_flags = answer->flags; 170 rcu_read_unlock(); 171 172 WARN_ON(answer_prot->slab == NULL); 173 174 err = -ENOBUFS; 175 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 176 if (sk == NULL) 177 goto out; 178 179 sock_init_data(sock, sk); 180 181 err = 0; 182 sk->sk_no_check = answer_no_check; 183 if (INET_PROTOSW_REUSE & answer_flags) 184 sk->sk_reuse = SK_CAN_REUSE; 185 186 inet = inet_sk(sk); 187 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 188 189 if (SOCK_RAW == sock->type) { 190 inet->inet_num = protocol; 191 if (IPPROTO_RAW == protocol) 192 inet->hdrincl = 1; 193 } 194 195 sk->sk_destruct = inet_sock_destruct; 196 sk->sk_family = PF_INET6; 197 sk->sk_protocol = protocol; 198 199 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 200 201 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 202 np->hop_limit = -1; 203 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 204 np->mc_loop = 1; 205 np->pmtudisc = IPV6_PMTUDISC_WANT; 206 np->ipv6only = net->ipv6.sysctl.bindv6only; 207 208 /* Init the ipv4 part of the socket since we can have sockets 209 * using v6 API for ipv4. 210 */ 211 inet->uc_ttl = -1; 212 213 inet->mc_loop = 1; 214 inet->mc_ttl = 1; 215 inet->mc_index = 0; 216 inet->mc_list = NULL; 217 inet->rcv_tos = 0; 218 219 if (ipv4_config.no_pmtu_disc) 220 inet->pmtudisc = IP_PMTUDISC_DONT; 221 else 222 inet->pmtudisc = IP_PMTUDISC_WANT; 223 /* 224 * Increment only the relevant sk_prot->socks debug field, this changes 225 * the previous behaviour of incrementing both the equivalent to 226 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 227 * 228 * This allows better debug granularity as we'll know exactly how many 229 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 230 * transport protocol socks. -acme 231 */ 232 sk_refcnt_debug_inc(sk); 233 234 if (inet->inet_num) { 235 /* It assumes that any protocol which allows 236 * the user to assign a number at socket 237 * creation time automatically shares. 238 */ 239 inet->inet_sport = htons(inet->inet_num); 240 sk->sk_prot->hash(sk); 241 } 242 if (sk->sk_prot->init) { 243 err = sk->sk_prot->init(sk); 244 if (err) { 245 sk_common_release(sk); 246 goto out; 247 } 248 } 249 out: 250 return err; 251 out_rcu_unlock: 252 rcu_read_unlock(); 253 goto out; 254 } 255 256 257 /* bind for INET6 API */ 258 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 259 { 260 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 261 struct sock *sk = sock->sk; 262 struct inet_sock *inet = inet_sk(sk); 263 struct ipv6_pinfo *np = inet6_sk(sk); 264 struct net *net = sock_net(sk); 265 __be32 v4addr = 0; 266 unsigned short snum; 267 int addr_type = 0; 268 int err = 0; 269 270 /* If the socket has its own bind function then use it. */ 271 if (sk->sk_prot->bind) 272 return sk->sk_prot->bind(sk, uaddr, addr_len); 273 274 if (addr_len < SIN6_LEN_RFC2133) 275 return -EINVAL; 276 277 if (addr->sin6_family != AF_INET6) 278 return -EAFNOSUPPORT; 279 280 addr_type = ipv6_addr_type(&addr->sin6_addr); 281 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 282 return -EINVAL; 283 284 snum = ntohs(addr->sin6_port); 285 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 286 return -EACCES; 287 288 lock_sock(sk); 289 290 /* Check these errors (active socket, double bind). */ 291 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 292 err = -EINVAL; 293 goto out; 294 } 295 296 /* Check if the address belongs to the host. */ 297 if (addr_type == IPV6_ADDR_MAPPED) { 298 int chk_addr_ret; 299 300 /* Binding to v4-mapped address on a v6-only socket 301 * makes no sense 302 */ 303 if (np->ipv6only) { 304 err = -EINVAL; 305 goto out; 306 } 307 308 /* Reproduce AF_INET checks to make the bindings consistent */ 309 v4addr = addr->sin6_addr.s6_addr32[3]; 310 chk_addr_ret = inet_addr_type(net, v4addr); 311 if (!sysctl_ip_nonlocal_bind && 312 !(inet->freebind || inet->transparent) && 313 v4addr != htonl(INADDR_ANY) && 314 chk_addr_ret != RTN_LOCAL && 315 chk_addr_ret != RTN_MULTICAST && 316 chk_addr_ret != RTN_BROADCAST) { 317 err = -EADDRNOTAVAIL; 318 goto out; 319 } 320 } else { 321 if (addr_type != IPV6_ADDR_ANY) { 322 struct net_device *dev = NULL; 323 324 rcu_read_lock(); 325 if (__ipv6_addr_needs_scope_id(addr_type)) { 326 if (addr_len >= sizeof(struct sockaddr_in6) && 327 addr->sin6_scope_id) { 328 /* Override any existing binding, if another one 329 * is supplied by user. 330 */ 331 sk->sk_bound_dev_if = addr->sin6_scope_id; 332 } 333 334 /* Binding to link-local address requires an interface */ 335 if (!sk->sk_bound_dev_if) { 336 err = -EINVAL; 337 goto out_unlock; 338 } 339 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 340 if (!dev) { 341 err = -ENODEV; 342 goto out_unlock; 343 } 344 } 345 346 /* ipv4 addr of the socket is invalid. Only the 347 * unspecified and mapped address have a v4 equivalent. 348 */ 349 v4addr = LOOPBACK4_IPV6; 350 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 351 if (!(inet->freebind || inet->transparent) && 352 !ipv6_chk_addr(net, &addr->sin6_addr, 353 dev, 0)) { 354 err = -EADDRNOTAVAIL; 355 goto out_unlock; 356 } 357 } 358 rcu_read_unlock(); 359 } 360 } 361 362 inet->inet_rcv_saddr = v4addr; 363 inet->inet_saddr = v4addr; 364 365 np->rcv_saddr = addr->sin6_addr; 366 367 if (!(addr_type & IPV6_ADDR_MULTICAST)) 368 np->saddr = addr->sin6_addr; 369 370 /* Make sure we are allowed to bind here. */ 371 if (sk->sk_prot->get_port(sk, snum)) { 372 inet_reset_saddr(sk); 373 err = -EADDRINUSE; 374 goto out; 375 } 376 377 if (addr_type != IPV6_ADDR_ANY) { 378 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 379 if (addr_type != IPV6_ADDR_MAPPED) 380 np->ipv6only = 1; 381 } 382 if (snum) 383 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 384 inet->inet_sport = htons(inet->inet_num); 385 inet->inet_dport = 0; 386 inet->inet_daddr = 0; 387 out: 388 release_sock(sk); 389 return err; 390 out_unlock: 391 rcu_read_unlock(); 392 goto out; 393 } 394 EXPORT_SYMBOL(inet6_bind); 395 396 int inet6_release(struct socket *sock) 397 { 398 struct sock *sk = sock->sk; 399 400 if (sk == NULL) 401 return -EINVAL; 402 403 /* Free mc lists */ 404 ipv6_sock_mc_close(sk); 405 406 /* Free ac lists */ 407 ipv6_sock_ac_close(sk); 408 409 return inet_release(sock); 410 } 411 EXPORT_SYMBOL(inet6_release); 412 413 void inet6_destroy_sock(struct sock *sk) 414 { 415 struct ipv6_pinfo *np = inet6_sk(sk); 416 struct sk_buff *skb; 417 struct ipv6_txoptions *opt; 418 419 /* Release rx options */ 420 421 skb = xchg(&np->pktoptions, NULL); 422 if (skb != NULL) 423 kfree_skb(skb); 424 425 skb = xchg(&np->rxpmtu, NULL); 426 if (skb != NULL) 427 kfree_skb(skb); 428 429 /* Free flowlabels */ 430 fl6_free_socklist(sk); 431 432 /* Free tx options */ 433 434 opt = xchg(&np->opt, NULL); 435 if (opt != NULL) 436 sock_kfree_s(sk, opt, opt->tot_len); 437 } 438 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 439 440 /* 441 * This does both peername and sockname. 442 */ 443 444 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 445 int *uaddr_len, int peer) 446 { 447 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 448 struct sock *sk = sock->sk; 449 struct inet_sock *inet = inet_sk(sk); 450 struct ipv6_pinfo *np = inet6_sk(sk); 451 452 sin->sin6_family = AF_INET6; 453 sin->sin6_flowinfo = 0; 454 sin->sin6_scope_id = 0; 455 if (peer) { 456 if (!inet->inet_dport) 457 return -ENOTCONN; 458 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 459 peer == 1) 460 return -ENOTCONN; 461 sin->sin6_port = inet->inet_dport; 462 sin->sin6_addr = np->daddr; 463 if (np->sndflow) 464 sin->sin6_flowinfo = np->flow_label; 465 } else { 466 if (ipv6_addr_any(&np->rcv_saddr)) 467 sin->sin6_addr = np->saddr; 468 else 469 sin->sin6_addr = np->rcv_saddr; 470 471 sin->sin6_port = inet->inet_sport; 472 } 473 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 474 sk->sk_bound_dev_if); 475 *uaddr_len = sizeof(*sin); 476 return 0; 477 } 478 EXPORT_SYMBOL(inet6_getname); 479 480 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 481 { 482 struct sock *sk = sock->sk; 483 struct net *net = sock_net(sk); 484 485 switch (cmd) { 486 case SIOCGSTAMP: 487 return sock_get_timestamp(sk, (struct timeval __user *)arg); 488 489 case SIOCGSTAMPNS: 490 return sock_get_timestampns(sk, (struct timespec __user *)arg); 491 492 case SIOCADDRT: 493 case SIOCDELRT: 494 495 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 496 497 case SIOCSIFADDR: 498 return addrconf_add_ifaddr(net, (void __user *) arg); 499 case SIOCDIFADDR: 500 return addrconf_del_ifaddr(net, (void __user *) arg); 501 case SIOCSIFDSTADDR: 502 return addrconf_set_dstaddr(net, (void __user *) arg); 503 default: 504 if (!sk->sk_prot->ioctl) 505 return -ENOIOCTLCMD; 506 return sk->sk_prot->ioctl(sk, cmd, arg); 507 } 508 /*NOTREACHED*/ 509 return 0; 510 } 511 EXPORT_SYMBOL(inet6_ioctl); 512 513 const struct proto_ops inet6_stream_ops = { 514 .family = PF_INET6, 515 .owner = THIS_MODULE, 516 .release = inet6_release, 517 .bind = inet6_bind, 518 .connect = inet_stream_connect, /* ok */ 519 .socketpair = sock_no_socketpair, /* a do nothing */ 520 .accept = inet_accept, /* ok */ 521 .getname = inet6_getname, 522 .poll = tcp_poll, /* ok */ 523 .ioctl = inet6_ioctl, /* must change */ 524 .listen = inet_listen, /* ok */ 525 .shutdown = inet_shutdown, /* ok */ 526 .setsockopt = sock_common_setsockopt, /* ok */ 527 .getsockopt = sock_common_getsockopt, /* ok */ 528 .sendmsg = inet_sendmsg, /* ok */ 529 .recvmsg = inet_recvmsg, /* ok */ 530 .mmap = sock_no_mmap, 531 .sendpage = inet_sendpage, 532 .splice_read = tcp_splice_read, 533 #ifdef CONFIG_COMPAT 534 .compat_setsockopt = compat_sock_common_setsockopt, 535 .compat_getsockopt = compat_sock_common_getsockopt, 536 #endif 537 }; 538 539 const struct proto_ops inet6_dgram_ops = { 540 .family = PF_INET6, 541 .owner = THIS_MODULE, 542 .release = inet6_release, 543 .bind = inet6_bind, 544 .connect = inet_dgram_connect, /* ok */ 545 .socketpair = sock_no_socketpair, /* a do nothing */ 546 .accept = sock_no_accept, /* a do nothing */ 547 .getname = inet6_getname, 548 .poll = udp_poll, /* ok */ 549 .ioctl = inet6_ioctl, /* must change */ 550 .listen = sock_no_listen, /* ok */ 551 .shutdown = inet_shutdown, /* ok */ 552 .setsockopt = sock_common_setsockopt, /* ok */ 553 .getsockopt = sock_common_getsockopt, /* ok */ 554 .sendmsg = inet_sendmsg, /* ok */ 555 .recvmsg = inet_recvmsg, /* ok */ 556 .mmap = sock_no_mmap, 557 .sendpage = sock_no_sendpage, 558 #ifdef CONFIG_COMPAT 559 .compat_setsockopt = compat_sock_common_setsockopt, 560 .compat_getsockopt = compat_sock_common_getsockopt, 561 #endif 562 }; 563 564 static const struct net_proto_family inet6_family_ops = { 565 .family = PF_INET6, 566 .create = inet6_create, 567 .owner = THIS_MODULE, 568 }; 569 570 int inet6_register_protosw(struct inet_protosw *p) 571 { 572 struct list_head *lh; 573 struct inet_protosw *answer; 574 struct list_head *last_perm; 575 int protocol = p->protocol; 576 int ret; 577 578 spin_lock_bh(&inetsw6_lock); 579 580 ret = -EINVAL; 581 if (p->type >= SOCK_MAX) 582 goto out_illegal; 583 584 /* If we are trying to override a permanent protocol, bail. */ 585 answer = NULL; 586 ret = -EPERM; 587 last_perm = &inetsw6[p->type]; 588 list_for_each(lh, &inetsw6[p->type]) { 589 answer = list_entry(lh, struct inet_protosw, list); 590 591 /* Check only the non-wild match. */ 592 if (INET_PROTOSW_PERMANENT & answer->flags) { 593 if (protocol == answer->protocol) 594 break; 595 last_perm = lh; 596 } 597 598 answer = NULL; 599 } 600 if (answer) 601 goto out_permanent; 602 603 /* Add the new entry after the last permanent entry if any, so that 604 * the new entry does not override a permanent entry when matched with 605 * a wild-card protocol. But it is allowed to override any existing 606 * non-permanent entry. This means that when we remove this entry, the 607 * system automatically returns to the old behavior. 608 */ 609 list_add_rcu(&p->list, last_perm); 610 ret = 0; 611 out: 612 spin_unlock_bh(&inetsw6_lock); 613 return ret; 614 615 out_permanent: 616 pr_err("Attempt to override permanent protocol %d\n", protocol); 617 goto out; 618 619 out_illegal: 620 pr_err("Ignoring attempt to register invalid socket type %d\n", 621 p->type); 622 goto out; 623 } 624 EXPORT_SYMBOL(inet6_register_protosw); 625 626 void 627 inet6_unregister_protosw(struct inet_protosw *p) 628 { 629 if (INET_PROTOSW_PERMANENT & p->flags) { 630 pr_err("Attempt to unregister permanent protocol %d\n", 631 p->protocol); 632 } else { 633 spin_lock_bh(&inetsw6_lock); 634 list_del_rcu(&p->list); 635 spin_unlock_bh(&inetsw6_lock); 636 637 synchronize_net(); 638 } 639 } 640 EXPORT_SYMBOL(inet6_unregister_protosw); 641 642 int inet6_sk_rebuild_header(struct sock *sk) 643 { 644 struct ipv6_pinfo *np = inet6_sk(sk); 645 struct dst_entry *dst; 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, final; 652 struct flowi6 fl6; 653 654 memset(&fl6, 0, sizeof(fl6)); 655 fl6.flowi6_proto = sk->sk_protocol; 656 fl6.daddr = np->daddr; 657 fl6.saddr = np->saddr; 658 fl6.flowlabel = np->flow_label; 659 fl6.flowi6_oif = sk->sk_bound_dev_if; 660 fl6.flowi6_mark = sk->sk_mark; 661 fl6.fl6_dport = inet->inet_dport; 662 fl6.fl6_sport = inet->inet_sport; 663 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 664 665 final_p = fl6_update_dst(&fl6, np->opt, &final); 666 667 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); 668 if (IS_ERR(dst)) { 669 sk->sk_route_caps = 0; 670 sk->sk_err_soft = -PTR_ERR(dst); 671 return PTR_ERR(dst); 672 } 673 674 __ip6_dst_store(sk, dst, NULL, NULL); 675 } 676 677 return 0; 678 } 679 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 680 681 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb) 682 { 683 const struct ipv6_pinfo *np = inet6_sk(sk); 684 const struct inet6_skb_parm *opt = IP6CB(skb); 685 686 if (np->rxopt.all) { 687 if ((opt->hop && (np->rxopt.bits.hopopts || 688 np->rxopt.bits.ohopopts)) || 689 ((IPV6_FLOWINFO_MASK & 690 *(__be32 *)skb_network_header(skb)) && 691 np->rxopt.bits.rxflow) || 692 (opt->srcrt && (np->rxopt.bits.srcrt || 693 np->rxopt.bits.osrcrt)) || 694 ((opt->dst1 || opt->dst0) && 695 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 696 return true; 697 } 698 return false; 699 } 700 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 701 702 static struct packet_type ipv6_packet_type __read_mostly = { 703 .type = cpu_to_be16(ETH_P_IPV6), 704 .func = ipv6_rcv, 705 }; 706 707 static int __init ipv6_packet_init(void) 708 { 709 dev_add_pack(&ipv6_packet_type); 710 return 0; 711 } 712 713 static void ipv6_packet_cleanup(void) 714 { 715 dev_remove_pack(&ipv6_packet_type); 716 } 717 718 static int __net_init ipv6_init_mibs(struct net *net) 719 { 720 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6, 721 sizeof(struct udp_mib), 722 __alignof__(struct udp_mib)) < 0) 723 return -ENOMEM; 724 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6, 725 sizeof(struct udp_mib), 726 __alignof__(struct udp_mib)) < 0) 727 goto err_udplite_mib; 728 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics, 729 sizeof(struct ipstats_mib), 730 __alignof__(struct ipstats_mib)) < 0) 731 goto err_ip_mib; 732 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics, 733 sizeof(struct icmpv6_mib), 734 __alignof__(struct icmpv6_mib)) < 0) 735 goto err_icmp_mib; 736 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 737 GFP_KERNEL); 738 if (!net->mib.icmpv6msg_statistics) 739 goto err_icmpmsg_mib; 740 return 0; 741 742 err_icmpmsg_mib: 743 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 744 err_icmp_mib: 745 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 746 err_ip_mib: 747 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 748 err_udplite_mib: 749 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 750 return -ENOMEM; 751 } 752 753 static void ipv6_cleanup_mibs(struct net *net) 754 { 755 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 756 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 757 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 758 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 759 kfree(net->mib.icmpv6msg_statistics); 760 } 761 762 static int __net_init inet6_net_init(struct net *net) 763 { 764 int err = 0; 765 766 net->ipv6.sysctl.bindv6only = 0; 767 net->ipv6.sysctl.icmpv6_time = 1*HZ; 768 769 err = ipv6_init_mibs(net); 770 if (err) 771 return err; 772 #ifdef CONFIG_PROC_FS 773 err = udp6_proc_init(net); 774 if (err) 775 goto out; 776 err = tcp6_proc_init(net); 777 if (err) 778 goto proc_tcp6_fail; 779 err = ac6_proc_init(net); 780 if (err) 781 goto proc_ac6_fail; 782 #endif 783 return err; 784 785 #ifdef CONFIG_PROC_FS 786 proc_ac6_fail: 787 tcp6_proc_exit(net); 788 proc_tcp6_fail: 789 udp6_proc_exit(net); 790 out: 791 ipv6_cleanup_mibs(net); 792 return err; 793 #endif 794 } 795 796 static void __net_exit inet6_net_exit(struct net *net) 797 { 798 #ifdef CONFIG_PROC_FS 799 udp6_proc_exit(net); 800 tcp6_proc_exit(net); 801 ac6_proc_exit(net); 802 #endif 803 ipv6_cleanup_mibs(net); 804 } 805 806 static struct pernet_operations inet6_net_ops = { 807 .init = inet6_net_init, 808 .exit = inet6_net_exit, 809 }; 810 811 static int __init inet6_init(void) 812 { 813 struct list_head *r; 814 int err = 0; 815 816 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb)); 817 818 /* Register the socket-side information for inet6_create. */ 819 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 820 INIT_LIST_HEAD(r); 821 822 if (disable_ipv6_mod) { 823 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 824 goto out; 825 } 826 827 err = proto_register(&tcpv6_prot, 1); 828 if (err) 829 goto out; 830 831 err = proto_register(&udpv6_prot, 1); 832 if (err) 833 goto out_unregister_tcp_proto; 834 835 err = proto_register(&udplitev6_prot, 1); 836 if (err) 837 goto out_unregister_udp_proto; 838 839 err = proto_register(&rawv6_prot, 1); 840 if (err) 841 goto out_unregister_udplite_proto; 842 843 844 /* We MUST register RAW sockets before we create the ICMP6, 845 * IGMP6, or NDISC control sockets. 846 */ 847 err = rawv6_init(); 848 if (err) 849 goto out_unregister_raw_proto; 850 851 /* Register the family here so that the init calls below will 852 * be able to create sockets. (?? is this dangerous ??) 853 */ 854 err = sock_register(&inet6_family_ops); 855 if (err) 856 goto out_sock_register_fail; 857 858 tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 859 860 /* 861 * ipngwg API draft makes clear that the correct semantics 862 * for TCP and UDP is to consider one TCP and UDP instance 863 * in a host available by both INET and INET6 APIs and 864 * able to communicate via both network protocols. 865 */ 866 867 err = register_pernet_subsys(&inet6_net_ops); 868 if (err) 869 goto register_pernet_fail; 870 err = icmpv6_init(); 871 if (err) 872 goto icmp_fail; 873 err = ip6_mr_init(); 874 if (err) 875 goto ipmr_fail; 876 err = ndisc_init(); 877 if (err) 878 goto ndisc_fail; 879 err = igmp6_init(); 880 if (err) 881 goto igmp_fail; 882 err = ipv6_netfilter_init(); 883 if (err) 884 goto netfilter_fail; 885 /* Create /proc/foo6 entries. */ 886 #ifdef CONFIG_PROC_FS 887 err = -ENOMEM; 888 if (raw6_proc_init()) 889 goto proc_raw6_fail; 890 if (udplite6_proc_init()) 891 goto proc_udplite6_fail; 892 if (ipv6_misc_proc_init()) 893 goto proc_misc6_fail; 894 if (if6_proc_init()) 895 goto proc_if6_fail; 896 #endif 897 err = ip6_route_init(); 898 if (err) 899 goto ip6_route_fail; 900 err = ip6_flowlabel_init(); 901 if (err) 902 goto ip6_flowlabel_fail; 903 err = addrconf_init(); 904 if (err) 905 goto addrconf_fail; 906 907 /* Init v6 extension headers. */ 908 err = ipv6_exthdrs_init(); 909 if (err) 910 goto ipv6_exthdrs_fail; 911 912 err = ipv6_frag_init(); 913 if (err) 914 goto ipv6_frag_fail; 915 916 /* Init v6 transport protocols. */ 917 err = udpv6_init(); 918 if (err) 919 goto udpv6_fail; 920 921 err = udplitev6_init(); 922 if (err) 923 goto udplitev6_fail; 924 925 err = tcpv6_init(); 926 if (err) 927 goto tcpv6_fail; 928 929 err = ipv6_packet_init(); 930 if (err) 931 goto ipv6_packet_fail; 932 933 #ifdef CONFIG_SYSCTL 934 err = ipv6_sysctl_register(); 935 if (err) 936 goto sysctl_fail; 937 #endif 938 out: 939 return err; 940 941 #ifdef CONFIG_SYSCTL 942 sysctl_fail: 943 ipv6_packet_cleanup(); 944 #endif 945 ipv6_packet_fail: 946 tcpv6_exit(); 947 tcpv6_fail: 948 udplitev6_exit(); 949 udplitev6_fail: 950 udpv6_exit(); 951 udpv6_fail: 952 ipv6_frag_exit(); 953 ipv6_frag_fail: 954 ipv6_exthdrs_exit(); 955 ipv6_exthdrs_fail: 956 addrconf_cleanup(); 957 addrconf_fail: 958 ip6_flowlabel_cleanup(); 959 ip6_flowlabel_fail: 960 ip6_route_cleanup(); 961 ip6_route_fail: 962 #ifdef CONFIG_PROC_FS 963 if6_proc_exit(); 964 proc_if6_fail: 965 ipv6_misc_proc_exit(); 966 proc_misc6_fail: 967 udplite6_proc_exit(); 968 proc_udplite6_fail: 969 raw6_proc_exit(); 970 proc_raw6_fail: 971 #endif 972 ipv6_netfilter_fini(); 973 netfilter_fail: 974 igmp6_cleanup(); 975 igmp_fail: 976 ndisc_cleanup(); 977 ndisc_fail: 978 ip6_mr_cleanup(); 979 ipmr_fail: 980 icmpv6_cleanup(); 981 icmp_fail: 982 unregister_pernet_subsys(&inet6_net_ops); 983 register_pernet_fail: 984 sock_unregister(PF_INET6); 985 rtnl_unregister_all(PF_INET6); 986 out_sock_register_fail: 987 rawv6_exit(); 988 out_unregister_raw_proto: 989 proto_unregister(&rawv6_prot); 990 out_unregister_udplite_proto: 991 proto_unregister(&udplitev6_prot); 992 out_unregister_udp_proto: 993 proto_unregister(&udpv6_prot); 994 out_unregister_tcp_proto: 995 proto_unregister(&tcpv6_prot); 996 goto out; 997 } 998 module_init(inet6_init); 999 1000 static void __exit inet6_exit(void) 1001 { 1002 if (disable_ipv6_mod) 1003 return; 1004 1005 /* First of all disallow new sockets creation. */ 1006 sock_unregister(PF_INET6); 1007 /* Disallow any further netlink messages */ 1008 rtnl_unregister_all(PF_INET6); 1009 1010 udpv6_exit(); 1011 udplitev6_exit(); 1012 tcpv6_exit(); 1013 1014 /* Cleanup code parts. */ 1015 ipv6_packet_cleanup(); 1016 ipv6_frag_exit(); 1017 ipv6_exthdrs_exit(); 1018 addrconf_cleanup(); 1019 ip6_flowlabel_cleanup(); 1020 ip6_route_cleanup(); 1021 #ifdef CONFIG_PROC_FS 1022 1023 /* Cleanup code parts. */ 1024 if6_proc_exit(); 1025 ipv6_misc_proc_exit(); 1026 udplite6_proc_exit(); 1027 raw6_proc_exit(); 1028 #endif 1029 ipv6_netfilter_fini(); 1030 igmp6_cleanup(); 1031 ndisc_cleanup(); 1032 ip6_mr_cleanup(); 1033 icmpv6_cleanup(); 1034 rawv6_exit(); 1035 1036 unregister_pernet_subsys(&inet6_net_ops); 1037 proto_unregister(&rawv6_prot); 1038 proto_unregister(&udplitev6_prot); 1039 proto_unregister(&udpv6_prot); 1040 proto_unregister(&tcpv6_prot); 1041 1042 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1043 } 1044 module_exit(inet6_exit); 1045 1046 MODULE_ALIAS_NETPROTO(PF_INET6); 1047