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/ipip.h> 53 #include <net/protocol.h> 54 #include <net/inet_common.h> 55 #include <net/route.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 63 #include <asm/uaccess.h> 64 #include <linux/mroute6.h> 65 66 MODULE_AUTHOR("Cast of dozens"); 67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 68 MODULE_LICENSE("GPL"); 69 70 /* The inetsw6 table contains everything that inet6_create needs to 71 * build a new socket. 72 */ 73 static struct list_head inetsw6[SOCK_MAX]; 74 static DEFINE_SPINLOCK(inetsw6_lock); 75 76 struct ipv6_params ipv6_defaults = { 77 .disable_ipv6 = 0, 78 .autoconf = 1, 79 }; 80 81 static int disable_ipv6_mod; 82 83 module_param_named(disable, disable_ipv6_mod, int, 0444); 84 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 85 86 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 87 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 88 89 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 90 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 91 92 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 93 { 94 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 95 96 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 97 } 98 99 static int inet6_create(struct net *net, struct socket *sock, int protocol, 100 int kern) 101 { 102 struct inet_sock *inet; 103 struct ipv6_pinfo *np; 104 struct sock *sk; 105 struct inet_protosw *answer; 106 struct proto *answer_prot; 107 unsigned char answer_flags; 108 char answer_no_check; 109 int try_loading_module = 0; 110 int err; 111 112 if (sock->type != SOCK_RAW && 113 sock->type != SOCK_DGRAM && 114 !inet_ehash_secret) 115 build_ehash_secret(); 116 117 /* Look for the requested type/protocol pair. */ 118 lookup_protocol: 119 err = -ESOCKTNOSUPPORT; 120 rcu_read_lock(); 121 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 122 123 err = 0; 124 /* Check the non-wild match. */ 125 if (protocol == answer->protocol) { 126 if (protocol != IPPROTO_IP) 127 break; 128 } else { 129 /* Check for the two wild cases. */ 130 if (IPPROTO_IP == protocol) { 131 protocol = answer->protocol; 132 break; 133 } 134 if (IPPROTO_IP == answer->protocol) 135 break; 136 } 137 err = -EPROTONOSUPPORT; 138 } 139 140 if (err) { 141 if (try_loading_module < 2) { 142 rcu_read_unlock(); 143 /* 144 * Be more specific, e.g. net-pf-10-proto-132-type-1 145 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 146 */ 147 if (++try_loading_module == 1) 148 request_module("net-pf-%d-proto-%d-type-%d", 149 PF_INET6, protocol, sock->type); 150 /* 151 * Fall back to generic, e.g. net-pf-10-proto-132 152 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 153 */ 154 else 155 request_module("net-pf-%d-proto-%d", 156 PF_INET6, protocol); 157 goto lookup_protocol; 158 } else 159 goto out_rcu_unlock; 160 } 161 162 err = -EPERM; 163 if (sock->type == SOCK_RAW && !kern && 164 !ns_capable(net->user_ns, CAP_NET_RAW)) 165 goto out_rcu_unlock; 166 167 sock->ops = answer->ops; 168 answer_prot = answer->prot; 169 answer_no_check = answer->no_check; 170 answer_flags = answer->flags; 171 rcu_read_unlock(); 172 173 WARN_ON(answer_prot->slab == NULL); 174 175 err = -ENOBUFS; 176 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 177 if (sk == NULL) 178 goto out; 179 180 sock_init_data(sock, sk); 181 182 err = 0; 183 sk->sk_no_check = answer_no_check; 184 if (INET_PROTOSW_REUSE & answer_flags) 185 sk->sk_reuse = SK_CAN_REUSE; 186 187 inet = inet_sk(sk); 188 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 189 190 if (SOCK_RAW == sock->type) { 191 inet->inet_num = protocol; 192 if (IPPROTO_RAW == protocol) 193 inet->hdrincl = 1; 194 } 195 196 sk->sk_destruct = inet_sock_destruct; 197 sk->sk_family = PF_INET6; 198 sk->sk_protocol = protocol; 199 200 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 201 202 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 203 np->hop_limit = -1; 204 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 205 np->mc_loop = 1; 206 np->pmtudisc = IPV6_PMTUDISC_WANT; 207 np->ipv6only = net->ipv6.sysctl.bindv6only; 208 209 /* Init the ipv4 part of the socket since we can have sockets 210 * using v6 API for ipv4. 211 */ 212 inet->uc_ttl = -1; 213 214 inet->mc_loop = 1; 215 inet->mc_ttl = 1; 216 inet->mc_index = 0; 217 inet->mc_list = NULL; 218 inet->rcv_tos = 0; 219 220 if (ipv4_config.no_pmtu_disc) 221 inet->pmtudisc = IP_PMTUDISC_DONT; 222 else 223 inet->pmtudisc = IP_PMTUDISC_WANT; 224 /* 225 * Increment only the relevant sk_prot->socks debug field, this changes 226 * the previous behaviour of incrementing both the equivalent to 227 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 228 * 229 * This allows better debug granularity as we'll know exactly how many 230 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 231 * transport protocol socks. -acme 232 */ 233 sk_refcnt_debug_inc(sk); 234 235 if (inet->inet_num) { 236 /* It assumes that any protocol which allows 237 * the user to assign a number at socket 238 * creation time automatically shares. 239 */ 240 inet->inet_sport = htons(inet->inet_num); 241 sk->sk_prot->hash(sk); 242 } 243 if (sk->sk_prot->init) { 244 err = sk->sk_prot->init(sk); 245 if (err) { 246 sk_common_release(sk); 247 goto out; 248 } 249 } 250 out: 251 return err; 252 out_rcu_unlock: 253 rcu_read_unlock(); 254 goto out; 255 } 256 257 258 /* bind for INET6 API */ 259 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 260 { 261 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 262 struct sock *sk = sock->sk; 263 struct inet_sock *inet = inet_sk(sk); 264 struct ipv6_pinfo *np = inet6_sk(sk); 265 struct net *net = sock_net(sk); 266 __be32 v4addr = 0; 267 unsigned short snum; 268 int addr_type = 0; 269 int err = 0; 270 271 /* If the socket has its own bind function then use it. */ 272 if (sk->sk_prot->bind) 273 return sk->sk_prot->bind(sk, uaddr, addr_len); 274 275 if (addr_len < SIN6_LEN_RFC2133) 276 return -EINVAL; 277 278 if (addr->sin6_family != AF_INET6) 279 return -EAFNOSUPPORT; 280 281 addr_type = ipv6_addr_type(&addr->sin6_addr); 282 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 283 return -EINVAL; 284 285 snum = ntohs(addr->sin6_port); 286 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 287 return -EACCES; 288 289 lock_sock(sk); 290 291 /* Check these errors (active socket, double bind). */ 292 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 293 err = -EINVAL; 294 goto out; 295 } 296 297 /* Check if the address belongs to the host. */ 298 if (addr_type == IPV6_ADDR_MAPPED) { 299 int chk_addr_ret; 300 301 /* Binding to v4-mapped address on a v6-only socket 302 * makes no sense 303 */ 304 if (np->ipv6only) { 305 err = -EINVAL; 306 goto out; 307 } 308 309 /* Reproduce AF_INET checks to make the bindings consistent */ 310 v4addr = addr->sin6_addr.s6_addr32[3]; 311 chk_addr_ret = inet_addr_type(net, v4addr); 312 if (!sysctl_ip_nonlocal_bind && 313 !(inet->freebind || inet->transparent) && 314 v4addr != htonl(INADDR_ANY) && 315 chk_addr_ret != RTN_LOCAL && 316 chk_addr_ret != RTN_MULTICAST && 317 chk_addr_ret != RTN_BROADCAST) { 318 err = -EADDRNOTAVAIL; 319 goto out; 320 } 321 } else { 322 if (addr_type != IPV6_ADDR_ANY) { 323 struct net_device *dev = NULL; 324 325 rcu_read_lock(); 326 if (addr_type & IPV6_ADDR_LINKLOCAL) { 327 if (addr_len >= sizeof(struct sockaddr_in6) && 328 addr->sin6_scope_id) { 329 /* Override any existing binding, if another one 330 * is supplied by user. 331 */ 332 sk->sk_bound_dev_if = addr->sin6_scope_id; 333 } 334 335 /* Binding to link-local address requires an interface */ 336 if (!sk->sk_bound_dev_if) { 337 err = -EINVAL; 338 goto out_unlock; 339 } 340 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 341 if (!dev) { 342 err = -ENODEV; 343 goto out_unlock; 344 } 345 } 346 347 /* ipv4 addr of the socket is invalid. Only the 348 * unspecified and mapped address have a v4 equivalent. 349 */ 350 v4addr = LOOPBACK4_IPV6; 351 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 352 if (!(inet->freebind || inet->transparent) && 353 !ipv6_chk_addr(net, &addr->sin6_addr, 354 dev, 0)) { 355 err = -EADDRNOTAVAIL; 356 goto out_unlock; 357 } 358 } 359 rcu_read_unlock(); 360 } 361 } 362 363 inet->inet_rcv_saddr = v4addr; 364 inet->inet_saddr = v4addr; 365 366 np->rcv_saddr = addr->sin6_addr; 367 368 if (!(addr_type & IPV6_ADDR_MULTICAST)) 369 np->saddr = addr->sin6_addr; 370 371 /* Make sure we are allowed to bind here. */ 372 if (sk->sk_prot->get_port(sk, snum)) { 373 inet_reset_saddr(sk); 374 err = -EADDRINUSE; 375 goto out; 376 } 377 378 if (addr_type != IPV6_ADDR_ANY) { 379 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 380 if (addr_type != IPV6_ADDR_MAPPED) 381 np->ipv6only = 1; 382 } 383 if (snum) 384 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 385 inet->inet_sport = htons(inet->inet_num); 386 inet->inet_dport = 0; 387 inet->inet_daddr = 0; 388 out: 389 release_sock(sk); 390 return err; 391 out_unlock: 392 rcu_read_unlock(); 393 goto out; 394 } 395 EXPORT_SYMBOL(inet6_bind); 396 397 int inet6_release(struct socket *sock) 398 { 399 struct sock *sk = sock->sk; 400 401 if (sk == NULL) 402 return -EINVAL; 403 404 /* Free mc lists */ 405 ipv6_sock_mc_close(sk); 406 407 /* Free ac lists */ 408 ipv6_sock_ac_close(sk); 409 410 return inet_release(sock); 411 } 412 EXPORT_SYMBOL(inet6_release); 413 414 void inet6_destroy_sock(struct sock *sk) 415 { 416 struct ipv6_pinfo *np = inet6_sk(sk); 417 struct sk_buff *skb; 418 struct ipv6_txoptions *opt; 419 420 /* Release rx options */ 421 422 skb = xchg(&np->pktoptions, NULL); 423 if (skb != NULL) 424 kfree_skb(skb); 425 426 skb = xchg(&np->rxpmtu, NULL); 427 if (skb != NULL) 428 kfree_skb(skb); 429 430 /* Free flowlabels */ 431 fl6_free_socklist(sk); 432 433 /* Free tx options */ 434 435 opt = xchg(&np->opt, NULL); 436 if (opt != NULL) 437 sock_kfree_s(sk, opt, opt->tot_len); 438 } 439 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 440 441 /* 442 * This does both peername and sockname. 443 */ 444 445 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 446 int *uaddr_len, int peer) 447 { 448 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 449 struct sock *sk = sock->sk; 450 struct inet_sock *inet = inet_sk(sk); 451 struct ipv6_pinfo *np = inet6_sk(sk); 452 453 sin->sin6_family = AF_INET6; 454 sin->sin6_flowinfo = 0; 455 sin->sin6_scope_id = 0; 456 if (peer) { 457 if (!inet->inet_dport) 458 return -ENOTCONN; 459 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 460 peer == 1) 461 return -ENOTCONN; 462 sin->sin6_port = inet->inet_dport; 463 sin->sin6_addr = np->daddr; 464 if (np->sndflow) 465 sin->sin6_flowinfo = np->flow_label; 466 } else { 467 if (ipv6_addr_any(&np->rcv_saddr)) 468 sin->sin6_addr = np->saddr; 469 else 470 sin->sin6_addr = np->rcv_saddr; 471 472 sin->sin6_port = inet->inet_sport; 473 } 474 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 475 sin->sin6_scope_id = sk->sk_bound_dev_if; 476 *uaddr_len = sizeof(*sin); 477 return 0; 478 } 479 EXPORT_SYMBOL(inet6_getname); 480 481 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 482 { 483 struct sock *sk = sock->sk; 484 struct net *net = sock_net(sk); 485 486 switch (cmd) { 487 case SIOCGSTAMP: 488 return sock_get_timestamp(sk, (struct timeval __user *)arg); 489 490 case SIOCGSTAMPNS: 491 return sock_get_timestampns(sk, (struct timespec __user *)arg); 492 493 case SIOCADDRT: 494 case SIOCDELRT: 495 496 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 497 498 case SIOCSIFADDR: 499 return addrconf_add_ifaddr(net, (void __user *) arg); 500 case SIOCDIFADDR: 501 return addrconf_del_ifaddr(net, (void __user *) arg); 502 case SIOCSIFDSTADDR: 503 return addrconf_set_dstaddr(net, (void __user *) arg); 504 default: 505 if (!sk->sk_prot->ioctl) 506 return -ENOIOCTLCMD; 507 return sk->sk_prot->ioctl(sk, cmd, arg); 508 } 509 /*NOTREACHED*/ 510 return 0; 511 } 512 EXPORT_SYMBOL(inet6_ioctl); 513 514 const struct proto_ops inet6_stream_ops = { 515 .family = PF_INET6, 516 .owner = THIS_MODULE, 517 .release = inet6_release, 518 .bind = inet6_bind, 519 .connect = inet_stream_connect, /* ok */ 520 .socketpair = sock_no_socketpair, /* a do nothing */ 521 .accept = inet_accept, /* ok */ 522 .getname = inet6_getname, 523 .poll = tcp_poll, /* ok */ 524 .ioctl = inet6_ioctl, /* must change */ 525 .listen = inet_listen, /* ok */ 526 .shutdown = inet_shutdown, /* ok */ 527 .setsockopt = sock_common_setsockopt, /* ok */ 528 .getsockopt = sock_common_getsockopt, /* ok */ 529 .sendmsg = inet_sendmsg, /* ok */ 530 .recvmsg = inet_recvmsg, /* ok */ 531 .mmap = sock_no_mmap, 532 .sendpage = inet_sendpage, 533 .splice_read = tcp_splice_read, 534 #ifdef CONFIG_COMPAT 535 .compat_setsockopt = compat_sock_common_setsockopt, 536 .compat_getsockopt = compat_sock_common_getsockopt, 537 #endif 538 }; 539 540 const struct proto_ops inet6_dgram_ops = { 541 .family = PF_INET6, 542 .owner = THIS_MODULE, 543 .release = inet6_release, 544 .bind = inet6_bind, 545 .connect = inet_dgram_connect, /* ok */ 546 .socketpair = sock_no_socketpair, /* a do nothing */ 547 .accept = sock_no_accept, /* a do nothing */ 548 .getname = inet6_getname, 549 .poll = udp_poll, /* ok */ 550 .ioctl = inet6_ioctl, /* must change */ 551 .listen = sock_no_listen, /* ok */ 552 .shutdown = inet_shutdown, /* ok */ 553 .setsockopt = sock_common_setsockopt, /* ok */ 554 .getsockopt = sock_common_getsockopt, /* ok */ 555 .sendmsg = inet_sendmsg, /* ok */ 556 .recvmsg = inet_recvmsg, /* ok */ 557 .mmap = sock_no_mmap, 558 .sendpage = sock_no_sendpage, 559 #ifdef CONFIG_COMPAT 560 .compat_setsockopt = compat_sock_common_setsockopt, 561 .compat_getsockopt = compat_sock_common_getsockopt, 562 #endif 563 }; 564 565 static const struct net_proto_family inet6_family_ops = { 566 .family = PF_INET6, 567 .create = inet6_create, 568 .owner = THIS_MODULE, 569 }; 570 571 int inet6_register_protosw(struct inet_protosw *p) 572 { 573 struct list_head *lh; 574 struct inet_protosw *answer; 575 struct list_head *last_perm; 576 int protocol = p->protocol; 577 int ret; 578 579 spin_lock_bh(&inetsw6_lock); 580 581 ret = -EINVAL; 582 if (p->type >= SOCK_MAX) 583 goto out_illegal; 584 585 /* If we are trying to override a permanent protocol, bail. */ 586 answer = NULL; 587 ret = -EPERM; 588 last_perm = &inetsw6[p->type]; 589 list_for_each(lh, &inetsw6[p->type]) { 590 answer = list_entry(lh, struct inet_protosw, list); 591 592 /* Check only the non-wild match. */ 593 if (INET_PROTOSW_PERMANENT & answer->flags) { 594 if (protocol == answer->protocol) 595 break; 596 last_perm = lh; 597 } 598 599 answer = NULL; 600 } 601 if (answer) 602 goto out_permanent; 603 604 /* Add the new entry after the last permanent entry if any, so that 605 * the new entry does not override a permanent entry when matched with 606 * a wild-card protocol. But it is allowed to override any existing 607 * non-permanent entry. This means that when we remove this entry, the 608 * system automatically returns to the old behavior. 609 */ 610 list_add_rcu(&p->list, last_perm); 611 ret = 0; 612 out: 613 spin_unlock_bh(&inetsw6_lock); 614 return ret; 615 616 out_permanent: 617 pr_err("Attempt to override permanent protocol %d\n", protocol); 618 goto out; 619 620 out_illegal: 621 pr_err("Ignoring attempt to register invalid socket type %d\n", 622 p->type); 623 goto out; 624 } 625 EXPORT_SYMBOL(inet6_register_protosw); 626 627 void 628 inet6_unregister_protosw(struct inet_protosw *p) 629 { 630 if (INET_PROTOSW_PERMANENT & p->flags) { 631 pr_err("Attempt to unregister permanent protocol %d\n", 632 p->protocol); 633 } else { 634 spin_lock_bh(&inetsw6_lock); 635 list_del_rcu(&p->list); 636 spin_unlock_bh(&inetsw6_lock); 637 638 synchronize_net(); 639 } 640 } 641 EXPORT_SYMBOL(inet6_unregister_protosw); 642 643 int inet6_sk_rebuild_header(struct sock *sk) 644 { 645 struct ipv6_pinfo *np = inet6_sk(sk); 646 struct dst_entry *dst; 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, final; 653 struct flowi6 fl6; 654 655 memset(&fl6, 0, sizeof(fl6)); 656 fl6.flowi6_proto = sk->sk_protocol; 657 fl6.daddr = np->daddr; 658 fl6.saddr = np->saddr; 659 fl6.flowlabel = np->flow_label; 660 fl6.flowi6_oif = sk->sk_bound_dev_if; 661 fl6.flowi6_mark = sk->sk_mark; 662 fl6.fl6_dport = inet->inet_dport; 663 fl6.fl6_sport = inet->inet_sport; 664 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 665 666 final_p = fl6_update_dst(&fl6, np->opt, &final); 667 668 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); 669 if (IS_ERR(dst)) { 670 sk->sk_route_caps = 0; 671 sk->sk_err_soft = -PTR_ERR(dst); 672 return PTR_ERR(dst); 673 } 674 675 __ip6_dst_store(sk, dst, NULL, NULL); 676 } 677 678 return 0; 679 } 680 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 681 682 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb) 683 { 684 const struct ipv6_pinfo *np = inet6_sk(sk); 685 const struct inet6_skb_parm *opt = IP6CB(skb); 686 687 if (np->rxopt.all) { 688 if ((opt->hop && (np->rxopt.bits.hopopts || 689 np->rxopt.bits.ohopopts)) || 690 ((IPV6_FLOWINFO_MASK & 691 *(__be32 *)skb_network_header(skb)) && 692 np->rxopt.bits.rxflow) || 693 (opt->srcrt && (np->rxopt.bits.srcrt || 694 np->rxopt.bits.osrcrt)) || 695 ((opt->dst1 || opt->dst0) && 696 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 697 return true; 698 } 699 return false; 700 } 701 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 702 703 static struct packet_type ipv6_packet_type __read_mostly = { 704 .type = cpu_to_be16(ETH_P_IPV6), 705 .func = ipv6_rcv, 706 }; 707 708 static int __init ipv6_packet_init(void) 709 { 710 dev_add_pack(&ipv6_packet_type); 711 return 0; 712 } 713 714 static void ipv6_packet_cleanup(void) 715 { 716 dev_remove_pack(&ipv6_packet_type); 717 } 718 719 static int __net_init ipv6_init_mibs(struct net *net) 720 { 721 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6, 722 sizeof(struct udp_mib), 723 __alignof__(struct udp_mib)) < 0) 724 return -ENOMEM; 725 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6, 726 sizeof(struct udp_mib), 727 __alignof__(struct udp_mib)) < 0) 728 goto err_udplite_mib; 729 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics, 730 sizeof(struct ipstats_mib), 731 __alignof__(struct ipstats_mib)) < 0) 732 goto err_ip_mib; 733 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics, 734 sizeof(struct icmpv6_mib), 735 __alignof__(struct icmpv6_mib)) < 0) 736 goto err_icmp_mib; 737 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 738 GFP_KERNEL); 739 if (!net->mib.icmpv6msg_statistics) 740 goto err_icmpmsg_mib; 741 return 0; 742 743 err_icmpmsg_mib: 744 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 745 err_icmp_mib: 746 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 747 err_ip_mib: 748 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 749 err_udplite_mib: 750 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 751 return -ENOMEM; 752 } 753 754 static void ipv6_cleanup_mibs(struct net *net) 755 { 756 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 757 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 758 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 759 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 760 kfree(net->mib.icmpv6msg_statistics); 761 } 762 763 static int __net_init inet6_net_init(struct net *net) 764 { 765 int err = 0; 766 767 net->ipv6.sysctl.bindv6only = 0; 768 net->ipv6.sysctl.icmpv6_time = 1*HZ; 769 770 err = ipv6_init_mibs(net); 771 if (err) 772 return err; 773 #ifdef CONFIG_PROC_FS 774 err = udp6_proc_init(net); 775 if (err) 776 goto out; 777 err = tcp6_proc_init(net); 778 if (err) 779 goto proc_tcp6_fail; 780 err = ac6_proc_init(net); 781 if (err) 782 goto proc_ac6_fail; 783 #endif 784 return err; 785 786 #ifdef CONFIG_PROC_FS 787 proc_ac6_fail: 788 tcp6_proc_exit(net); 789 proc_tcp6_fail: 790 udp6_proc_exit(net); 791 out: 792 ipv6_cleanup_mibs(net); 793 return err; 794 #endif 795 } 796 797 static void __net_exit inet6_net_exit(struct net *net) 798 { 799 #ifdef CONFIG_PROC_FS 800 udp6_proc_exit(net); 801 tcp6_proc_exit(net); 802 ac6_proc_exit(net); 803 #endif 804 ipv6_cleanup_mibs(net); 805 } 806 807 static struct pernet_operations inet6_net_ops = { 808 .init = inet6_net_init, 809 .exit = inet6_net_exit, 810 }; 811 812 static int __init inet6_init(void) 813 { 814 struct sk_buff *dummy_skb; 815 struct list_head *r; 816 int err = 0; 817 818 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 819 820 /* Register the socket-side information for inet6_create. */ 821 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 822 INIT_LIST_HEAD(r); 823 824 if (disable_ipv6_mod) { 825 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 826 goto out; 827 } 828 829 err = proto_register(&tcpv6_prot, 1); 830 if (err) 831 goto out; 832 833 err = proto_register(&udpv6_prot, 1); 834 if (err) 835 goto out_unregister_tcp_proto; 836 837 err = proto_register(&udplitev6_prot, 1); 838 if (err) 839 goto out_unregister_udp_proto; 840 841 err = proto_register(&rawv6_prot, 1); 842 if (err) 843 goto out_unregister_udplite_proto; 844 845 846 /* We MUST register RAW sockets before we create the ICMP6, 847 * IGMP6, or NDISC control sockets. 848 */ 849 err = rawv6_init(); 850 if (err) 851 goto out_unregister_raw_proto; 852 853 /* Register the family here so that the init calls below will 854 * be able to create sockets. (?? is this dangerous ??) 855 */ 856 err = sock_register(&inet6_family_ops); 857 if (err) 858 goto out_sock_register_fail; 859 860 tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 861 862 /* 863 * ipngwg API draft makes clear that the correct semantics 864 * for TCP and UDP is to consider one TCP and UDP instance 865 * in a host available by both INET and INET6 APIs and 866 * able to communicate via both network protocols. 867 */ 868 869 err = register_pernet_subsys(&inet6_net_ops); 870 if (err) 871 goto register_pernet_fail; 872 err = icmpv6_init(); 873 if (err) 874 goto icmp_fail; 875 err = ip6_mr_init(); 876 if (err) 877 goto ipmr_fail; 878 err = ndisc_init(); 879 if (err) 880 goto ndisc_fail; 881 err = igmp6_init(); 882 if (err) 883 goto igmp_fail; 884 err = ipv6_netfilter_init(); 885 if (err) 886 goto netfilter_fail; 887 /* Create /proc/foo6 entries. */ 888 #ifdef CONFIG_PROC_FS 889 err = -ENOMEM; 890 if (raw6_proc_init()) 891 goto proc_raw6_fail; 892 if (udplite6_proc_init()) 893 goto proc_udplite6_fail; 894 if (ipv6_misc_proc_init()) 895 goto proc_misc6_fail; 896 if (if6_proc_init()) 897 goto proc_if6_fail; 898 #endif 899 err = ip6_route_init(); 900 if (err) 901 goto ip6_route_fail; 902 err = ip6_flowlabel_init(); 903 if (err) 904 goto ip6_flowlabel_fail; 905 err = addrconf_init(); 906 if (err) 907 goto addrconf_fail; 908 909 /* Init v6 extension headers. */ 910 err = ipv6_exthdrs_init(); 911 if (err) 912 goto ipv6_exthdrs_fail; 913 914 err = ipv6_frag_init(); 915 if (err) 916 goto ipv6_frag_fail; 917 918 /* Init v6 transport protocols. */ 919 err = udpv6_init(); 920 if (err) 921 goto udpv6_fail; 922 923 err = udplitev6_init(); 924 if (err) 925 goto udplitev6_fail; 926 927 err = tcpv6_init(); 928 if (err) 929 goto tcpv6_fail; 930 931 err = ipv6_packet_init(); 932 if (err) 933 goto ipv6_packet_fail; 934 935 #ifdef CONFIG_SYSCTL 936 err = ipv6_sysctl_register(); 937 if (err) 938 goto sysctl_fail; 939 #endif 940 out: 941 return err; 942 943 #ifdef CONFIG_SYSCTL 944 sysctl_fail: 945 ipv6_packet_cleanup(); 946 #endif 947 ipv6_packet_fail: 948 tcpv6_exit(); 949 tcpv6_fail: 950 udplitev6_exit(); 951 udplitev6_fail: 952 udpv6_exit(); 953 udpv6_fail: 954 ipv6_frag_exit(); 955 ipv6_frag_fail: 956 ipv6_exthdrs_exit(); 957 ipv6_exthdrs_fail: 958 addrconf_cleanup(); 959 addrconf_fail: 960 ip6_flowlabel_cleanup(); 961 ip6_flowlabel_fail: 962 ip6_route_cleanup(); 963 ip6_route_fail: 964 #ifdef CONFIG_PROC_FS 965 if6_proc_exit(); 966 proc_if6_fail: 967 ipv6_misc_proc_exit(); 968 proc_misc6_fail: 969 udplite6_proc_exit(); 970 proc_udplite6_fail: 971 raw6_proc_exit(); 972 proc_raw6_fail: 973 #endif 974 ipv6_netfilter_fini(); 975 netfilter_fail: 976 igmp6_cleanup(); 977 igmp_fail: 978 ndisc_cleanup(); 979 ndisc_fail: 980 ip6_mr_cleanup(); 981 ipmr_fail: 982 icmpv6_cleanup(); 983 icmp_fail: 984 unregister_pernet_subsys(&inet6_net_ops); 985 register_pernet_fail: 986 sock_unregister(PF_INET6); 987 rtnl_unregister_all(PF_INET6); 988 out_sock_register_fail: 989 rawv6_exit(); 990 out_unregister_raw_proto: 991 proto_unregister(&rawv6_prot); 992 out_unregister_udplite_proto: 993 proto_unregister(&udplitev6_prot); 994 out_unregister_udp_proto: 995 proto_unregister(&udpv6_prot); 996 out_unregister_tcp_proto: 997 proto_unregister(&tcpv6_prot); 998 goto out; 999 } 1000 module_init(inet6_init); 1001 1002 static void __exit inet6_exit(void) 1003 { 1004 if (disable_ipv6_mod) 1005 return; 1006 1007 /* First of all disallow new sockets creation. */ 1008 sock_unregister(PF_INET6); 1009 /* Disallow any further netlink messages */ 1010 rtnl_unregister_all(PF_INET6); 1011 1012 udpv6_exit(); 1013 udplitev6_exit(); 1014 tcpv6_exit(); 1015 1016 /* Cleanup code parts. */ 1017 ipv6_packet_cleanup(); 1018 ipv6_frag_exit(); 1019 ipv6_exthdrs_exit(); 1020 addrconf_cleanup(); 1021 ip6_flowlabel_cleanup(); 1022 ip6_route_cleanup(); 1023 #ifdef CONFIG_PROC_FS 1024 1025 /* Cleanup code parts. */ 1026 if6_proc_exit(); 1027 ipv6_misc_proc_exit(); 1028 udplite6_proc_exit(); 1029 raw6_proc_exit(); 1030 #endif 1031 ipv6_netfilter_fini(); 1032 igmp6_cleanup(); 1033 ndisc_cleanup(); 1034 ip6_mr_cleanup(); 1035 icmpv6_cleanup(); 1036 rawv6_exit(); 1037 1038 unregister_pernet_subsys(&inet6_net_ops); 1039 proto_unregister(&rawv6_prot); 1040 proto_unregister(&udplitev6_prot); 1041 proto_unregister(&udpv6_prot); 1042 proto_unregister(&tcpv6_prot); 1043 1044 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1045 } 1046 module_exit(inet6_exit); 1047 1048 MODULE_ALIAS_NETPROTO(PF_INET6); 1049