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/ping.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 #include <net/ndisc.h> 60 #ifdef CONFIG_IPV6_TUNNEL 61 #include <net/ip6_tunnel.h> 62 #endif 63 64 #include <asm/uaccess.h> 65 #include <linux/mroute6.h> 66 67 MODULE_AUTHOR("Cast of dozens"); 68 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 69 MODULE_LICENSE("GPL"); 70 71 /* The inetsw6 table contains everything that inet6_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 struct ipv6_params ipv6_defaults = { 78 .disable_ipv6 = 0, 79 .autoconf = 1, 80 }; 81 82 static int disable_ipv6_mod; 83 84 module_param_named(disable, disable_ipv6_mod, int, 0444); 85 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 86 87 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 88 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 89 90 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 91 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 92 93 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 94 { 95 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 96 97 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 98 } 99 100 static int inet6_create(struct net *net, struct socket *sock, int protocol, 101 int kern) 102 { 103 struct inet_sock *inet; 104 struct ipv6_pinfo *np; 105 struct sock *sk; 106 struct inet_protosw *answer; 107 struct proto *answer_prot; 108 unsigned char answer_flags; 109 char answer_no_check; 110 int try_loading_module = 0; 111 int err; 112 113 if (sock->type != SOCK_RAW && 114 sock->type != SOCK_DGRAM && 115 !inet_ehash_secret) 116 build_ehash_secret(); 117 118 /* Look for the requested type/protocol pair. */ 119 lookup_protocol: 120 err = -ESOCKTNOSUPPORT; 121 rcu_read_lock(); 122 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 123 124 err = 0; 125 /* Check the non-wild match. */ 126 if (protocol == answer->protocol) { 127 if (protocol != IPPROTO_IP) 128 break; 129 } else { 130 /* Check for the two wild cases. */ 131 if (IPPROTO_IP == protocol) { 132 protocol = answer->protocol; 133 break; 134 } 135 if (IPPROTO_IP == answer->protocol) 136 break; 137 } 138 err = -EPROTONOSUPPORT; 139 } 140 141 if (err) { 142 if (try_loading_module < 2) { 143 rcu_read_unlock(); 144 /* 145 * Be more specific, e.g. net-pf-10-proto-132-type-1 146 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 147 */ 148 if (++try_loading_module == 1) 149 request_module("net-pf-%d-proto-%d-type-%d", 150 PF_INET6, protocol, sock->type); 151 /* 152 * Fall back to generic, e.g. net-pf-10-proto-132 153 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 154 */ 155 else 156 request_module("net-pf-%d-proto-%d", 157 PF_INET6, protocol); 158 goto lookup_protocol; 159 } else 160 goto out_rcu_unlock; 161 } 162 163 err = -EPERM; 164 if (sock->type == SOCK_RAW && !kern && 165 !ns_capable(net->user_ns, CAP_NET_RAW)) 166 goto out_rcu_unlock; 167 168 sock->ops = answer->ops; 169 answer_prot = answer->prot; 170 answer_no_check = answer->no_check; 171 answer_flags = answer->flags; 172 rcu_read_unlock(); 173 174 WARN_ON(answer_prot->slab == NULL); 175 176 err = -ENOBUFS; 177 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 178 if (sk == NULL) 179 goto out; 180 181 sock_init_data(sock, sk); 182 183 err = 0; 184 sk->sk_no_check = answer_no_check; 185 if (INET_PROTOSW_REUSE & answer_flags) 186 sk->sk_reuse = SK_CAN_REUSE; 187 188 inet = inet_sk(sk); 189 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 190 191 if (SOCK_RAW == sock->type) { 192 inet->inet_num = protocol; 193 if (IPPROTO_RAW == protocol) 194 inet->hdrincl = 1; 195 } 196 197 sk->sk_destruct = inet_sock_destruct; 198 sk->sk_family = PF_INET6; 199 sk->sk_protocol = protocol; 200 201 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 202 203 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 204 np->hop_limit = -1; 205 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 206 np->mc_loop = 1; 207 np->pmtudisc = IPV6_PMTUDISC_WANT; 208 np->ipv6only = net->ipv6.sysctl.bindv6only; 209 210 /* Init the ipv4 part of the socket since we can have sockets 211 * using v6 API for ipv4. 212 */ 213 inet->uc_ttl = -1; 214 215 inet->mc_loop = 1; 216 inet->mc_ttl = 1; 217 inet->mc_index = 0; 218 inet->mc_list = NULL; 219 inet->rcv_tos = 0; 220 221 if (ipv4_config.no_pmtu_disc) 222 inet->pmtudisc = IP_PMTUDISC_DONT; 223 else 224 inet->pmtudisc = IP_PMTUDISC_WANT; 225 /* 226 * Increment only the relevant sk_prot->socks debug field, this changes 227 * the previous behaviour of incrementing both the equivalent to 228 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 229 * 230 * This allows better debug granularity as we'll know exactly how many 231 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 232 * transport protocol socks. -acme 233 */ 234 sk_refcnt_debug_inc(sk); 235 236 if (inet->inet_num) { 237 /* It assumes that any protocol which allows 238 * the user to assign a number at socket 239 * creation time automatically shares. 240 */ 241 inet->inet_sport = htons(inet->inet_num); 242 sk->sk_prot->hash(sk); 243 } 244 if (sk->sk_prot->init) { 245 err = sk->sk_prot->init(sk); 246 if (err) { 247 sk_common_release(sk); 248 goto out; 249 } 250 } 251 out: 252 return err; 253 out_rcu_unlock: 254 rcu_read_unlock(); 255 goto out; 256 } 257 258 259 /* bind for INET6 API */ 260 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 261 { 262 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 263 struct sock *sk = sock->sk; 264 struct inet_sock *inet = inet_sk(sk); 265 struct ipv6_pinfo *np = inet6_sk(sk); 266 struct net *net = sock_net(sk); 267 __be32 v4addr = 0; 268 unsigned short snum; 269 int addr_type = 0; 270 int err = 0; 271 272 /* If the socket has its own bind function then use it. */ 273 if (sk->sk_prot->bind) 274 return sk->sk_prot->bind(sk, uaddr, addr_len); 275 276 if (addr_len < SIN6_LEN_RFC2133) 277 return -EINVAL; 278 279 if (addr->sin6_family != AF_INET6) 280 return -EAFNOSUPPORT; 281 282 addr_type = ipv6_addr_type(&addr->sin6_addr); 283 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 284 return -EINVAL; 285 286 snum = ntohs(addr->sin6_port); 287 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 288 return -EACCES; 289 290 lock_sock(sk); 291 292 /* Check these errors (active socket, double bind). */ 293 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 294 err = -EINVAL; 295 goto out; 296 } 297 298 /* Check if the address belongs to the host. */ 299 if (addr_type == IPV6_ADDR_MAPPED) { 300 int chk_addr_ret; 301 302 /* Binding to v4-mapped address on a v6-only socket 303 * makes no sense 304 */ 305 if (np->ipv6only) { 306 err = -EINVAL; 307 goto out; 308 } 309 310 /* Reproduce AF_INET checks to make the bindings consistent */ 311 v4addr = addr->sin6_addr.s6_addr32[3]; 312 chk_addr_ret = inet_addr_type(net, v4addr); 313 if (!sysctl_ip_nonlocal_bind && 314 !(inet->freebind || inet->transparent) && 315 v4addr != htonl(INADDR_ANY) && 316 chk_addr_ret != RTN_LOCAL && 317 chk_addr_ret != RTN_MULTICAST && 318 chk_addr_ret != RTN_BROADCAST) { 319 err = -EADDRNOTAVAIL; 320 goto out; 321 } 322 } else { 323 if (addr_type != IPV6_ADDR_ANY) { 324 struct net_device *dev = NULL; 325 326 rcu_read_lock(); 327 if (__ipv6_addr_needs_scope_id(addr_type)) { 328 if (addr_len >= sizeof(struct sockaddr_in6) && 329 addr->sin6_scope_id) { 330 /* Override any existing binding, if another one 331 * is supplied by user. 332 */ 333 sk->sk_bound_dev_if = addr->sin6_scope_id; 334 } 335 336 /* Binding to link-local address requires an interface */ 337 if (!sk->sk_bound_dev_if) { 338 err = -EINVAL; 339 goto out_unlock; 340 } 341 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 342 if (!dev) { 343 err = -ENODEV; 344 goto out_unlock; 345 } 346 } 347 348 /* ipv4 addr of the socket is invalid. Only the 349 * unspecified and mapped address have a v4 equivalent. 350 */ 351 v4addr = LOOPBACK4_IPV6; 352 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 353 if (!(inet->freebind || inet->transparent) && 354 !ipv6_chk_addr(net, &addr->sin6_addr, 355 dev, 0)) { 356 err = -EADDRNOTAVAIL; 357 goto out_unlock; 358 } 359 } 360 rcu_read_unlock(); 361 } 362 } 363 364 inet->inet_rcv_saddr = v4addr; 365 inet->inet_saddr = v4addr; 366 367 np->rcv_saddr = addr->sin6_addr; 368 369 if (!(addr_type & IPV6_ADDR_MULTICAST)) 370 np->saddr = addr->sin6_addr; 371 372 /* Make sure we are allowed to bind here. */ 373 if (sk->sk_prot->get_port(sk, snum)) { 374 inet_reset_saddr(sk); 375 err = -EADDRINUSE; 376 goto out; 377 } 378 379 if (addr_type != IPV6_ADDR_ANY) { 380 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 381 if (addr_type != IPV6_ADDR_MAPPED) 382 np->ipv6only = 1; 383 } 384 if (snum) 385 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 386 inet->inet_sport = htons(inet->inet_num); 387 inet->inet_dport = 0; 388 inet->inet_daddr = 0; 389 out: 390 release_sock(sk); 391 return err; 392 out_unlock: 393 rcu_read_unlock(); 394 goto out; 395 } 396 EXPORT_SYMBOL(inet6_bind); 397 398 int inet6_release(struct socket *sock) 399 { 400 struct sock *sk = sock->sk; 401 402 if (sk == NULL) 403 return -EINVAL; 404 405 /* Free mc lists */ 406 ipv6_sock_mc_close(sk); 407 408 /* Free ac lists */ 409 ipv6_sock_ac_close(sk); 410 411 return inet_release(sock); 412 } 413 EXPORT_SYMBOL(inet6_release); 414 415 void inet6_destroy_sock(struct sock *sk) 416 { 417 struct ipv6_pinfo *np = inet6_sk(sk); 418 struct sk_buff *skb; 419 struct ipv6_txoptions *opt; 420 421 /* Release rx options */ 422 423 skb = xchg(&np->pktoptions, NULL); 424 if (skb != NULL) 425 kfree_skb(skb); 426 427 skb = xchg(&np->rxpmtu, NULL); 428 if (skb != NULL) 429 kfree_skb(skb); 430 431 /* Free flowlabels */ 432 fl6_free_socklist(sk); 433 434 /* Free tx options */ 435 436 opt = xchg(&np->opt, NULL); 437 if (opt != NULL) 438 sock_kfree_s(sk, opt, opt->tot_len); 439 } 440 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 441 442 /* 443 * This does both peername and sockname. 444 */ 445 446 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 447 int *uaddr_len, int peer) 448 { 449 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 450 struct sock *sk = sock->sk; 451 struct inet_sock *inet = inet_sk(sk); 452 struct ipv6_pinfo *np = inet6_sk(sk); 453 454 sin->sin6_family = AF_INET6; 455 sin->sin6_flowinfo = 0; 456 sin->sin6_scope_id = 0; 457 if (peer) { 458 if (!inet->inet_dport) 459 return -ENOTCONN; 460 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 461 peer == 1) 462 return -ENOTCONN; 463 sin->sin6_port = inet->inet_dport; 464 sin->sin6_addr = np->daddr; 465 if (np->sndflow) 466 sin->sin6_flowinfo = np->flow_label; 467 } else { 468 if (ipv6_addr_any(&np->rcv_saddr)) 469 sin->sin6_addr = np->saddr; 470 else 471 sin->sin6_addr = np->rcv_saddr; 472 473 sin->sin6_port = inet->inet_sport; 474 } 475 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 476 sk->sk_bound_dev_if); 477 *uaddr_len = sizeof(*sin); 478 return 0; 479 } 480 EXPORT_SYMBOL(inet6_getname); 481 482 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 483 { 484 struct sock *sk = sock->sk; 485 struct net *net = sock_net(sk); 486 487 switch (cmd) { 488 case SIOCGSTAMP: 489 return sock_get_timestamp(sk, (struct timeval __user *)arg); 490 491 case SIOCGSTAMPNS: 492 return sock_get_timestampns(sk, (struct timespec __user *)arg); 493 494 case SIOCADDRT: 495 case SIOCDELRT: 496 497 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 498 499 case SIOCSIFADDR: 500 return addrconf_add_ifaddr(net, (void __user *) arg); 501 case SIOCDIFADDR: 502 return addrconf_del_ifaddr(net, (void __user *) arg); 503 case SIOCSIFDSTADDR: 504 return addrconf_set_dstaddr(net, (void __user *) arg); 505 default: 506 if (!sk->sk_prot->ioctl) 507 return -ENOIOCTLCMD; 508 return sk->sk_prot->ioctl(sk, cmd, arg); 509 } 510 /*NOTREACHED*/ 511 return 0; 512 } 513 EXPORT_SYMBOL(inet6_ioctl); 514 515 const struct proto_ops inet6_stream_ops = { 516 .family = PF_INET6, 517 .owner = THIS_MODULE, 518 .release = inet6_release, 519 .bind = inet6_bind, 520 .connect = inet_stream_connect, /* ok */ 521 .socketpair = sock_no_socketpair, /* a do nothing */ 522 .accept = inet_accept, /* ok */ 523 .getname = inet6_getname, 524 .poll = tcp_poll, /* ok */ 525 .ioctl = inet6_ioctl, /* must change */ 526 .listen = inet_listen, /* ok */ 527 .shutdown = inet_shutdown, /* ok */ 528 .setsockopt = sock_common_setsockopt, /* ok */ 529 .getsockopt = sock_common_getsockopt, /* ok */ 530 .sendmsg = inet_sendmsg, /* ok */ 531 .recvmsg = inet_recvmsg, /* ok */ 532 .mmap = sock_no_mmap, 533 .sendpage = inet_sendpage, 534 .splice_read = tcp_splice_read, 535 #ifdef CONFIG_COMPAT 536 .compat_setsockopt = compat_sock_common_setsockopt, 537 .compat_getsockopt = compat_sock_common_getsockopt, 538 #endif 539 }; 540 541 const struct proto_ops inet6_dgram_ops = { 542 .family = PF_INET6, 543 .owner = THIS_MODULE, 544 .release = inet6_release, 545 .bind = inet6_bind, 546 .connect = inet_dgram_connect, /* ok */ 547 .socketpair = sock_no_socketpair, /* a do nothing */ 548 .accept = sock_no_accept, /* a do nothing */ 549 .getname = inet6_getname, 550 .poll = udp_poll, /* ok */ 551 .ioctl = inet6_ioctl, /* must change */ 552 .listen = sock_no_listen, /* ok */ 553 .shutdown = inet_shutdown, /* ok */ 554 .setsockopt = sock_common_setsockopt, /* ok */ 555 .getsockopt = sock_common_getsockopt, /* ok */ 556 .sendmsg = inet_sendmsg, /* ok */ 557 .recvmsg = inet_recvmsg, /* ok */ 558 .mmap = sock_no_mmap, 559 .sendpage = sock_no_sendpage, 560 #ifdef CONFIG_COMPAT 561 .compat_setsockopt = compat_sock_common_setsockopt, 562 .compat_getsockopt = compat_sock_common_getsockopt, 563 #endif 564 }; 565 566 static const struct net_proto_family inet6_family_ops = { 567 .family = PF_INET6, 568 .create = inet6_create, 569 .owner = THIS_MODULE, 570 }; 571 572 int inet6_register_protosw(struct inet_protosw *p) 573 { 574 struct list_head *lh; 575 struct inet_protosw *answer; 576 struct list_head *last_perm; 577 int protocol = p->protocol; 578 int ret; 579 580 spin_lock_bh(&inetsw6_lock); 581 582 ret = -EINVAL; 583 if (p->type >= SOCK_MAX) 584 goto out_illegal; 585 586 /* If we are trying to override a permanent protocol, bail. */ 587 answer = NULL; 588 ret = -EPERM; 589 last_perm = &inetsw6[p->type]; 590 list_for_each(lh, &inetsw6[p->type]) { 591 answer = list_entry(lh, struct inet_protosw, list); 592 593 /* Check only the non-wild match. */ 594 if (INET_PROTOSW_PERMANENT & answer->flags) { 595 if (protocol == answer->protocol) 596 break; 597 last_perm = lh; 598 } 599 600 answer = NULL; 601 } 602 if (answer) 603 goto out_permanent; 604 605 /* Add the new entry after the last permanent entry if any, so that 606 * the new entry does not override a permanent entry when matched with 607 * a wild-card protocol. But it is allowed to override any existing 608 * non-permanent entry. This means that when we remove this entry, the 609 * system automatically returns to the old behavior. 610 */ 611 list_add_rcu(&p->list, last_perm); 612 ret = 0; 613 out: 614 spin_unlock_bh(&inetsw6_lock); 615 return ret; 616 617 out_permanent: 618 pr_err("Attempt to override permanent protocol %d\n", protocol); 619 goto out; 620 621 out_illegal: 622 pr_err("Ignoring attempt to register invalid socket type %d\n", 623 p->type); 624 goto out; 625 } 626 EXPORT_SYMBOL(inet6_register_protosw); 627 628 void 629 inet6_unregister_protosw(struct inet_protosw *p) 630 { 631 if (INET_PROTOSW_PERMANENT & p->flags) { 632 pr_err("Attempt to unregister permanent protocol %d\n", 633 p->protocol); 634 } else { 635 spin_lock_bh(&inetsw6_lock); 636 list_del_rcu(&p->list); 637 spin_unlock_bh(&inetsw6_lock); 638 639 synchronize_net(); 640 } 641 } 642 EXPORT_SYMBOL(inet6_unregister_protosw); 643 644 int inet6_sk_rebuild_header(struct sock *sk) 645 { 646 struct ipv6_pinfo *np = inet6_sk(sk); 647 struct dst_entry *dst; 648 649 dst = __sk_dst_check(sk, np->dst_cookie); 650 651 if (dst == NULL) { 652 struct inet_sock *inet = inet_sk(sk); 653 struct in6_addr *final_p, final; 654 struct flowi6 fl6; 655 656 memset(&fl6, 0, sizeof(fl6)); 657 fl6.flowi6_proto = sk->sk_protocol; 658 fl6.daddr = np->daddr; 659 fl6.saddr = np->saddr; 660 fl6.flowlabel = np->flow_label; 661 fl6.flowi6_oif = sk->sk_bound_dev_if; 662 fl6.flowi6_mark = sk->sk_mark; 663 fl6.fl6_dport = inet->inet_dport; 664 fl6.fl6_sport = inet->inet_sport; 665 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 666 667 final_p = fl6_update_dst(&fl6, np->opt, &final); 668 669 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); 670 if (IS_ERR(dst)) { 671 sk->sk_route_caps = 0; 672 sk->sk_err_soft = -PTR_ERR(dst); 673 return PTR_ERR(dst); 674 } 675 676 __ip6_dst_store(sk, dst, NULL, NULL); 677 } 678 679 return 0; 680 } 681 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 682 683 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb) 684 { 685 const struct ipv6_pinfo *np = inet6_sk(sk); 686 const struct inet6_skb_parm *opt = IP6CB(skb); 687 688 if (np->rxopt.all) { 689 if ((opt->hop && (np->rxopt.bits.hopopts || 690 np->rxopt.bits.ohopopts)) || 691 ((IPV6_FLOWINFO_MASK & 692 *(__be32 *)skb_network_header(skb)) && 693 np->rxopt.bits.rxflow) || 694 (opt->srcrt && (np->rxopt.bits.srcrt || 695 np->rxopt.bits.osrcrt)) || 696 ((opt->dst1 || opt->dst0) && 697 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 698 return true; 699 } 700 return false; 701 } 702 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 703 704 static struct packet_type ipv6_packet_type __read_mostly = { 705 .type = cpu_to_be16(ETH_P_IPV6), 706 .func = ipv6_rcv, 707 }; 708 709 static int __init ipv6_packet_init(void) 710 { 711 dev_add_pack(&ipv6_packet_type); 712 return 0; 713 } 714 715 static void ipv6_packet_cleanup(void) 716 { 717 dev_remove_pack(&ipv6_packet_type); 718 } 719 720 static int __net_init ipv6_init_mibs(struct net *net) 721 { 722 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6, 723 sizeof(struct udp_mib), 724 __alignof__(struct udp_mib)) < 0) 725 return -ENOMEM; 726 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6, 727 sizeof(struct udp_mib), 728 __alignof__(struct udp_mib)) < 0) 729 goto err_udplite_mib; 730 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics, 731 sizeof(struct ipstats_mib), 732 __alignof__(struct ipstats_mib)) < 0) 733 goto err_ip_mib; 734 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics, 735 sizeof(struct icmpv6_mib), 736 __alignof__(struct icmpv6_mib)) < 0) 737 goto err_icmp_mib; 738 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 739 GFP_KERNEL); 740 if (!net->mib.icmpv6msg_statistics) 741 goto err_icmpmsg_mib; 742 return 0; 743 744 err_icmpmsg_mib: 745 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 746 err_icmp_mib: 747 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 748 err_ip_mib: 749 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 750 err_udplite_mib: 751 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 752 return -ENOMEM; 753 } 754 755 static void ipv6_cleanup_mibs(struct net *net) 756 { 757 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 758 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 759 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 760 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 761 kfree(net->mib.icmpv6msg_statistics); 762 } 763 764 static int __net_init inet6_net_init(struct net *net) 765 { 766 int err = 0; 767 768 net->ipv6.sysctl.bindv6only = 0; 769 net->ipv6.sysctl.icmpv6_time = 1*HZ; 770 atomic_set(&net->ipv6.rt_genid, 0); 771 772 err = ipv6_init_mibs(net); 773 if (err) 774 return err; 775 #ifdef CONFIG_PROC_FS 776 err = udp6_proc_init(net); 777 if (err) 778 goto out; 779 err = tcp6_proc_init(net); 780 if (err) 781 goto proc_tcp6_fail; 782 err = ac6_proc_init(net); 783 if (err) 784 goto proc_ac6_fail; 785 #endif 786 return err; 787 788 #ifdef CONFIG_PROC_FS 789 proc_ac6_fail: 790 tcp6_proc_exit(net); 791 proc_tcp6_fail: 792 udp6_proc_exit(net); 793 out: 794 ipv6_cleanup_mibs(net); 795 return err; 796 #endif 797 } 798 799 static void __net_exit inet6_net_exit(struct net *net) 800 { 801 #ifdef CONFIG_PROC_FS 802 udp6_proc_exit(net); 803 tcp6_proc_exit(net); 804 ac6_proc_exit(net); 805 #endif 806 ipv6_cleanup_mibs(net); 807 } 808 809 static struct pernet_operations inet6_net_ops = { 810 .init = inet6_net_init, 811 .exit = inet6_net_exit, 812 }; 813 814 static const struct ipv6_stub ipv6_stub_impl = { 815 .ipv6_sock_mc_join = ipv6_sock_mc_join, 816 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 817 .ipv6_dst_lookup = ip6_dst_lookup, 818 .udpv6_encap_enable = udpv6_encap_enable, 819 .ndisc_send_na = ndisc_send_na, 820 .nd_tbl = &nd_tbl, 821 }; 822 823 static int __init inet6_init(void) 824 { 825 struct list_head *r; 826 int err = 0; 827 828 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb)); 829 830 /* Register the socket-side information for inet6_create. */ 831 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 832 INIT_LIST_HEAD(r); 833 834 if (disable_ipv6_mod) { 835 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 836 goto out; 837 } 838 839 err = proto_register(&tcpv6_prot, 1); 840 if (err) 841 goto out; 842 843 err = proto_register(&udpv6_prot, 1); 844 if (err) 845 goto out_unregister_tcp_proto; 846 847 err = proto_register(&udplitev6_prot, 1); 848 if (err) 849 goto out_unregister_udp_proto; 850 851 err = proto_register(&rawv6_prot, 1); 852 if (err) 853 goto out_unregister_udplite_proto; 854 855 err = proto_register(&pingv6_prot, 1); 856 if (err) 857 goto out_unregister_ping_proto; 858 859 /* We MUST register RAW sockets before we create the ICMP6, 860 * IGMP6, or NDISC control sockets. 861 */ 862 err = rawv6_init(); 863 if (err) 864 goto out_unregister_raw_proto; 865 866 /* Register the family here so that the init calls below will 867 * be able to create sockets. (?? is this dangerous ??) 868 */ 869 err = sock_register(&inet6_family_ops); 870 if (err) 871 goto out_sock_register_fail; 872 873 tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 874 875 /* 876 * ipngwg API draft makes clear that the correct semantics 877 * for TCP and UDP is to consider one TCP and UDP instance 878 * in a host available by both INET and INET6 APIs and 879 * able to communicate via both network protocols. 880 */ 881 882 err = register_pernet_subsys(&inet6_net_ops); 883 if (err) 884 goto register_pernet_fail; 885 err = icmpv6_init(); 886 if (err) 887 goto icmp_fail; 888 err = ip6_mr_init(); 889 if (err) 890 goto ipmr_fail; 891 err = ndisc_init(); 892 if (err) 893 goto ndisc_fail; 894 err = igmp6_init(); 895 if (err) 896 goto igmp_fail; 897 898 ipv6_stub = &ipv6_stub_impl; 899 900 err = ipv6_netfilter_init(); 901 if (err) 902 goto netfilter_fail; 903 /* Create /proc/foo6 entries. */ 904 #ifdef CONFIG_PROC_FS 905 err = -ENOMEM; 906 if (raw6_proc_init()) 907 goto proc_raw6_fail; 908 if (udplite6_proc_init()) 909 goto proc_udplite6_fail; 910 if (ipv6_misc_proc_init()) 911 goto proc_misc6_fail; 912 if (if6_proc_init()) 913 goto proc_if6_fail; 914 #endif 915 err = ip6_route_init(); 916 if (err) 917 goto ip6_route_fail; 918 err = ndisc_late_init(); 919 if (err) 920 goto ndisc_late_fail; 921 err = ip6_flowlabel_init(); 922 if (err) 923 goto ip6_flowlabel_fail; 924 err = addrconf_init(); 925 if (err) 926 goto addrconf_fail; 927 928 /* Init v6 extension headers. */ 929 err = ipv6_exthdrs_init(); 930 if (err) 931 goto ipv6_exthdrs_fail; 932 933 err = ipv6_frag_init(); 934 if (err) 935 goto ipv6_frag_fail; 936 937 /* Init v6 transport protocols. */ 938 err = udpv6_init(); 939 if (err) 940 goto udpv6_fail; 941 942 err = udplitev6_init(); 943 if (err) 944 goto udplitev6_fail; 945 946 err = tcpv6_init(); 947 if (err) 948 goto tcpv6_fail; 949 950 err = ipv6_packet_init(); 951 if (err) 952 goto ipv6_packet_fail; 953 954 err = pingv6_init(); 955 if (err) 956 goto pingv6_fail; 957 958 #ifdef CONFIG_SYSCTL 959 err = ipv6_sysctl_register(); 960 if (err) 961 goto sysctl_fail; 962 #endif 963 out: 964 return err; 965 966 #ifdef CONFIG_SYSCTL 967 sysctl_fail: 968 ipv6_packet_cleanup(); 969 #endif 970 pingv6_fail: 971 pingv6_exit(); 972 ipv6_packet_fail: 973 tcpv6_exit(); 974 tcpv6_fail: 975 udplitev6_exit(); 976 udplitev6_fail: 977 udpv6_exit(); 978 udpv6_fail: 979 ipv6_frag_exit(); 980 ipv6_frag_fail: 981 ipv6_exthdrs_exit(); 982 ipv6_exthdrs_fail: 983 addrconf_cleanup(); 984 addrconf_fail: 985 ip6_flowlabel_cleanup(); 986 ip6_flowlabel_fail: 987 ndisc_late_cleanup(); 988 ndisc_late_fail: 989 ip6_route_cleanup(); 990 ip6_route_fail: 991 #ifdef CONFIG_PROC_FS 992 if6_proc_exit(); 993 proc_if6_fail: 994 ipv6_misc_proc_exit(); 995 proc_misc6_fail: 996 udplite6_proc_exit(); 997 proc_udplite6_fail: 998 raw6_proc_exit(); 999 proc_raw6_fail: 1000 #endif 1001 ipv6_netfilter_fini(); 1002 netfilter_fail: 1003 igmp6_cleanup(); 1004 igmp_fail: 1005 ndisc_cleanup(); 1006 ndisc_fail: 1007 ip6_mr_cleanup(); 1008 ipmr_fail: 1009 icmpv6_cleanup(); 1010 icmp_fail: 1011 unregister_pernet_subsys(&inet6_net_ops); 1012 register_pernet_fail: 1013 sock_unregister(PF_INET6); 1014 rtnl_unregister_all(PF_INET6); 1015 out_sock_register_fail: 1016 rawv6_exit(); 1017 out_unregister_ping_proto: 1018 proto_unregister(&pingv6_prot); 1019 out_unregister_raw_proto: 1020 proto_unregister(&rawv6_prot); 1021 out_unregister_udplite_proto: 1022 proto_unregister(&udplitev6_prot); 1023 out_unregister_udp_proto: 1024 proto_unregister(&udpv6_prot); 1025 out_unregister_tcp_proto: 1026 proto_unregister(&tcpv6_prot); 1027 goto out; 1028 } 1029 module_init(inet6_init); 1030 1031 static void __exit inet6_exit(void) 1032 { 1033 if (disable_ipv6_mod) 1034 return; 1035 1036 /* First of all disallow new sockets creation. */ 1037 sock_unregister(PF_INET6); 1038 /* Disallow any further netlink messages */ 1039 rtnl_unregister_all(PF_INET6); 1040 1041 udpv6_exit(); 1042 udplitev6_exit(); 1043 tcpv6_exit(); 1044 1045 /* Cleanup code parts. */ 1046 ipv6_packet_cleanup(); 1047 ipv6_frag_exit(); 1048 ipv6_exthdrs_exit(); 1049 addrconf_cleanup(); 1050 ip6_flowlabel_cleanup(); 1051 ndisc_late_cleanup(); 1052 ip6_route_cleanup(); 1053 #ifdef CONFIG_PROC_FS 1054 1055 /* Cleanup code parts. */ 1056 if6_proc_exit(); 1057 ipv6_misc_proc_exit(); 1058 udplite6_proc_exit(); 1059 raw6_proc_exit(); 1060 #endif 1061 ipv6_netfilter_fini(); 1062 ipv6_stub = NULL; 1063 igmp6_cleanup(); 1064 ndisc_cleanup(); 1065 ip6_mr_cleanup(); 1066 icmpv6_cleanup(); 1067 rawv6_exit(); 1068 1069 unregister_pernet_subsys(&inet6_net_ops); 1070 proto_unregister(&rawv6_prot); 1071 proto_unregister(&udplitev6_prot); 1072 proto_unregister(&udpv6_prot); 1073 proto_unregister(&tcpv6_prot); 1074 1075 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1076 } 1077 module_exit(inet6_exit); 1078 1079 MODULE_ALIAS_NETPROTO(PF_INET6); 1080