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 /* Look for the requested type/protocol pair. */ 114 lookup_protocol: 115 err = -ESOCKTNOSUPPORT; 116 rcu_read_lock(); 117 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 118 119 err = 0; 120 /* Check the non-wild match. */ 121 if (protocol == answer->protocol) { 122 if (protocol != IPPROTO_IP) 123 break; 124 } else { 125 /* Check for the two wild cases. */ 126 if (IPPROTO_IP == protocol) { 127 protocol = answer->protocol; 128 break; 129 } 130 if (IPPROTO_IP == answer->protocol) 131 break; 132 } 133 err = -EPROTONOSUPPORT; 134 } 135 136 if (err) { 137 if (try_loading_module < 2) { 138 rcu_read_unlock(); 139 /* 140 * Be more specific, e.g. net-pf-10-proto-132-type-1 141 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 142 */ 143 if (++try_loading_module == 1) 144 request_module("net-pf-%d-proto-%d-type-%d", 145 PF_INET6, protocol, sock->type); 146 /* 147 * Fall back to generic, e.g. net-pf-10-proto-132 148 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 149 */ 150 else 151 request_module("net-pf-%d-proto-%d", 152 PF_INET6, protocol); 153 goto lookup_protocol; 154 } else 155 goto out_rcu_unlock; 156 } 157 158 err = -EPERM; 159 if (sock->type == SOCK_RAW && !kern && 160 !ns_capable(net->user_ns, CAP_NET_RAW)) 161 goto out_rcu_unlock; 162 163 sock->ops = answer->ops; 164 answer_prot = answer->prot; 165 answer_no_check = answer->no_check; 166 answer_flags = answer->flags; 167 rcu_read_unlock(); 168 169 WARN_ON(answer_prot->slab == NULL); 170 171 err = -ENOBUFS; 172 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 173 if (sk == NULL) 174 goto out; 175 176 sock_init_data(sock, sk); 177 178 err = 0; 179 sk->sk_no_check = answer_no_check; 180 if (INET_PROTOSW_REUSE & answer_flags) 181 sk->sk_reuse = SK_CAN_REUSE; 182 183 inet = inet_sk(sk); 184 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 185 186 if (SOCK_RAW == sock->type) { 187 inet->inet_num = protocol; 188 if (IPPROTO_RAW == protocol) 189 inet->hdrincl = 1; 190 } 191 192 sk->sk_destruct = inet_sock_destruct; 193 sk->sk_family = PF_INET6; 194 sk->sk_protocol = protocol; 195 196 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 197 198 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 199 np->hop_limit = -1; 200 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 201 np->mc_loop = 1; 202 np->pmtudisc = IPV6_PMTUDISC_WANT; 203 np->ipv6only = net->ipv6.sysctl.bindv6only; 204 205 /* Init the ipv4 part of the socket since we can have sockets 206 * using v6 API for ipv4. 207 */ 208 inet->uc_ttl = -1; 209 210 inet->mc_loop = 1; 211 inet->mc_ttl = 1; 212 inet->mc_index = 0; 213 inet->mc_list = NULL; 214 inet->rcv_tos = 0; 215 216 if (ipv4_config.no_pmtu_disc) 217 inet->pmtudisc = IP_PMTUDISC_DONT; 218 else 219 inet->pmtudisc = IP_PMTUDISC_WANT; 220 /* 221 * Increment only the relevant sk_prot->socks debug field, this changes 222 * the previous behaviour of incrementing both the equivalent to 223 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 224 * 225 * This allows better debug granularity as we'll know exactly how many 226 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 227 * transport protocol socks. -acme 228 */ 229 sk_refcnt_debug_inc(sk); 230 231 if (inet->inet_num) { 232 /* It assumes that any protocol which allows 233 * the user to assign a number at socket 234 * creation time automatically shares. 235 */ 236 inet->inet_sport = htons(inet->inet_num); 237 sk->sk_prot->hash(sk); 238 } 239 if (sk->sk_prot->init) { 240 err = sk->sk_prot->init(sk); 241 if (err) { 242 sk_common_release(sk); 243 goto out; 244 } 245 } 246 out: 247 return err; 248 out_rcu_unlock: 249 rcu_read_unlock(); 250 goto out; 251 } 252 253 254 /* bind for INET6 API */ 255 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 256 { 257 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 258 struct sock *sk = sock->sk; 259 struct inet_sock *inet = inet_sk(sk); 260 struct ipv6_pinfo *np = inet6_sk(sk); 261 struct net *net = sock_net(sk); 262 __be32 v4addr = 0; 263 unsigned short snum; 264 int addr_type = 0; 265 int err = 0; 266 267 /* If the socket has its own bind function then use it. */ 268 if (sk->sk_prot->bind) 269 return sk->sk_prot->bind(sk, uaddr, addr_len); 270 271 if (addr_len < SIN6_LEN_RFC2133) 272 return -EINVAL; 273 274 if (addr->sin6_family != AF_INET6) 275 return -EAFNOSUPPORT; 276 277 addr_type = ipv6_addr_type(&addr->sin6_addr); 278 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 279 return -EINVAL; 280 281 snum = ntohs(addr->sin6_port); 282 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 283 return -EACCES; 284 285 lock_sock(sk); 286 287 /* Check these errors (active socket, double bind). */ 288 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 289 err = -EINVAL; 290 goto out; 291 } 292 293 /* Check if the address belongs to the host. */ 294 if (addr_type == IPV6_ADDR_MAPPED) { 295 int chk_addr_ret; 296 297 /* Binding to v4-mapped address on a v6-only socket 298 * makes no sense 299 */ 300 if (np->ipv6only) { 301 err = -EINVAL; 302 goto out; 303 } 304 305 /* Reproduce AF_INET checks to make the bindings consistent */ 306 v4addr = addr->sin6_addr.s6_addr32[3]; 307 chk_addr_ret = inet_addr_type(net, v4addr); 308 if (!sysctl_ip_nonlocal_bind && 309 !(inet->freebind || inet->transparent) && 310 v4addr != htonl(INADDR_ANY) && 311 chk_addr_ret != RTN_LOCAL && 312 chk_addr_ret != RTN_MULTICAST && 313 chk_addr_ret != RTN_BROADCAST) { 314 err = -EADDRNOTAVAIL; 315 goto out; 316 } 317 } else { 318 if (addr_type != IPV6_ADDR_ANY) { 319 struct net_device *dev = NULL; 320 321 rcu_read_lock(); 322 if (__ipv6_addr_needs_scope_id(addr_type)) { 323 if (addr_len >= sizeof(struct sockaddr_in6) && 324 addr->sin6_scope_id) { 325 /* Override any existing binding, if another one 326 * is supplied by user. 327 */ 328 sk->sk_bound_dev_if = addr->sin6_scope_id; 329 } 330 331 /* Binding to link-local address requires an interface */ 332 if (!sk->sk_bound_dev_if) { 333 err = -EINVAL; 334 goto out_unlock; 335 } 336 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 337 if (!dev) { 338 err = -ENODEV; 339 goto out_unlock; 340 } 341 } 342 343 /* ipv4 addr of the socket is invalid. Only the 344 * unspecified and mapped address have a v4 equivalent. 345 */ 346 v4addr = LOOPBACK4_IPV6; 347 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 348 if (!(inet->freebind || inet->transparent) && 349 !ipv6_chk_addr(net, &addr->sin6_addr, 350 dev, 0)) { 351 err = -EADDRNOTAVAIL; 352 goto out_unlock; 353 } 354 } 355 rcu_read_unlock(); 356 } 357 } 358 359 inet->inet_rcv_saddr = v4addr; 360 inet->inet_saddr = v4addr; 361 362 sk->sk_v6_rcv_saddr = addr->sin6_addr; 363 364 if (!(addr_type & IPV6_ADDR_MULTICAST)) 365 np->saddr = addr->sin6_addr; 366 367 /* Make sure we are allowed to bind here. */ 368 if (sk->sk_prot->get_port(sk, snum)) { 369 inet_reset_saddr(sk); 370 err = -EADDRINUSE; 371 goto out; 372 } 373 374 if (addr_type != IPV6_ADDR_ANY) { 375 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 376 if (addr_type != IPV6_ADDR_MAPPED) 377 np->ipv6only = 1; 378 } 379 if (snum) 380 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 381 inet->inet_sport = htons(inet->inet_num); 382 inet->inet_dport = 0; 383 inet->inet_daddr = 0; 384 out: 385 release_sock(sk); 386 return err; 387 out_unlock: 388 rcu_read_unlock(); 389 goto out; 390 } 391 EXPORT_SYMBOL(inet6_bind); 392 393 int inet6_release(struct socket *sock) 394 { 395 struct sock *sk = sock->sk; 396 397 if (sk == NULL) 398 return -EINVAL; 399 400 /* Free mc lists */ 401 ipv6_sock_mc_close(sk); 402 403 /* Free ac lists */ 404 ipv6_sock_ac_close(sk); 405 406 return inet_release(sock); 407 } 408 EXPORT_SYMBOL(inet6_release); 409 410 void inet6_destroy_sock(struct sock *sk) 411 { 412 struct ipv6_pinfo *np = inet6_sk(sk); 413 struct sk_buff *skb; 414 struct ipv6_txoptions *opt; 415 416 /* Release rx options */ 417 418 skb = xchg(&np->pktoptions, NULL); 419 if (skb != NULL) 420 kfree_skb(skb); 421 422 skb = xchg(&np->rxpmtu, NULL); 423 if (skb != NULL) 424 kfree_skb(skb); 425 426 /* Free flowlabels */ 427 fl6_free_socklist(sk); 428 429 /* Free tx options */ 430 431 opt = xchg(&np->opt, NULL); 432 if (opt != NULL) 433 sock_kfree_s(sk, opt, opt->tot_len); 434 } 435 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 436 437 /* 438 * This does both peername and sockname. 439 */ 440 441 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 442 int *uaddr_len, int peer) 443 { 444 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 445 struct sock *sk = sock->sk; 446 struct inet_sock *inet = inet_sk(sk); 447 struct ipv6_pinfo *np = inet6_sk(sk); 448 449 sin->sin6_family = AF_INET6; 450 sin->sin6_flowinfo = 0; 451 sin->sin6_scope_id = 0; 452 if (peer) { 453 if (!inet->inet_dport) 454 return -ENOTCONN; 455 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 456 peer == 1) 457 return -ENOTCONN; 458 sin->sin6_port = inet->inet_dport; 459 sin->sin6_addr = sk->sk_v6_daddr; 460 if (np->sndflow) 461 sin->sin6_flowinfo = np->flow_label; 462 } else { 463 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 464 sin->sin6_addr = np->saddr; 465 else 466 sin->sin6_addr = sk->sk_v6_rcv_saddr; 467 468 sin->sin6_port = inet->inet_sport; 469 } 470 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 471 sk->sk_bound_dev_if); 472 *uaddr_len = sizeof(*sin); 473 return 0; 474 } 475 EXPORT_SYMBOL(inet6_getname); 476 477 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 478 { 479 struct sock *sk = sock->sk; 480 struct net *net = sock_net(sk); 481 482 switch (cmd) { 483 case SIOCGSTAMP: 484 return sock_get_timestamp(sk, (struct timeval __user *)arg); 485 486 case SIOCGSTAMPNS: 487 return sock_get_timestampns(sk, (struct timespec __user *)arg); 488 489 case SIOCADDRT: 490 case SIOCDELRT: 491 492 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 493 494 case SIOCSIFADDR: 495 return addrconf_add_ifaddr(net, (void __user *) arg); 496 case SIOCDIFADDR: 497 return addrconf_del_ifaddr(net, (void __user *) arg); 498 case SIOCSIFDSTADDR: 499 return addrconf_set_dstaddr(net, (void __user *) arg); 500 default: 501 if (!sk->sk_prot->ioctl) 502 return -ENOIOCTLCMD; 503 return sk->sk_prot->ioctl(sk, cmd, arg); 504 } 505 /*NOTREACHED*/ 506 return 0; 507 } 508 EXPORT_SYMBOL(inet6_ioctl); 509 510 const struct proto_ops inet6_stream_ops = { 511 .family = PF_INET6, 512 .owner = THIS_MODULE, 513 .release = inet6_release, 514 .bind = inet6_bind, 515 .connect = inet_stream_connect, /* ok */ 516 .socketpair = sock_no_socketpair, /* a do nothing */ 517 .accept = inet_accept, /* ok */ 518 .getname = inet6_getname, 519 .poll = tcp_poll, /* ok */ 520 .ioctl = inet6_ioctl, /* must change */ 521 .listen = inet_listen, /* ok */ 522 .shutdown = inet_shutdown, /* ok */ 523 .setsockopt = sock_common_setsockopt, /* ok */ 524 .getsockopt = sock_common_getsockopt, /* ok */ 525 .sendmsg = inet_sendmsg, /* ok */ 526 .recvmsg = inet_recvmsg, /* ok */ 527 .mmap = sock_no_mmap, 528 .sendpage = inet_sendpage, 529 .splice_read = tcp_splice_read, 530 #ifdef CONFIG_COMPAT 531 .compat_setsockopt = compat_sock_common_setsockopt, 532 .compat_getsockopt = compat_sock_common_getsockopt, 533 #endif 534 }; 535 536 const struct proto_ops inet6_dgram_ops = { 537 .family = PF_INET6, 538 .owner = THIS_MODULE, 539 .release = inet6_release, 540 .bind = inet6_bind, 541 .connect = inet_dgram_connect, /* ok */ 542 .socketpair = sock_no_socketpair, /* a do nothing */ 543 .accept = sock_no_accept, /* a do nothing */ 544 .getname = inet6_getname, 545 .poll = udp_poll, /* ok */ 546 .ioctl = inet6_ioctl, /* must change */ 547 .listen = sock_no_listen, /* ok */ 548 .shutdown = inet_shutdown, /* ok */ 549 .setsockopt = sock_common_setsockopt, /* ok */ 550 .getsockopt = sock_common_getsockopt, /* ok */ 551 .sendmsg = inet_sendmsg, /* ok */ 552 .recvmsg = inet_recvmsg, /* ok */ 553 .mmap = sock_no_mmap, 554 .sendpage = sock_no_sendpage, 555 #ifdef CONFIG_COMPAT 556 .compat_setsockopt = compat_sock_common_setsockopt, 557 .compat_getsockopt = compat_sock_common_getsockopt, 558 #endif 559 }; 560 561 static const struct net_proto_family inet6_family_ops = { 562 .family = PF_INET6, 563 .create = inet6_create, 564 .owner = THIS_MODULE, 565 }; 566 567 int inet6_register_protosw(struct inet_protosw *p) 568 { 569 struct list_head *lh; 570 struct inet_protosw *answer; 571 struct list_head *last_perm; 572 int protocol = p->protocol; 573 int ret; 574 575 spin_lock_bh(&inetsw6_lock); 576 577 ret = -EINVAL; 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 ret = -EPERM; 584 last_perm = &inetsw6[p->type]; 585 list_for_each(lh, &inetsw6[p->type]) { 586 answer = list_entry(lh, struct inet_protosw, list); 587 588 /* Check only the non-wild match. */ 589 if (INET_PROTOSW_PERMANENT & answer->flags) { 590 if (protocol == answer->protocol) 591 break; 592 last_perm = lh; 593 } 594 595 answer = NULL; 596 } 597 if (answer) 598 goto out_permanent; 599 600 /* Add the new entry after the last permanent entry if any, so that 601 * the new entry does not override a permanent entry when matched with 602 * a wild-card protocol. But it is allowed to override any existing 603 * non-permanent entry. This means that when we remove this entry, the 604 * system automatically returns to the old behavior. 605 */ 606 list_add_rcu(&p->list, last_perm); 607 ret = 0; 608 out: 609 spin_unlock_bh(&inetsw6_lock); 610 return ret; 611 612 out_permanent: 613 pr_err("Attempt to override permanent protocol %d\n", protocol); 614 goto out; 615 616 out_illegal: 617 pr_err("Ignoring attempt to register invalid socket type %d\n", 618 p->type); 619 goto out; 620 } 621 EXPORT_SYMBOL(inet6_register_protosw); 622 623 void 624 inet6_unregister_protosw(struct inet_protosw *p) 625 { 626 if (INET_PROTOSW_PERMANENT & p->flags) { 627 pr_err("Attempt to unregister permanent protocol %d\n", 628 p->protocol); 629 } else { 630 spin_lock_bh(&inetsw6_lock); 631 list_del_rcu(&p->list); 632 spin_unlock_bh(&inetsw6_lock); 633 634 synchronize_net(); 635 } 636 } 637 EXPORT_SYMBOL(inet6_unregister_protosw); 638 639 int inet6_sk_rebuild_header(struct sock *sk) 640 { 641 struct ipv6_pinfo *np = inet6_sk(sk); 642 struct dst_entry *dst; 643 644 dst = __sk_dst_check(sk, np->dst_cookie); 645 646 if (dst == NULL) { 647 struct inet_sock *inet = inet_sk(sk); 648 struct in6_addr *final_p, final; 649 struct flowi6 fl6; 650 651 memset(&fl6, 0, sizeof(fl6)); 652 fl6.flowi6_proto = sk->sk_protocol; 653 fl6.daddr = sk->sk_v6_daddr; 654 fl6.saddr = np->saddr; 655 fl6.flowlabel = np->flow_label; 656 fl6.flowi6_oif = sk->sk_bound_dev_if; 657 fl6.flowi6_mark = sk->sk_mark; 658 fl6.fl6_dport = inet->inet_dport; 659 fl6.fl6_sport = inet->inet_sport; 660 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 661 662 final_p = fl6_update_dst(&fl6, np->opt, &final); 663 664 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); 665 if (IS_ERR(dst)) { 666 sk->sk_route_caps = 0; 667 sk->sk_err_soft = -PTR_ERR(dst); 668 return PTR_ERR(dst); 669 } 670 671 __ip6_dst_store(sk, dst, NULL, NULL); 672 } 673 674 return 0; 675 } 676 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 677 678 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb) 679 { 680 const struct ipv6_pinfo *np = inet6_sk(sk); 681 const struct inet6_skb_parm *opt = IP6CB(skb); 682 683 if (np->rxopt.all) { 684 if ((opt->hop && (np->rxopt.bits.hopopts || 685 np->rxopt.bits.ohopopts)) || 686 ((IPV6_FLOWINFO_MASK & 687 *(__be32 *)skb_network_header(skb)) && 688 np->rxopt.bits.rxflow) || 689 (opt->srcrt && (np->rxopt.bits.srcrt || 690 np->rxopt.bits.osrcrt)) || 691 ((opt->dst1 || opt->dst0) && 692 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 693 return true; 694 } 695 return false; 696 } 697 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 698 699 static struct packet_type ipv6_packet_type __read_mostly = { 700 .type = cpu_to_be16(ETH_P_IPV6), 701 .func = ipv6_rcv, 702 }; 703 704 static int __init ipv6_packet_init(void) 705 { 706 dev_add_pack(&ipv6_packet_type); 707 return 0; 708 } 709 710 static void ipv6_packet_cleanup(void) 711 { 712 dev_remove_pack(&ipv6_packet_type); 713 } 714 715 static int __net_init ipv6_init_mibs(struct net *net) 716 { 717 int i; 718 719 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6, 720 sizeof(struct udp_mib), 721 __alignof__(struct udp_mib)) < 0) 722 return -ENOMEM; 723 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6, 724 sizeof(struct udp_mib), 725 __alignof__(struct udp_mib)) < 0) 726 goto err_udplite_mib; 727 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics, 728 sizeof(struct ipstats_mib), 729 __alignof__(struct ipstats_mib)) < 0) 730 goto err_ip_mib; 731 732 for_each_possible_cpu(i) { 733 struct ipstats_mib *af_inet6_stats; 734 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics[0], i); 735 u64_stats_init(&af_inet6_stats->syncp); 736 #if SNMP_ARRAY_SZ == 2 737 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics[1], i); 738 u64_stats_init(&af_inet6_stats->syncp); 739 #endif 740 } 741 742 743 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics, 744 sizeof(struct icmpv6_mib), 745 __alignof__(struct icmpv6_mib)) < 0) 746 goto err_icmp_mib; 747 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 748 GFP_KERNEL); 749 if (!net->mib.icmpv6msg_statistics) 750 goto err_icmpmsg_mib; 751 return 0; 752 753 err_icmpmsg_mib: 754 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 755 err_icmp_mib: 756 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 757 err_ip_mib: 758 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 759 err_udplite_mib: 760 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 761 return -ENOMEM; 762 } 763 764 static void ipv6_cleanup_mibs(struct net *net) 765 { 766 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 767 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 768 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 769 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 770 kfree(net->mib.icmpv6msg_statistics); 771 } 772 773 static int __net_init inet6_net_init(struct net *net) 774 { 775 int err = 0; 776 777 net->ipv6.sysctl.bindv6only = 0; 778 net->ipv6.sysctl.icmpv6_time = 1*HZ; 779 atomic_set(&net->ipv6.rt_genid, 0); 780 781 err = ipv6_init_mibs(net); 782 if (err) 783 return err; 784 #ifdef CONFIG_PROC_FS 785 err = udp6_proc_init(net); 786 if (err) 787 goto out; 788 err = tcp6_proc_init(net); 789 if (err) 790 goto proc_tcp6_fail; 791 err = ac6_proc_init(net); 792 if (err) 793 goto proc_ac6_fail; 794 #endif 795 return err; 796 797 #ifdef CONFIG_PROC_FS 798 proc_ac6_fail: 799 tcp6_proc_exit(net); 800 proc_tcp6_fail: 801 udp6_proc_exit(net); 802 out: 803 ipv6_cleanup_mibs(net); 804 return err; 805 #endif 806 } 807 808 static void __net_exit inet6_net_exit(struct net *net) 809 { 810 #ifdef CONFIG_PROC_FS 811 udp6_proc_exit(net); 812 tcp6_proc_exit(net); 813 ac6_proc_exit(net); 814 #endif 815 ipv6_cleanup_mibs(net); 816 } 817 818 static struct pernet_operations inet6_net_ops = { 819 .init = inet6_net_init, 820 .exit = inet6_net_exit, 821 }; 822 823 static const struct ipv6_stub ipv6_stub_impl = { 824 .ipv6_sock_mc_join = ipv6_sock_mc_join, 825 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 826 .ipv6_dst_lookup = ip6_dst_lookup, 827 .udpv6_encap_enable = udpv6_encap_enable, 828 .ndisc_send_na = ndisc_send_na, 829 .nd_tbl = &nd_tbl, 830 }; 831 832 static int __init inet6_init(void) 833 { 834 struct list_head *r; 835 int err = 0; 836 837 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb)); 838 839 /* Register the socket-side information for inet6_create. */ 840 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 841 INIT_LIST_HEAD(r); 842 843 if (disable_ipv6_mod) { 844 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 845 goto out; 846 } 847 848 err = proto_register(&tcpv6_prot, 1); 849 if (err) 850 goto out; 851 852 err = proto_register(&udpv6_prot, 1); 853 if (err) 854 goto out_unregister_tcp_proto; 855 856 err = proto_register(&udplitev6_prot, 1); 857 if (err) 858 goto out_unregister_udp_proto; 859 860 err = proto_register(&rawv6_prot, 1); 861 if (err) 862 goto out_unregister_udplite_proto; 863 864 err = proto_register(&pingv6_prot, 1); 865 if (err) 866 goto out_unregister_ping_proto; 867 868 /* We MUST register RAW sockets before we create the ICMP6, 869 * IGMP6, or NDISC control sockets. 870 */ 871 err = rawv6_init(); 872 if (err) 873 goto out_unregister_raw_proto; 874 875 /* Register the family here so that the init calls below will 876 * be able to create sockets. (?? is this dangerous ??) 877 */ 878 err = sock_register(&inet6_family_ops); 879 if (err) 880 goto out_sock_register_fail; 881 882 /* 883 * ipngwg API draft makes clear that the correct semantics 884 * for TCP and UDP is to consider one TCP and UDP instance 885 * in a host available by both INET and INET6 APIs and 886 * able to communicate via both network protocols. 887 */ 888 889 err = register_pernet_subsys(&inet6_net_ops); 890 if (err) 891 goto register_pernet_fail; 892 err = icmpv6_init(); 893 if (err) 894 goto icmp_fail; 895 err = ip6_mr_init(); 896 if (err) 897 goto ipmr_fail; 898 err = ndisc_init(); 899 if (err) 900 goto ndisc_fail; 901 err = igmp6_init(); 902 if (err) 903 goto igmp_fail; 904 905 ipv6_stub = &ipv6_stub_impl; 906 907 err = ipv6_netfilter_init(); 908 if (err) 909 goto netfilter_fail; 910 /* Create /proc/foo6 entries. */ 911 #ifdef CONFIG_PROC_FS 912 err = -ENOMEM; 913 if (raw6_proc_init()) 914 goto proc_raw6_fail; 915 if (udplite6_proc_init()) 916 goto proc_udplite6_fail; 917 if (ipv6_misc_proc_init()) 918 goto proc_misc6_fail; 919 if (if6_proc_init()) 920 goto proc_if6_fail; 921 #endif 922 err = ip6_route_init(); 923 if (err) 924 goto ip6_route_fail; 925 err = ndisc_late_init(); 926 if (err) 927 goto ndisc_late_fail; 928 err = ip6_flowlabel_init(); 929 if (err) 930 goto ip6_flowlabel_fail; 931 err = addrconf_init(); 932 if (err) 933 goto addrconf_fail; 934 935 /* Init v6 extension headers. */ 936 err = ipv6_exthdrs_init(); 937 if (err) 938 goto ipv6_exthdrs_fail; 939 940 err = ipv6_frag_init(); 941 if (err) 942 goto ipv6_frag_fail; 943 944 /* Init v6 transport protocols. */ 945 err = udpv6_init(); 946 if (err) 947 goto udpv6_fail; 948 949 err = udplitev6_init(); 950 if (err) 951 goto udplitev6_fail; 952 953 err = tcpv6_init(); 954 if (err) 955 goto tcpv6_fail; 956 957 err = ipv6_packet_init(); 958 if (err) 959 goto ipv6_packet_fail; 960 961 err = pingv6_init(); 962 if (err) 963 goto pingv6_fail; 964 965 #ifdef CONFIG_SYSCTL 966 err = ipv6_sysctl_register(); 967 if (err) 968 goto sysctl_fail; 969 #endif 970 out: 971 return err; 972 973 #ifdef CONFIG_SYSCTL 974 sysctl_fail: 975 pingv6_exit(); 976 #endif 977 pingv6_fail: 978 ipv6_packet_cleanup(); 979 ipv6_packet_fail: 980 tcpv6_exit(); 981 tcpv6_fail: 982 udplitev6_exit(); 983 udplitev6_fail: 984 udpv6_exit(); 985 udpv6_fail: 986 ipv6_frag_exit(); 987 ipv6_frag_fail: 988 ipv6_exthdrs_exit(); 989 ipv6_exthdrs_fail: 990 addrconf_cleanup(); 991 addrconf_fail: 992 ip6_flowlabel_cleanup(); 993 ip6_flowlabel_fail: 994 ndisc_late_cleanup(); 995 ndisc_late_fail: 996 ip6_route_cleanup(); 997 ip6_route_fail: 998 #ifdef CONFIG_PROC_FS 999 if6_proc_exit(); 1000 proc_if6_fail: 1001 ipv6_misc_proc_exit(); 1002 proc_misc6_fail: 1003 udplite6_proc_exit(); 1004 proc_udplite6_fail: 1005 raw6_proc_exit(); 1006 proc_raw6_fail: 1007 #endif 1008 ipv6_netfilter_fini(); 1009 netfilter_fail: 1010 igmp6_cleanup(); 1011 igmp_fail: 1012 ndisc_cleanup(); 1013 ndisc_fail: 1014 ip6_mr_cleanup(); 1015 ipmr_fail: 1016 icmpv6_cleanup(); 1017 icmp_fail: 1018 unregister_pernet_subsys(&inet6_net_ops); 1019 register_pernet_fail: 1020 sock_unregister(PF_INET6); 1021 rtnl_unregister_all(PF_INET6); 1022 out_sock_register_fail: 1023 rawv6_exit(); 1024 out_unregister_ping_proto: 1025 proto_unregister(&pingv6_prot); 1026 out_unregister_raw_proto: 1027 proto_unregister(&rawv6_prot); 1028 out_unregister_udplite_proto: 1029 proto_unregister(&udplitev6_prot); 1030 out_unregister_udp_proto: 1031 proto_unregister(&udpv6_prot); 1032 out_unregister_tcp_proto: 1033 proto_unregister(&tcpv6_prot); 1034 goto out; 1035 } 1036 module_init(inet6_init); 1037 1038 MODULE_ALIAS_NETPROTO(PF_INET6); 1039