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#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#ifdef CONFIG_ANDROID_PARANOID_NETWORK 67#include <linux/android_aid.h> 68 69static inline int current_has_network(void) 70{ 71 return in_egroup_p(AID_INET) || capable(CAP_NET_RAW); 72} 73#else 74static inline int current_has_network(void) 75{ 76 return 1; 77} 78#endif 79 80MODULE_AUTHOR("Cast of dozens"); 81MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 82MODULE_LICENSE("GPL"); 83 84/* The inetsw6 table contains everything that inet6_create needs to 85 * build a new socket. 86 */ 87static struct list_head inetsw6[SOCK_MAX]; 88static DEFINE_SPINLOCK(inetsw6_lock); 89 90struct ipv6_params ipv6_defaults = { 91 .disable_ipv6 = 0, 92 .autoconf = 1, 93}; 94 95static int disable_ipv6_mod; 96 97module_param_named(disable, disable_ipv6_mod, int, 0444); 98MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 99 100module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 101MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 102 103module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 104MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 105 106static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 107{ 108 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 109 110 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 111} 112 113static int inet6_create(struct net *net, struct socket *sock, int protocol, 114 int kern) 115{ 116 struct inet_sock *inet; 117 struct ipv6_pinfo *np; 118 struct sock *sk; 119 struct inet_protosw *answer; 120 struct proto *answer_prot; 121 unsigned char answer_flags; 122 char answer_no_check; 123 int try_loading_module = 0; 124 int err; 125 126 if (!current_has_network()) 127 return -EACCES; 128 129 if (sock->type != SOCK_RAW && 130 sock->type != SOCK_DGRAM && 131 !inet_ehash_secret) 132 build_ehash_secret(); 133 134 /* Look for the requested type/protocol pair. */ 135lookup_protocol: 136 err = -ESOCKTNOSUPPORT; 137 rcu_read_lock(); 138 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 139 140 err = 0; 141 /* Check the non-wild match. */ 142 if (protocol == answer->protocol) { 143 if (protocol != IPPROTO_IP) 144 break; 145 } else { 146 /* Check for the two wild cases. */ 147 if (IPPROTO_IP == protocol) { 148 protocol = answer->protocol; 149 break; 150 } 151 if (IPPROTO_IP == answer->protocol) 152 break; 153 } 154 err = -EPROTONOSUPPORT; 155 } 156 157 if (err) { 158 if (try_loading_module < 2) { 159 rcu_read_unlock(); 160 /* 161 * Be more specific, e.g. net-pf-10-proto-132-type-1 162 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 163 */ 164 if (++try_loading_module == 1) 165 request_module("net-pf-%d-proto-%d-type-%d", 166 PF_INET6, protocol, sock->type); 167 /* 168 * Fall back to generic, e.g. net-pf-10-proto-132 169 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 170 */ 171 else 172 request_module("net-pf-%d-proto-%d", 173 PF_INET6, protocol); 174 goto lookup_protocol; 175 } else 176 goto out_rcu_unlock; 177 } 178 179 err = -EPERM; 180 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) 181 goto out_rcu_unlock; 182 183 sock->ops = answer->ops; 184 answer_prot = answer->prot; 185 answer_no_check = answer->no_check; 186 answer_flags = answer->flags; 187 rcu_read_unlock(); 188 189 WARN_ON(answer_prot->slab == NULL); 190 191 err = -ENOBUFS; 192 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 193 if (sk == NULL) 194 goto out; 195 196 sock_init_data(sock, sk); 197 198 err = 0; 199 sk->sk_no_check = answer_no_check; 200 if (INET_PROTOSW_REUSE & answer_flags) 201 sk->sk_reuse = SK_CAN_REUSE; 202 203 inet = inet_sk(sk); 204 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 205 206 if (SOCK_RAW == sock->type) { 207 inet->inet_num = protocol; 208 if (IPPROTO_RAW == protocol) 209 inet->hdrincl = 1; 210 } 211 212 sk->sk_destruct = inet_sock_destruct; 213 sk->sk_family = PF_INET6; 214 sk->sk_protocol = protocol; 215 216 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 217 218 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 219 np->hop_limit = -1; 220 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 221 np->mc_loop = 1; 222 np->pmtudisc = IPV6_PMTUDISC_WANT; 223 np->ipv6only = net->ipv6.sysctl.bindv6only; 224 225 /* Init the ipv4 part of the socket since we can have sockets 226 * using v6 API for ipv4. 227 */ 228 inet->uc_ttl = -1; 229 230 inet->mc_loop = 1; 231 inet->mc_ttl = 1; 232 inet->mc_index = 0; 233 inet->mc_list = NULL; 234 inet->rcv_tos = 0; 235 236 if (ipv4_config.no_pmtu_disc) 237 inet->pmtudisc = IP_PMTUDISC_DONT; 238 else 239 inet->pmtudisc = IP_PMTUDISC_WANT; 240 /* 241 * Increment only the relevant sk_prot->socks debug field, this changes 242 * the previous behaviour of incrementing both the equivalent to 243 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 244 * 245 * This allows better debug granularity as we'll know exactly how many 246 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 247 * transport protocol socks. -acme 248 */ 249 sk_refcnt_debug_inc(sk); 250 251 if (inet->inet_num) { 252 /* It assumes that any protocol which allows 253 * the user to assign a number at socket 254 * creation time automatically shares. 255 */ 256 inet->inet_sport = htons(inet->inet_num); 257 sk->sk_prot->hash(sk); 258 } 259 if (sk->sk_prot->init) { 260 err = sk->sk_prot->init(sk); 261 if (err) { 262 sk_common_release(sk); 263 goto out; 264 } 265 } 266out: 267 return err; 268out_rcu_unlock: 269 rcu_read_unlock(); 270 goto out; 271} 272 273 274/* bind for INET6 API */ 275int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 276{ 277 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 278 struct sock *sk = sock->sk; 279 struct inet_sock *inet = inet_sk(sk); 280 struct ipv6_pinfo *np = inet6_sk(sk); 281 struct net *net = sock_net(sk); 282 __be32 v4addr = 0; 283 unsigned short snum; 284 int addr_type = 0; 285 int err = 0; 286 287 /* If the socket has its own bind function then use it. */ 288 if (sk->sk_prot->bind) 289 return sk->sk_prot->bind(sk, uaddr, addr_len); 290 291 if (addr_len < SIN6_LEN_RFC2133) 292 return -EINVAL; 293 294 if (addr->sin6_family != AF_INET6) 295 return -EAFNOSUPPORT; 296 297 addr_type = ipv6_addr_type(&addr->sin6_addr); 298 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 299 return -EINVAL; 300 301 snum = ntohs(addr->sin6_port); 302 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 303 return -EACCES; 304 305 lock_sock(sk); 306 307 /* Check these errors (active socket, double bind). */ 308 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 309 err = -EINVAL; 310 goto out; 311 } 312 313 /* Check if the address belongs to the host. */ 314 if (addr_type == IPV6_ADDR_MAPPED) { 315 int chk_addr_ret; 316 317 /* Binding to v4-mapped address on a v6-only socket 318 * makes no sense 319 */ 320 if (np->ipv6only) { 321 err = -EINVAL; 322 goto out; 323 } 324 325 /* Reproduce AF_INET checks to make the bindings consistent */ 326 v4addr = addr->sin6_addr.s6_addr32[3]; 327 chk_addr_ret = inet_addr_type(net, v4addr); 328 if (!sysctl_ip_nonlocal_bind && 329 !(inet->freebind || inet->transparent) && 330 v4addr != htonl(INADDR_ANY) && 331 chk_addr_ret != RTN_LOCAL && 332 chk_addr_ret != RTN_MULTICAST && 333 chk_addr_ret != RTN_BROADCAST) { 334 err = -EADDRNOTAVAIL; 335 goto out; 336 } 337 } else { 338 if (addr_type != IPV6_ADDR_ANY) { 339 struct net_device *dev = NULL; 340 341 rcu_read_lock(); 342 if (__ipv6_addr_needs_scope_id(addr_type)) { 343 if (addr_len >= sizeof(struct sockaddr_in6) && 344 addr->sin6_scope_id) { 345 /* Override any existing binding, if another one 346 * is supplied by user. 347 */ 348 sk->sk_bound_dev_if = addr->sin6_scope_id; 349 } 350 351 /* Binding to link-local address requires an interface */ 352 if (!sk->sk_bound_dev_if) { 353 err = -EINVAL; 354 goto out_unlock; 355 } 356 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 357 if (!dev) { 358 err = -ENODEV; 359 goto out_unlock; 360 } 361 } 362 363 /* ipv4 addr of the socket is invalid. Only the 364 * unspecified and mapped address have a v4 equivalent. 365 */ 366 v4addr = LOOPBACK4_IPV6; 367 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 368 if (!(inet->freebind || inet->transparent) && 369 !ipv6_chk_addr(net, &addr->sin6_addr, 370 dev, 0)) { 371 err = -EADDRNOTAVAIL; 372 goto out_unlock; 373 } 374 } 375 rcu_read_unlock(); 376 } 377 } 378 379 inet->inet_rcv_saddr = v4addr; 380 inet->inet_saddr = v4addr; 381 382 np->rcv_saddr = addr->sin6_addr; 383 384 if (!(addr_type & IPV6_ADDR_MULTICAST)) 385 np->saddr = addr->sin6_addr; 386 387 /* Make sure we are allowed to bind here. */ 388 if (sk->sk_prot->get_port(sk, snum)) { 389 inet_reset_saddr(sk); 390 err = -EADDRINUSE; 391 goto out; 392 } 393 394 if (addr_type != IPV6_ADDR_ANY) { 395 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 396 if (addr_type != IPV6_ADDR_MAPPED) 397 np->ipv6only = 1; 398 } 399 if (snum) 400 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 401 inet->inet_sport = htons(inet->inet_num); 402 inet->inet_dport = 0; 403 inet->inet_daddr = 0; 404out: 405 release_sock(sk); 406 return err; 407out_unlock: 408 rcu_read_unlock(); 409 goto out; 410} 411EXPORT_SYMBOL(inet6_bind); 412 413int inet6_release(struct socket *sock) 414{ 415 struct sock *sk = sock->sk; 416 417 if (sk == NULL) 418 return -EINVAL; 419 420 /* Free mc lists */ 421 ipv6_sock_mc_close(sk); 422 423 /* Free ac lists */ 424 ipv6_sock_ac_close(sk); 425 426 return inet_release(sock); 427} 428EXPORT_SYMBOL(inet6_release); 429 430void inet6_destroy_sock(struct sock *sk) 431{ 432 struct ipv6_pinfo *np = inet6_sk(sk); 433 struct sk_buff *skb; 434 struct ipv6_txoptions *opt; 435 436 /* Release rx options */ 437 438 skb = xchg(&np->pktoptions, NULL); 439 if (skb != NULL) 440 kfree_skb(skb); 441 442 skb = xchg(&np->rxpmtu, NULL); 443 if (skb != NULL) 444 kfree_skb(skb); 445 446 /* Free flowlabels */ 447 fl6_free_socklist(sk); 448 449 /* Free tx options */ 450 451 opt = xchg(&np->opt, NULL); 452 if (opt != NULL) 453 sock_kfree_s(sk, opt, opt->tot_len); 454} 455EXPORT_SYMBOL_GPL(inet6_destroy_sock); 456 457/* 458 * This does both peername and sockname. 459 */ 460 461int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 462 int *uaddr_len, int peer) 463{ 464 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 465 struct sock *sk = sock->sk; 466 struct inet_sock *inet = inet_sk(sk); 467 struct ipv6_pinfo *np = inet6_sk(sk); 468 469 sin->sin6_family = AF_INET6; 470 sin->sin6_flowinfo = 0; 471 sin->sin6_scope_id = 0; 472 if (peer) { 473 if (!inet->inet_dport) 474 return -ENOTCONN; 475 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 476 peer == 1) 477 return -ENOTCONN; 478 sin->sin6_port = inet->inet_dport; 479 sin->sin6_addr = np->daddr; 480 if (np->sndflow) 481 sin->sin6_flowinfo = np->flow_label; 482 } else { 483 if (ipv6_addr_any(&np->rcv_saddr)) 484 sin->sin6_addr = np->saddr; 485 else 486 sin->sin6_addr = np->rcv_saddr; 487 488 sin->sin6_port = inet->inet_sport; 489 } 490 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 491 sk->sk_bound_dev_if); 492 *uaddr_len = sizeof(*sin); 493 return 0; 494} 495EXPORT_SYMBOL(inet6_getname); 496 497int inet6_killaddr_ioctl(struct net *net, void __user *arg) { 498 struct in6_ifreq ireq; 499 struct sockaddr_in6 sin6; 500 501 if (!capable(CAP_NET_ADMIN)) 502 return -EACCES; 503 504 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 505 return -EFAULT; 506 507 sin6.sin6_family = AF_INET6; 508 sin6.sin6_addr = ireq.ifr6_addr; 509 return tcp_nuke_addr(net, (struct sockaddr *) &sin6); 510} 511 512int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 513{ 514 struct sock *sk = sock->sk; 515 struct net *net = sock_net(sk); 516 517 switch (cmd) { 518 case SIOCGSTAMP: 519 return sock_get_timestamp(sk, (struct timeval __user *)arg); 520 521 case SIOCGSTAMPNS: 522 return sock_get_timestampns(sk, (struct timespec __user *)arg); 523 524 case SIOCADDRT: 525 case SIOCDELRT: 526 527 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 528 529 case SIOCSIFADDR: 530 return addrconf_add_ifaddr(net, (void __user *) arg); 531 case SIOCDIFADDR: 532 return addrconf_del_ifaddr(net, (void __user *) arg); 533 case SIOCSIFDSTADDR: 534 return addrconf_set_dstaddr(net, (void __user *) arg); 535 case SIOCKILLADDR: 536 return inet6_killaddr_ioctl(net, (void __user *) arg); 537 default: 538 if (!sk->sk_prot->ioctl) 539 return -ENOIOCTLCMD; 540 return sk->sk_prot->ioctl(sk, cmd, arg); 541 } 542 /*NOTREACHED*/ 543 return 0; 544} 545EXPORT_SYMBOL(inet6_ioctl); 546 547const struct proto_ops inet6_stream_ops = { 548 .family = PF_INET6, 549 .owner = THIS_MODULE, 550 .release = inet6_release, 551 .bind = inet6_bind, 552 .connect = inet_stream_connect, /* ok */ 553 .socketpair = sock_no_socketpair, /* a do nothing */ 554 .accept = inet_accept, /* ok */ 555 .getname = inet6_getname, 556 .poll = tcp_poll, /* ok */ 557 .ioctl = inet6_ioctl, /* must change */ 558 .listen = inet_listen, /* ok */ 559 .shutdown = inet_shutdown, /* ok */ 560 .setsockopt = sock_common_setsockopt, /* ok */ 561 .getsockopt = sock_common_getsockopt, /* ok */ 562 .sendmsg = inet_sendmsg, /* ok */ 563 .recvmsg = inet_recvmsg, /* ok */ 564 .mmap = sock_no_mmap, 565 .sendpage = inet_sendpage, 566 .splice_read = tcp_splice_read, 567#ifdef CONFIG_COMPAT 568 .compat_setsockopt = compat_sock_common_setsockopt, 569 .compat_getsockopt = compat_sock_common_getsockopt, 570#endif 571}; 572 573const struct proto_ops inet6_dgram_ops = { 574 .family = PF_INET6, 575 .owner = THIS_MODULE, 576 .release = inet6_release, 577 .bind = inet6_bind, 578 .connect = inet_dgram_connect, /* ok */ 579 .socketpair = sock_no_socketpair, /* a do nothing */ 580 .accept = sock_no_accept, /* a do nothing */ 581 .getname = inet6_getname, 582 .poll = udp_poll, /* ok */ 583 .ioctl = inet6_ioctl, /* must change */ 584 .listen = sock_no_listen, /* ok */ 585 .shutdown = inet_shutdown, /* ok */ 586 .setsockopt = sock_common_setsockopt, /* ok */ 587 .getsockopt = sock_common_getsockopt, /* ok */ 588 .sendmsg = inet_sendmsg, /* ok */ 589 .recvmsg = inet_recvmsg, /* ok */ 590 .mmap = sock_no_mmap, 591 .sendpage = sock_no_sendpage, 592#ifdef CONFIG_COMPAT 593 .compat_setsockopt = compat_sock_common_setsockopt, 594 .compat_getsockopt = compat_sock_common_getsockopt, 595#endif 596}; 597 598static const struct net_proto_family inet6_family_ops = { 599 .family = PF_INET6, 600 .create = inet6_create, 601 .owner = THIS_MODULE, 602}; 603 604int inet6_register_protosw(struct inet_protosw *p) 605{ 606 struct list_head *lh; 607 struct inet_protosw *answer; 608 struct list_head *last_perm; 609 int protocol = p->protocol; 610 int ret; 611 612 spin_lock_bh(&inetsw6_lock); 613 614 ret = -EINVAL; 615 if (p->type >= SOCK_MAX) 616 goto out_illegal; 617 618 /* If we are trying to override a permanent protocol, bail. */ 619 answer = NULL; 620 ret = -EPERM; 621 last_perm = &inetsw6[p->type]; 622 list_for_each(lh, &inetsw6[p->type]) { 623 answer = list_entry(lh, struct inet_protosw, list); 624 625 /* Check only the non-wild match. */ 626 if (INET_PROTOSW_PERMANENT & answer->flags) { 627 if (protocol == answer->protocol) 628 break; 629 last_perm = lh; 630 } 631 632 answer = NULL; 633 } 634 if (answer) 635 goto out_permanent; 636 637 /* Add the new entry after the last permanent entry if any, so that 638 * the new entry does not override a permanent entry when matched with 639 * a wild-card protocol. But it is allowed to override any existing 640 * non-permanent entry. This means that when we remove this entry, the 641 * system automatically returns to the old behavior. 642 */ 643 list_add_rcu(&p->list, last_perm); 644 ret = 0; 645out: 646 spin_unlock_bh(&inetsw6_lock); 647 return ret; 648 649out_permanent: 650 pr_err("Attempt to override permanent protocol %d\n", protocol); 651 goto out; 652 653out_illegal: 654 pr_err("Ignoring attempt to register invalid socket type %d\n", 655 p->type); 656 goto out; 657} 658EXPORT_SYMBOL(inet6_register_protosw); 659 660void 661inet6_unregister_protosw(struct inet_protosw *p) 662{ 663 if (INET_PROTOSW_PERMANENT & p->flags) { 664 pr_err("Attempt to unregister permanent protocol %d\n", 665 p->protocol); 666 } else { 667 spin_lock_bh(&inetsw6_lock); 668 list_del_rcu(&p->list); 669 spin_unlock_bh(&inetsw6_lock); 670 671 synchronize_net(); 672 } 673} 674EXPORT_SYMBOL(inet6_unregister_protosw); 675 676int inet6_sk_rebuild_header(struct sock *sk) 677{ 678 struct ipv6_pinfo *np = inet6_sk(sk); 679 struct dst_entry *dst; 680 681 dst = __sk_dst_check(sk, np->dst_cookie); 682 683 if (dst == NULL) { 684 struct inet_sock *inet = inet_sk(sk); 685 struct in6_addr *final_p, final; 686 struct flowi6 fl6; 687 688 memset(&fl6, 0, sizeof(fl6)); 689 fl6.flowi6_proto = sk->sk_protocol; 690 fl6.daddr = np->daddr; 691 fl6.saddr = np->saddr; 692 fl6.flowlabel = np->flow_label; 693 fl6.flowi6_oif = sk->sk_bound_dev_if; 694 fl6.flowi6_mark = sk->sk_mark; 695 fl6.fl6_dport = inet->inet_dport; 696 fl6.fl6_sport = inet->inet_sport; 697 fl6.flowi6_uid = sock_i_uid(sk); 698 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 699 700 final_p = fl6_update_dst(&fl6, np->opt, &final); 701 702 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); 703 if (IS_ERR(dst)) { 704 sk->sk_route_caps = 0; 705 sk->sk_err_soft = -PTR_ERR(dst); 706 return PTR_ERR(dst); 707 } 708 709 __ip6_dst_store(sk, dst, NULL, NULL); 710 } 711 712 return 0; 713} 714EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 715 716bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb) 717{ 718 const struct ipv6_pinfo *np = inet6_sk(sk); 719 const struct inet6_skb_parm *opt = IP6CB(skb); 720 721 if (np->rxopt.all) { 722 if ((opt->hop && (np->rxopt.bits.hopopts || 723 np->rxopt.bits.ohopopts)) || 724 ((IPV6_FLOWINFO_MASK & 725 *(__be32 *)skb_network_header(skb)) && 726 np->rxopt.bits.rxflow) || 727 (opt->srcrt && (np->rxopt.bits.srcrt || 728 np->rxopt.bits.osrcrt)) || 729 ((opt->dst1 || opt->dst0) && 730 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 731 return true; 732 } 733 return false; 734} 735EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 736 737static struct packet_type ipv6_packet_type __read_mostly = { 738 .type = cpu_to_be16(ETH_P_IPV6), 739 .func = ipv6_rcv, 740}; 741 742static int __init ipv6_packet_init(void) 743{ 744 dev_add_pack(&ipv6_packet_type); 745 return 0; 746} 747 748static void ipv6_packet_cleanup(void) 749{ 750 dev_remove_pack(&ipv6_packet_type); 751} 752 753static int __net_init ipv6_init_mibs(struct net *net) 754{ 755 if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6, 756 sizeof(struct udp_mib), 757 __alignof__(struct udp_mib)) < 0) 758 return -ENOMEM; 759 if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6, 760 sizeof(struct udp_mib), 761 __alignof__(struct udp_mib)) < 0) 762 goto err_udplite_mib; 763 if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics, 764 sizeof(struct ipstats_mib), 765 __alignof__(struct ipstats_mib)) < 0) 766 goto err_ip_mib; 767 if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics, 768 sizeof(struct icmpv6_mib), 769 __alignof__(struct icmpv6_mib)) < 0) 770 goto err_icmp_mib; 771 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 772 GFP_KERNEL); 773 if (!net->mib.icmpv6msg_statistics) 774 goto err_icmpmsg_mib; 775 return 0; 776 777err_icmpmsg_mib: 778 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 779err_icmp_mib: 780 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 781err_ip_mib: 782 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 783err_udplite_mib: 784 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 785 return -ENOMEM; 786} 787 788static void ipv6_cleanup_mibs(struct net *net) 789{ 790 snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); 791 snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); 792 snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); 793 snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); 794 kfree(net->mib.icmpv6msg_statistics); 795} 796 797static int __net_init inet6_net_init(struct net *net) 798{ 799 int err = 0; 800 801 net->ipv6.sysctl.bindv6only = 0; 802 net->ipv6.sysctl.icmpv6_time = 1*HZ; 803 804 err = ipv6_init_mibs(net); 805 if (err) 806 return err; 807#ifdef CONFIG_PROC_FS 808 err = udp6_proc_init(net); 809 if (err) 810 goto out; 811 err = tcp6_proc_init(net); 812 if (err) 813 goto proc_tcp6_fail; 814 err = ac6_proc_init(net); 815 if (err) 816 goto proc_ac6_fail; 817#endif 818 return err; 819 820#ifdef CONFIG_PROC_FS 821proc_ac6_fail: 822 tcp6_proc_exit(net); 823proc_tcp6_fail: 824 udp6_proc_exit(net); 825out: 826 ipv6_cleanup_mibs(net); 827 return err; 828#endif 829} 830 831static void __net_exit inet6_net_exit(struct net *net) 832{ 833#ifdef CONFIG_PROC_FS 834 udp6_proc_exit(net); 835 tcp6_proc_exit(net); 836 ac6_proc_exit(net); 837#endif 838 ipv6_cleanup_mibs(net); 839} 840 841static struct pernet_operations inet6_net_ops = { 842 .init = inet6_net_init, 843 .exit = inet6_net_exit, 844}; 845 846static int __init inet6_init(void) 847{ 848 struct list_head *r; 849 int err = 0; 850 851 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb)); 852 853 /* Register the socket-side information for inet6_create. */ 854 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 855 INIT_LIST_HEAD(r); 856 857 if (disable_ipv6_mod) { 858 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 859 goto out; 860 } 861 862 err = proto_register(&tcpv6_prot, 1); 863 if (err) 864 goto out; 865 866 err = proto_register(&udpv6_prot, 1); 867 if (err) 868 goto out_unregister_tcp_proto; 869 870 err = proto_register(&udplitev6_prot, 1); 871 if (err) 872 goto out_unregister_udp_proto; 873 874 err = proto_register(&rawv6_prot, 1); 875 if (err) 876 goto out_unregister_udplite_proto; 877 878 err = proto_register(&pingv6_prot, 1); 879 if (err) 880 goto out_unregister_ping_proto; 881 882 /* We MUST register RAW sockets before we create the ICMP6, 883 * IGMP6, or NDISC control sockets. 884 */ 885 err = rawv6_init(); 886 if (err) 887 goto out_unregister_raw_proto; 888 889 /* Register the family here so that the init calls below will 890 * be able to create sockets. (?? is this dangerous ??) 891 */ 892 err = sock_register(&inet6_family_ops); 893 if (err) 894 goto out_sock_register_fail; 895 896 tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem; 897 898 /* 899 * ipngwg API draft makes clear that the correct semantics 900 * for TCP and UDP is to consider one TCP and UDP instance 901 * in a host available by both INET and INET6 APIs and 902 * able to communicate via both network protocols. 903 */ 904 905 err = register_pernet_subsys(&inet6_net_ops); 906 if (err) 907 goto register_pernet_fail; 908 err = icmpv6_init(); 909 if (err) 910 goto icmp_fail; 911 err = ip6_mr_init(); 912 if (err) 913 goto ipmr_fail; 914 err = ndisc_init(); 915 if (err) 916 goto ndisc_fail; 917 err = igmp6_init(); 918 if (err) 919 goto igmp_fail; 920 err = ipv6_netfilter_init(); 921 if (err) 922 goto netfilter_fail; 923 /* Create /proc/foo6 entries. */ 924#ifdef CONFIG_PROC_FS 925 err = -ENOMEM; 926 if (raw6_proc_init()) 927 goto proc_raw6_fail; 928 if (udplite6_proc_init()) 929 goto proc_udplite6_fail; 930 if (ipv6_misc_proc_init()) 931 goto proc_misc6_fail; 932 if (if6_proc_init()) 933 goto proc_if6_fail; 934#endif 935 err = ip6_route_init(); 936 if (err) 937 goto ip6_route_fail; 938 err = ip6_flowlabel_init(); 939 if (err) 940 goto ip6_flowlabel_fail; 941 err = addrconf_init(); 942 if (err) 943 goto addrconf_fail; 944 945 /* Init v6 extension headers. */ 946 err = ipv6_exthdrs_init(); 947 if (err) 948 goto ipv6_exthdrs_fail; 949 950 err = ipv6_frag_init(); 951 if (err) 952 goto ipv6_frag_fail; 953 954 /* Init v6 transport protocols. */ 955 err = udpv6_init(); 956 if (err) 957 goto udpv6_fail; 958 959 err = udplitev6_init(); 960 if (err) 961 goto udplitev6_fail; 962 963 err = tcpv6_init(); 964 if (err) 965 goto tcpv6_fail; 966 967 err = ipv6_packet_init(); 968 if (err) 969 goto ipv6_packet_fail; 970 971 err = pingv6_init(); 972 if (err) 973 goto pingv6_fail; 974 975#ifdef CONFIG_SYSCTL 976 err = ipv6_sysctl_register(); 977 if (err) 978 goto sysctl_fail; 979#endif 980out: 981 return err; 982 983#ifdef CONFIG_SYSCTL 984sysctl_fail: 985 ipv6_packet_cleanup(); 986#endif 987pingv6_fail: 988 pingv6_exit(); 989ipv6_packet_fail: 990 tcpv6_exit(); 991tcpv6_fail: 992 udplitev6_exit(); 993udplitev6_fail: 994 udpv6_exit(); 995udpv6_fail: 996 ipv6_frag_exit(); 997ipv6_frag_fail: 998 ipv6_exthdrs_exit(); 999ipv6_exthdrs_fail: 1000 addrconf_cleanup(); 1001addrconf_fail: 1002 ip6_flowlabel_cleanup(); 1003ip6_flowlabel_fail: 1004 ip6_route_cleanup(); 1005ip6_route_fail: 1006#ifdef CONFIG_PROC_FS 1007 if6_proc_exit(); 1008proc_if6_fail: 1009 ipv6_misc_proc_exit(); 1010proc_misc6_fail: 1011 udplite6_proc_exit(); 1012proc_udplite6_fail: 1013 raw6_proc_exit(); 1014proc_raw6_fail: 1015#endif 1016 ipv6_netfilter_fini(); 1017netfilter_fail: 1018 igmp6_cleanup(); 1019igmp_fail: 1020 ndisc_cleanup(); 1021ndisc_fail: 1022 ip6_mr_cleanup(); 1023ipmr_fail: 1024 icmpv6_cleanup(); 1025icmp_fail: 1026 unregister_pernet_subsys(&inet6_net_ops); 1027register_pernet_fail: 1028 sock_unregister(PF_INET6); 1029 rtnl_unregister_all(PF_INET6); 1030out_sock_register_fail: 1031 rawv6_exit(); 1032out_unregister_ping_proto: 1033 proto_unregister(&pingv6_prot); 1034out_unregister_raw_proto: 1035 proto_unregister(&rawv6_prot); 1036out_unregister_udplite_proto: 1037 proto_unregister(&udplitev6_prot); 1038out_unregister_udp_proto: 1039 proto_unregister(&udpv6_prot); 1040out_unregister_tcp_proto: 1041 proto_unregister(&tcpv6_prot); 1042 goto out; 1043} 1044module_init(inet6_init); 1045 1046static void __exit inet6_exit(void) 1047{ 1048 if (disable_ipv6_mod) 1049 return; 1050 1051 /* First of all disallow new sockets creation. */ 1052 sock_unregister(PF_INET6); 1053 /* Disallow any further netlink messages */ 1054 rtnl_unregister_all(PF_INET6); 1055 1056 udpv6_exit(); 1057 udplitev6_exit(); 1058 tcpv6_exit(); 1059 1060 /* Cleanup code parts. */ 1061 ipv6_packet_cleanup(); 1062 ipv6_frag_exit(); 1063 ipv6_exthdrs_exit(); 1064 addrconf_cleanup(); 1065 ip6_flowlabel_cleanup(); 1066 ip6_route_cleanup(); 1067#ifdef CONFIG_PROC_FS 1068 1069 /* Cleanup code parts. */ 1070 if6_proc_exit(); 1071 ipv6_misc_proc_exit(); 1072 udplite6_proc_exit(); 1073 raw6_proc_exit(); 1074#endif 1075 ipv6_netfilter_fini(); 1076 igmp6_cleanup(); 1077 ndisc_cleanup(); 1078 ip6_mr_cleanup(); 1079 icmpv6_cleanup(); 1080 rawv6_exit(); 1081 1082 unregister_pernet_subsys(&inet6_net_ops); 1083 proto_unregister(&rawv6_prot); 1084 proto_unregister(&udplitev6_prot); 1085 proto_unregister(&udpv6_prot); 1086 proto_unregister(&tcpv6_prot); 1087 1088 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1089} 1090module_exit(inet6_exit); 1091 1092MODULE_ALIAS_NETPROTO(PF_INET6); 1093