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 #include "ip6_offload.h" 68 69 MODULE_AUTHOR("Cast of dozens"); 70 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 71 MODULE_LICENSE("GPL"); 72 73 /* The inetsw6 table contains everything that inet6_create needs to 74 * build a new socket. 75 */ 76 static struct list_head inetsw6[SOCK_MAX]; 77 static DEFINE_SPINLOCK(inetsw6_lock); 78 79 struct ipv6_params ipv6_defaults = { 80 .disable_ipv6 = 0, 81 .autoconf = 1, 82 }; 83 84 static int disable_ipv6_mod; 85 86 module_param_named(disable, disable_ipv6_mod, int, 0444); 87 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 88 89 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 90 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 91 92 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 93 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 94 95 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 96 { 97 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 98 99 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 100 } 101 102 static int inet6_create(struct net *net, struct socket *sock, int protocol, 103 int kern) 104 { 105 struct inet_sock *inet; 106 struct ipv6_pinfo *np; 107 struct sock *sk; 108 struct inet_protosw *answer; 109 struct proto *answer_prot; 110 unsigned char answer_flags; 111 int try_loading_module = 0; 112 int err; 113 114 if (protocol < 0 || protocol >= IPPROTO_MAX) 115 return -EINVAL; 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_flags = answer->flags; 170 rcu_read_unlock(); 171 172 WARN_ON(!answer_prot->slab); 173 174 err = -ENOBUFS; 175 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 176 if (!sk) 177 goto out; 178 179 sock_init_data(sock, sk); 180 181 err = 0; 182 if (INET_PROTOSW_REUSE & answer_flags) 183 sk->sk_reuse = SK_CAN_REUSE; 184 185 inet = inet_sk(sk); 186 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 187 188 if (SOCK_RAW == sock->type) { 189 inet->inet_num = protocol; 190 if (IPPROTO_RAW == protocol) 191 inet->hdrincl = 1; 192 } 193 194 sk->sk_destruct = inet_sock_destruct; 195 sk->sk_family = PF_INET6; 196 sk->sk_protocol = protocol; 197 198 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 199 200 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 201 np->hop_limit = -1; 202 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 203 np->mc_loop = 1; 204 np->pmtudisc = IPV6_PMTUDISC_WANT; 205 np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk)); 206 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 207 208 /* Init the ipv4 part of the socket since we can have sockets 209 * using v6 API for ipv4. 210 */ 211 inet->uc_ttl = -1; 212 213 inet->mc_loop = 1; 214 inet->mc_ttl = 1; 215 inet->mc_index = 0; 216 inet->mc_list = NULL; 217 inet->rcv_tos = 0; 218 219 if (net->ipv4.sysctl_ip_no_pmtu_disc) 220 inet->pmtudisc = IP_PMTUDISC_DONT; 221 else 222 inet->pmtudisc = IP_PMTUDISC_WANT; 223 /* 224 * Increment only the relevant sk_prot->socks debug field, this changes 225 * the previous behaviour of incrementing both the equivalent to 226 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 227 * 228 * This allows better debug granularity as we'll know exactly how many 229 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 230 * transport protocol socks. -acme 231 */ 232 sk_refcnt_debug_inc(sk); 233 234 if (inet->inet_num) { 235 /* It assumes that any protocol which allows 236 * the user to assign a number at socket 237 * creation time automatically shares. 238 */ 239 inet->inet_sport = htons(inet->inet_num); 240 err = sk->sk_prot->hash(sk); 241 if (err) { 242 sk_common_release(sk); 243 goto out; 244 } 245 } 246 if (sk->sk_prot->init) { 247 err = sk->sk_prot->init(sk); 248 if (err) { 249 sk_common_release(sk); 250 goto out; 251 } 252 } 253 out: 254 return err; 255 out_rcu_unlock: 256 rcu_read_unlock(); 257 goto out; 258 } 259 260 261 /* bind for INET6 API */ 262 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 263 { 264 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 265 struct sock *sk = sock->sk; 266 struct inet_sock *inet = inet_sk(sk); 267 struct ipv6_pinfo *np = inet6_sk(sk); 268 struct net *net = sock_net(sk); 269 __be32 v4addr = 0; 270 unsigned short snum; 271 int addr_type = 0; 272 int err = 0; 273 274 /* If the socket has its own bind function then use it. */ 275 if (sk->sk_prot->bind) 276 return sk->sk_prot->bind(sk, uaddr, addr_len); 277 278 if (addr_len < SIN6_LEN_RFC2133) 279 return -EINVAL; 280 281 if (addr->sin6_family != AF_INET6) 282 return -EAFNOSUPPORT; 283 284 addr_type = ipv6_addr_type(&addr->sin6_addr); 285 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 286 return -EINVAL; 287 288 snum = ntohs(addr->sin6_port); 289 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 290 return -EACCES; 291 292 lock_sock(sk); 293 294 /* Check these errors (active socket, double bind). */ 295 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 296 err = -EINVAL; 297 goto out; 298 } 299 300 /* Check if the address belongs to the host. */ 301 if (addr_type == IPV6_ADDR_MAPPED) { 302 int chk_addr_ret; 303 304 /* Binding to v4-mapped address on a v6-only socket 305 * makes no sense 306 */ 307 if (sk->sk_ipv6only) { 308 err = -EINVAL; 309 goto out; 310 } 311 312 /* Reproduce AF_INET checks to make the bindings consistent */ 313 v4addr = addr->sin6_addr.s6_addr32[3]; 314 chk_addr_ret = inet_addr_type(net, v4addr); 315 if (!net->ipv4.sysctl_ip_nonlocal_bind && 316 !(inet->freebind || inet->transparent) && 317 v4addr != htonl(INADDR_ANY) && 318 chk_addr_ret != RTN_LOCAL && 319 chk_addr_ret != RTN_MULTICAST && 320 chk_addr_ret != RTN_BROADCAST) { 321 err = -EADDRNOTAVAIL; 322 goto out; 323 } 324 } else { 325 if (addr_type != IPV6_ADDR_ANY) { 326 struct net_device *dev = NULL; 327 328 rcu_read_lock(); 329 if (__ipv6_addr_needs_scope_id(addr_type)) { 330 if (addr_len >= sizeof(struct sockaddr_in6) && 331 addr->sin6_scope_id) { 332 /* Override any existing binding, if another one 333 * is supplied by user. 334 */ 335 sk->sk_bound_dev_if = addr->sin6_scope_id; 336 } 337 338 /* Binding to link-local address requires an interface */ 339 if (!sk->sk_bound_dev_if) { 340 err = -EINVAL; 341 goto out_unlock; 342 } 343 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 344 if (!dev) { 345 err = -ENODEV; 346 goto out_unlock; 347 } 348 } 349 350 /* ipv4 addr of the socket is invalid. Only the 351 * unspecified and mapped address have a v4 equivalent. 352 */ 353 v4addr = LOOPBACK4_IPV6; 354 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 355 if (!net->ipv6.sysctl.ip_nonlocal_bind && 356 !(inet->freebind || inet->transparent) && 357 !ipv6_chk_addr(net, &addr->sin6_addr, 358 dev, 0)) { 359 err = -EADDRNOTAVAIL; 360 goto out_unlock; 361 } 362 } 363 rcu_read_unlock(); 364 } 365 } 366 367 inet->inet_rcv_saddr = v4addr; 368 inet->inet_saddr = v4addr; 369 370 sk->sk_v6_rcv_saddr = addr->sin6_addr; 371 372 if (!(addr_type & IPV6_ADDR_MULTICAST)) 373 np->saddr = addr->sin6_addr; 374 375 /* Make sure we are allowed to bind here. */ 376 if ((snum || !inet->bind_address_no_port) && 377 sk->sk_prot->get_port(sk, snum)) { 378 inet_reset_saddr(sk); 379 err = -EADDRINUSE; 380 goto out; 381 } 382 383 if (addr_type != IPV6_ADDR_ANY) { 384 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 385 if (addr_type != IPV6_ADDR_MAPPED) 386 sk->sk_ipv6only = 1; 387 } 388 if (snum) 389 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 390 inet->inet_sport = htons(inet->inet_num); 391 inet->inet_dport = 0; 392 inet->inet_daddr = 0; 393 out: 394 release_sock(sk); 395 return err; 396 out_unlock: 397 rcu_read_unlock(); 398 goto out; 399 } 400 EXPORT_SYMBOL(inet6_bind); 401 402 int inet6_release(struct socket *sock) 403 { 404 struct sock *sk = sock->sk; 405 406 if (!sk) 407 return -EINVAL; 408 409 /* Free mc lists */ 410 ipv6_sock_mc_close(sk); 411 412 /* Free ac lists */ 413 ipv6_sock_ac_close(sk); 414 415 return inet_release(sock); 416 } 417 EXPORT_SYMBOL(inet6_release); 418 419 void inet6_destroy_sock(struct sock *sk) 420 { 421 struct ipv6_pinfo *np = inet6_sk(sk); 422 struct sk_buff *skb; 423 struct ipv6_txoptions *opt; 424 425 /* Release rx options */ 426 427 skb = xchg(&np->pktoptions, NULL); 428 if (skb) 429 kfree_skb(skb); 430 431 skb = xchg(&np->rxpmtu, NULL); 432 if (skb) 433 kfree_skb(skb); 434 435 /* Free flowlabels */ 436 fl6_free_socklist(sk); 437 438 /* Free tx options */ 439 440 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 441 if (opt) { 442 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 443 txopt_put(opt); 444 } 445 } 446 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 447 448 /* 449 * This does both peername and sockname. 450 */ 451 452 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 453 int *uaddr_len, int peer) 454 { 455 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 456 struct sock *sk = sock->sk; 457 struct inet_sock *inet = inet_sk(sk); 458 struct ipv6_pinfo *np = inet6_sk(sk); 459 460 sin->sin6_family = AF_INET6; 461 sin->sin6_flowinfo = 0; 462 sin->sin6_scope_id = 0; 463 if (peer) { 464 if (!inet->inet_dport) 465 return -ENOTCONN; 466 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 467 peer == 1) 468 return -ENOTCONN; 469 sin->sin6_port = inet->inet_dport; 470 sin->sin6_addr = sk->sk_v6_daddr; 471 if (np->sndflow) 472 sin->sin6_flowinfo = np->flow_label; 473 } else { 474 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 475 sin->sin6_addr = np->saddr; 476 else 477 sin->sin6_addr = sk->sk_v6_rcv_saddr; 478 479 sin->sin6_port = inet->inet_sport; 480 } 481 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 482 sk->sk_bound_dev_if); 483 *uaddr_len = sizeof(*sin); 484 return 0; 485 } 486 EXPORT_SYMBOL(inet6_getname); 487 488 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 489 { 490 struct sock *sk = sock->sk; 491 struct net *net = sock_net(sk); 492 493 switch (cmd) { 494 case SIOCGSTAMP: 495 return sock_get_timestamp(sk, (struct timeval __user *)arg); 496 497 case SIOCGSTAMPNS: 498 return sock_get_timestampns(sk, (struct timespec __user *)arg); 499 500 case SIOCADDRT: 501 case SIOCDELRT: 502 503 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 504 505 case SIOCSIFADDR: 506 return addrconf_add_ifaddr(net, (void __user *) arg); 507 case SIOCDIFADDR: 508 return addrconf_del_ifaddr(net, (void __user *) arg); 509 case SIOCSIFDSTADDR: 510 return addrconf_set_dstaddr(net, (void __user *) arg); 511 default: 512 if (!sk->sk_prot->ioctl) 513 return -ENOIOCTLCMD; 514 return sk->sk_prot->ioctl(sk, cmd, arg); 515 } 516 /*NOTREACHED*/ 517 return 0; 518 } 519 EXPORT_SYMBOL(inet6_ioctl); 520 521 const struct proto_ops inet6_stream_ops = { 522 .family = PF_INET6, 523 .owner = THIS_MODULE, 524 .release = inet6_release, 525 .bind = inet6_bind, 526 .connect = inet_stream_connect, /* ok */ 527 .socketpair = sock_no_socketpair, /* a do nothing */ 528 .accept = inet_accept, /* ok */ 529 .getname = inet6_getname, 530 .poll = tcp_poll, /* ok */ 531 .ioctl = inet6_ioctl, /* must change */ 532 .listen = inet_listen, /* ok */ 533 .shutdown = inet_shutdown, /* ok */ 534 .setsockopt = sock_common_setsockopt, /* ok */ 535 .getsockopt = sock_common_getsockopt, /* ok */ 536 .sendmsg = inet_sendmsg, /* ok */ 537 .recvmsg = inet_recvmsg, /* ok */ 538 .mmap = sock_no_mmap, 539 .sendpage = inet_sendpage, 540 .splice_read = tcp_splice_read, 541 #ifdef CONFIG_COMPAT 542 .compat_setsockopt = compat_sock_common_setsockopt, 543 .compat_getsockopt = compat_sock_common_getsockopt, 544 #endif 545 }; 546 547 const struct proto_ops inet6_dgram_ops = { 548 .family = PF_INET6, 549 .owner = THIS_MODULE, 550 .release = inet6_release, 551 .bind = inet6_bind, 552 .connect = inet_dgram_connect, /* ok */ 553 .socketpair = sock_no_socketpair, /* a do nothing */ 554 .accept = sock_no_accept, /* a do nothing */ 555 .getname = inet6_getname, 556 .poll = udp_poll, /* ok */ 557 .ioctl = inet6_ioctl, /* must change */ 558 .listen = sock_no_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 = sock_no_sendpage, 566 .set_peek_off = sk_set_peek_off, 567 #ifdef CONFIG_COMPAT 568 .compat_setsockopt = compat_sock_common_setsockopt, 569 .compat_getsockopt = compat_sock_common_getsockopt, 570 #endif 571 }; 572 573 static const struct net_proto_family inet6_family_ops = { 574 .family = PF_INET6, 575 .create = inet6_create, 576 .owner = THIS_MODULE, 577 }; 578 579 int inet6_register_protosw(struct inet_protosw *p) 580 { 581 struct list_head *lh; 582 struct inet_protosw *answer; 583 struct list_head *last_perm; 584 int protocol = p->protocol; 585 int ret; 586 587 spin_lock_bh(&inetsw6_lock); 588 589 ret = -EINVAL; 590 if (p->type >= SOCK_MAX) 591 goto out_illegal; 592 593 /* If we are trying to override a permanent protocol, bail. */ 594 answer = NULL; 595 ret = -EPERM; 596 last_perm = &inetsw6[p->type]; 597 list_for_each(lh, &inetsw6[p->type]) { 598 answer = list_entry(lh, struct inet_protosw, list); 599 600 /* Check only the non-wild match. */ 601 if (INET_PROTOSW_PERMANENT & answer->flags) { 602 if (protocol == answer->protocol) 603 break; 604 last_perm = lh; 605 } 606 607 answer = NULL; 608 } 609 if (answer) 610 goto out_permanent; 611 612 /* Add the new entry after the last permanent entry if any, so that 613 * the new entry does not override a permanent entry when matched with 614 * a wild-card protocol. But it is allowed to override any existing 615 * non-permanent entry. This means that when we remove this entry, the 616 * system automatically returns to the old behavior. 617 */ 618 list_add_rcu(&p->list, last_perm); 619 ret = 0; 620 out: 621 spin_unlock_bh(&inetsw6_lock); 622 return ret; 623 624 out_permanent: 625 pr_err("Attempt to override permanent protocol %d\n", protocol); 626 goto out; 627 628 out_illegal: 629 pr_err("Ignoring attempt to register invalid socket type %d\n", 630 p->type); 631 goto out; 632 } 633 EXPORT_SYMBOL(inet6_register_protosw); 634 635 void 636 inet6_unregister_protosw(struct inet_protosw *p) 637 { 638 if (INET_PROTOSW_PERMANENT & p->flags) { 639 pr_err("Attempt to unregister permanent protocol %d\n", 640 p->protocol); 641 } else { 642 spin_lock_bh(&inetsw6_lock); 643 list_del_rcu(&p->list); 644 spin_unlock_bh(&inetsw6_lock); 645 646 synchronize_net(); 647 } 648 } 649 EXPORT_SYMBOL(inet6_unregister_protosw); 650 651 int inet6_sk_rebuild_header(struct sock *sk) 652 { 653 struct ipv6_pinfo *np = inet6_sk(sk); 654 struct dst_entry *dst; 655 656 dst = __sk_dst_check(sk, np->dst_cookie); 657 658 if (!dst) { 659 struct inet_sock *inet = inet_sk(sk); 660 struct in6_addr *final_p, final; 661 struct flowi6 fl6; 662 663 memset(&fl6, 0, sizeof(fl6)); 664 fl6.flowi6_proto = sk->sk_protocol; 665 fl6.daddr = sk->sk_v6_daddr; 666 fl6.saddr = np->saddr; 667 fl6.flowlabel = np->flow_label; 668 fl6.flowi6_oif = sk->sk_bound_dev_if; 669 fl6.flowi6_mark = sk->sk_mark; 670 fl6.fl6_dport = inet->inet_dport; 671 fl6.fl6_sport = inet->inet_sport; 672 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 673 674 rcu_read_lock(); 675 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 676 &final); 677 rcu_read_unlock(); 678 679 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 680 if (IS_ERR(dst)) { 681 sk->sk_route_caps = 0; 682 sk->sk_err_soft = -PTR_ERR(dst); 683 return PTR_ERR(dst); 684 } 685 686 ip6_dst_store(sk, dst, NULL, NULL); 687 } 688 689 return 0; 690 } 691 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 692 693 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 694 const struct inet6_skb_parm *opt) 695 { 696 const struct ipv6_pinfo *np = inet6_sk(sk); 697 698 if (np->rxopt.all) { 699 if (((opt->flags & IP6SKB_HOPBYHOP) && 700 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 701 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 702 np->rxopt.bits.rxflow) || 703 (opt->srcrt && (np->rxopt.bits.srcrt || 704 np->rxopt.bits.osrcrt)) || 705 ((opt->dst1 || opt->dst0) && 706 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 707 return true; 708 } 709 return false; 710 } 711 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 712 713 static struct packet_type ipv6_packet_type __read_mostly = { 714 .type = cpu_to_be16(ETH_P_IPV6), 715 .func = ipv6_rcv, 716 }; 717 718 static int __init ipv6_packet_init(void) 719 { 720 dev_add_pack(&ipv6_packet_type); 721 return 0; 722 } 723 724 static void ipv6_packet_cleanup(void) 725 { 726 dev_remove_pack(&ipv6_packet_type); 727 } 728 729 static int __net_init ipv6_init_mibs(struct net *net) 730 { 731 int i; 732 733 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 734 if (!net->mib.udp_stats_in6) 735 return -ENOMEM; 736 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 737 if (!net->mib.udplite_stats_in6) 738 goto err_udplite_mib; 739 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 740 if (!net->mib.ipv6_statistics) 741 goto err_ip_mib; 742 743 for_each_possible_cpu(i) { 744 struct ipstats_mib *af_inet6_stats; 745 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 746 u64_stats_init(&af_inet6_stats->syncp); 747 } 748 749 750 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 751 if (!net->mib.icmpv6_statistics) 752 goto err_icmp_mib; 753 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 754 GFP_KERNEL); 755 if (!net->mib.icmpv6msg_statistics) 756 goto err_icmpmsg_mib; 757 return 0; 758 759 err_icmpmsg_mib: 760 free_percpu(net->mib.icmpv6_statistics); 761 err_icmp_mib: 762 free_percpu(net->mib.ipv6_statistics); 763 err_ip_mib: 764 free_percpu(net->mib.udplite_stats_in6); 765 err_udplite_mib: 766 free_percpu(net->mib.udp_stats_in6); 767 return -ENOMEM; 768 } 769 770 static void ipv6_cleanup_mibs(struct net *net) 771 { 772 free_percpu(net->mib.udp_stats_in6); 773 free_percpu(net->mib.udplite_stats_in6); 774 free_percpu(net->mib.ipv6_statistics); 775 free_percpu(net->mib.icmpv6_statistics); 776 kfree(net->mib.icmpv6msg_statistics); 777 } 778 779 static int __net_init inet6_net_init(struct net *net) 780 { 781 int err = 0; 782 783 net->ipv6.sysctl.bindv6only = 0; 784 net->ipv6.sysctl.icmpv6_time = 1*HZ; 785 net->ipv6.sysctl.flowlabel_consistency = 1; 786 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 787 net->ipv6.sysctl.idgen_retries = 3; 788 net->ipv6.sysctl.idgen_delay = 1 * HZ; 789 net->ipv6.sysctl.flowlabel_state_ranges = 0; 790 atomic_set(&net->ipv6.fib6_sernum, 1); 791 792 err = ipv6_init_mibs(net); 793 if (err) 794 return err; 795 #ifdef CONFIG_PROC_FS 796 err = udp6_proc_init(net); 797 if (err) 798 goto out; 799 err = tcp6_proc_init(net); 800 if (err) 801 goto proc_tcp6_fail; 802 err = ac6_proc_init(net); 803 if (err) 804 goto proc_ac6_fail; 805 #endif 806 return err; 807 808 #ifdef CONFIG_PROC_FS 809 proc_ac6_fail: 810 tcp6_proc_exit(net); 811 proc_tcp6_fail: 812 udp6_proc_exit(net); 813 out: 814 ipv6_cleanup_mibs(net); 815 return err; 816 #endif 817 } 818 819 static void __net_exit inet6_net_exit(struct net *net) 820 { 821 #ifdef CONFIG_PROC_FS 822 udp6_proc_exit(net); 823 tcp6_proc_exit(net); 824 ac6_proc_exit(net); 825 #endif 826 ipv6_cleanup_mibs(net); 827 } 828 829 static struct pernet_operations inet6_net_ops = { 830 .init = inet6_net_init, 831 .exit = inet6_net_exit, 832 }; 833 834 static const struct ipv6_stub ipv6_stub_impl = { 835 .ipv6_sock_mc_join = ipv6_sock_mc_join, 836 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 837 .ipv6_dst_lookup = ip6_dst_lookup, 838 .udpv6_encap_enable = udpv6_encap_enable, 839 .ndisc_send_na = ndisc_send_na, 840 .nd_tbl = &nd_tbl, 841 }; 842 843 static int __init inet6_init(void) 844 { 845 struct list_head *r; 846 int err = 0; 847 848 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 849 850 /* Register the socket-side information for inet6_create. */ 851 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 852 INIT_LIST_HEAD(r); 853 854 if (disable_ipv6_mod) { 855 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 856 goto out; 857 } 858 859 err = proto_register(&tcpv6_prot, 1); 860 if (err) 861 goto out; 862 863 err = proto_register(&udpv6_prot, 1); 864 if (err) 865 goto out_unregister_tcp_proto; 866 867 err = proto_register(&udplitev6_prot, 1); 868 if (err) 869 goto out_unregister_udp_proto; 870 871 err = proto_register(&rawv6_prot, 1); 872 if (err) 873 goto out_unregister_udplite_proto; 874 875 err = proto_register(&pingv6_prot, 1); 876 if (err) 877 goto out_unregister_ping_proto; 878 879 /* We MUST register RAW sockets before we create the ICMP6, 880 * IGMP6, or NDISC control sockets. 881 */ 882 err = rawv6_init(); 883 if (err) 884 goto out_unregister_raw_proto; 885 886 /* Register the family here so that the init calls below will 887 * be able to create sockets. (?? is this dangerous ??) 888 */ 889 err = sock_register(&inet6_family_ops); 890 if (err) 891 goto out_sock_register_fail; 892 893 /* 894 * ipngwg API draft makes clear that the correct semantics 895 * for TCP and UDP is to consider one TCP and UDP instance 896 * in a host available by both INET and INET6 APIs and 897 * able to communicate via both network protocols. 898 */ 899 900 err = register_pernet_subsys(&inet6_net_ops); 901 if (err) 902 goto register_pernet_fail; 903 err = icmpv6_init(); 904 if (err) 905 goto icmp_fail; 906 err = ip6_mr_init(); 907 if (err) 908 goto ipmr_fail; 909 err = ndisc_init(); 910 if (err) 911 goto ndisc_fail; 912 err = igmp6_init(); 913 if (err) 914 goto igmp_fail; 915 916 ipv6_stub = &ipv6_stub_impl; 917 918 err = ipv6_netfilter_init(); 919 if (err) 920 goto netfilter_fail; 921 /* Create /proc/foo6 entries. */ 922 #ifdef CONFIG_PROC_FS 923 err = -ENOMEM; 924 if (raw6_proc_init()) 925 goto proc_raw6_fail; 926 if (udplite6_proc_init()) 927 goto proc_udplite6_fail; 928 if (ipv6_misc_proc_init()) 929 goto proc_misc6_fail; 930 if (if6_proc_init()) 931 goto proc_if6_fail; 932 #endif 933 err = ip6_route_init(); 934 if (err) 935 goto ip6_route_fail; 936 err = ndisc_late_init(); 937 if (err) 938 goto ndisc_late_fail; 939 err = ip6_flowlabel_init(); 940 if (err) 941 goto ip6_flowlabel_fail; 942 err = addrconf_init(); 943 if (err) 944 goto addrconf_fail; 945 946 /* Init v6 extension headers. */ 947 err = ipv6_exthdrs_init(); 948 if (err) 949 goto ipv6_exthdrs_fail; 950 951 err = ipv6_frag_init(); 952 if (err) 953 goto ipv6_frag_fail; 954 955 /* Init v6 transport protocols. */ 956 err = udpv6_init(); 957 if (err) 958 goto udpv6_fail; 959 960 err = udplitev6_init(); 961 if (err) 962 goto udplitev6_fail; 963 964 err = udpv6_offload_init(); 965 if (err) 966 goto udpv6_offload_fail; 967 968 err = tcpv6_init(); 969 if (err) 970 goto tcpv6_fail; 971 972 err = ipv6_packet_init(); 973 if (err) 974 goto ipv6_packet_fail; 975 976 err = pingv6_init(); 977 if (err) 978 goto pingv6_fail; 979 980 #ifdef CONFIG_SYSCTL 981 err = ipv6_sysctl_register(); 982 if (err) 983 goto sysctl_fail; 984 #endif 985 out: 986 return err; 987 988 #ifdef CONFIG_SYSCTL 989 sysctl_fail: 990 pingv6_exit(); 991 #endif 992 pingv6_fail: 993 ipv6_packet_cleanup(); 994 ipv6_packet_fail: 995 tcpv6_exit(); 996 tcpv6_fail: 997 udpv6_offload_exit(); 998 udpv6_offload_fail: 999 udplitev6_exit(); 1000 udplitev6_fail: 1001 udpv6_exit(); 1002 udpv6_fail: 1003 ipv6_frag_exit(); 1004 ipv6_frag_fail: 1005 ipv6_exthdrs_exit(); 1006 ipv6_exthdrs_fail: 1007 addrconf_cleanup(); 1008 addrconf_fail: 1009 ip6_flowlabel_cleanup(); 1010 ip6_flowlabel_fail: 1011 ndisc_late_cleanup(); 1012 ndisc_late_fail: 1013 ip6_route_cleanup(); 1014 ip6_route_fail: 1015 #ifdef CONFIG_PROC_FS 1016 if6_proc_exit(); 1017 proc_if6_fail: 1018 ipv6_misc_proc_exit(); 1019 proc_misc6_fail: 1020 udplite6_proc_exit(); 1021 proc_udplite6_fail: 1022 raw6_proc_exit(); 1023 proc_raw6_fail: 1024 #endif 1025 ipv6_netfilter_fini(); 1026 netfilter_fail: 1027 igmp6_cleanup(); 1028 igmp_fail: 1029 ndisc_cleanup(); 1030 ndisc_fail: 1031 ip6_mr_cleanup(); 1032 ipmr_fail: 1033 icmpv6_cleanup(); 1034 icmp_fail: 1035 unregister_pernet_subsys(&inet6_net_ops); 1036 register_pernet_fail: 1037 sock_unregister(PF_INET6); 1038 rtnl_unregister_all(PF_INET6); 1039 out_sock_register_fail: 1040 rawv6_exit(); 1041 out_unregister_ping_proto: 1042 proto_unregister(&pingv6_prot); 1043 out_unregister_raw_proto: 1044 proto_unregister(&rawv6_prot); 1045 out_unregister_udplite_proto: 1046 proto_unregister(&udplitev6_prot); 1047 out_unregister_udp_proto: 1048 proto_unregister(&udpv6_prot); 1049 out_unregister_tcp_proto: 1050 proto_unregister(&tcpv6_prot); 1051 goto out; 1052 } 1053 module_init(inet6_init); 1054 1055 MODULE_ALIAS_NETPROTO(PF_INET6); 1056