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 bool ipv6_mod_enabled(void) 96 { 97 return disable_ipv6_mod == 0; 98 } 99 EXPORT_SYMBOL_GPL(ipv6_mod_enabled); 100 101 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 102 { 103 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 104 105 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 106 } 107 108 static int inet6_create(struct net *net, struct socket *sock, int protocol, 109 int kern) 110 { 111 struct inet_sock *inet; 112 struct ipv6_pinfo *np; 113 struct sock *sk; 114 struct inet_protosw *answer; 115 struct proto *answer_prot; 116 unsigned char answer_flags; 117 int try_loading_module = 0; 118 int err; 119 120 if (protocol < 0 || protocol >= IPPROTO_MAX) 121 return -EINVAL; 122 123 /* Look for the requested type/protocol pair. */ 124 lookup_protocol: 125 err = -ESOCKTNOSUPPORT; 126 rcu_read_lock(); 127 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 128 129 err = 0; 130 /* Check the non-wild match. */ 131 if (protocol == answer->protocol) { 132 if (protocol != IPPROTO_IP) 133 break; 134 } else { 135 /* Check for the two wild cases. */ 136 if (IPPROTO_IP == protocol) { 137 protocol = answer->protocol; 138 break; 139 } 140 if (IPPROTO_IP == answer->protocol) 141 break; 142 } 143 err = -EPROTONOSUPPORT; 144 } 145 146 if (err) { 147 if (try_loading_module < 2) { 148 rcu_read_unlock(); 149 /* 150 * Be more specific, e.g. net-pf-10-proto-132-type-1 151 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 152 */ 153 if (++try_loading_module == 1) 154 request_module("net-pf-%d-proto-%d-type-%d", 155 PF_INET6, protocol, sock->type); 156 /* 157 * Fall back to generic, e.g. net-pf-10-proto-132 158 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 159 */ 160 else 161 request_module("net-pf-%d-proto-%d", 162 PF_INET6, protocol); 163 goto lookup_protocol; 164 } else 165 goto out_rcu_unlock; 166 } 167 168 err = -EPERM; 169 if (sock->type == SOCK_RAW && !kern && 170 !ns_capable(net->user_ns, CAP_NET_RAW)) 171 goto out_rcu_unlock; 172 173 sock->ops = answer->ops; 174 answer_prot = answer->prot; 175 answer_flags = answer->flags; 176 rcu_read_unlock(); 177 178 WARN_ON(!answer_prot->slab); 179 180 err = -ENOBUFS; 181 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 182 if (!sk) 183 goto out; 184 185 sock_init_data(sock, sk); 186 187 err = 0; 188 if (INET_PROTOSW_REUSE & answer_flags) 189 sk->sk_reuse = SK_CAN_REUSE; 190 191 inet = inet_sk(sk); 192 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 193 194 if (SOCK_RAW == sock->type) { 195 inet->inet_num = protocol; 196 if (IPPROTO_RAW == protocol) 197 inet->hdrincl = 1; 198 } 199 200 sk->sk_destruct = inet_sock_destruct; 201 sk->sk_family = PF_INET6; 202 sk->sk_protocol = protocol; 203 204 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 205 206 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 207 np->hop_limit = -1; 208 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 209 np->mc_loop = 1; 210 np->pmtudisc = IPV6_PMTUDISC_WANT; 211 np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk)); 212 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 213 214 /* Init the ipv4 part of the socket since we can have sockets 215 * using v6 API for ipv4. 216 */ 217 inet->uc_ttl = -1; 218 219 inet->mc_loop = 1; 220 inet->mc_ttl = 1; 221 inet->mc_index = 0; 222 inet->mc_list = NULL; 223 inet->rcv_tos = 0; 224 225 if (net->ipv4.sysctl_ip_no_pmtu_disc) 226 inet->pmtudisc = IP_PMTUDISC_DONT; 227 else 228 inet->pmtudisc = IP_PMTUDISC_WANT; 229 /* 230 * Increment only the relevant sk_prot->socks debug field, this changes 231 * the previous behaviour of incrementing both the equivalent to 232 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 233 * 234 * This allows better debug granularity as we'll know exactly how many 235 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 236 * transport protocol socks. -acme 237 */ 238 sk_refcnt_debug_inc(sk); 239 240 if (inet->inet_num) { 241 /* It assumes that any protocol which allows 242 * the user to assign a number at socket 243 * creation time automatically shares. 244 */ 245 inet->inet_sport = htons(inet->inet_num); 246 err = sk->sk_prot->hash(sk); 247 if (err) { 248 sk_common_release(sk); 249 goto out; 250 } 251 } 252 if (sk->sk_prot->init) { 253 err = sk->sk_prot->init(sk); 254 if (err) { 255 sk_common_release(sk); 256 goto out; 257 } 258 } 259 out: 260 return err; 261 out_rcu_unlock: 262 rcu_read_unlock(); 263 goto out; 264 } 265 266 267 /* bind for INET6 API */ 268 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 269 { 270 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 271 struct sock *sk = sock->sk; 272 struct inet_sock *inet = inet_sk(sk); 273 struct ipv6_pinfo *np = inet6_sk(sk); 274 struct net *net = sock_net(sk); 275 __be32 v4addr = 0; 276 unsigned short snum; 277 int addr_type = 0; 278 int err = 0; 279 280 /* If the socket has its own bind function then use it. */ 281 if (sk->sk_prot->bind) 282 return sk->sk_prot->bind(sk, uaddr, addr_len); 283 284 if (addr_len < SIN6_LEN_RFC2133) 285 return -EINVAL; 286 287 if (addr->sin6_family != AF_INET6) 288 return -EAFNOSUPPORT; 289 290 addr_type = ipv6_addr_type(&addr->sin6_addr); 291 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 292 return -EINVAL; 293 294 snum = ntohs(addr->sin6_port); 295 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 296 return -EACCES; 297 298 lock_sock(sk); 299 300 /* Check these errors (active socket, double bind). */ 301 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 302 err = -EINVAL; 303 goto out; 304 } 305 306 /* Check if the address belongs to the host. */ 307 if (addr_type == IPV6_ADDR_MAPPED) { 308 int chk_addr_ret; 309 310 /* Binding to v4-mapped address on a v6-only socket 311 * makes no sense 312 */ 313 if (sk->sk_ipv6only) { 314 err = -EINVAL; 315 goto out; 316 } 317 318 /* Reproduce AF_INET checks to make the bindings consistent */ 319 v4addr = addr->sin6_addr.s6_addr32[3]; 320 chk_addr_ret = inet_addr_type(net, v4addr); 321 if (!net->ipv4.sysctl_ip_nonlocal_bind && 322 !(inet->freebind || inet->transparent) && 323 v4addr != htonl(INADDR_ANY) && 324 chk_addr_ret != RTN_LOCAL && 325 chk_addr_ret != RTN_MULTICAST && 326 chk_addr_ret != RTN_BROADCAST) { 327 err = -EADDRNOTAVAIL; 328 goto out; 329 } 330 } else { 331 if (addr_type != IPV6_ADDR_ANY) { 332 struct net_device *dev = NULL; 333 334 rcu_read_lock(); 335 if (__ipv6_addr_needs_scope_id(addr_type)) { 336 if (addr_len >= sizeof(struct sockaddr_in6) && 337 addr->sin6_scope_id) { 338 /* Override any existing binding, if another one 339 * is supplied by user. 340 */ 341 sk->sk_bound_dev_if = addr->sin6_scope_id; 342 } 343 344 /* Binding to link-local address requires an interface */ 345 if (!sk->sk_bound_dev_if) { 346 err = -EINVAL; 347 goto out_unlock; 348 } 349 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 350 if (!dev) { 351 err = -ENODEV; 352 goto out_unlock; 353 } 354 } 355 356 /* ipv4 addr of the socket is invalid. Only the 357 * unspecified and mapped address have a v4 equivalent. 358 */ 359 v4addr = LOOPBACK4_IPV6; 360 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 361 if (!net->ipv6.sysctl.ip_nonlocal_bind && 362 !(inet->freebind || inet->transparent) && 363 !ipv6_chk_addr(net, &addr->sin6_addr, 364 dev, 0)) { 365 err = -EADDRNOTAVAIL; 366 goto out_unlock; 367 } 368 } 369 rcu_read_unlock(); 370 } 371 } 372 373 inet->inet_rcv_saddr = v4addr; 374 inet->inet_saddr = v4addr; 375 376 sk->sk_v6_rcv_saddr = addr->sin6_addr; 377 378 if (!(addr_type & IPV6_ADDR_MULTICAST)) 379 np->saddr = addr->sin6_addr; 380 381 /* Make sure we are allowed to bind here. */ 382 if ((snum || !inet->bind_address_no_port) && 383 sk->sk_prot->get_port(sk, snum)) { 384 inet_reset_saddr(sk); 385 err = -EADDRINUSE; 386 goto out; 387 } 388 389 if (addr_type != IPV6_ADDR_ANY) { 390 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 391 if (addr_type != IPV6_ADDR_MAPPED) 392 sk->sk_ipv6only = 1; 393 } 394 if (snum) 395 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 396 inet->inet_sport = htons(inet->inet_num); 397 inet->inet_dport = 0; 398 inet->inet_daddr = 0; 399 out: 400 release_sock(sk); 401 return err; 402 out_unlock: 403 rcu_read_unlock(); 404 goto out; 405 } 406 EXPORT_SYMBOL(inet6_bind); 407 408 int inet6_release(struct socket *sock) 409 { 410 struct sock *sk = sock->sk; 411 412 if (!sk) 413 return -EINVAL; 414 415 /* Free mc lists */ 416 ipv6_sock_mc_close(sk); 417 418 /* Free ac lists */ 419 ipv6_sock_ac_close(sk); 420 421 return inet_release(sock); 422 } 423 EXPORT_SYMBOL(inet6_release); 424 425 void inet6_destroy_sock(struct sock *sk) 426 { 427 struct ipv6_pinfo *np = inet6_sk(sk); 428 struct sk_buff *skb; 429 struct ipv6_txoptions *opt; 430 431 /* Release rx options */ 432 433 skb = xchg(&np->pktoptions, NULL); 434 if (skb) 435 kfree_skb(skb); 436 437 skb = xchg(&np->rxpmtu, NULL); 438 if (skb) 439 kfree_skb(skb); 440 441 /* Free flowlabels */ 442 fl6_free_socklist(sk); 443 444 /* Free tx options */ 445 446 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 447 if (opt) { 448 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 449 txopt_put(opt); 450 } 451 } 452 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 453 454 /* 455 * This does both peername and sockname. 456 */ 457 458 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 459 int *uaddr_len, int peer) 460 { 461 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 462 struct sock *sk = sock->sk; 463 struct inet_sock *inet = inet_sk(sk); 464 struct ipv6_pinfo *np = inet6_sk(sk); 465 466 sin->sin6_family = AF_INET6; 467 sin->sin6_flowinfo = 0; 468 sin->sin6_scope_id = 0; 469 if (peer) { 470 if (!inet->inet_dport) 471 return -ENOTCONN; 472 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 473 peer == 1) 474 return -ENOTCONN; 475 sin->sin6_port = inet->inet_dport; 476 sin->sin6_addr = sk->sk_v6_daddr; 477 if (np->sndflow) 478 sin->sin6_flowinfo = np->flow_label; 479 } else { 480 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 481 sin->sin6_addr = np->saddr; 482 else 483 sin->sin6_addr = sk->sk_v6_rcv_saddr; 484 485 sin->sin6_port = inet->inet_sport; 486 } 487 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 488 sk->sk_bound_dev_if); 489 *uaddr_len = sizeof(*sin); 490 return 0; 491 } 492 EXPORT_SYMBOL(inet6_getname); 493 494 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 495 { 496 struct sock *sk = sock->sk; 497 struct net *net = sock_net(sk); 498 499 switch (cmd) { 500 case SIOCGSTAMP: 501 return sock_get_timestamp(sk, (struct timeval __user *)arg); 502 503 case SIOCGSTAMPNS: 504 return sock_get_timestampns(sk, (struct timespec __user *)arg); 505 506 case SIOCADDRT: 507 case SIOCDELRT: 508 509 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 510 511 case SIOCSIFADDR: 512 return addrconf_add_ifaddr(net, (void __user *) arg); 513 case SIOCDIFADDR: 514 return addrconf_del_ifaddr(net, (void __user *) arg); 515 case SIOCSIFDSTADDR: 516 return addrconf_set_dstaddr(net, (void __user *) arg); 517 default: 518 if (!sk->sk_prot->ioctl) 519 return -ENOIOCTLCMD; 520 return sk->sk_prot->ioctl(sk, cmd, arg); 521 } 522 /*NOTREACHED*/ 523 return 0; 524 } 525 EXPORT_SYMBOL(inet6_ioctl); 526 527 const struct proto_ops inet6_stream_ops = { 528 .family = PF_INET6, 529 .owner = THIS_MODULE, 530 .release = inet6_release, 531 .bind = inet6_bind, 532 .connect = inet_stream_connect, /* ok */ 533 .socketpair = sock_no_socketpair, /* a do nothing */ 534 .accept = inet_accept, /* ok */ 535 .getname = inet6_getname, 536 .poll = tcp_poll, /* ok */ 537 .ioctl = inet6_ioctl, /* must change */ 538 .listen = inet_listen, /* ok */ 539 .shutdown = inet_shutdown, /* ok */ 540 .setsockopt = sock_common_setsockopt, /* ok */ 541 .getsockopt = sock_common_getsockopt, /* ok */ 542 .sendmsg = inet_sendmsg, /* ok */ 543 .recvmsg = inet_recvmsg, /* ok */ 544 .mmap = sock_no_mmap, 545 .sendpage = inet_sendpage, 546 .splice_read = tcp_splice_read, 547 #ifdef CONFIG_COMPAT 548 .compat_setsockopt = compat_sock_common_setsockopt, 549 .compat_getsockopt = compat_sock_common_getsockopt, 550 #endif 551 }; 552 553 const struct proto_ops inet6_dgram_ops = { 554 .family = PF_INET6, 555 .owner = THIS_MODULE, 556 .release = inet6_release, 557 .bind = inet6_bind, 558 .connect = inet_dgram_connect, /* ok */ 559 .socketpair = sock_no_socketpair, /* a do nothing */ 560 .accept = sock_no_accept, /* a do nothing */ 561 .getname = inet6_getname, 562 .poll = udp_poll, /* ok */ 563 .ioctl = inet6_ioctl, /* must change */ 564 .listen = sock_no_listen, /* ok */ 565 .shutdown = inet_shutdown, /* ok */ 566 .setsockopt = sock_common_setsockopt, /* ok */ 567 .getsockopt = sock_common_getsockopt, /* ok */ 568 .sendmsg = inet_sendmsg, /* ok */ 569 .recvmsg = inet_recvmsg, /* ok */ 570 .mmap = sock_no_mmap, 571 .sendpage = sock_no_sendpage, 572 .set_peek_off = sk_set_peek_off, 573 #ifdef CONFIG_COMPAT 574 .compat_setsockopt = compat_sock_common_setsockopt, 575 .compat_getsockopt = compat_sock_common_getsockopt, 576 #endif 577 }; 578 579 static const struct net_proto_family inet6_family_ops = { 580 .family = PF_INET6, 581 .create = inet6_create, 582 .owner = THIS_MODULE, 583 }; 584 585 int inet6_register_protosw(struct inet_protosw *p) 586 { 587 struct list_head *lh; 588 struct inet_protosw *answer; 589 struct list_head *last_perm; 590 int protocol = p->protocol; 591 int ret; 592 593 spin_lock_bh(&inetsw6_lock); 594 595 ret = -EINVAL; 596 if (p->type >= SOCK_MAX) 597 goto out_illegal; 598 599 /* If we are trying to override a permanent protocol, bail. */ 600 answer = NULL; 601 ret = -EPERM; 602 last_perm = &inetsw6[p->type]; 603 list_for_each(lh, &inetsw6[p->type]) { 604 answer = list_entry(lh, struct inet_protosw, list); 605 606 /* Check only the non-wild match. */ 607 if (INET_PROTOSW_PERMANENT & answer->flags) { 608 if (protocol == answer->protocol) 609 break; 610 last_perm = lh; 611 } 612 613 answer = NULL; 614 } 615 if (answer) 616 goto out_permanent; 617 618 /* Add the new entry after the last permanent entry if any, so that 619 * the new entry does not override a permanent entry when matched with 620 * a wild-card protocol. But it is allowed to override any existing 621 * non-permanent entry. This means that when we remove this entry, the 622 * system automatically returns to the old behavior. 623 */ 624 list_add_rcu(&p->list, last_perm); 625 ret = 0; 626 out: 627 spin_unlock_bh(&inetsw6_lock); 628 return ret; 629 630 out_permanent: 631 pr_err("Attempt to override permanent protocol %d\n", protocol); 632 goto out; 633 634 out_illegal: 635 pr_err("Ignoring attempt to register invalid socket type %d\n", 636 p->type); 637 goto out; 638 } 639 EXPORT_SYMBOL(inet6_register_protosw); 640 641 void 642 inet6_unregister_protosw(struct inet_protosw *p) 643 { 644 if (INET_PROTOSW_PERMANENT & p->flags) { 645 pr_err("Attempt to unregister permanent protocol %d\n", 646 p->protocol); 647 } else { 648 spin_lock_bh(&inetsw6_lock); 649 list_del_rcu(&p->list); 650 spin_unlock_bh(&inetsw6_lock); 651 652 synchronize_net(); 653 } 654 } 655 EXPORT_SYMBOL(inet6_unregister_protosw); 656 657 int inet6_sk_rebuild_header(struct sock *sk) 658 { 659 struct ipv6_pinfo *np = inet6_sk(sk); 660 struct dst_entry *dst; 661 662 dst = __sk_dst_check(sk, np->dst_cookie); 663 664 if (!dst) { 665 struct inet_sock *inet = inet_sk(sk); 666 struct in6_addr *final_p, final; 667 struct flowi6 fl6; 668 669 memset(&fl6, 0, sizeof(fl6)); 670 fl6.flowi6_proto = sk->sk_protocol; 671 fl6.daddr = sk->sk_v6_daddr; 672 fl6.saddr = np->saddr; 673 fl6.flowlabel = np->flow_label; 674 fl6.flowi6_oif = sk->sk_bound_dev_if; 675 fl6.flowi6_mark = sk->sk_mark; 676 fl6.fl6_dport = inet->inet_dport; 677 fl6.fl6_sport = inet->inet_sport; 678 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 679 680 rcu_read_lock(); 681 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 682 &final); 683 rcu_read_unlock(); 684 685 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 686 if (IS_ERR(dst)) { 687 sk->sk_route_caps = 0; 688 sk->sk_err_soft = -PTR_ERR(dst); 689 return PTR_ERR(dst); 690 } 691 692 ip6_dst_store(sk, dst, NULL, NULL); 693 } 694 695 return 0; 696 } 697 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 698 699 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 700 const struct inet6_skb_parm *opt) 701 { 702 const struct ipv6_pinfo *np = inet6_sk(sk); 703 704 if (np->rxopt.all) { 705 if (((opt->flags & IP6SKB_HOPBYHOP) && 706 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 707 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 708 np->rxopt.bits.rxflow) || 709 (opt->srcrt && (np->rxopt.bits.srcrt || 710 np->rxopt.bits.osrcrt)) || 711 ((opt->dst1 || opt->dst0) && 712 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 713 return true; 714 } 715 return false; 716 } 717 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 718 719 static struct packet_type ipv6_packet_type __read_mostly = { 720 .type = cpu_to_be16(ETH_P_IPV6), 721 .func = ipv6_rcv, 722 }; 723 724 static int __init ipv6_packet_init(void) 725 { 726 dev_add_pack(&ipv6_packet_type); 727 return 0; 728 } 729 730 static void ipv6_packet_cleanup(void) 731 { 732 dev_remove_pack(&ipv6_packet_type); 733 } 734 735 static int __net_init ipv6_init_mibs(struct net *net) 736 { 737 int i; 738 739 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 740 if (!net->mib.udp_stats_in6) 741 return -ENOMEM; 742 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 743 if (!net->mib.udplite_stats_in6) 744 goto err_udplite_mib; 745 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 746 if (!net->mib.ipv6_statistics) 747 goto err_ip_mib; 748 749 for_each_possible_cpu(i) { 750 struct ipstats_mib *af_inet6_stats; 751 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 752 u64_stats_init(&af_inet6_stats->syncp); 753 } 754 755 756 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 757 if (!net->mib.icmpv6_statistics) 758 goto err_icmp_mib; 759 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 760 GFP_KERNEL); 761 if (!net->mib.icmpv6msg_statistics) 762 goto err_icmpmsg_mib; 763 return 0; 764 765 err_icmpmsg_mib: 766 free_percpu(net->mib.icmpv6_statistics); 767 err_icmp_mib: 768 free_percpu(net->mib.ipv6_statistics); 769 err_ip_mib: 770 free_percpu(net->mib.udplite_stats_in6); 771 err_udplite_mib: 772 free_percpu(net->mib.udp_stats_in6); 773 return -ENOMEM; 774 } 775 776 static void ipv6_cleanup_mibs(struct net *net) 777 { 778 free_percpu(net->mib.udp_stats_in6); 779 free_percpu(net->mib.udplite_stats_in6); 780 free_percpu(net->mib.ipv6_statistics); 781 free_percpu(net->mib.icmpv6_statistics); 782 kfree(net->mib.icmpv6msg_statistics); 783 } 784 785 static int __net_init inet6_net_init(struct net *net) 786 { 787 int err = 0; 788 789 net->ipv6.sysctl.bindv6only = 0; 790 net->ipv6.sysctl.icmpv6_time = 1*HZ; 791 net->ipv6.sysctl.flowlabel_consistency = 1; 792 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 793 net->ipv6.sysctl.idgen_retries = 3; 794 net->ipv6.sysctl.idgen_delay = 1 * HZ; 795 net->ipv6.sysctl.flowlabel_state_ranges = 0; 796 atomic_set(&net->ipv6.fib6_sernum, 1); 797 798 err = ipv6_init_mibs(net); 799 if (err) 800 return err; 801 #ifdef CONFIG_PROC_FS 802 err = udp6_proc_init(net); 803 if (err) 804 goto out; 805 err = tcp6_proc_init(net); 806 if (err) 807 goto proc_tcp6_fail; 808 err = ac6_proc_init(net); 809 if (err) 810 goto proc_ac6_fail; 811 #endif 812 return err; 813 814 #ifdef CONFIG_PROC_FS 815 proc_ac6_fail: 816 tcp6_proc_exit(net); 817 proc_tcp6_fail: 818 udp6_proc_exit(net); 819 out: 820 ipv6_cleanup_mibs(net); 821 return err; 822 #endif 823 } 824 825 static void __net_exit inet6_net_exit(struct net *net) 826 { 827 #ifdef CONFIG_PROC_FS 828 udp6_proc_exit(net); 829 tcp6_proc_exit(net); 830 ac6_proc_exit(net); 831 #endif 832 ipv6_cleanup_mibs(net); 833 } 834 835 static struct pernet_operations inet6_net_ops = { 836 .init = inet6_net_init, 837 .exit = inet6_net_exit, 838 }; 839 840 static const struct ipv6_stub ipv6_stub_impl = { 841 .ipv6_sock_mc_join = ipv6_sock_mc_join, 842 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 843 .ipv6_dst_lookup = ip6_dst_lookup, 844 .udpv6_encap_enable = udpv6_encap_enable, 845 .ndisc_send_na = ndisc_send_na, 846 .nd_tbl = &nd_tbl, 847 }; 848 849 static int __init inet6_init(void) 850 { 851 struct list_head *r; 852 int err = 0; 853 854 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 855 856 /* Register the socket-side information for inet6_create. */ 857 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 858 INIT_LIST_HEAD(r); 859 860 if (disable_ipv6_mod) { 861 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 862 goto out; 863 } 864 865 err = proto_register(&tcpv6_prot, 1); 866 if (err) 867 goto out; 868 869 err = proto_register(&udpv6_prot, 1); 870 if (err) 871 goto out_unregister_tcp_proto; 872 873 err = proto_register(&udplitev6_prot, 1); 874 if (err) 875 goto out_unregister_udp_proto; 876 877 err = proto_register(&rawv6_prot, 1); 878 if (err) 879 goto out_unregister_udplite_proto; 880 881 err = proto_register(&pingv6_prot, 1); 882 if (err) 883 goto out_unregister_ping_proto; 884 885 /* We MUST register RAW sockets before we create the ICMP6, 886 * IGMP6, or NDISC control sockets. 887 */ 888 err = rawv6_init(); 889 if (err) 890 goto out_unregister_raw_proto; 891 892 /* Register the family here so that the init calls below will 893 * be able to create sockets. (?? is this dangerous ??) 894 */ 895 err = sock_register(&inet6_family_ops); 896 if (err) 897 goto out_sock_register_fail; 898 899 /* 900 * ipngwg API draft makes clear that the correct semantics 901 * for TCP and UDP is to consider one TCP and UDP instance 902 * in a host available by both INET and INET6 APIs and 903 * able to communicate via both network protocols. 904 */ 905 906 err = register_pernet_subsys(&inet6_net_ops); 907 if (err) 908 goto register_pernet_fail; 909 err = icmpv6_init(); 910 if (err) 911 goto icmp_fail; 912 err = ip6_mr_init(); 913 if (err) 914 goto ipmr_fail; 915 err = ndisc_init(); 916 if (err) 917 goto ndisc_fail; 918 err = igmp6_init(); 919 if (err) 920 goto igmp_fail; 921 922 ipv6_stub = &ipv6_stub_impl; 923 924 err = ipv6_netfilter_init(); 925 if (err) 926 goto netfilter_fail; 927 /* Create /proc/foo6 entries. */ 928 #ifdef CONFIG_PROC_FS 929 err = -ENOMEM; 930 if (raw6_proc_init()) 931 goto proc_raw6_fail; 932 if (udplite6_proc_init()) 933 goto proc_udplite6_fail; 934 if (ipv6_misc_proc_init()) 935 goto proc_misc6_fail; 936 if (if6_proc_init()) 937 goto proc_if6_fail; 938 #endif 939 err = ip6_route_init(); 940 if (err) 941 goto ip6_route_fail; 942 err = ndisc_late_init(); 943 if (err) 944 goto ndisc_late_fail; 945 err = ip6_flowlabel_init(); 946 if (err) 947 goto ip6_flowlabel_fail; 948 err = addrconf_init(); 949 if (err) 950 goto addrconf_fail; 951 952 /* Init v6 extension headers. */ 953 err = ipv6_exthdrs_init(); 954 if (err) 955 goto ipv6_exthdrs_fail; 956 957 err = ipv6_frag_init(); 958 if (err) 959 goto ipv6_frag_fail; 960 961 /* Init v6 transport protocols. */ 962 err = udpv6_init(); 963 if (err) 964 goto udpv6_fail; 965 966 err = udplitev6_init(); 967 if (err) 968 goto udplitev6_fail; 969 970 err = udpv6_offload_init(); 971 if (err) 972 goto udpv6_offload_fail; 973 974 err = tcpv6_init(); 975 if (err) 976 goto tcpv6_fail; 977 978 err = ipv6_packet_init(); 979 if (err) 980 goto ipv6_packet_fail; 981 982 err = pingv6_init(); 983 if (err) 984 goto pingv6_fail; 985 986 #ifdef CONFIG_SYSCTL 987 err = ipv6_sysctl_register(); 988 if (err) 989 goto sysctl_fail; 990 #endif 991 out: 992 return err; 993 994 #ifdef CONFIG_SYSCTL 995 sysctl_fail: 996 pingv6_exit(); 997 #endif 998 pingv6_fail: 999 ipv6_packet_cleanup(); 1000 ipv6_packet_fail: 1001 tcpv6_exit(); 1002 tcpv6_fail: 1003 udpv6_offload_exit(); 1004 udpv6_offload_fail: 1005 udplitev6_exit(); 1006 udplitev6_fail: 1007 udpv6_exit(); 1008 udpv6_fail: 1009 ipv6_frag_exit(); 1010 ipv6_frag_fail: 1011 ipv6_exthdrs_exit(); 1012 ipv6_exthdrs_fail: 1013 addrconf_cleanup(); 1014 addrconf_fail: 1015 ip6_flowlabel_cleanup(); 1016 ip6_flowlabel_fail: 1017 ndisc_late_cleanup(); 1018 ndisc_late_fail: 1019 ip6_route_cleanup(); 1020 ip6_route_fail: 1021 #ifdef CONFIG_PROC_FS 1022 if6_proc_exit(); 1023 proc_if6_fail: 1024 ipv6_misc_proc_exit(); 1025 proc_misc6_fail: 1026 udplite6_proc_exit(); 1027 proc_udplite6_fail: 1028 raw6_proc_exit(); 1029 proc_raw6_fail: 1030 #endif 1031 ipv6_netfilter_fini(); 1032 netfilter_fail: 1033 igmp6_cleanup(); 1034 igmp_fail: 1035 ndisc_cleanup(); 1036 ndisc_fail: 1037 ip6_mr_cleanup(); 1038 ipmr_fail: 1039 icmpv6_cleanup(); 1040 icmp_fail: 1041 unregister_pernet_subsys(&inet6_net_ops); 1042 register_pernet_fail: 1043 sock_unregister(PF_INET6); 1044 rtnl_unregister_all(PF_INET6); 1045 out_sock_register_fail: 1046 rawv6_exit(); 1047 out_unregister_ping_proto: 1048 proto_unregister(&pingv6_prot); 1049 out_unregister_raw_proto: 1050 proto_unregister(&rawv6_prot); 1051 out_unregister_udplite_proto: 1052 proto_unregister(&udplitev6_prot); 1053 out_unregister_udp_proto: 1054 proto_unregister(&udpv6_prot); 1055 out_unregister_tcp_proto: 1056 proto_unregister(&tcpv6_prot); 1057 goto out; 1058 } 1059 module_init(inet6_init); 1060 1061 MODULE_ALIAS_NETPROTO(PF_INET6); 1062