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 #include <net/calipso.h> 64 65 #include <asm/uaccess.h> 66 #include <linux/mroute6.h> 67 68 #include "ip6_offload.h" 69 70 MODULE_AUTHOR("Cast of dozens"); 71 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 72 MODULE_LICENSE("GPL"); 73 74 /* The inetsw6 table contains everything that inet6_create needs to 75 * build a new socket. 76 */ 77 static struct list_head inetsw6[SOCK_MAX]; 78 static DEFINE_SPINLOCK(inetsw6_lock); 79 80 struct ipv6_params ipv6_defaults = { 81 .disable_ipv6 = 0, 82 .autoconf = 1, 83 }; 84 85 static int disable_ipv6_mod; 86 87 module_param_named(disable, disable_ipv6_mod, int, 0444); 88 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 89 90 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 91 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 92 93 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 94 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 95 96 bool ipv6_mod_enabled(void) 97 { 98 return disable_ipv6_mod == 0; 99 } 100 EXPORT_SYMBOL_GPL(ipv6_mod_enabled); 101 102 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 103 { 104 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 105 106 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 107 } 108 109 static int inet6_create(struct net *net, struct socket *sock, int protocol, 110 int kern) 111 { 112 struct inet_sock *inet; 113 struct ipv6_pinfo *np; 114 struct sock *sk; 115 struct inet_protosw *answer; 116 struct proto *answer_prot; 117 unsigned char answer_flags; 118 int try_loading_module = 0; 119 int err; 120 121 if (protocol < 0 || protocol >= IPPROTO_MAX) 122 return -EINVAL; 123 124 /* Look for the requested type/protocol pair. */ 125 lookup_protocol: 126 err = -ESOCKTNOSUPPORT; 127 rcu_read_lock(); 128 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 129 130 err = 0; 131 /* Check the non-wild match. */ 132 if (protocol == answer->protocol) { 133 if (protocol != IPPROTO_IP) 134 break; 135 } else { 136 /* Check for the two wild cases. */ 137 if (IPPROTO_IP == protocol) { 138 protocol = answer->protocol; 139 break; 140 } 141 if (IPPROTO_IP == answer->protocol) 142 break; 143 } 144 err = -EPROTONOSUPPORT; 145 } 146 147 if (err) { 148 if (try_loading_module < 2) { 149 rcu_read_unlock(); 150 /* 151 * Be more specific, e.g. net-pf-10-proto-132-type-1 152 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 153 */ 154 if (++try_loading_module == 1) 155 request_module("net-pf-%d-proto-%d-type-%d", 156 PF_INET6, protocol, sock->type); 157 /* 158 * Fall back to generic, e.g. net-pf-10-proto-132 159 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 160 */ 161 else 162 request_module("net-pf-%d-proto-%d", 163 PF_INET6, protocol); 164 goto lookup_protocol; 165 } else 166 goto out_rcu_unlock; 167 } 168 169 err = -EPERM; 170 if (sock->type == SOCK_RAW && !kern && 171 !ns_capable(net->user_ns, CAP_NET_RAW)) 172 goto out_rcu_unlock; 173 174 sock->ops = answer->ops; 175 answer_prot = answer->prot; 176 answer_flags = answer->flags; 177 rcu_read_unlock(); 178 179 WARN_ON(!answer_prot->slab); 180 181 err = -ENOBUFS; 182 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 183 if (!sk) 184 goto out; 185 186 sock_init_data(sock, sk); 187 188 err = 0; 189 if (INET_PROTOSW_REUSE & answer_flags) 190 sk->sk_reuse = SK_CAN_REUSE; 191 192 inet = inet_sk(sk); 193 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 194 195 if (SOCK_RAW == sock->type) { 196 inet->inet_num = protocol; 197 if (IPPROTO_RAW == protocol) 198 inet->hdrincl = 1; 199 } 200 201 sk->sk_destruct = inet_sock_destruct; 202 sk->sk_family = PF_INET6; 203 sk->sk_protocol = protocol; 204 205 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 206 207 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 208 np->hop_limit = -1; 209 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 210 np->mc_loop = 1; 211 np->pmtudisc = IPV6_PMTUDISC_WANT; 212 np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk)); 213 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 214 215 /* Init the ipv4 part of the socket since we can have sockets 216 * using v6 API for ipv4. 217 */ 218 inet->uc_ttl = -1; 219 220 inet->mc_loop = 1; 221 inet->mc_ttl = 1; 222 inet->mc_index = 0; 223 inet->mc_list = NULL; 224 inet->rcv_tos = 0; 225 226 if (net->ipv4.sysctl_ip_no_pmtu_disc) 227 inet->pmtudisc = IP_PMTUDISC_DONT; 228 else 229 inet->pmtudisc = IP_PMTUDISC_WANT; 230 /* 231 * Increment only the relevant sk_prot->socks debug field, this changes 232 * the previous behaviour of incrementing both the equivalent to 233 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 234 * 235 * This allows better debug granularity as we'll know exactly how many 236 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 237 * transport protocol socks. -acme 238 */ 239 sk_refcnt_debug_inc(sk); 240 241 if (inet->inet_num) { 242 /* It assumes that any protocol which allows 243 * the user to assign a number at socket 244 * creation time automatically shares. 245 */ 246 inet->inet_sport = htons(inet->inet_num); 247 err = sk->sk_prot->hash(sk); 248 if (err) { 249 sk_common_release(sk); 250 goto out; 251 } 252 } 253 if (sk->sk_prot->init) { 254 err = sk->sk_prot->init(sk); 255 if (err) { 256 sk_common_release(sk); 257 goto out; 258 } 259 } 260 out: 261 return err; 262 out_rcu_unlock: 263 rcu_read_unlock(); 264 goto out; 265 } 266 267 268 /* bind for INET6 API */ 269 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 270 { 271 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 272 struct sock *sk = sock->sk; 273 struct inet_sock *inet = inet_sk(sk); 274 struct ipv6_pinfo *np = inet6_sk(sk); 275 struct net *net = sock_net(sk); 276 __be32 v4addr = 0; 277 unsigned short snum; 278 int addr_type = 0; 279 int err = 0; 280 281 /* If the socket has its own bind function then use it. */ 282 if (sk->sk_prot->bind) 283 return sk->sk_prot->bind(sk, uaddr, addr_len); 284 285 if (addr_len < SIN6_LEN_RFC2133) 286 return -EINVAL; 287 288 if (addr->sin6_family != AF_INET6) 289 return -EAFNOSUPPORT; 290 291 addr_type = ipv6_addr_type(&addr->sin6_addr); 292 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 293 return -EINVAL; 294 295 snum = ntohs(addr->sin6_port); 296 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 297 return -EACCES; 298 299 lock_sock(sk); 300 301 /* Check these errors (active socket, double bind). */ 302 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 303 err = -EINVAL; 304 goto out; 305 } 306 307 /* Check if the address belongs to the host. */ 308 if (addr_type == IPV6_ADDR_MAPPED) { 309 int chk_addr_ret; 310 311 /* Binding to v4-mapped address on a v6-only socket 312 * makes no sense 313 */ 314 if (sk->sk_ipv6only) { 315 err = -EINVAL; 316 goto out; 317 } 318 319 /* Reproduce AF_INET checks to make the bindings consistent */ 320 v4addr = addr->sin6_addr.s6_addr32[3]; 321 chk_addr_ret = inet_addr_type(net, v4addr); 322 if (!net->ipv4.sysctl_ip_nonlocal_bind && 323 !(inet->freebind || inet->transparent) && 324 v4addr != htonl(INADDR_ANY) && 325 chk_addr_ret != RTN_LOCAL && 326 chk_addr_ret != RTN_MULTICAST && 327 chk_addr_ret != RTN_BROADCAST) { 328 err = -EADDRNOTAVAIL; 329 goto out; 330 } 331 } else { 332 if (addr_type != IPV6_ADDR_ANY) { 333 struct net_device *dev = NULL; 334 335 rcu_read_lock(); 336 if (__ipv6_addr_needs_scope_id(addr_type)) { 337 if (addr_len >= sizeof(struct sockaddr_in6) && 338 addr->sin6_scope_id) { 339 /* Override any existing binding, if another one 340 * is supplied by user. 341 */ 342 sk->sk_bound_dev_if = addr->sin6_scope_id; 343 } 344 345 /* Binding to link-local address requires an interface */ 346 if (!sk->sk_bound_dev_if) { 347 err = -EINVAL; 348 goto out_unlock; 349 } 350 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 351 if (!dev) { 352 err = -ENODEV; 353 goto out_unlock; 354 } 355 } 356 357 /* ipv4 addr of the socket is invalid. Only the 358 * unspecified and mapped address have a v4 equivalent. 359 */ 360 v4addr = LOOPBACK4_IPV6; 361 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 362 if (!net->ipv6.sysctl.ip_nonlocal_bind && 363 !(inet->freebind || inet->transparent) && 364 !ipv6_chk_addr(net, &addr->sin6_addr, 365 dev, 0)) { 366 err = -EADDRNOTAVAIL; 367 goto out_unlock; 368 } 369 } 370 rcu_read_unlock(); 371 } 372 } 373 374 inet->inet_rcv_saddr = v4addr; 375 inet->inet_saddr = v4addr; 376 377 sk->sk_v6_rcv_saddr = addr->sin6_addr; 378 379 if (!(addr_type & IPV6_ADDR_MULTICAST)) 380 np->saddr = addr->sin6_addr; 381 382 /* Make sure we are allowed to bind here. */ 383 if ((snum || !inet->bind_address_no_port) && 384 sk->sk_prot->get_port(sk, snum)) { 385 inet_reset_saddr(sk); 386 err = -EADDRINUSE; 387 goto out; 388 } 389 390 if (addr_type != IPV6_ADDR_ANY) { 391 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 392 if (addr_type != IPV6_ADDR_MAPPED) 393 sk->sk_ipv6only = 1; 394 } 395 if (snum) 396 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 397 inet->inet_sport = htons(inet->inet_num); 398 inet->inet_dport = 0; 399 inet->inet_daddr = 0; 400 out: 401 release_sock(sk); 402 return err; 403 out_unlock: 404 rcu_read_unlock(); 405 goto out; 406 } 407 EXPORT_SYMBOL(inet6_bind); 408 409 int inet6_release(struct socket *sock) 410 { 411 struct sock *sk = sock->sk; 412 413 if (!sk) 414 return -EINVAL; 415 416 /* Free mc lists */ 417 ipv6_sock_mc_close(sk); 418 419 /* Free ac lists */ 420 ipv6_sock_ac_close(sk); 421 422 return inet_release(sock); 423 } 424 EXPORT_SYMBOL(inet6_release); 425 426 void inet6_destroy_sock(struct sock *sk) 427 { 428 struct ipv6_pinfo *np = inet6_sk(sk); 429 struct sk_buff *skb; 430 struct ipv6_txoptions *opt; 431 432 /* Release rx options */ 433 434 skb = xchg(&np->pktoptions, NULL); 435 if (skb) 436 kfree_skb(skb); 437 438 skb = xchg(&np->rxpmtu, NULL); 439 if (skb) 440 kfree_skb(skb); 441 442 /* Free flowlabels */ 443 fl6_free_socklist(sk); 444 445 /* Free tx options */ 446 447 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 448 if (opt) { 449 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 450 txopt_put(opt); 451 } 452 } 453 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 454 455 /* 456 * This does both peername and sockname. 457 */ 458 459 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 460 int *uaddr_len, int peer) 461 { 462 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 463 struct sock *sk = sock->sk; 464 struct inet_sock *inet = inet_sk(sk); 465 struct ipv6_pinfo *np = inet6_sk(sk); 466 467 sin->sin6_family = AF_INET6; 468 sin->sin6_flowinfo = 0; 469 sin->sin6_scope_id = 0; 470 if (peer) { 471 if (!inet->inet_dport) 472 return -ENOTCONN; 473 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 474 peer == 1) 475 return -ENOTCONN; 476 sin->sin6_port = inet->inet_dport; 477 sin->sin6_addr = sk->sk_v6_daddr; 478 if (np->sndflow) 479 sin->sin6_flowinfo = np->flow_label; 480 } else { 481 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 482 sin->sin6_addr = np->saddr; 483 else 484 sin->sin6_addr = sk->sk_v6_rcv_saddr; 485 486 sin->sin6_port = inet->inet_sport; 487 } 488 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 489 sk->sk_bound_dev_if); 490 *uaddr_len = sizeof(*sin); 491 return 0; 492 } 493 EXPORT_SYMBOL(inet6_getname); 494 495 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 496 { 497 struct sock *sk = sock->sk; 498 struct net *net = sock_net(sk); 499 500 switch (cmd) { 501 case SIOCGSTAMP: 502 return sock_get_timestamp(sk, (struct timeval __user *)arg); 503 504 case SIOCGSTAMPNS: 505 return sock_get_timestampns(sk, (struct timespec __user *)arg); 506 507 case SIOCADDRT: 508 case SIOCDELRT: 509 510 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 511 512 case SIOCSIFADDR: 513 return addrconf_add_ifaddr(net, (void __user *) arg); 514 case SIOCDIFADDR: 515 return addrconf_del_ifaddr(net, (void __user *) arg); 516 case SIOCSIFDSTADDR: 517 return addrconf_set_dstaddr(net, (void __user *) arg); 518 default: 519 if (!sk->sk_prot->ioctl) 520 return -ENOIOCTLCMD; 521 return sk->sk_prot->ioctl(sk, cmd, arg); 522 } 523 /*NOTREACHED*/ 524 return 0; 525 } 526 EXPORT_SYMBOL(inet6_ioctl); 527 528 const struct proto_ops inet6_stream_ops = { 529 .family = PF_INET6, 530 .owner = THIS_MODULE, 531 .release = inet6_release, 532 .bind = inet6_bind, 533 .connect = inet_stream_connect, /* ok */ 534 .socketpair = sock_no_socketpair, /* a do nothing */ 535 .accept = inet_accept, /* ok */ 536 .getname = inet6_getname, 537 .poll = tcp_poll, /* ok */ 538 .ioctl = inet6_ioctl, /* must change */ 539 .listen = inet_listen, /* ok */ 540 .shutdown = inet_shutdown, /* ok */ 541 .setsockopt = sock_common_setsockopt, /* ok */ 542 .getsockopt = sock_common_getsockopt, /* ok */ 543 .sendmsg = inet_sendmsg, /* ok */ 544 .recvmsg = inet_recvmsg, /* ok */ 545 .mmap = sock_no_mmap, 546 .sendpage = inet_sendpage, 547 .splice_read = tcp_splice_read, 548 .read_sock = tcp_read_sock, 549 .peek_len = tcp_peek_len, 550 #ifdef CONFIG_COMPAT 551 .compat_setsockopt = compat_sock_common_setsockopt, 552 .compat_getsockopt = compat_sock_common_getsockopt, 553 #endif 554 }; 555 556 const struct proto_ops inet6_dgram_ops = { 557 .family = PF_INET6, 558 .owner = THIS_MODULE, 559 .release = inet6_release, 560 .bind = inet6_bind, 561 .connect = inet_dgram_connect, /* ok */ 562 .socketpair = sock_no_socketpair, /* a do nothing */ 563 .accept = sock_no_accept, /* a do nothing */ 564 .getname = inet6_getname, 565 .poll = udp_poll, /* ok */ 566 .ioctl = inet6_ioctl, /* must change */ 567 .listen = sock_no_listen, /* ok */ 568 .shutdown = inet_shutdown, /* ok */ 569 .setsockopt = sock_common_setsockopt, /* ok */ 570 .getsockopt = sock_common_getsockopt, /* ok */ 571 .sendmsg = inet_sendmsg, /* ok */ 572 .recvmsg = inet_recvmsg, /* ok */ 573 .mmap = sock_no_mmap, 574 .sendpage = sock_no_sendpage, 575 .set_peek_off = sk_set_peek_off, 576 #ifdef CONFIG_COMPAT 577 .compat_setsockopt = compat_sock_common_setsockopt, 578 .compat_getsockopt = compat_sock_common_getsockopt, 579 #endif 580 }; 581 582 static const struct net_proto_family inet6_family_ops = { 583 .family = PF_INET6, 584 .create = inet6_create, 585 .owner = THIS_MODULE, 586 }; 587 588 int inet6_register_protosw(struct inet_protosw *p) 589 { 590 struct list_head *lh; 591 struct inet_protosw *answer; 592 struct list_head *last_perm; 593 int protocol = p->protocol; 594 int ret; 595 596 spin_lock_bh(&inetsw6_lock); 597 598 ret = -EINVAL; 599 if (p->type >= SOCK_MAX) 600 goto out_illegal; 601 602 /* If we are trying to override a permanent protocol, bail. */ 603 answer = NULL; 604 ret = -EPERM; 605 last_perm = &inetsw6[p->type]; 606 list_for_each(lh, &inetsw6[p->type]) { 607 answer = list_entry(lh, struct inet_protosw, list); 608 609 /* Check only the non-wild match. */ 610 if (INET_PROTOSW_PERMANENT & answer->flags) { 611 if (protocol == answer->protocol) 612 break; 613 last_perm = lh; 614 } 615 616 answer = NULL; 617 } 618 if (answer) 619 goto out_permanent; 620 621 /* Add the new entry after the last permanent entry if any, so that 622 * the new entry does not override a permanent entry when matched with 623 * a wild-card protocol. But it is allowed to override any existing 624 * non-permanent entry. This means that when we remove this entry, the 625 * system automatically returns to the old behavior. 626 */ 627 list_add_rcu(&p->list, last_perm); 628 ret = 0; 629 out: 630 spin_unlock_bh(&inetsw6_lock); 631 return ret; 632 633 out_permanent: 634 pr_err("Attempt to override permanent protocol %d\n", protocol); 635 goto out; 636 637 out_illegal: 638 pr_err("Ignoring attempt to register invalid socket type %d\n", 639 p->type); 640 goto out; 641 } 642 EXPORT_SYMBOL(inet6_register_protosw); 643 644 void 645 inet6_unregister_protosw(struct inet_protosw *p) 646 { 647 if (INET_PROTOSW_PERMANENT & p->flags) { 648 pr_err("Attempt to unregister permanent protocol %d\n", 649 p->protocol); 650 } else { 651 spin_lock_bh(&inetsw6_lock); 652 list_del_rcu(&p->list); 653 spin_unlock_bh(&inetsw6_lock); 654 655 synchronize_net(); 656 } 657 } 658 EXPORT_SYMBOL(inet6_unregister_protosw); 659 660 int inet6_sk_rebuild_header(struct sock *sk) 661 { 662 struct ipv6_pinfo *np = inet6_sk(sk); 663 struct dst_entry *dst; 664 665 dst = __sk_dst_check(sk, np->dst_cookie); 666 667 if (!dst) { 668 struct inet_sock *inet = inet_sk(sk); 669 struct in6_addr *final_p, final; 670 struct flowi6 fl6; 671 672 memset(&fl6, 0, sizeof(fl6)); 673 fl6.flowi6_proto = sk->sk_protocol; 674 fl6.daddr = sk->sk_v6_daddr; 675 fl6.saddr = np->saddr; 676 fl6.flowlabel = np->flow_label; 677 fl6.flowi6_oif = sk->sk_bound_dev_if; 678 fl6.flowi6_mark = sk->sk_mark; 679 fl6.fl6_dport = inet->inet_dport; 680 fl6.fl6_sport = inet->inet_sport; 681 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 682 683 rcu_read_lock(); 684 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 685 &final); 686 rcu_read_unlock(); 687 688 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 689 if (IS_ERR(dst)) { 690 sk->sk_route_caps = 0; 691 sk->sk_err_soft = -PTR_ERR(dst); 692 return PTR_ERR(dst); 693 } 694 695 ip6_dst_store(sk, dst, NULL, NULL); 696 } 697 698 return 0; 699 } 700 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 701 702 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 703 const struct inet6_skb_parm *opt) 704 { 705 const struct ipv6_pinfo *np = inet6_sk(sk); 706 707 if (np->rxopt.all) { 708 if (((opt->flags & IP6SKB_HOPBYHOP) && 709 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 710 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 711 np->rxopt.bits.rxflow) || 712 (opt->srcrt && (np->rxopt.bits.srcrt || 713 np->rxopt.bits.osrcrt)) || 714 ((opt->dst1 || opt->dst0) && 715 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 716 return true; 717 } 718 return false; 719 } 720 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 721 722 static struct packet_type ipv6_packet_type __read_mostly = { 723 .type = cpu_to_be16(ETH_P_IPV6), 724 .func = ipv6_rcv, 725 }; 726 727 static int __init ipv6_packet_init(void) 728 { 729 dev_add_pack(&ipv6_packet_type); 730 return 0; 731 } 732 733 static void ipv6_packet_cleanup(void) 734 { 735 dev_remove_pack(&ipv6_packet_type); 736 } 737 738 static int __net_init ipv6_init_mibs(struct net *net) 739 { 740 int i; 741 742 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 743 if (!net->mib.udp_stats_in6) 744 return -ENOMEM; 745 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 746 if (!net->mib.udplite_stats_in6) 747 goto err_udplite_mib; 748 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 749 if (!net->mib.ipv6_statistics) 750 goto err_ip_mib; 751 752 for_each_possible_cpu(i) { 753 struct ipstats_mib *af_inet6_stats; 754 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 755 u64_stats_init(&af_inet6_stats->syncp); 756 } 757 758 759 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 760 if (!net->mib.icmpv6_statistics) 761 goto err_icmp_mib; 762 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 763 GFP_KERNEL); 764 if (!net->mib.icmpv6msg_statistics) 765 goto err_icmpmsg_mib; 766 return 0; 767 768 err_icmpmsg_mib: 769 free_percpu(net->mib.icmpv6_statistics); 770 err_icmp_mib: 771 free_percpu(net->mib.ipv6_statistics); 772 err_ip_mib: 773 free_percpu(net->mib.udplite_stats_in6); 774 err_udplite_mib: 775 free_percpu(net->mib.udp_stats_in6); 776 return -ENOMEM; 777 } 778 779 static void ipv6_cleanup_mibs(struct net *net) 780 { 781 free_percpu(net->mib.udp_stats_in6); 782 free_percpu(net->mib.udplite_stats_in6); 783 free_percpu(net->mib.ipv6_statistics); 784 free_percpu(net->mib.icmpv6_statistics); 785 kfree(net->mib.icmpv6msg_statistics); 786 } 787 788 static int __net_init inet6_net_init(struct net *net) 789 { 790 int err = 0; 791 792 net->ipv6.sysctl.bindv6only = 0; 793 net->ipv6.sysctl.icmpv6_time = 1*HZ; 794 net->ipv6.sysctl.flowlabel_consistency = 1; 795 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 796 net->ipv6.sysctl.idgen_retries = 3; 797 net->ipv6.sysctl.idgen_delay = 1 * HZ; 798 net->ipv6.sysctl.flowlabel_state_ranges = 0; 799 atomic_set(&net->ipv6.fib6_sernum, 1); 800 801 err = ipv6_init_mibs(net); 802 if (err) 803 return err; 804 #ifdef CONFIG_PROC_FS 805 err = udp6_proc_init(net); 806 if (err) 807 goto out; 808 err = tcp6_proc_init(net); 809 if (err) 810 goto proc_tcp6_fail; 811 err = ac6_proc_init(net); 812 if (err) 813 goto proc_ac6_fail; 814 #endif 815 return err; 816 817 #ifdef CONFIG_PROC_FS 818 proc_ac6_fail: 819 tcp6_proc_exit(net); 820 proc_tcp6_fail: 821 udp6_proc_exit(net); 822 out: 823 ipv6_cleanup_mibs(net); 824 return err; 825 #endif 826 } 827 828 static void __net_exit inet6_net_exit(struct net *net) 829 { 830 #ifdef CONFIG_PROC_FS 831 udp6_proc_exit(net); 832 tcp6_proc_exit(net); 833 ac6_proc_exit(net); 834 #endif 835 ipv6_cleanup_mibs(net); 836 } 837 838 static struct pernet_operations inet6_net_ops = { 839 .init = inet6_net_init, 840 .exit = inet6_net_exit, 841 }; 842 843 static const struct ipv6_stub ipv6_stub_impl = { 844 .ipv6_sock_mc_join = ipv6_sock_mc_join, 845 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 846 .ipv6_dst_lookup = ip6_dst_lookup, 847 .udpv6_encap_enable = udpv6_encap_enable, 848 .ndisc_send_na = ndisc_send_na, 849 .nd_tbl = &nd_tbl, 850 }; 851 852 static int __init inet6_init(void) 853 { 854 struct list_head *r; 855 int err = 0; 856 857 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 858 859 /* Register the socket-side information for inet6_create. */ 860 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 861 INIT_LIST_HEAD(r); 862 863 if (disable_ipv6_mod) { 864 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 865 goto out; 866 } 867 868 err = proto_register(&tcpv6_prot, 1); 869 if (err) 870 goto out; 871 872 err = proto_register(&udpv6_prot, 1); 873 if (err) 874 goto out_unregister_tcp_proto; 875 876 err = proto_register(&udplitev6_prot, 1); 877 if (err) 878 goto out_unregister_udp_proto; 879 880 err = proto_register(&rawv6_prot, 1); 881 if (err) 882 goto out_unregister_udplite_proto; 883 884 err = proto_register(&pingv6_prot, 1); 885 if (err) 886 goto out_unregister_ping_proto; 887 888 /* We MUST register RAW sockets before we create the ICMP6, 889 * IGMP6, or NDISC control sockets. 890 */ 891 err = rawv6_init(); 892 if (err) 893 goto out_unregister_raw_proto; 894 895 /* Register the family here so that the init calls below will 896 * be able to create sockets. (?? is this dangerous ??) 897 */ 898 err = sock_register(&inet6_family_ops); 899 if (err) 900 goto out_sock_register_fail; 901 902 /* 903 * ipngwg API draft makes clear that the correct semantics 904 * for TCP and UDP is to consider one TCP and UDP instance 905 * in a host available by both INET and INET6 APIs and 906 * able to communicate via both network protocols. 907 */ 908 909 err = register_pernet_subsys(&inet6_net_ops); 910 if (err) 911 goto register_pernet_fail; 912 err = icmpv6_init(); 913 if (err) 914 goto icmp_fail; 915 err = ip6_mr_init(); 916 if (err) 917 goto ipmr_fail; 918 err = ndisc_init(); 919 if (err) 920 goto ndisc_fail; 921 err = igmp6_init(); 922 if (err) 923 goto igmp_fail; 924 925 ipv6_stub = &ipv6_stub_impl; 926 927 err = ipv6_netfilter_init(); 928 if (err) 929 goto netfilter_fail; 930 /* Create /proc/foo6 entries. */ 931 #ifdef CONFIG_PROC_FS 932 err = -ENOMEM; 933 if (raw6_proc_init()) 934 goto proc_raw6_fail; 935 if (udplite6_proc_init()) 936 goto proc_udplite6_fail; 937 if (ipv6_misc_proc_init()) 938 goto proc_misc6_fail; 939 if (if6_proc_init()) 940 goto proc_if6_fail; 941 #endif 942 err = ip6_route_init(); 943 if (err) 944 goto ip6_route_fail; 945 err = ndisc_late_init(); 946 if (err) 947 goto ndisc_late_fail; 948 err = ip6_flowlabel_init(); 949 if (err) 950 goto ip6_flowlabel_fail; 951 err = addrconf_init(); 952 if (err) 953 goto addrconf_fail; 954 955 /* Init v6 extension headers. */ 956 err = ipv6_exthdrs_init(); 957 if (err) 958 goto ipv6_exthdrs_fail; 959 960 err = ipv6_frag_init(); 961 if (err) 962 goto ipv6_frag_fail; 963 964 /* Init v6 transport protocols. */ 965 err = udpv6_init(); 966 if (err) 967 goto udpv6_fail; 968 969 err = udplitev6_init(); 970 if (err) 971 goto udplitev6_fail; 972 973 err = udpv6_offload_init(); 974 if (err) 975 goto udpv6_offload_fail; 976 977 err = tcpv6_init(); 978 if (err) 979 goto tcpv6_fail; 980 981 err = ipv6_packet_init(); 982 if (err) 983 goto ipv6_packet_fail; 984 985 err = pingv6_init(); 986 if (err) 987 goto pingv6_fail; 988 989 err = calipso_init(); 990 if (err) 991 goto calipso_fail; 992 993 #ifdef CONFIG_SYSCTL 994 err = ipv6_sysctl_register(); 995 if (err) 996 goto sysctl_fail; 997 #endif 998 out: 999 return err; 1000 1001 #ifdef CONFIG_SYSCTL 1002 sysctl_fail: 1003 calipso_exit(); 1004 #endif 1005 calipso_fail: 1006 pingv6_exit(); 1007 pingv6_fail: 1008 ipv6_packet_cleanup(); 1009 ipv6_packet_fail: 1010 tcpv6_exit(); 1011 tcpv6_fail: 1012 udpv6_offload_exit(); 1013 udpv6_offload_fail: 1014 udplitev6_exit(); 1015 udplitev6_fail: 1016 udpv6_exit(); 1017 udpv6_fail: 1018 ipv6_frag_exit(); 1019 ipv6_frag_fail: 1020 ipv6_exthdrs_exit(); 1021 ipv6_exthdrs_fail: 1022 addrconf_cleanup(); 1023 addrconf_fail: 1024 ip6_flowlabel_cleanup(); 1025 ip6_flowlabel_fail: 1026 ndisc_late_cleanup(); 1027 ndisc_late_fail: 1028 ip6_route_cleanup(); 1029 ip6_route_fail: 1030 #ifdef CONFIG_PROC_FS 1031 if6_proc_exit(); 1032 proc_if6_fail: 1033 ipv6_misc_proc_exit(); 1034 proc_misc6_fail: 1035 udplite6_proc_exit(); 1036 proc_udplite6_fail: 1037 raw6_proc_exit(); 1038 proc_raw6_fail: 1039 #endif 1040 ipv6_netfilter_fini(); 1041 netfilter_fail: 1042 igmp6_cleanup(); 1043 igmp_fail: 1044 ndisc_cleanup(); 1045 ndisc_fail: 1046 ip6_mr_cleanup(); 1047 ipmr_fail: 1048 icmpv6_cleanup(); 1049 icmp_fail: 1050 unregister_pernet_subsys(&inet6_net_ops); 1051 register_pernet_fail: 1052 sock_unregister(PF_INET6); 1053 rtnl_unregister_all(PF_INET6); 1054 out_sock_register_fail: 1055 rawv6_exit(); 1056 out_unregister_ping_proto: 1057 proto_unregister(&pingv6_prot); 1058 out_unregister_raw_proto: 1059 proto_unregister(&rawv6_prot); 1060 out_unregister_udplite_proto: 1061 proto_unregister(&udplitev6_prot); 1062 out_unregister_udp_proto: 1063 proto_unregister(&udpv6_prot); 1064 out_unregister_tcp_proto: 1065 proto_unregister(&tcpv6_prot); 1066 goto out; 1067 } 1068 module_init(inet6_init); 1069 1070 MODULE_ALIAS_NETPROTO(PF_INET6); 1071