1 /* 2 * PF_INET6 socket protocol family 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Adapted from linux/net/ipv4/af_inet.c 9 * 10 * Fixes: 11 * piggy, Karl Knutson : Socket protocol table 12 * Hideaki YOSHIFUJI : sin6_scope_id support 13 * Arnaldo Melo : check proc_net_create return, cleanups 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 */ 20 21 #define pr_fmt(fmt) "IPv6: " fmt 22 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/errno.h> 26 #include <linux/types.h> 27 #include <linux/socket.h> 28 #include <linux/in.h> 29 #include <linux/kernel.h> 30 #include <linux/timer.h> 31 #include <linux/string.h> 32 #include <linux/sockios.h> 33 #include <linux/net.h> 34 #include <linux/fcntl.h> 35 #include <linux/mm.h> 36 #include <linux/interrupt.h> 37 #include <linux/proc_fs.h> 38 #include <linux/stat.h> 39 #include <linux/init.h> 40 #include <linux/slab.h> 41 42 #include <linux/inet.h> 43 #include <linux/netdevice.h> 44 #include <linux/icmpv6.h> 45 #include <linux/netfilter_ipv6.h> 46 47 #include <net/ip.h> 48 #include <net/ipv6.h> 49 #include <net/udp.h> 50 #include <net/udplite.h> 51 #include <net/tcp.h> 52 #include <net/ping.h> 53 #include <net/protocol.h> 54 #include <net/inet_common.h> 55 #include <net/route.h> 56 #include <net/transp_v6.h> 57 #include <net/ip6_route.h> 58 #include <net/addrconf.h> 59 #include <net/ndisc.h> 60 #ifdef CONFIG_IPV6_TUNNEL 61 #include <net/ip6_tunnel.h> 62 #endif 63 64 #include <asm/uaccess.h> 65 #include <linux/mroute6.h> 66 67 MODULE_AUTHOR("Cast of dozens"); 68 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 69 MODULE_LICENSE("GPL"); 70 71 /* The inetsw6 table contains everything that inet6_create needs to 72 * build a new socket. 73 */ 74 static struct list_head inetsw6[SOCK_MAX]; 75 static DEFINE_SPINLOCK(inetsw6_lock); 76 77 struct ipv6_params ipv6_defaults = { 78 .disable_ipv6 = 0, 79 .autoconf = 1, 80 }; 81 82 static int disable_ipv6_mod; 83 84 module_param_named(disable, disable_ipv6_mod, int, 0444); 85 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 86 87 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 88 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 89 90 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 91 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 92 93 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 94 { 95 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 96 97 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 98 } 99 100 static int inet6_create(struct net *net, struct socket *sock, int protocol, 101 int kern) 102 { 103 struct inet_sock *inet; 104 struct ipv6_pinfo *np; 105 struct sock *sk; 106 struct inet_protosw *answer; 107 struct proto *answer_prot; 108 unsigned char answer_flags; 109 int try_loading_module = 0; 110 int err; 111 112 if (protocol < 0 || protocol >= IPPROTO_MAX) 113 return -EINVAL; 114 115 /* Look for the requested type/protocol pair. */ 116 lookup_protocol: 117 err = -ESOCKTNOSUPPORT; 118 rcu_read_lock(); 119 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 120 121 err = 0; 122 /* Check the non-wild match. */ 123 if (protocol == answer->protocol) { 124 if (protocol != IPPROTO_IP) 125 break; 126 } else { 127 /* Check for the two wild cases. */ 128 if (IPPROTO_IP == protocol) { 129 protocol = answer->protocol; 130 break; 131 } 132 if (IPPROTO_IP == answer->protocol) 133 break; 134 } 135 err = -EPROTONOSUPPORT; 136 } 137 138 if (err) { 139 if (try_loading_module < 2) { 140 rcu_read_unlock(); 141 /* 142 * Be more specific, e.g. net-pf-10-proto-132-type-1 143 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 144 */ 145 if (++try_loading_module == 1) 146 request_module("net-pf-%d-proto-%d-type-%d", 147 PF_INET6, protocol, sock->type); 148 /* 149 * Fall back to generic, e.g. net-pf-10-proto-132 150 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 151 */ 152 else 153 request_module("net-pf-%d-proto-%d", 154 PF_INET6, protocol); 155 goto lookup_protocol; 156 } else 157 goto out_rcu_unlock; 158 } 159 160 err = -EPERM; 161 if (sock->type == SOCK_RAW && !kern && 162 !ns_capable(net->user_ns, CAP_NET_RAW)) 163 goto out_rcu_unlock; 164 165 sock->ops = answer->ops; 166 answer_prot = answer->prot; 167 answer_flags = answer->flags; 168 rcu_read_unlock(); 169 170 WARN_ON(!answer_prot->slab); 171 172 err = -ENOBUFS; 173 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 174 if (!sk) 175 goto out; 176 177 sock_init_data(sock, sk); 178 179 err = 0; 180 if (INET_PROTOSW_REUSE & answer_flags) 181 sk->sk_reuse = SK_CAN_REUSE; 182 183 inet = inet_sk(sk); 184 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 185 186 if (SOCK_RAW == sock->type) { 187 inet->inet_num = protocol; 188 if (IPPROTO_RAW == protocol) 189 inet->hdrincl = 1; 190 } 191 192 sk->sk_destruct = inet_sock_destruct; 193 sk->sk_family = PF_INET6; 194 sk->sk_protocol = protocol; 195 196 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 197 198 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 199 np->hop_limit = -1; 200 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 201 np->mc_loop = 1; 202 np->pmtudisc = IPV6_PMTUDISC_WANT; 203 np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk)); 204 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 205 206 /* Init the ipv4 part of the socket since we can have sockets 207 * using v6 API for ipv4. 208 */ 209 inet->uc_ttl = -1; 210 211 inet->mc_loop = 1; 212 inet->mc_ttl = 1; 213 inet->mc_index = 0; 214 inet->mc_list = NULL; 215 inet->rcv_tos = 0; 216 217 if (net->ipv4.sysctl_ip_no_pmtu_disc) 218 inet->pmtudisc = IP_PMTUDISC_DONT; 219 else 220 inet->pmtudisc = IP_PMTUDISC_WANT; 221 /* 222 * Increment only the relevant sk_prot->socks debug field, this changes 223 * the previous behaviour of incrementing both the equivalent to 224 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 225 * 226 * This allows better debug granularity as we'll know exactly how many 227 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 228 * transport protocol socks. -acme 229 */ 230 sk_refcnt_debug_inc(sk); 231 232 if (inet->inet_num) { 233 /* It assumes that any protocol which allows 234 * the user to assign a number at socket 235 * creation time automatically shares. 236 */ 237 inet->inet_sport = htons(inet->inet_num); 238 err = sk->sk_prot->hash(sk); 239 if (err) { 240 sk_common_release(sk); 241 goto out; 242 } 243 } 244 if (sk->sk_prot->init) { 245 err = sk->sk_prot->init(sk); 246 if (err) { 247 sk_common_release(sk); 248 goto out; 249 } 250 } 251 out: 252 return err; 253 out_rcu_unlock: 254 rcu_read_unlock(); 255 goto out; 256 } 257 258 259 /* bind for INET6 API */ 260 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 261 { 262 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 263 struct sock *sk = sock->sk; 264 struct inet_sock *inet = inet_sk(sk); 265 struct ipv6_pinfo *np = inet6_sk(sk); 266 struct net *net = sock_net(sk); 267 __be32 v4addr = 0; 268 unsigned short snum; 269 int addr_type = 0; 270 int err = 0; 271 272 /* If the socket has its own bind function then use it. */ 273 if (sk->sk_prot->bind) 274 return sk->sk_prot->bind(sk, uaddr, addr_len); 275 276 if (addr_len < SIN6_LEN_RFC2133) 277 return -EINVAL; 278 279 if (addr->sin6_family != AF_INET6) 280 return -EAFNOSUPPORT; 281 282 addr_type = ipv6_addr_type(&addr->sin6_addr); 283 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 284 return -EINVAL; 285 286 snum = ntohs(addr->sin6_port); 287 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 288 return -EACCES; 289 290 lock_sock(sk); 291 292 /* Check these errors (active socket, double bind). */ 293 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 294 err = -EINVAL; 295 goto out; 296 } 297 298 /* Check if the address belongs to the host. */ 299 if (addr_type == IPV6_ADDR_MAPPED) { 300 int chk_addr_ret; 301 302 /* Binding to v4-mapped address on a v6-only socket 303 * makes no sense 304 */ 305 if (sk->sk_ipv6only) { 306 err = -EINVAL; 307 goto out; 308 } 309 310 /* Reproduce AF_INET checks to make the bindings consistent */ 311 v4addr = addr->sin6_addr.s6_addr32[3]; 312 chk_addr_ret = inet_addr_type(net, v4addr); 313 if (!net->ipv4.sysctl_ip_nonlocal_bind && 314 !(inet->freebind || inet->transparent) && 315 v4addr != htonl(INADDR_ANY) && 316 chk_addr_ret != RTN_LOCAL && 317 chk_addr_ret != RTN_MULTICAST && 318 chk_addr_ret != RTN_BROADCAST) { 319 err = -EADDRNOTAVAIL; 320 goto out; 321 } 322 } else { 323 if (addr_type != IPV6_ADDR_ANY) { 324 struct net_device *dev = NULL; 325 326 rcu_read_lock(); 327 if (__ipv6_addr_needs_scope_id(addr_type)) { 328 if (addr_len >= sizeof(struct sockaddr_in6) && 329 addr->sin6_scope_id) { 330 /* Override any existing binding, if another one 331 * is supplied by user. 332 */ 333 sk->sk_bound_dev_if = addr->sin6_scope_id; 334 } 335 336 /* Binding to link-local address requires an interface */ 337 if (!sk->sk_bound_dev_if) { 338 err = -EINVAL; 339 goto out_unlock; 340 } 341 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 342 if (!dev) { 343 err = -ENODEV; 344 goto out_unlock; 345 } 346 } 347 348 /* ipv4 addr of the socket is invalid. Only the 349 * unspecified and mapped address have a v4 equivalent. 350 */ 351 v4addr = LOOPBACK4_IPV6; 352 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 353 if (!net->ipv6.sysctl.ip_nonlocal_bind && 354 !(inet->freebind || inet->transparent) && 355 !ipv6_chk_addr(net, &addr->sin6_addr, 356 dev, 0)) { 357 err = -EADDRNOTAVAIL; 358 goto out_unlock; 359 } 360 } 361 rcu_read_unlock(); 362 } 363 } 364 365 inet->inet_rcv_saddr = v4addr; 366 inet->inet_saddr = v4addr; 367 368 sk->sk_v6_rcv_saddr = addr->sin6_addr; 369 370 if (!(addr_type & IPV6_ADDR_MULTICAST)) 371 np->saddr = addr->sin6_addr; 372 373 /* Make sure we are allowed to bind here. */ 374 if ((snum || !inet->bind_address_no_port) && 375 sk->sk_prot->get_port(sk, snum)) { 376 inet_reset_saddr(sk); 377 err = -EADDRINUSE; 378 goto out; 379 } 380 381 if (addr_type != IPV6_ADDR_ANY) { 382 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 383 if (addr_type != IPV6_ADDR_MAPPED) 384 sk->sk_ipv6only = 1; 385 } 386 if (snum) 387 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 388 inet->inet_sport = htons(inet->inet_num); 389 inet->inet_dport = 0; 390 inet->inet_daddr = 0; 391 out: 392 release_sock(sk); 393 return err; 394 out_unlock: 395 rcu_read_unlock(); 396 goto out; 397 } 398 EXPORT_SYMBOL(inet6_bind); 399 400 int inet6_release(struct socket *sock) 401 { 402 struct sock *sk = sock->sk; 403 404 if (!sk) 405 return -EINVAL; 406 407 /* Free mc lists */ 408 ipv6_sock_mc_close(sk); 409 410 /* Free ac lists */ 411 ipv6_sock_ac_close(sk); 412 413 return inet_release(sock); 414 } 415 EXPORT_SYMBOL(inet6_release); 416 417 void inet6_destroy_sock(struct sock *sk) 418 { 419 struct ipv6_pinfo *np = inet6_sk(sk); 420 struct sk_buff *skb; 421 struct ipv6_txoptions *opt; 422 423 /* Release rx options */ 424 425 skb = xchg(&np->pktoptions, NULL); 426 if (skb) 427 kfree_skb(skb); 428 429 skb = xchg(&np->rxpmtu, NULL); 430 if (skb) 431 kfree_skb(skb); 432 433 /* Free flowlabels */ 434 fl6_free_socklist(sk); 435 436 /* Free tx options */ 437 438 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 439 if (opt) { 440 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 441 txopt_put(opt); 442 } 443 } 444 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 445 446 /* 447 * This does both peername and sockname. 448 */ 449 450 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 451 int *uaddr_len, int peer) 452 { 453 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 454 struct sock *sk = sock->sk; 455 struct inet_sock *inet = inet_sk(sk); 456 struct ipv6_pinfo *np = inet6_sk(sk); 457 458 sin->sin6_family = AF_INET6; 459 sin->sin6_flowinfo = 0; 460 sin->sin6_scope_id = 0; 461 if (peer) { 462 if (!inet->inet_dport) 463 return -ENOTCONN; 464 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 465 peer == 1) 466 return -ENOTCONN; 467 sin->sin6_port = inet->inet_dport; 468 sin->sin6_addr = sk->sk_v6_daddr; 469 if (np->sndflow) 470 sin->sin6_flowinfo = np->flow_label; 471 } else { 472 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 473 sin->sin6_addr = np->saddr; 474 else 475 sin->sin6_addr = sk->sk_v6_rcv_saddr; 476 477 sin->sin6_port = inet->inet_sport; 478 } 479 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 480 sk->sk_bound_dev_if); 481 *uaddr_len = sizeof(*sin); 482 return 0; 483 } 484 EXPORT_SYMBOL(inet6_getname); 485 486 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 487 { 488 struct sock *sk = sock->sk; 489 struct net *net = sock_net(sk); 490 491 switch (cmd) { 492 case SIOCGSTAMP: 493 return sock_get_timestamp(sk, (struct timeval __user *)arg); 494 495 case SIOCGSTAMPNS: 496 return sock_get_timestampns(sk, (struct timespec __user *)arg); 497 498 case SIOCADDRT: 499 case SIOCDELRT: 500 501 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 502 503 case SIOCSIFADDR: 504 return addrconf_add_ifaddr(net, (void __user *) arg); 505 case SIOCDIFADDR: 506 return addrconf_del_ifaddr(net, (void __user *) arg); 507 case SIOCSIFDSTADDR: 508 return addrconf_set_dstaddr(net, (void __user *) arg); 509 default: 510 if (!sk->sk_prot->ioctl) 511 return -ENOIOCTLCMD; 512 return sk->sk_prot->ioctl(sk, cmd, arg); 513 } 514 /*NOTREACHED*/ 515 return 0; 516 } 517 EXPORT_SYMBOL(inet6_ioctl); 518 519 const struct proto_ops inet6_stream_ops = { 520 .family = PF_INET6, 521 .owner = THIS_MODULE, 522 .release = inet6_release, 523 .bind = inet6_bind, 524 .connect = inet_stream_connect, /* ok */ 525 .socketpair = sock_no_socketpair, /* a do nothing */ 526 .accept = inet_accept, /* ok */ 527 .getname = inet6_getname, 528 .poll = tcp_poll, /* ok */ 529 .ioctl = inet6_ioctl, /* must change */ 530 .listen = inet_listen, /* ok */ 531 .shutdown = inet_shutdown, /* ok */ 532 .setsockopt = sock_common_setsockopt, /* ok */ 533 .getsockopt = sock_common_getsockopt, /* ok */ 534 .sendmsg = inet_sendmsg, /* ok */ 535 .recvmsg = inet_recvmsg, /* ok */ 536 .mmap = sock_no_mmap, 537 .sendpage = inet_sendpage, 538 .splice_read = tcp_splice_read, 539 #ifdef CONFIG_COMPAT 540 .compat_setsockopt = compat_sock_common_setsockopt, 541 .compat_getsockopt = compat_sock_common_getsockopt, 542 #endif 543 }; 544 545 const struct proto_ops inet6_dgram_ops = { 546 .family = PF_INET6, 547 .owner = THIS_MODULE, 548 .release = inet6_release, 549 .bind = inet6_bind, 550 .connect = inet_dgram_connect, /* ok */ 551 .socketpair = sock_no_socketpair, /* a do nothing */ 552 .accept = sock_no_accept, /* a do nothing */ 553 .getname = inet6_getname, 554 .poll = udp_poll, /* ok */ 555 .ioctl = inet6_ioctl, /* must change */ 556 .listen = sock_no_listen, /* ok */ 557 .shutdown = inet_shutdown, /* ok */ 558 .setsockopt = sock_common_setsockopt, /* ok */ 559 .getsockopt = sock_common_getsockopt, /* ok */ 560 .sendmsg = inet_sendmsg, /* ok */ 561 .recvmsg = inet_recvmsg, /* ok */ 562 .mmap = sock_no_mmap, 563 .sendpage = sock_no_sendpage, 564 #ifdef CONFIG_COMPAT 565 .compat_setsockopt = compat_sock_common_setsockopt, 566 .compat_getsockopt = compat_sock_common_getsockopt, 567 #endif 568 }; 569 570 static const struct net_proto_family inet6_family_ops = { 571 .family = PF_INET6, 572 .create = inet6_create, 573 .owner = THIS_MODULE, 574 }; 575 576 int inet6_register_protosw(struct inet_protosw *p) 577 { 578 struct list_head *lh; 579 struct inet_protosw *answer; 580 struct list_head *last_perm; 581 int protocol = p->protocol; 582 int ret; 583 584 spin_lock_bh(&inetsw6_lock); 585 586 ret = -EINVAL; 587 if (p->type >= SOCK_MAX) 588 goto out_illegal; 589 590 /* If we are trying to override a permanent protocol, bail. */ 591 answer = NULL; 592 ret = -EPERM; 593 last_perm = &inetsw6[p->type]; 594 list_for_each(lh, &inetsw6[p->type]) { 595 answer = list_entry(lh, struct inet_protosw, list); 596 597 /* Check only the non-wild match. */ 598 if (INET_PROTOSW_PERMANENT & answer->flags) { 599 if (protocol == answer->protocol) 600 break; 601 last_perm = lh; 602 } 603 604 answer = NULL; 605 } 606 if (answer) 607 goto out_permanent; 608 609 /* Add the new entry after the last permanent entry if any, so that 610 * the new entry does not override a permanent entry when matched with 611 * a wild-card protocol. But it is allowed to override any existing 612 * non-permanent entry. This means that when we remove this entry, the 613 * system automatically returns to the old behavior. 614 */ 615 list_add_rcu(&p->list, last_perm); 616 ret = 0; 617 out: 618 spin_unlock_bh(&inetsw6_lock); 619 return ret; 620 621 out_permanent: 622 pr_err("Attempt to override permanent protocol %d\n", protocol); 623 goto out; 624 625 out_illegal: 626 pr_err("Ignoring attempt to register invalid socket type %d\n", 627 p->type); 628 goto out; 629 } 630 EXPORT_SYMBOL(inet6_register_protosw); 631 632 void 633 inet6_unregister_protosw(struct inet_protosw *p) 634 { 635 if (INET_PROTOSW_PERMANENT & p->flags) { 636 pr_err("Attempt to unregister permanent protocol %d\n", 637 p->protocol); 638 } else { 639 spin_lock_bh(&inetsw6_lock); 640 list_del_rcu(&p->list); 641 spin_unlock_bh(&inetsw6_lock); 642 643 synchronize_net(); 644 } 645 } 646 EXPORT_SYMBOL(inet6_unregister_protosw); 647 648 int inet6_sk_rebuild_header(struct sock *sk) 649 { 650 struct ipv6_pinfo *np = inet6_sk(sk); 651 struct dst_entry *dst; 652 653 dst = __sk_dst_check(sk, np->dst_cookie); 654 655 if (!dst) { 656 struct inet_sock *inet = inet_sk(sk); 657 struct in6_addr *final_p, final; 658 struct flowi6 fl6; 659 660 memset(&fl6, 0, sizeof(fl6)); 661 fl6.flowi6_proto = sk->sk_protocol; 662 fl6.daddr = sk->sk_v6_daddr; 663 fl6.saddr = np->saddr; 664 fl6.flowlabel = np->flow_label; 665 fl6.flowi6_oif = sk->sk_bound_dev_if; 666 fl6.flowi6_mark = sk->sk_mark; 667 fl6.fl6_dport = inet->inet_dport; 668 fl6.fl6_sport = inet->inet_sport; 669 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 670 671 rcu_read_lock(); 672 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 673 &final); 674 rcu_read_unlock(); 675 676 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 677 if (IS_ERR(dst)) { 678 sk->sk_route_caps = 0; 679 sk->sk_err_soft = -PTR_ERR(dst); 680 return PTR_ERR(dst); 681 } 682 683 ip6_dst_store(sk, dst, NULL, NULL); 684 } 685 686 return 0; 687 } 688 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 689 690 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 691 const struct inet6_skb_parm *opt) 692 { 693 const struct ipv6_pinfo *np = inet6_sk(sk); 694 695 if (np->rxopt.all) { 696 if (((opt->flags & IP6SKB_HOPBYHOP) && 697 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 698 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 699 np->rxopt.bits.rxflow) || 700 (opt->srcrt && (np->rxopt.bits.srcrt || 701 np->rxopt.bits.osrcrt)) || 702 ((opt->dst1 || opt->dst0) && 703 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 704 return true; 705 } 706 return false; 707 } 708 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 709 710 static struct packet_type ipv6_packet_type __read_mostly = { 711 .type = cpu_to_be16(ETH_P_IPV6), 712 .func = ipv6_rcv, 713 }; 714 715 static int __init ipv6_packet_init(void) 716 { 717 dev_add_pack(&ipv6_packet_type); 718 return 0; 719 } 720 721 static void ipv6_packet_cleanup(void) 722 { 723 dev_remove_pack(&ipv6_packet_type); 724 } 725 726 static int __net_init ipv6_init_mibs(struct net *net) 727 { 728 int i; 729 730 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 731 if (!net->mib.udp_stats_in6) 732 return -ENOMEM; 733 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 734 if (!net->mib.udplite_stats_in6) 735 goto err_udplite_mib; 736 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 737 if (!net->mib.ipv6_statistics) 738 goto err_ip_mib; 739 740 for_each_possible_cpu(i) { 741 struct ipstats_mib *af_inet6_stats; 742 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 743 u64_stats_init(&af_inet6_stats->syncp); 744 } 745 746 747 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 748 if (!net->mib.icmpv6_statistics) 749 goto err_icmp_mib; 750 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 751 GFP_KERNEL); 752 if (!net->mib.icmpv6msg_statistics) 753 goto err_icmpmsg_mib; 754 return 0; 755 756 err_icmpmsg_mib: 757 free_percpu(net->mib.icmpv6_statistics); 758 err_icmp_mib: 759 free_percpu(net->mib.ipv6_statistics); 760 err_ip_mib: 761 free_percpu(net->mib.udplite_stats_in6); 762 err_udplite_mib: 763 free_percpu(net->mib.udp_stats_in6); 764 return -ENOMEM; 765 } 766 767 static void ipv6_cleanup_mibs(struct net *net) 768 { 769 free_percpu(net->mib.udp_stats_in6); 770 free_percpu(net->mib.udplite_stats_in6); 771 free_percpu(net->mib.ipv6_statistics); 772 free_percpu(net->mib.icmpv6_statistics); 773 kfree(net->mib.icmpv6msg_statistics); 774 } 775 776 static int __net_init inet6_net_init(struct net *net) 777 { 778 int err = 0; 779 780 net->ipv6.sysctl.bindv6only = 0; 781 net->ipv6.sysctl.icmpv6_time = 1*HZ; 782 net->ipv6.sysctl.flowlabel_consistency = 1; 783 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 784 net->ipv6.sysctl.idgen_retries = 3; 785 net->ipv6.sysctl.idgen_delay = 1 * HZ; 786 net->ipv6.sysctl.flowlabel_state_ranges = 0; 787 atomic_set(&net->ipv6.fib6_sernum, 1); 788 789 err = ipv6_init_mibs(net); 790 if (err) 791 return err; 792 #ifdef CONFIG_PROC_FS 793 err = udp6_proc_init(net); 794 if (err) 795 goto out; 796 err = tcp6_proc_init(net); 797 if (err) 798 goto proc_tcp6_fail; 799 err = ac6_proc_init(net); 800 if (err) 801 goto proc_ac6_fail; 802 #endif 803 return err; 804 805 #ifdef CONFIG_PROC_FS 806 proc_ac6_fail: 807 tcp6_proc_exit(net); 808 proc_tcp6_fail: 809 udp6_proc_exit(net); 810 out: 811 ipv6_cleanup_mibs(net); 812 return err; 813 #endif 814 } 815 816 static void __net_exit inet6_net_exit(struct net *net) 817 { 818 #ifdef CONFIG_PROC_FS 819 udp6_proc_exit(net); 820 tcp6_proc_exit(net); 821 ac6_proc_exit(net); 822 #endif 823 ipv6_cleanup_mibs(net); 824 } 825 826 static struct pernet_operations inet6_net_ops = { 827 .init = inet6_net_init, 828 .exit = inet6_net_exit, 829 }; 830 831 static const struct ipv6_stub ipv6_stub_impl = { 832 .ipv6_sock_mc_join = ipv6_sock_mc_join, 833 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 834 .ipv6_dst_lookup = ip6_dst_lookup, 835 .udpv6_encap_enable = udpv6_encap_enable, 836 .ndisc_send_na = ndisc_send_na, 837 .nd_tbl = &nd_tbl, 838 }; 839 840 static int __init inet6_init(void) 841 { 842 struct list_head *r; 843 int err = 0; 844 845 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 846 847 /* Register the socket-side information for inet6_create. */ 848 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 849 INIT_LIST_HEAD(r); 850 851 if (disable_ipv6_mod) { 852 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 853 goto out; 854 } 855 856 err = proto_register(&tcpv6_prot, 1); 857 if (err) 858 goto out; 859 860 err = proto_register(&udpv6_prot, 1); 861 if (err) 862 goto out_unregister_tcp_proto; 863 864 err = proto_register(&udplitev6_prot, 1); 865 if (err) 866 goto out_unregister_udp_proto; 867 868 err = proto_register(&rawv6_prot, 1); 869 if (err) 870 goto out_unregister_udplite_proto; 871 872 err = proto_register(&pingv6_prot, 1); 873 if (err) 874 goto out_unregister_ping_proto; 875 876 /* We MUST register RAW sockets before we create the ICMP6, 877 * IGMP6, or NDISC control sockets. 878 */ 879 err = rawv6_init(); 880 if (err) 881 goto out_unregister_raw_proto; 882 883 /* Register the family here so that the init calls below will 884 * be able to create sockets. (?? is this dangerous ??) 885 */ 886 err = sock_register(&inet6_family_ops); 887 if (err) 888 goto out_sock_register_fail; 889 890 /* 891 * ipngwg API draft makes clear that the correct semantics 892 * for TCP and UDP is to consider one TCP and UDP instance 893 * in a host available by both INET and INET6 APIs and 894 * able to communicate via both network protocols. 895 */ 896 897 err = register_pernet_subsys(&inet6_net_ops); 898 if (err) 899 goto register_pernet_fail; 900 err = icmpv6_init(); 901 if (err) 902 goto icmp_fail; 903 err = ip6_mr_init(); 904 if (err) 905 goto ipmr_fail; 906 err = ndisc_init(); 907 if (err) 908 goto ndisc_fail; 909 err = igmp6_init(); 910 if (err) 911 goto igmp_fail; 912 913 ipv6_stub = &ipv6_stub_impl; 914 915 err = ipv6_netfilter_init(); 916 if (err) 917 goto netfilter_fail; 918 /* Create /proc/foo6 entries. */ 919 #ifdef CONFIG_PROC_FS 920 err = -ENOMEM; 921 if (raw6_proc_init()) 922 goto proc_raw6_fail; 923 if (udplite6_proc_init()) 924 goto proc_udplite6_fail; 925 if (ipv6_misc_proc_init()) 926 goto proc_misc6_fail; 927 if (if6_proc_init()) 928 goto proc_if6_fail; 929 #endif 930 err = ip6_route_init(); 931 if (err) 932 goto ip6_route_fail; 933 err = ndisc_late_init(); 934 if (err) 935 goto ndisc_late_fail; 936 err = ip6_flowlabel_init(); 937 if (err) 938 goto ip6_flowlabel_fail; 939 err = addrconf_init(); 940 if (err) 941 goto addrconf_fail; 942 943 /* Init v6 extension headers. */ 944 err = ipv6_exthdrs_init(); 945 if (err) 946 goto ipv6_exthdrs_fail; 947 948 err = ipv6_frag_init(); 949 if (err) 950 goto ipv6_frag_fail; 951 952 /* Init v6 transport protocols. */ 953 err = udpv6_init(); 954 if (err) 955 goto udpv6_fail; 956 957 err = udplitev6_init(); 958 if (err) 959 goto udplitev6_fail; 960 961 err = tcpv6_init(); 962 if (err) 963 goto tcpv6_fail; 964 965 err = ipv6_packet_init(); 966 if (err) 967 goto ipv6_packet_fail; 968 969 err = pingv6_init(); 970 if (err) 971 goto pingv6_fail; 972 973 #ifdef CONFIG_SYSCTL 974 err = ipv6_sysctl_register(); 975 if (err) 976 goto sysctl_fail; 977 #endif 978 out: 979 return err; 980 981 #ifdef CONFIG_SYSCTL 982 sysctl_fail: 983 pingv6_exit(); 984 #endif 985 pingv6_fail: 986 ipv6_packet_cleanup(); 987 ipv6_packet_fail: 988 tcpv6_exit(); 989 tcpv6_fail: 990 udplitev6_exit(); 991 udplitev6_fail: 992 udpv6_exit(); 993 udpv6_fail: 994 ipv6_frag_exit(); 995 ipv6_frag_fail: 996 ipv6_exthdrs_exit(); 997 ipv6_exthdrs_fail: 998 addrconf_cleanup(); 999 addrconf_fail: 1000 ip6_flowlabel_cleanup(); 1001 ip6_flowlabel_fail: 1002 ndisc_late_cleanup(); 1003 ndisc_late_fail: 1004 ip6_route_cleanup(); 1005 ip6_route_fail: 1006 #ifdef CONFIG_PROC_FS 1007 if6_proc_exit(); 1008 proc_if6_fail: 1009 ipv6_misc_proc_exit(); 1010 proc_misc6_fail: 1011 udplite6_proc_exit(); 1012 proc_udplite6_fail: 1013 raw6_proc_exit(); 1014 proc_raw6_fail: 1015 #endif 1016 ipv6_netfilter_fini(); 1017 netfilter_fail: 1018 igmp6_cleanup(); 1019 igmp_fail: 1020 ndisc_cleanup(); 1021 ndisc_fail: 1022 ip6_mr_cleanup(); 1023 ipmr_fail: 1024 icmpv6_cleanup(); 1025 icmp_fail: 1026 unregister_pernet_subsys(&inet6_net_ops); 1027 register_pernet_fail: 1028 sock_unregister(PF_INET6); 1029 rtnl_unregister_all(PF_INET6); 1030 out_sock_register_fail: 1031 rawv6_exit(); 1032 out_unregister_ping_proto: 1033 proto_unregister(&pingv6_prot); 1034 out_unregister_raw_proto: 1035 proto_unregister(&rawv6_prot); 1036 out_unregister_udplite_proto: 1037 proto_unregister(&udplitev6_prot); 1038 out_unregister_udp_proto: 1039 proto_unregister(&udpv6_prot); 1040 out_unregister_tcp_proto: 1041 proto_unregister(&tcpv6_prot); 1042 goto out; 1043 } 1044 module_init(inet6_init); 1045 1046 MODULE_ALIAS_NETPROTO(PF_INET6); 1047