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