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(&np->opt, NULL); 432 if (opt) 433 sock_kfree_s(sk, opt, opt->tot_len); 434 } 435 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 436 437 /* 438 * This does both peername and sockname. 439 */ 440 441 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 442 int *uaddr_len, int peer) 443 { 444 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 445 struct sock *sk = sock->sk; 446 struct inet_sock *inet = inet_sk(sk); 447 struct ipv6_pinfo *np = inet6_sk(sk); 448 449 sin->sin6_family = AF_INET6; 450 sin->sin6_flowinfo = 0; 451 sin->sin6_scope_id = 0; 452 if (peer) { 453 if (!inet->inet_dport) 454 return -ENOTCONN; 455 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 456 peer == 1) 457 return -ENOTCONN; 458 sin->sin6_port = inet->inet_dport; 459 sin->sin6_addr = sk->sk_v6_daddr; 460 if (np->sndflow) 461 sin->sin6_flowinfo = np->flow_label; 462 } else { 463 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 464 sin->sin6_addr = np->saddr; 465 else 466 sin->sin6_addr = sk->sk_v6_rcv_saddr; 467 468 sin->sin6_port = inet->inet_sport; 469 } 470 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 471 sk->sk_bound_dev_if); 472 *uaddr_len = sizeof(*sin); 473 return 0; 474 } 475 EXPORT_SYMBOL(inet6_getname); 476 477 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 478 { 479 struct sock *sk = sock->sk; 480 struct net *net = sock_net(sk); 481 482 switch (cmd) { 483 case SIOCGSTAMP: 484 return sock_get_timestamp(sk, (struct timeval __user *)arg); 485 486 case SIOCGSTAMPNS: 487 return sock_get_timestampns(sk, (struct timespec __user *)arg); 488 489 case SIOCADDRT: 490 case SIOCDELRT: 491 492 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 493 494 case SIOCSIFADDR: 495 return addrconf_add_ifaddr(net, (void __user *) arg); 496 case SIOCDIFADDR: 497 return addrconf_del_ifaddr(net, (void __user *) arg); 498 case SIOCSIFDSTADDR: 499 return addrconf_set_dstaddr(net, (void __user *) arg); 500 default: 501 if (!sk->sk_prot->ioctl) 502 return -ENOIOCTLCMD; 503 return sk->sk_prot->ioctl(sk, cmd, arg); 504 } 505 /*NOTREACHED*/ 506 return 0; 507 } 508 EXPORT_SYMBOL(inet6_ioctl); 509 510 const struct proto_ops inet6_stream_ops = { 511 .family = PF_INET6, 512 .owner = THIS_MODULE, 513 .release = inet6_release, 514 .bind = inet6_bind, 515 .connect = inet_stream_connect, /* ok */ 516 .socketpair = sock_no_socketpair, /* a do nothing */ 517 .accept = inet_accept, /* ok */ 518 .getname = inet6_getname, 519 .poll = tcp_poll, /* ok */ 520 .ioctl = inet6_ioctl, /* must change */ 521 .listen = inet_listen, /* ok */ 522 .shutdown = inet_shutdown, /* ok */ 523 .setsockopt = sock_common_setsockopt, /* ok */ 524 .getsockopt = sock_common_getsockopt, /* ok */ 525 .sendmsg = inet_sendmsg, /* ok */ 526 .recvmsg = inet_recvmsg, /* ok */ 527 .mmap = sock_no_mmap, 528 .sendpage = inet_sendpage, 529 .splice_read = tcp_splice_read, 530 #ifdef CONFIG_COMPAT 531 .compat_setsockopt = compat_sock_common_setsockopt, 532 .compat_getsockopt = compat_sock_common_getsockopt, 533 #endif 534 }; 535 536 const struct proto_ops inet6_dgram_ops = { 537 .family = PF_INET6, 538 .owner = THIS_MODULE, 539 .release = inet6_release, 540 .bind = inet6_bind, 541 .connect = inet_dgram_connect, /* ok */ 542 .socketpair = sock_no_socketpair, /* a do nothing */ 543 .accept = sock_no_accept, /* a do nothing */ 544 .getname = inet6_getname, 545 .poll = udp_poll, /* ok */ 546 .ioctl = inet6_ioctl, /* must change */ 547 .listen = sock_no_listen, /* ok */ 548 .shutdown = inet_shutdown, /* ok */ 549 .setsockopt = sock_common_setsockopt, /* ok */ 550 .getsockopt = sock_common_getsockopt, /* ok */ 551 .sendmsg = inet_sendmsg, /* ok */ 552 .recvmsg = inet_recvmsg, /* ok */ 553 .mmap = sock_no_mmap, 554 .sendpage = sock_no_sendpage, 555 #ifdef CONFIG_COMPAT 556 .compat_setsockopt = compat_sock_common_setsockopt, 557 .compat_getsockopt = compat_sock_common_getsockopt, 558 #endif 559 }; 560 561 static const struct net_proto_family inet6_family_ops = { 562 .family = PF_INET6, 563 .create = inet6_create, 564 .owner = THIS_MODULE, 565 }; 566 567 int inet6_register_protosw(struct inet_protosw *p) 568 { 569 struct list_head *lh; 570 struct inet_protosw *answer; 571 struct list_head *last_perm; 572 int protocol = p->protocol; 573 int ret; 574 575 spin_lock_bh(&inetsw6_lock); 576 577 ret = -EINVAL; 578 if (p->type >= SOCK_MAX) 579 goto out_illegal; 580 581 /* If we are trying to override a permanent protocol, bail. */ 582 answer = NULL; 583 ret = -EPERM; 584 last_perm = &inetsw6[p->type]; 585 list_for_each(lh, &inetsw6[p->type]) { 586 answer = list_entry(lh, struct inet_protosw, list); 587 588 /* Check only the non-wild match. */ 589 if (INET_PROTOSW_PERMANENT & answer->flags) { 590 if (protocol == answer->protocol) 591 break; 592 last_perm = lh; 593 } 594 595 answer = NULL; 596 } 597 if (answer) 598 goto out_permanent; 599 600 /* Add the new entry after the last permanent entry if any, so that 601 * the new entry does not override a permanent entry when matched with 602 * a wild-card protocol. But it is allowed to override any existing 603 * non-permanent entry. This means that when we remove this entry, the 604 * system automatically returns to the old behavior. 605 */ 606 list_add_rcu(&p->list, last_perm); 607 ret = 0; 608 out: 609 spin_unlock_bh(&inetsw6_lock); 610 return ret; 611 612 out_permanent: 613 pr_err("Attempt to override permanent protocol %d\n", protocol); 614 goto out; 615 616 out_illegal: 617 pr_err("Ignoring attempt to register invalid socket type %d\n", 618 p->type); 619 goto out; 620 } 621 EXPORT_SYMBOL(inet6_register_protosw); 622 623 void 624 inet6_unregister_protosw(struct inet_protosw *p) 625 { 626 if (INET_PROTOSW_PERMANENT & p->flags) { 627 pr_err("Attempt to unregister permanent protocol %d\n", 628 p->protocol); 629 } else { 630 spin_lock_bh(&inetsw6_lock); 631 list_del_rcu(&p->list); 632 spin_unlock_bh(&inetsw6_lock); 633 634 synchronize_net(); 635 } 636 } 637 EXPORT_SYMBOL(inet6_unregister_protosw); 638 639 int inet6_sk_rebuild_header(struct sock *sk) 640 { 641 struct ipv6_pinfo *np = inet6_sk(sk); 642 struct dst_entry *dst; 643 644 dst = __sk_dst_check(sk, np->dst_cookie); 645 646 if (!dst) { 647 struct inet_sock *inet = inet_sk(sk); 648 struct in6_addr *final_p, final; 649 struct flowi6 fl6; 650 651 memset(&fl6, 0, sizeof(fl6)); 652 fl6.flowi6_proto = sk->sk_protocol; 653 fl6.daddr = sk->sk_v6_daddr; 654 fl6.saddr = np->saddr; 655 fl6.flowlabel = np->flow_label; 656 fl6.flowi6_oif = sk->sk_bound_dev_if; 657 fl6.flowi6_mark = sk->sk_mark; 658 fl6.fl6_dport = inet->inet_dport; 659 fl6.fl6_sport = inet->inet_sport; 660 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 661 662 final_p = fl6_update_dst(&fl6, np->opt, &final); 663 664 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 665 if (IS_ERR(dst)) { 666 sk->sk_route_caps = 0; 667 sk->sk_err_soft = -PTR_ERR(dst); 668 return PTR_ERR(dst); 669 } 670 671 __ip6_dst_store(sk, dst, NULL, NULL); 672 } 673 674 return 0; 675 } 676 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 677 678 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 679 const struct inet6_skb_parm *opt) 680 { 681 const struct ipv6_pinfo *np = inet6_sk(sk); 682 683 if (np->rxopt.all) { 684 if (((opt->flags & IP6SKB_HOPBYHOP) && 685 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 686 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 687 np->rxopt.bits.rxflow) || 688 (opt->srcrt && (np->rxopt.bits.srcrt || 689 np->rxopt.bits.osrcrt)) || 690 ((opt->dst1 || opt->dst0) && 691 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 692 return true; 693 } 694 return false; 695 } 696 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 697 698 static struct packet_type ipv6_packet_type __read_mostly = { 699 .type = cpu_to_be16(ETH_P_IPV6), 700 .func = ipv6_rcv, 701 }; 702 703 static int __init ipv6_packet_init(void) 704 { 705 dev_add_pack(&ipv6_packet_type); 706 return 0; 707 } 708 709 static void ipv6_packet_cleanup(void) 710 { 711 dev_remove_pack(&ipv6_packet_type); 712 } 713 714 static int __net_init ipv6_init_mibs(struct net *net) 715 { 716 int i; 717 718 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 719 if (!net->mib.udp_stats_in6) 720 return -ENOMEM; 721 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 722 if (!net->mib.udplite_stats_in6) 723 goto err_udplite_mib; 724 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 725 if (!net->mib.ipv6_statistics) 726 goto err_ip_mib; 727 728 for_each_possible_cpu(i) { 729 struct ipstats_mib *af_inet6_stats; 730 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 731 u64_stats_init(&af_inet6_stats->syncp); 732 } 733 734 735 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 736 if (!net->mib.icmpv6_statistics) 737 goto err_icmp_mib; 738 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 739 GFP_KERNEL); 740 if (!net->mib.icmpv6msg_statistics) 741 goto err_icmpmsg_mib; 742 return 0; 743 744 err_icmpmsg_mib: 745 free_percpu(net->mib.icmpv6_statistics); 746 err_icmp_mib: 747 free_percpu(net->mib.ipv6_statistics); 748 err_ip_mib: 749 free_percpu(net->mib.udplite_stats_in6); 750 err_udplite_mib: 751 free_percpu(net->mib.udp_stats_in6); 752 return -ENOMEM; 753 } 754 755 static void ipv6_cleanup_mibs(struct net *net) 756 { 757 free_percpu(net->mib.udp_stats_in6); 758 free_percpu(net->mib.udplite_stats_in6); 759 free_percpu(net->mib.ipv6_statistics); 760 free_percpu(net->mib.icmpv6_statistics); 761 kfree(net->mib.icmpv6msg_statistics); 762 } 763 764 static int __net_init inet6_net_init(struct net *net) 765 { 766 int err = 0; 767 768 net->ipv6.sysctl.bindv6only = 0; 769 net->ipv6.sysctl.icmpv6_time = 1*HZ; 770 net->ipv6.sysctl.flowlabel_consistency = 1; 771 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 772 net->ipv6.sysctl.idgen_retries = 3; 773 net->ipv6.sysctl.idgen_delay = 1 * HZ; 774 net->ipv6.sysctl.flowlabel_state_ranges = 0; 775 atomic_set(&net->ipv6.fib6_sernum, 1); 776 777 err = ipv6_init_mibs(net); 778 if (err) 779 return err; 780 #ifdef CONFIG_PROC_FS 781 err = udp6_proc_init(net); 782 if (err) 783 goto out; 784 err = tcp6_proc_init(net); 785 if (err) 786 goto proc_tcp6_fail; 787 err = ac6_proc_init(net); 788 if (err) 789 goto proc_ac6_fail; 790 #endif 791 return err; 792 793 #ifdef CONFIG_PROC_FS 794 proc_ac6_fail: 795 tcp6_proc_exit(net); 796 proc_tcp6_fail: 797 udp6_proc_exit(net); 798 out: 799 ipv6_cleanup_mibs(net); 800 return err; 801 #endif 802 } 803 804 static void __net_exit inet6_net_exit(struct net *net) 805 { 806 #ifdef CONFIG_PROC_FS 807 udp6_proc_exit(net); 808 tcp6_proc_exit(net); 809 ac6_proc_exit(net); 810 #endif 811 ipv6_cleanup_mibs(net); 812 } 813 814 static struct pernet_operations inet6_net_ops = { 815 .init = inet6_net_init, 816 .exit = inet6_net_exit, 817 }; 818 819 static const struct ipv6_stub ipv6_stub_impl = { 820 .ipv6_sock_mc_join = ipv6_sock_mc_join, 821 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 822 .ipv6_dst_lookup = ip6_dst_lookup, 823 .udpv6_encap_enable = udpv6_encap_enable, 824 .ndisc_send_na = ndisc_send_na, 825 .nd_tbl = &nd_tbl, 826 }; 827 828 static int __init inet6_init(void) 829 { 830 struct list_head *r; 831 int err = 0; 832 833 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 834 835 /* Register the socket-side information for inet6_create. */ 836 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 837 INIT_LIST_HEAD(r); 838 839 if (disable_ipv6_mod) { 840 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 841 goto out; 842 } 843 844 err = proto_register(&tcpv6_prot, 1); 845 if (err) 846 goto out; 847 848 err = proto_register(&udpv6_prot, 1); 849 if (err) 850 goto out_unregister_tcp_proto; 851 852 err = proto_register(&udplitev6_prot, 1); 853 if (err) 854 goto out_unregister_udp_proto; 855 856 err = proto_register(&rawv6_prot, 1); 857 if (err) 858 goto out_unregister_udplite_proto; 859 860 err = proto_register(&pingv6_prot, 1); 861 if (err) 862 goto out_unregister_ping_proto; 863 864 /* We MUST register RAW sockets before we create the ICMP6, 865 * IGMP6, or NDISC control sockets. 866 */ 867 err = rawv6_init(); 868 if (err) 869 goto out_unregister_raw_proto; 870 871 /* Register the family here so that the init calls below will 872 * be able to create sockets. (?? is this dangerous ??) 873 */ 874 err = sock_register(&inet6_family_ops); 875 if (err) 876 goto out_sock_register_fail; 877 878 /* 879 * ipngwg API draft makes clear that the correct semantics 880 * for TCP and UDP is to consider one TCP and UDP instance 881 * in a host available by both INET and INET6 APIs and 882 * able to communicate via both network protocols. 883 */ 884 885 err = register_pernet_subsys(&inet6_net_ops); 886 if (err) 887 goto register_pernet_fail; 888 err = icmpv6_init(); 889 if (err) 890 goto icmp_fail; 891 err = ip6_mr_init(); 892 if (err) 893 goto ipmr_fail; 894 err = ndisc_init(); 895 if (err) 896 goto ndisc_fail; 897 err = igmp6_init(); 898 if (err) 899 goto igmp_fail; 900 901 ipv6_stub = &ipv6_stub_impl; 902 903 err = ipv6_netfilter_init(); 904 if (err) 905 goto netfilter_fail; 906 /* Create /proc/foo6 entries. */ 907 #ifdef CONFIG_PROC_FS 908 err = -ENOMEM; 909 if (raw6_proc_init()) 910 goto proc_raw6_fail; 911 if (udplite6_proc_init()) 912 goto proc_udplite6_fail; 913 if (ipv6_misc_proc_init()) 914 goto proc_misc6_fail; 915 if (if6_proc_init()) 916 goto proc_if6_fail; 917 #endif 918 err = ip6_route_init(); 919 if (err) 920 goto ip6_route_fail; 921 err = ndisc_late_init(); 922 if (err) 923 goto ndisc_late_fail; 924 err = ip6_flowlabel_init(); 925 if (err) 926 goto ip6_flowlabel_fail; 927 err = addrconf_init(); 928 if (err) 929 goto addrconf_fail; 930 931 /* Init v6 extension headers. */ 932 err = ipv6_exthdrs_init(); 933 if (err) 934 goto ipv6_exthdrs_fail; 935 936 err = ipv6_frag_init(); 937 if (err) 938 goto ipv6_frag_fail; 939 940 /* Init v6 transport protocols. */ 941 err = udpv6_init(); 942 if (err) 943 goto udpv6_fail; 944 945 err = udplitev6_init(); 946 if (err) 947 goto udplitev6_fail; 948 949 err = tcpv6_init(); 950 if (err) 951 goto tcpv6_fail; 952 953 err = ipv6_packet_init(); 954 if (err) 955 goto ipv6_packet_fail; 956 957 err = pingv6_init(); 958 if (err) 959 goto pingv6_fail; 960 961 #ifdef CONFIG_SYSCTL 962 err = ipv6_sysctl_register(); 963 if (err) 964 goto sysctl_fail; 965 #endif 966 out: 967 return err; 968 969 #ifdef CONFIG_SYSCTL 970 sysctl_fail: 971 pingv6_exit(); 972 #endif 973 pingv6_fail: 974 ipv6_packet_cleanup(); 975 ipv6_packet_fail: 976 tcpv6_exit(); 977 tcpv6_fail: 978 udplitev6_exit(); 979 udplitev6_fail: 980 udpv6_exit(); 981 udpv6_fail: 982 ipv6_frag_exit(); 983 ipv6_frag_fail: 984 ipv6_exthdrs_exit(); 985 ipv6_exthdrs_fail: 986 addrconf_cleanup(); 987 addrconf_fail: 988 ip6_flowlabel_cleanup(); 989 ip6_flowlabel_fail: 990 ndisc_late_cleanup(); 991 ndisc_late_fail: 992 ip6_route_cleanup(); 993 ip6_route_fail: 994 #ifdef CONFIG_PROC_FS 995 if6_proc_exit(); 996 proc_if6_fail: 997 ipv6_misc_proc_exit(); 998 proc_misc6_fail: 999 udplite6_proc_exit(); 1000 proc_udplite6_fail: 1001 raw6_proc_exit(); 1002 proc_raw6_fail: 1003 #endif 1004 ipv6_netfilter_fini(); 1005 netfilter_fail: 1006 igmp6_cleanup(); 1007 igmp_fail: 1008 ndisc_cleanup(); 1009 ndisc_fail: 1010 ip6_mr_cleanup(); 1011 ipmr_fail: 1012 icmpv6_cleanup(); 1013 icmp_fail: 1014 unregister_pernet_subsys(&inet6_net_ops); 1015 register_pernet_fail: 1016 sock_unregister(PF_INET6); 1017 rtnl_unregister_all(PF_INET6); 1018 out_sock_register_fail: 1019 rawv6_exit(); 1020 out_unregister_ping_proto: 1021 proto_unregister(&pingv6_prot); 1022 out_unregister_raw_proto: 1023 proto_unregister(&rawv6_prot); 1024 out_unregister_udplite_proto: 1025 proto_unregister(&udplitev6_prot); 1026 out_unregister_udp_proto: 1027 proto_unregister(&udpv6_prot); 1028 out_unregister_tcp_proto: 1029 proto_unregister(&tcpv6_prot); 1030 goto out; 1031 } 1032 module_init(inet6_init); 1033 1034 MODULE_ALIAS_NETPROTO(PF_INET6); 1035