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 == NULL); 168 169 err = -ENOBUFS; 170 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 171 if (sk == NULL) 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 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 201 202 /* Init the ipv4 part of the socket since we can have sockets 203 * using v6 API for ipv4. 204 */ 205 inet->uc_ttl = -1; 206 207 inet->mc_loop = 1; 208 inet->mc_ttl = 1; 209 inet->mc_index = 0; 210 inet->mc_list = NULL; 211 inet->rcv_tos = 0; 212 213 if (net->ipv4.sysctl_ip_no_pmtu_disc) 214 inet->pmtudisc = IP_PMTUDISC_DONT; 215 else 216 inet->pmtudisc = IP_PMTUDISC_WANT; 217 /* 218 * Increment only the relevant sk_prot->socks debug field, this changes 219 * the previous behaviour of incrementing both the equivalent to 220 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 221 * 222 * This allows better debug granularity as we'll know exactly how many 223 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 224 * transport protocol socks. -acme 225 */ 226 sk_refcnt_debug_inc(sk); 227 228 if (inet->inet_num) { 229 /* It assumes that any protocol which allows 230 * the user to assign a number at socket 231 * creation time automatically shares. 232 */ 233 inet->inet_sport = htons(inet->inet_num); 234 sk->sk_prot->hash(sk); 235 } 236 if (sk->sk_prot->init) { 237 err = sk->sk_prot->init(sk); 238 if (err) { 239 sk_common_release(sk); 240 goto out; 241 } 242 } 243 out: 244 return err; 245 out_rcu_unlock: 246 rcu_read_unlock(); 247 goto out; 248 } 249 250 251 /* bind for INET6 API */ 252 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 253 { 254 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 255 struct sock *sk = sock->sk; 256 struct inet_sock *inet = inet_sk(sk); 257 struct ipv6_pinfo *np = inet6_sk(sk); 258 struct net *net = sock_net(sk); 259 __be32 v4addr = 0; 260 unsigned short snum; 261 int addr_type = 0; 262 int err = 0; 263 264 /* If the socket has its own bind function then use it. */ 265 if (sk->sk_prot->bind) 266 return sk->sk_prot->bind(sk, uaddr, addr_len); 267 268 if (addr_len < SIN6_LEN_RFC2133) 269 return -EINVAL; 270 271 if (addr->sin6_family != AF_INET6) 272 return -EAFNOSUPPORT; 273 274 addr_type = ipv6_addr_type(&addr->sin6_addr); 275 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 276 return -EINVAL; 277 278 snum = ntohs(addr->sin6_port); 279 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 280 return -EACCES; 281 282 lock_sock(sk); 283 284 /* Check these errors (active socket, double bind). */ 285 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 286 err = -EINVAL; 287 goto out; 288 } 289 290 /* Check if the address belongs to the host. */ 291 if (addr_type == IPV6_ADDR_MAPPED) { 292 int chk_addr_ret; 293 294 /* Binding to v4-mapped address on a v6-only socket 295 * makes no sense 296 */ 297 if (sk->sk_ipv6only) { 298 err = -EINVAL; 299 goto out; 300 } 301 302 /* Reproduce AF_INET checks to make the bindings consistent */ 303 v4addr = addr->sin6_addr.s6_addr32[3]; 304 chk_addr_ret = inet_addr_type(net, v4addr); 305 if (!net->ipv4.sysctl_ip_nonlocal_bind && 306 !(inet->freebind || inet->transparent) && 307 v4addr != htonl(INADDR_ANY) && 308 chk_addr_ret != RTN_LOCAL && 309 chk_addr_ret != RTN_MULTICAST && 310 chk_addr_ret != RTN_BROADCAST) { 311 err = -EADDRNOTAVAIL; 312 goto out; 313 } 314 } else { 315 if (addr_type != IPV6_ADDR_ANY) { 316 struct net_device *dev = NULL; 317 318 rcu_read_lock(); 319 if (__ipv6_addr_needs_scope_id(addr_type)) { 320 if (addr_len >= sizeof(struct sockaddr_in6) && 321 addr->sin6_scope_id) { 322 /* Override any existing binding, if another one 323 * is supplied by user. 324 */ 325 sk->sk_bound_dev_if = addr->sin6_scope_id; 326 } 327 328 /* Binding to link-local address requires an interface */ 329 if (!sk->sk_bound_dev_if) { 330 err = -EINVAL; 331 goto out_unlock; 332 } 333 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 334 if (!dev) { 335 err = -ENODEV; 336 goto out_unlock; 337 } 338 } 339 340 /* ipv4 addr of the socket is invalid. Only the 341 * unspecified and mapped address have a v4 equivalent. 342 */ 343 v4addr = LOOPBACK4_IPV6; 344 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 345 if (!(inet->freebind || inet->transparent) && 346 !ipv6_chk_addr(net, &addr->sin6_addr, 347 dev, 0)) { 348 err = -EADDRNOTAVAIL; 349 goto out_unlock; 350 } 351 } 352 rcu_read_unlock(); 353 } 354 } 355 356 inet->inet_rcv_saddr = v4addr; 357 inet->inet_saddr = v4addr; 358 359 sk->sk_v6_rcv_saddr = addr->sin6_addr; 360 361 if (!(addr_type & IPV6_ADDR_MULTICAST)) 362 np->saddr = addr->sin6_addr; 363 364 /* Make sure we are allowed to bind here. */ 365 if (sk->sk_prot->get_port(sk, snum)) { 366 inet_reset_saddr(sk); 367 err = -EADDRINUSE; 368 goto out; 369 } 370 371 if (addr_type != IPV6_ADDR_ANY) { 372 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 373 if (addr_type != IPV6_ADDR_MAPPED) 374 sk->sk_ipv6only = 1; 375 } 376 if (snum) 377 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 378 inet->inet_sport = htons(inet->inet_num); 379 inet->inet_dport = 0; 380 inet->inet_daddr = 0; 381 out: 382 release_sock(sk); 383 return err; 384 out_unlock: 385 rcu_read_unlock(); 386 goto out; 387 } 388 EXPORT_SYMBOL(inet6_bind); 389 390 int inet6_release(struct socket *sock) 391 { 392 struct sock *sk = sock->sk; 393 394 if (sk == NULL) 395 return -EINVAL; 396 397 /* Free mc lists */ 398 ipv6_sock_mc_close(sk); 399 400 /* Free ac lists */ 401 ipv6_sock_ac_close(sk); 402 403 return inet_release(sock); 404 } 405 EXPORT_SYMBOL(inet6_release); 406 407 void inet6_destroy_sock(struct sock *sk) 408 { 409 struct ipv6_pinfo *np = inet6_sk(sk); 410 struct sk_buff *skb; 411 struct ipv6_txoptions *opt; 412 413 /* Release rx options */ 414 415 skb = xchg(&np->pktoptions, NULL); 416 if (skb != NULL) 417 kfree_skb(skb); 418 419 skb = xchg(&np->rxpmtu, NULL); 420 if (skb != NULL) 421 kfree_skb(skb); 422 423 /* Free flowlabels */ 424 fl6_free_socklist(sk); 425 426 /* Free tx options */ 427 428 opt = xchg(&np->opt, NULL); 429 if (opt != NULL) 430 sock_kfree_s(sk, opt, opt->tot_len); 431 } 432 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 433 434 /* 435 * This does both peername and sockname. 436 */ 437 438 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 439 int *uaddr_len, int peer) 440 { 441 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 442 struct sock *sk = sock->sk; 443 struct inet_sock *inet = inet_sk(sk); 444 struct ipv6_pinfo *np = inet6_sk(sk); 445 446 sin->sin6_family = AF_INET6; 447 sin->sin6_flowinfo = 0; 448 sin->sin6_scope_id = 0; 449 if (peer) { 450 if (!inet->inet_dport) 451 return -ENOTCONN; 452 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 453 peer == 1) 454 return -ENOTCONN; 455 sin->sin6_port = inet->inet_dport; 456 sin->sin6_addr = sk->sk_v6_daddr; 457 if (np->sndflow) 458 sin->sin6_flowinfo = np->flow_label; 459 } else { 460 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 461 sin->sin6_addr = np->saddr; 462 else 463 sin->sin6_addr = sk->sk_v6_rcv_saddr; 464 465 sin->sin6_port = inet->inet_sport; 466 } 467 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 468 sk->sk_bound_dev_if); 469 *uaddr_len = sizeof(*sin); 470 return 0; 471 } 472 EXPORT_SYMBOL(inet6_getname); 473 474 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 475 { 476 struct sock *sk = sock->sk; 477 struct net *net = sock_net(sk); 478 479 switch (cmd) { 480 case SIOCGSTAMP: 481 return sock_get_timestamp(sk, (struct timeval __user *)arg); 482 483 case SIOCGSTAMPNS: 484 return sock_get_timestampns(sk, (struct timespec __user *)arg); 485 486 case SIOCADDRT: 487 case SIOCDELRT: 488 489 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 490 491 case SIOCSIFADDR: 492 return addrconf_add_ifaddr(net, (void __user *) arg); 493 case SIOCDIFADDR: 494 return addrconf_del_ifaddr(net, (void __user *) arg); 495 case SIOCSIFDSTADDR: 496 return addrconf_set_dstaddr(net, (void __user *) arg); 497 default: 498 if (!sk->sk_prot->ioctl) 499 return -ENOIOCTLCMD; 500 return sk->sk_prot->ioctl(sk, cmd, arg); 501 } 502 /*NOTREACHED*/ 503 return 0; 504 } 505 EXPORT_SYMBOL(inet6_ioctl); 506 507 const struct proto_ops inet6_stream_ops = { 508 .family = PF_INET6, 509 .owner = THIS_MODULE, 510 .release = inet6_release, 511 .bind = inet6_bind, 512 .connect = inet_stream_connect, /* ok */ 513 .socketpair = sock_no_socketpair, /* a do nothing */ 514 .accept = inet_accept, /* ok */ 515 .getname = inet6_getname, 516 .poll = tcp_poll, /* ok */ 517 .ioctl = inet6_ioctl, /* must change */ 518 .listen = inet_listen, /* ok */ 519 .shutdown = inet_shutdown, /* ok */ 520 .setsockopt = sock_common_setsockopt, /* ok */ 521 .getsockopt = sock_common_getsockopt, /* ok */ 522 .sendmsg = inet_sendmsg, /* ok */ 523 .recvmsg = inet_recvmsg, /* ok */ 524 .mmap = sock_no_mmap, 525 .sendpage = inet_sendpage, 526 .splice_read = tcp_splice_read, 527 #ifdef CONFIG_COMPAT 528 .compat_setsockopt = compat_sock_common_setsockopt, 529 .compat_getsockopt = compat_sock_common_getsockopt, 530 #endif 531 }; 532 533 const struct proto_ops inet6_dgram_ops = { 534 .family = PF_INET6, 535 .owner = THIS_MODULE, 536 .release = inet6_release, 537 .bind = inet6_bind, 538 .connect = inet_dgram_connect, /* ok */ 539 .socketpair = sock_no_socketpair, /* a do nothing */ 540 .accept = sock_no_accept, /* a do nothing */ 541 .getname = inet6_getname, 542 .poll = udp_poll, /* ok */ 543 .ioctl = inet6_ioctl, /* must change */ 544 .listen = sock_no_listen, /* ok */ 545 .shutdown = inet_shutdown, /* ok */ 546 .setsockopt = sock_common_setsockopt, /* ok */ 547 .getsockopt = sock_common_getsockopt, /* ok */ 548 .sendmsg = inet_sendmsg, /* ok */ 549 .recvmsg = inet_recvmsg, /* ok */ 550 .mmap = sock_no_mmap, 551 .sendpage = sock_no_sendpage, 552 #ifdef CONFIG_COMPAT 553 .compat_setsockopt = compat_sock_common_setsockopt, 554 .compat_getsockopt = compat_sock_common_getsockopt, 555 #endif 556 }; 557 558 static const struct net_proto_family inet6_family_ops = { 559 .family = PF_INET6, 560 .create = inet6_create, 561 .owner = THIS_MODULE, 562 }; 563 564 int inet6_register_protosw(struct inet_protosw *p) 565 { 566 struct list_head *lh; 567 struct inet_protosw *answer; 568 struct list_head *last_perm; 569 int protocol = p->protocol; 570 int ret; 571 572 spin_lock_bh(&inetsw6_lock); 573 574 ret = -EINVAL; 575 if (p->type >= SOCK_MAX) 576 goto out_illegal; 577 578 /* If we are trying to override a permanent protocol, bail. */ 579 answer = NULL; 580 ret = -EPERM; 581 last_perm = &inetsw6[p->type]; 582 list_for_each(lh, &inetsw6[p->type]) { 583 answer = list_entry(lh, struct inet_protosw, list); 584 585 /* Check only the non-wild match. */ 586 if (INET_PROTOSW_PERMANENT & answer->flags) { 587 if (protocol == answer->protocol) 588 break; 589 last_perm = lh; 590 } 591 592 answer = NULL; 593 } 594 if (answer) 595 goto out_permanent; 596 597 /* Add the new entry after the last permanent entry if any, so that 598 * the new entry does not override a permanent entry when matched with 599 * a wild-card protocol. But it is allowed to override any existing 600 * non-permanent entry. This means that when we remove this entry, the 601 * system automatically returns to the old behavior. 602 */ 603 list_add_rcu(&p->list, last_perm); 604 ret = 0; 605 out: 606 spin_unlock_bh(&inetsw6_lock); 607 return ret; 608 609 out_permanent: 610 pr_err("Attempt to override permanent protocol %d\n", protocol); 611 goto out; 612 613 out_illegal: 614 pr_err("Ignoring attempt to register invalid socket type %d\n", 615 p->type); 616 goto out; 617 } 618 EXPORT_SYMBOL(inet6_register_protosw); 619 620 void 621 inet6_unregister_protosw(struct inet_protosw *p) 622 { 623 if (INET_PROTOSW_PERMANENT & p->flags) { 624 pr_err("Attempt to unregister permanent protocol %d\n", 625 p->protocol); 626 } else { 627 spin_lock_bh(&inetsw6_lock); 628 list_del_rcu(&p->list); 629 spin_unlock_bh(&inetsw6_lock); 630 631 synchronize_net(); 632 } 633 } 634 EXPORT_SYMBOL(inet6_unregister_protosw); 635 636 int inet6_sk_rebuild_header(struct sock *sk) 637 { 638 struct ipv6_pinfo *np = inet6_sk(sk); 639 struct dst_entry *dst; 640 641 dst = __sk_dst_check(sk, np->dst_cookie); 642 643 if (dst == NULL) { 644 struct inet_sock *inet = inet_sk(sk); 645 struct in6_addr *final_p, final; 646 struct flowi6 fl6; 647 648 memset(&fl6, 0, sizeof(fl6)); 649 fl6.flowi6_proto = sk->sk_protocol; 650 fl6.daddr = sk->sk_v6_daddr; 651 fl6.saddr = np->saddr; 652 fl6.flowlabel = np->flow_label; 653 fl6.flowi6_oif = sk->sk_bound_dev_if; 654 fl6.flowi6_mark = sk->sk_mark; 655 fl6.fl6_dport = inet->inet_dport; 656 fl6.fl6_sport = inet->inet_sport; 657 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 658 659 final_p = fl6_update_dst(&fl6, np->opt, &final); 660 661 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 662 if (IS_ERR(dst)) { 663 sk->sk_route_caps = 0; 664 sk->sk_err_soft = -PTR_ERR(dst); 665 return PTR_ERR(dst); 666 } 667 668 __ip6_dst_store(sk, dst, NULL, NULL); 669 } 670 671 return 0; 672 } 673 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 674 675 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 676 const struct inet6_skb_parm *opt) 677 { 678 const struct ipv6_pinfo *np = inet6_sk(sk); 679 680 if (np->rxopt.all) { 681 if ((opt->hop && (np->rxopt.bits.hopopts || 682 np->rxopt.bits.ohopopts)) || 683 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 684 np->rxopt.bits.rxflow) || 685 (opt->srcrt && (np->rxopt.bits.srcrt || 686 np->rxopt.bits.osrcrt)) || 687 ((opt->dst1 || opt->dst0) && 688 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 689 return true; 690 } 691 return false; 692 } 693 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 694 695 static struct packet_type ipv6_packet_type __read_mostly = { 696 .type = cpu_to_be16(ETH_P_IPV6), 697 .func = ipv6_rcv, 698 }; 699 700 static int __init ipv6_packet_init(void) 701 { 702 dev_add_pack(&ipv6_packet_type); 703 return 0; 704 } 705 706 static void ipv6_packet_cleanup(void) 707 { 708 dev_remove_pack(&ipv6_packet_type); 709 } 710 711 static int __net_init ipv6_init_mibs(struct net *net) 712 { 713 int i; 714 715 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 716 if (!net->mib.udp_stats_in6) 717 return -ENOMEM; 718 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 719 if (!net->mib.udplite_stats_in6) 720 goto err_udplite_mib; 721 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 722 if (!net->mib.ipv6_statistics) 723 goto err_ip_mib; 724 725 for_each_possible_cpu(i) { 726 struct ipstats_mib *af_inet6_stats; 727 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 728 u64_stats_init(&af_inet6_stats->syncp); 729 } 730 731 732 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 733 if (!net->mib.icmpv6_statistics) 734 goto err_icmp_mib; 735 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 736 GFP_KERNEL); 737 if (!net->mib.icmpv6msg_statistics) 738 goto err_icmpmsg_mib; 739 return 0; 740 741 err_icmpmsg_mib: 742 free_percpu(net->mib.icmpv6_statistics); 743 err_icmp_mib: 744 free_percpu(net->mib.ipv6_statistics); 745 err_ip_mib: 746 free_percpu(net->mib.udplite_stats_in6); 747 err_udplite_mib: 748 free_percpu(net->mib.udp_stats_in6); 749 return -ENOMEM; 750 } 751 752 static void ipv6_cleanup_mibs(struct net *net) 753 { 754 free_percpu(net->mib.udp_stats_in6); 755 free_percpu(net->mib.udplite_stats_in6); 756 free_percpu(net->mib.ipv6_statistics); 757 free_percpu(net->mib.icmpv6_statistics); 758 kfree(net->mib.icmpv6msg_statistics); 759 } 760 761 static int __net_init inet6_net_init(struct net *net) 762 { 763 int err = 0; 764 765 net->ipv6.sysctl.bindv6only = 0; 766 net->ipv6.sysctl.icmpv6_time = 1*HZ; 767 net->ipv6.sysctl.flowlabel_consistency = 1; 768 net->ipv6.sysctl.auto_flowlabels = 0; 769 atomic_set(&net->ipv6.fib6_sernum, 1); 770 771 err = ipv6_init_mibs(net); 772 if (err) 773 return err; 774 #ifdef CONFIG_PROC_FS 775 err = udp6_proc_init(net); 776 if (err) 777 goto out; 778 err = tcp6_proc_init(net); 779 if (err) 780 goto proc_tcp6_fail; 781 err = ac6_proc_init(net); 782 if (err) 783 goto proc_ac6_fail; 784 #endif 785 return err; 786 787 #ifdef CONFIG_PROC_FS 788 proc_ac6_fail: 789 tcp6_proc_exit(net); 790 proc_tcp6_fail: 791 udp6_proc_exit(net); 792 out: 793 ipv6_cleanup_mibs(net); 794 return err; 795 #endif 796 } 797 798 static void __net_exit inet6_net_exit(struct net *net) 799 { 800 #ifdef CONFIG_PROC_FS 801 udp6_proc_exit(net); 802 tcp6_proc_exit(net); 803 ac6_proc_exit(net); 804 #endif 805 ipv6_cleanup_mibs(net); 806 } 807 808 static struct pernet_operations inet6_net_ops = { 809 .init = inet6_net_init, 810 .exit = inet6_net_exit, 811 }; 812 813 static const struct ipv6_stub ipv6_stub_impl = { 814 .ipv6_sock_mc_join = ipv6_sock_mc_join, 815 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 816 .ipv6_dst_lookup = ip6_dst_lookup, 817 .udpv6_encap_enable = udpv6_encap_enable, 818 .ndisc_send_na = ndisc_send_na, 819 .nd_tbl = &nd_tbl, 820 }; 821 822 static int __init inet6_init(void) 823 { 824 struct list_head *r; 825 int err = 0; 826 827 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > FIELD_SIZEOF(struct sk_buff, cb)); 828 829 /* Register the socket-side information for inet6_create. */ 830 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 831 INIT_LIST_HEAD(r); 832 833 if (disable_ipv6_mod) { 834 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 835 goto out; 836 } 837 838 err = proto_register(&tcpv6_prot, 1); 839 if (err) 840 goto out; 841 842 err = proto_register(&udpv6_prot, 1); 843 if (err) 844 goto out_unregister_tcp_proto; 845 846 err = proto_register(&udplitev6_prot, 1); 847 if (err) 848 goto out_unregister_udp_proto; 849 850 err = proto_register(&rawv6_prot, 1); 851 if (err) 852 goto out_unregister_udplite_proto; 853 854 err = proto_register(&pingv6_prot, 1); 855 if (err) 856 goto out_unregister_ping_proto; 857 858 /* We MUST register RAW sockets before we create the ICMP6, 859 * IGMP6, or NDISC control sockets. 860 */ 861 err = rawv6_init(); 862 if (err) 863 goto out_unregister_raw_proto; 864 865 /* Register the family here so that the init calls below will 866 * be able to create sockets. (?? is this dangerous ??) 867 */ 868 err = sock_register(&inet6_family_ops); 869 if (err) 870 goto out_sock_register_fail; 871 872 /* 873 * ipngwg API draft makes clear that the correct semantics 874 * for TCP and UDP is to consider one TCP and UDP instance 875 * in a host available by both INET and INET6 APIs and 876 * able to communicate via both network protocols. 877 */ 878 879 err = register_pernet_subsys(&inet6_net_ops); 880 if (err) 881 goto register_pernet_fail; 882 err = icmpv6_init(); 883 if (err) 884 goto icmp_fail; 885 err = ip6_mr_init(); 886 if (err) 887 goto ipmr_fail; 888 err = ndisc_init(); 889 if (err) 890 goto ndisc_fail; 891 err = igmp6_init(); 892 if (err) 893 goto igmp_fail; 894 895 ipv6_stub = &ipv6_stub_impl; 896 897 err = ipv6_netfilter_init(); 898 if (err) 899 goto netfilter_fail; 900 /* Create /proc/foo6 entries. */ 901 #ifdef CONFIG_PROC_FS 902 err = -ENOMEM; 903 if (raw6_proc_init()) 904 goto proc_raw6_fail; 905 if (udplite6_proc_init()) 906 goto proc_udplite6_fail; 907 if (ipv6_misc_proc_init()) 908 goto proc_misc6_fail; 909 if (if6_proc_init()) 910 goto proc_if6_fail; 911 #endif 912 err = ip6_route_init(); 913 if (err) 914 goto ip6_route_fail; 915 err = ndisc_late_init(); 916 if (err) 917 goto ndisc_late_fail; 918 err = ip6_flowlabel_init(); 919 if (err) 920 goto ip6_flowlabel_fail; 921 err = addrconf_init(); 922 if (err) 923 goto addrconf_fail; 924 925 /* Init v6 extension headers. */ 926 err = ipv6_exthdrs_init(); 927 if (err) 928 goto ipv6_exthdrs_fail; 929 930 err = ipv6_frag_init(); 931 if (err) 932 goto ipv6_frag_fail; 933 934 /* Init v6 transport protocols. */ 935 err = udpv6_init(); 936 if (err) 937 goto udpv6_fail; 938 939 err = udplitev6_init(); 940 if (err) 941 goto udplitev6_fail; 942 943 err = tcpv6_init(); 944 if (err) 945 goto tcpv6_fail; 946 947 err = ipv6_packet_init(); 948 if (err) 949 goto ipv6_packet_fail; 950 951 err = pingv6_init(); 952 if (err) 953 goto pingv6_fail; 954 955 #ifdef CONFIG_SYSCTL 956 err = ipv6_sysctl_register(); 957 if (err) 958 goto sysctl_fail; 959 #endif 960 out: 961 return err; 962 963 #ifdef CONFIG_SYSCTL 964 sysctl_fail: 965 pingv6_exit(); 966 #endif 967 pingv6_fail: 968 ipv6_packet_cleanup(); 969 ipv6_packet_fail: 970 tcpv6_exit(); 971 tcpv6_fail: 972 udplitev6_exit(); 973 udplitev6_fail: 974 udpv6_exit(); 975 udpv6_fail: 976 ipv6_frag_exit(); 977 ipv6_frag_fail: 978 ipv6_exthdrs_exit(); 979 ipv6_exthdrs_fail: 980 addrconf_cleanup(); 981 addrconf_fail: 982 ip6_flowlabel_cleanup(); 983 ip6_flowlabel_fail: 984 ndisc_late_cleanup(); 985 ndisc_late_fail: 986 ip6_route_cleanup(); 987 ip6_route_fail: 988 #ifdef CONFIG_PROC_FS 989 if6_proc_exit(); 990 proc_if6_fail: 991 ipv6_misc_proc_exit(); 992 proc_misc6_fail: 993 udplite6_proc_exit(); 994 proc_udplite6_fail: 995 raw6_proc_exit(); 996 proc_raw6_fail: 997 #endif 998 ipv6_netfilter_fini(); 999 netfilter_fail: 1000 igmp6_cleanup(); 1001 igmp_fail: 1002 ndisc_cleanup(); 1003 ndisc_fail: 1004 ip6_mr_cleanup(); 1005 ipmr_fail: 1006 icmpv6_cleanup(); 1007 icmp_fail: 1008 unregister_pernet_subsys(&inet6_net_ops); 1009 register_pernet_fail: 1010 sock_unregister(PF_INET6); 1011 rtnl_unregister_all(PF_INET6); 1012 out_sock_register_fail: 1013 rawv6_exit(); 1014 out_unregister_ping_proto: 1015 proto_unregister(&pingv6_prot); 1016 out_unregister_raw_proto: 1017 proto_unregister(&rawv6_prot); 1018 out_unregister_udplite_proto: 1019 proto_unregister(&udplitev6_prot); 1020 out_unregister_udp_proto: 1021 proto_unregister(&udpv6_prot); 1022 out_unregister_tcp_proto: 1023 proto_unregister(&tcpv6_prot); 1024 goto out; 1025 } 1026 module_init(inet6_init); 1027 1028 MODULE_ALIAS_NETPROTO(PF_INET6); 1029