1 /* 2 * PF_INET6 socket protocol family 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Adapted from linux/net/ipv4/af_inet.c 9 * 10 * Fixes: 11 * piggy, Karl Knutson : Socket protocol table 12 * Hideaki YOSHIFUJI : sin6_scope_id support 13 * Arnaldo Melo : check proc_net_create return, cleanups 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 */ 20 21 #define pr_fmt(fmt) "IPv6: " fmt 22 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/errno.h> 26 #include <linux/types.h> 27 #include <linux/socket.h> 28 #include <linux/in.h> 29 #include <linux/kernel.h> 30 #include <linux/timer.h> 31 #include <linux/string.h> 32 #include <linux/sockios.h> 33 #include <linux/net.h> 34 #include <linux/fcntl.h> 35 #include <linux/mm.h> 36 #include <linux/interrupt.h> 37 #include <linux/proc_fs.h> 38 #include <linux/stat.h> 39 #include <linux/init.h> 40 #include <linux/slab.h> 41 42 #include <linux/inet.h> 43 #include <linux/netdevice.h> 44 #include <linux/icmpv6.h> 45 #include <linux/netfilter_ipv6.h> 46 47 #include <net/ip.h> 48 #include <net/ipv6.h> 49 #include <net/udp.h> 50 #include <net/udplite.h> 51 #include <net/tcp.h> 52 #include <net/ping.h> 53 #include <net/protocol.h> 54 #include <net/inet_common.h> 55 #include <net/route.h> 56 #include <net/transp_v6.h> 57 #include <net/ip6_route.h> 58 #include <net/addrconf.h> 59 #include <net/ndisc.h> 60 #ifdef CONFIG_IPV6_TUNNEL 61 #include <net/ip6_tunnel.h> 62 #endif 63 #include <net/calipso.h> 64 #include <net/seg6.h> 65 66 #include <asm/uaccess.h> 67 #include <linux/mroute6.h> 68 69 #include "ip6_offload.h" 70 71 MODULE_AUTHOR("Cast of dozens"); 72 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 73 MODULE_LICENSE("GPL"); 74 75 /* The inetsw6 table contains everything that inet6_create needs to 76 * build a new socket. 77 */ 78 static struct list_head inetsw6[SOCK_MAX]; 79 static DEFINE_SPINLOCK(inetsw6_lock); 80 81 struct ipv6_params ipv6_defaults = { 82 .disable_ipv6 = 0, 83 .autoconf = 1, 84 }; 85 86 static int disable_ipv6_mod; 87 88 module_param_named(disable, disable_ipv6_mod, int, 0444); 89 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 90 91 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 92 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 93 94 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 95 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 96 97 bool ipv6_mod_enabled(void) 98 { 99 return disable_ipv6_mod == 0; 100 } 101 EXPORT_SYMBOL_GPL(ipv6_mod_enabled); 102 103 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 104 { 105 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 106 107 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 108 } 109 110 static int inet6_create(struct net *net, struct socket *sock, int protocol, 111 int kern) 112 { 113 struct inet_sock *inet; 114 struct ipv6_pinfo *np; 115 struct sock *sk; 116 struct inet_protosw *answer; 117 struct proto *answer_prot; 118 unsigned char answer_flags; 119 int try_loading_module = 0; 120 int err; 121 122 if (protocol < 0 || protocol >= IPPROTO_MAX) 123 return -EINVAL; 124 125 /* Look for the requested type/protocol pair. */ 126 lookup_protocol: 127 err = -ESOCKTNOSUPPORT; 128 rcu_read_lock(); 129 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 130 131 err = 0; 132 /* Check the non-wild match. */ 133 if (protocol == answer->protocol) { 134 if (protocol != IPPROTO_IP) 135 break; 136 } else { 137 /* Check for the two wild cases. */ 138 if (IPPROTO_IP == protocol) { 139 protocol = answer->protocol; 140 break; 141 } 142 if (IPPROTO_IP == answer->protocol) 143 break; 144 } 145 err = -EPROTONOSUPPORT; 146 } 147 148 if (err) { 149 if (try_loading_module < 2) { 150 rcu_read_unlock(); 151 /* 152 * Be more specific, e.g. net-pf-10-proto-132-type-1 153 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 154 */ 155 if (++try_loading_module == 1) 156 request_module("net-pf-%d-proto-%d-type-%d", 157 PF_INET6, protocol, sock->type); 158 /* 159 * Fall back to generic, e.g. net-pf-10-proto-132 160 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 161 */ 162 else 163 request_module("net-pf-%d-proto-%d", 164 PF_INET6, protocol); 165 goto lookup_protocol; 166 } else 167 goto out_rcu_unlock; 168 } 169 170 err = -EPERM; 171 if (sock->type == SOCK_RAW && !kern && 172 !ns_capable(net->user_ns, CAP_NET_RAW)) 173 goto out_rcu_unlock; 174 175 sock->ops = answer->ops; 176 answer_prot = answer->prot; 177 answer_flags = answer->flags; 178 rcu_read_unlock(); 179 180 WARN_ON(!answer_prot->slab); 181 182 err = -ENOBUFS; 183 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 184 if (!sk) 185 goto out; 186 187 sock_init_data(sock, sk); 188 189 err = 0; 190 if (INET_PROTOSW_REUSE & answer_flags) 191 sk->sk_reuse = SK_CAN_REUSE; 192 193 inet = inet_sk(sk); 194 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 195 196 if (SOCK_RAW == sock->type) { 197 inet->inet_num = protocol; 198 if (IPPROTO_RAW == protocol) 199 inet->hdrincl = 1; 200 } 201 202 sk->sk_destruct = inet_sock_destruct; 203 sk->sk_family = PF_INET6; 204 sk->sk_protocol = protocol; 205 206 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 207 208 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 209 np->hop_limit = -1; 210 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 211 np->mc_loop = 1; 212 np->pmtudisc = IPV6_PMTUDISC_WANT; 213 np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk)); 214 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 215 216 /* Init the ipv4 part of the socket since we can have sockets 217 * using v6 API for ipv4. 218 */ 219 inet->uc_ttl = -1; 220 221 inet->mc_loop = 1; 222 inet->mc_ttl = 1; 223 inet->mc_index = 0; 224 inet->mc_list = NULL; 225 inet->rcv_tos = 0; 226 227 if (net->ipv4.sysctl_ip_no_pmtu_disc) 228 inet->pmtudisc = IP_PMTUDISC_DONT; 229 else 230 inet->pmtudisc = IP_PMTUDISC_WANT; 231 /* 232 * Increment only the relevant sk_prot->socks debug field, this changes 233 * the previous behaviour of incrementing both the equivalent to 234 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 235 * 236 * This allows better debug granularity as we'll know exactly how many 237 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 238 * transport protocol socks. -acme 239 */ 240 sk_refcnt_debug_inc(sk); 241 242 if (inet->inet_num) { 243 /* It assumes that any protocol which allows 244 * the user to assign a number at socket 245 * creation time automatically shares. 246 */ 247 inet->inet_sport = htons(inet->inet_num); 248 err = sk->sk_prot->hash(sk); 249 if (err) { 250 sk_common_release(sk); 251 goto out; 252 } 253 } 254 if (sk->sk_prot->init) { 255 err = sk->sk_prot->init(sk); 256 if (err) { 257 sk_common_release(sk); 258 goto out; 259 } 260 } 261 out: 262 return err; 263 out_rcu_unlock: 264 rcu_read_unlock(); 265 goto out; 266 } 267 268 269 /* bind for INET6 API */ 270 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 271 { 272 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 273 struct sock *sk = sock->sk; 274 struct inet_sock *inet = inet_sk(sk); 275 struct ipv6_pinfo *np = inet6_sk(sk); 276 struct net *net = sock_net(sk); 277 __be32 v4addr = 0; 278 unsigned short snum; 279 int addr_type = 0; 280 int err = 0; 281 282 /* If the socket has its own bind function then use it. */ 283 if (sk->sk_prot->bind) 284 return sk->sk_prot->bind(sk, uaddr, addr_len); 285 286 if (addr_len < SIN6_LEN_RFC2133) 287 return -EINVAL; 288 289 if (addr->sin6_family != AF_INET6) 290 return -EAFNOSUPPORT; 291 292 addr_type = ipv6_addr_type(&addr->sin6_addr); 293 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 294 return -EINVAL; 295 296 snum = ntohs(addr->sin6_port); 297 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 298 return -EACCES; 299 300 lock_sock(sk); 301 302 /* Check these errors (active socket, double bind). */ 303 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 304 err = -EINVAL; 305 goto out; 306 } 307 308 /* Check if the address belongs to the host. */ 309 if (addr_type == IPV6_ADDR_MAPPED) { 310 int chk_addr_ret; 311 312 /* Binding to v4-mapped address on a v6-only socket 313 * makes no sense 314 */ 315 if (sk->sk_ipv6only) { 316 err = -EINVAL; 317 goto out; 318 } 319 320 /* Reproduce AF_INET checks to make the bindings consistent */ 321 v4addr = addr->sin6_addr.s6_addr32[3]; 322 chk_addr_ret = inet_addr_type(net, v4addr); 323 if (!net->ipv4.sysctl_ip_nonlocal_bind && 324 !(inet->freebind || inet->transparent) && 325 v4addr != htonl(INADDR_ANY) && 326 chk_addr_ret != RTN_LOCAL && 327 chk_addr_ret != RTN_MULTICAST && 328 chk_addr_ret != RTN_BROADCAST) { 329 err = -EADDRNOTAVAIL; 330 goto out; 331 } 332 } else { 333 if (addr_type != IPV6_ADDR_ANY) { 334 struct net_device *dev = NULL; 335 336 rcu_read_lock(); 337 if (__ipv6_addr_needs_scope_id(addr_type)) { 338 if (addr_len >= sizeof(struct sockaddr_in6) && 339 addr->sin6_scope_id) { 340 /* Override any existing binding, if another one 341 * is supplied by user. 342 */ 343 sk->sk_bound_dev_if = addr->sin6_scope_id; 344 } 345 346 /* Binding to link-local address requires an interface */ 347 if (!sk->sk_bound_dev_if) { 348 err = -EINVAL; 349 goto out_unlock; 350 } 351 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 352 if (!dev) { 353 err = -ENODEV; 354 goto out_unlock; 355 } 356 } 357 358 /* ipv4 addr of the socket is invalid. Only the 359 * unspecified and mapped address have a v4 equivalent. 360 */ 361 v4addr = LOOPBACK4_IPV6; 362 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 363 if (!net->ipv6.sysctl.ip_nonlocal_bind && 364 !(inet->freebind || inet->transparent) && 365 !ipv6_chk_addr(net, &addr->sin6_addr, 366 dev, 0)) { 367 err = -EADDRNOTAVAIL; 368 goto out_unlock; 369 } 370 } 371 rcu_read_unlock(); 372 } 373 } 374 375 inet->inet_rcv_saddr = v4addr; 376 inet->inet_saddr = v4addr; 377 378 sk->sk_v6_rcv_saddr = addr->sin6_addr; 379 380 if (!(addr_type & IPV6_ADDR_MULTICAST)) 381 np->saddr = addr->sin6_addr; 382 383 /* Make sure we are allowed to bind here. */ 384 if ((snum || !inet->bind_address_no_port) && 385 sk->sk_prot->get_port(sk, snum)) { 386 inet_reset_saddr(sk); 387 err = -EADDRINUSE; 388 goto out; 389 } 390 391 if (addr_type != IPV6_ADDR_ANY) { 392 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 393 if (addr_type != IPV6_ADDR_MAPPED) 394 sk->sk_ipv6only = 1; 395 } 396 if (snum) 397 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 398 inet->inet_sport = htons(inet->inet_num); 399 inet->inet_dport = 0; 400 inet->inet_daddr = 0; 401 out: 402 release_sock(sk); 403 return err; 404 out_unlock: 405 rcu_read_unlock(); 406 goto out; 407 } 408 EXPORT_SYMBOL(inet6_bind); 409 410 int inet6_release(struct socket *sock) 411 { 412 struct sock *sk = sock->sk; 413 414 if (!sk) 415 return -EINVAL; 416 417 /* Free mc lists */ 418 ipv6_sock_mc_close(sk); 419 420 /* Free ac lists */ 421 ipv6_sock_ac_close(sk); 422 423 return inet_release(sock); 424 } 425 EXPORT_SYMBOL(inet6_release); 426 427 void inet6_destroy_sock(struct sock *sk) 428 { 429 struct ipv6_pinfo *np = inet6_sk(sk); 430 struct sk_buff *skb; 431 struct ipv6_txoptions *opt; 432 433 /* Release rx options */ 434 435 skb = xchg(&np->pktoptions, NULL); 436 if (skb) 437 kfree_skb(skb); 438 439 skb = xchg(&np->rxpmtu, NULL); 440 if (skb) 441 kfree_skb(skb); 442 443 /* Free flowlabels */ 444 fl6_free_socklist(sk); 445 446 /* Free tx options */ 447 448 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 449 if (opt) { 450 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 451 txopt_put(opt); 452 } 453 } 454 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 455 456 /* 457 * This does both peername and sockname. 458 */ 459 460 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 461 int *uaddr_len, int peer) 462 { 463 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 464 struct sock *sk = sock->sk; 465 struct inet_sock *inet = inet_sk(sk); 466 struct ipv6_pinfo *np = inet6_sk(sk); 467 468 sin->sin6_family = AF_INET6; 469 sin->sin6_flowinfo = 0; 470 sin->sin6_scope_id = 0; 471 if (peer) { 472 if (!inet->inet_dport) 473 return -ENOTCONN; 474 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 475 peer == 1) 476 return -ENOTCONN; 477 sin->sin6_port = inet->inet_dport; 478 sin->sin6_addr = sk->sk_v6_daddr; 479 if (np->sndflow) 480 sin->sin6_flowinfo = np->flow_label; 481 } else { 482 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 483 sin->sin6_addr = np->saddr; 484 else 485 sin->sin6_addr = sk->sk_v6_rcv_saddr; 486 487 sin->sin6_port = inet->inet_sport; 488 } 489 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 490 sk->sk_bound_dev_if); 491 *uaddr_len = sizeof(*sin); 492 return 0; 493 } 494 EXPORT_SYMBOL(inet6_getname); 495 496 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 497 { 498 struct sock *sk = sock->sk; 499 struct net *net = sock_net(sk); 500 501 switch (cmd) { 502 case SIOCGSTAMP: 503 return sock_get_timestamp(sk, (struct timeval __user *)arg); 504 505 case SIOCGSTAMPNS: 506 return sock_get_timestampns(sk, (struct timespec __user *)arg); 507 508 case SIOCADDRT: 509 case SIOCDELRT: 510 511 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 512 513 case SIOCSIFADDR: 514 return addrconf_add_ifaddr(net, (void __user *) arg); 515 case SIOCDIFADDR: 516 return addrconf_del_ifaddr(net, (void __user *) arg); 517 case SIOCSIFDSTADDR: 518 return addrconf_set_dstaddr(net, (void __user *) arg); 519 default: 520 if (!sk->sk_prot->ioctl) 521 return -ENOIOCTLCMD; 522 return sk->sk_prot->ioctl(sk, cmd, arg); 523 } 524 /*NOTREACHED*/ 525 return 0; 526 } 527 EXPORT_SYMBOL(inet6_ioctl); 528 529 const struct proto_ops inet6_stream_ops = { 530 .family = PF_INET6, 531 .owner = THIS_MODULE, 532 .release = inet6_release, 533 .bind = inet6_bind, 534 .connect = inet_stream_connect, /* ok */ 535 .socketpair = sock_no_socketpair, /* a do nothing */ 536 .accept = inet_accept, /* ok */ 537 .getname = inet6_getname, 538 .poll = tcp_poll, /* ok */ 539 .ioctl = inet6_ioctl, /* must change */ 540 .listen = inet_listen, /* ok */ 541 .shutdown = inet_shutdown, /* ok */ 542 .setsockopt = sock_common_setsockopt, /* ok */ 543 .getsockopt = sock_common_getsockopt, /* ok */ 544 .sendmsg = inet_sendmsg, /* ok */ 545 .recvmsg = inet_recvmsg, /* ok */ 546 .mmap = sock_no_mmap, 547 .sendpage = inet_sendpage, 548 .splice_read = tcp_splice_read, 549 .read_sock = tcp_read_sock, 550 .peek_len = tcp_peek_len, 551 #ifdef CONFIG_COMPAT 552 .compat_setsockopt = compat_sock_common_setsockopt, 553 .compat_getsockopt = compat_sock_common_getsockopt, 554 #endif 555 }; 556 557 const struct proto_ops inet6_dgram_ops = { 558 .family = PF_INET6, 559 .owner = THIS_MODULE, 560 .release = inet6_release, 561 .bind = inet6_bind, 562 .connect = inet_dgram_connect, /* ok */ 563 .socketpair = sock_no_socketpair, /* a do nothing */ 564 .accept = sock_no_accept, /* a do nothing */ 565 .getname = inet6_getname, 566 .poll = udp_poll, /* ok */ 567 .ioctl = inet6_ioctl, /* must change */ 568 .listen = sock_no_listen, /* ok */ 569 .shutdown = inet_shutdown, /* ok */ 570 .setsockopt = sock_common_setsockopt, /* ok */ 571 .getsockopt = sock_common_getsockopt, /* ok */ 572 .sendmsg = inet_sendmsg, /* ok */ 573 .recvmsg = inet_recvmsg, /* ok */ 574 .mmap = sock_no_mmap, 575 .sendpage = sock_no_sendpage, 576 .set_peek_off = sk_set_peek_off, 577 #ifdef CONFIG_COMPAT 578 .compat_setsockopt = compat_sock_common_setsockopt, 579 .compat_getsockopt = compat_sock_common_getsockopt, 580 #endif 581 }; 582 583 static const struct net_proto_family inet6_family_ops = { 584 .family = PF_INET6, 585 .create = inet6_create, 586 .owner = THIS_MODULE, 587 }; 588 589 int inet6_register_protosw(struct inet_protosw *p) 590 { 591 struct list_head *lh; 592 struct inet_protosw *answer; 593 struct list_head *last_perm; 594 int protocol = p->protocol; 595 int ret; 596 597 spin_lock_bh(&inetsw6_lock); 598 599 ret = -EINVAL; 600 if (p->type >= SOCK_MAX) 601 goto out_illegal; 602 603 /* If we are trying to override a permanent protocol, bail. */ 604 answer = NULL; 605 ret = -EPERM; 606 last_perm = &inetsw6[p->type]; 607 list_for_each(lh, &inetsw6[p->type]) { 608 answer = list_entry(lh, struct inet_protosw, list); 609 610 /* Check only the non-wild match. */ 611 if (INET_PROTOSW_PERMANENT & answer->flags) { 612 if (protocol == answer->protocol) 613 break; 614 last_perm = lh; 615 } 616 617 answer = NULL; 618 } 619 if (answer) 620 goto out_permanent; 621 622 /* Add the new entry after the last permanent entry if any, so that 623 * the new entry does not override a permanent entry when matched with 624 * a wild-card protocol. But it is allowed to override any existing 625 * non-permanent entry. This means that when we remove this entry, the 626 * system automatically returns to the old behavior. 627 */ 628 list_add_rcu(&p->list, last_perm); 629 ret = 0; 630 out: 631 spin_unlock_bh(&inetsw6_lock); 632 return ret; 633 634 out_permanent: 635 pr_err("Attempt to override permanent protocol %d\n", protocol); 636 goto out; 637 638 out_illegal: 639 pr_err("Ignoring attempt to register invalid socket type %d\n", 640 p->type); 641 goto out; 642 } 643 EXPORT_SYMBOL(inet6_register_protosw); 644 645 void 646 inet6_unregister_protosw(struct inet_protosw *p) 647 { 648 if (INET_PROTOSW_PERMANENT & p->flags) { 649 pr_err("Attempt to unregister permanent protocol %d\n", 650 p->protocol); 651 } else { 652 spin_lock_bh(&inetsw6_lock); 653 list_del_rcu(&p->list); 654 spin_unlock_bh(&inetsw6_lock); 655 656 synchronize_net(); 657 } 658 } 659 EXPORT_SYMBOL(inet6_unregister_protosw); 660 661 int inet6_sk_rebuild_header(struct sock *sk) 662 { 663 struct ipv6_pinfo *np = inet6_sk(sk); 664 struct dst_entry *dst; 665 666 dst = __sk_dst_check(sk, np->dst_cookie); 667 668 if (!dst) { 669 struct inet_sock *inet = inet_sk(sk); 670 struct in6_addr *final_p, final; 671 struct flowi6 fl6; 672 673 memset(&fl6, 0, sizeof(fl6)); 674 fl6.flowi6_proto = sk->sk_protocol; 675 fl6.daddr = sk->sk_v6_daddr; 676 fl6.saddr = np->saddr; 677 fl6.flowlabel = np->flow_label; 678 fl6.flowi6_oif = sk->sk_bound_dev_if; 679 fl6.flowi6_mark = sk->sk_mark; 680 fl6.fl6_dport = inet->inet_dport; 681 fl6.fl6_sport = inet->inet_sport; 682 fl6.flowi6_uid = sk->sk_uid; 683 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 684 685 rcu_read_lock(); 686 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 687 &final); 688 rcu_read_unlock(); 689 690 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 691 if (IS_ERR(dst)) { 692 sk->sk_route_caps = 0; 693 sk->sk_err_soft = -PTR_ERR(dst); 694 return PTR_ERR(dst); 695 } 696 697 ip6_dst_store(sk, dst, NULL, NULL); 698 } 699 700 return 0; 701 } 702 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 703 704 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 705 const struct inet6_skb_parm *opt) 706 { 707 const struct ipv6_pinfo *np = inet6_sk(sk); 708 709 if (np->rxopt.all) { 710 if (((opt->flags & IP6SKB_HOPBYHOP) && 711 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 712 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 713 np->rxopt.bits.rxflow) || 714 (opt->srcrt && (np->rxopt.bits.srcrt || 715 np->rxopt.bits.osrcrt)) || 716 ((opt->dst1 || opt->dst0) && 717 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 718 return true; 719 } 720 return false; 721 } 722 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 723 724 static struct packet_type ipv6_packet_type __read_mostly = { 725 .type = cpu_to_be16(ETH_P_IPV6), 726 .func = ipv6_rcv, 727 }; 728 729 static int __init ipv6_packet_init(void) 730 { 731 dev_add_pack(&ipv6_packet_type); 732 return 0; 733 } 734 735 static void ipv6_packet_cleanup(void) 736 { 737 dev_remove_pack(&ipv6_packet_type); 738 } 739 740 static int __net_init ipv6_init_mibs(struct net *net) 741 { 742 int i; 743 744 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 745 if (!net->mib.udp_stats_in6) 746 return -ENOMEM; 747 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 748 if (!net->mib.udplite_stats_in6) 749 goto err_udplite_mib; 750 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 751 if (!net->mib.ipv6_statistics) 752 goto err_ip_mib; 753 754 for_each_possible_cpu(i) { 755 struct ipstats_mib *af_inet6_stats; 756 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 757 u64_stats_init(&af_inet6_stats->syncp); 758 } 759 760 761 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 762 if (!net->mib.icmpv6_statistics) 763 goto err_icmp_mib; 764 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 765 GFP_KERNEL); 766 if (!net->mib.icmpv6msg_statistics) 767 goto err_icmpmsg_mib; 768 return 0; 769 770 err_icmpmsg_mib: 771 free_percpu(net->mib.icmpv6_statistics); 772 err_icmp_mib: 773 free_percpu(net->mib.ipv6_statistics); 774 err_ip_mib: 775 free_percpu(net->mib.udplite_stats_in6); 776 err_udplite_mib: 777 free_percpu(net->mib.udp_stats_in6); 778 return -ENOMEM; 779 } 780 781 static void ipv6_cleanup_mibs(struct net *net) 782 { 783 free_percpu(net->mib.udp_stats_in6); 784 free_percpu(net->mib.udplite_stats_in6); 785 free_percpu(net->mib.ipv6_statistics); 786 free_percpu(net->mib.icmpv6_statistics); 787 kfree(net->mib.icmpv6msg_statistics); 788 } 789 790 static int __net_init inet6_net_init(struct net *net) 791 { 792 int err = 0; 793 794 net->ipv6.sysctl.bindv6only = 0; 795 net->ipv6.sysctl.icmpv6_time = 1*HZ; 796 net->ipv6.sysctl.flowlabel_consistency = 1; 797 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 798 net->ipv6.sysctl.idgen_retries = 3; 799 net->ipv6.sysctl.idgen_delay = 1 * HZ; 800 net->ipv6.sysctl.flowlabel_state_ranges = 0; 801 atomic_set(&net->ipv6.fib6_sernum, 1); 802 803 err = ipv6_init_mibs(net); 804 if (err) 805 return err; 806 #ifdef CONFIG_PROC_FS 807 err = udp6_proc_init(net); 808 if (err) 809 goto out; 810 err = tcp6_proc_init(net); 811 if (err) 812 goto proc_tcp6_fail; 813 err = ac6_proc_init(net); 814 if (err) 815 goto proc_ac6_fail; 816 #endif 817 return err; 818 819 #ifdef CONFIG_PROC_FS 820 proc_ac6_fail: 821 tcp6_proc_exit(net); 822 proc_tcp6_fail: 823 udp6_proc_exit(net); 824 out: 825 ipv6_cleanup_mibs(net); 826 return err; 827 #endif 828 } 829 830 static void __net_exit inet6_net_exit(struct net *net) 831 { 832 #ifdef CONFIG_PROC_FS 833 udp6_proc_exit(net); 834 tcp6_proc_exit(net); 835 ac6_proc_exit(net); 836 #endif 837 ipv6_cleanup_mibs(net); 838 } 839 840 static struct pernet_operations inet6_net_ops = { 841 .init = inet6_net_init, 842 .exit = inet6_net_exit, 843 }; 844 845 static const struct ipv6_stub ipv6_stub_impl = { 846 .ipv6_sock_mc_join = ipv6_sock_mc_join, 847 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 848 .ipv6_dst_lookup = ip6_dst_lookup, 849 .udpv6_encap_enable = udpv6_encap_enable, 850 .ndisc_send_na = ndisc_send_na, 851 .nd_tbl = &nd_tbl, 852 }; 853 854 static int __init inet6_init(void) 855 { 856 struct list_head *r; 857 int err = 0; 858 859 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 860 861 /* Register the socket-side information for inet6_create. */ 862 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 863 INIT_LIST_HEAD(r); 864 865 if (disable_ipv6_mod) { 866 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 867 goto out; 868 } 869 870 err = proto_register(&tcpv6_prot, 1); 871 if (err) 872 goto out; 873 874 err = proto_register(&udpv6_prot, 1); 875 if (err) 876 goto out_unregister_tcp_proto; 877 878 err = proto_register(&udplitev6_prot, 1); 879 if (err) 880 goto out_unregister_udp_proto; 881 882 err = proto_register(&rawv6_prot, 1); 883 if (err) 884 goto out_unregister_udplite_proto; 885 886 err = proto_register(&pingv6_prot, 1); 887 if (err) 888 goto out_unregister_ping_proto; 889 890 /* We MUST register RAW sockets before we create the ICMP6, 891 * IGMP6, or NDISC control sockets. 892 */ 893 err = rawv6_init(); 894 if (err) 895 goto out_unregister_raw_proto; 896 897 /* Register the family here so that the init calls below will 898 * be able to create sockets. (?? is this dangerous ??) 899 */ 900 err = sock_register(&inet6_family_ops); 901 if (err) 902 goto out_sock_register_fail; 903 904 /* 905 * ipngwg API draft makes clear that the correct semantics 906 * for TCP and UDP is to consider one TCP and UDP instance 907 * in a host available by both INET and INET6 APIs and 908 * able to communicate via both network protocols. 909 */ 910 911 err = register_pernet_subsys(&inet6_net_ops); 912 if (err) 913 goto register_pernet_fail; 914 err = icmpv6_init(); 915 if (err) 916 goto icmp_fail; 917 err = ip6_mr_init(); 918 if (err) 919 goto ipmr_fail; 920 err = ndisc_init(); 921 if (err) 922 goto ndisc_fail; 923 err = igmp6_init(); 924 if (err) 925 goto igmp_fail; 926 927 ipv6_stub = &ipv6_stub_impl; 928 929 err = ipv6_netfilter_init(); 930 if (err) 931 goto netfilter_fail; 932 /* Create /proc/foo6 entries. */ 933 #ifdef CONFIG_PROC_FS 934 err = -ENOMEM; 935 if (raw6_proc_init()) 936 goto proc_raw6_fail; 937 if (udplite6_proc_init()) 938 goto proc_udplite6_fail; 939 if (ipv6_misc_proc_init()) 940 goto proc_misc6_fail; 941 if (if6_proc_init()) 942 goto proc_if6_fail; 943 #endif 944 err = ip6_route_init(); 945 if (err) 946 goto ip6_route_fail; 947 err = ndisc_late_init(); 948 if (err) 949 goto ndisc_late_fail; 950 err = ip6_flowlabel_init(); 951 if (err) 952 goto ip6_flowlabel_fail; 953 err = addrconf_init(); 954 if (err) 955 goto addrconf_fail; 956 957 /* Init v6 extension headers. */ 958 err = ipv6_exthdrs_init(); 959 if (err) 960 goto ipv6_exthdrs_fail; 961 962 err = ipv6_frag_init(); 963 if (err) 964 goto ipv6_frag_fail; 965 966 /* Init v6 transport protocols. */ 967 err = udpv6_init(); 968 if (err) 969 goto udpv6_fail; 970 971 err = udplitev6_init(); 972 if (err) 973 goto udplitev6_fail; 974 975 err = udpv6_offload_init(); 976 if (err) 977 goto udpv6_offload_fail; 978 979 err = tcpv6_init(); 980 if (err) 981 goto tcpv6_fail; 982 983 err = ipv6_packet_init(); 984 if (err) 985 goto ipv6_packet_fail; 986 987 err = pingv6_init(); 988 if (err) 989 goto pingv6_fail; 990 991 err = calipso_init(); 992 if (err) 993 goto calipso_fail; 994 995 err = seg6_init(); 996 if (err) 997 goto seg6_fail; 998 999 #ifdef CONFIG_SYSCTL 1000 err = ipv6_sysctl_register(); 1001 if (err) 1002 goto sysctl_fail; 1003 #endif 1004 out: 1005 return err; 1006 1007 #ifdef CONFIG_SYSCTL 1008 sysctl_fail: 1009 seg6_exit(); 1010 #endif 1011 seg6_fail: 1012 calipso_exit(); 1013 calipso_fail: 1014 pingv6_exit(); 1015 pingv6_fail: 1016 ipv6_packet_cleanup(); 1017 ipv6_packet_fail: 1018 tcpv6_exit(); 1019 tcpv6_fail: 1020 udpv6_offload_exit(); 1021 udpv6_offload_fail: 1022 udplitev6_exit(); 1023 udplitev6_fail: 1024 udpv6_exit(); 1025 udpv6_fail: 1026 ipv6_frag_exit(); 1027 ipv6_frag_fail: 1028 ipv6_exthdrs_exit(); 1029 ipv6_exthdrs_fail: 1030 addrconf_cleanup(); 1031 addrconf_fail: 1032 ip6_flowlabel_cleanup(); 1033 ip6_flowlabel_fail: 1034 ndisc_late_cleanup(); 1035 ndisc_late_fail: 1036 ip6_route_cleanup(); 1037 ip6_route_fail: 1038 #ifdef CONFIG_PROC_FS 1039 if6_proc_exit(); 1040 proc_if6_fail: 1041 ipv6_misc_proc_exit(); 1042 proc_misc6_fail: 1043 udplite6_proc_exit(); 1044 proc_udplite6_fail: 1045 raw6_proc_exit(); 1046 proc_raw6_fail: 1047 #endif 1048 ipv6_netfilter_fini(); 1049 netfilter_fail: 1050 igmp6_cleanup(); 1051 igmp_fail: 1052 ndisc_cleanup(); 1053 ndisc_fail: 1054 ip6_mr_cleanup(); 1055 ipmr_fail: 1056 icmpv6_cleanup(); 1057 icmp_fail: 1058 unregister_pernet_subsys(&inet6_net_ops); 1059 register_pernet_fail: 1060 sock_unregister(PF_INET6); 1061 rtnl_unregister_all(PF_INET6); 1062 out_sock_register_fail: 1063 rawv6_exit(); 1064 out_unregister_ping_proto: 1065 proto_unregister(&pingv6_prot); 1066 out_unregister_raw_proto: 1067 proto_unregister(&rawv6_prot); 1068 out_unregister_udplite_proto: 1069 proto_unregister(&udplitev6_prot); 1070 out_unregister_udp_proto: 1071 proto_unregister(&udpv6_prot); 1072 out_unregister_tcp_proto: 1073 proto_unregister(&tcpv6_prot); 1074 goto out; 1075 } 1076 module_init(inet6_init); 1077 1078 MODULE_ALIAS_NETPROTO(PF_INET6); 1079