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 <linux/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->mc_all = 1; 213 np->pmtudisc = IPV6_PMTUDISC_WANT; 214 np->repflow = net->ipv6.sysctl.flowlabel_reflect; 215 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 216 217 /* Init the ipv4 part of the socket since we can have sockets 218 * using v6 API for ipv4. 219 */ 220 inet->uc_ttl = -1; 221 222 inet->mc_loop = 1; 223 inet->mc_ttl = 1; 224 inet->mc_index = 0; 225 inet->mc_list = NULL; 226 inet->rcv_tos = 0; 227 228 if (net->ipv4.sysctl_ip_no_pmtu_disc) 229 inet->pmtudisc = IP_PMTUDISC_DONT; 230 else 231 inet->pmtudisc = IP_PMTUDISC_WANT; 232 /* 233 * Increment only the relevant sk_prot->socks debug field, this changes 234 * the previous behaviour of incrementing both the equivalent to 235 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 236 * 237 * This allows better debug granularity as we'll know exactly how many 238 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 239 * transport protocol socks. -acme 240 */ 241 sk_refcnt_debug_inc(sk); 242 243 if (inet->inet_num) { 244 /* It assumes that any protocol which allows 245 * the user to assign a number at socket 246 * creation time automatically shares. 247 */ 248 inet->inet_sport = htons(inet->inet_num); 249 err = sk->sk_prot->hash(sk); 250 if (err) { 251 sk_common_release(sk); 252 goto out; 253 } 254 } 255 if (sk->sk_prot->init) { 256 err = sk->sk_prot->init(sk); 257 if (err) { 258 sk_common_release(sk); 259 goto out; 260 } 261 } 262 263 if (!kern) { 264 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 265 if (err) { 266 sk_common_release(sk); 267 goto out; 268 } 269 } 270 out: 271 return err; 272 out_rcu_unlock: 273 rcu_read_unlock(); 274 goto out; 275 } 276 277 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 278 bool force_bind_address_no_port, bool with_lock) 279 { 280 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 281 struct inet_sock *inet = inet_sk(sk); 282 struct ipv6_pinfo *np = inet6_sk(sk); 283 struct net *net = sock_net(sk); 284 __be32 v4addr = 0; 285 unsigned short snum; 286 bool saved_ipv6only; 287 int addr_type = 0; 288 int err = 0; 289 290 if (addr->sin6_family != AF_INET6) 291 return -EAFNOSUPPORT; 292 293 addr_type = ipv6_addr_type(&addr->sin6_addr); 294 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM) 295 return -EINVAL; 296 297 snum = ntohs(addr->sin6_port); 298 if (snum && snum < inet_prot_sock(net) && 299 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 300 return -EACCES; 301 302 if (with_lock) 303 lock_sock(sk); 304 305 /* Check these errors (active socket, double bind). */ 306 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 307 err = -EINVAL; 308 goto out; 309 } 310 311 /* Check if the address belongs to the host. */ 312 if (addr_type == IPV6_ADDR_MAPPED) { 313 int chk_addr_ret; 314 315 /* Binding to v4-mapped address on a v6-only socket 316 * makes no sense 317 */ 318 if (sk->sk_ipv6only) { 319 err = -EINVAL; 320 goto out; 321 } 322 323 /* Reproduce AF_INET checks to make the bindings consistent */ 324 v4addr = addr->sin6_addr.s6_addr32[3]; 325 chk_addr_ret = inet_addr_type(net, v4addr); 326 if (!inet_can_nonlocal_bind(net, inet) && 327 v4addr != htonl(INADDR_ANY) && 328 chk_addr_ret != RTN_LOCAL && 329 chk_addr_ret != RTN_MULTICAST && 330 chk_addr_ret != RTN_BROADCAST) { 331 err = -EADDRNOTAVAIL; 332 goto out; 333 } 334 } else { 335 if (addr_type != IPV6_ADDR_ANY) { 336 struct net_device *dev = NULL; 337 338 rcu_read_lock(); 339 if (__ipv6_addr_needs_scope_id(addr_type)) { 340 if (addr_len >= sizeof(struct sockaddr_in6) && 341 addr->sin6_scope_id) { 342 /* Override any existing binding, if another one 343 * is supplied by user. 344 */ 345 sk->sk_bound_dev_if = addr->sin6_scope_id; 346 } 347 348 /* Binding to link-local address requires an interface */ 349 if (!sk->sk_bound_dev_if) { 350 err = -EINVAL; 351 goto out_unlock; 352 } 353 } 354 355 if (sk->sk_bound_dev_if) { 356 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 357 if (!dev) { 358 err = -ENODEV; 359 goto out_unlock; 360 } 361 } 362 363 /* ipv4 addr of the socket is invalid. Only the 364 * unspecified and mapped address have a v4 equivalent. 365 */ 366 v4addr = LOOPBACK4_IPV6; 367 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 368 if (!ipv6_can_nonlocal_bind(net, inet) && 369 !ipv6_chk_addr(net, &addr->sin6_addr, 370 dev, 0)) { 371 err = -EADDRNOTAVAIL; 372 goto out_unlock; 373 } 374 } 375 rcu_read_unlock(); 376 } 377 } 378 379 inet->inet_rcv_saddr = v4addr; 380 inet->inet_saddr = v4addr; 381 382 sk->sk_v6_rcv_saddr = addr->sin6_addr; 383 384 if (!(addr_type & IPV6_ADDR_MULTICAST)) 385 np->saddr = addr->sin6_addr; 386 387 saved_ipv6only = sk->sk_ipv6only; 388 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED) 389 sk->sk_ipv6only = 1; 390 391 /* Make sure we are allowed to bind here. */ 392 if (snum || !(inet->bind_address_no_port || 393 force_bind_address_no_port)) { 394 if (sk->sk_prot->get_port(sk, snum)) { 395 sk->sk_ipv6only = saved_ipv6only; 396 inet_reset_saddr(sk); 397 err = -EADDRINUSE; 398 goto out; 399 } 400 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk); 401 if (err) { 402 sk->sk_ipv6only = saved_ipv6only; 403 inet_reset_saddr(sk); 404 goto out; 405 } 406 } 407 408 if (addr_type != IPV6_ADDR_ANY) 409 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 410 if (snum) 411 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 412 inet->inet_sport = htons(inet->inet_num); 413 inet->inet_dport = 0; 414 inet->inet_daddr = 0; 415 out: 416 if (with_lock) 417 release_sock(sk); 418 return err; 419 out_unlock: 420 rcu_read_unlock(); 421 goto out; 422 } 423 424 /* bind for INET6 API */ 425 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 426 { 427 struct sock *sk = sock->sk; 428 int err = 0; 429 430 /* If the socket has its own bind function then use it. */ 431 if (sk->sk_prot->bind) 432 return sk->sk_prot->bind(sk, uaddr, addr_len); 433 434 if (addr_len < SIN6_LEN_RFC2133) 435 return -EINVAL; 436 437 /* BPF prog is run before any checks are done so that if the prog 438 * changes context in a wrong way it will be caught. 439 */ 440 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr); 441 if (err) 442 return err; 443 444 return __inet6_bind(sk, uaddr, addr_len, false, true); 445 } 446 EXPORT_SYMBOL(inet6_bind); 447 448 int inet6_release(struct socket *sock) 449 { 450 struct sock *sk = sock->sk; 451 452 if (!sk) 453 return -EINVAL; 454 455 /* Free mc lists */ 456 ipv6_sock_mc_close(sk); 457 458 /* Free ac lists */ 459 ipv6_sock_ac_close(sk); 460 461 return inet_release(sock); 462 } 463 EXPORT_SYMBOL(inet6_release); 464 465 void inet6_destroy_sock(struct sock *sk) 466 { 467 struct ipv6_pinfo *np = inet6_sk(sk); 468 struct sk_buff *skb; 469 struct ipv6_txoptions *opt; 470 471 /* Release rx options */ 472 473 skb = xchg(&np->pktoptions, NULL); 474 kfree_skb(skb); 475 476 skb = xchg(&np->rxpmtu, NULL); 477 kfree_skb(skb); 478 479 /* Free flowlabels */ 480 fl6_free_socklist(sk); 481 482 /* Free tx options */ 483 484 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 485 if (opt) { 486 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 487 txopt_put(opt); 488 } 489 } 490 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 491 492 /* 493 * This does both peername and sockname. 494 */ 495 496 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 497 int peer) 498 { 499 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 500 struct sock *sk = sock->sk; 501 struct inet_sock *inet = inet_sk(sk); 502 struct ipv6_pinfo *np = inet6_sk(sk); 503 504 sin->sin6_family = AF_INET6; 505 sin->sin6_flowinfo = 0; 506 sin->sin6_scope_id = 0; 507 if (peer) { 508 if (!inet->inet_dport) 509 return -ENOTCONN; 510 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 511 peer == 1) 512 return -ENOTCONN; 513 sin->sin6_port = inet->inet_dport; 514 sin->sin6_addr = sk->sk_v6_daddr; 515 if (np->sndflow) 516 sin->sin6_flowinfo = np->flow_label; 517 } else { 518 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 519 sin->sin6_addr = np->saddr; 520 else 521 sin->sin6_addr = sk->sk_v6_rcv_saddr; 522 523 sin->sin6_port = inet->inet_sport; 524 } 525 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 526 sk->sk_bound_dev_if); 527 return sizeof(*sin); 528 } 529 EXPORT_SYMBOL(inet6_getname); 530 531 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 532 { 533 struct sock *sk = sock->sk; 534 struct net *net = sock_net(sk); 535 536 switch (cmd) { 537 case SIOCGSTAMP: 538 return sock_get_timestamp(sk, (struct timeval __user *)arg); 539 540 case SIOCGSTAMPNS: 541 return sock_get_timestampns(sk, (struct timespec __user *)arg); 542 543 case SIOCADDRT: 544 case SIOCDELRT: 545 546 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 547 548 case SIOCSIFADDR: 549 return addrconf_add_ifaddr(net, (void __user *) arg); 550 case SIOCDIFADDR: 551 return addrconf_del_ifaddr(net, (void __user *) arg); 552 case SIOCSIFDSTADDR: 553 return addrconf_set_dstaddr(net, (void __user *) arg); 554 default: 555 if (!sk->sk_prot->ioctl) 556 return -ENOIOCTLCMD; 557 return sk->sk_prot->ioctl(sk, cmd, arg); 558 } 559 /*NOTREACHED*/ 560 return 0; 561 } 562 EXPORT_SYMBOL(inet6_ioctl); 563 564 const struct proto_ops inet6_stream_ops = { 565 .family = PF_INET6, 566 .owner = THIS_MODULE, 567 .release = inet6_release, 568 .bind = inet6_bind, 569 .connect = inet_stream_connect, /* ok */ 570 .socketpair = sock_no_socketpair, /* a do nothing */ 571 .accept = inet_accept, /* ok */ 572 .getname = inet6_getname, 573 .poll = tcp_poll, /* ok */ 574 .ioctl = inet6_ioctl, /* must change */ 575 .listen = inet_listen, /* ok */ 576 .shutdown = inet_shutdown, /* ok */ 577 .setsockopt = sock_common_setsockopt, /* ok */ 578 .getsockopt = sock_common_getsockopt, /* ok */ 579 .sendmsg = inet_sendmsg, /* ok */ 580 .recvmsg = inet_recvmsg, /* ok */ 581 #ifdef CONFIG_MMU 582 .mmap = tcp_mmap, 583 #endif 584 .sendpage = inet_sendpage, 585 .sendmsg_locked = tcp_sendmsg_locked, 586 .sendpage_locked = tcp_sendpage_locked, 587 .splice_read = tcp_splice_read, 588 .read_sock = tcp_read_sock, 589 .peek_len = tcp_peek_len, 590 #ifdef CONFIG_COMPAT 591 .compat_setsockopt = compat_sock_common_setsockopt, 592 .compat_getsockopt = compat_sock_common_getsockopt, 593 #endif 594 .set_rcvlowat = tcp_set_rcvlowat, 595 }; 596 597 const struct proto_ops inet6_dgram_ops = { 598 .family = PF_INET6, 599 .owner = THIS_MODULE, 600 .release = inet6_release, 601 .bind = inet6_bind, 602 .connect = inet_dgram_connect, /* ok */ 603 .socketpair = sock_no_socketpair, /* a do nothing */ 604 .accept = sock_no_accept, /* a do nothing */ 605 .getname = inet6_getname, 606 .poll = udp_poll, /* ok */ 607 .ioctl = inet6_ioctl, /* must change */ 608 .listen = sock_no_listen, /* ok */ 609 .shutdown = inet_shutdown, /* ok */ 610 .setsockopt = sock_common_setsockopt, /* ok */ 611 .getsockopt = sock_common_getsockopt, /* ok */ 612 .sendmsg = inet_sendmsg, /* ok */ 613 .recvmsg = inet_recvmsg, /* ok */ 614 .mmap = sock_no_mmap, 615 .sendpage = sock_no_sendpage, 616 .set_peek_off = sk_set_peek_off, 617 #ifdef CONFIG_COMPAT 618 .compat_setsockopt = compat_sock_common_setsockopt, 619 .compat_getsockopt = compat_sock_common_getsockopt, 620 #endif 621 }; 622 623 static const struct net_proto_family inet6_family_ops = { 624 .family = PF_INET6, 625 .create = inet6_create, 626 .owner = THIS_MODULE, 627 }; 628 629 int inet6_register_protosw(struct inet_protosw *p) 630 { 631 struct list_head *lh; 632 struct inet_protosw *answer; 633 struct list_head *last_perm; 634 int protocol = p->protocol; 635 int ret; 636 637 spin_lock_bh(&inetsw6_lock); 638 639 ret = -EINVAL; 640 if (p->type >= SOCK_MAX) 641 goto out_illegal; 642 643 /* If we are trying to override a permanent protocol, bail. */ 644 answer = NULL; 645 ret = -EPERM; 646 last_perm = &inetsw6[p->type]; 647 list_for_each(lh, &inetsw6[p->type]) { 648 answer = list_entry(lh, struct inet_protosw, list); 649 650 /* Check only the non-wild match. */ 651 if (INET_PROTOSW_PERMANENT & answer->flags) { 652 if (protocol == answer->protocol) 653 break; 654 last_perm = lh; 655 } 656 657 answer = NULL; 658 } 659 if (answer) 660 goto out_permanent; 661 662 /* Add the new entry after the last permanent entry if any, so that 663 * the new entry does not override a permanent entry when matched with 664 * a wild-card protocol. But it is allowed to override any existing 665 * non-permanent entry. This means that when we remove this entry, the 666 * system automatically returns to the old behavior. 667 */ 668 list_add_rcu(&p->list, last_perm); 669 ret = 0; 670 out: 671 spin_unlock_bh(&inetsw6_lock); 672 return ret; 673 674 out_permanent: 675 pr_err("Attempt to override permanent protocol %d\n", protocol); 676 goto out; 677 678 out_illegal: 679 pr_err("Ignoring attempt to register invalid socket type %d\n", 680 p->type); 681 goto out; 682 } 683 EXPORT_SYMBOL(inet6_register_protosw); 684 685 void 686 inet6_unregister_protosw(struct inet_protosw *p) 687 { 688 if (INET_PROTOSW_PERMANENT & p->flags) { 689 pr_err("Attempt to unregister permanent protocol %d\n", 690 p->protocol); 691 } else { 692 spin_lock_bh(&inetsw6_lock); 693 list_del_rcu(&p->list); 694 spin_unlock_bh(&inetsw6_lock); 695 696 synchronize_net(); 697 } 698 } 699 EXPORT_SYMBOL(inet6_unregister_protosw); 700 701 int inet6_sk_rebuild_header(struct sock *sk) 702 { 703 struct ipv6_pinfo *np = inet6_sk(sk); 704 struct dst_entry *dst; 705 706 dst = __sk_dst_check(sk, np->dst_cookie); 707 708 if (!dst) { 709 struct inet_sock *inet = inet_sk(sk); 710 struct in6_addr *final_p, final; 711 struct flowi6 fl6; 712 713 memset(&fl6, 0, sizeof(fl6)); 714 fl6.flowi6_proto = sk->sk_protocol; 715 fl6.daddr = sk->sk_v6_daddr; 716 fl6.saddr = np->saddr; 717 fl6.flowlabel = np->flow_label; 718 fl6.flowi6_oif = sk->sk_bound_dev_if; 719 fl6.flowi6_mark = sk->sk_mark; 720 fl6.fl6_dport = inet->inet_dport; 721 fl6.fl6_sport = inet->inet_sport; 722 fl6.flowi6_uid = sk->sk_uid; 723 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 724 725 rcu_read_lock(); 726 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 727 &final); 728 rcu_read_unlock(); 729 730 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 731 if (IS_ERR(dst)) { 732 sk->sk_route_caps = 0; 733 sk->sk_err_soft = -PTR_ERR(dst); 734 return PTR_ERR(dst); 735 } 736 737 ip6_dst_store(sk, dst, NULL, NULL); 738 } 739 740 return 0; 741 } 742 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 743 744 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 745 const struct inet6_skb_parm *opt) 746 { 747 const struct ipv6_pinfo *np = inet6_sk(sk); 748 749 if (np->rxopt.all) { 750 if (((opt->flags & IP6SKB_HOPBYHOP) && 751 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 752 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 753 np->rxopt.bits.rxflow) || 754 (opt->srcrt && (np->rxopt.bits.srcrt || 755 np->rxopt.bits.osrcrt)) || 756 ((opt->dst1 || opt->dst0) && 757 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 758 return true; 759 } 760 return false; 761 } 762 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 763 764 static struct packet_type ipv6_packet_type __read_mostly = { 765 .type = cpu_to_be16(ETH_P_IPV6), 766 .func = ipv6_rcv, 767 .list_func = ipv6_list_rcv, 768 }; 769 770 static int __init ipv6_packet_init(void) 771 { 772 dev_add_pack(&ipv6_packet_type); 773 return 0; 774 } 775 776 static void ipv6_packet_cleanup(void) 777 { 778 dev_remove_pack(&ipv6_packet_type); 779 } 780 781 static int __net_init ipv6_init_mibs(struct net *net) 782 { 783 int i; 784 785 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 786 if (!net->mib.udp_stats_in6) 787 return -ENOMEM; 788 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 789 if (!net->mib.udplite_stats_in6) 790 goto err_udplite_mib; 791 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 792 if (!net->mib.ipv6_statistics) 793 goto err_ip_mib; 794 795 for_each_possible_cpu(i) { 796 struct ipstats_mib *af_inet6_stats; 797 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 798 u64_stats_init(&af_inet6_stats->syncp); 799 } 800 801 802 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 803 if (!net->mib.icmpv6_statistics) 804 goto err_icmp_mib; 805 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 806 GFP_KERNEL); 807 if (!net->mib.icmpv6msg_statistics) 808 goto err_icmpmsg_mib; 809 return 0; 810 811 err_icmpmsg_mib: 812 free_percpu(net->mib.icmpv6_statistics); 813 err_icmp_mib: 814 free_percpu(net->mib.ipv6_statistics); 815 err_ip_mib: 816 free_percpu(net->mib.udplite_stats_in6); 817 err_udplite_mib: 818 free_percpu(net->mib.udp_stats_in6); 819 return -ENOMEM; 820 } 821 822 static void ipv6_cleanup_mibs(struct net *net) 823 { 824 free_percpu(net->mib.udp_stats_in6); 825 free_percpu(net->mib.udplite_stats_in6); 826 free_percpu(net->mib.ipv6_statistics); 827 free_percpu(net->mib.icmpv6_statistics); 828 kfree(net->mib.icmpv6msg_statistics); 829 } 830 831 static int __net_init inet6_net_init(struct net *net) 832 { 833 int err = 0; 834 835 net->ipv6.sysctl.bindv6only = 0; 836 net->ipv6.sysctl.icmpv6_time = 1*HZ; 837 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0; 838 net->ipv6.sysctl.flowlabel_consistency = 1; 839 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 840 net->ipv6.sysctl.idgen_retries = 3; 841 net->ipv6.sysctl.idgen_delay = 1 * HZ; 842 net->ipv6.sysctl.flowlabel_state_ranges = 0; 843 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 844 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 845 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 846 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 847 atomic_set(&net->ipv6.fib6_sernum, 1); 848 849 err = ipv6_init_mibs(net); 850 if (err) 851 return err; 852 #ifdef CONFIG_PROC_FS 853 err = udp6_proc_init(net); 854 if (err) 855 goto out; 856 err = tcp6_proc_init(net); 857 if (err) 858 goto proc_tcp6_fail; 859 err = ac6_proc_init(net); 860 if (err) 861 goto proc_ac6_fail; 862 #endif 863 return err; 864 865 #ifdef CONFIG_PROC_FS 866 proc_ac6_fail: 867 tcp6_proc_exit(net); 868 proc_tcp6_fail: 869 udp6_proc_exit(net); 870 out: 871 ipv6_cleanup_mibs(net); 872 return err; 873 #endif 874 } 875 876 static void __net_exit inet6_net_exit(struct net *net) 877 { 878 #ifdef CONFIG_PROC_FS 879 udp6_proc_exit(net); 880 tcp6_proc_exit(net); 881 ac6_proc_exit(net); 882 #endif 883 ipv6_cleanup_mibs(net); 884 } 885 886 static struct pernet_operations inet6_net_ops = { 887 .init = inet6_net_init, 888 .exit = inet6_net_exit, 889 }; 890 891 static const struct ipv6_stub ipv6_stub_impl = { 892 .ipv6_sock_mc_join = ipv6_sock_mc_join, 893 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 894 .ipv6_dst_lookup = ip6_dst_lookup, 895 .fib6_get_table = fib6_get_table, 896 .fib6_table_lookup = fib6_table_lookup, 897 .fib6_lookup = fib6_lookup, 898 .fib6_multipath_select = fib6_multipath_select, 899 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6, 900 .udpv6_encap_enable = udpv6_encap_enable, 901 .ndisc_send_na = ndisc_send_na, 902 .nd_tbl = &nd_tbl, 903 }; 904 905 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = { 906 .inet6_bind = __inet6_bind, 907 .udp6_lib_lookup = __udp6_lib_lookup, 908 }; 909 910 static int __init inet6_init(void) 911 { 912 struct list_head *r; 913 int err = 0; 914 915 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 916 917 /* Register the socket-side information for inet6_create. */ 918 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 919 INIT_LIST_HEAD(r); 920 921 if (disable_ipv6_mod) { 922 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 923 goto out; 924 } 925 926 err = proto_register(&tcpv6_prot, 1); 927 if (err) 928 goto out; 929 930 err = proto_register(&udpv6_prot, 1); 931 if (err) 932 goto out_unregister_tcp_proto; 933 934 err = proto_register(&udplitev6_prot, 1); 935 if (err) 936 goto out_unregister_udp_proto; 937 938 err = proto_register(&rawv6_prot, 1); 939 if (err) 940 goto out_unregister_udplite_proto; 941 942 err = proto_register(&pingv6_prot, 1); 943 if (err) 944 goto out_unregister_raw_proto; 945 946 /* We MUST register RAW sockets before we create the ICMP6, 947 * IGMP6, or NDISC control sockets. 948 */ 949 err = rawv6_init(); 950 if (err) 951 goto out_unregister_ping_proto; 952 953 /* Register the family here so that the init calls below will 954 * be able to create sockets. (?? is this dangerous ??) 955 */ 956 err = sock_register(&inet6_family_ops); 957 if (err) 958 goto out_sock_register_fail; 959 960 /* 961 * ipngwg API draft makes clear that the correct semantics 962 * for TCP and UDP is to consider one TCP and UDP instance 963 * in a host available by both INET and INET6 APIs and 964 * able to communicate via both network protocols. 965 */ 966 967 err = register_pernet_subsys(&inet6_net_ops); 968 if (err) 969 goto register_pernet_fail; 970 err = ip6_mr_init(); 971 if (err) 972 goto ipmr_fail; 973 err = icmpv6_init(); 974 if (err) 975 goto icmp_fail; 976 err = ndisc_init(); 977 if (err) 978 goto ndisc_fail; 979 err = igmp6_init(); 980 if (err) 981 goto igmp_fail; 982 983 err = ipv6_netfilter_init(); 984 if (err) 985 goto netfilter_fail; 986 /* Create /proc/foo6 entries. */ 987 #ifdef CONFIG_PROC_FS 988 err = -ENOMEM; 989 if (raw6_proc_init()) 990 goto proc_raw6_fail; 991 if (udplite6_proc_init()) 992 goto proc_udplite6_fail; 993 if (ipv6_misc_proc_init()) 994 goto proc_misc6_fail; 995 if (if6_proc_init()) 996 goto proc_if6_fail; 997 #endif 998 err = ip6_route_init(); 999 if (err) 1000 goto ip6_route_fail; 1001 err = ndisc_late_init(); 1002 if (err) 1003 goto ndisc_late_fail; 1004 err = ip6_flowlabel_init(); 1005 if (err) 1006 goto ip6_flowlabel_fail; 1007 err = ipv6_anycast_init(); 1008 if (err) 1009 goto ipv6_anycast_fail; 1010 err = addrconf_init(); 1011 if (err) 1012 goto addrconf_fail; 1013 1014 /* Init v6 extension headers. */ 1015 err = ipv6_exthdrs_init(); 1016 if (err) 1017 goto ipv6_exthdrs_fail; 1018 1019 err = ipv6_frag_init(); 1020 if (err) 1021 goto ipv6_frag_fail; 1022 1023 /* Init v6 transport protocols. */ 1024 err = udpv6_init(); 1025 if (err) 1026 goto udpv6_fail; 1027 1028 err = udplitev6_init(); 1029 if (err) 1030 goto udplitev6_fail; 1031 1032 err = udpv6_offload_init(); 1033 if (err) 1034 goto udpv6_offload_fail; 1035 1036 err = tcpv6_init(); 1037 if (err) 1038 goto tcpv6_fail; 1039 1040 err = ipv6_packet_init(); 1041 if (err) 1042 goto ipv6_packet_fail; 1043 1044 err = pingv6_init(); 1045 if (err) 1046 goto pingv6_fail; 1047 1048 err = calipso_init(); 1049 if (err) 1050 goto calipso_fail; 1051 1052 err = seg6_init(); 1053 if (err) 1054 goto seg6_fail; 1055 1056 err = igmp6_late_init(); 1057 if (err) 1058 goto igmp6_late_err; 1059 1060 #ifdef CONFIG_SYSCTL 1061 err = ipv6_sysctl_register(); 1062 if (err) 1063 goto sysctl_fail; 1064 #endif 1065 1066 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1067 wmb(); 1068 ipv6_stub = &ipv6_stub_impl; 1069 ipv6_bpf_stub = &ipv6_bpf_stub_impl; 1070 out: 1071 return err; 1072 1073 #ifdef CONFIG_SYSCTL 1074 sysctl_fail: 1075 igmp6_late_cleanup(); 1076 #endif 1077 igmp6_late_err: 1078 seg6_exit(); 1079 seg6_fail: 1080 calipso_exit(); 1081 calipso_fail: 1082 pingv6_exit(); 1083 pingv6_fail: 1084 ipv6_packet_cleanup(); 1085 ipv6_packet_fail: 1086 tcpv6_exit(); 1087 tcpv6_fail: 1088 udpv6_offload_exit(); 1089 udpv6_offload_fail: 1090 udplitev6_exit(); 1091 udplitev6_fail: 1092 udpv6_exit(); 1093 udpv6_fail: 1094 ipv6_frag_exit(); 1095 ipv6_frag_fail: 1096 ipv6_exthdrs_exit(); 1097 ipv6_exthdrs_fail: 1098 addrconf_cleanup(); 1099 addrconf_fail: 1100 ipv6_anycast_cleanup(); 1101 ipv6_anycast_fail: 1102 ip6_flowlabel_cleanup(); 1103 ip6_flowlabel_fail: 1104 ndisc_late_cleanup(); 1105 ndisc_late_fail: 1106 ip6_route_cleanup(); 1107 ip6_route_fail: 1108 #ifdef CONFIG_PROC_FS 1109 if6_proc_exit(); 1110 proc_if6_fail: 1111 ipv6_misc_proc_exit(); 1112 proc_misc6_fail: 1113 udplite6_proc_exit(); 1114 proc_udplite6_fail: 1115 raw6_proc_exit(); 1116 proc_raw6_fail: 1117 #endif 1118 ipv6_netfilter_fini(); 1119 netfilter_fail: 1120 igmp6_cleanup(); 1121 igmp_fail: 1122 ndisc_cleanup(); 1123 ndisc_fail: 1124 icmpv6_cleanup(); 1125 icmp_fail: 1126 ip6_mr_cleanup(); 1127 ipmr_fail: 1128 unregister_pernet_subsys(&inet6_net_ops); 1129 register_pernet_fail: 1130 sock_unregister(PF_INET6); 1131 rtnl_unregister_all(PF_INET6); 1132 out_sock_register_fail: 1133 rawv6_exit(); 1134 out_unregister_ping_proto: 1135 proto_unregister(&pingv6_prot); 1136 out_unregister_raw_proto: 1137 proto_unregister(&rawv6_prot); 1138 out_unregister_udplite_proto: 1139 proto_unregister(&udplitev6_prot); 1140 out_unregister_udp_proto: 1141 proto_unregister(&udpv6_prot); 1142 out_unregister_tcp_proto: 1143 proto_unregister(&tcpv6_prot); 1144 goto out; 1145 } 1146 module_init(inet6_init); 1147 1148 MODULE_ALIAS_NETPROTO(PF_INET6); 1149