1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * PF_INET6 socket protocol family 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * 9 * Adapted from linux/net/ipv4/af_inet.c 10 * 11 * Fixes: 12 * piggy, Karl Knutson : Socket protocol table 13 * Hideaki YOSHIFUJI : sin6_scope_id support 14 * Arnaldo Melo : check proc_net_create return, cleanups 15 */ 16 17 #define pr_fmt(fmt) "IPv6: " fmt 18 19 #include <linux/module.h> 20 #include <linux/capability.h> 21 #include <linux/errno.h> 22 #include <linux/types.h> 23 #include <linux/socket.h> 24 #include <linux/in.h> 25 #include <linux/kernel.h> 26 #include <linux/timer.h> 27 #include <linux/string.h> 28 #include <linux/sockios.h> 29 #include <linux/net.h> 30 #include <linux/fcntl.h> 31 #include <linux/mm.h> 32 #include <linux/interrupt.h> 33 #include <linux/proc_fs.h> 34 #include <linux/stat.h> 35 #include <linux/init.h> 36 #include <linux/slab.h> 37 38 #include <linux/inet.h> 39 #include <linux/netdevice.h> 40 #include <linux/icmpv6.h> 41 #include <linux/netfilter_ipv6.h> 42 43 #include <net/ip.h> 44 #include <net/ipv6.h> 45 #include <net/udp.h> 46 #include <net/udplite.h> 47 #include <net/tcp.h> 48 #include <net/ping.h> 49 #include <net/protocol.h> 50 #include <net/inet_common.h> 51 #include <net/route.h> 52 #include <net/transp_v6.h> 53 #include <net/ip6_route.h> 54 #include <net/addrconf.h> 55 #include <net/ipv6_stubs.h> 56 #include <net/ndisc.h> 57 #ifdef CONFIG_IPV6_TUNNEL 58 #include <net/ip6_tunnel.h> 59 #endif 60 #include <net/calipso.h> 61 #include <net/seg6.h> 62 #include <net/rpl.h> 63 #include <net/compat.h> 64 #include <net/xfrm.h> 65 #include <net/ioam6.h> 66 #include <net/rawv6.h> 67 68 #include <linux/uaccess.h> 69 #include <linux/mroute6.h> 70 71 #include "ip6_offload.h" 72 73 MODULE_AUTHOR("Cast of dozens"); 74 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 75 MODULE_LICENSE("GPL"); 76 77 /* The inetsw6 table contains everything that inet6_create needs to 78 * build a new socket. 79 */ 80 static struct list_head inetsw6[SOCK_MAX]; 81 static DEFINE_SPINLOCK(inetsw6_lock); 82 83 struct ipv6_params ipv6_defaults = { 84 .disable_ipv6 = 0, 85 .autoconf = 1, 86 }; 87 88 static int disable_ipv6_mod; 89 90 module_param_named(disable, disable_ipv6_mod, int, 0444); 91 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 92 93 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 94 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 95 96 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 97 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 98 99 bool ipv6_mod_enabled(void) 100 { 101 return disable_ipv6_mod == 0; 102 } 103 EXPORT_SYMBOL_GPL(ipv6_mod_enabled); 104 105 static struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 106 { 107 const int offset = sk->sk_prot->ipv6_pinfo_offset; 108 109 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 110 } 111 112 void inet6_sock_destruct(struct sock *sk) 113 { 114 inet6_cleanup_sock(sk); 115 inet_sock_destruct(sk); 116 } 117 EXPORT_SYMBOL_GPL(inet6_sock_destruct); 118 119 static int inet6_create(struct net *net, struct socket *sock, int protocol, 120 int kern) 121 { 122 struct inet_sock *inet; 123 struct ipv6_pinfo *np; 124 struct sock *sk; 125 struct inet_protosw *answer; 126 struct proto *answer_prot; 127 unsigned char answer_flags; 128 int try_loading_module = 0; 129 int err; 130 131 if (protocol < 0 || protocol >= IPPROTO_MAX) 132 return -EINVAL; 133 134 /* Look for the requested type/protocol pair. */ 135 lookup_protocol: 136 err = -ESOCKTNOSUPPORT; 137 rcu_read_lock(); 138 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 139 140 err = 0; 141 /* Check the non-wild match. */ 142 if (protocol == answer->protocol) { 143 if (protocol != IPPROTO_IP) 144 break; 145 } else { 146 /* Check for the two wild cases. */ 147 if (IPPROTO_IP == protocol) { 148 protocol = answer->protocol; 149 break; 150 } 151 if (IPPROTO_IP == answer->protocol) 152 break; 153 } 154 err = -EPROTONOSUPPORT; 155 } 156 157 if (err) { 158 if (try_loading_module < 2) { 159 rcu_read_unlock(); 160 /* 161 * Be more specific, e.g. net-pf-10-proto-132-type-1 162 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 163 */ 164 if (++try_loading_module == 1) 165 request_module("net-pf-%d-proto-%d-type-%d", 166 PF_INET6, protocol, sock->type); 167 /* 168 * Fall back to generic, e.g. net-pf-10-proto-132 169 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 170 */ 171 else 172 request_module("net-pf-%d-proto-%d", 173 PF_INET6, protocol); 174 goto lookup_protocol; 175 } else 176 goto out_rcu_unlock; 177 } 178 179 err = -EPERM; 180 if (sock->type == SOCK_RAW && !kern && 181 !ns_capable(net->user_ns, CAP_NET_RAW)) 182 goto out_rcu_unlock; 183 184 sock->ops = answer->ops; 185 answer_prot = answer->prot; 186 answer_flags = answer->flags; 187 rcu_read_unlock(); 188 189 WARN_ON(!answer_prot->slab); 190 191 err = -ENOBUFS; 192 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 193 if (!sk) 194 goto out; 195 196 sock_init_data(sock, sk); 197 198 err = 0; 199 if (INET_PROTOSW_REUSE & answer_flags) 200 sk->sk_reuse = SK_CAN_REUSE; 201 202 if (INET_PROTOSW_ICSK & answer_flags) 203 inet_init_csk_locks(sk); 204 205 inet = inet_sk(sk); 206 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags); 207 208 if (SOCK_RAW == sock->type) { 209 inet->inet_num = protocol; 210 if (IPPROTO_RAW == protocol) 211 inet_set_bit(HDRINCL, sk); 212 } 213 214 sk->sk_destruct = inet6_sock_destruct; 215 sk->sk_family = PF_INET6; 216 sk->sk_protocol = protocol; 217 218 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 219 220 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 221 np->hop_limit = -1; 222 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 223 inet6_set_bit(MC6_LOOP, sk); 224 inet6_set_bit(MC6_ALL, sk); 225 np->pmtudisc = IPV6_PMTUDISC_WANT; 226 inet6_assign_bit(REPFLOW, sk, net->ipv6.sysctl.flowlabel_reflect & 227 FLOWLABEL_REFLECT_ESTABLISHED); 228 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 229 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash); 230 231 /* Init the ipv4 part of the socket since we can have sockets 232 * using v6 API for ipv4. 233 */ 234 inet->uc_ttl = -1; 235 236 inet_set_bit(MC_LOOP, sk); 237 inet->mc_ttl = 1; 238 inet->mc_index = 0; 239 RCU_INIT_POINTER(inet->mc_list, NULL); 240 inet->rcv_tos = 0; 241 242 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc)) 243 inet->pmtudisc = IP_PMTUDISC_DONT; 244 else 245 inet->pmtudisc = IP_PMTUDISC_WANT; 246 247 if (inet->inet_num) { 248 /* It assumes that any protocol which allows 249 * the user to assign a number at socket 250 * creation time automatically shares. 251 */ 252 inet->inet_sport = htons(inet->inet_num); 253 err = sk->sk_prot->hash(sk); 254 if (err) { 255 sk_common_release(sk); 256 goto out; 257 } 258 } 259 if (sk->sk_prot->init) { 260 err = sk->sk_prot->init(sk); 261 if (err) { 262 sk_common_release(sk); 263 goto out; 264 } 265 } 266 267 if (!kern) { 268 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 269 if (err) { 270 sk_common_release(sk); 271 goto out; 272 } 273 } 274 out: 275 return err; 276 out_rcu_unlock: 277 rcu_read_unlock(); 278 goto out; 279 } 280 281 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 282 u32 flags) 283 { 284 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 285 struct inet_sock *inet = inet_sk(sk); 286 struct ipv6_pinfo *np = inet6_sk(sk); 287 struct net *net = sock_net(sk); 288 __be32 v4addr = 0; 289 unsigned short snum; 290 bool saved_ipv6only; 291 int addr_type = 0; 292 int err = 0; 293 294 if (addr->sin6_family != AF_INET6) 295 return -EAFNOSUPPORT; 296 297 addr_type = ipv6_addr_type(&addr->sin6_addr); 298 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM) 299 return -EINVAL; 300 301 snum = ntohs(addr->sin6_port); 302 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) && 303 snum && inet_port_requires_bind_service(net, snum) && 304 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 305 return -EACCES; 306 307 if (flags & BIND_WITH_LOCK) 308 lock_sock(sk); 309 310 /* Check these errors (active socket, double bind). */ 311 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 312 err = -EINVAL; 313 goto out; 314 } 315 316 /* Check if the address belongs to the host. */ 317 if (addr_type == IPV6_ADDR_MAPPED) { 318 struct net_device *dev = NULL; 319 int chk_addr_ret; 320 321 /* Binding to v4-mapped address on a v6-only socket 322 * makes no sense 323 */ 324 if (ipv6_only_sock(sk)) { 325 err = -EINVAL; 326 goto out; 327 } 328 329 rcu_read_lock(); 330 if (sk->sk_bound_dev_if) { 331 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 332 if (!dev) { 333 err = -ENODEV; 334 goto out_unlock; 335 } 336 } 337 338 /* Reproduce AF_INET checks to make the bindings consistent */ 339 v4addr = addr->sin6_addr.s6_addr32[3]; 340 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr); 341 rcu_read_unlock(); 342 343 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr, 344 chk_addr_ret)) { 345 err = -EADDRNOTAVAIL; 346 goto out; 347 } 348 } else { 349 if (addr_type != IPV6_ADDR_ANY) { 350 struct net_device *dev = NULL; 351 352 rcu_read_lock(); 353 if (__ipv6_addr_needs_scope_id(addr_type)) { 354 if (addr_len >= sizeof(struct sockaddr_in6) && 355 addr->sin6_scope_id) { 356 /* Override any existing binding, if another one 357 * is supplied by user. 358 */ 359 sk->sk_bound_dev_if = addr->sin6_scope_id; 360 } 361 362 /* Binding to link-local address requires an interface */ 363 if (!sk->sk_bound_dev_if) { 364 err = -EINVAL; 365 goto out_unlock; 366 } 367 } 368 369 if (sk->sk_bound_dev_if) { 370 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 371 if (!dev) { 372 err = -ENODEV; 373 goto out_unlock; 374 } 375 } 376 377 /* ipv4 addr of the socket is invalid. Only the 378 * unspecified and mapped address have a v4 equivalent. 379 */ 380 v4addr = LOOPBACK4_IPV6; 381 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 382 if (!ipv6_can_nonlocal_bind(net, inet) && 383 !ipv6_chk_addr(net, &addr->sin6_addr, 384 dev, 0)) { 385 err = -EADDRNOTAVAIL; 386 goto out_unlock; 387 } 388 } 389 rcu_read_unlock(); 390 } 391 } 392 393 inet->inet_rcv_saddr = v4addr; 394 inet->inet_saddr = v4addr; 395 396 sk->sk_v6_rcv_saddr = addr->sin6_addr; 397 398 if (!(addr_type & IPV6_ADDR_MULTICAST)) 399 np->saddr = addr->sin6_addr; 400 401 saved_ipv6only = sk->sk_ipv6only; 402 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED) 403 sk->sk_ipv6only = 1; 404 405 /* Make sure we are allowed to bind here. */ 406 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) || 407 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 408 err = sk->sk_prot->get_port(sk, snum); 409 if (err) { 410 sk->sk_ipv6only = saved_ipv6only; 411 inet_reset_saddr(sk); 412 goto out; 413 } 414 if (!(flags & BIND_FROM_BPF)) { 415 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk); 416 if (err) { 417 sk->sk_ipv6only = saved_ipv6only; 418 inet_reset_saddr(sk); 419 if (sk->sk_prot->put_port) 420 sk->sk_prot->put_port(sk); 421 goto out; 422 } 423 } 424 } 425 426 if (addr_type != IPV6_ADDR_ANY) 427 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 428 if (snum) 429 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 430 inet->inet_sport = htons(inet->inet_num); 431 inet->inet_dport = 0; 432 inet->inet_daddr = 0; 433 out: 434 if (flags & BIND_WITH_LOCK) 435 release_sock(sk); 436 return err; 437 out_unlock: 438 rcu_read_unlock(); 439 goto out; 440 } 441 442 int inet6_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len) 443 { 444 u32 flags = BIND_WITH_LOCK; 445 const struct proto *prot; 446 int err = 0; 447 448 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 449 prot = READ_ONCE(sk->sk_prot); 450 /* If the socket has its own bind function then use it. */ 451 if (prot->bind) 452 return prot->bind(sk, uaddr, addr_len); 453 454 if (addr_len < SIN6_LEN_RFC2133) 455 return -EINVAL; 456 457 /* BPF prog is run before any checks are done so that if the prog 458 * changes context in a wrong way it will be caught. 459 */ 460 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len, 461 CGROUP_INET6_BIND, &flags); 462 if (err) 463 return err; 464 465 return __inet6_bind(sk, uaddr, addr_len, flags); 466 } 467 468 /* bind for INET6 API */ 469 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 470 { 471 return inet6_bind_sk(sock->sk, uaddr, addr_len); 472 } 473 EXPORT_SYMBOL(inet6_bind); 474 475 int inet6_release(struct socket *sock) 476 { 477 struct sock *sk = sock->sk; 478 479 if (!sk) 480 return -EINVAL; 481 482 /* Free mc lists */ 483 ipv6_sock_mc_close(sk); 484 485 /* Free ac lists */ 486 ipv6_sock_ac_close(sk); 487 488 return inet_release(sock); 489 } 490 EXPORT_SYMBOL(inet6_release); 491 492 void inet6_cleanup_sock(struct sock *sk) 493 { 494 struct ipv6_pinfo *np = inet6_sk(sk); 495 struct sk_buff *skb; 496 struct ipv6_txoptions *opt; 497 498 /* Release rx options */ 499 500 skb = xchg(&np->pktoptions, NULL); 501 kfree_skb(skb); 502 503 skb = xchg(&np->rxpmtu, NULL); 504 kfree_skb(skb); 505 506 /* Free flowlabels */ 507 fl6_free_socklist(sk); 508 509 /* Free tx options */ 510 511 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 512 if (opt) { 513 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 514 txopt_put(opt); 515 } 516 } 517 EXPORT_SYMBOL_GPL(inet6_cleanup_sock); 518 519 /* 520 * This does both peername and sockname. 521 */ 522 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 523 int peer) 524 { 525 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 526 int sin_addr_len = sizeof(*sin); 527 struct sock *sk = sock->sk; 528 struct inet_sock *inet = inet_sk(sk); 529 struct ipv6_pinfo *np = inet6_sk(sk); 530 531 sin->sin6_family = AF_INET6; 532 sin->sin6_flowinfo = 0; 533 sin->sin6_scope_id = 0; 534 lock_sock(sk); 535 if (peer) { 536 if (!inet->inet_dport || 537 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 538 peer == 1)) { 539 release_sock(sk); 540 return -ENOTCONN; 541 } 542 sin->sin6_port = inet->inet_dport; 543 sin->sin6_addr = sk->sk_v6_daddr; 544 if (inet6_test_bit(SNDFLOW, sk)) 545 sin->sin6_flowinfo = np->flow_label; 546 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len, 547 CGROUP_INET6_GETPEERNAME); 548 } else { 549 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 550 sin->sin6_addr = np->saddr; 551 else 552 sin->sin6_addr = sk->sk_v6_rcv_saddr; 553 sin->sin6_port = inet->inet_sport; 554 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len, 555 CGROUP_INET6_GETSOCKNAME); 556 } 557 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 558 sk->sk_bound_dev_if); 559 release_sock(sk); 560 return sin_addr_len; 561 } 562 EXPORT_SYMBOL(inet6_getname); 563 564 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 565 { 566 void __user *argp = (void __user *)arg; 567 struct sock *sk = sock->sk; 568 struct net *net = sock_net(sk); 569 const struct proto *prot; 570 571 switch (cmd) { 572 case SIOCADDRT: 573 case SIOCDELRT: { 574 struct in6_rtmsg rtmsg; 575 576 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg))) 577 return -EFAULT; 578 return ipv6_route_ioctl(net, cmd, &rtmsg); 579 } 580 case SIOCSIFADDR: 581 return addrconf_add_ifaddr(net, argp); 582 case SIOCDIFADDR: 583 return addrconf_del_ifaddr(net, argp); 584 case SIOCSIFDSTADDR: 585 return addrconf_set_dstaddr(net, argp); 586 default: 587 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 588 prot = READ_ONCE(sk->sk_prot); 589 if (!prot->ioctl) 590 return -ENOIOCTLCMD; 591 return sk_ioctl(sk, cmd, (void __user *)arg); 592 } 593 /*NOTREACHED*/ 594 return 0; 595 } 596 EXPORT_SYMBOL(inet6_ioctl); 597 598 #ifdef CONFIG_COMPAT 599 struct compat_in6_rtmsg { 600 struct in6_addr rtmsg_dst; 601 struct in6_addr rtmsg_src; 602 struct in6_addr rtmsg_gateway; 603 u32 rtmsg_type; 604 u16 rtmsg_dst_len; 605 u16 rtmsg_src_len; 606 u32 rtmsg_metric; 607 u32 rtmsg_info; 608 u32 rtmsg_flags; 609 s32 rtmsg_ifindex; 610 }; 611 612 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 613 struct compat_in6_rtmsg __user *ur) 614 { 615 struct in6_rtmsg rt; 616 617 if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst, 618 3 * sizeof(struct in6_addr)) || 619 get_user(rt.rtmsg_type, &ur->rtmsg_type) || 620 get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) || 621 get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) || 622 get_user(rt.rtmsg_metric, &ur->rtmsg_metric) || 623 get_user(rt.rtmsg_info, &ur->rtmsg_info) || 624 get_user(rt.rtmsg_flags, &ur->rtmsg_flags) || 625 get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex)) 626 return -EFAULT; 627 628 629 return ipv6_route_ioctl(sock_net(sk), cmd, &rt); 630 } 631 632 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 633 { 634 void __user *argp = compat_ptr(arg); 635 struct sock *sk = sock->sk; 636 637 switch (cmd) { 638 case SIOCADDRT: 639 case SIOCDELRT: 640 return inet6_compat_routing_ioctl(sk, cmd, argp); 641 default: 642 return -ENOIOCTLCMD; 643 } 644 } 645 EXPORT_SYMBOL_GPL(inet6_compat_ioctl); 646 #endif /* CONFIG_COMPAT */ 647 648 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *, 649 size_t)); 650 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 651 { 652 struct sock *sk = sock->sk; 653 const struct proto *prot; 654 655 if (unlikely(inet_send_prepare(sk))) 656 return -EAGAIN; 657 658 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 659 prot = READ_ONCE(sk->sk_prot); 660 return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg, 661 sk, msg, size); 662 } 663 664 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *, 665 size_t, int, int *)); 666 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 667 int flags) 668 { 669 struct sock *sk = sock->sk; 670 const struct proto *prot; 671 int addr_len = 0; 672 int err; 673 674 if (likely(!(flags & MSG_ERRQUEUE))) 675 sock_rps_record_flow(sk); 676 677 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 678 prot = READ_ONCE(sk->sk_prot); 679 err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg, 680 sk, msg, size, flags, &addr_len); 681 if (err >= 0) 682 msg->msg_namelen = addr_len; 683 return err; 684 } 685 686 const struct proto_ops inet6_stream_ops = { 687 .family = PF_INET6, 688 .owner = THIS_MODULE, 689 .release = inet6_release, 690 .bind = inet6_bind, 691 .connect = inet_stream_connect, /* ok */ 692 .socketpair = sock_no_socketpair, /* a do nothing */ 693 .accept = inet_accept, /* ok */ 694 .getname = inet6_getname, 695 .poll = tcp_poll, /* ok */ 696 .ioctl = inet6_ioctl, /* must change */ 697 .gettstamp = sock_gettstamp, 698 .listen = inet_listen, /* ok */ 699 .shutdown = inet_shutdown, /* ok */ 700 .setsockopt = sock_common_setsockopt, /* ok */ 701 .getsockopt = sock_common_getsockopt, /* ok */ 702 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 703 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 704 #ifdef CONFIG_MMU 705 .mmap = tcp_mmap, 706 #endif 707 .splice_eof = inet_splice_eof, 708 .sendmsg_locked = tcp_sendmsg_locked, 709 .splice_read = tcp_splice_read, 710 .read_sock = tcp_read_sock, 711 .read_skb = tcp_read_skb, 712 .peek_len = tcp_peek_len, 713 #ifdef CONFIG_COMPAT 714 .compat_ioctl = inet6_compat_ioctl, 715 #endif 716 .set_rcvlowat = tcp_set_rcvlowat, 717 }; 718 719 const struct proto_ops inet6_dgram_ops = { 720 .family = PF_INET6, 721 .owner = THIS_MODULE, 722 .release = inet6_release, 723 .bind = inet6_bind, 724 .connect = inet_dgram_connect, /* ok */ 725 .socketpair = sock_no_socketpair, /* a do nothing */ 726 .accept = sock_no_accept, /* a do nothing */ 727 .getname = inet6_getname, 728 .poll = udp_poll, /* ok */ 729 .ioctl = inet6_ioctl, /* must change */ 730 .gettstamp = sock_gettstamp, 731 .listen = sock_no_listen, /* ok */ 732 .shutdown = inet_shutdown, /* ok */ 733 .setsockopt = sock_common_setsockopt, /* ok */ 734 .getsockopt = sock_common_getsockopt, /* ok */ 735 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 736 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 737 .read_skb = udp_read_skb, 738 .mmap = sock_no_mmap, 739 .set_peek_off = sk_set_peek_off, 740 #ifdef CONFIG_COMPAT 741 .compat_ioctl = inet6_compat_ioctl, 742 #endif 743 }; 744 745 static const struct net_proto_family inet6_family_ops = { 746 .family = PF_INET6, 747 .create = inet6_create, 748 .owner = THIS_MODULE, 749 }; 750 751 int inet6_register_protosw(struct inet_protosw *p) 752 { 753 struct list_head *lh; 754 struct inet_protosw *answer; 755 struct list_head *last_perm; 756 int protocol = p->protocol; 757 int ret; 758 759 spin_lock_bh(&inetsw6_lock); 760 761 ret = -EINVAL; 762 if (p->type >= SOCK_MAX) 763 goto out_illegal; 764 765 /* If we are trying to override a permanent protocol, bail. */ 766 answer = NULL; 767 ret = -EPERM; 768 last_perm = &inetsw6[p->type]; 769 list_for_each(lh, &inetsw6[p->type]) { 770 answer = list_entry(lh, struct inet_protosw, list); 771 772 /* Check only the non-wild match. */ 773 if (INET_PROTOSW_PERMANENT & answer->flags) { 774 if (protocol == answer->protocol) 775 break; 776 last_perm = lh; 777 } 778 779 answer = NULL; 780 } 781 if (answer) 782 goto out_permanent; 783 784 /* Add the new entry after the last permanent entry if any, so that 785 * the new entry does not override a permanent entry when matched with 786 * a wild-card protocol. But it is allowed to override any existing 787 * non-permanent entry. This means that when we remove this entry, the 788 * system automatically returns to the old behavior. 789 */ 790 list_add_rcu(&p->list, last_perm); 791 ret = 0; 792 out: 793 spin_unlock_bh(&inetsw6_lock); 794 return ret; 795 796 out_permanent: 797 pr_err("Attempt to override permanent protocol %d\n", protocol); 798 goto out; 799 800 out_illegal: 801 pr_err("Ignoring attempt to register invalid socket type %d\n", 802 p->type); 803 goto out; 804 } 805 EXPORT_SYMBOL(inet6_register_protosw); 806 807 void 808 inet6_unregister_protosw(struct inet_protosw *p) 809 { 810 if (INET_PROTOSW_PERMANENT & p->flags) { 811 pr_err("Attempt to unregister permanent protocol %d\n", 812 p->protocol); 813 } else { 814 spin_lock_bh(&inetsw6_lock); 815 list_del_rcu(&p->list); 816 spin_unlock_bh(&inetsw6_lock); 817 818 synchronize_net(); 819 } 820 } 821 EXPORT_SYMBOL(inet6_unregister_protosw); 822 823 int inet6_sk_rebuild_header(struct sock *sk) 824 { 825 struct ipv6_pinfo *np = inet6_sk(sk); 826 struct dst_entry *dst; 827 828 dst = __sk_dst_check(sk, np->dst_cookie); 829 830 if (!dst) { 831 struct inet_sock *inet = inet_sk(sk); 832 struct in6_addr *final_p, final; 833 struct flowi6 fl6; 834 835 memset(&fl6, 0, sizeof(fl6)); 836 fl6.flowi6_proto = sk->sk_protocol; 837 fl6.daddr = sk->sk_v6_daddr; 838 fl6.saddr = np->saddr; 839 fl6.flowlabel = np->flow_label; 840 fl6.flowi6_oif = sk->sk_bound_dev_if; 841 fl6.flowi6_mark = sk->sk_mark; 842 fl6.fl6_dport = inet->inet_dport; 843 fl6.fl6_sport = inet->inet_sport; 844 fl6.flowi6_uid = sk->sk_uid; 845 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); 846 847 rcu_read_lock(); 848 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 849 &final); 850 rcu_read_unlock(); 851 852 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); 853 if (IS_ERR(dst)) { 854 sk->sk_route_caps = 0; 855 WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst)); 856 return PTR_ERR(dst); 857 } 858 859 ip6_dst_store(sk, dst, NULL, NULL); 860 } 861 862 return 0; 863 } 864 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 865 866 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 867 const struct inet6_skb_parm *opt) 868 { 869 const struct ipv6_pinfo *np = inet6_sk(sk); 870 871 if (np->rxopt.all) { 872 if (((opt->flags & IP6SKB_HOPBYHOP) && 873 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 874 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 875 np->rxopt.bits.rxflow) || 876 (opt->srcrt && (np->rxopt.bits.srcrt || 877 np->rxopt.bits.osrcrt)) || 878 ((opt->dst1 || opt->dst0) && 879 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 880 return true; 881 } 882 return false; 883 } 884 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 885 886 static struct packet_type ipv6_packet_type __read_mostly = { 887 .type = cpu_to_be16(ETH_P_IPV6), 888 .func = ipv6_rcv, 889 .list_func = ipv6_list_rcv, 890 }; 891 892 static int __init ipv6_packet_init(void) 893 { 894 dev_add_pack(&ipv6_packet_type); 895 return 0; 896 } 897 898 static void ipv6_packet_cleanup(void) 899 { 900 dev_remove_pack(&ipv6_packet_type); 901 } 902 903 static int __net_init ipv6_init_mibs(struct net *net) 904 { 905 int i; 906 907 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 908 if (!net->mib.udp_stats_in6) 909 return -ENOMEM; 910 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 911 if (!net->mib.udplite_stats_in6) 912 goto err_udplite_mib; 913 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 914 if (!net->mib.ipv6_statistics) 915 goto err_ip_mib; 916 917 for_each_possible_cpu(i) { 918 struct ipstats_mib *af_inet6_stats; 919 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 920 u64_stats_init(&af_inet6_stats->syncp); 921 } 922 923 924 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 925 if (!net->mib.icmpv6_statistics) 926 goto err_icmp_mib; 927 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 928 GFP_KERNEL); 929 if (!net->mib.icmpv6msg_statistics) 930 goto err_icmpmsg_mib; 931 return 0; 932 933 err_icmpmsg_mib: 934 free_percpu(net->mib.icmpv6_statistics); 935 err_icmp_mib: 936 free_percpu(net->mib.ipv6_statistics); 937 err_ip_mib: 938 free_percpu(net->mib.udplite_stats_in6); 939 err_udplite_mib: 940 free_percpu(net->mib.udp_stats_in6); 941 return -ENOMEM; 942 } 943 944 static void ipv6_cleanup_mibs(struct net *net) 945 { 946 free_percpu(net->mib.udp_stats_in6); 947 free_percpu(net->mib.udplite_stats_in6); 948 free_percpu(net->mib.ipv6_statistics); 949 free_percpu(net->mib.icmpv6_statistics); 950 kfree(net->mib.icmpv6msg_statistics); 951 } 952 953 static int __net_init inet6_net_init(struct net *net) 954 { 955 int err = 0; 956 957 net->ipv6.sysctl.bindv6only = 0; 958 net->ipv6.sysctl.icmpv6_time = 1*HZ; 959 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0; 960 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0; 961 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0; 962 net->ipv6.sysctl.icmpv6_error_anycast_as_unicast = 0; 963 964 /* By default, rate limit error messages. 965 * Except for pmtu discovery, it would break it. 966 * proc_do_large_bitmap needs pointer to the bitmap. 967 */ 968 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1); 969 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1); 970 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask; 971 972 net->ipv6.sysctl.flowlabel_consistency = 1; 973 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 974 net->ipv6.sysctl.idgen_retries = 3; 975 net->ipv6.sysctl.idgen_delay = 1 * HZ; 976 net->ipv6.sysctl.flowlabel_state_ranges = 0; 977 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 978 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 979 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 980 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 981 net->ipv6.sysctl.fib_notify_on_flag_change = 0; 982 atomic_set(&net->ipv6.fib6_sernum, 1); 983 984 net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID; 985 net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE; 986 987 err = ipv6_init_mibs(net); 988 if (err) 989 return err; 990 #ifdef CONFIG_PROC_FS 991 err = udp6_proc_init(net); 992 if (err) 993 goto out; 994 err = tcp6_proc_init(net); 995 if (err) 996 goto proc_tcp6_fail; 997 err = ac6_proc_init(net); 998 if (err) 999 goto proc_ac6_fail; 1000 #endif 1001 return err; 1002 1003 #ifdef CONFIG_PROC_FS 1004 proc_ac6_fail: 1005 tcp6_proc_exit(net); 1006 proc_tcp6_fail: 1007 udp6_proc_exit(net); 1008 out: 1009 ipv6_cleanup_mibs(net); 1010 return err; 1011 #endif 1012 } 1013 1014 static void __net_exit inet6_net_exit(struct net *net) 1015 { 1016 #ifdef CONFIG_PROC_FS 1017 udp6_proc_exit(net); 1018 tcp6_proc_exit(net); 1019 ac6_proc_exit(net); 1020 #endif 1021 ipv6_cleanup_mibs(net); 1022 } 1023 1024 static struct pernet_operations inet6_net_ops = { 1025 .init = inet6_net_init, 1026 .exit = inet6_net_exit, 1027 }; 1028 1029 static int ipv6_route_input(struct sk_buff *skb) 1030 { 1031 ip6_route_input(skb); 1032 return skb_dst(skb)->error; 1033 } 1034 1035 static const struct ipv6_stub ipv6_stub_impl = { 1036 .ipv6_sock_mc_join = ipv6_sock_mc_join, 1037 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 1038 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow, 1039 .ipv6_route_input = ipv6_route_input, 1040 .fib6_get_table = fib6_get_table, 1041 .fib6_table_lookup = fib6_table_lookup, 1042 .fib6_lookup = fib6_lookup, 1043 .fib6_select_path = fib6_select_path, 1044 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6, 1045 .fib6_nh_init = fib6_nh_init, 1046 .fib6_nh_release = fib6_nh_release, 1047 .fib6_nh_release_dsts = fib6_nh_release_dsts, 1048 .fib6_update_sernum = fib6_update_sernum_stub, 1049 .fib6_rt_update = fib6_rt_update, 1050 .ip6_del_rt = ip6_del_rt, 1051 .udpv6_encap_enable = udpv6_encap_enable, 1052 .ndisc_send_na = ndisc_send_na, 1053 #if IS_ENABLED(CONFIG_XFRM) 1054 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu, 1055 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv, 1056 .xfrm6_gro_udp_encap_rcv = xfrm6_gro_udp_encap_rcv, 1057 .xfrm6_rcv_encap = xfrm6_rcv_encap, 1058 #endif 1059 .nd_tbl = &nd_tbl, 1060 .ipv6_fragment = ip6_fragment, 1061 .ipv6_dev_find = ipv6_dev_find, 1062 }; 1063 1064 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = { 1065 .inet6_bind = __inet6_bind, 1066 .udp6_lib_lookup = __udp6_lib_lookup, 1067 .ipv6_setsockopt = do_ipv6_setsockopt, 1068 .ipv6_getsockopt = do_ipv6_getsockopt, 1069 .ipv6_dev_get_saddr = ipv6_dev_get_saddr, 1070 }; 1071 1072 static int __init inet6_init(void) 1073 { 1074 struct list_head *r; 1075 int err = 0; 1076 1077 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 1078 1079 /* Register the socket-side information for inet6_create. */ 1080 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 1081 INIT_LIST_HEAD(r); 1082 1083 raw_hashinfo_init(&raw_v6_hashinfo); 1084 1085 if (disable_ipv6_mod) { 1086 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 1087 goto out; 1088 } 1089 1090 err = proto_register(&tcpv6_prot, 1); 1091 if (err) 1092 goto out; 1093 1094 err = proto_register(&udpv6_prot, 1); 1095 if (err) 1096 goto out_unregister_tcp_proto; 1097 1098 err = proto_register(&udplitev6_prot, 1); 1099 if (err) 1100 goto out_unregister_udp_proto; 1101 1102 err = proto_register(&rawv6_prot, 1); 1103 if (err) 1104 goto out_unregister_udplite_proto; 1105 1106 err = proto_register(&pingv6_prot, 1); 1107 if (err) 1108 goto out_unregister_raw_proto; 1109 1110 /* We MUST register RAW sockets before we create the ICMP6, 1111 * IGMP6, or NDISC control sockets. 1112 */ 1113 err = rawv6_init(); 1114 if (err) 1115 goto out_unregister_ping_proto; 1116 1117 /* Register the family here so that the init calls below will 1118 * be able to create sockets. (?? is this dangerous ??) 1119 */ 1120 err = sock_register(&inet6_family_ops); 1121 if (err) 1122 goto out_sock_register_fail; 1123 1124 /* 1125 * ipngwg API draft makes clear that the correct semantics 1126 * for TCP and UDP is to consider one TCP and UDP instance 1127 * in a host available by both INET and INET6 APIs and 1128 * able to communicate via both network protocols. 1129 */ 1130 1131 err = register_pernet_subsys(&inet6_net_ops); 1132 if (err) 1133 goto register_pernet_fail; 1134 err = ip6_mr_init(); 1135 if (err) 1136 goto ipmr_fail; 1137 err = icmpv6_init(); 1138 if (err) 1139 goto icmp_fail; 1140 err = ndisc_init(); 1141 if (err) 1142 goto ndisc_fail; 1143 err = igmp6_init(); 1144 if (err) 1145 goto igmp_fail; 1146 1147 err = ipv6_netfilter_init(); 1148 if (err) 1149 goto netfilter_fail; 1150 /* Create /proc/foo6 entries. */ 1151 #ifdef CONFIG_PROC_FS 1152 err = -ENOMEM; 1153 if (raw6_proc_init()) 1154 goto proc_raw6_fail; 1155 if (udplite6_proc_init()) 1156 goto proc_udplite6_fail; 1157 if (ipv6_misc_proc_init()) 1158 goto proc_misc6_fail; 1159 if (if6_proc_init()) 1160 goto proc_if6_fail; 1161 #endif 1162 err = ip6_route_init(); 1163 if (err) 1164 goto ip6_route_fail; 1165 err = ndisc_late_init(); 1166 if (err) 1167 goto ndisc_late_fail; 1168 err = ip6_flowlabel_init(); 1169 if (err) 1170 goto ip6_flowlabel_fail; 1171 err = ipv6_anycast_init(); 1172 if (err) 1173 goto ipv6_anycast_fail; 1174 err = addrconf_init(); 1175 if (err) 1176 goto addrconf_fail; 1177 1178 /* Init v6 extension headers. */ 1179 err = ipv6_exthdrs_init(); 1180 if (err) 1181 goto ipv6_exthdrs_fail; 1182 1183 err = ipv6_frag_init(); 1184 if (err) 1185 goto ipv6_frag_fail; 1186 1187 /* Init v6 transport protocols. */ 1188 err = udpv6_init(); 1189 if (err) 1190 goto udpv6_fail; 1191 1192 err = udplitev6_init(); 1193 if (err) 1194 goto udplitev6_fail; 1195 1196 err = udpv6_offload_init(); 1197 if (err) 1198 goto udpv6_offload_fail; 1199 1200 err = tcpv6_init(); 1201 if (err) 1202 goto tcpv6_fail; 1203 1204 err = ipv6_packet_init(); 1205 if (err) 1206 goto ipv6_packet_fail; 1207 1208 err = pingv6_init(); 1209 if (err) 1210 goto pingv6_fail; 1211 1212 err = calipso_init(); 1213 if (err) 1214 goto calipso_fail; 1215 1216 err = seg6_init(); 1217 if (err) 1218 goto seg6_fail; 1219 1220 err = rpl_init(); 1221 if (err) 1222 goto rpl_fail; 1223 1224 err = ioam6_init(); 1225 if (err) 1226 goto ioam6_fail; 1227 1228 err = igmp6_late_init(); 1229 if (err) 1230 goto igmp6_late_err; 1231 1232 #ifdef CONFIG_SYSCTL 1233 err = ipv6_sysctl_register(); 1234 if (err) 1235 goto sysctl_fail; 1236 #endif 1237 1238 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1239 wmb(); 1240 ipv6_stub = &ipv6_stub_impl; 1241 ipv6_bpf_stub = &ipv6_bpf_stub_impl; 1242 out: 1243 return err; 1244 1245 #ifdef CONFIG_SYSCTL 1246 sysctl_fail: 1247 igmp6_late_cleanup(); 1248 #endif 1249 igmp6_late_err: 1250 ioam6_exit(); 1251 ioam6_fail: 1252 rpl_exit(); 1253 rpl_fail: 1254 seg6_exit(); 1255 seg6_fail: 1256 calipso_exit(); 1257 calipso_fail: 1258 pingv6_exit(); 1259 pingv6_fail: 1260 ipv6_packet_cleanup(); 1261 ipv6_packet_fail: 1262 tcpv6_exit(); 1263 tcpv6_fail: 1264 udpv6_offload_exit(); 1265 udpv6_offload_fail: 1266 udplitev6_exit(); 1267 udplitev6_fail: 1268 udpv6_exit(); 1269 udpv6_fail: 1270 ipv6_frag_exit(); 1271 ipv6_frag_fail: 1272 ipv6_exthdrs_exit(); 1273 ipv6_exthdrs_fail: 1274 addrconf_cleanup(); 1275 addrconf_fail: 1276 ipv6_anycast_cleanup(); 1277 ipv6_anycast_fail: 1278 ip6_flowlabel_cleanup(); 1279 ip6_flowlabel_fail: 1280 ndisc_late_cleanup(); 1281 ndisc_late_fail: 1282 ip6_route_cleanup(); 1283 ip6_route_fail: 1284 #ifdef CONFIG_PROC_FS 1285 if6_proc_exit(); 1286 proc_if6_fail: 1287 ipv6_misc_proc_exit(); 1288 proc_misc6_fail: 1289 udplite6_proc_exit(); 1290 proc_udplite6_fail: 1291 raw6_proc_exit(); 1292 proc_raw6_fail: 1293 #endif 1294 ipv6_netfilter_fini(); 1295 netfilter_fail: 1296 igmp6_cleanup(); 1297 igmp_fail: 1298 ndisc_cleanup(); 1299 ndisc_fail: 1300 icmpv6_cleanup(); 1301 icmp_fail: 1302 ip6_mr_cleanup(); 1303 ipmr_fail: 1304 unregister_pernet_subsys(&inet6_net_ops); 1305 register_pernet_fail: 1306 sock_unregister(PF_INET6); 1307 rtnl_unregister_all(PF_INET6); 1308 out_sock_register_fail: 1309 rawv6_exit(); 1310 out_unregister_ping_proto: 1311 proto_unregister(&pingv6_prot); 1312 out_unregister_raw_proto: 1313 proto_unregister(&rawv6_prot); 1314 out_unregister_udplite_proto: 1315 proto_unregister(&udplitev6_prot); 1316 out_unregister_udp_proto: 1317 proto_unregister(&udpv6_prot); 1318 out_unregister_tcp_proto: 1319 proto_unregister(&tcpv6_prot); 1320 goto out; 1321 } 1322 module_init(inet6_init); 1323 1324 MODULE_ALIAS_NETPROTO(PF_INET6); 1325