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 __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 106 { 107 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 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 } 117 118 static int inet6_create(struct net *net, struct socket *sock, int protocol, 119 int kern) 120 { 121 struct inet_sock *inet; 122 struct ipv6_pinfo *np; 123 struct sock *sk; 124 struct inet_protosw *answer; 125 struct proto *answer_prot; 126 unsigned char answer_flags; 127 int try_loading_module = 0; 128 int err; 129 130 if (protocol < 0 || protocol >= IPPROTO_MAX) 131 return -EINVAL; 132 133 /* Look for the requested type/protocol pair. */ 134 lookup_protocol: 135 err = -ESOCKTNOSUPPORT; 136 rcu_read_lock(); 137 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 138 139 err = 0; 140 /* Check the non-wild match. */ 141 if (protocol == answer->protocol) { 142 if (protocol != IPPROTO_IP) 143 break; 144 } else { 145 /* Check for the two wild cases. */ 146 if (IPPROTO_IP == protocol) { 147 protocol = answer->protocol; 148 break; 149 } 150 if (IPPROTO_IP == answer->protocol) 151 break; 152 } 153 err = -EPROTONOSUPPORT; 154 } 155 156 if (err) { 157 if (try_loading_module < 2) { 158 rcu_read_unlock(); 159 /* 160 * Be more specific, e.g. net-pf-10-proto-132-type-1 161 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 162 */ 163 if (++try_loading_module == 1) 164 request_module("net-pf-%d-proto-%d-type-%d", 165 PF_INET6, protocol, sock->type); 166 /* 167 * Fall back to generic, e.g. net-pf-10-proto-132 168 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 169 */ 170 else 171 request_module("net-pf-%d-proto-%d", 172 PF_INET6, protocol); 173 goto lookup_protocol; 174 } else 175 goto out_rcu_unlock; 176 } 177 178 err = -EPERM; 179 if (sock->type == SOCK_RAW && !kern && 180 !ns_capable(net->user_ns, CAP_NET_RAW)) 181 goto out_rcu_unlock; 182 183 sock->ops = answer->ops; 184 answer_prot = answer->prot; 185 answer_flags = answer->flags; 186 rcu_read_unlock(); 187 188 WARN_ON(!answer_prot->slab); 189 190 err = -ENOBUFS; 191 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 192 if (!sk) 193 goto out; 194 195 sock_init_data(sock, sk); 196 197 err = 0; 198 if (INET_PROTOSW_REUSE & answer_flags) 199 sk->sk_reuse = SK_CAN_REUSE; 200 201 inet = inet_sk(sk); 202 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 203 204 if (SOCK_RAW == sock->type) { 205 inet->inet_num = protocol; 206 if (IPPROTO_RAW == protocol) 207 inet->hdrincl = 1; 208 } 209 210 sk->sk_destruct = inet6_sock_destruct; 211 sk->sk_family = PF_INET6; 212 sk->sk_protocol = protocol; 213 214 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 215 216 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 217 np->hop_limit = -1; 218 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 219 np->mc_loop = 1; 220 np->mc_all = 1; 221 np->pmtudisc = IPV6_PMTUDISC_WANT; 222 np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED; 223 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 224 225 /* Init the ipv4 part of the socket since we can have sockets 226 * using v6 API for ipv4. 227 */ 228 inet->uc_ttl = -1; 229 230 inet->mc_loop = 1; 231 inet->mc_ttl = 1; 232 inet->mc_index = 0; 233 RCU_INIT_POINTER(inet->mc_list, NULL); 234 inet->rcv_tos = 0; 235 236 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc)) 237 inet->pmtudisc = IP_PMTUDISC_DONT; 238 else 239 inet->pmtudisc = IP_PMTUDISC_WANT; 240 /* 241 * Increment only the relevant sk_prot->socks debug field, this changes 242 * the previous behaviour of incrementing both the equivalent to 243 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 244 * 245 * This allows better debug granularity as we'll know exactly how many 246 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 247 * transport protocol socks. -acme 248 */ 249 sk_refcnt_debug_inc(sk); 250 251 if (inet->inet_num) { 252 /* It assumes that any protocol which allows 253 * the user to assign a number at socket 254 * creation time automatically shares. 255 */ 256 inet->inet_sport = htons(inet->inet_num); 257 err = sk->sk_prot->hash(sk); 258 if (err) { 259 sk_common_release(sk); 260 goto out; 261 } 262 } 263 if (sk->sk_prot->init) { 264 err = sk->sk_prot->init(sk); 265 if (err) { 266 sk_common_release(sk); 267 goto out; 268 } 269 } 270 271 if (!kern) { 272 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 273 if (err) { 274 sk_common_release(sk); 275 goto out; 276 } 277 } 278 out: 279 return err; 280 out_rcu_unlock: 281 rcu_read_unlock(); 282 goto out; 283 } 284 285 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 286 u32 flags) 287 { 288 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 289 struct inet_sock *inet = inet_sk(sk); 290 struct ipv6_pinfo *np = inet6_sk(sk); 291 struct net *net = sock_net(sk); 292 __be32 v4addr = 0; 293 unsigned short snum; 294 bool saved_ipv6only; 295 int addr_type = 0; 296 int err = 0; 297 298 if (addr->sin6_family != AF_INET6) 299 return -EAFNOSUPPORT; 300 301 addr_type = ipv6_addr_type(&addr->sin6_addr); 302 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM) 303 return -EINVAL; 304 305 snum = ntohs(addr->sin6_port); 306 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) && 307 snum && inet_port_requires_bind_service(net, snum) && 308 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 309 return -EACCES; 310 311 if (flags & BIND_WITH_LOCK) 312 lock_sock(sk); 313 314 /* Check these errors (active socket, double bind). */ 315 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 316 err = -EINVAL; 317 goto out; 318 } 319 320 /* Check if the address belongs to the host. */ 321 if (addr_type == IPV6_ADDR_MAPPED) { 322 struct net_device *dev = NULL; 323 int chk_addr_ret; 324 325 /* Binding to v4-mapped address on a v6-only socket 326 * makes no sense 327 */ 328 if (ipv6_only_sock(sk)) { 329 err = -EINVAL; 330 goto out; 331 } 332 333 rcu_read_lock(); 334 if (sk->sk_bound_dev_if) { 335 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 336 if (!dev) { 337 err = -ENODEV; 338 goto out_unlock; 339 } 340 } 341 342 /* Reproduce AF_INET checks to make the bindings consistent */ 343 v4addr = addr->sin6_addr.s6_addr32[3]; 344 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr); 345 rcu_read_unlock(); 346 347 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr, 348 chk_addr_ret)) { 349 err = -EADDRNOTAVAIL; 350 goto out; 351 } 352 } else { 353 if (addr_type != IPV6_ADDR_ANY) { 354 struct net_device *dev = NULL; 355 356 rcu_read_lock(); 357 if (__ipv6_addr_needs_scope_id(addr_type)) { 358 if (addr_len >= sizeof(struct sockaddr_in6) && 359 addr->sin6_scope_id) { 360 /* Override any existing binding, if another one 361 * is supplied by user. 362 */ 363 sk->sk_bound_dev_if = addr->sin6_scope_id; 364 } 365 366 /* Binding to link-local address requires an interface */ 367 if (!sk->sk_bound_dev_if) { 368 err = -EINVAL; 369 goto out_unlock; 370 } 371 } 372 373 if (sk->sk_bound_dev_if) { 374 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 375 if (!dev) { 376 err = -ENODEV; 377 goto out_unlock; 378 } 379 } 380 381 /* ipv4 addr of the socket is invalid. Only the 382 * unspecified and mapped address have a v4 equivalent. 383 */ 384 v4addr = LOOPBACK4_IPV6; 385 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 386 if (!ipv6_can_nonlocal_bind(net, inet) && 387 !ipv6_chk_addr(net, &addr->sin6_addr, 388 dev, 0)) { 389 err = -EADDRNOTAVAIL; 390 goto out_unlock; 391 } 392 } 393 rcu_read_unlock(); 394 } 395 } 396 397 inet->inet_rcv_saddr = v4addr; 398 inet->inet_saddr = v4addr; 399 400 sk->sk_v6_rcv_saddr = addr->sin6_addr; 401 402 if (!(addr_type & IPV6_ADDR_MULTICAST)) 403 np->saddr = addr->sin6_addr; 404 405 saved_ipv6only = sk->sk_ipv6only; 406 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED) 407 sk->sk_ipv6only = 1; 408 409 /* Make sure we are allowed to bind here. */ 410 if (snum || !(inet->bind_address_no_port || 411 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 412 if (sk->sk_prot->get_port(sk, snum)) { 413 sk->sk_ipv6only = saved_ipv6only; 414 inet_reset_saddr(sk); 415 err = -EADDRINUSE; 416 goto out; 417 } 418 if (!(flags & BIND_FROM_BPF)) { 419 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk); 420 if (err) { 421 sk->sk_ipv6only = saved_ipv6only; 422 inet_reset_saddr(sk); 423 if (sk->sk_prot->put_port) 424 sk->sk_prot->put_port(sk); 425 goto out; 426 } 427 } 428 } 429 430 if (addr_type != IPV6_ADDR_ANY) 431 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 432 if (snum) 433 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 434 inet->inet_sport = htons(inet->inet_num); 435 inet->inet_dport = 0; 436 inet->inet_daddr = 0; 437 out: 438 if (flags & BIND_WITH_LOCK) 439 release_sock(sk); 440 return err; 441 out_unlock: 442 rcu_read_unlock(); 443 goto out; 444 } 445 446 /* bind for INET6 API */ 447 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 448 { 449 struct sock *sk = sock->sk; 450 u32 flags = BIND_WITH_LOCK; 451 const struct proto *prot; 452 int err = 0; 453 454 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 455 prot = READ_ONCE(sk->sk_prot); 456 /* If the socket has its own bind function then use it. */ 457 if (prot->bind) 458 return prot->bind(sk, uaddr, addr_len); 459 460 if (addr_len < SIN6_LEN_RFC2133) 461 return -EINVAL; 462 463 /* BPF prog is run before any checks are done so that if the prog 464 * changes context in a wrong way it will be caught. 465 */ 466 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, 467 CGROUP_INET6_BIND, &flags); 468 if (err) 469 return err; 470 471 return __inet6_bind(sk, uaddr, addr_len, flags); 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_destroy_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_destroy_sock); 518 519 void inet6_cleanup_sock(struct sock *sk) 520 { 521 inet6_destroy_sock(sk); 522 } 523 EXPORT_SYMBOL_GPL(inet6_cleanup_sock); 524 525 /* 526 * This does both peername and sockname. 527 */ 528 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 529 int peer) 530 { 531 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 532 struct sock *sk = sock->sk; 533 struct inet_sock *inet = inet_sk(sk); 534 struct ipv6_pinfo *np = inet6_sk(sk); 535 536 sin->sin6_family = AF_INET6; 537 sin->sin6_flowinfo = 0; 538 sin->sin6_scope_id = 0; 539 lock_sock(sk); 540 if (peer) { 541 if (!inet->inet_dport || 542 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 543 peer == 1)) { 544 release_sock(sk); 545 return -ENOTCONN; 546 } 547 sin->sin6_port = inet->inet_dport; 548 sin->sin6_addr = sk->sk_v6_daddr; 549 if (np->sndflow) 550 sin->sin6_flowinfo = np->flow_label; 551 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, 552 CGROUP_INET6_GETPEERNAME); 553 } else { 554 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 555 sin->sin6_addr = np->saddr; 556 else 557 sin->sin6_addr = sk->sk_v6_rcv_saddr; 558 sin->sin6_port = inet->inet_sport; 559 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, 560 CGROUP_INET6_GETSOCKNAME); 561 } 562 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 563 sk->sk_bound_dev_if); 564 release_sock(sk); 565 return sizeof(*sin); 566 } 567 EXPORT_SYMBOL(inet6_getname); 568 569 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 570 { 571 void __user *argp = (void __user *)arg; 572 struct sock *sk = sock->sk; 573 struct net *net = sock_net(sk); 574 const struct proto *prot; 575 576 switch (cmd) { 577 case SIOCADDRT: 578 case SIOCDELRT: { 579 struct in6_rtmsg rtmsg; 580 581 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg))) 582 return -EFAULT; 583 return ipv6_route_ioctl(net, cmd, &rtmsg); 584 } 585 case SIOCSIFADDR: 586 return addrconf_add_ifaddr(net, argp); 587 case SIOCDIFADDR: 588 return addrconf_del_ifaddr(net, argp); 589 case SIOCSIFDSTADDR: 590 return addrconf_set_dstaddr(net, argp); 591 default: 592 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 593 prot = READ_ONCE(sk->sk_prot); 594 if (!prot->ioctl) 595 return -ENOIOCTLCMD; 596 return prot->ioctl(sk, cmd, arg); 597 } 598 /*NOTREACHED*/ 599 return 0; 600 } 601 EXPORT_SYMBOL(inet6_ioctl); 602 603 #ifdef CONFIG_COMPAT 604 struct compat_in6_rtmsg { 605 struct in6_addr rtmsg_dst; 606 struct in6_addr rtmsg_src; 607 struct in6_addr rtmsg_gateway; 608 u32 rtmsg_type; 609 u16 rtmsg_dst_len; 610 u16 rtmsg_src_len; 611 u32 rtmsg_metric; 612 u32 rtmsg_info; 613 u32 rtmsg_flags; 614 s32 rtmsg_ifindex; 615 }; 616 617 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 618 struct compat_in6_rtmsg __user *ur) 619 { 620 struct in6_rtmsg rt; 621 622 if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst, 623 3 * sizeof(struct in6_addr)) || 624 get_user(rt.rtmsg_type, &ur->rtmsg_type) || 625 get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) || 626 get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) || 627 get_user(rt.rtmsg_metric, &ur->rtmsg_metric) || 628 get_user(rt.rtmsg_info, &ur->rtmsg_info) || 629 get_user(rt.rtmsg_flags, &ur->rtmsg_flags) || 630 get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex)) 631 return -EFAULT; 632 633 634 return ipv6_route_ioctl(sock_net(sk), cmd, &rt); 635 } 636 637 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 638 { 639 void __user *argp = compat_ptr(arg); 640 struct sock *sk = sock->sk; 641 642 switch (cmd) { 643 case SIOCADDRT: 644 case SIOCDELRT: 645 return inet6_compat_routing_ioctl(sk, cmd, argp); 646 default: 647 return -ENOIOCTLCMD; 648 } 649 } 650 EXPORT_SYMBOL_GPL(inet6_compat_ioctl); 651 #endif /* CONFIG_COMPAT */ 652 653 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *, 654 size_t)); 655 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 656 { 657 struct sock *sk = sock->sk; 658 const struct proto *prot; 659 660 if (unlikely(inet_send_prepare(sk))) 661 return -EAGAIN; 662 663 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 664 prot = READ_ONCE(sk->sk_prot); 665 return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg, 666 sk, msg, size); 667 } 668 669 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *, 670 size_t, int, int *)); 671 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 672 int flags) 673 { 674 struct sock *sk = sock->sk; 675 const struct proto *prot; 676 int addr_len = 0; 677 int err; 678 679 if (likely(!(flags & MSG_ERRQUEUE))) 680 sock_rps_record_flow(sk); 681 682 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 683 prot = READ_ONCE(sk->sk_prot); 684 err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg, 685 sk, msg, size, flags, &addr_len); 686 if (err >= 0) 687 msg->msg_namelen = addr_len; 688 return err; 689 } 690 691 const struct proto_ops inet6_stream_ops = { 692 .family = PF_INET6, 693 .owner = THIS_MODULE, 694 .release = inet6_release, 695 .bind = inet6_bind, 696 .connect = inet_stream_connect, /* ok */ 697 .socketpair = sock_no_socketpair, /* a do nothing */ 698 .accept = inet_accept, /* ok */ 699 .getname = inet6_getname, 700 .poll = tcp_poll, /* ok */ 701 .ioctl = inet6_ioctl, /* must change */ 702 .gettstamp = sock_gettstamp, 703 .listen = inet_listen, /* ok */ 704 .shutdown = inet_shutdown, /* ok */ 705 .setsockopt = sock_common_setsockopt, /* ok */ 706 .getsockopt = sock_common_getsockopt, /* ok */ 707 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 708 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 709 #ifdef CONFIG_MMU 710 .mmap = tcp_mmap, 711 #endif 712 .sendpage = inet_sendpage, 713 .sendmsg_locked = tcp_sendmsg_locked, 714 .sendpage_locked = tcp_sendpage_locked, 715 .splice_read = tcp_splice_read, 716 .read_sock = tcp_read_sock, 717 .read_skb = tcp_read_skb, 718 .peek_len = tcp_peek_len, 719 #ifdef CONFIG_COMPAT 720 .compat_ioctl = inet6_compat_ioctl, 721 #endif 722 .set_rcvlowat = tcp_set_rcvlowat, 723 }; 724 725 const struct proto_ops inet6_dgram_ops = { 726 .family = PF_INET6, 727 .owner = THIS_MODULE, 728 .release = inet6_release, 729 .bind = inet6_bind, 730 .connect = inet_dgram_connect, /* ok */ 731 .socketpair = sock_no_socketpair, /* a do nothing */ 732 .accept = sock_no_accept, /* a do nothing */ 733 .getname = inet6_getname, 734 .poll = udp_poll, /* ok */ 735 .ioctl = inet6_ioctl, /* must change */ 736 .gettstamp = sock_gettstamp, 737 .listen = sock_no_listen, /* ok */ 738 .shutdown = inet_shutdown, /* ok */ 739 .setsockopt = sock_common_setsockopt, /* ok */ 740 .getsockopt = sock_common_getsockopt, /* ok */ 741 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 742 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 743 .read_skb = udp_read_skb, 744 .mmap = sock_no_mmap, 745 .sendpage = sock_no_sendpage, 746 .set_peek_off = sk_set_peek_off, 747 #ifdef CONFIG_COMPAT 748 .compat_ioctl = inet6_compat_ioctl, 749 #endif 750 }; 751 752 static const struct net_proto_family inet6_family_ops = { 753 .family = PF_INET6, 754 .create = inet6_create, 755 .owner = THIS_MODULE, 756 }; 757 758 int inet6_register_protosw(struct inet_protosw *p) 759 { 760 struct list_head *lh; 761 struct inet_protosw *answer; 762 struct list_head *last_perm; 763 int protocol = p->protocol; 764 int ret; 765 766 spin_lock_bh(&inetsw6_lock); 767 768 ret = -EINVAL; 769 if (p->type >= SOCK_MAX) 770 goto out_illegal; 771 772 /* If we are trying to override a permanent protocol, bail. */ 773 answer = NULL; 774 ret = -EPERM; 775 last_perm = &inetsw6[p->type]; 776 list_for_each(lh, &inetsw6[p->type]) { 777 answer = list_entry(lh, struct inet_protosw, list); 778 779 /* Check only the non-wild match. */ 780 if (INET_PROTOSW_PERMANENT & answer->flags) { 781 if (protocol == answer->protocol) 782 break; 783 last_perm = lh; 784 } 785 786 answer = NULL; 787 } 788 if (answer) 789 goto out_permanent; 790 791 /* Add the new entry after the last permanent entry if any, so that 792 * the new entry does not override a permanent entry when matched with 793 * a wild-card protocol. But it is allowed to override any existing 794 * non-permanent entry. This means that when we remove this entry, the 795 * system automatically returns to the old behavior. 796 */ 797 list_add_rcu(&p->list, last_perm); 798 ret = 0; 799 out: 800 spin_unlock_bh(&inetsw6_lock); 801 return ret; 802 803 out_permanent: 804 pr_err("Attempt to override permanent protocol %d\n", protocol); 805 goto out; 806 807 out_illegal: 808 pr_err("Ignoring attempt to register invalid socket type %d\n", 809 p->type); 810 goto out; 811 } 812 EXPORT_SYMBOL(inet6_register_protosw); 813 814 void 815 inet6_unregister_protosw(struct inet_protosw *p) 816 { 817 if (INET_PROTOSW_PERMANENT & p->flags) { 818 pr_err("Attempt to unregister permanent protocol %d\n", 819 p->protocol); 820 } else { 821 spin_lock_bh(&inetsw6_lock); 822 list_del_rcu(&p->list); 823 spin_unlock_bh(&inetsw6_lock); 824 825 synchronize_net(); 826 } 827 } 828 EXPORT_SYMBOL(inet6_unregister_protosw); 829 830 int inet6_sk_rebuild_header(struct sock *sk) 831 { 832 struct ipv6_pinfo *np = inet6_sk(sk); 833 struct dst_entry *dst; 834 835 dst = __sk_dst_check(sk, np->dst_cookie); 836 837 if (!dst) { 838 struct inet_sock *inet = inet_sk(sk); 839 struct in6_addr *final_p, final; 840 struct flowi6 fl6; 841 842 memset(&fl6, 0, sizeof(fl6)); 843 fl6.flowi6_proto = sk->sk_protocol; 844 fl6.daddr = sk->sk_v6_daddr; 845 fl6.saddr = np->saddr; 846 fl6.flowlabel = np->flow_label; 847 fl6.flowi6_oif = sk->sk_bound_dev_if; 848 fl6.flowi6_mark = sk->sk_mark; 849 fl6.fl6_dport = inet->inet_dport; 850 fl6.fl6_sport = inet->inet_sport; 851 fl6.flowi6_uid = sk->sk_uid; 852 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); 853 854 rcu_read_lock(); 855 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 856 &final); 857 rcu_read_unlock(); 858 859 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); 860 if (IS_ERR(dst)) { 861 sk->sk_route_caps = 0; 862 sk->sk_err_soft = -PTR_ERR(dst); 863 return PTR_ERR(dst); 864 } 865 866 ip6_dst_store(sk, dst, NULL, NULL); 867 } 868 869 return 0; 870 } 871 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 872 873 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 874 const struct inet6_skb_parm *opt) 875 { 876 const struct ipv6_pinfo *np = inet6_sk(sk); 877 878 if (np->rxopt.all) { 879 if (((opt->flags & IP6SKB_HOPBYHOP) && 880 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 881 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 882 np->rxopt.bits.rxflow) || 883 (opt->srcrt && (np->rxopt.bits.srcrt || 884 np->rxopt.bits.osrcrt)) || 885 ((opt->dst1 || opt->dst0) && 886 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 887 return true; 888 } 889 return false; 890 } 891 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 892 893 static struct packet_type ipv6_packet_type __read_mostly = { 894 .type = cpu_to_be16(ETH_P_IPV6), 895 .func = ipv6_rcv, 896 .list_func = ipv6_list_rcv, 897 }; 898 899 static int __init ipv6_packet_init(void) 900 { 901 dev_add_pack(&ipv6_packet_type); 902 return 0; 903 } 904 905 static void ipv6_packet_cleanup(void) 906 { 907 dev_remove_pack(&ipv6_packet_type); 908 } 909 910 static int __net_init ipv6_init_mibs(struct net *net) 911 { 912 int i; 913 914 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 915 if (!net->mib.udp_stats_in6) 916 return -ENOMEM; 917 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 918 if (!net->mib.udplite_stats_in6) 919 goto err_udplite_mib; 920 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 921 if (!net->mib.ipv6_statistics) 922 goto err_ip_mib; 923 924 for_each_possible_cpu(i) { 925 struct ipstats_mib *af_inet6_stats; 926 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 927 u64_stats_init(&af_inet6_stats->syncp); 928 } 929 930 931 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 932 if (!net->mib.icmpv6_statistics) 933 goto err_icmp_mib; 934 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 935 GFP_KERNEL); 936 if (!net->mib.icmpv6msg_statistics) 937 goto err_icmpmsg_mib; 938 return 0; 939 940 err_icmpmsg_mib: 941 free_percpu(net->mib.icmpv6_statistics); 942 err_icmp_mib: 943 free_percpu(net->mib.ipv6_statistics); 944 err_ip_mib: 945 free_percpu(net->mib.udplite_stats_in6); 946 err_udplite_mib: 947 free_percpu(net->mib.udp_stats_in6); 948 return -ENOMEM; 949 } 950 951 static void ipv6_cleanup_mibs(struct net *net) 952 { 953 free_percpu(net->mib.udp_stats_in6); 954 free_percpu(net->mib.udplite_stats_in6); 955 free_percpu(net->mib.ipv6_statistics); 956 free_percpu(net->mib.icmpv6_statistics); 957 kfree(net->mib.icmpv6msg_statistics); 958 } 959 960 static int __net_init inet6_net_init(struct net *net) 961 { 962 int err = 0; 963 964 net->ipv6.sysctl.bindv6only = 0; 965 net->ipv6.sysctl.icmpv6_time = 1*HZ; 966 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0; 967 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0; 968 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0; 969 970 /* By default, rate limit error messages. 971 * Except for pmtu discovery, it would break it. 972 * proc_do_large_bitmap needs pointer to the bitmap. 973 */ 974 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1); 975 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1); 976 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask; 977 978 net->ipv6.sysctl.flowlabel_consistency = 1; 979 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 980 net->ipv6.sysctl.idgen_retries = 3; 981 net->ipv6.sysctl.idgen_delay = 1 * HZ; 982 net->ipv6.sysctl.flowlabel_state_ranges = 0; 983 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 984 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 985 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 986 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 987 net->ipv6.sysctl.fib_notify_on_flag_change = 0; 988 atomic_set(&net->ipv6.fib6_sernum, 1); 989 990 net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID; 991 net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE; 992 993 err = ipv6_init_mibs(net); 994 if (err) 995 return err; 996 #ifdef CONFIG_PROC_FS 997 err = udp6_proc_init(net); 998 if (err) 999 goto out; 1000 err = tcp6_proc_init(net); 1001 if (err) 1002 goto proc_tcp6_fail; 1003 err = ac6_proc_init(net); 1004 if (err) 1005 goto proc_ac6_fail; 1006 #endif 1007 return err; 1008 1009 #ifdef CONFIG_PROC_FS 1010 proc_ac6_fail: 1011 tcp6_proc_exit(net); 1012 proc_tcp6_fail: 1013 udp6_proc_exit(net); 1014 out: 1015 ipv6_cleanup_mibs(net); 1016 return err; 1017 #endif 1018 } 1019 1020 static void __net_exit inet6_net_exit(struct net *net) 1021 { 1022 #ifdef CONFIG_PROC_FS 1023 udp6_proc_exit(net); 1024 tcp6_proc_exit(net); 1025 ac6_proc_exit(net); 1026 #endif 1027 ipv6_cleanup_mibs(net); 1028 } 1029 1030 static struct pernet_operations inet6_net_ops = { 1031 .init = inet6_net_init, 1032 .exit = inet6_net_exit, 1033 }; 1034 1035 static int ipv6_route_input(struct sk_buff *skb) 1036 { 1037 ip6_route_input(skb); 1038 return skb_dst(skb)->error; 1039 } 1040 1041 static const struct ipv6_stub ipv6_stub_impl = { 1042 .ipv6_sock_mc_join = ipv6_sock_mc_join, 1043 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 1044 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow, 1045 .ipv6_route_input = ipv6_route_input, 1046 .fib6_get_table = fib6_get_table, 1047 .fib6_table_lookup = fib6_table_lookup, 1048 .fib6_lookup = fib6_lookup, 1049 .fib6_select_path = fib6_select_path, 1050 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6, 1051 .fib6_nh_init = fib6_nh_init, 1052 .fib6_nh_release = fib6_nh_release, 1053 .fib6_nh_release_dsts = fib6_nh_release_dsts, 1054 .fib6_update_sernum = fib6_update_sernum_stub, 1055 .fib6_rt_update = fib6_rt_update, 1056 .ip6_del_rt = ip6_del_rt, 1057 .udpv6_encap_enable = udpv6_encap_enable, 1058 .ndisc_send_na = ndisc_send_na, 1059 #if IS_ENABLED(CONFIG_XFRM) 1060 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu, 1061 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv, 1062 .xfrm6_rcv_encap = xfrm6_rcv_encap, 1063 #endif 1064 .nd_tbl = &nd_tbl, 1065 .ipv6_fragment = ip6_fragment, 1066 .ipv6_dev_find = ipv6_dev_find, 1067 }; 1068 1069 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = { 1070 .inet6_bind = __inet6_bind, 1071 .udp6_lib_lookup = __udp6_lib_lookup, 1072 .ipv6_setsockopt = do_ipv6_setsockopt, 1073 .ipv6_getsockopt = do_ipv6_getsockopt, 1074 }; 1075 1076 static int __init inet6_init(void) 1077 { 1078 struct list_head *r; 1079 int err = 0; 1080 1081 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 1082 1083 /* Register the socket-side information for inet6_create. */ 1084 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 1085 INIT_LIST_HEAD(r); 1086 1087 raw_hashinfo_init(&raw_v6_hashinfo); 1088 1089 if (disable_ipv6_mod) { 1090 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 1091 goto out; 1092 } 1093 1094 err = proto_register(&tcpv6_prot, 1); 1095 if (err) 1096 goto out; 1097 1098 err = proto_register(&udpv6_prot, 1); 1099 if (err) 1100 goto out_unregister_tcp_proto; 1101 1102 err = proto_register(&udplitev6_prot, 1); 1103 if (err) 1104 goto out_unregister_udp_proto; 1105 1106 err = proto_register(&rawv6_prot, 1); 1107 if (err) 1108 goto out_unregister_udplite_proto; 1109 1110 err = proto_register(&pingv6_prot, 1); 1111 if (err) 1112 goto out_unregister_raw_proto; 1113 1114 /* We MUST register RAW sockets before we create the ICMP6, 1115 * IGMP6, or NDISC control sockets. 1116 */ 1117 err = rawv6_init(); 1118 if (err) 1119 goto out_unregister_ping_proto; 1120 1121 /* Register the family here so that the init calls below will 1122 * be able to create sockets. (?? is this dangerous ??) 1123 */ 1124 err = sock_register(&inet6_family_ops); 1125 if (err) 1126 goto out_sock_register_fail; 1127 1128 /* 1129 * ipngwg API draft makes clear that the correct semantics 1130 * for TCP and UDP is to consider one TCP and UDP instance 1131 * in a host available by both INET and INET6 APIs and 1132 * able to communicate via both network protocols. 1133 */ 1134 1135 err = register_pernet_subsys(&inet6_net_ops); 1136 if (err) 1137 goto register_pernet_fail; 1138 err = ip6_mr_init(); 1139 if (err) 1140 goto ipmr_fail; 1141 err = icmpv6_init(); 1142 if (err) 1143 goto icmp_fail; 1144 err = ndisc_init(); 1145 if (err) 1146 goto ndisc_fail; 1147 err = igmp6_init(); 1148 if (err) 1149 goto igmp_fail; 1150 1151 err = ipv6_netfilter_init(); 1152 if (err) 1153 goto netfilter_fail; 1154 /* Create /proc/foo6 entries. */ 1155 #ifdef CONFIG_PROC_FS 1156 err = -ENOMEM; 1157 if (raw6_proc_init()) 1158 goto proc_raw6_fail; 1159 if (udplite6_proc_init()) 1160 goto proc_udplite6_fail; 1161 if (ipv6_misc_proc_init()) 1162 goto proc_misc6_fail; 1163 if (if6_proc_init()) 1164 goto proc_if6_fail; 1165 #endif 1166 err = ip6_route_init(); 1167 if (err) 1168 goto ip6_route_fail; 1169 err = ndisc_late_init(); 1170 if (err) 1171 goto ndisc_late_fail; 1172 err = ip6_flowlabel_init(); 1173 if (err) 1174 goto ip6_flowlabel_fail; 1175 err = ipv6_anycast_init(); 1176 if (err) 1177 goto ipv6_anycast_fail; 1178 err = addrconf_init(); 1179 if (err) 1180 goto addrconf_fail; 1181 1182 /* Init v6 extension headers. */ 1183 err = ipv6_exthdrs_init(); 1184 if (err) 1185 goto ipv6_exthdrs_fail; 1186 1187 err = ipv6_frag_init(); 1188 if (err) 1189 goto ipv6_frag_fail; 1190 1191 /* Init v6 transport protocols. */ 1192 err = udpv6_init(); 1193 if (err) 1194 goto udpv6_fail; 1195 1196 err = udplitev6_init(); 1197 if (err) 1198 goto udplitev6_fail; 1199 1200 err = udpv6_offload_init(); 1201 if (err) 1202 goto udpv6_offload_fail; 1203 1204 err = tcpv6_init(); 1205 if (err) 1206 goto tcpv6_fail; 1207 1208 err = ipv6_packet_init(); 1209 if (err) 1210 goto ipv6_packet_fail; 1211 1212 err = pingv6_init(); 1213 if (err) 1214 goto pingv6_fail; 1215 1216 err = calipso_init(); 1217 if (err) 1218 goto calipso_fail; 1219 1220 err = seg6_init(); 1221 if (err) 1222 goto seg6_fail; 1223 1224 err = rpl_init(); 1225 if (err) 1226 goto rpl_fail; 1227 1228 err = ioam6_init(); 1229 if (err) 1230 goto ioam6_fail; 1231 1232 err = igmp6_late_init(); 1233 if (err) 1234 goto igmp6_late_err; 1235 1236 #ifdef CONFIG_SYSCTL 1237 err = ipv6_sysctl_register(); 1238 if (err) 1239 goto sysctl_fail; 1240 #endif 1241 1242 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1243 wmb(); 1244 ipv6_stub = &ipv6_stub_impl; 1245 ipv6_bpf_stub = &ipv6_bpf_stub_impl; 1246 out: 1247 return err; 1248 1249 #ifdef CONFIG_SYSCTL 1250 sysctl_fail: 1251 igmp6_late_cleanup(); 1252 #endif 1253 igmp6_late_err: 1254 ioam6_exit(); 1255 ioam6_fail: 1256 rpl_exit(); 1257 rpl_fail: 1258 seg6_exit(); 1259 seg6_fail: 1260 calipso_exit(); 1261 calipso_fail: 1262 pingv6_exit(); 1263 pingv6_fail: 1264 ipv6_packet_cleanup(); 1265 ipv6_packet_fail: 1266 tcpv6_exit(); 1267 tcpv6_fail: 1268 udpv6_offload_exit(); 1269 udpv6_offload_fail: 1270 udplitev6_exit(); 1271 udplitev6_fail: 1272 udpv6_exit(); 1273 udpv6_fail: 1274 ipv6_frag_exit(); 1275 ipv6_frag_fail: 1276 ipv6_exthdrs_exit(); 1277 ipv6_exthdrs_fail: 1278 addrconf_cleanup(); 1279 addrconf_fail: 1280 ipv6_anycast_cleanup(); 1281 ipv6_anycast_fail: 1282 ip6_flowlabel_cleanup(); 1283 ip6_flowlabel_fail: 1284 ndisc_late_cleanup(); 1285 ndisc_late_fail: 1286 ip6_route_cleanup(); 1287 ip6_route_fail: 1288 #ifdef CONFIG_PROC_FS 1289 if6_proc_exit(); 1290 proc_if6_fail: 1291 ipv6_misc_proc_exit(); 1292 proc_misc6_fail: 1293 udplite6_proc_exit(); 1294 proc_udplite6_fail: 1295 raw6_proc_exit(); 1296 proc_raw6_fail: 1297 #endif 1298 ipv6_netfilter_fini(); 1299 netfilter_fail: 1300 igmp6_cleanup(); 1301 igmp_fail: 1302 ndisc_cleanup(); 1303 ndisc_fail: 1304 icmpv6_cleanup(); 1305 icmp_fail: 1306 ip6_mr_cleanup(); 1307 ipmr_fail: 1308 unregister_pernet_subsys(&inet6_net_ops); 1309 register_pernet_fail: 1310 sock_unregister(PF_INET6); 1311 rtnl_unregister_all(PF_INET6); 1312 out_sock_register_fail: 1313 rawv6_exit(); 1314 out_unregister_ping_proto: 1315 proto_unregister(&pingv6_prot); 1316 out_unregister_raw_proto: 1317 proto_unregister(&rawv6_prot); 1318 out_unregister_udplite_proto: 1319 proto_unregister(&udplitev6_prot); 1320 out_unregister_udp_proto: 1321 proto_unregister(&udpv6_prot); 1322 out_unregister_tcp_proto: 1323 proto_unregister(&tcpv6_prot); 1324 goto out; 1325 } 1326 module_init(inet6_init); 1327 1328 MODULE_ALIAS_NETPROTO(PF_INET6); 1329