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 66#include <linux/uaccess.h> 67#include <linux/mroute6.h> 68 69#include "ip6_offload.h" 70 71MODULE_AUTHOR("Cast of dozens"); 72MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 73MODULE_LICENSE("GPL"); 74 75/* The inetsw6 table contains everything that inet6_create needs to 76 * build a new socket. 77 */ 78static struct list_head inetsw6[SOCK_MAX]; 79static DEFINE_SPINLOCK(inetsw6_lock); 80 81struct ipv6_params ipv6_defaults = { 82 .disable_ipv6 = 0, 83 .autoconf = 1, 84}; 85 86static int disable_ipv6_mod; 87 88module_param_named(disable, disable_ipv6_mod, int, 0444); 89MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 90 91module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 92MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 93 94module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 95MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 96 97bool ipv6_mod_enabled(void) 98{ 99 return disable_ipv6_mod == 0; 100} 101EXPORT_SYMBOL_GPL(ipv6_mod_enabled); 102 103static __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 110void inet6_sock_destruct(struct sock *sk) 111{ 112 inet6_cleanup_sock(sk); 113 inet_sock_destruct(sk); 114} 115EXPORT_SYMBOL_GPL(inet6_sock_destruct); 116 117static int inet6_create(struct net *net, struct socket *sock, int protocol, 118 int kern) 119{ 120 struct inet_sock *inet; 121 struct ipv6_pinfo *np; 122 struct sock *sk; 123 struct inet_protosw *answer; 124 struct proto *answer_prot; 125 unsigned char answer_flags; 126 int try_loading_module = 0; 127 int err; 128 129 if (protocol < 0 || protocol >= IPPROTO_MAX) 130 return -EINVAL; 131 132 /* Look for the requested type/protocol pair. */ 133lookup_protocol: 134 err = -ESOCKTNOSUPPORT; 135 rcu_read_lock(); 136 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 137 138 err = 0; 139 /* Check the non-wild match. */ 140 if (protocol == answer->protocol) { 141 if (protocol != IPPROTO_IP) 142 break; 143 } else { 144 /* Check for the two wild cases. */ 145 if (IPPROTO_IP == protocol) { 146 protocol = answer->protocol; 147 break; 148 } 149 if (IPPROTO_IP == answer->protocol) 150 break; 151 } 152 err = -EPROTONOSUPPORT; 153 } 154 155 if (err) { 156 if (try_loading_module < 2) { 157 rcu_read_unlock(); 158 /* 159 * Be more specific, e.g. net-pf-10-proto-132-type-1 160 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 161 */ 162 if (++try_loading_module == 1) 163 request_module("net-pf-%d-proto-%d-type-%d", 164 PF_INET6, protocol, sock->type); 165 /* 166 * Fall back to generic, e.g. net-pf-10-proto-132 167 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 168 */ 169 else 170 request_module("net-pf-%d-proto-%d", 171 PF_INET6, protocol); 172 goto lookup_protocol; 173 } else 174 goto out_rcu_unlock; 175 } 176 177 err = -EPERM; 178 if (sock->type == SOCK_RAW && !kern && 179 !ns_capable(net->user_ns, CAP_NET_RAW)) 180 goto out_rcu_unlock; 181 182 sock->ops = answer->ops; 183 answer_prot = answer->prot; 184 answer_flags = answer->flags; 185 rcu_read_unlock(); 186 187 WARN_ON(!answer_prot->slab); 188 189 err = -ENOBUFS; 190 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 191 if (!sk) 192 goto out; 193 194 sock_init_data(sock, sk); 195 196 err = 0; 197 if (INET_PROTOSW_REUSE & answer_flags) 198 sk->sk_reuse = SK_CAN_REUSE; 199 200 if (INET_PROTOSW_ICSK & answer_flags) 201 inet_init_csk_locks(sk); 202 203 inet = inet_sk(sk); 204 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 205 206 if (SOCK_RAW == sock->type) { 207 inet->inet_num = protocol; 208 if (IPPROTO_RAW == protocol) 209 inet->hdrincl = 1; 210 } 211 212 sk->sk_destruct = inet6_sock_destruct; 213 sk->sk_family = PF_INET6; 214 sk->sk_protocol = protocol; 215 216 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 217 218 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 219 np->hop_limit = -1; 220 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 221 np->mc_loop = 1; 222 np->mc_all = 1; 223 np->pmtudisc = IPV6_PMTUDISC_WANT; 224 np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED; 225 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 226 227 /* Init the ipv4 part of the socket since we can have sockets 228 * using v6 API for ipv4. 229 */ 230 inet->uc_ttl = -1; 231 232 inet->mc_loop = 1; 233 inet->mc_ttl = 1; 234 inet->mc_index = 0; 235 inet->mc_list = NULL; 236 inet->rcv_tos = 0; 237 238 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc)) 239 inet->pmtudisc = IP_PMTUDISC_DONT; 240 else 241 inet->pmtudisc = IP_PMTUDISC_WANT; 242 /* 243 * Increment only the relevant sk_prot->socks debug field, this changes 244 * the previous behaviour of incrementing both the equivalent to 245 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 246 * 247 * This allows better debug granularity as we'll know exactly how many 248 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 249 * transport protocol socks. -acme 250 */ 251 sk_refcnt_debug_inc(sk); 252 253 if (inet->inet_num) { 254 /* It assumes that any protocol which allows 255 * the user to assign a number at socket 256 * creation time automatically shares. 257 */ 258 inet->inet_sport = htons(inet->inet_num); 259 err = sk->sk_prot->hash(sk); 260 if (err) { 261 sk_common_release(sk); 262 goto out; 263 } 264 } 265 if (sk->sk_prot->init) { 266 err = sk->sk_prot->init(sk); 267 if (err) { 268 sk_common_release(sk); 269 goto out; 270 } 271 } 272 273 if (!kern) { 274 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 275 if (err) { 276 sk_common_release(sk); 277 goto out; 278 } 279 } 280out: 281 return err; 282out_rcu_unlock: 283 rcu_read_unlock(); 284 goto out; 285} 286 287static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 288 u32 flags) 289{ 290 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 291 struct inet_sock *inet = inet_sk(sk); 292 struct ipv6_pinfo *np = inet6_sk(sk); 293 struct net *net = sock_net(sk); 294 __be32 v4addr = 0; 295 unsigned short snum; 296 bool saved_ipv6only; 297 int addr_type = 0; 298 int err = 0; 299 300 if (addr->sin6_family != AF_INET6) 301 return -EAFNOSUPPORT; 302 303 addr_type = ipv6_addr_type(&addr->sin6_addr); 304 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM) 305 return -EINVAL; 306 307 snum = ntohs(addr->sin6_port); 308 if (snum && inet_port_requires_bind_service(net, snum) && 309 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 310 return -EACCES; 311 312 if (flags & BIND_WITH_LOCK) 313 lock_sock(sk); 314 315 /* Check these errors (active socket, double bind). */ 316 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 317 err = -EINVAL; 318 goto out; 319 } 320 321 /* Check if the address belongs to the host. */ 322 if (addr_type == IPV6_ADDR_MAPPED) { 323 struct net_device *dev = NULL; 324 int chk_addr_ret; 325 326 /* Binding to v4-mapped address on a v6-only socket 327 * makes no sense 328 */ 329 if (sk->sk_ipv6only) { 330 err = -EINVAL; 331 goto out; 332 } 333 334 rcu_read_lock(); 335 if (sk->sk_bound_dev_if) { 336 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 337 if (!dev) { 338 err = -ENODEV; 339 goto out_unlock; 340 } 341 } 342 343 /* Reproduce AF_INET checks to make the bindings consistent */ 344 v4addr = addr->sin6_addr.s6_addr32[3]; 345 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr); 346 rcu_read_unlock(); 347 348 if (!inet_can_nonlocal_bind(net, inet) && 349 v4addr != htonl(INADDR_ANY) && 350 chk_addr_ret != RTN_LOCAL && 351 chk_addr_ret != RTN_MULTICAST && 352 chk_addr_ret != RTN_BROADCAST) { 353 err = -EADDRNOTAVAIL; 354 goto out; 355 } 356 } else { 357 if (addr_type != IPV6_ADDR_ANY) { 358 struct net_device *dev = NULL; 359 360 rcu_read_lock(); 361 if (__ipv6_addr_needs_scope_id(addr_type)) { 362 if (addr_len >= sizeof(struct sockaddr_in6) && 363 addr->sin6_scope_id) { 364 /* Override any existing binding, if another one 365 * is supplied by user. 366 */ 367 sk->sk_bound_dev_if = addr->sin6_scope_id; 368 } 369 370 /* Binding to link-local address requires an interface */ 371 if (!sk->sk_bound_dev_if) { 372 err = -EINVAL; 373 goto out_unlock; 374 } 375 } 376 377 if (sk->sk_bound_dev_if) { 378 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 379 if (!dev) { 380 err = -ENODEV; 381 goto out_unlock; 382 } 383 } 384 385 /* ipv4 addr of the socket is invalid. Only the 386 * unspecified and mapped address have a v4 equivalent. 387 */ 388 v4addr = LOOPBACK4_IPV6; 389 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 390 if (!ipv6_can_nonlocal_bind(net, inet) && 391 !ipv6_chk_addr(net, &addr->sin6_addr, 392 dev, 0)) { 393 err = -EADDRNOTAVAIL; 394 goto out_unlock; 395 } 396 } 397 rcu_read_unlock(); 398 } 399 } 400 401 inet->inet_rcv_saddr = v4addr; 402 inet->inet_saddr = v4addr; 403 404 sk->sk_v6_rcv_saddr = addr->sin6_addr; 405 406 if (!(addr_type & IPV6_ADDR_MULTICAST)) 407 np->saddr = addr->sin6_addr; 408 409 saved_ipv6only = sk->sk_ipv6only; 410 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED) 411 sk->sk_ipv6only = 1; 412 413 /* Make sure we are allowed to bind here. */ 414 if (snum || !(inet->bind_address_no_port || 415 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 416 if (sk->sk_prot->get_port(sk, snum)) { 417 sk->sk_ipv6only = saved_ipv6only; 418 inet_reset_saddr(sk); 419 err = -EADDRINUSE; 420 goto out; 421 } 422 if (!(flags & BIND_FROM_BPF)) { 423 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk); 424 if (err) { 425 sk->sk_ipv6only = saved_ipv6only; 426 inet_reset_saddr(sk); 427 goto out; 428 } 429 } 430 } 431 432 if (addr_type != IPV6_ADDR_ANY) 433 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 434 if (snum) 435 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 436 inet->inet_sport = htons(inet->inet_num); 437 inet->inet_dport = 0; 438 inet->inet_daddr = 0; 439out: 440 if (flags & BIND_WITH_LOCK) 441 release_sock(sk); 442 return err; 443out_unlock: 444 rcu_read_unlock(); 445 goto out; 446} 447 448/* bind for INET6 API */ 449int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 450{ 451 struct sock *sk = sock->sk; 452 const struct proto *prot; 453 int err = 0; 454 455 /* If the socket has its own bind function then use it. */ 456 prot = READ_ONCE(sk->sk_prot); 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_INET6_BIND(sk, uaddr); 467 if (err) 468 return err; 469 470 return __inet6_bind(sk, uaddr, addr_len, BIND_WITH_LOCK); 471} 472EXPORT_SYMBOL(inet6_bind); 473 474int inet6_release(struct socket *sock) 475{ 476 struct sock *sk = sock->sk; 477 478 if (!sk) 479 return -EINVAL; 480 481 /* Free mc lists */ 482 ipv6_sock_mc_close(sk); 483 484 /* Free ac lists */ 485 ipv6_sock_ac_close(sk); 486 487 return inet_release(sock); 488} 489EXPORT_SYMBOL(inet6_release); 490 491void inet6_destroy_sock(struct sock *sk) 492{ 493 struct ipv6_pinfo *np = inet6_sk(sk); 494 struct sk_buff *skb; 495 struct ipv6_txoptions *opt; 496 497 /* Release rx options */ 498 499 skb = xchg(&np->pktoptions, NULL); 500 kfree_skb(skb); 501 502 skb = xchg(&np->rxpmtu, NULL); 503 kfree_skb(skb); 504 505 /* Free flowlabels */ 506 fl6_free_socklist(sk); 507 508 /* Free tx options */ 509 510 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 511 if (opt) { 512 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 513 txopt_put(opt); 514 } 515} 516EXPORT_SYMBOL_GPL(inet6_destroy_sock); 517 518void inet6_cleanup_sock(struct sock *sk) 519{ 520 inet6_destroy_sock(sk); 521} 522EXPORT_SYMBOL_GPL(inet6_cleanup_sock); 523 524/* 525 * This does both peername and sockname. 526 */ 527int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 528 int peer) 529{ 530 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 531 struct sock *sk = sock->sk; 532 struct inet_sock *inet = inet_sk(sk); 533 struct ipv6_pinfo *np = inet6_sk(sk); 534 535 sin->sin6_family = AF_INET6; 536 sin->sin6_flowinfo = 0; 537 sin->sin6_scope_id = 0; 538 if (peer) { 539 if (!inet->inet_dport) 540 return -ENOTCONN; 541 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 542 peer == 1) 543 return -ENOTCONN; 544 sin->sin6_port = inet->inet_dport; 545 sin->sin6_addr = sk->sk_v6_daddr; 546 if (np->sndflow) 547 sin->sin6_flowinfo = np->flow_label; 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 } 555 if (cgroup_bpf_enabled) 556 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin, 557 peer ? BPF_CGROUP_INET6_GETPEERNAME : 558 BPF_CGROUP_INET6_GETSOCKNAME, 559 NULL); 560 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 561 sk->sk_bound_dev_if); 562 return sizeof(*sin); 563} 564EXPORT_SYMBOL(inet6_getname); 565 566int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 567{ 568 void __user *argp = (void __user *)arg; 569 struct sock *sk = sock->sk; 570 struct net *net = sock_net(sk); 571 const struct proto *prot; 572 573 switch (cmd) { 574 case SIOCADDRT: 575 case SIOCDELRT: { 576 struct in6_rtmsg rtmsg; 577 578 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg))) 579 return -EFAULT; 580 return ipv6_route_ioctl(net, cmd, &rtmsg); 581 } 582 case SIOCSIFADDR: 583 return addrconf_add_ifaddr(net, argp); 584 case SIOCDIFADDR: 585 return addrconf_del_ifaddr(net, argp); 586 case SIOCSIFDSTADDR: 587 return addrconf_set_dstaddr(net, argp); 588 default: 589 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 590 prot = READ_ONCE(sk->sk_prot); 591 if (!prot->ioctl) 592 return -ENOIOCTLCMD; 593 return prot->ioctl(sk, cmd, arg); 594 } 595 /*NOTREACHED*/ 596 return 0; 597} 598EXPORT_SYMBOL(inet6_ioctl); 599 600#ifdef CONFIG_COMPAT 601struct compat_in6_rtmsg { 602 struct in6_addr rtmsg_dst; 603 struct in6_addr rtmsg_src; 604 struct in6_addr rtmsg_gateway; 605 u32 rtmsg_type; 606 u16 rtmsg_dst_len; 607 u16 rtmsg_src_len; 608 u32 rtmsg_metric; 609 u32 rtmsg_info; 610 u32 rtmsg_flags; 611 s32 rtmsg_ifindex; 612}; 613 614static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 615 struct compat_in6_rtmsg __user *ur) 616{ 617 struct in6_rtmsg rt; 618 619 if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst, 620 3 * sizeof(struct in6_addr)) || 621 get_user(rt.rtmsg_type, &ur->rtmsg_type) || 622 get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) || 623 get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) || 624 get_user(rt.rtmsg_metric, &ur->rtmsg_metric) || 625 get_user(rt.rtmsg_info, &ur->rtmsg_info) || 626 get_user(rt.rtmsg_flags, &ur->rtmsg_flags) || 627 get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex)) 628 return -EFAULT; 629 630 631 return ipv6_route_ioctl(sock_net(sk), cmd, &rt); 632} 633 634int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 635{ 636 void __user *argp = compat_ptr(arg); 637 struct sock *sk = sock->sk; 638 639 switch (cmd) { 640 case SIOCADDRT: 641 case SIOCDELRT: 642 return inet6_compat_routing_ioctl(sk, cmd, argp); 643 default: 644 return -ENOIOCTLCMD; 645 } 646} 647EXPORT_SYMBOL_GPL(inet6_compat_ioctl); 648#endif /* CONFIG_COMPAT */ 649 650INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *, 651 size_t)); 652int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 653{ 654 struct sock *sk = sock->sk; 655 const struct proto *prot; 656 657 if (unlikely(inet_send_prepare(sk))) 658 return -EAGAIN; 659 660 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 661 prot = READ_ONCE(sk->sk_prot); 662 return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg, 663 sk, msg, size); 664} 665 666INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *, 667 size_t, int, int, int *)); 668int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 669 int flags) 670{ 671 struct sock *sk = sock->sk; 672 const struct proto *prot; 673 int addr_len = 0; 674 int err; 675 676 if (likely(!(flags & MSG_ERRQUEUE))) 677 sock_rps_record_flow(sk); 678 679 /* IPV6_ADDRFORM can change sk->sk_prot under us. */ 680 prot = READ_ONCE(sk->sk_prot); 681 err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg, 682 sk, msg, size, flags & MSG_DONTWAIT, 683 flags & ~MSG_DONTWAIT, &addr_len); 684 if (err >= 0) 685 msg->msg_namelen = addr_len; 686 return err; 687} 688 689const struct proto_ops inet6_stream_ops = { 690 .family = PF_INET6, 691 .owner = THIS_MODULE, 692 .release = inet6_release, 693 .bind = inet6_bind, 694 .connect = inet_stream_connect, /* ok */ 695 .socketpair = sock_no_socketpair, /* a do nothing */ 696 .accept = inet_accept, /* ok */ 697 .getname = inet6_getname, 698 .poll = tcp_poll, /* ok */ 699 .ioctl = inet6_ioctl, /* must change */ 700 .gettstamp = sock_gettstamp, 701 .listen = inet_listen, /* ok */ 702 .shutdown = inet_shutdown, /* ok */ 703 .setsockopt = sock_common_setsockopt, /* ok */ 704 .getsockopt = sock_common_getsockopt, /* ok */ 705 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 706 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 707#ifdef CONFIG_MMU 708 .mmap = tcp_mmap, 709#endif 710 .sendpage = inet_sendpage, 711 .sendmsg_locked = tcp_sendmsg_locked, 712 .sendpage_locked = tcp_sendpage_locked, 713 .splice_read = tcp_splice_read, 714 .read_sock = tcp_read_sock, 715 .peek_len = tcp_peek_len, 716#ifdef CONFIG_COMPAT 717 .compat_ioctl = inet6_compat_ioctl, 718#endif 719 .set_rcvlowat = tcp_set_rcvlowat, 720}; 721 722const struct proto_ops inet6_dgram_ops = { 723 .family = PF_INET6, 724 .owner = THIS_MODULE, 725 .release = inet6_release, 726 .bind = inet6_bind, 727 .connect = inet_dgram_connect, /* ok */ 728 .socketpair = sock_no_socketpair, /* a do nothing */ 729 .accept = sock_no_accept, /* a do nothing */ 730 .getname = inet6_getname, 731 .poll = udp_poll, /* ok */ 732 .ioctl = inet6_ioctl, /* must change */ 733 .gettstamp = sock_gettstamp, 734 .listen = sock_no_listen, /* ok */ 735 .shutdown = inet_shutdown, /* ok */ 736 .setsockopt = sock_common_setsockopt, /* ok */ 737 .getsockopt = sock_common_getsockopt, /* ok */ 738 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 739 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 740 .mmap = sock_no_mmap, 741 .sendpage = sock_no_sendpage, 742 .set_peek_off = sk_set_peek_off, 743#ifdef CONFIG_COMPAT 744 .compat_ioctl = inet6_compat_ioctl, 745#endif 746}; 747 748static const struct net_proto_family inet6_family_ops = { 749 .family = PF_INET6, 750 .create = inet6_create, 751 .owner = THIS_MODULE, 752}; 753 754int inet6_register_protosw(struct inet_protosw *p) 755{ 756 struct list_head *lh; 757 struct inet_protosw *answer; 758 struct list_head *last_perm; 759 int protocol = p->protocol; 760 int ret; 761 762 spin_lock_bh(&inetsw6_lock); 763 764 ret = -EINVAL; 765 if (p->type >= SOCK_MAX) 766 goto out_illegal; 767 768 /* If we are trying to override a permanent protocol, bail. */ 769 answer = NULL; 770 ret = -EPERM; 771 last_perm = &inetsw6[p->type]; 772 list_for_each(lh, &inetsw6[p->type]) { 773 answer = list_entry(lh, struct inet_protosw, list); 774 775 /* Check only the non-wild match. */ 776 if (INET_PROTOSW_PERMANENT & answer->flags) { 777 if (protocol == answer->protocol) 778 break; 779 last_perm = lh; 780 } 781 782 answer = NULL; 783 } 784 if (answer) 785 goto out_permanent; 786 787 /* Add the new entry after the last permanent entry if any, so that 788 * the new entry does not override a permanent entry when matched with 789 * a wild-card protocol. But it is allowed to override any existing 790 * non-permanent entry. This means that when we remove this entry, the 791 * system automatically returns to the old behavior. 792 */ 793 list_add_rcu(&p->list, last_perm); 794 ret = 0; 795out: 796 spin_unlock_bh(&inetsw6_lock); 797 return ret; 798 799out_permanent: 800 pr_err("Attempt to override permanent protocol %d\n", protocol); 801 goto out; 802 803out_illegal: 804 pr_err("Ignoring attempt to register invalid socket type %d\n", 805 p->type); 806 goto out; 807} 808EXPORT_SYMBOL(inet6_register_protosw); 809 810void 811inet6_unregister_protosw(struct inet_protosw *p) 812{ 813 if (INET_PROTOSW_PERMANENT & p->flags) { 814 pr_err("Attempt to unregister permanent protocol %d\n", 815 p->protocol); 816 } else { 817 spin_lock_bh(&inetsw6_lock); 818 list_del_rcu(&p->list); 819 spin_unlock_bh(&inetsw6_lock); 820 821 synchronize_net(); 822 } 823} 824EXPORT_SYMBOL(inet6_unregister_protosw); 825 826int inet6_sk_rebuild_header(struct sock *sk) 827{ 828 struct ipv6_pinfo *np = inet6_sk(sk); 829 struct dst_entry *dst; 830 831 dst = __sk_dst_check(sk, np->dst_cookie); 832 833 if (!dst) { 834 struct inet_sock *inet = inet_sk(sk); 835 struct in6_addr *final_p, final; 836 struct flowi6 fl6; 837 838 memset(&fl6, 0, sizeof(fl6)); 839 fl6.flowi6_proto = sk->sk_protocol; 840 fl6.daddr = sk->sk_v6_daddr; 841 fl6.saddr = np->saddr; 842 fl6.flowlabel = np->flow_label; 843 fl6.flowi6_oif = sk->sk_bound_dev_if; 844 fl6.flowi6_mark = sk->sk_mark; 845 fl6.fl6_dport = inet->inet_dport; 846 fl6.fl6_sport = inet->inet_sport; 847 fl6.flowi6_uid = sk->sk_uid; 848 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); 849 850 rcu_read_lock(); 851 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 852 &final); 853 rcu_read_unlock(); 854 855 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); 856 if (IS_ERR(dst)) { 857 sk->sk_route_caps = 0; 858 sk->sk_err_soft = -PTR_ERR(dst); 859 return PTR_ERR(dst); 860 } 861 862 ip6_dst_store(sk, dst, NULL, NULL); 863 } 864 865 return 0; 866} 867EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 868 869bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 870 const struct inet6_skb_parm *opt) 871{ 872 const struct ipv6_pinfo *np = inet6_sk(sk); 873 874 if (np->rxopt.all) { 875 if (((opt->flags & IP6SKB_HOPBYHOP) && 876 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 877 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 878 np->rxopt.bits.rxflow) || 879 (opt->srcrt && (np->rxopt.bits.srcrt || 880 np->rxopt.bits.osrcrt)) || 881 ((opt->dst1 || opt->dst0) && 882 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 883 return true; 884 } 885 return false; 886} 887EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 888 889static struct packet_type ipv6_packet_type __read_mostly = { 890 .type = cpu_to_be16(ETH_P_IPV6), 891 .func = ipv6_rcv, 892 .list_func = ipv6_list_rcv, 893}; 894 895static int __init ipv6_packet_init(void) 896{ 897 dev_add_pack(&ipv6_packet_type); 898 return 0; 899} 900 901static void ipv6_packet_cleanup(void) 902{ 903 dev_remove_pack(&ipv6_packet_type); 904} 905 906static int __net_init ipv6_init_mibs(struct net *net) 907{ 908 int i; 909 910 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 911 if (!net->mib.udp_stats_in6) 912 return -ENOMEM; 913 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 914 if (!net->mib.udplite_stats_in6) 915 goto err_udplite_mib; 916 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 917 if (!net->mib.ipv6_statistics) 918 goto err_ip_mib; 919 920 for_each_possible_cpu(i) { 921 struct ipstats_mib *af_inet6_stats; 922 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 923 u64_stats_init(&af_inet6_stats->syncp); 924 } 925 926 927 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 928 if (!net->mib.icmpv6_statistics) 929 goto err_icmp_mib; 930 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 931 GFP_KERNEL); 932 if (!net->mib.icmpv6msg_statistics) 933 goto err_icmpmsg_mib; 934 return 0; 935 936err_icmpmsg_mib: 937 free_percpu(net->mib.icmpv6_statistics); 938err_icmp_mib: 939 free_percpu(net->mib.ipv6_statistics); 940err_ip_mib: 941 free_percpu(net->mib.udplite_stats_in6); 942err_udplite_mib: 943 free_percpu(net->mib.udp_stats_in6); 944 return -ENOMEM; 945} 946 947static void ipv6_cleanup_mibs(struct net *net) 948{ 949 free_percpu(net->mib.udp_stats_in6); 950 free_percpu(net->mib.udplite_stats_in6); 951 free_percpu(net->mib.ipv6_statistics); 952 free_percpu(net->mib.icmpv6_statistics); 953 kfree(net->mib.icmpv6msg_statistics); 954} 955 956static int __net_init inet6_net_init(struct net *net) 957{ 958 int err = 0; 959 960 net->ipv6.sysctl.bindv6only = 0; 961 net->ipv6.sysctl.icmpv6_time = 1*HZ; 962 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0; 963 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0; 964 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0; 965 966 /* By default, rate limit error messages. 967 * Except for pmtu discovery, it would break it. 968 * proc_do_large_bitmap needs pointer to the bitmap. 969 */ 970 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1); 971 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1); 972 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask; 973 974 net->ipv6.sysctl.flowlabel_consistency = 1; 975 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 976 net->ipv6.sysctl.idgen_retries = 3; 977 net->ipv6.sysctl.idgen_delay = 1 * HZ; 978 net->ipv6.sysctl.flowlabel_state_ranges = 0; 979 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 980 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 981 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 982 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 983 atomic_set(&net->ipv6.fib6_sernum, 1); 984 985 err = ipv6_init_mibs(net); 986 if (err) 987 return err; 988#ifdef CONFIG_PROC_FS 989 err = udp6_proc_init(net); 990 if (err) 991 goto out; 992 err = tcp6_proc_init(net); 993 if (err) 994 goto proc_tcp6_fail; 995 err = ac6_proc_init(net); 996 if (err) 997 goto proc_ac6_fail; 998#endif 999 return err; 1000 1001#ifdef CONFIG_PROC_FS 1002proc_ac6_fail: 1003 tcp6_proc_exit(net); 1004proc_tcp6_fail: 1005 udp6_proc_exit(net); 1006out: 1007 ipv6_cleanup_mibs(net); 1008 return err; 1009#endif 1010} 1011 1012static void __net_exit inet6_net_exit(struct net *net) 1013{ 1014#ifdef CONFIG_PROC_FS 1015 udp6_proc_exit(net); 1016 tcp6_proc_exit(net); 1017 ac6_proc_exit(net); 1018#endif 1019 ipv6_cleanup_mibs(net); 1020} 1021 1022static struct pernet_operations inet6_net_ops = { 1023 .init = inet6_net_init, 1024 .exit = inet6_net_exit, 1025}; 1026 1027static int ipv6_route_input(struct sk_buff *skb) 1028{ 1029 ip6_route_input(skb); 1030 return skb_dst(skb)->error; 1031} 1032 1033static const struct ipv6_stub ipv6_stub_impl = { 1034 .ipv6_sock_mc_join = ipv6_sock_mc_join, 1035 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 1036 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow, 1037 .ipv6_route_input = ipv6_route_input, 1038 .fib6_get_table = fib6_get_table, 1039 .fib6_table_lookup = fib6_table_lookup, 1040 .fib6_lookup = fib6_lookup, 1041 .fib6_select_path = fib6_select_path, 1042 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6, 1043 .fib6_nh_init = fib6_nh_init, 1044 .fib6_nh_release = fib6_nh_release, 1045 .fib6_nh_release_dsts = fib6_nh_release_dsts, 1046 .fib6_update_sernum = fib6_update_sernum_stub, 1047 .fib6_rt_update = fib6_rt_update, 1048 .ip6_del_rt = ip6_del_rt, 1049 .udpv6_encap_enable = udpv6_encap_enable, 1050 .ndisc_send_na = ndisc_send_na, 1051#if IS_ENABLED(CONFIG_XFRM) 1052 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu, 1053 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv, 1054 .xfrm6_rcv_encap = xfrm6_rcv_encap, 1055#endif 1056 .nd_tbl = &nd_tbl, 1057 .ipv6_fragment = ip6_fragment, 1058}; 1059 1060static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = { 1061 .inet6_bind = __inet6_bind, 1062 .udp6_lib_lookup = __udp6_lib_lookup, 1063}; 1064 1065static int __init inet6_init(void) 1066{ 1067 struct list_head *r; 1068 int err = 0; 1069 1070 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 1071 1072 /* Register the socket-side information for inet6_create. */ 1073 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 1074 INIT_LIST_HEAD(r); 1075 1076 if (disable_ipv6_mod) { 1077 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 1078 goto out; 1079 } 1080 1081 err = proto_register(&tcpv6_prot, 1); 1082 if (err) 1083 goto out; 1084 1085 err = proto_register(&udpv6_prot, 1); 1086 if (err) 1087 goto out_unregister_tcp_proto; 1088 1089 err = proto_register(&udplitev6_prot, 1); 1090 if (err) 1091 goto out_unregister_udp_proto; 1092 1093 err = proto_register(&rawv6_prot, 1); 1094 if (err) 1095 goto out_unregister_udplite_proto; 1096 1097 err = proto_register(&pingv6_prot, 1); 1098 if (err) 1099 goto out_unregister_raw_proto; 1100 1101 /* We MUST register RAW sockets before we create the ICMP6, 1102 * IGMP6, or NDISC control sockets. 1103 */ 1104 err = rawv6_init(); 1105 if (err) 1106 goto out_unregister_ping_proto; 1107 1108 /* Register the family here so that the init calls below will 1109 * be able to create sockets. (?? is this dangerous ??) 1110 */ 1111 err = sock_register(&inet6_family_ops); 1112 if (err) 1113 goto out_sock_register_fail; 1114 1115 /* 1116 * ipngwg API draft makes clear that the correct semantics 1117 * for TCP and UDP is to consider one TCP and UDP instance 1118 * in a host available by both INET and INET6 APIs and 1119 * able to communicate via both network protocols. 1120 */ 1121 1122 err = register_pernet_subsys(&inet6_net_ops); 1123 if (err) 1124 goto register_pernet_fail; 1125 err = ip6_mr_init(); 1126 if (err) 1127 goto ipmr_fail; 1128 err = icmpv6_init(); 1129 if (err) 1130 goto icmp_fail; 1131 err = ndisc_init(); 1132 if (err) 1133 goto ndisc_fail; 1134 err = igmp6_init(); 1135 if (err) 1136 goto igmp_fail; 1137 1138 err = ipv6_netfilter_init(); 1139 if (err) 1140 goto netfilter_fail; 1141 /* Create /proc/foo6 entries. */ 1142#ifdef CONFIG_PROC_FS 1143 err = -ENOMEM; 1144 if (raw6_proc_init()) 1145 goto proc_raw6_fail; 1146 if (udplite6_proc_init()) 1147 goto proc_udplite6_fail; 1148 if (ipv6_misc_proc_init()) 1149 goto proc_misc6_fail; 1150 if (if6_proc_init()) 1151 goto proc_if6_fail; 1152#endif 1153 err = ip6_route_init(); 1154 if (err) 1155 goto ip6_route_fail; 1156 err = ndisc_late_init(); 1157 if (err) 1158 goto ndisc_late_fail; 1159 err = ip6_flowlabel_init(); 1160 if (err) 1161 goto ip6_flowlabel_fail; 1162 err = ipv6_anycast_init(); 1163 if (err) 1164 goto ipv6_anycast_fail; 1165 err = addrconf_init(); 1166 if (err) 1167 goto addrconf_fail; 1168 1169 /* Init v6 extension headers. */ 1170 err = ipv6_exthdrs_init(); 1171 if (err) 1172 goto ipv6_exthdrs_fail; 1173 1174 err = ipv6_frag_init(); 1175 if (err) 1176 goto ipv6_frag_fail; 1177 1178 /* Init v6 transport protocols. */ 1179 err = udpv6_init(); 1180 if (err) 1181 goto udpv6_fail; 1182 1183 err = udplitev6_init(); 1184 if (err) 1185 goto udplitev6_fail; 1186 1187 err = udpv6_offload_init(); 1188 if (err) 1189 goto udpv6_offload_fail; 1190 1191 err = tcpv6_init(); 1192 if (err) 1193 goto tcpv6_fail; 1194 1195 err = ipv6_packet_init(); 1196 if (err) 1197 goto ipv6_packet_fail; 1198 1199 err = pingv6_init(); 1200 if (err) 1201 goto pingv6_fail; 1202 1203 err = calipso_init(); 1204 if (err) 1205 goto calipso_fail; 1206 1207 err = seg6_init(); 1208 if (err) 1209 goto seg6_fail; 1210 1211 err = rpl_init(); 1212 if (err) 1213 goto rpl_fail; 1214 1215 err = igmp6_late_init(); 1216 if (err) 1217 goto igmp6_late_err; 1218 1219#ifdef CONFIG_SYSCTL 1220 err = ipv6_sysctl_register(); 1221 if (err) 1222 goto sysctl_fail; 1223#endif 1224 1225 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1226 wmb(); 1227 ipv6_stub = &ipv6_stub_impl; 1228 ipv6_bpf_stub = &ipv6_bpf_stub_impl; 1229out: 1230 return err; 1231 1232#ifdef CONFIG_SYSCTL 1233sysctl_fail: 1234 igmp6_late_cleanup(); 1235#endif 1236igmp6_late_err: 1237 rpl_exit(); 1238rpl_fail: 1239 seg6_exit(); 1240seg6_fail: 1241 calipso_exit(); 1242calipso_fail: 1243 pingv6_exit(); 1244pingv6_fail: 1245 ipv6_packet_cleanup(); 1246ipv6_packet_fail: 1247 tcpv6_exit(); 1248tcpv6_fail: 1249 udpv6_offload_exit(); 1250udpv6_offload_fail: 1251 udplitev6_exit(); 1252udplitev6_fail: 1253 udpv6_exit(); 1254udpv6_fail: 1255 ipv6_frag_exit(); 1256ipv6_frag_fail: 1257 ipv6_exthdrs_exit(); 1258ipv6_exthdrs_fail: 1259 addrconf_cleanup(); 1260addrconf_fail: 1261 ipv6_anycast_cleanup(); 1262ipv6_anycast_fail: 1263 ip6_flowlabel_cleanup(); 1264ip6_flowlabel_fail: 1265 ndisc_late_cleanup(); 1266ndisc_late_fail: 1267 ip6_route_cleanup(); 1268ip6_route_fail: 1269#ifdef CONFIG_PROC_FS 1270 if6_proc_exit(); 1271proc_if6_fail: 1272 ipv6_misc_proc_exit(); 1273proc_misc6_fail: 1274 udplite6_proc_exit(); 1275proc_udplite6_fail: 1276 raw6_proc_exit(); 1277proc_raw6_fail: 1278#endif 1279 ipv6_netfilter_fini(); 1280netfilter_fail: 1281 igmp6_cleanup(); 1282igmp_fail: 1283 ndisc_cleanup(); 1284ndisc_fail: 1285 icmpv6_cleanup(); 1286icmp_fail: 1287 ip6_mr_cleanup(); 1288ipmr_fail: 1289 unregister_pernet_subsys(&inet6_net_ops); 1290register_pernet_fail: 1291 sock_unregister(PF_INET6); 1292 rtnl_unregister_all(PF_INET6); 1293out_sock_register_fail: 1294 rawv6_exit(); 1295out_unregister_ping_proto: 1296 proto_unregister(&pingv6_prot); 1297out_unregister_raw_proto: 1298 proto_unregister(&rawv6_prot); 1299out_unregister_udplite_proto: 1300 proto_unregister(&udplitev6_prot); 1301out_unregister_udp_proto: 1302 proto_unregister(&udpv6_prot); 1303out_unregister_tcp_proto: 1304 proto_unregister(&tcpv6_prot); 1305 goto out; 1306} 1307module_init(inet6_init); 1308 1309MODULE_ALIAS_NETPROTO(PF_INET6); 1310