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 71 MODULE_AUTHOR("Cast of dozens"); 72 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 73 MODULE_LICENSE("GPL"); 74 75 /* The inetsw6 table contains everything that inet6_create needs to 76 * build a new socket. 77 */ 78 static struct list_head inetsw6[SOCK_MAX]; 79 static DEFINE_SPINLOCK(inetsw6_lock); 80 81 struct ipv6_params ipv6_defaults = { 82 .disable_ipv6 = 0, 83 .autoconf = 1, 84 }; 85 86 static int disable_ipv6_mod; 87 88 module_param_named(disable, disable_ipv6_mod, int, 0444); 89 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 90 91 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 92 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 93 94 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 95 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 96 97 bool ipv6_mod_enabled(void) 98 { 99 return disable_ipv6_mod == 0; 100 } 101 EXPORT_SYMBOL_GPL(ipv6_mod_enabled); 102 103 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 104 { 105 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 106 107 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 108 } 109 110 static int inet6_create(struct net *net, struct socket *sock, int protocol, 111 int kern) 112 { 113 struct inet_sock *inet; 114 struct ipv6_pinfo *np; 115 struct sock *sk; 116 struct inet_protosw *answer; 117 struct proto *answer_prot; 118 unsigned char answer_flags; 119 int try_loading_module = 0; 120 int err; 121 122 if (protocol < 0 || protocol >= IPPROTO_MAX) 123 return -EINVAL; 124 125 /* Look for the requested type/protocol pair. */ 126 lookup_protocol: 127 err = -ESOCKTNOSUPPORT; 128 rcu_read_lock(); 129 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 130 131 err = 0; 132 /* Check the non-wild match. */ 133 if (protocol == answer->protocol) { 134 if (protocol != IPPROTO_IP) 135 break; 136 } else { 137 /* Check for the two wild cases. */ 138 if (IPPROTO_IP == protocol) { 139 protocol = answer->protocol; 140 break; 141 } 142 if (IPPROTO_IP == answer->protocol) 143 break; 144 } 145 err = -EPROTONOSUPPORT; 146 } 147 148 if (err) { 149 if (try_loading_module < 2) { 150 rcu_read_unlock(); 151 /* 152 * Be more specific, e.g. net-pf-10-proto-132-type-1 153 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 154 */ 155 if (++try_loading_module == 1) 156 request_module("net-pf-%d-proto-%d-type-%d", 157 PF_INET6, protocol, sock->type); 158 /* 159 * Fall back to generic, e.g. net-pf-10-proto-132 160 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 161 */ 162 else 163 request_module("net-pf-%d-proto-%d", 164 PF_INET6, protocol); 165 goto lookup_protocol; 166 } else 167 goto out_rcu_unlock; 168 } 169 170 err = -EPERM; 171 if (sock->type == SOCK_RAW && !kern && 172 !ns_capable(net->user_ns, CAP_NET_RAW)) 173 goto out_rcu_unlock; 174 175 sock->ops = answer->ops; 176 answer_prot = answer->prot; 177 answer_flags = answer->flags; 178 rcu_read_unlock(); 179 180 WARN_ON(!answer_prot->slab); 181 182 err = -ENOBUFS; 183 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 184 if (!sk) 185 goto out; 186 187 sock_init_data(sock, sk); 188 189 err = 0; 190 if (INET_PROTOSW_REUSE & answer_flags) 191 sk->sk_reuse = SK_CAN_REUSE; 192 193 inet = inet_sk(sk); 194 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 195 196 if (SOCK_RAW == sock->type) { 197 inet->inet_num = protocol; 198 if (IPPROTO_RAW == protocol) 199 inet->hdrincl = 1; 200 } 201 202 sk->sk_destruct = inet_sock_destruct; 203 sk->sk_family = PF_INET6; 204 sk->sk_protocol = protocol; 205 206 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 207 208 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 209 np->hop_limit = -1; 210 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 211 np->mc_loop = 1; 212 np->mc_all = 1; 213 np->pmtudisc = IPV6_PMTUDISC_WANT; 214 np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED; 215 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 216 217 /* Init the ipv4 part of the socket since we can have sockets 218 * using v6 API for ipv4. 219 */ 220 inet->uc_ttl = -1; 221 222 inet->mc_loop = 1; 223 inet->mc_ttl = 1; 224 inet->mc_index = 0; 225 inet->mc_list = NULL; 226 inet->rcv_tos = 0; 227 228 if (net->ipv4.sysctl_ip_no_pmtu_disc) 229 inet->pmtudisc = IP_PMTUDISC_DONT; 230 else 231 inet->pmtudisc = IP_PMTUDISC_WANT; 232 /* 233 * Increment only the relevant sk_prot->socks debug field, this changes 234 * the previous behaviour of incrementing both the equivalent to 235 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 236 * 237 * This allows better debug granularity as we'll know exactly how many 238 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 239 * transport protocol socks. -acme 240 */ 241 sk_refcnt_debug_inc(sk); 242 243 if (inet->inet_num) { 244 /* It assumes that any protocol which allows 245 * the user to assign a number at socket 246 * creation time automatically shares. 247 */ 248 inet->inet_sport = htons(inet->inet_num); 249 err = sk->sk_prot->hash(sk); 250 if (err) { 251 sk_common_release(sk); 252 goto out; 253 } 254 } 255 if (sk->sk_prot->init) { 256 err = sk->sk_prot->init(sk); 257 if (err) { 258 sk_common_release(sk); 259 goto out; 260 } 261 } 262 263 if (!kern) { 264 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 265 if (err) { 266 sk_common_release(sk); 267 goto out; 268 } 269 } 270 out: 271 return err; 272 out_rcu_unlock: 273 rcu_read_unlock(); 274 goto out; 275 } 276 277 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 278 u32 flags) 279 { 280 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 281 struct inet_sock *inet = inet_sk(sk); 282 struct ipv6_pinfo *np = inet6_sk(sk); 283 struct net *net = sock_net(sk); 284 __be32 v4addr = 0; 285 unsigned short snum; 286 bool saved_ipv6only; 287 int addr_type = 0; 288 int err = 0; 289 290 if (addr->sin6_family != AF_INET6) 291 return -EAFNOSUPPORT; 292 293 addr_type = ipv6_addr_type(&addr->sin6_addr); 294 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM) 295 return -EINVAL; 296 297 snum = ntohs(addr->sin6_port); 298 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) && 299 snum && inet_port_requires_bind_service(net, snum) && 300 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 301 return -EACCES; 302 303 if (flags & BIND_WITH_LOCK) 304 lock_sock(sk); 305 306 /* Check these errors (active socket, double bind). */ 307 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 308 err = -EINVAL; 309 goto out; 310 } 311 312 /* Check if the address belongs to the host. */ 313 if (addr_type == IPV6_ADDR_MAPPED) { 314 struct net_device *dev = NULL; 315 int chk_addr_ret; 316 317 /* Binding to v4-mapped address on a v6-only socket 318 * makes no sense 319 */ 320 if (sk->sk_ipv6only) { 321 err = -EINVAL; 322 goto out; 323 } 324 325 rcu_read_lock(); 326 if (sk->sk_bound_dev_if) { 327 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 328 if (!dev) { 329 err = -ENODEV; 330 goto out_unlock; 331 } 332 } 333 334 /* Reproduce AF_INET checks to make the bindings consistent */ 335 v4addr = addr->sin6_addr.s6_addr32[3]; 336 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr); 337 rcu_read_unlock(); 338 339 if (!inet_can_nonlocal_bind(net, inet) && 340 v4addr != htonl(INADDR_ANY) && 341 chk_addr_ret != RTN_LOCAL && 342 chk_addr_ret != RTN_MULTICAST && 343 chk_addr_ret != RTN_BROADCAST) { 344 err = -EADDRNOTAVAIL; 345 goto out; 346 } 347 } else { 348 if (addr_type != IPV6_ADDR_ANY) { 349 struct net_device *dev = NULL; 350 351 rcu_read_lock(); 352 if (__ipv6_addr_needs_scope_id(addr_type)) { 353 if (addr_len >= sizeof(struct sockaddr_in6) && 354 addr->sin6_scope_id) { 355 /* Override any existing binding, if another one 356 * is supplied by user. 357 */ 358 sk->sk_bound_dev_if = addr->sin6_scope_id; 359 } 360 361 /* Binding to link-local address requires an interface */ 362 if (!sk->sk_bound_dev_if) { 363 err = -EINVAL; 364 goto out_unlock; 365 } 366 } 367 368 if (sk->sk_bound_dev_if) { 369 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 370 if (!dev) { 371 err = -ENODEV; 372 goto out_unlock; 373 } 374 } 375 376 /* ipv4 addr of the socket is invalid. Only the 377 * unspecified and mapped address have a v4 equivalent. 378 */ 379 v4addr = LOOPBACK4_IPV6; 380 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 381 if (!ipv6_can_nonlocal_bind(net, inet) && 382 !ipv6_chk_addr(net, &addr->sin6_addr, 383 dev, 0)) { 384 err = -EADDRNOTAVAIL; 385 goto out_unlock; 386 } 387 } 388 rcu_read_unlock(); 389 } 390 } 391 392 inet->inet_rcv_saddr = v4addr; 393 inet->inet_saddr = v4addr; 394 395 sk->sk_v6_rcv_saddr = addr->sin6_addr; 396 397 if (!(addr_type & IPV6_ADDR_MULTICAST)) 398 np->saddr = addr->sin6_addr; 399 400 saved_ipv6only = sk->sk_ipv6only; 401 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED) 402 sk->sk_ipv6only = 1; 403 404 /* Make sure we are allowed to bind here. */ 405 if (snum || !(inet->bind_address_no_port || 406 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 407 if (sk->sk_prot->get_port(sk, snum)) { 408 sk->sk_ipv6only = saved_ipv6only; 409 inet_reset_saddr(sk); 410 err = -EADDRINUSE; 411 goto out; 412 } 413 if (!(flags & BIND_FROM_BPF)) { 414 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk); 415 if (err) { 416 sk->sk_ipv6only = saved_ipv6only; 417 inet_reset_saddr(sk); 418 goto out; 419 } 420 } 421 } 422 423 if (addr_type != IPV6_ADDR_ANY) 424 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 425 if (snum) 426 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 427 inet->inet_sport = htons(inet->inet_num); 428 inet->inet_dport = 0; 429 inet->inet_daddr = 0; 430 out: 431 if (flags & BIND_WITH_LOCK) 432 release_sock(sk); 433 return err; 434 out_unlock: 435 rcu_read_unlock(); 436 goto out; 437 } 438 439 /* bind for INET6 API */ 440 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 441 { 442 struct sock *sk = sock->sk; 443 u32 flags = BIND_WITH_LOCK; 444 int err = 0; 445 446 /* If the socket has its own bind function then use it. */ 447 if (sk->sk_prot->bind) 448 return sk->sk_prot->bind(sk, uaddr, addr_len); 449 450 if (addr_len < SIN6_LEN_RFC2133) 451 return -EINVAL; 452 453 /* BPF prog is run before any checks are done so that if the prog 454 * changes context in a wrong way it will be caught. 455 */ 456 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, 457 BPF_CGROUP_INET6_BIND, &flags); 458 if (err) 459 return err; 460 461 return __inet6_bind(sk, uaddr, addr_len, flags); 462 } 463 EXPORT_SYMBOL(inet6_bind); 464 465 int inet6_release(struct socket *sock) 466 { 467 struct sock *sk = sock->sk; 468 469 if (!sk) 470 return -EINVAL; 471 472 /* Free mc lists */ 473 ipv6_sock_mc_close(sk); 474 475 /* Free ac lists */ 476 ipv6_sock_ac_close(sk); 477 478 return inet_release(sock); 479 } 480 EXPORT_SYMBOL(inet6_release); 481 482 void inet6_destroy_sock(struct sock *sk) 483 { 484 struct ipv6_pinfo *np = inet6_sk(sk); 485 struct sk_buff *skb; 486 struct ipv6_txoptions *opt; 487 488 /* Release rx options */ 489 490 skb = xchg(&np->pktoptions, NULL); 491 kfree_skb(skb); 492 493 skb = xchg(&np->rxpmtu, NULL); 494 kfree_skb(skb); 495 496 /* Free flowlabels */ 497 fl6_free_socklist(sk); 498 499 /* Free tx options */ 500 501 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 502 if (opt) { 503 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 504 txopt_put(opt); 505 } 506 } 507 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 508 509 /* 510 * This does both peername and sockname. 511 */ 512 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 513 int peer) 514 { 515 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 516 struct sock *sk = sock->sk; 517 struct inet_sock *inet = inet_sk(sk); 518 struct ipv6_pinfo *np = inet6_sk(sk); 519 520 sin->sin6_family = AF_INET6; 521 sin->sin6_flowinfo = 0; 522 sin->sin6_scope_id = 0; 523 if (peer) { 524 if (!inet->inet_dport) 525 return -ENOTCONN; 526 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 527 peer == 1) 528 return -ENOTCONN; 529 sin->sin6_port = inet->inet_dport; 530 sin->sin6_addr = sk->sk_v6_daddr; 531 if (np->sndflow) 532 sin->sin6_flowinfo = np->flow_label; 533 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin, 534 BPF_CGROUP_INET6_GETPEERNAME, 535 NULL); 536 } else { 537 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 538 sin->sin6_addr = np->saddr; 539 else 540 sin->sin6_addr = sk->sk_v6_rcv_saddr; 541 sin->sin6_port = inet->inet_sport; 542 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin, 543 BPF_CGROUP_INET6_GETSOCKNAME, 544 NULL); 545 } 546 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 547 sk->sk_bound_dev_if); 548 return sizeof(*sin); 549 } 550 EXPORT_SYMBOL(inet6_getname); 551 552 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 553 { 554 void __user *argp = (void __user *)arg; 555 struct sock *sk = sock->sk; 556 struct net *net = sock_net(sk); 557 558 switch (cmd) { 559 case SIOCADDRT: 560 case SIOCDELRT: { 561 struct in6_rtmsg rtmsg; 562 563 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg))) 564 return -EFAULT; 565 return ipv6_route_ioctl(net, cmd, &rtmsg); 566 } 567 case SIOCSIFADDR: 568 return addrconf_add_ifaddr(net, argp); 569 case SIOCDIFADDR: 570 return addrconf_del_ifaddr(net, argp); 571 case SIOCSIFDSTADDR: 572 return addrconf_set_dstaddr(net, argp); 573 default: 574 if (!sk->sk_prot->ioctl) 575 return -ENOIOCTLCMD; 576 return sk->sk_prot->ioctl(sk, cmd, arg); 577 } 578 /*NOTREACHED*/ 579 return 0; 580 } 581 EXPORT_SYMBOL(inet6_ioctl); 582 583 #ifdef CONFIG_COMPAT 584 struct compat_in6_rtmsg { 585 struct in6_addr rtmsg_dst; 586 struct in6_addr rtmsg_src; 587 struct in6_addr rtmsg_gateway; 588 u32 rtmsg_type; 589 u16 rtmsg_dst_len; 590 u16 rtmsg_src_len; 591 u32 rtmsg_metric; 592 u32 rtmsg_info; 593 u32 rtmsg_flags; 594 s32 rtmsg_ifindex; 595 }; 596 597 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 598 struct compat_in6_rtmsg __user *ur) 599 { 600 struct in6_rtmsg rt; 601 602 if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst, 603 3 * sizeof(struct in6_addr)) || 604 get_user(rt.rtmsg_type, &ur->rtmsg_type) || 605 get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) || 606 get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) || 607 get_user(rt.rtmsg_metric, &ur->rtmsg_metric) || 608 get_user(rt.rtmsg_info, &ur->rtmsg_info) || 609 get_user(rt.rtmsg_flags, &ur->rtmsg_flags) || 610 get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex)) 611 return -EFAULT; 612 613 614 return ipv6_route_ioctl(sock_net(sk), cmd, &rt); 615 } 616 617 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 618 { 619 void __user *argp = compat_ptr(arg); 620 struct sock *sk = sock->sk; 621 622 switch (cmd) { 623 case SIOCADDRT: 624 case SIOCDELRT: 625 return inet6_compat_routing_ioctl(sk, cmd, argp); 626 default: 627 return -ENOIOCTLCMD; 628 } 629 } 630 EXPORT_SYMBOL_GPL(inet6_compat_ioctl); 631 #endif /* CONFIG_COMPAT */ 632 633 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *, 634 size_t)); 635 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 636 { 637 struct sock *sk = sock->sk; 638 639 if (unlikely(inet_send_prepare(sk))) 640 return -EAGAIN; 641 642 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udpv6_sendmsg, 643 sk, msg, size); 644 } 645 646 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *, 647 size_t, int, int, int *)); 648 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 649 int flags) 650 { 651 struct sock *sk = sock->sk; 652 int addr_len = 0; 653 int err; 654 655 if (likely(!(flags & MSG_ERRQUEUE))) 656 sock_rps_record_flow(sk); 657 658 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udpv6_recvmsg, 659 sk, msg, size, flags & MSG_DONTWAIT, 660 flags & ~MSG_DONTWAIT, &addr_len); 661 if (err >= 0) 662 msg->msg_namelen = addr_len; 663 return err; 664 } 665 666 const struct proto_ops inet6_stream_ops = { 667 .family = PF_INET6, 668 .owner = THIS_MODULE, 669 .release = inet6_release, 670 .bind = inet6_bind, 671 .connect = inet_stream_connect, /* ok */ 672 .socketpair = sock_no_socketpair, /* a do nothing */ 673 .accept = inet_accept, /* ok */ 674 .getname = inet6_getname, 675 .poll = tcp_poll, /* ok */ 676 .ioctl = inet6_ioctl, /* must change */ 677 .gettstamp = sock_gettstamp, 678 .listen = inet_listen, /* ok */ 679 .shutdown = inet_shutdown, /* ok */ 680 .setsockopt = sock_common_setsockopt, /* ok */ 681 .getsockopt = sock_common_getsockopt, /* ok */ 682 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 683 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 684 #ifdef CONFIG_MMU 685 .mmap = tcp_mmap, 686 #endif 687 .sendpage = inet_sendpage, 688 .sendmsg_locked = tcp_sendmsg_locked, 689 .sendpage_locked = tcp_sendpage_locked, 690 .splice_read = tcp_splice_read, 691 .read_sock = tcp_read_sock, 692 .peek_len = tcp_peek_len, 693 #ifdef CONFIG_COMPAT 694 .compat_ioctl = inet6_compat_ioctl, 695 #endif 696 .set_rcvlowat = tcp_set_rcvlowat, 697 }; 698 699 const struct proto_ops inet6_dgram_ops = { 700 .family = PF_INET6, 701 .owner = THIS_MODULE, 702 .release = inet6_release, 703 .bind = inet6_bind, 704 .connect = inet_dgram_connect, /* ok */ 705 .socketpair = sock_no_socketpair, /* a do nothing */ 706 .accept = sock_no_accept, /* a do nothing */ 707 .getname = inet6_getname, 708 .poll = udp_poll, /* ok */ 709 .ioctl = inet6_ioctl, /* must change */ 710 .gettstamp = sock_gettstamp, 711 .listen = sock_no_listen, /* ok */ 712 .shutdown = inet_shutdown, /* ok */ 713 .setsockopt = sock_common_setsockopt, /* ok */ 714 .getsockopt = sock_common_getsockopt, /* ok */ 715 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 716 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 717 .mmap = sock_no_mmap, 718 .sendpage = sock_no_sendpage, 719 .set_peek_off = sk_set_peek_off, 720 #ifdef CONFIG_COMPAT 721 .compat_ioctl = inet6_compat_ioctl, 722 #endif 723 }; 724 725 static const struct net_proto_family inet6_family_ops = { 726 .family = PF_INET6, 727 .create = inet6_create, 728 .owner = THIS_MODULE, 729 }; 730 731 int inet6_register_protosw(struct inet_protosw *p) 732 { 733 struct list_head *lh; 734 struct inet_protosw *answer; 735 struct list_head *last_perm; 736 int protocol = p->protocol; 737 int ret; 738 739 spin_lock_bh(&inetsw6_lock); 740 741 ret = -EINVAL; 742 if (p->type >= SOCK_MAX) 743 goto out_illegal; 744 745 /* If we are trying to override a permanent protocol, bail. */ 746 answer = NULL; 747 ret = -EPERM; 748 last_perm = &inetsw6[p->type]; 749 list_for_each(lh, &inetsw6[p->type]) { 750 answer = list_entry(lh, struct inet_protosw, list); 751 752 /* Check only the non-wild match. */ 753 if (INET_PROTOSW_PERMANENT & answer->flags) { 754 if (protocol == answer->protocol) 755 break; 756 last_perm = lh; 757 } 758 759 answer = NULL; 760 } 761 if (answer) 762 goto out_permanent; 763 764 /* Add the new entry after the last permanent entry if any, so that 765 * the new entry does not override a permanent entry when matched with 766 * a wild-card protocol. But it is allowed to override any existing 767 * non-permanent entry. This means that when we remove this entry, the 768 * system automatically returns to the old behavior. 769 */ 770 list_add_rcu(&p->list, last_perm); 771 ret = 0; 772 out: 773 spin_unlock_bh(&inetsw6_lock); 774 return ret; 775 776 out_permanent: 777 pr_err("Attempt to override permanent protocol %d\n", protocol); 778 goto out; 779 780 out_illegal: 781 pr_err("Ignoring attempt to register invalid socket type %d\n", 782 p->type); 783 goto out; 784 } 785 EXPORT_SYMBOL(inet6_register_protosw); 786 787 void 788 inet6_unregister_protosw(struct inet_protosw *p) 789 { 790 if (INET_PROTOSW_PERMANENT & p->flags) { 791 pr_err("Attempt to unregister permanent protocol %d\n", 792 p->protocol); 793 } else { 794 spin_lock_bh(&inetsw6_lock); 795 list_del_rcu(&p->list); 796 spin_unlock_bh(&inetsw6_lock); 797 798 synchronize_net(); 799 } 800 } 801 EXPORT_SYMBOL(inet6_unregister_protosw); 802 803 int inet6_sk_rebuild_header(struct sock *sk) 804 { 805 struct ipv6_pinfo *np = inet6_sk(sk); 806 struct dst_entry *dst; 807 808 dst = __sk_dst_check(sk, np->dst_cookie); 809 810 if (!dst) { 811 struct inet_sock *inet = inet_sk(sk); 812 struct in6_addr *final_p, final; 813 struct flowi6 fl6; 814 815 memset(&fl6, 0, sizeof(fl6)); 816 fl6.flowi6_proto = sk->sk_protocol; 817 fl6.daddr = sk->sk_v6_daddr; 818 fl6.saddr = np->saddr; 819 fl6.flowlabel = np->flow_label; 820 fl6.flowi6_oif = sk->sk_bound_dev_if; 821 fl6.flowi6_mark = sk->sk_mark; 822 fl6.fl6_dport = inet->inet_dport; 823 fl6.fl6_sport = inet->inet_sport; 824 fl6.flowi6_uid = sk->sk_uid; 825 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); 826 827 rcu_read_lock(); 828 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 829 &final); 830 rcu_read_unlock(); 831 832 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); 833 if (IS_ERR(dst)) { 834 sk->sk_route_caps = 0; 835 sk->sk_err_soft = -PTR_ERR(dst); 836 return PTR_ERR(dst); 837 } 838 839 ip6_dst_store(sk, dst, NULL, NULL); 840 } 841 842 return 0; 843 } 844 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 845 846 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 847 const struct inet6_skb_parm *opt) 848 { 849 const struct ipv6_pinfo *np = inet6_sk(sk); 850 851 if (np->rxopt.all) { 852 if (((opt->flags & IP6SKB_HOPBYHOP) && 853 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 854 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 855 np->rxopt.bits.rxflow) || 856 (opt->srcrt && (np->rxopt.bits.srcrt || 857 np->rxopt.bits.osrcrt)) || 858 ((opt->dst1 || opt->dst0) && 859 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 860 return true; 861 } 862 return false; 863 } 864 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 865 866 static struct packet_type ipv6_packet_type __read_mostly = { 867 .type = cpu_to_be16(ETH_P_IPV6), 868 .func = ipv6_rcv, 869 .list_func = ipv6_list_rcv, 870 }; 871 872 static int __init ipv6_packet_init(void) 873 { 874 dev_add_pack(&ipv6_packet_type); 875 return 0; 876 } 877 878 static void ipv6_packet_cleanup(void) 879 { 880 dev_remove_pack(&ipv6_packet_type); 881 } 882 883 static int __net_init ipv6_init_mibs(struct net *net) 884 { 885 int i; 886 887 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 888 if (!net->mib.udp_stats_in6) 889 return -ENOMEM; 890 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 891 if (!net->mib.udplite_stats_in6) 892 goto err_udplite_mib; 893 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 894 if (!net->mib.ipv6_statistics) 895 goto err_ip_mib; 896 897 for_each_possible_cpu(i) { 898 struct ipstats_mib *af_inet6_stats; 899 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 900 u64_stats_init(&af_inet6_stats->syncp); 901 } 902 903 904 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 905 if (!net->mib.icmpv6_statistics) 906 goto err_icmp_mib; 907 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 908 GFP_KERNEL); 909 if (!net->mib.icmpv6msg_statistics) 910 goto err_icmpmsg_mib; 911 return 0; 912 913 err_icmpmsg_mib: 914 free_percpu(net->mib.icmpv6_statistics); 915 err_icmp_mib: 916 free_percpu(net->mib.ipv6_statistics); 917 err_ip_mib: 918 free_percpu(net->mib.udplite_stats_in6); 919 err_udplite_mib: 920 free_percpu(net->mib.udp_stats_in6); 921 return -ENOMEM; 922 } 923 924 static void ipv6_cleanup_mibs(struct net *net) 925 { 926 free_percpu(net->mib.udp_stats_in6); 927 free_percpu(net->mib.udplite_stats_in6); 928 free_percpu(net->mib.ipv6_statistics); 929 free_percpu(net->mib.icmpv6_statistics); 930 kfree(net->mib.icmpv6msg_statistics); 931 } 932 933 static int __net_init inet6_net_init(struct net *net) 934 { 935 int err = 0; 936 937 net->ipv6.sysctl.bindv6only = 0; 938 net->ipv6.sysctl.icmpv6_time = 1*HZ; 939 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0; 940 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0; 941 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0; 942 943 /* By default, rate limit error messages. 944 * Except for pmtu discovery, it would break it. 945 * proc_do_large_bitmap needs pointer to the bitmap. 946 */ 947 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1); 948 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1); 949 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask; 950 951 net->ipv6.sysctl.flowlabel_consistency = 1; 952 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 953 net->ipv6.sysctl.idgen_retries = 3; 954 net->ipv6.sysctl.idgen_delay = 1 * HZ; 955 net->ipv6.sysctl.flowlabel_state_ranges = 0; 956 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 957 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 958 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 959 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 960 net->ipv6.sysctl.fib_notify_on_flag_change = 0; 961 atomic_set(&net->ipv6.fib6_sernum, 1); 962 963 err = ipv6_init_mibs(net); 964 if (err) 965 return err; 966 #ifdef CONFIG_PROC_FS 967 err = udp6_proc_init(net); 968 if (err) 969 goto out; 970 err = tcp6_proc_init(net); 971 if (err) 972 goto proc_tcp6_fail; 973 err = ac6_proc_init(net); 974 if (err) 975 goto proc_ac6_fail; 976 #endif 977 return err; 978 979 #ifdef CONFIG_PROC_FS 980 proc_ac6_fail: 981 tcp6_proc_exit(net); 982 proc_tcp6_fail: 983 udp6_proc_exit(net); 984 out: 985 ipv6_cleanup_mibs(net); 986 return err; 987 #endif 988 } 989 990 static void __net_exit inet6_net_exit(struct net *net) 991 { 992 #ifdef CONFIG_PROC_FS 993 udp6_proc_exit(net); 994 tcp6_proc_exit(net); 995 ac6_proc_exit(net); 996 #endif 997 ipv6_cleanup_mibs(net); 998 } 999 1000 static struct pernet_operations inet6_net_ops = { 1001 .init = inet6_net_init, 1002 .exit = inet6_net_exit, 1003 }; 1004 1005 static int ipv6_route_input(struct sk_buff *skb) 1006 { 1007 ip6_route_input(skb); 1008 return skb_dst(skb)->error; 1009 } 1010 1011 static const struct ipv6_stub ipv6_stub_impl = { 1012 .ipv6_sock_mc_join = ipv6_sock_mc_join, 1013 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 1014 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow, 1015 .ipv6_route_input = ipv6_route_input, 1016 .fib6_get_table = fib6_get_table, 1017 .fib6_table_lookup = fib6_table_lookup, 1018 .fib6_lookup = fib6_lookup, 1019 .fib6_select_path = fib6_select_path, 1020 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6, 1021 .fib6_nh_init = fib6_nh_init, 1022 .fib6_nh_release = fib6_nh_release, 1023 .fib6_update_sernum = fib6_update_sernum_stub, 1024 .fib6_rt_update = fib6_rt_update, 1025 .ip6_del_rt = ip6_del_rt, 1026 .udpv6_encap_enable = udpv6_encap_enable, 1027 .ndisc_send_na = ndisc_send_na, 1028 #if IS_ENABLED(CONFIG_XFRM) 1029 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu, 1030 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv, 1031 .xfrm6_rcv_encap = xfrm6_rcv_encap, 1032 #endif 1033 .nd_tbl = &nd_tbl, 1034 .ipv6_fragment = ip6_fragment, 1035 }; 1036 1037 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = { 1038 .inet6_bind = __inet6_bind, 1039 .udp6_lib_lookup = __udp6_lib_lookup, 1040 }; 1041 1042 static int __init inet6_init(void) 1043 { 1044 struct list_head *r; 1045 int err = 0; 1046 1047 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 1048 1049 /* Register the socket-side information for inet6_create. */ 1050 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 1051 INIT_LIST_HEAD(r); 1052 1053 if (disable_ipv6_mod) { 1054 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 1055 goto out; 1056 } 1057 1058 err = proto_register(&tcpv6_prot, 1); 1059 if (err) 1060 goto out; 1061 1062 err = proto_register(&udpv6_prot, 1); 1063 if (err) 1064 goto out_unregister_tcp_proto; 1065 1066 err = proto_register(&udplitev6_prot, 1); 1067 if (err) 1068 goto out_unregister_udp_proto; 1069 1070 err = proto_register(&rawv6_prot, 1); 1071 if (err) 1072 goto out_unregister_udplite_proto; 1073 1074 err = proto_register(&pingv6_prot, 1); 1075 if (err) 1076 goto out_unregister_raw_proto; 1077 1078 /* We MUST register RAW sockets before we create the ICMP6, 1079 * IGMP6, or NDISC control sockets. 1080 */ 1081 err = rawv6_init(); 1082 if (err) 1083 goto out_unregister_ping_proto; 1084 1085 /* Register the family here so that the init calls below will 1086 * be able to create sockets. (?? is this dangerous ??) 1087 */ 1088 err = sock_register(&inet6_family_ops); 1089 if (err) 1090 goto out_sock_register_fail; 1091 1092 /* 1093 * ipngwg API draft makes clear that the correct semantics 1094 * for TCP and UDP is to consider one TCP and UDP instance 1095 * in a host available by both INET and INET6 APIs and 1096 * able to communicate via both network protocols. 1097 */ 1098 1099 err = register_pernet_subsys(&inet6_net_ops); 1100 if (err) 1101 goto register_pernet_fail; 1102 err = ip6_mr_init(); 1103 if (err) 1104 goto ipmr_fail; 1105 err = icmpv6_init(); 1106 if (err) 1107 goto icmp_fail; 1108 err = ndisc_init(); 1109 if (err) 1110 goto ndisc_fail; 1111 err = igmp6_init(); 1112 if (err) 1113 goto igmp_fail; 1114 1115 err = ipv6_netfilter_init(); 1116 if (err) 1117 goto netfilter_fail; 1118 /* Create /proc/foo6 entries. */ 1119 #ifdef CONFIG_PROC_FS 1120 err = -ENOMEM; 1121 if (raw6_proc_init()) 1122 goto proc_raw6_fail; 1123 if (udplite6_proc_init()) 1124 goto proc_udplite6_fail; 1125 if (ipv6_misc_proc_init()) 1126 goto proc_misc6_fail; 1127 if (if6_proc_init()) 1128 goto proc_if6_fail; 1129 #endif 1130 err = ip6_route_init(); 1131 if (err) 1132 goto ip6_route_fail; 1133 err = ndisc_late_init(); 1134 if (err) 1135 goto ndisc_late_fail; 1136 err = ip6_flowlabel_init(); 1137 if (err) 1138 goto ip6_flowlabel_fail; 1139 err = ipv6_anycast_init(); 1140 if (err) 1141 goto ipv6_anycast_fail; 1142 err = addrconf_init(); 1143 if (err) 1144 goto addrconf_fail; 1145 1146 /* Init v6 extension headers. */ 1147 err = ipv6_exthdrs_init(); 1148 if (err) 1149 goto ipv6_exthdrs_fail; 1150 1151 err = ipv6_frag_init(); 1152 if (err) 1153 goto ipv6_frag_fail; 1154 1155 /* Init v6 transport protocols. */ 1156 err = udpv6_init(); 1157 if (err) 1158 goto udpv6_fail; 1159 1160 err = udplitev6_init(); 1161 if (err) 1162 goto udplitev6_fail; 1163 1164 err = udpv6_offload_init(); 1165 if (err) 1166 goto udpv6_offload_fail; 1167 1168 err = tcpv6_init(); 1169 if (err) 1170 goto tcpv6_fail; 1171 1172 err = ipv6_packet_init(); 1173 if (err) 1174 goto ipv6_packet_fail; 1175 1176 err = pingv6_init(); 1177 if (err) 1178 goto pingv6_fail; 1179 1180 err = calipso_init(); 1181 if (err) 1182 goto calipso_fail; 1183 1184 err = seg6_init(); 1185 if (err) 1186 goto seg6_fail; 1187 1188 err = rpl_init(); 1189 if (err) 1190 goto rpl_fail; 1191 1192 err = igmp6_late_init(); 1193 if (err) 1194 goto igmp6_late_err; 1195 1196 #ifdef CONFIG_SYSCTL 1197 err = ipv6_sysctl_register(); 1198 if (err) 1199 goto sysctl_fail; 1200 #endif 1201 1202 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1203 wmb(); 1204 ipv6_stub = &ipv6_stub_impl; 1205 ipv6_bpf_stub = &ipv6_bpf_stub_impl; 1206 out: 1207 return err; 1208 1209 #ifdef CONFIG_SYSCTL 1210 sysctl_fail: 1211 igmp6_late_cleanup(); 1212 #endif 1213 igmp6_late_err: 1214 rpl_exit(); 1215 rpl_fail: 1216 seg6_exit(); 1217 seg6_fail: 1218 calipso_exit(); 1219 calipso_fail: 1220 pingv6_exit(); 1221 pingv6_fail: 1222 ipv6_packet_cleanup(); 1223 ipv6_packet_fail: 1224 tcpv6_exit(); 1225 tcpv6_fail: 1226 udpv6_offload_exit(); 1227 udpv6_offload_fail: 1228 udplitev6_exit(); 1229 udplitev6_fail: 1230 udpv6_exit(); 1231 udpv6_fail: 1232 ipv6_frag_exit(); 1233 ipv6_frag_fail: 1234 ipv6_exthdrs_exit(); 1235 ipv6_exthdrs_fail: 1236 addrconf_cleanup(); 1237 addrconf_fail: 1238 ipv6_anycast_cleanup(); 1239 ipv6_anycast_fail: 1240 ip6_flowlabel_cleanup(); 1241 ip6_flowlabel_fail: 1242 ndisc_late_cleanup(); 1243 ndisc_late_fail: 1244 ip6_route_cleanup(); 1245 ip6_route_fail: 1246 #ifdef CONFIG_PROC_FS 1247 if6_proc_exit(); 1248 proc_if6_fail: 1249 ipv6_misc_proc_exit(); 1250 proc_misc6_fail: 1251 udplite6_proc_exit(); 1252 proc_udplite6_fail: 1253 raw6_proc_exit(); 1254 proc_raw6_fail: 1255 #endif 1256 ipv6_netfilter_fini(); 1257 netfilter_fail: 1258 igmp6_cleanup(); 1259 igmp_fail: 1260 ndisc_cleanup(); 1261 ndisc_fail: 1262 icmpv6_cleanup(); 1263 icmp_fail: 1264 ip6_mr_cleanup(); 1265 ipmr_fail: 1266 unregister_pernet_subsys(&inet6_net_ops); 1267 register_pernet_fail: 1268 sock_unregister(PF_INET6); 1269 rtnl_unregister_all(PF_INET6); 1270 out_sock_register_fail: 1271 rawv6_exit(); 1272 out_unregister_ping_proto: 1273 proto_unregister(&pingv6_prot); 1274 out_unregister_raw_proto: 1275 proto_unregister(&rawv6_prot); 1276 out_unregister_udplite_proto: 1277 proto_unregister(&udplitev6_prot); 1278 out_unregister_udp_proto: 1279 proto_unregister(&udpv6_prot); 1280 out_unregister_tcp_proto: 1281 proto_unregister(&tcpv6_prot); 1282 goto out; 1283 } 1284 module_init(inet6_init); 1285 1286 MODULE_ALIAS_NETPROTO(PF_INET6); 1287