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 (snum && inet_port_requires_bind_service(net, snum) && 299 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 300 return -EACCES; 301 302 if (flags & BIND_WITH_LOCK) 303 lock_sock(sk); 304 305 /* Check these errors (active socket, double bind). */ 306 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 307 err = -EINVAL; 308 goto out; 309 } 310 311 /* Check if the address belongs to the host. */ 312 if (addr_type == IPV6_ADDR_MAPPED) { 313 struct net_device *dev = NULL; 314 int chk_addr_ret; 315 316 /* Binding to v4-mapped address on a v6-only socket 317 * makes no sense 318 */ 319 if (sk->sk_ipv6only) { 320 err = -EINVAL; 321 goto out; 322 } 323 324 rcu_read_lock(); 325 if (sk->sk_bound_dev_if) { 326 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 327 if (!dev) { 328 err = -ENODEV; 329 goto out_unlock; 330 } 331 } 332 333 /* Reproduce AF_INET checks to make the bindings consistent */ 334 v4addr = addr->sin6_addr.s6_addr32[3]; 335 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr); 336 rcu_read_unlock(); 337 338 if (!inet_can_nonlocal_bind(net, inet) && 339 v4addr != htonl(INADDR_ANY) && 340 chk_addr_ret != RTN_LOCAL && 341 chk_addr_ret != RTN_MULTICAST && 342 chk_addr_ret != RTN_BROADCAST) { 343 err = -EADDRNOTAVAIL; 344 goto out; 345 } 346 } else { 347 if (addr_type != IPV6_ADDR_ANY) { 348 struct net_device *dev = NULL; 349 350 rcu_read_lock(); 351 if (__ipv6_addr_needs_scope_id(addr_type)) { 352 if (addr_len >= sizeof(struct sockaddr_in6) && 353 addr->sin6_scope_id) { 354 /* Override any existing binding, if another one 355 * is supplied by user. 356 */ 357 sk->sk_bound_dev_if = addr->sin6_scope_id; 358 } 359 360 /* Binding to link-local address requires an interface */ 361 if (!sk->sk_bound_dev_if) { 362 err = -EINVAL; 363 goto out_unlock; 364 } 365 } 366 367 if (sk->sk_bound_dev_if) { 368 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 369 if (!dev) { 370 err = -ENODEV; 371 goto out_unlock; 372 } 373 } 374 375 /* ipv4 addr of the socket is invalid. Only the 376 * unspecified and mapped address have a v4 equivalent. 377 */ 378 v4addr = LOOPBACK4_IPV6; 379 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 380 if (!ipv6_can_nonlocal_bind(net, inet) && 381 !ipv6_chk_addr(net, &addr->sin6_addr, 382 dev, 0)) { 383 err = -EADDRNOTAVAIL; 384 goto out_unlock; 385 } 386 } 387 rcu_read_unlock(); 388 } 389 } 390 391 inet->inet_rcv_saddr = v4addr; 392 inet->inet_saddr = v4addr; 393 394 sk->sk_v6_rcv_saddr = addr->sin6_addr; 395 396 if (!(addr_type & IPV6_ADDR_MULTICAST)) 397 np->saddr = addr->sin6_addr; 398 399 saved_ipv6only = sk->sk_ipv6only; 400 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED) 401 sk->sk_ipv6only = 1; 402 403 /* Make sure we are allowed to bind here. */ 404 if (snum || !(inet->bind_address_no_port || 405 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 406 if (sk->sk_prot->get_port(sk, snum)) { 407 sk->sk_ipv6only = saved_ipv6only; 408 inet_reset_saddr(sk); 409 err = -EADDRINUSE; 410 goto out; 411 } 412 if (!(flags & BIND_FROM_BPF)) { 413 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk); 414 if (err) { 415 sk->sk_ipv6only = saved_ipv6only; 416 inet_reset_saddr(sk); 417 goto out; 418 } 419 } 420 } 421 422 if (addr_type != IPV6_ADDR_ANY) 423 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 424 if (snum) 425 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 426 inet->inet_sport = htons(inet->inet_num); 427 inet->inet_dport = 0; 428 inet->inet_daddr = 0; 429 out: 430 if (flags & BIND_WITH_LOCK) 431 release_sock(sk); 432 return err; 433 out_unlock: 434 rcu_read_unlock(); 435 goto out; 436 } 437 438 /* bind for INET6 API */ 439 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 440 { 441 struct sock *sk = sock->sk; 442 int err = 0; 443 444 /* If the socket has its own bind function then use it. */ 445 if (sk->sk_prot->bind) 446 return sk->sk_prot->bind(sk, uaddr, addr_len); 447 448 if (addr_len < SIN6_LEN_RFC2133) 449 return -EINVAL; 450 451 /* BPF prog is run before any checks are done so that if the prog 452 * changes context in a wrong way it will be caught. 453 */ 454 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr); 455 if (err) 456 return err; 457 458 return __inet6_bind(sk, uaddr, addr_len, BIND_WITH_LOCK); 459 } 460 EXPORT_SYMBOL(inet6_bind); 461 462 int inet6_release(struct socket *sock) 463 { 464 struct sock *sk = sock->sk; 465 466 if (!sk) 467 return -EINVAL; 468 469 /* Free mc lists */ 470 ipv6_sock_mc_close(sk); 471 472 /* Free ac lists */ 473 ipv6_sock_ac_close(sk); 474 475 return inet_release(sock); 476 } 477 EXPORT_SYMBOL(inet6_release); 478 479 void inet6_destroy_sock(struct sock *sk) 480 { 481 struct ipv6_pinfo *np = inet6_sk(sk); 482 struct sk_buff *skb; 483 struct ipv6_txoptions *opt; 484 485 /* Release rx options */ 486 487 skb = xchg(&np->pktoptions, NULL); 488 kfree_skb(skb); 489 490 skb = xchg(&np->rxpmtu, NULL); 491 kfree_skb(skb); 492 493 /* Free flowlabels */ 494 fl6_free_socklist(sk); 495 496 /* Free tx options */ 497 498 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 499 if (opt) { 500 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 501 txopt_put(opt); 502 } 503 } 504 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 505 506 /* 507 * This does both peername and sockname. 508 */ 509 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 510 int peer) 511 { 512 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 513 struct sock *sk = sock->sk; 514 struct inet_sock *inet = inet_sk(sk); 515 struct ipv6_pinfo *np = inet6_sk(sk); 516 517 sin->sin6_family = AF_INET6; 518 sin->sin6_flowinfo = 0; 519 sin->sin6_scope_id = 0; 520 if (peer) { 521 if (!inet->inet_dport) 522 return -ENOTCONN; 523 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 524 peer == 1) 525 return -ENOTCONN; 526 sin->sin6_port = inet->inet_dport; 527 sin->sin6_addr = sk->sk_v6_daddr; 528 if (np->sndflow) 529 sin->sin6_flowinfo = np->flow_label; 530 } else { 531 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 532 sin->sin6_addr = np->saddr; 533 else 534 sin->sin6_addr = sk->sk_v6_rcv_saddr; 535 sin->sin6_port = inet->inet_sport; 536 } 537 if (cgroup_bpf_enabled) 538 BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin, 539 peer ? BPF_CGROUP_INET6_GETPEERNAME : 540 BPF_CGROUP_INET6_GETSOCKNAME, 541 NULL); 542 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 543 sk->sk_bound_dev_if); 544 return sizeof(*sin); 545 } 546 EXPORT_SYMBOL(inet6_getname); 547 548 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 549 { 550 void __user *argp = (void __user *)arg; 551 struct sock *sk = sock->sk; 552 struct net *net = sock_net(sk); 553 554 switch (cmd) { 555 case SIOCADDRT: 556 case SIOCDELRT: { 557 struct in6_rtmsg rtmsg; 558 559 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg))) 560 return -EFAULT; 561 return ipv6_route_ioctl(net, cmd, &rtmsg); 562 } 563 case SIOCSIFADDR: 564 return addrconf_add_ifaddr(net, argp); 565 case SIOCDIFADDR: 566 return addrconf_del_ifaddr(net, argp); 567 case SIOCSIFDSTADDR: 568 return addrconf_set_dstaddr(net, argp); 569 default: 570 if (!sk->sk_prot->ioctl) 571 return -ENOIOCTLCMD; 572 return sk->sk_prot->ioctl(sk, cmd, arg); 573 } 574 /*NOTREACHED*/ 575 return 0; 576 } 577 EXPORT_SYMBOL(inet6_ioctl); 578 579 #ifdef CONFIG_COMPAT 580 struct compat_in6_rtmsg { 581 struct in6_addr rtmsg_dst; 582 struct in6_addr rtmsg_src; 583 struct in6_addr rtmsg_gateway; 584 u32 rtmsg_type; 585 u16 rtmsg_dst_len; 586 u16 rtmsg_src_len; 587 u32 rtmsg_metric; 588 u32 rtmsg_info; 589 u32 rtmsg_flags; 590 s32 rtmsg_ifindex; 591 }; 592 593 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd, 594 struct compat_in6_rtmsg __user *ur) 595 { 596 struct in6_rtmsg rt; 597 598 if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst, 599 3 * sizeof(struct in6_addr)) || 600 get_user(rt.rtmsg_type, &ur->rtmsg_type) || 601 get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) || 602 get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) || 603 get_user(rt.rtmsg_metric, &ur->rtmsg_metric) || 604 get_user(rt.rtmsg_info, &ur->rtmsg_info) || 605 get_user(rt.rtmsg_flags, &ur->rtmsg_flags) || 606 get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex)) 607 return -EFAULT; 608 609 610 return ipv6_route_ioctl(sock_net(sk), cmd, &rt); 611 } 612 613 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 614 { 615 void __user *argp = compat_ptr(arg); 616 struct sock *sk = sock->sk; 617 618 switch (cmd) { 619 case SIOCADDRT: 620 case SIOCDELRT: 621 return inet6_compat_routing_ioctl(sk, cmd, argp); 622 default: 623 return -ENOIOCTLCMD; 624 } 625 } 626 EXPORT_SYMBOL_GPL(inet6_compat_ioctl); 627 #endif /* CONFIG_COMPAT */ 628 629 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *, 630 size_t)); 631 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 632 { 633 struct sock *sk = sock->sk; 634 635 if (unlikely(inet_send_prepare(sk))) 636 return -EAGAIN; 637 638 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udpv6_sendmsg, 639 sk, msg, size); 640 } 641 642 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *, 643 size_t, int, int, int *)); 644 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 645 int flags) 646 { 647 struct sock *sk = sock->sk; 648 int addr_len = 0; 649 int err; 650 651 if (likely(!(flags & MSG_ERRQUEUE))) 652 sock_rps_record_flow(sk); 653 654 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udpv6_recvmsg, 655 sk, msg, size, flags & MSG_DONTWAIT, 656 flags & ~MSG_DONTWAIT, &addr_len); 657 if (err >= 0) 658 msg->msg_namelen = addr_len; 659 return err; 660 } 661 662 const struct proto_ops inet6_stream_ops = { 663 .family = PF_INET6, 664 .flags = PROTO_CMSG_DATA_ONLY, 665 .owner = THIS_MODULE, 666 .release = inet6_release, 667 .bind = inet6_bind, 668 .connect = inet_stream_connect, /* ok */ 669 .socketpair = sock_no_socketpair, /* a do nothing */ 670 .accept = inet_accept, /* ok */ 671 .getname = inet6_getname, 672 .poll = tcp_poll, /* ok */ 673 .ioctl = inet6_ioctl, /* must change */ 674 .gettstamp = sock_gettstamp, 675 .listen = inet_listen, /* ok */ 676 .shutdown = inet_shutdown, /* ok */ 677 .setsockopt = sock_common_setsockopt, /* ok */ 678 .getsockopt = sock_common_getsockopt, /* ok */ 679 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 680 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 681 #ifdef CONFIG_MMU 682 .mmap = tcp_mmap, 683 #endif 684 .sendpage = inet_sendpage, 685 .sendmsg_locked = tcp_sendmsg_locked, 686 .sendpage_locked = tcp_sendpage_locked, 687 .splice_read = tcp_splice_read, 688 .read_sock = tcp_read_sock, 689 .peek_len = tcp_peek_len, 690 #ifdef CONFIG_COMPAT 691 .compat_ioctl = inet6_compat_ioctl, 692 #endif 693 .set_rcvlowat = tcp_set_rcvlowat, 694 }; 695 696 const struct proto_ops inet6_dgram_ops = { 697 .family = PF_INET6, 698 .owner = THIS_MODULE, 699 .release = inet6_release, 700 .bind = inet6_bind, 701 .connect = inet_dgram_connect, /* ok */ 702 .socketpair = sock_no_socketpair, /* a do nothing */ 703 .accept = sock_no_accept, /* a do nothing */ 704 .getname = inet6_getname, 705 .poll = udp_poll, /* ok */ 706 .ioctl = inet6_ioctl, /* must change */ 707 .gettstamp = sock_gettstamp, 708 .listen = sock_no_listen, /* ok */ 709 .shutdown = inet_shutdown, /* ok */ 710 .setsockopt = sock_common_setsockopt, /* ok */ 711 .getsockopt = sock_common_getsockopt, /* ok */ 712 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 713 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 714 .mmap = sock_no_mmap, 715 .sendpage = sock_no_sendpage, 716 .set_peek_off = sk_set_peek_off, 717 #ifdef CONFIG_COMPAT 718 .compat_ioctl = inet6_compat_ioctl, 719 #endif 720 }; 721 722 static const struct net_proto_family inet6_family_ops = { 723 .family = PF_INET6, 724 .create = inet6_create, 725 .owner = THIS_MODULE, 726 }; 727 728 int inet6_register_protosw(struct inet_protosw *p) 729 { 730 struct list_head *lh; 731 struct inet_protosw *answer; 732 struct list_head *last_perm; 733 int protocol = p->protocol; 734 int ret; 735 736 spin_lock_bh(&inetsw6_lock); 737 738 ret = -EINVAL; 739 if (p->type >= SOCK_MAX) 740 goto out_illegal; 741 742 /* If we are trying to override a permanent protocol, bail. */ 743 answer = NULL; 744 ret = -EPERM; 745 last_perm = &inetsw6[p->type]; 746 list_for_each(lh, &inetsw6[p->type]) { 747 answer = list_entry(lh, struct inet_protosw, list); 748 749 /* Check only the non-wild match. */ 750 if (INET_PROTOSW_PERMANENT & answer->flags) { 751 if (protocol == answer->protocol) 752 break; 753 last_perm = lh; 754 } 755 756 answer = NULL; 757 } 758 if (answer) 759 goto out_permanent; 760 761 /* Add the new entry after the last permanent entry if any, so that 762 * the new entry does not override a permanent entry when matched with 763 * a wild-card protocol. But it is allowed to override any existing 764 * non-permanent entry. This means that when we remove this entry, the 765 * system automatically returns to the old behavior. 766 */ 767 list_add_rcu(&p->list, last_perm); 768 ret = 0; 769 out: 770 spin_unlock_bh(&inetsw6_lock); 771 return ret; 772 773 out_permanent: 774 pr_err("Attempt to override permanent protocol %d\n", protocol); 775 goto out; 776 777 out_illegal: 778 pr_err("Ignoring attempt to register invalid socket type %d\n", 779 p->type); 780 goto out; 781 } 782 EXPORT_SYMBOL(inet6_register_protosw); 783 784 void 785 inet6_unregister_protosw(struct inet_protosw *p) 786 { 787 if (INET_PROTOSW_PERMANENT & p->flags) { 788 pr_err("Attempt to unregister permanent protocol %d\n", 789 p->protocol); 790 } else { 791 spin_lock_bh(&inetsw6_lock); 792 list_del_rcu(&p->list); 793 spin_unlock_bh(&inetsw6_lock); 794 795 synchronize_net(); 796 } 797 } 798 EXPORT_SYMBOL(inet6_unregister_protosw); 799 800 int inet6_sk_rebuild_header(struct sock *sk) 801 { 802 struct ipv6_pinfo *np = inet6_sk(sk); 803 struct dst_entry *dst; 804 805 dst = __sk_dst_check(sk, np->dst_cookie); 806 807 if (!dst) { 808 struct inet_sock *inet = inet_sk(sk); 809 struct in6_addr *final_p, final; 810 struct flowi6 fl6; 811 812 memset(&fl6, 0, sizeof(fl6)); 813 fl6.flowi6_proto = sk->sk_protocol; 814 fl6.daddr = sk->sk_v6_daddr; 815 fl6.saddr = np->saddr; 816 fl6.flowlabel = np->flow_label; 817 fl6.flowi6_oif = sk->sk_bound_dev_if; 818 fl6.flowi6_mark = sk->sk_mark; 819 fl6.fl6_dport = inet->inet_dport; 820 fl6.fl6_sport = inet->inet_sport; 821 fl6.flowi6_uid = sk->sk_uid; 822 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 823 824 rcu_read_lock(); 825 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 826 &final); 827 rcu_read_unlock(); 828 829 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); 830 if (IS_ERR(dst)) { 831 sk->sk_route_caps = 0; 832 sk->sk_err_soft = -PTR_ERR(dst); 833 return PTR_ERR(dst); 834 } 835 836 ip6_dst_store(sk, dst, NULL, NULL); 837 } 838 839 return 0; 840 } 841 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 842 843 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 844 const struct inet6_skb_parm *opt) 845 { 846 const struct ipv6_pinfo *np = inet6_sk(sk); 847 848 if (np->rxopt.all) { 849 if (((opt->flags & IP6SKB_HOPBYHOP) && 850 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 851 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 852 np->rxopt.bits.rxflow) || 853 (opt->srcrt && (np->rxopt.bits.srcrt || 854 np->rxopt.bits.osrcrt)) || 855 ((opt->dst1 || opt->dst0) && 856 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 857 return true; 858 } 859 return false; 860 } 861 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 862 863 static struct packet_type ipv6_packet_type __read_mostly = { 864 .type = cpu_to_be16(ETH_P_IPV6), 865 .func = ipv6_rcv, 866 .list_func = ipv6_list_rcv, 867 }; 868 869 static int __init ipv6_packet_init(void) 870 { 871 dev_add_pack(&ipv6_packet_type); 872 return 0; 873 } 874 875 static void ipv6_packet_cleanup(void) 876 { 877 dev_remove_pack(&ipv6_packet_type); 878 } 879 880 static int __net_init ipv6_init_mibs(struct net *net) 881 { 882 int i; 883 884 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 885 if (!net->mib.udp_stats_in6) 886 return -ENOMEM; 887 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 888 if (!net->mib.udplite_stats_in6) 889 goto err_udplite_mib; 890 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 891 if (!net->mib.ipv6_statistics) 892 goto err_ip_mib; 893 894 for_each_possible_cpu(i) { 895 struct ipstats_mib *af_inet6_stats; 896 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 897 u64_stats_init(&af_inet6_stats->syncp); 898 } 899 900 901 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 902 if (!net->mib.icmpv6_statistics) 903 goto err_icmp_mib; 904 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 905 GFP_KERNEL); 906 if (!net->mib.icmpv6msg_statistics) 907 goto err_icmpmsg_mib; 908 return 0; 909 910 err_icmpmsg_mib: 911 free_percpu(net->mib.icmpv6_statistics); 912 err_icmp_mib: 913 free_percpu(net->mib.ipv6_statistics); 914 err_ip_mib: 915 free_percpu(net->mib.udplite_stats_in6); 916 err_udplite_mib: 917 free_percpu(net->mib.udp_stats_in6); 918 return -ENOMEM; 919 } 920 921 static void ipv6_cleanup_mibs(struct net *net) 922 { 923 free_percpu(net->mib.udp_stats_in6); 924 free_percpu(net->mib.udplite_stats_in6); 925 free_percpu(net->mib.ipv6_statistics); 926 free_percpu(net->mib.icmpv6_statistics); 927 kfree(net->mib.icmpv6msg_statistics); 928 } 929 930 static int __net_init inet6_net_init(struct net *net) 931 { 932 int err = 0; 933 934 net->ipv6.sysctl.bindv6only = 0; 935 net->ipv6.sysctl.icmpv6_time = 1*HZ; 936 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0; 937 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0; 938 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0; 939 940 /* By default, rate limit error messages. 941 * Except for pmtu discovery, it would break it. 942 * proc_do_large_bitmap needs pointer to the bitmap. 943 */ 944 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1); 945 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1); 946 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask; 947 948 net->ipv6.sysctl.flowlabel_consistency = 1; 949 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 950 net->ipv6.sysctl.idgen_retries = 3; 951 net->ipv6.sysctl.idgen_delay = 1 * HZ; 952 net->ipv6.sysctl.flowlabel_state_ranges = 0; 953 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 954 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 955 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 956 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 957 atomic_set(&net->ipv6.fib6_sernum, 1); 958 959 err = ipv6_init_mibs(net); 960 if (err) 961 return err; 962 #ifdef CONFIG_PROC_FS 963 err = udp6_proc_init(net); 964 if (err) 965 goto out; 966 err = tcp6_proc_init(net); 967 if (err) 968 goto proc_tcp6_fail; 969 err = ac6_proc_init(net); 970 if (err) 971 goto proc_ac6_fail; 972 #endif 973 return err; 974 975 #ifdef CONFIG_PROC_FS 976 proc_ac6_fail: 977 tcp6_proc_exit(net); 978 proc_tcp6_fail: 979 udp6_proc_exit(net); 980 out: 981 ipv6_cleanup_mibs(net); 982 return err; 983 #endif 984 } 985 986 static void __net_exit inet6_net_exit(struct net *net) 987 { 988 #ifdef CONFIG_PROC_FS 989 udp6_proc_exit(net); 990 tcp6_proc_exit(net); 991 ac6_proc_exit(net); 992 #endif 993 ipv6_cleanup_mibs(net); 994 } 995 996 static struct pernet_operations inet6_net_ops = { 997 .init = inet6_net_init, 998 .exit = inet6_net_exit, 999 }; 1000 1001 static int ipv6_route_input(struct sk_buff *skb) 1002 { 1003 ip6_route_input(skb); 1004 return skb_dst(skb)->error; 1005 } 1006 1007 static const struct ipv6_stub ipv6_stub_impl = { 1008 .ipv6_sock_mc_join = ipv6_sock_mc_join, 1009 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 1010 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow, 1011 .ipv6_route_input = ipv6_route_input, 1012 .fib6_get_table = fib6_get_table, 1013 .fib6_table_lookup = fib6_table_lookup, 1014 .fib6_lookup = fib6_lookup, 1015 .fib6_select_path = fib6_select_path, 1016 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6, 1017 .fib6_nh_init = fib6_nh_init, 1018 .fib6_nh_release = fib6_nh_release, 1019 .fib6_update_sernum = fib6_update_sernum_stub, 1020 .fib6_rt_update = fib6_rt_update, 1021 .ip6_del_rt = ip6_del_rt, 1022 .udpv6_encap_enable = udpv6_encap_enable, 1023 .ndisc_send_na = ndisc_send_na, 1024 #if IS_ENABLED(CONFIG_XFRM) 1025 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu, 1026 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv, 1027 .xfrm6_rcv_encap = xfrm6_rcv_encap, 1028 #endif 1029 .nd_tbl = &nd_tbl, 1030 .ipv6_fragment = ip6_fragment, 1031 }; 1032 1033 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = { 1034 .inet6_bind = __inet6_bind, 1035 .udp6_lib_lookup = __udp6_lib_lookup, 1036 }; 1037 1038 static int __init inet6_init(void) 1039 { 1040 struct list_head *r; 1041 int err = 0; 1042 1043 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 1044 1045 /* Register the socket-side information for inet6_create. */ 1046 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 1047 INIT_LIST_HEAD(r); 1048 1049 if (disable_ipv6_mod) { 1050 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 1051 goto out; 1052 } 1053 1054 err = proto_register(&tcpv6_prot, 1); 1055 if (err) 1056 goto out; 1057 1058 err = proto_register(&udpv6_prot, 1); 1059 if (err) 1060 goto out_unregister_tcp_proto; 1061 1062 err = proto_register(&udplitev6_prot, 1); 1063 if (err) 1064 goto out_unregister_udp_proto; 1065 1066 err = proto_register(&rawv6_prot, 1); 1067 if (err) 1068 goto out_unregister_udplite_proto; 1069 1070 err = proto_register(&pingv6_prot, 1); 1071 if (err) 1072 goto out_unregister_raw_proto; 1073 1074 /* We MUST register RAW sockets before we create the ICMP6, 1075 * IGMP6, or NDISC control sockets. 1076 */ 1077 err = rawv6_init(); 1078 if (err) 1079 goto out_unregister_ping_proto; 1080 1081 /* Register the family here so that the init calls below will 1082 * be able to create sockets. (?? is this dangerous ??) 1083 */ 1084 err = sock_register(&inet6_family_ops); 1085 if (err) 1086 goto out_sock_register_fail; 1087 1088 /* 1089 * ipngwg API draft makes clear that the correct semantics 1090 * for TCP and UDP is to consider one TCP and UDP instance 1091 * in a host available by both INET and INET6 APIs and 1092 * able to communicate via both network protocols. 1093 */ 1094 1095 err = register_pernet_subsys(&inet6_net_ops); 1096 if (err) 1097 goto register_pernet_fail; 1098 err = ip6_mr_init(); 1099 if (err) 1100 goto ipmr_fail; 1101 err = icmpv6_init(); 1102 if (err) 1103 goto icmp_fail; 1104 err = ndisc_init(); 1105 if (err) 1106 goto ndisc_fail; 1107 err = igmp6_init(); 1108 if (err) 1109 goto igmp_fail; 1110 1111 err = ipv6_netfilter_init(); 1112 if (err) 1113 goto netfilter_fail; 1114 /* Create /proc/foo6 entries. */ 1115 #ifdef CONFIG_PROC_FS 1116 err = -ENOMEM; 1117 if (raw6_proc_init()) 1118 goto proc_raw6_fail; 1119 if (udplite6_proc_init()) 1120 goto proc_udplite6_fail; 1121 if (ipv6_misc_proc_init()) 1122 goto proc_misc6_fail; 1123 if (if6_proc_init()) 1124 goto proc_if6_fail; 1125 #endif 1126 err = ip6_route_init(); 1127 if (err) 1128 goto ip6_route_fail; 1129 err = ndisc_late_init(); 1130 if (err) 1131 goto ndisc_late_fail; 1132 err = ip6_flowlabel_init(); 1133 if (err) 1134 goto ip6_flowlabel_fail; 1135 err = ipv6_anycast_init(); 1136 if (err) 1137 goto ipv6_anycast_fail; 1138 err = addrconf_init(); 1139 if (err) 1140 goto addrconf_fail; 1141 1142 /* Init v6 extension headers. */ 1143 err = ipv6_exthdrs_init(); 1144 if (err) 1145 goto ipv6_exthdrs_fail; 1146 1147 err = ipv6_frag_init(); 1148 if (err) 1149 goto ipv6_frag_fail; 1150 1151 /* Init v6 transport protocols. */ 1152 err = udpv6_init(); 1153 if (err) 1154 goto udpv6_fail; 1155 1156 err = udplitev6_init(); 1157 if (err) 1158 goto udplitev6_fail; 1159 1160 err = udpv6_offload_init(); 1161 if (err) 1162 goto udpv6_offload_fail; 1163 1164 err = tcpv6_init(); 1165 if (err) 1166 goto tcpv6_fail; 1167 1168 err = ipv6_packet_init(); 1169 if (err) 1170 goto ipv6_packet_fail; 1171 1172 err = pingv6_init(); 1173 if (err) 1174 goto pingv6_fail; 1175 1176 err = calipso_init(); 1177 if (err) 1178 goto calipso_fail; 1179 1180 err = seg6_init(); 1181 if (err) 1182 goto seg6_fail; 1183 1184 err = rpl_init(); 1185 if (err) 1186 goto rpl_fail; 1187 1188 err = igmp6_late_init(); 1189 if (err) 1190 goto igmp6_late_err; 1191 1192 #ifdef CONFIG_SYSCTL 1193 err = ipv6_sysctl_register(); 1194 if (err) 1195 goto sysctl_fail; 1196 #endif 1197 1198 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1199 wmb(); 1200 ipv6_stub = &ipv6_stub_impl; 1201 ipv6_bpf_stub = &ipv6_bpf_stub_impl; 1202 out: 1203 return err; 1204 1205 #ifdef CONFIG_SYSCTL 1206 sysctl_fail: 1207 igmp6_late_cleanup(); 1208 #endif 1209 igmp6_late_err: 1210 rpl_exit(); 1211 rpl_fail: 1212 seg6_exit(); 1213 seg6_fail: 1214 calipso_exit(); 1215 calipso_fail: 1216 pingv6_exit(); 1217 pingv6_fail: 1218 ipv6_packet_cleanup(); 1219 ipv6_packet_fail: 1220 tcpv6_exit(); 1221 tcpv6_fail: 1222 udpv6_offload_exit(); 1223 udpv6_offload_fail: 1224 udplitev6_exit(); 1225 udplitev6_fail: 1226 udpv6_exit(); 1227 udpv6_fail: 1228 ipv6_frag_exit(); 1229 ipv6_frag_fail: 1230 ipv6_exthdrs_exit(); 1231 ipv6_exthdrs_fail: 1232 addrconf_cleanup(); 1233 addrconf_fail: 1234 ipv6_anycast_cleanup(); 1235 ipv6_anycast_fail: 1236 ip6_flowlabel_cleanup(); 1237 ip6_flowlabel_fail: 1238 ndisc_late_cleanup(); 1239 ndisc_late_fail: 1240 ip6_route_cleanup(); 1241 ip6_route_fail: 1242 #ifdef CONFIG_PROC_FS 1243 if6_proc_exit(); 1244 proc_if6_fail: 1245 ipv6_misc_proc_exit(); 1246 proc_misc6_fail: 1247 udplite6_proc_exit(); 1248 proc_udplite6_fail: 1249 raw6_proc_exit(); 1250 proc_raw6_fail: 1251 #endif 1252 ipv6_netfilter_fini(); 1253 netfilter_fail: 1254 igmp6_cleanup(); 1255 igmp_fail: 1256 ndisc_cleanup(); 1257 ndisc_fail: 1258 icmpv6_cleanup(); 1259 icmp_fail: 1260 ip6_mr_cleanup(); 1261 ipmr_fail: 1262 unregister_pernet_subsys(&inet6_net_ops); 1263 register_pernet_fail: 1264 sock_unregister(PF_INET6); 1265 rtnl_unregister_all(PF_INET6); 1266 out_sock_register_fail: 1267 rawv6_exit(); 1268 out_unregister_ping_proto: 1269 proto_unregister(&pingv6_prot); 1270 out_unregister_raw_proto: 1271 proto_unregister(&rawv6_prot); 1272 out_unregister_udplite_proto: 1273 proto_unregister(&udplitev6_prot); 1274 out_unregister_udp_proto: 1275 proto_unregister(&udpv6_prot); 1276 out_unregister_tcp_proto: 1277 proto_unregister(&tcpv6_prot); 1278 goto out; 1279 } 1280 module_init(inet6_init); 1281 1282 MODULE_ALIAS_NETPROTO(PF_INET6); 1283