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 42 #include <net/ip.h> 43 #include <net/ipv6.h> 44 #include <net/udp.h> 45 #include <net/tcp.h> 46 #include <net/ping.h> 47 #include <net/protocol.h> 48 #include <net/inet_common.h> 49 #include <net/route.h> 50 #include <net/transp_v6.h> 51 #include <net/ip6_route.h> 52 #include <net/addrconf.h> 53 #include <net/ndisc.h> 54 #ifdef CONFIG_IPV6_TUNNEL 55 #include <net/ip6_tunnel.h> 56 #endif 57 #include <net/calipso.h> 58 #include <net/seg6.h> 59 #include <net/rpl.h> 60 #include <net/compat.h> 61 #include <net/xfrm.h> 62 #include <net/ioam6.h> 63 #include <net/rawv6.h> 64 #include <net/rps.h> 65 66 #include <linux/uaccess.h> 67 #include <linux/mroute6.h> 68 69 #include "ip6_offload.h" 70 71 /* The inetsw6 table contains everything that inet6_create needs to 72 * build a new socket. 73 */ 74 static struct list_head inetsw6[SOCK_MAX]; 75 static DEFINE_SPINLOCK(inetsw6_lock); 76 77 struct ipv6_params ipv6_defaults = { 78 .disable_ipv6 = 0, 79 .autoconf = 1, 80 }; 81 82 module_param_named(disable, disable_ipv6_mod, int, 0444); 83 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 84 85 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 86 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 87 88 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 89 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 90 91 static struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 92 { 93 const int offset = sk->sk_prot->ipv6_pinfo_offset; 94 95 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 96 } 97 98 void inet6_sock_destruct(struct sock *sk) 99 { 100 inet6_cleanup_sock(sk); 101 inet_sock_destruct(sk); 102 } 103 EXPORT_SYMBOL_GPL(inet6_sock_destruct); 104 105 static int inet6_create(struct net *net, struct socket *sock, int protocol, 106 int kern) 107 { 108 struct inet_sock *inet; 109 struct ipv6_pinfo *np; 110 struct sock *sk; 111 struct inet_protosw *answer; 112 struct proto *answer_prot; 113 unsigned char answer_flags; 114 int try_loading_module = 0; 115 int err; 116 117 if (protocol < 0 || protocol >= IPPROTO_MAX) 118 return -EINVAL; 119 120 /* Look for the requested type/protocol pair. */ 121 lookup_protocol: 122 err = -ESOCKTNOSUPPORT; 123 rcu_read_lock(); 124 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 125 126 err = 0; 127 /* Check the non-wild match. */ 128 if (protocol == answer->protocol) { 129 if (protocol != IPPROTO_IP) 130 break; 131 } else { 132 /* Check for the two wild cases. */ 133 if (IPPROTO_IP == protocol) { 134 protocol = answer->protocol; 135 break; 136 } 137 if (IPPROTO_IP == answer->protocol) 138 break; 139 } 140 err = -EPROTONOSUPPORT; 141 } 142 143 if (err) { 144 if (try_loading_module < 2) { 145 rcu_read_unlock(); 146 /* 147 * Be more specific, e.g. net-pf-10-proto-132-type-1 148 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 149 */ 150 if (++try_loading_module == 1) 151 request_module("net-pf-%d-proto-%d-type-%d", 152 PF_INET6, protocol, sock->type); 153 /* 154 * Fall back to generic, e.g. net-pf-10-proto-132 155 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 156 */ 157 else 158 request_module("net-pf-%d-proto-%d", 159 PF_INET6, protocol); 160 goto lookup_protocol; 161 } else 162 goto out_rcu_unlock; 163 } 164 165 err = -EPERM; 166 if (sock->type == SOCK_RAW && !kern && 167 !ns_capable(net->user_ns, CAP_NET_RAW)) 168 goto out_rcu_unlock; 169 170 sock->ops = answer->ops; 171 answer_prot = answer->prot; 172 answer_flags = answer->flags; 173 rcu_read_unlock(); 174 175 WARN_ON(!answer_prot->slab); 176 177 err = -ENOBUFS; 178 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 179 if (!sk) 180 goto out; 181 182 sock_init_data(sock, sk); 183 184 err = 0; 185 if (INET_PROTOSW_REUSE & answer_flags) 186 sk->sk_reuse = SK_CAN_REUSE; 187 188 if (INET_PROTOSW_ICSK & answer_flags) 189 inet_init_csk_locks(sk); 190 191 inet = inet_sk(sk); 192 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags); 193 194 if (SOCK_RAW == sock->type) { 195 inet->inet_num = protocol; 196 if (IPPROTO_RAW == protocol) 197 inet_set_bit(HDRINCL, sk); 198 } 199 200 sk->sk_destruct = inet6_sock_destruct; 201 sk->sk_family = PF_INET6; 202 sk->sk_protocol = protocol; 203 204 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 205 206 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 207 np->hop_limit = -1; 208 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 209 inet6_set_bit(MC6_LOOP, sk); 210 inet6_set_bit(MC6_ALL, sk); 211 np->pmtudisc = IPV6_PMTUDISC_WANT; 212 inet6_assign_bit(REPFLOW, sk, READ_ONCE(net->ipv6.sysctl.flowlabel_reflect) & 213 FLOWLABEL_REFLECT_ESTABLISHED); 214 sk->sk_ipv6only = READ_ONCE(net->ipv6.sysctl.bindv6only); 215 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash); 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_set_bit(MC_LOOP, sk); 223 inet->mc_ttl = 1; 224 inet->mc_index = 0; 225 RCU_INIT_POINTER(inet->mc_list, NULL); 226 inet->rcv_tos = 0; 227 228 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc)) 229 inet->pmtudisc = IP_PMTUDISC_DONT; 230 else 231 inet->pmtudisc = IP_PMTUDISC_WANT; 232 233 if (inet->inet_num) { 234 /* It assumes that any protocol which allows 235 * the user to assign a number at socket 236 * creation time automatically shares. 237 */ 238 inet->inet_sport = htons(inet->inet_num); 239 err = sk->sk_prot->hash(sk); 240 if (err) 241 goto out_sk_release; 242 } 243 if (sk->sk_prot->init) { 244 err = sk->sk_prot->init(sk); 245 if (err) 246 goto out_sk_release; 247 } 248 249 if (!kern) { 250 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 251 if (err) 252 goto out_sk_release; 253 } 254 out: 255 return err; 256 out_rcu_unlock: 257 rcu_read_unlock(); 258 goto out; 259 out_sk_release: 260 sk_common_release(sk); 261 sock->sk = NULL; 262 goto out; 263 } 264 265 int __inet6_bind(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len, 266 u32 flags) 267 { 268 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 269 struct inet_sock *inet = inet_sk(sk); 270 struct ipv6_pinfo *np = inet6_sk(sk); 271 struct net *net = sock_net(sk); 272 __be32 v4addr = 0; 273 unsigned short snum; 274 bool saved_ipv6only; 275 int addr_type = 0; 276 int err = 0; 277 278 if (addr->sin6_family != AF_INET6) 279 return -EAFNOSUPPORT; 280 281 addr_type = ipv6_addr_type(&addr->sin6_addr); 282 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM) 283 return -EINVAL; 284 285 snum = ntohs(addr->sin6_port); 286 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) && 287 snum && inet_port_requires_bind_service(net, snum) && 288 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 289 return -EACCES; 290 291 if (flags & BIND_WITH_LOCK) 292 lock_sock(sk); 293 294 /* Check these errors (active socket, double bind). */ 295 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 296 err = -EINVAL; 297 goto out; 298 } 299 300 /* Check if the address belongs to the host. */ 301 if (addr_type == IPV6_ADDR_MAPPED) { 302 struct net_device *dev = NULL; 303 int chk_addr_ret; 304 305 /* Binding to v4-mapped address on a v6-only socket 306 * makes no sense 307 */ 308 if (ipv6_only_sock(sk)) { 309 err = -EINVAL; 310 goto out; 311 } 312 313 rcu_read_lock(); 314 if (sk->sk_bound_dev_if) { 315 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 316 if (!dev) { 317 err = -ENODEV; 318 goto out_unlock; 319 } 320 } 321 322 /* Reproduce AF_INET checks to make the bindings consistent */ 323 v4addr = addr->sin6_addr.s6_addr32[3]; 324 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr); 325 rcu_read_unlock(); 326 327 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr, 328 chk_addr_ret)) { 329 err = -EADDRNOTAVAIL; 330 goto out; 331 } 332 } else { 333 if (addr_type != IPV6_ADDR_ANY) { 334 struct net_device *dev = NULL; 335 336 rcu_read_lock(); 337 if (__ipv6_addr_needs_scope_id(addr_type)) { 338 if (addr_len >= sizeof(struct sockaddr_in6) && 339 addr->sin6_scope_id) { 340 /* Override any existing binding, if another one 341 * is supplied by user. 342 */ 343 sk->sk_bound_dev_if = addr->sin6_scope_id; 344 } 345 346 /* Binding to link-local address requires an interface */ 347 if (!sk->sk_bound_dev_if) { 348 err = -EINVAL; 349 goto out_unlock; 350 } 351 } 352 353 if (sk->sk_bound_dev_if) { 354 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 355 if (!dev) { 356 err = -ENODEV; 357 goto out_unlock; 358 } 359 } 360 361 /* ipv4 addr of the socket is invalid. Only the 362 * unspecified and mapped address have a v4 equivalent. 363 */ 364 v4addr = LOOPBACK4_IPV6; 365 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 366 if (!ipv6_can_nonlocal_bind(net, inet) && 367 !ipv6_chk_addr(net, &addr->sin6_addr, 368 dev, 0)) { 369 err = -EADDRNOTAVAIL; 370 goto out_unlock; 371 } 372 } 373 rcu_read_unlock(); 374 } 375 } 376 377 inet->inet_rcv_saddr = v4addr; 378 inet->inet_saddr = v4addr; 379 380 sk->sk_v6_rcv_saddr = addr->sin6_addr; 381 382 if (!(addr_type & IPV6_ADDR_MULTICAST)) 383 np->saddr = addr->sin6_addr; 384 385 saved_ipv6only = sk->sk_ipv6only; 386 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED) 387 sk->sk_ipv6only = 1; 388 389 /* Make sure we are allowed to bind here. */ 390 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) || 391 (flags & BIND_FORCE_ADDRESS_NO_PORT))) { 392 err = sk->sk_prot->get_port(sk, snum); 393 if (err) { 394 sk->sk_ipv6only = saved_ipv6only; 395 inet_reset_saddr(sk); 396 goto out; 397 } 398 if (!(flags & BIND_FROM_BPF)) { 399 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk); 400 if (err) { 401 sk->sk_ipv6only = saved_ipv6only; 402 inet_reset_saddr(sk); 403 if (sk->sk_prot->put_port) 404 sk->sk_prot->put_port(sk); 405 goto out; 406 } 407 } 408 } 409 410 if (addr_type != IPV6_ADDR_ANY) 411 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 412 if (snum) 413 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 414 inet->inet_sport = htons(inet->inet_num); 415 inet->inet_dport = 0; 416 inet->inet_daddr = 0; 417 out: 418 if (flags & BIND_WITH_LOCK) 419 release_sock(sk); 420 return err; 421 out_unlock: 422 rcu_read_unlock(); 423 goto out; 424 } 425 426 int inet6_bind_sk(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len) 427 { 428 u32 flags = BIND_WITH_LOCK; 429 const struct proto *prot; 430 int err = 0; 431 432 prot = READ_ONCE(sk->sk_prot); 433 /* If the socket has its own bind function then use it. */ 434 if (prot->bind) 435 return prot->bind(sk, uaddr, addr_len); 436 437 if (addr_len < SIN6_LEN_RFC2133) 438 return -EINVAL; 439 440 /* BPF prog is run before any checks are done so that if the prog 441 * changes context in a wrong way it will be caught. 442 */ 443 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len, 444 CGROUP_INET6_BIND, &flags); 445 if (err) 446 return err; 447 448 return __inet6_bind(sk, uaddr, addr_len, flags); 449 } 450 451 /* bind for INET6 API */ 452 int inet6_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len) 453 { 454 return inet6_bind_sk(sock->sk, uaddr, addr_len); 455 } 456 EXPORT_SYMBOL(inet6_bind); 457 458 int inet6_release(struct socket *sock) 459 { 460 struct sock *sk = sock->sk; 461 462 if (!sk) 463 return -EINVAL; 464 465 /* Free mc lists */ 466 ipv6_sock_mc_close(sk); 467 468 /* Free ac lists */ 469 ipv6_sock_ac_close(sk); 470 471 return inet_release(sock); 472 } 473 EXPORT_SYMBOL(inet6_release); 474 475 void inet6_cleanup_sock(struct sock *sk) 476 { 477 struct ipv6_pinfo *np = inet6_sk(sk); 478 struct sk_buff *skb; 479 struct ipv6_txoptions *opt; 480 481 /* Release rx options */ 482 483 skb = xchg(&np->pktoptions, NULL); 484 kfree_skb(skb); 485 486 skb = xchg(&np->rxpmtu, NULL); 487 kfree_skb(skb); 488 489 /* Free flowlabels */ 490 fl6_free_socklist(sk); 491 492 /* Free tx options */ 493 494 opt = unrcu_pointer(xchg(&np->opt, NULL)); 495 if (opt) { 496 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 497 txopt_put(opt); 498 } 499 } 500 501 /* 502 * This does both peername and sockname. 503 */ 504 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 505 int peer) 506 { 507 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 508 int sin_addr_len = sizeof(*sin); 509 struct sock *sk = sock->sk; 510 struct inet_sock *inet = inet_sk(sk); 511 struct ipv6_pinfo *np = inet6_sk(sk); 512 513 sin->sin6_family = AF_INET6; 514 sin->sin6_flowinfo = 0; 515 sin->sin6_scope_id = 0; 516 lock_sock(sk); 517 if (peer) { 518 if (!inet->inet_dport || 519 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 520 peer == 1)) { 521 release_sock(sk); 522 return -ENOTCONN; 523 } 524 sin->sin6_port = inet->inet_dport; 525 sin->sin6_addr = sk->sk_v6_daddr; 526 if (inet6_test_bit(SNDFLOW, sk)) 527 sin->sin6_flowinfo = np->flow_label; 528 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len, 529 CGROUP_INET6_GETPEERNAME); 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 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len, 537 CGROUP_INET6_GETSOCKNAME); 538 } 539 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 540 sk->sk_bound_dev_if); 541 release_sock(sk); 542 return sin_addr_len; 543 } 544 EXPORT_SYMBOL(inet6_getname); 545 546 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 547 { 548 void __user *argp = (void __user *)arg; 549 struct sock *sk = sock->sk; 550 struct net *net = sock_net(sk); 551 const struct proto *prot; 552 553 switch (cmd) { 554 case SIOCADDRT: 555 case SIOCDELRT: { 556 struct in6_rtmsg rtmsg; 557 558 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg))) 559 return -EFAULT; 560 return ipv6_route_ioctl(net, cmd, &rtmsg); 561 } 562 case SIOCSIFADDR: 563 return addrconf_add_ifaddr(net, argp); 564 case SIOCDIFADDR: 565 return addrconf_del_ifaddr(net, argp); 566 case SIOCSIFDSTADDR: 567 return addrconf_set_dstaddr(net, argp); 568 default: 569 prot = READ_ONCE(sk->sk_prot); 570 if (!prot->ioctl) 571 return -ENOIOCTLCMD; 572 return sk_ioctl(sk, cmd, (void __user *)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 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 630 { 631 struct sock *sk = sock->sk; 632 const struct proto *prot; 633 634 if (unlikely(inet_send_prepare(sk))) 635 return -EAGAIN; 636 637 prot = READ_ONCE(sk->sk_prot); 638 return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg, 639 sk, msg, size); 640 } 641 642 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 643 int flags) 644 { 645 struct sock *sk = sock->sk; 646 const struct proto *prot; 647 648 if (likely(!(flags & MSG_ERRQUEUE))) 649 sock_rps_record_flow(sk); 650 651 prot = READ_ONCE(sk->sk_prot); 652 return INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg, 653 sk, msg, size, flags); 654 } 655 656 const struct proto_ops inet6_stream_ops = { 657 .family = PF_INET6, 658 .owner = THIS_MODULE, 659 .release = inet6_release, 660 .bind = inet6_bind, 661 .connect = inet_stream_connect, /* ok */ 662 .socketpair = sock_no_socketpair, /* a do nothing */ 663 .accept = inet_accept, /* ok */ 664 .getname = inet6_getname, 665 .poll = tcp_poll, /* ok */ 666 .ioctl = inet6_ioctl, /* must change */ 667 .gettstamp = sock_gettstamp, 668 .listen = inet_listen, /* ok */ 669 .shutdown = inet_shutdown, /* ok */ 670 .setsockopt = sock_common_setsockopt, /* ok */ 671 .getsockopt = sock_common_getsockopt, /* ok */ 672 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 673 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 674 #ifdef CONFIG_MMU 675 .mmap = tcp_mmap, 676 #endif 677 .splice_eof = inet_splice_eof, 678 .sendmsg_locked = tcp_sendmsg_locked, 679 .splice_read = tcp_splice_read, 680 .set_peek_off = sk_set_peek_off, 681 .read_sock = tcp_read_sock, 682 .read_skb = tcp_read_skb, 683 .peek_len = tcp_peek_len, 684 #ifdef CONFIG_COMPAT 685 .compat_ioctl = inet6_compat_ioctl, 686 #endif 687 .set_rcvlowat = tcp_set_rcvlowat, 688 .set_rcvbuf = tcp_set_rcvbuf, 689 }; 690 EXPORT_SYMBOL_GPL(inet6_stream_ops); 691 692 const struct proto_ops inet6_dgram_ops = { 693 .family = PF_INET6, 694 .owner = THIS_MODULE, 695 .release = inet6_release, 696 .bind = inet6_bind, 697 .connect = inet_dgram_connect, /* ok */ 698 .socketpair = sock_no_socketpair, /* a do nothing */ 699 .accept = sock_no_accept, /* a do nothing */ 700 .getname = inet6_getname, 701 .poll = udp_poll, /* ok */ 702 .ioctl = inet6_ioctl, /* must change */ 703 .gettstamp = sock_gettstamp, 704 .listen = sock_no_listen, /* ok */ 705 .shutdown = inet_shutdown, /* ok */ 706 .setsockopt = sock_common_setsockopt, /* ok */ 707 .getsockopt = sock_common_getsockopt, /* ok */ 708 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 709 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 710 .read_skb = udp_read_skb, 711 .mmap = sock_no_mmap, 712 .set_peek_off = udp_set_peek_off, 713 #ifdef CONFIG_COMPAT 714 .compat_ioctl = inet6_compat_ioctl, 715 #endif 716 }; 717 718 static const struct net_proto_family inet6_family_ops = { 719 .family = PF_INET6, 720 .create = inet6_create, 721 .owner = THIS_MODULE, 722 }; 723 724 int inet6_register_protosw(struct inet_protosw *p) 725 { 726 struct list_head *lh; 727 struct inet_protosw *answer; 728 struct list_head *last_perm; 729 int protocol = p->protocol; 730 int ret; 731 732 spin_lock_bh(&inetsw6_lock); 733 734 ret = -EINVAL; 735 if (p->type >= SOCK_MAX) 736 goto out_illegal; 737 738 /* If we are trying to override a permanent protocol, bail. */ 739 answer = NULL; 740 ret = -EPERM; 741 last_perm = &inetsw6[p->type]; 742 list_for_each(lh, &inetsw6[p->type]) { 743 answer = list_entry(lh, struct inet_protosw, list); 744 745 /* Check only the non-wild match. */ 746 if (INET_PROTOSW_PERMANENT & answer->flags) { 747 if (protocol == answer->protocol) 748 break; 749 last_perm = lh; 750 } 751 752 answer = NULL; 753 } 754 if (answer) 755 goto out_permanent; 756 757 /* Add the new entry after the last permanent entry if any, so that 758 * the new entry does not override a permanent entry when matched with 759 * a wild-card protocol. But it is allowed to override any existing 760 * non-permanent entry. This means that when we remove this entry, the 761 * system automatically returns to the old behavior. 762 */ 763 list_add_rcu(&p->list, last_perm); 764 ret = 0; 765 out: 766 spin_unlock_bh(&inetsw6_lock); 767 return ret; 768 769 out_permanent: 770 pr_err("Attempt to override permanent protocol %d\n", protocol); 771 goto out; 772 773 out_illegal: 774 pr_err("Ignoring attempt to register invalid socket type %d\n", 775 p->type); 776 goto out; 777 } 778 EXPORT_SYMBOL(inet6_register_protosw); 779 780 void 781 inet6_unregister_protosw(struct inet_protosw *p) 782 { 783 if (INET_PROTOSW_PERMANENT & p->flags) { 784 pr_err("Attempt to unregister permanent protocol %d\n", 785 p->protocol); 786 } else { 787 spin_lock_bh(&inetsw6_lock); 788 list_del_rcu(&p->list); 789 spin_unlock_bh(&inetsw6_lock); 790 791 synchronize_net(); 792 } 793 } 794 EXPORT_SYMBOL(inet6_unregister_protosw); 795 796 int inet6_sk_rebuild_header(struct sock *sk) 797 { 798 struct ipv6_pinfo *np = inet6_sk(sk); 799 struct inet_sock *inet = inet_sk(sk); 800 struct in6_addr *final_p; 801 struct dst_entry *dst; 802 struct flowi6 *fl6; 803 804 dst = __sk_dst_check(sk, np->dst_cookie); 805 if (dst) 806 return 0; 807 808 fl6 = &inet->cork.fl.u.ip6; 809 memset(fl6, 0, sizeof(*fl6)); 810 fl6->flowi6_proto = sk->sk_protocol; 811 fl6->daddr = sk->sk_v6_daddr; 812 fl6->saddr = np->saddr; 813 fl6->flowlabel = np->flow_label; 814 fl6->flowi6_oif = sk->sk_bound_dev_if; 815 fl6->flowi6_mark = sk->sk_mark; 816 fl6->fl6_dport = inet->inet_dport; 817 fl6->fl6_sport = inet->inet_sport; 818 fl6->flowi6_uid = sk_uid(sk); 819 security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); 820 821 ip6_ecmp_set_mp_hash(sock_net(sk), fl6, sk->sk_txhash); 822 823 rcu_read_lock(); 824 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &np->final); 825 rcu_read_unlock(); 826 827 dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p); 828 if (IS_ERR(dst)) { 829 sk->sk_route_caps = 0; 830 WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst)); 831 return PTR_ERR(dst); 832 } 833 834 ip6_dst_store(sk, dst, false, false); 835 return 0; 836 } 837 838 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 839 const struct inet6_skb_parm *opt) 840 { 841 const struct ipv6_pinfo *np = inet6_sk(sk); 842 843 if (np->rxopt.all) { 844 if (((opt->flags & IP6SKB_HOPBYHOP) && 845 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 846 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 847 np->rxopt.bits.rxflow) || 848 (opt->srcrt && (np->rxopt.bits.srcrt || 849 np->rxopt.bits.osrcrt)) || 850 ((opt->dst1 || opt->dst0) && 851 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 852 return true; 853 } 854 return false; 855 } 856 857 static struct packet_type ipv6_packet_type __read_mostly = { 858 .type = cpu_to_be16(ETH_P_IPV6), 859 .func = ipv6_rcv, 860 .list_func = ipv6_list_rcv, 861 }; 862 863 static int __init ipv6_packet_init(void) 864 { 865 dev_add_pack(&ipv6_packet_type); 866 return 0; 867 } 868 869 static void ipv6_packet_cleanup(void) 870 { 871 dev_remove_pack(&ipv6_packet_type); 872 } 873 874 static int __net_init ipv6_init_mibs(struct net *net) 875 { 876 int i; 877 878 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 879 if (!net->mib.udp_stats_in6) 880 return -ENOMEM; 881 882 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 883 if (!net->mib.ipv6_statistics) 884 goto err_ip_mib; 885 886 for_each_possible_cpu(i) { 887 struct ipstats_mib *af_inet6_stats; 888 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 889 u64_stats_init(&af_inet6_stats->syncp); 890 } 891 892 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 893 if (!net->mib.icmpv6_statistics) 894 goto err_icmp_mib; 895 896 net->mib.icmpv6msg_statistics = kzalloc_obj(struct icmpv6msg_mib); 897 if (!net->mib.icmpv6msg_statistics) 898 goto err_icmpmsg_mib; 899 return 0; 900 901 err_icmpmsg_mib: 902 free_percpu(net->mib.icmpv6_statistics); 903 err_icmp_mib: 904 free_percpu(net->mib.ipv6_statistics); 905 err_ip_mib: 906 free_percpu(net->mib.udp_stats_in6); 907 return -ENOMEM; 908 } 909 910 static void ipv6_cleanup_mibs(struct net *net) 911 { 912 free_percpu(net->mib.udp_stats_in6); 913 free_percpu(net->mib.ipv6_statistics); 914 free_percpu(net->mib.icmpv6_statistics); 915 kfree(net->mib.icmpv6msg_statistics); 916 } 917 918 static int __net_init inet6_net_init(struct net *net) 919 { 920 int err = 0; 921 922 net->ipv6.sysctl.bindv6only = 0; 923 net->ipv6.sysctl.icmpv6_time = HZ / 10; 924 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0; 925 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0; 926 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0; 927 net->ipv6.sysctl.icmpv6_error_anycast_as_unicast = 0; 928 net->ipv6.sysctl.icmpv6_errors_extension_mask = 0; 929 930 /* By default, rate limit error messages. 931 * Except for pmtu discovery, it would break it. 932 * proc_do_large_bitmap needs pointer to the bitmap. 933 */ 934 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1); 935 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1); 936 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask; 937 938 net->ipv6.sysctl.flowlabel_consistency = 1; 939 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 940 net->ipv6.sysctl.idgen_retries = 3; 941 net->ipv6.sysctl.idgen_delay = 1 * HZ; 942 net->ipv6.sysctl.flowlabel_state_ranges = 0; 943 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 944 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 945 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 946 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 947 net->ipv6.sysctl.fib_notify_on_flag_change = 0; 948 atomic_set(&net->ipv6.fib6_sernum, 1); 949 950 net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID; 951 net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE; 952 953 err = ipv6_init_mibs(net); 954 if (err) 955 return err; 956 #ifdef CONFIG_PROC_FS 957 err = udp6_proc_init(net); 958 if (err) 959 goto out; 960 err = tcp6_proc_init(net); 961 if (err) 962 goto proc_tcp6_fail; 963 err = ac6_proc_init(net); 964 if (err) 965 goto proc_ac6_fail; 966 #endif 967 return err; 968 969 #ifdef CONFIG_PROC_FS 970 proc_ac6_fail: 971 tcp6_proc_exit(net); 972 proc_tcp6_fail: 973 udp6_proc_exit(net); 974 out: 975 ipv6_cleanup_mibs(net); 976 return err; 977 #endif 978 } 979 980 static void __net_exit inet6_net_exit(struct net *net) 981 { 982 #ifdef CONFIG_PROC_FS 983 udp6_proc_exit(net); 984 tcp6_proc_exit(net); 985 ac6_proc_exit(net); 986 #endif 987 ipv6_cleanup_mibs(net); 988 } 989 990 static struct pernet_operations inet6_net_ops = { 991 .init = inet6_net_init, 992 .exit = inet6_net_exit, 993 }; 994 995 static int __init inet6_init(void) 996 { 997 struct list_head *r; 998 int err = 0; 999 1000 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 1001 1002 /* Register the socket-side information for inet6_create. */ 1003 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 1004 INIT_LIST_HEAD(r); 1005 1006 raw_hashinfo_init(&raw_v6_hashinfo); 1007 1008 if (disable_ipv6_mod) { 1009 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 1010 goto out; 1011 } 1012 1013 err = proto_register(&tcpv6_prot, 1); 1014 if (err) 1015 goto out; 1016 1017 err = proto_register(&udpv6_prot, 1); 1018 if (err) 1019 goto out_unregister_tcp_proto; 1020 1021 err = proto_register(&rawv6_prot, 1); 1022 if (err) 1023 goto out_unregister_udp_proto; 1024 1025 err = proto_register(&pingv6_prot, 1); 1026 if (err) 1027 goto out_unregister_raw_proto; 1028 1029 /* We MUST register RAW sockets before we create the ICMP6, 1030 * IGMP6, or NDISC control sockets. 1031 */ 1032 err = rawv6_init(); 1033 if (err) 1034 goto out_unregister_ping_proto; 1035 1036 /* Register the family here so that the init calls below will 1037 * be able to create sockets. (?? is this dangerous ??) 1038 */ 1039 err = sock_register(&inet6_family_ops); 1040 if (err) 1041 goto out_sock_register_fail; 1042 1043 /* 1044 * ipngwg API draft makes clear that the correct semantics 1045 * for TCP and UDP is to consider one TCP and UDP instance 1046 * in a host available by both INET and INET6 APIs and 1047 * able to communicate via both network protocols. 1048 */ 1049 1050 err = register_pernet_subsys(&inet6_net_ops); 1051 if (err) 1052 goto register_pernet_fail; 1053 err = ip6_mr_init(); 1054 if (err) 1055 goto ipmr_fail; 1056 err = icmpv6_init(); 1057 if (err) 1058 goto icmp_fail; 1059 err = ndisc_init(); 1060 if (err) 1061 goto ndisc_fail; 1062 err = igmp6_init(); 1063 if (err) 1064 goto igmp_fail; 1065 1066 /* Create /proc/foo6 entries. */ 1067 #ifdef CONFIG_PROC_FS 1068 err = -ENOMEM; 1069 if (raw6_proc_init()) 1070 goto proc_raw6_fail; 1071 if (ipv6_misc_proc_init()) 1072 goto proc_misc6_fail; 1073 if (if6_proc_init()) 1074 goto proc_if6_fail; 1075 #endif 1076 err = ip6_route_init(); 1077 if (err) 1078 goto ip6_route_fail; 1079 err = ndisc_late_init(); 1080 if (err) 1081 goto ndisc_late_fail; 1082 err = ip6_flowlabel_init(); 1083 if (err) 1084 goto ip6_flowlabel_fail; 1085 err = ipv6_anycast_init(); 1086 if (err) 1087 goto ipv6_anycast_fail; 1088 err = addrconf_init(); 1089 if (err) 1090 goto addrconf_fail; 1091 1092 /* Init v6 extension headers. */ 1093 err = ipv6_exthdrs_init(); 1094 if (err) 1095 goto ipv6_exthdrs_fail; 1096 1097 err = ipv6_frag_init(); 1098 if (err) 1099 goto ipv6_frag_fail; 1100 1101 /* Init v6 transport protocols. */ 1102 err = udpv6_init(); 1103 if (err) 1104 goto udpv6_fail; 1105 1106 err = udpv6_offload_init(); 1107 if (err) 1108 goto udpv6_offload_fail; 1109 1110 err = tcpv6_init(); 1111 if (err) 1112 goto tcpv6_fail; 1113 1114 err = ipv6_packet_init(); 1115 if (err) 1116 goto ipv6_packet_fail; 1117 1118 err = pingv6_init(); 1119 if (err) 1120 goto pingv6_fail; 1121 1122 err = calipso_init(); 1123 if (err) 1124 goto calipso_fail; 1125 1126 err = seg6_init(); 1127 if (err) 1128 goto seg6_fail; 1129 1130 err = rpl_init(); 1131 if (err) 1132 goto rpl_fail; 1133 1134 err = ioam6_init(); 1135 if (err) 1136 goto ioam6_fail; 1137 1138 err = igmp6_late_init(); 1139 if (err) 1140 goto igmp6_late_err; 1141 1142 #ifdef CONFIG_SYSCTL 1143 err = ipv6_sysctl_register(); 1144 if (err) 1145 goto sysctl_fail; 1146 #endif 1147 1148 out: 1149 return err; 1150 1151 #ifdef CONFIG_SYSCTL 1152 sysctl_fail: 1153 igmp6_late_cleanup(); 1154 #endif 1155 igmp6_late_err: 1156 ioam6_exit(); 1157 ioam6_fail: 1158 rpl_exit(); 1159 rpl_fail: 1160 seg6_exit(); 1161 seg6_fail: 1162 calipso_exit(); 1163 calipso_fail: 1164 pingv6_exit(); 1165 pingv6_fail: 1166 ipv6_packet_cleanup(); 1167 ipv6_packet_fail: 1168 tcpv6_exit(); 1169 tcpv6_fail: 1170 udpv6_offload_exit(); 1171 udpv6_offload_fail: 1172 udpv6_exit(); 1173 udpv6_fail: 1174 ipv6_frag_exit(); 1175 ipv6_frag_fail: 1176 ipv6_exthdrs_exit(); 1177 ipv6_exthdrs_fail: 1178 addrconf_cleanup(); 1179 addrconf_fail: 1180 ipv6_anycast_cleanup(); 1181 ipv6_anycast_fail: 1182 ip6_flowlabel_cleanup(); 1183 ip6_flowlabel_fail: 1184 ndisc_late_cleanup(); 1185 ndisc_late_fail: 1186 ip6_route_cleanup(); 1187 ip6_route_fail: 1188 #ifdef CONFIG_PROC_FS 1189 if6_proc_exit(); 1190 proc_if6_fail: 1191 ipv6_misc_proc_exit(); 1192 proc_misc6_fail: 1193 raw6_proc_exit(); 1194 proc_raw6_fail: 1195 #endif 1196 igmp6_cleanup(); 1197 igmp_fail: 1198 ndisc_cleanup(); 1199 ndisc_fail: 1200 icmpv6_cleanup(); 1201 icmp_fail: 1202 ip6_mr_cleanup(); 1203 ipmr_fail: 1204 unregister_pernet_subsys(&inet6_net_ops); 1205 register_pernet_fail: 1206 sock_unregister(PF_INET6); 1207 rtnl_unregister_all(PF_INET6); 1208 out_sock_register_fail: 1209 rawv6_exit(); 1210 out_unregister_ping_proto: 1211 proto_unregister(&pingv6_prot); 1212 out_unregister_raw_proto: 1213 proto_unregister(&rawv6_prot); 1214 out_unregister_udp_proto: 1215 proto_unregister(&udpv6_prot); 1216 out_unregister_tcp_proto: 1217 proto_unregister(&tcpv6_prot); 1218 goto out; 1219 } 1220 fs_initcall_sync(inet6_init); 1221