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 63 #include <linux/uaccess.h> 64 #include <linux/mroute6.h> 65 66 #include "ip6_offload.h" 67 68 MODULE_AUTHOR("Cast of dozens"); 69 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 70 MODULE_LICENSE("GPL"); 71 72 /* The inetsw6 table contains everything that inet6_create needs to 73 * build a new socket. 74 */ 75 static struct list_head inetsw6[SOCK_MAX]; 76 static DEFINE_SPINLOCK(inetsw6_lock); 77 78 struct ipv6_params ipv6_defaults = { 79 .disable_ipv6 = 0, 80 .autoconf = 1, 81 }; 82 83 static int disable_ipv6_mod; 84 85 module_param_named(disable, disable_ipv6_mod, int, 0444); 86 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 87 88 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 89 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 90 91 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 92 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 93 94 bool ipv6_mod_enabled(void) 95 { 96 return disable_ipv6_mod == 0; 97 } 98 EXPORT_SYMBOL_GPL(ipv6_mod_enabled); 99 100 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 101 { 102 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 103 104 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 105 } 106 107 static int inet6_create(struct net *net, struct socket *sock, int protocol, 108 int kern) 109 { 110 struct inet_sock *inet; 111 struct ipv6_pinfo *np; 112 struct sock *sk; 113 struct inet_protosw *answer; 114 struct proto *answer_prot; 115 unsigned char answer_flags; 116 int try_loading_module = 0; 117 int err; 118 119 if (protocol < 0 || protocol >= IPPROTO_MAX) 120 return -EINVAL; 121 122 /* Look for the requested type/protocol pair. */ 123 lookup_protocol: 124 err = -ESOCKTNOSUPPORT; 125 rcu_read_lock(); 126 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 127 128 err = 0; 129 /* Check the non-wild match. */ 130 if (protocol == answer->protocol) { 131 if (protocol != IPPROTO_IP) 132 break; 133 } else { 134 /* Check for the two wild cases. */ 135 if (IPPROTO_IP == protocol) { 136 protocol = answer->protocol; 137 break; 138 } 139 if (IPPROTO_IP == answer->protocol) 140 break; 141 } 142 err = -EPROTONOSUPPORT; 143 } 144 145 if (err) { 146 if (try_loading_module < 2) { 147 rcu_read_unlock(); 148 /* 149 * Be more specific, e.g. net-pf-10-proto-132-type-1 150 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 151 */ 152 if (++try_loading_module == 1) 153 request_module("net-pf-%d-proto-%d-type-%d", 154 PF_INET6, protocol, sock->type); 155 /* 156 * Fall back to generic, e.g. net-pf-10-proto-132 157 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 158 */ 159 else 160 request_module("net-pf-%d-proto-%d", 161 PF_INET6, protocol); 162 goto lookup_protocol; 163 } else 164 goto out_rcu_unlock; 165 } 166 167 err = -EPERM; 168 if (sock->type == SOCK_RAW && !kern && 169 !ns_capable(net->user_ns, CAP_NET_RAW)) 170 goto out_rcu_unlock; 171 172 sock->ops = answer->ops; 173 answer_prot = answer->prot; 174 answer_flags = answer->flags; 175 rcu_read_unlock(); 176 177 WARN_ON(!answer_prot->slab); 178 179 err = -ENOBUFS; 180 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 181 if (!sk) 182 goto out; 183 184 sock_init_data(sock, sk); 185 186 err = 0; 187 if (INET_PROTOSW_REUSE & answer_flags) 188 sk->sk_reuse = SK_CAN_REUSE; 189 190 inet = inet_sk(sk); 191 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 192 193 if (SOCK_RAW == sock->type) { 194 inet->inet_num = protocol; 195 if (IPPROTO_RAW == protocol) 196 inet->hdrincl = 1; 197 } 198 199 sk->sk_destruct = inet_sock_destruct; 200 sk->sk_family = PF_INET6; 201 sk->sk_protocol = protocol; 202 203 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 204 205 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 206 np->hop_limit = -1; 207 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 208 np->mc_loop = 1; 209 np->mc_all = 1; 210 np->pmtudisc = IPV6_PMTUDISC_WANT; 211 np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED; 212 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 213 214 /* Init the ipv4 part of the socket since we can have sockets 215 * using v6 API for ipv4. 216 */ 217 inet->uc_ttl = -1; 218 219 inet->mc_loop = 1; 220 inet->mc_ttl = 1; 221 inet->mc_index = 0; 222 inet->mc_list = NULL; 223 inet->rcv_tos = 0; 224 225 if (net->ipv4.sysctl_ip_no_pmtu_disc) 226 inet->pmtudisc = IP_PMTUDISC_DONT; 227 else 228 inet->pmtudisc = IP_PMTUDISC_WANT; 229 /* 230 * Increment only the relevant sk_prot->socks debug field, this changes 231 * the previous behaviour of incrementing both the equivalent to 232 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 233 * 234 * This allows better debug granularity as we'll know exactly how many 235 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 236 * transport protocol socks. -acme 237 */ 238 sk_refcnt_debug_inc(sk); 239 240 if (inet->inet_num) { 241 /* It assumes that any protocol which allows 242 * the user to assign a number at socket 243 * creation time automatically shares. 244 */ 245 inet->inet_sport = htons(inet->inet_num); 246 err = sk->sk_prot->hash(sk); 247 if (err) { 248 sk_common_release(sk); 249 goto out; 250 } 251 } 252 if (sk->sk_prot->init) { 253 err = sk->sk_prot->init(sk); 254 if (err) { 255 sk_common_release(sk); 256 goto out; 257 } 258 } 259 260 if (!kern) { 261 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 262 if (err) { 263 sk_common_release(sk); 264 goto out; 265 } 266 } 267 out: 268 return err; 269 out_rcu_unlock: 270 rcu_read_unlock(); 271 goto out; 272 } 273 274 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 275 bool force_bind_address_no_port, bool with_lock) 276 { 277 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 278 struct inet_sock *inet = inet_sk(sk); 279 struct ipv6_pinfo *np = inet6_sk(sk); 280 struct net *net = sock_net(sk); 281 __be32 v4addr = 0; 282 unsigned short snum; 283 bool saved_ipv6only; 284 int addr_type = 0; 285 int err = 0; 286 287 if (addr->sin6_family != AF_INET6) 288 return -EAFNOSUPPORT; 289 290 addr_type = ipv6_addr_type(&addr->sin6_addr); 291 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM) 292 return -EINVAL; 293 294 snum = ntohs(addr->sin6_port); 295 if (snum && snum < inet_prot_sock(net) && 296 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 297 return -EACCES; 298 299 if (with_lock) 300 lock_sock(sk); 301 302 /* Check these errors (active socket, double bind). */ 303 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 304 err = -EINVAL; 305 goto out; 306 } 307 308 /* Check if the address belongs to the host. */ 309 if (addr_type == IPV6_ADDR_MAPPED) { 310 struct net_device *dev = NULL; 311 int chk_addr_ret; 312 313 /* Binding to v4-mapped address on a v6-only socket 314 * makes no sense 315 */ 316 if (sk->sk_ipv6only) { 317 err = -EINVAL; 318 goto out; 319 } 320 321 rcu_read_lock(); 322 if (sk->sk_bound_dev_if) { 323 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 324 if (!dev) { 325 err = -ENODEV; 326 goto out_unlock; 327 } 328 } 329 330 /* Reproduce AF_INET checks to make the bindings consistent */ 331 v4addr = addr->sin6_addr.s6_addr32[3]; 332 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr); 333 rcu_read_unlock(); 334 335 if (!inet_can_nonlocal_bind(net, inet) && 336 v4addr != htonl(INADDR_ANY) && 337 chk_addr_ret != RTN_LOCAL && 338 chk_addr_ret != RTN_MULTICAST && 339 chk_addr_ret != RTN_BROADCAST) { 340 err = -EADDRNOTAVAIL; 341 goto out; 342 } 343 } else { 344 if (addr_type != IPV6_ADDR_ANY) { 345 struct net_device *dev = NULL; 346 347 rcu_read_lock(); 348 if (__ipv6_addr_needs_scope_id(addr_type)) { 349 if (addr_len >= sizeof(struct sockaddr_in6) && 350 addr->sin6_scope_id) { 351 /* Override any existing binding, if another one 352 * is supplied by user. 353 */ 354 sk->sk_bound_dev_if = addr->sin6_scope_id; 355 } 356 357 /* Binding to link-local address requires an interface */ 358 if (!sk->sk_bound_dev_if) { 359 err = -EINVAL; 360 goto out_unlock; 361 } 362 } 363 364 if (sk->sk_bound_dev_if) { 365 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 366 if (!dev) { 367 err = -ENODEV; 368 goto out_unlock; 369 } 370 } 371 372 /* ipv4 addr of the socket is invalid. Only the 373 * unspecified and mapped address have a v4 equivalent. 374 */ 375 v4addr = LOOPBACK4_IPV6; 376 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 377 if (!ipv6_can_nonlocal_bind(net, inet) && 378 !ipv6_chk_addr(net, &addr->sin6_addr, 379 dev, 0)) { 380 err = -EADDRNOTAVAIL; 381 goto out_unlock; 382 } 383 } 384 rcu_read_unlock(); 385 } 386 } 387 388 inet->inet_rcv_saddr = v4addr; 389 inet->inet_saddr = v4addr; 390 391 sk->sk_v6_rcv_saddr = addr->sin6_addr; 392 393 if (!(addr_type & IPV6_ADDR_MULTICAST)) 394 np->saddr = addr->sin6_addr; 395 396 saved_ipv6only = sk->sk_ipv6only; 397 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED) 398 sk->sk_ipv6only = 1; 399 400 /* Make sure we are allowed to bind here. */ 401 if (snum || !(inet->bind_address_no_port || 402 force_bind_address_no_port)) { 403 if (sk->sk_prot->get_port(sk, snum)) { 404 sk->sk_ipv6only = saved_ipv6only; 405 inet_reset_saddr(sk); 406 err = -EADDRINUSE; 407 goto out; 408 } 409 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk); 410 if (err) { 411 sk->sk_ipv6only = saved_ipv6only; 412 inet_reset_saddr(sk); 413 goto out; 414 } 415 } 416 417 if (addr_type != IPV6_ADDR_ANY) 418 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 419 if (snum) 420 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 421 inet->inet_sport = htons(inet->inet_num); 422 inet->inet_dport = 0; 423 inet->inet_daddr = 0; 424 out: 425 if (with_lock) 426 release_sock(sk); 427 return err; 428 out_unlock: 429 rcu_read_unlock(); 430 goto out; 431 } 432 433 /* bind for INET6 API */ 434 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 435 { 436 struct sock *sk = sock->sk; 437 int err = 0; 438 439 /* If the socket has its own bind function then use it. */ 440 if (sk->sk_prot->bind) 441 return sk->sk_prot->bind(sk, uaddr, addr_len); 442 443 if (addr_len < SIN6_LEN_RFC2133) 444 return -EINVAL; 445 446 /* BPF prog is run before any checks are done so that if the prog 447 * changes context in a wrong way it will be caught. 448 */ 449 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr); 450 if (err) 451 return err; 452 453 return __inet6_bind(sk, uaddr, addr_len, false, true); 454 } 455 EXPORT_SYMBOL(inet6_bind); 456 457 int inet6_release(struct socket *sock) 458 { 459 struct sock *sk = sock->sk; 460 461 if (!sk) 462 return -EINVAL; 463 464 /* Free mc lists */ 465 ipv6_sock_mc_close(sk); 466 467 /* Free ac lists */ 468 ipv6_sock_ac_close(sk); 469 470 return inet_release(sock); 471 } 472 EXPORT_SYMBOL(inet6_release); 473 474 void inet6_destroy_sock(struct sock *sk) 475 { 476 struct ipv6_pinfo *np = inet6_sk(sk); 477 struct sk_buff *skb; 478 struct ipv6_txoptions *opt; 479 480 /* Release rx options */ 481 482 skb = xchg(&np->pktoptions, NULL); 483 kfree_skb(skb); 484 485 skb = xchg(&np->rxpmtu, NULL); 486 kfree_skb(skb); 487 488 /* Free flowlabels */ 489 fl6_free_socklist(sk); 490 491 /* Free tx options */ 492 493 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 494 if (opt) { 495 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 496 txopt_put(opt); 497 } 498 } 499 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 500 501 /* 502 * This does both peername and sockname. 503 */ 504 505 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 506 int peer) 507 { 508 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 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 if (peer) { 517 if (!inet->inet_dport) 518 return -ENOTCONN; 519 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 520 peer == 1) 521 return -ENOTCONN; 522 sin->sin6_port = inet->inet_dport; 523 sin->sin6_addr = sk->sk_v6_daddr; 524 if (np->sndflow) 525 sin->sin6_flowinfo = np->flow_label; 526 } else { 527 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 528 sin->sin6_addr = np->saddr; 529 else 530 sin->sin6_addr = sk->sk_v6_rcv_saddr; 531 532 sin->sin6_port = inet->inet_sport; 533 } 534 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 535 sk->sk_bound_dev_if); 536 return sizeof(*sin); 537 } 538 EXPORT_SYMBOL(inet6_getname); 539 540 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 541 { 542 struct sock *sk = sock->sk; 543 struct net *net = sock_net(sk); 544 545 switch (cmd) { 546 case SIOCADDRT: 547 case SIOCDELRT: 548 549 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 550 551 case SIOCSIFADDR: 552 return addrconf_add_ifaddr(net, (void __user *) arg); 553 case SIOCDIFADDR: 554 return addrconf_del_ifaddr(net, (void __user *) arg); 555 case SIOCSIFDSTADDR: 556 return addrconf_set_dstaddr(net, (void __user *) arg); 557 default: 558 if (!sk->sk_prot->ioctl) 559 return -ENOIOCTLCMD; 560 return sk->sk_prot->ioctl(sk, cmd, arg); 561 } 562 /*NOTREACHED*/ 563 return 0; 564 } 565 EXPORT_SYMBOL(inet6_ioctl); 566 567 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *, 568 size_t)); 569 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 570 { 571 struct sock *sk = sock->sk; 572 573 if (unlikely(inet_send_prepare(sk))) 574 return -EAGAIN; 575 576 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udpv6_sendmsg, 577 sk, msg, size); 578 } 579 580 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *, 581 size_t, int, int, int *)); 582 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 583 int flags) 584 { 585 struct sock *sk = sock->sk; 586 int addr_len = 0; 587 int err; 588 589 if (likely(!(flags & MSG_ERRQUEUE))) 590 sock_rps_record_flow(sk); 591 592 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udpv6_recvmsg, 593 sk, msg, size, flags & MSG_DONTWAIT, 594 flags & ~MSG_DONTWAIT, &addr_len); 595 if (err >= 0) 596 msg->msg_namelen = addr_len; 597 return err; 598 } 599 600 const struct proto_ops inet6_stream_ops = { 601 .family = PF_INET6, 602 .owner = THIS_MODULE, 603 .release = inet6_release, 604 .bind = inet6_bind, 605 .connect = inet_stream_connect, /* ok */ 606 .socketpair = sock_no_socketpair, /* a do nothing */ 607 .accept = inet_accept, /* ok */ 608 .getname = inet6_getname, 609 .poll = tcp_poll, /* ok */ 610 .ioctl = inet6_ioctl, /* must change */ 611 .gettstamp = sock_gettstamp, 612 .listen = inet_listen, /* ok */ 613 .shutdown = inet_shutdown, /* ok */ 614 .setsockopt = sock_common_setsockopt, /* ok */ 615 .getsockopt = sock_common_getsockopt, /* ok */ 616 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 617 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 618 #ifdef CONFIG_MMU 619 .mmap = tcp_mmap, 620 #endif 621 .sendpage = inet_sendpage, 622 .sendmsg_locked = tcp_sendmsg_locked, 623 .sendpage_locked = tcp_sendpage_locked, 624 .splice_read = tcp_splice_read, 625 .read_sock = tcp_read_sock, 626 .peek_len = tcp_peek_len, 627 #ifdef CONFIG_COMPAT 628 .compat_setsockopt = compat_sock_common_setsockopt, 629 .compat_getsockopt = compat_sock_common_getsockopt, 630 #endif 631 .set_rcvlowat = tcp_set_rcvlowat, 632 }; 633 634 const struct proto_ops inet6_dgram_ops = { 635 .family = PF_INET6, 636 .owner = THIS_MODULE, 637 .release = inet6_release, 638 .bind = inet6_bind, 639 .connect = inet_dgram_connect, /* ok */ 640 .socketpair = sock_no_socketpair, /* a do nothing */ 641 .accept = sock_no_accept, /* a do nothing */ 642 .getname = inet6_getname, 643 .poll = udp_poll, /* ok */ 644 .ioctl = inet6_ioctl, /* must change */ 645 .gettstamp = sock_gettstamp, 646 .listen = sock_no_listen, /* ok */ 647 .shutdown = inet_shutdown, /* ok */ 648 .setsockopt = sock_common_setsockopt, /* ok */ 649 .getsockopt = sock_common_getsockopt, /* ok */ 650 .sendmsg = inet6_sendmsg, /* retpoline's sake */ 651 .recvmsg = inet6_recvmsg, /* retpoline's sake */ 652 .mmap = sock_no_mmap, 653 .sendpage = sock_no_sendpage, 654 .set_peek_off = sk_set_peek_off, 655 #ifdef CONFIG_COMPAT 656 .compat_setsockopt = compat_sock_common_setsockopt, 657 .compat_getsockopt = compat_sock_common_getsockopt, 658 #endif 659 }; 660 661 static const struct net_proto_family inet6_family_ops = { 662 .family = PF_INET6, 663 .create = inet6_create, 664 .owner = THIS_MODULE, 665 }; 666 667 int inet6_register_protosw(struct inet_protosw *p) 668 { 669 struct list_head *lh; 670 struct inet_protosw *answer; 671 struct list_head *last_perm; 672 int protocol = p->protocol; 673 int ret; 674 675 spin_lock_bh(&inetsw6_lock); 676 677 ret = -EINVAL; 678 if (p->type >= SOCK_MAX) 679 goto out_illegal; 680 681 /* If we are trying to override a permanent protocol, bail. */ 682 answer = NULL; 683 ret = -EPERM; 684 last_perm = &inetsw6[p->type]; 685 list_for_each(lh, &inetsw6[p->type]) { 686 answer = list_entry(lh, struct inet_protosw, list); 687 688 /* Check only the non-wild match. */ 689 if (INET_PROTOSW_PERMANENT & answer->flags) { 690 if (protocol == answer->protocol) 691 break; 692 last_perm = lh; 693 } 694 695 answer = NULL; 696 } 697 if (answer) 698 goto out_permanent; 699 700 /* Add the new entry after the last permanent entry if any, so that 701 * the new entry does not override a permanent entry when matched with 702 * a wild-card protocol. But it is allowed to override any existing 703 * non-permanent entry. This means that when we remove this entry, the 704 * system automatically returns to the old behavior. 705 */ 706 list_add_rcu(&p->list, last_perm); 707 ret = 0; 708 out: 709 spin_unlock_bh(&inetsw6_lock); 710 return ret; 711 712 out_permanent: 713 pr_err("Attempt to override permanent protocol %d\n", protocol); 714 goto out; 715 716 out_illegal: 717 pr_err("Ignoring attempt to register invalid socket type %d\n", 718 p->type); 719 goto out; 720 } 721 EXPORT_SYMBOL(inet6_register_protosw); 722 723 void 724 inet6_unregister_protosw(struct inet_protosw *p) 725 { 726 if (INET_PROTOSW_PERMANENT & p->flags) { 727 pr_err("Attempt to unregister permanent protocol %d\n", 728 p->protocol); 729 } else { 730 spin_lock_bh(&inetsw6_lock); 731 list_del_rcu(&p->list); 732 spin_unlock_bh(&inetsw6_lock); 733 734 synchronize_net(); 735 } 736 } 737 EXPORT_SYMBOL(inet6_unregister_protosw); 738 739 int inet6_sk_rebuild_header(struct sock *sk) 740 { 741 struct ipv6_pinfo *np = inet6_sk(sk); 742 struct dst_entry *dst; 743 744 dst = __sk_dst_check(sk, np->dst_cookie); 745 746 if (!dst) { 747 struct inet_sock *inet = inet_sk(sk); 748 struct in6_addr *final_p, final; 749 struct flowi6 fl6; 750 751 memset(&fl6, 0, sizeof(fl6)); 752 fl6.flowi6_proto = sk->sk_protocol; 753 fl6.daddr = sk->sk_v6_daddr; 754 fl6.saddr = np->saddr; 755 fl6.flowlabel = np->flow_label; 756 fl6.flowi6_oif = sk->sk_bound_dev_if; 757 fl6.flowi6_mark = sk->sk_mark; 758 fl6.fl6_dport = inet->inet_dport; 759 fl6.fl6_sport = inet->inet_sport; 760 fl6.flowi6_uid = sk->sk_uid; 761 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 762 763 rcu_read_lock(); 764 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 765 &final); 766 rcu_read_unlock(); 767 768 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 769 if (IS_ERR(dst)) { 770 sk->sk_route_caps = 0; 771 sk->sk_err_soft = -PTR_ERR(dst); 772 return PTR_ERR(dst); 773 } 774 775 ip6_dst_store(sk, dst, NULL, NULL); 776 } 777 778 return 0; 779 } 780 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 781 782 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 783 const struct inet6_skb_parm *opt) 784 { 785 const struct ipv6_pinfo *np = inet6_sk(sk); 786 787 if (np->rxopt.all) { 788 if (((opt->flags & IP6SKB_HOPBYHOP) && 789 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 790 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 791 np->rxopt.bits.rxflow) || 792 (opt->srcrt && (np->rxopt.bits.srcrt || 793 np->rxopt.bits.osrcrt)) || 794 ((opt->dst1 || opt->dst0) && 795 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 796 return true; 797 } 798 return false; 799 } 800 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 801 802 static struct packet_type ipv6_packet_type __read_mostly = { 803 .type = cpu_to_be16(ETH_P_IPV6), 804 .func = ipv6_rcv, 805 .list_func = ipv6_list_rcv, 806 }; 807 808 static int __init ipv6_packet_init(void) 809 { 810 dev_add_pack(&ipv6_packet_type); 811 return 0; 812 } 813 814 static void ipv6_packet_cleanup(void) 815 { 816 dev_remove_pack(&ipv6_packet_type); 817 } 818 819 static int __net_init ipv6_init_mibs(struct net *net) 820 { 821 int i; 822 823 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 824 if (!net->mib.udp_stats_in6) 825 return -ENOMEM; 826 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 827 if (!net->mib.udplite_stats_in6) 828 goto err_udplite_mib; 829 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 830 if (!net->mib.ipv6_statistics) 831 goto err_ip_mib; 832 833 for_each_possible_cpu(i) { 834 struct ipstats_mib *af_inet6_stats; 835 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 836 u64_stats_init(&af_inet6_stats->syncp); 837 } 838 839 840 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 841 if (!net->mib.icmpv6_statistics) 842 goto err_icmp_mib; 843 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 844 GFP_KERNEL); 845 if (!net->mib.icmpv6msg_statistics) 846 goto err_icmpmsg_mib; 847 return 0; 848 849 err_icmpmsg_mib: 850 free_percpu(net->mib.icmpv6_statistics); 851 err_icmp_mib: 852 free_percpu(net->mib.ipv6_statistics); 853 err_ip_mib: 854 free_percpu(net->mib.udplite_stats_in6); 855 err_udplite_mib: 856 free_percpu(net->mib.udp_stats_in6); 857 return -ENOMEM; 858 } 859 860 static void ipv6_cleanup_mibs(struct net *net) 861 { 862 free_percpu(net->mib.udp_stats_in6); 863 free_percpu(net->mib.udplite_stats_in6); 864 free_percpu(net->mib.ipv6_statistics); 865 free_percpu(net->mib.icmpv6_statistics); 866 kfree(net->mib.icmpv6msg_statistics); 867 } 868 869 static int __net_init inet6_net_init(struct net *net) 870 { 871 int err = 0; 872 873 net->ipv6.sysctl.bindv6only = 0; 874 net->ipv6.sysctl.icmpv6_time = 1*HZ; 875 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0; 876 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0; 877 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0; 878 879 /* By default, rate limit error messages. 880 * Except for pmtu discovery, it would break it. 881 * proc_do_large_bitmap needs pointer to the bitmap. 882 */ 883 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1); 884 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1); 885 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask; 886 887 net->ipv6.sysctl.flowlabel_consistency = 1; 888 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 889 net->ipv6.sysctl.idgen_retries = 3; 890 net->ipv6.sysctl.idgen_delay = 1 * HZ; 891 net->ipv6.sysctl.flowlabel_state_ranges = 0; 892 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 893 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 894 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 895 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 896 atomic_set(&net->ipv6.fib6_sernum, 1); 897 898 err = ipv6_init_mibs(net); 899 if (err) 900 return err; 901 #ifdef CONFIG_PROC_FS 902 err = udp6_proc_init(net); 903 if (err) 904 goto out; 905 err = tcp6_proc_init(net); 906 if (err) 907 goto proc_tcp6_fail; 908 err = ac6_proc_init(net); 909 if (err) 910 goto proc_ac6_fail; 911 #endif 912 return err; 913 914 #ifdef CONFIG_PROC_FS 915 proc_ac6_fail: 916 tcp6_proc_exit(net); 917 proc_tcp6_fail: 918 udp6_proc_exit(net); 919 out: 920 ipv6_cleanup_mibs(net); 921 return err; 922 #endif 923 } 924 925 static void __net_exit inet6_net_exit(struct net *net) 926 { 927 #ifdef CONFIG_PROC_FS 928 udp6_proc_exit(net); 929 tcp6_proc_exit(net); 930 ac6_proc_exit(net); 931 #endif 932 ipv6_cleanup_mibs(net); 933 } 934 935 static struct pernet_operations inet6_net_ops = { 936 .init = inet6_net_init, 937 .exit = inet6_net_exit, 938 }; 939 940 static int ipv6_route_input(struct sk_buff *skb) 941 { 942 ip6_route_input(skb); 943 return skb_dst(skb)->error; 944 } 945 946 static const struct ipv6_stub ipv6_stub_impl = { 947 .ipv6_sock_mc_join = ipv6_sock_mc_join, 948 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 949 .ipv6_dst_lookup = ip6_dst_lookup, 950 .ipv6_route_input = ipv6_route_input, 951 .fib6_get_table = fib6_get_table, 952 .fib6_table_lookup = fib6_table_lookup, 953 .fib6_lookup = fib6_lookup, 954 .fib6_select_path = fib6_select_path, 955 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6, 956 .fib6_nh_init = fib6_nh_init, 957 .fib6_nh_release = fib6_nh_release, 958 .fib6_update_sernum = fib6_update_sernum_stub, 959 .fib6_rt_update = fib6_rt_update, 960 .ip6_del_rt = ip6_del_rt, 961 .udpv6_encap_enable = udpv6_encap_enable, 962 .ndisc_send_na = ndisc_send_na, 963 .nd_tbl = &nd_tbl, 964 }; 965 966 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = { 967 .inet6_bind = __inet6_bind, 968 .udp6_lib_lookup = __udp6_lib_lookup, 969 }; 970 971 static int __init inet6_init(void) 972 { 973 struct list_head *r; 974 int err = 0; 975 976 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 977 978 /* Register the socket-side information for inet6_create. */ 979 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 980 INIT_LIST_HEAD(r); 981 982 if (disable_ipv6_mod) { 983 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 984 goto out; 985 } 986 987 err = proto_register(&tcpv6_prot, 1); 988 if (err) 989 goto out; 990 991 err = proto_register(&udpv6_prot, 1); 992 if (err) 993 goto out_unregister_tcp_proto; 994 995 err = proto_register(&udplitev6_prot, 1); 996 if (err) 997 goto out_unregister_udp_proto; 998 999 err = proto_register(&rawv6_prot, 1); 1000 if (err) 1001 goto out_unregister_udplite_proto; 1002 1003 err = proto_register(&pingv6_prot, 1); 1004 if (err) 1005 goto out_unregister_raw_proto; 1006 1007 /* We MUST register RAW sockets before we create the ICMP6, 1008 * IGMP6, or NDISC control sockets. 1009 */ 1010 err = rawv6_init(); 1011 if (err) 1012 goto out_unregister_ping_proto; 1013 1014 /* Register the family here so that the init calls below will 1015 * be able to create sockets. (?? is this dangerous ??) 1016 */ 1017 err = sock_register(&inet6_family_ops); 1018 if (err) 1019 goto out_sock_register_fail; 1020 1021 /* 1022 * ipngwg API draft makes clear that the correct semantics 1023 * for TCP and UDP is to consider one TCP and UDP instance 1024 * in a host available by both INET and INET6 APIs and 1025 * able to communicate via both network protocols. 1026 */ 1027 1028 err = register_pernet_subsys(&inet6_net_ops); 1029 if (err) 1030 goto register_pernet_fail; 1031 err = ip6_mr_init(); 1032 if (err) 1033 goto ipmr_fail; 1034 err = icmpv6_init(); 1035 if (err) 1036 goto icmp_fail; 1037 err = ndisc_init(); 1038 if (err) 1039 goto ndisc_fail; 1040 err = igmp6_init(); 1041 if (err) 1042 goto igmp_fail; 1043 1044 err = ipv6_netfilter_init(); 1045 if (err) 1046 goto netfilter_fail; 1047 /* Create /proc/foo6 entries. */ 1048 #ifdef CONFIG_PROC_FS 1049 err = -ENOMEM; 1050 if (raw6_proc_init()) 1051 goto proc_raw6_fail; 1052 if (udplite6_proc_init()) 1053 goto proc_udplite6_fail; 1054 if (ipv6_misc_proc_init()) 1055 goto proc_misc6_fail; 1056 if (if6_proc_init()) 1057 goto proc_if6_fail; 1058 #endif 1059 err = ip6_route_init(); 1060 if (err) 1061 goto ip6_route_fail; 1062 err = ndisc_late_init(); 1063 if (err) 1064 goto ndisc_late_fail; 1065 err = ip6_flowlabel_init(); 1066 if (err) 1067 goto ip6_flowlabel_fail; 1068 err = ipv6_anycast_init(); 1069 if (err) 1070 goto ipv6_anycast_fail; 1071 err = addrconf_init(); 1072 if (err) 1073 goto addrconf_fail; 1074 1075 /* Init v6 extension headers. */ 1076 err = ipv6_exthdrs_init(); 1077 if (err) 1078 goto ipv6_exthdrs_fail; 1079 1080 err = ipv6_frag_init(); 1081 if (err) 1082 goto ipv6_frag_fail; 1083 1084 /* Init v6 transport protocols. */ 1085 err = udpv6_init(); 1086 if (err) 1087 goto udpv6_fail; 1088 1089 err = udplitev6_init(); 1090 if (err) 1091 goto udplitev6_fail; 1092 1093 err = udpv6_offload_init(); 1094 if (err) 1095 goto udpv6_offload_fail; 1096 1097 err = tcpv6_init(); 1098 if (err) 1099 goto tcpv6_fail; 1100 1101 err = ipv6_packet_init(); 1102 if (err) 1103 goto ipv6_packet_fail; 1104 1105 err = pingv6_init(); 1106 if (err) 1107 goto pingv6_fail; 1108 1109 err = calipso_init(); 1110 if (err) 1111 goto calipso_fail; 1112 1113 err = seg6_init(); 1114 if (err) 1115 goto seg6_fail; 1116 1117 err = igmp6_late_init(); 1118 if (err) 1119 goto igmp6_late_err; 1120 1121 #ifdef CONFIG_SYSCTL 1122 err = ipv6_sysctl_register(); 1123 if (err) 1124 goto sysctl_fail; 1125 #endif 1126 1127 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1128 wmb(); 1129 ipv6_stub = &ipv6_stub_impl; 1130 ipv6_bpf_stub = &ipv6_bpf_stub_impl; 1131 out: 1132 return err; 1133 1134 #ifdef CONFIG_SYSCTL 1135 sysctl_fail: 1136 igmp6_late_cleanup(); 1137 #endif 1138 igmp6_late_err: 1139 seg6_exit(); 1140 seg6_fail: 1141 calipso_exit(); 1142 calipso_fail: 1143 pingv6_exit(); 1144 pingv6_fail: 1145 ipv6_packet_cleanup(); 1146 ipv6_packet_fail: 1147 tcpv6_exit(); 1148 tcpv6_fail: 1149 udpv6_offload_exit(); 1150 udpv6_offload_fail: 1151 udplitev6_exit(); 1152 udplitev6_fail: 1153 udpv6_exit(); 1154 udpv6_fail: 1155 ipv6_frag_exit(); 1156 ipv6_frag_fail: 1157 ipv6_exthdrs_exit(); 1158 ipv6_exthdrs_fail: 1159 addrconf_cleanup(); 1160 addrconf_fail: 1161 ipv6_anycast_cleanup(); 1162 ipv6_anycast_fail: 1163 ip6_flowlabel_cleanup(); 1164 ip6_flowlabel_fail: 1165 ndisc_late_cleanup(); 1166 ndisc_late_fail: 1167 ip6_route_cleanup(); 1168 ip6_route_fail: 1169 #ifdef CONFIG_PROC_FS 1170 if6_proc_exit(); 1171 proc_if6_fail: 1172 ipv6_misc_proc_exit(); 1173 proc_misc6_fail: 1174 udplite6_proc_exit(); 1175 proc_udplite6_fail: 1176 raw6_proc_exit(); 1177 proc_raw6_fail: 1178 #endif 1179 ipv6_netfilter_fini(); 1180 netfilter_fail: 1181 igmp6_cleanup(); 1182 igmp_fail: 1183 ndisc_cleanup(); 1184 ndisc_fail: 1185 icmpv6_cleanup(); 1186 icmp_fail: 1187 ip6_mr_cleanup(); 1188 ipmr_fail: 1189 unregister_pernet_subsys(&inet6_net_ops); 1190 register_pernet_fail: 1191 sock_unregister(PF_INET6); 1192 rtnl_unregister_all(PF_INET6); 1193 out_sock_register_fail: 1194 rawv6_exit(); 1195 out_unregister_ping_proto: 1196 proto_unregister(&pingv6_prot); 1197 out_unregister_raw_proto: 1198 proto_unregister(&rawv6_prot); 1199 out_unregister_udplite_proto: 1200 proto_unregister(&udplitev6_prot); 1201 out_unregister_udp_proto: 1202 proto_unregister(&udpv6_prot); 1203 out_unregister_tcp_proto: 1204 proto_unregister(&tcpv6_prot); 1205 goto out; 1206 } 1207 module_init(inet6_init); 1208 1209 MODULE_ALIAS_NETPROTO(PF_INET6); 1210