1 /* 2 * PF_INET6 socket protocol family 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * Adapted from linux/net/ipv4/af_inet.c 9 * 10 * Fixes: 11 * piggy, Karl Knutson : Socket protocol table 12 * Hideaki YOSHIFUJI : sin6_scope_id support 13 * Arnaldo Melo : check proc_net_create return, cleanups 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 */ 20 21 #define pr_fmt(fmt) "IPv6: " fmt 22 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/errno.h> 26 #include <linux/types.h> 27 #include <linux/socket.h> 28 #include <linux/in.h> 29 #include <linux/kernel.h> 30 #include <linux/timer.h> 31 #include <linux/string.h> 32 #include <linux/sockios.h> 33 #include <linux/net.h> 34 #include <linux/fcntl.h> 35 #include <linux/mm.h> 36 #include <linux/interrupt.h> 37 #include <linux/proc_fs.h> 38 #include <linux/stat.h> 39 #include <linux/init.h> 40 #include <linux/slab.h> 41 42 #include <linux/inet.h> 43 #include <linux/netdevice.h> 44 #include <linux/icmpv6.h> 45 #include <linux/netfilter_ipv6.h> 46 47 #include <net/ip.h> 48 #include <net/ipv6.h> 49 #include <net/udp.h> 50 #include <net/udplite.h> 51 #include <net/tcp.h> 52 #include <net/ping.h> 53 #include <net/protocol.h> 54 #include <net/inet_common.h> 55 #include <net/route.h> 56 #include <net/transp_v6.h> 57 #include <net/ip6_route.h> 58 #include <net/addrconf.h> 59 #include <net/ndisc.h> 60 #ifdef CONFIG_IPV6_TUNNEL 61 #include <net/ip6_tunnel.h> 62 #endif 63 #include <net/calipso.h> 64 #include <net/seg6.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; 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 bool force_bind_address_no_port, bool with_lock) 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 && snum < inet_prot_sock(net) && 299 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 300 return -EACCES; 301 302 if (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 force_bind_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 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk); 413 if (err) { 414 sk->sk_ipv6only = saved_ipv6only; 415 inet_reset_saddr(sk); 416 goto out; 417 } 418 } 419 420 if (addr_type != IPV6_ADDR_ANY) 421 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 422 if (snum) 423 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 424 inet->inet_sport = htons(inet->inet_num); 425 inet->inet_dport = 0; 426 inet->inet_daddr = 0; 427 out: 428 if (with_lock) 429 release_sock(sk); 430 return err; 431 out_unlock: 432 rcu_read_unlock(); 433 goto out; 434 } 435 436 /* bind for INET6 API */ 437 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 438 { 439 struct sock *sk = sock->sk; 440 int err = 0; 441 442 /* If the socket has its own bind function then use it. */ 443 if (sk->sk_prot->bind) 444 return sk->sk_prot->bind(sk, uaddr, addr_len); 445 446 if (addr_len < SIN6_LEN_RFC2133) 447 return -EINVAL; 448 449 /* BPF prog is run before any checks are done so that if the prog 450 * changes context in a wrong way it will be caught. 451 */ 452 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr); 453 if (err) 454 return err; 455 456 return __inet6_bind(sk, uaddr, addr_len, false, true); 457 } 458 EXPORT_SYMBOL(inet6_bind); 459 460 int inet6_release(struct socket *sock) 461 { 462 struct sock *sk = sock->sk; 463 464 if (!sk) 465 return -EINVAL; 466 467 /* Free mc lists */ 468 ipv6_sock_mc_close(sk); 469 470 /* Free ac lists */ 471 ipv6_sock_ac_close(sk); 472 473 return inet_release(sock); 474 } 475 EXPORT_SYMBOL(inet6_release); 476 477 void inet6_destroy_sock(struct sock *sk) 478 { 479 struct ipv6_pinfo *np = inet6_sk(sk); 480 struct sk_buff *skb; 481 struct ipv6_txoptions *opt; 482 483 /* Release rx options */ 484 485 skb = xchg(&np->pktoptions, NULL); 486 kfree_skb(skb); 487 488 skb = xchg(&np->rxpmtu, NULL); 489 kfree_skb(skb); 490 491 /* Free flowlabels */ 492 fl6_free_socklist(sk); 493 494 /* Free tx options */ 495 496 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 497 if (opt) { 498 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 499 txopt_put(opt); 500 } 501 } 502 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 503 504 /* 505 * This does both peername and sockname. 506 */ 507 508 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 509 int peer) 510 { 511 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 512 struct sock *sk = sock->sk; 513 struct inet_sock *inet = inet_sk(sk); 514 struct ipv6_pinfo *np = inet6_sk(sk); 515 516 sin->sin6_family = AF_INET6; 517 sin->sin6_flowinfo = 0; 518 sin->sin6_scope_id = 0; 519 if (peer) { 520 if (!inet->inet_dport) 521 return -ENOTCONN; 522 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 523 peer == 1) 524 return -ENOTCONN; 525 sin->sin6_port = inet->inet_dport; 526 sin->sin6_addr = sk->sk_v6_daddr; 527 if (np->sndflow) 528 sin->sin6_flowinfo = np->flow_label; 529 } else { 530 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 531 sin->sin6_addr = np->saddr; 532 else 533 sin->sin6_addr = sk->sk_v6_rcv_saddr; 534 535 sin->sin6_port = inet->inet_sport; 536 } 537 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 538 sk->sk_bound_dev_if); 539 return sizeof(*sin); 540 } 541 EXPORT_SYMBOL(inet6_getname); 542 543 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 544 { 545 struct sock *sk = sock->sk; 546 struct net *net = sock_net(sk); 547 548 switch (cmd) { 549 case SIOCGSTAMP: 550 return sock_get_timestamp(sk, (struct timeval __user *)arg); 551 552 case SIOCGSTAMPNS: 553 return sock_get_timestampns(sk, (struct timespec __user *)arg); 554 555 case SIOCADDRT: 556 case SIOCDELRT: 557 558 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 559 560 case SIOCSIFADDR: 561 return addrconf_add_ifaddr(net, (void __user *) arg); 562 case SIOCDIFADDR: 563 return addrconf_del_ifaddr(net, (void __user *) arg); 564 case SIOCSIFDSTADDR: 565 return addrconf_set_dstaddr(net, (void __user *) arg); 566 default: 567 if (!sk->sk_prot->ioctl) 568 return -ENOIOCTLCMD; 569 return sk->sk_prot->ioctl(sk, cmd, arg); 570 } 571 /*NOTREACHED*/ 572 return 0; 573 } 574 EXPORT_SYMBOL(inet6_ioctl); 575 576 const struct proto_ops inet6_stream_ops = { 577 .family = PF_INET6, 578 .owner = THIS_MODULE, 579 .release = inet6_release, 580 .bind = inet6_bind, 581 .connect = inet_stream_connect, /* ok */ 582 .socketpair = sock_no_socketpair, /* a do nothing */ 583 .accept = inet_accept, /* ok */ 584 .getname = inet6_getname, 585 .poll = tcp_poll, /* ok */ 586 .ioctl = inet6_ioctl, /* must change */ 587 .listen = inet_listen, /* ok */ 588 .shutdown = inet_shutdown, /* ok */ 589 .setsockopt = sock_common_setsockopt, /* ok */ 590 .getsockopt = sock_common_getsockopt, /* ok */ 591 .sendmsg = inet_sendmsg, /* ok */ 592 .recvmsg = inet_recvmsg, /* ok */ 593 #ifdef CONFIG_MMU 594 .mmap = tcp_mmap, 595 #endif 596 .sendpage = inet_sendpage, 597 .sendmsg_locked = tcp_sendmsg_locked, 598 .sendpage_locked = tcp_sendpage_locked, 599 .splice_read = tcp_splice_read, 600 .read_sock = tcp_read_sock, 601 .peek_len = tcp_peek_len, 602 #ifdef CONFIG_COMPAT 603 .compat_setsockopt = compat_sock_common_setsockopt, 604 .compat_getsockopt = compat_sock_common_getsockopt, 605 #endif 606 .set_rcvlowat = tcp_set_rcvlowat, 607 }; 608 609 const struct proto_ops inet6_dgram_ops = { 610 .family = PF_INET6, 611 .owner = THIS_MODULE, 612 .release = inet6_release, 613 .bind = inet6_bind, 614 .connect = inet_dgram_connect, /* ok */ 615 .socketpair = sock_no_socketpair, /* a do nothing */ 616 .accept = sock_no_accept, /* a do nothing */ 617 .getname = inet6_getname, 618 .poll = udp_poll, /* ok */ 619 .ioctl = inet6_ioctl, /* must change */ 620 .listen = sock_no_listen, /* ok */ 621 .shutdown = inet_shutdown, /* ok */ 622 .setsockopt = sock_common_setsockopt, /* ok */ 623 .getsockopt = sock_common_getsockopt, /* ok */ 624 .sendmsg = inet_sendmsg, /* ok */ 625 .recvmsg = inet_recvmsg, /* ok */ 626 .mmap = sock_no_mmap, 627 .sendpage = sock_no_sendpage, 628 .set_peek_off = sk_set_peek_off, 629 #ifdef CONFIG_COMPAT 630 .compat_setsockopt = compat_sock_common_setsockopt, 631 .compat_getsockopt = compat_sock_common_getsockopt, 632 #endif 633 }; 634 635 static const struct net_proto_family inet6_family_ops = { 636 .family = PF_INET6, 637 .create = inet6_create, 638 .owner = THIS_MODULE, 639 }; 640 641 int inet6_register_protosw(struct inet_protosw *p) 642 { 643 struct list_head *lh; 644 struct inet_protosw *answer; 645 struct list_head *last_perm; 646 int protocol = p->protocol; 647 int ret; 648 649 spin_lock_bh(&inetsw6_lock); 650 651 ret = -EINVAL; 652 if (p->type >= SOCK_MAX) 653 goto out_illegal; 654 655 /* If we are trying to override a permanent protocol, bail. */ 656 answer = NULL; 657 ret = -EPERM; 658 last_perm = &inetsw6[p->type]; 659 list_for_each(lh, &inetsw6[p->type]) { 660 answer = list_entry(lh, struct inet_protosw, list); 661 662 /* Check only the non-wild match. */ 663 if (INET_PROTOSW_PERMANENT & answer->flags) { 664 if (protocol == answer->protocol) 665 break; 666 last_perm = lh; 667 } 668 669 answer = NULL; 670 } 671 if (answer) 672 goto out_permanent; 673 674 /* Add the new entry after the last permanent entry if any, so that 675 * the new entry does not override a permanent entry when matched with 676 * a wild-card protocol. But it is allowed to override any existing 677 * non-permanent entry. This means that when we remove this entry, the 678 * system automatically returns to the old behavior. 679 */ 680 list_add_rcu(&p->list, last_perm); 681 ret = 0; 682 out: 683 spin_unlock_bh(&inetsw6_lock); 684 return ret; 685 686 out_permanent: 687 pr_err("Attempt to override permanent protocol %d\n", protocol); 688 goto out; 689 690 out_illegal: 691 pr_err("Ignoring attempt to register invalid socket type %d\n", 692 p->type); 693 goto out; 694 } 695 EXPORT_SYMBOL(inet6_register_protosw); 696 697 void 698 inet6_unregister_protosw(struct inet_protosw *p) 699 { 700 if (INET_PROTOSW_PERMANENT & p->flags) { 701 pr_err("Attempt to unregister permanent protocol %d\n", 702 p->protocol); 703 } else { 704 spin_lock_bh(&inetsw6_lock); 705 list_del_rcu(&p->list); 706 spin_unlock_bh(&inetsw6_lock); 707 708 synchronize_net(); 709 } 710 } 711 EXPORT_SYMBOL(inet6_unregister_protosw); 712 713 int inet6_sk_rebuild_header(struct sock *sk) 714 { 715 struct ipv6_pinfo *np = inet6_sk(sk); 716 struct dst_entry *dst; 717 718 dst = __sk_dst_check(sk, np->dst_cookie); 719 720 if (!dst) { 721 struct inet_sock *inet = inet_sk(sk); 722 struct in6_addr *final_p, final; 723 struct flowi6 fl6; 724 725 memset(&fl6, 0, sizeof(fl6)); 726 fl6.flowi6_proto = sk->sk_protocol; 727 fl6.daddr = sk->sk_v6_daddr; 728 fl6.saddr = np->saddr; 729 fl6.flowlabel = np->flow_label; 730 fl6.flowi6_oif = sk->sk_bound_dev_if; 731 fl6.flowi6_mark = sk->sk_mark; 732 fl6.fl6_dport = inet->inet_dport; 733 fl6.fl6_sport = inet->inet_sport; 734 fl6.flowi6_uid = sk->sk_uid; 735 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 736 737 rcu_read_lock(); 738 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 739 &final); 740 rcu_read_unlock(); 741 742 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 743 if (IS_ERR(dst)) { 744 sk->sk_route_caps = 0; 745 sk->sk_err_soft = -PTR_ERR(dst); 746 return PTR_ERR(dst); 747 } 748 749 ip6_dst_store(sk, dst, NULL, NULL); 750 } 751 752 return 0; 753 } 754 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 755 756 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 757 const struct inet6_skb_parm *opt) 758 { 759 const struct ipv6_pinfo *np = inet6_sk(sk); 760 761 if (np->rxopt.all) { 762 if (((opt->flags & IP6SKB_HOPBYHOP) && 763 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 764 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 765 np->rxopt.bits.rxflow) || 766 (opt->srcrt && (np->rxopt.bits.srcrt || 767 np->rxopt.bits.osrcrt)) || 768 ((opt->dst1 || opt->dst0) && 769 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 770 return true; 771 } 772 return false; 773 } 774 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 775 776 static struct packet_type ipv6_packet_type __read_mostly = { 777 .type = cpu_to_be16(ETH_P_IPV6), 778 .func = ipv6_rcv, 779 .list_func = ipv6_list_rcv, 780 }; 781 782 static int __init ipv6_packet_init(void) 783 { 784 dev_add_pack(&ipv6_packet_type); 785 return 0; 786 } 787 788 static void ipv6_packet_cleanup(void) 789 { 790 dev_remove_pack(&ipv6_packet_type); 791 } 792 793 static int __net_init ipv6_init_mibs(struct net *net) 794 { 795 int i; 796 797 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 798 if (!net->mib.udp_stats_in6) 799 return -ENOMEM; 800 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 801 if (!net->mib.udplite_stats_in6) 802 goto err_udplite_mib; 803 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 804 if (!net->mib.ipv6_statistics) 805 goto err_ip_mib; 806 807 for_each_possible_cpu(i) { 808 struct ipstats_mib *af_inet6_stats; 809 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 810 u64_stats_init(&af_inet6_stats->syncp); 811 } 812 813 814 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 815 if (!net->mib.icmpv6_statistics) 816 goto err_icmp_mib; 817 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 818 GFP_KERNEL); 819 if (!net->mib.icmpv6msg_statistics) 820 goto err_icmpmsg_mib; 821 return 0; 822 823 err_icmpmsg_mib: 824 free_percpu(net->mib.icmpv6_statistics); 825 err_icmp_mib: 826 free_percpu(net->mib.ipv6_statistics); 827 err_ip_mib: 828 free_percpu(net->mib.udplite_stats_in6); 829 err_udplite_mib: 830 free_percpu(net->mib.udp_stats_in6); 831 return -ENOMEM; 832 } 833 834 static void ipv6_cleanup_mibs(struct net *net) 835 { 836 free_percpu(net->mib.udp_stats_in6); 837 free_percpu(net->mib.udplite_stats_in6); 838 free_percpu(net->mib.ipv6_statistics); 839 free_percpu(net->mib.icmpv6_statistics); 840 kfree(net->mib.icmpv6msg_statistics); 841 } 842 843 static int __net_init inet6_net_init(struct net *net) 844 { 845 int err = 0; 846 847 net->ipv6.sysctl.bindv6only = 0; 848 net->ipv6.sysctl.icmpv6_time = 1*HZ; 849 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0; 850 net->ipv6.sysctl.flowlabel_consistency = 1; 851 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 852 net->ipv6.sysctl.idgen_retries = 3; 853 net->ipv6.sysctl.idgen_delay = 1 * HZ; 854 net->ipv6.sysctl.flowlabel_state_ranges = 0; 855 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 856 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 857 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 858 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 859 atomic_set(&net->ipv6.fib6_sernum, 1); 860 861 err = ipv6_init_mibs(net); 862 if (err) 863 return err; 864 #ifdef CONFIG_PROC_FS 865 err = udp6_proc_init(net); 866 if (err) 867 goto out; 868 err = tcp6_proc_init(net); 869 if (err) 870 goto proc_tcp6_fail; 871 err = ac6_proc_init(net); 872 if (err) 873 goto proc_ac6_fail; 874 #endif 875 return err; 876 877 #ifdef CONFIG_PROC_FS 878 proc_ac6_fail: 879 tcp6_proc_exit(net); 880 proc_tcp6_fail: 881 udp6_proc_exit(net); 882 out: 883 ipv6_cleanup_mibs(net); 884 return err; 885 #endif 886 } 887 888 static void __net_exit inet6_net_exit(struct net *net) 889 { 890 #ifdef CONFIG_PROC_FS 891 udp6_proc_exit(net); 892 tcp6_proc_exit(net); 893 ac6_proc_exit(net); 894 #endif 895 ipv6_cleanup_mibs(net); 896 } 897 898 static struct pernet_operations inet6_net_ops = { 899 .init = inet6_net_init, 900 .exit = inet6_net_exit, 901 }; 902 903 static const struct ipv6_stub ipv6_stub_impl = { 904 .ipv6_sock_mc_join = ipv6_sock_mc_join, 905 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 906 .ipv6_dst_lookup = ip6_dst_lookup, 907 .fib6_get_table = fib6_get_table, 908 .fib6_table_lookup = fib6_table_lookup, 909 .fib6_lookup = fib6_lookup, 910 .fib6_multipath_select = fib6_multipath_select, 911 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6, 912 .udpv6_encap_enable = udpv6_encap_enable, 913 .ndisc_send_na = ndisc_send_na, 914 .nd_tbl = &nd_tbl, 915 }; 916 917 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = { 918 .inet6_bind = __inet6_bind, 919 .udp6_lib_lookup = __udp6_lib_lookup, 920 }; 921 922 static int __init inet6_init(void) 923 { 924 struct list_head *r; 925 int err = 0; 926 927 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 928 929 /* Register the socket-side information for inet6_create. */ 930 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 931 INIT_LIST_HEAD(r); 932 933 if (disable_ipv6_mod) { 934 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 935 goto out; 936 } 937 938 err = proto_register(&tcpv6_prot, 1); 939 if (err) 940 goto out; 941 942 err = proto_register(&udpv6_prot, 1); 943 if (err) 944 goto out_unregister_tcp_proto; 945 946 err = proto_register(&udplitev6_prot, 1); 947 if (err) 948 goto out_unregister_udp_proto; 949 950 err = proto_register(&rawv6_prot, 1); 951 if (err) 952 goto out_unregister_udplite_proto; 953 954 err = proto_register(&pingv6_prot, 1); 955 if (err) 956 goto out_unregister_raw_proto; 957 958 /* We MUST register RAW sockets before we create the ICMP6, 959 * IGMP6, or NDISC control sockets. 960 */ 961 err = rawv6_init(); 962 if (err) 963 goto out_unregister_ping_proto; 964 965 /* Register the family here so that the init calls below will 966 * be able to create sockets. (?? is this dangerous ??) 967 */ 968 err = sock_register(&inet6_family_ops); 969 if (err) 970 goto out_sock_register_fail; 971 972 /* 973 * ipngwg API draft makes clear that the correct semantics 974 * for TCP and UDP is to consider one TCP and UDP instance 975 * in a host available by both INET and INET6 APIs and 976 * able to communicate via both network protocols. 977 */ 978 979 err = register_pernet_subsys(&inet6_net_ops); 980 if (err) 981 goto register_pernet_fail; 982 err = ip6_mr_init(); 983 if (err) 984 goto ipmr_fail; 985 err = icmpv6_init(); 986 if (err) 987 goto icmp_fail; 988 err = ndisc_init(); 989 if (err) 990 goto ndisc_fail; 991 err = igmp6_init(); 992 if (err) 993 goto igmp_fail; 994 995 err = ipv6_netfilter_init(); 996 if (err) 997 goto netfilter_fail; 998 /* Create /proc/foo6 entries. */ 999 #ifdef CONFIG_PROC_FS 1000 err = -ENOMEM; 1001 if (raw6_proc_init()) 1002 goto proc_raw6_fail; 1003 if (udplite6_proc_init()) 1004 goto proc_udplite6_fail; 1005 if (ipv6_misc_proc_init()) 1006 goto proc_misc6_fail; 1007 if (if6_proc_init()) 1008 goto proc_if6_fail; 1009 #endif 1010 err = ip6_route_init(); 1011 if (err) 1012 goto ip6_route_fail; 1013 err = ndisc_late_init(); 1014 if (err) 1015 goto ndisc_late_fail; 1016 err = ip6_flowlabel_init(); 1017 if (err) 1018 goto ip6_flowlabel_fail; 1019 err = ipv6_anycast_init(); 1020 if (err) 1021 goto ipv6_anycast_fail; 1022 err = addrconf_init(); 1023 if (err) 1024 goto addrconf_fail; 1025 1026 /* Init v6 extension headers. */ 1027 err = ipv6_exthdrs_init(); 1028 if (err) 1029 goto ipv6_exthdrs_fail; 1030 1031 err = ipv6_frag_init(); 1032 if (err) 1033 goto ipv6_frag_fail; 1034 1035 /* Init v6 transport protocols. */ 1036 err = udpv6_init(); 1037 if (err) 1038 goto udpv6_fail; 1039 1040 err = udplitev6_init(); 1041 if (err) 1042 goto udplitev6_fail; 1043 1044 err = udpv6_offload_init(); 1045 if (err) 1046 goto udpv6_offload_fail; 1047 1048 err = tcpv6_init(); 1049 if (err) 1050 goto tcpv6_fail; 1051 1052 err = ipv6_packet_init(); 1053 if (err) 1054 goto ipv6_packet_fail; 1055 1056 err = pingv6_init(); 1057 if (err) 1058 goto pingv6_fail; 1059 1060 err = calipso_init(); 1061 if (err) 1062 goto calipso_fail; 1063 1064 err = seg6_init(); 1065 if (err) 1066 goto seg6_fail; 1067 1068 err = igmp6_late_init(); 1069 if (err) 1070 goto igmp6_late_err; 1071 1072 #ifdef CONFIG_SYSCTL 1073 err = ipv6_sysctl_register(); 1074 if (err) 1075 goto sysctl_fail; 1076 #endif 1077 1078 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1079 wmb(); 1080 ipv6_stub = &ipv6_stub_impl; 1081 ipv6_bpf_stub = &ipv6_bpf_stub_impl; 1082 out: 1083 return err; 1084 1085 #ifdef CONFIG_SYSCTL 1086 sysctl_fail: 1087 igmp6_late_cleanup(); 1088 #endif 1089 igmp6_late_err: 1090 seg6_exit(); 1091 seg6_fail: 1092 calipso_exit(); 1093 calipso_fail: 1094 pingv6_exit(); 1095 pingv6_fail: 1096 ipv6_packet_cleanup(); 1097 ipv6_packet_fail: 1098 tcpv6_exit(); 1099 tcpv6_fail: 1100 udpv6_offload_exit(); 1101 udpv6_offload_fail: 1102 udplitev6_exit(); 1103 udplitev6_fail: 1104 udpv6_exit(); 1105 udpv6_fail: 1106 ipv6_frag_exit(); 1107 ipv6_frag_fail: 1108 ipv6_exthdrs_exit(); 1109 ipv6_exthdrs_fail: 1110 addrconf_cleanup(); 1111 addrconf_fail: 1112 ipv6_anycast_cleanup(); 1113 ipv6_anycast_fail: 1114 ip6_flowlabel_cleanup(); 1115 ip6_flowlabel_fail: 1116 ndisc_late_cleanup(); 1117 ndisc_late_fail: 1118 ip6_route_cleanup(); 1119 ip6_route_fail: 1120 #ifdef CONFIG_PROC_FS 1121 if6_proc_exit(); 1122 proc_if6_fail: 1123 ipv6_misc_proc_exit(); 1124 proc_misc6_fail: 1125 udplite6_proc_exit(); 1126 proc_udplite6_fail: 1127 raw6_proc_exit(); 1128 proc_raw6_fail: 1129 #endif 1130 ipv6_netfilter_fini(); 1131 netfilter_fail: 1132 igmp6_cleanup(); 1133 igmp_fail: 1134 ndisc_cleanup(); 1135 ndisc_fail: 1136 icmpv6_cleanup(); 1137 icmp_fail: 1138 ip6_mr_cleanup(); 1139 ipmr_fail: 1140 unregister_pernet_subsys(&inet6_net_ops); 1141 register_pernet_fail: 1142 sock_unregister(PF_INET6); 1143 rtnl_unregister_all(PF_INET6); 1144 out_sock_register_fail: 1145 rawv6_exit(); 1146 out_unregister_ping_proto: 1147 proto_unregister(&pingv6_prot); 1148 out_unregister_raw_proto: 1149 proto_unregister(&rawv6_prot); 1150 out_unregister_udplite_proto: 1151 proto_unregister(&udplitev6_prot); 1152 out_unregister_udp_proto: 1153 proto_unregister(&udpv6_prot); 1154 out_unregister_tcp_proto: 1155 proto_unregister(&tcpv6_prot); 1156 goto out; 1157 } 1158 module_init(inet6_init); 1159 1160 MODULE_ALIAS_NETPROTO(PF_INET6); 1161