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/ipv6_stubs.h> 60 #include <net/ndisc.h> 61 #ifdef CONFIG_IPV6_TUNNEL 62 #include <net/ip6_tunnel.h> 63 #endif 64 #include <net/calipso.h> 65 #include <net/seg6.h> 66 67 #include <linux/uaccess.h> 68 #include <linux/mroute6.h> 69 70 #include "ip6_offload.h" 71 72 MODULE_AUTHOR("Cast of dozens"); 73 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 74 MODULE_LICENSE("GPL"); 75 76 /* The inetsw6 table contains everything that inet6_create needs to 77 * build a new socket. 78 */ 79 static struct list_head inetsw6[SOCK_MAX]; 80 static DEFINE_SPINLOCK(inetsw6_lock); 81 82 struct ipv6_params ipv6_defaults = { 83 .disable_ipv6 = 0, 84 .autoconf = 1, 85 }; 86 87 static int disable_ipv6_mod; 88 89 module_param_named(disable, disable_ipv6_mod, int, 0444); 90 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 91 92 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 93 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 94 95 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 96 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 97 98 bool ipv6_mod_enabled(void) 99 { 100 return disable_ipv6_mod == 0; 101 } 102 EXPORT_SYMBOL_GPL(ipv6_mod_enabled); 103 104 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 105 { 106 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 107 108 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 109 } 110 111 static int inet6_create(struct net *net, struct socket *sock, int protocol, 112 int kern) 113 { 114 struct inet_sock *inet; 115 struct ipv6_pinfo *np; 116 struct sock *sk; 117 struct inet_protosw *answer; 118 struct proto *answer_prot; 119 unsigned char answer_flags; 120 int try_loading_module = 0; 121 int err; 122 123 if (protocol < 0 || protocol >= IPPROTO_MAX) 124 return -EINVAL; 125 126 /* Look for the requested type/protocol pair. */ 127 lookup_protocol: 128 err = -ESOCKTNOSUPPORT; 129 rcu_read_lock(); 130 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 131 132 err = 0; 133 /* Check the non-wild match. */ 134 if (protocol == answer->protocol) { 135 if (protocol != IPPROTO_IP) 136 break; 137 } else { 138 /* Check for the two wild cases. */ 139 if (IPPROTO_IP == protocol) { 140 protocol = answer->protocol; 141 break; 142 } 143 if (IPPROTO_IP == answer->protocol) 144 break; 145 } 146 err = -EPROTONOSUPPORT; 147 } 148 149 if (err) { 150 if (try_loading_module < 2) { 151 rcu_read_unlock(); 152 /* 153 * Be more specific, e.g. net-pf-10-proto-132-type-1 154 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 155 */ 156 if (++try_loading_module == 1) 157 request_module("net-pf-%d-proto-%d-type-%d", 158 PF_INET6, protocol, sock->type); 159 /* 160 * Fall back to generic, e.g. net-pf-10-proto-132 161 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 162 */ 163 else 164 request_module("net-pf-%d-proto-%d", 165 PF_INET6, protocol); 166 goto lookup_protocol; 167 } else 168 goto out_rcu_unlock; 169 } 170 171 err = -EPERM; 172 if (sock->type == SOCK_RAW && !kern && 173 !ns_capable(net->user_ns, CAP_NET_RAW)) 174 goto out_rcu_unlock; 175 176 sock->ops = answer->ops; 177 answer_prot = answer->prot; 178 answer_flags = answer->flags; 179 rcu_read_unlock(); 180 181 WARN_ON(!answer_prot->slab); 182 183 err = -ENOBUFS; 184 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 185 if (!sk) 186 goto out; 187 188 sock_init_data(sock, sk); 189 190 err = 0; 191 if (INET_PROTOSW_REUSE & answer_flags) 192 sk->sk_reuse = SK_CAN_REUSE; 193 194 inet = inet_sk(sk); 195 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 196 197 if (SOCK_RAW == sock->type) { 198 inet->inet_num = protocol; 199 if (IPPROTO_RAW == protocol) 200 inet->hdrincl = 1; 201 } 202 203 sk->sk_destruct = inet_sock_destruct; 204 sk->sk_family = PF_INET6; 205 sk->sk_protocol = protocol; 206 207 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 208 209 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 210 np->hop_limit = -1; 211 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 212 np->mc_loop = 1; 213 np->mc_all = 1; 214 np->pmtudisc = IPV6_PMTUDISC_WANT; 215 np->repflow = net->ipv6.sysctl.flowlabel_reflect; 216 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 217 218 /* Init the ipv4 part of the socket since we can have sockets 219 * using v6 API for ipv4. 220 */ 221 inet->uc_ttl = -1; 222 223 inet->mc_loop = 1; 224 inet->mc_ttl = 1; 225 inet->mc_index = 0; 226 inet->mc_list = NULL; 227 inet->rcv_tos = 0; 228 229 if (net->ipv4.sysctl_ip_no_pmtu_disc) 230 inet->pmtudisc = IP_PMTUDISC_DONT; 231 else 232 inet->pmtudisc = IP_PMTUDISC_WANT; 233 /* 234 * Increment only the relevant sk_prot->socks debug field, this changes 235 * the previous behaviour of incrementing both the equivalent to 236 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 237 * 238 * This allows better debug granularity as we'll know exactly how many 239 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 240 * transport protocol socks. -acme 241 */ 242 sk_refcnt_debug_inc(sk); 243 244 if (inet->inet_num) { 245 /* It assumes that any protocol which allows 246 * the user to assign a number at socket 247 * creation time automatically shares. 248 */ 249 inet->inet_sport = htons(inet->inet_num); 250 err = sk->sk_prot->hash(sk); 251 if (err) { 252 sk_common_release(sk); 253 goto out; 254 } 255 } 256 if (sk->sk_prot->init) { 257 err = sk->sk_prot->init(sk); 258 if (err) { 259 sk_common_release(sk); 260 goto out; 261 } 262 } 263 264 if (!kern) { 265 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 266 if (err) { 267 sk_common_release(sk); 268 goto out; 269 } 270 } 271 out: 272 return err; 273 out_rcu_unlock: 274 rcu_read_unlock(); 275 goto out; 276 } 277 278 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, 279 bool force_bind_address_no_port, bool with_lock) 280 { 281 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 282 struct inet_sock *inet = inet_sk(sk); 283 struct ipv6_pinfo *np = inet6_sk(sk); 284 struct net *net = sock_net(sk); 285 __be32 v4addr = 0; 286 unsigned short snum; 287 bool saved_ipv6only; 288 int addr_type = 0; 289 int err = 0; 290 291 if (addr->sin6_family != AF_INET6) 292 return -EAFNOSUPPORT; 293 294 addr_type = ipv6_addr_type(&addr->sin6_addr); 295 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM) 296 return -EINVAL; 297 298 snum = ntohs(addr->sin6_port); 299 if (snum && snum < inet_prot_sock(net) && 300 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 301 return -EACCES; 302 303 if (with_lock) 304 lock_sock(sk); 305 306 /* Check these errors (active socket, double bind). */ 307 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 308 err = -EINVAL; 309 goto out; 310 } 311 312 /* Check if the address belongs to the host. */ 313 if (addr_type == IPV6_ADDR_MAPPED) { 314 struct net_device *dev = NULL; 315 int chk_addr_ret; 316 317 /* Binding to v4-mapped address on a v6-only socket 318 * makes no sense 319 */ 320 if (sk->sk_ipv6only) { 321 err = -EINVAL; 322 goto out; 323 } 324 325 rcu_read_lock(); 326 if (sk->sk_bound_dev_if) { 327 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 328 if (!dev) { 329 err = -ENODEV; 330 goto out_unlock; 331 } 332 } 333 334 /* Reproduce AF_INET checks to make the bindings consistent */ 335 v4addr = addr->sin6_addr.s6_addr32[3]; 336 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr); 337 rcu_read_unlock(); 338 339 if (!inet_can_nonlocal_bind(net, inet) && 340 v4addr != htonl(INADDR_ANY) && 341 chk_addr_ret != RTN_LOCAL && 342 chk_addr_ret != RTN_MULTICAST && 343 chk_addr_ret != RTN_BROADCAST) { 344 err = -EADDRNOTAVAIL; 345 goto out; 346 } 347 } else { 348 if (addr_type != IPV6_ADDR_ANY) { 349 struct net_device *dev = NULL; 350 351 rcu_read_lock(); 352 if (__ipv6_addr_needs_scope_id(addr_type)) { 353 if (addr_len >= sizeof(struct sockaddr_in6) && 354 addr->sin6_scope_id) { 355 /* Override any existing binding, if another one 356 * is supplied by user. 357 */ 358 sk->sk_bound_dev_if = addr->sin6_scope_id; 359 } 360 361 /* Binding to link-local address requires an interface */ 362 if (!sk->sk_bound_dev_if) { 363 err = -EINVAL; 364 goto out_unlock; 365 } 366 } 367 368 if (sk->sk_bound_dev_if) { 369 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 370 if (!dev) { 371 err = -ENODEV; 372 goto out_unlock; 373 } 374 } 375 376 /* ipv4 addr of the socket is invalid. Only the 377 * unspecified and mapped address have a v4 equivalent. 378 */ 379 v4addr = LOOPBACK4_IPV6; 380 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 381 if (!ipv6_can_nonlocal_bind(net, inet) && 382 !ipv6_chk_addr(net, &addr->sin6_addr, 383 dev, 0)) { 384 err = -EADDRNOTAVAIL; 385 goto out_unlock; 386 } 387 } 388 rcu_read_unlock(); 389 } 390 } 391 392 inet->inet_rcv_saddr = v4addr; 393 inet->inet_saddr = v4addr; 394 395 sk->sk_v6_rcv_saddr = addr->sin6_addr; 396 397 if (!(addr_type & IPV6_ADDR_MULTICAST)) 398 np->saddr = addr->sin6_addr; 399 400 saved_ipv6only = sk->sk_ipv6only; 401 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED) 402 sk->sk_ipv6only = 1; 403 404 /* Make sure we are allowed to bind here. */ 405 if (snum || !(inet->bind_address_no_port || 406 force_bind_address_no_port)) { 407 if (sk->sk_prot->get_port(sk, snum)) { 408 sk->sk_ipv6only = saved_ipv6only; 409 inet_reset_saddr(sk); 410 err = -EADDRINUSE; 411 goto out; 412 } 413 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk); 414 if (err) { 415 sk->sk_ipv6only = saved_ipv6only; 416 inet_reset_saddr(sk); 417 goto out; 418 } 419 } 420 421 if (addr_type != IPV6_ADDR_ANY) 422 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 423 if (snum) 424 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 425 inet->inet_sport = htons(inet->inet_num); 426 inet->inet_dport = 0; 427 inet->inet_daddr = 0; 428 out: 429 if (with_lock) 430 release_sock(sk); 431 return err; 432 out_unlock: 433 rcu_read_unlock(); 434 goto out; 435 } 436 437 /* bind for INET6 API */ 438 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 439 { 440 struct sock *sk = sock->sk; 441 int err = 0; 442 443 /* If the socket has its own bind function then use it. */ 444 if (sk->sk_prot->bind) 445 return sk->sk_prot->bind(sk, uaddr, addr_len); 446 447 if (addr_len < SIN6_LEN_RFC2133) 448 return -EINVAL; 449 450 /* BPF prog is run before any checks are done so that if the prog 451 * changes context in a wrong way it will be caught. 452 */ 453 err = BPF_CGROUP_RUN_PROG_INET6_BIND(sk, uaddr); 454 if (err) 455 return err; 456 457 return __inet6_bind(sk, uaddr, addr_len, false, true); 458 } 459 EXPORT_SYMBOL(inet6_bind); 460 461 int inet6_release(struct socket *sock) 462 { 463 struct sock *sk = sock->sk; 464 465 if (!sk) 466 return -EINVAL; 467 468 /* Free mc lists */ 469 ipv6_sock_mc_close(sk); 470 471 /* Free ac lists */ 472 ipv6_sock_ac_close(sk); 473 474 return inet_release(sock); 475 } 476 EXPORT_SYMBOL(inet6_release); 477 478 void inet6_destroy_sock(struct sock *sk) 479 { 480 struct ipv6_pinfo *np = inet6_sk(sk); 481 struct sk_buff *skb; 482 struct ipv6_txoptions *opt; 483 484 /* Release rx options */ 485 486 skb = xchg(&np->pktoptions, NULL); 487 kfree_skb(skb); 488 489 skb = xchg(&np->rxpmtu, NULL); 490 kfree_skb(skb); 491 492 /* Free flowlabels */ 493 fl6_free_socklist(sk); 494 495 /* Free tx options */ 496 497 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 498 if (opt) { 499 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 500 txopt_put(opt); 501 } 502 } 503 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 504 505 /* 506 * This does both peername and sockname. 507 */ 508 509 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 510 int peer) 511 { 512 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 513 struct sock *sk = sock->sk; 514 struct inet_sock *inet = inet_sk(sk); 515 struct ipv6_pinfo *np = inet6_sk(sk); 516 517 sin->sin6_family = AF_INET6; 518 sin->sin6_flowinfo = 0; 519 sin->sin6_scope_id = 0; 520 if (peer) { 521 if (!inet->inet_dport) 522 return -ENOTCONN; 523 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 524 peer == 1) 525 return -ENOTCONN; 526 sin->sin6_port = inet->inet_dport; 527 sin->sin6_addr = sk->sk_v6_daddr; 528 if (np->sndflow) 529 sin->sin6_flowinfo = np->flow_label; 530 } else { 531 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 532 sin->sin6_addr = np->saddr; 533 else 534 sin->sin6_addr = sk->sk_v6_rcv_saddr; 535 536 sin->sin6_port = inet->inet_sport; 537 } 538 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 539 sk->sk_bound_dev_if); 540 return sizeof(*sin); 541 } 542 EXPORT_SYMBOL(inet6_getname); 543 544 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 545 { 546 struct sock *sk = sock->sk; 547 struct net *net = sock_net(sk); 548 549 switch (cmd) { 550 case SIOCADDRT: 551 case SIOCDELRT: 552 553 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 554 555 case SIOCSIFADDR: 556 return addrconf_add_ifaddr(net, (void __user *) arg); 557 case SIOCDIFADDR: 558 return addrconf_del_ifaddr(net, (void __user *) arg); 559 case SIOCSIFDSTADDR: 560 return addrconf_set_dstaddr(net, (void __user *) arg); 561 default: 562 if (!sk->sk_prot->ioctl) 563 return -ENOIOCTLCMD; 564 return sk->sk_prot->ioctl(sk, cmd, arg); 565 } 566 /*NOTREACHED*/ 567 return 0; 568 } 569 EXPORT_SYMBOL(inet6_ioctl); 570 571 const struct proto_ops inet6_stream_ops = { 572 .family = PF_INET6, 573 .owner = THIS_MODULE, 574 .release = inet6_release, 575 .bind = inet6_bind, 576 .connect = inet_stream_connect, /* ok */ 577 .socketpair = sock_no_socketpair, /* a do nothing */ 578 .accept = inet_accept, /* ok */ 579 .getname = inet6_getname, 580 .poll = tcp_poll, /* ok */ 581 .ioctl = inet6_ioctl, /* must change */ 582 .gettstamp = sock_gettstamp, 583 .listen = inet_listen, /* ok */ 584 .shutdown = inet_shutdown, /* ok */ 585 .setsockopt = sock_common_setsockopt, /* ok */ 586 .getsockopt = sock_common_getsockopt, /* ok */ 587 .sendmsg = inet_sendmsg, /* ok */ 588 .recvmsg = inet_recvmsg, /* ok */ 589 #ifdef CONFIG_MMU 590 .mmap = tcp_mmap, 591 #endif 592 .sendpage = inet_sendpage, 593 .sendmsg_locked = tcp_sendmsg_locked, 594 .sendpage_locked = tcp_sendpage_locked, 595 .splice_read = tcp_splice_read, 596 .read_sock = tcp_read_sock, 597 .peek_len = tcp_peek_len, 598 #ifdef CONFIG_COMPAT 599 .compat_setsockopt = compat_sock_common_setsockopt, 600 .compat_getsockopt = compat_sock_common_getsockopt, 601 #endif 602 .set_rcvlowat = tcp_set_rcvlowat, 603 }; 604 605 const struct proto_ops inet6_dgram_ops = { 606 .family = PF_INET6, 607 .owner = THIS_MODULE, 608 .release = inet6_release, 609 .bind = inet6_bind, 610 .connect = inet_dgram_connect, /* ok */ 611 .socketpair = sock_no_socketpair, /* a do nothing */ 612 .accept = sock_no_accept, /* a do nothing */ 613 .getname = inet6_getname, 614 .poll = udp_poll, /* ok */ 615 .ioctl = inet6_ioctl, /* must change */ 616 .gettstamp = sock_gettstamp, 617 .listen = sock_no_listen, /* ok */ 618 .shutdown = inet_shutdown, /* ok */ 619 .setsockopt = sock_common_setsockopt, /* ok */ 620 .getsockopt = sock_common_getsockopt, /* ok */ 621 .sendmsg = inet_sendmsg, /* ok */ 622 .recvmsg = inet_recvmsg, /* ok */ 623 .mmap = sock_no_mmap, 624 .sendpage = sock_no_sendpage, 625 .set_peek_off = sk_set_peek_off, 626 #ifdef CONFIG_COMPAT 627 .compat_setsockopt = compat_sock_common_setsockopt, 628 .compat_getsockopt = compat_sock_common_getsockopt, 629 #endif 630 }; 631 632 static const struct net_proto_family inet6_family_ops = { 633 .family = PF_INET6, 634 .create = inet6_create, 635 .owner = THIS_MODULE, 636 }; 637 638 int inet6_register_protosw(struct inet_protosw *p) 639 { 640 struct list_head *lh; 641 struct inet_protosw *answer; 642 struct list_head *last_perm; 643 int protocol = p->protocol; 644 int ret; 645 646 spin_lock_bh(&inetsw6_lock); 647 648 ret = -EINVAL; 649 if (p->type >= SOCK_MAX) 650 goto out_illegal; 651 652 /* If we are trying to override a permanent protocol, bail. */ 653 answer = NULL; 654 ret = -EPERM; 655 last_perm = &inetsw6[p->type]; 656 list_for_each(lh, &inetsw6[p->type]) { 657 answer = list_entry(lh, struct inet_protosw, list); 658 659 /* Check only the non-wild match. */ 660 if (INET_PROTOSW_PERMANENT & answer->flags) { 661 if (protocol == answer->protocol) 662 break; 663 last_perm = lh; 664 } 665 666 answer = NULL; 667 } 668 if (answer) 669 goto out_permanent; 670 671 /* Add the new entry after the last permanent entry if any, so that 672 * the new entry does not override a permanent entry when matched with 673 * a wild-card protocol. But it is allowed to override any existing 674 * non-permanent entry. This means that when we remove this entry, the 675 * system automatically returns to the old behavior. 676 */ 677 list_add_rcu(&p->list, last_perm); 678 ret = 0; 679 out: 680 spin_unlock_bh(&inetsw6_lock); 681 return ret; 682 683 out_permanent: 684 pr_err("Attempt to override permanent protocol %d\n", protocol); 685 goto out; 686 687 out_illegal: 688 pr_err("Ignoring attempt to register invalid socket type %d\n", 689 p->type); 690 goto out; 691 } 692 EXPORT_SYMBOL(inet6_register_protosw); 693 694 void 695 inet6_unregister_protosw(struct inet_protosw *p) 696 { 697 if (INET_PROTOSW_PERMANENT & p->flags) { 698 pr_err("Attempt to unregister permanent protocol %d\n", 699 p->protocol); 700 } else { 701 spin_lock_bh(&inetsw6_lock); 702 list_del_rcu(&p->list); 703 spin_unlock_bh(&inetsw6_lock); 704 705 synchronize_net(); 706 } 707 } 708 EXPORT_SYMBOL(inet6_unregister_protosw); 709 710 int inet6_sk_rebuild_header(struct sock *sk) 711 { 712 struct ipv6_pinfo *np = inet6_sk(sk); 713 struct dst_entry *dst; 714 715 dst = __sk_dst_check(sk, np->dst_cookie); 716 717 if (!dst) { 718 struct inet_sock *inet = inet_sk(sk); 719 struct in6_addr *final_p, final; 720 struct flowi6 fl6; 721 722 memset(&fl6, 0, sizeof(fl6)); 723 fl6.flowi6_proto = sk->sk_protocol; 724 fl6.daddr = sk->sk_v6_daddr; 725 fl6.saddr = np->saddr; 726 fl6.flowlabel = np->flow_label; 727 fl6.flowi6_oif = sk->sk_bound_dev_if; 728 fl6.flowi6_mark = sk->sk_mark; 729 fl6.fl6_dport = inet->inet_dport; 730 fl6.fl6_sport = inet->inet_sport; 731 fl6.flowi6_uid = sk->sk_uid; 732 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 733 734 rcu_read_lock(); 735 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 736 &final); 737 rcu_read_unlock(); 738 739 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 740 if (IS_ERR(dst)) { 741 sk->sk_route_caps = 0; 742 sk->sk_err_soft = -PTR_ERR(dst); 743 return PTR_ERR(dst); 744 } 745 746 ip6_dst_store(sk, dst, NULL, NULL); 747 } 748 749 return 0; 750 } 751 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 752 753 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 754 const struct inet6_skb_parm *opt) 755 { 756 const struct ipv6_pinfo *np = inet6_sk(sk); 757 758 if (np->rxopt.all) { 759 if (((opt->flags & IP6SKB_HOPBYHOP) && 760 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 761 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 762 np->rxopt.bits.rxflow) || 763 (opt->srcrt && (np->rxopt.bits.srcrt || 764 np->rxopt.bits.osrcrt)) || 765 ((opt->dst1 || opt->dst0) && 766 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 767 return true; 768 } 769 return false; 770 } 771 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 772 773 static struct packet_type ipv6_packet_type __read_mostly = { 774 .type = cpu_to_be16(ETH_P_IPV6), 775 .func = ipv6_rcv, 776 .list_func = ipv6_list_rcv, 777 }; 778 779 static int __init ipv6_packet_init(void) 780 { 781 dev_add_pack(&ipv6_packet_type); 782 return 0; 783 } 784 785 static void ipv6_packet_cleanup(void) 786 { 787 dev_remove_pack(&ipv6_packet_type); 788 } 789 790 static int __net_init ipv6_init_mibs(struct net *net) 791 { 792 int i; 793 794 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 795 if (!net->mib.udp_stats_in6) 796 return -ENOMEM; 797 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 798 if (!net->mib.udplite_stats_in6) 799 goto err_udplite_mib; 800 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 801 if (!net->mib.ipv6_statistics) 802 goto err_ip_mib; 803 804 for_each_possible_cpu(i) { 805 struct ipstats_mib *af_inet6_stats; 806 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 807 u64_stats_init(&af_inet6_stats->syncp); 808 } 809 810 811 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 812 if (!net->mib.icmpv6_statistics) 813 goto err_icmp_mib; 814 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 815 GFP_KERNEL); 816 if (!net->mib.icmpv6msg_statistics) 817 goto err_icmpmsg_mib; 818 return 0; 819 820 err_icmpmsg_mib: 821 free_percpu(net->mib.icmpv6_statistics); 822 err_icmp_mib: 823 free_percpu(net->mib.ipv6_statistics); 824 err_ip_mib: 825 free_percpu(net->mib.udplite_stats_in6); 826 err_udplite_mib: 827 free_percpu(net->mib.udp_stats_in6); 828 return -ENOMEM; 829 } 830 831 static void ipv6_cleanup_mibs(struct net *net) 832 { 833 free_percpu(net->mib.udp_stats_in6); 834 free_percpu(net->mib.udplite_stats_in6); 835 free_percpu(net->mib.ipv6_statistics); 836 free_percpu(net->mib.icmpv6_statistics); 837 kfree(net->mib.icmpv6msg_statistics); 838 } 839 840 static int __net_init inet6_net_init(struct net *net) 841 { 842 int err = 0; 843 844 net->ipv6.sysctl.bindv6only = 0; 845 net->ipv6.sysctl.icmpv6_time = 1*HZ; 846 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0; 847 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0; 848 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0; 849 850 /* By default, rate limit error messages. 851 * Except for pmtu discovery, it would break it. 852 * proc_do_large_bitmap needs pointer to the bitmap. 853 */ 854 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1); 855 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1); 856 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask; 857 858 net->ipv6.sysctl.flowlabel_consistency = 1; 859 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 860 net->ipv6.sysctl.idgen_retries = 3; 861 net->ipv6.sysctl.idgen_delay = 1 * HZ; 862 net->ipv6.sysctl.flowlabel_state_ranges = 0; 863 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 864 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 865 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 866 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 867 atomic_set(&net->ipv6.fib6_sernum, 1); 868 869 err = ipv6_init_mibs(net); 870 if (err) 871 return err; 872 #ifdef CONFIG_PROC_FS 873 err = udp6_proc_init(net); 874 if (err) 875 goto out; 876 err = tcp6_proc_init(net); 877 if (err) 878 goto proc_tcp6_fail; 879 err = ac6_proc_init(net); 880 if (err) 881 goto proc_ac6_fail; 882 #endif 883 return err; 884 885 #ifdef CONFIG_PROC_FS 886 proc_ac6_fail: 887 tcp6_proc_exit(net); 888 proc_tcp6_fail: 889 udp6_proc_exit(net); 890 out: 891 ipv6_cleanup_mibs(net); 892 return err; 893 #endif 894 } 895 896 static void __net_exit inet6_net_exit(struct net *net) 897 { 898 #ifdef CONFIG_PROC_FS 899 udp6_proc_exit(net); 900 tcp6_proc_exit(net); 901 ac6_proc_exit(net); 902 #endif 903 ipv6_cleanup_mibs(net); 904 } 905 906 static struct pernet_operations inet6_net_ops = { 907 .init = inet6_net_init, 908 .exit = inet6_net_exit, 909 }; 910 911 static int ipv6_route_input(struct sk_buff *skb) 912 { 913 ip6_route_input(skb); 914 return skb_dst(skb)->error; 915 } 916 917 static const struct ipv6_stub ipv6_stub_impl = { 918 .ipv6_sock_mc_join = ipv6_sock_mc_join, 919 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 920 .ipv6_dst_lookup = ip6_dst_lookup, 921 .ipv6_route_input = ipv6_route_input, 922 .fib6_get_table = fib6_get_table, 923 .fib6_table_lookup = fib6_table_lookup, 924 .fib6_lookup = fib6_lookup, 925 .fib6_select_path = fib6_select_path, 926 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6, 927 .fib6_nh_init = fib6_nh_init, 928 .fib6_nh_release = fib6_nh_release, 929 .udpv6_encap_enable = udpv6_encap_enable, 930 .ndisc_send_na = ndisc_send_na, 931 .nd_tbl = &nd_tbl, 932 }; 933 934 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = { 935 .inet6_bind = __inet6_bind, 936 .udp6_lib_lookup = __udp6_lib_lookup, 937 }; 938 939 static int __init inet6_init(void) 940 { 941 struct list_head *r; 942 int err = 0; 943 944 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 945 946 /* Register the socket-side information for inet6_create. */ 947 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 948 INIT_LIST_HEAD(r); 949 950 if (disable_ipv6_mod) { 951 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 952 goto out; 953 } 954 955 err = proto_register(&tcpv6_prot, 1); 956 if (err) 957 goto out; 958 959 err = proto_register(&udpv6_prot, 1); 960 if (err) 961 goto out_unregister_tcp_proto; 962 963 err = proto_register(&udplitev6_prot, 1); 964 if (err) 965 goto out_unregister_udp_proto; 966 967 err = proto_register(&rawv6_prot, 1); 968 if (err) 969 goto out_unregister_udplite_proto; 970 971 err = proto_register(&pingv6_prot, 1); 972 if (err) 973 goto out_unregister_raw_proto; 974 975 /* We MUST register RAW sockets before we create the ICMP6, 976 * IGMP6, or NDISC control sockets. 977 */ 978 err = rawv6_init(); 979 if (err) 980 goto out_unregister_ping_proto; 981 982 /* Register the family here so that the init calls below will 983 * be able to create sockets. (?? is this dangerous ??) 984 */ 985 err = sock_register(&inet6_family_ops); 986 if (err) 987 goto out_sock_register_fail; 988 989 /* 990 * ipngwg API draft makes clear that the correct semantics 991 * for TCP and UDP is to consider one TCP and UDP instance 992 * in a host available by both INET and INET6 APIs and 993 * able to communicate via both network protocols. 994 */ 995 996 err = register_pernet_subsys(&inet6_net_ops); 997 if (err) 998 goto register_pernet_fail; 999 err = ip6_mr_init(); 1000 if (err) 1001 goto ipmr_fail; 1002 err = icmpv6_init(); 1003 if (err) 1004 goto icmp_fail; 1005 err = ndisc_init(); 1006 if (err) 1007 goto ndisc_fail; 1008 err = igmp6_init(); 1009 if (err) 1010 goto igmp_fail; 1011 1012 err = ipv6_netfilter_init(); 1013 if (err) 1014 goto netfilter_fail; 1015 /* Create /proc/foo6 entries. */ 1016 #ifdef CONFIG_PROC_FS 1017 err = -ENOMEM; 1018 if (raw6_proc_init()) 1019 goto proc_raw6_fail; 1020 if (udplite6_proc_init()) 1021 goto proc_udplite6_fail; 1022 if (ipv6_misc_proc_init()) 1023 goto proc_misc6_fail; 1024 if (if6_proc_init()) 1025 goto proc_if6_fail; 1026 #endif 1027 err = ip6_route_init(); 1028 if (err) 1029 goto ip6_route_fail; 1030 err = ndisc_late_init(); 1031 if (err) 1032 goto ndisc_late_fail; 1033 err = ip6_flowlabel_init(); 1034 if (err) 1035 goto ip6_flowlabel_fail; 1036 err = ipv6_anycast_init(); 1037 if (err) 1038 goto ipv6_anycast_fail; 1039 err = addrconf_init(); 1040 if (err) 1041 goto addrconf_fail; 1042 1043 /* Init v6 extension headers. */ 1044 err = ipv6_exthdrs_init(); 1045 if (err) 1046 goto ipv6_exthdrs_fail; 1047 1048 err = ipv6_frag_init(); 1049 if (err) 1050 goto ipv6_frag_fail; 1051 1052 /* Init v6 transport protocols. */ 1053 err = udpv6_init(); 1054 if (err) 1055 goto udpv6_fail; 1056 1057 err = udplitev6_init(); 1058 if (err) 1059 goto udplitev6_fail; 1060 1061 err = udpv6_offload_init(); 1062 if (err) 1063 goto udpv6_offload_fail; 1064 1065 err = tcpv6_init(); 1066 if (err) 1067 goto tcpv6_fail; 1068 1069 err = ipv6_packet_init(); 1070 if (err) 1071 goto ipv6_packet_fail; 1072 1073 err = pingv6_init(); 1074 if (err) 1075 goto pingv6_fail; 1076 1077 err = calipso_init(); 1078 if (err) 1079 goto calipso_fail; 1080 1081 err = seg6_init(); 1082 if (err) 1083 goto seg6_fail; 1084 1085 err = igmp6_late_init(); 1086 if (err) 1087 goto igmp6_late_err; 1088 1089 #ifdef CONFIG_SYSCTL 1090 err = ipv6_sysctl_register(); 1091 if (err) 1092 goto sysctl_fail; 1093 #endif 1094 1095 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1096 wmb(); 1097 ipv6_stub = &ipv6_stub_impl; 1098 ipv6_bpf_stub = &ipv6_bpf_stub_impl; 1099 out: 1100 return err; 1101 1102 #ifdef CONFIG_SYSCTL 1103 sysctl_fail: 1104 igmp6_late_cleanup(); 1105 #endif 1106 igmp6_late_err: 1107 seg6_exit(); 1108 seg6_fail: 1109 calipso_exit(); 1110 calipso_fail: 1111 pingv6_exit(); 1112 pingv6_fail: 1113 ipv6_packet_cleanup(); 1114 ipv6_packet_fail: 1115 tcpv6_exit(); 1116 tcpv6_fail: 1117 udpv6_offload_exit(); 1118 udpv6_offload_fail: 1119 udplitev6_exit(); 1120 udplitev6_fail: 1121 udpv6_exit(); 1122 udpv6_fail: 1123 ipv6_frag_exit(); 1124 ipv6_frag_fail: 1125 ipv6_exthdrs_exit(); 1126 ipv6_exthdrs_fail: 1127 addrconf_cleanup(); 1128 addrconf_fail: 1129 ipv6_anycast_cleanup(); 1130 ipv6_anycast_fail: 1131 ip6_flowlabel_cleanup(); 1132 ip6_flowlabel_fail: 1133 ndisc_late_cleanup(); 1134 ndisc_late_fail: 1135 ip6_route_cleanup(); 1136 ip6_route_fail: 1137 #ifdef CONFIG_PROC_FS 1138 if6_proc_exit(); 1139 proc_if6_fail: 1140 ipv6_misc_proc_exit(); 1141 proc_misc6_fail: 1142 udplite6_proc_exit(); 1143 proc_udplite6_fail: 1144 raw6_proc_exit(); 1145 proc_raw6_fail: 1146 #endif 1147 ipv6_netfilter_fini(); 1148 netfilter_fail: 1149 igmp6_cleanup(); 1150 igmp_fail: 1151 ndisc_cleanup(); 1152 ndisc_fail: 1153 icmpv6_cleanup(); 1154 icmp_fail: 1155 ip6_mr_cleanup(); 1156 ipmr_fail: 1157 unregister_pernet_subsys(&inet6_net_ops); 1158 register_pernet_fail: 1159 sock_unregister(PF_INET6); 1160 rtnl_unregister_all(PF_INET6); 1161 out_sock_register_fail: 1162 rawv6_exit(); 1163 out_unregister_ping_proto: 1164 proto_unregister(&pingv6_prot); 1165 out_unregister_raw_proto: 1166 proto_unregister(&rawv6_prot); 1167 out_unregister_udplite_proto: 1168 proto_unregister(&udplitev6_prot); 1169 out_unregister_udp_proto: 1170 proto_unregister(&udpv6_prot); 1171 out_unregister_tcp_proto: 1172 proto_unregister(&tcpv6_prot); 1173 goto out; 1174 } 1175 module_init(inet6_init); 1176 1177 MODULE_ALIAS_NETPROTO(PF_INET6); 1178