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->pmtudisc = IPV6_PMTUDISC_WANT; 213 np->repflow = net->ipv6.sysctl.flowlabel_reflect; 214 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 215 216 /* Init the ipv4 part of the socket since we can have sockets 217 * using v6 API for ipv4. 218 */ 219 inet->uc_ttl = -1; 220 221 inet->mc_loop = 1; 222 inet->mc_ttl = 1; 223 inet->mc_index = 0; 224 inet->mc_list = NULL; 225 inet->rcv_tos = 0; 226 227 if (net->ipv4.sysctl_ip_no_pmtu_disc) 228 inet->pmtudisc = IP_PMTUDISC_DONT; 229 else 230 inet->pmtudisc = IP_PMTUDISC_WANT; 231 /* 232 * Increment only the relevant sk_prot->socks debug field, this changes 233 * the previous behaviour of incrementing both the equivalent to 234 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 235 * 236 * This allows better debug granularity as we'll know exactly how many 237 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 238 * transport protocol socks. -acme 239 */ 240 sk_refcnt_debug_inc(sk); 241 242 if (inet->inet_num) { 243 /* It assumes that any protocol which allows 244 * the user to assign a number at socket 245 * creation time automatically shares. 246 */ 247 inet->inet_sport = htons(inet->inet_num); 248 err = sk->sk_prot->hash(sk); 249 if (err) { 250 sk_common_release(sk); 251 goto out; 252 } 253 } 254 if (sk->sk_prot->init) { 255 err = sk->sk_prot->init(sk); 256 if (err) { 257 sk_common_release(sk); 258 goto out; 259 } 260 } 261 262 if (!kern) { 263 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); 264 if (err) { 265 sk_common_release(sk); 266 goto out; 267 } 268 } 269 out: 270 return err; 271 out_rcu_unlock: 272 rcu_read_unlock(); 273 goto out; 274 } 275 276 277 /* bind for INET6 API */ 278 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 279 { 280 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 281 struct sock *sk = sock->sk; 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 int addr_type = 0; 288 int err = 0; 289 290 /* If the socket has its own bind function then use it. */ 291 if (sk->sk_prot->bind) 292 return sk->sk_prot->bind(sk, uaddr, addr_len); 293 294 if (addr_len < SIN6_LEN_RFC2133) 295 return -EINVAL; 296 297 if (addr->sin6_family != AF_INET6) 298 return -EAFNOSUPPORT; 299 300 addr_type = ipv6_addr_type(&addr->sin6_addr); 301 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 302 return -EINVAL; 303 304 snum = ntohs(addr->sin6_port); 305 if (snum && snum < inet_prot_sock(net) && 306 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 307 return -EACCES; 308 309 lock_sock(sk); 310 311 /* Check these errors (active socket, double bind). */ 312 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 313 err = -EINVAL; 314 goto out; 315 } 316 317 /* Check if the address belongs to the host. */ 318 if (addr_type == IPV6_ADDR_MAPPED) { 319 int chk_addr_ret; 320 321 /* Binding to v4-mapped address on a v6-only socket 322 * makes no sense 323 */ 324 if (sk->sk_ipv6only) { 325 err = -EINVAL; 326 goto out; 327 } 328 329 /* Reproduce AF_INET checks to make the bindings consistent */ 330 v4addr = addr->sin6_addr.s6_addr32[3]; 331 chk_addr_ret = inet_addr_type(net, v4addr); 332 if (!net->ipv4.sysctl_ip_nonlocal_bind && 333 !(inet->freebind || inet->transparent) && 334 v4addr != htonl(INADDR_ANY) && 335 chk_addr_ret != RTN_LOCAL && 336 chk_addr_ret != RTN_MULTICAST && 337 chk_addr_ret != RTN_BROADCAST) { 338 err = -EADDRNOTAVAIL; 339 goto out; 340 } 341 } else { 342 if (addr_type != IPV6_ADDR_ANY) { 343 struct net_device *dev = NULL; 344 345 rcu_read_lock(); 346 if (__ipv6_addr_needs_scope_id(addr_type)) { 347 if (addr_len >= sizeof(struct sockaddr_in6) && 348 addr->sin6_scope_id) { 349 /* Override any existing binding, if another one 350 * is supplied by user. 351 */ 352 sk->sk_bound_dev_if = addr->sin6_scope_id; 353 } 354 355 /* Binding to link-local address requires an interface */ 356 if (!sk->sk_bound_dev_if) { 357 err = -EINVAL; 358 goto out_unlock; 359 } 360 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 361 if (!dev) { 362 err = -ENODEV; 363 goto out_unlock; 364 } 365 } 366 367 /* ipv4 addr of the socket is invalid. Only the 368 * unspecified and mapped address have a v4 equivalent. 369 */ 370 v4addr = LOOPBACK4_IPV6; 371 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 372 if (!net->ipv6.sysctl.ip_nonlocal_bind && 373 !(inet->freebind || inet->transparent) && 374 !ipv6_chk_addr(net, &addr->sin6_addr, 375 dev, 0)) { 376 err = -EADDRNOTAVAIL; 377 goto out_unlock; 378 } 379 } 380 rcu_read_unlock(); 381 } 382 } 383 384 inet->inet_rcv_saddr = v4addr; 385 inet->inet_saddr = v4addr; 386 387 sk->sk_v6_rcv_saddr = addr->sin6_addr; 388 389 if (!(addr_type & IPV6_ADDR_MULTICAST)) 390 np->saddr = addr->sin6_addr; 391 392 /* Make sure we are allowed to bind here. */ 393 if ((snum || !inet->bind_address_no_port) && 394 sk->sk_prot->get_port(sk, snum)) { 395 inet_reset_saddr(sk); 396 err = -EADDRINUSE; 397 goto out; 398 } 399 400 if (addr_type != IPV6_ADDR_ANY) { 401 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 402 if (addr_type != IPV6_ADDR_MAPPED) 403 sk->sk_ipv6only = 1; 404 } 405 if (snum) 406 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 407 inet->inet_sport = htons(inet->inet_num); 408 inet->inet_dport = 0; 409 inet->inet_daddr = 0; 410 out: 411 release_sock(sk); 412 return err; 413 out_unlock: 414 rcu_read_unlock(); 415 goto out; 416 } 417 EXPORT_SYMBOL(inet6_bind); 418 419 int inet6_release(struct socket *sock) 420 { 421 struct sock *sk = sock->sk; 422 423 if (!sk) 424 return -EINVAL; 425 426 /* Free mc lists */ 427 ipv6_sock_mc_close(sk); 428 429 /* Free ac lists */ 430 ipv6_sock_ac_close(sk); 431 432 return inet_release(sock); 433 } 434 EXPORT_SYMBOL(inet6_release); 435 436 void inet6_destroy_sock(struct sock *sk) 437 { 438 struct ipv6_pinfo *np = inet6_sk(sk); 439 struct sk_buff *skb; 440 struct ipv6_txoptions *opt; 441 442 /* Release rx options */ 443 444 skb = xchg(&np->pktoptions, NULL); 445 if (skb) 446 kfree_skb(skb); 447 448 skb = xchg(&np->rxpmtu, NULL); 449 if (skb) 450 kfree_skb(skb); 451 452 /* Free flowlabels */ 453 fl6_free_socklist(sk); 454 455 /* Free tx options */ 456 457 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 458 if (opt) { 459 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 460 txopt_put(opt); 461 } 462 } 463 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 464 465 /* 466 * This does both peername and sockname. 467 */ 468 469 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 470 int *uaddr_len, int peer) 471 { 472 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 473 struct sock *sk = sock->sk; 474 struct inet_sock *inet = inet_sk(sk); 475 struct ipv6_pinfo *np = inet6_sk(sk); 476 477 sin->sin6_family = AF_INET6; 478 sin->sin6_flowinfo = 0; 479 sin->sin6_scope_id = 0; 480 if (peer) { 481 if (!inet->inet_dport) 482 return -ENOTCONN; 483 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 484 peer == 1) 485 return -ENOTCONN; 486 sin->sin6_port = inet->inet_dport; 487 sin->sin6_addr = sk->sk_v6_daddr; 488 if (np->sndflow) 489 sin->sin6_flowinfo = np->flow_label; 490 } else { 491 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 492 sin->sin6_addr = np->saddr; 493 else 494 sin->sin6_addr = sk->sk_v6_rcv_saddr; 495 496 sin->sin6_port = inet->inet_sport; 497 } 498 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 499 sk->sk_bound_dev_if); 500 *uaddr_len = sizeof(*sin); 501 return 0; 502 } 503 EXPORT_SYMBOL(inet6_getname); 504 505 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 506 { 507 struct sock *sk = sock->sk; 508 struct net *net = sock_net(sk); 509 510 switch (cmd) { 511 case SIOCGSTAMP: 512 return sock_get_timestamp(sk, (struct timeval __user *)arg); 513 514 case SIOCGSTAMPNS: 515 return sock_get_timestampns(sk, (struct timespec __user *)arg); 516 517 case SIOCADDRT: 518 case SIOCDELRT: 519 520 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 521 522 case SIOCSIFADDR: 523 return addrconf_add_ifaddr(net, (void __user *) arg); 524 case SIOCDIFADDR: 525 return addrconf_del_ifaddr(net, (void __user *) arg); 526 case SIOCSIFDSTADDR: 527 return addrconf_set_dstaddr(net, (void __user *) arg); 528 default: 529 if (!sk->sk_prot->ioctl) 530 return -ENOIOCTLCMD; 531 return sk->sk_prot->ioctl(sk, cmd, arg); 532 } 533 /*NOTREACHED*/ 534 return 0; 535 } 536 EXPORT_SYMBOL(inet6_ioctl); 537 538 const struct proto_ops inet6_stream_ops = { 539 .family = PF_INET6, 540 .owner = THIS_MODULE, 541 .release = inet6_release, 542 .bind = inet6_bind, 543 .connect = inet_stream_connect, /* ok */ 544 .socketpair = sock_no_socketpair, /* a do nothing */ 545 .accept = inet_accept, /* ok */ 546 .getname = inet6_getname, 547 .poll = tcp_poll, /* ok */ 548 .ioctl = inet6_ioctl, /* must change */ 549 .listen = inet_listen, /* ok */ 550 .shutdown = inet_shutdown, /* ok */ 551 .setsockopt = sock_common_setsockopt, /* ok */ 552 .getsockopt = sock_common_getsockopt, /* ok */ 553 .sendmsg = inet_sendmsg, /* ok */ 554 .recvmsg = inet_recvmsg, /* ok */ 555 .mmap = sock_no_mmap, 556 .sendpage = inet_sendpage, 557 .sendmsg_locked = tcp_sendmsg_locked, 558 .sendpage_locked = tcp_sendpage_locked, 559 .splice_read = tcp_splice_read, 560 .read_sock = tcp_read_sock, 561 .peek_len = tcp_peek_len, 562 #ifdef CONFIG_COMPAT 563 .compat_setsockopt = compat_sock_common_setsockopt, 564 .compat_getsockopt = compat_sock_common_getsockopt, 565 #endif 566 }; 567 568 const struct proto_ops inet6_dgram_ops = { 569 .family = PF_INET6, 570 .owner = THIS_MODULE, 571 .release = inet6_release, 572 .bind = inet6_bind, 573 .connect = inet_dgram_connect, /* ok */ 574 .socketpair = sock_no_socketpair, /* a do nothing */ 575 .accept = sock_no_accept, /* a do nothing */ 576 .getname = inet6_getname, 577 .poll = udp_poll, /* ok */ 578 .ioctl = inet6_ioctl, /* must change */ 579 .listen = sock_no_listen, /* ok */ 580 .shutdown = inet_shutdown, /* ok */ 581 .setsockopt = sock_common_setsockopt, /* ok */ 582 .getsockopt = sock_common_getsockopt, /* ok */ 583 .sendmsg = inet_sendmsg, /* ok */ 584 .recvmsg = inet_recvmsg, /* ok */ 585 .mmap = sock_no_mmap, 586 .sendpage = sock_no_sendpage, 587 .set_peek_off = sk_set_peek_off, 588 #ifdef CONFIG_COMPAT 589 .compat_setsockopt = compat_sock_common_setsockopt, 590 .compat_getsockopt = compat_sock_common_getsockopt, 591 #endif 592 }; 593 594 static const struct net_proto_family inet6_family_ops = { 595 .family = PF_INET6, 596 .create = inet6_create, 597 .owner = THIS_MODULE, 598 }; 599 600 int inet6_register_protosw(struct inet_protosw *p) 601 { 602 struct list_head *lh; 603 struct inet_protosw *answer; 604 struct list_head *last_perm; 605 int protocol = p->protocol; 606 int ret; 607 608 spin_lock_bh(&inetsw6_lock); 609 610 ret = -EINVAL; 611 if (p->type >= SOCK_MAX) 612 goto out_illegal; 613 614 /* If we are trying to override a permanent protocol, bail. */ 615 answer = NULL; 616 ret = -EPERM; 617 last_perm = &inetsw6[p->type]; 618 list_for_each(lh, &inetsw6[p->type]) { 619 answer = list_entry(lh, struct inet_protosw, list); 620 621 /* Check only the non-wild match. */ 622 if (INET_PROTOSW_PERMANENT & answer->flags) { 623 if (protocol == answer->protocol) 624 break; 625 last_perm = lh; 626 } 627 628 answer = NULL; 629 } 630 if (answer) 631 goto out_permanent; 632 633 /* Add the new entry after the last permanent entry if any, so that 634 * the new entry does not override a permanent entry when matched with 635 * a wild-card protocol. But it is allowed to override any existing 636 * non-permanent entry. This means that when we remove this entry, the 637 * system automatically returns to the old behavior. 638 */ 639 list_add_rcu(&p->list, last_perm); 640 ret = 0; 641 out: 642 spin_unlock_bh(&inetsw6_lock); 643 return ret; 644 645 out_permanent: 646 pr_err("Attempt to override permanent protocol %d\n", protocol); 647 goto out; 648 649 out_illegal: 650 pr_err("Ignoring attempt to register invalid socket type %d\n", 651 p->type); 652 goto out; 653 } 654 EXPORT_SYMBOL(inet6_register_protosw); 655 656 void 657 inet6_unregister_protosw(struct inet_protosw *p) 658 { 659 if (INET_PROTOSW_PERMANENT & p->flags) { 660 pr_err("Attempt to unregister permanent protocol %d\n", 661 p->protocol); 662 } else { 663 spin_lock_bh(&inetsw6_lock); 664 list_del_rcu(&p->list); 665 spin_unlock_bh(&inetsw6_lock); 666 667 synchronize_net(); 668 } 669 } 670 EXPORT_SYMBOL(inet6_unregister_protosw); 671 672 int inet6_sk_rebuild_header(struct sock *sk) 673 { 674 struct ipv6_pinfo *np = inet6_sk(sk); 675 struct dst_entry *dst; 676 677 dst = __sk_dst_check(sk, np->dst_cookie); 678 679 if (!dst) { 680 struct inet_sock *inet = inet_sk(sk); 681 struct in6_addr *final_p, final; 682 struct flowi6 fl6; 683 684 memset(&fl6, 0, sizeof(fl6)); 685 fl6.flowi6_proto = sk->sk_protocol; 686 fl6.daddr = sk->sk_v6_daddr; 687 fl6.saddr = np->saddr; 688 fl6.flowlabel = np->flow_label; 689 fl6.flowi6_oif = sk->sk_bound_dev_if; 690 fl6.flowi6_mark = sk->sk_mark; 691 fl6.fl6_dport = inet->inet_dport; 692 fl6.fl6_sport = inet->inet_sport; 693 fl6.flowi6_uid = sk->sk_uid; 694 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 695 696 rcu_read_lock(); 697 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 698 &final); 699 rcu_read_unlock(); 700 701 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 702 if (IS_ERR(dst)) { 703 sk->sk_route_caps = 0; 704 sk->sk_err_soft = -PTR_ERR(dst); 705 return PTR_ERR(dst); 706 } 707 708 ip6_dst_store(sk, dst, NULL, NULL); 709 } 710 711 return 0; 712 } 713 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 714 715 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 716 const struct inet6_skb_parm *opt) 717 { 718 const struct ipv6_pinfo *np = inet6_sk(sk); 719 720 if (np->rxopt.all) { 721 if (((opt->flags & IP6SKB_HOPBYHOP) && 722 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 723 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 724 np->rxopt.bits.rxflow) || 725 (opt->srcrt && (np->rxopt.bits.srcrt || 726 np->rxopt.bits.osrcrt)) || 727 ((opt->dst1 || opt->dst0) && 728 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 729 return true; 730 } 731 return false; 732 } 733 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 734 735 static struct packet_type ipv6_packet_type __read_mostly = { 736 .type = cpu_to_be16(ETH_P_IPV6), 737 .func = ipv6_rcv, 738 }; 739 740 static int __init ipv6_packet_init(void) 741 { 742 dev_add_pack(&ipv6_packet_type); 743 return 0; 744 } 745 746 static void ipv6_packet_cleanup(void) 747 { 748 dev_remove_pack(&ipv6_packet_type); 749 } 750 751 static int __net_init ipv6_init_mibs(struct net *net) 752 { 753 int i; 754 755 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 756 if (!net->mib.udp_stats_in6) 757 return -ENOMEM; 758 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 759 if (!net->mib.udplite_stats_in6) 760 goto err_udplite_mib; 761 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 762 if (!net->mib.ipv6_statistics) 763 goto err_ip_mib; 764 765 for_each_possible_cpu(i) { 766 struct ipstats_mib *af_inet6_stats; 767 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 768 u64_stats_init(&af_inet6_stats->syncp); 769 } 770 771 772 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 773 if (!net->mib.icmpv6_statistics) 774 goto err_icmp_mib; 775 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 776 GFP_KERNEL); 777 if (!net->mib.icmpv6msg_statistics) 778 goto err_icmpmsg_mib; 779 return 0; 780 781 err_icmpmsg_mib: 782 free_percpu(net->mib.icmpv6_statistics); 783 err_icmp_mib: 784 free_percpu(net->mib.ipv6_statistics); 785 err_ip_mib: 786 free_percpu(net->mib.udplite_stats_in6); 787 err_udplite_mib: 788 free_percpu(net->mib.udp_stats_in6); 789 return -ENOMEM; 790 } 791 792 static void ipv6_cleanup_mibs(struct net *net) 793 { 794 free_percpu(net->mib.udp_stats_in6); 795 free_percpu(net->mib.udplite_stats_in6); 796 free_percpu(net->mib.ipv6_statistics); 797 free_percpu(net->mib.icmpv6_statistics); 798 kfree(net->mib.icmpv6msg_statistics); 799 } 800 801 static int __net_init inet6_net_init(struct net *net) 802 { 803 int err = 0; 804 805 net->ipv6.sysctl.bindv6only = 0; 806 net->ipv6.sysctl.icmpv6_time = 1*HZ; 807 net->ipv6.sysctl.flowlabel_consistency = 1; 808 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 809 net->ipv6.sysctl.idgen_retries = 3; 810 net->ipv6.sysctl.idgen_delay = 1 * HZ; 811 net->ipv6.sysctl.flowlabel_state_ranges = 0; 812 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 813 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 814 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 815 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 816 atomic_set(&net->ipv6.fib6_sernum, 1); 817 818 err = ipv6_init_mibs(net); 819 if (err) 820 return err; 821 #ifdef CONFIG_PROC_FS 822 err = udp6_proc_init(net); 823 if (err) 824 goto out; 825 err = tcp6_proc_init(net); 826 if (err) 827 goto proc_tcp6_fail; 828 err = ac6_proc_init(net); 829 if (err) 830 goto proc_ac6_fail; 831 #endif 832 return err; 833 834 #ifdef CONFIG_PROC_FS 835 proc_ac6_fail: 836 tcp6_proc_exit(net); 837 proc_tcp6_fail: 838 udp6_proc_exit(net); 839 out: 840 ipv6_cleanup_mibs(net); 841 return err; 842 #endif 843 } 844 845 static void __net_exit inet6_net_exit(struct net *net) 846 { 847 #ifdef CONFIG_PROC_FS 848 udp6_proc_exit(net); 849 tcp6_proc_exit(net); 850 ac6_proc_exit(net); 851 #endif 852 ipv6_cleanup_mibs(net); 853 } 854 855 static struct pernet_operations inet6_net_ops = { 856 .init = inet6_net_init, 857 .exit = inet6_net_exit, 858 }; 859 860 static const struct ipv6_stub ipv6_stub_impl = { 861 .ipv6_sock_mc_join = ipv6_sock_mc_join, 862 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 863 .ipv6_dst_lookup = ip6_dst_lookup, 864 .udpv6_encap_enable = udpv6_encap_enable, 865 .ndisc_send_na = ndisc_send_na, 866 .nd_tbl = &nd_tbl, 867 }; 868 869 static int __init inet6_init(void) 870 { 871 struct list_head *r; 872 int err = 0; 873 874 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 875 876 /* Register the socket-side information for inet6_create. */ 877 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 878 INIT_LIST_HEAD(r); 879 880 if (disable_ipv6_mod) { 881 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 882 goto out; 883 } 884 885 err = proto_register(&tcpv6_prot, 1); 886 if (err) 887 goto out; 888 889 err = proto_register(&udpv6_prot, 1); 890 if (err) 891 goto out_unregister_tcp_proto; 892 893 err = proto_register(&udplitev6_prot, 1); 894 if (err) 895 goto out_unregister_udp_proto; 896 897 err = proto_register(&rawv6_prot, 1); 898 if (err) 899 goto out_unregister_udplite_proto; 900 901 err = proto_register(&pingv6_prot, 1); 902 if (err) 903 goto out_unregister_ping_proto; 904 905 /* We MUST register RAW sockets before we create the ICMP6, 906 * IGMP6, or NDISC control sockets. 907 */ 908 err = rawv6_init(); 909 if (err) 910 goto out_unregister_raw_proto; 911 912 /* Register the family here so that the init calls below will 913 * be able to create sockets. (?? is this dangerous ??) 914 */ 915 err = sock_register(&inet6_family_ops); 916 if (err) 917 goto out_sock_register_fail; 918 919 /* 920 * ipngwg API draft makes clear that the correct semantics 921 * for TCP and UDP is to consider one TCP and UDP instance 922 * in a host available by both INET and INET6 APIs and 923 * able to communicate via both network protocols. 924 */ 925 926 err = register_pernet_subsys(&inet6_net_ops); 927 if (err) 928 goto register_pernet_fail; 929 err = ip6_mr_init(); 930 if (err) 931 goto ipmr_fail; 932 err = icmpv6_init(); 933 if (err) 934 goto icmp_fail; 935 err = ndisc_init(); 936 if (err) 937 goto ndisc_fail; 938 err = igmp6_init(); 939 if (err) 940 goto igmp_fail; 941 942 err = ipv6_netfilter_init(); 943 if (err) 944 goto netfilter_fail; 945 /* Create /proc/foo6 entries. */ 946 #ifdef CONFIG_PROC_FS 947 err = -ENOMEM; 948 if (raw6_proc_init()) 949 goto proc_raw6_fail; 950 if (udplite6_proc_init()) 951 goto proc_udplite6_fail; 952 if (ipv6_misc_proc_init()) 953 goto proc_misc6_fail; 954 if (if6_proc_init()) 955 goto proc_if6_fail; 956 #endif 957 err = ip6_route_init(); 958 if (err) 959 goto ip6_route_fail; 960 err = ndisc_late_init(); 961 if (err) 962 goto ndisc_late_fail; 963 err = ip6_flowlabel_init(); 964 if (err) 965 goto ip6_flowlabel_fail; 966 err = addrconf_init(); 967 if (err) 968 goto addrconf_fail; 969 970 /* Init v6 extension headers. */ 971 err = ipv6_exthdrs_init(); 972 if (err) 973 goto ipv6_exthdrs_fail; 974 975 err = ipv6_frag_init(); 976 if (err) 977 goto ipv6_frag_fail; 978 979 /* Init v6 transport protocols. */ 980 err = udpv6_init(); 981 if (err) 982 goto udpv6_fail; 983 984 err = udplitev6_init(); 985 if (err) 986 goto udplitev6_fail; 987 988 err = udpv6_offload_init(); 989 if (err) 990 goto udpv6_offload_fail; 991 992 err = tcpv6_init(); 993 if (err) 994 goto tcpv6_fail; 995 996 err = ipv6_packet_init(); 997 if (err) 998 goto ipv6_packet_fail; 999 1000 err = pingv6_init(); 1001 if (err) 1002 goto pingv6_fail; 1003 1004 err = calipso_init(); 1005 if (err) 1006 goto calipso_fail; 1007 1008 err = seg6_init(); 1009 if (err) 1010 goto seg6_fail; 1011 1012 err = igmp6_late_init(); 1013 if (err) 1014 goto igmp6_late_err; 1015 1016 #ifdef CONFIG_SYSCTL 1017 err = ipv6_sysctl_register(); 1018 if (err) 1019 goto sysctl_fail; 1020 #endif 1021 1022 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1023 wmb(); 1024 ipv6_stub = &ipv6_stub_impl; 1025 out: 1026 return err; 1027 1028 #ifdef CONFIG_SYSCTL 1029 sysctl_fail: 1030 igmp6_late_cleanup(); 1031 #endif 1032 igmp6_late_err: 1033 seg6_exit(); 1034 seg6_fail: 1035 calipso_exit(); 1036 calipso_fail: 1037 pingv6_exit(); 1038 pingv6_fail: 1039 ipv6_packet_cleanup(); 1040 ipv6_packet_fail: 1041 tcpv6_exit(); 1042 tcpv6_fail: 1043 udpv6_offload_exit(); 1044 udpv6_offload_fail: 1045 udplitev6_exit(); 1046 udplitev6_fail: 1047 udpv6_exit(); 1048 udpv6_fail: 1049 ipv6_frag_exit(); 1050 ipv6_frag_fail: 1051 ipv6_exthdrs_exit(); 1052 ipv6_exthdrs_fail: 1053 addrconf_cleanup(); 1054 addrconf_fail: 1055 ip6_flowlabel_cleanup(); 1056 ip6_flowlabel_fail: 1057 ndisc_late_cleanup(); 1058 ndisc_late_fail: 1059 ip6_route_cleanup(); 1060 ip6_route_fail: 1061 #ifdef CONFIG_PROC_FS 1062 if6_proc_exit(); 1063 proc_if6_fail: 1064 ipv6_misc_proc_exit(); 1065 proc_misc6_fail: 1066 udplite6_proc_exit(); 1067 proc_udplite6_fail: 1068 raw6_proc_exit(); 1069 proc_raw6_fail: 1070 #endif 1071 ipv6_netfilter_fini(); 1072 netfilter_fail: 1073 igmp6_cleanup(); 1074 igmp_fail: 1075 ndisc_cleanup(); 1076 ndisc_fail: 1077 ip6_mr_cleanup(); 1078 icmp_fail: 1079 unregister_pernet_subsys(&inet6_net_ops); 1080 ipmr_fail: 1081 icmpv6_cleanup(); 1082 register_pernet_fail: 1083 sock_unregister(PF_INET6); 1084 rtnl_unregister_all(PF_INET6); 1085 out_sock_register_fail: 1086 rawv6_exit(); 1087 out_unregister_ping_proto: 1088 proto_unregister(&pingv6_prot); 1089 out_unregister_raw_proto: 1090 proto_unregister(&rawv6_prot); 1091 out_unregister_udplite_proto: 1092 proto_unregister(&udplitev6_prot); 1093 out_unregister_udp_proto: 1094 proto_unregister(&udpv6_prot); 1095 out_unregister_tcp_proto: 1096 proto_unregister(&tcpv6_prot); 1097 goto out; 1098 } 1099 module_init(inet6_init); 1100 1101 MODULE_ALIAS_NETPROTO(PF_INET6); 1102