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 bool saved_ipv6only; 288 int addr_type = 0; 289 int err = 0; 290 291 /* If the socket has its own bind function then use it. */ 292 if (sk->sk_prot->bind) 293 return sk->sk_prot->bind(sk, uaddr, addr_len); 294 295 if (addr_len < SIN6_LEN_RFC2133) 296 return -EINVAL; 297 298 if (addr->sin6_family != AF_INET6) 299 return -EAFNOSUPPORT; 300 301 addr_type = ipv6_addr_type(&addr->sin6_addr); 302 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 303 return -EINVAL; 304 305 snum = ntohs(addr->sin6_port); 306 if (snum && snum < inet_prot_sock(net) && 307 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 308 return -EACCES; 309 310 lock_sock(sk); 311 312 /* Check these errors (active socket, double bind). */ 313 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 314 err = -EINVAL; 315 goto out; 316 } 317 318 /* Check if the address belongs to the host. */ 319 if (addr_type == IPV6_ADDR_MAPPED) { 320 int chk_addr_ret; 321 322 /* Binding to v4-mapped address on a v6-only socket 323 * makes no sense 324 */ 325 if (sk->sk_ipv6only) { 326 err = -EINVAL; 327 goto out; 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(net, v4addr); 333 if (!net->ipv4.sysctl_ip_nonlocal_bind && 334 !(inet->freebind || inet->transparent) && 335 v4addr != htonl(INADDR_ANY) && 336 chk_addr_ret != RTN_LOCAL && 337 chk_addr_ret != RTN_MULTICAST && 338 chk_addr_ret != RTN_BROADCAST) { 339 err = -EADDRNOTAVAIL; 340 goto out; 341 } 342 } else { 343 if (addr_type != IPV6_ADDR_ANY) { 344 struct net_device *dev = NULL; 345 346 rcu_read_lock(); 347 if (__ipv6_addr_needs_scope_id(addr_type)) { 348 if (addr_len >= sizeof(struct sockaddr_in6) && 349 addr->sin6_scope_id) { 350 /* Override any existing binding, if another one 351 * is supplied by user. 352 */ 353 sk->sk_bound_dev_if = addr->sin6_scope_id; 354 } 355 356 /* Binding to link-local address requires an interface */ 357 if (!sk->sk_bound_dev_if) { 358 err = -EINVAL; 359 goto out_unlock; 360 } 361 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 362 if (!dev) { 363 err = -ENODEV; 364 goto out_unlock; 365 } 366 } 367 368 /* ipv4 addr of the socket is invalid. Only the 369 * unspecified and mapped address have a v4 equivalent. 370 */ 371 v4addr = LOOPBACK4_IPV6; 372 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 373 if (!net->ipv6.sysctl.ip_nonlocal_bind && 374 !(inet->freebind || inet->transparent) && 375 !ipv6_chk_addr(net, &addr->sin6_addr, 376 dev, 0)) { 377 err = -EADDRNOTAVAIL; 378 goto out_unlock; 379 } 380 } 381 rcu_read_unlock(); 382 } 383 } 384 385 inet->inet_rcv_saddr = v4addr; 386 inet->inet_saddr = v4addr; 387 388 sk->sk_v6_rcv_saddr = addr->sin6_addr; 389 390 if (!(addr_type & IPV6_ADDR_MULTICAST)) 391 np->saddr = addr->sin6_addr; 392 393 saved_ipv6only = sk->sk_ipv6only; 394 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED) 395 sk->sk_ipv6only = 1; 396 397 /* Make sure we are allowed to bind here. */ 398 if ((snum || !inet->bind_address_no_port) && 399 sk->sk_prot->get_port(sk, snum)) { 400 sk->sk_ipv6only = saved_ipv6only; 401 inet_reset_saddr(sk); 402 err = -EADDRINUSE; 403 goto out; 404 } 405 406 if (addr_type != IPV6_ADDR_ANY) 407 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 408 if (snum) 409 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 410 inet->inet_sport = htons(inet->inet_num); 411 inet->inet_dport = 0; 412 inet->inet_daddr = 0; 413 out: 414 release_sock(sk); 415 return err; 416 out_unlock: 417 rcu_read_unlock(); 418 goto out; 419 } 420 EXPORT_SYMBOL(inet6_bind); 421 422 int inet6_release(struct socket *sock) 423 { 424 struct sock *sk = sock->sk; 425 426 if (!sk) 427 return -EINVAL; 428 429 /* Free mc lists */ 430 ipv6_sock_mc_close(sk); 431 432 /* Free ac lists */ 433 ipv6_sock_ac_close(sk); 434 435 return inet_release(sock); 436 } 437 EXPORT_SYMBOL(inet6_release); 438 439 void inet6_destroy_sock(struct sock *sk) 440 { 441 struct ipv6_pinfo *np = inet6_sk(sk); 442 struct sk_buff *skb; 443 struct ipv6_txoptions *opt; 444 445 /* Release rx options */ 446 447 skb = xchg(&np->pktoptions, NULL); 448 if (skb) 449 kfree_skb(skb); 450 451 skb = xchg(&np->rxpmtu, NULL); 452 if (skb) 453 kfree_skb(skb); 454 455 /* Free flowlabels */ 456 fl6_free_socklist(sk); 457 458 /* Free tx options */ 459 460 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 461 if (opt) { 462 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 463 txopt_put(opt); 464 } 465 } 466 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 467 468 /* 469 * This does both peername and sockname. 470 */ 471 472 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 473 int *uaddr_len, int peer) 474 { 475 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 476 struct sock *sk = sock->sk; 477 struct inet_sock *inet = inet_sk(sk); 478 struct ipv6_pinfo *np = inet6_sk(sk); 479 480 sin->sin6_family = AF_INET6; 481 sin->sin6_flowinfo = 0; 482 sin->sin6_scope_id = 0; 483 if (peer) { 484 if (!inet->inet_dport) 485 return -ENOTCONN; 486 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 487 peer == 1) 488 return -ENOTCONN; 489 sin->sin6_port = inet->inet_dport; 490 sin->sin6_addr = sk->sk_v6_daddr; 491 if (np->sndflow) 492 sin->sin6_flowinfo = np->flow_label; 493 } else { 494 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 495 sin->sin6_addr = np->saddr; 496 else 497 sin->sin6_addr = sk->sk_v6_rcv_saddr; 498 499 sin->sin6_port = inet->inet_sport; 500 } 501 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 502 sk->sk_bound_dev_if); 503 *uaddr_len = sizeof(*sin); 504 return 0; 505 } 506 EXPORT_SYMBOL(inet6_getname); 507 508 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 509 { 510 struct sock *sk = sock->sk; 511 struct net *net = sock_net(sk); 512 513 switch (cmd) { 514 case SIOCGSTAMP: 515 return sock_get_timestamp(sk, (struct timeval __user *)arg); 516 517 case SIOCGSTAMPNS: 518 return sock_get_timestampns(sk, (struct timespec __user *)arg); 519 520 case SIOCADDRT: 521 case SIOCDELRT: 522 523 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 524 525 case SIOCSIFADDR: 526 return addrconf_add_ifaddr(net, (void __user *) arg); 527 case SIOCDIFADDR: 528 return addrconf_del_ifaddr(net, (void __user *) arg); 529 case SIOCSIFDSTADDR: 530 return addrconf_set_dstaddr(net, (void __user *) arg); 531 default: 532 if (!sk->sk_prot->ioctl) 533 return -ENOIOCTLCMD; 534 return sk->sk_prot->ioctl(sk, cmd, arg); 535 } 536 /*NOTREACHED*/ 537 return 0; 538 } 539 EXPORT_SYMBOL(inet6_ioctl); 540 541 const struct proto_ops inet6_stream_ops = { 542 .family = PF_INET6, 543 .owner = THIS_MODULE, 544 .release = inet6_release, 545 .bind = inet6_bind, 546 .connect = inet_stream_connect, /* ok */ 547 .socketpair = sock_no_socketpair, /* a do nothing */ 548 .accept = inet_accept, /* ok */ 549 .getname = inet6_getname, 550 .poll = tcp_poll, /* ok */ 551 .ioctl = inet6_ioctl, /* must change */ 552 .listen = inet_listen, /* ok */ 553 .shutdown = inet_shutdown, /* ok */ 554 .setsockopt = sock_common_setsockopt, /* ok */ 555 .getsockopt = sock_common_getsockopt, /* ok */ 556 .sendmsg = inet_sendmsg, /* ok */ 557 .recvmsg = inet_recvmsg, /* ok */ 558 .mmap = sock_no_mmap, 559 .sendpage = inet_sendpage, 560 .sendmsg_locked = tcp_sendmsg_locked, 561 .sendpage_locked = tcp_sendpage_locked, 562 .splice_read = tcp_splice_read, 563 .read_sock = tcp_read_sock, 564 .peek_len = tcp_peek_len, 565 #ifdef CONFIG_COMPAT 566 .compat_setsockopt = compat_sock_common_setsockopt, 567 .compat_getsockopt = compat_sock_common_getsockopt, 568 #endif 569 }; 570 571 const struct proto_ops inet6_dgram_ops = { 572 .family = PF_INET6, 573 .owner = THIS_MODULE, 574 .release = inet6_release, 575 .bind = inet6_bind, 576 .connect = inet_dgram_connect, /* ok */ 577 .socketpair = sock_no_socketpair, /* a do nothing */ 578 .accept = sock_no_accept, /* a do nothing */ 579 .getname = inet6_getname, 580 .poll = udp_poll, /* ok */ 581 .ioctl = inet6_ioctl, /* must change */ 582 .listen = sock_no_listen, /* ok */ 583 .shutdown = inet_shutdown, /* ok */ 584 .setsockopt = sock_common_setsockopt, /* ok */ 585 .getsockopt = sock_common_getsockopt, /* ok */ 586 .sendmsg = inet_sendmsg, /* ok */ 587 .recvmsg = inet_recvmsg, /* ok */ 588 .mmap = sock_no_mmap, 589 .sendpage = sock_no_sendpage, 590 .set_peek_off = sk_set_peek_off, 591 #ifdef CONFIG_COMPAT 592 .compat_setsockopt = compat_sock_common_setsockopt, 593 .compat_getsockopt = compat_sock_common_getsockopt, 594 #endif 595 }; 596 597 static const struct net_proto_family inet6_family_ops = { 598 .family = PF_INET6, 599 .create = inet6_create, 600 .owner = THIS_MODULE, 601 }; 602 603 int inet6_register_protosw(struct inet_protosw *p) 604 { 605 struct list_head *lh; 606 struct inet_protosw *answer; 607 struct list_head *last_perm; 608 int protocol = p->protocol; 609 int ret; 610 611 spin_lock_bh(&inetsw6_lock); 612 613 ret = -EINVAL; 614 if (p->type >= SOCK_MAX) 615 goto out_illegal; 616 617 /* If we are trying to override a permanent protocol, bail. */ 618 answer = NULL; 619 ret = -EPERM; 620 last_perm = &inetsw6[p->type]; 621 list_for_each(lh, &inetsw6[p->type]) { 622 answer = list_entry(lh, struct inet_protosw, list); 623 624 /* Check only the non-wild match. */ 625 if (INET_PROTOSW_PERMANENT & answer->flags) { 626 if (protocol == answer->protocol) 627 break; 628 last_perm = lh; 629 } 630 631 answer = NULL; 632 } 633 if (answer) 634 goto out_permanent; 635 636 /* Add the new entry after the last permanent entry if any, so that 637 * the new entry does not override a permanent entry when matched with 638 * a wild-card protocol. But it is allowed to override any existing 639 * non-permanent entry. This means that when we remove this entry, the 640 * system automatically returns to the old behavior. 641 */ 642 list_add_rcu(&p->list, last_perm); 643 ret = 0; 644 out: 645 spin_unlock_bh(&inetsw6_lock); 646 return ret; 647 648 out_permanent: 649 pr_err("Attempt to override permanent protocol %d\n", protocol); 650 goto out; 651 652 out_illegal: 653 pr_err("Ignoring attempt to register invalid socket type %d\n", 654 p->type); 655 goto out; 656 } 657 EXPORT_SYMBOL(inet6_register_protosw); 658 659 void 660 inet6_unregister_protosw(struct inet_protosw *p) 661 { 662 if (INET_PROTOSW_PERMANENT & p->flags) { 663 pr_err("Attempt to unregister permanent protocol %d\n", 664 p->protocol); 665 } else { 666 spin_lock_bh(&inetsw6_lock); 667 list_del_rcu(&p->list); 668 spin_unlock_bh(&inetsw6_lock); 669 670 synchronize_net(); 671 } 672 } 673 EXPORT_SYMBOL(inet6_unregister_protosw); 674 675 int inet6_sk_rebuild_header(struct sock *sk) 676 { 677 struct ipv6_pinfo *np = inet6_sk(sk); 678 struct dst_entry *dst; 679 680 dst = __sk_dst_check(sk, np->dst_cookie); 681 682 if (!dst) { 683 struct inet_sock *inet = inet_sk(sk); 684 struct in6_addr *final_p, final; 685 struct flowi6 fl6; 686 687 memset(&fl6, 0, sizeof(fl6)); 688 fl6.flowi6_proto = sk->sk_protocol; 689 fl6.daddr = sk->sk_v6_daddr; 690 fl6.saddr = np->saddr; 691 fl6.flowlabel = np->flow_label; 692 fl6.flowi6_oif = sk->sk_bound_dev_if; 693 fl6.flowi6_mark = sk->sk_mark; 694 fl6.fl6_dport = inet->inet_dport; 695 fl6.fl6_sport = inet->inet_sport; 696 fl6.flowi6_uid = sk->sk_uid; 697 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 698 699 rcu_read_lock(); 700 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 701 &final); 702 rcu_read_unlock(); 703 704 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 705 if (IS_ERR(dst)) { 706 sk->sk_route_caps = 0; 707 sk->sk_err_soft = -PTR_ERR(dst); 708 return PTR_ERR(dst); 709 } 710 711 ip6_dst_store(sk, dst, NULL, NULL); 712 } 713 714 return 0; 715 } 716 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 717 718 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 719 const struct inet6_skb_parm *opt) 720 { 721 const struct ipv6_pinfo *np = inet6_sk(sk); 722 723 if (np->rxopt.all) { 724 if (((opt->flags & IP6SKB_HOPBYHOP) && 725 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 726 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 727 np->rxopt.bits.rxflow) || 728 (opt->srcrt && (np->rxopt.bits.srcrt || 729 np->rxopt.bits.osrcrt)) || 730 ((opt->dst1 || opt->dst0) && 731 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 732 return true; 733 } 734 return false; 735 } 736 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 737 738 static struct packet_type ipv6_packet_type __read_mostly = { 739 .type = cpu_to_be16(ETH_P_IPV6), 740 .func = ipv6_rcv, 741 }; 742 743 static int __init ipv6_packet_init(void) 744 { 745 dev_add_pack(&ipv6_packet_type); 746 return 0; 747 } 748 749 static void ipv6_packet_cleanup(void) 750 { 751 dev_remove_pack(&ipv6_packet_type); 752 } 753 754 static int __net_init ipv6_init_mibs(struct net *net) 755 { 756 int i; 757 758 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 759 if (!net->mib.udp_stats_in6) 760 return -ENOMEM; 761 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 762 if (!net->mib.udplite_stats_in6) 763 goto err_udplite_mib; 764 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 765 if (!net->mib.ipv6_statistics) 766 goto err_ip_mib; 767 768 for_each_possible_cpu(i) { 769 struct ipstats_mib *af_inet6_stats; 770 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 771 u64_stats_init(&af_inet6_stats->syncp); 772 } 773 774 775 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 776 if (!net->mib.icmpv6_statistics) 777 goto err_icmp_mib; 778 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 779 GFP_KERNEL); 780 if (!net->mib.icmpv6msg_statistics) 781 goto err_icmpmsg_mib; 782 return 0; 783 784 err_icmpmsg_mib: 785 free_percpu(net->mib.icmpv6_statistics); 786 err_icmp_mib: 787 free_percpu(net->mib.ipv6_statistics); 788 err_ip_mib: 789 free_percpu(net->mib.udplite_stats_in6); 790 err_udplite_mib: 791 free_percpu(net->mib.udp_stats_in6); 792 return -ENOMEM; 793 } 794 795 static void ipv6_cleanup_mibs(struct net *net) 796 { 797 free_percpu(net->mib.udp_stats_in6); 798 free_percpu(net->mib.udplite_stats_in6); 799 free_percpu(net->mib.ipv6_statistics); 800 free_percpu(net->mib.icmpv6_statistics); 801 kfree(net->mib.icmpv6msg_statistics); 802 } 803 804 static int __net_init inet6_net_init(struct net *net) 805 { 806 int err = 0; 807 808 net->ipv6.sysctl.bindv6only = 0; 809 net->ipv6.sysctl.icmpv6_time = 1*HZ; 810 net->ipv6.sysctl.flowlabel_consistency = 1; 811 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 812 net->ipv6.sysctl.idgen_retries = 3; 813 net->ipv6.sysctl.idgen_delay = 1 * HZ; 814 net->ipv6.sysctl.flowlabel_state_ranges = 0; 815 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 816 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 817 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 818 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 819 atomic_set(&net->ipv6.fib6_sernum, 1); 820 821 err = ipv6_init_mibs(net); 822 if (err) 823 return err; 824 #ifdef CONFIG_PROC_FS 825 err = udp6_proc_init(net); 826 if (err) 827 goto out; 828 err = tcp6_proc_init(net); 829 if (err) 830 goto proc_tcp6_fail; 831 err = ac6_proc_init(net); 832 if (err) 833 goto proc_ac6_fail; 834 #endif 835 return err; 836 837 #ifdef CONFIG_PROC_FS 838 proc_ac6_fail: 839 tcp6_proc_exit(net); 840 proc_tcp6_fail: 841 udp6_proc_exit(net); 842 out: 843 ipv6_cleanup_mibs(net); 844 return err; 845 #endif 846 } 847 848 static void __net_exit inet6_net_exit(struct net *net) 849 { 850 #ifdef CONFIG_PROC_FS 851 udp6_proc_exit(net); 852 tcp6_proc_exit(net); 853 ac6_proc_exit(net); 854 #endif 855 ipv6_cleanup_mibs(net); 856 } 857 858 static struct pernet_operations inet6_net_ops = { 859 .init = inet6_net_init, 860 .exit = inet6_net_exit, 861 }; 862 863 static const struct ipv6_stub ipv6_stub_impl = { 864 .ipv6_sock_mc_join = ipv6_sock_mc_join, 865 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 866 .ipv6_dst_lookup = ip6_dst_lookup, 867 .udpv6_encap_enable = udpv6_encap_enable, 868 .ndisc_send_na = ndisc_send_na, 869 .nd_tbl = &nd_tbl, 870 }; 871 872 static int __init inet6_init(void) 873 { 874 struct list_head *r; 875 int err = 0; 876 877 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 878 879 /* Register the socket-side information for inet6_create. */ 880 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 881 INIT_LIST_HEAD(r); 882 883 if (disable_ipv6_mod) { 884 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 885 goto out; 886 } 887 888 err = proto_register(&tcpv6_prot, 1); 889 if (err) 890 goto out; 891 892 err = proto_register(&udpv6_prot, 1); 893 if (err) 894 goto out_unregister_tcp_proto; 895 896 err = proto_register(&udplitev6_prot, 1); 897 if (err) 898 goto out_unregister_udp_proto; 899 900 err = proto_register(&rawv6_prot, 1); 901 if (err) 902 goto out_unregister_udplite_proto; 903 904 err = proto_register(&pingv6_prot, 1); 905 if (err) 906 goto out_unregister_ping_proto; 907 908 /* We MUST register RAW sockets before we create the ICMP6, 909 * IGMP6, or NDISC control sockets. 910 */ 911 err = rawv6_init(); 912 if (err) 913 goto out_unregister_raw_proto; 914 915 /* Register the family here so that the init calls below will 916 * be able to create sockets. (?? is this dangerous ??) 917 */ 918 err = sock_register(&inet6_family_ops); 919 if (err) 920 goto out_sock_register_fail; 921 922 /* 923 * ipngwg API draft makes clear that the correct semantics 924 * for TCP and UDP is to consider one TCP and UDP instance 925 * in a host available by both INET and INET6 APIs and 926 * able to communicate via both network protocols. 927 */ 928 929 err = register_pernet_subsys(&inet6_net_ops); 930 if (err) 931 goto register_pernet_fail; 932 err = ip6_mr_init(); 933 if (err) 934 goto ipmr_fail; 935 err = icmpv6_init(); 936 if (err) 937 goto icmp_fail; 938 err = ndisc_init(); 939 if (err) 940 goto ndisc_fail; 941 err = igmp6_init(); 942 if (err) 943 goto igmp_fail; 944 945 err = ipv6_netfilter_init(); 946 if (err) 947 goto netfilter_fail; 948 /* Create /proc/foo6 entries. */ 949 #ifdef CONFIG_PROC_FS 950 err = -ENOMEM; 951 if (raw6_proc_init()) 952 goto proc_raw6_fail; 953 if (udplite6_proc_init()) 954 goto proc_udplite6_fail; 955 if (ipv6_misc_proc_init()) 956 goto proc_misc6_fail; 957 if (if6_proc_init()) 958 goto proc_if6_fail; 959 #endif 960 err = ip6_route_init(); 961 if (err) 962 goto ip6_route_fail; 963 err = ndisc_late_init(); 964 if (err) 965 goto ndisc_late_fail; 966 err = ip6_flowlabel_init(); 967 if (err) 968 goto ip6_flowlabel_fail; 969 err = addrconf_init(); 970 if (err) 971 goto addrconf_fail; 972 973 /* Init v6 extension headers. */ 974 err = ipv6_exthdrs_init(); 975 if (err) 976 goto ipv6_exthdrs_fail; 977 978 err = ipv6_frag_init(); 979 if (err) 980 goto ipv6_frag_fail; 981 982 /* Init v6 transport protocols. */ 983 err = udpv6_init(); 984 if (err) 985 goto udpv6_fail; 986 987 err = udplitev6_init(); 988 if (err) 989 goto udplitev6_fail; 990 991 err = udpv6_offload_init(); 992 if (err) 993 goto udpv6_offload_fail; 994 995 err = tcpv6_init(); 996 if (err) 997 goto tcpv6_fail; 998 999 err = ipv6_packet_init(); 1000 if (err) 1001 goto ipv6_packet_fail; 1002 1003 err = pingv6_init(); 1004 if (err) 1005 goto pingv6_fail; 1006 1007 err = calipso_init(); 1008 if (err) 1009 goto calipso_fail; 1010 1011 err = seg6_init(); 1012 if (err) 1013 goto seg6_fail; 1014 1015 err = igmp6_late_init(); 1016 if (err) 1017 goto igmp6_late_err; 1018 1019 #ifdef CONFIG_SYSCTL 1020 err = ipv6_sysctl_register(); 1021 if (err) 1022 goto sysctl_fail; 1023 #endif 1024 1025 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1026 wmb(); 1027 ipv6_stub = &ipv6_stub_impl; 1028 out: 1029 return err; 1030 1031 #ifdef CONFIG_SYSCTL 1032 sysctl_fail: 1033 igmp6_late_cleanup(); 1034 #endif 1035 igmp6_late_err: 1036 seg6_exit(); 1037 seg6_fail: 1038 calipso_exit(); 1039 calipso_fail: 1040 pingv6_exit(); 1041 pingv6_fail: 1042 ipv6_packet_cleanup(); 1043 ipv6_packet_fail: 1044 tcpv6_exit(); 1045 tcpv6_fail: 1046 udpv6_offload_exit(); 1047 udpv6_offload_fail: 1048 udplitev6_exit(); 1049 udplitev6_fail: 1050 udpv6_exit(); 1051 udpv6_fail: 1052 ipv6_frag_exit(); 1053 ipv6_frag_fail: 1054 ipv6_exthdrs_exit(); 1055 ipv6_exthdrs_fail: 1056 addrconf_cleanup(); 1057 addrconf_fail: 1058 ip6_flowlabel_cleanup(); 1059 ip6_flowlabel_fail: 1060 ndisc_late_cleanup(); 1061 ndisc_late_fail: 1062 ip6_route_cleanup(); 1063 ip6_route_fail: 1064 #ifdef CONFIG_PROC_FS 1065 if6_proc_exit(); 1066 proc_if6_fail: 1067 ipv6_misc_proc_exit(); 1068 proc_misc6_fail: 1069 udplite6_proc_exit(); 1070 proc_udplite6_fail: 1071 raw6_proc_exit(); 1072 proc_raw6_fail: 1073 #endif 1074 ipv6_netfilter_fini(); 1075 netfilter_fail: 1076 igmp6_cleanup(); 1077 igmp_fail: 1078 ndisc_cleanup(); 1079 ndisc_fail: 1080 ip6_mr_cleanup(); 1081 icmp_fail: 1082 unregister_pernet_subsys(&inet6_net_ops); 1083 ipmr_fail: 1084 icmpv6_cleanup(); 1085 register_pernet_fail: 1086 sock_unregister(PF_INET6); 1087 rtnl_unregister_all(PF_INET6); 1088 out_sock_register_fail: 1089 rawv6_exit(); 1090 out_unregister_ping_proto: 1091 proto_unregister(&pingv6_prot); 1092 out_unregister_raw_proto: 1093 proto_unregister(&rawv6_prot); 1094 out_unregister_udplite_proto: 1095 proto_unregister(&udplitev6_prot); 1096 out_unregister_udp_proto: 1097 proto_unregister(&udpv6_prot); 1098 out_unregister_tcp_proto: 1099 proto_unregister(&tcpv6_prot); 1100 goto out; 1101 } 1102 module_init(inet6_init); 1103 1104 MODULE_ALIAS_NETPROTO(PF_INET6); 1105