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 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 return sizeof(*sin); 504 } 505 EXPORT_SYMBOL(inet6_getname); 506 507 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 508 { 509 struct sock *sk = sock->sk; 510 struct net *net = sock_net(sk); 511 512 switch (cmd) { 513 case SIOCGSTAMP: 514 return sock_get_timestamp(sk, (struct timeval __user *)arg); 515 516 case SIOCGSTAMPNS: 517 return sock_get_timestampns(sk, (struct timespec __user *)arg); 518 519 case SIOCADDRT: 520 case SIOCDELRT: 521 522 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 523 524 case SIOCSIFADDR: 525 return addrconf_add_ifaddr(net, (void __user *) arg); 526 case SIOCDIFADDR: 527 return addrconf_del_ifaddr(net, (void __user *) arg); 528 case SIOCSIFDSTADDR: 529 return addrconf_set_dstaddr(net, (void __user *) arg); 530 default: 531 if (!sk->sk_prot->ioctl) 532 return -ENOIOCTLCMD; 533 return sk->sk_prot->ioctl(sk, cmd, arg); 534 } 535 /*NOTREACHED*/ 536 return 0; 537 } 538 EXPORT_SYMBOL(inet6_ioctl); 539 540 const struct proto_ops inet6_stream_ops = { 541 .family = PF_INET6, 542 .owner = THIS_MODULE, 543 .release = inet6_release, 544 .bind = inet6_bind, 545 .connect = inet_stream_connect, /* ok */ 546 .socketpair = sock_no_socketpair, /* a do nothing */ 547 .accept = inet_accept, /* ok */ 548 .getname = inet6_getname, 549 .poll = tcp_poll, /* ok */ 550 .ioctl = inet6_ioctl, /* must change */ 551 .listen = inet_listen, /* ok */ 552 .shutdown = inet_shutdown, /* ok */ 553 .setsockopt = sock_common_setsockopt, /* ok */ 554 .getsockopt = sock_common_getsockopt, /* ok */ 555 .sendmsg = inet_sendmsg, /* ok */ 556 .recvmsg = inet_recvmsg, /* ok */ 557 .mmap = sock_no_mmap, 558 .sendpage = inet_sendpage, 559 .sendmsg_locked = tcp_sendmsg_locked, 560 .sendpage_locked = tcp_sendpage_locked, 561 .splice_read = tcp_splice_read, 562 .read_sock = tcp_read_sock, 563 .peek_len = tcp_peek_len, 564 #ifdef CONFIG_COMPAT 565 .compat_setsockopt = compat_sock_common_setsockopt, 566 .compat_getsockopt = compat_sock_common_getsockopt, 567 #endif 568 }; 569 570 const struct proto_ops inet6_dgram_ops = { 571 .family = PF_INET6, 572 .owner = THIS_MODULE, 573 .release = inet6_release, 574 .bind = inet6_bind, 575 .connect = inet_dgram_connect, /* ok */ 576 .socketpair = sock_no_socketpair, /* a do nothing */ 577 .accept = sock_no_accept, /* a do nothing */ 578 .getname = inet6_getname, 579 .poll = udp_poll, /* ok */ 580 .ioctl = inet6_ioctl, /* must change */ 581 .listen = sock_no_listen, /* ok */ 582 .shutdown = inet_shutdown, /* ok */ 583 .setsockopt = sock_common_setsockopt, /* ok */ 584 .getsockopt = sock_common_getsockopt, /* ok */ 585 .sendmsg = inet_sendmsg, /* ok */ 586 .recvmsg = inet_recvmsg, /* ok */ 587 .mmap = sock_no_mmap, 588 .sendpage = sock_no_sendpage, 589 .set_peek_off = sk_set_peek_off, 590 #ifdef CONFIG_COMPAT 591 .compat_setsockopt = compat_sock_common_setsockopt, 592 .compat_getsockopt = compat_sock_common_getsockopt, 593 #endif 594 }; 595 596 static const struct net_proto_family inet6_family_ops = { 597 .family = PF_INET6, 598 .create = inet6_create, 599 .owner = THIS_MODULE, 600 }; 601 602 int inet6_register_protosw(struct inet_protosw *p) 603 { 604 struct list_head *lh; 605 struct inet_protosw *answer; 606 struct list_head *last_perm; 607 int protocol = p->protocol; 608 int ret; 609 610 spin_lock_bh(&inetsw6_lock); 611 612 ret = -EINVAL; 613 if (p->type >= SOCK_MAX) 614 goto out_illegal; 615 616 /* If we are trying to override a permanent protocol, bail. */ 617 answer = NULL; 618 ret = -EPERM; 619 last_perm = &inetsw6[p->type]; 620 list_for_each(lh, &inetsw6[p->type]) { 621 answer = list_entry(lh, struct inet_protosw, list); 622 623 /* Check only the non-wild match. */ 624 if (INET_PROTOSW_PERMANENT & answer->flags) { 625 if (protocol == answer->protocol) 626 break; 627 last_perm = lh; 628 } 629 630 answer = NULL; 631 } 632 if (answer) 633 goto out_permanent; 634 635 /* Add the new entry after the last permanent entry if any, so that 636 * the new entry does not override a permanent entry when matched with 637 * a wild-card protocol. But it is allowed to override any existing 638 * non-permanent entry. This means that when we remove this entry, the 639 * system automatically returns to the old behavior. 640 */ 641 list_add_rcu(&p->list, last_perm); 642 ret = 0; 643 out: 644 spin_unlock_bh(&inetsw6_lock); 645 return ret; 646 647 out_permanent: 648 pr_err("Attempt to override permanent protocol %d\n", protocol); 649 goto out; 650 651 out_illegal: 652 pr_err("Ignoring attempt to register invalid socket type %d\n", 653 p->type); 654 goto out; 655 } 656 EXPORT_SYMBOL(inet6_register_protosw); 657 658 void 659 inet6_unregister_protosw(struct inet_protosw *p) 660 { 661 if (INET_PROTOSW_PERMANENT & p->flags) { 662 pr_err("Attempt to unregister permanent protocol %d\n", 663 p->protocol); 664 } else { 665 spin_lock_bh(&inetsw6_lock); 666 list_del_rcu(&p->list); 667 spin_unlock_bh(&inetsw6_lock); 668 669 synchronize_net(); 670 } 671 } 672 EXPORT_SYMBOL(inet6_unregister_protosw); 673 674 int inet6_sk_rebuild_header(struct sock *sk) 675 { 676 struct ipv6_pinfo *np = inet6_sk(sk); 677 struct dst_entry *dst; 678 679 dst = __sk_dst_check(sk, np->dst_cookie); 680 681 if (!dst) { 682 struct inet_sock *inet = inet_sk(sk); 683 struct in6_addr *final_p, final; 684 struct flowi6 fl6; 685 686 memset(&fl6, 0, sizeof(fl6)); 687 fl6.flowi6_proto = sk->sk_protocol; 688 fl6.daddr = sk->sk_v6_daddr; 689 fl6.saddr = np->saddr; 690 fl6.flowlabel = np->flow_label; 691 fl6.flowi6_oif = sk->sk_bound_dev_if; 692 fl6.flowi6_mark = sk->sk_mark; 693 fl6.fl6_dport = inet->inet_dport; 694 fl6.fl6_sport = inet->inet_sport; 695 fl6.flowi6_uid = sk->sk_uid; 696 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 697 698 rcu_read_lock(); 699 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 700 &final); 701 rcu_read_unlock(); 702 703 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 704 if (IS_ERR(dst)) { 705 sk->sk_route_caps = 0; 706 sk->sk_err_soft = -PTR_ERR(dst); 707 return PTR_ERR(dst); 708 } 709 710 ip6_dst_store(sk, dst, NULL, NULL); 711 } 712 713 return 0; 714 } 715 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 716 717 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 718 const struct inet6_skb_parm *opt) 719 { 720 const struct ipv6_pinfo *np = inet6_sk(sk); 721 722 if (np->rxopt.all) { 723 if (((opt->flags & IP6SKB_HOPBYHOP) && 724 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 725 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 726 np->rxopt.bits.rxflow) || 727 (opt->srcrt && (np->rxopt.bits.srcrt || 728 np->rxopt.bits.osrcrt)) || 729 ((opt->dst1 || opt->dst0) && 730 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 731 return true; 732 } 733 return false; 734 } 735 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 736 737 static struct packet_type ipv6_packet_type __read_mostly = { 738 .type = cpu_to_be16(ETH_P_IPV6), 739 .func = ipv6_rcv, 740 }; 741 742 static int __init ipv6_packet_init(void) 743 { 744 dev_add_pack(&ipv6_packet_type); 745 return 0; 746 } 747 748 static void ipv6_packet_cleanup(void) 749 { 750 dev_remove_pack(&ipv6_packet_type); 751 } 752 753 static int __net_init ipv6_init_mibs(struct net *net) 754 { 755 int i; 756 757 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 758 if (!net->mib.udp_stats_in6) 759 return -ENOMEM; 760 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 761 if (!net->mib.udplite_stats_in6) 762 goto err_udplite_mib; 763 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 764 if (!net->mib.ipv6_statistics) 765 goto err_ip_mib; 766 767 for_each_possible_cpu(i) { 768 struct ipstats_mib *af_inet6_stats; 769 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 770 u64_stats_init(&af_inet6_stats->syncp); 771 } 772 773 774 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 775 if (!net->mib.icmpv6_statistics) 776 goto err_icmp_mib; 777 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 778 GFP_KERNEL); 779 if (!net->mib.icmpv6msg_statistics) 780 goto err_icmpmsg_mib; 781 return 0; 782 783 err_icmpmsg_mib: 784 free_percpu(net->mib.icmpv6_statistics); 785 err_icmp_mib: 786 free_percpu(net->mib.ipv6_statistics); 787 err_ip_mib: 788 free_percpu(net->mib.udplite_stats_in6); 789 err_udplite_mib: 790 free_percpu(net->mib.udp_stats_in6); 791 return -ENOMEM; 792 } 793 794 static void ipv6_cleanup_mibs(struct net *net) 795 { 796 free_percpu(net->mib.udp_stats_in6); 797 free_percpu(net->mib.udplite_stats_in6); 798 free_percpu(net->mib.ipv6_statistics); 799 free_percpu(net->mib.icmpv6_statistics); 800 kfree(net->mib.icmpv6msg_statistics); 801 } 802 803 static int __net_init inet6_net_init(struct net *net) 804 { 805 int err = 0; 806 807 net->ipv6.sysctl.bindv6only = 0; 808 net->ipv6.sysctl.icmpv6_time = 1*HZ; 809 net->ipv6.sysctl.flowlabel_consistency = 1; 810 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 811 net->ipv6.sysctl.idgen_retries = 3; 812 net->ipv6.sysctl.idgen_delay = 1 * HZ; 813 net->ipv6.sysctl.flowlabel_state_ranges = 0; 814 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT; 815 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT; 816 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN; 817 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN; 818 atomic_set(&net->ipv6.fib6_sernum, 1); 819 820 err = ipv6_init_mibs(net); 821 if (err) 822 return err; 823 #ifdef CONFIG_PROC_FS 824 err = udp6_proc_init(net); 825 if (err) 826 goto out; 827 err = tcp6_proc_init(net); 828 if (err) 829 goto proc_tcp6_fail; 830 err = ac6_proc_init(net); 831 if (err) 832 goto proc_ac6_fail; 833 #endif 834 return err; 835 836 #ifdef CONFIG_PROC_FS 837 proc_ac6_fail: 838 tcp6_proc_exit(net); 839 proc_tcp6_fail: 840 udp6_proc_exit(net); 841 out: 842 ipv6_cleanup_mibs(net); 843 return err; 844 #endif 845 } 846 847 static void __net_exit inet6_net_exit(struct net *net) 848 { 849 #ifdef CONFIG_PROC_FS 850 udp6_proc_exit(net); 851 tcp6_proc_exit(net); 852 ac6_proc_exit(net); 853 #endif 854 ipv6_cleanup_mibs(net); 855 } 856 857 static struct pernet_operations inet6_net_ops = { 858 .init = inet6_net_init, 859 .exit = inet6_net_exit, 860 }; 861 862 static const struct ipv6_stub ipv6_stub_impl = { 863 .ipv6_sock_mc_join = ipv6_sock_mc_join, 864 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 865 .ipv6_dst_lookup = ip6_dst_lookup, 866 .udpv6_encap_enable = udpv6_encap_enable, 867 .ndisc_send_na = ndisc_send_na, 868 .nd_tbl = &nd_tbl, 869 }; 870 871 static int __init inet6_init(void) 872 { 873 struct list_head *r; 874 int err = 0; 875 876 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 877 878 /* Register the socket-side information for inet6_create. */ 879 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 880 INIT_LIST_HEAD(r); 881 882 if (disable_ipv6_mod) { 883 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 884 goto out; 885 } 886 887 err = proto_register(&tcpv6_prot, 1); 888 if (err) 889 goto out; 890 891 err = proto_register(&udpv6_prot, 1); 892 if (err) 893 goto out_unregister_tcp_proto; 894 895 err = proto_register(&udplitev6_prot, 1); 896 if (err) 897 goto out_unregister_udp_proto; 898 899 err = proto_register(&rawv6_prot, 1); 900 if (err) 901 goto out_unregister_udplite_proto; 902 903 err = proto_register(&pingv6_prot, 1); 904 if (err) 905 goto out_unregister_ping_proto; 906 907 /* We MUST register RAW sockets before we create the ICMP6, 908 * IGMP6, or NDISC control sockets. 909 */ 910 err = rawv6_init(); 911 if (err) 912 goto out_unregister_raw_proto; 913 914 /* Register the family here so that the init calls below will 915 * be able to create sockets. (?? is this dangerous ??) 916 */ 917 err = sock_register(&inet6_family_ops); 918 if (err) 919 goto out_sock_register_fail; 920 921 /* 922 * ipngwg API draft makes clear that the correct semantics 923 * for TCP and UDP is to consider one TCP and UDP instance 924 * in a host available by both INET and INET6 APIs and 925 * able to communicate via both network protocols. 926 */ 927 928 err = register_pernet_subsys(&inet6_net_ops); 929 if (err) 930 goto register_pernet_fail; 931 err = ip6_mr_init(); 932 if (err) 933 goto ipmr_fail; 934 err = icmpv6_init(); 935 if (err) 936 goto icmp_fail; 937 err = ndisc_init(); 938 if (err) 939 goto ndisc_fail; 940 err = igmp6_init(); 941 if (err) 942 goto igmp_fail; 943 944 err = ipv6_netfilter_init(); 945 if (err) 946 goto netfilter_fail; 947 /* Create /proc/foo6 entries. */ 948 #ifdef CONFIG_PROC_FS 949 err = -ENOMEM; 950 if (raw6_proc_init()) 951 goto proc_raw6_fail; 952 if (udplite6_proc_init()) 953 goto proc_udplite6_fail; 954 if (ipv6_misc_proc_init()) 955 goto proc_misc6_fail; 956 if (if6_proc_init()) 957 goto proc_if6_fail; 958 #endif 959 err = ip6_route_init(); 960 if (err) 961 goto ip6_route_fail; 962 err = ndisc_late_init(); 963 if (err) 964 goto ndisc_late_fail; 965 err = ip6_flowlabel_init(); 966 if (err) 967 goto ip6_flowlabel_fail; 968 err = addrconf_init(); 969 if (err) 970 goto addrconf_fail; 971 972 /* Init v6 extension headers. */ 973 err = ipv6_exthdrs_init(); 974 if (err) 975 goto ipv6_exthdrs_fail; 976 977 err = ipv6_frag_init(); 978 if (err) 979 goto ipv6_frag_fail; 980 981 /* Init v6 transport protocols. */ 982 err = udpv6_init(); 983 if (err) 984 goto udpv6_fail; 985 986 err = udplitev6_init(); 987 if (err) 988 goto udplitev6_fail; 989 990 err = udpv6_offload_init(); 991 if (err) 992 goto udpv6_offload_fail; 993 994 err = tcpv6_init(); 995 if (err) 996 goto tcpv6_fail; 997 998 err = ipv6_packet_init(); 999 if (err) 1000 goto ipv6_packet_fail; 1001 1002 err = pingv6_init(); 1003 if (err) 1004 goto pingv6_fail; 1005 1006 err = calipso_init(); 1007 if (err) 1008 goto calipso_fail; 1009 1010 err = seg6_init(); 1011 if (err) 1012 goto seg6_fail; 1013 1014 err = igmp6_late_init(); 1015 if (err) 1016 goto igmp6_late_err; 1017 1018 #ifdef CONFIG_SYSCTL 1019 err = ipv6_sysctl_register(); 1020 if (err) 1021 goto sysctl_fail; 1022 #endif 1023 1024 /* ensure that ipv6 stubs are visible only after ipv6 is ready */ 1025 wmb(); 1026 ipv6_stub = &ipv6_stub_impl; 1027 out: 1028 return err; 1029 1030 #ifdef CONFIG_SYSCTL 1031 sysctl_fail: 1032 igmp6_late_cleanup(); 1033 #endif 1034 igmp6_late_err: 1035 seg6_exit(); 1036 seg6_fail: 1037 calipso_exit(); 1038 calipso_fail: 1039 pingv6_exit(); 1040 pingv6_fail: 1041 ipv6_packet_cleanup(); 1042 ipv6_packet_fail: 1043 tcpv6_exit(); 1044 tcpv6_fail: 1045 udpv6_offload_exit(); 1046 udpv6_offload_fail: 1047 udplitev6_exit(); 1048 udplitev6_fail: 1049 udpv6_exit(); 1050 udpv6_fail: 1051 ipv6_frag_exit(); 1052 ipv6_frag_fail: 1053 ipv6_exthdrs_exit(); 1054 ipv6_exthdrs_fail: 1055 addrconf_cleanup(); 1056 addrconf_fail: 1057 ip6_flowlabel_cleanup(); 1058 ip6_flowlabel_fail: 1059 ndisc_late_cleanup(); 1060 ndisc_late_fail: 1061 ip6_route_cleanup(); 1062 ip6_route_fail: 1063 #ifdef CONFIG_PROC_FS 1064 if6_proc_exit(); 1065 proc_if6_fail: 1066 ipv6_misc_proc_exit(); 1067 proc_misc6_fail: 1068 udplite6_proc_exit(); 1069 proc_udplite6_fail: 1070 raw6_proc_exit(); 1071 proc_raw6_fail: 1072 #endif 1073 ipv6_netfilter_fini(); 1074 netfilter_fail: 1075 igmp6_cleanup(); 1076 igmp_fail: 1077 ndisc_cleanup(); 1078 ndisc_fail: 1079 ip6_mr_cleanup(); 1080 icmp_fail: 1081 unregister_pernet_subsys(&inet6_net_ops); 1082 ipmr_fail: 1083 icmpv6_cleanup(); 1084 register_pernet_fail: 1085 sock_unregister(PF_INET6); 1086 rtnl_unregister_all(PF_INET6); 1087 out_sock_register_fail: 1088 rawv6_exit(); 1089 out_unregister_ping_proto: 1090 proto_unregister(&pingv6_prot); 1091 out_unregister_raw_proto: 1092 proto_unregister(&rawv6_prot); 1093 out_unregister_udplite_proto: 1094 proto_unregister(&udplitev6_prot); 1095 out_unregister_udp_proto: 1096 proto_unregister(&udpv6_prot); 1097 out_unregister_tcp_proto: 1098 proto_unregister(&tcpv6_prot); 1099 goto out; 1100 } 1101 module_init(inet6_init); 1102 1103 MODULE_ALIAS_NETPROTO(PF_INET6); 1104