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 64 #include <asm/uaccess.h> 65 #include <linux/mroute6.h> 66 67 MODULE_AUTHOR("Cast of dozens"); 68 MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 69 MODULE_LICENSE("GPL"); 70 71 /* The inetsw6 table contains everything that inet6_create needs to 72 * build a new socket. 73 */ 74 static struct list_head inetsw6[SOCK_MAX]; 75 static DEFINE_SPINLOCK(inetsw6_lock); 76 77 struct ipv6_params ipv6_defaults = { 78 .disable_ipv6 = 0, 79 .autoconf = 1, 80 }; 81 82 static int disable_ipv6_mod; 83 84 module_param_named(disable, disable_ipv6_mod, int, 0444); 85 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); 86 87 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); 88 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); 89 90 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); 91 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); 92 93 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 94 { 95 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 96 97 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 98 } 99 100 static int inet6_create(struct net *net, struct socket *sock, int protocol, 101 int kern) 102 { 103 struct inet_sock *inet; 104 struct ipv6_pinfo *np; 105 struct sock *sk; 106 struct inet_protosw *answer; 107 struct proto *answer_prot; 108 unsigned char answer_flags; 109 int try_loading_module = 0; 110 int err; 111 112 if (protocol < 0 || protocol >= IPPROTO_MAX) 113 return -EINVAL; 114 115 /* Look for the requested type/protocol pair. */ 116 lookup_protocol: 117 err = -ESOCKTNOSUPPORT; 118 rcu_read_lock(); 119 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) { 120 121 err = 0; 122 /* Check the non-wild match. */ 123 if (protocol == answer->protocol) { 124 if (protocol != IPPROTO_IP) 125 break; 126 } else { 127 /* Check for the two wild cases. */ 128 if (IPPROTO_IP == protocol) { 129 protocol = answer->protocol; 130 break; 131 } 132 if (IPPROTO_IP == answer->protocol) 133 break; 134 } 135 err = -EPROTONOSUPPORT; 136 } 137 138 if (err) { 139 if (try_loading_module < 2) { 140 rcu_read_unlock(); 141 /* 142 * Be more specific, e.g. net-pf-10-proto-132-type-1 143 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 144 */ 145 if (++try_loading_module == 1) 146 request_module("net-pf-%d-proto-%d-type-%d", 147 PF_INET6, protocol, sock->type); 148 /* 149 * Fall back to generic, e.g. net-pf-10-proto-132 150 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 151 */ 152 else 153 request_module("net-pf-%d-proto-%d", 154 PF_INET6, protocol); 155 goto lookup_protocol; 156 } else 157 goto out_rcu_unlock; 158 } 159 160 err = -EPERM; 161 if (sock->type == SOCK_RAW && !kern && 162 !ns_capable(net->user_ns, CAP_NET_RAW)) 163 goto out_rcu_unlock; 164 165 sock->ops = answer->ops; 166 answer_prot = answer->prot; 167 answer_flags = answer->flags; 168 rcu_read_unlock(); 169 170 WARN_ON(!answer_prot->slab); 171 172 err = -ENOBUFS; 173 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern); 174 if (!sk) 175 goto out; 176 177 sock_init_data(sock, sk); 178 179 err = 0; 180 if (INET_PROTOSW_REUSE & answer_flags) 181 sk->sk_reuse = SK_CAN_REUSE; 182 183 inet = inet_sk(sk); 184 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 185 186 if (SOCK_RAW == sock->type) { 187 inet->inet_num = protocol; 188 if (IPPROTO_RAW == protocol) 189 inet->hdrincl = 1; 190 } 191 192 sk->sk_destruct = inet_sock_destruct; 193 sk->sk_family = PF_INET6; 194 sk->sk_protocol = protocol; 195 196 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 197 198 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 199 np->hop_limit = -1; 200 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; 201 np->mc_loop = 1; 202 np->pmtudisc = IPV6_PMTUDISC_WANT; 203 np->autoflowlabel = ip6_default_np_autolabel(sock_net(sk)); 204 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only; 205 206 /* Init the ipv4 part of the socket since we can have sockets 207 * using v6 API for ipv4. 208 */ 209 inet->uc_ttl = -1; 210 211 inet->mc_loop = 1; 212 inet->mc_ttl = 1; 213 inet->mc_index = 0; 214 inet->mc_list = NULL; 215 inet->rcv_tos = 0; 216 217 if (net->ipv4.sysctl_ip_no_pmtu_disc) 218 inet->pmtudisc = IP_PMTUDISC_DONT; 219 else 220 inet->pmtudisc = IP_PMTUDISC_WANT; 221 /* 222 * Increment only the relevant sk_prot->socks debug field, this changes 223 * the previous behaviour of incrementing both the equivalent to 224 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 225 * 226 * This allows better debug granularity as we'll know exactly how many 227 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 228 * transport protocol socks. -acme 229 */ 230 sk_refcnt_debug_inc(sk); 231 232 if (inet->inet_num) { 233 /* It assumes that any protocol which allows 234 * the user to assign a number at socket 235 * creation time automatically shares. 236 */ 237 inet->inet_sport = htons(inet->inet_num); 238 sk->sk_prot->hash(sk); 239 } 240 if (sk->sk_prot->init) { 241 err = sk->sk_prot->init(sk); 242 if (err) { 243 sk_common_release(sk); 244 goto out; 245 } 246 } 247 out: 248 return err; 249 out_rcu_unlock: 250 rcu_read_unlock(); 251 goto out; 252 } 253 254 255 /* bind for INET6 API */ 256 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 257 { 258 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr; 259 struct sock *sk = sock->sk; 260 struct inet_sock *inet = inet_sk(sk); 261 struct ipv6_pinfo *np = inet6_sk(sk); 262 struct net *net = sock_net(sk); 263 __be32 v4addr = 0; 264 unsigned short snum; 265 int addr_type = 0; 266 int err = 0; 267 268 /* If the socket has its own bind function then use it. */ 269 if (sk->sk_prot->bind) 270 return sk->sk_prot->bind(sk, uaddr, addr_len); 271 272 if (addr_len < SIN6_LEN_RFC2133) 273 return -EINVAL; 274 275 if (addr->sin6_family != AF_INET6) 276 return -EAFNOSUPPORT; 277 278 addr_type = ipv6_addr_type(&addr->sin6_addr); 279 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 280 return -EINVAL; 281 282 snum = ntohs(addr->sin6_port); 283 if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) 284 return -EACCES; 285 286 lock_sock(sk); 287 288 /* Check these errors (active socket, double bind). */ 289 if (sk->sk_state != TCP_CLOSE || inet->inet_num) { 290 err = -EINVAL; 291 goto out; 292 } 293 294 /* Check if the address belongs to the host. */ 295 if (addr_type == IPV6_ADDR_MAPPED) { 296 int chk_addr_ret; 297 298 /* Binding to v4-mapped address on a v6-only socket 299 * makes no sense 300 */ 301 if (sk->sk_ipv6only) { 302 err = -EINVAL; 303 goto out; 304 } 305 306 /* Reproduce AF_INET checks to make the bindings consistent */ 307 v4addr = addr->sin6_addr.s6_addr32[3]; 308 chk_addr_ret = inet_addr_type(net, v4addr); 309 if (!net->ipv4.sysctl_ip_nonlocal_bind && 310 !(inet->freebind || inet->transparent) && 311 v4addr != htonl(INADDR_ANY) && 312 chk_addr_ret != RTN_LOCAL && 313 chk_addr_ret != RTN_MULTICAST && 314 chk_addr_ret != RTN_BROADCAST) { 315 err = -EADDRNOTAVAIL; 316 goto out; 317 } 318 } else { 319 if (addr_type != IPV6_ADDR_ANY) { 320 struct net_device *dev = NULL; 321 322 rcu_read_lock(); 323 if (__ipv6_addr_needs_scope_id(addr_type)) { 324 if (addr_len >= sizeof(struct sockaddr_in6) && 325 addr->sin6_scope_id) { 326 /* Override any existing binding, if another one 327 * is supplied by user. 328 */ 329 sk->sk_bound_dev_if = addr->sin6_scope_id; 330 } 331 332 /* Binding to link-local address requires an interface */ 333 if (!sk->sk_bound_dev_if) { 334 err = -EINVAL; 335 goto out_unlock; 336 } 337 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 338 if (!dev) { 339 err = -ENODEV; 340 goto out_unlock; 341 } 342 } 343 344 /* ipv4 addr of the socket is invalid. Only the 345 * unspecified and mapped address have a v4 equivalent. 346 */ 347 v4addr = LOOPBACK4_IPV6; 348 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 349 if (!net->ipv6.sysctl.ip_nonlocal_bind && 350 !(inet->freebind || inet->transparent) && 351 !ipv6_chk_addr(net, &addr->sin6_addr, 352 dev, 0)) { 353 err = -EADDRNOTAVAIL; 354 goto out_unlock; 355 } 356 } 357 rcu_read_unlock(); 358 } 359 } 360 361 inet->inet_rcv_saddr = v4addr; 362 inet->inet_saddr = v4addr; 363 364 sk->sk_v6_rcv_saddr = addr->sin6_addr; 365 366 if (!(addr_type & IPV6_ADDR_MULTICAST)) 367 np->saddr = addr->sin6_addr; 368 369 /* Make sure we are allowed to bind here. */ 370 if ((snum || !inet->bind_address_no_port) && 371 sk->sk_prot->get_port(sk, snum)) { 372 inet_reset_saddr(sk); 373 err = -EADDRINUSE; 374 goto out; 375 } 376 377 if (addr_type != IPV6_ADDR_ANY) { 378 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 379 if (addr_type != IPV6_ADDR_MAPPED) 380 sk->sk_ipv6only = 1; 381 } 382 if (snum) 383 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 384 inet->inet_sport = htons(inet->inet_num); 385 inet->inet_dport = 0; 386 inet->inet_daddr = 0; 387 out: 388 release_sock(sk); 389 return err; 390 out_unlock: 391 rcu_read_unlock(); 392 goto out; 393 } 394 EXPORT_SYMBOL(inet6_bind); 395 396 int inet6_release(struct socket *sock) 397 { 398 struct sock *sk = sock->sk; 399 400 if (!sk) 401 return -EINVAL; 402 403 /* Free mc lists */ 404 ipv6_sock_mc_close(sk); 405 406 /* Free ac lists */ 407 ipv6_sock_ac_close(sk); 408 409 return inet_release(sock); 410 } 411 EXPORT_SYMBOL(inet6_release); 412 413 void inet6_destroy_sock(struct sock *sk) 414 { 415 struct ipv6_pinfo *np = inet6_sk(sk); 416 struct sk_buff *skb; 417 struct ipv6_txoptions *opt; 418 419 /* Release rx options */ 420 421 skb = xchg(&np->pktoptions, NULL); 422 if (skb) 423 kfree_skb(skb); 424 425 skb = xchg(&np->rxpmtu, NULL); 426 if (skb) 427 kfree_skb(skb); 428 429 /* Free flowlabels */ 430 fl6_free_socklist(sk); 431 432 /* Free tx options */ 433 434 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL); 435 if (opt) { 436 atomic_sub(opt->tot_len, &sk->sk_omem_alloc); 437 txopt_put(opt); 438 } 439 } 440 EXPORT_SYMBOL_GPL(inet6_destroy_sock); 441 442 /* 443 * This does both peername and sockname. 444 */ 445 446 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 447 int *uaddr_len, int peer) 448 { 449 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr; 450 struct sock *sk = sock->sk; 451 struct inet_sock *inet = inet_sk(sk); 452 struct ipv6_pinfo *np = inet6_sk(sk); 453 454 sin->sin6_family = AF_INET6; 455 sin->sin6_flowinfo = 0; 456 sin->sin6_scope_id = 0; 457 if (peer) { 458 if (!inet->inet_dport) 459 return -ENOTCONN; 460 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 461 peer == 1) 462 return -ENOTCONN; 463 sin->sin6_port = inet->inet_dport; 464 sin->sin6_addr = sk->sk_v6_daddr; 465 if (np->sndflow) 466 sin->sin6_flowinfo = np->flow_label; 467 } else { 468 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 469 sin->sin6_addr = np->saddr; 470 else 471 sin->sin6_addr = sk->sk_v6_rcv_saddr; 472 473 sin->sin6_port = inet->inet_sport; 474 } 475 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr, 476 sk->sk_bound_dev_if); 477 *uaddr_len = sizeof(*sin); 478 return 0; 479 } 480 EXPORT_SYMBOL(inet6_getname); 481 482 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 483 { 484 struct sock *sk = sock->sk; 485 struct net *net = sock_net(sk); 486 487 switch (cmd) { 488 case SIOCGSTAMP: 489 return sock_get_timestamp(sk, (struct timeval __user *)arg); 490 491 case SIOCGSTAMPNS: 492 return sock_get_timestampns(sk, (struct timespec __user *)arg); 493 494 case SIOCADDRT: 495 case SIOCDELRT: 496 497 return ipv6_route_ioctl(net, cmd, (void __user *)arg); 498 499 case SIOCSIFADDR: 500 return addrconf_add_ifaddr(net, (void __user *) arg); 501 case SIOCDIFADDR: 502 return addrconf_del_ifaddr(net, (void __user *) arg); 503 case SIOCSIFDSTADDR: 504 return addrconf_set_dstaddr(net, (void __user *) arg); 505 default: 506 if (!sk->sk_prot->ioctl) 507 return -ENOIOCTLCMD; 508 return sk->sk_prot->ioctl(sk, cmd, arg); 509 } 510 /*NOTREACHED*/ 511 return 0; 512 } 513 EXPORT_SYMBOL(inet6_ioctl); 514 515 const struct proto_ops inet6_stream_ops = { 516 .family = PF_INET6, 517 .owner = THIS_MODULE, 518 .release = inet6_release, 519 .bind = inet6_bind, 520 .connect = inet_stream_connect, /* ok */ 521 .socketpair = sock_no_socketpair, /* a do nothing */ 522 .accept = inet_accept, /* ok */ 523 .getname = inet6_getname, 524 .poll = tcp_poll, /* ok */ 525 .ioctl = inet6_ioctl, /* must change */ 526 .listen = inet_listen, /* ok */ 527 .shutdown = inet_shutdown, /* ok */ 528 .setsockopt = sock_common_setsockopt, /* ok */ 529 .getsockopt = sock_common_getsockopt, /* ok */ 530 .sendmsg = inet_sendmsg, /* ok */ 531 .recvmsg = inet_recvmsg, /* ok */ 532 .mmap = sock_no_mmap, 533 .sendpage = inet_sendpage, 534 .splice_read = tcp_splice_read, 535 #ifdef CONFIG_COMPAT 536 .compat_setsockopt = compat_sock_common_setsockopt, 537 .compat_getsockopt = compat_sock_common_getsockopt, 538 #endif 539 }; 540 541 const struct proto_ops inet6_dgram_ops = { 542 .family = PF_INET6, 543 .owner = THIS_MODULE, 544 .release = inet6_release, 545 .bind = inet6_bind, 546 .connect = inet_dgram_connect, /* ok */ 547 .socketpair = sock_no_socketpair, /* a do nothing */ 548 .accept = sock_no_accept, /* a do nothing */ 549 .getname = inet6_getname, 550 .poll = udp_poll, /* ok */ 551 .ioctl = inet6_ioctl, /* must change */ 552 .listen = sock_no_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 = sock_no_sendpage, 560 #ifdef CONFIG_COMPAT 561 .compat_setsockopt = compat_sock_common_setsockopt, 562 .compat_getsockopt = compat_sock_common_getsockopt, 563 #endif 564 }; 565 566 static const struct net_proto_family inet6_family_ops = { 567 .family = PF_INET6, 568 .create = inet6_create, 569 .owner = THIS_MODULE, 570 }; 571 572 int inet6_register_protosw(struct inet_protosw *p) 573 { 574 struct list_head *lh; 575 struct inet_protosw *answer; 576 struct list_head *last_perm; 577 int protocol = p->protocol; 578 int ret; 579 580 spin_lock_bh(&inetsw6_lock); 581 582 ret = -EINVAL; 583 if (p->type >= SOCK_MAX) 584 goto out_illegal; 585 586 /* If we are trying to override a permanent protocol, bail. */ 587 answer = NULL; 588 ret = -EPERM; 589 last_perm = &inetsw6[p->type]; 590 list_for_each(lh, &inetsw6[p->type]) { 591 answer = list_entry(lh, struct inet_protosw, list); 592 593 /* Check only the non-wild match. */ 594 if (INET_PROTOSW_PERMANENT & answer->flags) { 595 if (protocol == answer->protocol) 596 break; 597 last_perm = lh; 598 } 599 600 answer = NULL; 601 } 602 if (answer) 603 goto out_permanent; 604 605 /* Add the new entry after the last permanent entry if any, so that 606 * the new entry does not override a permanent entry when matched with 607 * a wild-card protocol. But it is allowed to override any existing 608 * non-permanent entry. This means that when we remove this entry, the 609 * system automatically returns to the old behavior. 610 */ 611 list_add_rcu(&p->list, last_perm); 612 ret = 0; 613 out: 614 spin_unlock_bh(&inetsw6_lock); 615 return ret; 616 617 out_permanent: 618 pr_err("Attempt to override permanent protocol %d\n", protocol); 619 goto out; 620 621 out_illegal: 622 pr_err("Ignoring attempt to register invalid socket type %d\n", 623 p->type); 624 goto out; 625 } 626 EXPORT_SYMBOL(inet6_register_protosw); 627 628 void 629 inet6_unregister_protosw(struct inet_protosw *p) 630 { 631 if (INET_PROTOSW_PERMANENT & p->flags) { 632 pr_err("Attempt to unregister permanent protocol %d\n", 633 p->protocol); 634 } else { 635 spin_lock_bh(&inetsw6_lock); 636 list_del_rcu(&p->list); 637 spin_unlock_bh(&inetsw6_lock); 638 639 synchronize_net(); 640 } 641 } 642 EXPORT_SYMBOL(inet6_unregister_protosw); 643 644 int inet6_sk_rebuild_header(struct sock *sk) 645 { 646 struct ipv6_pinfo *np = inet6_sk(sk); 647 struct dst_entry *dst; 648 649 dst = __sk_dst_check(sk, np->dst_cookie); 650 651 if (!dst) { 652 struct inet_sock *inet = inet_sk(sk); 653 struct in6_addr *final_p, final; 654 struct flowi6 fl6; 655 656 memset(&fl6, 0, sizeof(fl6)); 657 fl6.flowi6_proto = sk->sk_protocol; 658 fl6.daddr = sk->sk_v6_daddr; 659 fl6.saddr = np->saddr; 660 fl6.flowlabel = np->flow_label; 661 fl6.flowi6_oif = sk->sk_bound_dev_if; 662 fl6.flowi6_mark = sk->sk_mark; 663 fl6.fl6_dport = inet->inet_dport; 664 fl6.fl6_sport = inet->inet_sport; 665 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 666 667 rcu_read_lock(); 668 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), 669 &final); 670 rcu_read_unlock(); 671 672 dst = ip6_dst_lookup_flow(sk, &fl6, final_p); 673 if (IS_ERR(dst)) { 674 sk->sk_route_caps = 0; 675 sk->sk_err_soft = -PTR_ERR(dst); 676 return PTR_ERR(dst); 677 } 678 679 ip6_dst_store(sk, dst, NULL, NULL); 680 } 681 682 return 0; 683 } 684 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 685 686 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, 687 const struct inet6_skb_parm *opt) 688 { 689 const struct ipv6_pinfo *np = inet6_sk(sk); 690 691 if (np->rxopt.all) { 692 if (((opt->flags & IP6SKB_HOPBYHOP) && 693 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) || 694 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) && 695 np->rxopt.bits.rxflow) || 696 (opt->srcrt && (np->rxopt.bits.srcrt || 697 np->rxopt.bits.osrcrt)) || 698 ((opt->dst1 || opt->dst0) && 699 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 700 return true; 701 } 702 return false; 703 } 704 EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 705 706 static struct packet_type ipv6_packet_type __read_mostly = { 707 .type = cpu_to_be16(ETH_P_IPV6), 708 .func = ipv6_rcv, 709 }; 710 711 static int __init ipv6_packet_init(void) 712 { 713 dev_add_pack(&ipv6_packet_type); 714 return 0; 715 } 716 717 static void ipv6_packet_cleanup(void) 718 { 719 dev_remove_pack(&ipv6_packet_type); 720 } 721 722 static int __net_init ipv6_init_mibs(struct net *net) 723 { 724 int i; 725 726 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib); 727 if (!net->mib.udp_stats_in6) 728 return -ENOMEM; 729 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib); 730 if (!net->mib.udplite_stats_in6) 731 goto err_udplite_mib; 732 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib); 733 if (!net->mib.ipv6_statistics) 734 goto err_ip_mib; 735 736 for_each_possible_cpu(i) { 737 struct ipstats_mib *af_inet6_stats; 738 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i); 739 u64_stats_init(&af_inet6_stats->syncp); 740 } 741 742 743 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib); 744 if (!net->mib.icmpv6_statistics) 745 goto err_icmp_mib; 746 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib), 747 GFP_KERNEL); 748 if (!net->mib.icmpv6msg_statistics) 749 goto err_icmpmsg_mib; 750 return 0; 751 752 err_icmpmsg_mib: 753 free_percpu(net->mib.icmpv6_statistics); 754 err_icmp_mib: 755 free_percpu(net->mib.ipv6_statistics); 756 err_ip_mib: 757 free_percpu(net->mib.udplite_stats_in6); 758 err_udplite_mib: 759 free_percpu(net->mib.udp_stats_in6); 760 return -ENOMEM; 761 } 762 763 static void ipv6_cleanup_mibs(struct net *net) 764 { 765 free_percpu(net->mib.udp_stats_in6); 766 free_percpu(net->mib.udplite_stats_in6); 767 free_percpu(net->mib.ipv6_statistics); 768 free_percpu(net->mib.icmpv6_statistics); 769 kfree(net->mib.icmpv6msg_statistics); 770 } 771 772 static int __net_init inet6_net_init(struct net *net) 773 { 774 int err = 0; 775 776 net->ipv6.sysctl.bindv6only = 0; 777 net->ipv6.sysctl.icmpv6_time = 1*HZ; 778 net->ipv6.sysctl.flowlabel_consistency = 1; 779 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS; 780 net->ipv6.sysctl.idgen_retries = 3; 781 net->ipv6.sysctl.idgen_delay = 1 * HZ; 782 net->ipv6.sysctl.flowlabel_state_ranges = 0; 783 atomic_set(&net->ipv6.fib6_sernum, 1); 784 785 err = ipv6_init_mibs(net); 786 if (err) 787 return err; 788 #ifdef CONFIG_PROC_FS 789 err = udp6_proc_init(net); 790 if (err) 791 goto out; 792 err = tcp6_proc_init(net); 793 if (err) 794 goto proc_tcp6_fail; 795 err = ac6_proc_init(net); 796 if (err) 797 goto proc_ac6_fail; 798 #endif 799 return err; 800 801 #ifdef CONFIG_PROC_FS 802 proc_ac6_fail: 803 tcp6_proc_exit(net); 804 proc_tcp6_fail: 805 udp6_proc_exit(net); 806 out: 807 ipv6_cleanup_mibs(net); 808 return err; 809 #endif 810 } 811 812 static void __net_exit inet6_net_exit(struct net *net) 813 { 814 #ifdef CONFIG_PROC_FS 815 udp6_proc_exit(net); 816 tcp6_proc_exit(net); 817 ac6_proc_exit(net); 818 #endif 819 ipv6_cleanup_mibs(net); 820 } 821 822 static struct pernet_operations inet6_net_ops = { 823 .init = inet6_net_init, 824 .exit = inet6_net_exit, 825 }; 826 827 static const struct ipv6_stub ipv6_stub_impl = { 828 .ipv6_sock_mc_join = ipv6_sock_mc_join, 829 .ipv6_sock_mc_drop = ipv6_sock_mc_drop, 830 .ipv6_dst_lookup = ip6_dst_lookup, 831 .udpv6_encap_enable = udpv6_encap_enable, 832 .ndisc_send_na = ndisc_send_na, 833 .nd_tbl = &nd_tbl, 834 }; 835 836 static int __init inet6_init(void) 837 { 838 struct list_head *r; 839 int err = 0; 840 841 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm)); 842 843 /* Register the socket-side information for inet6_create. */ 844 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 845 INIT_LIST_HEAD(r); 846 847 if (disable_ipv6_mod) { 848 pr_info("Loaded, but administratively disabled, reboot required to enable\n"); 849 goto out; 850 } 851 852 err = proto_register(&tcpv6_prot, 1); 853 if (err) 854 goto out; 855 856 err = proto_register(&udpv6_prot, 1); 857 if (err) 858 goto out_unregister_tcp_proto; 859 860 err = proto_register(&udplitev6_prot, 1); 861 if (err) 862 goto out_unregister_udp_proto; 863 864 err = proto_register(&rawv6_prot, 1); 865 if (err) 866 goto out_unregister_udplite_proto; 867 868 err = proto_register(&pingv6_prot, 1); 869 if (err) 870 goto out_unregister_ping_proto; 871 872 /* We MUST register RAW sockets before we create the ICMP6, 873 * IGMP6, or NDISC control sockets. 874 */ 875 err = rawv6_init(); 876 if (err) 877 goto out_unregister_raw_proto; 878 879 /* Register the family here so that the init calls below will 880 * be able to create sockets. (?? is this dangerous ??) 881 */ 882 err = sock_register(&inet6_family_ops); 883 if (err) 884 goto out_sock_register_fail; 885 886 /* 887 * ipngwg API draft makes clear that the correct semantics 888 * for TCP and UDP is to consider one TCP and UDP instance 889 * in a host available by both INET and INET6 APIs and 890 * able to communicate via both network protocols. 891 */ 892 893 err = register_pernet_subsys(&inet6_net_ops); 894 if (err) 895 goto register_pernet_fail; 896 err = icmpv6_init(); 897 if (err) 898 goto icmp_fail; 899 err = ip6_mr_init(); 900 if (err) 901 goto ipmr_fail; 902 err = ndisc_init(); 903 if (err) 904 goto ndisc_fail; 905 err = igmp6_init(); 906 if (err) 907 goto igmp_fail; 908 909 ipv6_stub = &ipv6_stub_impl; 910 911 err = ipv6_netfilter_init(); 912 if (err) 913 goto netfilter_fail; 914 /* Create /proc/foo6 entries. */ 915 #ifdef CONFIG_PROC_FS 916 err = -ENOMEM; 917 if (raw6_proc_init()) 918 goto proc_raw6_fail; 919 if (udplite6_proc_init()) 920 goto proc_udplite6_fail; 921 if (ipv6_misc_proc_init()) 922 goto proc_misc6_fail; 923 if (if6_proc_init()) 924 goto proc_if6_fail; 925 #endif 926 err = ip6_route_init(); 927 if (err) 928 goto ip6_route_fail; 929 err = ndisc_late_init(); 930 if (err) 931 goto ndisc_late_fail; 932 err = ip6_flowlabel_init(); 933 if (err) 934 goto ip6_flowlabel_fail; 935 err = addrconf_init(); 936 if (err) 937 goto addrconf_fail; 938 939 /* Init v6 extension headers. */ 940 err = ipv6_exthdrs_init(); 941 if (err) 942 goto ipv6_exthdrs_fail; 943 944 err = ipv6_frag_init(); 945 if (err) 946 goto ipv6_frag_fail; 947 948 /* Init v6 transport protocols. */ 949 err = udpv6_init(); 950 if (err) 951 goto udpv6_fail; 952 953 err = udplitev6_init(); 954 if (err) 955 goto udplitev6_fail; 956 957 err = tcpv6_init(); 958 if (err) 959 goto tcpv6_fail; 960 961 err = ipv6_packet_init(); 962 if (err) 963 goto ipv6_packet_fail; 964 965 err = pingv6_init(); 966 if (err) 967 goto pingv6_fail; 968 969 #ifdef CONFIG_SYSCTL 970 err = ipv6_sysctl_register(); 971 if (err) 972 goto sysctl_fail; 973 #endif 974 out: 975 return err; 976 977 #ifdef CONFIG_SYSCTL 978 sysctl_fail: 979 pingv6_exit(); 980 #endif 981 pingv6_fail: 982 ipv6_packet_cleanup(); 983 ipv6_packet_fail: 984 tcpv6_exit(); 985 tcpv6_fail: 986 udplitev6_exit(); 987 udplitev6_fail: 988 udpv6_exit(); 989 udpv6_fail: 990 ipv6_frag_exit(); 991 ipv6_frag_fail: 992 ipv6_exthdrs_exit(); 993 ipv6_exthdrs_fail: 994 addrconf_cleanup(); 995 addrconf_fail: 996 ip6_flowlabel_cleanup(); 997 ip6_flowlabel_fail: 998 ndisc_late_cleanup(); 999 ndisc_late_fail: 1000 ip6_route_cleanup(); 1001 ip6_route_fail: 1002 #ifdef CONFIG_PROC_FS 1003 if6_proc_exit(); 1004 proc_if6_fail: 1005 ipv6_misc_proc_exit(); 1006 proc_misc6_fail: 1007 udplite6_proc_exit(); 1008 proc_udplite6_fail: 1009 raw6_proc_exit(); 1010 proc_raw6_fail: 1011 #endif 1012 ipv6_netfilter_fini(); 1013 netfilter_fail: 1014 igmp6_cleanup(); 1015 igmp_fail: 1016 ndisc_cleanup(); 1017 ndisc_fail: 1018 ip6_mr_cleanup(); 1019 ipmr_fail: 1020 icmpv6_cleanup(); 1021 icmp_fail: 1022 unregister_pernet_subsys(&inet6_net_ops); 1023 register_pernet_fail: 1024 sock_unregister(PF_INET6); 1025 rtnl_unregister_all(PF_INET6); 1026 out_sock_register_fail: 1027 rawv6_exit(); 1028 out_unregister_ping_proto: 1029 proto_unregister(&pingv6_prot); 1030 out_unregister_raw_proto: 1031 proto_unregister(&rawv6_prot); 1032 out_unregister_udplite_proto: 1033 proto_unregister(&udplitev6_prot); 1034 out_unregister_udp_proto: 1035 proto_unregister(&udpv6_prot); 1036 out_unregister_tcp_proto: 1037 proto_unregister(&tcpv6_prot); 1038 goto out; 1039 } 1040 module_init(inet6_init); 1041 1042 MODULE_ALIAS_NETPROTO(PF_INET6); 1043