af_inet6.c revision 41a76906b3225997036efd88cbaae69d60b1e947
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 * $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $ 11 * 12 * Fixes: 13 * piggy, Karl Knutson : Socket protocol table 14 * Hideaki YOSHIFUJI : sin6_scope_id support 15 * Arnaldo Melo : check proc_net_create return, cleanups 16 * 17 * This program is free software; you can redistribute it and/or 18 * modify it under the terms of the GNU General Public License 19 * as published by the Free Software Foundation; either version 20 * 2 of the License, or (at your option) any later version. 21 */ 22 23 24#include <linux/module.h> 25#include <linux/capability.h> 26#include <linux/errno.h> 27#include <linux/types.h> 28#include <linux/socket.h> 29#include <linux/in.h> 30#include <linux/kernel.h> 31#include <linux/timer.h> 32#include <linux/string.h> 33#include <linux/sockios.h> 34#include <linux/net.h> 35#include <linux/fcntl.h> 36#include <linux/mm.h> 37#include <linux/interrupt.h> 38#include <linux/proc_fs.h> 39#include <linux/stat.h> 40#include <linux/init.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/ipip.h> 53#include <net/protocol.h> 54#include <net/inet_common.h> 55#include <net/transp_v6.h> 56#include <net/ip6_route.h> 57#include <net/addrconf.h> 58#ifdef CONFIG_IPV6_TUNNEL 59#include <net/ip6_tunnel.h> 60#endif 61 62#include <asm/uaccess.h> 63#include <asm/system.h> 64 65MODULE_AUTHOR("Cast of dozens"); 66MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); 67MODULE_LICENSE("GPL"); 68 69/* The inetsw6 table contains everything that inet6_create needs to 70 * build a new socket. 71 */ 72static struct list_head inetsw6[SOCK_MAX]; 73static DEFINE_SPINLOCK(inetsw6_lock); 74 75void ipv6_frag_sysctl_init(struct net *net); 76 77static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) 78{ 79 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); 80 81 return (struct ipv6_pinfo *)(((u8 *)sk) + offset); 82} 83 84static int inet6_create(struct net *net, struct socket *sock, int protocol) 85{ 86 struct inet_sock *inet; 87 struct ipv6_pinfo *np; 88 struct sock *sk; 89 struct list_head *p; 90 struct inet_protosw *answer; 91 struct proto *answer_prot; 92 unsigned char answer_flags; 93 char answer_no_check; 94 int try_loading_module = 0; 95 int err; 96 97 if (net != &init_net) 98 return -EAFNOSUPPORT; 99 100 if (sock->type != SOCK_RAW && 101 sock->type != SOCK_DGRAM && 102 !inet_ehash_secret) 103 build_ehash_secret(); 104 105 /* Look for the requested type/protocol pair. */ 106 answer = NULL; 107lookup_protocol: 108 err = -ESOCKTNOSUPPORT; 109 rcu_read_lock(); 110 list_for_each_rcu(p, &inetsw6[sock->type]) { 111 answer = list_entry(p, struct inet_protosw, list); 112 113 /* Check the non-wild match. */ 114 if (protocol == answer->protocol) { 115 if (protocol != IPPROTO_IP) 116 break; 117 } else { 118 /* Check for the two wild cases. */ 119 if (IPPROTO_IP == protocol) { 120 protocol = answer->protocol; 121 break; 122 } 123 if (IPPROTO_IP == answer->protocol) 124 break; 125 } 126 err = -EPROTONOSUPPORT; 127 answer = NULL; 128 } 129 130 if (!answer) { 131 if (try_loading_module < 2) { 132 rcu_read_unlock(); 133 /* 134 * Be more specific, e.g. net-pf-10-proto-132-type-1 135 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) 136 */ 137 if (++try_loading_module == 1) 138 request_module("net-pf-%d-proto-%d-type-%d", 139 PF_INET6, protocol, sock->type); 140 /* 141 * Fall back to generic, e.g. net-pf-10-proto-132 142 * (net-pf-PF_INET6-proto-IPPROTO_SCTP) 143 */ 144 else 145 request_module("net-pf-%d-proto-%d", 146 PF_INET6, protocol); 147 goto lookup_protocol; 148 } else 149 goto out_rcu_unlock; 150 } 151 152 err = -EPERM; 153 if (answer->capability > 0 && !capable(answer->capability)) 154 goto out_rcu_unlock; 155 156 sock->ops = answer->ops; 157 answer_prot = answer->prot; 158 answer_no_check = answer->no_check; 159 answer_flags = answer->flags; 160 rcu_read_unlock(); 161 162 BUG_TRAP(answer_prot->slab != NULL); 163 164 err = -ENOBUFS; 165 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot); 166 if (sk == NULL) 167 goto out; 168 169 sock_init_data(sock, sk); 170 171 err = 0; 172 sk->sk_no_check = answer_no_check; 173 if (INET_PROTOSW_REUSE & answer_flags) 174 sk->sk_reuse = 1; 175 176 inet = inet_sk(sk); 177 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; 178 179 if (SOCK_RAW == sock->type) { 180 inet->num = protocol; 181 if (IPPROTO_RAW == protocol) 182 inet->hdrincl = 1; 183 } 184 185 sk->sk_destruct = inet_sock_destruct; 186 sk->sk_family = PF_INET6; 187 sk->sk_protocol = protocol; 188 189 sk->sk_backlog_rcv = answer->prot->backlog_rcv; 190 191 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); 192 np->hop_limit = -1; 193 np->mcast_hops = -1; 194 np->mc_loop = 1; 195 np->pmtudisc = IPV6_PMTUDISC_WANT; 196 np->ipv6only = init_net.ipv6.sysctl.bindv6only; 197 198 /* Init the ipv4 part of the socket since we can have sockets 199 * using v6 API for ipv4. 200 */ 201 inet->uc_ttl = -1; 202 203 inet->mc_loop = 1; 204 inet->mc_ttl = 1; 205 inet->mc_index = 0; 206 inet->mc_list = NULL; 207 208 if (ipv4_config.no_pmtu_disc) 209 inet->pmtudisc = IP_PMTUDISC_DONT; 210 else 211 inet->pmtudisc = IP_PMTUDISC_WANT; 212 /* 213 * Increment only the relevant sk_prot->socks debug field, this changes 214 * the previous behaviour of incrementing both the equivalent to 215 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. 216 * 217 * This allows better debug granularity as we'll know exactly how many 218 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 219 * transport protocol socks. -acme 220 */ 221 sk_refcnt_debug_inc(sk); 222 223 if (inet->num) { 224 /* It assumes that any protocol which allows 225 * the user to assign a number at socket 226 * creation time automatically shares. 227 */ 228 inet->sport = htons(inet->num); 229 sk->sk_prot->hash(sk); 230 } 231 if (sk->sk_prot->init) { 232 err = sk->sk_prot->init(sk); 233 if (err) { 234 sk_common_release(sk); 235 goto out; 236 } 237 } 238out: 239 return err; 240out_rcu_unlock: 241 rcu_read_unlock(); 242 goto out; 243} 244 245 246/* bind for INET6 API */ 247int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) 248{ 249 struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr; 250 struct sock *sk = sock->sk; 251 struct inet_sock *inet = inet_sk(sk); 252 struct ipv6_pinfo *np = inet6_sk(sk); 253 __be32 v4addr = 0; 254 unsigned short snum; 255 int addr_type = 0; 256 int err = 0; 257 258 /* If the socket has its own bind function then use it. */ 259 if (sk->sk_prot->bind) 260 return sk->sk_prot->bind(sk, uaddr, addr_len); 261 262 if (addr_len < SIN6_LEN_RFC2133) 263 return -EINVAL; 264 addr_type = ipv6_addr_type(&addr->sin6_addr); 265 if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM) 266 return -EINVAL; 267 268 snum = ntohs(addr->sin6_port); 269 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) 270 return -EACCES; 271 272 lock_sock(sk); 273 274 /* Check these errors (active socket, double bind). */ 275 if (sk->sk_state != TCP_CLOSE || inet->num) { 276 err = -EINVAL; 277 goto out; 278 } 279 280 /* Check if the address belongs to the host. */ 281 if (addr_type == IPV6_ADDR_MAPPED) { 282 v4addr = addr->sin6_addr.s6_addr32[3]; 283 if (inet_addr_type(v4addr) != RTN_LOCAL) { 284 err = -EADDRNOTAVAIL; 285 goto out; 286 } 287 } else { 288 if (addr_type != IPV6_ADDR_ANY) { 289 struct net_device *dev = NULL; 290 291 if (addr_type & IPV6_ADDR_LINKLOCAL) { 292 if (addr_len >= sizeof(struct sockaddr_in6) && 293 addr->sin6_scope_id) { 294 /* Override any existing binding, if another one 295 * is supplied by user. 296 */ 297 sk->sk_bound_dev_if = addr->sin6_scope_id; 298 } 299 300 /* Binding to link-local address requires an interface */ 301 if (!sk->sk_bound_dev_if) { 302 err = -EINVAL; 303 goto out; 304 } 305 dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if); 306 if (!dev) { 307 err = -ENODEV; 308 goto out; 309 } 310 } 311 312 /* ipv4 addr of the socket is invalid. Only the 313 * unspecified and mapped address have a v4 equivalent. 314 */ 315 v4addr = LOOPBACK4_IPV6; 316 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 317 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) { 318 if (dev) 319 dev_put(dev); 320 err = -EADDRNOTAVAIL; 321 goto out; 322 } 323 } 324 if (dev) 325 dev_put(dev); 326 } 327 } 328 329 inet->rcv_saddr = v4addr; 330 inet->saddr = v4addr; 331 332 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); 333 334 if (!(addr_type & IPV6_ADDR_MULTICAST)) 335 ipv6_addr_copy(&np->saddr, &addr->sin6_addr); 336 337 /* Make sure we are allowed to bind here. */ 338 if (sk->sk_prot->get_port(sk, snum)) { 339 inet_reset_saddr(sk); 340 err = -EADDRINUSE; 341 goto out; 342 } 343 344 if (addr_type != IPV6_ADDR_ANY) 345 sk->sk_userlocks |= SOCK_BINDADDR_LOCK; 346 if (snum) 347 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 348 inet->sport = htons(inet->num); 349 inet->dport = 0; 350 inet->daddr = 0; 351out: 352 release_sock(sk); 353 return err; 354} 355 356EXPORT_SYMBOL(inet6_bind); 357 358int inet6_release(struct socket *sock) 359{ 360 struct sock *sk = sock->sk; 361 362 if (sk == NULL) 363 return -EINVAL; 364 365 /* Free mc lists */ 366 ipv6_sock_mc_close(sk); 367 368 /* Free ac lists */ 369 ipv6_sock_ac_close(sk); 370 371 return inet_release(sock); 372} 373 374EXPORT_SYMBOL(inet6_release); 375 376int inet6_destroy_sock(struct sock *sk) 377{ 378 struct ipv6_pinfo *np = inet6_sk(sk); 379 struct sk_buff *skb; 380 struct ipv6_txoptions *opt; 381 382 /* Release rx options */ 383 384 if ((skb = xchg(&np->pktoptions, NULL)) != NULL) 385 kfree_skb(skb); 386 387 /* Free flowlabels */ 388 fl6_free_socklist(sk); 389 390 /* Free tx options */ 391 392 if ((opt = xchg(&np->opt, NULL)) != NULL) 393 sock_kfree_s(sk, opt, opt->tot_len); 394 395 return 0; 396} 397 398EXPORT_SYMBOL_GPL(inet6_destroy_sock); 399 400/* 401 * This does both peername and sockname. 402 */ 403 404int inet6_getname(struct socket *sock, struct sockaddr *uaddr, 405 int *uaddr_len, int peer) 406{ 407 struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr; 408 struct sock *sk = sock->sk; 409 struct inet_sock *inet = inet_sk(sk); 410 struct ipv6_pinfo *np = inet6_sk(sk); 411 412 sin->sin6_family = AF_INET6; 413 sin->sin6_flowinfo = 0; 414 sin->sin6_scope_id = 0; 415 if (peer) { 416 if (!inet->dport) 417 return -ENOTCONN; 418 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && 419 peer == 1) 420 return -ENOTCONN; 421 sin->sin6_port = inet->dport; 422 ipv6_addr_copy(&sin->sin6_addr, &np->daddr); 423 if (np->sndflow) 424 sin->sin6_flowinfo = np->flow_label; 425 } else { 426 if (ipv6_addr_any(&np->rcv_saddr)) 427 ipv6_addr_copy(&sin->sin6_addr, &np->saddr); 428 else 429 ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); 430 431 sin->sin6_port = inet->sport; 432 } 433 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) 434 sin->sin6_scope_id = sk->sk_bound_dev_if; 435 *uaddr_len = sizeof(*sin); 436 return(0); 437} 438 439EXPORT_SYMBOL(inet6_getname); 440 441int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 442{ 443 struct sock *sk = sock->sk; 444 445 switch(cmd) 446 { 447 case SIOCGSTAMP: 448 return sock_get_timestamp(sk, (struct timeval __user *)arg); 449 450 case SIOCGSTAMPNS: 451 return sock_get_timestampns(sk, (struct timespec __user *)arg); 452 453 case SIOCADDRT: 454 case SIOCDELRT: 455 456 return(ipv6_route_ioctl(cmd,(void __user *)arg)); 457 458 case SIOCSIFADDR: 459 return addrconf_add_ifaddr((void __user *) arg); 460 case SIOCDIFADDR: 461 return addrconf_del_ifaddr((void __user *) arg); 462 case SIOCSIFDSTADDR: 463 return addrconf_set_dstaddr((void __user *) arg); 464 default: 465 if (!sk->sk_prot->ioctl) 466 return -ENOIOCTLCMD; 467 return sk->sk_prot->ioctl(sk, cmd, arg); 468 } 469 /*NOTREACHED*/ 470 return(0); 471} 472 473EXPORT_SYMBOL(inet6_ioctl); 474 475const struct proto_ops inet6_stream_ops = { 476 .family = PF_INET6, 477 .owner = THIS_MODULE, 478 .release = inet6_release, 479 .bind = inet6_bind, 480 .connect = inet_stream_connect, /* ok */ 481 .socketpair = sock_no_socketpair, /* a do nothing */ 482 .accept = inet_accept, /* ok */ 483 .getname = inet6_getname, 484 .poll = tcp_poll, /* ok */ 485 .ioctl = inet6_ioctl, /* must change */ 486 .listen = inet_listen, /* ok */ 487 .shutdown = inet_shutdown, /* ok */ 488 .setsockopt = sock_common_setsockopt, /* ok */ 489 .getsockopt = sock_common_getsockopt, /* ok */ 490 .sendmsg = tcp_sendmsg, /* ok */ 491 .recvmsg = sock_common_recvmsg, /* ok */ 492 .mmap = sock_no_mmap, 493 .sendpage = tcp_sendpage, 494 .splice_read = tcp_splice_read, 495#ifdef CONFIG_COMPAT 496 .compat_setsockopt = compat_sock_common_setsockopt, 497 .compat_getsockopt = compat_sock_common_getsockopt, 498#endif 499}; 500 501const struct proto_ops inet6_dgram_ops = { 502 .family = PF_INET6, 503 .owner = THIS_MODULE, 504 .release = inet6_release, 505 .bind = inet6_bind, 506 .connect = inet_dgram_connect, /* ok */ 507 .socketpair = sock_no_socketpair, /* a do nothing */ 508 .accept = sock_no_accept, /* a do nothing */ 509 .getname = inet6_getname, 510 .poll = udp_poll, /* ok */ 511 .ioctl = inet6_ioctl, /* must change */ 512 .listen = sock_no_listen, /* ok */ 513 .shutdown = inet_shutdown, /* ok */ 514 .setsockopt = sock_common_setsockopt, /* ok */ 515 .getsockopt = sock_common_getsockopt, /* ok */ 516 .sendmsg = inet_sendmsg, /* ok */ 517 .recvmsg = sock_common_recvmsg, /* ok */ 518 .mmap = sock_no_mmap, 519 .sendpage = sock_no_sendpage, 520#ifdef CONFIG_COMPAT 521 .compat_setsockopt = compat_sock_common_setsockopt, 522 .compat_getsockopt = compat_sock_common_getsockopt, 523#endif 524}; 525 526static struct net_proto_family inet6_family_ops = { 527 .family = PF_INET6, 528 .create = inet6_create, 529 .owner = THIS_MODULE, 530}; 531 532int inet6_register_protosw(struct inet_protosw *p) 533{ 534 struct list_head *lh; 535 struct inet_protosw *answer; 536 struct list_head *last_perm; 537 int protocol = p->protocol; 538 int ret; 539 540 spin_lock_bh(&inetsw6_lock); 541 542 ret = -EINVAL; 543 if (p->type >= SOCK_MAX) 544 goto out_illegal; 545 546 /* If we are trying to override a permanent protocol, bail. */ 547 answer = NULL; 548 ret = -EPERM; 549 last_perm = &inetsw6[p->type]; 550 list_for_each(lh, &inetsw6[p->type]) { 551 answer = list_entry(lh, struct inet_protosw, list); 552 553 /* Check only the non-wild match. */ 554 if (INET_PROTOSW_PERMANENT & answer->flags) { 555 if (protocol == answer->protocol) 556 break; 557 last_perm = lh; 558 } 559 560 answer = NULL; 561 } 562 if (answer) 563 goto out_permanent; 564 565 /* Add the new entry after the last permanent entry if any, so that 566 * the new entry does not override a permanent entry when matched with 567 * a wild-card protocol. But it is allowed to override any existing 568 * non-permanent entry. This means that when we remove this entry, the 569 * system automatically returns to the old behavior. 570 */ 571 list_add_rcu(&p->list, last_perm); 572 ret = 0; 573out: 574 spin_unlock_bh(&inetsw6_lock); 575 return ret; 576 577out_permanent: 578 printk(KERN_ERR "Attempt to override permanent protocol %d.\n", 579 protocol); 580 goto out; 581 582out_illegal: 583 printk(KERN_ERR 584 "Ignoring attempt to register invalid socket type %d.\n", 585 p->type); 586 goto out; 587} 588 589EXPORT_SYMBOL(inet6_register_protosw); 590 591void 592inet6_unregister_protosw(struct inet_protosw *p) 593{ 594 if (INET_PROTOSW_PERMANENT & p->flags) { 595 printk(KERN_ERR 596 "Attempt to unregister permanent protocol %d.\n", 597 p->protocol); 598 } else { 599 spin_lock_bh(&inetsw6_lock); 600 list_del_rcu(&p->list); 601 spin_unlock_bh(&inetsw6_lock); 602 603 synchronize_net(); 604 } 605} 606 607EXPORT_SYMBOL(inet6_unregister_protosw); 608 609int inet6_sk_rebuild_header(struct sock *sk) 610{ 611 int err; 612 struct dst_entry *dst; 613 struct ipv6_pinfo *np = inet6_sk(sk); 614 615 dst = __sk_dst_check(sk, np->dst_cookie); 616 617 if (dst == NULL) { 618 struct inet_sock *inet = inet_sk(sk); 619 struct in6_addr *final_p = NULL, final; 620 struct flowi fl; 621 622 memset(&fl, 0, sizeof(fl)); 623 fl.proto = sk->sk_protocol; 624 ipv6_addr_copy(&fl.fl6_dst, &np->daddr); 625 ipv6_addr_copy(&fl.fl6_src, &np->saddr); 626 fl.fl6_flowlabel = np->flow_label; 627 fl.oif = sk->sk_bound_dev_if; 628 fl.fl_ip_dport = inet->dport; 629 fl.fl_ip_sport = inet->sport; 630 security_sk_classify_flow(sk, &fl); 631 632 if (np->opt && np->opt->srcrt) { 633 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; 634 ipv6_addr_copy(&final, &fl.fl6_dst); 635 ipv6_addr_copy(&fl.fl6_dst, rt0->addr); 636 final_p = &final; 637 } 638 639 err = ip6_dst_lookup(sk, &dst, &fl); 640 if (err) { 641 sk->sk_route_caps = 0; 642 return err; 643 } 644 if (final_p) 645 ipv6_addr_copy(&fl.fl6_dst, final_p); 646 647 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { 648 sk->sk_err_soft = -err; 649 return err; 650 } 651 652 __ip6_dst_store(sk, dst, NULL, NULL); 653 } 654 655 return 0; 656} 657 658EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); 659 660int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) 661{ 662 struct ipv6_pinfo *np = inet6_sk(sk); 663 struct inet6_skb_parm *opt = IP6CB(skb); 664 665 if (np->rxopt.all) { 666 if ((opt->hop && (np->rxopt.bits.hopopts || 667 np->rxopt.bits.ohopopts)) || 668 ((IPV6_FLOWINFO_MASK & 669 *(__be32 *)skb_network_header(skb)) && 670 np->rxopt.bits.rxflow) || 671 (opt->srcrt && (np->rxopt.bits.srcrt || 672 np->rxopt.bits.osrcrt)) || 673 ((opt->dst1 || opt->dst0) && 674 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) 675 return 1; 676 } 677 return 0; 678} 679 680EXPORT_SYMBOL_GPL(ipv6_opt_accepted); 681 682static int __init init_ipv6_mibs(void) 683{ 684 if (snmp_mib_init((void **)ipv6_statistics, 685 sizeof(struct ipstats_mib)) < 0) 686 goto err_ip_mib; 687 if (snmp_mib_init((void **)icmpv6_statistics, 688 sizeof(struct icmpv6_mib)) < 0) 689 goto err_icmp_mib; 690 if (snmp_mib_init((void **)icmpv6msg_statistics, 691 sizeof(struct icmpv6msg_mib)) < 0) 692 goto err_icmpmsg_mib; 693 if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0) 694 goto err_udp_mib; 695 if (snmp_mib_init((void **)udplite_stats_in6, 696 sizeof (struct udp_mib)) < 0) 697 goto err_udplite_mib; 698 return 0; 699 700err_udplite_mib: 701 snmp_mib_free((void **)udp_stats_in6); 702err_udp_mib: 703 snmp_mib_free((void **)icmpv6msg_statistics); 704err_icmpmsg_mib: 705 snmp_mib_free((void **)icmpv6_statistics); 706err_icmp_mib: 707 snmp_mib_free((void **)ipv6_statistics); 708err_ip_mib: 709 return -ENOMEM; 710 711} 712 713static void cleanup_ipv6_mibs(void) 714{ 715 snmp_mib_free((void **)ipv6_statistics); 716 snmp_mib_free((void **)icmpv6_statistics); 717 snmp_mib_free((void **)icmpv6msg_statistics); 718 snmp_mib_free((void **)udp_stats_in6); 719 snmp_mib_free((void **)udplite_stats_in6); 720} 721 722static int inet6_net_init(struct net *net) 723{ 724 net->ipv6.sysctl.bindv6only = 0; 725 net->ipv6.sysctl.frags.high_thresh = 256 * 1024; 726 net->ipv6.sysctl.frags.low_thresh = 192 * 1024; 727 net->ipv6.sysctl.frags.timeout = IPV6_FRAG_TIMEOUT; 728 net->ipv6.sysctl.frags.secret_interval = 10 * 60 * HZ; 729 net->ipv6.sysctl.flush_delay = 0; 730 net->ipv6.sysctl.ip6_rt_max_size = 4096; 731 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; 732 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; 733 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; 734 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; 735 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; 736 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; 737 net->ipv6.sysctl.icmpv6_time = 1*HZ; 738 ipv6_frag_sysctl_init(net); 739 740 return 0; 741} 742 743static void inet6_net_exit(struct net *net) 744{ 745 return; 746} 747 748static struct pernet_operations inet6_net_ops = { 749 .init = inet6_net_init, 750 .exit = inet6_net_exit, 751}; 752 753static int __init inet6_init(void) 754{ 755 struct sk_buff *dummy_skb; 756 struct list_head *r; 757 int err; 758 759 BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); 760 761#ifdef MODULE 762#if 0 /* FIXME --RR */ 763 if (!mod_member_present(&__this_module, can_unload)) 764 return -EINVAL; 765 766 __this_module.can_unload = &ipv6_unload; 767#endif 768#endif 769 err = proto_register(&tcpv6_prot, 1); 770 if (err) 771 goto out; 772 773 err = proto_register(&udpv6_prot, 1); 774 if (err) 775 goto out_unregister_tcp_proto; 776 777 err = proto_register(&udplitev6_prot, 1); 778 if (err) 779 goto out_unregister_udp_proto; 780 781 err = proto_register(&rawv6_prot, 1); 782 if (err) 783 goto out_unregister_udplite_proto; 784 785 786 /* Register the socket-side information for inet6_create. */ 787 for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) 788 INIT_LIST_HEAD(r); 789 790 /* We MUST register RAW sockets before we create the ICMP6, 791 * IGMP6, or NDISC control sockets. 792 */ 793 err = rawv6_init(); 794 if (err) 795 goto out_unregister_raw_proto; 796 797 /* Register the family here so that the init calls below will 798 * be able to create sockets. (?? is this dangerous ??) 799 */ 800 err = sock_register(&inet6_family_ops); 801 if (err) 802 goto out_sock_register_fail; 803 804 /* Initialise ipv6 mibs */ 805 err = init_ipv6_mibs(); 806 if (err) 807 goto out_unregister_sock; 808 809 /* 810 * ipngwg API draft makes clear that the correct semantics 811 * for TCP and UDP is to consider one TCP and UDP instance 812 * in a host availiable by both INET and INET6 APIs and 813 * able to communicate via both network protocols. 814 */ 815 816 err = register_pernet_subsys(&inet6_net_ops); 817 if (err) 818 goto register_pernet_fail; 819 820#ifdef CONFIG_SYSCTL 821 err = ipv6_sysctl_register(); 822 if (err) 823 goto sysctl_fail; 824#endif 825 err = icmpv6_init(&inet6_family_ops); 826 if (err) 827 goto icmp_fail; 828 err = ndisc_init(&inet6_family_ops); 829 if (err) 830 goto ndisc_fail; 831 err = igmp6_init(&inet6_family_ops); 832 if (err) 833 goto igmp_fail; 834 err = ipv6_netfilter_init(); 835 if (err) 836 goto netfilter_fail; 837 /* Create /proc/foo6 entries. */ 838#ifdef CONFIG_PROC_FS 839 err = -ENOMEM; 840 if (raw6_proc_init()) 841 goto proc_raw6_fail; 842 if (tcp6_proc_init()) 843 goto proc_tcp6_fail; 844 if (udp6_proc_init()) 845 goto proc_udp6_fail; 846 if (udplite6_proc_init()) 847 goto proc_udplite6_fail; 848 if (ipv6_misc_proc_init()) 849 goto proc_misc6_fail; 850 851 if (ac6_proc_init()) 852 goto proc_anycast6_fail; 853 if (if6_proc_init()) 854 goto proc_if6_fail; 855#endif 856 err = ip6_route_init(); 857 if (err) 858 goto ip6_route_fail; 859 err = ip6_flowlabel_init(); 860 if (err) 861 goto ip6_flowlabel_fail; 862 err = addrconf_init(); 863 if (err) 864 goto addrconf_fail; 865 866 /* Init v6 extension headers. */ 867 err = ipv6_exthdrs_init(); 868 if (err) 869 goto ipv6_exthdrs_fail; 870 871 err = ipv6_frag_init(); 872 if (err) 873 goto ipv6_frag_fail; 874 875 /* Init v6 transport protocols. */ 876 err = udpv6_init(); 877 if (err) 878 goto udpv6_fail; 879 880 err = udplitev6_init(); 881 if (err) 882 goto udplitev6_fail; 883 884 err = tcpv6_init(); 885 if (err) 886 goto tcpv6_fail; 887 888 err = ipv6_packet_init(); 889 if (err) 890 goto ipv6_packet_fail; 891out: 892 return err; 893 894ipv6_packet_fail: 895 tcpv6_exit(); 896tcpv6_fail: 897 udplitev6_exit(); 898udplitev6_fail: 899 udpv6_exit(); 900udpv6_fail: 901 ipv6_frag_exit(); 902ipv6_frag_fail: 903 ipv6_exthdrs_exit(); 904ipv6_exthdrs_fail: 905 addrconf_cleanup(); 906addrconf_fail: 907 ip6_flowlabel_cleanup(); 908ip6_flowlabel_fail: 909 ip6_route_cleanup(); 910ip6_route_fail: 911#ifdef CONFIG_PROC_FS 912 if6_proc_exit(); 913proc_if6_fail: 914 ac6_proc_exit(); 915proc_anycast6_fail: 916 ipv6_misc_proc_exit(); 917proc_misc6_fail: 918 udplite6_proc_exit(); 919proc_udplite6_fail: 920 udp6_proc_exit(); 921proc_udp6_fail: 922 tcp6_proc_exit(); 923proc_tcp6_fail: 924 raw6_proc_exit(); 925proc_raw6_fail: 926#endif 927 ipv6_netfilter_fini(); 928netfilter_fail: 929 igmp6_cleanup(); 930igmp_fail: 931 ndisc_cleanup(); 932ndisc_fail: 933 icmpv6_cleanup(); 934icmp_fail: 935#ifdef CONFIG_SYSCTL 936 ipv6_sysctl_unregister(); 937sysctl_fail: 938#endif 939 unregister_pernet_subsys(&inet6_net_ops); 940register_pernet_fail: 941 cleanup_ipv6_mibs(); 942out_unregister_sock: 943 sock_unregister(PF_INET6); 944 rtnl_unregister_all(PF_INET6); 945out_sock_register_fail: 946 rawv6_exit(); 947out_unregister_raw_proto: 948 proto_unregister(&rawv6_prot); 949out_unregister_udplite_proto: 950 proto_unregister(&udplitev6_prot); 951out_unregister_udp_proto: 952 proto_unregister(&udpv6_prot); 953out_unregister_tcp_proto: 954 proto_unregister(&tcpv6_prot); 955 goto out; 956} 957module_init(inet6_init); 958 959static void __exit inet6_exit(void) 960{ 961 /* First of all disallow new sockets creation. */ 962 sock_unregister(PF_INET6); 963 /* Disallow any further netlink messages */ 964 rtnl_unregister_all(PF_INET6); 965 966 udpv6_exit(); 967 udplitev6_exit(); 968 tcpv6_exit(); 969 970 /* Cleanup code parts. */ 971 ipv6_packet_cleanup(); 972 ipv6_frag_exit(); 973 ipv6_exthdrs_exit(); 974 addrconf_cleanup(); 975 ip6_flowlabel_cleanup(); 976 ip6_route_cleanup(); 977#ifdef CONFIG_PROC_FS 978 979 /* Cleanup code parts. */ 980 if6_proc_exit(); 981 ac6_proc_exit(); 982 ipv6_misc_proc_exit(); 983 udplite6_proc_exit(); 984 udp6_proc_exit(); 985 tcp6_proc_exit(); 986 raw6_proc_exit(); 987#endif 988 ipv6_netfilter_fini(); 989 igmp6_cleanup(); 990 ndisc_cleanup(); 991 icmpv6_cleanup(); 992 rawv6_exit(); 993#ifdef CONFIG_SYSCTL 994 ipv6_sysctl_unregister(); 995#endif 996 unregister_pernet_subsys(&inet6_net_ops); 997 cleanup_ipv6_mibs(); 998 proto_unregister(&rawv6_prot); 999 proto_unregister(&udplitev6_prot); 1000 proto_unregister(&udpv6_prot); 1001 proto_unregister(&tcpv6_prot); 1002} 1003module_exit(inet6_exit); 1004 1005MODULE_ALIAS_NETPROTO(PF_INET6); 1006