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