net/ipv6/af_inet6.c

   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/config.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/sched.h>
  32 #include <linux/timer.h>
  33 #include <linux/string.h>
  34 #include <linux/sockios.h>
  35 #include <linux/net.h>
  36 #include <linux/fcntl.h>
  37 #include <linux/mm.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/stat.h>
  41 #include <linux/init.h>
  42
  43 #include <linux/inet.h>
  44 #include <linux/netdevice.h>
  45 #include <linux/icmpv6.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/netfilter_ipv6.h>
  48
  49 #include <net/ip.h>
  50 #include <net/ipv6.h>
  51 #include <net/udp.h>
  52 #include <net/tcp.h>
  53 #include <net/ipip.h>
  54 #include <net/protocol.h>
  55 #include <net/inet_common.h>
  56 #include <net/transp_v6.h>
  57 #include <net/ip6_route.h>
  58 #include <net/addrconf.h>
  59 #ifdef CONFIG_IPV6_TUNNEL
  60 #include <net/ip6_tunnel.h>
  61 #endif
  62
  63 #include <asm/uaccess.h>
  64 #include <asm/system.h>
  65
  66 MODULE_AUTHOR("Cast of dozens");
  67 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  68 MODULE_LICENSE("GPL");
  69
  70 int sysctl_ipv6_bindv6only;
  71
  72 /* The inetsw table contains everything that inet_create needs to
  73  * build a new socket.
  74  */
  75 static struct list_head inetsw6[SOCK_MAX];
  76 static DEFINE_SPINLOCK(inetsw6_lock);
  77
  78 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
  79 {
  80         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
  81
  82         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
  83 }
  84
  85 static int inet6_create(struct socket *sock, int protocol)
  86 {
  87         struct inet_sock *inet;
  88         struct ipv6_pinfo *np;
  89         struct sock *sk;
  90         struct list_head *p;
  91         struct inet_protosw *answer;
  92         struct proto *answer_prot;
  93         unsigned char answer_flags;
  94         char answer_no_check;
  95         int rc;
  96
  97         /* Look for the requested type/protocol pair. */
  98         answer = NULL;
  99         rcu_read_lock();
 100         list_for_each_rcu(p, &inetsw6[sock->type]) {
 101                 answer = list_entry(p, struct inet_protosw, list);
 102
 103                 /* Check the non-wild match. */
 104                 if (protocol == answer->protocol) {
 105                         if (protocol != IPPROTO_IP)
 106                                 break;
 107                 } else {
 108                         /* Check for the two wild cases. */
 109                         if (IPPROTO_IP == protocol) {
 110                                 protocol = answer->protocol;
 111                                 break;
 112                         }
 113                         if (IPPROTO_IP == answer->protocol)
 114                                 break;
 115                 }
 116                 answer = NULL;
 117         }
 118
 119         rc = -ESOCKTNOSUPPORT;
 120         if (!answer)
 121                 goto out_rcu_unlock;
 122         rc = -EPERM;
 123         if (answer->capability > 0 && !capable(answer->capability))
 124                 goto out_rcu_unlock;
 125         rc = -EPROTONOSUPPORT;
 126         if (!protocol)
 127                 goto out_rcu_unlock;
 128
 129         sock->ops = answer->ops;
 130
 131         answer_prot = answer->prot;
 132         answer_no_check = answer->no_check;
 133         answer_flags = answer->flags;
 134         rcu_read_unlock();
 135
 136         BUG_TRAP(answer_prot->slab != NULL);
 137
 138         rc = -ENOBUFS;
 139         sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
 140         if (sk == NULL)
 141                 goto out;
 142
 143         sock_init_data(sock, sk);
 144
 145         rc = 0;
 146         sk->sk_no_check = answer_no_check;
 147         if (INET_PROTOSW_REUSE & answer_flags)
 148                 sk->sk_reuse = 1;
 149
 150         inet = inet_sk(sk);
 151
 152         if (SOCK_RAW == sock->type) {
 153                 inet->num = protocol;
 154                 if (IPPROTO_RAW == protocol)
 155                         inet->hdrincl = 1;
 156         }
 157
 158         sk->sk_destruct         = inet_sock_destruct;
 159         sk->sk_family           = PF_INET6;
 160         sk->sk_protocol         = protocol;
 161
 162         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 163
 164         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 165         np->hop_limit   = -1;
 166         np->mcast_hops  = -1;
 167         np->mc_loop     = 1;
 168         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 169         np->ipv6only    = sysctl_ipv6_bindv6only;
 170
 171         /* Init the ipv4 part of the socket since we can have sockets
 172          * using v6 API for ipv4.
 173          */
 174         inet->uc_ttl    = -1;
 175
 176         inet->mc_loop   = 1;
 177         inet->mc_ttl    = 1;
 178         inet->mc_index  = 0;
 179         inet->mc_list   = NULL;
 180
 181         if (ipv4_config.no_pmtu_disc)
 182                 inet->pmtudisc = IP_PMTUDISC_DONT;
 183         else
 184                 inet->pmtudisc = IP_PMTUDISC_WANT;
 185         /*
 186          * Increment only the relevant sk_prot->socks debug field, this changes
 187          * the previous behaviour of incrementing both the equivalent to
 188          * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
 189          *
 190          * This allows better debug granularity as we'll know exactly how many
 191          * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
 192          * transport protocol socks. -acme
 193          */
 194         sk_refcnt_debug_inc(sk);
 195
 196         if (inet->num) {
 197                 /* It assumes that any protocol which allows
 198                  * the user to assign a number at socket
 199                  * creation time automatically shares.
 200                  */
 201                 inet->sport = ntohs(inet->num);
 202                 sk->sk_prot->hash(sk);
 203         }
 204         if (sk->sk_prot->init) {
 205                 rc = sk->sk_prot->init(sk);
 206                 if (rc) {
 207                         sk_common_release(sk);
 208                         goto out;
 209                 }
 210         }
 211 out:
 212         return rc;
 213 out_rcu_unlock:
 214         rcu_read_unlock();
 215         goto out;
 216 }
 217
 218
 219 /* bind for INET6 API */
 220 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 221 {
 222         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 223         struct sock *sk = sock->sk;
 224         struct inet_sock *inet = inet_sk(sk);
 225         struct ipv6_pinfo *np = inet6_sk(sk);
 226         __u32 v4addr = 0;
 227         unsigned short snum;
 228         int addr_type = 0;
 229         int err = 0;
 230
 231         /* If the socket has its own bind function then use it. */
 232         if (sk->sk_prot->bind)
 233                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 234
 235         if (addr_len < SIN6_LEN_RFC2133)
 236                 return -EINVAL;
 237         addr_type = ipv6_addr_type(&addr->sin6_addr);
 238         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 239                 return -EINVAL;
 240
 241         snum = ntohs(addr->sin6_port);
 242         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 243                 return -EACCES;
 244
 245         lock_sock(sk);
 246
 247         /* Check these errors (active socket, double bind). */
 248         if (sk->sk_state != TCP_CLOSE || inet->num) {
 249                 err = -EINVAL;
 250                 goto out;
 251         }
 252
 253         /* Check if the address belongs to the host. */
 254         if (addr_type == IPV6_ADDR_MAPPED) {
 255                 v4addr = addr->sin6_addr.s6_addr32[3];
 256                 if (inet_addr_type(v4addr) != RTN_LOCAL) {
 257                         err = -EADDRNOTAVAIL;
 258                         goto out;
 259                 }
 260         } else {
 261                 if (addr_type != IPV6_ADDR_ANY) {
 262                         struct net_device *dev = NULL;
 263
 264                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 265                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 266                                     addr->sin6_scope_id) {
 267                                         /* Override any existing binding, if another one
 268                                          * is supplied by user.
 269                                          */
 270                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 271                                 }
 272
 273                                 /* Binding to link-local address requires an interface */
 274                                 if (!sk->sk_bound_dev_if) {
 275                                         err = -EINVAL;
 276                                         goto out;
 277                                 }
 278                                 dev = dev_get_by_index(sk->sk_bound_dev_if);
 279                                 if (!dev) {
 280                                         err = -ENODEV;
 281                                         goto out;
 282                                 }
 283                         }
 284
 285                         /* ipv4 addr of the socket is invalid.  Only the
 286                          * unspecified and mapped address have a v4 equivalent.
 287                          */
 288                         v4addr = LOOPBACK4_IPV6;
 289                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 290                                 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
 291                                         if (dev)
 292                                                 dev_put(dev);
 293                                         err = -EADDRNOTAVAIL;
 294                                         goto out;
 295                                 }
 296                         }
 297                         if (dev)
 298                                 dev_put(dev);
 299                 }
 300         }
 301
 302         inet->rcv_saddr = v4addr;
 303         inet->saddr = v4addr;
 304
 305         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 306
 307         if (!(addr_type & IPV6_ADDR_MULTICAST))
 308                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 309
 310         /* Make sure we are allowed to bind here. */
 311         if (sk->sk_prot->get_port(sk, snum)) {
 312                 inet_reset_saddr(sk);
 313                 err = -EADDRINUSE;
 314                 goto out;
 315         }
 316
 317         if (addr_type != IPV6_ADDR_ANY)
 318                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 319         if (snum)
 320                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 321         inet->sport = ntohs(inet->num);
 322         inet->dport = 0;
 323         inet->daddr = 0;
 324 out:
 325         release_sock(sk);
 326         return err;
 327 }
 328
 329 int inet6_release(struct socket *sock)
 330 {
 331         struct sock *sk = sock->sk;
 332
 333         if (sk == NULL)
 334                 return -EINVAL;
 335
 336         /* Free mc lists */
 337         ipv6_sock_mc_close(sk);
 338
 339         /* Free ac lists */
 340         ipv6_sock_ac_close(sk);
 341
 342         return inet_release(sock);
 343 }
 344
 345 int inet6_destroy_sock(struct sock *sk)
 346 {
 347         struct ipv6_pinfo *np = inet6_sk(sk);
 348         struct sk_buff *skb;
 349         struct ipv6_txoptions *opt;
 350
 351         /*
 352          *      Release destination entry
 353          */
 354
 355         sk_dst_reset(sk);
 356
 357         /* Release rx options */
 358
 359         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 360                 kfree_skb(skb);
 361
 362         /* Free flowlabels */
 363         fl6_free_socklist(sk);
 364
 365         /* Free tx options */
 366
 367         if ((opt = xchg(&np->opt, NULL)) != NULL)
 368                 sock_kfree_s(sk, opt, opt->tot_len);
 369
 370         return 0;
 371 }
 372
 373 /*
 374  *      This does both peername and sockname.
 375  */
 376
 377 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 378                  int *uaddr_len, int peer)
 379 {
 380         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 381         struct sock *sk = sock->sk;
 382         struct inet_sock *inet = inet_sk(sk);
 383         struct ipv6_pinfo *np = inet6_sk(sk);
 384
 385         sin->sin6_family = AF_INET6;
 386         sin->sin6_flowinfo = 0;
 387         sin->sin6_scope_id = 0;
 388         if (peer) {
 389                 if (!inet->dport)
 390                         return -ENOTCONN;
 391                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 392                     peer == 1)
 393                         return -ENOTCONN;
 394                 sin->sin6_port = inet->dport;
 395                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 396                 if (np->sndflow)
 397                         sin->sin6_flowinfo = np->flow_label;
 398         } else {
 399                 if (ipv6_addr_any(&np->rcv_saddr))
 400                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 401                 else
 402                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 403
 404                 sin->sin6_port = inet->sport;
 405         }
 406         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 407                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 408         *uaddr_len = sizeof(*sin);
 409         return(0);
 410 }
 411
 412 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 413 {
 414         struct sock *sk = sock->sk;
 415         int err = -EINVAL;
 416
 417         switch(cmd)
 418         {
 419         case SIOCGSTAMP:
 420                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 421
 422         case SIOCADDRT:
 423         case SIOCDELRT:
 424
 425                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
 426
 427         case SIOCSIFADDR:
 428                 return addrconf_add_ifaddr((void __user *) arg);
 429         case SIOCDIFADDR:
 430                 return addrconf_del_ifaddr((void __user *) arg);
 431         case SIOCSIFDSTADDR:
 432                 return addrconf_set_dstaddr((void __user *) arg);
 433         default:
 434                 if (!sk->sk_prot->ioctl ||
 435                     (err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD)
 436                         return(dev_ioctl(cmd,(void __user *) arg));
 437                 return err;
 438         }
 439         /*NOTREACHED*/
 440         return(0);
 441 }
 442
 443 struct proto_ops inet6_stream_ops = {
 444         .family =       PF_INET6,
 445         .owner =        THIS_MODULE,
 446         .release =      inet6_release,
 447         .bind =         inet6_bind,
 448         .connect =      inet_stream_connect,            /* ok           */
 449         .socketpair =   sock_no_socketpair,             /* a do nothing */
 450         .accept =       inet_accept,                    /* ok           */
 451         .getname =      inet6_getname,
 452         .poll =         tcp_poll,                       /* ok           */
 453         .ioctl =        inet6_ioctl,                    /* must change  */
 454         .listen =       inet_listen,                    /* ok           */
 455         .shutdown =     inet_shutdown,                  /* ok           */
 456         .setsockopt =   sock_common_setsockopt,         /* ok           */
 457         .getsockopt =   sock_common_getsockopt,         /* ok           */
 458         .sendmsg =      inet_sendmsg,                   /* ok           */
 459         .recvmsg =      sock_common_recvmsg,            /* ok           */
 460         .mmap =         sock_no_mmap,
 461         .sendpage =     tcp_sendpage
 462 };
 463
 464 struct proto_ops inet6_dgram_ops = {
 465         .family =       PF_INET6,
 466         .owner =        THIS_MODULE,
 467         .release =      inet6_release,
 468         .bind =         inet6_bind,
 469         .connect =      inet_dgram_connect,             /* ok           */
 470         .socketpair =   sock_no_socketpair,             /* a do nothing */
 471         .accept =       sock_no_accept,                 /* a do nothing */
 472         .getname =      inet6_getname,
 473         .poll =         udp_poll,                       /* ok           */
 474         .ioctl =        inet6_ioctl,                    /* must change  */
 475         .listen =       sock_no_listen,                 /* ok           */
 476         .shutdown =     inet_shutdown,                  /* ok           */
 477         .setsockopt =   sock_common_setsockopt,         /* ok           */
 478         .getsockopt =   sock_common_getsockopt,         /* ok           */
 479         .sendmsg =      inet_sendmsg,                   /* ok           */
 480         .recvmsg =      sock_common_recvmsg,            /* ok           */
 481         .mmap =         sock_no_mmap,
 482         .sendpage =     sock_no_sendpage,
 483 };
 484
 485 static struct net_proto_family inet6_family_ops = {
 486         .family = PF_INET6,
 487         .create = inet6_create,
 488         .owner  = THIS_MODULE,
 489 };
 490
 491 /* Same as inet6_dgram_ops, sans udp_poll.  */
 492 static struct proto_ops inet6_sockraw_ops = {
 493         .family =       PF_INET6,
 494         .owner =        THIS_MODULE,
 495         .release =      inet6_release,
 496         .bind =         inet6_bind,
 497         .connect =      inet_dgram_connect,             /* ok           */
 498         .socketpair =   sock_no_socketpair,             /* a do nothing */
 499         .accept =       sock_no_accept,                 /* a do nothing */
 500         .getname =      inet6_getname,
 501         .poll =         datagram_poll,                  /* ok           */
 502         .ioctl =        inet6_ioctl,                    /* must change  */
 503         .listen =       sock_no_listen,                 /* ok           */
 504         .shutdown =     inet_shutdown,                  /* ok           */
 505         .setsockopt =   sock_common_setsockopt,         /* ok           */
 506         .getsockopt =   sock_common_getsockopt,         /* ok           */
 507         .sendmsg =      inet_sendmsg,                   /* ok           */
 508         .recvmsg =      sock_common_recvmsg,            /* ok           */
 509         .mmap =         sock_no_mmap,
 510         .sendpage =     sock_no_sendpage,
 511 };
 512
 513 static struct inet_protosw rawv6_protosw = {
 514         .type           = SOCK_RAW,
 515         .protocol       = IPPROTO_IP,   /* wild card */
 516         .prot           = &rawv6_prot,
 517         .ops            = &inet6_sockraw_ops,
 518         .capability     = CAP_NET_RAW,
 519         .no_check       = UDP_CSUM_DEFAULT,
 520         .flags          = INET_PROTOSW_REUSE,
 521 };
 522
 523 void
 524 inet6_register_protosw(struct inet_protosw *p)
 525 {
 526         struct list_head *lh;
 527         struct inet_protosw *answer;
 528         int protocol = p->protocol;
 529         struct list_head *last_perm;
 530
 531         spin_lock_bh(&inetsw6_lock);
 532
 533         if (p->type >= SOCK_MAX)
 534                 goto out_illegal;
 535
 536         /* If we are trying to override a permanent protocol, bail. */
 537         answer = NULL;
 538         last_perm = &inetsw6[p->type];
 539         list_for_each(lh, &inetsw6[p->type]) {
 540                 answer = list_entry(lh, struct inet_protosw, list);
 541
 542                 /* Check only the non-wild match. */
 543                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 544                         if (protocol == answer->protocol)
 545                                 break;
 546                         last_perm = lh;
 547                 }
 548
 549                 answer = NULL;
 550         }
 551         if (answer)
 552                 goto out_permanent;
 553
 554         /* Add the new entry after the last permanent entry if any, so that
 555          * the new entry does not override a permanent entry when matched with
 556          * a wild-card protocol. But it is allowed to override any existing
 557          * non-permanent entry.  This means that when we remove this entry, the
 558          * system automatically returns to the old behavior.
 559          */
 560         list_add_rcu(&p->list, last_perm);
 561 out:
 562         spin_unlock_bh(&inetsw6_lock);
 563         return;
 564
 565 out_permanent:
 566         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 567                protocol);
 568         goto out;
 569
 570 out_illegal:
 571         printk(KERN_ERR
 572                "Ignoring attempt to register invalid socket type %d.\n",
 573                p->type);
 574         goto out;
 575 }
 576
 577 void
 578 inet6_unregister_protosw(struct inet_protosw *p)
 579 {
 580         if (INET_PROTOSW_PERMANENT & p->flags) {
 581                 printk(KERN_ERR
 582                        "Attempt to unregister permanent protocol %d.\n",
 583                        p->protocol);
 584         } else {
 585                 spin_lock_bh(&inetsw6_lock);
 586                 list_del_rcu(&p->list);
 587                 spin_unlock_bh(&inetsw6_lock);
 588
 589                 synchronize_net();
 590         }
 591 }
 592
 593 int
 594 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
 595 {
 596         if (ptr == NULL)
 597                 return -EINVAL;
 598
 599         ptr[0] = __alloc_percpu(mibsize, mibalign);
 600         if (!ptr[0])
 601                 goto err0;
 602
 603         ptr[1] = __alloc_percpu(mibsize, mibalign);
 604         if (!ptr[1])
 605                 goto err1;
 606
 607         return 0;
 608
 609 err1:
 610         free_percpu(ptr[0]);
 611         ptr[0] = NULL;
 612 err0:
 613         return -ENOMEM;
 614 }
 615
 616 void
 617 snmp6_mib_free(void *ptr[2])
 618 {
 619         if (ptr == NULL)
 620                 return;
 621         if (ptr[0])
 622                 free_percpu(ptr[0]);
 623         if (ptr[1])
 624                 free_percpu(ptr[1]);
 625         ptr[0] = ptr[1] = NULL;
 626 }
 627
 628 static int __init init_ipv6_mibs(void)
 629 {
 630         if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 631                            __alignof__(struct ipstats_mib)) < 0)
 632                 goto err_ip_mib;
 633         if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 634                            __alignof__(struct icmpv6_mib)) < 0)
 635                 goto err_icmp_mib;
 636         if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 637                            __alignof__(struct udp_mib)) < 0)
 638                 goto err_udp_mib;
 639         return 0;
 640
 641 err_udp_mib:
 642         snmp6_mib_free((void **)icmpv6_statistics);
 643 err_icmp_mib:
 644         snmp6_mib_free((void **)ipv6_statistics);
 645 err_ip_mib:
 646         return -ENOMEM;
 647
 648 }
 649
 650 static void cleanup_ipv6_mibs(void)
 651 {
 652         snmp6_mib_free((void **)ipv6_statistics);
 653         snmp6_mib_free((void **)icmpv6_statistics);
 654         snmp6_mib_free((void **)udp_stats_in6);
 655 }
 656
 657 static int __init inet6_init(void)
 658 {
 659         struct sk_buff *dummy_skb;
 660         struct list_head *r;
 661         int err;
 662
 663 #ifdef MODULE
 664 #if 0 /* FIXME --RR */
 665         if (!mod_member_present(&__this_module, can_unload))
 666           return -EINVAL;
 667
 668         __this_module.can_unload = &ipv6_unload;
 669 #endif
 670 #endif
 671
 672         if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
 673                 printk(KERN_CRIT "inet6_proto_init: size fault\n");
 674                 return -EINVAL;
 675         }
 676
 677         err = proto_register(&tcpv6_prot, 1);
 678         if (err)
 679                 goto out;
 680
 681         err = proto_register(&udpv6_prot, 1);
 682         if (err)
 683                 goto out_unregister_tcp_proto;
 684
 685         err = proto_register(&rawv6_prot, 1);
 686         if (err)
 687                 goto out_unregister_udp_proto;
 688
 689
 690         /* Register the socket-side information for inet6_create.  */
 691         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 692                 INIT_LIST_HEAD(r);
 693
 694         /* We MUST register RAW sockets before we create the ICMP6,
 695          * IGMP6, or NDISC control sockets.
 696          */
 697         inet6_register_protosw(&rawv6_protosw);
 698
 699         /* Register the family here so that the init calls below will
 700          * be able to create sockets. (?? is this dangerous ??)
 701          */
 702         (void) sock_register(&inet6_family_ops);
 703
 704         /* Initialise ipv6 mibs */
 705         err = init_ipv6_mibs();
 706         if (err)
 707                 goto out_unregister_raw_proto;
 708
 709         /*
 710          *      ipngwg API draft makes clear that the correct semantics
 711          *      for TCP and UDP is to consider one TCP and UDP instance
 712          *      in a host availiable by both INET and INET6 APIs and
 713          *      able to communicate via both network protocols.
 714          */
 715
 716 #ifdef CONFIG_SYSCTL
 717         ipv6_sysctl_register();
 718 #endif
 719         err = icmpv6_init(&inet6_family_ops);
 720         if (err)
 721                 goto icmp_fail;
 722         err = ndisc_init(&inet6_family_ops);
 723         if (err)
 724                 goto ndisc_fail;
 725         err = igmp6_init(&inet6_family_ops);
 726         if (err)
 727                 goto igmp_fail;
 728         err = ipv6_netfilter_init();
 729         if (err)
 730                 goto netfilter_fail;
 731         /* Create /proc/foo6 entries. */
 732 #ifdef CONFIG_PROC_FS
 733         err = -ENOMEM;
 734         if (raw6_proc_init())
 735                 goto proc_raw6_fail;
 736         if (tcp6_proc_init())
 737                 goto proc_tcp6_fail;
 738         if (udp6_proc_init())
 739                 goto proc_udp6_fail;
 740         if (ipv6_misc_proc_init())
 741                 goto proc_misc6_fail;
 742
 743         if (ac6_proc_init())
 744                 goto proc_anycast6_fail;
 745         if (if6_proc_init())
 746                 goto proc_if6_fail;
 747 #endif
 748         ip6_route_init();
 749         ip6_flowlabel_init();
 750         err = addrconf_init();
 751         if (err)
 752                 goto addrconf_fail;
 753         sit_init();
 754
 755         /* Init v6 extension headers. */
 756         ipv6_rthdr_init();
 757         ipv6_frag_init();
 758         ipv6_nodata_init();
 759         ipv6_destopt_init();
 760
 761         /* Init v6 transport protocols. */
 762         udpv6_init();
 763         tcpv6_init();
 764
 765         ipv6_packet_init();
 766         err = 0;
 767 out:
 768         return err;
 769
 770 addrconf_fail:
 771         ip6_flowlabel_cleanup();
 772         ip6_route_cleanup();
 773 #ifdef CONFIG_PROC_FS
 774         if6_proc_exit();
 775 proc_if6_fail:
 776         ac6_proc_exit();
 777 proc_anycast6_fail:
 778         ipv6_misc_proc_exit();
 779 proc_misc6_fail:
 780         udp6_proc_exit();
 781 proc_udp6_fail:
 782         tcp6_proc_exit();
 783 proc_tcp6_fail:
 784         raw6_proc_exit();
 785 proc_raw6_fail:
 786 #endif
 787         ipv6_netfilter_fini();
 788 netfilter_fail:
 789         igmp6_cleanup();
 790 igmp_fail:
 791         ndisc_cleanup();
 792 ndisc_fail:
 793         icmpv6_cleanup();
 794 icmp_fail:
 795 #ifdef CONFIG_SYSCTL
 796         ipv6_sysctl_unregister();
 797 #endif
 798         cleanup_ipv6_mibs();
 799 out_unregister_raw_proto:
 800         proto_unregister(&rawv6_prot);
 801 out_unregister_udp_proto:
 802         proto_unregister(&udpv6_prot);
 803 out_unregister_tcp_proto:
 804         proto_unregister(&tcpv6_prot);
 805         goto out;
 806 }
 807 module_init(inet6_init);
 808
 809 static void __exit inet6_exit(void)
 810 {
 811         /* First of all disallow new sockets creation. */
 812         sock_unregister(PF_INET6);
 813 #ifdef CONFIG_PROC_FS
 814         if6_proc_exit();
 815         ac6_proc_exit();
 816         ipv6_misc_proc_exit();
 817         udp6_proc_exit();
 818         tcp6_proc_exit();
 819         raw6_proc_exit();
 820 #endif
 821         /* Cleanup code parts. */
 822         sit_cleanup();
 823         ip6_flowlabel_cleanup();
 824         addrconf_cleanup();
 825         ip6_route_cleanup();
 826         ipv6_packet_cleanup();
 827         igmp6_cleanup();
 828         ipv6_netfilter_fini();
 829         ndisc_cleanup();
 830         icmpv6_cleanup();
 831 #ifdef CONFIG_SYSCTL
 832         ipv6_sysctl_unregister();
 833 #endif
 834         cleanup_ipv6_mibs();
 835         proto_unregister(&rawv6_prot);
 836         proto_unregister(&udpv6_prot);
 837         proto_unregister(&tcpv6_prot);
 838 }
 839 module_exit(inet6_exit);
 840
 841 MODULE_ALIAS_NETPROTO(PF_INET6);