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
  48 #include <net/ip.h>
  49 #include <net/ipv6.h>
  50 #include <net/udp.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 /* IPv6 procfs goodies... */
  70
  71 #ifdef CONFIG_PROC_FS
  72 extern int raw6_proc_init(void);
  73 extern void raw6_proc_exit(void);
  74 extern int tcp6_proc_init(void);
  75 extern void tcp6_proc_exit(void);
  76 extern int udp6_proc_init(void);
  77 extern void udp6_proc_exit(void);
  78 extern int ipv6_misc_proc_init(void);
  79 extern void ipv6_misc_proc_exit(void);
  80 extern int ac6_proc_init(void);
  81 extern void ac6_proc_exit(void);
  82 extern int if6_proc_init(void);
  83 extern void if6_proc_exit(void);
  84 #endif
  85
  86 int sysctl_ipv6_bindv6only;
  87
  88 #ifdef INET_REFCNT_DEBUG
  89 atomic_t inet6_sock_nr;
  90 EXPORT_SYMBOL(inet6_sock_nr);
  91 #endif
  92
  93 /* The inetsw table contains everything that inet_create needs to
  94  * build a new socket.
  95  */
  96 static struct list_head inetsw6[SOCK_MAX];
  97 static DEFINE_SPINLOCK(inetsw6_lock);
  98
  99 static void inet6_sock_destruct(struct sock *sk)
 100 {
 101         inet_sock_destruct(sk);
 102
 103 #ifdef INET_REFCNT_DEBUG
 104         atomic_dec(&inet6_sock_nr);
 105 #endif
 106 }
 107
 108 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 109 {
 110         const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
 111
 112         return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 113 }
 114
 115 static int inet6_create(struct socket *sock, int protocol)
 116 {
 117         struct inet_sock *inet;
 118         struct ipv6_pinfo *np;
 119         struct sock *sk;
 120         struct list_head *p;
 121         struct inet_protosw *answer;
 122         struct proto *answer_prot;
 123         unsigned char answer_flags;
 124         char answer_no_check;
 125         int rc;
 126
 127         /* Look for the requested type/protocol pair. */
 128         answer = NULL;
 129         rcu_read_lock();
 130         list_for_each_rcu(p, &inetsw6[sock->type]) {
 131                 answer = list_entry(p, struct inet_protosw, list);
 132
 133                 /* Check the non-wild match. */
 134                 if (protocol == answer->protocol) {
 135                         if (protocol != IPPROTO_IP)
 136                                 break;
 137                 } else {
 138                         /* Check for the two wild cases. */
 139                         if (IPPROTO_IP == protocol) {
 140                                 protocol = answer->protocol;
 141                                 break;
 142                         }
 143                         if (IPPROTO_IP == answer->protocol)
 144                                 break;
 145                 }
 146                 answer = NULL;
 147         }
 148
 149         rc = -ESOCKTNOSUPPORT;
 150         if (!answer)
 151                 goto out_rcu_unlock;
 152         rc = -EPERM;
 153         if (answer->capability > 0 && !capable(answer->capability))
 154                 goto out_rcu_unlock;
 155         rc = -EPROTONOSUPPORT;
 156         if (!protocol)
 157                 goto out_rcu_unlock;
 158
 159         sock->ops = answer->ops;
 160
 161         answer_prot = answer->prot;
 162         answer_no_check = answer->no_check;
 163         answer_flags = answer->flags;
 164         rcu_read_unlock();
 165
 166         BUG_TRAP(answer_prot->slab != NULL);
 167
 168         rc = -ENOBUFS;
 169         sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
 170         if (sk == NULL)
 171                 goto out;
 172
 173         sock_init_data(sock, sk);
 174
 175         rc = 0;
 176         sk->sk_no_check = answer_no_check;
 177         if (INET_PROTOSW_REUSE & answer_flags)
 178                 sk->sk_reuse = 1;
 179
 180         inet = inet_sk(sk);
 181
 182         if (SOCK_RAW == sock->type) {
 183                 inet->num = protocol;
 184                 if (IPPROTO_RAW == protocol)
 185                         inet->hdrincl = 1;
 186         }
 187
 188         sk->sk_destruct         = inet6_sock_destruct;
 189         sk->sk_family           = PF_INET6;
 190         sk->sk_protocol         = protocol;
 191
 192         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 193
 194         inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 195         np->hop_limit   = -1;
 196         np->mcast_hops  = -1;
 197         np->mc_loop     = 1;
 198         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 199         np->ipv6only    = sysctl_ipv6_bindv6only;
 200
 201         /* Init the ipv4 part of the socket since we can have sockets
 202          * using v6 API for ipv4.
 203          */
 204         inet->uc_ttl    = -1;
 205
 206         inet->mc_loop   = 1;
 207         inet->mc_ttl    = 1;
 208         inet->mc_index  = 0;
 209         inet->mc_list   = NULL;
 210
 211         if (ipv4_config.no_pmtu_disc)
 212                 inet->pmtudisc = IP_PMTUDISC_DONT;
 213         else
 214                 inet->pmtudisc = IP_PMTUDISC_WANT;
 215
 216
 217 #ifdef INET_REFCNT_DEBUG
 218         atomic_inc(&inet6_sock_nr);
 219         atomic_inc(&inet_sock_nr);
 220 #endif
 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 = ntohs(inet->num);
 227                 sk->sk_prot->hash(sk);
 228         }
 229         if (sk->sk_prot->init) {
 230                 rc = sk->sk_prot->init(sk);
 231                 if (rc) {
 232                         sk_common_release(sk);
 233                         goto out;
 234                 }
 235         }
 236 out:
 237         return rc;
 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         __u32 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(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(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(&addr->sin6_addr, dev, 0)) {
 316                                         if (dev)
 317                                                 dev_put(dev);
 318                                         err = -EADDRNOTAVAIL;
 319                                         goto out;
 320                                 }
 321                         }
 322                         if (dev)
 323                                 dev_put(dev);
 324                 }
 325         }
 326
 327         inet->rcv_saddr = v4addr;
 328         inet->saddr = v4addr;
 329
 330         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 331
 332         if (!(addr_type & IPV6_ADDR_MULTICAST))
 333                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 334
 335         /* Make sure we are allowed to bind here. */
 336         if (sk->sk_prot->get_port(sk, snum)) {
 337                 inet_reset_saddr(sk);
 338                 err = -EADDRINUSE;
 339                 goto out;
 340         }
 341
 342         if (addr_type != IPV6_ADDR_ANY)
 343                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 344         if (snum)
 345                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 346         inet->sport = ntohs(inet->num);
 347         inet->dport = 0;
 348         inet->daddr = 0;
 349 out:
 350         release_sock(sk);
 351         return err;
 352 }
 353
 354 int inet6_release(struct socket *sock)
 355 {
 356         struct sock *sk = sock->sk;
 357
 358         if (sk == NULL)
 359                 return -EINVAL;
 360
 361         /* Free mc lists */
 362         ipv6_sock_mc_close(sk);
 363
 364         /* Free ac lists */
 365         ipv6_sock_ac_close(sk);
 366
 367         return inet_release(sock);
 368 }
 369
 370 int inet6_destroy_sock(struct sock *sk)
 371 {
 372         struct ipv6_pinfo *np = inet6_sk(sk);
 373         struct sk_buff *skb;
 374         struct ipv6_txoptions *opt;
 375
 376         /*
 377          *      Release destination entry
 378          */
 379
 380         sk_dst_reset(sk);
 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
 398 /*
 399  *      This does both peername and sockname.
 400  */
 401
 402 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 403                  int *uaddr_len, int peer)
 404 {
 405         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 406         struct sock *sk = sock->sk;
 407         struct inet_sock *inet = inet_sk(sk);
 408         struct ipv6_pinfo *np = inet6_sk(sk);
 409
 410         sin->sin6_family = AF_INET6;
 411         sin->sin6_flowinfo = 0;
 412         sin->sin6_scope_id = 0;
 413         if (peer) {
 414                 if (!inet->dport)
 415                         return -ENOTCONN;
 416                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 417                     peer == 1)
 418                         return -ENOTCONN;
 419                 sin->sin6_port = inet->dport;
 420                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 421                 if (np->sndflow)
 422                         sin->sin6_flowinfo = np->flow_label;
 423         } else {
 424                 if (ipv6_addr_any(&np->rcv_saddr))
 425                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 426                 else
 427                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 428
 429                 sin->sin6_port = inet->sport;
 430         }
 431         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 432                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 433         *uaddr_len = sizeof(*sin);
 434         return(0);
 435 }
 436
 437 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 438 {
 439         struct sock *sk = sock->sk;
 440         int err = -EINVAL;
 441
 442         switch(cmd)
 443         {
 444         case SIOCGSTAMP:
 445                 return sock_get_timestamp(sk, (struct timeval __user *)arg);
 446
 447         case SIOCADDRT:
 448         case SIOCDELRT:
 449
 450                 return(ipv6_route_ioctl(cmd,(void __user *)arg));
 451
 452         case SIOCSIFADDR:
 453                 return addrconf_add_ifaddr((void __user *) arg);
 454         case SIOCDIFADDR:
 455                 return addrconf_del_ifaddr((void __user *) arg);
 456         case SIOCSIFDSTADDR:
 457                 return addrconf_set_dstaddr((void __user *) arg);
 458         default:
 459                 if (!sk->sk_prot->ioctl ||
 460                     (err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD)
 461                         return(dev_ioctl(cmd,(void __user *) arg));
 462                 return err;
 463         }
 464         /*NOTREACHED*/
 465         return(0);
 466 }
 467
 468 struct proto_ops inet6_stream_ops = {
 469         .family =       PF_INET6,
 470         .owner =        THIS_MODULE,
 471         .release =      inet6_release,
 472         .bind =         inet6_bind,
 473         .connect =      inet_stream_connect,            /* ok           */
 474         .socketpair =   sock_no_socketpair,             /* a do nothing */
 475         .accept =       inet_accept,                    /* ok           */
 476         .getname =      inet6_getname,
 477         .poll =         tcp_poll,                       /* ok           */
 478         .ioctl =        inet6_ioctl,                    /* must change  */
 479         .listen =       inet_listen,                    /* ok           */
 480         .shutdown =     inet_shutdown,                  /* ok           */
 481         .setsockopt =   sock_common_setsockopt,         /* ok           */
 482         .getsockopt =   sock_common_getsockopt,         /* ok           */
 483         .sendmsg =      inet_sendmsg,                   /* ok           */
 484         .recvmsg =      sock_common_recvmsg,            /* ok           */
 485         .mmap =         sock_no_mmap,
 486         .sendpage =     tcp_sendpage
 487 };
 488
 489 struct proto_ops inet6_dgram_ops = {
 490         .family =       PF_INET6,
 491         .owner =        THIS_MODULE,
 492         .release =      inet6_release,
 493         .bind =         inet6_bind,
 494         .connect =      inet_dgram_connect,             /* ok           */
 495         .socketpair =   sock_no_socketpair,             /* a do nothing */
 496         .accept =       sock_no_accept,                 /* a do nothing */
 497         .getname =      inet6_getname,
 498         .poll =         udp_poll,                       /* ok           */
 499         .ioctl =        inet6_ioctl,                    /* must change  */
 500         .listen =       sock_no_listen,                 /* ok           */
 501         .shutdown =     inet_shutdown,                  /* ok           */
 502         .setsockopt =   sock_common_setsockopt,         /* ok           */
 503         .getsockopt =   sock_common_getsockopt,         /* ok           */
 504         .sendmsg =      inet_sendmsg,                   /* ok           */
 505         .recvmsg =      sock_common_recvmsg,            /* ok           */
 506         .mmap =         sock_no_mmap,
 507         .sendpage =     sock_no_sendpage,
 508 };
 509
 510 static struct net_proto_family inet6_family_ops = {
 511         .family = PF_INET6,
 512         .create = inet6_create,
 513         .owner  = THIS_MODULE,
 514 };
 515
 516 #ifdef CONFIG_SYSCTL
 517 extern void ipv6_sysctl_register(void);
 518 extern void ipv6_sysctl_unregister(void);
 519 #endif
 520
 521 /* Same as inet6_dgram_ops, sans udp_poll.  */
 522 static struct proto_ops inet6_sockraw_ops = {
 523         .family =       PF_INET6,
 524         .owner =        THIS_MODULE,
 525         .release =      inet6_release,
 526         .bind =         inet6_bind,
 527         .connect =      inet_dgram_connect,             /* ok           */
 528         .socketpair =   sock_no_socketpair,             /* a do nothing */
 529         .accept =       sock_no_accept,                 /* a do nothing */
 530         .getname =      inet6_getname,
 531         .poll =         datagram_poll,                  /* ok           */
 532         .ioctl =        inet6_ioctl,                    /* must change  */
 533         .listen =       sock_no_listen,                 /* ok           */
 534         .shutdown =     inet_shutdown,                  /* ok           */
 535         .setsockopt =   sock_common_setsockopt,         /* ok           */
 536         .getsockopt =   sock_common_getsockopt,         /* ok           */
 537         .sendmsg =      inet_sendmsg,                   /* ok           */
 538         .recvmsg =      sock_common_recvmsg,            /* ok           */
 539         .mmap =         sock_no_mmap,
 540         .sendpage =     sock_no_sendpage,
 541 };
 542
 543 static struct inet_protosw rawv6_protosw = {
 544         .type           = SOCK_RAW,
 545         .protocol       = IPPROTO_IP,   /* wild card */
 546         .prot           = &rawv6_prot,
 547         .ops            = &inet6_sockraw_ops,
 548         .capability     = CAP_NET_RAW,
 549         .no_check       = UDP_CSUM_DEFAULT,
 550         .flags          = INET_PROTOSW_REUSE,
 551 };
 552
 553 void
 554 inet6_register_protosw(struct inet_protosw *p)
 555 {
 556         struct list_head *lh;
 557         struct inet_protosw *answer;
 558         int protocol = p->protocol;
 559         struct list_head *last_perm;
 560
 561         spin_lock_bh(&inetsw6_lock);
 562
 563         if (p->type >= SOCK_MAX)
 564                 goto out_illegal;
 565
 566         /* If we are trying to override a permanent protocol, bail. */
 567         answer = NULL;
 568         last_perm = &inetsw6[p->type];
 569         list_for_each(lh, &inetsw6[p->type]) {
 570                 answer = list_entry(lh, struct inet_protosw, list);
 571
 572                 /* Check only the non-wild match. */
 573                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 574                         if (protocol == answer->protocol)
 575                                 break;
 576                         last_perm = lh;
 577                 }
 578
 579                 answer = NULL;
 580         }
 581         if (answer)
 582                 goto out_permanent;
 583
 584         /* Add the new entry after the last permanent entry if any, so that
 585          * the new entry does not override a permanent entry when matched with
 586          * a wild-card protocol. But it is allowed to override any existing
 587          * non-permanent entry.  This means that when we remove this entry, the
 588          * system automatically returns to the old behavior.
 589          */
 590         list_add_rcu(&p->list, last_perm);
 591 out:
 592         spin_unlock_bh(&inetsw6_lock);
 593         return;
 594
 595 out_permanent:
 596         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 597                protocol);
 598         goto out;
 599
 600 out_illegal:
 601         printk(KERN_ERR
 602                "Ignoring attempt to register invalid socket type %d.\n",
 603                p->type);
 604         goto out;
 605 }
 606
 607 void
 608 inet6_unregister_protosw(struct inet_protosw *p)
 609 {
 610         if (INET_PROTOSW_PERMANENT & p->flags) {
 611                 printk(KERN_ERR
 612                        "Attempt to unregister permanent protocol %d.\n",
 613                        p->protocol);
 614         } else {
 615                 spin_lock_bh(&inetsw6_lock);
 616                 list_del_rcu(&p->list);
 617                 spin_unlock_bh(&inetsw6_lock);
 618
 619                 synchronize_net();
 620         }
 621 }
 622
 623 int
 624 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
 625 {
 626         if (ptr == NULL)
 627                 return -EINVAL;
 628
 629         ptr[0] = __alloc_percpu(mibsize, mibalign);
 630         if (!ptr[0])
 631                 goto err0;
 632
 633         ptr[1] = __alloc_percpu(mibsize, mibalign);
 634         if (!ptr[1])
 635                 goto err1;
 636
 637         return 0;
 638
 639 err1:
 640         free_percpu(ptr[0]);
 641         ptr[0] = NULL;
 642 err0:
 643         return -ENOMEM;
 644 }
 645
 646 void
 647 snmp6_mib_free(void *ptr[2])
 648 {
 649         if (ptr == NULL)
 650                 return;
 651         if (ptr[0])
 652                 free_percpu(ptr[0]);
 653         if (ptr[1])
 654                 free_percpu(ptr[1]);
 655         ptr[0] = ptr[1] = NULL;
 656 }
 657
 658 static int __init init_ipv6_mibs(void)
 659 {
 660         if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 661                            __alignof__(struct ipstats_mib)) < 0)
 662                 goto err_ip_mib;
 663         if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 664                            __alignof__(struct icmpv6_mib)) < 0)
 665                 goto err_icmp_mib;
 666         if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 667                            __alignof__(struct udp_mib)) < 0)
 668                 goto err_udp_mib;
 669         return 0;
 670
 671 err_udp_mib:
 672         snmp6_mib_free((void **)icmpv6_statistics);
 673 err_icmp_mib:
 674         snmp6_mib_free((void **)ipv6_statistics);
 675 err_ip_mib:
 676         return -ENOMEM;
 677
 678 }
 679
 680 static void cleanup_ipv6_mibs(void)
 681 {
 682         snmp6_mib_free((void **)ipv6_statistics);
 683         snmp6_mib_free((void **)icmpv6_statistics);
 684         snmp6_mib_free((void **)udp_stats_in6);
 685 }
 686
 687 extern int ipv6_misc_proc_init(void);
 688
 689 static int __init inet6_init(void)
 690 {
 691         struct sk_buff *dummy_skb;
 692         struct list_head *r;
 693         int err;
 694
 695 #ifdef MODULE
 696 #if 0 /* FIXME --RR */
 697         if (!mod_member_present(&__this_module, can_unload))
 698           return -EINVAL;
 699
 700         __this_module.can_unload = &ipv6_unload;
 701 #endif
 702 #endif
 703
 704         if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
 705                 printk(KERN_CRIT "inet6_proto_init: size fault\n");
 706                 return -EINVAL;
 707         }
 708
 709         err = proto_register(&tcpv6_prot, 1);
 710         if (err)
 711                 goto out;
 712
 713         err = proto_register(&udpv6_prot, 1);
 714         if (err)
 715                 goto out_unregister_tcp_proto;
 716
 717         err = proto_register(&rawv6_prot, 1);
 718         if (err)
 719                 goto out_unregister_udp_proto;
 720
 721
 722         /* Register the socket-side information for inet6_create.  */
 723         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 724                 INIT_LIST_HEAD(r);
 725
 726         /* We MUST register RAW sockets before we create the ICMP6,
 727          * IGMP6, or NDISC control sockets.
 728          */
 729         inet6_register_protosw(&rawv6_protosw);
 730
 731         /* Register the family here so that the init calls below will
 732          * be able to create sockets. (?? is this dangerous ??)
 733          */
 734         (void) sock_register(&inet6_family_ops);
 735
 736         /* Initialise ipv6 mibs */
 737         err = init_ipv6_mibs();
 738         if (err)
 739                 goto out_unregister_raw_proto;
 740
 741         /*
 742          *      ipngwg API draft makes clear that the correct semantics
 743          *      for TCP and UDP is to consider one TCP and UDP instance
 744          *      in a host availiable by both INET and INET6 APIs and
 745          *      able to communicate via both network protocols.
 746          */
 747
 748 #ifdef CONFIG_SYSCTL
 749         ipv6_sysctl_register();
 750 #endif
 751         err = icmpv6_init(&inet6_family_ops);
 752         if (err)
 753                 goto icmp_fail;
 754         err = ndisc_init(&inet6_family_ops);
 755         if (err)
 756                 goto ndisc_fail;
 757         err = igmp6_init(&inet6_family_ops);
 758         if (err)
 759                 goto igmp_fail;
 760         /* Create /proc/foo6 entries. */
 761 #ifdef CONFIG_PROC_FS
 762         err = -ENOMEM;
 763         if (raw6_proc_init())
 764                 goto proc_raw6_fail;
 765         if (tcp6_proc_init())
 766                 goto proc_tcp6_fail;
 767         if (udp6_proc_init())
 768                 goto proc_udp6_fail;
 769         if (ipv6_misc_proc_init())
 770                 goto proc_misc6_fail;
 771
 772         if (ac6_proc_init())
 773                 goto proc_anycast6_fail;
 774         if (if6_proc_init())
 775                 goto proc_if6_fail;
 776 #endif
 777         ipv6_packet_init();
 778         ip6_route_init();
 779         ip6_flowlabel_init();
 780         err = addrconf_init();
 781         if (err)
 782                 goto addrconf_fail;
 783         sit_init();
 784
 785         /* Init v6 extension headers. */
 786         ipv6_rthdr_init();
 787         ipv6_frag_init();
 788         ipv6_nodata_init();
 789         ipv6_destopt_init();
 790
 791         /* Init v6 transport protocols. */
 792         udpv6_init();
 793         tcpv6_init();
 794         err = 0;
 795 out:
 796         return err;
 797
 798 addrconf_fail:
 799         ip6_flowlabel_cleanup();
 800         ip6_route_cleanup();
 801         ipv6_packet_cleanup();
 802 #ifdef CONFIG_PROC_FS
 803         if6_proc_exit();
 804 proc_if6_fail:
 805         ac6_proc_exit();
 806 proc_anycast6_fail:
 807         ipv6_misc_proc_exit();
 808 proc_misc6_fail:
 809         udp6_proc_exit();
 810 proc_udp6_fail:
 811         tcp6_proc_exit();
 812 proc_tcp6_fail:
 813         raw6_proc_exit();
 814 proc_raw6_fail:
 815 #endif
 816         igmp6_cleanup();
 817 igmp_fail:
 818         ndisc_cleanup();
 819 ndisc_fail:
 820         icmpv6_cleanup();
 821 icmp_fail:
 822 #ifdef CONFIG_SYSCTL
 823         ipv6_sysctl_unregister();
 824 #endif
 825         cleanup_ipv6_mibs();
 826 out_unregister_raw_proto:
 827         proto_unregister(&rawv6_prot);
 828 out_unregister_udp_proto:
 829         proto_unregister(&udpv6_prot);
 830 out_unregister_tcp_proto:
 831         proto_unregister(&tcpv6_prot);
 832         goto out;
 833 }
 834 module_init(inet6_init);
 835
 836 static void __exit inet6_exit(void)
 837 {
 838         /* First of all disallow new sockets creation. */
 839         sock_unregister(PF_INET6);
 840 #ifdef CONFIG_PROC_FS
 841         if6_proc_exit();
 842         ac6_proc_exit();
 843         ipv6_misc_proc_exit();
 844         udp6_proc_exit();
 845         tcp6_proc_exit();
 846         raw6_proc_exit();
 847 #endif
 848         /* Cleanup code parts. */
 849         sit_cleanup();
 850         ip6_flowlabel_cleanup();
 851         addrconf_cleanup();
 852         ip6_route_cleanup();
 853         ipv6_packet_cleanup();
 854         igmp6_cleanup();
 855         ndisc_cleanup();
 856         icmpv6_cleanup();
 857 #ifdef CONFIG_SYSCTL
 858         ipv6_sysctl_unregister();
 859 #endif
 860         cleanup_ipv6_mibs();
 861         proto_unregister(&rawv6_prot);
 862         proto_unregister(&udpv6_prot);
 863         proto_unregister(&tcpv6_prot);
 864 }
 865 module_exit(inet6_exit);
 866
 867 MODULE_ALIAS_NETPROTO(PF_INET6);