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/major.h>
  32 #include <linux/sched.h>
  33 #include <linux/timer.h>
  34 #include <linux/string.h>
  35 #include <linux/sockios.h>
  36 #include <linux/net.h>
  37 #include <linux/fcntl.h>
  38 #include <linux/mm.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/stat.h>
  42 #include <linux/init.h>
  43
  44 #include <linux/inet.h>
  45 #include <linux/netdevice.h>
  46 #include <linux/icmpv6.h>
  47 #include <linux/smp_lock.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 /* IPv6 procfs goodies... */
  71
  72 #ifdef CONFIG_PROC_FS
  73 extern int raw6_proc_init(void);
  74 extern void raw6_proc_exit(void);
  75 extern int tcp6_proc_init(void);
  76 extern void tcp6_proc_exit(void);
  77 extern int udp6_proc_init(void);
  78 extern void udp6_proc_exit(void);
  79 extern int ipv6_misc_proc_init(void);
  80 extern void ipv6_misc_proc_exit(void);
  81 extern int ac6_proc_init(void);
  82 extern void ac6_proc_exit(void);
  83 extern int if6_proc_init(void);
  84 extern void if6_proc_exit(void);
  85 #endif
  86
  87 int sysctl_ipv6_bindv6only;
  88
  89 #ifdef INET_REFCNT_DEBUG
  90 atomic_t 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 spinlock_t inetsw6_lock = SPIN_LOCK_UNLOCKED;
  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->slab_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_opt *inet;
 118         struct ipv6_pinfo *np;
 119         struct sock *sk;
 120         struct tcp6_sock* tcp6sk;
 121         struct list_head *p;
 122         struct inet_protosw *answer;
 123         struct proto *answer_prot;
 124         unsigned char answer_flags;
 125         char answer_no_check;
 126         int rc;
 127
 128         /* Look for the requested type/protocol pair. */
 129         answer = NULL;
 130         rcu_read_lock();
 131         list_for_each_rcu(p, &inetsw6[sock->type]) {
 132                 answer = list_entry(p, struct inet_protosw, list);
 133
 134                 /* Check the non-wild match. */
 135                 if (protocol == answer->protocol) {
 136                         if (protocol != IPPROTO_IP)
 137                                 break;
 138                 } else {
 139                         /* Check for the two wild cases. */
 140                         if (IPPROTO_IP == protocol) {
 141                                 protocol = answer->protocol;
 142                                 break;
 143                         }
 144                         if (IPPROTO_IP == answer->protocol)
 145                                 break;
 146                 }
 147                 answer = NULL;
 148         }
 149
 150         rc = -ESOCKTNOSUPPORT;
 151         if (!answer)
 152                 goto out_rcu_unlock;
 153         rc = -EPERM;
 154         if (answer->capability > 0 && !capable(answer->capability))
 155                 goto out_rcu_unlock;
 156         rc = -EPROTONOSUPPORT;
 157         if (!protocol)
 158                 goto out_rcu_unlock;
 159
 160         sock->ops = answer->ops;
 161
 162         answer_prot = answer->prot;
 163         answer_no_check = answer->no_check;
 164         answer_flags = answer->flags;
 165         rcu_read_unlock();
 166
 167         BUG_TRAP(answer_prot->slab != NULL);
 168
 169         rc = -ENOBUFS;
 170         sk = sk_alloc(PF_INET6, GFP_KERNEL,
 171                       answer_prot->slab_obj_size,
 172                       answer_prot->slab);
 173         if (sk == NULL)
 174                 goto out;
 175
 176         sock_init_data(sock, sk);
 177         sk_set_owner(sk, THIS_MODULE);
 178
 179         rc = 0;
 180         sk->sk_prot = answer_prot;
 181         sk->sk_no_check = answer_no_check;
 182         if (INET_PROTOSW_REUSE & answer_flags)
 183                 sk->sk_reuse = 1;
 184
 185         inet = inet_sk(sk);
 186
 187         if (SOCK_RAW == sock->type) {
 188                 inet->num = protocol;
 189                 if (IPPROTO_RAW == protocol)
 190                         inet->hdrincl = 1;
 191         }
 192
 193         sk->sk_destruct         = inet6_sock_destruct;
 194         sk->sk_family           = PF_INET6;
 195         sk->sk_protocol         = protocol;
 196
 197         sk->sk_backlog_rcv      = answer->prot->backlog_rcv;
 198
 199         tcp6sk          = (struct tcp6_sock *)sk;
 200         tcp6sk->pinet6 = np = inet6_sk_generic(sk);
 201         np->hop_limit   = -1;
 202         np->mcast_hops  = -1;
 203         np->mc_loop     = 1;
 204         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 205         np->ipv6only    = sysctl_ipv6_bindv6only;
 206
 207         /* Init the ipv4 part of the socket since we can have sockets
 208          * using v6 API for ipv4.
 209          */
 210         inet->uc_ttl    = -1;
 211
 212         inet->mc_loop   = 1;
 213         inet->mc_ttl    = 1;
 214         inet->mc_index  = 0;
 215         inet->mc_list   = NULL;
 216
 217         if (ipv4_config.no_pmtu_disc)
 218                 inet->pmtudisc = IP_PMTUDISC_DONT;
 219         else
 220                 inet->pmtudisc = IP_PMTUDISC_WANT;
 221
 222
 223 #ifdef INET_REFCNT_DEBUG
 224         atomic_inc(&inet6_sock_nr);
 225         atomic_inc(&inet_sock_nr);
 226 #endif
 227         if (inet->num) {
 228                 /* It assumes that any protocol which allows
 229                  * the user to assign a number at socket
 230                  * creation time automatically shares.
 231                  */
 232                 inet->sport = ntohs(inet->num);
 233                 sk->sk_prot->hash(sk);
 234         }
 235         if (sk->sk_prot->init) {
 236                 rc = sk->sk_prot->init(sk);
 237                 if (rc) {
 238                         sk_common_release(sk);
 239                         goto out;
 240                 }
 241         }
 242 out:
 243         return rc;
 244 out_rcu_unlock:
 245         rcu_read_unlock();
 246         goto out;
 247 }
 248
 249
 250 /* bind for INET6 API */
 251 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 252 {
 253         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 254         struct sock *sk = sock->sk;
 255         struct inet_opt *inet = inet_sk(sk);
 256         struct ipv6_pinfo *np = inet6_sk(sk);
 257         __u32 v4addr = 0;
 258         unsigned short snum;
 259         int addr_type = 0;
 260         int err = 0;
 261
 262         /* If the socket has its own bind function then use it. */
 263         if (sk->sk_prot->bind)
 264                 return sk->sk_prot->bind(sk, uaddr, addr_len);
 265
 266         if (addr_len < SIN6_LEN_RFC2133)
 267                 return -EINVAL;
 268         addr_type = ipv6_addr_type(&addr->sin6_addr);
 269         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 270                 return -EINVAL;
 271
 272         snum = ntohs(addr->sin6_port);
 273         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 274                 return -EACCES;
 275
 276         lock_sock(sk);
 277
 278         /* Check these errors (active socket, double bind). */
 279         if (sk->sk_state != TCP_CLOSE || inet->num) {
 280                 err = -EINVAL;
 281                 goto out;
 282         }
 283
 284         /* Check if the address belongs to the host. */
 285         if (addr_type == IPV6_ADDR_MAPPED) {
 286                 v4addr = addr->sin6_addr.s6_addr32[3];
 287                 if (inet_addr_type(v4addr) != RTN_LOCAL) {
 288                         err = -EADDRNOTAVAIL;
 289                         goto out;
 290                 }
 291         } else {
 292                 if (addr_type != IPV6_ADDR_ANY) {
 293                         struct net_device *dev = NULL;
 294
 295                         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 296                                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 297                                     addr->sin6_scope_id) {
 298                                         /* Override any existing binding, if another one
 299                                          * is supplied by user.
 300                                          */
 301                                         sk->sk_bound_dev_if = addr->sin6_scope_id;
 302                                 }
 303
 304                                 /* Binding to link-local address requires an interface */
 305                                 if (!sk->sk_bound_dev_if) {
 306                                         err = -EINVAL;
 307                                         goto out;
 308                                 }
 309                                 dev = dev_get_by_index(sk->sk_bound_dev_if);
 310                                 if (!dev) {
 311                                         err = -ENODEV;
 312                                         goto out;
 313                                 }
 314                         }
 315
 316                         /* ipv4 addr of the socket is invalid.  Only the
 317                          * unspecified and mapped address have a v4 equivalent.
 318                          */
 319                         v4addr = LOOPBACK4_IPV6;
 320                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 321                                 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
 322                                         if (dev)
 323                                                 dev_put(dev);
 324                                         err = -EADDRNOTAVAIL;
 325                                         goto out;
 326                                 }
 327                         }
 328                         if (dev)
 329                                 dev_put(dev);
 330                 }
 331         }
 332
 333         inet->rcv_saddr = v4addr;
 334         inet->saddr = v4addr;
 335
 336         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 337
 338         if (!(addr_type & IPV6_ADDR_MULTICAST))
 339                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 340
 341         /* Make sure we are allowed to bind here. */
 342         if (sk->sk_prot->get_port(sk, snum)) {
 343                 inet_reset_saddr(sk);
 344                 err = -EADDRINUSE;
 345                 goto out;
 346         }
 347
 348         if (addr_type != IPV6_ADDR_ANY)
 349                 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 350         if (snum)
 351                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 352         inet->sport = ntohs(inet->num);
 353         inet->dport = 0;
 354         inet->daddr = 0;
 355 out:
 356         release_sock(sk);
 357         return err;
 358 }
 359
 360 int inet6_release(struct socket *sock)
 361 {
 362         struct sock *sk = sock->sk;
 363
 364         if (sk == NULL)
 365                 return -EINVAL;
 366
 367         /* Free mc lists */
 368         ipv6_sock_mc_close(sk);
 369
 370         /* Free ac lists */
 371         ipv6_sock_ac_close(sk);
 372
 373         return inet_release(sock);
 374 }
 375
 376 int 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         /*
 383          *      Release destination entry
 384          */
 385
 386         sk_dst_reset(sk);
 387
 388         /* Release rx options */
 389
 390         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 391                 kfree_skb(skb);
 392
 393         /* Free flowlabels */
 394         fl6_free_socklist(sk);
 395
 396         /* Free tx options */
 397
 398         if ((opt = xchg(&np->opt, NULL)) != NULL)
 399                 sock_kfree_s(sk, opt, opt->tot_len);
 400
 401         return 0;
 402 }
 403
 404 /*
 405  *      This does both peername and sockname.
 406  */
 407
 408 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 409                  int *uaddr_len, int peer)
 410 {
 411         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 412         struct sock *sk = sock->sk;
 413         struct inet_opt *inet = inet_sk(sk);
 414         struct ipv6_pinfo *np = inet6_sk(sk);
 415
 416         sin->sin6_family = AF_INET6;
 417         sin->sin6_flowinfo = 0;
 418         sin->sin6_scope_id = 0;
 419         if (peer) {
 420                 if (!inet->dport)
 421                         return -ENOTCONN;
 422                 if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 423                     peer == 1)
 424                         return -ENOTCONN;
 425                 sin->sin6_port = inet->dport;
 426                 ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 427                 if (np->sndflow)
 428                         sin->sin6_flowinfo = np->flow_label;
 429         } else {
 430                 if (ipv6_addr_any(&np->rcv_saddr))
 431                         ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 432                 else
 433                         ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
 434
 435                 sin->sin6_port = inet->sport;
 436         }
 437         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 438                 sin->sin6_scope_id = sk->sk_bound_dev_if;
 439         *uaddr_len = sizeof(*sin);
 440         return(0);
 441 }
 442
 443 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 444 {
 445         struct sock *sk = sock->sk;
 446         int err = -EINVAL;
 447
 448         switch(cmd)
 449         {
 450         case SIOCGSTAMP:
 451                 return sock_get_timestamp(sk, (struct timeval __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                     (err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD)
 467                         return(dev_ioctl(cmd,(void __user *) arg));
 468                 return err;
 469         }
 470         /*NOTREACHED*/
 471         return(0);
 472 }
 473
 474 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 =      inet_sendmsg,                   /* ok           */
 490         .recvmsg =      sock_common_recvmsg,            /* ok           */
 491         .mmap =         sock_no_mmap,
 492         .sendpage =     tcp_sendpage
 493 };
 494
 495 struct proto_ops inet6_dgram_ops = {
 496         .family =       PF_INET6,
 497         .owner =        THIS_MODULE,
 498         .release =      inet6_release,
 499         .bind =         inet6_bind,
 500         .connect =      inet_dgram_connect,             /* ok           */
 501         .socketpair =   sock_no_socketpair,             /* a do nothing */
 502         .accept =       sock_no_accept,                 /* a do nothing */
 503         .getname =      inet6_getname,
 504         .poll =         datagram_poll,                  /* ok           */
 505         .ioctl =        inet6_ioctl,                    /* must change  */
 506         .listen =       sock_no_listen,                 /* ok           */
 507         .shutdown =     inet_shutdown,                  /* ok           */
 508         .setsockopt =   sock_common_setsockopt,         /* ok           */
 509         .getsockopt =   sock_common_getsockopt,         /* ok           */
 510         .sendmsg =      inet_sendmsg,                   /* ok           */
 511         .recvmsg =      sock_common_recvmsg,            /* ok           */
 512         .mmap =         sock_no_mmap,
 513         .sendpage =     sock_no_sendpage,
 514 };
 515
 516 static struct net_proto_family inet6_family_ops = {
 517         .family = PF_INET6,
 518         .create = inet6_create,
 519         .owner  = THIS_MODULE,
 520 };
 521
 522 #ifdef CONFIG_SYSCTL
 523 extern void ipv6_sysctl_register(void);
 524 extern void ipv6_sysctl_unregister(void);
 525 #endif
 526
 527 static struct inet_protosw rawv6_protosw = {
 528         .type           = SOCK_RAW,
 529         .protocol       = IPPROTO_IP,   /* wild card */
 530         .prot           = &rawv6_prot,
 531         .ops            = &inet6_dgram_ops,
 532         .capability     = CAP_NET_RAW,
 533         .no_check       = UDP_CSUM_DEFAULT,
 534         .flags          = INET_PROTOSW_REUSE,
 535 };
 536
 537 void
 538 inet6_register_protosw(struct inet_protosw *p)
 539 {
 540         struct list_head *lh;
 541         struct inet_protosw *answer;
 542         int protocol = p->protocol;
 543         struct list_head *last_perm;
 544
 545         spin_lock_bh(&inetsw6_lock);
 546
 547         if (p->type >= SOCK_MAX)
 548                 goto out_illegal;
 549
 550         /* If we are trying to override a permanent protocol, bail. */
 551         answer = NULL;
 552         last_perm = &inetsw6[p->type];
 553         list_for_each(lh, &inetsw6[p->type]) {
 554                 answer = list_entry(lh, struct inet_protosw, list);
 555
 556                 /* Check only the non-wild match. */
 557                 if (INET_PROTOSW_PERMANENT & answer->flags) {
 558                         if (protocol == answer->protocol)
 559                                 break;
 560                         last_perm = lh;
 561                 }
 562
 563                 answer = NULL;
 564         }
 565         if (answer)
 566                 goto out_permanent;
 567
 568         /* Add the new entry after the last permanent entry if any, so that
 569          * the new entry does not override a permanent entry when matched with
 570          * a wild-card protocol. But it is allowed to override any existing
 571          * non-permanent entry.  This means that when we remove this entry, the
 572          * system automatically returns to the old behavior.
 573          */
 574         list_add_rcu(&p->list, last_perm);
 575 out:
 576         spin_unlock_bh(&inetsw6_lock);
 577         return;
 578
 579 out_permanent:
 580         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 581                protocol);
 582         goto out;
 583
 584 out_illegal:
 585         printk(KERN_ERR
 586                "Ignoring attempt to register invalid socket type %d.\n",
 587                p->type);
 588         goto out;
 589 }
 590
 591 void
 592 inet6_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
 607 int
 608 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
 609 {
 610         if (ptr == NULL)
 611                 return -EINVAL;
 612
 613         ptr[0] = __alloc_percpu(mibsize, mibalign);
 614         if (!ptr[0])
 615                 goto err0;
 616
 617         ptr[1] = __alloc_percpu(mibsize, mibalign);
 618         if (!ptr[1])
 619                 goto err1;
 620
 621         return 0;
 622
 623 err1:
 624         free_percpu(ptr[0]);
 625         ptr[0] = NULL;
 626 err0:
 627         return -ENOMEM;
 628 }
 629
 630 void
 631 snmp6_mib_free(void *ptr[2])
 632 {
 633         if (ptr == NULL)
 634                 return;
 635         free_percpu(ptr[0]);
 636         free_percpu(ptr[1]);
 637         ptr[0] = ptr[1] = NULL;
 638 }
 639
 640 static int __init init_ipv6_mibs(void)
 641 {
 642         if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 643                            __alignof__(struct ipstats_mib)) < 0)
 644                 goto err_ip_mib;
 645         if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 646                            __alignof__(struct icmpv6_mib)) < 0)
 647                 goto err_icmp_mib;
 648         if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 649                            __alignof__(struct udp_mib)) < 0)
 650                 goto err_udp_mib;
 651         return 0;
 652
 653 err_udp_mib:
 654         snmp6_mib_free((void **)icmpv6_statistics);
 655 err_icmp_mib:
 656         snmp6_mib_free((void **)ipv6_statistics);
 657 err_ip_mib:
 658         return -ENOMEM;
 659
 660 }
 661
 662 static void cleanup_ipv6_mibs(void)
 663 {
 664         snmp6_mib_free((void **)ipv6_statistics);
 665         snmp6_mib_free((void **)icmpv6_statistics);
 666         snmp6_mib_free((void **)udp_stats_in6);
 667 }
 668
 669 extern int ipv6_misc_proc_init(void);
 670
 671 static int __init inet6_init(void)
 672 {
 673         struct sk_buff *dummy_skb;
 674         struct list_head *r;
 675         int err;
 676
 677 #ifdef MODULE
 678 #if 0 /* FIXME --RR */
 679         if (!mod_member_present(&__this_module, can_unload))
 680           return -EINVAL;
 681
 682         __this_module.can_unload = &ipv6_unload;
 683 #endif
 684 #endif
 685
 686         if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
 687                 printk(KERN_CRIT "inet6_proto_init: size fault\n");
 688                 return -EINVAL;
 689         }
 690
 691         err = sk_alloc_slab(&tcpv6_prot, "tcpv6_sock");
 692         if (err) {
 693                 sk_alloc_slab_error(&tcpv6_prot);
 694                 goto out;
 695         }
 696         err = sk_alloc_slab(&udpv6_prot, "udpv6_sock");
 697         if (err) {
 698                 sk_alloc_slab_error(&udpv6_prot);
 699                 goto out_tcp_free_slab;
 700         }
 701         err = sk_alloc_slab(&rawv6_prot, "rawv6_sock");
 702         if (err) {
 703                 sk_alloc_slab_error(&rawv6_prot);
 704                 goto out_udp_free_slab;
 705         }
 706
 707         /* Register the socket-side information for inet6_create.  */
 708         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 709                 INIT_LIST_HEAD(r);
 710
 711         /* We MUST register RAW sockets before we create the ICMP6,
 712          * IGMP6, or NDISC control sockets.
 713          */
 714         inet6_register_protosw(&rawv6_protosw);
 715
 716         /* Register the family here so that the init calls below will
 717          * be able to create sockets. (?? is this dangerous ??)
 718          */
 719         (void) sock_register(&inet6_family_ops);
 720
 721         /* Initialise ipv6 mibs */
 722         err = init_ipv6_mibs();
 723         if (err)
 724                 goto out_raw_free_slab;
 725
 726         /*
 727          *      ipngwg API draft makes clear that the correct semantics
 728          *      for TCP and UDP is to consider one TCP and UDP instance
 729          *      in a host availiable by both INET and INET6 APIs and
 730          *      able to communicate via both network protocols.
 731          */
 732
 733 #ifdef CONFIG_SYSCTL
 734         ipv6_sysctl_register();
 735 #endif
 736         err = icmpv6_init(&inet6_family_ops);
 737         if (err)
 738                 goto icmp_fail;
 739         err = ndisc_init(&inet6_family_ops);
 740         if (err)
 741                 goto ndisc_fail;
 742         err = igmp6_init(&inet6_family_ops);
 743         if (err)
 744                 goto igmp_fail;
 745         /* Create /proc/foo6 entries. */
 746 #ifdef CONFIG_PROC_FS
 747         err = -ENOMEM;
 748         if (raw6_proc_init())
 749                 goto proc_raw6_fail;
 750         if (tcp6_proc_init())
 751                 goto proc_tcp6_fail;
 752         if (udp6_proc_init())
 753                 goto proc_udp6_fail;
 754         if (ipv6_misc_proc_init())
 755                 goto proc_misc6_fail;
 756
 757         if (ac6_proc_init())
 758                 goto proc_anycast6_fail;
 759         if (if6_proc_init())
 760                 goto proc_if6_fail;
 761 #endif
 762         ipv6_packet_init();
 763         ip6_route_init();
 764         ip6_flowlabel_init();
 765         addrconf_init();
 766         sit_init();
 767
 768         /* Init v6 extension headers. */
 769         ipv6_rthdr_init();
 770         ipv6_frag_init();
 771         ipv6_nodata_init();
 772         ipv6_destopt_init();
 773
 774         /* Init v6 transport protocols. */
 775         udpv6_init();
 776         tcpv6_init();
 777         err = 0;
 778 out:
 779         return err;
 780
 781 #ifdef CONFIG_PROC_FS
 782 proc_if6_fail:
 783         ac6_proc_exit();
 784 proc_anycast6_fail:
 785         ipv6_misc_proc_exit();
 786 proc_misc6_fail:
 787         udp6_proc_exit();
 788 proc_udp6_fail:
 789         tcp6_proc_exit();
 790 proc_tcp6_fail:
 791         raw6_proc_exit();
 792 proc_raw6_fail:
 793         igmp6_cleanup();
 794 #endif
 795 igmp_fail:
 796         ndisc_cleanup();
 797 ndisc_fail:
 798         icmpv6_cleanup();
 799 icmp_fail:
 800 #ifdef CONFIG_SYSCTL
 801         ipv6_sysctl_unregister();
 802 #endif
 803         cleanup_ipv6_mibs();
 804 out_raw_free_slab:
 805         sk_free_slab(&rawv6_prot);
 806 out_udp_free_slab:
 807         sk_free_slab(&udpv6_prot);
 808 out_tcp_free_slab:
 809         sk_free_slab(&tcpv6_prot);
 810         goto out;
 811 }
 812 module_init(inet6_init);
 813
 814 static void __exit inet6_exit(void)
 815 {
 816         /* First of all disallow new sockets creation. */
 817         sock_unregister(PF_INET6);
 818 #ifdef CONFIG_PROC_FS
 819         if6_proc_exit();
 820         ac6_proc_exit();
 821         ipv6_misc_proc_exit();
 822         udp6_proc_exit();
 823         tcp6_proc_exit();
 824         raw6_proc_exit();
 825 #endif
 826         /* Cleanup code parts. */
 827         sit_cleanup();
 828         ip6_flowlabel_cleanup();
 829         addrconf_cleanup();
 830         ip6_route_cleanup();
 831         ipv6_packet_cleanup();
 832         igmp6_cleanup();
 833         ndisc_cleanup();
 834         icmpv6_cleanup();
 835 #ifdef CONFIG_SYSCTL
 836         ipv6_sysctl_unregister();
 837 #endif
 838         cleanup_ipv6_mibs();
 839         sk_free_slab(&rawv6_prot);
 840         sk_free_slab(&udpv6_prot);
 841         sk_free_slab(&tcpv6_prot);
 842 }
 843 module_exit(inet6_exit);
 844
 845 MODULE_ALIAS_NETPROTO(PF_INET6);