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 #include <linux/version.h>
  44
  45 #include <linux/inet.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/icmpv6.h>
  48 #include <linux/brlock.h>
  49 #include <linux/smp_lock.h>
  50
  51 #include <net/ip.h>
  52 #include <net/ipv6.h>
  53 #include <net/udp.h>
  54 #include <net/tcp.h>
  55 #include <net/ipip.h>
  56 #include <net/protocol.h>
  57 #include <net/inet_common.h>
  58 #include <net/transp_v6.h>
  59 #include <net/ip6_route.h>
  60 #include <net/addrconf.h>
  61
  62 #include <asm/uaccess.h>
  63 #include <asm/system.h>
  64
  65 #ifdef MODULE
  66 static int unloadable = 0; /* XX: Turn to one when all is ok within the
  67                               module for allowing unload */
  68 #endif
  69
  70 #if defined(MODULE) && LINUX_VERSION_CODE > 0x20115
  71 MODULE_AUTHOR("Cast of dozens");
  72 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  73 MODULE_PARM(unloadable, "i");
  74 #endif
  75
  76 /* IPv6 procfs goodies... */
  77
  78 #ifdef CONFIG_PROC_FS
  79 extern int raw6_get_info(char *, char **, off_t, int);
  80 extern int tcp6_get_info(char *, char **, off_t, int);
  81 extern int udp6_get_info(char *, char **, off_t, int);
  82 extern int afinet6_get_info(char *, char **, off_t, int);
  83 extern int afinet6_get_snmp(char *, char **, off_t, int);
  84 #endif
  85
  86 #ifdef CONFIG_SYSCTL
  87 extern void ipv6_sysctl_register(void);
  88 extern void ipv6_sysctl_unregister(void);
  89 #endif
  90
  91 int sysctl_ipv6_bindv6only;
  92
  93 #ifdef INET_REFCNT_DEBUG
  94 atomic_t inet6_sock_nr;
  95 #endif
  96
  97 /* Per protocol sock slabcache */
  98 kmem_cache_t *tcp6_sk_cachep;
  99 kmem_cache_t *udp6_sk_cachep;
 100 kmem_cache_t *raw6_sk_cachep;
 101
 102 /* The inetsw table contains everything that inet_create needs to
 103  * build a new socket.
 104  */
 105 struct list_head inetsw6[SOCK_MAX];
 106
 107 static void inet6_sock_destruct(struct sock *sk)
 108 {
 109         inet_sock_destruct(sk);
 110
 111 #ifdef INET_REFCNT_DEBUG
 112         atomic_dec(&inet6_sock_nr);
 113 #endif
 114         MOD_DEC_USE_COUNT;
 115 }
 116
 117 static __inline__ kmem_cache_t *inet6_sk_slab(int protocol)
 118 {
 119         kmem_cache_t* rc = tcp6_sk_cachep;
 120
 121         if (protocol == IPPROTO_UDP)
 122                 rc = udp6_sk_cachep;
 123         else if (protocol == IPPROTO_RAW)
 124                 rc = raw6_sk_cachep;
 125         return rc;
 126 }
 127
 128 static __inline__ int inet6_sk_size(int protocol)
 129 {
 130         int rc = sizeof(struct tcp6_sock);
 131
 132         if (protocol == IPPROTO_UDP)
 133                 rc = sizeof(struct udp6_sock);
 134         else if (protocol == IPPROTO_RAW)
 135                 rc = sizeof(struct raw6_sock);
 136         return rc;
 137 }
 138
 139 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 140 {
 141         struct ipv6_pinfo *rc = (&((struct tcp6_sock *)sk)->inet6);
 142
 143         if (sk->protocol == IPPROTO_UDP)
 144                 rc = (&((struct udp6_sock *)sk)->inet6);
 145         else if (sk->protocol == IPPROTO_RAW)
 146                 rc = (&((struct raw6_sock *)sk)->inet6);
 147         return rc;
 148 }
 149
 150 static int inet6_create(struct socket *sock, int protocol)
 151 {
 152         struct inet_opt *inet;
 153         struct ipv6_pinfo *np;
 154         struct sock *sk;
 155         struct tcp6_sock* tcp6sk;
 156         struct list_head *p;
 157         struct inet_protosw *answer;
 158
 159         sk = sk_alloc(PF_INET6, GFP_KERNEL, inet6_sk_size(protocol),
 160                       inet6_sk_slab(protocol));
 161         if (sk == NULL)
 162                 goto do_oom;
 163
 164         /* Look for the requested type/protocol pair. */
 165         answer = NULL;
 166         br_read_lock_bh(BR_NETPROTO_LOCK);
 167         list_for_each(p, &inetsw6[sock->type]) {
 168                 answer = list_entry(p, struct inet_protosw, list);
 169
 170                 /* Check the non-wild match. */
 171                 if (protocol == answer->protocol) {
 172                         if (protocol != IPPROTO_IP)
 173                                 break;
 174                 } else {
 175                         /* Check for the two wild cases. */
 176                         if (IPPROTO_IP == protocol) {
 177                                 protocol = answer->protocol;
 178                                 break;
 179                         }
 180                         if (IPPROTO_IP == answer->protocol)
 181                                 break;
 182                 }
 183                 answer = NULL;
 184         }
 185         br_read_unlock_bh(BR_NETPROTO_LOCK);
 186
 187         if (!answer)
 188                 goto free_and_badtype;
 189         if (answer->capability > 0 && !capable(answer->capability))
 190                 goto free_and_badperm;
 191         if (!protocol)
 192                 goto free_and_noproto;
 193
 194         sock->ops = answer->ops;
 195         sock_init_data(sock, sk);
 196
 197         sk->prot = answer->prot;
 198         sk->no_check = answer->no_check;
 199         if (INET_PROTOSW_REUSE & answer->flags)
 200                 sk->reuse = 1;
 201
 202         inet = inet_sk(sk);
 203
 204         if (SOCK_RAW == sock->type) {
 205                 inet->num = protocol;
 206                 if (IPPROTO_RAW == protocol)
 207                         inet->hdrincl = 1;
 208         }
 209
 210         sk->destruct            = inet6_sock_destruct;
 211         sk->zapped              = 0;
 212         sk->family              = PF_INET6;
 213         sk->protocol            = protocol;
 214
 215         sk->backlog_rcv         = answer->prot->backlog_rcv;
 216
 217         tcp6sk          = (struct tcp6_sock *)sk;
 218         tcp6sk->pinet6 = np = inet6_sk_generic(sk);
 219         np->hop_limit   = -1;
 220         np->mcast_hops  = -1;
 221         np->mc_loop     = 1;
 222         np->pmtudisc    = IPV6_PMTUDISC_WANT;
 223         np->ipv6only    = sysctl_ipv6_bindv6only;
 224
 225         /* Init the ipv4 part of the socket since we can have sockets
 226          * using v6 API for ipv4.
 227          */
 228         inet->ttl       = 64;
 229
 230         inet->mc_loop   = 1;
 231         inet->mc_ttl    = 1;
 232         inet->mc_index  = 0;
 233         inet->mc_list   = NULL;
 234
 235         if (ipv4_config.no_pmtu_disc)
 236                 inet->pmtudisc = IP_PMTUDISC_DONT;
 237         else
 238                 inet->pmtudisc = IP_PMTUDISC_WANT;
 239
 240
 241 #ifdef INET_REFCNT_DEBUG
 242         atomic_inc(&inet6_sock_nr);
 243         atomic_inc(&inet_sock_nr);
 244 #endif
 245         MOD_INC_USE_COUNT;
 246
 247         if (inet->num) {
 248                 /* It assumes that any protocol which allows
 249                  * the user to assign a number at socket
 250                  * creation time automatically shares.
 251                  */
 252                 inet->sport = ntohs(inet->num);
 253                 sk->prot->hash(sk);
 254         }
 255         if (sk->prot->init) {
 256                 int err = sk->prot->init(sk);
 257                 if (err != 0) {
 258                         MOD_DEC_USE_COUNT;
 259                         inet_sock_release(sk);
 260                         return err;
 261                 }
 262         }
 263         return 0;
 264
 265 free_and_badtype:
 266         sk_free(sk);
 267         return -ESOCKTNOSUPPORT;
 268 free_and_badperm:
 269         sk_free(sk);
 270         return -EPERM;
 271 free_and_noproto:
 272         sk_free(sk);
 273         return -EPROTONOSUPPORT;
 274 do_oom:
 275         return -ENOBUFS;
 276 }
 277
 278
 279 /* bind for INET6 API */
 280 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 281 {
 282         struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 283         struct sock *sk = sock->sk;
 284         struct inet_opt *inet = inet_sk(sk);
 285         struct ipv6_pinfo *np = inet6_sk(sk);
 286         __u32 v4addr = 0;
 287         unsigned short snum;
 288         int addr_type = 0;
 289
 290         /* If the socket has its own bind function then use it. */
 291         if(sk->prot->bind)
 292                 return sk->prot->bind(sk, uaddr, addr_len);
 293
 294         if (addr_len < SIN6_LEN_RFC2133)
 295                 return -EINVAL;
 296         addr_type = ipv6_addr_type(&addr->sin6_addr);
 297         if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 298                 return -EINVAL;
 299
 300         /* Check if the address belongs to the host. */
 301         if (addr_type == IPV6_ADDR_MAPPED) {
 302                 v4addr = addr->sin6_addr.s6_addr32[3];
 303                 if (inet_addr_type(v4addr) != RTN_LOCAL)
 304                         return -EADDRNOTAVAIL;
 305         } else {
 306                 if (addr_type != IPV6_ADDR_ANY) {
 307                         /* ipv4 addr of the socket is invalid.  Only the
 308                          * unpecified and mapped address have a v4 equivalent.
 309                          */
 310                         v4addr = LOOPBACK4_IPV6;
 311                         if (!(addr_type & IPV6_ADDR_MULTICAST)) {
 312                                 if (!ipv6_chk_addr(&addr->sin6_addr, NULL))
 313                                         return -EADDRNOTAVAIL;
 314                         }
 315                 }
 316         }
 317
 318         snum = ntohs(addr->sin6_port);
 319         if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 320                 return -EACCES;
 321
 322         lock_sock(sk);
 323
 324         /* Check these errors (active socket, double bind). */
 325         if (sk->state != TCP_CLOSE || inet->num) {
 326                 release_sock(sk);
 327                 return -EINVAL;
 328         }
 329
 330         if (addr_type & IPV6_ADDR_LINKLOCAL) {
 331                 if (addr_len >= sizeof(struct sockaddr_in6) &&
 332                     addr->sin6_scope_id) {
 333                         /* Override any existing binding, if another one
 334                          * is supplied by user.
 335                          */
 336                         sk->bound_dev_if = addr->sin6_scope_id;
 337                 }
 338
 339                 /* Binding to link-local address requires an interface */
 340                 if (sk->bound_dev_if == 0) {
 341                         release_sock(sk);
 342                         return -EINVAL;
 343                 }
 344         }
 345
 346         inet->rcv_saddr = v4addr;
 347         inet->saddr = v4addr;
 348
 349         ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
 350
 351         if (!(addr_type & IPV6_ADDR_MULTICAST))
 352                 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
 353
 354         /* Make sure we are allowed to bind here. */
 355         if (sk->prot->get_port(sk, snum) != 0) {
 356                 inet->rcv_saddr = inet->saddr = 0;
 357                 memset(&np->rcv_saddr, 0, sizeof(struct in6_addr));
 358                 memset(&np->saddr, 0, sizeof(struct in6_addr));
 359
 360                 release_sock(sk);
 361                 return -EADDRINUSE;
 362         }
 363
 364         if (addr_type != IPV6_ADDR_ANY)
 365                 sk->userlocks |= SOCK_BINDADDR_LOCK;
 366         if (snum)
 367                 sk->userlocks |= SOCK_BINDPORT_LOCK;
 368         inet->sport = ntohs(inet->num);
 369         inet->dport = 0;
 370         inet->daddr = 0;
 371         release_sock(sk);
 372
 373         return 0;
 374 }
 375
 376 int inet6_release(struct socket *sock)
 377 {
 378         struct sock *sk = sock->sk;
 379
 380         if (sk == NULL)
 381                 return -EINVAL;
 382
 383         /* Free mc lists */
 384         ipv6_sock_mc_close(sk);
 385
 386         return inet_release(sock);
 387 }
 388
 389 int inet6_destroy_sock(struct sock *sk)
 390 {
 391         struct ipv6_pinfo *np = inet6_sk(sk);
 392         struct sk_buff *skb;
 393         struct ipv6_txoptions *opt;
 394
 395         /*
 396          *      Release destination entry
 397          */
 398
 399         sk_dst_reset(sk);
 400
 401         /* Release rx options */
 402
 403         if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 404                 kfree_skb(skb);
 405
 406         /* Free flowlabels */
 407         fl6_free_socklist(sk);
 408
 409         /* Free tx options */
 410
 411         if ((opt = xchg(&np->opt, NULL)) != NULL)
 412                 sock_kfree_s(sk, opt, opt->tot_len);
 413
 414         return 0;
 415 }
 416
 417 /*
 418  *      This does both peername and sockname.
 419  */
 420
 421 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 422                  int *uaddr_len, int peer)
 423 {
 424         struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 425         struct sock *sk = sock->sk;
 426         struct inet_opt *inet = inet_sk(sk);
 427         struct ipv6_pinfo *np = inet6_sk(sk);
 428
 429         sin->sin6_family = AF_INET6;
 430         sin->sin6_flowinfo = 0;
 431         sin->sin6_scope_id = 0;
 432         if (peer) {
 433                 if (!inet->dport)
 434                         return -ENOTCONN;
 435                 if (((1<<sk->state)&(TCPF_CLOSE|TCPF_SYN_SENT)) && peer == 1)
 436                         return -ENOTCONN;
 437                 sin->sin6_port = inet->dport;
 438                 memcpy(&sin->sin6_addr, &np->daddr, sizeof(struct in6_addr));
 439                 if (np->sndflow)
 440                         sin->sin6_flowinfo = np->flow_label;
 441         } else {
 442                 if (ipv6_addr_type(&np->rcv_saddr) == IPV6_ADDR_ANY)
 443                         memcpy(&sin->sin6_addr, &np->saddr,
 444                                sizeof(struct in6_addr));
 445                 else
 446                         memcpy(&sin->sin6_addr, &np->rcv_saddr,
 447                                sizeof(struct in6_addr));
 448
 449                 sin->sin6_port = inet->sport;
 450         }
 451         if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 452                 sin->sin6_scope_id = sk->bound_dev_if;
 453         *uaddr_len = sizeof(*sin);
 454         return(0);
 455 }
 456
 457 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 458 {
 459         struct sock *sk = sock->sk;
 460         int err = -EINVAL;
 461
 462         switch(cmd)
 463         {
 464         case SIOCGSTAMP:
 465                 if(sk->stamp.tv_sec==0)
 466                         return -ENOENT;
 467                 err = copy_to_user((void *)arg, &sk->stamp,
 468                                    sizeof(struct timeval));
 469                 if (err)
 470                         return -EFAULT;
 471                 return 0;
 472
 473         case SIOCADDRT:
 474         case SIOCDELRT:
 475
 476                 return(ipv6_route_ioctl(cmd,(void *)arg));
 477
 478         case SIOCSIFADDR:
 479                 return addrconf_add_ifaddr((void *) arg);
 480         case SIOCDIFADDR:
 481                 return addrconf_del_ifaddr((void *) arg);
 482         case SIOCSIFDSTADDR:
 483                 return addrconf_set_dstaddr((void *) arg);
 484         default:
 485                 if(sk->prot->ioctl==0 || (err=sk->prot->ioctl(sk, cmd, arg))==-ENOIOCTLCMD)
 486                         return(dev_ioctl(cmd,(void *) arg));
 487                 return err;
 488         }
 489         /*NOTREACHED*/
 490         return(0);
 491 }
 492
 493 struct proto_ops inet6_stream_ops = {
 494         .family =       PF_INET6,
 495
 496         .release =      inet6_release,
 497         .bind =         inet6_bind,
 498         .connect =      inet_stream_connect,            /* ok           */
 499         .socketpair =   sock_no_socketpair,             /* a do nothing */
 500         .accept =       inet_accept,                    /* ok           */
 501         .getname =      inet6_getname,
 502         .poll =         tcp_poll,                       /* ok           */
 503         .ioctl =        inet6_ioctl,                    /* must change  */
 504         .listen =       inet_listen,                    /* ok           */
 505         .shutdown =     inet_shutdown,                  /* ok           */
 506         .setsockopt =   inet_setsockopt,                /* ok           */
 507         .getsockopt =   inet_getsockopt,                /* ok           */
 508         .sendmsg =      inet_sendmsg,                   /* ok           */
 509         .recvmsg =      inet_recvmsg,                   /* ok           */
 510         .mmap =         sock_no_mmap,
 511         .sendpage =     tcp_sendpage
 512 };
 513
 514 struct proto_ops inet6_dgram_ops = {
 515         .family =       PF_INET6,
 516
 517         .release =      inet6_release,
 518         .bind =         inet6_bind,
 519         .connect =      inet_dgram_connect,             /* ok           */
 520         .socketpair =   sock_no_socketpair,             /* a do nothing */
 521         .accept =       sock_no_accept,                 /* a do nothing */
 522         .getname =      inet6_getname,
 523         .poll =         datagram_poll,                  /* ok           */
 524         .ioctl =        inet6_ioctl,                    /* must change  */
 525         .listen =       sock_no_listen,                 /* ok           */
 526         .shutdown =     inet_shutdown,                  /* ok           */
 527         .setsockopt =   inet_setsockopt,                /* ok           */
 528         .getsockopt =   inet_getsockopt,                /* ok           */
 529         .sendmsg =      inet_sendmsg,                   /* ok           */
 530         .recvmsg =      inet_recvmsg,                   /* ok           */
 531         .mmap =         sock_no_mmap,
 532         .sendpage =     sock_no_sendpage,
 533 };
 534
 535 struct net_proto_family inet6_family_ops = {
 536         .family =PF_INET6,
 537         .create =inet6_create,
 538 };
 539
 540 #ifdef MODULE
 541 #if 0 /* FIXME --RR */
 542 int ipv6_unload(void)
 543 {
 544         if (!unloadable) return 1;
 545         /* We keep internally 3 raw sockets */
 546         return atomic_read(&(__this_module.uc.usecount)) - 3;
 547 }
 548 #endif
 549 #endif
 550
 551 #if defined(MODULE) && defined(CONFIG_SYSCTL)
 552 extern void ipv6_sysctl_register(void);
 553 extern void ipv6_sysctl_unregister(void);
 554 #endif
 555
 556 static struct inet_protosw rawv6_protosw = {
 557         .type =      SOCK_RAW,
 558         .protocol =  IPPROTO_IP,        /* wild card */
 559         .prot =      &rawv6_prot,
 560         .ops =       &inet6_dgram_ops,
 561         .capability =CAP_NET_RAW,
 562         .no_check =  UDP_CSUM_DEFAULT,
 563         .flags =     INET_PROTOSW_REUSE,
 564 };
 565
 566 #define INETSW6_ARRAY_LEN (sizeof(inetsw6_array) / sizeof(struct inet_protosw))
 567
 568 void
 569 inet6_register_protosw(struct inet_protosw *p)
 570 {
 571         struct list_head *lh;
 572         struct inet_protosw *answer;
 573         int protocol = p->protocol;
 574
 575         br_write_lock_bh(BR_NETPROTO_LOCK);
 576
 577         if (p->type > SOCK_MAX)
 578                 goto out_illegal;
 579
 580         /* If we are trying to override a permanent protocol, bail. */
 581         answer = NULL;
 582         list_for_each(lh, &inetsw6[p->type]) {
 583                 answer = list_entry(lh, struct inet_protosw, list);
 584
 585                 /* Check only the non-wild match. */
 586                 if (protocol == answer->protocol &&
 587                     (INET_PROTOSW_PERMANENT & answer->flags))
 588                         break;
 589
 590                 answer = NULL;
 591         }
 592         if (answer)
 593                 goto out_permanent;
 594
 595         /* Add to the BEGINNING so that we override any existing
 596          * entry.  This means that when we remove this entry, the
 597          * system automatically returns to the old behavior.
 598          */
 599         list_add(&p->list, &inetsw6[p->type]);
 600 out:
 601         br_write_unlock_bh(BR_NETPROTO_LOCK);
 602         return;
 603
 604 out_permanent:
 605         printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 606                protocol);
 607         goto out;
 608
 609 out_illegal:
 610         printk(KERN_ERR
 611                "Ignoring attempt to register illegal socket type %d.\n",
 612                p->type);
 613         goto out;
 614 }
 615
 616 void
 617 inet6_unregister_protosw(struct inet_protosw *p)
 618 {
 619         inet_unregister_protosw(p);
 620 }
 621
 622 static int __init inet6_init(void)
 623 {
 624         struct sk_buff *dummy_skb;
 625         struct list_head *r;
 626         int err;
 627
 628 #ifdef MODULE
 629 #if 0 /* FIXME --RR */
 630         if (!mod_member_present(&__this_module, can_unload))
 631           return -EINVAL;
 632
 633         __this_module.can_unload = &ipv6_unload;
 634 #endif
 635 #endif
 636
 637         printk(KERN_INFO "IPv6 v0.8 for NET4.0\n");
 638
 639         if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb))
 640         {
 641                 printk(KERN_CRIT "inet6_proto_init: size fault\n");
 642                 return -EINVAL;
 643         }
 644         /* allocate our sock slab caches */
 645         tcp6_sk_cachep = kmem_cache_create("tcp6_sock",
 646                                            sizeof(struct tcp6_sock), 0,
 647                                            SLAB_HWCACHE_ALIGN, 0, 0);
 648         udp6_sk_cachep = kmem_cache_create("udp6_sock",
 649                                            sizeof(struct udp6_sock), 0,
 650                                            SLAB_HWCACHE_ALIGN, 0, 0);
 651         raw6_sk_cachep = kmem_cache_create("raw6_sock",
 652                                            sizeof(struct raw6_sock), 0,
 653                                            SLAB_HWCACHE_ALIGN, 0, 0);
 654         if (!tcp6_sk_cachep || !udp6_sk_cachep || !raw6_sk_cachep)
 655                 printk(KERN_CRIT "%s: Can't create protocol sock SLAB "
 656                        "caches!\n", __FUNCTION__);
 657
 658         /* Register the socket-side information for inet6_create.  */
 659         for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 660                 INIT_LIST_HEAD(r);
 661
 662         /* We MUST register RAW sockets before we create the ICMP6,
 663          * IGMP6, or NDISC control sockets.
 664          */
 665         inet6_register_protosw(&rawv6_protosw);
 666
 667         /* Register the family here so that the init calls below will
 668          * be able to create sockets. (?? is this dangerous ??)
 669          */
 670         (void) sock_register(&inet6_family_ops);
 671
 672         /*
 673          *      ipngwg API draft makes clear that the correct semantics
 674          *      for TCP and UDP is to consider one TCP and UDP instance
 675          *      in a host availiable by both INET and INET6 APIs and
 676          *      able to communicate via both network protocols.
 677          */
 678
 679 #if defined(MODULE) && defined(CONFIG_SYSCTL)
 680         ipv6_sysctl_register();
 681 #endif
 682         err = icmpv6_init(&inet6_family_ops);
 683         if (err)
 684                 goto icmp_fail;
 685         err = ndisc_init(&inet6_family_ops);
 686         if (err)
 687                 goto ndisc_fail;
 688         err = igmp6_init(&inet6_family_ops);
 689         if (err)
 690                 goto igmp_fail;
 691         /* Create /proc/foo6 entries. */
 692 #ifdef CONFIG_PROC_FS
 693         err = -ENOMEM;
 694         if (!proc_net_create("raw6", 0, raw6_get_info))
 695                 goto proc_raw6_fail;
 696         if (!proc_net_create("tcp6", 0, tcp6_get_info))
 697                 goto proc_tcp6_fail;
 698         if (!proc_net_create("udp6", 0, udp6_get_info))
 699                 goto proc_udp6_fail;
 700         if (!proc_net_create("sockstat6", 0, afinet6_get_info))
 701                 goto proc_sockstat6_fail;
 702         if (!proc_net_create("snmp6", 0, afinet6_get_snmp))
 703                 goto proc_snmp6_fail;
 704 #endif
 705         ipv6_netdev_notif_init();
 706         ipv6_packet_init();
 707         ip6_route_init();
 708         ip6_flowlabel_init();
 709         addrconf_init();
 710         sit_init();
 711
 712         /* Init v6 transport protocols. */
 713         udpv6_init();
 714         tcpv6_init();
 715
 716         return 0;
 717
 718 #ifdef CONFIG_PROC_FS
 719 proc_snmp6_fail:
 720         proc_net_remove("sockstat6");
 721 proc_sockstat6_fail:
 722         proc_net_remove("udp6");
 723 proc_udp6_fail:
 724         proc_net_remove("tcp6");
 725 proc_tcp6_fail:
 726         proc_net_remove("raw6");
 727 proc_raw6_fail:
 728         igmp6_cleanup();
 729 #endif
 730 igmp_fail:
 731         ndisc_cleanup();
 732 ndisc_fail:
 733         icmpv6_cleanup();
 734 icmp_fail:
 735 #if defined(MODULE) && defined(CONFIG_SYSCTL)
 736         ipv6_sysctl_unregister();
 737 #endif
 738         return err;
 739 }
 740 module_init(inet6_init);
 741
 742
 743 #ifdef MODULE
 744 static void inet6_exit(void)
 745 {
 746         /* First of all disallow new sockets creation. */
 747         sock_unregister(PF_INET6);
 748 #ifdef CONFIG_PROC_FS
 749         proc_net_remove("raw6");
 750         proc_net_remove("tcp6");
 751         proc_net_remove("udp6");
 752         proc_net_remove("sockstat6");
 753         proc_net_remove("snmp6");
 754 #endif
 755         /* Cleanup code parts. */
 756         sit_cleanup();
 757         ipv6_netdev_notif_cleanup();
 758         ip6_flowlabel_cleanup();
 759         addrconf_cleanup();
 760         ip6_route_cleanup();
 761         ipv6_packet_cleanup();
 762         igmp6_cleanup();
 763         ndisc_cleanup();
 764         icmpv6_cleanup();
 765 #ifdef CONFIG_SYSCTL
 766         ipv6_sysctl_unregister();
 767 #endif
 768 }
 769 module_exit(inet6_exit);
 770 #endif /* MODULE */
 771 MODULE_LICENSE("GPL");