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af_inet6.c

/*
 *    PF_INET6 socket protocol family
 *    Linux INET6 implementation
 *
 *    Authors:
 *    Pedro Roque       <roque@di.fc.ul.pt>
 *
 *    Adapted from linux/net/ipv4/af_inet.c
 *
 *    $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
 *
 *    Fixes:
 *    piggy, Karl Knutson     :     Socket protocol table
 *    Hideaki YOSHIFUJI :     sin6_scope_id support
 *    Arnaldo Melo            :     check proc_net_create return, cleanups
 *
 *    This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */


#include <linux/module.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>

#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/icmpv6.h>
#include <linux/netfilter_ipv6.h>

#include <net/ip.h>
#include <net/ipv6.h>
#include <net/udp.h>
#include <net/udplite.h>
#include <net/tcp.h>
#include <net/ipip.h>
#include <net/protocol.h>
#include <net/inet_common.h>
#include <net/transp_v6.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#ifdef CONFIG_IPV6_TUNNEL
#include <net/ip6_tunnel.h>
#endif

#include <asm/uaccess.h>
#include <asm/system.h>

MODULE_AUTHOR("Cast of dozens");
MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
MODULE_LICENSE("GPL");

int sysctl_ipv6_bindv6only __read_mostly;

/* The inetsw table contains everything that inet_create needs to
 * build a new socket.
 */
static struct list_head inetsw6[SOCK_MAX];
static DEFINE_SPINLOCK(inetsw6_lock);

static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
{
      const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);

      return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
}

static int inet6_create(struct net *net, struct socket *sock, int protocol)
{
      struct inet_sock *inet;
      struct ipv6_pinfo *np;
      struct sock *sk;
      struct list_head *p;
      struct inet_protosw *answer;
      struct proto *answer_prot;
      unsigned char answer_flags;
      char answer_no_check;
      int try_loading_module = 0;
      int err;

      if (net != &init_net)
            return -EAFNOSUPPORT;

      if (sock->type != SOCK_RAW &&
          sock->type != SOCK_DGRAM &&
          !inet_ehash_secret)
            build_ehash_secret();

      /* Look for the requested type/protocol pair. */
      answer = NULL;
lookup_protocol:
      err = -ESOCKTNOSUPPORT;
      rcu_read_lock();
      list_for_each_rcu(p, &inetsw6[sock->type]) {
            answer = list_entry(p, struct inet_protosw, list);

            /* Check the non-wild match. */
            if (protocol == answer->protocol) {
                  if (protocol != IPPROTO_IP)
                        break;
            } else {
                  /* Check for the two wild cases. */
                  if (IPPROTO_IP == protocol) {
                        protocol = answer->protocol;
                        break;
                  }
                  if (IPPROTO_IP == answer->protocol)
                        break;
            }
            err = -EPROTONOSUPPORT;
            answer = NULL;
      }

      if (!answer) {
            if (try_loading_module < 2) {
                  rcu_read_unlock();
                  /*
                   * Be more specific, e.g. net-pf-10-proto-132-type-1
                   * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
                   */
                  if (++try_loading_module == 1)
                        request_module("net-pf-%d-proto-%d-type-%d",
                                    PF_INET6, protocol, sock->type);
                  /*
                   * Fall back to generic, e.g. net-pf-10-proto-132
                   * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
                   */
                  else
                        request_module("net-pf-%d-proto-%d",
                                    PF_INET6, protocol);
                  goto lookup_protocol;
            } else
                  goto out_rcu_unlock;
      }

      err = -EPERM;
      if (answer->capability > 0 && !capable(answer->capability))
            goto out_rcu_unlock;

      sock->ops = answer->ops;
      answer_prot = answer->prot;
      answer_no_check = answer->no_check;
      answer_flags = answer->flags;
      rcu_read_unlock();

      BUG_TRAP(answer_prot->slab != NULL);

      err = -ENOBUFS;
      sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
      if (sk == NULL)
            goto out;

      sock_init_data(sock, sk);

      err = 0;
      sk->sk_no_check = answer_no_check;
      if (INET_PROTOSW_REUSE & answer_flags)
            sk->sk_reuse = 1;

      inet = inet_sk(sk);
      inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;

      if (SOCK_RAW == sock->type) {
            inet->num = protocol;
            if (IPPROTO_RAW == protocol)
                  inet->hdrincl = 1;
      }

      sk->sk_destruct         = inet_sock_destruct;
      sk->sk_family           = PF_INET6;
      sk->sk_protocol         = protocol;

      sk->sk_backlog_rcv      = answer->prot->backlog_rcv;

      inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
      np->hop_limit     = -1;
      np->mcast_hops    = -1;
      np->mc_loop = 1;
      np->pmtudisc      = IPV6_PMTUDISC_WANT;
      np->ipv6only      = sysctl_ipv6_bindv6only;

      /* Init the ipv4 part of the socket since we can have sockets
       * using v6 API for ipv4.
       */
      inet->uc_ttl      = -1;

      inet->mc_loop     = 1;
      inet->mc_ttl      = 1;
      inet->mc_index    = 0;
      inet->mc_list     = NULL;

      if (ipv4_config.no_pmtu_disc)
            inet->pmtudisc = IP_PMTUDISC_DONT;
      else
            inet->pmtudisc = IP_PMTUDISC_WANT;
      /*
       * Increment only the relevant sk_prot->socks debug field, this changes
       * the previous behaviour of incrementing both the equivalent to
       * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
       *
       * This allows better debug granularity as we'll know exactly how many
       * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
       * transport protocol socks. -acme
       */
      sk_refcnt_debug_inc(sk);

      if (inet->num) {
            /* It assumes that any protocol which allows
             * the user to assign a number at socket
             * creation time automatically shares.
             */
            inet->sport = htons(inet->num);
            sk->sk_prot->hash(sk);
      }
      if (sk->sk_prot->init) {
            err = sk->sk_prot->init(sk);
            if (err) {
                  sk_common_release(sk);
                  goto out;
            }
      }
out:
      return err;
out_rcu_unlock:
      rcu_read_unlock();
      goto out;
}


/* bind for INET6 API */
int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
      struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
      struct sock *sk = sock->sk;
      struct inet_sock *inet = inet_sk(sk);
      struct ipv6_pinfo *np = inet6_sk(sk);
      __be32 v4addr = 0;
      unsigned short snum;
      int addr_type = 0;
      int err = 0;

      /* If the socket has its own bind function then use it. */
      if (sk->sk_prot->bind)
            return sk->sk_prot->bind(sk, uaddr, addr_len);

      if (addr_len < SIN6_LEN_RFC2133)
            return -EINVAL;
      addr_type = ipv6_addr_type(&addr->sin6_addr);
      if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
            return -EINVAL;

      snum = ntohs(addr->sin6_port);
      if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
            return -EACCES;

      lock_sock(sk);

      /* Check these errors (active socket, double bind). */
      if (sk->sk_state != TCP_CLOSE || inet->num) {
            err = -EINVAL;
            goto out;
      }

      /* Check if the address belongs to the host. */
      if (addr_type == IPV6_ADDR_MAPPED) {
            v4addr = addr->sin6_addr.s6_addr32[3];
            if (inet_addr_type(v4addr) != RTN_LOCAL) {
                  err = -EADDRNOTAVAIL;
                  goto out;
            }
      } else {
            if (addr_type != IPV6_ADDR_ANY) {
                  struct net_device *dev = NULL;

                  if (addr_type & IPV6_ADDR_LINKLOCAL) {
                        if (addr_len >= sizeof(struct sockaddr_in6) &&
                            addr->sin6_scope_id) {
                              /* Override any existing binding, if another one
                               * is supplied by user.
                               */
                              sk->sk_bound_dev_if = addr->sin6_scope_id;
                        }

                        /* Binding to link-local address requires an interface */
                        if (!sk->sk_bound_dev_if) {
                              err = -EINVAL;
                              goto out;
                        }
                        dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
                        if (!dev) {
                              err = -ENODEV;
                              goto out;
                        }
                  }

                  /* ipv4 addr of the socket is invalid.  Only the
                   * unspecified and mapped address have a v4 equivalent.
                   */
                  v4addr = LOOPBACK4_IPV6;
                  if (!(addr_type & IPV6_ADDR_MULTICAST))   {
                        if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
                              if (dev)
                                    dev_put(dev);
                              err = -EADDRNOTAVAIL;
                              goto out;
                        }
                  }
                  if (dev)
                        dev_put(dev);
            }
      }

      inet->rcv_saddr = v4addr;
      inet->saddr = v4addr;

      ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);

      if (!(addr_type & IPV6_ADDR_MULTICAST))
            ipv6_addr_copy(&np->saddr, &addr->sin6_addr);

      /* Make sure we are allowed to bind here. */
      if (sk->sk_prot->get_port(sk, snum)) {
            inet_reset_saddr(sk);
            err = -EADDRINUSE;
            goto out;
      }

      if (addr_type != IPV6_ADDR_ANY)
            sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
      if (snum)
            sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
      inet->sport = htons(inet->num);
      inet->dport = 0;
      inet->daddr = 0;
out:
      release_sock(sk);
      return err;
}

EXPORT_SYMBOL(inet6_bind);

int inet6_release(struct socket *sock)
{
      struct sock *sk = sock->sk;

      if (sk == NULL)
            return -EINVAL;

      /* Free mc lists */
      ipv6_sock_mc_close(sk);

      /* Free ac lists */
      ipv6_sock_ac_close(sk);

      return inet_release(sock);
}

EXPORT_SYMBOL(inet6_release);

int inet6_destroy_sock(struct sock *sk)
{
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct sk_buff *skb;
      struct ipv6_txoptions *opt;

      /* Release rx options */

      if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
            kfree_skb(skb);

      /* Free flowlabels */
      fl6_free_socklist(sk);

      /* Free tx options */

      if ((opt = xchg(&np->opt, NULL)) != NULL)
            sock_kfree_s(sk, opt, opt->tot_len);

      return 0;
}

EXPORT_SYMBOL_GPL(inet6_destroy_sock);

/*
 *    This does both peername and sockname.
 */

int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
             int *uaddr_len, int peer)
{
      struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
      struct sock *sk = sock->sk;
      struct inet_sock *inet = inet_sk(sk);
      struct ipv6_pinfo *np = inet6_sk(sk);

      sin->sin6_family = AF_INET6;
      sin->sin6_flowinfo = 0;
      sin->sin6_scope_id = 0;
      if (peer) {
            if (!inet->dport)
                  return -ENOTCONN;
            if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
                peer == 1)
                  return -ENOTCONN;
            sin->sin6_port = inet->dport;
            ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
            if (np->sndflow)
                  sin->sin6_flowinfo = np->flow_label;
      } else {
            if (ipv6_addr_any(&np->rcv_saddr))
                  ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
            else
                  ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);

            sin->sin6_port = inet->sport;
      }
      if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
            sin->sin6_scope_id = sk->sk_bound_dev_if;
      *uaddr_len = sizeof(*sin);
      return(0);
}

EXPORT_SYMBOL(inet6_getname);

int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
      struct sock *sk = sock->sk;

      switch(cmd)
      {
      case SIOCGSTAMP:
            return sock_get_timestamp(sk, (struct timeval __user *)arg);

      case SIOCGSTAMPNS:
            return sock_get_timestampns(sk, (struct timespec __user *)arg);

      case SIOCADDRT:
      case SIOCDELRT:

            return(ipv6_route_ioctl(cmd,(void __user *)arg));

      case SIOCSIFADDR:
            return addrconf_add_ifaddr((void __user *) arg);
      case SIOCDIFADDR:
            return addrconf_del_ifaddr((void __user *) arg);
      case SIOCSIFDSTADDR:
            return addrconf_set_dstaddr((void __user *) arg);
      default:
            if (!sk->sk_prot->ioctl)
                  return -ENOIOCTLCMD;
            return sk->sk_prot->ioctl(sk, cmd, arg);
      }
      /*NOTREACHED*/
      return(0);
}

EXPORT_SYMBOL(inet6_ioctl);

const struct proto_ops inet6_stream_ops = {
      .family              = PF_INET6,
      .owner               = THIS_MODULE,
      .release       = inet6_release,
      .bind          = inet6_bind,
      .connect       = inet_stream_connect,     /* ok       */
      .socketpair    = sock_no_socketpair,      /* a do nothing   */
      .accept              = inet_accept,       /* ok       */
      .getname       = inet6_getname,
      .poll          = tcp_poll,                /* ok       */
      .ioctl               = inet6_ioctl,       /* must change  */
      .listen              = inet_listen,       /* ok       */
      .shutdown      = inet_shutdown,           /* ok       */
      .setsockopt    = sock_common_setsockopt,  /* ok       */
      .getsockopt    = sock_common_getsockopt,  /* ok       */
      .sendmsg       = tcp_sendmsg,       /* ok       */
      .recvmsg       = sock_common_recvmsg,     /* ok       */
      .mmap          = sock_no_mmap,
      .sendpage      = tcp_sendpage,
#ifdef CONFIG_COMPAT
      .compat_setsockopt = compat_sock_common_setsockopt,
      .compat_getsockopt = compat_sock_common_getsockopt,
#endif
};

const struct proto_ops inet6_dgram_ops = {
      .family              = PF_INET6,
      .owner               = THIS_MODULE,
      .release       = inet6_release,
      .bind          = inet6_bind,
      .connect       = inet_dgram_connect,      /* ok       */
      .socketpair    = sock_no_socketpair,      /* a do nothing   */
      .accept              = sock_no_accept,          /* a do nothing   */
      .getname       = inet6_getname,
      .poll          = udp_poll,                /* ok       */
      .ioctl               = inet6_ioctl,       /* must change  */
      .listen              = sock_no_listen,          /* ok       */
      .shutdown      = inet_shutdown,           /* ok       */
      .setsockopt    = sock_common_setsockopt,  /* ok       */
      .getsockopt    = sock_common_getsockopt,  /* ok       */
      .sendmsg       = inet_sendmsg,            /* ok       */
      .recvmsg       = sock_common_recvmsg,     /* ok       */
      .mmap          = sock_no_mmap,
      .sendpage      = sock_no_sendpage,
#ifdef CONFIG_COMPAT
      .compat_setsockopt = compat_sock_common_setsockopt,
      .compat_getsockopt = compat_sock_common_getsockopt,
#endif
};

static struct net_proto_family inet6_family_ops = {
      .family = PF_INET6,
      .create = inet6_create,
      .owner      = THIS_MODULE,
};

/* Same as inet6_dgram_ops, sans udp_poll.  */
static const struct proto_ops inet6_sockraw_ops = {
      .family              = PF_INET6,
      .owner               = THIS_MODULE,
      .release       = inet6_release,
      .bind          = inet6_bind,
      .connect       = inet_dgram_connect,      /* ok       */
      .socketpair    = sock_no_socketpair,      /* a do nothing   */
      .accept              = sock_no_accept,          /* a do nothing   */
      .getname       = inet6_getname,
      .poll          = datagram_poll,           /* ok       */
      .ioctl               = inet6_ioctl,       /* must change  */
      .listen              = sock_no_listen,          /* ok       */
      .shutdown      = inet_shutdown,           /* ok       */
      .setsockopt    = sock_common_setsockopt,  /* ok       */
      .getsockopt    = sock_common_getsockopt,  /* ok       */
      .sendmsg       = inet_sendmsg,            /* ok       */
      .recvmsg       = sock_common_recvmsg,     /* ok       */
      .mmap          = sock_no_mmap,
      .sendpage      = sock_no_sendpage,
#ifdef CONFIG_COMPAT
      .compat_setsockopt = compat_sock_common_setsockopt,
      .compat_getsockopt = compat_sock_common_getsockopt,
#endif
};

static struct inet_protosw rawv6_protosw = {
      .type       = SOCK_RAW,
      .protocol   = IPPROTO_IP,     /* wild card */
      .prot       = &rawv6_prot,
      .ops        = &inet6_sockraw_ops,
      .capability = CAP_NET_RAW,
      .no_check   = UDP_CSUM_DEFAULT,
      .flags            = INET_PROTOSW_REUSE,
};

void
inet6_register_protosw(struct inet_protosw *p)
{
      struct list_head *lh;
      struct inet_protosw *answer;
      int protocol = p->protocol;
      struct list_head *last_perm;

      spin_lock_bh(&inetsw6_lock);

      if (p->type >= SOCK_MAX)
            goto out_illegal;

      /* If we are trying to override a permanent protocol, bail. */
      answer = NULL;
      last_perm = &inetsw6[p->type];
      list_for_each(lh, &inetsw6[p->type]) {
            answer = list_entry(lh, struct inet_protosw, list);

            /* Check only the non-wild match. */
            if (INET_PROTOSW_PERMANENT & answer->flags) {
                  if (protocol == answer->protocol)
                        break;
                  last_perm = lh;
            }

            answer = NULL;
      }
      if (answer)
            goto out_permanent;

      /* Add the new entry after the last permanent entry if any, so that
       * the new entry does not override a permanent entry when matched with
       * a wild-card protocol. But it is allowed to override any existing
       * non-permanent entry.  This means that when we remove this entry, the
       * system automatically returns to the old behavior.
       */
      list_add_rcu(&p->list, last_perm);
out:
      spin_unlock_bh(&inetsw6_lock);
      return;

out_permanent:
      printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
             protocol);
      goto out;

out_illegal:
      printk(KERN_ERR
             "Ignoring attempt to register invalid socket type %d.\n",
             p->type);
      goto out;
}

EXPORT_SYMBOL(inet6_register_protosw);

void
inet6_unregister_protosw(struct inet_protosw *p)
{
      if (INET_PROTOSW_PERMANENT & p->flags) {
            printk(KERN_ERR
                   "Attempt to unregister permanent protocol %d.\n",
                   p->protocol);
      } else {
            spin_lock_bh(&inetsw6_lock);
            list_del_rcu(&p->list);
            spin_unlock_bh(&inetsw6_lock);

            synchronize_net();
      }
}

EXPORT_SYMBOL(inet6_unregister_protosw);

int inet6_sk_rebuild_header(struct sock *sk)
{
      int err;
      struct dst_entry *dst;
      struct ipv6_pinfo *np = inet6_sk(sk);

      dst = __sk_dst_check(sk, np->dst_cookie);

      if (dst == NULL) {
            struct inet_sock *inet = inet_sk(sk);
            struct in6_addr *final_p = NULL, final;
            struct flowi fl;

            memset(&fl, 0, sizeof(fl));
            fl.proto = sk->sk_protocol;
            ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
            ipv6_addr_copy(&fl.fl6_src, &np->saddr);
            fl.fl6_flowlabel = np->flow_label;
            fl.oif = sk->sk_bound_dev_if;
            fl.fl_ip_dport = inet->dport;
            fl.fl_ip_sport = inet->sport;
            security_sk_classify_flow(sk, &fl);

            if (np->opt && np->opt->srcrt) {
                  struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
                  ipv6_addr_copy(&final, &fl.fl6_dst);
                  ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
                  final_p = &final;
            }

            err = ip6_dst_lookup(sk, &dst, &fl);
            if (err) {
                  sk->sk_route_caps = 0;
                  return err;
            }
            if (final_p)
                  ipv6_addr_copy(&fl.fl6_dst, final_p);

            if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
                  sk->sk_err_soft = -err;
                  return err;
            }

            __ip6_dst_store(sk, dst, NULL, NULL);
      }

      return 0;
}

EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);

int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
{
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct inet6_skb_parm *opt = IP6CB(skb);

      if (np->rxopt.all) {
            if ((opt->hop && (np->rxopt.bits.hopopts ||
                          np->rxopt.bits.ohopopts)) ||
                ((IPV6_FLOWINFO_MASK &
                  *(__be32 *)skb_network_header(skb)) &&
                 np->rxopt.bits.rxflow) ||
                (opt->srcrt && (np->rxopt.bits.srcrt ||
                 np->rxopt.bits.osrcrt)) ||
                ((opt->dst1 || opt->dst0) &&
                 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
                  return 1;
      }
      return 0;
}

EXPORT_SYMBOL_GPL(ipv6_opt_accepted);

static int __init init_ipv6_mibs(void)
{
      if (snmp_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
                    __alignof__(struct ipstats_mib)) < 0)
            goto err_ip_mib;
      if (snmp_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
                    __alignof__(struct icmpv6_mib)) < 0)
            goto err_icmp_mib;
      if (snmp_mib_init((void **)icmpv6msg_statistics,
          sizeof (struct icmpv6msg_mib), __alignof__(struct icmpv6_mib)) < 0)
            goto err_icmpmsg_mib;
      if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
                    __alignof__(struct udp_mib)) < 0)
            goto err_udp_mib;
      if (snmp_mib_init((void **)udplite_stats_in6, sizeof (struct udp_mib),
                    __alignof__(struct udp_mib)) < 0)
            goto err_udplite_mib;
      return 0;

err_udplite_mib:
      snmp_mib_free((void **)udp_stats_in6);
err_udp_mib:
      snmp_mib_free((void **)icmpv6msg_statistics);
err_icmpmsg_mib:
      snmp_mib_free((void **)icmpv6_statistics);
err_icmp_mib:
      snmp_mib_free((void **)ipv6_statistics);
err_ip_mib:
      return -ENOMEM;

}

static void cleanup_ipv6_mibs(void)
{
      snmp_mib_free((void **)ipv6_statistics);
      snmp_mib_free((void **)icmpv6_statistics);
      snmp_mib_free((void **)icmpv6msg_statistics);
      snmp_mib_free((void **)udp_stats_in6);
      snmp_mib_free((void **)udplite_stats_in6);
}

static int __init inet6_init(void)
{
      struct sk_buff *dummy_skb;
      struct list_head *r;
      int err;

      BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));

#ifdef MODULE
#if 0 /* FIXME --RR */
      if (!mod_member_present(&__this_module, can_unload))
        return -EINVAL;

      __this_module.can_unload = &ipv6_unload;
#endif
#endif

      err = proto_register(&tcpv6_prot, 1);
      if (err)
            goto out;

      err = proto_register(&udpv6_prot, 1);
      if (err)
            goto out_unregister_tcp_proto;

      err = proto_register(&udplitev6_prot, 1);
      if (err)
            goto out_unregister_udp_proto;

      err = proto_register(&rawv6_prot, 1);
      if (err)
            goto out_unregister_udplite_proto;


      /* Register the socket-side information for inet6_create.  */
      for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
            INIT_LIST_HEAD(r);

      /* We MUST register RAW sockets before we create the ICMP6,
       * IGMP6, or NDISC control sockets.
       */
      inet6_register_protosw(&rawv6_protosw);

      /* Register the family here so that the init calls below will
       * be able to create sockets. (?? is this dangerous ??)
       */
      err = sock_register(&inet6_family_ops);
      if (err)
            goto out_unregister_raw_proto;

      /* Initialise ipv6 mibs */
      err = init_ipv6_mibs();
      if (err)
            goto out_unregister_sock;

      /*
       *    ipngwg API draft makes clear that the correct semantics
       *    for TCP and UDP is to consider one TCP and UDP instance
       *    in a host availiable by both INET and INET6 APIs and
       *    able to communicate via both network protocols.
       */

#ifdef CONFIG_SYSCTL
      ipv6_sysctl_register();
#endif
      err = icmpv6_init(&inet6_family_ops);
      if (err)
            goto icmp_fail;
      err = ndisc_init(&inet6_family_ops);
      if (err)
            goto ndisc_fail;
      err = igmp6_init(&inet6_family_ops);
      if (err)
            goto igmp_fail;
      err = ipv6_netfilter_init();
      if (err)
            goto netfilter_fail;
      /* Create /proc/foo6 entries. */
#ifdef CONFIG_PROC_FS
      err = -ENOMEM;
      if (raw6_proc_init())
            goto proc_raw6_fail;
      if (tcp6_proc_init())
            goto proc_tcp6_fail;
      if (udp6_proc_init())
            goto proc_udp6_fail;
      if (udplite6_proc_init())
            goto proc_udplite6_fail;
      if (ipv6_misc_proc_init())
            goto proc_misc6_fail;

      if (ac6_proc_init())
            goto proc_anycast6_fail;
      if (if6_proc_init())
            goto proc_if6_fail;
#endif
      ip6_route_init();
      ip6_flowlabel_init();
      err = addrconf_init();
      if (err)
            goto addrconf_fail;

      /* Init v6 extension headers. */
      ipv6_rthdr_init();
      ipv6_frag_init();
      ipv6_nodata_init();
      ipv6_destopt_init();

      /* Init v6 transport protocols. */
      udpv6_init();
      udplitev6_init();
      tcpv6_init();

      ipv6_packet_init();
      err = 0;
out:
      return err;

addrconf_fail:
      ip6_flowlabel_cleanup();
      ip6_route_cleanup();
#ifdef CONFIG_PROC_FS
      if6_proc_exit();
proc_if6_fail:
      ac6_proc_exit();
proc_anycast6_fail:
      ipv6_misc_proc_exit();
proc_misc6_fail:
      udplite6_proc_exit();
proc_udplite6_fail:
      udp6_proc_exit();
proc_udp6_fail:
      tcp6_proc_exit();
proc_tcp6_fail:
      raw6_proc_exit();
proc_raw6_fail:
#endif
      ipv6_netfilter_fini();
netfilter_fail:
      igmp6_cleanup();
igmp_fail:
      ndisc_cleanup();
ndisc_fail:
      icmpv6_cleanup();
icmp_fail:
#ifdef CONFIG_SYSCTL
      ipv6_sysctl_unregister();
#endif
      cleanup_ipv6_mibs();
out_unregister_sock:
      sock_unregister(PF_INET6);
out_unregister_raw_proto:
      proto_unregister(&rawv6_prot);
out_unregister_udplite_proto:
      proto_unregister(&udplitev6_prot);
out_unregister_udp_proto:
      proto_unregister(&udpv6_prot);
out_unregister_tcp_proto:
      proto_unregister(&tcpv6_prot);
      goto out;
}
module_init(inet6_init);

static void __exit inet6_exit(void)
{
      /* First of all disallow new sockets creation. */
      sock_unregister(PF_INET6);
      /* Disallow any further netlink messages */
      rtnl_unregister_all(PF_INET6);

      /* Cleanup code parts. */
      ipv6_packet_cleanup();

      addrconf_cleanup();
      ip6_flowlabel_cleanup();
      ip6_route_cleanup();
#ifdef CONFIG_PROC_FS

      /* Cleanup code parts. */
      if6_proc_exit();
      ac6_proc_exit();
      ipv6_misc_proc_exit();
      udplite6_proc_exit();
      udp6_proc_exit();
      tcp6_proc_exit();
      raw6_proc_exit();
#endif
      ipv6_netfilter_fini();
      igmp6_cleanup();
      ndisc_cleanup();
      icmpv6_cleanup();
#ifdef CONFIG_SYSCTL
      ipv6_sysctl_unregister();
#endif
      cleanup_ipv6_mibs();
      proto_unregister(&rawv6_prot);
      proto_unregister(&udplitev6_prot);
      proto_unregister(&udpv6_prot);
      proto_unregister(&tcpv6_prot);
}
module_exit(inet6_exit);

MODULE_ALIAS_NETPROTO(PF_INET6);

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