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ipv6_sockglue.c

/*
 *    IPv6 BSD socket options interface
 *    Linux INET6 implementation
 *
 *    Authors:
 *    Pedro Roque       <roque@di.fc.ul.pt>
 *
 *    Based on linux/net/ipv4/ip_sockglue.c
 *
 *    $Id: ipv6_sockglue.c,v 1.41 2002/02/01 22:01:04 davem Exp $
 *
 *    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.
 *
 *    FIXME: Make the setsockopt code POSIX compliant: That is
 *
 *    o     Return -EINVAL for setsockopt of short lengths
 *    o     Truncate getsockopt returns
 *    o     Return an optlen of the truncated length if need be
 *
 *    Changes:
 *    David L Stevens <dlstevens@us.ibm.com>:
 *          - added multicast source filtering API for MLDv2
 */

#include <linux/module.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/sysctl.h>
#include <linux/netfilter.h>

#include <net/sock.h>
#include <net/snmp.h>
#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/inet_common.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <net/udplite.h>
#include <net/xfrm.h>

#include <asm/uaccess.h>

DEFINE_SNMP_STAT(struct ipstats_mib, ipv6_statistics) __read_mostly;

static struct inet6_protocol *ipv6_gso_pull_exthdrs(struct sk_buff *skb,
                                        int proto)
{
      struct inet6_protocol *ops = NULL;

      for (;;) {
            struct ipv6_opt_hdr *opth;
            int len;

            if (proto != NEXTHDR_HOP) {
                  ops = rcu_dereference(inet6_protos[proto]);

                  if (unlikely(!ops))
                        break;

                  if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
                        break;
            }

            if (unlikely(!pskb_may_pull(skb, 8)))
                  break;

            opth = (void *)skb->data;
            len = opth->hdrlen * 8 + 8;

            if (unlikely(!pskb_may_pull(skb, len)))
                  break;

            proto = opth->nexthdr;
            __skb_pull(skb, len);
      }

      return ops;
}

static int ipv6_gso_send_check(struct sk_buff *skb)
{
      struct ipv6hdr *ipv6h;
      struct inet6_protocol *ops;
      int err = -EINVAL;

      if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
            goto out;

      ipv6h = ipv6_hdr(skb);
      __skb_pull(skb, sizeof(*ipv6h));
      err = -EPROTONOSUPPORT;

      rcu_read_lock();
      ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
      if (likely(ops && ops->gso_send_check)) {
            skb_reset_transport_header(skb);
            err = ops->gso_send_check(skb);
      }
      rcu_read_unlock();

out:
      return err;
}

static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
{
      struct sk_buff *segs = ERR_PTR(-EINVAL);
      struct ipv6hdr *ipv6h;
      struct inet6_protocol *ops;

      if (!(features & NETIF_F_V6_CSUM))
            features &= ~NETIF_F_SG;

      if (unlikely(skb_shinfo(skb)->gso_type &
                 ~(SKB_GSO_UDP |
                   SKB_GSO_DODGY |
                   SKB_GSO_TCP_ECN |
                   SKB_GSO_TCPV6 |
                   0)))
            goto out;

      if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
            goto out;

      ipv6h = ipv6_hdr(skb);
      __skb_pull(skb, sizeof(*ipv6h));
      segs = ERR_PTR(-EPROTONOSUPPORT);

      rcu_read_lock();
      ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
      if (likely(ops && ops->gso_segment)) {
            skb_reset_transport_header(skb);
            segs = ops->gso_segment(skb, features);
      }
      rcu_read_unlock();

      if (unlikely(IS_ERR(segs)))
            goto out;

      for (skb = segs; skb; skb = skb->next) {
            ipv6h = ipv6_hdr(skb);
            ipv6h->payload_len = htons(skb->len - skb->mac_len -
                                 sizeof(*ipv6h));
      }

out:
      return segs;
}

static struct packet_type ipv6_packet_type = {
      .type = __constant_htons(ETH_P_IPV6),
      .func = ipv6_rcv,
      .gso_send_check = ipv6_gso_send_check,
      .gso_segment = ipv6_gso_segment,
};

struct ip6_ra_chain *ip6_ra_chain;
DEFINE_RWLOCK(ip6_ra_lock);

int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
{
      struct ip6_ra_chain *ra, *new_ra, **rap;

      /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
      if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num != IPPROTO_RAW)
            return -EINVAL;

      new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;

      write_lock_bh(&ip6_ra_lock);
      for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
            if (ra->sk == sk) {
                  if (sel>=0) {
                        write_unlock_bh(&ip6_ra_lock);
                        kfree(new_ra);
                        return -EADDRINUSE;
                  }

                  *rap = ra->next;
                  write_unlock_bh(&ip6_ra_lock);

                  if (ra->destructor)
                        ra->destructor(sk);
                  sock_put(sk);
                  kfree(ra);
                  return 0;
            }
      }
      if (new_ra == NULL) {
            write_unlock_bh(&ip6_ra_lock);
            return -ENOBUFS;
      }
      new_ra->sk = sk;
      new_ra->sel = sel;
      new_ra->destructor = destructor;
      new_ra->next = ra;
      *rap = new_ra;
      sock_hold(sk);
      write_unlock_bh(&ip6_ra_lock);
      return 0;
}

static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
                char __user *optval, int optlen)
{
      struct ipv6_pinfo *np = inet6_sk(sk);
      int val, valbool;
      int retv = -ENOPROTOOPT;

      if (optval == NULL)
            val=0;
      else if (get_user(val, (int __user *) optval))
            return -EFAULT;

      valbool = (val!=0);

      lock_sock(sk);

      switch (optname) {

      case IPV6_ADDRFORM:
            if (val == PF_INET) {
                  struct ipv6_txoptions *opt;
                  struct sk_buff *pktopt;

                  if (sk->sk_protocol != IPPROTO_UDP &&
                      sk->sk_protocol != IPPROTO_UDPLITE &&
                      sk->sk_protocol != IPPROTO_TCP)
                        break;

                  if (sk->sk_state != TCP_ESTABLISHED) {
                        retv = -ENOTCONN;
                        break;
                  }

                  if (ipv6_only_sock(sk) ||
                      !ipv6_addr_v4mapped(&np->daddr)) {
                        retv = -EADDRNOTAVAIL;
                        break;
                  }

                  fl6_free_socklist(sk);
                  ipv6_sock_mc_close(sk);

                  /*
                   * Sock is moving from IPv6 to IPv4 (sk_prot), so
                   * remove it from the refcnt debug socks count in the
                   * original family...
                   */
                  sk_refcnt_debug_dec(sk);

                  if (sk->sk_protocol == IPPROTO_TCP) {
                        struct inet_connection_sock *icsk = inet_csk(sk);

                        local_bh_disable();
                        sock_prot_dec_use(sk->sk_prot);
                        sock_prot_inc_use(&tcp_prot);
                        local_bh_enable();
                        sk->sk_prot = &tcp_prot;
                        icsk->icsk_af_ops = &ipv4_specific;
                        sk->sk_socket->ops = &inet_stream_ops;
                        sk->sk_family = PF_INET;
                        tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
                  } else {
                        struct proto *prot = &udp_prot;

                        if (sk->sk_protocol == IPPROTO_UDPLITE)
                              prot = &udplite_prot;
                        local_bh_disable();
                        sock_prot_dec_use(sk->sk_prot);
                        sock_prot_inc_use(prot);
                        local_bh_enable();
                        sk->sk_prot = prot;
                        sk->sk_socket->ops = &inet_dgram_ops;
                        sk->sk_family = PF_INET;
                  }
                  opt = xchg(&np->opt, NULL);
                  if (opt)
                        sock_kfree_s(sk, opt, opt->tot_len);
                  pktopt = xchg(&np->pktoptions, NULL);
                  if (pktopt)
                        kfree_skb(pktopt);

                  sk->sk_destruct = inet_sock_destruct;
                  /*
                   * ... and add it to the refcnt debug socks count
                   * in the new family. -acme
                   */
                  sk_refcnt_debug_inc(sk);
                  module_put(THIS_MODULE);
                  retv = 0;
                  break;
            }
            goto e_inval;

      case IPV6_V6ONLY:
            if (inet_sk(sk)->num)
                  goto e_inval;
            np->ipv6only = valbool;
            retv = 0;
            break;

      case IPV6_RECVPKTINFO:
            np->rxopt.bits.rxinfo = valbool;
            retv = 0;
            break;

      case IPV6_2292PKTINFO:
            np->rxopt.bits.rxoinfo = valbool;
            retv = 0;
            break;

      case IPV6_RECVHOPLIMIT:
            np->rxopt.bits.rxhlim = valbool;
            retv = 0;
            break;

      case IPV6_2292HOPLIMIT:
            np->rxopt.bits.rxohlim = valbool;
            retv = 0;
            break;

      case IPV6_RECVRTHDR:
            np->rxopt.bits.srcrt = valbool;
            retv = 0;
            break;

      case IPV6_2292RTHDR:
            np->rxopt.bits.osrcrt = valbool;
            retv = 0;
            break;

      case IPV6_RECVHOPOPTS:
            np->rxopt.bits.hopopts = valbool;
            retv = 0;
            break;

      case IPV6_2292HOPOPTS:
            np->rxopt.bits.ohopopts = valbool;
            retv = 0;
            break;

      case IPV6_RECVDSTOPTS:
            np->rxopt.bits.dstopts = valbool;
            retv = 0;
            break;

      case IPV6_2292DSTOPTS:
            np->rxopt.bits.odstopts = valbool;
            retv = 0;
            break;

      case IPV6_TCLASS:
            if (val < -1 || val > 0xff)
                  goto e_inval;
            np->tclass = val;
            retv = 0;
            break;

      case IPV6_RECVTCLASS:
            np->rxopt.bits.rxtclass = valbool;
            retv = 0;
            break;

      case IPV6_FLOWINFO:
            np->rxopt.bits.rxflow = valbool;
            retv = 0;
            break;

      case IPV6_HOPOPTS:
      case IPV6_RTHDRDSTOPTS:
      case IPV6_RTHDR:
      case IPV6_DSTOPTS:
      {
            struct ipv6_txoptions *opt;
            if (optlen == 0)
                  optval = NULL;

            /* hop-by-hop / destination options are privileged option */
            retv = -EPERM;
            if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW))
                  break;

            retv = -EINVAL;
            if (optlen & 0x7 || optlen > 8 * 255)
                  break;

            opt = ipv6_renew_options(sk, np->opt, optname,
                               (struct ipv6_opt_hdr __user *)optval,
                               optlen);
            if (IS_ERR(opt)) {
                  retv = PTR_ERR(opt);
                  break;
            }

            /* routing header option needs extra check */
            if (optname == IPV6_RTHDR && opt && opt->srcrt) {
                  struct ipv6_rt_hdr *rthdr = opt->srcrt;
                  switch (rthdr->type) {
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
                  case IPV6_SRCRT_TYPE_2:
                        break;
#endif
                  default:
                        goto sticky_done;
                  }

                  if ((rthdr->hdrlen & 1) ||
                      (rthdr->hdrlen >> 1) != rthdr->segments_left)
                        goto sticky_done;
            }

            retv = 0;
            if (inet_sk(sk)->is_icsk) {
                  if (opt) {
                        struct inet_connection_sock *icsk = inet_csk(sk);
                        if (!((1 << sk->sk_state) &
                              (TCPF_LISTEN | TCPF_CLOSE))
                            && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
                              icsk->icsk_ext_hdr_len =
                                    opt->opt_flen + opt->opt_nflen;
                              icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
                        }
                  }
                  opt = xchg(&np->opt, opt);
                  sk_dst_reset(sk);
            } else {
                  write_lock(&sk->sk_dst_lock);
                  opt = xchg(&np->opt, opt);
                  write_unlock(&sk->sk_dst_lock);
                  sk_dst_reset(sk);
            }
sticky_done:
            if (opt)
                  sock_kfree_s(sk, opt, opt->tot_len);
            break;
      }

      case IPV6_2292PKTOPTIONS:
      {
            struct ipv6_txoptions *opt = NULL;
            struct msghdr msg;
            struct flowi fl;
            int junk;

            fl.fl6_flowlabel = 0;
            fl.oif = sk->sk_bound_dev_if;

            if (optlen == 0)
                  goto update;

            /* 1K is probably excessive
             * 1K is surely not enough, 2K per standard header is 16K.
             */
            retv = -EINVAL;
            if (optlen > 64*1024)
                  break;

            opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
            retv = -ENOBUFS;
            if (opt == NULL)
                  break;

            memset(opt, 0, sizeof(*opt));
            opt->tot_len = sizeof(*opt) + optlen;
            retv = -EFAULT;
            if (copy_from_user(opt+1, optval, optlen))
                  goto done;

            msg.msg_controllen = optlen;
            msg.msg_control = (void*)(opt+1);

            retv = datagram_send_ctl(&msg, &fl, opt, &junk, &junk);
            if (retv)
                  goto done;
update:
            retv = 0;
            if (inet_sk(sk)->is_icsk) {
                  if (opt) {
                        struct inet_connection_sock *icsk = inet_csk(sk);
                        if (!((1 << sk->sk_state) &
                              (TCPF_LISTEN | TCPF_CLOSE))
                            && inet_sk(sk)->daddr != LOOPBACK4_IPV6) {
                              icsk->icsk_ext_hdr_len =
                                    opt->opt_flen + opt->opt_nflen;
                              icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
                        }
                  }
                  opt = xchg(&np->opt, opt);
                  sk_dst_reset(sk);
            } else {
                  write_lock(&sk->sk_dst_lock);
                  opt = xchg(&np->opt, opt);
                  write_unlock(&sk->sk_dst_lock);
                  sk_dst_reset(sk);
            }

done:
            if (opt)
                  sock_kfree_s(sk, opt, opt->tot_len);
            break;
      }
      case IPV6_UNICAST_HOPS:
            if (val > 255 || val < -1)
                  goto e_inval;
            np->hop_limit = val;
            retv = 0;
            break;

      case IPV6_MULTICAST_HOPS:
            if (sk->sk_type == SOCK_STREAM)
                  goto e_inval;
            if (val > 255 || val < -1)
                  goto e_inval;
            np->mcast_hops = val;
            retv = 0;
            break;

      case IPV6_MULTICAST_LOOP:
            np->mc_loop = valbool;
            retv = 0;
            break;

      case IPV6_MULTICAST_IF:
            if (sk->sk_type == SOCK_STREAM)
                  goto e_inval;

            if (val) {
                  if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != val)
                        goto e_inval;

                  if (__dev_get_by_index(&init_net, val) == NULL) {
                        retv = -ENODEV;
                        break;
                  }
            }
            np->mcast_oif = val;
            retv = 0;
            break;
      case IPV6_ADD_MEMBERSHIP:
      case IPV6_DROP_MEMBERSHIP:
      {
            struct ipv6_mreq mreq;

            retv = -EPROTO;
            if (inet_sk(sk)->is_icsk)
                  break;

            retv = -EFAULT;
            if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
                  break;

            if (optname == IPV6_ADD_MEMBERSHIP)
                  retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
            else
                  retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
            break;
      }
      case IPV6_JOIN_ANYCAST:
      case IPV6_LEAVE_ANYCAST:
      {
            struct ipv6_mreq mreq;

            if (optlen != sizeof(struct ipv6_mreq))
                  goto e_inval;

            retv = -EFAULT;
            if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
                  break;

            if (optname == IPV6_JOIN_ANYCAST)
                  retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
            else
                  retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
            break;
      }
      case MCAST_JOIN_GROUP:
      case MCAST_LEAVE_GROUP:
      {
            struct group_req greq;
            struct sockaddr_in6 *psin6;

            retv = -EFAULT;
            if (copy_from_user(&greq, optval, sizeof(struct group_req)))
                  break;
            if (greq.gr_group.ss_family != AF_INET6) {
                  retv = -EADDRNOTAVAIL;
                  break;
            }
            psin6 = (struct sockaddr_in6 *)&greq.gr_group;
            if (optname == MCAST_JOIN_GROUP)
                  retv = ipv6_sock_mc_join(sk, greq.gr_interface,
                        &psin6->sin6_addr);
            else
                  retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
                        &psin6->sin6_addr);
            break;
      }
      case MCAST_JOIN_SOURCE_GROUP:
      case MCAST_LEAVE_SOURCE_GROUP:
      case MCAST_BLOCK_SOURCE:
      case MCAST_UNBLOCK_SOURCE:
      {
            struct group_source_req greqs;
            int omode, add;

            if (optlen != sizeof(struct group_source_req))
                  goto e_inval;
            if (copy_from_user(&greqs, optval, sizeof(greqs))) {
                  retv = -EFAULT;
                  break;
            }
            if (greqs.gsr_group.ss_family != AF_INET6 ||
                greqs.gsr_source.ss_family != AF_INET6) {
                  retv = -EADDRNOTAVAIL;
                  break;
            }
            if (optname == MCAST_BLOCK_SOURCE) {
                  omode = MCAST_EXCLUDE;
                  add = 1;
            } else if (optname == MCAST_UNBLOCK_SOURCE) {
                  omode = MCAST_EXCLUDE;
                  add = 0;
            } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
                  struct sockaddr_in6 *psin6;

                  psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
                  retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
                        &psin6->sin6_addr);
                  /* prior join w/ different source is ok */
                  if (retv && retv != -EADDRINUSE)
                        break;
                  omode = MCAST_INCLUDE;
                  add = 1;
            } else /* MCAST_LEAVE_SOURCE_GROUP */ {
                  omode = MCAST_INCLUDE;
                  add = 0;
            }
            retv = ip6_mc_source(add, omode, sk, &greqs);
            break;
      }
      case MCAST_MSFILTER:
      {
            extern int sysctl_mld_max_msf;
            struct group_filter *gsf;

            if (optlen < GROUP_FILTER_SIZE(0))
                  goto e_inval;
            if (optlen > sysctl_optmem_max) {
                  retv = -ENOBUFS;
                  break;
            }
            gsf = kmalloc(optlen,GFP_KERNEL);
            if (!gsf) {
                  retv = -ENOBUFS;
                  break;
            }
            retv = -EFAULT;
            if (copy_from_user(gsf, optval, optlen)) {
                  kfree(gsf);
                  break;
            }
            /* numsrc >= (4G-140)/128 overflow in 32 bits */
            if (gsf->gf_numsrc >= 0x1ffffffU ||
                gsf->gf_numsrc > sysctl_mld_max_msf) {
                  kfree(gsf);
                  retv = -ENOBUFS;
                  break;
            }
            if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
                  kfree(gsf);
                  retv = -EINVAL;
                  break;
            }
            retv = ip6_mc_msfilter(sk, gsf);
            kfree(gsf);

            break;
      }
      case IPV6_ROUTER_ALERT:
            retv = ip6_ra_control(sk, val, NULL);
            break;
      case IPV6_MTU_DISCOVER:
            if (val<0 || val>3)
                  goto e_inval;
            np->pmtudisc = val;
            retv = 0;
            break;
      case IPV6_MTU:
            if (val && val < IPV6_MIN_MTU)
                  goto e_inval;
            np->frag_size = val;
            retv = 0;
            break;
      case IPV6_RECVERR:
            np->recverr = valbool;
            if (!val)
                  skb_queue_purge(&sk->sk_error_queue);
            retv = 0;
            break;
      case IPV6_FLOWINFO_SEND:
            np->sndflow = valbool;
            retv = 0;
            break;
      case IPV6_FLOWLABEL_MGR:
            retv = ipv6_flowlabel_opt(sk, optval, optlen);
            break;
      case IPV6_IPSEC_POLICY:
      case IPV6_XFRM_POLICY:
            retv = -EPERM;
            if (!capable(CAP_NET_ADMIN))
                  break;
            retv = xfrm_user_policy(sk, optname, optval, optlen);
            break;

      }
      release_sock(sk);

      return retv;

e_inval:
      release_sock(sk);
      return -EINVAL;
}

int ipv6_setsockopt(struct sock *sk, int level, int optname,
                char __user *optval, int optlen)
{
      int err;

      if (level == SOL_IP && sk->sk_type != SOCK_RAW)
            return udp_prot.setsockopt(sk, level, optname, optval, optlen);

      if (level != SOL_IPV6)
            return -ENOPROTOOPT;

      err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
      /* we need to exclude all possible ENOPROTOOPTs except default case */
      if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
                  optname != IPV6_XFRM_POLICY) {
            lock_sock(sk);
            err = nf_setsockopt(sk, PF_INET6, optname, optval,
                        optlen);
            release_sock(sk);
      }
#endif
      return err;
}

EXPORT_SYMBOL(ipv6_setsockopt);

#ifdef CONFIG_COMPAT
int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
                     char __user *optval, int optlen)
{
      int err;

      if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
            if (udp_prot.compat_setsockopt != NULL)
                  return udp_prot.compat_setsockopt(sk, level, optname,
                                            optval, optlen);
            return udp_prot.setsockopt(sk, level, optname, optval, optlen);
      }

      if (level != SOL_IPV6)
            return -ENOPROTOOPT;

      err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
      /* we need to exclude all possible ENOPROTOOPTs except default case */
      if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
          optname != IPV6_XFRM_POLICY) {
            lock_sock(sk);
            err = compat_nf_setsockopt(sk, PF_INET6, optname,
                                 optval, optlen);
            release_sock(sk);
      }
#endif
      return err;
}

EXPORT_SYMBOL(compat_ipv6_setsockopt);
#endif

static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
                          int optname, char __user *optval, int len)
{
      struct ipv6_opt_hdr *hdr;

      if (!opt)
            return 0;

      switch(optname) {
      case IPV6_HOPOPTS:
            hdr = opt->hopopt;
            break;
      case IPV6_RTHDRDSTOPTS:
            hdr = opt->dst0opt;
            break;
      case IPV6_RTHDR:
            hdr = (struct ipv6_opt_hdr *)opt->srcrt;
            break;
      case IPV6_DSTOPTS:
            hdr = opt->dst1opt;
            break;
      default:
            return -EINVAL;   /* should not happen */
      }

      if (!hdr)
            return 0;

      len = min_t(unsigned int, len, ipv6_optlen(hdr));
      if (copy_to_user(optval, hdr, len))
            return -EFAULT;
      return ipv6_optlen(hdr);
}

static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
                char __user *optval, int __user *optlen)
{
      struct ipv6_pinfo *np = inet6_sk(sk);
      int len;
      int val;

      if (get_user(len, optlen))
            return -EFAULT;
      switch (optname) {
      case IPV6_ADDRFORM:
            if (sk->sk_protocol != IPPROTO_UDP &&
                sk->sk_protocol != IPPROTO_UDPLITE &&
                sk->sk_protocol != IPPROTO_TCP)
                  return -EINVAL;
            if (sk->sk_state != TCP_ESTABLISHED)
                  return -ENOTCONN;
            val = sk->sk_family;
            break;
      case MCAST_MSFILTER:
      {
            struct group_filter gsf;
            int err;

            if (len < GROUP_FILTER_SIZE(0))
                  return -EINVAL;
            if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
                  return -EFAULT;
            lock_sock(sk);
            err = ip6_mc_msfget(sk, &gsf,
                  (struct group_filter __user *)optval, optlen);
            release_sock(sk);
            return err;
      }

      case IPV6_2292PKTOPTIONS:
      {
            struct msghdr msg;
            struct sk_buff *skb;

            if (sk->sk_type != SOCK_STREAM)
                  return -ENOPROTOOPT;

            msg.msg_control = optval;
            msg.msg_controllen = len;
            msg.msg_flags = 0;

            lock_sock(sk);
            skb = np->pktoptions;
            if (skb)
                  atomic_inc(&skb->users);
            release_sock(sk);

            if (skb) {
                  int err = datagram_recv_ctl(sk, &msg, skb);
                  kfree_skb(skb);
                  if (err)
                        return err;
            } else {
                  if (np->rxopt.bits.rxinfo) {
                        struct in6_pktinfo src_info;
                        src_info.ipi6_ifindex = np->mcast_oif;
                        ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
                        put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
                  }
                  if (np->rxopt.bits.rxhlim) {
                        int hlim = np->mcast_hops;
                        put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
                  }
                  if (np->rxopt.bits.rxoinfo) {
                        struct in6_pktinfo src_info;
                        src_info.ipi6_ifindex = np->mcast_oif;
                        ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
                        put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
                  }
                  if (np->rxopt.bits.rxohlim) {
                        int hlim = np->mcast_hops;
                        put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
                  }
            }
            len -= msg.msg_controllen;
            return put_user(len, optlen);
      }
      case IPV6_MTU:
      {
            struct dst_entry *dst;
            val = 0;
            lock_sock(sk);
            dst = sk_dst_get(sk);
            if (dst) {
                  val = dst_mtu(dst);
                  dst_release(dst);
            }
            release_sock(sk);
            if (!val)
                  return -ENOTCONN;
            break;
      }

      case IPV6_V6ONLY:
            val = np->ipv6only;
            break;

      case IPV6_RECVPKTINFO:
            val = np->rxopt.bits.rxinfo;
            break;

      case IPV6_2292PKTINFO:
            val = np->rxopt.bits.rxoinfo;
            break;

      case IPV6_RECVHOPLIMIT:
            val = np->rxopt.bits.rxhlim;
            break;

      case IPV6_2292HOPLIMIT:
            val = np->rxopt.bits.rxohlim;
            break;

      case IPV6_RECVRTHDR:
            val = np->rxopt.bits.srcrt;
            break;

      case IPV6_2292RTHDR:
            val = np->rxopt.bits.osrcrt;
            break;

      case IPV6_HOPOPTS:
      case IPV6_RTHDRDSTOPTS:
      case IPV6_RTHDR:
      case IPV6_DSTOPTS:
      {

            lock_sock(sk);
            len = ipv6_getsockopt_sticky(sk, np->opt,
                                   optname, optval, len);
            release_sock(sk);
            return put_user(len, optlen);
      }

      case IPV6_RECVHOPOPTS:
            val = np->rxopt.bits.hopopts;
            break;

      case IPV6_2292HOPOPTS:
            val = np->rxopt.bits.ohopopts;
            break;

      case IPV6_RECVDSTOPTS:
            val = np->rxopt.bits.dstopts;
            break;

      case IPV6_2292DSTOPTS:
            val = np->rxopt.bits.odstopts;
            break;

      case IPV6_TCLASS:
            val = np->tclass;
            if (val < 0)
                  val = 0;
            break;

      case IPV6_RECVTCLASS:
            val = np->rxopt.bits.rxtclass;
            break;

      case IPV6_FLOWINFO:
            val = np->rxopt.bits.rxflow;
            break;

      case IPV6_UNICAST_HOPS:
      case IPV6_MULTICAST_HOPS:
      {
            struct dst_entry *dst;

            if (optname == IPV6_UNICAST_HOPS)
                  val = np->hop_limit;
            else
                  val = np->mcast_hops;

            dst = sk_dst_get(sk);
            if (dst) {
                  if (val < 0)
                        val = dst_metric(dst, RTAX_HOPLIMIT);
                  if (val < 0)
                        val = ipv6_get_hoplimit(dst->dev);
                  dst_release(dst);
            }
            if (val < 0)
                  val = ipv6_devconf.hop_limit;
            break;
      }

      case IPV6_MULTICAST_LOOP:
            val = np->mc_loop;
            break;

      case IPV6_MULTICAST_IF:
            val = np->mcast_oif;
            break;

      case IPV6_MTU_DISCOVER:
            val = np->pmtudisc;
            break;

      case IPV6_RECVERR:
            val = np->recverr;
            break;

      case IPV6_FLOWINFO_SEND:
            val = np->sndflow;
            break;

      default:
            return -ENOPROTOOPT;
      }
      len = min_t(unsigned int, sizeof(int), len);
      if(put_user(len, optlen))
            return -EFAULT;
      if(copy_to_user(optval,&val,len))
            return -EFAULT;
      return 0;
}

int ipv6_getsockopt(struct sock *sk, int level, int optname,
                char __user *optval, int __user *optlen)
{
      int err;

      if (level == SOL_IP && sk->sk_type != SOCK_RAW)
            return udp_prot.getsockopt(sk, level, optname, optval, optlen);

      if(level != SOL_IPV6)
            return -ENOPROTOOPT;

      err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
      /* we need to exclude all possible ENOPROTOOPTs except default case */
      if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
            int len;

            if (get_user(len, optlen))
                  return -EFAULT;

            lock_sock(sk);
            err = nf_getsockopt(sk, PF_INET6, optname, optval,
                        &len);
            release_sock(sk);
            if (err >= 0)
                  err = put_user(len, optlen);
      }
#endif
      return err;
}

EXPORT_SYMBOL(ipv6_getsockopt);

#ifdef CONFIG_COMPAT
int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
                     char __user *optval, int __user *optlen)
{
      int err;

      if (level == SOL_IP && sk->sk_type != SOCK_RAW) {
            if (udp_prot.compat_getsockopt != NULL)
                  return udp_prot.compat_getsockopt(sk, level, optname,
                                            optval, optlen);
            return udp_prot.getsockopt(sk, level, optname, optval, optlen);
      }

      if (level != SOL_IPV6)
            return -ENOPROTOOPT;

      err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
      /* we need to exclude all possible ENOPROTOOPTs except default case */
      if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
            int len;

            if (get_user(len, optlen))
                  return -EFAULT;

            lock_sock(sk);
            err = compat_nf_getsockopt(sk, PF_INET6,
                                 optname, optval, &len);
            release_sock(sk);
            if (err >= 0)
                  err = put_user(len, optlen);
      }
#endif
      return err;
}

EXPORT_SYMBOL(compat_ipv6_getsockopt);
#endif

void __init ipv6_packet_init(void)
{
      dev_add_pack(&ipv6_packet_type);
}

void ipv6_packet_cleanup(void)
{
      dev_remove_pack(&ipv6_packet_type);
}

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