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ip6_output.c

/*
 *    IPv6 output functions
 *    Linux INET6 implementation
 *
 *    Authors:
 *    Pedro Roque       <roque@di.fc.ul.pt>
 *
 *    $Id: ip6_output.c,v 1.34 2002/02/01 22:01:04 davem Exp $
 *
 *    Based on linux/net/ipv4/ip_output.c
 *
 *    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.
 *
 *    Changes:
 *    A.N.Kuznetsov     :     airthmetics in fragmentation.
 *                      extension headers are implemented.
 *                      route changes now work.
 *                      ip6_forward does not confuse sniffers.
 *                      etc.
 *
 *      H. von Brand    :       Added missing #include <linux/string.h>
 *    Imran Patel :     frag id should be in NBO
 *      Kazunori MIYAZAWA @USAGI
 *                :       add ip6_append_data and related functions
 *                      for datagram xmit
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/tcp.h>
#include <linux/route.h>
#include <linux/module.h>

#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>

#include <net/sock.h>
#include <net/snmp.h>

#include <net/ipv6.h>
#include <net/ndisc.h>
#include <net/protocol.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/rawv6.h>
#include <net/icmp.h>
#include <net/xfrm.h>
#include <net/checksum.h>

static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));

static __inline__ void ipv6_select_ident(struct sk_buff *skb, struct frag_hdr *fhdr)
{
      static u32 ipv6_fragmentation_id = 1;
      static DEFINE_SPINLOCK(ip6_id_lock);

      spin_lock_bh(&ip6_id_lock);
      fhdr->identification = htonl(ipv6_fragmentation_id);
      if (++ipv6_fragmentation_id == 0)
            ipv6_fragmentation_id = 1;
      spin_unlock_bh(&ip6_id_lock);
}

static int ip6_output_finish(struct sk_buff *skb)
{
      struct dst_entry *dst = skb->dst;

      if (dst->hh)
            return neigh_hh_output(dst->hh, skb);
      else if (dst->neighbour)
            return dst->neighbour->output(skb);

      IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
      kfree_skb(skb);
      return -EINVAL;

}

/* dev_loopback_xmit for use with netfilter. */
static int ip6_dev_loopback_xmit(struct sk_buff *newskb)
{
      skb_reset_mac_header(newskb);
      __skb_pull(newskb, skb_network_offset(newskb));
      newskb->pkt_type = PACKET_LOOPBACK;
      newskb->ip_summed = CHECKSUM_UNNECESSARY;
      BUG_TRAP(newskb->dst);

      netif_rx(newskb);
      return 0;
}


static int ip6_output2(struct sk_buff *skb)
{
      struct dst_entry *dst = skb->dst;
      struct net_device *dev = dst->dev;

      skb->protocol = htons(ETH_P_IPV6);
      skb->dev = dev;

      if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
            struct ipv6_pinfo* np = skb->sk ? inet6_sk(skb->sk) : NULL;
            struct inet6_dev *idev = ip6_dst_idev(skb->dst);

            if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) &&
                ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
                              &ipv6_hdr(skb)->saddr)) {
                  struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);

                  /* Do not check for IFF_ALLMULTI; multicast routing
                     is not supported in any case.
                   */
                  if (newskb)
                        NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, newskb, NULL,
                              newskb->dev,
                              ip6_dev_loopback_xmit);

                  if (ipv6_hdr(skb)->hop_limit == 0) {
                        IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
                        kfree_skb(skb);
                        return 0;
                  }
            }

            IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
      }

      return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb,NULL, skb->dev,ip6_output_finish);
}

static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
{
      struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;

      return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
             skb->dst->dev->mtu : dst_mtu(skb->dst);
}

int ip6_output(struct sk_buff *skb)
{
      if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) ||
                        dst_allfrag(skb->dst))
            return ip6_fragment(skb, ip6_output2);
      else
            return ip6_output2(skb);
}

/*
 *    xmit an sk_buff (used by TCP)
 */

int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
           struct ipv6_txoptions *opt, int ipfragok)
{
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct in6_addr *first_hop = &fl->fl6_dst;
      struct dst_entry *dst = skb->dst;
      struct ipv6hdr *hdr;
      u8  proto = fl->proto;
      int seg_len = skb->len;
      int hlimit, tclass;
      u32 mtu;

      if (opt) {
            unsigned int head_room;

            /* First: exthdrs may take lots of space (~8K for now)
               MAX_HEADER is not enough.
             */
            head_room = opt->opt_nflen + opt->opt_flen;
            seg_len += head_room;
            head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev);

            if (skb_headroom(skb) < head_room) {
                  struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room);
                  if (skb2 == NULL) {
                        IP6_INC_STATS(ip6_dst_idev(skb->dst),
                                    IPSTATS_MIB_OUTDISCARDS);
                        kfree_skb(skb);
                        return -ENOBUFS;
                  }
                  kfree_skb(skb);
                  skb = skb2;
                  if (sk)
                        skb_set_owner_w(skb, sk);
            }
            if (opt->opt_flen)
                  ipv6_push_frag_opts(skb, opt, &proto);
            if (opt->opt_nflen)
                  ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop);
      }

      skb_push(skb, sizeof(struct ipv6hdr));
      skb_reset_network_header(skb);
      hdr = ipv6_hdr(skb);

      /*
       *    Fill in the IPv6 header
       */

      hlimit = -1;
      if (np)
            hlimit = np->hop_limit;
      if (hlimit < 0)
            hlimit = dst_metric(dst, RTAX_HOPLIMIT);
      if (hlimit < 0)
            hlimit = ipv6_get_hoplimit(dst->dev);

      tclass = -1;
      if (np)
            tclass = np->tclass;
      if (tclass < 0)
            tclass = 0;

      *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl->fl6_flowlabel;

      hdr->payload_len = htons(seg_len);
      hdr->nexthdr = proto;
      hdr->hop_limit = hlimit;

      ipv6_addr_copy(&hdr->saddr, &fl->fl6_src);
      ipv6_addr_copy(&hdr->daddr, first_hop);

      skb->priority = sk->sk_priority;

      mtu = dst_mtu(dst);
      if ((skb->len <= mtu) || ipfragok || skb_is_gso(skb)) {
            IP6_INC_STATS(ip6_dst_idev(skb->dst),
                        IPSTATS_MIB_OUTREQUESTS);
            return NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev,
                        dst_output);
      }

      if (net_ratelimit())
            printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n");
      skb->dev = dst->dev;
      icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
      IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS);
      kfree_skb(skb);
      return -EMSGSIZE;
}

EXPORT_SYMBOL(ip6_xmit);

/*
 *    To avoid extra problems ND packets are send through this
 *    routine. It's code duplication but I really want to avoid
 *    extra checks since ipv6_build_header is used by TCP (which
 *    is for us performance critical)
 */

int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev,
             struct in6_addr *saddr, struct in6_addr *daddr,
             int proto, int len)
{
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct ipv6hdr *hdr;
      int totlen;

      skb->protocol = htons(ETH_P_IPV6);
      skb->dev = dev;

      totlen = len + sizeof(struct ipv6hdr);

      skb_reset_network_header(skb);
      skb_put(skb, sizeof(struct ipv6hdr));
      hdr = ipv6_hdr(skb);

      *(__be32*)hdr = htonl(0x60000000);

      hdr->payload_len = htons(len);
      hdr->nexthdr = proto;
      hdr->hop_limit = np->hop_limit;

      ipv6_addr_copy(&hdr->saddr, saddr);
      ipv6_addr_copy(&hdr->daddr, daddr);

      return 0;
}

static int ip6_call_ra_chain(struct sk_buff *skb, int sel)
{
      struct ip6_ra_chain *ra;
      struct sock *last = NULL;

      read_lock(&ip6_ra_lock);
      for (ra = ip6_ra_chain; ra; ra = ra->next) {
            struct sock *sk = ra->sk;
            if (sk && ra->sel == sel &&
                (!sk->sk_bound_dev_if ||
                 sk->sk_bound_dev_if == skb->dev->ifindex)) {
                  if (last) {
                        struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
                        if (skb2)
                              rawv6_rcv(last, skb2);
                  }
                  last = sk;
            }
      }

      if (last) {
            rawv6_rcv(last, skb);
            read_unlock(&ip6_ra_lock);
            return 1;
      }
      read_unlock(&ip6_ra_lock);
      return 0;
}

static int ip6_forward_proxy_check(struct sk_buff *skb)
{
      struct ipv6hdr *hdr = ipv6_hdr(skb);
      u8 nexthdr = hdr->nexthdr;
      int offset;

      if (ipv6_ext_hdr(nexthdr)) {
            offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr);
            if (offset < 0)
                  return 0;
      } else
            offset = sizeof(struct ipv6hdr);

      if (nexthdr == IPPROTO_ICMPV6) {
            struct icmp6hdr *icmp6;

            if (!pskb_may_pull(skb, (skb_network_header(skb) +
                               offset + 1 - skb->data)))
                  return 0;

            icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);

            switch (icmp6->icmp6_type) {
            case NDISC_ROUTER_SOLICITATION:
            case NDISC_ROUTER_ADVERTISEMENT:
            case NDISC_NEIGHBOUR_SOLICITATION:
            case NDISC_NEIGHBOUR_ADVERTISEMENT:
            case NDISC_REDIRECT:
                  /* For reaction involving unicast neighbor discovery
                   * message destined to the proxied address, pass it to
                   * input function.
                   */
                  return 1;
            default:
                  break;
            }
      }

      /*
       * The proxying router can't forward traffic sent to a link-local
       * address, so signal the sender and discard the packet. This
       * behavior is clarified by the MIPv6 specification.
       */
      if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) {
            dst_link_failure(skb);
            return -1;
      }

      return 0;
}

static inline int ip6_forward_finish(struct sk_buff *skb)
{
      return dst_output(skb);
}

int ip6_forward(struct sk_buff *skb)
{
      struct dst_entry *dst = skb->dst;
      struct ipv6hdr *hdr = ipv6_hdr(skb);
      struct inet6_skb_parm *opt = IP6CB(skb);

      if (ipv6_devconf.forwarding == 0)
            goto error;

      if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) {
            IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS);
            goto drop;
      }

      skb_forward_csum(skb);

      /*
       *    We DO NOT make any processing on
       *    RA packets, pushing them to user level AS IS
       *    without ane WARRANTY that application will be able
       *    to interpret them. The reason is that we
       *    cannot make anything clever here.
       *
       *    We are not end-node, so that if packet contains
       *    AH/ESP, we cannot make anything.
       *    Defragmentation also would be mistake, RA packets
       *    cannot be fragmented, because there is no warranty
       *    that different fragments will go along one path. --ANK
       */
      if (opt->ra) {
            u8 *ptr = skb_network_header(skb) + opt->ra;
            if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3]))
                  return 0;
      }

      /*
       *    check and decrement ttl
       */
      if (hdr->hop_limit <= 1) {
            /* Force OUTPUT device used as source address */
            skb->dev = dst->dev;
            icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
                      0, skb->dev);
            IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS);

            kfree_skb(skb);
            return -ETIMEDOUT;
      }

      /* XXX: idev->cnf.proxy_ndp? */
      if (ipv6_devconf.proxy_ndp &&
          pneigh_lookup(&nd_tbl, &hdr->daddr, skb->dev, 0)) {
            int proxied = ip6_forward_proxy_check(skb);
            if (proxied > 0)
                  return ip6_input(skb);
            else if (proxied < 0) {
                  IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS);
                  goto drop;
            }
      }

      if (!xfrm6_route_forward(skb)) {
            IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS);
            goto drop;
      }
      dst = skb->dst;

      /* IPv6 specs say nothing about it, but it is clear that we cannot
         send redirects to source routed frames.
         We don't send redirects to frames decapsulated from IPsec.
       */
      if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0 &&
          !skb->sp) {
            struct in6_addr *target = NULL;
            struct rt6_info *rt;
            struct neighbour *n = dst->neighbour;

            /*
             *    incoming and outgoing devices are the same
             *    send a redirect.
             */

            rt = (struct rt6_info *) dst;
            if ((rt->rt6i_flags & RTF_GATEWAY))
                  target = (struct in6_addr*)&n->primary_key;
            else
                  target = &hdr->daddr;

            /* Limit redirects both by destination (here)
               and by source (inside ndisc_send_redirect)
             */
            if (xrlim_allow(dst, 1*HZ))
                  ndisc_send_redirect(skb, n, target);
      } else {
            int addrtype = ipv6_addr_type(&hdr->saddr);

            /* This check is security critical. */
            if (addrtype & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LOOPBACK))
                  goto error;
            if (addrtype & IPV6_ADDR_LINKLOCAL) {
                  icmpv6_send(skb, ICMPV6_DEST_UNREACH,
                        ICMPV6_NOT_NEIGHBOUR, 0, skb->dev);
                  goto error;
            }
      }

      if (skb->len > dst_mtu(dst)) {
            /* Again, force OUTPUT device used as source address */
            skb->dev = dst->dev;
            icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, dst_mtu(dst), skb->dev);
            IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS);
            IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS);
            kfree_skb(skb);
            return -EMSGSIZE;
      }

      if (skb_cow(skb, dst->dev->hard_header_len)) {
            IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS);
            goto drop;
      }

      hdr = ipv6_hdr(skb);

      /* Mangling hops number delayed to point after skb COW */

      hdr->hop_limit--;

      IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS);
      return NF_HOOK(PF_INET6,NF_IP6_FORWARD, skb, skb->dev, dst->dev, ip6_forward_finish);

error:
      IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS);
drop:
      kfree_skb(skb);
      return -EINVAL;
}

static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from)
{
      to->pkt_type = from->pkt_type;
      to->priority = from->priority;
      to->protocol = from->protocol;
      dst_release(to->dst);
      to->dst = dst_clone(from->dst);
      to->dev = from->dev;
      to->mark = from->mark;

#ifdef CONFIG_NET_SCHED
      to->tc_index = from->tc_index;
#endif
      nf_copy(to, from);
#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
    defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
      to->nf_trace = from->nf_trace;
#endif
      skb_copy_secmark(to, from);
}

int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
{
      u16 offset = sizeof(struct ipv6hdr);
      struct ipv6_opt_hdr *exthdr =
                        (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
      unsigned int packet_len = skb->tail - skb->network_header;
      int found_rhdr = 0;
      *nexthdr = &ipv6_hdr(skb)->nexthdr;

      while (offset + 1 <= packet_len) {

            switch (**nexthdr) {

            case NEXTHDR_HOP:
                  break;
            case NEXTHDR_ROUTING:
                  found_rhdr = 1;
                  break;
            case NEXTHDR_DEST:
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
                  if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
                        break;
#endif
                  if (found_rhdr)
                        return offset;
                  break;
            default :
                  return offset;
            }

            offset += ipv6_optlen(exthdr);
            *nexthdr = &exthdr->nexthdr;
            exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
                                     offset);
      }

      return offset;
}
EXPORT_SYMBOL_GPL(ip6_find_1stfragopt);

static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
{
      struct net_device *dev;
      struct sk_buff *frag;
      struct rt6_info *rt = (struct rt6_info*)skb->dst;
      struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
      struct ipv6hdr *tmp_hdr;
      struct frag_hdr *fh;
      unsigned int mtu, hlen, left, len;
      __be32 frag_id = 0;
      int ptr, offset = 0, err=0;
      u8 *prevhdr, nexthdr = 0;

      dev = rt->u.dst.dev;
      hlen = ip6_find_1stfragopt(skb, &prevhdr);
      nexthdr = *prevhdr;

      mtu = ip6_skb_dst_mtu(skb);

      /* We must not fragment if the socket is set to force MTU discovery
       * or if the skb it not generated by a local socket.  (This last
       * check should be redundant, but it's free.)
       */
      if (!np || np->pmtudisc >= IPV6_PMTUDISC_DO) {
            skb->dev = skb->dst->dev;
            icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
            IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS);
            kfree_skb(skb);
            return -EMSGSIZE;
      }

      if (np && np->frag_size < mtu) {
            if (np->frag_size)
                  mtu = np->frag_size;
      }
      mtu -= hlen + sizeof(struct frag_hdr);

      if (skb_shinfo(skb)->frag_list) {
            int first_len = skb_pagelen(skb);

            if (first_len - hlen > mtu ||
                ((first_len - hlen) & 7) ||
                skb_cloned(skb))
                  goto slow_path;

            for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
                  /* Correct geometry. */
                  if (frag->len > mtu ||
                      ((frag->len & 7) && frag->next) ||
                      skb_headroom(frag) < hlen)
                      goto slow_path;

                  /* Partially cloned skb? */
                  if (skb_shared(frag))
                        goto slow_path;

                  BUG_ON(frag->sk);
                  if (skb->sk) {
                        sock_hold(skb->sk);
                        frag->sk = skb->sk;
                        frag->destructor = sock_wfree;
                        skb->truesize -= frag->truesize;
                  }
            }

            err = 0;
            offset = 0;
            frag = skb_shinfo(skb)->frag_list;
            skb_shinfo(skb)->frag_list = NULL;
            /* BUILD HEADER */

            *prevhdr = NEXTHDR_FRAGMENT;
            tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC);
            if (!tmp_hdr) {
                  IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS);
                  return -ENOMEM;
            }

            __skb_pull(skb, hlen);
            fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr));
            __skb_push(skb, hlen);
            skb_reset_network_header(skb);
            memcpy(skb_network_header(skb), tmp_hdr, hlen);

            ipv6_select_ident(skb, fh);
            fh->nexthdr = nexthdr;
            fh->reserved = 0;
            fh->frag_off = htons(IP6_MF);
            frag_id = fh->identification;

            first_len = skb_pagelen(skb);
            skb->data_len = first_len - skb_headlen(skb);
            skb->len = first_len;
            ipv6_hdr(skb)->payload_len = htons(first_len -
                                       sizeof(struct ipv6hdr));

            dst_hold(&rt->u.dst);

            for (;;) {
                  /* Prepare header of the next frame,
                   * before previous one went down. */
                  if (frag) {
                        frag->ip_summed = CHECKSUM_NONE;
                        skb_reset_transport_header(frag);
                        fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr));
                        __skb_push(frag, hlen);
                        skb_reset_network_header(frag);
                        memcpy(skb_network_header(frag), tmp_hdr,
                               hlen);
                        offset += skb->len - hlen - sizeof(struct frag_hdr);
                        fh->nexthdr = nexthdr;
                        fh->reserved = 0;
                        fh->frag_off = htons(offset);
                        if (frag->next != NULL)
                              fh->frag_off |= htons(IP6_MF);
                        fh->identification = frag_id;
                        ipv6_hdr(frag)->payload_len =
                                    htons(frag->len -
                                          sizeof(struct ipv6hdr));
                        ip6_copy_metadata(frag, skb);
                  }

                  err = output(skb);
                  if(!err)
                        IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGCREATES);

                  if (err || !frag)
                        break;

                  skb = frag;
                  frag = skb->next;
                  skb->next = NULL;
            }

            kfree(tmp_hdr);

            if (err == 0) {
                  IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGOKS);
                  dst_release(&rt->u.dst);
                  return 0;
            }

            while (frag) {
                  skb = frag->next;
                  kfree_skb(frag);
                  frag = skb;
            }

            IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGFAILS);
            dst_release(&rt->u.dst);
            return err;
      }

slow_path:
      left = skb->len - hlen;       /* Space per frame */
      ptr = hlen;             /* Where to start from */

      /*
       *    Fragment the datagram.
       */

      *prevhdr = NEXTHDR_FRAGMENT;

      /*
       *    Keep copying data until we run out.
       */
      while(left > 0)   {
            len = left;
            /* IF: it doesn't fit, use 'mtu' - the data space left */
            if (len > mtu)
                  len = mtu;
            /* IF: we are not sending upto and including the packet end
               then align the next start on an eight byte boundary */
            if (len < left)   {
                  len &= ~7;
            }
            /*
             *    Allocate buffer.
             */

            if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_RESERVED_SPACE(rt->u.dst.dev), GFP_ATOMIC)) == NULL) {
                  NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n");
                  IP6_INC_STATS(ip6_dst_idev(skb->dst),
                              IPSTATS_MIB_FRAGFAILS);
                  err = -ENOMEM;
                  goto fail;
            }

            /*
             *    Set up data on packet
             */

            ip6_copy_metadata(frag, skb);
            skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev));
            skb_put(frag, len + hlen + sizeof(struct frag_hdr));
            skb_reset_network_header(frag);
            fh = (struct frag_hdr *)(skb_network_header(frag) + hlen);
            frag->transport_header = (frag->network_header + hlen +
                                sizeof(struct frag_hdr));

            /*
             *    Charge the memory for the fragment to any owner
             *    it might possess
             */
            if (skb->sk)
                  skb_set_owner_w(frag, skb->sk);

            /*
             *    Copy the packet header into the new buffer.
             */
            skb_copy_from_linear_data(skb, skb_network_header(frag), hlen);

            /*
             *    Build fragment header.
             */
            fh->nexthdr = nexthdr;
            fh->reserved = 0;
            if (!frag_id) {
                  ipv6_select_ident(skb, fh);
                  frag_id = fh->identification;
            } else
                  fh->identification = frag_id;

            /*
             *    Copy a block of the IP datagram.
             */
            if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len))
                  BUG();
            left -= len;

            fh->frag_off = htons(offset);
            if (left > 0)
                  fh->frag_off |= htons(IP6_MF);
            ipv6_hdr(frag)->payload_len = htons(frag->len -
                                        sizeof(struct ipv6hdr));

            ptr += len;
            offset += len;

            /*
             *    Put this fragment into the sending queue.
             */
            err = output(frag);
            if (err)
                  goto fail;

            IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGCREATES);
      }
      IP6_INC_STATS(ip6_dst_idev(skb->dst),
                  IPSTATS_MIB_FRAGOKS);
      kfree_skb(skb);
      return err;

fail:
      IP6_INC_STATS(ip6_dst_idev(skb->dst),
                  IPSTATS_MIB_FRAGFAILS);
      kfree_skb(skb);
      return err;
}

static inline int ip6_rt_check(struct rt6key *rt_key,
                         struct in6_addr *fl_addr,
                         struct in6_addr *addr_cache)
{
      return ((rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) &&
            (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache)));
}

static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
                                struct dst_entry *dst,
                                struct flowi *fl)
{
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct rt6_info *rt = (struct rt6_info *)dst;

      if (!dst)
            goto out;

      /* Yes, checking route validity in not connected
       * case is not very simple. Take into account,
       * that we do not support routing by source, TOS,
       * and MSG_DONTROUTE          --ANK (980726)
       *
       * 1. ip6_rt_check(): If route was host route,
       *    check that cached destination is current.
       *    If it is network route, we still may
       *    check its validity using saved pointer
       *    to the last used address: daddr_cache.
       *    We do not want to save whole address now,
       *    (because main consumer of this service
       *    is tcp, which has not this problem),
       *    so that the last trick works only on connected
       *    sockets.
       * 2. oif also should be the same.
       */
      if (ip6_rt_check(&rt->rt6i_dst, &fl->fl6_dst, np->daddr_cache) ||
#ifdef CONFIG_IPV6_SUBTREES
          ip6_rt_check(&rt->rt6i_src, &fl->fl6_src, np->saddr_cache) ||
#endif
          (fl->oif && fl->oif != dst->dev->ifindex)) {
            dst_release(dst);
            dst = NULL;
      }

out:
      return dst;
}

static int ip6_dst_lookup_tail(struct sock *sk,
                         struct dst_entry **dst, struct flowi *fl)
{
      int err;

      if (*dst == NULL)
            *dst = ip6_route_output(sk, fl);

      if ((err = (*dst)->error))
            goto out_err_release;

      if (ipv6_addr_any(&fl->fl6_src)) {
            err = ipv6_get_saddr(*dst, &fl->fl6_dst, &fl->fl6_src);
            if (err)
                  goto out_err_release;
      }

#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
            /*
             * Here if the dst entry we've looked up
             * has a neighbour entry that is in the INCOMPLETE
             * state and the src address from the flow is
             * marked as OPTIMISTIC, we release the found
             * dst entry and replace it instead with the
             * dst entry of the nexthop router
             */
            if (!((*dst)->neighbour->nud_state & NUD_VALID)) {
                  struct inet6_ifaddr *ifp;
                  struct flowi fl_gw;
                  int redirect;

                  ifp = ipv6_get_ifaddr(&fl->fl6_src, (*dst)->dev, 1);

                  redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
                  if (ifp)
                        in6_ifa_put(ifp);

                  if (redirect) {
                        /*
                         * We need to get the dst entry for the
                         * default router instead
                         */
                        dst_release(*dst);
                        memcpy(&fl_gw, fl, sizeof(struct flowi));
                        memset(&fl_gw.fl6_dst, 0, sizeof(struct in6_addr));
                        *dst = ip6_route_output(sk, &fl_gw);
                        if ((err = (*dst)->error))
                              goto out_err_release;
                  }
            }
#endif

      return 0;

out_err_release:
      if (err == -ENETUNREACH)
            IP6_INC_STATS_BH(NULL, IPSTATS_MIB_OUTNOROUTES);
      dst_release(*dst);
      *dst = NULL;
      return err;
}

/**
 *    ip6_dst_lookup - perform route lookup on flow
 *    @sk: socket which provides route info
 *    @dst: pointer to dst_entry * for result
 *    @fl: flow to lookup
 *
 *    This function performs a route lookup on the given flow.
 *
 *    It returns zero on success, or a standard errno code on error.
 */
int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
{
      *dst = NULL;
      return ip6_dst_lookup_tail(sk, dst, fl);
}
EXPORT_SYMBOL_GPL(ip6_dst_lookup);

/**
 *    ip6_sk_dst_lookup - perform socket cached route lookup on flow
 *    @sk: socket which provides the dst cache and route info
 *    @dst: pointer to dst_entry * for result
 *    @fl: flow to lookup
 *
 *    This function performs a route lookup on the given flow with the
 *    possibility of using the cached route in the socket if it is valid.
 *    It will take the socket dst lock when operating on the dst cache.
 *    As a result, this function can only be used in process context.
 *
 *    It returns zero on success, or a standard errno code on error.
 */
int ip6_sk_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
{
      *dst = NULL;
      if (sk) {
            *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
            *dst = ip6_sk_dst_check(sk, *dst, fl);
      }

      return ip6_dst_lookup_tail(sk, dst, fl);
}
EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup);

static inline int ip6_ufo_append_data(struct sock *sk,
                  int getfrag(void *from, char *to, int offset, int len,
                  int odd, struct sk_buff *skb),
                  void *from, int length, int hh_len, int fragheaderlen,
                  int transhdrlen, int mtu,unsigned int flags)

{
      struct sk_buff *skb;
      int err;

      /* There is support for UDP large send offload by network
       * device, so create one single skb packet containing complete
       * udp datagram
       */
      if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) {
            skb = sock_alloc_send_skb(sk,
                  hh_len + fragheaderlen + transhdrlen + 20,
                  (flags & MSG_DONTWAIT), &err);
            if (skb == NULL)
                  return -ENOMEM;

            /* reserve space for Hardware header */
            skb_reserve(skb, hh_len);

            /* create space for UDP/IP header */
            skb_put(skb,fragheaderlen + transhdrlen);

            /* initialize network header pointer */
            skb_reset_network_header(skb);

            /* initialize protocol header pointer */
            skb->transport_header = skb->network_header + fragheaderlen;

            skb->ip_summed = CHECKSUM_PARTIAL;
            skb->csum = 0;
            sk->sk_sndmsg_off = 0;
      }

      err = skb_append_datato_frags(sk,skb, getfrag, from,
                              (length - transhdrlen));
      if (!err) {
            struct frag_hdr fhdr;

            /* specify the length of each IP datagram fragment*/
            skb_shinfo(skb)->gso_size = mtu - fragheaderlen -
                                  sizeof(struct frag_hdr);
            skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
            ipv6_select_ident(skb, &fhdr);
            skb_shinfo(skb)->ip6_frag_id = fhdr.identification;
            __skb_queue_tail(&sk->sk_write_queue, skb);

            return 0;
      }
      /* There is not enough support do UPD LSO,
       * so follow normal path
       */
      kfree_skb(skb);

      return err;
}

int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
      int offset, int len, int odd, struct sk_buff *skb),
      void *from, int length, int transhdrlen,
      int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi *fl,
      struct rt6_info *rt, unsigned int flags)
{
      struct inet_sock *inet = inet_sk(sk);
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct sk_buff *skb;
      unsigned int maxfraglen, fragheaderlen;
      int exthdrlen;
      int hh_len;
      int mtu;
      int copy;
      int err;
      int offset = 0;
      int csummode = CHECKSUM_NONE;

      if (flags&MSG_PROBE)
            return 0;
      if (skb_queue_empty(&sk->sk_write_queue)) {
            /*
             * setup for corking
             */
            if (opt) {
                  if (np->cork.opt == NULL) {
                        np->cork.opt = kmalloc(opt->tot_len,
                                           sk->sk_allocation);
                        if (unlikely(np->cork.opt == NULL))
                              return -ENOBUFS;
                  } else if (np->cork.opt->tot_len < opt->tot_len) {
                        printk(KERN_DEBUG "ip6_append_data: invalid option length\n");
                        return -EINVAL;
                  }
                  memcpy(np->cork.opt, opt, opt->tot_len);
                  inet->cork.flags |= IPCORK_OPT;
                  /* need source address above miyazawa*/
            }
            dst_hold(&rt->u.dst);
            np->cork.rt = rt;
            inet->cork.fl = *fl;
            np->cork.hop_limit = hlimit;
            np->cork.tclass = tclass;
            mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
                  rt->u.dst.dev->mtu : dst_mtu(rt->u.dst.path);
            if (np->frag_size < mtu) {
                  if (np->frag_size)
                        mtu = np->frag_size;
            }
            inet->cork.fragsize = mtu;
            if (dst_allfrag(rt->u.dst.path))
                  inet->cork.flags |= IPCORK_ALLFRAG;
            inet->cork.length = 0;
            sk->sk_sndmsg_page = NULL;
            sk->sk_sndmsg_off = 0;
            exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0);
            length += exthdrlen;
            transhdrlen += exthdrlen;
      } else {
            rt = np->cork.rt;
            fl = &inet->cork.fl;
            if (inet->cork.flags & IPCORK_OPT)
                  opt = np->cork.opt;
            transhdrlen = 0;
            exthdrlen = 0;
            mtu = inet->cork.fragsize;
      }

      hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);

      fragheaderlen = sizeof(struct ipv6hdr) + rt->u.dst.nfheader_len + (opt ? opt->opt_nflen : 0);
      maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr);

      if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) {
            if (inet->cork.length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) {
                  ipv6_local_error(sk, EMSGSIZE, fl, mtu-exthdrlen);
                  return -EMSGSIZE;
            }
      }

      /*
       * Let's try using as much space as possible.
       * Use MTU if total length of the message fits into the MTU.
       * Otherwise, we need to reserve fragment header and
       * fragment alignment (= 8-15 octects, in total).
       *
       * Note that we may need to "move" the data from the tail of
       * of the buffer to the new fragment when we split
       * the message.
       *
       * FIXME: It may be fragmented into multiple chunks
       *        at once if non-fragmentable extension headers
       *        are too large.
       * --yoshfuji
       */

      inet->cork.length += length;
      if (((length > mtu) && (sk->sk_protocol == IPPROTO_UDP)) &&
          (rt->u.dst.dev->features & NETIF_F_UFO)) {

            err = ip6_ufo_append_data(sk, getfrag, from, length, hh_len,
                                fragheaderlen, transhdrlen, mtu,
                                flags);
            if (err)
                  goto error;
            return 0;
      }

      if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL)
            goto alloc_new_skb;

      while (length > 0) {
            /* Check if the remaining data fits into current packet. */
            copy = (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;
            if (copy < length)
                  copy = maxfraglen - skb->len;

            if (copy <= 0) {
                  char *data;
                  unsigned int datalen;
                  unsigned int fraglen;
                  unsigned int fraggap;
                  unsigned int alloclen;
                  struct sk_buff *skb_prev;
alloc_new_skb:
                  skb_prev = skb;

                  /* There's no room in the current skb */
                  if (skb_prev)
                        fraggap = skb_prev->len - maxfraglen;
                  else
                        fraggap = 0;

                  /*
                   * If remaining data exceeds the mtu,
                   * we know we need more fragment(s).
                   */
                  datalen = length + fraggap;
                  if (datalen > (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
                        datalen = maxfraglen - fragheaderlen;

                  fraglen = datalen + fragheaderlen;
                  if ((flags & MSG_MORE) &&
                      !(rt->u.dst.dev->features&NETIF_F_SG))
                        alloclen = mtu;
                  else
                        alloclen = datalen + fragheaderlen;

                  /*
                   * The last fragment gets additional space at tail.
                   * Note: we overallocate on fragments with MSG_MODE
                   * because we have no idea if we're the last one.
                   */
                  if (datalen == length + fraggap)
                        alloclen += rt->u.dst.trailer_len;

                  /*
                   * We just reserve space for fragment header.
                   * Note: this may be overallocation if the message
                   * (without MSG_MORE) fits into the MTU.
                   */
                  alloclen += sizeof(struct frag_hdr);

                  if (transhdrlen) {
                        skb = sock_alloc_send_skb(sk,
                                    alloclen + hh_len,
                                    (flags & MSG_DONTWAIT), &err);
                  } else {
                        skb = NULL;
                        if (atomic_read(&sk->sk_wmem_alloc) <=
                            2 * sk->sk_sndbuf)
                              skb = sock_wmalloc(sk,
                                             alloclen + hh_len, 1,
                                             sk->sk_allocation);
                        if (unlikely(skb == NULL))
                              err = -ENOBUFS;
                  }
                  if (skb == NULL)
                        goto error;
                  /*
                   *    Fill in the control structures
                   */
                  skb->ip_summed = csummode;
                  skb->csum = 0;
                  /* reserve for fragmentation */
                  skb_reserve(skb, hh_len+sizeof(struct frag_hdr));

                  /*
                   *    Find where to start putting bytes
                   */
                  data = skb_put(skb, fraglen);
                  skb_set_network_header(skb, exthdrlen);
                  data += fragheaderlen;
                  skb->transport_header = (skb->network_header +
                                     fragheaderlen);
                  if (fraggap) {
                        skb->csum = skb_copy_and_csum_bits(
                              skb_prev, maxfraglen,
                              data + transhdrlen, fraggap, 0);
                        skb_prev->csum = csum_sub(skb_prev->csum,
                                            skb->csum);
                        data += fraggap;
                        pskb_trim_unique(skb_prev, maxfraglen);
                  }
                  copy = datalen - transhdrlen - fraggap;
                  if (copy < 0) {
                        err = -EINVAL;
                        kfree_skb(skb);
                        goto error;
                  } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) {
                        err = -EFAULT;
                        kfree_skb(skb);
                        goto error;
                  }

                  offset += copy;
                  length -= datalen - fraggap;
                  transhdrlen = 0;
                  exthdrlen = 0;
                  csummode = CHECKSUM_NONE;

                  /*
                   * Put the packet on the pending queue
                   */
                  __skb_queue_tail(&sk->sk_write_queue, skb);
                  continue;
            }

            if (copy > length)
                  copy = length;

            if (!(rt->u.dst.dev->features&NETIF_F_SG)) {
                  unsigned int off;

                  off = skb->len;
                  if (getfrag(from, skb_put(skb, copy),
                                    offset, copy, off, skb) < 0) {
                        __skb_trim(skb, off);
                        err = -EFAULT;
                        goto error;
                  }
            } else {
                  int i = skb_shinfo(skb)->nr_frags;
                  skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1];
                  struct page *page = sk->sk_sndmsg_page;
                  int off = sk->sk_sndmsg_off;
                  unsigned int left;

                  if (page && (left = PAGE_SIZE - off) > 0) {
                        if (copy >= left)
                              copy = left;
                        if (page != frag->page) {
                              if (i == MAX_SKB_FRAGS) {
                                    err = -EMSGSIZE;
                                    goto error;
                              }
                              get_page(page);
                              skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0);
                              frag = &skb_shinfo(skb)->frags[i];
                        }
                  } else if(i < MAX_SKB_FRAGS) {
                        if (copy > PAGE_SIZE)
                              copy = PAGE_SIZE;
                        page = alloc_pages(sk->sk_allocation, 0);
                        if (page == NULL) {
                              err = -ENOMEM;
                              goto error;
                        }
                        sk->sk_sndmsg_page = page;
                        sk->sk_sndmsg_off = 0;

                        skb_fill_page_desc(skb, i, page, 0, 0);
                        frag = &skb_shinfo(skb)->frags[i];
                  } else {
                        err = -EMSGSIZE;
                        goto error;
                  }
                  if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) {
                        err = -EFAULT;
                        goto error;
                  }
                  sk->sk_sndmsg_off += copy;
                  frag->size += copy;
                  skb->len += copy;
                  skb->data_len += copy;
                  skb->truesize += copy;
                  atomic_add(copy, &sk->sk_wmem_alloc);
            }
            offset += copy;
            length -= copy;
      }
      return 0;
error:
      inet->cork.length -= length;
      IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
      return err;
}

static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np)
{
      inet->cork.flags &= ~IPCORK_OPT;
      kfree(np->cork.opt);
      np->cork.opt = NULL;
      if (np->cork.rt) {
            dst_release(&np->cork.rt->u.dst);
            np->cork.rt = NULL;
            inet->cork.flags &= ~IPCORK_ALLFRAG;
      }
      memset(&inet->cork.fl, 0, sizeof(inet->cork.fl));
}

int ip6_push_pending_frames(struct sock *sk)
{
      struct sk_buff *skb, *tmp_skb;
      struct sk_buff **tail_skb;
      struct in6_addr final_dst_buf, *final_dst = &final_dst_buf;
      struct inet_sock *inet = inet_sk(sk);
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct ipv6hdr *hdr;
      struct ipv6_txoptions *opt = np->cork.opt;
      struct rt6_info *rt = np->cork.rt;
      struct flowi *fl = &inet->cork.fl;
      unsigned char proto = fl->proto;
      int err = 0;

      if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL)
            goto out;
      tail_skb = &(skb_shinfo(skb)->frag_list);

      /* move skb->data to ip header from ext header */
      if (skb->data < skb_network_header(skb))
            __skb_pull(skb, skb_network_offset(skb));
      while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) {
            __skb_pull(tmp_skb, skb_network_header_len(skb));
            *tail_skb = tmp_skb;
            tail_skb = &(tmp_skb->next);
            skb->len += tmp_skb->len;
            skb->data_len += tmp_skb->len;
            skb->truesize += tmp_skb->truesize;
            __sock_put(tmp_skb->sk);
            tmp_skb->destructor = NULL;
            tmp_skb->sk = NULL;
      }

      ipv6_addr_copy(final_dst, &fl->fl6_dst);
      __skb_pull(skb, skb_network_header_len(skb));
      if (opt && opt->opt_flen)
            ipv6_push_frag_opts(skb, opt, &proto);
      if (opt && opt->opt_nflen)
            ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst);

      skb_push(skb, sizeof(struct ipv6hdr));
      skb_reset_network_header(skb);
      hdr = ipv6_hdr(skb);

      *(__be32*)hdr = fl->fl6_flowlabel |
                 htonl(0x60000000 | ((int)np->cork.tclass << 20));

      if (skb->len <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN)
            hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
      else
            hdr->payload_len = 0;
      hdr->hop_limit = np->cork.hop_limit;
      hdr->nexthdr = proto;
      ipv6_addr_copy(&hdr->saddr, &fl->fl6_src);
      ipv6_addr_copy(&hdr->daddr, final_dst);

      skb->priority = sk->sk_priority;

      skb->dst = dst_clone(&rt->u.dst);
      IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
      if (proto == IPPROTO_ICMPV6) {
            struct inet6_dev *idev = ip6_dst_idev(skb->dst);

            ICMP6MSGOUT_INC_STATS_BH(idev, icmp6_hdr(skb)->icmp6_type);
            ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
      }

      err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dst->dev, dst_output);
      if (err) {
            if (err > 0)
                  err = np->recverr ? net_xmit_errno(err) : 0;
            if (err)
                  goto error;
      }

out:
      ip6_cork_release(inet, np);
      return err;
error:
      goto out;
}

void ip6_flush_pending_frames(struct sock *sk)
{
      struct sk_buff *skb;

      while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) {
            if (skb->dst)
                  IP6_INC_STATS(ip6_dst_idev(skb->dst),
                              IPSTATS_MIB_OUTDISCARDS);
            kfree_skb(skb);
      }

      ip6_cork_release(inet_sk(sk), inet6_sk(sk));
}

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