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udp.c

/*
 *    UDP over IPv6
 *    Linux INET6 implementation
 *
 *    Authors:
 *    Pedro Roque       <roque@di.fc.ul.pt>
 *
 *    Based on linux/ipv4/udp.c
 *
 *    $Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $
 *
 *    Fixes:
 *    Hideaki YOSHIFUJI :     sin6_scope_id support
 *    YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
 *    Alexey Kuznetsov        allow both IPv4 and IPv6 sockets to bind
 *                            a single port at the same time.
 *      Kazunori MIYAZAWA @USAGI:       change process style to use ip6_append_data
 *      YOSHIFUJI Hideaki @USAGI:   convert /proc/net/udp6 to seq_file.
 *
 *    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/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/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <asm/uaccess.h>

#include <net/ndisc.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/ip6_route.h>
#include <net/raw.h>
#include <net/tcp_states.h>
#include <net/ip6_checksum.h>
#include <net/xfrm.h>

#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include "udp_impl.h"

DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;

static inline int udp_v6_get_port(struct sock *sk, unsigned short snum)
{
      return udp_get_port(sk, snum, ipv6_rcv_saddr_equal);
}

static struct sock *__udp6_lib_lookup(struct in6_addr *saddr, __be16 sport,
                              struct in6_addr *daddr, __be16 dport,
                              int dif, struct hlist_head udptable[])
{
      struct sock *sk, *result = NULL;
      struct hlist_node *node;
      unsigned short hnum = ntohs(dport);
      int badness = -1;

      read_lock(&udp_hash_lock);
      sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
            struct inet_sock *inet = inet_sk(sk);

            if (sk->sk_hash == hnum && sk->sk_family == PF_INET6) {
                  struct ipv6_pinfo *np = inet6_sk(sk);
                  int score = 0;
                  if (inet->dport) {
                        if (inet->dport != sport)
                              continue;
                        score++;
                  }
                  if (!ipv6_addr_any(&np->rcv_saddr)) {
                        if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
                              continue;
                        score++;
                  }
                  if (!ipv6_addr_any(&np->daddr)) {
                        if (!ipv6_addr_equal(&np->daddr, saddr))
                              continue;
                        score++;
                  }
                  if (sk->sk_bound_dev_if) {
                        if (sk->sk_bound_dev_if != dif)
                              continue;
                        score++;
                  }
                  if (score == 4) {
                        result = sk;
                        break;
                  } else if (score > badness) {
                        result = sk;
                        badness = score;
                  }
            }
      }
      if (result)
            sock_hold(result);
      read_unlock(&udp_hash_lock);
      return result;
}

/*
 *    This should be easy, if there is something there we
 *    return it, otherwise we block.
 */

int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
              struct msghdr *msg, size_t len,
              int noblock, int flags, int *addr_len)
{
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct inet_sock *inet = inet_sk(sk);
      struct sk_buff *skb;
      unsigned int ulen, copied;
      int err;
      int is_udplite = IS_UDPLITE(sk);

      if (addr_len)
            *addr_len=sizeof(struct sockaddr_in6);

      if (flags & MSG_ERRQUEUE)
            return ipv6_recv_error(sk, msg, len);

try_again:
      skb = skb_recv_datagram(sk, flags, noblock, &err);
      if (!skb)
            goto out;

      ulen = skb->len - sizeof(struct udphdr);
      copied = len;
      if (copied > ulen)
            copied = ulen;
      else if (copied < ulen)
            msg->msg_flags |= MSG_TRUNC;

      /*
       * If checksum is needed at all, try to do it while copying the
       * data.  If the data is truncated, or if we only want a partial
       * coverage checksum (UDP-Lite), do it before the copy.
       */

      if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
            if (udp_lib_checksum_complete(skb))
                  goto csum_copy_err;
      }

      if (skb_csum_unnecessary(skb))
            err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
                                    msg->msg_iov, copied       );
      else {
            err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
            if (err == -EINVAL)
                  goto csum_copy_err;
      }
      if (err)
            goto out_free;

      sock_recv_timestamp(msg, sk, skb);

      /* Copy the address. */
      if (msg->msg_name) {
            struct sockaddr_in6 *sin6;

            sin6 = (struct sockaddr_in6 *) msg->msg_name;
            sin6->sin6_family = AF_INET6;
            sin6->sin6_port = udp_hdr(skb)->source;
            sin6->sin6_flowinfo = 0;
            sin6->sin6_scope_id = 0;

            if (skb->protocol == htons(ETH_P_IP))
                  ipv6_addr_set(&sin6->sin6_addr, 0, 0,
                              htonl(0xffff), ip_hdr(skb)->saddr);
            else {
                  ipv6_addr_copy(&sin6->sin6_addr,
                               &ipv6_hdr(skb)->saddr);
                  if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
                        sin6->sin6_scope_id = IP6CB(skb)->iif;
            }

      }
      if (skb->protocol == htons(ETH_P_IP)) {
            if (inet->cmsg_flags)
                  ip_cmsg_recv(msg, skb);
      } else {
            if (np->rxopt.all)
                  datagram_recv_ctl(sk, msg, skb);
      }

      err = copied;
      if (flags & MSG_TRUNC)
            err = ulen;

out_free:
      skb_free_datagram(sk, skb);
out:
      return err;

csum_copy_err:
      UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
      skb_kill_datagram(sk, skb, flags);

      if (flags & MSG_DONTWAIT)
            return -EAGAIN;
      goto try_again;
}

void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
                int type, int code, int offset, __be32 info,
                struct hlist_head udptable[]                    )
{
      struct ipv6_pinfo *np;
      struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
      struct in6_addr *saddr = &hdr->saddr;
      struct in6_addr *daddr = &hdr->daddr;
      struct udphdr *uh = (struct udphdr*)(skb->data+offset);
      struct sock *sk;
      int err;

      sk = __udp6_lib_lookup(daddr, uh->dest,
                         saddr, uh->source, inet6_iif(skb), udptable);
      if (sk == NULL)
            return;

      np = inet6_sk(sk);

      if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
            goto out;

      if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
            goto out;

      if (np->recverr)
            ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));

      sk->sk_err = err;
      sk->sk_error_report(sk);
out:
      sock_put(sk);
}

static __inline__ void udpv6_err(struct sk_buff *skb,
                         struct inet6_skb_parm *opt, int type,
                         int code, int offset, __be32 info     )
{
      return __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash);
}

int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
{
      struct udp_sock *up = udp_sk(sk);
      int rc;

      if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
            goto drop;

      /*
       * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
       */
      if ((up->pcflag & UDPLITE_RECV_CC)  &&  UDP_SKB_CB(skb)->partial_cov) {

            if (up->pcrlen == 0) {          /* full coverage was set  */
                  LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
                        " %d while full coverage %d requested\n",
                        UDP_SKB_CB(skb)->cscov, skb->len);
                  goto drop;
            }
            if (UDP_SKB_CB(skb)->cscov  <  up->pcrlen) {
                  LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
                                        "too small, need min %d\n",
                               UDP_SKB_CB(skb)->cscov, up->pcrlen);
                  goto drop;
            }
      }

      if (sk->sk_filter) {
            if (udp_lib_checksum_complete(skb))
                  goto drop;
      }

      if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
            /* Note that an ENOMEM error is charged twice */
            if (rc == -ENOMEM)
                  UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
            goto drop;
      }
      UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
      return 0;
drop:
      UDP6_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
      kfree_skb(skb);
      return -1;
}

static struct sock *udp_v6_mcast_next(struct sock *sk,
                              __be16 loc_port, struct in6_addr *loc_addr,
                              __be16 rmt_port, struct in6_addr *rmt_addr,
                              int dif)
{
      struct hlist_node *node;
      struct sock *s = sk;
      unsigned short num = ntohs(loc_port);

      sk_for_each_from(s, node) {
            struct inet_sock *inet = inet_sk(s);

            if (s->sk_hash == num && s->sk_family == PF_INET6) {
                  struct ipv6_pinfo *np = inet6_sk(s);
                  if (inet->dport) {
                        if (inet->dport != rmt_port)
                              continue;
                  }
                  if (!ipv6_addr_any(&np->daddr) &&
                      !ipv6_addr_equal(&np->daddr, rmt_addr))
                        continue;

                  if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
                        continue;

                  if (!ipv6_addr_any(&np->rcv_saddr)) {
                        if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
                              continue;
                  }
                  if (!inet6_mc_check(s, loc_addr, rmt_addr))
                        continue;
                  return s;
            }
      }
      return NULL;
}

/*
 * Note: called only from the BH handler context,
 * so we don't need to lock the hashes.
 */
static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr,
                     struct in6_addr *daddr, struct hlist_head udptable[])
{
      struct sock *sk, *sk2;
      const struct udphdr *uh = udp_hdr(skb);
      int dif;

      read_lock(&udp_hash_lock);
      sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
      dif = inet6_iif(skb);
      sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
      if (!sk) {
            kfree_skb(skb);
            goto out;
      }

      sk2 = sk;
      while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
                              uh->source, saddr, dif))) {
            struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
            if (buff)
                  udpv6_queue_rcv_skb(sk2, buff);
      }
      udpv6_queue_rcv_skb(sk, skb);
out:
      read_unlock(&udp_hash_lock);
      return 0;
}

static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
                         int proto)
{
      int err;

      UDP_SKB_CB(skb)->partial_cov = 0;
      UDP_SKB_CB(skb)->cscov = skb->len;

      if (proto == IPPROTO_UDPLITE) {
            err = udplite_checksum_init(skb, uh);
            if (err)
                  return err;
      }

      if (uh->check == 0) {
            /* RFC 2460 section 8.1 says that we SHOULD log
               this error. Well, it is reasonable.
             */
            LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
            return 1;
      }
      if (skb->ip_summed == CHECKSUM_COMPLETE &&
          !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
                       skb->len, proto, skb->csum))
            skb->ip_summed = CHECKSUM_UNNECESSARY;

      if (!skb_csum_unnecessary(skb))
            skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
                                           &ipv6_hdr(skb)->daddr,
                                           skb->len, proto, 0));

      return 0;
}

int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
               int proto)
{
      struct sock *sk;
      struct udphdr *uh;
      struct net_device *dev = skb->dev;
      struct in6_addr *saddr, *daddr;
      u32 ulen = 0;

      if (!pskb_may_pull(skb, sizeof(struct udphdr)))
            goto short_packet;

      saddr = &ipv6_hdr(skb)->saddr;
      daddr = &ipv6_hdr(skb)->daddr;
      uh = udp_hdr(skb);

      ulen = ntohs(uh->len);
      if (ulen > skb->len)
            goto short_packet;

      if (proto == IPPROTO_UDP) {
            /* UDP validates ulen. */

            /* Check for jumbo payload */
            if (ulen == 0)
                  ulen = skb->len;

            if (ulen < sizeof(*uh))
                  goto short_packet;

            if (ulen < skb->len) {
                  if (pskb_trim_rcsum(skb, ulen))
                        goto short_packet;
                  saddr = &ipv6_hdr(skb)->saddr;
                  daddr = &ipv6_hdr(skb)->daddr;
                  uh = udp_hdr(skb);
            }
      }

      if (udp6_csum_init(skb, uh, proto))
            goto discard;

      /*
       *    Multicast receive code
       */
      if (ipv6_addr_is_multicast(daddr))
            return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable);

      /* Unicast */

      /*
       * check socket cache ... must talk to Alan about his plans
       * for sock caches... i'll skip this for now.
       */
      sk = __udp6_lib_lookup(saddr, uh->source,
                         daddr, uh->dest, inet6_iif(skb), udptable);

      if (sk == NULL) {
            if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
                  goto discard;

            if (udp_lib_checksum_complete(skb))
                  goto discard;
            UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);

            icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);

            kfree_skb(skb);
            return 0;
      }

      /* deliver */

      udpv6_queue_rcv_skb(sk, skb);
      sock_put(sk);
      return 0;

short_packet:
      LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
                   proto == IPPROTO_UDPLITE ? "-Lite" : "",
                   ulen, skb->len);

discard:
      UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
      kfree_skb(skb);
      return 0;
}

static __inline__ int udpv6_rcv(struct sk_buff *skb)
{
      return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP);
}

/*
 * Throw away all pending data and cancel the corking. Socket is locked.
 */
static void udp_v6_flush_pending_frames(struct sock *sk)
{
      struct udp_sock *up = udp_sk(sk);

      if (up->pending) {
            up->len = 0;
            up->pending = 0;
            ip6_flush_pending_frames(sk);
      }
}

/*
 *    Sending
 */

static int udp_v6_push_pending_frames(struct sock *sk)
{
      struct sk_buff *skb;
      struct udphdr *uh;
      struct udp_sock  *up = udp_sk(sk);
      struct inet_sock *inet = inet_sk(sk);
      struct flowi *fl = &inet->cork.fl;
      int err = 0;
      __wsum csum = 0;

      /* Grab the skbuff where UDP header space exists. */
      if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
            goto out;

      /*
       * Create a UDP header
       */
      uh = udp_hdr(skb);
      uh->source = fl->fl_ip_sport;
      uh->dest = fl->fl_ip_dport;
      uh->len = htons(up->len);
      uh->check = 0;

      if (up->pcflag)
            csum = udplite_csum_outgoing(sk, skb);
       else
            csum = udp_csum_outgoing(sk, skb);

      /* add protocol-dependent pseudo-header */
      uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst,
                            up->len, fl->proto, csum   );
      if (uh->check == 0)
            uh->check = CSUM_MANGLED_0;

      err = ip6_push_pending_frames(sk);
out:
      up->len = 0;
      up->pending = 0;
      if (!err)
            UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, up->pcflag);
      return err;
}

int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
              struct msghdr *msg, size_t len)
{
      struct ipv6_txoptions opt_space;
      struct udp_sock *up = udp_sk(sk);
      struct inet_sock *inet = inet_sk(sk);
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
      struct in6_addr *daddr, *final_p = NULL, final;
      struct ipv6_txoptions *opt = NULL;
      struct ip6_flowlabel *flowlabel = NULL;
      struct flowi fl;
      struct dst_entry *dst;
      int addr_len = msg->msg_namelen;
      int ulen = len;
      int hlimit = -1;
      int tclass = -1;
      int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
      int err;
      int connected = 0;
      int is_udplite = up->pcflag;
      int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);

      /* destination address check */
      if (sin6) {
            if (addr_len < offsetof(struct sockaddr, sa_data))
                  return -EINVAL;

            switch (sin6->sin6_family) {
            case AF_INET6:
                  if (addr_len < SIN6_LEN_RFC2133)
                        return -EINVAL;
                  daddr = &sin6->sin6_addr;
                  break;
            case AF_INET:
                  goto do_udp_sendmsg;
            case AF_UNSPEC:
                  msg->msg_name = sin6 = NULL;
                  msg->msg_namelen = addr_len = 0;
                  daddr = NULL;
                  break;
            default:
                  return -EINVAL;
            }
      } else if (!up->pending) {
            if (sk->sk_state != TCP_ESTABLISHED)
                  return -EDESTADDRREQ;
            daddr = &np->daddr;
      } else
            daddr = NULL;

      if (daddr) {
            if (ipv6_addr_v4mapped(daddr)) {
                  struct sockaddr_in sin;
                  sin.sin_family = AF_INET;
                  sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
                  sin.sin_addr.s_addr = daddr->s6_addr32[3];
                  msg->msg_name = &sin;
                  msg->msg_namelen = sizeof(sin);
do_udp_sendmsg:
                  if (__ipv6_only_sock(sk))
                        return -ENETUNREACH;
                  return udp_sendmsg(iocb, sk, msg, len);
            }
      }

      if (up->pending == AF_INET)
            return udp_sendmsg(iocb, sk, msg, len);

      /* Rough check on arithmetic overflow,
         better check is made in ip6_append_data().
         */
      if (len > INT_MAX - sizeof(struct udphdr))
            return -EMSGSIZE;

      if (up->pending) {
            /*
             * There are pending frames.
             * The socket lock must be held while it's corked.
             */
            lock_sock(sk);
            if (likely(up->pending)) {
                  if (unlikely(up->pending != AF_INET6)) {
                        release_sock(sk);
                        return -EAFNOSUPPORT;
                  }
                  dst = NULL;
                  goto do_append_data;
            }
            release_sock(sk);
      }
      ulen += sizeof(struct udphdr);

      memset(&fl, 0, sizeof(fl));

      if (sin6) {
            if (sin6->sin6_port == 0)
                  return -EINVAL;

            fl.fl_ip_dport = sin6->sin6_port;
            daddr = &sin6->sin6_addr;

            if (np->sndflow) {
                  fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
                  if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
                        flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
                        if (flowlabel == NULL)
                              return -EINVAL;
                        daddr = &flowlabel->dst;
                  }
            }

            /*
             * Otherwise it will be difficult to maintain
             * sk->sk_dst_cache.
             */
            if (sk->sk_state == TCP_ESTABLISHED &&
                ipv6_addr_equal(daddr, &np->daddr))
                  daddr = &np->daddr;

            if (addr_len >= sizeof(struct sockaddr_in6) &&
                sin6->sin6_scope_id &&
                ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
                  fl.oif = sin6->sin6_scope_id;
      } else {
            if (sk->sk_state != TCP_ESTABLISHED)
                  return -EDESTADDRREQ;

            fl.fl_ip_dport = inet->dport;
            daddr = &np->daddr;
            fl.fl6_flowlabel = np->flow_label;
            connected = 1;
      }

      if (!fl.oif)
            fl.oif = sk->sk_bound_dev_if;

      if (msg->msg_controllen) {
            opt = &opt_space;
            memset(opt, 0, sizeof(struct ipv6_txoptions));
            opt->tot_len = sizeof(*opt);

            err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
            if (err < 0) {
                  fl6_sock_release(flowlabel);
                  return err;
            }
            if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
                  flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
                  if (flowlabel == NULL)
                        return -EINVAL;
            }
            if (!(opt->opt_nflen|opt->opt_flen))
                  opt = NULL;
            connected = 0;
      }
      if (opt == NULL)
            opt = np->opt;
      if (flowlabel)
            opt = fl6_merge_options(&opt_space, flowlabel, opt);
      opt = ipv6_fixup_options(&opt_space, opt);

      fl.proto = sk->sk_protocol;
      ipv6_addr_copy(&fl.fl6_dst, daddr);
      if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
            ipv6_addr_copy(&fl.fl6_src, &np->saddr);
      fl.fl_ip_sport = inet->sport;

      /* merge ip6_build_xmit from ip6_output */
      if (opt && opt->srcrt) {
            struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
            ipv6_addr_copy(&final, &fl.fl6_dst);
            ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
            final_p = &final;
            connected = 0;
      }

      if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) {
            fl.oif = np->mcast_oif;
            connected = 0;
      }

      security_sk_classify_flow(sk, &fl);

      err = ip6_sk_dst_lookup(sk, &dst, &fl);
      if (err)
            goto out;
      if (final_p)
            ipv6_addr_copy(&fl.fl6_dst, final_p);

      if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
            if (err == -EREMOTE)
                  err = ip6_dst_blackhole(sk, &dst, &fl);
            if (err < 0)
                  goto out;
      }

      if (hlimit < 0) {
            if (ipv6_addr_is_multicast(&fl.fl6_dst))
                  hlimit = np->mcast_hops;
            else
                  hlimit = np->hop_limit;
            if (hlimit < 0)
                  hlimit = dst_metric(dst, RTAX_HOPLIMIT);
            if (hlimit < 0)
                  hlimit = ipv6_get_hoplimit(dst->dev);
      }

      if (tclass < 0) {
            tclass = np->tclass;
            if (tclass < 0)
                  tclass = 0;
      }

      if (msg->msg_flags&MSG_CONFIRM)
            goto do_confirm;
back_from_confirm:

      lock_sock(sk);
      if (unlikely(up->pending)) {
            /* The socket is already corked while preparing it. */
            /* ... which is an evident application bug. --ANK */
            release_sock(sk);

            LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
            err = -EINVAL;
            goto out;
      }

      up->pending = AF_INET6;

do_append_data:
      up->len += ulen;
      getfrag  =  is_udplite ?  udplite_getfrag : ip_generic_getfrag;
      err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
            sizeof(struct udphdr), hlimit, tclass, opt, &fl,
            (struct rt6_info*)dst,
            corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
      if (err)
            udp_v6_flush_pending_frames(sk);
      else if (!corkreq)
            err = udp_v6_push_pending_frames(sk);
      else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
            up->pending = 0;

      if (dst) {
            if (connected) {
                  ip6_dst_store(sk, dst,
                              ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
                              &np->daddr : NULL,
#ifdef CONFIG_IPV6_SUBTREES
                              ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
                              &np->saddr :
#endif
                              NULL);
            } else {
                  dst_release(dst);
            }
      }

      if (err > 0)
            err = np->recverr ? net_xmit_errno(err) : 0;
      release_sock(sk);
out:
      fl6_sock_release(flowlabel);
      if (!err)
            return len;
      /*
       * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space.  Reporting
       * ENOBUFS might not be good (it's not tunable per se), but otherwise
       * we don't have a good statistic (IpOutDiscards but it can be too many
       * things).  We could add another new stat but at least for now that
       * seems like overkill.
       */
      if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
            UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
      }
      return err;

do_confirm:
      dst_confirm(dst);
      if (!(msg->msg_flags&MSG_PROBE) || len)
            goto back_from_confirm;
      err = 0;
      goto out;
}

int udpv6_destroy_sock(struct sock *sk)
{
      lock_sock(sk);
      udp_v6_flush_pending_frames(sk);
      release_sock(sk);

      inet6_destroy_sock(sk);

      return 0;
}

/*
 *    Socket option code for UDP
 */
int udpv6_setsockopt(struct sock *sk, int level, int optname,
                 char __user *optval, int optlen)
{
      if (level == SOL_UDP  ||  level == SOL_UDPLITE)
            return udp_lib_setsockopt(sk, level, optname, optval, optlen,
                                udp_v6_push_pending_frames);
      return ipv6_setsockopt(sk, level, optname, optval, optlen);
}

#ifdef CONFIG_COMPAT
int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
                      char __user *optval, int optlen)
{
      if (level == SOL_UDP  ||  level == SOL_UDPLITE)
            return udp_lib_setsockopt(sk, level, optname, optval, optlen,
                                udp_v6_push_pending_frames);
      return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
}
#endif

int udpv6_getsockopt(struct sock *sk, int level, int optname,
                 char __user *optval, int __user *optlen)
{
      if (level == SOL_UDP  ||  level == SOL_UDPLITE)
            return udp_lib_getsockopt(sk, level, optname, optval, optlen);
      return ipv6_getsockopt(sk, level, optname, optval, optlen);
}

#ifdef CONFIG_COMPAT
int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
                      char __user *optval, int __user *optlen)
{
      if (level == SOL_UDP  ||  level == SOL_UDPLITE)
            return udp_lib_getsockopt(sk, level, optname, optval, optlen);
      return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
}
#endif

static struct inet6_protocol udpv6_protocol = {
      .handler    =     udpv6_rcv,
      .err_handler      =     udpv6_err,
      .flags            =     INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};

/* ------------------------------------------------------------------------ */
#ifdef CONFIG_PROC_FS

static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
{
      struct inet_sock *inet = inet_sk(sp);
      struct ipv6_pinfo *np = inet6_sk(sp);
      struct in6_addr *dest, *src;
      __u16 destp, srcp;

      dest  = &np->daddr;
      src   = &np->rcv_saddr;
      destp = ntohs(inet->dport);
      srcp  = ntohs(inet->sport);
      seq_printf(seq,
               "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
               "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
               bucket,
               src->s6_addr32[0], src->s6_addr32[1],
               src->s6_addr32[2], src->s6_addr32[3], srcp,
               dest->s6_addr32[0], dest->s6_addr32[1],
               dest->s6_addr32[2], dest->s6_addr32[3], destp,
               sp->sk_state,
               atomic_read(&sp->sk_wmem_alloc),
               atomic_read(&sp->sk_rmem_alloc),
               0, 0L, 0,
               sock_i_uid(sp), 0,
               sock_i_ino(sp),
               atomic_read(&sp->sk_refcnt), sp);
}

int udp6_seq_show(struct seq_file *seq, void *v)
{
      if (v == SEQ_START_TOKEN)
            seq_printf(seq,
                     "  sl  "
                     "local_address                         "
                     "remote_address                        "
                     "st tx_queue rx_queue tr tm->when retrnsmt"
                     "   uid  timeout inode\n");
      else
            udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
      return 0;
}

static struct file_operations udp6_seq_fops;
static struct udp_seq_afinfo udp6_seq_afinfo = {
      .owner            = THIS_MODULE,
      .name       = "udp6",
      .family           = AF_INET6,
      .hashtable  = udp_hash,
      .seq_show   = udp6_seq_show,
      .seq_fops   = &udp6_seq_fops,
};

int __init udp6_proc_init(void)
{
      return udp_proc_register(&udp6_seq_afinfo);
}

void udp6_proc_exit(void) {
      udp_proc_unregister(&udp6_seq_afinfo);
}
#endif /* CONFIG_PROC_FS */

/* ------------------------------------------------------------------------ */

DEFINE_PROTO_INUSE(udpv6)

struct proto udpv6_prot = {
      .name          = "UDPv6",
      .owner               = THIS_MODULE,
      .close               = udp_lib_close,
      .connect       = ip6_datagram_connect,
      .disconnect    = udp_disconnect,
      .ioctl               = udp_ioctl,
      .destroy       = udpv6_destroy_sock,
      .setsockopt    = udpv6_setsockopt,
      .getsockopt    = udpv6_getsockopt,
      .sendmsg       = udpv6_sendmsg,
      .recvmsg       = udpv6_recvmsg,
      .backlog_rcv         = udpv6_queue_rcv_skb,
      .hash          = udp_lib_hash,
      .unhash              = udp_lib_unhash,
      .get_port      = udp_v6_get_port,
      .obj_size      = sizeof(struct udp6_sock),
#ifdef CONFIG_COMPAT
      .compat_setsockopt = compat_udpv6_setsockopt,
      .compat_getsockopt = compat_udpv6_getsockopt,
#endif
      REF_PROTO_INUSE(udpv6)
};

static struct inet_protosw udpv6_protosw = {
      .type =      SOCK_DGRAM,
      .protocol =  IPPROTO_UDP,
      .prot =      &udpv6_prot,
      .ops =       &inet6_dgram_ops,
      .capability =-1,
      .no_check =  UDP_CSUM_DEFAULT,
      .flags =     INET_PROTOSW_PERMANENT,
};


void __init udpv6_init(void)
{
      if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
            printk(KERN_ERR "udpv6_init: Could not register protocol\n");
      inet6_register_protosw(&udpv6_protosw);
}

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