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raw.c

/*
 *    RAW sockets for IPv6
 *    Linux INET6 implementation
 *
 *    Authors:
 *    Pedro Roque       <roque@di.fc.ul.pt>
 *
 *    Adapted from linux/net/ipv4/raw.c
 *
 *    $Id: raw.c,v 1.51 2002/02/01 22:01:04 davem Exp $
 *
 *    Fixes:
 *    Hideaki YOSHIFUJI :     sin6_scope_id support
 *    YOSHIFUJI,H.@USAGI      :     raw checksum (RFC2292(bis) compliance)
 *    Kazunori MIYAZAWA @USAGI:     change process style to use ip6_append_data
 *
 *    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/icmpv6.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
#include <linux/skbuff.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>

#include <net/net_namespace.h>
#include <net/ip.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/ip6_checksum.h>
#include <net/addrconf.h>
#include <net/transp_v6.h>
#include <net/udp.h>
#include <net/inet_common.h>
#include <net/tcp_states.h>
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
#include <net/mip6.h>
#endif

#include <net/rawv6.h>
#include <net/xfrm.h>

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

struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE];
DEFINE_RWLOCK(raw_v6_lock);

static void raw_v6_hash(struct sock *sk)
{
      struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num &
                                     (RAWV6_HTABLE_SIZE - 1)];

      write_lock_bh(&raw_v6_lock);
      sk_add_node(sk, list);
      sock_prot_inc_use(sk->sk_prot);
      write_unlock_bh(&raw_v6_lock);
}

static void raw_v6_unhash(struct sock *sk)
{
      write_lock_bh(&raw_v6_lock);
      if (sk_del_node_init(sk))
            sock_prot_dec_use(sk->sk_prot);
      write_unlock_bh(&raw_v6_lock);
}


/* Grumble... icmp and ip_input want to get at this... */
struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
                       struct in6_addr *loc_addr, struct in6_addr *rmt_addr,
                       int dif)
{
      struct hlist_node *node;
      int is_multicast = ipv6_addr_is_multicast(loc_addr);

      sk_for_each_from(sk, node)
            if (inet_sk(sk)->num == num) {
                  struct ipv6_pinfo *np = inet6_sk(sk);

                  if (!ipv6_addr_any(&np->daddr) &&
                      !ipv6_addr_equal(&np->daddr, rmt_addr))
                        continue;

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

                  if (!ipv6_addr_any(&np->rcv_saddr)) {
                        if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
                              goto found;
                        if (is_multicast &&
                            inet6_mc_check(sk, loc_addr, rmt_addr))
                              goto found;
                        continue;
                  }
                  goto found;
            }
      sk = NULL;
found:
      return sk;
}

/*
 *    0 - deliver
 *    1 - block
 */
static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
{
      struct icmp6hdr *icmph;
      struct raw6_sock *rp = raw6_sk(sk);

      if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
            __u32 *data = &rp->filter.data[0];
            int bit_nr;

            icmph = (struct icmp6hdr *) skb->data;
            bit_nr = icmph->icmp6_type;

            return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
      }
      return 0;
}

#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
static int (*mh_filter)(struct sock *sock, struct sk_buff *skb);

int rawv6_mh_filter_register(int (*filter)(struct sock *sock,
                                 struct sk_buff *skb))
{
      rcu_assign_pointer(mh_filter, filter);
      return 0;
}
EXPORT_SYMBOL(rawv6_mh_filter_register);

int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock,
                                   struct sk_buff *skb))
{
      rcu_assign_pointer(mh_filter, NULL);
      synchronize_rcu();
      return 0;
}
EXPORT_SYMBOL(rawv6_mh_filter_unregister);

#endif

/*
 *    demultiplex raw sockets.
 *    (should consider queueing the skb in the sock receive_queue
 *    without calling rawv6.c)
 *
 *    Caller owns SKB so we must make clones.
 */
int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
{
      struct in6_addr *saddr;
      struct in6_addr *daddr;
      struct sock *sk;
      int delivered = 0;
      __u8 hash;

      saddr = &ipv6_hdr(skb)->saddr;
      daddr = saddr + 1;

      hash = nexthdr & (MAX_INET_PROTOS - 1);

      read_lock(&raw_v6_lock);
      sk = sk_head(&raw_v6_htable[hash]);

      /*
       *    The first socket found will be delivered after
       *    delivery to transport protocols.
       */

      if (sk == NULL)
            goto out;

      sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);

      while (sk) {
            int filtered;

            delivered = 1;
            switch (nexthdr) {
            case IPPROTO_ICMPV6:
                  filtered = icmpv6_filter(sk, skb);
                  break;

#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
            case IPPROTO_MH:
            {
                  /* XXX: To validate MH only once for each packet,
                   * this is placed here. It should be after checking
                   * xfrm policy, however it doesn't. The checking xfrm
                   * policy is placed in rawv6_rcv() because it is
                   * required for each socket.
                   */
                  int (*filter)(struct sock *sock, struct sk_buff *skb);

                  filter = rcu_dereference(mh_filter);
                  filtered = filter ? filter(sk, skb) : 0;
                  break;
            }
#endif
            default:
                  filtered = 0;
                  break;
            }

            if (filtered < 0)
                  break;
            if (filtered == 0) {
                  struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);

                  /* Not releasing hash table! */
                  if (clone) {
                        nf_reset(clone);
                        rawv6_rcv(sk, clone);
                  }
            }
            sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr,
                             IP6CB(skb)->iif);
      }
out:
      read_unlock(&raw_v6_lock);
      return delivered;
}

/* This cleans up af_inet6 a bit. -DaveM */
static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
      struct inet_sock *inet = inet_sk(sk);
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
      __be32 v4addr = 0;
      int addr_type;
      int err;

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

      /* Raw sockets are IPv6 only */
      if (addr_type == IPV6_ADDR_MAPPED)
            return(-EADDRNOTAVAIL);

      lock_sock(sk);

      err = -EINVAL;
      if (sk->sk_state != TCP_CLOSE)
            goto out;

      /* Check if the address belongs to the host. */
      if (addr_type != IPV6_ADDR_ANY) {
            struct net_device *dev = NULL;

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

                  /* Binding to link-local address requires an interface */
                  if (!sk->sk_bound_dev_if)
                        goto out;

                  dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
                  if (!dev) {
                        err = -ENODEV;
                        goto out;
                  }
            }

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

      inet->rcv_saddr = inet->saddr = v4addr;
      ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
      if (!(addr_type & IPV6_ADDR_MULTICAST))
            ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
      err = 0;
out:
      release_sock(sk);
      return err;
}

void rawv6_err(struct sock *sk, struct sk_buff *skb,
             struct inet6_skb_parm *opt,
             int type, int code, int offset, __be32 info)
{
      struct inet_sock *inet = inet_sk(sk);
      struct ipv6_pinfo *np = inet6_sk(sk);
      int err;
      int harderr;

      /* Report error on raw socket, if:
         1. User requested recverr.
         2. Socket is connected (otherwise the error indication
            is useless without recverr and error is hard.
       */
      if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
            return;

      harderr = icmpv6_err_convert(type, code, &err);
      if (type == ICMPV6_PKT_TOOBIG)
            harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);

      if (np->recverr) {
            u8 *payload = skb->data;
            if (!inet->hdrincl)
                  payload += offset;
            ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
      }

      if (np->recverr || harderr) {
            sk->sk_err = err;
            sk->sk_error_report(sk);
      }
}

static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
{
      if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
          skb_checksum_complete(skb)) {
            /* FIXME: increment a raw6 drops counter here */
            kfree_skb(skb);
            return 0;
      }

      /* Charge it to the socket. */
      if (sock_queue_rcv_skb(sk,skb)<0) {
            /* FIXME: increment a raw6 drops counter here */
            kfree_skb(skb);
            return 0;
      }

      return 0;
}

/*
 *    This is next to useless...
 *    if we demultiplex in network layer we don't need the extra call
 *    just to queue the skb...
 *    maybe we could have the network decide upon a hint if it
 *    should call raw_rcv for demultiplexing
 */
int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
{
      struct inet_sock *inet = inet_sk(sk);
      struct raw6_sock *rp = raw6_sk(sk);

      if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
            kfree_skb(skb);
            return NET_RX_DROP;
      }

      if (!rp->checksum)
            skb->ip_summed = CHECKSUM_UNNECESSARY;

      if (skb->ip_summed == CHECKSUM_COMPLETE) {
            skb_postpull_rcsum(skb, skb_network_header(skb),
                           skb_network_header_len(skb));
            if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
                             &ipv6_hdr(skb)->daddr,
                             skb->len, inet->num, 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,
                                           inet->num, 0));

      if (inet->hdrincl) {
            if (skb_checksum_complete(skb)) {
                  /* FIXME: increment a raw6 drops counter here */
                  kfree_skb(skb);
                  return 0;
            }
      }

      rawv6_rcv_skb(sk, skb);
      return 0;
}


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

static int rawv6_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 sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
      struct sk_buff *skb;
      size_t copied;
      int err;

      if (flags & MSG_OOB)
            return -EOPNOTSUPP;

      if (addr_len)
            *addr_len=sizeof(*sin6);

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

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

      copied = skb->len;
      if (copied > len) {
            copied = len;
            msg->msg_flags |= MSG_TRUNC;
      }

      if (skb_csum_unnecessary(skb)) {
            err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
      } else if (msg->msg_flags&MSG_TRUNC) {
            if (__skb_checksum_complete(skb))
                  goto csum_copy_err;
            err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
      } else {
            err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
            if (err == -EINVAL)
                  goto csum_copy_err;
      }
      if (err)
            goto out_free;

      /* Copy the address. */
      if (sin6) {
            sin6->sin6_family = AF_INET6;
            sin6->sin6_port = 0;
            ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
            sin6->sin6_flowinfo = 0;
            sin6->sin6_scope_id = 0;
            if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
                  sin6->sin6_scope_id = IP6CB(skb)->iif;
      }

      sock_recv_timestamp(msg, sk, skb);

      if (np->rxopt.all)
            datagram_recv_ctl(sk, msg, skb);

      err = copied;
      if (flags & MSG_TRUNC)
            err = skb->len;

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

csum_copy_err:
      skb_kill_datagram(sk, skb, flags);

      /* Error for blocking case is chosen to masquerade
         as some normal condition.
       */
      err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
      /* FIXME: increment a raw6 drops counter here */
      goto out;
}

static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
                             struct raw6_sock *rp)
{
      struct sk_buff *skb;
      int err = 0;
      int offset;
      int len;
      int total_len;
      __wsum tmp_csum;
      __sum16 csum;

      if (!rp->checksum)
            goto send;

      if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
            goto out;

      offset = rp->offset;
      total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) -
                                    skb->data);
      if (offset >= total_len - 1) {
            err = -EINVAL;
            ip6_flush_pending_frames(sk);
            goto out;
      }

      /* should be check HW csum miyazawa */
      if (skb_queue_len(&sk->sk_write_queue) == 1) {
            /*
             * Only one fragment on the socket.
             */
            tmp_csum = skb->csum;
      } else {
            struct sk_buff *csum_skb = NULL;
            tmp_csum = 0;

            skb_queue_walk(&sk->sk_write_queue, skb) {
                  tmp_csum = csum_add(tmp_csum, skb->csum);

                  if (csum_skb)
                        continue;

                  len = skb->len - skb_transport_offset(skb);
                  if (offset >= len) {
                        offset -= len;
                        continue;
                  }

                  csum_skb = skb;
            }

            skb = csum_skb;
      }

      offset += skb_transport_offset(skb);
      if (skb_copy_bits(skb, offset, &csum, 2))
            BUG();

      /* in case cksum was not initialized */
      if (unlikely(csum))
            tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));

      csum = csum_ipv6_magic(&fl->fl6_src,
                           &fl->fl6_dst,
                           total_len, fl->proto, tmp_csum);

      if (csum == 0 && fl->proto == IPPROTO_UDP)
            csum = CSUM_MANGLED_0;

      if (skb_store_bits(skb, offset, &csum, 2))
            BUG();

send:
      err = ip6_push_pending_frames(sk);
out:
      return err;
}

static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
                  struct flowi *fl, struct rt6_info *rt,
                  unsigned int flags)
{
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct ipv6hdr *iph;
      struct sk_buff *skb;
      unsigned int hh_len;
      int err;

      if (length > rt->u.dst.dev->mtu) {
            ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
            return -EMSGSIZE;
      }
      if (flags&MSG_PROBE)
            goto out;

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

      skb = sock_alloc_send_skb(sk, length+hh_len+15,
                          flags&MSG_DONTWAIT, &err);
      if (skb == NULL)
            goto error;
      skb_reserve(skb, hh_len);

      skb->priority = sk->sk_priority;
      skb->dst = dst_clone(&rt->u.dst);

      skb_put(skb, length);
      skb_reset_network_header(skb);
      iph = ipv6_hdr(skb);

      skb->ip_summed = CHECKSUM_NONE;

      skb->transport_header = skb->network_header;
      err = memcpy_fromiovecend((void *)iph, from, 0, length);
      if (err)
            goto error_fault;

      IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
      err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
                  dst_output);
      if (err > 0)
            err = np->recverr ? net_xmit_errno(err) : 0;
      if (err)
            goto error;
out:
      return 0;

error_fault:
      err = -EFAULT;
      kfree_skb(skb);
error:
      IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
      return err;
}

static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
{
      struct iovec *iov;
      u8 __user *type = NULL;
      u8 __user *code = NULL;
      u8 len = 0;
      int probed = 0;
      int i;

      if (!msg->msg_iov)
            return 0;

      for (i = 0; i < msg->msg_iovlen; i++) {
            iov = &msg->msg_iov[i];
            if (!iov)
                  continue;

            switch (fl->proto) {
            case IPPROTO_ICMPV6:
                  /* check if one-byte field is readable or not. */
                  if (iov->iov_base && iov->iov_len < 1)
                        break;

                  if (!type) {
                        type = iov->iov_base;
                        /* check if code field is readable or not. */
                        if (iov->iov_len > 1)
                              code = type + 1;
                  } else if (!code)
                        code = iov->iov_base;

                  if (type && code) {
                        if (get_user(fl->fl_icmp_type, type) ||
                            get_user(fl->fl_icmp_code, code))
                              return -EFAULT;
                        probed = 1;
                  }
                  break;
            case IPPROTO_MH:
                  if (iov->iov_base && iov->iov_len < 1)
                        break;
                  /* check if type field is readable or not. */
                  if (iov->iov_len > 2 - len) {
                        u8 __user *p = iov->iov_base;
                        if (get_user(fl->fl_mh_type, &p[2 - len]))
                              return -EFAULT;
                        probed = 1;
                  } else
                        len += iov->iov_len;

                  break;
            default:
                  probed = 1;
                  break;
            }
            if (probed)
                  break;
      }
      return 0;
}

static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
               struct msghdr *msg, size_t len)
{
      struct ipv6_txoptions opt_space;
      struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
      struct in6_addr *daddr, *final_p = NULL, final;
      struct inet_sock *inet = inet_sk(sk);
      struct ipv6_pinfo *np = inet6_sk(sk);
      struct raw6_sock *rp = raw6_sk(sk);
      struct ipv6_txoptions *opt = NULL;
      struct ip6_flowlabel *flowlabel = NULL;
      struct dst_entry *dst = NULL;
      struct flowi fl;
      int addr_len = msg->msg_namelen;
      int hlimit = -1;
      int tclass = -1;
      u16 proto;
      int err;

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

      /* Mirror BSD error message compatibility */
      if (msg->msg_flags & MSG_OOB)
            return -EOPNOTSUPP;

      /*
       *    Get and verify the address.
       */
      memset(&fl, 0, sizeof(fl));

      if (sin6) {
            if (addr_len < SIN6_LEN_RFC2133)
                  return -EINVAL;

            if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
                  return(-EAFNOSUPPORT);

            /* port is the proto value [0..255] carried in nexthdr */
            proto = ntohs(sin6->sin6_port);

            if (!proto)
                  proto = inet->num;
            else if (proto != inet->num)
                  return(-EINVAL);

            if (proto > 255)
                  return(-EINVAL);

            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;

            proto = inet->num;
            daddr = &np->daddr;
            fl.fl6_flowlabel = np->flow_label;
      }

      if (ipv6_addr_any(daddr)) {
            /*
             * unspecified destination address
             * treated as error... is this correct ?
             */
            fl6_sock_release(flowlabel);
            return(-EINVAL);
      }

      if (fl.oif == 0)
            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(struct ipv6_txoptions);

            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;
      }
      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 = proto;
      err = rawv6_probe_proto_opt(&fl, msg);
      if (err)
            goto out;

      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);

      /* 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;
      }

      if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
            fl.oif = np->mcast_oif;
      security_sk_classify_flow(sk, &fl);

      err = ip6_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:
      if (inet->hdrincl) {
            err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
      } else {
            lock_sock(sk);
            err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
                  len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
                  msg->msg_flags);

            if (err)
                  ip6_flush_pending_frames(sk);
            else if (!(msg->msg_flags & MSG_MORE))
                  err = rawv6_push_pending_frames(sk, &fl, rp);
            release_sock(sk);
      }
done:
      dst_release(dst);
out:
      fl6_sock_release(flowlabel);
      return err<0?err:len;
do_confirm:
      dst_confirm(dst);
      if (!(msg->msg_flags & MSG_PROBE) || len)
            goto back_from_confirm;
      err = 0;
      goto done;
}

static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
                         char __user *optval, int optlen)
{
      switch (optname) {
      case ICMPV6_FILTER:
            if (optlen > sizeof(struct icmp6_filter))
                  optlen = sizeof(struct icmp6_filter);
            if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
                  return -EFAULT;
            return 0;
      default:
            return -ENOPROTOOPT;
      }

      return 0;
}

static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
                         char __user *optval, int __user *optlen)
{
      int len;

      switch (optname) {
      case ICMPV6_FILTER:
            if (get_user(len, optlen))
                  return -EFAULT;
            if (len < 0)
                  return -EINVAL;
            if (len > sizeof(struct icmp6_filter))
                  len = sizeof(struct icmp6_filter);
            if (put_user(len, optlen))
                  return -EFAULT;
            if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
                  return -EFAULT;
            return 0;
      default:
            return -ENOPROTOOPT;
      }

      return 0;
}


static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
                      char __user *optval, int optlen)
{
      struct raw6_sock *rp = raw6_sk(sk);
      int val;

      if (get_user(val, (int __user *)optval))
            return -EFAULT;

      switch (optname) {
            case IPV6_CHECKSUM:
                  /* You may get strange result with a positive odd offset;
                     RFC2292bis agrees with me. */
                  if (val > 0 && (val&1))
                        return(-EINVAL);
                  if (val < 0) {
                        rp->checksum = 0;
                  } else {
                        rp->checksum = 1;
                        rp->offset = val;
                  }

                  return 0;
                  break;

            default:
                  return(-ENOPROTOOPT);
      }
}

static int rawv6_setsockopt(struct sock *sk, int level, int optname,
                    char __user *optval, int optlen)
{
      switch(level) {
            case SOL_RAW:
                  break;

            case SOL_ICMPV6:
                  if (inet_sk(sk)->num != IPPROTO_ICMPV6)
                        return -EOPNOTSUPP;
                  return rawv6_seticmpfilter(sk, level, optname, optval,
                                       optlen);
            case SOL_IPV6:
                  if (optname == IPV6_CHECKSUM)
                        break;
            default:
                  return ipv6_setsockopt(sk, level, optname, optval,
                                     optlen);
      }

      return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
}

#ifdef CONFIG_COMPAT
static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
                           char __user *optval, int optlen)
{
      switch (level) {
      case SOL_RAW:
            break;
      case SOL_ICMPV6:
            if (inet_sk(sk)->num != IPPROTO_ICMPV6)
                  return -EOPNOTSUPP;
            return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
      case SOL_IPV6:
            if (optname == IPV6_CHECKSUM)
                  break;
      default:
            return compat_ipv6_setsockopt(sk, level, optname,
                                    optval, optlen);
      }
      return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
}
#endif

static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
                      char __user *optval, int __user *optlen)
{
      struct raw6_sock *rp = raw6_sk(sk);
      int val, len;

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

      switch (optname) {
      case IPV6_CHECKSUM:
            if (rp->checksum == 0)
                  val = -1;
            else
                  val = rp->offset;
            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;
}

static int rawv6_getsockopt(struct sock *sk, int level, int optname,
                    char __user *optval, int __user *optlen)
{
      switch(level) {
            case SOL_RAW:
                  break;

            case SOL_ICMPV6:
                  if (inet_sk(sk)->num != IPPROTO_ICMPV6)
                        return -EOPNOTSUPP;
                  return rawv6_geticmpfilter(sk, level, optname, optval,
                                       optlen);
            case SOL_IPV6:
                  if (optname == IPV6_CHECKSUM)
                        break;
            default:
                  return ipv6_getsockopt(sk, level, optname, optval,
                                     optlen);
      }

      return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
}

#ifdef CONFIG_COMPAT
static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
                           char __user *optval, int __user *optlen)
{
      switch (level) {
      case SOL_RAW:
            break;
      case SOL_ICMPV6:
            if (inet_sk(sk)->num != IPPROTO_ICMPV6)
                  return -EOPNOTSUPP;
            return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
      case SOL_IPV6:
            if (optname == IPV6_CHECKSUM)
                  break;
      default:
            return compat_ipv6_getsockopt(sk, level, optname,
                                    optval, optlen);
      }
      return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
}
#endif

static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
      switch(cmd) {
            case SIOCOUTQ:
            {
                  int amount = atomic_read(&sk->sk_wmem_alloc);
                  return put_user(amount, (int __user *)arg);
            }
            case SIOCINQ:
            {
                  struct sk_buff *skb;
                  int amount = 0;

                  spin_lock_bh(&sk->sk_receive_queue.lock);
                  skb = skb_peek(&sk->sk_receive_queue);
                  if (skb != NULL)
                        amount = skb->tail - skb->transport_header;
                  spin_unlock_bh(&sk->sk_receive_queue.lock);
                  return put_user(amount, (int __user *)arg);
            }

            default:
                  return -ENOIOCTLCMD;
      }
}

static void rawv6_close(struct sock *sk, long timeout)
{
      if (inet_sk(sk)->num == IPPROTO_RAW)
            ip6_ra_control(sk, -1, NULL);

      sk_common_release(sk);
}

static int rawv6_init_sk(struct sock *sk)
{
      struct raw6_sock *rp = raw6_sk(sk);

      switch (inet_sk(sk)->num) {
      case IPPROTO_ICMPV6:
            rp->checksum = 1;
            rp->offset   = 2;
            break;
      case IPPROTO_MH:
            rp->checksum = 1;
            rp->offset   = 4;
            break;
      default:
            break;
      }
      return(0);
}

DEFINE_PROTO_INUSE(rawv6)

struct proto rawv6_prot = {
      .name          = "RAWv6",
      .owner               = THIS_MODULE,
      .close               = rawv6_close,
      .connect       = ip6_datagram_connect,
      .disconnect    = udp_disconnect,
      .ioctl               = rawv6_ioctl,
      .init          = rawv6_init_sk,
      .destroy       = inet6_destroy_sock,
      .setsockopt    = rawv6_setsockopt,
      .getsockopt    = rawv6_getsockopt,
      .sendmsg       = rawv6_sendmsg,
      .recvmsg       = rawv6_recvmsg,
      .bind          = rawv6_bind,
      .backlog_rcv         = rawv6_rcv_skb,
      .hash          = raw_v6_hash,
      .unhash              = raw_v6_unhash,
      .obj_size      = sizeof(struct raw6_sock),
#ifdef CONFIG_COMPAT
      .compat_setsockopt = compat_rawv6_setsockopt,
      .compat_getsockopt = compat_rawv6_getsockopt,
#endif
      REF_PROTO_INUSE(rawv6)
};

#ifdef CONFIG_PROC_FS
struct raw6_iter_state {
      int bucket;
};

#define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private)

static struct sock *raw6_get_first(struct seq_file *seq)
{
      struct sock *sk;
      struct hlist_node *node;
      struct raw6_iter_state* state = raw6_seq_private(seq);

      for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket)
            sk_for_each(sk, node, &raw_v6_htable[state->bucket])
                  if (sk->sk_family == PF_INET6)
                        goto out;
      sk = NULL;
out:
      return sk;
}

static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk)
{
      struct raw6_iter_state* state = raw6_seq_private(seq);

      do {
            sk = sk_next(sk);
try_again:
            ;
      } while (sk && sk->sk_family != PF_INET6);

      if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) {
            sk = sk_head(&raw_v6_htable[state->bucket]);
            goto try_again;
      }
      return sk;
}

static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos)
{
      struct sock *sk = raw6_get_first(seq);
      if (sk)
            while (pos && (sk = raw6_get_next(seq, sk)) != NULL)
                  --pos;
      return pos ? NULL : sk;
}

static void *raw6_seq_start(struct seq_file *seq, loff_t *pos)
{
      read_lock(&raw_v6_lock);
      return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}

static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
      struct sock *sk;

      if (v == SEQ_START_TOKEN)
            sk = raw6_get_first(seq);
      else
            sk = raw6_get_next(seq, v);
      ++*pos;
      return sk;
}

static void raw6_seq_stop(struct seq_file *seq, void *v)
{
      read_unlock(&raw_v6_lock);
}

static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
{
      struct ipv6_pinfo *np = inet6_sk(sp);
      struct in6_addr *dest, *src;
      __u16 destp, srcp;

      dest  = &np->daddr;
      src   = &np->rcv_saddr;
      destp = 0;
      srcp  = inet_sk(sp)->num;
      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",
               i,
               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);
}

static int raw6_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
            raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket);
      return 0;
}

static const struct seq_operations raw6_seq_ops = {
      .start =    raw6_seq_start,
      .next =           raw6_seq_next,
      .stop =           raw6_seq_stop,
      .show =           raw6_seq_show,
};

static int raw6_seq_open(struct inode *inode, struct file *file)
{
      return seq_open_private(file, &raw6_seq_ops,
                  sizeof(struct raw6_iter_state));
}

static const struct file_operations raw6_seq_fops = {
      .owner =    THIS_MODULE,
      .open =           raw6_seq_open,
      .read =           seq_read,
      .llseek =   seq_lseek,
      .release =  seq_release_private,
};

int __init raw6_proc_init(void)
{
      if (!proc_net_fops_create(&init_net, "raw6", S_IRUGO, &raw6_seq_fops))
            return -ENOMEM;
      return 0;
}

void raw6_proc_exit(void)
{
      proc_net_remove(&init_net, "raw6");
}
#endif      /* CONFIG_PROC_FS */

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