[IPV4]: Safer reassembly

Another spin of Herbert Xu's "safer ip reassembly" patch
for 2.6.16.

(The original patch is here:
http://marc.theaimsgroup.com/?l=linux-netdev&m=112281936522415&w=2
and my only contribution is to have tested it.)

This patch (optionally) does additional checks before accepting IP
fragments, which can greatly reduce the possibility of reassembling
fragments which originated from different IP datagrams.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Arthur Kepner <akepner@sgi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
index 7fda471002b6..0965515f40cf 100644
--- a/include/net/inetpeer.h
+++ b/include/net/inetpeer.h
@@ -25,6 +25,7 @@ struct inet_peer
         __u32                   v4daddr;        /* peer's address */
         __u16                   avl_height;
         __u16                   ip_id_count;    /* IP ID for the next packet */
+        atomic_t                rid;            /* Frag reception counter */
         __u32                   tcp_ts;
         unsigned long           tcp_ts_stamp;
 };