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authorJohn Heffner <jheffner@psc.edu>2007-03-25 23:32:29 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:28:07 -0700
commit9af3912ec9e30509b76cb376abb65a4d8af27df3 (patch)
treed640cf87254d86ed6f0a862460d85029573763a5
parentb3da2cf37c5c6e47698957a25ab43a7223dbb90f (diff)
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[NET] Move DF check to ip_forward
Do fragmentation check in ip_forward, similar to ipv6 forwarding. Signed-off-by: John Heffner <jheffner@psc.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/ip_forward.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c
index 467ebedb99b..61b30d10067 100644
--- a/net/ipv4/ip_forward.c
+++ b/net/ipv4/ip_forward.c
@@ -85,6 +85,14 @@ int ip_forward(struct sk_buff *skb)
if (opt->is_strictroute && rt->rt_dst != rt->rt_gateway)
goto sr_failed;
+ if (unlikely(skb->len > dst_mtu(&rt->u.dst) &&
+ (ip_hdr(skb)->frag_off & htons(IP_DF))) && !skb->local_df) {
+ IP_INC_STATS(IPSTATS_MIB_FRAGFAILS);
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
+ htonl(dst_mtu(&rt->u.dst)));
+ goto drop;
+ }
+
/* We are about to mangle packet. Copy it! */
if (skb_cow(skb, LL_RESERVED_SPACE(rt->u.dst.dev)+rt->u.dst.header_len))
goto drop;