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Commit 9af3912e authored by John Heffner's avatar John Heffner Committed by David S. Miller
Browse files

[NET] Move DF check to ip_forward 



Do fragmentation check in ip_forward, similar to ipv6 forwarding.

Signed-off-by: default avatarJohn Heffner <jheffner@psc.edu>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b3da2cf3

net/ipv4/ip_forward.c

+8 −0
Original line number Diff line number Diff line
@@ -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;