Commit 239c78db authored Dec 05, 2013 by Hannes Frederic Sowa Committed by David S. Miller Dec 05, 2013

net: clear local_df when passing skb between namespaces



We must clear local_df when passing the skb between namespaces as the
packet is not local to the new namespace any more and thus may not get
fragmented by local rules. Fred Templin noticed that other namespaces
do fragment IPv6 packets while forwarding. Instead they should have send
back a PTB.

The same problem should be present when forwarding DF-IPv4 packets
between namespaces.

Reported-by: Templin, Fred L <Fred.L.Templin@boeing.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 7f2cbdc2

net/core/skbuff.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -3584,6 +3584,7 @@ void skb_scrub_packet(struct sk_buff *skb, bool xnet)
		skb->tstamp.tv64 = 0;
		skb->pkt_type = PACKET_HOST;
		skb->skb_iif = 0;
		skb->local_df = 0;
		skb_dst_drop(skb);
		skb->mark = 0;
		secpath_reset(skb);

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