Commit 88c4c066 authored Mar 04, 2013 by Zang MingJie Committed by David S. Miller Mar 06, 2013

reset nf before xmit vxlan encapsulated packet



We should reset nf settings bond to the skb as ipip/ipgre do.

If not, the conntrack/nat info bond to the origin packet may continually
redirect the packet to vxlan interface causing a routing loop.

this is the scenario:

     VETP     VXLAN Gateway
    /----\  /---------------\
    |    |  |               |
    |  vx+--+vx --NAT-> eth0+--> Internet
    |    |  |               |
    \----/  \---------------/

when there are any packet coming from internet to the vetp, there will be lots
of garbage packets coming out the gateway's vxlan interface, but none actually
sent to the physical interface, because they are redirected back to the vxlan
interface in the postrouting chain of NAT rule, and dmesg complains:

    Mar  1 21:52:53 debian kernel: [ 8802.997699] Dead loop on virtual device vxlan0, fix it urgently!
    Mar  1 21:52:54 debian kernel: [ 8804.004907] Dead loop on virtual device vxlan0, fix it urgently!
    Mar  1 21:52:55 debian kernel: [ 8805.012189] Dead loop on virtual device vxlan0, fix it urgently!
    Mar  1 21:52:56 debian kernel: [ 8806.020593] Dead loop on virtual device vxlan0, fix it urgently!

the patch should fix the problem

Signed-off-by: Zang MingJie <zealot0630@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 76e4cb0d

drivers/net/vxlan.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -961,6 +961,8 @@ static netdev_tx_t vxlan_xmit(struct sk_buff skb, struct net_device dev)
		iph->ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
		tunnel_ip_select_ident(skb, old_iph, &rt->dst);

		nf_reset(skb);

		vxlan_set_owner(dev, skb);

		/* See iptunnel_xmit() */

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