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lwtunnel: subtract tunnel headroom from mtu on output redirect

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This patch changes the lwtunnel_headroom() function which is called
in ipv4_mtu() and ip6_mtu(), to also return the correct headroom
value when the lwtunnel state is OUTPUT_REDIRECT.

This patch enables e.g. SR-IPv6 encapsulations to work without
manually setting the route mtu.

Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Lebrun 2016-11-16 10:05:46 +01:00 committed by David S. Miller
parent d331d30360
commit a23a8f5bc1
1 changed files with 2 additions and 1 deletions
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3
include/net/lwtunnel.h
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@ -94,7 +94,8 @@ static inline bool lwtunnel_xmit_redirect(struct lwtunnel_state *lwtstate)
static inline unsigned int lwtunnel_headroom(struct lwtunnel_state *lwtstate,
unsigned int mtu)
{
if (lwtunnel_xmit_redirect(lwtstate) && lwtstate->headroom < mtu)
if ((lwtunnel_xmit_redirect(lwtstate) ||
lwtunnel_output_redirect(lwtstate)) && lwtstate->headroom < mtu)
return lwtstate->headroom;
return 0;