Commit a23a8f5b authored by David Lebrun's avatar David Lebrun Committed by David S. Miller
Browse files

lwtunnel: subtract tunnel headroom from mtu on output redirect

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: default avatarRoopa Prabhu <>
Signed-off-by: default avatarDavid Lebrun <>
Signed-off-by: default avatarDavid S. Miller <>
parent d331d303
......@@ -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;
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