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-rw-r--r--net/xfrm/xfrm_state.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 9d206c282cf1..8b9a4747417d 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1026,6 +1026,12 @@ void xfrm_state_delete_tunnel(struct xfrm_state *x)
}
EXPORT_SYMBOL(xfrm_state_delete_tunnel);
+/*
+ * This function is NOT optimal. For example, with ESP it will give an
+ * MTU that's usually two bytes short of being optimal. However, it will
+ * usually give an answer that's a multiple of 4 provided the input is
+ * also a multiple of 4.
+ */
int xfrm_state_mtu(struct xfrm_state *x, int mtu)
{
int res = mtu;