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authorStefano Brivio <sbrivio@redhat.com>2018-10-12 23:53:59 +0200
committerDavid S. Miller <davem@davemloft.net>2018-10-17 21:51:13 -0700
commit6b4f92af3d59e882d3ba04c44a815266890d188f (patch)
tree8446305611f6d7e76b1470f1ca91f8bdb822b7bf /include
parent7463e4f9b99c089cc962033b46349ff29f466e40 (diff)
geneve, vxlan: Don't set exceptions if skb->len < mtu
We shouldn't abuse exceptions: if the destination MTU is already higher than what we're transmitting, no exception should be created. Fixes: 52a589d51f10 ("geneve: update skb dst pmtu on tx path") Fixes: a93bf0ff4490 ("vxlan: update skb dst pmtu on tx path") Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/dst.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/net/dst.h b/include/net/dst.h
index 7f735e76ca73..6cf0870414c7 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -527,4 +527,14 @@ static inline void skb_dst_update_pmtu(struct sk_buff *skb, u32 mtu)
dst->ops->update_pmtu(dst, NULL, skb, mtu);
}
+static inline void skb_tunnel_check_pmtu(struct sk_buff *skb,
+ struct dst_entry *encap_dst,
+ int headroom)
+{
+ u32 encap_mtu = dst_mtu(encap_dst);
+
+ if (skb->len > encap_mtu - headroom)
+ skb_dst_update_pmtu(skb, encap_mtu - headroom);
+}
+
#endif /* _NET_DST_H */