Commit 35fc92a9 authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

[NET]: Allow forwarding of ip_summed except CHECKSUM_COMPLETE

Right now Xen has a horrible hack that lets it forward packets with
partial checksums.  One of the reasons that CHECKSUM_PARTIAL and
CHECKSUM_COMPLETE were added is so that we can get rid of this hack
(where it creates two extra bits in the skbuff to essentially mirror
ip_summed without being destroyed by the forwarding code).

I had forgotten that I've already gone through all the deivce drivers
last time around to make sure that they're looking at ip_summed ==
CHECKSUM_PARTIAL rather than ip_summed != 0 on transmit.  In any case,
I've now done that again so it should definitely be safe.

Unfortunately nobody has yet added any code to update CHECKSUM_COMPLETE
values on forward so we I'm setting that to CHECKSUM_NONE.  This should
be safe to remove for bridging but I'd like to check that code path

So here is the patch that lets us get rid of the hack by preserving
ip_summed (mostly) on forwarded packets.

Signed-off-by: default avatarHerbert Xu <>
Signed-off-by: default avatarDavid S. Miller <>
parent 2d771cd8
......@@ -1654,5 +1654,12 @@ static inline int skb_is_gso(const struct sk_buff *skb)
return skb_shinfo(skb)->gso_size;
static inline void skb_forward_csum(struct sk_buff *skb)
/* Unfortunately we don't support this one. Any brave souls? */
if (skb->ip_summed == CHECKSUM_COMPLETE)
skb->ip_summed = CHECKSUM_NONE;
#endif /* __KERNEL__ */
#endif /* _LINUX_SKBUFF_H */
......@@ -71,7 +71,7 @@ static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
indev = skb->dev;
skb->dev = to->dev;
skb->ip_summed = CHECKSUM_NONE;
NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
......@@ -67,7 +67,7 @@ int ip_forward(struct sk_buff *skb)
if (skb->pkt_type != PACKET_HOST)
goto drop;
skb->ip_summed = CHECKSUM_NONE;
* According to the RFC, we must first decrease the TTL field. If
......@@ -378,7 +378,7 @@ int ip6_forward(struct sk_buff *skb)
goto drop;
skb->ip_summed = CHECKSUM_NONE;
* We DO NOT make any processing on
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment