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authorJulian Anastasov <ja@ssi.bg>2010-10-17 16:17:20 +0300
committerSimon Horman <horms@verge.net.au>2010-10-21 10:50:02 +0200
commit8b27b10f5863a5b63e46304a71aa01463d1efac4 (patch)
tree89f5db8881b0297cda00cad3c2cdedf685e2757f /include
parent5bc9068e9d962ca6b8bec3f0eb6f60ab4dee1d04 (diff)
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ipvs: optimize checksums for apps
Avoid full checksum calculation for apps that can provide info whether csum was broken after payload mangling. For now only ip_vs_ftp mangles payload and it updates the csum, so the full recalculation is avoided for all packets. Add CHECKSUM_UNNECESSARY for snat_handler (TCP and UDP). It is needed to support SNAT from local address for the case when csum is fully recalculated. Signed-off-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'include')
-rw-r--r--include/net/ip_vs.h12
1 files changed, 10 insertions, 2 deletions
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 6e8a6192e57..adcdba9dd18 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -597,11 +597,19 @@ struct ip_vs_app {
__be16 port; /* port number in net order */
atomic_t usecnt; /* usage counter */
- /* output hook: return false if can't linearize. diff set for TCP. */
+ /*
+ * output hook: Process packet in inout direction, diff set for TCP.
+ * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
+ * 2=Mangled but checksum was not updated
+ */
int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
struct sk_buff *, int *diff);
- /* input hook: return false if can't linearize. diff set for TCP. */
+ /*
+ * input hook: Process packet in outin direction, diff set for TCP.
+ * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
+ * 2=Mangled but checksum was not updated
+ */
int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
struct sk_buff *, int *diff);