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ipvs: optimize checksums for apps

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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>
This commit is contained in:
Julian Anastasov
2010-10-17 16:17:20 +03:00
committed by Simon Horman
parent 5bc9068e9d
commit 8b27b10f58
4 changed files with 66 additions and 15 deletions
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12
include/net/ip_vs.h
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@@ -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);