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netfilter: nf_nat_snmp: fix checksum calculation (v4) 

Fix checksum calculation in nf_nat_snmp_basic.

Based on patches by Clark Wang <wtweeker@163.com> and
Stephen Hemminger <shemminger@vyatta.com>.

https://bugzilla.kernel.org/show_bug.cgi?id=17622

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2010-09-21 21:17:33 +00:00 committed by David S. Miller
parent 15cdeadaa5
commit d6120b8afa
1 changed files with 4 additions and 2 deletions
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6
net/ipv4/netfilter/nf_nat_snmp_basic.c
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@ -893,13 +893,15 @@ static void fast_csum(__sum16 *csum,
unsigned char s[4];
if (offset & 1) {
s[0] = s[2] = 0;
s[0] = ~0;
s[1] = ~*optr;
s[2] = 0;
s[3] = *nptr;
} else {
s[1] = s[3] = 0;
s[0] = ~*optr;
s[1] = ~0;
s[2] = *nptr;
s[3] = 0;
}
*csum = csum_fold(csum_partial(s, 4, ~csum_unfold(*csum)));