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RAWNAT: add extension's kernel and userspace modules

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RAWNAT provides stateless 1:1 network address translation.
This commit is contained in:
Jan Engelhardt
2009-03-26 20:37:00 +01:00
parent 03aeed615d
commit 637516f2d4
13 changed files with 804 additions and 2 deletions
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20
extensions/compat_xtables.c
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@@ -447,6 +447,24 @@ int xtnu_ip_route_output_key(void *net, struct rtable **rp, struct flowi *flp)
return ip_route_output_flow(rp, flp, NULL, 0);
}
EXPORT_SYMBOL_GPL(xtnu_ip_route_output_key);
void xtnu_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
__be32 from, __be32 to, bool pseudohdr)
{
__be32 diff[] = {~from, to};
if (skb->ip_summed != CHECKSUM_PARTIAL) {
*sum = csum_fold(csum_partial(diff, sizeof(diff),
~csum_unfold(*sum)));
if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
skb->csum = ~csum_partial(diff, sizeof(diff),
~skb->csum);
} else if (pseudohdr) {
*sum = ~csum_fold(csum_partial(diff, sizeof(diff),
csum_unfold(*sum)));
}
}
EXPORT_SYMBOL_GPL(xtnu_proto_csum_replace4);
#endif
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 19)
@@ -468,7 +486,7 @@ static inline __wsum xtnu_csum_unfold(__sum16 n)
return (__force __wsum)n;
}
static inline void xtnu_csum_replace4(__sum16 *sum, __be32 from, __be32 to)
void xtnu_csum_replace4(__sum16 *sum, __be32 from, __be32 to)
{
__be32 diff[] = {~from, to};
*sum = csum_fold(csum_partial((char *)diff, sizeof(diff),