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compat_xtables: fix compilation with <= 2.6.19

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Once upon a time there was no such checksumming...
This commit is contained in:
Jan Engelhardt
2009-04-30 20:23:52 +02:00
parent 637516f2d4
commit 73e7b5ead1
4 changed files with 34 additions and 10 deletions
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17
extensions/compat_xtables.c
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@@ -20,11 +20,6 @@
#include "compat_skbuff.h"
#include "compat_xtnu.h"
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 19)
typedef __u16 __bitwise __sum16;
typedef __u32 __bitwise __wsum;
#endif
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 22)
static int xtnu_match_run(const struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
@@ -452,17 +447,23 @@ void xtnu_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
__be32 from, __be32 to, bool pseudohdr)
{
__be32 diff[] = {~from, to};
const void *dv = diff; /* kludge for < v2.6.19-555-g72685fc */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
if (skb->ip_summed != CHECKSUM_PARTIAL) {
*sum = csum_fold(csum_partial(diff, sizeof(diff),
*sum = csum_fold(csum_partial(dv, sizeof(diff),
~csum_unfold(*sum)));
if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
skb->csum = ~csum_partial(diff, sizeof(diff),
skb->csum = ~csum_partial(dv, sizeof(diff),
~skb->csum);
} else if (pseudohdr) {
*sum = ~csum_fold(csum_partial(diff, sizeof(diff),
*sum = ~csum_fold(csum_partial(dv, sizeof(diff),
csum_unfold(*sum)));
}
#else
*sum = csum_fold(csum_partial(dv, sizeof(diff),
~csum_unfold(*sum)));
#endif
}
EXPORT_SYMBOL_GPL(xtnu_proto_csum_replace4);
#endif