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-rw-r--r--net/netfilter/core.c27
1 files changed, 10 insertions, 17 deletions
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index d80b935b3a92..17f9e1cbc73b 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -222,28 +222,21 @@ copy_skb:
}
EXPORT_SYMBOL(skb_make_writable);
-u_int16_t nf_csum_update(u_int32_t oldval, u_int32_t newval, u_int32_t csum)
-{
- u_int32_t diff[] = { oldval, newval };
-
- return csum_fold(csum_partial((char *)diff, sizeof(diff), ~csum));
-}
-EXPORT_SYMBOL(nf_csum_update);
-
-u_int16_t nf_proto_csum_update(struct sk_buff *skb,
- u_int32_t oldval, u_int32_t newval,
- u_int16_t csum, int pseudohdr)
+void nf_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
+ __be32 from, __be32 to, int pseudohdr)
{
+ __be32 diff[] = { ~from, to };
if (skb->ip_summed != CHECKSUM_PARTIAL) {
- csum = nf_csum_update(oldval, newval, csum);
+ *sum = csum_fold(csum_partial((char *)diff, sizeof(diff),
+ ~csum_unfold(*sum)));
if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
- skb->csum = nf_csum_update(oldval, newval, skb->csum);
+ skb->csum = ~csum_partial((char *)diff, sizeof(diff),
+ ~skb->csum);
} else if (pseudohdr)
- csum = ~nf_csum_update(oldval, newval, ~csum);
-
- return csum;
+ *sum = ~csum_fold(csum_partial((char *)diff, sizeof(diff),
+ csum_unfold(*sum)));
}
-EXPORT_SYMBOL(nf_proto_csum_update);
+EXPORT_SYMBOL(nf_proto_csum_replace4);
/* This does not belong here, but locally generated errors need it if connection
tracking in use: without this, connection may not be in hash table, and hence