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authorPatrick McHardy <kaber@trash.net>2007-11-29 17:14:30 +0300
committerDavid S. Miller <davem@davemloft.net>2008-01-29 01:55:14 +0300
commita99a00cf1adef2d3dce745c93c9cc8b0a1612c50 (patch)
tree4629669029f845ae141693578a899505cde577e9 /net/core/utils.c
parent3159afe0d2c1994392c269cf9dee2797830d016b (diff)
downloadlinux-a99a00cf1adef2d3dce745c93c9cc8b0a1612c50.tar.xz
[NET]: Move netfilter checksum helpers to net/core/utils.c
This allows to get rid of the CONFIG_NETFILTER dependency of NET_ACT_NAT. This patch redefines the old names to keep the noise low, the next patch converts all users. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/utils.c')
-rw-r--r--net/core/utils.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/net/core/utils.c b/net/core/utils.c
index 0bf17da40d52..34459c4c740c 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -293,3 +293,19 @@ out:
}
EXPORT_SYMBOL(in6_pton);
+
+void inet_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) {
+ *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(inet_proto_csum_replace4);