summaryrefslogtreecommitdiffstats
path: root/include/net/checksum.h
diff options
context:
space:
mode:
authorPatrick McHardy <kaber@trash.net>2007-11-30 01:14:30 +1100
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:55:14 -0800
commita99a00cf1adef2d3dce745c93c9cc8b0a1612c50 (patch)
tree4629669029f845ae141693578a899505cde577e9 /include/net/checksum.h
parent3159afe0d2c1994392c269cf9dee2797830d016b (diff)
downloadlinux-a99a00cf1adef2d3dce745c93c9cc8b0a1612c50.tar.gz
linux-a99a00cf1adef2d3dce745c93c9cc8b0a1612c50.tar.bz2
linux-a99a00cf1adef2d3dce745c93c9cc8b0a1612c50.zip
[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 'include/net/checksum.h')
-rw-r--r--include/net/checksum.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/include/net/checksum.h b/include/net/checksum.h
index 124246172a88..07602b7fa218 100644
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -93,4 +93,29 @@ static inline __wsum csum_unfold(__sum16 n)
}
#define CSUM_MANGLED_0 ((__force __sum16)0xffff)
+
+static inline void csum_replace4(__sum16 *sum, __be32 from, __be32 to)
+{
+ __be32 diff[] = { ~from, to };
+
+ *sum = csum_fold(csum_partial((char *)diff, sizeof(diff), ~csum_unfold(*sum)));
+}
+
+static inline void csum_replace2(__sum16 *sum, __be16 from, __be16 to)
+{
+ csum_replace4(sum, (__force __be32)from, (__force __be32)to);
+}
+
+struct sk_buff;
+extern void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
+ __be32 from, __be32 to, int pseudohdr);
+
+static inline void inet_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb,
+ __be16 from, __be16 to,
+ int pseudohdr)
+{
+ inet_proto_csum_replace4(sum, skb, (__force __be32)from,
+ (__force __be32)to, pseudohdr);
+}
+
#endif