1 files changed, 86 insertions, 17 deletions

diff --git a/include/net/checksum.h b/include/net/checksum.h
index e3ea7cc2c72..87cb1903640 100644
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -27,8 +27,8 @@
 
 #ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
 static inline
-unsigned int csum_and_copy_from_user (const unsigned char __user *src, unsigned char *dst,
-				      int len, int sum, int *err_ptr)
+__wsum csum_and_copy_from_user (const void __user *src, void *dst,
+				      int len, __wsum sum, int *err_ptr)
 {
 	if (access_ok(VERIFY_READ, src, len))
 		return csum_partial_copy_from_user(src, dst, len, sum, err_ptr);
@@ -41,8 +41,8 @@ unsigned int csum_and_copy_from_user (const unsigned char __user *src, unsigned
 #endif
 
 #ifndef HAVE_CSUM_COPY_USER
-static __inline__ unsigned int csum_and_copy_to_user
-(const unsigned char *src, unsigned char __user *dst, int len, unsigned int sum, int *err_ptr)
+static __inline__ __wsum csum_and_copy_to_user
+(const void *src, void __user *dst, int len, __wsum sum, int *err_ptr)
 {
 	sum = csum_partial(src, len, sum);
 
@@ -53,35 +53,104 @@ static __inline__ unsigned int csum_and_copy_to_user
 	if (len)
 		*err_ptr = -EFAULT;
 
-	return -1; /* invalid checksum */
+	return (__force __wsum)-1; /* invalid checksum */
 }
 #endif
 
-static inline unsigned int csum_add(unsigned int csum, unsigned int addend)
+#ifndef HAVE_ARCH_CSUM_ADD
+static inline __wsum csum_add(__wsum csum, __wsum addend)
 {
-	csum += addend;
-	return csum + (csum < addend);
+	u32 res = (__force u32)csum;
+	res += (__force u32)addend;
+	return (__force __wsum)(res + (res < (__force u32)addend));
 }
+#endif
 
-static inline unsigned int csum_sub(unsigned int csum, unsigned int addend)
+static inline __wsum csum_sub(__wsum csum, __wsum addend)
 {
 	return csum_add(csum, ~addend);
 }
 
-static inline unsigned int
-csum_block_add(unsigned int csum, unsigned int csum2, int offset)
+static inline __sum16 csum16_add(__sum16 csum, __be16 addend)
+{
+	u16 res = (__force u16)csum;
+
+	res += (__force u16)addend;
+	return (__force __sum16)(res + (res < (__force u16)addend));
+}
+
+static inline __sum16 csum16_sub(__sum16 csum, __be16 addend)
+{
+	return csum16_add(csum, ~addend);
+}
+
+static inline __wsum
+csum_block_add(__wsum csum, __wsum csum2, int offset)
 {
+	u32 sum = (__force u32)csum2;
 	if (offset&1)
-		csum2 = ((csum2&0xFF00FF)<<8)+((csum2>>8)&0xFF00FF);
-	return csum_add(csum, csum2);
+		sum = ((sum&0xFF00FF)<<8)+((sum>>8)&0xFF00FF);
+	return csum_add(csum, (__force __wsum)sum);
 }
 
-static inline unsigned int
-csum_block_sub(unsigned int csum, unsigned int csum2, int offset)
+static inline __wsum
+csum_block_add_ext(__wsum csum, __wsum csum2, int offset, int len)
 {
+	return csum_block_add(csum, csum2, offset);
+}
+
+static inline __wsum
+csum_block_sub(__wsum csum, __wsum csum2, int offset)
+{
+	u32 sum = (__force u32)csum2;
 	if (offset&1)
-		csum2 = ((csum2&0xFF00FF)<<8)+((csum2>>8)&0xFF00FF);
-	return csum_sub(csum, csum2);
+		sum = ((sum&0xFF00FF)<<8)+((sum>>8)&0xFF00FF);
+	return csum_sub(csum, (__force __wsum)sum);
+}
+
+static inline __wsum csum_unfold(__sum16 n)
+{
+	return (__force __wsum)n;
+}
+
+static inline __wsum csum_partial_ext(const void *buff, int len, __wsum sum)
+{
+	return csum_partial(buff, len, sum);
+}
+
+#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(diff, sizeof(diff), ~csum_unfold(*sum)));
+}
+
+/* Implements RFC 1624 (Incremental Internet Checksum)
+ * 3. Discussion states :
+ *     HC' = ~(~HC + ~m + m')
+ *  m : old value of a 16bit field
+ *  m' : new value of a 16bit field
+ */
+static inline void csum_replace2(__sum16 *sum, __be16 old, __be16 new)
+{
+	*sum = ~csum16_add(csum16_sub(~(*sum), old), new);
+}
+
+struct sk_buff;
+void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
+			      __be32 from, __be32 to, int pseudohdr);
+void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,
+			       const __be32 *from, const __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