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authorAl Viro <viro@zeniv.linux.org.uk>2006-11-14 21:23:59 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-02 21:23:25 -0800
commit56649d5d3c4cb0fe6dd34808ca9f9208d84130ab (patch)
tree0cb1253ffbc068033d5e7bef9b34383816c3050c /include
parentb8e4e01dd5576a14602a49829f9f9d997bb60b6b (diff)
[NET]: Generic checksum annotations and cleanups.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/checksum.h42
-rw-r--r--include/net/ip6_checksum.h76
2 files changed, 63 insertions, 55 deletions
diff --git a/include/net/checksum.h b/include/net/checksum.h
index e3ea7cc2c72..2b3c8dc6c11 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 +53,43 @@ 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)
+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));
}
-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 __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_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;
}
#endif
diff --git a/include/net/ip6_checksum.h b/include/net/ip6_checksum.h
index 3dfc885bdf2..68e2b32cf1d 100644
--- a/include/net/ip6_checksum.h
+++ b/include/net/ip6_checksum.h
@@ -34,60 +34,60 @@
#ifndef _HAVE_ARCH_IPV6_CSUM
-static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
- struct in6_addr *daddr,
- __u16 len,
- unsigned short proto,
- unsigned int csum)
+static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ __u32 len, unsigned short proto,
+ __wsum csum)
{
int carry;
__u32 ulen;
__u32 uproto;
+ __u32 sum = (__force u32)csum;
- csum += saddr->s6_addr32[0];
- carry = (csum < saddr->s6_addr32[0]);
- csum += carry;
+ sum += (__force u32)saddr->s6_addr32[0];
+ carry = (sum < (__force u32)saddr->s6_addr32[0]);
+ sum += carry;
- csum += saddr->s6_addr32[1];
- carry = (csum < saddr->s6_addr32[1]);
- csum += carry;
+ sum += (__force u32)saddr->s6_addr32[1];
+ carry = (sum < (__force u32)saddr->s6_addr32[1]);
+ sum += carry;
- csum += saddr->s6_addr32[2];
- carry = (csum < saddr->s6_addr32[2]);
- csum += carry;
+ sum += (__force u32)saddr->s6_addr32[2];
+ carry = (sum < (__force u32)saddr->s6_addr32[2]);
+ sum += carry;
- csum += saddr->s6_addr32[3];
- carry = (csum < saddr->s6_addr32[3]);
- csum += carry;
+ sum += (__force u32)saddr->s6_addr32[3];
+ carry = (sum < (__force u32)saddr->s6_addr32[3]);
+ sum += carry;
- csum += daddr->s6_addr32[0];
- carry = (csum < daddr->s6_addr32[0]);
- csum += carry;
+ sum += (__force u32)daddr->s6_addr32[0];
+ carry = (sum < (__force u32)daddr->s6_addr32[0]);
+ sum += carry;
- csum += daddr->s6_addr32[1];
- carry = (csum < daddr->s6_addr32[1]);
- csum += carry;
+ sum += (__force u32)daddr->s6_addr32[1];
+ carry = (sum < (__force u32)daddr->s6_addr32[1]);
+ sum += carry;
- csum += daddr->s6_addr32[2];
- carry = (csum < daddr->s6_addr32[2]);
- csum += carry;
+ sum += (__force u32)daddr->s6_addr32[2];
+ carry = (sum < (__force u32)daddr->s6_addr32[2]);
+ sum += carry;
- csum += daddr->s6_addr32[3];
- carry = (csum < daddr->s6_addr32[3]);
- csum += carry;
+ sum += (__force u32)daddr->s6_addr32[3];
+ carry = (sum < (__force u32)daddr->s6_addr32[3]);
+ sum += carry;
- ulen = htonl((__u32) len);
- csum += ulen;
- carry = (csum < ulen);
- csum += carry;
+ ulen = (__force u32)htonl((__u32) len);
+ sum += ulen;
+ carry = (sum < ulen);
+ sum += carry;
- uproto = htonl(proto);
- csum += uproto;
- carry = (csum < uproto);
- csum += carry;
+ uproto = (__force u32)htonl(proto);
+ sum += uproto;
+ carry = (sum < uproto);
+ sum += carry;
- return csum_fold(csum);
+ return csum_fold((__force __wsum)csum);
}
#endif