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[NET]: Alpha checksum annotations and cleanups.

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* sanitize prototypes and annotate
* kill useless access_ok() in csum_partial_copy_from_user() (the only
caller checks it already).
* do_csum_partial_copy_from_user() is not needed now
* replace htons(len) with len << 8 - they are the same wrt checksums
on little-endian.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Al Viro
2006-11-14 21:14:53 -08:00
committed by David S. Miller
parent 2bc357987a
commit 9be259aae5
3 changed files with 42 additions and 60 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/asm-alpha/checksum.h
+16 -18
View File
@@ -7,21 +7,20 @@
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
*/
extern unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
/*
* computes the checksum of the TCP/UDP pseudo-header
* returns a 16-bit checksum, already complemented
*/
extern unsigned short int csum_tcpudp_magic(unsigned long saddr,
unsigned long daddr,
extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
unsigned short len,
unsigned short proto,
unsigned int sum);
__wsum sum);
unsigned int csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
unsigned short len, unsigned short proto,
unsigned int sum);
__wsum sum);
/*
* computes the checksum of a memory block at buff, length len,
@@ -35,7 +34,7 @@ unsigned int csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
*
* it's best to have buff aligned on a 32-bit boundary
*/
extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
/*
* the same as csum_partial, but copies from src while it
@@ -44,9 +43,9 @@ extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned i
* here even more important to align src and dst on a 32-bit (or even
* better 64-bit) boundary
*/
unsigned int csum_partial_copy_from_user(const char __user *src, char *dst, int len, unsigned int sum, int *errp);
__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp);
unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum);
__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
/*
@@ -54,24 +53,23 @@ unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, unsi
* in icmp.c
*/
extern unsigned short ip_compute_csum(unsigned char * buff, int len);
extern __sum16 ip_compute_csum(const void *buff, int len);
/*
* Fold a partial checksum without adding pseudo headers
*/
static inline unsigned short csum_fold(unsigned int sum)
static inline __sum16 csum_fold(__wsum csum)
{
u32 sum = (__force u32)csum;
sum = (sum & 0xffff) + (sum >> 16);
sum = (sum & 0xffff) + (sum >> 16);
return ~sum;
return (__force __sum16)~sum;
}
#define _HAVE_ARCH_IPV6_CSUM
extern unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
struct in6_addr *daddr,
__u32 len,
unsigned short proto,
unsigned int sum);
extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
const struct in6_addr *daddr,
__u32 len, unsigned short proto,
__wsum sum);
#endif