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[NET]: I386 checksum annotations and cleanups.

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* sanitize prototypes, annotate
* usual ntohs->shift

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 21:21:37 -08:00 committed by David S. Miller
parent 475b8f311b
commit 72685fcd28
1 changed files with 31 additions and 34 deletions
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65
include/asm-i386/checksum.h
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@ -17,7 +17,7 @@
*
* it's best to have buff aligned on a 32-bit boundary
*/
asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
/*
* the same as csum_partial, but copies from src while it
@ -27,8 +27,8 @@ asmlinkage unsigned int csum_partial(const unsigned char * buff, int len, unsign
* better 64-bit) boundary
*/
asmlinkage unsigned int csum_partial_copy_generic(const unsigned char *src, unsigned char *dst,
int len, int sum, int *src_err_ptr, int *dst_err_ptr);
asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst,
int len, __wsum sum, int *src_err_ptr, int *dst_err_ptr);
/*
* Note: when you get a NULL pointer exception here this means someone
@ -38,18 +38,18 @@ asmlinkage unsigned int csum_partial_copy_generic(const unsigned char *src, unsi
* access_ok().
*/
static __inline__
unsigned int csum_partial_copy_nocheck (const unsigned char *src, unsigned char *dst,
int len, int sum)
__wsum csum_partial_copy_nocheck (const void *src, void *dst,
int len, __wsum sum)
{
return csum_partial_copy_generic ( src, dst, len, sum, NULL, NULL);
}
static __inline__
unsigned int csum_partial_copy_from_user(const unsigned char __user *src, unsigned char *dst,
int len, int sum, int *err_ptr)
__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
int len, __wsum sum, int *err_ptr)
{
might_sleep();
return csum_partial_copy_generic((__force unsigned char *)src, dst,
return csum_partial_copy_generic((__force void *)src, dst,
len, sum, err_ptr, NULL);
}
@ -60,8 +60,7 @@ unsigned int csum_partial_copy_from_user(const unsigned char __user *src, unsign
* By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
* Arnt Gulbrandsen.
*/
static inline unsigned short ip_fast_csum(unsigned char * iph,
unsigned int ihl)
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
{
unsigned int sum;
@ -89,29 +88,29 @@ static inline unsigned short ip_fast_csum(unsigned char * iph,
: "=r" (sum), "=r" (iph), "=r" (ihl)
: "1" (iph), "2" (ihl)
: "memory");
return(sum);
return (__force __sum16)sum;
}
/*
* Fold a partial checksum
*/
static inline unsigned int csum_fold(unsigned int sum)
static inline __sum16 csum_fold(__wsum sum)
{
__asm__(
"addl %1, %0 ;\n"
"adcl $0xffff, %0 ;\n"
: "=r" (sum)
: "r" (sum << 16), "0" (sum & 0xffff0000)
: "r" ((__force u32)sum << 16),
"0" ((__force u32)sum & 0xffff0000)
);
return (~sum) >> 16;
return (__force __sum16)(~(__force u32)sum >> 16);
}
static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
unsigned long daddr,
unsigned short len,
unsigned short proto,
unsigned int sum)
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
unsigned short len,
unsigned short proto,
__wsum sum)
{
__asm__(
"addl %1, %0 ;\n"
@ -119,7 +118,7 @@ static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
"adcl %3, %0 ;\n"
"adcl $0, %0 ;\n"
: "=r" (sum)
: "g" (daddr), "g"(saddr), "g"((ntohs(len)<<16)+proto*256), "0"(sum));
: "g" (daddr), "g"(saddr), "g"((len + proto) << 8), "0"(sum));
return sum;
}
@ -127,11 +126,10 @@ static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
* computes the checksum of the TCP/UDP pseudo-header
* returns a 16-bit checksum, already complemented
*/
static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
unsigned long daddr,
static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
unsigned short len,
unsigned short proto,
unsigned int sum)
__wsum sum)
{
return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
}
@ -141,17 +139,16 @@ static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
* in icmp.c
*/
static inline unsigned short ip_compute_csum(unsigned char * buff, int len)
static inline __sum16 ip_compute_csum(const void *buff, int len)
{
return csum_fold (csum_partial(buff, len, 0));
}
#define _HAVE_ARCH_IPV6_CSUM
static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
struct in6_addr *daddr,
__u32 len,
unsigned short proto,
unsigned int sum)
static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
const struct in6_addr *daddr,
__u32 len, unsigned short proto,
__wsum sum)
{
__asm__(
"addl 0(%1), %0 ;\n"
@ -176,19 +173,19 @@ static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
* Copy and checksum to user
*/
#define HAVE_CSUM_COPY_USER
static __inline__ unsigned int csum_and_copy_to_user(const unsigned char *src,
unsigned char __user *dst,
int len, int sum,
static __inline__ __wsum csum_and_copy_to_user(const void *src,
void __user *dst,
int len, __wsum sum,
int *err_ptr)
{
might_sleep();
if (access_ok(VERIFY_WRITE, dst, len))
return csum_partial_copy_generic(src, (__force unsigned char *)dst, len, sum, NULL, err_ptr);
return csum_partial_copy_generic(src, (__force void *)dst, len, sum, NULL, err_ptr);
if (len)
*err_ptr = -EFAULT;
return -1; /* invalid checksum */
return (__force __wsum)-1; /* invalid checksum */
}
#endif