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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
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37
arch/alpha/lib/checksum.c
View File

@ -41,28 +41,25 @@ static inline unsigned short from64to16(unsigned long x)
* computes the checksum of the TCP/UDP pseudo-header
* returns a 16-bit checksum, already complemented.
*/
unsigned short int csum_tcpudp_magic(unsigned long saddr,
unsigned long daddr,
__sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
unsigned short len,
unsigned short proto,
unsigned int sum)
__wsum sum)
{
return ~from64to16(saddr + daddr + sum +
((unsigned long) ntohs(len) << 16) +
((unsigned long) proto << 8));
return (__force __sum16)~from64to16(
(__force u64)saddr + (__force u64)daddr +
(__force u64)sum + ((len + proto) << 8));
}
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)
{
unsigned long result;
result = (saddr + daddr + sum +
((unsigned long) ntohs(len) << 16) +
((unsigned long) proto << 8));
result = (__force u64)saddr + (__force u64)daddr +
(__force u64)sum + ((len + proto) << 8);
/* Fold down to 32-bits so we don't lose in the typedef-less
network stack. */
@ -70,7 +67,7 @@ unsigned int csum_tcpudp_nofold(unsigned long saddr,
result = (result & 0xffffffff) + (result >> 32);
/* 33 to 32 */
result = (result & 0xffffffff) + (result >> 32);
return result;
return (__force __wsum)result;
}
/*
@ -146,9 +143,9 @@ out:
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
*/
unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)
__sum16 ip_fast_csum(const void *iph, unsigned int ihl)
{
return ~do_csum(iph,ihl*4);
return (__force __sum16)~do_csum(iph,ihl*4);
}
/*
@ -163,15 +160,15 @@ unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)
*
* it's best to have buff aligned on a 32-bit boundary
*/
unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
__wsum csum_partial(const void *buff, int len, __wsum sum)
{
unsigned long result = do_csum(buff, len);
/* add in old sum, and carry.. */
result += sum;
result += (__force u32)sum;
/* 32+c bits -> 32 bits */
result = (result & 0xffffffff) + (result >> 32);
return result;
return (__force __wsum)result;
}
EXPORT_SYMBOL(csum_partial);
@ -180,7 +177,7 @@ EXPORT_SYMBOL(csum_partial);
* this routine is used for miscellaneous IP-like checksums, mainly
* in icmp.c
*/
unsigned short ip_compute_csum(unsigned char * buff, int len)
__sum16 ip_compute_csum(const void *buff, int len)
{
return ~from64to16(do_csum(buff,len));
return (__force __sum16)~from64to16(do_csum(buff,len));
}

31
arch/alpha/lib/csum_partial_copy.c
View File

@ -329,11 +329,11 @@ csum_partial_cfu_unaligned(const unsigned long __user * src,
return checksum;
}
static unsigned int
do_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 long checksum = (unsigned) sum;
unsigned long checksum = (__force u32) sum;
unsigned long soff = 7 & (unsigned long) src;
unsigned long doff = 7 & (unsigned long) dst;
@ -367,25 +367,12 @@ do_csum_partial_copy_from_user(const char __user *src, char *dst, int len,
}
checksum = from64to16 (checksum);
}
return checksum;
return (__force __wsum)checksum;
}
unsigned int
csum_partial_copy_from_user(const char __user *src, char *dst, int len,
unsigned int sum, int *errp)
__wsum
csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
{
if (!access_ok(VERIFY_READ, src, len)) {
*errp = -EFAULT;
memset(dst, 0, len);
return sum;
}
return do_csum_partial_copy_from_user(src, dst, len, sum, errp);
}
unsigned int
csum_partial_copy_nocheck(const char __user *src, char *dst, int len,
unsigned int sum)
{
return do_csum_partial_copy_from_user(src, dst, len, sum, NULL);
return csum_partial_copy_from_user((__force const void __user *)src,
dst, len, sum, NULL);
}

34
include/asm-alpha/checksum.h
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