[NET]: Alpha checksum annotations and cleanups.

* 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>

diff --git a/arch/alpha/lib/checksum.c b/arch/alpha/lib/checksum.c
index 89044e6..ab3761c 100644 (file)
--- a/arch/alpha/lib/checksum.c
+++ b/arch/alpha/lib/checksum.c
@@ -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));
 }

diff --git a/arch/alpha/lib/csum_partial_copy.c b/arch/alpha/lib/csum_partial_copy.c
index a37948f..4ca75c7 100644 (file)
--- a/arch/alpha/lib/csum_partial_copy.c
+++ b/arch/alpha/lib/csum_partial_copy.c
@@ -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;
-}
-
-unsigned int
-csum_partial_copy_from_user(const char __user *src, char *dst, int len,
-                           unsigned int sum, int *errp)
-{
-       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);
+       return (__force __wsum)checksum;
 }
 
-unsigned int
-csum_partial_copy_nocheck(const char __user *src, char *dst, int len,
-                         unsigned int sum)
+__wsum
+csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum 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);
 }

diff --git a/include/asm-alpha/checksum.h b/include/asm-alpha/checksum.h
index a5c9f08..d3854bb 100644 (file)
--- a/include/asm-alpha/checksum.h
+++ b/include/asm-alpha/checksum.h
@@ -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