[NET]: UML checksum annotations and cleanups.

* sanitize prototypes, annotate
* kill csum_partial_copy_fromuser
* kill shift-by-16 in checksum calculations
* ntohs->shift in checksum calculations

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 23 insertions, 24 deletions

diff --git a/arch/um/include/sysdep-x86_64/checksum.h b/arch/um/include/sysdep-x86_64/checksum.h
index ea97005af69..a5be9031ea8 100644
--- a/arch/um/include/sysdep-x86_64/checksum.h
+++ b/arch/um/include/sysdep-x86_64/checksum.h
@@ -9,8 +9,7 @@
 #include "linux/in6.h"
 #include "asm/uaccess.h"
 
-extern unsigned csum_partial(const unsigned char *buff, unsigned len,
-                             unsigned sum);
+extern __wsum csum_partial(const void *buff, int len, __wsum sum);
 
 /*
  *      Note: when you get a NULL pointer exception here this means someone
@@ -21,21 +20,21 @@ extern unsigned csum_partial(const unsigned char *buff, unsigned len,
  */
 
 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)
 {
         memcpy(dst, src, len);
         return(csum_partial(dst, len, sum));
 }
 
 static __inline__
-unsigned int csum_partial_copy_from_user(const unsigned char *src,
-                                         unsigned char *dst, int len, int sum,
+__wsum csum_partial_copy_from_user(const void __user *src,
+                                         void *dst, int len, __wsum sum,
                                          int *err_ptr)
 {
-        if(copy_from_user(dst, src, len)){
+        if (copy_from_user(dst, src, len)) {
                 *err_ptr = -EFAULT;
-                return(-1);
+                return (__force __wsum)-1;
         }
         return csum_partial(dst, len, sum);
 }
@@ -48,15 +47,16 @@ unsigned int csum_partial_copy_from_user(const unsigned char *src,
  * the last step before putting a checksum into a packet.
  * Make sure not to mix with 64bit checksums.
  */
-static inline unsigned int csum_fold(unsigned int sum)
+static inline __sum16 csum_fold(__wsum sum)
 {
         __asm__(
                 "  addl %1,%0\n"
                 "  adcl $0xffff,%0"
                 : "=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);
 }
 
 /**
@@ -70,28 +70,27 @@ static inline unsigned int csum_fold(unsigned int sum)
  * Returns the pseudo header checksum the input data. Result is
  * 32bit unfolded.
  */
-static inline unsigned long
-csum_tcpudp_nofold(unsigned saddr, unsigned 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"
             "  adcl %2, %0\n"
             "  adcl %3, %0\n"
             "  adcl $0, %0\n"
                 : "=r" (sum)
-            : "g" (daddr), "g" (saddr), "g" ((ntohs(len)<<16)+proto*256), "0" (sum));
-    return sum;
+            : "g" (daddr), "g" (saddr), "g" ((len + proto) << 8), "0" (sum));
+        return sum;
 }
 
 /*
  * 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,
-                                                   unsigned short len,
-                                                   unsigned short proto,
-                                                   unsigned int sum)
+static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
+                                           unsigned short len,
+                                           unsigned short proto,
+                                           __wsum sum)
 {
         return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
 }
@@ -101,7 +100,7 @@ static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
  * iph: ipv4 header
  * ihl: length of header / 4
  */
-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;
 
@@ -128,7 +127,7 @@ static inline unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl)
         : "=r" (sum), "=r" (iph), "=r" (ihl)
         : "1" (iph), "2" (ihl)
         : "memory");
-        return(sum);
+        return (__force __sum16)sum;
 }
 
 static inline unsigned add32_with_carry(unsigned a, unsigned b)
@@ -140,6 +139,6 @@ static inline unsigned add32_with_carry(unsigned a, unsigned b)
         return a;
 }
 
-extern unsigned short ip_compute_csum(unsigned char * buff, int len);
+extern __sum16 ip_compute_csum(const void *buff, int len);
 
 #endif