[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, 30 insertions, 44 deletions

diff --git a/arch/um/include/sysdep-i386/checksum.h b/arch/um/include/sysdep-i386/checksum.h
index 052bb061a978..0cb4645cbeb8 100644
--- a/arch/um/include/sysdep-i386/checksum.h
+++ b/arch/um/include/sysdep-i386/checksum.h
@@ -20,8 +20,7 @@
  *
  * 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);
 
 /*
  *      Note: when you get a NULL pointer exception here this means someone
@@ -32,8 +31,8 @@ unsigned int csum_partial(const unsigned char * buff, int 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);
@@ -48,36 +47,25 @@ unsigned int csum_partial_copy_nocheck(const unsigned char *src, unsigned char *
  */
 
 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)
 {
-        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);
 }
 
 /*
- * These are the old (and unsafe) way of doing checksums, a warning message 
- * will be printed if they are used and an exception occurs.
- *
- * these functions should go away after some time.
- */
-
-#define csum_partial_copy_fromuser csum_partial_copy_from_user
-
-/*
  *      This is a version of ip_compute_csum() optimized for IP headers,
  *      which always checksum on 4 octet boundaries.
  *
  *      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;
 
@@ -105,29 +93,29 @@ 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,
+static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
                                                    unsigned short len,
                                                    unsigned short proto,
-                                                   unsigned int sum)
+                                                   __wsum sum)
 {
     __asm__(
         "addl %1, %0    ;\n"
@@ -135,7 +123,7 @@ 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;
 }
 
@@ -143,11 +131,10 @@ 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));
 }
@@ -157,17 +144,16 @@ 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"
@@ -192,14 +178,14 @@ 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, int *err_ptr)
+static __inline__ __wsum csum_and_copy_to_user(const void *src,
+                                                     void __user *dst,
+                                                     int len, __wsum sum, int *err_ptr)
 {
-        if (access_ok(VERIFY_WRITE, dst, len)){
-                if(copy_to_user(dst, src, len)){
+        if (access_ok(VERIFY_WRITE, dst, len)) {
+                if (copy_to_user(dst, src, len)) {
                         *err_ptr = -EFAULT;
-                        return(-1);
+                        return (__force __wsum)-1;
                 }
 
                 return csum_partial(src, len, sum);
@@ -208,7 +194,7 @@ static __inline__ unsigned int csum_and_copy_to_user(const unsigned char *src,
         if (len)
                 *err_ptr = -EFAULT;
 
-        return -1; /* invalid checksum */
+        return (__force __wsum)-1; /* invalid checksum */
 }
 
 #endif