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lib/checksum.c: fix carry in csum_tcpudp_nofold

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The carry from the 64->32bits folding was dropped, e.g with:
saddr=0xFFFFFFFF daddr=0xFF0000FF len=0xFFFF proto=0 sum=1,
csum_tcpudp_nofold returned 0 instead of 1.

Signed-off-by: Karl Beldan <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Mike Frysinger <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
karl beldan 2015-01-28 10:58:11 +01:00 • committed by David S. Miller
commit 150ae0e946
1 changed files with 10 additions and 2 deletions
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12
lib/checksum.c
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@ -47,6 +47,15 @@ static inline unsigned short from32to16(unsigned int x)
return x;
}
static inline u32 from64to32(u64 x)
{
/* add up 32-bit and 32-bit for 32+c bit */
x = (x & 0xffffffff) + (x >> 32);
/* add up carry.. */
x = (x & 0xffffffff) + (x >> 32);
return (u32)x;
}
static unsigned int do_csum(const unsigned char *buff, int len)
{
int odd;
@ -195,8 +204,7 @@ __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
#else
s += (proto + len) << 8;
#endif
s += (s >> 32);
return (__force __wsum)s;
return (__force __wsum)from64to32(s);
}
EXPORT_SYMBOL(csum_tcpudp_nofold);
#endif