From: Ulrich Weber <ulrich.weber@xxxxxxxxxx>
csum16_add() has a broken carry detection, should be:
sum += sum < (__force u16)b;
Instead of fixing csum16_add, remove the custom checksum
functions and use the generic csum_add/csum_sub ones.
Signed-off-by: Ulrich Weber <ulrich.weber@xxxxxxxxxx>
Acked-by: Patrick McHardy <kaber@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/ipv6/netfilter/ip6t_NPT.c | 33 +++++++--------------------------
1 file changed, 7 insertions(+), 26 deletions(-)
diff --git a/net/ipv6/netfilter/ip6t_NPT.c b/net/ipv6/netfilter/ip6t_NPT.c
index e948691..7302b0b 100644
--- a/net/ipv6/netfilter/ip6t_NPT.c
+++ b/net/ipv6/netfilter/ip6t_NPT.c
@@ -14,42 +14,23 @@
#include <linux/netfilter_ipv6/ip6t_NPT.h>
#include <linux/netfilter/x_tables.h>
-static __sum16 csum16_complement(__sum16 a)
-{
- return (__force __sum16)(0xffff - (__force u16)a);
-}
-
-static __sum16 csum16_add(__sum16 a, __sum16 b)
-{
- u16 sum;
-
- sum = (__force u16)a + (__force u16)b;
- sum += (__force u16)a < (__force u16)b;
- return (__force __sum16)sum;
-}
-
-static __sum16 csum16_sub(__sum16 a, __sum16 b)
-{
- return csum16_add(a, csum16_complement(b));
-}
-
static int ip6t_npt_checkentry(const struct xt_tgchk_param *par)
{
struct ip6t_npt_tginfo *npt = par->targinfo;
- __sum16 src_sum = 0, dst_sum = 0;
+ __wsum src_sum = 0, dst_sum = 0;
unsigned int i;
if (npt->src_pfx_len > 64 || npt->dst_pfx_len > 64)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(npt->src_pfx.in6.s6_addr16); i++) {
- src_sum = csum16_add(src_sum,
- (__force __sum16)npt->src_pfx.in6.s6_addr16[i]);
- dst_sum = csum16_add(dst_sum,
- (__force __sum16)npt->dst_pfx.in6.s6_addr16[i]);
+ src_sum = csum_add(src_sum,
+ (__force __wsum)npt->src_pfx.in6.s6_addr16[i]);
+ dst_sum = csum_add(dst_sum,
+ (__force __wsum)npt->dst_pfx.in6.s6_addr16[i]);
}
- npt->adjustment = csum16_sub(src_sum, dst_sum);
+ npt->adjustment = (__force __sum16) csum_sub(src_sum, dst_sum);
return 0;
}
@@ -85,7 +66,7 @@ static bool ip6t_npt_map_pfx(const struct ip6t_npt_tginfo *npt,
return false;
}
- sum = csum16_add((__force __sum16)addr->s6_addr16[idx],
+ sum = (__force __sum16) csum_add((__force __wsum)addr->s6_addr16[idx],
npt->adjustment);
if (sum == CSUM_MANGLED_0)
sum = 0;
--
1.7.10.4
--
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