netfilter: ip6t_NPT: fix IPv6 NTP checksum calculation

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@sophos.com>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 7 insertions, 26 deletions

diff --git a/net/ipv6/netfilter/ip6t_NPT.c b/net/ipv6/netfilter/ip6t_NPT.c
index e9486915eff..7302b0b7b64 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;