netfilter: ip6t_NPT: Use csum_partial()

[ Some fixes went into mainstream before this patch, so I needed
  to rebase it upon the current tree, that's why it's different from
  the original one posted on the list --pablo ]

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 3 insertions, 8 deletions

diff --git a/net/ipv6/netfilter/ip6t_NPT.c b/net/ipv6/netfilter/ip6t_NPT.c
index 83acc1405a18..59286a1de850 100644
--- a/net/ipv6/netfilter/ip6t_NPT.c
+++ b/net/ipv6/netfilter/ip6t_NPT.c
@@ -18,9 +18,8 @@
 static int ip6t_npt_checkentry(const struct xt_tgchk_param *par)
 {
         struct ip6t_npt_tginfo *npt = par->targinfo;
-        __wsum src_sum = 0, dst_sum = 0;
         struct in6_addr pfx;
-        unsigned int i;
+        __wsum src_sum, dst_sum;
 
         if (npt->src_pfx_len > 64 || npt->dst_pfx_len > 64)
                 return -EINVAL;
@@ -33,12 +32,8 @@ static int ip6t_npt_checkentry(const struct xt_tgchk_param *par)
         if (!ipv6_addr_equal(&pfx, &npt->dst_pfx.in6))
                 return -EINVAL;
 
-        for (i = 0; i < ARRAY_SIZE(npt->src_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]);
-        }
+        src_sum = csum_partial(&npt->src_pfx.in6, sizeof(npt->src_pfx.in6), 0);
+        dst_sum = csum_partial(&npt->dst_pfx.in6, sizeof(npt->dst_pfx.in6), 0);
 
         npt->adjustment = ~csum_fold(csum_sub(src_sum, dst_sum));
         return 0;