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authorYOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>2013-02-07 11:18:22 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2013-02-07 18:40:27 +0100
commitedb27228db22654a59711135a5f7a20fb49a1016 (patch)
treec541fc4f604ba4b75b9de21ac0ea2af5bcb8e9b9 /net
parentd4c38fa87d2b05be5daafb6a92b6ad15b66da8cb (diff)
netfilter: ip6t_NPT: Ensure to check lower part of prefixes are zero
RFC 6296 points that address bits that are not part of the prefix has to be zeroed. Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/netfilter/ip6t_NPT.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/ip6t_NPT.c b/net/ipv6/netfilter/ip6t_NPT.c
index 87b759c11da5..83acc1405a18 100644
--- a/net/ipv6/netfilter/ip6t_NPT.c
+++ b/net/ipv6/netfilter/ip6t_NPT.c
@@ -9,6 +9,7 @@
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ipv6.h>
+#include <net/ipv6.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter_ipv6/ip6t_NPT.h>
@@ -18,11 +19,20 @@ 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;
if (npt->src_pfx_len > 64 || npt->dst_pfx_len > 64)
return -EINVAL;
+ /* Ensure that LSB of prefix is zero */
+ ipv6_addr_prefix(&pfx, &npt->src_pfx.in6, npt->src_pfx_len);
+ if (!ipv6_addr_equal(&pfx, &npt->src_pfx.in6))
+ return -EINVAL;
+ ipv6_addr_prefix(&pfx, &npt->dst_pfx.in6, npt->dst_pfx_len);
+ 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]);