netfilter: xt_addrtype: replace rt6_lookup with nf_afinfo->route

This avoids pulling in the ipv6 module when using (ipv4-only) iptables
-m addrtype.

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index c3f988a..32bff6d 100644 (file)
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -652,7 +652,6 @@ comment "Xtables matches"
 config NETFILTER_XT_MATCH_ADDRTYPE
        tristate '"addrtype" address type match support'
        depends on NETFILTER_ADVANCED
-       depends on (IPV6 || IPV6=n)
        ---help---
          This option allows you to match what routing thinks of an address,
          eg. UNICAST, LOCAL, BROADCAST, ...

diff --git a/net/netfilter/xt_addrtype.c b/net/netfilter/xt_addrtype.c
index 2220b85..b77d383 100644 (file)
--- a/net/netfilter/xt_addrtype.c
+++ b/net/netfilter/xt_addrtype.c
@@ -32,11 +32,32 @@ MODULE_ALIAS("ipt_addrtype");
 MODULE_ALIAS("ip6t_addrtype");
 
 #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
-static u32 xt_addrtype_rt6_to_type(const struct rt6_info *rt)
+static u32 match_lookup_rt6(struct net *net, const struct net_device *dev,
+                           const struct in6_addr *addr)
 {
+       const struct nf_afinfo *afinfo;
+       struct flowi6 flow;
+       struct rt6_info *rt;
        u32 ret;
+       int route_err;
 
-       if (!rt)
+       memset(&flow, 0, sizeof(flow));
+       ipv6_addr_copy(&flow.daddr, addr);
+       if (dev)
+               flow.flowi6_oif = dev->ifindex;
+
+       rcu_read_lock();
+
+       afinfo = nf_get_afinfo(NFPROTO_IPV6);
+       if (afinfo != NULL)
+               route_err = afinfo->route(net, (struct dst_entry **)&rt,
+                                       flowi6_to_flowi(&flow), !!dev);
+       else
+               route_err = 1;
+
+       rcu_read_unlock();
+
+       if (route_err)
                return XT_ADDRTYPE_UNREACHABLE;
 
        if (rt->rt6i_flags & RTF_REJECT)
@@ -48,6 +69,9 @@ static u32 xt_addrtype_rt6_to_type(const struct rt6_info *rt)
                ret |= XT_ADDRTYPE_LOCAL;
        if (rt->rt6i_flags & RTF_ANYCAST)
                ret |= XT_ADDRTYPE_ANYCAST;
+
+
+       dst_release(&rt->dst);
        return ret;
 }
 
@@ -65,18 +89,8 @@ static bool match_type6(struct net *net, const struct net_device *dev,
                return false;
 
        if ((XT_ADDRTYPE_LOCAL | XT_ADDRTYPE_ANYCAST |
-            XT_ADDRTYPE_UNREACHABLE) & mask) {
-               struct rt6_info *rt;
-               u32 type;
-               int ifindex = dev ? dev->ifindex : 0;
-
-               rt = rt6_lookup(net, addr, NULL, ifindex, !!dev);
-
-               type = xt_addrtype_rt6_to_type(rt);
-
-               dst_release(&rt->dst);
-               return !!(mask & type);
-       }
+            XT_ADDRTYPE_UNREACHABLE) & mask)
+               return !!(mask & match_lookup_rt6(net, dev, addr));
        return true;
 }