From 424b86a6bc9459a830e1e94e0e908f3ac1716b7e Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Sun, 29 Mar 2009 13:46:01 -0700 Subject: [PATCH] netfilter: xtables: fix IPv6 dependency in the cluster match This patch fixes a dependency with IPv6: ERROR: "__ipv6_addr_type" [net/netfilter/xt_cluster.ko] undefined! This patch adds a function that checks if the higher bits of the address is 0xFF to identify a multicast address, instead of adding a dependency due to __ipv6_addr_type(). I came up with this idea after Patrick McHardy pointed possible problems with runtime module dependencies. Reported-by: Steven Noonan Reported-by: Randy Dunlap Reported-by: Cyrill Gorcunov Signed-off-by: Pablo Neira Ayuso Signed-off-by: David S. Miller --- net/netfilter/xt_cluster.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/net/netfilter/xt_cluster.c b/net/netfilter/xt_cluster.c index ad5bd890e4e..6c4847662b8 100644 --- a/net/netfilter/xt_cluster.c +++ b/net/netfilter/xt_cluster.c @@ -57,6 +57,13 @@ xt_cluster_hash(const struct nf_conn *ct, return (((u64)hash * info->total_nodes) >> 32); } +static inline bool +xt_cluster_ipv6_is_multicast(const struct in6_addr *addr) +{ + __be32 st = addr->s6_addr32[0]; + return ((st & htonl(0xFF000000)) == htonl(0xFF000000)); +} + static inline bool xt_cluster_is_multicast_addr(const struct sk_buff *skb, u_int8_t family) { @@ -67,8 +74,8 @@ xt_cluster_is_multicast_addr(const struct sk_buff *skb, u_int8_t family) is_multicast = ipv4_is_multicast(ip_hdr(skb)->daddr); break; case NFPROTO_IPV6: - is_multicast = ipv6_addr_type(&ipv6_hdr(skb)->daddr) & - IPV6_ADDR_MULTICAST; + is_multicast = + xt_cluster_ipv6_is_multicast(&ipv6_hdr(skb)->daddr); break; default: WARN_ON(1); -- 2.41.1