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authorEric Leblond <eric@inl.fr>2009-02-09 14:33:20 -0800
committerDavid S. Miller <davem@davemloft.net>2009-02-09 14:33:20 -0800
commit3f9007135c1dc896db9a9e35920aafc65b157230 (patch)
treeff164ddf28a24c7a780393fd91df2dad3e76318b /net
parenta51f42f3c940e5582c40454ece066d033bc7e24f (diff)
downloadlinux-2.6.38-lt-ux500-3f9007135c1dc896db9a9e35920aafc65b157230.tar.gz
netfilter: nf_conntrack_ipv6: don't track ICMPv6 negotiation message
This patch removes connection tracking handling for ICMPv6 messages related to Stateless Address Autoconfiguration, MLD, and MLDv2. They can not be tracked because they are massively using multicast (on pre-defined address). But they are not invalid and should not be detected as such. Signed-off-by: Eric Leblond <eric@inl.fr> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
index 114a92e4258..c323643ffcf 100644
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -53,6 +53,17 @@ static const u_int8_t invmap[] = {
[ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY +1
};
+static const u_int8_t noct_valid_new[] = {
+ [ICMPV6_MGM_QUERY - 130] = 1,
+ [ICMPV6_MGM_REPORT -130] = 1,
+ [ICMPV6_MGM_REDUCTION - 130] = 1,
+ [NDISC_ROUTER_SOLICITATION - 130] = 1,
+ [NDISC_ROUTER_ADVERTISEMENT - 130] = 1,
+ [NDISC_NEIGHBOUR_SOLICITATION - 130] = 1,
+ [NDISC_NEIGHBOUR_ADVERTISEMENT - 130] = 1,
+ [ICMPV6_MLD2_REPORT - 130] = 1
+};
+
static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig)
{
@@ -178,6 +189,7 @@ icmpv6_error(struct net *net, struct sk_buff *skb, unsigned int dataoff,
{
const struct icmp6hdr *icmp6h;
struct icmp6hdr _ih;
+ int type;
icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
if (icmp6h == NULL) {
@@ -194,6 +206,15 @@ icmpv6_error(struct net *net, struct sk_buff *skb, unsigned int dataoff,
return -NF_ACCEPT;
}
+ type = icmp6h->icmp6_type - 130;
+ if (type >= 0 && type < sizeof(noct_valid_new) &&
+ noct_valid_new[type]) {
+ skb->nfct = &nf_conntrack_untracked.ct_general;
+ skb->nfctinfo = IP_CT_NEW;
+ nf_conntrack_get(skb->nfct);
+ return NF_ACCEPT;
+ }
+
/* is not error message ? */
if (icmp6h->icmp6_type >= 128)
return NF_ACCEPT;