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netfilter: nf_conntrack_ipv6: don't track ICMPv6 negotiation message

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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>
This commit is contained in:
Eric Leblond 2009-02-09 14:33:20 -08:00 committed by David S. Miller
parent a51f42f3c9
commit 3f9007135c
1 changed files with 21 additions and 0 deletions
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21
net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
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@ -53,6 +53,17 @@ static const u_int8_t invmap[] = {
[ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY +1 [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, static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig) 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; const struct icmp6hdr *icmp6h;
struct icmp6hdr _ih; struct icmp6hdr _ih;
int type;
icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih); icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
if (icmp6h == NULL) { if (icmp6h == NULL) {
@ -194,6 +206,15 @@ icmpv6_error(struct net *net, struct sk_buff *skb, unsigned int dataoff,
return -NF_ACCEPT; 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 ? */ /* is not error message ? */
if (icmp6h->icmp6_type >= 128) if (icmp6h->icmp6_type >= 128)
return NF_ACCEPT; return NF_ACCEPT;