netfilter: conntrack: do not dump other netns's conntrack entries via proc

We should skip the conntracks that belong to a different namespace,
otherwise other unrelated netns's conntrack entries will be dumped via
/proc/net/nf_conntrack.

Fixes: 56d52d4892d0 ("netfilter: conntrack: use a single hashtable for all namespaces")
Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 958a145..9f267c3 100644 (file)
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -205,6 +205,7 @@ static int ct_seq_show(struct seq_file *s, void *v)
        struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
        const struct nf_conntrack_l3proto *l3proto;
        const struct nf_conntrack_l4proto *l4proto;
+       struct net *net = seq_file_net(s);
        int ret = 0;
 
        NF_CT_ASSERT(ct);
@@ -215,6 +216,9 @@ static int ct_seq_show(struct seq_file *s, void *v)
        if (NF_CT_DIRECTION(hash))
                goto release;
 
+       if (!net_eq(nf_ct_net(ct), net))
+               goto release;
+
        l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
        NF_CT_ASSERT(l3proto);
        l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));