netfilter: xt_LOG: add net namespace support for xt_LOG

Add pernet support to xt_LOG by means of the new nf_log_set
function added in (30e0c6a netfilter: nf_log: prepare net
namespace support for loggers).

Since syslog ns has yet not been implemented, we don't want
the containers to DDOS host's syslogd. So only enable ebt_log
only from init_net and wait for syslog ns support

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 49 insertions, 3 deletions

diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c
index fa40096940a1..fe573f6c9e91 100644
--- a/net/netfilter/xt_LOG.c
+++ b/net/netfilter/xt_LOG.c
@@ -474,7 +474,14 @@ ipt_log_packet(u_int8_t pf,
                const struct nf_loginfo *loginfo,
                const char *prefix)
 {
-        struct sbuff *m = sb_open();
+        struct sbuff *m;
+        struct net *net = dev_net(in ? in : out);
+
+        /* FIXME: Disabled from containers until syslog ns is supported */
+        if (!net_eq(net, &init_net))
+                return;
+
+        m = sb_open();
 
         if (!loginfo)
                 loginfo = &default_loginfo;
@@ -798,7 +805,14 @@ ip6t_log_packet(u_int8_t pf,
                 const struct nf_loginfo *loginfo,
                 const char *prefix)
 {
-        struct sbuff *m = sb_open();
+        struct sbuff *m;
+        struct net *net = dev_net(in ? in : out);
+
+        /* FIXME: Disabled from containers until syslog ns is supported */
+        if (!net_eq(net, &init_net))
+                return;
+
+        m = sb_open();
 
         if (!loginfo)
                 loginfo = &default_loginfo;
@@ -893,23 +907,55 @@ static struct nf_logger ip6t_log_logger __read_mostly = {
 };
 #endif
 
+static int __net_init log_net_init(struct net *net)
+{
+        nf_log_set(net, NFPROTO_IPV4, &ipt_log_logger);
+#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
+        nf_log_set(net, NFPROTO_IPV6, &ip6t_log_logger);
+#endif
+        return 0;
+}
+
+static void __net_exit log_net_exit(struct net *net)
+{
+        nf_log_unset(net, &ipt_log_logger);
+#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
+        nf_log_unset(net, &ip6t_log_logger);
+#endif
+}
+
+static struct pernet_operations log_net_ops = {
+        .init = log_net_init,
+        .exit = log_net_exit,
+};
+
 static int __init log_tg_init(void)
 {
         int ret;
 
+        ret = register_pernet_subsys(&log_net_ops);
+        if (ret < 0)
+                goto err_pernet;
+
         ret = xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
         if (ret < 0)
-                return ret;
+                goto err_target;
 
         nf_log_register(NFPROTO_IPV4, &ipt_log_logger);
 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
         nf_log_register(NFPROTO_IPV6, &ip6t_log_logger);
 #endif
         return 0;
+
+err_target:
+        unregister_pernet_subsys(&log_net_ops);
+err_pernet:
+        return ret;
 }
 
 static void __exit log_tg_exit(void)
 {
+        unregister_pernet_subsys(&log_net_ops);
         nf_log_unregister(&ipt_log_logger);
 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
         nf_log_unregister(&ip6t_log_logger);