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netfilter: xt_LOG: add net namespace support for xt_LOG

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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>
This commit is contained in:
Gao feng 2013-03-24 23:50:42 +00:00 • committed by Pablo Neira Ayuso
parent 7d2789246c
commit 69b34fb996
1 changed files with 49 additions and 3 deletions

52
net/netfilter/xt_LOG.c
View file

@ -474,7 +474,14 @@ ipt_log_packet(u_int8_t pf,
const struct nf_loginfo *loginfo, const struct nf_loginfo *loginfo,
const char *prefix) 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) if (!loginfo)
loginfo = &default_loginfo; loginfo = &default_loginfo;
@ -798,7 +805,14 @@ ip6t_log_packet(u_int8_t pf,
const struct nf_loginfo *loginfo, const struct nf_loginfo *loginfo,
const char *prefix) 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) if (!loginfo)
loginfo = &default_loginfo; loginfo = &default_loginfo;
@ -893,23 +907,55 @@ static struct nf_logger ip6t_log_logger __read_mostly = {
}; };
#endif #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) static int __init log_tg_init(void)
{ {
int ret; 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)); ret = xt_register_targets(log_tg_regs, ARRAY_SIZE(log_tg_regs));
if (ret < 0) if (ret < 0)
return ret; goto err_target;
nf_log_register(NFPROTO_IPV4, &ipt_log_logger); nf_log_register(NFPROTO_IPV4, &ipt_log_logger);
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
nf_log_register(NFPROTO_IPV6, &ip6t_log_logger); nf_log_register(NFPROTO_IPV6, &ip6t_log_logger);
#endif #endif
return 0; return 0;
err_target:
unregister_pernet_subsys(&log_net_ops);
err_pernet:
return ret;
} }
static void __exit log_tg_exit(void) static void __exit log_tg_exit(void)
{ {
unregister_pernet_subsys(&log_net_ops);
nf_log_unregister(&ipt_log_logger); nf_log_unregister(&ipt_log_logger);
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES) #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
nf_log_unregister(&ip6t_log_logger); nf_log_unregister(&ip6t_log_logger);