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Subject[PATCH 9/9] netfilter: use ns_printk in iptable context
Date
To containerise iptables log, use ns_printk
to report individual logs to container as
getting syslog_ns from skb->dev->nd_net->user_ns.

Signed-off-by: Rui Xiang <rui.xiang@huawei.com>
---
include/net/netfilter/xt_log.h | 6 +++++-
net/netfilter/xt_LOG.c | 4 ++--
2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/net/netfilter/xt_log.h b/include/net/netfilter/xt_log.h
index 9d9756c..5222cba 100644
--- a/include/net/netfilter/xt_log.h
+++ b/include/net/netfilter/xt_log.h
@@ -39,10 +39,14 @@ static struct sbuff *sb_open(void)
return m;
}

-static void sb_close(struct sbuff *m)
+static void sb_close(struct sbuff *m, struct sk_buff *skb)
{
m->buf[m->count] = 0;
+#ifdef CONFIG_NET_NS
+ ns_printk(skb->dev->nd_net->user_ns->syslog_ns, "%s\n", m->buf);
+#else
printk("%s\n", m->buf);
+#endif

if (likely(m != &emergency))
kfree(m);
diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c
index 5ab2484..f2cd2fa3 100644
--- a/net/netfilter/xt_LOG.c
+++ b/net/netfilter/xt_LOG.c
@@ -493,7 +493,7 @@ ipt_log_packet(struct net *net,

dump_ipv4_packet(m, loginfo, skb, 0);

- sb_close(m);
+ sb_close(m, skb);
}

#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
@@ -824,7 +824,7 @@ ip6t_log_packet(struct net *net,

dump_ipv6_packet(m, loginfo, skb, skb_network_offset(skb), 1);

- sb_close(m);
+ sb_close(m, skb);
}
#endif

--
1.8.2.2



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