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| author | Michal Kubeček <mkubecek@suse.cz> | 2017-01-31 10:30:06 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2017-02-02 14:31:58 +0100 |
| commit | 2851940ffee313e0ff12540a8e11a8c54dea9c65 (patch) | |
| tree | 0fe2bf02a3125fc7a13800ded0d34812fda92e60 /net/ipv4 | |
| parent | ipvs: free ip_vs_dest structs when refcnt=0 (diff) | |
| download | linux-2851940ffee313e0ff12540a8e11a8c54dea9c65.tar.xz linux-2851940ffee313e0ff12540a8e11a8c54dea9c65.zip | |
netfilter: allow logging from non-init namespaces
Commit 69b34fb996b2 ("netfilter: xt_LOG: add net namespace support for
xt_LOG") disabled logging packets using the LOG target from non-init
namespaces. The motivation was to prevent containers from flooding
kernel log of the host. The plan was to keep it that way until syslog
namespace implementation allows containers to log in a safe way.
However, the work on syslog namespace seems to have hit a dead end
somewhere in 2013 and there are users who want to use xt_LOG in all
network namespaces. This patch allows to do so by setting
/proc/sys/net/netfilter/nf_log_all_netns
to a nonzero value. This sysctl is only accessible from init_net so that
one cannot switch the behaviour from inside a container.
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/netfilter/nf_log_arp.c | 2 | ||||
| -rw-r--r-- | net/ipv4/netfilter/nf_log_ipv4.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/netfilter/nf_log_arp.c b/net/ipv4/netfilter/nf_log_arp.c index b24795e2ee6d..f6f713376e6e 100644 --- a/net/ipv4/netfilter/nf_log_arp.c +++ b/net/ipv4/netfilter/nf_log_arp.c @@ -87,7 +87,7 @@ static void nf_log_arp_packet(struct net *net, u_int8_t pf, struct nf_log_buf *m; /* FIXME: Disabled from containers until syslog ns is supported */ - if (!net_eq(net, &init_net)) + if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns) return; m = nf_log_buf_open(); diff --git a/net/ipv4/netfilter/nf_log_ipv4.c b/net/ipv4/netfilter/nf_log_ipv4.c index 856648966f4c..c83a9963269b 100644 --- a/net/ipv4/netfilter/nf_log_ipv4.c +++ b/net/ipv4/netfilter/nf_log_ipv4.c @@ -319,7 +319,7 @@ static void nf_log_ip_packet(struct net *net, u_int8_t pf, struct nf_log_buf *m; /* FIXME: Disabled from containers until syslog ns is supported */ - if (!net_eq(net, &init_net)) + if (!net_eq(net, &init_net) && !sysctl_nf_log_all_netns) return; m = nf_log_buf_open(); |