add basic support for jail network namespaces

Prepare netifd for handling procd service jails having their own
network namespace.
Intefaces having the jail attribute will only be brought inside the
jail's network namespace by procd calling the newly introduced ubus
method 'netns_updown'.
Currently proto 'static' is supported and configuration changes are
not yet being handled (ie. you'll have to restart the jailed service
for changes to take effect).

Example /etc/config/network snippet:

config device 'veth0'
    option type 'veth'
    option name 'vhost0'
    option peer_name 'virt0'

config interface 'virt'
    option type 'bridge'
    list ifname 'vhost0'
    option proto 'static'
    option ipaddr '10.0.0.1'
    option netmask '255.255.255.0'

config interface 'virt0'
    option ifname 'virt0'
    option proto 'static'
    option ipaddr '10.0.0.2'
    option netmask '255.255.255.0'
    option gateway '10.0.0.1'
    option dns '10.0.0.1'
    option jail 'transmission'

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/system.h b/system.h
index 61c4046..fe4497e 100644
--- a/system.h
+++ b/system.h
@@ -243,4 +243,8 @@ void system_fd_set_cloexec(int fd);
 
 int system_update_ipv6_mtu(struct device *dev, int mtu);
 
+int system_link_netns_move(const char *ifname, const pid_t target_ns);
+int system_netns_open(const pid_t target_ns);
+int system_netns_set(int netns_fd);
+
 #endif