[RFC PATCH net-next v2 5/5] rtnl: allow to create device with IFLA_LINK_NETNSID set
From: Nicolas Dichtel <hidden>
Date: 2014-09-23 13:26:41
Also in:
linux-api, lkml
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
This patch adds the ability to create a netdevice in a specified netns and then move it into the final netns. In fact, it allows to have a symetry between get and set rtnl messages. Signed-off-by: Nicolas Dichtel <redacted> --- net/core/rtnetlink.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 99ed83c62685..34b894ae79b4 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c@@ -1220,6 +1220,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = { [IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 }, [IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN }, [IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */ + [IFLA_LINK_NETNSID] = { .type = NLA_U32 }, }; static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
@@ -1992,7 +1993,7 @@ replay: struct nlattr *slave_attr[m_ops ? m_ops->slave_maxtype + 1 : 0]; struct nlattr **data = NULL; struct nlattr **slave_data = NULL; - struct net *dest_net; + struct net *dest_net, *link_net = NULL; if (ops) { if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
@@ -2098,7 +2099,18 @@ replay: if (IS_ERR(dest_net)) return PTR_ERR(dest_net); - dev = rtnl_create_link(dest_net, ifname, name_assign_type, ops, tb); + if (tb[IFLA_LINK_NETNSID]) { + int id = nla_get_u32(tb[IFLA_LINK_NETNSID]); + + link_net = get_net_from_netnsid(dest_net, id); + if (link_net == NULL) { + err = -EINVAL; + goto out; + } + } + + dev = rtnl_create_link(link_net ? : dest_net, ifname, + name_assign_type, ops, tb); if (IS_ERR(dev)) { err = PTR_ERR(dev); goto out;
@@ -2126,9 +2138,16 @@ replay: } } err = rtnl_configure_link(dev, ifm); - if (err < 0) + if (err < 0) { unregister_netdevice(dev); + goto out; + } + + if (link_net) + err = dev_change_net_namespace(dev, net, ifname); out: + if (link_net) + put_net(link_net); put_net(dest_net); return err; }
--
2.1.0