[PATCH net-next v10 01/13] rtnetlink: Lookup device in target netns when creating link
Xiao Liang <[email protected]>
| Newsgroups | org.kernel.vger.linux-wpan,dev.linux.lists.bridge,org.kernel.vger.bpf,org.kernel.vger.linux-can,org.kernel.vger.linux-kernel,org.kernel.vger.linux-kselftest,org.kernel.vger.linux-ppp,org.kernel.vger.linux-rdma,org.kernel.vger.linux-wireless,org.kernel.vger.netdev,org.open-mesh.lists.batman |
|---|---|
| Message-ID | <[email protected]> |
When creating link, lookup for existing device in target net namespace instead of current one. For example, two links created by: # ip link add dummy1 type dummy # ip link add netns ns1 dummy1 type dummy should have no conflict since they are in different namespaces. Signed-off-by: Xiao Liang <[email protected]> Reviewed-by: Kuniyuki Iwashima <[email protected]> --- net/core/rtnetlink.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index abe1a461ea67..0f3e2c6021de 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -3867,20 +3867,26 @@ static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, { struct nlattr ** const tb = tbs->tb; struct net *net = sock_net(skb->sk); + struct net *device_net; struct net_device *dev; struct ifinfomsg *ifm; bool link_specified; + /* When creating, lookup for existing device in target net namespace */ + device_net = (nlh->nlmsg_flags & NLM_F_CREATE) && + (nlh->nlmsg_flags & NLM_F_EXCL) ? + tgt_net : net; + ifm = nlmsg_data(nlh); if (ifm->ifi_index > 0) { link_specified = true; - dev = __dev_get_by_index(net, ifm->ifi_index); + dev = __dev_get_by_index(device_net, ifm->ifi_index); } else if (ifm->ifi_index < 0) { NL_SET_ERR_MSG(extack, "ifindex can't be negative"); return -EINVAL; } else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) { link_specified = true; - dev = rtnl_dev_get(net, tb); + dev = rtnl_dev_get(device_net, tb); } else { link_specified = false; dev = NULL; -- 2.48.1