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Subject[PATCH net-next 2/3 V1] rtnetlink: enable IFLA_IF_NETNSID for RTM_SETLINK
- Backwards Compatibility:
If userspace wants to determine whether RTM_SETLINK supports the
IFLA_IF_NETNSID property they should first send an RTM_GETLINK request
with IFLA_IF_NETNSID on lo. If either EACCESS is returned or the reply
does not include IFLA_IF_NETNSID userspace should assume that
IFLA_IF_NETNSID is not supported on this kernel.
If the reply does contain an IFLA_IF_NETNSID property userspace
can send an RTM_SETLINK with a IFLA_IF_NETNSID property. If they receive
EOPNOTSUPP then the kernel does not support the IFLA_IF_NETNSID property
with RTM_SETLINK. Userpace should then fallback to other means.

To retain backwards compatibility the kernel will first check whether a
IFLA_NET_NS_PID or IFLA_NET_NS_FD property has been passed. If either
one is found it will be used to identify the target network namespace.
This implies that users who do not care whether their running kernel
supports IFLA_IF_NETNSID with RTM_SETLINK can pass both
IFLA_NET_NS_{FD,PID} and IFLA_IF_NETNSID referring to the same network

- Security:
Callers must have CAP_NET_ADMIN in the owning user namespace of the
target network namespace.

Signed-off-by: Christian Brauner <>
net/core/rtnetlink.c | 3 ---
1 file changed, 3 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 54134187485b..a4d4409685e3 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2546,9 +2546,6 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err < 0)
goto errout;

- if (tb[IFLA_IF_NETNSID])
- return -EOPNOTSUPP;
if (tb[IFLA_IFNAME])
nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
 \ /
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