netdev - [PATCH] rtnetlink: Handle IFLA_MASTER parameter when processing rtnl

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Message-Id: <20170130232346.29761-1-theuns.verwoerd@alliedtelesis.co.nz>
Date:   Tue, 31 Jan 2017 12:23:46 +1300
From:   Theuns Verwoerd <theuns.verwoerd@...iedtelesis.co.nz>
To:     netdev@...r.kernel.org
Cc:     dsa@...ulusnetworks.com,
        Theuns Verwoerd <theuns.verwoerd@...iedtelesis.co.nz>
Subject: [PATCH] rtnetlink: Handle IFLA_MASTER parameter when processing rtnl_newlink

Allow a master interface to be specified as one of the parameters when
creating a new interface via rtnl_newlink.  Previously this would
require invoking interface creation, waiting for it to complete, and
then separately binding that new interface to a master.

In particular, this is used when creating a macvlan child interface for
VRRP in a VRF configuration, allowing the interface creator to specify
directly what master interface should be inherited by the child,
without having to deal with asynchronous complications and potential
race conditions.

Signed-off-by: Theuns Verwoerd <theuns.verwoerd@...iedtelesis.co.nz>
---
 net/core/rtnetlink.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 75e3ea7bda08..a24719c98238 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2571,7 +2571,7 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
 			return -ENODEV;
 		}

-		if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
+		if (tb[IFLA_MAP] || tb[IFLA_PROTINFO])
 			return -EOPNOTSUPP;

 		if (!ops) {
@@ -2653,6 +2653,11 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh)
 			if (err < 0)
 				goto out_unregister;
 		}
+		if (tb[IFLA_MASTER]) {
+			err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]));
+			if (err)
+				goto out_unregister;
+		}
 out:
 		if (link_net)
 			put_net(link_net);
-- 
2.11.0