netdev - [PATCHv5 net-next 3/4] rtnetlink: Honour NLM_F_ECHO flag in rtnl_newlink

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Date:   Fri, 30 Sep 2022 17:45:05 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Ido Schimmel <idosch@...dia.com>,
        Petr Machata <petrm@...dia.com>,
        Florent Fourcot <florent.fourcot@...irst.fr>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Guillaume Nault <gnault@...hat.com>,
        David Ahern <dsahern@...nel.org>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCHv5 net-next 3/4] rtnetlink: Honour NLM_F_ECHO flag in rtnl_newlink_create

This patch use the new helper rtnl_configure_link_notify() for
rtnl_newlink_create(), so that the kernel could reply unicast
when userspace set NLM_F_ECHO flag to request the new created
interface info.

Suggested-by: Guillaume Nault <gnault@...hat.com>
Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 net/core/rtnetlink.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 1558921bd4da..da9a6fd156d8 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3318,10 +3318,12 @@ static int rtnl_group_changelink(const struct sk_buff *skb,
 static int rtnl_newlink_create(struct sk_buff *skb, struct ifinfomsg *ifm,
 			       const struct rtnl_link_ops *ops,
 			       struct nlattr **tb, struct nlattr **data,
-			       struct netlink_ext_ack *extack)
+			       struct netlink_ext_ack *extack,
+			       struct nlmsghdr *nlh)
 {
 	unsigned char name_assign_type = NET_NAME_USER;
 	struct net *net = sock_net(skb->sk);
+	u32 pid = NETLINK_CB(skb).portid;
 	struct net *dest_net, *link_net;
 	struct net_device *dev;
 	char ifname[IFNAMSIZ];
@@ -3375,7 +3377,7 @@ static int rtnl_newlink_create(struct sk_buff *skb, struct ifinfomsg *ifm,
 		goto out;
 	}
 
-	err = rtnl_configure_link(dev, ifm);
+	err = rtnl_configure_link_notify(dev, ifm, nlh, pid);
 	if (err < 0)
 		goto out_unregister;
 	if (link_net) {
@@ -3584,7 +3586,7 @@ static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
 		return -EOPNOTSUPP;
 	}
 
-	return rtnl_newlink_create(skb, ifm, ops, tb, data, extack);
+	return rtnl_newlink_create(skb, ifm, ops, tb, data, extack, nlh);
 }
 
 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
-- 
2.37.2