netdev - [PATCH net-next 13/13] rtnetlink: provide RCU protection to rtnl_fill_prop

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Message-ID: <20240221105915.829140-14-edumazet@google.com>
Date: Wed, 21 Feb 2024 10:59:15 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 13/13] rtnetlink: provide RCU protection to rtnl_fill_prop_list()

We want to be able to run rtnl_fill_ifinfo() under RCU protection
instead of RTNL in the future.

dev->name_node items are already rcu protected.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/core/rtnetlink.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index b91ec216c593aaebf97ea69aa0d2d265ab61c098..59b64febb244b51969651bb37740a799376ad35f 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1700,7 +1700,7 @@ static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
 	struct netdev_name_node *name_node;
 	int count = 0;
 
-	list_for_each_entry(name_node, &dev->name_node->list, list) {
+	list_for_each_entry_rcu(name_node, &dev->name_node->list, list) {
 		if (nla_put_string(skb, IFLA_ALT_IFNAME, name_node->name))
 			return -EMSGSIZE;
 		count++;
@@ -1708,6 +1708,7 @@ static int rtnl_fill_alt_ifnames(struct sk_buff *skb,
 	return count;
 }
 
+/* RCU protected. */
 static int rtnl_fill_prop_list(struct sk_buff *skb,
 			       const struct net_device *dev)
 {
@@ -1928,11 +1929,9 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
 		goto nla_put_failure_rcu;
 	if (rtnl_fill_link_ifmap(skb, dev))
 		goto nla_put_failure_rcu;
-
-	rcu_read_unlock();
-
 	if (rtnl_fill_prop_list(skb, dev))
-		goto nla_put_failure;
+		goto nla_put_failure_rcu;
+	rcu_read_unlock();
 
 	if (dev->dev.parent &&
 	    nla_put_string(skb, IFLA_PARENT_DEV_NAME,
-- 
2.44.0.rc0.258.g7320e95886-goog