netdev - [PATCH V2 net-next 4/6] net: sched: add netns refcount tracker to struct tcf

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Date:   Thu,  9 Dec 2021 23:44:24 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH V2 net-next 4/6] net: sched: add netns refcount tracker to struct tcf_exts

From: Eric Dumazet <edumazet@...gle.com>

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/pkt_cls.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 193f88ebf629bd5a66c2d155346b40695e259a13..cebc1bd713b68e9c9c7b7656f569e749c0dc9297 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -202,7 +202,8 @@ struct tcf_exts {
 	__u32	type; /* for backward compat(TCA_OLD_COMPAT) */
 	int nr_actions;
 	struct tc_action **actions;
-	struct net *net;
+	struct net	*net;
+	netns_tracker	ns_tracker;
 #endif
 	/* Map to export classifier specific extension TLV types to the
 	 * generic extensions API. Unsupported extensions must be set to 0.
@@ -218,6 +219,7 @@ static inline int tcf_exts_init(struct tcf_exts *exts, struct net *net,
 	exts->type = 0;
 	exts->nr_actions = 0;
 	exts->net = net;
+	netns_tracker_alloc(net, &exts->ns_tracker, GFP_KERNEL);
 	exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *),
 				GFP_KERNEL);
 	if (!exts->actions)
@@ -236,6 +238,8 @@ static inline bool tcf_exts_get_net(struct tcf_exts *exts)
 {
 #ifdef CONFIG_NET_CLS_ACT
 	exts->net = maybe_get_net(exts->net);
+	if (exts->net)
+		netns_tracker_alloc(exts->net, &exts->ns_tracker, GFP_KERNEL);
 	return exts->net != NULL;
 #else
 	return true;
@@ -246,7 +250,7 @@ static inline void tcf_exts_put_net(struct tcf_exts *exts)
 {
 #ifdef CONFIG_NET_CLS_ACT
 	if (exts->net)
-		put_net(exts->net);
+		put_net_track(exts->net, &exts->ns_tracker);
 #endif
 }
 
-- 
2.34.1.173.g76aa8bc2d0-goog