linux-kernel - [PATCH net-next 1/4] net: unix: print cgroup_id and peer_cgroup

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Message-ID: <20250309132821.103046-2-aleksandr.mikhalitsyn@canonical.com>
Date: Sun,  9 Mar 2025 14:28:12 +0100
From: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
To: kuniyu@...zon.com
Cc: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	cgroups@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Leon Romanovsky <leon@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Christian Brauner <brauner@...nel.org>,
	Lennart Poettering <mzxreary@...inter.de>,
	Luca Boccassi <bluca@...ian.org>,
	Tejun Heo <tj@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Koutný <mkoutny@...e.com>
Subject: [PATCH net-next 1/4] net: unix: print cgroup_id and peer_cgroup_id in fdinfo

Cc: linux-kernel@...r.kernel.org
Cc: netdev@...r.kernel.org
Cc: cgroups@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Willem de Bruijn <willemb@...gle.com>
Cc: Leon Romanovsky <leon@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Christian Brauner <brauner@...nel.org>
Cc: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: Lennart Poettering <mzxreary@...inter.de>
Cc: Luca Boccassi <bluca@...ian.org>
Cc: Tejun Heo <tj@...nel.org>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: "Michal Koutný" <mkoutny@...e.com>
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>
---
 net/unix/af_unix.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 7f8f3859cdb3..2b2c0036efc9 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -117,6 +117,7 @@
 #include <linux/file.h>
 #include <linux/btf_ids.h>
 #include <linux/bpf-cgroup.h>
+#include <linux/cgroup.h>
 
 static atomic_long_t unix_nr_socks;
 static struct hlist_head bsd_socket_buckets[UNIX_HASH_SIZE / 2];
@@ -861,6 +862,11 @@ static void unix_show_fdinfo(struct seq_file *m, struct socket *sock)
 	int nr_fds = 0;
 
 	if (sk) {
+#ifdef CONFIG_SOCK_CGROUP_DATA
+		struct sock *peer;
+		u64 sk_cgroup_id = 0;
+#endif
+
 		s_state = READ_ONCE(sk->sk_state);
 		u = unix_sk(sk);
 
@@ -874,6 +880,21 @@ static void unix_show_fdinfo(struct seq_file *m, struct socket *sock)
 			nr_fds = unix_count_nr_fds(sk);
 
 		seq_printf(m, "scm_fds: %u\n", nr_fds);
+
+#ifdef CONFIG_SOCK_CGROUP_DATA
+		sk_cgroup_id = cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data));
+		seq_printf(m, "cgroup_id: %llu\n", sk_cgroup_id);
+
+		peer = unix_peer_get(sk);
+		if (peer) {
+			u64 peer_cgroup_id = 0;
+
+			peer_cgroup_id = cgroup_id(sock_cgroup_ptr(&peer->sk_cgrp_data));
+			sock_put(peer);
+
+			seq_printf(m, "peer_cgroup_id: %llu\n", peer_cgroup_id);
+		}
+#endif
 	}
 }
 #else
-- 
2.43.0