netdev - [PATCH] net: inet: diag: expose sockets cgroup classid

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Message-ID: <20170726172153.23436-1-alexander.levin@verizon.com>
Date:   Wed, 26 Jul 2017 17:22:05 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     "davem@...emloft.net" <davem@...emloft.net>,
        "kuznet@....inr.ac.ru" <kuznet@....inr.ac.ru>,
        "yoshfuji@...ux-ipv6.org" <yoshfuji@...ux-ipv6.org>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
Subject: [PATCH] net: inet: diag: expose sockets cgroup classid

This is useful for directly looking up a task based on class id rather than
having to scan through all open file descriptors.

Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 include/uapi/linux/inet_diag.h |  1 +
 net/ipv4/inet_diag.c           | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/include/uapi/linux/inet_diag.h b/include/uapi/linux/inet_diag.h
index bbe201047df6..678496897a68 100644
--- a/include/uapi/linux/inet_diag.h
+++ b/include/uapi/linux/inet_diag.h
@@ -142,6 +142,7 @@ enum {
 	INET_DIAG_PAD,
 	INET_DIAG_MARK,
 	INET_DIAG_BBRINFO,
+	INET_DIAG_CLASS_ID,
 	__INET_DIAG_MAX,
 };
 
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 3828b3a805cd..ffc6dad9780a 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -274,6 +274,16 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 			goto errout;
 	}
 
+	if (ext & (1 << (INET_DIAG_CLASS_ID - 1))) {
+		u32 classid = 0;
+
+#ifdef CONFIG_SOCK_CGROUP_DATA
+		classid = sock_cgroup_classid(&sk->sk_cgrp_data);
+#endif
+
+		nla_put(skb, INET_DIAG_CLASS_ID, sizeof(classid), &classid);
+	}
+
 out:
 	nlmsg_end(skb, nlh);
 	return 0;
-- 
2.11.0