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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@verizon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Levin, Alexander (Sasha Levin) 2017-08-17 00:35:11 +00:00 committed by David S. Miller
parent f21e507701
commit 0888e372c3
2 changed files with 12 additions and 0 deletions
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1
include/uapi/linux/inet_diag.h
View File

@ -142,6 +142,7 @@ enum {
INET_DIAG_PAD,
INET_DIAG_MARK,
INET_DIAG_BBRINFO,
INET_DIAG_CLASS_ID,
__INET_DIAG_MAX,
};

11
net/ipv4/inet_diag.c
View File

@ -274,6 +274,17 @@ 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
if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
goto errout;
}
out:
nlmsg_end(skb, nlh);
return 0;