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authorDmitry Yakunin <zeil@yandex-team.ru>2020-04-30 18:51:14 +0300
committerDavid S. Miller <davem@davemloft.net>2020-04-30 12:54:01 -0700
commit6e3a401fc8af01828bcdc92d713195d318b36e7e (patch)
tree6b3c057c6caecbb64eee8852ff65a4689d612ad1 /net/ipv4/inet_diag.c
parent8a769c65bb7a3cba0db01b0f46850862c9f5d7bf (diff)
inet_diag: add cgroup id attribute
This patch adds cgroup v2 ID to common inet diag message attributes. Cgroup v2 ID is kernfs ID (ino or ino+gen). This attribute allows filter inet diag output by cgroup ID obtained by name_to_handle_at() syscall. When net_cls or net_prio cgroup is activated this ID is equal to 1 (root cgroup ID) for newly created sockets. Some notes about this ID: 1) gets initialized in socket() syscall 2) incoming socket gets ID from listening socket (not during accept() syscall) 3) not changed when process get moved to another cgroup 4) can point to deleted cgroup (refcounting) v2: - use CONFIG_SOCK_CGROUP_DATA instead if CONFIG_CGROUPS v3: - fix attr size by using nla_total_size_64bit() (Eric Dumazet) - more detailed commit message (Konstantin Khlebnikov) Signed-off-by: Dmitry Yakunin <zeil@yandex-team.ru> Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Acked-By: Tejun Heo <tj@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_diag.c')
-rw-r--r--net/ipv4/inet_diag.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 5d50aad3cdbf..9c4c315cbc10 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -162,6 +162,13 @@ int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
goto errout;
}
+#ifdef CONFIG_SOCK_CGROUP_DATA
+ if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID,
+ cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)),
+ INET_DIAG_PAD))
+ goto errout;
+#endif
+
r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
r->idiag_inode = sock_i_ino(sk);