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netlink: Diag core and basic socket info dumping (v2)

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The netlink_diag can be built as a module, just like it's done in
unix sockets.

The core dumping message carries the basic info about netlink sockets:
family, type and protocol, portis, dst_group, dst_portid, state.

Groups can be received as an optional parameter NETLINK_DIAG_GROUPS.

Netlink sockets cab be filtered by protocols.

The socket inode number and cookie is reserved for future per-socket info
retrieving. The per-protocol filtering is also reserved for future by
requiring the sdiag_protocol to be zero.

The file /proc/net/netlink doesn't provide enough information for
dumping netlink sockets. It doesn't provide dst_group, dst_portid,
groups above 32.

v2: fix NETLINK_DIAG_MAX. Now it's equal to the last constant.

Acked-by: Pavel Emelyanov <xemul@parallels.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Gao feng <gaofeng@cn.fujitsu.com>
Cc: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrey Vagin
2013-03-21 20:33:48 +04:00
committed by David S. Miller
parent 0f29c76864
commit eaaa313926
5 changed files with 244 additions and 0 deletions
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42
include/uapi/linux/netlink_diag.h Normal file
View File

@@ -0,0 +1,42 @@
#ifndef __NETLINK_DIAG_H__
#define __NETLINK_DIAG_H__
#include <linux/types.h>
struct netlink_diag_req {
__u8 sdiag_family;
__u8 sdiag_protocol;
__u16 pad;
__u32 ndiag_ino;
__u32 ndiag_show;
__u32 ndiag_cookie[2];
};
struct netlink_diag_msg {
__u8 ndiag_family;
__u8 ndiag_type;
__u8 ndiag_protocol;
__u8 ndiag_state;
__u32 ndiag_portid;
__u32 ndiag_dst_portid;
__u32 ndiag_dst_group;
__u32 ndiag_ino;
__u32 ndiag_cookie[2];
};
enum {
NETLINK_DIAG_MEMINFO,
NETLINK_DIAG_GROUPS,
__NETLINK_DIAG_MAX,
};
#define NETLINK_DIAG_MAX (__NETLINK_DIAG_MAX - 1)
#define NDIAG_PROTO_ALL ((__u8) ~0)
#define NDIAG_SHOW_MEMINFO 0x00000001 /* show memory info of a socket */
#define NDIAG_SHOW_GROUPS 0x00000002 /* show groups of a netlink socket */
#endif