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netlink/diag: report flags for netlink sockets 

cb_running is reported in /proc/self/net/netlink and it is reported by
the ss tool, when it gets information from the proc files.

sock_diag is a new interface which is used instead of proc files, so it
looks reasonable that this interface has to report no less information
about sockets than proc files.

We use these flags to dump and restore netlink sockets.

Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrey Vagin 2017-04-03 18:13:32 -07:00 committed by David S. Miller
parent c800460086
commit 457c79e544
4 changed files with 43 additions and 8 deletions
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10
include/uapi/linux/netlink_diag.h
View File

@ -38,6 +38,7 @@ enum {
NETLINK_DIAG_GROUPS,
NETLINK_DIAG_RX_RING,
NETLINK_DIAG_TX_RING,
NETLINK_DIAG_FLAGS,
__NETLINK_DIAG_MAX,
};
@ -52,5 +53,14 @@ enum {
/* deprecated since 4.6 */
#define NDIAG_SHOW_RING_CFG 0x00000004 /* show ring configuration */
#endif
#define NDIAG_SHOW_FLAGS 0x00000008 /* show flags of a netlink socket */
/* flags */
#define NDIAG_FLAG_CB_RUNNING 0x00000001
#define NDIAG_FLAG_PKTINFO 0x00000002
#define NDIAG_FLAG_BROADCAST_ERROR 0x00000004
#define NDIAG_FLAG_NO_ENOBUFS 0x00000008
#define NDIAG_FLAG_LISTEN_ALL_NSID 0x00000010
#define NDIAG_FLAG_CAP_ACK 0x00000020
#endif

8
net/netlink/af_netlink.c
View File

@ -78,14 +78,6 @@ struct listeners {
/* state bits */
#define NETLINK_S_CONGESTED 0x0
/* flags */
#define NETLINK_F_KERNEL_SOCKET 0x1
#define NETLINK_F_RECV_PKTINFO 0x2
#define NETLINK_F_BROADCAST_SEND_ERROR 0x4
#define NETLINK_F_RECV_NO_ENOBUFS 0x8
#define NETLINK_F_LISTEN_ALL_NSID 0x10
#define NETLINK_F_CAP_ACK 0x20
static inline int netlink_is_kernel(struct sock *sk)
{
return nlk_sk(sk)->flags & NETLINK_F_KERNEL_SOCKET;

8
net/netlink/af_netlink.h
View File

@ -6,6 +6,14 @@
#include <linux/workqueue.h>
#include <net/sock.h>
/* flags */
#define NETLINK_F_KERNEL_SOCKET 0x1
#define NETLINK_F_RECV_PKTINFO 0x2
#define NETLINK_F_BROADCAST_SEND_ERROR 0x4
#define NETLINK_F_RECV_NO_ENOBUFS 0x8
#define NETLINK_F_LISTEN_ALL_NSID 0x10
#define NETLINK_F_CAP_ACK 0x20
#define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
#define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long))

25
net/netlink/diag.c
View File

@ -19,6 +19,27 @@ static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb)
nlk->groups);
}
static int sk_diag_put_flags(struct sock *sk, struct sk_buff *skb)
{
struct netlink_sock *nlk = nlk_sk(sk);
u32 flags = 0;
if (nlk->cb_running)
flags |= NDIAG_FLAG_CB_RUNNING;
if (nlk->flags & NETLINK_F_RECV_PKTINFO)
flags |= NDIAG_FLAG_PKTINFO;
if (nlk->flags & NETLINK_F_BROADCAST_SEND_ERROR)
flags |= NDIAG_FLAG_BROADCAST_ERROR;
if (nlk->flags & NETLINK_F_RECV_NO_ENOBUFS)
flags |= NDIAG_FLAG_NO_ENOBUFS;
if (nlk->flags & NETLINK_F_LISTEN_ALL_NSID)
flags |= NDIAG_FLAG_LISTEN_ALL_NSID;
if (nlk->flags & NETLINK_F_CAP_ACK)
flags |= NDIAG_FLAG_CAP_ACK;
return nla_put_u32(skb, NETLINK_DIAG_FLAGS, flags);
}
static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
struct netlink_diag_req *req,
u32 portid, u32 seq, u32 flags, int sk_ino)
@ -52,6 +73,10 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO))
goto out_nlmsg_trim;
if ((req->ndiag_show & NDIAG_SHOW_FLAGS) &&
sk_diag_put_flags(sk, skb))
goto out_nlmsg_trim;
nlmsg_end(skb, nlh);
return 0;