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netlink: add RX/TX-ring support to netlink diag

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Based on AF_PACKET.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2013-04-17 06:47:06 +00:00 committed by David S. Miller
parent cd1df525da
commit 4ae9fbee16
2 changed files with 42 additions and 0 deletions
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10
include/uapi/linux/netlink_diag.h
View file

@ -25,9 +25,18 @@ struct netlink_diag_msg {
__u32 ndiag_cookie[2];
};
struct netlink_diag_ring {
__u32 ndr_block_size;
__u32 ndr_block_nr;
__u32 ndr_frame_size;
__u32 ndr_frame_nr;
};
enum {
NETLINK_DIAG_MEMINFO,
NETLINK_DIAG_GROUPS,
NETLINK_DIAG_RX_RING,
NETLINK_DIAG_TX_RING,
__NETLINK_DIAG_MAX,
};
@ -38,5 +47,6 @@ enum {
#define NDIAG_SHOW_MEMINFO 0x00000001 /* show memory info of a socket */
#define NDIAG_SHOW_GROUPS 0x00000002 /* show groups of a netlink socket */
#define NDIAG_SHOW_RING_CFG 0x00000004 /* show ring configuration */
#endif

32
net/netlink/diag.c
View file

@ -7,6 +7,34 @@
#include "af_netlink.h"
static int sk_diag_put_ring(struct netlink_ring *ring, int nl_type,
struct sk_buff *nlskb)
{
struct netlink_diag_ring ndr;
ndr.ndr_block_size = ring->pg_vec_pages << PAGE_SHIFT;
ndr.ndr_block_nr = ring->pg_vec_len;
ndr.ndr_frame_size = ring->frame_size;
ndr.ndr_frame_nr = ring->frame_max + 1;
return nla_put(nlskb, nl_type, sizeof(ndr), &ndr);
}
static int sk_diag_put_rings_cfg(struct sock *sk, struct sk_buff *nlskb)
{
struct netlink_sock *nlk = nlk_sk(sk);
int ret;
mutex_lock(&nlk->pg_vec_lock);
ret = sk_diag_put_ring(&nlk->rx_ring, NETLINK_DIAG_RX_RING, nlskb);
if (!ret)
ret = sk_diag_put_ring(&nlk->tx_ring, NETLINK_DIAG_TX_RING,
nlskb);
mutex_unlock(&nlk->pg_vec_lock);
return ret;
}
static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb)
{
struct netlink_sock *nlk = nlk_sk(sk);
@ -51,6 +79,10 @@ 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_RING_CFG) &&
sk_diag_put_rings_cfg(sk, skb))
goto out_nlmsg_trim;
return nlmsg_end(skb, nlh);
out_nlmsg_trim: