Based on AF_PACKET.
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
---
include/uapi/linux/netlink_diag.h | 10 ++++++++++
net/netlink/diag.c | 32 ++++++++++++++++++++++++++++++++
2 files changed, 42 insertions(+)
diff --git a/include/uapi/linux/netlink_diag.h b/include/uapi/linux/netlink_diag.h
index 88009a3..4e31db4 100644
--- a/include/uapi/linux/netlink_diag.h
+++ b/include/uapi/linux/netlink_diag.h
@@ -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
diff --git a/net/netlink/diag.c b/net/netlink/diag.c
index 5ffb1d1..4e4aa47 100644
--- a/net/netlink/diag.c
+++ b/net/netlink/diag.c
@@ -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:
--
1.8.1.4
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