netlink: add RX/TX-ring support to netlink diag
Based on AF_PACKET.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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 @@
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: