[PATCH net-next 7/9] net-timestamp: open gate for bpf_setsockopt

[Jason Xing <kerneljasonxing@gmail.com>]

From: Jason Xing <kernelxing@tencent.com>

Now we allow users to set tsflags through bpf_setsockopt. What I
want to do is passing SOF_TIMESTAMPING_RX_SOFTWARE flag, so that
we can generate rx timestamps the moment the skb traverses through
driver.

Here is an example:

case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
	sock_opt = SOF_TIMESTAMPING_RX_SOFTWARE;
	bpf_setsockopt(skops, SOL_SOCKET, SO_TIMESTAMPING,
		       &sock_opt, sizeof(sock_opt));
	break;

In this way, we can use bpf program that help us generate and report
rx timestamp.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
---
 net/core/filter.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/core/filter.c b/net/core/filter.c
index bd0d08bf76bb..9ce99d320571 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5225,6 +5225,9 @@ static int sol_socket_sockopt(struct sock *sk, int optname,
 		break;
 	case SO_BINDTODEVICE:
 		break;
+	case SO_TIMESTAMPING_NEW:
+	case SO_TIMESTAMPING_OLD:
+		break;
 	default:
 		return -EINVAL;
 	}
-- 
2.37.3