netdev - [PATCH net-next] bpf: add support for SO_PRIORITY in bpf

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Date:   Thu,  9 Nov 2017 15:04:53 -0800
From:   Vlad Dumitrescu <vlad@...itrescu.ro>
To:     davem@...emloft.net, ast@...com, daniel@...earbox.net,
        brakmo@...com
Cc:     netdev@...r.kernel.org, kraigatgoog@...il.com
Subject: [PATCH net-next] bpf: add support for SO_PRIORITY in bpf_getsockopt

From: Vlad Dumitrescu <vladum@...gle.com>

Allows BPF_PROG_TYPE_SOCK_OPS programs to read sk_priority.

Signed-off-by: Vlad Dumitrescu <vladum@...gle.com>
---
 net/core/filter.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index 1afa17935954..61c791f9f628 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3292,8 +3292,20 @@ BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
 	if (!sk_fullsock(sk))
 		goto err_clear;
 
+	if (level == SOL_SOCKET) {
+		if (optlen != sizeof(int))
+			goto err_clear;
+
+		switch (optname) {
+		case SO_PRIORITY:
+			*((int *)optval) = sk->sk_priority;
+			break;
+		default:
+			goto err_clear;
+		}
 #ifdef CONFIG_INET
-	if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) {
+	} else if (level == SOL_TCP &&
+		   sk->sk_prot->getsockopt == tcp_getsockopt) {
 		if (optname == TCP_CONGESTION) {
 			struct inet_connection_sock *icsk = inet_csk(sk);
 
@@ -3304,11 +3316,11 @@ BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
 		} else {
 			goto err_clear;
 		}
+#endif
 	} else {
 		goto err_clear;
 	}
 	return 0;
-#endif
 err_clear:
 	memset(optval, 0, optlen);
 	return -EINVAL;
-- 
2.15.0.448.gf294e3d99a-goog