ring: implement setup of tpacket v3 ring

Implement ring setup routines and structures for TPACKET_V3.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/ring.h b/ring.h
index f618a35..7590223 100644
--- a/ring.h
+++ b/ring.h
@@ -45,6 +45,7 @@ struct ring {
 	union {
 		struct tpacket_req layout;
 		struct tpacket_req3 layout3;
+		uint8_t raw;
 	};
 };
 
@@ -113,6 +114,18 @@ static inline void __set_sockopt_tpacket(int sock, int val)
 		panic("Cannot set tpacketv2!\n");
 }
 
+static inline int __get_sockopt_tpacket(int sock)
+{
+	int val, ret;
+	socklen_t len = sizeof(val);
+
+	ret = getsockopt(sock, SOL_PACKET, PACKET_VERSION, &val, &len);
+	if (ret)
+		panic("Cannot set tpacketv2!\n");
+
+	return val;
+}
+
 static inline void set_sockopt_tpacket_v2(int sock)
 {
 	__set_sockopt_tpacket(sock, TPACKET_V2);
@@ -123,4 +136,9 @@ static inline void set_sockopt_tpacket_v3(int sock)
 	__set_sockopt_tpacket(sock, TPACKET_V3);
 }
 
+static inline int get_sockopt_tpacket(int sock)
+{
+	return __get_sockopt_tpacket(sock);
+}
+
 #endif /* RING_H */