sock: Fix capturing extra packets from other dev

Create PF_PACKET socket with proto=0 which does not setup packet handler
and will not capture packets until bind() will be invoked.

Also replaced pf_tx_socket by pf_socket as these funcs became the same,
as proto arg is set to 0.

Suggested-by: Daniel Borkmann <borkmann@iogearbox.net>
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 1 insertions, 10 deletions

diff --git a/sock.c b/sock.c
index fbf50d8..7cfa4a0 100644
--- a/sock.c
+++ b/sock.c
@@ -26,18 +26,9 @@ int af_socket(int af)
 
 int pf_socket(void)
 {
-	int sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
-	if (unlikely(sock < 0))
-		panic("Creation of PF socket failed: %s\n", strerror(errno));
-
-	return sock;
-}
-
-int pf_tx_socket(void)
-{
 	int sock = socket(PF_PACKET, SOCK_RAW, 0);
 	if (unlikely(sock < 0))
-		panic("Creation of PF TX socket failed: %s\n", strerror(errno));
+		panic("Creation of PF socket failed: %s\n", strerror(errno));
 
 	return sock;
 }