netfilter: Decrease code duplication regarding transparent socket option

There is a function in include/net/netfilter/nf_socket.h to decide if a
socket has IP(V6)_TRANSPARENT socket option set or not. However this
does the same as inet_sk_transparent() in include/net/tcp.h

include/net/tcp.h:1733
/* This helper checks if socket has IP_TRANSPARENT set */
static inline bool inet_sk_transparent(const struct sock *sk)
{
	switch (sk->sk_state) {
	case TCP_TIME_WAIT:
		return inet_twsk(sk)->tw_transparent;
	case TCP_NEW_SYN_RECV:
		return inet_rsk(inet_reqsk(sk))->no_srccheck;
	}
	return inet_sk(sk)->transparent;
}

tproxy_sk_is_transparent has also been refactored to use this function
instead of reimplementing it.

Signed-off-by: Máté Eckl <ecklm94@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/netfilter/nft_socket.c b/net/netfilter/nft_socket.c
index d86337068ecb..f28a0b944087 100644
--- a/net/netfilter/nft_socket.c
+++ b/net/netfilter/nft_socket.c
@@ -5,6 +5,7 @@
 #include <net/netfilter/nf_tables_core.h>
 #include <net/netfilter/nf_socket.h>
 #include <net/inet_sock.h>
+#include <net/tcp.h>
 
 struct nft_socket {
 	enum nft_socket_keys		key:8;
@@ -48,7 +49,7 @@ static void nft_socket_eval(const struct nft_expr *expr,
 
 	switch(priv->key) {
 	case NFT_SOCKET_TRANSPARENT:
-		nft_reg_store8(dest, nf_sk_is_transparent(sk));
+		nft_reg_store8(dest, inet_sk_transparent(sk));
 		break;
 	default:
 		WARN_ON(1);