net: tls: export protocol version, cipher, tx_conf/rx_conf to socket diag

When an application configures kernel TLS on top of a TCP socket, it's
now possible for inet_diag_handler() to collect information regarding the
protocol version, the cipher type and TX / RX configuration, in case
INET_DIAG_INFO is requested.

Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/net/tls.h b/include/net/tls.h
index 4997742475cd..ec3c3ed2c6c3 100644
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -431,6 +431,23 @@ static inline bool is_tx_ready(struct tls_sw_context_tx *ctx)
 	return READ_ONCE(rec->tx_ready);
 }
 
+static inline u16 tls_user_config(struct tls_context *ctx, bool tx)
+{
+	u16 config = tx ? ctx->tx_conf : ctx->rx_conf;
+
+	switch (config) {
+	case TLS_BASE:
+		return TLS_CONF_BASE;
+	case TLS_SW:
+		return TLS_CONF_SW;
+	case TLS_HW:
+		return TLS_CONF_HW;
+	case TLS_HW_RECORD:
+		return TLS_CONF_HW_RECORD;
+	}
+	return 0;
+}
+
 struct sk_buff *
 tls_validate_xmit_skb(struct sock *sk, struct net_device *dev,
 		      struct sk_buff *skb);