wpa_supplicant: Allow configuring the MACsec port for MKA

Previously, wpa_supplicant only supported hardcoded port == 1 in the
SCI, but users may want to choose a different port.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>

src/pae/ieee802_1x_kay.c

@@ -3071,7 +3071,7 @@ static void kay_l2_receive(void *ctx, const u8 *src_addr, const u8 *buf,
  */
 struct ieee802_1x_kay *
 ieee802_1x_kay_init(struct ieee802_1x_kay_ctx *ctx, enum macsec_policy policy,
-		    const char *ifname, const u8 *addr)
+		    u16 port, const char *ifname, const u8 *addr)
 {
 	struct ieee802_1x_kay *kay;
 
@@ -3093,7 +3093,7 @@ ieee802_1x_kay_init(struct ieee802_1x_kay_ctx *ctx, enum macsec_policy policy,
 
 	os_strlcpy(kay->if_name, ifname, IFNAMSIZ);
 	os_memcpy(kay->actor_sci.addr, addr, ETH_ALEN);
-	kay->actor_sci.port = host_to_be16(0x0001);
+	kay->actor_sci.port = host_to_be16(port ? port : 0x0001);
 	kay->actor_priority = DEFAULT_PRIO_NOT_KEY_SERVER;
 
 	/* While actor acts as a key server, shall distribute sakey */

src/pae/ieee802_1x_kay.h

@@ -233,7 +233,7 @@ struct ieee802_1x_kay {
 
 struct ieee802_1x_kay *
 ieee802_1x_kay_init(struct ieee802_1x_kay_ctx *ctx, enum macsec_policy policy,
-		    const char *ifname, const u8 *addr);
+		    u16 port, const char *ifname, const u8 *addr);
 void ieee802_1x_kay_deinit(struct ieee802_1x_kay *kay);
 
 struct ieee802_1x_mka_participant *

wpa_supplicant/config.c

@@ -2126,6 +2126,7 @@ static const struct parse_data ssid_fields[] = {
 #ifdef CONFIG_MACSEC
 	{ INT_RANGE(macsec_policy, 0, 1) },
 	{ INT_RANGE(macsec_integ_only, 0, 1) },
+	{ INT_RANGE(macsec_port, 1, 65534) },
 	{ FUNC_KEY(mka_cak) },
 	{ FUNC_KEY(mka_ckn) },
 #endif /* CONFIG_MACSEC */

wpa_supplicant/config_file.c

@@ -809,6 +809,7 @@ static void wpa_config_write_network(FILE *f, struct wpa_ssid *ssid)
 	write_mka_cak(f, ssid);
 	write_mka_ckn(f, ssid);
 	INT(macsec_integ_only);
+	INT(macsec_port);
 #endif /* CONFIG_MACSEC */
 #ifdef CONFIG_HS20
 	INT(update_identifier);

wpa_supplicant/config_ssid.h

@@ -741,6 +741,15 @@ struct wpa_ssid {
 	 */
 	int macsec_integ_only;
 
+	/**
+	 * macsec_port - MACsec port (in SCI)
+	 *
+	 * Port component of the SCI.
+	 *
+	 * Range: 1-65534 (default: 1)
+	 */
+	int macsec_port;
+
 	/**
 	 * mka_ckn - MKA pre-shared CKN
 	 */

wpa_supplicant/wpa_cli.c

@@ -1391,6 +1391,7 @@ static const char *network_fields[] = {
 #ifdef CONFIG_MACSEC
 	"macsec_policy",
 	"macsec_integ_only",
+	"macsec_port",
 #endif /* CONFIG_MACSEC */
 #ifdef CONFIG_HS20
 	"update_identifier",

wpa_supplicant/wpa_supplicant.conf

@@ -899,6 +899,10 @@ fast_reauth=1
 # 0: Encrypt traffic (default)
 # 1: Integrity only
 #
+# macsec_port: IEEE 802.1X/MACsec port
+# Port component of the SCI
+# Range: 1-65534 (default: 1)
+#
 # mka_cak and mka_ckn: IEEE 802.1X/MACsec pre-shared authentication mode
 # This allows to configure MACsec with a pre-shared key using a (CAK,CKN) pair.
 # In this mode, instances of wpa_supplicant can act as peers, one of

wpa_supplicant/wpas_kay.c

@@ -232,8 +232,8 @@ int ieee802_1x_alloc_kay_sm(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
 	kay_ctx->enable_transmit_sa = wpas_enable_transmit_sa;
 	kay_ctx->disable_transmit_sa = wpas_disable_transmit_sa;
 
-	res = ieee802_1x_kay_init(kay_ctx, policy, wpa_s->ifname,
-				  wpa_s->own_addr);
+	res = ieee802_1x_kay_init(kay_ctx, policy, ssid->macsec_port,
+				  wpa_s->ifname, wpa_s->own_addr);
 	if (res == NULL) {
 		os_free(kay_ctx);
 		return -1;