mka: Allow configuration of MACsec hardware offload

Add new configuration parameter macsec_offload to allow user to set up
MACsec hardware offload feature.

Signed-off-by: Emeel Hakim <ehakim@nvidia.com>

hostapd/config_file.c

@@ -4636,6 +4636,16 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 		bss->macsec_replay_protect = macsec_replay_protect;
 	} else if (os_strcmp(buf, "macsec_replay_window") == 0) {
 		bss->macsec_replay_window = atoi(pos);
+	} else if (os_strcmp(buf, "macsec_offload") == 0) {
+		int macsec_offload = atoi(pos);
+
+		if (macsec_offload < 0 || macsec_offload > 2) {
+			wpa_printf(MSG_ERROR,
+				   "Line %d: invalid macsec_offload (%d): '%s'.",
+				   line, macsec_offload, pos);
+			return 1;
+		}
+		bss->macsec_offload = macsec_offload;
 	} else if (os_strcmp(buf, "macsec_port") == 0) {
 		int macsec_port = atoi(pos);
 

hostapd/hostapd.conf

@@ -1117,6 +1117,14 @@ eapol_key_index_workaround=0
 # 0: No replay window, strict check (default)
 # 1..2^32-1: number of packets that could be misordered
 #
+# macsec_offload: IEEE 802.1X/MACsec hardware offload
+# This setting applies only when MACsec is in use, i.e.,
+#  - macsec_policy is enabled
+#  - the key server has decided to enable MACsec
+# 0 = MACSEC_OFFLOAD_OFF (default)
+# 1 = MACSEC_OFFLOAD_PHY
+# 2 = MACSEC_OFFLOAD_MAC
+#
 # macsec_port: IEEE 802.1X/MACsec port
 # Port component of the SCI
 # Range: 1-65534 (default: 1)

src/ap/ap_config.h

@@ -844,6 +844,19 @@ struct hostapd_bss_config {
 	 */
 	u32 macsec_replay_window;
 
+	/**
+	 * macsec_offload - Enable MACsec offload
+	 *
+	 * This setting applies only when MACsec is in use, i.e.,
+	 *  - macsec_policy is enabled
+	 *  - the key server has decided to enable MACsec
+	 *
+	 * 0 = MACSEC_OFFLOAD_OFF (default)
+	 * 1 = MACSEC_OFFLOAD_PHY
+	 * 2 = MACSEC_OFFLOAD_MAC
+	 */
+	int macsec_offload;
+
 	/**
 	 * macsec_port - MACsec port (in SCI)
 	 *

src/ap/wpa_auth_kay.c

@@ -327,6 +327,7 @@ int ieee802_1x_alloc_kay_sm_hapd(struct hostapd_data *hapd,
 	res = ieee802_1x_kay_init(kay_ctx, policy,
 				  hapd->conf->macsec_replay_protect,
 				  hapd->conf->macsec_replay_window,
+				  hapd->conf->macsec_offload,
 				  hapd->conf->macsec_port,
 				  hapd->conf->mka_priority,
 				  hapd->conf->macsec_csindex,

src/drivers/driver.h

@@ -4520,6 +4520,16 @@ struct wpa_driver_ops {
 	 */
 	int (*set_replay_protect)(void *priv, bool enabled, u32 window);
 
+	/**
+	 * set_offload - Set MACsec hardware offload
+	 * @priv: Private driver interface data
+	 * @offload: 0 = MACSEC_OFFLOAD_OFF
+	 *           1 = MACSEC_OFFLOAD_PHY
+	 *           2 = MACSEC_OFFLOAD_MAC
+	 * Returns: 0 on success, -1 on failure (or if not supported)
+	 */
+	int (*set_offload)(void *priv, u8 offload);
+
 	/**
 	 * set_current_cipher_suite - Set current cipher suite
 	 * @priv: Private driver interface data

src/pae/ieee802_1x_cp.c

@@ -84,6 +84,7 @@ struct ieee802_1x_cp_sm {
 
 	/* not defined IEEE Std 802.1X-2010 */
 	struct ieee802_1x_kay *kay;
+	u8 offload;
 };
 
 static void ieee802_1x_cp_retire_when_timeout(void *eloop_ctx,
@@ -188,6 +189,7 @@ SM_STATE(CP, AUTHENTICATED)
 	sm->protect_frames = false;
 	sm->replay_protect = false;
 	sm->validate_frames = Checked;
+	sm->offload = sm->kay->macsec_offload;
 
 	sm->port_valid = false;
 	sm->controlled_port_enabled = true;
@@ -197,6 +199,7 @@ SM_STATE(CP, AUTHENTICATED)
 	secy_cp_control_encrypt(sm->kay, sm->kay->macsec_encrypt);
 	secy_cp_control_validate_frames(sm->kay, sm->validate_frames);
 	secy_cp_control_replay(sm->kay, sm->replay_protect, sm->replay_window);
+	secy_cp_control_offload(sm->kay, sm->offload);
 }
 
 
@@ -208,6 +211,7 @@ SM_STATE(CP, SECURED)
 
 	sm->protect_frames = sm->kay->macsec_protect;
 	sm->replay_protect = sm->kay->macsec_replay_protect;
+	sm->offload = sm->kay->macsec_offload;
 	sm->validate_frames = sm->kay->macsec_validate;
 
 	sm->current_cipher_suite = sm->cipher_suite;
@@ -223,6 +227,7 @@ SM_STATE(CP, SECURED)
 	secy_cp_control_encrypt(sm->kay, sm->kay->macsec_encrypt);
 	secy_cp_control_validate_frames(sm->kay, sm->validate_frames);
 	secy_cp_control_replay(sm->kay, sm->replay_protect, sm->replay_window);
+	secy_cp_control_offload(sm->kay, sm->offload);
 }
 
 
@@ -462,6 +467,7 @@ struct ieee802_1x_cp_sm * ieee802_1x_cp_sm_init(struct ieee802_1x_kay *kay)
 	sm->validate_frames = kay->macsec_validate;
 	sm->replay_protect = kay->macsec_replay_protect;
 	sm->replay_window = kay->macsec_replay_window;
+	sm->offload = kay->macsec_offload;
 
 	sm->controlled_port_enabled = false;
 
@@ -491,6 +497,7 @@ struct ieee802_1x_cp_sm * ieee802_1x_cp_sm_init(struct ieee802_1x_kay *kay)
 	secy_cp_control_confidentiality_offset(sm->kay,
 					       sm->confidentiality_offset);
 	secy_cp_control_current_cipher_suite(sm->kay, sm->current_cipher_suite);
+	secy_cp_control_offload(sm->kay, sm->offload);
 
 	SM_STEP_RUN(CP);
 

src/pae/ieee802_1x_kay.c

@@ -3464,8 +3464,8 @@ 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,
 		    bool macsec_replay_protect, u32 macsec_replay_window,
-		    u16 port, u8 priority, u32 macsec_csindex,
-		    const char *ifname, const u8 *addr)
+		    u8 macsec_offload, u16 port, u8 priority,
+		    u32 macsec_csindex, const char *ifname, const u8 *addr)
 {
 	struct ieee802_1x_kay *kay;
 
@@ -3524,6 +3524,7 @@ ieee802_1x_kay_init(struct ieee802_1x_kay_ctx *ctx, enum macsec_policy policy,
 		kay->macsec_validate = Disabled;
 		kay->macsec_replay_protect = false;
 		kay->macsec_replay_window = 0;
+		kay->macsec_offload = 0;
 		kay->macsec_confidentiality = CONFIDENTIALITY_NONE;
 		kay->mka_hello_time = MKA_HELLO_TIME;
 	} else {
@@ -3540,6 +3541,7 @@ ieee802_1x_kay_init(struct ieee802_1x_kay_ctx *ctx, enum macsec_policy policy,
 		kay->macsec_validate = Strict;
 		kay->macsec_replay_protect = macsec_replay_protect;
 		kay->macsec_replay_window = macsec_replay_window;
+		kay->macsec_offload = macsec_offload;
 		kay->mka_hello_time = MKA_HELLO_TIME;
 	}
 
@@ -3740,6 +3742,7 @@ ieee802_1x_kay_create_mka(struct ieee802_1x_kay *kay,
 	secy_cp_control_protect_frames(kay, kay->macsec_protect);
 	secy_cp_control_replay(kay, kay->macsec_replay_protect,
 			       kay->macsec_replay_window);
+	secy_cp_control_offload(kay, kay->macsec_offload);
 	if (secy_create_transmit_sc(kay, participant->txsc))
 		goto fail;
 

src/pae/ieee802_1x_kay.h

@@ -166,6 +166,7 @@ struct ieee802_1x_kay_ctx {
 	int (*delete_transmit_sa)(void *ctx, struct transmit_sa *sa);
 	int (*enable_transmit_sa)(void *ctx, struct transmit_sa *sa);
 	int (*disable_transmit_sa)(void *ctx, struct transmit_sa *sa);
+	int (*set_offload)(void *ctx, u8 offload);
 };
 
 struct ieee802_1x_kay {
@@ -206,6 +207,7 @@ struct ieee802_1x_kay {
 	bool is_key_server;
 	bool is_obliged_key_server;
 	char if_name[IFNAMSIZ];
+	u8 macsec_offload;
 
 	unsigned int macsec_csindex;  /* MACsec cipher suite table index */
 	int mka_algindex;  /* MKA alg table index */
@@ -240,8 +242,8 @@ u64 mka_sci_u64(struct ieee802_1x_mka_sci *sci);
 struct ieee802_1x_kay *
 ieee802_1x_kay_init(struct ieee802_1x_kay_ctx *ctx, enum macsec_policy policy,
 		    bool macsec_replay_protect, u32 macsec_replay_window,
-		    u16 port, u8 priority, u32 macsec_csindex,
-		    const char *ifname, const u8 *addr);
+		    u8 macsec_offload, u16 port, u8 priority,
+		    u32 macsec_csindex, const char *ifname, const u8 *addr);
 void ieee802_1x_kay_deinit(struct ieee802_1x_kay *kay);
 
 struct ieee802_1x_mka_participant *

src/pae/ieee802_1x_secy_ops.c

@@ -85,6 +85,26 @@ int secy_cp_control_replay(struct ieee802_1x_kay *kay, bool enabled, u32 win)
 }
 
 
+int secy_cp_control_offload(struct ieee802_1x_kay *kay, u8 offload)
+{
+	struct ieee802_1x_kay_ctx *ops;
+
+	if (!kay) {
+		wpa_printf(MSG_ERROR, "KaY: %s params invalid", __func__);
+		return -1;
+	}
+
+	ops = kay->ctx;
+	if (!ops || !ops->set_offload) {
+		wpa_printf(MSG_ERROR,
+			   "KaY: secy set_offload operation not supported");
+		return -1;
+	}
+
+	return ops->set_offload(ops->ctx, offload);
+}
+
+
 int secy_cp_control_current_cipher_suite(struct ieee802_1x_kay *kay, u64 cs)
 {
 	struct ieee802_1x_kay_ctx *ops;

src/pae/ieee802_1x_secy_ops.h

@@ -23,6 +23,7 @@ int secy_cp_control_validate_frames(struct ieee802_1x_kay *kay,
 int secy_cp_control_protect_frames(struct ieee802_1x_kay *kay, bool flag);
 int secy_cp_control_encrypt(struct ieee802_1x_kay *kay, bool enabled);
 int secy_cp_control_replay(struct ieee802_1x_kay *kay, bool flag, u32 win);
+int secy_cp_control_offload(struct ieee802_1x_kay *kay, u8 offload);
 int secy_cp_control_current_cipher_suite(struct ieee802_1x_kay *kay, u64 cs);
 int secy_cp_control_confidentiality_offset(struct ieee802_1x_kay *kay,
 					   enum confidentiality_offset co);

wpa_supplicant/config.c

@@ -2677,6 +2677,7 @@ static const struct parse_data ssid_fields[] = {
 	{ INT_RANGE(macsec_integ_only, 0, 1) },
 	{ INT_RANGE(macsec_replay_protect, 0, 1) },
 	{ INT(macsec_replay_window) },
+	{ INT_RANGE(macsec_offload, 0, 2) },
 	{ INT_RANGE(macsec_port, 1, 65534) },
 	{ INT_RANGE(mka_priority, 0, 255) },
 	{ INT_RANGE(macsec_csindex, 0, 1) },

wpa_supplicant/config_file.c

@@ -814,6 +814,7 @@ static void wpa_config_write_network(FILE *f, struct wpa_ssid *ssid)
 	INT(macsec_integ_only);
 	INT(macsec_replay_protect);
 	INT(macsec_replay_window);
+	INT(macsec_offload);
 	INT(macsec_port);
 	INT_DEF(mka_priority, DEFAULT_PRIO_NOT_KEY_SERVER);
 	INT(macsec_csindex);

wpa_supplicant/config_ssid.h

@@ -926,6 +926,18 @@ struct wpa_ssid {
 	 */
 	u32 macsec_replay_window;
 
+	/**
+	 * macsec_offload - Enable MACsec hardware offload
+	 *
+	 * This setting applies only when MACsec is in use, i.e.,
+	 *  - the key server has decided to enable MACsec
+	 *
+	 * 0 = MACSEC_OFFLOAD_OFF (default)
+	 * 1 = MACSEC_OFFLOAD_PHY
+	 * 2 = MACSEC_OFFLOAD_MAC
+	 */
+	int macsec_offload;
+
 	/**
 	 * macsec_port - MACsec port (in SCI)
 	 *

wpa_supplicant/driver_i.h

@@ -803,6 +803,14 @@ static inline int wpa_drv_set_replay_protect(struct wpa_supplicant *wpa_s,
 						 window);
 }
 
+static inline int wpa_drv_set_offload(struct wpa_supplicant *wpa_s, u8 offload)
+{
+	if (!wpa_s->driver->set_offload)
+		return -1;
+	return wpa_s->driver->set_offload(wpa_s->drv_priv, offload);
+
+}
+
 static inline int wpa_drv_set_current_cipher_suite(struct wpa_supplicant *wpa_s,
 						   u64 cs)
 {

wpa_supplicant/wpa_cli.c

@@ -1487,6 +1487,7 @@ static const char *network_fields[] = {
 	"macsec_integ_only",
 	"macsec_replay_protect",
 	"macsec_replay_window",
+	"macsec_offload",
 	"macsec_port",
 	"mka_priority",
 #endif /* CONFIG_MACSEC */

wpa_supplicant/wpa_supplicant.conf

@@ -1142,6 +1142,15 @@ fast_reauth=1
 # 0: No replay window, strict check (default)
 # 1..2^32-1: number of packets that could be misordered
 #
+# macsec_offload - Enable MACsec hardware offload
+#
+# This setting applies only when MACsec is in use, i.e.,
+#  - the key server has decided to enable MACsec
+#
+# 0 = MACSEC_OFFLOAD_OFF (default)
+# 1 = MACSEC_OFFLOAD_PHY
+# 2 = MACSEC_OFFLOAD_MAC
+#
 # macsec_port: IEEE 802.1X/MACsec port
 # Port component of the SCI
 # Range: 1-65534 (default: 1)

wpa_supplicant/wpas_kay.c

@@ -98,6 +98,12 @@ static int wpas_set_receive_lowest_pn(void *wpa_s, struct receive_sa *sa)
 }
 
 
+static int wpas_set_offload(void *wpa_s, u8 offload)
+{
+	return wpa_drv_set_offload(wpa_s, offload);
+}
+
+
 static unsigned int conf_offset_val(enum confidentiality_offset co)
 {
 	switch (co) {
@@ -219,6 +225,7 @@ int ieee802_1x_alloc_kay_sm(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
 	kay_ctx->enable_protect_frames = wpas_enable_protect_frames;
 	kay_ctx->enable_encrypt = wpas_enable_encrypt;
 	kay_ctx->set_replay_protect = wpas_set_replay_protect;
+	kay_ctx->set_offload = wpas_set_offload;
 	kay_ctx->set_current_cipher_suite = wpas_set_current_cipher_suite;
 	kay_ctx->enable_controlled_port = wpas_enable_controlled_port;
 	kay_ctx->get_receive_lowest_pn = wpas_get_receive_lowest_pn;
@@ -239,7 +246,8 @@ int ieee802_1x_alloc_kay_sm(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
 	kay_ctx->disable_transmit_sa = wpas_disable_transmit_sa;
 
 	res = ieee802_1x_kay_init(kay_ctx, policy, ssid->macsec_replay_protect,
-				  ssid->macsec_replay_window, ssid->macsec_port,
+				  ssid->macsec_replay_window,
+				  ssid->macsec_offload, ssid->macsec_port,
 				  ssid->mka_priority, ssid->macsec_csindex,
 				  wpa_s->ifname, wpa_s->own_addr);
 	/* ieee802_1x_kay_init() frees kay_ctx on failure */