wpa_supplicant: Add support to probe mesh link to given peer

Inject an Ethernet frame to a given peer bypassing next_hop lookup in
mpath table. Optional payload is expected to be hexdump without 0x.

usage:
wpa_cli -i <dev> mesh_link_probe <peer MAC> [payload=<hexdump of payload>]

example:
wpa_cli -i wlan0 mesh_link_probe aa:bb:cc:dd:ee:ff payload=aabb
wpa_cli -i wlan0 mesh_link_probe aa:bb:cc:dd:ee:ff

Signed-off-by: Pradeep Kumar chitrapu <pradeepc@codeaurora.org>

wpa_supplicant/ctrl_iface.c

@@ -8,10 +8,10 @@
 
 #include "utils/includes.h"
 #ifdef CONFIG_TESTING_OPTIONS
-#include <net/ethernet.h>
 #include <netinet/ip.h>
 #endif /* CONFIG_TESTING_OPTIONS */
 
+#include <net/ethernet.h>
 #include "utils/common.h"
 #include "utils/eloop.h"
 #include "utils/uuid.h"
@@ -3129,6 +3129,49 @@ static int wpa_supplicant_ctrl_iface_mesh_peer_add(
 	return wpas_mesh_peer_add(wpa_s, addr, duration);
 }
 
+
+static int wpa_supplicant_ctrl_iface_mesh_link_probe(
+	struct wpa_supplicant *wpa_s, char *cmd)
+{
+	struct ether_header *eth;
+	u8 addr[ETH_ALEN];
+	u8 *buf;
+	char *pos;
+	size_t payload_len = 0, len;
+	int ret = -1;
+
+	if (hwaddr_aton(cmd, addr))
+		return -1;
+
+	pos = os_strstr(cmd, " payload=");
+	if (pos) {
+		pos = pos + 9;
+		payload_len = os_strlen(pos);
+		if (payload_len & 1)
+			return -1;
+
+		payload_len /= 2;
+	}
+
+	len = ETH_HLEN + payload_len;
+	buf = os_malloc(len);
+	if (!buf)
+		return -1;
+
+	eth = (struct ether_header *) buf;
+	os_memcpy(eth->ether_dhost, addr, ETH_ALEN);
+	os_memcpy(eth->ether_shost, wpa_s->own_addr, ETH_ALEN);
+	eth->ether_type = htons(ETH_P_802_3);
+
+	if (payload_len && hexstr2bin(pos, buf + ETH_HLEN, payload_len) < 0)
+		goto fail;
+
+	ret = wpa_drv_mesh_link_probe(wpa_s, addr, buf, len);
+fail:
+	os_free(buf);
+	return -ret;
+}
+
 #endif /* CONFIG_MESH */
 
 
@@ -10171,6 +10214,9 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
 	} else if (os_strncmp(buf, "MESH_PEER_ADD ", 14) == 0) {
 		if (wpa_supplicant_ctrl_iface_mesh_peer_add(wpa_s, buf + 14))
 			reply_len = -1;
+	} else if (os_strncmp(buf, "MESH_LINK_PROBE ", 16) == 0) {
+		if (wpa_supplicant_ctrl_iface_mesh_link_probe(wpa_s, buf + 16))
+			reply_len = -1;
 #endif /* CONFIG_MESH */
 #ifdef CONFIG_P2P
 	} else if (os_strncmp(buf, "P2P_FIND ", 9) == 0) {

wpa_supplicant/driver_i.h

@@ -87,6 +87,16 @@ static inline int wpa_drv_leave_mesh(struct wpa_supplicant *wpa_s)
 	return -1;
 }
 
+static inline int wpa_drv_mesh_link_probe(struct wpa_supplicant *wpa_s,
+					  const u8 *addr,
+					  const u8 *eth, size_t len)
+{
+	if (wpa_s->driver->probe_mesh_link)
+		return wpa_s->driver->probe_mesh_link(wpa_s->drv_priv, addr,
+						      eth, len);
+	return -1;
+}
+
 static inline int wpa_drv_scan(struct wpa_supplicant *wpa_s,
 			       struct wpa_driver_scan_params *params)
 {

wpa_supplicant/wpa_cli.c

@@ -2064,6 +2064,13 @@ static int wpa_cli_cmd_mesh_peer_add(struct wpa_ctrl *ctrl, int argc,
 	return wpa_cli_cmd(ctrl, "MESH_PEER_ADD", 1, argc, argv);
 }
 
+
+static int wpa_cli_cmd_mesh_link_probe(struct wpa_ctrl *ctrl, int argc,
+				       char *argv[])
+{
+	return wpa_cli_cmd(ctrl, "MESH_LINK_PROBE", 1, argc, argv);
+}
+
 #endif /* CONFIG_MESH */
 
 
@@ -3384,6 +3391,9 @@ static const struct wpa_cli_cmd wpa_cli_commands[] = {
 	{ "mesh_peer_add", wpa_cli_cmd_mesh_peer_add, NULL,
 	  cli_cmd_flag_none,
 	  "<addr> [duration=<seconds>] = Add a mesh peer" },
+	{ "mesh_link_probe", wpa_cli_cmd_mesh_link_probe, NULL,
+	  cli_cmd_flag_none,
+	  "<addr> [payload=<hex dump of payload>] = Probe a mesh link for a given peer by injecting a frame." },
 #endif /* CONFIG_MESH */
 #ifdef CONFIG_P2P
 	{ "p2p_find", wpa_cli_cmd_p2p_find, wpa_cli_complete_p2p_find,