From fb4075da5e660597c521f5ff7564af5d984a9bf2 Mon Sep 17 00:00:00 2001
From: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Date: Fri, 31 Oct 2014 15:42:40 +0200
Subject: [PATCH] hwsim: Receive multicast netlink event for NEW/DEL radio
 commands

Kernel sends HWSIM_CMD_NEW_RADIO and HWSIM_CMD_DEL_RADIO multicast
events when new radio have been created and when existing one has
been deleted. The events are sent to "config" netlink multicast group.

The hwsim catches these events and uses the information to monitor
what simulated radios are created and deleted in the system.
---
 tools/hwsim.c | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

diff --git a/tools/hwsim.c b/tools/hwsim.c
index db90db9b..6b134d3e 100644
--- a/tools/hwsim.c
+++ b/tools/hwsim.c
@@ -34,8 +34,8 @@ enum {
 	HWSIM_CMD_REGISTER,
 	HWSIM_CMD_FRAME,
 	HWSIM_CMD_TX_INFO_FRAME,
-	HWSIM_CMD_CREATE_RADIO,
-	HWSIM_CMD_DESTROY_RADIO,
+	HWSIM_CMD_NEW_RADIO,
+	HWSIM_CMD_DEL_RADIO,
 	__HWSIM_CMD_MAX,
 };
 #define HWSIM_CMD_MAX (_HWSIM_CMD_MAX - 1)
@@ -128,12 +128,40 @@ done:
 	l_main_quit();
 }
 
+static void hwsim_config(struct l_genl_msg *msg, void *user_data)
+{
+	struct l_genl_attr attr;
+	uint16_t type, len;
+	const void *data;
+	uint8_t cmd;
+
+	cmd = l_genl_msg_get_command(msg);
+
+	l_debug("Config changed cmd %u", cmd);
+
+	if (!l_genl_attr_init(&attr, msg))
+		return;
+
+	while (l_genl_attr_next(&attr, &type, &len, &data)) {
+		l_debug("\tattr type %d len %d", type, len);
+	}
+}
+
 static void hwsim_ready(void *user_data)
 {
 	struct l_genl_msg *msg;
+	int ret;
+
+	ret = l_genl_family_register(hwsim, "config", hwsim_config,
+				     NULL, NULL);
+	if (ret < 0) {
+		fprintf(stderr, "Failed to create hwsim config listener\n");
+		l_main_quit();
+		return;
+	}
 
 	if (create_action) {
-		msg = l_genl_msg_new_sized(HWSIM_CMD_CREATE_RADIO,
+		msg = l_genl_msg_new_sized(HWSIM_CMD_NEW_RADIO,
 					keep_radios ? 0 : 4);
 
 		if (!keep_radios)
@@ -147,7 +175,7 @@ static void hwsim_ready(void *user_data)
 	} else if (destroy_action) {
 		uint32_t id = atoi(destroy_action);
 
-		msg = l_genl_msg_new_sized(HWSIM_CMD_DESTROY_RADIO, 8);
+		msg = l_genl_msg_new_sized(HWSIM_CMD_DEL_RADIO, 8);
 		l_genl_msg_append_attr(msg, HWSIM_ATTR_RADIO_ID, 4, &id);
 		l_genl_family_send(hwsim, msg, destroy_callback, NULL, NULL);
 		l_genl_msg_unref(msg);