+static int get_link_signal(struct nl_msg *msg, void *arg)
+{
+ struct nlattr *tb[NL80211_ATTR_MAX + 1];
+ struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+ struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
+ static struct nla_policy policy[NL80211_STA_INFO_MAX + 1] = {
+ [NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 },
+ };
+ int *sig = arg;
+
+ nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
+ genlmsg_attrlen(gnlh, 0), NULL);
+ if (!tb[NL80211_ATTR_STA_INFO] ||
+ nla_parse_nested(sinfo, NL80211_STA_INFO_MAX,
+ tb[NL80211_ATTR_STA_INFO], policy))
+ return NL_SKIP;
+ if (!sinfo[NL80211_STA_INFO_SIGNAL])
+ return NL_SKIP;
+
+ *sig = (s8) nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
+ return NL_SKIP;
+}
+
+
+static int nl80211_get_link_signal(struct wpa_driver_nl80211_data *drv,
+ int *sig)
+{
+ struct nl_msg *msg;
+
+ *sig = -9999;
+
+ msg = nlmsg_alloc();
+ if (!msg)
+ return -ENOMEM;
+
+ genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
+ 0, NL80211_CMD_GET_STATION, 0);
+
+ NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
+ NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, drv->bssid);
+
+ return send_and_recv_msgs(drv, msg, get_link_signal, sig);
+ nla_put_failure:
+ return -ENOBUFS;
+}
+
+
+static void nl80211_cqm_event(struct wpa_driver_nl80211_data *drv,
+ struct nlattr *tb[])
+{
+ static struct nla_policy cqm_policy[NL80211_ATTR_CQM_MAX + 1] = {
+ [NL80211_ATTR_CQM_RSSI_THOLD] = { .type = NLA_U32 },
+ [NL80211_ATTR_CQM_RSSI_HYST] = { .type = NLA_U8 },
+ [NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT] = { .type = NLA_U32 },
+ };
+ struct nlattr *cqm[NL80211_ATTR_CQM_MAX + 1];
+ enum nl80211_cqm_rssi_threshold_event event;
+ union wpa_event_data ed;
+ int sig, res;
+
+ if (tb[NL80211_ATTR_CQM] == NULL ||
+ nla_parse_nested(cqm, NL80211_ATTR_CQM_MAX, tb[NL80211_ATTR_CQM],
+ cqm_policy)) {
+ wpa_printf(MSG_DEBUG, "nl80211: Ignore invalid CQM event");
+ return;
+ }
+
+ if (cqm[NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT] == NULL)
+ return;
+ event = nla_get_u32(cqm[NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT]);
+
+ os_memset(&ed, 0, sizeof(ed));
+
+ if (event == NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH) {
+ wpa_printf(MSG_DEBUG, "nl80211: Connection quality monitor "
+ "event: RSSI high");
+ ed.signal_change.above_threshold = 1;
+ } else if (event == NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW) {
+ wpa_printf(MSG_DEBUG, "nl80211: Connection quality monitor "
+ "event: RSSI low");
+ ed.signal_change.above_threshold = 0;
+ } else
+ return;
+
+ res = nl80211_get_link_signal(drv, &sig);
+ if (res == 0) {
+ ed.signal_change.current_signal = sig;
+ wpa_printf(MSG_DEBUG, "nl80211: Signal: %d dBm", sig);
+ }
+
+ wpa_supplicant_event(drv->ctx, EVENT_SIGNAL_CHANGE, &ed);
+}
+
+