wiphy: Move scan result parsing to scan.c

src/scan.c

@@ -99,6 +99,160 @@ enum scan_ssid_security scan_get_ssid_security(
 	return SCAN_SSID_SECURITY_NONE;
 }
 
+static bool scan_parse_bss_information_elements(struct scan_bss *bss,
+					const uint8_t **ssid, uint8_t *ssid_len,
+					const void *data, uint16_t len)
+{
+	struct ie_tlv_iter iter;
+
+	ie_tlv_iter_init(&iter, data, len);
+
+	while (ie_tlv_iter_next(&iter)) {
+		uint8_t tag = ie_tlv_iter_get_tag(&iter);
+
+		switch (tag) {
+		case IE_TYPE_SSID:
+			if (iter.len > 32)
+				return false;
+
+			*ssid_len = iter.len;
+			*ssid = iter.data;
+			break;
+		case IE_TYPE_RSN:
+			if (!bss->rsne)
+				bss->rsne = l_memdup(iter.data - 2,
+								iter.len + 2);
+			break;
+		case IE_TYPE_VENDOR_SPECIFIC:
+			/* Interested only in WPA IE from Vendor data */
+			if (!bss->wpa && is_ie_wpa_ie(iter.data, iter.len))
+				bss->wpa = l_memdup(iter.data - 2,
+								iter.len + 2);
+			break;
+		}
+	}
+
+	return true;
+}
+
+static struct scan_bss *scan_parse_attr_bss(struct l_genl_attr *attr,
+						const uint8_t **ssid,
+						uint8_t *ssid_len)
+{
+	uint16_t type, len;
+	const void *data;
+	struct scan_bss *bss;
+
+	bss = l_new(struct scan_bss, 1);
+
+	while (l_genl_attr_next(attr, &type, &len, &data)) {
+		switch (type) {
+		case NL80211_BSS_BSSID:
+			if (len != sizeof(bss->addr))
+				goto fail;
+
+			memcpy(bss->addr, data, len);
+			break;
+		case NL80211_BSS_CAPABILITY:
+			if (len != sizeof(uint16_t))
+				goto fail;
+
+			bss->capability = *((uint16_t *) data);
+			break;
+		case NL80211_BSS_FREQUENCY:
+			if (len != sizeof(uint32_t))
+				goto fail;
+
+			bss->frequency = *((uint32_t *) data);
+			break;
+		case NL80211_BSS_SIGNAL_MBM:
+			if (len != sizeof(int32_t))
+				goto fail;
+
+			bss->signal_strength = *((int32_t *) data);
+			break;
+		case NL80211_BSS_INFORMATION_ELEMENTS:
+			if (!scan_parse_bss_information_elements(bss,
+						ssid, ssid_len, data, len))
+				goto fail;
+
+			break;
+		}
+	}
+
+	return bss;
+
+fail:
+	scan_bss_free(bss);
+	return NULL;
+}
+
+struct scan_bss *scan_parse_result(struct l_genl_msg *msg,
+					uint32_t *out_ifindex,
+					uint64_t *out_wdev,
+					const uint8_t **out_ssid,
+					uint8_t *out_ssid_len)
+{
+	struct l_genl_attr attr, nested;
+	uint16_t type, len;
+	const void *data;
+	uint32_t ifindex;
+	uint64_t wdev;
+	struct scan_bss *bss = NULL;
+	const uint8_t *ssid = NULL;
+	uint8_t ssid_len = 0;
+
+	if (!l_genl_attr_init(&attr, msg))
+		return NULL;
+
+	while (l_genl_attr_next(&attr, &type, &len, &data)) {
+		switch (type) {
+		case NL80211_ATTR_IFINDEX:
+			if (len != sizeof(uint32_t))
+				return NULL;
+
+			ifindex = *((uint32_t *) data);
+			break;
+
+		case NL80211_ATTR_WDEV:
+			if (len != sizeof(uint64_t))
+				return NULL;
+
+			wdev = *((uint64_t *) data);
+			break;
+
+		case NL80211_ATTR_BSS:
+			if (!l_genl_attr_recurse(&attr, &nested))
+				return NULL;
+
+			bss = scan_parse_attr_bss(&nested, &ssid, &ssid_len);
+			break;
+		}
+	}
+
+	if (!bss)
+		return NULL;
+
+	if (!ssid) {
+		scan_bss_free(bss);
+		return NULL;
+	}
+
+	if (out_ifindex)
+		*out_ifindex = ifindex;
+
+	if (out_wdev)
+		*out_wdev = wdev;
+
+	if (out_ssid_len)
+		*out_ssid_len = ssid_len;
+
+	if (out_ssid)
+		*out_ssid = ssid;
+
+	return bss;
+}
+
 void scan_bss_free(struct scan_bss *bss)
 {
 	l_free(bss->rsne);

src/scan.h

@@ -53,3 +53,9 @@ void scan_get_results(struct l_genl_family *nl80211, uint32_t ifindex,
 enum scan_ssid_security scan_get_ssid_security(enum ie_bss_capability bss_cap,
 						const struct ie_rsn_info *info);
 void scan_bss_free(struct scan_bss *bss);
+
+struct scan_bss *scan_parse_result(struct l_genl_msg *msg,
+					uint32_t *out_ifindex,
+					uint64_t *out_wdev,
+					const uint8_t **out_ssid,
+					uint8_t *out_ssid_len);

src/wiphy.c

@@ -1338,45 +1338,6 @@ static void mlme_cqm_event(struct l_genl_msg *msg, struct netdev *netdev)
 	}
 }
 
-static bool parse_ie(struct scan_bss *bss, const uint8_t **ssid, int *ssid_len,
-						const void *data, uint16_t len)
-{
-	struct ie_tlv_iter iter;
-
-	ie_tlv_iter_init(&iter, data, len);
-
-	while (ie_tlv_iter_next(&iter)) {
-		uint8_t tag = ie_tlv_iter_get_tag(&iter);
-
-		switch (tag) {
-		case IE_TYPE_SSID:
-			if (iter.len > 32) {
-				l_warn("Got SSID > 32");
-				return false;
-			}
-
-			*ssid_len = iter.len;
-			*ssid = iter.data;
-			break;
-		case IE_TYPE_RSN:
-			if (!bss->rsne)
-				bss->rsne = l_memdup(iter.data - 2,
-								iter.len + 2);
-			break;
-		case IE_TYPE_VENDOR_SPECIFIC:
-			/* Interested only in WPA IE from Vendor data */
-			if (!bss->wpa && is_ie_wpa_ie(iter.data, iter.len))
-				bss->wpa = l_memdup(iter.data - 2,
-								iter.len + 2);
-			break;
-		default:
-			break;
-		}
-	}
-
-	return true;
-}
-
 static int add_bss(const void *a, const void *b, void *user_data)
 {
 	const struct scan_bss *new_bss = a, *bss = b;
@@ -1387,67 +1348,41 @@ static int add_bss(const void *a, const void *b, void *user_data)
 	return 0;
 }
 
-static void parse_bss(struct netdev *netdev, struct l_genl_attr *attr)
+static void network_reset_bss_list(const void *key, void *value,
+					void *user_data)
 {
-	uint16_t type, len;
+	struct network *network = value;
-	const void *data;
+
+	l_queue_destroy(network->bss_list, NULL);
+	network->bss_list = l_queue_new();
+}
+
+static void get_scan_callback(struct l_genl_msg *msg, void *user_data)
+{
+	struct netdev *netdev = user_data;
 	struct scan_bss *bss;
-	const uint8_t *ssid = NULL;
+	uint32_t ifindex;
-	int ssid_len;
+	const uint8_t *ssid;
+	uint8_t ssid_len;
 	struct network *network;
 	enum scan_ssid_security ssid_security;
 	const char *path;
 
-	bss = l_new(struct scan_bss, 1);
+	l_debug("get_scan_callback");
 
-	while (l_genl_attr_next(attr, &type, &len, &data)) {
+	if (!netdev->old_bss_list) {
-		switch (type) {
+		netdev->old_bss_list = netdev->bss_list;
-		case NL80211_BSS_BSSID:
+		netdev->bss_list = l_queue_new();
-			if (len != sizeof(bss->addr)) {
+		l_hashmap_foreach(netdev->networks,
-				l_warn("Invalid BSSID attribute");
+					network_reset_bss_list, NULL);
+	}
+
+	bss = scan_parse_result(msg, &ifindex, NULL, &ssid, &ssid_len);
+	if (!bss)
+		return;
+
+	if (ifindex != netdev->index)
 		goto fail;
-			}
-
-			memcpy(bss->addr, data, len);
-			break;
-		case NL80211_BSS_CAPABILITY:
-			if (len != sizeof(uint16_t)) {
-				l_warn("Invalid capability attribute");
-				goto fail;
-			}
-
-			bss->capability = *((uint16_t *) data);
-			break;
-		case NL80211_BSS_FREQUENCY:
-			if (len != sizeof(uint32_t)) {
-				l_warn("Invalid frequency attribute");
-				goto fail;
-			}
-
-			bss->frequency = *((uint32_t *) data);
-			break;
-		case NL80211_BSS_SIGNAL_MBM:
-			if (len != sizeof(int32_t)) {
-				l_warn("Invalid signal strength attribute");
-				goto fail;
-			}
-
-			bss->signal_strength = *((int32_t *) data);
-			break;
-		case NL80211_BSS_INFORMATION_ELEMENTS:
-			if (!parse_ie(bss, &ssid, &ssid_len, data, len)) {
-				l_warn("Could not parse BSS IEs");
-				goto fail;
-			}
-
-			break;
-		}
-	}
-
-	if (!ssid) {
-		l_warn("Received BSS but SSID IE returned NULL -- ignoring");
-		goto fail;
-	}
 
 	if (!util_ssid_is_utf8(ssid_len, ssid)) {
 		l_warn("Ignoring Network with non-UTF8 SSID '%s'",
@@ -1455,15 +1390,6 @@ static void parse_bss(struct netdev *netdev, struct l_genl_attr *attr)
 		goto fail;
 	}
 
-	/*
-	 * TODO: Check whether WPA element is present
-	 *
-	 * If we have the RSN element, try to parse it and figure out the
-	 * security parameters.
-	 *
-	 * Length was already validated by parse_ie, so use the one from the
-	 * IE directly.
-	 */
 	if (bss->rsne) {
 		struct ie_rsn_info rsne;
 		int res = ie_parse_rsne_from_data(bss->rsne, bss->rsne[1] + 2,
@@ -1529,63 +1455,7 @@ static void parse_bss(struct netdev *netdev, struct l_genl_attr *attr)
 
 fail:
 	bss_free(bss);
-}
 
-static void network_reset_bss_list(const void *key, void *value,
-					void *user_data)
-{
-	struct network *network = value;
-
-	l_queue_destroy(network->bss_list, NULL);
-	network->bss_list = l_queue_new();
-}
-
-static void get_scan_callback(struct l_genl_msg *msg, void *user_data)
-{
-	struct netdev *netdev = user_data;
-	struct l_genl_attr attr, nested;
-	uint16_t type, len;
-	const void *data;
-
-	l_debug("get_scan_callback");
-
-	if (!l_genl_attr_init(&attr, msg))
-		return;
-
-	if (!netdev->old_bss_list) {
-		netdev->old_bss_list = netdev->bss_list;
-		netdev->bss_list = l_queue_new();
-		l_hashmap_foreach(netdev->networks,
-					network_reset_bss_list, NULL);
-	}
-
-	while (l_genl_attr_next(&attr, &type, &len, &data)) {
-		switch (type) {
-		case NL80211_ATTR_IFINDEX:
-			if (len != sizeof(uint32_t)) {
-				l_warn("Invalid interface index attribute");
-				return;
-			}
-
-			if (netdev->index != *((uint32_t *) data)) {
-				l_warn("ifindex mismatch");
-				return;
-			}
-
-			break;
-		case NL80211_ATTR_BSS:
-			if (!netdev) {
-				l_warn("No interface structure found");
-				return;
-			}
-
-			if (!l_genl_attr_recurse(&attr, &nested))
-				return;
-
-			parse_bss(netdev, &nested);
-			break;
-		}
-	}
 }
 
 static bool network_remove_if_lost(const void *key, void *data, void *user_data)