wiphy: expose network objects instead of BSSes
The idea here is that network object will contain a list of BSS that have the same SSID and security setting. From user point of view, we will connect to a certain SSID instead of connecting directly to a BSS. We pick the best BSS automatically from the BSS list when connecting to a SSID.
This commit is contained in:
Jukka Rissanen
Denis Kenzior
parent
25d6dba008
commit
d27c947209
261
src/wiphy.c
261
src/wiphy.c
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@ -44,16 +44,20 @@ static struct l_genl *genl = NULL;
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static struct l_genl_family *nl80211 = NULL;
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static int scheduled_scan_interval = 60; /* in secs */
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struct bss {
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uint8_t addr[ETH_ALEN];
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uint32_t frequency;
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uint8_t *ssid;
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size_t ssid_len;
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};
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struct network {
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struct netdev *netdev;
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struct bss *bss;
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uint8_t *ssid;
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size_t ssid_len;
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enum scan_ssid_security ssid_security;
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struct l_queue *bss_list;
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};
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struct bss {
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struct network *network;
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uint8_t addr[ETH_ALEN];
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uint32_t frequency;
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int32_t signal_strength;
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uint16_t capability;
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};
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struct netdev {
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@ -101,15 +105,54 @@ static void do_debug(const char *str, void *user_data)
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l_info("%s%s", prefix, str);
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}
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static const char *iwd_network_get_path(const struct network *network)
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static const char *ssid_security_to_str(enum scan_ssid_security ssid_security)
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{
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switch (ssid_security) {
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case SCAN_SSID_SECURITY_NONE:
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return "open";
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case SCAN_SSID_SECURITY_WEP:
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return "wep";
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case SCAN_SSID_SECURITY_PSK:
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return "psk";
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case SCAN_SSID_SECURITY_8021X:
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return "8021x";
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}
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return NULL;
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}
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static const char *iwd_network_get_id(uint8_t *ssid, unsigned int ssid_len,
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enum scan_ssid_security ssid_security)
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{
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static char path[256];
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unsigned int i, pos = 0;
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for (i = 0; i < ssid_len && pos < sizeof(path); i++)
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pos += snprintf(path + pos, sizeof(path) - pos, "%02x",
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ssid[i]);
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pos += snprintf(path + pos, sizeof(path) - pos, "_%s",
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ssid_security_to_str(ssid_security));
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path[pos] = '\0';
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return path;
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}
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static char *iwd_network_get_path(struct network *network)
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{
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static char path[256];
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const char *id;
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int pos;
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pos = snprintf(path, sizeof(path), "%s/",
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iwd_device_get_path(network->netdev));
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id = iwd_network_get_id(network->ssid, network->ssid_len,
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network->ssid_security);
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strncpy(path + pos, id, sizeof(path) - pos);
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snprintf(path, sizeof(path), "%s/%02X%02X%02X%02X%02X%02X",
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iwd_device_get_path(network->netdev),
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network->bss->addr[0], network->bss->addr[1],
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network->bss->addr[2], network->bss->addr[3],
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network->bss->addr[4], network->bss->addr[5]);
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return path;
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}
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@ -118,8 +161,8 @@ static bool __iwd_network_append_properties(const struct network *network,
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{
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l_dbus_message_builder_enter_array(builder, "{sv}");
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dbus_dict_append_bytearray(builder, "SSID", network->bss->ssid,
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network->bss->ssid_len);
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dbus_dict_append_bytearray(builder, "SSID", network->ssid,
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network->ssid_len);
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l_dbus_message_builder_leave_array(builder);
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@ -151,7 +194,7 @@ static struct l_dbus_message *network_connect(struct l_dbus *dbus,
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{
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struct network *network = user_data;
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struct netdev *netdev = network->netdev;
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struct bss *bss = network->bss;
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struct bss *bss = l_queue_peek_head(network->bss_list);
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uint32_t auth_type = NL80211_AUTHTYPE_OPEN_SYSTEM;
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struct l_genl_msg *msg;
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struct l_dbus_message *reply;
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@ -160,7 +203,8 @@ static struct l_dbus_message *network_connect(struct l_dbus *dbus,
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msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
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msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ, 4, &bss->frequency);
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msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, bss->addr);
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msg_append_attr(msg, NL80211_ATTR_SSID, bss->ssid_len, bss->ssid);
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msg_append_attr(msg, NL80211_ATTR_SSID, network->ssid_len,
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network->ssid);
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msg_append_attr(msg, NL80211_ATTR_AUTH_TYPE, 4, &auth_type);
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l_genl_family_send(nl80211, msg, NULL, NULL, NULL);
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l_genl_msg_unref(msg);
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@ -233,6 +277,16 @@ static void network_emit_removed(struct network *network)
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l_dbus_send(dbus, signal);
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}
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static void bss_free(void *data)
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{
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struct bss *bss = data;
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l_debug("Freeing BSS %02X:%02X:%02X:%02X:%02X:%02X",
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bss->addr[0], bss->addr[1], bss->addr[2],
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bss->addr[3], bss->addr[4], bss->addr[5]);
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l_free(bss);
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}
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static void network_free(void *data)
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{
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struct network *network = data;
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@ -243,6 +297,8 @@ static void network_free(void *data)
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IWD_NETWORK_INTERFACE);
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network_emit_removed(network);
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l_queue_destroy(network->bss_list, bss_free);
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l_free(network->ssid);
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l_free(network);
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}
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@ -482,19 +538,6 @@ static bool bss_match(const void *a, const void *b)
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return !memcmp(bss_a->addr, bss_b->addr, sizeof(bss_a->addr));
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}
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static void bss_free(void *data)
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{
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struct bss *bss = data;
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l_debug("Freeing BSS %02X:%02X:%02X:%02X:%02X:%02X [%s]",
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bss->addr[0], bss->addr[1], bss->addr[2],
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bss->addr[3], bss->addr[4], bss->addr[5],
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util_ssid_to_utf8(bss->ssid_len, bss->ssid));
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l_free(bss->ssid);
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l_free(bss);
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}
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static void netdev_free(void *data)
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{
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struct netdev *netdev = data;
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@ -542,26 +585,33 @@ static bool wiphy_match(const void *a, const void *b)
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return (wiphy->id == id);
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}
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static void mlme_associate(struct netdev *netdev, struct bss *bss)
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static void mlme_associate(struct netdev *netdev, struct network *network)
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{
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struct l_genl_msg *msg;
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struct bss *bss;
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if (!bss) {
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bss = l_queue_peek_head(netdev->bss_list);
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if (!bss)
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return;
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if (!network) {
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l_error("Network to connect to is not known.");
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return;
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}
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bss = l_queue_peek_head(network->bss_list);
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if (!bss)
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return;
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msg = l_genl_msg_new_sized(NL80211_CMD_ASSOCIATE, 512);
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msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
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msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ, 4, &bss->frequency);
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msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, bss->addr);
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msg_append_attr(msg, NL80211_ATTR_SSID, bss->ssid_len, bss->ssid);
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msg_append_attr(msg, NL80211_ATTR_SSID, network->ssid_len,
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network->ssid);
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l_genl_family_send(nl80211, msg, NULL, NULL, NULL);
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l_genl_msg_unref(msg);
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}
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static bool parse_ie(struct bss *bss, const void *data, uint16_t len)
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static bool parse_ie(struct bss *bss, uint8_t **ssid, int *ssid_len,
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struct ie_rsn_info *rsne,
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const void *data, uint16_t len)
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{
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struct ie_tlv_iter iter;
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@ -569,6 +619,7 @@ static bool parse_ie(struct bss *bss, const void *data, uint16_t len)
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while (ie_tlv_iter_next(&iter)) {
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uint8_t tag = ie_tlv_iter_get_tag(&iter);
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int ret;
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switch (tag) {
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case IE_TYPE_SSID:
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@ -577,8 +628,17 @@ static bool parse_ie(struct bss *bss, const void *data, uint16_t len)
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return false;
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}
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bss->ssid_len = iter.len;
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bss->ssid = l_memdup(iter.data, iter.len);
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*ssid_len = iter.len;
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*ssid = l_memdup(iter.data, iter.len);
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break;
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case IE_TYPE_RSN:
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ret = ie_parse_rsne_from_data(iter.data - 2,
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iter.len + 2, rsne);
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if (ret < 0) {
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l_debug("Cannot parse RSN field (%d, %s)",
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ret, strerror(-ret));
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return false;
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}
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break;
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default:
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break;
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@ -588,12 +648,26 @@ static bool parse_ie(struct bss *bss, const void *data, uint16_t len)
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return true;
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}
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static int add_bss(const void *a, const void *b, void *user_data)
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{
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const struct bss *new_bss = a, *bss = b;
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if (new_bss->signal_strength > bss->signal_strength)
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return 1;
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return 0;
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}
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static void parse_bss(struct netdev *netdev, struct l_genl_attr *attr)
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{
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uint16_t type, len;
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const void *data;
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struct bss *bss;
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struct bss *old_bss;
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uint8_t *ssid = NULL;
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int ssid_len;
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struct network *network = NULL;
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struct ie_rsn_info rsne = { 0 };
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enum scan_ssid_security ssid_security;
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bss = l_new(struct bss, 1);
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@ -607,6 +681,14 @@ static void parse_bss(struct netdev *netdev, struct l_genl_attr *attr)
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memcpy(bss->addr, data, len);
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break;
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case NL80211_BSS_CAPABILITY:
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if (len != sizeof(uint16_t)) {
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l_warn("Invalid capability attribute");
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goto fail;
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}
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bss->capability = *((uint16_t *) data);
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break;
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case NL80211_BSS_FREQUENCY:
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if (len != sizeof(uint32_t)) {
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l_warn("Invalid frequency attribute");
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@ -615,8 +697,17 @@ static void parse_bss(struct netdev *netdev, struct l_genl_attr *attr)
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bss->frequency = *((uint32_t *) data);
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break;
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case NL80211_BSS_SIGNAL_MBM:
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if (len != sizeof(int32_t)) {
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l_warn("Invalid signal strength attribute");
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goto fail;
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}
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bss->signal_strength = *((int32_t *) data);
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break;
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case NL80211_BSS_INFORMATION_ELEMENTS:
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if (!parse_ie(bss, data, len)) {
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if (!parse_ie(bss, &ssid, &ssid_len, &rsne, data,
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len)) {
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l_warn("Could not parse BSS IEs");
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goto fail;
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}
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@ -625,50 +716,70 @@ static void parse_bss(struct netdev *netdev, struct l_genl_attr *attr)
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}
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}
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old_bss = l_queue_remove_if(netdev->old_bss_list, bss_match, bss);
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if (ssid) {
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bool network_found = false;
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const char *id;
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if (!old_bss) {
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struct network *network;
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ssid_security = scan_get_ssid_security(bss->capability, &rsne);
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l_debug("Found new BSS '%s' with SSID: %s, freq: %u",
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bss_address_to_string(bss),
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util_ssid_to_utf8(bss->ssid_len, bss->ssid),
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bss->frequency);
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id = iwd_network_get_id(ssid, ssid_len, ssid_security);
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network = l_new(struct network, 1);
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network->bss = bss;
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network->netdev = netdev;
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network = l_hashmap_lookup(netdev->networks, id);
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if (!network) {
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l_debug("Found new SSID \"%s\" security %s",
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util_ssid_to_utf8(ssid_len, ssid),
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ssid_security_to_str(ssid_security));
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l_hashmap_insert(netdev->networks, bss_address_to_string(bss),
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network);
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network = l_new(struct network, 1);
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network->netdev = netdev;
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network->ssid = ssid;
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network->ssid_len = ssid_len;
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network->ssid_security = ssid_security;
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network->bss_list = l_queue_new();
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if (!l_dbus_register_interface(dbus_get_bus(),
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network_found = true;
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l_hashmap_insert(netdev->networks, id, network);
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if (!l_dbus_register_interface(dbus_get_bus(),
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iwd_network_get_path(network),
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IWD_NETWORK_INTERFACE,
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setup_network_interface,
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network, NULL))
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l_info("Unable to register %s interface",
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IWD_NETWORK_INTERFACE);
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else
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network_emit_added(network);
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} else {
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struct network *network;
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l_info("Unable to register %s interface",
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IWD_NETWORK_INTERFACE);
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else
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network_emit_added(network);
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}
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l_debug("Found existing BSS '%s'",
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if (!l_queue_find(network->bss_list, bss_match, bss)) {
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struct bss *new_bss;
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l_debug("Found new BSS '%s' with SSID: %s, freq: %u, "
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"strength: %i",
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bss_address_to_string(bss),
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util_ssid_to_utf8(ssid_len, ssid),
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bss->frequency, bss->signal_strength);
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new_bss = l_memdup(bss, sizeof(*bss));
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new_bss->network = network;
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l_queue_insert(network->bss_list, new_bss,
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add_bss, NULL);
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} else {
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l_debug("Found existing BSS '%s'",
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bss_address_to_string(bss));
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}
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network = l_hashmap_lookup(netdev->networks,
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bss_address_to_string(bss));
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if (network)
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network->bss = bss;
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bss_free(old_bss);
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if (!network_found)
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l_free(ssid);
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}
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l_queue_push_head(netdev->bss_list, bss);
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return;
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fail:
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l_free(ssid);
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bss_free(bss);
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}
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@ -721,23 +832,9 @@ static void get_scan_callback(struct l_genl_msg *msg, void *user_data)
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static void get_scan_done(void *user)
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{
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struct netdev *netdev = user;
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const struct l_queue_entry *bss_entry;
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l_debug("get_scan_done for netdev: %p", netdev);
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for (bss_entry = l_queue_get_entries(netdev->old_bss_list); bss_entry;
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bss_entry = bss_entry->next) {
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struct bss *bss = bss_entry->data;
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struct network *network;
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l_debug("Lost BSS '%s' with SSID: %s",
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bss_address_to_string(bss),
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util_ssid_to_utf8(bss->ssid_len, bss->ssid));
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network = l_hashmap_remove(netdev->networks,
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bss_address_to_string(bss));
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network_free(network);
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}
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l_queue_destroy(netdev->old_bss_list, bss_free);
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netdev->old_bss_list = NULL;
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}
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