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netdev: add netdev_get_station/current_station

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This adds a generalized API for GET_STATION. This API handles
calling and parsing the results into a new structure,
netdev_station_info. This results structure will hold any
data needed by consumers of netdev_get_station. A helper API
(netdev_get_current_station) was added as a convenience which
automatically passes handshake->aa as the MAC.

For now only the RSSI is parsed as this is already being
done for RSSI polling/events. Looking further more info will
be added such as rx/tx rates and estimated throughput.
This commit is contained in:
James Prestwood 2021-01-12 09:17:17 -08:00 committed by Denis Kenzior
parent 09b124f073
commit cf17d42972
2 changed files with 139 additions and 0 deletions
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122
src/netdev.c
View File

@ -132,6 +132,11 @@ struct netdev {
void *set_powered_user_data;
netdev_destroy_func_t set_powered_destroy;
uint32_t get_station_cmd_id;
netdev_get_station_cb_t get_station_cb;
void *get_station_data;
netdev_destroy_func_t get_station_destroy;
struct watchlist station_watches;
struct l_io *pae_io; /* for drivers without EAPoL over NL80211 */
@ -363,6 +368,28 @@ int netdev_set_powered(struct netdev *netdev, bool powered,
return 0;
}
static bool netdev_parse_sta_info(struct l_genl_attr *attr,
struct netdev_station_info *info)
{
uint16_t type, len;
const void *data;
while (l_genl_attr_next(attr, &type, &len, &data)) {
switch (type) {
case NL80211_STA_INFO_SIGNAL_AVG:
if (len != 1)
return false;
info->cur_rssi = *(const int8_t *) data;
info->have_cur_rssi = true;
break;
}
}
return true;
}
static void netdev_set_rssi_level_idx(struct netdev *netdev)
{
uint8_t new_level;
@ -636,6 +663,11 @@ static void netdev_free(void *data)
netdev->mac_change_cmd_id = 0;
}
if (netdev->get_station_cmd_id) {
l_genl_family_cancel(nl80211, netdev->get_station_cmd_id);
netdev->get_station_cmd_id = 0;
}
if (netdev->events_ready)
WATCHLIST_NOTIFY(&netdev_watches, netdev_watch_func_t,
netdev, NETDEV_WATCH_EVENT_DEL);
@ -4022,6 +4054,96 @@ done:
return 0;
}
static void netdev_get_station_cb(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;
struct netdev_station_info info;
netdev->get_station_cmd_id = 0;
if (!l_genl_attr_init(&attr, msg))
goto parse_error;
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_ATTR_STA_INFO:
if (!l_genl_attr_recurse(&attr, &nested))
goto parse_error;
if (!netdev_parse_sta_info(&nested, &info))
goto parse_error;
break;
case NL80211_ATTR_MAC:
if (len != 6)
goto parse_error;
memcpy(info.addr, data, 6);
break;
}
}
if (netdev->get_station_cb)
netdev->get_station_cb(&info, netdev->get_station_data);
return;
parse_error:
if (netdev->get_station_cb)
netdev->get_station_cb(NULL, netdev->get_station_data);
}
static void netdev_get_station_destroy(void *user_data)
{
struct netdev *netdev = user_data;
netdev->get_station_cmd_id = 0;
if (netdev->get_station_destroy)
netdev->get_station_destroy(netdev->get_station_data);
}
int netdev_get_station(struct netdev *netdev, const uint8_t *mac,
netdev_get_station_cb_t cb, void *user_data,
netdev_destroy_func_t destroy)
{
struct l_genl_msg *msg;
if (netdev->get_station_cmd_id)
return -EBUSY;
msg = l_genl_msg_new_sized(NL80211_CMD_GET_STATION, 64);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, mac);
netdev->get_station_cmd_id = l_genl_family_send(nl80211, msg,
netdev_get_station_cb, netdev,
netdev_get_station_destroy);
if (!netdev->get_station_cmd_id) {
l_genl_msg_unref(msg);
return -EIO;
}
netdev->get_station_cb = cb;
netdev->get_station_data = user_data;
netdev->get_station_destroy = destroy;
return 0;
}
int netdev_get_current_station(struct netdev *netdev,
netdev_get_station_cb_t cb, void *user_data,
netdev_destroy_func_t destroy)
{
return netdev_get_station(netdev, netdev->handshake->aa, cb,
user_data, destroy);
}
static int netdev_cqm_rssi_update(struct netdev *netdev)
{
struct l_genl_msg *msg;

17
src/netdev.h
View File

@ -114,6 +114,16 @@ typedef void (*netdev_station_watch_func_t)(struct netdev *netdev,
const uint8_t *mac, bool added,
void *user_data);
struct netdev_station_info {
uint8_t addr[6];
int8_t cur_rssi;
bool have_cur_rssi : 1;
};
typedef void (*netdev_get_station_cb_t)(const struct netdev_station_info *info,
void *user_data);
struct wiphy *netdev_get_wiphy(struct netdev *netdev);
const uint8_t *netdev_get_address(struct netdev *netdev);
uint32_t netdev_get_ifindex(struct netdev *netdev);
@ -174,6 +184,13 @@ int netdev_neighbor_report_req(struct netdev *netdev,
int netdev_set_rssi_report_levels(struct netdev *netdev, const int8_t *levels,
size_t levels_num);
int netdev_get_station(struct netdev *netdev, const uint8_t *mac,
netdev_get_station_cb_t cb, void *user_data,
netdev_destroy_func_t destroy);
int netdev_get_current_station(struct netdev *netdev,
netdev_get_station_cb_t cb, void *user_data,
netdev_destroy_func_t destroy);
void netdev_handshake_failed(struct handshake_state *hs, uint16_t reason_code);
struct netdev *netdev_find(int ifindex);