hostapd: Add survey dump support
This adds survey dump support for all frequencies and for specific desired frequencies. This will later be used by ACS code for spectrum heuristics. Signed-hostap: Michal Kazior <michal.kazior@tieto.com>
This commit is contained in:
Michal Kazior
Jouni Malinen
parent
245e026ec8
commit
0185007c2e
6 changed files with 365 additions and 2 deletions
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@ -225,4 +225,14 @@ static inline void hostapd_drv_poll_client(struct hostapd_data *hapd,
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hapd->driver->poll_client(hapd->drv_priv, own_addr, addr, qos);
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}
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static inline int hostapd_drv_get_survey(struct hostapd_data *hapd,
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unsigned int freq)
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{
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if (hapd->driver == NULL)
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return -1;
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if (!hapd->driver->get_survey)
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return -1;
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return hapd->driver->get_survey(hapd->drv_priv, freq);
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}
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#endif /* AP_DRV_OPS */
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@ -715,6 +715,72 @@ static void hostapd_event_eapol_rx(struct hostapd_data *hapd, const u8 *src,
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}
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static struct hostapd_channel_data * hostapd_get_mode_channel(
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struct hostapd_iface *iface, unsigned int freq)
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{
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int i;
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struct hostapd_channel_data *chan;
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for (i = 0; i < iface->current_mode->num_channels; i++) {
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chan = &iface->current_mode->channels[i];
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if (!chan)
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return NULL;
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if ((unsigned int) chan->freq == freq)
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return chan;
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}
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return NULL;
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}
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static void hostapd_update_nf(struct hostapd_iface *iface,
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struct hostapd_channel_data *chan,
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struct freq_survey *survey)
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{
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if (!iface->chans_surveyed) {
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chan->min_nf = survey->nf;
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iface->lowest_nf = survey->nf;
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} else {
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if (dl_list_empty(&chan->survey_list))
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chan->min_nf = survey->nf;
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else if (survey->nf < chan->min_nf)
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chan->min_nf = survey->nf;
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if (survey->nf < iface->lowest_nf)
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iface->lowest_nf = survey->nf;
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}
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}
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static void hostapd_event_get_survey(struct hostapd_data *hapd,
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struct survey_results *survey_results)
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{
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struct hostapd_iface *iface = hapd->iface;
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struct freq_survey *survey, *tmp;
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struct hostapd_channel_data *chan;
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if (dl_list_empty(&survey_results->survey_list)) {
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wpa_printf(MSG_DEBUG, "No survey data received");
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return;
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}
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dl_list_for_each_safe(survey, tmp, &survey_results->survey_list,
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struct freq_survey, list) {
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chan = hostapd_get_mode_channel(iface, survey->freq);
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if (!chan)
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continue;
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if (chan->flag & HOSTAPD_CHAN_DISABLED)
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continue;
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dl_list_del(&survey->list);
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dl_list_add_tail(&chan->survey_list, &survey->list);
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hostapd_update_nf(iface, chan, survey);
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iface->chans_surveyed++;
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}
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}
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void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
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union wpa_event_data *data)
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{
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@ -856,6 +922,9 @@ void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
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hapd, data->connect_failed_reason.addr,
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data->connect_failed_reason.code);
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break;
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case EVENT_SURVEY:
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hostapd_event_get_survey(hapd, &data->survey_results);
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break;
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default:
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wpa_printf(MSG_DEBUG, "Unknown event %d", event);
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break;
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@ -301,6 +301,15 @@ struct hostapd_iface {
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int olbc_ht;
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u16 ht_op_mode;
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/* surveying helpers */
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/* number of channels surveyed */
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unsigned int chans_surveyed;
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/* lowest observed noise floor in dBm */
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s8 lowest_nf;
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void (*scan_cb)(struct hostapd_iface *iface);
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};
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@ -20,6 +20,7 @@
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#define WPA_SUPPLICANT_DRIVER_VERSION 4
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#include "common/defs.h"
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#include "utils/list.h"
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#define HOSTAPD_CHAN_DISABLED 0x00000001
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#define HOSTAPD_CHAN_PASSIVE_SCAN 0x00000002
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@ -55,9 +56,20 @@ struct hostapd_channel_data {
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int flag;
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/**
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* max_tx_power - maximum transmit power in dBm
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* max_tx_power - Maximum transmit power in dBm
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*/
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u8 max_tx_power;
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/*
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* survey_list - Linked list of surveys
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*/
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struct dl_list survey_list;
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/**
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* min_nf - Minimum observed noise floor, in dBm, based on all
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* surveyed channel data
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*/
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s8 min_nf;
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};
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#define HOSTAPD_MODE_FLAG_HT_INFO_KNOWN BIT(0)
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@ -2728,6 +2740,31 @@ struct wpa_driver_ops {
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* mode.
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*/
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int (*stop_ap)(void *priv);
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/**
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* get_survey - Retrieve survey data
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* @priv: Private driver interface data
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* @freq: If set, survey data for the specified frequency is only
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* being requested. If not set, all survey data is requested.
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* Returns: 0 on success, -1 on failure
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*
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* Use this to retrieve:
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*
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* - the observed channel noise floor
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* - the amount of time we have spent on the channel
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* - the amount of time during which we have spent on the channel that
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* the radio has determined the medium is busy and we cannot
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* transmit
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* - the amount of time we have spent receiving data
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* - the amount of time we have spent transmitting data
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*
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* This data can be used for spectrum heuristics. One example is
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* Automatic Channel Selection (ACS). The channel survey data is
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* kept on a linked list on the channel data, one entry is added
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* for each survey. The min_nf of the channel is updated for each
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* survey.
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*/
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int (*get_survey)(void *priv, unsigned int freq);
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};
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@ -3212,10 +3249,56 @@ enum wpa_event_type {
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*
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* The channel which was previously unavailable is now available again.
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*/
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EVENT_DFS_NOP_FINISHED
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EVENT_DFS_NOP_FINISHED,
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/*
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* EVENT_SURVEY - Received survey data
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*
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* This event gets triggered when a driver query is issued for survey
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* data and the requested data becomes available. The returned data is
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* stored in struct survey_results. The results provide at most one
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* survey entry for each frequency and at minimum will provide one survey
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* entry for one frequency. The survey data can be os_malloc()'d and
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* then os_free()'d, so the event callback must only copy data.
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*/
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EVENT_SURVEY
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};
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/**
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* struct freq_survey - Channel survey info
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*
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* @ifidx: Interface index in which this survey was observed
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* @freq: Center of frequency of the surveyed channel
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* @nf: Channel noise floor in dBm
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* @channel_time: Amount of time in ms the radio spent on the channel
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* @channel_time_busy: Amount of time in ms the radio detected some signal
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* that indicated to the radio the channel was not clear
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* @channel_time_rx: Amount of time the radio spent receiving data
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* @channel_time_tx: Amount of time the radio spent transmitting data
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* @filled: bitmask indicating which fields have been reported, see
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* SURVEY_HAS_* defines.
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* @list: Internal list pointers
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*/
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struct freq_survey {
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u32 ifidx;
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unsigned int freq;
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s8 nf;
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u64 channel_time;
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u64 channel_time_busy;
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u64 channel_time_rx;
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u64 channel_time_tx;
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unsigned int filled;
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struct dl_list list;
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};
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#define SURVEY_HAS_NF BIT(0)
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#define SURVEY_HAS_CHAN_TIME BIT(1)
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#define SURVEY_HAS_CHAN_TIME_BUSY BIT(2)
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#define SURVEY_HAS_CHAN_TIME_RX BIT(3)
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#define SURVEY_HAS_CHAN_TIME_TX BIT(4)
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/**
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* union wpa_event_data - Additional data for wpa_supplicant_event() calls
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*/
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@ -3858,6 +3941,17 @@ union wpa_event_data {
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struct dfs_event {
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int freq;
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} dfs_event;
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/**
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* survey_results - Survey result data for EVENT_SURVEY
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* @freq_filter: Requested frequency survey filter, 0 if request
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* was for all survey data
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* @survey_list: Linked list of survey data
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*/
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struct survey_results {
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unsigned int freq_filter;
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struct dl_list survey_list; /* struct freq_survey */
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} survey_results;
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};
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/**
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@ -84,6 +84,7 @@ const char * event_to_string(enum wpa_event_type event)
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E2S(DFS_CAC_FINISHED);
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E2S(DFS_CAC_ABORTED);
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E2S(DFS_NOP_FINISHED);
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E2S(SURVEY);
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}
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return "UNKNOWN";
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@ -9971,6 +9971,185 @@ static int nl80211_flush_pmkid(void *priv)
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}
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static void clean_survey_results(struct survey_results *survey_results)
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{
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struct freq_survey *survey, *tmp;
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if (dl_list_empty(&survey_results->survey_list))
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return;
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dl_list_for_each_safe(survey, tmp, &survey_results->survey_list,
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struct freq_survey, list) {
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dl_list_del(&survey->list);
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os_free(survey);
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}
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}
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static void add_survey(struct nlattr **sinfo, u32 ifidx,
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struct dl_list *survey_list)
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{
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struct freq_survey *survey;
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survey = os_zalloc(sizeof(struct freq_survey));
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if (!survey)
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return;
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survey->ifidx = ifidx;
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survey->freq = nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]);
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survey->filled = 0;
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if (sinfo[NL80211_SURVEY_INFO_NOISE]) {
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survey->nf = (int8_t)
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nla_get_u8(sinfo[NL80211_SURVEY_INFO_NOISE]);
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survey->filled |= SURVEY_HAS_NF;
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}
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if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME]) {
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survey->channel_time =
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nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME]);
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survey->filled |= SURVEY_HAS_CHAN_TIME;
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}
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if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_BUSY]) {
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survey->channel_time_busy =
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nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_BUSY]);
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survey->filled |= SURVEY_HAS_CHAN_TIME_BUSY;
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}
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if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_RX]) {
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survey->channel_time_rx =
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nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_RX]);
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survey->filled |= SURVEY_HAS_CHAN_TIME_RX;
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}
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if (sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_TX]) {
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survey->channel_time_tx =
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nla_get_u64(sinfo[NL80211_SURVEY_INFO_CHANNEL_TIME_TX]);
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survey->filled |= SURVEY_HAS_CHAN_TIME_TX;
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}
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wpa_printf(MSG_DEBUG, "nl80211: Freq survey dump event (freq=%d MHz noise=%d channel_time=%ld busy_time=%ld tx_time=%ld rx_time=%ld filled=%04x)",
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survey->freq,
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survey->nf,
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(unsigned long int) survey->channel_time,
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(unsigned long int) survey->channel_time_busy,
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(unsigned long int) survey->channel_time_tx,
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(unsigned long int) survey->channel_time_rx,
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survey->filled);
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dl_list_add_tail(survey_list, &survey->list);
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}
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static int check_survey_ok(struct nlattr **sinfo, u32 surveyed_freq,
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unsigned int freq_filter)
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{
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if (!freq_filter)
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return 1;
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return freq_filter == surveyed_freq;
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}
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static int survey_handler(struct nl_msg *msg, void *arg)
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{
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struct nlattr *tb[NL80211_ATTR_MAX + 1];
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struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
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struct nlattr *sinfo[NL80211_SURVEY_INFO_MAX + 1];
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struct survey_results *survey_results;
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u32 surveyed_freq = 0;
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u32 ifidx;
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static struct nla_policy survey_policy[NL80211_SURVEY_INFO_MAX + 1] = {
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[NL80211_SURVEY_INFO_FREQUENCY] = { .type = NLA_U32 },
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[NL80211_SURVEY_INFO_NOISE] = { .type = NLA_U8 },
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};
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survey_results = (struct survey_results *) arg;
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nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
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genlmsg_attrlen(gnlh, 0), NULL);
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ifidx = nla_get_u32(tb[NL80211_ATTR_IFINDEX]);
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if (!tb[NL80211_ATTR_SURVEY_INFO])
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return NL_SKIP;
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if (nla_parse_nested(sinfo, NL80211_SURVEY_INFO_MAX,
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tb[NL80211_ATTR_SURVEY_INFO],
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survey_policy))
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return NL_SKIP;
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if (!sinfo[NL80211_SURVEY_INFO_FREQUENCY]) {
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wpa_printf(MSG_ERROR, "nl80211: Invalid survey data");
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return NL_SKIP;
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}
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surveyed_freq = nla_get_u32(sinfo[NL80211_SURVEY_INFO_FREQUENCY]);
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if (!check_survey_ok(sinfo, surveyed_freq,
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survey_results->freq_filter))
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return NL_SKIP;
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if (survey_results->freq_filter &&
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survey_results->freq_filter != surveyed_freq) {
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wpa_printf(MSG_EXCESSIVE, "nl80211: Ignoring survey data for freq %d MHz",
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surveyed_freq);
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return NL_SKIP;
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}
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add_survey(sinfo, ifidx, &survey_results->survey_list);
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return NL_SKIP;
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}
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static int wpa_driver_nl80211_get_survey(void *priv, unsigned int freq)
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{
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struct i802_bss *bss = priv;
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struct wpa_driver_nl80211_data *drv = bss->drv;
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struct nl_msg *msg;
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int err = -ENOBUFS;
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union wpa_event_data data;
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struct survey_results *survey_results;
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os_memset(&data, 0, sizeof(data));
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survey_results = &data.survey_results;
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dl_list_init(&survey_results->survey_list);
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msg = nlmsg_alloc();
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if (!msg)
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goto nla_put_failure;
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nl80211_cmd(drv, msg, NLM_F_DUMP, NL80211_CMD_GET_SURVEY);
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NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
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if (freq)
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data.survey_results.freq_filter = freq;
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do {
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wpa_printf(MSG_DEBUG, "nl80211: Fetch survey data");
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err = send_and_recv_msgs(drv, msg, survey_handler,
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survey_results);
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} while (err > 0);
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if (err) {
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wpa_printf(MSG_ERROR, "nl80211: Failed to process survey data");
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goto out_clean;
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}
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wpa_supplicant_event(drv->ctx, EVENT_SURVEY, &data);
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out_clean:
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clean_survey_results(survey_results);
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nla_put_failure:
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return err;
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}
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static void nl80211_set_rekey_info(void *priv, const u8 *kek, const u8 *kck,
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const u8 *replay_ctr)
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{
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@ -10597,4 +10776,5 @@ const struct wpa_driver_ops wpa_driver_nl80211_ops = {
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#endif /* CONFIG_TDLS */
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.update_ft_ies = wpa_driver_nl80211_update_ft_ies,
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.get_mac_addr = wpa_driver_nl80211_get_macaddr,
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.get_survey = wpa_driver_nl80211_get_survey,
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};
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