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hostapd: Add airtime policy configuration support

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This adds support to hostapd for configuring airtime policy settings for
stations as they connect to the access point. This is the userspace
component of the airtime policy enforcement system PoliFi described in
this paper: https://arxiv.org/abs/1902.03439

The Linux kernel part has been merged into mac80211 for the 5.1 dev
cycle.

The configuration mechanism has three modes: Static, dynamic and limit.
In static mode, weights can be set in the configuration file for
individual MAC addresses, which will be applied when the configured
stations connect.

In dynamic mode, weights are instead set per BSS, which will be scaled
by the number of active stations on that BSS, achieving the desired
aggregate weighing between the configured BSSes. Limit mode works like
dynamic mode, except that any BSS *not* marked as 'limited' is allowed
to exceed its configured share if a per-station fairness share would
assign more airtime to that BSS. See the paper for details on these
modes.

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
This commit is contained in:
Toke Høiland-Jørgensen 2019-03-20 15:58:52 +01:00 • committed by Jouni Malinen
parent 6720b9482f
commit ef7217518b
12 changed files with 498 additions and 0 deletions
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26
src/ap/ap_config.c
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@ -19,6 +19,7 @@
#include "eap_server/eap.h"
#include "wpa_auth.h"
#include "sta_info.h"
#include "airtime_policy.h"
#include "ap_config.h"
@ -249,6 +250,10 @@ struct hostapd_config * hostapd_config_defaults(void)
conf->rssi_reject_assoc_rssi = 0;
conf->rssi_reject_assoc_timeout = 30;
#ifdef CONFIG_AIRTIME_POLICY
conf->airtime_update_interval = AIRTIME_DEFAULT_UPDATE_INTERVAL;
#endif /* CONFIG_AIRTIME_POLICY */
return conf;
}
@ -766,6 +771,20 @@ void hostapd_config_free_bss(struct hostapd_bss_config *conf)
hostapd_config_free_sae_passwords(conf);
#ifdef CONFIG_AIRTIME_POLICY
{
struct airtime_sta_weight *wt, *wt_prev;
wt = conf->airtime_weight_list;
conf->airtime_weight_list = NULL;
while (wt) {
wt_prev = wt;
wt = wt->next;
os_free(wt_prev);
}
}
#endif /* CONFIG_AIRTIME_POLICY */
os_free(conf);
}
@ -1162,6 +1181,13 @@ int hostapd_config_check(struct hostapd_config *conf, int full_config)
return -1;
}
#ifdef CONFIG_AIRTIME_POLICY
if (full_config && conf->airtime_mode > AIRTIME_MODE_STATIC &&
!conf->airtime_update_interval) {
wpa_printf(MSG_ERROR, "Airtime update interval cannot be zero");
return -1;
}
#endif /* CONFIG_AIRTIME_POLICY */
for (i = 0; i < NUM_TX_QUEUES; i++) {
if (hostapd_config_check_cw(conf, i))
return -1;