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station: send FT-over-DS actions upon connection

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Roam times can be slightly improved by sending out the FT-over-DS
action frames to any BSS in the mobility domain immediately after
connecting. This preauthenticates IWD to each AP which means
Reassociation can happen right away when a roam is needed.

When a roam is needed station_transition_start will first try
FT-over-DS (if supported) via netdev_fast_transtion_over_ds. The
return is checked and if netdev has no cached entries FT-over-Air
will be used instead.
This commit is contained in:
James Prestwood 2021-05-12 16:01:43 -07:00 committed by Denis Kenzior
parent 78fe1cc0ef
commit 7385e2c90e
1 changed files with 60 additions and 49 deletions
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109
src/station.c
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@ -1720,45 +1720,6 @@ static bool bss_match_bssid(const void *a, const void *b)
return !memcmp(bss->addr, bssid, sizeof(bss->addr));
}
static void station_fast_transition_ds_cb(struct netdev *netdev,
uint16_t status, const uint8_t *bssid,
void *user_data)
{
struct station *station = user_data;
struct scan_bss *bss;
if (status != 0)
goto failed;
/*
* TODO: In the future it may be desired to start sending out these
* FT-over-DS action frames at the time of connecting then be able to
* roam immediately when required. If this is being done we can simply
* bail out now as ft already caches the entires. But since this was
* initiated due to a need to roam, do so now.
*/
/* Make sure we still have our BSS */
bss = l_queue_find(station->bss_list, bss_match_bssid, bssid);
if (!bss)
goto failed;
l_debug("Starting FT-over-DS roam");
if (netdev_fast_transition_over_ds(station->netdev, bss,
station_fast_transition_cb) < 0)
goto failed;
station->connected_bss = bss;
station->preparing_roam = false;
station_enter_state(station, STATION_STATE_ROAMING);
return;
failed:
station_roam_retry(station);
}
static void station_preauthenticate_cb(struct netdev *netdev,
enum netdev_result result,
const uint8_t *pmk, void *user_data)
@ -1849,6 +1810,7 @@ static void station_transition_start(struct station *station,
enum security security = network_get_security(connected);
struct handshake_state *new_hs;
struct ie_rsn_info cur_rsne, target_rsne;
int ret;
l_debug("%u, target %s", netdev_get_ifindex(station->netdev),
util_address_to_string(bss->addr));
@ -1868,19 +1830,21 @@ static void station_transition_start(struct station *station,
/* FT-over-DS can be better suited for these situations */
if ((hs->mde[4] & 1) && station->signal_low) {
if (netdev_fast_transition_over_ds_action(
station->netdev, bss,
station_fast_transition_ds_cb,
station) < 0) {
ret = netdev_fast_transition_over_ds(station->netdev,
bss, station_fast_transition_cb);
/* No action responses from this BSS, try over air */
if (ret == -ENOENT)
goto try_over_air;
else if (ret < 0) {
/*
* If we are here FT-over-air will not work
* either (identical checks) so try again later.
*/
station_roam_retry(station);
return;
}
/*
* Set connected_bss/preparing_roam/state only on a
* successful FT-over-DS action frame response
*/
return;
} else {
try_over_air:
if (netdev_fast_transition(station->netdev, bss,
station_fast_transition_cb) < 0) {
station_roam_failed(station);
@ -2512,10 +2476,42 @@ static void station_connect_dbus_reply(struct station *station,
dbus_pending_reply(&station->connect_pending, reply);
}
static void station_ft_ds_action_start(struct station *station, uint16_t mdid)
{
const struct l_queue_entry *entry;
struct scan_bss *bss;
struct ie_rsn_info rsn_info;
for (entry = network_bss_list_get_entries(station->connected_network);
entry; entry = entry->next) {
bss = entry->data;
if (bss == station->connected_bss)
continue;
if (mdid != l_get_le16(bss->mde))
continue;
if (scan_bss_get_rsn_info(bss, &rsn_info) < 0)
continue;
if (!IE_AKM_IS_FT(rsn_info.akm_suites))
continue;
/*
* Fire and forget. Netdev will maintain a cache of responses and
* when the time comes these can be referenced for a roam
*/
netdev_fast_transition_over_ds_action(station->netdev, bss,
NULL, NULL);
}
}
static void station_connect_cb(struct netdev *netdev, enum netdev_result result,
void *event_data, void *user_data)
{
struct station *station = user_data;
struct handshake_state *hs = netdev_get_handshake(netdev);
l_debug("%u, result: %d", netdev_get_ifindex(station->netdev), result);
@ -2566,6 +2562,21 @@ static void station_connect_cb(struct netdev *netdev, enum netdev_result result,
l_warn("Could not request neighbor report");
}
/*
* If this network supports FT-over-DS send initial action frames now
* to prepare for future roams.
*/
if (station_can_fast_transition(hs, station->connected_bss) &&
(hs->mde[4] & 1)) {
uint16_t mdid;
if (ie_parse_mobility_domain_from_data(hs->mde, hs->mde[1] + 2,
&mdid, NULL, NULL) < 0)
return;
station_ft_ds_action_start(station, mdid);
}
network_connected(station->connected_network);
if (station->netconfig)