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dpp: add station watch to DPP

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DPP (both DPP and PKEX) run the risk of odd behavior if station
decides to change state. DPP is completely unaware of this and
best case would just result in a protocol failure, worst case
duplicate calls to __station_connect_network.

Add a station watch and stop DPP if station changes state during
the protocol.
This commit is contained in:
James Prestwood 2023-11-13 09:53:59 -08:00 committed by Denis Kenzior
parent 485f9f56bf
commit e2f28312e2
1 changed files with 75 additions and 0 deletions
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75
src/dpp.c
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@ -100,6 +100,7 @@ struct dpp_sm {
char *uri;
uint8_t role;
int refcount;
uint32_t station_watch;
uint64_t wdev_id;
@ -536,6 +537,8 @@ static void dpp_reset(struct dpp_sm *dpp)
static void dpp_free(struct dpp_sm *dpp)
{
struct station *station = station_find(netdev_get_ifindex(dpp->netdev));
dpp_reset(dpp);
if (dpp->own_asn1) {
@ -553,6 +556,13 @@ static void dpp_free(struct dpp_sm *dpp)
dpp->boot_private = NULL;
}
/*
* Since this is called when the netdev goes down, station may already
* be gone in which case the state watch will automatically go away.
*/
if (station)
station_remove_state_watch(station, dpp->station_watch);
l_free(dpp);
}
@ -3608,6 +3618,67 @@ static void dpp_frame_watch(struct dpp_sm *dpp, uint16_t frame_type,
L_UINT_TO_PTR(frame_type), NULL);
}
/*
* Station is unaware of DPP's state so we need to handle a few cases here so
* weird stuff doesn't happen:
*
* - While configuring we should stay connected, a disconnection/roam should
* stop DPP since it would fail regardless due to the hardware going idle
* or changing channels since configurators assume all comms will be
* on-channel.
* - While enrolling we should stay disconnected. If station connects during
* enrolling it would cause 2x calls to __station_connect_network after
* DPP finishes.
*
* Other conditions shouldn't ever happen i.e. configuring and going into a
* connecting state or enrolling and going to a disconnected/roaming state.
*/
static void dpp_station_state_watch(enum station_state state, void *user_data)
{
struct dpp_sm *dpp = user_data;
switch (state) {
case STATION_STATE_DISCONNECTED:
case STATION_STATE_DISCONNECTING:
case STATION_STATE_ROAMING:
case STATION_STATE_FT_ROAMING:
case STATION_STATE_FW_ROAMING:
if (L_WARN_ON(dpp->role == DPP_CAPABILITY_ENROLLEE))
dpp_reset(dpp);
if (dpp->role == DPP_CAPABILITY_CONFIGURATOR) {
l_debug("Disconnected while configuring, stopping DPP");
dpp_reset(dpp);
}
break;
case STATION_STATE_CONNECTING:
case STATION_STATE_CONNECTED:
case STATION_STATE_CONNECTING_AUTO:
if (L_WARN_ON(dpp->role == DPP_CAPABILITY_CONFIGURATOR))
dpp_reset(dpp);
if (dpp->role == DPP_CAPABILITY_ENROLLEE) {
l_debug("Connecting while enrolling, stopping DPP");
dpp_reset(dpp);
}
break;
/*
* Autoconnect states are fine for enrollees. This makes it nicer for
* the user since they don't need to explicity Disconnect() to disable
* autoconnect, then re-enable it if DPP fails.
*/
case STATION_STATE_AUTOCONNECT_FULL:
case STATION_STATE_AUTOCONNECT_QUICK:
if (L_WARN_ON(dpp->role == DPP_CAPABILITY_CONFIGURATOR))
dpp_reset(dpp);
break;
}
}
static void dpp_create(struct netdev *netdev)
{
struct l_dbus *dbus = dbus_get_bus();
@ -3615,6 +3686,7 @@ static void dpp_create(struct netdev *netdev)
uint8_t dpp_conf_response_prefix[] = { 0x04, 0x0b };
uint8_t dpp_conf_request_prefix[] = { 0x04, 0x0a };
uint64_t wdev_id = netdev_get_wdev_id(netdev);
struct station *station = station_find(netdev_get_ifindex(netdev));
dpp->netdev = netdev;
dpp->state = DPP_STATE_NOTHING;
@ -3660,6 +3732,9 @@ static void dpp_create(struct netdev *netdev)
sizeof(dpp_conf_request_prefix),
dpp_handle_config_request_frame, dpp, NULL);
dpp->station_watch = station_add_state_watch(station,
dpp_station_state_watch, dpp, NULL);
l_queue_push_tail(dpp_list, dpp);
}