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dpp: add timeout for auth/config protocols

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This also allows the card to re-issue ROC if it ends in the middle of
authenticating or configuring as well as add a maximum timeout for
auth/config protocols.

IO errors were also handled as these sometimes can happen with
certain drivers but are not fatal.
This commit is contained in:
James Prestwood 2021-12-20 16:07:42 -08:00 committed by Denis Kenzior
parent 00fddaa868
commit 8f711078b8
1 changed files with 38 additions and 10 deletions
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48
src/dpp.c
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@ -98,6 +98,9 @@ struct dpp_sm {
struct l_ecc_point *i_proto_public;
uint8_t diag_token;
/* Timeout of either auth/config protocol */
struct l_timeout *timeout;
};
static void dpp_free_auth_data(struct dpp_sm *dpp)
@ -135,6 +138,11 @@ static void dpp_reset(struct dpp_sm *dpp)
dpp->offchannel_id = 0;
}
if (dpp->timeout) {
l_timeout_remove(dpp->timeout);
dpp->timeout = NULL;
}
dpp->state = DPP_STATE_NOTHING;
dpp_free_auth_data(dpp);
@ -239,6 +247,24 @@ static size_t dpp_build_config_header(const uint8_t *src, const uint8_t *dest,
return ptr - buf;
}
static void dpp_protocol_timeout(struct l_timeout *timeout, void *user_data)
{
struct dpp_sm *dpp = user_data;
l_debug("DPP timed out");
dpp_reset(dpp);
}
static void dpp_reset_protocol_timer(struct dpp_sm *dpp)
{
if (dpp->timeout)
l_timeout_modify(dpp->timeout, 10);
else
dpp->timeout = l_timeout_create(10, dpp_protocol_timeout,
dpp, NULL);
}
/*
* The configuration protocols use of AD components is somewhat confusing
* since the request/response frames are of a different format than the rest.
@ -733,6 +759,7 @@ static void authenticate_confirm(struct dpp_sm *dpp, const uint8_t *from,
l_debug("Authentication successful");
dpp_reset_protocol_timer(dpp);
dpp_configuration_start(dpp, from);
return;
@ -941,6 +968,7 @@ static void authenticate_request(struct dpp_sm *dpp, const uint8_t *from,
memcpy(dpp->auth_addr, from, 6);
dpp->state = DPP_STATE_AUTHENTICATING;
dpp_reset_protocol_timer(dpp);
send_authenticate_response(dpp, r_auth);
@ -1013,6 +1041,12 @@ static void dpp_roc_started(void *user_data)
{
struct dpp_sm *dpp = user_data;
/*
* If not in presence procedure, just stay on channel.
*/
if (dpp->state != DPP_STATE_PRESENCE)
return;
dpp_presence_announce(dpp);
}
@ -1082,6 +1116,8 @@ static void dpp_presence_timeout(int error, void *user_data)
*/
if (error == -ECANCELED)
return;
else if (error == -EIO)
goto next_roc;
else if (error < 0)
goto protocol_failed;
@ -1093,16 +1129,7 @@ static void dpp_presence_timeout(int error, void *user_data)
return;
case DPP_STATE_AUTHENTICATING:
case DPP_STATE_CONFIGURING:
/*
* TODO: If either the auth or config protocol is running we
* need to stay on channel until the specified timeouts.
* Unfortunately the kernel makes this very inconvenient since
* there is no way to stay on channel indefinitely or any way
* of knowing what duration the kernel/card actually chooses.
*
* For now just treat this as a failure.
*/
goto protocol_failed;
goto next_roc;
}
dpp->freqs_idx++;
@ -1117,6 +1144,7 @@ static void dpp_presence_timeout(int error, void *user_data)
l_debug("Presence timeout, moving to next frequency %u, duration %u",
dpp->current_freq, dpp->dwell);
next_roc:
dpp->offchannel_id = offchannel_start(netdev_get_wdev_id(dpp->netdev),
dpp->current_freq, dpp->dwell, dpp_roc_started,
dpp, dpp_presence_timeout);