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dpp: refactor calls to offchannel_start into common function

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This will aid in channel switching during authentication by allowing
an arbitrary channel to be passed in rather than dpp->current_freq.
This commit is contained in:
James Prestwood 2022-01-07 16:13:31 -08:00 committed by Denis Kenzior
parent 39020bf14d
commit 235042fcd5
1 changed files with 107 additions and 96 deletions
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203
src/dpp.c
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@ -1205,6 +1205,112 @@ static bool dpp_check_roles(struct dpp_sm *dpp, uint8_t peer_capa)
return true;
}
static void dpp_presence_announce(struct dpp_sm *dpp)
{
struct netdev *netdev = dpp->netdev;
uint8_t hdr[32];
uint8_t attrs[32 + 4];
uint8_t hash[32];
uint8_t *ptr = attrs;
const uint8_t *addr = netdev_get_address(netdev);
struct iovec iov[2];
iov[0].iov_len = dpp_build_header(addr, broadcast,
DPP_FRAME_PRESENCE_ANNOUNCEMENT, hdr);
iov[0].iov_base = hdr;
dpp_hash(L_CHECKSUM_SHA256, hash, 2, "chirp", strlen("chirp"),
dpp->pub_asn1, dpp->pub_asn1_len);
ptr += dpp_append_attr(ptr, DPP_ATTR_RESPONDER_BOOT_KEY_HASH, hash, 32);
iov[1].iov_base = attrs;
iov[1].iov_len = ptr - attrs;
l_debug("Sending presense annoucement on frequency %u and waiting %u",
dpp->current_freq, dpp->dwell);
dpp_send_frame(netdev_get_wdev_id(netdev), iov, 2, dpp->current_freq);
}
static void dpp_roc_started(void *user_data)
{
struct dpp_sm *dpp = user_data;
/*
* If not in presence procedure or in a configurator role, just stay
* on channel.
*/
if (dpp->state != DPP_STATE_PRESENCE ||
dpp->role == DPP_CAPABILITY_CONFIGURATOR)
return;
dpp_presence_announce(dpp);
}
static void dpp_start_offchannel(struct dpp_sm *dpp, uint32_t freq);
static void dpp_presence_timeout(int error, void *user_data)
{
struct dpp_sm *dpp = user_data;
dpp->offchannel_id = 0;
/*
* If cancelled this is likely due to netdev going down or from Stop().
* Otherwise there was some other problem which is probably not
* recoverable.
*/
if (error == -ECANCELED)
return;
else if (error == -EIO)
goto next_roc;
else if (error < 0)
goto protocol_failed;
switch (dpp->state) {
case DPP_STATE_PRESENCE:
break;
case DPP_STATE_NOTHING:
/* Protocol already terminated */
return;
case DPP_STATE_AUTHENTICATING:
case DPP_STATE_CONFIGURING:
goto next_roc;
}
dpp->freqs_idx++;
if (dpp->freqs_idx >= dpp->freqs_len) {
l_debug("Max retries on presence announcements");
dpp->freqs_idx = 0;
}
dpp->current_freq = dpp->freqs[dpp->freqs_idx];
l_debug("Presence timeout, moving to next frequency %u, duration %u",
dpp->current_freq, dpp->dwell);
next_roc:
dpp_start_offchannel(dpp, dpp->current_freq);
return;
protocol_failed:
dpp_reset(dpp);
return;
}
static void dpp_start_offchannel(struct dpp_sm *dpp, uint32_t freq)
{
if (dpp->offchannel_id)
offchannel_cancel(dpp->wdev_id, dpp->offchannel_id);
dpp->offchannel_id = offchannel_start(netdev_get_wdev_id(dpp->netdev),
freq, dpp->dwell, dpp_roc_started,
dpp, dpp_presence_timeout);
}
static void authenticate_request(struct dpp_sm *dpp, const uint8_t *from,
const uint8_t *body, size_t body_len)
{
@ -1415,49 +1521,6 @@ static void dpp_handle_frame(const struct mmpdu_header *frame,
}
}
static void dpp_presence_announce(struct dpp_sm *dpp)
{
struct netdev *netdev = dpp->netdev;
uint8_t hdr[32];
uint8_t attrs[32 + 4];
uint8_t hash[32];
uint8_t *ptr = attrs;
const uint8_t *addr = netdev_get_address(netdev);
struct iovec iov[2];
iov[0].iov_len = dpp_build_header(addr, broadcast,
DPP_FRAME_PRESENCE_ANNOUNCEMENT, hdr);
iov[0].iov_base = hdr;
dpp_hash(L_CHECKSUM_SHA256, hash, 2, "chirp", strlen("chirp"),
dpp->pub_asn1, dpp->pub_asn1_len);
ptr += dpp_append_attr(ptr, DPP_ATTR_RESPONDER_BOOT_KEY_HASH, hash, 32);
iov[1].iov_base = attrs;
iov[1].iov_len = ptr - attrs;
l_debug("Sending presense annoucement on frequency %u and waiting %u",
dpp->current_freq, dpp->dwell);
dpp_send_frame(netdev_get_wdev_id(netdev), iov, 2, dpp->current_freq);
}
static void dpp_roc_started(void *user_data)
{
struct dpp_sm *dpp = user_data;
/*
* If not in presence procedure or in a configurator role, just stay
* on channel.
*/
if (dpp->state != DPP_STATE_PRESENCE ||
dpp->role == DPP_CAPABILITY_CONFIGURATOR)
return;
dpp_presence_announce(dpp);
}
static void dpp_create(struct netdev *netdev)
{
struct l_dbus *dbus = dbus_get_bus();
@ -1518,56 +1581,6 @@ static void dpp_netdev_watch(struct netdev *netdev,
}
}
static void dpp_presence_timeout(int error, void *user_data)
{
struct dpp_sm *dpp = user_data;
/*
* If cancelled this is likely due to netdev going down or from Stop().
* Otherwise there was some other problem which is probably not
* recoverable.
*/
if (error == -ECANCELED)
return;
else if (error == -EIO)
goto next_roc;
else if (error < 0)
goto protocol_failed;
switch (dpp->state) {
case DPP_STATE_PRESENCE:
break;
case DPP_STATE_NOTHING:
/* Protocol already terminated */
return;
case DPP_STATE_AUTHENTICATING:
case DPP_STATE_CONFIGURING:
goto next_roc;
}
dpp->freqs_idx++;
if (dpp->freqs_idx >= dpp->freqs_len) {
l_debug("Max retries on presence announcements");
dpp->freqs_idx = 0;
}
dpp->current_freq = dpp->freqs[dpp->freqs_idx];
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);
return;
protocol_failed:
dpp_reset(dpp);
return;
}
/*
* EasyConnect 2.0 - 6.2.2
*/
@ -1627,9 +1640,7 @@ static void dpp_start_presence(struct dpp_sm *dpp, uint32_t *limit_freqs,
dpp->freqs_idx = 0;
dpp->current_freq = dpp->freqs[0];
dpp->offchannel_id = offchannel_start(netdev_get_wdev_id(dpp->netdev),
dpp->current_freq, dpp->dwell, dpp_roc_started,
dpp, dpp_presence_timeout);
dpp_start_offchannel(dpp, dpp->current_freq);
}
static struct l_dbus_message *dpp_dbus_start_enrollee(struct l_dbus *dbus,