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netdev: disambiguate between disconnection types

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There are generally three scenarios where iwd generates a disconnection
command to the kernel:
  1. Error conditions stemming from a connection related event.  For
     example if SAE/FT/FILS authentication fails during Authenticate or
     Associate steps and the kernel doesn't disconnect properly.
  2. Deauthentication after the connection has been established and not
     related to a connection attempt in progress.  For example, SA Query
     processing that triggers an disconnect.
  3. Disconnects that are triggered due to a handshake failure or if
     setting keys resulting from the handshake fails.  These disconnects
     can be triggered as a result of a pending connection or when a
     connection has been established (e.g. due to rekeying).

Distinguish between 1 and 2/3 by having the disconnect procedure take
different paths.  For now there are no functional changes since all
paths end up in netdev_connect_failed(), but this will change in the
future.
This commit is contained in:
Denis Kenzior 2023-11-14 09:14:36 -06:00
parent 28798990d2
commit c59669a366
1 changed files with 76 additions and 50 deletions
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122
src/netdev.c
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@ -858,7 +858,7 @@ static void netdev_connect_failed(struct netdev *netdev,
}
}
static void netdev_disconnect_cb(struct l_genl_msg *msg, void *user_data)
static void netdev_connect_failed_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
@ -866,6 +866,63 @@ static void netdev_disconnect_cb(struct l_genl_msg *msg, void *user_data)
netdev_connect_failed(netdev, netdev->result, netdev->last_code);
}
static void netdev_send_and_fail_connection(struct netdev *netdev,
enum netdev_result result,
uint16_t status_code,
struct l_genl_msg *msg)
{
netdev->result = result;
netdev->last_code = status_code;
netdev->disconnect_cmd_id =
l_genl_family_send(nl80211, msg, netdev_connect_failed_cb,
netdev, NULL);
}
static void netdev_disconnect_and_fail_connection(struct netdev *netdev,
enum netdev_result result,
uint16_t status_code)
{
struct l_genl_msg *msg = nl80211_build_disconnect(netdev->index,
MMPDU_REASON_CODE_UNSPECIFIED);
netdev_send_and_fail_connection(netdev, result, status_code, msg);
}
static void netdev_deauth_and_fail_connection(struct netdev *netdev,
enum netdev_result result,
uint16_t status_code)
{
struct l_genl_msg *msg = nl80211_build_deauthenticate(netdev->index,
netdev->handshake->aa,
MMPDU_REASON_CODE_UNSPECIFIED);
netdev_send_and_fail_connection(netdev, result, status_code, msg);
}
static void netdev_disconnect_by_sme_cb(struct l_genl_msg *msg, void *user_data)
{
struct netdev *netdev = user_data;
netdev->disconnect_cmd_id = 0;
netdev_connect_failed(netdev, netdev->result, netdev->last_code);
}
static void netdev_disconnect_by_sme(struct netdev *netdev,
enum netdev_result result,
uint16_t reason_code)
{
struct l_genl_msg *msg = nl80211_build_disconnect(netdev->index,
reason_code);
netdev->result = result;
netdev->last_code = reason_code;
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, msg,
netdev_disconnect_by_sme_cb,
netdev, NULL);
}
static void netdev_free(void *data)
{
struct netdev *netdev = data;
@ -1388,11 +1445,9 @@ static void netdev_setting_keys_failed(struct netdev_handshake_state *nhs,
return;
}
msg = nl80211_build_disconnect(netdev->index,
netdev_disconnect_by_sme(netdev,
NETDEV_RESULT_KEY_SETTING_FAILED,
MMPDU_REASON_CODE_UNSPECIFIED);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, msg,
netdev_disconnect_cb,
netdev, NULL);
break;
case NL80211_IFTYPE_AP:
if (err == -ENETDOWN)
@ -1407,7 +1462,6 @@ static void netdev_setting_keys_failed(struct netdev_handshake_state *nhs,
break;
}
netdev->result = NETDEV_RESULT_KEY_SETTING_FAILED;
handshake_event(&nhs->super, HANDSHAKE_EVENT_SETTING_KEYS_FAILED, &err);
}
@ -2118,16 +2172,11 @@ void netdev_handshake_failed(struct handshake_state *hs, uint16_t reason_code)
netdev->sm = NULL;
netdev->result = NETDEV_RESULT_HANDSHAKE_FAILED;
netdev->last_code = reason_code;
switch (netdev->type) {
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
msg = nl80211_build_disconnect(netdev->index, reason_code);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, msg,
netdev_disconnect_cb,
netdev, NULL);
netdev_disconnect_by_sme(netdev, NETDEV_RESULT_HANDSHAKE_FAILED,
reason_code);
break;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
@ -2842,14 +2891,9 @@ error:
return;
deauth:
netdev->result = NETDEV_RESULT_ASSOCIATION_FAILED;
netdev->last_code = MMPDU_STATUS_CODE_UNSPECIFIED;
msg = nl80211_build_disconnect(netdev->index,
MMPDU_REASON_CODE_UNSPECIFIED);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211,
msg,
netdev_disconnect_cb,
netdev, NULL);
netdev_disconnect_and_fail_connection(netdev,
NETDEV_RESULT_ASSOCIATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
static struct l_genl_msg *netdev_build_cmd_associate_common(
@ -2890,19 +2934,12 @@ static void netdev_cmd_ft_reassociate_cb(struct l_genl_msg *msg,
netdev->connect_cmd_id = 0;
if (l_genl_msg_get_error(msg) < 0) {
struct l_genl_msg *cmd_deauth;
if (l_genl_msg_get_error(msg) >= 0)
return;
netdev->result = NETDEV_RESULT_ASSOCIATION_FAILED;
netdev->last_code = MMPDU_STATUS_CODE_UNSPECIFIED;
cmd_deauth = nl80211_build_deauthenticate(netdev->index,
netdev->handshake->aa,
MMPDU_REASON_CODE_UNSPECIFIED);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211,
cmd_deauth,
netdev_disconnect_cb,
netdev, NULL);
}
netdev_deauth_and_fail_connection(netdev,
NETDEV_RESULT_ASSOCIATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
}
static bool kernel_will_retry_auth(uint16_t status_code,
@ -3027,17 +3064,9 @@ static void netdev_authenticate_event(struct l_genl_msg *msg,
* to keep retrying, tell it to stop
*/
if (retry) {
struct l_genl_msg *cmd_deauth;
netdev->result = NETDEV_RESULT_ASSOCIATION_FAILED;
netdev->last_code = MMPDU_STATUS_CODE_UNSPECIFIED;
cmd_deauth = nl80211_build_deauthenticate(netdev->index,
netdev->handshake->aa,
MMPDU_REASON_CODE_UNSPECIFIED);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211,
cmd_deauth,
netdev_disconnect_cb,
netdev, NULL);
netdev_deauth_and_fail_connection(netdev,
NETDEV_RESULT_ASSOCIATION_FAILED,
MMPDU_STATUS_CODE_UNSPECIFIED);
return;
}
}
@ -4545,17 +4574,14 @@ static void netdev_sa_query_timeout(struct l_timeout *timeout,
void *user_data)
{
struct netdev *netdev = user_data;
struct l_genl_msg *msg;
l_info("SA Query timed out, connection is invalid. Disconnecting...");
l_timeout_remove(netdev->sa_query_timeout);
netdev->sa_query_timeout = NULL;
msg = nl80211_build_disconnect(netdev->index,
netdev_disconnect_by_sme(netdev, NETDEV_RESULT_ABORTED,
MMPDU_REASON_CODE_PREV_AUTH_NOT_VALID);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, msg,
netdev_disconnect_cb, netdev, NULL);
}
static void netdev_sa_query_req_cb(struct l_genl_msg *msg, void *user_data)