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netdev: Properly handle auth_proto error returns

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Kernel keeps transmitting authentication frames until told to stop or an
authentication frame the kernel considers 'final' is received.  Detect
cases where the kernel would keep retransmitting, and if auth_proto
encounters a fatal protocol error, prevent these retransmissions from
occuring by sending a Deauthenticate command to the kernel.

Additionally, treat -EBADMSG/-ENOMSG return from auth_proto specially.
These error codes are meant to convey that a frame should be silently
dropped and retransmissions should continue.
This commit is contained in:
Denis Kenzior 2021-09-08 16:50:06 -05:00
parent eeb42c56f0
commit 23af586acd
1 changed files with 59 additions and 1 deletions
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60
src/netdev.c
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@ -2644,6 +2644,31 @@ static void netdev_cmd_ft_reassociate_cb(struct l_genl_msg *msg,
} }
} }
static bool kernel_will_retry_auth(uint16_t status_code,
uint16_t alg, uint16_t trans)
{
/*
* Kernel keeps re-trying auth frames until told to stop
* when authentication succeeds and under certain SAE-related
* circumstances. Detect these cases.
*/
if (status_code == 0)
return true;
if (alg != MMPDU_AUTH_ALGO_SAE)
return false;
if (status_code == MMPDU_STATUS_CODE_ANTI_CLOGGING_TOKEN_REQ)
return true;
if (trans == 1 && (status_code == MMPDU_STATUS_CODE_SAE_PK ||
status_code == MMPDU_STATUS_CODE_SAE_HASH_TO_ELEMENT))
return true;
return false;
}
static void netdev_authenticate_event(struct l_genl_msg *msg, static void netdev_authenticate_event(struct l_genl_msg *msg,
struct netdev *netdev) struct netdev *netdev)
{ {
@ -2707,6 +2732,7 @@ static void netdev_authenticate_event(struct l_genl_msg *msg,
if (netdev->ap) { if (netdev->ap) {
const struct mmpdu_header *hdr; const struct mmpdu_header *hdr;
const struct mmpdu_authentication *auth; const struct mmpdu_authentication *auth;
bool retry;
if (L_WARN_ON(!(hdr = mpdu_validate(frame, frame_len)))) if (L_WARN_ON(!(hdr = mpdu_validate(frame, frame_len))))
goto auth_error; goto auth_error;
@ -2715,10 +2741,42 @@ static void netdev_authenticate_event(struct l_genl_msg *msg,
status_code = L_CPU_TO_LE16(auth->status); status_code = L_CPU_TO_LE16(auth->status);
ret = auth_proto_rx_authenticate(netdev->ap, frame, frame_len); ret = auth_proto_rx_authenticate(netdev->ap, frame, frame_len);
/* We have sent another CMD_AUTHENTICATE / CMD_ASSOCIATE */
if (ret == 0 || ret == -EAGAIN) if (ret == 0 || ret == -EAGAIN)
return; return;
else if (ret > 0)
retry = kernel_will_retry_auth(status_code,
L_CPU_TO_LE16(auth->algorithm),
L_CPU_TO_LE16(auth->transaction_sequence));
/*
* Spec wants us to silently drop these frames,
* if the kernel will keep retrying, let it
*/
if ((ret == -ENOMSG || ret == -EBADMSG) && retry)
return;
if (ret > 0)
status_code = (uint16_t)ret; status_code = (uint16_t)ret;
/*
* We have encountered a fatal error, if the kernel wants
* 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 = netdev_build_cmd_deauthenticate(netdev,
MMPDU_REASON_CODE_UNSPECIFIED);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211,
cmd_deauth,
netdev_disconnect_cb,
netdev, NULL);
return;
}
} }
auth_error: auth_error: