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P2P: Add retry mechanism for GO Negotiation Confirmation

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wpa_supplicant now retries for P2P_GO_NEG_CNF_MAX_RETRY_COUNT times if
it doesn't receive acknowledgement for GO Negotiation Confirmation
frame. Currently, P2P_GO_NEG_CNF_MAX_RETRY_COUNT is set to 1.

While this is not strictly speaking following the P2P specification,
this can improve robustness of GO Negotiation in environments with
interference and also with peer devices that do not behave properly
(e.g., by not remaining awake on the negotiation channel through the
full GO Negotiation).

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Nirav Shah 2014-04-08 03:42:19 +05:30 • committed by Jouni Malinen
parent 8235f89f3f
commit 0e0e1e564f
3 changed files with 71 additions and 9 deletions
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41
src/p2p/p2p.c
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@ -218,6 +218,8 @@ void p2p_go_neg_failed(struct p2p_data *p2p, struct p2p_device *peer,
os_memset(&res, 0, sizeof(res));
res.status = status;
if (peer) {
wpabuf_free(peer->go_neg_conf);
peer->go_neg_conf = NULL;
os_memcpy(res.peer_device_addr, peer->info.p2p_device_addr,
ETH_ALEN);
os_memcpy(res.peer_interface_addr, peer->intended_addr,
@ -802,6 +804,7 @@ static void p2p_device_free(struct p2p_data *p2p, struct p2p_device *dev)
}
wpabuf_free(dev->info.wfd_subelems);
wpabuf_free(dev->go_neg_conf);
os_free(dev);
}
@ -1611,6 +1614,8 @@ void p2p_go_complete(struct p2p_data *p2p, struct p2p_device *peer)
peer->go_neg_req_sent = 0;
peer->wps_method = WPS_NOT_READY;
peer->oob_pw_id = 0;
wpabuf_free(peer->go_neg_conf);
peer->go_neg_conf = NULL;
p2p_set_state(p2p, P2P_PROVISIONING);
p2p->cfg->go_neg_completed(p2p->cfg->cb_ctx, &res);
@ -2952,12 +2957,43 @@ static void p2p_go_neg_conf_cb(struct p2p_data *p2p,
struct p2p_device *dev;
p2p_dbg(p2p, "GO Negotiation Confirm TX callback: result=%d", result);
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
if (result == P2P_SEND_ACTION_FAILED) {
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
p2p_go_neg_failed(p2p, p2p->go_neg_peer, -1);
return;
}
dev = p2p->go_neg_peer;
if (result == P2P_SEND_ACTION_NO_ACK) {
/*
* Retry GO Negotiation Confirmation
* P2P_GO_NEG_CNF_MAX_RETRY_COUNT times if we did not receive
* ACK for confirmation.
*/
if (dev && dev->go_neg_conf &&
dev->go_neg_conf_sent <= P2P_GO_NEG_CNF_MAX_RETRY_COUNT) {
p2p_dbg(p2p, "GO Negotiation Confirm retry %d",
dev->go_neg_conf_sent);
p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM;
if (p2p_send_action(p2p, dev->go_neg_conf_freq,
dev->info.p2p_device_addr,
p2p->cfg->dev_addr,
dev->info.p2p_device_addr,
wpabuf_head(dev->go_neg_conf),
wpabuf_len(dev->go_neg_conf), 0) >=
0) {
dev->go_neg_conf_sent++;
return;
}
p2p_dbg(p2p, "Failed to re-send Action frame");
/*
* Continue with the assumption that the first attempt
* went through and just the ACK frame was lost.
*/
}
/*
* It looks like the TX status for GO Negotiation Confirm is
* often showing failure even when the peer has actually
@ -2971,7 +3007,8 @@ static void p2p_go_neg_conf_cb(struct p2p_data *p2p,
p2p_dbg(p2p, "Assume GO Negotiation Confirm TX was actually received by the peer even though Ack was not reported");
}
dev = p2p->go_neg_peer;
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
if (dev == NULL)
return;