--- /dev/null
+/*
+ * Wi-Fi Direct - P2P Device Discoverability procedure
+ * Copyright (c) 2010, Atheros Communications
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "common/ieee802_11_defs.h"
+#include "p2p_i.h"
+#include "p2p.h"
+
+
+static struct wpabuf * p2p_build_dev_disc_req(struct p2p_data *p2p,
+ struct p2p_device *go,
+ const u8 *dev_id)
+{
+ struct wpabuf *buf;
+ u8 *len;
+
+ buf = wpabuf_alloc(100);
+ if (buf == NULL)
+ return NULL;
+
+ go->dialog_token++;
+ if (go->dialog_token == 0)
+ go->dialog_token = 1;
+ p2p_buf_add_public_action_hdr(buf, P2P_DEV_DISC_REQ, go->dialog_token);
+
+ len = p2p_buf_add_ie_hdr(buf);
+ p2p_buf_add_device_id(buf, dev_id);
+ p2p_buf_add_group_id(buf, go->info.p2p_device_addr, go->oper_ssid,
+ go->oper_ssid_len);
+ p2p_buf_update_ie_hdr(buf, len);
+
+ return buf;
+}
+
+
+void p2p_dev_disc_req_cb(struct p2p_data *p2p, int success)
+{
+ p2p_dbg(p2p, "Device Discoverability Request TX callback: success=%d",
+ success);
+
+ if (!success) {
+ /*
+ * Use P2P find, if needed, to find the other device or to
+ * retry device discoverability.
+ */
+ p2p_set_state(p2p, P2P_CONNECT);
+ p2p_set_timeout(p2p, 0, 100000);
+ return;
+ }
+
+ p2p_dbg(p2p, "GO acknowledged Device Discoverability Request - wait for response");
+ /*
+ * TODO: is the remain-on-channel from Action frame TX long enough for
+ * most cases or should we try to increase its duration and/or start
+ * another remain-on-channel if needed once the previous one expires?
+ */
+}
+
+
+int p2p_send_dev_disc_req(struct p2p_data *p2p, struct p2p_device *dev)
+{
+ struct p2p_device *go;
+ struct wpabuf *req;
+ unsigned int wait_time;
+
+ go = p2p_get_device(p2p, dev->member_in_go_dev);
+ if (go == NULL || dev->oper_freq <= 0) {
+ p2p_dbg(p2p, "Could not find peer entry for GO and frequency to send Device Discoverability Request");
+ return -1;
+ }
+
+ req = p2p_build_dev_disc_req(p2p, go, dev->info.p2p_device_addr);
+ if (req == NULL)
+ return -1;
+
+ p2p_dbg(p2p, "Sending Device Discoverability Request to GO " MACSTR
+ " for client " MACSTR,
+ MAC2STR(go->info.p2p_device_addr),
+ MAC2STR(dev->info.p2p_device_addr));
+
+ p2p->pending_client_disc_go = go;
+ os_memcpy(p2p->pending_client_disc_addr, dev->info.p2p_device_addr,
+ ETH_ALEN);
+ p2p->pending_action_state = P2P_PENDING_DEV_DISC_REQUEST;
+ wait_time = 1000;
+ if (p2p->cfg->max_listen && wait_time > p2p->cfg->max_listen)
+ wait_time = p2p->cfg->max_listen;
+ if (p2p_send_action(p2p, dev->oper_freq, go->info.p2p_device_addr,
+ p2p->cfg->dev_addr, go->info.p2p_device_addr,
+ wpabuf_head(req), wpabuf_len(req), wait_time) < 0) {
+ p2p_dbg(p2p, "Failed to send Action frame");
+ wpabuf_free(req);
+ /* TODO: how to recover from failure? */
+ return -1;
+ }
+
+ wpabuf_free(req);
+
+ return 0;
+}
+
+
+static struct wpabuf * p2p_build_dev_disc_resp(u8 dialog_token, u8 status)
+{
+ struct wpabuf *buf;
+ u8 *len;
+
+ buf = wpabuf_alloc(100);
+ if (buf == NULL)
+ return NULL;
+
+ p2p_buf_add_public_action_hdr(buf, P2P_DEV_DISC_RESP, dialog_token);
+
+ len = p2p_buf_add_ie_hdr(buf);
+ p2p_buf_add_status(buf, status);
+ p2p_buf_update_ie_hdr(buf, len);
+
+ return buf;
+}
+
+
+void p2p_dev_disc_resp_cb(struct p2p_data *p2p, int success)
+{
+ p2p_dbg(p2p, "Device Discoverability Response TX callback: success=%d",
+ success);
+ p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
+}
+
+
+static void p2p_send_dev_disc_resp(struct p2p_data *p2p, u8 dialog_token,
+ const u8 *addr, int freq, u8 status)
+{
+ struct wpabuf *resp;
+
+ resp = p2p_build_dev_disc_resp(dialog_token, status);
+ if (resp == NULL)
+ return;
+
+ p2p_dbg(p2p, "Sending Device Discoverability Response to " MACSTR
+ " (status %u freq %d)",
+ MAC2STR(addr), status, freq);
+
+ p2p->pending_action_state = P2P_PENDING_DEV_DISC_RESPONSE;
+ if (p2p_send_action(p2p, freq, addr, p2p->cfg->dev_addr,
+ p2p->cfg->dev_addr,
+ wpabuf_head(resp), wpabuf_len(resp), 200) < 0) {
+ p2p_dbg(p2p, "Failed to send Action frame");
+ }
+
+ wpabuf_free(resp);
+}
+
+
+void p2p_process_dev_disc_req(struct p2p_data *p2p, const u8 *sa,
+ const u8 *data, size_t len, int rx_freq)
+{
+ struct p2p_message msg;
+ size_t g;
+
+ p2p_dbg(p2p, "Received Device Discoverability Request from " MACSTR
+ " (freq=%d)", MAC2STR(sa), rx_freq);
+
+ if (p2p_parse(data, len, &msg))
+ return;
+
+ if (msg.dialog_token == 0) {
+ p2p_dbg(p2p, "Invalid Dialog Token 0 (must be nonzero) in Device Discoverability Request");
+ p2p_send_dev_disc_resp(p2p, msg.dialog_token, sa, rx_freq,
+ P2P_SC_FAIL_INVALID_PARAMS);
+ p2p_parse_free(&msg);
+ return;
+ }
+
+ if (msg.device_id == NULL) {
+ p2p_dbg(p2p, "P2P Device ID attribute missing from Device Discoverability Request");
+ p2p_send_dev_disc_resp(p2p, msg.dialog_token, sa, rx_freq,
+ P2P_SC_FAIL_INVALID_PARAMS);
+ p2p_parse_free(&msg);
+ return;
+ }
+
+ for (g = 0; g < p2p->num_groups; g++) {
+ if (p2p_group_go_discover(p2p->groups[g], msg.device_id, sa,
+ rx_freq) == 0) {
+ p2p_dbg(p2p, "Scheduled GO Discoverability Request for the target device");
+ /*
+ * P2P group code will use a callback to indicate TX
+ * status, so that we can reply to the request once the
+ * target client has acknowledged the request or it has
+ * timed out.
+ */
+ p2p->pending_dev_disc_dialog_token = msg.dialog_token;
+ os_memcpy(p2p->pending_dev_disc_addr, sa, ETH_ALEN);
+ p2p->pending_dev_disc_freq = rx_freq;
+ p2p_parse_free(&msg);
+ return;
+ }
+ }
+
+ p2p_dbg(p2p, "Requested client was not found in any group or did not support client discoverability");
+ p2p_send_dev_disc_resp(p2p, msg.dialog_token, sa, rx_freq,
+ P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE);
+ p2p_parse_free(&msg);
+}
+
+
+void p2p_process_dev_disc_resp(struct p2p_data *p2p, const u8 *sa,
+ const u8 *data, size_t len)
+{
+ struct p2p_message msg;
+ struct p2p_device *go;
+ u8 status;
+
+ p2p_dbg(p2p, "Received Device Discoverability Response from " MACSTR,
+ MAC2STR(sa));
+
+ go = p2p->pending_client_disc_go;
+ if (go == NULL ||
+ os_memcmp(sa, go->info.p2p_device_addr, ETH_ALEN) != 0) {
+ p2p_dbg(p2p, "Ignore unexpected Device Discoverability Response");
+ return;
+ }
+
+ if (p2p_parse(data, len, &msg))
+ return;
+
+ if (msg.status == NULL) {
+ p2p_parse_free(&msg);
+ return;
+ }
+
+ if (msg.dialog_token != go->dialog_token) {
+ p2p_dbg(p2p, "Ignore Device Discoverability Response with unexpected dialog token %u (expected %u)",
+ msg.dialog_token, go->dialog_token);
+ p2p_parse_free(&msg);
+ return;
+ }
+
+ status = *msg.status;
+ p2p_parse_free(&msg);
+
+ p2p_dbg(p2p, "Device Discoverability Response status %u", status);
+
+ if (p2p->go_neg_peer == NULL ||
+ os_memcmp(p2p->pending_client_disc_addr,
+ p2p->go_neg_peer->info.p2p_device_addr, ETH_ALEN) != 0 ||
+ os_memcmp(p2p->go_neg_peer->member_in_go_dev,
+ go->info.p2p_device_addr, ETH_ALEN) != 0) {
+ p2p_dbg(p2p, "No pending operation with the client discoverability peer anymore");
+ return;
+ }
+
+ if (status == 0) {
+ /*
+ * Peer is expected to be awake for at least 100 TU; try to
+ * connect immediately.
+ */
+ p2p_dbg(p2p, "Client discoverability request succeeded");
+ if (p2p->state == P2P_CONNECT) {
+ /*
+ * Change state to force the timeout to start in
+ * P2P_CONNECT again without going through the short
+ * Listen state.
+ */
+ p2p_set_state(p2p, P2P_CONNECT_LISTEN);
+ p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
+ }
+ p2p_set_timeout(p2p, 0, 0);
+ } else {
+ /*
+ * Client discoverability request failed; try to connect from
+ * timeout.
+ */
+ p2p_dbg(p2p, "Client discoverability request failed");
+ p2p_set_timeout(p2p, 0, 500000);
+ }
+
+}
+
+
+void p2p_go_disc_req_cb(struct p2p_data *p2p, int success)
+{
+ p2p_dbg(p2p, "GO Discoverability Request TX callback: success=%d",
+ success);
+ p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
+
+ if (p2p->pending_dev_disc_dialog_token == 0) {
+ p2p_dbg(p2p, "No pending Device Discoverability Request");
+ return;
+ }
+
+ p2p_send_dev_disc_resp(p2p, p2p->pending_dev_disc_dialog_token,
+ p2p->pending_dev_disc_addr,
+ p2p->pending_dev_disc_freq,
+ success ? P2P_SC_SUCCESS :
+ P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE);
+
+ p2p->pending_dev_disc_dialog_token = 0;
+}
+
+
+void p2p_process_go_disc_req(struct p2p_data *p2p, const u8 *da, const u8 *sa,
+ const u8 *data, size_t len, int rx_freq)
+{
+ unsigned int tu;
+ struct wpabuf *ies;
+
+ p2p_dbg(p2p, "Received GO Discoverability Request - remain awake for 100 TU");
+
+ ies = p2p_build_probe_resp_ies(p2p, NULL, 0);
+ if (ies == NULL)
+ return;
+
+ /* Remain awake 100 TU on operating channel */
+ p2p->pending_client_disc_freq = rx_freq;
+ tu = 100;
+ if (p2p->cfg->start_listen(p2p->cfg->cb_ctx, rx_freq, 1024 * tu / 1000,
+ ies) < 0) {
+ p2p_dbg(p2p, "Failed to start listen mode for client discoverability");
+ }
+ wpabuf_free(ies);
+}
projects / mech_eap.git / blobdiff