+++ /dev/null
-/*
- * Wi-Fi Direct - P2P Device Discoverability procedure
- * Copyright (c) 2010, Atheros Communications
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING 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->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)
-{
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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;
- }
-
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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;
-
- go = p2p_get_device(p2p, dev->member_in_go_dev);
- if (go == NULL || dev->oper_freq <= 0) {
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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->p2p_device_addr);
- if (req == NULL)
- return -1;
-
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "P2P: Sending Device Discoverability Request to GO " MACSTR
- " for client " MACSTR,
- MAC2STR(go->p2p_device_addr), MAC2STR(dev->p2p_device_addr));
-
- p2p->pending_client_disc_go = go;
- os_memcpy(p2p->pending_client_disc_addr, dev->p2p_device_addr,
- ETH_ALEN);
- p2p->pending_action_state = P2P_PENDING_DEV_DISC_REQUEST;
- if (p2p->cfg->send_action(p2p->cfg->cb_ctx, dev->oper_freq,
- go->p2p_device_addr, p2p->cfg->dev_addr,
- go->p2p_device_addr,
- wpabuf_head(req), wpabuf_len(req), 1000) < 0)
- {
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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)
-{
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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;
-
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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->cfg->send_action(p2p->cfg->cb_ctx, freq, addr,
- p2p->cfg->dev_addr, p2p->cfg->dev_addr,
- wpabuf_head(resp), wpabuf_len(resp), 200) <
- 0) {
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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;
-
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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) {
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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) {
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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) {
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "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;
- }
- }
-
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "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;
-
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "P2P: Received Device Discoverability Response from " MACSTR,
- MAC2STR(sa));
-
- go = p2p->pending_client_disc_go;
- if (go == NULL || os_memcmp(sa, go->p2p_device_addr, ETH_ALEN) != 0) {
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "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) {
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "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);
-
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "P2P: Device Discoverability Response status %u", status);
-
- if (p2p->go_neg_peer == NULL ||
- os_memcmp(p2p->pending_client_disc_addr,
- p2p->go_neg_peer->p2p_device_addr, ETH_ALEN) != 0 ||
- os_memcmp(p2p->go_neg_peer->member_in_go_dev, go->p2p_device_addr,
- ETH_ALEN) != 0) {
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "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.
- */
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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.
- */
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "P2P: Client discoverability request failed");
- p2p_set_timeout(p2p, 0, 500000);
- }
-
-}
-
-
-void p2p_go_disc_req_cb(struct p2p_data *p2p, int success)
-{
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "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) {
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "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;
-
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "P2P: Received GO Discoverability Request - remain awake for "
- "100 TU");
-
- ies = p2p_build_probe_resp_ies(p2p);
- 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) {
- wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
- "P2P: Failed to start listen mode for client "
- "discoverability");
- }
- wpabuf_free(ies);
-}
projects / mech_eap.git / blobdiff