1064 lines
29 KiB
C
1064 lines
29 KiB
C
/*
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* Wi-Fi Direct - P2P Group Owner Negotiation
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* Copyright (c) 2009-2010, Atheros Communications
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "common/ieee802_11_defs.h"
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#include "wps/wps_defs.h"
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#include "p2p_i.h"
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#include "p2p.h"
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static int p2p_go_det(u8 own_intent, u8 peer_value)
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{
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u8 peer_intent = peer_value >> 1;
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if (own_intent == peer_intent) {
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if (own_intent == P2P_MAX_GO_INTENT)
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return -1; /* both devices want to become GO */
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/* Use tie breaker bit to determine GO */
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return (peer_value & 0x01) ? 0 : 1;
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}
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return own_intent > peer_intent;
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}
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int p2p_peer_channels_check(struct p2p_data *p2p, struct p2p_channels *own,
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struct p2p_device *dev,
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const u8 *channel_list, size_t channel_list_len)
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{
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const u8 *pos, *end;
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struct p2p_channels *ch;
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size_t channels;
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struct p2p_channels intersection;
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ch = &dev->channels;
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os_memset(ch, 0, sizeof(*ch));
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pos = channel_list;
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end = channel_list + channel_list_len;
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if (end - pos < 3)
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return -1;
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os_memcpy(dev->country, pos, 3);
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wpa_hexdump_ascii(MSG_DEBUG, "P2P: Peer country", pos, 3);
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if (pos[2] != 0x04 && os_memcmp(pos, p2p->cfg->country, 2) != 0) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_INFO,
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"P2P: Mismatching country (ours=%c%c peer's=%c%c)",
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p2p->cfg->country[0], p2p->cfg->country[1],
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pos[0], pos[1]);
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return -1;
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}
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pos += 3;
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while (pos + 2 < end) {
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struct p2p_reg_class *cl = &ch->reg_class[ch->reg_classes];
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cl->reg_class = *pos++;
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if (pos + 1 + pos[0] > end) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_INFO,
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"P2P: Invalid peer Channel List");
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return -1;
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}
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channels = *pos++;
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cl->channels = channels > P2P_MAX_REG_CLASS_CHANNELS ?
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P2P_MAX_REG_CLASS_CHANNELS : channels;
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os_memcpy(cl->channel, pos, cl->channels);
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pos += channels;
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ch->reg_classes++;
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if (ch->reg_classes == P2P_MAX_REG_CLASSES)
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break;
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}
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p2p_channels_intersect(own, &dev->channels, &intersection);
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Own reg_classes %d "
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"peer reg_classes %d intersection reg_classes %d",
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(int) own->reg_classes,
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(int) dev->channels.reg_classes,
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(int) intersection.reg_classes);
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if (intersection.reg_classes == 0) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_INFO,
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"P2P: No common channels found");
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return -1;
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}
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return 0;
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}
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static int p2p_peer_channels(struct p2p_data *p2p, struct p2p_device *dev,
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const u8 *channel_list, size_t channel_list_len)
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{
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return p2p_peer_channels_check(p2p, &p2p->channels, dev,
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channel_list, channel_list_len);
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}
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static u16 p2p_wps_method_pw_id(enum p2p_wps_method wps_method)
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{
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switch (wps_method) {
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case WPS_PIN_LABEL:
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return DEV_PW_DEFAULT;
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case WPS_PIN_DISPLAY:
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return DEV_PW_REGISTRAR_SPECIFIED;
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case WPS_PIN_KEYPAD:
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return DEV_PW_USER_SPECIFIED;
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case WPS_PBC:
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return DEV_PW_PUSHBUTTON;
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default:
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return DEV_PW_DEFAULT;
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}
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}
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static const char * p2p_wps_method_str(enum p2p_wps_method wps_method)
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{
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switch (wps_method) {
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case WPS_PIN_LABEL:
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return "Label";
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case WPS_PIN_DISPLAY:
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return "Display";
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case WPS_PIN_KEYPAD:
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return "Keypad";
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case WPS_PBC:
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return "PBC";
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default:
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return "??";
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}
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}
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static struct wpabuf * p2p_build_go_neg_req(struct p2p_data *p2p,
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struct p2p_device *peer)
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{
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struct wpabuf *buf;
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u8 *len;
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u8 group_capab;
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buf = wpabuf_alloc(1000);
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if (buf == NULL)
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return NULL;
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peer->dialog_token++;
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if (peer->dialog_token == 0)
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peer->dialog_token = 1;
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p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_REQ, peer->dialog_token);
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len = p2p_buf_add_ie_hdr(buf);
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group_capab = 0;
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if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP)
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group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
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p2p_buf_add_capability(buf, p2p->dev_capab, group_capab);
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p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) |
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p2p->next_tie_breaker);
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p2p->next_tie_breaker = !p2p->next_tie_breaker;
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p2p_buf_add_config_timeout(buf, 100, 20);
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p2p_buf_add_listen_channel(buf, p2p->cfg->country, p2p->cfg->reg_class,
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p2p->cfg->channel);
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if (p2p->ext_listen_interval)
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p2p_buf_add_ext_listen_timing(buf, p2p->ext_listen_period,
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p2p->ext_listen_interval);
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p2p_buf_add_intended_addr(buf, p2p->intended_addr);
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p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels);
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p2p_buf_add_device_info(buf, p2p, peer);
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p2p_buf_add_operating_channel(buf, p2p->cfg->country,
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p2p->op_reg_class, p2p->op_channel);
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p2p_buf_update_ie_hdr(buf, len);
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/* WPS IE with Device Password ID attribute */
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p2p_build_wps_ie(p2p, buf, p2p_wps_method_pw_id(peer->wps_method), 0);
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return buf;
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}
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int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev)
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{
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struct wpabuf *req;
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int freq;
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freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
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if (freq <= 0) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: No Listen/Operating frequency known for the "
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"peer " MACSTR " to send GO Negotiation Request",
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MAC2STR(dev->p2p_device_addr));
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return -1;
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}
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req = p2p_build_go_neg_req(p2p, dev);
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if (req == NULL)
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return -1;
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: Sending GO Negotiation Request");
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p2p_set_state(p2p, P2P_CONNECT);
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p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST;
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p2p->go_neg_peer = dev;
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dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE;
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if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq,
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dev->p2p_device_addr, p2p->cfg->dev_addr,
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dev->p2p_device_addr,
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wpabuf_head(req), wpabuf_len(req), 200) < 0)
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{
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: Failed to send Action frame");
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/* Use P2P find to recover and retry */
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p2p_set_timeout(p2p, 0, 0);
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}
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wpabuf_free(req);
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return 0;
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}
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static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p,
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struct p2p_device *peer,
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u8 dialog_token, u8 status,
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u8 tie_breaker)
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{
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struct wpabuf *buf;
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u8 *len;
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u8 group_capab;
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: Building GO Negotiation Response");
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buf = wpabuf_alloc(1000);
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if (buf == NULL)
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return NULL;
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p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token);
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len = p2p_buf_add_ie_hdr(buf);
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p2p_buf_add_status(buf, status);
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group_capab = 0;
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if (peer && (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP))
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group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
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p2p_buf_add_capability(buf, p2p->dev_capab, group_capab);
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p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker);
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p2p_buf_add_config_timeout(buf, 100, 20);
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if (peer && peer->go_state == REMOTE_GO) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Omit Operating "
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"Channel attribute");
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} else {
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p2p_buf_add_operating_channel(buf, p2p->cfg->country,
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p2p->op_reg_class,
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p2p->op_channel);
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}
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p2p_buf_add_intended_addr(buf, p2p->intended_addr);
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if (status || peer == NULL) {
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p2p_buf_add_channel_list(buf, p2p->cfg->country,
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&p2p->channels);
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} else if (peer->go_state == REMOTE_GO) {
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p2p_buf_add_channel_list(buf, p2p->cfg->country,
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&p2p->channels);
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} else {
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struct p2p_channels res;
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p2p_channels_intersect(&p2p->channels, &peer->channels,
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&res);
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p2p_buf_add_channel_list(buf, p2p->cfg->country, &res);
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}
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p2p_buf_add_device_info(buf, p2p, peer);
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if (peer && peer->go_state == LOCAL_GO) {
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p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid,
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p2p->ssid_len);
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}
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p2p_buf_update_ie_hdr(buf, len);
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/* WPS IE with Device Password ID attribute */
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p2p_build_wps_ie(p2p, buf,
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p2p_wps_method_pw_id(peer ? peer->wps_method :
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WPS_NOT_READY), 0);
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return buf;
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}
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void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa,
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const u8 *data, size_t len, int rx_freq)
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{
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struct p2p_device *dev = NULL;
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struct wpabuf *resp;
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struct p2p_message msg;
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u8 status = P2P_SC_FAIL_INVALID_PARAMS;
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int tie_breaker = 0;
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int freq;
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: Received GO Negotiation Request from " MACSTR
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"(freq=%d)", MAC2STR(sa), rx_freq);
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if (p2p_parse(data, len, &msg))
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return;
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if (!msg.capability) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: Mandatory Capability attribute missing from GO "
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"Negotiation Request");
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#ifdef CONFIG_P2P_STRICT
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goto fail;
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#endif /* CONFIG_P2P_STRICT */
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}
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if (msg.go_intent)
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tie_breaker = *msg.go_intent & 0x01;
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else {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: Mandatory GO Intent attribute missing from GO "
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"Negotiation Request");
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#ifdef CONFIG_P2P_STRICT
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goto fail;
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#endif /* CONFIG_P2P_STRICT */
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}
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if (!msg.config_timeout) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: Mandatory Configuration Timeout attribute "
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"missing from GO Negotiation Request");
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#ifdef CONFIG_P2P_STRICT
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goto fail;
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#endif /* CONFIG_P2P_STRICT */
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}
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if (!msg.listen_channel) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: No Listen Channel attribute received");
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goto fail;
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}
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if (!msg.operating_channel) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: No Operating Channel attribute received");
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goto fail;
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}
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if (!msg.channel_list) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: No Channel List attribute received");
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goto fail;
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}
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if (!msg.intended_addr) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: No Intended P2P Interface Address attribute "
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"received");
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goto fail;
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}
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if (!msg.p2p_device_info) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: No P2P Device Info attribute received");
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goto fail;
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}
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if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: Unexpected GO Negotiation Request SA=" MACSTR
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" != dev_addr=" MACSTR,
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MAC2STR(sa), MAC2STR(msg.p2p_device_addr));
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goto fail;
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}
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dev = p2p_get_device(p2p, sa);
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if (msg.status && *msg.status) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
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"P2P: Unexpected Status attribute (%d) in GO "
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"Negotiation Request", *msg.status);
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goto fail;
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}
|
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|
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if (dev == NULL)
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dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg);
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else if (dev->flags & P2P_DEV_PROBE_REQ_ONLY)
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p2p_add_dev_info(p2p, sa, dev, &msg);
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if (dev && dev->flags & P2P_DEV_USER_REJECTED) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
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"P2P: User has rejected this peer");
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status = P2P_SC_FAIL_REJECTED_BY_USER;
|
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} else if (dev == NULL || dev->wps_method == WPS_NOT_READY) {
|
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
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"P2P: Not ready for GO negotiation with " MACSTR,
|
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MAC2STR(sa));
|
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status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
|
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if (dev)
|
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dev->flags |= P2P_DEV_PEER_WAITING_RESPONSE;
|
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p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa);
|
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} else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) {
|
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Already in Group Formation with another peer");
|
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status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
|
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} else {
|
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int go;
|
|
|
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if (!p2p->go_neg_peer) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Starting "
|
|
"GO Negotiation with previously authorized "
|
|
"peer");
|
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/* TODO: check if force_freq is needed */
|
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p2p->op_reg_class = p2p->cfg->op_reg_class;
|
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p2p->op_channel = p2p->cfg->op_channel;
|
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os_memcpy(&p2p->channels, &p2p->cfg->channels,
|
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sizeof(struct p2p_channels));
|
|
}
|
|
|
|
dev->flags &= ~P2P_DEV_NOT_YET_READY;
|
|
|
|
if (!msg.go_intent) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: No GO Intent attribute received");
|
|
goto fail;
|
|
}
|
|
if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Invalid GO Intent value (%u) received",
|
|
*msg.go_intent >> 1);
|
|
goto fail;
|
|
}
|
|
|
|
if (dev->go_neg_req_sent &&
|
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os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) > 0) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Do not reply since peer has higher "
|
|
"address and GO Neg Request already sent");
|
|
p2p_parse_free(&msg);
|
|
return;
|
|
}
|
|
|
|
go = p2p_go_det(p2p->go_intent, *msg.go_intent);
|
|
if (go < 0) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Incompatible GO Intent");
|
|
status = P2P_SC_FAIL_BOTH_GO_INTENT_15;
|
|
goto fail;
|
|
}
|
|
|
|
if (p2p_peer_channels(p2p, dev, msg.channel_list,
|
|
msg.channel_list_len) < 0) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: No common channels found");
|
|
status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
|
|
goto fail;
|
|
}
|
|
|
|
switch (msg.dev_password_id) {
|
|
case DEV_PW_DEFAULT:
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: PIN from peer Label");
|
|
if (dev->wps_method != WPS_PIN_KEYPAD) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: We have wps_method=%s -> "
|
|
"incompatible",
|
|
p2p_wps_method_str(dev->wps_method));
|
|
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
|
|
goto fail;
|
|
}
|
|
break;
|
|
case DEV_PW_REGISTRAR_SPECIFIED:
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: PIN from peer Display");
|
|
if (dev->wps_method != WPS_PIN_KEYPAD) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: We have wps_method=%s -> "
|
|
"incompatible",
|
|
p2p_wps_method_str(dev->wps_method));
|
|
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
|
|
goto fail;
|
|
}
|
|
break;
|
|
case DEV_PW_USER_SPECIFIED:
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Peer entered PIN on Keypad");
|
|
if (dev->wps_method != WPS_PIN_LABEL &&
|
|
dev->wps_method != WPS_PIN_DISPLAY) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: We have wps_method=%s -> "
|
|
"incompatible",
|
|
p2p_wps_method_str(dev->wps_method));
|
|
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
|
|
goto fail;
|
|
}
|
|
break;
|
|
case DEV_PW_PUSHBUTTON:
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Peer using pushbutton");
|
|
if (dev->wps_method != WPS_PBC) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: We have wps_method=%s -> "
|
|
"incompatible",
|
|
p2p_wps_method_str(dev->wps_method));
|
|
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
|
|
goto fail;
|
|
}
|
|
break;
|
|
default:
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Unsupported Device Password ID %d",
|
|
msg.dev_password_id);
|
|
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
|
|
goto fail;
|
|
}
|
|
|
|
if (go) {
|
|
struct p2p_channels intersection;
|
|
size_t i;
|
|
p2p_channels_intersect(&p2p->channels, &dev->channels,
|
|
&intersection);
|
|
if (intersection.reg_classes == 0 ||
|
|
intersection.reg_class[0].channels == 0) {
|
|
status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: No common channels found");
|
|
goto fail;
|
|
}
|
|
for (i = 0; i < intersection.reg_classes; i++) {
|
|
struct p2p_reg_class *c;
|
|
c = &intersection.reg_class[i];
|
|
wpa_printf(MSG_DEBUG, "P2P: reg_class %u",
|
|
c->reg_class);
|
|
wpa_hexdump(MSG_DEBUG, "P2P: channels",
|
|
c->channel, c->channels);
|
|
}
|
|
if (!p2p_channels_includes(&intersection,
|
|
p2p->op_reg_class,
|
|
p2p->op_channel)) {
|
|
struct p2p_reg_class *cl;
|
|
cl = &intersection.reg_class[0];
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Selected operating channel "
|
|
"(reg_class %u channel %u) not "
|
|
"acceptable to the peer - pick "
|
|
"another channel (reg_class %u "
|
|
"channel %u)",
|
|
p2p->op_reg_class, p2p->op_channel,
|
|
cl->reg_class, cl->channel[0]);
|
|
p2p->op_reg_class = cl->reg_class;
|
|
p2p->op_channel = cl->channel[0];
|
|
}
|
|
|
|
p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len);
|
|
}
|
|
|
|
dev->go_state = go ? LOCAL_GO : REMOTE_GO;
|
|
dev->oper_freq = p2p_channel_to_freq((const char *)
|
|
msg.operating_channel,
|
|
msg.operating_channel[3],
|
|
msg.operating_channel[4]);
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer operating "
|
|
"channel preference: %d MHz", dev->oper_freq);
|
|
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: GO Negotiation with " MACSTR, MAC2STR(sa));
|
|
if (p2p->state != P2P_IDLE)
|
|
p2p_stop_find(p2p);
|
|
p2p_set_state(p2p, P2P_GO_NEG);
|
|
p2p_clear_timeout(p2p);
|
|
dev->dialog_token = msg.dialog_token;
|
|
os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN);
|
|
p2p->go_neg_peer = dev;
|
|
status = P2P_SC_SUCCESS;
|
|
}
|
|
|
|
fail:
|
|
resp = p2p_build_go_neg_resp(p2p, dev, msg.dialog_token, status,
|
|
!tie_breaker);
|
|
p2p_parse_free(&msg);
|
|
if (resp == NULL)
|
|
return;
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Sending GO Negotiation Response");
|
|
if (rx_freq > 0)
|
|
freq = rx_freq;
|
|
else
|
|
freq = p2p_channel_to_freq(p2p->cfg->country,
|
|
p2p->cfg->reg_class,
|
|
p2p->cfg->channel);
|
|
if (freq < 0) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Unknown regulatory class/channel");
|
|
wpabuf_free(resp);
|
|
return;
|
|
}
|
|
if (status == P2P_SC_SUCCESS) {
|
|
p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE;
|
|
dev->flags |= P2P_DEV_WAIT_GO_NEG_CONFIRM;
|
|
} else
|
|
p2p->pending_action_state =
|
|
P2P_PENDING_GO_NEG_RESPONSE_FAILURE;
|
|
if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq, sa,
|
|
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);
|
|
}
|
|
|
|
|
|
static struct wpabuf * p2p_build_go_neg_conf(struct p2p_data *p2p,
|
|
struct p2p_device *peer,
|
|
u8 dialog_token, u8 status,
|
|
const u8 *resp_chan, int go)
|
|
{
|
|
struct wpabuf *buf;
|
|
u8 *len;
|
|
struct p2p_channels res;
|
|
u8 group_capab;
|
|
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Building GO Negotiation Confirm");
|
|
buf = wpabuf_alloc(1000);
|
|
if (buf == NULL)
|
|
return NULL;
|
|
|
|
p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_CONF, dialog_token);
|
|
|
|
len = p2p_buf_add_ie_hdr(buf);
|
|
p2p_buf_add_status(buf, status);
|
|
group_capab = 0;
|
|
if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP)
|
|
group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP;
|
|
p2p_buf_add_capability(buf, p2p->dev_capab, group_capab);
|
|
if (go || resp_chan == NULL)
|
|
p2p_buf_add_operating_channel(buf, p2p->cfg->country,
|
|
p2p->op_reg_class,
|
|
p2p->op_channel);
|
|
else
|
|
p2p_buf_add_operating_channel(buf, (const char *) resp_chan,
|
|
resp_chan[3], resp_chan[4]);
|
|
p2p_channels_intersect(&p2p->channels, &peer->channels, &res);
|
|
p2p_buf_add_channel_list(buf, p2p->cfg->country, &res);
|
|
if (go) {
|
|
p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid,
|
|
p2p->ssid_len);
|
|
}
|
|
p2p_buf_update_ie_hdr(buf, len);
|
|
|
|
return buf;
|
|
}
|
|
|
|
|
|
void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa,
|
|
const u8 *data, size_t len, int rx_freq)
|
|
{
|
|
struct p2p_device *dev;
|
|
struct wpabuf *conf;
|
|
int go = -1;
|
|
struct p2p_message msg;
|
|
u8 status = P2P_SC_SUCCESS;
|
|
int freq;
|
|
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Received GO Negotiation Response from " MACSTR
|
|
" (freq=%d)", MAC2STR(sa), rx_freq);
|
|
dev = p2p_get_device(p2p, sa);
|
|
if (dev == NULL || dev->wps_method == WPS_NOT_READY ||
|
|
dev != p2p->go_neg_peer) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Not ready for GO negotiation with " MACSTR,
|
|
MAC2STR(sa));
|
|
return;
|
|
}
|
|
|
|
if (p2p_parse(data, len, &msg))
|
|
return;
|
|
|
|
if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_RESPONSE)) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Was not expecting GO Negotiation Response - "
|
|
"ignore");
|
|
p2p_parse_free(&msg);
|
|
return;
|
|
}
|
|
dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE;
|
|
|
|
if (msg.dialog_token != dev->dialog_token) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Unexpected Dialog Token %u (expected %u)",
|
|
msg.dialog_token, dev->dialog_token);
|
|
p2p_parse_free(&msg);
|
|
return;
|
|
}
|
|
|
|
if (!msg.status) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: No Status attribute received");
|
|
status = P2P_SC_FAIL_INVALID_PARAMS;
|
|
goto fail;
|
|
}
|
|
if (*msg.status) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: GO Negotiation rejected: status %d",
|
|
*msg.status);
|
|
dev->go_neg_req_sent = 0;
|
|
if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Wait for the peer to become ready for "
|
|
"GO Negotiation");
|
|
dev->flags |= P2P_DEV_NOT_YET_READY;
|
|
dev->wait_count = 0;
|
|
p2p_set_state(p2p, P2P_WAIT_PEER_IDLE);
|
|
p2p_set_timeout(p2p, 0, 0);
|
|
} else {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Stop GO Negotiation attempt");
|
|
p2p_go_neg_failed(p2p, dev, *msg.status);
|
|
}
|
|
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
|
|
p2p_parse_free(&msg);
|
|
return;
|
|
}
|
|
|
|
if (!msg.capability) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Mandatory Capability attribute missing from GO "
|
|
"Negotiation Response");
|
|
#ifdef CONFIG_P2P_STRICT
|
|
status = P2P_SC_FAIL_INVALID_PARAMS;
|
|
goto fail;
|
|
#endif /* CONFIG_P2P_STRICT */
|
|
}
|
|
|
|
if (!msg.p2p_device_info) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Mandatory P2P Device Info attribute missing "
|
|
"from GO Negotiation Response");
|
|
#ifdef CONFIG_P2P_STRICT
|
|
status = P2P_SC_FAIL_INVALID_PARAMS;
|
|
goto fail;
|
|
#endif /* CONFIG_P2P_STRICT */
|
|
}
|
|
|
|
if (!msg.intended_addr) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: No Intended P2P Interface Address attribute "
|
|
"received");
|
|
status = P2P_SC_FAIL_INVALID_PARAMS;
|
|
goto fail;
|
|
}
|
|
|
|
if (!msg.go_intent) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: No GO Intent attribute received");
|
|
status = P2P_SC_FAIL_INVALID_PARAMS;
|
|
goto fail;
|
|
}
|
|
if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Invalid GO Intent value (%u) received",
|
|
*msg.go_intent >> 1);
|
|
status = P2P_SC_FAIL_INVALID_PARAMS;
|
|
goto fail;
|
|
}
|
|
|
|
go = p2p_go_det(p2p->go_intent, *msg.go_intent);
|
|
if (go < 0) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Incompatible GO Intent");
|
|
status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
|
|
goto fail;
|
|
}
|
|
|
|
if (!go && msg.group_id) {
|
|
/* TODO: Store SSID for Provisioning step */
|
|
} else if (!go) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Mandatory P2P Group ID attribute missing from "
|
|
"GO Negotiation Response");
|
|
#ifdef CONFIG_P2P_STRICT
|
|
status = P2P_SC_FAIL_INVALID_PARAMS;
|
|
goto fail;
|
|
#endif /* CONFIG_P2P_STRICT */
|
|
}
|
|
|
|
if (!msg.config_timeout) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Mandatory Configuration Timeout attribute "
|
|
"missing from GO Negotiation Response");
|
|
#ifdef CONFIG_P2P_STRICT
|
|
status = P2P_SC_FAIL_INVALID_PARAMS;
|
|
goto fail;
|
|
#endif /* CONFIG_P2P_STRICT */
|
|
}
|
|
|
|
if (!msg.operating_channel && !go) {
|
|
/*
|
|
* Note: P2P Client may omit Operating Channel attribute to
|
|
* indicate it does not have a preference.
|
|
*/
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: No Operating Channel attribute received");
|
|
status = P2P_SC_FAIL_INVALID_PARAMS;
|
|
goto fail;
|
|
}
|
|
if (!msg.channel_list) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: No Channel List attribute received");
|
|
status = P2P_SC_FAIL_INVALID_PARAMS;
|
|
goto fail;
|
|
}
|
|
|
|
if (p2p_peer_channels(p2p, dev, msg.channel_list,
|
|
msg.channel_list_len) < 0) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: No common channels found");
|
|
status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
|
|
goto fail;
|
|
}
|
|
|
|
if (msg.operating_channel) {
|
|
dev->oper_freq = p2p_channel_to_freq((const char *)
|
|
msg.operating_channel,
|
|
msg.operating_channel[3],
|
|
msg.operating_channel[4]);
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer operating "
|
|
"channel preference: %d MHz", dev->oper_freq);
|
|
} else
|
|
dev->oper_freq = 0;
|
|
|
|
switch (msg.dev_password_id) {
|
|
case DEV_PW_DEFAULT:
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: PIN from peer Label");
|
|
if (dev->wps_method != WPS_PIN_KEYPAD) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: We have wps_method=%s -> "
|
|
"incompatible",
|
|
p2p_wps_method_str(dev->wps_method));
|
|
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
|
|
goto fail;
|
|
}
|
|
break;
|
|
case DEV_PW_REGISTRAR_SPECIFIED:
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: PIN from peer Display");
|
|
if (dev->wps_method != WPS_PIN_KEYPAD) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: We have wps_method=%s -> "
|
|
"incompatible",
|
|
p2p_wps_method_str(dev->wps_method));
|
|
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
|
|
goto fail;
|
|
}
|
|
break;
|
|
case DEV_PW_USER_SPECIFIED:
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Peer entered PIN on Keypad");
|
|
if (dev->wps_method != WPS_PIN_LABEL &&
|
|
dev->wps_method != WPS_PIN_DISPLAY) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: We have wps_method=%s -> "
|
|
"incompatible",
|
|
p2p_wps_method_str(dev->wps_method));
|
|
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
|
|
goto fail;
|
|
}
|
|
break;
|
|
case DEV_PW_PUSHBUTTON:
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Peer using pushbutton");
|
|
if (dev->wps_method != WPS_PBC) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: We have wps_method=%s -> "
|
|
"incompatible",
|
|
p2p_wps_method_str(dev->wps_method));
|
|
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
|
|
goto fail;
|
|
}
|
|
break;
|
|
default:
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Unsupported Device Password ID %d",
|
|
msg.dev_password_id);
|
|
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
|
|
goto fail;
|
|
}
|
|
|
|
if (go) {
|
|
struct p2p_channels intersection;
|
|
size_t i;
|
|
p2p_channels_intersect(&p2p->channels, &dev->channels,
|
|
&intersection);
|
|
if (intersection.reg_classes == 0 ||
|
|
intersection.reg_class[0].channels == 0) {
|
|
status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: No common channels found");
|
|
goto fail;
|
|
}
|
|
for (i = 0; i < intersection.reg_classes; i++) {
|
|
struct p2p_reg_class *c;
|
|
c = &intersection.reg_class[i];
|
|
wpa_printf(MSG_DEBUG, "P2P: reg_class %u",
|
|
c->reg_class);
|
|
wpa_hexdump(MSG_DEBUG, "P2P: channels",
|
|
c->channel, c->channels);
|
|
}
|
|
if (!p2p_channels_includes(&intersection, p2p->op_reg_class,
|
|
p2p->op_channel)) {
|
|
struct p2p_reg_class *cl;
|
|
cl = &intersection.reg_class[0];
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Selected operating channel "
|
|
"(reg_class %u channel %u) not "
|
|
"acceptable to the peer - pick "
|
|
"another channel (reg_class %u "
|
|
"channel %u)",
|
|
p2p->op_reg_class, p2p->op_channel,
|
|
cl->reg_class, cl->channel[0]);
|
|
p2p->op_reg_class = cl->reg_class;
|
|
p2p->op_channel = cl->channel[0];
|
|
}
|
|
|
|
p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len);
|
|
}
|
|
|
|
p2p_set_state(p2p, P2P_GO_NEG);
|
|
p2p_clear_timeout(p2p);
|
|
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: GO Negotiation with " MACSTR, MAC2STR(sa));
|
|
os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN);
|
|
|
|
fail:
|
|
conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token, status,
|
|
msg.operating_channel, go);
|
|
p2p_parse_free(&msg);
|
|
if (conf == NULL)
|
|
return;
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Sending GO Negotiation Confirm");
|
|
if (status == P2P_SC_SUCCESS) {
|
|
p2p->pending_action_state = P2P_PENDING_GO_NEG_CONFIRM;
|
|
dev->go_state = go ? LOCAL_GO : REMOTE_GO;
|
|
} else
|
|
p2p->pending_action_state = P2P_NO_PENDING_ACTION;
|
|
if (rx_freq > 0)
|
|
freq = rx_freq;
|
|
else
|
|
freq = dev->listen_freq;
|
|
if (p2p->cfg->send_action(p2p->cfg->cb_ctx, freq, sa,
|
|
p2p->cfg->dev_addr, sa,
|
|
wpabuf_head(conf), wpabuf_len(conf), 200) <
|
|
0) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Failed to send Action frame");
|
|
p2p_go_neg_failed(p2p, dev, -1);
|
|
}
|
|
wpabuf_free(conf);
|
|
}
|
|
|
|
|
|
void p2p_process_go_neg_conf(struct p2p_data *p2p, const u8 *sa,
|
|
const u8 *data, size_t len)
|
|
{
|
|
struct p2p_device *dev;
|
|
struct p2p_message msg;
|
|
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Received GO Negotiation Confirm from " MACSTR,
|
|
MAC2STR(sa));
|
|
dev = p2p_get_device(p2p, sa);
|
|
if (dev == NULL || dev->wps_method == WPS_NOT_READY ||
|
|
dev != p2p->go_neg_peer) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Not ready for GO negotiation with " MACSTR,
|
|
MAC2STR(sa));
|
|
return;
|
|
}
|
|
|
|
if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Stopped waiting "
|
|
"for TX status on GO Negotiation Response since we "
|
|
"already received Confirmation");
|
|
p2p->pending_action_state = P2P_NO_PENDING_ACTION;
|
|
}
|
|
|
|
if (p2p_parse(data, len, &msg))
|
|
return;
|
|
|
|
if (!(dev->flags & P2P_DEV_WAIT_GO_NEG_CONFIRM)) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Was not expecting GO Negotiation Confirm - "
|
|
"ignore");
|
|
return;
|
|
}
|
|
dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM;
|
|
|
|
if (msg.dialog_token != dev->dialog_token) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Unexpected Dialog Token %u (expected %u)",
|
|
msg.dialog_token, dev->dialog_token);
|
|
p2p_parse_free(&msg);
|
|
return;
|
|
}
|
|
|
|
if (!msg.status) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: No Status attribute received");
|
|
p2p_parse_free(&msg);
|
|
return;
|
|
}
|
|
if (*msg.status) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: GO Negotiation rejected: status %d",
|
|
*msg.status);
|
|
p2p_parse_free(&msg);
|
|
return;
|
|
}
|
|
|
|
if (dev->go_state == REMOTE_GO && msg.group_id) {
|
|
/* TODO: Store SSID for Provisioning step */
|
|
} else if (dev->go_state == REMOTE_GO) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Mandatory P2P Group ID attribute missing from "
|
|
"GO Negotiation Confirmation");
|
|
#ifdef CONFIG_P2P_STRICT
|
|
p2p_parse_free(&msg);
|
|
return;
|
|
#endif /* CONFIG_P2P_STRICT */
|
|
}
|
|
|
|
if (!msg.operating_channel) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Mandatory Operating Channel attribute missing "
|
|
"from GO Negotiation Confirmation");
|
|
#ifdef CONFIG_P2P_STRICT
|
|
p2p_parse_free(&msg);
|
|
return;
|
|
#endif /* CONFIG_P2P_STRICT */
|
|
}
|
|
|
|
if (!msg.channel_list) {
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Mandatory Operating Channel attribute missing "
|
|
"from GO Negotiation Confirmation");
|
|
#ifdef CONFIG_P2P_STRICT
|
|
p2p_parse_free(&msg);
|
|
return;
|
|
#endif /* CONFIG_P2P_STRICT */
|
|
}
|
|
|
|
p2p_parse_free(&msg);
|
|
|
|
if (dev->go_state == UNKNOWN_GO) {
|
|
/*
|
|
* This should not happen since GO negotiation has already
|
|
* been completed.
|
|
*/
|
|
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
|
|
"P2P: Unexpected GO Neg state - do not know which end "
|
|
"becomes GO");
|
|
return;
|
|
}
|
|
|
|
p2p_go_complete(p2p, dev);
|
|
}
|