/* * Wi-Fi Direct - P2P Group Owner Negotiation * Copyright (c) 2009-2010, 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 "wps/wps_defs.h" #include "p2p_i.h" #include "p2p.h" static int p2p_go_det(u8 own_intent, u8 peer_value) { u8 peer_intent = peer_value >> 1; if (own_intent == peer_intent) { if (own_intent == P2P_MAX_GO_INTENT) return -1; /* both devices want to become GO */ /* Use tie breaker bit to determine GO */ return (peer_value & 0x01) ? 0 : 1; } return own_intent > peer_intent; } int p2p_peer_channels_check(struct p2p_data *p2p, struct p2p_channels *own, struct p2p_device *dev, const u8 *channel_list, size_t channel_list_len) { const u8 *pos, *end; struct p2p_channels *ch; size_t channels; struct p2p_channels intersection; ch = &dev->channels; os_memset(ch, 0, sizeof(*ch)); pos = channel_list; end = channel_list + channel_list_len; if (end - pos < 3) return -1; os_memcpy(dev->country, pos, 3); wpa_hexdump_ascii(MSG_DEBUG, "P2P: Peer country", pos, 3); if (pos[2] != 0x04 && os_memcmp(pos, p2p->cfg->country, 2) != 0) { wpa_msg(p2p->cfg->msg_ctx, MSG_INFO, "P2P: Mismatching country (ours=%c%c peer's=%c%c)", p2p->cfg->country[0], p2p->cfg->country[1], pos[0], pos[1]); return -1; } pos += 3; while (pos + 2 < end) { struct p2p_reg_class *cl = &ch->reg_class[ch->reg_classes]; cl->reg_class = *pos++; if (pos + 1 + pos[0] > end) { wpa_msg(p2p->cfg->msg_ctx, MSG_INFO, "P2P: Invalid peer Channel List"); return -1; } channels = *pos++; cl->channels = channels > P2P_MAX_REG_CLASS_CHANNELS ? P2P_MAX_REG_CLASS_CHANNELS : channels; os_memcpy(cl->channel, pos, cl->channels); pos += channels; ch->reg_classes++; if (ch->reg_classes == P2P_MAX_REG_CLASSES) break; } p2p_channels_intersect(own, &dev->channels, &intersection); wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Own reg_classes %d " "peer reg_classes %d intersection reg_classes %d", (int) own->reg_classes, (int) dev->channels.reg_classes, (int) intersection.reg_classes); if (intersection.reg_classes == 0) { wpa_msg(p2p->cfg->msg_ctx, MSG_INFO, "P2P: No common channels found"); return -1; } return 0; } static int p2p_peer_channels(struct p2p_data *p2p, struct p2p_device *dev, const u8 *channel_list, size_t channel_list_len) { return p2p_peer_channels_check(p2p, &p2p->channels, dev, channel_list, channel_list_len); } u16 p2p_wps_method_pw_id(enum p2p_wps_method wps_method) { switch (wps_method) { case WPS_PIN_DISPLAY: return DEV_PW_REGISTRAR_SPECIFIED; case WPS_PIN_KEYPAD: return DEV_PW_USER_SPECIFIED; case WPS_PBC: return DEV_PW_PUSHBUTTON; default: return DEV_PW_DEFAULT; } } static const char * p2p_wps_method_str(enum p2p_wps_method wps_method) { switch (wps_method) { case WPS_PIN_DISPLAY: return "Display"; case WPS_PIN_KEYPAD: return "Keypad"; case WPS_PBC: return "PBC"; default: return "??"; } } static struct wpabuf * p2p_build_go_neg_req(struct p2p_data *p2p, struct p2p_device *peer) { struct wpabuf *buf; u8 *len; u8 group_capab; size_t extra = 0; #ifdef CONFIG_WIFI_DISPLAY if (p2p->wfd_ie_go_neg) extra = wpabuf_len(p2p->wfd_ie_go_neg); #endif /* CONFIG_WIFI_DISPLAY */ buf = wpabuf_alloc(1000 + extra); if (buf == NULL) return NULL; peer->dialog_token++; if (peer->dialog_token == 0) peer->dialog_token = 1; p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_REQ, peer->dialog_token); len = p2p_buf_add_ie_hdr(buf); group_capab = 0; if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN; } if (p2p->cross_connect) group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; if (p2p->cfg->p2p_intra_bss) group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; p2p_buf_add_capability(buf, p2p->dev_capab & ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, group_capab); p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | p2p->next_tie_breaker); p2p->next_tie_breaker = !p2p->next_tie_breaker; p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); p2p_buf_add_listen_channel(buf, p2p->cfg->country, p2p->cfg->reg_class, p2p->cfg->channel); if (p2p->ext_listen_interval) p2p_buf_add_ext_listen_timing(buf, p2p->ext_listen_period, p2p->ext_listen_interval); p2p_buf_add_intended_addr(buf, p2p->intended_addr); p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); p2p_buf_add_device_info(buf, p2p, peer); p2p_buf_add_operating_channel(buf, p2p->cfg->country, p2p->op_reg_class, p2p->op_channel); p2p_buf_update_ie_hdr(buf, len); /* WPS IE with Device Password ID attribute */ p2p_build_wps_ie(p2p, buf, p2p_wps_method_pw_id(peer->wps_method), 0); #ifdef CONFIG_WIFI_DISPLAY if (p2p->wfd_ie_go_neg) wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); #endif /* CONFIG_WIFI_DISPLAY */ return buf; } int p2p_connect_send(struct p2p_data *p2p, struct p2p_device *dev) { struct wpabuf *req; int freq; if (dev->flags & P2P_DEV_PD_BEFORE_GO_NEG) { u16 config_method; wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Use PD-before-GO-Neg workaround for " MACSTR, MAC2STR(dev->info.p2p_device_addr)); if (dev->wps_method == WPS_PIN_DISPLAY) config_method = WPS_CONFIG_KEYPAD; else if (dev->wps_method == WPS_PIN_KEYPAD) config_method = WPS_CONFIG_DISPLAY; else if (dev->wps_method == WPS_PBC) config_method = WPS_CONFIG_PUSHBUTTON; else return -1; return p2p_prov_disc_req(p2p, dev->info.p2p_device_addr, config_method, 0, 0); } freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; if (freq <= 0) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: No Listen/Operating frequency known for the " "peer " MACSTR " to send GO Negotiation Request", MAC2STR(dev->info.p2p_device_addr)); return -1; } req = p2p_build_go_neg_req(p2p, dev); if (req == NULL) return -1; wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Sending GO Negotiation Request"); p2p_set_state(p2p, P2P_CONNECT); p2p->pending_action_state = P2P_PENDING_GO_NEG_REQUEST; p2p->go_neg_peer = dev; dev->flags |= P2P_DEV_WAIT_GO_NEG_RESPONSE; dev->connect_reqs++; if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, p2p->cfg->dev_addr, dev->info.p2p_device_addr, wpabuf_head(req), wpabuf_len(req), 200) < 0) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Failed to send Action frame"); /* Use P2P find to recover and retry */ p2p_set_timeout(p2p, 0, 0); } else dev->go_neg_req_sent++; wpabuf_free(req); return 0; } static struct wpabuf * p2p_build_go_neg_resp(struct p2p_data *p2p, struct p2p_device *peer, u8 dialog_token, u8 status, u8 tie_breaker) { struct wpabuf *buf; u8 *len; u8 group_capab; size_t extra = 0; wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Building GO Negotiation Response"); #ifdef CONFIG_WIFI_DISPLAY if (p2p->wfd_ie_go_neg) extra = wpabuf_len(p2p->wfd_ie_go_neg); #endif /* CONFIG_WIFI_DISPLAY */ buf = wpabuf_alloc(1000 + extra); if (buf == NULL) return NULL; p2p_buf_add_public_action_hdr(buf, P2P_GO_NEG_RESP, dialog_token); len = p2p_buf_add_ie_hdr(buf); p2p_buf_add_status(buf, status); group_capab = 0; if (peer && peer->go_state == LOCAL_GO) { if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN; } if (p2p->cross_connect) group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; if (p2p->cfg->p2p_intra_bss) group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; } p2p_buf_add_capability(buf, p2p->dev_capab & ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, group_capab); p2p_buf_add_go_intent(buf, (p2p->go_intent << 1) | tie_breaker); p2p_buf_add_config_timeout(buf, p2p->go_timeout, p2p->client_timeout); if (peer && peer->go_state == REMOTE_GO) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Omit Operating " "Channel attribute"); } else { p2p_buf_add_operating_channel(buf, p2p->cfg->country, p2p->op_reg_class, p2p->op_channel); } p2p_buf_add_intended_addr(buf, p2p->intended_addr); if (status || peer == NULL) { p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); } else if (peer->go_state == REMOTE_GO) { p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); } else { struct p2p_channels res; p2p_channels_intersect(&p2p->channels, &peer->channels, &res); p2p_buf_add_channel_list(buf, p2p->cfg->country, &res); } p2p_buf_add_device_info(buf, p2p, peer); if (peer && peer->go_state == LOCAL_GO) { p2p_buf_add_group_id(buf, p2p->cfg->dev_addr, p2p->ssid, p2p->ssid_len); } p2p_buf_update_ie_hdr(buf, len); /* WPS IE with Device Password ID attribute */ p2p_build_wps_ie(p2p, buf, p2p_wps_method_pw_id(peer ? peer->wps_method : WPS_NOT_READY), 0); #ifdef CONFIG_WIFI_DISPLAY if (p2p->wfd_ie_go_neg) wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); #endif /* CONFIG_WIFI_DISPLAY */ return buf; } void p2p_reselect_channel(struct p2p_data *p2p, struct p2p_channels *intersection) { struct p2p_reg_class *cl; int freq; u8 op_reg_class, op_channel; unsigned int i; wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Selected operating " "channel (reg_class %u channel %u) not acceptable to the " "peer", p2p->op_reg_class, p2p->op_channel); /* First, try to pick the best channel from another band */ freq = p2p_channel_to_freq(p2p->cfg->country, p2p->op_reg_class, p2p->op_channel); if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 && p2p_freq_to_channel(p2p->cfg->country, p2p->best_freq_5, &op_reg_class, &op_channel) == 0 && p2p_channels_includes(intersection, op_reg_class, op_channel)) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick best 5 GHz " "channel (reg_class %u channel %u) from intersection", op_reg_class, op_channel); p2p->op_reg_class = op_reg_class; p2p->op_channel = op_channel; return; } if (freq >= 4900 && freq < 6000 && p2p->best_freq_24 > 0 && p2p_freq_to_channel(p2p->cfg->country, p2p->best_freq_24, &op_reg_class, &op_channel) == 0 && p2p_channels_includes(intersection, op_reg_class, op_channel)) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick best 2.4 GHz " "channel (reg_class %u channel %u) from intersection", op_reg_class, op_channel); p2p->op_reg_class = op_reg_class; p2p->op_channel = op_channel; return; } /* Select channel with highest preference if the peer supports it */ for (i = 0; p2p->cfg->pref_chan && i < p2p->cfg->num_pref_chan; i++) { if (p2p_channels_includes(intersection, p2p->cfg->pref_chan[i].op_class, p2p->cfg->pref_chan[i].chan)) { p2p->op_reg_class = p2p->cfg->pref_chan[i].op_class; p2p->op_channel = p2p->cfg->pref_chan[i].chan; wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick " "highest preferred chnnel (op_class %u " "channel %u) from intersection", p2p->op_reg_class, p2p->op_channel); return; } } /* * Fall back to whatever is included in the channel intersection since * no better options seems to be available. */ cl = &intersection->reg_class[0]; wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Pick another channel " "(reg_class %u channel %u) from intersection", cl->reg_class, cl->channel[0]); p2p->op_reg_class = cl->reg_class; p2p->op_channel = cl->channel[0]; } void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa, const u8 *data, size_t len, int rx_freq) { struct p2p_device *dev = NULL; struct wpabuf *resp; struct p2p_message msg; u8 status = P2P_SC_FAIL_INVALID_PARAMS; int tie_breaker = 0; int freq; wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Received GO Negotiation Request from " MACSTR "(freq=%d)", MAC2STR(sa), rx_freq); if (p2p_parse(data, len, &msg)) return; if (!msg.capability) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Mandatory Capability attribute missing from GO " "Negotiation Request"); #ifdef CONFIG_P2P_STRICT goto fail; #endif /* CONFIG_P2P_STRICT */ } if (msg.go_intent) tie_breaker = *msg.go_intent & 0x01; else { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Mandatory GO Intent attribute missing from GO " "Negotiation Request"); #ifdef CONFIG_P2P_STRICT 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 Request"); #ifdef CONFIG_P2P_STRICT goto fail; #endif /* CONFIG_P2P_STRICT */ } if (!msg.listen_channel) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: No Listen Channel attribute received"); goto fail; } if (!msg.operating_channel) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: No Operating Channel attribute received"); goto fail; } if (!msg.channel_list) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: No Channel List attribute received"); goto fail; } if (!msg.intended_addr) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: No Intended P2P Interface Address attribute " "received"); goto fail; } if (!msg.p2p_device_info) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: No P2P Device Info attribute received"); goto fail; } if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Unexpected GO Negotiation Request SA=" MACSTR " != dev_addr=" MACSTR, MAC2STR(sa), MAC2STR(msg.p2p_device_addr)); goto fail; } dev = p2p_get_device(p2p, sa); if (msg.status && *msg.status) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Unexpected Status attribute (%d) in GO " "Negotiation Request", *msg.status); goto fail; } if (dev == NULL) dev = p2p_add_dev_from_go_neg_req(p2p, sa, &msg); else if (dev->flags & P2P_DEV_PROBE_REQ_ONLY) p2p_add_dev_info(p2p, sa, dev, &msg); if (dev && dev->flags & P2P_DEV_USER_REJECTED) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: User has rejected this peer"); status = P2P_SC_FAIL_REJECTED_BY_USER; } else if (dev == NULL || dev->wps_method == WPS_NOT_READY) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Not ready for GO negotiation with " MACSTR, MAC2STR(sa)); status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; if (dev) dev->flags |= P2P_DEV_PEER_WAITING_RESPONSE; p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa, msg.dev_password_id); } else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Already in Group Formation with another peer"); status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE; } else { int go; if (!p2p->go_neg_peer) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Starting " "GO Negotiation with previously authorized " "peer"); if (!(dev->flags & P2P_DEV_FORCE_FREQ)) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Use default channel settings"); p2p->op_reg_class = p2p->cfg->op_reg_class; p2p->op_channel = p2p->cfg->op_channel; os_memcpy(&p2p->channels, &p2p->cfg->channels, sizeof(struct p2p_channels)); } else { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Use previously configured " "forced channel settings"); } } 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 && 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_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_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)) p2p_reselect_channel(p2p, &intersection); if (!p2p->ssid_set) { p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len); p2p->ssid_set = 1; } } 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); if (msg.config_timeout) { dev->go_timeout = msg.config_timeout[0]; dev->client_timeout = msg.config_timeout[1]; } wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: GO Negotiation with " MACSTR, MAC2STR(sa)); if (p2p->state != P2P_IDLE) p2p_stop_find_for_freq(p2p, rx_freq); 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: if (dev) dev->status = status; 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; if (os_memcmp(sa, p2p->cfg->dev_addr, ETH_ALEN) < 0) { /* * Peer has smaller address, so the GO Negotiation * Response from us is expected to complete * negotiation. Ignore a GO Negotiation Response from * the peer if it happens to be received after this * point due to a race condition in GO Negotiation * Request transmission and processing. */ dev->flags &= ~P2P_DEV_WAIT_GO_NEG_RESPONSE; } } else p2p->pending_action_state = P2P_PENDING_GO_NEG_RESPONSE_FAILURE; if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, p2p->cfg->dev_addr, wpabuf_head(resp), wpabuf_len(resp), 250) < 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; size_t extra = 0; wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Building GO Negotiation Confirm"); #ifdef CONFIG_WIFI_DISPLAY if (p2p->wfd_ie_go_neg) extra = wpabuf_len(p2p->wfd_ie_go_neg); #endif /* CONFIG_WIFI_DISPLAY */ buf = wpabuf_alloc(1000 + extra); 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->go_state == LOCAL_GO) { if (peer->flags & P2P_DEV_PREFER_PERSISTENT_GROUP) { group_capab |= P2P_GROUP_CAPAB_PERSISTENT_GROUP; if (peer->flags & P2P_DEV_PREFER_PERSISTENT_RECONN) group_capab |= P2P_GROUP_CAPAB_PERSISTENT_RECONN; } if (p2p->cross_connect) group_capab |= P2P_GROUP_CAPAB_CROSS_CONN; if (p2p->cfg->p2p_intra_bss) group_capab |= P2P_GROUP_CAPAB_INTRA_BSS_DIST; } p2p_buf_add_capability(buf, p2p->dev_capab & ~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 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); #ifdef CONFIG_WIFI_DISPLAY if (p2p->wfd_ie_go_neg) wpabuf_put_buf(buf, p2p->wfd_ie_go_neg); #endif /* CONFIG_WIFI_DISPLAY */ 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) { /* Store SSID for Provisioning step */ p2p->ssid_len = msg.group_id_len - ETH_ALEN; os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); } else if (!go) { wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Mandatory P2P Group ID attribute missing from " "GO Negotiation Response"); p2p->ssid_len = 0; #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 */ } else { dev->go_timeout = msg.config_timeout[0]; dev->client_timeout = msg.config_timeout[1]; } 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_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_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)) p2p_reselect_channel(p2p, &intersection); if (!p2p->ssid_set) { p2p_build_ssid(p2p, p2p->ssid, &p2p->ssid_len); p2p->ssid_set = 1; } } 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_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa, wpabuf_head(conf), wpabuf_len(conf), 0) < 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) { /* Store SSID for Provisioning step */ p2p->ssid_len = msg.group_id_len - ETH_ALEN; os_memcpy(p2p->ssid, msg.group_id + ETH_ALEN, p2p->ssid_len); } 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"); p2p->ssid_len = 0; #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 */ } #ifdef ANDROID_P2P 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; #endif 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; } /* * The peer could have missed our ctrl::ack frame for GO Negotiation * Confirm and continue retransmitting the frame. To reduce the * likelihood of the peer not getting successful TX status for the * GO Negotiation Confirm frame, wait a short time here before starting * the group so that we will remain on the current channel to * acknowledge any possible retransmission from the peer. */ wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: 20 ms wait on current " "channel before starting group"); os_sleep(0, 20000); p2p_go_complete(p2p, dev); }