diff options
Diffstat (limited to 'contrib/wpa/src/p2p/p2p_invitation.c')
-rw-r--r-- | contrib/wpa/src/p2p/p2p_invitation.c | 608 |
1 files changed, 608 insertions, 0 deletions
diff --git a/contrib/wpa/src/p2p/p2p_invitation.c b/contrib/wpa/src/p2p/p2p_invitation.c new file mode 100644 index 0000000..983dd6b --- /dev/null +++ b/contrib/wpa/src/p2p/p2p_invitation.c @@ -0,0 +1,608 @@ +/* + * Wi-Fi Direct - P2P Invitation 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_invitation_req(struct p2p_data *p2p, + struct p2p_device *peer, + const u8 *go_dev_addr) +{ + struct wpabuf *buf; + u8 *len; + const u8 *dev_addr; + size_t extra = 0; + +#ifdef CONFIG_WIFI_DISPLAY + struct wpabuf *wfd_ie = p2p->wfd_ie_invitation; + if (wfd_ie && p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO) { + size_t i; + for (i = 0; i < p2p->num_groups; i++) { + struct p2p_group *g = p2p->groups[i]; + struct wpabuf *ie; + if (os_memcmp(p2p_group_get_interface_addr(g), + p2p->inv_bssid, ETH_ALEN) != 0) + continue; + ie = p2p_group_get_wfd_ie(g); + if (ie) { + wfd_ie = ie; + break; + } + } + } + if (wfd_ie) + extra = wpabuf_len(wfd_ie); +#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_INVITATION_REQ, + peer->dialog_token); + + len = p2p_buf_add_ie_hdr(buf); + if (p2p->inv_role == P2P_INVITE_ROLE_ACTIVE_GO || !p2p->inv_persistent) + p2p_buf_add_config_timeout(buf, 0, 0); + else + p2p_buf_add_config_timeout(buf, p2p->go_timeout, + p2p->client_timeout); + p2p_buf_add_invitation_flags(buf, p2p->inv_persistent ? + P2P_INVITATION_FLAGS_TYPE : 0); + p2p_buf_add_operating_channel(buf, p2p->cfg->country, + p2p->op_reg_class, p2p->op_channel); + if (p2p->inv_bssid_set) + p2p_buf_add_group_bssid(buf, p2p->inv_bssid); + p2p_buf_add_channel_list(buf, p2p->cfg->country, &p2p->channels); + if (go_dev_addr) + dev_addr = go_dev_addr; + else if (p2p->inv_role == P2P_INVITE_ROLE_CLIENT) + dev_addr = peer->info.p2p_device_addr; + else + dev_addr = p2p->cfg->dev_addr; + p2p_buf_add_group_id(buf, dev_addr, p2p->inv_ssid, p2p->inv_ssid_len); + p2p_buf_add_device_info(buf, p2p, peer); + p2p_buf_update_ie_hdr(buf, len); + +#ifdef CONFIG_WIFI_DISPLAY + if (wfd_ie) + wpabuf_put_buf(buf, wfd_ie); +#endif /* CONFIG_WIFI_DISPLAY */ + + return buf; +} + + +static struct wpabuf * p2p_build_invitation_resp(struct p2p_data *p2p, + struct p2p_device *peer, + u8 dialog_token, u8 status, + const u8 *group_bssid, + u8 reg_class, u8 channel, + struct p2p_channels *channels) +{ + struct wpabuf *buf; + u8 *len; + size_t extra = 0; + +#ifdef CONFIG_WIFI_DISPLAY + struct wpabuf *wfd_ie = p2p->wfd_ie_invitation; + if (wfd_ie && group_bssid) { + size_t i; + for (i = 0; i < p2p->num_groups; i++) { + struct p2p_group *g = p2p->groups[i]; + struct wpabuf *ie; + if (os_memcmp(p2p_group_get_interface_addr(g), + group_bssid, ETH_ALEN) != 0) + continue; + ie = p2p_group_get_wfd_ie(g); + if (ie) { + wfd_ie = ie; + break; + } + } + } + if (wfd_ie) + extra = wpabuf_len(wfd_ie); +#endif /* CONFIG_WIFI_DISPLAY */ + + buf = wpabuf_alloc(1000 + extra); + if (buf == NULL) + return NULL; + + p2p_buf_add_public_action_hdr(buf, P2P_INVITATION_RESP, + dialog_token); + + len = p2p_buf_add_ie_hdr(buf); + p2p_buf_add_status(buf, status); + p2p_buf_add_config_timeout(buf, 0, 0); /* FIX */ + if (reg_class && channel) + p2p_buf_add_operating_channel(buf, p2p->cfg->country, + reg_class, channel); + if (group_bssid) + p2p_buf_add_group_bssid(buf, group_bssid); + if (channels) + p2p_buf_add_channel_list(buf, p2p->cfg->country, channels); + p2p_buf_update_ie_hdr(buf, len); + +#ifdef CONFIG_WIFI_DISPLAY + if (wfd_ie) + wpabuf_put_buf(buf, wfd_ie); +#endif /* CONFIG_WIFI_DISPLAY */ + + return buf; +} + + +void p2p_process_invitation_req(struct p2p_data *p2p, const u8 *sa, + const u8 *data, size_t len, int rx_freq) +{ + struct p2p_device *dev; + struct p2p_message msg; + struct wpabuf *resp = NULL; + u8 status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; + int freq; + int go = 0; + u8 group_bssid[ETH_ALEN], *bssid; + int op_freq = 0; + u8 reg_class = 0, channel = 0; + struct p2p_channels intersection, *channels = NULL; + int persistent; + + os_memset(group_bssid, 0, sizeof(group_bssid)); + + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Received Invitation Request from " MACSTR " (freq=%d)", + MAC2STR(sa), rx_freq); + + if (p2p_parse(data, len, &msg)) + return; + + dev = p2p_get_device(p2p, sa); + if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Invitation Request from unknown peer " + MACSTR, MAC2STR(sa)); + + if (p2p_add_device(p2p, sa, rx_freq, 0, 0, data + 1, len - 1, + 0)) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Invitation Request add device failed " + MACSTR, MAC2STR(sa)); + status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; + goto fail; + } + + dev = p2p_get_device(p2p, sa); + if (dev == NULL) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Reject Invitation Request from unknown " + "peer " MACSTR, MAC2STR(sa)); + status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE; + goto fail; + } + } + + if (!msg.group_id || !msg.channel_list) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Mandatory attribute missing in Invitation " + "Request from " MACSTR, MAC2STR(sa)); + status = P2P_SC_FAIL_INVALID_PARAMS; + goto fail; + } + + if (msg.invitation_flags) + persistent = *msg.invitation_flags & P2P_INVITATION_FLAGS_TYPE; + else { + /* Invitation Flags is a mandatory attribute starting from P2P + * spec 1.06. As a backwards compatibility mechanism, assume + * the request was for a persistent group if the attribute is + * missing. + */ + wpa_printf(MSG_DEBUG, "P2P: Mandatory Invitation Flags " + "attribute missing from Invitation Request"); + persistent = 1; + } + + if (p2p_peer_channels_check(p2p, &p2p->cfg->channels, 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 (p2p->cfg->invitation_process) { + status = p2p->cfg->invitation_process( + p2p->cfg->cb_ctx, sa, msg.group_bssid, msg.group_id, + msg.group_id + ETH_ALEN, msg.group_id_len - ETH_ALEN, + &go, group_bssid, &op_freq, persistent); + } + + if (op_freq) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Invitation " + "processing forced frequency %d MHz", op_freq); + if (p2p_freq_to_channel(p2p->cfg->country, op_freq, + ®_class, &channel) < 0) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Unknown forced freq %d MHz from " + "invitation_process()", op_freq); + status = P2P_SC_FAIL_NO_COMMON_CHANNELS; + goto fail; + } + + p2p_channels_intersect(&p2p->cfg->channels, &dev->channels, + &intersection); + if (!p2p_channels_includes(&intersection, reg_class, channel)) + { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: forced freq %d MHz not in the supported " + "channels interaction", op_freq); + status = P2P_SC_FAIL_NO_COMMON_CHANNELS; + goto fail; + } + + if (status == P2P_SC_SUCCESS) + channels = &intersection; + } else { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: No forced channel from invitation processing - " + "figure out best one to use"); + + p2p_channels_intersect(&p2p->cfg->channels, &dev->channels, + &intersection); + /* Default to own configuration as a starting point */ + p2p->op_reg_class = p2p->cfg->op_reg_class; + p2p->op_channel = p2p->cfg->op_channel; + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Own default " + "op_class %d channel %d", + p2p->op_reg_class, p2p->op_channel); + + /* Use peer preference if specified and compatible */ + if (msg.operating_channel) { + int req_freq; + req_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", + req_freq); + if (req_freq > 0 && + p2p_channels_includes(&intersection, + msg.operating_channel[3], + msg.operating_channel[4])) { + p2p->op_reg_class = msg.operating_channel[3]; + p2p->op_channel = msg.operating_channel[4]; + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Use peer preference op_class %d " + "channel %d", + p2p->op_reg_class, p2p->op_channel); + } else { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Cannot use peer channel " + "preference"); + } + } + + if (!p2p_channels_includes(&intersection, p2p->op_reg_class, + p2p->op_channel)) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Initially selected channel (op_class %d " + "channel %d) not in channel intersection - try " + "to reselect", + p2p->op_reg_class, p2p->op_channel); + p2p_reselect_channel(p2p, &intersection); + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Re-selection result: op_class %d " + "channel %d", + p2p->op_reg_class, p2p->op_channel); + if (!p2p_channels_includes(&intersection, + p2p->op_reg_class, + p2p->op_channel)) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Peer does not support selected " + "operating channel (reg_class=%u " + "channel=%u)", + p2p->op_reg_class, p2p->op_channel); + status = P2P_SC_FAIL_NO_COMMON_CHANNELS; + goto fail; + } + } + + op_freq = p2p_channel_to_freq(p2p->cfg->country, + p2p->op_reg_class, + p2p->op_channel); + if (op_freq < 0) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Unknown operational channel " + "(country=%c%c reg_class=%u channel=%u)", + p2p->cfg->country[0], p2p->cfg->country[1], + p2p->op_reg_class, p2p->op_channel); + status = P2P_SC_FAIL_NO_COMMON_CHANNELS; + goto fail; + } + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Selected operating " + "channel - %d MHz", op_freq); + + if (status == P2P_SC_SUCCESS) { + reg_class = p2p->op_reg_class; + channel = p2p->op_channel; + channels = &intersection; + } + } + +fail: + if (go && status == P2P_SC_SUCCESS && !is_zero_ether_addr(group_bssid)) + bssid = group_bssid; + else + bssid = NULL; + resp = p2p_build_invitation_resp(p2p, dev, msg.dialog_token, status, + bssid, reg_class, channel, channels); + + if (resp == NULL) + goto out; + + 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"); + goto out; + } + + /* + * Store copy of invitation data to be used when processing TX status + * callback for the Acton frame. + */ + os_memcpy(p2p->inv_sa, sa, ETH_ALEN); + if (msg.group_bssid) { + os_memcpy(p2p->inv_group_bssid, msg.group_bssid, ETH_ALEN); + p2p->inv_group_bssid_ptr = p2p->inv_group_bssid; + } else + p2p->inv_group_bssid_ptr = NULL; + if (msg.group_id_len - ETH_ALEN <= 32) { + os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN, + msg.group_id_len - ETH_ALEN); + p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN; + } + os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN); + p2p->inv_status = status; + p2p->inv_op_freq = op_freq; + + p2p->pending_action_state = P2P_PENDING_INVITATION_RESPONSE; + if (p2p_send_action(p2p, 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"); + } + +out: + wpabuf_free(resp); + p2p_parse_free(&msg); +} + + +void p2p_process_invitation_resp(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 Invitation Response from " MACSTR, + MAC2STR(sa)); + + dev = p2p_get_device(p2p, sa); + if (dev == NULL) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Ignore Invitation Response from unknown peer " + MACSTR, MAC2STR(sa)); + return; + } + + if (dev != p2p->invite_peer) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Ignore unexpected Invitation Response from peer " + MACSTR, MAC2STR(sa)); + return; + } + + if (p2p_parse(data, len, &msg)) + return; + + if (!msg.status) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Mandatory Status attribute missing in " + "Invitation Response from " MACSTR, MAC2STR(sa)); + p2p_parse_free(&msg); + return; + } + + if (p2p->cfg->invitation_result) + p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status, + msg.group_bssid); + + p2p_parse_free(&msg); + + p2p_clear_timeout(p2p); + p2p_set_state(p2p, P2P_IDLE); + p2p->invite_peer = NULL; +} + + +int p2p_invite_send(struct p2p_data *p2p, struct p2p_device *dev, + const u8 *go_dev_addr) +{ + struct wpabuf *req; + int freq; + + 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 Invitation Request", + MAC2STR(dev->info.p2p_device_addr)); + return -1; + } + + req = p2p_build_invitation_req(p2p, dev, go_dev_addr); + if (req == NULL) + return -1; + if (p2p->state != P2P_IDLE) + p2p_stop_listen_for_freq(p2p, freq); + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Sending Invitation Request"); + p2p_set_state(p2p, P2P_INVITE); + p2p->pending_action_state = P2P_PENDING_INVITATION_REQUEST; + p2p->invite_peer = dev; + dev->invitation_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); + } + + wpabuf_free(req); + + return 0; +} + + +void p2p_invitation_req_cb(struct p2p_data *p2p, int success) +{ + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Invitation Request TX callback: success=%d", success); + + if (p2p->invite_peer == NULL) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: No pending Invite"); + return; + } + + /* + * Use P2P find, if needed, to find the other device from its listen + * channel. + */ + p2p_set_state(p2p, P2P_INVITE); + p2p_set_timeout(p2p, 0, 100000); +} + + +void p2p_invitation_resp_cb(struct p2p_data *p2p, int success) +{ + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Invitation Response TX callback: success=%d", success); + p2p->cfg->send_action_done(p2p->cfg->cb_ctx); + + if (success && p2p->cfg->invitation_received) { + p2p->cfg->invitation_received(p2p->cfg->cb_ctx, + p2p->inv_sa, + p2p->inv_group_bssid_ptr, + p2p->inv_ssid, p2p->inv_ssid_len, + p2p->inv_go_dev_addr, + p2p->inv_status, + p2p->inv_op_freq); + } +} + + +int p2p_invite(struct p2p_data *p2p, const u8 *peer, enum p2p_invite_role role, + const u8 *bssid, const u8 *ssid, size_t ssid_len, + unsigned int force_freq, const u8 *go_dev_addr, + int persistent_group) +{ + struct p2p_device *dev; + + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Request to invite peer " MACSTR " role=%d persistent=%d " + "force_freq=%u", + MAC2STR(peer), role, persistent_group, force_freq); + if (bssid) + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Invitation for BSSID " MACSTR, MAC2STR(bssid)); + if (go_dev_addr) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Invitation for GO Device Address " MACSTR, + MAC2STR(go_dev_addr)); + os_memcpy(p2p->invite_go_dev_addr_buf, go_dev_addr, ETH_ALEN); + p2p->invite_go_dev_addr = p2p->invite_go_dev_addr_buf; + } else + p2p->invite_go_dev_addr = NULL; + wpa_hexdump_ascii(MSG_DEBUG, "P2P: Invitation for SSID", + ssid, ssid_len); + + dev = p2p_get_device(p2p, peer); + if (dev == NULL || (dev->listen_freq <= 0 && dev->oper_freq <= 0)) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Cannot invite unknown P2P Device " MACSTR, + MAC2STR(peer)); + return -1; + } + + if (dev->flags & P2P_DEV_GROUP_CLIENT_ONLY) { + if (!(dev->info.dev_capab & + P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY)) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Cannot invite a P2P Device " MACSTR + " that is in a group and is not discoverable", + MAC2STR(peer)); + } + /* TODO: use device discoverability request through GO */ + } + + dev->invitation_reqs = 0; + + if (force_freq) { + if (p2p_freq_to_channel(p2p->cfg->country, force_freq, + &p2p->op_reg_class, &p2p->op_channel) < + 0) { + wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, + "P2P: Unsupported frequency %u MHz", + force_freq); + return -1; + } + p2p->channels.reg_classes = 1; + p2p->channels.reg_class[0].channels = 1; + p2p->channels.reg_class[0].reg_class = p2p->op_reg_class; + p2p->channels.reg_class[0].channel[0] = p2p->op_channel; + } else { + 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)); + } + + if (p2p->state != P2P_IDLE) + p2p_stop_find(p2p); + + p2p->inv_role = role; + p2p->inv_bssid_set = bssid != NULL; + if (bssid) + os_memcpy(p2p->inv_bssid, bssid, ETH_ALEN); + os_memcpy(p2p->inv_ssid, ssid, ssid_len); + p2p->inv_ssid_len = ssid_len; + p2p->inv_persistent = persistent_group; + return p2p_invite_send(p2p, dev, go_dev_addr); +} |