hostap/src/p2p/p2p_invitation.c

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2010-07-18 23:30:25 +02:00
/*
* 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.
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*/
#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;
buf = wpabuf_alloc(1000);
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)
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p2p_buf_add_config_timeout(buf, 0, 0);
else
p2p_buf_add_config_timeout(buf, 100, 20);
p2p_buf_add_invitation_flags(buf, p2p->inv_persistent ?
P2P_INVITATION_FLAGS_TYPE : 0);
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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;
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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);
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p2p_buf_update_ie_hdr(buf, len);
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;
buf = wpabuf_alloc(1000);
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);
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)) {
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wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Invitation Request from unknown peer "
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MACSTR, MAC2STR(sa));
if (p2p_add_device(p2p, sa, rx_freq, 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;
}
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}
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) {
if (p2p_freq_to_channel(p2p->cfg->country, op_freq,
&reg_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 {
op_freq = p2p_channel_to_freq(p2p->cfg->country,
p2p->cfg->op_reg_class,
p2p->cfg->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->cfg->op_reg_class, p2p->cfg->op_channel);
status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
goto fail;
}
p2p_channels_intersect(&p2p->cfg->channels, &dev->channels,
&intersection);
if (status == P2P_SC_SUCCESS) {
reg_class = p2p->cfg->op_reg_class;
channel = p2p->cfg->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) {
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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));
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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);
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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) {
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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,
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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);
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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)) {
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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);
}