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nest-open-source / nest-learning-thermostat / 5.6.2 / hostap / f866bfa15e56f38c11516ec07321519c524fde11 / . / hostap / src / p2p / p2p_go_neg.c
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/*
* 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, 1);
}
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;
}
/**
* p2p_reselect_channel - Re-select operating channel based on peer information
* @p2p: P2P module context from p2p_init()
* @intersection: Support channel list intersection from local and peer
*
* This function is used to re-select the best channel after having received
* information from the peer to allow supported channel lists to be intersected.
* This can be used to improve initial channel selection done in
* p2p_prepare_channel() prior to the start of GO Negotiation. In addition, this
* can be used for Invitation case.
*/
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;
/* 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;
}
}
/* Try a channel where we might be able to use HT40 */
for (i = 0; i < intersection->reg_classes; i++) {
struct p2p_reg_class *c = &intersection->reg_class[i];
if (c->reg_class == 116 || c->reg_class == 117 ||
c->reg_class == 126 || c->reg_class == 127) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Pick possible HT40 channel (reg_class "
"%u channel %u) from intersection",
c->reg_class, c->channel[0]);
p2p->op_reg_class = c->reg_class;
p2p->op_channel = c->channel[0];
return;
}
}
/*
* Try to see if the original channel is in the intersection. If
* so, no need to change anything, as it already contains some
* randomness.
*/
if (p2p_channels_includes(intersection, p2p->op_reg_class,
p2p->op_channel)) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG,
"P2P: Using original operating class and channel "
"(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];
}
static int p2p_go_select_channel(struct p2p_data *p2p, struct p2p_device *dev,
u8 *status)
{
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");
return -1;
}
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)) {
if (dev->flags & P2P_DEV_FORCE_FREQ) {
*status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Peer does "
"not support the forced channel");
return -1;
}
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Selected operating "
"channel (op_class %u channel %u) not acceptable to "
"the peer", p2p->op_reg_class, p2p->op_channel);
p2p_reselect_channel(p2p, &intersection);
} else if (!(dev->flags & P2P_DEV_FORCE_FREQ) &&
!p2p->cfg->cfg_op_channel) {
wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Try to optimize "
"channel selection with peer information received; "
"previously selected op_class %u channel %u",
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;
}
return 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 && p2p_go_select_channel(p2p, dev, &status) < 0)
goto fail;
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 && p2p_go_select_channel(p2p, dev, &status) < 0)
goto fail;
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 */
}
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);
}