/*
* 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 "utils/eloop.h"
#include "common/ieee802_11_defs.h"
#include "common/wpa_ctrl.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;
u8 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) {
p2p_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 (end - pos > 2) {
struct p2p_reg_class *cl = &ch->reg_class[ch->reg_classes];
cl->reg_class = *pos++;
channels = *pos++;
if (channels > end - pos) {
p2p_info(p2p, "Invalid peer Channel List");
return -1;
}
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);
p2p_dbg(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) {
p2p_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;
case WPS_NFC:
return DEV_PW_NFC_CONNECTION_HANDOVER;
case WPS_P2PS:
return DEV_PW_P2PS_DEFAULT;
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";
case WPS_NFC:
return "NFC";
case WPS_P2PS:
return "P2PS";
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;
u16 pw_id;
#ifdef CONFIG_WIFI_DISPLAY
if (p2p->wfd_ie_go_neg)
extra = wpabuf_len(p2p->wfd_ie_go_neg);
#endif /* CONFIG_WIFI_DISPLAY */
if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ])
extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]);
buf = wpabuf_alloc(1000 + extra);
if (buf == NULL)
return NULL;
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) | peer->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);
p2p_buf_add_pref_channel_list(buf, p2p->pref_freq_list,
p2p->num_pref_freq);
/* WPS IE with Device Password ID attribute */
pw_id = p2p_wps_method_pw_id(peer->wps_method);
if (peer->oob_pw_id)
pw_id = peer->oob_pw_id;
if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) {
p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Request");
wpabuf_free(buf);
return NULL;
}
#ifdef CONFIG_WIFI_DISPLAY
if (p2p->wfd_ie_go_neg)
wpabuf_put_buf(buf, p2p->wfd_ie_go_neg);
#endif /* CONFIG_WIFI_DISPLAY */
if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ])
wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_REQ]);
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;
p2p_dbg(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 if (dev->wps_method == WPS_P2PS)
config_method = WPS_CONFIG_P2PS;
else
return -1;
return p2p_prov_disc_req(p2p, dev->info.p2p_device_addr,
NULL, config_method, 0, 0, 1);
}
freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq;
if (dev->oob_go_neg_freq > 0)
freq = dev->oob_go_neg_freq;
if (freq <= 0) {
p2p_dbg(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;
p2p_dbg(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;
eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL);
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), 500) < 0) {
p2p_dbg(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;
u16 pw_id;
p2p_dbg(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 */
if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP])
extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]);
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 (p2p->override_pref_op_class) {
p2p_dbg(p2p, "Override operating channel preference");
p2p_buf_add_operating_channel(buf, p2p->cfg->country,
p2p->override_pref_op_class,
p2p->override_pref_channel);
} else if (peer && peer->go_state == REMOTE_GO && !p2p->num_pref_freq) {
p2p_dbg(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 */
pw_id = p2p_wps_method_pw_id(peer ? peer->wps_method : WPS_NOT_READY);
if (peer && peer->oob_pw_id)
pw_id = peer->oob_pw_id;
if (p2p_build_wps_ie(p2p, buf, pw_id, 0) < 0) {
p2p_dbg(p2p, "Failed to build WPS IE for GO Negotiation Response");
wpabuf_free(buf);
return NULL;
}
#ifdef CONFIG_WIFI_DISPLAY
if (p2p->wfd_ie_go_neg)
wpabuf_put_buf(buf, p2p->wfd_ie_go_neg);
#endif /* CONFIG_WIFI_DISPLAY */
if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP])
wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_RESP]);
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;
const int op_classes_5ghz[] = { 124, 125, 115, 0 };
const int op_classes_ht40[] = { 126, 127, 116, 117, 0 };
const int op_classes_vht[] = { 128, 129, 130, 0 };
if (p2p->own_freq_preference > 0 &&
p2p_freq_to_channel(p2p->own_freq_preference,
&op_reg_class, &op_channel) == 0 &&
p2p_channels_includes(intersection, op_reg_class, op_channel)) {
p2p_dbg(p2p, "Pick own channel preference (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 (p2p->best_freq_overall > 0 &&
p2p_freq_to_channel(p2p->best_freq_overall,
&op_reg_class, &op_channel) == 0 &&
p2p_channels_includes(intersection, op_reg_class, op_channel)) {
p2p_dbg(p2p, "Pick best overall 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;
}
/* First, try to pick the best channel from another band */
freq = p2p_channel_to_freq(p2p->op_reg_class, p2p->op_channel);
if (freq >= 2400 && freq < 2500 && p2p->best_freq_5 > 0 &&
!p2p_channels_includes(intersection, p2p->op_reg_class,
p2p->op_channel) &&
p2p_freq_to_channel(p2p->best_freq_5,
&op_reg_class, &op_channel) == 0 &&
p2p_channels_includes(intersection, op_reg_class, op_channel)) {
p2p_dbg(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_channels_includes(intersection, p2p->op_reg_class,
p2p->op_channel) &&
p2p_freq_to_channel(p2p->best_freq_24,
&op_reg_class, &op_channel) == 0 &&
p2p_channels_includes(intersection, op_reg_class, op_channel)) {
p2p_dbg(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;
p2p_dbg(p2p, "Pick highest preferred channel (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 VHT */
if (p2p_channel_select(intersection, op_classes_vht,
&p2p->op_reg_class, &p2p->op_channel) == 0) {
p2p_dbg(p2p, "Pick possible VHT channel (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 */
if (p2p_channel_select(intersection, op_classes_ht40,
&p2p->op_reg_class, &p2p->op_channel) == 0) {
p2p_dbg(p2p, "Pick possible HT40 channel (op_class %u channel %u) from intersection",
p2p->op_reg_class, p2p->op_channel);
return;
}
/* Prefer a 5 GHz channel */
if (p2p_channel_select(intersection, op_classes_5ghz,
&p2p->op_reg_class, &p2p->op_channel) == 0) {
p2p_dbg(p2p, "Pick possible 5 GHz channel (op_class %u channel %u) from intersection",
p2p->op_reg_class, p2p->op_channel);
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)) {
p2p_dbg(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];
p2p_dbg(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];
}
int p2p_go_select_channel(struct p2p_data *p2p, struct p2p_device *dev,
u8 *status)
{
struct p2p_channels tmp, intersection;
p2p_channels_dump(p2p, "own channels", &p2p->channels);
p2p_channels_dump(p2p, "peer channels", &dev->channels);
p2p_channels_intersect(&p2p->channels, &dev->channels, &tmp);
p2p_channels_dump(p2p, "intersection", &tmp);
p2p_channels_remove_freqs(&tmp, &p2p->no_go_freq);
p2p_channels_dump(p2p, "intersection after no-GO removal", &tmp);
p2p_channels_intersect(&tmp, &p2p->cfg->channels, &intersection);
p2p_channels_dump(p2p, "intersection with local channel list",
&intersection);
if (intersection.reg_classes == 0 ||
intersection.reg_class[0].channels == 0) {
*status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
p2p_dbg(p2p, "No common channels found");
return -1;
}
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;
p2p_dbg(p2p, "Peer does not support the forced channel");
return -1;
}
p2p_dbg(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) {
p2p_dbg(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;
}
static void p2p_check_pref_chan_no_recv(struct p2p_data *p2p, int go,
struct p2p_device *dev,
struct p2p_message *msg,
unsigned freq_list[], unsigned int size)
{
u8 op_class, op_channel;
unsigned int oper_freq = 0, i, j;
int found = 0;
p2p_dbg(p2p,
"Peer didn't provide a preferred frequency list, see if any of our preferred channels are supported by peer device");
/*
* Search for a common channel in our preferred frequency list which is
* also supported by the peer device.
*/
for (i = 0; i < size && !found; i++) {
/* Make sure that the common frequency is supported by peer. */
oper_freq = freq_list[i];
if (p2p_freq_to_channel(oper_freq, &op_class,
&op_channel) < 0)
continue; /* cannot happen due to earlier check */
for (j = 0; j < msg->channel_list_len; j++) {
if (op_channel != msg->channel_list[j])
continue;
p2p->op_reg_class = op_class;
p2p->op_channel = op_channel;
os_memcpy(&p2p->channels, &p2p->cfg->channels,
sizeof(struct p2p_channels));
found = 1;
break;
}
}
if (found) {
p2p_dbg(p2p,
"Freq %d MHz is a preferred channel and is also supported by peer, use it as the operating channel",
oper_freq);
} else {
p2p_dbg(p2p,
"None of our preferred channels are supported by peer!");
}
}
static void p2p_check_pref_chan_recv(struct p2p_data *p2p, int go,
struct p2p_device *dev,
struct p2p_message *msg,
unsigned freq_list[], unsigned int size)
{
u8 op_class, op_channel;
unsigned int oper_freq = 0, i, j;
int found = 0;
/*
* Peer device supports a Preferred Frequency List.
* Search for a common channel in the preferred frequency lists
* of both peer and local devices.
*/
for (i = 0; i < size && !found; i++) {
for (j = 2; j < (msg->pref_freq_list_len / 2); j++) {
oper_freq = p2p_channel_to_freq(
msg->pref_freq_list[2 * j],
msg->pref_freq_list[2 * j + 1]);
if (freq_list[i] != oper_freq)
continue;
if (p2p_freq_to_channel(oper_freq, &op_class,
&op_channel) < 0)
continue; /* cannot happen */
p2p->op_reg_class = op_class;
p2p->op_channel = op_channel;
os_memcpy(&p2p->channels, &p2p->cfg->channels,
sizeof(struct p2p_channels));
found = 1;
break;
}
}
if (found) {
p2p_dbg(p2p,
"Freq %d MHz is a common preferred channel for both peer and local, use it as operating channel",
oper_freq);
} else {
p2p_dbg(p2p, "No common preferred channels found!");
}
}
void p2p_check_pref_chan(struct p2p_data *p2p, int go,
struct p2p_device *dev, struct p2p_message *msg)
{
unsigned int freq_list[P2P_MAX_PREF_CHANNELS], size;
unsigned int i;
u8 op_class, op_channel;
char txt[100], *pos, *end;
int res;
/*
* Use the preferred channel list from the driver only if there is no
* forced_freq, e.g., P2P_CONNECT freq=..., and no preferred operating
* channel hardcoded in the configuration file.
*/
if (!p2p->cfg->get_pref_freq_list || p2p->cfg->num_pref_chan ||
(dev->flags & P2P_DEV_FORCE_FREQ) || p2p->cfg->cfg_op_channel)
return;
/* Obtain our preferred frequency list from driver based on P2P role. */
size = P2P_MAX_PREF_CHANNELS;
if (p2p->cfg->get_pref_freq_list(p2p->cfg->cb_ctx, go, &size,
freq_list))
return;
/* Filter out frequencies that are not acceptable for P2P use */
i = 0;
while (i < size) {
if (p2p_freq_to_channel(freq_list[i], &op_class,
&op_channel) < 0 ||
(!p2p_channels_includes(&p2p->cfg->channels,
op_class, op_channel) &&
(go || !p2p_channels_includes(&p2p->cfg->cli_channels,
op_class, op_channel)))) {
p2p_dbg(p2p,
"Ignore local driver frequency preference %u MHz since it is not acceptable for P2P use (go=%d)",
freq_list[i], go);
if (size - i - 1 > 0)
os_memmove(&freq_list[i], &freq_list[i + 1], size - i - 1);
size--;
continue;
}
/* Preferred frequency is acceptable for P2P use */
i++;
}
pos = txt;
end = pos + sizeof(txt);
for (i = 0; i < size; i++) {
res = os_snprintf(pos, end - pos, " %u", freq_list[i]);
if (os_snprintf_error(end - pos, res))
break;
pos += res;
}
*pos = '\0';
p2p_dbg(p2p, "Local driver frequency preference (size=%u):%s",
size, txt);
/*
* Check if peer's preference of operating channel is in
* our preferred channel list.
*/
for (i = 0; i < size; i++) {
if (freq_list[i] == (unsigned int) dev->oper_freq)
break;
}
if (i != size &&
p2p_freq_to_channel(freq_list[i], &op_class, &op_channel) == 0) {
/* Peer operating channel preference matches our preference */
p2p->op_reg_class = op_class;
p2p->op_channel = op_channel;
os_memcpy(&p2p->channels, &p2p->cfg->channels,
sizeof(struct p2p_channels));
return;
}
p2p_dbg(p2p,
"Peer operating channel preference: %d MHz is not in our preferred channel list",
dev->oper_freq);
/*
Check if peer's preferred channel list is
* _not_ included in the GO Negotiation Request or Invitation Request.
*/
if (msg->pref_freq_list_len == 0)
p2p_check_pref_chan_no_recv(p2p, go, dev, msg, freq_list, size);
else
p2p_check_pref_chan_recv(p2p, go, dev, msg, freq_list, size);
}
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;
p2p_dbg(p2p, "Received GO Negotiation Request from " MACSTR "(freq=%d)",
MAC2STR(sa), rx_freq);
if (p2p_parse(data, len, &msg))
return;
if (!msg.capability) {
p2p_dbg(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 {
p2p_dbg(p2p, "Mandatory GO Intent attribute missing from GO Negotiation Request");
#ifdef CONFIG_P2P_STRICT
goto fail;
#endif /* CONFIG_P2P_STRICT */
}
if (!msg.config_timeout) {
p2p_dbg(p2p, "Mandatory Configuration Timeout attribute missing from GO Negotiation Request");
#ifdef CONFIG_P2P_STRICT
goto fail;
#endif /* CONFIG_P2P_STRICT */
}
if (!msg.listen_channel) {
p2p_dbg(p2p, "No Listen Channel attribute received");
goto fail;
}
if (!msg.operating_channel) {
p2p_dbg(p2p, "No Operating Channel attribute received");
goto fail;
}
if (!msg.channel_list) {
p2p_dbg(p2p, "No Channel List attribute received");
goto fail;
}
if (!msg.intended_addr) {
p2p_dbg(p2p, "No Intended P2P Interface Address attribute received");
goto fail;
}
if (!msg.p2p_device_info) {
p2p_dbg(p2p, "No P2P Device Info attribute received");
goto fail;
}
if (os_memcmp(msg.p2p_device_addr, sa, ETH_ALEN) != 0) {
p2p_dbg(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) {
p2p_dbg(p2p, "Unexpected Status attribute (%d) in GO Negotiation Request",
*msg.status);
if (dev && p2p->go_neg_peer == dev &&
*msg.status == P2P_SC_FAIL_REJECTED_BY_USER) {
/*
* This mechanism for using Status attribute in GO
* Negotiation Request is not compliant with the P2P
* specification, but some deployed devices use it to
* indicate rejection of GO Negotiation in a case where
* they have sent out GO Negotiation Response with
* status 1. The P2P specification explicitly disallows
* this. To avoid unnecessary interoperability issues
* and extra frames, mark the pending negotiation as
* failed and do not reply to this GO Negotiation
* Request frame.
*/
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
p2p_go_neg_failed(p2p, *msg.status);
p2p_parse_free(&msg);
return;
}
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) ||
!(dev->flags & P2P_DEV_REPORTED))
p2p_add_dev_info(p2p, sa, dev, &msg);
else if (!dev->listen_freq && !dev->oper_freq) {
/*
* This may happen if the peer entry was added based on PD
* Request and no Probe Request/Response frame has been received
* from this peer (or that information has timed out).
*/
p2p_dbg(p2p, "Update peer " MACSTR
" based on GO Neg Req since listen/oper freq not known",
MAC2STR(dev->info.p2p_device_addr));
p2p_add_dev_info(p2p, sa, dev, &msg);
}
if (p2p->go_neg_peer && p2p->go_neg_peer == dev)
eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL);
if (dev && dev->flags & P2P_DEV_USER_REJECTED) {
p2p_dbg(p2p, "User has rejected this peer");
status = P2P_SC_FAIL_REJECTED_BY_USER;
} else if (dev == NULL ||
(dev->wps_method == WPS_NOT_READY &&
(p2p->authorized_oob_dev_pw_id == 0 ||
p2p->authorized_oob_dev_pw_id !=
msg.dev_password_id))) {
p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR,
MAC2STR(sa));
status = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
p2p->cfg->go_neg_req_rx(p2p->cfg->cb_ctx, sa,
msg.dev_password_id,
msg.go_intent ? (*msg.go_intent >> 1) :
0);
} else if (p2p->go_neg_peer && p2p->go_neg_peer != dev) {
p2p_dbg(p2p, "Already in Group Formation with another peer");
status = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
} else {
int go;
if (!p2p->go_neg_peer) {
p2p_dbg(p2p, "Starting GO Negotiation with previously authorized peer");
if (!(dev->flags & P2P_DEV_FORCE_FREQ)) {
p2p_dbg(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 {
p2p_dbg(p2p, "Use previously configured forced channel settings");
}
}
dev->flags &= ~P2P_DEV_NOT_YET_READY;
if (!msg.go_intent) {
p2p_dbg(p2p, "No GO Intent attribute received");
goto fail;
}
if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) {
p2p_dbg(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) {
p2p_dbg(p2p, "Do not reply since peer has higher address and GO Neg Request already sent");
p2p_parse_free(&msg);
return;
}
if (dev->go_neg_req_sent &&
(dev->flags & P2P_DEV_PEER_WAITING_RESPONSE)) {
p2p_dbg(p2p,
"Do not reply since peer is waiting for us to start a new GO Negotiation and GO Neg Request already sent");
p2p_parse_free(&msg);
return;
}
go = p2p_go_det(p2p->go_intent, *msg.go_intent);
if (go < 0) {
p2p_dbg(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) {
p2p_dbg(p2p, "No common channels found");
status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
goto fail;
}
switch (msg.dev_password_id) {
case DEV_PW_REGISTRAR_SPECIFIED:
p2p_dbg(p2p, "PIN from peer Display");
if (dev->wps_method != WPS_PIN_KEYPAD) {
p2p_dbg(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:
p2p_dbg(p2p, "Peer entered PIN on Keypad");
if (dev->wps_method != WPS_PIN_DISPLAY) {
p2p_dbg(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:
p2p_dbg(p2p, "Peer using pushbutton");
if (dev->wps_method != WPS_PBC) {
p2p_dbg(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_P2PS_DEFAULT:
p2p_dbg(p2p, "Peer using P2PS pin");
if (dev->wps_method != WPS_P2PS) {
p2p_dbg(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:
if (msg.dev_password_id &&
msg.dev_password_id == dev->oob_pw_id) {
p2p_dbg(p2p, "Peer using NFC");
if (dev->wps_method != WPS_NFC) {
p2p_dbg(p2p, "We have wps_method=%s -> incompatible",
p2p_wps_method_str(
dev->wps_method));
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
goto fail;
}
break;
}
#ifdef CONFIG_WPS_NFC
if (p2p->authorized_oob_dev_pw_id &&
msg.dev_password_id ==
p2p->authorized_oob_dev_pw_id) {
p2p_dbg(p2p, "Using static handover with our device password from NFC Tag");
dev->wps_method = WPS_NFC;
dev->oob_pw_id = p2p->authorized_oob_dev_pw_id;
break;
}
#endif /* CONFIG_WPS_NFC */
p2p_dbg(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(msg.operating_channel[3],
msg.operating_channel[4]);
p2p_dbg(p2p, "Peer operating channel preference: %d MHz",
dev->oper_freq);
/*
* Use the driver preferred frequency list extension if
* supported.
*/
p2p_check_pref_chan(p2p, go, dev, &msg);
if (msg.config_timeout) {
dev->go_timeout = msg.config_timeout[0];
dev->client_timeout = msg.config_timeout[1];
}
p2p_dbg(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;
eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p, NULL);
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;
p2p_dbg(p2p, "Sending GO Negotiation Response");
if (rx_freq > 0)
freq = rx_freq;
else
freq = p2p_channel_to_freq(p2p->cfg->reg_class,
p2p->cfg->channel);
if (freq < 0) {
p2p_dbg(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), 100) < 0) {
p2p_dbg(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;
p2p_dbg(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 */
if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF])
extra += wpabuf_len(p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]);
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 */
if (p2p->vendor_elem && p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF])
wpabuf_put_buf(buf, p2p->vendor_elem[VENDOR_ELEM_P2P_GO_NEG_CONF]);
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;
int go = -1;
struct p2p_message msg;
u8 status = P2P_SC_SUCCESS;
int freq;
p2p_dbg(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) {
p2p_dbg(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)) {
p2p_dbg(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) {
p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)",
msg.dialog_token, dev->dialog_token);
p2p_parse_free(&msg);
return;
}
if (!msg.status) {
p2p_dbg(p2p, "No Status attribute received");
status = P2P_SC_FAIL_INVALID_PARAMS;
goto fail;
}
if (*msg.status) {
p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status);
dev->go_neg_req_sent = 0;
if (*msg.status == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) {
p2p_dbg(p2p, "Wait for the peer to become ready for GO Negotiation");
dev->flags |= P2P_DEV_NOT_YET_READY;
eloop_cancel_timeout(p2p_go_neg_wait_timeout, p2p,
NULL);
eloop_register_timeout(120, 0, p2p_go_neg_wait_timeout,
p2p, NULL);
if (p2p->state == P2P_CONNECT_LISTEN)
p2p_set_state(p2p, P2P_WAIT_PEER_CONNECT);
else
p2p_set_state(p2p, P2P_WAIT_PEER_IDLE);
p2p_set_timeout(p2p, 0, 0);
} else {
p2p_dbg(p2p, "Stop GO Negotiation attempt");
p2p_go_neg_failed(p2p, *msg.status);
}
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
p2p_parse_free(&msg);
return;
}
if (!msg.capability) {
p2p_dbg(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) {
p2p_dbg(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) {
p2p_dbg(p2p, "No Intended P2P Interface Address attribute received");
status = P2P_SC_FAIL_INVALID_PARAMS;
goto fail;
}
if (!msg.go_intent) {
p2p_dbg(p2p, "No GO Intent attribute received");
status = P2P_SC_FAIL_INVALID_PARAMS;
goto fail;
}
if ((*msg.go_intent >> 1) > P2P_MAX_GO_INTENT) {
p2p_dbg(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) {
p2p_dbg(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) {
p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Response");
p2p->ssid_len = 0;
status = P2P_SC_FAIL_INVALID_PARAMS;
goto fail;
}
if (!msg.config_timeout) {
p2p_dbg(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.wfd_subelems) {
wpabuf_free(dev->info.wfd_subelems);
dev->info.wfd_subelems = wpabuf_dup(msg.wfd_subelems);
}
if (!msg.operating_channel && !go) {
/*
* Note: P2P Client may omit Operating Channel attribute to
* indicate it does not have a preference.
*/
p2p_dbg(p2p, "No Operating Channel attribute received");
status = P2P_SC_FAIL_INVALID_PARAMS;
goto fail;
}
if (!msg.channel_list) {
p2p_dbg(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) {
p2p_dbg(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(msg.operating_channel[3],
msg.operating_channel[4]);
p2p_dbg(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:
p2p_dbg(p2p, "PIN from peer Display");
if (dev->wps_method != WPS_PIN_KEYPAD) {
p2p_dbg(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:
p2p_dbg(p2p, "Peer entered PIN on Keypad");
if (dev->wps_method != WPS_PIN_DISPLAY) {
p2p_dbg(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:
p2p_dbg(p2p, "Peer using pushbutton");
if (dev->wps_method != WPS_PBC) {
p2p_dbg(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_P2PS_DEFAULT:
p2p_dbg(p2p, "P2P: Peer using P2PS default pin");
if (dev->wps_method != WPS_P2PS) {
p2p_dbg(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:
if (msg.dev_password_id &&
msg.dev_password_id == dev->oob_pw_id) {
p2p_dbg(p2p, "Peer using NFC");
if (dev->wps_method != WPS_NFC) {
p2p_dbg(p2p, "We have wps_method=%s -> incompatible",
p2p_wps_method_str(dev->wps_method));
status = P2P_SC_FAIL_INCOMPATIBLE_PROV_METHOD;
goto fail;
}
break;
}
p2p_dbg(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;
/*
* Use the driver preferred frequency list extension if local device is
* GO.
*/
if (go)
p2p_check_pref_chan(p2p, go, dev, &msg);
p2p_set_state(p2p, P2P_GO_NEG);
p2p_clear_timeout(p2p);
p2p_dbg(p2p, "GO Negotiation with " MACSTR, MAC2STR(sa));
os_memcpy(dev->intended_addr, msg.intended_addr, ETH_ALEN);
fail:
/* Store GO Negotiation Confirmation to allow retransmission */
wpabuf_free(dev->go_neg_conf);
dev->go_neg_conf = p2p_build_go_neg_conf(p2p, dev, msg.dialog_token,
status, msg.operating_channel,
go);
p2p_parse_free(&msg);
if (dev->go_neg_conf == NULL)
return;
p2p_dbg(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;
dev->go_neg_conf_freq = freq;
dev->go_neg_conf_sent = 0;
if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr, sa,
wpabuf_head(dev->go_neg_conf),
wpabuf_len(dev->go_neg_conf), 50) < 0) {
p2p_dbg(p2p, "Failed to send Action frame");
p2p_go_neg_failed(p2p, -1);
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
} else
dev->go_neg_conf_sent++;
if (status != P2P_SC_SUCCESS) {
p2p_dbg(p2p, "GO Negotiation failed");
p2p_go_neg_failed(p2p, status);
}
}
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;
p2p_dbg(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) {
p2p_dbg(p2p, "Not ready for GO negotiation with " MACSTR,
MAC2STR(sa));
return;
}
if (p2p->pending_action_state == P2P_PENDING_GO_NEG_RESPONSE) {
p2p_dbg(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)) {
p2p_dbg(p2p, "Was not expecting GO Negotiation Confirm - ignore");
p2p_parse_free(&msg);
return;
}
dev->flags &= ~P2P_DEV_WAIT_GO_NEG_CONFIRM;
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
if (msg.dialog_token != dev->dialog_token) {
p2p_dbg(p2p, "Unexpected Dialog Token %u (expected %u)",
msg.dialog_token, dev->dialog_token);
p2p_parse_free(&msg);
return;
}
if (!msg.status) {
p2p_dbg(p2p, "No Status attribute received");
p2p_parse_free(&msg);
return;
}
if (*msg.status) {
p2p_dbg(p2p, "GO Negotiation rejected: status %d", *msg.status);
p2p_go_neg_failed(p2p, *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) {
p2p_dbg(p2p, "Mandatory P2P Group ID attribute missing from GO Negotiation Confirmation");
p2p->ssid_len = 0;
p2p_go_neg_failed(p2p, P2P_SC_FAIL_INVALID_PARAMS);
p2p_parse_free(&msg);
return;
}
if (!msg.operating_channel) {
p2p_dbg(p2p, "Mandatory Operating Channel attribute missing from GO Negotiation Confirmation");
#ifdef CONFIG_P2P_STRICT
p2p_parse_free(&msg);
return;
#endif /* CONFIG_P2P_STRICT */
} else if (dev->go_state == REMOTE_GO) {
int oper_freq = p2p_channel_to_freq(msg.operating_channel[3],
msg.operating_channel[4]);
if (oper_freq != dev->oper_freq) {
p2p_dbg(p2p, "Updated peer (GO) operating channel preference from %d MHz to %d MHz",
dev->oper_freq, oper_freq);
dev->oper_freq = oper_freq;
}
}
if (!msg.channel_list) {
p2p_dbg(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.
*/
p2p_dbg(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.
*/
p2p_dbg(p2p, "20 ms wait on current channel before starting group");
os_sleep(0, 20000);
p2p_go_complete(p2p, dev);
}