void p2p_process_prov_disc_req(struct p2p_data *p2p, const u8 *sa,
const u8 *data, size_t len, int rx_freq)
{
struct p2p_message msg;
struct p2p_device *dev;
int freq;
enum p2p_status_code reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
struct wpabuf *resp;
u32 adv_id = 0;
struct p2ps_advertisement *p2ps_adv = NULL;
u8 conncap = P2PS_SETUP_NEW;
u8 auto_accept = 0;
u32 session_id = 0;
u8 session_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
u8 adv_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
const u8 *group_mac;
int passwd_id = DEV_PW_DEFAULT;
u16 config_methods;
u16 allowed_config_methods = WPS_CONFIG_DISPLAY | WPS_CONFIG_KEYPAD;
struct p2ps_feature_capab resp_fcap = { 0, 0 };
struct p2ps_feature_capab *req_fcap = NULL;
u8 remote_conncap;
u16 method;
if (p2p_parse(data, len, &msg))
return;
p2p_dbg(p2p, "Received Provision Discovery Request from " MACSTR
" with config methods 0x%x (freq=%d)",
MAC2STR(sa), msg.wps_config_methods, rx_freq);
group_mac = msg.intended_addr;
dev = p2p_get_device(p2p, sa);
if (dev == NULL || (dev->flags & P2P_DEV_PROBE_REQ_ONLY)) {
p2p_dbg(p2p, "Provision Discovery Request from unknown peer "
MACSTR, MAC2STR(sa));
if (p2p_add_device(p2p, sa, rx_freq, NULL, 0, data + 1, len - 1,
0)) {
p2p_dbg(p2p, "Provision Discovery Request add device failed "
MACSTR, MAC2STR(sa));
goto out;
}
if (!dev) {
dev = p2p_get_device(p2p, sa);
if (!dev) {
p2p_dbg(p2p,
"Provision Discovery device not found "
MACSTR, MAC2STR(sa));
goto out;
}
}
} else if (msg.wfd_subelems) {
wpabuf_free(dev->info.wfd_subelems);
dev->info.wfd_subelems = wpabuf_dup(msg.wfd_subelems);
}
if (!msg.adv_id) {
allowed_config_methods |= WPS_CONFIG_PUSHBUTTON;
if (!(msg.wps_config_methods & allowed_config_methods)) {
p2p_dbg(p2p,
"Unsupported Config Methods in Provision Discovery Request");
goto out;
}
/* Legacy (non-P2PS) - Unknown groups allowed for P2PS */
if (msg.group_id) {
size_t i;
for (i = 0; i < p2p->num_groups; i++) {
if (p2p_group_is_group_id_match(
p2p->groups[i],
msg.group_id, msg.group_id_len))
break;
}
if (i == p2p->num_groups) {
p2p_dbg(p2p,
"PD request for unknown P2P Group ID - reject");
goto out;
}
}
} else {
allowed_config_methods |= WPS_CONFIG_P2PS;
/*
* Set adv_id here, so in case of an error, a P2PS PD Response
* will be sent.
*/
adv_id = WPA_GET_LE32(msg.adv_id);
if (p2ps_validate_pd_req(p2p, &msg, sa) < 0) {
reject = P2P_SC_FAIL_INVALID_PARAMS;
goto out;
}
req_fcap = (struct p2ps_feature_capab *) msg.feature_cap;
os_memcpy(session_mac, msg.session_mac, ETH_ALEN);
os_memcpy(adv_mac, msg.adv_mac, ETH_ALEN);
session_id = WPA_GET_LE32(msg.session_id);
if (msg.conn_cap)
conncap = *msg.conn_cap;
/*
* We need to verify a P2PS config methog in an initial PD
* request or in a follow-on PD request with the status
* SUCCESS_DEFERRED.
*/
if ((!msg.status || *msg.status == P2P_SC_SUCCESS_DEFERRED) &&
!(msg.wps_config_methods & allowed_config_methods)) {
p2p_dbg(p2p,
"Unsupported Config Methods in Provision Discovery Request");
goto out;
}
/*
* TODO: since we don't support multiple PD, reject PD request
* if we are in the middle of P2PS PD with some other peer
*/
}
dev->flags &= ~(P2P_DEV_PD_PEER_DISPLAY |
P2P_DEV_PD_PEER_KEYPAD |
P2P_DEV_PD_PEER_P2PS);
if (msg.wps_config_methods & WPS_CONFIG_DISPLAY) {
p2p_dbg(p2p, "Peer " MACSTR
" requested us to show a PIN on display", MAC2STR(sa));
dev->flags |= P2P_DEV_PD_PEER_KEYPAD;
passwd_id = DEV_PW_USER_SPECIFIED;
} else if (msg.wps_config_methods & WPS_CONFIG_KEYPAD) {
p2p_dbg(p2p, "Peer " MACSTR
" requested us to write its PIN using keypad",
MAC2STR(sa));
dev->flags |= P2P_DEV_PD_PEER_DISPLAY;
passwd_id = DEV_PW_REGISTRAR_SPECIFIED;
} else if (msg.wps_config_methods & WPS_CONFIG_P2PS) {
p2p_dbg(p2p, "Peer " MACSTR " requesting P2PS PIN",
MAC2STR(sa));
dev->flags |= P2P_DEV_PD_PEER_P2PS;
passwd_id = DEV_PW_P2PS_DEFAULT;
}
/* Remove stale persistent groups */
if (p2p->cfg->remove_stale_groups) {
p2p->cfg->remove_stale_groups(
p2p->cfg->cb_ctx, dev->info.p2p_device_addr,
msg.persistent_dev,
msg.persistent_ssid, msg.persistent_ssid_len);
}
reject = P2P_SC_SUCCESS;
/*
* End of a legacy P2P PD Request processing, from this point continue
* with P2PS one.
*/
if (!msg.adv_id)
goto out;
remote_conncap = conncap;
if (!msg.status) {
unsigned int forced_freq, pref_freq;
if (os_memcmp(p2p->cfg->dev_addr, msg.adv_mac, ETH_ALEN)) {
p2p_dbg(p2p,
"P2PS PD adv mac does not match the local one");
reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
goto out;
}
p2ps_adv = p2p_service_p2ps_id(p2p, adv_id);
if (!p2ps_adv) {
p2p_dbg(p2p, "P2PS PD invalid adv_id=0x%X", adv_id);
reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
goto out;
}
p2p_dbg(p2p, "adv_id: 0x%X, p2ps_adv: %p", adv_id, p2ps_adv);
auto_accept = p2ps_adv->auto_accept;
conncap = p2p->cfg->p2ps_group_capability(p2p->cfg->cb_ctx,
conncap, auto_accept,
&forced_freq,
&pref_freq);
p2p_dbg(p2p, "Conncap: local:%d remote:%d result:%d",
auto_accept, remote_conncap, conncap);
p2p_prepare_channel(p2p, dev, forced_freq, pref_freq, 0);
resp_fcap.cpt = p2ps_own_preferred_cpt(p2ps_adv->cpt_priority,
req_fcap->cpt);
p2p_dbg(p2p, "cpt: service:0x%x remote:0x%x result:0x%x",
p2ps_adv->cpt_mask, req_fcap->cpt, resp_fcap.cpt);
if (!resp_fcap.cpt) {
p2p_dbg(p2p,
"Incompatible P2PS feature capability CPT bitmask");
reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
} else if (p2ps_adv->config_methods &&
!(msg.wps_config_methods &
p2ps_adv->config_methods)) {
p2p_dbg(p2p,
"Unsupported config methods in Provision Discovery Request (own=0x%x peer=0x%x)",
p2ps_adv->config_methods,
msg.wps_config_methods);
reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
} else if (!p2ps_adv->state) {
p2p_dbg(p2p, "P2PS state unavailable");
reject = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
} else if (!conncap) {
p2p_dbg(p2p, "Conncap resolution failed");
reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
}
if (msg.wps_config_methods & WPS_CONFIG_KEYPAD) {
p2p_dbg(p2p, "Keypad - always defer");
auto_accept = 0;
}
if ((remote_conncap & (P2PS_SETUP_NEW | P2PS_SETUP_CLIENT) ||
msg.persistent_dev) && conncap != P2PS_SETUP_NEW &&
msg.channel_list && msg.channel_list_len &&
p2p_peer_channels_check(p2p, &p2p->channels, dev,
msg.channel_list,
msg.channel_list_len) < 0) {
p2p_dbg(p2p,
"No common channels - force deferred flow");
auto_accept = 0;
}
if (((remote_conncap & P2PS_SETUP_GROUP_OWNER) ||
msg.persistent_dev) && msg.operating_channel) {
struct p2p_channels intersect;
/*
* There are cases where only the operating channel is
* provided. This requires saving the channel as the
* supported channel list, and verifying that it is
* supported.
*/
if (dev->channels.reg_classes == 0 ||
!p2p_channels_includes(&dev->channels,
msg.operating_channel[3],
msg.operating_channel[4])) {
struct p2p_channels *ch = &dev->channels;
os_memset(ch, 0, sizeof(*ch));
ch->reg_class[0].reg_class =
msg.operating_channel[3];
ch->reg_class[0].channel[0] =
msg.operating_channel[4];
ch->reg_class[0].channels = 1;
ch->reg_classes = 1;
}
p2p_channels_intersect(&p2p->channels, &dev->channels,
&intersect);
if (intersect.reg_classes == 0) {
p2p_dbg(p2p,
"No common channels - force deferred flow");
auto_accept = 0;
}
}
if (auto_accept || reject != P2P_SC_SUCCESS) {
struct p2ps_provision *tmp;
if (p2ps_setup_p2ps_prov(p2p, adv_id, session_id,
msg.wps_config_methods,
session_mac, adv_mac) < 0) {
reject = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
goto out;
}
tmp = p2p->p2ps_prov;
tmp->force_freq = forced_freq;
tmp->pref_freq = pref_freq;
if (conncap) {
tmp->conncap = conncap;
tmp->status = P2P_SC_SUCCESS;
} else {
tmp->conncap = auto_accept;
tmp->status = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
}
if (reject != P2P_SC_SUCCESS)
goto out;
}
}
if (!msg.status && !auto_accept &&
(!p2p->p2ps_prov || p2p->p2ps_prov->adv_id != adv_id)) {
struct p2ps_provision *tmp;
if (!conncap) {
reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
goto out;
}
if (p2ps_setup_p2ps_prov(p2p, adv_id, session_id,
msg.wps_config_methods,
session_mac, adv_mac) < 0) {
reject = P2P_SC_FAIL_UNABLE_TO_ACCOMMODATE;
goto out;
}
tmp = p2p->p2ps_prov;
reject = P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE;
tmp->status = reject;
}
/* Not a P2PS Follow-on PD */
if (!msg.status)
goto out;
if (*msg.status && *msg.status != P2P_SC_SUCCESS_DEFERRED) {
reject = *msg.status;
goto out;
}
if (*msg.status != P2P_SC_SUCCESS_DEFERRED || !p2p->p2ps_prov)
goto out;
if (p2p->p2ps_prov->adv_id != adv_id ||
os_memcmp(p2p->p2ps_prov->adv_mac, msg.adv_mac, ETH_ALEN)) {
p2p_dbg(p2p,
"P2PS Follow-on PD with mismatch Advertisement ID/MAC");
goto out;
}
if (p2p->p2ps_prov->session_id != session_id ||
os_memcmp(p2p->p2ps_prov->session_mac, msg.session_mac, ETH_ALEN)) {
p2p_dbg(p2p, "P2PS Follow-on PD with mismatch Session ID/MAC");
goto out;
}
method = p2p->p2ps_prov->method;
conncap = p2p->cfg->p2ps_group_capability(p2p->cfg->cb_ctx,
remote_conncap,
p2p->p2ps_prov->conncap,
&p2p->p2ps_prov->force_freq,
&p2p->p2ps_prov->pref_freq);
resp_fcap.cpt = p2ps_own_preferred_cpt(p2p->p2ps_prov->cpt_priority,
req_fcap->cpt);
p2p_dbg(p2p, "cpt: local:0x%x remote:0x%x result:0x%x",
p2p->p2ps_prov->cpt_mask, req_fcap->cpt, resp_fcap.cpt);
p2p_prepare_channel(p2p, dev, p2p->p2ps_prov->force_freq,
p2p->p2ps_prov->pref_freq, 0);
/*
* Ensure that if we asked for PIN originally, our method is consistent
* with original request.
*/
if (method & WPS_CONFIG_DISPLAY)
method = WPS_CONFIG_KEYPAD;
else if (method & WPS_CONFIG_KEYPAD)
method = WPS_CONFIG_DISPLAY;
if (!conncap || !(msg.wps_config_methods & method)) {
/*
* Reject this "Deferred Accept*
* if incompatible conncap or method
*/
reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
} else if (!resp_fcap.cpt) {
p2p_dbg(p2p,
"Incompatible P2PS feature capability CPT bitmask");
reject = P2P_SC_FAIL_INCOMPATIBLE_PARAMS;
} else if ((remote_conncap & (P2PS_SETUP_NEW | P2PS_SETUP_CLIENT) ||
msg.persistent_dev) && conncap != P2PS_SETUP_NEW &&
msg.channel_list && msg.channel_list_len &&
p2p_peer_channels_check(p2p, &p2p->channels, dev,
msg.channel_list,
msg.channel_list_len) < 0) {
p2p_dbg(p2p,
"No common channels in Follow-On Provision Discovery Request");
reject = P2P_SC_FAIL_NO_COMMON_CHANNELS;
} else {
reject = P2P_SC_SUCCESS;
}
dev->oper_freq = 0;
if (reject == P2P_SC_SUCCESS || reject == P2P_SC_SUCCESS_DEFERRED) {
u8 tmp;
if (msg.operating_channel)
dev->oper_freq =
p2p_channel_to_freq(msg.operating_channel[3],
msg.operating_channel[4]);
if ((conncap & P2PS_SETUP_GROUP_OWNER) &&
p2p_go_select_channel(p2p, dev, &tmp) < 0)
reject = P2P_SC_FAIL_NO_COMMON_CHANNELS;
}
p2p->p2ps_prov->status = reject;
p2p->p2ps_prov->conncap = conncap;
out:
if (reject == P2P_SC_SUCCESS ||
reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE)
config_methods = msg.wps_config_methods;
else
config_methods = 0;
/*
* Send PD Response for an initial PD Request or for follow-on
* PD Request with P2P_SC_SUCCESS_DEFERRED status.
*/
if (!msg.status || *msg.status == P2P_SC_SUCCESS_DEFERRED) {
resp = p2p_build_prov_disc_resp(p2p, dev, msg.dialog_token,
reject, config_methods, adv_id,
msg.group_id, msg.group_id_len,
msg.persistent_ssid,
msg.persistent_ssid_len,
(const u8 *) &resp_fcap,
sizeof(resp_fcap));
if (!resp) {
p2p_parse_free(&msg);
return;
}
p2p_dbg(p2p, "Sending Provision Discovery 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);
p2p_parse_free(&msg);
return;
}
p2p->pending_action_state = P2P_PENDING_PD_RESPONSE;
if (p2p_send_action(p2p, freq, sa, p2p->cfg->dev_addr,
p2p->cfg->dev_addr,
wpabuf_head(resp), wpabuf_len(resp),
200) < 0)
p2p_dbg(p2p, "Failed to send Action frame");
else
p2p->send_action_in_progress = 1;
wpabuf_free(resp);
}
if (!dev) {
p2p_parse_free(&msg);
return;
}
freq = 0;
if (reject == P2P_SC_SUCCESS && conncap == P2PS_SETUP_GROUP_OWNER) {
freq = p2p_channel_to_freq(p2p->op_reg_class,
p2p->op_channel);
if (freq < 0)
freq = 0;
}
if (!p2p->cfg->p2ps_prov_complete) {
/* Don't emit anything */
} else if (msg.status && *msg.status != P2P_SC_SUCCESS &&
*msg.status != P2P_SC_SUCCESS_DEFERRED) {
reject = *msg.status;
p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, reject,
sa, adv_mac, session_mac,
NULL, adv_id, session_id,
0, 0, msg.persistent_ssid,
msg.persistent_ssid_len,
0, 0, NULL, NULL, 0, freq);
} else if (msg.status && *msg.status == P2P_SC_SUCCESS_DEFERRED &&
p2p->p2ps_prov) {
p2p->p2ps_prov->status = reject;
p2p->p2ps_prov->conncap = conncap;
if (reject != P2P_SC_SUCCESS)
p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, reject,
sa, adv_mac, session_mac,
NULL, adv_id,
session_id, conncap, 0,
msg.persistent_ssid,
msg.persistent_ssid_len, 0,
0, NULL, NULL, 0, freq);
else
p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx,
*msg.status,
sa, adv_mac, session_mac,
group_mac, adv_id,
session_id, conncap,
passwd_id,
msg.persistent_ssid,
msg.persistent_ssid_len, 0,
0, NULL,
(const u8 *) &resp_fcap,
sizeof(resp_fcap), freq);
} else if (msg.status && p2p->p2ps_prov) {
p2p->p2ps_prov->status = P2P_SC_SUCCESS;
p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, *msg.status, sa,
adv_mac, session_mac, group_mac,
adv_id, session_id, conncap,
passwd_id,
msg.persistent_ssid,
msg.persistent_ssid_len,
0, 0, NULL,
(const u8 *) &resp_fcap,
sizeof(resp_fcap), freq);
} else if (msg.status) {
} else if (auto_accept && reject == P2P_SC_SUCCESS) {
p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, P2P_SC_SUCCESS,
sa, adv_mac, session_mac,
group_mac, adv_id, session_id,
conncap, passwd_id,
msg.persistent_ssid,
msg.persistent_ssid_len,
0, 0, NULL,
(const u8 *) &resp_fcap,
sizeof(resp_fcap), freq);
} else if (reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE &&
(!msg.session_info || !msg.session_info_len)) {
p2p->p2ps_prov->method = msg.wps_config_methods;
p2p->cfg->p2ps_prov_complete(p2p->cfg->cb_ctx, P2P_SC_SUCCESS,
sa, adv_mac, session_mac,
group_mac, adv_id, session_id,
conncap, passwd_id,
msg.persistent_ssid,
msg.persistent_ssid_len,
0, 1, NULL,
(const u8 *) &resp_fcap,
sizeof(resp_fcap), freq);
} else if (reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) {
size_t buf_len = msg.session_info_len;
char *buf = os_malloc(2 * buf_len + 1);
if (buf) {
p2p->p2ps_prov->method = msg.wps_config_methods;
utf8_escape((char *) msg.session_info, buf_len,
buf, 2 * buf_len + 1);
p2p->cfg->p2ps_prov_complete(
p2p->cfg->cb_ctx, P2P_SC_SUCCESS, sa,
adv_mac, session_mac, group_mac, adv_id,
session_id, conncap, passwd_id,
msg.persistent_ssid, msg.persistent_ssid_len,
0, 1, buf,
(const u8 *) &resp_fcap, sizeof(resp_fcap),
freq);
os_free(buf);
}
}
/*
* prov_disc_req callback is used to generate P2P-PROV-DISC-ENTER-PIN,
* P2P-PROV-DISC-SHOW-PIN, and P2P-PROV-DISC-PBC-REQ events.
* Call it either on legacy P2P PD or on P2PS PD only if we need to
* enter/show PIN.
*
* The callback is called in the following cases:
* 1. Legacy P2P PD request, response status SUCCESS
* 2. P2PS advertiser, method: DISPLAY, autoaccept: TRUE,
* response status: SUCCESS
* 3. P2PS advertiser, method DISPLAY, autoaccept: FALSE,
* response status: INFO_CURRENTLY_UNAVAILABLE
* 4. P2PS advertiser, method: KEYPAD, autoaccept==any,
* response status: INFO_CURRENTLY_UNAVAILABLE
* 5. P2PS follow-on with SUCCESS_DEFERRED,
* advertiser role: DISPLAY, autoaccept: FALSE,
* seeker: KEYPAD, response status: SUCCESS
*/
if (p2p->cfg->prov_disc_req &&
((reject == P2P_SC_SUCCESS && !msg.adv_id) ||
(!msg.status &&
(reject == P2P_SC_SUCCESS ||
reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE) &&
passwd_id == DEV_PW_USER_SPECIFIED) ||
(!msg.status &&
reject == P2P_SC_FAIL_INFO_CURRENTLY_UNAVAILABLE &&
passwd_id == DEV_PW_REGISTRAR_SPECIFIED) ||
(reject == P2P_SC_SUCCESS &&
msg.status && *msg.status == P2P_SC_SUCCESS_DEFERRED &&
passwd_id == DEV_PW_REGISTRAR_SPECIFIED))) {
const u8 *dev_addr = sa;
if (msg.p2p_device_addr)
dev_addr = msg.p2p_device_addr;
p2p->cfg->prov_disc_req(p2p->cfg->cb_ctx, sa,
msg.wps_config_methods,
dev_addr, msg.pri_dev_type,
msg.device_name, msg.config_methods,
msg.capability ? msg.capability[0] : 0,
msg.capability ? msg.capability[1] :
0,
msg.group_id, msg.group_id_len);
}
if (reject == P2P_SC_SUCCESS) {
switch (config_methods) {
case WPS_CONFIG_DISPLAY:
dev->wps_prov_info = WPS_CONFIG_KEYPAD;
break;
case WPS_CONFIG_KEYPAD:
dev->wps_prov_info = WPS_CONFIG_DISPLAY;
break;
case WPS_CONFIG_PUSHBUTTON:
dev->wps_prov_info = WPS_CONFIG_PUSHBUTTON;
break;
case WPS_CONFIG_P2PS:
dev->wps_prov_info = WPS_CONFIG_P2PS;
break;
default:
dev->wps_prov_info = 0;
break;
}
if (msg.intended_addr)
os_memcpy(dev->interface_addr, msg.intended_addr,
ETH_ALEN);
}
p2p_parse_free(&msg);
}
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) {
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 {
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) {
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_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 all_channels, intersection, *channels = NULL;
int persistent;
os_memset(group_bssid, 0, sizeof(group_bssid));
p2p_dbg(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)) {
p2p_dbg(p2p, "Invitation Request from unknown peer " MACSTR,
MAC2STR(sa));
if (p2p_add_device(p2p, sa, rx_freq, NULL, 0, data + 1, len - 1,
0)) {
p2p_dbg(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) {
p2p_dbg(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) {
p2p_dbg(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.
*/
p2p_dbg(p2p, "Mandatory Invitation Flags attribute missing from Invitation Request");
persistent = 1;
}
p2p_channels_union(&p2p->cfg->channels, &p2p->cfg->cli_channels,
&all_channels);
if (p2p_peer_channels_check(p2p, &all_channels, 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;
}
p2p_channels_dump(p2p, "own channels", &p2p->cfg->channels);
p2p_channels_dump(p2p, "own client channels", &all_channels);
p2p_channels_dump(p2p, "peer channels", &dev->channels);
p2p_channels_intersect(&all_channels, &dev->channels,
&intersection);
p2p_channels_dump(p2p, "intersection", &intersection);
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, &intersection,
msg.dev_password_id_present ? msg.dev_password_id : -1);
}
if (go) {
p2p_channels_intersect(&p2p->cfg->channels, &dev->channels,
&intersection);
p2p_channels_dump(p2p, "intersection(GO)", &intersection);
if (intersection.reg_classes == 0) {
p2p_dbg(p2p, "No common channels found (GO)");
status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
goto fail;
}
}
if (op_freq) {
p2p_dbg(p2p, "Invitation processing forced frequency %d MHz",
op_freq);
if (p2p_freq_to_channel(op_freq, ®_class, &channel) < 0) {
p2p_dbg(p2p, "Unknown forced freq %d MHz from invitation_process()",
op_freq);
status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
goto fail;
}
if (!p2p_channels_includes(&intersection, reg_class, channel))
{
p2p_dbg(p2p, "forced freq %d MHz not in the supported channels intersection",
op_freq);
status = P2P_SC_FAIL_NO_COMMON_CHANNELS;
goto fail;
}
if (status == P2P_SC_SUCCESS)
channels = &intersection;
} else {
p2p_dbg(p2p, "No forced channel from invitation processing - figure out best one to use");
/* Default to own configuration as a starting point */
p2p->op_reg_class = p2p->cfg->op_reg_class;
p2p->op_channel = p2p->cfg->op_channel;
p2p_dbg(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(
msg.operating_channel[3],
msg.operating_channel[4]);
p2p_dbg(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];
p2p_dbg(p2p, "Use peer preference op_class %d channel %d",
p2p->op_reg_class, p2p->op_channel);
} else {
p2p_dbg(p2p, "Cannot use peer channel preference");
}
}
/* Reselect the channel only for the case of the GO */
if (go &&
!p2p_channels_includes(&intersection, p2p->op_reg_class,
p2p->op_channel)) {
p2p_dbg(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);
p2p_dbg(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)) {
p2p_dbg(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;
}
} else if (go && !(dev->flags & P2P_DEV_FORCE_FREQ) &&
!p2p->cfg->cfg_op_channel) {
p2p_dbg(p2p, "Try to reselect 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);
}
/*
* Use the driver preferred frequency list extension if
* supported.
*/
p2p_check_pref_chan(p2p, go, dev, &msg);
op_freq = p2p_channel_to_freq(p2p->op_reg_class,
p2p->op_channel);
if (op_freq < 0) {
p2p_dbg(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;
}
p2p_dbg(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->reg_class,
p2p->cfg->channel);
if (freq < 0) {
p2p_dbg(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) {
if (msg.group_id_len - ETH_ALEN <= SSID_MAX_LEN) {
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);
} else {
p2p->inv_ssid_len = 0;
os_memset(p2p->inv_go_dev_addr, 0, 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), 50) < 0) {
p2p_dbg(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;
struct p2p_channels intersection, *channels = NULL;
p2p_dbg(p2p, "Received Invitation Response from " MACSTR,
MAC2STR(sa));
dev = p2p_get_device(p2p, sa);
if (dev == NULL) {
p2p_dbg(p2p, "Ignore Invitation Response from unknown peer "
MACSTR, MAC2STR(sa));
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
return;
}
if (dev != p2p->invite_peer) {
p2p_dbg(p2p, "Ignore unexpected Invitation Response from peer "
MACSTR, MAC2STR(sa));
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
return;
}
if (p2p_parse(data, len, &msg)) {
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
return;
}
if (!msg.status) {
p2p_dbg(p2p, "Mandatory Status attribute missing in Invitation Response from "
MACSTR, MAC2STR(sa));
p2p_parse_free(&msg);
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
return;
}
/*
* We should not really receive a replayed response twice since
* duplicate frames are supposed to be dropped. However, not all drivers
* do that for pre-association frames. We did not use to verify dialog
* token matches for invitation response frames, but that check can be
* safely used to drop a replayed response to the previous Invitation
* Request in case the suggested operating channel was changed. This
* allows a duplicated reject frame to be dropped with the assumption
* that the real response follows after it.
*/
if (*msg.status == P2P_SC_FAIL_NO_COMMON_CHANNELS &&
p2p->retry_invite_req_sent &&
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_SC_FAIL_NO_COMMON_CHANNELS &&
p2p->retry_invite_req &&
p2p_channel_random_social(&p2p->cfg->channels, &p2p->op_reg_class,
&p2p->op_channel, NULL, NULL) == 0) {
p2p->retry_invite_req = 0;
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
p2p->cfg->stop_listen(p2p->cfg->cb_ctx);
p2p_set_state(p2p, P2P_INVITE);
p2p_dbg(p2p, "Resend Invitation Request setting op_class %u channel %u as operating channel",
p2p->op_reg_class, p2p->op_channel);
p2p->retry_invite_req_sent = 1;
p2p_invite_send(p2p, p2p->invite_peer, p2p->invite_go_dev_addr,
p2p->invite_dev_pw_id);
p2p_parse_free(&msg);
return;
}
p2p->cfg->send_action_done(p2p->cfg->cb_ctx);
p2p->retry_invite_req = 0;
if (!msg.channel_list && *msg.status == P2P_SC_SUCCESS) {
p2p_dbg(p2p, "Mandatory Channel List attribute missing in Invitation Response from "
MACSTR, MAC2STR(sa));
#ifdef CONFIG_P2P_STRICT
p2p_parse_free(&msg);
return;
#endif /* CONFIG_P2P_STRICT */
/* Try to survive without peer channel list */
channels = &p2p->channels;
} else if (!msg.channel_list) {
/* Non-success cases are not required to include Channel List */
channels = &p2p->channels;
} else if (p2p_peer_channels_check(p2p, &p2p->channels, dev,
msg.channel_list,
msg.channel_list_len) < 0) {
p2p_dbg(p2p, "No common channels found");
p2p_parse_free(&msg);
return;
} else {
p2p_channels_intersect(&p2p->channels, &dev->channels,
&intersection);
channels = &intersection;
}
if (p2p->cfg->invitation_result) {
int peer_oper_freq = 0;
int freq = p2p_channel_to_freq(p2p->op_reg_class,
p2p->op_channel);
if (freq < 0)
freq = 0;
if (msg.operating_channel) {
peer_oper_freq = p2p_channel_to_freq(
msg.operating_channel[3],
msg.operating_channel[4]);
if (peer_oper_freq < 0)
peer_oper_freq = 0;
}
/*
* Use the driver preferred frequency list extension if
* supported.
*/
p2p_check_pref_chan(p2p, 0, dev, &msg);
p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status,
msg.group_bssid, channels, sa,
freq, peer_oper_freq);
}
p2p_parse_free(&msg);
p2p_clear_timeout(p2p);
p2p_set_state(p2p, P2P_IDLE);
p2p->invite_peer = NULL;
}
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;
struct p2p_channels intersection, *channels = NULL;
p2p_dbg(p2p, "Received Invitation Response from " MACSTR,
MAC2STR(sa));
dev = p2p_get_device(p2p, sa);
if (dev == NULL) {
p2p_dbg(p2p, "Ignore Invitation Response from unknown peer "
MACSTR, MAC2STR(sa));
return;
}
if (dev != p2p->invite_peer) {
p2p_dbg(p2p, "Ignore unexpected Invitation Response from peer "
MACSTR, MAC2STR(sa));
return;
}
if (p2p_parse(data, len, &msg))
return;
if (!msg.status) {
p2p_dbg(p2p, "Mandatory Status attribute missing in Invitation Response from "
MACSTR, MAC2STR(sa));
p2p_parse_free(&msg);
return;
}
if (!msg.channel_list && *msg.status == P2P_SC_SUCCESS) {
p2p_dbg(p2p, "Mandatory Channel List attribute missing in Invitation Response from "
MACSTR, MAC2STR(sa));
#ifdef CONFIG_P2P_STRICT
p2p_parse_free(&msg);
return;
#endif /* CONFIG_P2P_STRICT */
/* Try to survive without peer channel list */
channels = &p2p->channels;
} else if (!msg.channel_list) {
/* Non-success cases are not required to include Channel List */
channels = &p2p->channels;
} else if (p2p_peer_channels_check(p2p, &p2p->channels, dev,
msg.channel_list,
msg.channel_list_len) < 0) {
p2p_dbg(p2p, "No common channels found");
p2p_parse_free(&msg);
return;
} else {
p2p_channels_intersect(&p2p->channels, &dev->channels,
&intersection);
channels = &intersection;
}
if (p2p->cfg->invitation_result) {
int freq = p2p_channel_to_freq(p2p->op_reg_class,
p2p->op_channel);
if (freq < 0)
freq = 0;
p2p->cfg->invitation_result(p2p->cfg->cb_ctx, *msg.status,
msg.group_bssid, channels, sa,
freq);
}
p2p_parse_free(&msg);
p2p_clear_timeout(p2p);
p2p_set_state(p2p, P2P_IDLE);
p2p->invite_peer = NULL;
}