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P2P NFC: Build connection handover messages

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"NFC_GET_HANDOVER_{REQ,SEL} NDEF P2P-CR" can now be used to build P2P
alternative carrier record for NFC connection handover request/select
messages.

Static connection handover case can be enabled by configuring the DH
parameters (either with wps_nfc_* configuration parameters or with
WPS_NFC_TOKEN command at run time. The NFC Tag contents can be generated
with "NFC_GET_HANDOVER_SEL NDEF P2P-CR-TAG" after having configured
Listen channel (p2p_listen_reg_class/p2p_listen_channel).

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2013-02-15 17:07:28 +02:00 committed by Jouni Malinen
parent c00ab85f7e
commit 9358878055
7 changed files with 233 additions and 0 deletions
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52
src/p2p/p2p.c
View File

@ -4370,3 +4370,55 @@ void p2p_err(struct p2p_data *p2p, const char *fmt, ...)
va_end(ap);
p2p->cfg->debug_print(p2p->cfg->cb_ctx, MSG_ERROR, buf);
}
#ifdef CONFIG_WPS_NFC
static struct wpabuf * p2p_build_nfc_handover(struct p2p_data *p2p)
{
struct wpabuf *buf;
u8 op_class, channel;
enum p2p_role_indication role = P2P_DEVICE_NOT_IN_GROUP;
buf = wpabuf_alloc(1000);
if (buf == NULL)
return NULL;
op_class = p2p->cfg->reg_class;
channel = p2p->cfg->channel;
p2p_buf_add_capability(buf, p2p->dev_capab &
~P2P_DEV_CAPAB_CLIENT_DISCOVERABILITY, 0);
p2p_buf_add_device_info(buf, p2p, NULL);
if (p2p->num_groups > 0) {
role = P2P_GO_IN_A_GROUP;
p2p_freq_to_channel(p2p_group_get_freq(p2p->groups[0]),
&op_class, &channel);
}
p2p_buf_add_oob_go_neg_channel(buf, p2p->cfg->country, op_class,
channel, role);
if (p2p->num_groups > 0) {
/* Limit number of clients to avoid very long message */
p2p_buf_add_group_info(p2p->groups[0], buf, 5);
p2p_group_buf_add_id(p2p->groups[0], buf);
}
return buf;
}
struct wpabuf * p2p_build_nfc_handover_req(struct p2p_data *p2p)
{
return p2p_build_nfc_handover(p2p);
}
struct wpabuf * p2p_build_nfc_handover_sel(struct p2p_data *p2p)
{
return p2p_build_nfc_handover(p2p);
}
#endif /* CONFIG_WPS_NFC */

3
src/p2p/p2p.h
View File

@ -1897,4 +1897,7 @@ int p2p_set_disc_int(struct p2p_data *p2p, int min_disc_int, int max_disc_int,
*/
const char * p2p_get_state_txt(struct p2p_data *p2p);
struct wpabuf * p2p_build_nfc_handover_req(struct p2p_data *p2p);
struct wpabuf * p2p_build_nfc_handover_sel(struct p2p_data *p2p);
#endif /* P2P_H */

7
src/p2p/p2p_group.c
View File

@ -419,6 +419,13 @@ void p2p_buf_add_group_info(struct p2p_group *group, struct wpabuf *buf,
}
void p2p_group_buf_add_id(struct p2p_group *group, struct wpabuf *buf)
{
p2p_buf_add_group_id(buf, group->p2p->cfg->dev_addr, group->cfg->ssid,
group->cfg->ssid_len);
}
static struct wpabuf * p2p_group_build_probe_resp_ie(struct p2p_group *group)
{
struct wpabuf *p2p_subelems, *ie;

1
src/p2p/p2p_i.h
View File

@ -613,6 +613,7 @@ void p2p_group_force_beacon_update_ies(struct p2p_group *group);
struct wpabuf * p2p_group_get_wfd_ie(struct p2p_group *g);
void p2p_buf_add_group_info(struct p2p_group *group, struct wpabuf *buf,
int max_clients);
void p2p_group_buf_add_id(struct p2p_group *group, struct wpabuf *buf);
int p2p_group_get_freq(struct p2p_group *group);

63
wpa_supplicant/ctrl_iface.c
View File

@ -928,6 +928,30 @@ static int wpas_ctrl_nfc_get_handover_req_wps(struct wpa_supplicant *wpa_s,
}
static int wpas_ctrl_nfc_get_handover_req_p2p(struct wpa_supplicant *wpa_s,
char *reply, size_t max_len,
int ndef)
{
struct wpabuf *buf;
int res;
buf = wpas_p2p_nfc_handover_req(wpa_s, ndef);
if (buf == NULL) {
wpa_printf(MSG_DEBUG, "P2P: Could not generate NFC handover request");
return -1;
}
res = wpa_snprintf_hex_uppercase(reply, max_len, wpabuf_head(buf),
wpabuf_len(buf));
reply[res++] = '\n';
reply[res] = '\0';
wpabuf_free(buf);
return res;
}
static int wpas_ctrl_nfc_get_handover_req(struct wpa_supplicant *wpa_s,
char *cmd, char *reply,
size_t max_len)
@ -954,6 +978,11 @@ static int wpas_ctrl_nfc_get_handover_req(struct wpa_supplicant *wpa_s,
wpa_s, reply, max_len, ndef);
}
if (os_strcmp(pos, "P2P-CR") == 0) {
return wpas_ctrl_nfc_get_handover_req_p2p(
wpa_s, reply, max_len, ndef);
}
return -1;
}
@ -980,6 +1009,28 @@ static int wpas_ctrl_nfc_get_handover_sel_wps(struct wpa_supplicant *wpa_s,
}
static int wpas_ctrl_nfc_get_handover_sel_p2p(struct wpa_supplicant *wpa_s,
char *reply, size_t max_len,
int ndef, int tag)
{
struct wpabuf *buf;
int res;
buf = wpas_p2p_nfc_handover_sel(wpa_s, ndef, tag);
if (buf == NULL)
return -1;
res = wpa_snprintf_hex_uppercase(reply, max_len, wpabuf_head(buf),
wpabuf_len(buf));
reply[res++] = '\n';
reply[res] = '\0';
wpabuf_free(buf);
return res;
}
static int wpas_ctrl_nfc_get_handover_sel(struct wpa_supplicant *wpa_s,
char *cmd, char *reply,
size_t max_len)
@ -1003,11 +1054,23 @@ static int wpas_ctrl_nfc_get_handover_sel(struct wpa_supplicant *wpa_s,
if (pos2)
*pos2++ = '\0';
if (os_strcmp(pos, "WPS") == 0 || os_strcmp(pos, "WPS-CR") == 0) {
if (!ndef)
return -1;
return wpas_ctrl_nfc_get_handover_sel_wps(
wpa_s, reply, max_len, ndef,
os_strcmp(pos, "WPS-CR") == 0, pos2);
}
if (os_strcmp(pos, "P2P-CR") == 0) {
return wpas_ctrl_nfc_get_handover_sel_p2p(
wpa_s, reply, max_len, ndef, 0);
}
if (os_strcmp(pos, "P2P-CR-TAG") == 0) {
return wpas_ctrl_nfc_get_handover_sel_p2p(
wpa_s, reply, max_len, ndef, 1);
}
return -1;
}

103
wpa_supplicant/p2p_supplicant.c
View File

@ -6923,3 +6923,106 @@ int wpas_p2p_4way_hs_failed(struct wpa_supplicant *wpa_s)
wpa_s->p2p_last_4way_hs_fail = ssid;
return 0;
}
#ifdef CONFIG_WPS_NFC
static struct wpabuf * wpas_p2p_nfc_handover(int ndef, struct wpabuf *wsc,
struct wpabuf *p2p)
{
struct wpabuf *ret;
if (wsc == NULL) {
wpabuf_free(p2p);
return NULL;
}
if (p2p == NULL) {
wpabuf_free(wsc);
wpa_printf(MSG_DEBUG, "P2P: No p2p buffer for handover");
return NULL;
}
ret = wpabuf_alloc(2 + wpabuf_len(wsc) + 2 + wpabuf_len(p2p));
if (ret == NULL) {
wpabuf_free(wsc);
wpabuf_free(p2p);
return NULL;
}
wpabuf_put_be16(ret, wpabuf_len(wsc));
wpabuf_put_buf(ret, wsc);
wpabuf_put_be16(ret, wpabuf_len(p2p));
wpabuf_put_buf(ret, p2p);
wpabuf_free(wsc);
wpabuf_free(p2p);
wpa_hexdump_buf(MSG_DEBUG,
"P2P: Generated NFC connection handover message", ret);
if (ndef && ret) {
struct wpabuf *tmp;
tmp = ndef_build_p2p(ret);
wpabuf_free(ret);
if (tmp == NULL) {
wpa_printf(MSG_DEBUG, "P2P: Failed to NDEF encapsulate handover request");
return NULL;
}
ret = tmp;
}
return ret;
}
struct wpabuf * wpas_p2p_nfc_handover_req(struct wpa_supplicant *wpa_s,
int ndef)
{
struct wpabuf *wsc, *p2p;
if (wpa_s->global->p2p_disabled || wpa_s->global->p2p == NULL) {
wpa_printf(MSG_DEBUG, "P2P: P2P disabled - cannot build handover request");
return NULL;
}
if (wpa_s->conf->wps_nfc_dh_pubkey == NULL &&
wps_nfc_gen_dh(&wpa_s->conf->wps_nfc_dh_pubkey,
&wpa_s->conf->wps_nfc_dh_privkey) < 0) {
wpa_dbg(wpa_s, MSG_DEBUG, "P2P: No DH key available for handover request");
return NULL;
}
wsc = wps_build_nfc_handover_req_p2p(wpa_s->parent->wps,
wpa_s->conf->wps_nfc_dh_pubkey);
p2p = p2p_build_nfc_handover_req(wpa_s->global->p2p);
return wpas_p2p_nfc_handover(ndef, wsc, p2p);
}
struct wpabuf * wpas_p2p_nfc_handover_sel(struct wpa_supplicant *wpa_s,
int ndef, int tag)
{
struct wpabuf *wsc, *p2p;
if (wpa_s->global->p2p_disabled || wpa_s->global->p2p == NULL)
return NULL;
if (!tag && wpa_s->conf->wps_nfc_dh_pubkey == NULL &&
wps_nfc_gen_dh(&wpa_s->conf->wps_nfc_dh_pubkey,
&wpa_s->conf->wps_nfc_dh_privkey) < 0)
return NULL;
wsc = wps_build_nfc_handover_sel_p2p(wpa_s->parent->wps,
tag ?
wpa_s->conf->wps_nfc_dev_pw_id :
DEV_PW_NFC_CONNECTION_HANDOVER,
wpa_s->conf->wps_nfc_dh_pubkey,
tag ? wpa_s->conf->wps_nfc_dev_pw :
NULL);
p2p = p2p_build_nfc_handover_sel(wpa_s->global->p2p);
return wpas_p2p_nfc_handover(ndef, wsc, p2p);
}
#endif /* CONFIG_WPS_NFC */

4
wpa_supplicant/p2p_supplicant.h
View File

@ -148,6 +148,10 @@ void wpas_p2p_new_psk_cb(struct wpa_supplicant *wpa_s, const u8 *mac_addr,
const u8 *psk, size_t psk_len);
void wpas_p2p_remove_client(struct wpa_supplicant *wpa_s, const u8 *peer,
int iface_addr);
struct wpabuf * wpas_p2p_nfc_handover_req(struct wpa_supplicant *wpa_s,
int ndef);
struct wpabuf * wpas_p2p_nfc_handover_sel(struct wpa_supplicant *wpa_s,
int ndef, int tag);
#ifdef CONFIG_P2P
int wpas_p2p_4way_hs_failed(struct wpa_supplicant *wpa_s);