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P2P: Add an option to specify group SSID in P2P_CONNECT join case

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The new optional ssid=<hexdump> argument to P2P_CONNECT can be used to
make P2P Client operations during join-an-existing-group more robust by
filtering out scan results based on the SSID in addition to the P2P
Device/Interface Address. This can help if the same MAC address has been
used in multiple groups recently and the cached scan results may still
include an older BSS.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2015-12-30 19:12:38 +02:00 committed by Jouni Malinen
parent 70e0cb33f2
commit 8edd9f1058
2 changed files with 28 additions and 2 deletions
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7
wpa_supplicant/README-P2P
View file

@ -151,6 +151,7 @@ join-a-group style PD instead of GO Negotiation style PD.
p2p_connect <peer device address> <pbc|pin|PIN#|p2ps> [display|keypad|p2ps]
[persistent|persistent=<network id>] [join|auth]
[go_intent=<0..15>] [freq=<in MHz>] [ht40] [vht] [provdisc] [auto]
[ssid=<hexdump>]
Start P2P group formation with a discovered P2P peer. This includes
optional group owner negotiation, group interface setup, provisioning,
@ -195,6 +196,12 @@ connection.
out whether the peer device is operating as a GO and if so, use
join-a-group operation rather than GO Negotiation.
"ssid=<hexdump>" can be used to specify the Group SSID for join
operations. This allows the P2P Client interface to filter scan results
based on SSID to avoid selecting an incorrect BSS entry in case the same
P2P Device or Interface address have been used in multiple groups
recently.
P2PS attribute changes to p2p_connect command:
P2PS supports two WPS provisioning methods namely PIN method and P2PS default.

23
wpa_supplicant/ctrl_iface.c
View file

@ -4911,6 +4911,8 @@ static int p2p_ctrl_connect(struct wpa_supplicant *wpa_s, char *cmd,
int freq = 0;
int pd;
int ht40, vht, max_oper_chwidth, chwidth = 0, freq2 = 0;
u8 _group_ssid[SSID_MAX_LEN], *group_ssid = NULL;
size_t group_ssid_len = 0;
if (!wpa_s->global->p2p_init_wpa_s)
return -1;
@ -4923,7 +4925,7 @@ static int p2p_ctrl_connect(struct wpa_supplicant *wpa_s, char *cmd,
/* <addr> <"pbc" | "pin" | PIN> [label|display|keypad|p2ps]
* [persistent|persistent=<network id>]
* [join] [auth] [go_intent=<0..15>] [freq=<in MHz>] [provdisc]
* [ht40] [vht] [auto] */
* [ht40] [vht] [auto] [ssid=<hexdump>] */
if (hwaddr_aton(cmd, addr))
return -1;
@ -4983,6 +4985,22 @@ static int p2p_ctrl_connect(struct wpa_supplicant *wpa_s, char *cmd,
if (max_oper_chwidth < 0)
return -1;
pos2 = os_strstr(pos, " ssid=");
if (pos2) {
char *end;
pos2 += 6;
end = os_strchr(pos2, ' ');
if (!end)
group_ssid_len = os_strlen(pos2) / 2;
else
group_ssid_len = (end - pos2) / 2;
if (group_ssid_len == 0 || group_ssid_len > SSID_MAX_LEN ||
hexstr2bin(pos2, _group_ssid, group_ssid_len) < 0)
return -1;
group_ssid = _group_ssid;
}
if (os_strncmp(pos, "pin", 3) == 0) {
/* Request random PIN (to be displayed) and enable the PIN */
wps_method = WPS_PIN_DISPLAY;
@ -5008,7 +5026,8 @@ static int p2p_ctrl_connect(struct wpa_supplicant *wpa_s, char *cmd,
new_pin = wpas_p2p_connect(wpa_s, addr, pin, wps_method,
persistent_group, automatic, join,
auth, go_intent, freq, freq2, persistent_id,
pd, ht40, vht, max_oper_chwidth, NULL, 0);
pd, ht40, vht, max_oper_chwidth,
group_ssid, group_ssid_len);
if (new_pin == -2) {
os_memcpy(buf, "FAIL-CHANNEL-UNAVAILABLE\n", 25);
return 25;