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P2P: Automatic channel selection at re-invocation of persistent GO

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If the driver wrapper supports best operation channel indication, the
p2p_group_add command can now use special values (freq=2 and freq=5) to
indicate that the re-invoked persistent GO is to be started on the
specified band.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Wei-Jen Lin 2013-06-05 02:03:26 +03:00 committed by Jouni Malinen
parent 8f395284bd
commit 4abc0424ef
1 changed files with 60 additions and 45 deletions
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105
wpa_supplicant/p2p_supplicant.c
View file

@ -4034,6 +4034,60 @@ int wpas_p2p_group_remove(struct wpa_supplicant *wpa_s, const char *ifname)
}
static int wpas_p2p_select_go_freq(struct wpa_supplicant *wpa_s, int freq)
{
unsigned int r;
if (freq == 2) {
wpa_printf(MSG_DEBUG, "P2P: Request to start GO on 2.4 GHz "
"band");
if (wpa_s->best_24_freq > 0 &&
p2p_supported_freq(wpa_s->global->p2p,
wpa_s->best_24_freq)) {
freq = wpa_s->best_24_freq;
wpa_printf(MSG_DEBUG, "P2P: Use best 2.4 GHz band "
"channel: %d MHz", freq);
} else {
os_get_random((u8 *) &r, sizeof(r));
freq = 2412 + (r % 3) * 25;
wpa_printf(MSG_DEBUG, "P2P: Use random 2.4 GHz band "
"channel: %d MHz", freq);
}
}
if (freq == 5) {
wpa_printf(MSG_DEBUG, "P2P: Request to start GO on 5 GHz "
"band");
if (wpa_s->best_5_freq > 0 &&
p2p_supported_freq(wpa_s->global->p2p,
wpa_s->best_5_freq)) {
freq = wpa_s->best_5_freq;
wpa_printf(MSG_DEBUG, "P2P: Use best 5 GHz band "
"channel: %d MHz", freq);
} else {
os_get_random((u8 *) &r, sizeof(r));
freq = 5180 + (r % 4) * 20;
if (!p2p_supported_freq(wpa_s->global->p2p, freq)) {
wpa_printf(MSG_DEBUG, "P2P: Could not select "
"5 GHz channel for P2P group");
return -1;
}
wpa_printf(MSG_DEBUG, "P2P: Use random 5 GHz band "
"channel: %d MHz", freq);
}
}
if (freq > 0 && !p2p_supported_freq(wpa_s->global->p2p, freq)) {
wpa_printf(MSG_DEBUG, "P2P: The forced channel for GO "
"(%u MHz) is not supported for P2P uses",
freq);
return -1;
}
return freq;
}
static int wpas_p2p_init_go_params(struct wpa_supplicant *wpa_s,
struct p2p_go_neg_results *params,
int freq, int ht40,
@ -4229,7 +4283,6 @@ int wpas_p2p_group_add(struct wpa_supplicant *wpa_s, int persistent_group,
int freq, int ht40)
{
struct p2p_go_neg_results params;
unsigned int r;
if (wpa_s->global->p2p_disabled || wpa_s->global->p2p == NULL)
return -1;
@ -4238,51 +4291,9 @@ int wpas_p2p_group_add(struct wpa_supplicant *wpa_s, int persistent_group,
wpa_printf(MSG_DEBUG, "P2P: Stop any on-going P2P FIND");
wpas_p2p_stop_find_oper(wpa_s);
if (freq == 2) {
wpa_printf(MSG_DEBUG, "P2P: Request to start GO on 2.4 GHz "
"band");
if (wpa_s->best_24_freq > 0 &&
p2p_supported_freq(wpa_s->global->p2p,
wpa_s->best_24_freq)) {
freq = wpa_s->best_24_freq;
wpa_printf(MSG_DEBUG, "P2P: Use best 2.4 GHz band "
"channel: %d MHz", freq);
} else {
os_get_random((u8 *) &r, sizeof(r));
freq = 2412 + (r % 3) * 25;
wpa_printf(MSG_DEBUG, "P2P: Use random 2.4 GHz band "
"channel: %d MHz", freq);
}
}
if (freq == 5) {
wpa_printf(MSG_DEBUG, "P2P: Request to start GO on 5 GHz "
"band");
if (wpa_s->best_5_freq > 0 &&
p2p_supported_freq(wpa_s->global->p2p,
wpa_s->best_5_freq)) {
freq = wpa_s->best_5_freq;
wpa_printf(MSG_DEBUG, "P2P: Use best 5 GHz band "
"channel: %d MHz", freq);
} else {
os_get_random((u8 *) &r, sizeof(r));
freq = 5180 + (r % 4) * 20;
if (!p2p_supported_freq(wpa_s->global->p2p, freq)) {
wpa_printf(MSG_DEBUG, "P2P: Could not select "
"5 GHz channel for P2P group");
freq = wpas_p2p_select_go_freq(wpa_s, freq);
if (freq < 0)
return -1;
}
wpa_printf(MSG_DEBUG, "P2P: Use random 5 GHz band "
"channel: %d MHz", freq);
}
}
if (freq > 0 && !p2p_supported_freq(wpa_s->global->p2p, freq)) {
wpa_printf(MSG_DEBUG, "P2P: The forced channel for GO "
"(%u MHz) is not supported for P2P uses",
freq);
return -1;
}
if (wpas_p2p_init_go_params(wpa_s, &params, freq, ht40, NULL))
return -1;
@ -4378,6 +4389,10 @@ int wpas_p2p_group_add_persistent(struct wpa_supplicant *wpa_s,
if (ssid->mode != WPAS_MODE_P2P_GO)
return -1;
freq = wpas_p2p_select_go_freq(wpa_s, freq);
if (freq < 0)
return -1;
if (wpas_p2p_init_go_params(wpa_s, &params, freq, ht40, channels))
return -1;