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P2P: Allow multiple scan runs to find GO for p2p_connect join 

If the GO is not found, we cannot send Provisioning Discovery Request
frame and cannot really connect anyway. Since the Provisioning
Discovery is a mandatory part, it is better to continue join-scan
until the GO is found instead of moving to the next step where
normal connection scan is used (PD would not be used from there).

Use a limit of 10 scan attempts for p2p_connect join to avoid getting
in infinite loop trying to join. If the GO is not found with those
scans, indicate failure (P2P-GROUP-FORMATION-FAILURE) and stop the
join attempt.
This commit is contained in:
Jouni Malinen 2010-11-15 16:15:38 +02:00 committed by Jouni Malinen
parent e8ecb5fb49
commit 9b1ab931b1
2 changed files with 31 additions and 2 deletions
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32
wpa_supplicant/p2p_supplicant.c
View File

@ -36,6 +36,13 @@
#include "p2p_supplicant.h"
/*
* How many times to try to scan to find the GO before giving up on join
* request.
*/
#define P2P_MAX_JOIN_SCAN_ATTEMPTS 10
static void wpas_p2p_long_listen_timeout(void *eloop_ctx, void *timeout_ctx);
static struct wpa_supplicant *
wpas_p2p_get_group_iface(struct wpa_supplicant *wpa_s, int addr_allocated,
@ -2413,6 +2420,22 @@ static int wpas_p2p_auth_go_neg(struct wpa_supplicant *wpa_s,
}
static void wpas_p2p_check_join_scan_limit(struct wpa_supplicant *wpa_s)
{
wpa_s->p2p_join_scan_count++;
wpa_printf(MSG_DEBUG, "P2P: Join scan attempt %d",
wpa_s->p2p_join_scan_count);
if (wpa_s->p2p_join_scan_count > P2P_MAX_JOIN_SCAN_ATTEMPTS) {
wpa_printf(MSG_DEBUG, "P2P: Failed to find GO " MACSTR
" for join operationg - stop join attempt",
MAC2STR(wpa_s->pending_join_iface_addr));
eloop_cancel_timeout(wpas_p2p_join_scan, wpa_s, NULL);
wpa_msg(wpa_s->parent, MSG_INFO,
P2P_EVENT_GROUP_FORMATION_FAILURE);
}
}
static void wpas_p2p_scan_res_join(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res)
{
@ -2484,8 +2507,11 @@ static void wpas_p2p_scan_res_join(struct wpa_supplicant *wpa_s,
return;
}
wpa_printf(MSG_DEBUG, "P2P: Target BSS/GO not yet in BSS table - "
"cannot send Provision Discovery Request");
wpa_printf(MSG_DEBUG, "P2P: Failed to find BSS/GO - try again later");
eloop_cancel_timeout(wpas_p2p_join_scan, wpa_s, NULL);
eloop_register_timeout(1, 0, wpas_p2p_join_scan, wpa_s, NULL);
wpas_p2p_check_join_scan_limit(wpa_s);
return;
start:
/* Start join operation immediately */
@ -2546,6 +2572,7 @@ static void wpas_p2p_join_scan(void *eloop_ctx, void *timeout_ctx)
"try again later");
eloop_cancel_timeout(wpas_p2p_join_scan, wpa_s, NULL);
eloop_register_timeout(1, 0, wpas_p2p_join_scan, wpa_s, NULL);
wpas_p2p_check_join_scan_limit(wpa_s);
}
}
@ -2564,6 +2591,7 @@ static int wpas_p2p_join(struct wpa_supplicant *wpa_s, const u8 *iface_addr,
/* Make sure we are not running find during connection establishment */
wpas_p2p_stop_find(wpa_s);
wpa_s->p2p_join_scan_count = 0;
wpas_p2p_join_scan(wpa_s, NULL);
return 0;
}

1
wpa_supplicant/wpa_supplicant_i.h
View File

@ -492,6 +492,7 @@ struct wpa_supplicant {
u8 pending_join_iface_addr[ETH_ALEN];
u8 pending_join_dev_addr[ETH_ALEN];
int pending_join_wps_method;
int p2p_join_scan_count;
unsigned int roc_waiting_drv_freq;
int force_long_sd;