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wifi: don't try to associate when bypassed

when the interface is bypassed, stop trying to
associate/authenticate to the access point.
just scan and collect beacon statistics.
my asus access point sends spoofed ethernet
frames otherwise on the lan, breaking
ethermultilink.

--- a/sys/src/9/port/wifi.c

+++ b/sys/src/9/port/wifi.c

@@ -601,6 +601,8 @@

 static int

 goodbss(Wifi *wifi, Wnode *wn)

 {

+	if(wifi->ether->bypass)

+		return 0;	/* we'r bypassed, dont try to associate */ 

 	if(memcmp(wifi->bssid, wifi->ether->bcast, Eaddrlen) != 0){

 		if(memcmp(wifi->bssid, wn->bssid, Eaddrlen) != 0)

 			return 0;	/* bssid doesnt match */

@@ -803,7 +805,7 @@

 Scan:

 	/* scan for access point */

 	while(wifi->bss == nil){

-		ether->link = 0;

+		ethersetlink(ether, 0);

 		wnscan.channel = 1 + ((wnscan.channel+4) % 13);

 		wifiprobe(wifi, &wnscan);

 		do {

@@ -819,11 +821,10 @@

 			if((rate = wn->actrate) != nil)

 				ethersetspeed(ether, ((*rate & 0x7f)+3)/4);

 			ethersetlink(ether, 1);

-		} else {

-			ethersetlink(ether, 0);

 		}

 		now = MACHP(0)->ticks;

-		if(wn->status != Sneedauth && TK2SEC(now - wn->lastseen) > 20 || goodbss(wifi, wn) == 0){

+		if(wn->status != Sneedauth && TK2SEC(now - wn->lastseen) > 20

+		|| goodbss(wifi, wn) == 0){

 			wifideauth(wifi, wn);

 			wifi->bss = nil;

 			break;

@@ -833,9 +834,8 @@

 				wifideauth(wifi, wn);	/* stuck in auth, start over */

 			if(wn->status == Sconn || wn->status == Sunauth)

 				sendauth(wifi, wn);

-			if(wn->status == Sauth){

+			if(wn->status == Sauth)

 				sendassoc(wifi, wn);

-			}

 		}

 		tsleep(&up->sleep, return0, 0, 500);

 	}

-- 

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