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wifi: signal ap deassociation to aux/wpa with a zero length read.

aux/wpa needs to reset its reply counter on deassociation to
properly restart key negotiation. we signal this with a zero
length read on the connections filtering for eapol protocol.

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

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

@@ -346,6 +346,25 @@

 	}

 }

+/* notify aux/wpa with a zero length write that we got deassociated from the ap */

+static void

+wifideassoc(Wifi *wifi)

+{

+	Ether *ether;

+	Netfile *f;

+	int i;

+

+	ether = wifi->ether;

+	for(i=0; i<ether->nfile; i++){

+		f = ether->f[i];

+		if(f == nil || f->in == nil || f->inuse == 0 || f->type != 0x888e)

+			continue;

+		if(wifi->debug)

+			print("#%d: wifideassoc: %#p\n", ether->ctlrno, f);

+		qwrite(f->in, 0, 0);

+	}

+}

+

 /* check if a node qualifies as our bss matching bssid and essid */

 static int

 goodbss(Wifi *wifi, Wnode *wn)

@@ -429,6 +448,7 @@

 			memset(wn->rxkey, 0, sizeof(wn->rxkey));

 			memset(wn->txkey, 0, sizeof(wn->txkey));

 			wn->aid = 0;

+			wifideassoc(wifi);

 			sendauth(wifi, wn);

 			break;

 		}

-- 

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