ref: a87b6909bc209e04a9660b9b2bacea84151fb15d
parent: cf5316a402140556a618a55b59a1d77849a0e35d
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Sun Sep 6 12:51:02 EDT 2020
wifi: add packet timestamping support
--- a/sys/src/9/port/wifi.c
+++ b/sys/src/9/port/wifi.c
@@ -85,6 +85,19 @@
return n;
}
+static uvlong
+getts(uchar *d)
+{+ return (uvlong)d[0] |
+ (uvlong)d[1]<<8 |
+ (uvlong)d[2]<<16 |
+ (uvlong)d[3]<<24 |
+ (uvlong)d[4]<<32 |
+ (uvlong)d[5]<<40 |
+ (uvlong)d[6]<<48 |
+ (uvlong)d[7]<<56;
+}
+
void
wifiiq(Wifi *wifi, Block *b)
{@@ -93,6 +106,8 @@
Etherpkt *e;
int hdrlen;
+ if(b->flag & Btimestamp)
+ assert(b->rp - b->base >= 8);
if(BLEN(b) < WIFIHDRSIZE)
goto drop;
w = (Wifipkt*)b->rp;
@@ -115,6 +130,7 @@
case 0x04: /* control */
break;
case 0x08: /* data */
+ b->flag &= ~Btimestamp;
b->rp += hdrlen;
switch(w->fc[0] & 0xf0){default:
@@ -136,9 +152,7 @@
memmove(e->d, dstaddr(&h), Eaddrlen);
memmove(e->s, srcaddr(&h), Eaddrlen);
memmove(e->type, s.type, 2);
-
dmatproxy(b, 0, wifi->ether->ea, &wifi->dmat);
-
etheriq(wifi->ether, b);
return;
}
@@ -310,6 +324,7 @@
b = allocb(WIFIHDRSIZE + 512);
w = (Wifipkt*)b->wp;
+
w->fc[0] = 0x40; /* probe request */
w->fc[1] = 0x00; /* STA->STA */
memmove(w->a1, wifi->ether->bcast, Eaddrlen); /* ??? */
@@ -377,6 +392,7 @@
memmove(w->a1, bss->bssid, Eaddrlen); /* ??? */
memmove(w->a2, wifi->ether->ea, Eaddrlen);
memmove(w->a3, bss->bssid, Eaddrlen);
+
b->wp += WIFIHDRSIZE;
p = b->wp;
@@ -461,12 +477,17 @@
if(len < 0)
return;
- d += 8; /* timestamp */
+ /* timestamp */
+ wn->ts = getts(d);
+ d += 8;
wn->ival = d[0] | d[1]<<8;
d += 2;
wn->cap = d[0] | d[1]<<8;
d += 2;
+ wn->dtimcount = 0;
+ wn->dtimperiod = 1;
+
rsnset = 0;
for(e = d + len; d+2 <= e; d = x){d += 2;
@@ -513,6 +534,13 @@
if(d != x)
wn->channel = d[0];
break;
+ case 5:
+ if(x - d < 2)
+ break;
+ wn->dtimcount = d[0];
+ if(d[1] > 0)
+ wn->dtimperiod = d[1];
+ break;
case 221: /* vendor specific */
len = x - d;
if(rsnset || len < sizeof(wpa1oui) || memcmp(d, wpa1oui, sizeof(wpa1oui)) != 0)
@@ -619,6 +647,7 @@
w = (Wifipkt*)b->rp;
if(w->fc[1] & 0x40)
continue;
+ b->flag &= ~Btimestamp;
wifiiq(wifi, b);
b = nil;
}
@@ -637,6 +666,8 @@
if((wn = nodelookup(wifi, w->a3, 1)) == nil)
continue;
wn->lastseen = MACHP(0)->ticks;
+ if(b->flag & Btimestamp)
+ wn->rs = getts(b->rp - 8);
b->rp += wifihdrlen(w);
recvbeacon(wifi, wn, b->rp, BLEN(b));
@@ -655,6 +686,8 @@
if((wn = nodelookup(wifi, w->a3, 0)) == nil)
continue;
wn->lastseen = MACHP(0)->ticks;
+ if(b->flag & Btimestamp)
+ wn->rs = getts(b->rp - 8);
switch(w->fc[0] & 0xf0){case 0x10: /* assoc response */
case 0x30: /* reassoc response */
@@ -804,8 +837,9 @@
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);
}
--- a/sys/src/9/port/wifi.h
+++ b/sys/src/9/port/wifi.h
@@ -50,6 +50,10 @@
ulong txerror;
/* stuff from beacon */
+ uvlong rs;
+ uvlong ts;
+ uchar dtimcount;
+ uchar dtimperiod;
int ival;
int cap;
int channel;
@@ -107,6 +111,10 @@
uchar a3[Eaddrlen];
uchar seq[2];
uchar a4[Eaddrlen];
+};
+
+enum {+ Btimestamp = 1<<15,
};
Wifi *wifiattach(Ether *ether, void (*transmit)(Wifi*, Wnode*, Block*));