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This commit is contained in:
cinap_lenrek 2018-08-06 23:14:59 +02:00
commit 445fc8e5a7
2 changed files with 64 additions and 22 deletions
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77
sys/src/9/port/wifi.c
View file

@ -173,7 +173,7 @@ wifitx(Wifi *wifi, Wnode *wn, Block *b)
uchar *a, *p;
for(a = wn->maxrate, p = wifi->rates; *p; p++){
if(*p < *a && *p > *wn->actrate)
if(*p < *a && *p > *wn->actrate && (wn->validrates & (1UL << p-wifi->rates)) != 0)
a = p;
}
wn->actrate = a;
@ -229,7 +229,7 @@ wifitxfail(Wifi *wifi, Block *b)
uchar *a, *p;
for(a = wn->minrate, p = wifi->rates; *p; p++){
if(*p > *a && *p < *wn->actrate)
if(*p > *a && *p < *wn->actrate && (wn->validrates & (1UL << p-wifi->rates)) != 0)
a = p;
}
wn->actrate = a;
@ -237,25 +237,59 @@ wifitxfail(Wifi *wifi, Block *b)
}
static uchar*
putrates(uchar *p, uchar *rates)
putrates(uchar *p, uchar *rates, ulong valid, ulong basic)
{
int n, m;
int n, i, j;
n = m = strlen((char*)rates);
if(n > 8)
n = 8;
valid |= basic;
for(i = n = 0; i < 32 && rates[i] != 0; i++)
if(valid & (1UL<<i))
n++;
valid &= ~basic;
if(n > 0){
/* supported rates */
*p++ = 1;
*p++ = n;
memmove(p, rates, n);
p += n;
if(m > 8){
for(i = j = 0; j < n; i++){
if(basic & (1UL<<i)){
*p++ = rates[i] | 0x80;
j++;
}
}
for(i = 0; j < n; i++){
if(valid & (1UL<<i)){
*p++ = rates[i] & 0x7f;
j++;
}
}
}
if(n > 8){
/* truncate supported rates element */
p -= n;
p[-1] = 8;
p += 8;
/* extended supported rates */
*p++ = 50;
*p++ = m;
memmove(p, rates, m);
p += m;
*p++ = n;
for(i = j = 0; j < n; i++){
if(basic & (1UL<<i)){
*p++ = rates[i] | 0x80;
j++;
}
}
for(i = 0; j < n; i++){
if(valid & (1UL<<i)){
*p++ = rates[i] & 0x7f;
j++;
}
}
}
return p;
}
@ -289,7 +323,7 @@ wifiprobe(Wifi *wifi, Wnode *wn)
memmove(p, wifi->essid, n);
p += n;
p = putrates(p, wifi->rates);
p = putrates(p, wifi->rates, wn->validrates, wn->basicrates);
*p++ = 3; /* ds parameter set */
*p++ = 1;
@ -363,7 +397,7 @@ sendassoc(Wifi *wifi, Wnode *bss)
memmove(p, bss->ssid, n);
p += n;
p = putrates(p, wifi->rates);
p = putrates(p, wifi->rates, bss->validrates, bss->basicrates);
n = bss->rsnelen;
if(n > 0){
@ -454,12 +488,15 @@ recvbeacon(Wifi *wifi, Wnode *wn, uchar *d, int len)
break;
case 1: /* supported rates */
case 50: /* extended rates */
if(wn->actrate != nil || wifi->rates == nil)
break; /* already set */
if(wifi->rates == nil)
break;
while(d < x){
t = *d++ | 0x80;
t = *d | 0x80;
for(p = wifi->rates; *p != 0; p++){
if(*p == t){
wn->validrates |= 1UL << p-wifi->rates;
if(*d & 0x80)
wn->basicrates |= 1UL << p-wifi->rates;
if(wn->minrate == nil || t < *wn->minrate)
wn->minrate = p;
if(wn->maxrate == nil || t > *wn->maxrate)
@ -467,8 +504,10 @@ recvbeacon(Wifi *wifi, Wnode *wn, uchar *d, int len)
break;
}
}
wn->actrate = wn->maxrate;
d++;
}
if(wn->actrate == nil)
wn->actrate = wn->maxrate;
break;
case 3: /* DSPARAMS */
if(d != x)

3
sys/src/9/port/wifi.h
View file

@ -43,6 +43,9 @@ struct Wnode
uchar *maxrate;
uchar *actrate;
ulong validrates; /* bitmap on wifi->rates */
ulong basicrates;
ulong txcount; /* statistics for rate adaption */
ulong txerror;