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wifi: learn target ip address from neighbor advertisements in dmat proxy

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This commit is contained in:
cinap_lenrek 2018-01-12 18:28:50 +01:00
parent 2088f8c991
commit ba87e58876
1 changed files with 11 additions and 2 deletions
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13
sys/src/9/pc/wifi.c
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@ -1713,7 +1713,7 @@ dmatproxy(Block *bp, int upstream, uchar proxy[Eaddrlen], DMAT *t)
0x06, 0x04,
0x00,
};
uchar ip[IPaddrlen], mac[Eaddrlen], *end, *a, *o;
uchar ip[IPaddrlen], mac[Eaddrlen], *targ, *end, *a, *o;
ulong csum, c, h;
Etherpkt *pkt;
int proto, i;
@ -1730,6 +1730,7 @@ dmatproxy(Block *bp, int upstream, uchar proxy[Eaddrlen], DMAT *t)
else if(t->map == 0 || (pkt->d[0]&1) != 0 || memcmp(pkt->d, proxy, Eaddrlen) != 0)
return;
targ = nil;
switch(pkt->type[0]<<8 | pkt->type[1]){
default:
return;
@ -1768,8 +1769,10 @@ dmatproxy(Block *bp, int upstream, uchar proxy[Eaddrlen], DMAT *t)
case 134: /* Router Advertisement */
o = a+8+8;
break;
case 135: /* Neighbor Solicitation */
case 136: /* Neighbor Advertisement */
targ = a+8;
/* wet floor */
case 135: /* Neighbor Solicitation */
o = a+8+16;
break;
case 137: /* Redirect */
@ -1837,6 +1840,7 @@ dmatproxy(Block *bp, int upstream, uchar proxy[Eaddrlen], DMAT *t)
break;
}
Again:
h = ( (ip[IPaddrlen-1] ^ proxy[2])<<24 |
(ip[IPaddrlen-2] ^ proxy[3])<<16 |
(ip[IPaddrlen-3] ^ proxy[4])<<8 |
@ -1857,6 +1861,11 @@ dmatproxy(Block *bp, int upstream, uchar proxy[Eaddrlen], DMAT *t)
memmove(te->ip, ip, IPaddrlen);
te->valid = 1;
t->map |= 1ULL<<h;
if(targ != nil){
memmove(ip, targ, IPaddrlen);
targ = nil;
goto Again;
}
} else {
if((t->map>>h & 1) == 0)
return;