1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
#include <u.h>
#include <libc.h>
#include <thread.h>
#include "usb.h"
#include "dat.h"
static uchar minit[24] = {
2, 0, 0, 0, /* type = 2 (init) */
24, 0, 0, 0, /* len = 24 */
0, 0, 0, 0, /* rid = 1 */
1, 0, 0, 0, /* vmajor = 1 */
1, 0, 0, 0, /* vminor = 1 */
0, 0, 0, 0, /* max xfer */
};
static uchar mgetmac[28] = {
4, 0, 0, 0, /* type = 4 (query) */
28, 0, 0, 0, /* len = 28 */
0, 0, 0, 0, /* rid = 2 */
1, 1, 1, 1, /* oid = get "permanent address" */
0, 0, 0, 0, /* buflen = 0 */
0, 0, 0, 0, /* bufoff = 0 */
0, 0, 0, 0, /* reserved = 0 */
};
static uchar mfilter[32] = {
5, 0, 0, 0, /* type = 5 (set) */
32, 0, 0, 0, /* len = 32 */
0, 0, 0, 0, /* rid = 3 */
14, 1, 1, 0, /* oid = "current filter" */
4, 0, 0, 0, /* buflen = 4 */
20, 0, 0, 0, /* bufoff = 20 (8+20=28) */
0, 0, 0, 0, /* reserved = 0 */
12, 0, 0, 0, /* filter = all multicast + broadcast */
};
static int
rndisout(Dev *d, int id, uchar *msg, int sz)
{
return usbcmd(d, Rh2d|Rclass|Riface, Rgetstatus, 0, id, msg, sz);
}
static int
rndisin(Dev *d, int id, uchar *buf, int sz)
{
int r, status;
for(;;){
if((r = usbcmd(d, Rd2h|Rclass|Riface, Rclearfeature, 0, id, buf, sz)) >= 16){
if((status = GET4(buf+12)) != 0){
werrstr("status 0x%02x", status);
r = -1;
}else if(GET4(buf) == 7) /* ignore status messages */
continue;
}else if(r > 0){
werrstr("short recv: %d", r);
r = -1;
}
break;
}
return r;
}
static int
rndisreceive(Dev *ep)
{
Block *b;
int n, len;
int doff, dlen;
b = allocb(Maxpkt);
if((n = read(ep->dfd, b->rp, b->lim - b->base)) >= 0){
if(n < 44)
werrstr("short packet: %d bytes", n);
else if(GET4(b->rp) != 1)
werrstr("not a network packet: type 0x%08ux", GET4(b->wp));
else{
doff = GET4(b->rp+8);
dlen = GET4(b->rp+12);
if((len = GET4(b->rp+4)) != n || 8+doff+dlen > len || dlen < Ehdrsz)
werrstr("bad packet: doff %d, dlen %d, len %d", doff, dlen, len);
else{
b->rp += 8 + doff;
b->wp = b->rp + dlen;
etheriq(b, 1);
return 0;
}
}
}
freeb(b);
return -1;
}
static void
rndistransmit(Dev *ep, Block *b)
{
int n;
n = BLEN(b);
b->rp -= 44;
PUT4(b->rp, 1); /* type = 1 (packet) */
PUT4(b->rp+4, 44+n); /* len */
PUT4(b->rp+8, 44-8); /* data offset */
PUT4(b->rp+12, n); /* data length */
memset(b->rp+16, 0, 7*4);
write(ep->dfd, b->rp, 44+n);
freeb(b);
}
int
rndisinit(Dev *d)
{
uchar res[128];
int r, i, off, sz;
Ep *ep;
r = 0;
for(i = 0; i < nelem(d->usb->ep); i++){
if((ep = d->usb->ep[i]) == nil)
continue;
if(ep->iface->csp == 0x000301e0)
r = 1;
}
if(!r){
werrstr("no rndis found");
return -1;
}
/* initialize */
PUT4(minit+20, 1580); /* max xfer = 1580 */
if(rndisout(d, 0, minit, sizeof(minit)) < 0)
werrstr("init: %r");
else if((r = rndisin(d, 0, res, sizeof(res))) < 0)
werrstr("init: %r");
else if(GET4(res) != 0x80000002 || r < 52)
werrstr("not an init response: type 0x%08ux, len %d", GET4(res), r);
/* check the type */
else if((r = GET4(res+24)) != 1)
werrstr("not a connectionless device: %d", r);
else if((r = GET4(res+28)) != 0)
werrstr("not a 802.3 device: %d", r);
else{
/* get mac address */
if(rndisout(d, 0, mgetmac, sizeof(mgetmac)) < 0)
werrstr("send getmac: %r");
else if((r = rndisin(d, 0, res, sizeof(res))) < 0)
werrstr("recv getmac: %r");
else if(GET4(res) != 0x80000004 || r < 24)
werrstr("not a query response: type 0x%08ux, len %d", GET4(res), r);
else {
sz = GET4(res+16);
off = GET4(res+20);
if(8+off+sz > r || sz != 6)
werrstr("invalid mac: off %d, sz %d, len %d", off, sz, r);
else{
memcpy(macaddr, res+8+off, 6);
/* set the filter */
if(rndisout(d, 0, mfilter, sizeof(mfilter)) < 0)
werrstr("send filter: %r");
else if(rndisin(d, 0, res, sizeof(res)) < 0)
werrstr("recv filter: %r");
else if(GET4(res) != 0x80000005)
werrstr("not a filter response: type 0x%08ux", GET4(res));
else{
epreceive = rndisreceive;
eptransmit = rndistransmit;
return 0;
}
}
}
}
return -1;
}
|
