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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
/* Helpers for managing scan queues
*
* See copyright notice in main.c
*/
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ieee80211.h>
#include <net/cfg80211.h>
#include "hermes.h"
#include "orinoco.h"
#include "main.h"
#include "scan.h"
#define ZERO_DBM_OFFSET 0x95
#define MAX_SIGNAL_LEVEL 0x8A
#define MIN_SIGNAL_LEVEL 0x2F
#define SIGNAL_TO_DBM(x) \
(clamp_t(s32, (x), MIN_SIGNAL_LEVEL, MAX_SIGNAL_LEVEL) \
- ZERO_DBM_OFFSET)
#define SIGNAL_TO_MBM(x) (SIGNAL_TO_DBM(x) * 100)
static int symbol_build_supp_rates(u8 *buf, const __le16 *rates)
{
int i;
u8 rate;
buf[0] = WLAN_EID_SUPP_RATES;
for (i = 0; i < 5; i++) {
rate = le16_to_cpu(rates[i]);
/* NULL terminated */
if (rate == 0x0)
break;
buf[i + 2] = rate;
}
buf[1] = i;
return i + 2;
}
static int prism_build_supp_rates(u8 *buf, const u8 *rates)
{
int i;
buf[0] = WLAN_EID_SUPP_RATES;
for (i = 0; i < 8; i++) {
/* NULL terminated */
if (rates[i] == 0x0)
break;
buf[i + 2] = rates[i];
}
buf[1] = i;
/* We might still have another 2 rates, which need to go in
* extended supported rates */
if (i == 8 && rates[i] > 0) {
buf[10] = WLAN_EID_EXT_SUPP_RATES;
for (; i < 10; i++) {
/* NULL terminated */
if (rates[i] == 0x0)
break;
buf[i + 2] = rates[i];
}
buf[11] = i - 8;
}
return (i < 8) ? i + 2 : i + 4;
}
static void orinoco_add_hostscan_result(struct orinoco_private *priv,
const union hermes_scan_info *bss)
{
struct wiphy *wiphy = priv_to_wiphy(priv);
struct ieee80211_channel *channel;
u8 *ie;
u8 ie_buf[46];
u64 timestamp;
s32 signal;
u16 capability;
u16 beacon_interval;
int ie_len;
int freq;
int len;
len = le16_to_cpu(bss->a.essid_len);
/* Reconstruct SSID and bitrate IEs to pass up */
ie_buf[0] = WLAN_EID_SSID;
ie_buf[1] = len;
memcpy(&ie_buf[2], bss->a.essid, len);
ie = ie_buf + len + 2;
ie_len = ie_buf[1] + 2;
switch (priv->firmware_type) {
case FIRMWARE_TYPE_SYMBOL:
ie_len += symbol_build_supp_rates(ie, bss->s.rates);
break;
case FIRMWARE_TYPE_INTERSIL:
ie_len += prism_build_supp_rates(ie, bss->p.rates);
break;
case FIRMWARE_TYPE_AGERE:
default:
break;
}
freq = ieee80211_dsss_chan_to_freq(le16_to_cpu(bss->a.channel));
channel = ieee80211_get_channel(wiphy, freq);
timestamp = 0;
capability = le16_to_cpu(bss->a.capabilities);
beacon_interval = le16_to_cpu(bss->a.beacon_interv);
signal = SIGNAL_TO_MBM(le16_to_cpu(bss->a.level));
cfg80211_inform_bss(wiphy, channel, bss->a.bssid, timestamp,
capability, beacon_interval, ie_buf, ie_len,
signal, GFP_KERNEL);
}
void orinoco_add_extscan_result(struct orinoco_private *priv,
struct agere_ext_scan_info *bss,
size_t len)
{
struct wiphy *wiphy = priv_to_wiphy(priv);
struct ieee80211_channel *channel;
u8 *ie;
u64 timestamp;
s32 signal;
u16 capability;
u16 beacon_interval;
size_t ie_len;
int chan, freq;
ie_len = len - sizeof(*bss);
ie = orinoco_get_ie(bss->data, ie_len, WLAN_EID_DS_PARAMS);
chan = ie ? ie[2] : 0;
freq = ieee80211_dsss_chan_to_freq(chan);
channel = ieee80211_get_channel(wiphy, freq);
timestamp = le64_to_cpu(bss->timestamp);
capability = le16_to_cpu(bss->capabilities);
beacon_interval = le16_to_cpu(bss->beacon_interval);
ie = bss->data;
signal = SIGNAL_TO_MBM(bss->level);
cfg80211_inform_bss(wiphy, channel, bss->bssid, timestamp,
capability, beacon_interval, ie, ie_len,
signal, GFP_KERNEL);
}
void orinoco_add_hostscan_results(struct orinoco_private *priv,
unsigned char *buf,
size_t len)
{
int offset; /* In the scan data */
size_t atom_len;
bool abort = false;
switch (priv->firmware_type) {
case FIRMWARE_TYPE_AGERE:
atom_len = sizeof(struct agere_scan_apinfo);
offset = 0;
break;
case FIRMWARE_TYPE_SYMBOL:
/* Lack of documentation necessitates this hack.
* Different firmwares have 68 or 76 byte long atoms.
* We try modulo first. If the length divides by both,
* we check what would be the channel in the second
* frame for a 68-byte atom. 76-byte atoms have 0 there.
* Valid channel cannot be 0. */
if (len % 76)
atom_len = 68;
else if (len % 68)
atom_len = 76;
else if (len >= 1292 && buf[68] == 0)
atom_len = 76;
else
atom_len = 68;
offset = 0;
break;
case FIRMWARE_TYPE_INTERSIL:
offset = 4;
if (priv->has_hostscan) {
atom_len = le16_to_cpup((__le16 *)buf);
/* Sanity check for atom_len */
if (atom_len < sizeof(struct prism2_scan_apinfo)) {
printk(KERN_ERR "%s: Invalid atom_len in scan "
"data: %zu\n", priv->ndev->name,
atom_len);
abort = true;
goto scan_abort;
}
} else
atom_len = offsetof(struct prism2_scan_apinfo, atim);
break;
default:
abort = true;
goto scan_abort;
}
/* Check that we got an whole number of atoms */
if ((len - offset) % atom_len) {
printk(KERN_ERR "%s: Unexpected scan data length %zu, "
"atom_len %zu, offset %d\n", priv->ndev->name, len,
atom_len, offset);
abort = true;
goto scan_abort;
}
/* Process the entries one by one */
for (; offset + atom_len <= len; offset += atom_len) {
union hermes_scan_info *atom;
atom = (union hermes_scan_info *) (buf + offset);
orinoco_add_hostscan_result(priv, atom);
}
scan_abort:
if (priv->scan_request) {
cfg80211_scan_done(priv->scan_request, abort);
priv->scan_request = NULL;
}
}
|
