1 /* 1 /*
2 * This file implement the Wireless Extensions 2 * This file implement the Wireless Extensions spy API.
3 * 3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hp 4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2007 Jean Tourrilhes, Al 5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
6 * 6 *
7 * (As all part of the Linux kernel, this file 7 * (As all part of the Linux kernel, this file is GPL)
8 */ 8 */
9 9
10 #include <linux/wireless.h> 10 #include <linux/wireless.h>
11 #include <linux/netdevice.h> 11 #include <linux/netdevice.h>
12 #include <linux/etherdevice.h> 12 #include <linux/etherdevice.h>
13 #include <linux/export.h> 13 #include <linux/export.h>
14 #include <net/iw_handler.h> 14 #include <net/iw_handler.h>
15 #include <net/arp.h> 15 #include <net/arp.h>
16 #include <net/wext.h> 16 #include <net/wext.h>
17 17
18 static inline struct iw_spy_data *get_spydata( 18 static inline struct iw_spy_data *get_spydata(struct net_device *dev)
19 { 19 {
20 /* This is the new way */ 20 /* This is the new way */
21 if (dev->wireless_data) 21 if (dev->wireless_data)
22 return dev->wireless_data->spy 22 return dev->wireless_data->spy_data;
23 return NULL; 23 return NULL;
24 } 24 }
25 25
26 int iw_handler_set_spy(struct net_device * 26 int iw_handler_set_spy(struct net_device * dev,
27 struct iw_request_info 27 struct iw_request_info * info,
28 union iwreq_data * 28 union iwreq_data * wrqu,
29 char * 29 char * extra)
30 { 30 {
31 struct iw_spy_data * spydata = get_ 31 struct iw_spy_data * spydata = get_spydata(dev);
32 struct sockaddr * address = (str 32 struct sockaddr * address = (struct sockaddr *) extra;
33 33
34 /* Make sure driver is not buggy or us 34 /* Make sure driver is not buggy or using the old API */
35 if (!spydata) 35 if (!spydata)
36 return -EOPNOTSUPP; 36 return -EOPNOTSUPP;
37 37
38 /* Disable spy collection while we cop 38 /* Disable spy collection while we copy the addresses.
39 * While we copy addresses, any call t 39 * While we copy addresses, any call to wireless_spy_update()
40 * will NOP. This is OK, as anyway the 40 * will NOP. This is OK, as anyway the addresses are changing. */
41 spydata->spy_number = 0; 41 spydata->spy_number = 0;
42 42
43 /* We want to operate without locking, 43 /* We want to operate without locking, because wireless_spy_update()
44 * most likely will happen in the inte 44 * most likely will happen in the interrupt handler, and therefore
45 * have its own locking constraints an 45 * have its own locking constraints and needs performance.
46 * The rtnl_lock() make sure we don't 46 * The rtnl_lock() make sure we don't race with the other iw_handlers.
47 * This make sure wireless_spy_update( 47 * This make sure wireless_spy_update() "see" that the spy list
48 * is temporarily disabled. */ 48 * is temporarily disabled. */
49 smp_wmb(); 49 smp_wmb();
50 50
51 /* Are there are addresses to copy? */ 51 /* Are there are addresses to copy? */
52 if (wrqu->data.length > 0) { 52 if (wrqu->data.length > 0) {
53 int i; 53 int i;
54 54
55 /* Copy addresses */ 55 /* Copy addresses */
56 for (i = 0; i < wrqu->data.len 56 for (i = 0; i < wrqu->data.length; i++)
57 memcpy(spydata->spy_ad 57 memcpy(spydata->spy_address[i], address[i].sa_data,
58 ETH_ALEN); 58 ETH_ALEN);
59 /* Reset stats */ 59 /* Reset stats */
60 memset(spydata->spy_stat, 0, 60 memset(spydata->spy_stat, 0,
61 sizeof(struct iw_qualit 61 sizeof(struct iw_quality) * IW_MAX_SPY);
62 } 62 }
63 63
64 /* Make sure above is updated before r 64 /* Make sure above is updated before re-enabling */
65 smp_wmb(); 65 smp_wmb();
66 66
67 /* Enable addresses */ 67 /* Enable addresses */
68 spydata->spy_number = wrqu->data.lengt 68 spydata->spy_number = wrqu->data.length;
69 69
70 return 0; 70 return 0;
71 } 71 }
72 EXPORT_SYMBOL(iw_handler_set_spy); 72 EXPORT_SYMBOL(iw_handler_set_spy);
73 73
74 int iw_handler_get_spy(struct net_device * 74 int iw_handler_get_spy(struct net_device * dev,
75 struct iw_request_info 75 struct iw_request_info * info,
76 union iwreq_data * 76 union iwreq_data * wrqu,
77 char * 77 char * extra)
78 { 78 {
79 struct iw_spy_data * spydata = get_ 79 struct iw_spy_data * spydata = get_spydata(dev);
80 struct sockaddr * address = (str 80 struct sockaddr * address = (struct sockaddr *) extra;
81 int i; 81 int i;
82 82
83 /* Make sure driver is not buggy or us 83 /* Make sure driver is not buggy or using the old API */
84 if (!spydata) 84 if (!spydata)
85 return -EOPNOTSUPP; 85 return -EOPNOTSUPP;
86 86
87 wrqu->data.length = spydata->spy_numbe 87 wrqu->data.length = spydata->spy_number;
88 88
89 /* Copy addresses. */ 89 /* Copy addresses. */
90 for (i = 0; i < spydata->spy_number; i 90 for (i = 0; i < spydata->spy_number; i++) {
91 memcpy(address[i].sa_data, spy 91 memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
92 address[i].sa_family = AF_UNIX 92 address[i].sa_family = AF_UNIX;
93 } 93 }
94 /* Copy stats to the user buffer (just 94 /* Copy stats to the user buffer (just after). */
95 if (spydata->spy_number > 0) 95 if (spydata->spy_number > 0)
96 memcpy(extra + (sizeof(struct 96 memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
97 spydata->spy_stat, 97 spydata->spy_stat,
98 sizeof(struct iw_qualit 98 sizeof(struct iw_quality) * spydata->spy_number);
99 /* Reset updated flags. */ 99 /* Reset updated flags. */
100 for (i = 0; i < spydata->spy_number; i 100 for (i = 0; i < spydata->spy_number; i++)
101 spydata->spy_stat[i].updated & 101 spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED;
102 return 0; 102 return 0;
103 } 103 }
104 EXPORT_SYMBOL(iw_handler_get_spy); 104 EXPORT_SYMBOL(iw_handler_get_spy);
105 105
106 /*-------------------------------------------- 106 /*------------------------------------------------------------------*/
107 /* 107 /*
108 * Standard Wireless Handler : set spy thresho 108 * Standard Wireless Handler : set spy threshold
109 */ 109 */
110 int iw_handler_set_thrspy(struct net_device * 110 int iw_handler_set_thrspy(struct net_device * dev,
111 struct iw_request_in 111 struct iw_request_info *info,
112 union iwreq_data * 112 union iwreq_data * wrqu,
113 char * 113 char * extra)
114 { 114 {
115 struct iw_spy_data * spydata = get_ 115 struct iw_spy_data * spydata = get_spydata(dev);
116 struct iw_thrspy * threshold = (s 116 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
117 117
118 /* Make sure driver is not buggy or us 118 /* Make sure driver is not buggy or using the old API */
119 if (!spydata) 119 if (!spydata)
120 return -EOPNOTSUPP; 120 return -EOPNOTSUPP;
121 121
122 /* Just do it */ 122 /* Just do it */
123 spydata->spy_thr_low = threshold->low; 123 spydata->spy_thr_low = threshold->low;
124 spydata->spy_thr_high = threshold->hig 124 spydata->spy_thr_high = threshold->high;
125 125
126 /* Clear flag */ 126 /* Clear flag */
127 memset(spydata->spy_thr_under, '\0', s 127 memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
128 128
129 return 0; 129 return 0;
130 } 130 }
131 EXPORT_SYMBOL(iw_handler_set_thrspy); 131 EXPORT_SYMBOL(iw_handler_set_thrspy);
132 132
133 /*-------------------------------------------- 133 /*------------------------------------------------------------------*/
134 /* 134 /*
135 * Standard Wireless Handler : get spy thresho 135 * Standard Wireless Handler : get spy threshold
136 */ 136 */
137 int iw_handler_get_thrspy(struct net_device * 137 int iw_handler_get_thrspy(struct net_device * dev,
138 struct iw_request_in 138 struct iw_request_info *info,
139 union iwreq_data * 139 union iwreq_data * wrqu,
140 char * 140 char * extra)
141 { 141 {
142 struct iw_spy_data * spydata = get_ 142 struct iw_spy_data * spydata = get_spydata(dev);
143 struct iw_thrspy * threshold = (s 143 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
144 144
145 /* Make sure driver is not buggy or us 145 /* Make sure driver is not buggy or using the old API */
146 if (!spydata) 146 if (!spydata)
147 return -EOPNOTSUPP; 147 return -EOPNOTSUPP;
148 148
149 /* Just do it */ 149 /* Just do it */
150 threshold->low = spydata->spy_thr_low; 150 threshold->low = spydata->spy_thr_low;
151 threshold->high = spydata->spy_thr_hig 151 threshold->high = spydata->spy_thr_high;
152 152
153 return 0; 153 return 0;
154 } 154 }
155 EXPORT_SYMBOL(iw_handler_get_thrspy); 155 EXPORT_SYMBOL(iw_handler_get_thrspy);
156 156
157 /*-------------------------------------------- 157 /*------------------------------------------------------------------*/
158 /* 158 /*
159 * Prepare and send a Spy Threshold event 159 * Prepare and send a Spy Threshold event
160 */ 160 */
161 static void iw_send_thrspy_event(struct net_de 161 static void iw_send_thrspy_event(struct net_device * dev,
162 struct iw_spy 162 struct iw_spy_data * spydata,
163 unsigned char 163 unsigned char * address,
164 struct iw_qua 164 struct iw_quality * wstats)
165 { 165 {
166 union iwreq_data wrqu; 166 union iwreq_data wrqu;
167 struct iw_thrspy threshold; 167 struct iw_thrspy threshold;
168 168
169 /* Init */ 169 /* Init */
170 wrqu.data.length = 1; 170 wrqu.data.length = 1;
171 wrqu.data.flags = 0; 171 wrqu.data.flags = 0;
172 /* Copy address */ 172 /* Copy address */
173 memcpy(threshold.addr.sa_data, address 173 memcpy(threshold.addr.sa_data, address, ETH_ALEN);
174 threshold.addr.sa_family = ARPHRD_ETHE 174 threshold.addr.sa_family = ARPHRD_ETHER;
175 /* Copy stats */ 175 /* Copy stats */
176 threshold.qual = *wstats; 176 threshold.qual = *wstats;
177 /* Copy also thresholds */ 177 /* Copy also thresholds */
178 threshold.low = spydata->spy_thr_low; 178 threshold.low = spydata->spy_thr_low;
179 threshold.high = spydata->spy_thr_high 179 threshold.high = spydata->spy_thr_high;
180 180
181 /* Send event to user space */ 181 /* Send event to user space */
182 wireless_send_event(dev, SIOCGIWTHRSPY 182 wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
183 } 183 }
184 184
185 /* ------------------------------------------- 185 /* ---------------------------------------------------------------- */
186 /* 186 /*
187 * Call for the driver to update the spy data. 187 * Call for the driver to update the spy data.
188 * For now, the spy data is a simple array. As 188 * For now, the spy data is a simple array. As the size of the array is
189 * small, this is good enough. If we wanted to 189 * small, this is good enough. If we wanted to support larger number of
190 * spy addresses, we should use something more 190 * spy addresses, we should use something more efficient...
191 */ 191 */
192 void wireless_spy_update(struct net_device * 192 void wireless_spy_update(struct net_device * dev,
193 unsigned char * 193 unsigned char * address,
194 struct iw_quality * 194 struct iw_quality * wstats)
195 { 195 {
196 struct iw_spy_data * spydata = get_ 196 struct iw_spy_data * spydata = get_spydata(dev);
197 int i; 197 int i;
198 int match = -1; 198 int match = -1;
199 199
200 /* Make sure driver is not buggy or us 200 /* Make sure driver is not buggy or using the old API */
201 if (!spydata) 201 if (!spydata)
202 return; 202 return;
203 203
204 /* Update all records that match */ 204 /* Update all records that match */
205 for (i = 0; i < spydata->spy_number; i 205 for (i = 0; i < spydata->spy_number; i++)
206 if (ether_addr_equal(address, 206 if (ether_addr_equal(address, spydata->spy_address[i])) {
207 memcpy(&(spydata->spy_ 207 memcpy(&(spydata->spy_stat[i]), wstats,
208 sizeof(struct i 208 sizeof(struct iw_quality));
209 match = i; 209 match = i;
210 } 210 }
211 211
212 /* Generate an event if we cross the s 212 /* Generate an event if we cross the spy threshold.
213 * To avoid event storms, we have a si 213 * To avoid event storms, we have a simple hysteresis : we generate
214 * event only when we go under the low 214 * event only when we go under the low threshold or above the
215 * high threshold. */ 215 * high threshold. */
216 if (match >= 0) { 216 if (match >= 0) {
217 if (spydata->spy_thr_under[mat 217 if (spydata->spy_thr_under[match]) {
218 if (wstats->level > sp 218 if (wstats->level > spydata->spy_thr_high.level) {
219 spydata->spy_t 219 spydata->spy_thr_under[match] = 0;
220 iw_send_thrspy 220 iw_send_thrspy_event(dev, spydata,
221 221 address, wstats);
222 } 222 }
223 } else { 223 } else {
224 if (wstats->level < sp 224 if (wstats->level < spydata->spy_thr_low.level) {
225 spydata->spy_t 225 spydata->spy_thr_under[match] = 1;
226 iw_send_thrspy 226 iw_send_thrspy_event(dev, spydata,
227 227 address, wstats);
228 } 228 }
229 } 229 }
230 } 230 }
231 } 231 }
232 EXPORT_SYMBOL(wireless_spy_update); 232 EXPORT_SYMBOL(wireless_spy_update);
233 233
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.