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Commit | Line | Data |
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3d23e349 JB |
1 | /* |
2 | * This file implement the Wireless Extensions spy API. | |
3 | * | |
4 | * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com> | |
5 | * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved. | |
6 | * | |
7 | * (As all part of the Linux kernel, this file is GPL) | |
8 | */ | |
9 | ||
10 | #include <linux/wireless.h> | |
11 | #include <linux/netdevice.h> | |
12 | #include <linux/etherdevice.h> | |
bc3b2d7f | 13 | #include <linux/export.h> |
3d23e349 JB |
14 | #include <net/iw_handler.h> |
15 | #include <net/arp.h> | |
16 | #include <net/wext.h> | |
17 | ||
18 | static inline struct iw_spy_data *get_spydata(struct net_device *dev) | |
19 | { | |
20 | /* This is the new way */ | |
21 | if (dev->wireless_data) | |
22 | return dev->wireless_data->spy_data; | |
23 | return NULL; | |
24 | } | |
25 | ||
26 | int iw_handler_set_spy(struct net_device * dev, | |
27 | struct iw_request_info * info, | |
28 | union iwreq_data * wrqu, | |
29 | char * extra) | |
30 | { | |
31 | struct iw_spy_data * spydata = get_spydata(dev); | |
32 | struct sockaddr * address = (struct sockaddr *) extra; | |
33 | ||
34 | /* Make sure driver is not buggy or using the old API */ | |
35 | if (!spydata) | |
36 | return -EOPNOTSUPP; | |
37 | ||
38 | /* Disable spy collection while we copy the addresses. | |
39 | * While we copy addresses, any call to wireless_spy_update() | |
40 | * will NOP. This is OK, as anyway the addresses are changing. */ | |
41 | spydata->spy_number = 0; | |
42 | ||
43 | /* We want to operate without locking, because wireless_spy_update() | |
44 | * most likely will happen in the interrupt handler, and therefore | |
45 | * have its own locking constraints and needs performance. | |
46 | * The rtnl_lock() make sure we don't race with the other iw_handlers. | |
47 | * This make sure wireless_spy_update() "see" that the spy list | |
48 | * is temporarily disabled. */ | |
49 | smp_wmb(); | |
50 | ||
51 | /* Are there are addresses to copy? */ | |
52 | if (wrqu->data.length > 0) { | |
53 | int i; | |
54 | ||
55 | /* Copy addresses */ | |
56 | for (i = 0; i < wrqu->data.length; i++) | |
57 | memcpy(spydata->spy_address[i], address[i].sa_data, | |
58 | ETH_ALEN); | |
59 | /* Reset stats */ | |
60 | memset(spydata->spy_stat, 0, | |
61 | sizeof(struct iw_quality) * IW_MAX_SPY); | |
62 | } | |
63 | ||
64 | /* Make sure above is updated before re-enabling */ | |
65 | smp_wmb(); | |
66 | ||
67 | /* Enable addresses */ | |
68 | spydata->spy_number = wrqu->data.length; | |
69 | ||
70 | return 0; | |
71 | } | |
72 | EXPORT_SYMBOL(iw_handler_set_spy); | |
73 | ||
74 | int iw_handler_get_spy(struct net_device * dev, | |
75 | struct iw_request_info * info, | |
76 | union iwreq_data * wrqu, | |
77 | char * extra) | |
78 | { | |
79 | struct iw_spy_data * spydata = get_spydata(dev); | |
80 | struct sockaddr * address = (struct sockaddr *) extra; | |
81 | int i; | |
82 | ||
83 | /* Make sure driver is not buggy or using the old API */ | |
84 | if (!spydata) | |
85 | return -EOPNOTSUPP; | |
86 | ||
87 | wrqu->data.length = spydata->spy_number; | |
88 | ||
89 | /* Copy addresses. */ | |
90 | for (i = 0; i < spydata->spy_number; i++) { | |
91 | memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN); | |
92 | address[i].sa_family = AF_UNIX; | |
93 | } | |
94 | /* Copy stats to the user buffer (just after). */ | |
95 | if (spydata->spy_number > 0) | |
96 | memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number), | |
97 | spydata->spy_stat, | |
98 | sizeof(struct iw_quality) * spydata->spy_number); | |
99 | /* Reset updated flags. */ | |
100 | for (i = 0; i < spydata->spy_number; i++) | |
101 | spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED; | |
102 | return 0; | |
103 | } | |
104 | EXPORT_SYMBOL(iw_handler_get_spy); | |
105 | ||
106 | /*------------------------------------------------------------------*/ | |
107 | /* | |
108 | * Standard Wireless Handler : set spy threshold | |
109 | */ | |
110 | int iw_handler_set_thrspy(struct net_device * dev, | |
111 | struct iw_request_info *info, | |
112 | union iwreq_data * wrqu, | |
113 | char * extra) | |
114 | { | |
115 | struct iw_spy_data * spydata = get_spydata(dev); | |
116 | struct iw_thrspy * threshold = (struct iw_thrspy *) extra; | |
117 | ||
118 | /* Make sure driver is not buggy or using the old API */ | |
119 | if (!spydata) | |
120 | return -EOPNOTSUPP; | |
121 | ||
122 | /* Just do it */ | |
123 | memcpy(&(spydata->spy_thr_low), &(threshold->low), | |
124 | 2 * sizeof(struct iw_quality)); | |
125 | ||
126 | /* Clear flag */ | |
127 | memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under)); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | EXPORT_SYMBOL(iw_handler_set_thrspy); | |
132 | ||
133 | /*------------------------------------------------------------------*/ | |
134 | /* | |
135 | * Standard Wireless Handler : get spy threshold | |
136 | */ | |
137 | int iw_handler_get_thrspy(struct net_device * dev, | |
138 | struct iw_request_info *info, | |
139 | union iwreq_data * wrqu, | |
140 | char * extra) | |
141 | { | |
142 | struct iw_spy_data * spydata = get_spydata(dev); | |
143 | struct iw_thrspy * threshold = (struct iw_thrspy *) extra; | |
144 | ||
145 | /* Make sure driver is not buggy or using the old API */ | |
146 | if (!spydata) | |
147 | return -EOPNOTSUPP; | |
148 | ||
149 | /* Just do it */ | |
150 | memcpy(&(threshold->low), &(spydata->spy_thr_low), | |
151 | 2 * sizeof(struct iw_quality)); | |
152 | ||
153 | return 0; | |
154 | } | |
155 | EXPORT_SYMBOL(iw_handler_get_thrspy); | |
156 | ||
157 | /*------------------------------------------------------------------*/ | |
158 | /* | |
159 | * Prepare and send a Spy Threshold event | |
160 | */ | |
161 | static void iw_send_thrspy_event(struct net_device * dev, | |
162 | struct iw_spy_data * spydata, | |
163 | unsigned char * address, | |
164 | struct iw_quality * wstats) | |
165 | { | |
166 | union iwreq_data wrqu; | |
167 | struct iw_thrspy threshold; | |
168 | ||
169 | /* Init */ | |
170 | wrqu.data.length = 1; | |
171 | wrqu.data.flags = 0; | |
172 | /* Copy address */ | |
173 | memcpy(threshold.addr.sa_data, address, ETH_ALEN); | |
174 | threshold.addr.sa_family = ARPHRD_ETHER; | |
175 | /* Copy stats */ | |
176 | memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality)); | |
177 | /* Copy also thresholds */ | |
178 | memcpy(&(threshold.low), &(spydata->spy_thr_low), | |
179 | 2 * sizeof(struct iw_quality)); | |
180 | ||
181 | /* Send event to user space */ | |
182 | wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold); | |
183 | } | |
184 | ||
185 | /* ---------------------------------------------------------------- */ | |
186 | /* | |
187 | * Call for the driver to update the spy data. | |
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 support larger number of | |
190 | * spy addresses, we should use something more efficient... | |
191 | */ | |
192 | void wireless_spy_update(struct net_device * dev, | |
193 | unsigned char * address, | |
194 | struct iw_quality * wstats) | |
195 | { | |
196 | struct iw_spy_data * spydata = get_spydata(dev); | |
197 | int i; | |
198 | int match = -1; | |
199 | ||
200 | /* Make sure driver is not buggy or using the old API */ | |
201 | if (!spydata) | |
202 | return; | |
203 | ||
204 | /* Update all records that match */ | |
205 | for (i = 0; i < spydata->spy_number; i++) | |
ac422d3c | 206 | if (ether_addr_equal(address, spydata->spy_address[i])) { |
3d23e349 JB |
207 | memcpy(&(spydata->spy_stat[i]), wstats, |
208 | sizeof(struct iw_quality)); | |
209 | match = i; | |
210 | } | |
211 | ||
212 | /* Generate an event if we cross the spy threshold. | |
213 | * To avoid event storms, we have a simple hysteresis : we generate | |
214 | * event only when we go under the low threshold or above the | |
215 | * high threshold. */ | |
216 | if (match >= 0) { | |
217 | if (spydata->spy_thr_under[match]) { | |
218 | if (wstats->level > spydata->spy_thr_high.level) { | |
219 | spydata->spy_thr_under[match] = 0; | |
220 | iw_send_thrspy_event(dev, spydata, | |
221 | address, wstats); | |
222 | } | |
223 | } else { | |
224 | if (wstats->level < spydata->spy_thr_low.level) { | |
225 | spydata->spy_thr_under[match] = 1; | |
226 | iw_send_thrspy_event(dev, spydata, | |
227 | address, wstats); | |
228 | } | |
229 | } | |
230 | } | |
231 | } | |
232 | EXPORT_SYMBOL(wireless_spy_update); |