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1 | /* |
2 | * This file implement the Wireless Extensions priv API. |
3 | * |
4 | * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com> |
5 | * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved. |
6 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> |
7 | * |
8 | * (As all part of the Linux kernel, this file is GPL) |
9 | */ |
10 | #include <linux/slab.h> |
11 | #include <linux/wireless.h> |
12 | #include <linux/netdevice.h> |
13 | #include <net/iw_handler.h> |
14 | #include <net/wext.h> |
15 | |
16 | int iw_handler_get_private(struct net_device * dev, |
17 | struct iw_request_info * info, |
18 | union iwreq_data * wrqu, |
19 | char * extra) |
20 | { |
21 | /* Check if the driver has something to export */ |
22 | if ((dev->wireless_handlers->num_private_args == 0) || |
23 | (dev->wireless_handlers->private_args == NULL)) |
24 | return -EOPNOTSUPP; |
25 | |
26 | /* Check if there is enough buffer up there */ |
27 | if (wrqu->data.length < dev->wireless_handlers->num_private_args) { |
28 | /* User space can't know in advance how large the buffer |
29 | * needs to be. Give it a hint, so that we can support |
30 | * any size buffer we want somewhat efficiently... */ |
31 | wrqu->data.length = dev->wireless_handlers->num_private_args; |
32 | return -E2BIG; |
33 | } |
34 | |
35 | /* Set the number of available ioctls. */ |
36 | wrqu->data.length = dev->wireless_handlers->num_private_args; |
37 | |
38 | /* Copy structure to the user buffer. */ |
39 | memcpy(extra, dev->wireless_handlers->private_args, |
40 | sizeof(struct iw_priv_args) * wrqu->data.length); |
41 | |
42 | return 0; |
43 | } |
44 | |
45 | /* Size (in bytes) of the various private data types */ |
46 | static const char iw_priv_type_size[] = { |
47 | 0, /* IW_PRIV_TYPE_NONE */ |
48 | 1, /* IW_PRIV_TYPE_BYTE */ |
49 | 1, /* IW_PRIV_TYPE_CHAR */ |
50 | 0, /* Not defined */ |
51 | sizeof(__u32), /* IW_PRIV_TYPE_INT */ |
52 | sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */ |
53 | sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */ |
54 | 0, /* Not defined */ |
55 | }; |
56 | |
57 | static int get_priv_size(__u16 args) |
58 | { |
59 | int num = args & IW_PRIV_SIZE_MASK; |
60 | int type = (args & IW_PRIV_TYPE_MASK) >> 12; |
61 | |
62 | return num * iw_priv_type_size[type]; |
63 | } |
64 | |
65 | static int adjust_priv_size(__u16 args, struct iw_point *iwp) |
66 | { |
67 | int num = iwp->length; |
68 | int max = args & IW_PRIV_SIZE_MASK; |
69 | int type = (args & IW_PRIV_TYPE_MASK) >> 12; |
70 | |
71 | /* Make sure the driver doesn't goof up */ |
72 | if (max < num) |
73 | num = max; |
74 | |
75 | return num * iw_priv_type_size[type]; |
76 | } |
77 | |
78 | /* |
79 | * Wrapper to call a private Wireless Extension handler. |
80 | * We do various checks and also take care of moving data between |
81 | * user space and kernel space. |
82 | * It's not as nice and slimline as the standard wrapper. The cause |
83 | * is struct iw_priv_args, which was not really designed for the |
84 | * job we are going here. |
85 | * |
86 | * IMPORTANT : This function prevent to set and get data on the same |
87 | * IOCTL and enforce the SET/GET convention. Not doing it would be |
88 | * far too hairy... |
89 | * If you need to set and get data at the same time, please don't use |
90 | * a iw_handler but process it in your ioctl handler (i.e. use the |
91 | * old driver API). |
92 | */ |
93 | static int get_priv_descr_and_size(struct net_device *dev, unsigned int cmd, |
94 | const struct iw_priv_args **descrp) |
95 | { |
96 | const struct iw_priv_args *descr; |
97 | int i, extra_size; |
98 | |
99 | descr = NULL; |
100 | for (i = 0; i < dev->wireless_handlers->num_private_args; i++) { |
101 | if (cmd == dev->wireless_handlers->private_args[i].cmd) { |
102 | descr = &dev->wireless_handlers->private_args[i]; |
103 | break; |
104 | } |
105 | } |
106 | |
107 | extra_size = 0; |
108 | if (descr) { |
109 | if (IW_IS_SET(cmd)) { |
110 | int offset = 0; /* For sub-ioctls */ |
111 | /* Check for sub-ioctl handler */ |
112 | if (descr->name[0] == '\0') |
113 | /* Reserve one int for sub-ioctl index */ |
114 | offset = sizeof(__u32); |
115 | |
116 | /* Size of set arguments */ |
117 | extra_size = get_priv_size(descr->set_args); |
118 | |
119 | /* Does it fits in iwr ? */ |
120 | if ((descr->set_args & IW_PRIV_SIZE_FIXED) && |
121 | ((extra_size + offset) <= IFNAMSIZ)) |
122 | extra_size = 0; |
123 | } else { |
124 | /* Size of get arguments */ |
125 | extra_size = get_priv_size(descr->get_args); |
126 | |
127 | /* Does it fits in iwr ? */ |
128 | if ((descr->get_args & IW_PRIV_SIZE_FIXED) && |
129 | (extra_size <= IFNAMSIZ)) |
130 | extra_size = 0; |
131 | } |
132 | } |
133 | *descrp = descr; |
134 | return extra_size; |
135 | } |
136 | |
137 | static int ioctl_private_iw_point(struct iw_point *iwp, unsigned int cmd, |
138 | const struct iw_priv_args *descr, |
139 | iw_handler handler, struct net_device *dev, |
140 | struct iw_request_info *info, int extra_size) |
141 | { |
142 | char *extra; |
143 | int err; |
144 | |
145 | /* Check what user space is giving us */ |
146 | if (IW_IS_SET(cmd)) { |
147 | if (!iwp->pointer && iwp->length != 0) |
148 | return -EFAULT; |
149 | |
150 | if (iwp->length > (descr->set_args & IW_PRIV_SIZE_MASK)) |
151 | return -E2BIG; |
152 | } else if (!iwp->pointer) |
153 | return -EFAULT; |
154 | |
155 | extra = kzalloc(extra_size, GFP_KERNEL); |
156 | if (!extra) |
157 | return -ENOMEM; |
158 | |
159 | /* If it is a SET, get all the extra data in here */ |
160 | if (IW_IS_SET(cmd) && (iwp->length != 0)) { |
161 | if (copy_from_user(extra, iwp->pointer, extra_size)) { |
162 | err = -EFAULT; |
163 | goto out; |
164 | } |
165 | } |
166 | |
167 | /* Call the handler */ |
168 | err = handler(dev, info, (union iwreq_data *) iwp, extra); |
169 | |
170 | /* If we have something to return to the user */ |
171 | if (!err && IW_IS_GET(cmd)) { |
172 | /* Adjust for the actual length if it's variable, |
173 | * avoid leaking kernel bits outside. |
174 | */ |
175 | if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) |
176 | extra_size = adjust_priv_size(descr->get_args, iwp); |
177 | |
178 | if (copy_to_user(iwp->pointer, extra, extra_size)) |
179 | err = -EFAULT; |
180 | } |
181 | |
182 | out: |
183 | kfree(extra); |
184 | return err; |
185 | } |
186 | |
187 | int ioctl_private_call(struct net_device *dev, struct iwreq *iwr, |
188 | unsigned int cmd, struct iw_request_info *info, |
189 | iw_handler handler) |
190 | { |
191 | int extra_size = 0, ret = -EINVAL; |
192 | const struct iw_priv_args *descr; |
193 | |
194 | extra_size = get_priv_descr_and_size(dev, cmd, &descr); |
195 | |
196 | /* Check if we have a pointer to user space data or not. */ |
197 | if (extra_size == 0) { |
198 | /* No extra arguments. Trivial to handle */ |
199 | ret = handler(dev, info, &(iwr->u), (char *) &(iwr->u)); |
200 | } else { |
201 | ret = ioctl_private_iw_point(&iwr->u.data, cmd, descr, |
202 | handler, dev, info, extra_size); |
203 | } |
204 | |
205 | /* Call commit handler if needed and defined */ |
206 | if (ret == -EIWCOMMIT) |
207 | ret = call_commit_handler(dev); |
208 | |
209 | return ret; |
210 | } |
211 | |
212 | #ifdef CONFIG_COMPAT |
213 | int compat_private_call(struct net_device *dev, struct iwreq *iwr, |
214 | unsigned int cmd, struct iw_request_info *info, |
215 | iw_handler handler) |
216 | { |
217 | const struct iw_priv_args *descr; |
218 | int ret, extra_size; |
219 | |
220 | extra_size = get_priv_descr_and_size(dev, cmd, &descr); |
221 | |
222 | /* Check if we have a pointer to user space data or not. */ |
223 | if (extra_size == 0) { |
224 | /* No extra arguments. Trivial to handle */ |
225 | ret = handler(dev, info, &(iwr->u), (char *) &(iwr->u)); |
226 | } else { |
227 | struct compat_iw_point *iwp_compat; |
228 | struct iw_point iwp; |
229 | |
230 | iwp_compat = (struct compat_iw_point *) &iwr->u.data; |
231 | iwp.pointer = compat_ptr(iwp_compat->pointer); |
232 | iwp.length = iwp_compat->length; |
233 | iwp.flags = iwp_compat->flags; |
234 | |
235 | ret = ioctl_private_iw_point(&iwp, cmd, descr, |
236 | handler, dev, info, extra_size); |
237 | |
238 | iwp_compat->pointer = ptr_to_compat(iwp.pointer); |
239 | iwp_compat->length = iwp.length; |
240 | iwp_compat->flags = iwp.flags; |
241 | } |
242 | |
243 | /* Call commit handler if needed and defined */ |
244 | if (ret == -EIWCOMMIT) |
245 | ret = call_commit_handler(dev); |
246 | |
247 | return ret; |
248 | } |
249 | #endif |
250 |
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