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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
96b45cbd CW |
2 | #include <linux/kmod.h> |
3 | #include <linux/netdevice.h> | |
4 | #include <linux/etherdevice.h> | |
5 | #include <linux/rtnetlink.h> | |
6 | #include <linux/net_tstamp.h> | |
7 | #include <linux/wireless.h> | |
8 | #include <net/wext.h> | |
9 | ||
10 | /* | |
11 | * Map an interface index to its name (SIOCGIFNAME) | |
12 | */ | |
13 | ||
14 | /* | |
15 | * We need this ioctl for efficient implementation of the | |
16 | * if_indextoname() function required by the IPv6 API. Without | |
17 | * it, we would have to search all the interfaces to find a | |
18 | * match. --pb | |
19 | */ | |
20 | ||
44c02a2c | 21 | static int dev_ifname(struct net *net, struct ifreq *ifr) |
96b45cbd | 22 | { |
44c02a2c AV |
23 | ifr->ifr_name[IFNAMSIZ-1] = 0; |
24 | return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex); | |
96b45cbd CW |
25 | } |
26 | ||
27 | static gifconf_func_t *gifconf_list[NPROTO]; | |
28 | ||
29 | /** | |
30 | * register_gifconf - register a SIOCGIF handler | |
31 | * @family: Address family | |
32 | * @gifconf: Function handler | |
33 | * | |
34 | * Register protocol dependent address dumping routines. The handler | |
35 | * that is passed must not be freed or reused until it has been replaced | |
36 | * by another handler. | |
37 | */ | |
38 | int register_gifconf(unsigned int family, gifconf_func_t *gifconf) | |
39 | { | |
40 | if (family >= NPROTO) | |
41 | return -EINVAL; | |
42 | gifconf_list[family] = gifconf; | |
43 | return 0; | |
44 | } | |
45 | EXPORT_SYMBOL(register_gifconf); | |
46 | ||
47 | /* | |
48 | * Perform a SIOCGIFCONF call. This structure will change | |
49 | * size eventually, and there is nothing I can do about it. | |
50 | * Thus we will need a 'compatibility mode'. | |
51 | */ | |
52 | ||
36fd633e | 53 | int dev_ifconf(struct net *net, struct ifconf *ifc, int size) |
96b45cbd | 54 | { |
96b45cbd CW |
55 | struct net_device *dev; |
56 | char __user *pos; | |
57 | int len; | |
58 | int total; | |
59 | int i; | |
60 | ||
61 | /* | |
62 | * Fetch the caller's info block. | |
63 | */ | |
64 | ||
36fd633e AV |
65 | pos = ifc->ifc_buf; |
66 | len = ifc->ifc_len; | |
96b45cbd CW |
67 | |
68 | /* | |
69 | * Loop over the interfaces, and write an info block for each. | |
70 | */ | |
71 | ||
72 | total = 0; | |
73 | for_each_netdev(net, dev) { | |
74 | for (i = 0; i < NPROTO; i++) { | |
75 | if (gifconf_list[i]) { | |
76 | int done; | |
77 | if (!pos) | |
36fd633e | 78 | done = gifconf_list[i](dev, NULL, 0, size); |
96b45cbd CW |
79 | else |
80 | done = gifconf_list[i](dev, pos + total, | |
36fd633e | 81 | len - total, size); |
96b45cbd CW |
82 | if (done < 0) |
83 | return -EFAULT; | |
84 | total += done; | |
85 | } | |
86 | } | |
87 | } | |
88 | ||
89 | /* | |
90 | * All done. Write the updated control block back to the caller. | |
91 | */ | |
36fd633e | 92 | ifc->ifc_len = total; |
96b45cbd CW |
93 | |
94 | /* | |
95 | * Both BSD and Solaris return 0 here, so we do too. | |
96 | */ | |
36fd633e | 97 | return 0; |
96b45cbd CW |
98 | } |
99 | ||
100 | /* | |
101 | * Perform the SIOCxIFxxx calls, inside rcu_read_lock() | |
102 | */ | |
103 | static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) | |
104 | { | |
105 | int err; | |
106 | struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name); | |
107 | ||
108 | if (!dev) | |
109 | return -ENODEV; | |
110 | ||
111 | switch (cmd) { | |
112 | case SIOCGIFFLAGS: /* Get interface flags */ | |
113 | ifr->ifr_flags = (short) dev_get_flags(dev); | |
114 | return 0; | |
115 | ||
116 | case SIOCGIFMETRIC: /* Get the metric on the interface | |
117 | (currently unused) */ | |
118 | ifr->ifr_metric = 0; | |
119 | return 0; | |
120 | ||
121 | case SIOCGIFMTU: /* Get the MTU of a device */ | |
122 | ifr->ifr_mtu = dev->mtu; | |
123 | return 0; | |
124 | ||
125 | case SIOCGIFHWADDR: | |
126 | if (!dev->addr_len) | |
54aeba7f FF |
127 | memset(ifr->ifr_hwaddr.sa_data, 0, |
128 | sizeof(ifr->ifr_hwaddr.sa_data)); | |
96b45cbd CW |
129 | else |
130 | memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, | |
54aeba7f FF |
131 | min(sizeof(ifr->ifr_hwaddr.sa_data), |
132 | (size_t)dev->addr_len)); | |
96b45cbd CW |
133 | ifr->ifr_hwaddr.sa_family = dev->type; |
134 | return 0; | |
135 | ||
136 | case SIOCGIFSLAVE: | |
137 | err = -EINVAL; | |
138 | break; | |
139 | ||
140 | case SIOCGIFMAP: | |
141 | ifr->ifr_map.mem_start = dev->mem_start; | |
142 | ifr->ifr_map.mem_end = dev->mem_end; | |
143 | ifr->ifr_map.base_addr = dev->base_addr; | |
144 | ifr->ifr_map.irq = dev->irq; | |
145 | ifr->ifr_map.dma = dev->dma; | |
146 | ifr->ifr_map.port = dev->if_port; | |
147 | return 0; | |
148 | ||
149 | case SIOCGIFINDEX: | |
150 | ifr->ifr_ifindex = dev->ifindex; | |
151 | return 0; | |
152 | ||
153 | case SIOCGIFTXQLEN: | |
154 | ifr->ifr_qlen = dev->tx_queue_len; | |
155 | return 0; | |
156 | ||
157 | default: | |
158 | /* dev_ioctl() should ensure this case | |
159 | * is never reached | |
160 | */ | |
161 | WARN_ON(1); | |
162 | err = -ENOTTY; | |
163 | break; | |
164 | ||
165 | } | |
166 | return err; | |
167 | } | |
168 | ||
169 | static int net_hwtstamp_validate(struct ifreq *ifr) | |
170 | { | |
171 | struct hwtstamp_config cfg; | |
172 | enum hwtstamp_tx_types tx_type; | |
173 | enum hwtstamp_rx_filters rx_filter; | |
174 | int tx_type_valid = 0; | |
175 | int rx_filter_valid = 0; | |
176 | ||
177 | if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) | |
178 | return -EFAULT; | |
179 | ||
180 | if (cfg.flags) /* reserved for future extensions */ | |
181 | return -EINVAL; | |
182 | ||
183 | tx_type = cfg.tx_type; | |
184 | rx_filter = cfg.rx_filter; | |
185 | ||
186 | switch (tx_type) { | |
187 | case HWTSTAMP_TX_OFF: | |
188 | case HWTSTAMP_TX_ON: | |
189 | case HWTSTAMP_TX_ONESTEP_SYNC: | |
190 | tx_type_valid = 1; | |
191 | break; | |
192 | } | |
193 | ||
194 | switch (rx_filter) { | |
195 | case HWTSTAMP_FILTER_NONE: | |
196 | case HWTSTAMP_FILTER_ALL: | |
197 | case HWTSTAMP_FILTER_SOME: | |
198 | case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: | |
199 | case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: | |
200 | case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: | |
201 | case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: | |
202 | case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: | |
203 | case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: | |
204 | case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: | |
205 | case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: | |
206 | case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: | |
207 | case HWTSTAMP_FILTER_PTP_V2_EVENT: | |
208 | case HWTSTAMP_FILTER_PTP_V2_SYNC: | |
209 | case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: | |
b8210a9e | 210 | case HWTSTAMP_FILTER_NTP_ALL: |
e3412575 | 211 | rx_filter_valid = 1; |
b8210a9e | 212 | break; |
96b45cbd CW |
213 | } |
214 | ||
215 | if (!tx_type_valid || !rx_filter_valid) | |
216 | return -ERANGE; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Perform the SIOCxIFxxx calls, inside rtnl_lock() | |
223 | */ | |
224 | static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) | |
225 | { | |
226 | int err; | |
227 | struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); | |
228 | const struct net_device_ops *ops; | |
229 | ||
230 | if (!dev) | |
231 | return -ENODEV; | |
232 | ||
233 | ops = dev->netdev_ops; | |
234 | ||
235 | switch (cmd) { | |
236 | case SIOCSIFFLAGS: /* Set interface flags */ | |
567c5e13 | 237 | return dev_change_flags(dev, ifr->ifr_flags, NULL); |
96b45cbd CW |
238 | |
239 | case SIOCSIFMETRIC: /* Set the metric on the interface | |
240 | (currently unused) */ | |
241 | return -EOPNOTSUPP; | |
242 | ||
243 | case SIOCSIFMTU: /* Set the MTU of a device */ | |
244 | return dev_set_mtu(dev, ifr->ifr_mtu); | |
245 | ||
246 | case SIOCSIFHWADDR: | |
0254e0c6 WC |
247 | if (dev->addr_len > sizeof(struct sockaddr)) |
248 | return -EINVAL; | |
3a37a963 | 249 | return dev_set_mac_address(dev, &ifr->ifr_hwaddr, NULL); |
96b45cbd CW |
250 | |
251 | case SIOCSIFHWBROADCAST: | |
252 | if (ifr->ifr_hwaddr.sa_family != dev->type) | |
253 | return -EINVAL; | |
254 | memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, | |
54aeba7f FF |
255 | min(sizeof(ifr->ifr_hwaddr.sa_data), |
256 | (size_t)dev->addr_len)); | |
96b45cbd CW |
257 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
258 | return 0; | |
259 | ||
260 | case SIOCSIFMAP: | |
261 | if (ops->ndo_set_config) { | |
262 | if (!netif_device_present(dev)) | |
263 | return -ENODEV; | |
264 | return ops->ndo_set_config(dev, &ifr->ifr_map); | |
265 | } | |
266 | return -EOPNOTSUPP; | |
267 | ||
268 | case SIOCADDMULTI: | |
269 | if (!ops->ndo_set_rx_mode || | |
270 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
271 | return -EINVAL; | |
272 | if (!netif_device_present(dev)) | |
273 | return -ENODEV; | |
274 | return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); | |
275 | ||
276 | case SIOCDELMULTI: | |
277 | if (!ops->ndo_set_rx_mode || | |
278 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
279 | return -EINVAL; | |
280 | if (!netif_device_present(dev)) | |
281 | return -ENODEV; | |
282 | return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); | |
283 | ||
284 | case SIOCSIFTXQLEN: | |
285 | if (ifr->ifr_qlen < 0) | |
286 | return -EINVAL; | |
8dd30201 | 287 | return dev_change_tx_queue_len(dev, ifr->ifr_qlen); |
96b45cbd CW |
288 | |
289 | case SIOCSIFNAME: | |
290 | ifr->ifr_newname[IFNAMSIZ-1] = '\0'; | |
291 | return dev_change_name(dev, ifr->ifr_newname); | |
292 | ||
293 | case SIOCSHWTSTAMP: | |
294 | err = net_hwtstamp_validate(ifr); | |
295 | if (err) | |
296 | return err; | |
297 | /* fall through */ | |
298 | ||
299 | /* | |
300 | * Unknown or private ioctl | |
301 | */ | |
302 | default: | |
303 | if ((cmd >= SIOCDEVPRIVATE && | |
304 | cmd <= SIOCDEVPRIVATE + 15) || | |
305 | cmd == SIOCBONDENSLAVE || | |
306 | cmd == SIOCBONDRELEASE || | |
307 | cmd == SIOCBONDSETHWADDR || | |
308 | cmd == SIOCBONDSLAVEINFOQUERY || | |
309 | cmd == SIOCBONDINFOQUERY || | |
310 | cmd == SIOCBONDCHANGEACTIVE || | |
311 | cmd == SIOCGMIIPHY || | |
312 | cmd == SIOCGMIIREG || | |
313 | cmd == SIOCSMIIREG || | |
314 | cmd == SIOCBRADDIF || | |
315 | cmd == SIOCBRDELIF || | |
316 | cmd == SIOCSHWTSTAMP || | |
fd468c74 | 317 | cmd == SIOCGHWTSTAMP || |
96b45cbd CW |
318 | cmd == SIOCWANDEV) { |
319 | err = -EOPNOTSUPP; | |
320 | if (ops->ndo_do_ioctl) { | |
321 | if (netif_device_present(dev)) | |
322 | err = ops->ndo_do_ioctl(dev, ifr, cmd); | |
323 | else | |
324 | err = -ENODEV; | |
325 | } | |
326 | } else | |
327 | err = -EINVAL; | |
328 | ||
329 | } | |
330 | return err; | |
331 | } | |
332 | ||
333 | /** | |
334 | * dev_load - load a network module | |
335 | * @net: the applicable net namespace | |
336 | * @name: name of interface | |
337 | * | |
338 | * If a network interface is not present and the process has suitable | |
339 | * privileges this function loads the module. If module loading is not | |
340 | * available in this kernel then it becomes a nop. | |
341 | */ | |
342 | ||
343 | void dev_load(struct net *net, const char *name) | |
344 | { | |
345 | struct net_device *dev; | |
346 | int no_module; | |
347 | ||
348 | rcu_read_lock(); | |
349 | dev = dev_get_by_name_rcu(net, name); | |
350 | rcu_read_unlock(); | |
351 | ||
352 | no_module = !dev; | |
353 | if (no_module && capable(CAP_NET_ADMIN)) | |
354 | no_module = request_module("netdev-%s", name); | |
e020836d DB |
355 | if (no_module && capable(CAP_SYS_MODULE)) |
356 | request_module("%s", name); | |
96b45cbd CW |
357 | } |
358 | EXPORT_SYMBOL(dev_load); | |
359 | ||
360 | /* | |
361 | * This function handles all "interface"-type I/O control requests. The actual | |
362 | * 'doing' part of this is dev_ifsioc above. | |
363 | */ | |
364 | ||
365 | /** | |
366 | * dev_ioctl - network device ioctl | |
367 | * @net: the applicable net namespace | |
368 | * @cmd: command to issue | |
369 | * @arg: pointer to a struct ifreq in user space | |
370 | * | |
371 | * Issue ioctl functions to devices. This is normally called by the | |
372 | * user space syscall interfaces but can sometimes be useful for | |
373 | * other purposes. The return value is the return from the syscall if | |
374 | * positive or a negative errno code on error. | |
375 | */ | |
376 | ||
44c02a2c | 377 | int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout) |
96b45cbd | 378 | { |
96b45cbd CW |
379 | int ret; |
380 | char *colon; | |
381 | ||
44c02a2c AV |
382 | if (need_copyout) |
383 | *need_copyout = true; | |
96b45cbd | 384 | if (cmd == SIOCGIFNAME) |
44c02a2c | 385 | return dev_ifname(net, ifr); |
96b45cbd | 386 | |
44c02a2c | 387 | ifr->ifr_name[IFNAMSIZ-1] = 0; |
96b45cbd | 388 | |
44c02a2c | 389 | colon = strchr(ifr->ifr_name, ':'); |
96b45cbd CW |
390 | if (colon) |
391 | *colon = 0; | |
392 | ||
393 | /* | |
394 | * See which interface the caller is talking about. | |
395 | */ | |
396 | ||
397 | switch (cmd) { | |
398 | /* | |
399 | * These ioctl calls: | |
400 | * - can be done by all. | |
401 | * - atomic and do not require locking. | |
402 | * - return a value | |
403 | */ | |
404 | case SIOCGIFFLAGS: | |
405 | case SIOCGIFMETRIC: | |
406 | case SIOCGIFMTU: | |
407 | case SIOCGIFHWADDR: | |
408 | case SIOCGIFSLAVE: | |
409 | case SIOCGIFMAP: | |
410 | case SIOCGIFINDEX: | |
411 | case SIOCGIFTXQLEN: | |
b51f26b1 | 412 | dev_load(net, ifr->ifr_name); |
96b45cbd | 413 | rcu_read_lock(); |
44c02a2c | 414 | ret = dev_ifsioc_locked(net, ifr, cmd); |
96b45cbd | 415 | rcu_read_unlock(); |
44c02a2c AV |
416 | if (colon) |
417 | *colon = ':'; | |
96b45cbd CW |
418 | return ret; |
419 | ||
420 | case SIOCETHTOOL: | |
b51f26b1 | 421 | dev_load(net, ifr->ifr_name); |
96b45cbd | 422 | rtnl_lock(); |
44c02a2c | 423 | ret = dev_ethtool(net, ifr); |
96b45cbd | 424 | rtnl_unlock(); |
44c02a2c AV |
425 | if (colon) |
426 | *colon = ':'; | |
96b45cbd CW |
427 | return ret; |
428 | ||
429 | /* | |
430 | * These ioctl calls: | |
431 | * - require superuser power. | |
432 | * - require strict serialization. | |
433 | * - return a value | |
434 | */ | |
435 | case SIOCGMIIPHY: | |
436 | case SIOCGMIIREG: | |
437 | case SIOCSIFNAME: | |
b51f26b1 | 438 | dev_load(net, ifr->ifr_name); |
96b45cbd CW |
439 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
440 | return -EPERM; | |
96b45cbd | 441 | rtnl_lock(); |
44c02a2c | 442 | ret = dev_ifsioc(net, ifr, cmd); |
96b45cbd | 443 | rtnl_unlock(); |
44c02a2c AV |
444 | if (colon) |
445 | *colon = ':'; | |
96b45cbd CW |
446 | return ret; |
447 | ||
448 | /* | |
449 | * These ioctl calls: | |
450 | * - require superuser power. | |
451 | * - require strict serialization. | |
452 | * - do not return a value | |
453 | */ | |
454 | case SIOCSIFMAP: | |
455 | case SIOCSIFTXQLEN: | |
456 | if (!capable(CAP_NET_ADMIN)) | |
457 | return -EPERM; | |
458 | /* fall through */ | |
459 | /* | |
460 | * These ioctl calls: | |
461 | * - require local superuser power. | |
462 | * - require strict serialization. | |
463 | * - do not return a value | |
464 | */ | |
465 | case SIOCSIFFLAGS: | |
466 | case SIOCSIFMETRIC: | |
467 | case SIOCSIFMTU: | |
468 | case SIOCSIFHWADDR: | |
469 | case SIOCSIFSLAVE: | |
470 | case SIOCADDMULTI: | |
471 | case SIOCDELMULTI: | |
472 | case SIOCSIFHWBROADCAST: | |
473 | case SIOCSMIIREG: | |
474 | case SIOCBONDENSLAVE: | |
475 | case SIOCBONDRELEASE: | |
476 | case SIOCBONDSETHWADDR: | |
477 | case SIOCBONDCHANGEACTIVE: | |
478 | case SIOCBRADDIF: | |
479 | case SIOCBRDELIF: | |
480 | case SIOCSHWTSTAMP: | |
481 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
482 | return -EPERM; | |
483 | /* fall through */ | |
484 | case SIOCBONDSLAVEINFOQUERY: | |
485 | case SIOCBONDINFOQUERY: | |
b51f26b1 | 486 | dev_load(net, ifr->ifr_name); |
96b45cbd | 487 | rtnl_lock(); |
44c02a2c | 488 | ret = dev_ifsioc(net, ifr, cmd); |
96b45cbd | 489 | rtnl_unlock(); |
44c02a2c AV |
490 | if (need_copyout) |
491 | *need_copyout = false; | |
96b45cbd CW |
492 | return ret; |
493 | ||
494 | case SIOCGIFMEM: | |
495 | /* Get the per device memory space. We can add this but | |
496 | * currently do not support it */ | |
497 | case SIOCSIFMEM: | |
498 | /* Set the per device memory buffer space. | |
499 | * Not applicable in our case */ | |
500 | case SIOCSIFLINK: | |
501 | return -ENOTTY; | |
502 | ||
503 | /* | |
504 | * Unknown or private ioctl. | |
505 | */ | |
506 | default: | |
507 | if (cmd == SIOCWANDEV || | |
fd468c74 | 508 | cmd == SIOCGHWTSTAMP || |
96b45cbd CW |
509 | (cmd >= SIOCDEVPRIVATE && |
510 | cmd <= SIOCDEVPRIVATE + 15)) { | |
b51f26b1 | 511 | dev_load(net, ifr->ifr_name); |
96b45cbd | 512 | rtnl_lock(); |
44c02a2c | 513 | ret = dev_ifsioc(net, ifr, cmd); |
96b45cbd | 514 | rtnl_unlock(); |
96b45cbd CW |
515 | return ret; |
516 | } | |
96b45cbd CW |
517 | return -ENOTTY; |
518 | } | |
519 | } |