1 // SPDX-License-Identifier: GPL-2.0
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>
12 * Map an interface index to its name (SIOCGIFNAME)
16 * We need this ioctl for efficient implementation of the
17 * if_indextoname() function required by the IPv6 API. Without
18 * it, we would have to search all the interfaces to find a
22 static int dev_ifname(struct net *net, struct ifreq *ifr)
24 ifr->ifr_name[IFNAMSIZ-1] = 0;
25 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
28 static gifconf_func_t *gifconf_list[NPROTO];
31 * register_gifconf - register a SIOCGIF handler
32 * @family: Address family
33 * @gifconf: Function handler
35 * Register protocol dependent address dumping routines. The handler
36 * that is passed must not be freed or reused until it has been replaced
39 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
43 gifconf_list[family] = gifconf;
46 EXPORT_SYMBOL(register_gifconf);
49 * Perform a SIOCGIFCONF call. This structure will change
50 * size eventually, and there is nothing I can do about it.
51 * Thus we will need a 'compatibility mode'.
54 int dev_ifconf(struct net *net, struct ifconf *ifc, int size)
56 struct net_device *dev;
63 * Fetch the caller's info block.
70 * Loop over the interfaces, and write an info block for each.
74 for_each_netdev(net, dev) {
75 for (i = 0; i < NPROTO; i++) {
76 if (gifconf_list[i]) {
79 done = gifconf_list[i](dev, NULL, 0, size);
81 done = gifconf_list[i](dev, pos + total,
91 * All done. Write the updated control block back to the caller.
96 * Both BSD and Solaris return 0 here, so we do too.
102 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
104 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
107 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
113 case SIOCGIFFLAGS: /* Get interface flags */
114 ifr->ifr_flags = (short) dev_get_flags(dev);
117 case SIOCGIFMETRIC: /* Get the metric on the interface
118 (currently unused) */
122 case SIOCGIFMTU: /* Get the MTU of a device */
123 ifr->ifr_mtu = dev->mtu;
131 ifr->ifr_map.mem_start = dev->mem_start;
132 ifr->ifr_map.mem_end = dev->mem_end;
133 ifr->ifr_map.base_addr = dev->base_addr;
134 ifr->ifr_map.irq = dev->irq;
135 ifr->ifr_map.dma = dev->dma;
136 ifr->ifr_map.port = dev->if_port;
140 ifr->ifr_ifindex = dev->ifindex;
144 ifr->ifr_qlen = dev->tx_queue_len;
148 /* dev_ioctl() should ensure this case
159 static int net_hwtstamp_validate(struct ifreq *ifr)
161 struct hwtstamp_config cfg;
162 enum hwtstamp_tx_types tx_type;
163 enum hwtstamp_rx_filters rx_filter;
164 int tx_type_valid = 0;
165 int rx_filter_valid = 0;
167 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
170 if (cfg.flags) /* reserved for future extensions */
173 tx_type = cfg.tx_type;
174 rx_filter = cfg.rx_filter;
177 case HWTSTAMP_TX_OFF:
179 case HWTSTAMP_TX_ONESTEP_SYNC:
180 case HWTSTAMP_TX_ONESTEP_P2P:
183 case __HWTSTAMP_TX_CNT:
184 /* not a real value */
189 case HWTSTAMP_FILTER_NONE:
190 case HWTSTAMP_FILTER_ALL:
191 case HWTSTAMP_FILTER_SOME:
192 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
193 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
194 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
195 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
196 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
197 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
198 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
199 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
200 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
201 case HWTSTAMP_FILTER_PTP_V2_EVENT:
202 case HWTSTAMP_FILTER_PTP_V2_SYNC:
203 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
204 case HWTSTAMP_FILTER_NTP_ALL:
207 case __HWTSTAMP_FILTER_CNT:
208 /* not a real value */
212 if (!tx_type_valid || !rx_filter_valid)
218 static int dev_do_ioctl(struct net_device *dev,
219 struct ifreq *ifr, unsigned int cmd)
221 const struct net_device_ops *ops = dev->netdev_ops;
224 err = dsa_ndo_do_ioctl(dev, ifr, cmd);
225 if (err == 0 || err != -EOPNOTSUPP)
228 if (ops->ndo_do_ioctl) {
229 if (netif_device_present(dev))
230 err = ops->ndo_do_ioctl(dev, ifr, cmd);
239 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
241 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
244 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
245 const struct net_device_ops *ops;
250 ops = dev->netdev_ops;
253 case SIOCSIFFLAGS: /* Set interface flags */
254 return dev_change_flags(dev, ifr->ifr_flags, NULL);
256 case SIOCSIFMETRIC: /* Set the metric on the interface
257 (currently unused) */
260 case SIOCSIFMTU: /* Set the MTU of a device */
261 return dev_set_mtu(dev, ifr->ifr_mtu);
264 if (dev->addr_len > sizeof(struct sockaddr))
266 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
268 case SIOCSIFHWBROADCAST:
269 if (ifr->ifr_hwaddr.sa_family != dev->type)
271 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
272 min(sizeof(ifr->ifr_hwaddr.sa_data),
273 (size_t)dev->addr_len));
274 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
278 if (ops->ndo_set_config) {
279 if (!netif_device_present(dev))
281 return ops->ndo_set_config(dev, &ifr->ifr_map);
286 if (!ops->ndo_set_rx_mode ||
287 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
289 if (!netif_device_present(dev))
291 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
294 if (!ops->ndo_set_rx_mode ||
295 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
297 if (!netif_device_present(dev))
299 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
302 if (ifr->ifr_qlen < 0)
304 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
307 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
308 return dev_change_name(dev, ifr->ifr_newname);
311 err = net_hwtstamp_validate(ifr);
317 * Unknown or private ioctl
320 if ((cmd >= SIOCDEVPRIVATE &&
321 cmd <= SIOCDEVPRIVATE + 15) ||
322 cmd == SIOCBONDENSLAVE ||
323 cmd == SIOCBONDRELEASE ||
324 cmd == SIOCBONDSETHWADDR ||
325 cmd == SIOCBONDSLAVEINFOQUERY ||
326 cmd == SIOCBONDINFOQUERY ||
327 cmd == SIOCBONDCHANGEACTIVE ||
328 cmd == SIOCGMIIPHY ||
329 cmd == SIOCGMIIREG ||
330 cmd == SIOCSMIIREG ||
331 cmd == SIOCBRADDIF ||
332 cmd == SIOCBRDELIF ||
333 cmd == SIOCSHWTSTAMP ||
334 cmd == SIOCGHWTSTAMP ||
336 err = dev_do_ioctl(dev, ifr, cmd);
345 * dev_load - load a network module
346 * @net: the applicable net namespace
347 * @name: name of interface
349 * If a network interface is not present and the process has suitable
350 * privileges this function loads the module. If module loading is not
351 * available in this kernel then it becomes a nop.
354 void dev_load(struct net *net, const char *name)
356 struct net_device *dev;
360 dev = dev_get_by_name_rcu(net, name);
364 if (no_module && capable(CAP_NET_ADMIN))
365 no_module = request_module("netdev-%s", name);
366 if (no_module && capable(CAP_SYS_MODULE))
367 request_module("%s", name);
369 EXPORT_SYMBOL(dev_load);
372 * This function handles all "interface"-type I/O control requests. The actual
373 * 'doing' part of this is dev_ifsioc above.
377 * dev_ioctl - network device ioctl
378 * @net: the applicable net namespace
379 * @cmd: command to issue
380 * @ifr: pointer to a struct ifreq in user space
381 * @need_copyout: whether or not copy_to_user() should be called
383 * Issue ioctl functions to devices. This is normally called by the
384 * user space syscall interfaces but can sometimes be useful for
385 * other purposes. The return value is the return from the syscall if
386 * positive or a negative errno code on error.
389 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)
395 *need_copyout = true;
396 if (cmd == SIOCGIFNAME)
397 return dev_ifname(net, ifr);
399 ifr->ifr_name[IFNAMSIZ-1] = 0;
401 colon = strchr(ifr->ifr_name, ':');
406 * See which interface the caller is talking about.
411 dev_load(net, ifr->ifr_name);
412 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
418 * - can be done by all.
419 * - atomic and do not require locking.
429 dev_load(net, ifr->ifr_name);
431 ret = dev_ifsioc_locked(net, ifr, cmd);
438 dev_load(net, ifr->ifr_name);
440 ret = dev_ethtool(net, ifr);
448 * - require superuser power.
449 * - require strict serialization.
455 dev_load(net, ifr->ifr_name);
456 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
459 ret = dev_ifsioc(net, ifr, cmd);
467 * - require superuser power.
468 * - require strict serialization.
469 * - do not return a value
473 if (!capable(CAP_NET_ADMIN))
478 * - require local superuser power.
479 * - require strict serialization.
480 * - do not return a value
489 case SIOCSIFHWBROADCAST:
491 case SIOCBONDENSLAVE:
492 case SIOCBONDRELEASE:
493 case SIOCBONDSETHWADDR:
494 case SIOCBONDCHANGEACTIVE:
498 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
501 case SIOCBONDSLAVEINFOQUERY:
502 case SIOCBONDINFOQUERY:
503 dev_load(net, ifr->ifr_name);
505 ret = dev_ifsioc(net, ifr, cmd);
508 *need_copyout = false;
512 /* Get the per device memory space. We can add this but
513 * currently do not support it */
515 /* Set the per device memory buffer space.
516 * Not applicable in our case */
521 * Unknown or private ioctl.
524 if (cmd == SIOCWANDEV ||
525 cmd == SIOCGHWTSTAMP ||
526 (cmd >= SIOCDEVPRIVATE &&
527 cmd <= SIOCDEVPRIVATE + 15)) {
528 dev_load(net, ifr->ifr_name);
530 ret = dev_ifsioc(net, ifr, cmd);