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>
11 * Map an interface index to its name (SIOCGIFNAME)
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
21 static int dev_ifname(struct net *net, struct ifreq *ifr)
23 ifr->ifr_name[IFNAMSIZ-1] = 0;
24 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
27 static gifconf_func_t *gifconf_list[NPROTO];
30 * register_gifconf - register a SIOCGIF handler
31 * @family: Address family
32 * @gifconf: Function handler
34 * Register protocol dependent address dumping routines. The handler
35 * that is passed must not be freed or reused until it has been replaced
38 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
42 gifconf_list[family] = gifconf;
45 EXPORT_SYMBOL(register_gifconf);
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'.
53 int dev_ifconf(struct net *net, struct ifconf *ifc, int size)
55 struct net_device *dev;
62 * Fetch the caller's info block.
69 * Loop over the interfaces, and write an info block for each.
73 for_each_netdev(net, dev) {
74 for (i = 0; i < NPROTO; i++) {
75 if (gifconf_list[i]) {
78 done = gifconf_list[i](dev, NULL, 0, size);
80 done = gifconf_list[i](dev, pos + total,
90 * All done. Write the updated control block back to the caller.
95 * Both BSD and Solaris return 0 here, so we do too.
101 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
103 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
106 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
112 case SIOCGIFFLAGS: /* Get interface flags */
113 ifr->ifr_flags = (short) dev_get_flags(dev);
116 case SIOCGIFMETRIC: /* Get the metric on the interface
117 (currently unused) */
121 case SIOCGIFMTU: /* Get the MTU of a device */
122 ifr->ifr_mtu = dev->mtu;
127 memset(ifr->ifr_hwaddr.sa_data, 0,
128 sizeof(ifr->ifr_hwaddr.sa_data));
130 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
131 min(sizeof(ifr->ifr_hwaddr.sa_data),
132 (size_t)dev->addr_len));
133 ifr->ifr_hwaddr.sa_family = dev->type;
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;
150 ifr->ifr_ifindex = dev->ifindex;
154 ifr->ifr_qlen = dev->tx_queue_len;
158 /* dev_ioctl() should ensure this case
169 static int net_hwtstamp_validate(struct ifreq *ifr)
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;
177 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
180 if (cfg.flags) /* reserved for future extensions */
183 tx_type = cfg.tx_type;
184 rx_filter = cfg.rx_filter;
187 case HWTSTAMP_TX_OFF:
189 case HWTSTAMP_TX_ONESTEP_SYNC:
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:
210 case HWTSTAMP_FILTER_NTP_ALL:
215 if (!tx_type_valid || !rx_filter_valid)
222 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
224 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
227 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
228 const struct net_device_ops *ops;
233 ops = dev->netdev_ops;
236 case SIOCSIFFLAGS: /* Set interface flags */
237 return dev_change_flags(dev, ifr->ifr_flags);
239 case SIOCSIFMETRIC: /* Set the metric on the interface
240 (currently unused) */
243 case SIOCSIFMTU: /* Set the MTU of a device */
244 return dev_set_mtu(dev, ifr->ifr_mtu);
247 if (dev->addr_len > sizeof(struct sockaddr))
249 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
251 case SIOCSIFHWBROADCAST:
252 if (ifr->ifr_hwaddr.sa_family != dev->type)
254 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
255 min(sizeof(ifr->ifr_hwaddr.sa_data),
256 (size_t)dev->addr_len));
257 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
261 if (ops->ndo_set_config) {
262 if (!netif_device_present(dev))
264 return ops->ndo_set_config(dev, &ifr->ifr_map);
269 if (!ops->ndo_set_rx_mode ||
270 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
272 if (!netif_device_present(dev))
274 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
277 if (!ops->ndo_set_rx_mode ||
278 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
280 if (!netif_device_present(dev))
282 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
285 if (ifr->ifr_qlen < 0)
287 if (dev->tx_queue_len ^ ifr->ifr_qlen) {
288 err = dev_change_tx_queue_len(dev, ifr->ifr_qlen);
295 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
296 return dev_change_name(dev, ifr->ifr_newname);
299 err = net_hwtstamp_validate(ifr);
305 * Unknown or private ioctl
308 if ((cmd >= SIOCDEVPRIVATE &&
309 cmd <= SIOCDEVPRIVATE + 15) ||
310 cmd == SIOCBONDENSLAVE ||
311 cmd == SIOCBONDRELEASE ||
312 cmd == SIOCBONDSETHWADDR ||
313 cmd == SIOCBONDSLAVEINFOQUERY ||
314 cmd == SIOCBONDINFOQUERY ||
315 cmd == SIOCBONDCHANGEACTIVE ||
316 cmd == SIOCGMIIPHY ||
317 cmd == SIOCGMIIREG ||
318 cmd == SIOCSMIIREG ||
319 cmd == SIOCBRADDIF ||
320 cmd == SIOCBRDELIF ||
321 cmd == SIOCSHWTSTAMP ||
322 cmd == SIOCGHWTSTAMP ||
325 if (ops->ndo_do_ioctl) {
326 if (netif_device_present(dev))
327 err = ops->ndo_do_ioctl(dev, ifr, cmd);
339 * dev_load - load a network module
340 * @net: the applicable net namespace
341 * @name: name of interface
343 * If a network interface is not present and the process has suitable
344 * privileges this function loads the module. If module loading is not
345 * available in this kernel then it becomes a nop.
348 void dev_load(struct net *net, const char *name)
350 struct net_device *dev;
354 dev = dev_get_by_name_rcu(net, name);
358 if (no_module && capable(CAP_NET_ADMIN))
359 no_module = request_module("netdev-%s", name);
360 if (no_module && capable(CAP_SYS_MODULE))
361 request_module("%s", name);
363 EXPORT_SYMBOL(dev_load);
366 * This function handles all "interface"-type I/O control requests. The actual
367 * 'doing' part of this is dev_ifsioc above.
371 * dev_ioctl - network device ioctl
372 * @net: the applicable net namespace
373 * @cmd: command to issue
374 * @arg: pointer to a struct ifreq in user space
376 * Issue ioctl functions to devices. This is normally called by the
377 * user space syscall interfaces but can sometimes be useful for
378 * other purposes. The return value is the return from the syscall if
379 * positive or a negative errno code on error.
382 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)
388 *need_copyout = true;
389 if (cmd == SIOCGIFNAME)
390 return dev_ifname(net, ifr);
392 ifr->ifr_name[IFNAMSIZ-1] = 0;
394 colon = strchr(ifr->ifr_name, ':');
399 * See which interface the caller is talking about.
405 * - can be done by all.
406 * - atomic and do not require locking.
417 dev_load(net, ifr->ifr_name);
419 ret = dev_ifsioc_locked(net, ifr, cmd);
426 dev_load(net, ifr->ifr_name);
428 ret = dev_ethtool(net, ifr);
436 * - require superuser power.
437 * - require strict serialization.
443 dev_load(net, ifr->ifr_name);
444 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
447 ret = dev_ifsioc(net, ifr, cmd);
455 * - require superuser power.
456 * - require strict serialization.
457 * - do not return a value
461 if (!capable(CAP_NET_ADMIN))
466 * - require local superuser power.
467 * - require strict serialization.
468 * - do not return a value
477 case SIOCSIFHWBROADCAST:
479 case SIOCBONDENSLAVE:
480 case SIOCBONDRELEASE:
481 case SIOCBONDSETHWADDR:
482 case SIOCBONDCHANGEACTIVE:
486 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
489 case SIOCBONDSLAVEINFOQUERY:
490 case SIOCBONDINFOQUERY:
491 dev_load(net, ifr->ifr_name);
493 ret = dev_ifsioc(net, ifr, cmd);
496 *need_copyout = false;
500 /* Get the per device memory space. We can add this but
501 * currently do not support it */
503 /* Set the per device memory buffer space.
504 * Not applicable in our case */
509 * Unknown or private ioctl.
512 if (cmd == SIOCWANDEV ||
513 cmd == SIOCGHWTSTAMP ||
514 (cmd >= SIOCDEVPRIVATE &&
515 cmd <= SIOCDEVPRIVATE + 15)) {
516 dev_load(net, ifr->ifr_name);
518 ret = dev_ifsioc(net, ifr, cmd);