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;
130 ifr->ifr_map.mem_start = dev->mem_start;
131 ifr->ifr_map.mem_end = dev->mem_end;
132 ifr->ifr_map.base_addr = dev->base_addr;
133 ifr->ifr_map.irq = dev->irq;
134 ifr->ifr_map.dma = dev->dma;
135 ifr->ifr_map.port = dev->if_port;
139 ifr->ifr_ifindex = dev->ifindex;
143 ifr->ifr_qlen = dev->tx_queue_len;
147 /* dev_ioctl() should ensure this case
158 static int net_hwtstamp_validate(struct ifreq *ifr)
160 struct hwtstamp_config cfg;
161 enum hwtstamp_tx_types tx_type;
162 enum hwtstamp_rx_filters rx_filter;
163 int tx_type_valid = 0;
164 int rx_filter_valid = 0;
166 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
169 if (cfg.flags) /* reserved for future extensions */
172 tx_type = cfg.tx_type;
173 rx_filter = cfg.rx_filter;
176 case HWTSTAMP_TX_OFF:
178 case HWTSTAMP_TX_ONESTEP_SYNC:
184 case HWTSTAMP_FILTER_NONE:
185 case HWTSTAMP_FILTER_ALL:
186 case HWTSTAMP_FILTER_SOME:
187 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
188 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
189 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
190 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
191 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
192 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
193 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
194 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
195 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
196 case HWTSTAMP_FILTER_PTP_V2_EVENT:
197 case HWTSTAMP_FILTER_PTP_V2_SYNC:
198 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
199 case HWTSTAMP_FILTER_NTP_ALL:
204 if (!tx_type_valid || !rx_filter_valid)
211 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
213 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
216 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
217 const struct net_device_ops *ops;
222 ops = dev->netdev_ops;
225 case SIOCSIFFLAGS: /* Set interface flags */
226 return dev_change_flags(dev, ifr->ifr_flags, NULL);
228 case SIOCSIFMETRIC: /* Set the metric on the interface
229 (currently unused) */
232 case SIOCSIFMTU: /* Set the MTU of a device */
233 return dev_set_mtu(dev, ifr->ifr_mtu);
236 if (dev->addr_len > sizeof(struct sockaddr))
238 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
240 case SIOCSIFHWBROADCAST:
241 if (ifr->ifr_hwaddr.sa_family != dev->type)
243 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
244 min(sizeof(ifr->ifr_hwaddr.sa_data),
245 (size_t)dev->addr_len));
246 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
250 if (ops->ndo_set_config) {
251 if (!netif_device_present(dev))
253 return ops->ndo_set_config(dev, &ifr->ifr_map);
258 if (!ops->ndo_set_rx_mode ||
259 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
261 if (!netif_device_present(dev))
263 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
266 if (!ops->ndo_set_rx_mode ||
267 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
269 if (!netif_device_present(dev))
271 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
274 if (ifr->ifr_qlen < 0)
276 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
279 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
280 return dev_change_name(dev, ifr->ifr_newname);
283 err = net_hwtstamp_validate(ifr);
289 * Unknown or private ioctl
292 if ((cmd >= SIOCDEVPRIVATE &&
293 cmd <= SIOCDEVPRIVATE + 15) ||
294 cmd == SIOCBONDENSLAVE ||
295 cmd == SIOCBONDRELEASE ||
296 cmd == SIOCBONDSETHWADDR ||
297 cmd == SIOCBONDSLAVEINFOQUERY ||
298 cmd == SIOCBONDINFOQUERY ||
299 cmd == SIOCBONDCHANGEACTIVE ||
300 cmd == SIOCGMIIPHY ||
301 cmd == SIOCGMIIREG ||
302 cmd == SIOCSMIIREG ||
303 cmd == SIOCBRADDIF ||
304 cmd == SIOCBRDELIF ||
305 cmd == SIOCSHWTSTAMP ||
306 cmd == SIOCGHWTSTAMP ||
309 if (ops->ndo_do_ioctl) {
310 if (netif_device_present(dev))
311 err = ops->ndo_do_ioctl(dev, ifr, cmd);
323 * dev_load - load a network module
324 * @net: the applicable net namespace
325 * @name: name of interface
327 * If a network interface is not present and the process has suitable
328 * privileges this function loads the module. If module loading is not
329 * available in this kernel then it becomes a nop.
332 void dev_load(struct net *net, const char *name)
334 struct net_device *dev;
338 dev = dev_get_by_name_rcu(net, name);
342 if (no_module && capable(CAP_NET_ADMIN))
343 no_module = request_module("netdev-%s", name);
344 if (no_module && capable(CAP_SYS_MODULE))
345 request_module("%s", name);
347 EXPORT_SYMBOL(dev_load);
350 * This function handles all "interface"-type I/O control requests. The actual
351 * 'doing' part of this is dev_ifsioc above.
355 * dev_ioctl - network device ioctl
356 * @net: the applicable net namespace
357 * @cmd: command to issue
358 * @ifr: pointer to a struct ifreq in user space
359 * @need_copyout: whether or not copy_to_user() should be called
361 * Issue ioctl functions to devices. This is normally called by the
362 * user space syscall interfaces but can sometimes be useful for
363 * other purposes. The return value is the return from the syscall if
364 * positive or a negative errno code on error.
367 int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)
373 *need_copyout = true;
374 if (cmd == SIOCGIFNAME)
375 return dev_ifname(net, ifr);
377 ifr->ifr_name[IFNAMSIZ-1] = 0;
379 colon = strchr(ifr->ifr_name, ':');
384 * See which interface the caller is talking about.
389 dev_load(net, ifr->ifr_name);
390 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
396 * - can be done by all.
397 * - atomic and do not require locking.
407 dev_load(net, ifr->ifr_name);
409 ret = dev_ifsioc_locked(net, ifr, cmd);
416 dev_load(net, ifr->ifr_name);
418 ret = dev_ethtool(net, ifr);
426 * - require superuser power.
427 * - require strict serialization.
433 dev_load(net, ifr->ifr_name);
434 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
437 ret = dev_ifsioc(net, ifr, cmd);
445 * - require superuser power.
446 * - require strict serialization.
447 * - do not return a value
451 if (!capable(CAP_NET_ADMIN))
456 * - require local superuser power.
457 * - require strict serialization.
458 * - do not return a value
467 case SIOCSIFHWBROADCAST:
469 case SIOCBONDENSLAVE:
470 case SIOCBONDRELEASE:
471 case SIOCBONDSETHWADDR:
472 case SIOCBONDCHANGEACTIVE:
476 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
479 case SIOCBONDSLAVEINFOQUERY:
480 case SIOCBONDINFOQUERY:
481 dev_load(net, ifr->ifr_name);
483 ret = dev_ifsioc(net, ifr, cmd);
486 *need_copyout = false;
490 /* Get the per device memory space. We can add this but
491 * currently do not support it */
493 /* Set the per device memory buffer space.
494 * Not applicable in our case */
499 * Unknown or private ioctl.
502 if (cmd == SIOCWANDEV ||
503 cmd == SIOCGHWTSTAMP ||
504 (cmd >= SIOCDEVPRIVATE &&
505 cmd <= SIOCDEVPRIVATE + 15)) {
506 dev_load(net, ifr->ifr_name);
508 ret = dev_ifsioc(net, ifr, cmd);