1 #include <linux/kmod.h>
2 #include <linux/netdevice.h>
3 #include <linux/etherdevice.h>
4 #include <linux/rtnetlink.h>
5 #include <linux/net_tstamp.h>
6 #include <linux/wireless.h>
10 * Map an interface index to its name (SIOCGIFNAME)
14 * We need this ioctl for efficient implementation of the
15 * if_indextoname() function required by the IPv6 API. Without
16 * it, we would have to search all the interfaces to find a
20 static int dev_ifname(struct net *net, struct ifreq __user *arg)
26 * Fetch the caller's info block.
29 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
32 error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
36 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
41 static gifconf_func_t *gifconf_list[NPROTO];
44 * register_gifconf - register a SIOCGIF handler
45 * @family: Address family
46 * @gifconf: Function handler
48 * Register protocol dependent address dumping routines. The handler
49 * that is passed must not be freed or reused until it has been replaced
52 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
56 gifconf_list[family] = gifconf;
59 EXPORT_SYMBOL(register_gifconf);
62 * Perform a SIOCGIFCONF call. This structure will change
63 * size eventually, and there is nothing I can do about it.
64 * Thus we will need a 'compatibility mode'.
67 static int dev_ifconf(struct net *net, char __user *arg)
70 struct net_device *dev;
77 * Fetch the caller's info block.
80 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
87 * Loop over the interfaces, and write an info block for each.
91 for_each_netdev(net, dev) {
92 for (i = 0; i < NPROTO; i++) {
93 if (gifconf_list[i]) {
96 done = gifconf_list[i](dev, NULL, 0);
98 done = gifconf_list[i](dev, pos + total,
108 * All done. Write the updated control block back to the caller.
113 * Both BSD and Solaris return 0 here, so we do too.
115 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
119 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
121 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
124 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
130 case SIOCGIFFLAGS: /* Get interface flags */
131 ifr->ifr_flags = (short) dev_get_flags(dev);
134 case SIOCGIFMETRIC: /* Get the metric on the interface
135 (currently unused) */
139 case SIOCGIFMTU: /* Get the MTU of a device */
140 ifr->ifr_mtu = dev->mtu;
145 memset(ifr->ifr_hwaddr.sa_data, 0,
146 sizeof(ifr->ifr_hwaddr.sa_data));
148 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
149 min(sizeof(ifr->ifr_hwaddr.sa_data),
150 (size_t)dev->addr_len));
151 ifr->ifr_hwaddr.sa_family = dev->type;
159 ifr->ifr_map.mem_start = dev->mem_start;
160 ifr->ifr_map.mem_end = dev->mem_end;
161 ifr->ifr_map.base_addr = dev->base_addr;
162 ifr->ifr_map.irq = dev->irq;
163 ifr->ifr_map.dma = dev->dma;
164 ifr->ifr_map.port = dev->if_port;
168 ifr->ifr_ifindex = dev->ifindex;
172 ifr->ifr_qlen = dev->tx_queue_len;
176 /* dev_ioctl() should ensure this case
187 static int net_hwtstamp_validate(struct ifreq *ifr)
189 struct hwtstamp_config cfg;
190 enum hwtstamp_tx_types tx_type;
191 enum hwtstamp_rx_filters rx_filter;
192 int tx_type_valid = 0;
193 int rx_filter_valid = 0;
195 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
198 if (cfg.flags) /* reserved for future extensions */
201 tx_type = cfg.tx_type;
202 rx_filter = cfg.rx_filter;
205 case HWTSTAMP_TX_OFF:
207 case HWTSTAMP_TX_ONESTEP_SYNC:
213 case HWTSTAMP_FILTER_NONE:
214 case HWTSTAMP_FILTER_ALL:
215 case HWTSTAMP_FILTER_SOME:
216 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
217 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
218 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
219 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
220 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
221 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
222 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
223 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
224 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
225 case HWTSTAMP_FILTER_PTP_V2_EVENT:
226 case HWTSTAMP_FILTER_PTP_V2_SYNC:
227 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
232 if (!tx_type_valid || !rx_filter_valid)
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);
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 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
266 case SIOCSIFHWBROADCAST:
267 if (ifr->ifr_hwaddr.sa_family != dev->type)
269 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
270 min(sizeof(ifr->ifr_hwaddr.sa_data),
271 (size_t)dev->addr_len));
272 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
276 if (ops->ndo_set_config) {
277 if (!netif_device_present(dev))
279 return ops->ndo_set_config(dev, &ifr->ifr_map);
284 if (!ops->ndo_set_rx_mode ||
285 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
287 if (!netif_device_present(dev))
289 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
292 if (!ops->ndo_set_rx_mode ||
293 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
295 if (!netif_device_present(dev))
297 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
300 if (ifr->ifr_qlen < 0)
302 dev->tx_queue_len = ifr->ifr_qlen;
306 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
307 return dev_change_name(dev, ifr->ifr_newname);
310 err = net_hwtstamp_validate(ifr);
316 * Unknown or private ioctl
319 if ((cmd >= SIOCDEVPRIVATE &&
320 cmd <= SIOCDEVPRIVATE + 15) ||
321 cmd == SIOCBONDENSLAVE ||
322 cmd == SIOCBONDRELEASE ||
323 cmd == SIOCBONDSETHWADDR ||
324 cmd == SIOCBONDSLAVEINFOQUERY ||
325 cmd == SIOCBONDINFOQUERY ||
326 cmd == SIOCBONDCHANGEACTIVE ||
327 cmd == SIOCGMIIPHY ||
328 cmd == SIOCGMIIREG ||
329 cmd == SIOCSMIIREG ||
330 cmd == SIOCBRADDIF ||
331 cmd == SIOCBRDELIF ||
332 cmd == SIOCSHWTSTAMP ||
333 cmd == SIOCGHWTSTAMP ||
336 if (ops->ndo_do_ioctl) {
337 if (netif_device_present(dev))
338 err = ops->ndo_do_ioctl(dev, ifr, cmd);
350 * dev_load - load a network module
351 * @net: the applicable net namespace
352 * @name: name of interface
354 * If a network interface is not present and the process has suitable
355 * privileges this function loads the module. If module loading is not
356 * available in this kernel then it becomes a nop.
359 void dev_load(struct net *net, const char *name)
361 struct net_device *dev;
365 dev = dev_get_by_name_rcu(net, name);
369 if (no_module && capable(CAP_NET_ADMIN))
370 no_module = request_module("netdev-%s", name);
371 if (no_module && capable(CAP_SYS_MODULE))
372 request_module("%s", name);
374 EXPORT_SYMBOL(dev_load);
377 * This function handles all "interface"-type I/O control requests. The actual
378 * 'doing' part of this is dev_ifsioc above.
382 * dev_ioctl - network device ioctl
383 * @net: the applicable net namespace
384 * @cmd: command to issue
385 * @arg: pointer to a struct ifreq in user space
387 * Issue ioctl functions to devices. This is normally called by the
388 * user space syscall interfaces but can sometimes be useful for
389 * other purposes. The return value is the return from the syscall if
390 * positive or a negative errno code on error.
393 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
399 /* One special case: SIOCGIFCONF takes ifconf argument
400 and requires shared lock, because it sleeps writing
404 if (cmd == SIOCGIFCONF) {
406 ret = dev_ifconf(net, (char __user *) arg);
410 if (cmd == SIOCGIFNAME)
411 return dev_ifname(net, (struct ifreq __user *)arg);
413 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
416 ifr.ifr_name[IFNAMSIZ-1] = 0;
418 colon = strchr(ifr.ifr_name, ':');
423 * See which interface the caller is talking about.
429 * - can be done by all.
430 * - atomic and do not require locking.
441 dev_load(net, ifr.ifr_name);
443 ret = dev_ifsioc_locked(net, &ifr, cmd);
448 if (copy_to_user(arg, &ifr,
449 sizeof(struct ifreq)))
455 dev_load(net, ifr.ifr_name);
457 ret = dev_ethtool(net, &ifr);
462 if (copy_to_user(arg, &ifr,
463 sizeof(struct ifreq)))
470 * - require superuser power.
471 * - require strict serialization.
477 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
479 dev_load(net, ifr.ifr_name);
481 ret = dev_ifsioc(net, &ifr, cmd);
486 if (copy_to_user(arg, &ifr,
487 sizeof(struct ifreq)))
494 * - require superuser power.
495 * - require strict serialization.
496 * - do not return a value
500 if (!capable(CAP_NET_ADMIN))
505 * - require local superuser power.
506 * - require strict serialization.
507 * - do not return a value
516 case SIOCSIFHWBROADCAST:
518 case SIOCBONDENSLAVE:
519 case SIOCBONDRELEASE:
520 case SIOCBONDSETHWADDR:
521 case SIOCBONDCHANGEACTIVE:
525 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
528 case SIOCBONDSLAVEINFOQUERY:
529 case SIOCBONDINFOQUERY:
530 dev_load(net, ifr.ifr_name);
532 ret = dev_ifsioc(net, &ifr, cmd);
537 /* Get the per device memory space. We can add this but
538 * currently do not support it */
540 /* Set the per device memory buffer space.
541 * Not applicable in our case */
546 * Unknown or private ioctl.
549 if (cmd == SIOCWANDEV ||
550 cmd == SIOCGHWTSTAMP ||
551 (cmd >= SIOCDEVPRIVATE &&
552 cmd <= SIOCDEVPRIVATE + 15)) {
553 dev_load(net, ifr.ifr_name);
555 ret = dev_ifsioc(net, &ifr, cmd);
557 if (!ret && copy_to_user(arg, &ifr,
558 sizeof(struct ifreq)))
562 /* Take care of Wireless Extensions */
563 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
564 return wext_handle_ioctl(net, &ifr, cmd, arg);