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:
228 case HWTSTAMP_FILTER_NTP_ALL:
233 if (!tx_type_valid || !rx_filter_valid)
240 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
242 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
245 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
246 const struct net_device_ops *ops;
251 ops = dev->netdev_ops;
254 case SIOCSIFFLAGS: /* Set interface flags */
255 return dev_change_flags(dev, ifr->ifr_flags);
257 case SIOCSIFMETRIC: /* Set the metric on the interface
258 (currently unused) */
261 case SIOCSIFMTU: /* Set the MTU of a device */
262 return dev_set_mtu(dev, ifr->ifr_mtu);
265 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
267 case SIOCSIFHWBROADCAST:
268 if (ifr->ifr_hwaddr.sa_family != dev->type)
270 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
271 min(sizeof(ifr->ifr_hwaddr.sa_data),
272 (size_t)dev->addr_len));
273 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
277 if (ops->ndo_set_config) {
278 if (!netif_device_present(dev))
280 return ops->ndo_set_config(dev, &ifr->ifr_map);
285 if (!ops->ndo_set_rx_mode ||
286 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
288 if (!netif_device_present(dev))
290 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
293 if (!ops->ndo_set_rx_mode ||
294 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
296 if (!netif_device_present(dev))
298 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
301 if (ifr->ifr_qlen < 0)
303 dev->tx_queue_len = 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 ||
337 if (ops->ndo_do_ioctl) {
338 if (netif_device_present(dev))
339 err = ops->ndo_do_ioctl(dev, ifr, cmd);
351 * dev_load - load a network module
352 * @net: the applicable net namespace
353 * @name: name of interface
355 * If a network interface is not present and the process has suitable
356 * privileges this function loads the module. If module loading is not
357 * available in this kernel then it becomes a nop.
360 void dev_load(struct net *net, const char *name)
362 struct net_device *dev;
366 dev = dev_get_by_name_rcu(net, name);
370 if (no_module && capable(CAP_NET_ADMIN))
371 no_module = request_module("netdev-%s", name);
372 if (no_module && capable(CAP_SYS_MODULE))
373 request_module("%s", name);
375 EXPORT_SYMBOL(dev_load);
378 * This function handles all "interface"-type I/O control requests. The actual
379 * 'doing' part of this is dev_ifsioc above.
383 * dev_ioctl - network device ioctl
384 * @net: the applicable net namespace
385 * @cmd: command to issue
386 * @arg: pointer to a struct ifreq in user space
388 * Issue ioctl functions to devices. This is normally called by the
389 * user space syscall interfaces but can sometimes be useful for
390 * other purposes. The return value is the return from the syscall if
391 * positive or a negative errno code on error.
394 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
400 /* One special case: SIOCGIFCONF takes ifconf argument
401 and requires shared lock, because it sleeps writing
405 if (cmd == SIOCGIFCONF) {
407 ret = dev_ifconf(net, (char __user *) arg);
411 if (cmd == SIOCGIFNAME)
412 return dev_ifname(net, (struct ifreq __user *)arg);
415 * Take care of Wireless Extensions. Unfortunately struct iwreq
416 * isn't a proper subset of struct ifreq (it's 8 byte shorter)
417 * so we need to treat it specially, otherwise applications may
418 * fault if the struct they're passing happens to land at the
419 * end of a mapped page.
421 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
424 if (copy_from_user(&iwr, arg, sizeof(iwr)))
427 return wext_handle_ioctl(net, &iwr, cmd, arg);
430 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
433 ifr.ifr_name[IFNAMSIZ-1] = 0;
435 colon = strchr(ifr.ifr_name, ':');
440 * See which interface the caller is talking about.
446 * - can be done by all.
447 * - atomic and do not require locking.
458 dev_load(net, ifr.ifr_name);
460 ret = dev_ifsioc_locked(net, &ifr, cmd);
465 if (copy_to_user(arg, &ifr,
466 sizeof(struct ifreq)))
472 dev_load(net, ifr.ifr_name);
474 ret = dev_ethtool(net, &ifr);
479 if (copy_to_user(arg, &ifr,
480 sizeof(struct ifreq)))
487 * - require superuser power.
488 * - require strict serialization.
494 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
496 dev_load(net, ifr.ifr_name);
498 ret = dev_ifsioc(net, &ifr, cmd);
503 if (copy_to_user(arg, &ifr,
504 sizeof(struct ifreq)))
511 * - require superuser power.
512 * - require strict serialization.
513 * - do not return a value
517 if (!capable(CAP_NET_ADMIN))
522 * - require local superuser power.
523 * - require strict serialization.
524 * - do not return a value
533 case SIOCSIFHWBROADCAST:
535 case SIOCBONDENSLAVE:
536 case SIOCBONDRELEASE:
537 case SIOCBONDSETHWADDR:
538 case SIOCBONDCHANGEACTIVE:
542 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
545 case SIOCBONDSLAVEINFOQUERY:
546 case SIOCBONDINFOQUERY:
547 dev_load(net, ifr.ifr_name);
549 ret = dev_ifsioc(net, &ifr, cmd);
554 /* Get the per device memory space. We can add this but
555 * currently do not support it */
557 /* Set the per device memory buffer space.
558 * Not applicable in our case */
563 * Unknown or private ioctl.
566 if (cmd == SIOCWANDEV ||
567 cmd == SIOCGHWTSTAMP ||
568 (cmd >= SIOCDEVPRIVATE &&
569 cmd <= SIOCDEVPRIVATE + 15)) {
570 dev_load(net, ifr.ifr_name);
572 ret = dev_ifsioc(net, &ifr, cmd);
574 if (!ret && copy_to_user(arg, &ifr,
575 sizeof(struct ifreq)))