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)))
31 ifr.ifr_name[IFNAMSIZ-1] = 0;
33 error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
37 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
42 static gifconf_func_t *gifconf_list[NPROTO];
45 * register_gifconf - register a SIOCGIF handler
46 * @family: Address family
47 * @gifconf: Function handler
49 * Register protocol dependent address dumping routines. The handler
50 * that is passed must not be freed or reused until it has been replaced
53 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
57 gifconf_list[family] = gifconf;
60 EXPORT_SYMBOL(register_gifconf);
63 * Perform a SIOCGIFCONF call. This structure will change
64 * size eventually, and there is nothing I can do about it.
65 * Thus we will need a 'compatibility mode'.
68 static int dev_ifconf(struct net *net, char __user *arg)
71 struct net_device *dev;
78 * Fetch the caller's info block.
81 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
88 * Loop over the interfaces, and write an info block for each.
92 for_each_netdev(net, dev) {
93 for (i = 0; i < NPROTO; i++) {
94 if (gifconf_list[i]) {
97 done = gifconf_list[i](dev, NULL, 0);
99 done = gifconf_list[i](dev, pos + total,
109 * All done. Write the updated control block back to the caller.
114 * Both BSD and Solaris return 0 here, so we do too.
116 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
120 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
122 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
125 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
131 case SIOCGIFFLAGS: /* Get interface flags */
132 ifr->ifr_flags = (short) dev_get_flags(dev);
135 case SIOCGIFMETRIC: /* Get the metric on the interface
136 (currently unused) */
140 case SIOCGIFMTU: /* Get the MTU of a device */
141 ifr->ifr_mtu = dev->mtu;
146 memset(ifr->ifr_hwaddr.sa_data, 0,
147 sizeof(ifr->ifr_hwaddr.sa_data));
149 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
150 min(sizeof(ifr->ifr_hwaddr.sa_data),
151 (size_t)dev->addr_len));
152 ifr->ifr_hwaddr.sa_family = dev->type;
160 ifr->ifr_map.mem_start = dev->mem_start;
161 ifr->ifr_map.mem_end = dev->mem_end;
162 ifr->ifr_map.base_addr = dev->base_addr;
163 ifr->ifr_map.irq = dev->irq;
164 ifr->ifr_map.dma = dev->dma;
165 ifr->ifr_map.port = dev->if_port;
169 ifr->ifr_ifindex = dev->ifindex;
173 ifr->ifr_qlen = dev->tx_queue_len;
177 /* dev_ioctl() should ensure this case
188 static int net_hwtstamp_validate(struct ifreq *ifr)
190 struct hwtstamp_config cfg;
191 enum hwtstamp_tx_types tx_type;
192 enum hwtstamp_rx_filters rx_filter;
193 int tx_type_valid = 0;
194 int rx_filter_valid = 0;
196 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
199 if (cfg.flags) /* reserved for future extensions */
202 tx_type = cfg.tx_type;
203 rx_filter = cfg.rx_filter;
206 case HWTSTAMP_TX_OFF:
208 case HWTSTAMP_TX_ONESTEP_SYNC:
214 case HWTSTAMP_FILTER_NONE:
215 case HWTSTAMP_FILTER_ALL:
216 case HWTSTAMP_FILTER_SOME:
217 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
218 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
219 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
220 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
221 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
222 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
223 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
224 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
225 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
226 case HWTSTAMP_FILTER_PTP_V2_EVENT:
227 case HWTSTAMP_FILTER_PTP_V2_SYNC:
228 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
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);
414 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
417 ifr.ifr_name[IFNAMSIZ-1] = 0;
419 colon = strchr(ifr.ifr_name, ':');
424 * See which interface the caller is talking about.
430 * - can be done by all.
431 * - atomic and do not require locking.
442 dev_load(net, ifr.ifr_name);
444 ret = dev_ifsioc_locked(net, &ifr, cmd);
449 if (copy_to_user(arg, &ifr,
450 sizeof(struct ifreq)))
456 dev_load(net, ifr.ifr_name);
458 ret = dev_ethtool(net, &ifr);
463 if (copy_to_user(arg, &ifr,
464 sizeof(struct ifreq)))
471 * - require superuser power.
472 * - require strict serialization.
478 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
480 dev_load(net, ifr.ifr_name);
482 ret = dev_ifsioc(net, &ifr, cmd);
487 if (copy_to_user(arg, &ifr,
488 sizeof(struct ifreq)))
495 * - require superuser power.
496 * - require strict serialization.
497 * - do not return a value
501 if (!capable(CAP_NET_ADMIN))
506 * - require local superuser power.
507 * - require strict serialization.
508 * - do not return a value
517 case SIOCSIFHWBROADCAST:
519 case SIOCBONDENSLAVE:
520 case SIOCBONDRELEASE:
521 case SIOCBONDSETHWADDR:
522 case SIOCBONDCHANGEACTIVE:
526 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
529 case SIOCBONDSLAVEINFOQUERY:
530 case SIOCBONDINFOQUERY:
531 dev_load(net, ifr.ifr_name);
533 ret = dev_ifsioc(net, &ifr, cmd);
538 /* Get the per device memory space. We can add this but
539 * currently do not support it */
541 /* Set the per device memory buffer space.
542 * Not applicable in our case */
547 * Unknown or private ioctl.
550 if (cmd == SIOCWANDEV ||
551 cmd == SIOCGHWTSTAMP ||
552 (cmd >= SIOCDEVPRIVATE &&
553 cmd <= SIOCDEVPRIVATE + 15)) {
554 dev_load(net, ifr.ifr_name);
556 ret = dev_ifsioc(net, &ifr, cmd);
558 if (!ret && copy_to_user(arg, &ifr,
559 sizeof(struct ifreq)))
563 /* Take care of Wireless Extensions */
564 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
565 return wext_handle_ioctl(net, &ifr, cmd, arg);