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:
229 case HWTSTAMP_FILTER_NTP_ALL:
234 if (!tx_type_valid || !rx_filter_valid)
241 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
243 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
246 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
247 const struct net_device_ops *ops;
252 ops = dev->netdev_ops;
255 case SIOCSIFFLAGS: /* Set interface flags */
256 return dev_change_flags(dev, ifr->ifr_flags);
258 case SIOCSIFMETRIC: /* Set the metric on the interface
259 (currently unused) */
262 case SIOCSIFMTU: /* Set the MTU of a device */
263 return dev_set_mtu(dev, ifr->ifr_mtu);
266 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
268 case SIOCSIFHWBROADCAST:
269 if (ifr->ifr_hwaddr.sa_family != dev->type)
271 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
272 min(sizeof(ifr->ifr_hwaddr.sa_data),
273 (size_t)dev->addr_len));
274 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
278 if (ops->ndo_set_config) {
279 if (!netif_device_present(dev))
281 return ops->ndo_set_config(dev, &ifr->ifr_map);
286 if (!ops->ndo_set_rx_mode ||
287 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
289 if (!netif_device_present(dev))
291 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
294 if (!ops->ndo_set_rx_mode ||
295 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
297 if (!netif_device_present(dev))
299 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
302 if (ifr->ifr_qlen < 0)
304 dev->tx_queue_len = ifr->ifr_qlen;
308 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
309 return dev_change_name(dev, ifr->ifr_newname);
312 err = net_hwtstamp_validate(ifr);
318 * Unknown or private ioctl
321 if ((cmd >= SIOCDEVPRIVATE &&
322 cmd <= SIOCDEVPRIVATE + 15) ||
323 cmd == SIOCBONDENSLAVE ||
324 cmd == SIOCBONDRELEASE ||
325 cmd == SIOCBONDSETHWADDR ||
326 cmd == SIOCBONDSLAVEINFOQUERY ||
327 cmd == SIOCBONDINFOQUERY ||
328 cmd == SIOCBONDCHANGEACTIVE ||
329 cmd == SIOCGMIIPHY ||
330 cmd == SIOCGMIIREG ||
331 cmd == SIOCSMIIREG ||
332 cmd == SIOCBRADDIF ||
333 cmd == SIOCBRDELIF ||
334 cmd == SIOCSHWTSTAMP ||
335 cmd == SIOCGHWTSTAMP ||
338 if (ops->ndo_do_ioctl) {
339 if (netif_device_present(dev))
340 err = ops->ndo_do_ioctl(dev, ifr, cmd);
352 * dev_load - load a network module
353 * @net: the applicable net namespace
354 * @name: name of interface
356 * If a network interface is not present and the process has suitable
357 * privileges this function loads the module. If module loading is not
358 * available in this kernel then it becomes a nop.
361 void dev_load(struct net *net, const char *name)
363 struct net_device *dev;
367 dev = dev_get_by_name_rcu(net, name);
371 if (no_module && capable(CAP_NET_ADMIN))
372 no_module = request_module("netdev-%s", name);
373 if (no_module && capable(CAP_SYS_MODULE))
374 request_module("%s", name);
376 EXPORT_SYMBOL(dev_load);
379 * This function handles all "interface"-type I/O control requests. The actual
380 * 'doing' part of this is dev_ifsioc above.
384 * dev_ioctl - network device ioctl
385 * @net: the applicable net namespace
386 * @cmd: command to issue
387 * @arg: pointer to a struct ifreq in user space
389 * Issue ioctl functions to devices. This is normally called by the
390 * user space syscall interfaces but can sometimes be useful for
391 * other purposes. The return value is the return from the syscall if
392 * positive or a negative errno code on error.
395 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
401 /* One special case: SIOCGIFCONF takes ifconf argument
402 and requires shared lock, because it sleeps writing
406 if (cmd == SIOCGIFCONF) {
408 ret = dev_ifconf(net, (char __user *) arg);
412 if (cmd == SIOCGIFNAME)
413 return dev_ifname(net, (struct ifreq __user *)arg);
416 * Take care of Wireless Extensions. Unfortunately struct iwreq
417 * isn't a proper subset of struct ifreq (it's 8 byte shorter)
418 * so we need to treat it specially, otherwise applications may
419 * fault if the struct they're passing happens to land at the
420 * end of a mapped page.
422 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
425 if (copy_from_user(&iwr, arg, sizeof(iwr)))
428 iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
430 return wext_handle_ioctl(net, &iwr, cmd, arg);
433 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
436 ifr.ifr_name[IFNAMSIZ-1] = 0;
438 colon = strchr(ifr.ifr_name, ':');
443 * See which interface the caller is talking about.
449 * - can be done by all.
450 * - atomic and do not require locking.
461 dev_load(net, ifr.ifr_name);
463 ret = dev_ifsioc_locked(net, &ifr, cmd);
468 if (copy_to_user(arg, &ifr,
469 sizeof(struct ifreq)))
475 dev_load(net, ifr.ifr_name);
477 ret = dev_ethtool(net, &ifr);
482 if (copy_to_user(arg, &ifr,
483 sizeof(struct ifreq)))
490 * - require superuser power.
491 * - require strict serialization.
497 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
499 dev_load(net, ifr.ifr_name);
501 ret = dev_ifsioc(net, &ifr, cmd);
506 if (copy_to_user(arg, &ifr,
507 sizeof(struct ifreq)))
514 * - require superuser power.
515 * - require strict serialization.
516 * - do not return a value
520 if (!capable(CAP_NET_ADMIN))
525 * - require local superuser power.
526 * - require strict serialization.
527 * - do not return a value
536 case SIOCSIFHWBROADCAST:
538 case SIOCBONDENSLAVE:
539 case SIOCBONDRELEASE:
540 case SIOCBONDSETHWADDR:
541 case SIOCBONDCHANGEACTIVE:
545 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
548 case SIOCBONDSLAVEINFOQUERY:
549 case SIOCBONDINFOQUERY:
550 dev_load(net, ifr.ifr_name);
552 ret = dev_ifsioc(net, &ifr, cmd);
557 /* Get the per device memory space. We can add this but
558 * currently do not support it */
560 /* Set the per device memory buffer space.
561 * Not applicable in our case */
566 * Unknown or private ioctl.
569 if (cmd == SIOCWANDEV ||
570 cmd == SIOCGHWTSTAMP ||
571 (cmd >= SIOCDEVPRIVATE &&
572 cmd <= SIOCDEVPRIVATE + 15)) {
573 dev_load(net, ifr.ifr_name);
575 ret = dev_ifsioc(net, &ifr, cmd);
577 if (!ret && copy_to_user(arg, &ifr,
578 sizeof(struct ifreq)))