1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kmod.h>
3 #include <linux/netdevice.h>
4 #include <linux/inetdevice.h>
5 #include <linux/etherdevice.h>
6 #include <linux/rtnetlink.h>
7 #include <linux/net_tstamp.h>
8 #include <linux/wireless.h>
9 #include <linux/if_bridge.h>
14 * Map an interface index to its name (SIOCGIFNAME)
18 * We need this ioctl for efficient implementation of the
19 * if_indextoname() function required by the IPv6 API. Without
20 * it, we would have to search all the interfaces to find a
24 static int dev_ifname(struct net
*net
, struct ifreq
*ifr
)
26 ifr
->ifr_name
[IFNAMSIZ
-1] = 0;
27 return netdev_get_name(net
, ifr
->ifr_name
, ifr
->ifr_ifindex
);
31 * Perform a SIOCGIFCONF call. This structure will change
32 * size eventually, and there is nothing I can do about it.
33 * Thus we will need a 'compatibility mode'.
35 int dev_ifconf(struct net
*net
, struct ifconf __user
*uifc
)
37 struct net_device
*dev
;
40 int len
, total
= 0, done
;
42 /* both the ifconf and the ifreq structures are slightly different */
43 if (in_compat_syscall()) {
44 struct compat_ifconf ifc32
;
46 if (copy_from_user(&ifc32
, uifc
, sizeof(struct compat_ifconf
)))
49 pos
= compat_ptr(ifc32
.ifcbuf
);
51 size
= sizeof(struct compat_ifreq
);
55 if (copy_from_user(&ifc
, uifc
, sizeof(struct ifconf
)))
60 size
= sizeof(struct ifreq
);
63 /* Loop over the interfaces, and write an info block for each. */
65 for_each_netdev(net
, dev
) {
67 done
= inet_gifconf(dev
, NULL
, 0, size
);
69 done
= inet_gifconf(dev
, pos
+ total
,
79 return put_user(total
, &uifc
->ifc_len
);
82 static int dev_getifmap(struct net_device
*dev
, struct ifreq
*ifr
)
84 struct ifmap
*ifmap
= &ifr
->ifr_map
;
86 if (in_compat_syscall()) {
87 struct compat_ifmap
*cifmap
= (struct compat_ifmap
*)ifmap
;
89 cifmap
->mem_start
= dev
->mem_start
;
90 cifmap
->mem_end
= dev
->mem_end
;
91 cifmap
->base_addr
= dev
->base_addr
;
92 cifmap
->irq
= dev
->irq
;
93 cifmap
->dma
= dev
->dma
;
94 cifmap
->port
= dev
->if_port
;
99 ifmap
->mem_start
= dev
->mem_start
;
100 ifmap
->mem_end
= dev
->mem_end
;
101 ifmap
->base_addr
= dev
->base_addr
;
102 ifmap
->irq
= dev
->irq
;
103 ifmap
->dma
= dev
->dma
;
104 ifmap
->port
= dev
->if_port
;
109 static int dev_setifmap(struct net_device
*dev
, struct ifreq
*ifr
)
111 struct compat_ifmap
*cifmap
= (struct compat_ifmap
*)&ifr
->ifr_map
;
113 if (!dev
->netdev_ops
->ndo_set_config
)
116 if (in_compat_syscall()) {
117 struct ifmap ifmap
= {
118 .mem_start
= cifmap
->mem_start
,
119 .mem_end
= cifmap
->mem_end
,
120 .base_addr
= cifmap
->base_addr
,
123 .port
= cifmap
->port
,
126 return dev
->netdev_ops
->ndo_set_config(dev
, &ifmap
);
129 return dev
->netdev_ops
->ndo_set_config(dev
, &ifr
->ifr_map
);
133 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
135 static int dev_ifsioc_locked(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
138 struct net_device
*dev
= dev_get_by_name_rcu(net
, ifr
->ifr_name
);
144 case SIOCGIFFLAGS
: /* Get interface flags */
145 ifr
->ifr_flags
= (short) dev_get_flags(dev
);
148 case SIOCGIFMETRIC
: /* Get the metric on the interface
149 (currently unused) */
153 case SIOCGIFMTU
: /* Get the MTU of a device */
154 ifr
->ifr_mtu
= dev
->mtu
;
162 return dev_getifmap(dev
, ifr
);
165 ifr
->ifr_ifindex
= dev
->ifindex
;
169 ifr
->ifr_qlen
= dev
->tx_queue_len
;
173 /* dev_ioctl() should ensure this case
184 static int net_hwtstamp_validate(struct ifreq
*ifr
)
186 struct hwtstamp_config cfg
;
187 enum hwtstamp_tx_types tx_type
;
188 enum hwtstamp_rx_filters rx_filter
;
189 int tx_type_valid
= 0;
190 int rx_filter_valid
= 0;
192 if (copy_from_user(&cfg
, ifr
->ifr_data
, sizeof(cfg
)))
195 if (cfg
.flags
) /* reserved for future extensions */
198 tx_type
= cfg
.tx_type
;
199 rx_filter
= cfg
.rx_filter
;
202 case HWTSTAMP_TX_OFF
:
204 case HWTSTAMP_TX_ONESTEP_SYNC
:
205 case HWTSTAMP_TX_ONESTEP_P2P
:
208 case __HWTSTAMP_TX_CNT
:
209 /* not a real value */
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
:
232 case __HWTSTAMP_FILTER_CNT
:
233 /* not a real value */
237 if (!tx_type_valid
|| !rx_filter_valid
)
243 static int dev_eth_ioctl(struct net_device
*dev
,
244 struct ifreq
*ifr
, unsigned int cmd
)
246 const struct net_device_ops
*ops
= dev
->netdev_ops
;
249 err
= dsa_ndo_eth_ioctl(dev
, ifr
, cmd
);
250 if (err
== 0 || err
!= -EOPNOTSUPP
)
253 if (ops
->ndo_eth_ioctl
) {
254 if (netif_device_present(dev
))
255 err
= ops
->ndo_eth_ioctl(dev
, ifr
, cmd
);
263 static int dev_siocbond(struct net_device
*dev
,
264 struct ifreq
*ifr
, unsigned int cmd
)
266 const struct net_device_ops
*ops
= dev
->netdev_ops
;
268 if (ops
->ndo_siocbond
) {
269 if (netif_device_present(dev
))
270 return ops
->ndo_siocbond(dev
, ifr
, cmd
);
278 static int dev_siocdevprivate(struct net_device
*dev
, struct ifreq
*ifr
,
279 void __user
*data
, unsigned int cmd
)
281 const struct net_device_ops
*ops
= dev
->netdev_ops
;
283 if (ops
->ndo_siocdevprivate
) {
284 if (netif_device_present(dev
))
285 return ops
->ndo_siocdevprivate(dev
, ifr
, data
, cmd
);
293 static int dev_siocwandev(struct net_device
*dev
, struct if_settings
*ifs
)
295 const struct net_device_ops
*ops
= dev
->netdev_ops
;
297 if (ops
->ndo_siocwandev
) {
298 if (netif_device_present(dev
))
299 return ops
->ndo_siocwandev(dev
, ifs
);
308 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
310 static int dev_ifsioc(struct net
*net
, struct ifreq
*ifr
, void __user
*data
,
314 struct net_device
*dev
= __dev_get_by_name(net
, ifr
->ifr_name
);
315 const struct net_device_ops
*ops
;
320 ops
= dev
->netdev_ops
;
323 case SIOCSIFFLAGS
: /* Set interface flags */
324 return dev_change_flags(dev
, ifr
->ifr_flags
, NULL
);
326 case SIOCSIFMETRIC
: /* Set the metric on the interface
327 (currently unused) */
330 case SIOCSIFMTU
: /* Set the MTU of a device */
331 return dev_set_mtu(dev
, ifr
->ifr_mtu
);
334 if (dev
->addr_len
> sizeof(struct sockaddr
))
336 return dev_set_mac_address_user(dev
, &ifr
->ifr_hwaddr
, NULL
);
338 case SIOCSIFHWBROADCAST
:
339 if (ifr
->ifr_hwaddr
.sa_family
!= dev
->type
)
341 memcpy(dev
->broadcast
, ifr
->ifr_hwaddr
.sa_data
,
342 min(sizeof(ifr
->ifr_hwaddr
.sa_data
),
343 (size_t)dev
->addr_len
));
344 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
348 return dev_setifmap(dev
, ifr
);
351 if (!ops
->ndo_set_rx_mode
||
352 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
354 if (!netif_device_present(dev
))
356 return dev_mc_add_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
359 if (!ops
->ndo_set_rx_mode
||
360 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
362 if (!netif_device_present(dev
))
364 return dev_mc_del_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
367 if (ifr
->ifr_qlen
< 0)
369 return dev_change_tx_queue_len(dev
, ifr
->ifr_qlen
);
372 ifr
->ifr_newname
[IFNAMSIZ
-1] = '\0';
373 return dev_change_name(dev
, ifr
->ifr_newname
);
376 return dev_siocwandev(dev
, &ifr
->ifr_settings
);
380 if (!netif_device_present(dev
))
382 if (!netif_is_bridge_master(dev
))
386 err
= br_ioctl_call(net
, netdev_priv(dev
), cmd
, ifr
, NULL
);
392 err
= net_hwtstamp_validate(ifr
);
398 * Unknown or private ioctl
401 if (cmd
>= SIOCDEVPRIVATE
&&
402 cmd
<= SIOCDEVPRIVATE
+ 15)
403 return dev_siocdevprivate(dev
, ifr
, data
, cmd
);
405 if (cmd
== SIOCGMIIPHY
||
406 cmd
== SIOCGMIIREG
||
407 cmd
== SIOCSMIIREG
||
408 cmd
== SIOCSHWTSTAMP
||
409 cmd
== SIOCGHWTSTAMP
) {
410 err
= dev_eth_ioctl(dev
, ifr
, cmd
);
411 } else if (cmd
== SIOCBONDENSLAVE
||
412 cmd
== SIOCBONDRELEASE
||
413 cmd
== SIOCBONDSETHWADDR
||
414 cmd
== SIOCBONDSLAVEINFOQUERY
||
415 cmd
== SIOCBONDINFOQUERY
||
416 cmd
== SIOCBONDCHANGEACTIVE
) {
417 err
= dev_siocbond(dev
, ifr
, cmd
);
426 * dev_load - load a network module
427 * @net: the applicable net namespace
428 * @name: name of interface
430 * If a network interface is not present and the process has suitable
431 * privileges this function loads the module. If module loading is not
432 * available in this kernel then it becomes a nop.
435 void dev_load(struct net
*net
, const char *name
)
437 struct net_device
*dev
;
441 dev
= dev_get_by_name_rcu(net
, name
);
445 if (no_module
&& capable(CAP_NET_ADMIN
))
446 no_module
= request_module("netdev-%s", name
);
447 if (no_module
&& capable(CAP_SYS_MODULE
))
448 request_module("%s", name
);
450 EXPORT_SYMBOL(dev_load
);
453 * This function handles all "interface"-type I/O control requests. The actual
454 * 'doing' part of this is dev_ifsioc above.
458 * dev_ioctl - network device ioctl
459 * @net: the applicable net namespace
460 * @cmd: command to issue
461 * @ifr: pointer to a struct ifreq in user space
462 * @need_copyout: whether or not copy_to_user() should be called
464 * Issue ioctl functions to devices. This is normally called by the
465 * user space syscall interfaces but can sometimes be useful for
466 * other purposes. The return value is the return from the syscall if
467 * positive or a negative errno code on error.
470 int dev_ioctl(struct net
*net
, unsigned int cmd
, struct ifreq
*ifr
,
471 void __user
*data
, bool *need_copyout
)
477 *need_copyout
= true;
478 if (cmd
== SIOCGIFNAME
)
479 return dev_ifname(net
, ifr
);
481 ifr
->ifr_name
[IFNAMSIZ
-1] = 0;
483 colon
= strchr(ifr
->ifr_name
, ':');
488 * See which interface the caller is talking about.
493 dev_load(net
, ifr
->ifr_name
);
494 ret
= dev_get_mac_address(&ifr
->ifr_hwaddr
, net
, ifr
->ifr_name
);
500 * - can be done by all.
501 * - atomic and do not require locking.
511 dev_load(net
, ifr
->ifr_name
);
513 ret
= dev_ifsioc_locked(net
, ifr
, cmd
);
520 dev_load(net
, ifr
->ifr_name
);
522 ret
= dev_ethtool(net
, ifr
, data
);
530 * - require superuser power.
531 * - require strict serialization.
537 dev_load(net
, ifr
->ifr_name
);
538 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
541 ret
= dev_ifsioc(net
, ifr
, data
, cmd
);
549 * - require superuser power.
550 * - require strict serialization.
551 * - do not return a value
555 if (!capable(CAP_NET_ADMIN
))
560 * - require local superuser power.
561 * - require strict serialization.
562 * - do not return a value
571 case SIOCSIFHWBROADCAST
:
573 case SIOCBONDENSLAVE
:
574 case SIOCBONDRELEASE
:
575 case SIOCBONDSETHWADDR
:
576 case SIOCBONDCHANGEACTIVE
:
580 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
583 case SIOCBONDSLAVEINFOQUERY
:
584 case SIOCBONDINFOQUERY
:
585 dev_load(net
, ifr
->ifr_name
);
587 ret
= dev_ifsioc(net
, ifr
, data
, cmd
);
590 *need_copyout
= false;
594 /* Get the per device memory space. We can add this but
595 * currently do not support it */
597 /* Set the per device memory buffer space.
598 * Not applicable in our case */
603 * Unknown or private ioctl.
606 if (cmd
== SIOCWANDEV
||
607 cmd
== SIOCGHWTSTAMP
||
608 (cmd
>= SIOCDEVPRIVATE
&&
609 cmd
<= SIOCDEVPRIVATE
+ 15)) {
610 dev_load(net
, ifr
->ifr_name
);
612 ret
= dev_ifsioc(net
, ifr
, data
, cmd
);