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
)
22 struct net_device
*dev
;
27 * Fetch the caller's info block.
30 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
34 seq
= read_seqcount_begin(&devnet_rename_seq
);
36 dev
= dev_get_by_index_rcu(net
, ifr
.ifr_ifindex
);
42 strcpy(ifr
.ifr_name
, dev
->name
);
44 if (read_seqcount_retry(&devnet_rename_seq
, seq
))
47 if (copy_to_user(arg
, &ifr
, sizeof(struct ifreq
)))
52 static gifconf_func_t
*gifconf_list
[NPROTO
];
55 * register_gifconf - register a SIOCGIF handler
56 * @family: Address family
57 * @gifconf: Function handler
59 * Register protocol dependent address dumping routines. The handler
60 * that is passed must not be freed or reused until it has been replaced
63 int register_gifconf(unsigned int family
, gifconf_func_t
*gifconf
)
67 gifconf_list
[family
] = gifconf
;
70 EXPORT_SYMBOL(register_gifconf
);
73 * Perform a SIOCGIFCONF call. This structure will change
74 * size eventually, and there is nothing I can do about it.
75 * Thus we will need a 'compatibility mode'.
78 static int dev_ifconf(struct net
*net
, char __user
*arg
)
81 struct net_device
*dev
;
88 * Fetch the caller's info block.
91 if (copy_from_user(&ifc
, arg
, sizeof(struct ifconf
)))
98 * Loop over the interfaces, and write an info block for each.
102 for_each_netdev(net
, dev
) {
103 for (i
= 0; i
< NPROTO
; i
++) {
104 if (gifconf_list
[i
]) {
107 done
= gifconf_list
[i
](dev
, NULL
, 0);
109 done
= gifconf_list
[i
](dev
, pos
+ total
,
119 * All done. Write the updated control block back to the caller.
124 * Both BSD and Solaris return 0 here, so we do too.
126 return copy_to_user(arg
, &ifc
, sizeof(struct ifconf
)) ? -EFAULT
: 0;
130 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
132 static int dev_ifsioc_locked(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
135 struct net_device
*dev
= dev_get_by_name_rcu(net
, ifr
->ifr_name
);
141 case SIOCGIFFLAGS
: /* Get interface flags */
142 ifr
->ifr_flags
= (short) dev_get_flags(dev
);
145 case SIOCGIFMETRIC
: /* Get the metric on the interface
146 (currently unused) */
150 case SIOCGIFMTU
: /* Get the MTU of a device */
151 ifr
->ifr_mtu
= dev
->mtu
;
156 memset(ifr
->ifr_hwaddr
.sa_data
, 0, sizeof ifr
->ifr_hwaddr
.sa_data
);
158 memcpy(ifr
->ifr_hwaddr
.sa_data
, dev
->dev_addr
,
159 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
160 ifr
->ifr_hwaddr
.sa_family
= dev
->type
;
168 ifr
->ifr_map
.mem_start
= dev
->mem_start
;
169 ifr
->ifr_map
.mem_end
= dev
->mem_end
;
170 ifr
->ifr_map
.base_addr
= dev
->base_addr
;
171 ifr
->ifr_map
.irq
= dev
->irq
;
172 ifr
->ifr_map
.dma
= dev
->dma
;
173 ifr
->ifr_map
.port
= dev
->if_port
;
177 ifr
->ifr_ifindex
= dev
->ifindex
;
181 ifr
->ifr_qlen
= dev
->tx_queue_len
;
185 /* dev_ioctl() should ensure this case
196 static int net_hwtstamp_validate(struct ifreq
*ifr
)
198 struct hwtstamp_config cfg
;
199 enum hwtstamp_tx_types tx_type
;
200 enum hwtstamp_rx_filters rx_filter
;
201 int tx_type_valid
= 0;
202 int rx_filter_valid
= 0;
204 if (copy_from_user(&cfg
, ifr
->ifr_data
, sizeof(cfg
)))
207 if (cfg
.flags
) /* reserved for future extensions */
210 tx_type
= cfg
.tx_type
;
211 rx_filter
= cfg
.rx_filter
;
214 case HWTSTAMP_TX_OFF
:
216 case HWTSTAMP_TX_ONESTEP_SYNC
:
222 case HWTSTAMP_FILTER_NONE
:
223 case HWTSTAMP_FILTER_ALL
:
224 case HWTSTAMP_FILTER_SOME
:
225 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT
:
226 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC
:
227 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ
:
228 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT
:
229 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC
:
230 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ
:
231 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT
:
232 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC
:
233 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ
:
234 case HWTSTAMP_FILTER_PTP_V2_EVENT
:
235 case HWTSTAMP_FILTER_PTP_V2_SYNC
:
236 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ
:
241 if (!tx_type_valid
|| !rx_filter_valid
)
248 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
250 static int dev_ifsioc(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
253 struct net_device
*dev
= __dev_get_by_name(net
, ifr
->ifr_name
);
254 const struct net_device_ops
*ops
;
259 ops
= dev
->netdev_ops
;
262 case SIOCSIFFLAGS
: /* Set interface flags */
263 return dev_change_flags(dev
, ifr
->ifr_flags
);
265 case SIOCSIFMETRIC
: /* Set the metric on the interface
266 (currently unused) */
269 case SIOCSIFMTU
: /* Set the MTU of a device */
270 return dev_set_mtu(dev
, ifr
->ifr_mtu
);
273 return dev_set_mac_address(dev
, &ifr
->ifr_hwaddr
);
275 case SIOCSIFHWBROADCAST
:
276 if (ifr
->ifr_hwaddr
.sa_family
!= dev
->type
)
278 memcpy(dev
->broadcast
, ifr
->ifr_hwaddr
.sa_data
,
279 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
280 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
284 if (ops
->ndo_set_config
) {
285 if (!netif_device_present(dev
))
287 return ops
->ndo_set_config(dev
, &ifr
->ifr_map
);
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_add_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
300 if (!ops
->ndo_set_rx_mode
||
301 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
303 if (!netif_device_present(dev
))
305 return dev_mc_del_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
308 if (ifr
->ifr_qlen
< 0)
310 dev
->tx_queue_len
= ifr
->ifr_qlen
;
314 ifr
->ifr_newname
[IFNAMSIZ
-1] = '\0';
315 return dev_change_name(dev
, ifr
->ifr_newname
);
318 err
= net_hwtstamp_validate(ifr
);
324 * Unknown or private ioctl
327 if ((cmd
>= SIOCDEVPRIVATE
&&
328 cmd
<= SIOCDEVPRIVATE
+ 15) ||
329 cmd
== SIOCBONDENSLAVE
||
330 cmd
== SIOCBONDRELEASE
||
331 cmd
== SIOCBONDSETHWADDR
||
332 cmd
== SIOCBONDSLAVEINFOQUERY
||
333 cmd
== SIOCBONDINFOQUERY
||
334 cmd
== SIOCBONDCHANGEACTIVE
||
335 cmd
== SIOCGMIIPHY
||
336 cmd
== SIOCGMIIREG
||
337 cmd
== SIOCSMIIREG
||
338 cmd
== SIOCBRADDIF
||
339 cmd
== SIOCBRDELIF
||
340 cmd
== SIOCSHWTSTAMP
||
343 if (ops
->ndo_do_ioctl
) {
344 if (netif_device_present(dev
))
345 err
= ops
->ndo_do_ioctl(dev
, ifr
, cmd
);
357 * dev_load - load a network module
358 * @net: the applicable net namespace
359 * @name: name of interface
361 * If a network interface is not present and the process has suitable
362 * privileges this function loads the module. If module loading is not
363 * available in this kernel then it becomes a nop.
366 void dev_load(struct net
*net
, const char *name
)
368 struct net_device
*dev
;
372 dev
= dev_get_by_name_rcu(net
, name
);
376 if (no_module
&& capable(CAP_NET_ADMIN
))
377 no_module
= request_module("netdev-%s", name
);
378 if (no_module
&& capable(CAP_SYS_MODULE
)) {
379 if (!request_module("%s", name
))
380 pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
384 EXPORT_SYMBOL(dev_load
);
387 * This function handles all "interface"-type I/O control requests. The actual
388 * 'doing' part of this is dev_ifsioc above.
392 * dev_ioctl - network device ioctl
393 * @net: the applicable net namespace
394 * @cmd: command to issue
395 * @arg: pointer to a struct ifreq in user space
397 * Issue ioctl functions to devices. This is normally called by the
398 * user space syscall interfaces but can sometimes be useful for
399 * other purposes. The return value is the return from the syscall if
400 * positive or a negative errno code on error.
403 int dev_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
409 /* One special case: SIOCGIFCONF takes ifconf argument
410 and requires shared lock, because it sleeps writing
414 if (cmd
== SIOCGIFCONF
) {
416 ret
= dev_ifconf(net
, (char __user
*) arg
);
420 if (cmd
== SIOCGIFNAME
)
421 return dev_ifname(net
, (struct ifreq __user
*)arg
);
423 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
426 ifr
.ifr_name
[IFNAMSIZ
-1] = 0;
428 colon
= strchr(ifr
.ifr_name
, ':');
433 * See which interface the caller is talking about.
439 * - can be done by all.
440 * - atomic and do not require locking.
451 dev_load(net
, ifr
.ifr_name
);
453 ret
= dev_ifsioc_locked(net
, &ifr
, cmd
);
458 if (copy_to_user(arg
, &ifr
,
459 sizeof(struct ifreq
)))
465 dev_load(net
, ifr
.ifr_name
);
467 ret
= dev_ethtool(net
, &ifr
);
472 if (copy_to_user(arg
, &ifr
,
473 sizeof(struct ifreq
)))
480 * - require superuser power.
481 * - require strict serialization.
487 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
489 dev_load(net
, ifr
.ifr_name
);
491 ret
= dev_ifsioc(net
, &ifr
, cmd
);
496 if (copy_to_user(arg
, &ifr
,
497 sizeof(struct ifreq
)))
504 * - require superuser power.
505 * - require strict serialization.
506 * - do not return a value
510 if (!capable(CAP_NET_ADMIN
))
515 * - require local superuser power.
516 * - require strict serialization.
517 * - do not return a value
526 case SIOCSIFHWBROADCAST
:
528 case SIOCBONDENSLAVE
:
529 case SIOCBONDRELEASE
:
530 case SIOCBONDSETHWADDR
:
531 case SIOCBONDCHANGEACTIVE
:
535 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
538 case SIOCBONDSLAVEINFOQUERY
:
539 case SIOCBONDINFOQUERY
:
540 dev_load(net
, ifr
.ifr_name
);
542 ret
= dev_ifsioc(net
, &ifr
, cmd
);
547 /* Get the per device memory space. We can add this but
548 * currently do not support it */
550 /* Set the per device memory buffer space.
551 * Not applicable in our case */
556 * Unknown or private ioctl.
559 if (cmd
== SIOCWANDEV
||
560 (cmd
>= SIOCDEVPRIVATE
&&
561 cmd
<= SIOCDEVPRIVATE
+ 15)) {
562 dev_load(net
, ifr
.ifr_name
);
564 ret
= dev_ifsioc(net
, &ifr
, cmd
);
566 if (!ret
&& copy_to_user(arg
, &ifr
,
567 sizeof(struct ifreq
)))
571 /* Take care of Wireless Extensions */
572 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
)
573 return wext_handle_ioctl(net
, &ifr
, cmd
, arg
);