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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net-sysfs.c - network device class and attributes
4 *
5 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
6 */
7
8#include <linux/capability.h>
9#include <linux/kernel.h>
10#include <linux/netdevice.h>
11#include <linux/if_arp.h>
12#include <linux/slab.h>
13#include <linux/sched/signal.h>
14#include <linux/sched/isolation.h>
15#include <linux/nsproxy.h>
16#include <net/sock.h>
17#include <net/net_namespace.h>
18#include <linux/rtnetlink.h>
19#include <linux/vmalloc.h>
20#include <linux/export.h>
21#include <linux/jiffies.h>
22#include <linux/pm_runtime.h>
23#include <linux/of.h>
24#include <linux/of_net.h>
25#include <linux/cpu.h>
26
27#include "dev.h"
28#include "net-sysfs.h"
29
30#ifdef CONFIG_SYSFS
31static const char fmt_hex[] = "%#x\n";
32static const char fmt_dec[] = "%d\n";
33static const char fmt_ulong[] = "%lu\n";
34static const char fmt_u64[] = "%llu\n";
35
36/* Caller holds RTNL or dev_base_lock */
37static inline int dev_isalive(const struct net_device *dev)
38{
39 return dev->reg_state <= NETREG_REGISTERED;
40}
41
42/* use same locking rules as GIF* ioctl's */
43static ssize_t netdev_show(const struct device *dev,
44 struct device_attribute *attr, char *buf,
45 ssize_t (*format)(const struct net_device *, char *))
46{
47 struct net_device *ndev = to_net_dev(dev);
48 ssize_t ret = -EINVAL;
49
50 read_lock(&dev_base_lock);
51 if (dev_isalive(ndev))
52 ret = (*format)(ndev, buf);
53 read_unlock(&dev_base_lock);
54
55 return ret;
56}
57
58/* generate a show function for simple field */
59#define NETDEVICE_SHOW(field, format_string) \
60static ssize_t format_##field(const struct net_device *dev, char *buf) \
61{ \
62 return sysfs_emit(buf, format_string, dev->field); \
63} \
64static ssize_t field##_show(struct device *dev, \
65 struct device_attribute *attr, char *buf) \
66{ \
67 return netdev_show(dev, attr, buf, format_##field); \
68} \
69
70#define NETDEVICE_SHOW_RO(field, format_string) \
71NETDEVICE_SHOW(field, format_string); \
72static DEVICE_ATTR_RO(field)
73
74#define NETDEVICE_SHOW_RW(field, format_string) \
75NETDEVICE_SHOW(field, format_string); \
76static DEVICE_ATTR_RW(field)
77
78/* use same locking and permission rules as SIF* ioctl's */
79static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
80 const char *buf, size_t len,
81 int (*set)(struct net_device *, unsigned long))
82{
83 struct net_device *netdev = to_net_dev(dev);
84 struct net *net = dev_net(netdev);
85 unsigned long new;
86 int ret;
87
88 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
89 return -EPERM;
90
91 ret = kstrtoul(buf, 0, &new);
92 if (ret)
93 goto err;
94
95 if (!rtnl_trylock())
96 return restart_syscall();
97
98 if (dev_isalive(netdev)) {
99 ret = (*set)(netdev, new);
100 if (ret == 0)
101 ret = len;
102 }
103 rtnl_unlock();
104 err:
105 return ret;
106}
107
108NETDEVICE_SHOW_RO(dev_id, fmt_hex);
109NETDEVICE_SHOW_RO(dev_port, fmt_dec);
110NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
111NETDEVICE_SHOW_RO(addr_len, fmt_dec);
112NETDEVICE_SHOW_RO(ifindex, fmt_dec);
113NETDEVICE_SHOW_RO(type, fmt_dec);
114NETDEVICE_SHOW_RO(link_mode, fmt_dec);
115
116static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
117 char *buf)
118{
119 struct net_device *ndev = to_net_dev(dev);
120
121 return sysfs_emit(buf, fmt_dec, dev_get_iflink(ndev));
122}
123static DEVICE_ATTR_RO(iflink);
124
125static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
126{
127 return sysfs_emit(buf, fmt_dec, dev->name_assign_type);
128}
129
130static ssize_t name_assign_type_show(struct device *dev,
131 struct device_attribute *attr,
132 char *buf)
133{
134 struct net_device *ndev = to_net_dev(dev);
135 ssize_t ret = -EINVAL;
136
137 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
138 ret = netdev_show(dev, attr, buf, format_name_assign_type);
139
140 return ret;
141}
142static DEVICE_ATTR_RO(name_assign_type);
143
144/* use same locking rules as GIFHWADDR ioctl's */
145static ssize_t address_show(struct device *dev, struct device_attribute *attr,
146 char *buf)
147{
148 struct net_device *ndev = to_net_dev(dev);
149 ssize_t ret = -EINVAL;
150
151 read_lock(&dev_base_lock);
152 if (dev_isalive(ndev))
153 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
154 read_unlock(&dev_base_lock);
155 return ret;
156}
157static DEVICE_ATTR_RO(address);
158
159static ssize_t broadcast_show(struct device *dev,
160 struct device_attribute *attr, char *buf)
161{
162 struct net_device *ndev = to_net_dev(dev);
163
164 if (dev_isalive(ndev))
165 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
166 return -EINVAL;
167}
168static DEVICE_ATTR_RO(broadcast);
169
170static int change_carrier(struct net_device *dev, unsigned long new_carrier)
171{
172 if (!netif_running(dev))
173 return -EINVAL;
174 return dev_change_carrier(dev, (bool)new_carrier);
175}
176
177static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
178 const char *buf, size_t len)
179{
180 struct net_device *netdev = to_net_dev(dev);
181
182 /* The check is also done in change_carrier; this helps returning early
183 * without hitting the trylock/restart in netdev_store.
184 */
185 if (!netdev->netdev_ops->ndo_change_carrier)
186 return -EOPNOTSUPP;
187
188 return netdev_store(dev, attr, buf, len, change_carrier);
189}
190
191static ssize_t carrier_show(struct device *dev,
192 struct device_attribute *attr, char *buf)
193{
194 struct net_device *netdev = to_net_dev(dev);
195
196 if (netif_running(netdev))
197 return sysfs_emit(buf, fmt_dec, !!netif_carrier_ok(netdev));
198
199 return -EINVAL;
200}
201static DEVICE_ATTR_RW(carrier);
202
203static ssize_t speed_show(struct device *dev,
204 struct device_attribute *attr, char *buf)
205{
206 struct net_device *netdev = to_net_dev(dev);
207 int ret = -EINVAL;
208
209 /* The check is also done in __ethtool_get_link_ksettings; this helps
210 * returning early without hitting the trylock/restart below.
211 */
212 if (!netdev->ethtool_ops->get_link_ksettings)
213 return ret;
214
215 if (!rtnl_trylock())
216 return restart_syscall();
217
218 if (netif_running(netdev) && netif_device_present(netdev)) {
219 struct ethtool_link_ksettings cmd;
220
221 if (!__ethtool_get_link_ksettings(netdev, &cmd))
222 ret = sysfs_emit(buf, fmt_dec, cmd.base.speed);
223 }
224 rtnl_unlock();
225 return ret;
226}
227static DEVICE_ATTR_RO(speed);
228
229static ssize_t duplex_show(struct device *dev,
230 struct device_attribute *attr, char *buf)
231{
232 struct net_device *netdev = to_net_dev(dev);
233 int ret = -EINVAL;
234
235 /* The check is also done in __ethtool_get_link_ksettings; this helps
236 * returning early without hitting the trylock/restart below.
237 */
238 if (!netdev->ethtool_ops->get_link_ksettings)
239 return ret;
240
241 if (!rtnl_trylock())
242 return restart_syscall();
243
244 if (netif_running(netdev)) {
245 struct ethtool_link_ksettings cmd;
246
247 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
248 const char *duplex;
249
250 switch (cmd.base.duplex) {
251 case DUPLEX_HALF:
252 duplex = "half";
253 break;
254 case DUPLEX_FULL:
255 duplex = "full";
256 break;
257 default:
258 duplex = "unknown";
259 break;
260 }
261 ret = sysfs_emit(buf, "%s\n", duplex);
262 }
263 }
264 rtnl_unlock();
265 return ret;
266}
267static DEVICE_ATTR_RO(duplex);
268
269static ssize_t testing_show(struct device *dev,
270 struct device_attribute *attr, char *buf)
271{
272 struct net_device *netdev = to_net_dev(dev);
273
274 if (netif_running(netdev))
275 return sysfs_emit(buf, fmt_dec, !!netif_testing(netdev));
276
277 return -EINVAL;
278}
279static DEVICE_ATTR_RO(testing);
280
281static ssize_t dormant_show(struct device *dev,
282 struct device_attribute *attr, char *buf)
283{
284 struct net_device *netdev = to_net_dev(dev);
285
286 if (netif_running(netdev))
287 return sysfs_emit(buf, fmt_dec, !!netif_dormant(netdev));
288
289 return -EINVAL;
290}
291static DEVICE_ATTR_RO(dormant);
292
293static const char *const operstates[] = {
294 "unknown",
295 "notpresent", /* currently unused */
296 "down",
297 "lowerlayerdown",
298 "testing",
299 "dormant",
300 "up"
301};
302
303static ssize_t operstate_show(struct device *dev,
304 struct device_attribute *attr, char *buf)
305{
306 const struct net_device *netdev = to_net_dev(dev);
307 unsigned char operstate;
308
309 read_lock(&dev_base_lock);
310 operstate = netdev->operstate;
311 if (!netif_running(netdev))
312 operstate = IF_OPER_DOWN;
313 read_unlock(&dev_base_lock);
314
315 if (operstate >= ARRAY_SIZE(operstates))
316 return -EINVAL; /* should not happen */
317
318 return sysfs_emit(buf, "%s\n", operstates[operstate]);
319}
320static DEVICE_ATTR_RO(operstate);
321
322static ssize_t carrier_changes_show(struct device *dev,
323 struct device_attribute *attr,
324 char *buf)
325{
326 struct net_device *netdev = to_net_dev(dev);
327
328 return sysfs_emit(buf, fmt_dec,
329 atomic_read(&netdev->carrier_up_count) +
330 atomic_read(&netdev->carrier_down_count));
331}
332static DEVICE_ATTR_RO(carrier_changes);
333
334static ssize_t carrier_up_count_show(struct device *dev,
335 struct device_attribute *attr,
336 char *buf)
337{
338 struct net_device *netdev = to_net_dev(dev);
339
340 return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
341}
342static DEVICE_ATTR_RO(carrier_up_count);
343
344static ssize_t carrier_down_count_show(struct device *dev,
345 struct device_attribute *attr,
346 char *buf)
347{
348 struct net_device *netdev = to_net_dev(dev);
349
350 return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
351}
352static DEVICE_ATTR_RO(carrier_down_count);
353
354/* read-write attributes */
355
356static int change_mtu(struct net_device *dev, unsigned long new_mtu)
357{
358 return dev_set_mtu(dev, (int)new_mtu);
359}
360
361static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
362 const char *buf, size_t len)
363{
364 return netdev_store(dev, attr, buf, len, change_mtu);
365}
366NETDEVICE_SHOW_RW(mtu, fmt_dec);
367
368static int change_flags(struct net_device *dev, unsigned long new_flags)
369{
370 return dev_change_flags(dev, (unsigned int)new_flags, NULL);
371}
372
373static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
374 const char *buf, size_t len)
375{
376 return netdev_store(dev, attr, buf, len, change_flags);
377}
378NETDEVICE_SHOW_RW(flags, fmt_hex);
379
380static ssize_t tx_queue_len_store(struct device *dev,
381 struct device_attribute *attr,
382 const char *buf, size_t len)
383{
384 if (!capable(CAP_NET_ADMIN))
385 return -EPERM;
386
387 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
388}
389NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
390
391static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
392{
393 WRITE_ONCE(dev->gro_flush_timeout, val);
394 return 0;
395}
396
397static ssize_t gro_flush_timeout_store(struct device *dev,
398 struct device_attribute *attr,
399 const char *buf, size_t len)
400{
401 if (!capable(CAP_NET_ADMIN))
402 return -EPERM;
403
404 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
405}
406NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
407
408static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
409{
410 WRITE_ONCE(dev->napi_defer_hard_irqs, val);
411 return 0;
412}
413
414static ssize_t napi_defer_hard_irqs_store(struct device *dev,
415 struct device_attribute *attr,
416 const char *buf, size_t len)
417{
418 if (!capable(CAP_NET_ADMIN))
419 return -EPERM;
420
421 return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
422}
423NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec);
424
425static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
426 const char *buf, size_t len)
427{
428 struct net_device *netdev = to_net_dev(dev);
429 struct net *net = dev_net(netdev);
430 size_t count = len;
431 ssize_t ret = 0;
432
433 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
434 return -EPERM;
435
436 /* ignore trailing newline */
437 if (len > 0 && buf[len - 1] == '\n')
438 --count;
439
440 if (!rtnl_trylock())
441 return restart_syscall();
442
443 if (dev_isalive(netdev)) {
444 ret = dev_set_alias(netdev, buf, count);
445 if (ret < 0)
446 goto err;
447 ret = len;
448 netdev_state_change(netdev);
449 }
450err:
451 rtnl_unlock();
452
453 return ret;
454}
455
456static ssize_t ifalias_show(struct device *dev,
457 struct device_attribute *attr, char *buf)
458{
459 const struct net_device *netdev = to_net_dev(dev);
460 char tmp[IFALIASZ];
461 ssize_t ret = 0;
462
463 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
464 if (ret > 0)
465 ret = sysfs_emit(buf, "%s\n", tmp);
466 return ret;
467}
468static DEVICE_ATTR_RW(ifalias);
469
470static int change_group(struct net_device *dev, unsigned long new_group)
471{
472 dev_set_group(dev, (int)new_group);
473 return 0;
474}
475
476static ssize_t group_store(struct device *dev, struct device_attribute *attr,
477 const char *buf, size_t len)
478{
479 return netdev_store(dev, attr, buf, len, change_group);
480}
481NETDEVICE_SHOW(group, fmt_dec);
482static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
483
484static int change_proto_down(struct net_device *dev, unsigned long proto_down)
485{
486 return dev_change_proto_down(dev, (bool)proto_down);
487}
488
489static ssize_t proto_down_store(struct device *dev,
490 struct device_attribute *attr,
491 const char *buf, size_t len)
492{
493 return netdev_store(dev, attr, buf, len, change_proto_down);
494}
495NETDEVICE_SHOW_RW(proto_down, fmt_dec);
496
497static ssize_t phys_port_id_show(struct device *dev,
498 struct device_attribute *attr, char *buf)
499{
500 struct net_device *netdev = to_net_dev(dev);
501 ssize_t ret = -EINVAL;
502
503 /* The check is also done in dev_get_phys_port_id; this helps returning
504 * early without hitting the trylock/restart below.
505 */
506 if (!netdev->netdev_ops->ndo_get_phys_port_id)
507 return -EOPNOTSUPP;
508
509 if (!rtnl_trylock())
510 return restart_syscall();
511
512 if (dev_isalive(netdev)) {
513 struct netdev_phys_item_id ppid;
514
515 ret = dev_get_phys_port_id(netdev, &ppid);
516 if (!ret)
517 ret = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id);
518 }
519 rtnl_unlock();
520
521 return ret;
522}
523static DEVICE_ATTR_RO(phys_port_id);
524
525static ssize_t phys_port_name_show(struct device *dev,
526 struct device_attribute *attr, char *buf)
527{
528 struct net_device *netdev = to_net_dev(dev);
529 ssize_t ret = -EINVAL;
530
531 /* The checks are also done in dev_get_phys_port_name; this helps
532 * returning early without hitting the trylock/restart below.
533 */
534 if (!netdev->netdev_ops->ndo_get_phys_port_name &&
535 !netdev->devlink_port)
536 return -EOPNOTSUPP;
537
538 if (!rtnl_trylock())
539 return restart_syscall();
540
541 if (dev_isalive(netdev)) {
542 char name[IFNAMSIZ];
543
544 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
545 if (!ret)
546 ret = sysfs_emit(buf, "%s\n", name);
547 }
548 rtnl_unlock();
549
550 return ret;
551}
552static DEVICE_ATTR_RO(phys_port_name);
553
554static ssize_t phys_switch_id_show(struct device *dev,
555 struct device_attribute *attr, char *buf)
556{
557 struct net_device *netdev = to_net_dev(dev);
558 ssize_t ret = -EINVAL;
559
560 /* The checks are also done in dev_get_phys_port_name; this helps
561 * returning early without hitting the trylock/restart below. This works
562 * because recurse is false when calling dev_get_port_parent_id.
563 */
564 if (!netdev->netdev_ops->ndo_get_port_parent_id &&
565 !netdev->devlink_port)
566 return -EOPNOTSUPP;
567
568 if (!rtnl_trylock())
569 return restart_syscall();
570
571 if (dev_isalive(netdev)) {
572 struct netdev_phys_item_id ppid = { };
573
574 ret = dev_get_port_parent_id(netdev, &ppid, false);
575 if (!ret)
576 ret = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id);
577 }
578 rtnl_unlock();
579
580 return ret;
581}
582static DEVICE_ATTR_RO(phys_switch_id);
583
584static ssize_t threaded_show(struct device *dev,
585 struct device_attribute *attr, char *buf)
586{
587 struct net_device *netdev = to_net_dev(dev);
588 ssize_t ret = -EINVAL;
589
590 if (!rtnl_trylock())
591 return restart_syscall();
592
593 if (dev_isalive(netdev))
594 ret = sysfs_emit(buf, fmt_dec, netdev->threaded);
595
596 rtnl_unlock();
597 return ret;
598}
599
600static int modify_napi_threaded(struct net_device *dev, unsigned long val)
601{
602 int ret;
603
604 if (list_empty(&dev->napi_list))
605 return -EOPNOTSUPP;
606
607 if (val != 0 && val != 1)
608 return -EOPNOTSUPP;
609
610 ret = dev_set_threaded(dev, val);
611
612 return ret;
613}
614
615static ssize_t threaded_store(struct device *dev,
616 struct device_attribute *attr,
617 const char *buf, size_t len)
618{
619 return netdev_store(dev, attr, buf, len, modify_napi_threaded);
620}
621static DEVICE_ATTR_RW(threaded);
622
623static struct attribute *net_class_attrs[] __ro_after_init = {
624 &dev_attr_netdev_group.attr,
625 &dev_attr_type.attr,
626 &dev_attr_dev_id.attr,
627 &dev_attr_dev_port.attr,
628 &dev_attr_iflink.attr,
629 &dev_attr_ifindex.attr,
630 &dev_attr_name_assign_type.attr,
631 &dev_attr_addr_assign_type.attr,
632 &dev_attr_addr_len.attr,
633 &dev_attr_link_mode.attr,
634 &dev_attr_address.attr,
635 &dev_attr_broadcast.attr,
636 &dev_attr_speed.attr,
637 &dev_attr_duplex.attr,
638 &dev_attr_dormant.attr,
639 &dev_attr_testing.attr,
640 &dev_attr_operstate.attr,
641 &dev_attr_carrier_changes.attr,
642 &dev_attr_ifalias.attr,
643 &dev_attr_carrier.attr,
644 &dev_attr_mtu.attr,
645 &dev_attr_flags.attr,
646 &dev_attr_tx_queue_len.attr,
647 &dev_attr_gro_flush_timeout.attr,
648 &dev_attr_napi_defer_hard_irqs.attr,
649 &dev_attr_phys_port_id.attr,
650 &dev_attr_phys_port_name.attr,
651 &dev_attr_phys_switch_id.attr,
652 &dev_attr_proto_down.attr,
653 &dev_attr_carrier_up_count.attr,
654 &dev_attr_carrier_down_count.attr,
655 &dev_attr_threaded.attr,
656 NULL,
657};
658ATTRIBUTE_GROUPS(net_class);
659
660/* Show a given an attribute in the statistics group */
661static ssize_t netstat_show(const struct device *d,
662 struct device_attribute *attr, char *buf,
663 unsigned long offset)
664{
665 struct net_device *dev = to_net_dev(d);
666 ssize_t ret = -EINVAL;
667
668 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
669 offset % sizeof(u64) != 0);
670
671 read_lock(&dev_base_lock);
672 if (dev_isalive(dev)) {
673 struct rtnl_link_stats64 temp;
674 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
675
676 ret = sysfs_emit(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
677 }
678 read_unlock(&dev_base_lock);
679 return ret;
680}
681
682/* generate a read-only statistics attribute */
683#define NETSTAT_ENTRY(name) \
684static ssize_t name##_show(struct device *d, \
685 struct device_attribute *attr, char *buf) \
686{ \
687 return netstat_show(d, attr, buf, \
688 offsetof(struct rtnl_link_stats64, name)); \
689} \
690static DEVICE_ATTR_RO(name)
691
692NETSTAT_ENTRY(rx_packets);
693NETSTAT_ENTRY(tx_packets);
694NETSTAT_ENTRY(rx_bytes);
695NETSTAT_ENTRY(tx_bytes);
696NETSTAT_ENTRY(rx_errors);
697NETSTAT_ENTRY(tx_errors);
698NETSTAT_ENTRY(rx_dropped);
699NETSTAT_ENTRY(tx_dropped);
700NETSTAT_ENTRY(multicast);
701NETSTAT_ENTRY(collisions);
702NETSTAT_ENTRY(rx_length_errors);
703NETSTAT_ENTRY(rx_over_errors);
704NETSTAT_ENTRY(rx_crc_errors);
705NETSTAT_ENTRY(rx_frame_errors);
706NETSTAT_ENTRY(rx_fifo_errors);
707NETSTAT_ENTRY(rx_missed_errors);
708NETSTAT_ENTRY(tx_aborted_errors);
709NETSTAT_ENTRY(tx_carrier_errors);
710NETSTAT_ENTRY(tx_fifo_errors);
711NETSTAT_ENTRY(tx_heartbeat_errors);
712NETSTAT_ENTRY(tx_window_errors);
713NETSTAT_ENTRY(rx_compressed);
714NETSTAT_ENTRY(tx_compressed);
715NETSTAT_ENTRY(rx_nohandler);
716
717static struct attribute *netstat_attrs[] __ro_after_init = {
718 &dev_attr_rx_packets.attr,
719 &dev_attr_tx_packets.attr,
720 &dev_attr_rx_bytes.attr,
721 &dev_attr_tx_bytes.attr,
722 &dev_attr_rx_errors.attr,
723 &dev_attr_tx_errors.attr,
724 &dev_attr_rx_dropped.attr,
725 &dev_attr_tx_dropped.attr,
726 &dev_attr_multicast.attr,
727 &dev_attr_collisions.attr,
728 &dev_attr_rx_length_errors.attr,
729 &dev_attr_rx_over_errors.attr,
730 &dev_attr_rx_crc_errors.attr,
731 &dev_attr_rx_frame_errors.attr,
732 &dev_attr_rx_fifo_errors.attr,
733 &dev_attr_rx_missed_errors.attr,
734 &dev_attr_tx_aborted_errors.attr,
735 &dev_attr_tx_carrier_errors.attr,
736 &dev_attr_tx_fifo_errors.attr,
737 &dev_attr_tx_heartbeat_errors.attr,
738 &dev_attr_tx_window_errors.attr,
739 &dev_attr_rx_compressed.attr,
740 &dev_attr_tx_compressed.attr,
741 &dev_attr_rx_nohandler.attr,
742 NULL
743};
744
745static const struct attribute_group netstat_group = {
746 .name = "statistics",
747 .attrs = netstat_attrs,
748};
749
750static struct attribute *wireless_attrs[] = {
751 NULL
752};
753
754static const struct attribute_group wireless_group = {
755 .name = "wireless",
756 .attrs = wireless_attrs,
757};
758
759static bool wireless_group_needed(struct net_device *ndev)
760{
761#if IS_ENABLED(CONFIG_CFG80211)
762 if (ndev->ieee80211_ptr)
763 return true;
764#endif
765#if IS_ENABLED(CONFIG_WIRELESS_EXT)
766 if (ndev->wireless_handlers)
767 return true;
768#endif
769 return false;
770}
771
772#else /* CONFIG_SYSFS */
773#define net_class_groups NULL
774#endif /* CONFIG_SYSFS */
775
776#ifdef CONFIG_SYSFS
777#define to_rx_queue_attr(_attr) \
778 container_of(_attr, struct rx_queue_attribute, attr)
779
780#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
781
782static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
783 char *buf)
784{
785 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
786 struct netdev_rx_queue *queue = to_rx_queue(kobj);
787
788 if (!attribute->show)
789 return -EIO;
790
791 return attribute->show(queue, buf);
792}
793
794static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
795 const char *buf, size_t count)
796{
797 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
798 struct netdev_rx_queue *queue = to_rx_queue(kobj);
799
800 if (!attribute->store)
801 return -EIO;
802
803 return attribute->store(queue, buf, count);
804}
805
806static const struct sysfs_ops rx_queue_sysfs_ops = {
807 .show = rx_queue_attr_show,
808 .store = rx_queue_attr_store,
809};
810
811#ifdef CONFIG_RPS
812static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
813{
814 struct rps_map *map;
815 cpumask_var_t mask;
816 int i, len;
817
818 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
819 return -ENOMEM;
820
821 rcu_read_lock();
822 map = rcu_dereference(queue->rps_map);
823 if (map)
824 for (i = 0; i < map->len; i++)
825 cpumask_set_cpu(map->cpus[i], mask);
826
827 len = sysfs_emit(buf, "%*pb\n", cpumask_pr_args(mask));
828 rcu_read_unlock();
829 free_cpumask_var(mask);
830
831 return len < PAGE_SIZE ? len : -EINVAL;
832}
833
834static ssize_t store_rps_map(struct netdev_rx_queue *queue,
835 const char *buf, size_t len)
836{
837 struct rps_map *old_map, *map;
838 cpumask_var_t mask;
839 int err, cpu, i;
840 static DEFINE_MUTEX(rps_map_mutex);
841
842 if (!capable(CAP_NET_ADMIN))
843 return -EPERM;
844
845 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
846 return -ENOMEM;
847
848 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
849 if (err) {
850 free_cpumask_var(mask);
851 return err;
852 }
853
854 if (!cpumask_empty(mask)) {
855 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN));
856 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ));
857 if (cpumask_empty(mask)) {
858 free_cpumask_var(mask);
859 return -EINVAL;
860 }
861 }
862
863 map = kzalloc(max_t(unsigned int,
864 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
865 GFP_KERNEL);
866 if (!map) {
867 free_cpumask_var(mask);
868 return -ENOMEM;
869 }
870
871 i = 0;
872 for_each_cpu_and(cpu, mask, cpu_online_mask)
873 map->cpus[i++] = cpu;
874
875 if (i) {
876 map->len = i;
877 } else {
878 kfree(map);
879 map = NULL;
880 }
881
882 mutex_lock(&rps_map_mutex);
883 old_map = rcu_dereference_protected(queue->rps_map,
884 mutex_is_locked(&rps_map_mutex));
885 rcu_assign_pointer(queue->rps_map, map);
886
887 if (map)
888 static_branch_inc(&rps_needed);
889 if (old_map)
890 static_branch_dec(&rps_needed);
891
892 mutex_unlock(&rps_map_mutex);
893
894 if (old_map)
895 kfree_rcu(old_map, rcu);
896
897 free_cpumask_var(mask);
898 return len;
899}
900
901static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
902 char *buf)
903{
904 struct rps_dev_flow_table *flow_table;
905 unsigned long val = 0;
906
907 rcu_read_lock();
908 flow_table = rcu_dereference(queue->rps_flow_table);
909 if (flow_table)
910 val = (unsigned long)flow_table->mask + 1;
911 rcu_read_unlock();
912
913 return sysfs_emit(buf, "%lu\n", val);
914}
915
916static void rps_dev_flow_table_release(struct rcu_head *rcu)
917{
918 struct rps_dev_flow_table *table = container_of(rcu,
919 struct rps_dev_flow_table, rcu);
920 vfree(table);
921}
922
923static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
924 const char *buf, size_t len)
925{
926 unsigned long mask, count;
927 struct rps_dev_flow_table *table, *old_table;
928 static DEFINE_SPINLOCK(rps_dev_flow_lock);
929 int rc;
930
931 if (!capable(CAP_NET_ADMIN))
932 return -EPERM;
933
934 rc = kstrtoul(buf, 0, &count);
935 if (rc < 0)
936 return rc;
937
938 if (count) {
939 mask = count - 1;
940 /* mask = roundup_pow_of_two(count) - 1;
941 * without overflows...
942 */
943 while ((mask | (mask >> 1)) != mask)
944 mask |= (mask >> 1);
945 /* On 64 bit arches, must check mask fits in table->mask (u32),
946 * and on 32bit arches, must check
947 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
948 */
949#if BITS_PER_LONG > 32
950 if (mask > (unsigned long)(u32)mask)
951 return -EINVAL;
952#else
953 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
954 / sizeof(struct rps_dev_flow)) {
955 /* Enforce a limit to prevent overflow */
956 return -EINVAL;
957 }
958#endif
959 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
960 if (!table)
961 return -ENOMEM;
962
963 table->mask = mask;
964 for (count = 0; count <= mask; count++)
965 table->flows[count].cpu = RPS_NO_CPU;
966 } else {
967 table = NULL;
968 }
969
970 spin_lock(&rps_dev_flow_lock);
971 old_table = rcu_dereference_protected(queue->rps_flow_table,
972 lockdep_is_held(&rps_dev_flow_lock));
973 rcu_assign_pointer(queue->rps_flow_table, table);
974 spin_unlock(&rps_dev_flow_lock);
975
976 if (old_table)
977 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
978
979 return len;
980}
981
982static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
983 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
984
985static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
986 = __ATTR(rps_flow_cnt, 0644,
987 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
988#endif /* CONFIG_RPS */
989
990static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
991#ifdef CONFIG_RPS
992 &rps_cpus_attribute.attr,
993 &rps_dev_flow_table_cnt_attribute.attr,
994#endif
995 NULL
996};
997ATTRIBUTE_GROUPS(rx_queue_default);
998
999static void rx_queue_release(struct kobject *kobj)
1000{
1001 struct netdev_rx_queue *queue = to_rx_queue(kobj);
1002#ifdef CONFIG_RPS
1003 struct rps_map *map;
1004 struct rps_dev_flow_table *flow_table;
1005
1006 map = rcu_dereference_protected(queue->rps_map, 1);
1007 if (map) {
1008 RCU_INIT_POINTER(queue->rps_map, NULL);
1009 kfree_rcu(map, rcu);
1010 }
1011
1012 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
1013 if (flow_table) {
1014 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
1015 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
1016 }
1017#endif
1018
1019 memset(kobj, 0, sizeof(*kobj));
1020 netdev_put(queue->dev, &queue->dev_tracker);
1021}
1022
1023static const void *rx_queue_namespace(const struct kobject *kobj)
1024{
1025 struct netdev_rx_queue *queue = to_rx_queue(kobj);
1026 struct device *dev = &queue->dev->dev;
1027 const void *ns = NULL;
1028
1029 if (dev->class && dev->class->ns_type)
1030 ns = dev->class->namespace(dev);
1031
1032 return ns;
1033}
1034
1035static void rx_queue_get_ownership(const struct kobject *kobj,
1036 kuid_t *uid, kgid_t *gid)
1037{
1038 const struct net *net = rx_queue_namespace(kobj);
1039
1040 net_ns_get_ownership(net, uid, gid);
1041}
1042
1043static struct kobj_type rx_queue_ktype __ro_after_init = {
1044 .sysfs_ops = &rx_queue_sysfs_ops,
1045 .release = rx_queue_release,
1046 .default_groups = rx_queue_default_groups,
1047 .namespace = rx_queue_namespace,
1048 .get_ownership = rx_queue_get_ownership,
1049};
1050
1051static int rx_queue_add_kobject(struct net_device *dev, int index)
1052{
1053 struct netdev_rx_queue *queue = dev->_rx + index;
1054 struct kobject *kobj = &queue->kobj;
1055 int error = 0;
1056
1057 /* Kobject_put later will trigger rx_queue_release call which
1058 * decreases dev refcount: Take that reference here
1059 */
1060 netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1061
1062 kobj->kset = dev->queues_kset;
1063 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
1064 "rx-%u", index);
1065 if (error)
1066 goto err;
1067
1068 if (dev->sysfs_rx_queue_group) {
1069 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
1070 if (error)
1071 goto err;
1072 }
1073
1074 kobject_uevent(kobj, KOBJ_ADD);
1075
1076 return error;
1077
1078err:
1079 kobject_put(kobj);
1080 return error;
1081}
1082
1083static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
1084 kgid_t kgid)
1085{
1086 struct netdev_rx_queue *queue = dev->_rx + index;
1087 struct kobject *kobj = &queue->kobj;
1088 int error;
1089
1090 error = sysfs_change_owner(kobj, kuid, kgid);
1091 if (error)
1092 return error;
1093
1094 if (dev->sysfs_rx_queue_group)
1095 error = sysfs_group_change_owner(
1096 kobj, dev->sysfs_rx_queue_group, kuid, kgid);
1097
1098 return error;
1099}
1100#endif /* CONFIG_SYSFS */
1101
1102int
1103net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1104{
1105#ifdef CONFIG_SYSFS
1106 int i;
1107 int error = 0;
1108
1109#ifndef CONFIG_RPS
1110 if (!dev->sysfs_rx_queue_group)
1111 return 0;
1112#endif
1113 for (i = old_num; i < new_num; i++) {
1114 error = rx_queue_add_kobject(dev, i);
1115 if (error) {
1116 new_num = old_num;
1117 break;
1118 }
1119 }
1120
1121 while (--i >= new_num) {
1122 struct kobject *kobj = &dev->_rx[i].kobj;
1123
1124 if (!refcount_read(&dev_net(dev)->ns.count))
1125 kobj->uevent_suppress = 1;
1126 if (dev->sysfs_rx_queue_group)
1127 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1128 kobject_put(kobj);
1129 }
1130
1131 return error;
1132#else
1133 return 0;
1134#endif
1135}
1136
1137static int net_rx_queue_change_owner(struct net_device *dev, int num,
1138 kuid_t kuid, kgid_t kgid)
1139{
1140#ifdef CONFIG_SYSFS
1141 int error = 0;
1142 int i;
1143
1144#ifndef CONFIG_RPS
1145 if (!dev->sysfs_rx_queue_group)
1146 return 0;
1147#endif
1148 for (i = 0; i < num; i++) {
1149 error = rx_queue_change_owner(dev, i, kuid, kgid);
1150 if (error)
1151 break;
1152 }
1153
1154 return error;
1155#else
1156 return 0;
1157#endif
1158}
1159
1160#ifdef CONFIG_SYSFS
1161/*
1162 * netdev_queue sysfs structures and functions.
1163 */
1164struct netdev_queue_attribute {
1165 struct attribute attr;
1166 ssize_t (*show)(struct netdev_queue *queue, char *buf);
1167 ssize_t (*store)(struct netdev_queue *queue,
1168 const char *buf, size_t len);
1169};
1170#define to_netdev_queue_attr(_attr) \
1171 container_of(_attr, struct netdev_queue_attribute, attr)
1172
1173#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1174
1175static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1176 struct attribute *attr, char *buf)
1177{
1178 const struct netdev_queue_attribute *attribute
1179 = to_netdev_queue_attr(attr);
1180 struct netdev_queue *queue = to_netdev_queue(kobj);
1181
1182 if (!attribute->show)
1183 return -EIO;
1184
1185 return attribute->show(queue, buf);
1186}
1187
1188static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1189 struct attribute *attr,
1190 const char *buf, size_t count)
1191{
1192 const struct netdev_queue_attribute *attribute
1193 = to_netdev_queue_attr(attr);
1194 struct netdev_queue *queue = to_netdev_queue(kobj);
1195
1196 if (!attribute->store)
1197 return -EIO;
1198
1199 return attribute->store(queue, buf, count);
1200}
1201
1202static const struct sysfs_ops netdev_queue_sysfs_ops = {
1203 .show = netdev_queue_attr_show,
1204 .store = netdev_queue_attr_store,
1205};
1206
1207static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1208{
1209 unsigned long trans_timeout = atomic_long_read(&queue->trans_timeout);
1210
1211 return sysfs_emit(buf, fmt_ulong, trans_timeout);
1212}
1213
1214static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1215{
1216 struct net_device *dev = queue->dev;
1217 unsigned int i;
1218
1219 i = queue - dev->_tx;
1220 BUG_ON(i >= dev->num_tx_queues);
1221
1222 return i;
1223}
1224
1225static ssize_t traffic_class_show(struct netdev_queue *queue,
1226 char *buf)
1227{
1228 struct net_device *dev = queue->dev;
1229 int num_tc, tc;
1230 int index;
1231
1232 if (!netif_is_multiqueue(dev))
1233 return -ENOENT;
1234
1235 if (!rtnl_trylock())
1236 return restart_syscall();
1237
1238 index = get_netdev_queue_index(queue);
1239
1240 /* If queue belongs to subordinate dev use its TC mapping */
1241 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1242
1243 num_tc = dev->num_tc;
1244 tc = netdev_txq_to_tc(dev, index);
1245
1246 rtnl_unlock();
1247
1248 if (tc < 0)
1249 return -EINVAL;
1250
1251 /* We can report the traffic class one of two ways:
1252 * Subordinate device traffic classes are reported with the traffic
1253 * class first, and then the subordinate class so for example TC0 on
1254 * subordinate device 2 will be reported as "0-2". If the queue
1255 * belongs to the root device it will be reported with just the
1256 * traffic class, so just "0" for TC 0 for example.
1257 */
1258 return num_tc < 0 ? sysfs_emit(buf, "%d%d\n", tc, num_tc) :
1259 sysfs_emit(buf, "%d\n", tc);
1260}
1261
1262#ifdef CONFIG_XPS
1263static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1264 char *buf)
1265{
1266 return sysfs_emit(buf, "%lu\n", queue->tx_maxrate);
1267}
1268
1269static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1270 const char *buf, size_t len)
1271{
1272 struct net_device *dev = queue->dev;
1273 int err, index = get_netdev_queue_index(queue);
1274 u32 rate = 0;
1275
1276 if (!capable(CAP_NET_ADMIN))
1277 return -EPERM;
1278
1279 /* The check is also done later; this helps returning early without
1280 * hitting the trylock/restart below.
1281 */
1282 if (!dev->netdev_ops->ndo_set_tx_maxrate)
1283 return -EOPNOTSUPP;
1284
1285 err = kstrtou32(buf, 10, &rate);
1286 if (err < 0)
1287 return err;
1288
1289 if (!rtnl_trylock())
1290 return restart_syscall();
1291
1292 err = -EOPNOTSUPP;
1293 if (dev->netdev_ops->ndo_set_tx_maxrate)
1294 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1295
1296 rtnl_unlock();
1297 if (!err) {
1298 queue->tx_maxrate = rate;
1299 return len;
1300 }
1301 return err;
1302}
1303
1304static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1305 = __ATTR_RW(tx_maxrate);
1306#endif
1307
1308static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1309 = __ATTR_RO(tx_timeout);
1310
1311static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1312 = __ATTR_RO(traffic_class);
1313
1314#ifdef CONFIG_BQL
1315/*
1316 * Byte queue limits sysfs structures and functions.
1317 */
1318static ssize_t bql_show(char *buf, unsigned int value)
1319{
1320 return sysfs_emit(buf, "%u\n", value);
1321}
1322
1323static ssize_t bql_set(const char *buf, const size_t count,
1324 unsigned int *pvalue)
1325{
1326 unsigned int value;
1327 int err;
1328
1329 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1330 value = DQL_MAX_LIMIT;
1331 } else {
1332 err = kstrtouint(buf, 10, &value);
1333 if (err < 0)
1334 return err;
1335 if (value > DQL_MAX_LIMIT)
1336 return -EINVAL;
1337 }
1338
1339 *pvalue = value;
1340
1341 return count;
1342}
1343
1344static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1345 char *buf)
1346{
1347 struct dql *dql = &queue->dql;
1348
1349 return sysfs_emit(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1350}
1351
1352static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1353 const char *buf, size_t len)
1354{
1355 struct dql *dql = &queue->dql;
1356 unsigned int value;
1357 int err;
1358
1359 err = kstrtouint(buf, 10, &value);
1360 if (err < 0)
1361 return err;
1362
1363 dql->slack_hold_time = msecs_to_jiffies(value);
1364
1365 return len;
1366}
1367
1368static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1369 = __ATTR(hold_time, 0644,
1370 bql_show_hold_time, bql_set_hold_time);
1371
1372static ssize_t bql_show_inflight(struct netdev_queue *queue,
1373 char *buf)
1374{
1375 struct dql *dql = &queue->dql;
1376
1377 return sysfs_emit(buf, "%u\n", dql->num_queued - dql->num_completed);
1378}
1379
1380static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1381 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1382
1383#define BQL_ATTR(NAME, FIELD) \
1384static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1385 char *buf) \
1386{ \
1387 return bql_show(buf, queue->dql.FIELD); \
1388} \
1389 \
1390static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1391 const char *buf, size_t len) \
1392{ \
1393 return bql_set(buf, len, &queue->dql.FIELD); \
1394} \
1395 \
1396static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1397 = __ATTR(NAME, 0644, \
1398 bql_show_ ## NAME, bql_set_ ## NAME)
1399
1400BQL_ATTR(limit, limit);
1401BQL_ATTR(limit_max, max_limit);
1402BQL_ATTR(limit_min, min_limit);
1403
1404static struct attribute *dql_attrs[] __ro_after_init = {
1405 &bql_limit_attribute.attr,
1406 &bql_limit_max_attribute.attr,
1407 &bql_limit_min_attribute.attr,
1408 &bql_hold_time_attribute.attr,
1409 &bql_inflight_attribute.attr,
1410 NULL
1411};
1412
1413static const struct attribute_group dql_group = {
1414 .name = "byte_queue_limits",
1415 .attrs = dql_attrs,
1416};
1417#endif /* CONFIG_BQL */
1418
1419#ifdef CONFIG_XPS
1420static ssize_t xps_queue_show(struct net_device *dev, unsigned int index,
1421 int tc, char *buf, enum xps_map_type type)
1422{
1423 struct xps_dev_maps *dev_maps;
1424 unsigned long *mask;
1425 unsigned int nr_ids;
1426 int j, len;
1427
1428 rcu_read_lock();
1429 dev_maps = rcu_dereference(dev->xps_maps[type]);
1430
1431 /* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0
1432 * when dev_maps hasn't been allocated yet, to be backward compatible.
1433 */
1434 nr_ids = dev_maps ? dev_maps->nr_ids :
1435 (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues);
1436
1437 mask = bitmap_zalloc(nr_ids, GFP_NOWAIT);
1438 if (!mask) {
1439 rcu_read_unlock();
1440 return -ENOMEM;
1441 }
1442
1443 if (!dev_maps || tc >= dev_maps->num_tc)
1444 goto out_no_maps;
1445
1446 for (j = 0; j < nr_ids; j++) {
1447 int i, tci = j * dev_maps->num_tc + tc;
1448 struct xps_map *map;
1449
1450 map = rcu_dereference(dev_maps->attr_map[tci]);
1451 if (!map)
1452 continue;
1453
1454 for (i = map->len; i--;) {
1455 if (map->queues[i] == index) {
1456 __set_bit(j, mask);
1457 break;
1458 }
1459 }
1460 }
1461out_no_maps:
1462 rcu_read_unlock();
1463
1464 len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids);
1465 bitmap_free(mask);
1466
1467 return len < PAGE_SIZE ? len : -EINVAL;
1468}
1469
1470static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf)
1471{
1472 struct net_device *dev = queue->dev;
1473 unsigned int index;
1474 int len, tc;
1475
1476 if (!netif_is_multiqueue(dev))
1477 return -ENOENT;
1478
1479 index = get_netdev_queue_index(queue);
1480
1481 if (!rtnl_trylock())
1482 return restart_syscall();
1483
1484 /* If queue belongs to subordinate dev use its map */
1485 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1486
1487 tc = netdev_txq_to_tc(dev, index);
1488 if (tc < 0) {
1489 rtnl_unlock();
1490 return -EINVAL;
1491 }
1492
1493 /* Make sure the subordinate device can't be freed */
1494 get_device(&dev->dev);
1495 rtnl_unlock();
1496
1497 len = xps_queue_show(dev, index, tc, buf, XPS_CPUS);
1498
1499 put_device(&dev->dev);
1500 return len;
1501}
1502
1503static ssize_t xps_cpus_store(struct netdev_queue *queue,
1504 const char *buf, size_t len)
1505{
1506 struct net_device *dev = queue->dev;
1507 unsigned int index;
1508 cpumask_var_t mask;
1509 int err;
1510
1511 if (!netif_is_multiqueue(dev))
1512 return -ENOENT;
1513
1514 if (!capable(CAP_NET_ADMIN))
1515 return -EPERM;
1516
1517 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1518 return -ENOMEM;
1519
1520 index = get_netdev_queue_index(queue);
1521
1522 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1523 if (err) {
1524 free_cpumask_var(mask);
1525 return err;
1526 }
1527
1528 if (!rtnl_trylock()) {
1529 free_cpumask_var(mask);
1530 return restart_syscall();
1531 }
1532
1533 err = netif_set_xps_queue(dev, mask, index);
1534 rtnl_unlock();
1535
1536 free_cpumask_var(mask);
1537
1538 return err ? : len;
1539}
1540
1541static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1542 = __ATTR_RW(xps_cpus);
1543
1544static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1545{
1546 struct net_device *dev = queue->dev;
1547 unsigned int index;
1548 int tc;
1549
1550 index = get_netdev_queue_index(queue);
1551
1552 if (!rtnl_trylock())
1553 return restart_syscall();
1554
1555 tc = netdev_txq_to_tc(dev, index);
1556 rtnl_unlock();
1557 if (tc < 0)
1558 return -EINVAL;
1559
1560 return xps_queue_show(dev, index, tc, buf, XPS_RXQS);
1561}
1562
1563static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1564 size_t len)
1565{
1566 struct net_device *dev = queue->dev;
1567 struct net *net = dev_net(dev);
1568 unsigned long *mask;
1569 unsigned int index;
1570 int err;
1571
1572 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1573 return -EPERM;
1574
1575 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1576 if (!mask)
1577 return -ENOMEM;
1578
1579 index = get_netdev_queue_index(queue);
1580
1581 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1582 if (err) {
1583 bitmap_free(mask);
1584 return err;
1585 }
1586
1587 if (!rtnl_trylock()) {
1588 bitmap_free(mask);
1589 return restart_syscall();
1590 }
1591
1592 cpus_read_lock();
1593 err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS);
1594 cpus_read_unlock();
1595
1596 rtnl_unlock();
1597
1598 bitmap_free(mask);
1599 return err ? : len;
1600}
1601
1602static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1603 = __ATTR_RW(xps_rxqs);
1604#endif /* CONFIG_XPS */
1605
1606static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1607 &queue_trans_timeout.attr,
1608 &queue_traffic_class.attr,
1609#ifdef CONFIG_XPS
1610 &xps_cpus_attribute.attr,
1611 &xps_rxqs_attribute.attr,
1612 &queue_tx_maxrate.attr,
1613#endif
1614 NULL
1615};
1616ATTRIBUTE_GROUPS(netdev_queue_default);
1617
1618static void netdev_queue_release(struct kobject *kobj)
1619{
1620 struct netdev_queue *queue = to_netdev_queue(kobj);
1621
1622 memset(kobj, 0, sizeof(*kobj));
1623 netdev_put(queue->dev, &queue->dev_tracker);
1624}
1625
1626static const void *netdev_queue_namespace(const struct kobject *kobj)
1627{
1628 struct netdev_queue *queue = to_netdev_queue(kobj);
1629 struct device *dev = &queue->dev->dev;
1630 const void *ns = NULL;
1631
1632 if (dev->class && dev->class->ns_type)
1633 ns = dev->class->namespace(dev);
1634
1635 return ns;
1636}
1637
1638static void netdev_queue_get_ownership(const struct kobject *kobj,
1639 kuid_t *uid, kgid_t *gid)
1640{
1641 const struct net *net = netdev_queue_namespace(kobj);
1642
1643 net_ns_get_ownership(net, uid, gid);
1644}
1645
1646static struct kobj_type netdev_queue_ktype __ro_after_init = {
1647 .sysfs_ops = &netdev_queue_sysfs_ops,
1648 .release = netdev_queue_release,
1649 .default_groups = netdev_queue_default_groups,
1650 .namespace = netdev_queue_namespace,
1651 .get_ownership = netdev_queue_get_ownership,
1652};
1653
1654static int netdev_queue_add_kobject(struct net_device *dev, int index)
1655{
1656 struct netdev_queue *queue = dev->_tx + index;
1657 struct kobject *kobj = &queue->kobj;
1658 int error = 0;
1659
1660 /* Kobject_put later will trigger netdev_queue_release call
1661 * which decreases dev refcount: Take that reference here
1662 */
1663 netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1664
1665 kobj->kset = dev->queues_kset;
1666 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1667 "tx-%u", index);
1668 if (error)
1669 goto err;
1670
1671#ifdef CONFIG_BQL
1672 error = sysfs_create_group(kobj, &dql_group);
1673 if (error)
1674 goto err;
1675#endif
1676
1677 kobject_uevent(kobj, KOBJ_ADD);
1678 return 0;
1679
1680err:
1681 kobject_put(kobj);
1682 return error;
1683}
1684
1685static int tx_queue_change_owner(struct net_device *ndev, int index,
1686 kuid_t kuid, kgid_t kgid)
1687{
1688 struct netdev_queue *queue = ndev->_tx + index;
1689 struct kobject *kobj = &queue->kobj;
1690 int error;
1691
1692 error = sysfs_change_owner(kobj, kuid, kgid);
1693 if (error)
1694 return error;
1695
1696#ifdef CONFIG_BQL
1697 error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1698#endif
1699 return error;
1700}
1701#endif /* CONFIG_SYSFS */
1702
1703int
1704netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1705{
1706#ifdef CONFIG_SYSFS
1707 int i;
1708 int error = 0;
1709
1710 /* Tx queue kobjects are allowed to be updated when a device is being
1711 * unregistered, but solely to remove queues from qdiscs. Any path
1712 * adding queues should be fixed.
1713 */
1714 WARN(dev->reg_state == NETREG_UNREGISTERING && new_num > old_num,
1715 "New queues can't be registered after device unregistration.");
1716
1717 for (i = old_num; i < new_num; i++) {
1718 error = netdev_queue_add_kobject(dev, i);
1719 if (error) {
1720 new_num = old_num;
1721 break;
1722 }
1723 }
1724
1725 while (--i >= new_num) {
1726 struct netdev_queue *queue = dev->_tx + i;
1727
1728 if (!refcount_read(&dev_net(dev)->ns.count))
1729 queue->kobj.uevent_suppress = 1;
1730#ifdef CONFIG_BQL
1731 sysfs_remove_group(&queue->kobj, &dql_group);
1732#endif
1733 kobject_put(&queue->kobj);
1734 }
1735
1736 return error;
1737#else
1738 return 0;
1739#endif /* CONFIG_SYSFS */
1740}
1741
1742static int net_tx_queue_change_owner(struct net_device *dev, int num,
1743 kuid_t kuid, kgid_t kgid)
1744{
1745#ifdef CONFIG_SYSFS
1746 int error = 0;
1747 int i;
1748
1749 for (i = 0; i < num; i++) {
1750 error = tx_queue_change_owner(dev, i, kuid, kgid);
1751 if (error)
1752 break;
1753 }
1754
1755 return error;
1756#else
1757 return 0;
1758#endif /* CONFIG_SYSFS */
1759}
1760
1761static int register_queue_kobjects(struct net_device *dev)
1762{
1763 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1764
1765#ifdef CONFIG_SYSFS
1766 dev->queues_kset = kset_create_and_add("queues",
1767 NULL, &dev->dev.kobj);
1768 if (!dev->queues_kset)
1769 return -ENOMEM;
1770 real_rx = dev->real_num_rx_queues;
1771#endif
1772 real_tx = dev->real_num_tx_queues;
1773
1774 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1775 if (error)
1776 goto error;
1777 rxq = real_rx;
1778
1779 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1780 if (error)
1781 goto error;
1782 txq = real_tx;
1783
1784 return 0;
1785
1786error:
1787 netdev_queue_update_kobjects(dev, txq, 0);
1788 net_rx_queue_update_kobjects(dev, rxq, 0);
1789#ifdef CONFIG_SYSFS
1790 kset_unregister(dev->queues_kset);
1791#endif
1792 return error;
1793}
1794
1795static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1796{
1797 int error = 0, real_rx = 0, real_tx = 0;
1798
1799#ifdef CONFIG_SYSFS
1800 if (ndev->queues_kset) {
1801 error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1802 if (error)
1803 return error;
1804 }
1805 real_rx = ndev->real_num_rx_queues;
1806#endif
1807 real_tx = ndev->real_num_tx_queues;
1808
1809 error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1810 if (error)
1811 return error;
1812
1813 error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1814 if (error)
1815 return error;
1816
1817 return 0;
1818}
1819
1820static void remove_queue_kobjects(struct net_device *dev)
1821{
1822 int real_rx = 0, real_tx = 0;
1823
1824#ifdef CONFIG_SYSFS
1825 real_rx = dev->real_num_rx_queues;
1826#endif
1827 real_tx = dev->real_num_tx_queues;
1828
1829 net_rx_queue_update_kobjects(dev, real_rx, 0);
1830 netdev_queue_update_kobjects(dev, real_tx, 0);
1831
1832 dev->real_num_rx_queues = 0;
1833 dev->real_num_tx_queues = 0;
1834#ifdef CONFIG_SYSFS
1835 kset_unregister(dev->queues_kset);
1836#endif
1837}
1838
1839static bool net_current_may_mount(void)
1840{
1841 struct net *net = current->nsproxy->net_ns;
1842
1843 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1844}
1845
1846static void *net_grab_current_ns(void)
1847{
1848 struct net *ns = current->nsproxy->net_ns;
1849#ifdef CONFIG_NET_NS
1850 if (ns)
1851 refcount_inc(&ns->passive);
1852#endif
1853 return ns;
1854}
1855
1856static const void *net_initial_ns(void)
1857{
1858 return &init_net;
1859}
1860
1861static const void *net_netlink_ns(struct sock *sk)
1862{
1863 return sock_net(sk);
1864}
1865
1866const struct kobj_ns_type_operations net_ns_type_operations = {
1867 .type = KOBJ_NS_TYPE_NET,
1868 .current_may_mount = net_current_may_mount,
1869 .grab_current_ns = net_grab_current_ns,
1870 .netlink_ns = net_netlink_ns,
1871 .initial_ns = net_initial_ns,
1872 .drop_ns = net_drop_ns,
1873};
1874EXPORT_SYMBOL_GPL(net_ns_type_operations);
1875
1876static int netdev_uevent(const struct device *d, struct kobj_uevent_env *env)
1877{
1878 const struct net_device *dev = to_net_dev(d);
1879 int retval;
1880
1881 /* pass interface to uevent. */
1882 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1883 if (retval)
1884 goto exit;
1885
1886 /* pass ifindex to uevent.
1887 * ifindex is useful as it won't change (interface name may change)
1888 * and is what RtNetlink uses natively.
1889 */
1890 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1891
1892exit:
1893 return retval;
1894}
1895
1896/*
1897 * netdev_release -- destroy and free a dead device.
1898 * Called when last reference to device kobject is gone.
1899 */
1900static void netdev_release(struct device *d)
1901{
1902 struct net_device *dev = to_net_dev(d);
1903
1904 BUG_ON(dev->reg_state != NETREG_RELEASED);
1905
1906 /* no need to wait for rcu grace period:
1907 * device is dead and about to be freed.
1908 */
1909 kfree(rcu_access_pointer(dev->ifalias));
1910 netdev_freemem(dev);
1911}
1912
1913static const void *net_namespace(const struct device *d)
1914{
1915 const struct net_device *dev = to_net_dev(d);
1916
1917 return dev_net(dev);
1918}
1919
1920static void net_get_ownership(const struct device *d, kuid_t *uid, kgid_t *gid)
1921{
1922 const struct net_device *dev = to_net_dev(d);
1923 const struct net *net = dev_net(dev);
1924
1925 net_ns_get_ownership(net, uid, gid);
1926}
1927
1928static struct class net_class __ro_after_init = {
1929 .name = "net",
1930 .dev_release = netdev_release,
1931 .dev_groups = net_class_groups,
1932 .dev_uevent = netdev_uevent,
1933 .ns_type = &net_ns_type_operations,
1934 .namespace = net_namespace,
1935 .get_ownership = net_get_ownership,
1936};
1937
1938#ifdef CONFIG_OF
1939static int of_dev_node_match(struct device *dev, const void *data)
1940{
1941 for (; dev; dev = dev->parent) {
1942 if (dev->of_node == data)
1943 return 1;
1944 }
1945
1946 return 0;
1947}
1948
1949/*
1950 * of_find_net_device_by_node - lookup the net device for the device node
1951 * @np: OF device node
1952 *
1953 * Looks up the net_device structure corresponding with the device node.
1954 * If successful, returns a pointer to the net_device with the embedded
1955 * struct device refcount incremented by one, or NULL on failure. The
1956 * refcount must be dropped when done with the net_device.
1957 */
1958struct net_device *of_find_net_device_by_node(struct device_node *np)
1959{
1960 struct device *dev;
1961
1962 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1963 if (!dev)
1964 return NULL;
1965
1966 return to_net_dev(dev);
1967}
1968EXPORT_SYMBOL(of_find_net_device_by_node);
1969#endif
1970
1971/* Delete sysfs entries but hold kobject reference until after all
1972 * netdev references are gone.
1973 */
1974void netdev_unregister_kobject(struct net_device *ndev)
1975{
1976 struct device *dev = &ndev->dev;
1977
1978 if (!refcount_read(&dev_net(ndev)->ns.count))
1979 dev_set_uevent_suppress(dev, 1);
1980
1981 kobject_get(&dev->kobj);
1982
1983 remove_queue_kobjects(ndev);
1984
1985 pm_runtime_set_memalloc_noio(dev, false);
1986
1987 device_del(dev);
1988}
1989
1990/* Create sysfs entries for network device. */
1991int netdev_register_kobject(struct net_device *ndev)
1992{
1993 struct device *dev = &ndev->dev;
1994 const struct attribute_group **groups = ndev->sysfs_groups;
1995 int error = 0;
1996
1997 device_initialize(dev);
1998 dev->class = &net_class;
1999 dev->platform_data = ndev;
2000 dev->groups = groups;
2001
2002 dev_set_name(dev, "%s", ndev->name);
2003
2004#ifdef CONFIG_SYSFS
2005 /* Allow for a device specific group */
2006 if (*groups)
2007 groups++;
2008
2009 *groups++ = &netstat_group;
2010
2011 if (wireless_group_needed(ndev))
2012 *groups++ = &wireless_group;
2013#endif /* CONFIG_SYSFS */
2014
2015 error = device_add(dev);
2016 if (error)
2017 return error;
2018
2019 error = register_queue_kobjects(ndev);
2020 if (error) {
2021 device_del(dev);
2022 return error;
2023 }
2024
2025 pm_runtime_set_memalloc_noio(dev, true);
2026
2027 return error;
2028}
2029
2030/* Change owner for sysfs entries when moving network devices across network
2031 * namespaces owned by different user namespaces.
2032 */
2033int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
2034 const struct net *net_new)
2035{
2036 kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID;
2037 kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID;
2038 struct device *dev = &ndev->dev;
2039 int error;
2040
2041 net_ns_get_ownership(net_old, &old_uid, &old_gid);
2042 net_ns_get_ownership(net_new, &new_uid, &new_gid);
2043
2044 /* The network namespace was changed but the owning user namespace is
2045 * identical so there's no need to change the owner of sysfs entries.
2046 */
2047 if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
2048 return 0;
2049
2050 error = device_change_owner(dev, new_uid, new_gid);
2051 if (error)
2052 return error;
2053
2054 error = queue_change_owner(ndev, new_uid, new_gid);
2055 if (error)
2056 return error;
2057
2058 return 0;
2059}
2060
2061int netdev_class_create_file_ns(const struct class_attribute *class_attr,
2062 const void *ns)
2063{
2064 return class_create_file_ns(&net_class, class_attr, ns);
2065}
2066EXPORT_SYMBOL(netdev_class_create_file_ns);
2067
2068void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
2069 const void *ns)
2070{
2071 class_remove_file_ns(&net_class, class_attr, ns);
2072}
2073EXPORT_SYMBOL(netdev_class_remove_file_ns);
2074
2075int __init netdev_kobject_init(void)
2076{
2077 kobj_ns_type_register(&net_ns_type_operations);
2078 return class_register(&net_class);
2079}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net-sysfs.c - network device class and attributes
4 *
5 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
6 */
7
8#include <linux/capability.h>
9#include <linux/kernel.h>
10#include <linux/netdevice.h>
11#include <linux/if_arp.h>
12#include <linux/slab.h>
13#include <linux/sched/signal.h>
14#include <linux/nsproxy.h>
15#include <net/sock.h>
16#include <net/net_namespace.h>
17#include <linux/rtnetlink.h>
18#include <linux/vmalloc.h>
19#include <linux/export.h>
20#include <linux/jiffies.h>
21#include <linux/pm_runtime.h>
22#include <linux/of.h>
23#include <linux/of_net.h>
24#include <linux/cpu.h>
25
26#include "net-sysfs.h"
27
28#ifdef CONFIG_SYSFS
29static const char fmt_hex[] = "%#x\n";
30static const char fmt_dec[] = "%d\n";
31static const char fmt_ulong[] = "%lu\n";
32static const char fmt_u64[] = "%llu\n";
33
34static inline int dev_isalive(const struct net_device *dev)
35{
36 return dev->reg_state <= NETREG_REGISTERED;
37}
38
39/* use same locking rules as GIF* ioctl's */
40static ssize_t netdev_show(const struct device *dev,
41 struct device_attribute *attr, char *buf,
42 ssize_t (*format)(const struct net_device *, char *))
43{
44 struct net_device *ndev = to_net_dev(dev);
45 ssize_t ret = -EINVAL;
46
47 read_lock(&dev_base_lock);
48 if (dev_isalive(ndev))
49 ret = (*format)(ndev, buf);
50 read_unlock(&dev_base_lock);
51
52 return ret;
53}
54
55/* generate a show function for simple field */
56#define NETDEVICE_SHOW(field, format_string) \
57static ssize_t format_##field(const struct net_device *dev, char *buf) \
58{ \
59 return sprintf(buf, format_string, dev->field); \
60} \
61static ssize_t field##_show(struct device *dev, \
62 struct device_attribute *attr, char *buf) \
63{ \
64 return netdev_show(dev, attr, buf, format_##field); \
65} \
66
67#define NETDEVICE_SHOW_RO(field, format_string) \
68NETDEVICE_SHOW(field, format_string); \
69static DEVICE_ATTR_RO(field)
70
71#define NETDEVICE_SHOW_RW(field, format_string) \
72NETDEVICE_SHOW(field, format_string); \
73static DEVICE_ATTR_RW(field)
74
75/* use same locking and permission rules as SIF* ioctl's */
76static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
77 const char *buf, size_t len,
78 int (*set)(struct net_device *, unsigned long))
79{
80 struct net_device *netdev = to_net_dev(dev);
81 struct net *net = dev_net(netdev);
82 unsigned long new;
83 int ret = -EINVAL;
84
85 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
86 return -EPERM;
87
88 ret = kstrtoul(buf, 0, &new);
89 if (ret)
90 goto err;
91
92 if (!rtnl_trylock())
93 return restart_syscall();
94
95 if (dev_isalive(netdev)) {
96 ret = (*set)(netdev, new);
97 if (ret == 0)
98 ret = len;
99 }
100 rtnl_unlock();
101 err:
102 return ret;
103}
104
105NETDEVICE_SHOW_RO(dev_id, fmt_hex);
106NETDEVICE_SHOW_RO(dev_port, fmt_dec);
107NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
108NETDEVICE_SHOW_RO(addr_len, fmt_dec);
109NETDEVICE_SHOW_RO(ifindex, fmt_dec);
110NETDEVICE_SHOW_RO(type, fmt_dec);
111NETDEVICE_SHOW_RO(link_mode, fmt_dec);
112
113static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
114 char *buf)
115{
116 struct net_device *ndev = to_net_dev(dev);
117
118 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
119}
120static DEVICE_ATTR_RO(iflink);
121
122static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
123{
124 return sprintf(buf, fmt_dec, dev->name_assign_type);
125}
126
127static ssize_t name_assign_type_show(struct device *dev,
128 struct device_attribute *attr,
129 char *buf)
130{
131 struct net_device *ndev = to_net_dev(dev);
132 ssize_t ret = -EINVAL;
133
134 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
135 ret = netdev_show(dev, attr, buf, format_name_assign_type);
136
137 return ret;
138}
139static DEVICE_ATTR_RO(name_assign_type);
140
141/* use same locking rules as GIFHWADDR ioctl's */
142static ssize_t address_show(struct device *dev, struct device_attribute *attr,
143 char *buf)
144{
145 struct net_device *ndev = to_net_dev(dev);
146 ssize_t ret = -EINVAL;
147
148 read_lock(&dev_base_lock);
149 if (dev_isalive(ndev))
150 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
151 read_unlock(&dev_base_lock);
152 return ret;
153}
154static DEVICE_ATTR_RO(address);
155
156static ssize_t broadcast_show(struct device *dev,
157 struct device_attribute *attr, char *buf)
158{
159 struct net_device *ndev = to_net_dev(dev);
160
161 if (dev_isalive(ndev))
162 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
163 return -EINVAL;
164}
165static DEVICE_ATTR_RO(broadcast);
166
167static int change_carrier(struct net_device *dev, unsigned long new_carrier)
168{
169 if (!netif_running(dev))
170 return -EINVAL;
171 return dev_change_carrier(dev, (bool)new_carrier);
172}
173
174static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
175 const char *buf, size_t len)
176{
177 return netdev_store(dev, attr, buf, len, change_carrier);
178}
179
180static ssize_t carrier_show(struct device *dev,
181 struct device_attribute *attr, char *buf)
182{
183 struct net_device *netdev = to_net_dev(dev);
184
185 if (netif_running(netdev))
186 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
187
188 return -EINVAL;
189}
190static DEVICE_ATTR_RW(carrier);
191
192static ssize_t speed_show(struct device *dev,
193 struct device_attribute *attr, char *buf)
194{
195 struct net_device *netdev = to_net_dev(dev);
196 int ret = -EINVAL;
197
198 if (!rtnl_trylock())
199 return restart_syscall();
200
201 if (netif_running(netdev)) {
202 struct ethtool_link_ksettings cmd;
203
204 if (!__ethtool_get_link_ksettings(netdev, &cmd))
205 ret = sprintf(buf, fmt_dec, cmd.base.speed);
206 }
207 rtnl_unlock();
208 return ret;
209}
210static DEVICE_ATTR_RO(speed);
211
212static ssize_t duplex_show(struct device *dev,
213 struct device_attribute *attr, char *buf)
214{
215 struct net_device *netdev = to_net_dev(dev);
216 int ret = -EINVAL;
217
218 if (!rtnl_trylock())
219 return restart_syscall();
220
221 if (netif_running(netdev)) {
222 struct ethtool_link_ksettings cmd;
223
224 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
225 const char *duplex;
226
227 switch (cmd.base.duplex) {
228 case DUPLEX_HALF:
229 duplex = "half";
230 break;
231 case DUPLEX_FULL:
232 duplex = "full";
233 break;
234 default:
235 duplex = "unknown";
236 break;
237 }
238 ret = sprintf(buf, "%s\n", duplex);
239 }
240 }
241 rtnl_unlock();
242 return ret;
243}
244static DEVICE_ATTR_RO(duplex);
245
246static ssize_t dormant_show(struct device *dev,
247 struct device_attribute *attr, char *buf)
248{
249 struct net_device *netdev = to_net_dev(dev);
250
251 if (netif_running(netdev))
252 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
253
254 return -EINVAL;
255}
256static DEVICE_ATTR_RO(dormant);
257
258static const char *const operstates[] = {
259 "unknown",
260 "notpresent", /* currently unused */
261 "down",
262 "lowerlayerdown",
263 "testing", /* currently unused */
264 "dormant",
265 "up"
266};
267
268static ssize_t operstate_show(struct device *dev,
269 struct device_attribute *attr, char *buf)
270{
271 const struct net_device *netdev = to_net_dev(dev);
272 unsigned char operstate;
273
274 read_lock(&dev_base_lock);
275 operstate = netdev->operstate;
276 if (!netif_running(netdev))
277 operstate = IF_OPER_DOWN;
278 read_unlock(&dev_base_lock);
279
280 if (operstate >= ARRAY_SIZE(operstates))
281 return -EINVAL; /* should not happen */
282
283 return sprintf(buf, "%s\n", operstates[operstate]);
284}
285static DEVICE_ATTR_RO(operstate);
286
287static ssize_t carrier_changes_show(struct device *dev,
288 struct device_attribute *attr,
289 char *buf)
290{
291 struct net_device *netdev = to_net_dev(dev);
292
293 return sprintf(buf, fmt_dec,
294 atomic_read(&netdev->carrier_up_count) +
295 atomic_read(&netdev->carrier_down_count));
296}
297static DEVICE_ATTR_RO(carrier_changes);
298
299static ssize_t carrier_up_count_show(struct device *dev,
300 struct device_attribute *attr,
301 char *buf)
302{
303 struct net_device *netdev = to_net_dev(dev);
304
305 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
306}
307static DEVICE_ATTR_RO(carrier_up_count);
308
309static ssize_t carrier_down_count_show(struct device *dev,
310 struct device_attribute *attr,
311 char *buf)
312{
313 struct net_device *netdev = to_net_dev(dev);
314
315 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
316}
317static DEVICE_ATTR_RO(carrier_down_count);
318
319/* read-write attributes */
320
321static int change_mtu(struct net_device *dev, unsigned long new_mtu)
322{
323 return dev_set_mtu(dev, (int)new_mtu);
324}
325
326static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
327 const char *buf, size_t len)
328{
329 return netdev_store(dev, attr, buf, len, change_mtu);
330}
331NETDEVICE_SHOW_RW(mtu, fmt_dec);
332
333static int change_flags(struct net_device *dev, unsigned long new_flags)
334{
335 return dev_change_flags(dev, (unsigned int)new_flags, NULL);
336}
337
338static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
339 const char *buf, size_t len)
340{
341 return netdev_store(dev, attr, buf, len, change_flags);
342}
343NETDEVICE_SHOW_RW(flags, fmt_hex);
344
345static ssize_t tx_queue_len_store(struct device *dev,
346 struct device_attribute *attr,
347 const char *buf, size_t len)
348{
349 if (!capable(CAP_NET_ADMIN))
350 return -EPERM;
351
352 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
353}
354NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
355
356static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
357{
358 dev->gro_flush_timeout = val;
359 return 0;
360}
361
362static ssize_t gro_flush_timeout_store(struct device *dev,
363 struct device_attribute *attr,
364 const char *buf, size_t len)
365{
366 if (!capable(CAP_NET_ADMIN))
367 return -EPERM;
368
369 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
370}
371NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
372
373static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
374 const char *buf, size_t len)
375{
376 struct net_device *netdev = to_net_dev(dev);
377 struct net *net = dev_net(netdev);
378 size_t count = len;
379 ssize_t ret = 0;
380
381 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
382 return -EPERM;
383
384 /* ignore trailing newline */
385 if (len > 0 && buf[len - 1] == '\n')
386 --count;
387
388 if (!rtnl_trylock())
389 return restart_syscall();
390
391 if (dev_isalive(netdev)) {
392 ret = dev_set_alias(netdev, buf, count);
393 if (ret < 0)
394 goto err;
395 ret = len;
396 netdev_state_change(netdev);
397 }
398err:
399 rtnl_unlock();
400
401 return ret;
402}
403
404static ssize_t ifalias_show(struct device *dev,
405 struct device_attribute *attr, char *buf)
406{
407 const struct net_device *netdev = to_net_dev(dev);
408 char tmp[IFALIASZ];
409 ssize_t ret = 0;
410
411 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
412 if (ret > 0)
413 ret = sprintf(buf, "%s\n", tmp);
414 return ret;
415}
416static DEVICE_ATTR_RW(ifalias);
417
418static int change_group(struct net_device *dev, unsigned long new_group)
419{
420 dev_set_group(dev, (int)new_group);
421 return 0;
422}
423
424static ssize_t group_store(struct device *dev, struct device_attribute *attr,
425 const char *buf, size_t len)
426{
427 return netdev_store(dev, attr, buf, len, change_group);
428}
429NETDEVICE_SHOW(group, fmt_dec);
430static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
431
432static int change_proto_down(struct net_device *dev, unsigned long proto_down)
433{
434 return dev_change_proto_down(dev, (bool)proto_down);
435}
436
437static ssize_t proto_down_store(struct device *dev,
438 struct device_attribute *attr,
439 const char *buf, size_t len)
440{
441 return netdev_store(dev, attr, buf, len, change_proto_down);
442}
443NETDEVICE_SHOW_RW(proto_down, fmt_dec);
444
445static ssize_t phys_port_id_show(struct device *dev,
446 struct device_attribute *attr, char *buf)
447{
448 struct net_device *netdev = to_net_dev(dev);
449 ssize_t ret = -EINVAL;
450
451 if (!rtnl_trylock())
452 return restart_syscall();
453
454 if (dev_isalive(netdev)) {
455 struct netdev_phys_item_id ppid;
456
457 ret = dev_get_phys_port_id(netdev, &ppid);
458 if (!ret)
459 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
460 }
461 rtnl_unlock();
462
463 return ret;
464}
465static DEVICE_ATTR_RO(phys_port_id);
466
467static ssize_t phys_port_name_show(struct device *dev,
468 struct device_attribute *attr, char *buf)
469{
470 struct net_device *netdev = to_net_dev(dev);
471 ssize_t ret = -EINVAL;
472
473 if (!rtnl_trylock())
474 return restart_syscall();
475
476 if (dev_isalive(netdev)) {
477 char name[IFNAMSIZ];
478
479 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
480 if (!ret)
481 ret = sprintf(buf, "%s\n", name);
482 }
483 rtnl_unlock();
484
485 return ret;
486}
487static DEVICE_ATTR_RO(phys_port_name);
488
489static ssize_t phys_switch_id_show(struct device *dev,
490 struct device_attribute *attr, char *buf)
491{
492 struct net_device *netdev = to_net_dev(dev);
493 ssize_t ret = -EINVAL;
494
495 if (!rtnl_trylock())
496 return restart_syscall();
497
498 if (dev_isalive(netdev)) {
499 struct netdev_phys_item_id ppid = { };
500
501 ret = dev_get_port_parent_id(netdev, &ppid, false);
502 if (!ret)
503 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
504 }
505 rtnl_unlock();
506
507 return ret;
508}
509static DEVICE_ATTR_RO(phys_switch_id);
510
511static struct attribute *net_class_attrs[] __ro_after_init = {
512 &dev_attr_netdev_group.attr,
513 &dev_attr_type.attr,
514 &dev_attr_dev_id.attr,
515 &dev_attr_dev_port.attr,
516 &dev_attr_iflink.attr,
517 &dev_attr_ifindex.attr,
518 &dev_attr_name_assign_type.attr,
519 &dev_attr_addr_assign_type.attr,
520 &dev_attr_addr_len.attr,
521 &dev_attr_link_mode.attr,
522 &dev_attr_address.attr,
523 &dev_attr_broadcast.attr,
524 &dev_attr_speed.attr,
525 &dev_attr_duplex.attr,
526 &dev_attr_dormant.attr,
527 &dev_attr_operstate.attr,
528 &dev_attr_carrier_changes.attr,
529 &dev_attr_ifalias.attr,
530 &dev_attr_carrier.attr,
531 &dev_attr_mtu.attr,
532 &dev_attr_flags.attr,
533 &dev_attr_tx_queue_len.attr,
534 &dev_attr_gro_flush_timeout.attr,
535 &dev_attr_phys_port_id.attr,
536 &dev_attr_phys_port_name.attr,
537 &dev_attr_phys_switch_id.attr,
538 &dev_attr_proto_down.attr,
539 &dev_attr_carrier_up_count.attr,
540 &dev_attr_carrier_down_count.attr,
541 NULL,
542};
543ATTRIBUTE_GROUPS(net_class);
544
545/* Show a given an attribute in the statistics group */
546static ssize_t netstat_show(const struct device *d,
547 struct device_attribute *attr, char *buf,
548 unsigned long offset)
549{
550 struct net_device *dev = to_net_dev(d);
551 ssize_t ret = -EINVAL;
552
553 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
554 offset % sizeof(u64) != 0);
555
556 read_lock(&dev_base_lock);
557 if (dev_isalive(dev)) {
558 struct rtnl_link_stats64 temp;
559 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
560
561 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
562 }
563 read_unlock(&dev_base_lock);
564 return ret;
565}
566
567/* generate a read-only statistics attribute */
568#define NETSTAT_ENTRY(name) \
569static ssize_t name##_show(struct device *d, \
570 struct device_attribute *attr, char *buf) \
571{ \
572 return netstat_show(d, attr, buf, \
573 offsetof(struct rtnl_link_stats64, name)); \
574} \
575static DEVICE_ATTR_RO(name)
576
577NETSTAT_ENTRY(rx_packets);
578NETSTAT_ENTRY(tx_packets);
579NETSTAT_ENTRY(rx_bytes);
580NETSTAT_ENTRY(tx_bytes);
581NETSTAT_ENTRY(rx_errors);
582NETSTAT_ENTRY(tx_errors);
583NETSTAT_ENTRY(rx_dropped);
584NETSTAT_ENTRY(tx_dropped);
585NETSTAT_ENTRY(multicast);
586NETSTAT_ENTRY(collisions);
587NETSTAT_ENTRY(rx_length_errors);
588NETSTAT_ENTRY(rx_over_errors);
589NETSTAT_ENTRY(rx_crc_errors);
590NETSTAT_ENTRY(rx_frame_errors);
591NETSTAT_ENTRY(rx_fifo_errors);
592NETSTAT_ENTRY(rx_missed_errors);
593NETSTAT_ENTRY(tx_aborted_errors);
594NETSTAT_ENTRY(tx_carrier_errors);
595NETSTAT_ENTRY(tx_fifo_errors);
596NETSTAT_ENTRY(tx_heartbeat_errors);
597NETSTAT_ENTRY(tx_window_errors);
598NETSTAT_ENTRY(rx_compressed);
599NETSTAT_ENTRY(tx_compressed);
600NETSTAT_ENTRY(rx_nohandler);
601
602static struct attribute *netstat_attrs[] __ro_after_init = {
603 &dev_attr_rx_packets.attr,
604 &dev_attr_tx_packets.attr,
605 &dev_attr_rx_bytes.attr,
606 &dev_attr_tx_bytes.attr,
607 &dev_attr_rx_errors.attr,
608 &dev_attr_tx_errors.attr,
609 &dev_attr_rx_dropped.attr,
610 &dev_attr_tx_dropped.attr,
611 &dev_attr_multicast.attr,
612 &dev_attr_collisions.attr,
613 &dev_attr_rx_length_errors.attr,
614 &dev_attr_rx_over_errors.attr,
615 &dev_attr_rx_crc_errors.attr,
616 &dev_attr_rx_frame_errors.attr,
617 &dev_attr_rx_fifo_errors.attr,
618 &dev_attr_rx_missed_errors.attr,
619 &dev_attr_tx_aborted_errors.attr,
620 &dev_attr_tx_carrier_errors.attr,
621 &dev_attr_tx_fifo_errors.attr,
622 &dev_attr_tx_heartbeat_errors.attr,
623 &dev_attr_tx_window_errors.attr,
624 &dev_attr_rx_compressed.attr,
625 &dev_attr_tx_compressed.attr,
626 &dev_attr_rx_nohandler.attr,
627 NULL
628};
629
630static const struct attribute_group netstat_group = {
631 .name = "statistics",
632 .attrs = netstat_attrs,
633};
634
635#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
636static struct attribute *wireless_attrs[] = {
637 NULL
638};
639
640static const struct attribute_group wireless_group = {
641 .name = "wireless",
642 .attrs = wireless_attrs,
643};
644#endif
645
646#else /* CONFIG_SYSFS */
647#define net_class_groups NULL
648#endif /* CONFIG_SYSFS */
649
650#ifdef CONFIG_SYSFS
651#define to_rx_queue_attr(_attr) \
652 container_of(_attr, struct rx_queue_attribute, attr)
653
654#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
655
656static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
657 char *buf)
658{
659 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
660 struct netdev_rx_queue *queue = to_rx_queue(kobj);
661
662 if (!attribute->show)
663 return -EIO;
664
665 return attribute->show(queue, buf);
666}
667
668static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
669 const char *buf, size_t count)
670{
671 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
672 struct netdev_rx_queue *queue = to_rx_queue(kobj);
673
674 if (!attribute->store)
675 return -EIO;
676
677 return attribute->store(queue, buf, count);
678}
679
680static const struct sysfs_ops rx_queue_sysfs_ops = {
681 .show = rx_queue_attr_show,
682 .store = rx_queue_attr_store,
683};
684
685#ifdef CONFIG_RPS
686static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
687{
688 struct rps_map *map;
689 cpumask_var_t mask;
690 int i, len;
691
692 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
693 return -ENOMEM;
694
695 rcu_read_lock();
696 map = rcu_dereference(queue->rps_map);
697 if (map)
698 for (i = 0; i < map->len; i++)
699 cpumask_set_cpu(map->cpus[i], mask);
700
701 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
702 rcu_read_unlock();
703 free_cpumask_var(mask);
704
705 return len < PAGE_SIZE ? len : -EINVAL;
706}
707
708static ssize_t store_rps_map(struct netdev_rx_queue *queue,
709 const char *buf, size_t len)
710{
711 struct rps_map *old_map, *map;
712 cpumask_var_t mask;
713 int err, cpu, i;
714 static DEFINE_MUTEX(rps_map_mutex);
715
716 if (!capable(CAP_NET_ADMIN))
717 return -EPERM;
718
719 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
720 return -ENOMEM;
721
722 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
723 if (err) {
724 free_cpumask_var(mask);
725 return err;
726 }
727
728 map = kzalloc(max_t(unsigned int,
729 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
730 GFP_KERNEL);
731 if (!map) {
732 free_cpumask_var(mask);
733 return -ENOMEM;
734 }
735
736 i = 0;
737 for_each_cpu_and(cpu, mask, cpu_online_mask)
738 map->cpus[i++] = cpu;
739
740 if (i) {
741 map->len = i;
742 } else {
743 kfree(map);
744 map = NULL;
745 }
746
747 mutex_lock(&rps_map_mutex);
748 old_map = rcu_dereference_protected(queue->rps_map,
749 mutex_is_locked(&rps_map_mutex));
750 rcu_assign_pointer(queue->rps_map, map);
751
752 if (map)
753 static_branch_inc(&rps_needed);
754 if (old_map)
755 static_branch_dec(&rps_needed);
756
757 mutex_unlock(&rps_map_mutex);
758
759 if (old_map)
760 kfree_rcu(old_map, rcu);
761
762 free_cpumask_var(mask);
763 return len;
764}
765
766static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
767 char *buf)
768{
769 struct rps_dev_flow_table *flow_table;
770 unsigned long val = 0;
771
772 rcu_read_lock();
773 flow_table = rcu_dereference(queue->rps_flow_table);
774 if (flow_table)
775 val = (unsigned long)flow_table->mask + 1;
776 rcu_read_unlock();
777
778 return sprintf(buf, "%lu\n", val);
779}
780
781static void rps_dev_flow_table_release(struct rcu_head *rcu)
782{
783 struct rps_dev_flow_table *table = container_of(rcu,
784 struct rps_dev_flow_table, rcu);
785 vfree(table);
786}
787
788static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
789 const char *buf, size_t len)
790{
791 unsigned long mask, count;
792 struct rps_dev_flow_table *table, *old_table;
793 static DEFINE_SPINLOCK(rps_dev_flow_lock);
794 int rc;
795
796 if (!capable(CAP_NET_ADMIN))
797 return -EPERM;
798
799 rc = kstrtoul(buf, 0, &count);
800 if (rc < 0)
801 return rc;
802
803 if (count) {
804 mask = count - 1;
805 /* mask = roundup_pow_of_two(count) - 1;
806 * without overflows...
807 */
808 while ((mask | (mask >> 1)) != mask)
809 mask |= (mask >> 1);
810 /* On 64 bit arches, must check mask fits in table->mask (u32),
811 * and on 32bit arches, must check
812 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
813 */
814#if BITS_PER_LONG > 32
815 if (mask > (unsigned long)(u32)mask)
816 return -EINVAL;
817#else
818 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
819 / sizeof(struct rps_dev_flow)) {
820 /* Enforce a limit to prevent overflow */
821 return -EINVAL;
822 }
823#endif
824 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
825 if (!table)
826 return -ENOMEM;
827
828 table->mask = mask;
829 for (count = 0; count <= mask; count++)
830 table->flows[count].cpu = RPS_NO_CPU;
831 } else {
832 table = NULL;
833 }
834
835 spin_lock(&rps_dev_flow_lock);
836 old_table = rcu_dereference_protected(queue->rps_flow_table,
837 lockdep_is_held(&rps_dev_flow_lock));
838 rcu_assign_pointer(queue->rps_flow_table, table);
839 spin_unlock(&rps_dev_flow_lock);
840
841 if (old_table)
842 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
843
844 return len;
845}
846
847static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
848 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
849
850static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
851 = __ATTR(rps_flow_cnt, 0644,
852 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
853#endif /* CONFIG_RPS */
854
855static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
856#ifdef CONFIG_RPS
857 &rps_cpus_attribute.attr,
858 &rps_dev_flow_table_cnt_attribute.attr,
859#endif
860 NULL
861};
862ATTRIBUTE_GROUPS(rx_queue_default);
863
864static void rx_queue_release(struct kobject *kobj)
865{
866 struct netdev_rx_queue *queue = to_rx_queue(kobj);
867#ifdef CONFIG_RPS
868 struct rps_map *map;
869 struct rps_dev_flow_table *flow_table;
870
871 map = rcu_dereference_protected(queue->rps_map, 1);
872 if (map) {
873 RCU_INIT_POINTER(queue->rps_map, NULL);
874 kfree_rcu(map, rcu);
875 }
876
877 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
878 if (flow_table) {
879 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
880 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
881 }
882#endif
883
884 memset(kobj, 0, sizeof(*kobj));
885 dev_put(queue->dev);
886}
887
888static const void *rx_queue_namespace(struct kobject *kobj)
889{
890 struct netdev_rx_queue *queue = to_rx_queue(kobj);
891 struct device *dev = &queue->dev->dev;
892 const void *ns = NULL;
893
894 if (dev->class && dev->class->ns_type)
895 ns = dev->class->namespace(dev);
896
897 return ns;
898}
899
900static void rx_queue_get_ownership(struct kobject *kobj,
901 kuid_t *uid, kgid_t *gid)
902{
903 const struct net *net = rx_queue_namespace(kobj);
904
905 net_ns_get_ownership(net, uid, gid);
906}
907
908static struct kobj_type rx_queue_ktype __ro_after_init = {
909 .sysfs_ops = &rx_queue_sysfs_ops,
910 .release = rx_queue_release,
911 .default_groups = rx_queue_default_groups,
912 .namespace = rx_queue_namespace,
913 .get_ownership = rx_queue_get_ownership,
914};
915
916static int rx_queue_add_kobject(struct net_device *dev, int index)
917{
918 struct netdev_rx_queue *queue = dev->_rx + index;
919 struct kobject *kobj = &queue->kobj;
920 int error = 0;
921
922 kobj->kset = dev->queues_kset;
923 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
924 "rx-%u", index);
925 if (error)
926 goto err;
927
928 dev_hold(queue->dev);
929
930 if (dev->sysfs_rx_queue_group) {
931 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
932 if (error)
933 goto err;
934 }
935
936 kobject_uevent(kobj, KOBJ_ADD);
937
938 return error;
939
940err:
941 kobject_put(kobj);
942 return error;
943}
944#endif /* CONFIG_SYSFS */
945
946int
947net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
948{
949#ifdef CONFIG_SYSFS
950 int i;
951 int error = 0;
952
953#ifndef CONFIG_RPS
954 if (!dev->sysfs_rx_queue_group)
955 return 0;
956#endif
957 for (i = old_num; i < new_num; i++) {
958 error = rx_queue_add_kobject(dev, i);
959 if (error) {
960 new_num = old_num;
961 break;
962 }
963 }
964
965 while (--i >= new_num) {
966 struct kobject *kobj = &dev->_rx[i].kobj;
967
968 if (!refcount_read(&dev_net(dev)->count))
969 kobj->uevent_suppress = 1;
970 if (dev->sysfs_rx_queue_group)
971 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
972 kobject_put(kobj);
973 }
974
975 return error;
976#else
977 return 0;
978#endif
979}
980
981#ifdef CONFIG_SYSFS
982/*
983 * netdev_queue sysfs structures and functions.
984 */
985struct netdev_queue_attribute {
986 struct attribute attr;
987 ssize_t (*show)(struct netdev_queue *queue, char *buf);
988 ssize_t (*store)(struct netdev_queue *queue,
989 const char *buf, size_t len);
990};
991#define to_netdev_queue_attr(_attr) \
992 container_of(_attr, struct netdev_queue_attribute, attr)
993
994#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
995
996static ssize_t netdev_queue_attr_show(struct kobject *kobj,
997 struct attribute *attr, char *buf)
998{
999 const struct netdev_queue_attribute *attribute
1000 = to_netdev_queue_attr(attr);
1001 struct netdev_queue *queue = to_netdev_queue(kobj);
1002
1003 if (!attribute->show)
1004 return -EIO;
1005
1006 return attribute->show(queue, buf);
1007}
1008
1009static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1010 struct attribute *attr,
1011 const char *buf, size_t count)
1012{
1013 const struct netdev_queue_attribute *attribute
1014 = to_netdev_queue_attr(attr);
1015 struct netdev_queue *queue = to_netdev_queue(kobj);
1016
1017 if (!attribute->store)
1018 return -EIO;
1019
1020 return attribute->store(queue, buf, count);
1021}
1022
1023static const struct sysfs_ops netdev_queue_sysfs_ops = {
1024 .show = netdev_queue_attr_show,
1025 .store = netdev_queue_attr_store,
1026};
1027
1028static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1029{
1030 unsigned long trans_timeout;
1031
1032 spin_lock_irq(&queue->_xmit_lock);
1033 trans_timeout = queue->trans_timeout;
1034 spin_unlock_irq(&queue->_xmit_lock);
1035
1036 return sprintf(buf, "%lu", trans_timeout);
1037}
1038
1039static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1040{
1041 struct net_device *dev = queue->dev;
1042 unsigned int i;
1043
1044 i = queue - dev->_tx;
1045 BUG_ON(i >= dev->num_tx_queues);
1046
1047 return i;
1048}
1049
1050static ssize_t traffic_class_show(struct netdev_queue *queue,
1051 char *buf)
1052{
1053 struct net_device *dev = queue->dev;
1054 int index;
1055 int tc;
1056
1057 if (!netif_is_multiqueue(dev))
1058 return -ENOENT;
1059
1060 index = get_netdev_queue_index(queue);
1061
1062 /* If queue belongs to subordinate dev use its TC mapping */
1063 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1064
1065 tc = netdev_txq_to_tc(dev, index);
1066 if (tc < 0)
1067 return -EINVAL;
1068
1069 /* We can report the traffic class one of two ways:
1070 * Subordinate device traffic classes are reported with the traffic
1071 * class first, and then the subordinate class so for example TC0 on
1072 * subordinate device 2 will be reported as "0-2". If the queue
1073 * belongs to the root device it will be reported with just the
1074 * traffic class, so just "0" for TC 0 for example.
1075 */
1076 return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1077 sprintf(buf, "%u\n", tc);
1078}
1079
1080#ifdef CONFIG_XPS
1081static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1082 char *buf)
1083{
1084 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1085}
1086
1087static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1088 const char *buf, size_t len)
1089{
1090 struct net_device *dev = queue->dev;
1091 int err, index = get_netdev_queue_index(queue);
1092 u32 rate = 0;
1093
1094 if (!capable(CAP_NET_ADMIN))
1095 return -EPERM;
1096
1097 err = kstrtou32(buf, 10, &rate);
1098 if (err < 0)
1099 return err;
1100
1101 if (!rtnl_trylock())
1102 return restart_syscall();
1103
1104 err = -EOPNOTSUPP;
1105 if (dev->netdev_ops->ndo_set_tx_maxrate)
1106 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1107
1108 rtnl_unlock();
1109 if (!err) {
1110 queue->tx_maxrate = rate;
1111 return len;
1112 }
1113 return err;
1114}
1115
1116static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1117 = __ATTR_RW(tx_maxrate);
1118#endif
1119
1120static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1121 = __ATTR_RO(tx_timeout);
1122
1123static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1124 = __ATTR_RO(traffic_class);
1125
1126#ifdef CONFIG_BQL
1127/*
1128 * Byte queue limits sysfs structures and functions.
1129 */
1130static ssize_t bql_show(char *buf, unsigned int value)
1131{
1132 return sprintf(buf, "%u\n", value);
1133}
1134
1135static ssize_t bql_set(const char *buf, const size_t count,
1136 unsigned int *pvalue)
1137{
1138 unsigned int value;
1139 int err;
1140
1141 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1142 value = DQL_MAX_LIMIT;
1143 } else {
1144 err = kstrtouint(buf, 10, &value);
1145 if (err < 0)
1146 return err;
1147 if (value > DQL_MAX_LIMIT)
1148 return -EINVAL;
1149 }
1150
1151 *pvalue = value;
1152
1153 return count;
1154}
1155
1156static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1157 char *buf)
1158{
1159 struct dql *dql = &queue->dql;
1160
1161 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1162}
1163
1164static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1165 const char *buf, size_t len)
1166{
1167 struct dql *dql = &queue->dql;
1168 unsigned int value;
1169 int err;
1170
1171 err = kstrtouint(buf, 10, &value);
1172 if (err < 0)
1173 return err;
1174
1175 dql->slack_hold_time = msecs_to_jiffies(value);
1176
1177 return len;
1178}
1179
1180static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1181 = __ATTR(hold_time, 0644,
1182 bql_show_hold_time, bql_set_hold_time);
1183
1184static ssize_t bql_show_inflight(struct netdev_queue *queue,
1185 char *buf)
1186{
1187 struct dql *dql = &queue->dql;
1188
1189 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1190}
1191
1192static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1193 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1194
1195#define BQL_ATTR(NAME, FIELD) \
1196static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1197 char *buf) \
1198{ \
1199 return bql_show(buf, queue->dql.FIELD); \
1200} \
1201 \
1202static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1203 const char *buf, size_t len) \
1204{ \
1205 return bql_set(buf, len, &queue->dql.FIELD); \
1206} \
1207 \
1208static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1209 = __ATTR(NAME, 0644, \
1210 bql_show_ ## NAME, bql_set_ ## NAME)
1211
1212BQL_ATTR(limit, limit);
1213BQL_ATTR(limit_max, max_limit);
1214BQL_ATTR(limit_min, min_limit);
1215
1216static struct attribute *dql_attrs[] __ro_after_init = {
1217 &bql_limit_attribute.attr,
1218 &bql_limit_max_attribute.attr,
1219 &bql_limit_min_attribute.attr,
1220 &bql_hold_time_attribute.attr,
1221 &bql_inflight_attribute.attr,
1222 NULL
1223};
1224
1225static const struct attribute_group dql_group = {
1226 .name = "byte_queue_limits",
1227 .attrs = dql_attrs,
1228};
1229#endif /* CONFIG_BQL */
1230
1231#ifdef CONFIG_XPS
1232static ssize_t xps_cpus_show(struct netdev_queue *queue,
1233 char *buf)
1234{
1235 struct net_device *dev = queue->dev;
1236 int cpu, len, num_tc = 1, tc = 0;
1237 struct xps_dev_maps *dev_maps;
1238 cpumask_var_t mask;
1239 unsigned long index;
1240
1241 if (!netif_is_multiqueue(dev))
1242 return -ENOENT;
1243
1244 index = get_netdev_queue_index(queue);
1245
1246 if (dev->num_tc) {
1247 /* Do not allow XPS on subordinate device directly */
1248 num_tc = dev->num_tc;
1249 if (num_tc < 0)
1250 return -EINVAL;
1251
1252 /* If queue belongs to subordinate dev use its map */
1253 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1254
1255 tc = netdev_txq_to_tc(dev, index);
1256 if (tc < 0)
1257 return -EINVAL;
1258 }
1259
1260 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1261 return -ENOMEM;
1262
1263 rcu_read_lock();
1264 dev_maps = rcu_dereference(dev->xps_cpus_map);
1265 if (dev_maps) {
1266 for_each_possible_cpu(cpu) {
1267 int i, tci = cpu * num_tc + tc;
1268 struct xps_map *map;
1269
1270 map = rcu_dereference(dev_maps->attr_map[tci]);
1271 if (!map)
1272 continue;
1273
1274 for (i = map->len; i--;) {
1275 if (map->queues[i] == index) {
1276 cpumask_set_cpu(cpu, mask);
1277 break;
1278 }
1279 }
1280 }
1281 }
1282 rcu_read_unlock();
1283
1284 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1285 free_cpumask_var(mask);
1286 return len < PAGE_SIZE ? len : -EINVAL;
1287}
1288
1289static ssize_t xps_cpus_store(struct netdev_queue *queue,
1290 const char *buf, size_t len)
1291{
1292 struct net_device *dev = queue->dev;
1293 unsigned long index;
1294 cpumask_var_t mask;
1295 int err;
1296
1297 if (!netif_is_multiqueue(dev))
1298 return -ENOENT;
1299
1300 if (!capable(CAP_NET_ADMIN))
1301 return -EPERM;
1302
1303 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1304 return -ENOMEM;
1305
1306 index = get_netdev_queue_index(queue);
1307
1308 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1309 if (err) {
1310 free_cpumask_var(mask);
1311 return err;
1312 }
1313
1314 err = netif_set_xps_queue(dev, mask, index);
1315
1316 free_cpumask_var(mask);
1317
1318 return err ? : len;
1319}
1320
1321static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1322 = __ATTR_RW(xps_cpus);
1323
1324static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1325{
1326 struct net_device *dev = queue->dev;
1327 struct xps_dev_maps *dev_maps;
1328 unsigned long *mask, index;
1329 int j, len, num_tc = 1, tc = 0;
1330
1331 index = get_netdev_queue_index(queue);
1332
1333 if (dev->num_tc) {
1334 num_tc = dev->num_tc;
1335 tc = netdev_txq_to_tc(dev, index);
1336 if (tc < 0)
1337 return -EINVAL;
1338 }
1339 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1340 if (!mask)
1341 return -ENOMEM;
1342
1343 rcu_read_lock();
1344 dev_maps = rcu_dereference(dev->xps_rxqs_map);
1345 if (!dev_maps)
1346 goto out_no_maps;
1347
1348 for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1349 j < dev->num_rx_queues;) {
1350 int i, tci = j * num_tc + tc;
1351 struct xps_map *map;
1352
1353 map = rcu_dereference(dev_maps->attr_map[tci]);
1354 if (!map)
1355 continue;
1356
1357 for (i = map->len; i--;) {
1358 if (map->queues[i] == index) {
1359 set_bit(j, mask);
1360 break;
1361 }
1362 }
1363 }
1364out_no_maps:
1365 rcu_read_unlock();
1366
1367 len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1368 bitmap_free(mask);
1369
1370 return len < PAGE_SIZE ? len : -EINVAL;
1371}
1372
1373static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1374 size_t len)
1375{
1376 struct net_device *dev = queue->dev;
1377 struct net *net = dev_net(dev);
1378 unsigned long *mask, index;
1379 int err;
1380
1381 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1382 return -EPERM;
1383
1384 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1385 if (!mask)
1386 return -ENOMEM;
1387
1388 index = get_netdev_queue_index(queue);
1389
1390 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1391 if (err) {
1392 bitmap_free(mask);
1393 return err;
1394 }
1395
1396 cpus_read_lock();
1397 err = __netif_set_xps_queue(dev, mask, index, true);
1398 cpus_read_unlock();
1399
1400 bitmap_free(mask);
1401 return err ? : len;
1402}
1403
1404static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1405 = __ATTR_RW(xps_rxqs);
1406#endif /* CONFIG_XPS */
1407
1408static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1409 &queue_trans_timeout.attr,
1410 &queue_traffic_class.attr,
1411#ifdef CONFIG_XPS
1412 &xps_cpus_attribute.attr,
1413 &xps_rxqs_attribute.attr,
1414 &queue_tx_maxrate.attr,
1415#endif
1416 NULL
1417};
1418ATTRIBUTE_GROUPS(netdev_queue_default);
1419
1420static void netdev_queue_release(struct kobject *kobj)
1421{
1422 struct netdev_queue *queue = to_netdev_queue(kobj);
1423
1424 memset(kobj, 0, sizeof(*kobj));
1425 dev_put(queue->dev);
1426}
1427
1428static const void *netdev_queue_namespace(struct kobject *kobj)
1429{
1430 struct netdev_queue *queue = to_netdev_queue(kobj);
1431 struct device *dev = &queue->dev->dev;
1432 const void *ns = NULL;
1433
1434 if (dev->class && dev->class->ns_type)
1435 ns = dev->class->namespace(dev);
1436
1437 return ns;
1438}
1439
1440static void netdev_queue_get_ownership(struct kobject *kobj,
1441 kuid_t *uid, kgid_t *gid)
1442{
1443 const struct net *net = netdev_queue_namespace(kobj);
1444
1445 net_ns_get_ownership(net, uid, gid);
1446}
1447
1448static struct kobj_type netdev_queue_ktype __ro_after_init = {
1449 .sysfs_ops = &netdev_queue_sysfs_ops,
1450 .release = netdev_queue_release,
1451 .default_groups = netdev_queue_default_groups,
1452 .namespace = netdev_queue_namespace,
1453 .get_ownership = netdev_queue_get_ownership,
1454};
1455
1456static int netdev_queue_add_kobject(struct net_device *dev, int index)
1457{
1458 struct netdev_queue *queue = dev->_tx + index;
1459 struct kobject *kobj = &queue->kobj;
1460 int error = 0;
1461
1462 kobj->kset = dev->queues_kset;
1463 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1464 "tx-%u", index);
1465 if (error)
1466 goto err;
1467
1468 dev_hold(queue->dev);
1469
1470#ifdef CONFIG_BQL
1471 error = sysfs_create_group(kobj, &dql_group);
1472 if (error)
1473 goto err;
1474#endif
1475
1476 kobject_uevent(kobj, KOBJ_ADD);
1477 return 0;
1478
1479err:
1480 kobject_put(kobj);
1481 return error;
1482}
1483#endif /* CONFIG_SYSFS */
1484
1485int
1486netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1487{
1488#ifdef CONFIG_SYSFS
1489 int i;
1490 int error = 0;
1491
1492 for (i = old_num; i < new_num; i++) {
1493 error = netdev_queue_add_kobject(dev, i);
1494 if (error) {
1495 new_num = old_num;
1496 break;
1497 }
1498 }
1499
1500 while (--i >= new_num) {
1501 struct netdev_queue *queue = dev->_tx + i;
1502
1503 if (!refcount_read(&dev_net(dev)->count))
1504 queue->kobj.uevent_suppress = 1;
1505#ifdef CONFIG_BQL
1506 sysfs_remove_group(&queue->kobj, &dql_group);
1507#endif
1508 kobject_put(&queue->kobj);
1509 }
1510
1511 return error;
1512#else
1513 return 0;
1514#endif /* CONFIG_SYSFS */
1515}
1516
1517static int register_queue_kobjects(struct net_device *dev)
1518{
1519 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1520
1521#ifdef CONFIG_SYSFS
1522 dev->queues_kset = kset_create_and_add("queues",
1523 NULL, &dev->dev.kobj);
1524 if (!dev->queues_kset)
1525 return -ENOMEM;
1526 real_rx = dev->real_num_rx_queues;
1527#endif
1528 real_tx = dev->real_num_tx_queues;
1529
1530 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1531 if (error)
1532 goto error;
1533 rxq = real_rx;
1534
1535 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1536 if (error)
1537 goto error;
1538 txq = real_tx;
1539
1540 return 0;
1541
1542error:
1543 netdev_queue_update_kobjects(dev, txq, 0);
1544 net_rx_queue_update_kobjects(dev, rxq, 0);
1545#ifdef CONFIG_SYSFS
1546 kset_unregister(dev->queues_kset);
1547#endif
1548 return error;
1549}
1550
1551static void remove_queue_kobjects(struct net_device *dev)
1552{
1553 int real_rx = 0, real_tx = 0;
1554
1555#ifdef CONFIG_SYSFS
1556 real_rx = dev->real_num_rx_queues;
1557#endif
1558 real_tx = dev->real_num_tx_queues;
1559
1560 net_rx_queue_update_kobjects(dev, real_rx, 0);
1561 netdev_queue_update_kobjects(dev, real_tx, 0);
1562#ifdef CONFIG_SYSFS
1563 kset_unregister(dev->queues_kset);
1564#endif
1565}
1566
1567static bool net_current_may_mount(void)
1568{
1569 struct net *net = current->nsproxy->net_ns;
1570
1571 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1572}
1573
1574static void *net_grab_current_ns(void)
1575{
1576 struct net *ns = current->nsproxy->net_ns;
1577#ifdef CONFIG_NET_NS
1578 if (ns)
1579 refcount_inc(&ns->passive);
1580#endif
1581 return ns;
1582}
1583
1584static const void *net_initial_ns(void)
1585{
1586 return &init_net;
1587}
1588
1589static const void *net_netlink_ns(struct sock *sk)
1590{
1591 return sock_net(sk);
1592}
1593
1594const struct kobj_ns_type_operations net_ns_type_operations = {
1595 .type = KOBJ_NS_TYPE_NET,
1596 .current_may_mount = net_current_may_mount,
1597 .grab_current_ns = net_grab_current_ns,
1598 .netlink_ns = net_netlink_ns,
1599 .initial_ns = net_initial_ns,
1600 .drop_ns = net_drop_ns,
1601};
1602EXPORT_SYMBOL_GPL(net_ns_type_operations);
1603
1604static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1605{
1606 struct net_device *dev = to_net_dev(d);
1607 int retval;
1608
1609 /* pass interface to uevent. */
1610 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1611 if (retval)
1612 goto exit;
1613
1614 /* pass ifindex to uevent.
1615 * ifindex is useful as it won't change (interface name may change)
1616 * and is what RtNetlink uses natively.
1617 */
1618 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1619
1620exit:
1621 return retval;
1622}
1623
1624/*
1625 * netdev_release -- destroy and free a dead device.
1626 * Called when last reference to device kobject is gone.
1627 */
1628static void netdev_release(struct device *d)
1629{
1630 struct net_device *dev = to_net_dev(d);
1631
1632 BUG_ON(dev->reg_state != NETREG_RELEASED);
1633
1634 /* no need to wait for rcu grace period:
1635 * device is dead and about to be freed.
1636 */
1637 kfree(rcu_access_pointer(dev->ifalias));
1638 netdev_freemem(dev);
1639}
1640
1641static const void *net_namespace(struct device *d)
1642{
1643 struct net_device *dev = to_net_dev(d);
1644
1645 return dev_net(dev);
1646}
1647
1648static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1649{
1650 struct net_device *dev = to_net_dev(d);
1651 const struct net *net = dev_net(dev);
1652
1653 net_ns_get_ownership(net, uid, gid);
1654}
1655
1656static struct class net_class __ro_after_init = {
1657 .name = "net",
1658 .dev_release = netdev_release,
1659 .dev_groups = net_class_groups,
1660 .dev_uevent = netdev_uevent,
1661 .ns_type = &net_ns_type_operations,
1662 .namespace = net_namespace,
1663 .get_ownership = net_get_ownership,
1664};
1665
1666#ifdef CONFIG_OF_NET
1667static int of_dev_node_match(struct device *dev, const void *data)
1668{
1669 int ret = 0;
1670
1671 if (dev->parent)
1672 ret = dev->parent->of_node == data;
1673
1674 return ret == 0 ? dev->of_node == data : ret;
1675}
1676
1677/*
1678 * of_find_net_device_by_node - lookup the net device for the device node
1679 * @np: OF device node
1680 *
1681 * Looks up the net_device structure corresponding with the device node.
1682 * If successful, returns a pointer to the net_device with the embedded
1683 * struct device refcount incremented by one, or NULL on failure. The
1684 * refcount must be dropped when done with the net_device.
1685 */
1686struct net_device *of_find_net_device_by_node(struct device_node *np)
1687{
1688 struct device *dev;
1689
1690 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1691 if (!dev)
1692 return NULL;
1693
1694 return to_net_dev(dev);
1695}
1696EXPORT_SYMBOL(of_find_net_device_by_node);
1697#endif
1698
1699/* Delete sysfs entries but hold kobject reference until after all
1700 * netdev references are gone.
1701 */
1702void netdev_unregister_kobject(struct net_device *ndev)
1703{
1704 struct device *dev = &ndev->dev;
1705
1706 if (!refcount_read(&dev_net(ndev)->count))
1707 dev_set_uevent_suppress(dev, 1);
1708
1709 kobject_get(&dev->kobj);
1710
1711 remove_queue_kobjects(ndev);
1712
1713 pm_runtime_set_memalloc_noio(dev, false);
1714
1715 device_del(dev);
1716}
1717
1718/* Create sysfs entries for network device. */
1719int netdev_register_kobject(struct net_device *ndev)
1720{
1721 struct device *dev = &ndev->dev;
1722 const struct attribute_group **groups = ndev->sysfs_groups;
1723 int error = 0;
1724
1725 device_initialize(dev);
1726 dev->class = &net_class;
1727 dev->platform_data = ndev;
1728 dev->groups = groups;
1729
1730 dev_set_name(dev, "%s", ndev->name);
1731
1732#ifdef CONFIG_SYSFS
1733 /* Allow for a device specific group */
1734 if (*groups)
1735 groups++;
1736
1737 *groups++ = &netstat_group;
1738
1739#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1740 if (ndev->ieee80211_ptr)
1741 *groups++ = &wireless_group;
1742#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1743 else if (ndev->wireless_handlers)
1744 *groups++ = &wireless_group;
1745#endif
1746#endif
1747#endif /* CONFIG_SYSFS */
1748
1749 error = device_add(dev);
1750 if (error)
1751 return error;
1752
1753 error = register_queue_kobjects(ndev);
1754 if (error) {
1755 device_del(dev);
1756 return error;
1757 }
1758
1759 pm_runtime_set_memalloc_noio(dev, true);
1760
1761 return error;
1762}
1763
1764int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1765 const void *ns)
1766{
1767 return class_create_file_ns(&net_class, class_attr, ns);
1768}
1769EXPORT_SYMBOL(netdev_class_create_file_ns);
1770
1771void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1772 const void *ns)
1773{
1774 class_remove_file_ns(&net_class, class_attr, ns);
1775}
1776EXPORT_SYMBOL(netdev_class_remove_file_ns);
1777
1778int __init netdev_kobject_init(void)
1779{
1780 kobj_ns_type_register(&net_ns_type_operations);
1781 return class_register(&net_class);
1782}