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rtnetlink: check DO_SETLINK_NOTIFY correctly in do_setlink
[linux/fpc-iii.git] / net / core / net-sysfs.c
blob927a6dcbad9668c6cb8b5afe150e8b4233d6a66b
1 /*
2 * net-sysfs.c - network device class and attributes
3 *
4 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/capability.h>
13 #include <linux/kernel.h>
14 #include <linux/netdevice.h>
15 #include <net/switchdev.h>
16 #include <linux/if_arp.h>
17 #include <linux/slab.h>
18 #include <linux/sched/signal.h>
19 #include <linux/nsproxy.h>
20 #include <net/sock.h>
21 #include <net/net_namespace.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/vmalloc.h>
24 #include <linux/export.h>
25 #include <linux/jiffies.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/of.h>
28 #include <linux/of_net.h>
29
30 #include "net-sysfs.h"
31
32 #ifdef CONFIG_SYSFS
33 static const char fmt_hex[] = "%#x\n";
34 static const char fmt_dec[] = "%d\n";
35 static const char fmt_ulong[] = "%lu\n";
36 static const char fmt_u64[] = "%llu\n";
37
38 static inline int dev_isalive(const struct net_device *dev)
39 {
40 return dev->reg_state <= NETREG_REGISTERED;
41 }
42
43 /* use same locking rules as GIF* ioctl's */
44 static ssize_t netdev_show(const struct device *dev,
45 struct device_attribute *attr, char *buf,
46 ssize_t (*format)(const struct net_device *, char *))
47 {
48 struct net_device *ndev = to_net_dev(dev);
49 ssize_t ret = -EINVAL;
50
51 read_lock(&dev_base_lock);
52 if (dev_isalive(ndev))
53 ret = (*format)(ndev, buf);
54 read_unlock(&dev_base_lock);
55
56 return ret;
57 }
58
59 /* generate a show function for simple field */
60 #define NETDEVICE_SHOW(field, format_string) \
61 static ssize_t format_##field(const struct net_device *dev, char *buf) \
62 { \
63 return sprintf(buf, format_string, dev->field); \
64 } \
65 static ssize_t field##_show(struct device *dev, \
66 struct device_attribute *attr, char *buf) \
67 { \
68 return netdev_show(dev, attr, buf, format_##field); \
69 } \
70
71 #define NETDEVICE_SHOW_RO(field, format_string) \
72 NETDEVICE_SHOW(field, format_string); \
73 static DEVICE_ATTR_RO(field)
74
75 #define NETDEVICE_SHOW_RW(field, format_string) \
76 NETDEVICE_SHOW(field, format_string); \
77 static DEVICE_ATTR_RW(field)
78
79 /* use same locking and permission rules as SIF* ioctl's */
80 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
81 const char *buf, size_t len,
82 int (*set)(struct net_device *, unsigned long))
83 {
84 struct net_device *netdev = to_net_dev(dev);
85 struct net *net = dev_net(netdev);
86 unsigned long new;
87 int ret = -EINVAL;
88
89 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
90 return -EPERM;
91
92 ret = kstrtoul(buf, 0, &new);
93 if (ret)
94 goto err;
95
96 if (!rtnl_trylock())
97 return restart_syscall();
98
99 if (dev_isalive(netdev)) {
100 ret = (*set)(netdev, new);
101 if (ret == 0)
102 ret = len;
103 }
104 rtnl_unlock();
105 err:
106 return ret;
107 }
108
109 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
110 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
111 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
112 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
113 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
114 NETDEVICE_SHOW_RO(type, fmt_dec);
115 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
116
117 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
118 char *buf)
119 {
120 struct net_device *ndev = to_net_dev(dev);
121
122 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
123 }
124 static DEVICE_ATTR_RO(iflink);
125
126 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
127 {
128 return sprintf(buf, fmt_dec, dev->name_assign_type);
129 }
130
131 static ssize_t name_assign_type_show(struct device *dev,
132 struct device_attribute *attr,
133 char *buf)
134 {
135 struct net_device *ndev = to_net_dev(dev);
136 ssize_t ret = -EINVAL;
137
138 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
139 ret = netdev_show(dev, attr, buf, format_name_assign_type);
140
141 return ret;
142 }
143 static DEVICE_ATTR_RO(name_assign_type);
144
145 /* use same locking rules as GIFHWADDR ioctl's */
146 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
147 char *buf)
148 {
149 struct net_device *ndev = to_net_dev(dev);
150 ssize_t ret = -EINVAL;
151
152 read_lock(&dev_base_lock);
153 if (dev_isalive(ndev))
154 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
155 read_unlock(&dev_base_lock);
156 return ret;
157 }
158 static DEVICE_ATTR_RO(address);
159
160 static ssize_t broadcast_show(struct device *dev,
161 struct device_attribute *attr, char *buf)
162 {
163 struct net_device *ndev = to_net_dev(dev);
164
165 if (dev_isalive(ndev))
166 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
167 return -EINVAL;
168 }
169 static DEVICE_ATTR_RO(broadcast);
170
171 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
172 {
173 if (!netif_running(dev))
174 return -EINVAL;
175 return dev_change_carrier(dev, (bool)new_carrier);
176 }
177
178 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
179 const char *buf, size_t len)
180 {
181 return netdev_store(dev, attr, buf, len, change_carrier);
182 }
183
184 static ssize_t carrier_show(struct device *dev,
185 struct device_attribute *attr, char *buf)
186 {
187 struct net_device *netdev = to_net_dev(dev);
188
189 if (netif_running(netdev))
190 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
191
192 return -EINVAL;
193 }
194 static DEVICE_ATTR_RW(carrier);
195
196 static ssize_t speed_show(struct device *dev,
197 struct device_attribute *attr, char *buf)
198 {
199 struct net_device *netdev = to_net_dev(dev);
200 int ret = -EINVAL;
201
202 if (!rtnl_trylock())
203 return restart_syscall();
204
205 if (netif_running(netdev)) {
206 struct ethtool_link_ksettings cmd;
207
208 if (!__ethtool_get_link_ksettings(netdev, &cmd))
209 ret = sprintf(buf, fmt_dec, cmd.base.speed);
210 }
211 rtnl_unlock();
212 return ret;
213 }
214 static DEVICE_ATTR_RO(speed);
215
216 static ssize_t duplex_show(struct device *dev,
217 struct device_attribute *attr, char *buf)
218 {
219 struct net_device *netdev = to_net_dev(dev);
220 int ret = -EINVAL;
221
222 if (!rtnl_trylock())
223 return restart_syscall();
224
225 if (netif_running(netdev)) {
226 struct ethtool_link_ksettings cmd;
227
228 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
229 const char *duplex;
230
231 switch (cmd.base.duplex) {
232 case DUPLEX_HALF:
233 duplex = "half";
234 break;
235 case DUPLEX_FULL:
236 duplex = "full";
237 break;
238 default:
239 duplex = "unknown";
240 break;
241 }
242 ret = sprintf(buf, "%s\n", duplex);
243 }
244 }
245 rtnl_unlock();
246 return ret;
247 }
248 static DEVICE_ATTR_RO(duplex);
249
250 static ssize_t dormant_show(struct device *dev,
251 struct device_attribute *attr, char *buf)
252 {
253 struct net_device *netdev = to_net_dev(dev);
254
255 if (netif_running(netdev))
256 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
257
258 return -EINVAL;
259 }
260 static DEVICE_ATTR_RO(dormant);
261
262 static const char *const operstates[] = {
263 "unknown",
264 "notpresent", /* currently unused */
265 "down",
266 "lowerlayerdown",
267 "testing", /* currently unused */
268 "dormant",
269 "up"
270 };
271
272 static ssize_t operstate_show(struct device *dev,
273 struct device_attribute *attr, char *buf)
274 {
275 const struct net_device *netdev = to_net_dev(dev);
276 unsigned char operstate;
277
278 read_lock(&dev_base_lock);
279 operstate = netdev->operstate;
280 if (!netif_running(netdev))
281 operstate = IF_OPER_DOWN;
282 read_unlock(&dev_base_lock);
283
284 if (operstate >= ARRAY_SIZE(operstates))
285 return -EINVAL; /* should not happen */
286
287 return sprintf(buf, "%s\n", operstates[operstate]);
288 }
289 static DEVICE_ATTR_RO(operstate);
290
291 static ssize_t carrier_changes_show(struct device *dev,
292 struct device_attribute *attr,
293 char *buf)
294 {
295 struct net_device *netdev = to_net_dev(dev);
296
297 return sprintf(buf, fmt_dec,
298 atomic_read(&netdev->carrier_changes));
299 }
300 static DEVICE_ATTR_RO(carrier_changes);
301
302 /* read-write attributes */
303
304 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
305 {
306 return dev_set_mtu(dev, (int)new_mtu);
307 }
308
309 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
310 const char *buf, size_t len)
311 {
312 return netdev_store(dev, attr, buf, len, change_mtu);
313 }
314 NETDEVICE_SHOW_RW(mtu, fmt_dec);
315
316 static int change_flags(struct net_device *dev, unsigned long new_flags)
317 {
318 return dev_change_flags(dev, (unsigned int)new_flags);
319 }
320
321 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
322 const char *buf, size_t len)
323 {
324 return netdev_store(dev, attr, buf, len, change_flags);
325 }
326 NETDEVICE_SHOW_RW(flags, fmt_hex);
327
328 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
329 {
330 unsigned int orig_len = dev->tx_queue_len;
331 int res;
332
333 if (new_len != (unsigned int)new_len)
334 return -ERANGE;
335
336 if (new_len != orig_len) {
337 dev->tx_queue_len = new_len;
338 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
339 res = notifier_to_errno(res);
340 if (res) {
341 netdev_err(dev,
342 "refused to change device tx_queue_len\n");
343 dev->tx_queue_len = orig_len;
344 return -EFAULT;
345 }
346 }
347
348 return 0;
349 }
350
351 static ssize_t tx_queue_len_store(struct device *dev,
352 struct device_attribute *attr,
353 const char *buf, size_t len)
354 {
355 if (!capable(CAP_NET_ADMIN))
356 return -EPERM;
357
358 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
359 }
360 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
361
362 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
363 {
364 dev->gro_flush_timeout = val;
365 return 0;
366 }
367
368 static ssize_t gro_flush_timeout_store(struct device *dev,
369 struct device_attribute *attr,
370 const char *buf, size_t len)
371 {
372 if (!capable(CAP_NET_ADMIN))
373 return -EPERM;
374
375 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
376 }
377 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
378
379 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
380 const char *buf, size_t len)
381 {
382 struct net_device *netdev = to_net_dev(dev);
383 struct net *net = dev_net(netdev);
384 size_t count = len;
385 ssize_t ret;
386
387 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
388 return -EPERM;
389
390 /* ignore trailing newline */
391 if (len > 0 && buf[len - 1] == '\n')
392 --count;
393
394 if (!rtnl_trylock())
395 return restart_syscall();
396 ret = dev_set_alias(netdev, buf, count);
397 rtnl_unlock();
398
399 return ret < 0 ? ret : len;
400 }
401
402 static ssize_t ifalias_show(struct device *dev,
403 struct device_attribute *attr, char *buf)
404 {
405 const struct net_device *netdev = to_net_dev(dev);
406 ssize_t ret = 0;
407
408 if (!rtnl_trylock())
409 return restart_syscall();
410 if (netdev->ifalias)
411 ret = sprintf(buf, "%s\n", netdev->ifalias);
412 rtnl_unlock();
413 return ret;
414 }
415 static DEVICE_ATTR_RW(ifalias);
416
417 static int change_group(struct net_device *dev, unsigned long new_group)
418 {
419 dev_set_group(dev, (int)new_group);
420 return 0;
421 }
422
423 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
424 const char *buf, size_t len)
425 {
426 return netdev_store(dev, attr, buf, len, change_group);
427 }
428 NETDEVICE_SHOW(group, fmt_dec);
429 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
430
431 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
432 {
433 return dev_change_proto_down(dev, (bool)proto_down);
434 }
435
436 static ssize_t proto_down_store(struct device *dev,
437 struct device_attribute *attr,
438 const char *buf, size_t len)
439 {
440 return netdev_store(dev, attr, buf, len, change_proto_down);
441 }
442 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
443
444 static ssize_t phys_port_id_show(struct device *dev,
445 struct device_attribute *attr, char *buf)
446 {
447 struct net_device *netdev = to_net_dev(dev);
448 ssize_t ret = -EINVAL;
449
450 if (!rtnl_trylock())
451 return restart_syscall();
452
453 if (dev_isalive(netdev)) {
454 struct netdev_phys_item_id ppid;
455
456 ret = dev_get_phys_port_id(netdev, &ppid);
457 if (!ret)
458 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
459 }
460 rtnl_unlock();
461
462 return ret;
463 }
464 static DEVICE_ATTR_RO(phys_port_id);
465
466 static ssize_t phys_port_name_show(struct device *dev,
467 struct device_attribute *attr, char *buf)
468 {
469 struct net_device *netdev = to_net_dev(dev);
470 ssize_t ret = -EINVAL;
471
472 if (!rtnl_trylock())
473 return restart_syscall();
474
475 if (dev_isalive(netdev)) {
476 char name[IFNAMSIZ];
477
478 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
479 if (!ret)
480 ret = sprintf(buf, "%s\n", name);
481 }
482 rtnl_unlock();
483
484 return ret;
485 }
486 static DEVICE_ATTR_RO(phys_port_name);
487
488 static ssize_t phys_switch_id_show(struct device *dev,
489 struct device_attribute *attr, char *buf)
490 {
491 struct net_device *netdev = to_net_dev(dev);
492 ssize_t ret = -EINVAL;
493
494 if (!rtnl_trylock())
495 return restart_syscall();
496
497 if (dev_isalive(netdev)) {
498 struct switchdev_attr attr = {
499 .orig_dev = netdev,
500 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
501 .flags = SWITCHDEV_F_NO_RECURSE,
502 };
503
504 ret = switchdev_port_attr_get(netdev, &attr);
505 if (!ret)
506 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
507 attr.u.ppid.id);
508 }
509 rtnl_unlock();
510
511 return ret;
512 }
513 static DEVICE_ATTR_RO(phys_switch_id);
514
515 static struct attribute *net_class_attrs[] __ro_after_init = {
516 &dev_attr_netdev_group.attr,
517 &dev_attr_type.attr,
518 &dev_attr_dev_id.attr,
519 &dev_attr_dev_port.attr,
520 &dev_attr_iflink.attr,
521 &dev_attr_ifindex.attr,
522 &dev_attr_name_assign_type.attr,
523 &dev_attr_addr_assign_type.attr,
524 &dev_attr_addr_len.attr,
525 &dev_attr_link_mode.attr,
526 &dev_attr_address.attr,
527 &dev_attr_broadcast.attr,
528 &dev_attr_speed.attr,
529 &dev_attr_duplex.attr,
530 &dev_attr_dormant.attr,
531 &dev_attr_operstate.attr,
532 &dev_attr_carrier_changes.attr,
533 &dev_attr_ifalias.attr,
534 &dev_attr_carrier.attr,
535 &dev_attr_mtu.attr,
536 &dev_attr_flags.attr,
537 &dev_attr_tx_queue_len.attr,
538 &dev_attr_gro_flush_timeout.attr,
539 &dev_attr_phys_port_id.attr,
540 &dev_attr_phys_port_name.attr,
541 &dev_attr_phys_switch_id.attr,
542 &dev_attr_proto_down.attr,
543 NULL,
544 };
545 ATTRIBUTE_GROUPS(net_class);
546
547 /* Show a given an attribute in the statistics group */
548 static ssize_t netstat_show(const struct device *d,
549 struct device_attribute *attr, char *buf,
550 unsigned long offset)
551 {
552 struct net_device *dev = to_net_dev(d);
553 ssize_t ret = -EINVAL;
554
555 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
556 offset % sizeof(u64) != 0);
557
558 read_lock(&dev_base_lock);
559 if (dev_isalive(dev)) {
560 struct rtnl_link_stats64 temp;
561 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
562
563 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
564 }
565 read_unlock(&dev_base_lock);
566 return ret;
567 }
568
569 /* generate a read-only statistics attribute */
570 #define NETSTAT_ENTRY(name) \
571 static ssize_t name##_show(struct device *d, \
572 struct device_attribute *attr, char *buf) \
573 { \
574 return netstat_show(d, attr, buf, \
575 offsetof(struct rtnl_link_stats64, name)); \
576 } \
577 static DEVICE_ATTR_RO(name)
578
579 NETSTAT_ENTRY(rx_packets);
580 NETSTAT_ENTRY(tx_packets);
581 NETSTAT_ENTRY(rx_bytes);
582 NETSTAT_ENTRY(tx_bytes);
583 NETSTAT_ENTRY(rx_errors);
584 NETSTAT_ENTRY(tx_errors);
585 NETSTAT_ENTRY(rx_dropped);
586 NETSTAT_ENTRY(tx_dropped);
587 NETSTAT_ENTRY(multicast);
588 NETSTAT_ENTRY(collisions);
589 NETSTAT_ENTRY(rx_length_errors);
590 NETSTAT_ENTRY(rx_over_errors);
591 NETSTAT_ENTRY(rx_crc_errors);
592 NETSTAT_ENTRY(rx_frame_errors);
593 NETSTAT_ENTRY(rx_fifo_errors);
594 NETSTAT_ENTRY(rx_missed_errors);
595 NETSTAT_ENTRY(tx_aborted_errors);
596 NETSTAT_ENTRY(tx_carrier_errors);
597 NETSTAT_ENTRY(tx_fifo_errors);
598 NETSTAT_ENTRY(tx_heartbeat_errors);
599 NETSTAT_ENTRY(tx_window_errors);
600 NETSTAT_ENTRY(rx_compressed);
601 NETSTAT_ENTRY(tx_compressed);
602 NETSTAT_ENTRY(rx_nohandler);
603
604 static struct attribute *netstat_attrs[] __ro_after_init = {
605 &dev_attr_rx_packets.attr,
606 &dev_attr_tx_packets.attr,
607 &dev_attr_rx_bytes.attr,
608 &dev_attr_tx_bytes.attr,
609 &dev_attr_rx_errors.attr,
610 &dev_attr_tx_errors.attr,
611 &dev_attr_rx_dropped.attr,
612 &dev_attr_tx_dropped.attr,
613 &dev_attr_multicast.attr,
614 &dev_attr_collisions.attr,
615 &dev_attr_rx_length_errors.attr,
616 &dev_attr_rx_over_errors.attr,
617 &dev_attr_rx_crc_errors.attr,
618 &dev_attr_rx_frame_errors.attr,
619 &dev_attr_rx_fifo_errors.attr,
620 &dev_attr_rx_missed_errors.attr,
621 &dev_attr_tx_aborted_errors.attr,
622 &dev_attr_tx_carrier_errors.attr,
623 &dev_attr_tx_fifo_errors.attr,
624 &dev_attr_tx_heartbeat_errors.attr,
625 &dev_attr_tx_window_errors.attr,
626 &dev_attr_rx_compressed.attr,
627 &dev_attr_tx_compressed.attr,
628 &dev_attr_rx_nohandler.attr,
629 NULL
630 };
631
632 static const struct attribute_group netstat_group = {
633 .name = "statistics",
634 .attrs = netstat_attrs,
635 };
636
637 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
638 static struct attribute *wireless_attrs[] = {
639 NULL
640 };
641
642 static const struct attribute_group wireless_group = {
643 .name = "wireless",
644 .attrs = wireless_attrs,
645 };
646 #endif
647
648 #else /* CONFIG_SYSFS */
649 #define net_class_groups NULL
650 #endif /* CONFIG_SYSFS */
651
652 #ifdef CONFIG_SYSFS
653 #define to_rx_queue_attr(_attr) \
654 container_of(_attr, struct rx_queue_attribute, attr)
655
656 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
657
658 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
659 char *buf)
660 {
661 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
662 struct netdev_rx_queue *queue = to_rx_queue(kobj);
663
664 if (!attribute->show)
665 return -EIO;
666
667 return attribute->show(queue, buf);
668 }
669
670 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
671 const char *buf, size_t count)
672 {
673 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
674 struct netdev_rx_queue *queue = to_rx_queue(kobj);
675
676 if (!attribute->store)
677 return -EIO;
678
679 return attribute->store(queue, buf, count);
680 }
681
682 static const struct sysfs_ops rx_queue_sysfs_ops = {
683 .show = rx_queue_attr_show,
684 .store = rx_queue_attr_store,
685 };
686
687 #ifdef CONFIG_RPS
688 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
689 {
690 struct rps_map *map;
691 cpumask_var_t mask;
692 int i, len;
693
694 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
695 return -ENOMEM;
696
697 rcu_read_lock();
698 map = rcu_dereference(queue->rps_map);
699 if (map)
700 for (i = 0; i < map->len; i++)
701 cpumask_set_cpu(map->cpus[i], mask);
702
703 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
704 rcu_read_unlock();
705 free_cpumask_var(mask);
706
707 return len < PAGE_SIZE ? len : -EINVAL;
708 }
709
710 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
711 const char *buf, size_t len)
712 {
713 struct rps_map *old_map, *map;
714 cpumask_var_t mask;
715 int err, cpu, i;
716 static DEFINE_MUTEX(rps_map_mutex);
717
718 if (!capable(CAP_NET_ADMIN))
719 return -EPERM;
720
721 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
722 return -ENOMEM;
723
724 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
725 if (err) {
726 free_cpumask_var(mask);
727 return err;
728 }
729
730 map = kzalloc(max_t(unsigned int,
731 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
732 GFP_KERNEL);
733 if (!map) {
734 free_cpumask_var(mask);
735 return -ENOMEM;
736 }
737
738 i = 0;
739 for_each_cpu_and(cpu, mask, cpu_online_mask)
740 map->cpus[i++] = cpu;
741
742 if (i) {
743 map->len = i;
744 } else {
745 kfree(map);
746 map = NULL;
747 }
748
749 mutex_lock(&rps_map_mutex);
750 old_map = rcu_dereference_protected(queue->rps_map,
751 mutex_is_locked(&rps_map_mutex));
752 rcu_assign_pointer(queue->rps_map, map);
753
754 if (map)
755 static_key_slow_inc(&rps_needed);
756 if (old_map)
757 static_key_slow_dec(&rps_needed);
758
759 mutex_unlock(&rps_map_mutex);
760
761 if (old_map)
762 kfree_rcu(old_map, rcu);
763
764 free_cpumask_var(mask);
765 return len;
766 }
767
768 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
769 char *buf)
770 {
771 struct rps_dev_flow_table *flow_table;
772 unsigned long val = 0;
773
774 rcu_read_lock();
775 flow_table = rcu_dereference(queue->rps_flow_table);
776 if (flow_table)
777 val = (unsigned long)flow_table->mask + 1;
778 rcu_read_unlock();
779
780 return sprintf(buf, "%lu\n", val);
781 }
782
783 static void rps_dev_flow_table_release(struct rcu_head *rcu)
784 {
785 struct rps_dev_flow_table *table = container_of(rcu,
786 struct rps_dev_flow_table, rcu);
787 vfree(table);
788 }
789
790 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
791 const char *buf, size_t len)
792 {
793 unsigned long mask, count;
794 struct rps_dev_flow_table *table, *old_table;
795 static DEFINE_SPINLOCK(rps_dev_flow_lock);
796 int rc;
797
798 if (!capable(CAP_NET_ADMIN))
799 return -EPERM;
800
801 rc = kstrtoul(buf, 0, &count);
802 if (rc < 0)
803 return rc;
804
805 if (count) {
806 mask = count - 1;
807 /* mask = roundup_pow_of_two(count) - 1;
808 * without overflows...
809 */
810 while ((mask | (mask >> 1)) != mask)
811 mask |= (mask >> 1);
812 /* On 64 bit arches, must check mask fits in table->mask (u32),
813 * and on 32bit arches, must check
814 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
815 */
816 #if BITS_PER_LONG > 32
817 if (mask > (unsigned long)(u32)mask)
818 return -EINVAL;
819 #else
820 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
821 / sizeof(struct rps_dev_flow)) {
822 /* Enforce a limit to prevent overflow */
823 return -EINVAL;
824 }
825 #endif
826 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
827 if (!table)
828 return -ENOMEM;
829
830 table->mask = mask;
831 for (count = 0; count <= mask; count++)
832 table->flows[count].cpu = RPS_NO_CPU;
833 } else {
834 table = NULL;
835 }
836
837 spin_lock(&rps_dev_flow_lock);
838 old_table = rcu_dereference_protected(queue->rps_flow_table,
839 lockdep_is_held(&rps_dev_flow_lock));
840 rcu_assign_pointer(queue->rps_flow_table, table);
841 spin_unlock(&rps_dev_flow_lock);
842
843 if (old_table)
844 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
845
846 return len;
847 }
848
849 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
850 = __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
851
852 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
853 = __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
854 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
855 #endif /* CONFIG_RPS */
856
857 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
858 #ifdef CONFIG_RPS
859 &rps_cpus_attribute.attr,
860 &rps_dev_flow_table_cnt_attribute.attr,
861 #endif
862 NULL
863 };
864
865 static void rx_queue_release(struct kobject *kobj)
866 {
867 struct netdev_rx_queue *queue = to_rx_queue(kobj);
868 #ifdef CONFIG_RPS
869 struct rps_map *map;
870 struct rps_dev_flow_table *flow_table;
871
872 map = rcu_dereference_protected(queue->rps_map, 1);
873 if (map) {
874 RCU_INIT_POINTER(queue->rps_map, NULL);
875 kfree_rcu(map, rcu);
876 }
877
878 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
879 if (flow_table) {
880 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
881 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
882 }
883 #endif
884
885 memset(kobj, 0, sizeof(*kobj));
886 dev_put(queue->dev);
887 }
888
889 static const void *rx_queue_namespace(struct kobject *kobj)
890 {
891 struct netdev_rx_queue *queue = to_rx_queue(kobj);
892 struct device *dev = &queue->dev->dev;
893 const void *ns = NULL;
894
895 if (dev->class && dev->class->ns_type)
896 ns = dev->class->namespace(dev);
897
898 return ns;
899 }
900
901 static struct kobj_type rx_queue_ktype __ro_after_init = {
902 .sysfs_ops = &rx_queue_sysfs_ops,
903 .release = rx_queue_release,
904 .default_attrs = rx_queue_default_attrs,
905 .namespace = rx_queue_namespace
906 };
907
908 static int rx_queue_add_kobject(struct net_device *dev, int index)
909 {
910 struct netdev_rx_queue *queue = dev->_rx + index;
911 struct kobject *kobj = &queue->kobj;
912 int error = 0;
913
914 kobj->kset = dev->queues_kset;
915 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
916 "rx-%u", index);
917 if (error)
918 return error;
919
920 if (dev->sysfs_rx_queue_group) {
921 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
922 if (error) {
923 kobject_put(kobj);
924 return error;
925 }
926 }
927
928 kobject_uevent(kobj, KOBJ_ADD);
929 dev_hold(queue->dev);
930
931 return error;
932 }
933 #endif /* CONFIG_SYSFS */
934
935 int
936 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
937 {
938 #ifdef CONFIG_SYSFS
939 int i;
940 int error = 0;
941
942 #ifndef CONFIG_RPS
943 if (!dev->sysfs_rx_queue_group)
944 return 0;
945 #endif
946 for (i = old_num; i < new_num; i++) {
947 error = rx_queue_add_kobject(dev, i);
948 if (error) {
949 new_num = old_num;
950 break;
951 }
952 }
953
954 while (--i >= new_num) {
955 struct kobject *kobj = &dev->_rx[i].kobj;
956
957 if (!atomic_read(&dev_net(dev)->count))
958 kobj->uevent_suppress = 1;
959 if (dev->sysfs_rx_queue_group)
960 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
961 kobject_put(kobj);
962 }
963
964 return error;
965 #else
966 return 0;
967 #endif
968 }
969
970 #ifdef CONFIG_SYSFS
971 /*
972 * netdev_queue sysfs structures and functions.
973 */
974 struct netdev_queue_attribute {
975 struct attribute attr;
976 ssize_t (*show)(struct netdev_queue *queue, char *buf);
977 ssize_t (*store)(struct netdev_queue *queue,
978 const char *buf, size_t len);
979 };
980 #define to_netdev_queue_attr(_attr) \
981 container_of(_attr, struct netdev_queue_attribute, attr)
982
983 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
984
985 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
986 struct attribute *attr, char *buf)
987 {
988 const struct netdev_queue_attribute *attribute
989 = to_netdev_queue_attr(attr);
990 struct netdev_queue *queue = to_netdev_queue(kobj);
991
992 if (!attribute->show)
993 return -EIO;
994
995 return attribute->show(queue, buf);
996 }
997
998 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
999 struct attribute *attr,
1000 const char *buf, size_t count)
1001 {
1002 const struct netdev_queue_attribute *attribute
1003 = to_netdev_queue_attr(attr);
1004 struct netdev_queue *queue = to_netdev_queue(kobj);
1005
1006 if (!attribute->store)
1007 return -EIO;
1008
1009 return attribute->store(queue, buf, count);
1010 }
1011
1012 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1013 .show = netdev_queue_attr_show,
1014 .store = netdev_queue_attr_store,
1015 };
1016
1017 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1018 {
1019 unsigned long trans_timeout;
1020
1021 spin_lock_irq(&queue->_xmit_lock);
1022 trans_timeout = queue->trans_timeout;
1023 spin_unlock_irq(&queue->_xmit_lock);
1024
1025 return sprintf(buf, "%lu", trans_timeout);
1026 }
1027
1028 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1029 {
1030 struct net_device *dev = queue->dev;
1031 unsigned int i;
1032
1033 i = queue - dev->_tx;
1034 BUG_ON(i >= dev->num_tx_queues);
1035
1036 return i;
1037 }
1038
1039 static ssize_t traffic_class_show(struct netdev_queue *queue,
1040 char *buf)
1041 {
1042 struct net_device *dev = queue->dev;
1043 int index = get_netdev_queue_index(queue);
1044 int tc = netdev_txq_to_tc(dev, index);
1045
1046 if (tc < 0)
1047 return -EINVAL;
1048
1049 return sprintf(buf, "%u\n", tc);
1050 }
1051
1052 #ifdef CONFIG_XPS
1053 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1054 char *buf)
1055 {
1056 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1057 }
1058
1059 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1060 const char *buf, size_t len)
1061 {
1062 struct net_device *dev = queue->dev;
1063 int err, index = get_netdev_queue_index(queue);
1064 u32 rate = 0;
1065
1066 err = kstrtou32(buf, 10, &rate);
1067 if (err < 0)
1068 return err;
1069
1070 if (!rtnl_trylock())
1071 return restart_syscall();
1072
1073 err = -EOPNOTSUPP;
1074 if (dev->netdev_ops->ndo_set_tx_maxrate)
1075 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1076
1077 rtnl_unlock();
1078 if (!err) {
1079 queue->tx_maxrate = rate;
1080 return len;
1081 }
1082 return err;
1083 }
1084
1085 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1086 = __ATTR_RW(tx_maxrate);
1087 #endif
1088
1089 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1090 = __ATTR_RO(tx_timeout);
1091
1092 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1093 = __ATTR_RO(traffic_class);
1094
1095 #ifdef CONFIG_BQL
1096 /*
1097 * Byte queue limits sysfs structures and functions.
1098 */
1099 static ssize_t bql_show(char *buf, unsigned int value)
1100 {
1101 return sprintf(buf, "%u\n", value);
1102 }
1103
1104 static ssize_t bql_set(const char *buf, const size_t count,
1105 unsigned int *pvalue)
1106 {
1107 unsigned int value;
1108 int err;
1109
1110 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1111 value = DQL_MAX_LIMIT;
1112 } else {
1113 err = kstrtouint(buf, 10, &value);
1114 if (err < 0)
1115 return err;
1116 if (value > DQL_MAX_LIMIT)
1117 return -EINVAL;
1118 }
1119
1120 *pvalue = value;
1121
1122 return count;
1123 }
1124
1125 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1126 char *buf)
1127 {
1128 struct dql *dql = &queue->dql;
1129
1130 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1131 }
1132
1133 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1134 const char *buf, size_t len)
1135 {
1136 struct dql *dql = &queue->dql;
1137 unsigned int value;
1138 int err;
1139
1140 err = kstrtouint(buf, 10, &value);
1141 if (err < 0)
1142 return err;
1143
1144 dql->slack_hold_time = msecs_to_jiffies(value);
1145
1146 return len;
1147 }
1148
1149 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1150 = __ATTR(hold_time, S_IRUGO | S_IWUSR,
1151 bql_show_hold_time, bql_set_hold_time);
1152
1153 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1154 char *buf)
1155 {
1156 struct dql *dql = &queue->dql;
1157
1158 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1159 }
1160
1161 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1162 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1163
1164 #define BQL_ATTR(NAME, FIELD) \
1165 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1166 char *buf) \
1167 { \
1168 return bql_show(buf, queue->dql.FIELD); \
1169 } \
1170 \
1171 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1172 const char *buf, size_t len) \
1173 { \
1174 return bql_set(buf, len, &queue->dql.FIELD); \
1175 } \
1176 \
1177 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1178 = __ATTR(NAME, S_IRUGO | S_IWUSR, \
1179 bql_show_ ## NAME, bql_set_ ## NAME)
1180
1181 BQL_ATTR(limit, limit);
1182 BQL_ATTR(limit_max, max_limit);
1183 BQL_ATTR(limit_min, min_limit);
1184
1185 static struct attribute *dql_attrs[] __ro_after_init = {
1186 &bql_limit_attribute.attr,
1187 &bql_limit_max_attribute.attr,
1188 &bql_limit_min_attribute.attr,
1189 &bql_hold_time_attribute.attr,
1190 &bql_inflight_attribute.attr,
1191 NULL
1192 };
1193
1194 static const struct attribute_group dql_group = {
1195 .name = "byte_queue_limits",
1196 .attrs = dql_attrs,
1197 };
1198 #endif /* CONFIG_BQL */
1199
1200 #ifdef CONFIG_XPS
1201 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1202 char *buf)
1203 {
1204 struct net_device *dev = queue->dev;
1205 int cpu, len, num_tc = 1, tc = 0;
1206 struct xps_dev_maps *dev_maps;
1207 cpumask_var_t mask;
1208 unsigned long index;
1209
1210 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1211 return -ENOMEM;
1212
1213 index = get_netdev_queue_index(queue);
1214
1215 if (dev->num_tc) {
1216 num_tc = dev->num_tc;
1217 tc = netdev_txq_to_tc(dev, index);
1218 if (tc < 0)
1219 return -EINVAL;
1220 }
1221
1222 rcu_read_lock();
1223 dev_maps = rcu_dereference(dev->xps_maps);
1224 if (dev_maps) {
1225 for_each_possible_cpu(cpu) {
1226 int i, tci = cpu * num_tc + tc;
1227 struct xps_map *map;
1228
1229 map = rcu_dereference(dev_maps->cpu_map[tci]);
1230 if (!map)
1231 continue;
1232
1233 for (i = map->len; i--;) {
1234 if (map->queues[i] == index) {
1235 cpumask_set_cpu(cpu, mask);
1236 break;
1237 }
1238 }
1239 }
1240 }
1241 rcu_read_unlock();
1242
1243 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1244 free_cpumask_var(mask);
1245 return len < PAGE_SIZE ? len : -EINVAL;
1246 }
1247
1248 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1249 const char *buf, size_t len)
1250 {
1251 struct net_device *dev = queue->dev;
1252 unsigned long index;
1253 cpumask_var_t mask;
1254 int err;
1255
1256 if (!capable(CAP_NET_ADMIN))
1257 return -EPERM;
1258
1259 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1260 return -ENOMEM;
1261
1262 index = get_netdev_queue_index(queue);
1263
1264 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1265 if (err) {
1266 free_cpumask_var(mask);
1267 return err;
1268 }
1269
1270 err = netif_set_xps_queue(dev, mask, index);
1271
1272 free_cpumask_var(mask);
1273
1274 return err ? : len;
1275 }
1276
1277 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1278 = __ATTR_RW(xps_cpus);
1279 #endif /* CONFIG_XPS */
1280
1281 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1282 &queue_trans_timeout.attr,
1283 &queue_traffic_class.attr,
1284 #ifdef CONFIG_XPS
1285 &xps_cpus_attribute.attr,
1286 &queue_tx_maxrate.attr,
1287 #endif
1288 NULL
1289 };
1290
1291 static void netdev_queue_release(struct kobject *kobj)
1292 {
1293 struct netdev_queue *queue = to_netdev_queue(kobj);
1294
1295 memset(kobj, 0, sizeof(*kobj));
1296 dev_put(queue->dev);
1297 }
1298
1299 static const void *netdev_queue_namespace(struct kobject *kobj)
1300 {
1301 struct netdev_queue *queue = to_netdev_queue(kobj);
1302 struct device *dev = &queue->dev->dev;
1303 const void *ns = NULL;
1304
1305 if (dev->class && dev->class->ns_type)
1306 ns = dev->class->namespace(dev);
1307
1308 return ns;
1309 }
1310
1311 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1312 .sysfs_ops = &netdev_queue_sysfs_ops,
1313 .release = netdev_queue_release,
1314 .default_attrs = netdev_queue_default_attrs,
1315 .namespace = netdev_queue_namespace,
1316 };
1317
1318 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1319 {
1320 struct netdev_queue *queue = dev->_tx + index;
1321 struct kobject *kobj = &queue->kobj;
1322 int error = 0;
1323
1324 kobj->kset = dev->queues_kset;
1325 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1326 "tx-%u", index);
1327 if (error)
1328 return error;
1329
1330 #ifdef CONFIG_BQL
1331 error = sysfs_create_group(kobj, &dql_group);
1332 if (error) {
1333 kobject_put(kobj);
1334 return error;
1335 }
1336 #endif
1337
1338 kobject_uevent(kobj, KOBJ_ADD);
1339 dev_hold(queue->dev);
1340
1341 return 0;
1342 }
1343 #endif /* CONFIG_SYSFS */
1344
1345 int
1346 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1347 {
1348 #ifdef CONFIG_SYSFS
1349 int i;
1350 int error = 0;
1351
1352 for (i = old_num; i < new_num; i++) {
1353 error = netdev_queue_add_kobject(dev, i);
1354 if (error) {
1355 new_num = old_num;
1356 break;
1357 }
1358 }
1359
1360 while (--i >= new_num) {
1361 struct netdev_queue *queue = dev->_tx + i;
1362
1363 if (!atomic_read(&dev_net(dev)->count))
1364 queue->kobj.uevent_suppress = 1;
1365 #ifdef CONFIG_BQL
1366 sysfs_remove_group(&queue->kobj, &dql_group);
1367 #endif
1368 kobject_put(&queue->kobj);
1369 }
1370
1371 return error;
1372 #else
1373 return 0;
1374 #endif /* CONFIG_SYSFS */
1375 }
1376
1377 static int register_queue_kobjects(struct net_device *dev)
1378 {
1379 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1380
1381 #ifdef CONFIG_SYSFS
1382 dev->queues_kset = kset_create_and_add("queues",
1383 NULL, &dev->dev.kobj);
1384 if (!dev->queues_kset)
1385 return -ENOMEM;
1386 real_rx = dev->real_num_rx_queues;
1387 #endif
1388 real_tx = dev->real_num_tx_queues;
1389
1390 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1391 if (error)
1392 goto error;
1393 rxq = real_rx;
1394
1395 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1396 if (error)
1397 goto error;
1398 txq = real_tx;
1399
1400 return 0;
1401
1402 error:
1403 netdev_queue_update_kobjects(dev, txq, 0);
1404 net_rx_queue_update_kobjects(dev, rxq, 0);
1405 return error;
1406 }
1407
1408 static void remove_queue_kobjects(struct net_device *dev)
1409 {
1410 int real_rx = 0, real_tx = 0;
1411
1412 #ifdef CONFIG_SYSFS
1413 real_rx = dev->real_num_rx_queues;
1414 #endif
1415 real_tx = dev->real_num_tx_queues;
1416
1417 net_rx_queue_update_kobjects(dev, real_rx, 0);
1418 netdev_queue_update_kobjects(dev, real_tx, 0);
1419 #ifdef CONFIG_SYSFS
1420 kset_unregister(dev->queues_kset);
1421 #endif
1422 }
1423
1424 static bool net_current_may_mount(void)
1425 {
1426 struct net *net = current->nsproxy->net_ns;
1427
1428 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1429 }
1430
1431 static void *net_grab_current_ns(void)
1432 {
1433 struct net *ns = current->nsproxy->net_ns;
1434 #ifdef CONFIG_NET_NS
1435 if (ns)
1436 refcount_inc(&ns->passive);
1437 #endif
1438 return ns;
1439 }
1440
1441 static const void *net_initial_ns(void)
1442 {
1443 return &init_net;
1444 }
1445
1446 static const void *net_netlink_ns(struct sock *sk)
1447 {
1448 return sock_net(sk);
1449 }
1450
1451 const struct kobj_ns_type_operations net_ns_type_operations = {
1452 .type = KOBJ_NS_TYPE_NET,
1453 .current_may_mount = net_current_may_mount,
1454 .grab_current_ns = net_grab_current_ns,
1455 .netlink_ns = net_netlink_ns,
1456 .initial_ns = net_initial_ns,
1457 .drop_ns = net_drop_ns,
1458 };
1459 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1460
1461 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1462 {
1463 struct net_device *dev = to_net_dev(d);
1464 int retval;
1465
1466 /* pass interface to uevent. */
1467 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1468 if (retval)
1469 goto exit;
1470
1471 /* pass ifindex to uevent.
1472 * ifindex is useful as it won't change (interface name may change)
1473 * and is what RtNetlink uses natively.
1474 */
1475 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1476
1477 exit:
1478 return retval;
1479 }
1480
1481 /*
1482 * netdev_release -- destroy and free a dead device.
1483 * Called when last reference to device kobject is gone.
1484 */
1485 static void netdev_release(struct device *d)
1486 {
1487 struct net_device *dev = to_net_dev(d);
1488
1489 BUG_ON(dev->reg_state != NETREG_RELEASED);
1490
1491 kfree(dev->ifalias);
1492 netdev_freemem(dev);
1493 }
1494
1495 static const void *net_namespace(struct device *d)
1496 {
1497 struct net_device *dev = to_net_dev(d);
1498
1499 return dev_net(dev);
1500 }
1501
1502 static struct class net_class __ro_after_init = {
1503 .name = "net",
1504 .dev_release = netdev_release,
1505 .dev_groups = net_class_groups,
1506 .dev_uevent = netdev_uevent,
1507 .ns_type = &net_ns_type_operations,
1508 .namespace = net_namespace,
1509 };
1510
1511 #ifdef CONFIG_OF_NET
1512 static int of_dev_node_match(struct device *dev, const void *data)
1513 {
1514 int ret = 0;
1515
1516 if (dev->parent)
1517 ret = dev->parent->of_node == data;
1518
1519 return ret == 0 ? dev->of_node == data : ret;
1520 }
1521
1522 /*
1523 * of_find_net_device_by_node - lookup the net device for the device node
1524 * @np: OF device node
1525 *
1526 * Looks up the net_device structure corresponding with the device node.
1527 * If successful, returns a pointer to the net_device with the embedded
1528 * struct device refcount incremented by one, or NULL on failure. The
1529 * refcount must be dropped when done with the net_device.
1530 */
1531 struct net_device *of_find_net_device_by_node(struct device_node *np)
1532 {
1533 struct device *dev;
1534
1535 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1536 if (!dev)
1537 return NULL;
1538
1539 return to_net_dev(dev);
1540 }
1541 EXPORT_SYMBOL(of_find_net_device_by_node);
1542 #endif
1543
1544 /* Delete sysfs entries but hold kobject reference until after all
1545 * netdev references are gone.
1546 */
1547 void netdev_unregister_kobject(struct net_device *ndev)
1548 {
1549 struct device *dev = &ndev->dev;
1550
1551 if (!atomic_read(&dev_net(ndev)->count))
1552 dev_set_uevent_suppress(dev, 1);
1553
1554 kobject_get(&dev->kobj);
1555
1556 remove_queue_kobjects(ndev);
1557
1558 pm_runtime_set_memalloc_noio(dev, false);
1559
1560 device_del(dev);
1561 }
1562
1563 /* Create sysfs entries for network device. */
1564 int netdev_register_kobject(struct net_device *ndev)
1565 {
1566 struct device *dev = &ndev->dev;
1567 const struct attribute_group **groups = ndev->sysfs_groups;
1568 int error = 0;
1569
1570 device_initialize(dev);
1571 dev->class = &net_class;
1572 dev->platform_data = ndev;
1573 dev->groups = groups;
1574
1575 dev_set_name(dev, "%s", ndev->name);
1576
1577 #ifdef CONFIG_SYSFS
1578 /* Allow for a device specific group */
1579 if (*groups)
1580 groups++;
1581
1582 *groups++ = &netstat_group;
1583
1584 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1585 if (ndev->ieee80211_ptr)
1586 *groups++ = &wireless_group;
1587 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1588 else if (ndev->wireless_handlers)
1589 *groups++ = &wireless_group;
1590 #endif
1591 #endif
1592 #endif /* CONFIG_SYSFS */
1593
1594 error = device_add(dev);
1595 if (error)
1596 return error;
1597
1598 error = register_queue_kobjects(ndev);
1599 if (error) {
1600 device_del(dev);
1601 return error;
1602 }
1603
1604 pm_runtime_set_memalloc_noio(dev, true);
1605
1606 return error;
1607 }
1608
1609 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1610 const void *ns)
1611 {
1612 return class_create_file_ns(&net_class, class_attr, ns);
1613 }
1614 EXPORT_SYMBOL(netdev_class_create_file_ns);
1615
1616 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1617 const void *ns)
1618 {
1619 class_remove_file_ns(&net_class, class_attr, ns);
1620 }
1621 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1622
1623 int __init netdev_kobject_init(void)
1624 {
1625 kobj_ns_type_register(&net_ns_type_operations);
1626 return class_register(&net_class);
1627 }
Linux with added FPC-III support