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12#include <linux/capability.h>
13#include <linux/kernel.h>
14#include <linux/netdevice.h>
15#include <linux/if_arp.h>
16#include <linux/slab.h>
17#include <linux/nsproxy.h>
18#include <net/sock.h>
19#include <net/net_namespace.h>
20#include <linux/rtnetlink.h>
21#include <linux/wireless.h>
22#include <linux/vmalloc.h>
23#include <linux/export.h>
24#include <net/wext.h>
25
26#include "net-sysfs.h"
27
28#ifdef CONFIG_SYSFS
29static const char fmt_hex[] = "%#x\n";
30static const char fmt_long_hex[] = "%#lx\n";
31static const char fmt_dec[] = "%d\n";
32static const char fmt_udec[] = "%u\n";
33static const char fmt_ulong[] = "%lu\n";
34static const char fmt_u64[] = "%llu\n";
35
36static inline int dev_isalive(const struct net_device *dev)
37{
38 return dev->reg_state <= NETREG_REGISTERED;
39}
40
41
42static ssize_t netdev_show(const struct device *dev,
43 struct device_attribute *attr, char *buf,
44 ssize_t (*format)(const struct net_device *, char *))
45{
46 struct net_device *net = to_net_dev(dev);
47 ssize_t ret = -EINVAL;
48
49 read_lock(&dev_base_lock);
50 if (dev_isalive(net))
51 ret = (*format)(net, buf);
52 read_unlock(&dev_base_lock);
53
54 return ret;
55}
56
57
58#define NETDEVICE_SHOW(field, format_string) \
59static ssize_t format_##field(const struct net_device *net, char *buf) \
60{ \
61 return sprintf(buf, format_string, net->field); \
62} \
63static ssize_t show_##field(struct device *dev, \
64 struct device_attribute *attr, char *buf) \
65{ \
66 return netdev_show(dev, attr, buf, format_##field); \
67}
68
69
70
71static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
72 const char *buf, size_t len,
73 int (*set)(struct net_device *, unsigned long))
74{
75 struct net_device *net = to_net_dev(dev);
76 char *endp;
77 unsigned long new;
78 int ret = -EINVAL;
79
80 if (!capable(CAP_NET_ADMIN))
81 return -EPERM;
82
83 new = simple_strtoul(buf, &endp, 0);
84 if (endp == buf)
85 goto err;
86
87 if (!rtnl_trylock())
88 return restart_syscall();
89
90 if (dev_isalive(net)) {
91 if ((ret = (*set)(net, new)) == 0)
92 ret = len;
93 }
94 rtnl_unlock();
95 err:
96 return ret;
97}
98
99NETDEVICE_SHOW(dev_id, fmt_hex);
100NETDEVICE_SHOW(addr_assign_type, fmt_dec);
101NETDEVICE_SHOW(addr_len, fmt_dec);
102NETDEVICE_SHOW(iflink, fmt_dec);
103NETDEVICE_SHOW(ifindex, fmt_dec);
104NETDEVICE_SHOW(type, fmt_dec);
105NETDEVICE_SHOW(link_mode, fmt_dec);
106
107
108static ssize_t show_address(struct device *dev, struct device_attribute *attr,
109 char *buf)
110{
111 struct net_device *net = to_net_dev(dev);
112 ssize_t ret = -EINVAL;
113
114 read_lock(&dev_base_lock);
115 if (dev_isalive(net))
116 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
117 read_unlock(&dev_base_lock);
118 return ret;
119}
120
121static ssize_t show_broadcast(struct device *dev,
122 struct device_attribute *attr, char *buf)
123{
124 struct net_device *net = to_net_dev(dev);
125 if (dev_isalive(net))
126 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
127 return -EINVAL;
128}
129
130static ssize_t show_carrier(struct device *dev,
131 struct device_attribute *attr, char *buf)
132{
133 struct net_device *netdev = to_net_dev(dev);
134 if (netif_running(netdev)) {
135 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
136 }
137 return -EINVAL;
138}
139
140static ssize_t show_speed(struct device *dev,
141 struct device_attribute *attr, char *buf)
142{
143 struct net_device *netdev = to_net_dev(dev);
144 int ret = -EINVAL;
145
146 if (!rtnl_trylock())
147 return restart_syscall();
148
149 if (netif_running(netdev)) {
150 struct ethtool_cmd cmd;
151 if (!__ethtool_get_settings(netdev, &cmd))
152 ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
153 }
154 rtnl_unlock();
155 return ret;
156}
157
158static ssize_t show_duplex(struct device *dev,
159 struct device_attribute *attr, char *buf)
160{
161 struct net_device *netdev = to_net_dev(dev);
162 int ret = -EINVAL;
163
164 if (!rtnl_trylock())
165 return restart_syscall();
166
167 if (netif_running(netdev)) {
168 struct ethtool_cmd cmd;
169 if (!__ethtool_get_settings(netdev, &cmd))
170 ret = sprintf(buf, "%s\n",
171 cmd.duplex ? "full" : "half");
172 }
173 rtnl_unlock();
174 return ret;
175}
176
177static ssize_t show_dormant(struct device *dev,
178 struct device_attribute *attr, char *buf)
179{
180 struct net_device *netdev = to_net_dev(dev);
181
182 if (netif_running(netdev))
183 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
184
185 return -EINVAL;
186}
187
188static const char *const operstates[] = {
189 "unknown",
190 "notpresent",
191 "down",
192 "lowerlayerdown",
193 "testing",
194 "dormant",
195 "up"
196};
197
198static ssize_t show_operstate(struct device *dev,
199 struct device_attribute *attr, char *buf)
200{
201 const struct net_device *netdev = to_net_dev(dev);
202 unsigned char operstate;
203
204 read_lock(&dev_base_lock);
205 operstate = netdev->operstate;
206 if (!netif_running(netdev))
207 operstate = IF_OPER_DOWN;
208 read_unlock(&dev_base_lock);
209
210 if (operstate >= ARRAY_SIZE(operstates))
211 return -EINVAL;
212
213 return sprintf(buf, "%s\n", operstates[operstate]);
214}
215
216
217NETDEVICE_SHOW(mtu, fmt_dec);
218
219static int change_mtu(struct net_device *net, unsigned long new_mtu)
220{
221 return dev_set_mtu(net, (int) new_mtu);
222}
223
224static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
225 const char *buf, size_t len)
226{
227 return netdev_store(dev, attr, buf, len, change_mtu);
228}
229
230NETDEVICE_SHOW(flags, fmt_hex);
231
232static int change_flags(struct net_device *net, unsigned long new_flags)
233{
234 return dev_change_flags(net, (unsigned) new_flags);
235}
236
237static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
238 const char *buf, size_t len)
239{
240 return netdev_store(dev, attr, buf, len, change_flags);
241}
242
243NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
244
245static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
246{
247 net->tx_queue_len = new_len;
248 return 0;
249}
250
251static ssize_t store_tx_queue_len(struct device *dev,
252 struct device_attribute *attr,
253 const char *buf, size_t len)
254{
255 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
256}
257
258static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
259 const char *buf, size_t len)
260{
261 struct net_device *netdev = to_net_dev(dev);
262 size_t count = len;
263 ssize_t ret;
264
265 if (!capable(CAP_NET_ADMIN))
266 return -EPERM;
267
268
269 if (len > 0 && buf[len - 1] == '\n')
270 --count;
271
272 if (!rtnl_trylock())
273 return restart_syscall();
274 ret = dev_set_alias(netdev, buf, count);
275 rtnl_unlock();
276
277 return ret < 0 ? ret : len;
278}
279
280static ssize_t show_ifalias(struct device *dev,
281 struct device_attribute *attr, char *buf)
282{
283 const struct net_device *netdev = to_net_dev(dev);
284 ssize_t ret = 0;
285
286 if (!rtnl_trylock())
287 return restart_syscall();
288 if (netdev->ifalias)
289 ret = sprintf(buf, "%s\n", netdev->ifalias);
290 rtnl_unlock();
291 return ret;
292}
293
294NETDEVICE_SHOW(group, fmt_dec);
295
296static int change_group(struct net_device *net, unsigned long new_group)
297{
298 dev_set_group(net, (int) new_group);
299 return 0;
300}
301
302static ssize_t store_group(struct device *dev, struct device_attribute *attr,
303 const char *buf, size_t len)
304{
305 return netdev_store(dev, attr, buf, len, change_group);
306}
307
308static struct device_attribute net_class_attributes[] = {
309 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
310 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
311 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
312 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
313 __ATTR(iflink, S_IRUGO, show_iflink, NULL),
314 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
315 __ATTR(type, S_IRUGO, show_type, NULL),
316 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
317 __ATTR(address, S_IRUGO, show_address, NULL),
318 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
319 __ATTR(carrier, S_IRUGO, show_carrier, NULL),
320 __ATTR(speed, S_IRUGO, show_speed, NULL),
321 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
322 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
323 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
324 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
325 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
326 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
327 store_tx_queue_len),
328 __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
329 {}
330};
331
332
333static ssize_t netstat_show(const struct device *d,
334 struct device_attribute *attr, char *buf,
335 unsigned long offset)
336{
337 struct net_device *dev = to_net_dev(d);
338 ssize_t ret = -EINVAL;
339
340 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
341 offset % sizeof(u64) != 0);
342
343 read_lock(&dev_base_lock);
344 if (dev_isalive(dev)) {
345 struct rtnl_link_stats64 temp;
346 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
347
348 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
349 }
350 read_unlock(&dev_base_lock);
351 return ret;
352}
353
354
355#define NETSTAT_ENTRY(name) \
356static ssize_t show_##name(struct device *d, \
357 struct device_attribute *attr, char *buf) \
358{ \
359 return netstat_show(d, attr, buf, \
360 offsetof(struct rtnl_link_stats64, name)); \
361} \
362static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
363
364NETSTAT_ENTRY(rx_packets);
365NETSTAT_ENTRY(tx_packets);
366NETSTAT_ENTRY(rx_bytes);
367NETSTAT_ENTRY(tx_bytes);
368NETSTAT_ENTRY(rx_errors);
369NETSTAT_ENTRY(tx_errors);
370NETSTAT_ENTRY(rx_dropped);
371NETSTAT_ENTRY(tx_dropped);
372NETSTAT_ENTRY(multicast);
373NETSTAT_ENTRY(collisions);
374NETSTAT_ENTRY(rx_length_errors);
375NETSTAT_ENTRY(rx_over_errors);
376NETSTAT_ENTRY(rx_crc_errors);
377NETSTAT_ENTRY(rx_frame_errors);
378NETSTAT_ENTRY(rx_fifo_errors);
379NETSTAT_ENTRY(rx_missed_errors);
380NETSTAT_ENTRY(tx_aborted_errors);
381NETSTAT_ENTRY(tx_carrier_errors);
382NETSTAT_ENTRY(tx_fifo_errors);
383NETSTAT_ENTRY(tx_heartbeat_errors);
384NETSTAT_ENTRY(tx_window_errors);
385NETSTAT_ENTRY(rx_compressed);
386NETSTAT_ENTRY(tx_compressed);
387
388static struct attribute *netstat_attrs[] = {
389 &dev_attr_rx_packets.attr,
390 &dev_attr_tx_packets.attr,
391 &dev_attr_rx_bytes.attr,
392 &dev_attr_tx_bytes.attr,
393 &dev_attr_rx_errors.attr,
394 &dev_attr_tx_errors.attr,
395 &dev_attr_rx_dropped.attr,
396 &dev_attr_tx_dropped.attr,
397 &dev_attr_multicast.attr,
398 &dev_attr_collisions.attr,
399 &dev_attr_rx_length_errors.attr,
400 &dev_attr_rx_over_errors.attr,
401 &dev_attr_rx_crc_errors.attr,
402 &dev_attr_rx_frame_errors.attr,
403 &dev_attr_rx_fifo_errors.attr,
404 &dev_attr_rx_missed_errors.attr,
405 &dev_attr_tx_aborted_errors.attr,
406 &dev_attr_tx_carrier_errors.attr,
407 &dev_attr_tx_fifo_errors.attr,
408 &dev_attr_tx_heartbeat_errors.attr,
409 &dev_attr_tx_window_errors.attr,
410 &dev_attr_rx_compressed.attr,
411 &dev_attr_tx_compressed.attr,
412 NULL
413};
414
415
416static struct attribute_group netstat_group = {
417 .name = "statistics",
418 .attrs = netstat_attrs,
419};
420
421#ifdef CONFIG_WIRELESS_EXT_SYSFS
422
423static ssize_t wireless_show(struct device *d, char *buf,
424 ssize_t (*format)(const struct iw_statistics *,
425 char *))
426{
427 struct net_device *dev = to_net_dev(d);
428 const struct iw_statistics *iw;
429 ssize_t ret = -EINVAL;
430
431 if (!rtnl_trylock())
432 return restart_syscall();
433 if (dev_isalive(dev)) {
434 iw = get_wireless_stats(dev);
435 if (iw)
436 ret = (*format)(iw, buf);
437 }
438 rtnl_unlock();
439
440 return ret;
441}
442
443
444#define WIRELESS_SHOW(name, field, format_string) \
445static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
446{ \
447 return sprintf(buf, format_string, iw->field); \
448} \
449static ssize_t show_iw_##name(struct device *d, \
450 struct device_attribute *attr, char *buf) \
451{ \
452 return wireless_show(d, buf, format_iw_##name); \
453} \
454static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
455
456WIRELESS_SHOW(status, status, fmt_hex);
457WIRELESS_SHOW(link, qual.qual, fmt_dec);
458WIRELESS_SHOW(level, qual.level, fmt_dec);
459WIRELESS_SHOW(noise, qual.noise, fmt_dec);
460WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
461WIRELESS_SHOW(crypt, discard.code, fmt_dec);
462WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
463WIRELESS_SHOW(misc, discard.misc, fmt_dec);
464WIRELESS_SHOW(retries, discard.retries, fmt_dec);
465WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
466
467static struct attribute *wireless_attrs[] = {
468 &dev_attr_status.attr,
469 &dev_attr_link.attr,
470 &dev_attr_level.attr,
471 &dev_attr_noise.attr,
472 &dev_attr_nwid.attr,
473 &dev_attr_crypt.attr,
474 &dev_attr_fragment.attr,
475 &dev_attr_retries.attr,
476 &dev_attr_misc.attr,
477 &dev_attr_beacon.attr,
478 NULL
479};
480
481static struct attribute_group wireless_group = {
482 .name = "wireless",
483 .attrs = wireless_attrs,
484};
485#endif
486#endif
487
488#ifdef CONFIG_RPS
489
490
491
492struct rx_queue_attribute {
493 struct attribute attr;
494 ssize_t (*show)(struct netdev_rx_queue *queue,
495 struct rx_queue_attribute *attr, char *buf);
496 ssize_t (*store)(struct netdev_rx_queue *queue,
497 struct rx_queue_attribute *attr, const char *buf, size_t len);
498};
499#define to_rx_queue_attr(_attr) container_of(_attr, \
500 struct rx_queue_attribute, attr)
501
502#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
503
504static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
505 char *buf)
506{
507 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
508 struct netdev_rx_queue *queue = to_rx_queue(kobj);
509
510 if (!attribute->show)
511 return -EIO;
512
513 return attribute->show(queue, attribute, buf);
514}
515
516static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
517 const char *buf, size_t count)
518{
519 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
520 struct netdev_rx_queue *queue = to_rx_queue(kobj);
521
522 if (!attribute->store)
523 return -EIO;
524
525 return attribute->store(queue, attribute, buf, count);
526}
527
528static const struct sysfs_ops rx_queue_sysfs_ops = {
529 .show = rx_queue_attr_show,
530 .store = rx_queue_attr_store,
531};
532
533static ssize_t show_rps_map(struct netdev_rx_queue *queue,
534 struct rx_queue_attribute *attribute, char *buf)
535{
536 struct rps_map *map;
537 cpumask_var_t mask;
538 size_t len = 0;
539 int i;
540
541 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
542 return -ENOMEM;
543
544 rcu_read_lock();
545 map = rcu_dereference(queue->rps_map);
546 if (map)
547 for (i = 0; i < map->len; i++)
548 cpumask_set_cpu(map->cpus[i], mask);
549
550 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
551 if (PAGE_SIZE - len < 3) {
552 rcu_read_unlock();
553 free_cpumask_var(mask);
554 return -EINVAL;
555 }
556 rcu_read_unlock();
557
558 free_cpumask_var(mask);
559 len += sprintf(buf + len, "\n");
560 return len;
561}
562
563static ssize_t store_rps_map(struct netdev_rx_queue *queue,
564 struct rx_queue_attribute *attribute,
565 const char *buf, size_t len)
566{
567 struct rps_map *old_map, *map;
568 cpumask_var_t mask;
569 int err, cpu, i;
570 static DEFINE_SPINLOCK(rps_map_lock);
571
572 if (!capable(CAP_NET_ADMIN))
573 return -EPERM;
574
575 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
576 return -ENOMEM;
577
578 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
579 if (err) {
580 free_cpumask_var(mask);
581 return err;
582 }
583
584 map = kzalloc(max_t(unsigned,
585 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
586 GFP_KERNEL);
587 if (!map) {
588 free_cpumask_var(mask);
589 return -ENOMEM;
590 }
591
592 i = 0;
593 for_each_cpu_and(cpu, mask, cpu_online_mask)
594 map->cpus[i++] = cpu;
595
596 if (i)
597 map->len = i;
598 else {
599 kfree(map);
600 map = NULL;
601 }
602
603 spin_lock(&rps_map_lock);
604 old_map = rcu_dereference_protected(queue->rps_map,
605 lockdep_is_held(&rps_map_lock));
606 rcu_assign_pointer(queue->rps_map, map);
607 spin_unlock(&rps_map_lock);
608
609 if (old_map)
610 kfree_rcu(old_map, rcu);
611
612 free_cpumask_var(mask);
613 return len;
614}
615
616static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
617 struct rx_queue_attribute *attr,
618 char *buf)
619{
620 struct rps_dev_flow_table *flow_table;
621 unsigned int val = 0;
622
623 rcu_read_lock();
624 flow_table = rcu_dereference(queue->rps_flow_table);
625 if (flow_table)
626 val = flow_table->mask + 1;
627 rcu_read_unlock();
628
629 return sprintf(buf, "%u\n", val);
630}
631
632static void rps_dev_flow_table_release_work(struct work_struct *work)
633{
634 struct rps_dev_flow_table *table = container_of(work,
635 struct rps_dev_flow_table, free_work);
636
637 vfree(table);
638}
639
640static void rps_dev_flow_table_release(struct rcu_head *rcu)
641{
642 struct rps_dev_flow_table *table = container_of(rcu,
643 struct rps_dev_flow_table, rcu);
644
645 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
646 schedule_work(&table->free_work);
647}
648
649static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
650 struct rx_queue_attribute *attr,
651 const char *buf, size_t len)
652{
653 unsigned int count;
654 char *endp;
655 struct rps_dev_flow_table *table, *old_table;
656 static DEFINE_SPINLOCK(rps_dev_flow_lock);
657
658 if (!capable(CAP_NET_ADMIN))
659 return -EPERM;
660
661 count = simple_strtoul(buf, &endp, 0);
662 if (endp == buf)
663 return -EINVAL;
664
665 if (count) {
666 int i;
667
668 if (count > INT_MAX)
669 return -EINVAL;
670 count = roundup_pow_of_two(count);
671 if (count > (ULONG_MAX - sizeof(struct rps_dev_flow_table))
672 / sizeof(struct rps_dev_flow)) {
673
674 return -EINVAL;
675 }
676 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
677 if (!table)
678 return -ENOMEM;
679
680 table->mask = count - 1;
681 for (i = 0; i < count; i++)
682 table->flows[i].cpu = RPS_NO_CPU;
683 } else
684 table = NULL;
685
686 spin_lock(&rps_dev_flow_lock);
687 old_table = rcu_dereference_protected(queue->rps_flow_table,
688 lockdep_is_held(&rps_dev_flow_lock));
689 rcu_assign_pointer(queue->rps_flow_table, table);
690 spin_unlock(&rps_dev_flow_lock);
691
692 if (old_table)
693 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
694
695 return len;
696}
697
698static struct rx_queue_attribute rps_cpus_attribute =
699 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
700
701
702static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
703 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
704 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
705
706static struct attribute *rx_queue_default_attrs[] = {
707 &rps_cpus_attribute.attr,
708 &rps_dev_flow_table_cnt_attribute.attr,
709 NULL
710};
711
712static void rx_queue_release(struct kobject *kobj)
713{
714 struct netdev_rx_queue *queue = to_rx_queue(kobj);
715 struct rps_map *map;
716 struct rps_dev_flow_table *flow_table;
717
718
719 map = rcu_dereference_protected(queue->rps_map, 1);
720 if (map) {
721 RCU_INIT_POINTER(queue->rps_map, NULL);
722 kfree_rcu(map, rcu);
723 }
724
725 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
726 if (flow_table) {
727 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
728 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
729 }
730
731 memset(kobj, 0, sizeof(*kobj));
732 dev_put(queue->dev);
733}
734
735static struct kobj_type rx_queue_ktype = {
736 .sysfs_ops = &rx_queue_sysfs_ops,
737 .release = rx_queue_release,
738 .default_attrs = rx_queue_default_attrs,
739};
740
741static int rx_queue_add_kobject(struct net_device *net, int index)
742{
743 struct netdev_rx_queue *queue = net->_rx + index;
744 struct kobject *kobj = &queue->kobj;
745 int error = 0;
746
747 kobj->kset = net->queues_kset;
748 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
749 "rx-%u", index);
750 if (error) {
751 kobject_put(kobj);
752 return error;
753 }
754
755 kobject_uevent(kobj, KOBJ_ADD);
756 dev_hold(queue->dev);
757
758 return error;
759}
760#endif
761
762int
763net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
764{
765#ifdef CONFIG_RPS
766 int i;
767 int error = 0;
768
769 for (i = old_num; i < new_num; i++) {
770 error = rx_queue_add_kobject(net, i);
771 if (error) {
772 new_num = old_num;
773 break;
774 }
775 }
776
777 while (--i >= new_num)
778 kobject_put(&net->_rx[i].kobj);
779
780 return error;
781#else
782 return 0;
783#endif
784}
785
786#ifdef CONFIG_XPS
787
788
789
790struct netdev_queue_attribute {
791 struct attribute attr;
792 ssize_t (*show)(struct netdev_queue *queue,
793 struct netdev_queue_attribute *attr, char *buf);
794 ssize_t (*store)(struct netdev_queue *queue,
795 struct netdev_queue_attribute *attr, const char *buf, size_t len);
796};
797#define to_netdev_queue_attr(_attr) container_of(_attr, \
798 struct netdev_queue_attribute, attr)
799
800#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
801
802static ssize_t netdev_queue_attr_show(struct kobject *kobj,
803 struct attribute *attr, char *buf)
804{
805 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
806 struct netdev_queue *queue = to_netdev_queue(kobj);
807
808 if (!attribute->show)
809 return -EIO;
810
811 return attribute->show(queue, attribute, buf);
812}
813
814static ssize_t netdev_queue_attr_store(struct kobject *kobj,
815 struct attribute *attr,
816 const char *buf, size_t count)
817{
818 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
819 struct netdev_queue *queue = to_netdev_queue(kobj);
820
821 if (!attribute->store)
822 return -EIO;
823
824 return attribute->store(queue, attribute, buf, count);
825}
826
827static const struct sysfs_ops netdev_queue_sysfs_ops = {
828 .show = netdev_queue_attr_show,
829 .store = netdev_queue_attr_store,
830};
831
832static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
833{
834 struct net_device *dev = queue->dev;
835 int i;
836
837 for (i = 0; i < dev->num_tx_queues; i++)
838 if (queue == &dev->_tx[i])
839 break;
840
841 BUG_ON(i >= dev->num_tx_queues);
842
843 return i;
844}
845
846
847static ssize_t show_xps_map(struct netdev_queue *queue,
848 struct netdev_queue_attribute *attribute, char *buf)
849{
850 struct net_device *dev = queue->dev;
851 struct xps_dev_maps *dev_maps;
852 cpumask_var_t mask;
853 unsigned long index;
854 size_t len = 0;
855 int i;
856
857 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
858 return -ENOMEM;
859
860 index = get_netdev_queue_index(queue);
861
862 rcu_read_lock();
863 dev_maps = rcu_dereference(dev->xps_maps);
864 if (dev_maps) {
865 for_each_possible_cpu(i) {
866 struct xps_map *map =
867 rcu_dereference(dev_maps->cpu_map[i]);
868 if (map) {
869 int j;
870 for (j = 0; j < map->len; j++) {
871 if (map->queues[j] == index) {
872 cpumask_set_cpu(i, mask);
873 break;
874 }
875 }
876 }
877 }
878 }
879 rcu_read_unlock();
880
881 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
882 if (PAGE_SIZE - len < 3) {
883 free_cpumask_var(mask);
884 return -EINVAL;
885 }
886
887 free_cpumask_var(mask);
888 len += sprintf(buf + len, "\n");
889 return len;
890}
891
892static DEFINE_MUTEX(xps_map_mutex);
893#define xmap_dereference(P) \
894 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
895
896static ssize_t store_xps_map(struct netdev_queue *queue,
897 struct netdev_queue_attribute *attribute,
898 const char *buf, size_t len)
899{
900 struct net_device *dev = queue->dev;
901 cpumask_var_t mask;
902 int err, i, cpu, pos, map_len, alloc_len, need_set;
903 unsigned long index;
904 struct xps_map *map, *new_map;
905 struct xps_dev_maps *dev_maps, *new_dev_maps;
906 int nonempty = 0;
907 int numa_node = -2;
908
909 if (!capable(CAP_NET_ADMIN))
910 return -EPERM;
911
912 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
913 return -ENOMEM;
914
915 index = get_netdev_queue_index(queue);
916
917 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
918 if (err) {
919 free_cpumask_var(mask);
920 return err;
921 }
922
923 new_dev_maps = kzalloc(max_t(unsigned,
924 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
925 if (!new_dev_maps) {
926 free_cpumask_var(mask);
927 return -ENOMEM;
928 }
929
930 mutex_lock(&xps_map_mutex);
931
932 dev_maps = xmap_dereference(dev->xps_maps);
933
934 for_each_possible_cpu(cpu) {
935 map = dev_maps ?
936 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
937 new_map = map;
938 if (map) {
939 for (pos = 0; pos < map->len; pos++)
940 if (map->queues[pos] == index)
941 break;
942 map_len = map->len;
943 alloc_len = map->alloc_len;
944 } else
945 pos = map_len = alloc_len = 0;
946
947 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
948#ifdef CONFIG_NUMA
949 if (need_set) {
950 if (numa_node == -2)
951 numa_node = cpu_to_node(cpu);
952 else if (numa_node != cpu_to_node(cpu))
953 numa_node = -1;
954 }
955#endif
956 if (need_set && pos >= map_len) {
957
958 if (map_len >= alloc_len) {
959 alloc_len = alloc_len ?
960 2 * alloc_len : XPS_MIN_MAP_ALLOC;
961 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
962 GFP_KERNEL,
963 cpu_to_node(cpu));
964 if (!new_map)
965 goto error;
966 new_map->alloc_len = alloc_len;
967 for (i = 0; i < map_len; i++)
968 new_map->queues[i] = map->queues[i];
969 new_map->len = map_len;
970 }
971 new_map->queues[new_map->len++] = index;
972 } else if (!need_set && pos < map_len) {
973
974 if (map_len > 1)
975 new_map->queues[pos] =
976 new_map->queues[--new_map->len];
977 else
978 new_map = NULL;
979 }
980 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
981 }
982
983
984 for_each_possible_cpu(cpu) {
985 map = dev_maps ?
986 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
987 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
988 kfree_rcu(map, rcu);
989 if (new_dev_maps->cpu_map[cpu])
990 nonempty = 1;
991 }
992
993 if (nonempty)
994 RCU_INIT_POINTER(dev->xps_maps, new_dev_maps);
995 else {
996 kfree(new_dev_maps);
997 RCU_INIT_POINTER(dev->xps_maps, NULL);
998 }
999
1000 if (dev_maps)
1001 kfree_rcu(dev_maps, rcu);
1002
1003 netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1004 NUMA_NO_NODE);
1005
1006 mutex_unlock(&xps_map_mutex);
1007
1008 free_cpumask_var(mask);
1009 return len;
1010
1011error:
1012 mutex_unlock(&xps_map_mutex);
1013
1014 if (new_dev_maps)
1015 for_each_possible_cpu(i)
1016 kfree(rcu_dereference_protected(
1017 new_dev_maps->cpu_map[i],
1018 1));
1019 kfree(new_dev_maps);
1020 free_cpumask_var(mask);
1021 return -ENOMEM;
1022}
1023
1024static struct netdev_queue_attribute xps_cpus_attribute =
1025 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1026
1027static struct attribute *netdev_queue_default_attrs[] = {
1028 &xps_cpus_attribute.attr,
1029 NULL
1030};
1031
1032static void netdev_queue_release(struct kobject *kobj)
1033{
1034 struct netdev_queue *queue = to_netdev_queue(kobj);
1035 struct net_device *dev = queue->dev;
1036 struct xps_dev_maps *dev_maps;
1037 struct xps_map *map;
1038 unsigned long index;
1039 int i, pos, nonempty = 0;
1040
1041 index = get_netdev_queue_index(queue);
1042
1043 mutex_lock(&xps_map_mutex);
1044 dev_maps = xmap_dereference(dev->xps_maps);
1045
1046 if (dev_maps) {
1047 for_each_possible_cpu(i) {
1048 map = xmap_dereference(dev_maps->cpu_map[i]);
1049 if (!map)
1050 continue;
1051
1052 for (pos = 0; pos < map->len; pos++)
1053 if (map->queues[pos] == index)
1054 break;
1055
1056 if (pos < map->len) {
1057 if (map->len > 1)
1058 map->queues[pos] =
1059 map->queues[--map->len];
1060 else {
1061 RCU_INIT_POINTER(dev_maps->cpu_map[i],
1062 NULL);
1063 kfree_rcu(map, rcu);
1064 map = NULL;
1065 }
1066 }
1067 if (map)
1068 nonempty = 1;
1069 }
1070
1071 if (!nonempty) {
1072 RCU_INIT_POINTER(dev->xps_maps, NULL);
1073 kfree_rcu(dev_maps, rcu);
1074 }
1075 }
1076
1077 mutex_unlock(&xps_map_mutex);
1078
1079 memset(kobj, 0, sizeof(*kobj));
1080 dev_put(queue->dev);
1081}
1082
1083static struct kobj_type netdev_queue_ktype = {
1084 .sysfs_ops = &netdev_queue_sysfs_ops,
1085 .release = netdev_queue_release,
1086 .default_attrs = netdev_queue_default_attrs,
1087};
1088
1089static int netdev_queue_add_kobject(struct net_device *net, int index)
1090{
1091 struct netdev_queue *queue = net->_tx + index;
1092 struct kobject *kobj = &queue->kobj;
1093 int error = 0;
1094
1095 kobj->kset = net->queues_kset;
1096 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1097 "tx-%u", index);
1098 if (error) {
1099 kobject_put(kobj);
1100 return error;
1101 }
1102
1103 kobject_uevent(kobj, KOBJ_ADD);
1104 dev_hold(queue->dev);
1105
1106 return error;
1107}
1108#endif
1109
1110int
1111netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1112{
1113#ifdef CONFIG_XPS
1114 int i;
1115 int error = 0;
1116
1117 for (i = old_num; i < new_num; i++) {
1118 error = netdev_queue_add_kobject(net, i);
1119 if (error) {
1120 new_num = old_num;
1121 break;
1122 }
1123 }
1124
1125 while (--i >= new_num)
1126 kobject_put(&net->_tx[i].kobj);
1127
1128 return error;
1129#else
1130 return 0;
1131#endif
1132}
1133
1134static int register_queue_kobjects(struct net_device *net)
1135{
1136 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1137
1138#if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1139 net->queues_kset = kset_create_and_add("queues",
1140 NULL, &net->dev.kobj);
1141 if (!net->queues_kset)
1142 return -ENOMEM;
1143#endif
1144
1145#ifdef CONFIG_RPS
1146 real_rx = net->real_num_rx_queues;
1147#endif
1148 real_tx = net->real_num_tx_queues;
1149
1150 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1151 if (error)
1152 goto error;
1153 rxq = real_rx;
1154
1155 error = netdev_queue_update_kobjects(net, 0, real_tx);
1156 if (error)
1157 goto error;
1158 txq = real_tx;
1159
1160 return 0;
1161
1162error:
1163 netdev_queue_update_kobjects(net, txq, 0);
1164 net_rx_queue_update_kobjects(net, rxq, 0);
1165 return error;
1166}
1167
1168static void remove_queue_kobjects(struct net_device *net)
1169{
1170 int real_rx = 0, real_tx = 0;
1171
1172#ifdef CONFIG_RPS
1173 real_rx = net->real_num_rx_queues;
1174#endif
1175 real_tx = net->real_num_tx_queues;
1176
1177 net_rx_queue_update_kobjects(net, real_rx, 0);
1178 netdev_queue_update_kobjects(net, real_tx, 0);
1179#if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1180 kset_unregister(net->queues_kset);
1181#endif
1182}
1183
1184static void *net_grab_current_ns(void)
1185{
1186 struct net *ns = current->nsproxy->net_ns;
1187#ifdef CONFIG_NET_NS
1188 if (ns)
1189 atomic_inc(&ns->passive);
1190#endif
1191 return ns;
1192}
1193
1194static const void *net_initial_ns(void)
1195{
1196 return &init_net;
1197}
1198
1199static const void *net_netlink_ns(struct sock *sk)
1200{
1201 return sock_net(sk);
1202}
1203
1204struct kobj_ns_type_operations net_ns_type_operations = {
1205 .type = KOBJ_NS_TYPE_NET,
1206 .grab_current_ns = net_grab_current_ns,
1207 .netlink_ns = net_netlink_ns,
1208 .initial_ns = net_initial_ns,
1209 .drop_ns = net_drop_ns,
1210};
1211EXPORT_SYMBOL_GPL(net_ns_type_operations);
1212
1213#ifdef CONFIG_HOTPLUG
1214static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1215{
1216 struct net_device *dev = to_net_dev(d);
1217 int retval;
1218
1219
1220 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1221 if (retval)
1222 goto exit;
1223
1224
1225
1226
1227 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1228
1229exit:
1230 return retval;
1231}
1232#endif
1233
1234
1235
1236
1237
1238static void netdev_release(struct device *d)
1239{
1240 struct net_device *dev = to_net_dev(d);
1241
1242 BUG_ON(dev->reg_state != NETREG_RELEASED);
1243
1244 kfree(dev->ifalias);
1245 kfree((char *)dev - dev->padded);
1246}
1247
1248static const void *net_namespace(struct device *d)
1249{
1250 struct net_device *dev;
1251 dev = container_of(d, struct net_device, dev);
1252 return dev_net(dev);
1253}
1254
1255static struct class net_class = {
1256 .name = "net",
1257 .dev_release = netdev_release,
1258#ifdef CONFIG_SYSFS
1259 .dev_attrs = net_class_attributes,
1260#endif
1261#ifdef CONFIG_HOTPLUG
1262 .dev_uevent = netdev_uevent,
1263#endif
1264 .ns_type = &net_ns_type_operations,
1265 .namespace = net_namespace,
1266};
1267
1268
1269
1270
1271void netdev_unregister_kobject(struct net_device * net)
1272{
1273 struct device *dev = &(net->dev);
1274
1275 kobject_get(&dev->kobj);
1276
1277 remove_queue_kobjects(net);
1278
1279 device_del(dev);
1280}
1281
1282
1283int netdev_register_kobject(struct net_device *net)
1284{
1285 struct device *dev = &(net->dev);
1286 const struct attribute_group **groups = net->sysfs_groups;
1287 int error = 0;
1288
1289 device_initialize(dev);
1290 dev->class = &net_class;
1291 dev->platform_data = net;
1292 dev->groups = groups;
1293
1294 dev_set_name(dev, "%s", net->name);
1295
1296#ifdef CONFIG_SYSFS
1297
1298 if (*groups)
1299 groups++;
1300
1301 *groups++ = &netstat_group;
1302#ifdef CONFIG_WIRELESS_EXT_SYSFS
1303 if (net->ieee80211_ptr)
1304 *groups++ = &wireless_group;
1305#ifdef CONFIG_WIRELESS_EXT
1306 else if (net->wireless_handlers)
1307 *groups++ = &wireless_group;
1308#endif
1309#endif
1310#endif
1311
1312 error = device_add(dev);
1313 if (error)
1314 return error;
1315
1316 error = register_queue_kobjects(net);
1317 if (error) {
1318 device_del(dev);
1319 return error;
1320 }
1321
1322 return error;
1323}
1324
1325int netdev_class_create_file(struct class_attribute *class_attr)
1326{
1327 return class_create_file(&net_class, class_attr);
1328}
1329EXPORT_SYMBOL(netdev_class_create_file);
1330
1331void netdev_class_remove_file(struct class_attribute *class_attr)
1332{
1333 class_remove_file(&net_class, class_attr);
1334}
1335EXPORT_SYMBOL(netdev_class_remove_file);
1336
1337int netdev_kobject_init(void)
1338{
1339 kobj_ns_type_register(&net_ns_type_operations);
1340 return class_register(&net_class);
1341}
1342
