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TOMOYO Linux Cross Reference
Linux/net/core/net-sysfs.c

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

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