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