2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <net/net_namespace.h>
99 #include <linux/rtnetlink.h>
100 #include <linux/proc_fs.h>
101 #include <linux/seq_file.h>
102 #include <linux/stat.h>
104 #include <net/pkt_sched.h>
105 #include <net/checksum.h>
106 #include <net/xfrm.h>
107 #include <linux/highmem.h>
108 #include <linux/init.h>
109 #include <linux/kmod.h>
110 #include <linux/module.h>
111 #include <linux/netpoll.h>
112 #include <linux/rcupdate.h>
113 #include <linux/delay.h>
114 #include <net/wext.h>
115 #include <net/iw_handler.h>
116 #include <asm/current.h>
117 #include <linux/audit.h>
118 #include <linux/dmaengine.h>
119 #include <linux/err.h>
120 #include <linux/ctype.h>
121 #include <linux/if_arp.h>
122 #include <linux/if_vlan.h>
123 #include <linux/ip.h>
125 #include <linux/ipv6.h>
126 #include <linux/in.h>
127 #include <linux/jhash.h>
128 #include <linux/random.h>
129 #include <trace/events/napi.h>
130 #include <trace/events/net.h>
131 #include <trace/events/skb.h>
132 #include <linux/pci.h>
133 #include <linux/inetdevice.h>
134 #include <linux/cpu_rmap.h>
135 #include <linux/net_tstamp.h>
136 #include <linux/static_key.h>
137 #include <net/flow_keys.h>
139 #include "net-sysfs.h"
141 /* Instead of increasing this, you should create a hash table. */
142 #define MAX_GRO_SKBS 8
144 /* This should be increased if a protocol with a bigger head is added. */
145 #define GRO_MAX_HEAD (MAX_HEADER + 128)
148 * The list of packet types we will receive (as opposed to discard)
149 * and the routines to invoke.
151 * Why 16. Because with 16 the only overlap we get on a hash of the
152 * low nibble of the protocol value is RARP/SNAP/X.25.
154 * NOTE: That is no longer true with the addition of VLAN tags. Not
155 * sure which should go first, but I bet it won't make much
156 * difference if we are running VLANs. The good news is that
157 * this protocol won't be in the list unless compiled in, so
158 * the average user (w/out VLANs) will not be adversely affected.
175 #define PTYPE_HASH_SIZE (16)
176 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
178 static DEFINE_SPINLOCK(ptype_lock);
179 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
180 static struct list_head ptype_all __read_mostly; /* Taps */
183 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
186 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
188 * Writers must hold the rtnl semaphore while they loop through the
189 * dev_base_head list, and hold dev_base_lock for writing when they do the
190 * actual updates. This allows pure readers to access the list even
191 * while a writer is preparing to update it.
193 * To put it another way, dev_base_lock is held for writing only to
194 * protect against pure readers; the rtnl semaphore provides the
195 * protection against other writers.
197 * See, for example usages, register_netdevice() and
198 * unregister_netdevice(), which must be called with the rtnl
201 DEFINE_RWLOCK(dev_base_lock);
202 EXPORT_SYMBOL(dev_base_lock);
204 static inline void dev_base_seq_inc(struct net *net)
206 while (++net->dev_base_seq == 0);
209 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
211 unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
213 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
216 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
218 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
221 static inline void rps_lock(struct softnet_data *sd)
224 spin_lock(&sd->input_pkt_queue.lock);
228 static inline void rps_unlock(struct softnet_data *sd)
231 spin_unlock(&sd->input_pkt_queue.lock);
235 /* Device list insertion */
236 static int list_netdevice(struct net_device *dev)
238 struct net *net = dev_net(dev);
242 write_lock_bh(&dev_base_lock);
243 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
244 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
245 hlist_add_head_rcu(&dev->index_hlist,
246 dev_index_hash(net, dev->ifindex));
247 write_unlock_bh(&dev_base_lock);
249 dev_base_seq_inc(net);
254 /* Device list removal
255 * caller must respect a RCU grace period before freeing/reusing dev
257 static void unlist_netdevice(struct net_device *dev)
261 /* Unlink dev from the device chain */
262 write_lock_bh(&dev_base_lock);
263 list_del_rcu(&dev->dev_list);
264 hlist_del_rcu(&dev->name_hlist);
265 hlist_del_rcu(&dev->index_hlist);
266 write_unlock_bh(&dev_base_lock);
268 dev_base_seq_inc(dev_net(dev));
275 static RAW_NOTIFIER_HEAD(netdev_chain);
278 * Device drivers call our routines to queue packets here. We empty the
279 * queue in the local softnet handler.
282 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
283 EXPORT_PER_CPU_SYMBOL(softnet_data);
285 #ifdef CONFIG_LOCKDEP
287 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
288 * according to dev->type
290 static const unsigned short netdev_lock_type[] =
291 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
292 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
293 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
294 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
295 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
296 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
297 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
298 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
299 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
300 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
301 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
302 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
303 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
304 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
305 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
307 static const char *const netdev_lock_name[] =
308 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
309 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
310 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
311 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
312 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
313 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
314 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
315 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
316 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
317 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
318 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
319 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
320 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
321 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
322 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
324 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
325 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
327 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
331 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
332 if (netdev_lock_type[i] == dev_type)
334 /* the last key is used by default */
335 return ARRAY_SIZE(netdev_lock_type) - 1;
338 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
339 unsigned short dev_type)
343 i = netdev_lock_pos(dev_type);
344 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
345 netdev_lock_name[i]);
348 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
352 i = netdev_lock_pos(dev->type);
353 lockdep_set_class_and_name(&dev->addr_list_lock,
354 &netdev_addr_lock_key[i],
355 netdev_lock_name[i]);
358 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
359 unsigned short dev_type)
362 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
367 /*******************************************************************************
369 Protocol management and registration routines
371 *******************************************************************************/
374 * Add a protocol ID to the list. Now that the input handler is
375 * smarter we can dispense with all the messy stuff that used to be
378 * BEWARE!!! Protocol handlers, mangling input packets,
379 * MUST BE last in hash buckets and checking protocol handlers
380 * MUST start from promiscuous ptype_all chain in net_bh.
381 * It is true now, do not change it.
382 * Explanation follows: if protocol handler, mangling packet, will
383 * be the first on list, it is not able to sense, that packet
384 * is cloned and should be copied-on-write, so that it will
385 * change it and subsequent readers will get broken packet.
389 static inline struct list_head *ptype_head(const struct packet_type *pt)
391 if (pt->type == htons(ETH_P_ALL))
394 return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
398 * dev_add_pack - add packet handler
399 * @pt: packet type declaration
401 * Add a protocol handler to the networking stack. The passed &packet_type
402 * is linked into kernel lists and may not be freed until it has been
403 * removed from the kernel lists.
405 * This call does not sleep therefore it can not
406 * guarantee all CPU's that are in middle of receiving packets
407 * will see the new packet type (until the next received packet).
410 void dev_add_pack(struct packet_type *pt)
412 struct list_head *head = ptype_head(pt);
414 spin_lock(&ptype_lock);
415 list_add_rcu(&pt->list, head);
416 spin_unlock(&ptype_lock);
418 EXPORT_SYMBOL(dev_add_pack);
421 * __dev_remove_pack - remove packet handler
422 * @pt: packet type declaration
424 * Remove a protocol handler that was previously added to the kernel
425 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
426 * from the kernel lists and can be freed or reused once this function
429 * The packet type might still be in use by receivers
430 * and must not be freed until after all the CPU's have gone
431 * through a quiescent state.
433 void __dev_remove_pack(struct packet_type *pt)
435 struct list_head *head = ptype_head(pt);
436 struct packet_type *pt1;
438 spin_lock(&ptype_lock);
440 list_for_each_entry(pt1, head, list) {
442 list_del_rcu(&pt->list);
447 pr_warn("dev_remove_pack: %p not found\n", pt);
449 spin_unlock(&ptype_lock);
451 EXPORT_SYMBOL(__dev_remove_pack);
454 * dev_remove_pack - remove packet handler
455 * @pt: packet type declaration
457 * Remove a protocol handler that was previously added to the kernel
458 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
459 * from the kernel lists and can be freed or reused once this function
462 * This call sleeps to guarantee that no CPU is looking at the packet
465 void dev_remove_pack(struct packet_type *pt)
467 __dev_remove_pack(pt);
471 EXPORT_SYMBOL(dev_remove_pack);
473 /******************************************************************************
475 Device Boot-time Settings Routines
477 *******************************************************************************/
479 /* Boot time configuration table */
480 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
483 * netdev_boot_setup_add - add new setup entry
484 * @name: name of the device
485 * @map: configured settings for the device
487 * Adds new setup entry to the dev_boot_setup list. The function
488 * returns 0 on error and 1 on success. This is a generic routine to
491 static int netdev_boot_setup_add(char *name, struct ifmap *map)
493 struct netdev_boot_setup *s;
497 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
498 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
499 memset(s[i].name, 0, sizeof(s[i].name));
500 strlcpy(s[i].name, name, IFNAMSIZ);
501 memcpy(&s[i].map, map, sizeof(s[i].map));
506 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
510 * netdev_boot_setup_check - check boot time settings
511 * @dev: the netdevice
513 * Check boot time settings for the device.
514 * The found settings are set for the device to be used
515 * later in the device probing.
516 * Returns 0 if no settings found, 1 if they are.
518 int netdev_boot_setup_check(struct net_device *dev)
520 struct netdev_boot_setup *s = dev_boot_setup;
523 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
524 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
525 !strcmp(dev->name, s[i].name)) {
526 dev->irq = s[i].map.irq;
527 dev->base_addr = s[i].map.base_addr;
528 dev->mem_start = s[i].map.mem_start;
529 dev->mem_end = s[i].map.mem_end;
535 EXPORT_SYMBOL(netdev_boot_setup_check);
539 * netdev_boot_base - get address from boot time settings
540 * @prefix: prefix for network device
541 * @unit: id for network device
543 * Check boot time settings for the base address of device.
544 * The found settings are set for the device to be used
545 * later in the device probing.
546 * Returns 0 if no settings found.
548 unsigned long netdev_boot_base(const char *prefix, int unit)
550 const struct netdev_boot_setup *s = dev_boot_setup;
554 sprintf(name, "%s%d", prefix, unit);
557 * If device already registered then return base of 1
558 * to indicate not to probe for this interface
560 if (__dev_get_by_name(&init_net, name))
563 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
564 if (!strcmp(name, s[i].name))
565 return s[i].map.base_addr;
570 * Saves at boot time configured settings for any netdevice.
572 int __init netdev_boot_setup(char *str)
577 str = get_options(str, ARRAY_SIZE(ints), ints);
582 memset(&map, 0, sizeof(map));
586 map.base_addr = ints[2];
588 map.mem_start = ints[3];
590 map.mem_end = ints[4];
592 /* Add new entry to the list */
593 return netdev_boot_setup_add(str, &map);
596 __setup("netdev=", netdev_boot_setup);
598 /*******************************************************************************
600 Device Interface Subroutines
602 *******************************************************************************/
605 * __dev_get_by_name - find a device by its name
606 * @net: the applicable net namespace
607 * @name: name to find
609 * Find an interface by name. Must be called under RTNL semaphore
610 * or @dev_base_lock. If the name is found a pointer to the device
611 * is returned. If the name is not found then %NULL is returned. The
612 * reference counters are not incremented so the caller must be
613 * careful with locks.
616 struct net_device *__dev_get_by_name(struct net *net, const char *name)
618 struct hlist_node *p;
619 struct net_device *dev;
620 struct hlist_head *head = dev_name_hash(net, name);
622 hlist_for_each_entry(dev, p, head, name_hlist)
623 if (!strncmp(dev->name, name, IFNAMSIZ))
628 EXPORT_SYMBOL(__dev_get_by_name);
631 * dev_get_by_name_rcu - find a device by its name
632 * @net: the applicable net namespace
633 * @name: name to find
635 * Find an interface by name.
636 * If the name is found a pointer to the device is returned.
637 * If the name is not found then %NULL is returned.
638 * The reference counters are not incremented so the caller must be
639 * careful with locks. The caller must hold RCU lock.
642 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
644 struct hlist_node *p;
645 struct net_device *dev;
646 struct hlist_head *head = dev_name_hash(net, name);
648 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
649 if (!strncmp(dev->name, name, IFNAMSIZ))
654 EXPORT_SYMBOL(dev_get_by_name_rcu);
657 * dev_get_by_name - find a device by its name
658 * @net: the applicable net namespace
659 * @name: name to find
661 * Find an interface by name. This can be called from any
662 * context and does its own locking. The returned handle has
663 * the usage count incremented and the caller must use dev_put() to
664 * release it when it is no longer needed. %NULL is returned if no
665 * matching device is found.
668 struct net_device *dev_get_by_name(struct net *net, const char *name)
670 struct net_device *dev;
673 dev = dev_get_by_name_rcu(net, name);
679 EXPORT_SYMBOL(dev_get_by_name);
682 * __dev_get_by_index - find a device by its ifindex
683 * @net: the applicable net namespace
684 * @ifindex: index of device
686 * Search for an interface by index. Returns %NULL if the device
687 * is not found or a pointer to the device. The device has not
688 * had its reference counter increased so the caller must be careful
689 * about locking. The caller must hold either the RTNL semaphore
693 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
695 struct hlist_node *p;
696 struct net_device *dev;
697 struct hlist_head *head = dev_index_hash(net, ifindex);
699 hlist_for_each_entry(dev, p, head, index_hlist)
700 if (dev->ifindex == ifindex)
705 EXPORT_SYMBOL(__dev_get_by_index);
708 * dev_get_by_index_rcu - find a device by its ifindex
709 * @net: the applicable net namespace
710 * @ifindex: index of device
712 * Search for an interface by index. Returns %NULL if the device
713 * is not found or a pointer to the device. The device has not
714 * had its reference counter increased so the caller must be careful
715 * about locking. The caller must hold RCU lock.
718 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
720 struct hlist_node *p;
721 struct net_device *dev;
722 struct hlist_head *head = dev_index_hash(net, ifindex);
724 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
725 if (dev->ifindex == ifindex)
730 EXPORT_SYMBOL(dev_get_by_index_rcu);
734 * dev_get_by_index - find a device by its ifindex
735 * @net: the applicable net namespace
736 * @ifindex: index of device
738 * Search for an interface by index. Returns NULL if the device
739 * is not found or a pointer to the device. The device returned has
740 * had a reference added and the pointer is safe until the user calls
741 * dev_put to indicate they have finished with it.
744 struct net_device *dev_get_by_index(struct net *net, int ifindex)
746 struct net_device *dev;
749 dev = dev_get_by_index_rcu(net, ifindex);
755 EXPORT_SYMBOL(dev_get_by_index);
758 * dev_getbyhwaddr_rcu - find a device by its hardware address
759 * @net: the applicable net namespace
760 * @type: media type of device
761 * @ha: hardware address
763 * Search for an interface by MAC address. Returns NULL if the device
764 * is not found or a pointer to the device.
765 * The caller must hold RCU or RTNL.
766 * The returned device has not had its ref count increased
767 * and the caller must therefore be careful about locking
771 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
774 struct net_device *dev;
776 for_each_netdev_rcu(net, dev)
777 if (dev->type == type &&
778 !memcmp(dev->dev_addr, ha, dev->addr_len))
783 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
785 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
787 struct net_device *dev;
790 for_each_netdev(net, dev)
791 if (dev->type == type)
796 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
798 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
800 struct net_device *dev, *ret = NULL;
803 for_each_netdev_rcu(net, dev)
804 if (dev->type == type) {
812 EXPORT_SYMBOL(dev_getfirstbyhwtype);
815 * dev_get_by_flags_rcu - find any device with given flags
816 * @net: the applicable net namespace
817 * @if_flags: IFF_* values
818 * @mask: bitmask of bits in if_flags to check
820 * Search for any interface with the given flags. Returns NULL if a device
821 * is not found or a pointer to the device. Must be called inside
822 * rcu_read_lock(), and result refcount is unchanged.
825 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
828 struct net_device *dev, *ret;
831 for_each_netdev_rcu(net, dev) {
832 if (((dev->flags ^ if_flags) & mask) == 0) {
839 EXPORT_SYMBOL(dev_get_by_flags_rcu);
842 * dev_valid_name - check if name is okay for network device
845 * Network device names need to be valid file names to
846 * to allow sysfs to work. We also disallow any kind of
849 bool dev_valid_name(const char *name)
853 if (strlen(name) >= IFNAMSIZ)
855 if (!strcmp(name, ".") || !strcmp(name, ".."))
859 if (*name == '/' || isspace(*name))
865 EXPORT_SYMBOL(dev_valid_name);
868 * __dev_alloc_name - allocate a name for a device
869 * @net: network namespace to allocate the device name in
870 * @name: name format string
871 * @buf: scratch buffer and result name string
873 * Passed a format string - eg "lt%d" it will try and find a suitable
874 * id. It scans list of devices to build up a free map, then chooses
875 * the first empty slot. The caller must hold the dev_base or rtnl lock
876 * while allocating the name and adding the device in order to avoid
878 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
879 * Returns the number of the unit assigned or a negative errno code.
882 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
886 const int max_netdevices = 8*PAGE_SIZE;
887 unsigned long *inuse;
888 struct net_device *d;
890 p = strnchr(name, IFNAMSIZ-1, '%');
893 * Verify the string as this thing may have come from
894 * the user. There must be either one "%d" and no other "%"
897 if (p[1] != 'd' || strchr(p + 2, '%'))
900 /* Use one page as a bit array of possible slots */
901 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
905 for_each_netdev(net, d) {
906 if (!sscanf(d->name, name, &i))
908 if (i < 0 || i >= max_netdevices)
911 /* avoid cases where sscanf is not exact inverse of printf */
912 snprintf(buf, IFNAMSIZ, name, i);
913 if (!strncmp(buf, d->name, IFNAMSIZ))
917 i = find_first_zero_bit(inuse, max_netdevices);
918 free_page((unsigned long) inuse);
922 snprintf(buf, IFNAMSIZ, name, i);
923 if (!__dev_get_by_name(net, buf))
926 /* It is possible to run out of possible slots
927 * when the name is long and there isn't enough space left
928 * for the digits, or if all bits are used.
934 * dev_alloc_name - allocate a name for a device
936 * @name: name format string
938 * Passed a format string - eg "lt%d" it will try and find a suitable
939 * id. It scans list of devices to build up a free map, then chooses
940 * the first empty slot. The caller must hold the dev_base or rtnl lock
941 * while allocating the name and adding the device in order to avoid
943 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
944 * Returns the number of the unit assigned or a negative errno code.
947 int dev_alloc_name(struct net_device *dev, const char *name)
953 BUG_ON(!dev_net(dev));
955 ret = __dev_alloc_name(net, name, buf);
957 strlcpy(dev->name, buf, IFNAMSIZ);
960 EXPORT_SYMBOL(dev_alloc_name);
962 static int dev_get_valid_name(struct net_device *dev, const char *name)
966 BUG_ON(!dev_net(dev));
969 if (!dev_valid_name(name))
972 if (strchr(name, '%'))
973 return dev_alloc_name(dev, name);
974 else if (__dev_get_by_name(net, name))
976 else if (dev->name != name)
977 strlcpy(dev->name, name, IFNAMSIZ);
983 * dev_change_name - change name of a device
985 * @newname: name (or format string) must be at least IFNAMSIZ
987 * Change name of a device, can pass format strings "eth%d".
990 int dev_change_name(struct net_device *dev, const char *newname)
992 char oldname[IFNAMSIZ];
998 BUG_ON(!dev_net(dev));
1001 if (dev->flags & IFF_UP)
1004 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
1007 memcpy(oldname, dev->name, IFNAMSIZ);
1009 err = dev_get_valid_name(dev, newname);
1014 ret = device_rename(&dev->dev, dev->name);
1016 memcpy(dev->name, oldname, IFNAMSIZ);
1020 write_lock_bh(&dev_base_lock);
1021 hlist_del_rcu(&dev->name_hlist);
1022 write_unlock_bh(&dev_base_lock);
1026 write_lock_bh(&dev_base_lock);
1027 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1028 write_unlock_bh(&dev_base_lock);
1030 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1031 ret = notifier_to_errno(ret);
1034 /* err >= 0 after dev_alloc_name() or stores the first errno */
1037 memcpy(dev->name, oldname, IFNAMSIZ);
1040 pr_err("%s: name change rollback failed: %d\n",
1049 * dev_set_alias - change ifalias of a device
1051 * @alias: name up to IFALIASZ
1052 * @len: limit of bytes to copy from info
1054 * Set ifalias for a device,
1056 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1060 if (len >= IFALIASZ)
1065 kfree(dev->ifalias);
1066 dev->ifalias = NULL;
1071 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1075 strlcpy(dev->ifalias, alias, len+1);
1081 * netdev_features_change - device changes features
1082 * @dev: device to cause notification
1084 * Called to indicate a device has changed features.
1086 void netdev_features_change(struct net_device *dev)
1088 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1090 EXPORT_SYMBOL(netdev_features_change);
1093 * netdev_state_change - device changes state
1094 * @dev: device to cause notification
1096 * Called to indicate a device has changed state. This function calls
1097 * the notifier chains for netdev_chain and sends a NEWLINK message
1098 * to the routing socket.
1100 void netdev_state_change(struct net_device *dev)
1102 if (dev->flags & IFF_UP) {
1103 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1104 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1107 EXPORT_SYMBOL(netdev_state_change);
1109 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1111 return call_netdevice_notifiers(event, dev);
1113 EXPORT_SYMBOL(netdev_bonding_change);
1116 * dev_load - load a network module
1117 * @net: the applicable net namespace
1118 * @name: name of interface
1120 * If a network interface is not present and the process has suitable
1121 * privileges this function loads the module. If module loading is not
1122 * available in this kernel then it becomes a nop.
1125 void dev_load(struct net *net, const char *name)
1127 struct net_device *dev;
1131 dev = dev_get_by_name_rcu(net, name);
1135 if (no_module && capable(CAP_NET_ADMIN))
1136 no_module = request_module("netdev-%s", name);
1137 if (no_module && capable(CAP_SYS_MODULE)) {
1138 if (!request_module("%s", name))
1139 pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
1143 EXPORT_SYMBOL(dev_load);
1145 static int __dev_open(struct net_device *dev)
1147 const struct net_device_ops *ops = dev->netdev_ops;
1152 if (!netif_device_present(dev))
1155 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1156 ret = notifier_to_errno(ret);
1160 set_bit(__LINK_STATE_START, &dev->state);
1162 if (ops->ndo_validate_addr)
1163 ret = ops->ndo_validate_addr(dev);
1165 if (!ret && ops->ndo_open)
1166 ret = ops->ndo_open(dev);
1169 clear_bit(__LINK_STATE_START, &dev->state);
1171 dev->flags |= IFF_UP;
1172 net_dmaengine_get();
1173 dev_set_rx_mode(dev);
1181 * dev_open - prepare an interface for use.
1182 * @dev: device to open
1184 * Takes a device from down to up state. The device's private open
1185 * function is invoked and then the multicast lists are loaded. Finally
1186 * the device is moved into the up state and a %NETDEV_UP message is
1187 * sent to the netdev notifier chain.
1189 * Calling this function on an active interface is a nop. On a failure
1190 * a negative errno code is returned.
1192 int dev_open(struct net_device *dev)
1196 if (dev->flags & IFF_UP)
1199 ret = __dev_open(dev);
1203 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1204 call_netdevice_notifiers(NETDEV_UP, dev);
1208 EXPORT_SYMBOL(dev_open);
1210 static int __dev_close_many(struct list_head *head)
1212 struct net_device *dev;
1217 list_for_each_entry(dev, head, unreg_list) {
1218 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1220 clear_bit(__LINK_STATE_START, &dev->state);
1222 /* Synchronize to scheduled poll. We cannot touch poll list, it
1223 * can be even on different cpu. So just clear netif_running().
1225 * dev->stop() will invoke napi_disable() on all of it's
1226 * napi_struct instances on this device.
1228 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1231 dev_deactivate_many(head);
1233 list_for_each_entry(dev, head, unreg_list) {
1234 const struct net_device_ops *ops = dev->netdev_ops;
1237 * Call the device specific close. This cannot fail.
1238 * Only if device is UP
1240 * We allow it to be called even after a DETACH hot-plug
1246 dev->flags &= ~IFF_UP;
1247 net_dmaengine_put();
1253 static int __dev_close(struct net_device *dev)
1258 list_add(&dev->unreg_list, &single);
1259 retval = __dev_close_many(&single);
1264 static int dev_close_many(struct list_head *head)
1266 struct net_device *dev, *tmp;
1267 LIST_HEAD(tmp_list);
1269 list_for_each_entry_safe(dev, tmp, head, unreg_list)
1270 if (!(dev->flags & IFF_UP))
1271 list_move(&dev->unreg_list, &tmp_list);
1273 __dev_close_many(head);
1275 list_for_each_entry(dev, head, unreg_list) {
1276 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1277 call_netdevice_notifiers(NETDEV_DOWN, dev);
1280 /* rollback_registered_many needs the complete original list */
1281 list_splice(&tmp_list, head);
1286 * dev_close - shutdown an interface.
1287 * @dev: device to shutdown
1289 * This function moves an active device into down state. A
1290 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1291 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1294 int dev_close(struct net_device *dev)
1296 if (dev->flags & IFF_UP) {
1299 list_add(&dev->unreg_list, &single);
1300 dev_close_many(&single);
1305 EXPORT_SYMBOL(dev_close);
1309 * dev_disable_lro - disable Large Receive Offload on a device
1312 * Disable Large Receive Offload (LRO) on a net device. Must be
1313 * called under RTNL. This is needed if received packets may be
1314 * forwarded to another interface.
1316 void dev_disable_lro(struct net_device *dev)
1319 * If we're trying to disable lro on a vlan device
1320 * use the underlying physical device instead
1322 if (is_vlan_dev(dev))
1323 dev = vlan_dev_real_dev(dev);
1325 dev->wanted_features &= ~NETIF_F_LRO;
1326 netdev_update_features(dev);
1328 if (unlikely(dev->features & NETIF_F_LRO))
1329 netdev_WARN(dev, "failed to disable LRO!\n");
1331 EXPORT_SYMBOL(dev_disable_lro);
1334 static int dev_boot_phase = 1;
1337 * register_netdevice_notifier - register a network notifier block
1340 * Register a notifier to be called when network device events occur.
1341 * The notifier passed is linked into the kernel structures and must
1342 * not be reused until it has been unregistered. A negative errno code
1343 * is returned on a failure.
1345 * When registered all registration and up events are replayed
1346 * to the new notifier to allow device to have a race free
1347 * view of the network device list.
1350 int register_netdevice_notifier(struct notifier_block *nb)
1352 struct net_device *dev;
1353 struct net_device *last;
1358 err = raw_notifier_chain_register(&netdev_chain, nb);
1364 for_each_netdev(net, dev) {
1365 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1366 err = notifier_to_errno(err);
1370 if (!(dev->flags & IFF_UP))
1373 nb->notifier_call(nb, NETDEV_UP, dev);
1384 for_each_netdev(net, dev) {
1388 if (dev->flags & IFF_UP) {
1389 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1390 nb->notifier_call(nb, NETDEV_DOWN, dev);
1392 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1393 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1398 raw_notifier_chain_unregister(&netdev_chain, nb);
1401 EXPORT_SYMBOL(register_netdevice_notifier);
1404 * unregister_netdevice_notifier - unregister a network notifier block
1407 * Unregister a notifier previously registered by
1408 * register_netdevice_notifier(). The notifier is unlinked into the
1409 * kernel structures and may then be reused. A negative errno code
1410 * is returned on a failure.
1412 * After unregistering unregister and down device events are synthesized
1413 * for all devices on the device list to the removed notifier to remove
1414 * the need for special case cleanup code.
1417 int unregister_netdevice_notifier(struct notifier_block *nb)
1419 struct net_device *dev;
1424 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1429 for_each_netdev(net, dev) {
1430 if (dev->flags & IFF_UP) {
1431 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1432 nb->notifier_call(nb, NETDEV_DOWN, dev);
1434 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1435 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1442 EXPORT_SYMBOL(unregister_netdevice_notifier);
1445 * call_netdevice_notifiers - call all network notifier blocks
1446 * @val: value passed unmodified to notifier function
1447 * @dev: net_device pointer passed unmodified to notifier function
1449 * Call all network notifier blocks. Parameters and return value
1450 * are as for raw_notifier_call_chain().
1453 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1456 return raw_notifier_call_chain(&netdev_chain, val, dev);
1458 EXPORT_SYMBOL(call_netdevice_notifiers);
1460 static struct static_key netstamp_needed __read_mostly;
1461 #ifdef HAVE_JUMP_LABEL
1462 /* We are not allowed to call static_key_slow_dec() from irq context
1463 * If net_disable_timestamp() is called from irq context, defer the
1464 * static_key_slow_dec() calls.
1466 static atomic_t netstamp_needed_deferred;
1469 void net_enable_timestamp(void)
1471 #ifdef HAVE_JUMP_LABEL
1472 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
1476 static_key_slow_dec(&netstamp_needed);
1480 WARN_ON(in_interrupt());
1481 static_key_slow_inc(&netstamp_needed);
1483 EXPORT_SYMBOL(net_enable_timestamp);
1485 void net_disable_timestamp(void)
1487 #ifdef HAVE_JUMP_LABEL
1488 if (in_interrupt()) {
1489 atomic_inc(&netstamp_needed_deferred);
1493 static_key_slow_dec(&netstamp_needed);
1495 EXPORT_SYMBOL(net_disable_timestamp);
1497 static inline void net_timestamp_set(struct sk_buff *skb)
1499 skb->tstamp.tv64 = 0;
1500 if (static_key_false(&netstamp_needed))
1501 __net_timestamp(skb);
1504 #define net_timestamp_check(COND, SKB) \
1505 if (static_key_false(&netstamp_needed)) { \
1506 if ((COND) && !(SKB)->tstamp.tv64) \
1507 __net_timestamp(SKB); \
1510 static int net_hwtstamp_validate(struct ifreq *ifr)
1512 struct hwtstamp_config cfg;
1513 enum hwtstamp_tx_types tx_type;
1514 enum hwtstamp_rx_filters rx_filter;
1515 int tx_type_valid = 0;
1516 int rx_filter_valid = 0;
1518 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
1521 if (cfg.flags) /* reserved for future extensions */
1524 tx_type = cfg.tx_type;
1525 rx_filter = cfg.rx_filter;
1528 case HWTSTAMP_TX_OFF:
1529 case HWTSTAMP_TX_ON:
1530 case HWTSTAMP_TX_ONESTEP_SYNC:
1535 switch (rx_filter) {
1536 case HWTSTAMP_FILTER_NONE:
1537 case HWTSTAMP_FILTER_ALL:
1538 case HWTSTAMP_FILTER_SOME:
1539 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1540 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1541 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1542 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1543 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1544 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1545 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1546 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1547 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1548 case HWTSTAMP_FILTER_PTP_V2_EVENT:
1549 case HWTSTAMP_FILTER_PTP_V2_SYNC:
1550 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1551 rx_filter_valid = 1;
1555 if (!tx_type_valid || !rx_filter_valid)
1561 static inline bool is_skb_forwardable(struct net_device *dev,
1562 struct sk_buff *skb)
1566 if (!(dev->flags & IFF_UP))
1569 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1570 if (skb->len <= len)
1573 /* if TSO is enabled, we don't care about the length as the packet
1574 * could be forwarded without being segmented before
1576 if (skb_is_gso(skb))
1583 * dev_forward_skb - loopback an skb to another netif
1585 * @dev: destination network device
1586 * @skb: buffer to forward
1589 * NET_RX_SUCCESS (no congestion)
1590 * NET_RX_DROP (packet was dropped, but freed)
1592 * dev_forward_skb can be used for injecting an skb from the
1593 * start_xmit function of one device into the receive queue
1594 * of another device.
1596 * The receiving device may be in another namespace, so
1597 * we have to clear all information in the skb that could
1598 * impact namespace isolation.
1600 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1602 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
1603 if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
1604 atomic_long_inc(&dev->rx_dropped);
1613 if (unlikely(!is_skb_forwardable(dev, skb))) {
1614 atomic_long_inc(&dev->rx_dropped);
1621 skb->tstamp.tv64 = 0;
1622 skb->pkt_type = PACKET_HOST;
1623 skb->protocol = eth_type_trans(skb, dev);
1627 return netif_rx(skb);
1629 EXPORT_SYMBOL_GPL(dev_forward_skb);
1631 static inline int deliver_skb(struct sk_buff *skb,
1632 struct packet_type *pt_prev,
1633 struct net_device *orig_dev)
1635 atomic_inc(&skb->users);
1636 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1640 * Support routine. Sends outgoing frames to any network
1641 * taps currently in use.
1644 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1646 struct packet_type *ptype;
1647 struct sk_buff *skb2 = NULL;
1648 struct packet_type *pt_prev = NULL;
1651 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1652 /* Never send packets back to the socket
1653 * they originated from - MvS (miquels@drinkel.ow.org)
1655 if ((ptype->dev == dev || !ptype->dev) &&
1656 (ptype->af_packet_priv == NULL ||
1657 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1659 deliver_skb(skb2, pt_prev, skb->dev);
1664 skb2 = skb_clone(skb, GFP_ATOMIC);
1668 net_timestamp_set(skb2);
1670 /* skb->nh should be correctly
1671 set by sender, so that the second statement is
1672 just protection against buggy protocols.
1674 skb_reset_mac_header(skb2);
1676 if (skb_network_header(skb2) < skb2->data ||
1677 skb2->network_header > skb2->tail) {
1678 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1679 ntohs(skb2->protocol),
1681 skb_reset_network_header(skb2);
1684 skb2->transport_header = skb2->network_header;
1685 skb2->pkt_type = PACKET_OUTGOING;
1690 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1695 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1696 * @dev: Network device
1697 * @txq: number of queues available
1699 * If real_num_tx_queues is changed the tc mappings may no longer be
1700 * valid. To resolve this verify the tc mapping remains valid and if
1701 * not NULL the mapping. With no priorities mapping to this
1702 * offset/count pair it will no longer be used. In the worst case TC0
1703 * is invalid nothing can be done so disable priority mappings. If is
1704 * expected that drivers will fix this mapping if they can before
1705 * calling netif_set_real_num_tx_queues.
1707 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1710 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1712 /* If TC0 is invalidated disable TC mapping */
1713 if (tc->offset + tc->count > txq) {
1714 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1719 /* Invalidated prio to tc mappings set to TC0 */
1720 for (i = 1; i < TC_BITMASK + 1; i++) {
1721 int q = netdev_get_prio_tc_map(dev, i);
1723 tc = &dev->tc_to_txq[q];
1724 if (tc->offset + tc->count > txq) {
1725 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1727 netdev_set_prio_tc_map(dev, i, 0);
1733 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1734 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1736 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1740 if (txq < 1 || txq > dev->num_tx_queues)
1743 if (dev->reg_state == NETREG_REGISTERED ||
1744 dev->reg_state == NETREG_UNREGISTERING) {
1747 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1753 netif_setup_tc(dev, txq);
1755 if (txq < dev->real_num_tx_queues)
1756 qdisc_reset_all_tx_gt(dev, txq);
1759 dev->real_num_tx_queues = txq;
1762 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1766 * netif_set_real_num_rx_queues - set actual number of RX queues used
1767 * @dev: Network device
1768 * @rxq: Actual number of RX queues
1770 * This must be called either with the rtnl_lock held or before
1771 * registration of the net device. Returns 0 on success, or a
1772 * negative error code. If called before registration, it always
1775 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1779 if (rxq < 1 || rxq > dev->num_rx_queues)
1782 if (dev->reg_state == NETREG_REGISTERED) {
1785 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1791 dev->real_num_rx_queues = rxq;
1794 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1798 * netif_get_num_default_rss_queues - default number of RSS queues
1800 * This routine should set an upper limit on the number of RSS queues
1801 * used by default by multiqueue devices.
1803 int netif_get_num_default_rss_queues(void)
1805 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
1807 EXPORT_SYMBOL(netif_get_num_default_rss_queues);
1809 static inline void __netif_reschedule(struct Qdisc *q)
1811 struct softnet_data *sd;
1812 unsigned long flags;
1814 local_irq_save(flags);
1815 sd = &__get_cpu_var(softnet_data);
1816 q->next_sched = NULL;
1817 *sd->output_queue_tailp = q;
1818 sd->output_queue_tailp = &q->next_sched;
1819 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1820 local_irq_restore(flags);
1823 void __netif_schedule(struct Qdisc *q)
1825 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1826 __netif_reschedule(q);
1828 EXPORT_SYMBOL(__netif_schedule);
1830 void dev_kfree_skb_irq(struct sk_buff *skb)
1832 if (atomic_dec_and_test(&skb->users)) {
1833 struct softnet_data *sd;
1834 unsigned long flags;
1836 local_irq_save(flags);
1837 sd = &__get_cpu_var(softnet_data);
1838 skb->next = sd->completion_queue;
1839 sd->completion_queue = skb;
1840 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1841 local_irq_restore(flags);
1844 EXPORT_SYMBOL(dev_kfree_skb_irq);
1846 void dev_kfree_skb_any(struct sk_buff *skb)
1848 if (in_irq() || irqs_disabled())
1849 dev_kfree_skb_irq(skb);
1853 EXPORT_SYMBOL(dev_kfree_skb_any);
1857 * netif_device_detach - mark device as removed
1858 * @dev: network device
1860 * Mark device as removed from system and therefore no longer available.
1862 void netif_device_detach(struct net_device *dev)
1864 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1865 netif_running(dev)) {
1866 netif_tx_stop_all_queues(dev);
1869 EXPORT_SYMBOL(netif_device_detach);
1872 * netif_device_attach - mark device as attached
1873 * @dev: network device
1875 * Mark device as attached from system and restart if needed.
1877 void netif_device_attach(struct net_device *dev)
1879 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1880 netif_running(dev)) {
1881 netif_tx_wake_all_queues(dev);
1882 __netdev_watchdog_up(dev);
1885 EXPORT_SYMBOL(netif_device_attach);
1887 static void skb_warn_bad_offload(const struct sk_buff *skb)
1889 static const netdev_features_t null_features = 0;
1890 struct net_device *dev = skb->dev;
1891 const char *driver = "";
1893 if (dev && dev->dev.parent)
1894 driver = dev_driver_string(dev->dev.parent);
1896 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
1897 "gso_type=%d ip_summed=%d\n",
1898 driver, dev ? &dev->features : &null_features,
1899 skb->sk ? &skb->sk->sk_route_caps : &null_features,
1900 skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
1901 skb_shinfo(skb)->gso_type, skb->ip_summed);
1905 * Invalidate hardware checksum when packet is to be mangled, and
1906 * complete checksum manually on outgoing path.
1908 int skb_checksum_help(struct sk_buff *skb)
1911 int ret = 0, offset;
1913 if (skb->ip_summed == CHECKSUM_COMPLETE)
1914 goto out_set_summed;
1916 if (unlikely(skb_shinfo(skb)->gso_size)) {
1917 skb_warn_bad_offload(skb);
1921 offset = skb_checksum_start_offset(skb);
1922 BUG_ON(offset >= skb_headlen(skb));
1923 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1925 offset += skb->csum_offset;
1926 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1928 if (skb_cloned(skb) &&
1929 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1930 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1935 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1937 skb->ip_summed = CHECKSUM_NONE;
1941 EXPORT_SYMBOL(skb_checksum_help);
1944 * skb_gso_segment - Perform segmentation on skb.
1945 * @skb: buffer to segment
1946 * @features: features for the output path (see dev->features)
1948 * This function segments the given skb and returns a list of segments.
1950 * It may return NULL if the skb requires no segmentation. This is
1951 * only possible when GSO is used for verifying header integrity.
1953 struct sk_buff *skb_gso_segment(struct sk_buff *skb,
1954 netdev_features_t features)
1956 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1957 struct packet_type *ptype;
1958 __be16 type = skb->protocol;
1959 int vlan_depth = ETH_HLEN;
1962 while (type == htons(ETH_P_8021Q)) {
1963 struct vlan_hdr *vh;
1965 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1966 return ERR_PTR(-EINVAL);
1968 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1969 type = vh->h_vlan_encapsulated_proto;
1970 vlan_depth += VLAN_HLEN;
1973 skb_reset_mac_header(skb);
1974 skb->mac_len = skb->network_header - skb->mac_header;
1975 __skb_pull(skb, skb->mac_len);
1977 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1978 skb_warn_bad_offload(skb);
1980 if (skb_header_cloned(skb) &&
1981 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1982 return ERR_PTR(err);
1986 list_for_each_entry_rcu(ptype,
1987 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1988 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1989 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1990 err = ptype->gso_send_check(skb);
1991 segs = ERR_PTR(err);
1992 if (err || skb_gso_ok(skb, features))
1994 __skb_push(skb, (skb->data -
1995 skb_network_header(skb)));
1997 segs = ptype->gso_segment(skb, features);
2003 __skb_push(skb, skb->data - skb_mac_header(skb));
2007 EXPORT_SYMBOL(skb_gso_segment);
2009 /* Take action when hardware reception checksum errors are detected. */
2011 void netdev_rx_csum_fault(struct net_device *dev)
2013 if (net_ratelimit()) {
2014 pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
2018 EXPORT_SYMBOL(netdev_rx_csum_fault);
2021 /* Actually, we should eliminate this check as soon as we know, that:
2022 * 1. IOMMU is present and allows to map all the memory.
2023 * 2. No high memory really exists on this machine.
2026 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2028 #ifdef CONFIG_HIGHMEM
2030 if (!(dev->features & NETIF_F_HIGHDMA)) {
2031 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2032 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2033 if (PageHighMem(skb_frag_page(frag)))
2038 if (PCI_DMA_BUS_IS_PHYS) {
2039 struct device *pdev = dev->dev.parent;
2043 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2044 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2045 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2046 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2055 void (*destructor)(struct sk_buff *skb);
2058 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2060 static void dev_gso_skb_destructor(struct sk_buff *skb)
2062 struct dev_gso_cb *cb;
2065 struct sk_buff *nskb = skb->next;
2067 skb->next = nskb->next;
2070 } while (skb->next);
2072 cb = DEV_GSO_CB(skb);
2074 cb->destructor(skb);
2078 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2079 * @skb: buffer to segment
2080 * @features: device features as applicable to this skb
2082 * This function segments the given skb and stores the list of segments
2085 static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features)
2087 struct sk_buff *segs;
2089 segs = skb_gso_segment(skb, features);
2091 /* Verifying header integrity only. */
2096 return PTR_ERR(segs);
2099 DEV_GSO_CB(skb)->destructor = skb->destructor;
2100 skb->destructor = dev_gso_skb_destructor;
2105 static bool can_checksum_protocol(netdev_features_t features, __be16 protocol)
2107 return ((features & NETIF_F_GEN_CSUM) ||
2108 ((features & NETIF_F_V4_CSUM) &&
2109 protocol == htons(ETH_P_IP)) ||
2110 ((features & NETIF_F_V6_CSUM) &&
2111 protocol == htons(ETH_P_IPV6)) ||
2112 ((features & NETIF_F_FCOE_CRC) &&
2113 protocol == htons(ETH_P_FCOE)));
2116 static netdev_features_t harmonize_features(struct sk_buff *skb,
2117 __be16 protocol, netdev_features_t features)
2119 if (!can_checksum_protocol(features, protocol)) {
2120 features &= ~NETIF_F_ALL_CSUM;
2121 features &= ~NETIF_F_SG;
2122 } else if (illegal_highdma(skb->dev, skb)) {
2123 features &= ~NETIF_F_SG;
2129 netdev_features_t netif_skb_features(struct sk_buff *skb)
2131 __be16 protocol = skb->protocol;
2132 netdev_features_t features = skb->dev->features;
2134 if (protocol == htons(ETH_P_8021Q)) {
2135 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2136 protocol = veh->h_vlan_encapsulated_proto;
2137 } else if (!vlan_tx_tag_present(skb)) {
2138 return harmonize_features(skb, protocol, features);
2141 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2143 if (protocol != htons(ETH_P_8021Q)) {
2144 return harmonize_features(skb, protocol, features);
2146 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2147 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2148 return harmonize_features(skb, protocol, features);
2151 EXPORT_SYMBOL(netif_skb_features);
2154 * Returns true if either:
2155 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2156 * 2. skb is fragmented and the device does not support SG, or if
2157 * at least one of fragments is in highmem and device does not
2158 * support DMA from it.
2160 static inline int skb_needs_linearize(struct sk_buff *skb,
2163 return skb_is_nonlinear(skb) &&
2164 ((skb_has_frag_list(skb) &&
2165 !(features & NETIF_F_FRAGLIST)) ||
2166 (skb_shinfo(skb)->nr_frags &&
2167 !(features & NETIF_F_SG)));
2170 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2171 struct netdev_queue *txq)
2173 const struct net_device_ops *ops = dev->netdev_ops;
2174 int rc = NETDEV_TX_OK;
2175 unsigned int skb_len;
2177 if (likely(!skb->next)) {
2178 netdev_features_t features;
2181 * If device doesn't need skb->dst, release it right now while
2182 * its hot in this cpu cache
2184 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2187 if (!list_empty(&ptype_all))
2188 dev_queue_xmit_nit(skb, dev);
2190 features = netif_skb_features(skb);
2192 if (vlan_tx_tag_present(skb) &&
2193 !(features & NETIF_F_HW_VLAN_TX)) {
2194 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2201 if (netif_needs_gso(skb, features)) {
2202 if (unlikely(dev_gso_segment(skb, features)))
2207 if (skb_needs_linearize(skb, features) &&
2208 __skb_linearize(skb))
2211 /* If packet is not checksummed and device does not
2212 * support checksumming for this protocol, complete
2213 * checksumming here.
2215 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2216 skb_set_transport_header(skb,
2217 skb_checksum_start_offset(skb));
2218 if (!(features & NETIF_F_ALL_CSUM) &&
2219 skb_checksum_help(skb))
2225 rc = ops->ndo_start_xmit(skb, dev);
2226 trace_net_dev_xmit(skb, rc, dev, skb_len);
2227 if (rc == NETDEV_TX_OK)
2228 txq_trans_update(txq);
2234 struct sk_buff *nskb = skb->next;
2236 skb->next = nskb->next;
2240 * If device doesn't need nskb->dst, release it right now while
2241 * its hot in this cpu cache
2243 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2246 skb_len = nskb->len;
2247 rc = ops->ndo_start_xmit(nskb, dev);
2248 trace_net_dev_xmit(nskb, rc, dev, skb_len);
2249 if (unlikely(rc != NETDEV_TX_OK)) {
2250 if (rc & ~NETDEV_TX_MASK)
2251 goto out_kfree_gso_skb;
2252 nskb->next = skb->next;
2256 txq_trans_update(txq);
2257 if (unlikely(netif_xmit_stopped(txq) && skb->next))
2258 return NETDEV_TX_BUSY;
2259 } while (skb->next);
2262 if (likely(skb->next == NULL))
2263 skb->destructor = DEV_GSO_CB(skb)->destructor;
2270 static u32 hashrnd __read_mostly;
2273 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2274 * to be used as a distribution range.
2276 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2277 unsigned int num_tx_queues)
2281 u16 qcount = num_tx_queues;
2283 if (skb_rx_queue_recorded(skb)) {
2284 hash = skb_get_rx_queue(skb);
2285 while (unlikely(hash >= num_tx_queues))
2286 hash -= num_tx_queues;
2291 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2292 qoffset = dev->tc_to_txq[tc].offset;
2293 qcount = dev->tc_to_txq[tc].count;
2296 if (skb->sk && skb->sk->sk_hash)
2297 hash = skb->sk->sk_hash;
2299 hash = (__force u16) skb->protocol;
2300 hash = jhash_1word(hash, hashrnd);
2302 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2304 EXPORT_SYMBOL(__skb_tx_hash);
2306 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2308 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2309 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
2310 dev->name, queue_index,
2311 dev->real_num_tx_queues);
2317 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2320 struct xps_dev_maps *dev_maps;
2321 struct xps_map *map;
2322 int queue_index = -1;
2325 dev_maps = rcu_dereference(dev->xps_maps);
2327 map = rcu_dereference(
2328 dev_maps->cpu_map[raw_smp_processor_id()]);
2331 queue_index = map->queues[0];
2334 if (skb->sk && skb->sk->sk_hash)
2335 hash = skb->sk->sk_hash;
2337 hash = (__force u16) skb->protocol ^
2339 hash = jhash_1word(hash, hashrnd);
2340 queue_index = map->queues[
2341 ((u64)hash * map->len) >> 32];
2343 if (unlikely(queue_index >= dev->real_num_tx_queues))
2355 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2356 struct sk_buff *skb)
2359 const struct net_device_ops *ops = dev->netdev_ops;
2361 if (dev->real_num_tx_queues == 1)
2363 else if (ops->ndo_select_queue) {
2364 queue_index = ops->ndo_select_queue(dev, skb);
2365 queue_index = dev_cap_txqueue(dev, queue_index);
2367 struct sock *sk = skb->sk;
2368 queue_index = sk_tx_queue_get(sk);
2370 if (queue_index < 0 || skb->ooo_okay ||
2371 queue_index >= dev->real_num_tx_queues) {
2372 int old_index = queue_index;
2374 queue_index = get_xps_queue(dev, skb);
2375 if (queue_index < 0)
2376 queue_index = skb_tx_hash(dev, skb);
2378 if (queue_index != old_index && sk) {
2379 struct dst_entry *dst =
2380 rcu_dereference_check(sk->sk_dst_cache, 1);
2382 if (dst && skb_dst(skb) == dst)
2383 sk_tx_queue_set(sk, queue_index);
2388 skb_set_queue_mapping(skb, queue_index);
2389 return netdev_get_tx_queue(dev, queue_index);
2392 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2393 struct net_device *dev,
2394 struct netdev_queue *txq)
2396 spinlock_t *root_lock = qdisc_lock(q);
2400 qdisc_skb_cb(skb)->pkt_len = skb->len;
2401 qdisc_calculate_pkt_len(skb, q);
2403 * Heuristic to force contended enqueues to serialize on a
2404 * separate lock before trying to get qdisc main lock.
2405 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2406 * and dequeue packets faster.
2408 contended = qdisc_is_running(q);
2409 if (unlikely(contended))
2410 spin_lock(&q->busylock);
2412 spin_lock(root_lock);
2413 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2416 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2417 qdisc_run_begin(q)) {
2419 * This is a work-conserving queue; there are no old skbs
2420 * waiting to be sent out; and the qdisc is not running -
2421 * xmit the skb directly.
2423 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2426 qdisc_bstats_update(q, skb);
2428 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2429 if (unlikely(contended)) {
2430 spin_unlock(&q->busylock);
2437 rc = NET_XMIT_SUCCESS;
2440 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2441 if (qdisc_run_begin(q)) {
2442 if (unlikely(contended)) {
2443 spin_unlock(&q->busylock);
2449 spin_unlock(root_lock);
2450 if (unlikely(contended))
2451 spin_unlock(&q->busylock);
2455 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
2456 static void skb_update_prio(struct sk_buff *skb)
2458 struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
2460 if ((!skb->priority) && (skb->sk) && map)
2461 skb->priority = map->priomap[skb->sk->sk_cgrp_prioidx];
2464 #define skb_update_prio(skb)
2467 static DEFINE_PER_CPU(int, xmit_recursion);
2468 #define RECURSION_LIMIT 10
2471 * dev_loopback_xmit - loop back @skb
2472 * @skb: buffer to transmit
2474 int dev_loopback_xmit(struct sk_buff *skb)
2476 skb_reset_mac_header(skb);
2477 __skb_pull(skb, skb_network_offset(skb));
2478 skb->pkt_type = PACKET_LOOPBACK;
2479 skb->ip_summed = CHECKSUM_UNNECESSARY;
2480 WARN_ON(!skb_dst(skb));
2485 EXPORT_SYMBOL(dev_loopback_xmit);
2488 * dev_queue_xmit - transmit a buffer
2489 * @skb: buffer to transmit
2491 * Queue a buffer for transmission to a network device. The caller must
2492 * have set the device and priority and built the buffer before calling
2493 * this function. The function can be called from an interrupt.
2495 * A negative errno code is returned on a failure. A success does not
2496 * guarantee the frame will be transmitted as it may be dropped due
2497 * to congestion or traffic shaping.
2499 * -----------------------------------------------------------------------------------
2500 * I notice this method can also return errors from the queue disciplines,
2501 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2504 * Regardless of the return value, the skb is consumed, so it is currently
2505 * difficult to retry a send to this method. (You can bump the ref count
2506 * before sending to hold a reference for retry if you are careful.)
2508 * When calling this method, interrupts MUST be enabled. This is because
2509 * the BH enable code must have IRQs enabled so that it will not deadlock.
2512 int dev_queue_xmit(struct sk_buff *skb)
2514 struct net_device *dev = skb->dev;
2515 struct netdev_queue *txq;
2519 /* Disable soft irqs for various locks below. Also
2520 * stops preemption for RCU.
2524 skb_update_prio(skb);
2526 txq = dev_pick_tx(dev, skb);
2527 q = rcu_dereference_bh(txq->qdisc);
2529 #ifdef CONFIG_NET_CLS_ACT
2530 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2532 trace_net_dev_queue(skb);
2534 rc = __dev_xmit_skb(skb, q, dev, txq);
2538 /* The device has no queue. Common case for software devices:
2539 loopback, all the sorts of tunnels...
2541 Really, it is unlikely that netif_tx_lock protection is necessary
2542 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2544 However, it is possible, that they rely on protection
2547 Check this and shot the lock. It is not prone from deadlocks.
2548 Either shot noqueue qdisc, it is even simpler 8)
2550 if (dev->flags & IFF_UP) {
2551 int cpu = smp_processor_id(); /* ok because BHs are off */
2553 if (txq->xmit_lock_owner != cpu) {
2555 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2556 goto recursion_alert;
2558 HARD_TX_LOCK(dev, txq, cpu);
2560 if (!netif_xmit_stopped(txq)) {
2561 __this_cpu_inc(xmit_recursion);
2562 rc = dev_hard_start_xmit(skb, dev, txq);
2563 __this_cpu_dec(xmit_recursion);
2564 if (dev_xmit_complete(rc)) {
2565 HARD_TX_UNLOCK(dev, txq);
2569 HARD_TX_UNLOCK(dev, txq);
2570 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2573 /* Recursion is detected! It is possible,
2577 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2583 rcu_read_unlock_bh();
2588 rcu_read_unlock_bh();
2591 EXPORT_SYMBOL(dev_queue_xmit);
2594 /*=======================================================================
2596 =======================================================================*/
2598 int netdev_max_backlog __read_mostly = 1000;
2599 int netdev_tstamp_prequeue __read_mostly = 1;
2600 int netdev_budget __read_mostly = 300;
2601 int weight_p __read_mostly = 64; /* old backlog weight */
2603 /* Called with irq disabled */
2604 static inline void ____napi_schedule(struct softnet_data *sd,
2605 struct napi_struct *napi)
2607 list_add_tail(&napi->poll_list, &sd->poll_list);
2608 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2612 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2613 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2614 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2615 * if hash is a canonical 4-tuple hash over transport ports.
2617 void __skb_get_rxhash(struct sk_buff *skb)
2619 struct flow_keys keys;
2622 if (!skb_flow_dissect(skb, &keys))
2626 if ((__force u16)keys.port16[1] < (__force u16)keys.port16[0])
2627 swap(keys.port16[0], keys.port16[1]);
2631 /* get a consistent hash (same value on both flow directions) */
2632 if ((__force u32)keys.dst < (__force u32)keys.src)
2633 swap(keys.dst, keys.src);
2635 hash = jhash_3words((__force u32)keys.dst,
2636 (__force u32)keys.src,
2637 (__force u32)keys.ports, hashrnd);
2643 EXPORT_SYMBOL(__skb_get_rxhash);
2647 /* One global table that all flow-based protocols share. */
2648 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2649 EXPORT_SYMBOL(rps_sock_flow_table);
2651 struct static_key rps_needed __read_mostly;
2653 static struct rps_dev_flow *
2654 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2655 struct rps_dev_flow *rflow, u16 next_cpu)
2657 if (next_cpu != RPS_NO_CPU) {
2658 #ifdef CONFIG_RFS_ACCEL
2659 struct netdev_rx_queue *rxqueue;
2660 struct rps_dev_flow_table *flow_table;
2661 struct rps_dev_flow *old_rflow;
2666 /* Should we steer this flow to a different hardware queue? */
2667 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2668 !(dev->features & NETIF_F_NTUPLE))
2670 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2671 if (rxq_index == skb_get_rx_queue(skb))
2674 rxqueue = dev->_rx + rxq_index;
2675 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2678 flow_id = skb->rxhash & flow_table->mask;
2679 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2680 rxq_index, flow_id);
2684 rflow = &flow_table->flows[flow_id];
2686 if (old_rflow->filter == rflow->filter)
2687 old_rflow->filter = RPS_NO_FILTER;
2691 per_cpu(softnet_data, next_cpu).input_queue_head;
2694 rflow->cpu = next_cpu;
2699 * get_rps_cpu is called from netif_receive_skb and returns the target
2700 * CPU from the RPS map of the receiving queue for a given skb.
2701 * rcu_read_lock must be held on entry.
2703 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2704 struct rps_dev_flow **rflowp)
2706 struct netdev_rx_queue *rxqueue;
2707 struct rps_map *map;
2708 struct rps_dev_flow_table *flow_table;
2709 struct rps_sock_flow_table *sock_flow_table;
2713 if (skb_rx_queue_recorded(skb)) {
2714 u16 index = skb_get_rx_queue(skb);
2715 if (unlikely(index >= dev->real_num_rx_queues)) {
2716 WARN_ONCE(dev->real_num_rx_queues > 1,
2717 "%s received packet on queue %u, but number "
2718 "of RX queues is %u\n",
2719 dev->name, index, dev->real_num_rx_queues);
2722 rxqueue = dev->_rx + index;
2726 map = rcu_dereference(rxqueue->rps_map);
2728 if (map->len == 1 &&
2729 !rcu_access_pointer(rxqueue->rps_flow_table)) {
2730 tcpu = map->cpus[0];
2731 if (cpu_online(tcpu))
2735 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2739 skb_reset_network_header(skb);
2740 if (!skb_get_rxhash(skb))
2743 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2744 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2745 if (flow_table && sock_flow_table) {
2747 struct rps_dev_flow *rflow;
2749 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2752 next_cpu = sock_flow_table->ents[skb->rxhash &
2753 sock_flow_table->mask];
2756 * If the desired CPU (where last recvmsg was done) is
2757 * different from current CPU (one in the rx-queue flow
2758 * table entry), switch if one of the following holds:
2759 * - Current CPU is unset (equal to RPS_NO_CPU).
2760 * - Current CPU is offline.
2761 * - The current CPU's queue tail has advanced beyond the
2762 * last packet that was enqueued using this table entry.
2763 * This guarantees that all previous packets for the flow
2764 * have been dequeued, thus preserving in order delivery.
2766 if (unlikely(tcpu != next_cpu) &&
2767 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2768 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2769 rflow->last_qtail)) >= 0))
2770 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2772 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2780 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2782 if (cpu_online(tcpu)) {
2792 #ifdef CONFIG_RFS_ACCEL
2795 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2796 * @dev: Device on which the filter was set
2797 * @rxq_index: RX queue index
2798 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2799 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2801 * Drivers that implement ndo_rx_flow_steer() should periodically call
2802 * this function for each installed filter and remove the filters for
2803 * which it returns %true.
2805 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2806 u32 flow_id, u16 filter_id)
2808 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2809 struct rps_dev_flow_table *flow_table;
2810 struct rps_dev_flow *rflow;
2815 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2816 if (flow_table && flow_id <= flow_table->mask) {
2817 rflow = &flow_table->flows[flow_id];
2818 cpu = ACCESS_ONCE(rflow->cpu);
2819 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2820 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2821 rflow->last_qtail) <
2822 (int)(10 * flow_table->mask)))
2828 EXPORT_SYMBOL(rps_may_expire_flow);
2830 #endif /* CONFIG_RFS_ACCEL */
2832 /* Called from hardirq (IPI) context */
2833 static void rps_trigger_softirq(void *data)
2835 struct softnet_data *sd = data;
2837 ____napi_schedule(sd, &sd->backlog);
2841 #endif /* CONFIG_RPS */
2844 * Check if this softnet_data structure is another cpu one
2845 * If yes, queue it to our IPI list and return 1
2848 static int rps_ipi_queued(struct softnet_data *sd)
2851 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2854 sd->rps_ipi_next = mysd->rps_ipi_list;
2855 mysd->rps_ipi_list = sd;
2857 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2860 #endif /* CONFIG_RPS */
2865 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2866 * queue (may be a remote CPU queue).
2868 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2869 unsigned int *qtail)
2871 struct softnet_data *sd;
2872 unsigned long flags;
2874 sd = &per_cpu(softnet_data, cpu);
2876 local_irq_save(flags);
2879 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2880 if (skb_queue_len(&sd->input_pkt_queue)) {
2882 __skb_queue_tail(&sd->input_pkt_queue, skb);
2883 input_queue_tail_incr_save(sd, qtail);
2885 local_irq_restore(flags);
2886 return NET_RX_SUCCESS;
2889 /* Schedule NAPI for backlog device
2890 * We can use non atomic operation since we own the queue lock
2892 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2893 if (!rps_ipi_queued(sd))
2894 ____napi_schedule(sd, &sd->backlog);
2902 local_irq_restore(flags);
2904 atomic_long_inc(&skb->dev->rx_dropped);
2910 * netif_rx - post buffer to the network code
2911 * @skb: buffer to post
2913 * This function receives a packet from a device driver and queues it for
2914 * the upper (protocol) levels to process. It always succeeds. The buffer
2915 * may be dropped during processing for congestion control or by the
2919 * NET_RX_SUCCESS (no congestion)
2920 * NET_RX_DROP (packet was dropped)
2924 int netif_rx(struct sk_buff *skb)
2928 /* if netpoll wants it, pretend we never saw it */
2929 if (netpoll_rx(skb))
2932 net_timestamp_check(netdev_tstamp_prequeue, skb);
2934 trace_netif_rx(skb);
2936 if (static_key_false(&rps_needed)) {
2937 struct rps_dev_flow voidflow, *rflow = &voidflow;
2943 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2945 cpu = smp_processor_id();
2947 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2955 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2960 EXPORT_SYMBOL(netif_rx);
2962 int netif_rx_ni(struct sk_buff *skb)
2967 err = netif_rx(skb);
2968 if (local_softirq_pending())
2974 EXPORT_SYMBOL(netif_rx_ni);
2976 static void net_tx_action(struct softirq_action *h)
2978 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2980 if (sd->completion_queue) {
2981 struct sk_buff *clist;
2983 local_irq_disable();
2984 clist = sd->completion_queue;
2985 sd->completion_queue = NULL;
2989 struct sk_buff *skb = clist;
2990 clist = clist->next;
2992 WARN_ON(atomic_read(&skb->users));
2993 trace_kfree_skb(skb, net_tx_action);
2998 if (sd->output_queue) {
3001 local_irq_disable();
3002 head = sd->output_queue;
3003 sd->output_queue = NULL;
3004 sd->output_queue_tailp = &sd->output_queue;
3008 struct Qdisc *q = head;
3009 spinlock_t *root_lock;
3011 head = head->next_sched;
3013 root_lock = qdisc_lock(q);
3014 if (spin_trylock(root_lock)) {
3015 smp_mb__before_clear_bit();
3016 clear_bit(__QDISC_STATE_SCHED,
3019 spin_unlock(root_lock);
3021 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3023 __netif_reschedule(q);
3025 smp_mb__before_clear_bit();
3026 clear_bit(__QDISC_STATE_SCHED,
3034 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3035 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3036 /* This hook is defined here for ATM LANE */
3037 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3038 unsigned char *addr) __read_mostly;
3039 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3042 #ifdef CONFIG_NET_CLS_ACT
3043 /* TODO: Maybe we should just force sch_ingress to be compiled in
3044 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3045 * a compare and 2 stores extra right now if we dont have it on
3046 * but have CONFIG_NET_CLS_ACT
3047 * NOTE: This doesn't stop any functionality; if you dont have
3048 * the ingress scheduler, you just can't add policies on ingress.
3051 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3053 struct net_device *dev = skb->dev;
3054 u32 ttl = G_TC_RTTL(skb->tc_verd);
3055 int result = TC_ACT_OK;
3058 if (unlikely(MAX_RED_LOOP < ttl++)) {
3059 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3060 skb->skb_iif, dev->ifindex);
3064 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3065 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3068 if (q != &noop_qdisc) {
3069 spin_lock(qdisc_lock(q));
3070 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3071 result = qdisc_enqueue_root(skb, q);
3072 spin_unlock(qdisc_lock(q));
3078 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3079 struct packet_type **pt_prev,
3080 int *ret, struct net_device *orig_dev)
3082 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3084 if (!rxq || rxq->qdisc == &noop_qdisc)
3088 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3092 switch (ing_filter(skb, rxq)) {
3106 * netdev_rx_handler_register - register receive handler
3107 * @dev: device to register a handler for
3108 * @rx_handler: receive handler to register
3109 * @rx_handler_data: data pointer that is used by rx handler
3111 * Register a receive hander for a device. This handler will then be
3112 * called from __netif_receive_skb. A negative errno code is returned
3115 * The caller must hold the rtnl_mutex.
3117 * For a general description of rx_handler, see enum rx_handler_result.
3119 int netdev_rx_handler_register(struct net_device *dev,
3120 rx_handler_func_t *rx_handler,
3121 void *rx_handler_data)
3125 if (dev->rx_handler)
3128 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3129 rcu_assign_pointer(dev->rx_handler, rx_handler);
3133 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3136 * netdev_rx_handler_unregister - unregister receive handler
3137 * @dev: device to unregister a handler from
3139 * Unregister a receive hander from a device.
3141 * The caller must hold the rtnl_mutex.
3143 void netdev_rx_handler_unregister(struct net_device *dev)
3147 RCU_INIT_POINTER(dev->rx_handler, NULL);
3148 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3150 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3152 static int __netif_receive_skb(struct sk_buff *skb)
3154 struct packet_type *ptype, *pt_prev;
3155 rx_handler_func_t *rx_handler;
3156 struct net_device *orig_dev;
3157 struct net_device *null_or_dev;
3158 bool deliver_exact = false;
3159 int ret = NET_RX_DROP;
3162 net_timestamp_check(!netdev_tstamp_prequeue, skb);
3164 trace_netif_receive_skb(skb);
3166 /* if we've gotten here through NAPI, check netpoll */
3167 if (netpoll_receive_skb(skb))
3171 skb->skb_iif = skb->dev->ifindex;
3172 orig_dev = skb->dev;
3174 skb_reset_network_header(skb);
3175 skb_reset_transport_header(skb);
3176 skb_reset_mac_len(skb);
3184 __this_cpu_inc(softnet_data.processed);
3186 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
3187 skb = vlan_untag(skb);
3192 #ifdef CONFIG_NET_CLS_ACT
3193 if (skb->tc_verd & TC_NCLS) {
3194 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3199 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3200 if (!ptype->dev || ptype->dev == skb->dev) {
3202 ret = deliver_skb(skb, pt_prev, orig_dev);
3207 #ifdef CONFIG_NET_CLS_ACT
3208 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3214 rx_handler = rcu_dereference(skb->dev->rx_handler);
3215 if (vlan_tx_tag_present(skb)) {
3217 ret = deliver_skb(skb, pt_prev, orig_dev);
3220 if (vlan_do_receive(&skb, !rx_handler))
3222 else if (unlikely(!skb))
3228 ret = deliver_skb(skb, pt_prev, orig_dev);
3231 switch (rx_handler(&skb)) {
3232 case RX_HANDLER_CONSUMED:
3234 case RX_HANDLER_ANOTHER:
3236 case RX_HANDLER_EXACT:
3237 deliver_exact = true;
3238 case RX_HANDLER_PASS:
3245 /* deliver only exact match when indicated */
3246 null_or_dev = deliver_exact ? skb->dev : NULL;
3248 type = skb->protocol;
3249 list_for_each_entry_rcu(ptype,
3250 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3251 if (ptype->type == type &&
3252 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3253 ptype->dev == orig_dev)) {
3255 ret = deliver_skb(skb, pt_prev, orig_dev);
3261 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3263 atomic_long_inc(&skb->dev->rx_dropped);
3265 /* Jamal, now you will not able to escape explaining
3266 * me how you were going to use this. :-)
3277 * netif_receive_skb - process receive buffer from network
3278 * @skb: buffer to process
3280 * netif_receive_skb() is the main receive data processing function.
3281 * It always succeeds. The buffer may be dropped during processing
3282 * for congestion control or by the protocol layers.
3284 * This function may only be called from softirq context and interrupts
3285 * should be enabled.
3287 * Return values (usually ignored):
3288 * NET_RX_SUCCESS: no congestion
3289 * NET_RX_DROP: packet was dropped
3291 int netif_receive_skb(struct sk_buff *skb)
3293 net_timestamp_check(netdev_tstamp_prequeue, skb);
3295 if (skb_defer_rx_timestamp(skb))
3296 return NET_RX_SUCCESS;
3299 if (static_key_false(&rps_needed)) {
3300 struct rps_dev_flow voidflow, *rflow = &voidflow;
3305 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3308 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3315 return __netif_receive_skb(skb);
3317 EXPORT_SYMBOL(netif_receive_skb);
3319 /* Network device is going away, flush any packets still pending
3320 * Called with irqs disabled.
3322 static void flush_backlog(void *arg)
3324 struct net_device *dev = arg;
3325 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3326 struct sk_buff *skb, *tmp;
3329 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3330 if (skb->dev == dev) {
3331 __skb_unlink(skb, &sd->input_pkt_queue);
3333 input_queue_head_incr(sd);
3338 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3339 if (skb->dev == dev) {
3340 __skb_unlink(skb, &sd->process_queue);
3342 input_queue_head_incr(sd);
3347 static int napi_gro_complete(struct sk_buff *skb)
3349 struct packet_type *ptype;
3350 __be16 type = skb->protocol;
3351 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3354 if (NAPI_GRO_CB(skb)->count == 1) {
3355 skb_shinfo(skb)->gso_size = 0;
3360 list_for_each_entry_rcu(ptype, head, list) {
3361 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3364 err = ptype->gro_complete(skb);
3370 WARN_ON(&ptype->list == head);
3372 return NET_RX_SUCCESS;
3376 return netif_receive_skb(skb);
3379 inline void napi_gro_flush(struct napi_struct *napi)
3381 struct sk_buff *skb, *next;
3383 for (skb = napi->gro_list; skb; skb = next) {
3386 napi_gro_complete(skb);
3389 napi->gro_count = 0;
3390 napi->gro_list = NULL;
3392 EXPORT_SYMBOL(napi_gro_flush);
3394 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3396 struct sk_buff **pp = NULL;
3397 struct packet_type *ptype;
3398 __be16 type = skb->protocol;
3399 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3402 enum gro_result ret;
3404 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3407 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3411 list_for_each_entry_rcu(ptype, head, list) {
3412 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3415 skb_set_network_header(skb, skb_gro_offset(skb));
3416 mac_len = skb->network_header - skb->mac_header;
3417 skb->mac_len = mac_len;
3418 NAPI_GRO_CB(skb)->same_flow = 0;
3419 NAPI_GRO_CB(skb)->flush = 0;
3420 NAPI_GRO_CB(skb)->free = 0;
3422 pp = ptype->gro_receive(&napi->gro_list, skb);
3427 if (&ptype->list == head)
3430 same_flow = NAPI_GRO_CB(skb)->same_flow;
3431 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3434 struct sk_buff *nskb = *pp;
3438 napi_gro_complete(nskb);
3445 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3449 NAPI_GRO_CB(skb)->count = 1;
3450 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3451 skb->next = napi->gro_list;
3452 napi->gro_list = skb;
3456 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3457 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3459 BUG_ON(skb->end - skb->tail < grow);
3461 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3464 skb->data_len -= grow;
3466 skb_shinfo(skb)->frags[0].page_offset += grow;
3467 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
3469 if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3470 skb_frag_unref(skb, 0);
3471 memmove(skb_shinfo(skb)->frags,
3472 skb_shinfo(skb)->frags + 1,
3473 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3484 EXPORT_SYMBOL(dev_gro_receive);
3486 static inline gro_result_t
3487 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3490 unsigned int maclen = skb->dev->hard_header_len;
3492 for (p = napi->gro_list; p; p = p->next) {
3493 unsigned long diffs;
3495 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3496 diffs |= p->vlan_tci ^ skb->vlan_tci;
3497 if (maclen == ETH_HLEN)
3498 diffs |= compare_ether_header(skb_mac_header(p),
3499 skb_gro_mac_header(skb));
3501 diffs = memcmp(skb_mac_header(p),
3502 skb_gro_mac_header(skb),
3504 NAPI_GRO_CB(p)->same_flow = !diffs;
3505 NAPI_GRO_CB(p)->flush = 0;
3508 return dev_gro_receive(napi, skb);
3511 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3515 if (netif_receive_skb(skb))
3523 case GRO_MERGED_FREE:
3524 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
3525 kmem_cache_free(skbuff_head_cache, skb);
3537 EXPORT_SYMBOL(napi_skb_finish);
3539 void skb_gro_reset_offset(struct sk_buff *skb)
3541 NAPI_GRO_CB(skb)->data_offset = 0;
3542 NAPI_GRO_CB(skb)->frag0 = NULL;
3543 NAPI_GRO_CB(skb)->frag0_len = 0;
3545 if (skb->mac_header == skb->tail &&
3546 !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
3547 NAPI_GRO_CB(skb)->frag0 =
3548 skb_frag_address(&skb_shinfo(skb)->frags[0]);
3549 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
3552 EXPORT_SYMBOL(skb_gro_reset_offset);
3554 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3556 skb_gro_reset_offset(skb);
3558 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3560 EXPORT_SYMBOL(napi_gro_receive);
3562 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3564 __skb_pull(skb, skb_headlen(skb));
3565 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3566 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
3568 skb->dev = napi->dev;
3574 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3576 struct sk_buff *skb = napi->skb;
3579 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3585 EXPORT_SYMBOL(napi_get_frags);
3587 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3593 skb->protocol = eth_type_trans(skb, skb->dev);
3595 if (ret == GRO_HELD)
3596 skb_gro_pull(skb, -ETH_HLEN);
3597 else if (netif_receive_skb(skb))
3602 case GRO_MERGED_FREE:
3603 napi_reuse_skb(napi, skb);
3612 EXPORT_SYMBOL(napi_frags_finish);
3614 static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3616 struct sk_buff *skb = napi->skb;
3623 skb_reset_mac_header(skb);
3624 skb_gro_reset_offset(skb);
3626 off = skb_gro_offset(skb);
3627 hlen = off + sizeof(*eth);
3628 eth = skb_gro_header_fast(skb, off);
3629 if (skb_gro_header_hard(skb, hlen)) {
3630 eth = skb_gro_header_slow(skb, hlen, off);
3631 if (unlikely(!eth)) {
3632 napi_reuse_skb(napi, skb);
3638 skb_gro_pull(skb, sizeof(*eth));
3641 * This works because the only protocols we care about don't require
3642 * special handling. We'll fix it up properly at the end.
3644 skb->protocol = eth->h_proto;
3650 gro_result_t napi_gro_frags(struct napi_struct *napi)
3652 struct sk_buff *skb = napi_frags_skb(napi);
3657 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3659 EXPORT_SYMBOL(napi_gro_frags);
3662 * net_rps_action sends any pending IPI's for rps.
3663 * Note: called with local irq disabled, but exits with local irq enabled.
3665 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3668 struct softnet_data *remsd = sd->rps_ipi_list;
3671 sd->rps_ipi_list = NULL;
3675 /* Send pending IPI's to kick RPS processing on remote cpus. */
3677 struct softnet_data *next = remsd->rps_ipi_next;
3679 if (cpu_online(remsd->cpu))
3680 __smp_call_function_single(remsd->cpu,
3689 static int process_backlog(struct napi_struct *napi, int quota)
3692 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3695 /* Check if we have pending ipi, its better to send them now,
3696 * not waiting net_rx_action() end.
3698 if (sd->rps_ipi_list) {
3699 local_irq_disable();
3700 net_rps_action_and_irq_enable(sd);
3703 napi->weight = weight_p;
3704 local_irq_disable();
3705 while (work < quota) {
3706 struct sk_buff *skb;
3709 while ((skb = __skb_dequeue(&sd->process_queue))) {
3711 __netif_receive_skb(skb);
3712 local_irq_disable();
3713 input_queue_head_incr(sd);
3714 if (++work >= quota) {
3721 qlen = skb_queue_len(&sd->input_pkt_queue);
3723 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3724 &sd->process_queue);
3726 if (qlen < quota - work) {
3728 * Inline a custom version of __napi_complete().
3729 * only current cpu owns and manipulates this napi,
3730 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3731 * we can use a plain write instead of clear_bit(),
3732 * and we dont need an smp_mb() memory barrier.
3734 list_del(&napi->poll_list);
3737 quota = work + qlen;
3747 * __napi_schedule - schedule for receive
3748 * @n: entry to schedule
3750 * The entry's receive function will be scheduled to run
3752 void __napi_schedule(struct napi_struct *n)
3754 unsigned long flags;
3756 local_irq_save(flags);
3757 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3758 local_irq_restore(flags);
3760 EXPORT_SYMBOL(__napi_schedule);
3762 void __napi_complete(struct napi_struct *n)
3764 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3765 BUG_ON(n->gro_list);
3767 list_del(&n->poll_list);
3768 smp_mb__before_clear_bit();
3769 clear_bit(NAPI_STATE_SCHED, &n->state);
3771 EXPORT_SYMBOL(__napi_complete);
3773 void napi_complete(struct napi_struct *n)
3775 unsigned long flags;
3778 * don't let napi dequeue from the cpu poll list
3779 * just in case its running on a different cpu
3781 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3785 local_irq_save(flags);
3787 local_irq_restore(flags);
3789 EXPORT_SYMBOL(napi_complete);
3791 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3792 int (*poll)(struct napi_struct *, int), int weight)
3794 INIT_LIST_HEAD(&napi->poll_list);
3795 napi->gro_count = 0;
3796 napi->gro_list = NULL;
3799 napi->weight = weight;
3800 list_add(&napi->dev_list, &dev->napi_list);
3802 #ifdef CONFIG_NETPOLL
3803 spin_lock_init(&napi->poll_lock);
3804 napi->poll_owner = -1;
3806 set_bit(NAPI_STATE_SCHED, &napi->state);
3808 EXPORT_SYMBOL(netif_napi_add);
3810 void netif_napi_del(struct napi_struct *napi)
3812 struct sk_buff *skb, *next;
3814 list_del_init(&napi->dev_list);
3815 napi_free_frags(napi);
3817 for (skb = napi->gro_list; skb; skb = next) {
3823 napi->gro_list = NULL;
3824 napi->gro_count = 0;
3826 EXPORT_SYMBOL(netif_napi_del);
3828 static void net_rx_action(struct softirq_action *h)
3830 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3831 unsigned long time_limit = jiffies + 2;
3832 int budget = netdev_budget;
3835 local_irq_disable();
3837 while (!list_empty(&sd->poll_list)) {
3838 struct napi_struct *n;
3841 /* If softirq window is exhuasted then punt.
3842 * Allow this to run for 2 jiffies since which will allow
3843 * an average latency of 1.5/HZ.
3845 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3850 /* Even though interrupts have been re-enabled, this
3851 * access is safe because interrupts can only add new
3852 * entries to the tail of this list, and only ->poll()
3853 * calls can remove this head entry from the list.
3855 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3857 have = netpoll_poll_lock(n);
3861 /* This NAPI_STATE_SCHED test is for avoiding a race
3862 * with netpoll's poll_napi(). Only the entity which
3863 * obtains the lock and sees NAPI_STATE_SCHED set will
3864 * actually make the ->poll() call. Therefore we avoid
3865 * accidentally calling ->poll() when NAPI is not scheduled.
3868 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3869 work = n->poll(n, weight);
3873 WARN_ON_ONCE(work > weight);
3877 local_irq_disable();
3879 /* Drivers must not modify the NAPI state if they
3880 * consume the entire weight. In such cases this code
3881 * still "owns" the NAPI instance and therefore can
3882 * move the instance around on the list at-will.
3884 if (unlikely(work == weight)) {
3885 if (unlikely(napi_disable_pending(n))) {
3888 local_irq_disable();
3890 list_move_tail(&n->poll_list, &sd->poll_list);
3893 netpoll_poll_unlock(have);
3896 net_rps_action_and_irq_enable(sd);
3898 #ifdef CONFIG_NET_DMA
3900 * There may not be any more sk_buffs coming right now, so push
3901 * any pending DMA copies to hardware
3903 dma_issue_pending_all();
3910 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3914 static gifconf_func_t *gifconf_list[NPROTO];
3917 * register_gifconf - register a SIOCGIF handler
3918 * @family: Address family
3919 * @gifconf: Function handler
3921 * Register protocol dependent address dumping routines. The handler
3922 * that is passed must not be freed or reused until it has been replaced
3923 * by another handler.
3925 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3927 if (family >= NPROTO)
3929 gifconf_list[family] = gifconf;
3932 EXPORT_SYMBOL(register_gifconf);
3936 * Map an interface index to its name (SIOCGIFNAME)
3940 * We need this ioctl for efficient implementation of the
3941 * if_indextoname() function required by the IPv6 API. Without
3942 * it, we would have to search all the interfaces to find a
3946 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3948 struct net_device *dev;
3952 * Fetch the caller's info block.
3955 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3959 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3965 strcpy(ifr.ifr_name, dev->name);
3968 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3974 * Perform a SIOCGIFCONF call. This structure will change
3975 * size eventually, and there is nothing I can do about it.
3976 * Thus we will need a 'compatibility mode'.
3979 static int dev_ifconf(struct net *net, char __user *arg)
3982 struct net_device *dev;
3989 * Fetch the caller's info block.
3992 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3999 * Loop over the interfaces, and write an info block for each.
4003 for_each_netdev(net, dev) {
4004 for (i = 0; i < NPROTO; i++) {
4005 if (gifconf_list[i]) {
4008 done = gifconf_list[i](dev, NULL, 0);
4010 done = gifconf_list[i](dev, pos + total,
4020 * All done. Write the updated control block back to the caller.
4022 ifc.ifc_len = total;
4025 * Both BSD and Solaris return 0 here, so we do too.
4027 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
4030 #ifdef CONFIG_PROC_FS
4032 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4034 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4035 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4036 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4038 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
4040 struct net *net = seq_file_net(seq);
4041 struct net_device *dev;
4042 struct hlist_node *p;
4043 struct hlist_head *h;
4044 unsigned int count = 0, offset = get_offset(*pos);
4046 h = &net->dev_name_head[get_bucket(*pos)];
4047 hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
4048 if (++count == offset)
4055 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
4057 struct net_device *dev;
4058 unsigned int bucket;
4061 dev = dev_from_same_bucket(seq, pos);
4065 bucket = get_bucket(*pos) + 1;
4066 *pos = set_bucket_offset(bucket, 1);
4067 } while (bucket < NETDEV_HASHENTRIES);
4073 * This is invoked by the /proc filesystem handler to display a device
4076 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4081 return SEQ_START_TOKEN;
4083 if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
4086 return dev_from_bucket(seq, pos);
4089 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4092 return dev_from_bucket(seq, pos);
4095 void dev_seq_stop(struct seq_file *seq, void *v)
4101 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4103 struct rtnl_link_stats64 temp;
4104 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4106 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4107 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4108 dev->name, stats->rx_bytes, stats->rx_packets,
4110 stats->rx_dropped + stats->rx_missed_errors,
4111 stats->rx_fifo_errors,
4112 stats->rx_length_errors + stats->rx_over_errors +
4113 stats->rx_crc_errors + stats->rx_frame_errors,
4114 stats->rx_compressed, stats->multicast,
4115 stats->tx_bytes, stats->tx_packets,
4116 stats->tx_errors, stats->tx_dropped,
4117 stats->tx_fifo_errors, stats->collisions,
4118 stats->tx_carrier_errors +
4119 stats->tx_aborted_errors +
4120 stats->tx_window_errors +
4121 stats->tx_heartbeat_errors,
4122 stats->tx_compressed);
4126 * Called from the PROCfs module. This now uses the new arbitrary sized
4127 * /proc/net interface to create /proc/net/dev
4129 static int dev_seq_show(struct seq_file *seq, void *v)
4131 if (v == SEQ_START_TOKEN)
4132 seq_puts(seq, "Inter-| Receive "
4134 " face |bytes packets errs drop fifo frame "
4135 "compressed multicast|bytes packets errs "
4136 "drop fifo colls carrier compressed\n");
4138 dev_seq_printf_stats(seq, v);
4142 static struct softnet_data *softnet_get_online(loff_t *pos)
4144 struct softnet_data *sd = NULL;
4146 while (*pos < nr_cpu_ids)
4147 if (cpu_online(*pos)) {
4148 sd = &per_cpu(softnet_data, *pos);
4155 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4157 return softnet_get_online(pos);
4160 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4163 return softnet_get_online(pos);
4166 static void softnet_seq_stop(struct seq_file *seq, void *v)
4170 static int softnet_seq_show(struct seq_file *seq, void *v)
4172 struct softnet_data *sd = v;
4174 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4175 sd->processed, sd->dropped, sd->time_squeeze, 0,
4176 0, 0, 0, 0, /* was fastroute */
4177 sd->cpu_collision, sd->received_rps);
4181 static const struct seq_operations dev_seq_ops = {
4182 .start = dev_seq_start,
4183 .next = dev_seq_next,
4184 .stop = dev_seq_stop,
4185 .show = dev_seq_show,
4188 static int dev_seq_open(struct inode *inode, struct file *file)
4190 return seq_open_net(inode, file, &dev_seq_ops,
4191 sizeof(struct seq_net_private));
4194 static const struct file_operations dev_seq_fops = {
4195 .owner = THIS_MODULE,
4196 .open = dev_seq_open,
4198 .llseek = seq_lseek,
4199 .release = seq_release_net,
4202 static const struct seq_operations softnet_seq_ops = {
4203 .start = softnet_seq_start,
4204 .next = softnet_seq_next,
4205 .stop = softnet_seq_stop,
4206 .show = softnet_seq_show,
4209 static int softnet_seq_open(struct inode *inode, struct file *file)
4211 return seq_open(file, &softnet_seq_ops);
4214 static const struct file_operations softnet_seq_fops = {
4215 .owner = THIS_MODULE,
4216 .open = softnet_seq_open,
4218 .llseek = seq_lseek,
4219 .release = seq_release,
4222 static void *ptype_get_idx(loff_t pos)
4224 struct packet_type *pt = NULL;
4228 list_for_each_entry_rcu(pt, &ptype_all, list) {
4234 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4235 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4244 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4248 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4251 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4253 struct packet_type *pt;
4254 struct list_head *nxt;
4258 if (v == SEQ_START_TOKEN)
4259 return ptype_get_idx(0);
4262 nxt = pt->list.next;
4263 if (pt->type == htons(ETH_P_ALL)) {
4264 if (nxt != &ptype_all)
4267 nxt = ptype_base[0].next;
4269 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4271 while (nxt == &ptype_base[hash]) {
4272 if (++hash >= PTYPE_HASH_SIZE)
4274 nxt = ptype_base[hash].next;
4277 return list_entry(nxt, struct packet_type, list);
4280 static void ptype_seq_stop(struct seq_file *seq, void *v)
4286 static int ptype_seq_show(struct seq_file *seq, void *v)
4288 struct packet_type *pt = v;
4290 if (v == SEQ_START_TOKEN)
4291 seq_puts(seq, "Type Device Function\n");
4292 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4293 if (pt->type == htons(ETH_P_ALL))
4294 seq_puts(seq, "ALL ");
4296 seq_printf(seq, "%04x", ntohs(pt->type));
4298 seq_printf(seq, " %-8s %pF\n",
4299 pt->dev ? pt->dev->name : "", pt->func);
4305 static const struct seq_operations ptype_seq_ops = {
4306 .start = ptype_seq_start,
4307 .next = ptype_seq_next,
4308 .stop = ptype_seq_stop,
4309 .show = ptype_seq_show,
4312 static int ptype_seq_open(struct inode *inode, struct file *file)
4314 return seq_open_net(inode, file, &ptype_seq_ops,
4315 sizeof(struct seq_net_private));
4318 static const struct file_operations ptype_seq_fops = {
4319 .owner = THIS_MODULE,
4320 .open = ptype_seq_open,
4322 .llseek = seq_lseek,
4323 .release = seq_release_net,
4327 static int __net_init dev_proc_net_init(struct net *net)
4331 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4333 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4335 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4338 if (wext_proc_init(net))
4344 proc_net_remove(net, "ptype");
4346 proc_net_remove(net, "softnet_stat");
4348 proc_net_remove(net, "dev");
4352 static void __net_exit dev_proc_net_exit(struct net *net)
4354 wext_proc_exit(net);
4356 proc_net_remove(net, "ptype");
4357 proc_net_remove(net, "softnet_stat");
4358 proc_net_remove(net, "dev");
4361 static struct pernet_operations __net_initdata dev_proc_ops = {
4362 .init = dev_proc_net_init,
4363 .exit = dev_proc_net_exit,
4366 static int __init dev_proc_init(void)
4368 return register_pernet_subsys(&dev_proc_ops);
4371 #define dev_proc_init() 0
4372 #endif /* CONFIG_PROC_FS */
4376 * netdev_set_master - set up master pointer
4377 * @slave: slave device
4378 * @master: new master device
4380 * Changes the master device of the slave. Pass %NULL to break the
4381 * bonding. The caller must hold the RTNL semaphore. On a failure
4382 * a negative errno code is returned. On success the reference counts
4383 * are adjusted and the function returns zero.
4385 int netdev_set_master(struct net_device *slave, struct net_device *master)
4387 struct net_device *old = slave->master;
4397 slave->master = master;
4403 EXPORT_SYMBOL(netdev_set_master);
4406 * netdev_set_bond_master - set up bonding master/slave pair
4407 * @slave: slave device
4408 * @master: new master device
4410 * Changes the master device of the slave. Pass %NULL to break the
4411 * bonding. The caller must hold the RTNL semaphore. On a failure
4412 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4413 * to the routing socket and the function returns zero.
4415 int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
4421 err = netdev_set_master(slave, master);
4425 slave->flags |= IFF_SLAVE;
4427 slave->flags &= ~IFF_SLAVE;
4429 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4432 EXPORT_SYMBOL(netdev_set_bond_master);
4434 static void dev_change_rx_flags(struct net_device *dev, int flags)
4436 const struct net_device_ops *ops = dev->netdev_ops;
4438 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4439 ops->ndo_change_rx_flags(dev, flags);
4442 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4444 unsigned int old_flags = dev->flags;
4450 dev->flags |= IFF_PROMISC;
4451 dev->promiscuity += inc;
4452 if (dev->promiscuity == 0) {
4455 * If inc causes overflow, untouch promisc and return error.
4458 dev->flags &= ~IFF_PROMISC;
4460 dev->promiscuity -= inc;
4461 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
4466 if (dev->flags != old_flags) {
4467 pr_info("device %s %s promiscuous mode\n",
4469 dev->flags & IFF_PROMISC ? "entered" : "left");
4470 if (audit_enabled) {
4471 current_uid_gid(&uid, &gid);
4472 audit_log(current->audit_context, GFP_ATOMIC,
4473 AUDIT_ANOM_PROMISCUOUS,
4474 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4475 dev->name, (dev->flags & IFF_PROMISC),
4476 (old_flags & IFF_PROMISC),
4477 audit_get_loginuid(current),
4479 audit_get_sessionid(current));
4482 dev_change_rx_flags(dev, IFF_PROMISC);
4488 * dev_set_promiscuity - update promiscuity count on a device
4492 * Add or remove promiscuity from a device. While the count in the device
4493 * remains above zero the interface remains promiscuous. Once it hits zero
4494 * the device reverts back to normal filtering operation. A negative inc
4495 * value is used to drop promiscuity on the device.
4496 * Return 0 if successful or a negative errno code on error.
4498 int dev_set_promiscuity(struct net_device *dev, int inc)
4500 unsigned int old_flags = dev->flags;
4503 err = __dev_set_promiscuity(dev, inc);
4506 if (dev->flags != old_flags)
4507 dev_set_rx_mode(dev);
4510 EXPORT_SYMBOL(dev_set_promiscuity);
4513 * dev_set_allmulti - update allmulti count on a device
4517 * Add or remove reception of all multicast frames to a device. While the
4518 * count in the device remains above zero the interface remains listening
4519 * to all interfaces. Once it hits zero the device reverts back to normal
4520 * filtering operation. A negative @inc value is used to drop the counter
4521 * when releasing a resource needing all multicasts.
4522 * Return 0 if successful or a negative errno code on error.
4525 int dev_set_allmulti(struct net_device *dev, int inc)
4527 unsigned int old_flags = dev->flags;
4531 dev->flags |= IFF_ALLMULTI;
4532 dev->allmulti += inc;
4533 if (dev->allmulti == 0) {
4536 * If inc causes overflow, untouch allmulti and return error.
4539 dev->flags &= ~IFF_ALLMULTI;
4541 dev->allmulti -= inc;
4542 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
4547 if (dev->flags ^ old_flags) {
4548 dev_change_rx_flags(dev, IFF_ALLMULTI);
4549 dev_set_rx_mode(dev);
4553 EXPORT_SYMBOL(dev_set_allmulti);
4556 * Upload unicast and multicast address lists to device and
4557 * configure RX filtering. When the device doesn't support unicast
4558 * filtering it is put in promiscuous mode while unicast addresses
4561 void __dev_set_rx_mode(struct net_device *dev)
4563 const struct net_device_ops *ops = dev->netdev_ops;
4565 /* dev_open will call this function so the list will stay sane. */
4566 if (!(dev->flags&IFF_UP))
4569 if (!netif_device_present(dev))
4572 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4573 /* Unicast addresses changes may only happen under the rtnl,
4574 * therefore calling __dev_set_promiscuity here is safe.
4576 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4577 __dev_set_promiscuity(dev, 1);
4578 dev->uc_promisc = true;
4579 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4580 __dev_set_promiscuity(dev, -1);
4581 dev->uc_promisc = false;
4585 if (ops->ndo_set_rx_mode)
4586 ops->ndo_set_rx_mode(dev);
4589 void dev_set_rx_mode(struct net_device *dev)
4591 netif_addr_lock_bh(dev);
4592 __dev_set_rx_mode(dev);
4593 netif_addr_unlock_bh(dev);
4597 * dev_get_flags - get flags reported to userspace
4600 * Get the combination of flag bits exported through APIs to userspace.
4602 unsigned int dev_get_flags(const struct net_device *dev)
4606 flags = (dev->flags & ~(IFF_PROMISC |
4611 (dev->gflags & (IFF_PROMISC |
4614 if (netif_running(dev)) {
4615 if (netif_oper_up(dev))
4616 flags |= IFF_RUNNING;
4617 if (netif_carrier_ok(dev))
4618 flags |= IFF_LOWER_UP;
4619 if (netif_dormant(dev))
4620 flags |= IFF_DORMANT;
4625 EXPORT_SYMBOL(dev_get_flags);
4627 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4629 unsigned int old_flags = dev->flags;
4635 * Set the flags on our device.
4638 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4639 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4641 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4645 * Load in the correct multicast list now the flags have changed.
4648 if ((old_flags ^ flags) & IFF_MULTICAST)
4649 dev_change_rx_flags(dev, IFF_MULTICAST);
4651 dev_set_rx_mode(dev);
4654 * Have we downed the interface. We handle IFF_UP ourselves
4655 * according to user attempts to set it, rather than blindly
4660 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4661 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4664 dev_set_rx_mode(dev);
4667 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4668 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4670 dev->gflags ^= IFF_PROMISC;
4671 dev_set_promiscuity(dev, inc);
4674 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4675 is important. Some (broken) drivers set IFF_PROMISC, when
4676 IFF_ALLMULTI is requested not asking us and not reporting.
4678 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4679 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4681 dev->gflags ^= IFF_ALLMULTI;
4682 dev_set_allmulti(dev, inc);
4688 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4690 unsigned int changes = dev->flags ^ old_flags;
4692 if (changes & IFF_UP) {
4693 if (dev->flags & IFF_UP)
4694 call_netdevice_notifiers(NETDEV_UP, dev);
4696 call_netdevice_notifiers(NETDEV_DOWN, dev);
4699 if (dev->flags & IFF_UP &&
4700 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4701 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4705 * dev_change_flags - change device settings
4707 * @flags: device state flags
4709 * Change settings on device based state flags. The flags are
4710 * in the userspace exported format.
4712 int dev_change_flags(struct net_device *dev, unsigned int flags)
4715 unsigned int changes, old_flags = dev->flags;
4717 ret = __dev_change_flags(dev, flags);
4721 changes = old_flags ^ dev->flags;
4723 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4725 __dev_notify_flags(dev, old_flags);
4728 EXPORT_SYMBOL(dev_change_flags);
4731 * dev_set_mtu - Change maximum transfer unit
4733 * @new_mtu: new transfer unit
4735 * Change the maximum transfer size of the network device.
4737 int dev_set_mtu(struct net_device *dev, int new_mtu)
4739 const struct net_device_ops *ops = dev->netdev_ops;
4742 if (new_mtu == dev->mtu)
4745 /* MTU must be positive. */
4749 if (!netif_device_present(dev))
4753 if (ops->ndo_change_mtu)
4754 err = ops->ndo_change_mtu(dev, new_mtu);
4758 if (!err && dev->flags & IFF_UP)
4759 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4762 EXPORT_SYMBOL(dev_set_mtu);
4765 * dev_set_group - Change group this device belongs to
4767 * @new_group: group this device should belong to
4769 void dev_set_group(struct net_device *dev, int new_group)
4771 dev->group = new_group;
4773 EXPORT_SYMBOL(dev_set_group);
4776 * dev_set_mac_address - Change Media Access Control Address
4780 * Change the hardware (MAC) address of the device
4782 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4784 const struct net_device_ops *ops = dev->netdev_ops;
4787 if (!ops->ndo_set_mac_address)
4789 if (sa->sa_family != dev->type)
4791 if (!netif_device_present(dev))
4793 err = ops->ndo_set_mac_address(dev, sa);
4795 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4798 EXPORT_SYMBOL(dev_set_mac_address);
4801 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4803 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4806 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4812 case SIOCGIFFLAGS: /* Get interface flags */
4813 ifr->ifr_flags = (short) dev_get_flags(dev);
4816 case SIOCGIFMETRIC: /* Get the metric on the interface
4817 (currently unused) */
4818 ifr->ifr_metric = 0;
4821 case SIOCGIFMTU: /* Get the MTU of a device */
4822 ifr->ifr_mtu = dev->mtu;
4827 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4829 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4830 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4831 ifr->ifr_hwaddr.sa_family = dev->type;
4839 ifr->ifr_map.mem_start = dev->mem_start;
4840 ifr->ifr_map.mem_end = dev->mem_end;
4841 ifr->ifr_map.base_addr = dev->base_addr;
4842 ifr->ifr_map.irq = dev->irq;
4843 ifr->ifr_map.dma = dev->dma;
4844 ifr->ifr_map.port = dev->if_port;
4848 ifr->ifr_ifindex = dev->ifindex;
4852 ifr->ifr_qlen = dev->tx_queue_len;
4856 /* dev_ioctl() should ensure this case
4868 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4870 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4873 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4874 const struct net_device_ops *ops;
4879 ops = dev->netdev_ops;
4882 case SIOCSIFFLAGS: /* Set interface flags */
4883 return dev_change_flags(dev, ifr->ifr_flags);
4885 case SIOCSIFMETRIC: /* Set the metric on the interface
4886 (currently unused) */
4889 case SIOCSIFMTU: /* Set the MTU of a device */
4890 return dev_set_mtu(dev, ifr->ifr_mtu);
4893 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4895 case SIOCSIFHWBROADCAST:
4896 if (ifr->ifr_hwaddr.sa_family != dev->type)
4898 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4899 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4900 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4904 if (ops->ndo_set_config) {
4905 if (!netif_device_present(dev))
4907 return ops->ndo_set_config(dev, &ifr->ifr_map);
4912 if (!ops->ndo_set_rx_mode ||
4913 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4915 if (!netif_device_present(dev))
4917 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4920 if (!ops->ndo_set_rx_mode ||
4921 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4923 if (!netif_device_present(dev))
4925 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4928 if (ifr->ifr_qlen < 0)
4930 dev->tx_queue_len = ifr->ifr_qlen;
4934 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4935 return dev_change_name(dev, ifr->ifr_newname);
4938 err = net_hwtstamp_validate(ifr);
4944 * Unknown or private ioctl
4947 if ((cmd >= SIOCDEVPRIVATE &&
4948 cmd <= SIOCDEVPRIVATE + 15) ||
4949 cmd == SIOCBONDENSLAVE ||
4950 cmd == SIOCBONDRELEASE ||
4951 cmd == SIOCBONDSETHWADDR ||
4952 cmd == SIOCBONDSLAVEINFOQUERY ||
4953 cmd == SIOCBONDINFOQUERY ||
4954 cmd == SIOCBONDCHANGEACTIVE ||
4955 cmd == SIOCGMIIPHY ||
4956 cmd == SIOCGMIIREG ||
4957 cmd == SIOCSMIIREG ||
4958 cmd == SIOCBRADDIF ||
4959 cmd == SIOCBRDELIF ||
4960 cmd == SIOCSHWTSTAMP ||
4961 cmd == SIOCWANDEV) {
4963 if (ops->ndo_do_ioctl) {
4964 if (netif_device_present(dev))
4965 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4977 * This function handles all "interface"-type I/O control requests. The actual
4978 * 'doing' part of this is dev_ifsioc above.
4982 * dev_ioctl - network device ioctl
4983 * @net: the applicable net namespace
4984 * @cmd: command to issue
4985 * @arg: pointer to a struct ifreq in user space
4987 * Issue ioctl functions to devices. This is normally called by the
4988 * user space syscall interfaces but can sometimes be useful for
4989 * other purposes. The return value is the return from the syscall if
4990 * positive or a negative errno code on error.
4993 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4999 /* One special case: SIOCGIFCONF takes ifconf argument
5000 and requires shared lock, because it sleeps writing
5004 if (cmd == SIOCGIFCONF) {
5006 ret = dev_ifconf(net, (char __user *) arg);
5010 if (cmd == SIOCGIFNAME)
5011 return dev_ifname(net, (struct ifreq __user *)arg);
5013 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
5016 ifr.ifr_name[IFNAMSIZ-1] = 0;
5018 colon = strchr(ifr.ifr_name, ':');
5023 * See which interface the caller is talking about.
5028 * These ioctl calls:
5029 * - can be done by all.
5030 * - atomic and do not require locking.
5041 dev_load(net, ifr.ifr_name);
5043 ret = dev_ifsioc_locked(net, &ifr, cmd);
5048 if (copy_to_user(arg, &ifr,
5049 sizeof(struct ifreq)))
5055 dev_load(net, ifr.ifr_name);
5057 ret = dev_ethtool(net, &ifr);
5062 if (copy_to_user(arg, &ifr,
5063 sizeof(struct ifreq)))
5069 * These ioctl calls:
5070 * - require superuser power.
5071 * - require strict serialization.
5077 if (!capable(CAP_NET_ADMIN))
5079 dev_load(net, ifr.ifr_name);
5081 ret = dev_ifsioc(net, &ifr, cmd);
5086 if (copy_to_user(arg, &ifr,
5087 sizeof(struct ifreq)))
5093 * These ioctl calls:
5094 * - require superuser power.
5095 * - require strict serialization.
5096 * - do not return a value
5106 case SIOCSIFHWBROADCAST:
5109 case SIOCBONDENSLAVE:
5110 case SIOCBONDRELEASE:
5111 case SIOCBONDSETHWADDR:
5112 case SIOCBONDCHANGEACTIVE:
5116 if (!capable(CAP_NET_ADMIN))
5119 case SIOCBONDSLAVEINFOQUERY:
5120 case SIOCBONDINFOQUERY:
5121 dev_load(net, ifr.ifr_name);
5123 ret = dev_ifsioc(net, &ifr, cmd);
5128 /* Get the per device memory space. We can add this but
5129 * currently do not support it */
5131 /* Set the per device memory buffer space.
5132 * Not applicable in our case */
5137 * Unknown or private ioctl.
5140 if (cmd == SIOCWANDEV ||
5141 (cmd >= SIOCDEVPRIVATE &&
5142 cmd <= SIOCDEVPRIVATE + 15)) {
5143 dev_load(net, ifr.ifr_name);
5145 ret = dev_ifsioc(net, &ifr, cmd);
5147 if (!ret && copy_to_user(arg, &ifr,
5148 sizeof(struct ifreq)))
5152 /* Take care of Wireless Extensions */
5153 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5154 return wext_handle_ioctl(net, &ifr, cmd, arg);
5161 * dev_new_index - allocate an ifindex
5162 * @net: the applicable net namespace
5164 * Returns a suitable unique value for a new device interface
5165 * number. The caller must hold the rtnl semaphore or the
5166 * dev_base_lock to be sure it remains unique.
5168 static int dev_new_index(struct net *net)
5174 if (!__dev_get_by_index(net, ifindex))
5179 /* Delayed registration/unregisteration */
5180 static LIST_HEAD(net_todo_list);
5182 static void net_set_todo(struct net_device *dev)
5184 list_add_tail(&dev->todo_list, &net_todo_list);
5187 static void rollback_registered_many(struct list_head *head)
5189 struct net_device *dev, *tmp;
5191 BUG_ON(dev_boot_phase);
5194 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5195 /* Some devices call without registering
5196 * for initialization unwind. Remove those
5197 * devices and proceed with the remaining.
5199 if (dev->reg_state == NETREG_UNINITIALIZED) {
5200 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5204 list_del(&dev->unreg_list);
5207 dev->dismantle = true;
5208 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5211 /* If device is running, close it first. */
5212 dev_close_many(head);
5214 list_for_each_entry(dev, head, unreg_list) {
5215 /* And unlink it from device chain. */
5216 unlist_netdevice(dev);
5218 dev->reg_state = NETREG_UNREGISTERING;
5223 list_for_each_entry(dev, head, unreg_list) {
5224 /* Shutdown queueing discipline. */
5228 /* Notify protocols, that we are about to destroy
5229 this device. They should clean all the things.
5231 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5233 if (!dev->rtnl_link_ops ||
5234 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5235 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5238 * Flush the unicast and multicast chains
5243 if (dev->netdev_ops->ndo_uninit)
5244 dev->netdev_ops->ndo_uninit(dev);
5246 /* Notifier chain MUST detach us from master device. */
5247 WARN_ON(dev->master);
5249 /* Remove entries from kobject tree */
5250 netdev_unregister_kobject(dev);
5253 /* Process any work delayed until the end of the batch */
5254 dev = list_first_entry(head, struct net_device, unreg_list);
5255 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5259 list_for_each_entry(dev, head, unreg_list)
5263 static void rollback_registered(struct net_device *dev)
5267 list_add(&dev->unreg_list, &single);
5268 rollback_registered_many(&single);
5272 static netdev_features_t netdev_fix_features(struct net_device *dev,
5273 netdev_features_t features)
5275 /* Fix illegal checksum combinations */
5276 if ((features & NETIF_F_HW_CSUM) &&
5277 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5278 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5279 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5282 /* Fix illegal SG+CSUM combinations. */
5283 if ((features & NETIF_F_SG) &&
5284 !(features & NETIF_F_ALL_CSUM)) {
5286 "Dropping NETIF_F_SG since no checksum feature.\n");
5287 features &= ~NETIF_F_SG;
5290 /* TSO requires that SG is present as well. */
5291 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5292 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5293 features &= ~NETIF_F_ALL_TSO;
5296 /* TSO ECN requires that TSO is present as well. */
5297 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5298 features &= ~NETIF_F_TSO_ECN;
5300 /* Software GSO depends on SG. */
5301 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5302 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5303 features &= ~NETIF_F_GSO;
5306 /* UFO needs SG and checksumming */
5307 if (features & NETIF_F_UFO) {
5308 /* maybe split UFO into V4 and V6? */
5309 if (!((features & NETIF_F_GEN_CSUM) ||
5310 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5311 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5313 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5314 features &= ~NETIF_F_UFO;
5317 if (!(features & NETIF_F_SG)) {
5319 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5320 features &= ~NETIF_F_UFO;
5327 int __netdev_update_features(struct net_device *dev)
5329 netdev_features_t features;
5334 features = netdev_get_wanted_features(dev);
5336 if (dev->netdev_ops->ndo_fix_features)
5337 features = dev->netdev_ops->ndo_fix_features(dev, features);
5339 /* driver might be less strict about feature dependencies */
5340 features = netdev_fix_features(dev, features);
5342 if (dev->features == features)
5345 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
5346 &dev->features, &features);
5348 if (dev->netdev_ops->ndo_set_features)
5349 err = dev->netdev_ops->ndo_set_features(dev, features);
5351 if (unlikely(err < 0)) {
5353 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5354 err, &features, &dev->features);
5359 dev->features = features;
5365 * netdev_update_features - recalculate device features
5366 * @dev: the device to check
5368 * Recalculate dev->features set and send notifications if it
5369 * has changed. Should be called after driver or hardware dependent
5370 * conditions might have changed that influence the features.
5372 void netdev_update_features(struct net_device *dev)
5374 if (__netdev_update_features(dev))
5375 netdev_features_change(dev);
5377 EXPORT_SYMBOL(netdev_update_features);
5380 * netdev_change_features - recalculate device features
5381 * @dev: the device to check
5383 * Recalculate dev->features set and send notifications even
5384 * if they have not changed. Should be called instead of
5385 * netdev_update_features() if also dev->vlan_features might
5386 * have changed to allow the changes to be propagated to stacked
5389 void netdev_change_features(struct net_device *dev)
5391 __netdev_update_features(dev);
5392 netdev_features_change(dev);
5394 EXPORT_SYMBOL(netdev_change_features);
5397 * netif_stacked_transfer_operstate - transfer operstate
5398 * @rootdev: the root or lower level device to transfer state from
5399 * @dev: the device to transfer operstate to
5401 * Transfer operational state from root to device. This is normally
5402 * called when a stacking relationship exists between the root
5403 * device and the device(a leaf device).
5405 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5406 struct net_device *dev)
5408 if (rootdev->operstate == IF_OPER_DORMANT)
5409 netif_dormant_on(dev);
5411 netif_dormant_off(dev);
5413 if (netif_carrier_ok(rootdev)) {
5414 if (!netif_carrier_ok(dev))
5415 netif_carrier_on(dev);
5417 if (netif_carrier_ok(dev))
5418 netif_carrier_off(dev);
5421 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5424 static int netif_alloc_rx_queues(struct net_device *dev)
5426 unsigned int i, count = dev->num_rx_queues;
5427 struct netdev_rx_queue *rx;
5431 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5433 pr_err("netdev: Unable to allocate %u rx queues\n", count);
5438 for (i = 0; i < count; i++)
5444 static void netdev_init_one_queue(struct net_device *dev,
5445 struct netdev_queue *queue, void *_unused)
5447 /* Initialize queue lock */
5448 spin_lock_init(&queue->_xmit_lock);
5449 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5450 queue->xmit_lock_owner = -1;
5451 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5454 dql_init(&queue->dql, HZ);
5458 static int netif_alloc_netdev_queues(struct net_device *dev)
5460 unsigned int count = dev->num_tx_queues;
5461 struct netdev_queue *tx;
5465 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5467 pr_err("netdev: Unable to allocate %u tx queues\n", count);
5472 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5473 spin_lock_init(&dev->tx_global_lock);
5479 * register_netdevice - register a network device
5480 * @dev: device to register
5482 * Take a completed network device structure and add it to the kernel
5483 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5484 * chain. 0 is returned on success. A negative errno code is returned
5485 * on a failure to set up the device, or if the name is a duplicate.
5487 * Callers must hold the rtnl semaphore. You may want
5488 * register_netdev() instead of this.
5491 * The locking appears insufficient to guarantee two parallel registers
5492 * will not get the same name.
5495 int register_netdevice(struct net_device *dev)
5498 struct net *net = dev_net(dev);
5500 BUG_ON(dev_boot_phase);
5505 /* When net_device's are persistent, this will be fatal. */
5506 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5509 spin_lock_init(&dev->addr_list_lock);
5510 netdev_set_addr_lockdep_class(dev);
5514 ret = dev_get_valid_name(dev, dev->name);
5518 /* Init, if this function is available */
5519 if (dev->netdev_ops->ndo_init) {
5520 ret = dev->netdev_ops->ndo_init(dev);
5528 dev->ifindex = dev_new_index(net);
5529 if (dev->iflink == -1)
5530 dev->iflink = dev->ifindex;
5532 /* Transfer changeable features to wanted_features and enable
5533 * software offloads (GSO and GRO).
5535 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5536 dev->features |= NETIF_F_SOFT_FEATURES;
5537 dev->wanted_features = dev->features & dev->hw_features;
5539 /* Turn on no cache copy if HW is doing checksum */
5540 if (!(dev->flags & IFF_LOOPBACK)) {
5541 dev->hw_features |= NETIF_F_NOCACHE_COPY;
5542 if (dev->features & NETIF_F_ALL_CSUM) {
5543 dev->wanted_features |= NETIF_F_NOCACHE_COPY;
5544 dev->features |= NETIF_F_NOCACHE_COPY;
5548 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5550 dev->vlan_features |= NETIF_F_HIGHDMA;
5552 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5553 ret = notifier_to_errno(ret);
5557 ret = netdev_register_kobject(dev);
5560 dev->reg_state = NETREG_REGISTERED;
5562 __netdev_update_features(dev);
5565 * Default initial state at registry is that the
5566 * device is present.
5569 set_bit(__LINK_STATE_PRESENT, &dev->state);
5571 dev_init_scheduler(dev);
5573 list_netdevice(dev);
5575 /* Notify protocols, that a new device appeared. */
5576 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5577 ret = notifier_to_errno(ret);
5579 rollback_registered(dev);
5580 dev->reg_state = NETREG_UNREGISTERED;
5583 * Prevent userspace races by waiting until the network
5584 * device is fully setup before sending notifications.
5586 if (!dev->rtnl_link_ops ||
5587 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5588 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5594 if (dev->netdev_ops->ndo_uninit)
5595 dev->netdev_ops->ndo_uninit(dev);
5598 EXPORT_SYMBOL(register_netdevice);
5601 * init_dummy_netdev - init a dummy network device for NAPI
5602 * @dev: device to init
5604 * This takes a network device structure and initialize the minimum
5605 * amount of fields so it can be used to schedule NAPI polls without
5606 * registering a full blown interface. This is to be used by drivers
5607 * that need to tie several hardware interfaces to a single NAPI
5608 * poll scheduler due to HW limitations.
5610 int init_dummy_netdev(struct net_device *dev)
5612 /* Clear everything. Note we don't initialize spinlocks
5613 * are they aren't supposed to be taken by any of the
5614 * NAPI code and this dummy netdev is supposed to be
5615 * only ever used for NAPI polls
5617 memset(dev, 0, sizeof(struct net_device));
5619 /* make sure we BUG if trying to hit standard
5620 * register/unregister code path
5622 dev->reg_state = NETREG_DUMMY;
5624 /* NAPI wants this */
5625 INIT_LIST_HEAD(&dev->napi_list);
5627 /* a dummy interface is started by default */
5628 set_bit(__LINK_STATE_PRESENT, &dev->state);
5629 set_bit(__LINK_STATE_START, &dev->state);
5631 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5632 * because users of this 'device' dont need to change
5638 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5642 * register_netdev - register a network device
5643 * @dev: device to register
5645 * Take a completed network device structure and add it to the kernel
5646 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5647 * chain. 0 is returned on success. A negative errno code is returned
5648 * on a failure to set up the device, or if the name is a duplicate.
5650 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5651 * and expands the device name if you passed a format string to
5654 int register_netdev(struct net_device *dev)
5659 err = register_netdevice(dev);
5663 EXPORT_SYMBOL(register_netdev);
5665 int netdev_refcnt_read(const struct net_device *dev)
5669 for_each_possible_cpu(i)
5670 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5673 EXPORT_SYMBOL(netdev_refcnt_read);
5676 * netdev_wait_allrefs - wait until all references are gone.
5678 * This is called when unregistering network devices.
5680 * Any protocol or device that holds a reference should register
5681 * for netdevice notification, and cleanup and put back the
5682 * reference if they receive an UNREGISTER event.
5683 * We can get stuck here if buggy protocols don't correctly
5686 static void netdev_wait_allrefs(struct net_device *dev)
5688 unsigned long rebroadcast_time, warning_time;
5691 linkwatch_forget_dev(dev);
5693 rebroadcast_time = warning_time = jiffies;
5694 refcnt = netdev_refcnt_read(dev);
5696 while (refcnt != 0) {
5697 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5700 /* Rebroadcast unregister notification */
5701 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5702 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5703 * should have already handle it the first time */
5705 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5707 /* We must not have linkwatch events
5708 * pending on unregister. If this
5709 * happens, we simply run the queue
5710 * unscheduled, resulting in a noop
5713 linkwatch_run_queue();
5718 rebroadcast_time = jiffies;
5723 refcnt = netdev_refcnt_read(dev);
5725 if (time_after(jiffies, warning_time + 10 * HZ)) {
5726 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
5728 warning_time = jiffies;
5737 * register_netdevice(x1);
5738 * register_netdevice(x2);
5740 * unregister_netdevice(y1);
5741 * unregister_netdevice(y2);
5747 * We are invoked by rtnl_unlock().
5748 * This allows us to deal with problems:
5749 * 1) We can delete sysfs objects which invoke hotplug
5750 * without deadlocking with linkwatch via keventd.
5751 * 2) Since we run with the RTNL semaphore not held, we can sleep
5752 * safely in order to wait for the netdev refcnt to drop to zero.
5754 * We must not return until all unregister events added during
5755 * the interval the lock was held have been completed.
5757 void netdev_run_todo(void)
5759 struct list_head list;
5761 /* Snapshot list, allow later requests */
5762 list_replace_init(&net_todo_list, &list);
5766 /* Wait for rcu callbacks to finish before attempting to drain
5767 * the device list. This usually avoids a 250ms wait.
5769 if (!list_empty(&list))
5772 while (!list_empty(&list)) {
5773 struct net_device *dev
5774 = list_first_entry(&list, struct net_device, todo_list);
5775 list_del(&dev->todo_list);
5777 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5778 pr_err("network todo '%s' but state %d\n",
5779 dev->name, dev->reg_state);
5784 dev->reg_state = NETREG_UNREGISTERED;
5786 on_each_cpu(flush_backlog, dev, 1);
5788 netdev_wait_allrefs(dev);
5791 BUG_ON(netdev_refcnt_read(dev));
5792 WARN_ON(rcu_access_pointer(dev->ip_ptr));
5793 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5794 WARN_ON(dev->dn_ptr);
5796 if (dev->destructor)
5797 dev->destructor(dev);
5799 /* Free network device */
5800 kobject_put(&dev->dev.kobj);
5804 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5805 * fields in the same order, with only the type differing.
5807 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5808 const struct net_device_stats *netdev_stats)
5810 #if BITS_PER_LONG == 64
5811 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5812 memcpy(stats64, netdev_stats, sizeof(*stats64));
5814 size_t i, n = sizeof(*stats64) / sizeof(u64);
5815 const unsigned long *src = (const unsigned long *)netdev_stats;
5816 u64 *dst = (u64 *)stats64;
5818 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5819 sizeof(*stats64) / sizeof(u64));
5820 for (i = 0; i < n; i++)
5824 EXPORT_SYMBOL(netdev_stats_to_stats64);
5827 * dev_get_stats - get network device statistics
5828 * @dev: device to get statistics from
5829 * @storage: place to store stats
5831 * Get network statistics from device. Return @storage.
5832 * The device driver may provide its own method by setting
5833 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5834 * otherwise the internal statistics structure is used.
5836 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5837 struct rtnl_link_stats64 *storage)
5839 const struct net_device_ops *ops = dev->netdev_ops;
5841 if (ops->ndo_get_stats64) {
5842 memset(storage, 0, sizeof(*storage));
5843 ops->ndo_get_stats64(dev, storage);
5844 } else if (ops->ndo_get_stats) {
5845 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5847 netdev_stats_to_stats64(storage, &dev->stats);
5849 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5852 EXPORT_SYMBOL(dev_get_stats);
5854 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5856 struct netdev_queue *queue = dev_ingress_queue(dev);
5858 #ifdef CONFIG_NET_CLS_ACT
5861 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5864 netdev_init_one_queue(dev, queue, NULL);
5865 queue->qdisc = &noop_qdisc;
5866 queue->qdisc_sleeping = &noop_qdisc;
5867 rcu_assign_pointer(dev->ingress_queue, queue);
5873 * alloc_netdev_mqs - allocate network device
5874 * @sizeof_priv: size of private data to allocate space for
5875 * @name: device name format string
5876 * @setup: callback to initialize device
5877 * @txqs: the number of TX subqueues to allocate
5878 * @rxqs: the number of RX subqueues to allocate
5880 * Allocates a struct net_device with private data area for driver use
5881 * and performs basic initialization. Also allocates subquue structs
5882 * for each queue on the device.
5884 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
5885 void (*setup)(struct net_device *),
5886 unsigned int txqs, unsigned int rxqs)
5888 struct net_device *dev;
5890 struct net_device *p;
5892 BUG_ON(strlen(name) >= sizeof(dev->name));
5895 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
5901 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
5906 alloc_size = sizeof(struct net_device);
5908 /* ensure 32-byte alignment of private area */
5909 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5910 alloc_size += sizeof_priv;
5912 /* ensure 32-byte alignment of whole construct */
5913 alloc_size += NETDEV_ALIGN - 1;
5915 p = kzalloc(alloc_size, GFP_KERNEL);
5917 pr_err("alloc_netdev: Unable to allocate device\n");
5921 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5922 dev->padded = (char *)dev - (char *)p;
5924 dev->pcpu_refcnt = alloc_percpu(int);
5925 if (!dev->pcpu_refcnt)
5928 if (dev_addr_init(dev))
5934 dev_net_set(dev, &init_net);
5936 dev->gso_max_size = GSO_MAX_SIZE;
5938 INIT_LIST_HEAD(&dev->napi_list);
5939 INIT_LIST_HEAD(&dev->unreg_list);
5940 INIT_LIST_HEAD(&dev->link_watch_list);
5941 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5944 dev->num_tx_queues = txqs;
5945 dev->real_num_tx_queues = txqs;
5946 if (netif_alloc_netdev_queues(dev))
5950 dev->num_rx_queues = rxqs;
5951 dev->real_num_rx_queues = rxqs;
5952 if (netif_alloc_rx_queues(dev))
5956 strcpy(dev->name, name);
5957 dev->group = INIT_NETDEV_GROUP;
5965 free_percpu(dev->pcpu_refcnt);
5975 EXPORT_SYMBOL(alloc_netdev_mqs);
5978 * free_netdev - free network device
5981 * This function does the last stage of destroying an allocated device
5982 * interface. The reference to the device object is released.
5983 * If this is the last reference then it will be freed.
5985 void free_netdev(struct net_device *dev)
5987 struct napi_struct *p, *n;
5989 release_net(dev_net(dev));
5996 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
5998 /* Flush device addresses */
5999 dev_addr_flush(dev);
6001 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6004 free_percpu(dev->pcpu_refcnt);
6005 dev->pcpu_refcnt = NULL;
6007 /* Compatibility with error handling in drivers */
6008 if (dev->reg_state == NETREG_UNINITIALIZED) {
6009 kfree((char *)dev - dev->padded);
6013 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6014 dev->reg_state = NETREG_RELEASED;
6016 /* will free via device release */
6017 put_device(&dev->dev);
6019 EXPORT_SYMBOL(free_netdev);
6022 * synchronize_net - Synchronize with packet receive processing
6024 * Wait for packets currently being received to be done.
6025 * Does not block later packets from starting.
6027 void synchronize_net(void)
6030 if (rtnl_is_locked())
6031 synchronize_rcu_expedited();
6035 EXPORT_SYMBOL(synchronize_net);
6038 * unregister_netdevice_queue - remove device from the kernel
6042 * This function shuts down a device interface and removes it
6043 * from the kernel tables.
6044 * If head not NULL, device is queued to be unregistered later.
6046 * Callers must hold the rtnl semaphore. You may want
6047 * unregister_netdev() instead of this.
6050 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6055 list_move_tail(&dev->unreg_list, head);
6057 rollback_registered(dev);
6058 /* Finish processing unregister after unlock */
6062 EXPORT_SYMBOL(unregister_netdevice_queue);
6065 * unregister_netdevice_many - unregister many devices
6066 * @head: list of devices
6068 void unregister_netdevice_many(struct list_head *head)
6070 struct net_device *dev;
6072 if (!list_empty(head)) {
6073 rollback_registered_many(head);
6074 list_for_each_entry(dev, head, unreg_list)
6078 EXPORT_SYMBOL(unregister_netdevice_many);
6081 * unregister_netdev - remove device from the kernel
6084 * This function shuts down a device interface and removes it
6085 * from the kernel tables.
6087 * This is just a wrapper for unregister_netdevice that takes
6088 * the rtnl semaphore. In general you want to use this and not
6089 * unregister_netdevice.
6091 void unregister_netdev(struct net_device *dev)
6094 unregister_netdevice(dev);
6097 EXPORT_SYMBOL(unregister_netdev);
6100 * dev_change_net_namespace - move device to different nethost namespace
6102 * @net: network namespace
6103 * @pat: If not NULL name pattern to try if the current device name
6104 * is already taken in the destination network namespace.
6106 * This function shuts down a device interface and moves it
6107 * to a new network namespace. On success 0 is returned, on
6108 * a failure a netagive errno code is returned.
6110 * Callers must hold the rtnl semaphore.
6113 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6119 /* Don't allow namespace local devices to be moved. */
6121 if (dev->features & NETIF_F_NETNS_LOCAL)
6124 /* Ensure the device has been registrered */
6126 if (dev->reg_state != NETREG_REGISTERED)
6129 /* Get out if there is nothing todo */
6131 if (net_eq(dev_net(dev), net))
6134 /* Pick the destination device name, and ensure
6135 * we can use it in the destination network namespace.
6138 if (__dev_get_by_name(net, dev->name)) {
6139 /* We get here if we can't use the current device name */
6142 if (dev_get_valid_name(dev, pat) < 0)
6147 * And now a mini version of register_netdevice unregister_netdevice.
6150 /* If device is running close it first. */
6153 /* And unlink it from device chain */
6155 unlist_netdevice(dev);
6159 /* Shutdown queueing discipline. */
6162 /* Notify protocols, that we are about to destroy
6163 this device. They should clean all the things.
6165 Note that dev->reg_state stays at NETREG_REGISTERED.
6166 This is wanted because this way 8021q and macvlan know
6167 the device is just moving and can keep their slaves up.
6169 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6170 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6171 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6174 * Flush the unicast and multicast chains
6179 /* Actually switch the network namespace */
6180 dev_net_set(dev, net);
6182 /* If there is an ifindex conflict assign a new one */
6183 if (__dev_get_by_index(net, dev->ifindex)) {
6184 int iflink = (dev->iflink == dev->ifindex);
6185 dev->ifindex = dev_new_index(net);
6187 dev->iflink = dev->ifindex;
6190 /* Fixup kobjects */
6191 err = device_rename(&dev->dev, dev->name);
6194 /* Add the device back in the hashes */
6195 list_netdevice(dev);
6197 /* Notify protocols, that a new device appeared. */
6198 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6201 * Prevent userspace races by waiting until the network
6202 * device is fully setup before sending notifications.
6204 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6211 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6213 static int dev_cpu_callback(struct notifier_block *nfb,
6214 unsigned long action,
6217 struct sk_buff **list_skb;
6218 struct sk_buff *skb;
6219 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6220 struct softnet_data *sd, *oldsd;
6222 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6225 local_irq_disable();
6226 cpu = smp_processor_id();
6227 sd = &per_cpu(softnet_data, cpu);
6228 oldsd = &per_cpu(softnet_data, oldcpu);
6230 /* Find end of our completion_queue. */
6231 list_skb = &sd->completion_queue;
6233 list_skb = &(*list_skb)->next;
6234 /* Append completion queue from offline CPU. */
6235 *list_skb = oldsd->completion_queue;
6236 oldsd->completion_queue = NULL;
6238 /* Append output queue from offline CPU. */
6239 if (oldsd->output_queue) {
6240 *sd->output_queue_tailp = oldsd->output_queue;
6241 sd->output_queue_tailp = oldsd->output_queue_tailp;
6242 oldsd->output_queue = NULL;
6243 oldsd->output_queue_tailp = &oldsd->output_queue;
6245 /* Append NAPI poll list from offline CPU. */
6246 if (!list_empty(&oldsd->poll_list)) {
6247 list_splice_init(&oldsd->poll_list, &sd->poll_list);
6248 raise_softirq_irqoff(NET_RX_SOFTIRQ);
6251 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6254 /* Process offline CPU's input_pkt_queue */
6255 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6257 input_queue_head_incr(oldsd);
6259 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6261 input_queue_head_incr(oldsd);
6269 * netdev_increment_features - increment feature set by one
6270 * @all: current feature set
6271 * @one: new feature set
6272 * @mask: mask feature set
6274 * Computes a new feature set after adding a device with feature set
6275 * @one to the master device with current feature set @all. Will not
6276 * enable anything that is off in @mask. Returns the new feature set.
6278 netdev_features_t netdev_increment_features(netdev_features_t all,
6279 netdev_features_t one, netdev_features_t mask)
6281 if (mask & NETIF_F_GEN_CSUM)
6282 mask |= NETIF_F_ALL_CSUM;
6283 mask |= NETIF_F_VLAN_CHALLENGED;
6285 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6286 all &= one | ~NETIF_F_ALL_FOR_ALL;
6288 /* If one device supports hw checksumming, set for all. */
6289 if (all & NETIF_F_GEN_CSUM)
6290 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6294 EXPORT_SYMBOL(netdev_increment_features);
6296 static struct hlist_head *netdev_create_hash(void)
6299 struct hlist_head *hash;
6301 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6303 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6304 INIT_HLIST_HEAD(&hash[i]);
6309 /* Initialize per network namespace state */
6310 static int __net_init netdev_init(struct net *net)
6312 INIT_LIST_HEAD(&net->dev_base_head);
6314 net->dev_name_head = netdev_create_hash();
6315 if (net->dev_name_head == NULL)
6318 net->dev_index_head = netdev_create_hash();
6319 if (net->dev_index_head == NULL)
6325 kfree(net->dev_name_head);
6331 * netdev_drivername - network driver for the device
6332 * @dev: network device
6334 * Determine network driver for device.
6336 const char *netdev_drivername(const struct net_device *dev)
6338 const struct device_driver *driver;
6339 const struct device *parent;
6340 const char *empty = "";
6342 parent = dev->dev.parent;
6346 driver = parent->driver;
6347 if (driver && driver->name)
6348 return driver->name;
6352 int __netdev_printk(const char *level, const struct net_device *dev,
6353 struct va_format *vaf)
6357 if (dev && dev->dev.parent)
6358 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6359 netdev_name(dev), vaf);
6361 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6363 r = printk("%s(NULL net_device): %pV", level, vaf);
6367 EXPORT_SYMBOL(__netdev_printk);
6369 int netdev_printk(const char *level, const struct net_device *dev,
6370 const char *format, ...)
6372 struct va_format vaf;
6376 va_start(args, format);
6381 r = __netdev_printk(level, dev, &vaf);
6386 EXPORT_SYMBOL(netdev_printk);
6388 #define define_netdev_printk_level(func, level) \
6389 int func(const struct net_device *dev, const char *fmt, ...) \
6392 struct va_format vaf; \
6395 va_start(args, fmt); \
6400 r = __netdev_printk(level, dev, &vaf); \
6405 EXPORT_SYMBOL(func);
6407 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6408 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6409 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6410 define_netdev_printk_level(netdev_err, KERN_ERR);
6411 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6412 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6413 define_netdev_printk_level(netdev_info, KERN_INFO);
6415 static void __net_exit netdev_exit(struct net *net)
6417 kfree(net->dev_name_head);
6418 kfree(net->dev_index_head);
6421 static struct pernet_operations __net_initdata netdev_net_ops = {
6422 .init = netdev_init,
6423 .exit = netdev_exit,
6426 static void __net_exit default_device_exit(struct net *net)
6428 struct net_device *dev, *aux;
6430 * Push all migratable network devices back to the
6431 * initial network namespace
6434 for_each_netdev_safe(net, dev, aux) {
6436 char fb_name[IFNAMSIZ];
6438 /* Ignore unmoveable devices (i.e. loopback) */
6439 if (dev->features & NETIF_F_NETNS_LOCAL)
6442 /* Leave virtual devices for the generic cleanup */
6443 if (dev->rtnl_link_ops)
6446 /* Push remaining network devices to init_net */
6447 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6448 err = dev_change_net_namespace(dev, &init_net, fb_name);
6450 pr_emerg("%s: failed to move %s to init_net: %d\n",
6451 __func__, dev->name, err);
6458 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6460 /* At exit all network devices most be removed from a network
6461 * namespace. Do this in the reverse order of registration.
6462 * Do this across as many network namespaces as possible to
6463 * improve batching efficiency.
6465 struct net_device *dev;
6467 LIST_HEAD(dev_kill_list);
6470 list_for_each_entry(net, net_list, exit_list) {
6471 for_each_netdev_reverse(net, dev) {
6472 if (dev->rtnl_link_ops)
6473 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6475 unregister_netdevice_queue(dev, &dev_kill_list);
6478 unregister_netdevice_many(&dev_kill_list);
6479 list_del(&dev_kill_list);
6483 static struct pernet_operations __net_initdata default_device_ops = {
6484 .exit = default_device_exit,
6485 .exit_batch = default_device_exit_batch,
6489 * Initialize the DEV module. At boot time this walks the device list and
6490 * unhooks any devices that fail to initialise (normally hardware not
6491 * present) and leaves us with a valid list of present and active devices.
6496 * This is called single threaded during boot, so no need
6497 * to take the rtnl semaphore.
6499 static int __init net_dev_init(void)
6501 int i, rc = -ENOMEM;
6503 BUG_ON(!dev_boot_phase);
6505 if (dev_proc_init())
6508 if (netdev_kobject_init())
6511 INIT_LIST_HEAD(&ptype_all);
6512 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6513 INIT_LIST_HEAD(&ptype_base[i]);
6515 if (register_pernet_subsys(&netdev_net_ops))
6519 * Initialise the packet receive queues.
6522 for_each_possible_cpu(i) {
6523 struct softnet_data *sd = &per_cpu(softnet_data, i);
6525 memset(sd, 0, sizeof(*sd));
6526 skb_queue_head_init(&sd->input_pkt_queue);
6527 skb_queue_head_init(&sd->process_queue);
6528 sd->completion_queue = NULL;
6529 INIT_LIST_HEAD(&sd->poll_list);
6530 sd->output_queue = NULL;
6531 sd->output_queue_tailp = &sd->output_queue;
6533 sd->csd.func = rps_trigger_softirq;
6539 sd->backlog.poll = process_backlog;
6540 sd->backlog.weight = weight_p;
6541 sd->backlog.gro_list = NULL;
6542 sd->backlog.gro_count = 0;
6547 /* The loopback device is special if any other network devices
6548 * is present in a network namespace the loopback device must
6549 * be present. Since we now dynamically allocate and free the
6550 * loopback device ensure this invariant is maintained by
6551 * keeping the loopback device as the first device on the
6552 * list of network devices. Ensuring the loopback devices
6553 * is the first device that appears and the last network device
6556 if (register_pernet_device(&loopback_net_ops))
6559 if (register_pernet_device(&default_device_ops))
6562 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6563 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6565 hotcpu_notifier(dev_cpu_callback, 0);
6573 subsys_initcall(net_dev_init);
6575 static int __init initialize_hashrnd(void)
6577 get_random_bytes(&hashrnd, sizeof(hashrnd));
6581 late_initcall_sync(initialize_hashrnd);