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 <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <net/xfrm.h>
108 #include <linux/highmem.h>
109 #include <linux/init.h>
110 #include <linux/kmod.h>
111 #include <linux/module.h>
112 #include <linux/netpoll.h>
113 #include <linux/rcupdate.h>
114 #include <linux/delay.h>
115 #include <net/wext.h>
116 #include <net/iw_handler.h>
117 #include <asm/current.h>
118 #include <linux/audit.h>
119 #include <linux/dmaengine.h>
120 #include <linux/err.h>
121 #include <linux/ctype.h>
122 #include <linux/if_arp.h>
123 #include <linux/if_vlan.h>
124 #include <linux/ip.h>
126 #include <linux/ipv6.h>
127 #include <linux/in.h>
128 #include <linux/jhash.h>
129 #include <linux/random.h>
130 #include <trace/events/napi.h>
131 #include <linux/pci.h>
133 #include "net-sysfs.h"
135 /* Instead of increasing this, you should create a hash table. */
136 #define MAX_GRO_SKBS 8
138 /* This should be increased if a protocol with a bigger head is added. */
139 #define GRO_MAX_HEAD (MAX_HEADER + 128)
142 * The list of packet types we will receive (as opposed to discard)
143 * and the routines to invoke.
145 * Why 16. Because with 16 the only overlap we get on a hash of the
146 * low nibble of the protocol value is RARP/SNAP/X.25.
148 * NOTE: That is no longer true with the addition of VLAN tags. Not
149 * sure which should go first, but I bet it won't make much
150 * difference if we are running VLANs. The good news is that
151 * this protocol won't be in the list unless compiled in, so
152 * the average user (w/out VLANs) will not be adversely affected.
169 #define PTYPE_HASH_SIZE (16)
170 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
172 static DEFINE_SPINLOCK(ptype_lock);
173 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
174 static struct list_head ptype_all __read_mostly; /* Taps */
177 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
180 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
182 * Writers must hold the rtnl semaphore while they loop through the
183 * dev_base_head list, and hold dev_base_lock for writing when they do the
184 * actual updates. This allows pure readers to access the list even
185 * while a writer is preparing to update it.
187 * To put it another way, dev_base_lock is held for writing only to
188 * protect against pure readers; the rtnl semaphore provides the
189 * protection against other writers.
191 * See, for example usages, register_netdevice() and
192 * unregister_netdevice(), which must be called with the rtnl
195 DEFINE_RWLOCK(dev_base_lock);
196 EXPORT_SYMBOL(dev_base_lock);
198 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
200 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
201 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
204 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
206 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
209 static inline void rps_lock(struct softnet_data *sd)
212 spin_lock(&sd->input_pkt_queue.lock);
216 static inline void rps_unlock(struct softnet_data *sd)
219 spin_unlock(&sd->input_pkt_queue.lock);
223 /* Device list insertion */
224 static int list_netdevice(struct net_device *dev)
226 struct net *net = dev_net(dev);
230 write_lock_bh(&dev_base_lock);
231 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
232 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
233 hlist_add_head_rcu(&dev->index_hlist,
234 dev_index_hash(net, dev->ifindex));
235 write_unlock_bh(&dev_base_lock);
239 /* Device list removal
240 * caller must respect a RCU grace period before freeing/reusing dev
242 static void unlist_netdevice(struct net_device *dev)
246 /* Unlink dev from the device chain */
247 write_lock_bh(&dev_base_lock);
248 list_del_rcu(&dev->dev_list);
249 hlist_del_rcu(&dev->name_hlist);
250 hlist_del_rcu(&dev->index_hlist);
251 write_unlock_bh(&dev_base_lock);
258 static RAW_NOTIFIER_HEAD(netdev_chain);
261 * Device drivers call our routines to queue packets here. We empty the
262 * queue in the local softnet handler.
265 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
266 EXPORT_PER_CPU_SYMBOL(softnet_data);
268 #ifdef CONFIG_LOCKDEP
270 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
271 * according to dev->type
273 static const unsigned short netdev_lock_type[] =
274 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
275 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
276 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
277 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
278 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
279 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
280 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
281 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
282 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
283 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
284 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
285 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
286 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
287 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
288 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
289 ARPHRD_VOID, ARPHRD_NONE};
291 static const char *const netdev_lock_name[] =
292 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
293 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
294 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
295 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
296 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
297 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
298 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
299 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
300 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
301 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
302 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
303 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
304 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
305 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
306 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
307 "_xmit_VOID", "_xmit_NONE"};
309 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
310 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
312 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
316 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
317 if (netdev_lock_type[i] == dev_type)
319 /* the last key is used by default */
320 return ARRAY_SIZE(netdev_lock_type) - 1;
323 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
324 unsigned short dev_type)
328 i = netdev_lock_pos(dev_type);
329 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
330 netdev_lock_name[i]);
333 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
337 i = netdev_lock_pos(dev->type);
338 lockdep_set_class_and_name(&dev->addr_list_lock,
339 &netdev_addr_lock_key[i],
340 netdev_lock_name[i]);
343 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
344 unsigned short dev_type)
347 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
352 /*******************************************************************************
354 Protocol management and registration routines
356 *******************************************************************************/
359 * Add a protocol ID to the list. Now that the input handler is
360 * smarter we can dispense with all the messy stuff that used to be
363 * BEWARE!!! Protocol handlers, mangling input packets,
364 * MUST BE last in hash buckets and checking protocol handlers
365 * MUST start from promiscuous ptype_all chain in net_bh.
366 * It is true now, do not change it.
367 * Explanation follows: if protocol handler, mangling packet, will
368 * be the first on list, it is not able to sense, that packet
369 * is cloned and should be copied-on-write, so that it will
370 * change it and subsequent readers will get broken packet.
375 * dev_add_pack - add packet handler
376 * @pt: packet type declaration
378 * Add a protocol handler to the networking stack. The passed &packet_type
379 * is linked into kernel lists and may not be freed until it has been
380 * removed from the kernel lists.
382 * This call does not sleep therefore it can not
383 * guarantee all CPU's that are in middle of receiving packets
384 * will see the new packet type (until the next received packet).
387 void dev_add_pack(struct packet_type *pt)
391 spin_lock_bh(&ptype_lock);
392 if (pt->type == htons(ETH_P_ALL))
393 list_add_rcu(&pt->list, &ptype_all);
395 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
396 list_add_rcu(&pt->list, &ptype_base[hash]);
398 spin_unlock_bh(&ptype_lock);
400 EXPORT_SYMBOL(dev_add_pack);
403 * __dev_remove_pack - remove packet handler
404 * @pt: packet type declaration
406 * Remove a protocol handler that was previously added to the kernel
407 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
408 * from the kernel lists and can be freed or reused once this function
411 * The packet type might still be in use by receivers
412 * and must not be freed until after all the CPU's have gone
413 * through a quiescent state.
415 void __dev_remove_pack(struct packet_type *pt)
417 struct list_head *head;
418 struct packet_type *pt1;
420 spin_lock_bh(&ptype_lock);
422 if (pt->type == htons(ETH_P_ALL))
425 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
427 list_for_each_entry(pt1, head, list) {
429 list_del_rcu(&pt->list);
434 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
436 spin_unlock_bh(&ptype_lock);
438 EXPORT_SYMBOL(__dev_remove_pack);
441 * dev_remove_pack - remove packet handler
442 * @pt: packet type declaration
444 * Remove a protocol handler that was previously added to the kernel
445 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
446 * from the kernel lists and can be freed or reused once this function
449 * This call sleeps to guarantee that no CPU is looking at the packet
452 void dev_remove_pack(struct packet_type *pt)
454 __dev_remove_pack(pt);
458 EXPORT_SYMBOL(dev_remove_pack);
460 /******************************************************************************
462 Device Boot-time Settings Routines
464 *******************************************************************************/
466 /* Boot time configuration table */
467 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
470 * netdev_boot_setup_add - add new setup entry
471 * @name: name of the device
472 * @map: configured settings for the device
474 * Adds new setup entry to the dev_boot_setup list. The function
475 * returns 0 on error and 1 on success. This is a generic routine to
478 static int netdev_boot_setup_add(char *name, struct ifmap *map)
480 struct netdev_boot_setup *s;
484 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
485 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
486 memset(s[i].name, 0, sizeof(s[i].name));
487 strlcpy(s[i].name, name, IFNAMSIZ);
488 memcpy(&s[i].map, map, sizeof(s[i].map));
493 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
497 * netdev_boot_setup_check - check boot time settings
498 * @dev: the netdevice
500 * Check boot time settings for the device.
501 * The found settings are set for the device to be used
502 * later in the device probing.
503 * Returns 0 if no settings found, 1 if they are.
505 int netdev_boot_setup_check(struct net_device *dev)
507 struct netdev_boot_setup *s = dev_boot_setup;
510 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
511 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
512 !strcmp(dev->name, s[i].name)) {
513 dev->irq = s[i].map.irq;
514 dev->base_addr = s[i].map.base_addr;
515 dev->mem_start = s[i].map.mem_start;
516 dev->mem_end = s[i].map.mem_end;
522 EXPORT_SYMBOL(netdev_boot_setup_check);
526 * netdev_boot_base - get address from boot time settings
527 * @prefix: prefix for network device
528 * @unit: id for network device
530 * Check boot time settings for the base address of device.
531 * The found settings are set for the device to be used
532 * later in the device probing.
533 * Returns 0 if no settings found.
535 unsigned long netdev_boot_base(const char *prefix, int unit)
537 const struct netdev_boot_setup *s = dev_boot_setup;
541 sprintf(name, "%s%d", prefix, unit);
544 * If device already registered then return base of 1
545 * to indicate not to probe for this interface
547 if (__dev_get_by_name(&init_net, name))
550 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
551 if (!strcmp(name, s[i].name))
552 return s[i].map.base_addr;
557 * Saves at boot time configured settings for any netdevice.
559 int __init netdev_boot_setup(char *str)
564 str = get_options(str, ARRAY_SIZE(ints), ints);
569 memset(&map, 0, sizeof(map));
573 map.base_addr = ints[2];
575 map.mem_start = ints[3];
577 map.mem_end = ints[4];
579 /* Add new entry to the list */
580 return netdev_boot_setup_add(str, &map);
583 __setup("netdev=", netdev_boot_setup);
585 /*******************************************************************************
587 Device Interface Subroutines
589 *******************************************************************************/
592 * __dev_get_by_name - find a device by its name
593 * @net: the applicable net namespace
594 * @name: name to find
596 * Find an interface by name. Must be called under RTNL semaphore
597 * or @dev_base_lock. If the name is found a pointer to the device
598 * is returned. If the name is not found then %NULL is returned. The
599 * reference counters are not incremented so the caller must be
600 * careful with locks.
603 struct net_device *__dev_get_by_name(struct net *net, const char *name)
605 struct hlist_node *p;
606 struct net_device *dev;
607 struct hlist_head *head = dev_name_hash(net, name);
609 hlist_for_each_entry(dev, p, head, name_hlist)
610 if (!strncmp(dev->name, name, IFNAMSIZ))
615 EXPORT_SYMBOL(__dev_get_by_name);
618 * dev_get_by_name_rcu - find a device by its name
619 * @net: the applicable net namespace
620 * @name: name to find
622 * Find an interface by name.
623 * If the name is found a pointer to the device is returned.
624 * If the name is not found then %NULL is returned.
625 * The reference counters are not incremented so the caller must be
626 * careful with locks. The caller must hold RCU lock.
629 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
631 struct hlist_node *p;
632 struct net_device *dev;
633 struct hlist_head *head = dev_name_hash(net, name);
635 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
636 if (!strncmp(dev->name, name, IFNAMSIZ))
641 EXPORT_SYMBOL(dev_get_by_name_rcu);
644 * dev_get_by_name - find a device by its name
645 * @net: the applicable net namespace
646 * @name: name to find
648 * Find an interface by name. This can be called from any
649 * context and does its own locking. The returned handle has
650 * the usage count incremented and the caller must use dev_put() to
651 * release it when it is no longer needed. %NULL is returned if no
652 * matching device is found.
655 struct net_device *dev_get_by_name(struct net *net, const char *name)
657 struct net_device *dev;
660 dev = dev_get_by_name_rcu(net, name);
666 EXPORT_SYMBOL(dev_get_by_name);
669 * __dev_get_by_index - find a device by its ifindex
670 * @net: the applicable net namespace
671 * @ifindex: index of device
673 * Search for an interface by index. Returns %NULL if the device
674 * is not found or a pointer to the device. The device has not
675 * had its reference counter increased so the caller must be careful
676 * about locking. The caller must hold either the RTNL semaphore
680 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
682 struct hlist_node *p;
683 struct net_device *dev;
684 struct hlist_head *head = dev_index_hash(net, ifindex);
686 hlist_for_each_entry(dev, p, head, index_hlist)
687 if (dev->ifindex == ifindex)
692 EXPORT_SYMBOL(__dev_get_by_index);
695 * dev_get_by_index_rcu - find a device by its ifindex
696 * @net: the applicable net namespace
697 * @ifindex: index of device
699 * Search for an interface by index. Returns %NULL if the device
700 * is not found or a pointer to the device. The device has not
701 * had its reference counter increased so the caller must be careful
702 * about locking. The caller must hold RCU lock.
705 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
707 struct hlist_node *p;
708 struct net_device *dev;
709 struct hlist_head *head = dev_index_hash(net, ifindex);
711 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
712 if (dev->ifindex == ifindex)
717 EXPORT_SYMBOL(dev_get_by_index_rcu);
721 * dev_get_by_index - find a device by its ifindex
722 * @net: the applicable net namespace
723 * @ifindex: index of device
725 * Search for an interface by index. Returns NULL if the device
726 * is not found or a pointer to the device. The device returned has
727 * had a reference added and the pointer is safe until the user calls
728 * dev_put to indicate they have finished with it.
731 struct net_device *dev_get_by_index(struct net *net, int ifindex)
733 struct net_device *dev;
736 dev = dev_get_by_index_rcu(net, ifindex);
742 EXPORT_SYMBOL(dev_get_by_index);
745 * dev_getbyhwaddr - find a device by its hardware address
746 * @net: the applicable net namespace
747 * @type: media type of device
748 * @ha: hardware address
750 * Search for an interface by MAC address. Returns NULL if the device
751 * is not found or a pointer to the device. The caller must hold the
752 * rtnl semaphore. The returned device has not had its ref count increased
753 * and the caller must therefore be careful about locking
756 * If the API was consistent this would be __dev_get_by_hwaddr
759 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
761 struct net_device *dev;
765 for_each_netdev(net, dev)
766 if (dev->type == type &&
767 !memcmp(dev->dev_addr, ha, dev->addr_len))
772 EXPORT_SYMBOL(dev_getbyhwaddr);
774 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
776 struct net_device *dev;
779 for_each_netdev(net, dev)
780 if (dev->type == type)
785 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
787 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
789 struct net_device *dev, *ret = NULL;
792 for_each_netdev_rcu(net, dev)
793 if (dev->type == type) {
801 EXPORT_SYMBOL(dev_getfirstbyhwtype);
804 * dev_get_by_flags_rcu - find any device with given flags
805 * @net: the applicable net namespace
806 * @if_flags: IFF_* values
807 * @mask: bitmask of bits in if_flags to check
809 * Search for any interface with the given flags. Returns NULL if a device
810 * is not found or a pointer to the device. Must be called inside
811 * rcu_read_lock(), and result refcount is unchanged.
814 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
817 struct net_device *dev, *ret;
820 for_each_netdev_rcu(net, dev) {
821 if (((dev->flags ^ if_flags) & mask) == 0) {
828 EXPORT_SYMBOL(dev_get_by_flags_rcu);
831 * dev_valid_name - check if name is okay for network device
834 * Network device names need to be valid file names to
835 * to allow sysfs to work. We also disallow any kind of
838 int dev_valid_name(const char *name)
842 if (strlen(name) >= IFNAMSIZ)
844 if (!strcmp(name, ".") || !strcmp(name, ".."))
848 if (*name == '/' || isspace(*name))
854 EXPORT_SYMBOL(dev_valid_name);
857 * __dev_alloc_name - allocate a name for a device
858 * @net: network namespace to allocate the device name in
859 * @name: name format string
860 * @buf: scratch buffer and result name string
862 * Passed a format string - eg "lt%d" it will try and find a suitable
863 * id. It scans list of devices to build up a free map, then chooses
864 * the first empty slot. The caller must hold the dev_base or rtnl lock
865 * while allocating the name and adding the device in order to avoid
867 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
868 * Returns the number of the unit assigned or a negative errno code.
871 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
875 const int max_netdevices = 8*PAGE_SIZE;
876 unsigned long *inuse;
877 struct net_device *d;
879 p = strnchr(name, IFNAMSIZ-1, '%');
882 * Verify the string as this thing may have come from
883 * the user. There must be either one "%d" and no other "%"
886 if (p[1] != 'd' || strchr(p + 2, '%'))
889 /* Use one page as a bit array of possible slots */
890 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
894 for_each_netdev(net, d) {
895 if (!sscanf(d->name, name, &i))
897 if (i < 0 || i >= max_netdevices)
900 /* avoid cases where sscanf is not exact inverse of printf */
901 snprintf(buf, IFNAMSIZ, name, i);
902 if (!strncmp(buf, d->name, IFNAMSIZ))
906 i = find_first_zero_bit(inuse, max_netdevices);
907 free_page((unsigned long) inuse);
911 snprintf(buf, IFNAMSIZ, name, i);
912 if (!__dev_get_by_name(net, buf))
915 /* It is possible to run out of possible slots
916 * when the name is long and there isn't enough space left
917 * for the digits, or if all bits are used.
923 * dev_alloc_name - allocate a name for a device
925 * @name: name format string
927 * Passed a format string - eg "lt%d" it will try and find a suitable
928 * id. It scans list of devices to build up a free map, then chooses
929 * the first empty slot. The caller must hold the dev_base or rtnl lock
930 * while allocating the name and adding the device in order to avoid
932 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
933 * Returns the number of the unit assigned or a negative errno code.
936 int dev_alloc_name(struct net_device *dev, const char *name)
942 BUG_ON(!dev_net(dev));
944 ret = __dev_alloc_name(net, name, buf);
946 strlcpy(dev->name, buf, IFNAMSIZ);
949 EXPORT_SYMBOL(dev_alloc_name);
951 static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt)
955 BUG_ON(!dev_net(dev));
958 if (!dev_valid_name(name))
961 if (fmt && strchr(name, '%'))
962 return dev_alloc_name(dev, name);
963 else if (__dev_get_by_name(net, name))
965 else if (dev->name != name)
966 strlcpy(dev->name, name, IFNAMSIZ);
972 * dev_change_name - change name of a device
974 * @newname: name (or format string) must be at least IFNAMSIZ
976 * Change name of a device, can pass format strings "eth%d".
979 int dev_change_name(struct net_device *dev, const char *newname)
981 char oldname[IFNAMSIZ];
987 BUG_ON(!dev_net(dev));
990 if (dev->flags & IFF_UP)
993 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
996 memcpy(oldname, dev->name, IFNAMSIZ);
998 err = dev_get_valid_name(dev, newname, 1);
1003 ret = device_rename(&dev->dev, dev->name);
1005 memcpy(dev->name, oldname, IFNAMSIZ);
1009 write_lock_bh(&dev_base_lock);
1010 hlist_del(&dev->name_hlist);
1011 write_unlock_bh(&dev_base_lock);
1015 write_lock_bh(&dev_base_lock);
1016 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1017 write_unlock_bh(&dev_base_lock);
1019 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1020 ret = notifier_to_errno(ret);
1023 /* err >= 0 after dev_alloc_name() or stores the first errno */
1026 memcpy(dev->name, oldname, IFNAMSIZ);
1030 "%s: name change rollback failed: %d.\n",
1039 * dev_set_alias - change ifalias of a device
1041 * @alias: name up to IFALIASZ
1042 * @len: limit of bytes to copy from info
1044 * Set ifalias for a device,
1046 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1050 if (len >= IFALIASZ)
1055 kfree(dev->ifalias);
1056 dev->ifalias = NULL;
1061 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1065 strlcpy(dev->ifalias, alias, len+1);
1071 * netdev_features_change - device changes features
1072 * @dev: device to cause notification
1074 * Called to indicate a device has changed features.
1076 void netdev_features_change(struct net_device *dev)
1078 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1080 EXPORT_SYMBOL(netdev_features_change);
1083 * netdev_state_change - device changes state
1084 * @dev: device to cause notification
1086 * Called to indicate a device has changed state. This function calls
1087 * the notifier chains for netdev_chain and sends a NEWLINK message
1088 * to the routing socket.
1090 void netdev_state_change(struct net_device *dev)
1092 if (dev->flags & IFF_UP) {
1093 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1094 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1097 EXPORT_SYMBOL(netdev_state_change);
1099 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1101 return call_netdevice_notifiers(event, dev);
1103 EXPORT_SYMBOL(netdev_bonding_change);
1106 * dev_load - load a network module
1107 * @net: the applicable net namespace
1108 * @name: name of interface
1110 * If a network interface is not present and the process has suitable
1111 * privileges this function loads the module. If module loading is not
1112 * available in this kernel then it becomes a nop.
1115 void dev_load(struct net *net, const char *name)
1117 struct net_device *dev;
1120 dev = dev_get_by_name_rcu(net, name);
1123 if (!dev && capable(CAP_NET_ADMIN))
1124 request_module("%s", name);
1126 EXPORT_SYMBOL(dev_load);
1128 static int __dev_open(struct net_device *dev)
1130 const struct net_device_ops *ops = dev->netdev_ops;
1136 * Is it even present?
1138 if (!netif_device_present(dev))
1141 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1142 ret = notifier_to_errno(ret);
1147 * Call device private open method
1149 set_bit(__LINK_STATE_START, &dev->state);
1151 if (ops->ndo_validate_addr)
1152 ret = ops->ndo_validate_addr(dev);
1154 if (!ret && ops->ndo_open)
1155 ret = ops->ndo_open(dev);
1158 * If it went open OK then:
1162 clear_bit(__LINK_STATE_START, &dev->state);
1167 dev->flags |= IFF_UP;
1172 net_dmaengine_get();
1175 * Initialize multicasting status
1177 dev_set_rx_mode(dev);
1180 * Wakeup transmit queue engine
1189 * dev_open - prepare an interface for use.
1190 * @dev: device to open
1192 * Takes a device from down to up state. The device's private open
1193 * function is invoked and then the multicast lists are loaded. Finally
1194 * the device is moved into the up state and a %NETDEV_UP message is
1195 * sent to the netdev notifier chain.
1197 * Calling this function on an active interface is a nop. On a failure
1198 * a negative errno code is returned.
1200 int dev_open(struct net_device *dev)
1207 if (dev->flags & IFF_UP)
1213 ret = __dev_open(dev);
1218 * ... and announce new interface.
1220 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1221 call_netdevice_notifiers(NETDEV_UP, dev);
1225 EXPORT_SYMBOL(dev_open);
1227 static int __dev_close(struct net_device *dev)
1229 const struct net_device_ops *ops = dev->netdev_ops;
1235 * Tell people we are going down, so that they can
1236 * prepare to death, when device is still operating.
1238 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1240 clear_bit(__LINK_STATE_START, &dev->state);
1242 /* Synchronize to scheduled poll. We cannot touch poll list,
1243 * it can be even on different cpu. So just clear netif_running().
1245 * dev->stop() will invoke napi_disable() on all of it's
1246 * napi_struct instances on this device.
1248 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1250 dev_deactivate(dev);
1253 * Call the device specific close. This cannot fail.
1254 * Only if device is UP
1256 * We allow it to be called even after a DETACH hot-plug
1263 * Device is now down.
1266 dev->flags &= ~IFF_UP;
1271 net_dmaengine_put();
1277 * dev_close - shutdown an interface.
1278 * @dev: device to shutdown
1280 * This function moves an active device into down state. A
1281 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1282 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1285 int dev_close(struct net_device *dev)
1287 if (!(dev->flags & IFF_UP))
1293 * Tell people we are down
1295 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1296 call_netdevice_notifiers(NETDEV_DOWN, dev);
1300 EXPORT_SYMBOL(dev_close);
1304 * dev_disable_lro - disable Large Receive Offload on a device
1307 * Disable Large Receive Offload (LRO) on a net device. Must be
1308 * called under RTNL. This is needed if received packets may be
1309 * forwarded to another interface.
1311 void dev_disable_lro(struct net_device *dev)
1313 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1314 dev->ethtool_ops->set_flags) {
1315 u32 flags = dev->ethtool_ops->get_flags(dev);
1316 if (flags & ETH_FLAG_LRO) {
1317 flags &= ~ETH_FLAG_LRO;
1318 dev->ethtool_ops->set_flags(dev, flags);
1321 WARN_ON(dev->features & NETIF_F_LRO);
1323 EXPORT_SYMBOL(dev_disable_lro);
1326 static int dev_boot_phase = 1;
1329 * Device change register/unregister. These are not inline or static
1330 * as we export them to the world.
1334 * register_netdevice_notifier - register a network notifier block
1337 * Register a notifier to be called when network device events occur.
1338 * The notifier passed is linked into the kernel structures and must
1339 * not be reused until it has been unregistered. A negative errno code
1340 * is returned on a failure.
1342 * When registered all registration and up events are replayed
1343 * to the new notifier to allow device to have a race free
1344 * view of the network device list.
1347 int register_netdevice_notifier(struct notifier_block *nb)
1349 struct net_device *dev;
1350 struct net_device *last;
1355 err = raw_notifier_chain_register(&netdev_chain, nb);
1361 for_each_netdev(net, dev) {
1362 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1363 err = notifier_to_errno(err);
1367 if (!(dev->flags & IFF_UP))
1370 nb->notifier_call(nb, NETDEV_UP, dev);
1381 for_each_netdev(net, dev) {
1385 if (dev->flags & IFF_UP) {
1386 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1387 nb->notifier_call(nb, NETDEV_DOWN, dev);
1389 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1390 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1394 raw_notifier_chain_unregister(&netdev_chain, nb);
1397 EXPORT_SYMBOL(register_netdevice_notifier);
1400 * unregister_netdevice_notifier - unregister a network notifier block
1403 * Unregister a notifier previously registered by
1404 * register_netdevice_notifier(). The notifier is unlinked into the
1405 * kernel structures and may then be reused. A negative errno code
1406 * is returned on a failure.
1409 int unregister_netdevice_notifier(struct notifier_block *nb)
1414 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1418 EXPORT_SYMBOL(unregister_netdevice_notifier);
1421 * call_netdevice_notifiers - call all network notifier blocks
1422 * @val: value passed unmodified to notifier function
1423 * @dev: net_device pointer passed unmodified to notifier function
1425 * Call all network notifier blocks. Parameters and return value
1426 * are as for raw_notifier_call_chain().
1429 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1432 return raw_notifier_call_chain(&netdev_chain, val, dev);
1435 /* When > 0 there are consumers of rx skb time stamps */
1436 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1438 void net_enable_timestamp(void)
1440 atomic_inc(&netstamp_needed);
1442 EXPORT_SYMBOL(net_enable_timestamp);
1444 void net_disable_timestamp(void)
1446 atomic_dec(&netstamp_needed);
1448 EXPORT_SYMBOL(net_disable_timestamp);
1450 static inline void net_timestamp_set(struct sk_buff *skb)
1452 if (atomic_read(&netstamp_needed))
1453 __net_timestamp(skb);
1455 skb->tstamp.tv64 = 0;
1458 static inline void net_timestamp_check(struct sk_buff *skb)
1460 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1461 __net_timestamp(skb);
1465 * dev_forward_skb - loopback an skb to another netif
1467 * @dev: destination network device
1468 * @skb: buffer to forward
1471 * NET_RX_SUCCESS (no congestion)
1472 * NET_RX_DROP (packet was dropped, but freed)
1474 * dev_forward_skb can be used for injecting an skb from the
1475 * start_xmit function of one device into the receive queue
1476 * of another device.
1478 * The receiving device may be in another namespace, so
1479 * we have to clear all information in the skb that could
1480 * impact namespace isolation.
1482 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1487 if (!(dev->flags & IFF_UP) ||
1488 (skb->len > (dev->mtu + dev->hard_header_len))) {
1492 skb_set_dev(skb, dev);
1493 skb->tstamp.tv64 = 0;
1494 skb->pkt_type = PACKET_HOST;
1495 skb->protocol = eth_type_trans(skb, dev);
1496 return netif_rx(skb);
1498 EXPORT_SYMBOL_GPL(dev_forward_skb);
1501 * Support routine. Sends outgoing frames to any network
1502 * taps currently in use.
1505 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1507 struct packet_type *ptype;
1509 #ifdef CONFIG_NET_CLS_ACT
1510 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1511 net_timestamp_set(skb);
1513 net_timestamp_set(skb);
1517 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1518 /* Never send packets back to the socket
1519 * they originated from - MvS (miquels@drinkel.ow.org)
1521 if ((ptype->dev == dev || !ptype->dev) &&
1522 (ptype->af_packet_priv == NULL ||
1523 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1524 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1528 /* skb->nh should be correctly
1529 set by sender, so that the second statement is
1530 just protection against buggy protocols.
1532 skb_reset_mac_header(skb2);
1534 if (skb_network_header(skb2) < skb2->data ||
1535 skb2->network_header > skb2->tail) {
1536 if (net_ratelimit())
1537 printk(KERN_CRIT "protocol %04x is "
1539 ntohs(skb2->protocol),
1541 skb_reset_network_header(skb2);
1544 skb2->transport_header = skb2->network_header;
1545 skb2->pkt_type = PACKET_OUTGOING;
1546 ptype->func(skb2, skb->dev, ptype, skb->dev);
1553 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1554 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1556 void netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1558 unsigned int real_num = dev->real_num_tx_queues;
1560 if (unlikely(txq > dev->num_tx_queues))
1562 else if (txq > real_num)
1563 dev->real_num_tx_queues = txq;
1564 else if (txq < real_num) {
1565 dev->real_num_tx_queues = txq;
1566 qdisc_reset_all_tx_gt(dev, txq);
1569 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1571 static inline void __netif_reschedule(struct Qdisc *q)
1573 struct softnet_data *sd;
1574 unsigned long flags;
1576 local_irq_save(flags);
1577 sd = &__get_cpu_var(softnet_data);
1578 q->next_sched = NULL;
1579 *sd->output_queue_tailp = q;
1580 sd->output_queue_tailp = &q->next_sched;
1581 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1582 local_irq_restore(flags);
1585 void __netif_schedule(struct Qdisc *q)
1587 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1588 __netif_reschedule(q);
1590 EXPORT_SYMBOL(__netif_schedule);
1592 void dev_kfree_skb_irq(struct sk_buff *skb)
1594 if (atomic_dec_and_test(&skb->users)) {
1595 struct softnet_data *sd;
1596 unsigned long flags;
1598 local_irq_save(flags);
1599 sd = &__get_cpu_var(softnet_data);
1600 skb->next = sd->completion_queue;
1601 sd->completion_queue = skb;
1602 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1603 local_irq_restore(flags);
1606 EXPORT_SYMBOL(dev_kfree_skb_irq);
1608 void dev_kfree_skb_any(struct sk_buff *skb)
1610 if (in_irq() || irqs_disabled())
1611 dev_kfree_skb_irq(skb);
1615 EXPORT_SYMBOL(dev_kfree_skb_any);
1619 * netif_device_detach - mark device as removed
1620 * @dev: network device
1622 * Mark device as removed from system and therefore no longer available.
1624 void netif_device_detach(struct net_device *dev)
1626 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1627 netif_running(dev)) {
1628 netif_tx_stop_all_queues(dev);
1631 EXPORT_SYMBOL(netif_device_detach);
1634 * netif_device_attach - mark device as attached
1635 * @dev: network device
1637 * Mark device as attached from system and restart if needed.
1639 void netif_device_attach(struct net_device *dev)
1641 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1642 netif_running(dev)) {
1643 netif_tx_wake_all_queues(dev);
1644 __netdev_watchdog_up(dev);
1647 EXPORT_SYMBOL(netif_device_attach);
1649 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1651 return ((features & NETIF_F_NO_CSUM) ||
1652 ((features & NETIF_F_V4_CSUM) &&
1653 protocol == htons(ETH_P_IP)) ||
1654 ((features & NETIF_F_V6_CSUM) &&
1655 protocol == htons(ETH_P_IPV6)) ||
1656 ((features & NETIF_F_FCOE_CRC) &&
1657 protocol == htons(ETH_P_FCOE)));
1660 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1662 if (can_checksum_protocol(dev->features, skb->protocol))
1665 if (skb->protocol == htons(ETH_P_8021Q)) {
1666 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1667 if (can_checksum_protocol(dev->features & dev->vlan_features,
1668 veh->h_vlan_encapsulated_proto))
1676 * skb_dev_set -- assign a new device to a buffer
1677 * @skb: buffer for the new device
1678 * @dev: network device
1680 * If an skb is owned by a device already, we have to reset
1681 * all data private to the namespace a device belongs to
1682 * before assigning it a new device.
1684 #ifdef CONFIG_NET_NS
1685 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1688 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1691 skb_init_secmark(skb);
1695 skb->ipvs_property = 0;
1696 #ifdef CONFIG_NET_SCHED
1702 EXPORT_SYMBOL(skb_set_dev);
1703 #endif /* CONFIG_NET_NS */
1706 * Invalidate hardware checksum when packet is to be mangled, and
1707 * complete checksum manually on outgoing path.
1709 int skb_checksum_help(struct sk_buff *skb)
1712 int ret = 0, offset;
1714 if (skb->ip_summed == CHECKSUM_COMPLETE)
1715 goto out_set_summed;
1717 if (unlikely(skb_shinfo(skb)->gso_size)) {
1718 /* Let GSO fix up the checksum. */
1719 goto out_set_summed;
1722 offset = skb->csum_start - skb_headroom(skb);
1723 BUG_ON(offset >= skb_headlen(skb));
1724 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1726 offset += skb->csum_offset;
1727 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1729 if (skb_cloned(skb) &&
1730 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1731 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1736 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1738 skb->ip_summed = CHECKSUM_NONE;
1742 EXPORT_SYMBOL(skb_checksum_help);
1745 * skb_gso_segment - Perform segmentation on skb.
1746 * @skb: buffer to segment
1747 * @features: features for the output path (see dev->features)
1749 * This function segments the given skb and returns a list of segments.
1751 * It may return NULL if the skb requires no segmentation. This is
1752 * only possible when GSO is used for verifying header integrity.
1754 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1756 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1757 struct packet_type *ptype;
1758 __be16 type = skb->protocol;
1761 skb_reset_mac_header(skb);
1762 skb->mac_len = skb->network_header - skb->mac_header;
1763 __skb_pull(skb, skb->mac_len);
1765 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1766 struct net_device *dev = skb->dev;
1767 struct ethtool_drvinfo info = {};
1769 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1770 dev->ethtool_ops->get_drvinfo(dev, &info);
1772 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1774 info.driver, dev ? dev->features : 0L,
1775 skb->sk ? skb->sk->sk_route_caps : 0L,
1776 skb->len, skb->data_len, skb->ip_summed);
1778 if (skb_header_cloned(skb) &&
1779 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1780 return ERR_PTR(err);
1784 list_for_each_entry_rcu(ptype,
1785 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1786 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1787 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1788 err = ptype->gso_send_check(skb);
1789 segs = ERR_PTR(err);
1790 if (err || skb_gso_ok(skb, features))
1792 __skb_push(skb, (skb->data -
1793 skb_network_header(skb)));
1795 segs = ptype->gso_segment(skb, features);
1801 __skb_push(skb, skb->data - skb_mac_header(skb));
1805 EXPORT_SYMBOL(skb_gso_segment);
1807 /* Take action when hardware reception checksum errors are detected. */
1809 void netdev_rx_csum_fault(struct net_device *dev)
1811 if (net_ratelimit()) {
1812 printk(KERN_ERR "%s: hw csum failure.\n",
1813 dev ? dev->name : "<unknown>");
1817 EXPORT_SYMBOL(netdev_rx_csum_fault);
1820 /* Actually, we should eliminate this check as soon as we know, that:
1821 * 1. IOMMU is present and allows to map all the memory.
1822 * 2. No high memory really exists on this machine.
1825 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1827 #ifdef CONFIG_HIGHMEM
1829 if (!(dev->features & NETIF_F_HIGHDMA)) {
1830 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1831 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1835 if (PCI_DMA_BUS_IS_PHYS) {
1836 struct device *pdev = dev->dev.parent;
1840 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1841 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1842 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1851 void (*destructor)(struct sk_buff *skb);
1854 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1856 static void dev_gso_skb_destructor(struct sk_buff *skb)
1858 struct dev_gso_cb *cb;
1861 struct sk_buff *nskb = skb->next;
1863 skb->next = nskb->next;
1866 } while (skb->next);
1868 cb = DEV_GSO_CB(skb);
1870 cb->destructor(skb);
1874 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1875 * @skb: buffer to segment
1877 * This function segments the given skb and stores the list of segments
1880 static int dev_gso_segment(struct sk_buff *skb)
1882 struct net_device *dev = skb->dev;
1883 struct sk_buff *segs;
1884 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1887 segs = skb_gso_segment(skb, features);
1889 /* Verifying header integrity only. */
1894 return PTR_ERR(segs);
1897 DEV_GSO_CB(skb)->destructor = skb->destructor;
1898 skb->destructor = dev_gso_skb_destructor;
1904 * Try to orphan skb early, right before transmission by the device.
1905 * We cannot orphan skb if tx timestamp is requested, since
1906 * drivers need to call skb_tstamp_tx() to send the timestamp.
1908 static inline void skb_orphan_try(struct sk_buff *skb)
1910 struct sock *sk = skb->sk;
1912 if (sk && !skb_tx(skb)->flags) {
1913 /* skb_tx_hash() wont be able to get sk.
1914 * We copy sk_hash into skb->rxhash
1917 skb->rxhash = sk->sk_hash;
1923 * Returns true if either:
1924 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
1925 * 2. skb is fragmented and the device does not support SG, or if
1926 * at least one of fragments is in highmem and device does not
1927 * support DMA from it.
1929 static inline int skb_needs_linearize(struct sk_buff *skb,
1930 struct net_device *dev)
1932 return skb_is_nonlinear(skb) &&
1933 ((skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
1934 (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
1935 illegal_highdma(dev, skb))));
1938 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1939 struct netdev_queue *txq)
1941 const struct net_device_ops *ops = dev->netdev_ops;
1942 int rc = NETDEV_TX_OK;
1944 if (likely(!skb->next)) {
1945 if (!list_empty(&ptype_all))
1946 dev_queue_xmit_nit(skb, dev);
1949 * If device doesnt need skb->dst, release it right now while
1950 * its hot in this cpu cache
1952 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1955 skb_orphan_try(skb);
1957 if (netif_needs_gso(dev, skb)) {
1958 if (unlikely(dev_gso_segment(skb)))
1963 if (skb_needs_linearize(skb, dev) &&
1964 __skb_linearize(skb))
1967 /* If packet is not checksummed and device does not
1968 * support checksumming for this protocol, complete
1969 * checksumming here.
1971 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1972 skb_set_transport_header(skb, skb->csum_start -
1974 if (!dev_can_checksum(dev, skb) &&
1975 skb_checksum_help(skb))
1980 rc = ops->ndo_start_xmit(skb, dev);
1981 if (rc == NETDEV_TX_OK)
1982 txq_trans_update(txq);
1988 struct sk_buff *nskb = skb->next;
1990 skb->next = nskb->next;
1994 * If device doesnt need nskb->dst, release it right now while
1995 * its hot in this cpu cache
1997 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2000 rc = ops->ndo_start_xmit(nskb, dev);
2001 if (unlikely(rc != NETDEV_TX_OK)) {
2002 if (rc & ~NETDEV_TX_MASK)
2003 goto out_kfree_gso_skb;
2004 nskb->next = skb->next;
2008 txq_trans_update(txq);
2009 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2010 return NETDEV_TX_BUSY;
2011 } while (skb->next);
2014 if (likely(skb->next == NULL))
2015 skb->destructor = DEV_GSO_CB(skb)->destructor;
2021 static u32 hashrnd __read_mostly;
2023 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
2027 if (skb_rx_queue_recorded(skb)) {
2028 hash = skb_get_rx_queue(skb);
2029 while (unlikely(hash >= dev->real_num_tx_queues))
2030 hash -= dev->real_num_tx_queues;
2034 if (skb->sk && skb->sk->sk_hash)
2035 hash = skb->sk->sk_hash;
2037 hash = (__force u16) skb->protocol ^ skb->rxhash;
2038 hash = jhash_1word(hash, hashrnd);
2040 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
2042 EXPORT_SYMBOL(skb_tx_hash);
2044 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2046 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2047 if (net_ratelimit()) {
2048 pr_warning("%s selects TX queue %d, but "
2049 "real number of TX queues is %d\n",
2050 dev->name, queue_index, dev->real_num_tx_queues);
2057 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2058 struct sk_buff *skb)
2061 const struct net_device_ops *ops = dev->netdev_ops;
2063 if (ops->ndo_select_queue) {
2064 queue_index = ops->ndo_select_queue(dev, skb);
2065 queue_index = dev_cap_txqueue(dev, queue_index);
2067 struct sock *sk = skb->sk;
2068 queue_index = sk_tx_queue_get(sk);
2069 if (queue_index < 0) {
2072 if (dev->real_num_tx_queues > 1)
2073 queue_index = skb_tx_hash(dev, skb);
2076 struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
2078 if (dst && skb_dst(skb) == dst)
2079 sk_tx_queue_set(sk, queue_index);
2084 skb_set_queue_mapping(skb, queue_index);
2085 return netdev_get_tx_queue(dev, queue_index);
2088 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2089 struct net_device *dev,
2090 struct netdev_queue *txq)
2092 spinlock_t *root_lock = qdisc_lock(q);
2093 bool contended = qdisc_is_running(q);
2097 * Heuristic to force contended enqueues to serialize on a
2098 * separate lock before trying to get qdisc main lock.
2099 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2100 * and dequeue packets faster.
2102 if (unlikely(contended))
2103 spin_lock(&q->busylock);
2105 spin_lock(root_lock);
2106 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2109 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2110 qdisc_run_begin(q)) {
2112 * This is a work-conserving queue; there are no old skbs
2113 * waiting to be sent out; and the qdisc is not running -
2114 * xmit the skb directly.
2116 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2118 __qdisc_update_bstats(q, skb->len);
2119 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2120 if (unlikely(contended)) {
2121 spin_unlock(&q->busylock);
2128 rc = NET_XMIT_SUCCESS;
2131 rc = qdisc_enqueue_root(skb, q);
2132 if (qdisc_run_begin(q)) {
2133 if (unlikely(contended)) {
2134 spin_unlock(&q->busylock);
2140 spin_unlock(root_lock);
2141 if (unlikely(contended))
2142 spin_unlock(&q->busylock);
2147 * dev_queue_xmit - transmit a buffer
2148 * @skb: buffer to transmit
2150 * Queue a buffer for transmission to a network device. The caller must
2151 * have set the device and priority and built the buffer before calling
2152 * this function. The function can be called from an interrupt.
2154 * A negative errno code is returned on a failure. A success does not
2155 * guarantee the frame will be transmitted as it may be dropped due
2156 * to congestion or traffic shaping.
2158 * -----------------------------------------------------------------------------------
2159 * I notice this method can also return errors from the queue disciplines,
2160 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2163 * Regardless of the return value, the skb is consumed, so it is currently
2164 * difficult to retry a send to this method. (You can bump the ref count
2165 * before sending to hold a reference for retry if you are careful.)
2167 * When calling this method, interrupts MUST be enabled. This is because
2168 * the BH enable code must have IRQs enabled so that it will not deadlock.
2171 int dev_queue_xmit(struct sk_buff *skb)
2173 struct net_device *dev = skb->dev;
2174 struct netdev_queue *txq;
2178 /* Disable soft irqs for various locks below. Also
2179 * stops preemption for RCU.
2183 txq = dev_pick_tx(dev, skb);
2184 q = rcu_dereference_bh(txq->qdisc);
2186 #ifdef CONFIG_NET_CLS_ACT
2187 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2190 rc = __dev_xmit_skb(skb, q, dev, txq);
2194 /* The device has no queue. Common case for software devices:
2195 loopback, all the sorts of tunnels...
2197 Really, it is unlikely that netif_tx_lock protection is necessary
2198 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2200 However, it is possible, that they rely on protection
2203 Check this and shot the lock. It is not prone from deadlocks.
2204 Either shot noqueue qdisc, it is even simpler 8)
2206 if (dev->flags & IFF_UP) {
2207 int cpu = smp_processor_id(); /* ok because BHs are off */
2209 if (txq->xmit_lock_owner != cpu) {
2211 HARD_TX_LOCK(dev, txq, cpu);
2213 if (!netif_tx_queue_stopped(txq)) {
2214 rc = dev_hard_start_xmit(skb, dev, txq);
2215 if (dev_xmit_complete(rc)) {
2216 HARD_TX_UNLOCK(dev, txq);
2220 HARD_TX_UNLOCK(dev, txq);
2221 if (net_ratelimit())
2222 printk(KERN_CRIT "Virtual device %s asks to "
2223 "queue packet!\n", dev->name);
2225 /* Recursion is detected! It is possible,
2227 if (net_ratelimit())
2228 printk(KERN_CRIT "Dead loop on virtual device "
2229 "%s, fix it urgently!\n", dev->name);
2234 rcu_read_unlock_bh();
2239 rcu_read_unlock_bh();
2242 EXPORT_SYMBOL(dev_queue_xmit);
2245 /*=======================================================================
2247 =======================================================================*/
2249 int netdev_max_backlog __read_mostly = 1000;
2250 int netdev_tstamp_prequeue __read_mostly = 1;
2251 int netdev_budget __read_mostly = 300;
2252 int weight_p __read_mostly = 64; /* old backlog weight */
2254 /* Called with irq disabled */
2255 static inline void ____napi_schedule(struct softnet_data *sd,
2256 struct napi_struct *napi)
2258 list_add_tail(&napi->poll_list, &sd->poll_list);
2259 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2264 /* One global table that all flow-based protocols share. */
2265 struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
2266 EXPORT_SYMBOL(rps_sock_flow_table);
2269 * get_rps_cpu is called from netif_receive_skb and returns the target
2270 * CPU from the RPS map of the receiving queue for a given skb.
2271 * rcu_read_lock must be held on entry.
2273 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2274 struct rps_dev_flow **rflowp)
2276 struct ipv6hdr *ip6;
2278 struct netdev_rx_queue *rxqueue;
2279 struct rps_map *map;
2280 struct rps_dev_flow_table *flow_table;
2281 struct rps_sock_flow_table *sock_flow_table;
2285 u32 addr1, addr2, ihl;
2291 if (skb_rx_queue_recorded(skb)) {
2292 u16 index = skb_get_rx_queue(skb);
2293 if (unlikely(index >= dev->num_rx_queues)) {
2294 WARN_ONCE(dev->num_rx_queues > 1, "%s received packet "
2295 "on queue %u, but number of RX queues is %u\n",
2296 dev->name, index, dev->num_rx_queues);
2299 rxqueue = dev->_rx + index;
2303 if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
2307 goto got_hash; /* Skip hash computation on packet header */
2309 switch (skb->protocol) {
2310 case __constant_htons(ETH_P_IP):
2311 if (!pskb_may_pull(skb, sizeof(*ip)))
2314 ip = (struct iphdr *) skb->data;
2315 ip_proto = ip->protocol;
2316 addr1 = (__force u32) ip->saddr;
2317 addr2 = (__force u32) ip->daddr;
2320 case __constant_htons(ETH_P_IPV6):
2321 if (!pskb_may_pull(skb, sizeof(*ip6)))
2324 ip6 = (struct ipv6hdr *) skb->data;
2325 ip_proto = ip6->nexthdr;
2326 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2327 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2340 case IPPROTO_UDPLITE:
2341 if (pskb_may_pull(skb, (ihl * 4) + 4)) {
2342 ports.v32 = * (__force u32 *) (skb->data + (ihl * 4));
2343 if (ports.v16[1] < ports.v16[0])
2344 swap(ports.v16[0], ports.v16[1]);
2352 /* get a consistent hash (same value on both flow directions) */
2355 skb->rxhash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2360 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2361 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2362 if (flow_table && sock_flow_table) {
2364 struct rps_dev_flow *rflow;
2366 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2369 next_cpu = sock_flow_table->ents[skb->rxhash &
2370 sock_flow_table->mask];
2373 * If the desired CPU (where last recvmsg was done) is
2374 * different from current CPU (one in the rx-queue flow
2375 * table entry), switch if one of the following holds:
2376 * - Current CPU is unset (equal to RPS_NO_CPU).
2377 * - Current CPU is offline.
2378 * - The current CPU's queue tail has advanced beyond the
2379 * last packet that was enqueued using this table entry.
2380 * This guarantees that all previous packets for the flow
2381 * have been dequeued, thus preserving in order delivery.
2383 if (unlikely(tcpu != next_cpu) &&
2384 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2385 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2386 rflow->last_qtail)) >= 0)) {
2387 tcpu = rflow->cpu = next_cpu;
2388 if (tcpu != RPS_NO_CPU)
2389 rflow->last_qtail = per_cpu(softnet_data,
2390 tcpu).input_queue_head;
2392 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2399 map = rcu_dereference(rxqueue->rps_map);
2401 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2403 if (cpu_online(tcpu)) {
2413 /* Called from hardirq (IPI) context */
2414 static void rps_trigger_softirq(void *data)
2416 struct softnet_data *sd = data;
2418 ____napi_schedule(sd, &sd->backlog);
2422 #endif /* CONFIG_RPS */
2425 * Check if this softnet_data structure is another cpu one
2426 * If yes, queue it to our IPI list and return 1
2429 static int rps_ipi_queued(struct softnet_data *sd)
2432 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2435 sd->rps_ipi_next = mysd->rps_ipi_list;
2436 mysd->rps_ipi_list = sd;
2438 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2441 #endif /* CONFIG_RPS */
2446 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2447 * queue (may be a remote CPU queue).
2449 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2450 unsigned int *qtail)
2452 struct softnet_data *sd;
2453 unsigned long flags;
2455 sd = &per_cpu(softnet_data, cpu);
2457 local_irq_save(flags);
2460 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2461 if (skb_queue_len(&sd->input_pkt_queue)) {
2463 __skb_queue_tail(&sd->input_pkt_queue, skb);
2464 input_queue_tail_incr_save(sd, qtail);
2466 local_irq_restore(flags);
2467 return NET_RX_SUCCESS;
2470 /* Schedule NAPI for backlog device
2471 * We can use non atomic operation since we own the queue lock
2473 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2474 if (!rps_ipi_queued(sd))
2475 ____napi_schedule(sd, &sd->backlog);
2483 local_irq_restore(flags);
2490 * netif_rx - post buffer to the network code
2491 * @skb: buffer to post
2493 * This function receives a packet from a device driver and queues it for
2494 * the upper (protocol) levels to process. It always succeeds. The buffer
2495 * may be dropped during processing for congestion control or by the
2499 * NET_RX_SUCCESS (no congestion)
2500 * NET_RX_DROP (packet was dropped)
2504 int netif_rx(struct sk_buff *skb)
2508 /* if netpoll wants it, pretend we never saw it */
2509 if (netpoll_rx(skb))
2512 if (netdev_tstamp_prequeue)
2513 net_timestamp_check(skb);
2517 struct rps_dev_flow voidflow, *rflow = &voidflow;
2523 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2525 cpu = smp_processor_id();
2527 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2535 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2541 EXPORT_SYMBOL(netif_rx);
2543 int netif_rx_ni(struct sk_buff *skb)
2548 err = netif_rx(skb);
2549 if (local_softirq_pending())
2555 EXPORT_SYMBOL(netif_rx_ni);
2557 static void net_tx_action(struct softirq_action *h)
2559 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2561 if (sd->completion_queue) {
2562 struct sk_buff *clist;
2564 local_irq_disable();
2565 clist = sd->completion_queue;
2566 sd->completion_queue = NULL;
2570 struct sk_buff *skb = clist;
2571 clist = clist->next;
2573 WARN_ON(atomic_read(&skb->users));
2578 if (sd->output_queue) {
2581 local_irq_disable();
2582 head = sd->output_queue;
2583 sd->output_queue = NULL;
2584 sd->output_queue_tailp = &sd->output_queue;
2588 struct Qdisc *q = head;
2589 spinlock_t *root_lock;
2591 head = head->next_sched;
2593 root_lock = qdisc_lock(q);
2594 if (spin_trylock(root_lock)) {
2595 smp_mb__before_clear_bit();
2596 clear_bit(__QDISC_STATE_SCHED,
2599 spin_unlock(root_lock);
2601 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2603 __netif_reschedule(q);
2605 smp_mb__before_clear_bit();
2606 clear_bit(__QDISC_STATE_SCHED,
2614 static inline int deliver_skb(struct sk_buff *skb,
2615 struct packet_type *pt_prev,
2616 struct net_device *orig_dev)
2618 atomic_inc(&skb->users);
2619 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2622 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
2623 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
2624 /* This hook is defined here for ATM LANE */
2625 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2626 unsigned char *addr) __read_mostly;
2627 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2630 #ifdef CONFIG_NET_CLS_ACT
2631 /* TODO: Maybe we should just force sch_ingress to be compiled in
2632 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2633 * a compare and 2 stores extra right now if we dont have it on
2634 * but have CONFIG_NET_CLS_ACT
2635 * NOTE: This doesnt stop any functionality; if you dont have
2636 * the ingress scheduler, you just cant add policies on ingress.
2639 static int ing_filter(struct sk_buff *skb)
2641 struct net_device *dev = skb->dev;
2642 u32 ttl = G_TC_RTTL(skb->tc_verd);
2643 struct netdev_queue *rxq;
2644 int result = TC_ACT_OK;
2647 if (unlikely(MAX_RED_LOOP < ttl++)) {
2648 if (net_ratelimit())
2649 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
2650 skb->skb_iif, dev->ifindex);
2654 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2655 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2657 rxq = &dev->rx_queue;
2660 if (q != &noop_qdisc) {
2661 spin_lock(qdisc_lock(q));
2662 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2663 result = qdisc_enqueue_root(skb, q);
2664 spin_unlock(qdisc_lock(q));
2670 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2671 struct packet_type **pt_prev,
2672 int *ret, struct net_device *orig_dev)
2674 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2678 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2682 switch (ing_filter(skb)) {
2696 * netif_nit_deliver - deliver received packets to network taps
2699 * This function is used to deliver incoming packets to network
2700 * taps. It should be used when the normal netif_receive_skb path
2701 * is bypassed, for example because of VLAN acceleration.
2703 void netif_nit_deliver(struct sk_buff *skb)
2705 struct packet_type *ptype;
2707 if (list_empty(&ptype_all))
2710 skb_reset_network_header(skb);
2711 skb_reset_transport_header(skb);
2712 skb->mac_len = skb->network_header - skb->mac_header;
2715 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2716 if (!ptype->dev || ptype->dev == skb->dev)
2717 deliver_skb(skb, ptype, skb->dev);
2723 * netdev_rx_handler_register - register receive handler
2724 * @dev: device to register a handler for
2725 * @rx_handler: receive handler to register
2726 * @rx_handler_data: data pointer that is used by rx handler
2728 * Register a receive hander for a device. This handler will then be
2729 * called from __netif_receive_skb. A negative errno code is returned
2732 * The caller must hold the rtnl_mutex.
2734 int netdev_rx_handler_register(struct net_device *dev,
2735 rx_handler_func_t *rx_handler,
2736 void *rx_handler_data)
2740 if (dev->rx_handler)
2743 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
2744 rcu_assign_pointer(dev->rx_handler, rx_handler);
2748 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
2751 * netdev_rx_handler_unregister - unregister receive handler
2752 * @dev: device to unregister a handler from
2754 * Unregister a receive hander from a device.
2756 * The caller must hold the rtnl_mutex.
2758 void netdev_rx_handler_unregister(struct net_device *dev)
2762 rcu_assign_pointer(dev->rx_handler, NULL);
2763 rcu_assign_pointer(dev->rx_handler_data, NULL);
2765 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
2767 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2768 struct net_device *master)
2770 if (skb->pkt_type == PACKET_HOST) {
2771 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2773 memcpy(dest, master->dev_addr, ETH_ALEN);
2777 /* On bonding slaves other than the currently active slave, suppress
2778 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2779 * ARP on active-backup slaves with arp_validate enabled.
2781 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2783 struct net_device *dev = skb->dev;
2785 if (master->priv_flags & IFF_MASTER_ARPMON)
2786 dev->last_rx = jiffies;
2788 if ((master->priv_flags & IFF_MASTER_ALB) &&
2789 (master->priv_flags & IFF_BRIDGE_PORT)) {
2790 /* Do address unmangle. The local destination address
2791 * will be always the one master has. Provides the right
2792 * functionality in a bridge.
2794 skb_bond_set_mac_by_master(skb, master);
2797 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2798 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2799 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2802 if (master->priv_flags & IFF_MASTER_ALB) {
2803 if (skb->pkt_type != PACKET_BROADCAST &&
2804 skb->pkt_type != PACKET_MULTICAST)
2807 if (master->priv_flags & IFF_MASTER_8023AD &&
2808 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2815 EXPORT_SYMBOL(__skb_bond_should_drop);
2817 static int __netif_receive_skb(struct sk_buff *skb)
2819 struct packet_type *ptype, *pt_prev;
2820 rx_handler_func_t *rx_handler;
2821 struct net_device *orig_dev;
2822 struct net_device *master;
2823 struct net_device *null_or_orig;
2824 struct net_device *orig_or_bond;
2825 int ret = NET_RX_DROP;
2828 if (!netdev_tstamp_prequeue)
2829 net_timestamp_check(skb);
2831 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2832 return NET_RX_SUCCESS;
2834 /* if we've gotten here through NAPI, check netpoll */
2835 if (netpoll_receive_skb(skb))
2839 skb->skb_iif = skb->dev->ifindex;
2842 * bonding note: skbs received on inactive slaves should only
2843 * be delivered to pkt handlers that are exact matches. Also
2844 * the deliver_no_wcard flag will be set. If packet handlers
2845 * are sensitive to duplicate packets these skbs will need to
2846 * be dropped at the handler. The vlan accel path may have
2847 * already set the deliver_no_wcard flag.
2849 null_or_orig = NULL;
2850 orig_dev = skb->dev;
2851 master = ACCESS_ONCE(orig_dev->master);
2852 if (skb->deliver_no_wcard)
2853 null_or_orig = orig_dev;
2855 if (skb_bond_should_drop(skb, master)) {
2856 skb->deliver_no_wcard = 1;
2857 null_or_orig = orig_dev; /* deliver only exact match */
2862 __this_cpu_inc(softnet_data.processed);
2863 skb_reset_network_header(skb);
2864 skb_reset_transport_header(skb);
2865 skb->mac_len = skb->network_header - skb->mac_header;
2871 #ifdef CONFIG_NET_CLS_ACT
2872 if (skb->tc_verd & TC_NCLS) {
2873 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2878 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2879 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2880 ptype->dev == orig_dev) {
2882 ret = deliver_skb(skb, pt_prev, orig_dev);
2887 #ifdef CONFIG_NET_CLS_ACT
2888 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2894 /* If we got this far with a hardware accelerated VLAN tag, it means
2895 * that we were put in promiscuous mode but nobody is interested in
2896 * this vid. Drop the packet now to prevent it from getting propagated
2897 * to other parts of the stack that won't know how to deal with packets
2898 * tagged in this manner.
2900 if (unlikely(vlan_tx_tag_present(skb)))
2903 /* Handle special case of bridge or macvlan */
2904 rx_handler = rcu_dereference(skb->dev->rx_handler);
2907 ret = deliver_skb(skb, pt_prev, orig_dev);
2910 skb = rx_handler(skb);
2916 * Make sure frames received on VLAN interfaces stacked on
2917 * bonding interfaces still make their way to any base bonding
2918 * device that may have registered for a specific ptype. The
2919 * handler may have to adjust skb->dev and orig_dev.
2921 orig_or_bond = orig_dev;
2922 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2923 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2924 orig_or_bond = vlan_dev_real_dev(skb->dev);
2927 type = skb->protocol;
2928 list_for_each_entry_rcu(ptype,
2929 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2930 if (ptype->type == type && (ptype->dev == null_or_orig ||
2931 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2932 ptype->dev == orig_or_bond)) {
2934 ret = deliver_skb(skb, pt_prev, orig_dev);
2941 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2944 /* Jamal, now you will not able to escape explaining
2945 * me how you were going to use this. :-)
2956 * netif_receive_skb - process receive buffer from network
2957 * @skb: buffer to process
2959 * netif_receive_skb() is the main receive data processing function.
2960 * It always succeeds. The buffer may be dropped during processing
2961 * for congestion control or by the protocol layers.
2963 * This function may only be called from softirq context and interrupts
2964 * should be enabled.
2966 * Return values (usually ignored):
2967 * NET_RX_SUCCESS: no congestion
2968 * NET_RX_DROP: packet was dropped
2970 int netif_receive_skb(struct sk_buff *skb)
2972 if (netdev_tstamp_prequeue)
2973 net_timestamp_check(skb);
2975 if (skb_defer_rx_timestamp(skb))
2976 return NET_RX_SUCCESS;
2980 struct rps_dev_flow voidflow, *rflow = &voidflow;
2985 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2988 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2992 ret = __netif_receive_skb(skb);
2998 return __netif_receive_skb(skb);
3001 EXPORT_SYMBOL(netif_receive_skb);
3003 /* Network device is going away, flush any packets still pending
3004 * Called with irqs disabled.
3006 static void flush_backlog(void *arg)
3008 struct net_device *dev = arg;
3009 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3010 struct sk_buff *skb, *tmp;
3013 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3014 if (skb->dev == dev) {
3015 __skb_unlink(skb, &sd->input_pkt_queue);
3017 input_queue_head_incr(sd);
3022 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3023 if (skb->dev == dev) {
3024 __skb_unlink(skb, &sd->process_queue);
3026 input_queue_head_incr(sd);
3031 static int napi_gro_complete(struct sk_buff *skb)
3033 struct packet_type *ptype;
3034 __be16 type = skb->protocol;
3035 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3038 if (NAPI_GRO_CB(skb)->count == 1) {
3039 skb_shinfo(skb)->gso_size = 0;
3044 list_for_each_entry_rcu(ptype, head, list) {
3045 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3048 err = ptype->gro_complete(skb);
3054 WARN_ON(&ptype->list == head);
3056 return NET_RX_SUCCESS;
3060 return netif_receive_skb(skb);
3063 static void napi_gro_flush(struct napi_struct *napi)
3065 struct sk_buff *skb, *next;
3067 for (skb = napi->gro_list; skb; skb = next) {
3070 napi_gro_complete(skb);
3073 napi->gro_count = 0;
3074 napi->gro_list = NULL;
3077 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3079 struct sk_buff **pp = NULL;
3080 struct packet_type *ptype;
3081 __be16 type = skb->protocol;
3082 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3085 enum gro_result ret;
3087 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3090 if (skb_is_gso(skb) || skb_has_frags(skb))
3094 list_for_each_entry_rcu(ptype, head, list) {
3095 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3098 skb_set_network_header(skb, skb_gro_offset(skb));
3099 mac_len = skb->network_header - skb->mac_header;
3100 skb->mac_len = mac_len;
3101 NAPI_GRO_CB(skb)->same_flow = 0;
3102 NAPI_GRO_CB(skb)->flush = 0;
3103 NAPI_GRO_CB(skb)->free = 0;
3105 pp = ptype->gro_receive(&napi->gro_list, skb);
3110 if (&ptype->list == head)
3113 same_flow = NAPI_GRO_CB(skb)->same_flow;
3114 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3117 struct sk_buff *nskb = *pp;
3121 napi_gro_complete(nskb);
3128 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3132 NAPI_GRO_CB(skb)->count = 1;
3133 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3134 skb->next = napi->gro_list;
3135 napi->gro_list = skb;
3139 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3140 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3142 BUG_ON(skb->end - skb->tail < grow);
3144 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3147 skb->data_len -= grow;
3149 skb_shinfo(skb)->frags[0].page_offset += grow;
3150 skb_shinfo(skb)->frags[0].size -= grow;
3152 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3153 put_page(skb_shinfo(skb)->frags[0].page);
3154 memmove(skb_shinfo(skb)->frags,
3155 skb_shinfo(skb)->frags + 1,
3156 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3167 EXPORT_SYMBOL(dev_gro_receive);
3170 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3174 for (p = napi->gro_list; p; p = p->next) {
3175 NAPI_GRO_CB(p)->same_flow =
3176 (p->dev == skb->dev) &&
3177 !compare_ether_header(skb_mac_header(p),
3178 skb_gro_mac_header(skb));
3179 NAPI_GRO_CB(p)->flush = 0;
3182 return dev_gro_receive(napi, skb);
3185 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3189 if (netif_receive_skb(skb))
3194 case GRO_MERGED_FREE:
3205 EXPORT_SYMBOL(napi_skb_finish);
3207 void skb_gro_reset_offset(struct sk_buff *skb)
3209 NAPI_GRO_CB(skb)->data_offset = 0;
3210 NAPI_GRO_CB(skb)->frag0 = NULL;
3211 NAPI_GRO_CB(skb)->frag0_len = 0;
3213 if (skb->mac_header == skb->tail &&
3214 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3215 NAPI_GRO_CB(skb)->frag0 =
3216 page_address(skb_shinfo(skb)->frags[0].page) +
3217 skb_shinfo(skb)->frags[0].page_offset;
3218 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3221 EXPORT_SYMBOL(skb_gro_reset_offset);
3223 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3225 skb_gro_reset_offset(skb);
3227 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3229 EXPORT_SYMBOL(napi_gro_receive);
3231 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3233 __skb_pull(skb, skb_headlen(skb));
3234 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3238 EXPORT_SYMBOL(napi_reuse_skb);
3240 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3242 struct sk_buff *skb = napi->skb;
3245 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3251 EXPORT_SYMBOL(napi_get_frags);
3253 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3259 skb->protocol = eth_type_trans(skb, skb->dev);
3261 if (ret == GRO_HELD)
3262 skb_gro_pull(skb, -ETH_HLEN);
3263 else if (netif_receive_skb(skb))
3268 case GRO_MERGED_FREE:
3269 napi_reuse_skb(napi, skb);
3278 EXPORT_SYMBOL(napi_frags_finish);
3280 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3282 struct sk_buff *skb = napi->skb;
3289 skb_reset_mac_header(skb);
3290 skb_gro_reset_offset(skb);
3292 off = skb_gro_offset(skb);
3293 hlen = off + sizeof(*eth);
3294 eth = skb_gro_header_fast(skb, off);
3295 if (skb_gro_header_hard(skb, hlen)) {
3296 eth = skb_gro_header_slow(skb, hlen, off);
3297 if (unlikely(!eth)) {
3298 napi_reuse_skb(napi, skb);
3304 skb_gro_pull(skb, sizeof(*eth));
3307 * This works because the only protocols we care about don't require
3308 * special handling. We'll fix it up properly at the end.
3310 skb->protocol = eth->h_proto;
3315 EXPORT_SYMBOL(napi_frags_skb);
3317 gro_result_t napi_gro_frags(struct napi_struct *napi)
3319 struct sk_buff *skb = napi_frags_skb(napi);
3324 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3326 EXPORT_SYMBOL(napi_gro_frags);
3329 * net_rps_action sends any pending IPI's for rps.
3330 * Note: called with local irq disabled, but exits with local irq enabled.
3332 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3335 struct softnet_data *remsd = sd->rps_ipi_list;
3338 sd->rps_ipi_list = NULL;
3342 /* Send pending IPI's to kick RPS processing on remote cpus. */
3344 struct softnet_data *next = remsd->rps_ipi_next;
3346 if (cpu_online(remsd->cpu))
3347 __smp_call_function_single(remsd->cpu,
3356 static int process_backlog(struct napi_struct *napi, int quota)
3359 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3362 /* Check if we have pending ipi, its better to send them now,
3363 * not waiting net_rx_action() end.
3365 if (sd->rps_ipi_list) {
3366 local_irq_disable();
3367 net_rps_action_and_irq_enable(sd);
3370 napi->weight = weight_p;
3371 local_irq_disable();
3372 while (work < quota) {
3373 struct sk_buff *skb;
3376 while ((skb = __skb_dequeue(&sd->process_queue))) {
3378 __netif_receive_skb(skb);
3379 local_irq_disable();
3380 input_queue_head_incr(sd);
3381 if (++work >= quota) {
3388 qlen = skb_queue_len(&sd->input_pkt_queue);
3390 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3391 &sd->process_queue);
3393 if (qlen < quota - work) {
3395 * Inline a custom version of __napi_complete().
3396 * only current cpu owns and manipulates this napi,
3397 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3398 * we can use a plain write instead of clear_bit(),
3399 * and we dont need an smp_mb() memory barrier.
3401 list_del(&napi->poll_list);
3404 quota = work + qlen;
3414 * __napi_schedule - schedule for receive
3415 * @n: entry to schedule
3417 * The entry's receive function will be scheduled to run
3419 void __napi_schedule(struct napi_struct *n)
3421 unsigned long flags;
3423 local_irq_save(flags);
3424 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3425 local_irq_restore(flags);
3427 EXPORT_SYMBOL(__napi_schedule);
3429 void __napi_complete(struct napi_struct *n)
3431 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3432 BUG_ON(n->gro_list);
3434 list_del(&n->poll_list);
3435 smp_mb__before_clear_bit();
3436 clear_bit(NAPI_STATE_SCHED, &n->state);
3438 EXPORT_SYMBOL(__napi_complete);
3440 void napi_complete(struct napi_struct *n)
3442 unsigned long flags;
3445 * don't let napi dequeue from the cpu poll list
3446 * just in case its running on a different cpu
3448 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3452 local_irq_save(flags);
3454 local_irq_restore(flags);
3456 EXPORT_SYMBOL(napi_complete);
3458 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3459 int (*poll)(struct napi_struct *, int), int weight)
3461 INIT_LIST_HEAD(&napi->poll_list);
3462 napi->gro_count = 0;
3463 napi->gro_list = NULL;
3466 napi->weight = weight;
3467 list_add(&napi->dev_list, &dev->napi_list);
3469 #ifdef CONFIG_NETPOLL
3470 spin_lock_init(&napi->poll_lock);
3471 napi->poll_owner = -1;
3473 set_bit(NAPI_STATE_SCHED, &napi->state);
3475 EXPORT_SYMBOL(netif_napi_add);
3477 void netif_napi_del(struct napi_struct *napi)
3479 struct sk_buff *skb, *next;
3481 list_del_init(&napi->dev_list);
3482 napi_free_frags(napi);
3484 for (skb = napi->gro_list; skb; skb = next) {
3490 napi->gro_list = NULL;
3491 napi->gro_count = 0;
3493 EXPORT_SYMBOL(netif_napi_del);
3495 static void net_rx_action(struct softirq_action *h)
3497 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3498 unsigned long time_limit = jiffies + 2;
3499 int budget = netdev_budget;
3502 local_irq_disable();
3504 while (!list_empty(&sd->poll_list)) {
3505 struct napi_struct *n;
3508 /* If softirq window is exhuasted then punt.
3509 * Allow this to run for 2 jiffies since which will allow
3510 * an average latency of 1.5/HZ.
3512 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3517 /* Even though interrupts have been re-enabled, this
3518 * access is safe because interrupts can only add new
3519 * entries to the tail of this list, and only ->poll()
3520 * calls can remove this head entry from the list.
3522 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3524 have = netpoll_poll_lock(n);
3528 /* This NAPI_STATE_SCHED test is for avoiding a race
3529 * with netpoll's poll_napi(). Only the entity which
3530 * obtains the lock and sees NAPI_STATE_SCHED set will
3531 * actually make the ->poll() call. Therefore we avoid
3532 * accidently calling ->poll() when NAPI is not scheduled.
3535 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3536 work = n->poll(n, weight);
3540 WARN_ON_ONCE(work > weight);
3544 local_irq_disable();
3546 /* Drivers must not modify the NAPI state if they
3547 * consume the entire weight. In such cases this code
3548 * still "owns" the NAPI instance and therefore can
3549 * move the instance around on the list at-will.
3551 if (unlikely(work == weight)) {
3552 if (unlikely(napi_disable_pending(n))) {
3555 local_irq_disable();
3557 list_move_tail(&n->poll_list, &sd->poll_list);
3560 netpoll_poll_unlock(have);
3563 net_rps_action_and_irq_enable(sd);
3565 #ifdef CONFIG_NET_DMA
3567 * There may not be any more sk_buffs coming right now, so push
3568 * any pending DMA copies to hardware
3570 dma_issue_pending_all();
3577 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3581 static gifconf_func_t *gifconf_list[NPROTO];
3584 * register_gifconf - register a SIOCGIF handler
3585 * @family: Address family
3586 * @gifconf: Function handler
3588 * Register protocol dependent address dumping routines. The handler
3589 * that is passed must not be freed or reused until it has been replaced
3590 * by another handler.
3592 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3594 if (family >= NPROTO)
3596 gifconf_list[family] = gifconf;
3599 EXPORT_SYMBOL(register_gifconf);
3603 * Map an interface index to its name (SIOCGIFNAME)
3607 * We need this ioctl for efficient implementation of the
3608 * if_indextoname() function required by the IPv6 API. Without
3609 * it, we would have to search all the interfaces to find a
3613 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3615 struct net_device *dev;
3619 * Fetch the caller's info block.
3622 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3626 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3632 strcpy(ifr.ifr_name, dev->name);
3635 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3641 * Perform a SIOCGIFCONF call. This structure will change
3642 * size eventually, and there is nothing I can do about it.
3643 * Thus we will need a 'compatibility mode'.
3646 static int dev_ifconf(struct net *net, char __user *arg)
3649 struct net_device *dev;
3656 * Fetch the caller's info block.
3659 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3666 * Loop over the interfaces, and write an info block for each.
3670 for_each_netdev(net, dev) {
3671 for (i = 0; i < NPROTO; i++) {
3672 if (gifconf_list[i]) {
3675 done = gifconf_list[i](dev, NULL, 0);
3677 done = gifconf_list[i](dev, pos + total,
3687 * All done. Write the updated control block back to the caller.
3689 ifc.ifc_len = total;
3692 * Both BSD and Solaris return 0 here, so we do too.
3694 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3697 #ifdef CONFIG_PROC_FS
3699 * This is invoked by the /proc filesystem handler to display a device
3702 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3705 struct net *net = seq_file_net(seq);
3707 struct net_device *dev;
3711 return SEQ_START_TOKEN;
3714 for_each_netdev_rcu(net, dev)
3721 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3723 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3724 first_net_device(seq_file_net(seq)) :
3725 next_net_device((struct net_device *)v);
3728 return rcu_dereference(dev);
3731 void dev_seq_stop(struct seq_file *seq, void *v)
3737 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3739 struct rtnl_link_stats64 temp;
3740 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
3742 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
3743 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
3744 dev->name, stats->rx_bytes, stats->rx_packets,
3746 stats->rx_dropped + stats->rx_missed_errors,
3747 stats->rx_fifo_errors,
3748 stats->rx_length_errors + stats->rx_over_errors +
3749 stats->rx_crc_errors + stats->rx_frame_errors,
3750 stats->rx_compressed, stats->multicast,
3751 stats->tx_bytes, stats->tx_packets,
3752 stats->tx_errors, stats->tx_dropped,
3753 stats->tx_fifo_errors, stats->collisions,
3754 stats->tx_carrier_errors +
3755 stats->tx_aborted_errors +
3756 stats->tx_window_errors +
3757 stats->tx_heartbeat_errors,
3758 stats->tx_compressed);
3762 * Called from the PROCfs module. This now uses the new arbitrary sized
3763 * /proc/net interface to create /proc/net/dev
3765 static int dev_seq_show(struct seq_file *seq, void *v)
3767 if (v == SEQ_START_TOKEN)
3768 seq_puts(seq, "Inter-| Receive "
3770 " face |bytes packets errs drop fifo frame "
3771 "compressed multicast|bytes packets errs "
3772 "drop fifo colls carrier compressed\n");
3774 dev_seq_printf_stats(seq, v);
3778 static struct softnet_data *softnet_get_online(loff_t *pos)
3780 struct softnet_data *sd = NULL;
3782 while (*pos < nr_cpu_ids)
3783 if (cpu_online(*pos)) {
3784 sd = &per_cpu(softnet_data, *pos);
3791 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3793 return softnet_get_online(pos);
3796 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3799 return softnet_get_online(pos);
3802 static void softnet_seq_stop(struct seq_file *seq, void *v)
3806 static int softnet_seq_show(struct seq_file *seq, void *v)
3808 struct softnet_data *sd = v;
3810 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3811 sd->processed, sd->dropped, sd->time_squeeze, 0,
3812 0, 0, 0, 0, /* was fastroute */
3813 sd->cpu_collision, sd->received_rps);
3817 static const struct seq_operations dev_seq_ops = {
3818 .start = dev_seq_start,
3819 .next = dev_seq_next,
3820 .stop = dev_seq_stop,
3821 .show = dev_seq_show,
3824 static int dev_seq_open(struct inode *inode, struct file *file)
3826 return seq_open_net(inode, file, &dev_seq_ops,
3827 sizeof(struct seq_net_private));
3830 static const struct file_operations dev_seq_fops = {
3831 .owner = THIS_MODULE,
3832 .open = dev_seq_open,
3834 .llseek = seq_lseek,
3835 .release = seq_release_net,
3838 static const struct seq_operations softnet_seq_ops = {
3839 .start = softnet_seq_start,
3840 .next = softnet_seq_next,
3841 .stop = softnet_seq_stop,
3842 .show = softnet_seq_show,
3845 static int softnet_seq_open(struct inode *inode, struct file *file)
3847 return seq_open(file, &softnet_seq_ops);
3850 static const struct file_operations softnet_seq_fops = {
3851 .owner = THIS_MODULE,
3852 .open = softnet_seq_open,
3854 .llseek = seq_lseek,
3855 .release = seq_release,
3858 static void *ptype_get_idx(loff_t pos)
3860 struct packet_type *pt = NULL;
3864 list_for_each_entry_rcu(pt, &ptype_all, list) {
3870 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3871 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3880 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3884 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3887 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3889 struct packet_type *pt;
3890 struct list_head *nxt;
3894 if (v == SEQ_START_TOKEN)
3895 return ptype_get_idx(0);
3898 nxt = pt->list.next;
3899 if (pt->type == htons(ETH_P_ALL)) {
3900 if (nxt != &ptype_all)
3903 nxt = ptype_base[0].next;
3905 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3907 while (nxt == &ptype_base[hash]) {
3908 if (++hash >= PTYPE_HASH_SIZE)
3910 nxt = ptype_base[hash].next;
3913 return list_entry(nxt, struct packet_type, list);
3916 static void ptype_seq_stop(struct seq_file *seq, void *v)
3922 static int ptype_seq_show(struct seq_file *seq, void *v)
3924 struct packet_type *pt = v;
3926 if (v == SEQ_START_TOKEN)
3927 seq_puts(seq, "Type Device Function\n");
3928 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3929 if (pt->type == htons(ETH_P_ALL))
3930 seq_puts(seq, "ALL ");
3932 seq_printf(seq, "%04x", ntohs(pt->type));
3934 seq_printf(seq, " %-8s %pF\n",
3935 pt->dev ? pt->dev->name : "", pt->func);
3941 static const struct seq_operations ptype_seq_ops = {
3942 .start = ptype_seq_start,
3943 .next = ptype_seq_next,
3944 .stop = ptype_seq_stop,
3945 .show = ptype_seq_show,
3948 static int ptype_seq_open(struct inode *inode, struct file *file)
3950 return seq_open_net(inode, file, &ptype_seq_ops,
3951 sizeof(struct seq_net_private));
3954 static const struct file_operations ptype_seq_fops = {
3955 .owner = THIS_MODULE,
3956 .open = ptype_seq_open,
3958 .llseek = seq_lseek,
3959 .release = seq_release_net,
3963 static int __net_init dev_proc_net_init(struct net *net)
3967 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3969 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3971 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3974 if (wext_proc_init(net))
3980 proc_net_remove(net, "ptype");
3982 proc_net_remove(net, "softnet_stat");
3984 proc_net_remove(net, "dev");
3988 static void __net_exit dev_proc_net_exit(struct net *net)
3990 wext_proc_exit(net);
3992 proc_net_remove(net, "ptype");
3993 proc_net_remove(net, "softnet_stat");
3994 proc_net_remove(net, "dev");
3997 static struct pernet_operations __net_initdata dev_proc_ops = {
3998 .init = dev_proc_net_init,
3999 .exit = dev_proc_net_exit,
4002 static int __init dev_proc_init(void)
4004 return register_pernet_subsys(&dev_proc_ops);
4007 #define dev_proc_init() 0
4008 #endif /* CONFIG_PROC_FS */
4012 * netdev_set_master - set up master/slave pair
4013 * @slave: slave device
4014 * @master: new master device
4016 * Changes the master device of the slave. Pass %NULL to break the
4017 * bonding. The caller must hold the RTNL semaphore. On a failure
4018 * a negative errno code is returned. On success the reference counts
4019 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
4020 * function returns zero.
4022 int netdev_set_master(struct net_device *slave, struct net_device *master)
4024 struct net_device *old = slave->master;
4034 slave->master = master;
4041 slave->flags |= IFF_SLAVE;
4043 slave->flags &= ~IFF_SLAVE;
4045 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4048 EXPORT_SYMBOL(netdev_set_master);
4050 static void dev_change_rx_flags(struct net_device *dev, int flags)
4052 const struct net_device_ops *ops = dev->netdev_ops;
4054 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4055 ops->ndo_change_rx_flags(dev, flags);
4058 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4060 unsigned short old_flags = dev->flags;
4066 dev->flags |= IFF_PROMISC;
4067 dev->promiscuity += inc;
4068 if (dev->promiscuity == 0) {
4071 * If inc causes overflow, untouch promisc and return error.
4074 dev->flags &= ~IFF_PROMISC;
4076 dev->promiscuity -= inc;
4077 printk(KERN_WARNING "%s: promiscuity touches roof, "
4078 "set promiscuity failed, promiscuity feature "
4079 "of device might be broken.\n", dev->name);
4083 if (dev->flags != old_flags) {
4084 printk(KERN_INFO "device %s %s promiscuous mode\n",
4085 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4087 if (audit_enabled) {
4088 current_uid_gid(&uid, &gid);
4089 audit_log(current->audit_context, GFP_ATOMIC,
4090 AUDIT_ANOM_PROMISCUOUS,
4091 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4092 dev->name, (dev->flags & IFF_PROMISC),
4093 (old_flags & IFF_PROMISC),
4094 audit_get_loginuid(current),
4096 audit_get_sessionid(current));
4099 dev_change_rx_flags(dev, IFF_PROMISC);
4105 * dev_set_promiscuity - update promiscuity count on a device
4109 * Add or remove promiscuity from a device. While the count in the device
4110 * remains above zero the interface remains promiscuous. Once it hits zero
4111 * the device reverts back to normal filtering operation. A negative inc
4112 * value is used to drop promiscuity on the device.
4113 * Return 0 if successful or a negative errno code on error.
4115 int dev_set_promiscuity(struct net_device *dev, int inc)
4117 unsigned short old_flags = dev->flags;
4120 err = __dev_set_promiscuity(dev, inc);
4123 if (dev->flags != old_flags)
4124 dev_set_rx_mode(dev);
4127 EXPORT_SYMBOL(dev_set_promiscuity);
4130 * dev_set_allmulti - update allmulti count on a device
4134 * Add or remove reception of all multicast frames to a device. While the
4135 * count in the device remains above zero the interface remains listening
4136 * to all interfaces. Once it hits zero the device reverts back to normal
4137 * filtering operation. A negative @inc value is used to drop the counter
4138 * when releasing a resource needing all multicasts.
4139 * Return 0 if successful or a negative errno code on error.
4142 int dev_set_allmulti(struct net_device *dev, int inc)
4144 unsigned short old_flags = dev->flags;
4148 dev->flags |= IFF_ALLMULTI;
4149 dev->allmulti += inc;
4150 if (dev->allmulti == 0) {
4153 * If inc causes overflow, untouch allmulti and return error.
4156 dev->flags &= ~IFF_ALLMULTI;
4158 dev->allmulti -= inc;
4159 printk(KERN_WARNING "%s: allmulti touches roof, "
4160 "set allmulti failed, allmulti feature of "
4161 "device might be broken.\n", dev->name);
4165 if (dev->flags ^ old_flags) {
4166 dev_change_rx_flags(dev, IFF_ALLMULTI);
4167 dev_set_rx_mode(dev);
4171 EXPORT_SYMBOL(dev_set_allmulti);
4174 * Upload unicast and multicast address lists to device and
4175 * configure RX filtering. When the device doesn't support unicast
4176 * filtering it is put in promiscuous mode while unicast addresses
4179 void __dev_set_rx_mode(struct net_device *dev)
4181 const struct net_device_ops *ops = dev->netdev_ops;
4183 /* dev_open will call this function so the list will stay sane. */
4184 if (!(dev->flags&IFF_UP))
4187 if (!netif_device_present(dev))
4190 if (ops->ndo_set_rx_mode)
4191 ops->ndo_set_rx_mode(dev);
4193 /* Unicast addresses changes may only happen under the rtnl,
4194 * therefore calling __dev_set_promiscuity here is safe.
4196 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4197 __dev_set_promiscuity(dev, 1);
4198 dev->uc_promisc = 1;
4199 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4200 __dev_set_promiscuity(dev, -1);
4201 dev->uc_promisc = 0;
4204 if (ops->ndo_set_multicast_list)
4205 ops->ndo_set_multicast_list(dev);
4209 void dev_set_rx_mode(struct net_device *dev)
4211 netif_addr_lock_bh(dev);
4212 __dev_set_rx_mode(dev);
4213 netif_addr_unlock_bh(dev);
4217 * dev_get_flags - get flags reported to userspace
4220 * Get the combination of flag bits exported through APIs to userspace.
4222 unsigned dev_get_flags(const struct net_device *dev)
4226 flags = (dev->flags & ~(IFF_PROMISC |
4231 (dev->gflags & (IFF_PROMISC |
4234 if (netif_running(dev)) {
4235 if (netif_oper_up(dev))
4236 flags |= IFF_RUNNING;
4237 if (netif_carrier_ok(dev))
4238 flags |= IFF_LOWER_UP;
4239 if (netif_dormant(dev))
4240 flags |= IFF_DORMANT;
4245 EXPORT_SYMBOL(dev_get_flags);
4247 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4249 int old_flags = dev->flags;
4255 * Set the flags on our device.
4258 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4259 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4261 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4265 * Load in the correct multicast list now the flags have changed.
4268 if ((old_flags ^ flags) & IFF_MULTICAST)
4269 dev_change_rx_flags(dev, IFF_MULTICAST);
4271 dev_set_rx_mode(dev);
4274 * Have we downed the interface. We handle IFF_UP ourselves
4275 * according to user attempts to set it, rather than blindly
4280 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4281 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4284 dev_set_rx_mode(dev);
4287 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4288 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4290 dev->gflags ^= IFF_PROMISC;
4291 dev_set_promiscuity(dev, inc);
4294 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4295 is important. Some (broken) drivers set IFF_PROMISC, when
4296 IFF_ALLMULTI is requested not asking us and not reporting.
4298 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4299 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4301 dev->gflags ^= IFF_ALLMULTI;
4302 dev_set_allmulti(dev, inc);
4308 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4310 unsigned int changes = dev->flags ^ old_flags;
4312 if (changes & IFF_UP) {
4313 if (dev->flags & IFF_UP)
4314 call_netdevice_notifiers(NETDEV_UP, dev);
4316 call_netdevice_notifiers(NETDEV_DOWN, dev);
4319 if (dev->flags & IFF_UP &&
4320 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4321 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4325 * dev_change_flags - change device settings
4327 * @flags: device state flags
4329 * Change settings on device based state flags. The flags are
4330 * in the userspace exported format.
4332 int dev_change_flags(struct net_device *dev, unsigned flags)
4335 int old_flags = dev->flags;
4337 ret = __dev_change_flags(dev, flags);
4341 changes = old_flags ^ dev->flags;
4343 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4345 __dev_notify_flags(dev, old_flags);
4348 EXPORT_SYMBOL(dev_change_flags);
4351 * dev_set_mtu - Change maximum transfer unit
4353 * @new_mtu: new transfer unit
4355 * Change the maximum transfer size of the network device.
4357 int dev_set_mtu(struct net_device *dev, int new_mtu)
4359 const struct net_device_ops *ops = dev->netdev_ops;
4362 if (new_mtu == dev->mtu)
4365 /* MTU must be positive. */
4369 if (!netif_device_present(dev))
4373 if (ops->ndo_change_mtu)
4374 err = ops->ndo_change_mtu(dev, new_mtu);
4378 if (!err && dev->flags & IFF_UP)
4379 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4382 EXPORT_SYMBOL(dev_set_mtu);
4385 * dev_set_mac_address - Change Media Access Control Address
4389 * Change the hardware (MAC) address of the device
4391 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4393 const struct net_device_ops *ops = dev->netdev_ops;
4396 if (!ops->ndo_set_mac_address)
4398 if (sa->sa_family != dev->type)
4400 if (!netif_device_present(dev))
4402 err = ops->ndo_set_mac_address(dev, sa);
4404 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4407 EXPORT_SYMBOL(dev_set_mac_address);
4410 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4412 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4415 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4421 case SIOCGIFFLAGS: /* Get interface flags */
4422 ifr->ifr_flags = (short) dev_get_flags(dev);
4425 case SIOCGIFMETRIC: /* Get the metric on the interface
4426 (currently unused) */
4427 ifr->ifr_metric = 0;
4430 case SIOCGIFMTU: /* Get the MTU of a device */
4431 ifr->ifr_mtu = dev->mtu;
4436 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4438 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4439 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4440 ifr->ifr_hwaddr.sa_family = dev->type;
4448 ifr->ifr_map.mem_start = dev->mem_start;
4449 ifr->ifr_map.mem_end = dev->mem_end;
4450 ifr->ifr_map.base_addr = dev->base_addr;
4451 ifr->ifr_map.irq = dev->irq;
4452 ifr->ifr_map.dma = dev->dma;
4453 ifr->ifr_map.port = dev->if_port;
4457 ifr->ifr_ifindex = dev->ifindex;
4461 ifr->ifr_qlen = dev->tx_queue_len;
4465 /* dev_ioctl() should ensure this case
4477 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4479 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4482 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4483 const struct net_device_ops *ops;
4488 ops = dev->netdev_ops;
4491 case SIOCSIFFLAGS: /* Set interface flags */
4492 return dev_change_flags(dev, ifr->ifr_flags);
4494 case SIOCSIFMETRIC: /* Set the metric on the interface
4495 (currently unused) */
4498 case SIOCSIFMTU: /* Set the MTU of a device */
4499 return dev_set_mtu(dev, ifr->ifr_mtu);
4502 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4504 case SIOCSIFHWBROADCAST:
4505 if (ifr->ifr_hwaddr.sa_family != dev->type)
4507 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4508 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4509 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4513 if (ops->ndo_set_config) {
4514 if (!netif_device_present(dev))
4516 return ops->ndo_set_config(dev, &ifr->ifr_map);
4521 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4522 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4524 if (!netif_device_present(dev))
4526 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4529 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4530 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4532 if (!netif_device_present(dev))
4534 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4537 if (ifr->ifr_qlen < 0)
4539 dev->tx_queue_len = ifr->ifr_qlen;
4543 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4544 return dev_change_name(dev, ifr->ifr_newname);
4547 * Unknown or private ioctl
4550 if ((cmd >= SIOCDEVPRIVATE &&
4551 cmd <= SIOCDEVPRIVATE + 15) ||
4552 cmd == SIOCBONDENSLAVE ||
4553 cmd == SIOCBONDRELEASE ||
4554 cmd == SIOCBONDSETHWADDR ||
4555 cmd == SIOCBONDSLAVEINFOQUERY ||
4556 cmd == SIOCBONDINFOQUERY ||
4557 cmd == SIOCBONDCHANGEACTIVE ||
4558 cmd == SIOCGMIIPHY ||
4559 cmd == SIOCGMIIREG ||
4560 cmd == SIOCSMIIREG ||
4561 cmd == SIOCBRADDIF ||
4562 cmd == SIOCBRDELIF ||
4563 cmd == SIOCSHWTSTAMP ||
4564 cmd == SIOCWANDEV) {
4566 if (ops->ndo_do_ioctl) {
4567 if (netif_device_present(dev))
4568 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4580 * This function handles all "interface"-type I/O control requests. The actual
4581 * 'doing' part of this is dev_ifsioc above.
4585 * dev_ioctl - network device ioctl
4586 * @net: the applicable net namespace
4587 * @cmd: command to issue
4588 * @arg: pointer to a struct ifreq in user space
4590 * Issue ioctl functions to devices. This is normally called by the
4591 * user space syscall interfaces but can sometimes be useful for
4592 * other purposes. The return value is the return from the syscall if
4593 * positive or a negative errno code on error.
4596 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4602 /* One special case: SIOCGIFCONF takes ifconf argument
4603 and requires shared lock, because it sleeps writing
4607 if (cmd == SIOCGIFCONF) {
4609 ret = dev_ifconf(net, (char __user *) arg);
4613 if (cmd == SIOCGIFNAME)
4614 return dev_ifname(net, (struct ifreq __user *)arg);
4616 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4619 ifr.ifr_name[IFNAMSIZ-1] = 0;
4621 colon = strchr(ifr.ifr_name, ':');
4626 * See which interface the caller is talking about.
4631 * These ioctl calls:
4632 * - can be done by all.
4633 * - atomic and do not require locking.
4644 dev_load(net, ifr.ifr_name);
4646 ret = dev_ifsioc_locked(net, &ifr, cmd);
4651 if (copy_to_user(arg, &ifr,
4652 sizeof(struct ifreq)))
4658 dev_load(net, ifr.ifr_name);
4660 ret = dev_ethtool(net, &ifr);
4665 if (copy_to_user(arg, &ifr,
4666 sizeof(struct ifreq)))
4672 * These ioctl calls:
4673 * - require superuser power.
4674 * - require strict serialization.
4680 if (!capable(CAP_NET_ADMIN))
4682 dev_load(net, ifr.ifr_name);
4684 ret = dev_ifsioc(net, &ifr, cmd);
4689 if (copy_to_user(arg, &ifr,
4690 sizeof(struct ifreq)))
4696 * These ioctl calls:
4697 * - require superuser power.
4698 * - require strict serialization.
4699 * - do not return a value
4709 case SIOCSIFHWBROADCAST:
4712 case SIOCBONDENSLAVE:
4713 case SIOCBONDRELEASE:
4714 case SIOCBONDSETHWADDR:
4715 case SIOCBONDCHANGEACTIVE:
4719 if (!capable(CAP_NET_ADMIN))
4722 case SIOCBONDSLAVEINFOQUERY:
4723 case SIOCBONDINFOQUERY:
4724 dev_load(net, ifr.ifr_name);
4726 ret = dev_ifsioc(net, &ifr, cmd);
4731 /* Get the per device memory space. We can add this but
4732 * currently do not support it */
4734 /* Set the per device memory buffer space.
4735 * Not applicable in our case */
4740 * Unknown or private ioctl.
4743 if (cmd == SIOCWANDEV ||
4744 (cmd >= SIOCDEVPRIVATE &&
4745 cmd <= SIOCDEVPRIVATE + 15)) {
4746 dev_load(net, ifr.ifr_name);
4748 ret = dev_ifsioc(net, &ifr, cmd);
4750 if (!ret && copy_to_user(arg, &ifr,
4751 sizeof(struct ifreq)))
4755 /* Take care of Wireless Extensions */
4756 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4757 return wext_handle_ioctl(net, &ifr, cmd, arg);
4764 * dev_new_index - allocate an ifindex
4765 * @net: the applicable net namespace
4767 * Returns a suitable unique value for a new device interface
4768 * number. The caller must hold the rtnl semaphore or the
4769 * dev_base_lock to be sure it remains unique.
4771 static int dev_new_index(struct net *net)
4777 if (!__dev_get_by_index(net, ifindex))
4782 /* Delayed registration/unregisteration */
4783 static LIST_HEAD(net_todo_list);
4785 static void net_set_todo(struct net_device *dev)
4787 list_add_tail(&dev->todo_list, &net_todo_list);
4790 static void rollback_registered_many(struct list_head *head)
4792 struct net_device *dev, *tmp;
4794 BUG_ON(dev_boot_phase);
4797 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4798 /* Some devices call without registering
4799 * for initialization unwind. Remove those
4800 * devices and proceed with the remaining.
4802 if (dev->reg_state == NETREG_UNINITIALIZED) {
4803 pr_debug("unregister_netdevice: device %s/%p never "
4804 "was registered\n", dev->name, dev);
4807 list_del(&dev->unreg_list);
4811 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4813 /* If device is running, close it first. */
4816 /* And unlink it from device chain. */
4817 unlist_netdevice(dev);
4819 dev->reg_state = NETREG_UNREGISTERING;
4824 list_for_each_entry(dev, head, unreg_list) {
4825 /* Shutdown queueing discipline. */
4829 /* Notify protocols, that we are about to destroy
4830 this device. They should clean all the things.
4832 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4834 if (!dev->rtnl_link_ops ||
4835 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4836 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4839 * Flush the unicast and multicast chains
4844 if (dev->netdev_ops->ndo_uninit)
4845 dev->netdev_ops->ndo_uninit(dev);
4847 /* Notifier chain MUST detach us from master device. */
4848 WARN_ON(dev->master);
4850 /* Remove entries from kobject tree */
4851 netdev_unregister_kobject(dev);
4854 /* Process any work delayed until the end of the batch */
4855 dev = list_first_entry(head, struct net_device, unreg_list);
4856 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4860 list_for_each_entry(dev, head, unreg_list)
4864 static void rollback_registered(struct net_device *dev)
4868 list_add(&dev->unreg_list, &single);
4869 rollback_registered_many(&single);
4872 static void __netdev_init_queue_locks_one(struct net_device *dev,
4873 struct netdev_queue *dev_queue,
4876 spin_lock_init(&dev_queue->_xmit_lock);
4877 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4878 dev_queue->xmit_lock_owner = -1;
4881 static void netdev_init_queue_locks(struct net_device *dev)
4883 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4884 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4887 unsigned long netdev_fix_features(unsigned long features, const char *name)
4889 /* Fix illegal SG+CSUM combinations. */
4890 if ((features & NETIF_F_SG) &&
4891 !(features & NETIF_F_ALL_CSUM)) {
4893 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4894 "checksum feature.\n", name);
4895 features &= ~NETIF_F_SG;
4898 /* TSO requires that SG is present as well. */
4899 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4901 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4902 "SG feature.\n", name);
4903 features &= ~NETIF_F_TSO;
4906 if (features & NETIF_F_UFO) {
4907 if (!(features & NETIF_F_GEN_CSUM)) {
4909 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4910 "since no NETIF_F_HW_CSUM feature.\n",
4912 features &= ~NETIF_F_UFO;
4915 if (!(features & NETIF_F_SG)) {
4917 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4918 "since no NETIF_F_SG feature.\n", name);
4919 features &= ~NETIF_F_UFO;
4925 EXPORT_SYMBOL(netdev_fix_features);
4928 * netif_stacked_transfer_operstate - transfer operstate
4929 * @rootdev: the root or lower level device to transfer state from
4930 * @dev: the device to transfer operstate to
4932 * Transfer operational state from root to device. This is normally
4933 * called when a stacking relationship exists between the root
4934 * device and the device(a leaf device).
4936 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4937 struct net_device *dev)
4939 if (rootdev->operstate == IF_OPER_DORMANT)
4940 netif_dormant_on(dev);
4942 netif_dormant_off(dev);
4944 if (netif_carrier_ok(rootdev)) {
4945 if (!netif_carrier_ok(dev))
4946 netif_carrier_on(dev);
4948 if (netif_carrier_ok(dev))
4949 netif_carrier_off(dev);
4952 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4955 * register_netdevice - register a network device
4956 * @dev: device to register
4958 * Take a completed network device structure and add it to the kernel
4959 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4960 * chain. 0 is returned on success. A negative errno code is returned
4961 * on a failure to set up the device, or if the name is a duplicate.
4963 * Callers must hold the rtnl semaphore. You may want
4964 * register_netdev() instead of this.
4967 * The locking appears insufficient to guarantee two parallel registers
4968 * will not get the same name.
4971 int register_netdevice(struct net_device *dev)
4974 struct net *net = dev_net(dev);
4976 BUG_ON(dev_boot_phase);
4981 /* When net_device's are persistent, this will be fatal. */
4982 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4985 spin_lock_init(&dev->addr_list_lock);
4986 netdev_set_addr_lockdep_class(dev);
4987 netdev_init_queue_locks(dev);
4992 if (!dev->num_rx_queues) {
4994 * Allocate a single RX queue if driver never called
4998 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
5004 dev->_rx->first = dev->_rx;
5005 atomic_set(&dev->_rx->count, 1);
5006 dev->num_rx_queues = 1;
5009 /* Init, if this function is available */
5010 if (dev->netdev_ops->ndo_init) {
5011 ret = dev->netdev_ops->ndo_init(dev);
5019 ret = dev_get_valid_name(dev, dev->name, 0);
5023 dev->ifindex = dev_new_index(net);
5024 if (dev->iflink == -1)
5025 dev->iflink = dev->ifindex;
5027 /* Fix illegal checksum combinations */
5028 if ((dev->features & NETIF_F_HW_CSUM) &&
5029 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5030 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
5032 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5035 if ((dev->features & NETIF_F_NO_CSUM) &&
5036 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5037 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
5039 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5042 dev->features = netdev_fix_features(dev->features, dev->name);
5044 /* Enable software GSO if SG is supported. */
5045 if (dev->features & NETIF_F_SG)
5046 dev->features |= NETIF_F_GSO;
5048 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5049 ret = notifier_to_errno(ret);
5053 ret = netdev_register_kobject(dev);
5056 dev->reg_state = NETREG_REGISTERED;
5059 * Default initial state at registry is that the
5060 * device is present.
5063 set_bit(__LINK_STATE_PRESENT, &dev->state);
5065 dev_init_scheduler(dev);
5067 list_netdevice(dev);
5069 /* Notify protocols, that a new device appeared. */
5070 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5071 ret = notifier_to_errno(ret);
5073 rollback_registered(dev);
5074 dev->reg_state = NETREG_UNREGISTERED;
5077 * Prevent userspace races by waiting until the network
5078 * device is fully setup before sending notifications.
5080 if (!dev->rtnl_link_ops ||
5081 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5082 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5088 if (dev->netdev_ops->ndo_uninit)
5089 dev->netdev_ops->ndo_uninit(dev);
5092 EXPORT_SYMBOL(register_netdevice);
5095 * init_dummy_netdev - init a dummy network device for NAPI
5096 * @dev: device to init
5098 * This takes a network device structure and initialize the minimum
5099 * amount of fields so it can be used to schedule NAPI polls without
5100 * registering a full blown interface. This is to be used by drivers
5101 * that need to tie several hardware interfaces to a single NAPI
5102 * poll scheduler due to HW limitations.
5104 int init_dummy_netdev(struct net_device *dev)
5106 /* Clear everything. Note we don't initialize spinlocks
5107 * are they aren't supposed to be taken by any of the
5108 * NAPI code and this dummy netdev is supposed to be
5109 * only ever used for NAPI polls
5111 memset(dev, 0, sizeof(struct net_device));
5113 /* make sure we BUG if trying to hit standard
5114 * register/unregister code path
5116 dev->reg_state = NETREG_DUMMY;
5118 /* initialize the ref count */
5119 atomic_set(&dev->refcnt, 1);
5121 /* NAPI wants this */
5122 INIT_LIST_HEAD(&dev->napi_list);
5124 /* a dummy interface is started by default */
5125 set_bit(__LINK_STATE_PRESENT, &dev->state);
5126 set_bit(__LINK_STATE_START, &dev->state);
5130 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5134 * register_netdev - register a network device
5135 * @dev: device to register
5137 * Take a completed network device structure and add it to the kernel
5138 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5139 * chain. 0 is returned on success. A negative errno code is returned
5140 * on a failure to set up the device, or if the name is a duplicate.
5142 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5143 * and expands the device name if you passed a format string to
5146 int register_netdev(struct net_device *dev)
5153 * If the name is a format string the caller wants us to do a
5156 if (strchr(dev->name, '%')) {
5157 err = dev_alloc_name(dev, dev->name);
5162 err = register_netdevice(dev);
5167 EXPORT_SYMBOL(register_netdev);
5170 * netdev_wait_allrefs - wait until all references are gone.
5172 * This is called when unregistering network devices.
5174 * Any protocol or device that holds a reference should register
5175 * for netdevice notification, and cleanup and put back the
5176 * reference if they receive an UNREGISTER event.
5177 * We can get stuck here if buggy protocols don't correctly
5180 static void netdev_wait_allrefs(struct net_device *dev)
5182 unsigned long rebroadcast_time, warning_time;
5184 linkwatch_forget_dev(dev);
5186 rebroadcast_time = warning_time = jiffies;
5187 while (atomic_read(&dev->refcnt) != 0) {
5188 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5191 /* Rebroadcast unregister notification */
5192 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5193 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5194 * should have already handle it the first time */
5196 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5198 /* We must not have linkwatch events
5199 * pending on unregister. If this
5200 * happens, we simply run the queue
5201 * unscheduled, resulting in a noop
5204 linkwatch_run_queue();
5209 rebroadcast_time = jiffies;
5214 if (time_after(jiffies, warning_time + 10 * HZ)) {
5215 printk(KERN_EMERG "unregister_netdevice: "
5216 "waiting for %s to become free. Usage "
5218 dev->name, atomic_read(&dev->refcnt));
5219 warning_time = jiffies;
5228 * register_netdevice(x1);
5229 * register_netdevice(x2);
5231 * unregister_netdevice(y1);
5232 * unregister_netdevice(y2);
5238 * We are invoked by rtnl_unlock().
5239 * This allows us to deal with problems:
5240 * 1) We can delete sysfs objects which invoke hotplug
5241 * without deadlocking with linkwatch via keventd.
5242 * 2) Since we run with the RTNL semaphore not held, we can sleep
5243 * safely in order to wait for the netdev refcnt to drop to zero.
5245 * We must not return until all unregister events added during
5246 * the interval the lock was held have been completed.
5248 void netdev_run_todo(void)
5250 struct list_head list;
5252 /* Snapshot list, allow later requests */
5253 list_replace_init(&net_todo_list, &list);
5257 while (!list_empty(&list)) {
5258 struct net_device *dev
5259 = list_first_entry(&list, struct net_device, todo_list);
5260 list_del(&dev->todo_list);
5262 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5263 printk(KERN_ERR "network todo '%s' but state %d\n",
5264 dev->name, dev->reg_state);
5269 dev->reg_state = NETREG_UNREGISTERED;
5271 on_each_cpu(flush_backlog, dev, 1);
5273 netdev_wait_allrefs(dev);
5276 BUG_ON(atomic_read(&dev->refcnt));
5277 WARN_ON(dev->ip_ptr);
5278 WARN_ON(dev->ip6_ptr);
5279 WARN_ON(dev->dn_ptr);
5281 if (dev->destructor)
5282 dev->destructor(dev);
5284 /* Free network device */
5285 kobject_put(&dev->dev.kobj);
5290 * dev_txq_stats_fold - fold tx_queues stats
5291 * @dev: device to get statistics from
5292 * @stats: struct rtnl_link_stats64 to hold results
5294 void dev_txq_stats_fold(const struct net_device *dev,
5295 struct rtnl_link_stats64 *stats)
5297 u64 tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5299 struct netdev_queue *txq;
5301 for (i = 0; i < dev->num_tx_queues; i++) {
5302 txq = netdev_get_tx_queue(dev, i);
5303 spin_lock_bh(&txq->_xmit_lock);
5304 tx_bytes += txq->tx_bytes;
5305 tx_packets += txq->tx_packets;
5306 tx_dropped += txq->tx_dropped;
5307 spin_unlock_bh(&txq->_xmit_lock);
5309 if (tx_bytes || tx_packets || tx_dropped) {
5310 stats->tx_bytes = tx_bytes;
5311 stats->tx_packets = tx_packets;
5312 stats->tx_dropped = tx_dropped;
5315 EXPORT_SYMBOL(dev_txq_stats_fold);
5317 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5318 * fields in the same order, with only the type differing.
5320 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5321 const struct net_device_stats *netdev_stats)
5323 #if BITS_PER_LONG == 64
5324 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5325 memcpy(stats64, netdev_stats, sizeof(*stats64));
5327 size_t i, n = sizeof(*stats64) / sizeof(u64);
5328 const unsigned long *src = (const unsigned long *)netdev_stats;
5329 u64 *dst = (u64 *)stats64;
5331 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5332 sizeof(*stats64) / sizeof(u64));
5333 for (i = 0; i < n; i++)
5339 * dev_get_stats - get network device statistics
5340 * @dev: device to get statistics from
5341 * @storage: place to store stats
5343 * Get network statistics from device. Return @storage.
5344 * The device driver may provide its own method by setting
5345 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5346 * otherwise the internal statistics structure is used.
5348 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5349 struct rtnl_link_stats64 *storage)
5351 const struct net_device_ops *ops = dev->netdev_ops;
5353 if (ops->ndo_get_stats64) {
5354 memset(storage, 0, sizeof(*storage));
5355 return ops->ndo_get_stats64(dev, storage);
5357 if (ops->ndo_get_stats) {
5358 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5361 netdev_stats_to_stats64(storage, &dev->stats);
5362 dev_txq_stats_fold(dev, storage);
5365 EXPORT_SYMBOL(dev_get_stats);
5367 static void netdev_init_one_queue(struct net_device *dev,
5368 struct netdev_queue *queue,
5374 static void netdev_init_queues(struct net_device *dev)
5376 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5377 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5378 spin_lock_init(&dev->tx_global_lock);
5382 * alloc_netdev_mq - allocate network device
5383 * @sizeof_priv: size of private data to allocate space for
5384 * @name: device name format string
5385 * @setup: callback to initialize device
5386 * @queue_count: the number of subqueues to allocate
5388 * Allocates a struct net_device with private data area for driver use
5389 * and performs basic initialization. Also allocates subquue structs
5390 * for each queue on the device at the end of the netdevice.
5392 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5393 void (*setup)(struct net_device *), unsigned int queue_count)
5395 struct netdev_queue *tx;
5396 struct net_device *dev;
5398 struct net_device *p;
5400 struct netdev_rx_queue *rx;
5404 BUG_ON(strlen(name) >= sizeof(dev->name));
5406 alloc_size = sizeof(struct net_device);
5408 /* ensure 32-byte alignment of private area */
5409 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5410 alloc_size += sizeof_priv;
5412 /* ensure 32-byte alignment of whole construct */
5413 alloc_size += NETDEV_ALIGN - 1;
5415 p = kzalloc(alloc_size, GFP_KERNEL);
5417 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5421 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5423 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5429 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5431 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5436 atomic_set(&rx->count, queue_count);
5439 * Set a pointer to first element in the array which holds the
5442 for (i = 0; i < queue_count; i++)
5446 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5447 dev->padded = (char *)dev - (char *)p;
5449 if (dev_addr_init(dev))
5455 dev_net_set(dev, &init_net);
5458 dev->num_tx_queues = queue_count;
5459 dev->real_num_tx_queues = queue_count;
5463 dev->num_rx_queues = queue_count;
5466 dev->gso_max_size = GSO_MAX_SIZE;
5468 netdev_init_queues(dev);
5470 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5471 dev->ethtool_ntuple_list.count = 0;
5472 INIT_LIST_HEAD(&dev->napi_list);
5473 INIT_LIST_HEAD(&dev->unreg_list);
5474 INIT_LIST_HEAD(&dev->link_watch_list);
5475 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5477 strcpy(dev->name, name);
5490 EXPORT_SYMBOL(alloc_netdev_mq);
5493 * free_netdev - free network device
5496 * This function does the last stage of destroying an allocated device
5497 * interface. The reference to the device object is released.
5498 * If this is the last reference then it will be freed.
5500 void free_netdev(struct net_device *dev)
5502 struct napi_struct *p, *n;
5504 release_net(dev_net(dev));
5508 /* Flush device addresses */
5509 dev_addr_flush(dev);
5511 /* Clear ethtool n-tuple list */
5512 ethtool_ntuple_flush(dev);
5514 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5517 /* Compatibility with error handling in drivers */
5518 if (dev->reg_state == NETREG_UNINITIALIZED) {
5519 kfree((char *)dev - dev->padded);
5523 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5524 dev->reg_state = NETREG_RELEASED;
5526 /* will free via device release */
5527 put_device(&dev->dev);
5529 EXPORT_SYMBOL(free_netdev);
5532 * synchronize_net - Synchronize with packet receive processing
5534 * Wait for packets currently being received to be done.
5535 * Does not block later packets from starting.
5537 void synchronize_net(void)
5542 EXPORT_SYMBOL(synchronize_net);
5545 * unregister_netdevice_queue - remove device from the kernel
5549 * This function shuts down a device interface and removes it
5550 * from the kernel tables.
5551 * If head not NULL, device is queued to be unregistered later.
5553 * Callers must hold the rtnl semaphore. You may want
5554 * unregister_netdev() instead of this.
5557 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5562 list_move_tail(&dev->unreg_list, head);
5564 rollback_registered(dev);
5565 /* Finish processing unregister after unlock */
5569 EXPORT_SYMBOL(unregister_netdevice_queue);
5572 * unregister_netdevice_many - unregister many devices
5573 * @head: list of devices
5575 void unregister_netdevice_many(struct list_head *head)
5577 struct net_device *dev;
5579 if (!list_empty(head)) {
5580 rollback_registered_many(head);
5581 list_for_each_entry(dev, head, unreg_list)
5585 EXPORT_SYMBOL(unregister_netdevice_many);
5588 * unregister_netdev - remove device from the kernel
5591 * This function shuts down a device interface and removes it
5592 * from the kernel tables.
5594 * This is just a wrapper for unregister_netdevice that takes
5595 * the rtnl semaphore. In general you want to use this and not
5596 * unregister_netdevice.
5598 void unregister_netdev(struct net_device *dev)
5601 unregister_netdevice(dev);
5604 EXPORT_SYMBOL(unregister_netdev);
5607 * dev_change_net_namespace - move device to different nethost namespace
5609 * @net: network namespace
5610 * @pat: If not NULL name pattern to try if the current device name
5611 * is already taken in the destination network namespace.
5613 * This function shuts down a device interface and moves it
5614 * to a new network namespace. On success 0 is returned, on
5615 * a failure a netagive errno code is returned.
5617 * Callers must hold the rtnl semaphore.
5620 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5626 /* Don't allow namespace local devices to be moved. */
5628 if (dev->features & NETIF_F_NETNS_LOCAL)
5631 /* Ensure the device has been registrered */
5633 if (dev->reg_state != NETREG_REGISTERED)
5636 /* Get out if there is nothing todo */
5638 if (net_eq(dev_net(dev), net))
5641 /* Pick the destination device name, and ensure
5642 * we can use it in the destination network namespace.
5645 if (__dev_get_by_name(net, dev->name)) {
5646 /* We get here if we can't use the current device name */
5649 if (dev_get_valid_name(dev, pat, 1))
5654 * And now a mini version of register_netdevice unregister_netdevice.
5657 /* If device is running close it first. */
5660 /* And unlink it from device chain */
5662 unlist_netdevice(dev);
5666 /* Shutdown queueing discipline. */
5669 /* Notify protocols, that we are about to destroy
5670 this device. They should clean all the things.
5672 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5673 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5676 * Flush the unicast and multicast chains
5681 /* Actually switch the network namespace */
5682 dev_net_set(dev, net);
5684 /* If there is an ifindex conflict assign a new one */
5685 if (__dev_get_by_index(net, dev->ifindex)) {
5686 int iflink = (dev->iflink == dev->ifindex);
5687 dev->ifindex = dev_new_index(net);
5689 dev->iflink = dev->ifindex;
5692 /* Fixup kobjects */
5693 err = device_rename(&dev->dev, dev->name);
5696 /* Add the device back in the hashes */
5697 list_netdevice(dev);
5699 /* Notify protocols, that a new device appeared. */
5700 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5703 * Prevent userspace races by waiting until the network
5704 * device is fully setup before sending notifications.
5706 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5713 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5715 static int dev_cpu_callback(struct notifier_block *nfb,
5716 unsigned long action,
5719 struct sk_buff **list_skb;
5720 struct sk_buff *skb;
5721 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5722 struct softnet_data *sd, *oldsd;
5724 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5727 local_irq_disable();
5728 cpu = smp_processor_id();
5729 sd = &per_cpu(softnet_data, cpu);
5730 oldsd = &per_cpu(softnet_data, oldcpu);
5732 /* Find end of our completion_queue. */
5733 list_skb = &sd->completion_queue;
5735 list_skb = &(*list_skb)->next;
5736 /* Append completion queue from offline CPU. */
5737 *list_skb = oldsd->completion_queue;
5738 oldsd->completion_queue = NULL;
5740 /* Append output queue from offline CPU. */
5741 if (oldsd->output_queue) {
5742 *sd->output_queue_tailp = oldsd->output_queue;
5743 sd->output_queue_tailp = oldsd->output_queue_tailp;
5744 oldsd->output_queue = NULL;
5745 oldsd->output_queue_tailp = &oldsd->output_queue;
5748 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5751 /* Process offline CPU's input_pkt_queue */
5752 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
5754 input_queue_head_incr(oldsd);
5756 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5758 input_queue_head_incr(oldsd);
5766 * netdev_increment_features - increment feature set by one
5767 * @all: current feature set
5768 * @one: new feature set
5769 * @mask: mask feature set
5771 * Computes a new feature set after adding a device with feature set
5772 * @one to the master device with current feature set @all. Will not
5773 * enable anything that is off in @mask. Returns the new feature set.
5775 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5778 /* If device needs checksumming, downgrade to it. */
5779 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5780 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5781 else if (mask & NETIF_F_ALL_CSUM) {
5782 /* If one device supports v4/v6 checksumming, set for all. */
5783 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5784 !(all & NETIF_F_GEN_CSUM)) {
5785 all &= ~NETIF_F_ALL_CSUM;
5786 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5789 /* If one device supports hw checksumming, set for all. */
5790 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5791 all &= ~NETIF_F_ALL_CSUM;
5792 all |= NETIF_F_HW_CSUM;
5796 one |= NETIF_F_ALL_CSUM;
5798 one |= all & NETIF_F_ONE_FOR_ALL;
5799 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5800 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5804 EXPORT_SYMBOL(netdev_increment_features);
5806 static struct hlist_head *netdev_create_hash(void)
5809 struct hlist_head *hash;
5811 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5813 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5814 INIT_HLIST_HEAD(&hash[i]);
5819 /* Initialize per network namespace state */
5820 static int __net_init netdev_init(struct net *net)
5822 INIT_LIST_HEAD(&net->dev_base_head);
5824 net->dev_name_head = netdev_create_hash();
5825 if (net->dev_name_head == NULL)
5828 net->dev_index_head = netdev_create_hash();
5829 if (net->dev_index_head == NULL)
5835 kfree(net->dev_name_head);
5841 * netdev_drivername - network driver for the device
5842 * @dev: network device
5843 * @buffer: buffer for resulting name
5844 * @len: size of buffer
5846 * Determine network driver for device.
5848 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5850 const struct device_driver *driver;
5851 const struct device *parent;
5853 if (len <= 0 || !buffer)
5857 parent = dev->dev.parent;
5862 driver = parent->driver;
5863 if (driver && driver->name)
5864 strlcpy(buffer, driver->name, len);
5868 static int __netdev_printk(const char *level, const struct net_device *dev,
5869 struct va_format *vaf)
5873 if (dev && dev->dev.parent)
5874 r = dev_printk(level, dev->dev.parent, "%s: %pV",
5875 netdev_name(dev), vaf);
5877 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
5879 r = printk("%s(NULL net_device): %pV", level, vaf);
5884 int netdev_printk(const char *level, const struct net_device *dev,
5885 const char *format, ...)
5887 struct va_format vaf;
5891 va_start(args, format);
5896 r = __netdev_printk(level, dev, &vaf);
5901 EXPORT_SYMBOL(netdev_printk);
5903 #define define_netdev_printk_level(func, level) \
5904 int func(const struct net_device *dev, const char *fmt, ...) \
5907 struct va_format vaf; \
5910 va_start(args, fmt); \
5915 r = __netdev_printk(level, dev, &vaf); \
5920 EXPORT_SYMBOL(func);
5922 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
5923 define_netdev_printk_level(netdev_alert, KERN_ALERT);
5924 define_netdev_printk_level(netdev_crit, KERN_CRIT);
5925 define_netdev_printk_level(netdev_err, KERN_ERR);
5926 define_netdev_printk_level(netdev_warn, KERN_WARNING);
5927 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
5928 define_netdev_printk_level(netdev_info, KERN_INFO);
5930 static void __net_exit netdev_exit(struct net *net)
5932 kfree(net->dev_name_head);
5933 kfree(net->dev_index_head);
5936 static struct pernet_operations __net_initdata netdev_net_ops = {
5937 .init = netdev_init,
5938 .exit = netdev_exit,
5941 static void __net_exit default_device_exit(struct net *net)
5943 struct net_device *dev, *aux;
5945 * Push all migratable network devices back to the
5946 * initial network namespace
5949 for_each_netdev_safe(net, dev, aux) {
5951 char fb_name[IFNAMSIZ];
5953 /* Ignore unmoveable devices (i.e. loopback) */
5954 if (dev->features & NETIF_F_NETNS_LOCAL)
5957 /* Leave virtual devices for the generic cleanup */
5958 if (dev->rtnl_link_ops)
5961 /* Push remaing network devices to init_net */
5962 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5963 err = dev_change_net_namespace(dev, &init_net, fb_name);
5965 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5966 __func__, dev->name, err);
5973 static void __net_exit default_device_exit_batch(struct list_head *net_list)
5975 /* At exit all network devices most be removed from a network
5976 * namespace. Do this in the reverse order of registeration.
5977 * Do this across as many network namespaces as possible to
5978 * improve batching efficiency.
5980 struct net_device *dev;
5982 LIST_HEAD(dev_kill_list);
5985 list_for_each_entry(net, net_list, exit_list) {
5986 for_each_netdev_reverse(net, dev) {
5987 if (dev->rtnl_link_ops)
5988 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
5990 unregister_netdevice_queue(dev, &dev_kill_list);
5993 unregister_netdevice_many(&dev_kill_list);
5997 static struct pernet_operations __net_initdata default_device_ops = {
5998 .exit = default_device_exit,
5999 .exit_batch = default_device_exit_batch,
6003 * Initialize the DEV module. At boot time this walks the device list and
6004 * unhooks any devices that fail to initialise (normally hardware not
6005 * present) and leaves us with a valid list of present and active devices.
6010 * This is called single threaded during boot, so no need
6011 * to take the rtnl semaphore.
6013 static int __init net_dev_init(void)
6015 int i, rc = -ENOMEM;
6017 BUG_ON(!dev_boot_phase);
6019 if (dev_proc_init())
6022 if (netdev_kobject_init())
6025 INIT_LIST_HEAD(&ptype_all);
6026 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6027 INIT_LIST_HEAD(&ptype_base[i]);
6029 if (register_pernet_subsys(&netdev_net_ops))
6033 * Initialise the packet receive queues.
6036 for_each_possible_cpu(i) {
6037 struct softnet_data *sd = &per_cpu(softnet_data, i);
6039 memset(sd, 0, sizeof(*sd));
6040 skb_queue_head_init(&sd->input_pkt_queue);
6041 skb_queue_head_init(&sd->process_queue);
6042 sd->completion_queue = NULL;
6043 INIT_LIST_HEAD(&sd->poll_list);
6044 sd->output_queue = NULL;
6045 sd->output_queue_tailp = &sd->output_queue;
6047 sd->csd.func = rps_trigger_softirq;
6053 sd->backlog.poll = process_backlog;
6054 sd->backlog.weight = weight_p;
6055 sd->backlog.gro_list = NULL;
6056 sd->backlog.gro_count = 0;
6061 /* The loopback device is special if any other network devices
6062 * is present in a network namespace the loopback device must
6063 * be present. Since we now dynamically allocate and free the
6064 * loopback device ensure this invariant is maintained by
6065 * keeping the loopback device as the first device on the
6066 * list of network devices. Ensuring the loopback devices
6067 * is the first device that appears and the last network device
6070 if (register_pernet_device(&loopback_net_ops))
6073 if (register_pernet_device(&default_device_ops))
6076 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6077 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6079 hotcpu_notifier(dev_cpu_callback, 0);
6087 subsys_initcall(net_dev_init);
6089 static int __init initialize_hashrnd(void)
6091 get_random_bytes(&hashrnd, sizeof(hashrnd));
6095 late_initcall_sync(initialize_hashrnd);