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_GEN_CSUM) ||
1652 ((features & NETIF_F_IP_CSUM) &&
1653 protocol == htons(ETH_P_IP)) ||
1654 ((features & NETIF_F_IPV6_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 struct sock *sk = skb->sk;
2063 queue_index = sk_tx_queue_get(sk);
2064 if (queue_index < 0) {
2065 const struct net_device_ops *ops = dev->netdev_ops;
2067 if (ops->ndo_select_queue) {
2068 queue_index = ops->ndo_select_queue(dev, skb);
2069 queue_index = dev_cap_txqueue(dev, queue_index);
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;
2522 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2524 cpu = smp_processor_id();
2526 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2533 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2539 EXPORT_SYMBOL(netif_rx);
2541 int netif_rx_ni(struct sk_buff *skb)
2546 err = netif_rx(skb);
2547 if (local_softirq_pending())
2553 EXPORT_SYMBOL(netif_rx_ni);
2555 static void net_tx_action(struct softirq_action *h)
2557 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2559 if (sd->completion_queue) {
2560 struct sk_buff *clist;
2562 local_irq_disable();
2563 clist = sd->completion_queue;
2564 sd->completion_queue = NULL;
2568 struct sk_buff *skb = clist;
2569 clist = clist->next;
2571 WARN_ON(atomic_read(&skb->users));
2576 if (sd->output_queue) {
2579 local_irq_disable();
2580 head = sd->output_queue;
2581 sd->output_queue = NULL;
2582 sd->output_queue_tailp = &sd->output_queue;
2586 struct Qdisc *q = head;
2587 spinlock_t *root_lock;
2589 head = head->next_sched;
2591 root_lock = qdisc_lock(q);
2592 if (spin_trylock(root_lock)) {
2593 smp_mb__before_clear_bit();
2594 clear_bit(__QDISC_STATE_SCHED,
2597 spin_unlock(root_lock);
2599 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2601 __netif_reschedule(q);
2603 smp_mb__before_clear_bit();
2604 clear_bit(__QDISC_STATE_SCHED,
2612 static inline int deliver_skb(struct sk_buff *skb,
2613 struct packet_type *pt_prev,
2614 struct net_device *orig_dev)
2616 atomic_inc(&skb->users);
2617 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2620 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
2621 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
2622 /* This hook is defined here for ATM LANE */
2623 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2624 unsigned char *addr) __read_mostly;
2625 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2628 #ifdef CONFIG_NET_CLS_ACT
2629 /* TODO: Maybe we should just force sch_ingress to be compiled in
2630 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2631 * a compare and 2 stores extra right now if we dont have it on
2632 * but have CONFIG_NET_CLS_ACT
2633 * NOTE: This doesnt stop any functionality; if you dont have
2634 * the ingress scheduler, you just cant add policies on ingress.
2637 static int ing_filter(struct sk_buff *skb)
2639 struct net_device *dev = skb->dev;
2640 u32 ttl = G_TC_RTTL(skb->tc_verd);
2641 struct netdev_queue *rxq;
2642 int result = TC_ACT_OK;
2645 if (unlikely(MAX_RED_LOOP < ttl++)) {
2646 if (net_ratelimit())
2647 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
2648 skb->skb_iif, dev->ifindex);
2652 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2653 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2655 rxq = &dev->rx_queue;
2658 if (q != &noop_qdisc) {
2659 spin_lock(qdisc_lock(q));
2660 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2661 result = qdisc_enqueue_root(skb, q);
2662 spin_unlock(qdisc_lock(q));
2668 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2669 struct packet_type **pt_prev,
2670 int *ret, struct net_device *orig_dev)
2672 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2676 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2680 switch (ing_filter(skb)) {
2694 * netif_nit_deliver - deliver received packets to network taps
2697 * This function is used to deliver incoming packets to network
2698 * taps. It should be used when the normal netif_receive_skb path
2699 * is bypassed, for example because of VLAN acceleration.
2701 void netif_nit_deliver(struct sk_buff *skb)
2703 struct packet_type *ptype;
2705 if (list_empty(&ptype_all))
2708 skb_reset_network_header(skb);
2709 skb_reset_transport_header(skb);
2710 skb->mac_len = skb->network_header - skb->mac_header;
2713 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2714 if (!ptype->dev || ptype->dev == skb->dev)
2715 deliver_skb(skb, ptype, skb->dev);
2721 * netdev_rx_handler_register - register receive handler
2722 * @dev: device to register a handler for
2723 * @rx_handler: receive handler to register
2724 * @rx_handler_data: data pointer that is used by rx handler
2726 * Register a receive hander for a device. This handler will then be
2727 * called from __netif_receive_skb. A negative errno code is returned
2730 * The caller must hold the rtnl_mutex.
2732 int netdev_rx_handler_register(struct net_device *dev,
2733 rx_handler_func_t *rx_handler,
2734 void *rx_handler_data)
2738 if (dev->rx_handler)
2741 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
2742 rcu_assign_pointer(dev->rx_handler, rx_handler);
2746 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
2749 * netdev_rx_handler_unregister - unregister receive handler
2750 * @dev: device to unregister a handler from
2752 * Unregister a receive hander from a device.
2754 * The caller must hold the rtnl_mutex.
2756 void netdev_rx_handler_unregister(struct net_device *dev)
2760 rcu_assign_pointer(dev->rx_handler, NULL);
2761 rcu_assign_pointer(dev->rx_handler_data, NULL);
2763 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
2765 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2766 struct net_device *master)
2768 if (skb->pkt_type == PACKET_HOST) {
2769 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2771 memcpy(dest, master->dev_addr, ETH_ALEN);
2775 /* On bonding slaves other than the currently active slave, suppress
2776 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2777 * ARP on active-backup slaves with arp_validate enabled.
2779 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2781 struct net_device *dev = skb->dev;
2783 if (master->priv_flags & IFF_MASTER_ARPMON)
2784 dev->last_rx = jiffies;
2786 if ((master->priv_flags & IFF_MASTER_ALB) &&
2787 (master->priv_flags & IFF_BRIDGE_PORT)) {
2788 /* Do address unmangle. The local destination address
2789 * will be always the one master has. Provides the right
2790 * functionality in a bridge.
2792 skb_bond_set_mac_by_master(skb, master);
2795 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2796 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2797 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2800 if (master->priv_flags & IFF_MASTER_ALB) {
2801 if (skb->pkt_type != PACKET_BROADCAST &&
2802 skb->pkt_type != PACKET_MULTICAST)
2805 if (master->priv_flags & IFF_MASTER_8023AD &&
2806 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2813 EXPORT_SYMBOL(__skb_bond_should_drop);
2815 static int __netif_receive_skb(struct sk_buff *skb)
2817 struct packet_type *ptype, *pt_prev;
2818 rx_handler_func_t *rx_handler;
2819 struct net_device *orig_dev;
2820 struct net_device *master;
2821 struct net_device *null_or_orig;
2822 struct net_device *orig_or_bond;
2823 int ret = NET_RX_DROP;
2826 if (!netdev_tstamp_prequeue)
2827 net_timestamp_check(skb);
2829 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2830 return NET_RX_SUCCESS;
2832 /* if we've gotten here through NAPI, check netpoll */
2833 if (netpoll_receive_skb(skb))
2837 skb->skb_iif = skb->dev->ifindex;
2840 * bonding note: skbs received on inactive slaves should only
2841 * be delivered to pkt handlers that are exact matches. Also
2842 * the deliver_no_wcard flag will be set. If packet handlers
2843 * are sensitive to duplicate packets these skbs will need to
2844 * be dropped at the handler. The vlan accel path may have
2845 * already set the deliver_no_wcard flag.
2847 null_or_orig = NULL;
2848 orig_dev = skb->dev;
2849 master = ACCESS_ONCE(orig_dev->master);
2850 if (skb->deliver_no_wcard)
2851 null_or_orig = orig_dev;
2853 if (skb_bond_should_drop(skb, master)) {
2854 skb->deliver_no_wcard = 1;
2855 null_or_orig = orig_dev; /* deliver only exact match */
2860 __this_cpu_inc(softnet_data.processed);
2861 skb_reset_network_header(skb);
2862 skb_reset_transport_header(skb);
2863 skb->mac_len = skb->network_header - skb->mac_header;
2869 #ifdef CONFIG_NET_CLS_ACT
2870 if (skb->tc_verd & TC_NCLS) {
2871 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2876 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2877 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2878 ptype->dev == orig_dev) {
2880 ret = deliver_skb(skb, pt_prev, orig_dev);
2885 #ifdef CONFIG_NET_CLS_ACT
2886 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2892 /* Handle special case of bridge or macvlan */
2893 rx_handler = rcu_dereference(skb->dev->rx_handler);
2896 ret = deliver_skb(skb, pt_prev, orig_dev);
2899 skb = rx_handler(skb);
2905 * Make sure frames received on VLAN interfaces stacked on
2906 * bonding interfaces still make their way to any base bonding
2907 * device that may have registered for a specific ptype. The
2908 * handler may have to adjust skb->dev and orig_dev.
2910 orig_or_bond = orig_dev;
2911 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2912 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2913 orig_or_bond = vlan_dev_real_dev(skb->dev);
2916 type = skb->protocol;
2917 list_for_each_entry_rcu(ptype,
2918 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2919 if (ptype->type == type && (ptype->dev == null_or_orig ||
2920 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2921 ptype->dev == orig_or_bond)) {
2923 ret = deliver_skb(skb, pt_prev, orig_dev);
2929 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2932 /* Jamal, now you will not able to escape explaining
2933 * me how you were going to use this. :-)
2944 * netif_receive_skb - process receive buffer from network
2945 * @skb: buffer to process
2947 * netif_receive_skb() is the main receive data processing function.
2948 * It always succeeds. The buffer may be dropped during processing
2949 * for congestion control or by the protocol layers.
2951 * This function may only be called from softirq context and interrupts
2952 * should be enabled.
2954 * Return values (usually ignored):
2955 * NET_RX_SUCCESS: no congestion
2956 * NET_RX_DROP: packet was dropped
2958 int netif_receive_skb(struct sk_buff *skb)
2960 if (netdev_tstamp_prequeue)
2961 net_timestamp_check(skb);
2963 if (skb_defer_rx_timestamp(skb))
2964 return NET_RX_SUCCESS;
2968 struct rps_dev_flow voidflow, *rflow = &voidflow;
2973 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2976 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2980 ret = __netif_receive_skb(skb);
2986 return __netif_receive_skb(skb);
2989 EXPORT_SYMBOL(netif_receive_skb);
2991 /* Network device is going away, flush any packets still pending
2992 * Called with irqs disabled.
2994 static void flush_backlog(void *arg)
2996 struct net_device *dev = arg;
2997 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2998 struct sk_buff *skb, *tmp;
3001 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3002 if (skb->dev == dev) {
3003 __skb_unlink(skb, &sd->input_pkt_queue);
3005 input_queue_head_incr(sd);
3010 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3011 if (skb->dev == dev) {
3012 __skb_unlink(skb, &sd->process_queue);
3014 input_queue_head_incr(sd);
3019 static int napi_gro_complete(struct sk_buff *skb)
3021 struct packet_type *ptype;
3022 __be16 type = skb->protocol;
3023 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3026 if (NAPI_GRO_CB(skb)->count == 1) {
3027 skb_shinfo(skb)->gso_size = 0;
3032 list_for_each_entry_rcu(ptype, head, list) {
3033 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3036 err = ptype->gro_complete(skb);
3042 WARN_ON(&ptype->list == head);
3044 return NET_RX_SUCCESS;
3048 return netif_receive_skb(skb);
3051 static void napi_gro_flush(struct napi_struct *napi)
3053 struct sk_buff *skb, *next;
3055 for (skb = napi->gro_list; skb; skb = next) {
3058 napi_gro_complete(skb);
3061 napi->gro_count = 0;
3062 napi->gro_list = NULL;
3065 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3067 struct sk_buff **pp = NULL;
3068 struct packet_type *ptype;
3069 __be16 type = skb->protocol;
3070 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3073 enum gro_result ret;
3075 if (!(skb->dev->features & NETIF_F_GRO))
3078 if (skb_is_gso(skb) || skb_has_frags(skb))
3082 list_for_each_entry_rcu(ptype, head, list) {
3083 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3086 skb_set_network_header(skb, skb_gro_offset(skb));
3087 mac_len = skb->network_header - skb->mac_header;
3088 skb->mac_len = mac_len;
3089 NAPI_GRO_CB(skb)->same_flow = 0;
3090 NAPI_GRO_CB(skb)->flush = 0;
3091 NAPI_GRO_CB(skb)->free = 0;
3093 pp = ptype->gro_receive(&napi->gro_list, skb);
3098 if (&ptype->list == head)
3101 same_flow = NAPI_GRO_CB(skb)->same_flow;
3102 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3105 struct sk_buff *nskb = *pp;
3109 napi_gro_complete(nskb);
3116 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3120 NAPI_GRO_CB(skb)->count = 1;
3121 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3122 skb->next = napi->gro_list;
3123 napi->gro_list = skb;
3127 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3128 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3130 BUG_ON(skb->end - skb->tail < grow);
3132 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3135 skb->data_len -= grow;
3137 skb_shinfo(skb)->frags[0].page_offset += grow;
3138 skb_shinfo(skb)->frags[0].size -= grow;
3140 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3141 put_page(skb_shinfo(skb)->frags[0].page);
3142 memmove(skb_shinfo(skb)->frags,
3143 skb_shinfo(skb)->frags + 1,
3144 --skb_shinfo(skb)->nr_frags);
3155 EXPORT_SYMBOL(dev_gro_receive);
3158 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3162 if (netpoll_rx_on(skb))
3165 for (p = napi->gro_list; p; p = p->next) {
3166 NAPI_GRO_CB(p)->same_flow =
3167 (p->dev == skb->dev) &&
3168 !compare_ether_header(skb_mac_header(p),
3169 skb_gro_mac_header(skb));
3170 NAPI_GRO_CB(p)->flush = 0;
3173 return dev_gro_receive(napi, skb);
3176 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3180 if (netif_receive_skb(skb))
3185 case GRO_MERGED_FREE:
3196 EXPORT_SYMBOL(napi_skb_finish);
3198 void skb_gro_reset_offset(struct sk_buff *skb)
3200 NAPI_GRO_CB(skb)->data_offset = 0;
3201 NAPI_GRO_CB(skb)->frag0 = NULL;
3202 NAPI_GRO_CB(skb)->frag0_len = 0;
3204 if (skb->mac_header == skb->tail &&
3205 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3206 NAPI_GRO_CB(skb)->frag0 =
3207 page_address(skb_shinfo(skb)->frags[0].page) +
3208 skb_shinfo(skb)->frags[0].page_offset;
3209 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3212 EXPORT_SYMBOL(skb_gro_reset_offset);
3214 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3216 skb_gro_reset_offset(skb);
3218 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3220 EXPORT_SYMBOL(napi_gro_receive);
3222 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3224 __skb_pull(skb, skb_headlen(skb));
3225 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3229 EXPORT_SYMBOL(napi_reuse_skb);
3231 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3233 struct sk_buff *skb = napi->skb;
3236 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3242 EXPORT_SYMBOL(napi_get_frags);
3244 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3250 skb->protocol = eth_type_trans(skb, skb->dev);
3252 if (ret == GRO_HELD)
3253 skb_gro_pull(skb, -ETH_HLEN);
3254 else if (netif_receive_skb(skb))
3259 case GRO_MERGED_FREE:
3260 napi_reuse_skb(napi, skb);
3269 EXPORT_SYMBOL(napi_frags_finish);
3271 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3273 struct sk_buff *skb = napi->skb;
3280 skb_reset_mac_header(skb);
3281 skb_gro_reset_offset(skb);
3283 off = skb_gro_offset(skb);
3284 hlen = off + sizeof(*eth);
3285 eth = skb_gro_header_fast(skb, off);
3286 if (skb_gro_header_hard(skb, hlen)) {
3287 eth = skb_gro_header_slow(skb, hlen, off);
3288 if (unlikely(!eth)) {
3289 napi_reuse_skb(napi, skb);
3295 skb_gro_pull(skb, sizeof(*eth));
3298 * This works because the only protocols we care about don't require
3299 * special handling. We'll fix it up properly at the end.
3301 skb->protocol = eth->h_proto;
3306 EXPORT_SYMBOL(napi_frags_skb);
3308 gro_result_t napi_gro_frags(struct napi_struct *napi)
3310 struct sk_buff *skb = napi_frags_skb(napi);
3315 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3317 EXPORT_SYMBOL(napi_gro_frags);
3320 * net_rps_action sends any pending IPI's for rps.
3321 * Note: called with local irq disabled, but exits with local irq enabled.
3323 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3326 struct softnet_data *remsd = sd->rps_ipi_list;
3329 sd->rps_ipi_list = NULL;
3333 /* Send pending IPI's to kick RPS processing on remote cpus. */
3335 struct softnet_data *next = remsd->rps_ipi_next;
3337 if (cpu_online(remsd->cpu))
3338 __smp_call_function_single(remsd->cpu,
3347 static int process_backlog(struct napi_struct *napi, int quota)
3350 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3353 /* Check if we have pending ipi, its better to send them now,
3354 * not waiting net_rx_action() end.
3356 if (sd->rps_ipi_list) {
3357 local_irq_disable();
3358 net_rps_action_and_irq_enable(sd);
3361 napi->weight = weight_p;
3362 local_irq_disable();
3363 while (work < quota) {
3364 struct sk_buff *skb;
3367 while ((skb = __skb_dequeue(&sd->process_queue))) {
3369 __netif_receive_skb(skb);
3370 local_irq_disable();
3371 input_queue_head_incr(sd);
3372 if (++work >= quota) {
3379 qlen = skb_queue_len(&sd->input_pkt_queue);
3381 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3382 &sd->process_queue);
3384 if (qlen < quota - work) {
3386 * Inline a custom version of __napi_complete().
3387 * only current cpu owns and manipulates this napi,
3388 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3389 * we can use a plain write instead of clear_bit(),
3390 * and we dont need an smp_mb() memory barrier.
3392 list_del(&napi->poll_list);
3395 quota = work + qlen;
3405 * __napi_schedule - schedule for receive
3406 * @n: entry to schedule
3408 * The entry's receive function will be scheduled to run
3410 void __napi_schedule(struct napi_struct *n)
3412 unsigned long flags;
3414 local_irq_save(flags);
3415 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3416 local_irq_restore(flags);
3418 EXPORT_SYMBOL(__napi_schedule);
3420 void __napi_complete(struct napi_struct *n)
3422 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3423 BUG_ON(n->gro_list);
3425 list_del(&n->poll_list);
3426 smp_mb__before_clear_bit();
3427 clear_bit(NAPI_STATE_SCHED, &n->state);
3429 EXPORT_SYMBOL(__napi_complete);
3431 void napi_complete(struct napi_struct *n)
3433 unsigned long flags;
3436 * don't let napi dequeue from the cpu poll list
3437 * just in case its running on a different cpu
3439 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3443 local_irq_save(flags);
3445 local_irq_restore(flags);
3447 EXPORT_SYMBOL(napi_complete);
3449 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3450 int (*poll)(struct napi_struct *, int), int weight)
3452 INIT_LIST_HEAD(&napi->poll_list);
3453 napi->gro_count = 0;
3454 napi->gro_list = NULL;
3457 napi->weight = weight;
3458 list_add(&napi->dev_list, &dev->napi_list);
3460 #ifdef CONFIG_NETPOLL
3461 spin_lock_init(&napi->poll_lock);
3462 napi->poll_owner = -1;
3464 set_bit(NAPI_STATE_SCHED, &napi->state);
3466 EXPORT_SYMBOL(netif_napi_add);
3468 void netif_napi_del(struct napi_struct *napi)
3470 struct sk_buff *skb, *next;
3472 list_del_init(&napi->dev_list);
3473 napi_free_frags(napi);
3475 for (skb = napi->gro_list; skb; skb = next) {
3481 napi->gro_list = NULL;
3482 napi->gro_count = 0;
3484 EXPORT_SYMBOL(netif_napi_del);
3486 static void net_rx_action(struct softirq_action *h)
3488 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3489 unsigned long time_limit = jiffies + 2;
3490 int budget = netdev_budget;
3493 local_irq_disable();
3495 while (!list_empty(&sd->poll_list)) {
3496 struct napi_struct *n;
3499 /* If softirq window is exhuasted then punt.
3500 * Allow this to run for 2 jiffies since which will allow
3501 * an average latency of 1.5/HZ.
3503 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3508 /* Even though interrupts have been re-enabled, this
3509 * access is safe because interrupts can only add new
3510 * entries to the tail of this list, and only ->poll()
3511 * calls can remove this head entry from the list.
3513 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3515 have = netpoll_poll_lock(n);
3519 /* This NAPI_STATE_SCHED test is for avoiding a race
3520 * with netpoll's poll_napi(). Only the entity which
3521 * obtains the lock and sees NAPI_STATE_SCHED set will
3522 * actually make the ->poll() call. Therefore we avoid
3523 * accidently calling ->poll() when NAPI is not scheduled.
3526 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3527 work = n->poll(n, weight);
3531 WARN_ON_ONCE(work > weight);
3535 local_irq_disable();
3537 /* Drivers must not modify the NAPI state if they
3538 * consume the entire weight. In such cases this code
3539 * still "owns" the NAPI instance and therefore can
3540 * move the instance around on the list at-will.
3542 if (unlikely(work == weight)) {
3543 if (unlikely(napi_disable_pending(n))) {
3546 local_irq_disable();
3548 list_move_tail(&n->poll_list, &sd->poll_list);
3551 netpoll_poll_unlock(have);
3554 net_rps_action_and_irq_enable(sd);
3556 #ifdef CONFIG_NET_DMA
3558 * There may not be any more sk_buffs coming right now, so push
3559 * any pending DMA copies to hardware
3561 dma_issue_pending_all();
3568 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3572 static gifconf_func_t *gifconf_list[NPROTO];
3575 * register_gifconf - register a SIOCGIF handler
3576 * @family: Address family
3577 * @gifconf: Function handler
3579 * Register protocol dependent address dumping routines. The handler
3580 * that is passed must not be freed or reused until it has been replaced
3581 * by another handler.
3583 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3585 if (family >= NPROTO)
3587 gifconf_list[family] = gifconf;
3590 EXPORT_SYMBOL(register_gifconf);
3594 * Map an interface index to its name (SIOCGIFNAME)
3598 * We need this ioctl for efficient implementation of the
3599 * if_indextoname() function required by the IPv6 API. Without
3600 * it, we would have to search all the interfaces to find a
3604 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3606 struct net_device *dev;
3610 * Fetch the caller's info block.
3613 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3617 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3623 strcpy(ifr.ifr_name, dev->name);
3626 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3632 * Perform a SIOCGIFCONF call. This structure will change
3633 * size eventually, and there is nothing I can do about it.
3634 * Thus we will need a 'compatibility mode'.
3637 static int dev_ifconf(struct net *net, char __user *arg)
3640 struct net_device *dev;
3647 * Fetch the caller's info block.
3650 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3657 * Loop over the interfaces, and write an info block for each.
3661 for_each_netdev(net, dev) {
3662 for (i = 0; i < NPROTO; i++) {
3663 if (gifconf_list[i]) {
3666 done = gifconf_list[i](dev, NULL, 0);
3668 done = gifconf_list[i](dev, pos + total,
3678 * All done. Write the updated control block back to the caller.
3680 ifc.ifc_len = total;
3683 * Both BSD and Solaris return 0 here, so we do too.
3685 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3688 #ifdef CONFIG_PROC_FS
3690 * This is invoked by the /proc filesystem handler to display a device
3693 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3696 struct net *net = seq_file_net(seq);
3698 struct net_device *dev;
3702 return SEQ_START_TOKEN;
3705 for_each_netdev_rcu(net, dev)
3712 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3714 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3715 first_net_device(seq_file_net(seq)) :
3716 next_net_device((struct net_device *)v);
3719 return rcu_dereference(dev);
3722 void dev_seq_stop(struct seq_file *seq, void *v)
3728 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3730 struct rtnl_link_stats64 temp;
3731 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
3733 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
3734 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
3735 dev->name, stats->rx_bytes, stats->rx_packets,
3737 stats->rx_dropped + stats->rx_missed_errors,
3738 stats->rx_fifo_errors,
3739 stats->rx_length_errors + stats->rx_over_errors +
3740 stats->rx_crc_errors + stats->rx_frame_errors,
3741 stats->rx_compressed, stats->multicast,
3742 stats->tx_bytes, stats->tx_packets,
3743 stats->tx_errors, stats->tx_dropped,
3744 stats->tx_fifo_errors, stats->collisions,
3745 stats->tx_carrier_errors +
3746 stats->tx_aborted_errors +
3747 stats->tx_window_errors +
3748 stats->tx_heartbeat_errors,
3749 stats->tx_compressed);
3753 * Called from the PROCfs module. This now uses the new arbitrary sized
3754 * /proc/net interface to create /proc/net/dev
3756 static int dev_seq_show(struct seq_file *seq, void *v)
3758 if (v == SEQ_START_TOKEN)
3759 seq_puts(seq, "Inter-| Receive "
3761 " face |bytes packets errs drop fifo frame "
3762 "compressed multicast|bytes packets errs "
3763 "drop fifo colls carrier compressed\n");
3765 dev_seq_printf_stats(seq, v);
3769 static struct softnet_data *softnet_get_online(loff_t *pos)
3771 struct softnet_data *sd = NULL;
3773 while (*pos < nr_cpu_ids)
3774 if (cpu_online(*pos)) {
3775 sd = &per_cpu(softnet_data, *pos);
3782 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3784 return softnet_get_online(pos);
3787 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3790 return softnet_get_online(pos);
3793 static void softnet_seq_stop(struct seq_file *seq, void *v)
3797 static int softnet_seq_show(struct seq_file *seq, void *v)
3799 struct softnet_data *sd = v;
3801 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3802 sd->processed, sd->dropped, sd->time_squeeze, 0,
3803 0, 0, 0, 0, /* was fastroute */
3804 sd->cpu_collision, sd->received_rps);
3808 static const struct seq_operations dev_seq_ops = {
3809 .start = dev_seq_start,
3810 .next = dev_seq_next,
3811 .stop = dev_seq_stop,
3812 .show = dev_seq_show,
3815 static int dev_seq_open(struct inode *inode, struct file *file)
3817 return seq_open_net(inode, file, &dev_seq_ops,
3818 sizeof(struct seq_net_private));
3821 static const struct file_operations dev_seq_fops = {
3822 .owner = THIS_MODULE,
3823 .open = dev_seq_open,
3825 .llseek = seq_lseek,
3826 .release = seq_release_net,
3829 static const struct seq_operations softnet_seq_ops = {
3830 .start = softnet_seq_start,
3831 .next = softnet_seq_next,
3832 .stop = softnet_seq_stop,
3833 .show = softnet_seq_show,
3836 static int softnet_seq_open(struct inode *inode, struct file *file)
3838 return seq_open(file, &softnet_seq_ops);
3841 static const struct file_operations softnet_seq_fops = {
3842 .owner = THIS_MODULE,
3843 .open = softnet_seq_open,
3845 .llseek = seq_lseek,
3846 .release = seq_release,
3849 static void *ptype_get_idx(loff_t pos)
3851 struct packet_type *pt = NULL;
3855 list_for_each_entry_rcu(pt, &ptype_all, list) {
3861 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3862 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3871 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3875 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3878 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3880 struct packet_type *pt;
3881 struct list_head *nxt;
3885 if (v == SEQ_START_TOKEN)
3886 return ptype_get_idx(0);
3889 nxt = pt->list.next;
3890 if (pt->type == htons(ETH_P_ALL)) {
3891 if (nxt != &ptype_all)
3894 nxt = ptype_base[0].next;
3896 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3898 while (nxt == &ptype_base[hash]) {
3899 if (++hash >= PTYPE_HASH_SIZE)
3901 nxt = ptype_base[hash].next;
3904 return list_entry(nxt, struct packet_type, list);
3907 static void ptype_seq_stop(struct seq_file *seq, void *v)
3913 static int ptype_seq_show(struct seq_file *seq, void *v)
3915 struct packet_type *pt = v;
3917 if (v == SEQ_START_TOKEN)
3918 seq_puts(seq, "Type Device Function\n");
3919 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3920 if (pt->type == htons(ETH_P_ALL))
3921 seq_puts(seq, "ALL ");
3923 seq_printf(seq, "%04x", ntohs(pt->type));
3925 seq_printf(seq, " %-8s %pF\n",
3926 pt->dev ? pt->dev->name : "", pt->func);
3932 static const struct seq_operations ptype_seq_ops = {
3933 .start = ptype_seq_start,
3934 .next = ptype_seq_next,
3935 .stop = ptype_seq_stop,
3936 .show = ptype_seq_show,
3939 static int ptype_seq_open(struct inode *inode, struct file *file)
3941 return seq_open_net(inode, file, &ptype_seq_ops,
3942 sizeof(struct seq_net_private));
3945 static const struct file_operations ptype_seq_fops = {
3946 .owner = THIS_MODULE,
3947 .open = ptype_seq_open,
3949 .llseek = seq_lseek,
3950 .release = seq_release_net,
3954 static int __net_init dev_proc_net_init(struct net *net)
3958 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3960 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3962 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3965 if (wext_proc_init(net))
3971 proc_net_remove(net, "ptype");
3973 proc_net_remove(net, "softnet_stat");
3975 proc_net_remove(net, "dev");
3979 static void __net_exit dev_proc_net_exit(struct net *net)
3981 wext_proc_exit(net);
3983 proc_net_remove(net, "ptype");
3984 proc_net_remove(net, "softnet_stat");
3985 proc_net_remove(net, "dev");
3988 static struct pernet_operations __net_initdata dev_proc_ops = {
3989 .init = dev_proc_net_init,
3990 .exit = dev_proc_net_exit,
3993 static int __init dev_proc_init(void)
3995 return register_pernet_subsys(&dev_proc_ops);
3998 #define dev_proc_init() 0
3999 #endif /* CONFIG_PROC_FS */
4003 * netdev_set_master - set up master/slave pair
4004 * @slave: slave device
4005 * @master: new master device
4007 * Changes the master device of the slave. Pass %NULL to break the
4008 * bonding. The caller must hold the RTNL semaphore. On a failure
4009 * a negative errno code is returned. On success the reference counts
4010 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
4011 * function returns zero.
4013 int netdev_set_master(struct net_device *slave, struct net_device *master)
4015 struct net_device *old = slave->master;
4025 slave->master = master;
4032 slave->flags |= IFF_SLAVE;
4034 slave->flags &= ~IFF_SLAVE;
4036 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4039 EXPORT_SYMBOL(netdev_set_master);
4041 static void dev_change_rx_flags(struct net_device *dev, int flags)
4043 const struct net_device_ops *ops = dev->netdev_ops;
4045 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4046 ops->ndo_change_rx_flags(dev, flags);
4049 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4051 unsigned short old_flags = dev->flags;
4057 dev->flags |= IFF_PROMISC;
4058 dev->promiscuity += inc;
4059 if (dev->promiscuity == 0) {
4062 * If inc causes overflow, untouch promisc and return error.
4065 dev->flags &= ~IFF_PROMISC;
4067 dev->promiscuity -= inc;
4068 printk(KERN_WARNING "%s: promiscuity touches roof, "
4069 "set promiscuity failed, promiscuity feature "
4070 "of device might be broken.\n", dev->name);
4074 if (dev->flags != old_flags) {
4075 printk(KERN_INFO "device %s %s promiscuous mode\n",
4076 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4078 if (audit_enabled) {
4079 current_uid_gid(&uid, &gid);
4080 audit_log(current->audit_context, GFP_ATOMIC,
4081 AUDIT_ANOM_PROMISCUOUS,
4082 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4083 dev->name, (dev->flags & IFF_PROMISC),
4084 (old_flags & IFF_PROMISC),
4085 audit_get_loginuid(current),
4087 audit_get_sessionid(current));
4090 dev_change_rx_flags(dev, IFF_PROMISC);
4096 * dev_set_promiscuity - update promiscuity count on a device
4100 * Add or remove promiscuity from a device. While the count in the device
4101 * remains above zero the interface remains promiscuous. Once it hits zero
4102 * the device reverts back to normal filtering operation. A negative inc
4103 * value is used to drop promiscuity on the device.
4104 * Return 0 if successful or a negative errno code on error.
4106 int dev_set_promiscuity(struct net_device *dev, int inc)
4108 unsigned short old_flags = dev->flags;
4111 err = __dev_set_promiscuity(dev, inc);
4114 if (dev->flags != old_flags)
4115 dev_set_rx_mode(dev);
4118 EXPORT_SYMBOL(dev_set_promiscuity);
4121 * dev_set_allmulti - update allmulti count on a device
4125 * Add or remove reception of all multicast frames to a device. While the
4126 * count in the device remains above zero the interface remains listening
4127 * to all interfaces. Once it hits zero the device reverts back to normal
4128 * filtering operation. A negative @inc value is used to drop the counter
4129 * when releasing a resource needing all multicasts.
4130 * Return 0 if successful or a negative errno code on error.
4133 int dev_set_allmulti(struct net_device *dev, int inc)
4135 unsigned short old_flags = dev->flags;
4139 dev->flags |= IFF_ALLMULTI;
4140 dev->allmulti += inc;
4141 if (dev->allmulti == 0) {
4144 * If inc causes overflow, untouch allmulti and return error.
4147 dev->flags &= ~IFF_ALLMULTI;
4149 dev->allmulti -= inc;
4150 printk(KERN_WARNING "%s: allmulti touches roof, "
4151 "set allmulti failed, allmulti feature of "
4152 "device might be broken.\n", dev->name);
4156 if (dev->flags ^ old_flags) {
4157 dev_change_rx_flags(dev, IFF_ALLMULTI);
4158 dev_set_rx_mode(dev);
4162 EXPORT_SYMBOL(dev_set_allmulti);
4165 * Upload unicast and multicast address lists to device and
4166 * configure RX filtering. When the device doesn't support unicast
4167 * filtering it is put in promiscuous mode while unicast addresses
4170 void __dev_set_rx_mode(struct net_device *dev)
4172 const struct net_device_ops *ops = dev->netdev_ops;
4174 /* dev_open will call this function so the list will stay sane. */
4175 if (!(dev->flags&IFF_UP))
4178 if (!netif_device_present(dev))
4181 if (ops->ndo_set_rx_mode)
4182 ops->ndo_set_rx_mode(dev);
4184 /* Unicast addresses changes may only happen under the rtnl,
4185 * therefore calling __dev_set_promiscuity here is safe.
4187 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4188 __dev_set_promiscuity(dev, 1);
4189 dev->uc_promisc = 1;
4190 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4191 __dev_set_promiscuity(dev, -1);
4192 dev->uc_promisc = 0;
4195 if (ops->ndo_set_multicast_list)
4196 ops->ndo_set_multicast_list(dev);
4200 void dev_set_rx_mode(struct net_device *dev)
4202 netif_addr_lock_bh(dev);
4203 __dev_set_rx_mode(dev);
4204 netif_addr_unlock_bh(dev);
4208 * dev_get_flags - get flags reported to userspace
4211 * Get the combination of flag bits exported through APIs to userspace.
4213 unsigned dev_get_flags(const struct net_device *dev)
4217 flags = (dev->flags & ~(IFF_PROMISC |
4222 (dev->gflags & (IFF_PROMISC |
4225 if (netif_running(dev)) {
4226 if (netif_oper_up(dev))
4227 flags |= IFF_RUNNING;
4228 if (netif_carrier_ok(dev))
4229 flags |= IFF_LOWER_UP;
4230 if (netif_dormant(dev))
4231 flags |= IFF_DORMANT;
4236 EXPORT_SYMBOL(dev_get_flags);
4238 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4240 int old_flags = dev->flags;
4246 * Set the flags on our device.
4249 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4250 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4252 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4256 * Load in the correct multicast list now the flags have changed.
4259 if ((old_flags ^ flags) & IFF_MULTICAST)
4260 dev_change_rx_flags(dev, IFF_MULTICAST);
4262 dev_set_rx_mode(dev);
4265 * Have we downed the interface. We handle IFF_UP ourselves
4266 * according to user attempts to set it, rather than blindly
4271 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4272 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4275 dev_set_rx_mode(dev);
4278 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4279 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4281 dev->gflags ^= IFF_PROMISC;
4282 dev_set_promiscuity(dev, inc);
4285 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4286 is important. Some (broken) drivers set IFF_PROMISC, when
4287 IFF_ALLMULTI is requested not asking us and not reporting.
4289 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4290 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4292 dev->gflags ^= IFF_ALLMULTI;
4293 dev_set_allmulti(dev, inc);
4299 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4301 unsigned int changes = dev->flags ^ old_flags;
4303 if (changes & IFF_UP) {
4304 if (dev->flags & IFF_UP)
4305 call_netdevice_notifiers(NETDEV_UP, dev);
4307 call_netdevice_notifiers(NETDEV_DOWN, dev);
4310 if (dev->flags & IFF_UP &&
4311 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4312 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4316 * dev_change_flags - change device settings
4318 * @flags: device state flags
4320 * Change settings on device based state flags. The flags are
4321 * in the userspace exported format.
4323 int dev_change_flags(struct net_device *dev, unsigned flags)
4326 int old_flags = dev->flags;
4328 ret = __dev_change_flags(dev, flags);
4332 changes = old_flags ^ dev->flags;
4334 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4336 __dev_notify_flags(dev, old_flags);
4339 EXPORT_SYMBOL(dev_change_flags);
4342 * dev_set_mtu - Change maximum transfer unit
4344 * @new_mtu: new transfer unit
4346 * Change the maximum transfer size of the network device.
4348 int dev_set_mtu(struct net_device *dev, int new_mtu)
4350 const struct net_device_ops *ops = dev->netdev_ops;
4353 if (new_mtu == dev->mtu)
4356 /* MTU must be positive. */
4360 if (!netif_device_present(dev))
4364 if (ops->ndo_change_mtu)
4365 err = ops->ndo_change_mtu(dev, new_mtu);
4369 if (!err && dev->flags & IFF_UP)
4370 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4373 EXPORT_SYMBOL(dev_set_mtu);
4376 * dev_set_mac_address - Change Media Access Control Address
4380 * Change the hardware (MAC) address of the device
4382 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4384 const struct net_device_ops *ops = dev->netdev_ops;
4387 if (!ops->ndo_set_mac_address)
4389 if (sa->sa_family != dev->type)
4391 if (!netif_device_present(dev))
4393 err = ops->ndo_set_mac_address(dev, sa);
4395 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4398 EXPORT_SYMBOL(dev_set_mac_address);
4401 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4403 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4406 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4412 case SIOCGIFFLAGS: /* Get interface flags */
4413 ifr->ifr_flags = (short) dev_get_flags(dev);
4416 case SIOCGIFMETRIC: /* Get the metric on the interface
4417 (currently unused) */
4418 ifr->ifr_metric = 0;
4421 case SIOCGIFMTU: /* Get the MTU of a device */
4422 ifr->ifr_mtu = dev->mtu;
4427 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4429 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4430 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4431 ifr->ifr_hwaddr.sa_family = dev->type;
4439 ifr->ifr_map.mem_start = dev->mem_start;
4440 ifr->ifr_map.mem_end = dev->mem_end;
4441 ifr->ifr_map.base_addr = dev->base_addr;
4442 ifr->ifr_map.irq = dev->irq;
4443 ifr->ifr_map.dma = dev->dma;
4444 ifr->ifr_map.port = dev->if_port;
4448 ifr->ifr_ifindex = dev->ifindex;
4452 ifr->ifr_qlen = dev->tx_queue_len;
4456 /* dev_ioctl() should ensure this case
4468 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4470 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4473 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4474 const struct net_device_ops *ops;
4479 ops = dev->netdev_ops;
4482 case SIOCSIFFLAGS: /* Set interface flags */
4483 return dev_change_flags(dev, ifr->ifr_flags);
4485 case SIOCSIFMETRIC: /* Set the metric on the interface
4486 (currently unused) */
4489 case SIOCSIFMTU: /* Set the MTU of a device */
4490 return dev_set_mtu(dev, ifr->ifr_mtu);
4493 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4495 case SIOCSIFHWBROADCAST:
4496 if (ifr->ifr_hwaddr.sa_family != dev->type)
4498 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4499 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4500 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4504 if (ops->ndo_set_config) {
4505 if (!netif_device_present(dev))
4507 return ops->ndo_set_config(dev, &ifr->ifr_map);
4512 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4513 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4515 if (!netif_device_present(dev))
4517 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4520 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4521 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4523 if (!netif_device_present(dev))
4525 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4528 if (ifr->ifr_qlen < 0)
4530 dev->tx_queue_len = ifr->ifr_qlen;
4534 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4535 return dev_change_name(dev, ifr->ifr_newname);
4538 * Unknown or private ioctl
4541 if ((cmd >= SIOCDEVPRIVATE &&
4542 cmd <= SIOCDEVPRIVATE + 15) ||
4543 cmd == SIOCBONDENSLAVE ||
4544 cmd == SIOCBONDRELEASE ||
4545 cmd == SIOCBONDSETHWADDR ||
4546 cmd == SIOCBONDSLAVEINFOQUERY ||
4547 cmd == SIOCBONDINFOQUERY ||
4548 cmd == SIOCBONDCHANGEACTIVE ||
4549 cmd == SIOCGMIIPHY ||
4550 cmd == SIOCGMIIREG ||
4551 cmd == SIOCSMIIREG ||
4552 cmd == SIOCBRADDIF ||
4553 cmd == SIOCBRDELIF ||
4554 cmd == SIOCSHWTSTAMP ||
4555 cmd == SIOCWANDEV) {
4557 if (ops->ndo_do_ioctl) {
4558 if (netif_device_present(dev))
4559 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4571 * This function handles all "interface"-type I/O control requests. The actual
4572 * 'doing' part of this is dev_ifsioc above.
4576 * dev_ioctl - network device ioctl
4577 * @net: the applicable net namespace
4578 * @cmd: command to issue
4579 * @arg: pointer to a struct ifreq in user space
4581 * Issue ioctl functions to devices. This is normally called by the
4582 * user space syscall interfaces but can sometimes be useful for
4583 * other purposes. The return value is the return from the syscall if
4584 * positive or a negative errno code on error.
4587 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4593 /* One special case: SIOCGIFCONF takes ifconf argument
4594 and requires shared lock, because it sleeps writing
4598 if (cmd == SIOCGIFCONF) {
4600 ret = dev_ifconf(net, (char __user *) arg);
4604 if (cmd == SIOCGIFNAME)
4605 return dev_ifname(net, (struct ifreq __user *)arg);
4607 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4610 ifr.ifr_name[IFNAMSIZ-1] = 0;
4612 colon = strchr(ifr.ifr_name, ':');
4617 * See which interface the caller is talking about.
4622 * These ioctl calls:
4623 * - can be done by all.
4624 * - atomic and do not require locking.
4635 dev_load(net, ifr.ifr_name);
4637 ret = dev_ifsioc_locked(net, &ifr, cmd);
4642 if (copy_to_user(arg, &ifr,
4643 sizeof(struct ifreq)))
4649 dev_load(net, ifr.ifr_name);
4651 ret = dev_ethtool(net, &ifr);
4656 if (copy_to_user(arg, &ifr,
4657 sizeof(struct ifreq)))
4663 * These ioctl calls:
4664 * - require superuser power.
4665 * - require strict serialization.
4671 if (!capable(CAP_NET_ADMIN))
4673 dev_load(net, ifr.ifr_name);
4675 ret = dev_ifsioc(net, &ifr, cmd);
4680 if (copy_to_user(arg, &ifr,
4681 sizeof(struct ifreq)))
4687 * These ioctl calls:
4688 * - require superuser power.
4689 * - require strict serialization.
4690 * - do not return a value
4700 case SIOCSIFHWBROADCAST:
4703 case SIOCBONDENSLAVE:
4704 case SIOCBONDRELEASE:
4705 case SIOCBONDSETHWADDR:
4706 case SIOCBONDCHANGEACTIVE:
4710 if (!capable(CAP_NET_ADMIN))
4713 case SIOCBONDSLAVEINFOQUERY:
4714 case SIOCBONDINFOQUERY:
4715 dev_load(net, ifr.ifr_name);
4717 ret = dev_ifsioc(net, &ifr, cmd);
4722 /* Get the per device memory space. We can add this but
4723 * currently do not support it */
4725 /* Set the per device memory buffer space.
4726 * Not applicable in our case */
4731 * Unknown or private ioctl.
4734 if (cmd == SIOCWANDEV ||
4735 (cmd >= SIOCDEVPRIVATE &&
4736 cmd <= SIOCDEVPRIVATE + 15)) {
4737 dev_load(net, ifr.ifr_name);
4739 ret = dev_ifsioc(net, &ifr, cmd);
4741 if (!ret && copy_to_user(arg, &ifr,
4742 sizeof(struct ifreq)))
4746 /* Take care of Wireless Extensions */
4747 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4748 return wext_handle_ioctl(net, &ifr, cmd, arg);
4755 * dev_new_index - allocate an ifindex
4756 * @net: the applicable net namespace
4758 * Returns a suitable unique value for a new device interface
4759 * number. The caller must hold the rtnl semaphore or the
4760 * dev_base_lock to be sure it remains unique.
4762 static int dev_new_index(struct net *net)
4768 if (!__dev_get_by_index(net, ifindex))
4773 /* Delayed registration/unregisteration */
4774 static LIST_HEAD(net_todo_list);
4776 static void net_set_todo(struct net_device *dev)
4778 list_add_tail(&dev->todo_list, &net_todo_list);
4781 static void rollback_registered_many(struct list_head *head)
4783 struct net_device *dev, *tmp;
4785 BUG_ON(dev_boot_phase);
4788 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4789 /* Some devices call without registering
4790 * for initialization unwind. Remove those
4791 * devices and proceed with the remaining.
4793 if (dev->reg_state == NETREG_UNINITIALIZED) {
4794 pr_debug("unregister_netdevice: device %s/%p never "
4795 "was registered\n", dev->name, dev);
4798 list_del(&dev->unreg_list);
4802 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4804 /* If device is running, close it first. */
4807 /* And unlink it from device chain. */
4808 unlist_netdevice(dev);
4810 dev->reg_state = NETREG_UNREGISTERING;
4815 list_for_each_entry(dev, head, unreg_list) {
4816 /* Shutdown queueing discipline. */
4820 /* Notify protocols, that we are about to destroy
4821 this device. They should clean all the things.
4823 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4825 if (!dev->rtnl_link_ops ||
4826 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4827 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4830 * Flush the unicast and multicast chains
4835 if (dev->netdev_ops->ndo_uninit)
4836 dev->netdev_ops->ndo_uninit(dev);
4838 /* Notifier chain MUST detach us from master device. */
4839 WARN_ON(dev->master);
4841 /* Remove entries from kobject tree */
4842 netdev_unregister_kobject(dev);
4845 /* Process any work delayed until the end of the batch */
4846 dev = list_first_entry(head, struct net_device, unreg_list);
4847 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4851 list_for_each_entry(dev, head, unreg_list)
4855 static void rollback_registered(struct net_device *dev)
4859 list_add(&dev->unreg_list, &single);
4860 rollback_registered_many(&single);
4863 static void __netdev_init_queue_locks_one(struct net_device *dev,
4864 struct netdev_queue *dev_queue,
4867 spin_lock_init(&dev_queue->_xmit_lock);
4868 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4869 dev_queue->xmit_lock_owner = -1;
4872 static void netdev_init_queue_locks(struct net_device *dev)
4874 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4875 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4878 unsigned long netdev_fix_features(unsigned long features, const char *name)
4880 /* Fix illegal SG+CSUM combinations. */
4881 if ((features & NETIF_F_SG) &&
4882 !(features & NETIF_F_ALL_CSUM)) {
4884 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4885 "checksum feature.\n", name);
4886 features &= ~NETIF_F_SG;
4889 /* TSO requires that SG is present as well. */
4890 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4892 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4893 "SG feature.\n", name);
4894 features &= ~NETIF_F_TSO;
4897 if (features & NETIF_F_UFO) {
4898 if (!(features & NETIF_F_GEN_CSUM)) {
4900 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4901 "since no NETIF_F_HW_CSUM feature.\n",
4903 features &= ~NETIF_F_UFO;
4906 if (!(features & NETIF_F_SG)) {
4908 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4909 "since no NETIF_F_SG feature.\n", name);
4910 features &= ~NETIF_F_UFO;
4916 EXPORT_SYMBOL(netdev_fix_features);
4919 * netif_stacked_transfer_operstate - transfer operstate
4920 * @rootdev: the root or lower level device to transfer state from
4921 * @dev: the device to transfer operstate to
4923 * Transfer operational state from root to device. This is normally
4924 * called when a stacking relationship exists between the root
4925 * device and the device(a leaf device).
4927 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4928 struct net_device *dev)
4930 if (rootdev->operstate == IF_OPER_DORMANT)
4931 netif_dormant_on(dev);
4933 netif_dormant_off(dev);
4935 if (netif_carrier_ok(rootdev)) {
4936 if (!netif_carrier_ok(dev))
4937 netif_carrier_on(dev);
4939 if (netif_carrier_ok(dev))
4940 netif_carrier_off(dev);
4943 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4946 * register_netdevice - register a network device
4947 * @dev: device to register
4949 * Take a completed network device structure and add it to the kernel
4950 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4951 * chain. 0 is returned on success. A negative errno code is returned
4952 * on a failure to set up the device, or if the name is a duplicate.
4954 * Callers must hold the rtnl semaphore. You may want
4955 * register_netdev() instead of this.
4958 * The locking appears insufficient to guarantee two parallel registers
4959 * will not get the same name.
4962 int register_netdevice(struct net_device *dev)
4965 struct net *net = dev_net(dev);
4967 BUG_ON(dev_boot_phase);
4972 /* When net_device's are persistent, this will be fatal. */
4973 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4976 spin_lock_init(&dev->addr_list_lock);
4977 netdev_set_addr_lockdep_class(dev);
4978 netdev_init_queue_locks(dev);
4983 if (!dev->num_rx_queues) {
4985 * Allocate a single RX queue if driver never called
4989 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
4995 dev->_rx->first = dev->_rx;
4996 atomic_set(&dev->_rx->count, 1);
4997 dev->num_rx_queues = 1;
5000 /* Init, if this function is available */
5001 if (dev->netdev_ops->ndo_init) {
5002 ret = dev->netdev_ops->ndo_init(dev);
5010 ret = dev_get_valid_name(dev, dev->name, 0);
5014 dev->ifindex = dev_new_index(net);
5015 if (dev->iflink == -1)
5016 dev->iflink = dev->ifindex;
5018 /* Fix illegal checksum combinations */
5019 if ((dev->features & NETIF_F_HW_CSUM) &&
5020 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5021 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
5023 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5026 if ((dev->features & NETIF_F_NO_CSUM) &&
5027 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5028 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
5030 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5033 dev->features = netdev_fix_features(dev->features, dev->name);
5035 /* Enable software GSO if SG is supported. */
5036 if (dev->features & NETIF_F_SG)
5037 dev->features |= NETIF_F_GSO;
5039 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5040 ret = notifier_to_errno(ret);
5044 ret = netdev_register_kobject(dev);
5047 dev->reg_state = NETREG_REGISTERED;
5050 * Default initial state at registry is that the
5051 * device is present.
5054 set_bit(__LINK_STATE_PRESENT, &dev->state);
5056 dev_init_scheduler(dev);
5058 list_netdevice(dev);
5060 /* Notify protocols, that a new device appeared. */
5061 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5062 ret = notifier_to_errno(ret);
5064 rollback_registered(dev);
5065 dev->reg_state = NETREG_UNREGISTERED;
5068 * Prevent userspace races by waiting until the network
5069 * device is fully setup before sending notifications.
5071 if (!dev->rtnl_link_ops ||
5072 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5073 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5079 if (dev->netdev_ops->ndo_uninit)
5080 dev->netdev_ops->ndo_uninit(dev);
5083 EXPORT_SYMBOL(register_netdevice);
5086 * init_dummy_netdev - init a dummy network device for NAPI
5087 * @dev: device to init
5089 * This takes a network device structure and initialize the minimum
5090 * amount of fields so it can be used to schedule NAPI polls without
5091 * registering a full blown interface. This is to be used by drivers
5092 * that need to tie several hardware interfaces to a single NAPI
5093 * poll scheduler due to HW limitations.
5095 int init_dummy_netdev(struct net_device *dev)
5097 /* Clear everything. Note we don't initialize spinlocks
5098 * are they aren't supposed to be taken by any of the
5099 * NAPI code and this dummy netdev is supposed to be
5100 * only ever used for NAPI polls
5102 memset(dev, 0, sizeof(struct net_device));
5104 /* make sure we BUG if trying to hit standard
5105 * register/unregister code path
5107 dev->reg_state = NETREG_DUMMY;
5109 /* initialize the ref count */
5110 atomic_set(&dev->refcnt, 1);
5112 /* NAPI wants this */
5113 INIT_LIST_HEAD(&dev->napi_list);
5115 /* a dummy interface is started by default */
5116 set_bit(__LINK_STATE_PRESENT, &dev->state);
5117 set_bit(__LINK_STATE_START, &dev->state);
5121 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5125 * register_netdev - register a network device
5126 * @dev: device to register
5128 * Take a completed network device structure and add it to the kernel
5129 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5130 * chain. 0 is returned on success. A negative errno code is returned
5131 * on a failure to set up the device, or if the name is a duplicate.
5133 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5134 * and expands the device name if you passed a format string to
5137 int register_netdev(struct net_device *dev)
5144 * If the name is a format string the caller wants us to do a
5147 if (strchr(dev->name, '%')) {
5148 err = dev_alloc_name(dev, dev->name);
5153 err = register_netdevice(dev);
5158 EXPORT_SYMBOL(register_netdev);
5161 * netdev_wait_allrefs - wait until all references are gone.
5163 * This is called when unregistering network devices.
5165 * Any protocol or device that holds a reference should register
5166 * for netdevice notification, and cleanup and put back the
5167 * reference if they receive an UNREGISTER event.
5168 * We can get stuck here if buggy protocols don't correctly
5171 static void netdev_wait_allrefs(struct net_device *dev)
5173 unsigned long rebroadcast_time, warning_time;
5175 linkwatch_forget_dev(dev);
5177 rebroadcast_time = warning_time = jiffies;
5178 while (atomic_read(&dev->refcnt) != 0) {
5179 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5182 /* Rebroadcast unregister notification */
5183 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5184 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5185 * should have already handle it the first time */
5187 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5189 /* We must not have linkwatch events
5190 * pending on unregister. If this
5191 * happens, we simply run the queue
5192 * unscheduled, resulting in a noop
5195 linkwatch_run_queue();
5200 rebroadcast_time = jiffies;
5205 if (time_after(jiffies, warning_time + 10 * HZ)) {
5206 printk(KERN_EMERG "unregister_netdevice: "
5207 "waiting for %s to become free. Usage "
5209 dev->name, atomic_read(&dev->refcnt));
5210 warning_time = jiffies;
5219 * register_netdevice(x1);
5220 * register_netdevice(x2);
5222 * unregister_netdevice(y1);
5223 * unregister_netdevice(y2);
5229 * We are invoked by rtnl_unlock().
5230 * This allows us to deal with problems:
5231 * 1) We can delete sysfs objects which invoke hotplug
5232 * without deadlocking with linkwatch via keventd.
5233 * 2) Since we run with the RTNL semaphore not held, we can sleep
5234 * safely in order to wait for the netdev refcnt to drop to zero.
5236 * We must not return until all unregister events added during
5237 * the interval the lock was held have been completed.
5239 void netdev_run_todo(void)
5241 struct list_head list;
5243 /* Snapshot list, allow later requests */
5244 list_replace_init(&net_todo_list, &list);
5248 while (!list_empty(&list)) {
5249 struct net_device *dev
5250 = list_first_entry(&list, struct net_device, todo_list);
5251 list_del(&dev->todo_list);
5253 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5254 printk(KERN_ERR "network todo '%s' but state %d\n",
5255 dev->name, dev->reg_state);
5260 dev->reg_state = NETREG_UNREGISTERED;
5262 on_each_cpu(flush_backlog, dev, 1);
5264 netdev_wait_allrefs(dev);
5267 BUG_ON(atomic_read(&dev->refcnt));
5268 WARN_ON(dev->ip_ptr);
5269 WARN_ON(dev->ip6_ptr);
5270 WARN_ON(dev->dn_ptr);
5272 if (dev->destructor)
5273 dev->destructor(dev);
5275 /* Free network device */
5276 kobject_put(&dev->dev.kobj);
5281 * dev_txq_stats_fold - fold tx_queues stats
5282 * @dev: device to get statistics from
5283 * @stats: struct rtnl_link_stats64 to hold results
5285 void dev_txq_stats_fold(const struct net_device *dev,
5286 struct rtnl_link_stats64 *stats)
5288 u64 tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5290 struct netdev_queue *txq;
5292 for (i = 0; i < dev->num_tx_queues; i++) {
5293 txq = netdev_get_tx_queue(dev, i);
5294 spin_lock_bh(&txq->_xmit_lock);
5295 tx_bytes += txq->tx_bytes;
5296 tx_packets += txq->tx_packets;
5297 tx_dropped += txq->tx_dropped;
5298 spin_unlock_bh(&txq->_xmit_lock);
5300 if (tx_bytes || tx_packets || tx_dropped) {
5301 stats->tx_bytes = tx_bytes;
5302 stats->tx_packets = tx_packets;
5303 stats->tx_dropped = tx_dropped;
5306 EXPORT_SYMBOL(dev_txq_stats_fold);
5308 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5309 * fields in the same order, with only the type differing.
5311 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5312 const struct net_device_stats *netdev_stats)
5314 #if BITS_PER_LONG == 64
5315 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5316 memcpy(stats64, netdev_stats, sizeof(*stats64));
5318 size_t i, n = sizeof(*stats64) / sizeof(u64);
5319 const unsigned long *src = (const unsigned long *)netdev_stats;
5320 u64 *dst = (u64 *)stats64;
5322 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5323 sizeof(*stats64) / sizeof(u64));
5324 for (i = 0; i < n; i++)
5330 * dev_get_stats - get network device statistics
5331 * @dev: device to get statistics from
5332 * @storage: place to store stats
5334 * Get network statistics from device. Return @storage.
5335 * The device driver may provide its own method by setting
5336 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5337 * otherwise the internal statistics structure is used.
5339 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5340 struct rtnl_link_stats64 *storage)
5342 const struct net_device_ops *ops = dev->netdev_ops;
5344 if (ops->ndo_get_stats64) {
5345 memset(storage, 0, sizeof(*storage));
5346 return ops->ndo_get_stats64(dev, storage);
5348 if (ops->ndo_get_stats) {
5349 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5352 netdev_stats_to_stats64(storage, &dev->stats);
5353 dev_txq_stats_fold(dev, storage);
5356 EXPORT_SYMBOL(dev_get_stats);
5358 static void netdev_init_one_queue(struct net_device *dev,
5359 struct netdev_queue *queue,
5365 static void netdev_init_queues(struct net_device *dev)
5367 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5368 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5369 spin_lock_init(&dev->tx_global_lock);
5373 * alloc_netdev_mq - allocate network device
5374 * @sizeof_priv: size of private data to allocate space for
5375 * @name: device name format string
5376 * @setup: callback to initialize device
5377 * @queue_count: the number of subqueues to allocate
5379 * Allocates a struct net_device with private data area for driver use
5380 * and performs basic initialization. Also allocates subquue structs
5381 * for each queue on the device at the end of the netdevice.
5383 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5384 void (*setup)(struct net_device *), unsigned int queue_count)
5386 struct netdev_queue *tx;
5387 struct net_device *dev;
5389 struct net_device *p;
5391 struct netdev_rx_queue *rx;
5395 BUG_ON(strlen(name) >= sizeof(dev->name));
5397 alloc_size = sizeof(struct net_device);
5399 /* ensure 32-byte alignment of private area */
5400 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5401 alloc_size += sizeof_priv;
5403 /* ensure 32-byte alignment of whole construct */
5404 alloc_size += NETDEV_ALIGN - 1;
5406 p = kzalloc(alloc_size, GFP_KERNEL);
5408 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5412 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5414 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5420 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5422 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5427 atomic_set(&rx->count, queue_count);
5430 * Set a pointer to first element in the array which holds the
5433 for (i = 0; i < queue_count; i++)
5437 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5438 dev->padded = (char *)dev - (char *)p;
5440 if (dev_addr_init(dev))
5446 dev_net_set(dev, &init_net);
5449 dev->num_tx_queues = queue_count;
5450 dev->real_num_tx_queues = queue_count;
5454 dev->num_rx_queues = queue_count;
5457 dev->gso_max_size = GSO_MAX_SIZE;
5459 netdev_init_queues(dev);
5461 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5462 dev->ethtool_ntuple_list.count = 0;
5463 INIT_LIST_HEAD(&dev->napi_list);
5464 INIT_LIST_HEAD(&dev->unreg_list);
5465 INIT_LIST_HEAD(&dev->link_watch_list);
5466 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5468 strcpy(dev->name, name);
5481 EXPORT_SYMBOL(alloc_netdev_mq);
5484 * free_netdev - free network device
5487 * This function does the last stage of destroying an allocated device
5488 * interface. The reference to the device object is released.
5489 * If this is the last reference then it will be freed.
5491 void free_netdev(struct net_device *dev)
5493 struct napi_struct *p, *n;
5495 release_net(dev_net(dev));
5499 /* Flush device addresses */
5500 dev_addr_flush(dev);
5502 /* Clear ethtool n-tuple list */
5503 ethtool_ntuple_flush(dev);
5505 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5508 /* Compatibility with error handling in drivers */
5509 if (dev->reg_state == NETREG_UNINITIALIZED) {
5510 kfree((char *)dev - dev->padded);
5514 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5515 dev->reg_state = NETREG_RELEASED;
5517 /* will free via device release */
5518 put_device(&dev->dev);
5520 EXPORT_SYMBOL(free_netdev);
5523 * synchronize_net - Synchronize with packet receive processing
5525 * Wait for packets currently being received to be done.
5526 * Does not block later packets from starting.
5528 void synchronize_net(void)
5533 EXPORT_SYMBOL(synchronize_net);
5536 * unregister_netdevice_queue - remove device from the kernel
5540 * This function shuts down a device interface and removes it
5541 * from the kernel tables.
5542 * If head not NULL, device is queued to be unregistered later.
5544 * Callers must hold the rtnl semaphore. You may want
5545 * unregister_netdev() instead of this.
5548 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5553 list_move_tail(&dev->unreg_list, head);
5555 rollback_registered(dev);
5556 /* Finish processing unregister after unlock */
5560 EXPORT_SYMBOL(unregister_netdevice_queue);
5563 * unregister_netdevice_many - unregister many devices
5564 * @head: list of devices
5566 void unregister_netdevice_many(struct list_head *head)
5568 struct net_device *dev;
5570 if (!list_empty(head)) {
5571 rollback_registered_many(head);
5572 list_for_each_entry(dev, head, unreg_list)
5576 EXPORT_SYMBOL(unregister_netdevice_many);
5579 * unregister_netdev - remove device from the kernel
5582 * This function shuts down a device interface and removes it
5583 * from the kernel tables.
5585 * This is just a wrapper for unregister_netdevice that takes
5586 * the rtnl semaphore. In general you want to use this and not
5587 * unregister_netdevice.
5589 void unregister_netdev(struct net_device *dev)
5592 unregister_netdevice(dev);
5595 EXPORT_SYMBOL(unregister_netdev);
5598 * dev_change_net_namespace - move device to different nethost namespace
5600 * @net: network namespace
5601 * @pat: If not NULL name pattern to try if the current device name
5602 * is already taken in the destination network namespace.
5604 * This function shuts down a device interface and moves it
5605 * to a new network namespace. On success 0 is returned, on
5606 * a failure a netagive errno code is returned.
5608 * Callers must hold the rtnl semaphore.
5611 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5617 /* Don't allow namespace local devices to be moved. */
5619 if (dev->features & NETIF_F_NETNS_LOCAL)
5622 /* Ensure the device has been registrered */
5624 if (dev->reg_state != NETREG_REGISTERED)
5627 /* Get out if there is nothing todo */
5629 if (net_eq(dev_net(dev), net))
5632 /* Pick the destination device name, and ensure
5633 * we can use it in the destination network namespace.
5636 if (__dev_get_by_name(net, dev->name)) {
5637 /* We get here if we can't use the current device name */
5640 if (dev_get_valid_name(dev, pat, 1))
5645 * And now a mini version of register_netdevice unregister_netdevice.
5648 /* If device is running close it first. */
5651 /* And unlink it from device chain */
5653 unlist_netdevice(dev);
5657 /* Shutdown queueing discipline. */
5660 /* Notify protocols, that we are about to destroy
5661 this device. They should clean all the things.
5663 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5664 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5667 * Flush the unicast and multicast chains
5672 /* Actually switch the network namespace */
5673 dev_net_set(dev, net);
5675 /* If there is an ifindex conflict assign a new one */
5676 if (__dev_get_by_index(net, dev->ifindex)) {
5677 int iflink = (dev->iflink == dev->ifindex);
5678 dev->ifindex = dev_new_index(net);
5680 dev->iflink = dev->ifindex;
5683 /* Fixup kobjects */
5684 err = device_rename(&dev->dev, dev->name);
5687 /* Add the device back in the hashes */
5688 list_netdevice(dev);
5690 /* Notify protocols, that a new device appeared. */
5691 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5694 * Prevent userspace races by waiting until the network
5695 * device is fully setup before sending notifications.
5697 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5704 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5706 static int dev_cpu_callback(struct notifier_block *nfb,
5707 unsigned long action,
5710 struct sk_buff **list_skb;
5711 struct sk_buff *skb;
5712 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5713 struct softnet_data *sd, *oldsd;
5715 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5718 local_irq_disable();
5719 cpu = smp_processor_id();
5720 sd = &per_cpu(softnet_data, cpu);
5721 oldsd = &per_cpu(softnet_data, oldcpu);
5723 /* Find end of our completion_queue. */
5724 list_skb = &sd->completion_queue;
5726 list_skb = &(*list_skb)->next;
5727 /* Append completion queue from offline CPU. */
5728 *list_skb = oldsd->completion_queue;
5729 oldsd->completion_queue = NULL;
5731 /* Append output queue from offline CPU. */
5732 if (oldsd->output_queue) {
5733 *sd->output_queue_tailp = oldsd->output_queue;
5734 sd->output_queue_tailp = oldsd->output_queue_tailp;
5735 oldsd->output_queue = NULL;
5736 oldsd->output_queue_tailp = &oldsd->output_queue;
5739 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5742 /* Process offline CPU's input_pkt_queue */
5743 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
5745 input_queue_head_incr(oldsd);
5747 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5749 input_queue_head_incr(oldsd);
5757 * netdev_increment_features - increment feature set by one
5758 * @all: current feature set
5759 * @one: new feature set
5760 * @mask: mask feature set
5762 * Computes a new feature set after adding a device with feature set
5763 * @one to the master device with current feature set @all. Will not
5764 * enable anything that is off in @mask. Returns the new feature set.
5766 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5769 /* If device needs checksumming, downgrade to it. */
5770 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5771 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5772 else if (mask & NETIF_F_ALL_CSUM) {
5773 /* If one device supports v4/v6 checksumming, set for all. */
5774 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5775 !(all & NETIF_F_GEN_CSUM)) {
5776 all &= ~NETIF_F_ALL_CSUM;
5777 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5780 /* If one device supports hw checksumming, set for all. */
5781 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5782 all &= ~NETIF_F_ALL_CSUM;
5783 all |= NETIF_F_HW_CSUM;
5787 one |= NETIF_F_ALL_CSUM;
5789 one |= all & NETIF_F_ONE_FOR_ALL;
5790 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5791 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5795 EXPORT_SYMBOL(netdev_increment_features);
5797 static struct hlist_head *netdev_create_hash(void)
5800 struct hlist_head *hash;
5802 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5804 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5805 INIT_HLIST_HEAD(&hash[i]);
5810 /* Initialize per network namespace state */
5811 static int __net_init netdev_init(struct net *net)
5813 INIT_LIST_HEAD(&net->dev_base_head);
5815 net->dev_name_head = netdev_create_hash();
5816 if (net->dev_name_head == NULL)
5819 net->dev_index_head = netdev_create_hash();
5820 if (net->dev_index_head == NULL)
5826 kfree(net->dev_name_head);
5832 * netdev_drivername - network driver for the device
5833 * @dev: network device
5834 * @buffer: buffer for resulting name
5835 * @len: size of buffer
5837 * Determine network driver for device.
5839 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5841 const struct device_driver *driver;
5842 const struct device *parent;
5844 if (len <= 0 || !buffer)
5848 parent = dev->dev.parent;
5853 driver = parent->driver;
5854 if (driver && driver->name)
5855 strlcpy(buffer, driver->name, len);
5859 static int __netdev_printk(const char *level, const struct net_device *dev,
5860 struct va_format *vaf)
5864 if (dev && dev->dev.parent)
5865 r = dev_printk(level, dev->dev.parent, "%s: %pV",
5866 netdev_name(dev), vaf);
5868 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
5870 r = printk("%s(NULL net_device): %pV", level, vaf);
5875 int netdev_printk(const char *level, const struct net_device *dev,
5876 const char *format, ...)
5878 struct va_format vaf;
5882 va_start(args, format);
5887 r = __netdev_printk(level, dev, &vaf);
5892 EXPORT_SYMBOL(netdev_printk);
5894 #define define_netdev_printk_level(func, level) \
5895 int func(const struct net_device *dev, const char *fmt, ...) \
5898 struct va_format vaf; \
5901 va_start(args, fmt); \
5906 r = __netdev_printk(level, dev, &vaf); \
5911 EXPORT_SYMBOL(func);
5913 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
5914 define_netdev_printk_level(netdev_alert, KERN_ALERT);
5915 define_netdev_printk_level(netdev_crit, KERN_CRIT);
5916 define_netdev_printk_level(netdev_err, KERN_ERR);
5917 define_netdev_printk_level(netdev_warn, KERN_WARNING);
5918 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
5919 define_netdev_printk_level(netdev_info, KERN_INFO);
5921 static void __net_exit netdev_exit(struct net *net)
5923 kfree(net->dev_name_head);
5924 kfree(net->dev_index_head);
5927 static struct pernet_operations __net_initdata netdev_net_ops = {
5928 .init = netdev_init,
5929 .exit = netdev_exit,
5932 static void __net_exit default_device_exit(struct net *net)
5934 struct net_device *dev, *aux;
5936 * Push all migratable network devices back to the
5937 * initial network namespace
5940 for_each_netdev_safe(net, dev, aux) {
5942 char fb_name[IFNAMSIZ];
5944 /* Ignore unmoveable devices (i.e. loopback) */
5945 if (dev->features & NETIF_F_NETNS_LOCAL)
5948 /* Leave virtual devices for the generic cleanup */
5949 if (dev->rtnl_link_ops)
5952 /* Push remaing network devices to init_net */
5953 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5954 err = dev_change_net_namespace(dev, &init_net, fb_name);
5956 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5957 __func__, dev->name, err);
5964 static void __net_exit default_device_exit_batch(struct list_head *net_list)
5966 /* At exit all network devices most be removed from a network
5967 * namespace. Do this in the reverse order of registeration.
5968 * Do this across as many network namespaces as possible to
5969 * improve batching efficiency.
5971 struct net_device *dev;
5973 LIST_HEAD(dev_kill_list);
5976 list_for_each_entry(net, net_list, exit_list) {
5977 for_each_netdev_reverse(net, dev) {
5978 if (dev->rtnl_link_ops)
5979 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
5981 unregister_netdevice_queue(dev, &dev_kill_list);
5984 unregister_netdevice_many(&dev_kill_list);
5988 static struct pernet_operations __net_initdata default_device_ops = {
5989 .exit = default_device_exit,
5990 .exit_batch = default_device_exit_batch,
5994 * Initialize the DEV module. At boot time this walks the device list and
5995 * unhooks any devices that fail to initialise (normally hardware not
5996 * present) and leaves us with a valid list of present and active devices.
6001 * This is called single threaded during boot, so no need
6002 * to take the rtnl semaphore.
6004 static int __init net_dev_init(void)
6006 int i, rc = -ENOMEM;
6008 BUG_ON(!dev_boot_phase);
6010 if (dev_proc_init())
6013 if (netdev_kobject_init())
6016 INIT_LIST_HEAD(&ptype_all);
6017 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6018 INIT_LIST_HEAD(&ptype_base[i]);
6020 if (register_pernet_subsys(&netdev_net_ops))
6024 * Initialise the packet receive queues.
6027 for_each_possible_cpu(i) {
6028 struct softnet_data *sd = &per_cpu(softnet_data, i);
6030 memset(sd, 0, sizeof(*sd));
6031 skb_queue_head_init(&sd->input_pkt_queue);
6032 skb_queue_head_init(&sd->process_queue);
6033 sd->completion_queue = NULL;
6034 INIT_LIST_HEAD(&sd->poll_list);
6035 sd->output_queue = NULL;
6036 sd->output_queue_tailp = &sd->output_queue;
6038 sd->csd.func = rps_trigger_softirq;
6044 sd->backlog.poll = process_backlog;
6045 sd->backlog.weight = weight_p;
6046 sd->backlog.gro_list = NULL;
6047 sd->backlog.gro_count = 0;
6052 /* The loopback device is special if any other network devices
6053 * is present in a network namespace the loopback device must
6054 * be present. Since we now dynamically allocate and free the
6055 * loopback device ensure this invariant is maintained by
6056 * keeping the loopback device as the first device on the
6057 * list of network devices. Ensuring the loopback devices
6058 * is the first device that appears and the last network device
6061 if (register_pernet_device(&loopback_net_ops))
6064 if (register_pernet_device(&default_device_ops))
6067 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6068 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6070 hotcpu_notifier(dev_cpu_callback, 0);
6078 subsys_initcall(net_dev_init);
6080 static int __init initialize_hashrnd(void)
6082 get_random_bytes(&hashrnd, sizeof(hashrnd));
6086 late_initcall_sync(initialize_hashrnd);