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>
104 #include <linux/if_bridge.h>
105 #include <linux/if_macvlan.h>
107 #include <net/pkt_sched.h>
108 #include <net/checksum.h>
109 #include <net/xfrm.h>
110 #include <linux/highmem.h>
111 #include <linux/init.h>
112 #include <linux/kmod.h>
113 #include <linux/module.h>
114 #include <linux/netpoll.h>
115 #include <linux/rcupdate.h>
116 #include <linux/delay.h>
117 #include <net/wext.h>
118 #include <net/iw_handler.h>
119 #include <asm/current.h>
120 #include <linux/audit.h>
121 #include <linux/dmaengine.h>
122 #include <linux/err.h>
123 #include <linux/ctype.h>
124 #include <linux/if_arp.h>
125 #include <linux/if_vlan.h>
126 #include <linux/ip.h>
128 #include <linux/ipv6.h>
129 #include <linux/in.h>
130 #include <linux/jhash.h>
131 #include <linux/random.h>
132 #include <trace/events/napi.h>
133 #include <linux/pci.h>
135 #include "net-sysfs.h"
137 /* Instead of increasing this, you should create a hash table. */
138 #define MAX_GRO_SKBS 8
140 /* This should be increased if a protocol with a bigger head is added. */
141 #define GRO_MAX_HEAD (MAX_HEADER + 128)
144 * The list of packet types we will receive (as opposed to discard)
145 * and the routines to invoke.
147 * Why 16. Because with 16 the only overlap we get on a hash of the
148 * low nibble of the protocol value is RARP/SNAP/X.25.
150 * NOTE: That is no longer true with the addition of VLAN tags. Not
151 * sure which should go first, but I bet it won't make much
152 * difference if we are running VLANs. The good news is that
153 * this protocol won't be in the list unless compiled in, so
154 * the average user (w/out VLANs) will not be adversely affected.
171 #define PTYPE_HASH_SIZE (16)
172 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
174 static DEFINE_SPINLOCK(ptype_lock);
175 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
176 static struct list_head ptype_all __read_mostly; /* Taps */
179 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
182 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
184 * Writers must hold the rtnl semaphore while they loop through the
185 * dev_base_head list, and hold dev_base_lock for writing when they do the
186 * actual updates. This allows pure readers to access the list even
187 * while a writer is preparing to update it.
189 * To put it another way, dev_base_lock is held for writing only to
190 * protect against pure readers; the rtnl semaphore provides the
191 * protection against other writers.
193 * See, for example usages, register_netdevice() and
194 * unregister_netdevice(), which must be called with the rtnl
197 DEFINE_RWLOCK(dev_base_lock);
198 EXPORT_SYMBOL(dev_base_lock);
200 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
202 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
203 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
206 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
208 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
211 static inline void rps_lock(struct softnet_data *sd)
214 spin_lock(&sd->input_pkt_queue.lock);
218 static inline void rps_unlock(struct softnet_data *sd)
221 spin_unlock(&sd->input_pkt_queue.lock);
225 /* Device list insertion */
226 static int list_netdevice(struct net_device *dev)
228 struct net *net = dev_net(dev);
232 write_lock_bh(&dev_base_lock);
233 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
234 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
235 hlist_add_head_rcu(&dev->index_hlist,
236 dev_index_hash(net, dev->ifindex));
237 write_unlock_bh(&dev_base_lock);
241 /* Device list removal
242 * caller must respect a RCU grace period before freeing/reusing dev
244 static void unlist_netdevice(struct net_device *dev)
248 /* Unlink dev from the device chain */
249 write_lock_bh(&dev_base_lock);
250 list_del_rcu(&dev->dev_list);
251 hlist_del_rcu(&dev->name_hlist);
252 hlist_del_rcu(&dev->index_hlist);
253 write_unlock_bh(&dev_base_lock);
260 static RAW_NOTIFIER_HEAD(netdev_chain);
263 * Device drivers call our routines to queue packets here. We empty the
264 * queue in the local softnet handler.
267 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
268 EXPORT_PER_CPU_SYMBOL(softnet_data);
270 #ifdef CONFIG_LOCKDEP
272 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
273 * according to dev->type
275 static const unsigned short netdev_lock_type[] =
276 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
277 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
278 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
279 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
280 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
281 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
282 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
283 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
284 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
285 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
286 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
287 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
288 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
289 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
290 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
291 ARPHRD_VOID, ARPHRD_NONE};
293 static const char *const netdev_lock_name[] =
294 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
295 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
296 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
297 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
298 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
299 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
300 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
301 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
302 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
303 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
304 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
305 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
306 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
307 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
308 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
309 "_xmit_VOID", "_xmit_NONE"};
311 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
312 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
314 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
318 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
319 if (netdev_lock_type[i] == dev_type)
321 /* the last key is used by default */
322 return ARRAY_SIZE(netdev_lock_type) - 1;
325 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
326 unsigned short dev_type)
330 i = netdev_lock_pos(dev_type);
331 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
332 netdev_lock_name[i]);
335 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
339 i = netdev_lock_pos(dev->type);
340 lockdep_set_class_and_name(&dev->addr_list_lock,
341 &netdev_addr_lock_key[i],
342 netdev_lock_name[i]);
345 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
346 unsigned short dev_type)
349 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
354 /*******************************************************************************
356 Protocol management and registration routines
358 *******************************************************************************/
361 * Add a protocol ID to the list. Now that the input handler is
362 * smarter we can dispense with all the messy stuff that used to be
365 * BEWARE!!! Protocol handlers, mangling input packets,
366 * MUST BE last in hash buckets and checking protocol handlers
367 * MUST start from promiscuous ptype_all chain in net_bh.
368 * It is true now, do not change it.
369 * Explanation follows: if protocol handler, mangling packet, will
370 * be the first on list, it is not able to sense, that packet
371 * is cloned and should be copied-on-write, so that it will
372 * change it and subsequent readers will get broken packet.
377 * dev_add_pack - add packet handler
378 * @pt: packet type declaration
380 * Add a protocol handler to the networking stack. The passed &packet_type
381 * is linked into kernel lists and may not be freed until it has been
382 * removed from the kernel lists.
384 * This call does not sleep therefore it can not
385 * guarantee all CPU's that are in middle of receiving packets
386 * will see the new packet type (until the next received packet).
389 void dev_add_pack(struct packet_type *pt)
393 spin_lock_bh(&ptype_lock);
394 if (pt->type == htons(ETH_P_ALL))
395 list_add_rcu(&pt->list, &ptype_all);
397 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
398 list_add_rcu(&pt->list, &ptype_base[hash]);
400 spin_unlock_bh(&ptype_lock);
402 EXPORT_SYMBOL(dev_add_pack);
405 * __dev_remove_pack - remove packet handler
406 * @pt: packet type declaration
408 * Remove a protocol handler that was previously added to the kernel
409 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
410 * from the kernel lists and can be freed or reused once this function
413 * The packet type might still be in use by receivers
414 * and must not be freed until after all the CPU's have gone
415 * through a quiescent state.
417 void __dev_remove_pack(struct packet_type *pt)
419 struct list_head *head;
420 struct packet_type *pt1;
422 spin_lock_bh(&ptype_lock);
424 if (pt->type == htons(ETH_P_ALL))
427 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
429 list_for_each_entry(pt1, head, list) {
431 list_del_rcu(&pt->list);
436 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
438 spin_unlock_bh(&ptype_lock);
440 EXPORT_SYMBOL(__dev_remove_pack);
443 * dev_remove_pack - remove packet handler
444 * @pt: packet type declaration
446 * Remove a protocol handler that was previously added to the kernel
447 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
448 * from the kernel lists and can be freed or reused once this function
451 * This call sleeps to guarantee that no CPU is looking at the packet
454 void dev_remove_pack(struct packet_type *pt)
456 __dev_remove_pack(pt);
460 EXPORT_SYMBOL(dev_remove_pack);
462 /******************************************************************************
464 Device Boot-time Settings Routines
466 *******************************************************************************/
468 /* Boot time configuration table */
469 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
472 * netdev_boot_setup_add - add new setup entry
473 * @name: name of the device
474 * @map: configured settings for the device
476 * Adds new setup entry to the dev_boot_setup list. The function
477 * returns 0 on error and 1 on success. This is a generic routine to
480 static int netdev_boot_setup_add(char *name, struct ifmap *map)
482 struct netdev_boot_setup *s;
486 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
487 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
488 memset(s[i].name, 0, sizeof(s[i].name));
489 strlcpy(s[i].name, name, IFNAMSIZ);
490 memcpy(&s[i].map, map, sizeof(s[i].map));
495 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
499 * netdev_boot_setup_check - check boot time settings
500 * @dev: the netdevice
502 * Check boot time settings for the device.
503 * The found settings are set for the device to be used
504 * later in the device probing.
505 * Returns 0 if no settings found, 1 if they are.
507 int netdev_boot_setup_check(struct net_device *dev)
509 struct netdev_boot_setup *s = dev_boot_setup;
512 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
513 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
514 !strcmp(dev->name, s[i].name)) {
515 dev->irq = s[i].map.irq;
516 dev->base_addr = s[i].map.base_addr;
517 dev->mem_start = s[i].map.mem_start;
518 dev->mem_end = s[i].map.mem_end;
524 EXPORT_SYMBOL(netdev_boot_setup_check);
528 * netdev_boot_base - get address from boot time settings
529 * @prefix: prefix for network device
530 * @unit: id for network device
532 * Check boot time settings for the base address of device.
533 * The found settings are set for the device to be used
534 * later in the device probing.
535 * Returns 0 if no settings found.
537 unsigned long netdev_boot_base(const char *prefix, int unit)
539 const struct netdev_boot_setup *s = dev_boot_setup;
543 sprintf(name, "%s%d", prefix, unit);
546 * If device already registered then return base of 1
547 * to indicate not to probe for this interface
549 if (__dev_get_by_name(&init_net, name))
552 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
553 if (!strcmp(name, s[i].name))
554 return s[i].map.base_addr;
559 * Saves at boot time configured settings for any netdevice.
561 int __init netdev_boot_setup(char *str)
566 str = get_options(str, ARRAY_SIZE(ints), ints);
571 memset(&map, 0, sizeof(map));
575 map.base_addr = ints[2];
577 map.mem_start = ints[3];
579 map.mem_end = ints[4];
581 /* Add new entry to the list */
582 return netdev_boot_setup_add(str, &map);
585 __setup("netdev=", netdev_boot_setup);
587 /*******************************************************************************
589 Device Interface Subroutines
591 *******************************************************************************/
594 * __dev_get_by_name - find a device by its name
595 * @net: the applicable net namespace
596 * @name: name to find
598 * Find an interface by name. Must be called under RTNL semaphore
599 * or @dev_base_lock. If the name is found a pointer to the device
600 * is returned. If the name is not found then %NULL is returned. The
601 * reference counters are not incremented so the caller must be
602 * careful with locks.
605 struct net_device *__dev_get_by_name(struct net *net, const char *name)
607 struct hlist_node *p;
608 struct net_device *dev;
609 struct hlist_head *head = dev_name_hash(net, name);
611 hlist_for_each_entry(dev, p, head, name_hlist)
612 if (!strncmp(dev->name, name, IFNAMSIZ))
617 EXPORT_SYMBOL(__dev_get_by_name);
620 * dev_get_by_name_rcu - find a device by its name
621 * @net: the applicable net namespace
622 * @name: name to find
624 * Find an interface by name.
625 * If the name is found a pointer to the device is returned.
626 * If the name is not found then %NULL is returned.
627 * The reference counters are not incremented so the caller must be
628 * careful with locks. The caller must hold RCU lock.
631 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
633 struct hlist_node *p;
634 struct net_device *dev;
635 struct hlist_head *head = dev_name_hash(net, name);
637 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
638 if (!strncmp(dev->name, name, IFNAMSIZ))
643 EXPORT_SYMBOL(dev_get_by_name_rcu);
646 * dev_get_by_name - find a device by its name
647 * @net: the applicable net namespace
648 * @name: name to find
650 * Find an interface by name. This can be called from any
651 * context and does its own locking. The returned handle has
652 * the usage count incremented and the caller must use dev_put() to
653 * release it when it is no longer needed. %NULL is returned if no
654 * matching device is found.
657 struct net_device *dev_get_by_name(struct net *net, const char *name)
659 struct net_device *dev;
662 dev = dev_get_by_name_rcu(net, name);
668 EXPORT_SYMBOL(dev_get_by_name);
671 * __dev_get_by_index - find a device by its ifindex
672 * @net: the applicable net namespace
673 * @ifindex: index of device
675 * Search for an interface by index. Returns %NULL if the device
676 * is not found or a pointer to the device. The device has not
677 * had its reference counter increased so the caller must be careful
678 * about locking. The caller must hold either the RTNL semaphore
682 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
684 struct hlist_node *p;
685 struct net_device *dev;
686 struct hlist_head *head = dev_index_hash(net, ifindex);
688 hlist_for_each_entry(dev, p, head, index_hlist)
689 if (dev->ifindex == ifindex)
694 EXPORT_SYMBOL(__dev_get_by_index);
697 * dev_get_by_index_rcu - find a device by its ifindex
698 * @net: the applicable net namespace
699 * @ifindex: index of device
701 * Search for an interface by index. Returns %NULL if the device
702 * is not found or a pointer to the device. The device has not
703 * had its reference counter increased so the caller must be careful
704 * about locking. The caller must hold RCU lock.
707 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
709 struct hlist_node *p;
710 struct net_device *dev;
711 struct hlist_head *head = dev_index_hash(net, ifindex);
713 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
714 if (dev->ifindex == ifindex)
719 EXPORT_SYMBOL(dev_get_by_index_rcu);
723 * dev_get_by_index - find a device by its ifindex
724 * @net: the applicable net namespace
725 * @ifindex: index of device
727 * Search for an interface by index. Returns NULL if the device
728 * is not found or a pointer to the device. The device returned has
729 * had a reference added and the pointer is safe until the user calls
730 * dev_put to indicate they have finished with it.
733 struct net_device *dev_get_by_index(struct net *net, int ifindex)
735 struct net_device *dev;
738 dev = dev_get_by_index_rcu(net, ifindex);
744 EXPORT_SYMBOL(dev_get_by_index);
747 * dev_getbyhwaddr - find a device by its hardware address
748 * @net: the applicable net namespace
749 * @type: media type of device
750 * @ha: hardware address
752 * Search for an interface by MAC address. Returns NULL if the device
753 * is not found or a pointer to the device. The caller must hold the
754 * rtnl semaphore. The returned device has not had its ref count increased
755 * and the caller must therefore be careful about locking
758 * If the API was consistent this would be __dev_get_by_hwaddr
761 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
763 struct net_device *dev;
767 for_each_netdev(net, dev)
768 if (dev->type == type &&
769 !memcmp(dev->dev_addr, ha, dev->addr_len))
774 EXPORT_SYMBOL(dev_getbyhwaddr);
776 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
778 struct net_device *dev;
781 for_each_netdev(net, dev)
782 if (dev->type == type)
787 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
789 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
791 struct net_device *dev, *ret = NULL;
794 for_each_netdev_rcu(net, dev)
795 if (dev->type == type) {
803 EXPORT_SYMBOL(dev_getfirstbyhwtype);
806 * dev_get_by_flags - find any device with given flags
807 * @net: the applicable net namespace
808 * @if_flags: IFF_* values
809 * @mask: bitmask of bits in if_flags to check
811 * Search for any interface with the given flags. Returns NULL if a device
812 * is not found or a pointer to the device. The device returned has
813 * had a reference added and the pointer is safe until the user calls
814 * dev_put to indicate they have finished with it.
817 struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
820 struct net_device *dev, *ret;
824 for_each_netdev_rcu(net, dev) {
825 if (((dev->flags ^ if_flags) & mask) == 0) {
834 EXPORT_SYMBOL(dev_get_by_flags);
837 * dev_valid_name - check if name is okay for network device
840 * Network device names need to be valid file names to
841 * to allow sysfs to work. We also disallow any kind of
844 int dev_valid_name(const char *name)
848 if (strlen(name) >= IFNAMSIZ)
850 if (!strcmp(name, ".") || !strcmp(name, ".."))
854 if (*name == '/' || isspace(*name))
860 EXPORT_SYMBOL(dev_valid_name);
863 * __dev_alloc_name - allocate a name for a device
864 * @net: network namespace to allocate the device name in
865 * @name: name format string
866 * @buf: scratch buffer and result name string
868 * Passed a format string - eg "lt%d" it will try and find a suitable
869 * id. It scans list of devices to build up a free map, then chooses
870 * the first empty slot. The caller must hold the dev_base or rtnl lock
871 * while allocating the name and adding the device in order to avoid
873 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
874 * Returns the number of the unit assigned or a negative errno code.
877 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
881 const int max_netdevices = 8*PAGE_SIZE;
882 unsigned long *inuse;
883 struct net_device *d;
885 p = strnchr(name, IFNAMSIZ-1, '%');
888 * Verify the string as this thing may have come from
889 * the user. There must be either one "%d" and no other "%"
892 if (p[1] != 'd' || strchr(p + 2, '%'))
895 /* Use one page as a bit array of possible slots */
896 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
900 for_each_netdev(net, d) {
901 if (!sscanf(d->name, name, &i))
903 if (i < 0 || i >= max_netdevices)
906 /* avoid cases where sscanf is not exact inverse of printf */
907 snprintf(buf, IFNAMSIZ, name, i);
908 if (!strncmp(buf, d->name, IFNAMSIZ))
912 i = find_first_zero_bit(inuse, max_netdevices);
913 free_page((unsigned long) inuse);
917 snprintf(buf, IFNAMSIZ, name, i);
918 if (!__dev_get_by_name(net, buf))
921 /* It is possible to run out of possible slots
922 * when the name is long and there isn't enough space left
923 * for the digits, or if all bits are used.
929 * dev_alloc_name - allocate a name for a device
931 * @name: name format string
933 * Passed a format string - eg "lt%d" it will try and find a suitable
934 * id. It scans list of devices to build up a free map, then chooses
935 * the first empty slot. The caller must hold the dev_base or rtnl lock
936 * while allocating the name and adding the device in order to avoid
938 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
939 * Returns the number of the unit assigned or a negative errno code.
942 int dev_alloc_name(struct net_device *dev, const char *name)
948 BUG_ON(!dev_net(dev));
950 ret = __dev_alloc_name(net, name, buf);
952 strlcpy(dev->name, buf, IFNAMSIZ);
955 EXPORT_SYMBOL(dev_alloc_name);
957 static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt)
961 BUG_ON(!dev_net(dev));
964 if (!dev_valid_name(name))
967 if (fmt && strchr(name, '%'))
968 return dev_alloc_name(dev, name);
969 else if (__dev_get_by_name(net, name))
971 else if (dev->name != name)
972 strlcpy(dev->name, name, IFNAMSIZ);
978 * dev_change_name - change name of a device
980 * @newname: name (or format string) must be at least IFNAMSIZ
982 * Change name of a device, can pass format strings "eth%d".
985 int dev_change_name(struct net_device *dev, const char *newname)
987 char oldname[IFNAMSIZ];
993 BUG_ON(!dev_net(dev));
996 if (dev->flags & IFF_UP)
999 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
1002 memcpy(oldname, dev->name, IFNAMSIZ);
1004 err = dev_get_valid_name(dev, newname, 1);
1009 ret = device_rename(&dev->dev, dev->name);
1011 memcpy(dev->name, oldname, IFNAMSIZ);
1015 write_lock_bh(&dev_base_lock);
1016 hlist_del(&dev->name_hlist);
1017 write_unlock_bh(&dev_base_lock);
1021 write_lock_bh(&dev_base_lock);
1022 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1023 write_unlock_bh(&dev_base_lock);
1025 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1026 ret = notifier_to_errno(ret);
1029 /* err >= 0 after dev_alloc_name() or stores the first errno */
1032 memcpy(dev->name, oldname, IFNAMSIZ);
1036 "%s: name change rollback failed: %d.\n",
1045 * dev_set_alias - change ifalias of a device
1047 * @alias: name up to IFALIASZ
1048 * @len: limit of bytes to copy from info
1050 * Set ifalias for a device,
1052 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1056 if (len >= IFALIASZ)
1061 kfree(dev->ifalias);
1062 dev->ifalias = NULL;
1067 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1071 strlcpy(dev->ifalias, alias, len+1);
1077 * netdev_features_change - device changes features
1078 * @dev: device to cause notification
1080 * Called to indicate a device has changed features.
1082 void netdev_features_change(struct net_device *dev)
1084 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1086 EXPORT_SYMBOL(netdev_features_change);
1089 * netdev_state_change - device changes state
1090 * @dev: device to cause notification
1092 * Called to indicate a device has changed state. This function calls
1093 * the notifier chains for netdev_chain and sends a NEWLINK message
1094 * to the routing socket.
1096 void netdev_state_change(struct net_device *dev)
1098 if (dev->flags & IFF_UP) {
1099 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1100 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1103 EXPORT_SYMBOL(netdev_state_change);
1105 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1107 return call_netdevice_notifiers(event, dev);
1109 EXPORT_SYMBOL(netdev_bonding_change);
1112 * dev_load - load a network module
1113 * @net: the applicable net namespace
1114 * @name: name of interface
1116 * If a network interface is not present and the process has suitable
1117 * privileges this function loads the module. If module loading is not
1118 * available in this kernel then it becomes a nop.
1121 void dev_load(struct net *net, const char *name)
1123 struct net_device *dev;
1126 dev = dev_get_by_name_rcu(net, name);
1129 if (!dev && capable(CAP_NET_ADMIN))
1130 request_module("%s", name);
1132 EXPORT_SYMBOL(dev_load);
1134 static int __dev_open(struct net_device *dev)
1136 const struct net_device_ops *ops = dev->netdev_ops;
1142 * Is it even present?
1144 if (!netif_device_present(dev))
1147 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1148 ret = notifier_to_errno(ret);
1153 * Call device private open method
1155 set_bit(__LINK_STATE_START, &dev->state);
1157 if (ops->ndo_validate_addr)
1158 ret = ops->ndo_validate_addr(dev);
1160 if (!ret && ops->ndo_open)
1161 ret = ops->ndo_open(dev);
1164 * If it went open OK then:
1168 clear_bit(__LINK_STATE_START, &dev->state);
1173 dev->flags |= IFF_UP;
1178 net_dmaengine_get();
1181 * Initialize multicasting status
1183 dev_set_rx_mode(dev);
1186 * Wakeup transmit queue engine
1195 * dev_open - prepare an interface for use.
1196 * @dev: device to open
1198 * Takes a device from down to up state. The device's private open
1199 * function is invoked and then the multicast lists are loaded. Finally
1200 * the device is moved into the up state and a %NETDEV_UP message is
1201 * sent to the netdev notifier chain.
1203 * Calling this function on an active interface is a nop. On a failure
1204 * a negative errno code is returned.
1206 int dev_open(struct net_device *dev)
1213 if (dev->flags & IFF_UP)
1219 ret = __dev_open(dev);
1224 * ... and announce new interface.
1226 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1227 call_netdevice_notifiers(NETDEV_UP, dev);
1231 EXPORT_SYMBOL(dev_open);
1233 static int __dev_close(struct net_device *dev)
1235 const struct net_device_ops *ops = dev->netdev_ops;
1241 * Tell people we are going down, so that they can
1242 * prepare to death, when device is still operating.
1244 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1246 clear_bit(__LINK_STATE_START, &dev->state);
1248 /* Synchronize to scheduled poll. We cannot touch poll list,
1249 * it can be even on different cpu. So just clear netif_running().
1251 * dev->stop() will invoke napi_disable() on all of it's
1252 * napi_struct instances on this device.
1254 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1256 dev_deactivate(dev);
1259 * Call the device specific close. This cannot fail.
1260 * Only if device is UP
1262 * We allow it to be called even after a DETACH hot-plug
1269 * Device is now down.
1272 dev->flags &= ~IFF_UP;
1277 net_dmaengine_put();
1283 * dev_close - shutdown an interface.
1284 * @dev: device to shutdown
1286 * This function moves an active device into down state. A
1287 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1288 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1291 int dev_close(struct net_device *dev)
1293 if (!(dev->flags & IFF_UP))
1299 * Tell people we are down
1301 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1302 call_netdevice_notifiers(NETDEV_DOWN, dev);
1306 EXPORT_SYMBOL(dev_close);
1310 * dev_disable_lro - disable Large Receive Offload on a device
1313 * Disable Large Receive Offload (LRO) on a net device. Must be
1314 * called under RTNL. This is needed if received packets may be
1315 * forwarded to another interface.
1317 void dev_disable_lro(struct net_device *dev)
1319 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1320 dev->ethtool_ops->set_flags) {
1321 u32 flags = dev->ethtool_ops->get_flags(dev);
1322 if (flags & ETH_FLAG_LRO) {
1323 flags &= ~ETH_FLAG_LRO;
1324 dev->ethtool_ops->set_flags(dev, flags);
1327 WARN_ON(dev->features & NETIF_F_LRO);
1329 EXPORT_SYMBOL(dev_disable_lro);
1332 static int dev_boot_phase = 1;
1335 * Device change register/unregister. These are not inline or static
1336 * as we export them to the world.
1340 * register_netdevice_notifier - register a network notifier block
1343 * Register a notifier to be called when network device events occur.
1344 * The notifier passed is linked into the kernel structures and must
1345 * not be reused until it has been unregistered. A negative errno code
1346 * is returned on a failure.
1348 * When registered all registration and up events are replayed
1349 * to the new notifier to allow device to have a race free
1350 * view of the network device list.
1353 int register_netdevice_notifier(struct notifier_block *nb)
1355 struct net_device *dev;
1356 struct net_device *last;
1361 err = raw_notifier_chain_register(&netdev_chain, nb);
1367 for_each_netdev(net, dev) {
1368 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1369 err = notifier_to_errno(err);
1373 if (!(dev->flags & IFF_UP))
1376 nb->notifier_call(nb, NETDEV_UP, dev);
1387 for_each_netdev(net, dev) {
1391 if (dev->flags & IFF_UP) {
1392 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1393 nb->notifier_call(nb, NETDEV_DOWN, dev);
1395 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1396 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1400 raw_notifier_chain_unregister(&netdev_chain, nb);
1403 EXPORT_SYMBOL(register_netdevice_notifier);
1406 * unregister_netdevice_notifier - unregister a network notifier block
1409 * Unregister a notifier previously registered by
1410 * register_netdevice_notifier(). The notifier is unlinked into the
1411 * kernel structures and may then be reused. A negative errno code
1412 * is returned on a failure.
1415 int unregister_netdevice_notifier(struct notifier_block *nb)
1420 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1424 EXPORT_SYMBOL(unregister_netdevice_notifier);
1427 * call_netdevice_notifiers - call all network notifier blocks
1428 * @val: value passed unmodified to notifier function
1429 * @dev: net_device pointer passed unmodified to notifier function
1431 * Call all network notifier blocks. Parameters and return value
1432 * are as for raw_notifier_call_chain().
1435 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1438 return raw_notifier_call_chain(&netdev_chain, val, dev);
1441 /* When > 0 there are consumers of rx skb time stamps */
1442 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1444 void net_enable_timestamp(void)
1446 atomic_inc(&netstamp_needed);
1448 EXPORT_SYMBOL(net_enable_timestamp);
1450 void net_disable_timestamp(void)
1452 atomic_dec(&netstamp_needed);
1454 EXPORT_SYMBOL(net_disable_timestamp);
1456 static inline void net_timestamp_set(struct sk_buff *skb)
1458 if (atomic_read(&netstamp_needed))
1459 __net_timestamp(skb);
1461 skb->tstamp.tv64 = 0;
1464 static inline void net_timestamp_check(struct sk_buff *skb)
1466 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1467 __net_timestamp(skb);
1471 * dev_forward_skb - loopback an skb to another netif
1473 * @dev: destination network device
1474 * @skb: buffer to forward
1477 * NET_RX_SUCCESS (no congestion)
1478 * NET_RX_DROP (packet was dropped, but freed)
1480 * dev_forward_skb can be used for injecting an skb from the
1481 * start_xmit function of one device into the receive queue
1482 * of another device.
1484 * The receiving device may be in another namespace, so
1485 * we have to clear all information in the skb that could
1486 * impact namespace isolation.
1488 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1492 if (!(dev->flags & IFF_UP) ||
1493 (skb->len > (dev->mtu + dev->hard_header_len))) {
1497 skb_set_dev(skb, dev);
1498 skb->tstamp.tv64 = 0;
1499 skb->pkt_type = PACKET_HOST;
1500 skb->protocol = eth_type_trans(skb, dev);
1501 return netif_rx(skb);
1503 EXPORT_SYMBOL_GPL(dev_forward_skb);
1506 * Support routine. Sends outgoing frames to any network
1507 * taps currently in use.
1510 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1512 struct packet_type *ptype;
1514 #ifdef CONFIG_NET_CLS_ACT
1515 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1516 net_timestamp_set(skb);
1518 net_timestamp_set(skb);
1522 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1523 /* Never send packets back to the socket
1524 * they originated from - MvS (miquels@drinkel.ow.org)
1526 if ((ptype->dev == dev || !ptype->dev) &&
1527 (ptype->af_packet_priv == NULL ||
1528 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1529 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1533 /* skb->nh should be correctly
1534 set by sender, so that the second statement is
1535 just protection against buggy protocols.
1537 skb_reset_mac_header(skb2);
1539 if (skb_network_header(skb2) < skb2->data ||
1540 skb2->network_header > skb2->tail) {
1541 if (net_ratelimit())
1542 printk(KERN_CRIT "protocol %04x is "
1544 skb2->protocol, dev->name);
1545 skb_reset_network_header(skb2);
1548 skb2->transport_header = skb2->network_header;
1549 skb2->pkt_type = PACKET_OUTGOING;
1550 ptype->func(skb2, skb->dev, ptype, skb->dev);
1557 static inline void __netif_reschedule(struct Qdisc *q)
1559 struct softnet_data *sd;
1560 unsigned long flags;
1562 local_irq_save(flags);
1563 sd = &__get_cpu_var(softnet_data);
1564 q->next_sched = NULL;
1565 *sd->output_queue_tailp = q;
1566 sd->output_queue_tailp = &q->next_sched;
1567 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1568 local_irq_restore(flags);
1571 void __netif_schedule(struct Qdisc *q)
1573 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1574 __netif_reschedule(q);
1576 EXPORT_SYMBOL(__netif_schedule);
1578 void dev_kfree_skb_irq(struct sk_buff *skb)
1580 if (!skb->destructor)
1582 else if (atomic_dec_and_test(&skb->users)) {
1583 struct softnet_data *sd;
1584 unsigned long flags;
1586 local_irq_save(flags);
1587 sd = &__get_cpu_var(softnet_data);
1588 skb->next = sd->completion_queue;
1589 sd->completion_queue = skb;
1590 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1591 local_irq_restore(flags);
1594 EXPORT_SYMBOL(dev_kfree_skb_irq);
1596 void dev_kfree_skb_any(struct sk_buff *skb)
1598 if (in_irq() || irqs_disabled())
1599 dev_kfree_skb_irq(skb);
1603 EXPORT_SYMBOL(dev_kfree_skb_any);
1607 * netif_device_detach - mark device as removed
1608 * @dev: network device
1610 * Mark device as removed from system and therefore no longer available.
1612 void netif_device_detach(struct net_device *dev)
1614 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1615 netif_running(dev)) {
1616 netif_tx_stop_all_queues(dev);
1619 EXPORT_SYMBOL(netif_device_detach);
1622 * netif_device_attach - mark device as attached
1623 * @dev: network device
1625 * Mark device as attached from system and restart if needed.
1627 void netif_device_attach(struct net_device *dev)
1629 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1630 netif_running(dev)) {
1631 netif_tx_wake_all_queues(dev);
1632 __netdev_watchdog_up(dev);
1635 EXPORT_SYMBOL(netif_device_attach);
1637 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1639 return ((features & NETIF_F_GEN_CSUM) ||
1640 ((features & NETIF_F_IP_CSUM) &&
1641 protocol == htons(ETH_P_IP)) ||
1642 ((features & NETIF_F_IPV6_CSUM) &&
1643 protocol == htons(ETH_P_IPV6)) ||
1644 ((features & NETIF_F_FCOE_CRC) &&
1645 protocol == htons(ETH_P_FCOE)));
1648 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1650 if (can_checksum_protocol(dev->features, skb->protocol))
1653 if (skb->protocol == htons(ETH_P_8021Q)) {
1654 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1655 if (can_checksum_protocol(dev->features & dev->vlan_features,
1656 veh->h_vlan_encapsulated_proto))
1664 * skb_dev_set -- assign a new device to a buffer
1665 * @skb: buffer for the new device
1666 * @dev: network device
1668 * If an skb is owned by a device already, we have to reset
1669 * all data private to the namespace a device belongs to
1670 * before assigning it a new device.
1672 #ifdef CONFIG_NET_NS
1673 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1676 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1679 skb_init_secmark(skb);
1683 skb->ipvs_property = 0;
1684 #ifdef CONFIG_NET_SCHED
1690 EXPORT_SYMBOL(skb_set_dev);
1691 #endif /* CONFIG_NET_NS */
1694 * Invalidate hardware checksum when packet is to be mangled, and
1695 * complete checksum manually on outgoing path.
1697 int skb_checksum_help(struct sk_buff *skb)
1700 int ret = 0, offset;
1702 if (skb->ip_summed == CHECKSUM_COMPLETE)
1703 goto out_set_summed;
1705 if (unlikely(skb_shinfo(skb)->gso_size)) {
1706 /* Let GSO fix up the checksum. */
1707 goto out_set_summed;
1710 offset = skb->csum_start - skb_headroom(skb);
1711 BUG_ON(offset >= skb_headlen(skb));
1712 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1714 offset += skb->csum_offset;
1715 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1717 if (skb_cloned(skb) &&
1718 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1719 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1724 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1726 skb->ip_summed = CHECKSUM_NONE;
1730 EXPORT_SYMBOL(skb_checksum_help);
1733 * skb_gso_segment - Perform segmentation on skb.
1734 * @skb: buffer to segment
1735 * @features: features for the output path (see dev->features)
1737 * This function segments the given skb and returns a list of segments.
1739 * It may return NULL if the skb requires no segmentation. This is
1740 * only possible when GSO is used for verifying header integrity.
1742 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1744 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1745 struct packet_type *ptype;
1746 __be16 type = skb->protocol;
1749 skb_reset_mac_header(skb);
1750 skb->mac_len = skb->network_header - skb->mac_header;
1751 __skb_pull(skb, skb->mac_len);
1753 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1754 struct net_device *dev = skb->dev;
1755 struct ethtool_drvinfo info = {};
1757 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1758 dev->ethtool_ops->get_drvinfo(dev, &info);
1760 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1762 info.driver, dev ? dev->features : 0L,
1763 skb->sk ? skb->sk->sk_route_caps : 0L,
1764 skb->len, skb->data_len, skb->ip_summed);
1766 if (skb_header_cloned(skb) &&
1767 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1768 return ERR_PTR(err);
1772 list_for_each_entry_rcu(ptype,
1773 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1774 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1775 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1776 err = ptype->gso_send_check(skb);
1777 segs = ERR_PTR(err);
1778 if (err || skb_gso_ok(skb, features))
1780 __skb_push(skb, (skb->data -
1781 skb_network_header(skb)));
1783 segs = ptype->gso_segment(skb, features);
1789 __skb_push(skb, skb->data - skb_mac_header(skb));
1793 EXPORT_SYMBOL(skb_gso_segment);
1795 /* Take action when hardware reception checksum errors are detected. */
1797 void netdev_rx_csum_fault(struct net_device *dev)
1799 if (net_ratelimit()) {
1800 printk(KERN_ERR "%s: hw csum failure.\n",
1801 dev ? dev->name : "<unknown>");
1805 EXPORT_SYMBOL(netdev_rx_csum_fault);
1808 /* Actually, we should eliminate this check as soon as we know, that:
1809 * 1. IOMMU is present and allows to map all the memory.
1810 * 2. No high memory really exists on this machine.
1813 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1815 #ifdef CONFIG_HIGHMEM
1817 if (!(dev->features & NETIF_F_HIGHDMA)) {
1818 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1819 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1823 if (PCI_DMA_BUS_IS_PHYS) {
1824 struct device *pdev = dev->dev.parent;
1828 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1829 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1830 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1839 void (*destructor)(struct sk_buff *skb);
1842 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1844 static void dev_gso_skb_destructor(struct sk_buff *skb)
1846 struct dev_gso_cb *cb;
1849 struct sk_buff *nskb = skb->next;
1851 skb->next = nskb->next;
1854 } while (skb->next);
1856 cb = DEV_GSO_CB(skb);
1858 cb->destructor(skb);
1862 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1863 * @skb: buffer to segment
1865 * This function segments the given skb and stores the list of segments
1868 static int dev_gso_segment(struct sk_buff *skb)
1870 struct net_device *dev = skb->dev;
1871 struct sk_buff *segs;
1872 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1875 segs = skb_gso_segment(skb, features);
1877 /* Verifying header integrity only. */
1882 return PTR_ERR(segs);
1885 DEV_GSO_CB(skb)->destructor = skb->destructor;
1886 skb->destructor = dev_gso_skb_destructor;
1892 * Try to orphan skb early, right before transmission by the device.
1893 * We cannot orphan skb if tx timestamp is requested, since
1894 * drivers need to call skb_tstamp_tx() to send the timestamp.
1896 static inline void skb_orphan_try(struct sk_buff *skb)
1898 if (!skb_tx(skb)->flags)
1902 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1903 struct netdev_queue *txq)
1905 const struct net_device_ops *ops = dev->netdev_ops;
1906 int rc = NETDEV_TX_OK;
1908 if (likely(!skb->next)) {
1909 if (!list_empty(&ptype_all))
1910 dev_queue_xmit_nit(skb, dev);
1913 * If device doesnt need skb->dst, release it right now while
1914 * its hot in this cpu cache
1916 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1919 skb_orphan_try(skb);
1921 if (netif_needs_gso(dev, skb)) {
1922 if (unlikely(dev_gso_segment(skb)))
1928 rc = ops->ndo_start_xmit(skb, dev);
1929 if (rc == NETDEV_TX_OK)
1930 txq_trans_update(txq);
1936 struct sk_buff *nskb = skb->next;
1938 skb->next = nskb->next;
1942 * If device doesnt need nskb->dst, release it right now while
1943 * its hot in this cpu cache
1945 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1948 rc = ops->ndo_start_xmit(nskb, dev);
1949 if (unlikely(rc != NETDEV_TX_OK)) {
1950 if (rc & ~NETDEV_TX_MASK)
1951 goto out_kfree_gso_skb;
1952 nskb->next = skb->next;
1956 txq_trans_update(txq);
1957 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1958 return NETDEV_TX_BUSY;
1959 } while (skb->next);
1962 if (likely(skb->next == NULL))
1963 skb->destructor = DEV_GSO_CB(skb)->destructor;
1969 static u32 hashrnd __read_mostly;
1971 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1975 if (skb_rx_queue_recorded(skb)) {
1976 hash = skb_get_rx_queue(skb);
1977 while (unlikely(hash >= dev->real_num_tx_queues))
1978 hash -= dev->real_num_tx_queues;
1982 if (skb->sk && skb->sk->sk_hash)
1983 hash = skb->sk->sk_hash;
1985 hash = (__force u16) skb->protocol;
1987 hash = jhash_1word(hash, hashrnd);
1989 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1991 EXPORT_SYMBOL(skb_tx_hash);
1993 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
1995 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
1996 if (net_ratelimit()) {
1997 pr_warning("%s selects TX queue %d, but "
1998 "real number of TX queues is %d\n",
1999 dev->name, queue_index, dev->real_num_tx_queues);
2006 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2007 struct sk_buff *skb)
2010 struct sock *sk = skb->sk;
2012 if (sk_tx_queue_recorded(sk)) {
2013 queue_index = sk_tx_queue_get(sk);
2015 const struct net_device_ops *ops = dev->netdev_ops;
2017 if (ops->ndo_select_queue) {
2018 queue_index = ops->ndo_select_queue(dev, skb);
2019 queue_index = dev_cap_txqueue(dev, queue_index);
2022 if (dev->real_num_tx_queues > 1)
2023 queue_index = skb_tx_hash(dev, skb);
2026 struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
2028 if (dst && skb_dst(skb) == dst)
2029 sk_tx_queue_set(sk, queue_index);
2034 skb_set_queue_mapping(skb, queue_index);
2035 return netdev_get_tx_queue(dev, queue_index);
2038 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2039 struct net_device *dev,
2040 struct netdev_queue *txq)
2042 spinlock_t *root_lock = qdisc_lock(q);
2043 bool contended = qdisc_is_running(q);
2047 * Heuristic to force contended enqueues to serialize on a
2048 * separate lock before trying to get qdisc main lock.
2049 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2050 * and dequeue packets faster.
2052 if (unlikely(contended))
2053 spin_lock(&q->busylock);
2055 spin_lock(root_lock);
2056 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2059 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2060 qdisc_run_begin(q)) {
2062 * This is a work-conserving queue; there are no old skbs
2063 * waiting to be sent out; and the qdisc is not running -
2064 * xmit the skb directly.
2066 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2068 __qdisc_update_bstats(q, skb->len);
2069 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2070 if (unlikely(contended)) {
2071 spin_unlock(&q->busylock);
2078 rc = NET_XMIT_SUCCESS;
2081 rc = qdisc_enqueue_root(skb, q);
2082 if (qdisc_run_begin(q)) {
2083 if (unlikely(contended)) {
2084 spin_unlock(&q->busylock);
2090 spin_unlock(root_lock);
2091 if (unlikely(contended))
2092 spin_unlock(&q->busylock);
2097 * Returns true if either:
2098 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2099 * 2. skb is fragmented and the device does not support SG, or if
2100 * at least one of fragments is in highmem and device does not
2101 * support DMA from it.
2103 static inline int skb_needs_linearize(struct sk_buff *skb,
2104 struct net_device *dev)
2106 return skb_is_nonlinear(skb) &&
2107 ((skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
2108 (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
2109 illegal_highdma(dev, skb))));
2113 * dev_queue_xmit - transmit a buffer
2114 * @skb: buffer to transmit
2116 * Queue a buffer for transmission to a network device. The caller must
2117 * have set the device and priority and built the buffer before calling
2118 * this function. The function can be called from an interrupt.
2120 * A negative errno code is returned on a failure. A success does not
2121 * guarantee the frame will be transmitted as it may be dropped due
2122 * to congestion or traffic shaping.
2124 * -----------------------------------------------------------------------------------
2125 * I notice this method can also return errors from the queue disciplines,
2126 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2129 * Regardless of the return value, the skb is consumed, so it is currently
2130 * difficult to retry a send to this method. (You can bump the ref count
2131 * before sending to hold a reference for retry if you are careful.)
2133 * When calling this method, interrupts MUST be enabled. This is because
2134 * the BH enable code must have IRQs enabled so that it will not deadlock.
2137 int dev_queue_xmit(struct sk_buff *skb)
2139 struct net_device *dev = skb->dev;
2140 struct netdev_queue *txq;
2144 /* GSO will handle the following emulations directly. */
2145 if (netif_needs_gso(dev, skb))
2148 /* Convert a paged skb to linear, if required */
2149 if (skb_needs_linearize(skb, dev) && __skb_linearize(skb))
2152 /* If packet is not checksummed and device does not support
2153 * checksumming for this protocol, complete checksumming here.
2155 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2156 skb_set_transport_header(skb, skb->csum_start -
2158 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
2163 /* Disable soft irqs for various locks below. Also
2164 * stops preemption for RCU.
2168 txq = dev_pick_tx(dev, skb);
2169 q = rcu_dereference_bh(txq->qdisc);
2171 #ifdef CONFIG_NET_CLS_ACT
2172 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2175 rc = __dev_xmit_skb(skb, q, dev, txq);
2179 /* The device has no queue. Common case for software devices:
2180 loopback, all the sorts of tunnels...
2182 Really, it is unlikely that netif_tx_lock protection is necessary
2183 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2185 However, it is possible, that they rely on protection
2188 Check this and shot the lock. It is not prone from deadlocks.
2189 Either shot noqueue qdisc, it is even simpler 8)
2191 if (dev->flags & IFF_UP) {
2192 int cpu = smp_processor_id(); /* ok because BHs are off */
2194 if (txq->xmit_lock_owner != cpu) {
2196 HARD_TX_LOCK(dev, txq, cpu);
2198 if (!netif_tx_queue_stopped(txq)) {
2199 rc = dev_hard_start_xmit(skb, dev, txq);
2200 if (dev_xmit_complete(rc)) {
2201 HARD_TX_UNLOCK(dev, txq);
2205 HARD_TX_UNLOCK(dev, txq);
2206 if (net_ratelimit())
2207 printk(KERN_CRIT "Virtual device %s asks to "
2208 "queue packet!\n", dev->name);
2210 /* Recursion is detected! It is possible,
2212 if (net_ratelimit())
2213 printk(KERN_CRIT "Dead loop on virtual device "
2214 "%s, fix it urgently!\n", dev->name);
2219 rcu_read_unlock_bh();
2225 rcu_read_unlock_bh();
2228 EXPORT_SYMBOL(dev_queue_xmit);
2231 /*=======================================================================
2233 =======================================================================*/
2235 int netdev_max_backlog __read_mostly = 1000;
2236 int netdev_tstamp_prequeue __read_mostly = 1;
2237 int netdev_budget __read_mostly = 300;
2238 int weight_p __read_mostly = 64; /* old backlog weight */
2240 /* Called with irq disabled */
2241 static inline void ____napi_schedule(struct softnet_data *sd,
2242 struct napi_struct *napi)
2244 list_add_tail(&napi->poll_list, &sd->poll_list);
2245 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2250 /* One global table that all flow-based protocols share. */
2251 struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
2252 EXPORT_SYMBOL(rps_sock_flow_table);
2255 * get_rps_cpu is called from netif_receive_skb and returns the target
2256 * CPU from the RPS map of the receiving queue for a given skb.
2257 * rcu_read_lock must be held on entry.
2259 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2260 struct rps_dev_flow **rflowp)
2262 struct ipv6hdr *ip6;
2264 struct netdev_rx_queue *rxqueue;
2265 struct rps_map *map;
2266 struct rps_dev_flow_table *flow_table;
2267 struct rps_sock_flow_table *sock_flow_table;
2271 u32 addr1, addr2, ihl;
2277 if (skb_rx_queue_recorded(skb)) {
2278 u16 index = skb_get_rx_queue(skb);
2279 if (unlikely(index >= dev->num_rx_queues)) {
2280 if (net_ratelimit()) {
2281 pr_warning("%s received packet on queue "
2282 "%u, but number of RX queues is %u\n",
2283 dev->name, index, dev->num_rx_queues);
2287 rxqueue = dev->_rx + index;
2291 if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
2295 goto got_hash; /* Skip hash computation on packet header */
2297 switch (skb->protocol) {
2298 case __constant_htons(ETH_P_IP):
2299 if (!pskb_may_pull(skb, sizeof(*ip)))
2302 ip = (struct iphdr *) skb->data;
2303 ip_proto = ip->protocol;
2304 addr1 = (__force u32) ip->saddr;
2305 addr2 = (__force u32) ip->daddr;
2308 case __constant_htons(ETH_P_IPV6):
2309 if (!pskb_may_pull(skb, sizeof(*ip6)))
2312 ip6 = (struct ipv6hdr *) skb->data;
2313 ip_proto = ip6->nexthdr;
2314 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2315 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2328 case IPPROTO_UDPLITE:
2329 if (pskb_may_pull(skb, (ihl * 4) + 4)) {
2330 ports.v32 = * (__force u32 *) (skb->data + (ihl * 4));
2331 if (ports.v16[1] < ports.v16[0])
2332 swap(ports.v16[0], ports.v16[1]);
2340 /* get a consistent hash (same value on both flow directions) */
2343 skb->rxhash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2348 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2349 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2350 if (flow_table && sock_flow_table) {
2352 struct rps_dev_flow *rflow;
2354 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2357 next_cpu = sock_flow_table->ents[skb->rxhash &
2358 sock_flow_table->mask];
2361 * If the desired CPU (where last recvmsg was done) is
2362 * different from current CPU (one in the rx-queue flow
2363 * table entry), switch if one of the following holds:
2364 * - Current CPU is unset (equal to RPS_NO_CPU).
2365 * - Current CPU is offline.
2366 * - The current CPU's queue tail has advanced beyond the
2367 * last packet that was enqueued using this table entry.
2368 * This guarantees that all previous packets for the flow
2369 * have been dequeued, thus preserving in order delivery.
2371 if (unlikely(tcpu != next_cpu) &&
2372 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2373 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2374 rflow->last_qtail)) >= 0)) {
2375 tcpu = rflow->cpu = next_cpu;
2376 if (tcpu != RPS_NO_CPU)
2377 rflow->last_qtail = per_cpu(softnet_data,
2378 tcpu).input_queue_head;
2380 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2387 map = rcu_dereference(rxqueue->rps_map);
2389 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2391 if (cpu_online(tcpu)) {
2401 /* Called from hardirq (IPI) context */
2402 static void rps_trigger_softirq(void *data)
2404 struct softnet_data *sd = data;
2406 ____napi_schedule(sd, &sd->backlog);
2410 #endif /* CONFIG_RPS */
2413 * Check if this softnet_data structure is another cpu one
2414 * If yes, queue it to our IPI list and return 1
2417 static int rps_ipi_queued(struct softnet_data *sd)
2420 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2423 sd->rps_ipi_next = mysd->rps_ipi_list;
2424 mysd->rps_ipi_list = sd;
2426 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2429 #endif /* CONFIG_RPS */
2434 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2435 * queue (may be a remote CPU queue).
2437 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2438 unsigned int *qtail)
2440 struct softnet_data *sd;
2441 unsigned long flags;
2443 sd = &per_cpu(softnet_data, cpu);
2445 local_irq_save(flags);
2448 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2449 if (skb_queue_len(&sd->input_pkt_queue)) {
2451 __skb_queue_tail(&sd->input_pkt_queue, skb);
2452 input_queue_tail_incr_save(sd, qtail);
2454 local_irq_restore(flags);
2455 return NET_RX_SUCCESS;
2458 /* Schedule NAPI for backlog device
2459 * We can use non atomic operation since we own the queue lock
2461 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2462 if (!rps_ipi_queued(sd))
2463 ____napi_schedule(sd, &sd->backlog);
2471 local_irq_restore(flags);
2478 * netif_rx - post buffer to the network code
2479 * @skb: buffer to post
2481 * This function receives a packet from a device driver and queues it for
2482 * the upper (protocol) levels to process. It always succeeds. The buffer
2483 * may be dropped during processing for congestion control or by the
2487 * NET_RX_SUCCESS (no congestion)
2488 * NET_RX_DROP (packet was dropped)
2492 int netif_rx(struct sk_buff *skb)
2496 /* if netpoll wants it, pretend we never saw it */
2497 if (netpoll_rx(skb))
2500 if (netdev_tstamp_prequeue)
2501 net_timestamp_check(skb);
2505 struct rps_dev_flow voidflow, *rflow = &voidflow;
2510 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2512 cpu = smp_processor_id();
2514 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2521 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2527 EXPORT_SYMBOL(netif_rx);
2529 int netif_rx_ni(struct sk_buff *skb)
2534 err = netif_rx(skb);
2535 if (local_softirq_pending())
2541 EXPORT_SYMBOL(netif_rx_ni);
2543 static void net_tx_action(struct softirq_action *h)
2545 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2547 if (sd->completion_queue) {
2548 struct sk_buff *clist;
2550 local_irq_disable();
2551 clist = sd->completion_queue;
2552 sd->completion_queue = NULL;
2556 struct sk_buff *skb = clist;
2557 clist = clist->next;
2559 WARN_ON(atomic_read(&skb->users));
2564 if (sd->output_queue) {
2567 local_irq_disable();
2568 head = sd->output_queue;
2569 sd->output_queue = NULL;
2570 sd->output_queue_tailp = &sd->output_queue;
2574 struct Qdisc *q = head;
2575 spinlock_t *root_lock;
2577 head = head->next_sched;
2579 root_lock = qdisc_lock(q);
2580 if (spin_trylock(root_lock)) {
2581 smp_mb__before_clear_bit();
2582 clear_bit(__QDISC_STATE_SCHED,
2585 spin_unlock(root_lock);
2587 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2589 __netif_reschedule(q);
2591 smp_mb__before_clear_bit();
2592 clear_bit(__QDISC_STATE_SCHED,
2600 static inline int deliver_skb(struct sk_buff *skb,
2601 struct packet_type *pt_prev,
2602 struct net_device *orig_dev)
2604 atomic_inc(&skb->users);
2605 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2608 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
2609 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
2610 /* This hook is defined here for ATM LANE */
2611 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2612 unsigned char *addr) __read_mostly;
2613 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2616 #ifdef CONFIG_NET_CLS_ACT
2617 /* TODO: Maybe we should just force sch_ingress to be compiled in
2618 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2619 * a compare and 2 stores extra right now if we dont have it on
2620 * but have CONFIG_NET_CLS_ACT
2621 * NOTE: This doesnt stop any functionality; if you dont have
2622 * the ingress scheduler, you just cant add policies on ingress.
2625 static int ing_filter(struct sk_buff *skb)
2627 struct net_device *dev = skb->dev;
2628 u32 ttl = G_TC_RTTL(skb->tc_verd);
2629 struct netdev_queue *rxq;
2630 int result = TC_ACT_OK;
2633 if (MAX_RED_LOOP < ttl++) {
2635 "Redir loop detected Dropping packet (%d->%d)\n",
2636 skb->skb_iif, dev->ifindex);
2640 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2641 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2643 rxq = &dev->rx_queue;
2646 if (q != &noop_qdisc) {
2647 spin_lock(qdisc_lock(q));
2648 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2649 result = qdisc_enqueue_root(skb, q);
2650 spin_unlock(qdisc_lock(q));
2656 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2657 struct packet_type **pt_prev,
2658 int *ret, struct net_device *orig_dev)
2660 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2664 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2668 switch (ing_filter(skb)) {
2682 * netif_nit_deliver - deliver received packets to network taps
2685 * This function is used to deliver incoming packets to network
2686 * taps. It should be used when the normal netif_receive_skb path
2687 * is bypassed, for example because of VLAN acceleration.
2689 void netif_nit_deliver(struct sk_buff *skb)
2691 struct packet_type *ptype;
2693 if (list_empty(&ptype_all))
2696 skb_reset_network_header(skb);
2697 skb_reset_transport_header(skb);
2698 skb->mac_len = skb->network_header - skb->mac_header;
2701 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2702 if (!ptype->dev || ptype->dev == skb->dev)
2703 deliver_skb(skb, ptype, skb->dev);
2709 * netdev_rx_handler_register - register receive handler
2710 * @dev: device to register a handler for
2711 * @rx_handler: receive handler to register
2713 * Register a receive hander for a device. This handler will then be
2714 * called from __netif_receive_skb. A negative errno code is returned
2717 * The caller must hold the rtnl_mutex.
2719 int netdev_rx_handler_register(struct net_device *dev,
2720 rx_handler_func_t *rx_handler)
2724 if (dev->rx_handler)
2727 rcu_assign_pointer(dev->rx_handler, rx_handler);
2731 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
2734 * netdev_rx_handler_unregister - unregister receive handler
2735 * @dev: device to unregister a handler from
2737 * Unregister a receive hander from a device.
2739 * The caller must hold the rtnl_mutex.
2741 void netdev_rx_handler_unregister(struct net_device *dev)
2745 rcu_assign_pointer(dev->rx_handler, NULL);
2747 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
2749 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2750 struct net_device *master)
2752 if (skb->pkt_type == PACKET_HOST) {
2753 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2755 memcpy(dest, master->dev_addr, ETH_ALEN);
2759 /* On bonding slaves other than the currently active slave, suppress
2760 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2761 * ARP on active-backup slaves with arp_validate enabled.
2763 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2765 struct net_device *dev = skb->dev;
2767 if (master->priv_flags & IFF_MASTER_ARPMON)
2768 dev->last_rx = jiffies;
2770 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
2771 /* Do address unmangle. The local destination address
2772 * will be always the one master has. Provides the right
2773 * functionality in a bridge.
2775 skb_bond_set_mac_by_master(skb, master);
2778 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2779 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2780 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2783 if (master->priv_flags & IFF_MASTER_ALB) {
2784 if (skb->pkt_type != PACKET_BROADCAST &&
2785 skb->pkt_type != PACKET_MULTICAST)
2788 if (master->priv_flags & IFF_MASTER_8023AD &&
2789 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2796 EXPORT_SYMBOL(__skb_bond_should_drop);
2798 static int __netif_receive_skb(struct sk_buff *skb)
2800 struct packet_type *ptype, *pt_prev;
2801 rx_handler_func_t *rx_handler;
2802 struct net_device *orig_dev;
2803 struct net_device *master;
2804 struct net_device *null_or_orig;
2805 struct net_device *orig_or_bond;
2806 int ret = NET_RX_DROP;
2809 if (!netdev_tstamp_prequeue)
2810 net_timestamp_check(skb);
2812 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2813 return NET_RX_SUCCESS;
2815 /* if we've gotten here through NAPI, check netpoll */
2816 if (netpoll_receive_skb(skb))
2820 skb->skb_iif = skb->dev->ifindex;
2822 null_or_orig = NULL;
2823 orig_dev = skb->dev;
2824 master = ACCESS_ONCE(orig_dev->master);
2826 if (skb_bond_should_drop(skb, master))
2827 null_or_orig = orig_dev; /* deliver only exact match */
2832 __this_cpu_inc(softnet_data.processed);
2833 skb_reset_network_header(skb);
2834 skb_reset_transport_header(skb);
2835 skb->mac_len = skb->network_header - skb->mac_header;
2841 #ifdef CONFIG_NET_CLS_ACT
2842 if (skb->tc_verd & TC_NCLS) {
2843 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2848 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2849 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2850 ptype->dev == orig_dev) {
2852 ret = deliver_skb(skb, pt_prev, orig_dev);
2857 #ifdef CONFIG_NET_CLS_ACT
2858 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2864 /* Handle special case of bridge or macvlan */
2865 rx_handler = rcu_dereference(skb->dev->rx_handler);
2868 ret = deliver_skb(skb, pt_prev, orig_dev);
2871 skb = rx_handler(skb);
2877 * Make sure frames received on VLAN interfaces stacked on
2878 * bonding interfaces still make their way to any base bonding
2879 * device that may have registered for a specific ptype. The
2880 * handler may have to adjust skb->dev and orig_dev.
2882 orig_or_bond = orig_dev;
2883 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2884 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2885 orig_or_bond = vlan_dev_real_dev(skb->dev);
2888 type = skb->protocol;
2889 list_for_each_entry_rcu(ptype,
2890 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2891 if (ptype->type == type && (ptype->dev == null_or_orig ||
2892 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2893 ptype->dev == orig_or_bond)) {
2895 ret = deliver_skb(skb, pt_prev, orig_dev);
2901 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2904 /* Jamal, now you will not able to escape explaining
2905 * me how you were going to use this. :-)
2916 * netif_receive_skb - process receive buffer from network
2917 * @skb: buffer to process
2919 * netif_receive_skb() is the main receive data processing function.
2920 * It always succeeds. The buffer may be dropped during processing
2921 * for congestion control or by the protocol layers.
2923 * This function may only be called from softirq context and interrupts
2924 * should be enabled.
2926 * Return values (usually ignored):
2927 * NET_RX_SUCCESS: no congestion
2928 * NET_RX_DROP: packet was dropped
2930 int netif_receive_skb(struct sk_buff *skb)
2932 if (netdev_tstamp_prequeue)
2933 net_timestamp_check(skb);
2937 struct rps_dev_flow voidflow, *rflow = &voidflow;
2942 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2945 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2949 ret = __netif_receive_skb(skb);
2955 return __netif_receive_skb(skb);
2958 EXPORT_SYMBOL(netif_receive_skb);
2960 /* Network device is going away, flush any packets still pending
2961 * Called with irqs disabled.
2963 static void flush_backlog(void *arg)
2965 struct net_device *dev = arg;
2966 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2967 struct sk_buff *skb, *tmp;
2970 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
2971 if (skb->dev == dev) {
2972 __skb_unlink(skb, &sd->input_pkt_queue);
2974 input_queue_head_incr(sd);
2979 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
2980 if (skb->dev == dev) {
2981 __skb_unlink(skb, &sd->process_queue);
2983 input_queue_head_incr(sd);
2988 static int napi_gro_complete(struct sk_buff *skb)
2990 struct packet_type *ptype;
2991 __be16 type = skb->protocol;
2992 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2995 if (NAPI_GRO_CB(skb)->count == 1) {
2996 skb_shinfo(skb)->gso_size = 0;
3001 list_for_each_entry_rcu(ptype, head, list) {
3002 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3005 err = ptype->gro_complete(skb);
3011 WARN_ON(&ptype->list == head);
3013 return NET_RX_SUCCESS;
3017 return netif_receive_skb(skb);
3020 static void napi_gro_flush(struct napi_struct *napi)
3022 struct sk_buff *skb, *next;
3024 for (skb = napi->gro_list; skb; skb = next) {
3027 napi_gro_complete(skb);
3030 napi->gro_count = 0;
3031 napi->gro_list = NULL;
3034 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3036 struct sk_buff **pp = NULL;
3037 struct packet_type *ptype;
3038 __be16 type = skb->protocol;
3039 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3042 enum gro_result ret;
3044 if (!(skb->dev->features & NETIF_F_GRO))
3047 if (skb_is_gso(skb) || skb_has_frags(skb))
3051 list_for_each_entry_rcu(ptype, head, list) {
3052 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3055 skb_set_network_header(skb, skb_gro_offset(skb));
3056 mac_len = skb->network_header - skb->mac_header;
3057 skb->mac_len = mac_len;
3058 NAPI_GRO_CB(skb)->same_flow = 0;
3059 NAPI_GRO_CB(skb)->flush = 0;
3060 NAPI_GRO_CB(skb)->free = 0;
3062 pp = ptype->gro_receive(&napi->gro_list, skb);
3067 if (&ptype->list == head)
3070 same_flow = NAPI_GRO_CB(skb)->same_flow;
3071 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3074 struct sk_buff *nskb = *pp;
3078 napi_gro_complete(nskb);
3085 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3089 NAPI_GRO_CB(skb)->count = 1;
3090 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3091 skb->next = napi->gro_list;
3092 napi->gro_list = skb;
3096 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3097 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3099 BUG_ON(skb->end - skb->tail < grow);
3101 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3104 skb->data_len -= grow;
3106 skb_shinfo(skb)->frags[0].page_offset += grow;
3107 skb_shinfo(skb)->frags[0].size -= grow;
3109 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3110 put_page(skb_shinfo(skb)->frags[0].page);
3111 memmove(skb_shinfo(skb)->frags,
3112 skb_shinfo(skb)->frags + 1,
3113 --skb_shinfo(skb)->nr_frags);
3124 EXPORT_SYMBOL(dev_gro_receive);
3127 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3131 if (netpoll_rx_on(skb))
3134 for (p = napi->gro_list; p; p = p->next) {
3135 NAPI_GRO_CB(p)->same_flow =
3136 (p->dev == skb->dev) &&
3137 !compare_ether_header(skb_mac_header(p),
3138 skb_gro_mac_header(skb));
3139 NAPI_GRO_CB(p)->flush = 0;
3142 return dev_gro_receive(napi, skb);
3145 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3149 if (netif_receive_skb(skb))
3154 case GRO_MERGED_FREE:
3165 EXPORT_SYMBOL(napi_skb_finish);
3167 void skb_gro_reset_offset(struct sk_buff *skb)
3169 NAPI_GRO_CB(skb)->data_offset = 0;
3170 NAPI_GRO_CB(skb)->frag0 = NULL;
3171 NAPI_GRO_CB(skb)->frag0_len = 0;
3173 if (skb->mac_header == skb->tail &&
3174 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3175 NAPI_GRO_CB(skb)->frag0 =
3176 page_address(skb_shinfo(skb)->frags[0].page) +
3177 skb_shinfo(skb)->frags[0].page_offset;
3178 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3181 EXPORT_SYMBOL(skb_gro_reset_offset);
3183 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3185 skb_gro_reset_offset(skb);
3187 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3189 EXPORT_SYMBOL(napi_gro_receive);
3191 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3193 __skb_pull(skb, skb_headlen(skb));
3194 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3198 EXPORT_SYMBOL(napi_reuse_skb);
3200 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3202 struct sk_buff *skb = napi->skb;
3205 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3211 EXPORT_SYMBOL(napi_get_frags);
3213 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3219 skb->protocol = eth_type_trans(skb, skb->dev);
3221 if (ret == GRO_HELD)
3222 skb_gro_pull(skb, -ETH_HLEN);
3223 else if (netif_receive_skb(skb))
3228 case GRO_MERGED_FREE:
3229 napi_reuse_skb(napi, skb);
3238 EXPORT_SYMBOL(napi_frags_finish);
3240 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3242 struct sk_buff *skb = napi->skb;
3249 skb_reset_mac_header(skb);
3250 skb_gro_reset_offset(skb);
3252 off = skb_gro_offset(skb);
3253 hlen = off + sizeof(*eth);
3254 eth = skb_gro_header_fast(skb, off);
3255 if (skb_gro_header_hard(skb, hlen)) {
3256 eth = skb_gro_header_slow(skb, hlen, off);
3257 if (unlikely(!eth)) {
3258 napi_reuse_skb(napi, skb);
3264 skb_gro_pull(skb, sizeof(*eth));
3267 * This works because the only protocols we care about don't require
3268 * special handling. We'll fix it up properly at the end.
3270 skb->protocol = eth->h_proto;
3275 EXPORT_SYMBOL(napi_frags_skb);
3277 gro_result_t napi_gro_frags(struct napi_struct *napi)
3279 struct sk_buff *skb = napi_frags_skb(napi);
3284 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3286 EXPORT_SYMBOL(napi_gro_frags);
3289 * net_rps_action sends any pending IPI's for rps.
3290 * Note: called with local irq disabled, but exits with local irq enabled.
3292 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3295 struct softnet_data *remsd = sd->rps_ipi_list;
3298 sd->rps_ipi_list = NULL;
3302 /* Send pending IPI's to kick RPS processing on remote cpus. */
3304 struct softnet_data *next = remsd->rps_ipi_next;
3306 if (cpu_online(remsd->cpu))
3307 __smp_call_function_single(remsd->cpu,
3316 static int process_backlog(struct napi_struct *napi, int quota)
3319 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3322 /* Check if we have pending ipi, its better to send them now,
3323 * not waiting net_rx_action() end.
3325 if (sd->rps_ipi_list) {
3326 local_irq_disable();
3327 net_rps_action_and_irq_enable(sd);
3330 napi->weight = weight_p;
3331 local_irq_disable();
3332 while (work < quota) {
3333 struct sk_buff *skb;
3336 while ((skb = __skb_dequeue(&sd->process_queue))) {
3338 __netif_receive_skb(skb);
3339 local_irq_disable();
3340 input_queue_head_incr(sd);
3341 if (++work >= quota) {
3348 qlen = skb_queue_len(&sd->input_pkt_queue);
3350 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3351 &sd->process_queue);
3353 if (qlen < quota - work) {
3355 * Inline a custom version of __napi_complete().
3356 * only current cpu owns and manipulates this napi,
3357 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3358 * we can use a plain write instead of clear_bit(),
3359 * and we dont need an smp_mb() memory barrier.
3361 list_del(&napi->poll_list);
3364 quota = work + qlen;
3374 * __napi_schedule - schedule for receive
3375 * @n: entry to schedule
3377 * The entry's receive function will be scheduled to run
3379 void __napi_schedule(struct napi_struct *n)
3381 unsigned long flags;
3383 local_irq_save(flags);
3384 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3385 local_irq_restore(flags);
3387 EXPORT_SYMBOL(__napi_schedule);
3389 void __napi_complete(struct napi_struct *n)
3391 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3392 BUG_ON(n->gro_list);
3394 list_del(&n->poll_list);
3395 smp_mb__before_clear_bit();
3396 clear_bit(NAPI_STATE_SCHED, &n->state);
3398 EXPORT_SYMBOL(__napi_complete);
3400 void napi_complete(struct napi_struct *n)
3402 unsigned long flags;
3405 * don't let napi dequeue from the cpu poll list
3406 * just in case its running on a different cpu
3408 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3412 local_irq_save(flags);
3414 local_irq_restore(flags);
3416 EXPORT_SYMBOL(napi_complete);
3418 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3419 int (*poll)(struct napi_struct *, int), int weight)
3421 INIT_LIST_HEAD(&napi->poll_list);
3422 napi->gro_count = 0;
3423 napi->gro_list = NULL;
3426 napi->weight = weight;
3427 list_add(&napi->dev_list, &dev->napi_list);
3429 #ifdef CONFIG_NETPOLL
3430 spin_lock_init(&napi->poll_lock);
3431 napi->poll_owner = -1;
3433 set_bit(NAPI_STATE_SCHED, &napi->state);
3435 EXPORT_SYMBOL(netif_napi_add);
3437 void netif_napi_del(struct napi_struct *napi)
3439 struct sk_buff *skb, *next;
3441 list_del_init(&napi->dev_list);
3442 napi_free_frags(napi);
3444 for (skb = napi->gro_list; skb; skb = next) {
3450 napi->gro_list = NULL;
3451 napi->gro_count = 0;
3453 EXPORT_SYMBOL(netif_napi_del);
3455 static void net_rx_action(struct softirq_action *h)
3457 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3458 unsigned long time_limit = jiffies + 2;
3459 int budget = netdev_budget;
3462 local_irq_disable();
3464 while (!list_empty(&sd->poll_list)) {
3465 struct napi_struct *n;
3468 /* If softirq window is exhuasted then punt.
3469 * Allow this to run for 2 jiffies since which will allow
3470 * an average latency of 1.5/HZ.
3472 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3477 /* Even though interrupts have been re-enabled, this
3478 * access is safe because interrupts can only add new
3479 * entries to the tail of this list, and only ->poll()
3480 * calls can remove this head entry from the list.
3482 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3484 have = netpoll_poll_lock(n);
3488 /* This NAPI_STATE_SCHED test is for avoiding a race
3489 * with netpoll's poll_napi(). Only the entity which
3490 * obtains the lock and sees NAPI_STATE_SCHED set will
3491 * actually make the ->poll() call. Therefore we avoid
3492 * accidently calling ->poll() when NAPI is not scheduled.
3495 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3496 work = n->poll(n, weight);
3500 WARN_ON_ONCE(work > weight);
3504 local_irq_disable();
3506 /* Drivers must not modify the NAPI state if they
3507 * consume the entire weight. In such cases this code
3508 * still "owns" the NAPI instance and therefore can
3509 * move the instance around on the list at-will.
3511 if (unlikely(work == weight)) {
3512 if (unlikely(napi_disable_pending(n))) {
3515 local_irq_disable();
3517 list_move_tail(&n->poll_list, &sd->poll_list);
3520 netpoll_poll_unlock(have);
3523 net_rps_action_and_irq_enable(sd);
3525 #ifdef CONFIG_NET_DMA
3527 * There may not be any more sk_buffs coming right now, so push
3528 * any pending DMA copies to hardware
3530 dma_issue_pending_all();
3537 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3541 static gifconf_func_t *gifconf_list[NPROTO];
3544 * register_gifconf - register a SIOCGIF handler
3545 * @family: Address family
3546 * @gifconf: Function handler
3548 * Register protocol dependent address dumping routines. The handler
3549 * that is passed must not be freed or reused until it has been replaced
3550 * by another handler.
3552 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3554 if (family >= NPROTO)
3556 gifconf_list[family] = gifconf;
3559 EXPORT_SYMBOL(register_gifconf);
3563 * Map an interface index to its name (SIOCGIFNAME)
3567 * We need this ioctl for efficient implementation of the
3568 * if_indextoname() function required by the IPv6 API. Without
3569 * it, we would have to search all the interfaces to find a
3573 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3575 struct net_device *dev;
3579 * Fetch the caller's info block.
3582 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3586 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3592 strcpy(ifr.ifr_name, dev->name);
3595 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3601 * Perform a SIOCGIFCONF call. This structure will change
3602 * size eventually, and there is nothing I can do about it.
3603 * Thus we will need a 'compatibility mode'.
3606 static int dev_ifconf(struct net *net, char __user *arg)
3609 struct net_device *dev;
3616 * Fetch the caller's info block.
3619 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3626 * Loop over the interfaces, and write an info block for each.
3630 for_each_netdev(net, dev) {
3631 for (i = 0; i < NPROTO; i++) {
3632 if (gifconf_list[i]) {
3635 done = gifconf_list[i](dev, NULL, 0);
3637 done = gifconf_list[i](dev, pos + total,
3647 * All done. Write the updated control block back to the caller.
3649 ifc.ifc_len = total;
3652 * Both BSD and Solaris return 0 here, so we do too.
3654 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3657 #ifdef CONFIG_PROC_FS
3659 * This is invoked by the /proc filesystem handler to display a device
3662 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3665 struct net *net = seq_file_net(seq);
3667 struct net_device *dev;
3671 return SEQ_START_TOKEN;
3674 for_each_netdev_rcu(net, dev)
3681 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3683 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3684 first_net_device(seq_file_net(seq)) :
3685 next_net_device((struct net_device *)v);
3688 return rcu_dereference(dev);
3691 void dev_seq_stop(struct seq_file *seq, void *v)
3697 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3699 const struct net_device_stats *stats = dev_get_stats(dev);
3701 seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3702 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3703 dev->name, stats->rx_bytes, stats->rx_packets,
3705 stats->rx_dropped + stats->rx_missed_errors,
3706 stats->rx_fifo_errors,
3707 stats->rx_length_errors + stats->rx_over_errors +
3708 stats->rx_crc_errors + stats->rx_frame_errors,
3709 stats->rx_compressed, stats->multicast,
3710 stats->tx_bytes, stats->tx_packets,
3711 stats->tx_errors, stats->tx_dropped,
3712 stats->tx_fifo_errors, stats->collisions,
3713 stats->tx_carrier_errors +
3714 stats->tx_aborted_errors +
3715 stats->tx_window_errors +
3716 stats->tx_heartbeat_errors,
3717 stats->tx_compressed);
3721 * Called from the PROCfs module. This now uses the new arbitrary sized
3722 * /proc/net interface to create /proc/net/dev
3724 static int dev_seq_show(struct seq_file *seq, void *v)
3726 if (v == SEQ_START_TOKEN)
3727 seq_puts(seq, "Inter-| Receive "
3729 " face |bytes packets errs drop fifo frame "
3730 "compressed multicast|bytes packets errs "
3731 "drop fifo colls carrier compressed\n");
3733 dev_seq_printf_stats(seq, v);
3737 static struct softnet_data *softnet_get_online(loff_t *pos)
3739 struct softnet_data *sd = NULL;
3741 while (*pos < nr_cpu_ids)
3742 if (cpu_online(*pos)) {
3743 sd = &per_cpu(softnet_data, *pos);
3750 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3752 return softnet_get_online(pos);
3755 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3758 return softnet_get_online(pos);
3761 static void softnet_seq_stop(struct seq_file *seq, void *v)
3765 static int softnet_seq_show(struct seq_file *seq, void *v)
3767 struct softnet_data *sd = v;
3769 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3770 sd->processed, sd->dropped, sd->time_squeeze, 0,
3771 0, 0, 0, 0, /* was fastroute */
3772 sd->cpu_collision, sd->received_rps);
3776 static const struct seq_operations dev_seq_ops = {
3777 .start = dev_seq_start,
3778 .next = dev_seq_next,
3779 .stop = dev_seq_stop,
3780 .show = dev_seq_show,
3783 static int dev_seq_open(struct inode *inode, struct file *file)
3785 return seq_open_net(inode, file, &dev_seq_ops,
3786 sizeof(struct seq_net_private));
3789 static const struct file_operations dev_seq_fops = {
3790 .owner = THIS_MODULE,
3791 .open = dev_seq_open,
3793 .llseek = seq_lseek,
3794 .release = seq_release_net,
3797 static const struct seq_operations softnet_seq_ops = {
3798 .start = softnet_seq_start,
3799 .next = softnet_seq_next,
3800 .stop = softnet_seq_stop,
3801 .show = softnet_seq_show,
3804 static int softnet_seq_open(struct inode *inode, struct file *file)
3806 return seq_open(file, &softnet_seq_ops);
3809 static const struct file_operations softnet_seq_fops = {
3810 .owner = THIS_MODULE,
3811 .open = softnet_seq_open,
3813 .llseek = seq_lseek,
3814 .release = seq_release,
3817 static void *ptype_get_idx(loff_t pos)
3819 struct packet_type *pt = NULL;
3823 list_for_each_entry_rcu(pt, &ptype_all, list) {
3829 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3830 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3839 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3843 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3846 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3848 struct packet_type *pt;
3849 struct list_head *nxt;
3853 if (v == SEQ_START_TOKEN)
3854 return ptype_get_idx(0);
3857 nxt = pt->list.next;
3858 if (pt->type == htons(ETH_P_ALL)) {
3859 if (nxt != &ptype_all)
3862 nxt = ptype_base[0].next;
3864 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3866 while (nxt == &ptype_base[hash]) {
3867 if (++hash >= PTYPE_HASH_SIZE)
3869 nxt = ptype_base[hash].next;
3872 return list_entry(nxt, struct packet_type, list);
3875 static void ptype_seq_stop(struct seq_file *seq, void *v)
3881 static int ptype_seq_show(struct seq_file *seq, void *v)
3883 struct packet_type *pt = v;
3885 if (v == SEQ_START_TOKEN)
3886 seq_puts(seq, "Type Device Function\n");
3887 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3888 if (pt->type == htons(ETH_P_ALL))
3889 seq_puts(seq, "ALL ");
3891 seq_printf(seq, "%04x", ntohs(pt->type));
3893 seq_printf(seq, " %-8s %pF\n",
3894 pt->dev ? pt->dev->name : "", pt->func);
3900 static const struct seq_operations ptype_seq_ops = {
3901 .start = ptype_seq_start,
3902 .next = ptype_seq_next,
3903 .stop = ptype_seq_stop,
3904 .show = ptype_seq_show,
3907 static int ptype_seq_open(struct inode *inode, struct file *file)
3909 return seq_open_net(inode, file, &ptype_seq_ops,
3910 sizeof(struct seq_net_private));
3913 static const struct file_operations ptype_seq_fops = {
3914 .owner = THIS_MODULE,
3915 .open = ptype_seq_open,
3917 .llseek = seq_lseek,
3918 .release = seq_release_net,
3922 static int __net_init dev_proc_net_init(struct net *net)
3926 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3928 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3930 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3933 if (wext_proc_init(net))
3939 proc_net_remove(net, "ptype");
3941 proc_net_remove(net, "softnet_stat");
3943 proc_net_remove(net, "dev");
3947 static void __net_exit dev_proc_net_exit(struct net *net)
3949 wext_proc_exit(net);
3951 proc_net_remove(net, "ptype");
3952 proc_net_remove(net, "softnet_stat");
3953 proc_net_remove(net, "dev");
3956 static struct pernet_operations __net_initdata dev_proc_ops = {
3957 .init = dev_proc_net_init,
3958 .exit = dev_proc_net_exit,
3961 static int __init dev_proc_init(void)
3963 return register_pernet_subsys(&dev_proc_ops);
3966 #define dev_proc_init() 0
3967 #endif /* CONFIG_PROC_FS */
3971 * netdev_set_master - set up master/slave pair
3972 * @slave: slave device
3973 * @master: new master device
3975 * Changes the master device of the slave. Pass %NULL to break the
3976 * bonding. The caller must hold the RTNL semaphore. On a failure
3977 * a negative errno code is returned. On success the reference counts
3978 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3979 * function returns zero.
3981 int netdev_set_master(struct net_device *slave, struct net_device *master)
3983 struct net_device *old = slave->master;
3993 slave->master = master;
4000 slave->flags |= IFF_SLAVE;
4002 slave->flags &= ~IFF_SLAVE;
4004 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4007 EXPORT_SYMBOL(netdev_set_master);
4009 static void dev_change_rx_flags(struct net_device *dev, int flags)
4011 const struct net_device_ops *ops = dev->netdev_ops;
4013 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4014 ops->ndo_change_rx_flags(dev, flags);
4017 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4019 unsigned short old_flags = dev->flags;
4025 dev->flags |= IFF_PROMISC;
4026 dev->promiscuity += inc;
4027 if (dev->promiscuity == 0) {
4030 * If inc causes overflow, untouch promisc and return error.
4033 dev->flags &= ~IFF_PROMISC;
4035 dev->promiscuity -= inc;
4036 printk(KERN_WARNING "%s: promiscuity touches roof, "
4037 "set promiscuity failed, promiscuity feature "
4038 "of device might be broken.\n", dev->name);
4042 if (dev->flags != old_flags) {
4043 printk(KERN_INFO "device %s %s promiscuous mode\n",
4044 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4046 if (audit_enabled) {
4047 current_uid_gid(&uid, &gid);
4048 audit_log(current->audit_context, GFP_ATOMIC,
4049 AUDIT_ANOM_PROMISCUOUS,
4050 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4051 dev->name, (dev->flags & IFF_PROMISC),
4052 (old_flags & IFF_PROMISC),
4053 audit_get_loginuid(current),
4055 audit_get_sessionid(current));
4058 dev_change_rx_flags(dev, IFF_PROMISC);
4064 * dev_set_promiscuity - update promiscuity count on a device
4068 * Add or remove promiscuity from a device. While the count in the device
4069 * remains above zero the interface remains promiscuous. Once it hits zero
4070 * the device reverts back to normal filtering operation. A negative inc
4071 * value is used to drop promiscuity on the device.
4072 * Return 0 if successful or a negative errno code on error.
4074 int dev_set_promiscuity(struct net_device *dev, int inc)
4076 unsigned short old_flags = dev->flags;
4079 err = __dev_set_promiscuity(dev, inc);
4082 if (dev->flags != old_flags)
4083 dev_set_rx_mode(dev);
4086 EXPORT_SYMBOL(dev_set_promiscuity);
4089 * dev_set_allmulti - update allmulti count on a device
4093 * Add or remove reception of all multicast frames to a device. While the
4094 * count in the device remains above zero the interface remains listening
4095 * to all interfaces. Once it hits zero the device reverts back to normal
4096 * filtering operation. A negative @inc value is used to drop the counter
4097 * when releasing a resource needing all multicasts.
4098 * Return 0 if successful or a negative errno code on error.
4101 int dev_set_allmulti(struct net_device *dev, int inc)
4103 unsigned short old_flags = dev->flags;
4107 dev->flags |= IFF_ALLMULTI;
4108 dev->allmulti += inc;
4109 if (dev->allmulti == 0) {
4112 * If inc causes overflow, untouch allmulti and return error.
4115 dev->flags &= ~IFF_ALLMULTI;
4117 dev->allmulti -= inc;
4118 printk(KERN_WARNING "%s: allmulti touches roof, "
4119 "set allmulti failed, allmulti feature of "
4120 "device might be broken.\n", dev->name);
4124 if (dev->flags ^ old_flags) {
4125 dev_change_rx_flags(dev, IFF_ALLMULTI);
4126 dev_set_rx_mode(dev);
4130 EXPORT_SYMBOL(dev_set_allmulti);
4133 * Upload unicast and multicast address lists to device and
4134 * configure RX filtering. When the device doesn't support unicast
4135 * filtering it is put in promiscuous mode while unicast addresses
4138 void __dev_set_rx_mode(struct net_device *dev)
4140 const struct net_device_ops *ops = dev->netdev_ops;
4142 /* dev_open will call this function so the list will stay sane. */
4143 if (!(dev->flags&IFF_UP))
4146 if (!netif_device_present(dev))
4149 if (ops->ndo_set_rx_mode)
4150 ops->ndo_set_rx_mode(dev);
4152 /* Unicast addresses changes may only happen under the rtnl,
4153 * therefore calling __dev_set_promiscuity here is safe.
4155 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4156 __dev_set_promiscuity(dev, 1);
4157 dev->uc_promisc = 1;
4158 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4159 __dev_set_promiscuity(dev, -1);
4160 dev->uc_promisc = 0;
4163 if (ops->ndo_set_multicast_list)
4164 ops->ndo_set_multicast_list(dev);
4168 void dev_set_rx_mode(struct net_device *dev)
4170 netif_addr_lock_bh(dev);
4171 __dev_set_rx_mode(dev);
4172 netif_addr_unlock_bh(dev);
4176 * dev_get_flags - get flags reported to userspace
4179 * Get the combination of flag bits exported through APIs to userspace.
4181 unsigned dev_get_flags(const struct net_device *dev)
4185 flags = (dev->flags & ~(IFF_PROMISC |
4190 (dev->gflags & (IFF_PROMISC |
4193 if (netif_running(dev)) {
4194 if (netif_oper_up(dev))
4195 flags |= IFF_RUNNING;
4196 if (netif_carrier_ok(dev))
4197 flags |= IFF_LOWER_UP;
4198 if (netif_dormant(dev))
4199 flags |= IFF_DORMANT;
4204 EXPORT_SYMBOL(dev_get_flags);
4206 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4208 int old_flags = dev->flags;
4214 * Set the flags on our device.
4217 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4218 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4220 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4224 * Load in the correct multicast list now the flags have changed.
4227 if ((old_flags ^ flags) & IFF_MULTICAST)
4228 dev_change_rx_flags(dev, IFF_MULTICAST);
4230 dev_set_rx_mode(dev);
4233 * Have we downed the interface. We handle IFF_UP ourselves
4234 * according to user attempts to set it, rather than blindly
4239 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4240 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4243 dev_set_rx_mode(dev);
4246 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4247 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4249 dev->gflags ^= IFF_PROMISC;
4250 dev_set_promiscuity(dev, inc);
4253 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4254 is important. Some (broken) drivers set IFF_PROMISC, when
4255 IFF_ALLMULTI is requested not asking us and not reporting.
4257 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4258 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4260 dev->gflags ^= IFF_ALLMULTI;
4261 dev_set_allmulti(dev, inc);
4267 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4269 unsigned int changes = dev->flags ^ old_flags;
4271 if (changes & IFF_UP) {
4272 if (dev->flags & IFF_UP)
4273 call_netdevice_notifiers(NETDEV_UP, dev);
4275 call_netdevice_notifiers(NETDEV_DOWN, dev);
4278 if (dev->flags & IFF_UP &&
4279 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4280 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4284 * dev_change_flags - change device settings
4286 * @flags: device state flags
4288 * Change settings on device based state flags. The flags are
4289 * in the userspace exported format.
4291 int dev_change_flags(struct net_device *dev, unsigned flags)
4294 int old_flags = dev->flags;
4296 ret = __dev_change_flags(dev, flags);
4300 changes = old_flags ^ dev->flags;
4302 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4304 __dev_notify_flags(dev, old_flags);
4307 EXPORT_SYMBOL(dev_change_flags);
4310 * dev_set_mtu - Change maximum transfer unit
4312 * @new_mtu: new transfer unit
4314 * Change the maximum transfer size of the network device.
4316 int dev_set_mtu(struct net_device *dev, int new_mtu)
4318 const struct net_device_ops *ops = dev->netdev_ops;
4321 if (new_mtu == dev->mtu)
4324 /* MTU must be positive. */
4328 if (!netif_device_present(dev))
4332 if (ops->ndo_change_mtu)
4333 err = ops->ndo_change_mtu(dev, new_mtu);
4337 if (!err && dev->flags & IFF_UP)
4338 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4341 EXPORT_SYMBOL(dev_set_mtu);
4344 * dev_set_mac_address - Change Media Access Control Address
4348 * Change the hardware (MAC) address of the device
4350 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4352 const struct net_device_ops *ops = dev->netdev_ops;
4355 if (!ops->ndo_set_mac_address)
4357 if (sa->sa_family != dev->type)
4359 if (!netif_device_present(dev))
4361 err = ops->ndo_set_mac_address(dev, sa);
4363 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4366 EXPORT_SYMBOL(dev_set_mac_address);
4369 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4371 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4374 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4380 case SIOCGIFFLAGS: /* Get interface flags */
4381 ifr->ifr_flags = (short) dev_get_flags(dev);
4384 case SIOCGIFMETRIC: /* Get the metric on the interface
4385 (currently unused) */
4386 ifr->ifr_metric = 0;
4389 case SIOCGIFMTU: /* Get the MTU of a device */
4390 ifr->ifr_mtu = dev->mtu;
4395 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4397 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4398 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4399 ifr->ifr_hwaddr.sa_family = dev->type;
4407 ifr->ifr_map.mem_start = dev->mem_start;
4408 ifr->ifr_map.mem_end = dev->mem_end;
4409 ifr->ifr_map.base_addr = dev->base_addr;
4410 ifr->ifr_map.irq = dev->irq;
4411 ifr->ifr_map.dma = dev->dma;
4412 ifr->ifr_map.port = dev->if_port;
4416 ifr->ifr_ifindex = dev->ifindex;
4420 ifr->ifr_qlen = dev->tx_queue_len;
4424 /* dev_ioctl() should ensure this case
4436 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4438 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4441 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4442 const struct net_device_ops *ops;
4447 ops = dev->netdev_ops;
4450 case SIOCSIFFLAGS: /* Set interface flags */
4451 return dev_change_flags(dev, ifr->ifr_flags);
4453 case SIOCSIFMETRIC: /* Set the metric on the interface
4454 (currently unused) */
4457 case SIOCSIFMTU: /* Set the MTU of a device */
4458 return dev_set_mtu(dev, ifr->ifr_mtu);
4461 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4463 case SIOCSIFHWBROADCAST:
4464 if (ifr->ifr_hwaddr.sa_family != dev->type)
4466 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4467 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4468 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4472 if (ops->ndo_set_config) {
4473 if (!netif_device_present(dev))
4475 return ops->ndo_set_config(dev, &ifr->ifr_map);
4480 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4481 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4483 if (!netif_device_present(dev))
4485 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4488 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4489 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4491 if (!netif_device_present(dev))
4493 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4496 if (ifr->ifr_qlen < 0)
4498 dev->tx_queue_len = ifr->ifr_qlen;
4502 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4503 return dev_change_name(dev, ifr->ifr_newname);
4506 * Unknown or private ioctl
4509 if ((cmd >= SIOCDEVPRIVATE &&
4510 cmd <= SIOCDEVPRIVATE + 15) ||
4511 cmd == SIOCBONDENSLAVE ||
4512 cmd == SIOCBONDRELEASE ||
4513 cmd == SIOCBONDSETHWADDR ||
4514 cmd == SIOCBONDSLAVEINFOQUERY ||
4515 cmd == SIOCBONDINFOQUERY ||
4516 cmd == SIOCBONDCHANGEACTIVE ||
4517 cmd == SIOCGMIIPHY ||
4518 cmd == SIOCGMIIREG ||
4519 cmd == SIOCSMIIREG ||
4520 cmd == SIOCBRADDIF ||
4521 cmd == SIOCBRDELIF ||
4522 cmd == SIOCSHWTSTAMP ||
4523 cmd == SIOCWANDEV) {
4525 if (ops->ndo_do_ioctl) {
4526 if (netif_device_present(dev))
4527 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4539 * This function handles all "interface"-type I/O control requests. The actual
4540 * 'doing' part of this is dev_ifsioc above.
4544 * dev_ioctl - network device ioctl
4545 * @net: the applicable net namespace
4546 * @cmd: command to issue
4547 * @arg: pointer to a struct ifreq in user space
4549 * Issue ioctl functions to devices. This is normally called by the
4550 * user space syscall interfaces but can sometimes be useful for
4551 * other purposes. The return value is the return from the syscall if
4552 * positive or a negative errno code on error.
4555 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4561 /* One special case: SIOCGIFCONF takes ifconf argument
4562 and requires shared lock, because it sleeps writing
4566 if (cmd == SIOCGIFCONF) {
4568 ret = dev_ifconf(net, (char __user *) arg);
4572 if (cmd == SIOCGIFNAME)
4573 return dev_ifname(net, (struct ifreq __user *)arg);
4575 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4578 ifr.ifr_name[IFNAMSIZ-1] = 0;
4580 colon = strchr(ifr.ifr_name, ':');
4585 * See which interface the caller is talking about.
4590 * These ioctl calls:
4591 * - can be done by all.
4592 * - atomic and do not require locking.
4603 dev_load(net, ifr.ifr_name);
4605 ret = dev_ifsioc_locked(net, &ifr, cmd);
4610 if (copy_to_user(arg, &ifr,
4611 sizeof(struct ifreq)))
4617 dev_load(net, ifr.ifr_name);
4619 ret = dev_ethtool(net, &ifr);
4624 if (copy_to_user(arg, &ifr,
4625 sizeof(struct ifreq)))
4631 * These ioctl calls:
4632 * - require superuser power.
4633 * - require strict serialization.
4639 if (!capable(CAP_NET_ADMIN))
4641 dev_load(net, ifr.ifr_name);
4643 ret = dev_ifsioc(net, &ifr, cmd);
4648 if (copy_to_user(arg, &ifr,
4649 sizeof(struct ifreq)))
4655 * These ioctl calls:
4656 * - require superuser power.
4657 * - require strict serialization.
4658 * - do not return a value
4668 case SIOCSIFHWBROADCAST:
4671 case SIOCBONDENSLAVE:
4672 case SIOCBONDRELEASE:
4673 case SIOCBONDSETHWADDR:
4674 case SIOCBONDCHANGEACTIVE:
4678 if (!capable(CAP_NET_ADMIN))
4681 case SIOCBONDSLAVEINFOQUERY:
4682 case SIOCBONDINFOQUERY:
4683 dev_load(net, ifr.ifr_name);
4685 ret = dev_ifsioc(net, &ifr, cmd);
4690 /* Get the per device memory space. We can add this but
4691 * currently do not support it */
4693 /* Set the per device memory buffer space.
4694 * Not applicable in our case */
4699 * Unknown or private ioctl.
4702 if (cmd == SIOCWANDEV ||
4703 (cmd >= SIOCDEVPRIVATE &&
4704 cmd <= SIOCDEVPRIVATE + 15)) {
4705 dev_load(net, ifr.ifr_name);
4707 ret = dev_ifsioc(net, &ifr, cmd);
4709 if (!ret && copy_to_user(arg, &ifr,
4710 sizeof(struct ifreq)))
4714 /* Take care of Wireless Extensions */
4715 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4716 return wext_handle_ioctl(net, &ifr, cmd, arg);
4723 * dev_new_index - allocate an ifindex
4724 * @net: the applicable net namespace
4726 * Returns a suitable unique value for a new device interface
4727 * number. The caller must hold the rtnl semaphore or the
4728 * dev_base_lock to be sure it remains unique.
4730 static int dev_new_index(struct net *net)
4736 if (!__dev_get_by_index(net, ifindex))
4741 /* Delayed registration/unregisteration */
4742 static LIST_HEAD(net_todo_list);
4744 static void net_set_todo(struct net_device *dev)
4746 list_add_tail(&dev->todo_list, &net_todo_list);
4749 static void rollback_registered_many(struct list_head *head)
4751 struct net_device *dev, *tmp;
4753 BUG_ON(dev_boot_phase);
4756 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4757 /* Some devices call without registering
4758 * for initialization unwind. Remove those
4759 * devices and proceed with the remaining.
4761 if (dev->reg_state == NETREG_UNINITIALIZED) {
4762 pr_debug("unregister_netdevice: device %s/%p never "
4763 "was registered\n", dev->name, dev);
4766 list_del(&dev->unreg_list);
4770 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4772 /* If device is running, close it first. */
4775 /* And unlink it from device chain. */
4776 unlist_netdevice(dev);
4778 dev->reg_state = NETREG_UNREGISTERING;
4783 list_for_each_entry(dev, head, unreg_list) {
4784 /* Shutdown queueing discipline. */
4788 /* Notify protocols, that we are about to destroy
4789 this device. They should clean all the things.
4791 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4793 if (!dev->rtnl_link_ops ||
4794 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4795 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4798 * Flush the unicast and multicast chains
4803 if (dev->netdev_ops->ndo_uninit)
4804 dev->netdev_ops->ndo_uninit(dev);
4806 /* Notifier chain MUST detach us from master device. */
4807 WARN_ON(dev->master);
4809 /* Remove entries from kobject tree */
4810 netdev_unregister_kobject(dev);
4813 /* Process any work delayed until the end of the batch */
4814 dev = list_first_entry(head, struct net_device, unreg_list);
4815 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4819 list_for_each_entry(dev, head, unreg_list)
4823 static void rollback_registered(struct net_device *dev)
4827 list_add(&dev->unreg_list, &single);
4828 rollback_registered_many(&single);
4831 static void __netdev_init_queue_locks_one(struct net_device *dev,
4832 struct netdev_queue *dev_queue,
4835 spin_lock_init(&dev_queue->_xmit_lock);
4836 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4837 dev_queue->xmit_lock_owner = -1;
4840 static void netdev_init_queue_locks(struct net_device *dev)
4842 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4843 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4846 unsigned long netdev_fix_features(unsigned long features, const char *name)
4848 /* Fix illegal SG+CSUM combinations. */
4849 if ((features & NETIF_F_SG) &&
4850 !(features & NETIF_F_ALL_CSUM)) {
4852 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4853 "checksum feature.\n", name);
4854 features &= ~NETIF_F_SG;
4857 /* TSO requires that SG is present as well. */
4858 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4860 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4861 "SG feature.\n", name);
4862 features &= ~NETIF_F_TSO;
4865 if (features & NETIF_F_UFO) {
4866 if (!(features & NETIF_F_GEN_CSUM)) {
4868 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4869 "since no NETIF_F_HW_CSUM feature.\n",
4871 features &= ~NETIF_F_UFO;
4874 if (!(features & NETIF_F_SG)) {
4876 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4877 "since no NETIF_F_SG feature.\n", name);
4878 features &= ~NETIF_F_UFO;
4884 EXPORT_SYMBOL(netdev_fix_features);
4887 * netif_stacked_transfer_operstate - transfer operstate
4888 * @rootdev: the root or lower level device to transfer state from
4889 * @dev: the device to transfer operstate to
4891 * Transfer operational state from root to device. This is normally
4892 * called when a stacking relationship exists between the root
4893 * device and the device(a leaf device).
4895 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4896 struct net_device *dev)
4898 if (rootdev->operstate == IF_OPER_DORMANT)
4899 netif_dormant_on(dev);
4901 netif_dormant_off(dev);
4903 if (netif_carrier_ok(rootdev)) {
4904 if (!netif_carrier_ok(dev))
4905 netif_carrier_on(dev);
4907 if (netif_carrier_ok(dev))
4908 netif_carrier_off(dev);
4911 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4914 * register_netdevice - register a network device
4915 * @dev: device to register
4917 * Take a completed network device structure and add it to the kernel
4918 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4919 * chain. 0 is returned on success. A negative errno code is returned
4920 * on a failure to set up the device, or if the name is a duplicate.
4922 * Callers must hold the rtnl semaphore. You may want
4923 * register_netdev() instead of this.
4926 * The locking appears insufficient to guarantee two parallel registers
4927 * will not get the same name.
4930 int register_netdevice(struct net_device *dev)
4933 struct net *net = dev_net(dev);
4935 BUG_ON(dev_boot_phase);
4940 /* When net_device's are persistent, this will be fatal. */
4941 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4944 spin_lock_init(&dev->addr_list_lock);
4945 netdev_set_addr_lockdep_class(dev);
4946 netdev_init_queue_locks(dev);
4951 if (!dev->num_rx_queues) {
4953 * Allocate a single RX queue if driver never called
4957 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
4963 dev->_rx->first = dev->_rx;
4964 atomic_set(&dev->_rx->count, 1);
4965 dev->num_rx_queues = 1;
4968 /* Init, if this function is available */
4969 if (dev->netdev_ops->ndo_init) {
4970 ret = dev->netdev_ops->ndo_init(dev);
4978 ret = dev_get_valid_name(dev, dev->name, 0);
4982 dev->ifindex = dev_new_index(net);
4983 if (dev->iflink == -1)
4984 dev->iflink = dev->ifindex;
4986 /* Fix illegal checksum combinations */
4987 if ((dev->features & NETIF_F_HW_CSUM) &&
4988 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4989 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4991 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4994 if ((dev->features & NETIF_F_NO_CSUM) &&
4995 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4996 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4998 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5001 dev->features = netdev_fix_features(dev->features, dev->name);
5003 /* Enable software GSO if SG is supported. */
5004 if (dev->features & NETIF_F_SG)
5005 dev->features |= NETIF_F_GSO;
5007 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5008 ret = notifier_to_errno(ret);
5012 ret = netdev_register_kobject(dev);
5015 dev->reg_state = NETREG_REGISTERED;
5018 * Default initial state at registry is that the
5019 * device is present.
5022 set_bit(__LINK_STATE_PRESENT, &dev->state);
5024 dev_init_scheduler(dev);
5026 list_netdevice(dev);
5028 /* Notify protocols, that a new device appeared. */
5029 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5030 ret = notifier_to_errno(ret);
5032 rollback_registered(dev);
5033 dev->reg_state = NETREG_UNREGISTERED;
5036 * Prevent userspace races by waiting until the network
5037 * device is fully setup before sending notifications.
5039 if (!dev->rtnl_link_ops ||
5040 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5041 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5047 if (dev->netdev_ops->ndo_uninit)
5048 dev->netdev_ops->ndo_uninit(dev);
5051 EXPORT_SYMBOL(register_netdevice);
5054 * init_dummy_netdev - init a dummy network device for NAPI
5055 * @dev: device to init
5057 * This takes a network device structure and initialize the minimum
5058 * amount of fields so it can be used to schedule NAPI polls without
5059 * registering a full blown interface. This is to be used by drivers
5060 * that need to tie several hardware interfaces to a single NAPI
5061 * poll scheduler due to HW limitations.
5063 int init_dummy_netdev(struct net_device *dev)
5065 /* Clear everything. Note we don't initialize spinlocks
5066 * are they aren't supposed to be taken by any of the
5067 * NAPI code and this dummy netdev is supposed to be
5068 * only ever used for NAPI polls
5070 memset(dev, 0, sizeof(struct net_device));
5072 /* make sure we BUG if trying to hit standard
5073 * register/unregister code path
5075 dev->reg_state = NETREG_DUMMY;
5077 /* initialize the ref count */
5078 atomic_set(&dev->refcnt, 1);
5080 /* NAPI wants this */
5081 INIT_LIST_HEAD(&dev->napi_list);
5083 /* a dummy interface is started by default */
5084 set_bit(__LINK_STATE_PRESENT, &dev->state);
5085 set_bit(__LINK_STATE_START, &dev->state);
5089 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5093 * register_netdev - register a network device
5094 * @dev: device to register
5096 * Take a completed network device structure and add it to the kernel
5097 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5098 * chain. 0 is returned on success. A negative errno code is returned
5099 * on a failure to set up the device, or if the name is a duplicate.
5101 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5102 * and expands the device name if you passed a format string to
5105 int register_netdev(struct net_device *dev)
5112 * If the name is a format string the caller wants us to do a
5115 if (strchr(dev->name, '%')) {
5116 err = dev_alloc_name(dev, dev->name);
5121 err = register_netdevice(dev);
5126 EXPORT_SYMBOL(register_netdev);
5129 * netdev_wait_allrefs - wait until all references are gone.
5131 * This is called when unregistering network devices.
5133 * Any protocol or device that holds a reference should register
5134 * for netdevice notification, and cleanup and put back the
5135 * reference if they receive an UNREGISTER event.
5136 * We can get stuck here if buggy protocols don't correctly
5139 static void netdev_wait_allrefs(struct net_device *dev)
5141 unsigned long rebroadcast_time, warning_time;
5143 linkwatch_forget_dev(dev);
5145 rebroadcast_time = warning_time = jiffies;
5146 while (atomic_read(&dev->refcnt) != 0) {
5147 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5150 /* Rebroadcast unregister notification */
5151 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5152 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5153 * should have already handle it the first time */
5155 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5157 /* We must not have linkwatch events
5158 * pending on unregister. If this
5159 * happens, we simply run the queue
5160 * unscheduled, resulting in a noop
5163 linkwatch_run_queue();
5168 rebroadcast_time = jiffies;
5173 if (time_after(jiffies, warning_time + 10 * HZ)) {
5174 printk(KERN_EMERG "unregister_netdevice: "
5175 "waiting for %s to become free. Usage "
5177 dev->name, atomic_read(&dev->refcnt));
5178 warning_time = jiffies;
5187 * register_netdevice(x1);
5188 * register_netdevice(x2);
5190 * unregister_netdevice(y1);
5191 * unregister_netdevice(y2);
5197 * We are invoked by rtnl_unlock().
5198 * This allows us to deal with problems:
5199 * 1) We can delete sysfs objects which invoke hotplug
5200 * without deadlocking with linkwatch via keventd.
5201 * 2) Since we run with the RTNL semaphore not held, we can sleep
5202 * safely in order to wait for the netdev refcnt to drop to zero.
5204 * We must not return until all unregister events added during
5205 * the interval the lock was held have been completed.
5207 void netdev_run_todo(void)
5209 struct list_head list;
5211 /* Snapshot list, allow later requests */
5212 list_replace_init(&net_todo_list, &list);
5216 while (!list_empty(&list)) {
5217 struct net_device *dev
5218 = list_first_entry(&list, struct net_device, todo_list);
5219 list_del(&dev->todo_list);
5221 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5222 printk(KERN_ERR "network todo '%s' but state %d\n",
5223 dev->name, dev->reg_state);
5228 dev->reg_state = NETREG_UNREGISTERED;
5230 on_each_cpu(flush_backlog, dev, 1);
5232 netdev_wait_allrefs(dev);
5235 BUG_ON(atomic_read(&dev->refcnt));
5236 WARN_ON(dev->ip_ptr);
5237 WARN_ON(dev->ip6_ptr);
5238 WARN_ON(dev->dn_ptr);
5240 if (dev->destructor)
5241 dev->destructor(dev);
5243 /* Free network device */
5244 kobject_put(&dev->dev.kobj);
5249 * dev_txq_stats_fold - fold tx_queues stats
5250 * @dev: device to get statistics from
5251 * @stats: struct net_device_stats to hold results
5253 void dev_txq_stats_fold(const struct net_device *dev,
5254 struct net_device_stats *stats)
5256 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5258 struct netdev_queue *txq;
5260 for (i = 0; i < dev->num_tx_queues; i++) {
5261 txq = netdev_get_tx_queue(dev, i);
5262 tx_bytes += txq->tx_bytes;
5263 tx_packets += txq->tx_packets;
5264 tx_dropped += txq->tx_dropped;
5266 if (tx_bytes || tx_packets || tx_dropped) {
5267 stats->tx_bytes = tx_bytes;
5268 stats->tx_packets = tx_packets;
5269 stats->tx_dropped = tx_dropped;
5272 EXPORT_SYMBOL(dev_txq_stats_fold);
5275 * dev_get_stats - get network device statistics
5276 * @dev: device to get statistics from
5278 * Get network statistics from device. The device driver may provide
5279 * its own method by setting dev->netdev_ops->get_stats; otherwise
5280 * the internal statistics structure is used.
5282 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5284 const struct net_device_ops *ops = dev->netdev_ops;
5286 if (ops->ndo_get_stats)
5287 return ops->ndo_get_stats(dev);
5289 dev_txq_stats_fold(dev, &dev->stats);
5292 EXPORT_SYMBOL(dev_get_stats);
5294 static void netdev_init_one_queue(struct net_device *dev,
5295 struct netdev_queue *queue,
5301 static void netdev_init_queues(struct net_device *dev)
5303 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5304 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5305 spin_lock_init(&dev->tx_global_lock);
5309 * alloc_netdev_mq - allocate network device
5310 * @sizeof_priv: size of private data to allocate space for
5311 * @name: device name format string
5312 * @setup: callback to initialize device
5313 * @queue_count: the number of subqueues to allocate
5315 * Allocates a struct net_device with private data area for driver use
5316 * and performs basic initialization. Also allocates subquue structs
5317 * for each queue on the device at the end of the netdevice.
5319 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5320 void (*setup)(struct net_device *), unsigned int queue_count)
5322 struct netdev_queue *tx;
5323 struct net_device *dev;
5325 struct net_device *p;
5327 struct netdev_rx_queue *rx;
5331 BUG_ON(strlen(name) >= sizeof(dev->name));
5333 alloc_size = sizeof(struct net_device);
5335 /* ensure 32-byte alignment of private area */
5336 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5337 alloc_size += sizeof_priv;
5339 /* ensure 32-byte alignment of whole construct */
5340 alloc_size += NETDEV_ALIGN - 1;
5342 p = kzalloc(alloc_size, GFP_KERNEL);
5344 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5348 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5350 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5356 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5358 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5363 atomic_set(&rx->count, queue_count);
5366 * Set a pointer to first element in the array which holds the
5369 for (i = 0; i < queue_count; i++)
5373 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5374 dev->padded = (char *)dev - (char *)p;
5376 if (dev_addr_init(dev))
5382 dev_net_set(dev, &init_net);
5385 dev->num_tx_queues = queue_count;
5386 dev->real_num_tx_queues = queue_count;
5390 dev->num_rx_queues = queue_count;
5393 dev->gso_max_size = GSO_MAX_SIZE;
5395 netdev_init_queues(dev);
5397 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5398 dev->ethtool_ntuple_list.count = 0;
5399 INIT_LIST_HEAD(&dev->napi_list);
5400 INIT_LIST_HEAD(&dev->unreg_list);
5401 INIT_LIST_HEAD(&dev->link_watch_list);
5402 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5404 strcpy(dev->name, name);
5417 EXPORT_SYMBOL(alloc_netdev_mq);
5420 * free_netdev - free network device
5423 * This function does the last stage of destroying an allocated device
5424 * interface. The reference to the device object is released.
5425 * If this is the last reference then it will be freed.
5427 void free_netdev(struct net_device *dev)
5429 struct napi_struct *p, *n;
5431 release_net(dev_net(dev));
5435 /* Flush device addresses */
5436 dev_addr_flush(dev);
5438 /* Clear ethtool n-tuple list */
5439 ethtool_ntuple_flush(dev);
5441 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5444 /* Compatibility with error handling in drivers */
5445 if (dev->reg_state == NETREG_UNINITIALIZED) {
5446 kfree((char *)dev - dev->padded);
5450 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5451 dev->reg_state = NETREG_RELEASED;
5453 /* will free via device release */
5454 put_device(&dev->dev);
5456 EXPORT_SYMBOL(free_netdev);
5459 * synchronize_net - Synchronize with packet receive processing
5461 * Wait for packets currently being received to be done.
5462 * Does not block later packets from starting.
5464 void synchronize_net(void)
5469 EXPORT_SYMBOL(synchronize_net);
5472 * unregister_netdevice_queue - remove device from the kernel
5476 * This function shuts down a device interface and removes it
5477 * from the kernel tables.
5478 * If head not NULL, device is queued to be unregistered later.
5480 * Callers must hold the rtnl semaphore. You may want
5481 * unregister_netdev() instead of this.
5484 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5489 list_move_tail(&dev->unreg_list, head);
5491 rollback_registered(dev);
5492 /* Finish processing unregister after unlock */
5496 EXPORT_SYMBOL(unregister_netdevice_queue);
5499 * unregister_netdevice_many - unregister many devices
5500 * @head: list of devices
5502 void unregister_netdevice_many(struct list_head *head)
5504 struct net_device *dev;
5506 if (!list_empty(head)) {
5507 rollback_registered_many(head);
5508 list_for_each_entry(dev, head, unreg_list)
5512 EXPORT_SYMBOL(unregister_netdevice_many);
5515 * unregister_netdev - remove device from the kernel
5518 * This function shuts down a device interface and removes it
5519 * from the kernel tables.
5521 * This is just a wrapper for unregister_netdevice that takes
5522 * the rtnl semaphore. In general you want to use this and not
5523 * unregister_netdevice.
5525 void unregister_netdev(struct net_device *dev)
5528 unregister_netdevice(dev);
5531 EXPORT_SYMBOL(unregister_netdev);
5534 * dev_change_net_namespace - move device to different nethost namespace
5536 * @net: network namespace
5537 * @pat: If not NULL name pattern to try if the current device name
5538 * is already taken in the destination network namespace.
5540 * This function shuts down a device interface and moves it
5541 * to a new network namespace. On success 0 is returned, on
5542 * a failure a netagive errno code is returned.
5544 * Callers must hold the rtnl semaphore.
5547 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5553 /* Don't allow namespace local devices to be moved. */
5555 if (dev->features & NETIF_F_NETNS_LOCAL)
5558 /* Ensure the device has been registrered */
5560 if (dev->reg_state != NETREG_REGISTERED)
5563 /* Get out if there is nothing todo */
5565 if (net_eq(dev_net(dev), net))
5568 /* Pick the destination device name, and ensure
5569 * we can use it in the destination network namespace.
5572 if (__dev_get_by_name(net, dev->name)) {
5573 /* We get here if we can't use the current device name */
5576 if (dev_get_valid_name(dev, pat, 1))
5581 * And now a mini version of register_netdevice unregister_netdevice.
5584 /* If device is running close it first. */
5587 /* And unlink it from device chain */
5589 unlist_netdevice(dev);
5593 /* Shutdown queueing discipline. */
5596 /* Notify protocols, that we are about to destroy
5597 this device. They should clean all the things.
5599 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5600 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5603 * Flush the unicast and multicast chains
5608 /* Actually switch the network namespace */
5609 dev_net_set(dev, net);
5611 /* If there is an ifindex conflict assign a new one */
5612 if (__dev_get_by_index(net, dev->ifindex)) {
5613 int iflink = (dev->iflink == dev->ifindex);
5614 dev->ifindex = dev_new_index(net);
5616 dev->iflink = dev->ifindex;
5619 /* Fixup kobjects */
5620 err = device_rename(&dev->dev, dev->name);
5623 /* Add the device back in the hashes */
5624 list_netdevice(dev);
5626 /* Notify protocols, that a new device appeared. */
5627 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5630 * Prevent userspace races by waiting until the network
5631 * device is fully setup before sending notifications.
5633 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5640 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5642 static int dev_cpu_callback(struct notifier_block *nfb,
5643 unsigned long action,
5646 struct sk_buff **list_skb;
5647 struct sk_buff *skb;
5648 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5649 struct softnet_data *sd, *oldsd;
5651 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5654 local_irq_disable();
5655 cpu = smp_processor_id();
5656 sd = &per_cpu(softnet_data, cpu);
5657 oldsd = &per_cpu(softnet_data, oldcpu);
5659 /* Find end of our completion_queue. */
5660 list_skb = &sd->completion_queue;
5662 list_skb = &(*list_skb)->next;
5663 /* Append completion queue from offline CPU. */
5664 *list_skb = oldsd->completion_queue;
5665 oldsd->completion_queue = NULL;
5667 /* Append output queue from offline CPU. */
5668 if (oldsd->output_queue) {
5669 *sd->output_queue_tailp = oldsd->output_queue;
5670 sd->output_queue_tailp = oldsd->output_queue_tailp;
5671 oldsd->output_queue = NULL;
5672 oldsd->output_queue_tailp = &oldsd->output_queue;
5675 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5678 /* Process offline CPU's input_pkt_queue */
5679 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
5681 input_queue_head_incr(oldsd);
5683 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5685 input_queue_head_incr(oldsd);
5693 * netdev_increment_features - increment feature set by one
5694 * @all: current feature set
5695 * @one: new feature set
5696 * @mask: mask feature set
5698 * Computes a new feature set after adding a device with feature set
5699 * @one to the master device with current feature set @all. Will not
5700 * enable anything that is off in @mask. Returns the new feature set.
5702 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5705 /* If device needs checksumming, downgrade to it. */
5706 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5707 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5708 else if (mask & NETIF_F_ALL_CSUM) {
5709 /* If one device supports v4/v6 checksumming, set for all. */
5710 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5711 !(all & NETIF_F_GEN_CSUM)) {
5712 all &= ~NETIF_F_ALL_CSUM;
5713 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5716 /* If one device supports hw checksumming, set for all. */
5717 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5718 all &= ~NETIF_F_ALL_CSUM;
5719 all |= NETIF_F_HW_CSUM;
5723 one |= NETIF_F_ALL_CSUM;
5725 one |= all & NETIF_F_ONE_FOR_ALL;
5726 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5727 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5731 EXPORT_SYMBOL(netdev_increment_features);
5733 static struct hlist_head *netdev_create_hash(void)
5736 struct hlist_head *hash;
5738 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5740 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5741 INIT_HLIST_HEAD(&hash[i]);
5746 /* Initialize per network namespace state */
5747 static int __net_init netdev_init(struct net *net)
5749 INIT_LIST_HEAD(&net->dev_base_head);
5751 net->dev_name_head = netdev_create_hash();
5752 if (net->dev_name_head == NULL)
5755 net->dev_index_head = netdev_create_hash();
5756 if (net->dev_index_head == NULL)
5762 kfree(net->dev_name_head);
5768 * netdev_drivername - network driver for the device
5769 * @dev: network device
5770 * @buffer: buffer for resulting name
5771 * @len: size of buffer
5773 * Determine network driver for device.
5775 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5777 const struct device_driver *driver;
5778 const struct device *parent;
5780 if (len <= 0 || !buffer)
5784 parent = dev->dev.parent;
5789 driver = parent->driver;
5790 if (driver && driver->name)
5791 strlcpy(buffer, driver->name, len);
5795 static void __net_exit netdev_exit(struct net *net)
5797 kfree(net->dev_name_head);
5798 kfree(net->dev_index_head);
5801 static struct pernet_operations __net_initdata netdev_net_ops = {
5802 .init = netdev_init,
5803 .exit = netdev_exit,
5806 static void __net_exit default_device_exit(struct net *net)
5808 struct net_device *dev, *aux;
5810 * Push all migratable network devices back to the
5811 * initial network namespace
5814 for_each_netdev_safe(net, dev, aux) {
5816 char fb_name[IFNAMSIZ];
5818 /* Ignore unmoveable devices (i.e. loopback) */
5819 if (dev->features & NETIF_F_NETNS_LOCAL)
5822 /* Leave virtual devices for the generic cleanup */
5823 if (dev->rtnl_link_ops)
5826 /* Push remaing network devices to init_net */
5827 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5828 err = dev_change_net_namespace(dev, &init_net, fb_name);
5830 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5831 __func__, dev->name, err);
5838 static void __net_exit default_device_exit_batch(struct list_head *net_list)
5840 /* At exit all network devices most be removed from a network
5841 * namespace. Do this in the reverse order of registeration.
5842 * Do this across as many network namespaces as possible to
5843 * improve batching efficiency.
5845 struct net_device *dev;
5847 LIST_HEAD(dev_kill_list);
5850 list_for_each_entry(net, net_list, exit_list) {
5851 for_each_netdev_reverse(net, dev) {
5852 if (dev->rtnl_link_ops)
5853 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
5855 unregister_netdevice_queue(dev, &dev_kill_list);
5858 unregister_netdevice_many(&dev_kill_list);
5862 static struct pernet_operations __net_initdata default_device_ops = {
5863 .exit = default_device_exit,
5864 .exit_batch = default_device_exit_batch,
5868 * Initialize the DEV module. At boot time this walks the device list and
5869 * unhooks any devices that fail to initialise (normally hardware not
5870 * present) and leaves us with a valid list of present and active devices.
5875 * This is called single threaded during boot, so no need
5876 * to take the rtnl semaphore.
5878 static int __init net_dev_init(void)
5880 int i, rc = -ENOMEM;
5882 BUG_ON(!dev_boot_phase);
5884 if (dev_proc_init())
5887 if (netdev_kobject_init())
5890 INIT_LIST_HEAD(&ptype_all);
5891 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5892 INIT_LIST_HEAD(&ptype_base[i]);
5894 if (register_pernet_subsys(&netdev_net_ops))
5898 * Initialise the packet receive queues.
5901 for_each_possible_cpu(i) {
5902 struct softnet_data *sd = &per_cpu(softnet_data, i);
5904 memset(sd, 0, sizeof(*sd));
5905 skb_queue_head_init(&sd->input_pkt_queue);
5906 skb_queue_head_init(&sd->process_queue);
5907 sd->completion_queue = NULL;
5908 INIT_LIST_HEAD(&sd->poll_list);
5909 sd->output_queue = NULL;
5910 sd->output_queue_tailp = &sd->output_queue;
5912 sd->csd.func = rps_trigger_softirq;
5918 sd->backlog.poll = process_backlog;
5919 sd->backlog.weight = weight_p;
5920 sd->backlog.gro_list = NULL;
5921 sd->backlog.gro_count = 0;
5926 /* The loopback device is special if any other network devices
5927 * is present in a network namespace the loopback device must
5928 * be present. Since we now dynamically allocate and free the
5929 * loopback device ensure this invariant is maintained by
5930 * keeping the loopback device as the first device on the
5931 * list of network devices. Ensuring the loopback devices
5932 * is the first device that appears and the last network device
5935 if (register_pernet_device(&loopback_net_ops))
5938 if (register_pernet_device(&default_device_ops))
5941 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5942 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5944 hotcpu_notifier(dev_cpu_callback, 0);
5952 subsys_initcall(net_dev_init);
5954 static int __init initialize_hashrnd(void)
5956 get_random_bytes(&hashrnd, sizeof(hashrnd));
5960 late_initcall_sync(initialize_hashrnd);