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 *net, const char *name, char *buf,
960 if (!dev_valid_name(name))
963 if (fmt && strchr(name, '%'))
964 return __dev_alloc_name(net, name, buf);
965 else if (__dev_get_by_name(net, name))
967 else if (buf != name)
968 strlcpy(buf, name, IFNAMSIZ);
974 * dev_change_name - change name of a device
976 * @newname: name (or format string) must be at least IFNAMSIZ
978 * Change name of a device, can pass format strings "eth%d".
981 int dev_change_name(struct net_device *dev, const char *newname)
983 char oldname[IFNAMSIZ];
989 BUG_ON(!dev_net(dev));
992 if (dev->flags & IFF_UP)
995 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
998 memcpy(oldname, dev->name, IFNAMSIZ);
1000 err = dev_get_valid_name(net, newname, dev->name, 1);
1005 /* For now only devices in the initial network namespace
1008 if (net_eq(net, &init_net)) {
1009 ret = device_rename(&dev->dev, dev->name);
1011 memcpy(dev->name, oldname, IFNAMSIZ);
1016 write_lock_bh(&dev_base_lock);
1017 hlist_del(&dev->name_hlist);
1018 write_unlock_bh(&dev_base_lock);
1022 write_lock_bh(&dev_base_lock);
1023 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1024 write_unlock_bh(&dev_base_lock);
1026 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1027 ret = notifier_to_errno(ret);
1030 /* err >= 0 after dev_alloc_name() or stores the first errno */
1033 memcpy(dev->name, oldname, IFNAMSIZ);
1037 "%s: name change rollback failed: %d.\n",
1046 * dev_set_alias - change ifalias of a device
1048 * @alias: name up to IFALIASZ
1049 * @len: limit of bytes to copy from info
1051 * Set ifalias for a device,
1053 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1057 if (len >= IFALIASZ)
1062 kfree(dev->ifalias);
1063 dev->ifalias = NULL;
1068 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1072 strlcpy(dev->ifalias, alias, len+1);
1078 * netdev_features_change - device changes features
1079 * @dev: device to cause notification
1081 * Called to indicate a device has changed features.
1083 void netdev_features_change(struct net_device *dev)
1085 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1087 EXPORT_SYMBOL(netdev_features_change);
1090 * netdev_state_change - device changes state
1091 * @dev: device to cause notification
1093 * Called to indicate a device has changed state. This function calls
1094 * the notifier chains for netdev_chain and sends a NEWLINK message
1095 * to the routing socket.
1097 void netdev_state_change(struct net_device *dev)
1099 if (dev->flags & IFF_UP) {
1100 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1101 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1104 EXPORT_SYMBOL(netdev_state_change);
1106 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1108 return call_netdevice_notifiers(event, dev);
1110 EXPORT_SYMBOL(netdev_bonding_change);
1113 * dev_load - load a network module
1114 * @net: the applicable net namespace
1115 * @name: name of interface
1117 * If a network interface is not present and the process has suitable
1118 * privileges this function loads the module. If module loading is not
1119 * available in this kernel then it becomes a nop.
1122 void dev_load(struct net *net, const char *name)
1124 struct net_device *dev;
1127 dev = dev_get_by_name_rcu(net, name);
1130 if (!dev && capable(CAP_NET_ADMIN))
1131 request_module("%s", name);
1133 EXPORT_SYMBOL(dev_load);
1135 static int __dev_open(struct net_device *dev)
1137 const struct net_device_ops *ops = dev->netdev_ops;
1143 * Is it even present?
1145 if (!netif_device_present(dev))
1148 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1149 ret = notifier_to_errno(ret);
1154 * Call device private open method
1156 set_bit(__LINK_STATE_START, &dev->state);
1158 if (ops->ndo_validate_addr)
1159 ret = ops->ndo_validate_addr(dev);
1161 if (!ret && ops->ndo_open)
1162 ret = ops->ndo_open(dev);
1165 * If it went open OK then:
1169 clear_bit(__LINK_STATE_START, &dev->state);
1174 dev->flags |= IFF_UP;
1179 net_dmaengine_get();
1182 * Initialize multicasting status
1184 dev_set_rx_mode(dev);
1187 * Wakeup transmit queue engine
1196 * dev_open - prepare an interface for use.
1197 * @dev: device to open
1199 * Takes a device from down to up state. The device's private open
1200 * function is invoked and then the multicast lists are loaded. Finally
1201 * the device is moved into the up state and a %NETDEV_UP message is
1202 * sent to the netdev notifier chain.
1204 * Calling this function on an active interface is a nop. On a failure
1205 * a negative errno code is returned.
1207 int dev_open(struct net_device *dev)
1214 if (dev->flags & IFF_UP)
1220 ret = __dev_open(dev);
1225 * ... and announce new interface.
1227 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1228 call_netdevice_notifiers(NETDEV_UP, dev);
1232 EXPORT_SYMBOL(dev_open);
1234 static int __dev_close(struct net_device *dev)
1236 const struct net_device_ops *ops = dev->netdev_ops;
1242 * Tell people we are going down, so that they can
1243 * prepare to death, when device is still operating.
1245 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1247 clear_bit(__LINK_STATE_START, &dev->state);
1249 /* Synchronize to scheduled poll. We cannot touch poll list,
1250 * it can be even on different cpu. So just clear netif_running().
1252 * dev->stop() will invoke napi_disable() on all of it's
1253 * napi_struct instances on this device.
1255 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1257 dev_deactivate(dev);
1260 * Call the device specific close. This cannot fail.
1261 * Only if device is UP
1263 * We allow it to be called even after a DETACH hot-plug
1270 * Device is now down.
1273 dev->flags &= ~IFF_UP;
1278 net_dmaengine_put();
1284 * dev_close - shutdown an interface.
1285 * @dev: device to shutdown
1287 * This function moves an active device into down state. A
1288 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1289 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1292 int dev_close(struct net_device *dev)
1294 if (!(dev->flags & IFF_UP))
1300 * Tell people we are down
1302 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1303 call_netdevice_notifiers(NETDEV_DOWN, dev);
1307 EXPORT_SYMBOL(dev_close);
1311 * dev_disable_lro - disable Large Receive Offload on a device
1314 * Disable Large Receive Offload (LRO) on a net device. Must be
1315 * called under RTNL. This is needed if received packets may be
1316 * forwarded to another interface.
1318 void dev_disable_lro(struct net_device *dev)
1320 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1321 dev->ethtool_ops->set_flags) {
1322 u32 flags = dev->ethtool_ops->get_flags(dev);
1323 if (flags & ETH_FLAG_LRO) {
1324 flags &= ~ETH_FLAG_LRO;
1325 dev->ethtool_ops->set_flags(dev, flags);
1328 WARN_ON(dev->features & NETIF_F_LRO);
1330 EXPORT_SYMBOL(dev_disable_lro);
1333 static int dev_boot_phase = 1;
1336 * Device change register/unregister. These are not inline or static
1337 * as we export them to the world.
1341 * register_netdevice_notifier - register a network notifier block
1344 * Register a notifier to be called when network device events occur.
1345 * The notifier passed is linked into the kernel structures and must
1346 * not be reused until it has been unregistered. A negative errno code
1347 * is returned on a failure.
1349 * When registered all registration and up events are replayed
1350 * to the new notifier to allow device to have a race free
1351 * view of the network device list.
1354 int register_netdevice_notifier(struct notifier_block *nb)
1356 struct net_device *dev;
1357 struct net_device *last;
1362 err = raw_notifier_chain_register(&netdev_chain, nb);
1368 for_each_netdev(net, dev) {
1369 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1370 err = notifier_to_errno(err);
1374 if (!(dev->flags & IFF_UP))
1377 nb->notifier_call(nb, NETDEV_UP, dev);
1388 for_each_netdev(net, dev) {
1392 if (dev->flags & IFF_UP) {
1393 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1394 nb->notifier_call(nb, NETDEV_DOWN, dev);
1396 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1397 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1401 raw_notifier_chain_unregister(&netdev_chain, nb);
1404 EXPORT_SYMBOL(register_netdevice_notifier);
1407 * unregister_netdevice_notifier - unregister a network notifier block
1410 * Unregister a notifier previously registered by
1411 * register_netdevice_notifier(). The notifier is unlinked into the
1412 * kernel structures and may then be reused. A negative errno code
1413 * is returned on a failure.
1416 int unregister_netdevice_notifier(struct notifier_block *nb)
1421 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1425 EXPORT_SYMBOL(unregister_netdevice_notifier);
1428 * call_netdevice_notifiers - call all network notifier blocks
1429 * @val: value passed unmodified to notifier function
1430 * @dev: net_device pointer passed unmodified to notifier function
1432 * Call all network notifier blocks. Parameters and return value
1433 * are as for raw_notifier_call_chain().
1436 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1439 return raw_notifier_call_chain(&netdev_chain, val, dev);
1442 /* When > 0 there are consumers of rx skb time stamps */
1443 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1445 void net_enable_timestamp(void)
1447 atomic_inc(&netstamp_needed);
1449 EXPORT_SYMBOL(net_enable_timestamp);
1451 void net_disable_timestamp(void)
1453 atomic_dec(&netstamp_needed);
1455 EXPORT_SYMBOL(net_disable_timestamp);
1457 static inline void net_timestamp(struct sk_buff *skb)
1459 if (atomic_read(&netstamp_needed))
1460 __net_timestamp(skb);
1462 skb->tstamp.tv64 = 0;
1466 * dev_forward_skb - loopback an skb to another netif
1468 * @dev: destination network device
1469 * @skb: buffer to forward
1472 * NET_RX_SUCCESS (no congestion)
1473 * NET_RX_DROP (packet was dropped)
1475 * dev_forward_skb can be used for injecting an skb from the
1476 * start_xmit function of one device into the receive queue
1477 * of another device.
1479 * The receiving device may be in another namespace, so
1480 * we have to clear all information in the skb that could
1481 * impact namespace isolation.
1483 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1487 if (!(dev->flags & IFF_UP))
1490 if (skb->len > (dev->mtu + dev->hard_header_len))
1493 skb_set_dev(skb, dev);
1494 skb->tstamp.tv64 = 0;
1495 skb->pkt_type = PACKET_HOST;
1496 skb->protocol = eth_type_trans(skb, dev);
1497 return netif_rx(skb);
1499 EXPORT_SYMBOL_GPL(dev_forward_skb);
1502 * Support routine. Sends outgoing frames to any network
1503 * taps currently in use.
1506 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1508 struct packet_type *ptype;
1510 #ifdef CONFIG_NET_CLS_ACT
1511 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1518 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1519 /* Never send packets back to the socket
1520 * they originated from - MvS (miquels@drinkel.ow.org)
1522 if ((ptype->dev == dev || !ptype->dev) &&
1523 (ptype->af_packet_priv == NULL ||
1524 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1525 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1529 /* skb->nh should be correctly
1530 set by sender, so that the second statement is
1531 just protection against buggy protocols.
1533 skb_reset_mac_header(skb2);
1535 if (skb_network_header(skb2) < skb2->data ||
1536 skb2->network_header > skb2->tail) {
1537 if (net_ratelimit())
1538 printk(KERN_CRIT "protocol %04x is "
1540 skb2->protocol, dev->name);
1541 skb_reset_network_header(skb2);
1544 skb2->transport_header = skb2->network_header;
1545 skb2->pkt_type = PACKET_OUTGOING;
1546 ptype->func(skb2, skb->dev, ptype, skb->dev);
1553 static inline void __netif_reschedule(struct Qdisc *q)
1555 struct softnet_data *sd;
1556 unsigned long flags;
1558 local_irq_save(flags);
1559 sd = &__get_cpu_var(softnet_data);
1560 q->next_sched = sd->output_queue;
1561 sd->output_queue = q;
1562 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1563 local_irq_restore(flags);
1566 void __netif_schedule(struct Qdisc *q)
1568 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1569 __netif_reschedule(q);
1571 EXPORT_SYMBOL(__netif_schedule);
1573 void dev_kfree_skb_irq(struct sk_buff *skb)
1575 if (atomic_dec_and_test(&skb->users)) {
1576 struct softnet_data *sd;
1577 unsigned long flags;
1579 local_irq_save(flags);
1580 sd = &__get_cpu_var(softnet_data);
1581 skb->next = sd->completion_queue;
1582 sd->completion_queue = skb;
1583 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1584 local_irq_restore(flags);
1587 EXPORT_SYMBOL(dev_kfree_skb_irq);
1589 void dev_kfree_skb_any(struct sk_buff *skb)
1591 if (in_irq() || irqs_disabled())
1592 dev_kfree_skb_irq(skb);
1596 EXPORT_SYMBOL(dev_kfree_skb_any);
1600 * netif_device_detach - mark device as removed
1601 * @dev: network device
1603 * Mark device as removed from system and therefore no longer available.
1605 void netif_device_detach(struct net_device *dev)
1607 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1608 netif_running(dev)) {
1609 netif_tx_stop_all_queues(dev);
1612 EXPORT_SYMBOL(netif_device_detach);
1615 * netif_device_attach - mark device as attached
1616 * @dev: network device
1618 * Mark device as attached from system and restart if needed.
1620 void netif_device_attach(struct net_device *dev)
1622 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1623 netif_running(dev)) {
1624 netif_tx_wake_all_queues(dev);
1625 __netdev_watchdog_up(dev);
1628 EXPORT_SYMBOL(netif_device_attach);
1630 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1632 return ((features & NETIF_F_GEN_CSUM) ||
1633 ((features & NETIF_F_IP_CSUM) &&
1634 protocol == htons(ETH_P_IP)) ||
1635 ((features & NETIF_F_IPV6_CSUM) &&
1636 protocol == htons(ETH_P_IPV6)) ||
1637 ((features & NETIF_F_FCOE_CRC) &&
1638 protocol == htons(ETH_P_FCOE)));
1641 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1643 if (can_checksum_protocol(dev->features, skb->protocol))
1646 if (skb->protocol == htons(ETH_P_8021Q)) {
1647 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1648 if (can_checksum_protocol(dev->features & dev->vlan_features,
1649 veh->h_vlan_encapsulated_proto))
1657 * skb_dev_set -- assign a new device to a buffer
1658 * @skb: buffer for the new device
1659 * @dev: network device
1661 * If an skb is owned by a device already, we have to reset
1662 * all data private to the namespace a device belongs to
1663 * before assigning it a new device.
1665 #ifdef CONFIG_NET_NS
1666 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1669 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1672 skb_init_secmark(skb);
1676 skb->ipvs_property = 0;
1677 #ifdef CONFIG_NET_SCHED
1683 EXPORT_SYMBOL(skb_set_dev);
1684 #endif /* CONFIG_NET_NS */
1687 * Invalidate hardware checksum when packet is to be mangled, and
1688 * complete checksum manually on outgoing path.
1690 int skb_checksum_help(struct sk_buff *skb)
1693 int ret = 0, offset;
1695 if (skb->ip_summed == CHECKSUM_COMPLETE)
1696 goto out_set_summed;
1698 if (unlikely(skb_shinfo(skb)->gso_size)) {
1699 /* Let GSO fix up the checksum. */
1700 goto out_set_summed;
1703 offset = skb->csum_start - skb_headroom(skb);
1704 BUG_ON(offset >= skb_headlen(skb));
1705 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1707 offset += skb->csum_offset;
1708 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1710 if (skb_cloned(skb) &&
1711 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1712 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1717 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1719 skb->ip_summed = CHECKSUM_NONE;
1723 EXPORT_SYMBOL(skb_checksum_help);
1726 * skb_gso_segment - Perform segmentation on skb.
1727 * @skb: buffer to segment
1728 * @features: features for the output path (see dev->features)
1730 * This function segments the given skb and returns a list of segments.
1732 * It may return NULL if the skb requires no segmentation. This is
1733 * only possible when GSO is used for verifying header integrity.
1735 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1737 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1738 struct packet_type *ptype;
1739 __be16 type = skb->protocol;
1742 skb_reset_mac_header(skb);
1743 skb->mac_len = skb->network_header - skb->mac_header;
1744 __skb_pull(skb, skb->mac_len);
1746 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1747 struct net_device *dev = skb->dev;
1748 struct ethtool_drvinfo info = {};
1750 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1751 dev->ethtool_ops->get_drvinfo(dev, &info);
1753 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1755 info.driver, dev ? dev->features : 0L,
1756 skb->sk ? skb->sk->sk_route_caps : 0L,
1757 skb->len, skb->data_len, skb->ip_summed);
1759 if (skb_header_cloned(skb) &&
1760 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1761 return ERR_PTR(err);
1765 list_for_each_entry_rcu(ptype,
1766 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1767 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1768 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1769 err = ptype->gso_send_check(skb);
1770 segs = ERR_PTR(err);
1771 if (err || skb_gso_ok(skb, features))
1773 __skb_push(skb, (skb->data -
1774 skb_network_header(skb)));
1776 segs = ptype->gso_segment(skb, features);
1782 __skb_push(skb, skb->data - skb_mac_header(skb));
1786 EXPORT_SYMBOL(skb_gso_segment);
1788 /* Take action when hardware reception checksum errors are detected. */
1790 void netdev_rx_csum_fault(struct net_device *dev)
1792 if (net_ratelimit()) {
1793 printk(KERN_ERR "%s: hw csum failure.\n",
1794 dev ? dev->name : "<unknown>");
1798 EXPORT_SYMBOL(netdev_rx_csum_fault);
1801 /* Actually, we should eliminate this check as soon as we know, that:
1802 * 1. IOMMU is present and allows to map all the memory.
1803 * 2. No high memory really exists on this machine.
1806 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1808 #ifdef CONFIG_HIGHMEM
1810 if (!(dev->features & NETIF_F_HIGHDMA)) {
1811 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1812 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1816 if (PCI_DMA_BUS_IS_PHYS) {
1817 struct device *pdev = dev->dev.parent;
1821 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1822 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1823 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1832 void (*destructor)(struct sk_buff *skb);
1835 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1837 static void dev_gso_skb_destructor(struct sk_buff *skb)
1839 struct dev_gso_cb *cb;
1842 struct sk_buff *nskb = skb->next;
1844 skb->next = nskb->next;
1847 } while (skb->next);
1849 cb = DEV_GSO_CB(skb);
1851 cb->destructor(skb);
1855 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1856 * @skb: buffer to segment
1858 * This function segments the given skb and stores the list of segments
1861 static int dev_gso_segment(struct sk_buff *skb)
1863 struct net_device *dev = skb->dev;
1864 struct sk_buff *segs;
1865 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1868 segs = skb_gso_segment(skb, features);
1870 /* Verifying header integrity only. */
1875 return PTR_ERR(segs);
1878 DEV_GSO_CB(skb)->destructor = skb->destructor;
1879 skb->destructor = dev_gso_skb_destructor;
1885 * Try to orphan skb early, right before transmission by the device.
1886 * We cannot orphan skb if tx timestamp is requested, since
1887 * drivers need to call skb_tstamp_tx() to send the timestamp.
1889 static inline void skb_orphan_try(struct sk_buff *skb)
1891 if (!skb_tx(skb)->flags)
1895 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1896 struct netdev_queue *txq)
1898 const struct net_device_ops *ops = dev->netdev_ops;
1899 int rc = NETDEV_TX_OK;
1901 if (likely(!skb->next)) {
1902 if (!list_empty(&ptype_all))
1903 dev_queue_xmit_nit(skb, dev);
1906 * If device doesnt need skb->dst, release it right now while
1907 * its hot in this cpu cache
1909 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1912 skb_orphan_try(skb);
1914 if (netif_needs_gso(dev, skb)) {
1915 if (unlikely(dev_gso_segment(skb)))
1921 rc = ops->ndo_start_xmit(skb, dev);
1922 if (rc == NETDEV_TX_OK)
1923 txq_trans_update(txq);
1929 struct sk_buff *nskb = skb->next;
1931 skb->next = nskb->next;
1935 * If device doesnt need nskb->dst, release it right now while
1936 * its hot in this cpu cache
1938 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1941 rc = ops->ndo_start_xmit(nskb, dev);
1942 if (unlikely(rc != NETDEV_TX_OK)) {
1943 if (rc & ~NETDEV_TX_MASK)
1944 goto out_kfree_gso_skb;
1945 nskb->next = skb->next;
1949 txq_trans_update(txq);
1950 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1951 return NETDEV_TX_BUSY;
1952 } while (skb->next);
1955 if (likely(skb->next == NULL))
1956 skb->destructor = DEV_GSO_CB(skb)->destructor;
1962 static u32 hashrnd __read_mostly;
1964 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1968 if (skb_rx_queue_recorded(skb)) {
1969 hash = skb_get_rx_queue(skb);
1970 while (unlikely(hash >= dev->real_num_tx_queues))
1971 hash -= dev->real_num_tx_queues;
1975 if (skb->sk && skb->sk->sk_hash)
1976 hash = skb->sk->sk_hash;
1978 hash = (__force u16) skb->protocol;
1980 hash = jhash_1word(hash, hashrnd);
1982 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1984 EXPORT_SYMBOL(skb_tx_hash);
1986 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
1988 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
1989 if (net_ratelimit()) {
1990 pr_warning("%s selects TX queue %d, but "
1991 "real number of TX queues is %d\n",
1992 dev->name, queue_index, dev->real_num_tx_queues);
1999 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2000 struct sk_buff *skb)
2003 struct sock *sk = skb->sk;
2005 if (sk_tx_queue_recorded(sk)) {
2006 queue_index = sk_tx_queue_get(sk);
2008 const struct net_device_ops *ops = dev->netdev_ops;
2010 if (ops->ndo_select_queue) {
2011 queue_index = ops->ndo_select_queue(dev, skb);
2012 queue_index = dev_cap_txqueue(dev, queue_index);
2015 if (dev->real_num_tx_queues > 1)
2016 queue_index = skb_tx_hash(dev, skb);
2019 struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
2021 if (dst && skb_dst(skb) == dst)
2022 sk_tx_queue_set(sk, queue_index);
2027 skb_set_queue_mapping(skb, queue_index);
2028 return netdev_get_tx_queue(dev, queue_index);
2031 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2032 struct net_device *dev,
2033 struct netdev_queue *txq)
2035 spinlock_t *root_lock = qdisc_lock(q);
2038 spin_lock(root_lock);
2039 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2042 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2043 !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
2045 * This is a work-conserving queue; there are no old skbs
2046 * waiting to be sent out; and the qdisc is not running -
2047 * xmit the skb directly.
2049 __qdisc_update_bstats(q, skb->len);
2050 if (sch_direct_xmit(skb, q, dev, txq, root_lock))
2053 clear_bit(__QDISC_STATE_RUNNING, &q->state);
2055 rc = NET_XMIT_SUCCESS;
2057 rc = qdisc_enqueue_root(skb, q);
2060 spin_unlock(root_lock);
2066 * Returns true if either:
2067 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2068 * 2. skb is fragmented and the device does not support SG, or if
2069 * at least one of fragments is in highmem and device does not
2070 * support DMA from it.
2072 static inline int skb_needs_linearize(struct sk_buff *skb,
2073 struct net_device *dev)
2075 return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
2076 (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
2077 illegal_highdma(dev, skb)));
2081 * dev_queue_xmit - transmit a buffer
2082 * @skb: buffer to transmit
2084 * Queue a buffer for transmission to a network device. The caller must
2085 * have set the device and priority and built the buffer before calling
2086 * this function. The function can be called from an interrupt.
2088 * A negative errno code is returned on a failure. A success does not
2089 * guarantee the frame will be transmitted as it may be dropped due
2090 * to congestion or traffic shaping.
2092 * -----------------------------------------------------------------------------------
2093 * I notice this method can also return errors from the queue disciplines,
2094 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2097 * Regardless of the return value, the skb is consumed, so it is currently
2098 * difficult to retry a send to this method. (You can bump the ref count
2099 * before sending to hold a reference for retry if you are careful.)
2101 * When calling this method, interrupts MUST be enabled. This is because
2102 * the BH enable code must have IRQs enabled so that it will not deadlock.
2105 int dev_queue_xmit(struct sk_buff *skb)
2107 struct net_device *dev = skb->dev;
2108 struct netdev_queue *txq;
2112 /* GSO will handle the following emulations directly. */
2113 if (netif_needs_gso(dev, skb))
2116 /* Convert a paged skb to linear, if required */
2117 if (skb_needs_linearize(skb, dev) && __skb_linearize(skb))
2120 /* If packet is not checksummed and device does not support
2121 * checksumming for this protocol, complete checksumming here.
2123 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2124 skb_set_transport_header(skb, skb->csum_start -
2126 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
2131 /* Disable soft irqs for various locks below. Also
2132 * stops preemption for RCU.
2136 txq = dev_pick_tx(dev, skb);
2137 q = rcu_dereference_bh(txq->qdisc);
2139 #ifdef CONFIG_NET_CLS_ACT
2140 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2143 rc = __dev_xmit_skb(skb, q, dev, txq);
2147 /* The device has no queue. Common case for software devices:
2148 loopback, all the sorts of tunnels...
2150 Really, it is unlikely that netif_tx_lock protection is necessary
2151 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2153 However, it is possible, that they rely on protection
2156 Check this and shot the lock. It is not prone from deadlocks.
2157 Either shot noqueue qdisc, it is even simpler 8)
2159 if (dev->flags & IFF_UP) {
2160 int cpu = smp_processor_id(); /* ok because BHs are off */
2162 if (txq->xmit_lock_owner != cpu) {
2164 HARD_TX_LOCK(dev, txq, cpu);
2166 if (!netif_tx_queue_stopped(txq)) {
2167 rc = dev_hard_start_xmit(skb, dev, txq);
2168 if (dev_xmit_complete(rc)) {
2169 HARD_TX_UNLOCK(dev, txq);
2173 HARD_TX_UNLOCK(dev, txq);
2174 if (net_ratelimit())
2175 printk(KERN_CRIT "Virtual device %s asks to "
2176 "queue packet!\n", dev->name);
2178 /* Recursion is detected! It is possible,
2180 if (net_ratelimit())
2181 printk(KERN_CRIT "Dead loop on virtual device "
2182 "%s, fix it urgently!\n", dev->name);
2187 rcu_read_unlock_bh();
2193 rcu_read_unlock_bh();
2196 EXPORT_SYMBOL(dev_queue_xmit);
2199 /*=======================================================================
2201 =======================================================================*/
2203 int netdev_max_backlog __read_mostly = 1000;
2204 int netdev_budget __read_mostly = 300;
2205 int weight_p __read_mostly = 64; /* old backlog weight */
2207 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
2211 /* One global table that all flow-based protocols share. */
2212 struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
2213 EXPORT_SYMBOL(rps_sock_flow_table);
2216 * get_rps_cpu is called from netif_receive_skb and returns the target
2217 * CPU from the RPS map of the receiving queue for a given skb.
2218 * rcu_read_lock must be held on entry.
2220 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2221 struct rps_dev_flow **rflowp)
2223 struct ipv6hdr *ip6;
2225 struct netdev_rx_queue *rxqueue;
2226 struct rps_map *map;
2227 struct rps_dev_flow_table *flow_table;
2228 struct rps_sock_flow_table *sock_flow_table;
2232 u32 addr1, addr2, ihl;
2238 if (skb_rx_queue_recorded(skb)) {
2239 u16 index = skb_get_rx_queue(skb);
2240 if (unlikely(index >= dev->num_rx_queues)) {
2241 if (net_ratelimit()) {
2242 pr_warning("%s received packet on queue "
2243 "%u, but number of RX queues is %u\n",
2244 dev->name, index, dev->num_rx_queues);
2248 rxqueue = dev->_rx + index;
2252 if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
2256 goto got_hash; /* Skip hash computation on packet header */
2258 switch (skb->protocol) {
2259 case __constant_htons(ETH_P_IP):
2260 if (!pskb_may_pull(skb, sizeof(*ip)))
2263 ip = (struct iphdr *) skb->data;
2264 ip_proto = ip->protocol;
2265 addr1 = (__force u32) ip->saddr;
2266 addr2 = (__force u32) ip->daddr;
2269 case __constant_htons(ETH_P_IPV6):
2270 if (!pskb_may_pull(skb, sizeof(*ip6)))
2273 ip6 = (struct ipv6hdr *) skb->data;
2274 ip_proto = ip6->nexthdr;
2275 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2276 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2289 case IPPROTO_UDPLITE:
2290 if (pskb_may_pull(skb, (ihl * 4) + 4)) {
2291 ports.v32 = * (__force u32 *) (skb->data + (ihl * 4));
2292 if (ports.v16[1] < ports.v16[0])
2293 swap(ports.v16[0], ports.v16[1]);
2301 /* get a consistent hash (same value on both flow directions) */
2304 skb->rxhash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2309 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2310 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2311 if (flow_table && sock_flow_table) {
2313 struct rps_dev_flow *rflow;
2315 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2318 next_cpu = sock_flow_table->ents[skb->rxhash &
2319 sock_flow_table->mask];
2322 * If the desired CPU (where last recvmsg was done) is
2323 * different from current CPU (one in the rx-queue flow
2324 * table entry), switch if one of the following holds:
2325 * - Current CPU is unset (equal to RPS_NO_CPU).
2326 * - Current CPU is offline.
2327 * - The current CPU's queue tail has advanced beyond the
2328 * last packet that was enqueued using this table entry.
2329 * This guarantees that all previous packets for the flow
2330 * have been dequeued, thus preserving in order delivery.
2332 if (unlikely(tcpu != next_cpu) &&
2333 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2334 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2335 rflow->last_qtail)) >= 0)) {
2336 tcpu = rflow->cpu = next_cpu;
2337 if (tcpu != RPS_NO_CPU)
2338 rflow->last_qtail = per_cpu(softnet_data,
2339 tcpu).input_queue_head;
2341 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2348 map = rcu_dereference(rxqueue->rps_map);
2350 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2352 if (cpu_online(tcpu)) {
2362 /* Called from hardirq (IPI) context */
2363 static void rps_trigger_softirq(void *data)
2365 struct softnet_data *sd = data;
2367 __napi_schedule(&sd->backlog);
2368 __get_cpu_var(netdev_rx_stat).received_rps++;
2371 #endif /* CONFIG_RPS */
2374 * Check if this softnet_data structure is another cpu one
2375 * If yes, queue it to our IPI list and return 1
2378 static int rps_ipi_queued(struct softnet_data *sd)
2381 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2384 sd->rps_ipi_next = mysd->rps_ipi_list;
2385 mysd->rps_ipi_list = sd;
2387 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2390 #endif /* CONFIG_RPS */
2395 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2396 * queue (may be a remote CPU queue).
2398 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2399 unsigned int *qtail)
2401 struct softnet_data *sd;
2402 unsigned long flags;
2404 sd = &per_cpu(softnet_data, cpu);
2406 local_irq_save(flags);
2407 __get_cpu_var(netdev_rx_stat).total++;
2410 if (sd->input_pkt_queue.qlen <= netdev_max_backlog) {
2411 if (sd->input_pkt_queue.qlen) {
2413 __skb_queue_tail(&sd->input_pkt_queue, skb);
2415 *qtail = sd->input_queue_head + sd->input_pkt_queue.qlen;
2418 local_irq_restore(flags);
2419 return NET_RX_SUCCESS;
2422 /* Schedule NAPI for backlog device */
2423 if (napi_schedule_prep(&sd->backlog)) {
2424 if (!rps_ipi_queued(sd))
2425 __napi_schedule(&sd->backlog);
2432 __get_cpu_var(netdev_rx_stat).dropped++;
2433 local_irq_restore(flags);
2440 * netif_rx - post buffer to the network code
2441 * @skb: buffer to post
2443 * This function receives a packet from a device driver and queues it for
2444 * the upper (protocol) levels to process. It always succeeds. The buffer
2445 * may be dropped during processing for congestion control or by the
2449 * NET_RX_SUCCESS (no congestion)
2450 * NET_RX_DROP (packet was dropped)
2454 int netif_rx(struct sk_buff *skb)
2458 /* if netpoll wants it, pretend we never saw it */
2459 if (netpoll_rx(skb))
2462 if (!skb->tstamp.tv64)
2467 struct rps_dev_flow voidflow, *rflow = &voidflow;
2472 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2474 cpu = smp_processor_id();
2476 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2483 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2489 EXPORT_SYMBOL(netif_rx);
2491 int netif_rx_ni(struct sk_buff *skb)
2496 err = netif_rx(skb);
2497 if (local_softirq_pending())
2503 EXPORT_SYMBOL(netif_rx_ni);
2505 static void net_tx_action(struct softirq_action *h)
2507 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2509 if (sd->completion_queue) {
2510 struct sk_buff *clist;
2512 local_irq_disable();
2513 clist = sd->completion_queue;
2514 sd->completion_queue = NULL;
2518 struct sk_buff *skb = clist;
2519 clist = clist->next;
2521 WARN_ON(atomic_read(&skb->users));
2526 if (sd->output_queue) {
2529 local_irq_disable();
2530 head = sd->output_queue;
2531 sd->output_queue = NULL;
2535 struct Qdisc *q = head;
2536 spinlock_t *root_lock;
2538 head = head->next_sched;
2540 root_lock = qdisc_lock(q);
2541 if (spin_trylock(root_lock)) {
2542 smp_mb__before_clear_bit();
2543 clear_bit(__QDISC_STATE_SCHED,
2546 spin_unlock(root_lock);
2548 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2550 __netif_reschedule(q);
2552 smp_mb__before_clear_bit();
2553 clear_bit(__QDISC_STATE_SCHED,
2561 static inline int deliver_skb(struct sk_buff *skb,
2562 struct packet_type *pt_prev,
2563 struct net_device *orig_dev)
2565 atomic_inc(&skb->users);
2566 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2569 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2571 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
2572 /* This hook is defined here for ATM LANE */
2573 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2574 unsigned char *addr) __read_mostly;
2575 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2579 * If bridge module is loaded call bridging hook.
2580 * returns NULL if packet was consumed.
2582 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2583 struct sk_buff *skb) __read_mostly;
2584 EXPORT_SYMBOL_GPL(br_handle_frame_hook);
2586 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2587 struct packet_type **pt_prev, int *ret,
2588 struct net_device *orig_dev)
2590 struct net_bridge_port *port;
2592 if (skb->pkt_type == PACKET_LOOPBACK ||
2593 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2597 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2601 return br_handle_frame_hook(port, skb);
2604 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2607 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2608 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2609 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2611 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2612 struct packet_type **pt_prev,
2614 struct net_device *orig_dev)
2616 if (skb->dev->macvlan_port == NULL)
2620 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2623 return macvlan_handle_frame_hook(skb);
2626 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2629 #ifdef CONFIG_NET_CLS_ACT
2630 /* TODO: Maybe we should just force sch_ingress to be compiled in
2631 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2632 * a compare and 2 stores extra right now if we dont have it on
2633 * but have CONFIG_NET_CLS_ACT
2634 * NOTE: This doesnt stop any functionality; if you dont have
2635 * the ingress scheduler, you just cant add policies on ingress.
2638 static int ing_filter(struct sk_buff *skb)
2640 struct net_device *dev = skb->dev;
2641 u32 ttl = G_TC_RTTL(skb->tc_verd);
2642 struct netdev_queue *rxq;
2643 int result = TC_ACT_OK;
2646 if (MAX_RED_LOOP < ttl++) {
2648 "Redir loop detected Dropping packet (%d->%d)\n",
2649 skb->skb_iif, dev->ifindex);
2653 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2654 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2656 rxq = &dev->rx_queue;
2659 if (q != &noop_qdisc) {
2660 spin_lock(qdisc_lock(q));
2661 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2662 result = qdisc_enqueue_root(skb, q);
2663 spin_unlock(qdisc_lock(q));
2669 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2670 struct packet_type **pt_prev,
2671 int *ret, struct net_device *orig_dev)
2673 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2677 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2680 /* Huh? Why does turning on AF_PACKET affect this? */
2681 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2684 switch (ing_filter(skb)) {
2698 * netif_nit_deliver - deliver received packets to network taps
2701 * This function is used to deliver incoming packets to network
2702 * taps. It should be used when the normal netif_receive_skb path
2703 * is bypassed, for example because of VLAN acceleration.
2705 void netif_nit_deliver(struct sk_buff *skb)
2707 struct packet_type *ptype;
2709 if (list_empty(&ptype_all))
2712 skb_reset_network_header(skb);
2713 skb_reset_transport_header(skb);
2714 skb->mac_len = skb->network_header - skb->mac_header;
2717 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2718 if (!ptype->dev || ptype->dev == skb->dev)
2719 deliver_skb(skb, ptype, skb->dev);
2724 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2725 struct net_device *master)
2727 if (skb->pkt_type == PACKET_HOST) {
2728 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2730 memcpy(dest, master->dev_addr, ETH_ALEN);
2734 /* On bonding slaves other than the currently active slave, suppress
2735 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2736 * ARP on active-backup slaves with arp_validate enabled.
2738 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2740 struct net_device *dev = skb->dev;
2742 if (master->priv_flags & IFF_MASTER_ARPMON)
2743 dev->last_rx = jiffies;
2745 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
2746 /* Do address unmangle. The local destination address
2747 * will be always the one master has. Provides the right
2748 * functionality in a bridge.
2750 skb_bond_set_mac_by_master(skb, master);
2753 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2754 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2755 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2758 if (master->priv_flags & IFF_MASTER_ALB) {
2759 if (skb->pkt_type != PACKET_BROADCAST &&
2760 skb->pkt_type != PACKET_MULTICAST)
2763 if (master->priv_flags & IFF_MASTER_8023AD &&
2764 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2771 EXPORT_SYMBOL(__skb_bond_should_drop);
2773 static int __netif_receive_skb(struct sk_buff *skb)
2775 struct packet_type *ptype, *pt_prev;
2776 struct net_device *orig_dev;
2777 struct net_device *master;
2778 struct net_device *null_or_orig;
2779 struct net_device *null_or_bond;
2780 int ret = NET_RX_DROP;
2783 if (!skb->tstamp.tv64)
2786 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2787 return NET_RX_SUCCESS;
2789 /* if we've gotten here through NAPI, check netpoll */
2790 if (netpoll_receive_skb(skb))
2794 skb->skb_iif = skb->dev->ifindex;
2796 null_or_orig = NULL;
2797 orig_dev = skb->dev;
2798 master = ACCESS_ONCE(orig_dev->master);
2800 if (skb_bond_should_drop(skb, master))
2801 null_or_orig = orig_dev; /* deliver only exact match */
2806 __get_cpu_var(netdev_rx_stat).total++;
2808 skb_reset_network_header(skb);
2809 skb_reset_transport_header(skb);
2810 skb->mac_len = skb->network_header - skb->mac_header;
2816 #ifdef CONFIG_NET_CLS_ACT
2817 if (skb->tc_verd & TC_NCLS) {
2818 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2823 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2824 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2825 ptype->dev == orig_dev) {
2827 ret = deliver_skb(skb, pt_prev, orig_dev);
2832 #ifdef CONFIG_NET_CLS_ACT
2833 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2839 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2842 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2847 * Make sure frames received on VLAN interfaces stacked on
2848 * bonding interfaces still make their way to any base bonding
2849 * device that may have registered for a specific ptype. The
2850 * handler may have to adjust skb->dev and orig_dev.
2852 null_or_bond = NULL;
2853 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2854 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2855 null_or_bond = vlan_dev_real_dev(skb->dev);
2858 type = skb->protocol;
2859 list_for_each_entry_rcu(ptype,
2860 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2861 if (ptype->type == type && (ptype->dev == null_or_orig ||
2862 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2863 ptype->dev == null_or_bond)) {
2865 ret = deliver_skb(skb, pt_prev, orig_dev);
2871 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2874 /* Jamal, now you will not able to escape explaining
2875 * me how you were going to use this. :-)
2886 * netif_receive_skb - process receive buffer from network
2887 * @skb: buffer to process
2889 * netif_receive_skb() is the main receive data processing function.
2890 * It always succeeds. The buffer may be dropped during processing
2891 * for congestion control or by the protocol layers.
2893 * This function may only be called from softirq context and interrupts
2894 * should be enabled.
2896 * Return values (usually ignored):
2897 * NET_RX_SUCCESS: no congestion
2898 * NET_RX_DROP: packet was dropped
2900 int netif_receive_skb(struct sk_buff *skb)
2903 struct rps_dev_flow voidflow, *rflow = &voidflow;
2908 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2911 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2915 ret = __netif_receive_skb(skb);
2920 return __netif_receive_skb(skb);
2923 EXPORT_SYMBOL(netif_receive_skb);
2925 /* Network device is going away, flush any packets still pending
2926 * Called with irqs disabled.
2928 static void flush_backlog(void *arg)
2930 struct net_device *dev = arg;
2931 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2932 struct sk_buff *skb, *tmp;
2935 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp)
2936 if (skb->dev == dev) {
2937 __skb_unlink(skb, &sd->input_pkt_queue);
2939 input_queue_head_incr(sd);
2944 static int napi_gro_complete(struct sk_buff *skb)
2946 struct packet_type *ptype;
2947 __be16 type = skb->protocol;
2948 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2951 if (NAPI_GRO_CB(skb)->count == 1) {
2952 skb_shinfo(skb)->gso_size = 0;
2957 list_for_each_entry_rcu(ptype, head, list) {
2958 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2961 err = ptype->gro_complete(skb);
2967 WARN_ON(&ptype->list == head);
2969 return NET_RX_SUCCESS;
2973 return netif_receive_skb(skb);
2976 static void napi_gro_flush(struct napi_struct *napi)
2978 struct sk_buff *skb, *next;
2980 for (skb = napi->gro_list; skb; skb = next) {
2983 napi_gro_complete(skb);
2986 napi->gro_count = 0;
2987 napi->gro_list = NULL;
2990 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2992 struct sk_buff **pp = NULL;
2993 struct packet_type *ptype;
2994 __be16 type = skb->protocol;
2995 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2998 enum gro_result ret;
3000 if (!(skb->dev->features & NETIF_F_GRO))
3003 if (skb_is_gso(skb) || skb_has_frags(skb))
3007 list_for_each_entry_rcu(ptype, head, list) {
3008 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3011 skb_set_network_header(skb, skb_gro_offset(skb));
3012 mac_len = skb->network_header - skb->mac_header;
3013 skb->mac_len = mac_len;
3014 NAPI_GRO_CB(skb)->same_flow = 0;
3015 NAPI_GRO_CB(skb)->flush = 0;
3016 NAPI_GRO_CB(skb)->free = 0;
3018 pp = ptype->gro_receive(&napi->gro_list, skb);
3023 if (&ptype->list == head)
3026 same_flow = NAPI_GRO_CB(skb)->same_flow;
3027 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3030 struct sk_buff *nskb = *pp;
3034 napi_gro_complete(nskb);
3041 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3045 NAPI_GRO_CB(skb)->count = 1;
3046 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3047 skb->next = napi->gro_list;
3048 napi->gro_list = skb;
3052 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3053 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3055 BUG_ON(skb->end - skb->tail < grow);
3057 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3060 skb->data_len -= grow;
3062 skb_shinfo(skb)->frags[0].page_offset += grow;
3063 skb_shinfo(skb)->frags[0].size -= grow;
3065 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3066 put_page(skb_shinfo(skb)->frags[0].page);
3067 memmove(skb_shinfo(skb)->frags,
3068 skb_shinfo(skb)->frags + 1,
3069 --skb_shinfo(skb)->nr_frags);
3080 EXPORT_SYMBOL(dev_gro_receive);
3083 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3087 if (netpoll_rx_on(skb))
3090 for (p = napi->gro_list; p; p = p->next) {
3091 NAPI_GRO_CB(p)->same_flow =
3092 (p->dev == skb->dev) &&
3093 !compare_ether_header(skb_mac_header(p),
3094 skb_gro_mac_header(skb));
3095 NAPI_GRO_CB(p)->flush = 0;
3098 return dev_gro_receive(napi, skb);
3101 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3105 if (netif_receive_skb(skb))
3110 case GRO_MERGED_FREE:
3121 EXPORT_SYMBOL(napi_skb_finish);
3123 void skb_gro_reset_offset(struct sk_buff *skb)
3125 NAPI_GRO_CB(skb)->data_offset = 0;
3126 NAPI_GRO_CB(skb)->frag0 = NULL;
3127 NAPI_GRO_CB(skb)->frag0_len = 0;
3129 if (skb->mac_header == skb->tail &&
3130 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3131 NAPI_GRO_CB(skb)->frag0 =
3132 page_address(skb_shinfo(skb)->frags[0].page) +
3133 skb_shinfo(skb)->frags[0].page_offset;
3134 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3137 EXPORT_SYMBOL(skb_gro_reset_offset);
3139 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3141 skb_gro_reset_offset(skb);
3143 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3145 EXPORT_SYMBOL(napi_gro_receive);
3147 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3149 __skb_pull(skb, skb_headlen(skb));
3150 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3154 EXPORT_SYMBOL(napi_reuse_skb);
3156 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3158 struct sk_buff *skb = napi->skb;
3161 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3167 EXPORT_SYMBOL(napi_get_frags);
3169 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3175 skb->protocol = eth_type_trans(skb, skb->dev);
3177 if (ret == GRO_HELD)
3178 skb_gro_pull(skb, -ETH_HLEN);
3179 else if (netif_receive_skb(skb))
3184 case GRO_MERGED_FREE:
3185 napi_reuse_skb(napi, skb);
3194 EXPORT_SYMBOL(napi_frags_finish);
3196 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3198 struct sk_buff *skb = napi->skb;
3205 skb_reset_mac_header(skb);
3206 skb_gro_reset_offset(skb);
3208 off = skb_gro_offset(skb);
3209 hlen = off + sizeof(*eth);
3210 eth = skb_gro_header_fast(skb, off);
3211 if (skb_gro_header_hard(skb, hlen)) {
3212 eth = skb_gro_header_slow(skb, hlen, off);
3213 if (unlikely(!eth)) {
3214 napi_reuse_skb(napi, skb);
3220 skb_gro_pull(skb, sizeof(*eth));
3223 * This works because the only protocols we care about don't require
3224 * special handling. We'll fix it up properly at the end.
3226 skb->protocol = eth->h_proto;
3231 EXPORT_SYMBOL(napi_frags_skb);
3233 gro_result_t napi_gro_frags(struct napi_struct *napi)
3235 struct sk_buff *skb = napi_frags_skb(napi);
3240 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3242 EXPORT_SYMBOL(napi_gro_frags);
3245 * net_rps_action sends any pending IPI's for rps.
3246 * Note: called with local irq disabled, but exits with local irq enabled.
3248 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3251 struct softnet_data *remsd = sd->rps_ipi_list;
3254 sd->rps_ipi_list = NULL;
3258 /* Send pending IPI's to kick RPS processing on remote cpus. */
3260 struct softnet_data *next = remsd->rps_ipi_next;
3262 if (cpu_online(remsd->cpu))
3263 __smp_call_function_single(remsd->cpu,
3272 static int process_backlog(struct napi_struct *napi, int quota)
3275 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3278 /* Check if we have pending ipi, its better to send them now,
3279 * not waiting net_rx_action() end.
3281 if (sd->rps_ipi_list) {
3282 local_irq_disable();
3283 net_rps_action_and_irq_enable(sd);
3286 napi->weight = weight_p;
3288 struct sk_buff *skb;
3290 local_irq_disable();
3292 skb = __skb_dequeue(&sd->input_pkt_queue);
3294 __napi_complete(napi);
3299 input_queue_head_incr(sd);
3303 __netif_receive_skb(skb);
3304 } while (++work < quota);
3310 * __napi_schedule - schedule for receive
3311 * @n: entry to schedule
3313 * The entry's receive function will be scheduled to run
3315 void __napi_schedule(struct napi_struct *n)
3317 unsigned long flags;
3319 local_irq_save(flags);
3320 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
3321 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3322 local_irq_restore(flags);
3324 EXPORT_SYMBOL(__napi_schedule);
3326 void __napi_complete(struct napi_struct *n)
3328 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3329 BUG_ON(n->gro_list);
3331 list_del(&n->poll_list);
3332 smp_mb__before_clear_bit();
3333 clear_bit(NAPI_STATE_SCHED, &n->state);
3335 EXPORT_SYMBOL(__napi_complete);
3337 void napi_complete(struct napi_struct *n)
3339 unsigned long flags;
3342 * don't let napi dequeue from the cpu poll list
3343 * just in case its running on a different cpu
3345 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3349 local_irq_save(flags);
3351 local_irq_restore(flags);
3353 EXPORT_SYMBOL(napi_complete);
3355 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3356 int (*poll)(struct napi_struct *, int), int weight)
3358 INIT_LIST_HEAD(&napi->poll_list);
3359 napi->gro_count = 0;
3360 napi->gro_list = NULL;
3363 napi->weight = weight;
3364 list_add(&napi->dev_list, &dev->napi_list);
3366 #ifdef CONFIG_NETPOLL
3367 spin_lock_init(&napi->poll_lock);
3368 napi->poll_owner = -1;
3370 set_bit(NAPI_STATE_SCHED, &napi->state);
3372 EXPORT_SYMBOL(netif_napi_add);
3374 void netif_napi_del(struct napi_struct *napi)
3376 struct sk_buff *skb, *next;
3378 list_del_init(&napi->dev_list);
3379 napi_free_frags(napi);
3381 for (skb = napi->gro_list; skb; skb = next) {
3387 napi->gro_list = NULL;
3388 napi->gro_count = 0;
3390 EXPORT_SYMBOL(netif_napi_del);
3392 static void net_rx_action(struct softirq_action *h)
3394 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3395 unsigned long time_limit = jiffies + 2;
3396 int budget = netdev_budget;
3399 local_irq_disable();
3401 while (!list_empty(&sd->poll_list)) {
3402 struct napi_struct *n;
3405 /* If softirq window is exhuasted then punt.
3406 * Allow this to run for 2 jiffies since which will allow
3407 * an average latency of 1.5/HZ.
3409 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3414 /* Even though interrupts have been re-enabled, this
3415 * access is safe because interrupts can only add new
3416 * entries to the tail of this list, and only ->poll()
3417 * calls can remove this head entry from the list.
3419 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3421 have = netpoll_poll_lock(n);
3425 /* This NAPI_STATE_SCHED test is for avoiding a race
3426 * with netpoll's poll_napi(). Only the entity which
3427 * obtains the lock and sees NAPI_STATE_SCHED set will
3428 * actually make the ->poll() call. Therefore we avoid
3429 * accidently calling ->poll() when NAPI is not scheduled.
3432 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3433 work = n->poll(n, weight);
3437 WARN_ON_ONCE(work > weight);
3441 local_irq_disable();
3443 /* Drivers must not modify the NAPI state if they
3444 * consume the entire weight. In such cases this code
3445 * still "owns" the NAPI instance and therefore can
3446 * move the instance around on the list at-will.
3448 if (unlikely(work == weight)) {
3449 if (unlikely(napi_disable_pending(n))) {
3452 local_irq_disable();
3454 list_move_tail(&n->poll_list, &sd->poll_list);
3457 netpoll_poll_unlock(have);
3460 net_rps_action_and_irq_enable(sd);
3462 #ifdef CONFIG_NET_DMA
3464 * There may not be any more sk_buffs coming right now, so push
3465 * any pending DMA copies to hardware
3467 dma_issue_pending_all();
3473 __get_cpu_var(netdev_rx_stat).time_squeeze++;
3474 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3478 static gifconf_func_t *gifconf_list[NPROTO];
3481 * register_gifconf - register a SIOCGIF handler
3482 * @family: Address family
3483 * @gifconf: Function handler
3485 * Register protocol dependent address dumping routines. The handler
3486 * that is passed must not be freed or reused until it has been replaced
3487 * by another handler.
3489 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3491 if (family >= NPROTO)
3493 gifconf_list[family] = gifconf;
3496 EXPORT_SYMBOL(register_gifconf);
3500 * Map an interface index to its name (SIOCGIFNAME)
3504 * We need this ioctl for efficient implementation of the
3505 * if_indextoname() function required by the IPv6 API. Without
3506 * it, we would have to search all the interfaces to find a
3510 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3512 struct net_device *dev;
3516 * Fetch the caller's info block.
3519 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3523 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3529 strcpy(ifr.ifr_name, dev->name);
3532 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3538 * Perform a SIOCGIFCONF call. This structure will change
3539 * size eventually, and there is nothing I can do about it.
3540 * Thus we will need a 'compatibility mode'.
3543 static int dev_ifconf(struct net *net, char __user *arg)
3546 struct net_device *dev;
3553 * Fetch the caller's info block.
3556 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3563 * Loop over the interfaces, and write an info block for each.
3567 for_each_netdev(net, dev) {
3568 for (i = 0; i < NPROTO; i++) {
3569 if (gifconf_list[i]) {
3572 done = gifconf_list[i](dev, NULL, 0);
3574 done = gifconf_list[i](dev, pos + total,
3584 * All done. Write the updated control block back to the caller.
3586 ifc.ifc_len = total;
3589 * Both BSD and Solaris return 0 here, so we do too.
3591 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3594 #ifdef CONFIG_PROC_FS
3596 * This is invoked by the /proc filesystem handler to display a device
3599 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3602 struct net *net = seq_file_net(seq);
3604 struct net_device *dev;
3608 return SEQ_START_TOKEN;
3611 for_each_netdev_rcu(net, dev)
3618 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3620 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3621 first_net_device(seq_file_net(seq)) :
3622 next_net_device((struct net_device *)v);
3625 return rcu_dereference(dev);
3628 void dev_seq_stop(struct seq_file *seq, void *v)
3634 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3636 const struct net_device_stats *stats = dev_get_stats(dev);
3638 seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3639 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3640 dev->name, stats->rx_bytes, stats->rx_packets,
3642 stats->rx_dropped + stats->rx_missed_errors,
3643 stats->rx_fifo_errors,
3644 stats->rx_length_errors + stats->rx_over_errors +
3645 stats->rx_crc_errors + stats->rx_frame_errors,
3646 stats->rx_compressed, stats->multicast,
3647 stats->tx_bytes, stats->tx_packets,
3648 stats->tx_errors, stats->tx_dropped,
3649 stats->tx_fifo_errors, stats->collisions,
3650 stats->tx_carrier_errors +
3651 stats->tx_aborted_errors +
3652 stats->tx_window_errors +
3653 stats->tx_heartbeat_errors,
3654 stats->tx_compressed);
3658 * Called from the PROCfs module. This now uses the new arbitrary sized
3659 * /proc/net interface to create /proc/net/dev
3661 static int dev_seq_show(struct seq_file *seq, void *v)
3663 if (v == SEQ_START_TOKEN)
3664 seq_puts(seq, "Inter-| Receive "
3666 " face |bytes packets errs drop fifo frame "
3667 "compressed multicast|bytes packets errs "
3668 "drop fifo colls carrier compressed\n");
3670 dev_seq_printf_stats(seq, v);
3674 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
3676 struct netif_rx_stats *rc = NULL;
3678 while (*pos < nr_cpu_ids)
3679 if (cpu_online(*pos)) {
3680 rc = &per_cpu(netdev_rx_stat, *pos);
3687 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3689 return softnet_get_online(pos);
3692 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3695 return softnet_get_online(pos);
3698 static void softnet_seq_stop(struct seq_file *seq, void *v)
3702 static int softnet_seq_show(struct seq_file *seq, void *v)
3704 struct netif_rx_stats *s = v;
3706 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3707 s->total, s->dropped, s->time_squeeze, 0,
3708 0, 0, 0, 0, /* was fastroute */
3709 s->cpu_collision, s->received_rps);
3713 static const struct seq_operations dev_seq_ops = {
3714 .start = dev_seq_start,
3715 .next = dev_seq_next,
3716 .stop = dev_seq_stop,
3717 .show = dev_seq_show,
3720 static int dev_seq_open(struct inode *inode, struct file *file)
3722 return seq_open_net(inode, file, &dev_seq_ops,
3723 sizeof(struct seq_net_private));
3726 static const struct file_operations dev_seq_fops = {
3727 .owner = THIS_MODULE,
3728 .open = dev_seq_open,
3730 .llseek = seq_lseek,
3731 .release = seq_release_net,
3734 static const struct seq_operations softnet_seq_ops = {
3735 .start = softnet_seq_start,
3736 .next = softnet_seq_next,
3737 .stop = softnet_seq_stop,
3738 .show = softnet_seq_show,
3741 static int softnet_seq_open(struct inode *inode, struct file *file)
3743 return seq_open(file, &softnet_seq_ops);
3746 static const struct file_operations softnet_seq_fops = {
3747 .owner = THIS_MODULE,
3748 .open = softnet_seq_open,
3750 .llseek = seq_lseek,
3751 .release = seq_release,
3754 static void *ptype_get_idx(loff_t pos)
3756 struct packet_type *pt = NULL;
3760 list_for_each_entry_rcu(pt, &ptype_all, list) {
3766 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3767 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3776 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3780 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3783 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3785 struct packet_type *pt;
3786 struct list_head *nxt;
3790 if (v == SEQ_START_TOKEN)
3791 return ptype_get_idx(0);
3794 nxt = pt->list.next;
3795 if (pt->type == htons(ETH_P_ALL)) {
3796 if (nxt != &ptype_all)
3799 nxt = ptype_base[0].next;
3801 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3803 while (nxt == &ptype_base[hash]) {
3804 if (++hash >= PTYPE_HASH_SIZE)
3806 nxt = ptype_base[hash].next;
3809 return list_entry(nxt, struct packet_type, list);
3812 static void ptype_seq_stop(struct seq_file *seq, void *v)
3818 static int ptype_seq_show(struct seq_file *seq, void *v)
3820 struct packet_type *pt = v;
3822 if (v == SEQ_START_TOKEN)
3823 seq_puts(seq, "Type Device Function\n");
3824 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3825 if (pt->type == htons(ETH_P_ALL))
3826 seq_puts(seq, "ALL ");
3828 seq_printf(seq, "%04x", ntohs(pt->type));
3830 seq_printf(seq, " %-8s %pF\n",
3831 pt->dev ? pt->dev->name : "", pt->func);
3837 static const struct seq_operations ptype_seq_ops = {
3838 .start = ptype_seq_start,
3839 .next = ptype_seq_next,
3840 .stop = ptype_seq_stop,
3841 .show = ptype_seq_show,
3844 static int ptype_seq_open(struct inode *inode, struct file *file)
3846 return seq_open_net(inode, file, &ptype_seq_ops,
3847 sizeof(struct seq_net_private));
3850 static const struct file_operations ptype_seq_fops = {
3851 .owner = THIS_MODULE,
3852 .open = ptype_seq_open,
3854 .llseek = seq_lseek,
3855 .release = seq_release_net,
3859 static int __net_init dev_proc_net_init(struct net *net)
3863 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3865 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3867 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3870 if (wext_proc_init(net))
3876 proc_net_remove(net, "ptype");
3878 proc_net_remove(net, "softnet_stat");
3880 proc_net_remove(net, "dev");
3884 static void __net_exit dev_proc_net_exit(struct net *net)
3886 wext_proc_exit(net);
3888 proc_net_remove(net, "ptype");
3889 proc_net_remove(net, "softnet_stat");
3890 proc_net_remove(net, "dev");
3893 static struct pernet_operations __net_initdata dev_proc_ops = {
3894 .init = dev_proc_net_init,
3895 .exit = dev_proc_net_exit,
3898 static int __init dev_proc_init(void)
3900 return register_pernet_subsys(&dev_proc_ops);
3903 #define dev_proc_init() 0
3904 #endif /* CONFIG_PROC_FS */
3908 * netdev_set_master - set up master/slave pair
3909 * @slave: slave device
3910 * @master: new master device
3912 * Changes the master device of the slave. Pass %NULL to break the
3913 * bonding. The caller must hold the RTNL semaphore. On a failure
3914 * a negative errno code is returned. On success the reference counts
3915 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3916 * function returns zero.
3918 int netdev_set_master(struct net_device *slave, struct net_device *master)
3920 struct net_device *old = slave->master;
3930 slave->master = master;
3937 slave->flags |= IFF_SLAVE;
3939 slave->flags &= ~IFF_SLAVE;
3941 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3944 EXPORT_SYMBOL(netdev_set_master);
3946 static void dev_change_rx_flags(struct net_device *dev, int flags)
3948 const struct net_device_ops *ops = dev->netdev_ops;
3950 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3951 ops->ndo_change_rx_flags(dev, flags);
3954 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3956 unsigned short old_flags = dev->flags;
3962 dev->flags |= IFF_PROMISC;
3963 dev->promiscuity += inc;
3964 if (dev->promiscuity == 0) {
3967 * If inc causes overflow, untouch promisc and return error.
3970 dev->flags &= ~IFF_PROMISC;
3972 dev->promiscuity -= inc;
3973 printk(KERN_WARNING "%s: promiscuity touches roof, "
3974 "set promiscuity failed, promiscuity feature "
3975 "of device might be broken.\n", dev->name);
3979 if (dev->flags != old_flags) {
3980 printk(KERN_INFO "device %s %s promiscuous mode\n",
3981 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3983 if (audit_enabled) {
3984 current_uid_gid(&uid, &gid);
3985 audit_log(current->audit_context, GFP_ATOMIC,
3986 AUDIT_ANOM_PROMISCUOUS,
3987 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3988 dev->name, (dev->flags & IFF_PROMISC),
3989 (old_flags & IFF_PROMISC),
3990 audit_get_loginuid(current),
3992 audit_get_sessionid(current));
3995 dev_change_rx_flags(dev, IFF_PROMISC);
4001 * dev_set_promiscuity - update promiscuity count on a device
4005 * Add or remove promiscuity from a device. While the count in the device
4006 * remains above zero the interface remains promiscuous. Once it hits zero
4007 * the device reverts back to normal filtering operation. A negative inc
4008 * value is used to drop promiscuity on the device.
4009 * Return 0 if successful or a negative errno code on error.
4011 int dev_set_promiscuity(struct net_device *dev, int inc)
4013 unsigned short old_flags = dev->flags;
4016 err = __dev_set_promiscuity(dev, inc);
4019 if (dev->flags != old_flags)
4020 dev_set_rx_mode(dev);
4023 EXPORT_SYMBOL(dev_set_promiscuity);
4026 * dev_set_allmulti - update allmulti count on a device
4030 * Add or remove reception of all multicast frames to a device. While the
4031 * count in the device remains above zero the interface remains listening
4032 * to all interfaces. Once it hits zero the device reverts back to normal
4033 * filtering operation. A negative @inc value is used to drop the counter
4034 * when releasing a resource needing all multicasts.
4035 * Return 0 if successful or a negative errno code on error.
4038 int dev_set_allmulti(struct net_device *dev, int inc)
4040 unsigned short old_flags = dev->flags;
4044 dev->flags |= IFF_ALLMULTI;
4045 dev->allmulti += inc;
4046 if (dev->allmulti == 0) {
4049 * If inc causes overflow, untouch allmulti and return error.
4052 dev->flags &= ~IFF_ALLMULTI;
4054 dev->allmulti -= inc;
4055 printk(KERN_WARNING "%s: allmulti touches roof, "
4056 "set allmulti failed, allmulti feature of "
4057 "device might be broken.\n", dev->name);
4061 if (dev->flags ^ old_flags) {
4062 dev_change_rx_flags(dev, IFF_ALLMULTI);
4063 dev_set_rx_mode(dev);
4067 EXPORT_SYMBOL(dev_set_allmulti);
4070 * Upload unicast and multicast address lists to device and
4071 * configure RX filtering. When the device doesn't support unicast
4072 * filtering it is put in promiscuous mode while unicast addresses
4075 void __dev_set_rx_mode(struct net_device *dev)
4077 const struct net_device_ops *ops = dev->netdev_ops;
4079 /* dev_open will call this function so the list will stay sane. */
4080 if (!(dev->flags&IFF_UP))
4083 if (!netif_device_present(dev))
4086 if (ops->ndo_set_rx_mode)
4087 ops->ndo_set_rx_mode(dev);
4089 /* Unicast addresses changes may only happen under the rtnl,
4090 * therefore calling __dev_set_promiscuity here is safe.
4092 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4093 __dev_set_promiscuity(dev, 1);
4094 dev->uc_promisc = 1;
4095 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4096 __dev_set_promiscuity(dev, -1);
4097 dev->uc_promisc = 0;
4100 if (ops->ndo_set_multicast_list)
4101 ops->ndo_set_multicast_list(dev);
4105 void dev_set_rx_mode(struct net_device *dev)
4107 netif_addr_lock_bh(dev);
4108 __dev_set_rx_mode(dev);
4109 netif_addr_unlock_bh(dev);
4113 * dev_get_flags - get flags reported to userspace
4116 * Get the combination of flag bits exported through APIs to userspace.
4118 unsigned dev_get_flags(const struct net_device *dev)
4122 flags = (dev->flags & ~(IFF_PROMISC |
4127 (dev->gflags & (IFF_PROMISC |
4130 if (netif_running(dev)) {
4131 if (netif_oper_up(dev))
4132 flags |= IFF_RUNNING;
4133 if (netif_carrier_ok(dev))
4134 flags |= IFF_LOWER_UP;
4135 if (netif_dormant(dev))
4136 flags |= IFF_DORMANT;
4141 EXPORT_SYMBOL(dev_get_flags);
4143 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4145 int old_flags = dev->flags;
4151 * Set the flags on our device.
4154 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4155 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4157 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4161 * Load in the correct multicast list now the flags have changed.
4164 if ((old_flags ^ flags) & IFF_MULTICAST)
4165 dev_change_rx_flags(dev, IFF_MULTICAST);
4167 dev_set_rx_mode(dev);
4170 * Have we downed the interface. We handle IFF_UP ourselves
4171 * according to user attempts to set it, rather than blindly
4176 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4177 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4180 dev_set_rx_mode(dev);
4183 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4184 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4186 dev->gflags ^= IFF_PROMISC;
4187 dev_set_promiscuity(dev, inc);
4190 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4191 is important. Some (broken) drivers set IFF_PROMISC, when
4192 IFF_ALLMULTI is requested not asking us and not reporting.
4194 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4195 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4197 dev->gflags ^= IFF_ALLMULTI;
4198 dev_set_allmulti(dev, inc);
4204 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4206 unsigned int changes = dev->flags ^ old_flags;
4208 if (changes & IFF_UP) {
4209 if (dev->flags & IFF_UP)
4210 call_netdevice_notifiers(NETDEV_UP, dev);
4212 call_netdevice_notifiers(NETDEV_DOWN, dev);
4215 if (dev->flags & IFF_UP &&
4216 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4217 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4221 * dev_change_flags - change device settings
4223 * @flags: device state flags
4225 * Change settings on device based state flags. The flags are
4226 * in the userspace exported format.
4228 int dev_change_flags(struct net_device *dev, unsigned flags)
4231 int old_flags = dev->flags;
4233 ret = __dev_change_flags(dev, flags);
4237 changes = old_flags ^ dev->flags;
4239 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4241 __dev_notify_flags(dev, old_flags);
4244 EXPORT_SYMBOL(dev_change_flags);
4247 * dev_set_mtu - Change maximum transfer unit
4249 * @new_mtu: new transfer unit
4251 * Change the maximum transfer size of the network device.
4253 int dev_set_mtu(struct net_device *dev, int new_mtu)
4255 const struct net_device_ops *ops = dev->netdev_ops;
4258 if (new_mtu == dev->mtu)
4261 /* MTU must be positive. */
4265 if (!netif_device_present(dev))
4269 if (ops->ndo_change_mtu)
4270 err = ops->ndo_change_mtu(dev, new_mtu);
4274 if (!err && dev->flags & IFF_UP)
4275 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4278 EXPORT_SYMBOL(dev_set_mtu);
4281 * dev_set_mac_address - Change Media Access Control Address
4285 * Change the hardware (MAC) address of the device
4287 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4289 const struct net_device_ops *ops = dev->netdev_ops;
4292 if (!ops->ndo_set_mac_address)
4294 if (sa->sa_family != dev->type)
4296 if (!netif_device_present(dev))
4298 err = ops->ndo_set_mac_address(dev, sa);
4300 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4303 EXPORT_SYMBOL(dev_set_mac_address);
4306 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4308 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4311 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4317 case SIOCGIFFLAGS: /* Get interface flags */
4318 ifr->ifr_flags = (short) dev_get_flags(dev);
4321 case SIOCGIFMETRIC: /* Get the metric on the interface
4322 (currently unused) */
4323 ifr->ifr_metric = 0;
4326 case SIOCGIFMTU: /* Get the MTU of a device */
4327 ifr->ifr_mtu = dev->mtu;
4332 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4334 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4335 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4336 ifr->ifr_hwaddr.sa_family = dev->type;
4344 ifr->ifr_map.mem_start = dev->mem_start;
4345 ifr->ifr_map.mem_end = dev->mem_end;
4346 ifr->ifr_map.base_addr = dev->base_addr;
4347 ifr->ifr_map.irq = dev->irq;
4348 ifr->ifr_map.dma = dev->dma;
4349 ifr->ifr_map.port = dev->if_port;
4353 ifr->ifr_ifindex = dev->ifindex;
4357 ifr->ifr_qlen = dev->tx_queue_len;
4361 /* dev_ioctl() should ensure this case
4373 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4375 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4378 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4379 const struct net_device_ops *ops;
4384 ops = dev->netdev_ops;
4387 case SIOCSIFFLAGS: /* Set interface flags */
4388 return dev_change_flags(dev, ifr->ifr_flags);
4390 case SIOCSIFMETRIC: /* Set the metric on the interface
4391 (currently unused) */
4394 case SIOCSIFMTU: /* Set the MTU of a device */
4395 return dev_set_mtu(dev, ifr->ifr_mtu);
4398 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4400 case SIOCSIFHWBROADCAST:
4401 if (ifr->ifr_hwaddr.sa_family != dev->type)
4403 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4404 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4405 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4409 if (ops->ndo_set_config) {
4410 if (!netif_device_present(dev))
4412 return ops->ndo_set_config(dev, &ifr->ifr_map);
4417 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4418 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4420 if (!netif_device_present(dev))
4422 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4425 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4426 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4428 if (!netif_device_present(dev))
4430 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4433 if (ifr->ifr_qlen < 0)
4435 dev->tx_queue_len = ifr->ifr_qlen;
4439 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4440 return dev_change_name(dev, ifr->ifr_newname);
4443 * Unknown or private ioctl
4446 if ((cmd >= SIOCDEVPRIVATE &&
4447 cmd <= SIOCDEVPRIVATE + 15) ||
4448 cmd == SIOCBONDENSLAVE ||
4449 cmd == SIOCBONDRELEASE ||
4450 cmd == SIOCBONDSETHWADDR ||
4451 cmd == SIOCBONDSLAVEINFOQUERY ||
4452 cmd == SIOCBONDINFOQUERY ||
4453 cmd == SIOCBONDCHANGEACTIVE ||
4454 cmd == SIOCGMIIPHY ||
4455 cmd == SIOCGMIIREG ||
4456 cmd == SIOCSMIIREG ||
4457 cmd == SIOCBRADDIF ||
4458 cmd == SIOCBRDELIF ||
4459 cmd == SIOCSHWTSTAMP ||
4460 cmd == SIOCWANDEV) {
4462 if (ops->ndo_do_ioctl) {
4463 if (netif_device_present(dev))
4464 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4476 * This function handles all "interface"-type I/O control requests. The actual
4477 * 'doing' part of this is dev_ifsioc above.
4481 * dev_ioctl - network device ioctl
4482 * @net: the applicable net namespace
4483 * @cmd: command to issue
4484 * @arg: pointer to a struct ifreq in user space
4486 * Issue ioctl functions to devices. This is normally called by the
4487 * user space syscall interfaces but can sometimes be useful for
4488 * other purposes. The return value is the return from the syscall if
4489 * positive or a negative errno code on error.
4492 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4498 /* One special case: SIOCGIFCONF takes ifconf argument
4499 and requires shared lock, because it sleeps writing
4503 if (cmd == SIOCGIFCONF) {
4505 ret = dev_ifconf(net, (char __user *) arg);
4509 if (cmd == SIOCGIFNAME)
4510 return dev_ifname(net, (struct ifreq __user *)arg);
4512 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4515 ifr.ifr_name[IFNAMSIZ-1] = 0;
4517 colon = strchr(ifr.ifr_name, ':');
4522 * See which interface the caller is talking about.
4527 * These ioctl calls:
4528 * - can be done by all.
4529 * - atomic and do not require locking.
4540 dev_load(net, ifr.ifr_name);
4542 ret = dev_ifsioc_locked(net, &ifr, cmd);
4547 if (copy_to_user(arg, &ifr,
4548 sizeof(struct ifreq)))
4554 dev_load(net, ifr.ifr_name);
4556 ret = dev_ethtool(net, &ifr);
4561 if (copy_to_user(arg, &ifr,
4562 sizeof(struct ifreq)))
4568 * These ioctl calls:
4569 * - require superuser power.
4570 * - require strict serialization.
4576 if (!capable(CAP_NET_ADMIN))
4578 dev_load(net, ifr.ifr_name);
4580 ret = dev_ifsioc(net, &ifr, cmd);
4585 if (copy_to_user(arg, &ifr,
4586 sizeof(struct ifreq)))
4592 * These ioctl calls:
4593 * - require superuser power.
4594 * - require strict serialization.
4595 * - do not return a value
4605 case SIOCSIFHWBROADCAST:
4608 case SIOCBONDENSLAVE:
4609 case SIOCBONDRELEASE:
4610 case SIOCBONDSETHWADDR:
4611 case SIOCBONDCHANGEACTIVE:
4615 if (!capable(CAP_NET_ADMIN))
4618 case SIOCBONDSLAVEINFOQUERY:
4619 case SIOCBONDINFOQUERY:
4620 dev_load(net, ifr.ifr_name);
4622 ret = dev_ifsioc(net, &ifr, cmd);
4627 /* Get the per device memory space. We can add this but
4628 * currently do not support it */
4630 /* Set the per device memory buffer space.
4631 * Not applicable in our case */
4636 * Unknown or private ioctl.
4639 if (cmd == SIOCWANDEV ||
4640 (cmd >= SIOCDEVPRIVATE &&
4641 cmd <= SIOCDEVPRIVATE + 15)) {
4642 dev_load(net, ifr.ifr_name);
4644 ret = dev_ifsioc(net, &ifr, cmd);
4646 if (!ret && copy_to_user(arg, &ifr,
4647 sizeof(struct ifreq)))
4651 /* Take care of Wireless Extensions */
4652 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4653 return wext_handle_ioctl(net, &ifr, cmd, arg);
4660 * dev_new_index - allocate an ifindex
4661 * @net: the applicable net namespace
4663 * Returns a suitable unique value for a new device interface
4664 * number. The caller must hold the rtnl semaphore or the
4665 * dev_base_lock to be sure it remains unique.
4667 static int dev_new_index(struct net *net)
4673 if (!__dev_get_by_index(net, ifindex))
4678 /* Delayed registration/unregisteration */
4679 static LIST_HEAD(net_todo_list);
4681 static void net_set_todo(struct net_device *dev)
4683 list_add_tail(&dev->todo_list, &net_todo_list);
4686 static void rollback_registered_many(struct list_head *head)
4688 struct net_device *dev, *tmp;
4690 BUG_ON(dev_boot_phase);
4693 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4694 /* Some devices call without registering
4695 * for initialization unwind. Remove those
4696 * devices and proceed with the remaining.
4698 if (dev->reg_state == NETREG_UNINITIALIZED) {
4699 pr_debug("unregister_netdevice: device %s/%p never "
4700 "was registered\n", dev->name, dev);
4703 list_del(&dev->unreg_list);
4707 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4709 /* If device is running, close it first. */
4712 /* And unlink it from device chain. */
4713 unlist_netdevice(dev);
4715 dev->reg_state = NETREG_UNREGISTERING;
4720 list_for_each_entry(dev, head, unreg_list) {
4721 /* Shutdown queueing discipline. */
4725 /* Notify protocols, that we are about to destroy
4726 this device. They should clean all the things.
4728 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4730 if (!dev->rtnl_link_ops ||
4731 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4732 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4735 * Flush the unicast and multicast chains
4740 if (dev->netdev_ops->ndo_uninit)
4741 dev->netdev_ops->ndo_uninit(dev);
4743 /* Notifier chain MUST detach us from master device. */
4744 WARN_ON(dev->master);
4746 /* Remove entries from kobject tree */
4747 netdev_unregister_kobject(dev);
4750 /* Process any work delayed until the end of the batch */
4751 dev = list_first_entry(head, struct net_device, unreg_list);
4752 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4756 list_for_each_entry(dev, head, unreg_list)
4760 static void rollback_registered(struct net_device *dev)
4764 list_add(&dev->unreg_list, &single);
4765 rollback_registered_many(&single);
4768 static void __netdev_init_queue_locks_one(struct net_device *dev,
4769 struct netdev_queue *dev_queue,
4772 spin_lock_init(&dev_queue->_xmit_lock);
4773 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4774 dev_queue->xmit_lock_owner = -1;
4777 static void netdev_init_queue_locks(struct net_device *dev)
4779 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4780 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4783 unsigned long netdev_fix_features(unsigned long features, const char *name)
4785 /* Fix illegal SG+CSUM combinations. */
4786 if ((features & NETIF_F_SG) &&
4787 !(features & NETIF_F_ALL_CSUM)) {
4789 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4790 "checksum feature.\n", name);
4791 features &= ~NETIF_F_SG;
4794 /* TSO requires that SG is present as well. */
4795 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4797 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4798 "SG feature.\n", name);
4799 features &= ~NETIF_F_TSO;
4802 if (features & NETIF_F_UFO) {
4803 if (!(features & NETIF_F_GEN_CSUM)) {
4805 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4806 "since no NETIF_F_HW_CSUM feature.\n",
4808 features &= ~NETIF_F_UFO;
4811 if (!(features & NETIF_F_SG)) {
4813 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4814 "since no NETIF_F_SG feature.\n", name);
4815 features &= ~NETIF_F_UFO;
4821 EXPORT_SYMBOL(netdev_fix_features);
4824 * netif_stacked_transfer_operstate - transfer operstate
4825 * @rootdev: the root or lower level device to transfer state from
4826 * @dev: the device to transfer operstate to
4828 * Transfer operational state from root to device. This is normally
4829 * called when a stacking relationship exists between the root
4830 * device and the device(a leaf device).
4832 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4833 struct net_device *dev)
4835 if (rootdev->operstate == IF_OPER_DORMANT)
4836 netif_dormant_on(dev);
4838 netif_dormant_off(dev);
4840 if (netif_carrier_ok(rootdev)) {
4841 if (!netif_carrier_ok(dev))
4842 netif_carrier_on(dev);
4844 if (netif_carrier_ok(dev))
4845 netif_carrier_off(dev);
4848 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4851 * register_netdevice - register a network device
4852 * @dev: device to register
4854 * Take a completed network device structure and add it to the kernel
4855 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4856 * chain. 0 is returned on success. A negative errno code is returned
4857 * on a failure to set up the device, or if the name is a duplicate.
4859 * Callers must hold the rtnl semaphore. You may want
4860 * register_netdev() instead of this.
4863 * The locking appears insufficient to guarantee two parallel registers
4864 * will not get the same name.
4867 int register_netdevice(struct net_device *dev)
4870 struct net *net = dev_net(dev);
4872 BUG_ON(dev_boot_phase);
4877 /* When net_device's are persistent, this will be fatal. */
4878 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4881 spin_lock_init(&dev->addr_list_lock);
4882 netdev_set_addr_lockdep_class(dev);
4883 netdev_init_queue_locks(dev);
4888 if (!dev->num_rx_queues) {
4890 * Allocate a single RX queue if driver never called
4894 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
4900 dev->_rx->first = dev->_rx;
4901 atomic_set(&dev->_rx->count, 1);
4902 dev->num_rx_queues = 1;
4905 /* Init, if this function is available */
4906 if (dev->netdev_ops->ndo_init) {
4907 ret = dev->netdev_ops->ndo_init(dev);
4915 ret = dev_get_valid_name(net, dev->name, dev->name, 0);
4919 dev->ifindex = dev_new_index(net);
4920 if (dev->iflink == -1)
4921 dev->iflink = dev->ifindex;
4923 /* Fix illegal checksum combinations */
4924 if ((dev->features & NETIF_F_HW_CSUM) &&
4925 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4926 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4928 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4931 if ((dev->features & NETIF_F_NO_CSUM) &&
4932 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4933 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4935 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4938 dev->features = netdev_fix_features(dev->features, dev->name);
4940 /* Enable software GSO if SG is supported. */
4941 if (dev->features & NETIF_F_SG)
4942 dev->features |= NETIF_F_GSO;
4944 netdev_initialize_kobject(dev);
4946 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
4947 ret = notifier_to_errno(ret);
4951 ret = netdev_register_kobject(dev);
4954 dev->reg_state = NETREG_REGISTERED;
4957 * Default initial state at registry is that the
4958 * device is present.
4961 set_bit(__LINK_STATE_PRESENT, &dev->state);
4963 dev_init_scheduler(dev);
4965 list_netdevice(dev);
4967 /* Notify protocols, that a new device appeared. */
4968 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4969 ret = notifier_to_errno(ret);
4971 rollback_registered(dev);
4972 dev->reg_state = NETREG_UNREGISTERED;
4975 * Prevent userspace races by waiting until the network
4976 * device is fully setup before sending notifications.
4978 if (!dev->rtnl_link_ops ||
4979 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4980 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
4986 if (dev->netdev_ops->ndo_uninit)
4987 dev->netdev_ops->ndo_uninit(dev);
4990 EXPORT_SYMBOL(register_netdevice);
4993 * init_dummy_netdev - init a dummy network device for NAPI
4994 * @dev: device to init
4996 * This takes a network device structure and initialize the minimum
4997 * amount of fields so it can be used to schedule NAPI polls without
4998 * registering a full blown interface. This is to be used by drivers
4999 * that need to tie several hardware interfaces to a single NAPI
5000 * poll scheduler due to HW limitations.
5002 int init_dummy_netdev(struct net_device *dev)
5004 /* Clear everything. Note we don't initialize spinlocks
5005 * are they aren't supposed to be taken by any of the
5006 * NAPI code and this dummy netdev is supposed to be
5007 * only ever used for NAPI polls
5009 memset(dev, 0, sizeof(struct net_device));
5011 /* make sure we BUG if trying to hit standard
5012 * register/unregister code path
5014 dev->reg_state = NETREG_DUMMY;
5016 /* initialize the ref count */
5017 atomic_set(&dev->refcnt, 1);
5019 /* NAPI wants this */
5020 INIT_LIST_HEAD(&dev->napi_list);
5022 /* a dummy interface is started by default */
5023 set_bit(__LINK_STATE_PRESENT, &dev->state);
5024 set_bit(__LINK_STATE_START, &dev->state);
5028 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5032 * register_netdev - register a network device
5033 * @dev: device to register
5035 * Take a completed network device structure and add it to the kernel
5036 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5037 * chain. 0 is returned on success. A negative errno code is returned
5038 * on a failure to set up the device, or if the name is a duplicate.
5040 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5041 * and expands the device name if you passed a format string to
5044 int register_netdev(struct net_device *dev)
5051 * If the name is a format string the caller wants us to do a
5054 if (strchr(dev->name, '%')) {
5055 err = dev_alloc_name(dev, dev->name);
5060 err = register_netdevice(dev);
5065 EXPORT_SYMBOL(register_netdev);
5068 * netdev_wait_allrefs - wait until all references are gone.
5070 * This is called when unregistering network devices.
5072 * Any protocol or device that holds a reference should register
5073 * for netdevice notification, and cleanup and put back the
5074 * reference if they receive an UNREGISTER event.
5075 * We can get stuck here if buggy protocols don't correctly
5078 static void netdev_wait_allrefs(struct net_device *dev)
5080 unsigned long rebroadcast_time, warning_time;
5082 linkwatch_forget_dev(dev);
5084 rebroadcast_time = warning_time = jiffies;
5085 while (atomic_read(&dev->refcnt) != 0) {
5086 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5089 /* Rebroadcast unregister notification */
5090 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5091 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5092 * should have already handle it the first time */
5094 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5096 /* We must not have linkwatch events
5097 * pending on unregister. If this
5098 * happens, we simply run the queue
5099 * unscheduled, resulting in a noop
5102 linkwatch_run_queue();
5107 rebroadcast_time = jiffies;
5112 if (time_after(jiffies, warning_time + 10 * HZ)) {
5113 printk(KERN_EMERG "unregister_netdevice: "
5114 "waiting for %s to become free. Usage "
5116 dev->name, atomic_read(&dev->refcnt));
5117 warning_time = jiffies;
5126 * register_netdevice(x1);
5127 * register_netdevice(x2);
5129 * unregister_netdevice(y1);
5130 * unregister_netdevice(y2);
5136 * We are invoked by rtnl_unlock().
5137 * This allows us to deal with problems:
5138 * 1) We can delete sysfs objects which invoke hotplug
5139 * without deadlocking with linkwatch via keventd.
5140 * 2) Since we run with the RTNL semaphore not held, we can sleep
5141 * safely in order to wait for the netdev refcnt to drop to zero.
5143 * We must not return until all unregister events added during
5144 * the interval the lock was held have been completed.
5146 void netdev_run_todo(void)
5148 struct list_head list;
5150 /* Snapshot list, allow later requests */
5151 list_replace_init(&net_todo_list, &list);
5155 while (!list_empty(&list)) {
5156 struct net_device *dev
5157 = list_first_entry(&list, struct net_device, todo_list);
5158 list_del(&dev->todo_list);
5160 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5161 printk(KERN_ERR "network todo '%s' but state %d\n",
5162 dev->name, dev->reg_state);
5167 dev->reg_state = NETREG_UNREGISTERED;
5169 on_each_cpu(flush_backlog, dev, 1);
5171 netdev_wait_allrefs(dev);
5174 BUG_ON(atomic_read(&dev->refcnt));
5175 WARN_ON(dev->ip_ptr);
5176 WARN_ON(dev->ip6_ptr);
5177 WARN_ON(dev->dn_ptr);
5179 if (dev->destructor)
5180 dev->destructor(dev);
5182 /* Free network device */
5183 kobject_put(&dev->dev.kobj);
5188 * dev_txq_stats_fold - fold tx_queues stats
5189 * @dev: device to get statistics from
5190 * @stats: struct net_device_stats to hold results
5192 void dev_txq_stats_fold(const struct net_device *dev,
5193 struct net_device_stats *stats)
5195 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5197 struct netdev_queue *txq;
5199 for (i = 0; i < dev->num_tx_queues; i++) {
5200 txq = netdev_get_tx_queue(dev, i);
5201 tx_bytes += txq->tx_bytes;
5202 tx_packets += txq->tx_packets;
5203 tx_dropped += txq->tx_dropped;
5205 if (tx_bytes || tx_packets || tx_dropped) {
5206 stats->tx_bytes = tx_bytes;
5207 stats->tx_packets = tx_packets;
5208 stats->tx_dropped = tx_dropped;
5211 EXPORT_SYMBOL(dev_txq_stats_fold);
5214 * dev_get_stats - get network device statistics
5215 * @dev: device to get statistics from
5217 * Get network statistics from device. The device driver may provide
5218 * its own method by setting dev->netdev_ops->get_stats; otherwise
5219 * the internal statistics structure is used.
5221 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5223 const struct net_device_ops *ops = dev->netdev_ops;
5225 if (ops->ndo_get_stats)
5226 return ops->ndo_get_stats(dev);
5228 dev_txq_stats_fold(dev, &dev->stats);
5231 EXPORT_SYMBOL(dev_get_stats);
5233 static void netdev_init_one_queue(struct net_device *dev,
5234 struct netdev_queue *queue,
5240 static void netdev_init_queues(struct net_device *dev)
5242 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5243 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5244 spin_lock_init(&dev->tx_global_lock);
5248 * alloc_netdev_mq - allocate network device
5249 * @sizeof_priv: size of private data to allocate space for
5250 * @name: device name format string
5251 * @setup: callback to initialize device
5252 * @queue_count: the number of subqueues to allocate
5254 * Allocates a struct net_device with private data area for driver use
5255 * and performs basic initialization. Also allocates subquue structs
5256 * for each queue on the device at the end of the netdevice.
5258 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5259 void (*setup)(struct net_device *), unsigned int queue_count)
5261 struct netdev_queue *tx;
5262 struct net_device *dev;
5264 struct net_device *p;
5266 struct netdev_rx_queue *rx;
5270 BUG_ON(strlen(name) >= sizeof(dev->name));
5272 alloc_size = sizeof(struct net_device);
5274 /* ensure 32-byte alignment of private area */
5275 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5276 alloc_size += sizeof_priv;
5278 /* ensure 32-byte alignment of whole construct */
5279 alloc_size += NETDEV_ALIGN - 1;
5281 p = kzalloc(alloc_size, GFP_KERNEL);
5283 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5287 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5289 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5295 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5297 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5302 atomic_set(&rx->count, queue_count);
5305 * Set a pointer to first element in the array which holds the
5308 for (i = 0; i < queue_count; i++)
5312 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5313 dev->padded = (char *)dev - (char *)p;
5315 if (dev_addr_init(dev))
5321 dev_net_set(dev, &init_net);
5324 dev->num_tx_queues = queue_count;
5325 dev->real_num_tx_queues = queue_count;
5329 dev->num_rx_queues = queue_count;
5332 dev->gso_max_size = GSO_MAX_SIZE;
5334 netdev_init_queues(dev);
5336 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5337 dev->ethtool_ntuple_list.count = 0;
5338 INIT_LIST_HEAD(&dev->napi_list);
5339 INIT_LIST_HEAD(&dev->unreg_list);
5340 INIT_LIST_HEAD(&dev->link_watch_list);
5341 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5343 strcpy(dev->name, name);
5356 EXPORT_SYMBOL(alloc_netdev_mq);
5359 * free_netdev - free network device
5362 * This function does the last stage of destroying an allocated device
5363 * interface. The reference to the device object is released.
5364 * If this is the last reference then it will be freed.
5366 void free_netdev(struct net_device *dev)
5368 struct napi_struct *p, *n;
5370 release_net(dev_net(dev));
5374 /* Flush device addresses */
5375 dev_addr_flush(dev);
5377 /* Clear ethtool n-tuple list */
5378 ethtool_ntuple_flush(dev);
5380 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5383 /* Compatibility with error handling in drivers */
5384 if (dev->reg_state == NETREG_UNINITIALIZED) {
5385 kfree((char *)dev - dev->padded);
5389 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5390 dev->reg_state = NETREG_RELEASED;
5392 /* will free via device release */
5393 put_device(&dev->dev);
5395 EXPORT_SYMBOL(free_netdev);
5398 * synchronize_net - Synchronize with packet receive processing
5400 * Wait for packets currently being received to be done.
5401 * Does not block later packets from starting.
5403 void synchronize_net(void)
5408 EXPORT_SYMBOL(synchronize_net);
5411 * unregister_netdevice_queue - remove device from the kernel
5415 * This function shuts down a device interface and removes it
5416 * from the kernel tables.
5417 * If head not NULL, device is queued to be unregistered later.
5419 * Callers must hold the rtnl semaphore. You may want
5420 * unregister_netdev() instead of this.
5423 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5428 list_move_tail(&dev->unreg_list, head);
5430 rollback_registered(dev);
5431 /* Finish processing unregister after unlock */
5435 EXPORT_SYMBOL(unregister_netdevice_queue);
5438 * unregister_netdevice_many - unregister many devices
5439 * @head: list of devices
5441 void unregister_netdevice_many(struct list_head *head)
5443 struct net_device *dev;
5445 if (!list_empty(head)) {
5446 rollback_registered_many(head);
5447 list_for_each_entry(dev, head, unreg_list)
5451 EXPORT_SYMBOL(unregister_netdevice_many);
5454 * unregister_netdev - remove device from the kernel
5457 * This function shuts down a device interface and removes it
5458 * from the kernel tables.
5460 * This is just a wrapper for unregister_netdevice that takes
5461 * the rtnl semaphore. In general you want to use this and not
5462 * unregister_netdevice.
5464 void unregister_netdev(struct net_device *dev)
5467 unregister_netdevice(dev);
5470 EXPORT_SYMBOL(unregister_netdev);
5473 * dev_change_net_namespace - move device to different nethost namespace
5475 * @net: network namespace
5476 * @pat: If not NULL name pattern to try if the current device name
5477 * is already taken in the destination network namespace.
5479 * This function shuts down a device interface and moves it
5480 * to a new network namespace. On success 0 is returned, on
5481 * a failure a netagive errno code is returned.
5483 * Callers must hold the rtnl semaphore.
5486 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5492 /* Don't allow namespace local devices to be moved. */
5494 if (dev->features & NETIF_F_NETNS_LOCAL)
5498 /* Don't allow real devices to be moved when sysfs
5502 if (dev->dev.parent)
5506 /* Ensure the device has been registrered */
5508 if (dev->reg_state != NETREG_REGISTERED)
5511 /* Get out if there is nothing todo */
5513 if (net_eq(dev_net(dev), net))
5516 /* Pick the destination device name, and ensure
5517 * we can use it in the destination network namespace.
5520 if (__dev_get_by_name(net, dev->name)) {
5521 /* We get here if we can't use the current device name */
5524 if (dev_get_valid_name(net, pat, dev->name, 1))
5529 * And now a mini version of register_netdevice unregister_netdevice.
5532 /* If device is running close it first. */
5535 /* And unlink it from device chain */
5537 unlist_netdevice(dev);
5541 /* Shutdown queueing discipline. */
5544 /* Notify protocols, that we are about to destroy
5545 this device. They should clean all the things.
5547 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5548 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5551 * Flush the unicast and multicast chains
5556 netdev_unregister_kobject(dev);
5558 /* Actually switch the network namespace */
5559 dev_net_set(dev, net);
5561 /* If there is an ifindex conflict assign a new one */
5562 if (__dev_get_by_index(net, dev->ifindex)) {
5563 int iflink = (dev->iflink == dev->ifindex);
5564 dev->ifindex = dev_new_index(net);
5566 dev->iflink = dev->ifindex;
5569 /* Fixup kobjects */
5570 err = netdev_register_kobject(dev);
5573 /* Add the device back in the hashes */
5574 list_netdevice(dev);
5576 /* Notify protocols, that a new device appeared. */
5577 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5580 * Prevent userspace races by waiting until the network
5581 * device is fully setup before sending notifications.
5583 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5590 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5592 static int dev_cpu_callback(struct notifier_block *nfb,
5593 unsigned long action,
5596 struct sk_buff **list_skb;
5597 struct Qdisc **list_net;
5598 struct sk_buff *skb;
5599 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5600 struct softnet_data *sd, *oldsd;
5602 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5605 local_irq_disable();
5606 cpu = smp_processor_id();
5607 sd = &per_cpu(softnet_data, cpu);
5608 oldsd = &per_cpu(softnet_data, oldcpu);
5610 /* Find end of our completion_queue. */
5611 list_skb = &sd->completion_queue;
5613 list_skb = &(*list_skb)->next;
5614 /* Append completion queue from offline CPU. */
5615 *list_skb = oldsd->completion_queue;
5616 oldsd->completion_queue = NULL;
5618 /* Find end of our output_queue. */
5619 list_net = &sd->output_queue;
5621 list_net = &(*list_net)->next_sched;
5622 /* Append output queue from offline CPU. */
5623 *list_net = oldsd->output_queue;
5624 oldsd->output_queue = NULL;
5626 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5629 /* Process offline CPU's input_pkt_queue */
5630 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5632 input_queue_head_incr(oldsd);
5640 * netdev_increment_features - increment feature set by one
5641 * @all: current feature set
5642 * @one: new feature set
5643 * @mask: mask feature set
5645 * Computes a new feature set after adding a device with feature set
5646 * @one to the master device with current feature set @all. Will not
5647 * enable anything that is off in @mask. Returns the new feature set.
5649 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5652 /* If device needs checksumming, downgrade to it. */
5653 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5654 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5655 else if (mask & NETIF_F_ALL_CSUM) {
5656 /* If one device supports v4/v6 checksumming, set for all. */
5657 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5658 !(all & NETIF_F_GEN_CSUM)) {
5659 all &= ~NETIF_F_ALL_CSUM;
5660 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5663 /* If one device supports hw checksumming, set for all. */
5664 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5665 all &= ~NETIF_F_ALL_CSUM;
5666 all |= NETIF_F_HW_CSUM;
5670 one |= NETIF_F_ALL_CSUM;
5672 one |= all & NETIF_F_ONE_FOR_ALL;
5673 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5674 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5678 EXPORT_SYMBOL(netdev_increment_features);
5680 static struct hlist_head *netdev_create_hash(void)
5683 struct hlist_head *hash;
5685 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5687 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5688 INIT_HLIST_HEAD(&hash[i]);
5693 /* Initialize per network namespace state */
5694 static int __net_init netdev_init(struct net *net)
5696 INIT_LIST_HEAD(&net->dev_base_head);
5698 net->dev_name_head = netdev_create_hash();
5699 if (net->dev_name_head == NULL)
5702 net->dev_index_head = netdev_create_hash();
5703 if (net->dev_index_head == NULL)
5709 kfree(net->dev_name_head);
5715 * netdev_drivername - network driver for the device
5716 * @dev: network device
5717 * @buffer: buffer for resulting name
5718 * @len: size of buffer
5720 * Determine network driver for device.
5722 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5724 const struct device_driver *driver;
5725 const struct device *parent;
5727 if (len <= 0 || !buffer)
5731 parent = dev->dev.parent;
5736 driver = parent->driver;
5737 if (driver && driver->name)
5738 strlcpy(buffer, driver->name, len);
5742 static void __net_exit netdev_exit(struct net *net)
5744 kfree(net->dev_name_head);
5745 kfree(net->dev_index_head);
5748 static struct pernet_operations __net_initdata netdev_net_ops = {
5749 .init = netdev_init,
5750 .exit = netdev_exit,
5753 static void __net_exit default_device_exit(struct net *net)
5755 struct net_device *dev, *aux;
5757 * Push all migratable network devices back to the
5758 * initial network namespace
5761 for_each_netdev_safe(net, dev, aux) {
5763 char fb_name[IFNAMSIZ];
5765 /* Ignore unmoveable devices (i.e. loopback) */
5766 if (dev->features & NETIF_F_NETNS_LOCAL)
5769 /* Leave virtual devices for the generic cleanup */
5770 if (dev->rtnl_link_ops)
5773 /* Push remaing network devices to init_net */
5774 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5775 err = dev_change_net_namespace(dev, &init_net, fb_name);
5777 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5778 __func__, dev->name, err);
5785 static void __net_exit default_device_exit_batch(struct list_head *net_list)
5787 /* At exit all network devices most be removed from a network
5788 * namespace. Do this in the reverse order of registeration.
5789 * Do this across as many network namespaces as possible to
5790 * improve batching efficiency.
5792 struct net_device *dev;
5794 LIST_HEAD(dev_kill_list);
5797 list_for_each_entry(net, net_list, exit_list) {
5798 for_each_netdev_reverse(net, dev) {
5799 if (dev->rtnl_link_ops)
5800 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
5802 unregister_netdevice_queue(dev, &dev_kill_list);
5805 unregister_netdevice_many(&dev_kill_list);
5809 static struct pernet_operations __net_initdata default_device_ops = {
5810 .exit = default_device_exit,
5811 .exit_batch = default_device_exit_batch,
5815 * Initialize the DEV module. At boot time this walks the device list and
5816 * unhooks any devices that fail to initialise (normally hardware not
5817 * present) and leaves us with a valid list of present and active devices.
5822 * This is called single threaded during boot, so no need
5823 * to take the rtnl semaphore.
5825 static int __init net_dev_init(void)
5827 int i, rc = -ENOMEM;
5829 BUG_ON(!dev_boot_phase);
5831 if (dev_proc_init())
5834 if (netdev_kobject_init())
5837 INIT_LIST_HEAD(&ptype_all);
5838 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5839 INIT_LIST_HEAD(&ptype_base[i]);
5841 if (register_pernet_subsys(&netdev_net_ops))
5845 * Initialise the packet receive queues.
5848 for_each_possible_cpu(i) {
5849 struct softnet_data *sd = &per_cpu(softnet_data, i);
5851 skb_queue_head_init(&sd->input_pkt_queue);
5852 sd->completion_queue = NULL;
5853 INIT_LIST_HEAD(&sd->poll_list);
5856 sd->csd.func = rps_trigger_softirq;
5862 sd->backlog.poll = process_backlog;
5863 sd->backlog.weight = weight_p;
5864 sd->backlog.gro_list = NULL;
5865 sd->backlog.gro_count = 0;
5870 /* The loopback device is special if any other network devices
5871 * is present in a network namespace the loopback device must
5872 * be present. Since we now dynamically allocate and free the
5873 * loopback device ensure this invariant is maintained by
5874 * keeping the loopback device as the first device on the
5875 * list of network devices. Ensuring the loopback devices
5876 * is the first device that appears and the last network device
5879 if (register_pernet_device(&loopback_net_ops))
5882 if (register_pernet_device(&default_device_ops))
5885 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5886 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5888 hotcpu_notifier(dev_cpu_callback, 0);
5896 subsys_initcall(net_dev_init);
5898 static int __init initialize_hashrnd(void)
5900 get_random_bytes(&hashrnd, sizeof(hashrnd));
5904 late_initcall_sync(initialize_hashrnd);