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);
1905 if (netif_needs_gso(dev, skb)) {
1906 if (unlikely(dev_gso_segment(skb)))
1913 * If device doesnt need skb->dst, release it right now while
1914 * its hot in this cpu cache
1916 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1919 skb_orphan_try(skb);
1920 rc = ops->ndo_start_xmit(skb, dev);
1921 if (rc == NETDEV_TX_OK)
1922 txq_trans_update(txq);
1928 struct sk_buff *nskb = skb->next;
1930 skb->next = nskb->next;
1934 * If device doesnt need nskb->dst, release it right now while
1935 * its hot in this cpu cache
1937 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1940 rc = ops->ndo_start_xmit(nskb, dev);
1941 if (unlikely(rc != NETDEV_TX_OK)) {
1942 if (rc & ~NETDEV_TX_MASK)
1943 goto out_kfree_gso_skb;
1944 nskb->next = skb->next;
1948 txq_trans_update(txq);
1949 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1950 return NETDEV_TX_BUSY;
1951 } while (skb->next);
1954 if (likely(skb->next == NULL))
1955 skb->destructor = DEV_GSO_CB(skb)->destructor;
1961 static u32 hashrnd __read_mostly;
1963 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1967 if (skb_rx_queue_recorded(skb)) {
1968 hash = skb_get_rx_queue(skb);
1969 while (unlikely(hash >= dev->real_num_tx_queues))
1970 hash -= dev->real_num_tx_queues;
1974 if (skb->sk && skb->sk->sk_hash)
1975 hash = skb->sk->sk_hash;
1977 hash = (__force u16) skb->protocol;
1979 hash = jhash_1word(hash, hashrnd);
1981 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1983 EXPORT_SYMBOL(skb_tx_hash);
1985 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
1987 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
1988 if (net_ratelimit()) {
1989 pr_warning("%s selects TX queue %d, but "
1990 "real number of TX queues is %d\n",
1991 dev->name, queue_index, dev->real_num_tx_queues);
1998 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
1999 struct sk_buff *skb)
2002 struct sock *sk = skb->sk;
2004 if (sk_tx_queue_recorded(sk)) {
2005 queue_index = sk_tx_queue_get(sk);
2007 const struct net_device_ops *ops = dev->netdev_ops;
2009 if (ops->ndo_select_queue) {
2010 queue_index = ops->ndo_select_queue(dev, skb);
2011 queue_index = dev_cap_txqueue(dev, queue_index);
2014 if (dev->real_num_tx_queues > 1)
2015 queue_index = skb_tx_hash(dev, skb);
2018 struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
2020 if (dst && skb_dst(skb) == dst)
2021 sk_tx_queue_set(sk, queue_index);
2026 skb_set_queue_mapping(skb, queue_index);
2027 return netdev_get_tx_queue(dev, queue_index);
2030 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2031 struct net_device *dev,
2032 struct netdev_queue *txq)
2034 spinlock_t *root_lock = qdisc_lock(q);
2037 spin_lock(root_lock);
2038 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2041 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2042 !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
2044 * This is a work-conserving queue; there are no old skbs
2045 * waiting to be sent out; and the qdisc is not running -
2046 * xmit the skb directly.
2048 __qdisc_update_bstats(q, skb->len);
2049 if (sch_direct_xmit(skb, q, dev, txq, root_lock))
2052 clear_bit(__QDISC_STATE_RUNNING, &q->state);
2054 rc = NET_XMIT_SUCCESS;
2056 rc = qdisc_enqueue_root(skb, q);
2059 spin_unlock(root_lock);
2065 * Returns true if either:
2066 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2067 * 2. skb is fragmented and the device does not support SG, or if
2068 * at least one of fragments is in highmem and device does not
2069 * support DMA from it.
2071 static inline int skb_needs_linearize(struct sk_buff *skb,
2072 struct net_device *dev)
2074 return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
2075 (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
2076 illegal_highdma(dev, skb)));
2080 * dev_queue_xmit - transmit a buffer
2081 * @skb: buffer to transmit
2083 * Queue a buffer for transmission to a network device. The caller must
2084 * have set the device and priority and built the buffer before calling
2085 * this function. The function can be called from an interrupt.
2087 * A negative errno code is returned on a failure. A success does not
2088 * guarantee the frame will be transmitted as it may be dropped due
2089 * to congestion or traffic shaping.
2091 * -----------------------------------------------------------------------------------
2092 * I notice this method can also return errors from the queue disciplines,
2093 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2096 * Regardless of the return value, the skb is consumed, so it is currently
2097 * difficult to retry a send to this method. (You can bump the ref count
2098 * before sending to hold a reference for retry if you are careful.)
2100 * When calling this method, interrupts MUST be enabled. This is because
2101 * the BH enable code must have IRQs enabled so that it will not deadlock.
2104 int dev_queue_xmit(struct sk_buff *skb)
2106 struct net_device *dev = skb->dev;
2107 struct netdev_queue *txq;
2111 /* GSO will handle the following emulations directly. */
2112 if (netif_needs_gso(dev, skb))
2115 /* Convert a paged skb to linear, if required */
2116 if (skb_needs_linearize(skb, dev) && __skb_linearize(skb))
2119 /* If packet is not checksummed and device does not support
2120 * checksumming for this protocol, complete checksumming here.
2122 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2123 skb_set_transport_header(skb, skb->csum_start -
2125 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
2130 /* Disable soft irqs for various locks below. Also
2131 * stops preemption for RCU.
2135 txq = dev_pick_tx(dev, skb);
2136 q = rcu_dereference_bh(txq->qdisc);
2138 #ifdef CONFIG_NET_CLS_ACT
2139 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2142 rc = __dev_xmit_skb(skb, q, dev, txq);
2146 /* The device has no queue. Common case for software devices:
2147 loopback, all the sorts of tunnels...
2149 Really, it is unlikely that netif_tx_lock protection is necessary
2150 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2152 However, it is possible, that they rely on protection
2155 Check this and shot the lock. It is not prone from deadlocks.
2156 Either shot noqueue qdisc, it is even simpler 8)
2158 if (dev->flags & IFF_UP) {
2159 int cpu = smp_processor_id(); /* ok because BHs are off */
2161 if (txq->xmit_lock_owner != cpu) {
2163 HARD_TX_LOCK(dev, txq, cpu);
2165 if (!netif_tx_queue_stopped(txq)) {
2166 rc = dev_hard_start_xmit(skb, dev, txq);
2167 if (dev_xmit_complete(rc)) {
2168 HARD_TX_UNLOCK(dev, txq);
2172 HARD_TX_UNLOCK(dev, txq);
2173 if (net_ratelimit())
2174 printk(KERN_CRIT "Virtual device %s asks to "
2175 "queue packet!\n", dev->name);
2177 /* Recursion is detected! It is possible,
2179 if (net_ratelimit())
2180 printk(KERN_CRIT "Dead loop on virtual device "
2181 "%s, fix it urgently!\n", dev->name);
2186 rcu_read_unlock_bh();
2192 rcu_read_unlock_bh();
2195 EXPORT_SYMBOL(dev_queue_xmit);
2198 /*=======================================================================
2200 =======================================================================*/
2202 int netdev_max_backlog __read_mostly = 1000;
2203 int netdev_budget __read_mostly = 300;
2204 int weight_p __read_mostly = 64; /* old backlog weight */
2206 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
2210 /* One global table that all flow-based protocols share. */
2211 struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
2212 EXPORT_SYMBOL(rps_sock_flow_table);
2215 * get_rps_cpu is called from netif_receive_skb and returns the target
2216 * CPU from the RPS map of the receiving queue for a given skb.
2217 * rcu_read_lock must be held on entry.
2219 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2220 struct rps_dev_flow **rflowp)
2222 struct ipv6hdr *ip6;
2224 struct netdev_rx_queue *rxqueue;
2225 struct rps_map *map;
2226 struct rps_dev_flow_table *flow_table;
2227 struct rps_sock_flow_table *sock_flow_table;
2231 u32 addr1, addr2, ports, ihl;
2233 if (skb_rx_queue_recorded(skb)) {
2234 u16 index = skb_get_rx_queue(skb);
2235 if (unlikely(index >= dev->num_rx_queues)) {
2236 if (net_ratelimit()) {
2237 pr_warning("%s received packet on queue "
2238 "%u, but number of RX queues is %u\n",
2239 dev->name, index, dev->num_rx_queues);
2243 rxqueue = dev->_rx + index;
2247 if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
2251 goto got_hash; /* Skip hash computation on packet header */
2253 switch (skb->protocol) {
2254 case __constant_htons(ETH_P_IP):
2255 if (!pskb_may_pull(skb, sizeof(*ip)))
2258 ip = (struct iphdr *) skb->data;
2259 ip_proto = ip->protocol;
2260 addr1 = (__force u32) ip->saddr;
2261 addr2 = (__force u32) ip->daddr;
2264 case __constant_htons(ETH_P_IPV6):
2265 if (!pskb_may_pull(skb, sizeof(*ip6)))
2268 ip6 = (struct ipv6hdr *) skb->data;
2269 ip_proto = ip6->nexthdr;
2270 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2271 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2285 case IPPROTO_UDPLITE:
2286 if (pskb_may_pull(skb, (ihl * 4) + 4)) {
2287 __be16 *hports = (__be16 *) (skb->data + (ihl * 4));
2290 sport = (__force u16) hports[0];
2291 dport = (__force u16) hports[1];
2294 ports = (sport << 16) + dport;
2302 /* get a consistent hash (same value on both flow directions) */
2305 skb->rxhash = jhash_3words(addr1, addr2, ports, hashrnd);
2310 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2311 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2312 if (flow_table && sock_flow_table) {
2314 struct rps_dev_flow *rflow;
2316 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2319 next_cpu = sock_flow_table->ents[skb->rxhash &
2320 sock_flow_table->mask];
2323 * If the desired CPU (where last recvmsg was done) is
2324 * different from current CPU (one in the rx-queue flow
2325 * table entry), switch if one of the following holds:
2326 * - Current CPU is unset (equal to RPS_NO_CPU).
2327 * - Current CPU is offline.
2328 * - The current CPU's queue tail has advanced beyond the
2329 * last packet that was enqueued using this table entry.
2330 * This guarantees that all previous packets for the flow
2331 * have been dequeued, thus preserving in order delivery.
2333 if (unlikely(tcpu != next_cpu) &&
2334 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2335 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2336 rflow->last_qtail)) >= 0)) {
2337 tcpu = rflow->cpu = next_cpu;
2338 if (tcpu != RPS_NO_CPU)
2339 rflow->last_qtail = per_cpu(softnet_data,
2340 tcpu).input_queue_head;
2342 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2349 map = rcu_dereference(rxqueue->rps_map);
2351 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2353 if (cpu_online(tcpu)) {
2363 /* Called from hardirq (IPI) context */
2364 static void rps_trigger_softirq(void *data)
2366 struct softnet_data *sd = data;
2368 __napi_schedule(&sd->backlog);
2369 __get_cpu_var(netdev_rx_stat).received_rps++;
2372 #endif /* CONFIG_RPS */
2375 * Check if this softnet_data structure is another cpu one
2376 * If yes, queue it to our IPI list and return 1
2379 static int rps_ipi_queued(struct softnet_data *sd)
2382 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2385 sd->rps_ipi_next = mysd->rps_ipi_list;
2386 mysd->rps_ipi_list = sd;
2388 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2391 #endif /* CONFIG_RPS */
2396 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2397 * queue (may be a remote CPU queue).
2399 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2400 unsigned int *qtail)
2402 struct softnet_data *sd;
2403 unsigned long flags;
2405 sd = &per_cpu(softnet_data, cpu);
2407 local_irq_save(flags);
2408 __get_cpu_var(netdev_rx_stat).total++;
2411 if (sd->input_pkt_queue.qlen <= netdev_max_backlog) {
2412 if (sd->input_pkt_queue.qlen) {
2414 __skb_queue_tail(&sd->input_pkt_queue, skb);
2416 *qtail = sd->input_queue_head + sd->input_pkt_queue.qlen;
2419 local_irq_restore(flags);
2420 return NET_RX_SUCCESS;
2423 /* Schedule NAPI for backlog device */
2424 if (napi_schedule_prep(&sd->backlog)) {
2425 if (!rps_ipi_queued(sd))
2426 __napi_schedule(&sd->backlog);
2433 __get_cpu_var(netdev_rx_stat).dropped++;
2434 local_irq_restore(flags);
2441 * netif_rx - post buffer to the network code
2442 * @skb: buffer to post
2444 * This function receives a packet from a device driver and queues it for
2445 * the upper (protocol) levels to process. It always succeeds. The buffer
2446 * may be dropped during processing for congestion control or by the
2450 * NET_RX_SUCCESS (no congestion)
2451 * NET_RX_DROP (packet was dropped)
2455 int netif_rx(struct sk_buff *skb)
2459 /* if netpoll wants it, pretend we never saw it */
2460 if (netpoll_rx(skb))
2463 if (!skb->tstamp.tv64)
2468 struct rps_dev_flow voidflow, *rflow = &voidflow;
2473 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2475 cpu = smp_processor_id();
2477 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2484 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2490 EXPORT_SYMBOL(netif_rx);
2492 int netif_rx_ni(struct sk_buff *skb)
2497 err = netif_rx(skb);
2498 if (local_softirq_pending())
2504 EXPORT_SYMBOL(netif_rx_ni);
2506 static void net_tx_action(struct softirq_action *h)
2508 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2510 if (sd->completion_queue) {
2511 struct sk_buff *clist;
2513 local_irq_disable();
2514 clist = sd->completion_queue;
2515 sd->completion_queue = NULL;
2519 struct sk_buff *skb = clist;
2520 clist = clist->next;
2522 WARN_ON(atomic_read(&skb->users));
2527 if (sd->output_queue) {
2530 local_irq_disable();
2531 head = sd->output_queue;
2532 sd->output_queue = NULL;
2536 struct Qdisc *q = head;
2537 spinlock_t *root_lock;
2539 head = head->next_sched;
2541 root_lock = qdisc_lock(q);
2542 if (spin_trylock(root_lock)) {
2543 smp_mb__before_clear_bit();
2544 clear_bit(__QDISC_STATE_SCHED,
2547 spin_unlock(root_lock);
2549 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2551 __netif_reschedule(q);
2553 smp_mb__before_clear_bit();
2554 clear_bit(__QDISC_STATE_SCHED,
2562 static inline int deliver_skb(struct sk_buff *skb,
2563 struct packet_type *pt_prev,
2564 struct net_device *orig_dev)
2566 atomic_inc(&skb->users);
2567 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2570 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2572 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
2573 /* This hook is defined here for ATM LANE */
2574 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2575 unsigned char *addr) __read_mostly;
2576 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2580 * If bridge module is loaded call bridging hook.
2581 * returns NULL if packet was consumed.
2583 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2584 struct sk_buff *skb) __read_mostly;
2585 EXPORT_SYMBOL_GPL(br_handle_frame_hook);
2587 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2588 struct packet_type **pt_prev, int *ret,
2589 struct net_device *orig_dev)
2591 struct net_bridge_port *port;
2593 if (skb->pkt_type == PACKET_LOOPBACK ||
2594 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2598 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2602 return br_handle_frame_hook(port, skb);
2605 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2608 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2609 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2610 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2612 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2613 struct packet_type **pt_prev,
2615 struct net_device *orig_dev)
2617 if (skb->dev->macvlan_port == NULL)
2621 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2624 return macvlan_handle_frame_hook(skb);
2627 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2630 #ifdef CONFIG_NET_CLS_ACT
2631 /* TODO: Maybe we should just force sch_ingress to be compiled in
2632 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2633 * a compare and 2 stores extra right now if we dont have it on
2634 * but have CONFIG_NET_CLS_ACT
2635 * NOTE: This doesnt stop any functionality; if you dont have
2636 * the ingress scheduler, you just cant add policies on ingress.
2639 static int ing_filter(struct sk_buff *skb)
2641 struct net_device *dev = skb->dev;
2642 u32 ttl = G_TC_RTTL(skb->tc_verd);
2643 struct netdev_queue *rxq;
2644 int result = TC_ACT_OK;
2647 if (MAX_RED_LOOP < ttl++) {
2649 "Redir loop detected Dropping packet (%d->%d)\n",
2650 skb->skb_iif, dev->ifindex);
2654 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2655 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2657 rxq = &dev->rx_queue;
2660 if (q != &noop_qdisc) {
2661 spin_lock(qdisc_lock(q));
2662 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2663 result = qdisc_enqueue_root(skb, q);
2664 spin_unlock(qdisc_lock(q));
2670 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2671 struct packet_type **pt_prev,
2672 int *ret, struct net_device *orig_dev)
2674 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2678 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2681 /* Huh? Why does turning on AF_PACKET affect this? */
2682 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2685 switch (ing_filter(skb)) {
2699 * netif_nit_deliver - deliver received packets to network taps
2702 * This function is used to deliver incoming packets to network
2703 * taps. It should be used when the normal netif_receive_skb path
2704 * is bypassed, for example because of VLAN acceleration.
2706 void netif_nit_deliver(struct sk_buff *skb)
2708 struct packet_type *ptype;
2710 if (list_empty(&ptype_all))
2713 skb_reset_network_header(skb);
2714 skb_reset_transport_header(skb);
2715 skb->mac_len = skb->network_header - skb->mac_header;
2718 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2719 if (!ptype->dev || ptype->dev == skb->dev)
2720 deliver_skb(skb, ptype, skb->dev);
2725 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2726 struct net_device *master)
2728 if (skb->pkt_type == PACKET_HOST) {
2729 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2731 memcpy(dest, master->dev_addr, ETH_ALEN);
2735 /* On bonding slaves other than the currently active slave, suppress
2736 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2737 * ARP on active-backup slaves with arp_validate enabled.
2739 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2741 struct net_device *dev = skb->dev;
2743 if (master->priv_flags & IFF_MASTER_ARPMON)
2744 dev->last_rx = jiffies;
2746 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
2747 /* Do address unmangle. The local destination address
2748 * will be always the one master has. Provides the right
2749 * functionality in a bridge.
2751 skb_bond_set_mac_by_master(skb, master);
2754 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2755 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2756 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2759 if (master->priv_flags & IFF_MASTER_ALB) {
2760 if (skb->pkt_type != PACKET_BROADCAST &&
2761 skb->pkt_type != PACKET_MULTICAST)
2764 if (master->priv_flags & IFF_MASTER_8023AD &&
2765 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2772 EXPORT_SYMBOL(__skb_bond_should_drop);
2774 static int __netif_receive_skb(struct sk_buff *skb)
2776 struct packet_type *ptype, *pt_prev;
2777 struct net_device *orig_dev;
2778 struct net_device *master;
2779 struct net_device *null_or_orig;
2780 struct net_device *null_or_bond;
2781 int ret = NET_RX_DROP;
2784 if (!skb->tstamp.tv64)
2787 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2788 return NET_RX_SUCCESS;
2790 /* if we've gotten here through NAPI, check netpoll */
2791 if (netpoll_receive_skb(skb))
2795 skb->skb_iif = skb->dev->ifindex;
2797 null_or_orig = NULL;
2798 orig_dev = skb->dev;
2799 master = ACCESS_ONCE(orig_dev->master);
2801 if (skb_bond_should_drop(skb, master))
2802 null_or_orig = orig_dev; /* deliver only exact match */
2807 __get_cpu_var(netdev_rx_stat).total++;
2809 skb_reset_network_header(skb);
2810 skb_reset_transport_header(skb);
2811 skb->mac_len = skb->network_header - skb->mac_header;
2817 #ifdef CONFIG_NET_CLS_ACT
2818 if (skb->tc_verd & TC_NCLS) {
2819 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2824 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2825 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2826 ptype->dev == orig_dev) {
2828 ret = deliver_skb(skb, pt_prev, orig_dev);
2833 #ifdef CONFIG_NET_CLS_ACT
2834 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2840 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2843 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2848 * Make sure frames received on VLAN interfaces stacked on
2849 * bonding interfaces still make their way to any base bonding
2850 * device that may have registered for a specific ptype. The
2851 * handler may have to adjust skb->dev and orig_dev.
2853 null_or_bond = NULL;
2854 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2855 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2856 null_or_bond = vlan_dev_real_dev(skb->dev);
2859 type = skb->protocol;
2860 list_for_each_entry_rcu(ptype,
2861 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2862 if (ptype->type == type && (ptype->dev == null_or_orig ||
2863 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2864 ptype->dev == null_or_bond)) {
2866 ret = deliver_skb(skb, pt_prev, orig_dev);
2872 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2875 /* Jamal, now you will not able to escape explaining
2876 * me how you were going to use this. :-)
2887 * netif_receive_skb - process receive buffer from network
2888 * @skb: buffer to process
2890 * netif_receive_skb() is the main receive data processing function.
2891 * It always succeeds. The buffer may be dropped during processing
2892 * for congestion control or by the protocol layers.
2894 * This function may only be called from softirq context and interrupts
2895 * should be enabled.
2897 * Return values (usually ignored):
2898 * NET_RX_SUCCESS: no congestion
2899 * NET_RX_DROP: packet was dropped
2901 int netif_receive_skb(struct sk_buff *skb)
2904 struct rps_dev_flow voidflow, *rflow = &voidflow;
2909 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2912 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2916 ret = __netif_receive_skb(skb);
2921 return __netif_receive_skb(skb);
2924 EXPORT_SYMBOL(netif_receive_skb);
2926 /* Network device is going away, flush any packets still pending
2927 * Called with irqs disabled.
2929 static void flush_backlog(void *arg)
2931 struct net_device *dev = arg;
2932 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2933 struct sk_buff *skb, *tmp;
2936 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp)
2937 if (skb->dev == dev) {
2938 __skb_unlink(skb, &sd->input_pkt_queue);
2940 input_queue_head_incr(sd);
2945 static int napi_gro_complete(struct sk_buff *skb)
2947 struct packet_type *ptype;
2948 __be16 type = skb->protocol;
2949 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2952 if (NAPI_GRO_CB(skb)->count == 1) {
2953 skb_shinfo(skb)->gso_size = 0;
2958 list_for_each_entry_rcu(ptype, head, list) {
2959 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2962 err = ptype->gro_complete(skb);
2968 WARN_ON(&ptype->list == head);
2970 return NET_RX_SUCCESS;
2974 return netif_receive_skb(skb);
2977 static void napi_gro_flush(struct napi_struct *napi)
2979 struct sk_buff *skb, *next;
2981 for (skb = napi->gro_list; skb; skb = next) {
2984 napi_gro_complete(skb);
2987 napi->gro_count = 0;
2988 napi->gro_list = NULL;
2991 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2993 struct sk_buff **pp = NULL;
2994 struct packet_type *ptype;
2995 __be16 type = skb->protocol;
2996 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2999 enum gro_result ret;
3001 if (!(skb->dev->features & NETIF_F_GRO))
3004 if (skb_is_gso(skb) || skb_has_frags(skb))
3008 list_for_each_entry_rcu(ptype, head, list) {
3009 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3012 skb_set_network_header(skb, skb_gro_offset(skb));
3013 mac_len = skb->network_header - skb->mac_header;
3014 skb->mac_len = mac_len;
3015 NAPI_GRO_CB(skb)->same_flow = 0;
3016 NAPI_GRO_CB(skb)->flush = 0;
3017 NAPI_GRO_CB(skb)->free = 0;
3019 pp = ptype->gro_receive(&napi->gro_list, skb);
3024 if (&ptype->list == head)
3027 same_flow = NAPI_GRO_CB(skb)->same_flow;
3028 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3031 struct sk_buff *nskb = *pp;
3035 napi_gro_complete(nskb);
3042 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3046 NAPI_GRO_CB(skb)->count = 1;
3047 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3048 skb->next = napi->gro_list;
3049 napi->gro_list = skb;
3053 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3054 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3056 BUG_ON(skb->end - skb->tail < grow);
3058 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3061 skb->data_len -= grow;
3063 skb_shinfo(skb)->frags[0].page_offset += grow;
3064 skb_shinfo(skb)->frags[0].size -= grow;
3066 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3067 put_page(skb_shinfo(skb)->frags[0].page);
3068 memmove(skb_shinfo(skb)->frags,
3069 skb_shinfo(skb)->frags + 1,
3070 --skb_shinfo(skb)->nr_frags);
3081 EXPORT_SYMBOL(dev_gro_receive);
3084 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3088 if (netpoll_rx_on(skb))
3091 for (p = napi->gro_list; p; p = p->next) {
3092 NAPI_GRO_CB(p)->same_flow =
3093 (p->dev == skb->dev) &&
3094 !compare_ether_header(skb_mac_header(p),
3095 skb_gro_mac_header(skb));
3096 NAPI_GRO_CB(p)->flush = 0;
3099 return dev_gro_receive(napi, skb);
3102 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3106 if (netif_receive_skb(skb))
3111 case GRO_MERGED_FREE:
3122 EXPORT_SYMBOL(napi_skb_finish);
3124 void skb_gro_reset_offset(struct sk_buff *skb)
3126 NAPI_GRO_CB(skb)->data_offset = 0;
3127 NAPI_GRO_CB(skb)->frag0 = NULL;
3128 NAPI_GRO_CB(skb)->frag0_len = 0;
3130 if (skb->mac_header == skb->tail &&
3131 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3132 NAPI_GRO_CB(skb)->frag0 =
3133 page_address(skb_shinfo(skb)->frags[0].page) +
3134 skb_shinfo(skb)->frags[0].page_offset;
3135 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3138 EXPORT_SYMBOL(skb_gro_reset_offset);
3140 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3142 skb_gro_reset_offset(skb);
3144 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3146 EXPORT_SYMBOL(napi_gro_receive);
3148 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3150 __skb_pull(skb, skb_headlen(skb));
3151 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3155 EXPORT_SYMBOL(napi_reuse_skb);
3157 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3159 struct sk_buff *skb = napi->skb;
3162 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3168 EXPORT_SYMBOL(napi_get_frags);
3170 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3176 skb->protocol = eth_type_trans(skb, skb->dev);
3178 if (ret == GRO_HELD)
3179 skb_gro_pull(skb, -ETH_HLEN);
3180 else if (netif_receive_skb(skb))
3185 case GRO_MERGED_FREE:
3186 napi_reuse_skb(napi, skb);
3195 EXPORT_SYMBOL(napi_frags_finish);
3197 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3199 struct sk_buff *skb = napi->skb;
3206 skb_reset_mac_header(skb);
3207 skb_gro_reset_offset(skb);
3209 off = skb_gro_offset(skb);
3210 hlen = off + sizeof(*eth);
3211 eth = skb_gro_header_fast(skb, off);
3212 if (skb_gro_header_hard(skb, hlen)) {
3213 eth = skb_gro_header_slow(skb, hlen, off);
3214 if (unlikely(!eth)) {
3215 napi_reuse_skb(napi, skb);
3221 skb_gro_pull(skb, sizeof(*eth));
3224 * This works because the only protocols we care about don't require
3225 * special handling. We'll fix it up properly at the end.
3227 skb->protocol = eth->h_proto;
3232 EXPORT_SYMBOL(napi_frags_skb);
3234 gro_result_t napi_gro_frags(struct napi_struct *napi)
3236 struct sk_buff *skb = napi_frags_skb(napi);
3241 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3243 EXPORT_SYMBOL(napi_gro_frags);
3246 * net_rps_action sends any pending IPI's for rps.
3247 * Note: called with local irq disabled, but exits with local irq enabled.
3249 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3252 struct softnet_data *remsd = sd->rps_ipi_list;
3255 sd->rps_ipi_list = NULL;
3259 /* Send pending IPI's to kick RPS processing on remote cpus. */
3261 struct softnet_data *next = remsd->rps_ipi_next;
3263 if (cpu_online(remsd->cpu))
3264 __smp_call_function_single(remsd->cpu,
3273 static int process_backlog(struct napi_struct *napi, int quota)
3276 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3279 /* Check if we have pending ipi, its better to send them now,
3280 * not waiting net_rx_action() end.
3282 if (sd->rps_ipi_list) {
3283 local_irq_disable();
3284 net_rps_action_and_irq_enable(sd);
3287 napi->weight = weight_p;
3289 struct sk_buff *skb;
3291 local_irq_disable();
3293 skb = __skb_dequeue(&sd->input_pkt_queue);
3295 __napi_complete(napi);
3300 input_queue_head_incr(sd);
3304 __netif_receive_skb(skb);
3305 } while (++work < quota);
3311 * __napi_schedule - schedule for receive
3312 * @n: entry to schedule
3314 * The entry's receive function will be scheduled to run
3316 void __napi_schedule(struct napi_struct *n)
3318 unsigned long flags;
3320 local_irq_save(flags);
3321 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
3322 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3323 local_irq_restore(flags);
3325 EXPORT_SYMBOL(__napi_schedule);
3327 void __napi_complete(struct napi_struct *n)
3329 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3330 BUG_ON(n->gro_list);
3332 list_del(&n->poll_list);
3333 smp_mb__before_clear_bit();
3334 clear_bit(NAPI_STATE_SCHED, &n->state);
3336 EXPORT_SYMBOL(__napi_complete);
3338 void napi_complete(struct napi_struct *n)
3340 unsigned long flags;
3343 * don't let napi dequeue from the cpu poll list
3344 * just in case its running on a different cpu
3346 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3350 local_irq_save(flags);
3352 local_irq_restore(flags);
3354 EXPORT_SYMBOL(napi_complete);
3356 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3357 int (*poll)(struct napi_struct *, int), int weight)
3359 INIT_LIST_HEAD(&napi->poll_list);
3360 napi->gro_count = 0;
3361 napi->gro_list = NULL;
3364 napi->weight = weight;
3365 list_add(&napi->dev_list, &dev->napi_list);
3367 #ifdef CONFIG_NETPOLL
3368 spin_lock_init(&napi->poll_lock);
3369 napi->poll_owner = -1;
3371 set_bit(NAPI_STATE_SCHED, &napi->state);
3373 EXPORT_SYMBOL(netif_napi_add);
3375 void netif_napi_del(struct napi_struct *napi)
3377 struct sk_buff *skb, *next;
3379 list_del_init(&napi->dev_list);
3380 napi_free_frags(napi);
3382 for (skb = napi->gro_list; skb; skb = next) {
3388 napi->gro_list = NULL;
3389 napi->gro_count = 0;
3391 EXPORT_SYMBOL(netif_napi_del);
3393 static void net_rx_action(struct softirq_action *h)
3395 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3396 unsigned long time_limit = jiffies + 2;
3397 int budget = netdev_budget;
3400 local_irq_disable();
3402 while (!list_empty(&sd->poll_list)) {
3403 struct napi_struct *n;
3406 /* If softirq window is exhuasted then punt.
3407 * Allow this to run for 2 jiffies since which will allow
3408 * an average latency of 1.5/HZ.
3410 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3415 /* Even though interrupts have been re-enabled, this
3416 * access is safe because interrupts can only add new
3417 * entries to the tail of this list, and only ->poll()
3418 * calls can remove this head entry from the list.
3420 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3422 have = netpoll_poll_lock(n);
3426 /* This NAPI_STATE_SCHED test is for avoiding a race
3427 * with netpoll's poll_napi(). Only the entity which
3428 * obtains the lock and sees NAPI_STATE_SCHED set will
3429 * actually make the ->poll() call. Therefore we avoid
3430 * accidently calling ->poll() when NAPI is not scheduled.
3433 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3434 work = n->poll(n, weight);
3438 WARN_ON_ONCE(work > weight);
3442 local_irq_disable();
3444 /* Drivers must not modify the NAPI state if they
3445 * consume the entire weight. In such cases this code
3446 * still "owns" the NAPI instance and therefore can
3447 * move the instance around on the list at-will.
3449 if (unlikely(work == weight)) {
3450 if (unlikely(napi_disable_pending(n))) {
3453 local_irq_disable();
3455 list_move_tail(&n->poll_list, &sd->poll_list);
3458 netpoll_poll_unlock(have);
3461 net_rps_action_and_irq_enable(sd);
3463 #ifdef CONFIG_NET_DMA
3465 * There may not be any more sk_buffs coming right now, so push
3466 * any pending DMA copies to hardware
3468 dma_issue_pending_all();
3474 __get_cpu_var(netdev_rx_stat).time_squeeze++;
3475 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3479 static gifconf_func_t *gifconf_list[NPROTO];
3482 * register_gifconf - register a SIOCGIF handler
3483 * @family: Address family
3484 * @gifconf: Function handler
3486 * Register protocol dependent address dumping routines. The handler
3487 * that is passed must not be freed or reused until it has been replaced
3488 * by another handler.
3490 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3492 if (family >= NPROTO)
3494 gifconf_list[family] = gifconf;
3497 EXPORT_SYMBOL(register_gifconf);
3501 * Map an interface index to its name (SIOCGIFNAME)
3505 * We need this ioctl for efficient implementation of the
3506 * if_indextoname() function required by the IPv6 API. Without
3507 * it, we would have to search all the interfaces to find a
3511 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3513 struct net_device *dev;
3517 * Fetch the caller's info block.
3520 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3524 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3530 strcpy(ifr.ifr_name, dev->name);
3533 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3539 * Perform a SIOCGIFCONF call. This structure will change
3540 * size eventually, and there is nothing I can do about it.
3541 * Thus we will need a 'compatibility mode'.
3544 static int dev_ifconf(struct net *net, char __user *arg)
3547 struct net_device *dev;
3554 * Fetch the caller's info block.
3557 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3564 * Loop over the interfaces, and write an info block for each.
3568 for_each_netdev(net, dev) {
3569 for (i = 0; i < NPROTO; i++) {
3570 if (gifconf_list[i]) {
3573 done = gifconf_list[i](dev, NULL, 0);
3575 done = gifconf_list[i](dev, pos + total,
3585 * All done. Write the updated control block back to the caller.
3587 ifc.ifc_len = total;
3590 * Both BSD and Solaris return 0 here, so we do too.
3592 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3595 #ifdef CONFIG_PROC_FS
3597 * This is invoked by the /proc filesystem handler to display a device
3600 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3603 struct net *net = seq_file_net(seq);
3605 struct net_device *dev;
3609 return SEQ_START_TOKEN;
3612 for_each_netdev_rcu(net, dev)
3619 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3621 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3622 first_net_device(seq_file_net(seq)) :
3623 next_net_device((struct net_device *)v);
3626 return rcu_dereference(dev);
3629 void dev_seq_stop(struct seq_file *seq, void *v)
3635 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3637 const struct net_device_stats *stats = dev_get_stats(dev);
3639 seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3640 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3641 dev->name, stats->rx_bytes, stats->rx_packets,
3643 stats->rx_dropped + stats->rx_missed_errors,
3644 stats->rx_fifo_errors,
3645 stats->rx_length_errors + stats->rx_over_errors +
3646 stats->rx_crc_errors + stats->rx_frame_errors,
3647 stats->rx_compressed, stats->multicast,
3648 stats->tx_bytes, stats->tx_packets,
3649 stats->tx_errors, stats->tx_dropped,
3650 stats->tx_fifo_errors, stats->collisions,
3651 stats->tx_carrier_errors +
3652 stats->tx_aborted_errors +
3653 stats->tx_window_errors +
3654 stats->tx_heartbeat_errors,
3655 stats->tx_compressed);
3659 * Called from the PROCfs module. This now uses the new arbitrary sized
3660 * /proc/net interface to create /proc/net/dev
3662 static int dev_seq_show(struct seq_file *seq, void *v)
3664 if (v == SEQ_START_TOKEN)
3665 seq_puts(seq, "Inter-| Receive "
3667 " face |bytes packets errs drop fifo frame "
3668 "compressed multicast|bytes packets errs "
3669 "drop fifo colls carrier compressed\n");
3671 dev_seq_printf_stats(seq, v);
3675 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
3677 struct netif_rx_stats *rc = NULL;
3679 while (*pos < nr_cpu_ids)
3680 if (cpu_online(*pos)) {
3681 rc = &per_cpu(netdev_rx_stat, *pos);
3688 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3690 return softnet_get_online(pos);
3693 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3696 return softnet_get_online(pos);
3699 static void softnet_seq_stop(struct seq_file *seq, void *v)
3703 static int softnet_seq_show(struct seq_file *seq, void *v)
3705 struct netif_rx_stats *s = v;
3707 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3708 s->total, s->dropped, s->time_squeeze, 0,
3709 0, 0, 0, 0, /* was fastroute */
3710 s->cpu_collision, s->received_rps);
3714 static const struct seq_operations dev_seq_ops = {
3715 .start = dev_seq_start,
3716 .next = dev_seq_next,
3717 .stop = dev_seq_stop,
3718 .show = dev_seq_show,
3721 static int dev_seq_open(struct inode *inode, struct file *file)
3723 return seq_open_net(inode, file, &dev_seq_ops,
3724 sizeof(struct seq_net_private));
3727 static const struct file_operations dev_seq_fops = {
3728 .owner = THIS_MODULE,
3729 .open = dev_seq_open,
3731 .llseek = seq_lseek,
3732 .release = seq_release_net,
3735 static const struct seq_operations softnet_seq_ops = {
3736 .start = softnet_seq_start,
3737 .next = softnet_seq_next,
3738 .stop = softnet_seq_stop,
3739 .show = softnet_seq_show,
3742 static int softnet_seq_open(struct inode *inode, struct file *file)
3744 return seq_open(file, &softnet_seq_ops);
3747 static const struct file_operations softnet_seq_fops = {
3748 .owner = THIS_MODULE,
3749 .open = softnet_seq_open,
3751 .llseek = seq_lseek,
3752 .release = seq_release,
3755 static void *ptype_get_idx(loff_t pos)
3757 struct packet_type *pt = NULL;
3761 list_for_each_entry_rcu(pt, &ptype_all, list) {
3767 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3768 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3777 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3781 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3784 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3786 struct packet_type *pt;
3787 struct list_head *nxt;
3791 if (v == SEQ_START_TOKEN)
3792 return ptype_get_idx(0);
3795 nxt = pt->list.next;
3796 if (pt->type == htons(ETH_P_ALL)) {
3797 if (nxt != &ptype_all)
3800 nxt = ptype_base[0].next;
3802 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3804 while (nxt == &ptype_base[hash]) {
3805 if (++hash >= PTYPE_HASH_SIZE)
3807 nxt = ptype_base[hash].next;
3810 return list_entry(nxt, struct packet_type, list);
3813 static void ptype_seq_stop(struct seq_file *seq, void *v)
3819 static int ptype_seq_show(struct seq_file *seq, void *v)
3821 struct packet_type *pt = v;
3823 if (v == SEQ_START_TOKEN)
3824 seq_puts(seq, "Type Device Function\n");
3825 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3826 if (pt->type == htons(ETH_P_ALL))
3827 seq_puts(seq, "ALL ");
3829 seq_printf(seq, "%04x", ntohs(pt->type));
3831 seq_printf(seq, " %-8s %pF\n",
3832 pt->dev ? pt->dev->name : "", pt->func);
3838 static const struct seq_operations ptype_seq_ops = {
3839 .start = ptype_seq_start,
3840 .next = ptype_seq_next,
3841 .stop = ptype_seq_stop,
3842 .show = ptype_seq_show,
3845 static int ptype_seq_open(struct inode *inode, struct file *file)
3847 return seq_open_net(inode, file, &ptype_seq_ops,
3848 sizeof(struct seq_net_private));
3851 static const struct file_operations ptype_seq_fops = {
3852 .owner = THIS_MODULE,
3853 .open = ptype_seq_open,
3855 .llseek = seq_lseek,
3856 .release = seq_release_net,
3860 static int __net_init dev_proc_net_init(struct net *net)
3864 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3866 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3868 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3871 if (wext_proc_init(net))
3877 proc_net_remove(net, "ptype");
3879 proc_net_remove(net, "softnet_stat");
3881 proc_net_remove(net, "dev");
3885 static void __net_exit dev_proc_net_exit(struct net *net)
3887 wext_proc_exit(net);
3889 proc_net_remove(net, "ptype");
3890 proc_net_remove(net, "softnet_stat");
3891 proc_net_remove(net, "dev");
3894 static struct pernet_operations __net_initdata dev_proc_ops = {
3895 .init = dev_proc_net_init,
3896 .exit = dev_proc_net_exit,
3899 static int __init dev_proc_init(void)
3901 return register_pernet_subsys(&dev_proc_ops);
3904 #define dev_proc_init() 0
3905 #endif /* CONFIG_PROC_FS */
3909 * netdev_set_master - set up master/slave pair
3910 * @slave: slave device
3911 * @master: new master device
3913 * Changes the master device of the slave. Pass %NULL to break the
3914 * bonding. The caller must hold the RTNL semaphore. On a failure
3915 * a negative errno code is returned. On success the reference counts
3916 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3917 * function returns zero.
3919 int netdev_set_master(struct net_device *slave, struct net_device *master)
3921 struct net_device *old = slave->master;
3931 slave->master = master;
3938 slave->flags |= IFF_SLAVE;
3940 slave->flags &= ~IFF_SLAVE;
3942 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3945 EXPORT_SYMBOL(netdev_set_master);
3947 static void dev_change_rx_flags(struct net_device *dev, int flags)
3949 const struct net_device_ops *ops = dev->netdev_ops;
3951 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3952 ops->ndo_change_rx_flags(dev, flags);
3955 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3957 unsigned short old_flags = dev->flags;
3963 dev->flags |= IFF_PROMISC;
3964 dev->promiscuity += inc;
3965 if (dev->promiscuity == 0) {
3968 * If inc causes overflow, untouch promisc and return error.
3971 dev->flags &= ~IFF_PROMISC;
3973 dev->promiscuity -= inc;
3974 printk(KERN_WARNING "%s: promiscuity touches roof, "
3975 "set promiscuity failed, promiscuity feature "
3976 "of device might be broken.\n", dev->name);
3980 if (dev->flags != old_flags) {
3981 printk(KERN_INFO "device %s %s promiscuous mode\n",
3982 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3984 if (audit_enabled) {
3985 current_uid_gid(&uid, &gid);
3986 audit_log(current->audit_context, GFP_ATOMIC,
3987 AUDIT_ANOM_PROMISCUOUS,
3988 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3989 dev->name, (dev->flags & IFF_PROMISC),
3990 (old_flags & IFF_PROMISC),
3991 audit_get_loginuid(current),
3993 audit_get_sessionid(current));
3996 dev_change_rx_flags(dev, IFF_PROMISC);
4002 * dev_set_promiscuity - update promiscuity count on a device
4006 * Add or remove promiscuity from a device. While the count in the device
4007 * remains above zero the interface remains promiscuous. Once it hits zero
4008 * the device reverts back to normal filtering operation. A negative inc
4009 * value is used to drop promiscuity on the device.
4010 * Return 0 if successful or a negative errno code on error.
4012 int dev_set_promiscuity(struct net_device *dev, int inc)
4014 unsigned short old_flags = dev->flags;
4017 err = __dev_set_promiscuity(dev, inc);
4020 if (dev->flags != old_flags)
4021 dev_set_rx_mode(dev);
4024 EXPORT_SYMBOL(dev_set_promiscuity);
4027 * dev_set_allmulti - update allmulti count on a device
4031 * Add or remove reception of all multicast frames to a device. While the
4032 * count in the device remains above zero the interface remains listening
4033 * to all interfaces. Once it hits zero the device reverts back to normal
4034 * filtering operation. A negative @inc value is used to drop the counter
4035 * when releasing a resource needing all multicasts.
4036 * Return 0 if successful or a negative errno code on error.
4039 int dev_set_allmulti(struct net_device *dev, int inc)
4041 unsigned short old_flags = dev->flags;
4045 dev->flags |= IFF_ALLMULTI;
4046 dev->allmulti += inc;
4047 if (dev->allmulti == 0) {
4050 * If inc causes overflow, untouch allmulti and return error.
4053 dev->flags &= ~IFF_ALLMULTI;
4055 dev->allmulti -= inc;
4056 printk(KERN_WARNING "%s: allmulti touches roof, "
4057 "set allmulti failed, allmulti feature of "
4058 "device might be broken.\n", dev->name);
4062 if (dev->flags ^ old_flags) {
4063 dev_change_rx_flags(dev, IFF_ALLMULTI);
4064 dev_set_rx_mode(dev);
4068 EXPORT_SYMBOL(dev_set_allmulti);
4071 * Upload unicast and multicast address lists to device and
4072 * configure RX filtering. When the device doesn't support unicast
4073 * filtering it is put in promiscuous mode while unicast addresses
4076 void __dev_set_rx_mode(struct net_device *dev)
4078 const struct net_device_ops *ops = dev->netdev_ops;
4080 /* dev_open will call this function so the list will stay sane. */
4081 if (!(dev->flags&IFF_UP))
4084 if (!netif_device_present(dev))
4087 if (ops->ndo_set_rx_mode)
4088 ops->ndo_set_rx_mode(dev);
4090 /* Unicast addresses changes may only happen under the rtnl,
4091 * therefore calling __dev_set_promiscuity here is safe.
4093 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4094 __dev_set_promiscuity(dev, 1);
4095 dev->uc_promisc = 1;
4096 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4097 __dev_set_promiscuity(dev, -1);
4098 dev->uc_promisc = 0;
4101 if (ops->ndo_set_multicast_list)
4102 ops->ndo_set_multicast_list(dev);
4106 void dev_set_rx_mode(struct net_device *dev)
4108 netif_addr_lock_bh(dev);
4109 __dev_set_rx_mode(dev);
4110 netif_addr_unlock_bh(dev);
4114 * dev_get_flags - get flags reported to userspace
4117 * Get the combination of flag bits exported through APIs to userspace.
4119 unsigned dev_get_flags(const struct net_device *dev)
4123 flags = (dev->flags & ~(IFF_PROMISC |
4128 (dev->gflags & (IFF_PROMISC |
4131 if (netif_running(dev)) {
4132 if (netif_oper_up(dev))
4133 flags |= IFF_RUNNING;
4134 if (netif_carrier_ok(dev))
4135 flags |= IFF_LOWER_UP;
4136 if (netif_dormant(dev))
4137 flags |= IFF_DORMANT;
4142 EXPORT_SYMBOL(dev_get_flags);
4144 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4146 int old_flags = dev->flags;
4152 * Set the flags on our device.
4155 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4156 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4158 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4162 * Load in the correct multicast list now the flags have changed.
4165 if ((old_flags ^ flags) & IFF_MULTICAST)
4166 dev_change_rx_flags(dev, IFF_MULTICAST);
4168 dev_set_rx_mode(dev);
4171 * Have we downed the interface. We handle IFF_UP ourselves
4172 * according to user attempts to set it, rather than blindly
4177 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4178 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4181 dev_set_rx_mode(dev);
4184 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4185 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4187 dev->gflags ^= IFF_PROMISC;
4188 dev_set_promiscuity(dev, inc);
4191 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4192 is important. Some (broken) drivers set IFF_PROMISC, when
4193 IFF_ALLMULTI is requested not asking us and not reporting.
4195 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4196 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4198 dev->gflags ^= IFF_ALLMULTI;
4199 dev_set_allmulti(dev, inc);
4205 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4207 unsigned int changes = dev->flags ^ old_flags;
4209 if (changes & IFF_UP) {
4210 if (dev->flags & IFF_UP)
4211 call_netdevice_notifiers(NETDEV_UP, dev);
4213 call_netdevice_notifiers(NETDEV_DOWN, dev);
4216 if (dev->flags & IFF_UP &&
4217 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4218 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4222 * dev_change_flags - change device settings
4224 * @flags: device state flags
4226 * Change settings on device based state flags. The flags are
4227 * in the userspace exported format.
4229 int dev_change_flags(struct net_device *dev, unsigned flags)
4232 int old_flags = dev->flags;
4234 ret = __dev_change_flags(dev, flags);
4238 changes = old_flags ^ dev->flags;
4240 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4242 __dev_notify_flags(dev, old_flags);
4245 EXPORT_SYMBOL(dev_change_flags);
4248 * dev_set_mtu - Change maximum transfer unit
4250 * @new_mtu: new transfer unit
4252 * Change the maximum transfer size of the network device.
4254 int dev_set_mtu(struct net_device *dev, int new_mtu)
4256 const struct net_device_ops *ops = dev->netdev_ops;
4259 if (new_mtu == dev->mtu)
4262 /* MTU must be positive. */
4266 if (!netif_device_present(dev))
4270 if (ops->ndo_change_mtu)
4271 err = ops->ndo_change_mtu(dev, new_mtu);
4275 if (!err && dev->flags & IFF_UP)
4276 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4279 EXPORT_SYMBOL(dev_set_mtu);
4282 * dev_set_mac_address - Change Media Access Control Address
4286 * Change the hardware (MAC) address of the device
4288 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4290 const struct net_device_ops *ops = dev->netdev_ops;
4293 if (!ops->ndo_set_mac_address)
4295 if (sa->sa_family != dev->type)
4297 if (!netif_device_present(dev))
4299 err = ops->ndo_set_mac_address(dev, sa);
4301 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4304 EXPORT_SYMBOL(dev_set_mac_address);
4307 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4309 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4312 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4318 case SIOCGIFFLAGS: /* Get interface flags */
4319 ifr->ifr_flags = (short) dev_get_flags(dev);
4322 case SIOCGIFMETRIC: /* Get the metric on the interface
4323 (currently unused) */
4324 ifr->ifr_metric = 0;
4327 case SIOCGIFMTU: /* Get the MTU of a device */
4328 ifr->ifr_mtu = dev->mtu;
4333 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4335 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4336 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4337 ifr->ifr_hwaddr.sa_family = dev->type;
4345 ifr->ifr_map.mem_start = dev->mem_start;
4346 ifr->ifr_map.mem_end = dev->mem_end;
4347 ifr->ifr_map.base_addr = dev->base_addr;
4348 ifr->ifr_map.irq = dev->irq;
4349 ifr->ifr_map.dma = dev->dma;
4350 ifr->ifr_map.port = dev->if_port;
4354 ifr->ifr_ifindex = dev->ifindex;
4358 ifr->ifr_qlen = dev->tx_queue_len;
4362 /* dev_ioctl() should ensure this case
4374 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4376 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4379 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4380 const struct net_device_ops *ops;
4385 ops = dev->netdev_ops;
4388 case SIOCSIFFLAGS: /* Set interface flags */
4389 return dev_change_flags(dev, ifr->ifr_flags);
4391 case SIOCSIFMETRIC: /* Set the metric on the interface
4392 (currently unused) */
4395 case SIOCSIFMTU: /* Set the MTU of a device */
4396 return dev_set_mtu(dev, ifr->ifr_mtu);
4399 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4401 case SIOCSIFHWBROADCAST:
4402 if (ifr->ifr_hwaddr.sa_family != dev->type)
4404 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4405 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4406 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4410 if (ops->ndo_set_config) {
4411 if (!netif_device_present(dev))
4413 return ops->ndo_set_config(dev, &ifr->ifr_map);
4418 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4419 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4421 if (!netif_device_present(dev))
4423 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4426 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4427 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4429 if (!netif_device_present(dev))
4431 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4434 if (ifr->ifr_qlen < 0)
4436 dev->tx_queue_len = ifr->ifr_qlen;
4440 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4441 return dev_change_name(dev, ifr->ifr_newname);
4444 * Unknown or private ioctl
4447 if ((cmd >= SIOCDEVPRIVATE &&
4448 cmd <= SIOCDEVPRIVATE + 15) ||
4449 cmd == SIOCBONDENSLAVE ||
4450 cmd == SIOCBONDRELEASE ||
4451 cmd == SIOCBONDSETHWADDR ||
4452 cmd == SIOCBONDSLAVEINFOQUERY ||
4453 cmd == SIOCBONDINFOQUERY ||
4454 cmd == SIOCBONDCHANGEACTIVE ||
4455 cmd == SIOCGMIIPHY ||
4456 cmd == SIOCGMIIREG ||
4457 cmd == SIOCSMIIREG ||
4458 cmd == SIOCBRADDIF ||
4459 cmd == SIOCBRDELIF ||
4460 cmd == SIOCSHWTSTAMP ||
4461 cmd == SIOCWANDEV) {
4463 if (ops->ndo_do_ioctl) {
4464 if (netif_device_present(dev))
4465 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4477 * This function handles all "interface"-type I/O control requests. The actual
4478 * 'doing' part of this is dev_ifsioc above.
4482 * dev_ioctl - network device ioctl
4483 * @net: the applicable net namespace
4484 * @cmd: command to issue
4485 * @arg: pointer to a struct ifreq in user space
4487 * Issue ioctl functions to devices. This is normally called by the
4488 * user space syscall interfaces but can sometimes be useful for
4489 * other purposes. The return value is the return from the syscall if
4490 * positive or a negative errno code on error.
4493 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4499 /* One special case: SIOCGIFCONF takes ifconf argument
4500 and requires shared lock, because it sleeps writing
4504 if (cmd == SIOCGIFCONF) {
4506 ret = dev_ifconf(net, (char __user *) arg);
4510 if (cmd == SIOCGIFNAME)
4511 return dev_ifname(net, (struct ifreq __user *)arg);
4513 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4516 ifr.ifr_name[IFNAMSIZ-1] = 0;
4518 colon = strchr(ifr.ifr_name, ':');
4523 * See which interface the caller is talking about.
4528 * These ioctl calls:
4529 * - can be done by all.
4530 * - atomic and do not require locking.
4541 dev_load(net, ifr.ifr_name);
4543 ret = dev_ifsioc_locked(net, &ifr, cmd);
4548 if (copy_to_user(arg, &ifr,
4549 sizeof(struct ifreq)))
4555 dev_load(net, ifr.ifr_name);
4557 ret = dev_ethtool(net, &ifr);
4562 if (copy_to_user(arg, &ifr,
4563 sizeof(struct ifreq)))
4569 * These ioctl calls:
4570 * - require superuser power.
4571 * - require strict serialization.
4577 if (!capable(CAP_NET_ADMIN))
4579 dev_load(net, ifr.ifr_name);
4581 ret = dev_ifsioc(net, &ifr, cmd);
4586 if (copy_to_user(arg, &ifr,
4587 sizeof(struct ifreq)))
4593 * These ioctl calls:
4594 * - require superuser power.
4595 * - require strict serialization.
4596 * - do not return a value
4606 case SIOCSIFHWBROADCAST:
4609 case SIOCBONDENSLAVE:
4610 case SIOCBONDRELEASE:
4611 case SIOCBONDSETHWADDR:
4612 case SIOCBONDCHANGEACTIVE:
4616 if (!capable(CAP_NET_ADMIN))
4619 case SIOCBONDSLAVEINFOQUERY:
4620 case SIOCBONDINFOQUERY:
4621 dev_load(net, ifr.ifr_name);
4623 ret = dev_ifsioc(net, &ifr, cmd);
4628 /* Get the per device memory space. We can add this but
4629 * currently do not support it */
4631 /* Set the per device memory buffer space.
4632 * Not applicable in our case */
4637 * Unknown or private ioctl.
4640 if (cmd == SIOCWANDEV ||
4641 (cmd >= SIOCDEVPRIVATE &&
4642 cmd <= SIOCDEVPRIVATE + 15)) {
4643 dev_load(net, ifr.ifr_name);
4645 ret = dev_ifsioc(net, &ifr, cmd);
4647 if (!ret && copy_to_user(arg, &ifr,
4648 sizeof(struct ifreq)))
4652 /* Take care of Wireless Extensions */
4653 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4654 return wext_handle_ioctl(net, &ifr, cmd, arg);
4661 * dev_new_index - allocate an ifindex
4662 * @net: the applicable net namespace
4664 * Returns a suitable unique value for a new device interface
4665 * number. The caller must hold the rtnl semaphore or the
4666 * dev_base_lock to be sure it remains unique.
4668 static int dev_new_index(struct net *net)
4674 if (!__dev_get_by_index(net, ifindex))
4679 /* Delayed registration/unregisteration */
4680 static LIST_HEAD(net_todo_list);
4682 static void net_set_todo(struct net_device *dev)
4684 list_add_tail(&dev->todo_list, &net_todo_list);
4687 static void rollback_registered_many(struct list_head *head)
4689 struct net_device *dev, *tmp;
4691 BUG_ON(dev_boot_phase);
4694 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4695 /* Some devices call without registering
4696 * for initialization unwind. Remove those
4697 * devices and proceed with the remaining.
4699 if (dev->reg_state == NETREG_UNINITIALIZED) {
4700 pr_debug("unregister_netdevice: device %s/%p never "
4701 "was registered\n", dev->name, dev);
4704 list_del(&dev->unreg_list);
4708 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4710 /* If device is running, close it first. */
4713 /* And unlink it from device chain. */
4714 unlist_netdevice(dev);
4716 dev->reg_state = NETREG_UNREGISTERING;
4721 list_for_each_entry(dev, head, unreg_list) {
4722 /* Shutdown queueing discipline. */
4726 /* Notify protocols, that we are about to destroy
4727 this device. They should clean all the things.
4729 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4731 if (!dev->rtnl_link_ops ||
4732 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4733 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4736 * Flush the unicast and multicast chains
4741 if (dev->netdev_ops->ndo_uninit)
4742 dev->netdev_ops->ndo_uninit(dev);
4744 /* Notifier chain MUST detach us from master device. */
4745 WARN_ON(dev->master);
4747 /* Remove entries from kobject tree */
4748 netdev_unregister_kobject(dev);
4751 /* Process any work delayed until the end of the batch */
4752 dev = list_first_entry(head, struct net_device, unreg_list);
4753 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4757 list_for_each_entry(dev, head, unreg_list)
4761 static void rollback_registered(struct net_device *dev)
4765 list_add(&dev->unreg_list, &single);
4766 rollback_registered_many(&single);
4769 static void __netdev_init_queue_locks_one(struct net_device *dev,
4770 struct netdev_queue *dev_queue,
4773 spin_lock_init(&dev_queue->_xmit_lock);
4774 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4775 dev_queue->xmit_lock_owner = -1;
4778 static void netdev_init_queue_locks(struct net_device *dev)
4780 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4781 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4784 unsigned long netdev_fix_features(unsigned long features, const char *name)
4786 /* Fix illegal SG+CSUM combinations. */
4787 if ((features & NETIF_F_SG) &&
4788 !(features & NETIF_F_ALL_CSUM)) {
4790 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4791 "checksum feature.\n", name);
4792 features &= ~NETIF_F_SG;
4795 /* TSO requires that SG is present as well. */
4796 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4798 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4799 "SG feature.\n", name);
4800 features &= ~NETIF_F_TSO;
4803 if (features & NETIF_F_UFO) {
4804 if (!(features & NETIF_F_GEN_CSUM)) {
4806 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4807 "since no NETIF_F_HW_CSUM feature.\n",
4809 features &= ~NETIF_F_UFO;
4812 if (!(features & NETIF_F_SG)) {
4814 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4815 "since no NETIF_F_SG feature.\n", name);
4816 features &= ~NETIF_F_UFO;
4822 EXPORT_SYMBOL(netdev_fix_features);
4825 * netif_stacked_transfer_operstate - transfer operstate
4826 * @rootdev: the root or lower level device to transfer state from
4827 * @dev: the device to transfer operstate to
4829 * Transfer operational state from root to device. This is normally
4830 * called when a stacking relationship exists between the root
4831 * device and the device(a leaf device).
4833 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4834 struct net_device *dev)
4836 if (rootdev->operstate == IF_OPER_DORMANT)
4837 netif_dormant_on(dev);
4839 netif_dormant_off(dev);
4841 if (netif_carrier_ok(rootdev)) {
4842 if (!netif_carrier_ok(dev))
4843 netif_carrier_on(dev);
4845 if (netif_carrier_ok(dev))
4846 netif_carrier_off(dev);
4849 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4852 * register_netdevice - register a network device
4853 * @dev: device to register
4855 * Take a completed network device structure and add it to the kernel
4856 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4857 * chain. 0 is returned on success. A negative errno code is returned
4858 * on a failure to set up the device, or if the name is a duplicate.
4860 * Callers must hold the rtnl semaphore. You may want
4861 * register_netdev() instead of this.
4864 * The locking appears insufficient to guarantee two parallel registers
4865 * will not get the same name.
4868 int register_netdevice(struct net_device *dev)
4871 struct net *net = dev_net(dev);
4873 BUG_ON(dev_boot_phase);
4878 /* When net_device's are persistent, this will be fatal. */
4879 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4882 spin_lock_init(&dev->addr_list_lock);
4883 netdev_set_addr_lockdep_class(dev);
4884 netdev_init_queue_locks(dev);
4889 if (!dev->num_rx_queues) {
4891 * Allocate a single RX queue if driver never called
4895 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
4901 dev->_rx->first = dev->_rx;
4902 atomic_set(&dev->_rx->count, 1);
4903 dev->num_rx_queues = 1;
4906 /* Init, if this function is available */
4907 if (dev->netdev_ops->ndo_init) {
4908 ret = dev->netdev_ops->ndo_init(dev);
4916 ret = dev_get_valid_name(net, dev->name, dev->name, 0);
4920 dev->ifindex = dev_new_index(net);
4921 if (dev->iflink == -1)
4922 dev->iflink = dev->ifindex;
4924 /* Fix illegal checksum combinations */
4925 if ((dev->features & NETIF_F_HW_CSUM) &&
4926 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4927 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4929 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4932 if ((dev->features & NETIF_F_NO_CSUM) &&
4933 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4934 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4936 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4939 dev->features = netdev_fix_features(dev->features, dev->name);
4941 /* Enable software GSO if SG is supported. */
4942 if (dev->features & NETIF_F_SG)
4943 dev->features |= NETIF_F_GSO;
4945 netdev_initialize_kobject(dev);
4947 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
4948 ret = notifier_to_errno(ret);
4952 ret = netdev_register_kobject(dev);
4955 dev->reg_state = NETREG_REGISTERED;
4958 * Default initial state at registry is that the
4959 * device is present.
4962 set_bit(__LINK_STATE_PRESENT, &dev->state);
4964 dev_init_scheduler(dev);
4966 list_netdevice(dev);
4968 /* Notify protocols, that a new device appeared. */
4969 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4970 ret = notifier_to_errno(ret);
4972 rollback_registered(dev);
4973 dev->reg_state = NETREG_UNREGISTERED;
4976 * Prevent userspace races by waiting until the network
4977 * device is fully setup before sending notifications.
4979 if (!dev->rtnl_link_ops ||
4980 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4981 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
4987 if (dev->netdev_ops->ndo_uninit)
4988 dev->netdev_ops->ndo_uninit(dev);
4991 EXPORT_SYMBOL(register_netdevice);
4994 * init_dummy_netdev - init a dummy network device for NAPI
4995 * @dev: device to init
4997 * This takes a network device structure and initialize the minimum
4998 * amount of fields so it can be used to schedule NAPI polls without
4999 * registering a full blown interface. This is to be used by drivers
5000 * that need to tie several hardware interfaces to a single NAPI
5001 * poll scheduler due to HW limitations.
5003 int init_dummy_netdev(struct net_device *dev)
5005 /* Clear everything. Note we don't initialize spinlocks
5006 * are they aren't supposed to be taken by any of the
5007 * NAPI code and this dummy netdev is supposed to be
5008 * only ever used for NAPI polls
5010 memset(dev, 0, sizeof(struct net_device));
5012 /* make sure we BUG if trying to hit standard
5013 * register/unregister code path
5015 dev->reg_state = NETREG_DUMMY;
5017 /* initialize the ref count */
5018 atomic_set(&dev->refcnt, 1);
5020 /* NAPI wants this */
5021 INIT_LIST_HEAD(&dev->napi_list);
5023 /* a dummy interface is started by default */
5024 set_bit(__LINK_STATE_PRESENT, &dev->state);
5025 set_bit(__LINK_STATE_START, &dev->state);
5029 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5033 * register_netdev - register a network device
5034 * @dev: device to register
5036 * Take a completed network device structure and add it to the kernel
5037 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5038 * chain. 0 is returned on success. A negative errno code is returned
5039 * on a failure to set up the device, or if the name is a duplicate.
5041 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5042 * and expands the device name if you passed a format string to
5045 int register_netdev(struct net_device *dev)
5052 * If the name is a format string the caller wants us to do a
5055 if (strchr(dev->name, '%')) {
5056 err = dev_alloc_name(dev, dev->name);
5061 err = register_netdevice(dev);
5066 EXPORT_SYMBOL(register_netdev);
5069 * netdev_wait_allrefs - wait until all references are gone.
5071 * This is called when unregistering network devices.
5073 * Any protocol or device that holds a reference should register
5074 * for netdevice notification, and cleanup and put back the
5075 * reference if they receive an UNREGISTER event.
5076 * We can get stuck here if buggy protocols don't correctly
5079 static void netdev_wait_allrefs(struct net_device *dev)
5081 unsigned long rebroadcast_time, warning_time;
5083 linkwatch_forget_dev(dev);
5085 rebroadcast_time = warning_time = jiffies;
5086 while (atomic_read(&dev->refcnt) != 0) {
5087 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5090 /* Rebroadcast unregister notification */
5091 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5092 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5093 * should have already handle it the first time */
5095 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5097 /* We must not have linkwatch events
5098 * pending on unregister. If this
5099 * happens, we simply run the queue
5100 * unscheduled, resulting in a noop
5103 linkwatch_run_queue();
5108 rebroadcast_time = jiffies;
5113 if (time_after(jiffies, warning_time + 10 * HZ)) {
5114 printk(KERN_EMERG "unregister_netdevice: "
5115 "waiting for %s to become free. Usage "
5117 dev->name, atomic_read(&dev->refcnt));
5118 warning_time = jiffies;
5127 * register_netdevice(x1);
5128 * register_netdevice(x2);
5130 * unregister_netdevice(y1);
5131 * unregister_netdevice(y2);
5137 * We are invoked by rtnl_unlock().
5138 * This allows us to deal with problems:
5139 * 1) We can delete sysfs objects which invoke hotplug
5140 * without deadlocking with linkwatch via keventd.
5141 * 2) Since we run with the RTNL semaphore not held, we can sleep
5142 * safely in order to wait for the netdev refcnt to drop to zero.
5144 * We must not return until all unregister events added during
5145 * the interval the lock was held have been completed.
5147 void netdev_run_todo(void)
5149 struct list_head list;
5151 /* Snapshot list, allow later requests */
5152 list_replace_init(&net_todo_list, &list);
5156 while (!list_empty(&list)) {
5157 struct net_device *dev
5158 = list_first_entry(&list, struct net_device, todo_list);
5159 list_del(&dev->todo_list);
5161 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5162 printk(KERN_ERR "network todo '%s' but state %d\n",
5163 dev->name, dev->reg_state);
5168 dev->reg_state = NETREG_UNREGISTERED;
5170 on_each_cpu(flush_backlog, dev, 1);
5172 netdev_wait_allrefs(dev);
5175 BUG_ON(atomic_read(&dev->refcnt));
5176 WARN_ON(dev->ip_ptr);
5177 WARN_ON(dev->ip6_ptr);
5178 WARN_ON(dev->dn_ptr);
5180 if (dev->destructor)
5181 dev->destructor(dev);
5183 /* Free network device */
5184 kobject_put(&dev->dev.kobj);
5189 * dev_txq_stats_fold - fold tx_queues stats
5190 * @dev: device to get statistics from
5191 * @stats: struct net_device_stats to hold results
5193 void dev_txq_stats_fold(const struct net_device *dev,
5194 struct net_device_stats *stats)
5196 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5198 struct netdev_queue *txq;
5200 for (i = 0; i < dev->num_tx_queues; i++) {
5201 txq = netdev_get_tx_queue(dev, i);
5202 tx_bytes += txq->tx_bytes;
5203 tx_packets += txq->tx_packets;
5204 tx_dropped += txq->tx_dropped;
5206 if (tx_bytes || tx_packets || tx_dropped) {
5207 stats->tx_bytes = tx_bytes;
5208 stats->tx_packets = tx_packets;
5209 stats->tx_dropped = tx_dropped;
5212 EXPORT_SYMBOL(dev_txq_stats_fold);
5215 * dev_get_stats - get network device statistics
5216 * @dev: device to get statistics from
5218 * Get network statistics from device. The device driver may provide
5219 * its own method by setting dev->netdev_ops->get_stats; otherwise
5220 * the internal statistics structure is used.
5222 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5224 const struct net_device_ops *ops = dev->netdev_ops;
5226 if (ops->ndo_get_stats)
5227 return ops->ndo_get_stats(dev);
5229 dev_txq_stats_fold(dev, &dev->stats);
5232 EXPORT_SYMBOL(dev_get_stats);
5234 static void netdev_init_one_queue(struct net_device *dev,
5235 struct netdev_queue *queue,
5241 static void netdev_init_queues(struct net_device *dev)
5243 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5244 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5245 spin_lock_init(&dev->tx_global_lock);
5249 * alloc_netdev_mq - allocate network device
5250 * @sizeof_priv: size of private data to allocate space for
5251 * @name: device name format string
5252 * @setup: callback to initialize device
5253 * @queue_count: the number of subqueues to allocate
5255 * Allocates a struct net_device with private data area for driver use
5256 * and performs basic initialization. Also allocates subquue structs
5257 * for each queue on the device at the end of the netdevice.
5259 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5260 void (*setup)(struct net_device *), unsigned int queue_count)
5262 struct netdev_queue *tx;
5263 struct net_device *dev;
5265 struct net_device *p;
5267 struct netdev_rx_queue *rx;
5271 BUG_ON(strlen(name) >= sizeof(dev->name));
5273 alloc_size = sizeof(struct net_device);
5275 /* ensure 32-byte alignment of private area */
5276 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5277 alloc_size += sizeof_priv;
5279 /* ensure 32-byte alignment of whole construct */
5280 alloc_size += NETDEV_ALIGN - 1;
5282 p = kzalloc(alloc_size, GFP_KERNEL);
5284 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5288 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5290 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5296 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5298 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5303 atomic_set(&rx->count, queue_count);
5306 * Set a pointer to first element in the array which holds the
5309 for (i = 0; i < queue_count; i++)
5313 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5314 dev->padded = (char *)dev - (char *)p;
5316 if (dev_addr_init(dev))
5322 dev_net_set(dev, &init_net);
5325 dev->num_tx_queues = queue_count;
5326 dev->real_num_tx_queues = queue_count;
5330 dev->num_rx_queues = queue_count;
5333 dev->gso_max_size = GSO_MAX_SIZE;
5335 netdev_init_queues(dev);
5337 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5338 dev->ethtool_ntuple_list.count = 0;
5339 INIT_LIST_HEAD(&dev->napi_list);
5340 INIT_LIST_HEAD(&dev->unreg_list);
5341 INIT_LIST_HEAD(&dev->link_watch_list);
5342 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5344 strcpy(dev->name, name);
5357 EXPORT_SYMBOL(alloc_netdev_mq);
5360 * free_netdev - free network device
5363 * This function does the last stage of destroying an allocated device
5364 * interface. The reference to the device object is released.
5365 * If this is the last reference then it will be freed.
5367 void free_netdev(struct net_device *dev)
5369 struct napi_struct *p, *n;
5371 release_net(dev_net(dev));
5375 /* Flush device addresses */
5376 dev_addr_flush(dev);
5378 /* Clear ethtool n-tuple list */
5379 ethtool_ntuple_flush(dev);
5381 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5384 /* Compatibility with error handling in drivers */
5385 if (dev->reg_state == NETREG_UNINITIALIZED) {
5386 kfree((char *)dev - dev->padded);
5390 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5391 dev->reg_state = NETREG_RELEASED;
5393 /* will free via device release */
5394 put_device(&dev->dev);
5396 EXPORT_SYMBOL(free_netdev);
5399 * synchronize_net - Synchronize with packet receive processing
5401 * Wait for packets currently being received to be done.
5402 * Does not block later packets from starting.
5404 void synchronize_net(void)
5409 EXPORT_SYMBOL(synchronize_net);
5412 * unregister_netdevice_queue - remove device from the kernel
5416 * This function shuts down a device interface and removes it
5417 * from the kernel tables.
5418 * If head not NULL, device is queued to be unregistered later.
5420 * Callers must hold the rtnl semaphore. You may want
5421 * unregister_netdev() instead of this.
5424 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5429 list_move_tail(&dev->unreg_list, head);
5431 rollback_registered(dev);
5432 /* Finish processing unregister after unlock */
5436 EXPORT_SYMBOL(unregister_netdevice_queue);
5439 * unregister_netdevice_many - unregister many devices
5440 * @head: list of devices
5442 void unregister_netdevice_many(struct list_head *head)
5444 struct net_device *dev;
5446 if (!list_empty(head)) {
5447 rollback_registered_many(head);
5448 list_for_each_entry(dev, head, unreg_list)
5452 EXPORT_SYMBOL(unregister_netdevice_many);
5455 * unregister_netdev - remove device from the kernel
5458 * This function shuts down a device interface and removes it
5459 * from the kernel tables.
5461 * This is just a wrapper for unregister_netdevice that takes
5462 * the rtnl semaphore. In general you want to use this and not
5463 * unregister_netdevice.
5465 void unregister_netdev(struct net_device *dev)
5468 unregister_netdevice(dev);
5471 EXPORT_SYMBOL(unregister_netdev);
5474 * dev_change_net_namespace - move device to different nethost namespace
5476 * @net: network namespace
5477 * @pat: If not NULL name pattern to try if the current device name
5478 * is already taken in the destination network namespace.
5480 * This function shuts down a device interface and moves it
5481 * to a new network namespace. On success 0 is returned, on
5482 * a failure a netagive errno code is returned.
5484 * Callers must hold the rtnl semaphore.
5487 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5493 /* Don't allow namespace local devices to be moved. */
5495 if (dev->features & NETIF_F_NETNS_LOCAL)
5499 /* Don't allow real devices to be moved when sysfs
5503 if (dev->dev.parent)
5507 /* Ensure the device has been registrered */
5509 if (dev->reg_state != NETREG_REGISTERED)
5512 /* Get out if there is nothing todo */
5514 if (net_eq(dev_net(dev), net))
5517 /* Pick the destination device name, and ensure
5518 * we can use it in the destination network namespace.
5521 if (__dev_get_by_name(net, dev->name)) {
5522 /* We get here if we can't use the current device name */
5525 if (dev_get_valid_name(net, pat, dev->name, 1))
5530 * And now a mini version of register_netdevice unregister_netdevice.
5533 /* If device is running close it first. */
5536 /* And unlink it from device chain */
5538 unlist_netdevice(dev);
5542 /* Shutdown queueing discipline. */
5545 /* Notify protocols, that we are about to destroy
5546 this device. They should clean all the things.
5548 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5549 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5552 * Flush the unicast and multicast chains
5557 netdev_unregister_kobject(dev);
5559 /* Actually switch the network namespace */
5560 dev_net_set(dev, net);
5562 /* If there is an ifindex conflict assign a new one */
5563 if (__dev_get_by_index(net, dev->ifindex)) {
5564 int iflink = (dev->iflink == dev->ifindex);
5565 dev->ifindex = dev_new_index(net);
5567 dev->iflink = dev->ifindex;
5570 /* Fixup kobjects */
5571 err = netdev_register_kobject(dev);
5574 /* Add the device back in the hashes */
5575 list_netdevice(dev);
5577 /* Notify protocols, that a new device appeared. */
5578 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5581 * Prevent userspace races by waiting until the network
5582 * device is fully setup before sending notifications.
5584 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5591 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5593 static int dev_cpu_callback(struct notifier_block *nfb,
5594 unsigned long action,
5597 struct sk_buff **list_skb;
5598 struct Qdisc **list_net;
5599 struct sk_buff *skb;
5600 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5601 struct softnet_data *sd, *oldsd;
5603 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5606 local_irq_disable();
5607 cpu = smp_processor_id();
5608 sd = &per_cpu(softnet_data, cpu);
5609 oldsd = &per_cpu(softnet_data, oldcpu);
5611 /* Find end of our completion_queue. */
5612 list_skb = &sd->completion_queue;
5614 list_skb = &(*list_skb)->next;
5615 /* Append completion queue from offline CPU. */
5616 *list_skb = oldsd->completion_queue;
5617 oldsd->completion_queue = NULL;
5619 /* Find end of our output_queue. */
5620 list_net = &sd->output_queue;
5622 list_net = &(*list_net)->next_sched;
5623 /* Append output queue from offline CPU. */
5624 *list_net = oldsd->output_queue;
5625 oldsd->output_queue = NULL;
5627 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5630 /* Process offline CPU's input_pkt_queue */
5631 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5633 input_queue_head_incr(oldsd);
5641 * netdev_increment_features - increment feature set by one
5642 * @all: current feature set
5643 * @one: new feature set
5644 * @mask: mask feature set
5646 * Computes a new feature set after adding a device with feature set
5647 * @one to the master device with current feature set @all. Will not
5648 * enable anything that is off in @mask. Returns the new feature set.
5650 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5653 /* If device needs checksumming, downgrade to it. */
5654 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5655 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5656 else if (mask & NETIF_F_ALL_CSUM) {
5657 /* If one device supports v4/v6 checksumming, set for all. */
5658 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5659 !(all & NETIF_F_GEN_CSUM)) {
5660 all &= ~NETIF_F_ALL_CSUM;
5661 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5664 /* If one device supports hw checksumming, set for all. */
5665 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5666 all &= ~NETIF_F_ALL_CSUM;
5667 all |= NETIF_F_HW_CSUM;
5671 one |= NETIF_F_ALL_CSUM;
5673 one |= all & NETIF_F_ONE_FOR_ALL;
5674 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5675 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5679 EXPORT_SYMBOL(netdev_increment_features);
5681 static struct hlist_head *netdev_create_hash(void)
5684 struct hlist_head *hash;
5686 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5688 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5689 INIT_HLIST_HEAD(&hash[i]);
5694 /* Initialize per network namespace state */
5695 static int __net_init netdev_init(struct net *net)
5697 INIT_LIST_HEAD(&net->dev_base_head);
5699 net->dev_name_head = netdev_create_hash();
5700 if (net->dev_name_head == NULL)
5703 net->dev_index_head = netdev_create_hash();
5704 if (net->dev_index_head == NULL)
5710 kfree(net->dev_name_head);
5716 * netdev_drivername - network driver for the device
5717 * @dev: network device
5718 * @buffer: buffer for resulting name
5719 * @len: size of buffer
5721 * Determine network driver for device.
5723 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5725 const struct device_driver *driver;
5726 const struct device *parent;
5728 if (len <= 0 || !buffer)
5732 parent = dev->dev.parent;
5737 driver = parent->driver;
5738 if (driver && driver->name)
5739 strlcpy(buffer, driver->name, len);
5743 static void __net_exit netdev_exit(struct net *net)
5745 kfree(net->dev_name_head);
5746 kfree(net->dev_index_head);
5749 static struct pernet_operations __net_initdata netdev_net_ops = {
5750 .init = netdev_init,
5751 .exit = netdev_exit,
5754 static void __net_exit default_device_exit(struct net *net)
5756 struct net_device *dev, *aux;
5758 * Push all migratable network devices back to the
5759 * initial network namespace
5762 for_each_netdev_safe(net, dev, aux) {
5764 char fb_name[IFNAMSIZ];
5766 /* Ignore unmoveable devices (i.e. loopback) */
5767 if (dev->features & NETIF_F_NETNS_LOCAL)
5770 /* Leave virtual devices for the generic cleanup */
5771 if (dev->rtnl_link_ops)
5774 /* Push remaing network devices to init_net */
5775 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5776 err = dev_change_net_namespace(dev, &init_net, fb_name);
5778 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5779 __func__, dev->name, err);
5786 static void __net_exit default_device_exit_batch(struct list_head *net_list)
5788 /* At exit all network devices most be removed from a network
5789 * namespace. Do this in the reverse order of registeration.
5790 * Do this across as many network namespaces as possible to
5791 * improve batching efficiency.
5793 struct net_device *dev;
5795 LIST_HEAD(dev_kill_list);
5798 list_for_each_entry(net, net_list, exit_list) {
5799 for_each_netdev_reverse(net, dev) {
5800 if (dev->rtnl_link_ops)
5801 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
5803 unregister_netdevice_queue(dev, &dev_kill_list);
5806 unregister_netdevice_many(&dev_kill_list);
5810 static struct pernet_operations __net_initdata default_device_ops = {
5811 .exit = default_device_exit,
5812 .exit_batch = default_device_exit_batch,
5816 * Initialize the DEV module. At boot time this walks the device list and
5817 * unhooks any devices that fail to initialise (normally hardware not
5818 * present) and leaves us with a valid list of present and active devices.
5823 * This is called single threaded during boot, so no need
5824 * to take the rtnl semaphore.
5826 static int __init net_dev_init(void)
5828 int i, rc = -ENOMEM;
5830 BUG_ON(!dev_boot_phase);
5832 if (dev_proc_init())
5835 if (netdev_kobject_init())
5838 INIT_LIST_HEAD(&ptype_all);
5839 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5840 INIT_LIST_HEAD(&ptype_base[i]);
5842 if (register_pernet_subsys(&netdev_net_ops))
5846 * Initialise the packet receive queues.
5849 for_each_possible_cpu(i) {
5850 struct softnet_data *sd = &per_cpu(softnet_data, i);
5852 skb_queue_head_init(&sd->input_pkt_queue);
5853 sd->completion_queue = NULL;
5854 INIT_LIST_HEAD(&sd->poll_list);
5857 sd->csd.func = rps_trigger_softirq;
5863 sd->backlog.poll = process_backlog;
5864 sd->backlog.weight = weight_p;
5865 sd->backlog.gro_list = NULL;
5866 sd->backlog.gro_count = 0;
5871 /* The loopback device is special if any other network devices
5872 * is present in a network namespace the loopback device must
5873 * be present. Since we now dynamically allocate and free the
5874 * loopback device ensure this invariant is maintained by
5875 * keeping the loopback device as the first device on the
5876 * list of network devices. Ensuring the loopback devices
5877 * is the first device that appears and the last network device
5880 if (register_pernet_device(&loopback_net_ops))
5883 if (register_pernet_device(&default_device_ops))
5886 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5887 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5889 hotcpu_notifier(dev_cpu_callback, 0);
5897 subsys_initcall(net_dev_init);
5899 static int __init initialize_hashrnd(void)
5901 get_random_bytes(&hashrnd, sizeof(hashrnd));
5905 late_initcall_sync(initialize_hashrnd);