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 = NULL;
1561 *sd->output_queue_tailp = q;
1562 sd->output_queue_tailp = &q->next_sched;
1563 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1564 local_irq_restore(flags);
1567 void __netif_schedule(struct Qdisc *q)
1569 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1570 __netif_reschedule(q);
1572 EXPORT_SYMBOL(__netif_schedule);
1574 void dev_kfree_skb_irq(struct sk_buff *skb)
1576 if (atomic_dec_and_test(&skb->users)) {
1577 struct softnet_data *sd;
1578 unsigned long flags;
1580 local_irq_save(flags);
1581 sd = &__get_cpu_var(softnet_data);
1582 skb->next = sd->completion_queue;
1583 sd->completion_queue = skb;
1584 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1585 local_irq_restore(flags);
1588 EXPORT_SYMBOL(dev_kfree_skb_irq);
1590 void dev_kfree_skb_any(struct sk_buff *skb)
1592 if (in_irq() || irqs_disabled())
1593 dev_kfree_skb_irq(skb);
1597 EXPORT_SYMBOL(dev_kfree_skb_any);
1601 * netif_device_detach - mark device as removed
1602 * @dev: network device
1604 * Mark device as removed from system and therefore no longer available.
1606 void netif_device_detach(struct net_device *dev)
1608 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1609 netif_running(dev)) {
1610 netif_tx_stop_all_queues(dev);
1613 EXPORT_SYMBOL(netif_device_detach);
1616 * netif_device_attach - mark device as attached
1617 * @dev: network device
1619 * Mark device as attached from system and restart if needed.
1621 void netif_device_attach(struct net_device *dev)
1623 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1624 netif_running(dev)) {
1625 netif_tx_wake_all_queues(dev);
1626 __netdev_watchdog_up(dev);
1629 EXPORT_SYMBOL(netif_device_attach);
1631 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1633 return ((features & NETIF_F_GEN_CSUM) ||
1634 ((features & NETIF_F_IP_CSUM) &&
1635 protocol == htons(ETH_P_IP)) ||
1636 ((features & NETIF_F_IPV6_CSUM) &&
1637 protocol == htons(ETH_P_IPV6)) ||
1638 ((features & NETIF_F_FCOE_CRC) &&
1639 protocol == htons(ETH_P_FCOE)));
1642 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1644 if (can_checksum_protocol(dev->features, skb->protocol))
1647 if (skb->protocol == htons(ETH_P_8021Q)) {
1648 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1649 if (can_checksum_protocol(dev->features & dev->vlan_features,
1650 veh->h_vlan_encapsulated_proto))
1658 * skb_dev_set -- assign a new device to a buffer
1659 * @skb: buffer for the new device
1660 * @dev: network device
1662 * If an skb is owned by a device already, we have to reset
1663 * all data private to the namespace a device belongs to
1664 * before assigning it a new device.
1666 #ifdef CONFIG_NET_NS
1667 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1670 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1673 skb_init_secmark(skb);
1677 skb->ipvs_property = 0;
1678 #ifdef CONFIG_NET_SCHED
1684 EXPORT_SYMBOL(skb_set_dev);
1685 #endif /* CONFIG_NET_NS */
1688 * Invalidate hardware checksum when packet is to be mangled, and
1689 * complete checksum manually on outgoing path.
1691 int skb_checksum_help(struct sk_buff *skb)
1694 int ret = 0, offset;
1696 if (skb->ip_summed == CHECKSUM_COMPLETE)
1697 goto out_set_summed;
1699 if (unlikely(skb_shinfo(skb)->gso_size)) {
1700 /* Let GSO fix up the checksum. */
1701 goto out_set_summed;
1704 offset = skb->csum_start - skb_headroom(skb);
1705 BUG_ON(offset >= skb_headlen(skb));
1706 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1708 offset += skb->csum_offset;
1709 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1711 if (skb_cloned(skb) &&
1712 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1713 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1718 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1720 skb->ip_summed = CHECKSUM_NONE;
1724 EXPORT_SYMBOL(skb_checksum_help);
1727 * skb_gso_segment - Perform segmentation on skb.
1728 * @skb: buffer to segment
1729 * @features: features for the output path (see dev->features)
1731 * This function segments the given skb and returns a list of segments.
1733 * It may return NULL if the skb requires no segmentation. This is
1734 * only possible when GSO is used for verifying header integrity.
1736 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1738 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1739 struct packet_type *ptype;
1740 __be16 type = skb->protocol;
1743 skb_reset_mac_header(skb);
1744 skb->mac_len = skb->network_header - skb->mac_header;
1745 __skb_pull(skb, skb->mac_len);
1747 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1748 struct net_device *dev = skb->dev;
1749 struct ethtool_drvinfo info = {};
1751 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1752 dev->ethtool_ops->get_drvinfo(dev, &info);
1754 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1756 info.driver, dev ? dev->features : 0L,
1757 skb->sk ? skb->sk->sk_route_caps : 0L,
1758 skb->len, skb->data_len, skb->ip_summed);
1760 if (skb_header_cloned(skb) &&
1761 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1762 return ERR_PTR(err);
1766 list_for_each_entry_rcu(ptype,
1767 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1768 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1769 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1770 err = ptype->gso_send_check(skb);
1771 segs = ERR_PTR(err);
1772 if (err || skb_gso_ok(skb, features))
1774 __skb_push(skb, (skb->data -
1775 skb_network_header(skb)));
1777 segs = ptype->gso_segment(skb, features);
1783 __skb_push(skb, skb->data - skb_mac_header(skb));
1787 EXPORT_SYMBOL(skb_gso_segment);
1789 /* Take action when hardware reception checksum errors are detected. */
1791 void netdev_rx_csum_fault(struct net_device *dev)
1793 if (net_ratelimit()) {
1794 printk(KERN_ERR "%s: hw csum failure.\n",
1795 dev ? dev->name : "<unknown>");
1799 EXPORT_SYMBOL(netdev_rx_csum_fault);
1802 /* Actually, we should eliminate this check as soon as we know, that:
1803 * 1. IOMMU is present and allows to map all the memory.
1804 * 2. No high memory really exists on this machine.
1807 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1809 #ifdef CONFIG_HIGHMEM
1811 if (!(dev->features & NETIF_F_HIGHDMA)) {
1812 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1813 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1817 if (PCI_DMA_BUS_IS_PHYS) {
1818 struct device *pdev = dev->dev.parent;
1822 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1823 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1824 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1833 void (*destructor)(struct sk_buff *skb);
1836 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1838 static void dev_gso_skb_destructor(struct sk_buff *skb)
1840 struct dev_gso_cb *cb;
1843 struct sk_buff *nskb = skb->next;
1845 skb->next = nskb->next;
1848 } while (skb->next);
1850 cb = DEV_GSO_CB(skb);
1852 cb->destructor(skb);
1856 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1857 * @skb: buffer to segment
1859 * This function segments the given skb and stores the list of segments
1862 static int dev_gso_segment(struct sk_buff *skb)
1864 struct net_device *dev = skb->dev;
1865 struct sk_buff *segs;
1866 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1869 segs = skb_gso_segment(skb, features);
1871 /* Verifying header integrity only. */
1876 return PTR_ERR(segs);
1879 DEV_GSO_CB(skb)->destructor = skb->destructor;
1880 skb->destructor = dev_gso_skb_destructor;
1886 * Try to orphan skb early, right before transmission by the device.
1887 * We cannot orphan skb if tx timestamp is requested, since
1888 * drivers need to call skb_tstamp_tx() to send the timestamp.
1890 static inline void skb_orphan_try(struct sk_buff *skb)
1892 if (!skb_tx(skb)->flags)
1896 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1897 struct netdev_queue *txq)
1899 const struct net_device_ops *ops = dev->netdev_ops;
1900 int rc = NETDEV_TX_OK;
1902 if (likely(!skb->next)) {
1903 if (!list_empty(&ptype_all))
1904 dev_queue_xmit_nit(skb, dev);
1907 * If device doesnt need skb->dst, release it right now while
1908 * its hot in this cpu cache
1910 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1913 skb_orphan_try(skb);
1915 if (netif_needs_gso(dev, skb)) {
1916 if (unlikely(dev_gso_segment(skb)))
1922 rc = ops->ndo_start_xmit(skb, dev);
1923 if (rc == NETDEV_TX_OK)
1924 txq_trans_update(txq);
1930 struct sk_buff *nskb = skb->next;
1932 skb->next = nskb->next;
1936 * If device doesnt need nskb->dst, release it right now while
1937 * its hot in this cpu cache
1939 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1942 rc = ops->ndo_start_xmit(nskb, dev);
1943 if (unlikely(rc != NETDEV_TX_OK)) {
1944 if (rc & ~NETDEV_TX_MASK)
1945 goto out_kfree_gso_skb;
1946 nskb->next = skb->next;
1950 txq_trans_update(txq);
1951 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1952 return NETDEV_TX_BUSY;
1953 } while (skb->next);
1956 if (likely(skb->next == NULL))
1957 skb->destructor = DEV_GSO_CB(skb)->destructor;
1963 static u32 hashrnd __read_mostly;
1965 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1969 if (skb_rx_queue_recorded(skb)) {
1970 hash = skb_get_rx_queue(skb);
1971 while (unlikely(hash >= dev->real_num_tx_queues))
1972 hash -= dev->real_num_tx_queues;
1976 if (skb->sk && skb->sk->sk_hash)
1977 hash = skb->sk->sk_hash;
1979 hash = (__force u16) skb->protocol;
1981 hash = jhash_1word(hash, hashrnd);
1983 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1985 EXPORT_SYMBOL(skb_tx_hash);
1987 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
1989 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
1990 if (net_ratelimit()) {
1991 pr_warning("%s selects TX queue %d, but "
1992 "real number of TX queues is %d\n",
1993 dev->name, queue_index, dev->real_num_tx_queues);
2000 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2001 struct sk_buff *skb)
2004 struct sock *sk = skb->sk;
2006 if (sk_tx_queue_recorded(sk)) {
2007 queue_index = sk_tx_queue_get(sk);
2009 const struct net_device_ops *ops = dev->netdev_ops;
2011 if (ops->ndo_select_queue) {
2012 queue_index = ops->ndo_select_queue(dev, skb);
2013 queue_index = dev_cap_txqueue(dev, queue_index);
2016 if (dev->real_num_tx_queues > 1)
2017 queue_index = skb_tx_hash(dev, skb);
2020 struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
2022 if (dst && skb_dst(skb) == dst)
2023 sk_tx_queue_set(sk, queue_index);
2028 skb_set_queue_mapping(skb, queue_index);
2029 return netdev_get_tx_queue(dev, queue_index);
2032 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2033 struct net_device *dev,
2034 struct netdev_queue *txq)
2036 spinlock_t *root_lock = qdisc_lock(q);
2039 spin_lock(root_lock);
2040 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2043 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2044 !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
2046 * This is a work-conserving queue; there are no old skbs
2047 * waiting to be sent out; and the qdisc is not running -
2048 * xmit the skb directly.
2050 __qdisc_update_bstats(q, skb->len);
2051 if (sch_direct_xmit(skb, q, dev, txq, root_lock))
2054 clear_bit(__QDISC_STATE_RUNNING, &q->state);
2056 rc = NET_XMIT_SUCCESS;
2058 rc = qdisc_enqueue_root(skb, q);
2061 spin_unlock(root_lock);
2067 * Returns true if either:
2068 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2069 * 2. skb is fragmented and the device does not support SG, or if
2070 * at least one of fragments is in highmem and device does not
2071 * support DMA from it.
2073 static inline int skb_needs_linearize(struct sk_buff *skb,
2074 struct net_device *dev)
2076 return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
2077 (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
2078 illegal_highdma(dev, skb)));
2082 * dev_queue_xmit - transmit a buffer
2083 * @skb: buffer to transmit
2085 * Queue a buffer for transmission to a network device. The caller must
2086 * have set the device and priority and built the buffer before calling
2087 * this function. The function can be called from an interrupt.
2089 * A negative errno code is returned on a failure. A success does not
2090 * guarantee the frame will be transmitted as it may be dropped due
2091 * to congestion or traffic shaping.
2093 * -----------------------------------------------------------------------------------
2094 * I notice this method can also return errors from the queue disciplines,
2095 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2098 * Regardless of the return value, the skb is consumed, so it is currently
2099 * difficult to retry a send to this method. (You can bump the ref count
2100 * before sending to hold a reference for retry if you are careful.)
2102 * When calling this method, interrupts MUST be enabled. This is because
2103 * the BH enable code must have IRQs enabled so that it will not deadlock.
2106 int dev_queue_xmit(struct sk_buff *skb)
2108 struct net_device *dev = skb->dev;
2109 struct netdev_queue *txq;
2113 /* GSO will handle the following emulations directly. */
2114 if (netif_needs_gso(dev, skb))
2117 /* Convert a paged skb to linear, if required */
2118 if (skb_needs_linearize(skb, dev) && __skb_linearize(skb))
2121 /* If packet is not checksummed and device does not support
2122 * checksumming for this protocol, complete checksumming here.
2124 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2125 skb_set_transport_header(skb, skb->csum_start -
2127 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
2132 /* Disable soft irqs for various locks below. Also
2133 * stops preemption for RCU.
2137 txq = dev_pick_tx(dev, skb);
2138 q = rcu_dereference_bh(txq->qdisc);
2140 #ifdef CONFIG_NET_CLS_ACT
2141 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2144 rc = __dev_xmit_skb(skb, q, dev, txq);
2148 /* The device has no queue. Common case for software devices:
2149 loopback, all the sorts of tunnels...
2151 Really, it is unlikely that netif_tx_lock protection is necessary
2152 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2154 However, it is possible, that they rely on protection
2157 Check this and shot the lock. It is not prone from deadlocks.
2158 Either shot noqueue qdisc, it is even simpler 8)
2160 if (dev->flags & IFF_UP) {
2161 int cpu = smp_processor_id(); /* ok because BHs are off */
2163 if (txq->xmit_lock_owner != cpu) {
2165 HARD_TX_LOCK(dev, txq, cpu);
2167 if (!netif_tx_queue_stopped(txq)) {
2168 rc = dev_hard_start_xmit(skb, dev, txq);
2169 if (dev_xmit_complete(rc)) {
2170 HARD_TX_UNLOCK(dev, txq);
2174 HARD_TX_UNLOCK(dev, txq);
2175 if (net_ratelimit())
2176 printk(KERN_CRIT "Virtual device %s asks to "
2177 "queue packet!\n", dev->name);
2179 /* Recursion is detected! It is possible,
2181 if (net_ratelimit())
2182 printk(KERN_CRIT "Dead loop on virtual device "
2183 "%s, fix it urgently!\n", dev->name);
2188 rcu_read_unlock_bh();
2194 rcu_read_unlock_bh();
2197 EXPORT_SYMBOL(dev_queue_xmit);
2200 /*=======================================================================
2202 =======================================================================*/
2204 int netdev_max_backlog __read_mostly = 1000;
2205 int netdev_budget __read_mostly = 300;
2206 int weight_p __read_mostly = 64; /* old backlog weight */
2208 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
2212 /* One global table that all flow-based protocols share. */
2213 struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
2214 EXPORT_SYMBOL(rps_sock_flow_table);
2217 * get_rps_cpu is called from netif_receive_skb and returns the target
2218 * CPU from the RPS map of the receiving queue for a given skb.
2219 * rcu_read_lock must be held on entry.
2221 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2222 struct rps_dev_flow **rflowp)
2224 struct ipv6hdr *ip6;
2226 struct netdev_rx_queue *rxqueue;
2227 struct rps_map *map;
2228 struct rps_dev_flow_table *flow_table;
2229 struct rps_sock_flow_table *sock_flow_table;
2233 u32 addr1, addr2, ihl;
2239 if (skb_rx_queue_recorded(skb)) {
2240 u16 index = skb_get_rx_queue(skb);
2241 if (unlikely(index >= dev->num_rx_queues)) {
2242 if (net_ratelimit()) {
2243 pr_warning("%s received packet on queue "
2244 "%u, but number of RX queues is %u\n",
2245 dev->name, index, dev->num_rx_queues);
2249 rxqueue = dev->_rx + index;
2253 if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
2257 goto got_hash; /* Skip hash computation on packet header */
2259 switch (skb->protocol) {
2260 case __constant_htons(ETH_P_IP):
2261 if (!pskb_may_pull(skb, sizeof(*ip)))
2264 ip = (struct iphdr *) skb->data;
2265 ip_proto = ip->protocol;
2266 addr1 = (__force u32) ip->saddr;
2267 addr2 = (__force u32) ip->daddr;
2270 case __constant_htons(ETH_P_IPV6):
2271 if (!pskb_may_pull(skb, sizeof(*ip6)))
2274 ip6 = (struct ipv6hdr *) skb->data;
2275 ip_proto = ip6->nexthdr;
2276 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2277 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2290 case IPPROTO_UDPLITE:
2291 if (pskb_may_pull(skb, (ihl * 4) + 4)) {
2292 ports.v32 = * (__force u32 *) (skb->data + (ihl * 4));
2293 if (ports.v16[1] < ports.v16[0])
2294 swap(ports.v16[0], ports.v16[1]);
2302 /* get a consistent hash (same value on both flow directions) */
2305 skb->rxhash = jhash_3words(addr1, addr2, ports.v32, 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;
2533 sd->output_queue_tailp = &sd->output_queue;
2537 struct Qdisc *q = head;
2538 spinlock_t *root_lock;
2540 head = head->next_sched;
2542 root_lock = qdisc_lock(q);
2543 if (spin_trylock(root_lock)) {
2544 smp_mb__before_clear_bit();
2545 clear_bit(__QDISC_STATE_SCHED,
2548 spin_unlock(root_lock);
2550 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2552 __netif_reschedule(q);
2554 smp_mb__before_clear_bit();
2555 clear_bit(__QDISC_STATE_SCHED,
2563 static inline int deliver_skb(struct sk_buff *skb,
2564 struct packet_type *pt_prev,
2565 struct net_device *orig_dev)
2567 atomic_inc(&skb->users);
2568 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2571 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2573 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
2574 /* This hook is defined here for ATM LANE */
2575 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2576 unsigned char *addr) __read_mostly;
2577 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2581 * If bridge module is loaded call bridging hook.
2582 * returns NULL if packet was consumed.
2584 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2585 struct sk_buff *skb) __read_mostly;
2586 EXPORT_SYMBOL_GPL(br_handle_frame_hook);
2588 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2589 struct packet_type **pt_prev, int *ret,
2590 struct net_device *orig_dev)
2592 struct net_bridge_port *port;
2594 if (skb->pkt_type == PACKET_LOOPBACK ||
2595 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2599 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2603 return br_handle_frame_hook(port, skb);
2606 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2609 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2610 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2611 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2613 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2614 struct packet_type **pt_prev,
2616 struct net_device *orig_dev)
2618 if (skb->dev->macvlan_port == NULL)
2622 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2625 return macvlan_handle_frame_hook(skb);
2628 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2631 #ifdef CONFIG_NET_CLS_ACT
2632 /* TODO: Maybe we should just force sch_ingress to be compiled in
2633 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2634 * a compare and 2 stores extra right now if we dont have it on
2635 * but have CONFIG_NET_CLS_ACT
2636 * NOTE: This doesnt stop any functionality; if you dont have
2637 * the ingress scheduler, you just cant add policies on ingress.
2640 static int ing_filter(struct sk_buff *skb)
2642 struct net_device *dev = skb->dev;
2643 u32 ttl = G_TC_RTTL(skb->tc_verd);
2644 struct netdev_queue *rxq;
2645 int result = TC_ACT_OK;
2648 if (MAX_RED_LOOP < ttl++) {
2650 "Redir loop detected Dropping packet (%d->%d)\n",
2651 skb->skb_iif, dev->ifindex);
2655 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2656 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2658 rxq = &dev->rx_queue;
2661 if (q != &noop_qdisc) {
2662 spin_lock(qdisc_lock(q));
2663 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2664 result = qdisc_enqueue_root(skb, q);
2665 spin_unlock(qdisc_lock(q));
2671 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2672 struct packet_type **pt_prev,
2673 int *ret, struct net_device *orig_dev)
2675 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2679 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2682 /* Huh? Why does turning on AF_PACKET affect this? */
2683 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2686 switch (ing_filter(skb)) {
2700 * netif_nit_deliver - deliver received packets to network taps
2703 * This function is used to deliver incoming packets to network
2704 * taps. It should be used when the normal netif_receive_skb path
2705 * is bypassed, for example because of VLAN acceleration.
2707 void netif_nit_deliver(struct sk_buff *skb)
2709 struct packet_type *ptype;
2711 if (list_empty(&ptype_all))
2714 skb_reset_network_header(skb);
2715 skb_reset_transport_header(skb);
2716 skb->mac_len = skb->network_header - skb->mac_header;
2719 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2720 if (!ptype->dev || ptype->dev == skb->dev)
2721 deliver_skb(skb, ptype, skb->dev);
2726 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2727 struct net_device *master)
2729 if (skb->pkt_type == PACKET_HOST) {
2730 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2732 memcpy(dest, master->dev_addr, ETH_ALEN);
2736 /* On bonding slaves other than the currently active slave, suppress
2737 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2738 * ARP on active-backup slaves with arp_validate enabled.
2740 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2742 struct net_device *dev = skb->dev;
2744 if (master->priv_flags & IFF_MASTER_ARPMON)
2745 dev->last_rx = jiffies;
2747 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
2748 /* Do address unmangle. The local destination address
2749 * will be always the one master has. Provides the right
2750 * functionality in a bridge.
2752 skb_bond_set_mac_by_master(skb, master);
2755 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2756 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2757 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2760 if (master->priv_flags & IFF_MASTER_ALB) {
2761 if (skb->pkt_type != PACKET_BROADCAST &&
2762 skb->pkt_type != PACKET_MULTICAST)
2765 if (master->priv_flags & IFF_MASTER_8023AD &&
2766 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2773 EXPORT_SYMBOL(__skb_bond_should_drop);
2775 static int __netif_receive_skb(struct sk_buff *skb)
2777 struct packet_type *ptype, *pt_prev;
2778 struct net_device *orig_dev;
2779 struct net_device *master;
2780 struct net_device *null_or_orig;
2781 struct net_device *null_or_bond;
2782 int ret = NET_RX_DROP;
2785 if (!skb->tstamp.tv64)
2788 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2789 return NET_RX_SUCCESS;
2791 /* if we've gotten here through NAPI, check netpoll */
2792 if (netpoll_receive_skb(skb))
2796 skb->skb_iif = skb->dev->ifindex;
2798 null_or_orig = NULL;
2799 orig_dev = skb->dev;
2800 master = ACCESS_ONCE(orig_dev->master);
2802 if (skb_bond_should_drop(skb, master))
2803 null_or_orig = orig_dev; /* deliver only exact match */
2808 __get_cpu_var(netdev_rx_stat).total++;
2810 skb_reset_network_header(skb);
2811 skb_reset_transport_header(skb);
2812 skb->mac_len = skb->network_header - skb->mac_header;
2818 #ifdef CONFIG_NET_CLS_ACT
2819 if (skb->tc_verd & TC_NCLS) {
2820 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2825 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2826 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2827 ptype->dev == orig_dev) {
2829 ret = deliver_skb(skb, pt_prev, orig_dev);
2834 #ifdef CONFIG_NET_CLS_ACT
2835 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2841 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2844 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2849 * Make sure frames received on VLAN interfaces stacked on
2850 * bonding interfaces still make their way to any base bonding
2851 * device that may have registered for a specific ptype. The
2852 * handler may have to adjust skb->dev and orig_dev.
2854 null_or_bond = NULL;
2855 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2856 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2857 null_or_bond = vlan_dev_real_dev(skb->dev);
2860 type = skb->protocol;
2861 list_for_each_entry_rcu(ptype,
2862 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2863 if (ptype->type == type && (ptype->dev == null_or_orig ||
2864 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2865 ptype->dev == null_or_bond)) {
2867 ret = deliver_skb(skb, pt_prev, orig_dev);
2873 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2876 /* Jamal, now you will not able to escape explaining
2877 * me how you were going to use this. :-)
2888 * netif_receive_skb - process receive buffer from network
2889 * @skb: buffer to process
2891 * netif_receive_skb() is the main receive data processing function.
2892 * It always succeeds. The buffer may be dropped during processing
2893 * for congestion control or by the protocol layers.
2895 * This function may only be called from softirq context and interrupts
2896 * should be enabled.
2898 * Return values (usually ignored):
2899 * NET_RX_SUCCESS: no congestion
2900 * NET_RX_DROP: packet was dropped
2902 int netif_receive_skb(struct sk_buff *skb)
2905 struct rps_dev_flow voidflow, *rflow = &voidflow;
2910 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2913 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2917 ret = __netif_receive_skb(skb);
2922 return __netif_receive_skb(skb);
2925 EXPORT_SYMBOL(netif_receive_skb);
2927 /* Network device is going away, flush any packets still pending
2928 * Called with irqs disabled.
2930 static void flush_backlog(void *arg)
2932 struct net_device *dev = arg;
2933 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2934 struct sk_buff *skb, *tmp;
2937 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp)
2938 if (skb->dev == dev) {
2939 __skb_unlink(skb, &sd->input_pkt_queue);
2941 input_queue_head_incr(sd);
2946 static int napi_gro_complete(struct sk_buff *skb)
2948 struct packet_type *ptype;
2949 __be16 type = skb->protocol;
2950 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2953 if (NAPI_GRO_CB(skb)->count == 1) {
2954 skb_shinfo(skb)->gso_size = 0;
2959 list_for_each_entry_rcu(ptype, head, list) {
2960 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2963 err = ptype->gro_complete(skb);
2969 WARN_ON(&ptype->list == head);
2971 return NET_RX_SUCCESS;
2975 return netif_receive_skb(skb);
2978 static void napi_gro_flush(struct napi_struct *napi)
2980 struct sk_buff *skb, *next;
2982 for (skb = napi->gro_list; skb; skb = next) {
2985 napi_gro_complete(skb);
2988 napi->gro_count = 0;
2989 napi->gro_list = NULL;
2992 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2994 struct sk_buff **pp = NULL;
2995 struct packet_type *ptype;
2996 __be16 type = skb->protocol;
2997 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3000 enum gro_result ret;
3002 if (!(skb->dev->features & NETIF_F_GRO))
3005 if (skb_is_gso(skb) || skb_has_frags(skb))
3009 list_for_each_entry_rcu(ptype, head, list) {
3010 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3013 skb_set_network_header(skb, skb_gro_offset(skb));
3014 mac_len = skb->network_header - skb->mac_header;
3015 skb->mac_len = mac_len;
3016 NAPI_GRO_CB(skb)->same_flow = 0;
3017 NAPI_GRO_CB(skb)->flush = 0;
3018 NAPI_GRO_CB(skb)->free = 0;
3020 pp = ptype->gro_receive(&napi->gro_list, skb);
3025 if (&ptype->list == head)
3028 same_flow = NAPI_GRO_CB(skb)->same_flow;
3029 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3032 struct sk_buff *nskb = *pp;
3036 napi_gro_complete(nskb);
3043 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3047 NAPI_GRO_CB(skb)->count = 1;
3048 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3049 skb->next = napi->gro_list;
3050 napi->gro_list = skb;
3054 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3055 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3057 BUG_ON(skb->end - skb->tail < grow);
3059 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3062 skb->data_len -= grow;
3064 skb_shinfo(skb)->frags[0].page_offset += grow;
3065 skb_shinfo(skb)->frags[0].size -= grow;
3067 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3068 put_page(skb_shinfo(skb)->frags[0].page);
3069 memmove(skb_shinfo(skb)->frags,
3070 skb_shinfo(skb)->frags + 1,
3071 --skb_shinfo(skb)->nr_frags);
3082 EXPORT_SYMBOL(dev_gro_receive);
3085 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3089 if (netpoll_rx_on(skb))
3092 for (p = napi->gro_list; p; p = p->next) {
3093 NAPI_GRO_CB(p)->same_flow =
3094 (p->dev == skb->dev) &&
3095 !compare_ether_header(skb_mac_header(p),
3096 skb_gro_mac_header(skb));
3097 NAPI_GRO_CB(p)->flush = 0;
3100 return dev_gro_receive(napi, skb);
3103 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3107 if (netif_receive_skb(skb))
3112 case GRO_MERGED_FREE:
3123 EXPORT_SYMBOL(napi_skb_finish);
3125 void skb_gro_reset_offset(struct sk_buff *skb)
3127 NAPI_GRO_CB(skb)->data_offset = 0;
3128 NAPI_GRO_CB(skb)->frag0 = NULL;
3129 NAPI_GRO_CB(skb)->frag0_len = 0;
3131 if (skb->mac_header == skb->tail &&
3132 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3133 NAPI_GRO_CB(skb)->frag0 =
3134 page_address(skb_shinfo(skb)->frags[0].page) +
3135 skb_shinfo(skb)->frags[0].page_offset;
3136 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3139 EXPORT_SYMBOL(skb_gro_reset_offset);
3141 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3143 skb_gro_reset_offset(skb);
3145 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3147 EXPORT_SYMBOL(napi_gro_receive);
3149 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3151 __skb_pull(skb, skb_headlen(skb));
3152 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3156 EXPORT_SYMBOL(napi_reuse_skb);
3158 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3160 struct sk_buff *skb = napi->skb;
3163 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3169 EXPORT_SYMBOL(napi_get_frags);
3171 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3177 skb->protocol = eth_type_trans(skb, skb->dev);
3179 if (ret == GRO_HELD)
3180 skb_gro_pull(skb, -ETH_HLEN);
3181 else if (netif_receive_skb(skb))
3186 case GRO_MERGED_FREE:
3187 napi_reuse_skb(napi, skb);
3196 EXPORT_SYMBOL(napi_frags_finish);
3198 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3200 struct sk_buff *skb = napi->skb;
3207 skb_reset_mac_header(skb);
3208 skb_gro_reset_offset(skb);
3210 off = skb_gro_offset(skb);
3211 hlen = off + sizeof(*eth);
3212 eth = skb_gro_header_fast(skb, off);
3213 if (skb_gro_header_hard(skb, hlen)) {
3214 eth = skb_gro_header_slow(skb, hlen, off);
3215 if (unlikely(!eth)) {
3216 napi_reuse_skb(napi, skb);
3222 skb_gro_pull(skb, sizeof(*eth));
3225 * This works because the only protocols we care about don't require
3226 * special handling. We'll fix it up properly at the end.
3228 skb->protocol = eth->h_proto;
3233 EXPORT_SYMBOL(napi_frags_skb);
3235 gro_result_t napi_gro_frags(struct napi_struct *napi)
3237 struct sk_buff *skb = napi_frags_skb(napi);
3242 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3244 EXPORT_SYMBOL(napi_gro_frags);
3247 * net_rps_action sends any pending IPI's for rps.
3248 * Note: called with local irq disabled, but exits with local irq enabled.
3250 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3253 struct softnet_data *remsd = sd->rps_ipi_list;
3256 sd->rps_ipi_list = NULL;
3260 /* Send pending IPI's to kick RPS processing on remote cpus. */
3262 struct softnet_data *next = remsd->rps_ipi_next;
3264 if (cpu_online(remsd->cpu))
3265 __smp_call_function_single(remsd->cpu,
3274 static int process_backlog(struct napi_struct *napi, int quota)
3277 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3280 /* Check if we have pending ipi, its better to send them now,
3281 * not waiting net_rx_action() end.
3283 if (sd->rps_ipi_list) {
3284 local_irq_disable();
3285 net_rps_action_and_irq_enable(sd);
3288 napi->weight = weight_p;
3290 struct sk_buff *skb;
3292 local_irq_disable();
3294 skb = __skb_dequeue(&sd->input_pkt_queue);
3296 __napi_complete(napi);
3301 input_queue_head_incr(sd);
3305 __netif_receive_skb(skb);
3306 } while (++work < quota);
3312 * __napi_schedule - schedule for receive
3313 * @n: entry to schedule
3315 * The entry's receive function will be scheduled to run
3317 void __napi_schedule(struct napi_struct *n)
3319 unsigned long flags;
3321 local_irq_save(flags);
3322 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
3323 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3324 local_irq_restore(flags);
3326 EXPORT_SYMBOL(__napi_schedule);
3328 void __napi_complete(struct napi_struct *n)
3330 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3331 BUG_ON(n->gro_list);
3333 list_del(&n->poll_list);
3334 smp_mb__before_clear_bit();
3335 clear_bit(NAPI_STATE_SCHED, &n->state);
3337 EXPORT_SYMBOL(__napi_complete);
3339 void napi_complete(struct napi_struct *n)
3341 unsigned long flags;
3344 * don't let napi dequeue from the cpu poll list
3345 * just in case its running on a different cpu
3347 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3351 local_irq_save(flags);
3353 local_irq_restore(flags);
3355 EXPORT_SYMBOL(napi_complete);
3357 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3358 int (*poll)(struct napi_struct *, int), int weight)
3360 INIT_LIST_HEAD(&napi->poll_list);
3361 napi->gro_count = 0;
3362 napi->gro_list = NULL;
3365 napi->weight = weight;
3366 list_add(&napi->dev_list, &dev->napi_list);
3368 #ifdef CONFIG_NETPOLL
3369 spin_lock_init(&napi->poll_lock);
3370 napi->poll_owner = -1;
3372 set_bit(NAPI_STATE_SCHED, &napi->state);
3374 EXPORT_SYMBOL(netif_napi_add);
3376 void netif_napi_del(struct napi_struct *napi)
3378 struct sk_buff *skb, *next;
3380 list_del_init(&napi->dev_list);
3381 napi_free_frags(napi);
3383 for (skb = napi->gro_list; skb; skb = next) {
3389 napi->gro_list = NULL;
3390 napi->gro_count = 0;
3392 EXPORT_SYMBOL(netif_napi_del);
3394 static void net_rx_action(struct softirq_action *h)
3396 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3397 unsigned long time_limit = jiffies + 2;
3398 int budget = netdev_budget;
3401 local_irq_disable();
3403 while (!list_empty(&sd->poll_list)) {
3404 struct napi_struct *n;
3407 /* If softirq window is exhuasted then punt.
3408 * Allow this to run for 2 jiffies since which will allow
3409 * an average latency of 1.5/HZ.
3411 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3416 /* Even though interrupts have been re-enabled, this
3417 * access is safe because interrupts can only add new
3418 * entries to the tail of this list, and only ->poll()
3419 * calls can remove this head entry from the list.
3421 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3423 have = netpoll_poll_lock(n);
3427 /* This NAPI_STATE_SCHED test is for avoiding a race
3428 * with netpoll's poll_napi(). Only the entity which
3429 * obtains the lock and sees NAPI_STATE_SCHED set will
3430 * actually make the ->poll() call. Therefore we avoid
3431 * accidently calling ->poll() when NAPI is not scheduled.
3434 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3435 work = n->poll(n, weight);
3439 WARN_ON_ONCE(work > weight);
3443 local_irq_disable();
3445 /* Drivers must not modify the NAPI state if they
3446 * consume the entire weight. In such cases this code
3447 * still "owns" the NAPI instance and therefore can
3448 * move the instance around on the list at-will.
3450 if (unlikely(work == weight)) {
3451 if (unlikely(napi_disable_pending(n))) {
3454 local_irq_disable();
3456 list_move_tail(&n->poll_list, &sd->poll_list);
3459 netpoll_poll_unlock(have);
3462 net_rps_action_and_irq_enable(sd);
3464 #ifdef CONFIG_NET_DMA
3466 * There may not be any more sk_buffs coming right now, so push
3467 * any pending DMA copies to hardware
3469 dma_issue_pending_all();
3475 __get_cpu_var(netdev_rx_stat).time_squeeze++;
3476 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3480 static gifconf_func_t *gifconf_list[NPROTO];
3483 * register_gifconf - register a SIOCGIF handler
3484 * @family: Address family
3485 * @gifconf: Function handler
3487 * Register protocol dependent address dumping routines. The handler
3488 * that is passed must not be freed or reused until it has been replaced
3489 * by another handler.
3491 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3493 if (family >= NPROTO)
3495 gifconf_list[family] = gifconf;
3498 EXPORT_SYMBOL(register_gifconf);
3502 * Map an interface index to its name (SIOCGIFNAME)
3506 * We need this ioctl for efficient implementation of the
3507 * if_indextoname() function required by the IPv6 API. Without
3508 * it, we would have to search all the interfaces to find a
3512 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3514 struct net_device *dev;
3518 * Fetch the caller's info block.
3521 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3525 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3531 strcpy(ifr.ifr_name, dev->name);
3534 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3540 * Perform a SIOCGIFCONF call. This structure will change
3541 * size eventually, and there is nothing I can do about it.
3542 * Thus we will need a 'compatibility mode'.
3545 static int dev_ifconf(struct net *net, char __user *arg)
3548 struct net_device *dev;
3555 * Fetch the caller's info block.
3558 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3565 * Loop over the interfaces, and write an info block for each.
3569 for_each_netdev(net, dev) {
3570 for (i = 0; i < NPROTO; i++) {
3571 if (gifconf_list[i]) {
3574 done = gifconf_list[i](dev, NULL, 0);
3576 done = gifconf_list[i](dev, pos + total,
3586 * All done. Write the updated control block back to the caller.
3588 ifc.ifc_len = total;
3591 * Both BSD and Solaris return 0 here, so we do too.
3593 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3596 #ifdef CONFIG_PROC_FS
3598 * This is invoked by the /proc filesystem handler to display a device
3601 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3604 struct net *net = seq_file_net(seq);
3606 struct net_device *dev;
3610 return SEQ_START_TOKEN;
3613 for_each_netdev_rcu(net, dev)
3620 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3622 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3623 first_net_device(seq_file_net(seq)) :
3624 next_net_device((struct net_device *)v);
3627 return rcu_dereference(dev);
3630 void dev_seq_stop(struct seq_file *seq, void *v)
3636 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3638 const struct net_device_stats *stats = dev_get_stats(dev);
3640 seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3641 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3642 dev->name, stats->rx_bytes, stats->rx_packets,
3644 stats->rx_dropped + stats->rx_missed_errors,
3645 stats->rx_fifo_errors,
3646 stats->rx_length_errors + stats->rx_over_errors +
3647 stats->rx_crc_errors + stats->rx_frame_errors,
3648 stats->rx_compressed, stats->multicast,
3649 stats->tx_bytes, stats->tx_packets,
3650 stats->tx_errors, stats->tx_dropped,
3651 stats->tx_fifo_errors, stats->collisions,
3652 stats->tx_carrier_errors +
3653 stats->tx_aborted_errors +
3654 stats->tx_window_errors +
3655 stats->tx_heartbeat_errors,
3656 stats->tx_compressed);
3660 * Called from the PROCfs module. This now uses the new arbitrary sized
3661 * /proc/net interface to create /proc/net/dev
3663 static int dev_seq_show(struct seq_file *seq, void *v)
3665 if (v == SEQ_START_TOKEN)
3666 seq_puts(seq, "Inter-| Receive "
3668 " face |bytes packets errs drop fifo frame "
3669 "compressed multicast|bytes packets errs "
3670 "drop fifo colls carrier compressed\n");
3672 dev_seq_printf_stats(seq, v);
3676 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
3678 struct netif_rx_stats *rc = NULL;
3680 while (*pos < nr_cpu_ids)
3681 if (cpu_online(*pos)) {
3682 rc = &per_cpu(netdev_rx_stat, *pos);
3689 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3691 return softnet_get_online(pos);
3694 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3697 return softnet_get_online(pos);
3700 static void softnet_seq_stop(struct seq_file *seq, void *v)
3704 static int softnet_seq_show(struct seq_file *seq, void *v)
3706 struct netif_rx_stats *s = v;
3708 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3709 s->total, s->dropped, s->time_squeeze, 0,
3710 0, 0, 0, 0, /* was fastroute */
3711 s->cpu_collision, s->received_rps);
3715 static const struct seq_operations dev_seq_ops = {
3716 .start = dev_seq_start,
3717 .next = dev_seq_next,
3718 .stop = dev_seq_stop,
3719 .show = dev_seq_show,
3722 static int dev_seq_open(struct inode *inode, struct file *file)
3724 return seq_open_net(inode, file, &dev_seq_ops,
3725 sizeof(struct seq_net_private));
3728 static const struct file_operations dev_seq_fops = {
3729 .owner = THIS_MODULE,
3730 .open = dev_seq_open,
3732 .llseek = seq_lseek,
3733 .release = seq_release_net,
3736 static const struct seq_operations softnet_seq_ops = {
3737 .start = softnet_seq_start,
3738 .next = softnet_seq_next,
3739 .stop = softnet_seq_stop,
3740 .show = softnet_seq_show,
3743 static int softnet_seq_open(struct inode *inode, struct file *file)
3745 return seq_open(file, &softnet_seq_ops);
3748 static const struct file_operations softnet_seq_fops = {
3749 .owner = THIS_MODULE,
3750 .open = softnet_seq_open,
3752 .llseek = seq_lseek,
3753 .release = seq_release,
3756 static void *ptype_get_idx(loff_t pos)
3758 struct packet_type *pt = NULL;
3762 list_for_each_entry_rcu(pt, &ptype_all, list) {
3768 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3769 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3778 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3782 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3785 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3787 struct packet_type *pt;
3788 struct list_head *nxt;
3792 if (v == SEQ_START_TOKEN)
3793 return ptype_get_idx(0);
3796 nxt = pt->list.next;
3797 if (pt->type == htons(ETH_P_ALL)) {
3798 if (nxt != &ptype_all)
3801 nxt = ptype_base[0].next;
3803 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3805 while (nxt == &ptype_base[hash]) {
3806 if (++hash >= PTYPE_HASH_SIZE)
3808 nxt = ptype_base[hash].next;
3811 return list_entry(nxt, struct packet_type, list);
3814 static void ptype_seq_stop(struct seq_file *seq, void *v)
3820 static int ptype_seq_show(struct seq_file *seq, void *v)
3822 struct packet_type *pt = v;
3824 if (v == SEQ_START_TOKEN)
3825 seq_puts(seq, "Type Device Function\n");
3826 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3827 if (pt->type == htons(ETH_P_ALL))
3828 seq_puts(seq, "ALL ");
3830 seq_printf(seq, "%04x", ntohs(pt->type));
3832 seq_printf(seq, " %-8s %pF\n",
3833 pt->dev ? pt->dev->name : "", pt->func);
3839 static const struct seq_operations ptype_seq_ops = {
3840 .start = ptype_seq_start,
3841 .next = ptype_seq_next,
3842 .stop = ptype_seq_stop,
3843 .show = ptype_seq_show,
3846 static int ptype_seq_open(struct inode *inode, struct file *file)
3848 return seq_open_net(inode, file, &ptype_seq_ops,
3849 sizeof(struct seq_net_private));
3852 static const struct file_operations ptype_seq_fops = {
3853 .owner = THIS_MODULE,
3854 .open = ptype_seq_open,
3856 .llseek = seq_lseek,
3857 .release = seq_release_net,
3861 static int __net_init dev_proc_net_init(struct net *net)
3865 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3867 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3869 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3872 if (wext_proc_init(net))
3878 proc_net_remove(net, "ptype");
3880 proc_net_remove(net, "softnet_stat");
3882 proc_net_remove(net, "dev");
3886 static void __net_exit dev_proc_net_exit(struct net *net)
3888 wext_proc_exit(net);
3890 proc_net_remove(net, "ptype");
3891 proc_net_remove(net, "softnet_stat");
3892 proc_net_remove(net, "dev");
3895 static struct pernet_operations __net_initdata dev_proc_ops = {
3896 .init = dev_proc_net_init,
3897 .exit = dev_proc_net_exit,
3900 static int __init dev_proc_init(void)
3902 return register_pernet_subsys(&dev_proc_ops);
3905 #define dev_proc_init() 0
3906 #endif /* CONFIG_PROC_FS */
3910 * netdev_set_master - set up master/slave pair
3911 * @slave: slave device
3912 * @master: new master device
3914 * Changes the master device of the slave. Pass %NULL to break the
3915 * bonding. The caller must hold the RTNL semaphore. On a failure
3916 * a negative errno code is returned. On success the reference counts
3917 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3918 * function returns zero.
3920 int netdev_set_master(struct net_device *slave, struct net_device *master)
3922 struct net_device *old = slave->master;
3932 slave->master = master;
3939 slave->flags |= IFF_SLAVE;
3941 slave->flags &= ~IFF_SLAVE;
3943 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3946 EXPORT_SYMBOL(netdev_set_master);
3948 static void dev_change_rx_flags(struct net_device *dev, int flags)
3950 const struct net_device_ops *ops = dev->netdev_ops;
3952 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3953 ops->ndo_change_rx_flags(dev, flags);
3956 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3958 unsigned short old_flags = dev->flags;
3964 dev->flags |= IFF_PROMISC;
3965 dev->promiscuity += inc;
3966 if (dev->promiscuity == 0) {
3969 * If inc causes overflow, untouch promisc and return error.
3972 dev->flags &= ~IFF_PROMISC;
3974 dev->promiscuity -= inc;
3975 printk(KERN_WARNING "%s: promiscuity touches roof, "
3976 "set promiscuity failed, promiscuity feature "
3977 "of device might be broken.\n", dev->name);
3981 if (dev->flags != old_flags) {
3982 printk(KERN_INFO "device %s %s promiscuous mode\n",
3983 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3985 if (audit_enabled) {
3986 current_uid_gid(&uid, &gid);
3987 audit_log(current->audit_context, GFP_ATOMIC,
3988 AUDIT_ANOM_PROMISCUOUS,
3989 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3990 dev->name, (dev->flags & IFF_PROMISC),
3991 (old_flags & IFF_PROMISC),
3992 audit_get_loginuid(current),
3994 audit_get_sessionid(current));
3997 dev_change_rx_flags(dev, IFF_PROMISC);
4003 * dev_set_promiscuity - update promiscuity count on a device
4007 * Add or remove promiscuity from a device. While the count in the device
4008 * remains above zero the interface remains promiscuous. Once it hits zero
4009 * the device reverts back to normal filtering operation. A negative inc
4010 * value is used to drop promiscuity on the device.
4011 * Return 0 if successful or a negative errno code on error.
4013 int dev_set_promiscuity(struct net_device *dev, int inc)
4015 unsigned short old_flags = dev->flags;
4018 err = __dev_set_promiscuity(dev, inc);
4021 if (dev->flags != old_flags)
4022 dev_set_rx_mode(dev);
4025 EXPORT_SYMBOL(dev_set_promiscuity);
4028 * dev_set_allmulti - update allmulti count on a device
4032 * Add or remove reception of all multicast frames to a device. While the
4033 * count in the device remains above zero the interface remains listening
4034 * to all interfaces. Once it hits zero the device reverts back to normal
4035 * filtering operation. A negative @inc value is used to drop the counter
4036 * when releasing a resource needing all multicasts.
4037 * Return 0 if successful or a negative errno code on error.
4040 int dev_set_allmulti(struct net_device *dev, int inc)
4042 unsigned short old_flags = dev->flags;
4046 dev->flags |= IFF_ALLMULTI;
4047 dev->allmulti += inc;
4048 if (dev->allmulti == 0) {
4051 * If inc causes overflow, untouch allmulti and return error.
4054 dev->flags &= ~IFF_ALLMULTI;
4056 dev->allmulti -= inc;
4057 printk(KERN_WARNING "%s: allmulti touches roof, "
4058 "set allmulti failed, allmulti feature of "
4059 "device might be broken.\n", dev->name);
4063 if (dev->flags ^ old_flags) {
4064 dev_change_rx_flags(dev, IFF_ALLMULTI);
4065 dev_set_rx_mode(dev);
4069 EXPORT_SYMBOL(dev_set_allmulti);
4072 * Upload unicast and multicast address lists to device and
4073 * configure RX filtering. When the device doesn't support unicast
4074 * filtering it is put in promiscuous mode while unicast addresses
4077 void __dev_set_rx_mode(struct net_device *dev)
4079 const struct net_device_ops *ops = dev->netdev_ops;
4081 /* dev_open will call this function so the list will stay sane. */
4082 if (!(dev->flags&IFF_UP))
4085 if (!netif_device_present(dev))
4088 if (ops->ndo_set_rx_mode)
4089 ops->ndo_set_rx_mode(dev);
4091 /* Unicast addresses changes may only happen under the rtnl,
4092 * therefore calling __dev_set_promiscuity here is safe.
4094 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4095 __dev_set_promiscuity(dev, 1);
4096 dev->uc_promisc = 1;
4097 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4098 __dev_set_promiscuity(dev, -1);
4099 dev->uc_promisc = 0;
4102 if (ops->ndo_set_multicast_list)
4103 ops->ndo_set_multicast_list(dev);
4107 void dev_set_rx_mode(struct net_device *dev)
4109 netif_addr_lock_bh(dev);
4110 __dev_set_rx_mode(dev);
4111 netif_addr_unlock_bh(dev);
4115 * dev_get_flags - get flags reported to userspace
4118 * Get the combination of flag bits exported through APIs to userspace.
4120 unsigned dev_get_flags(const struct net_device *dev)
4124 flags = (dev->flags & ~(IFF_PROMISC |
4129 (dev->gflags & (IFF_PROMISC |
4132 if (netif_running(dev)) {
4133 if (netif_oper_up(dev))
4134 flags |= IFF_RUNNING;
4135 if (netif_carrier_ok(dev))
4136 flags |= IFF_LOWER_UP;
4137 if (netif_dormant(dev))
4138 flags |= IFF_DORMANT;
4143 EXPORT_SYMBOL(dev_get_flags);
4145 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4147 int old_flags = dev->flags;
4153 * Set the flags on our device.
4156 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4157 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4159 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4163 * Load in the correct multicast list now the flags have changed.
4166 if ((old_flags ^ flags) & IFF_MULTICAST)
4167 dev_change_rx_flags(dev, IFF_MULTICAST);
4169 dev_set_rx_mode(dev);
4172 * Have we downed the interface. We handle IFF_UP ourselves
4173 * according to user attempts to set it, rather than blindly
4178 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4179 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4182 dev_set_rx_mode(dev);
4185 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4186 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4188 dev->gflags ^= IFF_PROMISC;
4189 dev_set_promiscuity(dev, inc);
4192 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4193 is important. Some (broken) drivers set IFF_PROMISC, when
4194 IFF_ALLMULTI is requested not asking us and not reporting.
4196 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4197 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4199 dev->gflags ^= IFF_ALLMULTI;
4200 dev_set_allmulti(dev, inc);
4206 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4208 unsigned int changes = dev->flags ^ old_flags;
4210 if (changes & IFF_UP) {
4211 if (dev->flags & IFF_UP)
4212 call_netdevice_notifiers(NETDEV_UP, dev);
4214 call_netdevice_notifiers(NETDEV_DOWN, dev);
4217 if (dev->flags & IFF_UP &&
4218 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4219 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4223 * dev_change_flags - change device settings
4225 * @flags: device state flags
4227 * Change settings on device based state flags. The flags are
4228 * in the userspace exported format.
4230 int dev_change_flags(struct net_device *dev, unsigned flags)
4233 int old_flags = dev->flags;
4235 ret = __dev_change_flags(dev, flags);
4239 changes = old_flags ^ dev->flags;
4241 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4243 __dev_notify_flags(dev, old_flags);
4246 EXPORT_SYMBOL(dev_change_flags);
4249 * dev_set_mtu - Change maximum transfer unit
4251 * @new_mtu: new transfer unit
4253 * Change the maximum transfer size of the network device.
4255 int dev_set_mtu(struct net_device *dev, int new_mtu)
4257 const struct net_device_ops *ops = dev->netdev_ops;
4260 if (new_mtu == dev->mtu)
4263 /* MTU must be positive. */
4267 if (!netif_device_present(dev))
4271 if (ops->ndo_change_mtu)
4272 err = ops->ndo_change_mtu(dev, new_mtu);
4276 if (!err && dev->flags & IFF_UP)
4277 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4280 EXPORT_SYMBOL(dev_set_mtu);
4283 * dev_set_mac_address - Change Media Access Control Address
4287 * Change the hardware (MAC) address of the device
4289 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4291 const struct net_device_ops *ops = dev->netdev_ops;
4294 if (!ops->ndo_set_mac_address)
4296 if (sa->sa_family != dev->type)
4298 if (!netif_device_present(dev))
4300 err = ops->ndo_set_mac_address(dev, sa);
4302 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4305 EXPORT_SYMBOL(dev_set_mac_address);
4308 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4310 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4313 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4319 case SIOCGIFFLAGS: /* Get interface flags */
4320 ifr->ifr_flags = (short) dev_get_flags(dev);
4323 case SIOCGIFMETRIC: /* Get the metric on the interface
4324 (currently unused) */
4325 ifr->ifr_metric = 0;
4328 case SIOCGIFMTU: /* Get the MTU of a device */
4329 ifr->ifr_mtu = dev->mtu;
4334 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4336 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4337 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4338 ifr->ifr_hwaddr.sa_family = dev->type;
4346 ifr->ifr_map.mem_start = dev->mem_start;
4347 ifr->ifr_map.mem_end = dev->mem_end;
4348 ifr->ifr_map.base_addr = dev->base_addr;
4349 ifr->ifr_map.irq = dev->irq;
4350 ifr->ifr_map.dma = dev->dma;
4351 ifr->ifr_map.port = dev->if_port;
4355 ifr->ifr_ifindex = dev->ifindex;
4359 ifr->ifr_qlen = dev->tx_queue_len;
4363 /* dev_ioctl() should ensure this case
4375 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4377 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4380 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4381 const struct net_device_ops *ops;
4386 ops = dev->netdev_ops;
4389 case SIOCSIFFLAGS: /* Set interface flags */
4390 return dev_change_flags(dev, ifr->ifr_flags);
4392 case SIOCSIFMETRIC: /* Set the metric on the interface
4393 (currently unused) */
4396 case SIOCSIFMTU: /* Set the MTU of a device */
4397 return dev_set_mtu(dev, ifr->ifr_mtu);
4400 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4402 case SIOCSIFHWBROADCAST:
4403 if (ifr->ifr_hwaddr.sa_family != dev->type)
4405 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4406 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4407 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4411 if (ops->ndo_set_config) {
4412 if (!netif_device_present(dev))
4414 return ops->ndo_set_config(dev, &ifr->ifr_map);
4419 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4420 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4422 if (!netif_device_present(dev))
4424 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4427 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4428 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4430 if (!netif_device_present(dev))
4432 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4435 if (ifr->ifr_qlen < 0)
4437 dev->tx_queue_len = ifr->ifr_qlen;
4441 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4442 return dev_change_name(dev, ifr->ifr_newname);
4445 * Unknown or private ioctl
4448 if ((cmd >= SIOCDEVPRIVATE &&
4449 cmd <= SIOCDEVPRIVATE + 15) ||
4450 cmd == SIOCBONDENSLAVE ||
4451 cmd == SIOCBONDRELEASE ||
4452 cmd == SIOCBONDSETHWADDR ||
4453 cmd == SIOCBONDSLAVEINFOQUERY ||
4454 cmd == SIOCBONDINFOQUERY ||
4455 cmd == SIOCBONDCHANGEACTIVE ||
4456 cmd == SIOCGMIIPHY ||
4457 cmd == SIOCGMIIREG ||
4458 cmd == SIOCSMIIREG ||
4459 cmd == SIOCBRADDIF ||
4460 cmd == SIOCBRDELIF ||
4461 cmd == SIOCSHWTSTAMP ||
4462 cmd == SIOCWANDEV) {
4464 if (ops->ndo_do_ioctl) {
4465 if (netif_device_present(dev))
4466 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4478 * This function handles all "interface"-type I/O control requests. The actual
4479 * 'doing' part of this is dev_ifsioc above.
4483 * dev_ioctl - network device ioctl
4484 * @net: the applicable net namespace
4485 * @cmd: command to issue
4486 * @arg: pointer to a struct ifreq in user space
4488 * Issue ioctl functions to devices. This is normally called by the
4489 * user space syscall interfaces but can sometimes be useful for
4490 * other purposes. The return value is the return from the syscall if
4491 * positive or a negative errno code on error.
4494 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4500 /* One special case: SIOCGIFCONF takes ifconf argument
4501 and requires shared lock, because it sleeps writing
4505 if (cmd == SIOCGIFCONF) {
4507 ret = dev_ifconf(net, (char __user *) arg);
4511 if (cmd == SIOCGIFNAME)
4512 return dev_ifname(net, (struct ifreq __user *)arg);
4514 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4517 ifr.ifr_name[IFNAMSIZ-1] = 0;
4519 colon = strchr(ifr.ifr_name, ':');
4524 * See which interface the caller is talking about.
4529 * These ioctl calls:
4530 * - can be done by all.
4531 * - atomic and do not require locking.
4542 dev_load(net, ifr.ifr_name);
4544 ret = dev_ifsioc_locked(net, &ifr, cmd);
4549 if (copy_to_user(arg, &ifr,
4550 sizeof(struct ifreq)))
4556 dev_load(net, ifr.ifr_name);
4558 ret = dev_ethtool(net, &ifr);
4563 if (copy_to_user(arg, &ifr,
4564 sizeof(struct ifreq)))
4570 * These ioctl calls:
4571 * - require superuser power.
4572 * - require strict serialization.
4578 if (!capable(CAP_NET_ADMIN))
4580 dev_load(net, ifr.ifr_name);
4582 ret = dev_ifsioc(net, &ifr, cmd);
4587 if (copy_to_user(arg, &ifr,
4588 sizeof(struct ifreq)))
4594 * These ioctl calls:
4595 * - require superuser power.
4596 * - require strict serialization.
4597 * - do not return a value
4607 case SIOCSIFHWBROADCAST:
4610 case SIOCBONDENSLAVE:
4611 case SIOCBONDRELEASE:
4612 case SIOCBONDSETHWADDR:
4613 case SIOCBONDCHANGEACTIVE:
4617 if (!capable(CAP_NET_ADMIN))
4620 case SIOCBONDSLAVEINFOQUERY:
4621 case SIOCBONDINFOQUERY:
4622 dev_load(net, ifr.ifr_name);
4624 ret = dev_ifsioc(net, &ifr, cmd);
4629 /* Get the per device memory space. We can add this but
4630 * currently do not support it */
4632 /* Set the per device memory buffer space.
4633 * Not applicable in our case */
4638 * Unknown or private ioctl.
4641 if (cmd == SIOCWANDEV ||
4642 (cmd >= SIOCDEVPRIVATE &&
4643 cmd <= SIOCDEVPRIVATE + 15)) {
4644 dev_load(net, ifr.ifr_name);
4646 ret = dev_ifsioc(net, &ifr, cmd);
4648 if (!ret && copy_to_user(arg, &ifr,
4649 sizeof(struct ifreq)))
4653 /* Take care of Wireless Extensions */
4654 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4655 return wext_handle_ioctl(net, &ifr, cmd, arg);
4662 * dev_new_index - allocate an ifindex
4663 * @net: the applicable net namespace
4665 * Returns a suitable unique value for a new device interface
4666 * number. The caller must hold the rtnl semaphore or the
4667 * dev_base_lock to be sure it remains unique.
4669 static int dev_new_index(struct net *net)
4675 if (!__dev_get_by_index(net, ifindex))
4680 /* Delayed registration/unregisteration */
4681 static LIST_HEAD(net_todo_list);
4683 static void net_set_todo(struct net_device *dev)
4685 list_add_tail(&dev->todo_list, &net_todo_list);
4688 static void rollback_registered_many(struct list_head *head)
4690 struct net_device *dev, *tmp;
4692 BUG_ON(dev_boot_phase);
4695 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4696 /* Some devices call without registering
4697 * for initialization unwind. Remove those
4698 * devices and proceed with the remaining.
4700 if (dev->reg_state == NETREG_UNINITIALIZED) {
4701 pr_debug("unregister_netdevice: device %s/%p never "
4702 "was registered\n", dev->name, dev);
4705 list_del(&dev->unreg_list);
4709 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4711 /* If device is running, close it first. */
4714 /* And unlink it from device chain. */
4715 unlist_netdevice(dev);
4717 dev->reg_state = NETREG_UNREGISTERING;
4722 list_for_each_entry(dev, head, unreg_list) {
4723 /* Shutdown queueing discipline. */
4727 /* Notify protocols, that we are about to destroy
4728 this device. They should clean all the things.
4730 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4732 if (!dev->rtnl_link_ops ||
4733 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4734 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4737 * Flush the unicast and multicast chains
4742 if (dev->netdev_ops->ndo_uninit)
4743 dev->netdev_ops->ndo_uninit(dev);
4745 /* Notifier chain MUST detach us from master device. */
4746 WARN_ON(dev->master);
4748 /* Remove entries from kobject tree */
4749 netdev_unregister_kobject(dev);
4752 /* Process any work delayed until the end of the batch */
4753 dev = list_first_entry(head, struct net_device, unreg_list);
4754 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4758 list_for_each_entry(dev, head, unreg_list)
4762 static void rollback_registered(struct net_device *dev)
4766 list_add(&dev->unreg_list, &single);
4767 rollback_registered_many(&single);
4770 static void __netdev_init_queue_locks_one(struct net_device *dev,
4771 struct netdev_queue *dev_queue,
4774 spin_lock_init(&dev_queue->_xmit_lock);
4775 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4776 dev_queue->xmit_lock_owner = -1;
4779 static void netdev_init_queue_locks(struct net_device *dev)
4781 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4782 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4785 unsigned long netdev_fix_features(unsigned long features, const char *name)
4787 /* Fix illegal SG+CSUM combinations. */
4788 if ((features & NETIF_F_SG) &&
4789 !(features & NETIF_F_ALL_CSUM)) {
4791 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4792 "checksum feature.\n", name);
4793 features &= ~NETIF_F_SG;
4796 /* TSO requires that SG is present as well. */
4797 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4799 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4800 "SG feature.\n", name);
4801 features &= ~NETIF_F_TSO;
4804 if (features & NETIF_F_UFO) {
4805 if (!(features & NETIF_F_GEN_CSUM)) {
4807 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4808 "since no NETIF_F_HW_CSUM feature.\n",
4810 features &= ~NETIF_F_UFO;
4813 if (!(features & NETIF_F_SG)) {
4815 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4816 "since no NETIF_F_SG feature.\n", name);
4817 features &= ~NETIF_F_UFO;
4823 EXPORT_SYMBOL(netdev_fix_features);
4826 * netif_stacked_transfer_operstate - transfer operstate
4827 * @rootdev: the root or lower level device to transfer state from
4828 * @dev: the device to transfer operstate to
4830 * Transfer operational state from root to device. This is normally
4831 * called when a stacking relationship exists between the root
4832 * device and the device(a leaf device).
4834 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4835 struct net_device *dev)
4837 if (rootdev->operstate == IF_OPER_DORMANT)
4838 netif_dormant_on(dev);
4840 netif_dormant_off(dev);
4842 if (netif_carrier_ok(rootdev)) {
4843 if (!netif_carrier_ok(dev))
4844 netif_carrier_on(dev);
4846 if (netif_carrier_ok(dev))
4847 netif_carrier_off(dev);
4850 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4853 * register_netdevice - register a network device
4854 * @dev: device to register
4856 * Take a completed network device structure and add it to the kernel
4857 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4858 * chain. 0 is returned on success. A negative errno code is returned
4859 * on a failure to set up the device, or if the name is a duplicate.
4861 * Callers must hold the rtnl semaphore. You may want
4862 * register_netdev() instead of this.
4865 * The locking appears insufficient to guarantee two parallel registers
4866 * will not get the same name.
4869 int register_netdevice(struct net_device *dev)
4872 struct net *net = dev_net(dev);
4874 BUG_ON(dev_boot_phase);
4879 /* When net_device's are persistent, this will be fatal. */
4880 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4883 spin_lock_init(&dev->addr_list_lock);
4884 netdev_set_addr_lockdep_class(dev);
4885 netdev_init_queue_locks(dev);
4890 if (!dev->num_rx_queues) {
4892 * Allocate a single RX queue if driver never called
4896 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
4902 dev->_rx->first = dev->_rx;
4903 atomic_set(&dev->_rx->count, 1);
4904 dev->num_rx_queues = 1;
4907 /* Init, if this function is available */
4908 if (dev->netdev_ops->ndo_init) {
4909 ret = dev->netdev_ops->ndo_init(dev);
4917 ret = dev_get_valid_name(net, dev->name, dev->name, 0);
4921 dev->ifindex = dev_new_index(net);
4922 if (dev->iflink == -1)
4923 dev->iflink = dev->ifindex;
4925 /* Fix illegal checksum combinations */
4926 if ((dev->features & NETIF_F_HW_CSUM) &&
4927 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4928 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4930 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4933 if ((dev->features & NETIF_F_NO_CSUM) &&
4934 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4935 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4937 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4940 dev->features = netdev_fix_features(dev->features, dev->name);
4942 /* Enable software GSO if SG is supported. */
4943 if (dev->features & NETIF_F_SG)
4944 dev->features |= NETIF_F_GSO;
4946 netdev_initialize_kobject(dev);
4948 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
4949 ret = notifier_to_errno(ret);
4953 ret = netdev_register_kobject(dev);
4956 dev->reg_state = NETREG_REGISTERED;
4959 * Default initial state at registry is that the
4960 * device is present.
4963 set_bit(__LINK_STATE_PRESENT, &dev->state);
4965 dev_init_scheduler(dev);
4967 list_netdevice(dev);
4969 /* Notify protocols, that a new device appeared. */
4970 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4971 ret = notifier_to_errno(ret);
4973 rollback_registered(dev);
4974 dev->reg_state = NETREG_UNREGISTERED;
4977 * Prevent userspace races by waiting until the network
4978 * device is fully setup before sending notifications.
4980 if (!dev->rtnl_link_ops ||
4981 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4982 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
4988 if (dev->netdev_ops->ndo_uninit)
4989 dev->netdev_ops->ndo_uninit(dev);
4992 EXPORT_SYMBOL(register_netdevice);
4995 * init_dummy_netdev - init a dummy network device for NAPI
4996 * @dev: device to init
4998 * This takes a network device structure and initialize the minimum
4999 * amount of fields so it can be used to schedule NAPI polls without
5000 * registering a full blown interface. This is to be used by drivers
5001 * that need to tie several hardware interfaces to a single NAPI
5002 * poll scheduler due to HW limitations.
5004 int init_dummy_netdev(struct net_device *dev)
5006 /* Clear everything. Note we don't initialize spinlocks
5007 * are they aren't supposed to be taken by any of the
5008 * NAPI code and this dummy netdev is supposed to be
5009 * only ever used for NAPI polls
5011 memset(dev, 0, sizeof(struct net_device));
5013 /* make sure we BUG if trying to hit standard
5014 * register/unregister code path
5016 dev->reg_state = NETREG_DUMMY;
5018 /* initialize the ref count */
5019 atomic_set(&dev->refcnt, 1);
5021 /* NAPI wants this */
5022 INIT_LIST_HEAD(&dev->napi_list);
5024 /* a dummy interface is started by default */
5025 set_bit(__LINK_STATE_PRESENT, &dev->state);
5026 set_bit(__LINK_STATE_START, &dev->state);
5030 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5034 * register_netdev - register a network device
5035 * @dev: device to register
5037 * Take a completed network device structure and add it to the kernel
5038 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5039 * chain. 0 is returned on success. A negative errno code is returned
5040 * on a failure to set up the device, or if the name is a duplicate.
5042 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5043 * and expands the device name if you passed a format string to
5046 int register_netdev(struct net_device *dev)
5053 * If the name is a format string the caller wants us to do a
5056 if (strchr(dev->name, '%')) {
5057 err = dev_alloc_name(dev, dev->name);
5062 err = register_netdevice(dev);
5067 EXPORT_SYMBOL(register_netdev);
5070 * netdev_wait_allrefs - wait until all references are gone.
5072 * This is called when unregistering network devices.
5074 * Any protocol or device that holds a reference should register
5075 * for netdevice notification, and cleanup and put back the
5076 * reference if they receive an UNREGISTER event.
5077 * We can get stuck here if buggy protocols don't correctly
5080 static void netdev_wait_allrefs(struct net_device *dev)
5082 unsigned long rebroadcast_time, warning_time;
5084 linkwatch_forget_dev(dev);
5086 rebroadcast_time = warning_time = jiffies;
5087 while (atomic_read(&dev->refcnt) != 0) {
5088 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5091 /* Rebroadcast unregister notification */
5092 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5093 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5094 * should have already handle it the first time */
5096 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5098 /* We must not have linkwatch events
5099 * pending on unregister. If this
5100 * happens, we simply run the queue
5101 * unscheduled, resulting in a noop
5104 linkwatch_run_queue();
5109 rebroadcast_time = jiffies;
5114 if (time_after(jiffies, warning_time + 10 * HZ)) {
5115 printk(KERN_EMERG "unregister_netdevice: "
5116 "waiting for %s to become free. Usage "
5118 dev->name, atomic_read(&dev->refcnt));
5119 warning_time = jiffies;
5128 * register_netdevice(x1);
5129 * register_netdevice(x2);
5131 * unregister_netdevice(y1);
5132 * unregister_netdevice(y2);
5138 * We are invoked by rtnl_unlock().
5139 * This allows us to deal with problems:
5140 * 1) We can delete sysfs objects which invoke hotplug
5141 * without deadlocking with linkwatch via keventd.
5142 * 2) Since we run with the RTNL semaphore not held, we can sleep
5143 * safely in order to wait for the netdev refcnt to drop to zero.
5145 * We must not return until all unregister events added during
5146 * the interval the lock was held have been completed.
5148 void netdev_run_todo(void)
5150 struct list_head list;
5152 /* Snapshot list, allow later requests */
5153 list_replace_init(&net_todo_list, &list);
5157 while (!list_empty(&list)) {
5158 struct net_device *dev
5159 = list_first_entry(&list, struct net_device, todo_list);
5160 list_del(&dev->todo_list);
5162 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5163 printk(KERN_ERR "network todo '%s' but state %d\n",
5164 dev->name, dev->reg_state);
5169 dev->reg_state = NETREG_UNREGISTERED;
5171 on_each_cpu(flush_backlog, dev, 1);
5173 netdev_wait_allrefs(dev);
5176 BUG_ON(atomic_read(&dev->refcnt));
5177 WARN_ON(dev->ip_ptr);
5178 WARN_ON(dev->ip6_ptr);
5179 WARN_ON(dev->dn_ptr);
5181 if (dev->destructor)
5182 dev->destructor(dev);
5184 /* Free network device */
5185 kobject_put(&dev->dev.kobj);
5190 * dev_txq_stats_fold - fold tx_queues stats
5191 * @dev: device to get statistics from
5192 * @stats: struct net_device_stats to hold results
5194 void dev_txq_stats_fold(const struct net_device *dev,
5195 struct net_device_stats *stats)
5197 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5199 struct netdev_queue *txq;
5201 for (i = 0; i < dev->num_tx_queues; i++) {
5202 txq = netdev_get_tx_queue(dev, i);
5203 tx_bytes += txq->tx_bytes;
5204 tx_packets += txq->tx_packets;
5205 tx_dropped += txq->tx_dropped;
5207 if (tx_bytes || tx_packets || tx_dropped) {
5208 stats->tx_bytes = tx_bytes;
5209 stats->tx_packets = tx_packets;
5210 stats->tx_dropped = tx_dropped;
5213 EXPORT_SYMBOL(dev_txq_stats_fold);
5216 * dev_get_stats - get network device statistics
5217 * @dev: device to get statistics from
5219 * Get network statistics from device. The device driver may provide
5220 * its own method by setting dev->netdev_ops->get_stats; otherwise
5221 * the internal statistics structure is used.
5223 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5225 const struct net_device_ops *ops = dev->netdev_ops;
5227 if (ops->ndo_get_stats)
5228 return ops->ndo_get_stats(dev);
5230 dev_txq_stats_fold(dev, &dev->stats);
5233 EXPORT_SYMBOL(dev_get_stats);
5235 static void netdev_init_one_queue(struct net_device *dev,
5236 struct netdev_queue *queue,
5242 static void netdev_init_queues(struct net_device *dev)
5244 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5245 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5246 spin_lock_init(&dev->tx_global_lock);
5250 * alloc_netdev_mq - allocate network device
5251 * @sizeof_priv: size of private data to allocate space for
5252 * @name: device name format string
5253 * @setup: callback to initialize device
5254 * @queue_count: the number of subqueues to allocate
5256 * Allocates a struct net_device with private data area for driver use
5257 * and performs basic initialization. Also allocates subquue structs
5258 * for each queue on the device at the end of the netdevice.
5260 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5261 void (*setup)(struct net_device *), unsigned int queue_count)
5263 struct netdev_queue *tx;
5264 struct net_device *dev;
5266 struct net_device *p;
5268 struct netdev_rx_queue *rx;
5272 BUG_ON(strlen(name) >= sizeof(dev->name));
5274 alloc_size = sizeof(struct net_device);
5276 /* ensure 32-byte alignment of private area */
5277 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5278 alloc_size += sizeof_priv;
5280 /* ensure 32-byte alignment of whole construct */
5281 alloc_size += NETDEV_ALIGN - 1;
5283 p = kzalloc(alloc_size, GFP_KERNEL);
5285 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5289 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5291 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5297 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5299 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5304 atomic_set(&rx->count, queue_count);
5307 * Set a pointer to first element in the array which holds the
5310 for (i = 0; i < queue_count; i++)
5314 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5315 dev->padded = (char *)dev - (char *)p;
5317 if (dev_addr_init(dev))
5323 dev_net_set(dev, &init_net);
5326 dev->num_tx_queues = queue_count;
5327 dev->real_num_tx_queues = queue_count;
5331 dev->num_rx_queues = queue_count;
5334 dev->gso_max_size = GSO_MAX_SIZE;
5336 netdev_init_queues(dev);
5338 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5339 dev->ethtool_ntuple_list.count = 0;
5340 INIT_LIST_HEAD(&dev->napi_list);
5341 INIT_LIST_HEAD(&dev->unreg_list);
5342 INIT_LIST_HEAD(&dev->link_watch_list);
5343 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5345 strcpy(dev->name, name);
5358 EXPORT_SYMBOL(alloc_netdev_mq);
5361 * free_netdev - free network device
5364 * This function does the last stage of destroying an allocated device
5365 * interface. The reference to the device object is released.
5366 * If this is the last reference then it will be freed.
5368 void free_netdev(struct net_device *dev)
5370 struct napi_struct *p, *n;
5372 release_net(dev_net(dev));
5376 /* Flush device addresses */
5377 dev_addr_flush(dev);
5379 /* Clear ethtool n-tuple list */
5380 ethtool_ntuple_flush(dev);
5382 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5385 /* Compatibility with error handling in drivers */
5386 if (dev->reg_state == NETREG_UNINITIALIZED) {
5387 kfree((char *)dev - dev->padded);
5391 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5392 dev->reg_state = NETREG_RELEASED;
5394 /* will free via device release */
5395 put_device(&dev->dev);
5397 EXPORT_SYMBOL(free_netdev);
5400 * synchronize_net - Synchronize with packet receive processing
5402 * Wait for packets currently being received to be done.
5403 * Does not block later packets from starting.
5405 void synchronize_net(void)
5410 EXPORT_SYMBOL(synchronize_net);
5413 * unregister_netdevice_queue - remove device from the kernel
5417 * This function shuts down a device interface and removes it
5418 * from the kernel tables.
5419 * If head not NULL, device is queued to be unregistered later.
5421 * Callers must hold the rtnl semaphore. You may want
5422 * unregister_netdev() instead of this.
5425 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5430 list_move_tail(&dev->unreg_list, head);
5432 rollback_registered(dev);
5433 /* Finish processing unregister after unlock */
5437 EXPORT_SYMBOL(unregister_netdevice_queue);
5440 * unregister_netdevice_many - unregister many devices
5441 * @head: list of devices
5443 void unregister_netdevice_many(struct list_head *head)
5445 struct net_device *dev;
5447 if (!list_empty(head)) {
5448 rollback_registered_many(head);
5449 list_for_each_entry(dev, head, unreg_list)
5453 EXPORT_SYMBOL(unregister_netdevice_many);
5456 * unregister_netdev - remove device from the kernel
5459 * This function shuts down a device interface and removes it
5460 * from the kernel tables.
5462 * This is just a wrapper for unregister_netdevice that takes
5463 * the rtnl semaphore. In general you want to use this and not
5464 * unregister_netdevice.
5466 void unregister_netdev(struct net_device *dev)
5469 unregister_netdevice(dev);
5472 EXPORT_SYMBOL(unregister_netdev);
5475 * dev_change_net_namespace - move device to different nethost namespace
5477 * @net: network namespace
5478 * @pat: If not NULL name pattern to try if the current device name
5479 * is already taken in the destination network namespace.
5481 * This function shuts down a device interface and moves it
5482 * to a new network namespace. On success 0 is returned, on
5483 * a failure a netagive errno code is returned.
5485 * Callers must hold the rtnl semaphore.
5488 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5494 /* Don't allow namespace local devices to be moved. */
5496 if (dev->features & NETIF_F_NETNS_LOCAL)
5500 /* Don't allow real devices to be moved when sysfs
5504 if (dev->dev.parent)
5508 /* Ensure the device has been registrered */
5510 if (dev->reg_state != NETREG_REGISTERED)
5513 /* Get out if there is nothing todo */
5515 if (net_eq(dev_net(dev), net))
5518 /* Pick the destination device name, and ensure
5519 * we can use it in the destination network namespace.
5522 if (__dev_get_by_name(net, dev->name)) {
5523 /* We get here if we can't use the current device name */
5526 if (dev_get_valid_name(net, pat, dev->name, 1))
5531 * And now a mini version of register_netdevice unregister_netdevice.
5534 /* If device is running close it first. */
5537 /* And unlink it from device chain */
5539 unlist_netdevice(dev);
5543 /* Shutdown queueing discipline. */
5546 /* Notify protocols, that we are about to destroy
5547 this device. They should clean all the things.
5549 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5550 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5553 * Flush the unicast and multicast chains
5558 netdev_unregister_kobject(dev);
5560 /* Actually switch the network namespace */
5561 dev_net_set(dev, net);
5563 /* If there is an ifindex conflict assign a new one */
5564 if (__dev_get_by_index(net, dev->ifindex)) {
5565 int iflink = (dev->iflink == dev->ifindex);
5566 dev->ifindex = dev_new_index(net);
5568 dev->iflink = dev->ifindex;
5571 /* Fixup kobjects */
5572 err = netdev_register_kobject(dev);
5575 /* Add the device back in the hashes */
5576 list_netdevice(dev);
5578 /* Notify protocols, that a new device appeared. */
5579 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5582 * Prevent userspace races by waiting until the network
5583 * device is fully setup before sending notifications.
5585 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5592 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5594 static int dev_cpu_callback(struct notifier_block *nfb,
5595 unsigned long action,
5598 struct sk_buff **list_skb;
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 /* Append output queue from offline CPU. */
5620 if (oldsd->output_queue) {
5621 *sd->output_queue_tailp = oldsd->output_queue;
5622 sd->output_queue_tailp = oldsd->output_queue_tailp;
5623 oldsd->output_queue = NULL;
5624 oldsd->output_queue_tailp = &oldsd->output_queue;
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);
5855 sd->output_queue = NULL;
5856 sd->output_queue_tailp = &sd->output_queue;
5858 sd->csd.func = rps_trigger_softirq;
5864 sd->backlog.poll = process_backlog;
5865 sd->backlog.weight = weight_p;
5866 sd->backlog.gro_list = NULL;
5867 sd->backlog.gro_count = 0;
5872 /* The loopback device is special if any other network devices
5873 * is present in a network namespace the loopback device must
5874 * be present. Since we now dynamically allocate and free the
5875 * loopback device ensure this invariant is maintained by
5876 * keeping the loopback device as the first device on the
5877 * list of network devices. Ensuring the loopback devices
5878 * is the first device that appears and the last network device
5881 if (register_pernet_device(&loopback_net_ops))
5884 if (register_pernet_device(&default_device_ops))
5887 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5888 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5890 hotcpu_notifier(dev_cpu_callback, 0);
5898 subsys_initcall(net_dev_init);
5900 static int __init initialize_hashrnd(void)
5902 get_random_bytes(&hashrnd, sizeof(hashrnd));
5906 late_initcall_sync(initialize_hashrnd);