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 */
2210 /* One global table that all flow-based protocols share. */
2211 struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
2212 EXPORT_SYMBOL(rps_sock_flow_table);
2215 * get_rps_cpu is called from netif_receive_skb and returns the target
2216 * CPU from the RPS map of the receiving queue for a given skb.
2217 * rcu_read_lock must be held on entry.
2219 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2220 struct rps_dev_flow **rflowp)
2222 struct ipv6hdr *ip6;
2224 struct netdev_rx_queue *rxqueue;
2225 struct rps_map *map;
2226 struct rps_dev_flow_table *flow_table;
2227 struct rps_sock_flow_table *sock_flow_table;
2231 u32 addr1, addr2, ihl;
2237 if (skb_rx_queue_recorded(skb)) {
2238 u16 index = skb_get_rx_queue(skb);
2239 if (unlikely(index >= dev->num_rx_queues)) {
2240 if (net_ratelimit()) {
2241 pr_warning("%s received packet on queue "
2242 "%u, but number of RX queues is %u\n",
2243 dev->name, index, dev->num_rx_queues);
2247 rxqueue = dev->_rx + index;
2251 if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
2255 goto got_hash; /* Skip hash computation on packet header */
2257 switch (skb->protocol) {
2258 case __constant_htons(ETH_P_IP):
2259 if (!pskb_may_pull(skb, sizeof(*ip)))
2262 ip = (struct iphdr *) skb->data;
2263 ip_proto = ip->protocol;
2264 addr1 = (__force u32) ip->saddr;
2265 addr2 = (__force u32) ip->daddr;
2268 case __constant_htons(ETH_P_IPV6):
2269 if (!pskb_may_pull(skb, sizeof(*ip6)))
2272 ip6 = (struct ipv6hdr *) skb->data;
2273 ip_proto = ip6->nexthdr;
2274 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2275 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2288 case IPPROTO_UDPLITE:
2289 if (pskb_may_pull(skb, (ihl * 4) + 4)) {
2290 ports.v32 = * (__force u32 *) (skb->data + (ihl * 4));
2291 if (ports.v16[1] < ports.v16[0])
2292 swap(ports.v16[0], ports.v16[1]);
2300 /* get a consistent hash (same value on both flow directions) */
2303 skb->rxhash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2308 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2309 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2310 if (flow_table && sock_flow_table) {
2312 struct rps_dev_flow *rflow;
2314 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2317 next_cpu = sock_flow_table->ents[skb->rxhash &
2318 sock_flow_table->mask];
2321 * If the desired CPU (where last recvmsg was done) is
2322 * different from current CPU (one in the rx-queue flow
2323 * table entry), switch if one of the following holds:
2324 * - Current CPU is unset (equal to RPS_NO_CPU).
2325 * - Current CPU is offline.
2326 * - The current CPU's queue tail has advanced beyond the
2327 * last packet that was enqueued using this table entry.
2328 * This guarantees that all previous packets for the flow
2329 * have been dequeued, thus preserving in order delivery.
2331 if (unlikely(tcpu != next_cpu) &&
2332 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2333 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2334 rflow->last_qtail)) >= 0)) {
2335 tcpu = rflow->cpu = next_cpu;
2336 if (tcpu != RPS_NO_CPU)
2337 rflow->last_qtail = per_cpu(softnet_data,
2338 tcpu).input_queue_head;
2340 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2347 map = rcu_dereference(rxqueue->rps_map);
2349 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2351 if (cpu_online(tcpu)) {
2361 /* Called from hardirq (IPI) context */
2362 static void rps_trigger_softirq(void *data)
2364 struct softnet_data *sd = data;
2366 __napi_schedule(&sd->backlog);
2370 #endif /* CONFIG_RPS */
2373 * Check if this softnet_data structure is another cpu one
2374 * If yes, queue it to our IPI list and return 1
2377 static int rps_ipi_queued(struct softnet_data *sd)
2380 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2383 sd->rps_ipi_next = mysd->rps_ipi_list;
2384 mysd->rps_ipi_list = sd;
2386 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2389 #endif /* CONFIG_RPS */
2394 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2395 * queue (may be a remote CPU queue).
2397 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2398 unsigned int *qtail)
2400 struct softnet_data *sd;
2401 unsigned long flags;
2403 sd = &per_cpu(softnet_data, cpu);
2405 local_irq_save(flags);
2408 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2409 if (skb_queue_len(&sd->input_pkt_queue)) {
2411 __skb_queue_tail(&sd->input_pkt_queue, skb);
2413 *qtail = sd->input_queue_head +
2414 skb_queue_len(&sd->input_pkt_queue);
2417 local_irq_restore(flags);
2418 return NET_RX_SUCCESS;
2421 /* Schedule NAPI for backlog device */
2422 if (napi_schedule_prep(&sd->backlog)) {
2423 if (!rps_ipi_queued(sd))
2424 __napi_schedule(&sd->backlog);
2432 local_irq_restore(flags);
2439 * netif_rx - post buffer to the network code
2440 * @skb: buffer to post
2442 * This function receives a packet from a device driver and queues it for
2443 * the upper (protocol) levels to process. It always succeeds. The buffer
2444 * may be dropped during processing for congestion control or by the
2448 * NET_RX_SUCCESS (no congestion)
2449 * NET_RX_DROP (packet was dropped)
2453 int netif_rx(struct sk_buff *skb)
2457 /* if netpoll wants it, pretend we never saw it */
2458 if (netpoll_rx(skb))
2461 if (!skb->tstamp.tv64)
2466 struct rps_dev_flow voidflow, *rflow = &voidflow;
2471 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2473 cpu = smp_processor_id();
2475 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2482 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2488 EXPORT_SYMBOL(netif_rx);
2490 int netif_rx_ni(struct sk_buff *skb)
2495 err = netif_rx(skb);
2496 if (local_softirq_pending())
2502 EXPORT_SYMBOL(netif_rx_ni);
2504 static void net_tx_action(struct softirq_action *h)
2506 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2508 if (sd->completion_queue) {
2509 struct sk_buff *clist;
2511 local_irq_disable();
2512 clist = sd->completion_queue;
2513 sd->completion_queue = NULL;
2517 struct sk_buff *skb = clist;
2518 clist = clist->next;
2520 WARN_ON(atomic_read(&skb->users));
2525 if (sd->output_queue) {
2528 local_irq_disable();
2529 head = sd->output_queue;
2530 sd->output_queue = NULL;
2531 sd->output_queue_tailp = &sd->output_queue;
2535 struct Qdisc *q = head;
2536 spinlock_t *root_lock;
2538 head = head->next_sched;
2540 root_lock = qdisc_lock(q);
2541 if (spin_trylock(root_lock)) {
2542 smp_mb__before_clear_bit();
2543 clear_bit(__QDISC_STATE_SCHED,
2546 spin_unlock(root_lock);
2548 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2550 __netif_reschedule(q);
2552 smp_mb__before_clear_bit();
2553 clear_bit(__QDISC_STATE_SCHED,
2561 static inline int deliver_skb(struct sk_buff *skb,
2562 struct packet_type *pt_prev,
2563 struct net_device *orig_dev)
2565 atomic_inc(&skb->users);
2566 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2569 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2571 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
2572 /* This hook is defined here for ATM LANE */
2573 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2574 unsigned char *addr) __read_mostly;
2575 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2579 * If bridge module is loaded call bridging hook.
2580 * returns NULL if packet was consumed.
2582 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2583 struct sk_buff *skb) __read_mostly;
2584 EXPORT_SYMBOL_GPL(br_handle_frame_hook);
2586 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2587 struct packet_type **pt_prev, int *ret,
2588 struct net_device *orig_dev)
2590 struct net_bridge_port *port;
2592 if (skb->pkt_type == PACKET_LOOPBACK ||
2593 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2597 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2601 return br_handle_frame_hook(port, skb);
2604 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2607 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2608 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2609 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2611 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2612 struct packet_type **pt_prev,
2614 struct net_device *orig_dev)
2616 if (skb->dev->macvlan_port == NULL)
2620 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2623 return macvlan_handle_frame_hook(skb);
2626 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2629 #ifdef CONFIG_NET_CLS_ACT
2630 /* TODO: Maybe we should just force sch_ingress to be compiled in
2631 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2632 * a compare and 2 stores extra right now if we dont have it on
2633 * but have CONFIG_NET_CLS_ACT
2634 * NOTE: This doesnt stop any functionality; if you dont have
2635 * the ingress scheduler, you just cant add policies on ingress.
2638 static int ing_filter(struct sk_buff *skb)
2640 struct net_device *dev = skb->dev;
2641 u32 ttl = G_TC_RTTL(skb->tc_verd);
2642 struct netdev_queue *rxq;
2643 int result = TC_ACT_OK;
2646 if (MAX_RED_LOOP < ttl++) {
2648 "Redir loop detected Dropping packet (%d->%d)\n",
2649 skb->skb_iif, dev->ifindex);
2653 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2654 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2656 rxq = &dev->rx_queue;
2659 if (q != &noop_qdisc) {
2660 spin_lock(qdisc_lock(q));
2661 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2662 result = qdisc_enqueue_root(skb, q);
2663 spin_unlock(qdisc_lock(q));
2669 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2670 struct packet_type **pt_prev,
2671 int *ret, struct net_device *orig_dev)
2673 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2677 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2680 /* Huh? Why does turning on AF_PACKET affect this? */
2681 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2684 switch (ing_filter(skb)) {
2698 * netif_nit_deliver - deliver received packets to network taps
2701 * This function is used to deliver incoming packets to network
2702 * taps. It should be used when the normal netif_receive_skb path
2703 * is bypassed, for example because of VLAN acceleration.
2705 void netif_nit_deliver(struct sk_buff *skb)
2707 struct packet_type *ptype;
2709 if (list_empty(&ptype_all))
2712 skb_reset_network_header(skb);
2713 skb_reset_transport_header(skb);
2714 skb->mac_len = skb->network_header - skb->mac_header;
2717 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2718 if (!ptype->dev || ptype->dev == skb->dev)
2719 deliver_skb(skb, ptype, skb->dev);
2724 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2725 struct net_device *master)
2727 if (skb->pkt_type == PACKET_HOST) {
2728 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2730 memcpy(dest, master->dev_addr, ETH_ALEN);
2734 /* On bonding slaves other than the currently active slave, suppress
2735 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2736 * ARP on active-backup slaves with arp_validate enabled.
2738 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2740 struct net_device *dev = skb->dev;
2742 if (master->priv_flags & IFF_MASTER_ARPMON)
2743 dev->last_rx = jiffies;
2745 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
2746 /* Do address unmangle. The local destination address
2747 * will be always the one master has. Provides the right
2748 * functionality in a bridge.
2750 skb_bond_set_mac_by_master(skb, master);
2753 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2754 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2755 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2758 if (master->priv_flags & IFF_MASTER_ALB) {
2759 if (skb->pkt_type != PACKET_BROADCAST &&
2760 skb->pkt_type != PACKET_MULTICAST)
2763 if (master->priv_flags & IFF_MASTER_8023AD &&
2764 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2771 EXPORT_SYMBOL(__skb_bond_should_drop);
2773 static int __netif_receive_skb(struct sk_buff *skb)
2775 struct packet_type *ptype, *pt_prev;
2776 struct net_device *orig_dev;
2777 struct net_device *master;
2778 struct net_device *null_or_orig;
2779 struct net_device *null_or_bond;
2780 int ret = NET_RX_DROP;
2783 if (!skb->tstamp.tv64)
2786 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2787 return NET_RX_SUCCESS;
2789 /* if we've gotten here through NAPI, check netpoll */
2790 if (netpoll_receive_skb(skb))
2794 skb->skb_iif = skb->dev->ifindex;
2796 null_or_orig = NULL;
2797 orig_dev = skb->dev;
2798 master = ACCESS_ONCE(orig_dev->master);
2800 if (skb_bond_should_drop(skb, master))
2801 null_or_orig = orig_dev; /* deliver only exact match */
2806 __get_cpu_var(softnet_data).processed++;
2808 skb_reset_network_header(skb);
2809 skb_reset_transport_header(skb);
2810 skb->mac_len = skb->network_header - skb->mac_header;
2816 #ifdef CONFIG_NET_CLS_ACT
2817 if (skb->tc_verd & TC_NCLS) {
2818 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2823 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2824 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2825 ptype->dev == orig_dev) {
2827 ret = deliver_skb(skb, pt_prev, orig_dev);
2832 #ifdef CONFIG_NET_CLS_ACT
2833 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2839 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2842 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2847 * Make sure frames received on VLAN interfaces stacked on
2848 * bonding interfaces still make their way to any base bonding
2849 * device that may have registered for a specific ptype. The
2850 * handler may have to adjust skb->dev and orig_dev.
2852 null_or_bond = NULL;
2853 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2854 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2855 null_or_bond = vlan_dev_real_dev(skb->dev);
2858 type = skb->protocol;
2859 list_for_each_entry_rcu(ptype,
2860 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2861 if (ptype->type == type && (ptype->dev == null_or_orig ||
2862 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2863 ptype->dev == null_or_bond)) {
2865 ret = deliver_skb(skb, pt_prev, orig_dev);
2871 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2874 /* Jamal, now you will not able to escape explaining
2875 * me how you were going to use this. :-)
2886 * netif_receive_skb - process receive buffer from network
2887 * @skb: buffer to process
2889 * netif_receive_skb() is the main receive data processing function.
2890 * It always succeeds. The buffer may be dropped during processing
2891 * for congestion control or by the protocol layers.
2893 * This function may only be called from softirq context and interrupts
2894 * should be enabled.
2896 * Return values (usually ignored):
2897 * NET_RX_SUCCESS: no congestion
2898 * NET_RX_DROP: packet was dropped
2900 int netif_receive_skb(struct sk_buff *skb)
2903 struct rps_dev_flow voidflow, *rflow = &voidflow;
2908 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2911 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2915 ret = __netif_receive_skb(skb);
2920 return __netif_receive_skb(skb);
2923 EXPORT_SYMBOL(netif_receive_skb);
2925 /* Network device is going away, flush any packets still pending
2926 * Called with irqs disabled.
2928 static void flush_backlog(void *arg)
2930 struct net_device *dev = arg;
2931 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2932 struct sk_buff *skb, *tmp;
2935 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
2936 if (skb->dev == dev) {
2937 __skb_unlink(skb, &sd->input_pkt_queue);
2939 input_queue_head_add(sd, 1);
2944 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
2945 if (skb->dev == dev) {
2946 __skb_unlink(skb, &sd->process_queue);
2952 static int napi_gro_complete(struct sk_buff *skb)
2954 struct packet_type *ptype;
2955 __be16 type = skb->protocol;
2956 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2959 if (NAPI_GRO_CB(skb)->count == 1) {
2960 skb_shinfo(skb)->gso_size = 0;
2965 list_for_each_entry_rcu(ptype, head, list) {
2966 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2969 err = ptype->gro_complete(skb);
2975 WARN_ON(&ptype->list == head);
2977 return NET_RX_SUCCESS;
2981 return netif_receive_skb(skb);
2984 static void napi_gro_flush(struct napi_struct *napi)
2986 struct sk_buff *skb, *next;
2988 for (skb = napi->gro_list; skb; skb = next) {
2991 napi_gro_complete(skb);
2994 napi->gro_count = 0;
2995 napi->gro_list = NULL;
2998 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3000 struct sk_buff **pp = NULL;
3001 struct packet_type *ptype;
3002 __be16 type = skb->protocol;
3003 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3006 enum gro_result ret;
3008 if (!(skb->dev->features & NETIF_F_GRO))
3011 if (skb_is_gso(skb) || skb_has_frags(skb))
3015 list_for_each_entry_rcu(ptype, head, list) {
3016 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3019 skb_set_network_header(skb, skb_gro_offset(skb));
3020 mac_len = skb->network_header - skb->mac_header;
3021 skb->mac_len = mac_len;
3022 NAPI_GRO_CB(skb)->same_flow = 0;
3023 NAPI_GRO_CB(skb)->flush = 0;
3024 NAPI_GRO_CB(skb)->free = 0;
3026 pp = ptype->gro_receive(&napi->gro_list, skb);
3031 if (&ptype->list == head)
3034 same_flow = NAPI_GRO_CB(skb)->same_flow;
3035 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3038 struct sk_buff *nskb = *pp;
3042 napi_gro_complete(nskb);
3049 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3053 NAPI_GRO_CB(skb)->count = 1;
3054 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3055 skb->next = napi->gro_list;
3056 napi->gro_list = skb;
3060 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3061 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3063 BUG_ON(skb->end - skb->tail < grow);
3065 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3068 skb->data_len -= grow;
3070 skb_shinfo(skb)->frags[0].page_offset += grow;
3071 skb_shinfo(skb)->frags[0].size -= grow;
3073 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3074 put_page(skb_shinfo(skb)->frags[0].page);
3075 memmove(skb_shinfo(skb)->frags,
3076 skb_shinfo(skb)->frags + 1,
3077 --skb_shinfo(skb)->nr_frags);
3088 EXPORT_SYMBOL(dev_gro_receive);
3091 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3095 if (netpoll_rx_on(skb))
3098 for (p = napi->gro_list; p; p = p->next) {
3099 NAPI_GRO_CB(p)->same_flow =
3100 (p->dev == skb->dev) &&
3101 !compare_ether_header(skb_mac_header(p),
3102 skb_gro_mac_header(skb));
3103 NAPI_GRO_CB(p)->flush = 0;
3106 return dev_gro_receive(napi, skb);
3109 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3113 if (netif_receive_skb(skb))
3118 case GRO_MERGED_FREE:
3129 EXPORT_SYMBOL(napi_skb_finish);
3131 void skb_gro_reset_offset(struct sk_buff *skb)
3133 NAPI_GRO_CB(skb)->data_offset = 0;
3134 NAPI_GRO_CB(skb)->frag0 = NULL;
3135 NAPI_GRO_CB(skb)->frag0_len = 0;
3137 if (skb->mac_header == skb->tail &&
3138 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3139 NAPI_GRO_CB(skb)->frag0 =
3140 page_address(skb_shinfo(skb)->frags[0].page) +
3141 skb_shinfo(skb)->frags[0].page_offset;
3142 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3145 EXPORT_SYMBOL(skb_gro_reset_offset);
3147 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3149 skb_gro_reset_offset(skb);
3151 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3153 EXPORT_SYMBOL(napi_gro_receive);
3155 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3157 __skb_pull(skb, skb_headlen(skb));
3158 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3162 EXPORT_SYMBOL(napi_reuse_skb);
3164 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3166 struct sk_buff *skb = napi->skb;
3169 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3175 EXPORT_SYMBOL(napi_get_frags);
3177 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3183 skb->protocol = eth_type_trans(skb, skb->dev);
3185 if (ret == GRO_HELD)
3186 skb_gro_pull(skb, -ETH_HLEN);
3187 else if (netif_receive_skb(skb))
3192 case GRO_MERGED_FREE:
3193 napi_reuse_skb(napi, skb);
3202 EXPORT_SYMBOL(napi_frags_finish);
3204 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3206 struct sk_buff *skb = napi->skb;
3213 skb_reset_mac_header(skb);
3214 skb_gro_reset_offset(skb);
3216 off = skb_gro_offset(skb);
3217 hlen = off + sizeof(*eth);
3218 eth = skb_gro_header_fast(skb, off);
3219 if (skb_gro_header_hard(skb, hlen)) {
3220 eth = skb_gro_header_slow(skb, hlen, off);
3221 if (unlikely(!eth)) {
3222 napi_reuse_skb(napi, skb);
3228 skb_gro_pull(skb, sizeof(*eth));
3231 * This works because the only protocols we care about don't require
3232 * special handling. We'll fix it up properly at the end.
3234 skb->protocol = eth->h_proto;
3239 EXPORT_SYMBOL(napi_frags_skb);
3241 gro_result_t napi_gro_frags(struct napi_struct *napi)
3243 struct sk_buff *skb = napi_frags_skb(napi);
3248 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3250 EXPORT_SYMBOL(napi_gro_frags);
3253 * net_rps_action sends any pending IPI's for rps.
3254 * Note: called with local irq disabled, but exits with local irq enabled.
3256 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3259 struct softnet_data *remsd = sd->rps_ipi_list;
3262 sd->rps_ipi_list = NULL;
3266 /* Send pending IPI's to kick RPS processing on remote cpus. */
3268 struct softnet_data *next = remsd->rps_ipi_next;
3270 if (cpu_online(remsd->cpu))
3271 __smp_call_function_single(remsd->cpu,
3280 static int process_backlog(struct napi_struct *napi, int quota)
3283 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3286 /* Check if we have pending ipi, its better to send them now,
3287 * not waiting net_rx_action() end.
3289 if (sd->rps_ipi_list) {
3290 local_irq_disable();
3291 net_rps_action_and_irq_enable(sd);
3294 napi->weight = weight_p;
3295 local_irq_disable();
3296 while (work < quota) {
3297 struct sk_buff *skb;
3300 while ((skb = __skb_dequeue(&sd->process_queue))) {
3302 __netif_receive_skb(skb);
3303 if (++work >= quota)
3305 local_irq_disable();
3309 qlen = skb_queue_len(&sd->input_pkt_queue);
3311 input_queue_head_add(sd, qlen);
3312 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3313 &sd->process_queue);
3315 if (qlen < quota - work) {
3316 __napi_complete(napi);
3317 quota = work + qlen;
3327 * __napi_schedule - schedule for receive
3328 * @n: entry to schedule
3330 * The entry's receive function will be scheduled to run
3332 void __napi_schedule(struct napi_struct *n)
3334 unsigned long flags;
3336 local_irq_save(flags);
3337 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
3338 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3339 local_irq_restore(flags);
3341 EXPORT_SYMBOL(__napi_schedule);
3343 void __napi_complete(struct napi_struct *n)
3345 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3346 BUG_ON(n->gro_list);
3348 list_del(&n->poll_list);
3349 smp_mb__before_clear_bit();
3350 clear_bit(NAPI_STATE_SCHED, &n->state);
3352 EXPORT_SYMBOL(__napi_complete);
3354 void napi_complete(struct napi_struct *n)
3356 unsigned long flags;
3359 * don't let napi dequeue from the cpu poll list
3360 * just in case its running on a different cpu
3362 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3366 local_irq_save(flags);
3368 local_irq_restore(flags);
3370 EXPORT_SYMBOL(napi_complete);
3372 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3373 int (*poll)(struct napi_struct *, int), int weight)
3375 INIT_LIST_HEAD(&napi->poll_list);
3376 napi->gro_count = 0;
3377 napi->gro_list = NULL;
3380 napi->weight = weight;
3381 list_add(&napi->dev_list, &dev->napi_list);
3383 #ifdef CONFIG_NETPOLL
3384 spin_lock_init(&napi->poll_lock);
3385 napi->poll_owner = -1;
3387 set_bit(NAPI_STATE_SCHED, &napi->state);
3389 EXPORT_SYMBOL(netif_napi_add);
3391 void netif_napi_del(struct napi_struct *napi)
3393 struct sk_buff *skb, *next;
3395 list_del_init(&napi->dev_list);
3396 napi_free_frags(napi);
3398 for (skb = napi->gro_list; skb; skb = next) {
3404 napi->gro_list = NULL;
3405 napi->gro_count = 0;
3407 EXPORT_SYMBOL(netif_napi_del);
3409 static void net_rx_action(struct softirq_action *h)
3411 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3412 unsigned long time_limit = jiffies + 2;
3413 int budget = netdev_budget;
3416 local_irq_disable();
3418 while (!list_empty(&sd->poll_list)) {
3419 struct napi_struct *n;
3422 /* If softirq window is exhuasted then punt.
3423 * Allow this to run for 2 jiffies since which will allow
3424 * an average latency of 1.5/HZ.
3426 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3431 /* Even though interrupts have been re-enabled, this
3432 * access is safe because interrupts can only add new
3433 * entries to the tail of this list, and only ->poll()
3434 * calls can remove this head entry from the list.
3436 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3438 have = netpoll_poll_lock(n);
3442 /* This NAPI_STATE_SCHED test is for avoiding a race
3443 * with netpoll's poll_napi(). Only the entity which
3444 * obtains the lock and sees NAPI_STATE_SCHED set will
3445 * actually make the ->poll() call. Therefore we avoid
3446 * accidently calling ->poll() when NAPI is not scheduled.
3449 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3450 work = n->poll(n, weight);
3454 WARN_ON_ONCE(work > weight);
3458 local_irq_disable();
3460 /* Drivers must not modify the NAPI state if they
3461 * consume the entire weight. In such cases this code
3462 * still "owns" the NAPI instance and therefore can
3463 * move the instance around on the list at-will.
3465 if (unlikely(work == weight)) {
3466 if (unlikely(napi_disable_pending(n))) {
3469 local_irq_disable();
3471 list_move_tail(&n->poll_list, &sd->poll_list);
3474 netpoll_poll_unlock(have);
3477 net_rps_action_and_irq_enable(sd);
3479 #ifdef CONFIG_NET_DMA
3481 * There may not be any more sk_buffs coming right now, so push
3482 * any pending DMA copies to hardware
3484 dma_issue_pending_all();
3491 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3495 static gifconf_func_t *gifconf_list[NPROTO];
3498 * register_gifconf - register a SIOCGIF handler
3499 * @family: Address family
3500 * @gifconf: Function handler
3502 * Register protocol dependent address dumping routines. The handler
3503 * that is passed must not be freed or reused until it has been replaced
3504 * by another handler.
3506 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3508 if (family >= NPROTO)
3510 gifconf_list[family] = gifconf;
3513 EXPORT_SYMBOL(register_gifconf);
3517 * Map an interface index to its name (SIOCGIFNAME)
3521 * We need this ioctl for efficient implementation of the
3522 * if_indextoname() function required by the IPv6 API. Without
3523 * it, we would have to search all the interfaces to find a
3527 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3529 struct net_device *dev;
3533 * Fetch the caller's info block.
3536 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3540 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3546 strcpy(ifr.ifr_name, dev->name);
3549 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3555 * Perform a SIOCGIFCONF call. This structure will change
3556 * size eventually, and there is nothing I can do about it.
3557 * Thus we will need a 'compatibility mode'.
3560 static int dev_ifconf(struct net *net, char __user *arg)
3563 struct net_device *dev;
3570 * Fetch the caller's info block.
3573 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3580 * Loop over the interfaces, and write an info block for each.
3584 for_each_netdev(net, dev) {
3585 for (i = 0; i < NPROTO; i++) {
3586 if (gifconf_list[i]) {
3589 done = gifconf_list[i](dev, NULL, 0);
3591 done = gifconf_list[i](dev, pos + total,
3601 * All done. Write the updated control block back to the caller.
3603 ifc.ifc_len = total;
3606 * Both BSD and Solaris return 0 here, so we do too.
3608 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3611 #ifdef CONFIG_PROC_FS
3613 * This is invoked by the /proc filesystem handler to display a device
3616 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3619 struct net *net = seq_file_net(seq);
3621 struct net_device *dev;
3625 return SEQ_START_TOKEN;
3628 for_each_netdev_rcu(net, dev)
3635 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3637 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3638 first_net_device(seq_file_net(seq)) :
3639 next_net_device((struct net_device *)v);
3642 return rcu_dereference(dev);
3645 void dev_seq_stop(struct seq_file *seq, void *v)
3651 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3653 const struct net_device_stats *stats = dev_get_stats(dev);
3655 seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3656 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3657 dev->name, stats->rx_bytes, stats->rx_packets,
3659 stats->rx_dropped + stats->rx_missed_errors,
3660 stats->rx_fifo_errors,
3661 stats->rx_length_errors + stats->rx_over_errors +
3662 stats->rx_crc_errors + stats->rx_frame_errors,
3663 stats->rx_compressed, stats->multicast,
3664 stats->tx_bytes, stats->tx_packets,
3665 stats->tx_errors, stats->tx_dropped,
3666 stats->tx_fifo_errors, stats->collisions,
3667 stats->tx_carrier_errors +
3668 stats->tx_aborted_errors +
3669 stats->tx_window_errors +
3670 stats->tx_heartbeat_errors,
3671 stats->tx_compressed);
3675 * Called from the PROCfs module. This now uses the new arbitrary sized
3676 * /proc/net interface to create /proc/net/dev
3678 static int dev_seq_show(struct seq_file *seq, void *v)
3680 if (v == SEQ_START_TOKEN)
3681 seq_puts(seq, "Inter-| Receive "
3683 " face |bytes packets errs drop fifo frame "
3684 "compressed multicast|bytes packets errs "
3685 "drop fifo colls carrier compressed\n");
3687 dev_seq_printf_stats(seq, v);
3691 static struct softnet_data *softnet_get_online(loff_t *pos)
3693 struct softnet_data *sd = NULL;
3695 while (*pos < nr_cpu_ids)
3696 if (cpu_online(*pos)) {
3697 sd = &per_cpu(softnet_data, *pos);
3704 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3706 return softnet_get_online(pos);
3709 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3712 return softnet_get_online(pos);
3715 static void softnet_seq_stop(struct seq_file *seq, void *v)
3719 static int softnet_seq_show(struct seq_file *seq, void *v)
3721 struct softnet_data *sd = v;
3723 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3724 sd->processed, sd->dropped, sd->time_squeeze, 0,
3725 0, 0, 0, 0, /* was fastroute */
3726 sd->cpu_collision, sd->received_rps);
3730 static const struct seq_operations dev_seq_ops = {
3731 .start = dev_seq_start,
3732 .next = dev_seq_next,
3733 .stop = dev_seq_stop,
3734 .show = dev_seq_show,
3737 static int dev_seq_open(struct inode *inode, struct file *file)
3739 return seq_open_net(inode, file, &dev_seq_ops,
3740 sizeof(struct seq_net_private));
3743 static const struct file_operations dev_seq_fops = {
3744 .owner = THIS_MODULE,
3745 .open = dev_seq_open,
3747 .llseek = seq_lseek,
3748 .release = seq_release_net,
3751 static const struct seq_operations softnet_seq_ops = {
3752 .start = softnet_seq_start,
3753 .next = softnet_seq_next,
3754 .stop = softnet_seq_stop,
3755 .show = softnet_seq_show,
3758 static int softnet_seq_open(struct inode *inode, struct file *file)
3760 return seq_open(file, &softnet_seq_ops);
3763 static const struct file_operations softnet_seq_fops = {
3764 .owner = THIS_MODULE,
3765 .open = softnet_seq_open,
3767 .llseek = seq_lseek,
3768 .release = seq_release,
3771 static void *ptype_get_idx(loff_t pos)
3773 struct packet_type *pt = NULL;
3777 list_for_each_entry_rcu(pt, &ptype_all, list) {
3783 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3784 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3793 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3797 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3800 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3802 struct packet_type *pt;
3803 struct list_head *nxt;
3807 if (v == SEQ_START_TOKEN)
3808 return ptype_get_idx(0);
3811 nxt = pt->list.next;
3812 if (pt->type == htons(ETH_P_ALL)) {
3813 if (nxt != &ptype_all)
3816 nxt = ptype_base[0].next;
3818 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3820 while (nxt == &ptype_base[hash]) {
3821 if (++hash >= PTYPE_HASH_SIZE)
3823 nxt = ptype_base[hash].next;
3826 return list_entry(nxt, struct packet_type, list);
3829 static void ptype_seq_stop(struct seq_file *seq, void *v)
3835 static int ptype_seq_show(struct seq_file *seq, void *v)
3837 struct packet_type *pt = v;
3839 if (v == SEQ_START_TOKEN)
3840 seq_puts(seq, "Type Device Function\n");
3841 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3842 if (pt->type == htons(ETH_P_ALL))
3843 seq_puts(seq, "ALL ");
3845 seq_printf(seq, "%04x", ntohs(pt->type));
3847 seq_printf(seq, " %-8s %pF\n",
3848 pt->dev ? pt->dev->name : "", pt->func);
3854 static const struct seq_operations ptype_seq_ops = {
3855 .start = ptype_seq_start,
3856 .next = ptype_seq_next,
3857 .stop = ptype_seq_stop,
3858 .show = ptype_seq_show,
3861 static int ptype_seq_open(struct inode *inode, struct file *file)
3863 return seq_open_net(inode, file, &ptype_seq_ops,
3864 sizeof(struct seq_net_private));
3867 static const struct file_operations ptype_seq_fops = {
3868 .owner = THIS_MODULE,
3869 .open = ptype_seq_open,
3871 .llseek = seq_lseek,
3872 .release = seq_release_net,
3876 static int __net_init dev_proc_net_init(struct net *net)
3880 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3882 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3884 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3887 if (wext_proc_init(net))
3893 proc_net_remove(net, "ptype");
3895 proc_net_remove(net, "softnet_stat");
3897 proc_net_remove(net, "dev");
3901 static void __net_exit dev_proc_net_exit(struct net *net)
3903 wext_proc_exit(net);
3905 proc_net_remove(net, "ptype");
3906 proc_net_remove(net, "softnet_stat");
3907 proc_net_remove(net, "dev");
3910 static struct pernet_operations __net_initdata dev_proc_ops = {
3911 .init = dev_proc_net_init,
3912 .exit = dev_proc_net_exit,
3915 static int __init dev_proc_init(void)
3917 return register_pernet_subsys(&dev_proc_ops);
3920 #define dev_proc_init() 0
3921 #endif /* CONFIG_PROC_FS */
3925 * netdev_set_master - set up master/slave pair
3926 * @slave: slave device
3927 * @master: new master device
3929 * Changes the master device of the slave. Pass %NULL to break the
3930 * bonding. The caller must hold the RTNL semaphore. On a failure
3931 * a negative errno code is returned. On success the reference counts
3932 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3933 * function returns zero.
3935 int netdev_set_master(struct net_device *slave, struct net_device *master)
3937 struct net_device *old = slave->master;
3947 slave->master = master;
3954 slave->flags |= IFF_SLAVE;
3956 slave->flags &= ~IFF_SLAVE;
3958 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3961 EXPORT_SYMBOL(netdev_set_master);
3963 static void dev_change_rx_flags(struct net_device *dev, int flags)
3965 const struct net_device_ops *ops = dev->netdev_ops;
3967 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3968 ops->ndo_change_rx_flags(dev, flags);
3971 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3973 unsigned short old_flags = dev->flags;
3979 dev->flags |= IFF_PROMISC;
3980 dev->promiscuity += inc;
3981 if (dev->promiscuity == 0) {
3984 * If inc causes overflow, untouch promisc and return error.
3987 dev->flags &= ~IFF_PROMISC;
3989 dev->promiscuity -= inc;
3990 printk(KERN_WARNING "%s: promiscuity touches roof, "
3991 "set promiscuity failed, promiscuity feature "
3992 "of device might be broken.\n", dev->name);
3996 if (dev->flags != old_flags) {
3997 printk(KERN_INFO "device %s %s promiscuous mode\n",
3998 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4000 if (audit_enabled) {
4001 current_uid_gid(&uid, &gid);
4002 audit_log(current->audit_context, GFP_ATOMIC,
4003 AUDIT_ANOM_PROMISCUOUS,
4004 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4005 dev->name, (dev->flags & IFF_PROMISC),
4006 (old_flags & IFF_PROMISC),
4007 audit_get_loginuid(current),
4009 audit_get_sessionid(current));
4012 dev_change_rx_flags(dev, IFF_PROMISC);
4018 * dev_set_promiscuity - update promiscuity count on a device
4022 * Add or remove promiscuity from a device. While the count in the device
4023 * remains above zero the interface remains promiscuous. Once it hits zero
4024 * the device reverts back to normal filtering operation. A negative inc
4025 * value is used to drop promiscuity on the device.
4026 * Return 0 if successful or a negative errno code on error.
4028 int dev_set_promiscuity(struct net_device *dev, int inc)
4030 unsigned short old_flags = dev->flags;
4033 err = __dev_set_promiscuity(dev, inc);
4036 if (dev->flags != old_flags)
4037 dev_set_rx_mode(dev);
4040 EXPORT_SYMBOL(dev_set_promiscuity);
4043 * dev_set_allmulti - update allmulti count on a device
4047 * Add or remove reception of all multicast frames to a device. While the
4048 * count in the device remains above zero the interface remains listening
4049 * to all interfaces. Once it hits zero the device reverts back to normal
4050 * filtering operation. A negative @inc value is used to drop the counter
4051 * when releasing a resource needing all multicasts.
4052 * Return 0 if successful or a negative errno code on error.
4055 int dev_set_allmulti(struct net_device *dev, int inc)
4057 unsigned short old_flags = dev->flags;
4061 dev->flags |= IFF_ALLMULTI;
4062 dev->allmulti += inc;
4063 if (dev->allmulti == 0) {
4066 * If inc causes overflow, untouch allmulti and return error.
4069 dev->flags &= ~IFF_ALLMULTI;
4071 dev->allmulti -= inc;
4072 printk(KERN_WARNING "%s: allmulti touches roof, "
4073 "set allmulti failed, allmulti feature of "
4074 "device might be broken.\n", dev->name);
4078 if (dev->flags ^ old_flags) {
4079 dev_change_rx_flags(dev, IFF_ALLMULTI);
4080 dev_set_rx_mode(dev);
4084 EXPORT_SYMBOL(dev_set_allmulti);
4087 * Upload unicast and multicast address lists to device and
4088 * configure RX filtering. When the device doesn't support unicast
4089 * filtering it is put in promiscuous mode while unicast addresses
4092 void __dev_set_rx_mode(struct net_device *dev)
4094 const struct net_device_ops *ops = dev->netdev_ops;
4096 /* dev_open will call this function so the list will stay sane. */
4097 if (!(dev->flags&IFF_UP))
4100 if (!netif_device_present(dev))
4103 if (ops->ndo_set_rx_mode)
4104 ops->ndo_set_rx_mode(dev);
4106 /* Unicast addresses changes may only happen under the rtnl,
4107 * therefore calling __dev_set_promiscuity here is safe.
4109 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4110 __dev_set_promiscuity(dev, 1);
4111 dev->uc_promisc = 1;
4112 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4113 __dev_set_promiscuity(dev, -1);
4114 dev->uc_promisc = 0;
4117 if (ops->ndo_set_multicast_list)
4118 ops->ndo_set_multicast_list(dev);
4122 void dev_set_rx_mode(struct net_device *dev)
4124 netif_addr_lock_bh(dev);
4125 __dev_set_rx_mode(dev);
4126 netif_addr_unlock_bh(dev);
4130 * dev_get_flags - get flags reported to userspace
4133 * Get the combination of flag bits exported through APIs to userspace.
4135 unsigned dev_get_flags(const struct net_device *dev)
4139 flags = (dev->flags & ~(IFF_PROMISC |
4144 (dev->gflags & (IFF_PROMISC |
4147 if (netif_running(dev)) {
4148 if (netif_oper_up(dev))
4149 flags |= IFF_RUNNING;
4150 if (netif_carrier_ok(dev))
4151 flags |= IFF_LOWER_UP;
4152 if (netif_dormant(dev))
4153 flags |= IFF_DORMANT;
4158 EXPORT_SYMBOL(dev_get_flags);
4160 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4162 int old_flags = dev->flags;
4168 * Set the flags on our device.
4171 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4172 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4174 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4178 * Load in the correct multicast list now the flags have changed.
4181 if ((old_flags ^ flags) & IFF_MULTICAST)
4182 dev_change_rx_flags(dev, IFF_MULTICAST);
4184 dev_set_rx_mode(dev);
4187 * Have we downed the interface. We handle IFF_UP ourselves
4188 * according to user attempts to set it, rather than blindly
4193 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4194 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4197 dev_set_rx_mode(dev);
4200 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4201 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4203 dev->gflags ^= IFF_PROMISC;
4204 dev_set_promiscuity(dev, inc);
4207 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4208 is important. Some (broken) drivers set IFF_PROMISC, when
4209 IFF_ALLMULTI is requested not asking us and not reporting.
4211 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4212 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4214 dev->gflags ^= IFF_ALLMULTI;
4215 dev_set_allmulti(dev, inc);
4221 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4223 unsigned int changes = dev->flags ^ old_flags;
4225 if (changes & IFF_UP) {
4226 if (dev->flags & IFF_UP)
4227 call_netdevice_notifiers(NETDEV_UP, dev);
4229 call_netdevice_notifiers(NETDEV_DOWN, dev);
4232 if (dev->flags & IFF_UP &&
4233 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4234 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4238 * dev_change_flags - change device settings
4240 * @flags: device state flags
4242 * Change settings on device based state flags. The flags are
4243 * in the userspace exported format.
4245 int dev_change_flags(struct net_device *dev, unsigned flags)
4248 int old_flags = dev->flags;
4250 ret = __dev_change_flags(dev, flags);
4254 changes = old_flags ^ dev->flags;
4256 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4258 __dev_notify_flags(dev, old_flags);
4261 EXPORT_SYMBOL(dev_change_flags);
4264 * dev_set_mtu - Change maximum transfer unit
4266 * @new_mtu: new transfer unit
4268 * Change the maximum transfer size of the network device.
4270 int dev_set_mtu(struct net_device *dev, int new_mtu)
4272 const struct net_device_ops *ops = dev->netdev_ops;
4275 if (new_mtu == dev->mtu)
4278 /* MTU must be positive. */
4282 if (!netif_device_present(dev))
4286 if (ops->ndo_change_mtu)
4287 err = ops->ndo_change_mtu(dev, new_mtu);
4291 if (!err && dev->flags & IFF_UP)
4292 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4295 EXPORT_SYMBOL(dev_set_mtu);
4298 * dev_set_mac_address - Change Media Access Control Address
4302 * Change the hardware (MAC) address of the device
4304 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4306 const struct net_device_ops *ops = dev->netdev_ops;
4309 if (!ops->ndo_set_mac_address)
4311 if (sa->sa_family != dev->type)
4313 if (!netif_device_present(dev))
4315 err = ops->ndo_set_mac_address(dev, sa);
4317 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4320 EXPORT_SYMBOL(dev_set_mac_address);
4323 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4325 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4328 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4334 case SIOCGIFFLAGS: /* Get interface flags */
4335 ifr->ifr_flags = (short) dev_get_flags(dev);
4338 case SIOCGIFMETRIC: /* Get the metric on the interface
4339 (currently unused) */
4340 ifr->ifr_metric = 0;
4343 case SIOCGIFMTU: /* Get the MTU of a device */
4344 ifr->ifr_mtu = dev->mtu;
4349 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4351 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4352 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4353 ifr->ifr_hwaddr.sa_family = dev->type;
4361 ifr->ifr_map.mem_start = dev->mem_start;
4362 ifr->ifr_map.mem_end = dev->mem_end;
4363 ifr->ifr_map.base_addr = dev->base_addr;
4364 ifr->ifr_map.irq = dev->irq;
4365 ifr->ifr_map.dma = dev->dma;
4366 ifr->ifr_map.port = dev->if_port;
4370 ifr->ifr_ifindex = dev->ifindex;
4374 ifr->ifr_qlen = dev->tx_queue_len;
4378 /* dev_ioctl() should ensure this case
4390 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4392 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4395 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4396 const struct net_device_ops *ops;
4401 ops = dev->netdev_ops;
4404 case SIOCSIFFLAGS: /* Set interface flags */
4405 return dev_change_flags(dev, ifr->ifr_flags);
4407 case SIOCSIFMETRIC: /* Set the metric on the interface
4408 (currently unused) */
4411 case SIOCSIFMTU: /* Set the MTU of a device */
4412 return dev_set_mtu(dev, ifr->ifr_mtu);
4415 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4417 case SIOCSIFHWBROADCAST:
4418 if (ifr->ifr_hwaddr.sa_family != dev->type)
4420 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4421 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4422 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4426 if (ops->ndo_set_config) {
4427 if (!netif_device_present(dev))
4429 return ops->ndo_set_config(dev, &ifr->ifr_map);
4434 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4435 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4437 if (!netif_device_present(dev))
4439 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4442 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4443 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4445 if (!netif_device_present(dev))
4447 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4450 if (ifr->ifr_qlen < 0)
4452 dev->tx_queue_len = ifr->ifr_qlen;
4456 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4457 return dev_change_name(dev, ifr->ifr_newname);
4460 * Unknown or private ioctl
4463 if ((cmd >= SIOCDEVPRIVATE &&
4464 cmd <= SIOCDEVPRIVATE + 15) ||
4465 cmd == SIOCBONDENSLAVE ||
4466 cmd == SIOCBONDRELEASE ||
4467 cmd == SIOCBONDSETHWADDR ||
4468 cmd == SIOCBONDSLAVEINFOQUERY ||
4469 cmd == SIOCBONDINFOQUERY ||
4470 cmd == SIOCBONDCHANGEACTIVE ||
4471 cmd == SIOCGMIIPHY ||
4472 cmd == SIOCGMIIREG ||
4473 cmd == SIOCSMIIREG ||
4474 cmd == SIOCBRADDIF ||
4475 cmd == SIOCBRDELIF ||
4476 cmd == SIOCSHWTSTAMP ||
4477 cmd == SIOCWANDEV) {
4479 if (ops->ndo_do_ioctl) {
4480 if (netif_device_present(dev))
4481 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4493 * This function handles all "interface"-type I/O control requests. The actual
4494 * 'doing' part of this is dev_ifsioc above.
4498 * dev_ioctl - network device ioctl
4499 * @net: the applicable net namespace
4500 * @cmd: command to issue
4501 * @arg: pointer to a struct ifreq in user space
4503 * Issue ioctl functions to devices. This is normally called by the
4504 * user space syscall interfaces but can sometimes be useful for
4505 * other purposes. The return value is the return from the syscall if
4506 * positive or a negative errno code on error.
4509 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4515 /* One special case: SIOCGIFCONF takes ifconf argument
4516 and requires shared lock, because it sleeps writing
4520 if (cmd == SIOCGIFCONF) {
4522 ret = dev_ifconf(net, (char __user *) arg);
4526 if (cmd == SIOCGIFNAME)
4527 return dev_ifname(net, (struct ifreq __user *)arg);
4529 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4532 ifr.ifr_name[IFNAMSIZ-1] = 0;
4534 colon = strchr(ifr.ifr_name, ':');
4539 * See which interface the caller is talking about.
4544 * These ioctl calls:
4545 * - can be done by all.
4546 * - atomic and do not require locking.
4557 dev_load(net, ifr.ifr_name);
4559 ret = dev_ifsioc_locked(net, &ifr, cmd);
4564 if (copy_to_user(arg, &ifr,
4565 sizeof(struct ifreq)))
4571 dev_load(net, ifr.ifr_name);
4573 ret = dev_ethtool(net, &ifr);
4578 if (copy_to_user(arg, &ifr,
4579 sizeof(struct ifreq)))
4585 * These ioctl calls:
4586 * - require superuser power.
4587 * - require strict serialization.
4593 if (!capable(CAP_NET_ADMIN))
4595 dev_load(net, ifr.ifr_name);
4597 ret = dev_ifsioc(net, &ifr, cmd);
4602 if (copy_to_user(arg, &ifr,
4603 sizeof(struct ifreq)))
4609 * These ioctl calls:
4610 * - require superuser power.
4611 * - require strict serialization.
4612 * - do not return a value
4622 case SIOCSIFHWBROADCAST:
4625 case SIOCBONDENSLAVE:
4626 case SIOCBONDRELEASE:
4627 case SIOCBONDSETHWADDR:
4628 case SIOCBONDCHANGEACTIVE:
4632 if (!capable(CAP_NET_ADMIN))
4635 case SIOCBONDSLAVEINFOQUERY:
4636 case SIOCBONDINFOQUERY:
4637 dev_load(net, ifr.ifr_name);
4639 ret = dev_ifsioc(net, &ifr, cmd);
4644 /* Get the per device memory space. We can add this but
4645 * currently do not support it */
4647 /* Set the per device memory buffer space.
4648 * Not applicable in our case */
4653 * Unknown or private ioctl.
4656 if (cmd == SIOCWANDEV ||
4657 (cmd >= SIOCDEVPRIVATE &&
4658 cmd <= SIOCDEVPRIVATE + 15)) {
4659 dev_load(net, ifr.ifr_name);
4661 ret = dev_ifsioc(net, &ifr, cmd);
4663 if (!ret && copy_to_user(arg, &ifr,
4664 sizeof(struct ifreq)))
4668 /* Take care of Wireless Extensions */
4669 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4670 return wext_handle_ioctl(net, &ifr, cmd, arg);
4677 * dev_new_index - allocate an ifindex
4678 * @net: the applicable net namespace
4680 * Returns a suitable unique value for a new device interface
4681 * number. The caller must hold the rtnl semaphore or the
4682 * dev_base_lock to be sure it remains unique.
4684 static int dev_new_index(struct net *net)
4690 if (!__dev_get_by_index(net, ifindex))
4695 /* Delayed registration/unregisteration */
4696 static LIST_HEAD(net_todo_list);
4698 static void net_set_todo(struct net_device *dev)
4700 list_add_tail(&dev->todo_list, &net_todo_list);
4703 static void rollback_registered_many(struct list_head *head)
4705 struct net_device *dev, *tmp;
4707 BUG_ON(dev_boot_phase);
4710 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4711 /* Some devices call without registering
4712 * for initialization unwind. Remove those
4713 * devices and proceed with the remaining.
4715 if (dev->reg_state == NETREG_UNINITIALIZED) {
4716 pr_debug("unregister_netdevice: device %s/%p never "
4717 "was registered\n", dev->name, dev);
4720 list_del(&dev->unreg_list);
4724 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4726 /* If device is running, close it first. */
4729 /* And unlink it from device chain. */
4730 unlist_netdevice(dev);
4732 dev->reg_state = NETREG_UNREGISTERING;
4737 list_for_each_entry(dev, head, unreg_list) {
4738 /* Shutdown queueing discipline. */
4742 /* Notify protocols, that we are about to destroy
4743 this device. They should clean all the things.
4745 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4747 if (!dev->rtnl_link_ops ||
4748 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4749 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4752 * Flush the unicast and multicast chains
4757 if (dev->netdev_ops->ndo_uninit)
4758 dev->netdev_ops->ndo_uninit(dev);
4760 /* Notifier chain MUST detach us from master device. */
4761 WARN_ON(dev->master);
4763 /* Remove entries from kobject tree */
4764 netdev_unregister_kobject(dev);
4767 /* Process any work delayed until the end of the batch */
4768 dev = list_first_entry(head, struct net_device, unreg_list);
4769 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4773 list_for_each_entry(dev, head, unreg_list)
4777 static void rollback_registered(struct net_device *dev)
4781 list_add(&dev->unreg_list, &single);
4782 rollback_registered_many(&single);
4785 static void __netdev_init_queue_locks_one(struct net_device *dev,
4786 struct netdev_queue *dev_queue,
4789 spin_lock_init(&dev_queue->_xmit_lock);
4790 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4791 dev_queue->xmit_lock_owner = -1;
4794 static void netdev_init_queue_locks(struct net_device *dev)
4796 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4797 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4800 unsigned long netdev_fix_features(unsigned long features, const char *name)
4802 /* Fix illegal SG+CSUM combinations. */
4803 if ((features & NETIF_F_SG) &&
4804 !(features & NETIF_F_ALL_CSUM)) {
4806 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4807 "checksum feature.\n", name);
4808 features &= ~NETIF_F_SG;
4811 /* TSO requires that SG is present as well. */
4812 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4814 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4815 "SG feature.\n", name);
4816 features &= ~NETIF_F_TSO;
4819 if (features & NETIF_F_UFO) {
4820 if (!(features & NETIF_F_GEN_CSUM)) {
4822 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4823 "since no NETIF_F_HW_CSUM feature.\n",
4825 features &= ~NETIF_F_UFO;
4828 if (!(features & NETIF_F_SG)) {
4830 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4831 "since no NETIF_F_SG feature.\n", name);
4832 features &= ~NETIF_F_UFO;
4838 EXPORT_SYMBOL(netdev_fix_features);
4841 * netif_stacked_transfer_operstate - transfer operstate
4842 * @rootdev: the root or lower level device to transfer state from
4843 * @dev: the device to transfer operstate to
4845 * Transfer operational state from root to device. This is normally
4846 * called when a stacking relationship exists between the root
4847 * device and the device(a leaf device).
4849 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4850 struct net_device *dev)
4852 if (rootdev->operstate == IF_OPER_DORMANT)
4853 netif_dormant_on(dev);
4855 netif_dormant_off(dev);
4857 if (netif_carrier_ok(rootdev)) {
4858 if (!netif_carrier_ok(dev))
4859 netif_carrier_on(dev);
4861 if (netif_carrier_ok(dev))
4862 netif_carrier_off(dev);
4865 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4868 * register_netdevice - register a network device
4869 * @dev: device to register
4871 * Take a completed network device structure and add it to the kernel
4872 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4873 * chain. 0 is returned on success. A negative errno code is returned
4874 * on a failure to set up the device, or if the name is a duplicate.
4876 * Callers must hold the rtnl semaphore. You may want
4877 * register_netdev() instead of this.
4880 * The locking appears insufficient to guarantee two parallel registers
4881 * will not get the same name.
4884 int register_netdevice(struct net_device *dev)
4887 struct net *net = dev_net(dev);
4889 BUG_ON(dev_boot_phase);
4894 /* When net_device's are persistent, this will be fatal. */
4895 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4898 spin_lock_init(&dev->addr_list_lock);
4899 netdev_set_addr_lockdep_class(dev);
4900 netdev_init_queue_locks(dev);
4905 if (!dev->num_rx_queues) {
4907 * Allocate a single RX queue if driver never called
4911 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
4917 dev->_rx->first = dev->_rx;
4918 atomic_set(&dev->_rx->count, 1);
4919 dev->num_rx_queues = 1;
4922 /* Init, if this function is available */
4923 if (dev->netdev_ops->ndo_init) {
4924 ret = dev->netdev_ops->ndo_init(dev);
4932 ret = dev_get_valid_name(net, dev->name, dev->name, 0);
4936 dev->ifindex = dev_new_index(net);
4937 if (dev->iflink == -1)
4938 dev->iflink = dev->ifindex;
4940 /* Fix illegal checksum combinations */
4941 if ((dev->features & NETIF_F_HW_CSUM) &&
4942 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4943 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4945 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4948 if ((dev->features & NETIF_F_NO_CSUM) &&
4949 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4950 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4952 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4955 dev->features = netdev_fix_features(dev->features, dev->name);
4957 /* Enable software GSO if SG is supported. */
4958 if (dev->features & NETIF_F_SG)
4959 dev->features |= NETIF_F_GSO;
4961 netdev_initialize_kobject(dev);
4963 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
4964 ret = notifier_to_errno(ret);
4968 ret = netdev_register_kobject(dev);
4971 dev->reg_state = NETREG_REGISTERED;
4974 * Default initial state at registry is that the
4975 * device is present.
4978 set_bit(__LINK_STATE_PRESENT, &dev->state);
4980 dev_init_scheduler(dev);
4982 list_netdevice(dev);
4984 /* Notify protocols, that a new device appeared. */
4985 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4986 ret = notifier_to_errno(ret);
4988 rollback_registered(dev);
4989 dev->reg_state = NETREG_UNREGISTERED;
4992 * Prevent userspace races by waiting until the network
4993 * device is fully setup before sending notifications.
4995 if (!dev->rtnl_link_ops ||
4996 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4997 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5003 if (dev->netdev_ops->ndo_uninit)
5004 dev->netdev_ops->ndo_uninit(dev);
5007 EXPORT_SYMBOL(register_netdevice);
5010 * init_dummy_netdev - init a dummy network device for NAPI
5011 * @dev: device to init
5013 * This takes a network device structure and initialize the minimum
5014 * amount of fields so it can be used to schedule NAPI polls without
5015 * registering a full blown interface. This is to be used by drivers
5016 * that need to tie several hardware interfaces to a single NAPI
5017 * poll scheduler due to HW limitations.
5019 int init_dummy_netdev(struct net_device *dev)
5021 /* Clear everything. Note we don't initialize spinlocks
5022 * are they aren't supposed to be taken by any of the
5023 * NAPI code and this dummy netdev is supposed to be
5024 * only ever used for NAPI polls
5026 memset(dev, 0, sizeof(struct net_device));
5028 /* make sure we BUG if trying to hit standard
5029 * register/unregister code path
5031 dev->reg_state = NETREG_DUMMY;
5033 /* initialize the ref count */
5034 atomic_set(&dev->refcnt, 1);
5036 /* NAPI wants this */
5037 INIT_LIST_HEAD(&dev->napi_list);
5039 /* a dummy interface is started by default */
5040 set_bit(__LINK_STATE_PRESENT, &dev->state);
5041 set_bit(__LINK_STATE_START, &dev->state);
5045 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5049 * register_netdev - register a network device
5050 * @dev: device to register
5052 * Take a completed network device structure and add it to the kernel
5053 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5054 * chain. 0 is returned on success. A negative errno code is returned
5055 * on a failure to set up the device, or if the name is a duplicate.
5057 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5058 * and expands the device name if you passed a format string to
5061 int register_netdev(struct net_device *dev)
5068 * If the name is a format string the caller wants us to do a
5071 if (strchr(dev->name, '%')) {
5072 err = dev_alloc_name(dev, dev->name);
5077 err = register_netdevice(dev);
5082 EXPORT_SYMBOL(register_netdev);
5085 * netdev_wait_allrefs - wait until all references are gone.
5087 * This is called when unregistering network devices.
5089 * Any protocol or device that holds a reference should register
5090 * for netdevice notification, and cleanup and put back the
5091 * reference if they receive an UNREGISTER event.
5092 * We can get stuck here if buggy protocols don't correctly
5095 static void netdev_wait_allrefs(struct net_device *dev)
5097 unsigned long rebroadcast_time, warning_time;
5099 linkwatch_forget_dev(dev);
5101 rebroadcast_time = warning_time = jiffies;
5102 while (atomic_read(&dev->refcnt) != 0) {
5103 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5106 /* Rebroadcast unregister notification */
5107 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5108 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5109 * should have already handle it the first time */
5111 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5113 /* We must not have linkwatch events
5114 * pending on unregister. If this
5115 * happens, we simply run the queue
5116 * unscheduled, resulting in a noop
5119 linkwatch_run_queue();
5124 rebroadcast_time = jiffies;
5129 if (time_after(jiffies, warning_time + 10 * HZ)) {
5130 printk(KERN_EMERG "unregister_netdevice: "
5131 "waiting for %s to become free. Usage "
5133 dev->name, atomic_read(&dev->refcnt));
5134 warning_time = jiffies;
5143 * register_netdevice(x1);
5144 * register_netdevice(x2);
5146 * unregister_netdevice(y1);
5147 * unregister_netdevice(y2);
5153 * We are invoked by rtnl_unlock().
5154 * This allows us to deal with problems:
5155 * 1) We can delete sysfs objects which invoke hotplug
5156 * without deadlocking with linkwatch via keventd.
5157 * 2) Since we run with the RTNL semaphore not held, we can sleep
5158 * safely in order to wait for the netdev refcnt to drop to zero.
5160 * We must not return until all unregister events added during
5161 * the interval the lock was held have been completed.
5163 void netdev_run_todo(void)
5165 struct list_head list;
5167 /* Snapshot list, allow later requests */
5168 list_replace_init(&net_todo_list, &list);
5172 while (!list_empty(&list)) {
5173 struct net_device *dev
5174 = list_first_entry(&list, struct net_device, todo_list);
5175 list_del(&dev->todo_list);
5177 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5178 printk(KERN_ERR "network todo '%s' but state %d\n",
5179 dev->name, dev->reg_state);
5184 dev->reg_state = NETREG_UNREGISTERED;
5186 on_each_cpu(flush_backlog, dev, 1);
5188 netdev_wait_allrefs(dev);
5191 BUG_ON(atomic_read(&dev->refcnt));
5192 WARN_ON(dev->ip_ptr);
5193 WARN_ON(dev->ip6_ptr);
5194 WARN_ON(dev->dn_ptr);
5196 if (dev->destructor)
5197 dev->destructor(dev);
5199 /* Free network device */
5200 kobject_put(&dev->dev.kobj);
5205 * dev_txq_stats_fold - fold tx_queues stats
5206 * @dev: device to get statistics from
5207 * @stats: struct net_device_stats to hold results
5209 void dev_txq_stats_fold(const struct net_device *dev,
5210 struct net_device_stats *stats)
5212 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5214 struct netdev_queue *txq;
5216 for (i = 0; i < dev->num_tx_queues; i++) {
5217 txq = netdev_get_tx_queue(dev, i);
5218 tx_bytes += txq->tx_bytes;
5219 tx_packets += txq->tx_packets;
5220 tx_dropped += txq->tx_dropped;
5222 if (tx_bytes || tx_packets || tx_dropped) {
5223 stats->tx_bytes = tx_bytes;
5224 stats->tx_packets = tx_packets;
5225 stats->tx_dropped = tx_dropped;
5228 EXPORT_SYMBOL(dev_txq_stats_fold);
5231 * dev_get_stats - get network device statistics
5232 * @dev: device to get statistics from
5234 * Get network statistics from device. The device driver may provide
5235 * its own method by setting dev->netdev_ops->get_stats; otherwise
5236 * the internal statistics structure is used.
5238 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5240 const struct net_device_ops *ops = dev->netdev_ops;
5242 if (ops->ndo_get_stats)
5243 return ops->ndo_get_stats(dev);
5245 dev_txq_stats_fold(dev, &dev->stats);
5248 EXPORT_SYMBOL(dev_get_stats);
5250 static void netdev_init_one_queue(struct net_device *dev,
5251 struct netdev_queue *queue,
5257 static void netdev_init_queues(struct net_device *dev)
5259 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5260 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5261 spin_lock_init(&dev->tx_global_lock);
5265 * alloc_netdev_mq - allocate network device
5266 * @sizeof_priv: size of private data to allocate space for
5267 * @name: device name format string
5268 * @setup: callback to initialize device
5269 * @queue_count: the number of subqueues to allocate
5271 * Allocates a struct net_device with private data area for driver use
5272 * and performs basic initialization. Also allocates subquue structs
5273 * for each queue on the device at the end of the netdevice.
5275 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5276 void (*setup)(struct net_device *), unsigned int queue_count)
5278 struct netdev_queue *tx;
5279 struct net_device *dev;
5281 struct net_device *p;
5283 struct netdev_rx_queue *rx;
5287 BUG_ON(strlen(name) >= sizeof(dev->name));
5289 alloc_size = sizeof(struct net_device);
5291 /* ensure 32-byte alignment of private area */
5292 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5293 alloc_size += sizeof_priv;
5295 /* ensure 32-byte alignment of whole construct */
5296 alloc_size += NETDEV_ALIGN - 1;
5298 p = kzalloc(alloc_size, GFP_KERNEL);
5300 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5304 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5306 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5312 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5314 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5319 atomic_set(&rx->count, queue_count);
5322 * Set a pointer to first element in the array which holds the
5325 for (i = 0; i < queue_count; i++)
5329 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5330 dev->padded = (char *)dev - (char *)p;
5332 if (dev_addr_init(dev))
5338 dev_net_set(dev, &init_net);
5341 dev->num_tx_queues = queue_count;
5342 dev->real_num_tx_queues = queue_count;
5346 dev->num_rx_queues = queue_count;
5349 dev->gso_max_size = GSO_MAX_SIZE;
5351 netdev_init_queues(dev);
5353 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5354 dev->ethtool_ntuple_list.count = 0;
5355 INIT_LIST_HEAD(&dev->napi_list);
5356 INIT_LIST_HEAD(&dev->unreg_list);
5357 INIT_LIST_HEAD(&dev->link_watch_list);
5358 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5360 strcpy(dev->name, name);
5373 EXPORT_SYMBOL(alloc_netdev_mq);
5376 * free_netdev - free network device
5379 * This function does the last stage of destroying an allocated device
5380 * interface. The reference to the device object is released.
5381 * If this is the last reference then it will be freed.
5383 void free_netdev(struct net_device *dev)
5385 struct napi_struct *p, *n;
5387 release_net(dev_net(dev));
5391 /* Flush device addresses */
5392 dev_addr_flush(dev);
5394 /* Clear ethtool n-tuple list */
5395 ethtool_ntuple_flush(dev);
5397 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5400 /* Compatibility with error handling in drivers */
5401 if (dev->reg_state == NETREG_UNINITIALIZED) {
5402 kfree((char *)dev - dev->padded);
5406 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5407 dev->reg_state = NETREG_RELEASED;
5409 /* will free via device release */
5410 put_device(&dev->dev);
5412 EXPORT_SYMBOL(free_netdev);
5415 * synchronize_net - Synchronize with packet receive processing
5417 * Wait for packets currently being received to be done.
5418 * Does not block later packets from starting.
5420 void synchronize_net(void)
5425 EXPORT_SYMBOL(synchronize_net);
5428 * unregister_netdevice_queue - remove device from the kernel
5432 * This function shuts down a device interface and removes it
5433 * from the kernel tables.
5434 * If head not NULL, device is queued to be unregistered later.
5436 * Callers must hold the rtnl semaphore. You may want
5437 * unregister_netdev() instead of this.
5440 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5445 list_move_tail(&dev->unreg_list, head);
5447 rollback_registered(dev);
5448 /* Finish processing unregister after unlock */
5452 EXPORT_SYMBOL(unregister_netdevice_queue);
5455 * unregister_netdevice_many - unregister many devices
5456 * @head: list of devices
5458 void unregister_netdevice_many(struct list_head *head)
5460 struct net_device *dev;
5462 if (!list_empty(head)) {
5463 rollback_registered_many(head);
5464 list_for_each_entry(dev, head, unreg_list)
5468 EXPORT_SYMBOL(unregister_netdevice_many);
5471 * unregister_netdev - remove device from the kernel
5474 * This function shuts down a device interface and removes it
5475 * from the kernel tables.
5477 * This is just a wrapper for unregister_netdevice that takes
5478 * the rtnl semaphore. In general you want to use this and not
5479 * unregister_netdevice.
5481 void unregister_netdev(struct net_device *dev)
5484 unregister_netdevice(dev);
5487 EXPORT_SYMBOL(unregister_netdev);
5490 * dev_change_net_namespace - move device to different nethost namespace
5492 * @net: network namespace
5493 * @pat: If not NULL name pattern to try if the current device name
5494 * is already taken in the destination network namespace.
5496 * This function shuts down a device interface and moves it
5497 * to a new network namespace. On success 0 is returned, on
5498 * a failure a netagive errno code is returned.
5500 * Callers must hold the rtnl semaphore.
5503 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5509 /* Don't allow namespace local devices to be moved. */
5511 if (dev->features & NETIF_F_NETNS_LOCAL)
5515 /* Don't allow real devices to be moved when sysfs
5519 if (dev->dev.parent)
5523 /* Ensure the device has been registrered */
5525 if (dev->reg_state != NETREG_REGISTERED)
5528 /* Get out if there is nothing todo */
5530 if (net_eq(dev_net(dev), net))
5533 /* Pick the destination device name, and ensure
5534 * we can use it in the destination network namespace.
5537 if (__dev_get_by_name(net, dev->name)) {
5538 /* We get here if we can't use the current device name */
5541 if (dev_get_valid_name(net, pat, dev->name, 1))
5546 * And now a mini version of register_netdevice unregister_netdevice.
5549 /* If device is running close it first. */
5552 /* And unlink it from device chain */
5554 unlist_netdevice(dev);
5558 /* Shutdown queueing discipline. */
5561 /* Notify protocols, that we are about to destroy
5562 this device. They should clean all the things.
5564 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5565 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5568 * Flush the unicast and multicast chains
5573 netdev_unregister_kobject(dev);
5575 /* Actually switch the network namespace */
5576 dev_net_set(dev, net);
5578 /* If there is an ifindex conflict assign a new one */
5579 if (__dev_get_by_index(net, dev->ifindex)) {
5580 int iflink = (dev->iflink == dev->ifindex);
5581 dev->ifindex = dev_new_index(net);
5583 dev->iflink = dev->ifindex;
5586 /* Fixup kobjects */
5587 err = netdev_register_kobject(dev);
5590 /* Add the device back in the hashes */
5591 list_netdevice(dev);
5593 /* Notify protocols, that a new device appeared. */
5594 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5597 * Prevent userspace races by waiting until the network
5598 * device is fully setup before sending notifications.
5600 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5607 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5609 static int dev_cpu_callback(struct notifier_block *nfb,
5610 unsigned long action,
5613 struct sk_buff **list_skb;
5614 struct sk_buff *skb;
5615 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5616 struct softnet_data *sd, *oldsd;
5618 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5621 local_irq_disable();
5622 cpu = smp_processor_id();
5623 sd = &per_cpu(softnet_data, cpu);
5624 oldsd = &per_cpu(softnet_data, oldcpu);
5626 /* Find end of our completion_queue. */
5627 list_skb = &sd->completion_queue;
5629 list_skb = &(*list_skb)->next;
5630 /* Append completion queue from offline CPU. */
5631 *list_skb = oldsd->completion_queue;
5632 oldsd->completion_queue = NULL;
5634 /* Append output queue from offline CPU. */
5635 if (oldsd->output_queue) {
5636 *sd->output_queue_tailp = oldsd->output_queue;
5637 sd->output_queue_tailp = oldsd->output_queue_tailp;
5638 oldsd->output_queue = NULL;
5639 oldsd->output_queue_tailp = &oldsd->output_queue;
5642 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5645 /* Process offline CPU's input_pkt_queue */
5646 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5648 input_queue_head_add(oldsd, 1);
5650 while ((skb = __skb_dequeue(&oldsd->process_queue)))
5658 * netdev_increment_features - increment feature set by one
5659 * @all: current feature set
5660 * @one: new feature set
5661 * @mask: mask feature set
5663 * Computes a new feature set after adding a device with feature set
5664 * @one to the master device with current feature set @all. Will not
5665 * enable anything that is off in @mask. Returns the new feature set.
5667 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5670 /* If device needs checksumming, downgrade to it. */
5671 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5672 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5673 else if (mask & NETIF_F_ALL_CSUM) {
5674 /* If one device supports v4/v6 checksumming, set for all. */
5675 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5676 !(all & NETIF_F_GEN_CSUM)) {
5677 all &= ~NETIF_F_ALL_CSUM;
5678 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5681 /* If one device supports hw checksumming, set for all. */
5682 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5683 all &= ~NETIF_F_ALL_CSUM;
5684 all |= NETIF_F_HW_CSUM;
5688 one |= NETIF_F_ALL_CSUM;
5690 one |= all & NETIF_F_ONE_FOR_ALL;
5691 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5692 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5696 EXPORT_SYMBOL(netdev_increment_features);
5698 static struct hlist_head *netdev_create_hash(void)
5701 struct hlist_head *hash;
5703 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5705 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5706 INIT_HLIST_HEAD(&hash[i]);
5711 /* Initialize per network namespace state */
5712 static int __net_init netdev_init(struct net *net)
5714 INIT_LIST_HEAD(&net->dev_base_head);
5716 net->dev_name_head = netdev_create_hash();
5717 if (net->dev_name_head == NULL)
5720 net->dev_index_head = netdev_create_hash();
5721 if (net->dev_index_head == NULL)
5727 kfree(net->dev_name_head);
5733 * netdev_drivername - network driver for the device
5734 * @dev: network device
5735 * @buffer: buffer for resulting name
5736 * @len: size of buffer
5738 * Determine network driver for device.
5740 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5742 const struct device_driver *driver;
5743 const struct device *parent;
5745 if (len <= 0 || !buffer)
5749 parent = dev->dev.parent;
5754 driver = parent->driver;
5755 if (driver && driver->name)
5756 strlcpy(buffer, driver->name, len);
5760 static void __net_exit netdev_exit(struct net *net)
5762 kfree(net->dev_name_head);
5763 kfree(net->dev_index_head);
5766 static struct pernet_operations __net_initdata netdev_net_ops = {
5767 .init = netdev_init,
5768 .exit = netdev_exit,
5771 static void __net_exit default_device_exit(struct net *net)
5773 struct net_device *dev, *aux;
5775 * Push all migratable network devices back to the
5776 * initial network namespace
5779 for_each_netdev_safe(net, dev, aux) {
5781 char fb_name[IFNAMSIZ];
5783 /* Ignore unmoveable devices (i.e. loopback) */
5784 if (dev->features & NETIF_F_NETNS_LOCAL)
5787 /* Leave virtual devices for the generic cleanup */
5788 if (dev->rtnl_link_ops)
5791 /* Push remaing network devices to init_net */
5792 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5793 err = dev_change_net_namespace(dev, &init_net, fb_name);
5795 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5796 __func__, dev->name, err);
5803 static void __net_exit default_device_exit_batch(struct list_head *net_list)
5805 /* At exit all network devices most be removed from a network
5806 * namespace. Do this in the reverse order of registeration.
5807 * Do this across as many network namespaces as possible to
5808 * improve batching efficiency.
5810 struct net_device *dev;
5812 LIST_HEAD(dev_kill_list);
5815 list_for_each_entry(net, net_list, exit_list) {
5816 for_each_netdev_reverse(net, dev) {
5817 if (dev->rtnl_link_ops)
5818 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
5820 unregister_netdevice_queue(dev, &dev_kill_list);
5823 unregister_netdevice_many(&dev_kill_list);
5827 static struct pernet_operations __net_initdata default_device_ops = {
5828 .exit = default_device_exit,
5829 .exit_batch = default_device_exit_batch,
5833 * Initialize the DEV module. At boot time this walks the device list and
5834 * unhooks any devices that fail to initialise (normally hardware not
5835 * present) and leaves us with a valid list of present and active devices.
5840 * This is called single threaded during boot, so no need
5841 * to take the rtnl semaphore.
5843 static int __init net_dev_init(void)
5845 int i, rc = -ENOMEM;
5847 BUG_ON(!dev_boot_phase);
5849 if (dev_proc_init())
5852 if (netdev_kobject_init())
5855 INIT_LIST_HEAD(&ptype_all);
5856 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5857 INIT_LIST_HEAD(&ptype_base[i]);
5859 if (register_pernet_subsys(&netdev_net_ops))
5863 * Initialise the packet receive queues.
5866 for_each_possible_cpu(i) {
5867 struct softnet_data *sd = &per_cpu(softnet_data, i);
5869 memset(sd, 0, sizeof(*sd));
5870 skb_queue_head_init(&sd->input_pkt_queue);
5871 skb_queue_head_init(&sd->process_queue);
5872 sd->completion_queue = NULL;
5873 INIT_LIST_HEAD(&sd->poll_list);
5874 sd->output_queue = NULL;
5875 sd->output_queue_tailp = &sd->output_queue;
5877 sd->csd.func = rps_trigger_softirq;
5883 sd->backlog.poll = process_backlog;
5884 sd->backlog.weight = weight_p;
5885 sd->backlog.gro_list = NULL;
5886 sd->backlog.gro_count = 0;
5891 /* The loopback device is special if any other network devices
5892 * is present in a network namespace the loopback device must
5893 * be present. Since we now dynamically allocate and free the
5894 * loopback device ensure this invariant is maintained by
5895 * keeping the loopback device as the first device on the
5896 * list of network devices. Ensuring the loopback devices
5897 * is the first device that appears and the last network device
5900 if (register_pernet_device(&loopback_net_ops))
5903 if (register_pernet_device(&default_device_ops))
5906 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5907 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5909 hotcpu_notifier(dev_cpu_callback, 0);
5917 subsys_initcall(net_dev_init);
5919 static int __init initialize_hashrnd(void)
5921 get_random_bytes(&hashrnd, sizeof(hashrnd));
5925 late_initcall_sync(initialize_hashrnd);