2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
104 #include <linux/if_bridge.h>
105 #include <linux/if_macvlan.h>
107 #include <net/pkt_sched.h>
108 #include <net/checksum.h>
109 #include <net/xfrm.h>
110 #include <linux/highmem.h>
111 #include <linux/init.h>
112 #include <linux/kmod.h>
113 #include <linux/module.h>
114 #include <linux/netpoll.h>
115 #include <linux/rcupdate.h>
116 #include <linux/delay.h>
117 #include <net/wext.h>
118 #include <net/iw_handler.h>
119 #include <asm/current.h>
120 #include <linux/audit.h>
121 #include <linux/dmaengine.h>
122 #include <linux/err.h>
123 #include <linux/ctype.h>
124 #include <linux/if_arp.h>
125 #include <linux/if_vlan.h>
126 #include <linux/ip.h>
128 #include <linux/ipv6.h>
129 #include <linux/in.h>
130 #include <linux/jhash.h>
131 #include <linux/random.h>
132 #include <trace/events/napi.h>
133 #include <linux/pci.h>
135 #include "net-sysfs.h"
137 /* Instead of increasing this, you should create a hash table. */
138 #define MAX_GRO_SKBS 8
140 /* This should be increased if a protocol with a bigger head is added. */
141 #define GRO_MAX_HEAD (MAX_HEADER + 128)
144 * The list of packet types we will receive (as opposed to discard)
145 * and the routines to invoke.
147 * Why 16. Because with 16 the only overlap we get on a hash of the
148 * low nibble of the protocol value is RARP/SNAP/X.25.
150 * NOTE: That is no longer true with the addition of VLAN tags. Not
151 * sure which should go first, but I bet it won't make much
152 * difference if we are running VLANs. The good news is that
153 * this protocol won't be in the list unless compiled in, so
154 * the average user (w/out VLANs) will not be adversely affected.
171 #define PTYPE_HASH_SIZE (16)
172 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
174 static DEFINE_SPINLOCK(ptype_lock);
175 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
176 static struct list_head ptype_all __read_mostly; /* Taps */
179 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
182 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
184 * Writers must hold the rtnl semaphore while they loop through the
185 * dev_base_head list, and hold dev_base_lock for writing when they do the
186 * actual updates. This allows pure readers to access the list even
187 * while a writer is preparing to update it.
189 * To put it another way, dev_base_lock is held for writing only to
190 * protect against pure readers; the rtnl semaphore provides the
191 * protection against other writers.
193 * See, for example usages, register_netdevice() and
194 * unregister_netdevice(), which must be called with the rtnl
197 DEFINE_RWLOCK(dev_base_lock);
198 EXPORT_SYMBOL(dev_base_lock);
200 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
202 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
203 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
206 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
208 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
211 static inline void rps_lock(struct softnet_data *sd)
214 spin_lock(&sd->input_pkt_queue.lock);
218 static inline void rps_unlock(struct softnet_data *sd)
221 spin_unlock(&sd->input_pkt_queue.lock);
225 /* Device list insertion */
226 static int list_netdevice(struct net_device *dev)
228 struct net *net = dev_net(dev);
232 write_lock_bh(&dev_base_lock);
233 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
234 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
235 hlist_add_head_rcu(&dev->index_hlist,
236 dev_index_hash(net, dev->ifindex));
237 write_unlock_bh(&dev_base_lock);
241 /* Device list removal
242 * caller must respect a RCU grace period before freeing/reusing dev
244 static void unlist_netdevice(struct net_device *dev)
248 /* Unlink dev from the device chain */
249 write_lock_bh(&dev_base_lock);
250 list_del_rcu(&dev->dev_list);
251 hlist_del_rcu(&dev->name_hlist);
252 hlist_del_rcu(&dev->index_hlist);
253 write_unlock_bh(&dev_base_lock);
260 static RAW_NOTIFIER_HEAD(netdev_chain);
263 * Device drivers call our routines to queue packets here. We empty the
264 * queue in the local softnet handler.
267 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
268 EXPORT_PER_CPU_SYMBOL(softnet_data);
270 #ifdef CONFIG_LOCKDEP
272 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
273 * according to dev->type
275 static const unsigned short netdev_lock_type[] =
276 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
277 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
278 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
279 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
280 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
281 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
282 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
283 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
284 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
285 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
286 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
287 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
288 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
289 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
290 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
291 ARPHRD_VOID, ARPHRD_NONE};
293 static const char *const netdev_lock_name[] =
294 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
295 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
296 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
297 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
298 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
299 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
300 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
301 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
302 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
303 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
304 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
305 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
306 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
307 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
308 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
309 "_xmit_VOID", "_xmit_NONE"};
311 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
312 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
314 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
318 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
319 if (netdev_lock_type[i] == dev_type)
321 /* the last key is used by default */
322 return ARRAY_SIZE(netdev_lock_type) - 1;
325 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
326 unsigned short dev_type)
330 i = netdev_lock_pos(dev_type);
331 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
332 netdev_lock_name[i]);
335 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
339 i = netdev_lock_pos(dev->type);
340 lockdep_set_class_and_name(&dev->addr_list_lock,
341 &netdev_addr_lock_key[i],
342 netdev_lock_name[i]);
345 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
346 unsigned short dev_type)
349 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
354 /*******************************************************************************
356 Protocol management and registration routines
358 *******************************************************************************/
361 * Add a protocol ID to the list. Now that the input handler is
362 * smarter we can dispense with all the messy stuff that used to be
365 * BEWARE!!! Protocol handlers, mangling input packets,
366 * MUST BE last in hash buckets and checking protocol handlers
367 * MUST start from promiscuous ptype_all chain in net_bh.
368 * It is true now, do not change it.
369 * Explanation follows: if protocol handler, mangling packet, will
370 * be the first on list, it is not able to sense, that packet
371 * is cloned and should be copied-on-write, so that it will
372 * change it and subsequent readers will get broken packet.
377 * dev_add_pack - add packet handler
378 * @pt: packet type declaration
380 * Add a protocol handler to the networking stack. The passed &packet_type
381 * is linked into kernel lists and may not be freed until it has been
382 * removed from the kernel lists.
384 * This call does not sleep therefore it can not
385 * guarantee all CPU's that are in middle of receiving packets
386 * will see the new packet type (until the next received packet).
389 void dev_add_pack(struct packet_type *pt)
393 spin_lock_bh(&ptype_lock);
394 if (pt->type == htons(ETH_P_ALL))
395 list_add_rcu(&pt->list, &ptype_all);
397 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
398 list_add_rcu(&pt->list, &ptype_base[hash]);
400 spin_unlock_bh(&ptype_lock);
402 EXPORT_SYMBOL(dev_add_pack);
405 * __dev_remove_pack - remove packet handler
406 * @pt: packet type declaration
408 * Remove a protocol handler that was previously added to the kernel
409 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
410 * from the kernel lists and can be freed or reused once this function
413 * The packet type might still be in use by receivers
414 * and must not be freed until after all the CPU's have gone
415 * through a quiescent state.
417 void __dev_remove_pack(struct packet_type *pt)
419 struct list_head *head;
420 struct packet_type *pt1;
422 spin_lock_bh(&ptype_lock);
424 if (pt->type == htons(ETH_P_ALL))
427 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
429 list_for_each_entry(pt1, head, list) {
431 list_del_rcu(&pt->list);
436 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
438 spin_unlock_bh(&ptype_lock);
440 EXPORT_SYMBOL(__dev_remove_pack);
443 * dev_remove_pack - remove packet handler
444 * @pt: packet type declaration
446 * Remove a protocol handler that was previously added to the kernel
447 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
448 * from the kernel lists and can be freed or reused once this function
451 * This call sleeps to guarantee that no CPU is looking at the packet
454 void dev_remove_pack(struct packet_type *pt)
456 __dev_remove_pack(pt);
460 EXPORT_SYMBOL(dev_remove_pack);
462 /******************************************************************************
464 Device Boot-time Settings Routines
466 *******************************************************************************/
468 /* Boot time configuration table */
469 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
472 * netdev_boot_setup_add - add new setup entry
473 * @name: name of the device
474 * @map: configured settings for the device
476 * Adds new setup entry to the dev_boot_setup list. The function
477 * returns 0 on error and 1 on success. This is a generic routine to
480 static int netdev_boot_setup_add(char *name, struct ifmap *map)
482 struct netdev_boot_setup *s;
486 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
487 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
488 memset(s[i].name, 0, sizeof(s[i].name));
489 strlcpy(s[i].name, name, IFNAMSIZ);
490 memcpy(&s[i].map, map, sizeof(s[i].map));
495 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
499 * netdev_boot_setup_check - check boot time settings
500 * @dev: the netdevice
502 * Check boot time settings for the device.
503 * The found settings are set for the device to be used
504 * later in the device probing.
505 * Returns 0 if no settings found, 1 if they are.
507 int netdev_boot_setup_check(struct net_device *dev)
509 struct netdev_boot_setup *s = dev_boot_setup;
512 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
513 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
514 !strcmp(dev->name, s[i].name)) {
515 dev->irq = s[i].map.irq;
516 dev->base_addr = s[i].map.base_addr;
517 dev->mem_start = s[i].map.mem_start;
518 dev->mem_end = s[i].map.mem_end;
524 EXPORT_SYMBOL(netdev_boot_setup_check);
528 * netdev_boot_base - get address from boot time settings
529 * @prefix: prefix for network device
530 * @unit: id for network device
532 * Check boot time settings for the base address of device.
533 * The found settings are set for the device to be used
534 * later in the device probing.
535 * Returns 0 if no settings found.
537 unsigned long netdev_boot_base(const char *prefix, int unit)
539 const struct netdev_boot_setup *s = dev_boot_setup;
543 sprintf(name, "%s%d", prefix, unit);
546 * If device already registered then return base of 1
547 * to indicate not to probe for this interface
549 if (__dev_get_by_name(&init_net, name))
552 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
553 if (!strcmp(name, s[i].name))
554 return s[i].map.base_addr;
559 * Saves at boot time configured settings for any netdevice.
561 int __init netdev_boot_setup(char *str)
566 str = get_options(str, ARRAY_SIZE(ints), ints);
571 memset(&map, 0, sizeof(map));
575 map.base_addr = ints[2];
577 map.mem_start = ints[3];
579 map.mem_end = ints[4];
581 /* Add new entry to the list */
582 return netdev_boot_setup_add(str, &map);
585 __setup("netdev=", netdev_boot_setup);
587 /*******************************************************************************
589 Device Interface Subroutines
591 *******************************************************************************/
594 * __dev_get_by_name - find a device by its name
595 * @net: the applicable net namespace
596 * @name: name to find
598 * Find an interface by name. Must be called under RTNL semaphore
599 * or @dev_base_lock. If the name is found a pointer to the device
600 * is returned. If the name is not found then %NULL is returned. The
601 * reference counters are not incremented so the caller must be
602 * careful with locks.
605 struct net_device *__dev_get_by_name(struct net *net, const char *name)
607 struct hlist_node *p;
608 struct net_device *dev;
609 struct hlist_head *head = dev_name_hash(net, name);
611 hlist_for_each_entry(dev, p, head, name_hlist)
612 if (!strncmp(dev->name, name, IFNAMSIZ))
617 EXPORT_SYMBOL(__dev_get_by_name);
620 * dev_get_by_name_rcu - find a device by its name
621 * @net: the applicable net namespace
622 * @name: name to find
624 * Find an interface by name.
625 * If the name is found a pointer to the device is returned.
626 * If the name is not found then %NULL is returned.
627 * The reference counters are not incremented so the caller must be
628 * careful with locks. The caller must hold RCU lock.
631 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
633 struct hlist_node *p;
634 struct net_device *dev;
635 struct hlist_head *head = dev_name_hash(net, name);
637 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
638 if (!strncmp(dev->name, name, IFNAMSIZ))
643 EXPORT_SYMBOL(dev_get_by_name_rcu);
646 * dev_get_by_name - find a device by its name
647 * @net: the applicable net namespace
648 * @name: name to find
650 * Find an interface by name. This can be called from any
651 * context and does its own locking. The returned handle has
652 * the usage count incremented and the caller must use dev_put() to
653 * release it when it is no longer needed. %NULL is returned if no
654 * matching device is found.
657 struct net_device *dev_get_by_name(struct net *net, const char *name)
659 struct net_device *dev;
662 dev = dev_get_by_name_rcu(net, name);
668 EXPORT_SYMBOL(dev_get_by_name);
671 * __dev_get_by_index - find a device by its ifindex
672 * @net: the applicable net namespace
673 * @ifindex: index of device
675 * Search for an interface by index. Returns %NULL if the device
676 * is not found or a pointer to the device. The device has not
677 * had its reference counter increased so the caller must be careful
678 * about locking. The caller must hold either the RTNL semaphore
682 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
684 struct hlist_node *p;
685 struct net_device *dev;
686 struct hlist_head *head = dev_index_hash(net, ifindex);
688 hlist_for_each_entry(dev, p, head, index_hlist)
689 if (dev->ifindex == ifindex)
694 EXPORT_SYMBOL(__dev_get_by_index);
697 * dev_get_by_index_rcu - find a device by its ifindex
698 * @net: the applicable net namespace
699 * @ifindex: index of device
701 * Search for an interface by index. Returns %NULL if the device
702 * is not found or a pointer to the device. The device has not
703 * had its reference counter increased so the caller must be careful
704 * about locking. The caller must hold RCU lock.
707 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
709 struct hlist_node *p;
710 struct net_device *dev;
711 struct hlist_head *head = dev_index_hash(net, ifindex);
713 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
714 if (dev->ifindex == ifindex)
719 EXPORT_SYMBOL(dev_get_by_index_rcu);
723 * dev_get_by_index - find a device by its ifindex
724 * @net: the applicable net namespace
725 * @ifindex: index of device
727 * Search for an interface by index. Returns NULL if the device
728 * is not found or a pointer to the device. The device returned has
729 * had a reference added and the pointer is safe until the user calls
730 * dev_put to indicate they have finished with it.
733 struct net_device *dev_get_by_index(struct net *net, int ifindex)
735 struct net_device *dev;
738 dev = dev_get_by_index_rcu(net, ifindex);
744 EXPORT_SYMBOL(dev_get_by_index);
747 * dev_getbyhwaddr - find a device by its hardware address
748 * @net: the applicable net namespace
749 * @type: media type of device
750 * @ha: hardware address
752 * Search for an interface by MAC address. Returns NULL if the device
753 * is not found or a pointer to the device. The caller must hold the
754 * rtnl semaphore. The returned device has not had its ref count increased
755 * and the caller must therefore be careful about locking
758 * If the API was consistent this would be __dev_get_by_hwaddr
761 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
763 struct net_device *dev;
767 for_each_netdev(net, dev)
768 if (dev->type == type &&
769 !memcmp(dev->dev_addr, ha, dev->addr_len))
774 EXPORT_SYMBOL(dev_getbyhwaddr);
776 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
778 struct net_device *dev;
781 for_each_netdev(net, dev)
782 if (dev->type == type)
787 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
789 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
791 struct net_device *dev, *ret = NULL;
794 for_each_netdev_rcu(net, dev)
795 if (dev->type == type) {
803 EXPORT_SYMBOL(dev_getfirstbyhwtype);
806 * dev_get_by_flags - find any device with given flags
807 * @net: the applicable net namespace
808 * @if_flags: IFF_* values
809 * @mask: bitmask of bits in if_flags to check
811 * Search for any interface with the given flags. Returns NULL if a device
812 * is not found or a pointer to the device. The device returned has
813 * had a reference added and the pointer is safe until the user calls
814 * dev_put to indicate they have finished with it.
817 struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
820 struct net_device *dev, *ret;
824 for_each_netdev_rcu(net, dev) {
825 if (((dev->flags ^ if_flags) & mask) == 0) {
834 EXPORT_SYMBOL(dev_get_by_flags);
837 * dev_valid_name - check if name is okay for network device
840 * Network device names need to be valid file names to
841 * to allow sysfs to work. We also disallow any kind of
844 int dev_valid_name(const char *name)
848 if (strlen(name) >= IFNAMSIZ)
850 if (!strcmp(name, ".") || !strcmp(name, ".."))
854 if (*name == '/' || isspace(*name))
860 EXPORT_SYMBOL(dev_valid_name);
863 * __dev_alloc_name - allocate a name for a device
864 * @net: network namespace to allocate the device name in
865 * @name: name format string
866 * @buf: scratch buffer and result name string
868 * Passed a format string - eg "lt%d" it will try and find a suitable
869 * id. It scans list of devices to build up a free map, then chooses
870 * the first empty slot. The caller must hold the dev_base or rtnl lock
871 * while allocating the name and adding the device in order to avoid
873 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
874 * Returns the number of the unit assigned or a negative errno code.
877 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
881 const int max_netdevices = 8*PAGE_SIZE;
882 unsigned long *inuse;
883 struct net_device *d;
885 p = strnchr(name, IFNAMSIZ-1, '%');
888 * Verify the string as this thing may have come from
889 * the user. There must be either one "%d" and no other "%"
892 if (p[1] != 'd' || strchr(p + 2, '%'))
895 /* Use one page as a bit array of possible slots */
896 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
900 for_each_netdev(net, d) {
901 if (!sscanf(d->name, name, &i))
903 if (i < 0 || i >= max_netdevices)
906 /* avoid cases where sscanf is not exact inverse of printf */
907 snprintf(buf, IFNAMSIZ, name, i);
908 if (!strncmp(buf, d->name, IFNAMSIZ))
912 i = find_first_zero_bit(inuse, max_netdevices);
913 free_page((unsigned long) inuse);
917 snprintf(buf, IFNAMSIZ, name, i);
918 if (!__dev_get_by_name(net, buf))
921 /* It is possible to run out of possible slots
922 * when the name is long and there isn't enough space left
923 * for the digits, or if all bits are used.
929 * dev_alloc_name - allocate a name for a device
931 * @name: name format string
933 * Passed a format string - eg "lt%d" it will try and find a suitable
934 * id. It scans list of devices to build up a free map, then chooses
935 * the first empty slot. The caller must hold the dev_base or rtnl lock
936 * while allocating the name and adding the device in order to avoid
938 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
939 * Returns the number of the unit assigned or a negative errno code.
942 int dev_alloc_name(struct net_device *dev, const char *name)
948 BUG_ON(!dev_net(dev));
950 ret = __dev_alloc_name(net, name, buf);
952 strlcpy(dev->name, buf, IFNAMSIZ);
955 EXPORT_SYMBOL(dev_alloc_name);
957 static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt)
961 BUG_ON(!dev_net(dev));
964 if (!dev_valid_name(name))
967 if (fmt && strchr(name, '%'))
968 return dev_alloc_name(dev, name);
969 else if (__dev_get_by_name(net, name))
971 else if (dev->name != name)
972 strlcpy(dev->name, name, IFNAMSIZ);
978 * dev_change_name - change name of a device
980 * @newname: name (or format string) must be at least IFNAMSIZ
982 * Change name of a device, can pass format strings "eth%d".
985 int dev_change_name(struct net_device *dev, const char *newname)
987 char oldname[IFNAMSIZ];
993 BUG_ON(!dev_net(dev));
996 if (dev->flags & IFF_UP)
999 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
1002 memcpy(oldname, dev->name, IFNAMSIZ);
1004 err = dev_get_valid_name(dev, newname, 1);
1009 ret = device_rename(&dev->dev, dev->name);
1011 memcpy(dev->name, oldname, IFNAMSIZ);
1015 write_lock_bh(&dev_base_lock);
1016 hlist_del(&dev->name_hlist);
1017 write_unlock_bh(&dev_base_lock);
1021 write_lock_bh(&dev_base_lock);
1022 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1023 write_unlock_bh(&dev_base_lock);
1025 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1026 ret = notifier_to_errno(ret);
1029 /* err >= 0 after dev_alloc_name() or stores the first errno */
1032 memcpy(dev->name, oldname, IFNAMSIZ);
1036 "%s: name change rollback failed: %d.\n",
1045 * dev_set_alias - change ifalias of a device
1047 * @alias: name up to IFALIASZ
1048 * @len: limit of bytes to copy from info
1050 * Set ifalias for a device,
1052 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1056 if (len >= IFALIASZ)
1061 kfree(dev->ifalias);
1062 dev->ifalias = NULL;
1067 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1071 strlcpy(dev->ifalias, alias, len+1);
1077 * netdev_features_change - device changes features
1078 * @dev: device to cause notification
1080 * Called to indicate a device has changed features.
1082 void netdev_features_change(struct net_device *dev)
1084 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1086 EXPORT_SYMBOL(netdev_features_change);
1089 * netdev_state_change - device changes state
1090 * @dev: device to cause notification
1092 * Called to indicate a device has changed state. This function calls
1093 * the notifier chains for netdev_chain and sends a NEWLINK message
1094 * to the routing socket.
1096 void netdev_state_change(struct net_device *dev)
1098 if (dev->flags & IFF_UP) {
1099 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1100 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1103 EXPORT_SYMBOL(netdev_state_change);
1105 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1107 return call_netdevice_notifiers(event, dev);
1109 EXPORT_SYMBOL(netdev_bonding_change);
1112 * dev_load - load a network module
1113 * @net: the applicable net namespace
1114 * @name: name of interface
1116 * If a network interface is not present and the process has suitable
1117 * privileges this function loads the module. If module loading is not
1118 * available in this kernel then it becomes a nop.
1121 void dev_load(struct net *net, const char *name)
1123 struct net_device *dev;
1126 dev = dev_get_by_name_rcu(net, name);
1129 if (!dev && capable(CAP_NET_ADMIN))
1130 request_module("%s", name);
1132 EXPORT_SYMBOL(dev_load);
1134 static int __dev_open(struct net_device *dev)
1136 const struct net_device_ops *ops = dev->netdev_ops;
1142 * Is it even present?
1144 if (!netif_device_present(dev))
1147 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1148 ret = notifier_to_errno(ret);
1153 * Call device private open method
1155 set_bit(__LINK_STATE_START, &dev->state);
1157 if (ops->ndo_validate_addr)
1158 ret = ops->ndo_validate_addr(dev);
1160 if (!ret && ops->ndo_open)
1161 ret = ops->ndo_open(dev);
1164 * If it went open OK then:
1168 clear_bit(__LINK_STATE_START, &dev->state);
1173 dev->flags |= IFF_UP;
1178 net_dmaengine_get();
1181 * Initialize multicasting status
1183 dev_set_rx_mode(dev);
1186 * Wakeup transmit queue engine
1195 * dev_open - prepare an interface for use.
1196 * @dev: device to open
1198 * Takes a device from down to up state. The device's private open
1199 * function is invoked and then the multicast lists are loaded. Finally
1200 * the device is moved into the up state and a %NETDEV_UP message is
1201 * sent to the netdev notifier chain.
1203 * Calling this function on an active interface is a nop. On a failure
1204 * a negative errno code is returned.
1206 int dev_open(struct net_device *dev)
1213 if (dev->flags & IFF_UP)
1219 ret = __dev_open(dev);
1224 * ... and announce new interface.
1226 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1227 call_netdevice_notifiers(NETDEV_UP, dev);
1231 EXPORT_SYMBOL(dev_open);
1233 static int __dev_close(struct net_device *dev)
1235 const struct net_device_ops *ops = dev->netdev_ops;
1241 * Tell people we are going down, so that they can
1242 * prepare to death, when device is still operating.
1244 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1246 clear_bit(__LINK_STATE_START, &dev->state);
1248 /* Synchronize to scheduled poll. We cannot touch poll list,
1249 * it can be even on different cpu. So just clear netif_running().
1251 * dev->stop() will invoke napi_disable() on all of it's
1252 * napi_struct instances on this device.
1254 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1256 dev_deactivate(dev);
1259 * Call the device specific close. This cannot fail.
1260 * Only if device is UP
1262 * We allow it to be called even after a DETACH hot-plug
1269 * Device is now down.
1272 dev->flags &= ~IFF_UP;
1277 net_dmaengine_put();
1283 * dev_close - shutdown an interface.
1284 * @dev: device to shutdown
1286 * This function moves an active device into down state. A
1287 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1288 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1291 int dev_close(struct net_device *dev)
1293 if (!(dev->flags & IFF_UP))
1299 * Tell people we are down
1301 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1302 call_netdevice_notifiers(NETDEV_DOWN, dev);
1306 EXPORT_SYMBOL(dev_close);
1310 * dev_disable_lro - disable Large Receive Offload on a device
1313 * Disable Large Receive Offload (LRO) on a net device. Must be
1314 * called under RTNL. This is needed if received packets may be
1315 * forwarded to another interface.
1317 void dev_disable_lro(struct net_device *dev)
1319 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1320 dev->ethtool_ops->set_flags) {
1321 u32 flags = dev->ethtool_ops->get_flags(dev);
1322 if (flags & ETH_FLAG_LRO) {
1323 flags &= ~ETH_FLAG_LRO;
1324 dev->ethtool_ops->set_flags(dev, flags);
1327 WARN_ON(dev->features & NETIF_F_LRO);
1329 EXPORT_SYMBOL(dev_disable_lro);
1332 static int dev_boot_phase = 1;
1335 * Device change register/unregister. These are not inline or static
1336 * as we export them to the world.
1340 * register_netdevice_notifier - register a network notifier block
1343 * Register a notifier to be called when network device events occur.
1344 * The notifier passed is linked into the kernel structures and must
1345 * not be reused until it has been unregistered. A negative errno code
1346 * is returned on a failure.
1348 * When registered all registration and up events are replayed
1349 * to the new notifier to allow device to have a race free
1350 * view of the network device list.
1353 int register_netdevice_notifier(struct notifier_block *nb)
1355 struct net_device *dev;
1356 struct net_device *last;
1361 err = raw_notifier_chain_register(&netdev_chain, nb);
1367 for_each_netdev(net, dev) {
1368 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1369 err = notifier_to_errno(err);
1373 if (!(dev->flags & IFF_UP))
1376 nb->notifier_call(nb, NETDEV_UP, dev);
1387 for_each_netdev(net, dev) {
1391 if (dev->flags & IFF_UP) {
1392 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1393 nb->notifier_call(nb, NETDEV_DOWN, dev);
1395 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1396 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1400 raw_notifier_chain_unregister(&netdev_chain, nb);
1403 EXPORT_SYMBOL(register_netdevice_notifier);
1406 * unregister_netdevice_notifier - unregister a network notifier block
1409 * Unregister a notifier previously registered by
1410 * register_netdevice_notifier(). The notifier is unlinked into the
1411 * kernel structures and may then be reused. A negative errno code
1412 * is returned on a failure.
1415 int unregister_netdevice_notifier(struct notifier_block *nb)
1420 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1424 EXPORT_SYMBOL(unregister_netdevice_notifier);
1427 * call_netdevice_notifiers - call all network notifier blocks
1428 * @val: value passed unmodified to notifier function
1429 * @dev: net_device pointer passed unmodified to notifier function
1431 * Call all network notifier blocks. Parameters and return value
1432 * are as for raw_notifier_call_chain().
1435 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1438 return raw_notifier_call_chain(&netdev_chain, val, dev);
1441 /* When > 0 there are consumers of rx skb time stamps */
1442 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1444 void net_enable_timestamp(void)
1446 atomic_inc(&netstamp_needed);
1448 EXPORT_SYMBOL(net_enable_timestamp);
1450 void net_disable_timestamp(void)
1452 atomic_dec(&netstamp_needed);
1454 EXPORT_SYMBOL(net_disable_timestamp);
1456 static inline void net_timestamp_set(struct sk_buff *skb)
1458 if (atomic_read(&netstamp_needed))
1459 __net_timestamp(skb);
1461 skb->tstamp.tv64 = 0;
1464 static inline void net_timestamp_check(struct sk_buff *skb)
1466 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1467 __net_timestamp(skb);
1471 * dev_forward_skb - loopback an skb to another netif
1473 * @dev: destination network device
1474 * @skb: buffer to forward
1477 * NET_RX_SUCCESS (no congestion)
1478 * NET_RX_DROP (packet was dropped, but freed)
1480 * dev_forward_skb can be used for injecting an skb from the
1481 * start_xmit function of one device into the receive queue
1482 * of another device.
1484 * The receiving device may be in another namespace, so
1485 * we have to clear all information in the skb that could
1486 * impact namespace isolation.
1488 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1492 if (!(dev->flags & IFF_UP) ||
1493 (skb->len > (dev->mtu + dev->hard_header_len))) {
1497 skb_set_dev(skb, dev);
1498 skb->tstamp.tv64 = 0;
1499 skb->pkt_type = PACKET_HOST;
1500 skb->protocol = eth_type_trans(skb, dev);
1501 return netif_rx(skb);
1503 EXPORT_SYMBOL_GPL(dev_forward_skb);
1506 * Support routine. Sends outgoing frames to any network
1507 * taps currently in use.
1510 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1512 struct packet_type *ptype;
1514 #ifdef CONFIG_NET_CLS_ACT
1515 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1516 net_timestamp_set(skb);
1518 net_timestamp_set(skb);
1522 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1523 /* Never send packets back to the socket
1524 * they originated from - MvS (miquels@drinkel.ow.org)
1526 if ((ptype->dev == dev || !ptype->dev) &&
1527 (ptype->af_packet_priv == NULL ||
1528 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1529 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1533 /* skb->nh should be correctly
1534 set by sender, so that the second statement is
1535 just protection against buggy protocols.
1537 skb_reset_mac_header(skb2);
1539 if (skb_network_header(skb2) < skb2->data ||
1540 skb2->network_header > skb2->tail) {
1541 if (net_ratelimit())
1542 printk(KERN_CRIT "protocol %04x is "
1544 skb2->protocol, dev->name);
1545 skb_reset_network_header(skb2);
1548 skb2->transport_header = skb2->network_header;
1549 skb2->pkt_type = PACKET_OUTGOING;
1550 ptype->func(skb2, skb->dev, ptype, skb->dev);
1557 static inline void __netif_reschedule(struct Qdisc *q)
1559 struct softnet_data *sd;
1560 unsigned long flags;
1562 local_irq_save(flags);
1563 sd = &__get_cpu_var(softnet_data);
1564 q->next_sched = NULL;
1565 *sd->output_queue_tailp = q;
1566 sd->output_queue_tailp = &q->next_sched;
1567 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1568 local_irq_restore(flags);
1571 void __netif_schedule(struct Qdisc *q)
1573 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1574 __netif_reschedule(q);
1576 EXPORT_SYMBOL(__netif_schedule);
1578 void dev_kfree_skb_irq(struct sk_buff *skb)
1580 if (!skb->destructor)
1582 else if (atomic_dec_and_test(&skb->users)) {
1583 struct softnet_data *sd;
1584 unsigned long flags;
1586 local_irq_save(flags);
1587 sd = &__get_cpu_var(softnet_data);
1588 skb->next = sd->completion_queue;
1589 sd->completion_queue = skb;
1590 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1591 local_irq_restore(flags);
1594 EXPORT_SYMBOL(dev_kfree_skb_irq);
1596 void dev_kfree_skb_any(struct sk_buff *skb)
1598 if (in_irq() || irqs_disabled())
1599 dev_kfree_skb_irq(skb);
1603 EXPORT_SYMBOL(dev_kfree_skb_any);
1607 * netif_device_detach - mark device as removed
1608 * @dev: network device
1610 * Mark device as removed from system and therefore no longer available.
1612 void netif_device_detach(struct net_device *dev)
1614 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1615 netif_running(dev)) {
1616 netif_tx_stop_all_queues(dev);
1619 EXPORT_SYMBOL(netif_device_detach);
1622 * netif_device_attach - mark device as attached
1623 * @dev: network device
1625 * Mark device as attached from system and restart if needed.
1627 void netif_device_attach(struct net_device *dev)
1629 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1630 netif_running(dev)) {
1631 netif_tx_wake_all_queues(dev);
1632 __netdev_watchdog_up(dev);
1635 EXPORT_SYMBOL(netif_device_attach);
1637 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1639 return ((features & NETIF_F_GEN_CSUM) ||
1640 ((features & NETIF_F_IP_CSUM) &&
1641 protocol == htons(ETH_P_IP)) ||
1642 ((features & NETIF_F_IPV6_CSUM) &&
1643 protocol == htons(ETH_P_IPV6)) ||
1644 ((features & NETIF_F_FCOE_CRC) &&
1645 protocol == htons(ETH_P_FCOE)));
1648 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1650 if (can_checksum_protocol(dev->features, skb->protocol))
1653 if (skb->protocol == htons(ETH_P_8021Q)) {
1654 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1655 if (can_checksum_protocol(dev->features & dev->vlan_features,
1656 veh->h_vlan_encapsulated_proto))
1664 * skb_dev_set -- assign a new device to a buffer
1665 * @skb: buffer for the new device
1666 * @dev: network device
1668 * If an skb is owned by a device already, we have to reset
1669 * all data private to the namespace a device belongs to
1670 * before assigning it a new device.
1672 #ifdef CONFIG_NET_NS
1673 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1676 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1679 skb_init_secmark(skb);
1683 skb->ipvs_property = 0;
1684 #ifdef CONFIG_NET_SCHED
1690 EXPORT_SYMBOL(skb_set_dev);
1691 #endif /* CONFIG_NET_NS */
1694 * Invalidate hardware checksum when packet is to be mangled, and
1695 * complete checksum manually on outgoing path.
1697 int skb_checksum_help(struct sk_buff *skb)
1700 int ret = 0, offset;
1702 if (skb->ip_summed == CHECKSUM_COMPLETE)
1703 goto out_set_summed;
1705 if (unlikely(skb_shinfo(skb)->gso_size)) {
1706 /* Let GSO fix up the checksum. */
1707 goto out_set_summed;
1710 offset = skb->csum_start - skb_headroom(skb);
1711 BUG_ON(offset >= skb_headlen(skb));
1712 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1714 offset += skb->csum_offset;
1715 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1717 if (skb_cloned(skb) &&
1718 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1719 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1724 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1726 skb->ip_summed = CHECKSUM_NONE;
1730 EXPORT_SYMBOL(skb_checksum_help);
1733 * skb_gso_segment - Perform segmentation on skb.
1734 * @skb: buffer to segment
1735 * @features: features for the output path (see dev->features)
1737 * This function segments the given skb and returns a list of segments.
1739 * It may return NULL if the skb requires no segmentation. This is
1740 * only possible when GSO is used for verifying header integrity.
1742 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1744 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1745 struct packet_type *ptype;
1746 __be16 type = skb->protocol;
1749 skb_reset_mac_header(skb);
1750 skb->mac_len = skb->network_header - skb->mac_header;
1751 __skb_pull(skb, skb->mac_len);
1753 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1754 struct net_device *dev = skb->dev;
1755 struct ethtool_drvinfo info = {};
1757 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1758 dev->ethtool_ops->get_drvinfo(dev, &info);
1760 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1762 info.driver, dev ? dev->features : 0L,
1763 skb->sk ? skb->sk->sk_route_caps : 0L,
1764 skb->len, skb->data_len, skb->ip_summed);
1766 if (skb_header_cloned(skb) &&
1767 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1768 return ERR_PTR(err);
1772 list_for_each_entry_rcu(ptype,
1773 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1774 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1775 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1776 err = ptype->gso_send_check(skb);
1777 segs = ERR_PTR(err);
1778 if (err || skb_gso_ok(skb, features))
1780 __skb_push(skb, (skb->data -
1781 skb_network_header(skb)));
1783 segs = ptype->gso_segment(skb, features);
1789 __skb_push(skb, skb->data - skb_mac_header(skb));
1793 EXPORT_SYMBOL(skb_gso_segment);
1795 /* Take action when hardware reception checksum errors are detected. */
1797 void netdev_rx_csum_fault(struct net_device *dev)
1799 if (net_ratelimit()) {
1800 printk(KERN_ERR "%s: hw csum failure.\n",
1801 dev ? dev->name : "<unknown>");
1805 EXPORT_SYMBOL(netdev_rx_csum_fault);
1808 /* Actually, we should eliminate this check as soon as we know, that:
1809 * 1. IOMMU is present and allows to map all the memory.
1810 * 2. No high memory really exists on this machine.
1813 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1815 #ifdef CONFIG_HIGHMEM
1817 if (!(dev->features & NETIF_F_HIGHDMA)) {
1818 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1819 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1823 if (PCI_DMA_BUS_IS_PHYS) {
1824 struct device *pdev = dev->dev.parent;
1828 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1829 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1830 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1839 void (*destructor)(struct sk_buff *skb);
1842 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1844 static void dev_gso_skb_destructor(struct sk_buff *skb)
1846 struct dev_gso_cb *cb;
1849 struct sk_buff *nskb = skb->next;
1851 skb->next = nskb->next;
1854 } while (skb->next);
1856 cb = DEV_GSO_CB(skb);
1858 cb->destructor(skb);
1862 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1863 * @skb: buffer to segment
1865 * This function segments the given skb and stores the list of segments
1868 static int dev_gso_segment(struct sk_buff *skb)
1870 struct net_device *dev = skb->dev;
1871 struct sk_buff *segs;
1872 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1875 segs = skb_gso_segment(skb, features);
1877 /* Verifying header integrity only. */
1882 return PTR_ERR(segs);
1885 DEV_GSO_CB(skb)->destructor = skb->destructor;
1886 skb->destructor = dev_gso_skb_destructor;
1892 * Try to orphan skb early, right before transmission by the device.
1893 * We cannot orphan skb if tx timestamp is requested, since
1894 * drivers need to call skb_tstamp_tx() to send the timestamp.
1896 static inline void skb_orphan_try(struct sk_buff *skb)
1898 if (!skb_tx(skb)->flags)
1902 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1903 struct netdev_queue *txq)
1905 const struct net_device_ops *ops = dev->netdev_ops;
1906 int rc = NETDEV_TX_OK;
1908 if (likely(!skb->next)) {
1909 if (!list_empty(&ptype_all))
1910 dev_queue_xmit_nit(skb, dev);
1913 * If device doesnt need skb->dst, release it right now while
1914 * its hot in this cpu cache
1916 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1919 skb_orphan_try(skb);
1921 if (netif_needs_gso(dev, skb)) {
1922 if (unlikely(dev_gso_segment(skb)))
1928 rc = ops->ndo_start_xmit(skb, dev);
1929 if (rc == NETDEV_TX_OK)
1930 txq_trans_update(txq);
1936 struct sk_buff *nskb = skb->next;
1938 skb->next = nskb->next;
1942 * If device doesnt need nskb->dst, release it right now while
1943 * its hot in this cpu cache
1945 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1948 rc = ops->ndo_start_xmit(nskb, dev);
1949 if (unlikely(rc != NETDEV_TX_OK)) {
1950 if (rc & ~NETDEV_TX_MASK)
1951 goto out_kfree_gso_skb;
1952 nskb->next = skb->next;
1956 txq_trans_update(txq);
1957 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1958 return NETDEV_TX_BUSY;
1959 } while (skb->next);
1962 if (likely(skb->next == NULL))
1963 skb->destructor = DEV_GSO_CB(skb)->destructor;
1969 static u32 hashrnd __read_mostly;
1971 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1975 if (skb_rx_queue_recorded(skb)) {
1976 hash = skb_get_rx_queue(skb);
1977 while (unlikely(hash >= dev->real_num_tx_queues))
1978 hash -= dev->real_num_tx_queues;
1982 if (skb->sk && skb->sk->sk_hash)
1983 hash = skb->sk->sk_hash;
1985 hash = (__force u16) skb->protocol;
1987 hash = jhash_1word(hash, hashrnd);
1989 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1991 EXPORT_SYMBOL(skb_tx_hash);
1993 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
1995 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
1996 if (net_ratelimit()) {
1997 pr_warning("%s selects TX queue %d, but "
1998 "real number of TX queues is %d\n",
1999 dev->name, queue_index, dev->real_num_tx_queues);
2006 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2007 struct sk_buff *skb)
2010 struct sock *sk = skb->sk;
2012 if (sk_tx_queue_recorded(sk)) {
2013 queue_index = sk_tx_queue_get(sk);
2015 const struct net_device_ops *ops = dev->netdev_ops;
2017 if (ops->ndo_select_queue) {
2018 queue_index = ops->ndo_select_queue(dev, skb);
2019 queue_index = dev_cap_txqueue(dev, queue_index);
2022 if (dev->real_num_tx_queues > 1)
2023 queue_index = skb_tx_hash(dev, skb);
2026 struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
2028 if (dst && skb_dst(skb) == dst)
2029 sk_tx_queue_set(sk, queue_index);
2034 skb_set_queue_mapping(skb, queue_index);
2035 return netdev_get_tx_queue(dev, queue_index);
2038 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2039 struct net_device *dev,
2040 struct netdev_queue *txq)
2042 spinlock_t *root_lock = qdisc_lock(q);
2043 bool contended = qdisc_is_running(q);
2047 * Heuristic to force contended enqueues to serialize on a
2048 * separate lock before trying to get qdisc main lock.
2049 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2050 * and dequeue packets faster.
2052 if (unlikely(contended))
2053 spin_lock(&q->busylock);
2055 spin_lock(root_lock);
2056 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2059 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2060 qdisc_run_begin(q)) {
2062 * This is a work-conserving queue; there are no old skbs
2063 * waiting to be sent out; and the qdisc is not running -
2064 * xmit the skb directly.
2066 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2068 __qdisc_update_bstats(q, skb->len);
2069 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2070 if (unlikely(contended)) {
2071 spin_unlock(&q->busylock);
2078 rc = NET_XMIT_SUCCESS;
2081 rc = qdisc_enqueue_root(skb, q);
2082 if (qdisc_run_begin(q)) {
2083 if (unlikely(contended)) {
2084 spin_unlock(&q->busylock);
2090 spin_unlock(root_lock);
2091 if (unlikely(contended))
2092 spin_unlock(&q->busylock);
2097 * Returns true if either:
2098 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2099 * 2. skb is fragmented and the device does not support SG, or if
2100 * at least one of fragments is in highmem and device does not
2101 * support DMA from it.
2103 static inline int skb_needs_linearize(struct sk_buff *skb,
2104 struct net_device *dev)
2106 return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
2107 (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
2108 illegal_highdma(dev, skb)));
2112 * dev_queue_xmit - transmit a buffer
2113 * @skb: buffer to transmit
2115 * Queue a buffer for transmission to a network device. The caller must
2116 * have set the device and priority and built the buffer before calling
2117 * this function. The function can be called from an interrupt.
2119 * A negative errno code is returned on a failure. A success does not
2120 * guarantee the frame will be transmitted as it may be dropped due
2121 * to congestion or traffic shaping.
2123 * -----------------------------------------------------------------------------------
2124 * I notice this method can also return errors from the queue disciplines,
2125 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2128 * Regardless of the return value, the skb is consumed, so it is currently
2129 * difficult to retry a send to this method. (You can bump the ref count
2130 * before sending to hold a reference for retry if you are careful.)
2132 * When calling this method, interrupts MUST be enabled. This is because
2133 * the BH enable code must have IRQs enabled so that it will not deadlock.
2136 int dev_queue_xmit(struct sk_buff *skb)
2138 struct net_device *dev = skb->dev;
2139 struct netdev_queue *txq;
2143 /* GSO will handle the following emulations directly. */
2144 if (netif_needs_gso(dev, skb))
2147 /* Convert a paged skb to linear, if required */
2148 if (skb_needs_linearize(skb, dev) && __skb_linearize(skb))
2151 /* If packet is not checksummed and device does not support
2152 * checksumming for this protocol, complete checksumming here.
2154 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2155 skb_set_transport_header(skb, skb->csum_start -
2157 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
2162 /* Disable soft irqs for various locks below. Also
2163 * stops preemption for RCU.
2167 txq = dev_pick_tx(dev, skb);
2168 q = rcu_dereference_bh(txq->qdisc);
2170 #ifdef CONFIG_NET_CLS_ACT
2171 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2174 rc = __dev_xmit_skb(skb, q, dev, txq);
2178 /* The device has no queue. Common case for software devices:
2179 loopback, all the sorts of tunnels...
2181 Really, it is unlikely that netif_tx_lock protection is necessary
2182 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2184 However, it is possible, that they rely on protection
2187 Check this and shot the lock. It is not prone from deadlocks.
2188 Either shot noqueue qdisc, it is even simpler 8)
2190 if (dev->flags & IFF_UP) {
2191 int cpu = smp_processor_id(); /* ok because BHs are off */
2193 if (txq->xmit_lock_owner != cpu) {
2195 HARD_TX_LOCK(dev, txq, cpu);
2197 if (!netif_tx_queue_stopped(txq)) {
2198 rc = dev_hard_start_xmit(skb, dev, txq);
2199 if (dev_xmit_complete(rc)) {
2200 HARD_TX_UNLOCK(dev, txq);
2204 HARD_TX_UNLOCK(dev, txq);
2205 if (net_ratelimit())
2206 printk(KERN_CRIT "Virtual device %s asks to "
2207 "queue packet!\n", dev->name);
2209 /* Recursion is detected! It is possible,
2211 if (net_ratelimit())
2212 printk(KERN_CRIT "Dead loop on virtual device "
2213 "%s, fix it urgently!\n", dev->name);
2218 rcu_read_unlock_bh();
2224 rcu_read_unlock_bh();
2227 EXPORT_SYMBOL(dev_queue_xmit);
2230 /*=======================================================================
2232 =======================================================================*/
2234 int netdev_max_backlog __read_mostly = 1000;
2235 int netdev_tstamp_prequeue __read_mostly = 1;
2236 int netdev_budget __read_mostly = 300;
2237 int weight_p __read_mostly = 64; /* old backlog weight */
2239 /* Called with irq disabled */
2240 static inline void ____napi_schedule(struct softnet_data *sd,
2241 struct napi_struct *napi)
2243 list_add_tail(&napi->poll_list, &sd->poll_list);
2244 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2249 /* One global table that all flow-based protocols share. */
2250 struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
2251 EXPORT_SYMBOL(rps_sock_flow_table);
2254 * get_rps_cpu is called from netif_receive_skb and returns the target
2255 * CPU from the RPS map of the receiving queue for a given skb.
2256 * rcu_read_lock must be held on entry.
2258 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2259 struct rps_dev_flow **rflowp)
2261 struct ipv6hdr *ip6;
2263 struct netdev_rx_queue *rxqueue;
2264 struct rps_map *map;
2265 struct rps_dev_flow_table *flow_table;
2266 struct rps_sock_flow_table *sock_flow_table;
2270 u32 addr1, addr2, ihl;
2276 if (skb_rx_queue_recorded(skb)) {
2277 u16 index = skb_get_rx_queue(skb);
2278 if (unlikely(index >= dev->num_rx_queues)) {
2279 if (net_ratelimit()) {
2280 pr_warning("%s received packet on queue "
2281 "%u, but number of RX queues is %u\n",
2282 dev->name, index, dev->num_rx_queues);
2286 rxqueue = dev->_rx + index;
2290 if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
2294 goto got_hash; /* Skip hash computation on packet header */
2296 switch (skb->protocol) {
2297 case __constant_htons(ETH_P_IP):
2298 if (!pskb_may_pull(skb, sizeof(*ip)))
2301 ip = (struct iphdr *) skb->data;
2302 ip_proto = ip->protocol;
2303 addr1 = (__force u32) ip->saddr;
2304 addr2 = (__force u32) ip->daddr;
2307 case __constant_htons(ETH_P_IPV6):
2308 if (!pskb_may_pull(skb, sizeof(*ip6)))
2311 ip6 = (struct ipv6hdr *) skb->data;
2312 ip_proto = ip6->nexthdr;
2313 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2314 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2327 case IPPROTO_UDPLITE:
2328 if (pskb_may_pull(skb, (ihl * 4) + 4)) {
2329 ports.v32 = * (__force u32 *) (skb->data + (ihl * 4));
2330 if (ports.v16[1] < ports.v16[0])
2331 swap(ports.v16[0], ports.v16[1]);
2339 /* get a consistent hash (same value on both flow directions) */
2342 skb->rxhash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2347 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2348 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2349 if (flow_table && sock_flow_table) {
2351 struct rps_dev_flow *rflow;
2353 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2356 next_cpu = sock_flow_table->ents[skb->rxhash &
2357 sock_flow_table->mask];
2360 * If the desired CPU (where last recvmsg was done) is
2361 * different from current CPU (one in the rx-queue flow
2362 * table entry), switch if one of the following holds:
2363 * - Current CPU is unset (equal to RPS_NO_CPU).
2364 * - Current CPU is offline.
2365 * - The current CPU's queue tail has advanced beyond the
2366 * last packet that was enqueued using this table entry.
2367 * This guarantees that all previous packets for the flow
2368 * have been dequeued, thus preserving in order delivery.
2370 if (unlikely(tcpu != next_cpu) &&
2371 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2372 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2373 rflow->last_qtail)) >= 0)) {
2374 tcpu = rflow->cpu = next_cpu;
2375 if (tcpu != RPS_NO_CPU)
2376 rflow->last_qtail = per_cpu(softnet_data,
2377 tcpu).input_queue_head;
2379 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2386 map = rcu_dereference(rxqueue->rps_map);
2388 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2390 if (cpu_online(tcpu)) {
2400 /* Called from hardirq (IPI) context */
2401 static void rps_trigger_softirq(void *data)
2403 struct softnet_data *sd = data;
2405 ____napi_schedule(sd, &sd->backlog);
2409 #endif /* CONFIG_RPS */
2412 * Check if this softnet_data structure is another cpu one
2413 * If yes, queue it to our IPI list and return 1
2416 static int rps_ipi_queued(struct softnet_data *sd)
2419 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2422 sd->rps_ipi_next = mysd->rps_ipi_list;
2423 mysd->rps_ipi_list = sd;
2425 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2428 #endif /* CONFIG_RPS */
2433 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2434 * queue (may be a remote CPU queue).
2436 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2437 unsigned int *qtail)
2439 struct softnet_data *sd;
2440 unsigned long flags;
2442 sd = &per_cpu(softnet_data, cpu);
2444 local_irq_save(flags);
2447 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2448 if (skb_queue_len(&sd->input_pkt_queue)) {
2450 __skb_queue_tail(&sd->input_pkt_queue, skb);
2451 input_queue_tail_incr_save(sd, qtail);
2453 local_irq_restore(flags);
2454 return NET_RX_SUCCESS;
2457 /* Schedule NAPI for backlog device
2458 * We can use non atomic operation since we own the queue lock
2460 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2461 if (!rps_ipi_queued(sd))
2462 ____napi_schedule(sd, &sd->backlog);
2470 local_irq_restore(flags);
2477 * netif_rx - post buffer to the network code
2478 * @skb: buffer to post
2480 * This function receives a packet from a device driver and queues it for
2481 * the upper (protocol) levels to process. It always succeeds. The buffer
2482 * may be dropped during processing for congestion control or by the
2486 * NET_RX_SUCCESS (no congestion)
2487 * NET_RX_DROP (packet was dropped)
2491 int netif_rx(struct sk_buff *skb)
2495 /* if netpoll wants it, pretend we never saw it */
2496 if (netpoll_rx(skb))
2499 if (netdev_tstamp_prequeue)
2500 net_timestamp_check(skb);
2504 struct rps_dev_flow voidflow, *rflow = &voidflow;
2509 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2511 cpu = smp_processor_id();
2513 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2520 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2526 EXPORT_SYMBOL(netif_rx);
2528 int netif_rx_ni(struct sk_buff *skb)
2533 err = netif_rx(skb);
2534 if (local_softirq_pending())
2540 EXPORT_SYMBOL(netif_rx_ni);
2542 static void net_tx_action(struct softirq_action *h)
2544 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2546 if (sd->completion_queue) {
2547 struct sk_buff *clist;
2549 local_irq_disable();
2550 clist = sd->completion_queue;
2551 sd->completion_queue = NULL;
2555 struct sk_buff *skb = clist;
2556 clist = clist->next;
2558 WARN_ON(atomic_read(&skb->users));
2563 if (sd->output_queue) {
2566 local_irq_disable();
2567 head = sd->output_queue;
2568 sd->output_queue = NULL;
2569 sd->output_queue_tailp = &sd->output_queue;
2573 struct Qdisc *q = head;
2574 spinlock_t *root_lock;
2576 head = head->next_sched;
2578 root_lock = qdisc_lock(q);
2579 if (spin_trylock(root_lock)) {
2580 smp_mb__before_clear_bit();
2581 clear_bit(__QDISC_STATE_SCHED,
2584 spin_unlock(root_lock);
2586 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2588 __netif_reschedule(q);
2590 smp_mb__before_clear_bit();
2591 clear_bit(__QDISC_STATE_SCHED,
2599 static inline int deliver_skb(struct sk_buff *skb,
2600 struct packet_type *pt_prev,
2601 struct net_device *orig_dev)
2603 atomic_inc(&skb->users);
2604 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2607 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
2608 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
2609 /* This hook is defined here for ATM LANE */
2610 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2611 unsigned char *addr) __read_mostly;
2612 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2615 #ifdef CONFIG_NET_CLS_ACT
2616 /* TODO: Maybe we should just force sch_ingress to be compiled in
2617 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2618 * a compare and 2 stores extra right now if we dont have it on
2619 * but have CONFIG_NET_CLS_ACT
2620 * NOTE: This doesnt stop any functionality; if you dont have
2621 * the ingress scheduler, you just cant add policies on ingress.
2624 static int ing_filter(struct sk_buff *skb)
2626 struct net_device *dev = skb->dev;
2627 u32 ttl = G_TC_RTTL(skb->tc_verd);
2628 struct netdev_queue *rxq;
2629 int result = TC_ACT_OK;
2632 if (MAX_RED_LOOP < ttl++) {
2634 "Redir loop detected Dropping packet (%d->%d)\n",
2635 skb->skb_iif, dev->ifindex);
2639 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2640 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2642 rxq = &dev->rx_queue;
2645 if (q != &noop_qdisc) {
2646 spin_lock(qdisc_lock(q));
2647 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2648 result = qdisc_enqueue_root(skb, q);
2649 spin_unlock(qdisc_lock(q));
2655 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2656 struct packet_type **pt_prev,
2657 int *ret, struct net_device *orig_dev)
2659 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2663 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2666 /* Huh? Why does turning on AF_PACKET affect this? */
2667 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2670 switch (ing_filter(skb)) {
2684 * netif_nit_deliver - deliver received packets to network taps
2687 * This function is used to deliver incoming packets to network
2688 * taps. It should be used when the normal netif_receive_skb path
2689 * is bypassed, for example because of VLAN acceleration.
2691 void netif_nit_deliver(struct sk_buff *skb)
2693 struct packet_type *ptype;
2695 if (list_empty(&ptype_all))
2698 skb_reset_network_header(skb);
2699 skb_reset_transport_header(skb);
2700 skb->mac_len = skb->network_header - skb->mac_header;
2703 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2704 if (!ptype->dev || ptype->dev == skb->dev)
2705 deliver_skb(skb, ptype, skb->dev);
2711 * netdev_rx_handler_register - register receive handler
2712 * @dev: device to register a handler for
2713 * @rx_handler: receive handler to register
2715 * Register a receive hander for a device. This handler will then be
2716 * called from __netif_receive_skb. A negative errno code is returned
2719 * The caller must hold the rtnl_mutex.
2721 int netdev_rx_handler_register(struct net_device *dev,
2722 rx_handler_func_t *rx_handler)
2726 if (dev->rx_handler)
2729 rcu_assign_pointer(dev->rx_handler, rx_handler);
2733 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
2736 * netdev_rx_handler_unregister - unregister receive handler
2737 * @dev: device to unregister a handler from
2739 * Unregister a receive hander from a device.
2741 * The caller must hold the rtnl_mutex.
2743 void netdev_rx_handler_unregister(struct net_device *dev)
2747 rcu_assign_pointer(dev->rx_handler, NULL);
2749 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
2751 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2752 struct net_device *master)
2754 if (skb->pkt_type == PACKET_HOST) {
2755 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2757 memcpy(dest, master->dev_addr, ETH_ALEN);
2761 /* On bonding slaves other than the currently active slave, suppress
2762 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2763 * ARP on active-backup slaves with arp_validate enabled.
2765 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2767 struct net_device *dev = skb->dev;
2769 if (master->priv_flags & IFF_MASTER_ARPMON)
2770 dev->last_rx = jiffies;
2772 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
2773 /* Do address unmangle. The local destination address
2774 * will be always the one master has. Provides the right
2775 * functionality in a bridge.
2777 skb_bond_set_mac_by_master(skb, master);
2780 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2781 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2782 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2785 if (master->priv_flags & IFF_MASTER_ALB) {
2786 if (skb->pkt_type != PACKET_BROADCAST &&
2787 skb->pkt_type != PACKET_MULTICAST)
2790 if (master->priv_flags & IFF_MASTER_8023AD &&
2791 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2798 EXPORT_SYMBOL(__skb_bond_should_drop);
2800 static int __netif_receive_skb(struct sk_buff *skb)
2802 struct packet_type *ptype, *pt_prev;
2803 rx_handler_func_t *rx_handler;
2804 struct net_device *orig_dev;
2805 struct net_device *master;
2806 struct net_device *null_or_orig;
2807 struct net_device *null_or_bond;
2808 int ret = NET_RX_DROP;
2811 if (!netdev_tstamp_prequeue)
2812 net_timestamp_check(skb);
2814 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2815 return NET_RX_SUCCESS;
2817 /* if we've gotten here through NAPI, check netpoll */
2818 if (netpoll_receive_skb(skb))
2822 skb->skb_iif = skb->dev->ifindex;
2824 null_or_orig = NULL;
2825 orig_dev = skb->dev;
2826 master = ACCESS_ONCE(orig_dev->master);
2828 if (skb_bond_should_drop(skb, master))
2829 null_or_orig = orig_dev; /* deliver only exact match */
2834 __this_cpu_inc(softnet_data.processed);
2835 skb_reset_network_header(skb);
2836 skb_reset_transport_header(skb);
2837 skb->mac_len = skb->network_header - skb->mac_header;
2843 #ifdef CONFIG_NET_CLS_ACT
2844 if (skb->tc_verd & TC_NCLS) {
2845 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2850 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2851 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2852 ptype->dev == orig_dev) {
2854 ret = deliver_skb(skb, pt_prev, orig_dev);
2859 #ifdef CONFIG_NET_CLS_ACT
2860 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2866 /* Handle special case of bridge or macvlan */
2867 rx_handler = rcu_dereference(skb->dev->rx_handler);
2870 ret = deliver_skb(skb, pt_prev, orig_dev);
2873 skb = rx_handler(skb);
2879 * Make sure frames received on VLAN interfaces stacked on
2880 * bonding interfaces still make their way to any base bonding
2881 * device that may have registered for a specific ptype. The
2882 * handler may have to adjust skb->dev and orig_dev.
2884 null_or_bond = NULL;
2885 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2886 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2887 null_or_bond = vlan_dev_real_dev(skb->dev);
2890 type = skb->protocol;
2891 list_for_each_entry_rcu(ptype,
2892 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2893 if (ptype->type == type && (ptype->dev == null_or_orig ||
2894 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2895 ptype->dev == null_or_bond)) {
2897 ret = deliver_skb(skb, pt_prev, orig_dev);
2903 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2906 /* Jamal, now you will not able to escape explaining
2907 * me how you were going to use this. :-)
2918 * netif_receive_skb - process receive buffer from network
2919 * @skb: buffer to process
2921 * netif_receive_skb() is the main receive data processing function.
2922 * It always succeeds. The buffer may be dropped during processing
2923 * for congestion control or by the protocol layers.
2925 * This function may only be called from softirq context and interrupts
2926 * should be enabled.
2928 * Return values (usually ignored):
2929 * NET_RX_SUCCESS: no congestion
2930 * NET_RX_DROP: packet was dropped
2932 int netif_receive_skb(struct sk_buff *skb)
2934 if (netdev_tstamp_prequeue)
2935 net_timestamp_check(skb);
2939 struct rps_dev_flow voidflow, *rflow = &voidflow;
2944 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2947 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2951 ret = __netif_receive_skb(skb);
2957 return __netif_receive_skb(skb);
2960 EXPORT_SYMBOL(netif_receive_skb);
2962 /* Network device is going away, flush any packets still pending
2963 * Called with irqs disabled.
2965 static void flush_backlog(void *arg)
2967 struct net_device *dev = arg;
2968 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2969 struct sk_buff *skb, *tmp;
2972 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
2973 if (skb->dev == dev) {
2974 __skb_unlink(skb, &sd->input_pkt_queue);
2976 input_queue_head_incr(sd);
2981 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
2982 if (skb->dev == dev) {
2983 __skb_unlink(skb, &sd->process_queue);
2985 input_queue_head_incr(sd);
2990 static int napi_gro_complete(struct sk_buff *skb)
2992 struct packet_type *ptype;
2993 __be16 type = skb->protocol;
2994 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2997 if (NAPI_GRO_CB(skb)->count == 1) {
2998 skb_shinfo(skb)->gso_size = 0;
3003 list_for_each_entry_rcu(ptype, head, list) {
3004 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3007 err = ptype->gro_complete(skb);
3013 WARN_ON(&ptype->list == head);
3015 return NET_RX_SUCCESS;
3019 return netif_receive_skb(skb);
3022 static void napi_gro_flush(struct napi_struct *napi)
3024 struct sk_buff *skb, *next;
3026 for (skb = napi->gro_list; skb; skb = next) {
3029 napi_gro_complete(skb);
3032 napi->gro_count = 0;
3033 napi->gro_list = NULL;
3036 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3038 struct sk_buff **pp = NULL;
3039 struct packet_type *ptype;
3040 __be16 type = skb->protocol;
3041 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3044 enum gro_result ret;
3046 if (!(skb->dev->features & NETIF_F_GRO))
3049 if (skb_is_gso(skb) || skb_has_frags(skb))
3053 list_for_each_entry_rcu(ptype, head, list) {
3054 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3057 skb_set_network_header(skb, skb_gro_offset(skb));
3058 mac_len = skb->network_header - skb->mac_header;
3059 skb->mac_len = mac_len;
3060 NAPI_GRO_CB(skb)->same_flow = 0;
3061 NAPI_GRO_CB(skb)->flush = 0;
3062 NAPI_GRO_CB(skb)->free = 0;
3064 pp = ptype->gro_receive(&napi->gro_list, skb);
3069 if (&ptype->list == head)
3072 same_flow = NAPI_GRO_CB(skb)->same_flow;
3073 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3076 struct sk_buff *nskb = *pp;
3080 napi_gro_complete(nskb);
3087 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3091 NAPI_GRO_CB(skb)->count = 1;
3092 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3093 skb->next = napi->gro_list;
3094 napi->gro_list = skb;
3098 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3099 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3101 BUG_ON(skb->end - skb->tail < grow);
3103 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3106 skb->data_len -= grow;
3108 skb_shinfo(skb)->frags[0].page_offset += grow;
3109 skb_shinfo(skb)->frags[0].size -= grow;
3111 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3112 put_page(skb_shinfo(skb)->frags[0].page);
3113 memmove(skb_shinfo(skb)->frags,
3114 skb_shinfo(skb)->frags + 1,
3115 --skb_shinfo(skb)->nr_frags);
3126 EXPORT_SYMBOL(dev_gro_receive);
3129 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3133 if (netpoll_rx_on(skb))
3136 for (p = napi->gro_list; p; p = p->next) {
3137 NAPI_GRO_CB(p)->same_flow =
3138 (p->dev == skb->dev) &&
3139 !compare_ether_header(skb_mac_header(p),
3140 skb_gro_mac_header(skb));
3141 NAPI_GRO_CB(p)->flush = 0;
3144 return dev_gro_receive(napi, skb);
3147 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3151 if (netif_receive_skb(skb))
3156 case GRO_MERGED_FREE:
3167 EXPORT_SYMBOL(napi_skb_finish);
3169 void skb_gro_reset_offset(struct sk_buff *skb)
3171 NAPI_GRO_CB(skb)->data_offset = 0;
3172 NAPI_GRO_CB(skb)->frag0 = NULL;
3173 NAPI_GRO_CB(skb)->frag0_len = 0;
3175 if (skb->mac_header == skb->tail &&
3176 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3177 NAPI_GRO_CB(skb)->frag0 =
3178 page_address(skb_shinfo(skb)->frags[0].page) +
3179 skb_shinfo(skb)->frags[0].page_offset;
3180 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3183 EXPORT_SYMBOL(skb_gro_reset_offset);
3185 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3187 skb_gro_reset_offset(skb);
3189 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3191 EXPORT_SYMBOL(napi_gro_receive);
3193 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3195 __skb_pull(skb, skb_headlen(skb));
3196 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3200 EXPORT_SYMBOL(napi_reuse_skb);
3202 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3204 struct sk_buff *skb = napi->skb;
3207 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3213 EXPORT_SYMBOL(napi_get_frags);
3215 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3221 skb->protocol = eth_type_trans(skb, skb->dev);
3223 if (ret == GRO_HELD)
3224 skb_gro_pull(skb, -ETH_HLEN);
3225 else if (netif_receive_skb(skb))
3230 case GRO_MERGED_FREE:
3231 napi_reuse_skb(napi, skb);
3240 EXPORT_SYMBOL(napi_frags_finish);
3242 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3244 struct sk_buff *skb = napi->skb;
3251 skb_reset_mac_header(skb);
3252 skb_gro_reset_offset(skb);
3254 off = skb_gro_offset(skb);
3255 hlen = off + sizeof(*eth);
3256 eth = skb_gro_header_fast(skb, off);
3257 if (skb_gro_header_hard(skb, hlen)) {
3258 eth = skb_gro_header_slow(skb, hlen, off);
3259 if (unlikely(!eth)) {
3260 napi_reuse_skb(napi, skb);
3266 skb_gro_pull(skb, sizeof(*eth));
3269 * This works because the only protocols we care about don't require
3270 * special handling. We'll fix it up properly at the end.
3272 skb->protocol = eth->h_proto;
3277 EXPORT_SYMBOL(napi_frags_skb);
3279 gro_result_t napi_gro_frags(struct napi_struct *napi)
3281 struct sk_buff *skb = napi_frags_skb(napi);
3286 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3288 EXPORT_SYMBOL(napi_gro_frags);
3291 * net_rps_action sends any pending IPI's for rps.
3292 * Note: called with local irq disabled, but exits with local irq enabled.
3294 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3297 struct softnet_data *remsd = sd->rps_ipi_list;
3300 sd->rps_ipi_list = NULL;
3304 /* Send pending IPI's to kick RPS processing on remote cpus. */
3306 struct softnet_data *next = remsd->rps_ipi_next;
3308 if (cpu_online(remsd->cpu))
3309 __smp_call_function_single(remsd->cpu,
3318 static int process_backlog(struct napi_struct *napi, int quota)
3321 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3324 /* Check if we have pending ipi, its better to send them now,
3325 * not waiting net_rx_action() end.
3327 if (sd->rps_ipi_list) {
3328 local_irq_disable();
3329 net_rps_action_and_irq_enable(sd);
3332 napi->weight = weight_p;
3333 local_irq_disable();
3334 while (work < quota) {
3335 struct sk_buff *skb;
3338 while ((skb = __skb_dequeue(&sd->process_queue))) {
3340 __netif_receive_skb(skb);
3341 local_irq_disable();
3342 input_queue_head_incr(sd);
3343 if (++work >= quota) {
3350 qlen = skb_queue_len(&sd->input_pkt_queue);
3352 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3353 &sd->process_queue);
3355 if (qlen < quota - work) {
3357 * Inline a custom version of __napi_complete().
3358 * only current cpu owns and manipulates this napi,
3359 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3360 * we can use a plain write instead of clear_bit(),
3361 * and we dont need an smp_mb() memory barrier.
3363 list_del(&napi->poll_list);
3366 quota = work + qlen;
3376 * __napi_schedule - schedule for receive
3377 * @n: entry to schedule
3379 * The entry's receive function will be scheduled to run
3381 void __napi_schedule(struct napi_struct *n)
3383 unsigned long flags;
3385 local_irq_save(flags);
3386 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3387 local_irq_restore(flags);
3389 EXPORT_SYMBOL(__napi_schedule);
3391 void __napi_complete(struct napi_struct *n)
3393 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3394 BUG_ON(n->gro_list);
3396 list_del(&n->poll_list);
3397 smp_mb__before_clear_bit();
3398 clear_bit(NAPI_STATE_SCHED, &n->state);
3400 EXPORT_SYMBOL(__napi_complete);
3402 void napi_complete(struct napi_struct *n)
3404 unsigned long flags;
3407 * don't let napi dequeue from the cpu poll list
3408 * just in case its running on a different cpu
3410 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3414 local_irq_save(flags);
3416 local_irq_restore(flags);
3418 EXPORT_SYMBOL(napi_complete);
3420 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3421 int (*poll)(struct napi_struct *, int), int weight)
3423 INIT_LIST_HEAD(&napi->poll_list);
3424 napi->gro_count = 0;
3425 napi->gro_list = NULL;
3428 napi->weight = weight;
3429 list_add(&napi->dev_list, &dev->napi_list);
3431 #ifdef CONFIG_NETPOLL
3432 spin_lock_init(&napi->poll_lock);
3433 napi->poll_owner = -1;
3435 set_bit(NAPI_STATE_SCHED, &napi->state);
3437 EXPORT_SYMBOL(netif_napi_add);
3439 void netif_napi_del(struct napi_struct *napi)
3441 struct sk_buff *skb, *next;
3443 list_del_init(&napi->dev_list);
3444 napi_free_frags(napi);
3446 for (skb = napi->gro_list; skb; skb = next) {
3452 napi->gro_list = NULL;
3453 napi->gro_count = 0;
3455 EXPORT_SYMBOL(netif_napi_del);
3457 static void net_rx_action(struct softirq_action *h)
3459 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3460 unsigned long time_limit = jiffies + 2;
3461 int budget = netdev_budget;
3464 local_irq_disable();
3466 while (!list_empty(&sd->poll_list)) {
3467 struct napi_struct *n;
3470 /* If softirq window is exhuasted then punt.
3471 * Allow this to run for 2 jiffies since which will allow
3472 * an average latency of 1.5/HZ.
3474 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3479 /* Even though interrupts have been re-enabled, this
3480 * access is safe because interrupts can only add new
3481 * entries to the tail of this list, and only ->poll()
3482 * calls can remove this head entry from the list.
3484 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3486 have = netpoll_poll_lock(n);
3490 /* This NAPI_STATE_SCHED test is for avoiding a race
3491 * with netpoll's poll_napi(). Only the entity which
3492 * obtains the lock and sees NAPI_STATE_SCHED set will
3493 * actually make the ->poll() call. Therefore we avoid
3494 * accidently calling ->poll() when NAPI is not scheduled.
3497 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3498 work = n->poll(n, weight);
3502 WARN_ON_ONCE(work > weight);
3506 local_irq_disable();
3508 /* Drivers must not modify the NAPI state if they
3509 * consume the entire weight. In such cases this code
3510 * still "owns" the NAPI instance and therefore can
3511 * move the instance around on the list at-will.
3513 if (unlikely(work == weight)) {
3514 if (unlikely(napi_disable_pending(n))) {
3517 local_irq_disable();
3519 list_move_tail(&n->poll_list, &sd->poll_list);
3522 netpoll_poll_unlock(have);
3525 net_rps_action_and_irq_enable(sd);
3527 #ifdef CONFIG_NET_DMA
3529 * There may not be any more sk_buffs coming right now, so push
3530 * any pending DMA copies to hardware
3532 dma_issue_pending_all();
3539 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3543 static gifconf_func_t *gifconf_list[NPROTO];
3546 * register_gifconf - register a SIOCGIF handler
3547 * @family: Address family
3548 * @gifconf: Function handler
3550 * Register protocol dependent address dumping routines. The handler
3551 * that is passed must not be freed or reused until it has been replaced
3552 * by another handler.
3554 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3556 if (family >= NPROTO)
3558 gifconf_list[family] = gifconf;
3561 EXPORT_SYMBOL(register_gifconf);
3565 * Map an interface index to its name (SIOCGIFNAME)
3569 * We need this ioctl for efficient implementation of the
3570 * if_indextoname() function required by the IPv6 API. Without
3571 * it, we would have to search all the interfaces to find a
3575 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3577 struct net_device *dev;
3581 * Fetch the caller's info block.
3584 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3588 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3594 strcpy(ifr.ifr_name, dev->name);
3597 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3603 * Perform a SIOCGIFCONF call. This structure will change
3604 * size eventually, and there is nothing I can do about it.
3605 * Thus we will need a 'compatibility mode'.
3608 static int dev_ifconf(struct net *net, char __user *arg)
3611 struct net_device *dev;
3618 * Fetch the caller's info block.
3621 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3628 * Loop over the interfaces, and write an info block for each.
3632 for_each_netdev(net, dev) {
3633 for (i = 0; i < NPROTO; i++) {
3634 if (gifconf_list[i]) {
3637 done = gifconf_list[i](dev, NULL, 0);
3639 done = gifconf_list[i](dev, pos + total,
3649 * All done. Write the updated control block back to the caller.
3651 ifc.ifc_len = total;
3654 * Both BSD and Solaris return 0 here, so we do too.
3656 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3659 #ifdef CONFIG_PROC_FS
3661 * This is invoked by the /proc filesystem handler to display a device
3664 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3667 struct net *net = seq_file_net(seq);
3669 struct net_device *dev;
3673 return SEQ_START_TOKEN;
3676 for_each_netdev_rcu(net, dev)
3683 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3685 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3686 first_net_device(seq_file_net(seq)) :
3687 next_net_device((struct net_device *)v);
3690 return rcu_dereference(dev);
3693 void dev_seq_stop(struct seq_file *seq, void *v)
3699 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3701 const struct net_device_stats *stats = dev_get_stats(dev);
3703 seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3704 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3705 dev->name, stats->rx_bytes, stats->rx_packets,
3707 stats->rx_dropped + stats->rx_missed_errors,
3708 stats->rx_fifo_errors,
3709 stats->rx_length_errors + stats->rx_over_errors +
3710 stats->rx_crc_errors + stats->rx_frame_errors,
3711 stats->rx_compressed, stats->multicast,
3712 stats->tx_bytes, stats->tx_packets,
3713 stats->tx_errors, stats->tx_dropped,
3714 stats->tx_fifo_errors, stats->collisions,
3715 stats->tx_carrier_errors +
3716 stats->tx_aborted_errors +
3717 stats->tx_window_errors +
3718 stats->tx_heartbeat_errors,
3719 stats->tx_compressed);
3723 * Called from the PROCfs module. This now uses the new arbitrary sized
3724 * /proc/net interface to create /proc/net/dev
3726 static int dev_seq_show(struct seq_file *seq, void *v)
3728 if (v == SEQ_START_TOKEN)
3729 seq_puts(seq, "Inter-| Receive "
3731 " face |bytes packets errs drop fifo frame "
3732 "compressed multicast|bytes packets errs "
3733 "drop fifo colls carrier compressed\n");
3735 dev_seq_printf_stats(seq, v);
3739 static struct softnet_data *softnet_get_online(loff_t *pos)
3741 struct softnet_data *sd = NULL;
3743 while (*pos < nr_cpu_ids)
3744 if (cpu_online(*pos)) {
3745 sd = &per_cpu(softnet_data, *pos);
3752 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3754 return softnet_get_online(pos);
3757 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3760 return softnet_get_online(pos);
3763 static void softnet_seq_stop(struct seq_file *seq, void *v)
3767 static int softnet_seq_show(struct seq_file *seq, void *v)
3769 struct softnet_data *sd = v;
3771 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3772 sd->processed, sd->dropped, sd->time_squeeze, 0,
3773 0, 0, 0, 0, /* was fastroute */
3774 sd->cpu_collision, sd->received_rps);
3778 static const struct seq_operations dev_seq_ops = {
3779 .start = dev_seq_start,
3780 .next = dev_seq_next,
3781 .stop = dev_seq_stop,
3782 .show = dev_seq_show,
3785 static int dev_seq_open(struct inode *inode, struct file *file)
3787 return seq_open_net(inode, file, &dev_seq_ops,
3788 sizeof(struct seq_net_private));
3791 static const struct file_operations dev_seq_fops = {
3792 .owner = THIS_MODULE,
3793 .open = dev_seq_open,
3795 .llseek = seq_lseek,
3796 .release = seq_release_net,
3799 static const struct seq_operations softnet_seq_ops = {
3800 .start = softnet_seq_start,
3801 .next = softnet_seq_next,
3802 .stop = softnet_seq_stop,
3803 .show = softnet_seq_show,
3806 static int softnet_seq_open(struct inode *inode, struct file *file)
3808 return seq_open(file, &softnet_seq_ops);
3811 static const struct file_operations softnet_seq_fops = {
3812 .owner = THIS_MODULE,
3813 .open = softnet_seq_open,
3815 .llseek = seq_lseek,
3816 .release = seq_release,
3819 static void *ptype_get_idx(loff_t pos)
3821 struct packet_type *pt = NULL;
3825 list_for_each_entry_rcu(pt, &ptype_all, list) {
3831 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3832 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3841 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3845 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3848 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3850 struct packet_type *pt;
3851 struct list_head *nxt;
3855 if (v == SEQ_START_TOKEN)
3856 return ptype_get_idx(0);
3859 nxt = pt->list.next;
3860 if (pt->type == htons(ETH_P_ALL)) {
3861 if (nxt != &ptype_all)
3864 nxt = ptype_base[0].next;
3866 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3868 while (nxt == &ptype_base[hash]) {
3869 if (++hash >= PTYPE_HASH_SIZE)
3871 nxt = ptype_base[hash].next;
3874 return list_entry(nxt, struct packet_type, list);
3877 static void ptype_seq_stop(struct seq_file *seq, void *v)
3883 static int ptype_seq_show(struct seq_file *seq, void *v)
3885 struct packet_type *pt = v;
3887 if (v == SEQ_START_TOKEN)
3888 seq_puts(seq, "Type Device Function\n");
3889 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3890 if (pt->type == htons(ETH_P_ALL))
3891 seq_puts(seq, "ALL ");
3893 seq_printf(seq, "%04x", ntohs(pt->type));
3895 seq_printf(seq, " %-8s %pF\n",
3896 pt->dev ? pt->dev->name : "", pt->func);
3902 static const struct seq_operations ptype_seq_ops = {
3903 .start = ptype_seq_start,
3904 .next = ptype_seq_next,
3905 .stop = ptype_seq_stop,
3906 .show = ptype_seq_show,
3909 static int ptype_seq_open(struct inode *inode, struct file *file)
3911 return seq_open_net(inode, file, &ptype_seq_ops,
3912 sizeof(struct seq_net_private));
3915 static const struct file_operations ptype_seq_fops = {
3916 .owner = THIS_MODULE,
3917 .open = ptype_seq_open,
3919 .llseek = seq_lseek,
3920 .release = seq_release_net,
3924 static int __net_init dev_proc_net_init(struct net *net)
3928 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3930 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3932 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3935 if (wext_proc_init(net))
3941 proc_net_remove(net, "ptype");
3943 proc_net_remove(net, "softnet_stat");
3945 proc_net_remove(net, "dev");
3949 static void __net_exit dev_proc_net_exit(struct net *net)
3951 wext_proc_exit(net);
3953 proc_net_remove(net, "ptype");
3954 proc_net_remove(net, "softnet_stat");
3955 proc_net_remove(net, "dev");
3958 static struct pernet_operations __net_initdata dev_proc_ops = {
3959 .init = dev_proc_net_init,
3960 .exit = dev_proc_net_exit,
3963 static int __init dev_proc_init(void)
3965 return register_pernet_subsys(&dev_proc_ops);
3968 #define dev_proc_init() 0
3969 #endif /* CONFIG_PROC_FS */
3973 * netdev_set_master - set up master/slave pair
3974 * @slave: slave device
3975 * @master: new master device
3977 * Changes the master device of the slave. Pass %NULL to break the
3978 * bonding. The caller must hold the RTNL semaphore. On a failure
3979 * a negative errno code is returned. On success the reference counts
3980 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3981 * function returns zero.
3983 int netdev_set_master(struct net_device *slave, struct net_device *master)
3985 struct net_device *old = slave->master;
3995 slave->master = master;
4002 slave->flags |= IFF_SLAVE;
4004 slave->flags &= ~IFF_SLAVE;
4006 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4009 EXPORT_SYMBOL(netdev_set_master);
4011 static void dev_change_rx_flags(struct net_device *dev, int flags)
4013 const struct net_device_ops *ops = dev->netdev_ops;
4015 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4016 ops->ndo_change_rx_flags(dev, flags);
4019 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4021 unsigned short old_flags = dev->flags;
4027 dev->flags |= IFF_PROMISC;
4028 dev->promiscuity += inc;
4029 if (dev->promiscuity == 0) {
4032 * If inc causes overflow, untouch promisc and return error.
4035 dev->flags &= ~IFF_PROMISC;
4037 dev->promiscuity -= inc;
4038 printk(KERN_WARNING "%s: promiscuity touches roof, "
4039 "set promiscuity failed, promiscuity feature "
4040 "of device might be broken.\n", dev->name);
4044 if (dev->flags != old_flags) {
4045 printk(KERN_INFO "device %s %s promiscuous mode\n",
4046 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4048 if (audit_enabled) {
4049 current_uid_gid(&uid, &gid);
4050 audit_log(current->audit_context, GFP_ATOMIC,
4051 AUDIT_ANOM_PROMISCUOUS,
4052 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4053 dev->name, (dev->flags & IFF_PROMISC),
4054 (old_flags & IFF_PROMISC),
4055 audit_get_loginuid(current),
4057 audit_get_sessionid(current));
4060 dev_change_rx_flags(dev, IFF_PROMISC);
4066 * dev_set_promiscuity - update promiscuity count on a device
4070 * Add or remove promiscuity from a device. While the count in the device
4071 * remains above zero the interface remains promiscuous. Once it hits zero
4072 * the device reverts back to normal filtering operation. A negative inc
4073 * value is used to drop promiscuity on the device.
4074 * Return 0 if successful or a negative errno code on error.
4076 int dev_set_promiscuity(struct net_device *dev, int inc)
4078 unsigned short old_flags = dev->flags;
4081 err = __dev_set_promiscuity(dev, inc);
4084 if (dev->flags != old_flags)
4085 dev_set_rx_mode(dev);
4088 EXPORT_SYMBOL(dev_set_promiscuity);
4091 * dev_set_allmulti - update allmulti count on a device
4095 * Add or remove reception of all multicast frames to a device. While the
4096 * count in the device remains above zero the interface remains listening
4097 * to all interfaces. Once it hits zero the device reverts back to normal
4098 * filtering operation. A negative @inc value is used to drop the counter
4099 * when releasing a resource needing all multicasts.
4100 * Return 0 if successful or a negative errno code on error.
4103 int dev_set_allmulti(struct net_device *dev, int inc)
4105 unsigned short old_flags = dev->flags;
4109 dev->flags |= IFF_ALLMULTI;
4110 dev->allmulti += inc;
4111 if (dev->allmulti == 0) {
4114 * If inc causes overflow, untouch allmulti and return error.
4117 dev->flags &= ~IFF_ALLMULTI;
4119 dev->allmulti -= inc;
4120 printk(KERN_WARNING "%s: allmulti touches roof, "
4121 "set allmulti failed, allmulti feature of "
4122 "device might be broken.\n", dev->name);
4126 if (dev->flags ^ old_flags) {
4127 dev_change_rx_flags(dev, IFF_ALLMULTI);
4128 dev_set_rx_mode(dev);
4132 EXPORT_SYMBOL(dev_set_allmulti);
4135 * Upload unicast and multicast address lists to device and
4136 * configure RX filtering. When the device doesn't support unicast
4137 * filtering it is put in promiscuous mode while unicast addresses
4140 void __dev_set_rx_mode(struct net_device *dev)
4142 const struct net_device_ops *ops = dev->netdev_ops;
4144 /* dev_open will call this function so the list will stay sane. */
4145 if (!(dev->flags&IFF_UP))
4148 if (!netif_device_present(dev))
4151 if (ops->ndo_set_rx_mode)
4152 ops->ndo_set_rx_mode(dev);
4154 /* Unicast addresses changes may only happen under the rtnl,
4155 * therefore calling __dev_set_promiscuity here is safe.
4157 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4158 __dev_set_promiscuity(dev, 1);
4159 dev->uc_promisc = 1;
4160 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4161 __dev_set_promiscuity(dev, -1);
4162 dev->uc_promisc = 0;
4165 if (ops->ndo_set_multicast_list)
4166 ops->ndo_set_multicast_list(dev);
4170 void dev_set_rx_mode(struct net_device *dev)
4172 netif_addr_lock_bh(dev);
4173 __dev_set_rx_mode(dev);
4174 netif_addr_unlock_bh(dev);
4178 * dev_get_flags - get flags reported to userspace
4181 * Get the combination of flag bits exported through APIs to userspace.
4183 unsigned dev_get_flags(const struct net_device *dev)
4187 flags = (dev->flags & ~(IFF_PROMISC |
4192 (dev->gflags & (IFF_PROMISC |
4195 if (netif_running(dev)) {
4196 if (netif_oper_up(dev))
4197 flags |= IFF_RUNNING;
4198 if (netif_carrier_ok(dev))
4199 flags |= IFF_LOWER_UP;
4200 if (netif_dormant(dev))
4201 flags |= IFF_DORMANT;
4206 EXPORT_SYMBOL(dev_get_flags);
4208 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4210 int old_flags = dev->flags;
4216 * Set the flags on our device.
4219 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4220 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4222 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4226 * Load in the correct multicast list now the flags have changed.
4229 if ((old_flags ^ flags) & IFF_MULTICAST)
4230 dev_change_rx_flags(dev, IFF_MULTICAST);
4232 dev_set_rx_mode(dev);
4235 * Have we downed the interface. We handle IFF_UP ourselves
4236 * according to user attempts to set it, rather than blindly
4241 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4242 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4245 dev_set_rx_mode(dev);
4248 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4249 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4251 dev->gflags ^= IFF_PROMISC;
4252 dev_set_promiscuity(dev, inc);
4255 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4256 is important. Some (broken) drivers set IFF_PROMISC, when
4257 IFF_ALLMULTI is requested not asking us and not reporting.
4259 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4260 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4262 dev->gflags ^= IFF_ALLMULTI;
4263 dev_set_allmulti(dev, inc);
4269 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4271 unsigned int changes = dev->flags ^ old_flags;
4273 if (changes & IFF_UP) {
4274 if (dev->flags & IFF_UP)
4275 call_netdevice_notifiers(NETDEV_UP, dev);
4277 call_netdevice_notifiers(NETDEV_DOWN, dev);
4280 if (dev->flags & IFF_UP &&
4281 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4282 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4286 * dev_change_flags - change device settings
4288 * @flags: device state flags
4290 * Change settings on device based state flags. The flags are
4291 * in the userspace exported format.
4293 int dev_change_flags(struct net_device *dev, unsigned flags)
4296 int old_flags = dev->flags;
4298 ret = __dev_change_flags(dev, flags);
4302 changes = old_flags ^ dev->flags;
4304 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4306 __dev_notify_flags(dev, old_flags);
4309 EXPORT_SYMBOL(dev_change_flags);
4312 * dev_set_mtu - Change maximum transfer unit
4314 * @new_mtu: new transfer unit
4316 * Change the maximum transfer size of the network device.
4318 int dev_set_mtu(struct net_device *dev, int new_mtu)
4320 const struct net_device_ops *ops = dev->netdev_ops;
4323 if (new_mtu == dev->mtu)
4326 /* MTU must be positive. */
4330 if (!netif_device_present(dev))
4334 if (ops->ndo_change_mtu)
4335 err = ops->ndo_change_mtu(dev, new_mtu);
4339 if (!err && dev->flags & IFF_UP)
4340 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4343 EXPORT_SYMBOL(dev_set_mtu);
4346 * dev_set_mac_address - Change Media Access Control Address
4350 * Change the hardware (MAC) address of the device
4352 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4354 const struct net_device_ops *ops = dev->netdev_ops;
4357 if (!ops->ndo_set_mac_address)
4359 if (sa->sa_family != dev->type)
4361 if (!netif_device_present(dev))
4363 err = ops->ndo_set_mac_address(dev, sa);
4365 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4368 EXPORT_SYMBOL(dev_set_mac_address);
4371 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4373 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4376 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4382 case SIOCGIFFLAGS: /* Get interface flags */
4383 ifr->ifr_flags = (short) dev_get_flags(dev);
4386 case SIOCGIFMETRIC: /* Get the metric on the interface
4387 (currently unused) */
4388 ifr->ifr_metric = 0;
4391 case SIOCGIFMTU: /* Get the MTU of a device */
4392 ifr->ifr_mtu = dev->mtu;
4397 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4399 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4400 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4401 ifr->ifr_hwaddr.sa_family = dev->type;
4409 ifr->ifr_map.mem_start = dev->mem_start;
4410 ifr->ifr_map.mem_end = dev->mem_end;
4411 ifr->ifr_map.base_addr = dev->base_addr;
4412 ifr->ifr_map.irq = dev->irq;
4413 ifr->ifr_map.dma = dev->dma;
4414 ifr->ifr_map.port = dev->if_port;
4418 ifr->ifr_ifindex = dev->ifindex;
4422 ifr->ifr_qlen = dev->tx_queue_len;
4426 /* dev_ioctl() should ensure this case
4438 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4440 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4443 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4444 const struct net_device_ops *ops;
4449 ops = dev->netdev_ops;
4452 case SIOCSIFFLAGS: /* Set interface flags */
4453 return dev_change_flags(dev, ifr->ifr_flags);
4455 case SIOCSIFMETRIC: /* Set the metric on the interface
4456 (currently unused) */
4459 case SIOCSIFMTU: /* Set the MTU of a device */
4460 return dev_set_mtu(dev, ifr->ifr_mtu);
4463 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4465 case SIOCSIFHWBROADCAST:
4466 if (ifr->ifr_hwaddr.sa_family != dev->type)
4468 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4469 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4470 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4474 if (ops->ndo_set_config) {
4475 if (!netif_device_present(dev))
4477 return ops->ndo_set_config(dev, &ifr->ifr_map);
4482 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4483 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4485 if (!netif_device_present(dev))
4487 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4490 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4491 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4493 if (!netif_device_present(dev))
4495 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4498 if (ifr->ifr_qlen < 0)
4500 dev->tx_queue_len = ifr->ifr_qlen;
4504 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4505 return dev_change_name(dev, ifr->ifr_newname);
4508 * Unknown or private ioctl
4511 if ((cmd >= SIOCDEVPRIVATE &&
4512 cmd <= SIOCDEVPRIVATE + 15) ||
4513 cmd == SIOCBONDENSLAVE ||
4514 cmd == SIOCBONDRELEASE ||
4515 cmd == SIOCBONDSETHWADDR ||
4516 cmd == SIOCBONDSLAVEINFOQUERY ||
4517 cmd == SIOCBONDINFOQUERY ||
4518 cmd == SIOCBONDCHANGEACTIVE ||
4519 cmd == SIOCGMIIPHY ||
4520 cmd == SIOCGMIIREG ||
4521 cmd == SIOCSMIIREG ||
4522 cmd == SIOCBRADDIF ||
4523 cmd == SIOCBRDELIF ||
4524 cmd == SIOCSHWTSTAMP ||
4525 cmd == SIOCWANDEV) {
4527 if (ops->ndo_do_ioctl) {
4528 if (netif_device_present(dev))
4529 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4541 * This function handles all "interface"-type I/O control requests. The actual
4542 * 'doing' part of this is dev_ifsioc above.
4546 * dev_ioctl - network device ioctl
4547 * @net: the applicable net namespace
4548 * @cmd: command to issue
4549 * @arg: pointer to a struct ifreq in user space
4551 * Issue ioctl functions to devices. This is normally called by the
4552 * user space syscall interfaces but can sometimes be useful for
4553 * other purposes. The return value is the return from the syscall if
4554 * positive or a negative errno code on error.
4557 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4563 /* One special case: SIOCGIFCONF takes ifconf argument
4564 and requires shared lock, because it sleeps writing
4568 if (cmd == SIOCGIFCONF) {
4570 ret = dev_ifconf(net, (char __user *) arg);
4574 if (cmd == SIOCGIFNAME)
4575 return dev_ifname(net, (struct ifreq __user *)arg);
4577 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4580 ifr.ifr_name[IFNAMSIZ-1] = 0;
4582 colon = strchr(ifr.ifr_name, ':');
4587 * See which interface the caller is talking about.
4592 * These ioctl calls:
4593 * - can be done by all.
4594 * - atomic and do not require locking.
4605 dev_load(net, ifr.ifr_name);
4607 ret = dev_ifsioc_locked(net, &ifr, cmd);
4612 if (copy_to_user(arg, &ifr,
4613 sizeof(struct ifreq)))
4619 dev_load(net, ifr.ifr_name);
4621 ret = dev_ethtool(net, &ifr);
4626 if (copy_to_user(arg, &ifr,
4627 sizeof(struct ifreq)))
4633 * These ioctl calls:
4634 * - require superuser power.
4635 * - require strict serialization.
4641 if (!capable(CAP_NET_ADMIN))
4643 dev_load(net, ifr.ifr_name);
4645 ret = dev_ifsioc(net, &ifr, cmd);
4650 if (copy_to_user(arg, &ifr,
4651 sizeof(struct ifreq)))
4657 * These ioctl calls:
4658 * - require superuser power.
4659 * - require strict serialization.
4660 * - do not return a value
4670 case SIOCSIFHWBROADCAST:
4673 case SIOCBONDENSLAVE:
4674 case SIOCBONDRELEASE:
4675 case SIOCBONDSETHWADDR:
4676 case SIOCBONDCHANGEACTIVE:
4680 if (!capable(CAP_NET_ADMIN))
4683 case SIOCBONDSLAVEINFOQUERY:
4684 case SIOCBONDINFOQUERY:
4685 dev_load(net, ifr.ifr_name);
4687 ret = dev_ifsioc(net, &ifr, cmd);
4692 /* Get the per device memory space. We can add this but
4693 * currently do not support it */
4695 /* Set the per device memory buffer space.
4696 * Not applicable in our case */
4701 * Unknown or private ioctl.
4704 if (cmd == SIOCWANDEV ||
4705 (cmd >= SIOCDEVPRIVATE &&
4706 cmd <= SIOCDEVPRIVATE + 15)) {
4707 dev_load(net, ifr.ifr_name);
4709 ret = dev_ifsioc(net, &ifr, cmd);
4711 if (!ret && copy_to_user(arg, &ifr,
4712 sizeof(struct ifreq)))
4716 /* Take care of Wireless Extensions */
4717 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4718 return wext_handle_ioctl(net, &ifr, cmd, arg);
4725 * dev_new_index - allocate an ifindex
4726 * @net: the applicable net namespace
4728 * Returns a suitable unique value for a new device interface
4729 * number. The caller must hold the rtnl semaphore or the
4730 * dev_base_lock to be sure it remains unique.
4732 static int dev_new_index(struct net *net)
4738 if (!__dev_get_by_index(net, ifindex))
4743 /* Delayed registration/unregisteration */
4744 static LIST_HEAD(net_todo_list);
4746 static void net_set_todo(struct net_device *dev)
4748 list_add_tail(&dev->todo_list, &net_todo_list);
4751 static void rollback_registered_many(struct list_head *head)
4753 struct net_device *dev, *tmp;
4755 BUG_ON(dev_boot_phase);
4758 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4759 /* Some devices call without registering
4760 * for initialization unwind. Remove those
4761 * devices and proceed with the remaining.
4763 if (dev->reg_state == NETREG_UNINITIALIZED) {
4764 pr_debug("unregister_netdevice: device %s/%p never "
4765 "was registered\n", dev->name, dev);
4768 list_del(&dev->unreg_list);
4772 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4774 /* If device is running, close it first. */
4777 /* And unlink it from device chain. */
4778 unlist_netdevice(dev);
4780 dev->reg_state = NETREG_UNREGISTERING;
4785 list_for_each_entry(dev, head, unreg_list) {
4786 /* Shutdown queueing discipline. */
4790 /* Notify protocols, that we are about to destroy
4791 this device. They should clean all the things.
4793 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4795 if (!dev->rtnl_link_ops ||
4796 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4797 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4800 * Flush the unicast and multicast chains
4805 if (dev->netdev_ops->ndo_uninit)
4806 dev->netdev_ops->ndo_uninit(dev);
4808 /* Notifier chain MUST detach us from master device. */
4809 WARN_ON(dev->master);
4811 /* Remove entries from kobject tree */
4812 netdev_unregister_kobject(dev);
4815 /* Process any work delayed until the end of the batch */
4816 dev = list_first_entry(head, struct net_device, unreg_list);
4817 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4821 list_for_each_entry(dev, head, unreg_list)
4825 static void rollback_registered(struct net_device *dev)
4829 list_add(&dev->unreg_list, &single);
4830 rollback_registered_many(&single);
4833 static void __netdev_init_queue_locks_one(struct net_device *dev,
4834 struct netdev_queue *dev_queue,
4837 spin_lock_init(&dev_queue->_xmit_lock);
4838 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4839 dev_queue->xmit_lock_owner = -1;
4842 static void netdev_init_queue_locks(struct net_device *dev)
4844 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4845 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4848 unsigned long netdev_fix_features(unsigned long features, const char *name)
4850 /* Fix illegal SG+CSUM combinations. */
4851 if ((features & NETIF_F_SG) &&
4852 !(features & NETIF_F_ALL_CSUM)) {
4854 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4855 "checksum feature.\n", name);
4856 features &= ~NETIF_F_SG;
4859 /* TSO requires that SG is present as well. */
4860 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4862 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4863 "SG feature.\n", name);
4864 features &= ~NETIF_F_TSO;
4867 if (features & NETIF_F_UFO) {
4868 if (!(features & NETIF_F_GEN_CSUM)) {
4870 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4871 "since no NETIF_F_HW_CSUM feature.\n",
4873 features &= ~NETIF_F_UFO;
4876 if (!(features & NETIF_F_SG)) {
4878 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4879 "since no NETIF_F_SG feature.\n", name);
4880 features &= ~NETIF_F_UFO;
4886 EXPORT_SYMBOL(netdev_fix_features);
4889 * netif_stacked_transfer_operstate - transfer operstate
4890 * @rootdev: the root or lower level device to transfer state from
4891 * @dev: the device to transfer operstate to
4893 * Transfer operational state from root to device. This is normally
4894 * called when a stacking relationship exists between the root
4895 * device and the device(a leaf device).
4897 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4898 struct net_device *dev)
4900 if (rootdev->operstate == IF_OPER_DORMANT)
4901 netif_dormant_on(dev);
4903 netif_dormant_off(dev);
4905 if (netif_carrier_ok(rootdev)) {
4906 if (!netif_carrier_ok(dev))
4907 netif_carrier_on(dev);
4909 if (netif_carrier_ok(dev))
4910 netif_carrier_off(dev);
4913 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4916 * register_netdevice - register a network device
4917 * @dev: device to register
4919 * Take a completed network device structure and add it to the kernel
4920 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4921 * chain. 0 is returned on success. A negative errno code is returned
4922 * on a failure to set up the device, or if the name is a duplicate.
4924 * Callers must hold the rtnl semaphore. You may want
4925 * register_netdev() instead of this.
4928 * The locking appears insufficient to guarantee two parallel registers
4929 * will not get the same name.
4932 int register_netdevice(struct net_device *dev)
4935 struct net *net = dev_net(dev);
4937 BUG_ON(dev_boot_phase);
4942 /* When net_device's are persistent, this will be fatal. */
4943 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4946 spin_lock_init(&dev->addr_list_lock);
4947 netdev_set_addr_lockdep_class(dev);
4948 netdev_init_queue_locks(dev);
4953 if (!dev->num_rx_queues) {
4955 * Allocate a single RX queue if driver never called
4959 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
4965 dev->_rx->first = dev->_rx;
4966 atomic_set(&dev->_rx->count, 1);
4967 dev->num_rx_queues = 1;
4970 /* Init, if this function is available */
4971 if (dev->netdev_ops->ndo_init) {
4972 ret = dev->netdev_ops->ndo_init(dev);
4980 ret = dev_get_valid_name(dev, dev->name, 0);
4984 dev->ifindex = dev_new_index(net);
4985 if (dev->iflink == -1)
4986 dev->iflink = dev->ifindex;
4988 /* Fix illegal checksum combinations */
4989 if ((dev->features & NETIF_F_HW_CSUM) &&
4990 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4991 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4993 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4996 if ((dev->features & NETIF_F_NO_CSUM) &&
4997 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4998 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
5000 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5003 dev->features = netdev_fix_features(dev->features, dev->name);
5005 /* Enable software GSO if SG is supported. */
5006 if (dev->features & NETIF_F_SG)
5007 dev->features |= NETIF_F_GSO;
5009 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5010 ret = notifier_to_errno(ret);
5014 ret = netdev_register_kobject(dev);
5017 dev->reg_state = NETREG_REGISTERED;
5020 * Default initial state at registry is that the
5021 * device is present.
5024 set_bit(__LINK_STATE_PRESENT, &dev->state);
5026 dev_init_scheduler(dev);
5028 list_netdevice(dev);
5030 /* Notify protocols, that a new device appeared. */
5031 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5032 ret = notifier_to_errno(ret);
5034 rollback_registered(dev);
5035 dev->reg_state = NETREG_UNREGISTERED;
5038 * Prevent userspace races by waiting until the network
5039 * device is fully setup before sending notifications.
5041 if (!dev->rtnl_link_ops ||
5042 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5043 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5049 if (dev->netdev_ops->ndo_uninit)
5050 dev->netdev_ops->ndo_uninit(dev);
5053 EXPORT_SYMBOL(register_netdevice);
5056 * init_dummy_netdev - init a dummy network device for NAPI
5057 * @dev: device to init
5059 * This takes a network device structure and initialize the minimum
5060 * amount of fields so it can be used to schedule NAPI polls without
5061 * registering a full blown interface. This is to be used by drivers
5062 * that need to tie several hardware interfaces to a single NAPI
5063 * poll scheduler due to HW limitations.
5065 int init_dummy_netdev(struct net_device *dev)
5067 /* Clear everything. Note we don't initialize spinlocks
5068 * are they aren't supposed to be taken by any of the
5069 * NAPI code and this dummy netdev is supposed to be
5070 * only ever used for NAPI polls
5072 memset(dev, 0, sizeof(struct net_device));
5074 /* make sure we BUG if trying to hit standard
5075 * register/unregister code path
5077 dev->reg_state = NETREG_DUMMY;
5079 /* initialize the ref count */
5080 atomic_set(&dev->refcnt, 1);
5082 /* NAPI wants this */
5083 INIT_LIST_HEAD(&dev->napi_list);
5085 /* a dummy interface is started by default */
5086 set_bit(__LINK_STATE_PRESENT, &dev->state);
5087 set_bit(__LINK_STATE_START, &dev->state);
5091 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5095 * register_netdev - register a network device
5096 * @dev: device to register
5098 * Take a completed network device structure and add it to the kernel
5099 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5100 * chain. 0 is returned on success. A negative errno code is returned
5101 * on a failure to set up the device, or if the name is a duplicate.
5103 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5104 * and expands the device name if you passed a format string to
5107 int register_netdev(struct net_device *dev)
5114 * If the name is a format string the caller wants us to do a
5117 if (strchr(dev->name, '%')) {
5118 err = dev_alloc_name(dev, dev->name);
5123 err = register_netdevice(dev);
5128 EXPORT_SYMBOL(register_netdev);
5131 * netdev_wait_allrefs - wait until all references are gone.
5133 * This is called when unregistering network devices.
5135 * Any protocol or device that holds a reference should register
5136 * for netdevice notification, and cleanup and put back the
5137 * reference if they receive an UNREGISTER event.
5138 * We can get stuck here if buggy protocols don't correctly
5141 static void netdev_wait_allrefs(struct net_device *dev)
5143 unsigned long rebroadcast_time, warning_time;
5145 linkwatch_forget_dev(dev);
5147 rebroadcast_time = warning_time = jiffies;
5148 while (atomic_read(&dev->refcnt) != 0) {
5149 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5152 /* Rebroadcast unregister notification */
5153 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5154 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5155 * should have already handle it the first time */
5157 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5159 /* We must not have linkwatch events
5160 * pending on unregister. If this
5161 * happens, we simply run the queue
5162 * unscheduled, resulting in a noop
5165 linkwatch_run_queue();
5170 rebroadcast_time = jiffies;
5175 if (time_after(jiffies, warning_time + 10 * HZ)) {
5176 printk(KERN_EMERG "unregister_netdevice: "
5177 "waiting for %s to become free. Usage "
5179 dev->name, atomic_read(&dev->refcnt));
5180 warning_time = jiffies;
5189 * register_netdevice(x1);
5190 * register_netdevice(x2);
5192 * unregister_netdevice(y1);
5193 * unregister_netdevice(y2);
5199 * We are invoked by rtnl_unlock().
5200 * This allows us to deal with problems:
5201 * 1) We can delete sysfs objects which invoke hotplug
5202 * without deadlocking with linkwatch via keventd.
5203 * 2) Since we run with the RTNL semaphore not held, we can sleep
5204 * safely in order to wait for the netdev refcnt to drop to zero.
5206 * We must not return until all unregister events added during
5207 * the interval the lock was held have been completed.
5209 void netdev_run_todo(void)
5211 struct list_head list;
5213 /* Snapshot list, allow later requests */
5214 list_replace_init(&net_todo_list, &list);
5218 while (!list_empty(&list)) {
5219 struct net_device *dev
5220 = list_first_entry(&list, struct net_device, todo_list);
5221 list_del(&dev->todo_list);
5223 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5224 printk(KERN_ERR "network todo '%s' but state %d\n",
5225 dev->name, dev->reg_state);
5230 dev->reg_state = NETREG_UNREGISTERED;
5232 on_each_cpu(flush_backlog, dev, 1);
5234 netdev_wait_allrefs(dev);
5237 BUG_ON(atomic_read(&dev->refcnt));
5238 WARN_ON(dev->ip_ptr);
5239 WARN_ON(dev->ip6_ptr);
5240 WARN_ON(dev->dn_ptr);
5242 if (dev->destructor)
5243 dev->destructor(dev);
5245 /* Free network device */
5246 kobject_put(&dev->dev.kobj);
5251 * dev_txq_stats_fold - fold tx_queues stats
5252 * @dev: device to get statistics from
5253 * @stats: struct net_device_stats to hold results
5255 void dev_txq_stats_fold(const struct net_device *dev,
5256 struct net_device_stats *stats)
5258 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5260 struct netdev_queue *txq;
5262 for (i = 0; i < dev->num_tx_queues; i++) {
5263 txq = netdev_get_tx_queue(dev, i);
5264 tx_bytes += txq->tx_bytes;
5265 tx_packets += txq->tx_packets;
5266 tx_dropped += txq->tx_dropped;
5268 if (tx_bytes || tx_packets || tx_dropped) {
5269 stats->tx_bytes = tx_bytes;
5270 stats->tx_packets = tx_packets;
5271 stats->tx_dropped = tx_dropped;
5274 EXPORT_SYMBOL(dev_txq_stats_fold);
5277 * dev_get_stats - get network device statistics
5278 * @dev: device to get statistics from
5280 * Get network statistics from device. The device driver may provide
5281 * its own method by setting dev->netdev_ops->get_stats; otherwise
5282 * the internal statistics structure is used.
5284 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5286 const struct net_device_ops *ops = dev->netdev_ops;
5288 if (ops->ndo_get_stats)
5289 return ops->ndo_get_stats(dev);
5291 dev_txq_stats_fold(dev, &dev->stats);
5294 EXPORT_SYMBOL(dev_get_stats);
5296 static void netdev_init_one_queue(struct net_device *dev,
5297 struct netdev_queue *queue,
5303 static void netdev_init_queues(struct net_device *dev)
5305 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5306 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5307 spin_lock_init(&dev->tx_global_lock);
5311 * alloc_netdev_mq - allocate network device
5312 * @sizeof_priv: size of private data to allocate space for
5313 * @name: device name format string
5314 * @setup: callback to initialize device
5315 * @queue_count: the number of subqueues to allocate
5317 * Allocates a struct net_device with private data area for driver use
5318 * and performs basic initialization. Also allocates subquue structs
5319 * for each queue on the device at the end of the netdevice.
5321 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5322 void (*setup)(struct net_device *), unsigned int queue_count)
5324 struct netdev_queue *tx;
5325 struct net_device *dev;
5327 struct net_device *p;
5329 struct netdev_rx_queue *rx;
5333 BUG_ON(strlen(name) >= sizeof(dev->name));
5335 alloc_size = sizeof(struct net_device);
5337 /* ensure 32-byte alignment of private area */
5338 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5339 alloc_size += sizeof_priv;
5341 /* ensure 32-byte alignment of whole construct */
5342 alloc_size += NETDEV_ALIGN - 1;
5344 p = kzalloc(alloc_size, GFP_KERNEL);
5346 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5350 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5352 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5358 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5360 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5365 atomic_set(&rx->count, queue_count);
5368 * Set a pointer to first element in the array which holds the
5371 for (i = 0; i < queue_count; i++)
5375 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5376 dev->padded = (char *)dev - (char *)p;
5378 if (dev_addr_init(dev))
5384 dev_net_set(dev, &init_net);
5387 dev->num_tx_queues = queue_count;
5388 dev->real_num_tx_queues = queue_count;
5392 dev->num_rx_queues = queue_count;
5395 dev->gso_max_size = GSO_MAX_SIZE;
5397 netdev_init_queues(dev);
5399 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5400 dev->ethtool_ntuple_list.count = 0;
5401 INIT_LIST_HEAD(&dev->napi_list);
5402 INIT_LIST_HEAD(&dev->unreg_list);
5403 INIT_LIST_HEAD(&dev->link_watch_list);
5404 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5406 strcpy(dev->name, name);
5419 EXPORT_SYMBOL(alloc_netdev_mq);
5422 * free_netdev - free network device
5425 * This function does the last stage of destroying an allocated device
5426 * interface. The reference to the device object is released.
5427 * If this is the last reference then it will be freed.
5429 void free_netdev(struct net_device *dev)
5431 struct napi_struct *p, *n;
5433 release_net(dev_net(dev));
5437 /* Flush device addresses */
5438 dev_addr_flush(dev);
5440 /* Clear ethtool n-tuple list */
5441 ethtool_ntuple_flush(dev);
5443 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5446 /* Compatibility with error handling in drivers */
5447 if (dev->reg_state == NETREG_UNINITIALIZED) {
5448 kfree((char *)dev - dev->padded);
5452 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5453 dev->reg_state = NETREG_RELEASED;
5455 /* will free via device release */
5456 put_device(&dev->dev);
5458 EXPORT_SYMBOL(free_netdev);
5461 * synchronize_net - Synchronize with packet receive processing
5463 * Wait for packets currently being received to be done.
5464 * Does not block later packets from starting.
5466 void synchronize_net(void)
5471 EXPORT_SYMBOL(synchronize_net);
5474 * unregister_netdevice_queue - remove device from the kernel
5478 * This function shuts down a device interface and removes it
5479 * from the kernel tables.
5480 * If head not NULL, device is queued to be unregistered later.
5482 * Callers must hold the rtnl semaphore. You may want
5483 * unregister_netdev() instead of this.
5486 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5491 list_move_tail(&dev->unreg_list, head);
5493 rollback_registered(dev);
5494 /* Finish processing unregister after unlock */
5498 EXPORT_SYMBOL(unregister_netdevice_queue);
5501 * unregister_netdevice_many - unregister many devices
5502 * @head: list of devices
5504 void unregister_netdevice_many(struct list_head *head)
5506 struct net_device *dev;
5508 if (!list_empty(head)) {
5509 rollback_registered_many(head);
5510 list_for_each_entry(dev, head, unreg_list)
5514 EXPORT_SYMBOL(unregister_netdevice_many);
5517 * unregister_netdev - remove device from the kernel
5520 * This function shuts down a device interface and removes it
5521 * from the kernel tables.
5523 * This is just a wrapper for unregister_netdevice that takes
5524 * the rtnl semaphore. In general you want to use this and not
5525 * unregister_netdevice.
5527 void unregister_netdev(struct net_device *dev)
5530 unregister_netdevice(dev);
5533 EXPORT_SYMBOL(unregister_netdev);
5536 * dev_change_net_namespace - move device to different nethost namespace
5538 * @net: network namespace
5539 * @pat: If not NULL name pattern to try if the current device name
5540 * is already taken in the destination network namespace.
5542 * This function shuts down a device interface and moves it
5543 * to a new network namespace. On success 0 is returned, on
5544 * a failure a netagive errno code is returned.
5546 * Callers must hold the rtnl semaphore.
5549 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5555 /* Don't allow namespace local devices to be moved. */
5557 if (dev->features & NETIF_F_NETNS_LOCAL)
5560 /* Ensure the device has been registrered */
5562 if (dev->reg_state != NETREG_REGISTERED)
5565 /* Get out if there is nothing todo */
5567 if (net_eq(dev_net(dev), net))
5570 /* Pick the destination device name, and ensure
5571 * we can use it in the destination network namespace.
5574 if (__dev_get_by_name(net, dev->name)) {
5575 /* We get here if we can't use the current device name */
5578 if (dev_get_valid_name(dev, pat, 1))
5583 * And now a mini version of register_netdevice unregister_netdevice.
5586 /* If device is running close it first. */
5589 /* And unlink it from device chain */
5591 unlist_netdevice(dev);
5595 /* Shutdown queueing discipline. */
5598 /* Notify protocols, that we are about to destroy
5599 this device. They should clean all the things.
5601 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5602 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5605 * Flush the unicast and multicast chains
5610 /* Actually switch the network namespace */
5611 dev_net_set(dev, net);
5613 /* If there is an ifindex conflict assign a new one */
5614 if (__dev_get_by_index(net, dev->ifindex)) {
5615 int iflink = (dev->iflink == dev->ifindex);
5616 dev->ifindex = dev_new_index(net);
5618 dev->iflink = dev->ifindex;
5621 /* Fixup kobjects */
5622 err = device_rename(&dev->dev, dev->name);
5625 /* Add the device back in the hashes */
5626 list_netdevice(dev);
5628 /* Notify protocols, that a new device appeared. */
5629 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5632 * Prevent userspace races by waiting until the network
5633 * device is fully setup before sending notifications.
5635 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5642 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5644 static int dev_cpu_callback(struct notifier_block *nfb,
5645 unsigned long action,
5648 struct sk_buff **list_skb;
5649 struct sk_buff *skb;
5650 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5651 struct softnet_data *sd, *oldsd;
5653 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5656 local_irq_disable();
5657 cpu = smp_processor_id();
5658 sd = &per_cpu(softnet_data, cpu);
5659 oldsd = &per_cpu(softnet_data, oldcpu);
5661 /* Find end of our completion_queue. */
5662 list_skb = &sd->completion_queue;
5664 list_skb = &(*list_skb)->next;
5665 /* Append completion queue from offline CPU. */
5666 *list_skb = oldsd->completion_queue;
5667 oldsd->completion_queue = NULL;
5669 /* Append output queue from offline CPU. */
5670 if (oldsd->output_queue) {
5671 *sd->output_queue_tailp = oldsd->output_queue;
5672 sd->output_queue_tailp = oldsd->output_queue_tailp;
5673 oldsd->output_queue = NULL;
5674 oldsd->output_queue_tailp = &oldsd->output_queue;
5677 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5680 /* Process offline CPU's input_pkt_queue */
5681 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
5683 input_queue_head_incr(oldsd);
5685 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5687 input_queue_head_incr(oldsd);
5695 * netdev_increment_features - increment feature set by one
5696 * @all: current feature set
5697 * @one: new feature set
5698 * @mask: mask feature set
5700 * Computes a new feature set after adding a device with feature set
5701 * @one to the master device with current feature set @all. Will not
5702 * enable anything that is off in @mask. Returns the new feature set.
5704 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5707 /* If device needs checksumming, downgrade to it. */
5708 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5709 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5710 else if (mask & NETIF_F_ALL_CSUM) {
5711 /* If one device supports v4/v6 checksumming, set for all. */
5712 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5713 !(all & NETIF_F_GEN_CSUM)) {
5714 all &= ~NETIF_F_ALL_CSUM;
5715 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5718 /* If one device supports hw checksumming, set for all. */
5719 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5720 all &= ~NETIF_F_ALL_CSUM;
5721 all |= NETIF_F_HW_CSUM;
5725 one |= NETIF_F_ALL_CSUM;
5727 one |= all & NETIF_F_ONE_FOR_ALL;
5728 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5729 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5733 EXPORT_SYMBOL(netdev_increment_features);
5735 static struct hlist_head *netdev_create_hash(void)
5738 struct hlist_head *hash;
5740 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5742 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5743 INIT_HLIST_HEAD(&hash[i]);
5748 /* Initialize per network namespace state */
5749 static int __net_init netdev_init(struct net *net)
5751 INIT_LIST_HEAD(&net->dev_base_head);
5753 net->dev_name_head = netdev_create_hash();
5754 if (net->dev_name_head == NULL)
5757 net->dev_index_head = netdev_create_hash();
5758 if (net->dev_index_head == NULL)
5764 kfree(net->dev_name_head);
5770 * netdev_drivername - network driver for the device
5771 * @dev: network device
5772 * @buffer: buffer for resulting name
5773 * @len: size of buffer
5775 * Determine network driver for device.
5777 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5779 const struct device_driver *driver;
5780 const struct device *parent;
5782 if (len <= 0 || !buffer)
5786 parent = dev->dev.parent;
5791 driver = parent->driver;
5792 if (driver && driver->name)
5793 strlcpy(buffer, driver->name, len);
5797 static void __net_exit netdev_exit(struct net *net)
5799 kfree(net->dev_name_head);
5800 kfree(net->dev_index_head);
5803 static struct pernet_operations __net_initdata netdev_net_ops = {
5804 .init = netdev_init,
5805 .exit = netdev_exit,
5808 static void __net_exit default_device_exit(struct net *net)
5810 struct net_device *dev, *aux;
5812 * Push all migratable network devices back to the
5813 * initial network namespace
5816 for_each_netdev_safe(net, dev, aux) {
5818 char fb_name[IFNAMSIZ];
5820 /* Ignore unmoveable devices (i.e. loopback) */
5821 if (dev->features & NETIF_F_NETNS_LOCAL)
5824 /* Leave virtual devices for the generic cleanup */
5825 if (dev->rtnl_link_ops)
5828 /* Push remaing network devices to init_net */
5829 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5830 err = dev_change_net_namespace(dev, &init_net, fb_name);
5832 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5833 __func__, dev->name, err);
5840 static void __net_exit default_device_exit_batch(struct list_head *net_list)
5842 /* At exit all network devices most be removed from a network
5843 * namespace. Do this in the reverse order of registeration.
5844 * Do this across as many network namespaces as possible to
5845 * improve batching efficiency.
5847 struct net_device *dev;
5849 LIST_HEAD(dev_kill_list);
5852 list_for_each_entry(net, net_list, exit_list) {
5853 for_each_netdev_reverse(net, dev) {
5854 if (dev->rtnl_link_ops)
5855 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
5857 unregister_netdevice_queue(dev, &dev_kill_list);
5860 unregister_netdevice_many(&dev_kill_list);
5864 static struct pernet_operations __net_initdata default_device_ops = {
5865 .exit = default_device_exit,
5866 .exit_batch = default_device_exit_batch,
5870 * Initialize the DEV module. At boot time this walks the device list and
5871 * unhooks any devices that fail to initialise (normally hardware not
5872 * present) and leaves us with a valid list of present and active devices.
5877 * This is called single threaded during boot, so no need
5878 * to take the rtnl semaphore.
5880 static int __init net_dev_init(void)
5882 int i, rc = -ENOMEM;
5884 BUG_ON(!dev_boot_phase);
5886 if (dev_proc_init())
5889 if (netdev_kobject_init())
5892 INIT_LIST_HEAD(&ptype_all);
5893 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5894 INIT_LIST_HEAD(&ptype_base[i]);
5896 if (register_pernet_subsys(&netdev_net_ops))
5900 * Initialise the packet receive queues.
5903 for_each_possible_cpu(i) {
5904 struct softnet_data *sd = &per_cpu(softnet_data, i);
5906 memset(sd, 0, sizeof(*sd));
5907 skb_queue_head_init(&sd->input_pkt_queue);
5908 skb_queue_head_init(&sd->process_queue);
5909 sd->completion_queue = NULL;
5910 INIT_LIST_HEAD(&sd->poll_list);
5911 sd->output_queue = NULL;
5912 sd->output_queue_tailp = &sd->output_queue;
5914 sd->csd.func = rps_trigger_softirq;
5920 sd->backlog.poll = process_backlog;
5921 sd->backlog.weight = weight_p;
5922 sd->backlog.gro_list = NULL;
5923 sd->backlog.gro_count = 0;
5928 /* The loopback device is special if any other network devices
5929 * is present in a network namespace the loopback device must
5930 * be present. Since we now dynamically allocate and free the
5931 * loopback device ensure this invariant is maintained by
5932 * keeping the loopback device as the first device on the
5933 * list of network devices. Ensuring the loopback devices
5934 * is the first device that appears and the last network device
5937 if (register_pernet_device(&loopback_net_ops))
5940 if (register_pernet_device(&default_device_ops))
5943 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5944 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5946 hotcpu_notifier(dev_cpu_callback, 0);
5954 subsys_initcall(net_dev_init);
5956 static int __init initialize_hashrnd(void)
5958 get_random_bytes(&hashrnd, sizeof(hashrnd));
5962 late_initcall_sync(initialize_hashrnd);