2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
104 #include <linux/if_bridge.h>
105 #include <linux/if_macvlan.h>
107 #include <net/pkt_sched.h>
108 #include <net/checksum.h>
109 #include <net/xfrm.h>
110 #include <linux/highmem.h>
111 #include <linux/init.h>
112 #include <linux/kmod.h>
113 #include <linux/module.h>
114 #include <linux/netpoll.h>
115 #include <linux/rcupdate.h>
116 #include <linux/delay.h>
117 #include <net/wext.h>
118 #include <net/iw_handler.h>
119 #include <asm/current.h>
120 #include <linux/audit.h>
121 #include <linux/dmaengine.h>
122 #include <linux/err.h>
123 #include <linux/ctype.h>
124 #include <linux/if_arp.h>
125 #include <linux/if_vlan.h>
126 #include <linux/ip.h>
128 #include <linux/ipv6.h>
129 #include <linux/in.h>
130 #include <linux/jhash.h>
131 #include <linux/random.h>
132 #include <trace/events/napi.h>
133 #include <linux/pci.h>
135 #include "net-sysfs.h"
137 /* Instead of increasing this, you should create a hash table. */
138 #define MAX_GRO_SKBS 8
140 /* This should be increased if a protocol with a bigger head is added. */
141 #define GRO_MAX_HEAD (MAX_HEADER + 128)
144 * The list of packet types we will receive (as opposed to discard)
145 * and the routines to invoke.
147 * Why 16. Because with 16 the only overlap we get on a hash of the
148 * low nibble of the protocol value is RARP/SNAP/X.25.
150 * NOTE: That is no longer true with the addition of VLAN tags. Not
151 * sure which should go first, but I bet it won't make much
152 * difference if we are running VLANs. The good news is that
153 * this protocol won't be in the list unless compiled in, so
154 * the average user (w/out VLANs) will not be adversely affected.
171 #define PTYPE_HASH_SIZE (16)
172 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
174 static DEFINE_SPINLOCK(ptype_lock);
175 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
176 static struct list_head ptype_all __read_mostly; /* Taps */
179 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
182 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
184 * Writers must hold the rtnl semaphore while they loop through the
185 * dev_base_head list, and hold dev_base_lock for writing when they do the
186 * actual updates. This allows pure readers to access the list even
187 * while a writer is preparing to update it.
189 * To put it another way, dev_base_lock is held for writing only to
190 * protect against pure readers; the rtnl semaphore provides the
191 * protection against other writers.
193 * See, for example usages, register_netdevice() and
194 * unregister_netdevice(), which must be called with the rtnl
197 DEFINE_RWLOCK(dev_base_lock);
198 EXPORT_SYMBOL(dev_base_lock);
200 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
202 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
203 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
206 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
208 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
211 static inline void rps_lock(struct softnet_data *sd)
214 spin_lock(&sd->input_pkt_queue.lock);
218 static inline void rps_unlock(struct softnet_data *sd)
221 spin_unlock(&sd->input_pkt_queue.lock);
225 /* Device list insertion */
226 static int list_netdevice(struct net_device *dev)
228 struct net *net = dev_net(dev);
232 write_lock_bh(&dev_base_lock);
233 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
234 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
235 hlist_add_head_rcu(&dev->index_hlist,
236 dev_index_hash(net, dev->ifindex));
237 write_unlock_bh(&dev_base_lock);
241 /* Device list removal
242 * caller must respect a RCU grace period before freeing/reusing dev
244 static void unlist_netdevice(struct net_device *dev)
248 /* Unlink dev from the device chain */
249 write_lock_bh(&dev_base_lock);
250 list_del_rcu(&dev->dev_list);
251 hlist_del_rcu(&dev->name_hlist);
252 hlist_del_rcu(&dev->index_hlist);
253 write_unlock_bh(&dev_base_lock);
260 static RAW_NOTIFIER_HEAD(netdev_chain);
263 * Device drivers call our routines to queue packets here. We empty the
264 * queue in the local softnet handler.
267 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
268 EXPORT_PER_CPU_SYMBOL(softnet_data);
270 #ifdef CONFIG_LOCKDEP
272 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
273 * according to dev->type
275 static const unsigned short netdev_lock_type[] =
276 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
277 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
278 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
279 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
280 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
281 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
282 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
283 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
284 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
285 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
286 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
287 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
288 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
289 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
290 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
291 ARPHRD_VOID, ARPHRD_NONE};
293 static const char *const netdev_lock_name[] =
294 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
295 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
296 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
297 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
298 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
299 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
300 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
301 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
302 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
303 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
304 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
305 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
306 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
307 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
308 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
309 "_xmit_VOID", "_xmit_NONE"};
311 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
312 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
314 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
318 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
319 if (netdev_lock_type[i] == dev_type)
321 /* the last key is used by default */
322 return ARRAY_SIZE(netdev_lock_type) - 1;
325 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
326 unsigned short dev_type)
330 i = netdev_lock_pos(dev_type);
331 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
332 netdev_lock_name[i]);
335 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
339 i = netdev_lock_pos(dev->type);
340 lockdep_set_class_and_name(&dev->addr_list_lock,
341 &netdev_addr_lock_key[i],
342 netdev_lock_name[i]);
345 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
346 unsigned short dev_type)
349 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
354 /*******************************************************************************
356 Protocol management and registration routines
358 *******************************************************************************/
361 * Add a protocol ID to the list. Now that the input handler is
362 * smarter we can dispense with all the messy stuff that used to be
365 * BEWARE!!! Protocol handlers, mangling input packets,
366 * MUST BE last in hash buckets and checking protocol handlers
367 * MUST start from promiscuous ptype_all chain in net_bh.
368 * It is true now, do not change it.
369 * Explanation follows: if protocol handler, mangling packet, will
370 * be the first on list, it is not able to sense, that packet
371 * is cloned and should be copied-on-write, so that it will
372 * change it and subsequent readers will get broken packet.
377 * dev_add_pack - add packet handler
378 * @pt: packet type declaration
380 * Add a protocol handler to the networking stack. The passed &packet_type
381 * is linked into kernel lists and may not be freed until it has been
382 * removed from the kernel lists.
384 * This call does not sleep therefore it can not
385 * guarantee all CPU's that are in middle of receiving packets
386 * will see the new packet type (until the next received packet).
389 void dev_add_pack(struct packet_type *pt)
393 spin_lock_bh(&ptype_lock);
394 if (pt->type == htons(ETH_P_ALL))
395 list_add_rcu(&pt->list, &ptype_all);
397 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
398 list_add_rcu(&pt->list, &ptype_base[hash]);
400 spin_unlock_bh(&ptype_lock);
402 EXPORT_SYMBOL(dev_add_pack);
405 * __dev_remove_pack - remove packet handler
406 * @pt: packet type declaration
408 * Remove a protocol handler that was previously added to the kernel
409 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
410 * from the kernel lists and can be freed or reused once this function
413 * The packet type might still be in use by receivers
414 * and must not be freed until after all the CPU's have gone
415 * through a quiescent state.
417 void __dev_remove_pack(struct packet_type *pt)
419 struct list_head *head;
420 struct packet_type *pt1;
422 spin_lock_bh(&ptype_lock);
424 if (pt->type == htons(ETH_P_ALL))
427 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
429 list_for_each_entry(pt1, head, list) {
431 list_del_rcu(&pt->list);
436 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
438 spin_unlock_bh(&ptype_lock);
440 EXPORT_SYMBOL(__dev_remove_pack);
443 * dev_remove_pack - remove packet handler
444 * @pt: packet type declaration
446 * Remove a protocol handler that was previously added to the kernel
447 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
448 * from the kernel lists and can be freed or reused once this function
451 * This call sleeps to guarantee that no CPU is looking at the packet
454 void dev_remove_pack(struct packet_type *pt)
456 __dev_remove_pack(pt);
460 EXPORT_SYMBOL(dev_remove_pack);
462 /******************************************************************************
464 Device Boot-time Settings Routines
466 *******************************************************************************/
468 /* Boot time configuration table */
469 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
472 * netdev_boot_setup_add - add new setup entry
473 * @name: name of the device
474 * @map: configured settings for the device
476 * Adds new setup entry to the dev_boot_setup list. The function
477 * returns 0 on error and 1 on success. This is a generic routine to
480 static int netdev_boot_setup_add(char *name, struct ifmap *map)
482 struct netdev_boot_setup *s;
486 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
487 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
488 memset(s[i].name, 0, sizeof(s[i].name));
489 strlcpy(s[i].name, name, IFNAMSIZ);
490 memcpy(&s[i].map, map, sizeof(s[i].map));
495 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
499 * netdev_boot_setup_check - check boot time settings
500 * @dev: the netdevice
502 * Check boot time settings for the device.
503 * The found settings are set for the device to be used
504 * later in the device probing.
505 * Returns 0 if no settings found, 1 if they are.
507 int netdev_boot_setup_check(struct net_device *dev)
509 struct netdev_boot_setup *s = dev_boot_setup;
512 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
513 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
514 !strcmp(dev->name, s[i].name)) {
515 dev->irq = s[i].map.irq;
516 dev->base_addr = s[i].map.base_addr;
517 dev->mem_start = s[i].map.mem_start;
518 dev->mem_end = s[i].map.mem_end;
524 EXPORT_SYMBOL(netdev_boot_setup_check);
528 * netdev_boot_base - get address from boot time settings
529 * @prefix: prefix for network device
530 * @unit: id for network device
532 * Check boot time settings for the base address of device.
533 * The found settings are set for the device to be used
534 * later in the device probing.
535 * Returns 0 if no settings found.
537 unsigned long netdev_boot_base(const char *prefix, int unit)
539 const struct netdev_boot_setup *s = dev_boot_setup;
543 sprintf(name, "%s%d", prefix, unit);
546 * If device already registered then return base of 1
547 * to indicate not to probe for this interface
549 if (__dev_get_by_name(&init_net, name))
552 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
553 if (!strcmp(name, s[i].name))
554 return s[i].map.base_addr;
559 * Saves at boot time configured settings for any netdevice.
561 int __init netdev_boot_setup(char *str)
566 str = get_options(str, ARRAY_SIZE(ints), ints);
571 memset(&map, 0, sizeof(map));
575 map.base_addr = ints[2];
577 map.mem_start = ints[3];
579 map.mem_end = ints[4];
581 /* Add new entry to the list */
582 return netdev_boot_setup_add(str, &map);
585 __setup("netdev=", netdev_boot_setup);
587 /*******************************************************************************
589 Device Interface Subroutines
591 *******************************************************************************/
594 * __dev_get_by_name - find a device by its name
595 * @net: the applicable net namespace
596 * @name: name to find
598 * Find an interface by name. Must be called under RTNL semaphore
599 * or @dev_base_lock. If the name is found a pointer to the device
600 * is returned. If the name is not found then %NULL is returned. The
601 * reference counters are not incremented so the caller must be
602 * careful with locks.
605 struct net_device *__dev_get_by_name(struct net *net, const char *name)
607 struct hlist_node *p;
608 struct net_device *dev;
609 struct hlist_head *head = dev_name_hash(net, name);
611 hlist_for_each_entry(dev, p, head, name_hlist)
612 if (!strncmp(dev->name, name, IFNAMSIZ))
617 EXPORT_SYMBOL(__dev_get_by_name);
620 * dev_get_by_name_rcu - find a device by its name
621 * @net: the applicable net namespace
622 * @name: name to find
624 * Find an interface by name.
625 * If the name is found a pointer to the device is returned.
626 * If the name is not found then %NULL is returned.
627 * The reference counters are not incremented so the caller must be
628 * careful with locks. The caller must hold RCU lock.
631 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
633 struct hlist_node *p;
634 struct net_device *dev;
635 struct hlist_head *head = dev_name_hash(net, name);
637 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
638 if (!strncmp(dev->name, name, IFNAMSIZ))
643 EXPORT_SYMBOL(dev_get_by_name_rcu);
646 * dev_get_by_name - find a device by its name
647 * @net: the applicable net namespace
648 * @name: name to find
650 * Find an interface by name. This can be called from any
651 * context and does its own locking. The returned handle has
652 * the usage count incremented and the caller must use dev_put() to
653 * release it when it is no longer needed. %NULL is returned if no
654 * matching device is found.
657 struct net_device *dev_get_by_name(struct net *net, const char *name)
659 struct net_device *dev;
662 dev = dev_get_by_name_rcu(net, name);
668 EXPORT_SYMBOL(dev_get_by_name);
671 * __dev_get_by_index - find a device by its ifindex
672 * @net: the applicable net namespace
673 * @ifindex: index of device
675 * Search for an interface by index. Returns %NULL if the device
676 * is not found or a pointer to the device. The device has not
677 * had its reference counter increased so the caller must be careful
678 * about locking. The caller must hold either the RTNL semaphore
682 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
684 struct hlist_node *p;
685 struct net_device *dev;
686 struct hlist_head *head = dev_index_hash(net, ifindex);
688 hlist_for_each_entry(dev, p, head, index_hlist)
689 if (dev->ifindex == ifindex)
694 EXPORT_SYMBOL(__dev_get_by_index);
697 * dev_get_by_index_rcu - find a device by its ifindex
698 * @net: the applicable net namespace
699 * @ifindex: index of device
701 * Search for an interface by index. Returns %NULL if the device
702 * is not found or a pointer to the device. The device has not
703 * had its reference counter increased so the caller must be careful
704 * about locking. The caller must hold RCU lock.
707 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
709 struct hlist_node *p;
710 struct net_device *dev;
711 struct hlist_head *head = dev_index_hash(net, ifindex);
713 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
714 if (dev->ifindex == ifindex)
719 EXPORT_SYMBOL(dev_get_by_index_rcu);
723 * dev_get_by_index - find a device by its ifindex
724 * @net: the applicable net namespace
725 * @ifindex: index of device
727 * Search for an interface by index. Returns NULL if the device
728 * is not found or a pointer to the device. The device returned has
729 * had a reference added and the pointer is safe until the user calls
730 * dev_put to indicate they have finished with it.
733 struct net_device *dev_get_by_index(struct net *net, int ifindex)
735 struct net_device *dev;
738 dev = dev_get_by_index_rcu(net, ifindex);
744 EXPORT_SYMBOL(dev_get_by_index);
747 * dev_getbyhwaddr - find a device by its hardware address
748 * @net: the applicable net namespace
749 * @type: media type of device
750 * @ha: hardware address
752 * Search for an interface by MAC address. Returns NULL if the device
753 * is not found or a pointer to the device. The caller must hold the
754 * rtnl semaphore. The returned device has not had its ref count increased
755 * and the caller must therefore be careful about locking
758 * If the API was consistent this would be __dev_get_by_hwaddr
761 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
763 struct net_device *dev;
767 for_each_netdev(net, dev)
768 if (dev->type == type &&
769 !memcmp(dev->dev_addr, ha, dev->addr_len))
774 EXPORT_SYMBOL(dev_getbyhwaddr);
776 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
778 struct net_device *dev;
781 for_each_netdev(net, dev)
782 if (dev->type == type)
787 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
789 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
791 struct net_device *dev, *ret = NULL;
794 for_each_netdev_rcu(net, dev)
795 if (dev->type == type) {
803 EXPORT_SYMBOL(dev_getfirstbyhwtype);
806 * dev_get_by_flags - find any device with given flags
807 * @net: the applicable net namespace
808 * @if_flags: IFF_* values
809 * @mask: bitmask of bits in if_flags to check
811 * Search for any interface with the given flags. Returns NULL if a device
812 * is not found or a pointer to the device. The device returned has
813 * had a reference added and the pointer is safe until the user calls
814 * dev_put to indicate they have finished with it.
817 struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
820 struct net_device *dev, *ret;
824 for_each_netdev_rcu(net, dev) {
825 if (((dev->flags ^ if_flags) & mask) == 0) {
834 EXPORT_SYMBOL(dev_get_by_flags);
837 * dev_valid_name - check if name is okay for network device
840 * Network device names need to be valid file names to
841 * to allow sysfs to work. We also disallow any kind of
844 int dev_valid_name(const char *name)
848 if (strlen(name) >= IFNAMSIZ)
850 if (!strcmp(name, ".") || !strcmp(name, ".."))
854 if (*name == '/' || isspace(*name))
860 EXPORT_SYMBOL(dev_valid_name);
863 * __dev_alloc_name - allocate a name for a device
864 * @net: network namespace to allocate the device name in
865 * @name: name format string
866 * @buf: scratch buffer and result name string
868 * Passed a format string - eg "lt%d" it will try and find a suitable
869 * id. It scans list of devices to build up a free map, then chooses
870 * the first empty slot. The caller must hold the dev_base or rtnl lock
871 * while allocating the name and adding the device in order to avoid
873 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
874 * Returns the number of the unit assigned or a negative errno code.
877 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
881 const int max_netdevices = 8*PAGE_SIZE;
882 unsigned long *inuse;
883 struct net_device *d;
885 p = strnchr(name, IFNAMSIZ-1, '%');
888 * Verify the string as this thing may have come from
889 * the user. There must be either one "%d" and no other "%"
892 if (p[1] != 'd' || strchr(p + 2, '%'))
895 /* Use one page as a bit array of possible slots */
896 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
900 for_each_netdev(net, d) {
901 if (!sscanf(d->name, name, &i))
903 if (i < 0 || i >= max_netdevices)
906 /* avoid cases where sscanf is not exact inverse of printf */
907 snprintf(buf, IFNAMSIZ, name, i);
908 if (!strncmp(buf, d->name, IFNAMSIZ))
912 i = find_first_zero_bit(inuse, max_netdevices);
913 free_page((unsigned long) inuse);
917 snprintf(buf, IFNAMSIZ, name, i);
918 if (!__dev_get_by_name(net, buf))
921 /* It is possible to run out of possible slots
922 * when the name is long and there isn't enough space left
923 * for the digits, or if all bits are used.
929 * dev_alloc_name - allocate a name for a device
931 * @name: name format string
933 * Passed a format string - eg "lt%d" it will try and find a suitable
934 * id. It scans list of devices to build up a free map, then chooses
935 * the first empty slot. The caller must hold the dev_base or rtnl lock
936 * while allocating the name and adding the device in order to avoid
938 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
939 * Returns the number of the unit assigned or a negative errno code.
942 int dev_alloc_name(struct net_device *dev, const char *name)
948 BUG_ON(!dev_net(dev));
950 ret = __dev_alloc_name(net, name, buf);
952 strlcpy(dev->name, buf, IFNAMSIZ);
955 EXPORT_SYMBOL(dev_alloc_name);
957 static int dev_get_valid_name(struct net *net, const char *name, char *buf,
960 if (!dev_valid_name(name))
963 if (fmt && strchr(name, '%'))
964 return __dev_alloc_name(net, name, buf);
965 else if (__dev_get_by_name(net, name))
967 else if (buf != name)
968 strlcpy(buf, name, IFNAMSIZ);
974 * dev_change_name - change name of a device
976 * @newname: name (or format string) must be at least IFNAMSIZ
978 * Change name of a device, can pass format strings "eth%d".
981 int dev_change_name(struct net_device *dev, const char *newname)
983 char oldname[IFNAMSIZ];
989 BUG_ON(!dev_net(dev));
992 if (dev->flags & IFF_UP)
995 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
998 memcpy(oldname, dev->name, IFNAMSIZ);
1000 err = dev_get_valid_name(net, newname, dev->name, 1);
1005 /* For now only devices in the initial network namespace
1008 if (net_eq(net, &init_net)) {
1009 ret = device_rename(&dev->dev, dev->name);
1011 memcpy(dev->name, oldname, IFNAMSIZ);
1016 write_lock_bh(&dev_base_lock);
1017 hlist_del(&dev->name_hlist);
1018 write_unlock_bh(&dev_base_lock);
1022 write_lock_bh(&dev_base_lock);
1023 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1024 write_unlock_bh(&dev_base_lock);
1026 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1027 ret = notifier_to_errno(ret);
1030 /* err >= 0 after dev_alloc_name() or stores the first errno */
1033 memcpy(dev->name, oldname, IFNAMSIZ);
1037 "%s: name change rollback failed: %d.\n",
1046 * dev_set_alias - change ifalias of a device
1048 * @alias: name up to IFALIASZ
1049 * @len: limit of bytes to copy from info
1051 * Set ifalias for a device,
1053 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1057 if (len >= IFALIASZ)
1062 kfree(dev->ifalias);
1063 dev->ifalias = NULL;
1068 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1072 strlcpy(dev->ifalias, alias, len+1);
1078 * netdev_features_change - device changes features
1079 * @dev: device to cause notification
1081 * Called to indicate a device has changed features.
1083 void netdev_features_change(struct net_device *dev)
1085 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1087 EXPORT_SYMBOL(netdev_features_change);
1090 * netdev_state_change - device changes state
1091 * @dev: device to cause notification
1093 * Called to indicate a device has changed state. This function calls
1094 * the notifier chains for netdev_chain and sends a NEWLINK message
1095 * to the routing socket.
1097 void netdev_state_change(struct net_device *dev)
1099 if (dev->flags & IFF_UP) {
1100 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1101 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1104 EXPORT_SYMBOL(netdev_state_change);
1106 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1108 return call_netdevice_notifiers(event, dev);
1110 EXPORT_SYMBOL(netdev_bonding_change);
1113 * dev_load - load a network module
1114 * @net: the applicable net namespace
1115 * @name: name of interface
1117 * If a network interface is not present and the process has suitable
1118 * privileges this function loads the module. If module loading is not
1119 * available in this kernel then it becomes a nop.
1122 void dev_load(struct net *net, const char *name)
1124 struct net_device *dev;
1127 dev = dev_get_by_name_rcu(net, name);
1130 if (!dev && capable(CAP_NET_ADMIN))
1131 request_module("%s", name);
1133 EXPORT_SYMBOL(dev_load);
1135 static int __dev_open(struct net_device *dev)
1137 const struct net_device_ops *ops = dev->netdev_ops;
1143 * Is it even present?
1145 if (!netif_device_present(dev))
1148 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1149 ret = notifier_to_errno(ret);
1154 * Call device private open method
1156 set_bit(__LINK_STATE_START, &dev->state);
1158 if (ops->ndo_validate_addr)
1159 ret = ops->ndo_validate_addr(dev);
1161 if (!ret && ops->ndo_open)
1162 ret = ops->ndo_open(dev);
1165 * If it went open OK then:
1169 clear_bit(__LINK_STATE_START, &dev->state);
1174 dev->flags |= IFF_UP;
1179 net_dmaengine_get();
1182 * Initialize multicasting status
1184 dev_set_rx_mode(dev);
1187 * Wakeup transmit queue engine
1196 * dev_open - prepare an interface for use.
1197 * @dev: device to open
1199 * Takes a device from down to up state. The device's private open
1200 * function is invoked and then the multicast lists are loaded. Finally
1201 * the device is moved into the up state and a %NETDEV_UP message is
1202 * sent to the netdev notifier chain.
1204 * Calling this function on an active interface is a nop. On a failure
1205 * a negative errno code is returned.
1207 int dev_open(struct net_device *dev)
1214 if (dev->flags & IFF_UP)
1220 ret = __dev_open(dev);
1225 * ... and announce new interface.
1227 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1228 call_netdevice_notifiers(NETDEV_UP, dev);
1232 EXPORT_SYMBOL(dev_open);
1234 static int __dev_close(struct net_device *dev)
1236 const struct net_device_ops *ops = dev->netdev_ops;
1242 * Tell people we are going down, so that they can
1243 * prepare to death, when device is still operating.
1245 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1247 clear_bit(__LINK_STATE_START, &dev->state);
1249 /* Synchronize to scheduled poll. We cannot touch poll list,
1250 * it can be even on different cpu. So just clear netif_running().
1252 * dev->stop() will invoke napi_disable() on all of it's
1253 * napi_struct instances on this device.
1255 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1257 dev_deactivate(dev);
1260 * Call the device specific close. This cannot fail.
1261 * Only if device is UP
1263 * We allow it to be called even after a DETACH hot-plug
1270 * Device is now down.
1273 dev->flags &= ~IFF_UP;
1278 net_dmaengine_put();
1284 * dev_close - shutdown an interface.
1285 * @dev: device to shutdown
1287 * This function moves an active device into down state. A
1288 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1289 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1292 int dev_close(struct net_device *dev)
1294 if (!(dev->flags & IFF_UP))
1300 * Tell people we are down
1302 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1303 call_netdevice_notifiers(NETDEV_DOWN, dev);
1307 EXPORT_SYMBOL(dev_close);
1311 * dev_disable_lro - disable Large Receive Offload on a device
1314 * Disable Large Receive Offload (LRO) on a net device. Must be
1315 * called under RTNL. This is needed if received packets may be
1316 * forwarded to another interface.
1318 void dev_disable_lro(struct net_device *dev)
1320 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1321 dev->ethtool_ops->set_flags) {
1322 u32 flags = dev->ethtool_ops->get_flags(dev);
1323 if (flags & ETH_FLAG_LRO) {
1324 flags &= ~ETH_FLAG_LRO;
1325 dev->ethtool_ops->set_flags(dev, flags);
1328 WARN_ON(dev->features & NETIF_F_LRO);
1330 EXPORT_SYMBOL(dev_disable_lro);
1333 static int dev_boot_phase = 1;
1336 * Device change register/unregister. These are not inline or static
1337 * as we export them to the world.
1341 * register_netdevice_notifier - register a network notifier block
1344 * Register a notifier to be called when network device events occur.
1345 * The notifier passed is linked into the kernel structures and must
1346 * not be reused until it has been unregistered. A negative errno code
1347 * is returned on a failure.
1349 * When registered all registration and up events are replayed
1350 * to the new notifier to allow device to have a race free
1351 * view of the network device list.
1354 int register_netdevice_notifier(struct notifier_block *nb)
1356 struct net_device *dev;
1357 struct net_device *last;
1362 err = raw_notifier_chain_register(&netdev_chain, nb);
1368 for_each_netdev(net, dev) {
1369 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1370 err = notifier_to_errno(err);
1374 if (!(dev->flags & IFF_UP))
1377 nb->notifier_call(nb, NETDEV_UP, dev);
1388 for_each_netdev(net, dev) {
1392 if (dev->flags & IFF_UP) {
1393 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1394 nb->notifier_call(nb, NETDEV_DOWN, dev);
1396 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1397 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1401 raw_notifier_chain_unregister(&netdev_chain, nb);
1404 EXPORT_SYMBOL(register_netdevice_notifier);
1407 * unregister_netdevice_notifier - unregister a network notifier block
1410 * Unregister a notifier previously registered by
1411 * register_netdevice_notifier(). The notifier is unlinked into the
1412 * kernel structures and may then be reused. A negative errno code
1413 * is returned on a failure.
1416 int unregister_netdevice_notifier(struct notifier_block *nb)
1421 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1425 EXPORT_SYMBOL(unregister_netdevice_notifier);
1428 * call_netdevice_notifiers - call all network notifier blocks
1429 * @val: value passed unmodified to notifier function
1430 * @dev: net_device pointer passed unmodified to notifier function
1432 * Call all network notifier blocks. Parameters and return value
1433 * are as for raw_notifier_call_chain().
1436 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
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(struct sk_buff *skb)
1458 if (atomic_read(&netstamp_needed))
1459 __net_timestamp(skb);
1461 skb->tstamp.tv64 = 0;
1465 * dev_forward_skb - loopback an skb to another netif
1467 * @dev: destination network device
1468 * @skb: buffer to forward
1471 * NET_RX_SUCCESS (no congestion)
1472 * NET_RX_DROP (packet was dropped)
1474 * dev_forward_skb can be used for injecting an skb from the
1475 * start_xmit function of one device into the receive queue
1476 * of another device.
1478 * The receiving device may be in another namespace, so
1479 * we have to clear all information in the skb that could
1480 * impact namespace isolation.
1482 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1486 if (!(dev->flags & IFF_UP))
1489 if (skb->len > (dev->mtu + dev->hard_header_len))
1492 skb_set_dev(skb, dev);
1493 skb->tstamp.tv64 = 0;
1494 skb->pkt_type = PACKET_HOST;
1495 skb->protocol = eth_type_trans(skb, dev);
1496 return netif_rx(skb);
1498 EXPORT_SYMBOL_GPL(dev_forward_skb);
1501 * Support routine. Sends outgoing frames to any network
1502 * taps currently in use.
1505 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1507 struct packet_type *ptype;
1509 #ifdef CONFIG_NET_CLS_ACT
1510 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1517 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1518 /* Never send packets back to the socket
1519 * they originated from - MvS (miquels@drinkel.ow.org)
1521 if ((ptype->dev == dev || !ptype->dev) &&
1522 (ptype->af_packet_priv == NULL ||
1523 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1524 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1528 /* skb->nh should be correctly
1529 set by sender, so that the second statement is
1530 just protection against buggy protocols.
1532 skb_reset_mac_header(skb2);
1534 if (skb_network_header(skb2) < skb2->data ||
1535 skb2->network_header > skb2->tail) {
1536 if (net_ratelimit())
1537 printk(KERN_CRIT "protocol %04x is "
1539 skb2->protocol, dev->name);
1540 skb_reset_network_header(skb2);
1543 skb2->transport_header = skb2->network_header;
1544 skb2->pkt_type = PACKET_OUTGOING;
1545 ptype->func(skb2, skb->dev, ptype, skb->dev);
1552 static inline void __netif_reschedule(struct Qdisc *q)
1554 struct softnet_data *sd;
1555 unsigned long flags;
1557 local_irq_save(flags);
1558 sd = &__get_cpu_var(softnet_data);
1559 q->next_sched = sd->output_queue;
1560 sd->output_queue = q;
1561 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1562 local_irq_restore(flags);
1565 void __netif_schedule(struct Qdisc *q)
1567 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1568 __netif_reschedule(q);
1570 EXPORT_SYMBOL(__netif_schedule);
1572 void dev_kfree_skb_irq(struct sk_buff *skb)
1574 if (atomic_dec_and_test(&skb->users)) {
1575 struct softnet_data *sd;
1576 unsigned long flags;
1578 local_irq_save(flags);
1579 sd = &__get_cpu_var(softnet_data);
1580 skb->next = sd->completion_queue;
1581 sd->completion_queue = skb;
1582 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1583 local_irq_restore(flags);
1586 EXPORT_SYMBOL(dev_kfree_skb_irq);
1588 void dev_kfree_skb_any(struct sk_buff *skb)
1590 if (in_irq() || irqs_disabled())
1591 dev_kfree_skb_irq(skb);
1595 EXPORT_SYMBOL(dev_kfree_skb_any);
1599 * netif_device_detach - mark device as removed
1600 * @dev: network device
1602 * Mark device as removed from system and therefore no longer available.
1604 void netif_device_detach(struct net_device *dev)
1606 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1607 netif_running(dev)) {
1608 netif_tx_stop_all_queues(dev);
1611 EXPORT_SYMBOL(netif_device_detach);
1614 * netif_device_attach - mark device as attached
1615 * @dev: network device
1617 * Mark device as attached from system and restart if needed.
1619 void netif_device_attach(struct net_device *dev)
1621 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1622 netif_running(dev)) {
1623 netif_tx_wake_all_queues(dev);
1624 __netdev_watchdog_up(dev);
1627 EXPORT_SYMBOL(netif_device_attach);
1629 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1631 return ((features & NETIF_F_GEN_CSUM) ||
1632 ((features & NETIF_F_IP_CSUM) &&
1633 protocol == htons(ETH_P_IP)) ||
1634 ((features & NETIF_F_IPV6_CSUM) &&
1635 protocol == htons(ETH_P_IPV6)) ||
1636 ((features & NETIF_F_FCOE_CRC) &&
1637 protocol == htons(ETH_P_FCOE)));
1640 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1642 if (can_checksum_protocol(dev->features, skb->protocol))
1645 if (skb->protocol == htons(ETH_P_8021Q)) {
1646 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1647 if (can_checksum_protocol(dev->features & dev->vlan_features,
1648 veh->h_vlan_encapsulated_proto))
1656 * skb_dev_set -- assign a new device to a buffer
1657 * @skb: buffer for the new device
1658 * @dev: network device
1660 * If an skb is owned by a device already, we have to reset
1661 * all data private to the namespace a device belongs to
1662 * before assigning it a new device.
1664 #ifdef CONFIG_NET_NS
1665 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1668 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1671 skb_init_secmark(skb);
1675 skb->ipvs_property = 0;
1676 #ifdef CONFIG_NET_SCHED
1682 EXPORT_SYMBOL(skb_set_dev);
1683 #endif /* CONFIG_NET_NS */
1686 * Invalidate hardware checksum when packet is to be mangled, and
1687 * complete checksum manually on outgoing path.
1689 int skb_checksum_help(struct sk_buff *skb)
1692 int ret = 0, offset;
1694 if (skb->ip_summed == CHECKSUM_COMPLETE)
1695 goto out_set_summed;
1697 if (unlikely(skb_shinfo(skb)->gso_size)) {
1698 /* Let GSO fix up the checksum. */
1699 goto out_set_summed;
1702 offset = skb->csum_start - skb_headroom(skb);
1703 BUG_ON(offset >= skb_headlen(skb));
1704 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1706 offset += skb->csum_offset;
1707 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1709 if (skb_cloned(skb) &&
1710 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1711 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1716 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1718 skb->ip_summed = CHECKSUM_NONE;
1722 EXPORT_SYMBOL(skb_checksum_help);
1725 * skb_gso_segment - Perform segmentation on skb.
1726 * @skb: buffer to segment
1727 * @features: features for the output path (see dev->features)
1729 * This function segments the given skb and returns a list of segments.
1731 * It may return NULL if the skb requires no segmentation. This is
1732 * only possible when GSO is used for verifying header integrity.
1734 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1736 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1737 struct packet_type *ptype;
1738 __be16 type = skb->protocol;
1741 skb_reset_mac_header(skb);
1742 skb->mac_len = skb->network_header - skb->mac_header;
1743 __skb_pull(skb, skb->mac_len);
1745 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1746 struct net_device *dev = skb->dev;
1747 struct ethtool_drvinfo info = {};
1749 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1750 dev->ethtool_ops->get_drvinfo(dev, &info);
1752 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1754 info.driver, dev ? dev->features : 0L,
1755 skb->sk ? skb->sk->sk_route_caps : 0L,
1756 skb->len, skb->data_len, skb->ip_summed);
1758 if (skb_header_cloned(skb) &&
1759 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1760 return ERR_PTR(err);
1764 list_for_each_entry_rcu(ptype,
1765 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1766 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1767 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1768 err = ptype->gso_send_check(skb);
1769 segs = ERR_PTR(err);
1770 if (err || skb_gso_ok(skb, features))
1772 __skb_push(skb, (skb->data -
1773 skb_network_header(skb)));
1775 segs = ptype->gso_segment(skb, features);
1781 __skb_push(skb, skb->data - skb_mac_header(skb));
1785 EXPORT_SYMBOL(skb_gso_segment);
1787 /* Take action when hardware reception checksum errors are detected. */
1789 void netdev_rx_csum_fault(struct net_device *dev)
1791 if (net_ratelimit()) {
1792 printk(KERN_ERR "%s: hw csum failure.\n",
1793 dev ? dev->name : "<unknown>");
1797 EXPORT_SYMBOL(netdev_rx_csum_fault);
1800 /* Actually, we should eliminate this check as soon as we know, that:
1801 * 1. IOMMU is present and allows to map all the memory.
1802 * 2. No high memory really exists on this machine.
1805 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1807 #ifdef CONFIG_HIGHMEM
1809 if (!(dev->features & NETIF_F_HIGHDMA)) {
1810 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1811 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1815 if (PCI_DMA_BUS_IS_PHYS) {
1816 struct device *pdev = dev->dev.parent;
1820 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1821 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1822 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1831 void (*destructor)(struct sk_buff *skb);
1834 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1836 static void dev_gso_skb_destructor(struct sk_buff *skb)
1838 struct dev_gso_cb *cb;
1841 struct sk_buff *nskb = skb->next;
1843 skb->next = nskb->next;
1846 } while (skb->next);
1848 cb = DEV_GSO_CB(skb);
1850 cb->destructor(skb);
1854 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1855 * @skb: buffer to segment
1857 * This function segments the given skb and stores the list of segments
1860 static int dev_gso_segment(struct sk_buff *skb)
1862 struct net_device *dev = skb->dev;
1863 struct sk_buff *segs;
1864 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1867 segs = skb_gso_segment(skb, features);
1869 /* Verifying header integrity only. */
1874 return PTR_ERR(segs);
1877 DEV_GSO_CB(skb)->destructor = skb->destructor;
1878 skb->destructor = dev_gso_skb_destructor;
1884 * Try to orphan skb early, right before transmission by the device.
1885 * We cannot orphan skb if tx timestamp is requested, since
1886 * drivers need to call skb_tstamp_tx() to send the timestamp.
1888 static inline void skb_orphan_try(struct sk_buff *skb)
1890 if (!skb_tx(skb)->flags)
1894 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1895 struct netdev_queue *txq)
1897 const struct net_device_ops *ops = dev->netdev_ops;
1898 int rc = NETDEV_TX_OK;
1900 if (likely(!skb->next)) {
1901 if (!list_empty(&ptype_all))
1902 dev_queue_xmit_nit(skb, dev);
1904 if (netif_needs_gso(dev, skb)) {
1905 if (unlikely(dev_gso_segment(skb)))
1912 * If device doesnt need skb->dst, release it right now while
1913 * its hot in this cpu cache
1915 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1918 skb_orphan_try(skb);
1919 rc = ops->ndo_start_xmit(skb, dev);
1920 if (rc == NETDEV_TX_OK)
1921 txq_trans_update(txq);
1927 struct sk_buff *nskb = skb->next;
1929 skb->next = nskb->next;
1933 * If device doesnt need nskb->dst, release it right now while
1934 * its hot in this cpu cache
1936 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1939 skb_orphan_try(nskb);
1940 rc = ops->ndo_start_xmit(nskb, dev);
1941 if (unlikely(rc != NETDEV_TX_OK)) {
1942 if (rc & ~NETDEV_TX_MASK)
1943 goto out_kfree_gso_skb;
1944 nskb->next = skb->next;
1948 txq_trans_update(txq);
1949 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1950 return NETDEV_TX_BUSY;
1951 } while (skb->next);
1954 if (likely(skb->next == NULL))
1955 skb->destructor = DEV_GSO_CB(skb)->destructor;
1961 static u32 hashrnd __read_mostly;
1963 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1967 if (skb_rx_queue_recorded(skb)) {
1968 hash = skb_get_rx_queue(skb);
1969 while (unlikely(hash >= dev->real_num_tx_queues))
1970 hash -= dev->real_num_tx_queues;
1974 if (skb->sk && skb->sk->sk_hash)
1975 hash = skb->sk->sk_hash;
1977 hash = (__force u16) skb->protocol;
1979 hash = jhash_1word(hash, hashrnd);
1981 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1983 EXPORT_SYMBOL(skb_tx_hash);
1985 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
1987 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
1988 if (net_ratelimit()) {
1989 pr_warning("%s selects TX queue %d, but "
1990 "real number of TX queues is %d\n",
1991 dev->name, queue_index, dev->real_num_tx_queues);
1998 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
1999 struct sk_buff *skb)
2002 struct sock *sk = skb->sk;
2004 if (sk_tx_queue_recorded(sk)) {
2005 queue_index = sk_tx_queue_get(sk);
2007 const struct net_device_ops *ops = dev->netdev_ops;
2009 if (ops->ndo_select_queue) {
2010 queue_index = ops->ndo_select_queue(dev, skb);
2011 queue_index = dev_cap_txqueue(dev, queue_index);
2014 if (dev->real_num_tx_queues > 1)
2015 queue_index = skb_tx_hash(dev, skb);
2017 if (sk && rcu_dereference_check(sk->sk_dst_cache, 1))
2018 sk_tx_queue_set(sk, queue_index);
2022 skb_set_queue_mapping(skb, queue_index);
2023 return netdev_get_tx_queue(dev, queue_index);
2026 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2027 struct net_device *dev,
2028 struct netdev_queue *txq)
2030 spinlock_t *root_lock = qdisc_lock(q);
2033 spin_lock(root_lock);
2034 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2037 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2038 !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
2040 * This is a work-conserving queue; there are no old skbs
2041 * waiting to be sent out; and the qdisc is not running -
2042 * xmit the skb directly.
2044 __qdisc_update_bstats(q, skb->len);
2045 if (sch_direct_xmit(skb, q, dev, txq, root_lock))
2048 clear_bit(__QDISC_STATE_RUNNING, &q->state);
2050 rc = NET_XMIT_SUCCESS;
2052 rc = qdisc_enqueue_root(skb, q);
2055 spin_unlock(root_lock);
2061 * Returns true if either:
2062 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2063 * 2. skb is fragmented and the device does not support SG, or if
2064 * at least one of fragments is in highmem and device does not
2065 * support DMA from it.
2067 static inline int skb_needs_linearize(struct sk_buff *skb,
2068 struct net_device *dev)
2070 return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
2071 (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
2072 illegal_highdma(dev, skb)));
2076 * dev_queue_xmit - transmit a buffer
2077 * @skb: buffer to transmit
2079 * Queue a buffer for transmission to a network device. The caller must
2080 * have set the device and priority and built the buffer before calling
2081 * this function. The function can be called from an interrupt.
2083 * A negative errno code is returned on a failure. A success does not
2084 * guarantee the frame will be transmitted as it may be dropped due
2085 * to congestion or traffic shaping.
2087 * -----------------------------------------------------------------------------------
2088 * I notice this method can also return errors from the queue disciplines,
2089 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2092 * Regardless of the return value, the skb is consumed, so it is currently
2093 * difficult to retry a send to this method. (You can bump the ref count
2094 * before sending to hold a reference for retry if you are careful.)
2096 * When calling this method, interrupts MUST be enabled. This is because
2097 * the BH enable code must have IRQs enabled so that it will not deadlock.
2100 int dev_queue_xmit(struct sk_buff *skb)
2102 struct net_device *dev = skb->dev;
2103 struct netdev_queue *txq;
2107 /* GSO will handle the following emulations directly. */
2108 if (netif_needs_gso(dev, skb))
2111 /* Convert a paged skb to linear, if required */
2112 if (skb_needs_linearize(skb, dev) && __skb_linearize(skb))
2115 /* If packet is not checksummed and device does not support
2116 * checksumming for this protocol, complete checksumming here.
2118 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2119 skb_set_transport_header(skb, skb->csum_start -
2121 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
2126 /* Disable soft irqs for various locks below. Also
2127 * stops preemption for RCU.
2131 txq = dev_pick_tx(dev, skb);
2132 q = rcu_dereference_bh(txq->qdisc);
2134 #ifdef CONFIG_NET_CLS_ACT
2135 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2138 rc = __dev_xmit_skb(skb, q, dev, txq);
2142 /* The device has no queue. Common case for software devices:
2143 loopback, all the sorts of tunnels...
2145 Really, it is unlikely that netif_tx_lock protection is necessary
2146 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2148 However, it is possible, that they rely on protection
2151 Check this and shot the lock. It is not prone from deadlocks.
2152 Either shot noqueue qdisc, it is even simpler 8)
2154 if (dev->flags & IFF_UP) {
2155 int cpu = smp_processor_id(); /* ok because BHs are off */
2157 if (txq->xmit_lock_owner != cpu) {
2159 HARD_TX_LOCK(dev, txq, cpu);
2161 if (!netif_tx_queue_stopped(txq)) {
2162 rc = dev_hard_start_xmit(skb, dev, txq);
2163 if (dev_xmit_complete(rc)) {
2164 HARD_TX_UNLOCK(dev, txq);
2168 HARD_TX_UNLOCK(dev, txq);
2169 if (net_ratelimit())
2170 printk(KERN_CRIT "Virtual device %s asks to "
2171 "queue packet!\n", dev->name);
2173 /* Recursion is detected! It is possible,
2175 if (net_ratelimit())
2176 printk(KERN_CRIT "Dead loop on virtual device "
2177 "%s, fix it urgently!\n", dev->name);
2182 rcu_read_unlock_bh();
2188 rcu_read_unlock_bh();
2191 EXPORT_SYMBOL(dev_queue_xmit);
2194 /*=======================================================================
2196 =======================================================================*/
2198 int netdev_max_backlog __read_mostly = 1000;
2199 int netdev_budget __read_mostly = 300;
2200 int weight_p __read_mostly = 64; /* old backlog weight */
2202 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
2206 /* One global table that all flow-based protocols share. */
2207 struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
2208 EXPORT_SYMBOL(rps_sock_flow_table);
2211 * get_rps_cpu is called from netif_receive_skb and returns the target
2212 * CPU from the RPS map of the receiving queue for a given skb.
2213 * rcu_read_lock must be held on entry.
2215 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2216 struct rps_dev_flow **rflowp)
2218 struct ipv6hdr *ip6;
2220 struct netdev_rx_queue *rxqueue;
2221 struct rps_map *map;
2222 struct rps_dev_flow_table *flow_table;
2223 struct rps_sock_flow_table *sock_flow_table;
2227 u32 addr1, addr2, ports, ihl;
2229 if (skb_rx_queue_recorded(skb)) {
2230 u16 index = skb_get_rx_queue(skb);
2231 if (unlikely(index >= dev->num_rx_queues)) {
2232 if (net_ratelimit()) {
2233 pr_warning("%s received packet on queue "
2234 "%u, but number of RX queues is %u\n",
2235 dev->name, index, dev->num_rx_queues);
2239 rxqueue = dev->_rx + index;
2243 if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
2247 goto got_hash; /* Skip hash computation on packet header */
2249 switch (skb->protocol) {
2250 case __constant_htons(ETH_P_IP):
2251 if (!pskb_may_pull(skb, sizeof(*ip)))
2254 ip = (struct iphdr *) skb->data;
2255 ip_proto = ip->protocol;
2256 addr1 = (__force u32) ip->saddr;
2257 addr2 = (__force u32) ip->daddr;
2260 case __constant_htons(ETH_P_IPV6):
2261 if (!pskb_may_pull(skb, sizeof(*ip6)))
2264 ip6 = (struct ipv6hdr *) skb->data;
2265 ip_proto = ip6->nexthdr;
2266 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2267 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2281 case IPPROTO_UDPLITE:
2282 if (pskb_may_pull(skb, (ihl * 4) + 4)) {
2283 __be16 *hports = (__be16 *) (skb->data + (ihl * 4));
2286 sport = (__force u16) hports[0];
2287 dport = (__force u16) hports[1];
2290 ports = (sport << 16) + dport;
2298 /* get a consistent hash (same value on both flow directions) */
2301 skb->rxhash = jhash_3words(addr1, addr2, ports, hashrnd);
2306 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2307 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2308 if (flow_table && sock_flow_table) {
2310 struct rps_dev_flow *rflow;
2312 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2315 next_cpu = sock_flow_table->ents[skb->rxhash &
2316 sock_flow_table->mask];
2319 * If the desired CPU (where last recvmsg was done) is
2320 * different from current CPU (one in the rx-queue flow
2321 * table entry), switch if one of the following holds:
2322 * - Current CPU is unset (equal to RPS_NO_CPU).
2323 * - Current CPU is offline.
2324 * - The current CPU's queue tail has advanced beyond the
2325 * last packet that was enqueued using this table entry.
2326 * This guarantees that all previous packets for the flow
2327 * have been dequeued, thus preserving in order delivery.
2329 if (unlikely(tcpu != next_cpu) &&
2330 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2331 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2332 rflow->last_qtail)) >= 0)) {
2333 tcpu = rflow->cpu = next_cpu;
2334 if (tcpu != RPS_NO_CPU)
2335 rflow->last_qtail = per_cpu(softnet_data,
2336 tcpu).input_queue_head;
2338 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2345 map = rcu_dereference(rxqueue->rps_map);
2347 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2349 if (cpu_online(tcpu)) {
2359 /* Called from hardirq (IPI) context */
2360 static void rps_trigger_softirq(void *data)
2362 struct softnet_data *sd = data;
2364 __napi_schedule(&sd->backlog);
2365 __get_cpu_var(netdev_rx_stat).received_rps++;
2368 #endif /* CONFIG_RPS */
2371 * Check if this softnet_data structure is another cpu one
2372 * If yes, queue it to our IPI list and return 1
2375 static int rps_ipi_queued(struct softnet_data *sd)
2378 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2381 sd->rps_ipi_next = mysd->rps_ipi_list;
2382 mysd->rps_ipi_list = sd;
2384 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2387 #endif /* CONFIG_RPS */
2392 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2393 * queue (may be a remote CPU queue).
2395 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2396 unsigned int *qtail)
2398 struct softnet_data *sd;
2399 unsigned long flags;
2401 sd = &per_cpu(softnet_data, cpu);
2403 local_irq_save(flags);
2404 __get_cpu_var(netdev_rx_stat).total++;
2407 if (sd->input_pkt_queue.qlen <= netdev_max_backlog) {
2408 if (sd->input_pkt_queue.qlen) {
2410 __skb_queue_tail(&sd->input_pkt_queue, skb);
2412 *qtail = sd->input_queue_head + sd->input_pkt_queue.qlen;
2415 local_irq_restore(flags);
2416 return NET_RX_SUCCESS;
2419 /* Schedule NAPI for backlog device */
2420 if (napi_schedule_prep(&sd->backlog)) {
2421 if (!rps_ipi_queued(sd))
2422 __napi_schedule(&sd->backlog);
2429 __get_cpu_var(netdev_rx_stat).dropped++;
2430 local_irq_restore(flags);
2437 * netif_rx - post buffer to the network code
2438 * @skb: buffer to post
2440 * This function receives a packet from a device driver and queues it for
2441 * the upper (protocol) levels to process. It always succeeds. The buffer
2442 * may be dropped during processing for congestion control or by the
2446 * NET_RX_SUCCESS (no congestion)
2447 * NET_RX_DROP (packet was dropped)
2451 int netif_rx(struct sk_buff *skb)
2455 /* if netpoll wants it, pretend we never saw it */
2456 if (netpoll_rx(skb))
2459 if (!skb->tstamp.tv64)
2464 struct rps_dev_flow voidflow, *rflow = &voidflow;
2469 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2471 cpu = smp_processor_id();
2473 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2480 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2486 EXPORT_SYMBOL(netif_rx);
2488 int netif_rx_ni(struct sk_buff *skb)
2493 err = netif_rx(skb);
2494 if (local_softirq_pending())
2500 EXPORT_SYMBOL(netif_rx_ni);
2502 static void net_tx_action(struct softirq_action *h)
2504 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2506 if (sd->completion_queue) {
2507 struct sk_buff *clist;
2509 local_irq_disable();
2510 clist = sd->completion_queue;
2511 sd->completion_queue = NULL;
2515 struct sk_buff *skb = clist;
2516 clist = clist->next;
2518 WARN_ON(atomic_read(&skb->users));
2523 if (sd->output_queue) {
2526 local_irq_disable();
2527 head = sd->output_queue;
2528 sd->output_queue = NULL;
2532 struct Qdisc *q = head;
2533 spinlock_t *root_lock;
2535 head = head->next_sched;
2537 root_lock = qdisc_lock(q);
2538 if (spin_trylock(root_lock)) {
2539 smp_mb__before_clear_bit();
2540 clear_bit(__QDISC_STATE_SCHED,
2543 spin_unlock(root_lock);
2545 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2547 __netif_reschedule(q);
2549 smp_mb__before_clear_bit();
2550 clear_bit(__QDISC_STATE_SCHED,
2558 static inline int deliver_skb(struct sk_buff *skb,
2559 struct packet_type *pt_prev,
2560 struct net_device *orig_dev)
2562 atomic_inc(&skb->users);
2563 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2566 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2568 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
2569 /* This hook is defined here for ATM LANE */
2570 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2571 unsigned char *addr) __read_mostly;
2572 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2576 * If bridge module is loaded call bridging hook.
2577 * returns NULL if packet was consumed.
2579 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2580 struct sk_buff *skb) __read_mostly;
2581 EXPORT_SYMBOL_GPL(br_handle_frame_hook);
2583 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2584 struct packet_type **pt_prev, int *ret,
2585 struct net_device *orig_dev)
2587 struct net_bridge_port *port;
2589 if (skb->pkt_type == PACKET_LOOPBACK ||
2590 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2594 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2598 return br_handle_frame_hook(port, skb);
2601 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2604 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2605 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2606 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2608 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2609 struct packet_type **pt_prev,
2611 struct net_device *orig_dev)
2613 if (skb->dev->macvlan_port == NULL)
2617 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2620 return macvlan_handle_frame_hook(skb);
2623 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2626 #ifdef CONFIG_NET_CLS_ACT
2627 /* TODO: Maybe we should just force sch_ingress to be compiled in
2628 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2629 * a compare and 2 stores extra right now if we dont have it on
2630 * but have CONFIG_NET_CLS_ACT
2631 * NOTE: This doesnt stop any functionality; if you dont have
2632 * the ingress scheduler, you just cant add policies on ingress.
2635 static int ing_filter(struct sk_buff *skb)
2637 struct net_device *dev = skb->dev;
2638 u32 ttl = G_TC_RTTL(skb->tc_verd);
2639 struct netdev_queue *rxq;
2640 int result = TC_ACT_OK;
2643 if (MAX_RED_LOOP < ttl++) {
2645 "Redir loop detected Dropping packet (%d->%d)\n",
2646 skb->skb_iif, dev->ifindex);
2650 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2651 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2653 rxq = &dev->rx_queue;
2656 if (q != &noop_qdisc) {
2657 spin_lock(qdisc_lock(q));
2658 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2659 result = qdisc_enqueue_root(skb, q);
2660 spin_unlock(qdisc_lock(q));
2666 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2667 struct packet_type **pt_prev,
2668 int *ret, struct net_device *orig_dev)
2670 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2674 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2677 /* Huh? Why does turning on AF_PACKET affect this? */
2678 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2681 switch (ing_filter(skb)) {
2695 * netif_nit_deliver - deliver received packets to network taps
2698 * This function is used to deliver incoming packets to network
2699 * taps. It should be used when the normal netif_receive_skb path
2700 * is bypassed, for example because of VLAN acceleration.
2702 void netif_nit_deliver(struct sk_buff *skb)
2704 struct packet_type *ptype;
2706 if (list_empty(&ptype_all))
2709 skb_reset_network_header(skb);
2710 skb_reset_transport_header(skb);
2711 skb->mac_len = skb->network_header - skb->mac_header;
2714 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2715 if (!ptype->dev || ptype->dev == skb->dev)
2716 deliver_skb(skb, ptype, skb->dev);
2721 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2722 struct net_device *master)
2724 if (skb->pkt_type == PACKET_HOST) {
2725 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2727 memcpy(dest, master->dev_addr, ETH_ALEN);
2731 /* On bonding slaves other than the currently active slave, suppress
2732 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2733 * ARP on active-backup slaves with arp_validate enabled.
2735 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2737 struct net_device *dev = skb->dev;
2739 if (master->priv_flags & IFF_MASTER_ARPMON)
2740 dev->last_rx = jiffies;
2742 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
2743 /* Do address unmangle. The local destination address
2744 * will be always the one master has. Provides the right
2745 * functionality in a bridge.
2747 skb_bond_set_mac_by_master(skb, master);
2750 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2751 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2752 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2755 if (master->priv_flags & IFF_MASTER_ALB) {
2756 if (skb->pkt_type != PACKET_BROADCAST &&
2757 skb->pkt_type != PACKET_MULTICAST)
2760 if (master->priv_flags & IFF_MASTER_8023AD &&
2761 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2768 EXPORT_SYMBOL(__skb_bond_should_drop);
2770 static int __netif_receive_skb(struct sk_buff *skb)
2772 struct packet_type *ptype, *pt_prev;
2773 struct net_device *orig_dev;
2774 struct net_device *master;
2775 struct net_device *null_or_orig;
2776 struct net_device *null_or_bond;
2777 int ret = NET_RX_DROP;
2780 if (!skb->tstamp.tv64)
2783 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2784 return NET_RX_SUCCESS;
2786 /* if we've gotten here through NAPI, check netpoll */
2787 if (netpoll_receive_skb(skb))
2791 skb->skb_iif = skb->dev->ifindex;
2793 null_or_orig = NULL;
2794 orig_dev = skb->dev;
2795 master = ACCESS_ONCE(orig_dev->master);
2797 if (skb_bond_should_drop(skb, master))
2798 null_or_orig = orig_dev; /* deliver only exact match */
2803 __get_cpu_var(netdev_rx_stat).total++;
2805 skb_reset_network_header(skb);
2806 skb_reset_transport_header(skb);
2807 skb->mac_len = skb->network_header - skb->mac_header;
2813 #ifdef CONFIG_NET_CLS_ACT
2814 if (skb->tc_verd & TC_NCLS) {
2815 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2820 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2821 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2822 ptype->dev == orig_dev) {
2824 ret = deliver_skb(skb, pt_prev, orig_dev);
2829 #ifdef CONFIG_NET_CLS_ACT
2830 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2836 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2839 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2844 * Make sure frames received on VLAN interfaces stacked on
2845 * bonding interfaces still make their way to any base bonding
2846 * device that may have registered for a specific ptype. The
2847 * handler may have to adjust skb->dev and orig_dev.
2849 null_or_bond = NULL;
2850 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2851 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2852 null_or_bond = vlan_dev_real_dev(skb->dev);
2855 type = skb->protocol;
2856 list_for_each_entry_rcu(ptype,
2857 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2858 if (ptype->type == type && (ptype->dev == null_or_orig ||
2859 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2860 ptype->dev == null_or_bond)) {
2862 ret = deliver_skb(skb, pt_prev, orig_dev);
2868 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2871 /* Jamal, now you will not able to escape explaining
2872 * me how you were going to use this. :-)
2883 * netif_receive_skb - process receive buffer from network
2884 * @skb: buffer to process
2886 * netif_receive_skb() is the main receive data processing function.
2887 * It always succeeds. The buffer may be dropped during processing
2888 * for congestion control or by the protocol layers.
2890 * This function may only be called from softirq context and interrupts
2891 * should be enabled.
2893 * Return values (usually ignored):
2894 * NET_RX_SUCCESS: no congestion
2895 * NET_RX_DROP: packet was dropped
2897 int netif_receive_skb(struct sk_buff *skb)
2900 struct rps_dev_flow voidflow, *rflow = &voidflow;
2905 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2908 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2912 ret = __netif_receive_skb(skb);
2917 return __netif_receive_skb(skb);
2920 EXPORT_SYMBOL(netif_receive_skb);
2922 /* Network device is going away, flush any packets still pending
2923 * Called with irqs disabled.
2925 static void flush_backlog(void *arg)
2927 struct net_device *dev = arg;
2928 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2929 struct sk_buff *skb, *tmp;
2932 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp)
2933 if (skb->dev == dev) {
2934 __skb_unlink(skb, &sd->input_pkt_queue);
2936 input_queue_head_incr(sd);
2941 static int napi_gro_complete(struct sk_buff *skb)
2943 struct packet_type *ptype;
2944 __be16 type = skb->protocol;
2945 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2948 if (NAPI_GRO_CB(skb)->count == 1) {
2949 skb_shinfo(skb)->gso_size = 0;
2954 list_for_each_entry_rcu(ptype, head, list) {
2955 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2958 err = ptype->gro_complete(skb);
2964 WARN_ON(&ptype->list == head);
2966 return NET_RX_SUCCESS;
2970 return netif_receive_skb(skb);
2973 static void napi_gro_flush(struct napi_struct *napi)
2975 struct sk_buff *skb, *next;
2977 for (skb = napi->gro_list; skb; skb = next) {
2980 napi_gro_complete(skb);
2983 napi->gro_count = 0;
2984 napi->gro_list = NULL;
2987 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2989 struct sk_buff **pp = NULL;
2990 struct packet_type *ptype;
2991 __be16 type = skb->protocol;
2992 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2995 enum gro_result ret;
2997 if (!(skb->dev->features & NETIF_F_GRO))
3000 if (skb_is_gso(skb) || skb_has_frags(skb))
3004 list_for_each_entry_rcu(ptype, head, list) {
3005 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3008 skb_set_network_header(skb, skb_gro_offset(skb));
3009 mac_len = skb->network_header - skb->mac_header;
3010 skb->mac_len = mac_len;
3011 NAPI_GRO_CB(skb)->same_flow = 0;
3012 NAPI_GRO_CB(skb)->flush = 0;
3013 NAPI_GRO_CB(skb)->free = 0;
3015 pp = ptype->gro_receive(&napi->gro_list, skb);
3020 if (&ptype->list == head)
3023 same_flow = NAPI_GRO_CB(skb)->same_flow;
3024 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3027 struct sk_buff *nskb = *pp;
3031 napi_gro_complete(nskb);
3038 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3042 NAPI_GRO_CB(skb)->count = 1;
3043 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3044 skb->next = napi->gro_list;
3045 napi->gro_list = skb;
3049 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3050 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3052 BUG_ON(skb->end - skb->tail < grow);
3054 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3057 skb->data_len -= grow;
3059 skb_shinfo(skb)->frags[0].page_offset += grow;
3060 skb_shinfo(skb)->frags[0].size -= grow;
3062 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3063 put_page(skb_shinfo(skb)->frags[0].page);
3064 memmove(skb_shinfo(skb)->frags,
3065 skb_shinfo(skb)->frags + 1,
3066 --skb_shinfo(skb)->nr_frags);
3077 EXPORT_SYMBOL(dev_gro_receive);
3080 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3084 if (netpoll_rx_on(skb))
3087 for (p = napi->gro_list; p; p = p->next) {
3088 NAPI_GRO_CB(p)->same_flow =
3089 (p->dev == skb->dev) &&
3090 !compare_ether_header(skb_mac_header(p),
3091 skb_gro_mac_header(skb));
3092 NAPI_GRO_CB(p)->flush = 0;
3095 return dev_gro_receive(napi, skb);
3098 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3102 if (netif_receive_skb(skb))
3107 case GRO_MERGED_FREE:
3118 EXPORT_SYMBOL(napi_skb_finish);
3120 void skb_gro_reset_offset(struct sk_buff *skb)
3122 NAPI_GRO_CB(skb)->data_offset = 0;
3123 NAPI_GRO_CB(skb)->frag0 = NULL;
3124 NAPI_GRO_CB(skb)->frag0_len = 0;
3126 if (skb->mac_header == skb->tail &&
3127 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3128 NAPI_GRO_CB(skb)->frag0 =
3129 page_address(skb_shinfo(skb)->frags[0].page) +
3130 skb_shinfo(skb)->frags[0].page_offset;
3131 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3134 EXPORT_SYMBOL(skb_gro_reset_offset);
3136 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3138 skb_gro_reset_offset(skb);
3140 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3142 EXPORT_SYMBOL(napi_gro_receive);
3144 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3146 __skb_pull(skb, skb_headlen(skb));
3147 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3151 EXPORT_SYMBOL(napi_reuse_skb);
3153 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3155 struct sk_buff *skb = napi->skb;
3158 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3164 EXPORT_SYMBOL(napi_get_frags);
3166 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3172 skb->protocol = eth_type_trans(skb, skb->dev);
3174 if (ret == GRO_HELD)
3175 skb_gro_pull(skb, -ETH_HLEN);
3176 else if (netif_receive_skb(skb))
3181 case GRO_MERGED_FREE:
3182 napi_reuse_skb(napi, skb);
3191 EXPORT_SYMBOL(napi_frags_finish);
3193 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3195 struct sk_buff *skb = napi->skb;
3202 skb_reset_mac_header(skb);
3203 skb_gro_reset_offset(skb);
3205 off = skb_gro_offset(skb);
3206 hlen = off + sizeof(*eth);
3207 eth = skb_gro_header_fast(skb, off);
3208 if (skb_gro_header_hard(skb, hlen)) {
3209 eth = skb_gro_header_slow(skb, hlen, off);
3210 if (unlikely(!eth)) {
3211 napi_reuse_skb(napi, skb);
3217 skb_gro_pull(skb, sizeof(*eth));
3220 * This works because the only protocols we care about don't require
3221 * special handling. We'll fix it up properly at the end.
3223 skb->protocol = eth->h_proto;
3228 EXPORT_SYMBOL(napi_frags_skb);
3230 gro_result_t napi_gro_frags(struct napi_struct *napi)
3232 struct sk_buff *skb = napi_frags_skb(napi);
3237 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3239 EXPORT_SYMBOL(napi_gro_frags);
3241 static int process_backlog(struct napi_struct *napi, int quota)
3244 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3246 napi->weight = weight_p;
3248 struct sk_buff *skb;
3250 local_irq_disable();
3252 skb = __skb_dequeue(&sd->input_pkt_queue);
3254 __napi_complete(napi);
3259 input_queue_head_incr(sd);
3263 __netif_receive_skb(skb);
3264 } while (++work < quota);
3270 * __napi_schedule - schedule for receive
3271 * @n: entry to schedule
3273 * The entry's receive function will be scheduled to run
3275 void __napi_schedule(struct napi_struct *n)
3277 unsigned long flags;
3279 local_irq_save(flags);
3280 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
3281 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3282 local_irq_restore(flags);
3284 EXPORT_SYMBOL(__napi_schedule);
3286 void __napi_complete(struct napi_struct *n)
3288 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3289 BUG_ON(n->gro_list);
3291 list_del(&n->poll_list);
3292 smp_mb__before_clear_bit();
3293 clear_bit(NAPI_STATE_SCHED, &n->state);
3295 EXPORT_SYMBOL(__napi_complete);
3297 void napi_complete(struct napi_struct *n)
3299 unsigned long flags;
3302 * don't let napi dequeue from the cpu poll list
3303 * just in case its running on a different cpu
3305 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3309 local_irq_save(flags);
3311 local_irq_restore(flags);
3313 EXPORT_SYMBOL(napi_complete);
3315 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3316 int (*poll)(struct napi_struct *, int), int weight)
3318 INIT_LIST_HEAD(&napi->poll_list);
3319 napi->gro_count = 0;
3320 napi->gro_list = NULL;
3323 napi->weight = weight;
3324 list_add(&napi->dev_list, &dev->napi_list);
3326 #ifdef CONFIG_NETPOLL
3327 spin_lock_init(&napi->poll_lock);
3328 napi->poll_owner = -1;
3330 set_bit(NAPI_STATE_SCHED, &napi->state);
3332 EXPORT_SYMBOL(netif_napi_add);
3334 void netif_napi_del(struct napi_struct *napi)
3336 struct sk_buff *skb, *next;
3338 list_del_init(&napi->dev_list);
3339 napi_free_frags(napi);
3341 for (skb = napi->gro_list; skb; skb = next) {
3347 napi->gro_list = NULL;
3348 napi->gro_count = 0;
3350 EXPORT_SYMBOL(netif_napi_del);
3353 * net_rps_action sends any pending IPI's for rps.
3354 * Note: called with local irq disabled, but exits with local irq enabled.
3356 static void net_rps_action_and_irq_disable(void)
3359 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3360 struct softnet_data *remsd = sd->rps_ipi_list;
3363 sd->rps_ipi_list = NULL;
3367 /* Send pending IPI's to kick RPS processing on remote cpus. */
3369 struct softnet_data *next = remsd->rps_ipi_next;
3371 if (cpu_online(remsd->cpu))
3372 __smp_call_function_single(remsd->cpu,
3381 static void net_rx_action(struct softirq_action *h)
3383 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
3384 unsigned long time_limit = jiffies + 2;
3385 int budget = netdev_budget;
3388 local_irq_disable();
3390 while (!list_empty(list)) {
3391 struct napi_struct *n;
3394 /* If softirq window is exhuasted then punt.
3395 * Allow this to run for 2 jiffies since which will allow
3396 * an average latency of 1.5/HZ.
3398 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3403 /* Even though interrupts have been re-enabled, this
3404 * access is safe because interrupts can only add new
3405 * entries to the tail of this list, and only ->poll()
3406 * calls can remove this head entry from the list.
3408 n = list_first_entry(list, struct napi_struct, poll_list);
3410 have = netpoll_poll_lock(n);
3414 /* This NAPI_STATE_SCHED test is for avoiding a race
3415 * with netpoll's poll_napi(). Only the entity which
3416 * obtains the lock and sees NAPI_STATE_SCHED set will
3417 * actually make the ->poll() call. Therefore we avoid
3418 * accidently calling ->poll() when NAPI is not scheduled.
3421 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3422 work = n->poll(n, weight);
3426 WARN_ON_ONCE(work > weight);
3430 local_irq_disable();
3432 /* Drivers must not modify the NAPI state if they
3433 * consume the entire weight. In such cases this code
3434 * still "owns" the NAPI instance and therefore can
3435 * move the instance around on the list at-will.
3437 if (unlikely(work == weight)) {
3438 if (unlikely(napi_disable_pending(n))) {
3441 local_irq_disable();
3443 list_move_tail(&n->poll_list, list);
3446 netpoll_poll_unlock(have);
3449 net_rps_action_and_irq_disable();
3451 #ifdef CONFIG_NET_DMA
3453 * There may not be any more sk_buffs coming right now, so push
3454 * any pending DMA copies to hardware
3456 dma_issue_pending_all();
3462 __get_cpu_var(netdev_rx_stat).time_squeeze++;
3463 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3467 static gifconf_func_t *gifconf_list[NPROTO];
3470 * register_gifconf - register a SIOCGIF handler
3471 * @family: Address family
3472 * @gifconf: Function handler
3474 * Register protocol dependent address dumping routines. The handler
3475 * that is passed must not be freed or reused until it has been replaced
3476 * by another handler.
3478 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3480 if (family >= NPROTO)
3482 gifconf_list[family] = gifconf;
3485 EXPORT_SYMBOL(register_gifconf);
3489 * Map an interface index to its name (SIOCGIFNAME)
3493 * We need this ioctl for efficient implementation of the
3494 * if_indextoname() function required by the IPv6 API. Without
3495 * it, we would have to search all the interfaces to find a
3499 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3501 struct net_device *dev;
3505 * Fetch the caller's info block.
3508 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3512 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3518 strcpy(ifr.ifr_name, dev->name);
3521 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3527 * Perform a SIOCGIFCONF call. This structure will change
3528 * size eventually, and there is nothing I can do about it.
3529 * Thus we will need a 'compatibility mode'.
3532 static int dev_ifconf(struct net *net, char __user *arg)
3535 struct net_device *dev;
3542 * Fetch the caller's info block.
3545 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3552 * Loop over the interfaces, and write an info block for each.
3556 for_each_netdev(net, dev) {
3557 for (i = 0; i < NPROTO; i++) {
3558 if (gifconf_list[i]) {
3561 done = gifconf_list[i](dev, NULL, 0);
3563 done = gifconf_list[i](dev, pos + total,
3573 * All done. Write the updated control block back to the caller.
3575 ifc.ifc_len = total;
3578 * Both BSD and Solaris return 0 here, so we do too.
3580 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3583 #ifdef CONFIG_PROC_FS
3585 * This is invoked by the /proc filesystem handler to display a device
3588 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3591 struct net *net = seq_file_net(seq);
3593 struct net_device *dev;
3597 return SEQ_START_TOKEN;
3600 for_each_netdev_rcu(net, dev)
3607 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3609 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3610 first_net_device(seq_file_net(seq)) :
3611 next_net_device((struct net_device *)v);
3614 return rcu_dereference(dev);
3617 void dev_seq_stop(struct seq_file *seq, void *v)
3623 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3625 const struct net_device_stats *stats = dev_get_stats(dev);
3627 seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3628 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3629 dev->name, stats->rx_bytes, stats->rx_packets,
3631 stats->rx_dropped + stats->rx_missed_errors,
3632 stats->rx_fifo_errors,
3633 stats->rx_length_errors + stats->rx_over_errors +
3634 stats->rx_crc_errors + stats->rx_frame_errors,
3635 stats->rx_compressed, stats->multicast,
3636 stats->tx_bytes, stats->tx_packets,
3637 stats->tx_errors, stats->tx_dropped,
3638 stats->tx_fifo_errors, stats->collisions,
3639 stats->tx_carrier_errors +
3640 stats->tx_aborted_errors +
3641 stats->tx_window_errors +
3642 stats->tx_heartbeat_errors,
3643 stats->tx_compressed);
3647 * Called from the PROCfs module. This now uses the new arbitrary sized
3648 * /proc/net interface to create /proc/net/dev
3650 static int dev_seq_show(struct seq_file *seq, void *v)
3652 if (v == SEQ_START_TOKEN)
3653 seq_puts(seq, "Inter-| Receive "
3655 " face |bytes packets errs drop fifo frame "
3656 "compressed multicast|bytes packets errs "
3657 "drop fifo colls carrier compressed\n");
3659 dev_seq_printf_stats(seq, v);
3663 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
3665 struct netif_rx_stats *rc = NULL;
3667 while (*pos < nr_cpu_ids)
3668 if (cpu_online(*pos)) {
3669 rc = &per_cpu(netdev_rx_stat, *pos);
3676 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3678 return softnet_get_online(pos);
3681 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3684 return softnet_get_online(pos);
3687 static void softnet_seq_stop(struct seq_file *seq, void *v)
3691 static int softnet_seq_show(struct seq_file *seq, void *v)
3693 struct netif_rx_stats *s = v;
3695 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3696 s->total, s->dropped, s->time_squeeze, 0,
3697 0, 0, 0, 0, /* was fastroute */
3698 s->cpu_collision, s->received_rps);
3702 static const struct seq_operations dev_seq_ops = {
3703 .start = dev_seq_start,
3704 .next = dev_seq_next,
3705 .stop = dev_seq_stop,
3706 .show = dev_seq_show,
3709 static int dev_seq_open(struct inode *inode, struct file *file)
3711 return seq_open_net(inode, file, &dev_seq_ops,
3712 sizeof(struct seq_net_private));
3715 static const struct file_operations dev_seq_fops = {
3716 .owner = THIS_MODULE,
3717 .open = dev_seq_open,
3719 .llseek = seq_lseek,
3720 .release = seq_release_net,
3723 static const struct seq_operations softnet_seq_ops = {
3724 .start = softnet_seq_start,
3725 .next = softnet_seq_next,
3726 .stop = softnet_seq_stop,
3727 .show = softnet_seq_show,
3730 static int softnet_seq_open(struct inode *inode, struct file *file)
3732 return seq_open(file, &softnet_seq_ops);
3735 static const struct file_operations softnet_seq_fops = {
3736 .owner = THIS_MODULE,
3737 .open = softnet_seq_open,
3739 .llseek = seq_lseek,
3740 .release = seq_release,
3743 static void *ptype_get_idx(loff_t pos)
3745 struct packet_type *pt = NULL;
3749 list_for_each_entry_rcu(pt, &ptype_all, list) {
3755 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3756 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3765 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3769 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3772 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3774 struct packet_type *pt;
3775 struct list_head *nxt;
3779 if (v == SEQ_START_TOKEN)
3780 return ptype_get_idx(0);
3783 nxt = pt->list.next;
3784 if (pt->type == htons(ETH_P_ALL)) {
3785 if (nxt != &ptype_all)
3788 nxt = ptype_base[0].next;
3790 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3792 while (nxt == &ptype_base[hash]) {
3793 if (++hash >= PTYPE_HASH_SIZE)
3795 nxt = ptype_base[hash].next;
3798 return list_entry(nxt, struct packet_type, list);
3801 static void ptype_seq_stop(struct seq_file *seq, void *v)
3807 static int ptype_seq_show(struct seq_file *seq, void *v)
3809 struct packet_type *pt = v;
3811 if (v == SEQ_START_TOKEN)
3812 seq_puts(seq, "Type Device Function\n");
3813 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3814 if (pt->type == htons(ETH_P_ALL))
3815 seq_puts(seq, "ALL ");
3817 seq_printf(seq, "%04x", ntohs(pt->type));
3819 seq_printf(seq, " %-8s %pF\n",
3820 pt->dev ? pt->dev->name : "", pt->func);
3826 static const struct seq_operations ptype_seq_ops = {
3827 .start = ptype_seq_start,
3828 .next = ptype_seq_next,
3829 .stop = ptype_seq_stop,
3830 .show = ptype_seq_show,
3833 static int ptype_seq_open(struct inode *inode, struct file *file)
3835 return seq_open_net(inode, file, &ptype_seq_ops,
3836 sizeof(struct seq_net_private));
3839 static const struct file_operations ptype_seq_fops = {
3840 .owner = THIS_MODULE,
3841 .open = ptype_seq_open,
3843 .llseek = seq_lseek,
3844 .release = seq_release_net,
3848 static int __net_init dev_proc_net_init(struct net *net)
3852 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3854 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3856 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3859 if (wext_proc_init(net))
3865 proc_net_remove(net, "ptype");
3867 proc_net_remove(net, "softnet_stat");
3869 proc_net_remove(net, "dev");
3873 static void __net_exit dev_proc_net_exit(struct net *net)
3875 wext_proc_exit(net);
3877 proc_net_remove(net, "ptype");
3878 proc_net_remove(net, "softnet_stat");
3879 proc_net_remove(net, "dev");
3882 static struct pernet_operations __net_initdata dev_proc_ops = {
3883 .init = dev_proc_net_init,
3884 .exit = dev_proc_net_exit,
3887 static int __init dev_proc_init(void)
3889 return register_pernet_subsys(&dev_proc_ops);
3892 #define dev_proc_init() 0
3893 #endif /* CONFIG_PROC_FS */
3897 * netdev_set_master - set up master/slave pair
3898 * @slave: slave device
3899 * @master: new master device
3901 * Changes the master device of the slave. Pass %NULL to break the
3902 * bonding. The caller must hold the RTNL semaphore. On a failure
3903 * a negative errno code is returned. On success the reference counts
3904 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3905 * function returns zero.
3907 int netdev_set_master(struct net_device *slave, struct net_device *master)
3909 struct net_device *old = slave->master;
3919 slave->master = master;
3926 slave->flags |= IFF_SLAVE;
3928 slave->flags &= ~IFF_SLAVE;
3930 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3933 EXPORT_SYMBOL(netdev_set_master);
3935 static void dev_change_rx_flags(struct net_device *dev, int flags)
3937 const struct net_device_ops *ops = dev->netdev_ops;
3939 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3940 ops->ndo_change_rx_flags(dev, flags);
3943 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3945 unsigned short old_flags = dev->flags;
3951 dev->flags |= IFF_PROMISC;
3952 dev->promiscuity += inc;
3953 if (dev->promiscuity == 0) {
3956 * If inc causes overflow, untouch promisc and return error.
3959 dev->flags &= ~IFF_PROMISC;
3961 dev->promiscuity -= inc;
3962 printk(KERN_WARNING "%s: promiscuity touches roof, "
3963 "set promiscuity failed, promiscuity feature "
3964 "of device might be broken.\n", dev->name);
3968 if (dev->flags != old_flags) {
3969 printk(KERN_INFO "device %s %s promiscuous mode\n",
3970 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3972 if (audit_enabled) {
3973 current_uid_gid(&uid, &gid);
3974 audit_log(current->audit_context, GFP_ATOMIC,
3975 AUDIT_ANOM_PROMISCUOUS,
3976 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3977 dev->name, (dev->flags & IFF_PROMISC),
3978 (old_flags & IFF_PROMISC),
3979 audit_get_loginuid(current),
3981 audit_get_sessionid(current));
3984 dev_change_rx_flags(dev, IFF_PROMISC);
3990 * dev_set_promiscuity - update promiscuity count on a device
3994 * Add or remove promiscuity from a device. While the count in the device
3995 * remains above zero the interface remains promiscuous. Once it hits zero
3996 * the device reverts back to normal filtering operation. A negative inc
3997 * value is used to drop promiscuity on the device.
3998 * Return 0 if successful or a negative errno code on error.
4000 int dev_set_promiscuity(struct net_device *dev, int inc)
4002 unsigned short old_flags = dev->flags;
4005 err = __dev_set_promiscuity(dev, inc);
4008 if (dev->flags != old_flags)
4009 dev_set_rx_mode(dev);
4012 EXPORT_SYMBOL(dev_set_promiscuity);
4015 * dev_set_allmulti - update allmulti count on a device
4019 * Add or remove reception of all multicast frames to a device. While the
4020 * count in the device remains above zero the interface remains listening
4021 * to all interfaces. Once it hits zero the device reverts back to normal
4022 * filtering operation. A negative @inc value is used to drop the counter
4023 * when releasing a resource needing all multicasts.
4024 * Return 0 if successful or a negative errno code on error.
4027 int dev_set_allmulti(struct net_device *dev, int inc)
4029 unsigned short old_flags = dev->flags;
4033 dev->flags |= IFF_ALLMULTI;
4034 dev->allmulti += inc;
4035 if (dev->allmulti == 0) {
4038 * If inc causes overflow, untouch allmulti and return error.
4041 dev->flags &= ~IFF_ALLMULTI;
4043 dev->allmulti -= inc;
4044 printk(KERN_WARNING "%s: allmulti touches roof, "
4045 "set allmulti failed, allmulti feature of "
4046 "device might be broken.\n", dev->name);
4050 if (dev->flags ^ old_flags) {
4051 dev_change_rx_flags(dev, IFF_ALLMULTI);
4052 dev_set_rx_mode(dev);
4056 EXPORT_SYMBOL(dev_set_allmulti);
4059 * Upload unicast and multicast address lists to device and
4060 * configure RX filtering. When the device doesn't support unicast
4061 * filtering it is put in promiscuous mode while unicast addresses
4064 void __dev_set_rx_mode(struct net_device *dev)
4066 const struct net_device_ops *ops = dev->netdev_ops;
4068 /* dev_open will call this function so the list will stay sane. */
4069 if (!(dev->flags&IFF_UP))
4072 if (!netif_device_present(dev))
4075 if (ops->ndo_set_rx_mode)
4076 ops->ndo_set_rx_mode(dev);
4078 /* Unicast addresses changes may only happen under the rtnl,
4079 * therefore calling __dev_set_promiscuity here is safe.
4081 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4082 __dev_set_promiscuity(dev, 1);
4083 dev->uc_promisc = 1;
4084 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4085 __dev_set_promiscuity(dev, -1);
4086 dev->uc_promisc = 0;
4089 if (ops->ndo_set_multicast_list)
4090 ops->ndo_set_multicast_list(dev);
4094 void dev_set_rx_mode(struct net_device *dev)
4096 netif_addr_lock_bh(dev);
4097 __dev_set_rx_mode(dev);
4098 netif_addr_unlock_bh(dev);
4102 * dev_get_flags - get flags reported to userspace
4105 * Get the combination of flag bits exported through APIs to userspace.
4107 unsigned dev_get_flags(const struct net_device *dev)
4111 flags = (dev->flags & ~(IFF_PROMISC |
4116 (dev->gflags & (IFF_PROMISC |
4119 if (netif_running(dev)) {
4120 if (netif_oper_up(dev))
4121 flags |= IFF_RUNNING;
4122 if (netif_carrier_ok(dev))
4123 flags |= IFF_LOWER_UP;
4124 if (netif_dormant(dev))
4125 flags |= IFF_DORMANT;
4130 EXPORT_SYMBOL(dev_get_flags);
4132 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4134 int old_flags = dev->flags;
4140 * Set the flags on our device.
4143 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4144 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4146 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4150 * Load in the correct multicast list now the flags have changed.
4153 if ((old_flags ^ flags) & IFF_MULTICAST)
4154 dev_change_rx_flags(dev, IFF_MULTICAST);
4156 dev_set_rx_mode(dev);
4159 * Have we downed the interface. We handle IFF_UP ourselves
4160 * according to user attempts to set it, rather than blindly
4165 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4166 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4169 dev_set_rx_mode(dev);
4172 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4173 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4175 dev->gflags ^= IFF_PROMISC;
4176 dev_set_promiscuity(dev, inc);
4179 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4180 is important. Some (broken) drivers set IFF_PROMISC, when
4181 IFF_ALLMULTI is requested not asking us and not reporting.
4183 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4184 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4186 dev->gflags ^= IFF_ALLMULTI;
4187 dev_set_allmulti(dev, inc);
4193 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4195 unsigned int changes = dev->flags ^ old_flags;
4197 if (changes & IFF_UP) {
4198 if (dev->flags & IFF_UP)
4199 call_netdevice_notifiers(NETDEV_UP, dev);
4201 call_netdevice_notifiers(NETDEV_DOWN, dev);
4204 if (dev->flags & IFF_UP &&
4205 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4206 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4210 * dev_change_flags - change device settings
4212 * @flags: device state flags
4214 * Change settings on device based state flags. The flags are
4215 * in the userspace exported format.
4217 int dev_change_flags(struct net_device *dev, unsigned flags)
4220 int old_flags = dev->flags;
4222 ret = __dev_change_flags(dev, flags);
4226 changes = old_flags ^ dev->flags;
4228 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4230 __dev_notify_flags(dev, old_flags);
4233 EXPORT_SYMBOL(dev_change_flags);
4236 * dev_set_mtu - Change maximum transfer unit
4238 * @new_mtu: new transfer unit
4240 * Change the maximum transfer size of the network device.
4242 int dev_set_mtu(struct net_device *dev, int new_mtu)
4244 const struct net_device_ops *ops = dev->netdev_ops;
4247 if (new_mtu == dev->mtu)
4250 /* MTU must be positive. */
4254 if (!netif_device_present(dev))
4258 if (ops->ndo_change_mtu)
4259 err = ops->ndo_change_mtu(dev, new_mtu);
4263 if (!err && dev->flags & IFF_UP)
4264 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4267 EXPORT_SYMBOL(dev_set_mtu);
4270 * dev_set_mac_address - Change Media Access Control Address
4274 * Change the hardware (MAC) address of the device
4276 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4278 const struct net_device_ops *ops = dev->netdev_ops;
4281 if (!ops->ndo_set_mac_address)
4283 if (sa->sa_family != dev->type)
4285 if (!netif_device_present(dev))
4287 err = ops->ndo_set_mac_address(dev, sa);
4289 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4292 EXPORT_SYMBOL(dev_set_mac_address);
4295 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4297 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4300 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4306 case SIOCGIFFLAGS: /* Get interface flags */
4307 ifr->ifr_flags = (short) dev_get_flags(dev);
4310 case SIOCGIFMETRIC: /* Get the metric on the interface
4311 (currently unused) */
4312 ifr->ifr_metric = 0;
4315 case SIOCGIFMTU: /* Get the MTU of a device */
4316 ifr->ifr_mtu = dev->mtu;
4321 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4323 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4324 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4325 ifr->ifr_hwaddr.sa_family = dev->type;
4333 ifr->ifr_map.mem_start = dev->mem_start;
4334 ifr->ifr_map.mem_end = dev->mem_end;
4335 ifr->ifr_map.base_addr = dev->base_addr;
4336 ifr->ifr_map.irq = dev->irq;
4337 ifr->ifr_map.dma = dev->dma;
4338 ifr->ifr_map.port = dev->if_port;
4342 ifr->ifr_ifindex = dev->ifindex;
4346 ifr->ifr_qlen = dev->tx_queue_len;
4350 /* dev_ioctl() should ensure this case
4362 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4364 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4367 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4368 const struct net_device_ops *ops;
4373 ops = dev->netdev_ops;
4376 case SIOCSIFFLAGS: /* Set interface flags */
4377 return dev_change_flags(dev, ifr->ifr_flags);
4379 case SIOCSIFMETRIC: /* Set the metric on the interface
4380 (currently unused) */
4383 case SIOCSIFMTU: /* Set the MTU of a device */
4384 return dev_set_mtu(dev, ifr->ifr_mtu);
4387 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4389 case SIOCSIFHWBROADCAST:
4390 if (ifr->ifr_hwaddr.sa_family != dev->type)
4392 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4393 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4394 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4398 if (ops->ndo_set_config) {
4399 if (!netif_device_present(dev))
4401 return ops->ndo_set_config(dev, &ifr->ifr_map);
4406 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4407 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4409 if (!netif_device_present(dev))
4411 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4414 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4415 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4417 if (!netif_device_present(dev))
4419 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4422 if (ifr->ifr_qlen < 0)
4424 dev->tx_queue_len = ifr->ifr_qlen;
4428 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4429 return dev_change_name(dev, ifr->ifr_newname);
4432 * Unknown or private ioctl
4435 if ((cmd >= SIOCDEVPRIVATE &&
4436 cmd <= SIOCDEVPRIVATE + 15) ||
4437 cmd == SIOCBONDENSLAVE ||
4438 cmd == SIOCBONDRELEASE ||
4439 cmd == SIOCBONDSETHWADDR ||
4440 cmd == SIOCBONDSLAVEINFOQUERY ||
4441 cmd == SIOCBONDINFOQUERY ||
4442 cmd == SIOCBONDCHANGEACTIVE ||
4443 cmd == SIOCGMIIPHY ||
4444 cmd == SIOCGMIIREG ||
4445 cmd == SIOCSMIIREG ||
4446 cmd == SIOCBRADDIF ||
4447 cmd == SIOCBRDELIF ||
4448 cmd == SIOCSHWTSTAMP ||
4449 cmd == SIOCWANDEV) {
4451 if (ops->ndo_do_ioctl) {
4452 if (netif_device_present(dev))
4453 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4465 * This function handles all "interface"-type I/O control requests. The actual
4466 * 'doing' part of this is dev_ifsioc above.
4470 * dev_ioctl - network device ioctl
4471 * @net: the applicable net namespace
4472 * @cmd: command to issue
4473 * @arg: pointer to a struct ifreq in user space
4475 * Issue ioctl functions to devices. This is normally called by the
4476 * user space syscall interfaces but can sometimes be useful for
4477 * other purposes. The return value is the return from the syscall if
4478 * positive or a negative errno code on error.
4481 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4487 /* One special case: SIOCGIFCONF takes ifconf argument
4488 and requires shared lock, because it sleeps writing
4492 if (cmd == SIOCGIFCONF) {
4494 ret = dev_ifconf(net, (char __user *) arg);
4498 if (cmd == SIOCGIFNAME)
4499 return dev_ifname(net, (struct ifreq __user *)arg);
4501 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4504 ifr.ifr_name[IFNAMSIZ-1] = 0;
4506 colon = strchr(ifr.ifr_name, ':');
4511 * See which interface the caller is talking about.
4516 * These ioctl calls:
4517 * - can be done by all.
4518 * - atomic and do not require locking.
4529 dev_load(net, ifr.ifr_name);
4531 ret = dev_ifsioc_locked(net, &ifr, cmd);
4536 if (copy_to_user(arg, &ifr,
4537 sizeof(struct ifreq)))
4543 dev_load(net, ifr.ifr_name);
4545 ret = dev_ethtool(net, &ifr);
4550 if (copy_to_user(arg, &ifr,
4551 sizeof(struct ifreq)))
4557 * These ioctl calls:
4558 * - require superuser power.
4559 * - require strict serialization.
4565 if (!capable(CAP_NET_ADMIN))
4567 dev_load(net, ifr.ifr_name);
4569 ret = dev_ifsioc(net, &ifr, cmd);
4574 if (copy_to_user(arg, &ifr,
4575 sizeof(struct ifreq)))
4581 * These ioctl calls:
4582 * - require superuser power.
4583 * - require strict serialization.
4584 * - do not return a value
4594 case SIOCSIFHWBROADCAST:
4597 case SIOCBONDENSLAVE:
4598 case SIOCBONDRELEASE:
4599 case SIOCBONDSETHWADDR:
4600 case SIOCBONDCHANGEACTIVE:
4604 if (!capable(CAP_NET_ADMIN))
4607 case SIOCBONDSLAVEINFOQUERY:
4608 case SIOCBONDINFOQUERY:
4609 dev_load(net, ifr.ifr_name);
4611 ret = dev_ifsioc(net, &ifr, cmd);
4616 /* Get the per device memory space. We can add this but
4617 * currently do not support it */
4619 /* Set the per device memory buffer space.
4620 * Not applicable in our case */
4625 * Unknown or private ioctl.
4628 if (cmd == SIOCWANDEV ||
4629 (cmd >= SIOCDEVPRIVATE &&
4630 cmd <= SIOCDEVPRIVATE + 15)) {
4631 dev_load(net, ifr.ifr_name);
4633 ret = dev_ifsioc(net, &ifr, cmd);
4635 if (!ret && copy_to_user(arg, &ifr,
4636 sizeof(struct ifreq)))
4640 /* Take care of Wireless Extensions */
4641 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4642 return wext_handle_ioctl(net, &ifr, cmd, arg);
4649 * dev_new_index - allocate an ifindex
4650 * @net: the applicable net namespace
4652 * Returns a suitable unique value for a new device interface
4653 * number. The caller must hold the rtnl semaphore or the
4654 * dev_base_lock to be sure it remains unique.
4656 static int dev_new_index(struct net *net)
4662 if (!__dev_get_by_index(net, ifindex))
4667 /* Delayed registration/unregisteration */
4668 static LIST_HEAD(net_todo_list);
4670 static void net_set_todo(struct net_device *dev)
4672 list_add_tail(&dev->todo_list, &net_todo_list);
4675 static void rollback_registered_many(struct list_head *head)
4677 struct net_device *dev, *tmp;
4679 BUG_ON(dev_boot_phase);
4682 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4683 /* Some devices call without registering
4684 * for initialization unwind. Remove those
4685 * devices and proceed with the remaining.
4687 if (dev->reg_state == NETREG_UNINITIALIZED) {
4688 pr_debug("unregister_netdevice: device %s/%p never "
4689 "was registered\n", dev->name, dev);
4692 list_del(&dev->unreg_list);
4696 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4698 /* If device is running, close it first. */
4701 /* And unlink it from device chain. */
4702 unlist_netdevice(dev);
4704 dev->reg_state = NETREG_UNREGISTERING;
4709 list_for_each_entry(dev, head, unreg_list) {
4710 /* Shutdown queueing discipline. */
4714 /* Notify protocols, that we are about to destroy
4715 this device. They should clean all the things.
4717 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4719 if (!dev->rtnl_link_ops ||
4720 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4721 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4724 * Flush the unicast and multicast chains
4729 if (dev->netdev_ops->ndo_uninit)
4730 dev->netdev_ops->ndo_uninit(dev);
4732 /* Notifier chain MUST detach us from master device. */
4733 WARN_ON(dev->master);
4735 /* Remove entries from kobject tree */
4736 netdev_unregister_kobject(dev);
4739 /* Process any work delayed until the end of the batch */
4740 dev = list_first_entry(head, struct net_device, unreg_list);
4741 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4745 list_for_each_entry(dev, head, unreg_list)
4749 static void rollback_registered(struct net_device *dev)
4753 list_add(&dev->unreg_list, &single);
4754 rollback_registered_many(&single);
4757 static void __netdev_init_queue_locks_one(struct net_device *dev,
4758 struct netdev_queue *dev_queue,
4761 spin_lock_init(&dev_queue->_xmit_lock);
4762 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4763 dev_queue->xmit_lock_owner = -1;
4766 static void netdev_init_queue_locks(struct net_device *dev)
4768 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4769 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4772 unsigned long netdev_fix_features(unsigned long features, const char *name)
4774 /* Fix illegal SG+CSUM combinations. */
4775 if ((features & NETIF_F_SG) &&
4776 !(features & NETIF_F_ALL_CSUM)) {
4778 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4779 "checksum feature.\n", name);
4780 features &= ~NETIF_F_SG;
4783 /* TSO requires that SG is present as well. */
4784 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4786 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4787 "SG feature.\n", name);
4788 features &= ~NETIF_F_TSO;
4791 if (features & NETIF_F_UFO) {
4792 if (!(features & NETIF_F_GEN_CSUM)) {
4794 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4795 "since no NETIF_F_HW_CSUM feature.\n",
4797 features &= ~NETIF_F_UFO;
4800 if (!(features & NETIF_F_SG)) {
4802 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4803 "since no NETIF_F_SG feature.\n", name);
4804 features &= ~NETIF_F_UFO;
4810 EXPORT_SYMBOL(netdev_fix_features);
4813 * netif_stacked_transfer_operstate - transfer operstate
4814 * @rootdev: the root or lower level device to transfer state from
4815 * @dev: the device to transfer operstate to
4817 * Transfer operational state from root to device. This is normally
4818 * called when a stacking relationship exists between the root
4819 * device and the device(a leaf device).
4821 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4822 struct net_device *dev)
4824 if (rootdev->operstate == IF_OPER_DORMANT)
4825 netif_dormant_on(dev);
4827 netif_dormant_off(dev);
4829 if (netif_carrier_ok(rootdev)) {
4830 if (!netif_carrier_ok(dev))
4831 netif_carrier_on(dev);
4833 if (netif_carrier_ok(dev))
4834 netif_carrier_off(dev);
4837 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4840 * register_netdevice - register a network device
4841 * @dev: device to register
4843 * Take a completed network device structure and add it to the kernel
4844 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4845 * chain. 0 is returned on success. A negative errno code is returned
4846 * on a failure to set up the device, or if the name is a duplicate.
4848 * Callers must hold the rtnl semaphore. You may want
4849 * register_netdev() instead of this.
4852 * The locking appears insufficient to guarantee two parallel registers
4853 * will not get the same name.
4856 int register_netdevice(struct net_device *dev)
4859 struct net *net = dev_net(dev);
4861 BUG_ON(dev_boot_phase);
4866 /* When net_device's are persistent, this will be fatal. */
4867 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4870 spin_lock_init(&dev->addr_list_lock);
4871 netdev_set_addr_lockdep_class(dev);
4872 netdev_init_queue_locks(dev);
4877 if (!dev->num_rx_queues) {
4879 * Allocate a single RX queue if driver never called
4883 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
4889 dev->_rx->first = dev->_rx;
4890 atomic_set(&dev->_rx->count, 1);
4891 dev->num_rx_queues = 1;
4894 /* Init, if this function is available */
4895 if (dev->netdev_ops->ndo_init) {
4896 ret = dev->netdev_ops->ndo_init(dev);
4904 ret = dev_get_valid_name(net, dev->name, dev->name, 0);
4908 dev->ifindex = dev_new_index(net);
4909 if (dev->iflink == -1)
4910 dev->iflink = dev->ifindex;
4912 /* Fix illegal checksum combinations */
4913 if ((dev->features & NETIF_F_HW_CSUM) &&
4914 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4915 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4917 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4920 if ((dev->features & NETIF_F_NO_CSUM) &&
4921 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4922 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4924 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4927 dev->features = netdev_fix_features(dev->features, dev->name);
4929 /* Enable software GSO if SG is supported. */
4930 if (dev->features & NETIF_F_SG)
4931 dev->features |= NETIF_F_GSO;
4933 netdev_initialize_kobject(dev);
4935 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
4936 ret = notifier_to_errno(ret);
4940 ret = netdev_register_kobject(dev);
4943 dev->reg_state = NETREG_REGISTERED;
4946 * Default initial state at registry is that the
4947 * device is present.
4950 set_bit(__LINK_STATE_PRESENT, &dev->state);
4952 dev_init_scheduler(dev);
4954 list_netdevice(dev);
4956 /* Notify protocols, that a new device appeared. */
4957 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4958 ret = notifier_to_errno(ret);
4960 rollback_registered(dev);
4961 dev->reg_state = NETREG_UNREGISTERED;
4964 * Prevent userspace races by waiting until the network
4965 * device is fully setup before sending notifications.
4967 if (!dev->rtnl_link_ops ||
4968 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4969 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
4975 if (dev->netdev_ops->ndo_uninit)
4976 dev->netdev_ops->ndo_uninit(dev);
4979 EXPORT_SYMBOL(register_netdevice);
4982 * init_dummy_netdev - init a dummy network device for NAPI
4983 * @dev: device to init
4985 * This takes a network device structure and initialize the minimum
4986 * amount of fields so it can be used to schedule NAPI polls without
4987 * registering a full blown interface. This is to be used by drivers
4988 * that need to tie several hardware interfaces to a single NAPI
4989 * poll scheduler due to HW limitations.
4991 int init_dummy_netdev(struct net_device *dev)
4993 /* Clear everything. Note we don't initialize spinlocks
4994 * are they aren't supposed to be taken by any of the
4995 * NAPI code and this dummy netdev is supposed to be
4996 * only ever used for NAPI polls
4998 memset(dev, 0, sizeof(struct net_device));
5000 /* make sure we BUG if trying to hit standard
5001 * register/unregister code path
5003 dev->reg_state = NETREG_DUMMY;
5005 /* initialize the ref count */
5006 atomic_set(&dev->refcnt, 1);
5008 /* NAPI wants this */
5009 INIT_LIST_HEAD(&dev->napi_list);
5011 /* a dummy interface is started by default */
5012 set_bit(__LINK_STATE_PRESENT, &dev->state);
5013 set_bit(__LINK_STATE_START, &dev->state);
5017 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5021 * register_netdev - register a network device
5022 * @dev: device to register
5024 * Take a completed network device structure and add it to the kernel
5025 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5026 * chain. 0 is returned on success. A negative errno code is returned
5027 * on a failure to set up the device, or if the name is a duplicate.
5029 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5030 * and expands the device name if you passed a format string to
5033 int register_netdev(struct net_device *dev)
5040 * If the name is a format string the caller wants us to do a
5043 if (strchr(dev->name, '%')) {
5044 err = dev_alloc_name(dev, dev->name);
5049 err = register_netdevice(dev);
5054 EXPORT_SYMBOL(register_netdev);
5057 * netdev_wait_allrefs - wait until all references are gone.
5059 * This is called when unregistering network devices.
5061 * Any protocol or device that holds a reference should register
5062 * for netdevice notification, and cleanup and put back the
5063 * reference if they receive an UNREGISTER event.
5064 * We can get stuck here if buggy protocols don't correctly
5067 static void netdev_wait_allrefs(struct net_device *dev)
5069 unsigned long rebroadcast_time, warning_time;
5071 linkwatch_forget_dev(dev);
5073 rebroadcast_time = warning_time = jiffies;
5074 while (atomic_read(&dev->refcnt) != 0) {
5075 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5078 /* Rebroadcast unregister notification */
5079 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5080 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5081 * should have already handle it the first time */
5083 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5085 /* We must not have linkwatch events
5086 * pending on unregister. If this
5087 * happens, we simply run the queue
5088 * unscheduled, resulting in a noop
5091 linkwatch_run_queue();
5096 rebroadcast_time = jiffies;
5101 if (time_after(jiffies, warning_time + 10 * HZ)) {
5102 printk(KERN_EMERG "unregister_netdevice: "
5103 "waiting for %s to become free. Usage "
5105 dev->name, atomic_read(&dev->refcnt));
5106 warning_time = jiffies;
5115 * register_netdevice(x1);
5116 * register_netdevice(x2);
5118 * unregister_netdevice(y1);
5119 * unregister_netdevice(y2);
5125 * We are invoked by rtnl_unlock().
5126 * This allows us to deal with problems:
5127 * 1) We can delete sysfs objects which invoke hotplug
5128 * without deadlocking with linkwatch via keventd.
5129 * 2) Since we run with the RTNL semaphore not held, we can sleep
5130 * safely in order to wait for the netdev refcnt to drop to zero.
5132 * We must not return until all unregister events added during
5133 * the interval the lock was held have been completed.
5135 void netdev_run_todo(void)
5137 struct list_head list;
5139 /* Snapshot list, allow later requests */
5140 list_replace_init(&net_todo_list, &list);
5144 while (!list_empty(&list)) {
5145 struct net_device *dev
5146 = list_first_entry(&list, struct net_device, todo_list);
5147 list_del(&dev->todo_list);
5149 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5150 printk(KERN_ERR "network todo '%s' but state %d\n",
5151 dev->name, dev->reg_state);
5156 dev->reg_state = NETREG_UNREGISTERED;
5158 on_each_cpu(flush_backlog, dev, 1);
5160 netdev_wait_allrefs(dev);
5163 BUG_ON(atomic_read(&dev->refcnt));
5164 WARN_ON(dev->ip_ptr);
5165 WARN_ON(dev->ip6_ptr);
5166 WARN_ON(dev->dn_ptr);
5168 if (dev->destructor)
5169 dev->destructor(dev);
5171 /* Free network device */
5172 kobject_put(&dev->dev.kobj);
5177 * dev_txq_stats_fold - fold tx_queues stats
5178 * @dev: device to get statistics from
5179 * @stats: struct net_device_stats to hold results
5181 void dev_txq_stats_fold(const struct net_device *dev,
5182 struct net_device_stats *stats)
5184 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5186 struct netdev_queue *txq;
5188 for (i = 0; i < dev->num_tx_queues; i++) {
5189 txq = netdev_get_tx_queue(dev, i);
5190 tx_bytes += txq->tx_bytes;
5191 tx_packets += txq->tx_packets;
5192 tx_dropped += txq->tx_dropped;
5194 if (tx_bytes || tx_packets || tx_dropped) {
5195 stats->tx_bytes = tx_bytes;
5196 stats->tx_packets = tx_packets;
5197 stats->tx_dropped = tx_dropped;
5200 EXPORT_SYMBOL(dev_txq_stats_fold);
5203 * dev_get_stats - get network device statistics
5204 * @dev: device to get statistics from
5206 * Get network statistics from device. The device driver may provide
5207 * its own method by setting dev->netdev_ops->get_stats; otherwise
5208 * the internal statistics structure is used.
5210 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5212 const struct net_device_ops *ops = dev->netdev_ops;
5214 if (ops->ndo_get_stats)
5215 return ops->ndo_get_stats(dev);
5217 dev_txq_stats_fold(dev, &dev->stats);
5220 EXPORT_SYMBOL(dev_get_stats);
5222 static void netdev_init_one_queue(struct net_device *dev,
5223 struct netdev_queue *queue,
5229 static void netdev_init_queues(struct net_device *dev)
5231 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5232 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5233 spin_lock_init(&dev->tx_global_lock);
5237 * alloc_netdev_mq - allocate network device
5238 * @sizeof_priv: size of private data to allocate space for
5239 * @name: device name format string
5240 * @setup: callback to initialize device
5241 * @queue_count: the number of subqueues to allocate
5243 * Allocates a struct net_device with private data area for driver use
5244 * and performs basic initialization. Also allocates subquue structs
5245 * for each queue on the device at the end of the netdevice.
5247 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5248 void (*setup)(struct net_device *), unsigned int queue_count)
5250 struct netdev_queue *tx;
5251 struct net_device *dev;
5253 struct net_device *p;
5255 struct netdev_rx_queue *rx;
5259 BUG_ON(strlen(name) >= sizeof(dev->name));
5261 alloc_size = sizeof(struct net_device);
5263 /* ensure 32-byte alignment of private area */
5264 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5265 alloc_size += sizeof_priv;
5267 /* ensure 32-byte alignment of whole construct */
5268 alloc_size += NETDEV_ALIGN - 1;
5270 p = kzalloc(alloc_size, GFP_KERNEL);
5272 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5276 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5278 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5284 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5286 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5291 atomic_set(&rx->count, queue_count);
5294 * Set a pointer to first element in the array which holds the
5297 for (i = 0; i < queue_count; i++)
5301 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5302 dev->padded = (char *)dev - (char *)p;
5304 if (dev_addr_init(dev))
5310 dev_net_set(dev, &init_net);
5313 dev->num_tx_queues = queue_count;
5314 dev->real_num_tx_queues = queue_count;
5318 dev->num_rx_queues = queue_count;
5321 dev->gso_max_size = GSO_MAX_SIZE;
5323 netdev_init_queues(dev);
5325 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5326 dev->ethtool_ntuple_list.count = 0;
5327 INIT_LIST_HEAD(&dev->napi_list);
5328 INIT_LIST_HEAD(&dev->unreg_list);
5329 INIT_LIST_HEAD(&dev->link_watch_list);
5330 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5332 strcpy(dev->name, name);
5345 EXPORT_SYMBOL(alloc_netdev_mq);
5348 * free_netdev - free network device
5351 * This function does the last stage of destroying an allocated device
5352 * interface. The reference to the device object is released.
5353 * If this is the last reference then it will be freed.
5355 void free_netdev(struct net_device *dev)
5357 struct napi_struct *p, *n;
5359 release_net(dev_net(dev));
5363 /* Flush device addresses */
5364 dev_addr_flush(dev);
5366 /* Clear ethtool n-tuple list */
5367 ethtool_ntuple_flush(dev);
5369 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5372 /* Compatibility with error handling in drivers */
5373 if (dev->reg_state == NETREG_UNINITIALIZED) {
5374 kfree((char *)dev - dev->padded);
5378 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5379 dev->reg_state = NETREG_RELEASED;
5381 /* will free via device release */
5382 put_device(&dev->dev);
5384 EXPORT_SYMBOL(free_netdev);
5387 * synchronize_net - Synchronize with packet receive processing
5389 * Wait for packets currently being received to be done.
5390 * Does not block later packets from starting.
5392 void synchronize_net(void)
5397 EXPORT_SYMBOL(synchronize_net);
5400 * unregister_netdevice_queue - remove device from the kernel
5404 * This function shuts down a device interface and removes it
5405 * from the kernel tables.
5406 * If head not NULL, device is queued to be unregistered later.
5408 * Callers must hold the rtnl semaphore. You may want
5409 * unregister_netdev() instead of this.
5412 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5417 list_move_tail(&dev->unreg_list, head);
5419 rollback_registered(dev);
5420 /* Finish processing unregister after unlock */
5424 EXPORT_SYMBOL(unregister_netdevice_queue);
5427 * unregister_netdevice_many - unregister many devices
5428 * @head: list of devices
5430 void unregister_netdevice_many(struct list_head *head)
5432 struct net_device *dev;
5434 if (!list_empty(head)) {
5435 rollback_registered_many(head);
5436 list_for_each_entry(dev, head, unreg_list)
5440 EXPORT_SYMBOL(unregister_netdevice_many);
5443 * unregister_netdev - remove device from the kernel
5446 * This function shuts down a device interface and removes it
5447 * from the kernel tables.
5449 * This is just a wrapper for unregister_netdevice that takes
5450 * the rtnl semaphore. In general you want to use this and not
5451 * unregister_netdevice.
5453 void unregister_netdev(struct net_device *dev)
5456 unregister_netdevice(dev);
5459 EXPORT_SYMBOL(unregister_netdev);
5462 * dev_change_net_namespace - move device to different nethost namespace
5464 * @net: network namespace
5465 * @pat: If not NULL name pattern to try if the current device name
5466 * is already taken in the destination network namespace.
5468 * This function shuts down a device interface and moves it
5469 * to a new network namespace. On success 0 is returned, on
5470 * a failure a netagive errno code is returned.
5472 * Callers must hold the rtnl semaphore.
5475 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5481 /* Don't allow namespace local devices to be moved. */
5483 if (dev->features & NETIF_F_NETNS_LOCAL)
5487 /* Don't allow real devices to be moved when sysfs
5491 if (dev->dev.parent)
5495 /* Ensure the device has been registrered */
5497 if (dev->reg_state != NETREG_REGISTERED)
5500 /* Get out if there is nothing todo */
5502 if (net_eq(dev_net(dev), net))
5505 /* Pick the destination device name, and ensure
5506 * we can use it in the destination network namespace.
5509 if (__dev_get_by_name(net, dev->name)) {
5510 /* We get here if we can't use the current device name */
5513 if (dev_get_valid_name(net, pat, dev->name, 1))
5518 * And now a mini version of register_netdevice unregister_netdevice.
5521 /* If device is running close it first. */
5524 /* And unlink it from device chain */
5526 unlist_netdevice(dev);
5530 /* Shutdown queueing discipline. */
5533 /* Notify protocols, that we are about to destroy
5534 this device. They should clean all the things.
5536 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5537 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5540 * Flush the unicast and multicast chains
5545 netdev_unregister_kobject(dev);
5547 /* Actually switch the network namespace */
5548 dev_net_set(dev, net);
5550 /* If there is an ifindex conflict assign a new one */
5551 if (__dev_get_by_index(net, dev->ifindex)) {
5552 int iflink = (dev->iflink == dev->ifindex);
5553 dev->ifindex = dev_new_index(net);
5555 dev->iflink = dev->ifindex;
5558 /* Fixup kobjects */
5559 err = netdev_register_kobject(dev);
5562 /* Add the device back in the hashes */
5563 list_netdevice(dev);
5565 /* Notify protocols, that a new device appeared. */
5566 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5569 * Prevent userspace races by waiting until the network
5570 * device is fully setup before sending notifications.
5572 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5579 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5581 static int dev_cpu_callback(struct notifier_block *nfb,
5582 unsigned long action,
5585 struct sk_buff **list_skb;
5586 struct Qdisc **list_net;
5587 struct sk_buff *skb;
5588 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5589 struct softnet_data *sd, *oldsd;
5591 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5594 local_irq_disable();
5595 cpu = smp_processor_id();
5596 sd = &per_cpu(softnet_data, cpu);
5597 oldsd = &per_cpu(softnet_data, oldcpu);
5599 /* Find end of our completion_queue. */
5600 list_skb = &sd->completion_queue;
5602 list_skb = &(*list_skb)->next;
5603 /* Append completion queue from offline CPU. */
5604 *list_skb = oldsd->completion_queue;
5605 oldsd->completion_queue = NULL;
5607 /* Find end of our output_queue. */
5608 list_net = &sd->output_queue;
5610 list_net = &(*list_net)->next_sched;
5611 /* Append output queue from offline CPU. */
5612 *list_net = oldsd->output_queue;
5613 oldsd->output_queue = NULL;
5615 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5618 /* Process offline CPU's input_pkt_queue */
5619 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5621 input_queue_head_incr(oldsd);
5629 * netdev_increment_features - increment feature set by one
5630 * @all: current feature set
5631 * @one: new feature set
5632 * @mask: mask feature set
5634 * Computes a new feature set after adding a device with feature set
5635 * @one to the master device with current feature set @all. Will not
5636 * enable anything that is off in @mask. Returns the new feature set.
5638 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5641 /* If device needs checksumming, downgrade to it. */
5642 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5643 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5644 else if (mask & NETIF_F_ALL_CSUM) {
5645 /* If one device supports v4/v6 checksumming, set for all. */
5646 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5647 !(all & NETIF_F_GEN_CSUM)) {
5648 all &= ~NETIF_F_ALL_CSUM;
5649 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5652 /* If one device supports hw checksumming, set for all. */
5653 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5654 all &= ~NETIF_F_ALL_CSUM;
5655 all |= NETIF_F_HW_CSUM;
5659 one |= NETIF_F_ALL_CSUM;
5661 one |= all & NETIF_F_ONE_FOR_ALL;
5662 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5663 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5667 EXPORT_SYMBOL(netdev_increment_features);
5669 static struct hlist_head *netdev_create_hash(void)
5672 struct hlist_head *hash;
5674 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5676 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5677 INIT_HLIST_HEAD(&hash[i]);
5682 /* Initialize per network namespace state */
5683 static int __net_init netdev_init(struct net *net)
5685 INIT_LIST_HEAD(&net->dev_base_head);
5687 net->dev_name_head = netdev_create_hash();
5688 if (net->dev_name_head == NULL)
5691 net->dev_index_head = netdev_create_hash();
5692 if (net->dev_index_head == NULL)
5698 kfree(net->dev_name_head);
5704 * netdev_drivername - network driver for the device
5705 * @dev: network device
5706 * @buffer: buffer for resulting name
5707 * @len: size of buffer
5709 * Determine network driver for device.
5711 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5713 const struct device_driver *driver;
5714 const struct device *parent;
5716 if (len <= 0 || !buffer)
5720 parent = dev->dev.parent;
5725 driver = parent->driver;
5726 if (driver && driver->name)
5727 strlcpy(buffer, driver->name, len);
5731 static void __net_exit netdev_exit(struct net *net)
5733 kfree(net->dev_name_head);
5734 kfree(net->dev_index_head);
5737 static struct pernet_operations __net_initdata netdev_net_ops = {
5738 .init = netdev_init,
5739 .exit = netdev_exit,
5742 static void __net_exit default_device_exit(struct net *net)
5744 struct net_device *dev, *aux;
5746 * Push all migratable network devices back to the
5747 * initial network namespace
5750 for_each_netdev_safe(net, dev, aux) {
5752 char fb_name[IFNAMSIZ];
5754 /* Ignore unmoveable devices (i.e. loopback) */
5755 if (dev->features & NETIF_F_NETNS_LOCAL)
5758 /* Leave virtual devices for the generic cleanup */
5759 if (dev->rtnl_link_ops)
5762 /* Push remaing network devices to init_net */
5763 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5764 err = dev_change_net_namespace(dev, &init_net, fb_name);
5766 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5767 __func__, dev->name, err);
5774 static void __net_exit default_device_exit_batch(struct list_head *net_list)
5776 /* At exit all network devices most be removed from a network
5777 * namespace. Do this in the reverse order of registeration.
5778 * Do this across as many network namespaces as possible to
5779 * improve batching efficiency.
5781 struct net_device *dev;
5783 LIST_HEAD(dev_kill_list);
5786 list_for_each_entry(net, net_list, exit_list) {
5787 for_each_netdev_reverse(net, dev) {
5788 if (dev->rtnl_link_ops)
5789 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
5791 unregister_netdevice_queue(dev, &dev_kill_list);
5794 unregister_netdevice_many(&dev_kill_list);
5798 static struct pernet_operations __net_initdata default_device_ops = {
5799 .exit = default_device_exit,
5800 .exit_batch = default_device_exit_batch,
5804 * Initialize the DEV module. At boot time this walks the device list and
5805 * unhooks any devices that fail to initialise (normally hardware not
5806 * present) and leaves us with a valid list of present and active devices.
5811 * This is called single threaded during boot, so no need
5812 * to take the rtnl semaphore.
5814 static int __init net_dev_init(void)
5816 int i, rc = -ENOMEM;
5818 BUG_ON(!dev_boot_phase);
5820 if (dev_proc_init())
5823 if (netdev_kobject_init())
5826 INIT_LIST_HEAD(&ptype_all);
5827 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5828 INIT_LIST_HEAD(&ptype_base[i]);
5830 if (register_pernet_subsys(&netdev_net_ops))
5834 * Initialise the packet receive queues.
5837 for_each_possible_cpu(i) {
5838 struct softnet_data *sd = &per_cpu(softnet_data, i);
5840 skb_queue_head_init(&sd->input_pkt_queue);
5841 sd->completion_queue = NULL;
5842 INIT_LIST_HEAD(&sd->poll_list);
5845 sd->csd.func = rps_trigger_softirq;
5851 sd->backlog.poll = process_backlog;
5852 sd->backlog.weight = weight_p;
5853 sd->backlog.gro_list = NULL;
5854 sd->backlog.gro_count = 0;
5859 /* The loopback device is special if any other network devices
5860 * is present in a network namespace the loopback device must
5861 * be present. Since we now dynamically allocate and free the
5862 * loopback device ensure this invariant is maintained by
5863 * keeping the loopback device as the first device on the
5864 * list of network devices. Ensuring the loopback devices
5865 * is the first device that appears and the last network device
5868 if (register_pernet_device(&loopback_net_ops))
5871 if (register_pernet_device(&default_device_ops))
5874 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5875 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5877 hotcpu_notifier(dev_cpu_callback, 0);
5885 subsys_initcall(net_dev_init);
5887 static int __init initialize_hashrnd(void)
5889 get_random_bytes(&hashrnd, sizeof(hashrnd));
5893 late_initcall_sync(initialize_hashrnd);