2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
104 #include <linux/if_bridge.h>
105 #include <linux/if_macvlan.h>
107 #include <net/pkt_sched.h>
108 #include <net/checksum.h>
109 #include <net/xfrm.h>
110 #include <linux/highmem.h>
111 #include <linux/init.h>
112 #include <linux/kmod.h>
113 #include <linux/module.h>
114 #include <linux/netpoll.h>
115 #include <linux/rcupdate.h>
116 #include <linux/delay.h>
117 #include <net/wext.h>
118 #include <net/iw_handler.h>
119 #include <asm/current.h>
120 #include <linux/audit.h>
121 #include <linux/dmaengine.h>
122 #include <linux/err.h>
123 #include <linux/ctype.h>
124 #include <linux/if_arp.h>
125 #include <linux/if_vlan.h>
126 #include <linux/ip.h>
128 #include <linux/ipv6.h>
129 #include <linux/in.h>
130 #include <linux/jhash.h>
131 #include <linux/random.h>
132 #include <trace/events/napi.h>
133 #include <linux/pci.h>
135 #include "net-sysfs.h"
137 /* Instead of increasing this, you should create a hash table. */
138 #define MAX_GRO_SKBS 8
140 /* This should be increased if a protocol with a bigger head is added. */
141 #define GRO_MAX_HEAD (MAX_HEADER + 128)
144 * The list of packet types we will receive (as opposed to discard)
145 * and the routines to invoke.
147 * Why 16. Because with 16 the only overlap we get on a hash of the
148 * low nibble of the protocol value is RARP/SNAP/X.25.
150 * NOTE: That is no longer true with the addition of VLAN tags. Not
151 * sure which should go first, but I bet it won't make much
152 * difference if we are running VLANs. The good news is that
153 * this protocol won't be in the list unless compiled in, so
154 * the average user (w/out VLANs) will not be adversely affected.
171 #define PTYPE_HASH_SIZE (16)
172 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
174 static DEFINE_SPINLOCK(ptype_lock);
175 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
176 static struct list_head ptype_all __read_mostly; /* Taps */
179 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
182 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
184 * Writers must hold the rtnl semaphore while they loop through the
185 * dev_base_head list, and hold dev_base_lock for writing when they do the
186 * actual updates. This allows pure readers to access the list even
187 * while a writer is preparing to update it.
189 * To put it another way, dev_base_lock is held for writing only to
190 * protect against pure readers; the rtnl semaphore provides the
191 * protection against other writers.
193 * See, for example usages, register_netdevice() and
194 * unregister_netdevice(), which must be called with the rtnl
197 DEFINE_RWLOCK(dev_base_lock);
198 EXPORT_SYMBOL(dev_base_lock);
200 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
202 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
203 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
206 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
208 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
211 static inline void rps_lock(struct softnet_data *sd)
214 spin_lock(&sd->input_pkt_queue.lock);
218 static inline void rps_unlock(struct softnet_data *sd)
221 spin_unlock(&sd->input_pkt_queue.lock);
225 /* Device list insertion */
226 static int list_netdevice(struct net_device *dev)
228 struct net *net = dev_net(dev);
232 write_lock_bh(&dev_base_lock);
233 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
234 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
235 hlist_add_head_rcu(&dev->index_hlist,
236 dev_index_hash(net, dev->ifindex));
237 write_unlock_bh(&dev_base_lock);
241 /* Device list removal
242 * caller must respect a RCU grace period before freeing/reusing dev
244 static void unlist_netdevice(struct net_device *dev)
248 /* Unlink dev from the device chain */
249 write_lock_bh(&dev_base_lock);
250 list_del_rcu(&dev->dev_list);
251 hlist_del_rcu(&dev->name_hlist);
252 hlist_del_rcu(&dev->index_hlist);
253 write_unlock_bh(&dev_base_lock);
260 static RAW_NOTIFIER_HEAD(netdev_chain);
263 * Device drivers call our routines to queue packets here. We empty the
264 * queue in the local softnet handler.
267 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
268 EXPORT_PER_CPU_SYMBOL(softnet_data);
270 #ifdef CONFIG_LOCKDEP
272 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
273 * according to dev->type
275 static const unsigned short netdev_lock_type[] =
276 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
277 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
278 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
279 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
280 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
281 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
282 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
283 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
284 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
285 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
286 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
287 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
288 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
289 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
290 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
291 ARPHRD_VOID, ARPHRD_NONE};
293 static const char *const netdev_lock_name[] =
294 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
295 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
296 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
297 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
298 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
299 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
300 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
301 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
302 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
303 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
304 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
305 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
306 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
307 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
308 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
309 "_xmit_VOID", "_xmit_NONE"};
311 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
312 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
314 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
318 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
319 if (netdev_lock_type[i] == dev_type)
321 /* the last key is used by default */
322 return ARRAY_SIZE(netdev_lock_type) - 1;
325 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
326 unsigned short dev_type)
330 i = netdev_lock_pos(dev_type);
331 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
332 netdev_lock_name[i]);
335 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
339 i = netdev_lock_pos(dev->type);
340 lockdep_set_class_and_name(&dev->addr_list_lock,
341 &netdev_addr_lock_key[i],
342 netdev_lock_name[i]);
345 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
346 unsigned short dev_type)
349 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
354 /*******************************************************************************
356 Protocol management and registration routines
358 *******************************************************************************/
361 * Add a protocol ID to the list. Now that the input handler is
362 * smarter we can dispense with all the messy stuff that used to be
365 * BEWARE!!! Protocol handlers, mangling input packets,
366 * MUST BE last in hash buckets and checking protocol handlers
367 * MUST start from promiscuous ptype_all chain in net_bh.
368 * It is true now, do not change it.
369 * Explanation follows: if protocol handler, mangling packet, will
370 * be the first on list, it is not able to sense, that packet
371 * is cloned and should be copied-on-write, so that it will
372 * change it and subsequent readers will get broken packet.
377 * dev_add_pack - add packet handler
378 * @pt: packet type declaration
380 * Add a protocol handler to the networking stack. The passed &packet_type
381 * is linked into kernel lists and may not be freed until it has been
382 * removed from the kernel lists.
384 * This call does not sleep therefore it can not
385 * guarantee all CPU's that are in middle of receiving packets
386 * will see the new packet type (until the next received packet).
389 void dev_add_pack(struct packet_type *pt)
393 spin_lock_bh(&ptype_lock);
394 if (pt->type == htons(ETH_P_ALL))
395 list_add_rcu(&pt->list, &ptype_all);
397 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
398 list_add_rcu(&pt->list, &ptype_base[hash]);
400 spin_unlock_bh(&ptype_lock);
402 EXPORT_SYMBOL(dev_add_pack);
405 * __dev_remove_pack - remove packet handler
406 * @pt: packet type declaration
408 * Remove a protocol handler that was previously added to the kernel
409 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
410 * from the kernel lists and can be freed or reused once this function
413 * The packet type might still be in use by receivers
414 * and must not be freed until after all the CPU's have gone
415 * through a quiescent state.
417 void __dev_remove_pack(struct packet_type *pt)
419 struct list_head *head;
420 struct packet_type *pt1;
422 spin_lock_bh(&ptype_lock);
424 if (pt->type == htons(ETH_P_ALL))
427 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
429 list_for_each_entry(pt1, head, list) {
431 list_del_rcu(&pt->list);
436 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
438 spin_unlock_bh(&ptype_lock);
440 EXPORT_SYMBOL(__dev_remove_pack);
443 * dev_remove_pack - remove packet handler
444 * @pt: packet type declaration
446 * Remove a protocol handler that was previously added to the kernel
447 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
448 * from the kernel lists and can be freed or reused once this function
451 * This call sleeps to guarantee that no CPU is looking at the packet
454 void dev_remove_pack(struct packet_type *pt)
456 __dev_remove_pack(pt);
460 EXPORT_SYMBOL(dev_remove_pack);
462 /******************************************************************************
464 Device Boot-time Settings Routines
466 *******************************************************************************/
468 /* Boot time configuration table */
469 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
472 * netdev_boot_setup_add - add new setup entry
473 * @name: name of the device
474 * @map: configured settings for the device
476 * Adds new setup entry to the dev_boot_setup list. The function
477 * returns 0 on error and 1 on success. This is a generic routine to
480 static int netdev_boot_setup_add(char *name, struct ifmap *map)
482 struct netdev_boot_setup *s;
486 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
487 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
488 memset(s[i].name, 0, sizeof(s[i].name));
489 strlcpy(s[i].name, name, IFNAMSIZ);
490 memcpy(&s[i].map, map, sizeof(s[i].map));
495 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
499 * netdev_boot_setup_check - check boot time settings
500 * @dev: the netdevice
502 * Check boot time settings for the device.
503 * The found settings are set for the device to be used
504 * later in the device probing.
505 * Returns 0 if no settings found, 1 if they are.
507 int netdev_boot_setup_check(struct net_device *dev)
509 struct netdev_boot_setup *s = dev_boot_setup;
512 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
513 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
514 !strcmp(dev->name, s[i].name)) {
515 dev->irq = s[i].map.irq;
516 dev->base_addr = s[i].map.base_addr;
517 dev->mem_start = s[i].map.mem_start;
518 dev->mem_end = s[i].map.mem_end;
524 EXPORT_SYMBOL(netdev_boot_setup_check);
528 * netdev_boot_base - get address from boot time settings
529 * @prefix: prefix for network device
530 * @unit: id for network device
532 * Check boot time settings for the base address of device.
533 * The found settings are set for the device to be used
534 * later in the device probing.
535 * Returns 0 if no settings found.
537 unsigned long netdev_boot_base(const char *prefix, int unit)
539 const struct netdev_boot_setup *s = dev_boot_setup;
543 sprintf(name, "%s%d", prefix, unit);
546 * If device already registered then return base of 1
547 * to indicate not to probe for this interface
549 if (__dev_get_by_name(&init_net, name))
552 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
553 if (!strcmp(name, s[i].name))
554 return s[i].map.base_addr;
559 * Saves at boot time configured settings for any netdevice.
561 int __init netdev_boot_setup(char *str)
566 str = get_options(str, ARRAY_SIZE(ints), ints);
571 memset(&map, 0, sizeof(map));
575 map.base_addr = ints[2];
577 map.mem_start = ints[3];
579 map.mem_end = ints[4];
581 /* Add new entry to the list */
582 return netdev_boot_setup_add(str, &map);
585 __setup("netdev=", netdev_boot_setup);
587 /*******************************************************************************
589 Device Interface Subroutines
591 *******************************************************************************/
594 * __dev_get_by_name - find a device by its name
595 * @net: the applicable net namespace
596 * @name: name to find
598 * Find an interface by name. Must be called under RTNL semaphore
599 * or @dev_base_lock. If the name is found a pointer to the device
600 * is returned. If the name is not found then %NULL is returned. The
601 * reference counters are not incremented so the caller must be
602 * careful with locks.
605 struct net_device *__dev_get_by_name(struct net *net, const char *name)
607 struct hlist_node *p;
608 struct net_device *dev;
609 struct hlist_head *head = dev_name_hash(net, name);
611 hlist_for_each_entry(dev, p, head, name_hlist)
612 if (!strncmp(dev->name, name, IFNAMSIZ))
617 EXPORT_SYMBOL(__dev_get_by_name);
620 * dev_get_by_name_rcu - find a device by its name
621 * @net: the applicable net namespace
622 * @name: name to find
624 * Find an interface by name.
625 * If the name is found a pointer to the device is returned.
626 * If the name is not found then %NULL is returned.
627 * The reference counters are not incremented so the caller must be
628 * careful with locks. The caller must hold RCU lock.
631 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
633 struct hlist_node *p;
634 struct net_device *dev;
635 struct hlist_head *head = dev_name_hash(net, name);
637 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
638 if (!strncmp(dev->name, name, IFNAMSIZ))
643 EXPORT_SYMBOL(dev_get_by_name_rcu);
646 * dev_get_by_name - find a device by its name
647 * @net: the applicable net namespace
648 * @name: name to find
650 * Find an interface by name. This can be called from any
651 * context and does its own locking. The returned handle has
652 * the usage count incremented and the caller must use dev_put() to
653 * release it when it is no longer needed. %NULL is returned if no
654 * matching device is found.
657 struct net_device *dev_get_by_name(struct net *net, const char *name)
659 struct net_device *dev;
662 dev = dev_get_by_name_rcu(net, name);
668 EXPORT_SYMBOL(dev_get_by_name);
671 * __dev_get_by_index - find a device by its ifindex
672 * @net: the applicable net namespace
673 * @ifindex: index of device
675 * Search for an interface by index. Returns %NULL if the device
676 * is not found or a pointer to the device. The device has not
677 * had its reference counter increased so the caller must be careful
678 * about locking. The caller must hold either the RTNL semaphore
682 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
684 struct hlist_node *p;
685 struct net_device *dev;
686 struct hlist_head *head = dev_index_hash(net, ifindex);
688 hlist_for_each_entry(dev, p, head, index_hlist)
689 if (dev->ifindex == ifindex)
694 EXPORT_SYMBOL(__dev_get_by_index);
697 * dev_get_by_index_rcu - find a device by its ifindex
698 * @net: the applicable net namespace
699 * @ifindex: index of device
701 * Search for an interface by index. Returns %NULL if the device
702 * is not found or a pointer to the device. The device has not
703 * had its reference counter increased so the caller must be careful
704 * about locking. The caller must hold RCU lock.
707 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
709 struct hlist_node *p;
710 struct net_device *dev;
711 struct hlist_head *head = dev_index_hash(net, ifindex);
713 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
714 if (dev->ifindex == ifindex)
719 EXPORT_SYMBOL(dev_get_by_index_rcu);
723 * dev_get_by_index - find a device by its ifindex
724 * @net: the applicable net namespace
725 * @ifindex: index of device
727 * Search for an interface by index. Returns NULL if the device
728 * is not found or a pointer to the device. The device returned has
729 * had a reference added and the pointer is safe until the user calls
730 * dev_put to indicate they have finished with it.
733 struct net_device *dev_get_by_index(struct net *net, int ifindex)
735 struct net_device *dev;
738 dev = dev_get_by_index_rcu(net, ifindex);
744 EXPORT_SYMBOL(dev_get_by_index);
747 * dev_getbyhwaddr - find a device by its hardware address
748 * @net: the applicable net namespace
749 * @type: media type of device
750 * @ha: hardware address
752 * Search for an interface by MAC address. Returns NULL if the device
753 * is not found or a pointer to the device. The caller must hold the
754 * rtnl semaphore. The returned device has not had its ref count increased
755 * and the caller must therefore be careful about locking
758 * If the API was consistent this would be __dev_get_by_hwaddr
761 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
763 struct net_device *dev;
767 for_each_netdev(net, dev)
768 if (dev->type == type &&
769 !memcmp(dev->dev_addr, ha, dev->addr_len))
774 EXPORT_SYMBOL(dev_getbyhwaddr);
776 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
778 struct net_device *dev;
781 for_each_netdev(net, dev)
782 if (dev->type == type)
787 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
789 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
791 struct net_device *dev, *ret = NULL;
794 for_each_netdev_rcu(net, dev)
795 if (dev->type == type) {
803 EXPORT_SYMBOL(dev_getfirstbyhwtype);
806 * dev_get_by_flags - find any device with given flags
807 * @net: the applicable net namespace
808 * @if_flags: IFF_* values
809 * @mask: bitmask of bits in if_flags to check
811 * Search for any interface with the given flags. Returns NULL if a device
812 * is not found or a pointer to the device. The device returned has
813 * had a reference added and the pointer is safe until the user calls
814 * dev_put to indicate they have finished with it.
817 struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
820 struct net_device *dev, *ret;
824 for_each_netdev_rcu(net, dev) {
825 if (((dev->flags ^ if_flags) & mask) == 0) {
834 EXPORT_SYMBOL(dev_get_by_flags);
837 * dev_valid_name - check if name is okay for network device
840 * Network device names need to be valid file names to
841 * to allow sysfs to work. We also disallow any kind of
844 int dev_valid_name(const char *name)
848 if (strlen(name) >= IFNAMSIZ)
850 if (!strcmp(name, ".") || !strcmp(name, ".."))
854 if (*name == '/' || isspace(*name))
860 EXPORT_SYMBOL(dev_valid_name);
863 * __dev_alloc_name - allocate a name for a device
864 * @net: network namespace to allocate the device name in
865 * @name: name format string
866 * @buf: scratch buffer and result name string
868 * Passed a format string - eg "lt%d" it will try and find a suitable
869 * id. It scans list of devices to build up a free map, then chooses
870 * the first empty slot. The caller must hold the dev_base or rtnl lock
871 * while allocating the name and adding the device in order to avoid
873 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
874 * Returns the number of the unit assigned or a negative errno code.
877 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
881 const int max_netdevices = 8*PAGE_SIZE;
882 unsigned long *inuse;
883 struct net_device *d;
885 p = strnchr(name, IFNAMSIZ-1, '%');
888 * Verify the string as this thing may have come from
889 * the user. There must be either one "%d" and no other "%"
892 if (p[1] != 'd' || strchr(p + 2, '%'))
895 /* Use one page as a bit array of possible slots */
896 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
900 for_each_netdev(net, d) {
901 if (!sscanf(d->name, name, &i))
903 if (i < 0 || i >= max_netdevices)
906 /* avoid cases where sscanf is not exact inverse of printf */
907 snprintf(buf, IFNAMSIZ, name, i);
908 if (!strncmp(buf, d->name, IFNAMSIZ))
912 i = find_first_zero_bit(inuse, max_netdevices);
913 free_page((unsigned long) inuse);
917 snprintf(buf, IFNAMSIZ, name, i);
918 if (!__dev_get_by_name(net, buf))
921 /* It is possible to run out of possible slots
922 * when the name is long and there isn't enough space left
923 * for the digits, or if all bits are used.
929 * dev_alloc_name - allocate a name for a device
931 * @name: name format string
933 * Passed a format string - eg "lt%d" it will try and find a suitable
934 * id. It scans list of devices to build up a free map, then chooses
935 * the first empty slot. The caller must hold the dev_base or rtnl lock
936 * while allocating the name and adding the device in order to avoid
938 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
939 * Returns the number of the unit assigned or a negative errno code.
942 int dev_alloc_name(struct net_device *dev, const char *name)
948 BUG_ON(!dev_net(dev));
950 ret = __dev_alloc_name(net, name, buf);
952 strlcpy(dev->name, buf, IFNAMSIZ);
955 EXPORT_SYMBOL(dev_alloc_name);
957 static int dev_get_valid_name(struct net *net, const char *name, char *buf,
960 if (!dev_valid_name(name))
963 if (fmt && strchr(name, '%'))
964 return __dev_alloc_name(net, name, buf);
965 else if (__dev_get_by_name(net, name))
967 else if (buf != name)
968 strlcpy(buf, name, IFNAMSIZ);
974 * dev_change_name - change name of a device
976 * @newname: name (or format string) must be at least IFNAMSIZ
978 * Change name of a device, can pass format strings "eth%d".
981 int dev_change_name(struct net_device *dev, const char *newname)
983 char oldname[IFNAMSIZ];
989 BUG_ON(!dev_net(dev));
992 if (dev->flags & IFF_UP)
995 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
998 memcpy(oldname, dev->name, IFNAMSIZ);
1000 err = dev_get_valid_name(net, newname, dev->name, 1);
1005 /* For now only devices in the initial network namespace
1008 if (net_eq(net, &init_net)) {
1009 ret = device_rename(&dev->dev, dev->name);
1011 memcpy(dev->name, oldname, IFNAMSIZ);
1016 write_lock_bh(&dev_base_lock);
1017 hlist_del(&dev->name_hlist);
1018 write_unlock_bh(&dev_base_lock);
1022 write_lock_bh(&dev_base_lock);
1023 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1024 write_unlock_bh(&dev_base_lock);
1026 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1027 ret = notifier_to_errno(ret);
1030 /* err >= 0 after dev_alloc_name() or stores the first errno */
1033 memcpy(dev->name, oldname, IFNAMSIZ);
1037 "%s: name change rollback failed: %d.\n",
1046 * dev_set_alias - change ifalias of a device
1048 * @alias: name up to IFALIASZ
1049 * @len: limit of bytes to copy from info
1051 * Set ifalias for a device,
1053 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1057 if (len >= IFALIASZ)
1062 kfree(dev->ifalias);
1063 dev->ifalias = NULL;
1068 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1072 strlcpy(dev->ifalias, alias, len+1);
1078 * netdev_features_change - device changes features
1079 * @dev: device to cause notification
1081 * Called to indicate a device has changed features.
1083 void netdev_features_change(struct net_device *dev)
1085 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1087 EXPORT_SYMBOL(netdev_features_change);
1090 * netdev_state_change - device changes state
1091 * @dev: device to cause notification
1093 * Called to indicate a device has changed state. This function calls
1094 * the notifier chains for netdev_chain and sends a NEWLINK message
1095 * to the routing socket.
1097 void netdev_state_change(struct net_device *dev)
1099 if (dev->flags & IFF_UP) {
1100 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1101 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1104 EXPORT_SYMBOL(netdev_state_change);
1106 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1108 return call_netdevice_notifiers(event, dev);
1110 EXPORT_SYMBOL(netdev_bonding_change);
1113 * dev_load - load a network module
1114 * @net: the applicable net namespace
1115 * @name: name of interface
1117 * If a network interface is not present and the process has suitable
1118 * privileges this function loads the module. If module loading is not
1119 * available in this kernel then it becomes a nop.
1122 void dev_load(struct net *net, const char *name)
1124 struct net_device *dev;
1127 dev = dev_get_by_name_rcu(net, name);
1130 if (!dev && capable(CAP_NET_ADMIN))
1131 request_module("%s", name);
1133 EXPORT_SYMBOL(dev_load);
1135 static int __dev_open(struct net_device *dev)
1137 const struct net_device_ops *ops = dev->netdev_ops;
1143 * Is it even present?
1145 if (!netif_device_present(dev))
1148 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1149 ret = notifier_to_errno(ret);
1154 * Call device private open method
1156 set_bit(__LINK_STATE_START, &dev->state);
1158 if (ops->ndo_validate_addr)
1159 ret = ops->ndo_validate_addr(dev);
1161 if (!ret && ops->ndo_open)
1162 ret = ops->ndo_open(dev);
1165 * If it went open OK then:
1169 clear_bit(__LINK_STATE_START, &dev->state);
1174 dev->flags |= IFF_UP;
1179 net_dmaengine_get();
1182 * Initialize multicasting status
1184 dev_set_rx_mode(dev);
1187 * Wakeup transmit queue engine
1196 * dev_open - prepare an interface for use.
1197 * @dev: device to open
1199 * Takes a device from down to up state. The device's private open
1200 * function is invoked and then the multicast lists are loaded. Finally
1201 * the device is moved into the up state and a %NETDEV_UP message is
1202 * sent to the netdev notifier chain.
1204 * Calling this function on an active interface is a nop. On a failure
1205 * a negative errno code is returned.
1207 int dev_open(struct net_device *dev)
1214 if (dev->flags & IFF_UP)
1220 ret = __dev_open(dev);
1225 * ... and announce new interface.
1227 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1228 call_netdevice_notifiers(NETDEV_UP, dev);
1232 EXPORT_SYMBOL(dev_open);
1234 static int __dev_close(struct net_device *dev)
1236 const struct net_device_ops *ops = dev->netdev_ops;
1242 * Tell people we are going down, so that they can
1243 * prepare to death, when device is still operating.
1245 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1247 clear_bit(__LINK_STATE_START, &dev->state);
1249 /* Synchronize to scheduled poll. We cannot touch poll list,
1250 * it can be even on different cpu. So just clear netif_running().
1252 * dev->stop() will invoke napi_disable() on all of it's
1253 * napi_struct instances on this device.
1255 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1257 dev_deactivate(dev);
1260 * Call the device specific close. This cannot fail.
1261 * Only if device is UP
1263 * We allow it to be called even after a DETACH hot-plug
1270 * Device is now down.
1273 dev->flags &= ~IFF_UP;
1278 net_dmaengine_put();
1284 * dev_close - shutdown an interface.
1285 * @dev: device to shutdown
1287 * This function moves an active device into down state. A
1288 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1289 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1292 int dev_close(struct net_device *dev)
1294 if (!(dev->flags & IFF_UP))
1300 * Tell people we are down
1302 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1303 call_netdevice_notifiers(NETDEV_DOWN, dev);
1307 EXPORT_SYMBOL(dev_close);
1311 * dev_disable_lro - disable Large Receive Offload on a device
1314 * Disable Large Receive Offload (LRO) on a net device. Must be
1315 * called under RTNL. This is needed if received packets may be
1316 * forwarded to another interface.
1318 void dev_disable_lro(struct net_device *dev)
1320 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1321 dev->ethtool_ops->set_flags) {
1322 u32 flags = dev->ethtool_ops->get_flags(dev);
1323 if (flags & ETH_FLAG_LRO) {
1324 flags &= ~ETH_FLAG_LRO;
1325 dev->ethtool_ops->set_flags(dev, flags);
1328 WARN_ON(dev->features & NETIF_F_LRO);
1330 EXPORT_SYMBOL(dev_disable_lro);
1333 static int dev_boot_phase = 1;
1336 * Device change register/unregister. These are not inline or static
1337 * as we export them to the world.
1341 * register_netdevice_notifier - register a network notifier block
1344 * Register a notifier to be called when network device events occur.
1345 * The notifier passed is linked into the kernel structures and must
1346 * not be reused until it has been unregistered. A negative errno code
1347 * is returned on a failure.
1349 * When registered all registration and up events are replayed
1350 * to the new notifier to allow device to have a race free
1351 * view of the network device list.
1354 int register_netdevice_notifier(struct notifier_block *nb)
1356 struct net_device *dev;
1357 struct net_device *last;
1362 err = raw_notifier_chain_register(&netdev_chain, nb);
1368 for_each_netdev(net, dev) {
1369 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1370 err = notifier_to_errno(err);
1374 if (!(dev->flags & IFF_UP))
1377 nb->notifier_call(nb, NETDEV_UP, dev);
1388 for_each_netdev(net, dev) {
1392 if (dev->flags & IFF_UP) {
1393 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1394 nb->notifier_call(nb, NETDEV_DOWN, dev);
1396 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1397 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1401 raw_notifier_chain_unregister(&netdev_chain, nb);
1404 EXPORT_SYMBOL(register_netdevice_notifier);
1407 * unregister_netdevice_notifier - unregister a network notifier block
1410 * Unregister a notifier previously registered by
1411 * register_netdevice_notifier(). The notifier is unlinked into the
1412 * kernel structures and may then be reused. A negative errno code
1413 * is returned on a failure.
1416 int unregister_netdevice_notifier(struct notifier_block *nb)
1421 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1425 EXPORT_SYMBOL(unregister_netdevice_notifier);
1428 * call_netdevice_notifiers - call all network notifier blocks
1429 * @val: value passed unmodified to notifier function
1430 * @dev: net_device pointer passed unmodified to notifier function
1432 * Call all network notifier blocks. Parameters and return value
1433 * are as for raw_notifier_call_chain().
1436 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1439 return raw_notifier_call_chain(&netdev_chain, val, dev);
1442 /* When > 0 there are consumers of rx skb time stamps */
1443 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1445 void net_enable_timestamp(void)
1447 atomic_inc(&netstamp_needed);
1449 EXPORT_SYMBOL(net_enable_timestamp);
1451 void net_disable_timestamp(void)
1453 atomic_dec(&netstamp_needed);
1455 EXPORT_SYMBOL(net_disable_timestamp);
1457 static inline void net_timestamp(struct sk_buff *skb)
1459 if (atomic_read(&netstamp_needed))
1460 __net_timestamp(skb);
1462 skb->tstamp.tv64 = 0;
1466 * dev_forward_skb - loopback an skb to another netif
1468 * @dev: destination network device
1469 * @skb: buffer to forward
1472 * NET_RX_SUCCESS (no congestion)
1473 * NET_RX_DROP (packet was dropped)
1475 * dev_forward_skb can be used for injecting an skb from the
1476 * start_xmit function of one device into the receive queue
1477 * of another device.
1479 * The receiving device may be in another namespace, so
1480 * we have to clear all information in the skb that could
1481 * impact namespace isolation.
1483 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1487 if (!(dev->flags & IFF_UP))
1490 if (skb->len > (dev->mtu + dev->hard_header_len))
1493 skb_set_dev(skb, dev);
1494 skb->tstamp.tv64 = 0;
1495 skb->pkt_type = PACKET_HOST;
1496 skb->protocol = eth_type_trans(skb, dev);
1497 return netif_rx(skb);
1499 EXPORT_SYMBOL_GPL(dev_forward_skb);
1502 * Support routine. Sends outgoing frames to any network
1503 * taps currently in use.
1506 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1508 struct packet_type *ptype;
1510 #ifdef CONFIG_NET_CLS_ACT
1511 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1518 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1519 /* Never send packets back to the socket
1520 * they originated from - MvS (miquels@drinkel.ow.org)
1522 if ((ptype->dev == dev || !ptype->dev) &&
1523 (ptype->af_packet_priv == NULL ||
1524 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1525 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1529 /* skb->nh should be correctly
1530 set by sender, so that the second statement is
1531 just protection against buggy protocols.
1533 skb_reset_mac_header(skb2);
1535 if (skb_network_header(skb2) < skb2->data ||
1536 skb2->network_header > skb2->tail) {
1537 if (net_ratelimit())
1538 printk(KERN_CRIT "protocol %04x is "
1540 skb2->protocol, dev->name);
1541 skb_reset_network_header(skb2);
1544 skb2->transport_header = skb2->network_header;
1545 skb2->pkt_type = PACKET_OUTGOING;
1546 ptype->func(skb2, skb->dev, ptype, skb->dev);
1553 static inline void __netif_reschedule(struct Qdisc *q)
1555 struct softnet_data *sd;
1556 unsigned long flags;
1558 local_irq_save(flags);
1559 sd = &__get_cpu_var(softnet_data);
1560 q->next_sched = sd->output_queue;
1561 sd->output_queue = q;
1562 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1563 local_irq_restore(flags);
1566 void __netif_schedule(struct Qdisc *q)
1568 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1569 __netif_reschedule(q);
1571 EXPORT_SYMBOL(__netif_schedule);
1573 void dev_kfree_skb_irq(struct sk_buff *skb)
1575 if (atomic_dec_and_test(&skb->users)) {
1576 struct softnet_data *sd;
1577 unsigned long flags;
1579 local_irq_save(flags);
1580 sd = &__get_cpu_var(softnet_data);
1581 skb->next = sd->completion_queue;
1582 sd->completion_queue = skb;
1583 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1584 local_irq_restore(flags);
1587 EXPORT_SYMBOL(dev_kfree_skb_irq);
1589 void dev_kfree_skb_any(struct sk_buff *skb)
1591 if (in_irq() || irqs_disabled())
1592 dev_kfree_skb_irq(skb);
1596 EXPORT_SYMBOL(dev_kfree_skb_any);
1600 * netif_device_detach - mark device as removed
1601 * @dev: network device
1603 * Mark device as removed from system and therefore no longer available.
1605 void netif_device_detach(struct net_device *dev)
1607 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1608 netif_running(dev)) {
1609 netif_tx_stop_all_queues(dev);
1612 EXPORT_SYMBOL(netif_device_detach);
1615 * netif_device_attach - mark device as attached
1616 * @dev: network device
1618 * Mark device as attached from system and restart if needed.
1620 void netif_device_attach(struct net_device *dev)
1622 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1623 netif_running(dev)) {
1624 netif_tx_wake_all_queues(dev);
1625 __netdev_watchdog_up(dev);
1628 EXPORT_SYMBOL(netif_device_attach);
1630 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1632 return ((features & NETIF_F_GEN_CSUM) ||
1633 ((features & NETIF_F_IP_CSUM) &&
1634 protocol == htons(ETH_P_IP)) ||
1635 ((features & NETIF_F_IPV6_CSUM) &&
1636 protocol == htons(ETH_P_IPV6)) ||
1637 ((features & NETIF_F_FCOE_CRC) &&
1638 protocol == htons(ETH_P_FCOE)));
1641 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1643 if (can_checksum_protocol(dev->features, skb->protocol))
1646 if (skb->protocol == htons(ETH_P_8021Q)) {
1647 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1648 if (can_checksum_protocol(dev->features & dev->vlan_features,
1649 veh->h_vlan_encapsulated_proto))
1657 * skb_dev_set -- assign a new device to a buffer
1658 * @skb: buffer for the new device
1659 * @dev: network device
1661 * If an skb is owned by a device already, we have to reset
1662 * all data private to the namespace a device belongs to
1663 * before assigning it a new device.
1665 #ifdef CONFIG_NET_NS
1666 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1669 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1672 skb_init_secmark(skb);
1676 skb->ipvs_property = 0;
1677 #ifdef CONFIG_NET_SCHED
1683 EXPORT_SYMBOL(skb_set_dev);
1684 #endif /* CONFIG_NET_NS */
1687 * Invalidate hardware checksum when packet is to be mangled, and
1688 * complete checksum manually on outgoing path.
1690 int skb_checksum_help(struct sk_buff *skb)
1693 int ret = 0, offset;
1695 if (skb->ip_summed == CHECKSUM_COMPLETE)
1696 goto out_set_summed;
1698 if (unlikely(skb_shinfo(skb)->gso_size)) {
1699 /* Let GSO fix up the checksum. */
1700 goto out_set_summed;
1703 offset = skb->csum_start - skb_headroom(skb);
1704 BUG_ON(offset >= skb_headlen(skb));
1705 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1707 offset += skb->csum_offset;
1708 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1710 if (skb_cloned(skb) &&
1711 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1712 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1717 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1719 skb->ip_summed = CHECKSUM_NONE;
1723 EXPORT_SYMBOL(skb_checksum_help);
1726 * skb_gso_segment - Perform segmentation on skb.
1727 * @skb: buffer to segment
1728 * @features: features for the output path (see dev->features)
1730 * This function segments the given skb and returns a list of segments.
1732 * It may return NULL if the skb requires no segmentation. This is
1733 * only possible when GSO is used for verifying header integrity.
1735 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1737 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1738 struct packet_type *ptype;
1739 __be16 type = skb->protocol;
1742 skb_reset_mac_header(skb);
1743 skb->mac_len = skb->network_header - skb->mac_header;
1744 __skb_pull(skb, skb->mac_len);
1746 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1747 struct net_device *dev = skb->dev;
1748 struct ethtool_drvinfo info = {};
1750 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1751 dev->ethtool_ops->get_drvinfo(dev, &info);
1753 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1755 info.driver, dev ? dev->features : 0L,
1756 skb->sk ? skb->sk->sk_route_caps : 0L,
1757 skb->len, skb->data_len, skb->ip_summed);
1759 if (skb_header_cloned(skb) &&
1760 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1761 return ERR_PTR(err);
1765 list_for_each_entry_rcu(ptype,
1766 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1767 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1768 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1769 err = ptype->gso_send_check(skb);
1770 segs = ERR_PTR(err);
1771 if (err || skb_gso_ok(skb, features))
1773 __skb_push(skb, (skb->data -
1774 skb_network_header(skb)));
1776 segs = ptype->gso_segment(skb, features);
1782 __skb_push(skb, skb->data - skb_mac_header(skb));
1786 EXPORT_SYMBOL(skb_gso_segment);
1788 /* Take action when hardware reception checksum errors are detected. */
1790 void netdev_rx_csum_fault(struct net_device *dev)
1792 if (net_ratelimit()) {
1793 printk(KERN_ERR "%s: hw csum failure.\n",
1794 dev ? dev->name : "<unknown>");
1798 EXPORT_SYMBOL(netdev_rx_csum_fault);
1801 /* Actually, we should eliminate this check as soon as we know, that:
1802 * 1. IOMMU is present and allows to map all the memory.
1803 * 2. No high memory really exists on this machine.
1806 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1808 #ifdef CONFIG_HIGHMEM
1810 if (!(dev->features & NETIF_F_HIGHDMA)) {
1811 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1812 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1816 if (PCI_DMA_BUS_IS_PHYS) {
1817 struct device *pdev = dev->dev.parent;
1821 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1822 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1823 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1832 void (*destructor)(struct sk_buff *skb);
1835 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1837 static void dev_gso_skb_destructor(struct sk_buff *skb)
1839 struct dev_gso_cb *cb;
1842 struct sk_buff *nskb = skb->next;
1844 skb->next = nskb->next;
1847 } while (skb->next);
1849 cb = DEV_GSO_CB(skb);
1851 cb->destructor(skb);
1855 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1856 * @skb: buffer to segment
1858 * This function segments the given skb and stores the list of segments
1861 static int dev_gso_segment(struct sk_buff *skb)
1863 struct net_device *dev = skb->dev;
1864 struct sk_buff *segs;
1865 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1868 segs = skb_gso_segment(skb, features);
1870 /* Verifying header integrity only. */
1875 return PTR_ERR(segs);
1878 DEV_GSO_CB(skb)->destructor = skb->destructor;
1879 skb->destructor = dev_gso_skb_destructor;
1885 * Try to orphan skb early, right before transmission by the device.
1886 * We cannot orphan skb if tx timestamp is requested, since
1887 * drivers need to call skb_tstamp_tx() to send the timestamp.
1889 static inline void skb_orphan_try(struct sk_buff *skb)
1891 if (!skb_tx(skb)->flags)
1895 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1896 struct netdev_queue *txq)
1898 const struct net_device_ops *ops = dev->netdev_ops;
1899 int rc = NETDEV_TX_OK;
1901 if (likely(!skb->next)) {
1902 if (!list_empty(&ptype_all))
1903 dev_queue_xmit_nit(skb, dev);
1905 if (netif_needs_gso(dev, skb)) {
1906 if (unlikely(dev_gso_segment(skb)))
1913 * If device doesnt need skb->dst, release it right now while
1914 * its hot in this cpu cache
1916 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1919 skb_orphan_try(skb);
1920 rc = ops->ndo_start_xmit(skb, dev);
1921 if (rc == NETDEV_TX_OK)
1922 txq_trans_update(txq);
1928 struct sk_buff *nskb = skb->next;
1930 skb->next = nskb->next;
1934 * If device doesnt need nskb->dst, release it right now while
1935 * its hot in this cpu cache
1937 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1940 skb_orphan_try(nskb);
1941 rc = ops->ndo_start_xmit(nskb, dev);
1942 if (unlikely(rc != NETDEV_TX_OK)) {
1943 if (rc & ~NETDEV_TX_MASK)
1944 goto out_kfree_gso_skb;
1945 nskb->next = skb->next;
1949 txq_trans_update(txq);
1950 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1951 return NETDEV_TX_BUSY;
1952 } while (skb->next);
1955 if (likely(skb->next == NULL))
1956 skb->destructor = DEV_GSO_CB(skb)->destructor;
1962 static u32 hashrnd __read_mostly;
1964 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1968 if (skb_rx_queue_recorded(skb)) {
1969 hash = skb_get_rx_queue(skb);
1970 while (unlikely(hash >= dev->real_num_tx_queues))
1971 hash -= dev->real_num_tx_queues;
1975 if (skb->sk && skb->sk->sk_hash)
1976 hash = skb->sk->sk_hash;
1978 hash = (__force u16) skb->protocol;
1980 hash = jhash_1word(hash, hashrnd);
1982 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1984 EXPORT_SYMBOL(skb_tx_hash);
1986 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
1988 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
1989 if (net_ratelimit()) {
1990 pr_warning("%s selects TX queue %d, but "
1991 "real number of TX queues is %d\n",
1992 dev->name, queue_index, dev->real_num_tx_queues);
1999 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2000 struct sk_buff *skb)
2003 struct sock *sk = skb->sk;
2005 if (sk_tx_queue_recorded(sk)) {
2006 queue_index = sk_tx_queue_get(sk);
2008 const struct net_device_ops *ops = dev->netdev_ops;
2010 if (ops->ndo_select_queue) {
2011 queue_index = ops->ndo_select_queue(dev, skb);
2012 queue_index = dev_cap_txqueue(dev, queue_index);
2015 if (dev->real_num_tx_queues > 1)
2016 queue_index = skb_tx_hash(dev, skb);
2019 struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
2021 if (dst && skb_dst(skb) == dst)
2022 sk_tx_queue_set(sk, queue_index);
2027 skb_set_queue_mapping(skb, queue_index);
2028 return netdev_get_tx_queue(dev, queue_index);
2031 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2032 struct net_device *dev,
2033 struct netdev_queue *txq)
2035 spinlock_t *root_lock = qdisc_lock(q);
2038 spin_lock(root_lock);
2039 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2042 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2043 !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
2045 * This is a work-conserving queue; there are no old skbs
2046 * waiting to be sent out; and the qdisc is not running -
2047 * xmit the skb directly.
2049 __qdisc_update_bstats(q, skb->len);
2050 if (sch_direct_xmit(skb, q, dev, txq, root_lock))
2053 clear_bit(__QDISC_STATE_RUNNING, &q->state);
2055 rc = NET_XMIT_SUCCESS;
2057 rc = qdisc_enqueue_root(skb, q);
2060 spin_unlock(root_lock);
2066 * Returns true if either:
2067 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2068 * 2. skb is fragmented and the device does not support SG, or if
2069 * at least one of fragments is in highmem and device does not
2070 * support DMA from it.
2072 static inline int skb_needs_linearize(struct sk_buff *skb,
2073 struct net_device *dev)
2075 return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
2076 (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
2077 illegal_highdma(dev, skb)));
2081 * dev_queue_xmit - transmit a buffer
2082 * @skb: buffer to transmit
2084 * Queue a buffer for transmission to a network device. The caller must
2085 * have set the device and priority and built the buffer before calling
2086 * this function. The function can be called from an interrupt.
2088 * A negative errno code is returned on a failure. A success does not
2089 * guarantee the frame will be transmitted as it may be dropped due
2090 * to congestion or traffic shaping.
2092 * -----------------------------------------------------------------------------------
2093 * I notice this method can also return errors from the queue disciplines,
2094 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2097 * Regardless of the return value, the skb is consumed, so it is currently
2098 * difficult to retry a send to this method. (You can bump the ref count
2099 * before sending to hold a reference for retry if you are careful.)
2101 * When calling this method, interrupts MUST be enabled. This is because
2102 * the BH enable code must have IRQs enabled so that it will not deadlock.
2105 int dev_queue_xmit(struct sk_buff *skb)
2107 struct net_device *dev = skb->dev;
2108 struct netdev_queue *txq;
2112 /* GSO will handle the following emulations directly. */
2113 if (netif_needs_gso(dev, skb))
2116 /* Convert a paged skb to linear, if required */
2117 if (skb_needs_linearize(skb, dev) && __skb_linearize(skb))
2120 /* If packet is not checksummed and device does not support
2121 * checksumming for this protocol, complete checksumming here.
2123 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2124 skb_set_transport_header(skb, skb->csum_start -
2126 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
2131 /* Disable soft irqs for various locks below. Also
2132 * stops preemption for RCU.
2136 txq = dev_pick_tx(dev, skb);
2137 q = rcu_dereference_bh(txq->qdisc);
2139 #ifdef CONFIG_NET_CLS_ACT
2140 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2143 rc = __dev_xmit_skb(skb, q, dev, txq);
2147 /* The device has no queue. Common case for software devices:
2148 loopback, all the sorts of tunnels...
2150 Really, it is unlikely that netif_tx_lock protection is necessary
2151 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2153 However, it is possible, that they rely on protection
2156 Check this and shot the lock. It is not prone from deadlocks.
2157 Either shot noqueue qdisc, it is even simpler 8)
2159 if (dev->flags & IFF_UP) {
2160 int cpu = smp_processor_id(); /* ok because BHs are off */
2162 if (txq->xmit_lock_owner != cpu) {
2164 HARD_TX_LOCK(dev, txq, cpu);
2166 if (!netif_tx_queue_stopped(txq)) {
2167 rc = dev_hard_start_xmit(skb, dev, txq);
2168 if (dev_xmit_complete(rc)) {
2169 HARD_TX_UNLOCK(dev, txq);
2173 HARD_TX_UNLOCK(dev, txq);
2174 if (net_ratelimit())
2175 printk(KERN_CRIT "Virtual device %s asks to "
2176 "queue packet!\n", dev->name);
2178 /* Recursion is detected! It is possible,
2180 if (net_ratelimit())
2181 printk(KERN_CRIT "Dead loop on virtual device "
2182 "%s, fix it urgently!\n", dev->name);
2187 rcu_read_unlock_bh();
2193 rcu_read_unlock_bh();
2196 EXPORT_SYMBOL(dev_queue_xmit);
2199 /*=======================================================================
2201 =======================================================================*/
2203 int netdev_max_backlog __read_mostly = 1000;
2204 int netdev_budget __read_mostly = 300;
2205 int weight_p __read_mostly = 64; /* old backlog weight */
2207 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
2211 /* One global table that all flow-based protocols share. */
2212 struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
2213 EXPORT_SYMBOL(rps_sock_flow_table);
2216 * get_rps_cpu is called from netif_receive_skb and returns the target
2217 * CPU from the RPS map of the receiving queue for a given skb.
2218 * rcu_read_lock must be held on entry.
2220 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2221 struct rps_dev_flow **rflowp)
2223 struct ipv6hdr *ip6;
2225 struct netdev_rx_queue *rxqueue;
2226 struct rps_map *map;
2227 struct rps_dev_flow_table *flow_table;
2228 struct rps_sock_flow_table *sock_flow_table;
2232 u32 addr1, addr2, ports, ihl;
2234 if (skb_rx_queue_recorded(skb)) {
2235 u16 index = skb_get_rx_queue(skb);
2236 if (unlikely(index >= dev->num_rx_queues)) {
2237 if (net_ratelimit()) {
2238 pr_warning("%s received packet on queue "
2239 "%u, but number of RX queues is %u\n",
2240 dev->name, index, dev->num_rx_queues);
2244 rxqueue = dev->_rx + index;
2248 if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
2252 goto got_hash; /* Skip hash computation on packet header */
2254 switch (skb->protocol) {
2255 case __constant_htons(ETH_P_IP):
2256 if (!pskb_may_pull(skb, sizeof(*ip)))
2259 ip = (struct iphdr *) skb->data;
2260 ip_proto = ip->protocol;
2261 addr1 = (__force u32) ip->saddr;
2262 addr2 = (__force u32) ip->daddr;
2265 case __constant_htons(ETH_P_IPV6):
2266 if (!pskb_may_pull(skb, sizeof(*ip6)))
2269 ip6 = (struct ipv6hdr *) skb->data;
2270 ip_proto = ip6->nexthdr;
2271 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2272 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2286 case IPPROTO_UDPLITE:
2287 if (pskb_may_pull(skb, (ihl * 4) + 4)) {
2288 __be16 *hports = (__be16 *) (skb->data + (ihl * 4));
2291 sport = (__force u16) hports[0];
2292 dport = (__force u16) hports[1];
2295 ports = (sport << 16) + dport;
2303 /* get a consistent hash (same value on both flow directions) */
2306 skb->rxhash = jhash_3words(addr1, addr2, ports, hashrnd);
2311 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2312 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2313 if (flow_table && sock_flow_table) {
2315 struct rps_dev_flow *rflow;
2317 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2320 next_cpu = sock_flow_table->ents[skb->rxhash &
2321 sock_flow_table->mask];
2324 * If the desired CPU (where last recvmsg was done) is
2325 * different from current CPU (one in the rx-queue flow
2326 * table entry), switch if one of the following holds:
2327 * - Current CPU is unset (equal to RPS_NO_CPU).
2328 * - Current CPU is offline.
2329 * - The current CPU's queue tail has advanced beyond the
2330 * last packet that was enqueued using this table entry.
2331 * This guarantees that all previous packets for the flow
2332 * have been dequeued, thus preserving in order delivery.
2334 if (unlikely(tcpu != next_cpu) &&
2335 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2336 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2337 rflow->last_qtail)) >= 0)) {
2338 tcpu = rflow->cpu = next_cpu;
2339 if (tcpu != RPS_NO_CPU)
2340 rflow->last_qtail = per_cpu(softnet_data,
2341 tcpu).input_queue_head;
2343 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2350 map = rcu_dereference(rxqueue->rps_map);
2352 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2354 if (cpu_online(tcpu)) {
2364 /* Called from hardirq (IPI) context */
2365 static void rps_trigger_softirq(void *data)
2367 struct softnet_data *sd = data;
2369 __napi_schedule(&sd->backlog);
2370 __get_cpu_var(netdev_rx_stat).received_rps++;
2373 #endif /* CONFIG_RPS */
2376 * Check if this softnet_data structure is another cpu one
2377 * If yes, queue it to our IPI list and return 1
2380 static int rps_ipi_queued(struct softnet_data *sd)
2383 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2386 sd->rps_ipi_next = mysd->rps_ipi_list;
2387 mysd->rps_ipi_list = sd;
2389 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2392 #endif /* CONFIG_RPS */
2397 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2398 * queue (may be a remote CPU queue).
2400 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2401 unsigned int *qtail)
2403 struct softnet_data *sd;
2404 unsigned long flags;
2406 sd = &per_cpu(softnet_data, cpu);
2408 local_irq_save(flags);
2409 __get_cpu_var(netdev_rx_stat).total++;
2412 if (sd->input_pkt_queue.qlen <= netdev_max_backlog) {
2413 if (sd->input_pkt_queue.qlen) {
2415 __skb_queue_tail(&sd->input_pkt_queue, skb);
2417 *qtail = sd->input_queue_head + sd->input_pkt_queue.qlen;
2420 local_irq_restore(flags);
2421 return NET_RX_SUCCESS;
2424 /* Schedule NAPI for backlog device */
2425 if (napi_schedule_prep(&sd->backlog)) {
2426 if (!rps_ipi_queued(sd))
2427 __napi_schedule(&sd->backlog);
2434 __get_cpu_var(netdev_rx_stat).dropped++;
2435 local_irq_restore(flags);
2442 * netif_rx - post buffer to the network code
2443 * @skb: buffer to post
2445 * This function receives a packet from a device driver and queues it for
2446 * the upper (protocol) levels to process. It always succeeds. The buffer
2447 * may be dropped during processing for congestion control or by the
2451 * NET_RX_SUCCESS (no congestion)
2452 * NET_RX_DROP (packet was dropped)
2456 int netif_rx(struct sk_buff *skb)
2460 /* if netpoll wants it, pretend we never saw it */
2461 if (netpoll_rx(skb))
2464 if (!skb->tstamp.tv64)
2469 struct rps_dev_flow voidflow, *rflow = &voidflow;
2474 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2476 cpu = smp_processor_id();
2478 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2485 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2491 EXPORT_SYMBOL(netif_rx);
2493 int netif_rx_ni(struct sk_buff *skb)
2498 err = netif_rx(skb);
2499 if (local_softirq_pending())
2505 EXPORT_SYMBOL(netif_rx_ni);
2507 static void net_tx_action(struct softirq_action *h)
2509 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2511 if (sd->completion_queue) {
2512 struct sk_buff *clist;
2514 local_irq_disable();
2515 clist = sd->completion_queue;
2516 sd->completion_queue = NULL;
2520 struct sk_buff *skb = clist;
2521 clist = clist->next;
2523 WARN_ON(atomic_read(&skb->users));
2528 if (sd->output_queue) {
2531 local_irq_disable();
2532 head = sd->output_queue;
2533 sd->output_queue = NULL;
2537 struct Qdisc *q = head;
2538 spinlock_t *root_lock;
2540 head = head->next_sched;
2542 root_lock = qdisc_lock(q);
2543 if (spin_trylock(root_lock)) {
2544 smp_mb__before_clear_bit();
2545 clear_bit(__QDISC_STATE_SCHED,
2548 spin_unlock(root_lock);
2550 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2552 __netif_reschedule(q);
2554 smp_mb__before_clear_bit();
2555 clear_bit(__QDISC_STATE_SCHED,
2563 static inline int deliver_skb(struct sk_buff *skb,
2564 struct packet_type *pt_prev,
2565 struct net_device *orig_dev)
2567 atomic_inc(&skb->users);
2568 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2571 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2573 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
2574 /* This hook is defined here for ATM LANE */
2575 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2576 unsigned char *addr) __read_mostly;
2577 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2581 * If bridge module is loaded call bridging hook.
2582 * returns NULL if packet was consumed.
2584 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2585 struct sk_buff *skb) __read_mostly;
2586 EXPORT_SYMBOL_GPL(br_handle_frame_hook);
2588 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2589 struct packet_type **pt_prev, int *ret,
2590 struct net_device *orig_dev)
2592 struct net_bridge_port *port;
2594 if (skb->pkt_type == PACKET_LOOPBACK ||
2595 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2599 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2603 return br_handle_frame_hook(port, skb);
2606 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2609 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2610 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2611 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2613 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2614 struct packet_type **pt_prev,
2616 struct net_device *orig_dev)
2618 if (skb->dev->macvlan_port == NULL)
2622 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2625 return macvlan_handle_frame_hook(skb);
2628 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2631 #ifdef CONFIG_NET_CLS_ACT
2632 /* TODO: Maybe we should just force sch_ingress to be compiled in
2633 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2634 * a compare and 2 stores extra right now if we dont have it on
2635 * but have CONFIG_NET_CLS_ACT
2636 * NOTE: This doesnt stop any functionality; if you dont have
2637 * the ingress scheduler, you just cant add policies on ingress.
2640 static int ing_filter(struct sk_buff *skb)
2642 struct net_device *dev = skb->dev;
2643 u32 ttl = G_TC_RTTL(skb->tc_verd);
2644 struct netdev_queue *rxq;
2645 int result = TC_ACT_OK;
2648 if (MAX_RED_LOOP < ttl++) {
2650 "Redir loop detected Dropping packet (%d->%d)\n",
2651 skb->skb_iif, dev->ifindex);
2655 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2656 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2658 rxq = &dev->rx_queue;
2661 if (q != &noop_qdisc) {
2662 spin_lock(qdisc_lock(q));
2663 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2664 result = qdisc_enqueue_root(skb, q);
2665 spin_unlock(qdisc_lock(q));
2671 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2672 struct packet_type **pt_prev,
2673 int *ret, struct net_device *orig_dev)
2675 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2679 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2682 /* Huh? Why does turning on AF_PACKET affect this? */
2683 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2686 switch (ing_filter(skb)) {
2700 * netif_nit_deliver - deliver received packets to network taps
2703 * This function is used to deliver incoming packets to network
2704 * taps. It should be used when the normal netif_receive_skb path
2705 * is bypassed, for example because of VLAN acceleration.
2707 void netif_nit_deliver(struct sk_buff *skb)
2709 struct packet_type *ptype;
2711 if (list_empty(&ptype_all))
2714 skb_reset_network_header(skb);
2715 skb_reset_transport_header(skb);
2716 skb->mac_len = skb->network_header - skb->mac_header;
2719 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2720 if (!ptype->dev || ptype->dev == skb->dev)
2721 deliver_skb(skb, ptype, skb->dev);
2726 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2727 struct net_device *master)
2729 if (skb->pkt_type == PACKET_HOST) {
2730 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2732 memcpy(dest, master->dev_addr, ETH_ALEN);
2736 /* On bonding slaves other than the currently active slave, suppress
2737 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2738 * ARP on active-backup slaves with arp_validate enabled.
2740 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2742 struct net_device *dev = skb->dev;
2744 if (master->priv_flags & IFF_MASTER_ARPMON)
2745 dev->last_rx = jiffies;
2747 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
2748 /* Do address unmangle. The local destination address
2749 * will be always the one master has. Provides the right
2750 * functionality in a bridge.
2752 skb_bond_set_mac_by_master(skb, master);
2755 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2756 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2757 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2760 if (master->priv_flags & IFF_MASTER_ALB) {
2761 if (skb->pkt_type != PACKET_BROADCAST &&
2762 skb->pkt_type != PACKET_MULTICAST)
2765 if (master->priv_flags & IFF_MASTER_8023AD &&
2766 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2773 EXPORT_SYMBOL(__skb_bond_should_drop);
2775 static int __netif_receive_skb(struct sk_buff *skb)
2777 struct packet_type *ptype, *pt_prev;
2778 struct net_device *orig_dev;
2779 struct net_device *master;
2780 struct net_device *null_or_orig;
2781 struct net_device *null_or_bond;
2782 int ret = NET_RX_DROP;
2785 if (!skb->tstamp.tv64)
2788 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2789 return NET_RX_SUCCESS;
2791 /* if we've gotten here through NAPI, check netpoll */
2792 if (netpoll_receive_skb(skb))
2796 skb->skb_iif = skb->dev->ifindex;
2798 null_or_orig = NULL;
2799 orig_dev = skb->dev;
2800 master = ACCESS_ONCE(orig_dev->master);
2802 if (skb_bond_should_drop(skb, master))
2803 null_or_orig = orig_dev; /* deliver only exact match */
2808 __get_cpu_var(netdev_rx_stat).total++;
2810 skb_reset_network_header(skb);
2811 skb_reset_transport_header(skb);
2812 skb->mac_len = skb->network_header - skb->mac_header;
2818 #ifdef CONFIG_NET_CLS_ACT
2819 if (skb->tc_verd & TC_NCLS) {
2820 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2825 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2826 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2827 ptype->dev == orig_dev) {
2829 ret = deliver_skb(skb, pt_prev, orig_dev);
2834 #ifdef CONFIG_NET_CLS_ACT
2835 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2841 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2844 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2849 * Make sure frames received on VLAN interfaces stacked on
2850 * bonding interfaces still make their way to any base bonding
2851 * device that may have registered for a specific ptype. The
2852 * handler may have to adjust skb->dev and orig_dev.
2854 null_or_bond = NULL;
2855 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2856 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2857 null_or_bond = vlan_dev_real_dev(skb->dev);
2860 type = skb->protocol;
2861 list_for_each_entry_rcu(ptype,
2862 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2863 if (ptype->type == type && (ptype->dev == null_or_orig ||
2864 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2865 ptype->dev == null_or_bond)) {
2867 ret = deliver_skb(skb, pt_prev, orig_dev);
2873 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2876 /* Jamal, now you will not able to escape explaining
2877 * me how you were going to use this. :-)
2888 * netif_receive_skb - process receive buffer from network
2889 * @skb: buffer to process
2891 * netif_receive_skb() is the main receive data processing function.
2892 * It always succeeds. The buffer may be dropped during processing
2893 * for congestion control or by the protocol layers.
2895 * This function may only be called from softirq context and interrupts
2896 * should be enabled.
2898 * Return values (usually ignored):
2899 * NET_RX_SUCCESS: no congestion
2900 * NET_RX_DROP: packet was dropped
2902 int netif_receive_skb(struct sk_buff *skb)
2905 struct rps_dev_flow voidflow, *rflow = &voidflow;
2910 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2913 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2917 ret = __netif_receive_skb(skb);
2922 return __netif_receive_skb(skb);
2925 EXPORT_SYMBOL(netif_receive_skb);
2927 /* Network device is going away, flush any packets still pending
2928 * Called with irqs disabled.
2930 static void flush_backlog(void *arg)
2932 struct net_device *dev = arg;
2933 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2934 struct sk_buff *skb, *tmp;
2937 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp)
2938 if (skb->dev == dev) {
2939 __skb_unlink(skb, &sd->input_pkt_queue);
2941 input_queue_head_incr(sd);
2946 static int napi_gro_complete(struct sk_buff *skb)
2948 struct packet_type *ptype;
2949 __be16 type = skb->protocol;
2950 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2953 if (NAPI_GRO_CB(skb)->count == 1) {
2954 skb_shinfo(skb)->gso_size = 0;
2959 list_for_each_entry_rcu(ptype, head, list) {
2960 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2963 err = ptype->gro_complete(skb);
2969 WARN_ON(&ptype->list == head);
2971 return NET_RX_SUCCESS;
2975 return netif_receive_skb(skb);
2978 static void napi_gro_flush(struct napi_struct *napi)
2980 struct sk_buff *skb, *next;
2982 for (skb = napi->gro_list; skb; skb = next) {
2985 napi_gro_complete(skb);
2988 napi->gro_count = 0;
2989 napi->gro_list = NULL;
2992 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2994 struct sk_buff **pp = NULL;
2995 struct packet_type *ptype;
2996 __be16 type = skb->protocol;
2997 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3000 enum gro_result ret;
3002 if (!(skb->dev->features & NETIF_F_GRO))
3005 if (skb_is_gso(skb) || skb_has_frags(skb))
3009 list_for_each_entry_rcu(ptype, head, list) {
3010 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3013 skb_set_network_header(skb, skb_gro_offset(skb));
3014 mac_len = skb->network_header - skb->mac_header;
3015 skb->mac_len = mac_len;
3016 NAPI_GRO_CB(skb)->same_flow = 0;
3017 NAPI_GRO_CB(skb)->flush = 0;
3018 NAPI_GRO_CB(skb)->free = 0;
3020 pp = ptype->gro_receive(&napi->gro_list, skb);
3025 if (&ptype->list == head)
3028 same_flow = NAPI_GRO_CB(skb)->same_flow;
3029 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3032 struct sk_buff *nskb = *pp;
3036 napi_gro_complete(nskb);
3043 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3047 NAPI_GRO_CB(skb)->count = 1;
3048 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3049 skb->next = napi->gro_list;
3050 napi->gro_list = skb;
3054 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3055 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3057 BUG_ON(skb->end - skb->tail < grow);
3059 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3062 skb->data_len -= grow;
3064 skb_shinfo(skb)->frags[0].page_offset += grow;
3065 skb_shinfo(skb)->frags[0].size -= grow;
3067 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3068 put_page(skb_shinfo(skb)->frags[0].page);
3069 memmove(skb_shinfo(skb)->frags,
3070 skb_shinfo(skb)->frags + 1,
3071 --skb_shinfo(skb)->nr_frags);
3082 EXPORT_SYMBOL(dev_gro_receive);
3085 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3089 if (netpoll_rx_on(skb))
3092 for (p = napi->gro_list; p; p = p->next) {
3093 NAPI_GRO_CB(p)->same_flow =
3094 (p->dev == skb->dev) &&
3095 !compare_ether_header(skb_mac_header(p),
3096 skb_gro_mac_header(skb));
3097 NAPI_GRO_CB(p)->flush = 0;
3100 return dev_gro_receive(napi, skb);
3103 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3107 if (netif_receive_skb(skb))
3112 case GRO_MERGED_FREE:
3123 EXPORT_SYMBOL(napi_skb_finish);
3125 void skb_gro_reset_offset(struct sk_buff *skb)
3127 NAPI_GRO_CB(skb)->data_offset = 0;
3128 NAPI_GRO_CB(skb)->frag0 = NULL;
3129 NAPI_GRO_CB(skb)->frag0_len = 0;
3131 if (skb->mac_header == skb->tail &&
3132 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3133 NAPI_GRO_CB(skb)->frag0 =
3134 page_address(skb_shinfo(skb)->frags[0].page) +
3135 skb_shinfo(skb)->frags[0].page_offset;
3136 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3139 EXPORT_SYMBOL(skb_gro_reset_offset);
3141 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3143 skb_gro_reset_offset(skb);
3145 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3147 EXPORT_SYMBOL(napi_gro_receive);
3149 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3151 __skb_pull(skb, skb_headlen(skb));
3152 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3156 EXPORT_SYMBOL(napi_reuse_skb);
3158 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3160 struct sk_buff *skb = napi->skb;
3163 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3169 EXPORT_SYMBOL(napi_get_frags);
3171 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3177 skb->protocol = eth_type_trans(skb, skb->dev);
3179 if (ret == GRO_HELD)
3180 skb_gro_pull(skb, -ETH_HLEN);
3181 else if (netif_receive_skb(skb))
3186 case GRO_MERGED_FREE:
3187 napi_reuse_skb(napi, skb);
3196 EXPORT_SYMBOL(napi_frags_finish);
3198 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3200 struct sk_buff *skb = napi->skb;
3207 skb_reset_mac_header(skb);
3208 skb_gro_reset_offset(skb);
3210 off = skb_gro_offset(skb);
3211 hlen = off + sizeof(*eth);
3212 eth = skb_gro_header_fast(skb, off);
3213 if (skb_gro_header_hard(skb, hlen)) {
3214 eth = skb_gro_header_slow(skb, hlen, off);
3215 if (unlikely(!eth)) {
3216 napi_reuse_skb(napi, skb);
3222 skb_gro_pull(skb, sizeof(*eth));
3225 * This works because the only protocols we care about don't require
3226 * special handling. We'll fix it up properly at the end.
3228 skb->protocol = eth->h_proto;
3233 EXPORT_SYMBOL(napi_frags_skb);
3235 gro_result_t napi_gro_frags(struct napi_struct *napi)
3237 struct sk_buff *skb = napi_frags_skb(napi);
3242 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3244 EXPORT_SYMBOL(napi_gro_frags);
3246 static int process_backlog(struct napi_struct *napi, int quota)
3249 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3251 napi->weight = weight_p;
3253 struct sk_buff *skb;
3255 local_irq_disable();
3257 skb = __skb_dequeue(&sd->input_pkt_queue);
3259 __napi_complete(napi);
3264 input_queue_head_incr(sd);
3268 __netif_receive_skb(skb);
3269 } while (++work < quota);
3275 * __napi_schedule - schedule for receive
3276 * @n: entry to schedule
3278 * The entry's receive function will be scheduled to run
3280 void __napi_schedule(struct napi_struct *n)
3282 unsigned long flags;
3284 local_irq_save(flags);
3285 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
3286 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3287 local_irq_restore(flags);
3289 EXPORT_SYMBOL(__napi_schedule);
3291 void __napi_complete(struct napi_struct *n)
3293 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3294 BUG_ON(n->gro_list);
3296 list_del(&n->poll_list);
3297 smp_mb__before_clear_bit();
3298 clear_bit(NAPI_STATE_SCHED, &n->state);
3300 EXPORT_SYMBOL(__napi_complete);
3302 void napi_complete(struct napi_struct *n)
3304 unsigned long flags;
3307 * don't let napi dequeue from the cpu poll list
3308 * just in case its running on a different cpu
3310 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3314 local_irq_save(flags);
3316 local_irq_restore(flags);
3318 EXPORT_SYMBOL(napi_complete);
3320 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3321 int (*poll)(struct napi_struct *, int), int weight)
3323 INIT_LIST_HEAD(&napi->poll_list);
3324 napi->gro_count = 0;
3325 napi->gro_list = NULL;
3328 napi->weight = weight;
3329 list_add(&napi->dev_list, &dev->napi_list);
3331 #ifdef CONFIG_NETPOLL
3332 spin_lock_init(&napi->poll_lock);
3333 napi->poll_owner = -1;
3335 set_bit(NAPI_STATE_SCHED, &napi->state);
3337 EXPORT_SYMBOL(netif_napi_add);
3339 void netif_napi_del(struct napi_struct *napi)
3341 struct sk_buff *skb, *next;
3343 list_del_init(&napi->dev_list);
3344 napi_free_frags(napi);
3346 for (skb = napi->gro_list; skb; skb = next) {
3352 napi->gro_list = NULL;
3353 napi->gro_count = 0;
3355 EXPORT_SYMBOL(netif_napi_del);
3358 * net_rps_action sends any pending IPI's for rps.
3359 * Note: called with local irq disabled, but exits with local irq enabled.
3361 static void net_rps_action_and_irq_disable(void)
3364 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3365 struct softnet_data *remsd = sd->rps_ipi_list;
3368 sd->rps_ipi_list = NULL;
3372 /* Send pending IPI's to kick RPS processing on remote cpus. */
3374 struct softnet_data *next = remsd->rps_ipi_next;
3376 if (cpu_online(remsd->cpu))
3377 __smp_call_function_single(remsd->cpu,
3386 static void net_rx_action(struct softirq_action *h)
3388 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
3389 unsigned long time_limit = jiffies + 2;
3390 int budget = netdev_budget;
3393 local_irq_disable();
3395 while (!list_empty(list)) {
3396 struct napi_struct *n;
3399 /* If softirq window is exhuasted then punt.
3400 * Allow this to run for 2 jiffies since which will allow
3401 * an average latency of 1.5/HZ.
3403 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3408 /* Even though interrupts have been re-enabled, this
3409 * access is safe because interrupts can only add new
3410 * entries to the tail of this list, and only ->poll()
3411 * calls can remove this head entry from the list.
3413 n = list_first_entry(list, struct napi_struct, poll_list);
3415 have = netpoll_poll_lock(n);
3419 /* This NAPI_STATE_SCHED test is for avoiding a race
3420 * with netpoll's poll_napi(). Only the entity which
3421 * obtains the lock and sees NAPI_STATE_SCHED set will
3422 * actually make the ->poll() call. Therefore we avoid
3423 * accidently calling ->poll() when NAPI is not scheduled.
3426 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3427 work = n->poll(n, weight);
3431 WARN_ON_ONCE(work > weight);
3435 local_irq_disable();
3437 /* Drivers must not modify the NAPI state if they
3438 * consume the entire weight. In such cases this code
3439 * still "owns" the NAPI instance and therefore can
3440 * move the instance around on the list at-will.
3442 if (unlikely(work == weight)) {
3443 if (unlikely(napi_disable_pending(n))) {
3446 local_irq_disable();
3448 list_move_tail(&n->poll_list, list);
3451 netpoll_poll_unlock(have);
3454 net_rps_action_and_irq_disable();
3456 #ifdef CONFIG_NET_DMA
3458 * There may not be any more sk_buffs coming right now, so push
3459 * any pending DMA copies to hardware
3461 dma_issue_pending_all();
3467 __get_cpu_var(netdev_rx_stat).time_squeeze++;
3468 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3472 static gifconf_func_t *gifconf_list[NPROTO];
3475 * register_gifconf - register a SIOCGIF handler
3476 * @family: Address family
3477 * @gifconf: Function handler
3479 * Register protocol dependent address dumping routines. The handler
3480 * that is passed must not be freed or reused until it has been replaced
3481 * by another handler.
3483 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3485 if (family >= NPROTO)
3487 gifconf_list[family] = gifconf;
3490 EXPORT_SYMBOL(register_gifconf);
3494 * Map an interface index to its name (SIOCGIFNAME)
3498 * We need this ioctl for efficient implementation of the
3499 * if_indextoname() function required by the IPv6 API. Without
3500 * it, we would have to search all the interfaces to find a
3504 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3506 struct net_device *dev;
3510 * Fetch the caller's info block.
3513 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3517 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3523 strcpy(ifr.ifr_name, dev->name);
3526 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3532 * Perform a SIOCGIFCONF call. This structure will change
3533 * size eventually, and there is nothing I can do about it.
3534 * Thus we will need a 'compatibility mode'.
3537 static int dev_ifconf(struct net *net, char __user *arg)
3540 struct net_device *dev;
3547 * Fetch the caller's info block.
3550 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3557 * Loop over the interfaces, and write an info block for each.
3561 for_each_netdev(net, dev) {
3562 for (i = 0; i < NPROTO; i++) {
3563 if (gifconf_list[i]) {
3566 done = gifconf_list[i](dev, NULL, 0);
3568 done = gifconf_list[i](dev, pos + total,
3578 * All done. Write the updated control block back to the caller.
3580 ifc.ifc_len = total;
3583 * Both BSD and Solaris return 0 here, so we do too.
3585 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3588 #ifdef CONFIG_PROC_FS
3590 * This is invoked by the /proc filesystem handler to display a device
3593 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3596 struct net *net = seq_file_net(seq);
3598 struct net_device *dev;
3602 return SEQ_START_TOKEN;
3605 for_each_netdev_rcu(net, dev)
3612 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3614 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3615 first_net_device(seq_file_net(seq)) :
3616 next_net_device((struct net_device *)v);
3619 return rcu_dereference(dev);
3622 void dev_seq_stop(struct seq_file *seq, void *v)
3628 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3630 const struct net_device_stats *stats = dev_get_stats(dev);
3632 seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3633 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3634 dev->name, stats->rx_bytes, stats->rx_packets,
3636 stats->rx_dropped + stats->rx_missed_errors,
3637 stats->rx_fifo_errors,
3638 stats->rx_length_errors + stats->rx_over_errors +
3639 stats->rx_crc_errors + stats->rx_frame_errors,
3640 stats->rx_compressed, stats->multicast,
3641 stats->tx_bytes, stats->tx_packets,
3642 stats->tx_errors, stats->tx_dropped,
3643 stats->tx_fifo_errors, stats->collisions,
3644 stats->tx_carrier_errors +
3645 stats->tx_aborted_errors +
3646 stats->tx_window_errors +
3647 stats->tx_heartbeat_errors,
3648 stats->tx_compressed);
3652 * Called from the PROCfs module. This now uses the new arbitrary sized
3653 * /proc/net interface to create /proc/net/dev
3655 static int dev_seq_show(struct seq_file *seq, void *v)
3657 if (v == SEQ_START_TOKEN)
3658 seq_puts(seq, "Inter-| Receive "
3660 " face |bytes packets errs drop fifo frame "
3661 "compressed multicast|bytes packets errs "
3662 "drop fifo colls carrier compressed\n");
3664 dev_seq_printf_stats(seq, v);
3668 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
3670 struct netif_rx_stats *rc = NULL;
3672 while (*pos < nr_cpu_ids)
3673 if (cpu_online(*pos)) {
3674 rc = &per_cpu(netdev_rx_stat, *pos);
3681 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3683 return softnet_get_online(pos);
3686 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3689 return softnet_get_online(pos);
3692 static void softnet_seq_stop(struct seq_file *seq, void *v)
3696 static int softnet_seq_show(struct seq_file *seq, void *v)
3698 struct netif_rx_stats *s = v;
3700 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3701 s->total, s->dropped, s->time_squeeze, 0,
3702 0, 0, 0, 0, /* was fastroute */
3703 s->cpu_collision, s->received_rps);
3707 static const struct seq_operations dev_seq_ops = {
3708 .start = dev_seq_start,
3709 .next = dev_seq_next,
3710 .stop = dev_seq_stop,
3711 .show = dev_seq_show,
3714 static int dev_seq_open(struct inode *inode, struct file *file)
3716 return seq_open_net(inode, file, &dev_seq_ops,
3717 sizeof(struct seq_net_private));
3720 static const struct file_operations dev_seq_fops = {
3721 .owner = THIS_MODULE,
3722 .open = dev_seq_open,
3724 .llseek = seq_lseek,
3725 .release = seq_release_net,
3728 static const struct seq_operations softnet_seq_ops = {
3729 .start = softnet_seq_start,
3730 .next = softnet_seq_next,
3731 .stop = softnet_seq_stop,
3732 .show = softnet_seq_show,
3735 static int softnet_seq_open(struct inode *inode, struct file *file)
3737 return seq_open(file, &softnet_seq_ops);
3740 static const struct file_operations softnet_seq_fops = {
3741 .owner = THIS_MODULE,
3742 .open = softnet_seq_open,
3744 .llseek = seq_lseek,
3745 .release = seq_release,
3748 static void *ptype_get_idx(loff_t pos)
3750 struct packet_type *pt = NULL;
3754 list_for_each_entry_rcu(pt, &ptype_all, list) {
3760 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3761 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3770 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3774 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3777 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3779 struct packet_type *pt;
3780 struct list_head *nxt;
3784 if (v == SEQ_START_TOKEN)
3785 return ptype_get_idx(0);
3788 nxt = pt->list.next;
3789 if (pt->type == htons(ETH_P_ALL)) {
3790 if (nxt != &ptype_all)
3793 nxt = ptype_base[0].next;
3795 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3797 while (nxt == &ptype_base[hash]) {
3798 if (++hash >= PTYPE_HASH_SIZE)
3800 nxt = ptype_base[hash].next;
3803 return list_entry(nxt, struct packet_type, list);
3806 static void ptype_seq_stop(struct seq_file *seq, void *v)
3812 static int ptype_seq_show(struct seq_file *seq, void *v)
3814 struct packet_type *pt = v;
3816 if (v == SEQ_START_TOKEN)
3817 seq_puts(seq, "Type Device Function\n");
3818 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3819 if (pt->type == htons(ETH_P_ALL))
3820 seq_puts(seq, "ALL ");
3822 seq_printf(seq, "%04x", ntohs(pt->type));
3824 seq_printf(seq, " %-8s %pF\n",
3825 pt->dev ? pt->dev->name : "", pt->func);
3831 static const struct seq_operations ptype_seq_ops = {
3832 .start = ptype_seq_start,
3833 .next = ptype_seq_next,
3834 .stop = ptype_seq_stop,
3835 .show = ptype_seq_show,
3838 static int ptype_seq_open(struct inode *inode, struct file *file)
3840 return seq_open_net(inode, file, &ptype_seq_ops,
3841 sizeof(struct seq_net_private));
3844 static const struct file_operations ptype_seq_fops = {
3845 .owner = THIS_MODULE,
3846 .open = ptype_seq_open,
3848 .llseek = seq_lseek,
3849 .release = seq_release_net,
3853 static int __net_init dev_proc_net_init(struct net *net)
3857 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3859 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3861 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3864 if (wext_proc_init(net))
3870 proc_net_remove(net, "ptype");
3872 proc_net_remove(net, "softnet_stat");
3874 proc_net_remove(net, "dev");
3878 static void __net_exit dev_proc_net_exit(struct net *net)
3880 wext_proc_exit(net);
3882 proc_net_remove(net, "ptype");
3883 proc_net_remove(net, "softnet_stat");
3884 proc_net_remove(net, "dev");
3887 static struct pernet_operations __net_initdata dev_proc_ops = {
3888 .init = dev_proc_net_init,
3889 .exit = dev_proc_net_exit,
3892 static int __init dev_proc_init(void)
3894 return register_pernet_subsys(&dev_proc_ops);
3897 #define dev_proc_init() 0
3898 #endif /* CONFIG_PROC_FS */
3902 * netdev_set_master - set up master/slave pair
3903 * @slave: slave device
3904 * @master: new master device
3906 * Changes the master device of the slave. Pass %NULL to break the
3907 * bonding. The caller must hold the RTNL semaphore. On a failure
3908 * a negative errno code is returned. On success the reference counts
3909 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3910 * function returns zero.
3912 int netdev_set_master(struct net_device *slave, struct net_device *master)
3914 struct net_device *old = slave->master;
3924 slave->master = master;
3931 slave->flags |= IFF_SLAVE;
3933 slave->flags &= ~IFF_SLAVE;
3935 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3938 EXPORT_SYMBOL(netdev_set_master);
3940 static void dev_change_rx_flags(struct net_device *dev, int flags)
3942 const struct net_device_ops *ops = dev->netdev_ops;
3944 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3945 ops->ndo_change_rx_flags(dev, flags);
3948 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3950 unsigned short old_flags = dev->flags;
3956 dev->flags |= IFF_PROMISC;
3957 dev->promiscuity += inc;
3958 if (dev->promiscuity == 0) {
3961 * If inc causes overflow, untouch promisc and return error.
3964 dev->flags &= ~IFF_PROMISC;
3966 dev->promiscuity -= inc;
3967 printk(KERN_WARNING "%s: promiscuity touches roof, "
3968 "set promiscuity failed, promiscuity feature "
3969 "of device might be broken.\n", dev->name);
3973 if (dev->flags != old_flags) {
3974 printk(KERN_INFO "device %s %s promiscuous mode\n",
3975 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3977 if (audit_enabled) {
3978 current_uid_gid(&uid, &gid);
3979 audit_log(current->audit_context, GFP_ATOMIC,
3980 AUDIT_ANOM_PROMISCUOUS,
3981 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3982 dev->name, (dev->flags & IFF_PROMISC),
3983 (old_flags & IFF_PROMISC),
3984 audit_get_loginuid(current),
3986 audit_get_sessionid(current));
3989 dev_change_rx_flags(dev, IFF_PROMISC);
3995 * dev_set_promiscuity - update promiscuity count on a device
3999 * Add or remove promiscuity from a device. While the count in the device
4000 * remains above zero the interface remains promiscuous. Once it hits zero
4001 * the device reverts back to normal filtering operation. A negative inc
4002 * value is used to drop promiscuity on the device.
4003 * Return 0 if successful or a negative errno code on error.
4005 int dev_set_promiscuity(struct net_device *dev, int inc)
4007 unsigned short old_flags = dev->flags;
4010 err = __dev_set_promiscuity(dev, inc);
4013 if (dev->flags != old_flags)
4014 dev_set_rx_mode(dev);
4017 EXPORT_SYMBOL(dev_set_promiscuity);
4020 * dev_set_allmulti - update allmulti count on a device
4024 * Add or remove reception of all multicast frames to a device. While the
4025 * count in the device remains above zero the interface remains listening
4026 * to all interfaces. Once it hits zero the device reverts back to normal
4027 * filtering operation. A negative @inc value is used to drop the counter
4028 * when releasing a resource needing all multicasts.
4029 * Return 0 if successful or a negative errno code on error.
4032 int dev_set_allmulti(struct net_device *dev, int inc)
4034 unsigned short old_flags = dev->flags;
4038 dev->flags |= IFF_ALLMULTI;
4039 dev->allmulti += inc;
4040 if (dev->allmulti == 0) {
4043 * If inc causes overflow, untouch allmulti and return error.
4046 dev->flags &= ~IFF_ALLMULTI;
4048 dev->allmulti -= inc;
4049 printk(KERN_WARNING "%s: allmulti touches roof, "
4050 "set allmulti failed, allmulti feature of "
4051 "device might be broken.\n", dev->name);
4055 if (dev->flags ^ old_flags) {
4056 dev_change_rx_flags(dev, IFF_ALLMULTI);
4057 dev_set_rx_mode(dev);
4061 EXPORT_SYMBOL(dev_set_allmulti);
4064 * Upload unicast and multicast address lists to device and
4065 * configure RX filtering. When the device doesn't support unicast
4066 * filtering it is put in promiscuous mode while unicast addresses
4069 void __dev_set_rx_mode(struct net_device *dev)
4071 const struct net_device_ops *ops = dev->netdev_ops;
4073 /* dev_open will call this function so the list will stay sane. */
4074 if (!(dev->flags&IFF_UP))
4077 if (!netif_device_present(dev))
4080 if (ops->ndo_set_rx_mode)
4081 ops->ndo_set_rx_mode(dev);
4083 /* Unicast addresses changes may only happen under the rtnl,
4084 * therefore calling __dev_set_promiscuity here is safe.
4086 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4087 __dev_set_promiscuity(dev, 1);
4088 dev->uc_promisc = 1;
4089 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4090 __dev_set_promiscuity(dev, -1);
4091 dev->uc_promisc = 0;
4094 if (ops->ndo_set_multicast_list)
4095 ops->ndo_set_multicast_list(dev);
4099 void dev_set_rx_mode(struct net_device *dev)
4101 netif_addr_lock_bh(dev);
4102 __dev_set_rx_mode(dev);
4103 netif_addr_unlock_bh(dev);
4107 * dev_get_flags - get flags reported to userspace
4110 * Get the combination of flag bits exported through APIs to userspace.
4112 unsigned dev_get_flags(const struct net_device *dev)
4116 flags = (dev->flags & ~(IFF_PROMISC |
4121 (dev->gflags & (IFF_PROMISC |
4124 if (netif_running(dev)) {
4125 if (netif_oper_up(dev))
4126 flags |= IFF_RUNNING;
4127 if (netif_carrier_ok(dev))
4128 flags |= IFF_LOWER_UP;
4129 if (netif_dormant(dev))
4130 flags |= IFF_DORMANT;
4135 EXPORT_SYMBOL(dev_get_flags);
4137 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4139 int old_flags = dev->flags;
4145 * Set the flags on our device.
4148 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4149 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4151 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4155 * Load in the correct multicast list now the flags have changed.
4158 if ((old_flags ^ flags) & IFF_MULTICAST)
4159 dev_change_rx_flags(dev, IFF_MULTICAST);
4161 dev_set_rx_mode(dev);
4164 * Have we downed the interface. We handle IFF_UP ourselves
4165 * according to user attempts to set it, rather than blindly
4170 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4171 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4174 dev_set_rx_mode(dev);
4177 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4178 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4180 dev->gflags ^= IFF_PROMISC;
4181 dev_set_promiscuity(dev, inc);
4184 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4185 is important. Some (broken) drivers set IFF_PROMISC, when
4186 IFF_ALLMULTI is requested not asking us and not reporting.
4188 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4189 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4191 dev->gflags ^= IFF_ALLMULTI;
4192 dev_set_allmulti(dev, inc);
4198 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4200 unsigned int changes = dev->flags ^ old_flags;
4202 if (changes & IFF_UP) {
4203 if (dev->flags & IFF_UP)
4204 call_netdevice_notifiers(NETDEV_UP, dev);
4206 call_netdevice_notifiers(NETDEV_DOWN, dev);
4209 if (dev->flags & IFF_UP &&
4210 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4211 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4215 * dev_change_flags - change device settings
4217 * @flags: device state flags
4219 * Change settings on device based state flags. The flags are
4220 * in the userspace exported format.
4222 int dev_change_flags(struct net_device *dev, unsigned flags)
4225 int old_flags = dev->flags;
4227 ret = __dev_change_flags(dev, flags);
4231 changes = old_flags ^ dev->flags;
4233 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4235 __dev_notify_flags(dev, old_flags);
4238 EXPORT_SYMBOL(dev_change_flags);
4241 * dev_set_mtu - Change maximum transfer unit
4243 * @new_mtu: new transfer unit
4245 * Change the maximum transfer size of the network device.
4247 int dev_set_mtu(struct net_device *dev, int new_mtu)
4249 const struct net_device_ops *ops = dev->netdev_ops;
4252 if (new_mtu == dev->mtu)
4255 /* MTU must be positive. */
4259 if (!netif_device_present(dev))
4263 if (ops->ndo_change_mtu)
4264 err = ops->ndo_change_mtu(dev, new_mtu);
4268 if (!err && dev->flags & IFF_UP)
4269 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4272 EXPORT_SYMBOL(dev_set_mtu);
4275 * dev_set_mac_address - Change Media Access Control Address
4279 * Change the hardware (MAC) address of the device
4281 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4283 const struct net_device_ops *ops = dev->netdev_ops;
4286 if (!ops->ndo_set_mac_address)
4288 if (sa->sa_family != dev->type)
4290 if (!netif_device_present(dev))
4292 err = ops->ndo_set_mac_address(dev, sa);
4294 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4297 EXPORT_SYMBOL(dev_set_mac_address);
4300 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4302 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4305 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4311 case SIOCGIFFLAGS: /* Get interface flags */
4312 ifr->ifr_flags = (short) dev_get_flags(dev);
4315 case SIOCGIFMETRIC: /* Get the metric on the interface
4316 (currently unused) */
4317 ifr->ifr_metric = 0;
4320 case SIOCGIFMTU: /* Get the MTU of a device */
4321 ifr->ifr_mtu = dev->mtu;
4326 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4328 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4329 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4330 ifr->ifr_hwaddr.sa_family = dev->type;
4338 ifr->ifr_map.mem_start = dev->mem_start;
4339 ifr->ifr_map.mem_end = dev->mem_end;
4340 ifr->ifr_map.base_addr = dev->base_addr;
4341 ifr->ifr_map.irq = dev->irq;
4342 ifr->ifr_map.dma = dev->dma;
4343 ifr->ifr_map.port = dev->if_port;
4347 ifr->ifr_ifindex = dev->ifindex;
4351 ifr->ifr_qlen = dev->tx_queue_len;
4355 /* dev_ioctl() should ensure this case
4367 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4369 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4372 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4373 const struct net_device_ops *ops;
4378 ops = dev->netdev_ops;
4381 case SIOCSIFFLAGS: /* Set interface flags */
4382 return dev_change_flags(dev, ifr->ifr_flags);
4384 case SIOCSIFMETRIC: /* Set the metric on the interface
4385 (currently unused) */
4388 case SIOCSIFMTU: /* Set the MTU of a device */
4389 return dev_set_mtu(dev, ifr->ifr_mtu);
4392 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4394 case SIOCSIFHWBROADCAST:
4395 if (ifr->ifr_hwaddr.sa_family != dev->type)
4397 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4398 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4399 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4403 if (ops->ndo_set_config) {
4404 if (!netif_device_present(dev))
4406 return ops->ndo_set_config(dev, &ifr->ifr_map);
4411 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4412 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4414 if (!netif_device_present(dev))
4416 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4419 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4420 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4422 if (!netif_device_present(dev))
4424 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4427 if (ifr->ifr_qlen < 0)
4429 dev->tx_queue_len = ifr->ifr_qlen;
4433 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4434 return dev_change_name(dev, ifr->ifr_newname);
4437 * Unknown or private ioctl
4440 if ((cmd >= SIOCDEVPRIVATE &&
4441 cmd <= SIOCDEVPRIVATE + 15) ||
4442 cmd == SIOCBONDENSLAVE ||
4443 cmd == SIOCBONDRELEASE ||
4444 cmd == SIOCBONDSETHWADDR ||
4445 cmd == SIOCBONDSLAVEINFOQUERY ||
4446 cmd == SIOCBONDINFOQUERY ||
4447 cmd == SIOCBONDCHANGEACTIVE ||
4448 cmd == SIOCGMIIPHY ||
4449 cmd == SIOCGMIIREG ||
4450 cmd == SIOCSMIIREG ||
4451 cmd == SIOCBRADDIF ||
4452 cmd == SIOCBRDELIF ||
4453 cmd == SIOCSHWTSTAMP ||
4454 cmd == SIOCWANDEV) {
4456 if (ops->ndo_do_ioctl) {
4457 if (netif_device_present(dev))
4458 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4470 * This function handles all "interface"-type I/O control requests. The actual
4471 * 'doing' part of this is dev_ifsioc above.
4475 * dev_ioctl - network device ioctl
4476 * @net: the applicable net namespace
4477 * @cmd: command to issue
4478 * @arg: pointer to a struct ifreq in user space
4480 * Issue ioctl functions to devices. This is normally called by the
4481 * user space syscall interfaces but can sometimes be useful for
4482 * other purposes. The return value is the return from the syscall if
4483 * positive or a negative errno code on error.
4486 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4492 /* One special case: SIOCGIFCONF takes ifconf argument
4493 and requires shared lock, because it sleeps writing
4497 if (cmd == SIOCGIFCONF) {
4499 ret = dev_ifconf(net, (char __user *) arg);
4503 if (cmd == SIOCGIFNAME)
4504 return dev_ifname(net, (struct ifreq __user *)arg);
4506 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4509 ifr.ifr_name[IFNAMSIZ-1] = 0;
4511 colon = strchr(ifr.ifr_name, ':');
4516 * See which interface the caller is talking about.
4521 * These ioctl calls:
4522 * - can be done by all.
4523 * - atomic and do not require locking.
4534 dev_load(net, ifr.ifr_name);
4536 ret = dev_ifsioc_locked(net, &ifr, cmd);
4541 if (copy_to_user(arg, &ifr,
4542 sizeof(struct ifreq)))
4548 dev_load(net, ifr.ifr_name);
4550 ret = dev_ethtool(net, &ifr);
4555 if (copy_to_user(arg, &ifr,
4556 sizeof(struct ifreq)))
4562 * These ioctl calls:
4563 * - require superuser power.
4564 * - require strict serialization.
4570 if (!capable(CAP_NET_ADMIN))
4572 dev_load(net, ifr.ifr_name);
4574 ret = dev_ifsioc(net, &ifr, cmd);
4579 if (copy_to_user(arg, &ifr,
4580 sizeof(struct ifreq)))
4586 * These ioctl calls:
4587 * - require superuser power.
4588 * - require strict serialization.
4589 * - do not return a value
4599 case SIOCSIFHWBROADCAST:
4602 case SIOCBONDENSLAVE:
4603 case SIOCBONDRELEASE:
4604 case SIOCBONDSETHWADDR:
4605 case SIOCBONDCHANGEACTIVE:
4609 if (!capable(CAP_NET_ADMIN))
4612 case SIOCBONDSLAVEINFOQUERY:
4613 case SIOCBONDINFOQUERY:
4614 dev_load(net, ifr.ifr_name);
4616 ret = dev_ifsioc(net, &ifr, cmd);
4621 /* Get the per device memory space. We can add this but
4622 * currently do not support it */
4624 /* Set the per device memory buffer space.
4625 * Not applicable in our case */
4630 * Unknown or private ioctl.
4633 if (cmd == SIOCWANDEV ||
4634 (cmd >= SIOCDEVPRIVATE &&
4635 cmd <= SIOCDEVPRIVATE + 15)) {
4636 dev_load(net, ifr.ifr_name);
4638 ret = dev_ifsioc(net, &ifr, cmd);
4640 if (!ret && copy_to_user(arg, &ifr,
4641 sizeof(struct ifreq)))
4645 /* Take care of Wireless Extensions */
4646 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4647 return wext_handle_ioctl(net, &ifr, cmd, arg);
4654 * dev_new_index - allocate an ifindex
4655 * @net: the applicable net namespace
4657 * Returns a suitable unique value for a new device interface
4658 * number. The caller must hold the rtnl semaphore or the
4659 * dev_base_lock to be sure it remains unique.
4661 static int dev_new_index(struct net *net)
4667 if (!__dev_get_by_index(net, ifindex))
4672 /* Delayed registration/unregisteration */
4673 static LIST_HEAD(net_todo_list);
4675 static void net_set_todo(struct net_device *dev)
4677 list_add_tail(&dev->todo_list, &net_todo_list);
4680 static void rollback_registered_many(struct list_head *head)
4682 struct net_device *dev, *tmp;
4684 BUG_ON(dev_boot_phase);
4687 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4688 /* Some devices call without registering
4689 * for initialization unwind. Remove those
4690 * devices and proceed with the remaining.
4692 if (dev->reg_state == NETREG_UNINITIALIZED) {
4693 pr_debug("unregister_netdevice: device %s/%p never "
4694 "was registered\n", dev->name, dev);
4697 list_del(&dev->unreg_list);
4701 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4703 /* If device is running, close it first. */
4706 /* And unlink it from device chain. */
4707 unlist_netdevice(dev);
4709 dev->reg_state = NETREG_UNREGISTERING;
4714 list_for_each_entry(dev, head, unreg_list) {
4715 /* Shutdown queueing discipline. */
4719 /* Notify protocols, that we are about to destroy
4720 this device. They should clean all the things.
4722 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4724 if (!dev->rtnl_link_ops ||
4725 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4726 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4729 * Flush the unicast and multicast chains
4734 if (dev->netdev_ops->ndo_uninit)
4735 dev->netdev_ops->ndo_uninit(dev);
4737 /* Notifier chain MUST detach us from master device. */
4738 WARN_ON(dev->master);
4740 /* Remove entries from kobject tree */
4741 netdev_unregister_kobject(dev);
4744 /* Process any work delayed until the end of the batch */
4745 dev = list_first_entry(head, struct net_device, unreg_list);
4746 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4750 list_for_each_entry(dev, head, unreg_list)
4754 static void rollback_registered(struct net_device *dev)
4758 list_add(&dev->unreg_list, &single);
4759 rollback_registered_many(&single);
4762 static void __netdev_init_queue_locks_one(struct net_device *dev,
4763 struct netdev_queue *dev_queue,
4766 spin_lock_init(&dev_queue->_xmit_lock);
4767 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4768 dev_queue->xmit_lock_owner = -1;
4771 static void netdev_init_queue_locks(struct net_device *dev)
4773 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4774 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4777 unsigned long netdev_fix_features(unsigned long features, const char *name)
4779 /* Fix illegal SG+CSUM combinations. */
4780 if ((features & NETIF_F_SG) &&
4781 !(features & NETIF_F_ALL_CSUM)) {
4783 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4784 "checksum feature.\n", name);
4785 features &= ~NETIF_F_SG;
4788 /* TSO requires that SG is present as well. */
4789 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4791 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4792 "SG feature.\n", name);
4793 features &= ~NETIF_F_TSO;
4796 if (features & NETIF_F_UFO) {
4797 if (!(features & NETIF_F_GEN_CSUM)) {
4799 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4800 "since no NETIF_F_HW_CSUM feature.\n",
4802 features &= ~NETIF_F_UFO;
4805 if (!(features & NETIF_F_SG)) {
4807 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4808 "since no NETIF_F_SG feature.\n", name);
4809 features &= ~NETIF_F_UFO;
4815 EXPORT_SYMBOL(netdev_fix_features);
4818 * netif_stacked_transfer_operstate - transfer operstate
4819 * @rootdev: the root or lower level device to transfer state from
4820 * @dev: the device to transfer operstate to
4822 * Transfer operational state from root to device. This is normally
4823 * called when a stacking relationship exists between the root
4824 * device and the device(a leaf device).
4826 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4827 struct net_device *dev)
4829 if (rootdev->operstate == IF_OPER_DORMANT)
4830 netif_dormant_on(dev);
4832 netif_dormant_off(dev);
4834 if (netif_carrier_ok(rootdev)) {
4835 if (!netif_carrier_ok(dev))
4836 netif_carrier_on(dev);
4838 if (netif_carrier_ok(dev))
4839 netif_carrier_off(dev);
4842 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4845 * register_netdevice - register a network device
4846 * @dev: device to register
4848 * Take a completed network device structure and add it to the kernel
4849 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4850 * chain. 0 is returned on success. A negative errno code is returned
4851 * on a failure to set up the device, or if the name is a duplicate.
4853 * Callers must hold the rtnl semaphore. You may want
4854 * register_netdev() instead of this.
4857 * The locking appears insufficient to guarantee two parallel registers
4858 * will not get the same name.
4861 int register_netdevice(struct net_device *dev)
4864 struct net *net = dev_net(dev);
4866 BUG_ON(dev_boot_phase);
4871 /* When net_device's are persistent, this will be fatal. */
4872 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4875 spin_lock_init(&dev->addr_list_lock);
4876 netdev_set_addr_lockdep_class(dev);
4877 netdev_init_queue_locks(dev);
4882 if (!dev->num_rx_queues) {
4884 * Allocate a single RX queue if driver never called
4888 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
4894 dev->_rx->first = dev->_rx;
4895 atomic_set(&dev->_rx->count, 1);
4896 dev->num_rx_queues = 1;
4899 /* Init, if this function is available */
4900 if (dev->netdev_ops->ndo_init) {
4901 ret = dev->netdev_ops->ndo_init(dev);
4909 ret = dev_get_valid_name(net, dev->name, dev->name, 0);
4913 dev->ifindex = dev_new_index(net);
4914 if (dev->iflink == -1)
4915 dev->iflink = dev->ifindex;
4917 /* Fix illegal checksum combinations */
4918 if ((dev->features & NETIF_F_HW_CSUM) &&
4919 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4920 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4922 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4925 if ((dev->features & NETIF_F_NO_CSUM) &&
4926 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4927 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4929 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4932 dev->features = netdev_fix_features(dev->features, dev->name);
4934 /* Enable software GSO if SG is supported. */
4935 if (dev->features & NETIF_F_SG)
4936 dev->features |= NETIF_F_GSO;
4938 netdev_initialize_kobject(dev);
4940 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
4941 ret = notifier_to_errno(ret);
4945 ret = netdev_register_kobject(dev);
4948 dev->reg_state = NETREG_REGISTERED;
4951 * Default initial state at registry is that the
4952 * device is present.
4955 set_bit(__LINK_STATE_PRESENT, &dev->state);
4957 dev_init_scheduler(dev);
4959 list_netdevice(dev);
4961 /* Notify protocols, that a new device appeared. */
4962 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4963 ret = notifier_to_errno(ret);
4965 rollback_registered(dev);
4966 dev->reg_state = NETREG_UNREGISTERED;
4969 * Prevent userspace races by waiting until the network
4970 * device is fully setup before sending notifications.
4972 if (!dev->rtnl_link_ops ||
4973 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4974 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
4980 if (dev->netdev_ops->ndo_uninit)
4981 dev->netdev_ops->ndo_uninit(dev);
4984 EXPORT_SYMBOL(register_netdevice);
4987 * init_dummy_netdev - init a dummy network device for NAPI
4988 * @dev: device to init
4990 * This takes a network device structure and initialize the minimum
4991 * amount of fields so it can be used to schedule NAPI polls without
4992 * registering a full blown interface. This is to be used by drivers
4993 * that need to tie several hardware interfaces to a single NAPI
4994 * poll scheduler due to HW limitations.
4996 int init_dummy_netdev(struct net_device *dev)
4998 /* Clear everything. Note we don't initialize spinlocks
4999 * are they aren't supposed to be taken by any of the
5000 * NAPI code and this dummy netdev is supposed to be
5001 * only ever used for NAPI polls
5003 memset(dev, 0, sizeof(struct net_device));
5005 /* make sure we BUG if trying to hit standard
5006 * register/unregister code path
5008 dev->reg_state = NETREG_DUMMY;
5010 /* initialize the ref count */
5011 atomic_set(&dev->refcnt, 1);
5013 /* NAPI wants this */
5014 INIT_LIST_HEAD(&dev->napi_list);
5016 /* a dummy interface is started by default */
5017 set_bit(__LINK_STATE_PRESENT, &dev->state);
5018 set_bit(__LINK_STATE_START, &dev->state);
5022 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5026 * register_netdev - register a network device
5027 * @dev: device to register
5029 * Take a completed network device structure and add it to the kernel
5030 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5031 * chain. 0 is returned on success. A negative errno code is returned
5032 * on a failure to set up the device, or if the name is a duplicate.
5034 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5035 * and expands the device name if you passed a format string to
5038 int register_netdev(struct net_device *dev)
5045 * If the name is a format string the caller wants us to do a
5048 if (strchr(dev->name, '%')) {
5049 err = dev_alloc_name(dev, dev->name);
5054 err = register_netdevice(dev);
5059 EXPORT_SYMBOL(register_netdev);
5062 * netdev_wait_allrefs - wait until all references are gone.
5064 * This is called when unregistering network devices.
5066 * Any protocol or device that holds a reference should register
5067 * for netdevice notification, and cleanup and put back the
5068 * reference if they receive an UNREGISTER event.
5069 * We can get stuck here if buggy protocols don't correctly
5072 static void netdev_wait_allrefs(struct net_device *dev)
5074 unsigned long rebroadcast_time, warning_time;
5076 linkwatch_forget_dev(dev);
5078 rebroadcast_time = warning_time = jiffies;
5079 while (atomic_read(&dev->refcnt) != 0) {
5080 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5083 /* Rebroadcast unregister notification */
5084 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5085 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5086 * should have already handle it the first time */
5088 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5090 /* We must not have linkwatch events
5091 * pending on unregister. If this
5092 * happens, we simply run the queue
5093 * unscheduled, resulting in a noop
5096 linkwatch_run_queue();
5101 rebroadcast_time = jiffies;
5106 if (time_after(jiffies, warning_time + 10 * HZ)) {
5107 printk(KERN_EMERG "unregister_netdevice: "
5108 "waiting for %s to become free. Usage "
5110 dev->name, atomic_read(&dev->refcnt));
5111 warning_time = jiffies;
5120 * register_netdevice(x1);
5121 * register_netdevice(x2);
5123 * unregister_netdevice(y1);
5124 * unregister_netdevice(y2);
5130 * We are invoked by rtnl_unlock().
5131 * This allows us to deal with problems:
5132 * 1) We can delete sysfs objects which invoke hotplug
5133 * without deadlocking with linkwatch via keventd.
5134 * 2) Since we run with the RTNL semaphore not held, we can sleep
5135 * safely in order to wait for the netdev refcnt to drop to zero.
5137 * We must not return until all unregister events added during
5138 * the interval the lock was held have been completed.
5140 void netdev_run_todo(void)
5142 struct list_head list;
5144 /* Snapshot list, allow later requests */
5145 list_replace_init(&net_todo_list, &list);
5149 while (!list_empty(&list)) {
5150 struct net_device *dev
5151 = list_first_entry(&list, struct net_device, todo_list);
5152 list_del(&dev->todo_list);
5154 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5155 printk(KERN_ERR "network todo '%s' but state %d\n",
5156 dev->name, dev->reg_state);
5161 dev->reg_state = NETREG_UNREGISTERED;
5163 on_each_cpu(flush_backlog, dev, 1);
5165 netdev_wait_allrefs(dev);
5168 BUG_ON(atomic_read(&dev->refcnt));
5169 WARN_ON(dev->ip_ptr);
5170 WARN_ON(dev->ip6_ptr);
5171 WARN_ON(dev->dn_ptr);
5173 if (dev->destructor)
5174 dev->destructor(dev);
5176 /* Free network device */
5177 kobject_put(&dev->dev.kobj);
5182 * dev_txq_stats_fold - fold tx_queues stats
5183 * @dev: device to get statistics from
5184 * @stats: struct net_device_stats to hold results
5186 void dev_txq_stats_fold(const struct net_device *dev,
5187 struct net_device_stats *stats)
5189 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5191 struct netdev_queue *txq;
5193 for (i = 0; i < dev->num_tx_queues; i++) {
5194 txq = netdev_get_tx_queue(dev, i);
5195 tx_bytes += txq->tx_bytes;
5196 tx_packets += txq->tx_packets;
5197 tx_dropped += txq->tx_dropped;
5199 if (tx_bytes || tx_packets || tx_dropped) {
5200 stats->tx_bytes = tx_bytes;
5201 stats->tx_packets = tx_packets;
5202 stats->tx_dropped = tx_dropped;
5205 EXPORT_SYMBOL(dev_txq_stats_fold);
5208 * dev_get_stats - get network device statistics
5209 * @dev: device to get statistics from
5211 * Get network statistics from device. The device driver may provide
5212 * its own method by setting dev->netdev_ops->get_stats; otherwise
5213 * the internal statistics structure is used.
5215 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5217 const struct net_device_ops *ops = dev->netdev_ops;
5219 if (ops->ndo_get_stats)
5220 return ops->ndo_get_stats(dev);
5222 dev_txq_stats_fold(dev, &dev->stats);
5225 EXPORT_SYMBOL(dev_get_stats);
5227 static void netdev_init_one_queue(struct net_device *dev,
5228 struct netdev_queue *queue,
5234 static void netdev_init_queues(struct net_device *dev)
5236 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5237 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5238 spin_lock_init(&dev->tx_global_lock);
5242 * alloc_netdev_mq - allocate network device
5243 * @sizeof_priv: size of private data to allocate space for
5244 * @name: device name format string
5245 * @setup: callback to initialize device
5246 * @queue_count: the number of subqueues to allocate
5248 * Allocates a struct net_device with private data area for driver use
5249 * and performs basic initialization. Also allocates subquue structs
5250 * for each queue on the device at the end of the netdevice.
5252 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5253 void (*setup)(struct net_device *), unsigned int queue_count)
5255 struct netdev_queue *tx;
5256 struct net_device *dev;
5258 struct net_device *p;
5260 struct netdev_rx_queue *rx;
5264 BUG_ON(strlen(name) >= sizeof(dev->name));
5266 alloc_size = sizeof(struct net_device);
5268 /* ensure 32-byte alignment of private area */
5269 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5270 alloc_size += sizeof_priv;
5272 /* ensure 32-byte alignment of whole construct */
5273 alloc_size += NETDEV_ALIGN - 1;
5275 p = kzalloc(alloc_size, GFP_KERNEL);
5277 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5281 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5283 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5289 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5291 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5296 atomic_set(&rx->count, queue_count);
5299 * Set a pointer to first element in the array which holds the
5302 for (i = 0; i < queue_count; i++)
5306 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5307 dev->padded = (char *)dev - (char *)p;
5309 if (dev_addr_init(dev))
5315 dev_net_set(dev, &init_net);
5318 dev->num_tx_queues = queue_count;
5319 dev->real_num_tx_queues = queue_count;
5323 dev->num_rx_queues = queue_count;
5326 dev->gso_max_size = GSO_MAX_SIZE;
5328 netdev_init_queues(dev);
5330 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5331 dev->ethtool_ntuple_list.count = 0;
5332 INIT_LIST_HEAD(&dev->napi_list);
5333 INIT_LIST_HEAD(&dev->unreg_list);
5334 INIT_LIST_HEAD(&dev->link_watch_list);
5335 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5337 strcpy(dev->name, name);
5350 EXPORT_SYMBOL(alloc_netdev_mq);
5353 * free_netdev - free network device
5356 * This function does the last stage of destroying an allocated device
5357 * interface. The reference to the device object is released.
5358 * If this is the last reference then it will be freed.
5360 void free_netdev(struct net_device *dev)
5362 struct napi_struct *p, *n;
5364 release_net(dev_net(dev));
5368 /* Flush device addresses */
5369 dev_addr_flush(dev);
5371 /* Clear ethtool n-tuple list */
5372 ethtool_ntuple_flush(dev);
5374 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5377 /* Compatibility with error handling in drivers */
5378 if (dev->reg_state == NETREG_UNINITIALIZED) {
5379 kfree((char *)dev - dev->padded);
5383 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5384 dev->reg_state = NETREG_RELEASED;
5386 /* will free via device release */
5387 put_device(&dev->dev);
5389 EXPORT_SYMBOL(free_netdev);
5392 * synchronize_net - Synchronize with packet receive processing
5394 * Wait for packets currently being received to be done.
5395 * Does not block later packets from starting.
5397 void synchronize_net(void)
5402 EXPORT_SYMBOL(synchronize_net);
5405 * unregister_netdevice_queue - remove device from the kernel
5409 * This function shuts down a device interface and removes it
5410 * from the kernel tables.
5411 * If head not NULL, device is queued to be unregistered later.
5413 * Callers must hold the rtnl semaphore. You may want
5414 * unregister_netdev() instead of this.
5417 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5422 list_move_tail(&dev->unreg_list, head);
5424 rollback_registered(dev);
5425 /* Finish processing unregister after unlock */
5429 EXPORT_SYMBOL(unregister_netdevice_queue);
5432 * unregister_netdevice_many - unregister many devices
5433 * @head: list of devices
5435 void unregister_netdevice_many(struct list_head *head)
5437 struct net_device *dev;
5439 if (!list_empty(head)) {
5440 rollback_registered_many(head);
5441 list_for_each_entry(dev, head, unreg_list)
5445 EXPORT_SYMBOL(unregister_netdevice_many);
5448 * unregister_netdev - remove device from the kernel
5451 * This function shuts down a device interface and removes it
5452 * from the kernel tables.
5454 * This is just a wrapper for unregister_netdevice that takes
5455 * the rtnl semaphore. In general you want to use this and not
5456 * unregister_netdevice.
5458 void unregister_netdev(struct net_device *dev)
5461 unregister_netdevice(dev);
5464 EXPORT_SYMBOL(unregister_netdev);
5467 * dev_change_net_namespace - move device to different nethost namespace
5469 * @net: network namespace
5470 * @pat: If not NULL name pattern to try if the current device name
5471 * is already taken in the destination network namespace.
5473 * This function shuts down a device interface and moves it
5474 * to a new network namespace. On success 0 is returned, on
5475 * a failure a netagive errno code is returned.
5477 * Callers must hold the rtnl semaphore.
5480 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5486 /* Don't allow namespace local devices to be moved. */
5488 if (dev->features & NETIF_F_NETNS_LOCAL)
5492 /* Don't allow real devices to be moved when sysfs
5496 if (dev->dev.parent)
5500 /* Ensure the device has been registrered */
5502 if (dev->reg_state != NETREG_REGISTERED)
5505 /* Get out if there is nothing todo */
5507 if (net_eq(dev_net(dev), net))
5510 /* Pick the destination device name, and ensure
5511 * we can use it in the destination network namespace.
5514 if (__dev_get_by_name(net, dev->name)) {
5515 /* We get here if we can't use the current device name */
5518 if (dev_get_valid_name(net, pat, dev->name, 1))
5523 * And now a mini version of register_netdevice unregister_netdevice.
5526 /* If device is running close it first. */
5529 /* And unlink it from device chain */
5531 unlist_netdevice(dev);
5535 /* Shutdown queueing discipline. */
5538 /* Notify protocols, that we are about to destroy
5539 this device. They should clean all the things.
5541 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5542 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5545 * Flush the unicast and multicast chains
5550 netdev_unregister_kobject(dev);
5552 /* Actually switch the network namespace */
5553 dev_net_set(dev, net);
5555 /* If there is an ifindex conflict assign a new one */
5556 if (__dev_get_by_index(net, dev->ifindex)) {
5557 int iflink = (dev->iflink == dev->ifindex);
5558 dev->ifindex = dev_new_index(net);
5560 dev->iflink = dev->ifindex;
5563 /* Fixup kobjects */
5564 err = netdev_register_kobject(dev);
5567 /* Add the device back in the hashes */
5568 list_netdevice(dev);
5570 /* Notify protocols, that a new device appeared. */
5571 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5574 * Prevent userspace races by waiting until the network
5575 * device is fully setup before sending notifications.
5577 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5584 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5586 static int dev_cpu_callback(struct notifier_block *nfb,
5587 unsigned long action,
5590 struct sk_buff **list_skb;
5591 struct Qdisc **list_net;
5592 struct sk_buff *skb;
5593 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5594 struct softnet_data *sd, *oldsd;
5596 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5599 local_irq_disable();
5600 cpu = smp_processor_id();
5601 sd = &per_cpu(softnet_data, cpu);
5602 oldsd = &per_cpu(softnet_data, oldcpu);
5604 /* Find end of our completion_queue. */
5605 list_skb = &sd->completion_queue;
5607 list_skb = &(*list_skb)->next;
5608 /* Append completion queue from offline CPU. */
5609 *list_skb = oldsd->completion_queue;
5610 oldsd->completion_queue = NULL;
5612 /* Find end of our output_queue. */
5613 list_net = &sd->output_queue;
5615 list_net = &(*list_net)->next_sched;
5616 /* Append output queue from offline CPU. */
5617 *list_net = oldsd->output_queue;
5618 oldsd->output_queue = NULL;
5620 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5623 /* Process offline CPU's input_pkt_queue */
5624 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5626 input_queue_head_incr(oldsd);
5634 * netdev_increment_features - increment feature set by one
5635 * @all: current feature set
5636 * @one: new feature set
5637 * @mask: mask feature set
5639 * Computes a new feature set after adding a device with feature set
5640 * @one to the master device with current feature set @all. Will not
5641 * enable anything that is off in @mask. Returns the new feature set.
5643 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5646 /* If device needs checksumming, downgrade to it. */
5647 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5648 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5649 else if (mask & NETIF_F_ALL_CSUM) {
5650 /* If one device supports v4/v6 checksumming, set for all. */
5651 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5652 !(all & NETIF_F_GEN_CSUM)) {
5653 all &= ~NETIF_F_ALL_CSUM;
5654 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5657 /* If one device supports hw checksumming, set for all. */
5658 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5659 all &= ~NETIF_F_ALL_CSUM;
5660 all |= NETIF_F_HW_CSUM;
5664 one |= NETIF_F_ALL_CSUM;
5666 one |= all & NETIF_F_ONE_FOR_ALL;
5667 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5668 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5672 EXPORT_SYMBOL(netdev_increment_features);
5674 static struct hlist_head *netdev_create_hash(void)
5677 struct hlist_head *hash;
5679 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5681 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5682 INIT_HLIST_HEAD(&hash[i]);
5687 /* Initialize per network namespace state */
5688 static int __net_init netdev_init(struct net *net)
5690 INIT_LIST_HEAD(&net->dev_base_head);
5692 net->dev_name_head = netdev_create_hash();
5693 if (net->dev_name_head == NULL)
5696 net->dev_index_head = netdev_create_hash();
5697 if (net->dev_index_head == NULL)
5703 kfree(net->dev_name_head);
5709 * netdev_drivername - network driver for the device
5710 * @dev: network device
5711 * @buffer: buffer for resulting name
5712 * @len: size of buffer
5714 * Determine network driver for device.
5716 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5718 const struct device_driver *driver;
5719 const struct device *parent;
5721 if (len <= 0 || !buffer)
5725 parent = dev->dev.parent;
5730 driver = parent->driver;
5731 if (driver && driver->name)
5732 strlcpy(buffer, driver->name, len);
5736 static void __net_exit netdev_exit(struct net *net)
5738 kfree(net->dev_name_head);
5739 kfree(net->dev_index_head);
5742 static struct pernet_operations __net_initdata netdev_net_ops = {
5743 .init = netdev_init,
5744 .exit = netdev_exit,
5747 static void __net_exit default_device_exit(struct net *net)
5749 struct net_device *dev, *aux;
5751 * Push all migratable network devices back to the
5752 * initial network namespace
5755 for_each_netdev_safe(net, dev, aux) {
5757 char fb_name[IFNAMSIZ];
5759 /* Ignore unmoveable devices (i.e. loopback) */
5760 if (dev->features & NETIF_F_NETNS_LOCAL)
5763 /* Leave virtual devices for the generic cleanup */
5764 if (dev->rtnl_link_ops)
5767 /* Push remaing network devices to init_net */
5768 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5769 err = dev_change_net_namespace(dev, &init_net, fb_name);
5771 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5772 __func__, dev->name, err);
5779 static void __net_exit default_device_exit_batch(struct list_head *net_list)
5781 /* At exit all network devices most be removed from a network
5782 * namespace. Do this in the reverse order of registeration.
5783 * Do this across as many network namespaces as possible to
5784 * improve batching efficiency.
5786 struct net_device *dev;
5788 LIST_HEAD(dev_kill_list);
5791 list_for_each_entry(net, net_list, exit_list) {
5792 for_each_netdev_reverse(net, dev) {
5793 if (dev->rtnl_link_ops)
5794 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
5796 unregister_netdevice_queue(dev, &dev_kill_list);
5799 unregister_netdevice_many(&dev_kill_list);
5803 static struct pernet_operations __net_initdata default_device_ops = {
5804 .exit = default_device_exit,
5805 .exit_batch = default_device_exit_batch,
5809 * Initialize the DEV module. At boot time this walks the device list and
5810 * unhooks any devices that fail to initialise (normally hardware not
5811 * present) and leaves us with a valid list of present and active devices.
5816 * This is called single threaded during boot, so no need
5817 * to take the rtnl semaphore.
5819 static int __init net_dev_init(void)
5821 int i, rc = -ENOMEM;
5823 BUG_ON(!dev_boot_phase);
5825 if (dev_proc_init())
5828 if (netdev_kobject_init())
5831 INIT_LIST_HEAD(&ptype_all);
5832 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5833 INIT_LIST_HEAD(&ptype_base[i]);
5835 if (register_pernet_subsys(&netdev_net_ops))
5839 * Initialise the packet receive queues.
5842 for_each_possible_cpu(i) {
5843 struct softnet_data *sd = &per_cpu(softnet_data, i);
5845 skb_queue_head_init(&sd->input_pkt_queue);
5846 sd->completion_queue = NULL;
5847 INIT_LIST_HEAD(&sd->poll_list);
5850 sd->csd.func = rps_trigger_softirq;
5856 sd->backlog.poll = process_backlog;
5857 sd->backlog.weight = weight_p;
5858 sd->backlog.gro_list = NULL;
5859 sd->backlog.gro_count = 0;
5864 /* The loopback device is special if any other network devices
5865 * is present in a network namespace the loopback device must
5866 * be present. Since we now dynamically allocate and free the
5867 * loopback device ensure this invariant is maintained by
5868 * keeping the loopback device as the first device on the
5869 * list of network devices. Ensuring the loopback devices
5870 * is the first device that appears and the last network device
5873 if (register_pernet_device(&loopback_net_ops))
5876 if (register_pernet_device(&default_device_ops))
5879 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5880 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5882 hotcpu_notifier(dev_cpu_callback, 0);
5890 subsys_initcall(net_dev_init);
5892 static int __init initialize_hashrnd(void)
5894 get_random_bytes(&hashrnd, sizeof(hashrnd));
5898 late_initcall_sync(initialize_hashrnd);