2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
104 #include <linux/if_bridge.h>
105 #include <linux/if_macvlan.h>
107 #include <net/pkt_sched.h>
108 #include <net/checksum.h>
109 #include <net/xfrm.h>
110 #include <linux/highmem.h>
111 #include <linux/init.h>
112 #include <linux/kmod.h>
113 #include <linux/module.h>
114 #include <linux/netpoll.h>
115 #include <linux/rcupdate.h>
116 #include <linux/delay.h>
117 #include <net/wext.h>
118 #include <net/iw_handler.h>
119 #include <asm/current.h>
120 #include <linux/audit.h>
121 #include <linux/dmaengine.h>
122 #include <linux/err.h>
123 #include <linux/ctype.h>
124 #include <linux/if_arp.h>
125 #include <linux/if_vlan.h>
126 #include <linux/ip.h>
128 #include <linux/ipv6.h>
129 #include <linux/in.h>
130 #include <linux/jhash.h>
131 #include <linux/random.h>
132 #include <trace/events/napi.h>
133 #include <linux/pci.h>
135 #include "net-sysfs.h"
137 /* Instead of increasing this, you should create a hash table. */
138 #define MAX_GRO_SKBS 8
140 /* This should be increased if a protocol with a bigger head is added. */
141 #define GRO_MAX_HEAD (MAX_HEADER + 128)
144 * The list of packet types we will receive (as opposed to discard)
145 * and the routines to invoke.
147 * Why 16. Because with 16 the only overlap we get on a hash of the
148 * low nibble of the protocol value is RARP/SNAP/X.25.
150 * NOTE: That is no longer true with the addition of VLAN tags. Not
151 * sure which should go first, but I bet it won't make much
152 * difference if we are running VLANs. The good news is that
153 * this protocol won't be in the list unless compiled in, so
154 * the average user (w/out VLANs) will not be adversely affected.
171 #define PTYPE_HASH_SIZE (16)
172 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
174 static DEFINE_SPINLOCK(ptype_lock);
175 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
176 static struct list_head ptype_all __read_mostly; /* Taps */
179 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
182 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
184 * Writers must hold the rtnl semaphore while they loop through the
185 * dev_base_head list, and hold dev_base_lock for writing when they do the
186 * actual updates. This allows pure readers to access the list even
187 * while a writer is preparing to update it.
189 * To put it another way, dev_base_lock is held for writing only to
190 * protect against pure readers; the rtnl semaphore provides the
191 * protection against other writers.
193 * See, for example usages, register_netdevice() and
194 * unregister_netdevice(), which must be called with the rtnl
197 DEFINE_RWLOCK(dev_base_lock);
198 EXPORT_SYMBOL(dev_base_lock);
200 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
202 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
203 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
206 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
208 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
211 static inline void rps_lock(struct softnet_data *sd)
214 spin_lock(&sd->input_pkt_queue.lock);
218 static inline void rps_unlock(struct softnet_data *sd)
221 spin_unlock(&sd->input_pkt_queue.lock);
225 /* Device list insertion */
226 static int list_netdevice(struct net_device *dev)
228 struct net *net = dev_net(dev);
232 write_lock_bh(&dev_base_lock);
233 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
234 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
235 hlist_add_head_rcu(&dev->index_hlist,
236 dev_index_hash(net, dev->ifindex));
237 write_unlock_bh(&dev_base_lock);
241 /* Device list removal
242 * caller must respect a RCU grace period before freeing/reusing dev
244 static void unlist_netdevice(struct net_device *dev)
248 /* Unlink dev from the device chain */
249 write_lock_bh(&dev_base_lock);
250 list_del_rcu(&dev->dev_list);
251 hlist_del_rcu(&dev->name_hlist);
252 hlist_del_rcu(&dev->index_hlist);
253 write_unlock_bh(&dev_base_lock);
260 static RAW_NOTIFIER_HEAD(netdev_chain);
263 * Device drivers call our routines to queue packets here. We empty the
264 * queue in the local softnet handler.
267 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
268 EXPORT_PER_CPU_SYMBOL(softnet_data);
270 #ifdef CONFIG_LOCKDEP
272 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
273 * according to dev->type
275 static const unsigned short netdev_lock_type[] =
276 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
277 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
278 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
279 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
280 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
281 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
282 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
283 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
284 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
285 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
286 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
287 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
288 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
289 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
290 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
291 ARPHRD_VOID, ARPHRD_NONE};
293 static const char *const netdev_lock_name[] =
294 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
295 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
296 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
297 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
298 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
299 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
300 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
301 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
302 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
303 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
304 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
305 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
306 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
307 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
308 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
309 "_xmit_VOID", "_xmit_NONE"};
311 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
312 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
314 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
318 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
319 if (netdev_lock_type[i] == dev_type)
321 /* the last key is used by default */
322 return ARRAY_SIZE(netdev_lock_type) - 1;
325 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
326 unsigned short dev_type)
330 i = netdev_lock_pos(dev_type);
331 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
332 netdev_lock_name[i]);
335 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
339 i = netdev_lock_pos(dev->type);
340 lockdep_set_class_and_name(&dev->addr_list_lock,
341 &netdev_addr_lock_key[i],
342 netdev_lock_name[i]);
345 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
346 unsigned short dev_type)
349 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
354 /*******************************************************************************
356 Protocol management and registration routines
358 *******************************************************************************/
361 * Add a protocol ID to the list. Now that the input handler is
362 * smarter we can dispense with all the messy stuff that used to be
365 * BEWARE!!! Protocol handlers, mangling input packets,
366 * MUST BE last in hash buckets and checking protocol handlers
367 * MUST start from promiscuous ptype_all chain in net_bh.
368 * It is true now, do not change it.
369 * Explanation follows: if protocol handler, mangling packet, will
370 * be the first on list, it is not able to sense, that packet
371 * is cloned and should be copied-on-write, so that it will
372 * change it and subsequent readers will get broken packet.
377 * dev_add_pack - add packet handler
378 * @pt: packet type declaration
380 * Add a protocol handler to the networking stack. The passed &packet_type
381 * is linked into kernel lists and may not be freed until it has been
382 * removed from the kernel lists.
384 * This call does not sleep therefore it can not
385 * guarantee all CPU's that are in middle of receiving packets
386 * will see the new packet type (until the next received packet).
389 void dev_add_pack(struct packet_type *pt)
393 spin_lock_bh(&ptype_lock);
394 if (pt->type == htons(ETH_P_ALL))
395 list_add_rcu(&pt->list, &ptype_all);
397 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
398 list_add_rcu(&pt->list, &ptype_base[hash]);
400 spin_unlock_bh(&ptype_lock);
402 EXPORT_SYMBOL(dev_add_pack);
405 * __dev_remove_pack - remove packet handler
406 * @pt: packet type declaration
408 * Remove a protocol handler that was previously added to the kernel
409 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
410 * from the kernel lists and can be freed or reused once this function
413 * The packet type might still be in use by receivers
414 * and must not be freed until after all the CPU's have gone
415 * through a quiescent state.
417 void __dev_remove_pack(struct packet_type *pt)
419 struct list_head *head;
420 struct packet_type *pt1;
422 spin_lock_bh(&ptype_lock);
424 if (pt->type == htons(ETH_P_ALL))
427 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
429 list_for_each_entry(pt1, head, list) {
431 list_del_rcu(&pt->list);
436 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
438 spin_unlock_bh(&ptype_lock);
440 EXPORT_SYMBOL(__dev_remove_pack);
443 * dev_remove_pack - remove packet handler
444 * @pt: packet type declaration
446 * Remove a protocol handler that was previously added to the kernel
447 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
448 * from the kernel lists and can be freed or reused once this function
451 * This call sleeps to guarantee that no CPU is looking at the packet
454 void dev_remove_pack(struct packet_type *pt)
456 __dev_remove_pack(pt);
460 EXPORT_SYMBOL(dev_remove_pack);
462 /******************************************************************************
464 Device Boot-time Settings Routines
466 *******************************************************************************/
468 /* Boot time configuration table */
469 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
472 * netdev_boot_setup_add - add new setup entry
473 * @name: name of the device
474 * @map: configured settings for the device
476 * Adds new setup entry to the dev_boot_setup list. The function
477 * returns 0 on error and 1 on success. This is a generic routine to
480 static int netdev_boot_setup_add(char *name, struct ifmap *map)
482 struct netdev_boot_setup *s;
486 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
487 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
488 memset(s[i].name, 0, sizeof(s[i].name));
489 strlcpy(s[i].name, name, IFNAMSIZ);
490 memcpy(&s[i].map, map, sizeof(s[i].map));
495 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
499 * netdev_boot_setup_check - check boot time settings
500 * @dev: the netdevice
502 * Check boot time settings for the device.
503 * The found settings are set for the device to be used
504 * later in the device probing.
505 * Returns 0 if no settings found, 1 if they are.
507 int netdev_boot_setup_check(struct net_device *dev)
509 struct netdev_boot_setup *s = dev_boot_setup;
512 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
513 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
514 !strcmp(dev->name, s[i].name)) {
515 dev->irq = s[i].map.irq;
516 dev->base_addr = s[i].map.base_addr;
517 dev->mem_start = s[i].map.mem_start;
518 dev->mem_end = s[i].map.mem_end;
524 EXPORT_SYMBOL(netdev_boot_setup_check);
528 * netdev_boot_base - get address from boot time settings
529 * @prefix: prefix for network device
530 * @unit: id for network device
532 * Check boot time settings for the base address of device.
533 * The found settings are set for the device to be used
534 * later in the device probing.
535 * Returns 0 if no settings found.
537 unsigned long netdev_boot_base(const char *prefix, int unit)
539 const struct netdev_boot_setup *s = dev_boot_setup;
543 sprintf(name, "%s%d", prefix, unit);
546 * If device already registered then return base of 1
547 * to indicate not to probe for this interface
549 if (__dev_get_by_name(&init_net, name))
552 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
553 if (!strcmp(name, s[i].name))
554 return s[i].map.base_addr;
559 * Saves at boot time configured settings for any netdevice.
561 int __init netdev_boot_setup(char *str)
566 str = get_options(str, ARRAY_SIZE(ints), ints);
571 memset(&map, 0, sizeof(map));
575 map.base_addr = ints[2];
577 map.mem_start = ints[3];
579 map.mem_end = ints[4];
581 /* Add new entry to the list */
582 return netdev_boot_setup_add(str, &map);
585 __setup("netdev=", netdev_boot_setup);
587 /*******************************************************************************
589 Device Interface Subroutines
591 *******************************************************************************/
594 * __dev_get_by_name - find a device by its name
595 * @net: the applicable net namespace
596 * @name: name to find
598 * Find an interface by name. Must be called under RTNL semaphore
599 * or @dev_base_lock. If the name is found a pointer to the device
600 * is returned. If the name is not found then %NULL is returned. The
601 * reference counters are not incremented so the caller must be
602 * careful with locks.
605 struct net_device *__dev_get_by_name(struct net *net, const char *name)
607 struct hlist_node *p;
608 struct net_device *dev;
609 struct hlist_head *head = dev_name_hash(net, name);
611 hlist_for_each_entry(dev, p, head, name_hlist)
612 if (!strncmp(dev->name, name, IFNAMSIZ))
617 EXPORT_SYMBOL(__dev_get_by_name);
620 * dev_get_by_name_rcu - find a device by its name
621 * @net: the applicable net namespace
622 * @name: name to find
624 * Find an interface by name.
625 * If the name is found a pointer to the device is returned.
626 * If the name is not found then %NULL is returned.
627 * The reference counters are not incremented so the caller must be
628 * careful with locks. The caller must hold RCU lock.
631 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
633 struct hlist_node *p;
634 struct net_device *dev;
635 struct hlist_head *head = dev_name_hash(net, name);
637 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
638 if (!strncmp(dev->name, name, IFNAMSIZ))
643 EXPORT_SYMBOL(dev_get_by_name_rcu);
646 * dev_get_by_name - find a device by its name
647 * @net: the applicable net namespace
648 * @name: name to find
650 * Find an interface by name. This can be called from any
651 * context and does its own locking. The returned handle has
652 * the usage count incremented and the caller must use dev_put() to
653 * release it when it is no longer needed. %NULL is returned if no
654 * matching device is found.
657 struct net_device *dev_get_by_name(struct net *net, const char *name)
659 struct net_device *dev;
662 dev = dev_get_by_name_rcu(net, name);
668 EXPORT_SYMBOL(dev_get_by_name);
671 * __dev_get_by_index - find a device by its ifindex
672 * @net: the applicable net namespace
673 * @ifindex: index of device
675 * Search for an interface by index. Returns %NULL if the device
676 * is not found or a pointer to the device. The device has not
677 * had its reference counter increased so the caller must be careful
678 * about locking. The caller must hold either the RTNL semaphore
682 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
684 struct hlist_node *p;
685 struct net_device *dev;
686 struct hlist_head *head = dev_index_hash(net, ifindex);
688 hlist_for_each_entry(dev, p, head, index_hlist)
689 if (dev->ifindex == ifindex)
694 EXPORT_SYMBOL(__dev_get_by_index);
697 * dev_get_by_index_rcu - find a device by its ifindex
698 * @net: the applicable net namespace
699 * @ifindex: index of device
701 * Search for an interface by index. Returns %NULL if the device
702 * is not found or a pointer to the device. The device has not
703 * had its reference counter increased so the caller must be careful
704 * about locking. The caller must hold RCU lock.
707 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
709 struct hlist_node *p;
710 struct net_device *dev;
711 struct hlist_head *head = dev_index_hash(net, ifindex);
713 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
714 if (dev->ifindex == ifindex)
719 EXPORT_SYMBOL(dev_get_by_index_rcu);
723 * dev_get_by_index - find a device by its ifindex
724 * @net: the applicable net namespace
725 * @ifindex: index of device
727 * Search for an interface by index. Returns NULL if the device
728 * is not found or a pointer to the device. The device returned has
729 * had a reference added and the pointer is safe until the user calls
730 * dev_put to indicate they have finished with it.
733 struct net_device *dev_get_by_index(struct net *net, int ifindex)
735 struct net_device *dev;
738 dev = dev_get_by_index_rcu(net, ifindex);
744 EXPORT_SYMBOL(dev_get_by_index);
747 * dev_getbyhwaddr - find a device by its hardware address
748 * @net: the applicable net namespace
749 * @type: media type of device
750 * @ha: hardware address
752 * Search for an interface by MAC address. Returns NULL if the device
753 * is not found or a pointer to the device. The caller must hold the
754 * rtnl semaphore. The returned device has not had its ref count increased
755 * and the caller must therefore be careful about locking
758 * If the API was consistent this would be __dev_get_by_hwaddr
761 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
763 struct net_device *dev;
767 for_each_netdev(net, dev)
768 if (dev->type == type &&
769 !memcmp(dev->dev_addr, ha, dev->addr_len))
774 EXPORT_SYMBOL(dev_getbyhwaddr);
776 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
778 struct net_device *dev;
781 for_each_netdev(net, dev)
782 if (dev->type == type)
787 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
789 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
791 struct net_device *dev, *ret = NULL;
794 for_each_netdev_rcu(net, dev)
795 if (dev->type == type) {
803 EXPORT_SYMBOL(dev_getfirstbyhwtype);
806 * dev_get_by_flags - find any device with given flags
807 * @net: the applicable net namespace
808 * @if_flags: IFF_* values
809 * @mask: bitmask of bits in if_flags to check
811 * Search for any interface with the given flags. Returns NULL if a device
812 * is not found or a pointer to the device. The device returned has
813 * had a reference added and the pointer is safe until the user calls
814 * dev_put to indicate they have finished with it.
817 struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
820 struct net_device *dev, *ret;
824 for_each_netdev_rcu(net, dev) {
825 if (((dev->flags ^ if_flags) & mask) == 0) {
834 EXPORT_SYMBOL(dev_get_by_flags);
837 * dev_valid_name - check if name is okay for network device
840 * Network device names need to be valid file names to
841 * to allow sysfs to work. We also disallow any kind of
844 int dev_valid_name(const char *name)
848 if (strlen(name) >= IFNAMSIZ)
850 if (!strcmp(name, ".") || !strcmp(name, ".."))
854 if (*name == '/' || isspace(*name))
860 EXPORT_SYMBOL(dev_valid_name);
863 * __dev_alloc_name - allocate a name for a device
864 * @net: network namespace to allocate the device name in
865 * @name: name format string
866 * @buf: scratch buffer and result name string
868 * Passed a format string - eg "lt%d" it will try and find a suitable
869 * id. It scans list of devices to build up a free map, then chooses
870 * the first empty slot. The caller must hold the dev_base or rtnl lock
871 * while allocating the name and adding the device in order to avoid
873 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
874 * Returns the number of the unit assigned or a negative errno code.
877 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
881 const int max_netdevices = 8*PAGE_SIZE;
882 unsigned long *inuse;
883 struct net_device *d;
885 p = strnchr(name, IFNAMSIZ-1, '%');
888 * Verify the string as this thing may have come from
889 * the user. There must be either one "%d" and no other "%"
892 if (p[1] != 'd' || strchr(p + 2, '%'))
895 /* Use one page as a bit array of possible slots */
896 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
900 for_each_netdev(net, d) {
901 if (!sscanf(d->name, name, &i))
903 if (i < 0 || i >= max_netdevices)
906 /* avoid cases where sscanf is not exact inverse of printf */
907 snprintf(buf, IFNAMSIZ, name, i);
908 if (!strncmp(buf, d->name, IFNAMSIZ))
912 i = find_first_zero_bit(inuse, max_netdevices);
913 free_page((unsigned long) inuse);
917 snprintf(buf, IFNAMSIZ, name, i);
918 if (!__dev_get_by_name(net, buf))
921 /* It is possible to run out of possible slots
922 * when the name is long and there isn't enough space left
923 * for the digits, or if all bits are used.
929 * dev_alloc_name - allocate a name for a device
931 * @name: name format string
933 * Passed a format string - eg "lt%d" it will try and find a suitable
934 * id. It scans list of devices to build up a free map, then chooses
935 * the first empty slot. The caller must hold the dev_base or rtnl lock
936 * while allocating the name and adding the device in order to avoid
938 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
939 * Returns the number of the unit assigned or a negative errno code.
942 int dev_alloc_name(struct net_device *dev, const char *name)
948 BUG_ON(!dev_net(dev));
950 ret = __dev_alloc_name(net, name, buf);
952 strlcpy(dev->name, buf, IFNAMSIZ);
955 EXPORT_SYMBOL(dev_alloc_name);
957 static int dev_get_valid_name(struct net *net, const char *name, char *buf,
960 if (!dev_valid_name(name))
963 if (fmt && strchr(name, '%'))
964 return __dev_alloc_name(net, name, buf);
965 else if (__dev_get_by_name(net, name))
967 else if (buf != name)
968 strlcpy(buf, name, IFNAMSIZ);
974 * dev_change_name - change name of a device
976 * @newname: name (or format string) must be at least IFNAMSIZ
978 * Change name of a device, can pass format strings "eth%d".
981 int dev_change_name(struct net_device *dev, const char *newname)
983 char oldname[IFNAMSIZ];
989 BUG_ON(!dev_net(dev));
992 if (dev->flags & IFF_UP)
995 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
998 memcpy(oldname, dev->name, IFNAMSIZ);
1000 err = dev_get_valid_name(net, newname, dev->name, 1);
1005 /* For now only devices in the initial network namespace
1008 if (net_eq(net, &init_net)) {
1009 ret = device_rename(&dev->dev, dev->name);
1011 memcpy(dev->name, oldname, IFNAMSIZ);
1016 write_lock_bh(&dev_base_lock);
1017 hlist_del(&dev->name_hlist);
1018 write_unlock_bh(&dev_base_lock);
1022 write_lock_bh(&dev_base_lock);
1023 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1024 write_unlock_bh(&dev_base_lock);
1026 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1027 ret = notifier_to_errno(ret);
1030 /* err >= 0 after dev_alloc_name() or stores the first errno */
1033 memcpy(dev->name, oldname, IFNAMSIZ);
1037 "%s: name change rollback failed: %d.\n",
1046 * dev_set_alias - change ifalias of a device
1048 * @alias: name up to IFALIASZ
1049 * @len: limit of bytes to copy from info
1051 * Set ifalias for a device,
1053 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1057 if (len >= IFALIASZ)
1062 kfree(dev->ifalias);
1063 dev->ifalias = NULL;
1068 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1072 strlcpy(dev->ifalias, alias, len+1);
1078 * netdev_features_change - device changes features
1079 * @dev: device to cause notification
1081 * Called to indicate a device has changed features.
1083 void netdev_features_change(struct net_device *dev)
1085 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1087 EXPORT_SYMBOL(netdev_features_change);
1090 * netdev_state_change - device changes state
1091 * @dev: device to cause notification
1093 * Called to indicate a device has changed state. This function calls
1094 * the notifier chains for netdev_chain and sends a NEWLINK message
1095 * to the routing socket.
1097 void netdev_state_change(struct net_device *dev)
1099 if (dev->flags & IFF_UP) {
1100 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1101 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1104 EXPORT_SYMBOL(netdev_state_change);
1106 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1108 return call_netdevice_notifiers(event, dev);
1110 EXPORT_SYMBOL(netdev_bonding_change);
1113 * dev_load - load a network module
1114 * @net: the applicable net namespace
1115 * @name: name of interface
1117 * If a network interface is not present and the process has suitable
1118 * privileges this function loads the module. If module loading is not
1119 * available in this kernel then it becomes a nop.
1122 void dev_load(struct net *net, const char *name)
1124 struct net_device *dev;
1127 dev = dev_get_by_name_rcu(net, name);
1130 if (!dev && capable(CAP_NET_ADMIN))
1131 request_module("%s", name);
1133 EXPORT_SYMBOL(dev_load);
1135 static int __dev_open(struct net_device *dev)
1137 const struct net_device_ops *ops = dev->netdev_ops;
1143 * Is it even present?
1145 if (!netif_device_present(dev))
1148 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1149 ret = notifier_to_errno(ret);
1154 * Call device private open method
1156 set_bit(__LINK_STATE_START, &dev->state);
1158 if (ops->ndo_validate_addr)
1159 ret = ops->ndo_validate_addr(dev);
1161 if (!ret && ops->ndo_open)
1162 ret = ops->ndo_open(dev);
1165 * If it went open OK then:
1169 clear_bit(__LINK_STATE_START, &dev->state);
1174 dev->flags |= IFF_UP;
1179 net_dmaengine_get();
1182 * Initialize multicasting status
1184 dev_set_rx_mode(dev);
1187 * Wakeup transmit queue engine
1196 * dev_open - prepare an interface for use.
1197 * @dev: device to open
1199 * Takes a device from down to up state. The device's private open
1200 * function is invoked and then the multicast lists are loaded. Finally
1201 * the device is moved into the up state and a %NETDEV_UP message is
1202 * sent to the netdev notifier chain.
1204 * Calling this function on an active interface is a nop. On a failure
1205 * a negative errno code is returned.
1207 int dev_open(struct net_device *dev)
1214 if (dev->flags & IFF_UP)
1220 ret = __dev_open(dev);
1225 * ... and announce new interface.
1227 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1228 call_netdevice_notifiers(NETDEV_UP, dev);
1232 EXPORT_SYMBOL(dev_open);
1234 static int __dev_close(struct net_device *dev)
1236 const struct net_device_ops *ops = dev->netdev_ops;
1242 * Tell people we are going down, so that they can
1243 * prepare to death, when device is still operating.
1245 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1247 clear_bit(__LINK_STATE_START, &dev->state);
1249 /* Synchronize to scheduled poll. We cannot touch poll list,
1250 * it can be even on different cpu. So just clear netif_running().
1252 * dev->stop() will invoke napi_disable() on all of it's
1253 * napi_struct instances on this device.
1255 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1257 dev_deactivate(dev);
1260 * Call the device specific close. This cannot fail.
1261 * Only if device is UP
1263 * We allow it to be called even after a DETACH hot-plug
1270 * Device is now down.
1273 dev->flags &= ~IFF_UP;
1278 net_dmaengine_put();
1284 * dev_close - shutdown an interface.
1285 * @dev: device to shutdown
1287 * This function moves an active device into down state. A
1288 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1289 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1292 int dev_close(struct net_device *dev)
1294 if (!(dev->flags & IFF_UP))
1300 * Tell people we are down
1302 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1303 call_netdevice_notifiers(NETDEV_DOWN, dev);
1307 EXPORT_SYMBOL(dev_close);
1311 * dev_disable_lro - disable Large Receive Offload on a device
1314 * Disable Large Receive Offload (LRO) on a net device. Must be
1315 * called under RTNL. This is needed if received packets may be
1316 * forwarded to another interface.
1318 void dev_disable_lro(struct net_device *dev)
1320 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1321 dev->ethtool_ops->set_flags) {
1322 u32 flags = dev->ethtool_ops->get_flags(dev);
1323 if (flags & ETH_FLAG_LRO) {
1324 flags &= ~ETH_FLAG_LRO;
1325 dev->ethtool_ops->set_flags(dev, flags);
1328 WARN_ON(dev->features & NETIF_F_LRO);
1330 EXPORT_SYMBOL(dev_disable_lro);
1333 static int dev_boot_phase = 1;
1336 * Device change register/unregister. These are not inline or static
1337 * as we export them to the world.
1341 * register_netdevice_notifier - register a network notifier block
1344 * Register a notifier to be called when network device events occur.
1345 * The notifier passed is linked into the kernel structures and must
1346 * not be reused until it has been unregistered. A negative errno code
1347 * is returned on a failure.
1349 * When registered all registration and up events are replayed
1350 * to the new notifier to allow device to have a race free
1351 * view of the network device list.
1354 int register_netdevice_notifier(struct notifier_block *nb)
1356 struct net_device *dev;
1357 struct net_device *last;
1362 err = raw_notifier_chain_register(&netdev_chain, nb);
1368 for_each_netdev(net, dev) {
1369 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1370 err = notifier_to_errno(err);
1374 if (!(dev->flags & IFF_UP))
1377 nb->notifier_call(nb, NETDEV_UP, dev);
1388 for_each_netdev(net, dev) {
1392 if (dev->flags & IFF_UP) {
1393 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1394 nb->notifier_call(nb, NETDEV_DOWN, dev);
1396 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1397 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1401 raw_notifier_chain_unregister(&netdev_chain, nb);
1404 EXPORT_SYMBOL(register_netdevice_notifier);
1407 * unregister_netdevice_notifier - unregister a network notifier block
1410 * Unregister a notifier previously registered by
1411 * register_netdevice_notifier(). The notifier is unlinked into the
1412 * kernel structures and may then be reused. A negative errno code
1413 * is returned on a failure.
1416 int unregister_netdevice_notifier(struct notifier_block *nb)
1421 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1425 EXPORT_SYMBOL(unregister_netdevice_notifier);
1428 * call_netdevice_notifiers - call all network notifier blocks
1429 * @val: value passed unmodified to notifier function
1430 * @dev: net_device pointer passed unmodified to notifier function
1432 * Call all network notifier blocks. Parameters and return value
1433 * are as for raw_notifier_call_chain().
1436 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1439 return raw_notifier_call_chain(&netdev_chain, val, dev);
1442 /* When > 0 there are consumers of rx skb time stamps */
1443 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1445 void net_enable_timestamp(void)
1447 atomic_inc(&netstamp_needed);
1449 EXPORT_SYMBOL(net_enable_timestamp);
1451 void net_disable_timestamp(void)
1453 atomic_dec(&netstamp_needed);
1455 EXPORT_SYMBOL(net_disable_timestamp);
1457 static inline void net_timestamp(struct sk_buff *skb)
1459 if (atomic_read(&netstamp_needed))
1460 __net_timestamp(skb);
1462 skb->tstamp.tv64 = 0;
1466 * dev_forward_skb - loopback an skb to another netif
1468 * @dev: destination network device
1469 * @skb: buffer to forward
1472 * NET_RX_SUCCESS (no congestion)
1473 * NET_RX_DROP (packet was dropped)
1475 * dev_forward_skb can be used for injecting an skb from the
1476 * start_xmit function of one device into the receive queue
1477 * of another device.
1479 * The receiving device may be in another namespace, so
1480 * we have to clear all information in the skb that could
1481 * impact namespace isolation.
1483 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1487 if (!(dev->flags & IFF_UP))
1490 if (skb->len > (dev->mtu + dev->hard_header_len))
1493 skb_set_dev(skb, dev);
1494 skb->tstamp.tv64 = 0;
1495 skb->pkt_type = PACKET_HOST;
1496 skb->protocol = eth_type_trans(skb, dev);
1497 return netif_rx(skb);
1499 EXPORT_SYMBOL_GPL(dev_forward_skb);
1502 * Support routine. Sends outgoing frames to any network
1503 * taps currently in use.
1506 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1508 struct packet_type *ptype;
1510 #ifdef CONFIG_NET_CLS_ACT
1511 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1518 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1519 /* Never send packets back to the socket
1520 * they originated from - MvS (miquels@drinkel.ow.org)
1522 if ((ptype->dev == dev || !ptype->dev) &&
1523 (ptype->af_packet_priv == NULL ||
1524 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1525 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1529 /* skb->nh should be correctly
1530 set by sender, so that the second statement is
1531 just protection against buggy protocols.
1533 skb_reset_mac_header(skb2);
1535 if (skb_network_header(skb2) < skb2->data ||
1536 skb2->network_header > skb2->tail) {
1537 if (net_ratelimit())
1538 printk(KERN_CRIT "protocol %04x is "
1540 skb2->protocol, dev->name);
1541 skb_reset_network_header(skb2);
1544 skb2->transport_header = skb2->network_header;
1545 skb2->pkt_type = PACKET_OUTGOING;
1546 ptype->func(skb2, skb->dev, ptype, skb->dev);
1553 static inline void __netif_reschedule(struct Qdisc *q)
1555 struct softnet_data *sd;
1556 unsigned long flags;
1558 local_irq_save(flags);
1559 sd = &__get_cpu_var(softnet_data);
1560 q->next_sched = NULL;
1561 *sd->output_queue_tailp = q;
1562 sd->output_queue_tailp = &q->next_sched;
1563 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1564 local_irq_restore(flags);
1567 void __netif_schedule(struct Qdisc *q)
1569 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1570 __netif_reschedule(q);
1572 EXPORT_SYMBOL(__netif_schedule);
1574 void dev_kfree_skb_irq(struct sk_buff *skb)
1576 if (atomic_dec_and_test(&skb->users)) {
1577 struct softnet_data *sd;
1578 unsigned long flags;
1580 local_irq_save(flags);
1581 sd = &__get_cpu_var(softnet_data);
1582 skb->next = sd->completion_queue;
1583 sd->completion_queue = skb;
1584 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1585 local_irq_restore(flags);
1588 EXPORT_SYMBOL(dev_kfree_skb_irq);
1590 void dev_kfree_skb_any(struct sk_buff *skb)
1592 if (in_irq() || irqs_disabled())
1593 dev_kfree_skb_irq(skb);
1597 EXPORT_SYMBOL(dev_kfree_skb_any);
1601 * netif_device_detach - mark device as removed
1602 * @dev: network device
1604 * Mark device as removed from system and therefore no longer available.
1606 void netif_device_detach(struct net_device *dev)
1608 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1609 netif_running(dev)) {
1610 netif_tx_stop_all_queues(dev);
1613 EXPORT_SYMBOL(netif_device_detach);
1616 * netif_device_attach - mark device as attached
1617 * @dev: network device
1619 * Mark device as attached from system and restart if needed.
1621 void netif_device_attach(struct net_device *dev)
1623 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1624 netif_running(dev)) {
1625 netif_tx_wake_all_queues(dev);
1626 __netdev_watchdog_up(dev);
1629 EXPORT_SYMBOL(netif_device_attach);
1631 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1633 return ((features & NETIF_F_GEN_CSUM) ||
1634 ((features & NETIF_F_IP_CSUM) &&
1635 protocol == htons(ETH_P_IP)) ||
1636 ((features & NETIF_F_IPV6_CSUM) &&
1637 protocol == htons(ETH_P_IPV6)) ||
1638 ((features & NETIF_F_FCOE_CRC) &&
1639 protocol == htons(ETH_P_FCOE)));
1642 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1644 if (can_checksum_protocol(dev->features, skb->protocol))
1647 if (skb->protocol == htons(ETH_P_8021Q)) {
1648 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1649 if (can_checksum_protocol(dev->features & dev->vlan_features,
1650 veh->h_vlan_encapsulated_proto))
1658 * skb_dev_set -- assign a new device to a buffer
1659 * @skb: buffer for the new device
1660 * @dev: network device
1662 * If an skb is owned by a device already, we have to reset
1663 * all data private to the namespace a device belongs to
1664 * before assigning it a new device.
1666 #ifdef CONFIG_NET_NS
1667 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1670 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1673 skb_init_secmark(skb);
1677 skb->ipvs_property = 0;
1678 #ifdef CONFIG_NET_SCHED
1684 EXPORT_SYMBOL(skb_set_dev);
1685 #endif /* CONFIG_NET_NS */
1688 * Invalidate hardware checksum when packet is to be mangled, and
1689 * complete checksum manually on outgoing path.
1691 int skb_checksum_help(struct sk_buff *skb)
1694 int ret = 0, offset;
1696 if (skb->ip_summed == CHECKSUM_COMPLETE)
1697 goto out_set_summed;
1699 if (unlikely(skb_shinfo(skb)->gso_size)) {
1700 /* Let GSO fix up the checksum. */
1701 goto out_set_summed;
1704 offset = skb->csum_start - skb_headroom(skb);
1705 BUG_ON(offset >= skb_headlen(skb));
1706 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1708 offset += skb->csum_offset;
1709 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1711 if (skb_cloned(skb) &&
1712 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1713 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1718 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1720 skb->ip_summed = CHECKSUM_NONE;
1724 EXPORT_SYMBOL(skb_checksum_help);
1727 * skb_gso_segment - Perform segmentation on skb.
1728 * @skb: buffer to segment
1729 * @features: features for the output path (see dev->features)
1731 * This function segments the given skb and returns a list of segments.
1733 * It may return NULL if the skb requires no segmentation. This is
1734 * only possible when GSO is used for verifying header integrity.
1736 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1738 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1739 struct packet_type *ptype;
1740 __be16 type = skb->protocol;
1743 skb_reset_mac_header(skb);
1744 skb->mac_len = skb->network_header - skb->mac_header;
1745 __skb_pull(skb, skb->mac_len);
1747 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1748 struct net_device *dev = skb->dev;
1749 struct ethtool_drvinfo info = {};
1751 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1752 dev->ethtool_ops->get_drvinfo(dev, &info);
1754 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1756 info.driver, dev ? dev->features : 0L,
1757 skb->sk ? skb->sk->sk_route_caps : 0L,
1758 skb->len, skb->data_len, skb->ip_summed);
1760 if (skb_header_cloned(skb) &&
1761 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1762 return ERR_PTR(err);
1766 list_for_each_entry_rcu(ptype,
1767 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1768 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1769 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1770 err = ptype->gso_send_check(skb);
1771 segs = ERR_PTR(err);
1772 if (err || skb_gso_ok(skb, features))
1774 __skb_push(skb, (skb->data -
1775 skb_network_header(skb)));
1777 segs = ptype->gso_segment(skb, features);
1783 __skb_push(skb, skb->data - skb_mac_header(skb));
1787 EXPORT_SYMBOL(skb_gso_segment);
1789 /* Take action when hardware reception checksum errors are detected. */
1791 void netdev_rx_csum_fault(struct net_device *dev)
1793 if (net_ratelimit()) {
1794 printk(KERN_ERR "%s: hw csum failure.\n",
1795 dev ? dev->name : "<unknown>");
1799 EXPORT_SYMBOL(netdev_rx_csum_fault);
1802 /* Actually, we should eliminate this check as soon as we know, that:
1803 * 1. IOMMU is present and allows to map all the memory.
1804 * 2. No high memory really exists on this machine.
1807 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1809 #ifdef CONFIG_HIGHMEM
1811 if (!(dev->features & NETIF_F_HIGHDMA)) {
1812 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1813 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1817 if (PCI_DMA_BUS_IS_PHYS) {
1818 struct device *pdev = dev->dev.parent;
1822 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1823 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1824 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1833 void (*destructor)(struct sk_buff *skb);
1836 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1838 static void dev_gso_skb_destructor(struct sk_buff *skb)
1840 struct dev_gso_cb *cb;
1843 struct sk_buff *nskb = skb->next;
1845 skb->next = nskb->next;
1848 } while (skb->next);
1850 cb = DEV_GSO_CB(skb);
1852 cb->destructor(skb);
1856 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1857 * @skb: buffer to segment
1859 * This function segments the given skb and stores the list of segments
1862 static int dev_gso_segment(struct sk_buff *skb)
1864 struct net_device *dev = skb->dev;
1865 struct sk_buff *segs;
1866 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1869 segs = skb_gso_segment(skb, features);
1871 /* Verifying header integrity only. */
1876 return PTR_ERR(segs);
1879 DEV_GSO_CB(skb)->destructor = skb->destructor;
1880 skb->destructor = dev_gso_skb_destructor;
1886 * Try to orphan skb early, right before transmission by the device.
1887 * We cannot orphan skb if tx timestamp is requested, since
1888 * drivers need to call skb_tstamp_tx() to send the timestamp.
1890 static inline void skb_orphan_try(struct sk_buff *skb)
1892 if (!skb_tx(skb)->flags)
1896 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1897 struct netdev_queue *txq)
1899 const struct net_device_ops *ops = dev->netdev_ops;
1900 int rc = NETDEV_TX_OK;
1902 if (likely(!skb->next)) {
1903 if (!list_empty(&ptype_all))
1904 dev_queue_xmit_nit(skb, dev);
1907 * If device doesnt need skb->dst, release it right now while
1908 * its hot in this cpu cache
1910 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1913 skb_orphan_try(skb);
1915 if (netif_needs_gso(dev, skb)) {
1916 if (unlikely(dev_gso_segment(skb)))
1922 rc = ops->ndo_start_xmit(skb, dev);
1923 if (rc == NETDEV_TX_OK)
1924 txq_trans_update(txq);
1930 struct sk_buff *nskb = skb->next;
1932 skb->next = nskb->next;
1936 * If device doesnt need nskb->dst, release it right now while
1937 * its hot in this cpu cache
1939 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1942 rc = ops->ndo_start_xmit(nskb, dev);
1943 if (unlikely(rc != NETDEV_TX_OK)) {
1944 if (rc & ~NETDEV_TX_MASK)
1945 goto out_kfree_gso_skb;
1946 nskb->next = skb->next;
1950 txq_trans_update(txq);
1951 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1952 return NETDEV_TX_BUSY;
1953 } while (skb->next);
1956 if (likely(skb->next == NULL))
1957 skb->destructor = DEV_GSO_CB(skb)->destructor;
1963 static u32 hashrnd __read_mostly;
1965 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1969 if (skb_rx_queue_recorded(skb)) {
1970 hash = skb_get_rx_queue(skb);
1971 while (unlikely(hash >= dev->real_num_tx_queues))
1972 hash -= dev->real_num_tx_queues;
1976 if (skb->sk && skb->sk->sk_hash)
1977 hash = skb->sk->sk_hash;
1979 hash = (__force u16) skb->protocol;
1981 hash = jhash_1word(hash, hashrnd);
1983 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1985 EXPORT_SYMBOL(skb_tx_hash);
1987 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
1989 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
1990 if (net_ratelimit()) {
1991 pr_warning("%s selects TX queue %d, but "
1992 "real number of TX queues is %d\n",
1993 dev->name, queue_index, dev->real_num_tx_queues);
2000 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2001 struct sk_buff *skb)
2004 struct sock *sk = skb->sk;
2006 if (sk_tx_queue_recorded(sk)) {
2007 queue_index = sk_tx_queue_get(sk);
2009 const struct net_device_ops *ops = dev->netdev_ops;
2011 if (ops->ndo_select_queue) {
2012 queue_index = ops->ndo_select_queue(dev, skb);
2013 queue_index = dev_cap_txqueue(dev, queue_index);
2016 if (dev->real_num_tx_queues > 1)
2017 queue_index = skb_tx_hash(dev, skb);
2020 struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
2022 if (dst && skb_dst(skb) == dst)
2023 sk_tx_queue_set(sk, queue_index);
2028 skb_set_queue_mapping(skb, queue_index);
2029 return netdev_get_tx_queue(dev, queue_index);
2032 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2033 struct net_device *dev,
2034 struct netdev_queue *txq)
2036 spinlock_t *root_lock = qdisc_lock(q);
2039 spin_lock(root_lock);
2040 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2043 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2044 !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
2046 * This is a work-conserving queue; there are no old skbs
2047 * waiting to be sent out; and the qdisc is not running -
2048 * xmit the skb directly.
2050 __qdisc_update_bstats(q, skb->len);
2051 if (sch_direct_xmit(skb, q, dev, txq, root_lock))
2054 clear_bit(__QDISC_STATE_RUNNING, &q->state);
2056 rc = NET_XMIT_SUCCESS;
2058 rc = qdisc_enqueue_root(skb, q);
2061 spin_unlock(root_lock);
2067 * Returns true if either:
2068 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2069 * 2. skb is fragmented and the device does not support SG, or if
2070 * at least one of fragments is in highmem and device does not
2071 * support DMA from it.
2073 static inline int skb_needs_linearize(struct sk_buff *skb,
2074 struct net_device *dev)
2076 return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
2077 (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
2078 illegal_highdma(dev, skb)));
2082 * dev_queue_xmit - transmit a buffer
2083 * @skb: buffer to transmit
2085 * Queue a buffer for transmission to a network device. The caller must
2086 * have set the device and priority and built the buffer before calling
2087 * this function. The function can be called from an interrupt.
2089 * A negative errno code is returned on a failure. A success does not
2090 * guarantee the frame will be transmitted as it may be dropped due
2091 * to congestion or traffic shaping.
2093 * -----------------------------------------------------------------------------------
2094 * I notice this method can also return errors from the queue disciplines,
2095 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2098 * Regardless of the return value, the skb is consumed, so it is currently
2099 * difficult to retry a send to this method. (You can bump the ref count
2100 * before sending to hold a reference for retry if you are careful.)
2102 * When calling this method, interrupts MUST be enabled. This is because
2103 * the BH enable code must have IRQs enabled so that it will not deadlock.
2106 int dev_queue_xmit(struct sk_buff *skb)
2108 struct net_device *dev = skb->dev;
2109 struct netdev_queue *txq;
2113 /* GSO will handle the following emulations directly. */
2114 if (netif_needs_gso(dev, skb))
2117 /* Convert a paged skb to linear, if required */
2118 if (skb_needs_linearize(skb, dev) && __skb_linearize(skb))
2121 /* If packet is not checksummed and device does not support
2122 * checksumming for this protocol, complete checksumming here.
2124 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2125 skb_set_transport_header(skb, skb->csum_start -
2127 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
2132 /* Disable soft irqs for various locks below. Also
2133 * stops preemption for RCU.
2137 txq = dev_pick_tx(dev, skb);
2138 q = rcu_dereference_bh(txq->qdisc);
2140 #ifdef CONFIG_NET_CLS_ACT
2141 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2144 rc = __dev_xmit_skb(skb, q, dev, txq);
2148 /* The device has no queue. Common case for software devices:
2149 loopback, all the sorts of tunnels...
2151 Really, it is unlikely that netif_tx_lock protection is necessary
2152 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2154 However, it is possible, that they rely on protection
2157 Check this and shot the lock. It is not prone from deadlocks.
2158 Either shot noqueue qdisc, it is even simpler 8)
2160 if (dev->flags & IFF_UP) {
2161 int cpu = smp_processor_id(); /* ok because BHs are off */
2163 if (txq->xmit_lock_owner != cpu) {
2165 HARD_TX_LOCK(dev, txq, cpu);
2167 if (!netif_tx_queue_stopped(txq)) {
2168 rc = dev_hard_start_xmit(skb, dev, txq);
2169 if (dev_xmit_complete(rc)) {
2170 HARD_TX_UNLOCK(dev, txq);
2174 HARD_TX_UNLOCK(dev, txq);
2175 if (net_ratelimit())
2176 printk(KERN_CRIT "Virtual device %s asks to "
2177 "queue packet!\n", dev->name);
2179 /* Recursion is detected! It is possible,
2181 if (net_ratelimit())
2182 printk(KERN_CRIT "Dead loop on virtual device "
2183 "%s, fix it urgently!\n", dev->name);
2188 rcu_read_unlock_bh();
2194 rcu_read_unlock_bh();
2197 EXPORT_SYMBOL(dev_queue_xmit);
2200 /*=======================================================================
2202 =======================================================================*/
2204 int netdev_max_backlog __read_mostly = 1000;
2205 int netdev_budget __read_mostly = 300;
2206 int weight_p __read_mostly = 64; /* old backlog weight */
2208 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
2212 /* One global table that all flow-based protocols share. */
2213 struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
2214 EXPORT_SYMBOL(rps_sock_flow_table);
2217 * get_rps_cpu is called from netif_receive_skb and returns the target
2218 * CPU from the RPS map of the receiving queue for a given skb.
2219 * rcu_read_lock must be held on entry.
2221 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2222 struct rps_dev_flow **rflowp)
2224 struct ipv6hdr *ip6;
2226 struct netdev_rx_queue *rxqueue;
2227 struct rps_map *map;
2228 struct rps_dev_flow_table *flow_table;
2229 struct rps_sock_flow_table *sock_flow_table;
2233 u32 addr1, addr2, ihl;
2239 if (skb_rx_queue_recorded(skb)) {
2240 u16 index = skb_get_rx_queue(skb);
2241 if (unlikely(index >= dev->num_rx_queues)) {
2242 if (net_ratelimit()) {
2243 pr_warning("%s received packet on queue "
2244 "%u, but number of RX queues is %u\n",
2245 dev->name, index, dev->num_rx_queues);
2249 rxqueue = dev->_rx + index;
2253 if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
2257 goto got_hash; /* Skip hash computation on packet header */
2259 switch (skb->protocol) {
2260 case __constant_htons(ETH_P_IP):
2261 if (!pskb_may_pull(skb, sizeof(*ip)))
2264 ip = (struct iphdr *) skb->data;
2265 ip_proto = ip->protocol;
2266 addr1 = (__force u32) ip->saddr;
2267 addr2 = (__force u32) ip->daddr;
2270 case __constant_htons(ETH_P_IPV6):
2271 if (!pskb_may_pull(skb, sizeof(*ip6)))
2274 ip6 = (struct ipv6hdr *) skb->data;
2275 ip_proto = ip6->nexthdr;
2276 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2277 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2290 case IPPROTO_UDPLITE:
2291 if (pskb_may_pull(skb, (ihl * 4) + 4)) {
2292 ports.v32 = * (__force u32 *) (skb->data + (ihl * 4));
2293 if (ports.v16[1] < ports.v16[0])
2294 swap(ports.v16[0], ports.v16[1]);
2302 /* get a consistent hash (same value on both flow directions) */
2305 skb->rxhash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2310 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2311 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2312 if (flow_table && sock_flow_table) {
2314 struct rps_dev_flow *rflow;
2316 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2319 next_cpu = sock_flow_table->ents[skb->rxhash &
2320 sock_flow_table->mask];
2323 * If the desired CPU (where last recvmsg was done) is
2324 * different from current CPU (one in the rx-queue flow
2325 * table entry), switch if one of the following holds:
2326 * - Current CPU is unset (equal to RPS_NO_CPU).
2327 * - Current CPU is offline.
2328 * - The current CPU's queue tail has advanced beyond the
2329 * last packet that was enqueued using this table entry.
2330 * This guarantees that all previous packets for the flow
2331 * have been dequeued, thus preserving in order delivery.
2333 if (unlikely(tcpu != next_cpu) &&
2334 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2335 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2336 rflow->last_qtail)) >= 0)) {
2337 tcpu = rflow->cpu = next_cpu;
2338 if (tcpu != RPS_NO_CPU)
2339 rflow->last_qtail = per_cpu(softnet_data,
2340 tcpu).input_queue_head;
2342 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2349 map = rcu_dereference(rxqueue->rps_map);
2351 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2353 if (cpu_online(tcpu)) {
2363 /* Called from hardirq (IPI) context */
2364 static void rps_trigger_softirq(void *data)
2366 struct softnet_data *sd = data;
2368 __napi_schedule(&sd->backlog);
2369 __get_cpu_var(netdev_rx_stat).received_rps++;
2372 #endif /* CONFIG_RPS */
2375 * Check if this softnet_data structure is another cpu one
2376 * If yes, queue it to our IPI list and return 1
2379 static int rps_ipi_queued(struct softnet_data *sd)
2382 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2385 sd->rps_ipi_next = mysd->rps_ipi_list;
2386 mysd->rps_ipi_list = sd;
2388 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2391 #endif /* CONFIG_RPS */
2396 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2397 * queue (may be a remote CPU queue).
2399 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2400 unsigned int *qtail)
2402 struct softnet_data *sd;
2403 unsigned long flags;
2405 sd = &per_cpu(softnet_data, cpu);
2407 local_irq_save(flags);
2408 __get_cpu_var(netdev_rx_stat).total++;
2411 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2412 if (skb_queue_len(&sd->input_pkt_queue)) {
2414 __skb_queue_tail(&sd->input_pkt_queue, skb);
2416 *qtail = sd->input_queue_head +
2417 skb_queue_len(&sd->input_pkt_queue);
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;
2534 sd->output_queue_tailp = &sd->output_queue;
2538 struct Qdisc *q = head;
2539 spinlock_t *root_lock;
2541 head = head->next_sched;
2543 root_lock = qdisc_lock(q);
2544 if (spin_trylock(root_lock)) {
2545 smp_mb__before_clear_bit();
2546 clear_bit(__QDISC_STATE_SCHED,
2549 spin_unlock(root_lock);
2551 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2553 __netif_reschedule(q);
2555 smp_mb__before_clear_bit();
2556 clear_bit(__QDISC_STATE_SCHED,
2564 static inline int deliver_skb(struct sk_buff *skb,
2565 struct packet_type *pt_prev,
2566 struct net_device *orig_dev)
2568 atomic_inc(&skb->users);
2569 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2572 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2574 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
2575 /* This hook is defined here for ATM LANE */
2576 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2577 unsigned char *addr) __read_mostly;
2578 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2582 * If bridge module is loaded call bridging hook.
2583 * returns NULL if packet was consumed.
2585 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2586 struct sk_buff *skb) __read_mostly;
2587 EXPORT_SYMBOL_GPL(br_handle_frame_hook);
2589 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2590 struct packet_type **pt_prev, int *ret,
2591 struct net_device *orig_dev)
2593 struct net_bridge_port *port;
2595 if (skb->pkt_type == PACKET_LOOPBACK ||
2596 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2600 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2604 return br_handle_frame_hook(port, skb);
2607 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2610 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2611 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2612 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2614 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2615 struct packet_type **pt_prev,
2617 struct net_device *orig_dev)
2619 if (skb->dev->macvlan_port == NULL)
2623 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2626 return macvlan_handle_frame_hook(skb);
2629 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2632 #ifdef CONFIG_NET_CLS_ACT
2633 /* TODO: Maybe we should just force sch_ingress to be compiled in
2634 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2635 * a compare and 2 stores extra right now if we dont have it on
2636 * but have CONFIG_NET_CLS_ACT
2637 * NOTE: This doesnt stop any functionality; if you dont have
2638 * the ingress scheduler, you just cant add policies on ingress.
2641 static int ing_filter(struct sk_buff *skb)
2643 struct net_device *dev = skb->dev;
2644 u32 ttl = G_TC_RTTL(skb->tc_verd);
2645 struct netdev_queue *rxq;
2646 int result = TC_ACT_OK;
2649 if (MAX_RED_LOOP < ttl++) {
2651 "Redir loop detected Dropping packet (%d->%d)\n",
2652 skb->skb_iif, dev->ifindex);
2656 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2657 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2659 rxq = &dev->rx_queue;
2662 if (q != &noop_qdisc) {
2663 spin_lock(qdisc_lock(q));
2664 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2665 result = qdisc_enqueue_root(skb, q);
2666 spin_unlock(qdisc_lock(q));
2672 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2673 struct packet_type **pt_prev,
2674 int *ret, struct net_device *orig_dev)
2676 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2680 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2683 /* Huh? Why does turning on AF_PACKET affect this? */
2684 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2687 switch (ing_filter(skb)) {
2701 * netif_nit_deliver - deliver received packets to network taps
2704 * This function is used to deliver incoming packets to network
2705 * taps. It should be used when the normal netif_receive_skb path
2706 * is bypassed, for example because of VLAN acceleration.
2708 void netif_nit_deliver(struct sk_buff *skb)
2710 struct packet_type *ptype;
2712 if (list_empty(&ptype_all))
2715 skb_reset_network_header(skb);
2716 skb_reset_transport_header(skb);
2717 skb->mac_len = skb->network_header - skb->mac_header;
2720 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2721 if (!ptype->dev || ptype->dev == skb->dev)
2722 deliver_skb(skb, ptype, skb->dev);
2727 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2728 struct net_device *master)
2730 if (skb->pkt_type == PACKET_HOST) {
2731 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2733 memcpy(dest, master->dev_addr, ETH_ALEN);
2737 /* On bonding slaves other than the currently active slave, suppress
2738 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2739 * ARP on active-backup slaves with arp_validate enabled.
2741 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2743 struct net_device *dev = skb->dev;
2745 if (master->priv_flags & IFF_MASTER_ARPMON)
2746 dev->last_rx = jiffies;
2748 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
2749 /* Do address unmangle. The local destination address
2750 * will be always the one master has. Provides the right
2751 * functionality in a bridge.
2753 skb_bond_set_mac_by_master(skb, master);
2756 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2757 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2758 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2761 if (master->priv_flags & IFF_MASTER_ALB) {
2762 if (skb->pkt_type != PACKET_BROADCAST &&
2763 skb->pkt_type != PACKET_MULTICAST)
2766 if (master->priv_flags & IFF_MASTER_8023AD &&
2767 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2774 EXPORT_SYMBOL(__skb_bond_should_drop);
2776 static int __netif_receive_skb(struct sk_buff *skb)
2778 struct packet_type *ptype, *pt_prev;
2779 struct net_device *orig_dev;
2780 struct net_device *master;
2781 struct net_device *null_or_orig;
2782 struct net_device *null_or_bond;
2783 int ret = NET_RX_DROP;
2786 if (!skb->tstamp.tv64)
2789 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2790 return NET_RX_SUCCESS;
2792 /* if we've gotten here through NAPI, check netpoll */
2793 if (netpoll_receive_skb(skb))
2797 skb->skb_iif = skb->dev->ifindex;
2799 null_or_orig = NULL;
2800 orig_dev = skb->dev;
2801 master = ACCESS_ONCE(orig_dev->master);
2803 if (skb_bond_should_drop(skb, master))
2804 null_or_orig = orig_dev; /* deliver only exact match */
2809 __get_cpu_var(netdev_rx_stat).total++;
2811 skb_reset_network_header(skb);
2812 skb_reset_transport_header(skb);
2813 skb->mac_len = skb->network_header - skb->mac_header;
2819 #ifdef CONFIG_NET_CLS_ACT
2820 if (skb->tc_verd & TC_NCLS) {
2821 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2826 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2827 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2828 ptype->dev == orig_dev) {
2830 ret = deliver_skb(skb, pt_prev, orig_dev);
2835 #ifdef CONFIG_NET_CLS_ACT
2836 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2842 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2845 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2850 * Make sure frames received on VLAN interfaces stacked on
2851 * bonding interfaces still make their way to any base bonding
2852 * device that may have registered for a specific ptype. The
2853 * handler may have to adjust skb->dev and orig_dev.
2855 null_or_bond = NULL;
2856 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2857 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2858 null_or_bond = vlan_dev_real_dev(skb->dev);
2861 type = skb->protocol;
2862 list_for_each_entry_rcu(ptype,
2863 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2864 if (ptype->type == type && (ptype->dev == null_or_orig ||
2865 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2866 ptype->dev == null_or_bond)) {
2868 ret = deliver_skb(skb, pt_prev, orig_dev);
2874 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2877 /* Jamal, now you will not able to escape explaining
2878 * me how you were going to use this. :-)
2889 * netif_receive_skb - process receive buffer from network
2890 * @skb: buffer to process
2892 * netif_receive_skb() is the main receive data processing function.
2893 * It always succeeds. The buffer may be dropped during processing
2894 * for congestion control or by the protocol layers.
2896 * This function may only be called from softirq context and interrupts
2897 * should be enabled.
2899 * Return values (usually ignored):
2900 * NET_RX_SUCCESS: no congestion
2901 * NET_RX_DROP: packet was dropped
2903 int netif_receive_skb(struct sk_buff *skb)
2906 struct rps_dev_flow voidflow, *rflow = &voidflow;
2911 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2914 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2918 ret = __netif_receive_skb(skb);
2923 return __netif_receive_skb(skb);
2926 EXPORT_SYMBOL(netif_receive_skb);
2928 /* Network device is going away, flush any packets still pending
2929 * Called with irqs disabled.
2931 static void flush_backlog(void *arg)
2933 struct net_device *dev = arg;
2934 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2935 struct sk_buff *skb, *tmp;
2938 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
2939 if (skb->dev == dev) {
2940 __skb_unlink(skb, &sd->input_pkt_queue);
2942 input_queue_head_add(sd, 1);
2947 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
2948 if (skb->dev == dev) {
2949 __skb_unlink(skb, &sd->process_queue);
2955 static int napi_gro_complete(struct sk_buff *skb)
2957 struct packet_type *ptype;
2958 __be16 type = skb->protocol;
2959 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2962 if (NAPI_GRO_CB(skb)->count == 1) {
2963 skb_shinfo(skb)->gso_size = 0;
2968 list_for_each_entry_rcu(ptype, head, list) {
2969 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2972 err = ptype->gro_complete(skb);
2978 WARN_ON(&ptype->list == head);
2980 return NET_RX_SUCCESS;
2984 return netif_receive_skb(skb);
2987 static void napi_gro_flush(struct napi_struct *napi)
2989 struct sk_buff *skb, *next;
2991 for (skb = napi->gro_list; skb; skb = next) {
2994 napi_gro_complete(skb);
2997 napi->gro_count = 0;
2998 napi->gro_list = NULL;
3001 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3003 struct sk_buff **pp = NULL;
3004 struct packet_type *ptype;
3005 __be16 type = skb->protocol;
3006 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3009 enum gro_result ret;
3011 if (!(skb->dev->features & NETIF_F_GRO))
3014 if (skb_is_gso(skb) || skb_has_frags(skb))
3018 list_for_each_entry_rcu(ptype, head, list) {
3019 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3022 skb_set_network_header(skb, skb_gro_offset(skb));
3023 mac_len = skb->network_header - skb->mac_header;
3024 skb->mac_len = mac_len;
3025 NAPI_GRO_CB(skb)->same_flow = 0;
3026 NAPI_GRO_CB(skb)->flush = 0;
3027 NAPI_GRO_CB(skb)->free = 0;
3029 pp = ptype->gro_receive(&napi->gro_list, skb);
3034 if (&ptype->list == head)
3037 same_flow = NAPI_GRO_CB(skb)->same_flow;
3038 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3041 struct sk_buff *nskb = *pp;
3045 napi_gro_complete(nskb);
3052 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3056 NAPI_GRO_CB(skb)->count = 1;
3057 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3058 skb->next = napi->gro_list;
3059 napi->gro_list = skb;
3063 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3064 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3066 BUG_ON(skb->end - skb->tail < grow);
3068 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3071 skb->data_len -= grow;
3073 skb_shinfo(skb)->frags[0].page_offset += grow;
3074 skb_shinfo(skb)->frags[0].size -= grow;
3076 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3077 put_page(skb_shinfo(skb)->frags[0].page);
3078 memmove(skb_shinfo(skb)->frags,
3079 skb_shinfo(skb)->frags + 1,
3080 --skb_shinfo(skb)->nr_frags);
3091 EXPORT_SYMBOL(dev_gro_receive);
3094 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3098 if (netpoll_rx_on(skb))
3101 for (p = napi->gro_list; p; p = p->next) {
3102 NAPI_GRO_CB(p)->same_flow =
3103 (p->dev == skb->dev) &&
3104 !compare_ether_header(skb_mac_header(p),
3105 skb_gro_mac_header(skb));
3106 NAPI_GRO_CB(p)->flush = 0;
3109 return dev_gro_receive(napi, skb);
3112 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3116 if (netif_receive_skb(skb))
3121 case GRO_MERGED_FREE:
3132 EXPORT_SYMBOL(napi_skb_finish);
3134 void skb_gro_reset_offset(struct sk_buff *skb)
3136 NAPI_GRO_CB(skb)->data_offset = 0;
3137 NAPI_GRO_CB(skb)->frag0 = NULL;
3138 NAPI_GRO_CB(skb)->frag0_len = 0;
3140 if (skb->mac_header == skb->tail &&
3141 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3142 NAPI_GRO_CB(skb)->frag0 =
3143 page_address(skb_shinfo(skb)->frags[0].page) +
3144 skb_shinfo(skb)->frags[0].page_offset;
3145 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3148 EXPORT_SYMBOL(skb_gro_reset_offset);
3150 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3152 skb_gro_reset_offset(skb);
3154 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3156 EXPORT_SYMBOL(napi_gro_receive);
3158 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3160 __skb_pull(skb, skb_headlen(skb));
3161 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3165 EXPORT_SYMBOL(napi_reuse_skb);
3167 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3169 struct sk_buff *skb = napi->skb;
3172 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3178 EXPORT_SYMBOL(napi_get_frags);
3180 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3186 skb->protocol = eth_type_trans(skb, skb->dev);
3188 if (ret == GRO_HELD)
3189 skb_gro_pull(skb, -ETH_HLEN);
3190 else if (netif_receive_skb(skb))
3195 case GRO_MERGED_FREE:
3196 napi_reuse_skb(napi, skb);
3205 EXPORT_SYMBOL(napi_frags_finish);
3207 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3209 struct sk_buff *skb = napi->skb;
3216 skb_reset_mac_header(skb);
3217 skb_gro_reset_offset(skb);
3219 off = skb_gro_offset(skb);
3220 hlen = off + sizeof(*eth);
3221 eth = skb_gro_header_fast(skb, off);
3222 if (skb_gro_header_hard(skb, hlen)) {
3223 eth = skb_gro_header_slow(skb, hlen, off);
3224 if (unlikely(!eth)) {
3225 napi_reuse_skb(napi, skb);
3231 skb_gro_pull(skb, sizeof(*eth));
3234 * This works because the only protocols we care about don't require
3235 * special handling. We'll fix it up properly at the end.
3237 skb->protocol = eth->h_proto;
3242 EXPORT_SYMBOL(napi_frags_skb);
3244 gro_result_t napi_gro_frags(struct napi_struct *napi)
3246 struct sk_buff *skb = napi_frags_skb(napi);
3251 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3253 EXPORT_SYMBOL(napi_gro_frags);
3256 * net_rps_action sends any pending IPI's for rps.
3257 * Note: called with local irq disabled, but exits with local irq enabled.
3259 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3262 struct softnet_data *remsd = sd->rps_ipi_list;
3265 sd->rps_ipi_list = NULL;
3269 /* Send pending IPI's to kick RPS processing on remote cpus. */
3271 struct softnet_data *next = remsd->rps_ipi_next;
3273 if (cpu_online(remsd->cpu))
3274 __smp_call_function_single(remsd->cpu,
3283 static int process_backlog(struct napi_struct *napi, int quota)
3286 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3289 /* Check if we have pending ipi, its better to send them now,
3290 * not waiting net_rx_action() end.
3292 if (sd->rps_ipi_list) {
3293 local_irq_disable();
3294 net_rps_action_and_irq_enable(sd);
3297 napi->weight = weight_p;
3298 local_irq_disable();
3299 while (work < quota) {
3300 struct sk_buff *skb;
3303 while ((skb = __skb_dequeue(&sd->process_queue))) {
3305 __netif_receive_skb(skb);
3306 if (++work >= quota)
3308 local_irq_disable();
3312 qlen = skb_queue_len(&sd->input_pkt_queue);
3314 input_queue_head_add(sd, qlen);
3315 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3316 &sd->process_queue);
3318 if (qlen < quota - work) {
3319 __napi_complete(napi);
3320 quota = work + qlen;
3330 * __napi_schedule - schedule for receive
3331 * @n: entry to schedule
3333 * The entry's receive function will be scheduled to run
3335 void __napi_schedule(struct napi_struct *n)
3337 unsigned long flags;
3339 local_irq_save(flags);
3340 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
3341 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3342 local_irq_restore(flags);
3344 EXPORT_SYMBOL(__napi_schedule);
3346 void __napi_complete(struct napi_struct *n)
3348 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3349 BUG_ON(n->gro_list);
3351 list_del(&n->poll_list);
3352 smp_mb__before_clear_bit();
3353 clear_bit(NAPI_STATE_SCHED, &n->state);
3355 EXPORT_SYMBOL(__napi_complete);
3357 void napi_complete(struct napi_struct *n)
3359 unsigned long flags;
3362 * don't let napi dequeue from the cpu poll list
3363 * just in case its running on a different cpu
3365 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3369 local_irq_save(flags);
3371 local_irq_restore(flags);
3373 EXPORT_SYMBOL(napi_complete);
3375 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3376 int (*poll)(struct napi_struct *, int), int weight)
3378 INIT_LIST_HEAD(&napi->poll_list);
3379 napi->gro_count = 0;
3380 napi->gro_list = NULL;
3383 napi->weight = weight;
3384 list_add(&napi->dev_list, &dev->napi_list);
3386 #ifdef CONFIG_NETPOLL
3387 spin_lock_init(&napi->poll_lock);
3388 napi->poll_owner = -1;
3390 set_bit(NAPI_STATE_SCHED, &napi->state);
3392 EXPORT_SYMBOL(netif_napi_add);
3394 void netif_napi_del(struct napi_struct *napi)
3396 struct sk_buff *skb, *next;
3398 list_del_init(&napi->dev_list);
3399 napi_free_frags(napi);
3401 for (skb = napi->gro_list; skb; skb = next) {
3407 napi->gro_list = NULL;
3408 napi->gro_count = 0;
3410 EXPORT_SYMBOL(netif_napi_del);
3412 static void net_rx_action(struct softirq_action *h)
3414 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3415 unsigned long time_limit = jiffies + 2;
3416 int budget = netdev_budget;
3419 local_irq_disable();
3421 while (!list_empty(&sd->poll_list)) {
3422 struct napi_struct *n;
3425 /* If softirq window is exhuasted then punt.
3426 * Allow this to run for 2 jiffies since which will allow
3427 * an average latency of 1.5/HZ.
3429 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3434 /* Even though interrupts have been re-enabled, this
3435 * access is safe because interrupts can only add new
3436 * entries to the tail of this list, and only ->poll()
3437 * calls can remove this head entry from the list.
3439 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3441 have = netpoll_poll_lock(n);
3445 /* This NAPI_STATE_SCHED test is for avoiding a race
3446 * with netpoll's poll_napi(). Only the entity which
3447 * obtains the lock and sees NAPI_STATE_SCHED set will
3448 * actually make the ->poll() call. Therefore we avoid
3449 * accidently calling ->poll() when NAPI is not scheduled.
3452 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3453 work = n->poll(n, weight);
3457 WARN_ON_ONCE(work > weight);
3461 local_irq_disable();
3463 /* Drivers must not modify the NAPI state if they
3464 * consume the entire weight. In such cases this code
3465 * still "owns" the NAPI instance and therefore can
3466 * move the instance around on the list at-will.
3468 if (unlikely(work == weight)) {
3469 if (unlikely(napi_disable_pending(n))) {
3472 local_irq_disable();
3474 list_move_tail(&n->poll_list, &sd->poll_list);
3477 netpoll_poll_unlock(have);
3480 net_rps_action_and_irq_enable(sd);
3482 #ifdef CONFIG_NET_DMA
3484 * There may not be any more sk_buffs coming right now, so push
3485 * any pending DMA copies to hardware
3487 dma_issue_pending_all();
3493 __get_cpu_var(netdev_rx_stat).time_squeeze++;
3494 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3498 static gifconf_func_t *gifconf_list[NPROTO];
3501 * register_gifconf - register a SIOCGIF handler
3502 * @family: Address family
3503 * @gifconf: Function handler
3505 * Register protocol dependent address dumping routines. The handler
3506 * that is passed must not be freed or reused until it has been replaced
3507 * by another handler.
3509 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3511 if (family >= NPROTO)
3513 gifconf_list[family] = gifconf;
3516 EXPORT_SYMBOL(register_gifconf);
3520 * Map an interface index to its name (SIOCGIFNAME)
3524 * We need this ioctl for efficient implementation of the
3525 * if_indextoname() function required by the IPv6 API. Without
3526 * it, we would have to search all the interfaces to find a
3530 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3532 struct net_device *dev;
3536 * Fetch the caller's info block.
3539 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3543 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3549 strcpy(ifr.ifr_name, dev->name);
3552 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3558 * Perform a SIOCGIFCONF call. This structure will change
3559 * size eventually, and there is nothing I can do about it.
3560 * Thus we will need a 'compatibility mode'.
3563 static int dev_ifconf(struct net *net, char __user *arg)
3566 struct net_device *dev;
3573 * Fetch the caller's info block.
3576 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3583 * Loop over the interfaces, and write an info block for each.
3587 for_each_netdev(net, dev) {
3588 for (i = 0; i < NPROTO; i++) {
3589 if (gifconf_list[i]) {
3592 done = gifconf_list[i](dev, NULL, 0);
3594 done = gifconf_list[i](dev, pos + total,
3604 * All done. Write the updated control block back to the caller.
3606 ifc.ifc_len = total;
3609 * Both BSD and Solaris return 0 here, so we do too.
3611 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3614 #ifdef CONFIG_PROC_FS
3616 * This is invoked by the /proc filesystem handler to display a device
3619 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3622 struct net *net = seq_file_net(seq);
3624 struct net_device *dev;
3628 return SEQ_START_TOKEN;
3631 for_each_netdev_rcu(net, dev)
3638 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3640 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3641 first_net_device(seq_file_net(seq)) :
3642 next_net_device((struct net_device *)v);
3645 return rcu_dereference(dev);
3648 void dev_seq_stop(struct seq_file *seq, void *v)
3654 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3656 const struct net_device_stats *stats = dev_get_stats(dev);
3658 seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3659 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3660 dev->name, stats->rx_bytes, stats->rx_packets,
3662 stats->rx_dropped + stats->rx_missed_errors,
3663 stats->rx_fifo_errors,
3664 stats->rx_length_errors + stats->rx_over_errors +
3665 stats->rx_crc_errors + stats->rx_frame_errors,
3666 stats->rx_compressed, stats->multicast,
3667 stats->tx_bytes, stats->tx_packets,
3668 stats->tx_errors, stats->tx_dropped,
3669 stats->tx_fifo_errors, stats->collisions,
3670 stats->tx_carrier_errors +
3671 stats->tx_aborted_errors +
3672 stats->tx_window_errors +
3673 stats->tx_heartbeat_errors,
3674 stats->tx_compressed);
3678 * Called from the PROCfs module. This now uses the new arbitrary sized
3679 * /proc/net interface to create /proc/net/dev
3681 static int dev_seq_show(struct seq_file *seq, void *v)
3683 if (v == SEQ_START_TOKEN)
3684 seq_puts(seq, "Inter-| Receive "
3686 " face |bytes packets errs drop fifo frame "
3687 "compressed multicast|bytes packets errs "
3688 "drop fifo colls carrier compressed\n");
3690 dev_seq_printf_stats(seq, v);
3694 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
3696 struct netif_rx_stats *rc = NULL;
3698 while (*pos < nr_cpu_ids)
3699 if (cpu_online(*pos)) {
3700 rc = &per_cpu(netdev_rx_stat, *pos);
3707 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3709 return softnet_get_online(pos);
3712 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3715 return softnet_get_online(pos);
3718 static void softnet_seq_stop(struct seq_file *seq, void *v)
3722 static int softnet_seq_show(struct seq_file *seq, void *v)
3724 struct netif_rx_stats *s = v;
3726 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3727 s->total, s->dropped, s->time_squeeze, 0,
3728 0, 0, 0, 0, /* was fastroute */
3729 s->cpu_collision, s->received_rps);
3733 static const struct seq_operations dev_seq_ops = {
3734 .start = dev_seq_start,
3735 .next = dev_seq_next,
3736 .stop = dev_seq_stop,
3737 .show = dev_seq_show,
3740 static int dev_seq_open(struct inode *inode, struct file *file)
3742 return seq_open_net(inode, file, &dev_seq_ops,
3743 sizeof(struct seq_net_private));
3746 static const struct file_operations dev_seq_fops = {
3747 .owner = THIS_MODULE,
3748 .open = dev_seq_open,
3750 .llseek = seq_lseek,
3751 .release = seq_release_net,
3754 static const struct seq_operations softnet_seq_ops = {
3755 .start = softnet_seq_start,
3756 .next = softnet_seq_next,
3757 .stop = softnet_seq_stop,
3758 .show = softnet_seq_show,
3761 static int softnet_seq_open(struct inode *inode, struct file *file)
3763 return seq_open(file, &softnet_seq_ops);
3766 static const struct file_operations softnet_seq_fops = {
3767 .owner = THIS_MODULE,
3768 .open = softnet_seq_open,
3770 .llseek = seq_lseek,
3771 .release = seq_release,
3774 static void *ptype_get_idx(loff_t pos)
3776 struct packet_type *pt = NULL;
3780 list_for_each_entry_rcu(pt, &ptype_all, list) {
3786 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3787 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3796 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3800 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3803 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3805 struct packet_type *pt;
3806 struct list_head *nxt;
3810 if (v == SEQ_START_TOKEN)
3811 return ptype_get_idx(0);
3814 nxt = pt->list.next;
3815 if (pt->type == htons(ETH_P_ALL)) {
3816 if (nxt != &ptype_all)
3819 nxt = ptype_base[0].next;
3821 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3823 while (nxt == &ptype_base[hash]) {
3824 if (++hash >= PTYPE_HASH_SIZE)
3826 nxt = ptype_base[hash].next;
3829 return list_entry(nxt, struct packet_type, list);
3832 static void ptype_seq_stop(struct seq_file *seq, void *v)
3838 static int ptype_seq_show(struct seq_file *seq, void *v)
3840 struct packet_type *pt = v;
3842 if (v == SEQ_START_TOKEN)
3843 seq_puts(seq, "Type Device Function\n");
3844 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3845 if (pt->type == htons(ETH_P_ALL))
3846 seq_puts(seq, "ALL ");
3848 seq_printf(seq, "%04x", ntohs(pt->type));
3850 seq_printf(seq, " %-8s %pF\n",
3851 pt->dev ? pt->dev->name : "", pt->func);
3857 static const struct seq_operations ptype_seq_ops = {
3858 .start = ptype_seq_start,
3859 .next = ptype_seq_next,
3860 .stop = ptype_seq_stop,
3861 .show = ptype_seq_show,
3864 static int ptype_seq_open(struct inode *inode, struct file *file)
3866 return seq_open_net(inode, file, &ptype_seq_ops,
3867 sizeof(struct seq_net_private));
3870 static const struct file_operations ptype_seq_fops = {
3871 .owner = THIS_MODULE,
3872 .open = ptype_seq_open,
3874 .llseek = seq_lseek,
3875 .release = seq_release_net,
3879 static int __net_init dev_proc_net_init(struct net *net)
3883 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3885 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3887 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3890 if (wext_proc_init(net))
3896 proc_net_remove(net, "ptype");
3898 proc_net_remove(net, "softnet_stat");
3900 proc_net_remove(net, "dev");
3904 static void __net_exit dev_proc_net_exit(struct net *net)
3906 wext_proc_exit(net);
3908 proc_net_remove(net, "ptype");
3909 proc_net_remove(net, "softnet_stat");
3910 proc_net_remove(net, "dev");
3913 static struct pernet_operations __net_initdata dev_proc_ops = {
3914 .init = dev_proc_net_init,
3915 .exit = dev_proc_net_exit,
3918 static int __init dev_proc_init(void)
3920 return register_pernet_subsys(&dev_proc_ops);
3923 #define dev_proc_init() 0
3924 #endif /* CONFIG_PROC_FS */
3928 * netdev_set_master - set up master/slave pair
3929 * @slave: slave device
3930 * @master: new master device
3932 * Changes the master device of the slave. Pass %NULL to break the
3933 * bonding. The caller must hold the RTNL semaphore. On a failure
3934 * a negative errno code is returned. On success the reference counts
3935 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3936 * function returns zero.
3938 int netdev_set_master(struct net_device *slave, struct net_device *master)
3940 struct net_device *old = slave->master;
3950 slave->master = master;
3957 slave->flags |= IFF_SLAVE;
3959 slave->flags &= ~IFF_SLAVE;
3961 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3964 EXPORT_SYMBOL(netdev_set_master);
3966 static void dev_change_rx_flags(struct net_device *dev, int flags)
3968 const struct net_device_ops *ops = dev->netdev_ops;
3970 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3971 ops->ndo_change_rx_flags(dev, flags);
3974 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3976 unsigned short old_flags = dev->flags;
3982 dev->flags |= IFF_PROMISC;
3983 dev->promiscuity += inc;
3984 if (dev->promiscuity == 0) {
3987 * If inc causes overflow, untouch promisc and return error.
3990 dev->flags &= ~IFF_PROMISC;
3992 dev->promiscuity -= inc;
3993 printk(KERN_WARNING "%s: promiscuity touches roof, "
3994 "set promiscuity failed, promiscuity feature "
3995 "of device might be broken.\n", dev->name);
3999 if (dev->flags != old_flags) {
4000 printk(KERN_INFO "device %s %s promiscuous mode\n",
4001 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4003 if (audit_enabled) {
4004 current_uid_gid(&uid, &gid);
4005 audit_log(current->audit_context, GFP_ATOMIC,
4006 AUDIT_ANOM_PROMISCUOUS,
4007 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4008 dev->name, (dev->flags & IFF_PROMISC),
4009 (old_flags & IFF_PROMISC),
4010 audit_get_loginuid(current),
4012 audit_get_sessionid(current));
4015 dev_change_rx_flags(dev, IFF_PROMISC);
4021 * dev_set_promiscuity - update promiscuity count on a device
4025 * Add or remove promiscuity from a device. While the count in the device
4026 * remains above zero the interface remains promiscuous. Once it hits zero
4027 * the device reverts back to normal filtering operation. A negative inc
4028 * value is used to drop promiscuity on the device.
4029 * Return 0 if successful or a negative errno code on error.
4031 int dev_set_promiscuity(struct net_device *dev, int inc)
4033 unsigned short old_flags = dev->flags;
4036 err = __dev_set_promiscuity(dev, inc);
4039 if (dev->flags != old_flags)
4040 dev_set_rx_mode(dev);
4043 EXPORT_SYMBOL(dev_set_promiscuity);
4046 * dev_set_allmulti - update allmulti count on a device
4050 * Add or remove reception of all multicast frames to a device. While the
4051 * count in the device remains above zero the interface remains listening
4052 * to all interfaces. Once it hits zero the device reverts back to normal
4053 * filtering operation. A negative @inc value is used to drop the counter
4054 * when releasing a resource needing all multicasts.
4055 * Return 0 if successful or a negative errno code on error.
4058 int dev_set_allmulti(struct net_device *dev, int inc)
4060 unsigned short old_flags = dev->flags;
4064 dev->flags |= IFF_ALLMULTI;
4065 dev->allmulti += inc;
4066 if (dev->allmulti == 0) {
4069 * If inc causes overflow, untouch allmulti and return error.
4072 dev->flags &= ~IFF_ALLMULTI;
4074 dev->allmulti -= inc;
4075 printk(KERN_WARNING "%s: allmulti touches roof, "
4076 "set allmulti failed, allmulti feature of "
4077 "device might be broken.\n", dev->name);
4081 if (dev->flags ^ old_flags) {
4082 dev_change_rx_flags(dev, IFF_ALLMULTI);
4083 dev_set_rx_mode(dev);
4087 EXPORT_SYMBOL(dev_set_allmulti);
4090 * Upload unicast and multicast address lists to device and
4091 * configure RX filtering. When the device doesn't support unicast
4092 * filtering it is put in promiscuous mode while unicast addresses
4095 void __dev_set_rx_mode(struct net_device *dev)
4097 const struct net_device_ops *ops = dev->netdev_ops;
4099 /* dev_open will call this function so the list will stay sane. */
4100 if (!(dev->flags&IFF_UP))
4103 if (!netif_device_present(dev))
4106 if (ops->ndo_set_rx_mode)
4107 ops->ndo_set_rx_mode(dev);
4109 /* Unicast addresses changes may only happen under the rtnl,
4110 * therefore calling __dev_set_promiscuity here is safe.
4112 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4113 __dev_set_promiscuity(dev, 1);
4114 dev->uc_promisc = 1;
4115 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4116 __dev_set_promiscuity(dev, -1);
4117 dev->uc_promisc = 0;
4120 if (ops->ndo_set_multicast_list)
4121 ops->ndo_set_multicast_list(dev);
4125 void dev_set_rx_mode(struct net_device *dev)
4127 netif_addr_lock_bh(dev);
4128 __dev_set_rx_mode(dev);
4129 netif_addr_unlock_bh(dev);
4133 * dev_get_flags - get flags reported to userspace
4136 * Get the combination of flag bits exported through APIs to userspace.
4138 unsigned dev_get_flags(const struct net_device *dev)
4142 flags = (dev->flags & ~(IFF_PROMISC |
4147 (dev->gflags & (IFF_PROMISC |
4150 if (netif_running(dev)) {
4151 if (netif_oper_up(dev))
4152 flags |= IFF_RUNNING;
4153 if (netif_carrier_ok(dev))
4154 flags |= IFF_LOWER_UP;
4155 if (netif_dormant(dev))
4156 flags |= IFF_DORMANT;
4161 EXPORT_SYMBOL(dev_get_flags);
4163 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4165 int old_flags = dev->flags;
4171 * Set the flags on our device.
4174 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4175 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4177 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4181 * Load in the correct multicast list now the flags have changed.
4184 if ((old_flags ^ flags) & IFF_MULTICAST)
4185 dev_change_rx_flags(dev, IFF_MULTICAST);
4187 dev_set_rx_mode(dev);
4190 * Have we downed the interface. We handle IFF_UP ourselves
4191 * according to user attempts to set it, rather than blindly
4196 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4197 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4200 dev_set_rx_mode(dev);
4203 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4204 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4206 dev->gflags ^= IFF_PROMISC;
4207 dev_set_promiscuity(dev, inc);
4210 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4211 is important. Some (broken) drivers set IFF_PROMISC, when
4212 IFF_ALLMULTI is requested not asking us and not reporting.
4214 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4215 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4217 dev->gflags ^= IFF_ALLMULTI;
4218 dev_set_allmulti(dev, inc);
4224 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4226 unsigned int changes = dev->flags ^ old_flags;
4228 if (changes & IFF_UP) {
4229 if (dev->flags & IFF_UP)
4230 call_netdevice_notifiers(NETDEV_UP, dev);
4232 call_netdevice_notifiers(NETDEV_DOWN, dev);
4235 if (dev->flags & IFF_UP &&
4236 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4237 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4241 * dev_change_flags - change device settings
4243 * @flags: device state flags
4245 * Change settings on device based state flags. The flags are
4246 * in the userspace exported format.
4248 int dev_change_flags(struct net_device *dev, unsigned flags)
4251 int old_flags = dev->flags;
4253 ret = __dev_change_flags(dev, flags);
4257 changes = old_flags ^ dev->flags;
4259 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4261 __dev_notify_flags(dev, old_flags);
4264 EXPORT_SYMBOL(dev_change_flags);
4267 * dev_set_mtu - Change maximum transfer unit
4269 * @new_mtu: new transfer unit
4271 * Change the maximum transfer size of the network device.
4273 int dev_set_mtu(struct net_device *dev, int new_mtu)
4275 const struct net_device_ops *ops = dev->netdev_ops;
4278 if (new_mtu == dev->mtu)
4281 /* MTU must be positive. */
4285 if (!netif_device_present(dev))
4289 if (ops->ndo_change_mtu)
4290 err = ops->ndo_change_mtu(dev, new_mtu);
4294 if (!err && dev->flags & IFF_UP)
4295 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4298 EXPORT_SYMBOL(dev_set_mtu);
4301 * dev_set_mac_address - Change Media Access Control Address
4305 * Change the hardware (MAC) address of the device
4307 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4309 const struct net_device_ops *ops = dev->netdev_ops;
4312 if (!ops->ndo_set_mac_address)
4314 if (sa->sa_family != dev->type)
4316 if (!netif_device_present(dev))
4318 err = ops->ndo_set_mac_address(dev, sa);
4320 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4323 EXPORT_SYMBOL(dev_set_mac_address);
4326 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4328 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4331 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4337 case SIOCGIFFLAGS: /* Get interface flags */
4338 ifr->ifr_flags = (short) dev_get_flags(dev);
4341 case SIOCGIFMETRIC: /* Get the metric on the interface
4342 (currently unused) */
4343 ifr->ifr_metric = 0;
4346 case SIOCGIFMTU: /* Get the MTU of a device */
4347 ifr->ifr_mtu = dev->mtu;
4352 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4354 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4355 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4356 ifr->ifr_hwaddr.sa_family = dev->type;
4364 ifr->ifr_map.mem_start = dev->mem_start;
4365 ifr->ifr_map.mem_end = dev->mem_end;
4366 ifr->ifr_map.base_addr = dev->base_addr;
4367 ifr->ifr_map.irq = dev->irq;
4368 ifr->ifr_map.dma = dev->dma;
4369 ifr->ifr_map.port = dev->if_port;
4373 ifr->ifr_ifindex = dev->ifindex;
4377 ifr->ifr_qlen = dev->tx_queue_len;
4381 /* dev_ioctl() should ensure this case
4393 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4395 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4398 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4399 const struct net_device_ops *ops;
4404 ops = dev->netdev_ops;
4407 case SIOCSIFFLAGS: /* Set interface flags */
4408 return dev_change_flags(dev, ifr->ifr_flags);
4410 case SIOCSIFMETRIC: /* Set the metric on the interface
4411 (currently unused) */
4414 case SIOCSIFMTU: /* Set the MTU of a device */
4415 return dev_set_mtu(dev, ifr->ifr_mtu);
4418 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4420 case SIOCSIFHWBROADCAST:
4421 if (ifr->ifr_hwaddr.sa_family != dev->type)
4423 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4424 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4425 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4429 if (ops->ndo_set_config) {
4430 if (!netif_device_present(dev))
4432 return ops->ndo_set_config(dev, &ifr->ifr_map);
4437 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4438 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4440 if (!netif_device_present(dev))
4442 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4445 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4446 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4448 if (!netif_device_present(dev))
4450 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4453 if (ifr->ifr_qlen < 0)
4455 dev->tx_queue_len = ifr->ifr_qlen;
4459 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4460 return dev_change_name(dev, ifr->ifr_newname);
4463 * Unknown or private ioctl
4466 if ((cmd >= SIOCDEVPRIVATE &&
4467 cmd <= SIOCDEVPRIVATE + 15) ||
4468 cmd == SIOCBONDENSLAVE ||
4469 cmd == SIOCBONDRELEASE ||
4470 cmd == SIOCBONDSETHWADDR ||
4471 cmd == SIOCBONDSLAVEINFOQUERY ||
4472 cmd == SIOCBONDINFOQUERY ||
4473 cmd == SIOCBONDCHANGEACTIVE ||
4474 cmd == SIOCGMIIPHY ||
4475 cmd == SIOCGMIIREG ||
4476 cmd == SIOCSMIIREG ||
4477 cmd == SIOCBRADDIF ||
4478 cmd == SIOCBRDELIF ||
4479 cmd == SIOCSHWTSTAMP ||
4480 cmd == SIOCWANDEV) {
4482 if (ops->ndo_do_ioctl) {
4483 if (netif_device_present(dev))
4484 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4496 * This function handles all "interface"-type I/O control requests. The actual
4497 * 'doing' part of this is dev_ifsioc above.
4501 * dev_ioctl - network device ioctl
4502 * @net: the applicable net namespace
4503 * @cmd: command to issue
4504 * @arg: pointer to a struct ifreq in user space
4506 * Issue ioctl functions to devices. This is normally called by the
4507 * user space syscall interfaces but can sometimes be useful for
4508 * other purposes. The return value is the return from the syscall if
4509 * positive or a negative errno code on error.
4512 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4518 /* One special case: SIOCGIFCONF takes ifconf argument
4519 and requires shared lock, because it sleeps writing
4523 if (cmd == SIOCGIFCONF) {
4525 ret = dev_ifconf(net, (char __user *) arg);
4529 if (cmd == SIOCGIFNAME)
4530 return dev_ifname(net, (struct ifreq __user *)arg);
4532 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4535 ifr.ifr_name[IFNAMSIZ-1] = 0;
4537 colon = strchr(ifr.ifr_name, ':');
4542 * See which interface the caller is talking about.
4547 * These ioctl calls:
4548 * - can be done by all.
4549 * - atomic and do not require locking.
4560 dev_load(net, ifr.ifr_name);
4562 ret = dev_ifsioc_locked(net, &ifr, cmd);
4567 if (copy_to_user(arg, &ifr,
4568 sizeof(struct ifreq)))
4574 dev_load(net, ifr.ifr_name);
4576 ret = dev_ethtool(net, &ifr);
4581 if (copy_to_user(arg, &ifr,
4582 sizeof(struct ifreq)))
4588 * These ioctl calls:
4589 * - require superuser power.
4590 * - require strict serialization.
4596 if (!capable(CAP_NET_ADMIN))
4598 dev_load(net, ifr.ifr_name);
4600 ret = dev_ifsioc(net, &ifr, cmd);
4605 if (copy_to_user(arg, &ifr,
4606 sizeof(struct ifreq)))
4612 * These ioctl calls:
4613 * - require superuser power.
4614 * - require strict serialization.
4615 * - do not return a value
4625 case SIOCSIFHWBROADCAST:
4628 case SIOCBONDENSLAVE:
4629 case SIOCBONDRELEASE:
4630 case SIOCBONDSETHWADDR:
4631 case SIOCBONDCHANGEACTIVE:
4635 if (!capable(CAP_NET_ADMIN))
4638 case SIOCBONDSLAVEINFOQUERY:
4639 case SIOCBONDINFOQUERY:
4640 dev_load(net, ifr.ifr_name);
4642 ret = dev_ifsioc(net, &ifr, cmd);
4647 /* Get the per device memory space. We can add this but
4648 * currently do not support it */
4650 /* Set the per device memory buffer space.
4651 * Not applicable in our case */
4656 * Unknown or private ioctl.
4659 if (cmd == SIOCWANDEV ||
4660 (cmd >= SIOCDEVPRIVATE &&
4661 cmd <= SIOCDEVPRIVATE + 15)) {
4662 dev_load(net, ifr.ifr_name);
4664 ret = dev_ifsioc(net, &ifr, cmd);
4666 if (!ret && copy_to_user(arg, &ifr,
4667 sizeof(struct ifreq)))
4671 /* Take care of Wireless Extensions */
4672 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4673 return wext_handle_ioctl(net, &ifr, cmd, arg);
4680 * dev_new_index - allocate an ifindex
4681 * @net: the applicable net namespace
4683 * Returns a suitable unique value for a new device interface
4684 * number. The caller must hold the rtnl semaphore or the
4685 * dev_base_lock to be sure it remains unique.
4687 static int dev_new_index(struct net *net)
4693 if (!__dev_get_by_index(net, ifindex))
4698 /* Delayed registration/unregisteration */
4699 static LIST_HEAD(net_todo_list);
4701 static void net_set_todo(struct net_device *dev)
4703 list_add_tail(&dev->todo_list, &net_todo_list);
4706 static void rollback_registered_many(struct list_head *head)
4708 struct net_device *dev, *tmp;
4710 BUG_ON(dev_boot_phase);
4713 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4714 /* Some devices call without registering
4715 * for initialization unwind. Remove those
4716 * devices and proceed with the remaining.
4718 if (dev->reg_state == NETREG_UNINITIALIZED) {
4719 pr_debug("unregister_netdevice: device %s/%p never "
4720 "was registered\n", dev->name, dev);
4723 list_del(&dev->unreg_list);
4727 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4729 /* If device is running, close it first. */
4732 /* And unlink it from device chain. */
4733 unlist_netdevice(dev);
4735 dev->reg_state = NETREG_UNREGISTERING;
4740 list_for_each_entry(dev, head, unreg_list) {
4741 /* Shutdown queueing discipline. */
4745 /* Notify protocols, that we are about to destroy
4746 this device. They should clean all the things.
4748 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4750 if (!dev->rtnl_link_ops ||
4751 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4752 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4755 * Flush the unicast and multicast chains
4760 if (dev->netdev_ops->ndo_uninit)
4761 dev->netdev_ops->ndo_uninit(dev);
4763 /* Notifier chain MUST detach us from master device. */
4764 WARN_ON(dev->master);
4766 /* Remove entries from kobject tree */
4767 netdev_unregister_kobject(dev);
4770 /* Process any work delayed until the end of the batch */
4771 dev = list_first_entry(head, struct net_device, unreg_list);
4772 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4776 list_for_each_entry(dev, head, unreg_list)
4780 static void rollback_registered(struct net_device *dev)
4784 list_add(&dev->unreg_list, &single);
4785 rollback_registered_many(&single);
4788 static void __netdev_init_queue_locks_one(struct net_device *dev,
4789 struct netdev_queue *dev_queue,
4792 spin_lock_init(&dev_queue->_xmit_lock);
4793 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4794 dev_queue->xmit_lock_owner = -1;
4797 static void netdev_init_queue_locks(struct net_device *dev)
4799 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4800 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4803 unsigned long netdev_fix_features(unsigned long features, const char *name)
4805 /* Fix illegal SG+CSUM combinations. */
4806 if ((features & NETIF_F_SG) &&
4807 !(features & NETIF_F_ALL_CSUM)) {
4809 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4810 "checksum feature.\n", name);
4811 features &= ~NETIF_F_SG;
4814 /* TSO requires that SG is present as well. */
4815 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4817 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4818 "SG feature.\n", name);
4819 features &= ~NETIF_F_TSO;
4822 if (features & NETIF_F_UFO) {
4823 if (!(features & NETIF_F_GEN_CSUM)) {
4825 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4826 "since no NETIF_F_HW_CSUM feature.\n",
4828 features &= ~NETIF_F_UFO;
4831 if (!(features & NETIF_F_SG)) {
4833 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4834 "since no NETIF_F_SG feature.\n", name);
4835 features &= ~NETIF_F_UFO;
4841 EXPORT_SYMBOL(netdev_fix_features);
4844 * netif_stacked_transfer_operstate - transfer operstate
4845 * @rootdev: the root or lower level device to transfer state from
4846 * @dev: the device to transfer operstate to
4848 * Transfer operational state from root to device. This is normally
4849 * called when a stacking relationship exists between the root
4850 * device and the device(a leaf device).
4852 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4853 struct net_device *dev)
4855 if (rootdev->operstate == IF_OPER_DORMANT)
4856 netif_dormant_on(dev);
4858 netif_dormant_off(dev);
4860 if (netif_carrier_ok(rootdev)) {
4861 if (!netif_carrier_ok(dev))
4862 netif_carrier_on(dev);
4864 if (netif_carrier_ok(dev))
4865 netif_carrier_off(dev);
4868 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4871 * register_netdevice - register a network device
4872 * @dev: device to register
4874 * Take a completed network device structure and add it to the kernel
4875 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4876 * chain. 0 is returned on success. A negative errno code is returned
4877 * on a failure to set up the device, or if the name is a duplicate.
4879 * Callers must hold the rtnl semaphore. You may want
4880 * register_netdev() instead of this.
4883 * The locking appears insufficient to guarantee two parallel registers
4884 * will not get the same name.
4887 int register_netdevice(struct net_device *dev)
4890 struct net *net = dev_net(dev);
4892 BUG_ON(dev_boot_phase);
4897 /* When net_device's are persistent, this will be fatal. */
4898 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4901 spin_lock_init(&dev->addr_list_lock);
4902 netdev_set_addr_lockdep_class(dev);
4903 netdev_init_queue_locks(dev);
4908 if (!dev->num_rx_queues) {
4910 * Allocate a single RX queue if driver never called
4914 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
4920 dev->_rx->first = dev->_rx;
4921 atomic_set(&dev->_rx->count, 1);
4922 dev->num_rx_queues = 1;
4925 /* Init, if this function is available */
4926 if (dev->netdev_ops->ndo_init) {
4927 ret = dev->netdev_ops->ndo_init(dev);
4935 ret = dev_get_valid_name(net, dev->name, dev->name, 0);
4939 dev->ifindex = dev_new_index(net);
4940 if (dev->iflink == -1)
4941 dev->iflink = dev->ifindex;
4943 /* Fix illegal checksum combinations */
4944 if ((dev->features & NETIF_F_HW_CSUM) &&
4945 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4946 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4948 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4951 if ((dev->features & NETIF_F_NO_CSUM) &&
4952 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4953 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4955 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4958 dev->features = netdev_fix_features(dev->features, dev->name);
4960 /* Enable software GSO if SG is supported. */
4961 if (dev->features & NETIF_F_SG)
4962 dev->features |= NETIF_F_GSO;
4964 netdev_initialize_kobject(dev);
4966 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
4967 ret = notifier_to_errno(ret);
4971 ret = netdev_register_kobject(dev);
4974 dev->reg_state = NETREG_REGISTERED;
4977 * Default initial state at registry is that the
4978 * device is present.
4981 set_bit(__LINK_STATE_PRESENT, &dev->state);
4983 dev_init_scheduler(dev);
4985 list_netdevice(dev);
4987 /* Notify protocols, that a new device appeared. */
4988 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4989 ret = notifier_to_errno(ret);
4991 rollback_registered(dev);
4992 dev->reg_state = NETREG_UNREGISTERED;
4995 * Prevent userspace races by waiting until the network
4996 * device is fully setup before sending notifications.
4998 if (!dev->rtnl_link_ops ||
4999 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5000 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5006 if (dev->netdev_ops->ndo_uninit)
5007 dev->netdev_ops->ndo_uninit(dev);
5010 EXPORT_SYMBOL(register_netdevice);
5013 * init_dummy_netdev - init a dummy network device for NAPI
5014 * @dev: device to init
5016 * This takes a network device structure and initialize the minimum
5017 * amount of fields so it can be used to schedule NAPI polls without
5018 * registering a full blown interface. This is to be used by drivers
5019 * that need to tie several hardware interfaces to a single NAPI
5020 * poll scheduler due to HW limitations.
5022 int init_dummy_netdev(struct net_device *dev)
5024 /* Clear everything. Note we don't initialize spinlocks
5025 * are they aren't supposed to be taken by any of the
5026 * NAPI code and this dummy netdev is supposed to be
5027 * only ever used for NAPI polls
5029 memset(dev, 0, sizeof(struct net_device));
5031 /* make sure we BUG if trying to hit standard
5032 * register/unregister code path
5034 dev->reg_state = NETREG_DUMMY;
5036 /* initialize the ref count */
5037 atomic_set(&dev->refcnt, 1);
5039 /* NAPI wants this */
5040 INIT_LIST_HEAD(&dev->napi_list);
5042 /* a dummy interface is started by default */
5043 set_bit(__LINK_STATE_PRESENT, &dev->state);
5044 set_bit(__LINK_STATE_START, &dev->state);
5048 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5052 * register_netdev - register a network device
5053 * @dev: device to register
5055 * Take a completed network device structure and add it to the kernel
5056 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5057 * chain. 0 is returned on success. A negative errno code is returned
5058 * on a failure to set up the device, or if the name is a duplicate.
5060 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5061 * and expands the device name if you passed a format string to
5064 int register_netdev(struct net_device *dev)
5071 * If the name is a format string the caller wants us to do a
5074 if (strchr(dev->name, '%')) {
5075 err = dev_alloc_name(dev, dev->name);
5080 err = register_netdevice(dev);
5085 EXPORT_SYMBOL(register_netdev);
5088 * netdev_wait_allrefs - wait until all references are gone.
5090 * This is called when unregistering network devices.
5092 * Any protocol or device that holds a reference should register
5093 * for netdevice notification, and cleanup and put back the
5094 * reference if they receive an UNREGISTER event.
5095 * We can get stuck here if buggy protocols don't correctly
5098 static void netdev_wait_allrefs(struct net_device *dev)
5100 unsigned long rebroadcast_time, warning_time;
5102 linkwatch_forget_dev(dev);
5104 rebroadcast_time = warning_time = jiffies;
5105 while (atomic_read(&dev->refcnt) != 0) {
5106 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5109 /* Rebroadcast unregister notification */
5110 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5111 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5112 * should have already handle it the first time */
5114 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5116 /* We must not have linkwatch events
5117 * pending on unregister. If this
5118 * happens, we simply run the queue
5119 * unscheduled, resulting in a noop
5122 linkwatch_run_queue();
5127 rebroadcast_time = jiffies;
5132 if (time_after(jiffies, warning_time + 10 * HZ)) {
5133 printk(KERN_EMERG "unregister_netdevice: "
5134 "waiting for %s to become free. Usage "
5136 dev->name, atomic_read(&dev->refcnt));
5137 warning_time = jiffies;
5146 * register_netdevice(x1);
5147 * register_netdevice(x2);
5149 * unregister_netdevice(y1);
5150 * unregister_netdevice(y2);
5156 * We are invoked by rtnl_unlock().
5157 * This allows us to deal with problems:
5158 * 1) We can delete sysfs objects which invoke hotplug
5159 * without deadlocking with linkwatch via keventd.
5160 * 2) Since we run with the RTNL semaphore not held, we can sleep
5161 * safely in order to wait for the netdev refcnt to drop to zero.
5163 * We must not return until all unregister events added during
5164 * the interval the lock was held have been completed.
5166 void netdev_run_todo(void)
5168 struct list_head list;
5170 /* Snapshot list, allow later requests */
5171 list_replace_init(&net_todo_list, &list);
5175 while (!list_empty(&list)) {
5176 struct net_device *dev
5177 = list_first_entry(&list, struct net_device, todo_list);
5178 list_del(&dev->todo_list);
5180 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5181 printk(KERN_ERR "network todo '%s' but state %d\n",
5182 dev->name, dev->reg_state);
5187 dev->reg_state = NETREG_UNREGISTERED;
5189 on_each_cpu(flush_backlog, dev, 1);
5191 netdev_wait_allrefs(dev);
5194 BUG_ON(atomic_read(&dev->refcnt));
5195 WARN_ON(dev->ip_ptr);
5196 WARN_ON(dev->ip6_ptr);
5197 WARN_ON(dev->dn_ptr);
5199 if (dev->destructor)
5200 dev->destructor(dev);
5202 /* Free network device */
5203 kobject_put(&dev->dev.kobj);
5208 * dev_txq_stats_fold - fold tx_queues stats
5209 * @dev: device to get statistics from
5210 * @stats: struct net_device_stats to hold results
5212 void dev_txq_stats_fold(const struct net_device *dev,
5213 struct net_device_stats *stats)
5215 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5217 struct netdev_queue *txq;
5219 for (i = 0; i < dev->num_tx_queues; i++) {
5220 txq = netdev_get_tx_queue(dev, i);
5221 tx_bytes += txq->tx_bytes;
5222 tx_packets += txq->tx_packets;
5223 tx_dropped += txq->tx_dropped;
5225 if (tx_bytes || tx_packets || tx_dropped) {
5226 stats->tx_bytes = tx_bytes;
5227 stats->tx_packets = tx_packets;
5228 stats->tx_dropped = tx_dropped;
5231 EXPORT_SYMBOL(dev_txq_stats_fold);
5234 * dev_get_stats - get network device statistics
5235 * @dev: device to get statistics from
5237 * Get network statistics from device. The device driver may provide
5238 * its own method by setting dev->netdev_ops->get_stats; otherwise
5239 * the internal statistics structure is used.
5241 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5243 const struct net_device_ops *ops = dev->netdev_ops;
5245 if (ops->ndo_get_stats)
5246 return ops->ndo_get_stats(dev);
5248 dev_txq_stats_fold(dev, &dev->stats);
5251 EXPORT_SYMBOL(dev_get_stats);
5253 static void netdev_init_one_queue(struct net_device *dev,
5254 struct netdev_queue *queue,
5260 static void netdev_init_queues(struct net_device *dev)
5262 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5263 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5264 spin_lock_init(&dev->tx_global_lock);
5268 * alloc_netdev_mq - allocate network device
5269 * @sizeof_priv: size of private data to allocate space for
5270 * @name: device name format string
5271 * @setup: callback to initialize device
5272 * @queue_count: the number of subqueues to allocate
5274 * Allocates a struct net_device with private data area for driver use
5275 * and performs basic initialization. Also allocates subquue structs
5276 * for each queue on the device at the end of the netdevice.
5278 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5279 void (*setup)(struct net_device *), unsigned int queue_count)
5281 struct netdev_queue *tx;
5282 struct net_device *dev;
5284 struct net_device *p;
5286 struct netdev_rx_queue *rx;
5290 BUG_ON(strlen(name) >= sizeof(dev->name));
5292 alloc_size = sizeof(struct net_device);
5294 /* ensure 32-byte alignment of private area */
5295 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5296 alloc_size += sizeof_priv;
5298 /* ensure 32-byte alignment of whole construct */
5299 alloc_size += NETDEV_ALIGN - 1;
5301 p = kzalloc(alloc_size, GFP_KERNEL);
5303 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5307 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5309 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5315 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5317 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5322 atomic_set(&rx->count, queue_count);
5325 * Set a pointer to first element in the array which holds the
5328 for (i = 0; i < queue_count; i++)
5332 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5333 dev->padded = (char *)dev - (char *)p;
5335 if (dev_addr_init(dev))
5341 dev_net_set(dev, &init_net);
5344 dev->num_tx_queues = queue_count;
5345 dev->real_num_tx_queues = queue_count;
5349 dev->num_rx_queues = queue_count;
5352 dev->gso_max_size = GSO_MAX_SIZE;
5354 netdev_init_queues(dev);
5356 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5357 dev->ethtool_ntuple_list.count = 0;
5358 INIT_LIST_HEAD(&dev->napi_list);
5359 INIT_LIST_HEAD(&dev->unreg_list);
5360 INIT_LIST_HEAD(&dev->link_watch_list);
5361 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5363 strcpy(dev->name, name);
5376 EXPORT_SYMBOL(alloc_netdev_mq);
5379 * free_netdev - free network device
5382 * This function does the last stage of destroying an allocated device
5383 * interface. The reference to the device object is released.
5384 * If this is the last reference then it will be freed.
5386 void free_netdev(struct net_device *dev)
5388 struct napi_struct *p, *n;
5390 release_net(dev_net(dev));
5394 /* Flush device addresses */
5395 dev_addr_flush(dev);
5397 /* Clear ethtool n-tuple list */
5398 ethtool_ntuple_flush(dev);
5400 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5403 /* Compatibility with error handling in drivers */
5404 if (dev->reg_state == NETREG_UNINITIALIZED) {
5405 kfree((char *)dev - dev->padded);
5409 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5410 dev->reg_state = NETREG_RELEASED;
5412 /* will free via device release */
5413 put_device(&dev->dev);
5415 EXPORT_SYMBOL(free_netdev);
5418 * synchronize_net - Synchronize with packet receive processing
5420 * Wait for packets currently being received to be done.
5421 * Does not block later packets from starting.
5423 void synchronize_net(void)
5428 EXPORT_SYMBOL(synchronize_net);
5431 * unregister_netdevice_queue - remove device from the kernel
5435 * This function shuts down a device interface and removes it
5436 * from the kernel tables.
5437 * If head not NULL, device is queued to be unregistered later.
5439 * Callers must hold the rtnl semaphore. You may want
5440 * unregister_netdev() instead of this.
5443 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5448 list_move_tail(&dev->unreg_list, head);
5450 rollback_registered(dev);
5451 /* Finish processing unregister after unlock */
5455 EXPORT_SYMBOL(unregister_netdevice_queue);
5458 * unregister_netdevice_many - unregister many devices
5459 * @head: list of devices
5461 void unregister_netdevice_many(struct list_head *head)
5463 struct net_device *dev;
5465 if (!list_empty(head)) {
5466 rollback_registered_many(head);
5467 list_for_each_entry(dev, head, unreg_list)
5471 EXPORT_SYMBOL(unregister_netdevice_many);
5474 * unregister_netdev - remove device from the kernel
5477 * This function shuts down a device interface and removes it
5478 * from the kernel tables.
5480 * This is just a wrapper for unregister_netdevice that takes
5481 * the rtnl semaphore. In general you want to use this and not
5482 * unregister_netdevice.
5484 void unregister_netdev(struct net_device *dev)
5487 unregister_netdevice(dev);
5490 EXPORT_SYMBOL(unregister_netdev);
5493 * dev_change_net_namespace - move device to different nethost namespace
5495 * @net: network namespace
5496 * @pat: If not NULL name pattern to try if the current device name
5497 * is already taken in the destination network namespace.
5499 * This function shuts down a device interface and moves it
5500 * to a new network namespace. On success 0 is returned, on
5501 * a failure a netagive errno code is returned.
5503 * Callers must hold the rtnl semaphore.
5506 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5512 /* Don't allow namespace local devices to be moved. */
5514 if (dev->features & NETIF_F_NETNS_LOCAL)
5518 /* Don't allow real devices to be moved when sysfs
5522 if (dev->dev.parent)
5526 /* Ensure the device has been registrered */
5528 if (dev->reg_state != NETREG_REGISTERED)
5531 /* Get out if there is nothing todo */
5533 if (net_eq(dev_net(dev), net))
5536 /* Pick the destination device name, and ensure
5537 * we can use it in the destination network namespace.
5540 if (__dev_get_by_name(net, dev->name)) {
5541 /* We get here if we can't use the current device name */
5544 if (dev_get_valid_name(net, pat, dev->name, 1))
5549 * And now a mini version of register_netdevice unregister_netdevice.
5552 /* If device is running close it first. */
5555 /* And unlink it from device chain */
5557 unlist_netdevice(dev);
5561 /* Shutdown queueing discipline. */
5564 /* Notify protocols, that we are about to destroy
5565 this device. They should clean all the things.
5567 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5568 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5571 * Flush the unicast and multicast chains
5576 netdev_unregister_kobject(dev);
5578 /* Actually switch the network namespace */
5579 dev_net_set(dev, net);
5581 /* If there is an ifindex conflict assign a new one */
5582 if (__dev_get_by_index(net, dev->ifindex)) {
5583 int iflink = (dev->iflink == dev->ifindex);
5584 dev->ifindex = dev_new_index(net);
5586 dev->iflink = dev->ifindex;
5589 /* Fixup kobjects */
5590 err = netdev_register_kobject(dev);
5593 /* Add the device back in the hashes */
5594 list_netdevice(dev);
5596 /* Notify protocols, that a new device appeared. */
5597 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5600 * Prevent userspace races by waiting until the network
5601 * device is fully setup before sending notifications.
5603 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5610 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5612 static int dev_cpu_callback(struct notifier_block *nfb,
5613 unsigned long action,
5616 struct sk_buff **list_skb;
5617 struct sk_buff *skb;
5618 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5619 struct softnet_data *sd, *oldsd;
5621 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5624 local_irq_disable();
5625 cpu = smp_processor_id();
5626 sd = &per_cpu(softnet_data, cpu);
5627 oldsd = &per_cpu(softnet_data, oldcpu);
5629 /* Find end of our completion_queue. */
5630 list_skb = &sd->completion_queue;
5632 list_skb = &(*list_skb)->next;
5633 /* Append completion queue from offline CPU. */
5634 *list_skb = oldsd->completion_queue;
5635 oldsd->completion_queue = NULL;
5637 /* Append output queue from offline CPU. */
5638 if (oldsd->output_queue) {
5639 *sd->output_queue_tailp = oldsd->output_queue;
5640 sd->output_queue_tailp = oldsd->output_queue_tailp;
5641 oldsd->output_queue = NULL;
5642 oldsd->output_queue_tailp = &oldsd->output_queue;
5645 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5648 /* Process offline CPU's input_pkt_queue */
5649 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5651 input_queue_head_add(oldsd, 1);
5653 while ((skb = __skb_dequeue(&oldsd->process_queue)))
5661 * netdev_increment_features - increment feature set by one
5662 * @all: current feature set
5663 * @one: new feature set
5664 * @mask: mask feature set
5666 * Computes a new feature set after adding a device with feature set
5667 * @one to the master device with current feature set @all. Will not
5668 * enable anything that is off in @mask. Returns the new feature set.
5670 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5673 /* If device needs checksumming, downgrade to it. */
5674 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5675 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5676 else if (mask & NETIF_F_ALL_CSUM) {
5677 /* If one device supports v4/v6 checksumming, set for all. */
5678 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5679 !(all & NETIF_F_GEN_CSUM)) {
5680 all &= ~NETIF_F_ALL_CSUM;
5681 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5684 /* If one device supports hw checksumming, set for all. */
5685 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5686 all &= ~NETIF_F_ALL_CSUM;
5687 all |= NETIF_F_HW_CSUM;
5691 one |= NETIF_F_ALL_CSUM;
5693 one |= all & NETIF_F_ONE_FOR_ALL;
5694 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5695 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5699 EXPORT_SYMBOL(netdev_increment_features);
5701 static struct hlist_head *netdev_create_hash(void)
5704 struct hlist_head *hash;
5706 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5708 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5709 INIT_HLIST_HEAD(&hash[i]);
5714 /* Initialize per network namespace state */
5715 static int __net_init netdev_init(struct net *net)
5717 INIT_LIST_HEAD(&net->dev_base_head);
5719 net->dev_name_head = netdev_create_hash();
5720 if (net->dev_name_head == NULL)
5723 net->dev_index_head = netdev_create_hash();
5724 if (net->dev_index_head == NULL)
5730 kfree(net->dev_name_head);
5736 * netdev_drivername - network driver for the device
5737 * @dev: network device
5738 * @buffer: buffer for resulting name
5739 * @len: size of buffer
5741 * Determine network driver for device.
5743 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5745 const struct device_driver *driver;
5746 const struct device *parent;
5748 if (len <= 0 || !buffer)
5752 parent = dev->dev.parent;
5757 driver = parent->driver;
5758 if (driver && driver->name)
5759 strlcpy(buffer, driver->name, len);
5763 static void __net_exit netdev_exit(struct net *net)
5765 kfree(net->dev_name_head);
5766 kfree(net->dev_index_head);
5769 static struct pernet_operations __net_initdata netdev_net_ops = {
5770 .init = netdev_init,
5771 .exit = netdev_exit,
5774 static void __net_exit default_device_exit(struct net *net)
5776 struct net_device *dev, *aux;
5778 * Push all migratable network devices back to the
5779 * initial network namespace
5782 for_each_netdev_safe(net, dev, aux) {
5784 char fb_name[IFNAMSIZ];
5786 /* Ignore unmoveable devices (i.e. loopback) */
5787 if (dev->features & NETIF_F_NETNS_LOCAL)
5790 /* Leave virtual devices for the generic cleanup */
5791 if (dev->rtnl_link_ops)
5794 /* Push remaing network devices to init_net */
5795 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5796 err = dev_change_net_namespace(dev, &init_net, fb_name);
5798 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5799 __func__, dev->name, err);
5806 static void __net_exit default_device_exit_batch(struct list_head *net_list)
5808 /* At exit all network devices most be removed from a network
5809 * namespace. Do this in the reverse order of registeration.
5810 * Do this across as many network namespaces as possible to
5811 * improve batching efficiency.
5813 struct net_device *dev;
5815 LIST_HEAD(dev_kill_list);
5818 list_for_each_entry(net, net_list, exit_list) {
5819 for_each_netdev_reverse(net, dev) {
5820 if (dev->rtnl_link_ops)
5821 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
5823 unregister_netdevice_queue(dev, &dev_kill_list);
5826 unregister_netdevice_many(&dev_kill_list);
5830 static struct pernet_operations __net_initdata default_device_ops = {
5831 .exit = default_device_exit,
5832 .exit_batch = default_device_exit_batch,
5836 * Initialize the DEV module. At boot time this walks the device list and
5837 * unhooks any devices that fail to initialise (normally hardware not
5838 * present) and leaves us with a valid list of present and active devices.
5843 * This is called single threaded during boot, so no need
5844 * to take the rtnl semaphore.
5846 static int __init net_dev_init(void)
5848 int i, rc = -ENOMEM;
5850 BUG_ON(!dev_boot_phase);
5852 if (dev_proc_init())
5855 if (netdev_kobject_init())
5858 INIT_LIST_HEAD(&ptype_all);
5859 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5860 INIT_LIST_HEAD(&ptype_base[i]);
5862 if (register_pernet_subsys(&netdev_net_ops))
5866 * Initialise the packet receive queues.
5869 for_each_possible_cpu(i) {
5870 struct softnet_data *sd = &per_cpu(softnet_data, i);
5872 skb_queue_head_init(&sd->input_pkt_queue);
5873 skb_queue_head_init(&sd->process_queue);
5874 sd->completion_queue = NULL;
5875 INIT_LIST_HEAD(&sd->poll_list);
5876 sd->output_queue = NULL;
5877 sd->output_queue_tailp = &sd->output_queue;
5879 sd->csd.func = rps_trigger_softirq;
5885 sd->backlog.poll = process_backlog;
5886 sd->backlog.weight = weight_p;
5887 sd->backlog.gro_list = NULL;
5888 sd->backlog.gro_count = 0;
5893 /* The loopback device is special if any other network devices
5894 * is present in a network namespace the loopback device must
5895 * be present. Since we now dynamically allocate and free the
5896 * loopback device ensure this invariant is maintained by
5897 * keeping the loopback device as the first device on the
5898 * list of network devices. Ensuring the loopback devices
5899 * is the first device that appears and the last network device
5902 if (register_pernet_device(&loopback_net_ops))
5905 if (register_pernet_device(&default_device_ops))
5908 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5909 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5911 hotcpu_notifier(dev_cpu_callback, 0);
5919 subsys_initcall(net_dev_init);
5921 static int __init initialize_hashrnd(void)
5923 get_random_bytes(&hashrnd, sizeof(hashrnd));
5927 late_initcall_sync(initialize_hashrnd);