2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/hash.h>
83 #include <linux/slab.h>
84 #include <linux/sched.h>
85 #include <linux/mutex.h>
86 #include <linux/string.h>
88 #include <linux/socket.h>
89 #include <linux/sockios.h>
90 #include <linux/errno.h>
91 #include <linux/interrupt.h>
92 #include <linux/if_ether.h>
93 #include <linux/netdevice.h>
94 #include <linux/etherdevice.h>
95 #include <linux/ethtool.h>
96 #include <linux/notifier.h>
97 #include <linux/skbuff.h>
98 #include <net/net_namespace.h>
100 #include <linux/rtnetlink.h>
101 #include <linux/proc_fs.h>
102 #include <linux/seq_file.h>
103 #include <linux/stat.h>
104 #include <linux/if_bridge.h>
105 #include <linux/if_macvlan.h>
107 #include <net/pkt_sched.h>
108 #include <net/checksum.h>
109 #include <net/xfrm.h>
110 #include <linux/highmem.h>
111 #include <linux/init.h>
112 #include <linux/kmod.h>
113 #include <linux/module.h>
114 #include <linux/netpoll.h>
115 #include <linux/rcupdate.h>
116 #include <linux/delay.h>
117 #include <net/wext.h>
118 #include <net/iw_handler.h>
119 #include <asm/current.h>
120 #include <linux/audit.h>
121 #include <linux/dmaengine.h>
122 #include <linux/err.h>
123 #include <linux/ctype.h>
124 #include <linux/if_arp.h>
125 #include <linux/if_vlan.h>
126 #include <linux/ip.h>
128 #include <linux/ipv6.h>
129 #include <linux/in.h>
130 #include <linux/jhash.h>
131 #include <linux/random.h>
132 #include <trace/events/napi.h>
133 #include <linux/pci.h>
135 #include "net-sysfs.h"
137 /* Instead of increasing this, you should create a hash table. */
138 #define MAX_GRO_SKBS 8
140 /* This should be increased if a protocol with a bigger head is added. */
141 #define GRO_MAX_HEAD (MAX_HEADER + 128)
144 * The list of packet types we will receive (as opposed to discard)
145 * and the routines to invoke.
147 * Why 16. Because with 16 the only overlap we get on a hash of the
148 * low nibble of the protocol value is RARP/SNAP/X.25.
150 * NOTE: That is no longer true with the addition of VLAN tags. Not
151 * sure which should go first, but I bet it won't make much
152 * difference if we are running VLANs. The good news is that
153 * this protocol won't be in the list unless compiled in, so
154 * the average user (w/out VLANs) will not be adversely affected.
171 #define PTYPE_HASH_SIZE (16)
172 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
174 static DEFINE_SPINLOCK(ptype_lock);
175 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
176 static struct list_head ptype_all __read_mostly; /* Taps */
179 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
182 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
184 * Writers must hold the rtnl semaphore while they loop through the
185 * dev_base_head list, and hold dev_base_lock for writing when they do the
186 * actual updates. This allows pure readers to access the list even
187 * while a writer is preparing to update it.
189 * To put it another way, dev_base_lock is held for writing only to
190 * protect against pure readers; the rtnl semaphore provides the
191 * protection against other writers.
193 * See, for example usages, register_netdevice() and
194 * unregister_netdevice(), which must be called with the rtnl
197 DEFINE_RWLOCK(dev_base_lock);
198 EXPORT_SYMBOL(dev_base_lock);
200 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
202 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
203 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
206 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
208 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
211 static inline void rps_lock(struct softnet_data *sd)
214 spin_lock(&sd->input_pkt_queue.lock);
218 static inline void rps_unlock(struct softnet_data *sd)
221 spin_unlock(&sd->input_pkt_queue.lock);
225 /* Device list insertion */
226 static int list_netdevice(struct net_device *dev)
228 struct net *net = dev_net(dev);
232 write_lock_bh(&dev_base_lock);
233 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
234 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
235 hlist_add_head_rcu(&dev->index_hlist,
236 dev_index_hash(net, dev->ifindex));
237 write_unlock_bh(&dev_base_lock);
241 /* Device list removal
242 * caller must respect a RCU grace period before freeing/reusing dev
244 static void unlist_netdevice(struct net_device *dev)
248 /* Unlink dev from the device chain */
249 write_lock_bh(&dev_base_lock);
250 list_del_rcu(&dev->dev_list);
251 hlist_del_rcu(&dev->name_hlist);
252 hlist_del_rcu(&dev->index_hlist);
253 write_unlock_bh(&dev_base_lock);
260 static RAW_NOTIFIER_HEAD(netdev_chain);
263 * Device drivers call our routines to queue packets here. We empty the
264 * queue in the local softnet handler.
267 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
268 EXPORT_PER_CPU_SYMBOL(softnet_data);
270 #ifdef CONFIG_LOCKDEP
272 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
273 * according to dev->type
275 static const unsigned short netdev_lock_type[] =
276 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
277 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
278 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
279 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
280 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
281 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
282 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
283 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
284 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
285 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
286 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
287 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
288 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
289 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
290 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
291 ARPHRD_VOID, ARPHRD_NONE};
293 static const char *const netdev_lock_name[] =
294 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
295 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
296 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
297 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
298 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
299 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
300 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
301 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
302 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
303 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
304 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
305 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
306 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
307 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
308 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
309 "_xmit_VOID", "_xmit_NONE"};
311 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
312 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
314 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
318 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
319 if (netdev_lock_type[i] == dev_type)
321 /* the last key is used by default */
322 return ARRAY_SIZE(netdev_lock_type) - 1;
325 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
326 unsigned short dev_type)
330 i = netdev_lock_pos(dev_type);
331 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
332 netdev_lock_name[i]);
335 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
339 i = netdev_lock_pos(dev->type);
340 lockdep_set_class_and_name(&dev->addr_list_lock,
341 &netdev_addr_lock_key[i],
342 netdev_lock_name[i]);
345 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
346 unsigned short dev_type)
349 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
354 /*******************************************************************************
356 Protocol management and registration routines
358 *******************************************************************************/
361 * Add a protocol ID to the list. Now that the input handler is
362 * smarter we can dispense with all the messy stuff that used to be
365 * BEWARE!!! Protocol handlers, mangling input packets,
366 * MUST BE last in hash buckets and checking protocol handlers
367 * MUST start from promiscuous ptype_all chain in net_bh.
368 * It is true now, do not change it.
369 * Explanation follows: if protocol handler, mangling packet, will
370 * be the first on list, it is not able to sense, that packet
371 * is cloned and should be copied-on-write, so that it will
372 * change it and subsequent readers will get broken packet.
377 * dev_add_pack - add packet handler
378 * @pt: packet type declaration
380 * Add a protocol handler to the networking stack. The passed &packet_type
381 * is linked into kernel lists and may not be freed until it has been
382 * removed from the kernel lists.
384 * This call does not sleep therefore it can not
385 * guarantee all CPU's that are in middle of receiving packets
386 * will see the new packet type (until the next received packet).
389 void dev_add_pack(struct packet_type *pt)
393 spin_lock_bh(&ptype_lock);
394 if (pt->type == htons(ETH_P_ALL))
395 list_add_rcu(&pt->list, &ptype_all);
397 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
398 list_add_rcu(&pt->list, &ptype_base[hash]);
400 spin_unlock_bh(&ptype_lock);
402 EXPORT_SYMBOL(dev_add_pack);
405 * __dev_remove_pack - remove packet handler
406 * @pt: packet type declaration
408 * Remove a protocol handler that was previously added to the kernel
409 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
410 * from the kernel lists and can be freed or reused once this function
413 * The packet type might still be in use by receivers
414 * and must not be freed until after all the CPU's have gone
415 * through a quiescent state.
417 void __dev_remove_pack(struct packet_type *pt)
419 struct list_head *head;
420 struct packet_type *pt1;
422 spin_lock_bh(&ptype_lock);
424 if (pt->type == htons(ETH_P_ALL))
427 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
429 list_for_each_entry(pt1, head, list) {
431 list_del_rcu(&pt->list);
436 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
438 spin_unlock_bh(&ptype_lock);
440 EXPORT_SYMBOL(__dev_remove_pack);
443 * dev_remove_pack - remove packet handler
444 * @pt: packet type declaration
446 * Remove a protocol handler that was previously added to the kernel
447 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
448 * from the kernel lists and can be freed or reused once this function
451 * This call sleeps to guarantee that no CPU is looking at the packet
454 void dev_remove_pack(struct packet_type *pt)
456 __dev_remove_pack(pt);
460 EXPORT_SYMBOL(dev_remove_pack);
462 /******************************************************************************
464 Device Boot-time Settings Routines
466 *******************************************************************************/
468 /* Boot time configuration table */
469 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
472 * netdev_boot_setup_add - add new setup entry
473 * @name: name of the device
474 * @map: configured settings for the device
476 * Adds new setup entry to the dev_boot_setup list. The function
477 * returns 0 on error and 1 on success. This is a generic routine to
480 static int netdev_boot_setup_add(char *name, struct ifmap *map)
482 struct netdev_boot_setup *s;
486 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
487 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
488 memset(s[i].name, 0, sizeof(s[i].name));
489 strlcpy(s[i].name, name, IFNAMSIZ);
490 memcpy(&s[i].map, map, sizeof(s[i].map));
495 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
499 * netdev_boot_setup_check - check boot time settings
500 * @dev: the netdevice
502 * Check boot time settings for the device.
503 * The found settings are set for the device to be used
504 * later in the device probing.
505 * Returns 0 if no settings found, 1 if they are.
507 int netdev_boot_setup_check(struct net_device *dev)
509 struct netdev_boot_setup *s = dev_boot_setup;
512 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
513 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
514 !strcmp(dev->name, s[i].name)) {
515 dev->irq = s[i].map.irq;
516 dev->base_addr = s[i].map.base_addr;
517 dev->mem_start = s[i].map.mem_start;
518 dev->mem_end = s[i].map.mem_end;
524 EXPORT_SYMBOL(netdev_boot_setup_check);
528 * netdev_boot_base - get address from boot time settings
529 * @prefix: prefix for network device
530 * @unit: id for network device
532 * Check boot time settings for the base address of device.
533 * The found settings are set for the device to be used
534 * later in the device probing.
535 * Returns 0 if no settings found.
537 unsigned long netdev_boot_base(const char *prefix, int unit)
539 const struct netdev_boot_setup *s = dev_boot_setup;
543 sprintf(name, "%s%d", prefix, unit);
546 * If device already registered then return base of 1
547 * to indicate not to probe for this interface
549 if (__dev_get_by_name(&init_net, name))
552 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
553 if (!strcmp(name, s[i].name))
554 return s[i].map.base_addr;
559 * Saves at boot time configured settings for any netdevice.
561 int __init netdev_boot_setup(char *str)
566 str = get_options(str, ARRAY_SIZE(ints), ints);
571 memset(&map, 0, sizeof(map));
575 map.base_addr = ints[2];
577 map.mem_start = ints[3];
579 map.mem_end = ints[4];
581 /* Add new entry to the list */
582 return netdev_boot_setup_add(str, &map);
585 __setup("netdev=", netdev_boot_setup);
587 /*******************************************************************************
589 Device Interface Subroutines
591 *******************************************************************************/
594 * __dev_get_by_name - find a device by its name
595 * @net: the applicable net namespace
596 * @name: name to find
598 * Find an interface by name. Must be called under RTNL semaphore
599 * or @dev_base_lock. If the name is found a pointer to the device
600 * is returned. If the name is not found then %NULL is returned. The
601 * reference counters are not incremented so the caller must be
602 * careful with locks.
605 struct net_device *__dev_get_by_name(struct net *net, const char *name)
607 struct hlist_node *p;
608 struct net_device *dev;
609 struct hlist_head *head = dev_name_hash(net, name);
611 hlist_for_each_entry(dev, p, head, name_hlist)
612 if (!strncmp(dev->name, name, IFNAMSIZ))
617 EXPORT_SYMBOL(__dev_get_by_name);
620 * dev_get_by_name_rcu - find a device by its name
621 * @net: the applicable net namespace
622 * @name: name to find
624 * Find an interface by name.
625 * If the name is found a pointer to the device is returned.
626 * If the name is not found then %NULL is returned.
627 * The reference counters are not incremented so the caller must be
628 * careful with locks. The caller must hold RCU lock.
631 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
633 struct hlist_node *p;
634 struct net_device *dev;
635 struct hlist_head *head = dev_name_hash(net, name);
637 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
638 if (!strncmp(dev->name, name, IFNAMSIZ))
643 EXPORT_SYMBOL(dev_get_by_name_rcu);
646 * dev_get_by_name - find a device by its name
647 * @net: the applicable net namespace
648 * @name: name to find
650 * Find an interface by name. This can be called from any
651 * context and does its own locking. The returned handle has
652 * the usage count incremented and the caller must use dev_put() to
653 * release it when it is no longer needed. %NULL is returned if no
654 * matching device is found.
657 struct net_device *dev_get_by_name(struct net *net, const char *name)
659 struct net_device *dev;
662 dev = dev_get_by_name_rcu(net, name);
668 EXPORT_SYMBOL(dev_get_by_name);
671 * __dev_get_by_index - find a device by its ifindex
672 * @net: the applicable net namespace
673 * @ifindex: index of device
675 * Search for an interface by index. Returns %NULL if the device
676 * is not found or a pointer to the device. The device has not
677 * had its reference counter increased so the caller must be careful
678 * about locking. The caller must hold either the RTNL semaphore
682 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
684 struct hlist_node *p;
685 struct net_device *dev;
686 struct hlist_head *head = dev_index_hash(net, ifindex);
688 hlist_for_each_entry(dev, p, head, index_hlist)
689 if (dev->ifindex == ifindex)
694 EXPORT_SYMBOL(__dev_get_by_index);
697 * dev_get_by_index_rcu - find a device by its ifindex
698 * @net: the applicable net namespace
699 * @ifindex: index of device
701 * Search for an interface by index. Returns %NULL if the device
702 * is not found or a pointer to the device. The device has not
703 * had its reference counter increased so the caller must be careful
704 * about locking. The caller must hold RCU lock.
707 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
709 struct hlist_node *p;
710 struct net_device *dev;
711 struct hlist_head *head = dev_index_hash(net, ifindex);
713 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
714 if (dev->ifindex == ifindex)
719 EXPORT_SYMBOL(dev_get_by_index_rcu);
723 * dev_get_by_index - find a device by its ifindex
724 * @net: the applicable net namespace
725 * @ifindex: index of device
727 * Search for an interface by index. Returns NULL if the device
728 * is not found or a pointer to the device. The device returned has
729 * had a reference added and the pointer is safe until the user calls
730 * dev_put to indicate they have finished with it.
733 struct net_device *dev_get_by_index(struct net *net, int ifindex)
735 struct net_device *dev;
738 dev = dev_get_by_index_rcu(net, ifindex);
744 EXPORT_SYMBOL(dev_get_by_index);
747 * dev_getbyhwaddr - find a device by its hardware address
748 * @net: the applicable net namespace
749 * @type: media type of device
750 * @ha: hardware address
752 * Search for an interface by MAC address. Returns NULL if the device
753 * is not found or a pointer to the device. The caller must hold the
754 * rtnl semaphore. The returned device has not had its ref count increased
755 * and the caller must therefore be careful about locking
758 * If the API was consistent this would be __dev_get_by_hwaddr
761 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
763 struct net_device *dev;
767 for_each_netdev(net, dev)
768 if (dev->type == type &&
769 !memcmp(dev->dev_addr, ha, dev->addr_len))
774 EXPORT_SYMBOL(dev_getbyhwaddr);
776 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
778 struct net_device *dev;
781 for_each_netdev(net, dev)
782 if (dev->type == type)
787 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
789 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
791 struct net_device *dev, *ret = NULL;
794 for_each_netdev_rcu(net, dev)
795 if (dev->type == type) {
803 EXPORT_SYMBOL(dev_getfirstbyhwtype);
806 * dev_get_by_flags - find any device with given flags
807 * @net: the applicable net namespace
808 * @if_flags: IFF_* values
809 * @mask: bitmask of bits in if_flags to check
811 * Search for any interface with the given flags. Returns NULL if a device
812 * is not found or a pointer to the device. The device returned has
813 * had a reference added and the pointer is safe until the user calls
814 * dev_put to indicate they have finished with it.
817 struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
820 struct net_device *dev, *ret;
824 for_each_netdev_rcu(net, dev) {
825 if (((dev->flags ^ if_flags) & mask) == 0) {
834 EXPORT_SYMBOL(dev_get_by_flags);
837 * dev_valid_name - check if name is okay for network device
840 * Network device names need to be valid file names to
841 * to allow sysfs to work. We also disallow any kind of
844 int dev_valid_name(const char *name)
848 if (strlen(name) >= IFNAMSIZ)
850 if (!strcmp(name, ".") || !strcmp(name, ".."))
854 if (*name == '/' || isspace(*name))
860 EXPORT_SYMBOL(dev_valid_name);
863 * __dev_alloc_name - allocate a name for a device
864 * @net: network namespace to allocate the device name in
865 * @name: name format string
866 * @buf: scratch buffer and result name string
868 * Passed a format string - eg "lt%d" it will try and find a suitable
869 * id. It scans list of devices to build up a free map, then chooses
870 * the first empty slot. The caller must hold the dev_base or rtnl lock
871 * while allocating the name and adding the device in order to avoid
873 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
874 * Returns the number of the unit assigned or a negative errno code.
877 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
881 const int max_netdevices = 8*PAGE_SIZE;
882 unsigned long *inuse;
883 struct net_device *d;
885 p = strnchr(name, IFNAMSIZ-1, '%');
888 * Verify the string as this thing may have come from
889 * the user. There must be either one "%d" and no other "%"
892 if (p[1] != 'd' || strchr(p + 2, '%'))
895 /* Use one page as a bit array of possible slots */
896 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
900 for_each_netdev(net, d) {
901 if (!sscanf(d->name, name, &i))
903 if (i < 0 || i >= max_netdevices)
906 /* avoid cases where sscanf is not exact inverse of printf */
907 snprintf(buf, IFNAMSIZ, name, i);
908 if (!strncmp(buf, d->name, IFNAMSIZ))
912 i = find_first_zero_bit(inuse, max_netdevices);
913 free_page((unsigned long) inuse);
917 snprintf(buf, IFNAMSIZ, name, i);
918 if (!__dev_get_by_name(net, buf))
921 /* It is possible to run out of possible slots
922 * when the name is long and there isn't enough space left
923 * for the digits, or if all bits are used.
929 * dev_alloc_name - allocate a name for a device
931 * @name: name format string
933 * Passed a format string - eg "lt%d" it will try and find a suitable
934 * id. It scans list of devices to build up a free map, then chooses
935 * the first empty slot. The caller must hold the dev_base or rtnl lock
936 * while allocating the name and adding the device in order to avoid
938 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
939 * Returns the number of the unit assigned or a negative errno code.
942 int dev_alloc_name(struct net_device *dev, const char *name)
948 BUG_ON(!dev_net(dev));
950 ret = __dev_alloc_name(net, name, buf);
952 strlcpy(dev->name, buf, IFNAMSIZ);
955 EXPORT_SYMBOL(dev_alloc_name);
957 static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt)
961 BUG_ON(!dev_net(dev));
964 if (!dev_valid_name(name))
967 if (fmt && strchr(name, '%'))
968 return dev_alloc_name(dev, name);
969 else if (__dev_get_by_name(net, name))
971 else if (dev->name != name)
972 strlcpy(dev->name, name, IFNAMSIZ);
978 * dev_change_name - change name of a device
980 * @newname: name (or format string) must be at least IFNAMSIZ
982 * Change name of a device, can pass format strings "eth%d".
985 int dev_change_name(struct net_device *dev, const char *newname)
987 char oldname[IFNAMSIZ];
993 BUG_ON(!dev_net(dev));
996 if (dev->flags & IFF_UP)
999 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
1002 memcpy(oldname, dev->name, IFNAMSIZ);
1004 err = dev_get_valid_name(dev, newname, 1);
1009 ret = device_rename(&dev->dev, dev->name);
1011 memcpy(dev->name, oldname, IFNAMSIZ);
1015 write_lock_bh(&dev_base_lock);
1016 hlist_del(&dev->name_hlist);
1017 write_unlock_bh(&dev_base_lock);
1021 write_lock_bh(&dev_base_lock);
1022 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1023 write_unlock_bh(&dev_base_lock);
1025 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1026 ret = notifier_to_errno(ret);
1029 /* err >= 0 after dev_alloc_name() or stores the first errno */
1032 memcpy(dev->name, oldname, IFNAMSIZ);
1036 "%s: name change rollback failed: %d.\n",
1045 * dev_set_alias - change ifalias of a device
1047 * @alias: name up to IFALIASZ
1048 * @len: limit of bytes to copy from info
1050 * Set ifalias for a device,
1052 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1056 if (len >= IFALIASZ)
1061 kfree(dev->ifalias);
1062 dev->ifalias = NULL;
1067 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1071 strlcpy(dev->ifalias, alias, len+1);
1077 * netdev_features_change - device changes features
1078 * @dev: device to cause notification
1080 * Called to indicate a device has changed features.
1082 void netdev_features_change(struct net_device *dev)
1084 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1086 EXPORT_SYMBOL(netdev_features_change);
1089 * netdev_state_change - device changes state
1090 * @dev: device to cause notification
1092 * Called to indicate a device has changed state. This function calls
1093 * the notifier chains for netdev_chain and sends a NEWLINK message
1094 * to the routing socket.
1096 void netdev_state_change(struct net_device *dev)
1098 if (dev->flags & IFF_UP) {
1099 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1100 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1103 EXPORT_SYMBOL(netdev_state_change);
1105 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1107 return call_netdevice_notifiers(event, dev);
1109 EXPORT_SYMBOL(netdev_bonding_change);
1112 * dev_load - load a network module
1113 * @net: the applicable net namespace
1114 * @name: name of interface
1116 * If a network interface is not present and the process has suitable
1117 * privileges this function loads the module. If module loading is not
1118 * available in this kernel then it becomes a nop.
1121 void dev_load(struct net *net, const char *name)
1123 struct net_device *dev;
1126 dev = dev_get_by_name_rcu(net, name);
1129 if (!dev && capable(CAP_NET_ADMIN))
1130 request_module("%s", name);
1132 EXPORT_SYMBOL(dev_load);
1134 static int __dev_open(struct net_device *dev)
1136 const struct net_device_ops *ops = dev->netdev_ops;
1142 * Is it even present?
1144 if (!netif_device_present(dev))
1147 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1148 ret = notifier_to_errno(ret);
1153 * Call device private open method
1155 set_bit(__LINK_STATE_START, &dev->state);
1157 if (ops->ndo_validate_addr)
1158 ret = ops->ndo_validate_addr(dev);
1160 if (!ret && ops->ndo_open)
1161 ret = ops->ndo_open(dev);
1164 * If it went open OK then:
1168 clear_bit(__LINK_STATE_START, &dev->state);
1173 dev->flags |= IFF_UP;
1178 net_dmaengine_get();
1181 * Initialize multicasting status
1183 dev_set_rx_mode(dev);
1186 * Wakeup transmit queue engine
1195 * dev_open - prepare an interface for use.
1196 * @dev: device to open
1198 * Takes a device from down to up state. The device's private open
1199 * function is invoked and then the multicast lists are loaded. Finally
1200 * the device is moved into the up state and a %NETDEV_UP message is
1201 * sent to the netdev notifier chain.
1203 * Calling this function on an active interface is a nop. On a failure
1204 * a negative errno code is returned.
1206 int dev_open(struct net_device *dev)
1213 if (dev->flags & IFF_UP)
1219 ret = __dev_open(dev);
1224 * ... and announce new interface.
1226 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1227 call_netdevice_notifiers(NETDEV_UP, dev);
1231 EXPORT_SYMBOL(dev_open);
1233 static int __dev_close(struct net_device *dev)
1235 const struct net_device_ops *ops = dev->netdev_ops;
1241 * Tell people we are going down, so that they can
1242 * prepare to death, when device is still operating.
1244 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1246 clear_bit(__LINK_STATE_START, &dev->state);
1248 /* Synchronize to scheduled poll. We cannot touch poll list,
1249 * it can be even on different cpu. So just clear netif_running().
1251 * dev->stop() will invoke napi_disable() on all of it's
1252 * napi_struct instances on this device.
1254 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1256 dev_deactivate(dev);
1259 * Call the device specific close. This cannot fail.
1260 * Only if device is UP
1262 * We allow it to be called even after a DETACH hot-plug
1269 * Device is now down.
1272 dev->flags &= ~IFF_UP;
1277 net_dmaengine_put();
1283 * dev_close - shutdown an interface.
1284 * @dev: device to shutdown
1286 * This function moves an active device into down state. A
1287 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1288 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1291 int dev_close(struct net_device *dev)
1293 if (!(dev->flags & IFF_UP))
1299 * Tell people we are down
1301 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1302 call_netdevice_notifiers(NETDEV_DOWN, dev);
1306 EXPORT_SYMBOL(dev_close);
1310 * dev_disable_lro - disable Large Receive Offload on a device
1313 * Disable Large Receive Offload (LRO) on a net device. Must be
1314 * called under RTNL. This is needed if received packets may be
1315 * forwarded to another interface.
1317 void dev_disable_lro(struct net_device *dev)
1319 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1320 dev->ethtool_ops->set_flags) {
1321 u32 flags = dev->ethtool_ops->get_flags(dev);
1322 if (flags & ETH_FLAG_LRO) {
1323 flags &= ~ETH_FLAG_LRO;
1324 dev->ethtool_ops->set_flags(dev, flags);
1327 WARN_ON(dev->features & NETIF_F_LRO);
1329 EXPORT_SYMBOL(dev_disable_lro);
1332 static int dev_boot_phase = 1;
1335 * Device change register/unregister. These are not inline or static
1336 * as we export them to the world.
1340 * register_netdevice_notifier - register a network notifier block
1343 * Register a notifier to be called when network device events occur.
1344 * The notifier passed is linked into the kernel structures and must
1345 * not be reused until it has been unregistered. A negative errno code
1346 * is returned on a failure.
1348 * When registered all registration and up events are replayed
1349 * to the new notifier to allow device to have a race free
1350 * view of the network device list.
1353 int register_netdevice_notifier(struct notifier_block *nb)
1355 struct net_device *dev;
1356 struct net_device *last;
1361 err = raw_notifier_chain_register(&netdev_chain, nb);
1367 for_each_netdev(net, dev) {
1368 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1369 err = notifier_to_errno(err);
1373 if (!(dev->flags & IFF_UP))
1376 nb->notifier_call(nb, NETDEV_UP, dev);
1387 for_each_netdev(net, dev) {
1391 if (dev->flags & IFF_UP) {
1392 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1393 nb->notifier_call(nb, NETDEV_DOWN, dev);
1395 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1396 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1400 raw_notifier_chain_unregister(&netdev_chain, nb);
1403 EXPORT_SYMBOL(register_netdevice_notifier);
1406 * unregister_netdevice_notifier - unregister a network notifier block
1409 * Unregister a notifier previously registered by
1410 * register_netdevice_notifier(). The notifier is unlinked into the
1411 * kernel structures and may then be reused. A negative errno code
1412 * is returned on a failure.
1415 int unregister_netdevice_notifier(struct notifier_block *nb)
1420 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1424 EXPORT_SYMBOL(unregister_netdevice_notifier);
1427 * call_netdevice_notifiers - call all network notifier blocks
1428 * @val: value passed unmodified to notifier function
1429 * @dev: net_device pointer passed unmodified to notifier function
1431 * Call all network notifier blocks. Parameters and return value
1432 * are as for raw_notifier_call_chain().
1435 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1438 return raw_notifier_call_chain(&netdev_chain, val, dev);
1441 /* When > 0 there are consumers of rx skb time stamps */
1442 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1444 void net_enable_timestamp(void)
1446 atomic_inc(&netstamp_needed);
1448 EXPORT_SYMBOL(net_enable_timestamp);
1450 void net_disable_timestamp(void)
1452 atomic_dec(&netstamp_needed);
1454 EXPORT_SYMBOL(net_disable_timestamp);
1456 static inline void net_timestamp_set(struct sk_buff *skb)
1458 if (atomic_read(&netstamp_needed))
1459 __net_timestamp(skb);
1461 skb->tstamp.tv64 = 0;
1464 static inline void net_timestamp_check(struct sk_buff *skb)
1466 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1467 __net_timestamp(skb);
1471 * dev_forward_skb - loopback an skb to another netif
1473 * @dev: destination network device
1474 * @skb: buffer to forward
1477 * NET_RX_SUCCESS (no congestion)
1478 * NET_RX_DROP (packet was dropped, but freed)
1480 * dev_forward_skb can be used for injecting an skb from the
1481 * start_xmit function of one device into the receive queue
1482 * of another device.
1484 * The receiving device may be in another namespace, so
1485 * we have to clear all information in the skb that could
1486 * impact namespace isolation.
1488 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1492 if (!(dev->flags & IFF_UP) ||
1493 (skb->len > (dev->mtu + dev->hard_header_len))) {
1497 skb_set_dev(skb, dev);
1498 skb->tstamp.tv64 = 0;
1499 skb->pkt_type = PACKET_HOST;
1500 skb->protocol = eth_type_trans(skb, dev);
1501 return netif_rx(skb);
1503 EXPORT_SYMBOL_GPL(dev_forward_skb);
1506 * Support routine. Sends outgoing frames to any network
1507 * taps currently in use.
1510 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1512 struct packet_type *ptype;
1514 #ifdef CONFIG_NET_CLS_ACT
1515 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1516 net_timestamp_set(skb);
1518 net_timestamp_set(skb);
1522 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1523 /* Never send packets back to the socket
1524 * they originated from - MvS (miquels@drinkel.ow.org)
1526 if ((ptype->dev == dev || !ptype->dev) &&
1527 (ptype->af_packet_priv == NULL ||
1528 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1529 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1533 /* skb->nh should be correctly
1534 set by sender, so that the second statement is
1535 just protection against buggy protocols.
1537 skb_reset_mac_header(skb2);
1539 if (skb_network_header(skb2) < skb2->data ||
1540 skb2->network_header > skb2->tail) {
1541 if (net_ratelimit())
1542 printk(KERN_CRIT "protocol %04x is "
1544 skb2->protocol, dev->name);
1545 skb_reset_network_header(skb2);
1548 skb2->transport_header = skb2->network_header;
1549 skb2->pkt_type = PACKET_OUTGOING;
1550 ptype->func(skb2, skb->dev, ptype, skb->dev);
1557 static inline void __netif_reschedule(struct Qdisc *q)
1559 struct softnet_data *sd;
1560 unsigned long flags;
1562 local_irq_save(flags);
1563 sd = &__get_cpu_var(softnet_data);
1564 q->next_sched = NULL;
1565 *sd->output_queue_tailp = q;
1566 sd->output_queue_tailp = &q->next_sched;
1567 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1568 local_irq_restore(flags);
1571 void __netif_schedule(struct Qdisc *q)
1573 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1574 __netif_reschedule(q);
1576 EXPORT_SYMBOL(__netif_schedule);
1578 void dev_kfree_skb_irq(struct sk_buff *skb)
1580 if (atomic_dec_and_test(&skb->users)) {
1581 struct softnet_data *sd;
1582 unsigned long flags;
1584 local_irq_save(flags);
1585 sd = &__get_cpu_var(softnet_data);
1586 skb->next = sd->completion_queue;
1587 sd->completion_queue = skb;
1588 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1589 local_irq_restore(flags);
1592 EXPORT_SYMBOL(dev_kfree_skb_irq);
1594 void dev_kfree_skb_any(struct sk_buff *skb)
1596 if (in_irq() || irqs_disabled())
1597 dev_kfree_skb_irq(skb);
1601 EXPORT_SYMBOL(dev_kfree_skb_any);
1605 * netif_device_detach - mark device as removed
1606 * @dev: network device
1608 * Mark device as removed from system and therefore no longer available.
1610 void netif_device_detach(struct net_device *dev)
1612 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1613 netif_running(dev)) {
1614 netif_tx_stop_all_queues(dev);
1617 EXPORT_SYMBOL(netif_device_detach);
1620 * netif_device_attach - mark device as attached
1621 * @dev: network device
1623 * Mark device as attached from system and restart if needed.
1625 void netif_device_attach(struct net_device *dev)
1627 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1628 netif_running(dev)) {
1629 netif_tx_wake_all_queues(dev);
1630 __netdev_watchdog_up(dev);
1633 EXPORT_SYMBOL(netif_device_attach);
1635 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1637 return ((features & NETIF_F_GEN_CSUM) ||
1638 ((features & NETIF_F_IP_CSUM) &&
1639 protocol == htons(ETH_P_IP)) ||
1640 ((features & NETIF_F_IPV6_CSUM) &&
1641 protocol == htons(ETH_P_IPV6)) ||
1642 ((features & NETIF_F_FCOE_CRC) &&
1643 protocol == htons(ETH_P_FCOE)));
1646 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1648 if (can_checksum_protocol(dev->features, skb->protocol))
1651 if (skb->protocol == htons(ETH_P_8021Q)) {
1652 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1653 if (can_checksum_protocol(dev->features & dev->vlan_features,
1654 veh->h_vlan_encapsulated_proto))
1662 * skb_dev_set -- assign a new device to a buffer
1663 * @skb: buffer for the new device
1664 * @dev: network device
1666 * If an skb is owned by a device already, we have to reset
1667 * all data private to the namespace a device belongs to
1668 * before assigning it a new device.
1670 #ifdef CONFIG_NET_NS
1671 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1674 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1677 skb_init_secmark(skb);
1681 skb->ipvs_property = 0;
1682 #ifdef CONFIG_NET_SCHED
1688 EXPORT_SYMBOL(skb_set_dev);
1689 #endif /* CONFIG_NET_NS */
1692 * Invalidate hardware checksum when packet is to be mangled, and
1693 * complete checksum manually on outgoing path.
1695 int skb_checksum_help(struct sk_buff *skb)
1698 int ret = 0, offset;
1700 if (skb->ip_summed == CHECKSUM_COMPLETE)
1701 goto out_set_summed;
1703 if (unlikely(skb_shinfo(skb)->gso_size)) {
1704 /* Let GSO fix up the checksum. */
1705 goto out_set_summed;
1708 offset = skb->csum_start - skb_headroom(skb);
1709 BUG_ON(offset >= skb_headlen(skb));
1710 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1712 offset += skb->csum_offset;
1713 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1715 if (skb_cloned(skb) &&
1716 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1717 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1722 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1724 skb->ip_summed = CHECKSUM_NONE;
1728 EXPORT_SYMBOL(skb_checksum_help);
1731 * skb_gso_segment - Perform segmentation on skb.
1732 * @skb: buffer to segment
1733 * @features: features for the output path (see dev->features)
1735 * This function segments the given skb and returns a list of segments.
1737 * It may return NULL if the skb requires no segmentation. This is
1738 * only possible when GSO is used for verifying header integrity.
1740 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1742 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1743 struct packet_type *ptype;
1744 __be16 type = skb->protocol;
1747 skb_reset_mac_header(skb);
1748 skb->mac_len = skb->network_header - skb->mac_header;
1749 __skb_pull(skb, skb->mac_len);
1751 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1752 struct net_device *dev = skb->dev;
1753 struct ethtool_drvinfo info = {};
1755 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1756 dev->ethtool_ops->get_drvinfo(dev, &info);
1758 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1760 info.driver, dev ? dev->features : 0L,
1761 skb->sk ? skb->sk->sk_route_caps : 0L,
1762 skb->len, skb->data_len, skb->ip_summed);
1764 if (skb_header_cloned(skb) &&
1765 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1766 return ERR_PTR(err);
1770 list_for_each_entry_rcu(ptype,
1771 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1772 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1773 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1774 err = ptype->gso_send_check(skb);
1775 segs = ERR_PTR(err);
1776 if (err || skb_gso_ok(skb, features))
1778 __skb_push(skb, (skb->data -
1779 skb_network_header(skb)));
1781 segs = ptype->gso_segment(skb, features);
1787 __skb_push(skb, skb->data - skb_mac_header(skb));
1791 EXPORT_SYMBOL(skb_gso_segment);
1793 /* Take action when hardware reception checksum errors are detected. */
1795 void netdev_rx_csum_fault(struct net_device *dev)
1797 if (net_ratelimit()) {
1798 printk(KERN_ERR "%s: hw csum failure.\n",
1799 dev ? dev->name : "<unknown>");
1803 EXPORT_SYMBOL(netdev_rx_csum_fault);
1806 /* Actually, we should eliminate this check as soon as we know, that:
1807 * 1. IOMMU is present and allows to map all the memory.
1808 * 2. No high memory really exists on this machine.
1811 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1813 #ifdef CONFIG_HIGHMEM
1815 if (!(dev->features & NETIF_F_HIGHDMA)) {
1816 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1817 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1821 if (PCI_DMA_BUS_IS_PHYS) {
1822 struct device *pdev = dev->dev.parent;
1826 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1827 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1828 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1837 void (*destructor)(struct sk_buff *skb);
1840 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1842 static void dev_gso_skb_destructor(struct sk_buff *skb)
1844 struct dev_gso_cb *cb;
1847 struct sk_buff *nskb = skb->next;
1849 skb->next = nskb->next;
1852 } while (skb->next);
1854 cb = DEV_GSO_CB(skb);
1856 cb->destructor(skb);
1860 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1861 * @skb: buffer to segment
1863 * This function segments the given skb and stores the list of segments
1866 static int dev_gso_segment(struct sk_buff *skb)
1868 struct net_device *dev = skb->dev;
1869 struct sk_buff *segs;
1870 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1873 segs = skb_gso_segment(skb, features);
1875 /* Verifying header integrity only. */
1880 return PTR_ERR(segs);
1883 DEV_GSO_CB(skb)->destructor = skb->destructor;
1884 skb->destructor = dev_gso_skb_destructor;
1890 * Try to orphan skb early, right before transmission by the device.
1891 * We cannot orphan skb if tx timestamp is requested, since
1892 * drivers need to call skb_tstamp_tx() to send the timestamp.
1894 static inline void skb_orphan_try(struct sk_buff *skb)
1896 if (!skb_tx(skb)->flags)
1900 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1901 struct netdev_queue *txq)
1903 const struct net_device_ops *ops = dev->netdev_ops;
1904 int rc = NETDEV_TX_OK;
1906 if (likely(!skb->next)) {
1907 if (!list_empty(&ptype_all))
1908 dev_queue_xmit_nit(skb, dev);
1911 * If device doesnt need skb->dst, release it right now while
1912 * its hot in this cpu cache
1914 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1917 skb_orphan_try(skb);
1919 if (netif_needs_gso(dev, skb)) {
1920 if (unlikely(dev_gso_segment(skb)))
1926 rc = ops->ndo_start_xmit(skb, dev);
1927 if (rc == NETDEV_TX_OK)
1928 txq_trans_update(txq);
1934 struct sk_buff *nskb = skb->next;
1936 skb->next = nskb->next;
1940 * If device doesnt need nskb->dst, release it right now while
1941 * its hot in this cpu cache
1943 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1946 rc = ops->ndo_start_xmit(nskb, dev);
1947 if (unlikely(rc != NETDEV_TX_OK)) {
1948 if (rc & ~NETDEV_TX_MASK)
1949 goto out_kfree_gso_skb;
1950 nskb->next = skb->next;
1954 txq_trans_update(txq);
1955 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1956 return NETDEV_TX_BUSY;
1957 } while (skb->next);
1960 if (likely(skb->next == NULL))
1961 skb->destructor = DEV_GSO_CB(skb)->destructor;
1967 static u32 hashrnd __read_mostly;
1969 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1973 if (skb_rx_queue_recorded(skb)) {
1974 hash = skb_get_rx_queue(skb);
1975 while (unlikely(hash >= dev->real_num_tx_queues))
1976 hash -= dev->real_num_tx_queues;
1980 if (skb->sk && skb->sk->sk_hash)
1981 hash = skb->sk->sk_hash;
1983 hash = (__force u16) skb->protocol;
1985 hash = jhash_1word(hash, hashrnd);
1987 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1989 EXPORT_SYMBOL(skb_tx_hash);
1991 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
1993 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
1994 if (net_ratelimit()) {
1995 pr_warning("%s selects TX queue %d, but "
1996 "real number of TX queues is %d\n",
1997 dev->name, queue_index, dev->real_num_tx_queues);
2004 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2005 struct sk_buff *skb)
2008 struct sock *sk = skb->sk;
2010 if (sk_tx_queue_recorded(sk)) {
2011 queue_index = sk_tx_queue_get(sk);
2013 const struct net_device_ops *ops = dev->netdev_ops;
2015 if (ops->ndo_select_queue) {
2016 queue_index = ops->ndo_select_queue(dev, skb);
2017 queue_index = dev_cap_txqueue(dev, queue_index);
2020 if (dev->real_num_tx_queues > 1)
2021 queue_index = skb_tx_hash(dev, skb);
2024 struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
2026 if (dst && skb_dst(skb) == dst)
2027 sk_tx_queue_set(sk, queue_index);
2032 skb_set_queue_mapping(skb, queue_index);
2033 return netdev_get_tx_queue(dev, queue_index);
2036 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2037 struct net_device *dev,
2038 struct netdev_queue *txq)
2040 spinlock_t *root_lock = qdisc_lock(q);
2043 spin_lock(root_lock);
2044 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2047 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2048 !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
2050 * This is a work-conserving queue; there are no old skbs
2051 * waiting to be sent out; and the qdisc is not running -
2052 * xmit the skb directly.
2054 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2056 __qdisc_update_bstats(q, skb->len);
2057 if (sch_direct_xmit(skb, q, dev, txq, root_lock))
2060 clear_bit(__QDISC_STATE_RUNNING, &q->state);
2062 rc = NET_XMIT_SUCCESS;
2065 rc = qdisc_enqueue_root(skb, q);
2068 spin_unlock(root_lock);
2074 * Returns true if either:
2075 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2076 * 2. skb is fragmented and the device does not support SG, or if
2077 * at least one of fragments is in highmem and device does not
2078 * support DMA from it.
2080 static inline int skb_needs_linearize(struct sk_buff *skb,
2081 struct net_device *dev)
2083 return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
2084 (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
2085 illegal_highdma(dev, skb)));
2089 * dev_queue_xmit - transmit a buffer
2090 * @skb: buffer to transmit
2092 * Queue a buffer for transmission to a network device. The caller must
2093 * have set the device and priority and built the buffer before calling
2094 * this function. The function can be called from an interrupt.
2096 * A negative errno code is returned on a failure. A success does not
2097 * guarantee the frame will be transmitted as it may be dropped due
2098 * to congestion or traffic shaping.
2100 * -----------------------------------------------------------------------------------
2101 * I notice this method can also return errors from the queue disciplines,
2102 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2105 * Regardless of the return value, the skb is consumed, so it is currently
2106 * difficult to retry a send to this method. (You can bump the ref count
2107 * before sending to hold a reference for retry if you are careful.)
2109 * When calling this method, interrupts MUST be enabled. This is because
2110 * the BH enable code must have IRQs enabled so that it will not deadlock.
2113 int dev_queue_xmit(struct sk_buff *skb)
2115 struct net_device *dev = skb->dev;
2116 struct netdev_queue *txq;
2120 /* GSO will handle the following emulations directly. */
2121 if (netif_needs_gso(dev, skb))
2124 /* Convert a paged skb to linear, if required */
2125 if (skb_needs_linearize(skb, dev) && __skb_linearize(skb))
2128 /* If packet is not checksummed and device does not support
2129 * checksumming for this protocol, complete checksumming here.
2131 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2132 skb_set_transport_header(skb, skb->csum_start -
2134 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
2139 /* Disable soft irqs for various locks below. Also
2140 * stops preemption for RCU.
2144 txq = dev_pick_tx(dev, skb);
2145 q = rcu_dereference_bh(txq->qdisc);
2147 #ifdef CONFIG_NET_CLS_ACT
2148 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2151 rc = __dev_xmit_skb(skb, q, dev, txq);
2155 /* The device has no queue. Common case for software devices:
2156 loopback, all the sorts of tunnels...
2158 Really, it is unlikely that netif_tx_lock protection is necessary
2159 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2161 However, it is possible, that they rely on protection
2164 Check this and shot the lock. It is not prone from deadlocks.
2165 Either shot noqueue qdisc, it is even simpler 8)
2167 if (dev->flags & IFF_UP) {
2168 int cpu = smp_processor_id(); /* ok because BHs are off */
2170 if (txq->xmit_lock_owner != cpu) {
2172 HARD_TX_LOCK(dev, txq, cpu);
2174 if (!netif_tx_queue_stopped(txq)) {
2175 rc = dev_hard_start_xmit(skb, dev, txq);
2176 if (dev_xmit_complete(rc)) {
2177 HARD_TX_UNLOCK(dev, txq);
2181 HARD_TX_UNLOCK(dev, txq);
2182 if (net_ratelimit())
2183 printk(KERN_CRIT "Virtual device %s asks to "
2184 "queue packet!\n", dev->name);
2186 /* Recursion is detected! It is possible,
2188 if (net_ratelimit())
2189 printk(KERN_CRIT "Dead loop on virtual device "
2190 "%s, fix it urgently!\n", dev->name);
2195 rcu_read_unlock_bh();
2201 rcu_read_unlock_bh();
2204 EXPORT_SYMBOL(dev_queue_xmit);
2207 /*=======================================================================
2209 =======================================================================*/
2211 int netdev_max_backlog __read_mostly = 1000;
2212 int netdev_tstamp_prequeue __read_mostly = 1;
2213 int netdev_budget __read_mostly = 300;
2214 int weight_p __read_mostly = 64; /* old backlog weight */
2216 /* Called with irq disabled */
2217 static inline void ____napi_schedule(struct softnet_data *sd,
2218 struct napi_struct *napi)
2220 list_add_tail(&napi->poll_list, &sd->poll_list);
2221 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2226 /* One global table that all flow-based protocols share. */
2227 struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
2228 EXPORT_SYMBOL(rps_sock_flow_table);
2231 * get_rps_cpu is called from netif_receive_skb and returns the target
2232 * CPU from the RPS map of the receiving queue for a given skb.
2233 * rcu_read_lock must be held on entry.
2235 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2236 struct rps_dev_flow **rflowp)
2238 struct ipv6hdr *ip6;
2240 struct netdev_rx_queue *rxqueue;
2241 struct rps_map *map;
2242 struct rps_dev_flow_table *flow_table;
2243 struct rps_sock_flow_table *sock_flow_table;
2247 u32 addr1, addr2, ihl;
2253 if (skb_rx_queue_recorded(skb)) {
2254 u16 index = skb_get_rx_queue(skb);
2255 if (unlikely(index >= dev->num_rx_queues)) {
2256 WARN_ONCE(dev->num_rx_queues > 1, "%s received packet "
2257 "on queue %u, but number of RX queues is %u\n",
2258 dev->name, index, dev->num_rx_queues);
2261 rxqueue = dev->_rx + index;
2265 if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
2269 goto got_hash; /* Skip hash computation on packet header */
2271 switch (skb->protocol) {
2272 case __constant_htons(ETH_P_IP):
2273 if (!pskb_may_pull(skb, sizeof(*ip)))
2276 ip = (struct iphdr *) skb->data;
2277 ip_proto = ip->protocol;
2278 addr1 = (__force u32) ip->saddr;
2279 addr2 = (__force u32) ip->daddr;
2282 case __constant_htons(ETH_P_IPV6):
2283 if (!pskb_may_pull(skb, sizeof(*ip6)))
2286 ip6 = (struct ipv6hdr *) skb->data;
2287 ip_proto = ip6->nexthdr;
2288 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2289 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2302 case IPPROTO_UDPLITE:
2303 if (pskb_may_pull(skb, (ihl * 4) + 4)) {
2304 ports.v32 = * (__force u32 *) (skb->data + (ihl * 4));
2305 if (ports.v16[1] < ports.v16[0])
2306 swap(ports.v16[0], ports.v16[1]);
2314 /* get a consistent hash (same value on both flow directions) */
2317 skb->rxhash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2322 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2323 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2324 if (flow_table && sock_flow_table) {
2326 struct rps_dev_flow *rflow;
2328 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2331 next_cpu = sock_flow_table->ents[skb->rxhash &
2332 sock_flow_table->mask];
2335 * If the desired CPU (where last recvmsg was done) is
2336 * different from current CPU (one in the rx-queue flow
2337 * table entry), switch if one of the following holds:
2338 * - Current CPU is unset (equal to RPS_NO_CPU).
2339 * - Current CPU is offline.
2340 * - The current CPU's queue tail has advanced beyond the
2341 * last packet that was enqueued using this table entry.
2342 * This guarantees that all previous packets for the flow
2343 * have been dequeued, thus preserving in order delivery.
2345 if (unlikely(tcpu != next_cpu) &&
2346 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2347 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2348 rflow->last_qtail)) >= 0)) {
2349 tcpu = rflow->cpu = next_cpu;
2350 if (tcpu != RPS_NO_CPU)
2351 rflow->last_qtail = per_cpu(softnet_data,
2352 tcpu).input_queue_head;
2354 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2361 map = rcu_dereference(rxqueue->rps_map);
2363 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2365 if (cpu_online(tcpu)) {
2375 /* Called from hardirq (IPI) context */
2376 static void rps_trigger_softirq(void *data)
2378 struct softnet_data *sd = data;
2380 ____napi_schedule(sd, &sd->backlog);
2384 #endif /* CONFIG_RPS */
2387 * Check if this softnet_data structure is another cpu one
2388 * If yes, queue it to our IPI list and return 1
2391 static int rps_ipi_queued(struct softnet_data *sd)
2394 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2397 sd->rps_ipi_next = mysd->rps_ipi_list;
2398 mysd->rps_ipi_list = sd;
2400 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2403 #endif /* CONFIG_RPS */
2408 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2409 * queue (may be a remote CPU queue).
2411 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2412 unsigned int *qtail)
2414 struct softnet_data *sd;
2415 unsigned long flags;
2417 sd = &per_cpu(softnet_data, cpu);
2419 local_irq_save(flags);
2422 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2423 if (skb_queue_len(&sd->input_pkt_queue)) {
2425 __skb_queue_tail(&sd->input_pkt_queue, skb);
2426 input_queue_tail_incr_save(sd, qtail);
2428 local_irq_restore(flags);
2429 return NET_RX_SUCCESS;
2432 /* Schedule NAPI for backlog device
2433 * We can use non atomic operation since we own the queue lock
2435 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2436 if (!rps_ipi_queued(sd))
2437 ____napi_schedule(sd, &sd->backlog);
2445 local_irq_restore(flags);
2452 * netif_rx - post buffer to the network code
2453 * @skb: buffer to post
2455 * This function receives a packet from a device driver and queues it for
2456 * the upper (protocol) levels to process. It always succeeds. The buffer
2457 * may be dropped during processing for congestion control or by the
2461 * NET_RX_SUCCESS (no congestion)
2462 * NET_RX_DROP (packet was dropped)
2466 int netif_rx(struct sk_buff *skb)
2470 /* if netpoll wants it, pretend we never saw it */
2471 if (netpoll_rx(skb))
2474 if (netdev_tstamp_prequeue)
2475 net_timestamp_check(skb);
2479 struct rps_dev_flow voidflow, *rflow = &voidflow;
2484 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2486 cpu = smp_processor_id();
2488 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2495 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2501 EXPORT_SYMBOL(netif_rx);
2503 int netif_rx_ni(struct sk_buff *skb)
2508 err = netif_rx(skb);
2509 if (local_softirq_pending())
2515 EXPORT_SYMBOL(netif_rx_ni);
2517 static void net_tx_action(struct softirq_action *h)
2519 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2521 if (sd->completion_queue) {
2522 struct sk_buff *clist;
2524 local_irq_disable();
2525 clist = sd->completion_queue;
2526 sd->completion_queue = NULL;
2530 struct sk_buff *skb = clist;
2531 clist = clist->next;
2533 WARN_ON(atomic_read(&skb->users));
2538 if (sd->output_queue) {
2541 local_irq_disable();
2542 head = sd->output_queue;
2543 sd->output_queue = NULL;
2544 sd->output_queue_tailp = &sd->output_queue;
2548 struct Qdisc *q = head;
2549 spinlock_t *root_lock;
2551 head = head->next_sched;
2553 root_lock = qdisc_lock(q);
2554 if (spin_trylock(root_lock)) {
2555 smp_mb__before_clear_bit();
2556 clear_bit(__QDISC_STATE_SCHED,
2559 spin_unlock(root_lock);
2561 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2563 __netif_reschedule(q);
2565 smp_mb__before_clear_bit();
2566 clear_bit(__QDISC_STATE_SCHED,
2574 static inline int deliver_skb(struct sk_buff *skb,
2575 struct packet_type *pt_prev,
2576 struct net_device *orig_dev)
2578 atomic_inc(&skb->users);
2579 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2582 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2584 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
2585 /* This hook is defined here for ATM LANE */
2586 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2587 unsigned char *addr) __read_mostly;
2588 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2592 * If bridge module is loaded call bridging hook.
2593 * returns NULL if packet was consumed.
2595 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2596 struct sk_buff *skb) __read_mostly;
2597 EXPORT_SYMBOL_GPL(br_handle_frame_hook);
2599 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2600 struct packet_type **pt_prev, int *ret,
2601 struct net_device *orig_dev)
2603 struct net_bridge_port *port;
2605 if (skb->pkt_type == PACKET_LOOPBACK ||
2606 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2610 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2614 return br_handle_frame_hook(port, skb);
2617 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2620 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2621 struct sk_buff *(*macvlan_handle_frame_hook)(struct macvlan_port *p,
2622 struct sk_buff *skb) __read_mostly;
2623 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2625 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2626 struct packet_type **pt_prev,
2628 struct net_device *orig_dev)
2630 struct macvlan_port *port;
2632 port = rcu_dereference(skb->dev->macvlan_port);
2637 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2640 return macvlan_handle_frame_hook(port, skb);
2643 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2646 #ifdef CONFIG_NET_CLS_ACT
2647 /* TODO: Maybe we should just force sch_ingress to be compiled in
2648 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2649 * a compare and 2 stores extra right now if we dont have it on
2650 * but have CONFIG_NET_CLS_ACT
2651 * NOTE: This doesnt stop any functionality; if you dont have
2652 * the ingress scheduler, you just cant add policies on ingress.
2655 static int ing_filter(struct sk_buff *skb)
2657 struct net_device *dev = skb->dev;
2658 u32 ttl = G_TC_RTTL(skb->tc_verd);
2659 struct netdev_queue *rxq;
2660 int result = TC_ACT_OK;
2663 if (MAX_RED_LOOP < ttl++) {
2665 "Redir loop detected Dropping packet (%d->%d)\n",
2666 skb->skb_iif, dev->ifindex);
2670 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2671 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2673 rxq = &dev->rx_queue;
2676 if (q != &noop_qdisc) {
2677 spin_lock(qdisc_lock(q));
2678 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2679 result = qdisc_enqueue_root(skb, q);
2680 spin_unlock(qdisc_lock(q));
2686 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2687 struct packet_type **pt_prev,
2688 int *ret, struct net_device *orig_dev)
2690 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2694 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2697 /* Huh? Why does turning on AF_PACKET affect this? */
2698 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2701 switch (ing_filter(skb)) {
2715 * netif_nit_deliver - deliver received packets to network taps
2718 * This function is used to deliver incoming packets to network
2719 * taps. It should be used when the normal netif_receive_skb path
2720 * is bypassed, for example because of VLAN acceleration.
2722 void netif_nit_deliver(struct sk_buff *skb)
2724 struct packet_type *ptype;
2726 if (list_empty(&ptype_all))
2729 skb_reset_network_header(skb);
2730 skb_reset_transport_header(skb);
2731 skb->mac_len = skb->network_header - skb->mac_header;
2734 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2735 if (!ptype->dev || ptype->dev == skb->dev)
2736 deliver_skb(skb, ptype, skb->dev);
2741 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2742 struct net_device *master)
2744 if (skb->pkt_type == PACKET_HOST) {
2745 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2747 memcpy(dest, master->dev_addr, ETH_ALEN);
2751 /* On bonding slaves other than the currently active slave, suppress
2752 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2753 * ARP on active-backup slaves with arp_validate enabled.
2755 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2757 struct net_device *dev = skb->dev;
2759 if (master->priv_flags & IFF_MASTER_ARPMON)
2760 dev->last_rx = jiffies;
2762 if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
2763 /* Do address unmangle. The local destination address
2764 * will be always the one master has. Provides the right
2765 * functionality in a bridge.
2767 skb_bond_set_mac_by_master(skb, master);
2770 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2771 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2772 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2775 if (master->priv_flags & IFF_MASTER_ALB) {
2776 if (skb->pkt_type != PACKET_BROADCAST &&
2777 skb->pkt_type != PACKET_MULTICAST)
2780 if (master->priv_flags & IFF_MASTER_8023AD &&
2781 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2788 EXPORT_SYMBOL(__skb_bond_should_drop);
2790 static int __netif_receive_skb(struct sk_buff *skb)
2792 struct packet_type *ptype, *pt_prev;
2793 struct net_device *orig_dev;
2794 struct net_device *master;
2795 struct net_device *null_or_orig;
2796 struct net_device *orig_or_bond;
2797 int ret = NET_RX_DROP;
2800 if (!netdev_tstamp_prequeue)
2801 net_timestamp_check(skb);
2803 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2804 return NET_RX_SUCCESS;
2806 /* if we've gotten here through NAPI, check netpoll */
2807 if (netpoll_receive_skb(skb))
2811 skb->skb_iif = skb->dev->ifindex;
2813 null_or_orig = NULL;
2814 orig_dev = skb->dev;
2815 master = ACCESS_ONCE(orig_dev->master);
2817 if (skb_bond_should_drop(skb, master))
2818 null_or_orig = orig_dev; /* deliver only exact match */
2823 __get_cpu_var(softnet_data).processed++;
2825 skb_reset_network_header(skb);
2826 skb_reset_transport_header(skb);
2827 skb->mac_len = skb->network_header - skb->mac_header;
2833 #ifdef CONFIG_NET_CLS_ACT
2834 if (skb->tc_verd & TC_NCLS) {
2835 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2840 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2841 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2842 ptype->dev == orig_dev) {
2844 ret = deliver_skb(skb, pt_prev, orig_dev);
2849 #ifdef CONFIG_NET_CLS_ACT
2850 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2856 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2859 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2864 * Make sure frames received on VLAN interfaces stacked on
2865 * bonding interfaces still make their way to any base bonding
2866 * device that may have registered for a specific ptype. The
2867 * handler may have to adjust skb->dev and orig_dev.
2869 orig_or_bond = orig_dev;
2870 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
2871 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2872 orig_or_bond = vlan_dev_real_dev(skb->dev);
2875 type = skb->protocol;
2876 list_for_each_entry_rcu(ptype,
2877 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2878 if (ptype->type == type && (ptype->dev == null_or_orig ||
2879 ptype->dev == skb->dev || ptype->dev == orig_dev ||
2880 ptype->dev == orig_or_bond)) {
2882 ret = deliver_skb(skb, pt_prev, orig_dev);
2888 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2891 /* Jamal, now you will not able to escape explaining
2892 * me how you were going to use this. :-)
2903 * netif_receive_skb - process receive buffer from network
2904 * @skb: buffer to process
2906 * netif_receive_skb() is the main receive data processing function.
2907 * It always succeeds. The buffer may be dropped during processing
2908 * for congestion control or by the protocol layers.
2910 * This function may only be called from softirq context and interrupts
2911 * should be enabled.
2913 * Return values (usually ignored):
2914 * NET_RX_SUCCESS: no congestion
2915 * NET_RX_DROP: packet was dropped
2917 int netif_receive_skb(struct sk_buff *skb)
2919 if (netdev_tstamp_prequeue)
2920 net_timestamp_check(skb);
2924 struct rps_dev_flow voidflow, *rflow = &voidflow;
2929 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2932 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2936 ret = __netif_receive_skb(skb);
2942 return __netif_receive_skb(skb);
2945 EXPORT_SYMBOL(netif_receive_skb);
2947 /* Network device is going away, flush any packets still pending
2948 * Called with irqs disabled.
2950 static void flush_backlog(void *arg)
2952 struct net_device *dev = arg;
2953 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2954 struct sk_buff *skb, *tmp;
2957 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
2958 if (skb->dev == dev) {
2959 __skb_unlink(skb, &sd->input_pkt_queue);
2961 input_queue_head_incr(sd);
2966 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
2967 if (skb->dev == dev) {
2968 __skb_unlink(skb, &sd->process_queue);
2970 input_queue_head_incr(sd);
2975 static int napi_gro_complete(struct sk_buff *skb)
2977 struct packet_type *ptype;
2978 __be16 type = skb->protocol;
2979 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2982 if (NAPI_GRO_CB(skb)->count == 1) {
2983 skb_shinfo(skb)->gso_size = 0;
2988 list_for_each_entry_rcu(ptype, head, list) {
2989 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2992 err = ptype->gro_complete(skb);
2998 WARN_ON(&ptype->list == head);
3000 return NET_RX_SUCCESS;
3004 return netif_receive_skb(skb);
3007 static void napi_gro_flush(struct napi_struct *napi)
3009 struct sk_buff *skb, *next;
3011 for (skb = napi->gro_list; skb; skb = next) {
3014 napi_gro_complete(skb);
3017 napi->gro_count = 0;
3018 napi->gro_list = NULL;
3021 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3023 struct sk_buff **pp = NULL;
3024 struct packet_type *ptype;
3025 __be16 type = skb->protocol;
3026 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3029 enum gro_result ret;
3031 if (!(skb->dev->features & NETIF_F_GRO))
3034 if (skb_is_gso(skb) || skb_has_frags(skb))
3038 list_for_each_entry_rcu(ptype, head, list) {
3039 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3042 skb_set_network_header(skb, skb_gro_offset(skb));
3043 mac_len = skb->network_header - skb->mac_header;
3044 skb->mac_len = mac_len;
3045 NAPI_GRO_CB(skb)->same_flow = 0;
3046 NAPI_GRO_CB(skb)->flush = 0;
3047 NAPI_GRO_CB(skb)->free = 0;
3049 pp = ptype->gro_receive(&napi->gro_list, skb);
3054 if (&ptype->list == head)
3057 same_flow = NAPI_GRO_CB(skb)->same_flow;
3058 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3061 struct sk_buff *nskb = *pp;
3065 napi_gro_complete(nskb);
3072 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3076 NAPI_GRO_CB(skb)->count = 1;
3077 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3078 skb->next = napi->gro_list;
3079 napi->gro_list = skb;
3083 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3084 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3086 BUG_ON(skb->end - skb->tail < grow);
3088 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3091 skb->data_len -= grow;
3093 skb_shinfo(skb)->frags[0].page_offset += grow;
3094 skb_shinfo(skb)->frags[0].size -= grow;
3096 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3097 put_page(skb_shinfo(skb)->frags[0].page);
3098 memmove(skb_shinfo(skb)->frags,
3099 skb_shinfo(skb)->frags + 1,
3100 --skb_shinfo(skb)->nr_frags);
3111 EXPORT_SYMBOL(dev_gro_receive);
3114 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3118 if (netpoll_rx_on(skb))
3121 for (p = napi->gro_list; p; p = p->next) {
3122 NAPI_GRO_CB(p)->same_flow =
3123 (p->dev == skb->dev) &&
3124 !compare_ether_header(skb_mac_header(p),
3125 skb_gro_mac_header(skb));
3126 NAPI_GRO_CB(p)->flush = 0;
3129 return dev_gro_receive(napi, skb);
3132 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3136 if (netif_receive_skb(skb))
3141 case GRO_MERGED_FREE:
3152 EXPORT_SYMBOL(napi_skb_finish);
3154 void skb_gro_reset_offset(struct sk_buff *skb)
3156 NAPI_GRO_CB(skb)->data_offset = 0;
3157 NAPI_GRO_CB(skb)->frag0 = NULL;
3158 NAPI_GRO_CB(skb)->frag0_len = 0;
3160 if (skb->mac_header == skb->tail &&
3161 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3162 NAPI_GRO_CB(skb)->frag0 =
3163 page_address(skb_shinfo(skb)->frags[0].page) +
3164 skb_shinfo(skb)->frags[0].page_offset;
3165 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3168 EXPORT_SYMBOL(skb_gro_reset_offset);
3170 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3172 skb_gro_reset_offset(skb);
3174 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3176 EXPORT_SYMBOL(napi_gro_receive);
3178 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3180 __skb_pull(skb, skb_headlen(skb));
3181 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3185 EXPORT_SYMBOL(napi_reuse_skb);
3187 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3189 struct sk_buff *skb = napi->skb;
3192 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3198 EXPORT_SYMBOL(napi_get_frags);
3200 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3206 skb->protocol = eth_type_trans(skb, skb->dev);
3208 if (ret == GRO_HELD)
3209 skb_gro_pull(skb, -ETH_HLEN);
3210 else if (netif_receive_skb(skb))
3215 case GRO_MERGED_FREE:
3216 napi_reuse_skb(napi, skb);
3225 EXPORT_SYMBOL(napi_frags_finish);
3227 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3229 struct sk_buff *skb = napi->skb;
3236 skb_reset_mac_header(skb);
3237 skb_gro_reset_offset(skb);
3239 off = skb_gro_offset(skb);
3240 hlen = off + sizeof(*eth);
3241 eth = skb_gro_header_fast(skb, off);
3242 if (skb_gro_header_hard(skb, hlen)) {
3243 eth = skb_gro_header_slow(skb, hlen, off);
3244 if (unlikely(!eth)) {
3245 napi_reuse_skb(napi, skb);
3251 skb_gro_pull(skb, sizeof(*eth));
3254 * This works because the only protocols we care about don't require
3255 * special handling. We'll fix it up properly at the end.
3257 skb->protocol = eth->h_proto;
3262 EXPORT_SYMBOL(napi_frags_skb);
3264 gro_result_t napi_gro_frags(struct napi_struct *napi)
3266 struct sk_buff *skb = napi_frags_skb(napi);
3271 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3273 EXPORT_SYMBOL(napi_gro_frags);
3276 * net_rps_action sends any pending IPI's for rps.
3277 * Note: called with local irq disabled, but exits with local irq enabled.
3279 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3282 struct softnet_data *remsd = sd->rps_ipi_list;
3285 sd->rps_ipi_list = NULL;
3289 /* Send pending IPI's to kick RPS processing on remote cpus. */
3291 struct softnet_data *next = remsd->rps_ipi_next;
3293 if (cpu_online(remsd->cpu))
3294 __smp_call_function_single(remsd->cpu,
3303 static int process_backlog(struct napi_struct *napi, int quota)
3306 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3309 /* Check if we have pending ipi, its better to send them now,
3310 * not waiting net_rx_action() end.
3312 if (sd->rps_ipi_list) {
3313 local_irq_disable();
3314 net_rps_action_and_irq_enable(sd);
3317 napi->weight = weight_p;
3318 local_irq_disable();
3319 while (work < quota) {
3320 struct sk_buff *skb;
3323 while ((skb = __skb_dequeue(&sd->process_queue))) {
3325 __netif_receive_skb(skb);
3326 local_irq_disable();
3327 input_queue_head_incr(sd);
3328 if (++work >= quota) {
3335 qlen = skb_queue_len(&sd->input_pkt_queue);
3337 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3338 &sd->process_queue);
3340 if (qlen < quota - work) {
3342 * Inline a custom version of __napi_complete().
3343 * only current cpu owns and manipulates this napi,
3344 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3345 * we can use a plain write instead of clear_bit(),
3346 * and we dont need an smp_mb() memory barrier.
3348 list_del(&napi->poll_list);
3351 quota = work + qlen;
3361 * __napi_schedule - schedule for receive
3362 * @n: entry to schedule
3364 * The entry's receive function will be scheduled to run
3366 void __napi_schedule(struct napi_struct *n)
3368 unsigned long flags;
3370 local_irq_save(flags);
3371 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3372 local_irq_restore(flags);
3374 EXPORT_SYMBOL(__napi_schedule);
3376 void __napi_complete(struct napi_struct *n)
3378 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3379 BUG_ON(n->gro_list);
3381 list_del(&n->poll_list);
3382 smp_mb__before_clear_bit();
3383 clear_bit(NAPI_STATE_SCHED, &n->state);
3385 EXPORT_SYMBOL(__napi_complete);
3387 void napi_complete(struct napi_struct *n)
3389 unsigned long flags;
3392 * don't let napi dequeue from the cpu poll list
3393 * just in case its running on a different cpu
3395 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3399 local_irq_save(flags);
3401 local_irq_restore(flags);
3403 EXPORT_SYMBOL(napi_complete);
3405 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3406 int (*poll)(struct napi_struct *, int), int weight)
3408 INIT_LIST_HEAD(&napi->poll_list);
3409 napi->gro_count = 0;
3410 napi->gro_list = NULL;
3413 napi->weight = weight;
3414 list_add(&napi->dev_list, &dev->napi_list);
3416 #ifdef CONFIG_NETPOLL
3417 spin_lock_init(&napi->poll_lock);
3418 napi->poll_owner = -1;
3420 set_bit(NAPI_STATE_SCHED, &napi->state);
3422 EXPORT_SYMBOL(netif_napi_add);
3424 void netif_napi_del(struct napi_struct *napi)
3426 struct sk_buff *skb, *next;
3428 list_del_init(&napi->dev_list);
3429 napi_free_frags(napi);
3431 for (skb = napi->gro_list; skb; skb = next) {
3437 napi->gro_list = NULL;
3438 napi->gro_count = 0;
3440 EXPORT_SYMBOL(netif_napi_del);
3442 static void net_rx_action(struct softirq_action *h)
3444 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3445 unsigned long time_limit = jiffies + 2;
3446 int budget = netdev_budget;
3449 local_irq_disable();
3451 while (!list_empty(&sd->poll_list)) {
3452 struct napi_struct *n;
3455 /* If softirq window is exhuasted then punt.
3456 * Allow this to run for 2 jiffies since which will allow
3457 * an average latency of 1.5/HZ.
3459 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3464 /* Even though interrupts have been re-enabled, this
3465 * access is safe because interrupts can only add new
3466 * entries to the tail of this list, and only ->poll()
3467 * calls can remove this head entry from the list.
3469 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3471 have = netpoll_poll_lock(n);
3475 /* This NAPI_STATE_SCHED test is for avoiding a race
3476 * with netpoll's poll_napi(). Only the entity which
3477 * obtains the lock and sees NAPI_STATE_SCHED set will
3478 * actually make the ->poll() call. Therefore we avoid
3479 * accidently calling ->poll() when NAPI is not scheduled.
3482 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3483 work = n->poll(n, weight);
3487 WARN_ON_ONCE(work > weight);
3491 local_irq_disable();
3493 /* Drivers must not modify the NAPI state if they
3494 * consume the entire weight. In such cases this code
3495 * still "owns" the NAPI instance and therefore can
3496 * move the instance around on the list at-will.
3498 if (unlikely(work == weight)) {
3499 if (unlikely(napi_disable_pending(n))) {
3502 local_irq_disable();
3504 list_move_tail(&n->poll_list, &sd->poll_list);
3507 netpoll_poll_unlock(have);
3510 net_rps_action_and_irq_enable(sd);
3512 #ifdef CONFIG_NET_DMA
3514 * There may not be any more sk_buffs coming right now, so push
3515 * any pending DMA copies to hardware
3517 dma_issue_pending_all();
3524 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3528 static gifconf_func_t *gifconf_list[NPROTO];
3531 * register_gifconf - register a SIOCGIF handler
3532 * @family: Address family
3533 * @gifconf: Function handler
3535 * Register protocol dependent address dumping routines. The handler
3536 * that is passed must not be freed or reused until it has been replaced
3537 * by another handler.
3539 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3541 if (family >= NPROTO)
3543 gifconf_list[family] = gifconf;
3546 EXPORT_SYMBOL(register_gifconf);
3550 * Map an interface index to its name (SIOCGIFNAME)
3554 * We need this ioctl for efficient implementation of the
3555 * if_indextoname() function required by the IPv6 API. Without
3556 * it, we would have to search all the interfaces to find a
3560 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3562 struct net_device *dev;
3566 * Fetch the caller's info block.
3569 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3573 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3579 strcpy(ifr.ifr_name, dev->name);
3582 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3588 * Perform a SIOCGIFCONF call. This structure will change
3589 * size eventually, and there is nothing I can do about it.
3590 * Thus we will need a 'compatibility mode'.
3593 static int dev_ifconf(struct net *net, char __user *arg)
3596 struct net_device *dev;
3603 * Fetch the caller's info block.
3606 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3613 * Loop over the interfaces, and write an info block for each.
3617 for_each_netdev(net, dev) {
3618 for (i = 0; i < NPROTO; i++) {
3619 if (gifconf_list[i]) {
3622 done = gifconf_list[i](dev, NULL, 0);
3624 done = gifconf_list[i](dev, pos + total,
3634 * All done. Write the updated control block back to the caller.
3636 ifc.ifc_len = total;
3639 * Both BSD and Solaris return 0 here, so we do too.
3641 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3644 #ifdef CONFIG_PROC_FS
3646 * This is invoked by the /proc filesystem handler to display a device
3649 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3652 struct net *net = seq_file_net(seq);
3654 struct net_device *dev;
3658 return SEQ_START_TOKEN;
3661 for_each_netdev_rcu(net, dev)
3668 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3670 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3671 first_net_device(seq_file_net(seq)) :
3672 next_net_device((struct net_device *)v);
3675 return rcu_dereference(dev);
3678 void dev_seq_stop(struct seq_file *seq, void *v)
3684 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3686 const struct net_device_stats *stats = dev_get_stats(dev);
3688 seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3689 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3690 dev->name, stats->rx_bytes, stats->rx_packets,
3692 stats->rx_dropped + stats->rx_missed_errors,
3693 stats->rx_fifo_errors,
3694 stats->rx_length_errors + stats->rx_over_errors +
3695 stats->rx_crc_errors + stats->rx_frame_errors,
3696 stats->rx_compressed, stats->multicast,
3697 stats->tx_bytes, stats->tx_packets,
3698 stats->tx_errors, stats->tx_dropped,
3699 stats->tx_fifo_errors, stats->collisions,
3700 stats->tx_carrier_errors +
3701 stats->tx_aborted_errors +
3702 stats->tx_window_errors +
3703 stats->tx_heartbeat_errors,
3704 stats->tx_compressed);
3708 * Called from the PROCfs module. This now uses the new arbitrary sized
3709 * /proc/net interface to create /proc/net/dev
3711 static int dev_seq_show(struct seq_file *seq, void *v)
3713 if (v == SEQ_START_TOKEN)
3714 seq_puts(seq, "Inter-| Receive "
3716 " face |bytes packets errs drop fifo frame "
3717 "compressed multicast|bytes packets errs "
3718 "drop fifo colls carrier compressed\n");
3720 dev_seq_printf_stats(seq, v);
3724 static struct softnet_data *softnet_get_online(loff_t *pos)
3726 struct softnet_data *sd = NULL;
3728 while (*pos < nr_cpu_ids)
3729 if (cpu_online(*pos)) {
3730 sd = &per_cpu(softnet_data, *pos);
3737 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3739 return softnet_get_online(pos);
3742 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3745 return softnet_get_online(pos);
3748 static void softnet_seq_stop(struct seq_file *seq, void *v)
3752 static int softnet_seq_show(struct seq_file *seq, void *v)
3754 struct softnet_data *sd = v;
3756 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3757 sd->processed, sd->dropped, sd->time_squeeze, 0,
3758 0, 0, 0, 0, /* was fastroute */
3759 sd->cpu_collision, sd->received_rps);
3763 static const struct seq_operations dev_seq_ops = {
3764 .start = dev_seq_start,
3765 .next = dev_seq_next,
3766 .stop = dev_seq_stop,
3767 .show = dev_seq_show,
3770 static int dev_seq_open(struct inode *inode, struct file *file)
3772 return seq_open_net(inode, file, &dev_seq_ops,
3773 sizeof(struct seq_net_private));
3776 static const struct file_operations dev_seq_fops = {
3777 .owner = THIS_MODULE,
3778 .open = dev_seq_open,
3780 .llseek = seq_lseek,
3781 .release = seq_release_net,
3784 static const struct seq_operations softnet_seq_ops = {
3785 .start = softnet_seq_start,
3786 .next = softnet_seq_next,
3787 .stop = softnet_seq_stop,
3788 .show = softnet_seq_show,
3791 static int softnet_seq_open(struct inode *inode, struct file *file)
3793 return seq_open(file, &softnet_seq_ops);
3796 static const struct file_operations softnet_seq_fops = {
3797 .owner = THIS_MODULE,
3798 .open = softnet_seq_open,
3800 .llseek = seq_lseek,
3801 .release = seq_release,
3804 static void *ptype_get_idx(loff_t pos)
3806 struct packet_type *pt = NULL;
3810 list_for_each_entry_rcu(pt, &ptype_all, list) {
3816 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3817 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3826 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3830 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3833 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3835 struct packet_type *pt;
3836 struct list_head *nxt;
3840 if (v == SEQ_START_TOKEN)
3841 return ptype_get_idx(0);
3844 nxt = pt->list.next;
3845 if (pt->type == htons(ETH_P_ALL)) {
3846 if (nxt != &ptype_all)
3849 nxt = ptype_base[0].next;
3851 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3853 while (nxt == &ptype_base[hash]) {
3854 if (++hash >= PTYPE_HASH_SIZE)
3856 nxt = ptype_base[hash].next;
3859 return list_entry(nxt, struct packet_type, list);
3862 static void ptype_seq_stop(struct seq_file *seq, void *v)
3868 static int ptype_seq_show(struct seq_file *seq, void *v)
3870 struct packet_type *pt = v;
3872 if (v == SEQ_START_TOKEN)
3873 seq_puts(seq, "Type Device Function\n");
3874 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3875 if (pt->type == htons(ETH_P_ALL))
3876 seq_puts(seq, "ALL ");
3878 seq_printf(seq, "%04x", ntohs(pt->type));
3880 seq_printf(seq, " %-8s %pF\n",
3881 pt->dev ? pt->dev->name : "", pt->func);
3887 static const struct seq_operations ptype_seq_ops = {
3888 .start = ptype_seq_start,
3889 .next = ptype_seq_next,
3890 .stop = ptype_seq_stop,
3891 .show = ptype_seq_show,
3894 static int ptype_seq_open(struct inode *inode, struct file *file)
3896 return seq_open_net(inode, file, &ptype_seq_ops,
3897 sizeof(struct seq_net_private));
3900 static const struct file_operations ptype_seq_fops = {
3901 .owner = THIS_MODULE,
3902 .open = ptype_seq_open,
3904 .llseek = seq_lseek,
3905 .release = seq_release_net,
3909 static int __net_init dev_proc_net_init(struct net *net)
3913 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3915 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3917 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3920 if (wext_proc_init(net))
3926 proc_net_remove(net, "ptype");
3928 proc_net_remove(net, "softnet_stat");
3930 proc_net_remove(net, "dev");
3934 static void __net_exit dev_proc_net_exit(struct net *net)
3936 wext_proc_exit(net);
3938 proc_net_remove(net, "ptype");
3939 proc_net_remove(net, "softnet_stat");
3940 proc_net_remove(net, "dev");
3943 static struct pernet_operations __net_initdata dev_proc_ops = {
3944 .init = dev_proc_net_init,
3945 .exit = dev_proc_net_exit,
3948 static int __init dev_proc_init(void)
3950 return register_pernet_subsys(&dev_proc_ops);
3953 #define dev_proc_init() 0
3954 #endif /* CONFIG_PROC_FS */
3958 * netdev_set_master - set up master/slave pair
3959 * @slave: slave device
3960 * @master: new master device
3962 * Changes the master device of the slave. Pass %NULL to break the
3963 * bonding. The caller must hold the RTNL semaphore. On a failure
3964 * a negative errno code is returned. On success the reference counts
3965 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3966 * function returns zero.
3968 int netdev_set_master(struct net_device *slave, struct net_device *master)
3970 struct net_device *old = slave->master;
3980 slave->master = master;
3987 slave->flags |= IFF_SLAVE;
3989 slave->flags &= ~IFF_SLAVE;
3991 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3994 EXPORT_SYMBOL(netdev_set_master);
3996 static void dev_change_rx_flags(struct net_device *dev, int flags)
3998 const struct net_device_ops *ops = dev->netdev_ops;
4000 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4001 ops->ndo_change_rx_flags(dev, flags);
4004 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4006 unsigned short old_flags = dev->flags;
4012 dev->flags |= IFF_PROMISC;
4013 dev->promiscuity += inc;
4014 if (dev->promiscuity == 0) {
4017 * If inc causes overflow, untouch promisc and return error.
4020 dev->flags &= ~IFF_PROMISC;
4022 dev->promiscuity -= inc;
4023 printk(KERN_WARNING "%s: promiscuity touches roof, "
4024 "set promiscuity failed, promiscuity feature "
4025 "of device might be broken.\n", dev->name);
4029 if (dev->flags != old_flags) {
4030 printk(KERN_INFO "device %s %s promiscuous mode\n",
4031 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4033 if (audit_enabled) {
4034 current_uid_gid(&uid, &gid);
4035 audit_log(current->audit_context, GFP_ATOMIC,
4036 AUDIT_ANOM_PROMISCUOUS,
4037 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4038 dev->name, (dev->flags & IFF_PROMISC),
4039 (old_flags & IFF_PROMISC),
4040 audit_get_loginuid(current),
4042 audit_get_sessionid(current));
4045 dev_change_rx_flags(dev, IFF_PROMISC);
4051 * dev_set_promiscuity - update promiscuity count on a device
4055 * Add or remove promiscuity from a device. While the count in the device
4056 * remains above zero the interface remains promiscuous. Once it hits zero
4057 * the device reverts back to normal filtering operation. A negative inc
4058 * value is used to drop promiscuity on the device.
4059 * Return 0 if successful or a negative errno code on error.
4061 int dev_set_promiscuity(struct net_device *dev, int inc)
4063 unsigned short old_flags = dev->flags;
4066 err = __dev_set_promiscuity(dev, inc);
4069 if (dev->flags != old_flags)
4070 dev_set_rx_mode(dev);
4073 EXPORT_SYMBOL(dev_set_promiscuity);
4076 * dev_set_allmulti - update allmulti count on a device
4080 * Add or remove reception of all multicast frames to a device. While the
4081 * count in the device remains above zero the interface remains listening
4082 * to all interfaces. Once it hits zero the device reverts back to normal
4083 * filtering operation. A negative @inc value is used to drop the counter
4084 * when releasing a resource needing all multicasts.
4085 * Return 0 if successful or a negative errno code on error.
4088 int dev_set_allmulti(struct net_device *dev, int inc)
4090 unsigned short old_flags = dev->flags;
4094 dev->flags |= IFF_ALLMULTI;
4095 dev->allmulti += inc;
4096 if (dev->allmulti == 0) {
4099 * If inc causes overflow, untouch allmulti and return error.
4102 dev->flags &= ~IFF_ALLMULTI;
4104 dev->allmulti -= inc;
4105 printk(KERN_WARNING "%s: allmulti touches roof, "
4106 "set allmulti failed, allmulti feature of "
4107 "device might be broken.\n", dev->name);
4111 if (dev->flags ^ old_flags) {
4112 dev_change_rx_flags(dev, IFF_ALLMULTI);
4113 dev_set_rx_mode(dev);
4117 EXPORT_SYMBOL(dev_set_allmulti);
4120 * Upload unicast and multicast address lists to device and
4121 * configure RX filtering. When the device doesn't support unicast
4122 * filtering it is put in promiscuous mode while unicast addresses
4125 void __dev_set_rx_mode(struct net_device *dev)
4127 const struct net_device_ops *ops = dev->netdev_ops;
4129 /* dev_open will call this function so the list will stay sane. */
4130 if (!(dev->flags&IFF_UP))
4133 if (!netif_device_present(dev))
4136 if (ops->ndo_set_rx_mode)
4137 ops->ndo_set_rx_mode(dev);
4139 /* Unicast addresses changes may only happen under the rtnl,
4140 * therefore calling __dev_set_promiscuity here is safe.
4142 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4143 __dev_set_promiscuity(dev, 1);
4144 dev->uc_promisc = 1;
4145 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4146 __dev_set_promiscuity(dev, -1);
4147 dev->uc_promisc = 0;
4150 if (ops->ndo_set_multicast_list)
4151 ops->ndo_set_multicast_list(dev);
4155 void dev_set_rx_mode(struct net_device *dev)
4157 netif_addr_lock_bh(dev);
4158 __dev_set_rx_mode(dev);
4159 netif_addr_unlock_bh(dev);
4163 * dev_get_flags - get flags reported to userspace
4166 * Get the combination of flag bits exported through APIs to userspace.
4168 unsigned dev_get_flags(const struct net_device *dev)
4172 flags = (dev->flags & ~(IFF_PROMISC |
4177 (dev->gflags & (IFF_PROMISC |
4180 if (netif_running(dev)) {
4181 if (netif_oper_up(dev))
4182 flags |= IFF_RUNNING;
4183 if (netif_carrier_ok(dev))
4184 flags |= IFF_LOWER_UP;
4185 if (netif_dormant(dev))
4186 flags |= IFF_DORMANT;
4191 EXPORT_SYMBOL(dev_get_flags);
4193 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4195 int old_flags = dev->flags;
4201 * Set the flags on our device.
4204 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4205 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4207 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4211 * Load in the correct multicast list now the flags have changed.
4214 if ((old_flags ^ flags) & IFF_MULTICAST)
4215 dev_change_rx_flags(dev, IFF_MULTICAST);
4217 dev_set_rx_mode(dev);
4220 * Have we downed the interface. We handle IFF_UP ourselves
4221 * according to user attempts to set it, rather than blindly
4226 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4227 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4230 dev_set_rx_mode(dev);
4233 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4234 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4236 dev->gflags ^= IFF_PROMISC;
4237 dev_set_promiscuity(dev, inc);
4240 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4241 is important. Some (broken) drivers set IFF_PROMISC, when
4242 IFF_ALLMULTI is requested not asking us and not reporting.
4244 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4245 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4247 dev->gflags ^= IFF_ALLMULTI;
4248 dev_set_allmulti(dev, inc);
4254 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4256 unsigned int changes = dev->flags ^ old_flags;
4258 if (changes & IFF_UP) {
4259 if (dev->flags & IFF_UP)
4260 call_netdevice_notifiers(NETDEV_UP, dev);
4262 call_netdevice_notifiers(NETDEV_DOWN, dev);
4265 if (dev->flags & IFF_UP &&
4266 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4267 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4271 * dev_change_flags - change device settings
4273 * @flags: device state flags
4275 * Change settings on device based state flags. The flags are
4276 * in the userspace exported format.
4278 int dev_change_flags(struct net_device *dev, unsigned flags)
4281 int old_flags = dev->flags;
4283 ret = __dev_change_flags(dev, flags);
4287 changes = old_flags ^ dev->flags;
4289 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4291 __dev_notify_flags(dev, old_flags);
4294 EXPORT_SYMBOL(dev_change_flags);
4297 * dev_set_mtu - Change maximum transfer unit
4299 * @new_mtu: new transfer unit
4301 * Change the maximum transfer size of the network device.
4303 int dev_set_mtu(struct net_device *dev, int new_mtu)
4305 const struct net_device_ops *ops = dev->netdev_ops;
4308 if (new_mtu == dev->mtu)
4311 /* MTU must be positive. */
4315 if (!netif_device_present(dev))
4319 if (ops->ndo_change_mtu)
4320 err = ops->ndo_change_mtu(dev, new_mtu);
4324 if (!err && dev->flags & IFF_UP)
4325 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4328 EXPORT_SYMBOL(dev_set_mtu);
4331 * dev_set_mac_address - Change Media Access Control Address
4335 * Change the hardware (MAC) address of the device
4337 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4339 const struct net_device_ops *ops = dev->netdev_ops;
4342 if (!ops->ndo_set_mac_address)
4344 if (sa->sa_family != dev->type)
4346 if (!netif_device_present(dev))
4348 err = ops->ndo_set_mac_address(dev, sa);
4350 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4353 EXPORT_SYMBOL(dev_set_mac_address);
4356 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4358 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4361 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4367 case SIOCGIFFLAGS: /* Get interface flags */
4368 ifr->ifr_flags = (short) dev_get_flags(dev);
4371 case SIOCGIFMETRIC: /* Get the metric on the interface
4372 (currently unused) */
4373 ifr->ifr_metric = 0;
4376 case SIOCGIFMTU: /* Get the MTU of a device */
4377 ifr->ifr_mtu = dev->mtu;
4382 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4384 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4385 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4386 ifr->ifr_hwaddr.sa_family = dev->type;
4394 ifr->ifr_map.mem_start = dev->mem_start;
4395 ifr->ifr_map.mem_end = dev->mem_end;
4396 ifr->ifr_map.base_addr = dev->base_addr;
4397 ifr->ifr_map.irq = dev->irq;
4398 ifr->ifr_map.dma = dev->dma;
4399 ifr->ifr_map.port = dev->if_port;
4403 ifr->ifr_ifindex = dev->ifindex;
4407 ifr->ifr_qlen = dev->tx_queue_len;
4411 /* dev_ioctl() should ensure this case
4423 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4425 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4428 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4429 const struct net_device_ops *ops;
4434 ops = dev->netdev_ops;
4437 case SIOCSIFFLAGS: /* Set interface flags */
4438 return dev_change_flags(dev, ifr->ifr_flags);
4440 case SIOCSIFMETRIC: /* Set the metric on the interface
4441 (currently unused) */
4444 case SIOCSIFMTU: /* Set the MTU of a device */
4445 return dev_set_mtu(dev, ifr->ifr_mtu);
4448 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4450 case SIOCSIFHWBROADCAST:
4451 if (ifr->ifr_hwaddr.sa_family != dev->type)
4453 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4454 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4455 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4459 if (ops->ndo_set_config) {
4460 if (!netif_device_present(dev))
4462 return ops->ndo_set_config(dev, &ifr->ifr_map);
4467 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4468 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4470 if (!netif_device_present(dev))
4472 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4475 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4476 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4478 if (!netif_device_present(dev))
4480 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4483 if (ifr->ifr_qlen < 0)
4485 dev->tx_queue_len = ifr->ifr_qlen;
4489 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4490 return dev_change_name(dev, ifr->ifr_newname);
4493 * Unknown or private ioctl
4496 if ((cmd >= SIOCDEVPRIVATE &&
4497 cmd <= SIOCDEVPRIVATE + 15) ||
4498 cmd == SIOCBONDENSLAVE ||
4499 cmd == SIOCBONDRELEASE ||
4500 cmd == SIOCBONDSETHWADDR ||
4501 cmd == SIOCBONDSLAVEINFOQUERY ||
4502 cmd == SIOCBONDINFOQUERY ||
4503 cmd == SIOCBONDCHANGEACTIVE ||
4504 cmd == SIOCGMIIPHY ||
4505 cmd == SIOCGMIIREG ||
4506 cmd == SIOCSMIIREG ||
4507 cmd == SIOCBRADDIF ||
4508 cmd == SIOCBRDELIF ||
4509 cmd == SIOCSHWTSTAMP ||
4510 cmd == SIOCWANDEV) {
4512 if (ops->ndo_do_ioctl) {
4513 if (netif_device_present(dev))
4514 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4526 * This function handles all "interface"-type I/O control requests. The actual
4527 * 'doing' part of this is dev_ifsioc above.
4531 * dev_ioctl - network device ioctl
4532 * @net: the applicable net namespace
4533 * @cmd: command to issue
4534 * @arg: pointer to a struct ifreq in user space
4536 * Issue ioctl functions to devices. This is normally called by the
4537 * user space syscall interfaces but can sometimes be useful for
4538 * other purposes. The return value is the return from the syscall if
4539 * positive or a negative errno code on error.
4542 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4548 /* One special case: SIOCGIFCONF takes ifconf argument
4549 and requires shared lock, because it sleeps writing
4553 if (cmd == SIOCGIFCONF) {
4555 ret = dev_ifconf(net, (char __user *) arg);
4559 if (cmd == SIOCGIFNAME)
4560 return dev_ifname(net, (struct ifreq __user *)arg);
4562 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4565 ifr.ifr_name[IFNAMSIZ-1] = 0;
4567 colon = strchr(ifr.ifr_name, ':');
4572 * See which interface the caller is talking about.
4577 * These ioctl calls:
4578 * - can be done by all.
4579 * - atomic and do not require locking.
4590 dev_load(net, ifr.ifr_name);
4592 ret = dev_ifsioc_locked(net, &ifr, cmd);
4597 if (copy_to_user(arg, &ifr,
4598 sizeof(struct ifreq)))
4604 dev_load(net, ifr.ifr_name);
4606 ret = dev_ethtool(net, &ifr);
4611 if (copy_to_user(arg, &ifr,
4612 sizeof(struct ifreq)))
4618 * These ioctl calls:
4619 * - require superuser power.
4620 * - require strict serialization.
4626 if (!capable(CAP_NET_ADMIN))
4628 dev_load(net, ifr.ifr_name);
4630 ret = dev_ifsioc(net, &ifr, cmd);
4635 if (copy_to_user(arg, &ifr,
4636 sizeof(struct ifreq)))
4642 * These ioctl calls:
4643 * - require superuser power.
4644 * - require strict serialization.
4645 * - do not return a value
4655 case SIOCSIFHWBROADCAST:
4658 case SIOCBONDENSLAVE:
4659 case SIOCBONDRELEASE:
4660 case SIOCBONDSETHWADDR:
4661 case SIOCBONDCHANGEACTIVE:
4665 if (!capable(CAP_NET_ADMIN))
4668 case SIOCBONDSLAVEINFOQUERY:
4669 case SIOCBONDINFOQUERY:
4670 dev_load(net, ifr.ifr_name);
4672 ret = dev_ifsioc(net, &ifr, cmd);
4677 /* Get the per device memory space. We can add this but
4678 * currently do not support it */
4680 /* Set the per device memory buffer space.
4681 * Not applicable in our case */
4686 * Unknown or private ioctl.
4689 if (cmd == SIOCWANDEV ||
4690 (cmd >= SIOCDEVPRIVATE &&
4691 cmd <= SIOCDEVPRIVATE + 15)) {
4692 dev_load(net, ifr.ifr_name);
4694 ret = dev_ifsioc(net, &ifr, cmd);
4696 if (!ret && copy_to_user(arg, &ifr,
4697 sizeof(struct ifreq)))
4701 /* Take care of Wireless Extensions */
4702 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4703 return wext_handle_ioctl(net, &ifr, cmd, arg);
4710 * dev_new_index - allocate an ifindex
4711 * @net: the applicable net namespace
4713 * Returns a suitable unique value for a new device interface
4714 * number. The caller must hold the rtnl semaphore or the
4715 * dev_base_lock to be sure it remains unique.
4717 static int dev_new_index(struct net *net)
4723 if (!__dev_get_by_index(net, ifindex))
4728 /* Delayed registration/unregisteration */
4729 static LIST_HEAD(net_todo_list);
4731 static void net_set_todo(struct net_device *dev)
4733 list_add_tail(&dev->todo_list, &net_todo_list);
4736 static void rollback_registered_many(struct list_head *head)
4738 struct net_device *dev, *tmp;
4740 BUG_ON(dev_boot_phase);
4743 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4744 /* Some devices call without registering
4745 * for initialization unwind. Remove those
4746 * devices and proceed with the remaining.
4748 if (dev->reg_state == NETREG_UNINITIALIZED) {
4749 pr_debug("unregister_netdevice: device %s/%p never "
4750 "was registered\n", dev->name, dev);
4753 list_del(&dev->unreg_list);
4757 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4759 /* If device is running, close it first. */
4762 /* And unlink it from device chain. */
4763 unlist_netdevice(dev);
4765 dev->reg_state = NETREG_UNREGISTERING;
4770 list_for_each_entry(dev, head, unreg_list) {
4771 /* Shutdown queueing discipline. */
4775 /* Notify protocols, that we are about to destroy
4776 this device. They should clean all the things.
4778 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4780 if (!dev->rtnl_link_ops ||
4781 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4782 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4785 * Flush the unicast and multicast chains
4790 if (dev->netdev_ops->ndo_uninit)
4791 dev->netdev_ops->ndo_uninit(dev);
4793 /* Notifier chain MUST detach us from master device. */
4794 WARN_ON(dev->master);
4796 /* Remove entries from kobject tree */
4797 netdev_unregister_kobject(dev);
4800 /* Process any work delayed until the end of the batch */
4801 dev = list_first_entry(head, struct net_device, unreg_list);
4802 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4806 list_for_each_entry(dev, head, unreg_list)
4810 static void rollback_registered(struct net_device *dev)
4814 list_add(&dev->unreg_list, &single);
4815 rollback_registered_many(&single);
4818 static void __netdev_init_queue_locks_one(struct net_device *dev,
4819 struct netdev_queue *dev_queue,
4822 spin_lock_init(&dev_queue->_xmit_lock);
4823 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4824 dev_queue->xmit_lock_owner = -1;
4827 static void netdev_init_queue_locks(struct net_device *dev)
4829 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4830 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4833 unsigned long netdev_fix_features(unsigned long features, const char *name)
4835 /* Fix illegal SG+CSUM combinations. */
4836 if ((features & NETIF_F_SG) &&
4837 !(features & NETIF_F_ALL_CSUM)) {
4839 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4840 "checksum feature.\n", name);
4841 features &= ~NETIF_F_SG;
4844 /* TSO requires that SG is present as well. */
4845 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4847 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4848 "SG feature.\n", name);
4849 features &= ~NETIF_F_TSO;
4852 if (features & NETIF_F_UFO) {
4853 if (!(features & NETIF_F_GEN_CSUM)) {
4855 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4856 "since no NETIF_F_HW_CSUM feature.\n",
4858 features &= ~NETIF_F_UFO;
4861 if (!(features & NETIF_F_SG)) {
4863 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4864 "since no NETIF_F_SG feature.\n", name);
4865 features &= ~NETIF_F_UFO;
4871 EXPORT_SYMBOL(netdev_fix_features);
4874 * netif_stacked_transfer_operstate - transfer operstate
4875 * @rootdev: the root or lower level device to transfer state from
4876 * @dev: the device to transfer operstate to
4878 * Transfer operational state from root to device. This is normally
4879 * called when a stacking relationship exists between the root
4880 * device and the device(a leaf device).
4882 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
4883 struct net_device *dev)
4885 if (rootdev->operstate == IF_OPER_DORMANT)
4886 netif_dormant_on(dev);
4888 netif_dormant_off(dev);
4890 if (netif_carrier_ok(rootdev)) {
4891 if (!netif_carrier_ok(dev))
4892 netif_carrier_on(dev);
4894 if (netif_carrier_ok(dev))
4895 netif_carrier_off(dev);
4898 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
4901 * register_netdevice - register a network device
4902 * @dev: device to register
4904 * Take a completed network device structure and add it to the kernel
4905 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4906 * chain. 0 is returned on success. A negative errno code is returned
4907 * on a failure to set up the device, or if the name is a duplicate.
4909 * Callers must hold the rtnl semaphore. You may want
4910 * register_netdev() instead of this.
4913 * The locking appears insufficient to guarantee two parallel registers
4914 * will not get the same name.
4917 int register_netdevice(struct net_device *dev)
4920 struct net *net = dev_net(dev);
4922 BUG_ON(dev_boot_phase);
4927 /* When net_device's are persistent, this will be fatal. */
4928 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4931 spin_lock_init(&dev->addr_list_lock);
4932 netdev_set_addr_lockdep_class(dev);
4933 netdev_init_queue_locks(dev);
4938 if (!dev->num_rx_queues) {
4940 * Allocate a single RX queue if driver never called
4944 dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
4950 dev->_rx->first = dev->_rx;
4951 atomic_set(&dev->_rx->count, 1);
4952 dev->num_rx_queues = 1;
4955 /* Init, if this function is available */
4956 if (dev->netdev_ops->ndo_init) {
4957 ret = dev->netdev_ops->ndo_init(dev);
4965 ret = dev_get_valid_name(dev, dev->name, 0);
4969 dev->ifindex = dev_new_index(net);
4970 if (dev->iflink == -1)
4971 dev->iflink = dev->ifindex;
4973 /* Fix illegal checksum combinations */
4974 if ((dev->features & NETIF_F_HW_CSUM) &&
4975 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4976 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4978 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4981 if ((dev->features & NETIF_F_NO_CSUM) &&
4982 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4983 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4985 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4988 dev->features = netdev_fix_features(dev->features, dev->name);
4990 /* Enable software GSO if SG is supported. */
4991 if (dev->features & NETIF_F_SG)
4992 dev->features |= NETIF_F_GSO;
4994 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
4995 ret = notifier_to_errno(ret);
4999 ret = netdev_register_kobject(dev);
5002 dev->reg_state = NETREG_REGISTERED;
5005 * Default initial state at registry is that the
5006 * device is present.
5009 set_bit(__LINK_STATE_PRESENT, &dev->state);
5011 dev_init_scheduler(dev);
5013 list_netdevice(dev);
5015 /* Notify protocols, that a new device appeared. */
5016 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5017 ret = notifier_to_errno(ret);
5019 rollback_registered(dev);
5020 dev->reg_state = NETREG_UNREGISTERED;
5023 * Prevent userspace races by waiting until the network
5024 * device is fully setup before sending notifications.
5026 if (!dev->rtnl_link_ops ||
5027 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5028 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5034 if (dev->netdev_ops->ndo_uninit)
5035 dev->netdev_ops->ndo_uninit(dev);
5038 EXPORT_SYMBOL(register_netdevice);
5041 * init_dummy_netdev - init a dummy network device for NAPI
5042 * @dev: device to init
5044 * This takes a network device structure and initialize the minimum
5045 * amount of fields so it can be used to schedule NAPI polls without
5046 * registering a full blown interface. This is to be used by drivers
5047 * that need to tie several hardware interfaces to a single NAPI
5048 * poll scheduler due to HW limitations.
5050 int init_dummy_netdev(struct net_device *dev)
5052 /* Clear everything. Note we don't initialize spinlocks
5053 * are they aren't supposed to be taken by any of the
5054 * NAPI code and this dummy netdev is supposed to be
5055 * only ever used for NAPI polls
5057 memset(dev, 0, sizeof(struct net_device));
5059 /* make sure we BUG if trying to hit standard
5060 * register/unregister code path
5062 dev->reg_state = NETREG_DUMMY;
5064 /* initialize the ref count */
5065 atomic_set(&dev->refcnt, 1);
5067 /* NAPI wants this */
5068 INIT_LIST_HEAD(&dev->napi_list);
5070 /* a dummy interface is started by default */
5071 set_bit(__LINK_STATE_PRESENT, &dev->state);
5072 set_bit(__LINK_STATE_START, &dev->state);
5076 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5080 * register_netdev - register a network device
5081 * @dev: device to register
5083 * Take a completed network device structure and add it to the kernel
5084 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5085 * chain. 0 is returned on success. A negative errno code is returned
5086 * on a failure to set up the device, or if the name is a duplicate.
5088 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5089 * and expands the device name if you passed a format string to
5092 int register_netdev(struct net_device *dev)
5099 * If the name is a format string the caller wants us to do a
5102 if (strchr(dev->name, '%')) {
5103 err = dev_alloc_name(dev, dev->name);
5108 err = register_netdevice(dev);
5113 EXPORT_SYMBOL(register_netdev);
5116 * netdev_wait_allrefs - wait until all references are gone.
5118 * This is called when unregistering network devices.
5120 * Any protocol or device that holds a reference should register
5121 * for netdevice notification, and cleanup and put back the
5122 * reference if they receive an UNREGISTER event.
5123 * We can get stuck here if buggy protocols don't correctly
5126 static void netdev_wait_allrefs(struct net_device *dev)
5128 unsigned long rebroadcast_time, warning_time;
5130 linkwatch_forget_dev(dev);
5132 rebroadcast_time = warning_time = jiffies;
5133 while (atomic_read(&dev->refcnt) != 0) {
5134 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5137 /* Rebroadcast unregister notification */
5138 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5139 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5140 * should have already handle it the first time */
5142 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5144 /* We must not have linkwatch events
5145 * pending on unregister. If this
5146 * happens, we simply run the queue
5147 * unscheduled, resulting in a noop
5150 linkwatch_run_queue();
5155 rebroadcast_time = jiffies;
5160 if (time_after(jiffies, warning_time + 10 * HZ)) {
5161 printk(KERN_EMERG "unregister_netdevice: "
5162 "waiting for %s to become free. Usage "
5164 dev->name, atomic_read(&dev->refcnt));
5165 warning_time = jiffies;
5174 * register_netdevice(x1);
5175 * register_netdevice(x2);
5177 * unregister_netdevice(y1);
5178 * unregister_netdevice(y2);
5184 * We are invoked by rtnl_unlock().
5185 * This allows us to deal with problems:
5186 * 1) We can delete sysfs objects which invoke hotplug
5187 * without deadlocking with linkwatch via keventd.
5188 * 2) Since we run with the RTNL semaphore not held, we can sleep
5189 * safely in order to wait for the netdev refcnt to drop to zero.
5191 * We must not return until all unregister events added during
5192 * the interval the lock was held have been completed.
5194 void netdev_run_todo(void)
5196 struct list_head list;
5198 /* Snapshot list, allow later requests */
5199 list_replace_init(&net_todo_list, &list);
5203 while (!list_empty(&list)) {
5204 struct net_device *dev
5205 = list_first_entry(&list, struct net_device, todo_list);
5206 list_del(&dev->todo_list);
5208 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5209 printk(KERN_ERR "network todo '%s' but state %d\n",
5210 dev->name, dev->reg_state);
5215 dev->reg_state = NETREG_UNREGISTERED;
5217 on_each_cpu(flush_backlog, dev, 1);
5219 netdev_wait_allrefs(dev);
5222 BUG_ON(atomic_read(&dev->refcnt));
5223 WARN_ON(dev->ip_ptr);
5224 WARN_ON(dev->ip6_ptr);
5225 WARN_ON(dev->dn_ptr);
5227 if (dev->destructor)
5228 dev->destructor(dev);
5230 /* Free network device */
5231 kobject_put(&dev->dev.kobj);
5236 * dev_txq_stats_fold - fold tx_queues stats
5237 * @dev: device to get statistics from
5238 * @stats: struct net_device_stats to hold results
5240 void dev_txq_stats_fold(const struct net_device *dev,
5241 struct net_device_stats *stats)
5243 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5245 struct netdev_queue *txq;
5247 for (i = 0; i < dev->num_tx_queues; i++) {
5248 txq = netdev_get_tx_queue(dev, i);
5249 tx_bytes += txq->tx_bytes;
5250 tx_packets += txq->tx_packets;
5251 tx_dropped += txq->tx_dropped;
5253 if (tx_bytes || tx_packets || tx_dropped) {
5254 stats->tx_bytes = tx_bytes;
5255 stats->tx_packets = tx_packets;
5256 stats->tx_dropped = tx_dropped;
5259 EXPORT_SYMBOL(dev_txq_stats_fold);
5262 * dev_get_stats - get network device statistics
5263 * @dev: device to get statistics from
5265 * Get network statistics from device. The device driver may provide
5266 * its own method by setting dev->netdev_ops->get_stats; otherwise
5267 * the internal statistics structure is used.
5269 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5271 const struct net_device_ops *ops = dev->netdev_ops;
5273 if (ops->ndo_get_stats)
5274 return ops->ndo_get_stats(dev);
5276 dev_txq_stats_fold(dev, &dev->stats);
5279 EXPORT_SYMBOL(dev_get_stats);
5281 static void netdev_init_one_queue(struct net_device *dev,
5282 struct netdev_queue *queue,
5288 static void netdev_init_queues(struct net_device *dev)
5290 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5291 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5292 spin_lock_init(&dev->tx_global_lock);
5296 * alloc_netdev_mq - allocate network device
5297 * @sizeof_priv: size of private data to allocate space for
5298 * @name: device name format string
5299 * @setup: callback to initialize device
5300 * @queue_count: the number of subqueues to allocate
5302 * Allocates a struct net_device with private data area for driver use
5303 * and performs basic initialization. Also allocates subquue structs
5304 * for each queue on the device at the end of the netdevice.
5306 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5307 void (*setup)(struct net_device *), unsigned int queue_count)
5309 struct netdev_queue *tx;
5310 struct net_device *dev;
5312 struct net_device *p;
5314 struct netdev_rx_queue *rx;
5318 BUG_ON(strlen(name) >= sizeof(dev->name));
5320 alloc_size = sizeof(struct net_device);
5322 /* ensure 32-byte alignment of private area */
5323 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5324 alloc_size += sizeof_priv;
5326 /* ensure 32-byte alignment of whole construct */
5327 alloc_size += NETDEV_ALIGN - 1;
5329 p = kzalloc(alloc_size, GFP_KERNEL);
5331 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5335 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5337 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5343 rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5345 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5350 atomic_set(&rx->count, queue_count);
5353 * Set a pointer to first element in the array which holds the
5356 for (i = 0; i < queue_count; i++)
5360 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5361 dev->padded = (char *)dev - (char *)p;
5363 if (dev_addr_init(dev))
5369 dev_net_set(dev, &init_net);
5372 dev->num_tx_queues = queue_count;
5373 dev->real_num_tx_queues = queue_count;
5377 dev->num_rx_queues = queue_count;
5380 dev->gso_max_size = GSO_MAX_SIZE;
5382 netdev_init_queues(dev);
5384 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5385 dev->ethtool_ntuple_list.count = 0;
5386 INIT_LIST_HEAD(&dev->napi_list);
5387 INIT_LIST_HEAD(&dev->unreg_list);
5388 INIT_LIST_HEAD(&dev->link_watch_list);
5389 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5391 strcpy(dev->name, name);
5404 EXPORT_SYMBOL(alloc_netdev_mq);
5407 * free_netdev - free network device
5410 * This function does the last stage of destroying an allocated device
5411 * interface. The reference to the device object is released.
5412 * If this is the last reference then it will be freed.
5414 void free_netdev(struct net_device *dev)
5416 struct napi_struct *p, *n;
5418 release_net(dev_net(dev));
5422 /* Flush device addresses */
5423 dev_addr_flush(dev);
5425 /* Clear ethtool n-tuple list */
5426 ethtool_ntuple_flush(dev);
5428 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5431 /* Compatibility with error handling in drivers */
5432 if (dev->reg_state == NETREG_UNINITIALIZED) {
5433 kfree((char *)dev - dev->padded);
5437 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5438 dev->reg_state = NETREG_RELEASED;
5440 /* will free via device release */
5441 put_device(&dev->dev);
5443 EXPORT_SYMBOL(free_netdev);
5446 * synchronize_net - Synchronize with packet receive processing
5448 * Wait for packets currently being received to be done.
5449 * Does not block later packets from starting.
5451 void synchronize_net(void)
5456 EXPORT_SYMBOL(synchronize_net);
5459 * unregister_netdevice_queue - remove device from the kernel
5463 * This function shuts down a device interface and removes it
5464 * from the kernel tables.
5465 * If head not NULL, device is queued to be unregistered later.
5467 * Callers must hold the rtnl semaphore. You may want
5468 * unregister_netdev() instead of this.
5471 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5476 list_move_tail(&dev->unreg_list, head);
5478 rollback_registered(dev);
5479 /* Finish processing unregister after unlock */
5483 EXPORT_SYMBOL(unregister_netdevice_queue);
5486 * unregister_netdevice_many - unregister many devices
5487 * @head: list of devices
5489 void unregister_netdevice_many(struct list_head *head)
5491 struct net_device *dev;
5493 if (!list_empty(head)) {
5494 rollback_registered_many(head);
5495 list_for_each_entry(dev, head, unreg_list)
5499 EXPORT_SYMBOL(unregister_netdevice_many);
5502 * unregister_netdev - remove device from the kernel
5505 * This function shuts down a device interface and removes it
5506 * from the kernel tables.
5508 * This is just a wrapper for unregister_netdevice that takes
5509 * the rtnl semaphore. In general you want to use this and not
5510 * unregister_netdevice.
5512 void unregister_netdev(struct net_device *dev)
5515 unregister_netdevice(dev);
5518 EXPORT_SYMBOL(unregister_netdev);
5521 * dev_change_net_namespace - move device to different nethost namespace
5523 * @net: network namespace
5524 * @pat: If not NULL name pattern to try if the current device name
5525 * is already taken in the destination network namespace.
5527 * This function shuts down a device interface and moves it
5528 * to a new network namespace. On success 0 is returned, on
5529 * a failure a netagive errno code is returned.
5531 * Callers must hold the rtnl semaphore.
5534 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5540 /* Don't allow namespace local devices to be moved. */
5542 if (dev->features & NETIF_F_NETNS_LOCAL)
5545 /* Ensure the device has been registrered */
5547 if (dev->reg_state != NETREG_REGISTERED)
5550 /* Get out if there is nothing todo */
5552 if (net_eq(dev_net(dev), net))
5555 /* Pick the destination device name, and ensure
5556 * we can use it in the destination network namespace.
5559 if (__dev_get_by_name(net, dev->name)) {
5560 /* We get here if we can't use the current device name */
5563 if (dev_get_valid_name(dev, pat, 1))
5568 * And now a mini version of register_netdevice unregister_netdevice.
5571 /* If device is running close it first. */
5574 /* And unlink it from device chain */
5576 unlist_netdevice(dev);
5580 /* Shutdown queueing discipline. */
5583 /* Notify protocols, that we are about to destroy
5584 this device. They should clean all the things.
5586 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5587 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5590 * Flush the unicast and multicast chains
5595 /* Actually switch the network namespace */
5596 dev_net_set(dev, net);
5598 /* If there is an ifindex conflict assign a new one */
5599 if (__dev_get_by_index(net, dev->ifindex)) {
5600 int iflink = (dev->iflink == dev->ifindex);
5601 dev->ifindex = dev_new_index(net);
5603 dev->iflink = dev->ifindex;
5606 /* Fixup kobjects */
5607 err = device_rename(&dev->dev, dev->name);
5610 /* Add the device back in the hashes */
5611 list_netdevice(dev);
5613 /* Notify protocols, that a new device appeared. */
5614 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5617 * Prevent userspace races by waiting until the network
5618 * device is fully setup before sending notifications.
5620 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5627 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5629 static int dev_cpu_callback(struct notifier_block *nfb,
5630 unsigned long action,
5633 struct sk_buff **list_skb;
5634 struct sk_buff *skb;
5635 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5636 struct softnet_data *sd, *oldsd;
5638 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5641 local_irq_disable();
5642 cpu = smp_processor_id();
5643 sd = &per_cpu(softnet_data, cpu);
5644 oldsd = &per_cpu(softnet_data, oldcpu);
5646 /* Find end of our completion_queue. */
5647 list_skb = &sd->completion_queue;
5649 list_skb = &(*list_skb)->next;
5650 /* Append completion queue from offline CPU. */
5651 *list_skb = oldsd->completion_queue;
5652 oldsd->completion_queue = NULL;
5654 /* Append output queue from offline CPU. */
5655 if (oldsd->output_queue) {
5656 *sd->output_queue_tailp = oldsd->output_queue;
5657 sd->output_queue_tailp = oldsd->output_queue_tailp;
5658 oldsd->output_queue = NULL;
5659 oldsd->output_queue_tailp = &oldsd->output_queue;
5662 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5665 /* Process offline CPU's input_pkt_queue */
5666 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
5668 input_queue_head_incr(oldsd);
5670 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5672 input_queue_head_incr(oldsd);
5680 * netdev_increment_features - increment feature set by one
5681 * @all: current feature set
5682 * @one: new feature set
5683 * @mask: mask feature set
5685 * Computes a new feature set after adding a device with feature set
5686 * @one to the master device with current feature set @all. Will not
5687 * enable anything that is off in @mask. Returns the new feature set.
5689 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5692 /* If device needs checksumming, downgrade to it. */
5693 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5694 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5695 else if (mask & NETIF_F_ALL_CSUM) {
5696 /* If one device supports v4/v6 checksumming, set for all. */
5697 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5698 !(all & NETIF_F_GEN_CSUM)) {
5699 all &= ~NETIF_F_ALL_CSUM;
5700 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5703 /* If one device supports hw checksumming, set for all. */
5704 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5705 all &= ~NETIF_F_ALL_CSUM;
5706 all |= NETIF_F_HW_CSUM;
5710 one |= NETIF_F_ALL_CSUM;
5712 one |= all & NETIF_F_ONE_FOR_ALL;
5713 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5714 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5718 EXPORT_SYMBOL(netdev_increment_features);
5720 static struct hlist_head *netdev_create_hash(void)
5723 struct hlist_head *hash;
5725 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5727 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5728 INIT_HLIST_HEAD(&hash[i]);
5733 /* Initialize per network namespace state */
5734 static int __net_init netdev_init(struct net *net)
5736 INIT_LIST_HEAD(&net->dev_base_head);
5738 net->dev_name_head = netdev_create_hash();
5739 if (net->dev_name_head == NULL)
5742 net->dev_index_head = netdev_create_hash();
5743 if (net->dev_index_head == NULL)
5749 kfree(net->dev_name_head);
5755 * netdev_drivername - network driver for the device
5756 * @dev: network device
5757 * @buffer: buffer for resulting name
5758 * @len: size of buffer
5760 * Determine network driver for device.
5762 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5764 const struct device_driver *driver;
5765 const struct device *parent;
5767 if (len <= 0 || !buffer)
5771 parent = dev->dev.parent;
5776 driver = parent->driver;
5777 if (driver && driver->name)
5778 strlcpy(buffer, driver->name, len);
5782 static void __net_exit netdev_exit(struct net *net)
5784 kfree(net->dev_name_head);
5785 kfree(net->dev_index_head);
5788 static struct pernet_operations __net_initdata netdev_net_ops = {
5789 .init = netdev_init,
5790 .exit = netdev_exit,
5793 static void __net_exit default_device_exit(struct net *net)
5795 struct net_device *dev, *aux;
5797 * Push all migratable network devices back to the
5798 * initial network namespace
5801 for_each_netdev_safe(net, dev, aux) {
5803 char fb_name[IFNAMSIZ];
5805 /* Ignore unmoveable devices (i.e. loopback) */
5806 if (dev->features & NETIF_F_NETNS_LOCAL)
5809 /* Leave virtual devices for the generic cleanup */
5810 if (dev->rtnl_link_ops)
5813 /* Push remaing network devices to init_net */
5814 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5815 err = dev_change_net_namespace(dev, &init_net, fb_name);
5817 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5818 __func__, dev->name, err);
5825 static void __net_exit default_device_exit_batch(struct list_head *net_list)
5827 /* At exit all network devices most be removed from a network
5828 * namespace. Do this in the reverse order of registeration.
5829 * Do this across as many network namespaces as possible to
5830 * improve batching efficiency.
5832 struct net_device *dev;
5834 LIST_HEAD(dev_kill_list);
5837 list_for_each_entry(net, net_list, exit_list) {
5838 for_each_netdev_reverse(net, dev) {
5839 if (dev->rtnl_link_ops)
5840 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
5842 unregister_netdevice_queue(dev, &dev_kill_list);
5845 unregister_netdevice_many(&dev_kill_list);
5849 static struct pernet_operations __net_initdata default_device_ops = {
5850 .exit = default_device_exit,
5851 .exit_batch = default_device_exit_batch,
5855 * Initialize the DEV module. At boot time this walks the device list and
5856 * unhooks any devices that fail to initialise (normally hardware not
5857 * present) and leaves us with a valid list of present and active devices.
5862 * This is called single threaded during boot, so no need
5863 * to take the rtnl semaphore.
5865 static int __init net_dev_init(void)
5867 int i, rc = -ENOMEM;
5869 BUG_ON(!dev_boot_phase);
5871 if (dev_proc_init())
5874 if (netdev_kobject_init())
5877 INIT_LIST_HEAD(&ptype_all);
5878 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5879 INIT_LIST_HEAD(&ptype_base[i]);
5881 if (register_pernet_subsys(&netdev_net_ops))
5885 * Initialise the packet receive queues.
5888 for_each_possible_cpu(i) {
5889 struct softnet_data *sd = &per_cpu(softnet_data, i);
5891 memset(sd, 0, sizeof(*sd));
5892 skb_queue_head_init(&sd->input_pkt_queue);
5893 skb_queue_head_init(&sd->process_queue);
5894 sd->completion_queue = NULL;
5895 INIT_LIST_HEAD(&sd->poll_list);
5896 sd->output_queue = NULL;
5897 sd->output_queue_tailp = &sd->output_queue;
5899 sd->csd.func = rps_trigger_softirq;
5905 sd->backlog.poll = process_backlog;
5906 sd->backlog.weight = weight_p;
5907 sd->backlog.gro_list = NULL;
5908 sd->backlog.gro_count = 0;
5913 /* The loopback device is special if any other network devices
5914 * is present in a network namespace the loopback device must
5915 * be present. Since we now dynamically allocate and free the
5916 * loopback device ensure this invariant is maintained by
5917 * keeping the loopback device as the first device on the
5918 * list of network devices. Ensuring the loopback devices
5919 * is the first device that appears and the last network device
5922 if (register_pernet_device(&loopback_net_ops))
5925 if (register_pernet_device(&default_device_ops))
5928 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5929 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5931 hotcpu_notifier(dev_cpu_callback, 0);
5939 subsys_initcall(net_dev_init);
5941 static int __init initialize_hashrnd(void)
5943 get_random_bytes(&hashrnd, sizeof(hashrnd));
5947 late_initcall_sync(initialize_hashrnd);