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>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <net/xfrm.h>
108 #include <linux/highmem.h>
109 #include <linux/init.h>
110 #include <linux/kmod.h>
111 #include <linux/module.h>
112 #include <linux/netpoll.h>
113 #include <linux/rcupdate.h>
114 #include <linux/delay.h>
115 #include <net/wext.h>
116 #include <net/iw_handler.h>
117 #include <asm/current.h>
118 #include <linux/audit.h>
119 #include <linux/dmaengine.h>
120 #include <linux/err.h>
121 #include <linux/ctype.h>
122 #include <linux/if_arp.h>
123 #include <linux/if_vlan.h>
124 #include <linux/ip.h>
126 #include <linux/ipv6.h>
127 #include <linux/in.h>
128 #include <linux/jhash.h>
129 #include <linux/random.h>
130 #include <trace/events/napi.h>
131 #include <trace/events/net.h>
132 #include <trace/events/skb.h>
133 #include <linux/pci.h>
134 #include <linux/inetdevice.h>
136 #include "net-sysfs.h"
138 /* Instead of increasing this, you should create a hash table. */
139 #define MAX_GRO_SKBS 8
141 /* This should be increased if a protocol with a bigger head is added. */
142 #define GRO_MAX_HEAD (MAX_HEADER + 128)
145 * The list of packet types we will receive (as opposed to discard)
146 * and the routines to invoke.
148 * Why 16. Because with 16 the only overlap we get on a hash of the
149 * low nibble of the protocol value is RARP/SNAP/X.25.
151 * NOTE: That is no longer true with the addition of VLAN tags. Not
152 * sure which should go first, but I bet it won't make much
153 * difference if we are running VLANs. The good news is that
154 * this protocol won't be in the list unless compiled in, so
155 * the average user (w/out VLANs) will not be adversely affected.
172 #define PTYPE_HASH_SIZE (16)
173 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
175 static DEFINE_SPINLOCK(ptype_lock);
176 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
177 static struct list_head ptype_all __read_mostly; /* Taps */
180 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
183 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
185 * Writers must hold the rtnl semaphore while they loop through the
186 * dev_base_head list, and hold dev_base_lock for writing when they do the
187 * actual updates. This allows pure readers to access the list even
188 * while a writer is preparing to update it.
190 * To put it another way, dev_base_lock is held for writing only to
191 * protect against pure readers; the rtnl semaphore provides the
192 * protection against other writers.
194 * See, for example usages, register_netdevice() and
195 * unregister_netdevice(), which must be called with the rtnl
198 DEFINE_RWLOCK(dev_base_lock);
199 EXPORT_SYMBOL(dev_base_lock);
201 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
203 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
204 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
207 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
209 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
212 static inline void rps_lock(struct softnet_data *sd)
215 spin_lock(&sd->input_pkt_queue.lock);
219 static inline void rps_unlock(struct softnet_data *sd)
222 spin_unlock(&sd->input_pkt_queue.lock);
226 /* Device list insertion */
227 static int list_netdevice(struct net_device *dev)
229 struct net *net = dev_net(dev);
233 write_lock_bh(&dev_base_lock);
234 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
235 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
236 hlist_add_head_rcu(&dev->index_hlist,
237 dev_index_hash(net, dev->ifindex));
238 write_unlock_bh(&dev_base_lock);
242 /* Device list removal
243 * caller must respect a RCU grace period before freeing/reusing dev
245 static void unlist_netdevice(struct net_device *dev)
249 /* Unlink dev from the device chain */
250 write_lock_bh(&dev_base_lock);
251 list_del_rcu(&dev->dev_list);
252 hlist_del_rcu(&dev->name_hlist);
253 hlist_del_rcu(&dev->index_hlist);
254 write_unlock_bh(&dev_base_lock);
261 static RAW_NOTIFIER_HEAD(netdev_chain);
264 * Device drivers call our routines to queue packets here. We empty the
265 * queue in the local softnet handler.
268 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
269 EXPORT_PER_CPU_SYMBOL(softnet_data);
271 #ifdef CONFIG_LOCKDEP
273 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
274 * according to dev->type
276 static const unsigned short netdev_lock_type[] =
277 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
278 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
279 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
280 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
281 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
282 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
283 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
284 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
285 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
286 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
287 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
288 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
289 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
290 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
291 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
292 ARPHRD_VOID, ARPHRD_NONE};
294 static const char *const netdev_lock_name[] =
295 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
296 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
297 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
298 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
299 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
300 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
301 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
302 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
303 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
304 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
305 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
306 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
307 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
308 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
309 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
310 "_xmit_VOID", "_xmit_NONE"};
312 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
313 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
315 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
319 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
320 if (netdev_lock_type[i] == dev_type)
322 /* the last key is used by default */
323 return ARRAY_SIZE(netdev_lock_type) - 1;
326 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
327 unsigned short dev_type)
331 i = netdev_lock_pos(dev_type);
332 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
333 netdev_lock_name[i]);
336 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
340 i = netdev_lock_pos(dev->type);
341 lockdep_set_class_and_name(&dev->addr_list_lock,
342 &netdev_addr_lock_key[i],
343 netdev_lock_name[i]);
346 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
347 unsigned short dev_type)
350 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
355 /*******************************************************************************
357 Protocol management and registration routines
359 *******************************************************************************/
362 * Add a protocol ID to the list. Now that the input handler is
363 * smarter we can dispense with all the messy stuff that used to be
366 * BEWARE!!! Protocol handlers, mangling input packets,
367 * MUST BE last in hash buckets and checking protocol handlers
368 * MUST start from promiscuous ptype_all chain in net_bh.
369 * It is true now, do not change it.
370 * Explanation follows: if protocol handler, mangling packet, will
371 * be the first on list, it is not able to sense, that packet
372 * is cloned and should be copied-on-write, so that it will
373 * change it and subsequent readers will get broken packet.
377 static inline struct list_head *ptype_head(const struct packet_type *pt)
379 if (pt->type == htons(ETH_P_ALL))
382 return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
386 * dev_add_pack - add packet handler
387 * @pt: packet type declaration
389 * Add a protocol handler to the networking stack. The passed &packet_type
390 * is linked into kernel lists and may not be freed until it has been
391 * removed from the kernel lists.
393 * This call does not sleep therefore it can not
394 * guarantee all CPU's that are in middle of receiving packets
395 * will see the new packet type (until the next received packet).
398 void dev_add_pack(struct packet_type *pt)
400 struct list_head *head = ptype_head(pt);
402 spin_lock(&ptype_lock);
403 list_add_rcu(&pt->list, head);
404 spin_unlock(&ptype_lock);
406 EXPORT_SYMBOL(dev_add_pack);
409 * __dev_remove_pack - remove packet handler
410 * @pt: packet type declaration
412 * Remove a protocol handler that was previously added to the kernel
413 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
414 * from the kernel lists and can be freed or reused once this function
417 * The packet type might still be in use by receivers
418 * and must not be freed until after all the CPU's have gone
419 * through a quiescent state.
421 void __dev_remove_pack(struct packet_type *pt)
423 struct list_head *head = ptype_head(pt);
424 struct packet_type *pt1;
426 spin_lock(&ptype_lock);
428 list_for_each_entry(pt1, head, list) {
430 list_del_rcu(&pt->list);
435 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
437 spin_unlock(&ptype_lock);
439 EXPORT_SYMBOL(__dev_remove_pack);
442 * dev_remove_pack - remove packet handler
443 * @pt: packet type declaration
445 * Remove a protocol handler that was previously added to the kernel
446 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
447 * from the kernel lists and can be freed or reused once this function
450 * This call sleeps to guarantee that no CPU is looking at the packet
453 void dev_remove_pack(struct packet_type *pt)
455 __dev_remove_pack(pt);
459 EXPORT_SYMBOL(dev_remove_pack);
461 /******************************************************************************
463 Device Boot-time Settings Routines
465 *******************************************************************************/
467 /* Boot time configuration table */
468 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
471 * netdev_boot_setup_add - add new setup entry
472 * @name: name of the device
473 * @map: configured settings for the device
475 * Adds new setup entry to the dev_boot_setup list. The function
476 * returns 0 on error and 1 on success. This is a generic routine to
479 static int netdev_boot_setup_add(char *name, struct ifmap *map)
481 struct netdev_boot_setup *s;
485 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
486 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
487 memset(s[i].name, 0, sizeof(s[i].name));
488 strlcpy(s[i].name, name, IFNAMSIZ);
489 memcpy(&s[i].map, map, sizeof(s[i].map));
494 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
498 * netdev_boot_setup_check - check boot time settings
499 * @dev: the netdevice
501 * Check boot time settings for the device.
502 * The found settings are set for the device to be used
503 * later in the device probing.
504 * Returns 0 if no settings found, 1 if they are.
506 int netdev_boot_setup_check(struct net_device *dev)
508 struct netdev_boot_setup *s = dev_boot_setup;
511 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
512 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
513 !strcmp(dev->name, s[i].name)) {
514 dev->irq = s[i].map.irq;
515 dev->base_addr = s[i].map.base_addr;
516 dev->mem_start = s[i].map.mem_start;
517 dev->mem_end = s[i].map.mem_end;
523 EXPORT_SYMBOL(netdev_boot_setup_check);
527 * netdev_boot_base - get address from boot time settings
528 * @prefix: prefix for network device
529 * @unit: id for network device
531 * Check boot time settings for the base address of device.
532 * The found settings are set for the device to be used
533 * later in the device probing.
534 * Returns 0 if no settings found.
536 unsigned long netdev_boot_base(const char *prefix, int unit)
538 const struct netdev_boot_setup *s = dev_boot_setup;
542 sprintf(name, "%s%d", prefix, unit);
545 * If device already registered then return base of 1
546 * to indicate not to probe for this interface
548 if (__dev_get_by_name(&init_net, name))
551 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
552 if (!strcmp(name, s[i].name))
553 return s[i].map.base_addr;
558 * Saves at boot time configured settings for any netdevice.
560 int __init netdev_boot_setup(char *str)
565 str = get_options(str, ARRAY_SIZE(ints), ints);
570 memset(&map, 0, sizeof(map));
574 map.base_addr = ints[2];
576 map.mem_start = ints[3];
578 map.mem_end = ints[4];
580 /* Add new entry to the list */
581 return netdev_boot_setup_add(str, &map);
584 __setup("netdev=", netdev_boot_setup);
586 /*******************************************************************************
588 Device Interface Subroutines
590 *******************************************************************************/
593 * __dev_get_by_name - find a device by its name
594 * @net: the applicable net namespace
595 * @name: name to find
597 * Find an interface by name. Must be called under RTNL semaphore
598 * or @dev_base_lock. If the name is found a pointer to the device
599 * is returned. If the name is not found then %NULL is returned. The
600 * reference counters are not incremented so the caller must be
601 * careful with locks.
604 struct net_device *__dev_get_by_name(struct net *net, const char *name)
606 struct hlist_node *p;
607 struct net_device *dev;
608 struct hlist_head *head = dev_name_hash(net, name);
610 hlist_for_each_entry(dev, p, head, name_hlist)
611 if (!strncmp(dev->name, name, IFNAMSIZ))
616 EXPORT_SYMBOL(__dev_get_by_name);
619 * dev_get_by_name_rcu - find a device by its name
620 * @net: the applicable net namespace
621 * @name: name to find
623 * Find an interface by name.
624 * If the name is found a pointer to the device is returned.
625 * If the name is not found then %NULL is returned.
626 * The reference counters are not incremented so the caller must be
627 * careful with locks. The caller must hold RCU lock.
630 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
632 struct hlist_node *p;
633 struct net_device *dev;
634 struct hlist_head *head = dev_name_hash(net, name);
636 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
637 if (!strncmp(dev->name, name, IFNAMSIZ))
642 EXPORT_SYMBOL(dev_get_by_name_rcu);
645 * dev_get_by_name - find a device by its name
646 * @net: the applicable net namespace
647 * @name: name to find
649 * Find an interface by name. This can be called from any
650 * context and does its own locking. The returned handle has
651 * the usage count incremented and the caller must use dev_put() to
652 * release it when it is no longer needed. %NULL is returned if no
653 * matching device is found.
656 struct net_device *dev_get_by_name(struct net *net, const char *name)
658 struct net_device *dev;
661 dev = dev_get_by_name_rcu(net, name);
667 EXPORT_SYMBOL(dev_get_by_name);
670 * __dev_get_by_index - find a device by its ifindex
671 * @net: the applicable net namespace
672 * @ifindex: index of device
674 * Search for an interface by index. Returns %NULL if the device
675 * is not found or a pointer to the device. The device has not
676 * had its reference counter increased so the caller must be careful
677 * about locking. The caller must hold either the RTNL semaphore
681 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
683 struct hlist_node *p;
684 struct net_device *dev;
685 struct hlist_head *head = dev_index_hash(net, ifindex);
687 hlist_for_each_entry(dev, p, head, index_hlist)
688 if (dev->ifindex == ifindex)
693 EXPORT_SYMBOL(__dev_get_by_index);
696 * dev_get_by_index_rcu - find a device by its ifindex
697 * @net: the applicable net namespace
698 * @ifindex: index of device
700 * Search for an interface by index. Returns %NULL if the device
701 * is not found or a pointer to the device. The device has not
702 * had its reference counter increased so the caller must be careful
703 * about locking. The caller must hold RCU lock.
706 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
708 struct hlist_node *p;
709 struct net_device *dev;
710 struct hlist_head *head = dev_index_hash(net, ifindex);
712 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
713 if (dev->ifindex == ifindex)
718 EXPORT_SYMBOL(dev_get_by_index_rcu);
722 * dev_get_by_index - find a device by its ifindex
723 * @net: the applicable net namespace
724 * @ifindex: index of device
726 * Search for an interface by index. Returns NULL if the device
727 * is not found or a pointer to the device. The device returned has
728 * had a reference added and the pointer is safe until the user calls
729 * dev_put to indicate they have finished with it.
732 struct net_device *dev_get_by_index(struct net *net, int ifindex)
734 struct net_device *dev;
737 dev = dev_get_by_index_rcu(net, ifindex);
743 EXPORT_SYMBOL(dev_get_by_index);
746 * dev_getbyhwaddr - find a device by its hardware address
747 * @net: the applicable net namespace
748 * @type: media type of device
749 * @ha: hardware address
751 * Search for an interface by MAC address. Returns NULL if the device
752 * is not found or a pointer to the device. The caller must hold the
753 * rtnl semaphore. The returned device has not had its ref count increased
754 * and the caller must therefore be careful about locking
757 * If the API was consistent this would be __dev_get_by_hwaddr
760 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
762 struct net_device *dev;
766 for_each_netdev(net, dev)
767 if (dev->type == type &&
768 !memcmp(dev->dev_addr, ha, dev->addr_len))
773 EXPORT_SYMBOL(dev_getbyhwaddr);
775 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
777 struct net_device *dev;
780 for_each_netdev(net, dev)
781 if (dev->type == type)
786 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
788 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
790 struct net_device *dev, *ret = NULL;
793 for_each_netdev_rcu(net, dev)
794 if (dev->type == type) {
802 EXPORT_SYMBOL(dev_getfirstbyhwtype);
805 * dev_get_by_flags_rcu - find any device with given flags
806 * @net: the applicable net namespace
807 * @if_flags: IFF_* values
808 * @mask: bitmask of bits in if_flags to check
810 * Search for any interface with the given flags. Returns NULL if a device
811 * is not found or a pointer to the device. Must be called inside
812 * rcu_read_lock(), and result refcount is unchanged.
815 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
818 struct net_device *dev, *ret;
821 for_each_netdev_rcu(net, dev) {
822 if (((dev->flags ^ if_flags) & mask) == 0) {
829 EXPORT_SYMBOL(dev_get_by_flags_rcu);
832 * dev_valid_name - check if name is okay for network device
835 * Network device names need to be valid file names to
836 * to allow sysfs to work. We also disallow any kind of
839 int dev_valid_name(const char *name)
843 if (strlen(name) >= IFNAMSIZ)
845 if (!strcmp(name, ".") || !strcmp(name, ".."))
849 if (*name == '/' || isspace(*name))
855 EXPORT_SYMBOL(dev_valid_name);
858 * __dev_alloc_name - allocate a name for a device
859 * @net: network namespace to allocate the device name in
860 * @name: name format string
861 * @buf: scratch buffer and result name string
863 * Passed a format string - eg "lt%d" it will try and find a suitable
864 * id. It scans list of devices to build up a free map, then chooses
865 * the first empty slot. The caller must hold the dev_base or rtnl lock
866 * while allocating the name and adding the device in order to avoid
868 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
869 * Returns the number of the unit assigned or a negative errno code.
872 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
876 const int max_netdevices = 8*PAGE_SIZE;
877 unsigned long *inuse;
878 struct net_device *d;
880 p = strnchr(name, IFNAMSIZ-1, '%');
883 * Verify the string as this thing may have come from
884 * the user. There must be either one "%d" and no other "%"
887 if (p[1] != 'd' || strchr(p + 2, '%'))
890 /* Use one page as a bit array of possible slots */
891 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
895 for_each_netdev(net, d) {
896 if (!sscanf(d->name, name, &i))
898 if (i < 0 || i >= max_netdevices)
901 /* avoid cases where sscanf is not exact inverse of printf */
902 snprintf(buf, IFNAMSIZ, name, i);
903 if (!strncmp(buf, d->name, IFNAMSIZ))
907 i = find_first_zero_bit(inuse, max_netdevices);
908 free_page((unsigned long) inuse);
912 snprintf(buf, IFNAMSIZ, name, i);
913 if (!__dev_get_by_name(net, buf))
916 /* It is possible to run out of possible slots
917 * when the name is long and there isn't enough space left
918 * for the digits, or if all bits are used.
924 * dev_alloc_name - allocate a name for a device
926 * @name: name format string
928 * Passed a format string - eg "lt%d" it will try and find a suitable
929 * id. It scans list of devices to build up a free map, then chooses
930 * the first empty slot. The caller must hold the dev_base or rtnl lock
931 * while allocating the name and adding the device in order to avoid
933 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
934 * Returns the number of the unit assigned or a negative errno code.
937 int dev_alloc_name(struct net_device *dev, const char *name)
943 BUG_ON(!dev_net(dev));
945 ret = __dev_alloc_name(net, name, buf);
947 strlcpy(dev->name, buf, IFNAMSIZ);
950 EXPORT_SYMBOL(dev_alloc_name);
952 static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt)
956 BUG_ON(!dev_net(dev));
959 if (!dev_valid_name(name))
962 if (fmt && strchr(name, '%'))
963 return dev_alloc_name(dev, name);
964 else if (__dev_get_by_name(net, name))
966 else if (dev->name != name)
967 strlcpy(dev->name, name, IFNAMSIZ);
973 * dev_change_name - change name of a device
975 * @newname: name (or format string) must be at least IFNAMSIZ
977 * Change name of a device, can pass format strings "eth%d".
980 int dev_change_name(struct net_device *dev, const char *newname)
982 char oldname[IFNAMSIZ];
988 BUG_ON(!dev_net(dev));
991 if (dev->flags & IFF_UP)
994 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
997 memcpy(oldname, dev->name, IFNAMSIZ);
999 err = dev_get_valid_name(dev, newname, 1);
1004 ret = device_rename(&dev->dev, dev->name);
1006 memcpy(dev->name, oldname, IFNAMSIZ);
1010 write_lock_bh(&dev_base_lock);
1011 hlist_del(&dev->name_hlist);
1012 write_unlock_bh(&dev_base_lock);
1016 write_lock_bh(&dev_base_lock);
1017 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1018 write_unlock_bh(&dev_base_lock);
1020 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1021 ret = notifier_to_errno(ret);
1024 /* err >= 0 after dev_alloc_name() or stores the first errno */
1027 memcpy(dev->name, oldname, IFNAMSIZ);
1031 "%s: name change rollback failed: %d.\n",
1040 * dev_set_alias - change ifalias of a device
1042 * @alias: name up to IFALIASZ
1043 * @len: limit of bytes to copy from info
1045 * Set ifalias for a device,
1047 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1051 if (len >= IFALIASZ)
1056 kfree(dev->ifalias);
1057 dev->ifalias = NULL;
1062 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1066 strlcpy(dev->ifalias, alias, len+1);
1072 * netdev_features_change - device changes features
1073 * @dev: device to cause notification
1075 * Called to indicate a device has changed features.
1077 void netdev_features_change(struct net_device *dev)
1079 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1081 EXPORT_SYMBOL(netdev_features_change);
1084 * netdev_state_change - device changes state
1085 * @dev: device to cause notification
1087 * Called to indicate a device has changed state. This function calls
1088 * the notifier chains for netdev_chain and sends a NEWLINK message
1089 * to the routing socket.
1091 void netdev_state_change(struct net_device *dev)
1093 if (dev->flags & IFF_UP) {
1094 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1095 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1098 EXPORT_SYMBOL(netdev_state_change);
1100 int netdev_bonding_change(struct net_device *dev, unsigned long event)
1102 return call_netdevice_notifiers(event, dev);
1104 EXPORT_SYMBOL(netdev_bonding_change);
1107 * dev_load - load a network module
1108 * @net: the applicable net namespace
1109 * @name: name of interface
1111 * If a network interface is not present and the process has suitable
1112 * privileges this function loads the module. If module loading is not
1113 * available in this kernel then it becomes a nop.
1116 void dev_load(struct net *net, const char *name)
1118 struct net_device *dev;
1121 dev = dev_get_by_name_rcu(net, name);
1124 if (!dev && capable(CAP_NET_ADMIN))
1125 request_module("%s", name);
1127 EXPORT_SYMBOL(dev_load);
1129 static int __dev_open(struct net_device *dev)
1131 const struct net_device_ops *ops = dev->netdev_ops;
1137 * Is it even present?
1139 if (!netif_device_present(dev))
1142 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1143 ret = notifier_to_errno(ret);
1148 * Call device private open method
1150 set_bit(__LINK_STATE_START, &dev->state);
1152 if (ops->ndo_validate_addr)
1153 ret = ops->ndo_validate_addr(dev);
1155 if (!ret && ops->ndo_open)
1156 ret = ops->ndo_open(dev);
1159 * If it went open OK then:
1163 clear_bit(__LINK_STATE_START, &dev->state);
1168 dev->flags |= IFF_UP;
1173 net_dmaengine_get();
1176 * Initialize multicasting status
1178 dev_set_rx_mode(dev);
1181 * Wakeup transmit queue engine
1190 * dev_open - prepare an interface for use.
1191 * @dev: device to open
1193 * Takes a device from down to up state. The device's private open
1194 * function is invoked and then the multicast lists are loaded. Finally
1195 * the device is moved into the up state and a %NETDEV_UP message is
1196 * sent to the netdev notifier chain.
1198 * Calling this function on an active interface is a nop. On a failure
1199 * a negative errno code is returned.
1201 int dev_open(struct net_device *dev)
1208 if (dev->flags & IFF_UP)
1214 ret = __dev_open(dev);
1219 * ... and announce new interface.
1221 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1222 call_netdevice_notifiers(NETDEV_UP, dev);
1226 EXPORT_SYMBOL(dev_open);
1228 static int __dev_close(struct net_device *dev)
1230 const struct net_device_ops *ops = dev->netdev_ops;
1236 * Tell people we are going down, so that they can
1237 * prepare to death, when device is still operating.
1239 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1241 clear_bit(__LINK_STATE_START, &dev->state);
1243 /* Synchronize to scheduled poll. We cannot touch poll list,
1244 * it can be even on different cpu. So just clear netif_running().
1246 * dev->stop() will invoke napi_disable() on all of it's
1247 * napi_struct instances on this device.
1249 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1251 dev_deactivate(dev);
1254 * Call the device specific close. This cannot fail.
1255 * Only if device is UP
1257 * We allow it to be called even after a DETACH hot-plug
1264 * Device is now down.
1267 dev->flags &= ~IFF_UP;
1272 net_dmaengine_put();
1278 * dev_close - shutdown an interface.
1279 * @dev: device to shutdown
1281 * This function moves an active device into down state. A
1282 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1283 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1286 int dev_close(struct net_device *dev)
1288 if (!(dev->flags & IFF_UP))
1294 * Tell people we are down
1296 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1297 call_netdevice_notifiers(NETDEV_DOWN, dev);
1301 EXPORT_SYMBOL(dev_close);
1305 * dev_disable_lro - disable Large Receive Offload on a device
1308 * Disable Large Receive Offload (LRO) on a net device. Must be
1309 * called under RTNL. This is needed if received packets may be
1310 * forwarded to another interface.
1312 void dev_disable_lro(struct net_device *dev)
1314 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1315 dev->ethtool_ops->set_flags) {
1316 u32 flags = dev->ethtool_ops->get_flags(dev);
1317 if (flags & ETH_FLAG_LRO) {
1318 flags &= ~ETH_FLAG_LRO;
1319 dev->ethtool_ops->set_flags(dev, flags);
1322 WARN_ON(dev->features & NETIF_F_LRO);
1324 EXPORT_SYMBOL(dev_disable_lro);
1327 static int dev_boot_phase = 1;
1330 * Device change register/unregister. These are not inline or static
1331 * as we export them to the world.
1335 * register_netdevice_notifier - register a network notifier block
1338 * Register a notifier to be called when network device events occur.
1339 * The notifier passed is linked into the kernel structures and must
1340 * not be reused until it has been unregistered. A negative errno code
1341 * is returned on a failure.
1343 * When registered all registration and up events are replayed
1344 * to the new notifier to allow device to have a race free
1345 * view of the network device list.
1348 int register_netdevice_notifier(struct notifier_block *nb)
1350 struct net_device *dev;
1351 struct net_device *last;
1356 err = raw_notifier_chain_register(&netdev_chain, nb);
1362 for_each_netdev(net, dev) {
1363 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1364 err = notifier_to_errno(err);
1368 if (!(dev->flags & IFF_UP))
1371 nb->notifier_call(nb, NETDEV_UP, dev);
1382 for_each_netdev(net, dev) {
1386 if (dev->flags & IFF_UP) {
1387 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1388 nb->notifier_call(nb, NETDEV_DOWN, dev);
1390 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1391 nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1395 raw_notifier_chain_unregister(&netdev_chain, nb);
1398 EXPORT_SYMBOL(register_netdevice_notifier);
1401 * unregister_netdevice_notifier - unregister a network notifier block
1404 * Unregister a notifier previously registered by
1405 * register_netdevice_notifier(). The notifier is unlinked into the
1406 * kernel structures and may then be reused. A negative errno code
1407 * is returned on a failure.
1410 int unregister_netdevice_notifier(struct notifier_block *nb)
1415 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1419 EXPORT_SYMBOL(unregister_netdevice_notifier);
1422 * call_netdevice_notifiers - call all network notifier blocks
1423 * @val: value passed unmodified to notifier function
1424 * @dev: net_device pointer passed unmodified to notifier function
1426 * Call all network notifier blocks. Parameters and return value
1427 * are as for raw_notifier_call_chain().
1430 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1433 return raw_notifier_call_chain(&netdev_chain, val, dev);
1436 /* When > 0 there are consumers of rx skb time stamps */
1437 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1439 void net_enable_timestamp(void)
1441 atomic_inc(&netstamp_needed);
1443 EXPORT_SYMBOL(net_enable_timestamp);
1445 void net_disable_timestamp(void)
1447 atomic_dec(&netstamp_needed);
1449 EXPORT_SYMBOL(net_disable_timestamp);
1451 static inline void net_timestamp_set(struct sk_buff *skb)
1453 if (atomic_read(&netstamp_needed))
1454 __net_timestamp(skb);
1456 skb->tstamp.tv64 = 0;
1459 static inline void net_timestamp_check(struct sk_buff *skb)
1461 if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
1462 __net_timestamp(skb);
1466 * dev_forward_skb - loopback an skb to another netif
1468 * @dev: destination network device
1469 * @skb: buffer to forward
1472 * NET_RX_SUCCESS (no congestion)
1473 * NET_RX_DROP (packet was dropped, but freed)
1475 * dev_forward_skb can be used for injecting an skb from the
1476 * start_xmit function of one device into the receive queue
1477 * of another device.
1479 * The receiving device may be in another namespace, so
1480 * we have to clear all information in the skb that could
1481 * impact namespace isolation.
1483 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1488 if (unlikely(!(dev->flags & IFF_UP) ||
1489 (skb->len > (dev->mtu + dev->hard_header_len + VLAN_HLEN)))) {
1490 atomic_long_inc(&dev->rx_dropped);
1494 skb_set_dev(skb, dev);
1495 skb->tstamp.tv64 = 0;
1496 skb->pkt_type = PACKET_HOST;
1497 skb->protocol = eth_type_trans(skb, dev);
1498 return netif_rx(skb);
1500 EXPORT_SYMBOL_GPL(dev_forward_skb);
1503 * Support routine. Sends outgoing frames to any network
1504 * taps currently in use.
1507 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1509 struct packet_type *ptype;
1511 #ifdef CONFIG_NET_CLS_ACT
1512 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1513 net_timestamp_set(skb);
1515 net_timestamp_set(skb);
1519 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1520 /* Never send packets back to the socket
1521 * they originated from - MvS (miquels@drinkel.ow.org)
1523 if ((ptype->dev == dev || !ptype->dev) &&
1524 (ptype->af_packet_priv == NULL ||
1525 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1526 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1530 /* skb->nh should be correctly
1531 set by sender, so that the second statement is
1532 just protection against buggy protocols.
1534 skb_reset_mac_header(skb2);
1536 if (skb_network_header(skb2) < skb2->data ||
1537 skb2->network_header > skb2->tail) {
1538 if (net_ratelimit())
1539 printk(KERN_CRIT "protocol %04x is "
1541 ntohs(skb2->protocol),
1543 skb_reset_network_header(skb2);
1546 skb2->transport_header = skb2->network_header;
1547 skb2->pkt_type = PACKET_OUTGOING;
1548 ptype->func(skb2, skb->dev, ptype, skb->dev);
1555 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1556 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1558 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1560 if (txq < 1 || txq > dev->num_tx_queues)
1563 if (dev->reg_state == NETREG_REGISTERED) {
1566 if (txq < dev->real_num_tx_queues)
1567 qdisc_reset_all_tx_gt(dev, txq);
1570 dev->real_num_tx_queues = txq;
1573 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1577 * netif_set_real_num_rx_queues - set actual number of RX queues used
1578 * @dev: Network device
1579 * @rxq: Actual number of RX queues
1581 * This must be called either with the rtnl_lock held or before
1582 * registration of the net device. Returns 0 on success, or a
1583 * negative error code. If called before registration, it always
1586 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1590 if (rxq < 1 || rxq > dev->num_rx_queues)
1593 if (dev->reg_state == NETREG_REGISTERED) {
1596 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1602 dev->real_num_rx_queues = rxq;
1605 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1608 static inline void __netif_reschedule(struct Qdisc *q)
1610 struct softnet_data *sd;
1611 unsigned long flags;
1613 local_irq_save(flags);
1614 sd = &__get_cpu_var(softnet_data);
1615 q->next_sched = NULL;
1616 *sd->output_queue_tailp = q;
1617 sd->output_queue_tailp = &q->next_sched;
1618 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1619 local_irq_restore(flags);
1622 void __netif_schedule(struct Qdisc *q)
1624 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1625 __netif_reschedule(q);
1627 EXPORT_SYMBOL(__netif_schedule);
1629 void dev_kfree_skb_irq(struct sk_buff *skb)
1631 if (atomic_dec_and_test(&skb->users)) {
1632 struct softnet_data *sd;
1633 unsigned long flags;
1635 local_irq_save(flags);
1636 sd = &__get_cpu_var(softnet_data);
1637 skb->next = sd->completion_queue;
1638 sd->completion_queue = skb;
1639 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1640 local_irq_restore(flags);
1643 EXPORT_SYMBOL(dev_kfree_skb_irq);
1645 void dev_kfree_skb_any(struct sk_buff *skb)
1647 if (in_irq() || irqs_disabled())
1648 dev_kfree_skb_irq(skb);
1652 EXPORT_SYMBOL(dev_kfree_skb_any);
1656 * netif_device_detach - mark device as removed
1657 * @dev: network device
1659 * Mark device as removed from system and therefore no longer available.
1661 void netif_device_detach(struct net_device *dev)
1663 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1664 netif_running(dev)) {
1665 netif_tx_stop_all_queues(dev);
1668 EXPORT_SYMBOL(netif_device_detach);
1671 * netif_device_attach - mark device as attached
1672 * @dev: network device
1674 * Mark device as attached from system and restart if needed.
1676 void netif_device_attach(struct net_device *dev)
1678 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1679 netif_running(dev)) {
1680 netif_tx_wake_all_queues(dev);
1681 __netdev_watchdog_up(dev);
1684 EXPORT_SYMBOL(netif_device_attach);
1686 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1688 return ((features & NETIF_F_NO_CSUM) ||
1689 ((features & NETIF_F_V4_CSUM) &&
1690 protocol == htons(ETH_P_IP)) ||
1691 ((features & NETIF_F_V6_CSUM) &&
1692 protocol == htons(ETH_P_IPV6)) ||
1693 ((features & NETIF_F_FCOE_CRC) &&
1694 protocol == htons(ETH_P_FCOE)));
1697 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1699 __be16 protocol = skb->protocol;
1700 int features = dev->features;
1702 if (vlan_tx_tag_present(skb)) {
1703 features &= dev->vlan_features;
1704 } else if (protocol == htons(ETH_P_8021Q)) {
1705 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1706 protocol = veh->h_vlan_encapsulated_proto;
1707 features &= dev->vlan_features;
1710 return can_checksum_protocol(features, protocol);
1714 * skb_dev_set -- assign a new device to a buffer
1715 * @skb: buffer for the new device
1716 * @dev: network device
1718 * If an skb is owned by a device already, we have to reset
1719 * all data private to the namespace a device belongs to
1720 * before assigning it a new device.
1722 #ifdef CONFIG_NET_NS
1723 void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
1726 if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
1729 skb_init_secmark(skb);
1733 skb->ipvs_property = 0;
1734 #ifdef CONFIG_NET_SCHED
1740 EXPORT_SYMBOL(skb_set_dev);
1741 #endif /* CONFIG_NET_NS */
1744 * Invalidate hardware checksum when packet is to be mangled, and
1745 * complete checksum manually on outgoing path.
1747 int skb_checksum_help(struct sk_buff *skb)
1750 int ret = 0, offset;
1752 if (skb->ip_summed == CHECKSUM_COMPLETE)
1753 goto out_set_summed;
1755 if (unlikely(skb_shinfo(skb)->gso_size)) {
1756 /* Let GSO fix up the checksum. */
1757 goto out_set_summed;
1760 offset = skb->csum_start - skb_headroom(skb);
1761 BUG_ON(offset >= skb_headlen(skb));
1762 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1764 offset += skb->csum_offset;
1765 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1767 if (skb_cloned(skb) &&
1768 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1769 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1774 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1776 skb->ip_summed = CHECKSUM_NONE;
1780 EXPORT_SYMBOL(skb_checksum_help);
1783 * skb_gso_segment - Perform segmentation on skb.
1784 * @skb: buffer to segment
1785 * @features: features for the output path (see dev->features)
1787 * This function segments the given skb and returns a list of segments.
1789 * It may return NULL if the skb requires no segmentation. This is
1790 * only possible when GSO is used for verifying header integrity.
1792 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1794 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1795 struct packet_type *ptype;
1796 __be16 type = skb->protocol;
1797 int vlan_depth = ETH_HLEN;
1800 while (type == htons(ETH_P_8021Q)) {
1801 struct vlan_hdr *vh;
1803 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1804 return ERR_PTR(-EINVAL);
1806 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
1807 type = vh->h_vlan_encapsulated_proto;
1808 vlan_depth += VLAN_HLEN;
1811 skb_reset_mac_header(skb);
1812 skb->mac_len = skb->network_header - skb->mac_header;
1813 __skb_pull(skb, skb->mac_len);
1815 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1816 struct net_device *dev = skb->dev;
1817 struct ethtool_drvinfo info = {};
1819 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1820 dev->ethtool_ops->get_drvinfo(dev, &info);
1822 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n",
1823 info.driver, dev ? dev->features : 0L,
1824 skb->sk ? skb->sk->sk_route_caps : 0L,
1825 skb->len, skb->data_len, skb->ip_summed);
1827 if (skb_header_cloned(skb) &&
1828 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1829 return ERR_PTR(err);
1833 list_for_each_entry_rcu(ptype,
1834 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1835 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1836 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1837 err = ptype->gso_send_check(skb);
1838 segs = ERR_PTR(err);
1839 if (err || skb_gso_ok(skb, features))
1841 __skb_push(skb, (skb->data -
1842 skb_network_header(skb)));
1844 segs = ptype->gso_segment(skb, features);
1850 __skb_push(skb, skb->data - skb_mac_header(skb));
1854 EXPORT_SYMBOL(skb_gso_segment);
1856 /* Take action when hardware reception checksum errors are detected. */
1858 void netdev_rx_csum_fault(struct net_device *dev)
1860 if (net_ratelimit()) {
1861 printk(KERN_ERR "%s: hw csum failure.\n",
1862 dev ? dev->name : "<unknown>");
1866 EXPORT_SYMBOL(netdev_rx_csum_fault);
1869 /* Actually, we should eliminate this check as soon as we know, that:
1870 * 1. IOMMU is present and allows to map all the memory.
1871 * 2. No high memory really exists on this machine.
1874 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1876 #ifdef CONFIG_HIGHMEM
1878 if (!(dev->features & NETIF_F_HIGHDMA)) {
1879 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1880 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1884 if (PCI_DMA_BUS_IS_PHYS) {
1885 struct device *pdev = dev->dev.parent;
1889 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1890 dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
1891 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
1900 void (*destructor)(struct sk_buff *skb);
1903 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1905 static void dev_gso_skb_destructor(struct sk_buff *skb)
1907 struct dev_gso_cb *cb;
1910 struct sk_buff *nskb = skb->next;
1912 skb->next = nskb->next;
1915 } while (skb->next);
1917 cb = DEV_GSO_CB(skb);
1919 cb->destructor(skb);
1923 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1924 * @skb: buffer to segment
1926 * This function segments the given skb and stores the list of segments
1929 static int dev_gso_segment(struct sk_buff *skb)
1931 struct net_device *dev = skb->dev;
1932 struct sk_buff *segs;
1933 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1936 segs = skb_gso_segment(skb, features);
1938 /* Verifying header integrity only. */
1943 return PTR_ERR(segs);
1946 DEV_GSO_CB(skb)->destructor = skb->destructor;
1947 skb->destructor = dev_gso_skb_destructor;
1953 * Try to orphan skb early, right before transmission by the device.
1954 * We cannot orphan skb if tx timestamp is requested or the sk-reference
1955 * is needed on driver level for other reasons, e.g. see net/can/raw.c
1957 static inline void skb_orphan_try(struct sk_buff *skb)
1959 struct sock *sk = skb->sk;
1961 if (sk && !skb_shinfo(skb)->tx_flags) {
1962 /* skb_tx_hash() wont be able to get sk.
1963 * We copy sk_hash into skb->rxhash
1966 skb->rxhash = sk->sk_hash;
1971 int netif_get_vlan_features(struct sk_buff *skb, struct net_device *dev)
1973 __be16 protocol = skb->protocol;
1975 if (protocol == htons(ETH_P_8021Q)) {
1976 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1977 protocol = veh->h_vlan_encapsulated_proto;
1978 } else if (!skb->vlan_tci)
1979 return dev->features;
1981 if (protocol != htons(ETH_P_8021Q))
1982 return dev->features & dev->vlan_features;
1986 EXPORT_SYMBOL(netif_get_vlan_features);
1989 * Returns true if either:
1990 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
1991 * 2. skb is fragmented and the device does not support SG, or if
1992 * at least one of fragments is in highmem and device does not
1993 * support DMA from it.
1995 static inline int skb_needs_linearize(struct sk_buff *skb,
1996 struct net_device *dev)
1998 if (skb_is_nonlinear(skb)) {
1999 int features = dev->features;
2001 if (vlan_tx_tag_present(skb))
2002 features &= dev->vlan_features;
2004 return (skb_has_frag_list(skb) &&
2005 !(features & NETIF_F_FRAGLIST)) ||
2006 (skb_shinfo(skb)->nr_frags &&
2007 (!(features & NETIF_F_SG) ||
2008 illegal_highdma(dev, skb)));
2014 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2015 struct netdev_queue *txq)
2017 const struct net_device_ops *ops = dev->netdev_ops;
2018 int rc = NETDEV_TX_OK;
2020 if (likely(!skb->next)) {
2021 if (!list_empty(&ptype_all))
2022 dev_queue_xmit_nit(skb, dev);
2025 * If device doesnt need skb->dst, release it right now while
2026 * its hot in this cpu cache
2028 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2031 skb_orphan_try(skb);
2033 if (vlan_tx_tag_present(skb) &&
2034 !(dev->features & NETIF_F_HW_VLAN_TX)) {
2035 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2042 if (netif_needs_gso(dev, skb)) {
2043 if (unlikely(dev_gso_segment(skb)))
2048 if (skb_needs_linearize(skb, dev) &&
2049 __skb_linearize(skb))
2052 /* If packet is not checksummed and device does not
2053 * support checksumming for this protocol, complete
2054 * checksumming here.
2056 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2057 skb_set_transport_header(skb, skb->csum_start -
2059 if (!dev_can_checksum(dev, skb) &&
2060 skb_checksum_help(skb))
2065 rc = ops->ndo_start_xmit(skb, dev);
2066 trace_net_dev_xmit(skb, rc);
2067 if (rc == NETDEV_TX_OK)
2068 txq_trans_update(txq);
2074 struct sk_buff *nskb = skb->next;
2076 skb->next = nskb->next;
2080 * If device doesnt need nskb->dst, release it right now while
2081 * its hot in this cpu cache
2083 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2086 rc = ops->ndo_start_xmit(nskb, dev);
2087 trace_net_dev_xmit(nskb, rc);
2088 if (unlikely(rc != NETDEV_TX_OK)) {
2089 if (rc & ~NETDEV_TX_MASK)
2090 goto out_kfree_gso_skb;
2091 nskb->next = skb->next;
2095 txq_trans_update(txq);
2096 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2097 return NETDEV_TX_BUSY;
2098 } while (skb->next);
2101 if (likely(skb->next == NULL))
2102 skb->destructor = DEV_GSO_CB(skb)->destructor;
2109 static u32 hashrnd __read_mostly;
2111 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
2115 if (skb_rx_queue_recorded(skb)) {
2116 hash = skb_get_rx_queue(skb);
2117 while (unlikely(hash >= dev->real_num_tx_queues))
2118 hash -= dev->real_num_tx_queues;
2122 if (skb->sk && skb->sk->sk_hash)
2123 hash = skb->sk->sk_hash;
2125 hash = (__force u16) skb->protocol ^ skb->rxhash;
2126 hash = jhash_1word(hash, hashrnd);
2128 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
2130 EXPORT_SYMBOL(skb_tx_hash);
2132 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2134 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2135 if (net_ratelimit()) {
2136 pr_warning("%s selects TX queue %d, but "
2137 "real number of TX queues is %d\n",
2138 dev->name, queue_index, dev->real_num_tx_queues);
2145 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2146 struct sk_buff *skb)
2149 const struct net_device_ops *ops = dev->netdev_ops;
2151 if (dev->real_num_tx_queues == 1)
2153 else if (ops->ndo_select_queue) {
2154 queue_index = ops->ndo_select_queue(dev, skb);
2155 queue_index = dev_cap_txqueue(dev, queue_index);
2157 struct sock *sk = skb->sk;
2158 queue_index = sk_tx_queue_get(sk);
2160 if (queue_index < 0 || skb->ooo_okay ||
2161 queue_index >= dev->real_num_tx_queues) {
2162 int old_index = queue_index;
2164 queue_index = skb_tx_hash(dev, skb);
2166 if (queue_index != old_index && sk) {
2167 struct dst_entry *dst =
2168 rcu_dereference_check(sk->sk_dst_cache, 1);
2170 if (dst && skb_dst(skb) == dst)
2171 sk_tx_queue_set(sk, queue_index);
2176 skb_set_queue_mapping(skb, queue_index);
2177 return netdev_get_tx_queue(dev, queue_index);
2180 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2181 struct net_device *dev,
2182 struct netdev_queue *txq)
2184 spinlock_t *root_lock = qdisc_lock(q);
2185 bool contended = qdisc_is_running(q);
2189 * Heuristic to force contended enqueues to serialize on a
2190 * separate lock before trying to get qdisc main lock.
2191 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2192 * and dequeue packets faster.
2194 if (unlikely(contended))
2195 spin_lock(&q->busylock);
2197 spin_lock(root_lock);
2198 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2201 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2202 qdisc_run_begin(q)) {
2204 * This is a work-conserving queue; there are no old skbs
2205 * waiting to be sent out; and the qdisc is not running -
2206 * xmit the skb directly.
2208 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2210 __qdisc_update_bstats(q, skb->len);
2211 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2212 if (unlikely(contended)) {
2213 spin_unlock(&q->busylock);
2220 rc = NET_XMIT_SUCCESS;
2223 rc = qdisc_enqueue_root(skb, q);
2224 if (qdisc_run_begin(q)) {
2225 if (unlikely(contended)) {
2226 spin_unlock(&q->busylock);
2232 spin_unlock(root_lock);
2233 if (unlikely(contended))
2234 spin_unlock(&q->busylock);
2238 static DEFINE_PER_CPU(int, xmit_recursion);
2239 #define RECURSION_LIMIT 10
2242 * dev_queue_xmit - transmit a buffer
2243 * @skb: buffer to transmit
2245 * Queue a buffer for transmission to a network device. The caller must
2246 * have set the device and priority and built the buffer before calling
2247 * this function. The function can be called from an interrupt.
2249 * A negative errno code is returned on a failure. A success does not
2250 * guarantee the frame will be transmitted as it may be dropped due
2251 * to congestion or traffic shaping.
2253 * -----------------------------------------------------------------------------------
2254 * I notice this method can also return errors from the queue disciplines,
2255 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2258 * Regardless of the return value, the skb is consumed, so it is currently
2259 * difficult to retry a send to this method. (You can bump the ref count
2260 * before sending to hold a reference for retry if you are careful.)
2262 * When calling this method, interrupts MUST be enabled. This is because
2263 * the BH enable code must have IRQs enabled so that it will not deadlock.
2266 int dev_queue_xmit(struct sk_buff *skb)
2268 struct net_device *dev = skb->dev;
2269 struct netdev_queue *txq;
2273 /* Disable soft irqs for various locks below. Also
2274 * stops preemption for RCU.
2278 txq = dev_pick_tx(dev, skb);
2279 q = rcu_dereference_bh(txq->qdisc);
2281 #ifdef CONFIG_NET_CLS_ACT
2282 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2284 trace_net_dev_queue(skb);
2286 rc = __dev_xmit_skb(skb, q, dev, txq);
2290 /* The device has no queue. Common case for software devices:
2291 loopback, all the sorts of tunnels...
2293 Really, it is unlikely that netif_tx_lock protection is necessary
2294 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2296 However, it is possible, that they rely on protection
2299 Check this and shot the lock. It is not prone from deadlocks.
2300 Either shot noqueue qdisc, it is even simpler 8)
2302 if (dev->flags & IFF_UP) {
2303 int cpu = smp_processor_id(); /* ok because BHs are off */
2305 if (txq->xmit_lock_owner != cpu) {
2307 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2308 goto recursion_alert;
2310 HARD_TX_LOCK(dev, txq, cpu);
2312 if (!netif_tx_queue_stopped(txq)) {
2313 __this_cpu_inc(xmit_recursion);
2314 rc = dev_hard_start_xmit(skb, dev, txq);
2315 __this_cpu_dec(xmit_recursion);
2316 if (dev_xmit_complete(rc)) {
2317 HARD_TX_UNLOCK(dev, txq);
2321 HARD_TX_UNLOCK(dev, txq);
2322 if (net_ratelimit())
2323 printk(KERN_CRIT "Virtual device %s asks to "
2324 "queue packet!\n", dev->name);
2326 /* Recursion is detected! It is possible,
2330 if (net_ratelimit())
2331 printk(KERN_CRIT "Dead loop on virtual device "
2332 "%s, fix it urgently!\n", dev->name);
2337 rcu_read_unlock_bh();
2342 rcu_read_unlock_bh();
2345 EXPORT_SYMBOL(dev_queue_xmit);
2348 /*=======================================================================
2350 =======================================================================*/
2352 int netdev_max_backlog __read_mostly = 1000;
2353 int netdev_tstamp_prequeue __read_mostly = 1;
2354 int netdev_budget __read_mostly = 300;
2355 int weight_p __read_mostly = 64; /* old backlog weight */
2357 /* Called with irq disabled */
2358 static inline void ____napi_schedule(struct softnet_data *sd,
2359 struct napi_struct *napi)
2361 list_add_tail(&napi->poll_list, &sd->poll_list);
2362 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2366 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2367 * and src/dst port numbers. Returns a non-zero hash number on success
2370 __u32 __skb_get_rxhash(struct sk_buff *skb)
2372 int nhoff, hash = 0, poff;
2373 struct ipv6hdr *ip6;
2376 u32 addr1, addr2, ihl;
2382 nhoff = skb_network_offset(skb);
2384 switch (skb->protocol) {
2385 case __constant_htons(ETH_P_IP):
2386 if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
2389 ip = (struct iphdr *) (skb->data + nhoff);
2390 if (ip->frag_off & htons(IP_MF | IP_OFFSET))
2393 ip_proto = ip->protocol;
2394 addr1 = (__force u32) ip->saddr;
2395 addr2 = (__force u32) ip->daddr;
2398 case __constant_htons(ETH_P_IPV6):
2399 if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
2402 ip6 = (struct ipv6hdr *) (skb->data + nhoff);
2403 ip_proto = ip6->nexthdr;
2404 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2405 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2413 poff = proto_ports_offset(ip_proto);
2415 nhoff += ihl * 4 + poff;
2416 if (pskb_may_pull(skb, nhoff + 4)) {
2417 ports.v32 = * (__force u32 *) (skb->data + nhoff);
2418 if (ports.v16[1] < ports.v16[0])
2419 swap(ports.v16[0], ports.v16[1]);
2423 /* get a consistent hash (same value on both flow directions) */
2427 hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2434 EXPORT_SYMBOL(__skb_get_rxhash);
2438 /* One global table that all flow-based protocols share. */
2439 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2440 EXPORT_SYMBOL(rps_sock_flow_table);
2443 * get_rps_cpu is called from netif_receive_skb and returns the target
2444 * CPU from the RPS map of the receiving queue for a given skb.
2445 * rcu_read_lock must be held on entry.
2447 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2448 struct rps_dev_flow **rflowp)
2450 struct netdev_rx_queue *rxqueue;
2451 struct rps_map *map;
2452 struct rps_dev_flow_table *flow_table;
2453 struct rps_sock_flow_table *sock_flow_table;
2457 if (skb_rx_queue_recorded(skb)) {
2458 u16 index = skb_get_rx_queue(skb);
2459 if (unlikely(index >= dev->real_num_rx_queues)) {
2460 WARN_ONCE(dev->real_num_rx_queues > 1,
2461 "%s received packet on queue %u, but number "
2462 "of RX queues is %u\n",
2463 dev->name, index, dev->real_num_rx_queues);
2466 rxqueue = dev->_rx + index;
2470 map = rcu_dereference(rxqueue->rps_map);
2472 if (map->len == 1) {
2473 tcpu = map->cpus[0];
2474 if (cpu_online(tcpu))
2478 } else if (!rcu_dereference_raw(rxqueue->rps_flow_table)) {
2482 skb_reset_network_header(skb);
2483 if (!skb_get_rxhash(skb))
2486 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2487 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2488 if (flow_table && sock_flow_table) {
2490 struct rps_dev_flow *rflow;
2492 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2495 next_cpu = sock_flow_table->ents[skb->rxhash &
2496 sock_flow_table->mask];
2499 * If the desired CPU (where last recvmsg was done) is
2500 * different from current CPU (one in the rx-queue flow
2501 * table entry), switch if one of the following holds:
2502 * - Current CPU is unset (equal to RPS_NO_CPU).
2503 * - Current CPU is offline.
2504 * - The current CPU's queue tail has advanced beyond the
2505 * last packet that was enqueued using this table entry.
2506 * This guarantees that all previous packets for the flow
2507 * have been dequeued, thus preserving in order delivery.
2509 if (unlikely(tcpu != next_cpu) &&
2510 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2511 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2512 rflow->last_qtail)) >= 0)) {
2513 tcpu = rflow->cpu = next_cpu;
2514 if (tcpu != RPS_NO_CPU)
2515 rflow->last_qtail = per_cpu(softnet_data,
2516 tcpu).input_queue_head;
2518 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2526 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2528 if (cpu_online(tcpu)) {
2538 /* Called from hardirq (IPI) context */
2539 static void rps_trigger_softirq(void *data)
2541 struct softnet_data *sd = data;
2543 ____napi_schedule(sd, &sd->backlog);
2547 #endif /* CONFIG_RPS */
2550 * Check if this softnet_data structure is another cpu one
2551 * If yes, queue it to our IPI list and return 1
2554 static int rps_ipi_queued(struct softnet_data *sd)
2557 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2560 sd->rps_ipi_next = mysd->rps_ipi_list;
2561 mysd->rps_ipi_list = sd;
2563 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2566 #endif /* CONFIG_RPS */
2571 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2572 * queue (may be a remote CPU queue).
2574 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2575 unsigned int *qtail)
2577 struct softnet_data *sd;
2578 unsigned long flags;
2580 sd = &per_cpu(softnet_data, cpu);
2582 local_irq_save(flags);
2585 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2586 if (skb_queue_len(&sd->input_pkt_queue)) {
2588 __skb_queue_tail(&sd->input_pkt_queue, skb);
2589 input_queue_tail_incr_save(sd, qtail);
2591 local_irq_restore(flags);
2592 return NET_RX_SUCCESS;
2595 /* Schedule NAPI for backlog device
2596 * We can use non atomic operation since we own the queue lock
2598 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2599 if (!rps_ipi_queued(sd))
2600 ____napi_schedule(sd, &sd->backlog);
2608 local_irq_restore(flags);
2610 atomic_long_inc(&skb->dev->rx_dropped);
2616 * netif_rx - post buffer to the network code
2617 * @skb: buffer to post
2619 * This function receives a packet from a device driver and queues it for
2620 * the upper (protocol) levels to process. It always succeeds. The buffer
2621 * may be dropped during processing for congestion control or by the
2625 * NET_RX_SUCCESS (no congestion)
2626 * NET_RX_DROP (packet was dropped)
2630 int netif_rx(struct sk_buff *skb)
2634 /* if netpoll wants it, pretend we never saw it */
2635 if (netpoll_rx(skb))
2638 if (netdev_tstamp_prequeue)
2639 net_timestamp_check(skb);
2641 trace_netif_rx(skb);
2644 struct rps_dev_flow voidflow, *rflow = &voidflow;
2650 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2652 cpu = smp_processor_id();
2654 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2662 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2668 EXPORT_SYMBOL(netif_rx);
2670 int netif_rx_ni(struct sk_buff *skb)
2675 err = netif_rx(skb);
2676 if (local_softirq_pending())
2682 EXPORT_SYMBOL(netif_rx_ni);
2684 static void net_tx_action(struct softirq_action *h)
2686 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2688 if (sd->completion_queue) {
2689 struct sk_buff *clist;
2691 local_irq_disable();
2692 clist = sd->completion_queue;
2693 sd->completion_queue = NULL;
2697 struct sk_buff *skb = clist;
2698 clist = clist->next;
2700 WARN_ON(atomic_read(&skb->users));
2701 trace_kfree_skb(skb, net_tx_action);
2706 if (sd->output_queue) {
2709 local_irq_disable();
2710 head = sd->output_queue;
2711 sd->output_queue = NULL;
2712 sd->output_queue_tailp = &sd->output_queue;
2716 struct Qdisc *q = head;
2717 spinlock_t *root_lock;
2719 head = head->next_sched;
2721 root_lock = qdisc_lock(q);
2722 if (spin_trylock(root_lock)) {
2723 smp_mb__before_clear_bit();
2724 clear_bit(__QDISC_STATE_SCHED,
2727 spin_unlock(root_lock);
2729 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2731 __netif_reschedule(q);
2733 smp_mb__before_clear_bit();
2734 clear_bit(__QDISC_STATE_SCHED,
2742 static inline int deliver_skb(struct sk_buff *skb,
2743 struct packet_type *pt_prev,
2744 struct net_device *orig_dev)
2746 atomic_inc(&skb->users);
2747 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2750 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
2751 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
2752 /* This hook is defined here for ATM LANE */
2753 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2754 unsigned char *addr) __read_mostly;
2755 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2758 #ifdef CONFIG_NET_CLS_ACT
2759 /* TODO: Maybe we should just force sch_ingress to be compiled in
2760 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2761 * a compare and 2 stores extra right now if we dont have it on
2762 * but have CONFIG_NET_CLS_ACT
2763 * NOTE: This doesnt stop any functionality; if you dont have
2764 * the ingress scheduler, you just cant add policies on ingress.
2767 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
2769 struct net_device *dev = skb->dev;
2770 u32 ttl = G_TC_RTTL(skb->tc_verd);
2771 int result = TC_ACT_OK;
2774 if (unlikely(MAX_RED_LOOP < ttl++)) {
2775 if (net_ratelimit())
2776 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
2777 skb->skb_iif, dev->ifindex);
2781 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2782 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2785 if (q != &noop_qdisc) {
2786 spin_lock(qdisc_lock(q));
2787 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2788 result = qdisc_enqueue_root(skb, q);
2789 spin_unlock(qdisc_lock(q));
2795 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2796 struct packet_type **pt_prev,
2797 int *ret, struct net_device *orig_dev)
2799 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
2801 if (!rxq || rxq->qdisc == &noop_qdisc)
2805 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2809 switch (ing_filter(skb, rxq)) {
2823 * netdev_rx_handler_register - register receive handler
2824 * @dev: device to register a handler for
2825 * @rx_handler: receive handler to register
2826 * @rx_handler_data: data pointer that is used by rx handler
2828 * Register a receive hander for a device. This handler will then be
2829 * called from __netif_receive_skb. A negative errno code is returned
2832 * The caller must hold the rtnl_mutex.
2834 int netdev_rx_handler_register(struct net_device *dev,
2835 rx_handler_func_t *rx_handler,
2836 void *rx_handler_data)
2840 if (dev->rx_handler)
2843 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
2844 rcu_assign_pointer(dev->rx_handler, rx_handler);
2848 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
2851 * netdev_rx_handler_unregister - unregister receive handler
2852 * @dev: device to unregister a handler from
2854 * Unregister a receive hander from a device.
2856 * The caller must hold the rtnl_mutex.
2858 void netdev_rx_handler_unregister(struct net_device *dev)
2862 rcu_assign_pointer(dev->rx_handler, NULL);
2863 rcu_assign_pointer(dev->rx_handler_data, NULL);
2865 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
2867 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2868 struct net_device *master)
2870 if (skb->pkt_type == PACKET_HOST) {
2871 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2873 memcpy(dest, master->dev_addr, ETH_ALEN);
2877 /* On bonding slaves other than the currently active slave, suppress
2878 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2879 * ARP on active-backup slaves with arp_validate enabled.
2881 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2883 struct net_device *dev = skb->dev;
2885 if (master->priv_flags & IFF_MASTER_ARPMON)
2886 dev->last_rx = jiffies;
2888 if ((master->priv_flags & IFF_MASTER_ALB) &&
2889 (master->priv_flags & IFF_BRIDGE_PORT)) {
2890 /* Do address unmangle. The local destination address
2891 * will be always the one master has. Provides the right
2892 * functionality in a bridge.
2894 skb_bond_set_mac_by_master(skb, master);
2897 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2898 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2899 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2902 if (master->priv_flags & IFF_MASTER_ALB) {
2903 if (skb->pkt_type != PACKET_BROADCAST &&
2904 skb->pkt_type != PACKET_MULTICAST)
2907 if (master->priv_flags & IFF_MASTER_8023AD &&
2908 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2915 EXPORT_SYMBOL(__skb_bond_should_drop);
2917 static int __netif_receive_skb(struct sk_buff *skb)
2919 struct packet_type *ptype, *pt_prev;
2920 rx_handler_func_t *rx_handler;
2921 struct net_device *orig_dev;
2922 struct net_device *master;
2923 struct net_device *null_or_orig;
2924 struct net_device *orig_or_bond;
2925 int ret = NET_RX_DROP;
2928 if (!netdev_tstamp_prequeue)
2929 net_timestamp_check(skb);
2931 trace_netif_receive_skb(skb);
2933 /* if we've gotten here through NAPI, check netpoll */
2934 if (netpoll_receive_skb(skb))
2938 skb->skb_iif = skb->dev->ifindex;
2941 * bonding note: skbs received on inactive slaves should only
2942 * be delivered to pkt handlers that are exact matches. Also
2943 * the deliver_no_wcard flag will be set. If packet handlers
2944 * are sensitive to duplicate packets these skbs will need to
2945 * be dropped at the handler.
2947 null_or_orig = NULL;
2948 orig_dev = skb->dev;
2949 master = ACCESS_ONCE(orig_dev->master);
2950 if (skb->deliver_no_wcard)
2951 null_or_orig = orig_dev;
2953 if (skb_bond_should_drop(skb, master)) {
2954 skb->deliver_no_wcard = 1;
2955 null_or_orig = orig_dev; /* deliver only exact match */
2960 __this_cpu_inc(softnet_data.processed);
2961 skb_reset_network_header(skb);
2962 skb_reset_transport_header(skb);
2963 skb->mac_len = skb->network_header - skb->mac_header;
2969 #ifdef CONFIG_NET_CLS_ACT
2970 if (skb->tc_verd & TC_NCLS) {
2971 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2976 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2977 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2978 ptype->dev == orig_dev) {
2980 ret = deliver_skb(skb, pt_prev, orig_dev);
2985 #ifdef CONFIG_NET_CLS_ACT
2986 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2992 /* Handle special case of bridge or macvlan */
2993 rx_handler = rcu_dereference(skb->dev->rx_handler);
2996 ret = deliver_skb(skb, pt_prev, orig_dev);
2999 skb = rx_handler(skb);
3004 if (vlan_tx_tag_present(skb)) {
3006 ret = deliver_skb(skb, pt_prev, orig_dev);
3009 if (vlan_hwaccel_do_receive(&skb)) {
3010 ret = __netif_receive_skb(skb);
3012 } else if (unlikely(!skb))
3017 * Make sure frames received on VLAN interfaces stacked on
3018 * bonding interfaces still make their way to any base bonding
3019 * device that may have registered for a specific ptype. The
3020 * handler may have to adjust skb->dev and orig_dev.
3022 orig_or_bond = orig_dev;
3023 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
3024 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
3025 orig_or_bond = vlan_dev_real_dev(skb->dev);
3028 type = skb->protocol;
3029 list_for_each_entry_rcu(ptype,
3030 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3031 if (ptype->type == type && (ptype->dev == null_or_orig ||
3032 ptype->dev == skb->dev || ptype->dev == orig_dev ||
3033 ptype->dev == orig_or_bond)) {
3035 ret = deliver_skb(skb, pt_prev, orig_dev);
3041 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3043 atomic_long_inc(&skb->dev->rx_dropped);
3045 /* Jamal, now you will not able to escape explaining
3046 * me how you were going to use this. :-)
3057 * netif_receive_skb - process receive buffer from network
3058 * @skb: buffer to process
3060 * netif_receive_skb() is the main receive data processing function.
3061 * It always succeeds. The buffer may be dropped during processing
3062 * for congestion control or by the protocol layers.
3064 * This function may only be called from softirq context and interrupts
3065 * should be enabled.
3067 * Return values (usually ignored):
3068 * NET_RX_SUCCESS: no congestion
3069 * NET_RX_DROP: packet was dropped
3071 int netif_receive_skb(struct sk_buff *skb)
3073 if (netdev_tstamp_prequeue)
3074 net_timestamp_check(skb);
3076 if (skb_defer_rx_timestamp(skb))
3077 return NET_RX_SUCCESS;
3081 struct rps_dev_flow voidflow, *rflow = &voidflow;
3086 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3089 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3093 ret = __netif_receive_skb(skb);
3099 return __netif_receive_skb(skb);
3102 EXPORT_SYMBOL(netif_receive_skb);
3104 /* Network device is going away, flush any packets still pending
3105 * Called with irqs disabled.
3107 static void flush_backlog(void *arg)
3109 struct net_device *dev = arg;
3110 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3111 struct sk_buff *skb, *tmp;
3114 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3115 if (skb->dev == dev) {
3116 __skb_unlink(skb, &sd->input_pkt_queue);
3118 input_queue_head_incr(sd);
3123 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3124 if (skb->dev == dev) {
3125 __skb_unlink(skb, &sd->process_queue);
3127 input_queue_head_incr(sd);
3132 static int napi_gro_complete(struct sk_buff *skb)
3134 struct packet_type *ptype;
3135 __be16 type = skb->protocol;
3136 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3139 if (NAPI_GRO_CB(skb)->count == 1) {
3140 skb_shinfo(skb)->gso_size = 0;
3145 list_for_each_entry_rcu(ptype, head, list) {
3146 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3149 err = ptype->gro_complete(skb);
3155 WARN_ON(&ptype->list == head);
3157 return NET_RX_SUCCESS;
3161 return netif_receive_skb(skb);
3164 inline void napi_gro_flush(struct napi_struct *napi)
3166 struct sk_buff *skb, *next;
3168 for (skb = napi->gro_list; skb; skb = next) {
3171 napi_gro_complete(skb);
3174 napi->gro_count = 0;
3175 napi->gro_list = NULL;
3177 EXPORT_SYMBOL(napi_gro_flush);
3179 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3181 struct sk_buff **pp = NULL;
3182 struct packet_type *ptype;
3183 __be16 type = skb->protocol;
3184 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3187 enum gro_result ret;
3189 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3192 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3196 list_for_each_entry_rcu(ptype, head, list) {
3197 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3200 skb_set_network_header(skb, skb_gro_offset(skb));
3201 mac_len = skb->network_header - skb->mac_header;
3202 skb->mac_len = mac_len;
3203 NAPI_GRO_CB(skb)->same_flow = 0;
3204 NAPI_GRO_CB(skb)->flush = 0;
3205 NAPI_GRO_CB(skb)->free = 0;
3207 pp = ptype->gro_receive(&napi->gro_list, skb);
3212 if (&ptype->list == head)
3215 same_flow = NAPI_GRO_CB(skb)->same_flow;
3216 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3219 struct sk_buff *nskb = *pp;
3223 napi_gro_complete(nskb);
3230 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3234 NAPI_GRO_CB(skb)->count = 1;
3235 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3236 skb->next = napi->gro_list;
3237 napi->gro_list = skb;
3241 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3242 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3244 BUG_ON(skb->end - skb->tail < grow);
3246 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3249 skb->data_len -= grow;
3251 skb_shinfo(skb)->frags[0].page_offset += grow;
3252 skb_shinfo(skb)->frags[0].size -= grow;
3254 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3255 put_page(skb_shinfo(skb)->frags[0].page);
3256 memmove(skb_shinfo(skb)->frags,
3257 skb_shinfo(skb)->frags + 1,
3258 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3269 EXPORT_SYMBOL(dev_gro_receive);
3271 static inline gro_result_t
3272 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3276 for (p = napi->gro_list; p; p = p->next) {
3277 unsigned long diffs;
3279 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3280 diffs |= p->vlan_tci ^ skb->vlan_tci;
3281 diffs |= compare_ether_header(skb_mac_header(p),
3282 skb_gro_mac_header(skb));
3283 NAPI_GRO_CB(p)->same_flow = !diffs;
3284 NAPI_GRO_CB(p)->flush = 0;
3287 return dev_gro_receive(napi, skb);
3290 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3294 if (netif_receive_skb(skb))
3299 case GRO_MERGED_FREE:
3310 EXPORT_SYMBOL(napi_skb_finish);
3312 void skb_gro_reset_offset(struct sk_buff *skb)
3314 NAPI_GRO_CB(skb)->data_offset = 0;
3315 NAPI_GRO_CB(skb)->frag0 = NULL;
3316 NAPI_GRO_CB(skb)->frag0_len = 0;
3318 if (skb->mac_header == skb->tail &&
3319 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3320 NAPI_GRO_CB(skb)->frag0 =
3321 page_address(skb_shinfo(skb)->frags[0].page) +
3322 skb_shinfo(skb)->frags[0].page_offset;
3323 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3326 EXPORT_SYMBOL(skb_gro_reset_offset);
3328 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3330 skb_gro_reset_offset(skb);
3332 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3334 EXPORT_SYMBOL(napi_gro_receive);
3336 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3338 __skb_pull(skb, skb_headlen(skb));
3339 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3345 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3347 struct sk_buff *skb = napi->skb;
3350 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3356 EXPORT_SYMBOL(napi_get_frags);
3358 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3364 skb->protocol = eth_type_trans(skb, skb->dev);
3366 if (ret == GRO_HELD)
3367 skb_gro_pull(skb, -ETH_HLEN);
3368 else if (netif_receive_skb(skb))
3373 case GRO_MERGED_FREE:
3374 napi_reuse_skb(napi, skb);
3383 EXPORT_SYMBOL(napi_frags_finish);
3385 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3387 struct sk_buff *skb = napi->skb;
3394 skb_reset_mac_header(skb);
3395 skb_gro_reset_offset(skb);
3397 off = skb_gro_offset(skb);
3398 hlen = off + sizeof(*eth);
3399 eth = skb_gro_header_fast(skb, off);
3400 if (skb_gro_header_hard(skb, hlen)) {
3401 eth = skb_gro_header_slow(skb, hlen, off);
3402 if (unlikely(!eth)) {
3403 napi_reuse_skb(napi, skb);
3409 skb_gro_pull(skb, sizeof(*eth));
3412 * This works because the only protocols we care about don't require
3413 * special handling. We'll fix it up properly at the end.
3415 skb->protocol = eth->h_proto;
3420 EXPORT_SYMBOL(napi_frags_skb);
3422 gro_result_t napi_gro_frags(struct napi_struct *napi)
3424 struct sk_buff *skb = napi_frags_skb(napi);
3429 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3431 EXPORT_SYMBOL(napi_gro_frags);
3434 * net_rps_action sends any pending IPI's for rps.
3435 * Note: called with local irq disabled, but exits with local irq enabled.
3437 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3440 struct softnet_data *remsd = sd->rps_ipi_list;
3443 sd->rps_ipi_list = NULL;
3447 /* Send pending IPI's to kick RPS processing on remote cpus. */
3449 struct softnet_data *next = remsd->rps_ipi_next;
3451 if (cpu_online(remsd->cpu))
3452 __smp_call_function_single(remsd->cpu,
3461 static int process_backlog(struct napi_struct *napi, int quota)
3464 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3467 /* Check if we have pending ipi, its better to send them now,
3468 * not waiting net_rx_action() end.
3470 if (sd->rps_ipi_list) {
3471 local_irq_disable();
3472 net_rps_action_and_irq_enable(sd);
3475 napi->weight = weight_p;
3476 local_irq_disable();
3477 while (work < quota) {
3478 struct sk_buff *skb;
3481 while ((skb = __skb_dequeue(&sd->process_queue))) {
3483 __netif_receive_skb(skb);
3484 local_irq_disable();
3485 input_queue_head_incr(sd);
3486 if (++work >= quota) {
3493 qlen = skb_queue_len(&sd->input_pkt_queue);
3495 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3496 &sd->process_queue);
3498 if (qlen < quota - work) {
3500 * Inline a custom version of __napi_complete().
3501 * only current cpu owns and manipulates this napi,
3502 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3503 * we can use a plain write instead of clear_bit(),
3504 * and we dont need an smp_mb() memory barrier.
3506 list_del(&napi->poll_list);
3509 quota = work + qlen;
3519 * __napi_schedule - schedule for receive
3520 * @n: entry to schedule
3522 * The entry's receive function will be scheduled to run
3524 void __napi_schedule(struct napi_struct *n)
3526 unsigned long flags;
3528 local_irq_save(flags);
3529 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3530 local_irq_restore(flags);
3532 EXPORT_SYMBOL(__napi_schedule);
3534 void __napi_complete(struct napi_struct *n)
3536 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3537 BUG_ON(n->gro_list);
3539 list_del(&n->poll_list);
3540 smp_mb__before_clear_bit();
3541 clear_bit(NAPI_STATE_SCHED, &n->state);
3543 EXPORT_SYMBOL(__napi_complete);
3545 void napi_complete(struct napi_struct *n)
3547 unsigned long flags;
3550 * don't let napi dequeue from the cpu poll list
3551 * just in case its running on a different cpu
3553 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3557 local_irq_save(flags);
3559 local_irq_restore(flags);
3561 EXPORT_SYMBOL(napi_complete);
3563 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3564 int (*poll)(struct napi_struct *, int), int weight)
3566 INIT_LIST_HEAD(&napi->poll_list);
3567 napi->gro_count = 0;
3568 napi->gro_list = NULL;
3571 napi->weight = weight;
3572 list_add(&napi->dev_list, &dev->napi_list);
3574 #ifdef CONFIG_NETPOLL
3575 spin_lock_init(&napi->poll_lock);
3576 napi->poll_owner = -1;
3578 set_bit(NAPI_STATE_SCHED, &napi->state);
3580 EXPORT_SYMBOL(netif_napi_add);
3582 void netif_napi_del(struct napi_struct *napi)
3584 struct sk_buff *skb, *next;
3586 list_del_init(&napi->dev_list);
3587 napi_free_frags(napi);
3589 for (skb = napi->gro_list; skb; skb = next) {
3595 napi->gro_list = NULL;
3596 napi->gro_count = 0;
3598 EXPORT_SYMBOL(netif_napi_del);
3600 static void net_rx_action(struct softirq_action *h)
3602 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3603 unsigned long time_limit = jiffies + 2;
3604 int budget = netdev_budget;
3607 local_irq_disable();
3609 while (!list_empty(&sd->poll_list)) {
3610 struct napi_struct *n;
3613 /* If softirq window is exhuasted then punt.
3614 * Allow this to run for 2 jiffies since which will allow
3615 * an average latency of 1.5/HZ.
3617 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3622 /* Even though interrupts have been re-enabled, this
3623 * access is safe because interrupts can only add new
3624 * entries to the tail of this list, and only ->poll()
3625 * calls can remove this head entry from the list.
3627 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3629 have = netpoll_poll_lock(n);
3633 /* This NAPI_STATE_SCHED test is for avoiding a race
3634 * with netpoll's poll_napi(). Only the entity which
3635 * obtains the lock and sees NAPI_STATE_SCHED set will
3636 * actually make the ->poll() call. Therefore we avoid
3637 * accidently calling ->poll() when NAPI is not scheduled.
3640 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3641 work = n->poll(n, weight);
3645 WARN_ON_ONCE(work > weight);
3649 local_irq_disable();
3651 /* Drivers must not modify the NAPI state if they
3652 * consume the entire weight. In such cases this code
3653 * still "owns" the NAPI instance and therefore can
3654 * move the instance around on the list at-will.
3656 if (unlikely(work == weight)) {
3657 if (unlikely(napi_disable_pending(n))) {
3660 local_irq_disable();
3662 list_move_tail(&n->poll_list, &sd->poll_list);
3665 netpoll_poll_unlock(have);
3668 net_rps_action_and_irq_enable(sd);
3670 #ifdef CONFIG_NET_DMA
3672 * There may not be any more sk_buffs coming right now, so push
3673 * any pending DMA copies to hardware
3675 dma_issue_pending_all();
3682 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3686 static gifconf_func_t *gifconf_list[NPROTO];
3689 * register_gifconf - register a SIOCGIF handler
3690 * @family: Address family
3691 * @gifconf: Function handler
3693 * Register protocol dependent address dumping routines. The handler
3694 * that is passed must not be freed or reused until it has been replaced
3695 * by another handler.
3697 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3699 if (family >= NPROTO)
3701 gifconf_list[family] = gifconf;
3704 EXPORT_SYMBOL(register_gifconf);
3708 * Map an interface index to its name (SIOCGIFNAME)
3712 * We need this ioctl for efficient implementation of the
3713 * if_indextoname() function required by the IPv6 API. Without
3714 * it, we would have to search all the interfaces to find a
3718 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3720 struct net_device *dev;
3724 * Fetch the caller's info block.
3727 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3731 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3737 strcpy(ifr.ifr_name, dev->name);
3740 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3746 * Perform a SIOCGIFCONF call. This structure will change
3747 * size eventually, and there is nothing I can do about it.
3748 * Thus we will need a 'compatibility mode'.
3751 static int dev_ifconf(struct net *net, char __user *arg)
3754 struct net_device *dev;
3761 * Fetch the caller's info block.
3764 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3771 * Loop over the interfaces, and write an info block for each.
3775 for_each_netdev(net, dev) {
3776 for (i = 0; i < NPROTO; i++) {
3777 if (gifconf_list[i]) {
3780 done = gifconf_list[i](dev, NULL, 0);
3782 done = gifconf_list[i](dev, pos + total,
3792 * All done. Write the updated control block back to the caller.
3794 ifc.ifc_len = total;
3797 * Both BSD and Solaris return 0 here, so we do too.
3799 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3802 #ifdef CONFIG_PROC_FS
3804 * This is invoked by the /proc filesystem handler to display a device
3807 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3810 struct net *net = seq_file_net(seq);
3812 struct net_device *dev;
3816 return SEQ_START_TOKEN;
3819 for_each_netdev_rcu(net, dev)
3826 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3828 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3829 first_net_device(seq_file_net(seq)) :
3830 next_net_device((struct net_device *)v);
3833 return rcu_dereference(dev);
3836 void dev_seq_stop(struct seq_file *seq, void *v)
3842 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3844 struct rtnl_link_stats64 temp;
3845 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
3847 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
3848 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
3849 dev->name, stats->rx_bytes, stats->rx_packets,
3851 stats->rx_dropped + stats->rx_missed_errors,
3852 stats->rx_fifo_errors,
3853 stats->rx_length_errors + stats->rx_over_errors +
3854 stats->rx_crc_errors + stats->rx_frame_errors,
3855 stats->rx_compressed, stats->multicast,
3856 stats->tx_bytes, stats->tx_packets,
3857 stats->tx_errors, stats->tx_dropped,
3858 stats->tx_fifo_errors, stats->collisions,
3859 stats->tx_carrier_errors +
3860 stats->tx_aborted_errors +
3861 stats->tx_window_errors +
3862 stats->tx_heartbeat_errors,
3863 stats->tx_compressed);
3867 * Called from the PROCfs module. This now uses the new arbitrary sized
3868 * /proc/net interface to create /proc/net/dev
3870 static int dev_seq_show(struct seq_file *seq, void *v)
3872 if (v == SEQ_START_TOKEN)
3873 seq_puts(seq, "Inter-| Receive "
3875 " face |bytes packets errs drop fifo frame "
3876 "compressed multicast|bytes packets errs "
3877 "drop fifo colls carrier compressed\n");
3879 dev_seq_printf_stats(seq, v);
3883 static struct softnet_data *softnet_get_online(loff_t *pos)
3885 struct softnet_data *sd = NULL;
3887 while (*pos < nr_cpu_ids)
3888 if (cpu_online(*pos)) {
3889 sd = &per_cpu(softnet_data, *pos);
3896 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3898 return softnet_get_online(pos);
3901 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3904 return softnet_get_online(pos);
3907 static void softnet_seq_stop(struct seq_file *seq, void *v)
3911 static int softnet_seq_show(struct seq_file *seq, void *v)
3913 struct softnet_data *sd = v;
3915 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3916 sd->processed, sd->dropped, sd->time_squeeze, 0,
3917 0, 0, 0, 0, /* was fastroute */
3918 sd->cpu_collision, sd->received_rps);
3922 static const struct seq_operations dev_seq_ops = {
3923 .start = dev_seq_start,
3924 .next = dev_seq_next,
3925 .stop = dev_seq_stop,
3926 .show = dev_seq_show,
3929 static int dev_seq_open(struct inode *inode, struct file *file)
3931 return seq_open_net(inode, file, &dev_seq_ops,
3932 sizeof(struct seq_net_private));
3935 static const struct file_operations dev_seq_fops = {
3936 .owner = THIS_MODULE,
3937 .open = dev_seq_open,
3939 .llseek = seq_lseek,
3940 .release = seq_release_net,
3943 static const struct seq_operations softnet_seq_ops = {
3944 .start = softnet_seq_start,
3945 .next = softnet_seq_next,
3946 .stop = softnet_seq_stop,
3947 .show = softnet_seq_show,
3950 static int softnet_seq_open(struct inode *inode, struct file *file)
3952 return seq_open(file, &softnet_seq_ops);
3955 static const struct file_operations softnet_seq_fops = {
3956 .owner = THIS_MODULE,
3957 .open = softnet_seq_open,
3959 .llseek = seq_lseek,
3960 .release = seq_release,
3963 static void *ptype_get_idx(loff_t pos)
3965 struct packet_type *pt = NULL;
3969 list_for_each_entry_rcu(pt, &ptype_all, list) {
3975 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3976 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3985 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3989 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3992 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3994 struct packet_type *pt;
3995 struct list_head *nxt;
3999 if (v == SEQ_START_TOKEN)
4000 return ptype_get_idx(0);
4003 nxt = pt->list.next;
4004 if (pt->type == htons(ETH_P_ALL)) {
4005 if (nxt != &ptype_all)
4008 nxt = ptype_base[0].next;
4010 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4012 while (nxt == &ptype_base[hash]) {
4013 if (++hash >= PTYPE_HASH_SIZE)
4015 nxt = ptype_base[hash].next;
4018 return list_entry(nxt, struct packet_type, list);
4021 static void ptype_seq_stop(struct seq_file *seq, void *v)
4027 static int ptype_seq_show(struct seq_file *seq, void *v)
4029 struct packet_type *pt = v;
4031 if (v == SEQ_START_TOKEN)
4032 seq_puts(seq, "Type Device Function\n");
4033 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4034 if (pt->type == htons(ETH_P_ALL))
4035 seq_puts(seq, "ALL ");
4037 seq_printf(seq, "%04x", ntohs(pt->type));
4039 seq_printf(seq, " %-8s %pF\n",
4040 pt->dev ? pt->dev->name : "", pt->func);
4046 static const struct seq_operations ptype_seq_ops = {
4047 .start = ptype_seq_start,
4048 .next = ptype_seq_next,
4049 .stop = ptype_seq_stop,
4050 .show = ptype_seq_show,
4053 static int ptype_seq_open(struct inode *inode, struct file *file)
4055 return seq_open_net(inode, file, &ptype_seq_ops,
4056 sizeof(struct seq_net_private));
4059 static const struct file_operations ptype_seq_fops = {
4060 .owner = THIS_MODULE,
4061 .open = ptype_seq_open,
4063 .llseek = seq_lseek,
4064 .release = seq_release_net,
4068 static int __net_init dev_proc_net_init(struct net *net)
4072 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4074 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4076 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4079 if (wext_proc_init(net))
4085 proc_net_remove(net, "ptype");
4087 proc_net_remove(net, "softnet_stat");
4089 proc_net_remove(net, "dev");
4093 static void __net_exit dev_proc_net_exit(struct net *net)
4095 wext_proc_exit(net);
4097 proc_net_remove(net, "ptype");
4098 proc_net_remove(net, "softnet_stat");
4099 proc_net_remove(net, "dev");
4102 static struct pernet_operations __net_initdata dev_proc_ops = {
4103 .init = dev_proc_net_init,
4104 .exit = dev_proc_net_exit,
4107 static int __init dev_proc_init(void)
4109 return register_pernet_subsys(&dev_proc_ops);
4112 #define dev_proc_init() 0
4113 #endif /* CONFIG_PROC_FS */
4117 * netdev_set_master - set up master/slave pair
4118 * @slave: slave device
4119 * @master: new master device
4121 * Changes the master device of the slave. Pass %NULL to break the
4122 * bonding. The caller must hold the RTNL semaphore. On a failure
4123 * a negative errno code is returned. On success the reference counts
4124 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
4125 * function returns zero.
4127 int netdev_set_master(struct net_device *slave, struct net_device *master)
4129 struct net_device *old = slave->master;
4139 slave->master = master;
4146 slave->flags |= IFF_SLAVE;
4148 slave->flags &= ~IFF_SLAVE;
4150 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4153 EXPORT_SYMBOL(netdev_set_master);
4155 static void dev_change_rx_flags(struct net_device *dev, int flags)
4157 const struct net_device_ops *ops = dev->netdev_ops;
4159 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4160 ops->ndo_change_rx_flags(dev, flags);
4163 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4165 unsigned short old_flags = dev->flags;
4171 dev->flags |= IFF_PROMISC;
4172 dev->promiscuity += inc;
4173 if (dev->promiscuity == 0) {
4176 * If inc causes overflow, untouch promisc and return error.
4179 dev->flags &= ~IFF_PROMISC;
4181 dev->promiscuity -= inc;
4182 printk(KERN_WARNING "%s: promiscuity touches roof, "
4183 "set promiscuity failed, promiscuity feature "
4184 "of device might be broken.\n", dev->name);
4188 if (dev->flags != old_flags) {
4189 printk(KERN_INFO "device %s %s promiscuous mode\n",
4190 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4192 if (audit_enabled) {
4193 current_uid_gid(&uid, &gid);
4194 audit_log(current->audit_context, GFP_ATOMIC,
4195 AUDIT_ANOM_PROMISCUOUS,
4196 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4197 dev->name, (dev->flags & IFF_PROMISC),
4198 (old_flags & IFF_PROMISC),
4199 audit_get_loginuid(current),
4201 audit_get_sessionid(current));
4204 dev_change_rx_flags(dev, IFF_PROMISC);
4210 * dev_set_promiscuity - update promiscuity count on a device
4214 * Add or remove promiscuity from a device. While the count in the device
4215 * remains above zero the interface remains promiscuous. Once it hits zero
4216 * the device reverts back to normal filtering operation. A negative inc
4217 * value is used to drop promiscuity on the device.
4218 * Return 0 if successful or a negative errno code on error.
4220 int dev_set_promiscuity(struct net_device *dev, int inc)
4222 unsigned short old_flags = dev->flags;
4225 err = __dev_set_promiscuity(dev, inc);
4228 if (dev->flags != old_flags)
4229 dev_set_rx_mode(dev);
4232 EXPORT_SYMBOL(dev_set_promiscuity);
4235 * dev_set_allmulti - update allmulti count on a device
4239 * Add or remove reception of all multicast frames to a device. While the
4240 * count in the device remains above zero the interface remains listening
4241 * to all interfaces. Once it hits zero the device reverts back to normal
4242 * filtering operation. A negative @inc value is used to drop the counter
4243 * when releasing a resource needing all multicasts.
4244 * Return 0 if successful or a negative errno code on error.
4247 int dev_set_allmulti(struct net_device *dev, int inc)
4249 unsigned short old_flags = dev->flags;
4253 dev->flags |= IFF_ALLMULTI;
4254 dev->allmulti += inc;
4255 if (dev->allmulti == 0) {
4258 * If inc causes overflow, untouch allmulti and return error.
4261 dev->flags &= ~IFF_ALLMULTI;
4263 dev->allmulti -= inc;
4264 printk(KERN_WARNING "%s: allmulti touches roof, "
4265 "set allmulti failed, allmulti feature of "
4266 "device might be broken.\n", dev->name);
4270 if (dev->flags ^ old_flags) {
4271 dev_change_rx_flags(dev, IFF_ALLMULTI);
4272 dev_set_rx_mode(dev);
4276 EXPORT_SYMBOL(dev_set_allmulti);
4279 * Upload unicast and multicast address lists to device and
4280 * configure RX filtering. When the device doesn't support unicast
4281 * filtering it is put in promiscuous mode while unicast addresses
4284 void __dev_set_rx_mode(struct net_device *dev)
4286 const struct net_device_ops *ops = dev->netdev_ops;
4288 /* dev_open will call this function so the list will stay sane. */
4289 if (!(dev->flags&IFF_UP))
4292 if (!netif_device_present(dev))
4295 if (ops->ndo_set_rx_mode)
4296 ops->ndo_set_rx_mode(dev);
4298 /* Unicast addresses changes may only happen under the rtnl,
4299 * therefore calling __dev_set_promiscuity here is safe.
4301 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4302 __dev_set_promiscuity(dev, 1);
4303 dev->uc_promisc = 1;
4304 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4305 __dev_set_promiscuity(dev, -1);
4306 dev->uc_promisc = 0;
4309 if (ops->ndo_set_multicast_list)
4310 ops->ndo_set_multicast_list(dev);
4314 void dev_set_rx_mode(struct net_device *dev)
4316 netif_addr_lock_bh(dev);
4317 __dev_set_rx_mode(dev);
4318 netif_addr_unlock_bh(dev);
4322 * dev_get_flags - get flags reported to userspace
4325 * Get the combination of flag bits exported through APIs to userspace.
4327 unsigned dev_get_flags(const struct net_device *dev)
4331 flags = (dev->flags & ~(IFF_PROMISC |
4336 (dev->gflags & (IFF_PROMISC |
4339 if (netif_running(dev)) {
4340 if (netif_oper_up(dev))
4341 flags |= IFF_RUNNING;
4342 if (netif_carrier_ok(dev))
4343 flags |= IFF_LOWER_UP;
4344 if (netif_dormant(dev))
4345 flags |= IFF_DORMANT;
4350 EXPORT_SYMBOL(dev_get_flags);
4352 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4354 int old_flags = dev->flags;
4360 * Set the flags on our device.
4363 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4364 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4366 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4370 * Load in the correct multicast list now the flags have changed.
4373 if ((old_flags ^ flags) & IFF_MULTICAST)
4374 dev_change_rx_flags(dev, IFF_MULTICAST);
4376 dev_set_rx_mode(dev);
4379 * Have we downed the interface. We handle IFF_UP ourselves
4380 * according to user attempts to set it, rather than blindly
4385 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4386 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4389 dev_set_rx_mode(dev);
4392 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4393 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4395 dev->gflags ^= IFF_PROMISC;
4396 dev_set_promiscuity(dev, inc);
4399 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4400 is important. Some (broken) drivers set IFF_PROMISC, when
4401 IFF_ALLMULTI is requested not asking us and not reporting.
4403 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4404 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4406 dev->gflags ^= IFF_ALLMULTI;
4407 dev_set_allmulti(dev, inc);
4413 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4415 unsigned int changes = dev->flags ^ old_flags;
4417 if (changes & IFF_UP) {
4418 if (dev->flags & IFF_UP)
4419 call_netdevice_notifiers(NETDEV_UP, dev);
4421 call_netdevice_notifiers(NETDEV_DOWN, dev);
4424 if (dev->flags & IFF_UP &&
4425 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4426 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4430 * dev_change_flags - change device settings
4432 * @flags: device state flags
4434 * Change settings on device based state flags. The flags are
4435 * in the userspace exported format.
4437 int dev_change_flags(struct net_device *dev, unsigned flags)
4440 int old_flags = dev->flags;
4442 ret = __dev_change_flags(dev, flags);
4446 changes = old_flags ^ dev->flags;
4448 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4450 __dev_notify_flags(dev, old_flags);
4453 EXPORT_SYMBOL(dev_change_flags);
4456 * dev_set_mtu - Change maximum transfer unit
4458 * @new_mtu: new transfer unit
4460 * Change the maximum transfer size of the network device.
4462 int dev_set_mtu(struct net_device *dev, int new_mtu)
4464 const struct net_device_ops *ops = dev->netdev_ops;
4467 if (new_mtu == dev->mtu)
4470 /* MTU must be positive. */
4474 if (!netif_device_present(dev))
4478 if (ops->ndo_change_mtu)
4479 err = ops->ndo_change_mtu(dev, new_mtu);
4483 if (!err && dev->flags & IFF_UP)
4484 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4487 EXPORT_SYMBOL(dev_set_mtu);
4490 * dev_set_mac_address - Change Media Access Control Address
4494 * Change the hardware (MAC) address of the device
4496 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4498 const struct net_device_ops *ops = dev->netdev_ops;
4501 if (!ops->ndo_set_mac_address)
4503 if (sa->sa_family != dev->type)
4505 if (!netif_device_present(dev))
4507 err = ops->ndo_set_mac_address(dev, sa);
4509 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4512 EXPORT_SYMBOL(dev_set_mac_address);
4515 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4517 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4520 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4526 case SIOCGIFFLAGS: /* Get interface flags */
4527 ifr->ifr_flags = (short) dev_get_flags(dev);
4530 case SIOCGIFMETRIC: /* Get the metric on the interface
4531 (currently unused) */
4532 ifr->ifr_metric = 0;
4535 case SIOCGIFMTU: /* Get the MTU of a device */
4536 ifr->ifr_mtu = dev->mtu;
4541 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4543 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4544 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4545 ifr->ifr_hwaddr.sa_family = dev->type;
4553 ifr->ifr_map.mem_start = dev->mem_start;
4554 ifr->ifr_map.mem_end = dev->mem_end;
4555 ifr->ifr_map.base_addr = dev->base_addr;
4556 ifr->ifr_map.irq = dev->irq;
4557 ifr->ifr_map.dma = dev->dma;
4558 ifr->ifr_map.port = dev->if_port;
4562 ifr->ifr_ifindex = dev->ifindex;
4566 ifr->ifr_qlen = dev->tx_queue_len;
4570 /* dev_ioctl() should ensure this case
4582 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4584 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4587 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4588 const struct net_device_ops *ops;
4593 ops = dev->netdev_ops;
4596 case SIOCSIFFLAGS: /* Set interface flags */
4597 return dev_change_flags(dev, ifr->ifr_flags);
4599 case SIOCSIFMETRIC: /* Set the metric on the interface
4600 (currently unused) */
4603 case SIOCSIFMTU: /* Set the MTU of a device */
4604 return dev_set_mtu(dev, ifr->ifr_mtu);
4607 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4609 case SIOCSIFHWBROADCAST:
4610 if (ifr->ifr_hwaddr.sa_family != dev->type)
4612 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4613 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4614 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4618 if (ops->ndo_set_config) {
4619 if (!netif_device_present(dev))
4621 return ops->ndo_set_config(dev, &ifr->ifr_map);
4626 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4627 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4629 if (!netif_device_present(dev))
4631 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4634 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4635 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4637 if (!netif_device_present(dev))
4639 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4642 if (ifr->ifr_qlen < 0)
4644 dev->tx_queue_len = ifr->ifr_qlen;
4648 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4649 return dev_change_name(dev, ifr->ifr_newname);
4652 * Unknown or private ioctl
4655 if ((cmd >= SIOCDEVPRIVATE &&
4656 cmd <= SIOCDEVPRIVATE + 15) ||
4657 cmd == SIOCBONDENSLAVE ||
4658 cmd == SIOCBONDRELEASE ||
4659 cmd == SIOCBONDSETHWADDR ||
4660 cmd == SIOCBONDSLAVEINFOQUERY ||
4661 cmd == SIOCBONDINFOQUERY ||
4662 cmd == SIOCBONDCHANGEACTIVE ||
4663 cmd == SIOCGMIIPHY ||
4664 cmd == SIOCGMIIREG ||
4665 cmd == SIOCSMIIREG ||
4666 cmd == SIOCBRADDIF ||
4667 cmd == SIOCBRDELIF ||
4668 cmd == SIOCSHWTSTAMP ||
4669 cmd == SIOCWANDEV) {
4671 if (ops->ndo_do_ioctl) {
4672 if (netif_device_present(dev))
4673 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4685 * This function handles all "interface"-type I/O control requests. The actual
4686 * 'doing' part of this is dev_ifsioc above.
4690 * dev_ioctl - network device ioctl
4691 * @net: the applicable net namespace
4692 * @cmd: command to issue
4693 * @arg: pointer to a struct ifreq in user space
4695 * Issue ioctl functions to devices. This is normally called by the
4696 * user space syscall interfaces but can sometimes be useful for
4697 * other purposes. The return value is the return from the syscall if
4698 * positive or a negative errno code on error.
4701 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4707 /* One special case: SIOCGIFCONF takes ifconf argument
4708 and requires shared lock, because it sleeps writing
4712 if (cmd == SIOCGIFCONF) {
4714 ret = dev_ifconf(net, (char __user *) arg);
4718 if (cmd == SIOCGIFNAME)
4719 return dev_ifname(net, (struct ifreq __user *)arg);
4721 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4724 ifr.ifr_name[IFNAMSIZ-1] = 0;
4726 colon = strchr(ifr.ifr_name, ':');
4731 * See which interface the caller is talking about.
4736 * These ioctl calls:
4737 * - can be done by all.
4738 * - atomic and do not require locking.
4749 dev_load(net, ifr.ifr_name);
4751 ret = dev_ifsioc_locked(net, &ifr, cmd);
4756 if (copy_to_user(arg, &ifr,
4757 sizeof(struct ifreq)))
4763 dev_load(net, ifr.ifr_name);
4765 ret = dev_ethtool(net, &ifr);
4770 if (copy_to_user(arg, &ifr,
4771 sizeof(struct ifreq)))
4777 * These ioctl calls:
4778 * - require superuser power.
4779 * - require strict serialization.
4785 if (!capable(CAP_NET_ADMIN))
4787 dev_load(net, ifr.ifr_name);
4789 ret = dev_ifsioc(net, &ifr, cmd);
4794 if (copy_to_user(arg, &ifr,
4795 sizeof(struct ifreq)))
4801 * These ioctl calls:
4802 * - require superuser power.
4803 * - require strict serialization.
4804 * - do not return a value
4814 case SIOCSIFHWBROADCAST:
4817 case SIOCBONDENSLAVE:
4818 case SIOCBONDRELEASE:
4819 case SIOCBONDSETHWADDR:
4820 case SIOCBONDCHANGEACTIVE:
4824 if (!capable(CAP_NET_ADMIN))
4827 case SIOCBONDSLAVEINFOQUERY:
4828 case SIOCBONDINFOQUERY:
4829 dev_load(net, ifr.ifr_name);
4831 ret = dev_ifsioc(net, &ifr, cmd);
4836 /* Get the per device memory space. We can add this but
4837 * currently do not support it */
4839 /* Set the per device memory buffer space.
4840 * Not applicable in our case */
4845 * Unknown or private ioctl.
4848 if (cmd == SIOCWANDEV ||
4849 (cmd >= SIOCDEVPRIVATE &&
4850 cmd <= SIOCDEVPRIVATE + 15)) {
4851 dev_load(net, ifr.ifr_name);
4853 ret = dev_ifsioc(net, &ifr, cmd);
4855 if (!ret && copy_to_user(arg, &ifr,
4856 sizeof(struct ifreq)))
4860 /* Take care of Wireless Extensions */
4861 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4862 return wext_handle_ioctl(net, &ifr, cmd, arg);
4869 * dev_new_index - allocate an ifindex
4870 * @net: the applicable net namespace
4872 * Returns a suitable unique value for a new device interface
4873 * number. The caller must hold the rtnl semaphore or the
4874 * dev_base_lock to be sure it remains unique.
4876 static int dev_new_index(struct net *net)
4882 if (!__dev_get_by_index(net, ifindex))
4887 /* Delayed registration/unregisteration */
4888 static LIST_HEAD(net_todo_list);
4890 static void net_set_todo(struct net_device *dev)
4892 list_add_tail(&dev->todo_list, &net_todo_list);
4895 static void rollback_registered_many(struct list_head *head)
4897 struct net_device *dev, *tmp;
4899 BUG_ON(dev_boot_phase);
4902 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4903 /* Some devices call without registering
4904 * for initialization unwind. Remove those
4905 * devices and proceed with the remaining.
4907 if (dev->reg_state == NETREG_UNINITIALIZED) {
4908 pr_debug("unregister_netdevice: device %s/%p never "
4909 "was registered\n", dev->name, dev);
4912 list_del(&dev->unreg_list);
4916 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4918 /* If device is running, close it first. */
4921 /* And unlink it from device chain. */
4922 unlist_netdevice(dev);
4924 dev->reg_state = NETREG_UNREGISTERING;
4929 list_for_each_entry(dev, head, unreg_list) {
4930 /* Shutdown queueing discipline. */
4934 /* Notify protocols, that we are about to destroy
4935 this device. They should clean all the things.
4937 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4939 if (!dev->rtnl_link_ops ||
4940 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4941 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4944 * Flush the unicast and multicast chains
4949 if (dev->netdev_ops->ndo_uninit)
4950 dev->netdev_ops->ndo_uninit(dev);
4952 /* Notifier chain MUST detach us from master device. */
4953 WARN_ON(dev->master);
4955 /* Remove entries from kobject tree */
4956 netdev_unregister_kobject(dev);
4959 /* Process any work delayed until the end of the batch */
4960 dev = list_first_entry(head, struct net_device, unreg_list);
4961 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4965 list_for_each_entry(dev, head, unreg_list)
4969 static void rollback_registered(struct net_device *dev)
4973 list_add(&dev->unreg_list, &single);
4974 rollback_registered_many(&single);
4977 unsigned long netdev_fix_features(unsigned long features, const char *name)
4979 /* Fix illegal SG+CSUM combinations. */
4980 if ((features & NETIF_F_SG) &&
4981 !(features & NETIF_F_ALL_CSUM)) {
4983 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4984 "checksum feature.\n", name);
4985 features &= ~NETIF_F_SG;
4988 /* TSO requires that SG is present as well. */
4989 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4991 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4992 "SG feature.\n", name);
4993 features &= ~NETIF_F_TSO;
4996 if (features & NETIF_F_UFO) {
4997 if (!(features & NETIF_F_GEN_CSUM)) {
4999 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
5000 "since no NETIF_F_HW_CSUM feature.\n",
5002 features &= ~NETIF_F_UFO;
5005 if (!(features & NETIF_F_SG)) {
5007 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
5008 "since no NETIF_F_SG feature.\n", name);
5009 features &= ~NETIF_F_UFO;
5015 EXPORT_SYMBOL(netdev_fix_features);
5018 * netif_stacked_transfer_operstate - transfer operstate
5019 * @rootdev: the root or lower level device to transfer state from
5020 * @dev: the device to transfer operstate to
5022 * Transfer operational state from root to device. This is normally
5023 * called when a stacking relationship exists between the root
5024 * device and the device(a leaf device).
5026 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5027 struct net_device *dev)
5029 if (rootdev->operstate == IF_OPER_DORMANT)
5030 netif_dormant_on(dev);
5032 netif_dormant_off(dev);
5034 if (netif_carrier_ok(rootdev)) {
5035 if (!netif_carrier_ok(dev))
5036 netif_carrier_on(dev);
5038 if (netif_carrier_ok(dev))
5039 netif_carrier_off(dev);
5042 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5044 static int netif_alloc_rx_queues(struct net_device *dev)
5047 unsigned int i, count = dev->num_rx_queues;
5048 struct netdev_rx_queue *rx;
5052 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5054 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5059 for (i = 0; i < count; i++)
5065 static int netif_alloc_netdev_queues(struct net_device *dev)
5067 unsigned int count = dev->num_tx_queues;
5068 struct netdev_queue *tx;
5072 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5074 pr_err("netdev: Unable to allocate %u tx queues.\n",
5082 static void netdev_init_one_queue(struct net_device *dev,
5083 struct netdev_queue *queue,
5088 /* Initialize queue lock */
5089 spin_lock_init(&queue->_xmit_lock);
5090 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5091 queue->xmit_lock_owner = -1;
5094 static void netdev_init_queues(struct net_device *dev)
5096 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5097 spin_lock_init(&dev->tx_global_lock);
5101 * register_netdevice - register a network device
5102 * @dev: device to register
5104 * Take a completed network device structure and add it to the kernel
5105 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5106 * chain. 0 is returned on success. A negative errno code is returned
5107 * on a failure to set up the device, or if the name is a duplicate.
5109 * Callers must hold the rtnl semaphore. You may want
5110 * register_netdev() instead of this.
5113 * The locking appears insufficient to guarantee two parallel registers
5114 * will not get the same name.
5117 int register_netdevice(struct net_device *dev)
5120 struct net *net = dev_net(dev);
5122 BUG_ON(dev_boot_phase);
5127 /* When net_device's are persistent, this will be fatal. */
5128 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5131 spin_lock_init(&dev->addr_list_lock);
5132 netdev_set_addr_lockdep_class(dev);
5136 netdev_init_queues(dev);
5138 /* Init, if this function is available */
5139 if (dev->netdev_ops->ndo_init) {
5140 ret = dev->netdev_ops->ndo_init(dev);
5148 ret = dev_get_valid_name(dev, dev->name, 0);
5152 dev->ifindex = dev_new_index(net);
5153 if (dev->iflink == -1)
5154 dev->iflink = dev->ifindex;
5156 /* Fix illegal checksum combinations */
5157 if ((dev->features & NETIF_F_HW_CSUM) &&
5158 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5159 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
5161 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5164 if ((dev->features & NETIF_F_NO_CSUM) &&
5165 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5166 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
5168 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5171 dev->features = netdev_fix_features(dev->features, dev->name);
5173 /* Enable software GSO if SG is supported. */
5174 if (dev->features & NETIF_F_SG)
5175 dev->features |= NETIF_F_GSO;
5177 /* Enable GRO and NETIF_F_HIGHDMA for vlans by default,
5178 * vlan_dev_init() will do the dev->features check, so these features
5179 * are enabled only if supported by underlying device.
5181 dev->vlan_features |= (NETIF_F_GRO | NETIF_F_HIGHDMA);
5183 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5184 ret = notifier_to_errno(ret);
5188 ret = netdev_register_kobject(dev);
5191 dev->reg_state = NETREG_REGISTERED;
5194 * Default initial state at registry is that the
5195 * device is present.
5198 set_bit(__LINK_STATE_PRESENT, &dev->state);
5200 dev_init_scheduler(dev);
5202 list_netdevice(dev);
5204 /* Notify protocols, that a new device appeared. */
5205 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5206 ret = notifier_to_errno(ret);
5208 rollback_registered(dev);
5209 dev->reg_state = NETREG_UNREGISTERED;
5212 * Prevent userspace races by waiting until the network
5213 * device is fully setup before sending notifications.
5215 if (!dev->rtnl_link_ops ||
5216 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5217 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5223 if (dev->netdev_ops->ndo_uninit)
5224 dev->netdev_ops->ndo_uninit(dev);
5227 EXPORT_SYMBOL(register_netdevice);
5230 * init_dummy_netdev - init a dummy network device for NAPI
5231 * @dev: device to init
5233 * This takes a network device structure and initialize the minimum
5234 * amount of fields so it can be used to schedule NAPI polls without
5235 * registering a full blown interface. This is to be used by drivers
5236 * that need to tie several hardware interfaces to a single NAPI
5237 * poll scheduler due to HW limitations.
5239 int init_dummy_netdev(struct net_device *dev)
5241 /* Clear everything. Note we don't initialize spinlocks
5242 * are they aren't supposed to be taken by any of the
5243 * NAPI code and this dummy netdev is supposed to be
5244 * only ever used for NAPI polls
5246 memset(dev, 0, sizeof(struct net_device));
5248 /* make sure we BUG if trying to hit standard
5249 * register/unregister code path
5251 dev->reg_state = NETREG_DUMMY;
5253 /* NAPI wants this */
5254 INIT_LIST_HEAD(&dev->napi_list);
5256 /* a dummy interface is started by default */
5257 set_bit(__LINK_STATE_PRESENT, &dev->state);
5258 set_bit(__LINK_STATE_START, &dev->state);
5260 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5261 * because users of this 'device' dont need to change
5267 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5271 * register_netdev - register a network device
5272 * @dev: device to register
5274 * Take a completed network device structure and add it to the kernel
5275 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5276 * chain. 0 is returned on success. A negative errno code is returned
5277 * on a failure to set up the device, or if the name is a duplicate.
5279 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5280 * and expands the device name if you passed a format string to
5283 int register_netdev(struct net_device *dev)
5290 * If the name is a format string the caller wants us to do a
5293 if (strchr(dev->name, '%')) {
5294 err = dev_alloc_name(dev, dev->name);
5299 err = register_netdevice(dev);
5304 EXPORT_SYMBOL(register_netdev);
5306 int netdev_refcnt_read(const struct net_device *dev)
5310 for_each_possible_cpu(i)
5311 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5314 EXPORT_SYMBOL(netdev_refcnt_read);
5317 * netdev_wait_allrefs - wait until all references are gone.
5319 * This is called when unregistering network devices.
5321 * Any protocol or device that holds a reference should register
5322 * for netdevice notification, and cleanup and put back the
5323 * reference if they receive an UNREGISTER event.
5324 * We can get stuck here if buggy protocols don't correctly
5327 static void netdev_wait_allrefs(struct net_device *dev)
5329 unsigned long rebroadcast_time, warning_time;
5332 linkwatch_forget_dev(dev);
5334 rebroadcast_time = warning_time = jiffies;
5335 refcnt = netdev_refcnt_read(dev);
5337 while (refcnt != 0) {
5338 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5341 /* Rebroadcast unregister notification */
5342 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5343 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5344 * should have already handle it the first time */
5346 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5348 /* We must not have linkwatch events
5349 * pending on unregister. If this
5350 * happens, we simply run the queue
5351 * unscheduled, resulting in a noop
5354 linkwatch_run_queue();
5359 rebroadcast_time = jiffies;
5364 refcnt = netdev_refcnt_read(dev);
5366 if (time_after(jiffies, warning_time + 10 * HZ)) {
5367 printk(KERN_EMERG "unregister_netdevice: "
5368 "waiting for %s to become free. Usage "
5371 warning_time = jiffies;
5380 * register_netdevice(x1);
5381 * register_netdevice(x2);
5383 * unregister_netdevice(y1);
5384 * unregister_netdevice(y2);
5390 * We are invoked by rtnl_unlock().
5391 * This allows us to deal with problems:
5392 * 1) We can delete sysfs objects which invoke hotplug
5393 * without deadlocking with linkwatch via keventd.
5394 * 2) Since we run with the RTNL semaphore not held, we can sleep
5395 * safely in order to wait for the netdev refcnt to drop to zero.
5397 * We must not return until all unregister events added during
5398 * the interval the lock was held have been completed.
5400 void netdev_run_todo(void)
5402 struct list_head list;
5404 /* Snapshot list, allow later requests */
5405 list_replace_init(&net_todo_list, &list);
5409 while (!list_empty(&list)) {
5410 struct net_device *dev
5411 = list_first_entry(&list, struct net_device, todo_list);
5412 list_del(&dev->todo_list);
5414 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5415 printk(KERN_ERR "network todo '%s' but state %d\n",
5416 dev->name, dev->reg_state);
5421 dev->reg_state = NETREG_UNREGISTERED;
5423 on_each_cpu(flush_backlog, dev, 1);
5425 netdev_wait_allrefs(dev);
5428 BUG_ON(netdev_refcnt_read(dev));
5429 WARN_ON(rcu_dereference_raw(dev->ip_ptr));
5430 WARN_ON(rcu_dereference_raw(dev->ip6_ptr));
5431 WARN_ON(dev->dn_ptr);
5433 if (dev->destructor)
5434 dev->destructor(dev);
5436 /* Free network device */
5437 kobject_put(&dev->dev.kobj);
5442 * dev_txq_stats_fold - fold tx_queues stats
5443 * @dev: device to get statistics from
5444 * @stats: struct rtnl_link_stats64 to hold results
5446 void dev_txq_stats_fold(const struct net_device *dev,
5447 struct rtnl_link_stats64 *stats)
5449 u64 tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5451 struct netdev_queue *txq;
5453 for (i = 0; i < dev->num_tx_queues; i++) {
5454 txq = netdev_get_tx_queue(dev, i);
5455 spin_lock_bh(&txq->_xmit_lock);
5456 tx_bytes += txq->tx_bytes;
5457 tx_packets += txq->tx_packets;
5458 tx_dropped += txq->tx_dropped;
5459 spin_unlock_bh(&txq->_xmit_lock);
5461 if (tx_bytes || tx_packets || tx_dropped) {
5462 stats->tx_bytes = tx_bytes;
5463 stats->tx_packets = tx_packets;
5464 stats->tx_dropped = tx_dropped;
5467 EXPORT_SYMBOL(dev_txq_stats_fold);
5469 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5470 * fields in the same order, with only the type differing.
5472 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5473 const struct net_device_stats *netdev_stats)
5475 #if BITS_PER_LONG == 64
5476 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5477 memcpy(stats64, netdev_stats, sizeof(*stats64));
5479 size_t i, n = sizeof(*stats64) / sizeof(u64);
5480 const unsigned long *src = (const unsigned long *)netdev_stats;
5481 u64 *dst = (u64 *)stats64;
5483 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5484 sizeof(*stats64) / sizeof(u64));
5485 for (i = 0; i < n; i++)
5491 * dev_get_stats - get network device statistics
5492 * @dev: device to get statistics from
5493 * @storage: place to store stats
5495 * Get network statistics from device. Return @storage.
5496 * The device driver may provide its own method by setting
5497 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5498 * otherwise the internal statistics structure is used.
5500 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5501 struct rtnl_link_stats64 *storage)
5503 const struct net_device_ops *ops = dev->netdev_ops;
5505 if (ops->ndo_get_stats64) {
5506 memset(storage, 0, sizeof(*storage));
5507 ops->ndo_get_stats64(dev, storage);
5508 } else if (ops->ndo_get_stats) {
5509 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5511 netdev_stats_to_stats64(storage, &dev->stats);
5512 dev_txq_stats_fold(dev, storage);
5514 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5517 EXPORT_SYMBOL(dev_get_stats);
5519 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5521 struct netdev_queue *queue = dev_ingress_queue(dev);
5523 #ifdef CONFIG_NET_CLS_ACT
5526 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5529 netdev_init_one_queue(dev, queue, NULL);
5530 queue->qdisc = &noop_qdisc;
5531 queue->qdisc_sleeping = &noop_qdisc;
5532 rcu_assign_pointer(dev->ingress_queue, queue);
5538 * alloc_netdev_mq - allocate network device
5539 * @sizeof_priv: size of private data to allocate space for
5540 * @name: device name format string
5541 * @setup: callback to initialize device
5542 * @queue_count: the number of subqueues to allocate
5544 * Allocates a struct net_device with private data area for driver use
5545 * and performs basic initialization. Also allocates subquue structs
5546 * for each queue on the device at the end of the netdevice.
5548 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5549 void (*setup)(struct net_device *), unsigned int queue_count)
5551 struct net_device *dev;
5553 struct net_device *p;
5555 BUG_ON(strlen(name) >= sizeof(dev->name));
5557 if (queue_count < 1) {
5558 pr_err("alloc_netdev: Unable to allocate device "
5559 "with zero queues.\n");
5563 alloc_size = sizeof(struct net_device);
5565 /* ensure 32-byte alignment of private area */
5566 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5567 alloc_size += sizeof_priv;
5569 /* ensure 32-byte alignment of whole construct */
5570 alloc_size += NETDEV_ALIGN - 1;
5572 p = kzalloc(alloc_size, GFP_KERNEL);
5574 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5578 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5579 dev->padded = (char *)dev - (char *)p;
5581 dev->pcpu_refcnt = alloc_percpu(int);
5582 if (!dev->pcpu_refcnt)
5585 if (dev_addr_init(dev))
5591 dev_net_set(dev, &init_net);
5593 dev->num_tx_queues = queue_count;
5594 dev->real_num_tx_queues = queue_count;
5595 if (netif_alloc_netdev_queues(dev))
5599 dev->num_rx_queues = queue_count;
5600 dev->real_num_rx_queues = queue_count;
5601 if (netif_alloc_rx_queues(dev))
5605 dev->gso_max_size = GSO_MAX_SIZE;
5607 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5608 dev->ethtool_ntuple_list.count = 0;
5609 INIT_LIST_HEAD(&dev->napi_list);
5610 INIT_LIST_HEAD(&dev->unreg_list);
5611 INIT_LIST_HEAD(&dev->link_watch_list);
5612 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5614 strcpy(dev->name, name);
5618 free_percpu(dev->pcpu_refcnt);
5628 EXPORT_SYMBOL(alloc_netdev_mq);
5631 * free_netdev - free network device
5634 * This function does the last stage of destroying an allocated device
5635 * interface. The reference to the device object is released.
5636 * If this is the last reference then it will be freed.
5638 void free_netdev(struct net_device *dev)
5640 struct napi_struct *p, *n;
5642 release_net(dev_net(dev));
5649 kfree(rcu_dereference_raw(dev->ingress_queue));
5651 /* Flush device addresses */
5652 dev_addr_flush(dev);
5654 /* Clear ethtool n-tuple list */
5655 ethtool_ntuple_flush(dev);
5657 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5660 free_percpu(dev->pcpu_refcnt);
5661 dev->pcpu_refcnt = NULL;
5663 /* Compatibility with error handling in drivers */
5664 if (dev->reg_state == NETREG_UNINITIALIZED) {
5665 kfree((char *)dev - dev->padded);
5669 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5670 dev->reg_state = NETREG_RELEASED;
5672 /* will free via device release */
5673 put_device(&dev->dev);
5675 EXPORT_SYMBOL(free_netdev);
5678 * synchronize_net - Synchronize with packet receive processing
5680 * Wait for packets currently being received to be done.
5681 * Does not block later packets from starting.
5683 void synchronize_net(void)
5688 EXPORT_SYMBOL(synchronize_net);
5691 * unregister_netdevice_queue - remove device from the kernel
5695 * This function shuts down a device interface and removes it
5696 * from the kernel tables.
5697 * If head not NULL, device is queued to be unregistered later.
5699 * Callers must hold the rtnl semaphore. You may want
5700 * unregister_netdev() instead of this.
5703 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5708 list_move_tail(&dev->unreg_list, head);
5710 rollback_registered(dev);
5711 /* Finish processing unregister after unlock */
5715 EXPORT_SYMBOL(unregister_netdevice_queue);
5718 * unregister_netdevice_many - unregister many devices
5719 * @head: list of devices
5721 void unregister_netdevice_many(struct list_head *head)
5723 struct net_device *dev;
5725 if (!list_empty(head)) {
5726 rollback_registered_many(head);
5727 list_for_each_entry(dev, head, unreg_list)
5731 EXPORT_SYMBOL(unregister_netdevice_many);
5734 * unregister_netdev - remove device from the kernel
5737 * This function shuts down a device interface and removes it
5738 * from the kernel tables.
5740 * This is just a wrapper for unregister_netdevice that takes
5741 * the rtnl semaphore. In general you want to use this and not
5742 * unregister_netdevice.
5744 void unregister_netdev(struct net_device *dev)
5747 unregister_netdevice(dev);
5750 EXPORT_SYMBOL(unregister_netdev);
5753 * dev_change_net_namespace - move device to different nethost namespace
5755 * @net: network namespace
5756 * @pat: If not NULL name pattern to try if the current device name
5757 * is already taken in the destination network namespace.
5759 * This function shuts down a device interface and moves it
5760 * to a new network namespace. On success 0 is returned, on
5761 * a failure a netagive errno code is returned.
5763 * Callers must hold the rtnl semaphore.
5766 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5772 /* Don't allow namespace local devices to be moved. */
5774 if (dev->features & NETIF_F_NETNS_LOCAL)
5777 /* Ensure the device has been registrered */
5779 if (dev->reg_state != NETREG_REGISTERED)
5782 /* Get out if there is nothing todo */
5784 if (net_eq(dev_net(dev), net))
5787 /* Pick the destination device name, and ensure
5788 * we can use it in the destination network namespace.
5791 if (__dev_get_by_name(net, dev->name)) {
5792 /* We get here if we can't use the current device name */
5795 if (dev_get_valid_name(dev, pat, 1))
5800 * And now a mini version of register_netdevice unregister_netdevice.
5803 /* If device is running close it first. */
5806 /* And unlink it from device chain */
5808 unlist_netdevice(dev);
5812 /* Shutdown queueing discipline. */
5815 /* Notify protocols, that we are about to destroy
5816 this device. They should clean all the things.
5818 Note that dev->reg_state stays at NETREG_REGISTERED.
5819 This is wanted because this way 8021q and macvlan know
5820 the device is just moving and can keep their slaves up.
5822 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5823 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5826 * Flush the unicast and multicast chains
5831 /* Actually switch the network namespace */
5832 dev_net_set(dev, net);
5834 /* If there is an ifindex conflict assign a new one */
5835 if (__dev_get_by_index(net, dev->ifindex)) {
5836 int iflink = (dev->iflink == dev->ifindex);
5837 dev->ifindex = dev_new_index(net);
5839 dev->iflink = dev->ifindex;
5842 /* Fixup kobjects */
5843 err = device_rename(&dev->dev, dev->name);
5846 /* Add the device back in the hashes */
5847 list_netdevice(dev);
5849 /* Notify protocols, that a new device appeared. */
5850 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5853 * Prevent userspace races by waiting until the network
5854 * device is fully setup before sending notifications.
5856 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5863 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5865 static int dev_cpu_callback(struct notifier_block *nfb,
5866 unsigned long action,
5869 struct sk_buff **list_skb;
5870 struct sk_buff *skb;
5871 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5872 struct softnet_data *sd, *oldsd;
5874 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5877 local_irq_disable();
5878 cpu = smp_processor_id();
5879 sd = &per_cpu(softnet_data, cpu);
5880 oldsd = &per_cpu(softnet_data, oldcpu);
5882 /* Find end of our completion_queue. */
5883 list_skb = &sd->completion_queue;
5885 list_skb = &(*list_skb)->next;
5886 /* Append completion queue from offline CPU. */
5887 *list_skb = oldsd->completion_queue;
5888 oldsd->completion_queue = NULL;
5890 /* Append output queue from offline CPU. */
5891 if (oldsd->output_queue) {
5892 *sd->output_queue_tailp = oldsd->output_queue;
5893 sd->output_queue_tailp = oldsd->output_queue_tailp;
5894 oldsd->output_queue = NULL;
5895 oldsd->output_queue_tailp = &oldsd->output_queue;
5898 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5901 /* Process offline CPU's input_pkt_queue */
5902 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
5904 input_queue_head_incr(oldsd);
5906 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5908 input_queue_head_incr(oldsd);
5916 * netdev_increment_features - increment feature set by one
5917 * @all: current feature set
5918 * @one: new feature set
5919 * @mask: mask feature set
5921 * Computes a new feature set after adding a device with feature set
5922 * @one to the master device with current feature set @all. Will not
5923 * enable anything that is off in @mask. Returns the new feature set.
5925 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5928 /* If device needs checksumming, downgrade to it. */
5929 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5930 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5931 else if (mask & NETIF_F_ALL_CSUM) {
5932 /* If one device supports v4/v6 checksumming, set for all. */
5933 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5934 !(all & NETIF_F_GEN_CSUM)) {
5935 all &= ~NETIF_F_ALL_CSUM;
5936 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5939 /* If one device supports hw checksumming, set for all. */
5940 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5941 all &= ~NETIF_F_ALL_CSUM;
5942 all |= NETIF_F_HW_CSUM;
5946 one |= NETIF_F_ALL_CSUM;
5948 one |= all & NETIF_F_ONE_FOR_ALL;
5949 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5950 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5954 EXPORT_SYMBOL(netdev_increment_features);
5956 static struct hlist_head *netdev_create_hash(void)
5959 struct hlist_head *hash;
5961 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5963 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5964 INIT_HLIST_HEAD(&hash[i]);
5969 /* Initialize per network namespace state */
5970 static int __net_init netdev_init(struct net *net)
5972 INIT_LIST_HEAD(&net->dev_base_head);
5974 net->dev_name_head = netdev_create_hash();
5975 if (net->dev_name_head == NULL)
5978 net->dev_index_head = netdev_create_hash();
5979 if (net->dev_index_head == NULL)
5985 kfree(net->dev_name_head);
5991 * netdev_drivername - network driver for the device
5992 * @dev: network device
5993 * @buffer: buffer for resulting name
5994 * @len: size of buffer
5996 * Determine network driver for device.
5998 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
6000 const struct device_driver *driver;
6001 const struct device *parent;
6003 if (len <= 0 || !buffer)
6007 parent = dev->dev.parent;
6012 driver = parent->driver;
6013 if (driver && driver->name)
6014 strlcpy(buffer, driver->name, len);
6018 static int __netdev_printk(const char *level, const struct net_device *dev,
6019 struct va_format *vaf)
6023 if (dev && dev->dev.parent)
6024 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6025 netdev_name(dev), vaf);
6027 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6029 r = printk("%s(NULL net_device): %pV", level, vaf);
6034 int netdev_printk(const char *level, const struct net_device *dev,
6035 const char *format, ...)
6037 struct va_format vaf;
6041 va_start(args, format);
6046 r = __netdev_printk(level, dev, &vaf);
6051 EXPORT_SYMBOL(netdev_printk);
6053 #define define_netdev_printk_level(func, level) \
6054 int func(const struct net_device *dev, const char *fmt, ...) \
6057 struct va_format vaf; \
6060 va_start(args, fmt); \
6065 r = __netdev_printk(level, dev, &vaf); \
6070 EXPORT_SYMBOL(func);
6072 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6073 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6074 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6075 define_netdev_printk_level(netdev_err, KERN_ERR);
6076 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6077 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6078 define_netdev_printk_level(netdev_info, KERN_INFO);
6080 static void __net_exit netdev_exit(struct net *net)
6082 kfree(net->dev_name_head);
6083 kfree(net->dev_index_head);
6086 static struct pernet_operations __net_initdata netdev_net_ops = {
6087 .init = netdev_init,
6088 .exit = netdev_exit,
6091 static void __net_exit default_device_exit(struct net *net)
6093 struct net_device *dev, *aux;
6095 * Push all migratable network devices back to the
6096 * initial network namespace
6099 for_each_netdev_safe(net, dev, aux) {
6101 char fb_name[IFNAMSIZ];
6103 /* Ignore unmoveable devices (i.e. loopback) */
6104 if (dev->features & NETIF_F_NETNS_LOCAL)
6107 /* Leave virtual devices for the generic cleanup */
6108 if (dev->rtnl_link_ops)
6111 /* Push remaing network devices to init_net */
6112 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6113 err = dev_change_net_namespace(dev, &init_net, fb_name);
6115 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6116 __func__, dev->name, err);
6123 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6125 /* At exit all network devices most be removed from a network
6126 * namespace. Do this in the reverse order of registeration.
6127 * Do this across as many network namespaces as possible to
6128 * improve batching efficiency.
6130 struct net_device *dev;
6132 LIST_HEAD(dev_kill_list);
6135 list_for_each_entry(net, net_list, exit_list) {
6136 for_each_netdev_reverse(net, dev) {
6137 if (dev->rtnl_link_ops)
6138 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6140 unregister_netdevice_queue(dev, &dev_kill_list);
6143 unregister_netdevice_many(&dev_kill_list);
6147 static struct pernet_operations __net_initdata default_device_ops = {
6148 .exit = default_device_exit,
6149 .exit_batch = default_device_exit_batch,
6153 * Initialize the DEV module. At boot time this walks the device list and
6154 * unhooks any devices that fail to initialise (normally hardware not
6155 * present) and leaves us with a valid list of present and active devices.
6160 * This is called single threaded during boot, so no need
6161 * to take the rtnl semaphore.
6163 static int __init net_dev_init(void)
6165 int i, rc = -ENOMEM;
6167 BUG_ON(!dev_boot_phase);
6169 if (dev_proc_init())
6172 if (netdev_kobject_init())
6175 INIT_LIST_HEAD(&ptype_all);
6176 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6177 INIT_LIST_HEAD(&ptype_base[i]);
6179 if (register_pernet_subsys(&netdev_net_ops))
6183 * Initialise the packet receive queues.
6186 for_each_possible_cpu(i) {
6187 struct softnet_data *sd = &per_cpu(softnet_data, i);
6189 memset(sd, 0, sizeof(*sd));
6190 skb_queue_head_init(&sd->input_pkt_queue);
6191 skb_queue_head_init(&sd->process_queue);
6192 sd->completion_queue = NULL;
6193 INIT_LIST_HEAD(&sd->poll_list);
6194 sd->output_queue = NULL;
6195 sd->output_queue_tailp = &sd->output_queue;
6197 sd->csd.func = rps_trigger_softirq;
6203 sd->backlog.poll = process_backlog;
6204 sd->backlog.weight = weight_p;
6205 sd->backlog.gro_list = NULL;
6206 sd->backlog.gro_count = 0;
6211 /* The loopback device is special if any other network devices
6212 * is present in a network namespace the loopback device must
6213 * be present. Since we now dynamically allocate and free the
6214 * loopback device ensure this invariant is maintained by
6215 * keeping the loopback device as the first device on the
6216 * list of network devices. Ensuring the loopback devices
6217 * is the first device that appears and the last network device
6220 if (register_pernet_device(&loopback_net_ops))
6223 if (register_pernet_device(&default_device_ops))
6226 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6227 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6229 hotcpu_notifier(dev_cpu_callback, 0);
6237 subsys_initcall(net_dev_init);
6239 static int __init initialize_hashrnd(void)
6241 get_random_bytes(&hashrnd, sizeof(hashrnd));
6245 late_initcall_sync(initialize_hashrnd);