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;
1972 * Returns true if either:
1973 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
1974 * 2. skb is fragmented and the device does not support SG, or if
1975 * at least one of fragments is in highmem and device does not
1976 * support DMA from it.
1978 static inline int skb_needs_linearize(struct sk_buff *skb,
1979 struct net_device *dev)
1981 if (skb_is_nonlinear(skb)) {
1982 int features = dev->features;
1984 if (vlan_tx_tag_present(skb))
1985 features &= dev->vlan_features;
1987 return (skb_has_frag_list(skb) &&
1988 !(features & NETIF_F_FRAGLIST)) ||
1989 (skb_shinfo(skb)->nr_frags &&
1990 (!(features & NETIF_F_SG) ||
1991 illegal_highdma(dev, skb)));
1997 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1998 struct netdev_queue *txq)
2000 const struct net_device_ops *ops = dev->netdev_ops;
2001 int rc = NETDEV_TX_OK;
2003 if (likely(!skb->next)) {
2004 if (!list_empty(&ptype_all))
2005 dev_queue_xmit_nit(skb, dev);
2008 * If device doesnt need skb->dst, release it right now while
2009 * its hot in this cpu cache
2011 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2014 skb_orphan_try(skb);
2016 if (vlan_tx_tag_present(skb) &&
2017 !(dev->features & NETIF_F_HW_VLAN_TX)) {
2018 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2025 if (netif_needs_gso(dev, skb)) {
2026 if (unlikely(dev_gso_segment(skb)))
2031 if (skb_needs_linearize(skb, dev) &&
2032 __skb_linearize(skb))
2035 /* If packet is not checksummed and device does not
2036 * support checksumming for this protocol, complete
2037 * checksumming here.
2039 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2040 skb_set_transport_header(skb, skb->csum_start -
2042 if (!dev_can_checksum(dev, skb) &&
2043 skb_checksum_help(skb))
2048 rc = ops->ndo_start_xmit(skb, dev);
2049 trace_net_dev_xmit(skb, rc);
2050 if (rc == NETDEV_TX_OK)
2051 txq_trans_update(txq);
2057 struct sk_buff *nskb = skb->next;
2059 skb->next = nskb->next;
2063 * If device doesnt need nskb->dst, release it right now while
2064 * its hot in this cpu cache
2066 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2069 rc = ops->ndo_start_xmit(nskb, dev);
2070 trace_net_dev_xmit(nskb, rc);
2071 if (unlikely(rc != NETDEV_TX_OK)) {
2072 if (rc & ~NETDEV_TX_MASK)
2073 goto out_kfree_gso_skb;
2074 nskb->next = skb->next;
2078 txq_trans_update(txq);
2079 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2080 return NETDEV_TX_BUSY;
2081 } while (skb->next);
2084 if (likely(skb->next == NULL))
2085 skb->destructor = DEV_GSO_CB(skb)->destructor;
2092 static u32 hashrnd __read_mostly;
2094 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
2098 if (skb_rx_queue_recorded(skb)) {
2099 hash = skb_get_rx_queue(skb);
2100 while (unlikely(hash >= dev->real_num_tx_queues))
2101 hash -= dev->real_num_tx_queues;
2105 if (skb->sk && skb->sk->sk_hash)
2106 hash = skb->sk->sk_hash;
2108 hash = (__force u16) skb->protocol ^ skb->rxhash;
2109 hash = jhash_1word(hash, hashrnd);
2111 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
2113 EXPORT_SYMBOL(skb_tx_hash);
2115 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2117 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2118 if (net_ratelimit()) {
2119 pr_warning("%s selects TX queue %d, but "
2120 "real number of TX queues is %d\n",
2121 dev->name, queue_index, dev->real_num_tx_queues);
2128 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
2129 struct sk_buff *skb)
2132 const struct net_device_ops *ops = dev->netdev_ops;
2134 if (ops->ndo_select_queue) {
2135 queue_index = ops->ndo_select_queue(dev, skb);
2136 queue_index = dev_cap_txqueue(dev, queue_index);
2138 struct sock *sk = skb->sk;
2139 queue_index = sk_tx_queue_get(sk);
2140 if (queue_index < 0 || queue_index >= dev->real_num_tx_queues) {
2143 if (dev->real_num_tx_queues > 1)
2144 queue_index = skb_tx_hash(dev, skb);
2147 struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
2149 if (dst && skb_dst(skb) == dst)
2150 sk_tx_queue_set(sk, queue_index);
2155 skb_set_queue_mapping(skb, queue_index);
2156 return netdev_get_tx_queue(dev, queue_index);
2159 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2160 struct net_device *dev,
2161 struct netdev_queue *txq)
2163 spinlock_t *root_lock = qdisc_lock(q);
2164 bool contended = qdisc_is_running(q);
2168 * Heuristic to force contended enqueues to serialize on a
2169 * separate lock before trying to get qdisc main lock.
2170 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2171 * and dequeue packets faster.
2173 if (unlikely(contended))
2174 spin_lock(&q->busylock);
2176 spin_lock(root_lock);
2177 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2180 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2181 qdisc_run_begin(q)) {
2183 * This is a work-conserving queue; there are no old skbs
2184 * waiting to be sent out; and the qdisc is not running -
2185 * xmit the skb directly.
2187 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2189 __qdisc_update_bstats(q, skb->len);
2190 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2191 if (unlikely(contended)) {
2192 spin_unlock(&q->busylock);
2199 rc = NET_XMIT_SUCCESS;
2202 rc = qdisc_enqueue_root(skb, q);
2203 if (qdisc_run_begin(q)) {
2204 if (unlikely(contended)) {
2205 spin_unlock(&q->busylock);
2211 spin_unlock(root_lock);
2212 if (unlikely(contended))
2213 spin_unlock(&q->busylock);
2217 static DEFINE_PER_CPU(int, xmit_recursion);
2218 #define RECURSION_LIMIT 10
2221 * dev_queue_xmit - transmit a buffer
2222 * @skb: buffer to transmit
2224 * Queue a buffer for transmission to a network device. The caller must
2225 * have set the device and priority and built the buffer before calling
2226 * this function. The function can be called from an interrupt.
2228 * A negative errno code is returned on a failure. A success does not
2229 * guarantee the frame will be transmitted as it may be dropped due
2230 * to congestion or traffic shaping.
2232 * -----------------------------------------------------------------------------------
2233 * I notice this method can also return errors from the queue disciplines,
2234 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2237 * Regardless of the return value, the skb is consumed, so it is currently
2238 * difficult to retry a send to this method. (You can bump the ref count
2239 * before sending to hold a reference for retry if you are careful.)
2241 * When calling this method, interrupts MUST be enabled. This is because
2242 * the BH enable code must have IRQs enabled so that it will not deadlock.
2245 int dev_queue_xmit(struct sk_buff *skb)
2247 struct net_device *dev = skb->dev;
2248 struct netdev_queue *txq;
2252 /* Disable soft irqs for various locks below. Also
2253 * stops preemption for RCU.
2257 txq = dev_pick_tx(dev, skb);
2258 q = rcu_dereference_bh(txq->qdisc);
2260 #ifdef CONFIG_NET_CLS_ACT
2261 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2263 trace_net_dev_queue(skb);
2265 rc = __dev_xmit_skb(skb, q, dev, txq);
2269 /* The device has no queue. Common case for software devices:
2270 loopback, all the sorts of tunnels...
2272 Really, it is unlikely that netif_tx_lock protection is necessary
2273 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2275 However, it is possible, that they rely on protection
2278 Check this and shot the lock. It is not prone from deadlocks.
2279 Either shot noqueue qdisc, it is even simpler 8)
2281 if (dev->flags & IFF_UP) {
2282 int cpu = smp_processor_id(); /* ok because BHs are off */
2284 if (txq->xmit_lock_owner != cpu) {
2286 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2287 goto recursion_alert;
2289 HARD_TX_LOCK(dev, txq, cpu);
2291 if (!netif_tx_queue_stopped(txq)) {
2292 __this_cpu_inc(xmit_recursion);
2293 rc = dev_hard_start_xmit(skb, dev, txq);
2294 __this_cpu_dec(xmit_recursion);
2295 if (dev_xmit_complete(rc)) {
2296 HARD_TX_UNLOCK(dev, txq);
2300 HARD_TX_UNLOCK(dev, txq);
2301 if (net_ratelimit())
2302 printk(KERN_CRIT "Virtual device %s asks to "
2303 "queue packet!\n", dev->name);
2305 /* Recursion is detected! It is possible,
2309 if (net_ratelimit())
2310 printk(KERN_CRIT "Dead loop on virtual device "
2311 "%s, fix it urgently!\n", dev->name);
2316 rcu_read_unlock_bh();
2321 rcu_read_unlock_bh();
2324 EXPORT_SYMBOL(dev_queue_xmit);
2327 /*=======================================================================
2329 =======================================================================*/
2331 int netdev_max_backlog __read_mostly = 1000;
2332 int netdev_tstamp_prequeue __read_mostly = 1;
2333 int netdev_budget __read_mostly = 300;
2334 int weight_p __read_mostly = 64; /* old backlog weight */
2336 /* Called with irq disabled */
2337 static inline void ____napi_schedule(struct softnet_data *sd,
2338 struct napi_struct *napi)
2340 list_add_tail(&napi->poll_list, &sd->poll_list);
2341 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2345 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2346 * and src/dst port numbers. Returns a non-zero hash number on success
2349 __u32 __skb_get_rxhash(struct sk_buff *skb)
2351 int nhoff, hash = 0, poff;
2352 struct ipv6hdr *ip6;
2355 u32 addr1, addr2, ihl;
2361 nhoff = skb_network_offset(skb);
2363 switch (skb->protocol) {
2364 case __constant_htons(ETH_P_IP):
2365 if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
2368 ip = (struct iphdr *) (skb->data + nhoff);
2369 if (ip->frag_off & htons(IP_MF | IP_OFFSET))
2372 ip_proto = ip->protocol;
2373 addr1 = (__force u32) ip->saddr;
2374 addr2 = (__force u32) ip->daddr;
2377 case __constant_htons(ETH_P_IPV6):
2378 if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
2381 ip6 = (struct ipv6hdr *) (skb->data + nhoff);
2382 ip_proto = ip6->nexthdr;
2383 addr1 = (__force u32) ip6->saddr.s6_addr32[3];
2384 addr2 = (__force u32) ip6->daddr.s6_addr32[3];
2392 poff = proto_ports_offset(ip_proto);
2394 nhoff += ihl * 4 + poff;
2395 if (pskb_may_pull(skb, nhoff + 4)) {
2396 ports.v32 = * (__force u32 *) (skb->data + nhoff);
2397 if (ports.v16[1] < ports.v16[0])
2398 swap(ports.v16[0], ports.v16[1]);
2402 /* get a consistent hash (same value on both flow directions) */
2406 hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
2413 EXPORT_SYMBOL(__skb_get_rxhash);
2417 /* One global table that all flow-based protocols share. */
2418 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2419 EXPORT_SYMBOL(rps_sock_flow_table);
2422 * get_rps_cpu is called from netif_receive_skb and returns the target
2423 * CPU from the RPS map of the receiving queue for a given skb.
2424 * rcu_read_lock must be held on entry.
2426 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2427 struct rps_dev_flow **rflowp)
2429 struct netdev_rx_queue *rxqueue;
2430 struct rps_map *map;
2431 struct rps_dev_flow_table *flow_table;
2432 struct rps_sock_flow_table *sock_flow_table;
2436 if (skb_rx_queue_recorded(skb)) {
2437 u16 index = skb_get_rx_queue(skb);
2438 if (unlikely(index >= dev->real_num_rx_queues)) {
2439 WARN_ONCE(dev->real_num_rx_queues > 1,
2440 "%s received packet on queue %u, but number "
2441 "of RX queues is %u\n",
2442 dev->name, index, dev->real_num_rx_queues);
2445 rxqueue = dev->_rx + index;
2449 map = rcu_dereference(rxqueue->rps_map);
2451 if (map->len == 1) {
2452 tcpu = map->cpus[0];
2453 if (cpu_online(tcpu))
2457 } else if (!rcu_dereference_raw(rxqueue->rps_flow_table)) {
2461 skb_reset_network_header(skb);
2462 if (!skb_get_rxhash(skb))
2465 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2466 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2467 if (flow_table && sock_flow_table) {
2469 struct rps_dev_flow *rflow;
2471 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2474 next_cpu = sock_flow_table->ents[skb->rxhash &
2475 sock_flow_table->mask];
2478 * If the desired CPU (where last recvmsg was done) is
2479 * different from current CPU (one in the rx-queue flow
2480 * table entry), switch if one of the following holds:
2481 * - Current CPU is unset (equal to RPS_NO_CPU).
2482 * - Current CPU is offline.
2483 * - The current CPU's queue tail has advanced beyond the
2484 * last packet that was enqueued using this table entry.
2485 * This guarantees that all previous packets for the flow
2486 * have been dequeued, thus preserving in order delivery.
2488 if (unlikely(tcpu != next_cpu) &&
2489 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2490 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2491 rflow->last_qtail)) >= 0)) {
2492 tcpu = rflow->cpu = next_cpu;
2493 if (tcpu != RPS_NO_CPU)
2494 rflow->last_qtail = per_cpu(softnet_data,
2495 tcpu).input_queue_head;
2497 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2505 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2507 if (cpu_online(tcpu)) {
2517 /* Called from hardirq (IPI) context */
2518 static void rps_trigger_softirq(void *data)
2520 struct softnet_data *sd = data;
2522 ____napi_schedule(sd, &sd->backlog);
2526 #endif /* CONFIG_RPS */
2529 * Check if this softnet_data structure is another cpu one
2530 * If yes, queue it to our IPI list and return 1
2533 static int rps_ipi_queued(struct softnet_data *sd)
2536 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
2539 sd->rps_ipi_next = mysd->rps_ipi_list;
2540 mysd->rps_ipi_list = sd;
2542 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2545 #endif /* CONFIG_RPS */
2550 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2551 * queue (may be a remote CPU queue).
2553 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
2554 unsigned int *qtail)
2556 struct softnet_data *sd;
2557 unsigned long flags;
2559 sd = &per_cpu(softnet_data, cpu);
2561 local_irq_save(flags);
2564 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
2565 if (skb_queue_len(&sd->input_pkt_queue)) {
2567 __skb_queue_tail(&sd->input_pkt_queue, skb);
2568 input_queue_tail_incr_save(sd, qtail);
2570 local_irq_restore(flags);
2571 return NET_RX_SUCCESS;
2574 /* Schedule NAPI for backlog device
2575 * We can use non atomic operation since we own the queue lock
2577 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
2578 if (!rps_ipi_queued(sd))
2579 ____napi_schedule(sd, &sd->backlog);
2587 local_irq_restore(flags);
2589 atomic_long_inc(&skb->dev->rx_dropped);
2595 * netif_rx - post buffer to the network code
2596 * @skb: buffer to post
2598 * This function receives a packet from a device driver and queues it for
2599 * the upper (protocol) levels to process. It always succeeds. The buffer
2600 * may be dropped during processing for congestion control or by the
2604 * NET_RX_SUCCESS (no congestion)
2605 * NET_RX_DROP (packet was dropped)
2609 int netif_rx(struct sk_buff *skb)
2613 /* if netpoll wants it, pretend we never saw it */
2614 if (netpoll_rx(skb))
2617 if (netdev_tstamp_prequeue)
2618 net_timestamp_check(skb);
2620 trace_netif_rx(skb);
2623 struct rps_dev_flow voidflow, *rflow = &voidflow;
2629 cpu = get_rps_cpu(skb->dev, skb, &rflow);
2631 cpu = smp_processor_id();
2633 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
2641 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
2647 EXPORT_SYMBOL(netif_rx);
2649 int netif_rx_ni(struct sk_buff *skb)
2654 err = netif_rx(skb);
2655 if (local_softirq_pending())
2661 EXPORT_SYMBOL(netif_rx_ni);
2663 static void net_tx_action(struct softirq_action *h)
2665 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2667 if (sd->completion_queue) {
2668 struct sk_buff *clist;
2670 local_irq_disable();
2671 clist = sd->completion_queue;
2672 sd->completion_queue = NULL;
2676 struct sk_buff *skb = clist;
2677 clist = clist->next;
2679 WARN_ON(atomic_read(&skb->users));
2680 trace_kfree_skb(skb, net_tx_action);
2685 if (sd->output_queue) {
2688 local_irq_disable();
2689 head = sd->output_queue;
2690 sd->output_queue = NULL;
2691 sd->output_queue_tailp = &sd->output_queue;
2695 struct Qdisc *q = head;
2696 spinlock_t *root_lock;
2698 head = head->next_sched;
2700 root_lock = qdisc_lock(q);
2701 if (spin_trylock(root_lock)) {
2702 smp_mb__before_clear_bit();
2703 clear_bit(__QDISC_STATE_SCHED,
2706 spin_unlock(root_lock);
2708 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2710 __netif_reschedule(q);
2712 smp_mb__before_clear_bit();
2713 clear_bit(__QDISC_STATE_SCHED,
2721 static inline int deliver_skb(struct sk_buff *skb,
2722 struct packet_type *pt_prev,
2723 struct net_device *orig_dev)
2725 atomic_inc(&skb->users);
2726 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2729 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
2730 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
2731 /* This hook is defined here for ATM LANE */
2732 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2733 unsigned char *addr) __read_mostly;
2734 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2737 #ifdef CONFIG_NET_CLS_ACT
2738 /* TODO: Maybe we should just force sch_ingress to be compiled in
2739 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2740 * a compare and 2 stores extra right now if we dont have it on
2741 * but have CONFIG_NET_CLS_ACT
2742 * NOTE: This doesnt stop any functionality; if you dont have
2743 * the ingress scheduler, you just cant add policies on ingress.
2746 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
2748 struct net_device *dev = skb->dev;
2749 u32 ttl = G_TC_RTTL(skb->tc_verd);
2750 int result = TC_ACT_OK;
2753 if (unlikely(MAX_RED_LOOP < ttl++)) {
2754 if (net_ratelimit())
2755 pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
2756 skb->skb_iif, dev->ifindex);
2760 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2761 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2764 if (q != &noop_qdisc) {
2765 spin_lock(qdisc_lock(q));
2766 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2767 result = qdisc_enqueue_root(skb, q);
2768 spin_unlock(qdisc_lock(q));
2774 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2775 struct packet_type **pt_prev,
2776 int *ret, struct net_device *orig_dev)
2778 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
2780 if (!rxq || rxq->qdisc == &noop_qdisc)
2784 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2788 switch (ing_filter(skb, rxq)) {
2802 * netdev_rx_handler_register - register receive handler
2803 * @dev: device to register a handler for
2804 * @rx_handler: receive handler to register
2805 * @rx_handler_data: data pointer that is used by rx handler
2807 * Register a receive hander for a device. This handler will then be
2808 * called from __netif_receive_skb. A negative errno code is returned
2811 * The caller must hold the rtnl_mutex.
2813 int netdev_rx_handler_register(struct net_device *dev,
2814 rx_handler_func_t *rx_handler,
2815 void *rx_handler_data)
2819 if (dev->rx_handler)
2822 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
2823 rcu_assign_pointer(dev->rx_handler, rx_handler);
2827 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
2830 * netdev_rx_handler_unregister - unregister receive handler
2831 * @dev: device to unregister a handler from
2833 * Unregister a receive hander from a device.
2835 * The caller must hold the rtnl_mutex.
2837 void netdev_rx_handler_unregister(struct net_device *dev)
2841 rcu_assign_pointer(dev->rx_handler, NULL);
2842 rcu_assign_pointer(dev->rx_handler_data, NULL);
2844 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
2846 static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
2847 struct net_device *master)
2849 if (skb->pkt_type == PACKET_HOST) {
2850 u16 *dest = (u16 *) eth_hdr(skb)->h_dest;
2852 memcpy(dest, master->dev_addr, ETH_ALEN);
2856 /* On bonding slaves other than the currently active slave, suppress
2857 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
2858 * ARP on active-backup slaves with arp_validate enabled.
2860 int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
2862 struct net_device *dev = skb->dev;
2864 if (master->priv_flags & IFF_MASTER_ARPMON)
2865 dev->last_rx = jiffies;
2867 if ((master->priv_flags & IFF_MASTER_ALB) &&
2868 (master->priv_flags & IFF_BRIDGE_PORT)) {
2869 /* Do address unmangle. The local destination address
2870 * will be always the one master has. Provides the right
2871 * functionality in a bridge.
2873 skb_bond_set_mac_by_master(skb, master);
2876 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
2877 if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
2878 skb->protocol == __cpu_to_be16(ETH_P_ARP))
2881 if (master->priv_flags & IFF_MASTER_ALB) {
2882 if (skb->pkt_type != PACKET_BROADCAST &&
2883 skb->pkt_type != PACKET_MULTICAST)
2886 if (master->priv_flags & IFF_MASTER_8023AD &&
2887 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
2894 EXPORT_SYMBOL(__skb_bond_should_drop);
2896 static int __netif_receive_skb(struct sk_buff *skb)
2898 struct packet_type *ptype, *pt_prev;
2899 rx_handler_func_t *rx_handler;
2900 struct net_device *orig_dev;
2901 struct net_device *master;
2902 struct net_device *null_or_orig;
2903 struct net_device *orig_or_bond;
2904 int ret = NET_RX_DROP;
2907 if (!netdev_tstamp_prequeue)
2908 net_timestamp_check(skb);
2910 trace_netif_receive_skb(skb);
2912 /* if we've gotten here through NAPI, check netpoll */
2913 if (netpoll_receive_skb(skb))
2917 skb->skb_iif = skb->dev->ifindex;
2920 * bonding note: skbs received on inactive slaves should only
2921 * be delivered to pkt handlers that are exact matches. Also
2922 * the deliver_no_wcard flag will be set. If packet handlers
2923 * are sensitive to duplicate packets these skbs will need to
2924 * be dropped at the handler.
2926 null_or_orig = NULL;
2927 orig_dev = skb->dev;
2928 master = ACCESS_ONCE(orig_dev->master);
2929 if (skb->deliver_no_wcard)
2930 null_or_orig = orig_dev;
2932 if (skb_bond_should_drop(skb, master)) {
2933 skb->deliver_no_wcard = 1;
2934 null_or_orig = orig_dev; /* deliver only exact match */
2939 __this_cpu_inc(softnet_data.processed);
2940 skb_reset_network_header(skb);
2941 skb_reset_transport_header(skb);
2942 skb->mac_len = skb->network_header - skb->mac_header;
2948 #ifdef CONFIG_NET_CLS_ACT
2949 if (skb->tc_verd & TC_NCLS) {
2950 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2955 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2956 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2957 ptype->dev == orig_dev) {
2959 ret = deliver_skb(skb, pt_prev, orig_dev);
2964 #ifdef CONFIG_NET_CLS_ACT
2965 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2971 /* Handle special case of bridge or macvlan */
2972 rx_handler = rcu_dereference(skb->dev->rx_handler);
2975 ret = deliver_skb(skb, pt_prev, orig_dev);
2978 skb = rx_handler(skb);
2983 if (vlan_tx_tag_present(skb)) {
2985 ret = deliver_skb(skb, pt_prev, orig_dev);
2988 if (vlan_hwaccel_do_receive(&skb)) {
2989 ret = __netif_receive_skb(skb);
2991 } else if (unlikely(!skb))
2996 * Make sure frames received on VLAN interfaces stacked on
2997 * bonding interfaces still make their way to any base bonding
2998 * device that may have registered for a specific ptype. The
2999 * handler may have to adjust skb->dev and orig_dev.
3001 orig_or_bond = orig_dev;
3002 if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
3003 (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
3004 orig_or_bond = vlan_dev_real_dev(skb->dev);
3007 type = skb->protocol;
3008 list_for_each_entry_rcu(ptype,
3009 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3010 if (ptype->type == type && (ptype->dev == null_or_orig ||
3011 ptype->dev == skb->dev || ptype->dev == orig_dev ||
3012 ptype->dev == orig_or_bond)) {
3014 ret = deliver_skb(skb, pt_prev, orig_dev);
3020 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3022 atomic_long_inc(&skb->dev->rx_dropped);
3024 /* Jamal, now you will not able to escape explaining
3025 * me how you were going to use this. :-)
3036 * netif_receive_skb - process receive buffer from network
3037 * @skb: buffer to process
3039 * netif_receive_skb() is the main receive data processing function.
3040 * It always succeeds. The buffer may be dropped during processing
3041 * for congestion control or by the protocol layers.
3043 * This function may only be called from softirq context and interrupts
3044 * should be enabled.
3046 * Return values (usually ignored):
3047 * NET_RX_SUCCESS: no congestion
3048 * NET_RX_DROP: packet was dropped
3050 int netif_receive_skb(struct sk_buff *skb)
3052 if (netdev_tstamp_prequeue)
3053 net_timestamp_check(skb);
3055 if (skb_defer_rx_timestamp(skb))
3056 return NET_RX_SUCCESS;
3060 struct rps_dev_flow voidflow, *rflow = &voidflow;
3065 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3068 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3072 ret = __netif_receive_skb(skb);
3078 return __netif_receive_skb(skb);
3081 EXPORT_SYMBOL(netif_receive_skb);
3083 /* Network device is going away, flush any packets still pending
3084 * Called with irqs disabled.
3086 static void flush_backlog(void *arg)
3088 struct net_device *dev = arg;
3089 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3090 struct sk_buff *skb, *tmp;
3093 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3094 if (skb->dev == dev) {
3095 __skb_unlink(skb, &sd->input_pkt_queue);
3097 input_queue_head_incr(sd);
3102 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3103 if (skb->dev == dev) {
3104 __skb_unlink(skb, &sd->process_queue);
3106 input_queue_head_incr(sd);
3111 static int napi_gro_complete(struct sk_buff *skb)
3113 struct packet_type *ptype;
3114 __be16 type = skb->protocol;
3115 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3118 if (NAPI_GRO_CB(skb)->count == 1) {
3119 skb_shinfo(skb)->gso_size = 0;
3124 list_for_each_entry_rcu(ptype, head, list) {
3125 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
3128 err = ptype->gro_complete(skb);
3134 WARN_ON(&ptype->list == head);
3136 return NET_RX_SUCCESS;
3140 return netif_receive_skb(skb);
3143 inline void napi_gro_flush(struct napi_struct *napi)
3145 struct sk_buff *skb, *next;
3147 for (skb = napi->gro_list; skb; skb = next) {
3150 napi_gro_complete(skb);
3153 napi->gro_count = 0;
3154 napi->gro_list = NULL;
3156 EXPORT_SYMBOL(napi_gro_flush);
3158 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3160 struct sk_buff **pp = NULL;
3161 struct packet_type *ptype;
3162 __be16 type = skb->protocol;
3163 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
3166 enum gro_result ret;
3168 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3171 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3175 list_for_each_entry_rcu(ptype, head, list) {
3176 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
3179 skb_set_network_header(skb, skb_gro_offset(skb));
3180 mac_len = skb->network_header - skb->mac_header;
3181 skb->mac_len = mac_len;
3182 NAPI_GRO_CB(skb)->same_flow = 0;
3183 NAPI_GRO_CB(skb)->flush = 0;
3184 NAPI_GRO_CB(skb)->free = 0;
3186 pp = ptype->gro_receive(&napi->gro_list, skb);
3191 if (&ptype->list == head)
3194 same_flow = NAPI_GRO_CB(skb)->same_flow;
3195 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3198 struct sk_buff *nskb = *pp;
3202 napi_gro_complete(nskb);
3209 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3213 NAPI_GRO_CB(skb)->count = 1;
3214 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3215 skb->next = napi->gro_list;
3216 napi->gro_list = skb;
3220 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3221 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3223 BUG_ON(skb->end - skb->tail < grow);
3225 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3228 skb->data_len -= grow;
3230 skb_shinfo(skb)->frags[0].page_offset += grow;
3231 skb_shinfo(skb)->frags[0].size -= grow;
3233 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
3234 put_page(skb_shinfo(skb)->frags[0].page);
3235 memmove(skb_shinfo(skb)->frags,
3236 skb_shinfo(skb)->frags + 1,
3237 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3248 EXPORT_SYMBOL(dev_gro_receive);
3250 static inline gro_result_t
3251 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3255 for (p = napi->gro_list; p; p = p->next) {
3256 unsigned long diffs;
3258 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3259 diffs |= p->vlan_tci ^ skb->vlan_tci;
3260 diffs |= compare_ether_header(skb_mac_header(p),
3261 skb_gro_mac_header(skb));
3262 NAPI_GRO_CB(p)->same_flow = !diffs;
3263 NAPI_GRO_CB(p)->flush = 0;
3266 return dev_gro_receive(napi, skb);
3269 gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3273 if (netif_receive_skb(skb))
3278 case GRO_MERGED_FREE:
3289 EXPORT_SYMBOL(napi_skb_finish);
3291 void skb_gro_reset_offset(struct sk_buff *skb)
3293 NAPI_GRO_CB(skb)->data_offset = 0;
3294 NAPI_GRO_CB(skb)->frag0 = NULL;
3295 NAPI_GRO_CB(skb)->frag0_len = 0;
3297 if (skb->mac_header == skb->tail &&
3298 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3299 NAPI_GRO_CB(skb)->frag0 =
3300 page_address(skb_shinfo(skb)->frags[0].page) +
3301 skb_shinfo(skb)->frags[0].page_offset;
3302 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
3305 EXPORT_SYMBOL(skb_gro_reset_offset);
3307 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3309 skb_gro_reset_offset(skb);
3311 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3313 EXPORT_SYMBOL(napi_gro_receive);
3315 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3317 __skb_pull(skb, skb_headlen(skb));
3318 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3324 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3326 struct sk_buff *skb = napi->skb;
3329 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3335 EXPORT_SYMBOL(napi_get_frags);
3337 gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3343 skb->protocol = eth_type_trans(skb, skb->dev);
3345 if (ret == GRO_HELD)
3346 skb_gro_pull(skb, -ETH_HLEN);
3347 else if (netif_receive_skb(skb))
3352 case GRO_MERGED_FREE:
3353 napi_reuse_skb(napi, skb);
3362 EXPORT_SYMBOL(napi_frags_finish);
3364 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3366 struct sk_buff *skb = napi->skb;
3373 skb_reset_mac_header(skb);
3374 skb_gro_reset_offset(skb);
3376 off = skb_gro_offset(skb);
3377 hlen = off + sizeof(*eth);
3378 eth = skb_gro_header_fast(skb, off);
3379 if (skb_gro_header_hard(skb, hlen)) {
3380 eth = skb_gro_header_slow(skb, hlen, off);
3381 if (unlikely(!eth)) {
3382 napi_reuse_skb(napi, skb);
3388 skb_gro_pull(skb, sizeof(*eth));
3391 * This works because the only protocols we care about don't require
3392 * special handling. We'll fix it up properly at the end.
3394 skb->protocol = eth->h_proto;
3399 EXPORT_SYMBOL(napi_frags_skb);
3401 gro_result_t napi_gro_frags(struct napi_struct *napi)
3403 struct sk_buff *skb = napi_frags_skb(napi);
3408 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
3410 EXPORT_SYMBOL(napi_gro_frags);
3413 * net_rps_action sends any pending IPI's for rps.
3414 * Note: called with local irq disabled, but exits with local irq enabled.
3416 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3419 struct softnet_data *remsd = sd->rps_ipi_list;
3422 sd->rps_ipi_list = NULL;
3426 /* Send pending IPI's to kick RPS processing on remote cpus. */
3428 struct softnet_data *next = remsd->rps_ipi_next;
3430 if (cpu_online(remsd->cpu))
3431 __smp_call_function_single(remsd->cpu,
3440 static int process_backlog(struct napi_struct *napi, int quota)
3443 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3446 /* Check if we have pending ipi, its better to send them now,
3447 * not waiting net_rx_action() end.
3449 if (sd->rps_ipi_list) {
3450 local_irq_disable();
3451 net_rps_action_and_irq_enable(sd);
3454 napi->weight = weight_p;
3455 local_irq_disable();
3456 while (work < quota) {
3457 struct sk_buff *skb;
3460 while ((skb = __skb_dequeue(&sd->process_queue))) {
3462 __netif_receive_skb(skb);
3463 local_irq_disable();
3464 input_queue_head_incr(sd);
3465 if (++work >= quota) {
3472 qlen = skb_queue_len(&sd->input_pkt_queue);
3474 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3475 &sd->process_queue);
3477 if (qlen < quota - work) {
3479 * Inline a custom version of __napi_complete().
3480 * only current cpu owns and manipulates this napi,
3481 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3482 * we can use a plain write instead of clear_bit(),
3483 * and we dont need an smp_mb() memory barrier.
3485 list_del(&napi->poll_list);
3488 quota = work + qlen;
3498 * __napi_schedule - schedule for receive
3499 * @n: entry to schedule
3501 * The entry's receive function will be scheduled to run
3503 void __napi_schedule(struct napi_struct *n)
3505 unsigned long flags;
3507 local_irq_save(flags);
3508 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3509 local_irq_restore(flags);
3511 EXPORT_SYMBOL(__napi_schedule);
3513 void __napi_complete(struct napi_struct *n)
3515 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3516 BUG_ON(n->gro_list);
3518 list_del(&n->poll_list);
3519 smp_mb__before_clear_bit();
3520 clear_bit(NAPI_STATE_SCHED, &n->state);
3522 EXPORT_SYMBOL(__napi_complete);
3524 void napi_complete(struct napi_struct *n)
3526 unsigned long flags;
3529 * don't let napi dequeue from the cpu poll list
3530 * just in case its running on a different cpu
3532 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3536 local_irq_save(flags);
3538 local_irq_restore(flags);
3540 EXPORT_SYMBOL(napi_complete);
3542 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
3543 int (*poll)(struct napi_struct *, int), int weight)
3545 INIT_LIST_HEAD(&napi->poll_list);
3546 napi->gro_count = 0;
3547 napi->gro_list = NULL;
3550 napi->weight = weight;
3551 list_add(&napi->dev_list, &dev->napi_list);
3553 #ifdef CONFIG_NETPOLL
3554 spin_lock_init(&napi->poll_lock);
3555 napi->poll_owner = -1;
3557 set_bit(NAPI_STATE_SCHED, &napi->state);
3559 EXPORT_SYMBOL(netif_napi_add);
3561 void netif_napi_del(struct napi_struct *napi)
3563 struct sk_buff *skb, *next;
3565 list_del_init(&napi->dev_list);
3566 napi_free_frags(napi);
3568 for (skb = napi->gro_list; skb; skb = next) {
3574 napi->gro_list = NULL;
3575 napi->gro_count = 0;
3577 EXPORT_SYMBOL(netif_napi_del);
3579 static void net_rx_action(struct softirq_action *h)
3581 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3582 unsigned long time_limit = jiffies + 2;
3583 int budget = netdev_budget;
3586 local_irq_disable();
3588 while (!list_empty(&sd->poll_list)) {
3589 struct napi_struct *n;
3592 /* If softirq window is exhuasted then punt.
3593 * Allow this to run for 2 jiffies since which will allow
3594 * an average latency of 1.5/HZ.
3596 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
3601 /* Even though interrupts have been re-enabled, this
3602 * access is safe because interrupts can only add new
3603 * entries to the tail of this list, and only ->poll()
3604 * calls can remove this head entry from the list.
3606 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
3608 have = netpoll_poll_lock(n);
3612 /* This NAPI_STATE_SCHED test is for avoiding a race
3613 * with netpoll's poll_napi(). Only the entity which
3614 * obtains the lock and sees NAPI_STATE_SCHED set will
3615 * actually make the ->poll() call. Therefore we avoid
3616 * accidently calling ->poll() when NAPI is not scheduled.
3619 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3620 work = n->poll(n, weight);
3624 WARN_ON_ONCE(work > weight);
3628 local_irq_disable();
3630 /* Drivers must not modify the NAPI state if they
3631 * consume the entire weight. In such cases this code
3632 * still "owns" the NAPI instance and therefore can
3633 * move the instance around on the list at-will.
3635 if (unlikely(work == weight)) {
3636 if (unlikely(napi_disable_pending(n))) {
3639 local_irq_disable();
3641 list_move_tail(&n->poll_list, &sd->poll_list);
3644 netpoll_poll_unlock(have);
3647 net_rps_action_and_irq_enable(sd);
3649 #ifdef CONFIG_NET_DMA
3651 * There may not be any more sk_buffs coming right now, so push
3652 * any pending DMA copies to hardware
3654 dma_issue_pending_all();
3661 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3665 static gifconf_func_t *gifconf_list[NPROTO];
3668 * register_gifconf - register a SIOCGIF handler
3669 * @family: Address family
3670 * @gifconf: Function handler
3672 * Register protocol dependent address dumping routines. The handler
3673 * that is passed must not be freed or reused until it has been replaced
3674 * by another handler.
3676 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
3678 if (family >= NPROTO)
3680 gifconf_list[family] = gifconf;
3683 EXPORT_SYMBOL(register_gifconf);
3687 * Map an interface index to its name (SIOCGIFNAME)
3691 * We need this ioctl for efficient implementation of the
3692 * if_indextoname() function required by the IPv6 API. Without
3693 * it, we would have to search all the interfaces to find a
3697 static int dev_ifname(struct net *net, struct ifreq __user *arg)
3699 struct net_device *dev;
3703 * Fetch the caller's info block.
3706 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3710 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
3716 strcpy(ifr.ifr_name, dev->name);
3719 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
3725 * Perform a SIOCGIFCONF call. This structure will change
3726 * size eventually, and there is nothing I can do about it.
3727 * Thus we will need a 'compatibility mode'.
3730 static int dev_ifconf(struct net *net, char __user *arg)
3733 struct net_device *dev;
3740 * Fetch the caller's info block.
3743 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3750 * Loop over the interfaces, and write an info block for each.
3754 for_each_netdev(net, dev) {
3755 for (i = 0; i < NPROTO; i++) {
3756 if (gifconf_list[i]) {
3759 done = gifconf_list[i](dev, NULL, 0);
3761 done = gifconf_list[i](dev, pos + total,
3771 * All done. Write the updated control block back to the caller.
3773 ifc.ifc_len = total;
3776 * Both BSD and Solaris return 0 here, so we do too.
3778 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3781 #ifdef CONFIG_PROC_FS
3783 * This is invoked by the /proc filesystem handler to display a device
3786 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3789 struct net *net = seq_file_net(seq);
3791 struct net_device *dev;
3795 return SEQ_START_TOKEN;
3798 for_each_netdev_rcu(net, dev)
3805 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3807 struct net_device *dev = (v == SEQ_START_TOKEN) ?
3808 first_net_device(seq_file_net(seq)) :
3809 next_net_device((struct net_device *)v);
3812 return rcu_dereference(dev);
3815 void dev_seq_stop(struct seq_file *seq, void *v)
3821 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3823 struct rtnl_link_stats64 temp;
3824 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
3826 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
3827 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
3828 dev->name, stats->rx_bytes, stats->rx_packets,
3830 stats->rx_dropped + stats->rx_missed_errors,
3831 stats->rx_fifo_errors,
3832 stats->rx_length_errors + stats->rx_over_errors +
3833 stats->rx_crc_errors + stats->rx_frame_errors,
3834 stats->rx_compressed, stats->multicast,
3835 stats->tx_bytes, stats->tx_packets,
3836 stats->tx_errors, stats->tx_dropped,
3837 stats->tx_fifo_errors, stats->collisions,
3838 stats->tx_carrier_errors +
3839 stats->tx_aborted_errors +
3840 stats->tx_window_errors +
3841 stats->tx_heartbeat_errors,
3842 stats->tx_compressed);
3846 * Called from the PROCfs module. This now uses the new arbitrary sized
3847 * /proc/net interface to create /proc/net/dev
3849 static int dev_seq_show(struct seq_file *seq, void *v)
3851 if (v == SEQ_START_TOKEN)
3852 seq_puts(seq, "Inter-| Receive "
3854 " face |bytes packets errs drop fifo frame "
3855 "compressed multicast|bytes packets errs "
3856 "drop fifo colls carrier compressed\n");
3858 dev_seq_printf_stats(seq, v);
3862 static struct softnet_data *softnet_get_online(loff_t *pos)
3864 struct softnet_data *sd = NULL;
3866 while (*pos < nr_cpu_ids)
3867 if (cpu_online(*pos)) {
3868 sd = &per_cpu(softnet_data, *pos);
3875 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3877 return softnet_get_online(pos);
3880 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3883 return softnet_get_online(pos);
3886 static void softnet_seq_stop(struct seq_file *seq, void *v)
3890 static int softnet_seq_show(struct seq_file *seq, void *v)
3892 struct softnet_data *sd = v;
3894 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3895 sd->processed, sd->dropped, sd->time_squeeze, 0,
3896 0, 0, 0, 0, /* was fastroute */
3897 sd->cpu_collision, sd->received_rps);
3901 static const struct seq_operations dev_seq_ops = {
3902 .start = dev_seq_start,
3903 .next = dev_seq_next,
3904 .stop = dev_seq_stop,
3905 .show = dev_seq_show,
3908 static int dev_seq_open(struct inode *inode, struct file *file)
3910 return seq_open_net(inode, file, &dev_seq_ops,
3911 sizeof(struct seq_net_private));
3914 static const struct file_operations dev_seq_fops = {
3915 .owner = THIS_MODULE,
3916 .open = dev_seq_open,
3918 .llseek = seq_lseek,
3919 .release = seq_release_net,
3922 static const struct seq_operations softnet_seq_ops = {
3923 .start = softnet_seq_start,
3924 .next = softnet_seq_next,
3925 .stop = softnet_seq_stop,
3926 .show = softnet_seq_show,
3929 static int softnet_seq_open(struct inode *inode, struct file *file)
3931 return seq_open(file, &softnet_seq_ops);
3934 static const struct file_operations softnet_seq_fops = {
3935 .owner = THIS_MODULE,
3936 .open = softnet_seq_open,
3938 .llseek = seq_lseek,
3939 .release = seq_release,
3942 static void *ptype_get_idx(loff_t pos)
3944 struct packet_type *pt = NULL;
3948 list_for_each_entry_rcu(pt, &ptype_all, list) {
3954 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3955 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3964 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3968 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3971 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3973 struct packet_type *pt;
3974 struct list_head *nxt;
3978 if (v == SEQ_START_TOKEN)
3979 return ptype_get_idx(0);
3982 nxt = pt->list.next;
3983 if (pt->type == htons(ETH_P_ALL)) {
3984 if (nxt != &ptype_all)
3987 nxt = ptype_base[0].next;
3989 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3991 while (nxt == &ptype_base[hash]) {
3992 if (++hash >= PTYPE_HASH_SIZE)
3994 nxt = ptype_base[hash].next;
3997 return list_entry(nxt, struct packet_type, list);
4000 static void ptype_seq_stop(struct seq_file *seq, void *v)
4006 static int ptype_seq_show(struct seq_file *seq, void *v)
4008 struct packet_type *pt = v;
4010 if (v == SEQ_START_TOKEN)
4011 seq_puts(seq, "Type Device Function\n");
4012 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4013 if (pt->type == htons(ETH_P_ALL))
4014 seq_puts(seq, "ALL ");
4016 seq_printf(seq, "%04x", ntohs(pt->type));
4018 seq_printf(seq, " %-8s %pF\n",
4019 pt->dev ? pt->dev->name : "", pt->func);
4025 static const struct seq_operations ptype_seq_ops = {
4026 .start = ptype_seq_start,
4027 .next = ptype_seq_next,
4028 .stop = ptype_seq_stop,
4029 .show = ptype_seq_show,
4032 static int ptype_seq_open(struct inode *inode, struct file *file)
4034 return seq_open_net(inode, file, &ptype_seq_ops,
4035 sizeof(struct seq_net_private));
4038 static const struct file_operations ptype_seq_fops = {
4039 .owner = THIS_MODULE,
4040 .open = ptype_seq_open,
4042 .llseek = seq_lseek,
4043 .release = seq_release_net,
4047 static int __net_init dev_proc_net_init(struct net *net)
4051 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4053 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4055 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4058 if (wext_proc_init(net))
4064 proc_net_remove(net, "ptype");
4066 proc_net_remove(net, "softnet_stat");
4068 proc_net_remove(net, "dev");
4072 static void __net_exit dev_proc_net_exit(struct net *net)
4074 wext_proc_exit(net);
4076 proc_net_remove(net, "ptype");
4077 proc_net_remove(net, "softnet_stat");
4078 proc_net_remove(net, "dev");
4081 static struct pernet_operations __net_initdata dev_proc_ops = {
4082 .init = dev_proc_net_init,
4083 .exit = dev_proc_net_exit,
4086 static int __init dev_proc_init(void)
4088 return register_pernet_subsys(&dev_proc_ops);
4091 #define dev_proc_init() 0
4092 #endif /* CONFIG_PROC_FS */
4096 * netdev_set_master - set up master/slave pair
4097 * @slave: slave device
4098 * @master: new master device
4100 * Changes the master device of the slave. Pass %NULL to break the
4101 * bonding. The caller must hold the RTNL semaphore. On a failure
4102 * a negative errno code is returned. On success the reference counts
4103 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
4104 * function returns zero.
4106 int netdev_set_master(struct net_device *slave, struct net_device *master)
4108 struct net_device *old = slave->master;
4118 slave->master = master;
4125 slave->flags |= IFF_SLAVE;
4127 slave->flags &= ~IFF_SLAVE;
4129 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
4132 EXPORT_SYMBOL(netdev_set_master);
4134 static void dev_change_rx_flags(struct net_device *dev, int flags)
4136 const struct net_device_ops *ops = dev->netdev_ops;
4138 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4139 ops->ndo_change_rx_flags(dev, flags);
4142 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4144 unsigned short old_flags = dev->flags;
4150 dev->flags |= IFF_PROMISC;
4151 dev->promiscuity += inc;
4152 if (dev->promiscuity == 0) {
4155 * If inc causes overflow, untouch promisc and return error.
4158 dev->flags &= ~IFF_PROMISC;
4160 dev->promiscuity -= inc;
4161 printk(KERN_WARNING "%s: promiscuity touches roof, "
4162 "set promiscuity failed, promiscuity feature "
4163 "of device might be broken.\n", dev->name);
4167 if (dev->flags != old_flags) {
4168 printk(KERN_INFO "device %s %s promiscuous mode\n",
4169 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4171 if (audit_enabled) {
4172 current_uid_gid(&uid, &gid);
4173 audit_log(current->audit_context, GFP_ATOMIC,
4174 AUDIT_ANOM_PROMISCUOUS,
4175 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4176 dev->name, (dev->flags & IFF_PROMISC),
4177 (old_flags & IFF_PROMISC),
4178 audit_get_loginuid(current),
4180 audit_get_sessionid(current));
4183 dev_change_rx_flags(dev, IFF_PROMISC);
4189 * dev_set_promiscuity - update promiscuity count on a device
4193 * Add or remove promiscuity from a device. While the count in the device
4194 * remains above zero the interface remains promiscuous. Once it hits zero
4195 * the device reverts back to normal filtering operation. A negative inc
4196 * value is used to drop promiscuity on the device.
4197 * Return 0 if successful or a negative errno code on error.
4199 int dev_set_promiscuity(struct net_device *dev, int inc)
4201 unsigned short old_flags = dev->flags;
4204 err = __dev_set_promiscuity(dev, inc);
4207 if (dev->flags != old_flags)
4208 dev_set_rx_mode(dev);
4211 EXPORT_SYMBOL(dev_set_promiscuity);
4214 * dev_set_allmulti - update allmulti count on a device
4218 * Add or remove reception of all multicast frames to a device. While the
4219 * count in the device remains above zero the interface remains listening
4220 * to all interfaces. Once it hits zero the device reverts back to normal
4221 * filtering operation. A negative @inc value is used to drop the counter
4222 * when releasing a resource needing all multicasts.
4223 * Return 0 if successful or a negative errno code on error.
4226 int dev_set_allmulti(struct net_device *dev, int inc)
4228 unsigned short old_flags = dev->flags;
4232 dev->flags |= IFF_ALLMULTI;
4233 dev->allmulti += inc;
4234 if (dev->allmulti == 0) {
4237 * If inc causes overflow, untouch allmulti and return error.
4240 dev->flags &= ~IFF_ALLMULTI;
4242 dev->allmulti -= inc;
4243 printk(KERN_WARNING "%s: allmulti touches roof, "
4244 "set allmulti failed, allmulti feature of "
4245 "device might be broken.\n", dev->name);
4249 if (dev->flags ^ old_flags) {
4250 dev_change_rx_flags(dev, IFF_ALLMULTI);
4251 dev_set_rx_mode(dev);
4255 EXPORT_SYMBOL(dev_set_allmulti);
4258 * Upload unicast and multicast address lists to device and
4259 * configure RX filtering. When the device doesn't support unicast
4260 * filtering it is put in promiscuous mode while unicast addresses
4263 void __dev_set_rx_mode(struct net_device *dev)
4265 const struct net_device_ops *ops = dev->netdev_ops;
4267 /* dev_open will call this function so the list will stay sane. */
4268 if (!(dev->flags&IFF_UP))
4271 if (!netif_device_present(dev))
4274 if (ops->ndo_set_rx_mode)
4275 ops->ndo_set_rx_mode(dev);
4277 /* Unicast addresses changes may only happen under the rtnl,
4278 * therefore calling __dev_set_promiscuity here is safe.
4280 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4281 __dev_set_promiscuity(dev, 1);
4282 dev->uc_promisc = 1;
4283 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4284 __dev_set_promiscuity(dev, -1);
4285 dev->uc_promisc = 0;
4288 if (ops->ndo_set_multicast_list)
4289 ops->ndo_set_multicast_list(dev);
4293 void dev_set_rx_mode(struct net_device *dev)
4295 netif_addr_lock_bh(dev);
4296 __dev_set_rx_mode(dev);
4297 netif_addr_unlock_bh(dev);
4301 * dev_get_flags - get flags reported to userspace
4304 * Get the combination of flag bits exported through APIs to userspace.
4306 unsigned dev_get_flags(const struct net_device *dev)
4310 flags = (dev->flags & ~(IFF_PROMISC |
4315 (dev->gflags & (IFF_PROMISC |
4318 if (netif_running(dev)) {
4319 if (netif_oper_up(dev))
4320 flags |= IFF_RUNNING;
4321 if (netif_carrier_ok(dev))
4322 flags |= IFF_LOWER_UP;
4323 if (netif_dormant(dev))
4324 flags |= IFF_DORMANT;
4329 EXPORT_SYMBOL(dev_get_flags);
4331 int __dev_change_flags(struct net_device *dev, unsigned int flags)
4333 int old_flags = dev->flags;
4339 * Set the flags on our device.
4342 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4343 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4345 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4349 * Load in the correct multicast list now the flags have changed.
4352 if ((old_flags ^ flags) & IFF_MULTICAST)
4353 dev_change_rx_flags(dev, IFF_MULTICAST);
4355 dev_set_rx_mode(dev);
4358 * Have we downed the interface. We handle IFF_UP ourselves
4359 * according to user attempts to set it, rather than blindly
4364 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4365 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
4368 dev_set_rx_mode(dev);
4371 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4372 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4374 dev->gflags ^= IFF_PROMISC;
4375 dev_set_promiscuity(dev, inc);
4378 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4379 is important. Some (broken) drivers set IFF_PROMISC, when
4380 IFF_ALLMULTI is requested not asking us and not reporting.
4382 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4383 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4385 dev->gflags ^= IFF_ALLMULTI;
4386 dev_set_allmulti(dev, inc);
4392 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
4394 unsigned int changes = dev->flags ^ old_flags;
4396 if (changes & IFF_UP) {
4397 if (dev->flags & IFF_UP)
4398 call_netdevice_notifiers(NETDEV_UP, dev);
4400 call_netdevice_notifiers(NETDEV_DOWN, dev);
4403 if (dev->flags & IFF_UP &&
4404 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
4405 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4409 * dev_change_flags - change device settings
4411 * @flags: device state flags
4413 * Change settings on device based state flags. The flags are
4414 * in the userspace exported format.
4416 int dev_change_flags(struct net_device *dev, unsigned flags)
4419 int old_flags = dev->flags;
4421 ret = __dev_change_flags(dev, flags);
4425 changes = old_flags ^ dev->flags;
4427 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4429 __dev_notify_flags(dev, old_flags);
4432 EXPORT_SYMBOL(dev_change_flags);
4435 * dev_set_mtu - Change maximum transfer unit
4437 * @new_mtu: new transfer unit
4439 * Change the maximum transfer size of the network device.
4441 int dev_set_mtu(struct net_device *dev, int new_mtu)
4443 const struct net_device_ops *ops = dev->netdev_ops;
4446 if (new_mtu == dev->mtu)
4449 /* MTU must be positive. */
4453 if (!netif_device_present(dev))
4457 if (ops->ndo_change_mtu)
4458 err = ops->ndo_change_mtu(dev, new_mtu);
4462 if (!err && dev->flags & IFF_UP)
4463 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4466 EXPORT_SYMBOL(dev_set_mtu);
4469 * dev_set_mac_address - Change Media Access Control Address
4473 * Change the hardware (MAC) address of the device
4475 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4477 const struct net_device_ops *ops = dev->netdev_ops;
4480 if (!ops->ndo_set_mac_address)
4482 if (sa->sa_family != dev->type)
4484 if (!netif_device_present(dev))
4486 err = ops->ndo_set_mac_address(dev, sa);
4488 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4491 EXPORT_SYMBOL(dev_set_mac_address);
4494 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4496 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4499 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
4505 case SIOCGIFFLAGS: /* Get interface flags */
4506 ifr->ifr_flags = (short) dev_get_flags(dev);
4509 case SIOCGIFMETRIC: /* Get the metric on the interface
4510 (currently unused) */
4511 ifr->ifr_metric = 0;
4514 case SIOCGIFMTU: /* Get the MTU of a device */
4515 ifr->ifr_mtu = dev->mtu;
4520 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4522 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4523 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4524 ifr->ifr_hwaddr.sa_family = dev->type;
4532 ifr->ifr_map.mem_start = dev->mem_start;
4533 ifr->ifr_map.mem_end = dev->mem_end;
4534 ifr->ifr_map.base_addr = dev->base_addr;
4535 ifr->ifr_map.irq = dev->irq;
4536 ifr->ifr_map.dma = dev->dma;
4537 ifr->ifr_map.port = dev->if_port;
4541 ifr->ifr_ifindex = dev->ifindex;
4545 ifr->ifr_qlen = dev->tx_queue_len;
4549 /* dev_ioctl() should ensure this case
4561 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4563 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4566 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4567 const struct net_device_ops *ops;
4572 ops = dev->netdev_ops;
4575 case SIOCSIFFLAGS: /* Set interface flags */
4576 return dev_change_flags(dev, ifr->ifr_flags);
4578 case SIOCSIFMETRIC: /* Set the metric on the interface
4579 (currently unused) */
4582 case SIOCSIFMTU: /* Set the MTU of a device */
4583 return dev_set_mtu(dev, ifr->ifr_mtu);
4586 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4588 case SIOCSIFHWBROADCAST:
4589 if (ifr->ifr_hwaddr.sa_family != dev->type)
4591 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4592 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4593 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4597 if (ops->ndo_set_config) {
4598 if (!netif_device_present(dev))
4600 return ops->ndo_set_config(dev, &ifr->ifr_map);
4605 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4606 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4608 if (!netif_device_present(dev))
4610 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
4613 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4614 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4616 if (!netif_device_present(dev))
4618 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
4621 if (ifr->ifr_qlen < 0)
4623 dev->tx_queue_len = ifr->ifr_qlen;
4627 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4628 return dev_change_name(dev, ifr->ifr_newname);
4631 * Unknown or private ioctl
4634 if ((cmd >= SIOCDEVPRIVATE &&
4635 cmd <= SIOCDEVPRIVATE + 15) ||
4636 cmd == SIOCBONDENSLAVE ||
4637 cmd == SIOCBONDRELEASE ||
4638 cmd == SIOCBONDSETHWADDR ||
4639 cmd == SIOCBONDSLAVEINFOQUERY ||
4640 cmd == SIOCBONDINFOQUERY ||
4641 cmd == SIOCBONDCHANGEACTIVE ||
4642 cmd == SIOCGMIIPHY ||
4643 cmd == SIOCGMIIREG ||
4644 cmd == SIOCSMIIREG ||
4645 cmd == SIOCBRADDIF ||
4646 cmd == SIOCBRDELIF ||
4647 cmd == SIOCSHWTSTAMP ||
4648 cmd == SIOCWANDEV) {
4650 if (ops->ndo_do_ioctl) {
4651 if (netif_device_present(dev))
4652 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4664 * This function handles all "interface"-type I/O control requests. The actual
4665 * 'doing' part of this is dev_ifsioc above.
4669 * dev_ioctl - network device ioctl
4670 * @net: the applicable net namespace
4671 * @cmd: command to issue
4672 * @arg: pointer to a struct ifreq in user space
4674 * Issue ioctl functions to devices. This is normally called by the
4675 * user space syscall interfaces but can sometimes be useful for
4676 * other purposes. The return value is the return from the syscall if
4677 * positive or a negative errno code on error.
4680 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4686 /* One special case: SIOCGIFCONF takes ifconf argument
4687 and requires shared lock, because it sleeps writing
4691 if (cmd == SIOCGIFCONF) {
4693 ret = dev_ifconf(net, (char __user *) arg);
4697 if (cmd == SIOCGIFNAME)
4698 return dev_ifname(net, (struct ifreq __user *)arg);
4700 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4703 ifr.ifr_name[IFNAMSIZ-1] = 0;
4705 colon = strchr(ifr.ifr_name, ':');
4710 * See which interface the caller is talking about.
4715 * These ioctl calls:
4716 * - can be done by all.
4717 * - atomic and do not require locking.
4728 dev_load(net, ifr.ifr_name);
4730 ret = dev_ifsioc_locked(net, &ifr, cmd);
4735 if (copy_to_user(arg, &ifr,
4736 sizeof(struct ifreq)))
4742 dev_load(net, ifr.ifr_name);
4744 ret = dev_ethtool(net, &ifr);
4749 if (copy_to_user(arg, &ifr,
4750 sizeof(struct ifreq)))
4756 * These ioctl calls:
4757 * - require superuser power.
4758 * - require strict serialization.
4764 if (!capable(CAP_NET_ADMIN))
4766 dev_load(net, ifr.ifr_name);
4768 ret = dev_ifsioc(net, &ifr, cmd);
4773 if (copy_to_user(arg, &ifr,
4774 sizeof(struct ifreq)))
4780 * These ioctl calls:
4781 * - require superuser power.
4782 * - require strict serialization.
4783 * - do not return a value
4793 case SIOCSIFHWBROADCAST:
4796 case SIOCBONDENSLAVE:
4797 case SIOCBONDRELEASE:
4798 case SIOCBONDSETHWADDR:
4799 case SIOCBONDCHANGEACTIVE:
4803 if (!capable(CAP_NET_ADMIN))
4806 case SIOCBONDSLAVEINFOQUERY:
4807 case SIOCBONDINFOQUERY:
4808 dev_load(net, ifr.ifr_name);
4810 ret = dev_ifsioc(net, &ifr, cmd);
4815 /* Get the per device memory space. We can add this but
4816 * currently do not support it */
4818 /* Set the per device memory buffer space.
4819 * Not applicable in our case */
4824 * Unknown or private ioctl.
4827 if (cmd == SIOCWANDEV ||
4828 (cmd >= SIOCDEVPRIVATE &&
4829 cmd <= SIOCDEVPRIVATE + 15)) {
4830 dev_load(net, ifr.ifr_name);
4832 ret = dev_ifsioc(net, &ifr, cmd);
4834 if (!ret && copy_to_user(arg, &ifr,
4835 sizeof(struct ifreq)))
4839 /* Take care of Wireless Extensions */
4840 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4841 return wext_handle_ioctl(net, &ifr, cmd, arg);
4848 * dev_new_index - allocate an ifindex
4849 * @net: the applicable net namespace
4851 * Returns a suitable unique value for a new device interface
4852 * number. The caller must hold the rtnl semaphore or the
4853 * dev_base_lock to be sure it remains unique.
4855 static int dev_new_index(struct net *net)
4861 if (!__dev_get_by_index(net, ifindex))
4866 /* Delayed registration/unregisteration */
4867 static LIST_HEAD(net_todo_list);
4869 static void net_set_todo(struct net_device *dev)
4871 list_add_tail(&dev->todo_list, &net_todo_list);
4874 static void rollback_registered_many(struct list_head *head)
4876 struct net_device *dev, *tmp;
4878 BUG_ON(dev_boot_phase);
4881 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4882 /* Some devices call without registering
4883 * for initialization unwind. Remove those
4884 * devices and proceed with the remaining.
4886 if (dev->reg_state == NETREG_UNINITIALIZED) {
4887 pr_debug("unregister_netdevice: device %s/%p never "
4888 "was registered\n", dev->name, dev);
4891 list_del(&dev->unreg_list);
4895 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4897 /* If device is running, close it first. */
4900 /* And unlink it from device chain. */
4901 unlist_netdevice(dev);
4903 dev->reg_state = NETREG_UNREGISTERING;
4908 list_for_each_entry(dev, head, unreg_list) {
4909 /* Shutdown queueing discipline. */
4913 /* Notify protocols, that we are about to destroy
4914 this device. They should clean all the things.
4916 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4918 if (!dev->rtnl_link_ops ||
4919 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
4920 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
4923 * Flush the unicast and multicast chains
4928 if (dev->netdev_ops->ndo_uninit)
4929 dev->netdev_ops->ndo_uninit(dev);
4931 /* Notifier chain MUST detach us from master device. */
4932 WARN_ON(dev->master);
4934 /* Remove entries from kobject tree */
4935 netdev_unregister_kobject(dev);
4938 /* Process any work delayed until the end of the batch */
4939 dev = list_first_entry(head, struct net_device, unreg_list);
4940 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4944 list_for_each_entry(dev, head, unreg_list)
4948 static void rollback_registered(struct net_device *dev)
4952 list_add(&dev->unreg_list, &single);
4953 rollback_registered_many(&single);
4956 unsigned long netdev_fix_features(unsigned long features, const char *name)
4958 /* Fix illegal SG+CSUM combinations. */
4959 if ((features & NETIF_F_SG) &&
4960 !(features & NETIF_F_ALL_CSUM)) {
4962 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4963 "checksum feature.\n", name);
4964 features &= ~NETIF_F_SG;
4967 /* TSO requires that SG is present as well. */
4968 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4970 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4971 "SG feature.\n", name);
4972 features &= ~NETIF_F_TSO;
4975 if (features & NETIF_F_UFO) {
4976 if (!(features & NETIF_F_GEN_CSUM)) {
4978 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4979 "since no NETIF_F_HW_CSUM feature.\n",
4981 features &= ~NETIF_F_UFO;
4984 if (!(features & NETIF_F_SG)) {
4986 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4987 "since no NETIF_F_SG feature.\n", name);
4988 features &= ~NETIF_F_UFO;
4994 EXPORT_SYMBOL(netdev_fix_features);
4997 * netif_stacked_transfer_operstate - transfer operstate
4998 * @rootdev: the root or lower level device to transfer state from
4999 * @dev: the device to transfer operstate to
5001 * Transfer operational state from root to device. This is normally
5002 * called when a stacking relationship exists between the root
5003 * device and the device(a leaf device).
5005 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5006 struct net_device *dev)
5008 if (rootdev->operstate == IF_OPER_DORMANT)
5009 netif_dormant_on(dev);
5011 netif_dormant_off(dev);
5013 if (netif_carrier_ok(rootdev)) {
5014 if (!netif_carrier_ok(dev))
5015 netif_carrier_on(dev);
5017 if (netif_carrier_ok(dev))
5018 netif_carrier_off(dev);
5021 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5023 static int netif_alloc_rx_queues(struct net_device *dev)
5026 unsigned int i, count = dev->num_rx_queues;
5027 struct netdev_rx_queue *rx;
5031 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5033 pr_err("netdev: Unable to allocate %u rx queues.\n", count);
5039 * Set a pointer to first element in the array which holds the
5042 for (i = 0; i < count; i++)
5048 static int netif_alloc_netdev_queues(struct net_device *dev)
5050 unsigned int count = dev->num_tx_queues;
5051 struct netdev_queue *tx;
5055 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5057 pr_err("netdev: Unable to allocate %u tx queues.\n",
5065 static void netdev_init_one_queue(struct net_device *dev,
5066 struct netdev_queue *queue,
5071 /* Initialize queue lock */
5072 spin_lock_init(&queue->_xmit_lock);
5073 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5074 queue->xmit_lock_owner = -1;
5077 static void netdev_init_queues(struct net_device *dev)
5079 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5080 spin_lock_init(&dev->tx_global_lock);
5084 * register_netdevice - register a network device
5085 * @dev: device to register
5087 * Take a completed network device structure and add it to the kernel
5088 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5089 * chain. 0 is returned on success. A negative errno code is returned
5090 * on a failure to set up the device, or if the name is a duplicate.
5092 * Callers must hold the rtnl semaphore. You may want
5093 * register_netdev() instead of this.
5096 * The locking appears insufficient to guarantee two parallel registers
5097 * will not get the same name.
5100 int register_netdevice(struct net_device *dev)
5103 struct net *net = dev_net(dev);
5105 BUG_ON(dev_boot_phase);
5110 /* When net_device's are persistent, this will be fatal. */
5111 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5114 spin_lock_init(&dev->addr_list_lock);
5115 netdev_set_addr_lockdep_class(dev);
5119 ret = netif_alloc_rx_queues(dev);
5123 ret = netif_alloc_netdev_queues(dev);
5127 netdev_init_queues(dev);
5129 /* Init, if this function is available */
5130 if (dev->netdev_ops->ndo_init) {
5131 ret = dev->netdev_ops->ndo_init(dev);
5139 ret = dev_get_valid_name(dev, dev->name, 0);
5143 dev->ifindex = dev_new_index(net);
5144 if (dev->iflink == -1)
5145 dev->iflink = dev->ifindex;
5147 /* Fix illegal checksum combinations */
5148 if ((dev->features & NETIF_F_HW_CSUM) &&
5149 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5150 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
5152 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5155 if ((dev->features & NETIF_F_NO_CSUM) &&
5156 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5157 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
5159 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
5162 dev->features = netdev_fix_features(dev->features, dev->name);
5164 /* Enable software GSO if SG is supported. */
5165 if (dev->features & NETIF_F_SG)
5166 dev->features |= NETIF_F_GSO;
5168 /* Enable GRO and NETIF_F_HIGHDMA for vlans by default,
5169 * vlan_dev_init() will do the dev->features check, so these features
5170 * are enabled only if supported by underlying device.
5172 dev->vlan_features |= (NETIF_F_GRO | NETIF_F_HIGHDMA);
5174 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5175 ret = notifier_to_errno(ret);
5179 ret = netdev_register_kobject(dev);
5182 dev->reg_state = NETREG_REGISTERED;
5185 * Default initial state at registry is that the
5186 * device is present.
5189 set_bit(__LINK_STATE_PRESENT, &dev->state);
5191 dev_init_scheduler(dev);
5193 list_netdevice(dev);
5195 /* Notify protocols, that a new device appeared. */
5196 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5197 ret = notifier_to_errno(ret);
5199 rollback_registered(dev);
5200 dev->reg_state = NETREG_UNREGISTERED;
5203 * Prevent userspace races by waiting until the network
5204 * device is fully setup before sending notifications.
5206 if (!dev->rtnl_link_ops ||
5207 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5208 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5214 if (dev->netdev_ops->ndo_uninit)
5215 dev->netdev_ops->ndo_uninit(dev);
5218 EXPORT_SYMBOL(register_netdevice);
5221 * init_dummy_netdev - init a dummy network device for NAPI
5222 * @dev: device to init
5224 * This takes a network device structure and initialize the minimum
5225 * amount of fields so it can be used to schedule NAPI polls without
5226 * registering a full blown interface. This is to be used by drivers
5227 * that need to tie several hardware interfaces to a single NAPI
5228 * poll scheduler due to HW limitations.
5230 int init_dummy_netdev(struct net_device *dev)
5232 /* Clear everything. Note we don't initialize spinlocks
5233 * are they aren't supposed to be taken by any of the
5234 * NAPI code and this dummy netdev is supposed to be
5235 * only ever used for NAPI polls
5237 memset(dev, 0, sizeof(struct net_device));
5239 /* make sure we BUG if trying to hit standard
5240 * register/unregister code path
5242 dev->reg_state = NETREG_DUMMY;
5244 /* NAPI wants this */
5245 INIT_LIST_HEAD(&dev->napi_list);
5247 /* a dummy interface is started by default */
5248 set_bit(__LINK_STATE_PRESENT, &dev->state);
5249 set_bit(__LINK_STATE_START, &dev->state);
5251 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5252 * because users of this 'device' dont need to change
5258 EXPORT_SYMBOL_GPL(init_dummy_netdev);
5262 * register_netdev - register a network device
5263 * @dev: device to register
5265 * Take a completed network device structure and add it to the kernel
5266 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5267 * chain. 0 is returned on success. A negative errno code is returned
5268 * on a failure to set up the device, or if the name is a duplicate.
5270 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5271 * and expands the device name if you passed a format string to
5274 int register_netdev(struct net_device *dev)
5281 * If the name is a format string the caller wants us to do a
5284 if (strchr(dev->name, '%')) {
5285 err = dev_alloc_name(dev, dev->name);
5290 err = register_netdevice(dev);
5295 EXPORT_SYMBOL(register_netdev);
5297 int netdev_refcnt_read(const struct net_device *dev)
5301 for_each_possible_cpu(i)
5302 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
5305 EXPORT_SYMBOL(netdev_refcnt_read);
5308 * netdev_wait_allrefs - wait until all references are gone.
5310 * This is called when unregistering network devices.
5312 * Any protocol or device that holds a reference should register
5313 * for netdevice notification, and cleanup and put back the
5314 * reference if they receive an UNREGISTER event.
5315 * We can get stuck here if buggy protocols don't correctly
5318 static void netdev_wait_allrefs(struct net_device *dev)
5320 unsigned long rebroadcast_time, warning_time;
5323 linkwatch_forget_dev(dev);
5325 rebroadcast_time = warning_time = jiffies;
5326 refcnt = netdev_refcnt_read(dev);
5328 while (refcnt != 0) {
5329 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5332 /* Rebroadcast unregister notification */
5333 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5334 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5335 * should have already handle it the first time */
5337 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5339 /* We must not have linkwatch events
5340 * pending on unregister. If this
5341 * happens, we simply run the queue
5342 * unscheduled, resulting in a noop
5345 linkwatch_run_queue();
5350 rebroadcast_time = jiffies;
5355 refcnt = netdev_refcnt_read(dev);
5357 if (time_after(jiffies, warning_time + 10 * HZ)) {
5358 printk(KERN_EMERG "unregister_netdevice: "
5359 "waiting for %s to become free. Usage "
5362 warning_time = jiffies;
5371 * register_netdevice(x1);
5372 * register_netdevice(x2);
5374 * unregister_netdevice(y1);
5375 * unregister_netdevice(y2);
5381 * We are invoked by rtnl_unlock().
5382 * This allows us to deal with problems:
5383 * 1) We can delete sysfs objects which invoke hotplug
5384 * without deadlocking with linkwatch via keventd.
5385 * 2) Since we run with the RTNL semaphore not held, we can sleep
5386 * safely in order to wait for the netdev refcnt to drop to zero.
5388 * We must not return until all unregister events added during
5389 * the interval the lock was held have been completed.
5391 void netdev_run_todo(void)
5393 struct list_head list;
5395 /* Snapshot list, allow later requests */
5396 list_replace_init(&net_todo_list, &list);
5400 while (!list_empty(&list)) {
5401 struct net_device *dev
5402 = list_first_entry(&list, struct net_device, todo_list);
5403 list_del(&dev->todo_list);
5405 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5406 printk(KERN_ERR "network todo '%s' but state %d\n",
5407 dev->name, dev->reg_state);
5412 dev->reg_state = NETREG_UNREGISTERED;
5414 on_each_cpu(flush_backlog, dev, 1);
5416 netdev_wait_allrefs(dev);
5419 BUG_ON(netdev_refcnt_read(dev));
5420 WARN_ON(rcu_dereference_raw(dev->ip_ptr));
5421 WARN_ON(rcu_dereference_raw(dev->ip6_ptr));
5422 WARN_ON(dev->dn_ptr);
5424 if (dev->destructor)
5425 dev->destructor(dev);
5427 /* Free network device */
5428 kobject_put(&dev->dev.kobj);
5433 * dev_txq_stats_fold - fold tx_queues stats
5434 * @dev: device to get statistics from
5435 * @stats: struct rtnl_link_stats64 to hold results
5437 void dev_txq_stats_fold(const struct net_device *dev,
5438 struct rtnl_link_stats64 *stats)
5440 u64 tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5442 struct netdev_queue *txq;
5444 for (i = 0; i < dev->num_tx_queues; i++) {
5445 txq = netdev_get_tx_queue(dev, i);
5446 spin_lock_bh(&txq->_xmit_lock);
5447 tx_bytes += txq->tx_bytes;
5448 tx_packets += txq->tx_packets;
5449 tx_dropped += txq->tx_dropped;
5450 spin_unlock_bh(&txq->_xmit_lock);
5452 if (tx_bytes || tx_packets || tx_dropped) {
5453 stats->tx_bytes = tx_bytes;
5454 stats->tx_packets = tx_packets;
5455 stats->tx_dropped = tx_dropped;
5458 EXPORT_SYMBOL(dev_txq_stats_fold);
5460 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5461 * fields in the same order, with only the type differing.
5463 static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
5464 const struct net_device_stats *netdev_stats)
5466 #if BITS_PER_LONG == 64
5467 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
5468 memcpy(stats64, netdev_stats, sizeof(*stats64));
5470 size_t i, n = sizeof(*stats64) / sizeof(u64);
5471 const unsigned long *src = (const unsigned long *)netdev_stats;
5472 u64 *dst = (u64 *)stats64;
5474 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
5475 sizeof(*stats64) / sizeof(u64));
5476 for (i = 0; i < n; i++)
5482 * dev_get_stats - get network device statistics
5483 * @dev: device to get statistics from
5484 * @storage: place to store stats
5486 * Get network statistics from device. Return @storage.
5487 * The device driver may provide its own method by setting
5488 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5489 * otherwise the internal statistics structure is used.
5491 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
5492 struct rtnl_link_stats64 *storage)
5494 const struct net_device_ops *ops = dev->netdev_ops;
5496 if (ops->ndo_get_stats64) {
5497 memset(storage, 0, sizeof(*storage));
5498 ops->ndo_get_stats64(dev, storage);
5499 } else if (ops->ndo_get_stats) {
5500 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5502 netdev_stats_to_stats64(storage, &dev->stats);
5503 dev_txq_stats_fold(dev, storage);
5505 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5508 EXPORT_SYMBOL(dev_get_stats);
5510 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5512 struct netdev_queue *queue = dev_ingress_queue(dev);
5514 #ifdef CONFIG_NET_CLS_ACT
5517 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
5520 netdev_init_one_queue(dev, queue, NULL);
5521 queue->qdisc = &noop_qdisc;
5522 queue->qdisc_sleeping = &noop_qdisc;
5523 rcu_assign_pointer(dev->ingress_queue, queue);
5529 * alloc_netdev_mq - allocate network device
5530 * @sizeof_priv: size of private data to allocate space for
5531 * @name: device name format string
5532 * @setup: callback to initialize device
5533 * @queue_count: the number of subqueues to allocate
5535 * Allocates a struct net_device with private data area for driver use
5536 * and performs basic initialization. Also allocates subquue structs
5537 * for each queue on the device at the end of the netdevice.
5539 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5540 void (*setup)(struct net_device *), unsigned int queue_count)
5542 struct net_device *dev;
5544 struct net_device *p;
5546 BUG_ON(strlen(name) >= sizeof(dev->name));
5548 if (queue_count < 1) {
5549 pr_err("alloc_netdev: Unable to allocate device "
5550 "with zero queues.\n");
5554 alloc_size = sizeof(struct net_device);
5556 /* ensure 32-byte alignment of private area */
5557 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5558 alloc_size += sizeof_priv;
5560 /* ensure 32-byte alignment of whole construct */
5561 alloc_size += NETDEV_ALIGN - 1;
5563 p = kzalloc(alloc_size, GFP_KERNEL);
5565 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5569 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5570 dev->padded = (char *)dev - (char *)p;
5572 dev->pcpu_refcnt = alloc_percpu(int);
5573 if (!dev->pcpu_refcnt)
5576 if (dev_addr_init(dev))
5582 dev_net_set(dev, &init_net);
5584 dev->num_tx_queues = queue_count;
5585 dev->real_num_tx_queues = queue_count;
5588 dev->num_rx_queues = queue_count;
5589 dev->real_num_rx_queues = queue_count;
5592 dev->gso_max_size = GSO_MAX_SIZE;
5594 INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
5595 dev->ethtool_ntuple_list.count = 0;
5596 INIT_LIST_HEAD(&dev->napi_list);
5597 INIT_LIST_HEAD(&dev->unreg_list);
5598 INIT_LIST_HEAD(&dev->link_watch_list);
5599 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5601 strcpy(dev->name, name);
5605 free_percpu(dev->pcpu_refcnt);
5610 EXPORT_SYMBOL(alloc_netdev_mq);
5613 * free_netdev - free network device
5616 * This function does the last stage of destroying an allocated device
5617 * interface. The reference to the device object is released.
5618 * If this is the last reference then it will be freed.
5620 void free_netdev(struct net_device *dev)
5622 struct napi_struct *p, *n;
5624 release_net(dev_net(dev));
5628 kfree(rcu_dereference_raw(dev->ingress_queue));
5630 /* Flush device addresses */
5631 dev_addr_flush(dev);
5633 /* Clear ethtool n-tuple list */
5634 ethtool_ntuple_flush(dev);
5636 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5639 free_percpu(dev->pcpu_refcnt);
5640 dev->pcpu_refcnt = NULL;
5642 /* Compatibility with error handling in drivers */
5643 if (dev->reg_state == NETREG_UNINITIALIZED) {
5644 kfree((char *)dev - dev->padded);
5648 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5649 dev->reg_state = NETREG_RELEASED;
5651 /* will free via device release */
5652 put_device(&dev->dev);
5654 EXPORT_SYMBOL(free_netdev);
5657 * synchronize_net - Synchronize with packet receive processing
5659 * Wait for packets currently being received to be done.
5660 * Does not block later packets from starting.
5662 void synchronize_net(void)
5667 EXPORT_SYMBOL(synchronize_net);
5670 * unregister_netdevice_queue - remove device from the kernel
5674 * This function shuts down a device interface and removes it
5675 * from the kernel tables.
5676 * If head not NULL, device is queued to be unregistered later.
5678 * Callers must hold the rtnl semaphore. You may want
5679 * unregister_netdev() instead of this.
5682 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5687 list_move_tail(&dev->unreg_list, head);
5689 rollback_registered(dev);
5690 /* Finish processing unregister after unlock */
5694 EXPORT_SYMBOL(unregister_netdevice_queue);
5697 * unregister_netdevice_many - unregister many devices
5698 * @head: list of devices
5700 void unregister_netdevice_many(struct list_head *head)
5702 struct net_device *dev;
5704 if (!list_empty(head)) {
5705 rollback_registered_many(head);
5706 list_for_each_entry(dev, head, unreg_list)
5710 EXPORT_SYMBOL(unregister_netdevice_many);
5713 * unregister_netdev - remove device from the kernel
5716 * This function shuts down a device interface and removes it
5717 * from the kernel tables.
5719 * This is just a wrapper for unregister_netdevice that takes
5720 * the rtnl semaphore. In general you want to use this and not
5721 * unregister_netdevice.
5723 void unregister_netdev(struct net_device *dev)
5726 unregister_netdevice(dev);
5729 EXPORT_SYMBOL(unregister_netdev);
5732 * dev_change_net_namespace - move device to different nethost namespace
5734 * @net: network namespace
5735 * @pat: If not NULL name pattern to try if the current device name
5736 * is already taken in the destination network namespace.
5738 * This function shuts down a device interface and moves it
5739 * to a new network namespace. On success 0 is returned, on
5740 * a failure a netagive errno code is returned.
5742 * Callers must hold the rtnl semaphore.
5745 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5751 /* Don't allow namespace local devices to be moved. */
5753 if (dev->features & NETIF_F_NETNS_LOCAL)
5756 /* Ensure the device has been registrered */
5758 if (dev->reg_state != NETREG_REGISTERED)
5761 /* Get out if there is nothing todo */
5763 if (net_eq(dev_net(dev), net))
5766 /* Pick the destination device name, and ensure
5767 * we can use it in the destination network namespace.
5770 if (__dev_get_by_name(net, dev->name)) {
5771 /* We get here if we can't use the current device name */
5774 if (dev_get_valid_name(dev, pat, 1))
5779 * And now a mini version of register_netdevice unregister_netdevice.
5782 /* If device is running close it first. */
5785 /* And unlink it from device chain */
5787 unlist_netdevice(dev);
5791 /* Shutdown queueing discipline. */
5794 /* Notify protocols, that we are about to destroy
5795 this device. They should clean all the things.
5797 Note that dev->reg_state stays at NETREG_REGISTERED.
5798 This is wanted because this way 8021q and macvlan know
5799 the device is just moving and can keep their slaves up.
5801 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5802 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5805 * Flush the unicast and multicast chains
5810 /* Actually switch the network namespace */
5811 dev_net_set(dev, net);
5813 /* If there is an ifindex conflict assign a new one */
5814 if (__dev_get_by_index(net, dev->ifindex)) {
5815 int iflink = (dev->iflink == dev->ifindex);
5816 dev->ifindex = dev_new_index(net);
5818 dev->iflink = dev->ifindex;
5821 /* Fixup kobjects */
5822 err = device_rename(&dev->dev, dev->name);
5825 /* Add the device back in the hashes */
5826 list_netdevice(dev);
5828 /* Notify protocols, that a new device appeared. */
5829 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5832 * Prevent userspace races by waiting until the network
5833 * device is fully setup before sending notifications.
5835 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
5842 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5844 static int dev_cpu_callback(struct notifier_block *nfb,
5845 unsigned long action,
5848 struct sk_buff **list_skb;
5849 struct sk_buff *skb;
5850 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5851 struct softnet_data *sd, *oldsd;
5853 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5856 local_irq_disable();
5857 cpu = smp_processor_id();
5858 sd = &per_cpu(softnet_data, cpu);
5859 oldsd = &per_cpu(softnet_data, oldcpu);
5861 /* Find end of our completion_queue. */
5862 list_skb = &sd->completion_queue;
5864 list_skb = &(*list_skb)->next;
5865 /* Append completion queue from offline CPU. */
5866 *list_skb = oldsd->completion_queue;
5867 oldsd->completion_queue = NULL;
5869 /* Append output queue from offline CPU. */
5870 if (oldsd->output_queue) {
5871 *sd->output_queue_tailp = oldsd->output_queue;
5872 sd->output_queue_tailp = oldsd->output_queue_tailp;
5873 oldsd->output_queue = NULL;
5874 oldsd->output_queue_tailp = &oldsd->output_queue;
5877 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5880 /* Process offline CPU's input_pkt_queue */
5881 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
5883 input_queue_head_incr(oldsd);
5885 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5887 input_queue_head_incr(oldsd);
5895 * netdev_increment_features - increment feature set by one
5896 * @all: current feature set
5897 * @one: new feature set
5898 * @mask: mask feature set
5900 * Computes a new feature set after adding a device with feature set
5901 * @one to the master device with current feature set @all. Will not
5902 * enable anything that is off in @mask. Returns the new feature set.
5904 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5907 /* If device needs checksumming, downgrade to it. */
5908 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5909 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5910 else if (mask & NETIF_F_ALL_CSUM) {
5911 /* If one device supports v4/v6 checksumming, set for all. */
5912 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5913 !(all & NETIF_F_GEN_CSUM)) {
5914 all &= ~NETIF_F_ALL_CSUM;
5915 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5918 /* If one device supports hw checksumming, set for all. */
5919 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5920 all &= ~NETIF_F_ALL_CSUM;
5921 all |= NETIF_F_HW_CSUM;
5925 one |= NETIF_F_ALL_CSUM;
5927 one |= all & NETIF_F_ONE_FOR_ALL;
5928 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5929 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5933 EXPORT_SYMBOL(netdev_increment_features);
5935 static struct hlist_head *netdev_create_hash(void)
5938 struct hlist_head *hash;
5940 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5942 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5943 INIT_HLIST_HEAD(&hash[i]);
5948 /* Initialize per network namespace state */
5949 static int __net_init netdev_init(struct net *net)
5951 INIT_LIST_HEAD(&net->dev_base_head);
5953 net->dev_name_head = netdev_create_hash();
5954 if (net->dev_name_head == NULL)
5957 net->dev_index_head = netdev_create_hash();
5958 if (net->dev_index_head == NULL)
5964 kfree(net->dev_name_head);
5970 * netdev_drivername - network driver for the device
5971 * @dev: network device
5972 * @buffer: buffer for resulting name
5973 * @len: size of buffer
5975 * Determine network driver for device.
5977 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5979 const struct device_driver *driver;
5980 const struct device *parent;
5982 if (len <= 0 || !buffer)
5986 parent = dev->dev.parent;
5991 driver = parent->driver;
5992 if (driver && driver->name)
5993 strlcpy(buffer, driver->name, len);
5997 static int __netdev_printk(const char *level, const struct net_device *dev,
5998 struct va_format *vaf)
6002 if (dev && dev->dev.parent)
6003 r = dev_printk(level, dev->dev.parent, "%s: %pV",
6004 netdev_name(dev), vaf);
6006 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6008 r = printk("%s(NULL net_device): %pV", level, vaf);
6013 int netdev_printk(const char *level, const struct net_device *dev,
6014 const char *format, ...)
6016 struct va_format vaf;
6020 va_start(args, format);
6025 r = __netdev_printk(level, dev, &vaf);
6030 EXPORT_SYMBOL(netdev_printk);
6032 #define define_netdev_printk_level(func, level) \
6033 int func(const struct net_device *dev, const char *fmt, ...) \
6036 struct va_format vaf; \
6039 va_start(args, fmt); \
6044 r = __netdev_printk(level, dev, &vaf); \
6049 EXPORT_SYMBOL(func);
6051 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6052 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6053 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6054 define_netdev_printk_level(netdev_err, KERN_ERR);
6055 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6056 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6057 define_netdev_printk_level(netdev_info, KERN_INFO);
6059 static void __net_exit netdev_exit(struct net *net)
6061 kfree(net->dev_name_head);
6062 kfree(net->dev_index_head);
6065 static struct pernet_operations __net_initdata netdev_net_ops = {
6066 .init = netdev_init,
6067 .exit = netdev_exit,
6070 static void __net_exit default_device_exit(struct net *net)
6072 struct net_device *dev, *aux;
6074 * Push all migratable network devices back to the
6075 * initial network namespace
6078 for_each_netdev_safe(net, dev, aux) {
6080 char fb_name[IFNAMSIZ];
6082 /* Ignore unmoveable devices (i.e. loopback) */
6083 if (dev->features & NETIF_F_NETNS_LOCAL)
6086 /* Leave virtual devices for the generic cleanup */
6087 if (dev->rtnl_link_ops)
6090 /* Push remaing network devices to init_net */
6091 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6092 err = dev_change_net_namespace(dev, &init_net, fb_name);
6094 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6095 __func__, dev->name, err);
6102 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6104 /* At exit all network devices most be removed from a network
6105 * namespace. Do this in the reverse order of registeration.
6106 * Do this across as many network namespaces as possible to
6107 * improve batching efficiency.
6109 struct net_device *dev;
6111 LIST_HEAD(dev_kill_list);
6114 list_for_each_entry(net, net_list, exit_list) {
6115 for_each_netdev_reverse(net, dev) {
6116 if (dev->rtnl_link_ops)
6117 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6119 unregister_netdevice_queue(dev, &dev_kill_list);
6122 unregister_netdevice_many(&dev_kill_list);
6126 static struct pernet_operations __net_initdata default_device_ops = {
6127 .exit = default_device_exit,
6128 .exit_batch = default_device_exit_batch,
6132 * Initialize the DEV module. At boot time this walks the device list and
6133 * unhooks any devices that fail to initialise (normally hardware not
6134 * present) and leaves us with a valid list of present and active devices.
6139 * This is called single threaded during boot, so no need
6140 * to take the rtnl semaphore.
6142 static int __init net_dev_init(void)
6144 int i, rc = -ENOMEM;
6146 BUG_ON(!dev_boot_phase);
6148 if (dev_proc_init())
6151 if (netdev_kobject_init())
6154 INIT_LIST_HEAD(&ptype_all);
6155 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6156 INIT_LIST_HEAD(&ptype_base[i]);
6158 if (register_pernet_subsys(&netdev_net_ops))
6162 * Initialise the packet receive queues.
6165 for_each_possible_cpu(i) {
6166 struct softnet_data *sd = &per_cpu(softnet_data, i);
6168 memset(sd, 0, sizeof(*sd));
6169 skb_queue_head_init(&sd->input_pkt_queue);
6170 skb_queue_head_init(&sd->process_queue);
6171 sd->completion_queue = NULL;
6172 INIT_LIST_HEAD(&sd->poll_list);
6173 sd->output_queue = NULL;
6174 sd->output_queue_tailp = &sd->output_queue;
6176 sd->csd.func = rps_trigger_softirq;
6182 sd->backlog.poll = process_backlog;
6183 sd->backlog.weight = weight_p;
6184 sd->backlog.gro_list = NULL;
6185 sd->backlog.gro_count = 0;
6190 /* The loopback device is special if any other network devices
6191 * is present in a network namespace the loopback device must
6192 * be present. Since we now dynamically allocate and free the
6193 * loopback device ensure this invariant is maintained by
6194 * keeping the loopback device as the first device on the
6195 * list of network devices. Ensuring the loopback devices
6196 * is the first device that appears and the last network device
6199 if (register_pernet_device(&loopback_net_ops))
6202 if (register_pernet_device(&default_device_ops))
6205 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
6206 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
6208 hotcpu_notifier(dev_cpu_callback, 0);
6216 subsys_initcall(net_dev_init);
6218 static int __init initialize_hashrnd(void)
6220 get_random_bytes(&hashrnd, sizeof(hashrnd));
6224 late_initcall_sync(initialize_hashrnd);