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/sched.h>
83 #include <linux/mutex.h>
84 #include <linux/string.h>
86 #include <linux/socket.h>
87 #include <linux/sockios.h>
88 #include <linux/errno.h>
89 #include <linux/interrupt.h>
90 #include <linux/if_ether.h>
91 #include <linux/netdevice.h>
92 #include <linux/etherdevice.h>
93 #include <linux/ethtool.h>
94 #include <linux/notifier.h>
95 #include <linux/skbuff.h>
96 #include <net/net_namespace.h>
98 #include <linux/rtnetlink.h>
99 #include <linux/proc_fs.h>
100 #include <linux/seq_file.h>
101 #include <linux/stat.h>
102 #include <linux/if_bridge.h>
103 #include <linux/if_macvlan.h>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <linux/highmem.h>
108 #include <linux/init.h>
109 #include <linux/kmod.h>
110 #include <linux/module.h>
111 #include <linux/netpoll.h>
112 #include <linux/rcupdate.h>
113 #include <linux/delay.h>
114 #include <net/wext.h>
115 #include <net/iw_handler.h>
116 #include <asm/current.h>
117 #include <linux/audit.h>
118 #include <linux/dmaengine.h>
119 #include <linux/err.h>
120 #include <linux/ctype.h>
121 #include <linux/if_arp.h>
122 #include <linux/if_vlan.h>
123 #include <linux/ip.h>
125 #include <linux/ipv6.h>
126 #include <linux/in.h>
127 #include <linux/jhash.h>
128 #include <linux/random.h>
130 #include "net-sysfs.h"
132 /* Instead of increasing this, you should create a hash table. */
133 #define MAX_GRO_SKBS 8
135 /* This should be increased if a protocol with a bigger head is added. */
136 #define GRO_MAX_HEAD (MAX_HEADER + 128)
139 * The list of packet types we will receive (as opposed to discard)
140 * and the routines to invoke.
142 * Why 16. Because with 16 the only overlap we get on a hash of the
143 * low nibble of the protocol value is RARP/SNAP/X.25.
145 * NOTE: That is no longer true with the addition of VLAN tags. Not
146 * sure which should go first, but I bet it won't make much
147 * difference if we are running VLANs. The good news is that
148 * this protocol won't be in the list unless compiled in, so
149 * the average user (w/out VLANs) will not be adversely affected.
166 #define PTYPE_HASH_SIZE (16)
167 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
169 static DEFINE_SPINLOCK(ptype_lock);
170 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
171 static struct list_head ptype_all __read_mostly; /* Taps */
174 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
177 * Pure readers hold dev_base_lock for reading.
179 * Writers must hold the rtnl semaphore while they loop through the
180 * dev_base_head list, and hold dev_base_lock for writing when they do the
181 * actual updates. This allows pure readers to access the list even
182 * while a writer is preparing to update it.
184 * To put it another way, dev_base_lock is held for writing only to
185 * protect against pure readers; the rtnl semaphore provides the
186 * protection against other writers.
188 * See, for example usages, register_netdevice() and
189 * unregister_netdevice(), which must be called with the rtnl
192 DEFINE_RWLOCK(dev_base_lock);
194 EXPORT_SYMBOL(dev_base_lock);
196 #define NETDEV_HASHBITS 8
197 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
199 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
201 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
202 return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
205 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
207 return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
210 /* Device list insertion */
211 static int list_netdevice(struct net_device *dev)
213 struct net *net = dev_net(dev);
217 write_lock_bh(&dev_base_lock);
218 list_add_tail(&dev->dev_list, &net->dev_base_head);
219 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
220 hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
221 write_unlock_bh(&dev_base_lock);
225 /* Device list removal */
226 static void unlist_netdevice(struct net_device *dev)
230 /* Unlink dev from the device chain */
231 write_lock_bh(&dev_base_lock);
232 list_del(&dev->dev_list);
233 hlist_del(&dev->name_hlist);
234 hlist_del(&dev->index_hlist);
235 write_unlock_bh(&dev_base_lock);
242 static RAW_NOTIFIER_HEAD(netdev_chain);
245 * Device drivers call our routines to queue packets here. We empty the
246 * queue in the local softnet handler.
249 DEFINE_PER_CPU(struct softnet_data, softnet_data);
251 #ifdef CONFIG_LOCKDEP
253 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
254 * according to dev->type
256 static const unsigned short netdev_lock_type[] =
257 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
258 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
259 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
260 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
261 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
262 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
263 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
264 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
265 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
266 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
267 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
268 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
269 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
270 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
271 ARPHRD_PHONET_PIPE, ARPHRD_VOID, ARPHRD_NONE};
273 static const char *netdev_lock_name[] =
274 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
275 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
276 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
277 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
278 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
279 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
280 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
281 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
282 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
283 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
284 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
285 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
286 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
287 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
288 "_xmit_PHONET_PIPE", "_xmit_VOID", "_xmit_NONE"};
290 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
291 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
293 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
297 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
298 if (netdev_lock_type[i] == dev_type)
300 /* the last key is used by default */
301 return ARRAY_SIZE(netdev_lock_type) - 1;
304 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
305 unsigned short dev_type)
309 i = netdev_lock_pos(dev_type);
310 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
311 netdev_lock_name[i]);
314 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
318 i = netdev_lock_pos(dev->type);
319 lockdep_set_class_and_name(&dev->addr_list_lock,
320 &netdev_addr_lock_key[i],
321 netdev_lock_name[i]);
324 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
325 unsigned short dev_type)
328 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
333 /*******************************************************************************
335 Protocol management and registration routines
337 *******************************************************************************/
340 * Add a protocol ID to the list. Now that the input handler is
341 * smarter we can dispense with all the messy stuff that used to be
344 * BEWARE!!! Protocol handlers, mangling input packets,
345 * MUST BE last in hash buckets and checking protocol handlers
346 * MUST start from promiscuous ptype_all chain in net_bh.
347 * It is true now, do not change it.
348 * Explanation follows: if protocol handler, mangling packet, will
349 * be the first on list, it is not able to sense, that packet
350 * is cloned and should be copied-on-write, so that it will
351 * change it and subsequent readers will get broken packet.
356 * dev_add_pack - add packet handler
357 * @pt: packet type declaration
359 * Add a protocol handler to the networking stack. The passed &packet_type
360 * is linked into kernel lists and may not be freed until it has been
361 * removed from the kernel lists.
363 * This call does not sleep therefore it can not
364 * guarantee all CPU's that are in middle of receiving packets
365 * will see the new packet type (until the next received packet).
368 void dev_add_pack(struct packet_type *pt)
372 spin_lock_bh(&ptype_lock);
373 if (pt->type == htons(ETH_P_ALL))
374 list_add_rcu(&pt->list, &ptype_all);
376 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
377 list_add_rcu(&pt->list, &ptype_base[hash]);
379 spin_unlock_bh(&ptype_lock);
383 * __dev_remove_pack - remove packet handler
384 * @pt: packet type declaration
386 * Remove a protocol handler that was previously added to the kernel
387 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
388 * from the kernel lists and can be freed or reused once this function
391 * The packet type might still be in use by receivers
392 * and must not be freed until after all the CPU's have gone
393 * through a quiescent state.
395 void __dev_remove_pack(struct packet_type *pt)
397 struct list_head *head;
398 struct packet_type *pt1;
400 spin_lock_bh(&ptype_lock);
402 if (pt->type == htons(ETH_P_ALL))
405 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
407 list_for_each_entry(pt1, head, list) {
409 list_del_rcu(&pt->list);
414 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
416 spin_unlock_bh(&ptype_lock);
419 * dev_remove_pack - remove packet handler
420 * @pt: packet type declaration
422 * Remove a protocol handler that was previously added to the kernel
423 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
424 * from the kernel lists and can be freed or reused once this function
427 * This call sleeps to guarantee that no CPU is looking at the packet
430 void dev_remove_pack(struct packet_type *pt)
432 __dev_remove_pack(pt);
437 /******************************************************************************
439 Device Boot-time Settings Routines
441 *******************************************************************************/
443 /* Boot time configuration table */
444 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
447 * netdev_boot_setup_add - add new setup entry
448 * @name: name of the device
449 * @map: configured settings for the device
451 * Adds new setup entry to the dev_boot_setup list. The function
452 * returns 0 on error and 1 on success. This is a generic routine to
455 static int netdev_boot_setup_add(char *name, struct ifmap *map)
457 struct netdev_boot_setup *s;
461 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
462 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
463 memset(s[i].name, 0, sizeof(s[i].name));
464 strlcpy(s[i].name, name, IFNAMSIZ);
465 memcpy(&s[i].map, map, sizeof(s[i].map));
470 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
474 * netdev_boot_setup_check - check boot time settings
475 * @dev: the netdevice
477 * Check boot time settings for the device.
478 * The found settings are set for the device to be used
479 * later in the device probing.
480 * Returns 0 if no settings found, 1 if they are.
482 int netdev_boot_setup_check(struct net_device *dev)
484 struct netdev_boot_setup *s = dev_boot_setup;
487 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
488 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
489 !strcmp(dev->name, s[i].name)) {
490 dev->irq = s[i].map.irq;
491 dev->base_addr = s[i].map.base_addr;
492 dev->mem_start = s[i].map.mem_start;
493 dev->mem_end = s[i].map.mem_end;
502 * netdev_boot_base - get address from boot time settings
503 * @prefix: prefix for network device
504 * @unit: id for network device
506 * Check boot time settings for the base address of device.
507 * The found settings are set for the device to be used
508 * later in the device probing.
509 * Returns 0 if no settings found.
511 unsigned long netdev_boot_base(const char *prefix, int unit)
513 const struct netdev_boot_setup *s = dev_boot_setup;
517 sprintf(name, "%s%d", prefix, unit);
520 * If device already registered then return base of 1
521 * to indicate not to probe for this interface
523 if (__dev_get_by_name(&init_net, name))
526 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
527 if (!strcmp(name, s[i].name))
528 return s[i].map.base_addr;
533 * Saves at boot time configured settings for any netdevice.
535 int __init netdev_boot_setup(char *str)
540 str = get_options(str, ARRAY_SIZE(ints), ints);
545 memset(&map, 0, sizeof(map));
549 map.base_addr = ints[2];
551 map.mem_start = ints[3];
553 map.mem_end = ints[4];
555 /* Add new entry to the list */
556 return netdev_boot_setup_add(str, &map);
559 __setup("netdev=", netdev_boot_setup);
561 /*******************************************************************************
563 Device Interface Subroutines
565 *******************************************************************************/
568 * __dev_get_by_name - find a device by its name
569 * @net: the applicable net namespace
570 * @name: name to find
572 * Find an interface by name. Must be called under RTNL semaphore
573 * or @dev_base_lock. If the name is found a pointer to the device
574 * is returned. If the name is not found then %NULL is returned. The
575 * reference counters are not incremented so the caller must be
576 * careful with locks.
579 struct net_device *__dev_get_by_name(struct net *net, const char *name)
581 struct hlist_node *p;
583 hlist_for_each(p, dev_name_hash(net, name)) {
584 struct net_device *dev
585 = hlist_entry(p, struct net_device, name_hlist);
586 if (!strncmp(dev->name, name, IFNAMSIZ))
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. This can be called from any
598 * context and does its own locking. The returned handle has
599 * the usage count incremented and the caller must use dev_put() to
600 * release it when it is no longer needed. %NULL is returned if no
601 * matching device is found.
604 struct net_device *dev_get_by_name(struct net *net, const char *name)
606 struct net_device *dev;
608 read_lock(&dev_base_lock);
609 dev = __dev_get_by_name(net, name);
612 read_unlock(&dev_base_lock);
617 * __dev_get_by_index - find a device by its ifindex
618 * @net: the applicable net namespace
619 * @ifindex: index of device
621 * Search for an interface by index. Returns %NULL if the device
622 * is not found or a pointer to the device. The device has not
623 * had its reference counter increased so the caller must be careful
624 * about locking. The caller must hold either the RTNL semaphore
628 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
630 struct hlist_node *p;
632 hlist_for_each(p, dev_index_hash(net, ifindex)) {
633 struct net_device *dev
634 = hlist_entry(p, struct net_device, index_hlist);
635 if (dev->ifindex == ifindex)
643 * dev_get_by_index - find a device by its ifindex
644 * @net: the applicable net namespace
645 * @ifindex: index of device
647 * Search for an interface by index. Returns NULL if the device
648 * is not found or a pointer to the device. The device returned has
649 * had a reference added and the pointer is safe until the user calls
650 * dev_put to indicate they have finished with it.
653 struct net_device *dev_get_by_index(struct net *net, int ifindex)
655 struct net_device *dev;
657 read_lock(&dev_base_lock);
658 dev = __dev_get_by_index(net, ifindex);
661 read_unlock(&dev_base_lock);
666 * dev_getbyhwaddr - find a device by its hardware address
667 * @net: the applicable net namespace
668 * @type: media type of device
669 * @ha: hardware address
671 * Search for an interface by MAC address. Returns NULL if the device
672 * is not found or a pointer to the device. The caller must hold the
673 * rtnl semaphore. The returned device has not had its ref count increased
674 * and the caller must therefore be careful about locking
677 * If the API was consistent this would be __dev_get_by_hwaddr
680 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
682 struct net_device *dev;
686 for_each_netdev(net, dev)
687 if (dev->type == type &&
688 !memcmp(dev->dev_addr, ha, dev->addr_len))
694 EXPORT_SYMBOL(dev_getbyhwaddr);
696 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
698 struct net_device *dev;
701 for_each_netdev(net, dev)
702 if (dev->type == type)
708 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
710 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
712 struct net_device *dev;
715 dev = __dev_getfirstbyhwtype(net, type);
722 EXPORT_SYMBOL(dev_getfirstbyhwtype);
725 * dev_get_by_flags - find any device with given flags
726 * @net: the applicable net namespace
727 * @if_flags: IFF_* values
728 * @mask: bitmask of bits in if_flags to check
730 * Search for any interface with the given flags. Returns NULL if a device
731 * is not found or a pointer to the device. The device returned has
732 * had a reference added and the pointer is safe until the user calls
733 * dev_put to indicate they have finished with it.
736 struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
738 struct net_device *dev, *ret;
741 read_lock(&dev_base_lock);
742 for_each_netdev(net, dev) {
743 if (((dev->flags ^ if_flags) & mask) == 0) {
749 read_unlock(&dev_base_lock);
754 * dev_valid_name - check if name is okay for network device
757 * Network device names need to be valid file names to
758 * to allow sysfs to work. We also disallow any kind of
761 int dev_valid_name(const char *name)
765 if (strlen(name) >= IFNAMSIZ)
767 if (!strcmp(name, ".") || !strcmp(name, ".."))
771 if (*name == '/' || isspace(*name))
779 * __dev_alloc_name - allocate a name for a device
780 * @net: network namespace to allocate the device name in
781 * @name: name format string
782 * @buf: scratch buffer and result name string
784 * Passed a format string - eg "lt%d" it will try and find a suitable
785 * id. It scans list of devices to build up a free map, then chooses
786 * the first empty slot. The caller must hold the dev_base or rtnl lock
787 * while allocating the name and adding the device in order to avoid
789 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
790 * Returns the number of the unit assigned or a negative errno code.
793 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
797 const int max_netdevices = 8*PAGE_SIZE;
798 unsigned long *inuse;
799 struct net_device *d;
801 p = strnchr(name, IFNAMSIZ-1, '%');
804 * Verify the string as this thing may have come from
805 * the user. There must be either one "%d" and no other "%"
808 if (p[1] != 'd' || strchr(p + 2, '%'))
811 /* Use one page as a bit array of possible slots */
812 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
816 for_each_netdev(net, d) {
817 if (!sscanf(d->name, name, &i))
819 if (i < 0 || i >= max_netdevices)
822 /* avoid cases where sscanf is not exact inverse of printf */
823 snprintf(buf, IFNAMSIZ, name, i);
824 if (!strncmp(buf, d->name, IFNAMSIZ))
828 i = find_first_zero_bit(inuse, max_netdevices);
829 free_page((unsigned long) inuse);
832 snprintf(buf, IFNAMSIZ, name, i);
833 if (!__dev_get_by_name(net, buf))
836 /* It is possible to run out of possible slots
837 * when the name is long and there isn't enough space left
838 * for the digits, or if all bits are used.
844 * dev_alloc_name - allocate a name for a device
846 * @name: name format string
848 * Passed a format string - eg "lt%d" it will try and find a suitable
849 * id. It scans list of devices to build up a free map, then chooses
850 * the first empty slot. The caller must hold the dev_base or rtnl lock
851 * while allocating the name and adding the device in order to avoid
853 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
854 * Returns the number of the unit assigned or a negative errno code.
857 int dev_alloc_name(struct net_device *dev, const char *name)
863 BUG_ON(!dev_net(dev));
865 ret = __dev_alloc_name(net, name, buf);
867 strlcpy(dev->name, buf, IFNAMSIZ);
873 * dev_change_name - change name of a device
875 * @newname: name (or format string) must be at least IFNAMSIZ
877 * Change name of a device, can pass format strings "eth%d".
880 int dev_change_name(struct net_device *dev, const char *newname)
882 char oldname[IFNAMSIZ];
888 BUG_ON(!dev_net(dev));
891 if (dev->flags & IFF_UP)
894 if (!dev_valid_name(newname))
897 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
900 memcpy(oldname, dev->name, IFNAMSIZ);
902 if (strchr(newname, '%')) {
903 err = dev_alloc_name(dev, newname);
907 else if (__dev_get_by_name(net, newname))
910 strlcpy(dev->name, newname, IFNAMSIZ);
913 /* For now only devices in the initial network namespace
916 if (net == &init_net) {
917 ret = device_rename(&dev->dev, dev->name);
919 memcpy(dev->name, oldname, IFNAMSIZ);
924 write_lock_bh(&dev_base_lock);
925 hlist_del(&dev->name_hlist);
926 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
927 write_unlock_bh(&dev_base_lock);
929 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
930 ret = notifier_to_errno(ret);
935 "%s: name change rollback failed: %d.\n",
939 memcpy(dev->name, oldname, IFNAMSIZ);
948 * dev_set_alias - change ifalias of a device
950 * @alias: name up to IFALIASZ
951 * @len: limit of bytes to copy from info
953 * Set ifalias for a device,
955 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
970 dev->ifalias = krealloc(dev->ifalias, len+1, GFP_KERNEL);
974 strlcpy(dev->ifalias, alias, len+1);
980 * netdev_features_change - device changes features
981 * @dev: device to cause notification
983 * Called to indicate a device has changed features.
985 void netdev_features_change(struct net_device *dev)
987 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
989 EXPORT_SYMBOL(netdev_features_change);
992 * netdev_state_change - device changes state
993 * @dev: device to cause notification
995 * Called to indicate a device has changed state. This function calls
996 * the notifier chains for netdev_chain and sends a NEWLINK message
997 * to the routing socket.
999 void netdev_state_change(struct net_device *dev)
1001 if (dev->flags & IFF_UP) {
1002 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1003 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1007 void netdev_bonding_change(struct net_device *dev)
1009 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
1011 EXPORT_SYMBOL(netdev_bonding_change);
1014 * dev_load - load a network module
1015 * @net: the applicable net namespace
1016 * @name: name of interface
1018 * If a network interface is not present and the process has suitable
1019 * privileges this function loads the module. If module loading is not
1020 * available in this kernel then it becomes a nop.
1023 void dev_load(struct net *net, const char *name)
1025 struct net_device *dev;
1027 read_lock(&dev_base_lock);
1028 dev = __dev_get_by_name(net, name);
1029 read_unlock(&dev_base_lock);
1031 if (!dev && capable(CAP_SYS_MODULE))
1032 request_module("%s", name);
1036 * dev_open - prepare an interface for use.
1037 * @dev: device to open
1039 * Takes a device from down to up state. The device's private open
1040 * function is invoked and then the multicast lists are loaded. Finally
1041 * the device is moved into the up state and a %NETDEV_UP message is
1042 * sent to the netdev notifier chain.
1044 * Calling this function on an active interface is a nop. On a failure
1045 * a negative errno code is returned.
1047 int dev_open(struct net_device *dev)
1049 const struct net_device_ops *ops = dev->netdev_ops;
1058 if (dev->flags & IFF_UP)
1062 * Is it even present?
1064 if (!netif_device_present(dev))
1068 * Call device private open method
1070 set_bit(__LINK_STATE_START, &dev->state);
1072 if (ops->ndo_validate_addr)
1073 ret = ops->ndo_validate_addr(dev);
1075 if (!ret && ops->ndo_open)
1076 ret = ops->ndo_open(dev);
1079 * If it went open OK then:
1083 clear_bit(__LINK_STATE_START, &dev->state);
1088 dev->flags |= IFF_UP;
1093 net_dmaengine_get();
1096 * Initialize multicasting status
1098 dev_set_rx_mode(dev);
1101 * Wakeup transmit queue engine
1106 * ... and announce new interface.
1108 call_netdevice_notifiers(NETDEV_UP, dev);
1115 * dev_close - shutdown an interface.
1116 * @dev: device to shutdown
1118 * This function moves an active device into down state. A
1119 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1120 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1123 int dev_close(struct net_device *dev)
1125 const struct net_device_ops *ops = dev->netdev_ops;
1130 if (!(dev->flags & IFF_UP))
1134 * Tell people we are going down, so that they can
1135 * prepare to death, when device is still operating.
1137 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1139 clear_bit(__LINK_STATE_START, &dev->state);
1141 /* Synchronize to scheduled poll. We cannot touch poll list,
1142 * it can be even on different cpu. So just clear netif_running().
1144 * dev->stop() will invoke napi_disable() on all of it's
1145 * napi_struct instances on this device.
1147 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1149 dev_deactivate(dev);
1152 * Call the device specific close. This cannot fail.
1153 * Only if device is UP
1155 * We allow it to be called even after a DETACH hot-plug
1162 * Device is now down.
1165 dev->flags &= ~IFF_UP;
1168 * Tell people we are down
1170 call_netdevice_notifiers(NETDEV_DOWN, dev);
1175 net_dmaengine_put();
1182 * dev_disable_lro - disable Large Receive Offload on a device
1185 * Disable Large Receive Offload (LRO) on a net device. Must be
1186 * called under RTNL. This is needed if received packets may be
1187 * forwarded to another interface.
1189 void dev_disable_lro(struct net_device *dev)
1191 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1192 dev->ethtool_ops->set_flags) {
1193 u32 flags = dev->ethtool_ops->get_flags(dev);
1194 if (flags & ETH_FLAG_LRO) {
1195 flags &= ~ETH_FLAG_LRO;
1196 dev->ethtool_ops->set_flags(dev, flags);
1199 WARN_ON(dev->features & NETIF_F_LRO);
1201 EXPORT_SYMBOL(dev_disable_lro);
1204 static int dev_boot_phase = 1;
1207 * Device change register/unregister. These are not inline or static
1208 * as we export them to the world.
1212 * register_netdevice_notifier - register a network notifier block
1215 * Register a notifier to be called when network device events occur.
1216 * The notifier passed is linked into the kernel structures and must
1217 * not be reused until it has been unregistered. A negative errno code
1218 * is returned on a failure.
1220 * When registered all registration and up events are replayed
1221 * to the new notifier to allow device to have a race free
1222 * view of the network device list.
1225 int register_netdevice_notifier(struct notifier_block *nb)
1227 struct net_device *dev;
1228 struct net_device *last;
1233 err = raw_notifier_chain_register(&netdev_chain, nb);
1239 for_each_netdev(net, dev) {
1240 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1241 err = notifier_to_errno(err);
1245 if (!(dev->flags & IFF_UP))
1248 nb->notifier_call(nb, NETDEV_UP, dev);
1259 for_each_netdev(net, dev) {
1263 if (dev->flags & IFF_UP) {
1264 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1265 nb->notifier_call(nb, NETDEV_DOWN, dev);
1267 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1271 raw_notifier_chain_unregister(&netdev_chain, nb);
1276 * unregister_netdevice_notifier - unregister a network notifier block
1279 * Unregister a notifier previously registered by
1280 * register_netdevice_notifier(). The notifier is unlinked into the
1281 * kernel structures and may then be reused. A negative errno code
1282 * is returned on a failure.
1285 int unregister_netdevice_notifier(struct notifier_block *nb)
1290 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1296 * call_netdevice_notifiers - call all network notifier blocks
1297 * @val: value passed unmodified to notifier function
1298 * @dev: net_device pointer passed unmodified to notifier function
1300 * Call all network notifier blocks. Parameters and return value
1301 * are as for raw_notifier_call_chain().
1304 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1306 return raw_notifier_call_chain(&netdev_chain, val, dev);
1309 /* When > 0 there are consumers of rx skb time stamps */
1310 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1312 void net_enable_timestamp(void)
1314 atomic_inc(&netstamp_needed);
1317 void net_disable_timestamp(void)
1319 atomic_dec(&netstamp_needed);
1322 static inline void net_timestamp(struct sk_buff *skb)
1324 if (atomic_read(&netstamp_needed))
1325 __net_timestamp(skb);
1327 skb->tstamp.tv64 = 0;
1331 * Support routine. Sends outgoing frames to any network
1332 * taps currently in use.
1335 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1337 struct packet_type *ptype;
1342 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1343 /* Never send packets back to the socket
1344 * they originated from - MvS (miquels@drinkel.ow.org)
1346 if ((ptype->dev == dev || !ptype->dev) &&
1347 (ptype->af_packet_priv == NULL ||
1348 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1349 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1353 /* skb->nh should be correctly
1354 set by sender, so that the second statement is
1355 just protection against buggy protocols.
1357 skb_reset_mac_header(skb2);
1359 if (skb_network_header(skb2) < skb2->data ||
1360 skb2->network_header > skb2->tail) {
1361 if (net_ratelimit())
1362 printk(KERN_CRIT "protocol %04x is "
1364 skb2->protocol, dev->name);
1365 skb_reset_network_header(skb2);
1368 skb2->transport_header = skb2->network_header;
1369 skb2->pkt_type = PACKET_OUTGOING;
1370 ptype->func(skb2, skb->dev, ptype, skb->dev);
1377 static inline void __netif_reschedule(struct Qdisc *q)
1379 struct softnet_data *sd;
1380 unsigned long flags;
1382 local_irq_save(flags);
1383 sd = &__get_cpu_var(softnet_data);
1384 q->next_sched = sd->output_queue;
1385 sd->output_queue = q;
1386 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1387 local_irq_restore(flags);
1390 void __netif_schedule(struct Qdisc *q)
1392 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1393 __netif_reschedule(q);
1395 EXPORT_SYMBOL(__netif_schedule);
1397 void dev_kfree_skb_irq(struct sk_buff *skb)
1399 if (atomic_dec_and_test(&skb->users)) {
1400 struct softnet_data *sd;
1401 unsigned long flags;
1403 local_irq_save(flags);
1404 sd = &__get_cpu_var(softnet_data);
1405 skb->next = sd->completion_queue;
1406 sd->completion_queue = skb;
1407 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1408 local_irq_restore(flags);
1411 EXPORT_SYMBOL(dev_kfree_skb_irq);
1413 void dev_kfree_skb_any(struct sk_buff *skb)
1415 if (in_irq() || irqs_disabled())
1416 dev_kfree_skb_irq(skb);
1420 EXPORT_SYMBOL(dev_kfree_skb_any);
1424 * netif_device_detach - mark device as removed
1425 * @dev: network device
1427 * Mark device as removed from system and therefore no longer available.
1429 void netif_device_detach(struct net_device *dev)
1431 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1432 netif_running(dev)) {
1433 netif_stop_queue(dev);
1436 EXPORT_SYMBOL(netif_device_detach);
1439 * netif_device_attach - mark device as attached
1440 * @dev: network device
1442 * Mark device as attached from system and restart if needed.
1444 void netif_device_attach(struct net_device *dev)
1446 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1447 netif_running(dev)) {
1448 netif_wake_queue(dev);
1449 __netdev_watchdog_up(dev);
1452 EXPORT_SYMBOL(netif_device_attach);
1454 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1456 return ((features & NETIF_F_GEN_CSUM) ||
1457 ((features & NETIF_F_IP_CSUM) &&
1458 protocol == htons(ETH_P_IP)) ||
1459 ((features & NETIF_F_IPV6_CSUM) &&
1460 protocol == htons(ETH_P_IPV6)));
1463 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1465 if (can_checksum_protocol(dev->features, skb->protocol))
1468 if (skb->protocol == htons(ETH_P_8021Q)) {
1469 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1470 if (can_checksum_protocol(dev->features & dev->vlan_features,
1471 veh->h_vlan_encapsulated_proto))
1479 * Invalidate hardware checksum when packet is to be mangled, and
1480 * complete checksum manually on outgoing path.
1482 int skb_checksum_help(struct sk_buff *skb)
1485 int ret = 0, offset;
1487 if (skb->ip_summed == CHECKSUM_COMPLETE)
1488 goto out_set_summed;
1490 if (unlikely(skb_shinfo(skb)->gso_size)) {
1491 /* Let GSO fix up the checksum. */
1492 goto out_set_summed;
1495 offset = skb->csum_start - skb_headroom(skb);
1496 BUG_ON(offset >= skb_headlen(skb));
1497 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1499 offset += skb->csum_offset;
1500 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1502 if (skb_cloned(skb) &&
1503 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1504 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1509 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1511 skb->ip_summed = CHECKSUM_NONE;
1517 * skb_gso_segment - Perform segmentation on skb.
1518 * @skb: buffer to segment
1519 * @features: features for the output path (see dev->features)
1521 * This function segments the given skb and returns a list of segments.
1523 * It may return NULL if the skb requires no segmentation. This is
1524 * only possible when GSO is used for verifying header integrity.
1526 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1528 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1529 struct packet_type *ptype;
1530 __be16 type = skb->protocol;
1533 skb_reset_mac_header(skb);
1534 skb->mac_len = skb->network_header - skb->mac_header;
1535 __skb_pull(skb, skb->mac_len);
1537 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1538 struct net_device *dev = skb->dev;
1539 struct ethtool_drvinfo info = {};
1541 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1542 dev->ethtool_ops->get_drvinfo(dev, &info);
1544 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1546 info.driver, dev ? dev->features : 0L,
1547 skb->sk ? skb->sk->sk_route_caps : 0L,
1548 skb->len, skb->data_len, skb->ip_summed);
1550 if (skb_header_cloned(skb) &&
1551 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1552 return ERR_PTR(err);
1556 list_for_each_entry_rcu(ptype,
1557 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1558 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1559 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1560 err = ptype->gso_send_check(skb);
1561 segs = ERR_PTR(err);
1562 if (err || skb_gso_ok(skb, features))
1564 __skb_push(skb, (skb->data -
1565 skb_network_header(skb)));
1567 segs = ptype->gso_segment(skb, features);
1573 __skb_push(skb, skb->data - skb_mac_header(skb));
1578 EXPORT_SYMBOL(skb_gso_segment);
1580 /* Take action when hardware reception checksum errors are detected. */
1582 void netdev_rx_csum_fault(struct net_device *dev)
1584 if (net_ratelimit()) {
1585 printk(KERN_ERR "%s: hw csum failure.\n",
1586 dev ? dev->name : "<unknown>");
1590 EXPORT_SYMBOL(netdev_rx_csum_fault);
1593 /* Actually, we should eliminate this check as soon as we know, that:
1594 * 1. IOMMU is present and allows to map all the memory.
1595 * 2. No high memory really exists on this machine.
1598 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1600 #ifdef CONFIG_HIGHMEM
1603 if (dev->features & NETIF_F_HIGHDMA)
1606 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1607 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1615 void (*destructor)(struct sk_buff *skb);
1618 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1620 static void dev_gso_skb_destructor(struct sk_buff *skb)
1622 struct dev_gso_cb *cb;
1625 struct sk_buff *nskb = skb->next;
1627 skb->next = nskb->next;
1630 } while (skb->next);
1632 cb = DEV_GSO_CB(skb);
1634 cb->destructor(skb);
1638 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1639 * @skb: buffer to segment
1641 * This function segments the given skb and stores the list of segments
1644 static int dev_gso_segment(struct sk_buff *skb)
1646 struct net_device *dev = skb->dev;
1647 struct sk_buff *segs;
1648 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1651 segs = skb_gso_segment(skb, features);
1653 /* Verifying header integrity only. */
1658 return PTR_ERR(segs);
1661 DEV_GSO_CB(skb)->destructor = skb->destructor;
1662 skb->destructor = dev_gso_skb_destructor;
1667 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1668 struct netdev_queue *txq)
1670 const struct net_device_ops *ops = dev->netdev_ops;
1672 prefetch(&dev->netdev_ops->ndo_start_xmit);
1673 if (likely(!skb->next)) {
1674 if (!list_empty(&ptype_all))
1675 dev_queue_xmit_nit(skb, dev);
1677 if (netif_needs_gso(dev, skb)) {
1678 if (unlikely(dev_gso_segment(skb)))
1684 return ops->ndo_start_xmit(skb, dev);
1689 struct sk_buff *nskb = skb->next;
1692 skb->next = nskb->next;
1694 rc = ops->ndo_start_xmit(nskb, dev);
1696 nskb->next = skb->next;
1700 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1701 return NETDEV_TX_BUSY;
1702 } while (skb->next);
1704 skb->destructor = DEV_GSO_CB(skb)->destructor;
1711 static u32 simple_tx_hashrnd;
1712 static int simple_tx_hashrnd_initialized = 0;
1714 static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb)
1716 u32 addr1, addr2, ports;
1720 if (unlikely(!simple_tx_hashrnd_initialized)) {
1721 get_random_bytes(&simple_tx_hashrnd, 4);
1722 simple_tx_hashrnd_initialized = 1;
1725 switch (skb->protocol) {
1726 case htons(ETH_P_IP):
1727 if (!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)))
1728 ip_proto = ip_hdr(skb)->protocol;
1729 addr1 = ip_hdr(skb)->saddr;
1730 addr2 = ip_hdr(skb)->daddr;
1731 ihl = ip_hdr(skb)->ihl;
1733 case htons(ETH_P_IPV6):
1734 ip_proto = ipv6_hdr(skb)->nexthdr;
1735 addr1 = ipv6_hdr(skb)->saddr.s6_addr32[3];
1736 addr2 = ipv6_hdr(skb)->daddr.s6_addr32[3];
1751 case IPPROTO_UDPLITE:
1752 ports = *((u32 *) (skb_network_header(skb) + (ihl * 4)));
1760 hash = jhash_3words(addr1, addr2, ports, simple_tx_hashrnd);
1762 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1765 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
1766 struct sk_buff *skb)
1768 const struct net_device_ops *ops = dev->netdev_ops;
1769 u16 queue_index = 0;
1771 if (ops->ndo_select_queue)
1772 queue_index = ops->ndo_select_queue(dev, skb);
1773 else if (dev->real_num_tx_queues > 1)
1774 queue_index = simple_tx_hash(dev, skb);
1776 skb_set_queue_mapping(skb, queue_index);
1777 return netdev_get_tx_queue(dev, queue_index);
1781 * dev_queue_xmit - transmit a buffer
1782 * @skb: buffer to transmit
1784 * Queue a buffer for transmission to a network device. The caller must
1785 * have set the device and priority and built the buffer before calling
1786 * this function. The function can be called from an interrupt.
1788 * A negative errno code is returned on a failure. A success does not
1789 * guarantee the frame will be transmitted as it may be dropped due
1790 * to congestion or traffic shaping.
1792 * -----------------------------------------------------------------------------------
1793 * I notice this method can also return errors from the queue disciplines,
1794 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1797 * Regardless of the return value, the skb is consumed, so it is currently
1798 * difficult to retry a send to this method. (You can bump the ref count
1799 * before sending to hold a reference for retry if you are careful.)
1801 * When calling this method, interrupts MUST be enabled. This is because
1802 * the BH enable code must have IRQs enabled so that it will not deadlock.
1805 int dev_queue_xmit(struct sk_buff *skb)
1807 struct net_device *dev = skb->dev;
1808 struct netdev_queue *txq;
1812 /* GSO will handle the following emulations directly. */
1813 if (netif_needs_gso(dev, skb))
1816 if (skb_shinfo(skb)->frag_list &&
1817 !(dev->features & NETIF_F_FRAGLIST) &&
1818 __skb_linearize(skb))
1821 /* Fragmented skb is linearized if device does not support SG,
1822 * or if at least one of fragments is in highmem and device
1823 * does not support DMA from it.
1825 if (skb_shinfo(skb)->nr_frags &&
1826 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1827 __skb_linearize(skb))
1830 /* If packet is not checksummed and device does not support
1831 * checksumming for this protocol, complete checksumming here.
1833 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1834 skb_set_transport_header(skb, skb->csum_start -
1836 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
1841 /* Disable soft irqs for various locks below. Also
1842 * stops preemption for RCU.
1846 txq = dev_pick_tx(dev, skb);
1847 q = rcu_dereference(txq->qdisc);
1849 #ifdef CONFIG_NET_CLS_ACT
1850 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1853 spinlock_t *root_lock = qdisc_lock(q);
1855 spin_lock(root_lock);
1857 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
1861 rc = qdisc_enqueue_root(skb, q);
1864 spin_unlock(root_lock);
1869 /* The device has no queue. Common case for software devices:
1870 loopback, all the sorts of tunnels...
1872 Really, it is unlikely that netif_tx_lock protection is necessary
1873 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1875 However, it is possible, that they rely on protection
1878 Check this and shot the lock. It is not prone from deadlocks.
1879 Either shot noqueue qdisc, it is even simpler 8)
1881 if (dev->flags & IFF_UP) {
1882 int cpu = smp_processor_id(); /* ok because BHs are off */
1884 if (txq->xmit_lock_owner != cpu) {
1886 HARD_TX_LOCK(dev, txq, cpu);
1888 if (!netif_tx_queue_stopped(txq)) {
1890 if (!dev_hard_start_xmit(skb, dev, txq)) {
1891 HARD_TX_UNLOCK(dev, txq);
1895 HARD_TX_UNLOCK(dev, txq);
1896 if (net_ratelimit())
1897 printk(KERN_CRIT "Virtual device %s asks to "
1898 "queue packet!\n", dev->name);
1900 /* Recursion is detected! It is possible,
1902 if (net_ratelimit())
1903 printk(KERN_CRIT "Dead loop on virtual device "
1904 "%s, fix it urgently!\n", dev->name);
1909 rcu_read_unlock_bh();
1915 rcu_read_unlock_bh();
1920 /*=======================================================================
1922 =======================================================================*/
1924 int netdev_max_backlog __read_mostly = 1000;
1925 int netdev_budget __read_mostly = 300;
1926 int weight_p __read_mostly = 64; /* old backlog weight */
1928 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1932 * netif_rx - post buffer to the network code
1933 * @skb: buffer to post
1935 * This function receives a packet from a device driver and queues it for
1936 * the upper (protocol) levels to process. It always succeeds. The buffer
1937 * may be dropped during processing for congestion control or by the
1941 * NET_RX_SUCCESS (no congestion)
1942 * NET_RX_DROP (packet was dropped)
1946 int netif_rx(struct sk_buff *skb)
1948 struct softnet_data *queue;
1949 unsigned long flags;
1951 /* if netpoll wants it, pretend we never saw it */
1952 if (netpoll_rx(skb))
1955 if (!skb->tstamp.tv64)
1959 * The code is rearranged so that the path is the most
1960 * short when CPU is congested, but is still operating.
1962 local_irq_save(flags);
1963 queue = &__get_cpu_var(softnet_data);
1965 __get_cpu_var(netdev_rx_stat).total++;
1966 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1967 if (queue->input_pkt_queue.qlen) {
1969 __skb_queue_tail(&queue->input_pkt_queue, skb);
1970 local_irq_restore(flags);
1971 return NET_RX_SUCCESS;
1974 napi_schedule(&queue->backlog);
1978 __get_cpu_var(netdev_rx_stat).dropped++;
1979 local_irq_restore(flags);
1985 int netif_rx_ni(struct sk_buff *skb)
1990 err = netif_rx(skb);
1991 if (local_softirq_pending())
1998 EXPORT_SYMBOL(netif_rx_ni);
2000 static void net_tx_action(struct softirq_action *h)
2002 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2004 if (sd->completion_queue) {
2005 struct sk_buff *clist;
2007 local_irq_disable();
2008 clist = sd->completion_queue;
2009 sd->completion_queue = NULL;
2013 struct sk_buff *skb = clist;
2014 clist = clist->next;
2016 WARN_ON(atomic_read(&skb->users));
2021 if (sd->output_queue) {
2024 local_irq_disable();
2025 head = sd->output_queue;
2026 sd->output_queue = NULL;
2030 struct Qdisc *q = head;
2031 spinlock_t *root_lock;
2033 head = head->next_sched;
2035 root_lock = qdisc_lock(q);
2036 if (spin_trylock(root_lock)) {
2037 smp_mb__before_clear_bit();
2038 clear_bit(__QDISC_STATE_SCHED,
2041 spin_unlock(root_lock);
2043 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2045 __netif_reschedule(q);
2047 smp_mb__before_clear_bit();
2048 clear_bit(__QDISC_STATE_SCHED,
2056 static inline int deliver_skb(struct sk_buff *skb,
2057 struct packet_type *pt_prev,
2058 struct net_device *orig_dev)
2060 atomic_inc(&skb->users);
2061 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2064 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2065 /* These hooks defined here for ATM */
2067 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
2068 unsigned char *addr);
2069 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
2072 * If bridge module is loaded call bridging hook.
2073 * returns NULL if packet was consumed.
2075 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2076 struct sk_buff *skb) __read_mostly;
2077 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2078 struct packet_type **pt_prev, int *ret,
2079 struct net_device *orig_dev)
2081 struct net_bridge_port *port;
2083 if (skb->pkt_type == PACKET_LOOPBACK ||
2084 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2088 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2092 return br_handle_frame_hook(port, skb);
2095 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2098 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2099 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2100 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2102 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2103 struct packet_type **pt_prev,
2105 struct net_device *orig_dev)
2107 if (skb->dev->macvlan_port == NULL)
2111 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2114 return macvlan_handle_frame_hook(skb);
2117 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2120 #ifdef CONFIG_NET_CLS_ACT
2121 /* TODO: Maybe we should just force sch_ingress to be compiled in
2122 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2123 * a compare and 2 stores extra right now if we dont have it on
2124 * but have CONFIG_NET_CLS_ACT
2125 * NOTE: This doesnt stop any functionality; if you dont have
2126 * the ingress scheduler, you just cant add policies on ingress.
2129 static int ing_filter(struct sk_buff *skb)
2131 struct net_device *dev = skb->dev;
2132 u32 ttl = G_TC_RTTL(skb->tc_verd);
2133 struct netdev_queue *rxq;
2134 int result = TC_ACT_OK;
2137 if (MAX_RED_LOOP < ttl++) {
2139 "Redir loop detected Dropping packet (%d->%d)\n",
2140 skb->iif, dev->ifindex);
2144 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2145 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2147 rxq = &dev->rx_queue;
2150 if (q != &noop_qdisc) {
2151 spin_lock(qdisc_lock(q));
2152 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2153 result = qdisc_enqueue_root(skb, q);
2154 spin_unlock(qdisc_lock(q));
2160 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2161 struct packet_type **pt_prev,
2162 int *ret, struct net_device *orig_dev)
2164 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2168 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2171 /* Huh? Why does turning on AF_PACKET affect this? */
2172 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2175 switch (ing_filter(skb)) {
2189 * netif_nit_deliver - deliver received packets to network taps
2192 * This function is used to deliver incoming packets to network
2193 * taps. It should be used when the normal netif_receive_skb path
2194 * is bypassed, for example because of VLAN acceleration.
2196 void netif_nit_deliver(struct sk_buff *skb)
2198 struct packet_type *ptype;
2200 if (list_empty(&ptype_all))
2203 skb_reset_network_header(skb);
2204 skb_reset_transport_header(skb);
2205 skb->mac_len = skb->network_header - skb->mac_header;
2208 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2209 if (!ptype->dev || ptype->dev == skb->dev)
2210 deliver_skb(skb, ptype, skb->dev);
2216 * netif_receive_skb - process receive buffer from network
2217 * @skb: buffer to process
2219 * netif_receive_skb() is the main receive data processing function.
2220 * It always succeeds. The buffer may be dropped during processing
2221 * for congestion control or by the protocol layers.
2223 * This function may only be called from softirq context and interrupts
2224 * should be enabled.
2226 * Return values (usually ignored):
2227 * NET_RX_SUCCESS: no congestion
2228 * NET_RX_DROP: packet was dropped
2230 int netif_receive_skb(struct sk_buff *skb)
2232 struct packet_type *ptype, *pt_prev;
2233 struct net_device *orig_dev;
2234 struct net_device *null_or_orig;
2235 int ret = NET_RX_DROP;
2238 if (skb->vlan_tci && vlan_hwaccel_do_receive(skb))
2239 return NET_RX_SUCCESS;
2241 /* if we've gotten here through NAPI, check netpoll */
2242 if (netpoll_receive_skb(skb))
2245 if (!skb->tstamp.tv64)
2249 skb->iif = skb->dev->ifindex;
2251 null_or_orig = NULL;
2252 orig_dev = skb->dev;
2253 if (orig_dev->master) {
2254 if (skb_bond_should_drop(skb))
2255 null_or_orig = orig_dev; /* deliver only exact match */
2257 skb->dev = orig_dev->master;
2260 __get_cpu_var(netdev_rx_stat).total++;
2262 skb_reset_network_header(skb);
2263 skb_reset_transport_header(skb);
2264 skb->mac_len = skb->network_header - skb->mac_header;
2270 #ifdef CONFIG_NET_CLS_ACT
2271 if (skb->tc_verd & TC_NCLS) {
2272 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2277 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2278 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2279 ptype->dev == orig_dev) {
2281 ret = deliver_skb(skb, pt_prev, orig_dev);
2286 #ifdef CONFIG_NET_CLS_ACT
2287 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2293 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2296 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2300 type = skb->protocol;
2301 list_for_each_entry_rcu(ptype,
2302 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2303 if (ptype->type == type &&
2304 (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2305 ptype->dev == orig_dev)) {
2307 ret = deliver_skb(skb, pt_prev, orig_dev);
2313 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2316 /* Jamal, now you will not able to escape explaining
2317 * me how you were going to use this. :-)
2327 /* Network device is going away, flush any packets still pending */
2328 static void flush_backlog(void *arg)
2330 struct net_device *dev = arg;
2331 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2332 struct sk_buff *skb, *tmp;
2334 skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp)
2335 if (skb->dev == dev) {
2336 __skb_unlink(skb, &queue->input_pkt_queue);
2341 static int napi_gro_complete(struct sk_buff *skb)
2343 struct packet_type *ptype;
2344 __be16 type = skb->protocol;
2345 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2348 if (NAPI_GRO_CB(skb)->count == 1)
2352 list_for_each_entry_rcu(ptype, head, list) {
2353 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2356 err = ptype->gro_complete(skb);
2362 WARN_ON(&ptype->list == head);
2364 return NET_RX_SUCCESS;
2368 skb_shinfo(skb)->gso_size = 0;
2369 __skb_push(skb, -skb_network_offset(skb));
2370 return netif_receive_skb(skb);
2373 void napi_gro_flush(struct napi_struct *napi)
2375 struct sk_buff *skb, *next;
2377 for (skb = napi->gro_list; skb; skb = next) {
2380 napi_gro_complete(skb);
2383 napi->gro_list = NULL;
2385 EXPORT_SYMBOL(napi_gro_flush);
2387 int dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2389 struct sk_buff **pp = NULL;
2390 struct packet_type *ptype;
2391 __be16 type = skb->protocol;
2392 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2398 if (!(skb->dev->features & NETIF_F_GRO))
2401 if (skb_is_gso(skb) || skb_shinfo(skb)->frag_list)
2405 list_for_each_entry_rcu(ptype, head, list) {
2408 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
2411 skb_reset_network_header(skb);
2412 mac_len = skb->network_header - skb->mac_header;
2413 skb->mac_len = mac_len;
2414 NAPI_GRO_CB(skb)->same_flow = 0;
2415 NAPI_GRO_CB(skb)->flush = 0;
2416 NAPI_GRO_CB(skb)->free = 0;
2418 for (p = napi->gro_list; p; p = p->next) {
2421 if (!NAPI_GRO_CB(p)->same_flow)
2424 if (p->mac_len != mac_len ||
2425 memcmp(skb_mac_header(p), skb_mac_header(skb),
2427 NAPI_GRO_CB(p)->same_flow = 0;
2430 pp = ptype->gro_receive(&napi->gro_list, skb);
2435 if (&ptype->list == head)
2438 same_flow = NAPI_GRO_CB(skb)->same_flow;
2439 free = NAPI_GRO_CB(skb)->free;
2442 struct sk_buff *nskb = *pp;
2446 napi_gro_complete(nskb);
2453 if (NAPI_GRO_CB(skb)->flush || count >= MAX_GRO_SKBS) {
2454 __skb_push(skb, -skb_network_offset(skb));
2458 NAPI_GRO_CB(skb)->count = 1;
2459 skb_shinfo(skb)->gso_size = skb->len;
2460 skb->next = napi->gro_list;
2461 napi->gro_list = skb;
2469 EXPORT_SYMBOL(dev_gro_receive);
2471 static int __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2475 for (p = napi->gro_list; p; p = p->next) {
2476 NAPI_GRO_CB(p)->same_flow = 1;
2477 NAPI_GRO_CB(p)->flush = 0;
2480 return dev_gro_receive(napi, skb);
2483 int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2485 if (netpoll_receive_skb(skb))
2488 switch (__napi_gro_receive(napi, skb)) {
2490 return netif_receive_skb(skb);
2497 return NET_RX_SUCCESS;
2499 EXPORT_SYMBOL(napi_gro_receive);
2501 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
2503 __skb_pull(skb, skb_headlen(skb));
2504 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
2508 EXPORT_SYMBOL(napi_reuse_skb);
2510 struct sk_buff *napi_fraginfo_skb(struct napi_struct *napi,
2511 struct napi_gro_fraginfo *info)
2513 struct net_device *dev = napi->dev;
2514 struct sk_buff *skb = napi->skb;
2519 skb = netdev_alloc_skb(dev, GRO_MAX_HEAD + NET_IP_ALIGN);
2523 skb_reserve(skb, NET_IP_ALIGN);
2526 BUG_ON(info->nr_frags > MAX_SKB_FRAGS);
2527 skb_shinfo(skb)->nr_frags = info->nr_frags;
2528 memcpy(skb_shinfo(skb)->frags, info->frags, sizeof(info->frags));
2530 skb->data_len = info->len;
2531 skb->len += info->len;
2532 skb->truesize += info->len;
2534 if (!pskb_may_pull(skb, ETH_HLEN)) {
2535 napi_reuse_skb(napi, skb);
2540 skb->protocol = eth_type_trans(skb, dev);
2542 skb->ip_summed = info->ip_summed;
2543 skb->csum = info->csum;
2548 EXPORT_SYMBOL(napi_fraginfo_skb);
2550 int napi_gro_frags(struct napi_struct *napi, struct napi_gro_fraginfo *info)
2552 struct sk_buff *skb = napi_fraginfo_skb(napi, info);
2553 int err = NET_RX_DROP;
2558 if (netpoll_receive_skb(skb))
2561 err = NET_RX_SUCCESS;
2563 switch (__napi_gro_receive(napi, skb)) {
2565 return netif_receive_skb(skb);
2571 napi_reuse_skb(napi, skb);
2576 EXPORT_SYMBOL(napi_gro_frags);
2578 static int process_backlog(struct napi_struct *napi, int quota)
2581 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2582 unsigned long start_time = jiffies;
2584 napi->weight = weight_p;
2586 struct sk_buff *skb;
2588 local_irq_disable();
2589 skb = __skb_dequeue(&queue->input_pkt_queue);
2592 napi_complete(napi);
2597 napi_gro_receive(napi, skb);
2598 } while (++work < quota && jiffies == start_time);
2600 napi_gro_flush(napi);
2607 * __napi_schedule - schedule for receive
2608 * @n: entry to schedule
2610 * The entry's receive function will be scheduled to run
2612 void __napi_schedule(struct napi_struct *n)
2614 unsigned long flags;
2616 local_irq_save(flags);
2617 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2618 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2619 local_irq_restore(flags);
2621 EXPORT_SYMBOL(__napi_schedule);
2623 void __napi_complete(struct napi_struct *n)
2625 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
2626 BUG_ON(n->gro_list);
2628 list_del(&n->poll_list);
2629 smp_mb__before_clear_bit();
2630 clear_bit(NAPI_STATE_SCHED, &n->state);
2632 EXPORT_SYMBOL(__napi_complete);
2634 void napi_complete(struct napi_struct *n)
2636 unsigned long flags;
2639 * don't let napi dequeue from the cpu poll list
2640 * just in case its running on a different cpu
2642 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
2646 local_irq_save(flags);
2648 local_irq_restore(flags);
2650 EXPORT_SYMBOL(napi_complete);
2652 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
2653 int (*poll)(struct napi_struct *, int), int weight)
2655 INIT_LIST_HEAD(&napi->poll_list);
2656 napi->gro_list = NULL;
2659 napi->weight = weight;
2660 list_add(&napi->dev_list, &dev->napi_list);
2662 #ifdef CONFIG_NETPOLL
2663 spin_lock_init(&napi->poll_lock);
2664 napi->poll_owner = -1;
2666 set_bit(NAPI_STATE_SCHED, &napi->state);
2668 EXPORT_SYMBOL(netif_napi_add);
2670 void netif_napi_del(struct napi_struct *napi)
2672 struct sk_buff *skb, *next;
2674 list_del_init(&napi->dev_list);
2675 kfree_skb(napi->skb);
2677 for (skb = napi->gro_list; skb; skb = next) {
2683 napi->gro_list = NULL;
2685 EXPORT_SYMBOL(netif_napi_del);
2688 static void net_rx_action(struct softirq_action *h)
2690 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2691 unsigned long time_limit = jiffies + 2;
2692 int budget = netdev_budget;
2695 local_irq_disable();
2697 while (!list_empty(list)) {
2698 struct napi_struct *n;
2701 /* If softirq window is exhuasted then punt.
2702 * Allow this to run for 2 jiffies since which will allow
2703 * an average latency of 1.5/HZ.
2705 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
2710 /* Even though interrupts have been re-enabled, this
2711 * access is safe because interrupts can only add new
2712 * entries to the tail of this list, and only ->poll()
2713 * calls can remove this head entry from the list.
2715 n = list_entry(list->next, struct napi_struct, poll_list);
2717 have = netpoll_poll_lock(n);
2721 /* This NAPI_STATE_SCHED test is for avoiding a race
2722 * with netpoll's poll_napi(). Only the entity which
2723 * obtains the lock and sees NAPI_STATE_SCHED set will
2724 * actually make the ->poll() call. Therefore we avoid
2725 * accidently calling ->poll() when NAPI is not scheduled.
2728 if (test_bit(NAPI_STATE_SCHED, &n->state))
2729 work = n->poll(n, weight);
2731 WARN_ON_ONCE(work > weight);
2735 local_irq_disable();
2737 /* Drivers must not modify the NAPI state if they
2738 * consume the entire weight. In such cases this code
2739 * still "owns" the NAPI instance and therefore can
2740 * move the instance around on the list at-will.
2742 if (unlikely(work == weight)) {
2743 if (unlikely(napi_disable_pending(n)))
2746 list_move_tail(&n->poll_list, list);
2749 netpoll_poll_unlock(have);
2754 #ifdef CONFIG_NET_DMA
2756 * There may not be any more sk_buffs coming right now, so push
2757 * any pending DMA copies to hardware
2759 dma_issue_pending_all();
2765 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2766 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2770 static gifconf_func_t * gifconf_list [NPROTO];
2773 * register_gifconf - register a SIOCGIF handler
2774 * @family: Address family
2775 * @gifconf: Function handler
2777 * Register protocol dependent address dumping routines. The handler
2778 * that is passed must not be freed or reused until it has been replaced
2779 * by another handler.
2781 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2783 if (family >= NPROTO)
2785 gifconf_list[family] = gifconf;
2791 * Map an interface index to its name (SIOCGIFNAME)
2795 * We need this ioctl for efficient implementation of the
2796 * if_indextoname() function required by the IPv6 API. Without
2797 * it, we would have to search all the interfaces to find a
2801 static int dev_ifname(struct net *net, struct ifreq __user *arg)
2803 struct net_device *dev;
2807 * Fetch the caller's info block.
2810 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2813 read_lock(&dev_base_lock);
2814 dev = __dev_get_by_index(net, ifr.ifr_ifindex);
2816 read_unlock(&dev_base_lock);
2820 strcpy(ifr.ifr_name, dev->name);
2821 read_unlock(&dev_base_lock);
2823 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2829 * Perform a SIOCGIFCONF call. This structure will change
2830 * size eventually, and there is nothing I can do about it.
2831 * Thus we will need a 'compatibility mode'.
2834 static int dev_ifconf(struct net *net, char __user *arg)
2837 struct net_device *dev;
2844 * Fetch the caller's info block.
2847 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2854 * Loop over the interfaces, and write an info block for each.
2858 for_each_netdev(net, dev) {
2859 for (i = 0; i < NPROTO; i++) {
2860 if (gifconf_list[i]) {
2863 done = gifconf_list[i](dev, NULL, 0);
2865 done = gifconf_list[i](dev, pos + total,
2875 * All done. Write the updated control block back to the caller.
2877 ifc.ifc_len = total;
2880 * Both BSD and Solaris return 0 here, so we do too.
2882 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2885 #ifdef CONFIG_PROC_FS
2887 * This is invoked by the /proc filesystem handler to display a device
2890 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2891 __acquires(dev_base_lock)
2893 struct net *net = seq_file_net(seq);
2895 struct net_device *dev;
2897 read_lock(&dev_base_lock);
2899 return SEQ_START_TOKEN;
2902 for_each_netdev(net, dev)
2909 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2911 struct net *net = seq_file_net(seq);
2913 return v == SEQ_START_TOKEN ?
2914 first_net_device(net) : next_net_device((struct net_device *)v);
2917 void dev_seq_stop(struct seq_file *seq, void *v)
2918 __releases(dev_base_lock)
2920 read_unlock(&dev_base_lock);
2923 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2925 const struct net_device_stats *stats = dev_get_stats(dev);
2927 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2928 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2929 dev->name, stats->rx_bytes, stats->rx_packets,
2931 stats->rx_dropped + stats->rx_missed_errors,
2932 stats->rx_fifo_errors,
2933 stats->rx_length_errors + stats->rx_over_errors +
2934 stats->rx_crc_errors + stats->rx_frame_errors,
2935 stats->rx_compressed, stats->multicast,
2936 stats->tx_bytes, stats->tx_packets,
2937 stats->tx_errors, stats->tx_dropped,
2938 stats->tx_fifo_errors, stats->collisions,
2939 stats->tx_carrier_errors +
2940 stats->tx_aborted_errors +
2941 stats->tx_window_errors +
2942 stats->tx_heartbeat_errors,
2943 stats->tx_compressed);
2947 * Called from the PROCfs module. This now uses the new arbitrary sized
2948 * /proc/net interface to create /proc/net/dev
2950 static int dev_seq_show(struct seq_file *seq, void *v)
2952 if (v == SEQ_START_TOKEN)
2953 seq_puts(seq, "Inter-| Receive "
2955 " face |bytes packets errs drop fifo frame "
2956 "compressed multicast|bytes packets errs "
2957 "drop fifo colls carrier compressed\n");
2959 dev_seq_printf_stats(seq, v);
2963 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2965 struct netif_rx_stats *rc = NULL;
2967 while (*pos < nr_cpu_ids)
2968 if (cpu_online(*pos)) {
2969 rc = &per_cpu(netdev_rx_stat, *pos);
2976 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2978 return softnet_get_online(pos);
2981 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2984 return softnet_get_online(pos);
2987 static void softnet_seq_stop(struct seq_file *seq, void *v)
2991 static int softnet_seq_show(struct seq_file *seq, void *v)
2993 struct netif_rx_stats *s = v;
2995 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2996 s->total, s->dropped, s->time_squeeze, 0,
2997 0, 0, 0, 0, /* was fastroute */
3002 static const struct seq_operations dev_seq_ops = {
3003 .start = dev_seq_start,
3004 .next = dev_seq_next,
3005 .stop = dev_seq_stop,
3006 .show = dev_seq_show,
3009 static int dev_seq_open(struct inode *inode, struct file *file)
3011 return seq_open_net(inode, file, &dev_seq_ops,
3012 sizeof(struct seq_net_private));
3015 static const struct file_operations dev_seq_fops = {
3016 .owner = THIS_MODULE,
3017 .open = dev_seq_open,
3019 .llseek = seq_lseek,
3020 .release = seq_release_net,
3023 static const struct seq_operations softnet_seq_ops = {
3024 .start = softnet_seq_start,
3025 .next = softnet_seq_next,
3026 .stop = softnet_seq_stop,
3027 .show = softnet_seq_show,
3030 static int softnet_seq_open(struct inode *inode, struct file *file)
3032 return seq_open(file, &softnet_seq_ops);
3035 static const struct file_operations softnet_seq_fops = {
3036 .owner = THIS_MODULE,
3037 .open = softnet_seq_open,
3039 .llseek = seq_lseek,
3040 .release = seq_release,
3043 static void *ptype_get_idx(loff_t pos)
3045 struct packet_type *pt = NULL;
3049 list_for_each_entry_rcu(pt, &ptype_all, list) {
3055 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3056 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3065 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3069 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3072 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3074 struct packet_type *pt;
3075 struct list_head *nxt;
3079 if (v == SEQ_START_TOKEN)
3080 return ptype_get_idx(0);
3083 nxt = pt->list.next;
3084 if (pt->type == htons(ETH_P_ALL)) {
3085 if (nxt != &ptype_all)
3088 nxt = ptype_base[0].next;
3090 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3092 while (nxt == &ptype_base[hash]) {
3093 if (++hash >= PTYPE_HASH_SIZE)
3095 nxt = ptype_base[hash].next;
3098 return list_entry(nxt, struct packet_type, list);
3101 static void ptype_seq_stop(struct seq_file *seq, void *v)
3107 static int ptype_seq_show(struct seq_file *seq, void *v)
3109 struct packet_type *pt = v;
3111 if (v == SEQ_START_TOKEN)
3112 seq_puts(seq, "Type Device Function\n");
3113 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3114 if (pt->type == htons(ETH_P_ALL))
3115 seq_puts(seq, "ALL ");
3117 seq_printf(seq, "%04x", ntohs(pt->type));
3119 seq_printf(seq, " %-8s %pF\n",
3120 pt->dev ? pt->dev->name : "", pt->func);
3126 static const struct seq_operations ptype_seq_ops = {
3127 .start = ptype_seq_start,
3128 .next = ptype_seq_next,
3129 .stop = ptype_seq_stop,
3130 .show = ptype_seq_show,
3133 static int ptype_seq_open(struct inode *inode, struct file *file)
3135 return seq_open_net(inode, file, &ptype_seq_ops,
3136 sizeof(struct seq_net_private));
3139 static const struct file_operations ptype_seq_fops = {
3140 .owner = THIS_MODULE,
3141 .open = ptype_seq_open,
3143 .llseek = seq_lseek,
3144 .release = seq_release_net,
3148 static int __net_init dev_proc_net_init(struct net *net)
3152 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3154 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3156 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3159 if (wext_proc_init(net))
3165 proc_net_remove(net, "ptype");
3167 proc_net_remove(net, "softnet_stat");
3169 proc_net_remove(net, "dev");
3173 static void __net_exit dev_proc_net_exit(struct net *net)
3175 wext_proc_exit(net);
3177 proc_net_remove(net, "ptype");
3178 proc_net_remove(net, "softnet_stat");
3179 proc_net_remove(net, "dev");
3182 static struct pernet_operations __net_initdata dev_proc_ops = {
3183 .init = dev_proc_net_init,
3184 .exit = dev_proc_net_exit,
3187 static int __init dev_proc_init(void)
3189 return register_pernet_subsys(&dev_proc_ops);
3192 #define dev_proc_init() 0
3193 #endif /* CONFIG_PROC_FS */
3197 * netdev_set_master - set up master/slave pair
3198 * @slave: slave device
3199 * @master: new master device
3201 * Changes the master device of the slave. Pass %NULL to break the
3202 * bonding. The caller must hold the RTNL semaphore. On a failure
3203 * a negative errno code is returned. On success the reference counts
3204 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3205 * function returns zero.
3207 int netdev_set_master(struct net_device *slave, struct net_device *master)
3209 struct net_device *old = slave->master;
3219 slave->master = master;
3227 slave->flags |= IFF_SLAVE;
3229 slave->flags &= ~IFF_SLAVE;
3231 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3235 static void dev_change_rx_flags(struct net_device *dev, int flags)
3237 const struct net_device_ops *ops = dev->netdev_ops;
3239 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3240 ops->ndo_change_rx_flags(dev, flags);
3243 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3245 unsigned short old_flags = dev->flags;
3251 dev->flags |= IFF_PROMISC;
3252 dev->promiscuity += inc;
3253 if (dev->promiscuity == 0) {
3256 * If inc causes overflow, untouch promisc and return error.
3259 dev->flags &= ~IFF_PROMISC;
3261 dev->promiscuity -= inc;
3262 printk(KERN_WARNING "%s: promiscuity touches roof, "
3263 "set promiscuity failed, promiscuity feature "
3264 "of device might be broken.\n", dev->name);
3268 if (dev->flags != old_flags) {
3269 printk(KERN_INFO "device %s %s promiscuous mode\n",
3270 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3272 if (audit_enabled) {
3273 current_uid_gid(&uid, &gid);
3274 audit_log(current->audit_context, GFP_ATOMIC,
3275 AUDIT_ANOM_PROMISCUOUS,
3276 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3277 dev->name, (dev->flags & IFF_PROMISC),
3278 (old_flags & IFF_PROMISC),
3279 audit_get_loginuid(current),
3281 audit_get_sessionid(current));
3284 dev_change_rx_flags(dev, IFF_PROMISC);
3290 * dev_set_promiscuity - update promiscuity count on a device
3294 * Add or remove promiscuity from a device. While the count in the device
3295 * remains above zero the interface remains promiscuous. Once it hits zero
3296 * the device reverts back to normal filtering operation. A negative inc
3297 * value is used to drop promiscuity on the device.
3298 * Return 0 if successful or a negative errno code on error.
3300 int dev_set_promiscuity(struct net_device *dev, int inc)
3302 unsigned short old_flags = dev->flags;
3305 err = __dev_set_promiscuity(dev, inc);
3308 if (dev->flags != old_flags)
3309 dev_set_rx_mode(dev);
3314 * dev_set_allmulti - update allmulti count on a device
3318 * Add or remove reception of all multicast frames to a device. While the
3319 * count in the device remains above zero the interface remains listening
3320 * to all interfaces. Once it hits zero the device reverts back to normal
3321 * filtering operation. A negative @inc value is used to drop the counter
3322 * when releasing a resource needing all multicasts.
3323 * Return 0 if successful or a negative errno code on error.
3326 int dev_set_allmulti(struct net_device *dev, int inc)
3328 unsigned short old_flags = dev->flags;
3332 dev->flags |= IFF_ALLMULTI;
3333 dev->allmulti += inc;
3334 if (dev->allmulti == 0) {
3337 * If inc causes overflow, untouch allmulti and return error.
3340 dev->flags &= ~IFF_ALLMULTI;
3342 dev->allmulti -= inc;
3343 printk(KERN_WARNING "%s: allmulti touches roof, "
3344 "set allmulti failed, allmulti feature of "
3345 "device might be broken.\n", dev->name);
3349 if (dev->flags ^ old_flags) {
3350 dev_change_rx_flags(dev, IFF_ALLMULTI);
3351 dev_set_rx_mode(dev);
3357 * Upload unicast and multicast address lists to device and
3358 * configure RX filtering. When the device doesn't support unicast
3359 * filtering it is put in promiscuous mode while unicast addresses
3362 void __dev_set_rx_mode(struct net_device *dev)
3364 const struct net_device_ops *ops = dev->netdev_ops;
3366 /* dev_open will call this function so the list will stay sane. */
3367 if (!(dev->flags&IFF_UP))
3370 if (!netif_device_present(dev))
3373 if (ops->ndo_set_rx_mode)
3374 ops->ndo_set_rx_mode(dev);
3376 /* Unicast addresses changes may only happen under the rtnl,
3377 * therefore calling __dev_set_promiscuity here is safe.
3379 if (dev->uc_count > 0 && !dev->uc_promisc) {
3380 __dev_set_promiscuity(dev, 1);
3381 dev->uc_promisc = 1;
3382 } else if (dev->uc_count == 0 && dev->uc_promisc) {
3383 __dev_set_promiscuity(dev, -1);
3384 dev->uc_promisc = 0;
3387 if (ops->ndo_set_multicast_list)
3388 ops->ndo_set_multicast_list(dev);
3392 void dev_set_rx_mode(struct net_device *dev)
3394 netif_addr_lock_bh(dev);
3395 __dev_set_rx_mode(dev);
3396 netif_addr_unlock_bh(dev);
3399 int __dev_addr_delete(struct dev_addr_list **list, int *count,
3400 void *addr, int alen, int glbl)
3402 struct dev_addr_list *da;
3404 for (; (da = *list) != NULL; list = &da->next) {
3405 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3406 alen == da->da_addrlen) {
3408 int old_glbl = da->da_gusers;
3425 int __dev_addr_add(struct dev_addr_list **list, int *count,
3426 void *addr, int alen, int glbl)
3428 struct dev_addr_list *da;
3430 for (da = *list; da != NULL; da = da->next) {
3431 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3432 da->da_addrlen == alen) {
3434 int old_glbl = da->da_gusers;
3444 da = kzalloc(sizeof(*da), GFP_ATOMIC);
3447 memcpy(da->da_addr, addr, alen);
3448 da->da_addrlen = alen;
3450 da->da_gusers = glbl ? 1 : 0;
3458 * dev_unicast_delete - Release secondary unicast address.
3460 * @addr: address to delete
3461 * @alen: length of @addr
3463 * Release reference to a secondary unicast address and remove it
3464 * from the device if the reference count drops to zero.
3466 * The caller must hold the rtnl_mutex.
3468 int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
3474 netif_addr_lock_bh(dev);
3475 err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3477 __dev_set_rx_mode(dev);
3478 netif_addr_unlock_bh(dev);
3481 EXPORT_SYMBOL(dev_unicast_delete);
3484 * dev_unicast_add - add a secondary unicast address
3486 * @addr: address to add
3487 * @alen: length of @addr
3489 * Add a secondary unicast address to the device or increase
3490 * the reference count if it already exists.
3492 * The caller must hold the rtnl_mutex.
3494 int dev_unicast_add(struct net_device *dev, void *addr, int alen)
3500 netif_addr_lock_bh(dev);
3501 err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3503 __dev_set_rx_mode(dev);
3504 netif_addr_unlock_bh(dev);
3507 EXPORT_SYMBOL(dev_unicast_add);
3509 int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
3510 struct dev_addr_list **from, int *from_count)
3512 struct dev_addr_list *da, *next;
3516 while (da != NULL) {
3518 if (!da->da_synced) {
3519 err = __dev_addr_add(to, to_count,
3520 da->da_addr, da->da_addrlen, 0);
3525 } else if (da->da_users == 1) {
3526 __dev_addr_delete(to, to_count,
3527 da->da_addr, da->da_addrlen, 0);
3528 __dev_addr_delete(from, from_count,
3529 da->da_addr, da->da_addrlen, 0);
3536 void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
3537 struct dev_addr_list **from, int *from_count)
3539 struct dev_addr_list *da, *next;
3542 while (da != NULL) {
3544 if (da->da_synced) {
3545 __dev_addr_delete(to, to_count,
3546 da->da_addr, da->da_addrlen, 0);
3548 __dev_addr_delete(from, from_count,
3549 da->da_addr, da->da_addrlen, 0);
3556 * dev_unicast_sync - Synchronize device's unicast list to another device
3557 * @to: destination device
3558 * @from: source device
3560 * Add newly added addresses to the destination device and release
3561 * addresses that have no users left. The source device must be
3562 * locked by netif_tx_lock_bh.
3564 * This function is intended to be called from the dev->set_rx_mode
3565 * function of layered software devices.
3567 int dev_unicast_sync(struct net_device *to, struct net_device *from)
3571 netif_addr_lock_bh(to);
3572 err = __dev_addr_sync(&to->uc_list, &to->uc_count,
3573 &from->uc_list, &from->uc_count);
3575 __dev_set_rx_mode(to);
3576 netif_addr_unlock_bh(to);
3579 EXPORT_SYMBOL(dev_unicast_sync);
3582 * dev_unicast_unsync - Remove synchronized addresses from the destination device
3583 * @to: destination device
3584 * @from: source device
3586 * Remove all addresses that were added to the destination device by
3587 * dev_unicast_sync(). This function is intended to be called from the
3588 * dev->stop function of layered software devices.
3590 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
3592 netif_addr_lock_bh(from);
3593 netif_addr_lock(to);
3595 __dev_addr_unsync(&to->uc_list, &to->uc_count,
3596 &from->uc_list, &from->uc_count);
3597 __dev_set_rx_mode(to);
3599 netif_addr_unlock(to);
3600 netif_addr_unlock_bh(from);
3602 EXPORT_SYMBOL(dev_unicast_unsync);
3604 static void __dev_addr_discard(struct dev_addr_list **list)
3606 struct dev_addr_list *tmp;
3608 while (*list != NULL) {
3611 if (tmp->da_users > tmp->da_gusers)
3612 printk("__dev_addr_discard: address leakage! "
3613 "da_users=%d\n", tmp->da_users);
3618 static void dev_addr_discard(struct net_device *dev)
3620 netif_addr_lock_bh(dev);
3622 __dev_addr_discard(&dev->uc_list);
3625 __dev_addr_discard(&dev->mc_list);
3628 netif_addr_unlock_bh(dev);
3632 * dev_get_flags - get flags reported to userspace
3635 * Get the combination of flag bits exported through APIs to userspace.
3637 unsigned dev_get_flags(const struct net_device *dev)
3641 flags = (dev->flags & ~(IFF_PROMISC |
3646 (dev->gflags & (IFF_PROMISC |
3649 if (netif_running(dev)) {
3650 if (netif_oper_up(dev))
3651 flags |= IFF_RUNNING;
3652 if (netif_carrier_ok(dev))
3653 flags |= IFF_LOWER_UP;
3654 if (netif_dormant(dev))
3655 flags |= IFF_DORMANT;
3662 * dev_change_flags - change device settings
3664 * @flags: device state flags
3666 * Change settings on device based state flags. The flags are
3667 * in the userspace exported format.
3669 int dev_change_flags(struct net_device *dev, unsigned flags)
3672 int old_flags = dev->flags;
3677 * Set the flags on our device.
3680 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
3681 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
3683 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
3687 * Load in the correct multicast list now the flags have changed.
3690 if ((old_flags ^ flags) & IFF_MULTICAST)
3691 dev_change_rx_flags(dev, IFF_MULTICAST);
3693 dev_set_rx_mode(dev);
3696 * Have we downed the interface. We handle IFF_UP ourselves
3697 * according to user attempts to set it, rather than blindly
3702 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
3703 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
3706 dev_set_rx_mode(dev);
3709 if (dev->flags & IFF_UP &&
3710 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
3712 call_netdevice_notifiers(NETDEV_CHANGE, dev);
3714 if ((flags ^ dev->gflags) & IFF_PROMISC) {
3715 int inc = (flags & IFF_PROMISC) ? +1 : -1;
3716 dev->gflags ^= IFF_PROMISC;
3717 dev_set_promiscuity(dev, inc);
3720 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
3721 is important. Some (broken) drivers set IFF_PROMISC, when
3722 IFF_ALLMULTI is requested not asking us and not reporting.
3724 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
3725 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
3726 dev->gflags ^= IFF_ALLMULTI;
3727 dev_set_allmulti(dev, inc);
3730 /* Exclude state transition flags, already notified */
3731 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
3733 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
3739 * dev_set_mtu - Change maximum transfer unit
3741 * @new_mtu: new transfer unit
3743 * Change the maximum transfer size of the network device.
3745 int dev_set_mtu(struct net_device *dev, int new_mtu)
3747 const struct net_device_ops *ops = dev->netdev_ops;
3750 if (new_mtu == dev->mtu)
3753 /* MTU must be positive. */
3757 if (!netif_device_present(dev))
3761 if (ops->ndo_change_mtu)
3762 err = ops->ndo_change_mtu(dev, new_mtu);
3766 if (!err && dev->flags & IFF_UP)
3767 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
3772 * dev_set_mac_address - Change Media Access Control Address
3776 * Change the hardware (MAC) address of the device
3778 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
3780 const struct net_device_ops *ops = dev->netdev_ops;
3783 if (!ops->ndo_set_mac_address)
3785 if (sa->sa_family != dev->type)
3787 if (!netif_device_present(dev))
3789 err = ops->ndo_set_mac_address(dev, sa);
3791 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3796 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
3798 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
3801 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3807 case SIOCGIFFLAGS: /* Get interface flags */
3808 ifr->ifr_flags = dev_get_flags(dev);
3811 case SIOCGIFMETRIC: /* Get the metric on the interface
3812 (currently unused) */
3813 ifr->ifr_metric = 0;
3816 case SIOCGIFMTU: /* Get the MTU of a device */
3817 ifr->ifr_mtu = dev->mtu;
3822 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
3824 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
3825 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3826 ifr->ifr_hwaddr.sa_family = dev->type;
3834 ifr->ifr_map.mem_start = dev->mem_start;
3835 ifr->ifr_map.mem_end = dev->mem_end;
3836 ifr->ifr_map.base_addr = dev->base_addr;
3837 ifr->ifr_map.irq = dev->irq;
3838 ifr->ifr_map.dma = dev->dma;
3839 ifr->ifr_map.port = dev->if_port;
3843 ifr->ifr_ifindex = dev->ifindex;
3847 ifr->ifr_qlen = dev->tx_queue_len;
3851 /* dev_ioctl() should ensure this case
3863 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
3865 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
3868 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3869 const struct net_device_ops *ops;
3874 ops = dev->netdev_ops;
3877 case SIOCSIFFLAGS: /* Set interface flags */
3878 return dev_change_flags(dev, ifr->ifr_flags);
3880 case SIOCSIFMETRIC: /* Set the metric on the interface
3881 (currently unused) */
3884 case SIOCSIFMTU: /* Set the MTU of a device */
3885 return dev_set_mtu(dev, ifr->ifr_mtu);
3888 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
3890 case SIOCSIFHWBROADCAST:
3891 if (ifr->ifr_hwaddr.sa_family != dev->type)
3893 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
3894 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3895 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3899 if (ops->ndo_set_config) {
3900 if (!netif_device_present(dev))
3902 return ops->ndo_set_config(dev, &ifr->ifr_map);
3907 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
3908 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3910 if (!netif_device_present(dev))
3912 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
3916 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
3917 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3919 if (!netif_device_present(dev))
3921 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
3925 if (ifr->ifr_qlen < 0)
3927 dev->tx_queue_len = ifr->ifr_qlen;
3931 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
3932 return dev_change_name(dev, ifr->ifr_newname);
3935 * Unknown or private ioctl
3939 if ((cmd >= SIOCDEVPRIVATE &&
3940 cmd <= SIOCDEVPRIVATE + 15) ||
3941 cmd == SIOCBONDENSLAVE ||
3942 cmd == SIOCBONDRELEASE ||
3943 cmd == SIOCBONDSETHWADDR ||
3944 cmd == SIOCBONDSLAVEINFOQUERY ||
3945 cmd == SIOCBONDINFOQUERY ||
3946 cmd == SIOCBONDCHANGEACTIVE ||
3947 cmd == SIOCGMIIPHY ||
3948 cmd == SIOCGMIIREG ||
3949 cmd == SIOCSMIIREG ||
3950 cmd == SIOCBRADDIF ||
3951 cmd == SIOCBRDELIF ||
3952 cmd == SIOCWANDEV) {
3954 if (ops->ndo_do_ioctl) {
3955 if (netif_device_present(dev))
3956 err = ops->ndo_do_ioctl(dev, ifr, cmd);
3968 * This function handles all "interface"-type I/O control requests. The actual
3969 * 'doing' part of this is dev_ifsioc above.
3973 * dev_ioctl - network device ioctl
3974 * @net: the applicable net namespace
3975 * @cmd: command to issue
3976 * @arg: pointer to a struct ifreq in user space
3978 * Issue ioctl functions to devices. This is normally called by the
3979 * user space syscall interfaces but can sometimes be useful for
3980 * other purposes. The return value is the return from the syscall if
3981 * positive or a negative errno code on error.
3984 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
3990 /* One special case: SIOCGIFCONF takes ifconf argument
3991 and requires shared lock, because it sleeps writing
3995 if (cmd == SIOCGIFCONF) {
3997 ret = dev_ifconf(net, (char __user *) arg);
4001 if (cmd == SIOCGIFNAME)
4002 return dev_ifname(net, (struct ifreq __user *)arg);
4004 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4007 ifr.ifr_name[IFNAMSIZ-1] = 0;
4009 colon = strchr(ifr.ifr_name, ':');
4014 * See which interface the caller is talking about.
4019 * These ioctl calls:
4020 * - can be done by all.
4021 * - atomic and do not require locking.
4032 dev_load(net, ifr.ifr_name);
4033 read_lock(&dev_base_lock);
4034 ret = dev_ifsioc_locked(net, &ifr, cmd);
4035 read_unlock(&dev_base_lock);
4039 if (copy_to_user(arg, &ifr,
4040 sizeof(struct ifreq)))
4046 dev_load(net, ifr.ifr_name);
4048 ret = dev_ethtool(net, &ifr);
4053 if (copy_to_user(arg, &ifr,
4054 sizeof(struct ifreq)))
4060 * These ioctl calls:
4061 * - require superuser power.
4062 * - require strict serialization.
4068 if (!capable(CAP_NET_ADMIN))
4070 dev_load(net, ifr.ifr_name);
4072 ret = dev_ifsioc(net, &ifr, cmd);
4077 if (copy_to_user(arg, &ifr,
4078 sizeof(struct ifreq)))
4084 * These ioctl calls:
4085 * - require superuser power.
4086 * - require strict serialization.
4087 * - do not return a value
4097 case SIOCSIFHWBROADCAST:
4100 case SIOCBONDENSLAVE:
4101 case SIOCBONDRELEASE:
4102 case SIOCBONDSETHWADDR:
4103 case SIOCBONDCHANGEACTIVE:
4106 if (!capable(CAP_NET_ADMIN))
4109 case SIOCBONDSLAVEINFOQUERY:
4110 case SIOCBONDINFOQUERY:
4111 dev_load(net, ifr.ifr_name);
4113 ret = dev_ifsioc(net, &ifr, cmd);
4118 /* Get the per device memory space. We can add this but
4119 * currently do not support it */
4121 /* Set the per device memory buffer space.
4122 * Not applicable in our case */
4127 * Unknown or private ioctl.
4130 if (cmd == SIOCWANDEV ||
4131 (cmd >= SIOCDEVPRIVATE &&
4132 cmd <= SIOCDEVPRIVATE + 15)) {
4133 dev_load(net, ifr.ifr_name);
4135 ret = dev_ifsioc(net, &ifr, cmd);
4137 if (!ret && copy_to_user(arg, &ifr,
4138 sizeof(struct ifreq)))
4142 /* Take care of Wireless Extensions */
4143 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4144 return wext_handle_ioctl(net, &ifr, cmd, arg);
4151 * dev_new_index - allocate an ifindex
4152 * @net: the applicable net namespace
4154 * Returns a suitable unique value for a new device interface
4155 * number. The caller must hold the rtnl semaphore or the
4156 * dev_base_lock to be sure it remains unique.
4158 static int dev_new_index(struct net *net)
4164 if (!__dev_get_by_index(net, ifindex))
4169 /* Delayed registration/unregisteration */
4170 static LIST_HEAD(net_todo_list);
4172 static void net_set_todo(struct net_device *dev)
4174 list_add_tail(&dev->todo_list, &net_todo_list);
4177 static void rollback_registered(struct net_device *dev)
4179 BUG_ON(dev_boot_phase);
4182 /* Some devices call without registering for initialization unwind. */
4183 if (dev->reg_state == NETREG_UNINITIALIZED) {
4184 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
4185 "was registered\n", dev->name, dev);
4191 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4193 /* If device is running, close it first. */
4196 /* And unlink it from device chain. */
4197 unlist_netdevice(dev);
4199 dev->reg_state = NETREG_UNREGISTERING;
4203 /* Shutdown queueing discipline. */
4207 /* Notify protocols, that we are about to destroy
4208 this device. They should clean all the things.
4210 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4213 * Flush the unicast and multicast chains
4215 dev_addr_discard(dev);
4217 if (dev->netdev_ops->ndo_uninit)
4218 dev->netdev_ops->ndo_uninit(dev);
4220 /* Notifier chain MUST detach us from master device. */
4221 WARN_ON(dev->master);
4223 /* Remove entries from kobject tree */
4224 netdev_unregister_kobject(dev);
4231 static void __netdev_init_queue_locks_one(struct net_device *dev,
4232 struct netdev_queue *dev_queue,
4235 spin_lock_init(&dev_queue->_xmit_lock);
4236 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4237 dev_queue->xmit_lock_owner = -1;
4240 static void netdev_init_queue_locks(struct net_device *dev)
4242 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4243 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4246 unsigned long netdev_fix_features(unsigned long features, const char *name)
4248 /* Fix illegal SG+CSUM combinations. */
4249 if ((features & NETIF_F_SG) &&
4250 !(features & NETIF_F_ALL_CSUM)) {
4252 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4253 "checksum feature.\n", name);
4254 features &= ~NETIF_F_SG;
4257 /* TSO requires that SG is present as well. */
4258 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4260 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4261 "SG feature.\n", name);
4262 features &= ~NETIF_F_TSO;
4265 if (features & NETIF_F_UFO) {
4266 if (!(features & NETIF_F_GEN_CSUM)) {
4268 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4269 "since no NETIF_F_HW_CSUM feature.\n",
4271 features &= ~NETIF_F_UFO;
4274 if (!(features & NETIF_F_SG)) {
4276 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4277 "since no NETIF_F_SG feature.\n", name);
4278 features &= ~NETIF_F_UFO;
4284 EXPORT_SYMBOL(netdev_fix_features);
4286 /* Some devices need to (re-)set their netdev_ops inside
4287 * ->init() or similar. If that happens, we have to setup
4288 * the compat pointers again.
4290 void netdev_resync_ops(struct net_device *dev)
4292 #ifdef CONFIG_COMPAT_NET_DEV_OPS
4293 const struct net_device_ops *ops = dev->netdev_ops;
4295 dev->init = ops->ndo_init;
4296 dev->uninit = ops->ndo_uninit;
4297 dev->open = ops->ndo_open;
4298 dev->change_rx_flags = ops->ndo_change_rx_flags;
4299 dev->set_rx_mode = ops->ndo_set_rx_mode;
4300 dev->set_multicast_list = ops->ndo_set_multicast_list;
4301 dev->set_mac_address = ops->ndo_set_mac_address;
4302 dev->validate_addr = ops->ndo_validate_addr;
4303 dev->do_ioctl = ops->ndo_do_ioctl;
4304 dev->set_config = ops->ndo_set_config;
4305 dev->change_mtu = ops->ndo_change_mtu;
4306 dev->neigh_setup = ops->ndo_neigh_setup;
4307 dev->tx_timeout = ops->ndo_tx_timeout;
4308 dev->get_stats = ops->ndo_get_stats;
4309 dev->vlan_rx_register = ops->ndo_vlan_rx_register;
4310 dev->vlan_rx_add_vid = ops->ndo_vlan_rx_add_vid;
4311 dev->vlan_rx_kill_vid = ops->ndo_vlan_rx_kill_vid;
4312 #ifdef CONFIG_NET_POLL_CONTROLLER
4313 dev->poll_controller = ops->ndo_poll_controller;
4317 EXPORT_SYMBOL(netdev_resync_ops);
4320 * register_netdevice - register a network device
4321 * @dev: device to register
4323 * Take a completed network device structure and add it to the kernel
4324 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4325 * chain. 0 is returned on success. A negative errno code is returned
4326 * on a failure to set up the device, or if the name is a duplicate.
4328 * Callers must hold the rtnl semaphore. You may want
4329 * register_netdev() instead of this.
4332 * The locking appears insufficient to guarantee two parallel registers
4333 * will not get the same name.
4336 int register_netdevice(struct net_device *dev)
4338 struct hlist_head *head;
4339 struct hlist_node *p;
4341 struct net *net = dev_net(dev);
4343 BUG_ON(dev_boot_phase);
4348 /* When net_device's are persistent, this will be fatal. */
4349 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4352 spin_lock_init(&dev->addr_list_lock);
4353 netdev_set_addr_lockdep_class(dev);
4354 netdev_init_queue_locks(dev);
4358 #ifdef CONFIG_COMPAT_NET_DEV_OPS
4359 /* Netdevice_ops API compatiability support.
4360 * This is temporary until all network devices are converted.
4362 if (dev->netdev_ops) {
4363 netdev_resync_ops(dev);
4365 char drivername[64];
4366 pr_info("%s (%s): not using net_device_ops yet\n",
4367 dev->name, netdev_drivername(dev, drivername, 64));
4369 /* This works only because net_device_ops and the
4370 compatiablity structure are the same. */
4371 dev->netdev_ops = (void *) &(dev->init);
4375 /* Init, if this function is available */
4376 if (dev->netdev_ops->ndo_init) {
4377 ret = dev->netdev_ops->ndo_init(dev);
4385 if (!dev_valid_name(dev->name)) {
4390 dev->ifindex = dev_new_index(net);
4391 if (dev->iflink == -1)
4392 dev->iflink = dev->ifindex;
4394 /* Check for existence of name */
4395 head = dev_name_hash(net, dev->name);
4396 hlist_for_each(p, head) {
4397 struct net_device *d
4398 = hlist_entry(p, struct net_device, name_hlist);
4399 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
4405 /* Fix illegal checksum combinations */
4406 if ((dev->features & NETIF_F_HW_CSUM) &&
4407 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4408 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4410 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4413 if ((dev->features & NETIF_F_NO_CSUM) &&
4414 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4415 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4417 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4420 dev->features = netdev_fix_features(dev->features, dev->name);
4422 /* Enable software GSO if SG is supported. */
4423 if (dev->features & NETIF_F_SG)
4424 dev->features |= NETIF_F_GSO;
4426 netdev_initialize_kobject(dev);
4427 ret = netdev_register_kobject(dev);
4430 dev->reg_state = NETREG_REGISTERED;
4433 * Default initial state at registry is that the
4434 * device is present.
4437 set_bit(__LINK_STATE_PRESENT, &dev->state);
4439 dev_init_scheduler(dev);
4441 list_netdevice(dev);
4443 /* Notify protocols, that a new device appeared. */
4444 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4445 ret = notifier_to_errno(ret);
4447 rollback_registered(dev);
4448 dev->reg_state = NETREG_UNREGISTERED;
4455 if (dev->netdev_ops->ndo_uninit)
4456 dev->netdev_ops->ndo_uninit(dev);
4461 * init_dummy_netdev - init a dummy network device for NAPI
4462 * @dev: device to init
4464 * This takes a network device structure and initialize the minimum
4465 * amount of fields so it can be used to schedule NAPI polls without
4466 * registering a full blown interface. This is to be used by drivers
4467 * that need to tie several hardware interfaces to a single NAPI
4468 * poll scheduler due to HW limitations.
4470 int init_dummy_netdev(struct net_device *dev)
4472 /* Clear everything. Note we don't initialize spinlocks
4473 * are they aren't supposed to be taken by any of the
4474 * NAPI code and this dummy netdev is supposed to be
4475 * only ever used for NAPI polls
4477 memset(dev, 0, sizeof(struct net_device));
4479 /* make sure we BUG if trying to hit standard
4480 * register/unregister code path
4482 dev->reg_state = NETREG_DUMMY;
4484 /* initialize the ref count */
4485 atomic_set(&dev->refcnt, 1);
4487 /* NAPI wants this */
4488 INIT_LIST_HEAD(&dev->napi_list);
4490 /* a dummy interface is started by default */
4491 set_bit(__LINK_STATE_PRESENT, &dev->state);
4492 set_bit(__LINK_STATE_START, &dev->state);
4496 EXPORT_SYMBOL_GPL(init_dummy_netdev);
4500 * register_netdev - register a network device
4501 * @dev: device to register
4503 * Take a completed network device structure and add it to the kernel
4504 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4505 * chain. 0 is returned on success. A negative errno code is returned
4506 * on a failure to set up the device, or if the name is a duplicate.
4508 * This is a wrapper around register_netdevice that takes the rtnl semaphore
4509 * and expands the device name if you passed a format string to
4512 int register_netdev(struct net_device *dev)
4519 * If the name is a format string the caller wants us to do a
4522 if (strchr(dev->name, '%')) {
4523 err = dev_alloc_name(dev, dev->name);
4528 err = register_netdevice(dev);
4533 EXPORT_SYMBOL(register_netdev);
4536 * netdev_wait_allrefs - wait until all references are gone.
4538 * This is called when unregistering network devices.
4540 * Any protocol or device that holds a reference should register
4541 * for netdevice notification, and cleanup and put back the
4542 * reference if they receive an UNREGISTER event.
4543 * We can get stuck here if buggy protocols don't correctly
4546 static void netdev_wait_allrefs(struct net_device *dev)
4548 unsigned long rebroadcast_time, warning_time;
4550 rebroadcast_time = warning_time = jiffies;
4551 while (atomic_read(&dev->refcnt) != 0) {
4552 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
4555 /* Rebroadcast unregister notification */
4556 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4558 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
4560 /* We must not have linkwatch events
4561 * pending on unregister. If this
4562 * happens, we simply run the queue
4563 * unscheduled, resulting in a noop
4566 linkwatch_run_queue();
4571 rebroadcast_time = jiffies;
4576 if (time_after(jiffies, warning_time + 10 * HZ)) {
4577 printk(KERN_EMERG "unregister_netdevice: "
4578 "waiting for %s to become free. Usage "
4580 dev->name, atomic_read(&dev->refcnt));
4581 warning_time = jiffies;
4590 * register_netdevice(x1);
4591 * register_netdevice(x2);
4593 * unregister_netdevice(y1);
4594 * unregister_netdevice(y2);
4600 * We are invoked by rtnl_unlock().
4601 * This allows us to deal with problems:
4602 * 1) We can delete sysfs objects which invoke hotplug
4603 * without deadlocking with linkwatch via keventd.
4604 * 2) Since we run with the RTNL semaphore not held, we can sleep
4605 * safely in order to wait for the netdev refcnt to drop to zero.
4607 * We must not return until all unregister events added during
4608 * the interval the lock was held have been completed.
4610 void netdev_run_todo(void)
4612 struct list_head list;
4614 /* Snapshot list, allow later requests */
4615 list_replace_init(&net_todo_list, &list);
4619 while (!list_empty(&list)) {
4620 struct net_device *dev
4621 = list_entry(list.next, struct net_device, todo_list);
4622 list_del(&dev->todo_list);
4624 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
4625 printk(KERN_ERR "network todo '%s' but state %d\n",
4626 dev->name, dev->reg_state);
4631 dev->reg_state = NETREG_UNREGISTERED;
4633 on_each_cpu(flush_backlog, dev, 1);
4635 netdev_wait_allrefs(dev);
4638 BUG_ON(atomic_read(&dev->refcnt));
4639 WARN_ON(dev->ip_ptr);
4640 WARN_ON(dev->ip6_ptr);
4641 WARN_ON(dev->dn_ptr);
4643 if (dev->destructor)
4644 dev->destructor(dev);
4646 /* Free network device */
4647 kobject_put(&dev->dev.kobj);
4652 * dev_get_stats - get network device statistics
4653 * @dev: device to get statistics from
4655 * Get network statistics from device. The device driver may provide
4656 * its own method by setting dev->netdev_ops->get_stats; otherwise
4657 * the internal statistics structure is used.
4659 const struct net_device_stats *dev_get_stats(struct net_device *dev)
4661 const struct net_device_ops *ops = dev->netdev_ops;
4663 if (ops->ndo_get_stats)
4664 return ops->ndo_get_stats(dev);
4668 EXPORT_SYMBOL(dev_get_stats);
4670 static void netdev_init_one_queue(struct net_device *dev,
4671 struct netdev_queue *queue,
4677 static void netdev_init_queues(struct net_device *dev)
4679 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
4680 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
4681 spin_lock_init(&dev->tx_global_lock);
4685 * alloc_netdev_mq - allocate network device
4686 * @sizeof_priv: size of private data to allocate space for
4687 * @name: device name format string
4688 * @setup: callback to initialize device
4689 * @queue_count: the number of subqueues to allocate
4691 * Allocates a struct net_device with private data area for driver use
4692 * and performs basic initialization. Also allocates subquue structs
4693 * for each queue on the device at the end of the netdevice.
4695 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
4696 void (*setup)(struct net_device *), unsigned int queue_count)
4698 struct netdev_queue *tx;
4699 struct net_device *dev;
4703 BUG_ON(strlen(name) >= sizeof(dev->name));
4705 alloc_size = sizeof(struct net_device);
4707 /* ensure 32-byte alignment of private area */
4708 alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
4709 alloc_size += sizeof_priv;
4711 /* ensure 32-byte alignment of whole construct */
4712 alloc_size += NETDEV_ALIGN_CONST;
4714 p = kzalloc(alloc_size, GFP_KERNEL);
4716 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
4720 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
4722 printk(KERN_ERR "alloc_netdev: Unable to allocate "
4728 dev = (struct net_device *)
4729 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4730 dev->padded = (char *)dev - (char *)p;
4731 dev_net_set(dev, &init_net);
4734 dev->num_tx_queues = queue_count;
4735 dev->real_num_tx_queues = queue_count;
4737 dev->gso_max_size = GSO_MAX_SIZE;
4739 netdev_init_queues(dev);
4741 INIT_LIST_HEAD(&dev->napi_list);
4743 strcpy(dev->name, name);
4746 EXPORT_SYMBOL(alloc_netdev_mq);
4749 * free_netdev - free network device
4752 * This function does the last stage of destroying an allocated device
4753 * interface. The reference to the device object is released.
4754 * If this is the last reference then it will be freed.
4756 void free_netdev(struct net_device *dev)
4758 struct napi_struct *p, *n;
4760 release_net(dev_net(dev));
4764 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
4767 /* Compatibility with error handling in drivers */
4768 if (dev->reg_state == NETREG_UNINITIALIZED) {
4769 kfree((char *)dev - dev->padded);
4773 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
4774 dev->reg_state = NETREG_RELEASED;
4776 /* will free via device release */
4777 put_device(&dev->dev);
4781 * synchronize_net - Synchronize with packet receive processing
4783 * Wait for packets currently being received to be done.
4784 * Does not block later packets from starting.
4786 void synchronize_net(void)
4793 * unregister_netdevice - remove device from the kernel
4796 * This function shuts down a device interface and removes it
4797 * from the kernel tables.
4799 * Callers must hold the rtnl semaphore. You may want
4800 * unregister_netdev() instead of this.
4803 void unregister_netdevice(struct net_device *dev)
4807 rollback_registered(dev);
4808 /* Finish processing unregister after unlock */
4813 * unregister_netdev - remove device from the kernel
4816 * This function shuts down a device interface and removes it
4817 * from the kernel tables.
4819 * This is just a wrapper for unregister_netdevice that takes
4820 * the rtnl semaphore. In general you want to use this and not
4821 * unregister_netdevice.
4823 void unregister_netdev(struct net_device *dev)
4826 unregister_netdevice(dev);
4830 EXPORT_SYMBOL(unregister_netdev);
4833 * dev_change_net_namespace - move device to different nethost namespace
4835 * @net: network namespace
4836 * @pat: If not NULL name pattern to try if the current device name
4837 * is already taken in the destination network namespace.
4839 * This function shuts down a device interface and moves it
4840 * to a new network namespace. On success 0 is returned, on
4841 * a failure a netagive errno code is returned.
4843 * Callers must hold the rtnl semaphore.
4846 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
4849 const char *destname;
4854 /* Don't allow namespace local devices to be moved. */
4856 if (dev->features & NETIF_F_NETNS_LOCAL)
4860 /* Don't allow real devices to be moved when sysfs
4864 if (dev->dev.parent)
4868 /* Ensure the device has been registrered */
4870 if (dev->reg_state != NETREG_REGISTERED)
4873 /* Get out if there is nothing todo */
4875 if (net_eq(dev_net(dev), net))
4878 /* Pick the destination device name, and ensure
4879 * we can use it in the destination network namespace.
4882 destname = dev->name;
4883 if (__dev_get_by_name(net, destname)) {
4884 /* We get here if we can't use the current device name */
4887 if (!dev_valid_name(pat))
4889 if (strchr(pat, '%')) {
4890 if (__dev_alloc_name(net, pat, buf) < 0)
4895 if (__dev_get_by_name(net, destname))
4900 * And now a mini version of register_netdevice unregister_netdevice.
4903 /* If device is running close it first. */
4906 /* And unlink it from device chain */
4908 unlist_netdevice(dev);
4912 /* Shutdown queueing discipline. */
4915 /* Notify protocols, that we are about to destroy
4916 this device. They should clean all the things.
4918 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4921 * Flush the unicast and multicast chains
4923 dev_addr_discard(dev);
4925 netdev_unregister_kobject(dev);
4927 /* Actually switch the network namespace */
4928 dev_net_set(dev, net);
4930 /* Assign the new device name */
4931 if (destname != dev->name)
4932 strcpy(dev->name, destname);
4934 /* If there is an ifindex conflict assign a new one */
4935 if (__dev_get_by_index(net, dev->ifindex)) {
4936 int iflink = (dev->iflink == dev->ifindex);
4937 dev->ifindex = dev_new_index(net);
4939 dev->iflink = dev->ifindex;
4942 /* Fixup kobjects */
4943 err = netdev_register_kobject(dev);
4946 /* Add the device back in the hashes */
4947 list_netdevice(dev);
4949 /* Notify protocols, that a new device appeared. */
4950 call_netdevice_notifiers(NETDEV_REGISTER, dev);
4958 static int dev_cpu_callback(struct notifier_block *nfb,
4959 unsigned long action,
4962 struct sk_buff **list_skb;
4963 struct Qdisc **list_net;
4964 struct sk_buff *skb;
4965 unsigned int cpu, oldcpu = (unsigned long)ocpu;
4966 struct softnet_data *sd, *oldsd;
4968 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
4971 local_irq_disable();
4972 cpu = smp_processor_id();
4973 sd = &per_cpu(softnet_data, cpu);
4974 oldsd = &per_cpu(softnet_data, oldcpu);
4976 /* Find end of our completion_queue. */
4977 list_skb = &sd->completion_queue;
4979 list_skb = &(*list_skb)->next;
4980 /* Append completion queue from offline CPU. */
4981 *list_skb = oldsd->completion_queue;
4982 oldsd->completion_queue = NULL;
4984 /* Find end of our output_queue. */
4985 list_net = &sd->output_queue;
4987 list_net = &(*list_net)->next_sched;
4988 /* Append output queue from offline CPU. */
4989 *list_net = oldsd->output_queue;
4990 oldsd->output_queue = NULL;
4992 raise_softirq_irqoff(NET_TX_SOFTIRQ);
4995 /* Process offline CPU's input_pkt_queue */
4996 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
5004 * netdev_increment_features - increment feature set by one
5005 * @all: current feature set
5006 * @one: new feature set
5007 * @mask: mask feature set
5009 * Computes a new feature set after adding a device with feature set
5010 * @one to the master device with current feature set @all. Will not
5011 * enable anything that is off in @mask. Returns the new feature set.
5013 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5016 /* If device needs checksumming, downgrade to it. */
5017 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5018 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5019 else if (mask & NETIF_F_ALL_CSUM) {
5020 /* If one device supports v4/v6 checksumming, set for all. */
5021 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5022 !(all & NETIF_F_GEN_CSUM)) {
5023 all &= ~NETIF_F_ALL_CSUM;
5024 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5027 /* If one device supports hw checksumming, set for all. */
5028 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5029 all &= ~NETIF_F_ALL_CSUM;
5030 all |= NETIF_F_HW_CSUM;
5034 one |= NETIF_F_ALL_CSUM;
5036 one |= all & NETIF_F_ONE_FOR_ALL;
5037 all &= one | NETIF_F_LLTX | NETIF_F_GSO;
5038 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5042 EXPORT_SYMBOL(netdev_increment_features);
5044 static struct hlist_head *netdev_create_hash(void)
5047 struct hlist_head *hash;
5049 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5051 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5052 INIT_HLIST_HEAD(&hash[i]);
5057 /* Initialize per network namespace state */
5058 static int __net_init netdev_init(struct net *net)
5060 INIT_LIST_HEAD(&net->dev_base_head);
5062 net->dev_name_head = netdev_create_hash();
5063 if (net->dev_name_head == NULL)
5066 net->dev_index_head = netdev_create_hash();
5067 if (net->dev_index_head == NULL)
5073 kfree(net->dev_name_head);
5079 * netdev_drivername - network driver for the device
5080 * @dev: network device
5081 * @buffer: buffer for resulting name
5082 * @len: size of buffer
5084 * Determine network driver for device.
5086 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5088 const struct device_driver *driver;
5089 const struct device *parent;
5091 if (len <= 0 || !buffer)
5095 parent = dev->dev.parent;
5100 driver = parent->driver;
5101 if (driver && driver->name)
5102 strlcpy(buffer, driver->name, len);
5106 static void __net_exit netdev_exit(struct net *net)
5108 kfree(net->dev_name_head);
5109 kfree(net->dev_index_head);
5112 static struct pernet_operations __net_initdata netdev_net_ops = {
5113 .init = netdev_init,
5114 .exit = netdev_exit,
5117 static void __net_exit default_device_exit(struct net *net)
5119 struct net_device *dev;
5121 * Push all migratable of the network devices back to the
5122 * initial network namespace
5126 for_each_netdev(net, dev) {
5128 char fb_name[IFNAMSIZ];
5130 /* Ignore unmoveable devices (i.e. loopback) */
5131 if (dev->features & NETIF_F_NETNS_LOCAL)
5134 /* Delete virtual devices */
5135 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) {
5136 dev->rtnl_link_ops->dellink(dev);
5140 /* Push remaing network devices to init_net */
5141 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5142 err = dev_change_net_namespace(dev, &init_net, fb_name);
5144 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5145 __func__, dev->name, err);
5153 static struct pernet_operations __net_initdata default_device_ops = {
5154 .exit = default_device_exit,
5158 * Initialize the DEV module. At boot time this walks the device list and
5159 * unhooks any devices that fail to initialise (normally hardware not
5160 * present) and leaves us with a valid list of present and active devices.
5165 * This is called single threaded during boot, so no need
5166 * to take the rtnl semaphore.
5168 static int __init net_dev_init(void)
5170 int i, rc = -ENOMEM;
5172 BUG_ON(!dev_boot_phase);
5174 if (dev_proc_init())
5177 if (netdev_kobject_init())
5180 INIT_LIST_HEAD(&ptype_all);
5181 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5182 INIT_LIST_HEAD(&ptype_base[i]);
5184 if (register_pernet_subsys(&netdev_net_ops))
5188 * Initialise the packet receive queues.
5191 for_each_possible_cpu(i) {
5192 struct softnet_data *queue;
5194 queue = &per_cpu(softnet_data, i);
5195 skb_queue_head_init(&queue->input_pkt_queue);
5196 queue->completion_queue = NULL;
5197 INIT_LIST_HEAD(&queue->poll_list);
5199 queue->backlog.poll = process_backlog;
5200 queue->backlog.weight = weight_p;
5201 queue->backlog.gro_list = NULL;
5206 /* The loopback device is special if any other network devices
5207 * is present in a network namespace the loopback device must
5208 * be present. Since we now dynamically allocate and free the
5209 * loopback device ensure this invariant is maintained by
5210 * keeping the loopback device as the first device on the
5211 * list of network devices. Ensuring the loopback devices
5212 * is the first device that appears and the last network device
5215 if (register_pernet_device(&loopback_net_ops))
5218 if (register_pernet_device(&default_device_ops))
5221 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5222 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5224 hotcpu_notifier(dev_cpu_callback, 0);
5232 subsys_initcall(net_dev_init);
5234 EXPORT_SYMBOL(__dev_get_by_index);
5235 EXPORT_SYMBOL(__dev_get_by_name);
5236 EXPORT_SYMBOL(__dev_remove_pack);
5237 EXPORT_SYMBOL(dev_valid_name);
5238 EXPORT_SYMBOL(dev_add_pack);
5239 EXPORT_SYMBOL(dev_alloc_name);
5240 EXPORT_SYMBOL(dev_close);
5241 EXPORT_SYMBOL(dev_get_by_flags);
5242 EXPORT_SYMBOL(dev_get_by_index);
5243 EXPORT_SYMBOL(dev_get_by_name);
5244 EXPORT_SYMBOL(dev_open);
5245 EXPORT_SYMBOL(dev_queue_xmit);
5246 EXPORT_SYMBOL(dev_remove_pack);
5247 EXPORT_SYMBOL(dev_set_allmulti);
5248 EXPORT_SYMBOL(dev_set_promiscuity);
5249 EXPORT_SYMBOL(dev_change_flags);
5250 EXPORT_SYMBOL(dev_set_mtu);
5251 EXPORT_SYMBOL(dev_set_mac_address);
5252 EXPORT_SYMBOL(free_netdev);
5253 EXPORT_SYMBOL(netdev_boot_setup_check);
5254 EXPORT_SYMBOL(netdev_set_master);
5255 EXPORT_SYMBOL(netdev_state_change);
5256 EXPORT_SYMBOL(netif_receive_skb);
5257 EXPORT_SYMBOL(netif_rx);
5258 EXPORT_SYMBOL(register_gifconf);
5259 EXPORT_SYMBOL(register_netdevice);
5260 EXPORT_SYMBOL(register_netdevice_notifier);
5261 EXPORT_SYMBOL(skb_checksum_help);
5262 EXPORT_SYMBOL(synchronize_net);
5263 EXPORT_SYMBOL(unregister_netdevice);
5264 EXPORT_SYMBOL(unregister_netdevice_notifier);
5265 EXPORT_SYMBOL(net_enable_timestamp);
5266 EXPORT_SYMBOL(net_disable_timestamp);
5267 EXPORT_SYMBOL(dev_get_flags);
5269 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
5270 EXPORT_SYMBOL(br_handle_frame_hook);
5271 EXPORT_SYMBOL(br_fdb_get_hook);
5272 EXPORT_SYMBOL(br_fdb_put_hook);
5275 EXPORT_SYMBOL(dev_load);
5277 EXPORT_PER_CPU_SYMBOL(softnet_data);