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)
147 * The list of packet types we will receive (as opposed to discard)
148 * and the routines to invoke.
150 * Why 16. Because with 16 the only overlap we get on a hash of the
151 * low nibble of the protocol value is RARP/SNAP/X.25.
153 * NOTE: That is no longer true with the addition of VLAN tags. Not
154 * sure which should go first, but I bet it won't make much
155 * difference if we are running VLANs. The good news is that
156 * this protocol won't be in the list unless compiled in, so
157 * the average user (w/out VLANs) will not be adversely affected.
174 #define PTYPE_HASH_SIZE (16)
175 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
177 static DEFINE_SPINLOCK(ptype_lock);
178 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
179 static struct list_head ptype_all __read_mostly; /* Taps */
182 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
185 * Pure readers hold dev_base_lock for reading.
187 * Writers must hold the rtnl semaphore while they loop through the
188 * dev_base_head list, and hold dev_base_lock for writing when they do the
189 * actual updates. This allows pure readers to access the list even
190 * while a writer is preparing to update it.
192 * To put it another way, dev_base_lock is held for writing only to
193 * protect against pure readers; the rtnl semaphore provides the
194 * protection against other writers.
196 * See, for example usages, register_netdevice() and
197 * unregister_netdevice(), which must be called with the rtnl
200 DEFINE_RWLOCK(dev_base_lock);
202 EXPORT_SYMBOL(dev_base_lock);
204 #define NETDEV_HASHBITS 8
205 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
207 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
209 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
210 return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
213 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
215 return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
218 /* Device list insertion */
219 static int list_netdevice(struct net_device *dev)
221 struct net *net = dev_net(dev);
225 write_lock_bh(&dev_base_lock);
226 list_add_tail(&dev->dev_list, &net->dev_base_head);
227 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
228 hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
229 write_unlock_bh(&dev_base_lock);
233 /* Device list removal */
234 static void unlist_netdevice(struct net_device *dev)
238 /* Unlink dev from the device chain */
239 write_lock_bh(&dev_base_lock);
240 list_del(&dev->dev_list);
241 hlist_del(&dev->name_hlist);
242 hlist_del(&dev->index_hlist);
243 write_unlock_bh(&dev_base_lock);
250 static RAW_NOTIFIER_HEAD(netdev_chain);
253 * Device drivers call our routines to queue packets here. We empty the
254 * queue in the local softnet handler.
257 DEFINE_PER_CPU(struct softnet_data, softnet_data);
259 #ifdef CONFIG_LOCKDEP
261 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
262 * according to dev->type
264 static const unsigned short netdev_lock_type[] =
265 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
266 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
267 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
268 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
269 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
270 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
271 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
272 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
273 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
274 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
275 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
276 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
277 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
278 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
279 ARPHRD_PHONET_PIPE, ARPHRD_VOID, ARPHRD_NONE};
281 static const char *netdev_lock_name[] =
282 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
283 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
284 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
285 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
286 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
287 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
288 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
289 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
290 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
291 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
292 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
293 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
294 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
295 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
296 "_xmit_PHONET_PIPE", "_xmit_VOID", "_xmit_NONE"};
298 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
299 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
301 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
305 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
306 if (netdev_lock_type[i] == dev_type)
308 /* the last key is used by default */
309 return ARRAY_SIZE(netdev_lock_type) - 1;
312 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
313 unsigned short dev_type)
317 i = netdev_lock_pos(dev_type);
318 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
319 netdev_lock_name[i]);
322 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
326 i = netdev_lock_pos(dev->type);
327 lockdep_set_class_and_name(&dev->addr_list_lock,
328 &netdev_addr_lock_key[i],
329 netdev_lock_name[i]);
332 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
333 unsigned short dev_type)
336 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
341 /*******************************************************************************
343 Protocol management and registration routines
345 *******************************************************************************/
348 * Add a protocol ID to the list. Now that the input handler is
349 * smarter we can dispense with all the messy stuff that used to be
352 * BEWARE!!! Protocol handlers, mangling input packets,
353 * MUST BE last in hash buckets and checking protocol handlers
354 * MUST start from promiscuous ptype_all chain in net_bh.
355 * It is true now, do not change it.
356 * Explanation follows: if protocol handler, mangling packet, will
357 * be the first on list, it is not able to sense, that packet
358 * is cloned and should be copied-on-write, so that it will
359 * change it and subsequent readers will get broken packet.
364 * dev_add_pack - add packet handler
365 * @pt: packet type declaration
367 * Add a protocol handler to the networking stack. The passed &packet_type
368 * is linked into kernel lists and may not be freed until it has been
369 * removed from the kernel lists.
371 * This call does not sleep therefore it can not
372 * guarantee all CPU's that are in middle of receiving packets
373 * will see the new packet type (until the next received packet).
376 void dev_add_pack(struct packet_type *pt)
380 spin_lock_bh(&ptype_lock);
381 if (pt->type == htons(ETH_P_ALL))
382 list_add_rcu(&pt->list, &ptype_all);
384 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
385 list_add_rcu(&pt->list, &ptype_base[hash]);
387 spin_unlock_bh(&ptype_lock);
391 * __dev_remove_pack - remove packet handler
392 * @pt: packet type declaration
394 * Remove a protocol handler that was previously added to the kernel
395 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
396 * from the kernel lists and can be freed or reused once this function
399 * The packet type might still be in use by receivers
400 * and must not be freed until after all the CPU's have gone
401 * through a quiescent state.
403 void __dev_remove_pack(struct packet_type *pt)
405 struct list_head *head;
406 struct packet_type *pt1;
408 spin_lock_bh(&ptype_lock);
410 if (pt->type == htons(ETH_P_ALL))
413 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
415 list_for_each_entry(pt1, head, list) {
417 list_del_rcu(&pt->list);
422 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
424 spin_unlock_bh(&ptype_lock);
427 * dev_remove_pack - remove packet handler
428 * @pt: packet type declaration
430 * Remove a protocol handler that was previously added to the kernel
431 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
432 * from the kernel lists and can be freed or reused once this function
435 * This call sleeps to guarantee that no CPU is looking at the packet
438 void dev_remove_pack(struct packet_type *pt)
440 __dev_remove_pack(pt);
445 /******************************************************************************
447 Device Boot-time Settings Routines
449 *******************************************************************************/
451 /* Boot time configuration table */
452 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
455 * netdev_boot_setup_add - add new setup entry
456 * @name: name of the device
457 * @map: configured settings for the device
459 * Adds new setup entry to the dev_boot_setup list. The function
460 * returns 0 on error and 1 on success. This is a generic routine to
463 static int netdev_boot_setup_add(char *name, struct ifmap *map)
465 struct netdev_boot_setup *s;
469 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
470 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
471 memset(s[i].name, 0, sizeof(s[i].name));
472 strlcpy(s[i].name, name, IFNAMSIZ);
473 memcpy(&s[i].map, map, sizeof(s[i].map));
478 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
482 * netdev_boot_setup_check - check boot time settings
483 * @dev: the netdevice
485 * Check boot time settings for the device.
486 * The found settings are set for the device to be used
487 * later in the device probing.
488 * Returns 0 if no settings found, 1 if they are.
490 int netdev_boot_setup_check(struct net_device *dev)
492 struct netdev_boot_setup *s = dev_boot_setup;
495 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
496 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
497 !strcmp(dev->name, s[i].name)) {
498 dev->irq = s[i].map.irq;
499 dev->base_addr = s[i].map.base_addr;
500 dev->mem_start = s[i].map.mem_start;
501 dev->mem_end = s[i].map.mem_end;
510 * netdev_boot_base - get address from boot time settings
511 * @prefix: prefix for network device
512 * @unit: id for network device
514 * Check boot time settings for the base address of device.
515 * The found settings are set for the device to be used
516 * later in the device probing.
517 * Returns 0 if no settings found.
519 unsigned long netdev_boot_base(const char *prefix, int unit)
521 const struct netdev_boot_setup *s = dev_boot_setup;
525 sprintf(name, "%s%d", prefix, unit);
528 * If device already registered then return base of 1
529 * to indicate not to probe for this interface
531 if (__dev_get_by_name(&init_net, name))
534 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
535 if (!strcmp(name, s[i].name))
536 return s[i].map.base_addr;
541 * Saves at boot time configured settings for any netdevice.
543 int __init netdev_boot_setup(char *str)
548 str = get_options(str, ARRAY_SIZE(ints), ints);
553 memset(&map, 0, sizeof(map));
557 map.base_addr = ints[2];
559 map.mem_start = ints[3];
561 map.mem_end = ints[4];
563 /* Add new entry to the list */
564 return netdev_boot_setup_add(str, &map);
567 __setup("netdev=", netdev_boot_setup);
569 /*******************************************************************************
571 Device Interface Subroutines
573 *******************************************************************************/
576 * __dev_get_by_name - find a device by its name
577 * @net: the applicable net namespace
578 * @name: name to find
580 * Find an interface by name. Must be called under RTNL semaphore
581 * or @dev_base_lock. If the name is found a pointer to the device
582 * is returned. If the name is not found then %NULL is returned. The
583 * reference counters are not incremented so the caller must be
584 * careful with locks.
587 struct net_device *__dev_get_by_name(struct net *net, const char *name)
589 struct hlist_node *p;
591 hlist_for_each(p, dev_name_hash(net, name)) {
592 struct net_device *dev
593 = hlist_entry(p, struct net_device, name_hlist);
594 if (!strncmp(dev->name, name, IFNAMSIZ))
601 * dev_get_by_name - find a device by its name
602 * @net: the applicable net namespace
603 * @name: name to find
605 * Find an interface by name. This can be called from any
606 * context and does its own locking. The returned handle has
607 * the usage count incremented and the caller must use dev_put() to
608 * release it when it is no longer needed. %NULL is returned if no
609 * matching device is found.
612 struct net_device *dev_get_by_name(struct net *net, const char *name)
614 struct net_device *dev;
616 read_lock(&dev_base_lock);
617 dev = __dev_get_by_name(net, name);
620 read_unlock(&dev_base_lock);
625 * __dev_get_by_index - find a device by its ifindex
626 * @net: the applicable net namespace
627 * @ifindex: index of device
629 * Search for an interface by index. Returns %NULL if the device
630 * is not found or a pointer to the device. The device has not
631 * had its reference counter increased so the caller must be careful
632 * about locking. The caller must hold either the RTNL semaphore
636 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
638 struct hlist_node *p;
640 hlist_for_each(p, dev_index_hash(net, ifindex)) {
641 struct net_device *dev
642 = hlist_entry(p, struct net_device, index_hlist);
643 if (dev->ifindex == ifindex)
651 * dev_get_by_index - find a device by its ifindex
652 * @net: the applicable net namespace
653 * @ifindex: index of device
655 * Search for an interface by index. Returns NULL if the device
656 * is not found or a pointer to the device. The device returned has
657 * had a reference added and the pointer is safe until the user calls
658 * dev_put to indicate they have finished with it.
661 struct net_device *dev_get_by_index(struct net *net, int ifindex)
663 struct net_device *dev;
665 read_lock(&dev_base_lock);
666 dev = __dev_get_by_index(net, ifindex);
669 read_unlock(&dev_base_lock);
674 * dev_getbyhwaddr - find a device by its hardware address
675 * @net: the applicable net namespace
676 * @type: media type of device
677 * @ha: hardware address
679 * Search for an interface by MAC address. Returns NULL if the device
680 * is not found or a pointer to the device. The caller must hold the
681 * rtnl semaphore. The returned device has not had its ref count increased
682 * and the caller must therefore be careful about locking
685 * If the API was consistent this would be __dev_get_by_hwaddr
688 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
690 struct net_device *dev;
694 for_each_netdev(net, dev)
695 if (dev->type == type &&
696 !memcmp(dev->dev_addr, ha, dev->addr_len))
702 EXPORT_SYMBOL(dev_getbyhwaddr);
704 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
706 struct net_device *dev;
709 for_each_netdev(net, dev)
710 if (dev->type == type)
716 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
718 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
720 struct net_device *dev;
723 dev = __dev_getfirstbyhwtype(net, type);
730 EXPORT_SYMBOL(dev_getfirstbyhwtype);
733 * dev_get_by_flags - find any device with given flags
734 * @net: the applicable net namespace
735 * @if_flags: IFF_* values
736 * @mask: bitmask of bits in if_flags to check
738 * Search for any interface with the given flags. Returns NULL if a device
739 * is not found or a pointer to the device. The device returned has
740 * had a reference added and the pointer is safe until the user calls
741 * dev_put to indicate they have finished with it.
744 struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
746 struct net_device *dev, *ret;
749 read_lock(&dev_base_lock);
750 for_each_netdev(net, dev) {
751 if (((dev->flags ^ if_flags) & mask) == 0) {
757 read_unlock(&dev_base_lock);
762 * dev_valid_name - check if name is okay for network device
765 * Network device names need to be valid file names to
766 * to allow sysfs to work. We also disallow any kind of
769 int dev_valid_name(const char *name)
773 if (strlen(name) >= IFNAMSIZ)
775 if (!strcmp(name, ".") || !strcmp(name, ".."))
779 if (*name == '/' || isspace(*name))
787 * __dev_alloc_name - allocate a name for a device
788 * @net: network namespace to allocate the device name in
789 * @name: name format string
790 * @buf: scratch buffer and result name string
792 * Passed a format string - eg "lt%d" it will try and find a suitable
793 * id. It scans list of devices to build up a free map, then chooses
794 * the first empty slot. The caller must hold the dev_base or rtnl lock
795 * while allocating the name and adding the device in order to avoid
797 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
798 * Returns the number of the unit assigned or a negative errno code.
801 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
805 const int max_netdevices = 8*PAGE_SIZE;
806 unsigned long *inuse;
807 struct net_device *d;
809 p = strnchr(name, IFNAMSIZ-1, '%');
812 * Verify the string as this thing may have come from
813 * the user. There must be either one "%d" and no other "%"
816 if (p[1] != 'd' || strchr(p + 2, '%'))
819 /* Use one page as a bit array of possible slots */
820 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
824 for_each_netdev(net, d) {
825 if (!sscanf(d->name, name, &i))
827 if (i < 0 || i >= max_netdevices)
830 /* avoid cases where sscanf is not exact inverse of printf */
831 snprintf(buf, IFNAMSIZ, name, i);
832 if (!strncmp(buf, d->name, IFNAMSIZ))
836 i = find_first_zero_bit(inuse, max_netdevices);
837 free_page((unsigned long) inuse);
840 snprintf(buf, IFNAMSIZ, name, i);
841 if (!__dev_get_by_name(net, buf))
844 /* It is possible to run out of possible slots
845 * when the name is long and there isn't enough space left
846 * for the digits, or if all bits are used.
852 * dev_alloc_name - allocate a name for a device
854 * @name: name format string
856 * Passed a format string - eg "lt%d" it will try and find a suitable
857 * id. It scans list of devices to build up a free map, then chooses
858 * the first empty slot. The caller must hold the dev_base or rtnl lock
859 * while allocating the name and adding the device in order to avoid
861 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
862 * Returns the number of the unit assigned or a negative errno code.
865 int dev_alloc_name(struct net_device *dev, const char *name)
871 BUG_ON(!dev_net(dev));
873 ret = __dev_alloc_name(net, name, buf);
875 strlcpy(dev->name, buf, IFNAMSIZ);
881 * dev_change_name - change name of a device
883 * @newname: name (or format string) must be at least IFNAMSIZ
885 * Change name of a device, can pass format strings "eth%d".
888 int dev_change_name(struct net_device *dev, const char *newname)
890 char oldname[IFNAMSIZ];
896 BUG_ON(!dev_net(dev));
899 if (dev->flags & IFF_UP)
902 if (!dev_valid_name(newname))
905 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
908 memcpy(oldname, dev->name, IFNAMSIZ);
910 if (strchr(newname, '%')) {
911 err = dev_alloc_name(dev, newname);
915 else if (__dev_get_by_name(net, newname))
918 strlcpy(dev->name, newname, IFNAMSIZ);
921 /* For now only devices in the initial network namespace
924 if (net == &init_net) {
925 ret = device_rename(&dev->dev, dev->name);
927 memcpy(dev->name, oldname, IFNAMSIZ);
932 write_lock_bh(&dev_base_lock);
933 hlist_del(&dev->name_hlist);
934 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
935 write_unlock_bh(&dev_base_lock);
937 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
938 ret = notifier_to_errno(ret);
943 "%s: name change rollback failed: %d.\n",
947 memcpy(dev->name, oldname, IFNAMSIZ);
956 * dev_set_alias - change ifalias of a device
958 * @alias: name up to IFALIASZ
959 * @len: limit of bytes to copy from info
961 * Set ifalias for a device,
963 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
978 dev->ifalias = krealloc(dev->ifalias, len+1, GFP_KERNEL);
982 strlcpy(dev->ifalias, alias, len+1);
988 * netdev_features_change - device changes features
989 * @dev: device to cause notification
991 * Called to indicate a device has changed features.
993 void netdev_features_change(struct net_device *dev)
995 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
997 EXPORT_SYMBOL(netdev_features_change);
1000 * netdev_state_change - device changes state
1001 * @dev: device to cause notification
1003 * Called to indicate a device has changed state. This function calls
1004 * the notifier chains for netdev_chain and sends a NEWLINK message
1005 * to the routing socket.
1007 void netdev_state_change(struct net_device *dev)
1009 if (dev->flags & IFF_UP) {
1010 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1011 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1015 void netdev_bonding_change(struct net_device *dev)
1017 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
1019 EXPORT_SYMBOL(netdev_bonding_change);
1022 * dev_load - load a network module
1023 * @net: the applicable net namespace
1024 * @name: name of interface
1026 * If a network interface is not present and the process has suitable
1027 * privileges this function loads the module. If module loading is not
1028 * available in this kernel then it becomes a nop.
1031 void dev_load(struct net *net, const char *name)
1033 struct net_device *dev;
1035 read_lock(&dev_base_lock);
1036 dev = __dev_get_by_name(net, name);
1037 read_unlock(&dev_base_lock);
1039 if (!dev && capable(CAP_SYS_MODULE))
1040 request_module("%s", name);
1044 * dev_open - prepare an interface for use.
1045 * @dev: device to open
1047 * Takes a device from down to up state. The device's private open
1048 * function is invoked and then the multicast lists are loaded. Finally
1049 * the device is moved into the up state and a %NETDEV_UP message is
1050 * sent to the netdev notifier chain.
1052 * Calling this function on an active interface is a nop. On a failure
1053 * a negative errno code is returned.
1055 int dev_open(struct net_device *dev)
1057 const struct net_device_ops *ops = dev->netdev_ops;
1066 if (dev->flags & IFF_UP)
1070 * Is it even present?
1072 if (!netif_device_present(dev))
1076 * Call device private open method
1078 set_bit(__LINK_STATE_START, &dev->state);
1080 if (ops->ndo_validate_addr)
1081 ret = ops->ndo_validate_addr(dev);
1083 if (!ret && ops->ndo_open)
1084 ret = ops->ndo_open(dev);
1087 * If it went open OK then:
1091 clear_bit(__LINK_STATE_START, &dev->state);
1096 dev->flags |= IFF_UP;
1101 net_dmaengine_get();
1104 * Initialize multicasting status
1106 dev_set_rx_mode(dev);
1109 * Wakeup transmit queue engine
1114 * ... and announce new interface.
1116 call_netdevice_notifiers(NETDEV_UP, dev);
1123 * dev_close - shutdown an interface.
1124 * @dev: device to shutdown
1126 * This function moves an active device into down state. A
1127 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1128 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1131 int dev_close(struct net_device *dev)
1133 const struct net_device_ops *ops = dev->netdev_ops;
1138 if (!(dev->flags & IFF_UP))
1142 * Tell people we are going down, so that they can
1143 * prepare to death, when device is still operating.
1145 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1147 clear_bit(__LINK_STATE_START, &dev->state);
1149 /* Synchronize to scheduled poll. We cannot touch poll list,
1150 * it can be even on different cpu. So just clear netif_running().
1152 * dev->stop() will invoke napi_disable() on all of it's
1153 * napi_struct instances on this device.
1155 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1157 dev_deactivate(dev);
1160 * Call the device specific close. This cannot fail.
1161 * Only if device is UP
1163 * We allow it to be called even after a DETACH hot-plug
1170 * Device is now down.
1173 dev->flags &= ~IFF_UP;
1176 * Tell people we are down
1178 call_netdevice_notifiers(NETDEV_DOWN, dev);
1183 net_dmaengine_put();
1190 * dev_disable_lro - disable Large Receive Offload on a device
1193 * Disable Large Receive Offload (LRO) on a net device. Must be
1194 * called under RTNL. This is needed if received packets may be
1195 * forwarded to another interface.
1197 void dev_disable_lro(struct net_device *dev)
1199 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1200 dev->ethtool_ops->set_flags) {
1201 u32 flags = dev->ethtool_ops->get_flags(dev);
1202 if (flags & ETH_FLAG_LRO) {
1203 flags &= ~ETH_FLAG_LRO;
1204 dev->ethtool_ops->set_flags(dev, flags);
1207 WARN_ON(dev->features & NETIF_F_LRO);
1209 EXPORT_SYMBOL(dev_disable_lro);
1212 static int dev_boot_phase = 1;
1215 * Device change register/unregister. These are not inline or static
1216 * as we export them to the world.
1220 * register_netdevice_notifier - register a network notifier block
1223 * Register a notifier to be called when network device events occur.
1224 * The notifier passed is linked into the kernel structures and must
1225 * not be reused until it has been unregistered. A negative errno code
1226 * is returned on a failure.
1228 * When registered all registration and up events are replayed
1229 * to the new notifier to allow device to have a race free
1230 * view of the network device list.
1233 int register_netdevice_notifier(struct notifier_block *nb)
1235 struct net_device *dev;
1236 struct net_device *last;
1241 err = raw_notifier_chain_register(&netdev_chain, nb);
1247 for_each_netdev(net, dev) {
1248 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1249 err = notifier_to_errno(err);
1253 if (!(dev->flags & IFF_UP))
1256 nb->notifier_call(nb, NETDEV_UP, dev);
1267 for_each_netdev(net, dev) {
1271 if (dev->flags & IFF_UP) {
1272 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1273 nb->notifier_call(nb, NETDEV_DOWN, dev);
1275 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1279 raw_notifier_chain_unregister(&netdev_chain, nb);
1284 * unregister_netdevice_notifier - unregister a network notifier block
1287 * Unregister a notifier previously registered by
1288 * register_netdevice_notifier(). The notifier is unlinked into the
1289 * kernel structures and may then be reused. A negative errno code
1290 * is returned on a failure.
1293 int unregister_netdevice_notifier(struct notifier_block *nb)
1298 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1304 * call_netdevice_notifiers - call all network notifier blocks
1305 * @val: value passed unmodified to notifier function
1306 * @dev: net_device pointer passed unmodified to notifier function
1308 * Call all network notifier blocks. Parameters and return value
1309 * are as for raw_notifier_call_chain().
1312 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1314 return raw_notifier_call_chain(&netdev_chain, val, dev);
1317 /* When > 0 there are consumers of rx skb time stamps */
1318 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1320 void net_enable_timestamp(void)
1322 atomic_inc(&netstamp_needed);
1325 void net_disable_timestamp(void)
1327 atomic_dec(&netstamp_needed);
1330 static inline void net_timestamp(struct sk_buff *skb)
1332 if (atomic_read(&netstamp_needed))
1333 __net_timestamp(skb);
1335 skb->tstamp.tv64 = 0;
1339 * Support routine. Sends outgoing frames to any network
1340 * taps currently in use.
1343 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1345 struct packet_type *ptype;
1350 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1351 /* Never send packets back to the socket
1352 * they originated from - MvS (miquels@drinkel.ow.org)
1354 if ((ptype->dev == dev || !ptype->dev) &&
1355 (ptype->af_packet_priv == NULL ||
1356 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1357 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1361 /* skb->nh should be correctly
1362 set by sender, so that the second statement is
1363 just protection against buggy protocols.
1365 skb_reset_mac_header(skb2);
1367 if (skb_network_header(skb2) < skb2->data ||
1368 skb2->network_header > skb2->tail) {
1369 if (net_ratelimit())
1370 printk(KERN_CRIT "protocol %04x is "
1372 skb2->protocol, dev->name);
1373 skb_reset_network_header(skb2);
1376 skb2->transport_header = skb2->network_header;
1377 skb2->pkt_type = PACKET_OUTGOING;
1378 ptype->func(skb2, skb->dev, ptype, skb->dev);
1385 static inline void __netif_reschedule(struct Qdisc *q)
1387 struct softnet_data *sd;
1388 unsigned long flags;
1390 local_irq_save(flags);
1391 sd = &__get_cpu_var(softnet_data);
1392 q->next_sched = sd->output_queue;
1393 sd->output_queue = q;
1394 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1395 local_irq_restore(flags);
1398 void __netif_schedule(struct Qdisc *q)
1400 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1401 __netif_reschedule(q);
1403 EXPORT_SYMBOL(__netif_schedule);
1405 void dev_kfree_skb_irq(struct sk_buff *skb)
1407 if (atomic_dec_and_test(&skb->users)) {
1408 struct softnet_data *sd;
1409 unsigned long flags;
1411 local_irq_save(flags);
1412 sd = &__get_cpu_var(softnet_data);
1413 skb->next = sd->completion_queue;
1414 sd->completion_queue = skb;
1415 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1416 local_irq_restore(flags);
1419 EXPORT_SYMBOL(dev_kfree_skb_irq);
1421 void dev_kfree_skb_any(struct sk_buff *skb)
1423 if (in_irq() || irqs_disabled())
1424 dev_kfree_skb_irq(skb);
1428 EXPORT_SYMBOL(dev_kfree_skb_any);
1432 * netif_device_detach - mark device as removed
1433 * @dev: network device
1435 * Mark device as removed from system and therefore no longer available.
1437 void netif_device_detach(struct net_device *dev)
1439 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1440 netif_running(dev)) {
1441 netif_stop_queue(dev);
1444 EXPORT_SYMBOL(netif_device_detach);
1447 * netif_device_attach - mark device as attached
1448 * @dev: network device
1450 * Mark device as attached from system and restart if needed.
1452 void netif_device_attach(struct net_device *dev)
1454 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1455 netif_running(dev)) {
1456 netif_wake_queue(dev);
1457 __netdev_watchdog_up(dev);
1460 EXPORT_SYMBOL(netif_device_attach);
1462 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1464 return ((features & NETIF_F_GEN_CSUM) ||
1465 ((features & NETIF_F_IP_CSUM) &&
1466 protocol == htons(ETH_P_IP)) ||
1467 ((features & NETIF_F_IPV6_CSUM) &&
1468 protocol == htons(ETH_P_IPV6)));
1471 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1473 if (can_checksum_protocol(dev->features, skb->protocol))
1476 if (skb->protocol == htons(ETH_P_8021Q)) {
1477 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1478 if (can_checksum_protocol(dev->features & dev->vlan_features,
1479 veh->h_vlan_encapsulated_proto))
1487 * Invalidate hardware checksum when packet is to be mangled, and
1488 * complete checksum manually on outgoing path.
1490 int skb_checksum_help(struct sk_buff *skb)
1493 int ret = 0, offset;
1495 if (skb->ip_summed == CHECKSUM_COMPLETE)
1496 goto out_set_summed;
1498 if (unlikely(skb_shinfo(skb)->gso_size)) {
1499 /* Let GSO fix up the checksum. */
1500 goto out_set_summed;
1503 offset = skb->csum_start - skb_headroom(skb);
1504 BUG_ON(offset >= skb_headlen(skb));
1505 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1507 offset += skb->csum_offset;
1508 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1510 if (skb_cloned(skb) &&
1511 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1512 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1517 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1519 skb->ip_summed = CHECKSUM_NONE;
1525 * skb_gso_segment - Perform segmentation on skb.
1526 * @skb: buffer to segment
1527 * @features: features for the output path (see dev->features)
1529 * This function segments the given skb and returns a list of segments.
1531 * It may return NULL if the skb requires no segmentation. This is
1532 * only possible when GSO is used for verifying header integrity.
1534 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1536 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1537 struct packet_type *ptype;
1538 __be16 type = skb->protocol;
1541 skb_reset_mac_header(skb);
1542 skb->mac_len = skb->network_header - skb->mac_header;
1543 __skb_pull(skb, skb->mac_len);
1545 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1546 struct net_device *dev = skb->dev;
1547 struct ethtool_drvinfo info = {};
1549 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1550 dev->ethtool_ops->get_drvinfo(dev, &info);
1552 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1554 info.driver, dev ? dev->features : 0L,
1555 skb->sk ? skb->sk->sk_route_caps : 0L,
1556 skb->len, skb->data_len, skb->ip_summed);
1558 if (skb_header_cloned(skb) &&
1559 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1560 return ERR_PTR(err);
1564 list_for_each_entry_rcu(ptype,
1565 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1566 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1567 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1568 err = ptype->gso_send_check(skb);
1569 segs = ERR_PTR(err);
1570 if (err || skb_gso_ok(skb, features))
1572 __skb_push(skb, (skb->data -
1573 skb_network_header(skb)));
1575 segs = ptype->gso_segment(skb, features);
1581 __skb_push(skb, skb->data - skb_mac_header(skb));
1586 EXPORT_SYMBOL(skb_gso_segment);
1588 /* Take action when hardware reception checksum errors are detected. */
1590 void netdev_rx_csum_fault(struct net_device *dev)
1592 if (net_ratelimit()) {
1593 printk(KERN_ERR "%s: hw csum failure.\n",
1594 dev ? dev->name : "<unknown>");
1598 EXPORT_SYMBOL(netdev_rx_csum_fault);
1601 /* Actually, we should eliminate this check as soon as we know, that:
1602 * 1. IOMMU is present and allows to map all the memory.
1603 * 2. No high memory really exists on this machine.
1606 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1608 #ifdef CONFIG_HIGHMEM
1611 if (dev->features & NETIF_F_HIGHDMA)
1614 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1615 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1623 void (*destructor)(struct sk_buff *skb);
1626 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1628 static void dev_gso_skb_destructor(struct sk_buff *skb)
1630 struct dev_gso_cb *cb;
1633 struct sk_buff *nskb = skb->next;
1635 skb->next = nskb->next;
1638 } while (skb->next);
1640 cb = DEV_GSO_CB(skb);
1642 cb->destructor(skb);
1646 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1647 * @skb: buffer to segment
1649 * This function segments the given skb and stores the list of segments
1652 static int dev_gso_segment(struct sk_buff *skb)
1654 struct net_device *dev = skb->dev;
1655 struct sk_buff *segs;
1656 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1659 segs = skb_gso_segment(skb, features);
1661 /* Verifying header integrity only. */
1666 return PTR_ERR(segs);
1669 DEV_GSO_CB(skb)->destructor = skb->destructor;
1670 skb->destructor = dev_gso_skb_destructor;
1675 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1676 struct netdev_queue *txq)
1678 const struct net_device_ops *ops = dev->netdev_ops;
1680 prefetch(&dev->netdev_ops->ndo_start_xmit);
1681 if (likely(!skb->next)) {
1682 if (!list_empty(&ptype_all))
1683 dev_queue_xmit_nit(skb, dev);
1685 if (netif_needs_gso(dev, skb)) {
1686 if (unlikely(dev_gso_segment(skb)))
1692 return ops->ndo_start_xmit(skb, dev);
1697 struct sk_buff *nskb = skb->next;
1700 skb->next = nskb->next;
1702 rc = ops->ndo_start_xmit(nskb, dev);
1704 nskb->next = skb->next;
1708 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1709 return NETDEV_TX_BUSY;
1710 } while (skb->next);
1712 skb->destructor = DEV_GSO_CB(skb)->destructor;
1719 static u32 skb_tx_hashrnd;
1720 static int skb_tx_hashrnd_initialized = 0;
1722 static u16 skb_tx_hash(struct net_device *dev, struct sk_buff *skb)
1726 if (unlikely(!skb_tx_hashrnd_initialized)) {
1727 get_random_bytes(&skb_tx_hashrnd, 4);
1728 skb_tx_hashrnd_initialized = 1;
1731 if (skb_rx_queue_recorded(skb)) {
1732 hash = skb_get_rx_queue(skb);
1733 } else if (skb->sk && skb->sk->sk_hash) {
1734 hash = skb->sk->sk_hash;
1736 hash = skb->protocol;
1738 hash = jhash_1word(hash, skb_tx_hashrnd);
1740 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1743 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
1744 struct sk_buff *skb)
1746 const struct net_device_ops *ops = dev->netdev_ops;
1747 u16 queue_index = 0;
1749 if (ops->ndo_select_queue)
1750 queue_index = ops->ndo_select_queue(dev, skb);
1751 else if (dev->real_num_tx_queues > 1)
1752 queue_index = skb_tx_hash(dev, skb);
1754 skb_set_queue_mapping(skb, queue_index);
1755 return netdev_get_tx_queue(dev, queue_index);
1759 * dev_queue_xmit - transmit a buffer
1760 * @skb: buffer to transmit
1762 * Queue a buffer for transmission to a network device. The caller must
1763 * have set the device and priority and built the buffer before calling
1764 * this function. The function can be called from an interrupt.
1766 * A negative errno code is returned on a failure. A success does not
1767 * guarantee the frame will be transmitted as it may be dropped due
1768 * to congestion or traffic shaping.
1770 * -----------------------------------------------------------------------------------
1771 * I notice this method can also return errors from the queue disciplines,
1772 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1775 * Regardless of the return value, the skb is consumed, so it is currently
1776 * difficult to retry a send to this method. (You can bump the ref count
1777 * before sending to hold a reference for retry if you are careful.)
1779 * When calling this method, interrupts MUST be enabled. This is because
1780 * the BH enable code must have IRQs enabled so that it will not deadlock.
1783 int dev_queue_xmit(struct sk_buff *skb)
1785 struct net_device *dev = skb->dev;
1786 struct netdev_queue *txq;
1790 /* GSO will handle the following emulations directly. */
1791 if (netif_needs_gso(dev, skb))
1794 if (skb_shinfo(skb)->frag_list &&
1795 !(dev->features & NETIF_F_FRAGLIST) &&
1796 __skb_linearize(skb))
1799 /* Fragmented skb is linearized if device does not support SG,
1800 * or if at least one of fragments is in highmem and device
1801 * does not support DMA from it.
1803 if (skb_shinfo(skb)->nr_frags &&
1804 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1805 __skb_linearize(skb))
1808 /* If packet is not checksummed and device does not support
1809 * checksumming for this protocol, complete checksumming here.
1811 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1812 skb_set_transport_header(skb, skb->csum_start -
1814 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
1819 /* Disable soft irqs for various locks below. Also
1820 * stops preemption for RCU.
1824 txq = dev_pick_tx(dev, skb);
1825 q = rcu_dereference(txq->qdisc);
1827 #ifdef CONFIG_NET_CLS_ACT
1828 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1831 spinlock_t *root_lock = qdisc_lock(q);
1833 spin_lock(root_lock);
1835 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
1839 rc = qdisc_enqueue_root(skb, q);
1842 spin_unlock(root_lock);
1847 /* The device has no queue. Common case for software devices:
1848 loopback, all the sorts of tunnels...
1850 Really, it is unlikely that netif_tx_lock protection is necessary
1851 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1853 However, it is possible, that they rely on protection
1856 Check this and shot the lock. It is not prone from deadlocks.
1857 Either shot noqueue qdisc, it is even simpler 8)
1859 if (dev->flags & IFF_UP) {
1860 int cpu = smp_processor_id(); /* ok because BHs are off */
1862 if (txq->xmit_lock_owner != cpu) {
1864 HARD_TX_LOCK(dev, txq, cpu);
1866 if (!netif_tx_queue_stopped(txq)) {
1868 if (!dev_hard_start_xmit(skb, dev, txq)) {
1869 HARD_TX_UNLOCK(dev, txq);
1873 HARD_TX_UNLOCK(dev, txq);
1874 if (net_ratelimit())
1875 printk(KERN_CRIT "Virtual device %s asks to "
1876 "queue packet!\n", dev->name);
1878 /* Recursion is detected! It is possible,
1880 if (net_ratelimit())
1881 printk(KERN_CRIT "Dead loop on virtual device "
1882 "%s, fix it urgently!\n", dev->name);
1887 rcu_read_unlock_bh();
1893 rcu_read_unlock_bh();
1898 /*=======================================================================
1900 =======================================================================*/
1902 int netdev_max_backlog __read_mostly = 1000;
1903 int netdev_budget __read_mostly = 300;
1904 int weight_p __read_mostly = 64; /* old backlog weight */
1906 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1910 * netif_rx - post buffer to the network code
1911 * @skb: buffer to post
1913 * This function receives a packet from a device driver and queues it for
1914 * the upper (protocol) levels to process. It always succeeds. The buffer
1915 * may be dropped during processing for congestion control or by the
1919 * NET_RX_SUCCESS (no congestion)
1920 * NET_RX_DROP (packet was dropped)
1924 int netif_rx(struct sk_buff *skb)
1926 struct softnet_data *queue;
1927 unsigned long flags;
1929 /* if netpoll wants it, pretend we never saw it */
1930 if (netpoll_rx(skb))
1933 if (!skb->tstamp.tv64)
1937 * The code is rearranged so that the path is the most
1938 * short when CPU is congested, but is still operating.
1940 local_irq_save(flags);
1941 queue = &__get_cpu_var(softnet_data);
1943 __get_cpu_var(netdev_rx_stat).total++;
1944 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1945 if (queue->input_pkt_queue.qlen) {
1947 __skb_queue_tail(&queue->input_pkt_queue, skb);
1948 local_irq_restore(flags);
1949 return NET_RX_SUCCESS;
1952 napi_schedule(&queue->backlog);
1956 __get_cpu_var(netdev_rx_stat).dropped++;
1957 local_irq_restore(flags);
1963 int netif_rx_ni(struct sk_buff *skb)
1968 err = netif_rx(skb);
1969 if (local_softirq_pending())
1976 EXPORT_SYMBOL(netif_rx_ni);
1978 static void net_tx_action(struct softirq_action *h)
1980 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1982 if (sd->completion_queue) {
1983 struct sk_buff *clist;
1985 local_irq_disable();
1986 clist = sd->completion_queue;
1987 sd->completion_queue = NULL;
1991 struct sk_buff *skb = clist;
1992 clist = clist->next;
1994 WARN_ON(atomic_read(&skb->users));
1999 if (sd->output_queue) {
2002 local_irq_disable();
2003 head = sd->output_queue;
2004 sd->output_queue = NULL;
2008 struct Qdisc *q = head;
2009 spinlock_t *root_lock;
2011 head = head->next_sched;
2013 root_lock = qdisc_lock(q);
2014 if (spin_trylock(root_lock)) {
2015 smp_mb__before_clear_bit();
2016 clear_bit(__QDISC_STATE_SCHED,
2019 spin_unlock(root_lock);
2021 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2023 __netif_reschedule(q);
2025 smp_mb__before_clear_bit();
2026 clear_bit(__QDISC_STATE_SCHED,
2034 static inline int deliver_skb(struct sk_buff *skb,
2035 struct packet_type *pt_prev,
2036 struct net_device *orig_dev)
2038 atomic_inc(&skb->users);
2039 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2042 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2043 /* These hooks defined here for ATM */
2045 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
2046 unsigned char *addr);
2047 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
2050 * If bridge module is loaded call bridging hook.
2051 * returns NULL if packet was consumed.
2053 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2054 struct sk_buff *skb) __read_mostly;
2055 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2056 struct packet_type **pt_prev, int *ret,
2057 struct net_device *orig_dev)
2059 struct net_bridge_port *port;
2061 if (skb->pkt_type == PACKET_LOOPBACK ||
2062 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2066 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2070 return br_handle_frame_hook(port, skb);
2073 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2076 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2077 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2078 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2080 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2081 struct packet_type **pt_prev,
2083 struct net_device *orig_dev)
2085 if (skb->dev->macvlan_port == NULL)
2089 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2092 return macvlan_handle_frame_hook(skb);
2095 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2098 #ifdef CONFIG_NET_CLS_ACT
2099 /* TODO: Maybe we should just force sch_ingress to be compiled in
2100 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2101 * a compare and 2 stores extra right now if we dont have it on
2102 * but have CONFIG_NET_CLS_ACT
2103 * NOTE: This doesnt stop any functionality; if you dont have
2104 * the ingress scheduler, you just cant add policies on ingress.
2107 static int ing_filter(struct sk_buff *skb)
2109 struct net_device *dev = skb->dev;
2110 u32 ttl = G_TC_RTTL(skb->tc_verd);
2111 struct netdev_queue *rxq;
2112 int result = TC_ACT_OK;
2115 if (MAX_RED_LOOP < ttl++) {
2117 "Redir loop detected Dropping packet (%d->%d)\n",
2118 skb->iif, dev->ifindex);
2122 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2123 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2125 rxq = &dev->rx_queue;
2128 if (q != &noop_qdisc) {
2129 spin_lock(qdisc_lock(q));
2130 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2131 result = qdisc_enqueue_root(skb, q);
2132 spin_unlock(qdisc_lock(q));
2138 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2139 struct packet_type **pt_prev,
2140 int *ret, struct net_device *orig_dev)
2142 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2146 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2149 /* Huh? Why does turning on AF_PACKET affect this? */
2150 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2153 switch (ing_filter(skb)) {
2167 * netif_nit_deliver - deliver received packets to network taps
2170 * This function is used to deliver incoming packets to network
2171 * taps. It should be used when the normal netif_receive_skb path
2172 * is bypassed, for example because of VLAN acceleration.
2174 void netif_nit_deliver(struct sk_buff *skb)
2176 struct packet_type *ptype;
2178 if (list_empty(&ptype_all))
2181 skb_reset_network_header(skb);
2182 skb_reset_transport_header(skb);
2183 skb->mac_len = skb->network_header - skb->mac_header;
2186 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2187 if (!ptype->dev || ptype->dev == skb->dev)
2188 deliver_skb(skb, ptype, skb->dev);
2194 * netif_receive_skb - process receive buffer from network
2195 * @skb: buffer to process
2197 * netif_receive_skb() is the main receive data processing function.
2198 * It always succeeds. The buffer may be dropped during processing
2199 * for congestion control or by the protocol layers.
2201 * This function may only be called from softirq context and interrupts
2202 * should be enabled.
2204 * Return values (usually ignored):
2205 * NET_RX_SUCCESS: no congestion
2206 * NET_RX_DROP: packet was dropped
2208 int netif_receive_skb(struct sk_buff *skb)
2210 struct packet_type *ptype, *pt_prev;
2211 struct net_device *orig_dev;
2212 struct net_device *null_or_orig;
2213 int ret = NET_RX_DROP;
2216 if (skb->vlan_tci && vlan_hwaccel_do_receive(skb))
2217 return NET_RX_SUCCESS;
2219 /* if we've gotten here through NAPI, check netpoll */
2220 if (netpoll_receive_skb(skb))
2223 if (!skb->tstamp.tv64)
2227 skb->iif = skb->dev->ifindex;
2229 null_or_orig = NULL;
2230 orig_dev = skb->dev;
2231 if (orig_dev->master) {
2232 if (skb_bond_should_drop(skb))
2233 null_or_orig = orig_dev; /* deliver only exact match */
2235 skb->dev = orig_dev->master;
2238 __get_cpu_var(netdev_rx_stat).total++;
2240 skb_reset_network_header(skb);
2241 skb_reset_transport_header(skb);
2242 skb->mac_len = skb->network_header - skb->mac_header;
2248 /* Don't receive packets in an exiting network namespace */
2249 if (!net_alive(dev_net(skb->dev))) {
2254 #ifdef CONFIG_NET_CLS_ACT
2255 if (skb->tc_verd & TC_NCLS) {
2256 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2261 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2262 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2263 ptype->dev == orig_dev) {
2265 ret = deliver_skb(skb, pt_prev, orig_dev);
2270 #ifdef CONFIG_NET_CLS_ACT
2271 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2277 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2280 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2286 type = skb->protocol;
2287 list_for_each_entry_rcu(ptype,
2288 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2289 if (ptype->type == type &&
2290 (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2291 ptype->dev == orig_dev)) {
2293 ret = deliver_skb(skb, pt_prev, orig_dev);
2299 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2302 /* Jamal, now you will not able to escape explaining
2303 * me how you were going to use this. :-)
2313 /* Network device is going away, flush any packets still pending */
2314 static void flush_backlog(void *arg)
2316 struct net_device *dev = arg;
2317 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2318 struct sk_buff *skb, *tmp;
2320 skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp)
2321 if (skb->dev == dev) {
2322 __skb_unlink(skb, &queue->input_pkt_queue);
2327 static int napi_gro_complete(struct sk_buff *skb)
2329 struct packet_type *ptype;
2330 __be16 type = skb->protocol;
2331 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2334 if (NAPI_GRO_CB(skb)->count == 1)
2338 list_for_each_entry_rcu(ptype, head, list) {
2339 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2342 err = ptype->gro_complete(skb);
2348 WARN_ON(&ptype->list == head);
2350 return NET_RX_SUCCESS;
2354 skb_shinfo(skb)->gso_size = 0;
2355 return netif_receive_skb(skb);
2358 void napi_gro_flush(struct napi_struct *napi)
2360 struct sk_buff *skb, *next;
2362 for (skb = napi->gro_list; skb; skb = next) {
2365 napi_gro_complete(skb);
2368 napi->gro_count = 0;
2369 napi->gro_list = NULL;
2371 EXPORT_SYMBOL(napi_gro_flush);
2373 void *skb_gro_header(struct sk_buff *skb, unsigned int hlen)
2375 unsigned int offset = skb_gro_offset(skb);
2378 if (hlen <= skb_headlen(skb))
2379 return skb->data + offset;
2381 if (unlikely(!skb_shinfo(skb)->nr_frags ||
2382 skb_shinfo(skb)->frags[0].size <=
2383 hlen - skb_headlen(skb) ||
2384 PageHighMem(skb_shinfo(skb)->frags[0].page)))
2385 return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
2387 return page_address(skb_shinfo(skb)->frags[0].page) +
2388 skb_shinfo(skb)->frags[0].page_offset +
2389 offset - skb_headlen(skb);
2391 EXPORT_SYMBOL(skb_gro_header);
2393 int dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2395 struct sk_buff **pp = NULL;
2396 struct packet_type *ptype;
2397 __be16 type = skb->protocol;
2398 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2403 if (!(skb->dev->features & NETIF_F_GRO))
2406 if (skb_is_gso(skb) || skb_shinfo(skb)->frag_list)
2410 list_for_each_entry_rcu(ptype, head, list) {
2411 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
2414 skb_set_network_header(skb, skb_gro_offset(skb));
2415 mac_len = skb->network_header - skb->mac_header;
2416 skb->mac_len = mac_len;
2417 NAPI_GRO_CB(skb)->same_flow = 0;
2418 NAPI_GRO_CB(skb)->flush = 0;
2419 NAPI_GRO_CB(skb)->free = 0;
2421 pp = ptype->gro_receive(&napi->gro_list, skb);
2426 if (&ptype->list == head)
2429 same_flow = NAPI_GRO_CB(skb)->same_flow;
2430 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
2433 struct sk_buff *nskb = *pp;
2437 napi_gro_complete(nskb);
2444 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
2448 NAPI_GRO_CB(skb)->count = 1;
2449 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
2450 skb->next = napi->gro_list;
2451 napi->gro_list = skb;
2455 if (unlikely(!pskb_may_pull(skb, skb_gro_offset(skb)))) {
2456 if (napi->gro_list == skb)
2457 napi->gro_list = skb->next;
2468 EXPORT_SYMBOL(dev_gro_receive);
2470 static int __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2474 for (p = napi->gro_list; p; p = p->next) {
2475 NAPI_GRO_CB(p)->same_flow = !compare_ether_header(
2476 skb_mac_header(p), skb_gro_mac_header(skb));
2477 NAPI_GRO_CB(p)->flush = 0;
2480 return dev_gro_receive(napi, skb);
2483 int napi_skb_finish(int ret, struct sk_buff *skb)
2485 int err = NET_RX_SUCCESS;
2489 return netif_receive_skb(skb);
2495 case GRO_MERGED_FREE:
2502 EXPORT_SYMBOL(napi_skb_finish);
2504 int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2506 skb_gro_reset_offset(skb);
2508 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
2510 EXPORT_SYMBOL(napi_gro_receive);
2512 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
2514 __skb_pull(skb, skb_headlen(skb));
2515 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
2519 EXPORT_SYMBOL(napi_reuse_skb);
2521 struct sk_buff *napi_fraginfo_skb(struct napi_struct *napi,
2522 struct napi_gro_fraginfo *info)
2524 struct net_device *dev = napi->dev;
2525 struct sk_buff *skb = napi->skb;
2533 skb = netdev_alloc_skb(dev, GRO_MAX_HEAD + NET_IP_ALIGN);
2537 skb_reserve(skb, NET_IP_ALIGN);
2540 BUG_ON(info->nr_frags > MAX_SKB_FRAGS);
2541 frag = &info->frags[info->nr_frags - 1];
2543 for (i = skb_shinfo(skb)->nr_frags; i < info->nr_frags; i++) {
2544 skb_fill_page_desc(skb, i, frag->page, frag->page_offset,
2548 skb_shinfo(skb)->nr_frags = info->nr_frags;
2550 skb->data_len = info->len;
2551 skb->len += info->len;
2552 skb->truesize += info->len;
2554 skb_reset_mac_header(skb);
2555 skb_gro_reset_offset(skb);
2557 eth = skb_gro_header(skb, sizeof(*eth));
2559 napi_reuse_skb(napi, skb);
2564 skb_gro_pull(skb, sizeof(*eth));
2567 * This works because the only protocols we care about don't require
2568 * special handling. We'll fix it up properly at the end.
2570 skb->protocol = eth->h_proto;
2572 skb->ip_summed = info->ip_summed;
2573 skb->csum = info->csum;
2578 EXPORT_SYMBOL(napi_fraginfo_skb);
2580 int napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, int ret)
2582 int err = NET_RX_SUCCESS;
2587 skb->protocol = eth_type_trans(skb, napi->dev);
2589 if (ret == GRO_NORMAL)
2590 return netif_receive_skb(skb);
2592 skb_gro_pull(skb, -ETH_HLEN);
2599 case GRO_MERGED_FREE:
2600 napi_reuse_skb(napi, skb);
2606 EXPORT_SYMBOL(napi_frags_finish);
2608 int napi_gro_frags(struct napi_struct *napi, struct napi_gro_fraginfo *info)
2610 struct sk_buff *skb = napi_fraginfo_skb(napi, info);
2615 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
2617 EXPORT_SYMBOL(napi_gro_frags);
2619 static int process_backlog(struct napi_struct *napi, int quota)
2622 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2623 unsigned long start_time = jiffies;
2625 napi->weight = weight_p;
2627 struct sk_buff *skb;
2629 local_irq_disable();
2630 skb = __skb_dequeue(&queue->input_pkt_queue);
2632 __napi_complete(napi);
2638 napi_gro_receive(napi, skb);
2639 } while (++work < quota && jiffies == start_time);
2641 napi_gro_flush(napi);
2647 * __napi_schedule - schedule for receive
2648 * @n: entry to schedule
2650 * The entry's receive function will be scheduled to run
2652 void __napi_schedule(struct napi_struct *n)
2654 unsigned long flags;
2656 local_irq_save(flags);
2657 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2658 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2659 local_irq_restore(flags);
2661 EXPORT_SYMBOL(__napi_schedule);
2663 void __napi_complete(struct napi_struct *n)
2665 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
2666 BUG_ON(n->gro_list);
2668 list_del(&n->poll_list);
2669 smp_mb__before_clear_bit();
2670 clear_bit(NAPI_STATE_SCHED, &n->state);
2672 EXPORT_SYMBOL(__napi_complete);
2674 void napi_complete(struct napi_struct *n)
2676 unsigned long flags;
2679 * don't let napi dequeue from the cpu poll list
2680 * just in case its running on a different cpu
2682 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
2686 local_irq_save(flags);
2688 local_irq_restore(flags);
2690 EXPORT_SYMBOL(napi_complete);
2692 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
2693 int (*poll)(struct napi_struct *, int), int weight)
2695 INIT_LIST_HEAD(&napi->poll_list);
2696 napi->gro_count = 0;
2697 napi->gro_list = NULL;
2700 napi->weight = weight;
2701 list_add(&napi->dev_list, &dev->napi_list);
2703 #ifdef CONFIG_NETPOLL
2704 spin_lock_init(&napi->poll_lock);
2705 napi->poll_owner = -1;
2707 set_bit(NAPI_STATE_SCHED, &napi->state);
2709 EXPORT_SYMBOL(netif_napi_add);
2711 void netif_napi_del(struct napi_struct *napi)
2713 struct sk_buff *skb, *next;
2715 list_del_init(&napi->dev_list);
2718 for (skb = napi->gro_list; skb; skb = next) {
2724 napi->gro_list = NULL;
2725 napi->gro_count = 0;
2727 EXPORT_SYMBOL(netif_napi_del);
2730 static void net_rx_action(struct softirq_action *h)
2732 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2733 unsigned long time_limit = jiffies + 2;
2734 int budget = netdev_budget;
2737 local_irq_disable();
2739 while (!list_empty(list)) {
2740 struct napi_struct *n;
2743 /* If softirq window is exhuasted then punt.
2744 * Allow this to run for 2 jiffies since which will allow
2745 * an average latency of 1.5/HZ.
2747 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
2752 /* Even though interrupts have been re-enabled, this
2753 * access is safe because interrupts can only add new
2754 * entries to the tail of this list, and only ->poll()
2755 * calls can remove this head entry from the list.
2757 n = list_entry(list->next, struct napi_struct, poll_list);
2759 have = netpoll_poll_lock(n);
2763 /* This NAPI_STATE_SCHED test is for avoiding a race
2764 * with netpoll's poll_napi(). Only the entity which
2765 * obtains the lock and sees NAPI_STATE_SCHED set will
2766 * actually make the ->poll() call. Therefore we avoid
2767 * accidently calling ->poll() when NAPI is not scheduled.
2770 if (test_bit(NAPI_STATE_SCHED, &n->state))
2771 work = n->poll(n, weight);
2773 WARN_ON_ONCE(work > weight);
2777 local_irq_disable();
2779 /* Drivers must not modify the NAPI state if they
2780 * consume the entire weight. In such cases this code
2781 * still "owns" the NAPI instance and therefore can
2782 * move the instance around on the list at-will.
2784 if (unlikely(work == weight)) {
2785 if (unlikely(napi_disable_pending(n)))
2788 list_move_tail(&n->poll_list, list);
2791 netpoll_poll_unlock(have);
2796 #ifdef CONFIG_NET_DMA
2798 * There may not be any more sk_buffs coming right now, so push
2799 * any pending DMA copies to hardware
2801 dma_issue_pending_all();
2807 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2808 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2812 static gifconf_func_t * gifconf_list [NPROTO];
2815 * register_gifconf - register a SIOCGIF handler
2816 * @family: Address family
2817 * @gifconf: Function handler
2819 * Register protocol dependent address dumping routines. The handler
2820 * that is passed must not be freed or reused until it has been replaced
2821 * by another handler.
2823 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2825 if (family >= NPROTO)
2827 gifconf_list[family] = gifconf;
2833 * Map an interface index to its name (SIOCGIFNAME)
2837 * We need this ioctl for efficient implementation of the
2838 * if_indextoname() function required by the IPv6 API. Without
2839 * it, we would have to search all the interfaces to find a
2843 static int dev_ifname(struct net *net, struct ifreq __user *arg)
2845 struct net_device *dev;
2849 * Fetch the caller's info block.
2852 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2855 read_lock(&dev_base_lock);
2856 dev = __dev_get_by_index(net, ifr.ifr_ifindex);
2858 read_unlock(&dev_base_lock);
2862 strcpy(ifr.ifr_name, dev->name);
2863 read_unlock(&dev_base_lock);
2865 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2871 * Perform a SIOCGIFCONF call. This structure will change
2872 * size eventually, and there is nothing I can do about it.
2873 * Thus we will need a 'compatibility mode'.
2876 static int dev_ifconf(struct net *net, char __user *arg)
2879 struct net_device *dev;
2886 * Fetch the caller's info block.
2889 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2896 * Loop over the interfaces, and write an info block for each.
2900 for_each_netdev(net, dev) {
2901 for (i = 0; i < NPROTO; i++) {
2902 if (gifconf_list[i]) {
2905 done = gifconf_list[i](dev, NULL, 0);
2907 done = gifconf_list[i](dev, pos + total,
2917 * All done. Write the updated control block back to the caller.
2919 ifc.ifc_len = total;
2922 * Both BSD and Solaris return 0 here, so we do too.
2924 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2927 #ifdef CONFIG_PROC_FS
2929 * This is invoked by the /proc filesystem handler to display a device
2932 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2933 __acquires(dev_base_lock)
2935 struct net *net = seq_file_net(seq);
2937 struct net_device *dev;
2939 read_lock(&dev_base_lock);
2941 return SEQ_START_TOKEN;
2944 for_each_netdev(net, dev)
2951 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2953 struct net *net = seq_file_net(seq);
2955 return v == SEQ_START_TOKEN ?
2956 first_net_device(net) : next_net_device((struct net_device *)v);
2959 void dev_seq_stop(struct seq_file *seq, void *v)
2960 __releases(dev_base_lock)
2962 read_unlock(&dev_base_lock);
2965 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2967 const struct net_device_stats *stats = dev_get_stats(dev);
2969 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2970 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2971 dev->name, stats->rx_bytes, stats->rx_packets,
2973 stats->rx_dropped + stats->rx_missed_errors,
2974 stats->rx_fifo_errors,
2975 stats->rx_length_errors + stats->rx_over_errors +
2976 stats->rx_crc_errors + stats->rx_frame_errors,
2977 stats->rx_compressed, stats->multicast,
2978 stats->tx_bytes, stats->tx_packets,
2979 stats->tx_errors, stats->tx_dropped,
2980 stats->tx_fifo_errors, stats->collisions,
2981 stats->tx_carrier_errors +
2982 stats->tx_aborted_errors +
2983 stats->tx_window_errors +
2984 stats->tx_heartbeat_errors,
2985 stats->tx_compressed);
2989 * Called from the PROCfs module. This now uses the new arbitrary sized
2990 * /proc/net interface to create /proc/net/dev
2992 static int dev_seq_show(struct seq_file *seq, void *v)
2994 if (v == SEQ_START_TOKEN)
2995 seq_puts(seq, "Inter-| Receive "
2997 " face |bytes packets errs drop fifo frame "
2998 "compressed multicast|bytes packets errs "
2999 "drop fifo colls carrier compressed\n");
3001 dev_seq_printf_stats(seq, v);
3005 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
3007 struct netif_rx_stats *rc = NULL;
3009 while (*pos < nr_cpu_ids)
3010 if (cpu_online(*pos)) {
3011 rc = &per_cpu(netdev_rx_stat, *pos);
3018 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3020 return softnet_get_online(pos);
3023 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3026 return softnet_get_online(pos);
3029 static void softnet_seq_stop(struct seq_file *seq, void *v)
3033 static int softnet_seq_show(struct seq_file *seq, void *v)
3035 struct netif_rx_stats *s = v;
3037 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3038 s->total, s->dropped, s->time_squeeze, 0,
3039 0, 0, 0, 0, /* was fastroute */
3044 static const struct seq_operations dev_seq_ops = {
3045 .start = dev_seq_start,
3046 .next = dev_seq_next,
3047 .stop = dev_seq_stop,
3048 .show = dev_seq_show,
3051 static int dev_seq_open(struct inode *inode, struct file *file)
3053 return seq_open_net(inode, file, &dev_seq_ops,
3054 sizeof(struct seq_net_private));
3057 static const struct file_operations dev_seq_fops = {
3058 .owner = THIS_MODULE,
3059 .open = dev_seq_open,
3061 .llseek = seq_lseek,
3062 .release = seq_release_net,
3065 static const struct seq_operations softnet_seq_ops = {
3066 .start = softnet_seq_start,
3067 .next = softnet_seq_next,
3068 .stop = softnet_seq_stop,
3069 .show = softnet_seq_show,
3072 static int softnet_seq_open(struct inode *inode, struct file *file)
3074 return seq_open(file, &softnet_seq_ops);
3077 static const struct file_operations softnet_seq_fops = {
3078 .owner = THIS_MODULE,
3079 .open = softnet_seq_open,
3081 .llseek = seq_lseek,
3082 .release = seq_release,
3085 static void *ptype_get_idx(loff_t pos)
3087 struct packet_type *pt = NULL;
3091 list_for_each_entry_rcu(pt, &ptype_all, list) {
3097 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3098 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3107 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3111 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3114 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3116 struct packet_type *pt;
3117 struct list_head *nxt;
3121 if (v == SEQ_START_TOKEN)
3122 return ptype_get_idx(0);
3125 nxt = pt->list.next;
3126 if (pt->type == htons(ETH_P_ALL)) {
3127 if (nxt != &ptype_all)
3130 nxt = ptype_base[0].next;
3132 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3134 while (nxt == &ptype_base[hash]) {
3135 if (++hash >= PTYPE_HASH_SIZE)
3137 nxt = ptype_base[hash].next;
3140 return list_entry(nxt, struct packet_type, list);
3143 static void ptype_seq_stop(struct seq_file *seq, void *v)
3149 static int ptype_seq_show(struct seq_file *seq, void *v)
3151 struct packet_type *pt = v;
3153 if (v == SEQ_START_TOKEN)
3154 seq_puts(seq, "Type Device Function\n");
3155 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3156 if (pt->type == htons(ETH_P_ALL))
3157 seq_puts(seq, "ALL ");
3159 seq_printf(seq, "%04x", ntohs(pt->type));
3161 seq_printf(seq, " %-8s %pF\n",
3162 pt->dev ? pt->dev->name : "", pt->func);
3168 static const struct seq_operations ptype_seq_ops = {
3169 .start = ptype_seq_start,
3170 .next = ptype_seq_next,
3171 .stop = ptype_seq_stop,
3172 .show = ptype_seq_show,
3175 static int ptype_seq_open(struct inode *inode, struct file *file)
3177 return seq_open_net(inode, file, &ptype_seq_ops,
3178 sizeof(struct seq_net_private));
3181 static const struct file_operations ptype_seq_fops = {
3182 .owner = THIS_MODULE,
3183 .open = ptype_seq_open,
3185 .llseek = seq_lseek,
3186 .release = seq_release_net,
3190 static int __net_init dev_proc_net_init(struct net *net)
3194 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3196 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3198 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3201 if (wext_proc_init(net))
3207 proc_net_remove(net, "ptype");
3209 proc_net_remove(net, "softnet_stat");
3211 proc_net_remove(net, "dev");
3215 static void __net_exit dev_proc_net_exit(struct net *net)
3217 wext_proc_exit(net);
3219 proc_net_remove(net, "ptype");
3220 proc_net_remove(net, "softnet_stat");
3221 proc_net_remove(net, "dev");
3224 static struct pernet_operations __net_initdata dev_proc_ops = {
3225 .init = dev_proc_net_init,
3226 .exit = dev_proc_net_exit,
3229 static int __init dev_proc_init(void)
3231 return register_pernet_subsys(&dev_proc_ops);
3234 #define dev_proc_init() 0
3235 #endif /* CONFIG_PROC_FS */
3239 * netdev_set_master - set up master/slave pair
3240 * @slave: slave device
3241 * @master: new master device
3243 * Changes the master device of the slave. Pass %NULL to break the
3244 * bonding. The caller must hold the RTNL semaphore. On a failure
3245 * a negative errno code is returned. On success the reference counts
3246 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3247 * function returns zero.
3249 int netdev_set_master(struct net_device *slave, struct net_device *master)
3251 struct net_device *old = slave->master;
3261 slave->master = master;
3269 slave->flags |= IFF_SLAVE;
3271 slave->flags &= ~IFF_SLAVE;
3273 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3277 static void dev_change_rx_flags(struct net_device *dev, int flags)
3279 const struct net_device_ops *ops = dev->netdev_ops;
3281 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3282 ops->ndo_change_rx_flags(dev, flags);
3285 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3287 unsigned short old_flags = dev->flags;
3293 dev->flags |= IFF_PROMISC;
3294 dev->promiscuity += inc;
3295 if (dev->promiscuity == 0) {
3298 * If inc causes overflow, untouch promisc and return error.
3301 dev->flags &= ~IFF_PROMISC;
3303 dev->promiscuity -= inc;
3304 printk(KERN_WARNING "%s: promiscuity touches roof, "
3305 "set promiscuity failed, promiscuity feature "
3306 "of device might be broken.\n", dev->name);
3310 if (dev->flags != old_flags) {
3311 printk(KERN_INFO "device %s %s promiscuous mode\n",
3312 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3314 if (audit_enabled) {
3315 current_uid_gid(&uid, &gid);
3316 audit_log(current->audit_context, GFP_ATOMIC,
3317 AUDIT_ANOM_PROMISCUOUS,
3318 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3319 dev->name, (dev->flags & IFF_PROMISC),
3320 (old_flags & IFF_PROMISC),
3321 audit_get_loginuid(current),
3323 audit_get_sessionid(current));
3326 dev_change_rx_flags(dev, IFF_PROMISC);
3332 * dev_set_promiscuity - update promiscuity count on a device
3336 * Add or remove promiscuity from a device. While the count in the device
3337 * remains above zero the interface remains promiscuous. Once it hits zero
3338 * the device reverts back to normal filtering operation. A negative inc
3339 * value is used to drop promiscuity on the device.
3340 * Return 0 if successful or a negative errno code on error.
3342 int dev_set_promiscuity(struct net_device *dev, int inc)
3344 unsigned short old_flags = dev->flags;
3347 err = __dev_set_promiscuity(dev, inc);
3350 if (dev->flags != old_flags)
3351 dev_set_rx_mode(dev);
3356 * dev_set_allmulti - update allmulti count on a device
3360 * Add or remove reception of all multicast frames to a device. While the
3361 * count in the device remains above zero the interface remains listening
3362 * to all interfaces. Once it hits zero the device reverts back to normal
3363 * filtering operation. A negative @inc value is used to drop the counter
3364 * when releasing a resource needing all multicasts.
3365 * Return 0 if successful or a negative errno code on error.
3368 int dev_set_allmulti(struct net_device *dev, int inc)
3370 unsigned short old_flags = dev->flags;
3374 dev->flags |= IFF_ALLMULTI;
3375 dev->allmulti += inc;
3376 if (dev->allmulti == 0) {
3379 * If inc causes overflow, untouch allmulti and return error.
3382 dev->flags &= ~IFF_ALLMULTI;
3384 dev->allmulti -= inc;
3385 printk(KERN_WARNING "%s: allmulti touches roof, "
3386 "set allmulti failed, allmulti feature of "
3387 "device might be broken.\n", dev->name);
3391 if (dev->flags ^ old_flags) {
3392 dev_change_rx_flags(dev, IFF_ALLMULTI);
3393 dev_set_rx_mode(dev);
3399 * Upload unicast and multicast address lists to device and
3400 * configure RX filtering. When the device doesn't support unicast
3401 * filtering it is put in promiscuous mode while unicast addresses
3404 void __dev_set_rx_mode(struct net_device *dev)
3406 const struct net_device_ops *ops = dev->netdev_ops;
3408 /* dev_open will call this function so the list will stay sane. */
3409 if (!(dev->flags&IFF_UP))
3412 if (!netif_device_present(dev))
3415 if (ops->ndo_set_rx_mode)
3416 ops->ndo_set_rx_mode(dev);
3418 /* Unicast addresses changes may only happen under the rtnl,
3419 * therefore calling __dev_set_promiscuity here is safe.
3421 if (dev->uc_count > 0 && !dev->uc_promisc) {
3422 __dev_set_promiscuity(dev, 1);
3423 dev->uc_promisc = 1;
3424 } else if (dev->uc_count == 0 && dev->uc_promisc) {
3425 __dev_set_promiscuity(dev, -1);
3426 dev->uc_promisc = 0;
3429 if (ops->ndo_set_multicast_list)
3430 ops->ndo_set_multicast_list(dev);
3434 void dev_set_rx_mode(struct net_device *dev)
3436 netif_addr_lock_bh(dev);
3437 __dev_set_rx_mode(dev);
3438 netif_addr_unlock_bh(dev);
3441 int __dev_addr_delete(struct dev_addr_list **list, int *count,
3442 void *addr, int alen, int glbl)
3444 struct dev_addr_list *da;
3446 for (; (da = *list) != NULL; list = &da->next) {
3447 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3448 alen == da->da_addrlen) {
3450 int old_glbl = da->da_gusers;
3467 int __dev_addr_add(struct dev_addr_list **list, int *count,
3468 void *addr, int alen, int glbl)
3470 struct dev_addr_list *da;
3472 for (da = *list; da != NULL; da = da->next) {
3473 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3474 da->da_addrlen == alen) {
3476 int old_glbl = da->da_gusers;
3486 da = kzalloc(sizeof(*da), GFP_ATOMIC);
3489 memcpy(da->da_addr, addr, alen);
3490 da->da_addrlen = alen;
3492 da->da_gusers = glbl ? 1 : 0;
3500 * dev_unicast_delete - Release secondary unicast address.
3502 * @addr: address to delete
3503 * @alen: length of @addr
3505 * Release reference to a secondary unicast address and remove it
3506 * from the device if the reference count drops to zero.
3508 * The caller must hold the rtnl_mutex.
3510 int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
3516 netif_addr_lock_bh(dev);
3517 err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3519 __dev_set_rx_mode(dev);
3520 netif_addr_unlock_bh(dev);
3523 EXPORT_SYMBOL(dev_unicast_delete);
3526 * dev_unicast_add - add a secondary unicast address
3528 * @addr: address to add
3529 * @alen: length of @addr
3531 * Add a secondary unicast address to the device or increase
3532 * the reference count if it already exists.
3534 * The caller must hold the rtnl_mutex.
3536 int dev_unicast_add(struct net_device *dev, void *addr, int alen)
3542 netif_addr_lock_bh(dev);
3543 err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3545 __dev_set_rx_mode(dev);
3546 netif_addr_unlock_bh(dev);
3549 EXPORT_SYMBOL(dev_unicast_add);
3551 int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
3552 struct dev_addr_list **from, int *from_count)
3554 struct dev_addr_list *da, *next;
3558 while (da != NULL) {
3560 if (!da->da_synced) {
3561 err = __dev_addr_add(to, to_count,
3562 da->da_addr, da->da_addrlen, 0);
3567 } else if (da->da_users == 1) {
3568 __dev_addr_delete(to, to_count,
3569 da->da_addr, da->da_addrlen, 0);
3570 __dev_addr_delete(from, from_count,
3571 da->da_addr, da->da_addrlen, 0);
3578 void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
3579 struct dev_addr_list **from, int *from_count)
3581 struct dev_addr_list *da, *next;
3584 while (da != NULL) {
3586 if (da->da_synced) {
3587 __dev_addr_delete(to, to_count,
3588 da->da_addr, da->da_addrlen, 0);
3590 __dev_addr_delete(from, from_count,
3591 da->da_addr, da->da_addrlen, 0);
3598 * dev_unicast_sync - Synchronize device's unicast list to another device
3599 * @to: destination device
3600 * @from: source device
3602 * Add newly added addresses to the destination device and release
3603 * addresses that have no users left. The source device must be
3604 * locked by netif_tx_lock_bh.
3606 * This function is intended to be called from the dev->set_rx_mode
3607 * function of layered software devices.
3609 int dev_unicast_sync(struct net_device *to, struct net_device *from)
3613 netif_addr_lock_bh(to);
3614 err = __dev_addr_sync(&to->uc_list, &to->uc_count,
3615 &from->uc_list, &from->uc_count);
3617 __dev_set_rx_mode(to);
3618 netif_addr_unlock_bh(to);
3621 EXPORT_SYMBOL(dev_unicast_sync);
3624 * dev_unicast_unsync - Remove synchronized addresses from the destination device
3625 * @to: destination device
3626 * @from: source device
3628 * Remove all addresses that were added to the destination device by
3629 * dev_unicast_sync(). This function is intended to be called from the
3630 * dev->stop function of layered software devices.
3632 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
3634 netif_addr_lock_bh(from);
3635 netif_addr_lock(to);
3637 __dev_addr_unsync(&to->uc_list, &to->uc_count,
3638 &from->uc_list, &from->uc_count);
3639 __dev_set_rx_mode(to);
3641 netif_addr_unlock(to);
3642 netif_addr_unlock_bh(from);
3644 EXPORT_SYMBOL(dev_unicast_unsync);
3646 static void __dev_addr_discard(struct dev_addr_list **list)
3648 struct dev_addr_list *tmp;
3650 while (*list != NULL) {
3653 if (tmp->da_users > tmp->da_gusers)
3654 printk("__dev_addr_discard: address leakage! "
3655 "da_users=%d\n", tmp->da_users);
3660 static void dev_addr_discard(struct net_device *dev)
3662 netif_addr_lock_bh(dev);
3664 __dev_addr_discard(&dev->uc_list);
3667 __dev_addr_discard(&dev->mc_list);
3670 netif_addr_unlock_bh(dev);
3674 * dev_get_flags - get flags reported to userspace
3677 * Get the combination of flag bits exported through APIs to userspace.
3679 unsigned dev_get_flags(const struct net_device *dev)
3683 flags = (dev->flags & ~(IFF_PROMISC |
3688 (dev->gflags & (IFF_PROMISC |
3691 if (netif_running(dev)) {
3692 if (netif_oper_up(dev))
3693 flags |= IFF_RUNNING;
3694 if (netif_carrier_ok(dev))
3695 flags |= IFF_LOWER_UP;
3696 if (netif_dormant(dev))
3697 flags |= IFF_DORMANT;
3704 * dev_change_flags - change device settings
3706 * @flags: device state flags
3708 * Change settings on device based state flags. The flags are
3709 * in the userspace exported format.
3711 int dev_change_flags(struct net_device *dev, unsigned flags)
3714 int old_flags = dev->flags;
3719 * Set the flags on our device.
3722 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
3723 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
3725 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
3729 * Load in the correct multicast list now the flags have changed.
3732 if ((old_flags ^ flags) & IFF_MULTICAST)
3733 dev_change_rx_flags(dev, IFF_MULTICAST);
3735 dev_set_rx_mode(dev);
3738 * Have we downed the interface. We handle IFF_UP ourselves
3739 * according to user attempts to set it, rather than blindly
3744 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
3745 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
3748 dev_set_rx_mode(dev);
3751 if (dev->flags & IFF_UP &&
3752 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
3754 call_netdevice_notifiers(NETDEV_CHANGE, dev);
3756 if ((flags ^ dev->gflags) & IFF_PROMISC) {
3757 int inc = (flags & IFF_PROMISC) ? +1 : -1;
3758 dev->gflags ^= IFF_PROMISC;
3759 dev_set_promiscuity(dev, inc);
3762 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
3763 is important. Some (broken) drivers set IFF_PROMISC, when
3764 IFF_ALLMULTI is requested not asking us and not reporting.
3766 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
3767 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
3768 dev->gflags ^= IFF_ALLMULTI;
3769 dev_set_allmulti(dev, inc);
3772 /* Exclude state transition flags, already notified */
3773 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
3775 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
3781 * dev_set_mtu - Change maximum transfer unit
3783 * @new_mtu: new transfer unit
3785 * Change the maximum transfer size of the network device.
3787 int dev_set_mtu(struct net_device *dev, int new_mtu)
3789 const struct net_device_ops *ops = dev->netdev_ops;
3792 if (new_mtu == dev->mtu)
3795 /* MTU must be positive. */
3799 if (!netif_device_present(dev))
3803 if (ops->ndo_change_mtu)
3804 err = ops->ndo_change_mtu(dev, new_mtu);
3808 if (!err && dev->flags & IFF_UP)
3809 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
3814 * dev_set_mac_address - Change Media Access Control Address
3818 * Change the hardware (MAC) address of the device
3820 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
3822 const struct net_device_ops *ops = dev->netdev_ops;
3825 if (!ops->ndo_set_mac_address)
3827 if (sa->sa_family != dev->type)
3829 if (!netif_device_present(dev))
3831 err = ops->ndo_set_mac_address(dev, sa);
3833 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3838 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
3840 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
3843 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3849 case SIOCGIFFLAGS: /* Get interface flags */
3850 ifr->ifr_flags = dev_get_flags(dev);
3853 case SIOCGIFMETRIC: /* Get the metric on the interface
3854 (currently unused) */
3855 ifr->ifr_metric = 0;
3858 case SIOCGIFMTU: /* Get the MTU of a device */
3859 ifr->ifr_mtu = dev->mtu;
3864 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
3866 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
3867 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3868 ifr->ifr_hwaddr.sa_family = dev->type;
3876 ifr->ifr_map.mem_start = dev->mem_start;
3877 ifr->ifr_map.mem_end = dev->mem_end;
3878 ifr->ifr_map.base_addr = dev->base_addr;
3879 ifr->ifr_map.irq = dev->irq;
3880 ifr->ifr_map.dma = dev->dma;
3881 ifr->ifr_map.port = dev->if_port;
3885 ifr->ifr_ifindex = dev->ifindex;
3889 ifr->ifr_qlen = dev->tx_queue_len;
3893 /* dev_ioctl() should ensure this case
3905 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
3907 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
3910 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3911 const struct net_device_ops *ops;
3916 ops = dev->netdev_ops;
3919 case SIOCSIFFLAGS: /* Set interface flags */
3920 return dev_change_flags(dev, ifr->ifr_flags);
3922 case SIOCSIFMETRIC: /* Set the metric on the interface
3923 (currently unused) */
3926 case SIOCSIFMTU: /* Set the MTU of a device */
3927 return dev_set_mtu(dev, ifr->ifr_mtu);
3930 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
3932 case SIOCSIFHWBROADCAST:
3933 if (ifr->ifr_hwaddr.sa_family != dev->type)
3935 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
3936 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3937 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3941 if (ops->ndo_set_config) {
3942 if (!netif_device_present(dev))
3944 return ops->ndo_set_config(dev, &ifr->ifr_map);
3949 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
3950 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3952 if (!netif_device_present(dev))
3954 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
3958 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
3959 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3961 if (!netif_device_present(dev))
3963 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
3967 if (ifr->ifr_qlen < 0)
3969 dev->tx_queue_len = ifr->ifr_qlen;
3973 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
3974 return dev_change_name(dev, ifr->ifr_newname);
3977 * Unknown or private ioctl
3981 if ((cmd >= SIOCDEVPRIVATE &&
3982 cmd <= SIOCDEVPRIVATE + 15) ||
3983 cmd == SIOCBONDENSLAVE ||
3984 cmd == SIOCBONDRELEASE ||
3985 cmd == SIOCBONDSETHWADDR ||
3986 cmd == SIOCBONDSLAVEINFOQUERY ||
3987 cmd == SIOCBONDINFOQUERY ||
3988 cmd == SIOCBONDCHANGEACTIVE ||
3989 cmd == SIOCGMIIPHY ||
3990 cmd == SIOCGMIIREG ||
3991 cmd == SIOCSMIIREG ||
3992 cmd == SIOCBRADDIF ||
3993 cmd == SIOCBRDELIF ||
3994 cmd == SIOCWANDEV) {
3996 if (ops->ndo_do_ioctl) {
3997 if (netif_device_present(dev))
3998 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4010 * This function handles all "interface"-type I/O control requests. The actual
4011 * 'doing' part of this is dev_ifsioc above.
4015 * dev_ioctl - network device ioctl
4016 * @net: the applicable net namespace
4017 * @cmd: command to issue
4018 * @arg: pointer to a struct ifreq in user space
4020 * Issue ioctl functions to devices. This is normally called by the
4021 * user space syscall interfaces but can sometimes be useful for
4022 * other purposes. The return value is the return from the syscall if
4023 * positive or a negative errno code on error.
4026 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4032 /* One special case: SIOCGIFCONF takes ifconf argument
4033 and requires shared lock, because it sleeps writing
4037 if (cmd == SIOCGIFCONF) {
4039 ret = dev_ifconf(net, (char __user *) arg);
4043 if (cmd == SIOCGIFNAME)
4044 return dev_ifname(net, (struct ifreq __user *)arg);
4046 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4049 ifr.ifr_name[IFNAMSIZ-1] = 0;
4051 colon = strchr(ifr.ifr_name, ':');
4056 * See which interface the caller is talking about.
4061 * These ioctl calls:
4062 * - can be done by all.
4063 * - atomic and do not require locking.
4074 dev_load(net, ifr.ifr_name);
4075 read_lock(&dev_base_lock);
4076 ret = dev_ifsioc_locked(net, &ifr, cmd);
4077 read_unlock(&dev_base_lock);
4081 if (copy_to_user(arg, &ifr,
4082 sizeof(struct ifreq)))
4088 dev_load(net, ifr.ifr_name);
4090 ret = dev_ethtool(net, &ifr);
4095 if (copy_to_user(arg, &ifr,
4096 sizeof(struct ifreq)))
4102 * These ioctl calls:
4103 * - require superuser power.
4104 * - require strict serialization.
4110 if (!capable(CAP_NET_ADMIN))
4112 dev_load(net, ifr.ifr_name);
4114 ret = dev_ifsioc(net, &ifr, cmd);
4119 if (copy_to_user(arg, &ifr,
4120 sizeof(struct ifreq)))
4126 * These ioctl calls:
4127 * - require superuser power.
4128 * - require strict serialization.
4129 * - do not return a value
4139 case SIOCSIFHWBROADCAST:
4142 case SIOCBONDENSLAVE:
4143 case SIOCBONDRELEASE:
4144 case SIOCBONDSETHWADDR:
4145 case SIOCBONDCHANGEACTIVE:
4148 if (!capable(CAP_NET_ADMIN))
4151 case SIOCBONDSLAVEINFOQUERY:
4152 case SIOCBONDINFOQUERY:
4153 dev_load(net, ifr.ifr_name);
4155 ret = dev_ifsioc(net, &ifr, cmd);
4160 /* Get the per device memory space. We can add this but
4161 * currently do not support it */
4163 /* Set the per device memory buffer space.
4164 * Not applicable in our case */
4169 * Unknown or private ioctl.
4172 if (cmd == SIOCWANDEV ||
4173 (cmd >= SIOCDEVPRIVATE &&
4174 cmd <= SIOCDEVPRIVATE + 15)) {
4175 dev_load(net, ifr.ifr_name);
4177 ret = dev_ifsioc(net, &ifr, cmd);
4179 if (!ret && copy_to_user(arg, &ifr,
4180 sizeof(struct ifreq)))
4184 /* Take care of Wireless Extensions */
4185 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4186 return wext_handle_ioctl(net, &ifr, cmd, arg);
4193 * dev_new_index - allocate an ifindex
4194 * @net: the applicable net namespace
4196 * Returns a suitable unique value for a new device interface
4197 * number. The caller must hold the rtnl semaphore or the
4198 * dev_base_lock to be sure it remains unique.
4200 static int dev_new_index(struct net *net)
4206 if (!__dev_get_by_index(net, ifindex))
4211 /* Delayed registration/unregisteration */
4212 static LIST_HEAD(net_todo_list);
4214 static void net_set_todo(struct net_device *dev)
4216 list_add_tail(&dev->todo_list, &net_todo_list);
4219 static void rollback_registered(struct net_device *dev)
4221 BUG_ON(dev_boot_phase);
4224 /* Some devices call without registering for initialization unwind. */
4225 if (dev->reg_state == NETREG_UNINITIALIZED) {
4226 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
4227 "was registered\n", dev->name, dev);
4233 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4235 /* If device is running, close it first. */
4238 /* And unlink it from device chain. */
4239 unlist_netdevice(dev);
4241 dev->reg_state = NETREG_UNREGISTERING;
4245 /* Shutdown queueing discipline. */
4249 /* Notify protocols, that we are about to destroy
4250 this device. They should clean all the things.
4252 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4255 * Flush the unicast and multicast chains
4257 dev_addr_discard(dev);
4259 if (dev->netdev_ops->ndo_uninit)
4260 dev->netdev_ops->ndo_uninit(dev);
4262 /* Notifier chain MUST detach us from master device. */
4263 WARN_ON(dev->master);
4265 /* Remove entries from kobject tree */
4266 netdev_unregister_kobject(dev);
4273 static void __netdev_init_queue_locks_one(struct net_device *dev,
4274 struct netdev_queue *dev_queue,
4277 spin_lock_init(&dev_queue->_xmit_lock);
4278 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4279 dev_queue->xmit_lock_owner = -1;
4282 static void netdev_init_queue_locks(struct net_device *dev)
4284 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4285 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4288 unsigned long netdev_fix_features(unsigned long features, const char *name)
4290 /* Fix illegal SG+CSUM combinations. */
4291 if ((features & NETIF_F_SG) &&
4292 !(features & NETIF_F_ALL_CSUM)) {
4294 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4295 "checksum feature.\n", name);
4296 features &= ~NETIF_F_SG;
4299 /* TSO requires that SG is present as well. */
4300 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4302 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4303 "SG feature.\n", name);
4304 features &= ~NETIF_F_TSO;
4307 if (features & NETIF_F_UFO) {
4308 if (!(features & NETIF_F_GEN_CSUM)) {
4310 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4311 "since no NETIF_F_HW_CSUM feature.\n",
4313 features &= ~NETIF_F_UFO;
4316 if (!(features & NETIF_F_SG)) {
4318 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4319 "since no NETIF_F_SG feature.\n", name);
4320 features &= ~NETIF_F_UFO;
4326 EXPORT_SYMBOL(netdev_fix_features);
4329 * register_netdevice - register a network device
4330 * @dev: device to register
4332 * Take a completed network device structure and add it to the kernel
4333 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4334 * chain. 0 is returned on success. A negative errno code is returned
4335 * on a failure to set up the device, or if the name is a duplicate.
4337 * Callers must hold the rtnl semaphore. You may want
4338 * register_netdev() instead of this.
4341 * The locking appears insufficient to guarantee two parallel registers
4342 * will not get the same name.
4345 int register_netdevice(struct net_device *dev)
4347 struct hlist_head *head;
4348 struct hlist_node *p;
4350 struct net *net = dev_net(dev);
4352 BUG_ON(dev_boot_phase);
4357 /* When net_device's are persistent, this will be fatal. */
4358 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4361 spin_lock_init(&dev->addr_list_lock);
4362 netdev_set_addr_lockdep_class(dev);
4363 netdev_init_queue_locks(dev);
4367 #ifdef CONFIG_COMPAT_NET_DEV_OPS
4368 /* Netdevice_ops API compatiability support.
4369 * This is temporary until all network devices are converted.
4371 if (dev->netdev_ops) {
4372 const struct net_device_ops *ops = dev->netdev_ops;
4374 dev->init = ops->ndo_init;
4375 dev->uninit = ops->ndo_uninit;
4376 dev->open = ops->ndo_open;
4377 dev->change_rx_flags = ops->ndo_change_rx_flags;
4378 dev->set_rx_mode = ops->ndo_set_rx_mode;
4379 dev->set_multicast_list = ops->ndo_set_multicast_list;
4380 dev->set_mac_address = ops->ndo_set_mac_address;
4381 dev->validate_addr = ops->ndo_validate_addr;
4382 dev->do_ioctl = ops->ndo_do_ioctl;
4383 dev->set_config = ops->ndo_set_config;
4384 dev->change_mtu = ops->ndo_change_mtu;
4385 dev->tx_timeout = ops->ndo_tx_timeout;
4386 dev->get_stats = ops->ndo_get_stats;
4387 dev->vlan_rx_register = ops->ndo_vlan_rx_register;
4388 dev->vlan_rx_add_vid = ops->ndo_vlan_rx_add_vid;
4389 dev->vlan_rx_kill_vid = ops->ndo_vlan_rx_kill_vid;
4390 #ifdef CONFIG_NET_POLL_CONTROLLER
4391 dev->poll_controller = ops->ndo_poll_controller;
4394 char drivername[64];
4395 pr_info("%s (%s): not using net_device_ops yet\n",
4396 dev->name, netdev_drivername(dev, drivername, 64));
4398 /* This works only because net_device_ops and the
4399 compatiablity structure are the same. */
4400 dev->netdev_ops = (void *) &(dev->init);
4404 /* Init, if this function is available */
4405 if (dev->netdev_ops->ndo_init) {
4406 ret = dev->netdev_ops->ndo_init(dev);
4414 if (!dev_valid_name(dev->name)) {
4419 dev->ifindex = dev_new_index(net);
4420 if (dev->iflink == -1)
4421 dev->iflink = dev->ifindex;
4423 /* Check for existence of name */
4424 head = dev_name_hash(net, dev->name);
4425 hlist_for_each(p, head) {
4426 struct net_device *d
4427 = hlist_entry(p, struct net_device, name_hlist);
4428 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
4434 /* Fix illegal checksum combinations */
4435 if ((dev->features & NETIF_F_HW_CSUM) &&
4436 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4437 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4439 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4442 if ((dev->features & NETIF_F_NO_CSUM) &&
4443 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4444 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4446 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4449 dev->features = netdev_fix_features(dev->features, dev->name);
4451 /* Enable software GSO if SG is supported. */
4452 if (dev->features & NETIF_F_SG)
4453 dev->features |= NETIF_F_GSO;
4455 netdev_initialize_kobject(dev);
4456 ret = netdev_register_kobject(dev);
4459 dev->reg_state = NETREG_REGISTERED;
4462 * Default initial state at registry is that the
4463 * device is present.
4466 set_bit(__LINK_STATE_PRESENT, &dev->state);
4468 dev_init_scheduler(dev);
4470 list_netdevice(dev);
4472 /* Notify protocols, that a new device appeared. */
4473 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4474 ret = notifier_to_errno(ret);
4476 rollback_registered(dev);
4477 dev->reg_state = NETREG_UNREGISTERED;
4484 if (dev->netdev_ops->ndo_uninit)
4485 dev->netdev_ops->ndo_uninit(dev);
4490 * init_dummy_netdev - init a dummy network device for NAPI
4491 * @dev: device to init
4493 * This takes a network device structure and initialize the minimum
4494 * amount of fields so it can be used to schedule NAPI polls without
4495 * registering a full blown interface. This is to be used by drivers
4496 * that need to tie several hardware interfaces to a single NAPI
4497 * poll scheduler due to HW limitations.
4499 int init_dummy_netdev(struct net_device *dev)
4501 /* Clear everything. Note we don't initialize spinlocks
4502 * are they aren't supposed to be taken by any of the
4503 * NAPI code and this dummy netdev is supposed to be
4504 * only ever used for NAPI polls
4506 memset(dev, 0, sizeof(struct net_device));
4508 /* make sure we BUG if trying to hit standard
4509 * register/unregister code path
4511 dev->reg_state = NETREG_DUMMY;
4513 /* initialize the ref count */
4514 atomic_set(&dev->refcnt, 1);
4516 /* NAPI wants this */
4517 INIT_LIST_HEAD(&dev->napi_list);
4519 /* a dummy interface is started by default */
4520 set_bit(__LINK_STATE_PRESENT, &dev->state);
4521 set_bit(__LINK_STATE_START, &dev->state);
4525 EXPORT_SYMBOL_GPL(init_dummy_netdev);
4529 * register_netdev - register a network device
4530 * @dev: device to register
4532 * Take a completed network device structure and add it to the kernel
4533 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4534 * chain. 0 is returned on success. A negative errno code is returned
4535 * on a failure to set up the device, or if the name is a duplicate.
4537 * This is a wrapper around register_netdevice that takes the rtnl semaphore
4538 * and expands the device name if you passed a format string to
4541 int register_netdev(struct net_device *dev)
4548 * If the name is a format string the caller wants us to do a
4551 if (strchr(dev->name, '%')) {
4552 err = dev_alloc_name(dev, dev->name);
4557 err = register_netdevice(dev);
4562 EXPORT_SYMBOL(register_netdev);
4565 * netdev_wait_allrefs - wait until all references are gone.
4567 * This is called when unregistering network devices.
4569 * Any protocol or device that holds a reference should register
4570 * for netdevice notification, and cleanup and put back the
4571 * reference if they receive an UNREGISTER event.
4572 * We can get stuck here if buggy protocols don't correctly
4575 static void netdev_wait_allrefs(struct net_device *dev)
4577 unsigned long rebroadcast_time, warning_time;
4579 rebroadcast_time = warning_time = jiffies;
4580 while (atomic_read(&dev->refcnt) != 0) {
4581 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
4584 /* Rebroadcast unregister notification */
4585 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4587 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
4589 /* We must not have linkwatch events
4590 * pending on unregister. If this
4591 * happens, we simply run the queue
4592 * unscheduled, resulting in a noop
4595 linkwatch_run_queue();
4600 rebroadcast_time = jiffies;
4605 if (time_after(jiffies, warning_time + 10 * HZ)) {
4606 printk(KERN_EMERG "unregister_netdevice: "
4607 "waiting for %s to become free. Usage "
4609 dev->name, atomic_read(&dev->refcnt));
4610 warning_time = jiffies;
4619 * register_netdevice(x1);
4620 * register_netdevice(x2);
4622 * unregister_netdevice(y1);
4623 * unregister_netdevice(y2);
4629 * We are invoked by rtnl_unlock().
4630 * This allows us to deal with problems:
4631 * 1) We can delete sysfs objects which invoke hotplug
4632 * without deadlocking with linkwatch via keventd.
4633 * 2) Since we run with the RTNL semaphore not held, we can sleep
4634 * safely in order to wait for the netdev refcnt to drop to zero.
4636 * We must not return until all unregister events added during
4637 * the interval the lock was held have been completed.
4639 void netdev_run_todo(void)
4641 struct list_head list;
4643 /* Snapshot list, allow later requests */
4644 list_replace_init(&net_todo_list, &list);
4648 while (!list_empty(&list)) {
4649 struct net_device *dev
4650 = list_entry(list.next, struct net_device, todo_list);
4651 list_del(&dev->todo_list);
4653 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
4654 printk(KERN_ERR "network todo '%s' but state %d\n",
4655 dev->name, dev->reg_state);
4660 dev->reg_state = NETREG_UNREGISTERED;
4662 on_each_cpu(flush_backlog, dev, 1);
4664 netdev_wait_allrefs(dev);
4667 BUG_ON(atomic_read(&dev->refcnt));
4668 WARN_ON(dev->ip_ptr);
4669 WARN_ON(dev->ip6_ptr);
4670 WARN_ON(dev->dn_ptr);
4672 if (dev->destructor)
4673 dev->destructor(dev);
4675 /* Free network device */
4676 kobject_put(&dev->dev.kobj);
4681 * dev_get_stats - get network device statistics
4682 * @dev: device to get statistics from
4684 * Get network statistics from device. The device driver may provide
4685 * its own method by setting dev->netdev_ops->get_stats; otherwise
4686 * the internal statistics structure is used.
4688 const struct net_device_stats *dev_get_stats(struct net_device *dev)
4690 const struct net_device_ops *ops = dev->netdev_ops;
4692 if (ops->ndo_get_stats)
4693 return ops->ndo_get_stats(dev);
4697 EXPORT_SYMBOL(dev_get_stats);
4699 static void netdev_init_one_queue(struct net_device *dev,
4700 struct netdev_queue *queue,
4706 static void netdev_init_queues(struct net_device *dev)
4708 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
4709 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
4710 spin_lock_init(&dev->tx_global_lock);
4714 * alloc_netdev_mq - allocate network device
4715 * @sizeof_priv: size of private data to allocate space for
4716 * @name: device name format string
4717 * @setup: callback to initialize device
4718 * @queue_count: the number of subqueues to allocate
4720 * Allocates a struct net_device with private data area for driver use
4721 * and performs basic initialization. Also allocates subquue structs
4722 * for each queue on the device at the end of the netdevice.
4724 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
4725 void (*setup)(struct net_device *), unsigned int queue_count)
4727 struct netdev_queue *tx;
4728 struct net_device *dev;
4732 BUG_ON(strlen(name) >= sizeof(dev->name));
4734 alloc_size = sizeof(struct net_device);
4736 /* ensure 32-byte alignment of private area */
4737 alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
4738 alloc_size += sizeof_priv;
4740 /* ensure 32-byte alignment of whole construct */
4741 alloc_size += NETDEV_ALIGN_CONST;
4743 p = kzalloc(alloc_size, GFP_KERNEL);
4745 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
4749 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
4751 printk(KERN_ERR "alloc_netdev: Unable to allocate "
4757 dev = (struct net_device *)
4758 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4759 dev->padded = (char *)dev - (char *)p;
4760 dev_net_set(dev, &init_net);
4763 dev->num_tx_queues = queue_count;
4764 dev->real_num_tx_queues = queue_count;
4766 dev->gso_max_size = GSO_MAX_SIZE;
4768 netdev_init_queues(dev);
4770 INIT_LIST_HEAD(&dev->napi_list);
4772 strcpy(dev->name, name);
4775 EXPORT_SYMBOL(alloc_netdev_mq);
4778 * free_netdev - free network device
4781 * This function does the last stage of destroying an allocated device
4782 * interface. The reference to the device object is released.
4783 * If this is the last reference then it will be freed.
4785 void free_netdev(struct net_device *dev)
4787 struct napi_struct *p, *n;
4789 release_net(dev_net(dev));
4793 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
4796 /* Compatibility with error handling in drivers */
4797 if (dev->reg_state == NETREG_UNINITIALIZED) {
4798 kfree((char *)dev - dev->padded);
4802 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
4803 dev->reg_state = NETREG_RELEASED;
4805 /* will free via device release */
4806 put_device(&dev->dev);
4810 * synchronize_net - Synchronize with packet receive processing
4812 * Wait for packets currently being received to be done.
4813 * Does not block later packets from starting.
4815 void synchronize_net(void)
4822 * unregister_netdevice - remove device from the kernel
4825 * This function shuts down a device interface and removes it
4826 * from the kernel tables.
4828 * Callers must hold the rtnl semaphore. You may want
4829 * unregister_netdev() instead of this.
4832 void unregister_netdevice(struct net_device *dev)
4836 rollback_registered(dev);
4837 /* Finish processing unregister after unlock */
4842 * unregister_netdev - remove device from the kernel
4845 * This function shuts down a device interface and removes it
4846 * from the kernel tables.
4848 * This is just a wrapper for unregister_netdevice that takes
4849 * the rtnl semaphore. In general you want to use this and not
4850 * unregister_netdevice.
4852 void unregister_netdev(struct net_device *dev)
4855 unregister_netdevice(dev);
4859 EXPORT_SYMBOL(unregister_netdev);
4862 * dev_change_net_namespace - move device to different nethost namespace
4864 * @net: network namespace
4865 * @pat: If not NULL name pattern to try if the current device name
4866 * is already taken in the destination network namespace.
4868 * This function shuts down a device interface and moves it
4869 * to a new network namespace. On success 0 is returned, on
4870 * a failure a netagive errno code is returned.
4872 * Callers must hold the rtnl semaphore.
4875 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
4878 const char *destname;
4883 /* Don't allow namespace local devices to be moved. */
4885 if (dev->features & NETIF_F_NETNS_LOCAL)
4889 /* Don't allow real devices to be moved when sysfs
4893 if (dev->dev.parent)
4897 /* Ensure the device has been registrered */
4899 if (dev->reg_state != NETREG_REGISTERED)
4902 /* Get out if there is nothing todo */
4904 if (net_eq(dev_net(dev), net))
4907 /* Pick the destination device name, and ensure
4908 * we can use it in the destination network namespace.
4911 destname = dev->name;
4912 if (__dev_get_by_name(net, destname)) {
4913 /* We get here if we can't use the current device name */
4916 if (!dev_valid_name(pat))
4918 if (strchr(pat, '%')) {
4919 if (__dev_alloc_name(net, pat, buf) < 0)
4924 if (__dev_get_by_name(net, destname))
4929 * And now a mini version of register_netdevice unregister_netdevice.
4932 /* If device is running close it first. */
4935 /* And unlink it from device chain */
4937 unlist_netdevice(dev);
4941 /* Shutdown queueing discipline. */
4944 /* Notify protocols, that we are about to destroy
4945 this device. They should clean all the things.
4947 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4950 * Flush the unicast and multicast chains
4952 dev_addr_discard(dev);
4954 netdev_unregister_kobject(dev);
4956 /* Actually switch the network namespace */
4957 dev_net_set(dev, net);
4959 /* Assign the new device name */
4960 if (destname != dev->name)
4961 strcpy(dev->name, destname);
4963 /* If there is an ifindex conflict assign a new one */
4964 if (__dev_get_by_index(net, dev->ifindex)) {
4965 int iflink = (dev->iflink == dev->ifindex);
4966 dev->ifindex = dev_new_index(net);
4968 dev->iflink = dev->ifindex;
4971 /* Fixup kobjects */
4972 err = netdev_register_kobject(dev);
4975 /* Add the device back in the hashes */
4976 list_netdevice(dev);
4978 /* Notify protocols, that a new device appeared. */
4979 call_netdevice_notifiers(NETDEV_REGISTER, dev);
4987 static int dev_cpu_callback(struct notifier_block *nfb,
4988 unsigned long action,
4991 struct sk_buff **list_skb;
4992 struct Qdisc **list_net;
4993 struct sk_buff *skb;
4994 unsigned int cpu, oldcpu = (unsigned long)ocpu;
4995 struct softnet_data *sd, *oldsd;
4997 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5000 local_irq_disable();
5001 cpu = smp_processor_id();
5002 sd = &per_cpu(softnet_data, cpu);
5003 oldsd = &per_cpu(softnet_data, oldcpu);
5005 /* Find end of our completion_queue. */
5006 list_skb = &sd->completion_queue;
5008 list_skb = &(*list_skb)->next;
5009 /* Append completion queue from offline CPU. */
5010 *list_skb = oldsd->completion_queue;
5011 oldsd->completion_queue = NULL;
5013 /* Find end of our output_queue. */
5014 list_net = &sd->output_queue;
5016 list_net = &(*list_net)->next_sched;
5017 /* Append output queue from offline CPU. */
5018 *list_net = oldsd->output_queue;
5019 oldsd->output_queue = NULL;
5021 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5024 /* Process offline CPU's input_pkt_queue */
5025 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
5033 * netdev_increment_features - increment feature set by one
5034 * @all: current feature set
5035 * @one: new feature set
5036 * @mask: mask feature set
5038 * Computes a new feature set after adding a device with feature set
5039 * @one to the master device with current feature set @all. Will not
5040 * enable anything that is off in @mask. Returns the new feature set.
5042 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5045 /* If device needs checksumming, downgrade to it. */
5046 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5047 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5048 else if (mask & NETIF_F_ALL_CSUM) {
5049 /* If one device supports v4/v6 checksumming, set for all. */
5050 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5051 !(all & NETIF_F_GEN_CSUM)) {
5052 all &= ~NETIF_F_ALL_CSUM;
5053 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5056 /* If one device supports hw checksumming, set for all. */
5057 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5058 all &= ~NETIF_F_ALL_CSUM;
5059 all |= NETIF_F_HW_CSUM;
5063 one |= NETIF_F_ALL_CSUM;
5065 one |= all & NETIF_F_ONE_FOR_ALL;
5066 all &= one | NETIF_F_LLTX | NETIF_F_GSO;
5067 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5071 EXPORT_SYMBOL(netdev_increment_features);
5073 static struct hlist_head *netdev_create_hash(void)
5076 struct hlist_head *hash;
5078 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5080 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5081 INIT_HLIST_HEAD(&hash[i]);
5086 /* Initialize per network namespace state */
5087 static int __net_init netdev_init(struct net *net)
5089 INIT_LIST_HEAD(&net->dev_base_head);
5091 net->dev_name_head = netdev_create_hash();
5092 if (net->dev_name_head == NULL)
5095 net->dev_index_head = netdev_create_hash();
5096 if (net->dev_index_head == NULL)
5102 kfree(net->dev_name_head);
5108 * netdev_drivername - network driver for the device
5109 * @dev: network device
5110 * @buffer: buffer for resulting name
5111 * @len: size of buffer
5113 * Determine network driver for device.
5115 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5117 const struct device_driver *driver;
5118 const struct device *parent;
5120 if (len <= 0 || !buffer)
5124 parent = dev->dev.parent;
5129 driver = parent->driver;
5130 if (driver && driver->name)
5131 strlcpy(buffer, driver->name, len);
5135 static void __net_exit netdev_exit(struct net *net)
5137 kfree(net->dev_name_head);
5138 kfree(net->dev_index_head);
5141 static struct pernet_operations __net_initdata netdev_net_ops = {
5142 .init = netdev_init,
5143 .exit = netdev_exit,
5146 static void __net_exit default_device_exit(struct net *net)
5148 struct net_device *dev;
5150 * Push all migratable of the network devices back to the
5151 * initial network namespace
5155 for_each_netdev(net, dev) {
5157 char fb_name[IFNAMSIZ];
5159 /* Ignore unmoveable devices (i.e. loopback) */
5160 if (dev->features & NETIF_F_NETNS_LOCAL)
5163 /* Delete virtual devices */
5164 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) {
5165 dev->rtnl_link_ops->dellink(dev);
5169 /* Push remaing network devices to init_net */
5170 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5171 err = dev_change_net_namespace(dev, &init_net, fb_name);
5173 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5174 __func__, dev->name, err);
5182 static struct pernet_operations __net_initdata default_device_ops = {
5183 .exit = default_device_exit,
5187 * Initialize the DEV module. At boot time this walks the device list and
5188 * unhooks any devices that fail to initialise (normally hardware not
5189 * present) and leaves us with a valid list of present and active devices.
5194 * This is called single threaded during boot, so no need
5195 * to take the rtnl semaphore.
5197 static int __init net_dev_init(void)
5199 int i, rc = -ENOMEM;
5201 BUG_ON(!dev_boot_phase);
5203 if (dev_proc_init())
5206 if (netdev_kobject_init())
5209 INIT_LIST_HEAD(&ptype_all);
5210 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5211 INIT_LIST_HEAD(&ptype_base[i]);
5213 if (register_pernet_subsys(&netdev_net_ops))
5217 * Initialise the packet receive queues.
5220 for_each_possible_cpu(i) {
5221 struct softnet_data *queue;
5223 queue = &per_cpu(softnet_data, i);
5224 skb_queue_head_init(&queue->input_pkt_queue);
5225 queue->completion_queue = NULL;
5226 INIT_LIST_HEAD(&queue->poll_list);
5228 queue->backlog.poll = process_backlog;
5229 queue->backlog.weight = weight_p;
5230 queue->backlog.gro_list = NULL;
5231 queue->backlog.gro_count = 0;
5236 /* The loopback device is special if any other network devices
5237 * is present in a network namespace the loopback device must
5238 * be present. Since we now dynamically allocate and free the
5239 * loopback device ensure this invariant is maintained by
5240 * keeping the loopback device as the first device on the
5241 * list of network devices. Ensuring the loopback devices
5242 * is the first device that appears and the last network device
5245 if (register_pernet_device(&loopback_net_ops))
5248 if (register_pernet_device(&default_device_ops))
5251 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5252 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5254 hotcpu_notifier(dev_cpu_callback, 0);
5262 subsys_initcall(net_dev_init);
5264 EXPORT_SYMBOL(__dev_get_by_index);
5265 EXPORT_SYMBOL(__dev_get_by_name);
5266 EXPORT_SYMBOL(__dev_remove_pack);
5267 EXPORT_SYMBOL(dev_valid_name);
5268 EXPORT_SYMBOL(dev_add_pack);
5269 EXPORT_SYMBOL(dev_alloc_name);
5270 EXPORT_SYMBOL(dev_close);
5271 EXPORT_SYMBOL(dev_get_by_flags);
5272 EXPORT_SYMBOL(dev_get_by_index);
5273 EXPORT_SYMBOL(dev_get_by_name);
5274 EXPORT_SYMBOL(dev_open);
5275 EXPORT_SYMBOL(dev_queue_xmit);
5276 EXPORT_SYMBOL(dev_remove_pack);
5277 EXPORT_SYMBOL(dev_set_allmulti);
5278 EXPORT_SYMBOL(dev_set_promiscuity);
5279 EXPORT_SYMBOL(dev_change_flags);
5280 EXPORT_SYMBOL(dev_set_mtu);
5281 EXPORT_SYMBOL(dev_set_mac_address);
5282 EXPORT_SYMBOL(free_netdev);
5283 EXPORT_SYMBOL(netdev_boot_setup_check);
5284 EXPORT_SYMBOL(netdev_set_master);
5285 EXPORT_SYMBOL(netdev_state_change);
5286 EXPORT_SYMBOL(netif_receive_skb);
5287 EXPORT_SYMBOL(netif_rx);
5288 EXPORT_SYMBOL(register_gifconf);
5289 EXPORT_SYMBOL(register_netdevice);
5290 EXPORT_SYMBOL(register_netdevice_notifier);
5291 EXPORT_SYMBOL(skb_checksum_help);
5292 EXPORT_SYMBOL(synchronize_net);
5293 EXPORT_SYMBOL(unregister_netdevice);
5294 EXPORT_SYMBOL(unregister_netdevice_notifier);
5295 EXPORT_SYMBOL(net_enable_timestamp);
5296 EXPORT_SYMBOL(net_disable_timestamp);
5297 EXPORT_SYMBOL(dev_get_flags);
5299 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
5300 EXPORT_SYMBOL(br_handle_frame_hook);
5301 EXPORT_SYMBOL(br_fdb_get_hook);
5302 EXPORT_SYMBOL(br_fdb_put_hook);
5305 EXPORT_SYMBOL(dev_load);
5307 EXPORT_PER_CPU_SYMBOL(softnet_data);