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;
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);
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);
2284 type = skb->protocol;
2285 list_for_each_entry_rcu(ptype,
2286 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2287 if (ptype->type == type &&
2288 (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2289 ptype->dev == orig_dev)) {
2291 ret = deliver_skb(skb, pt_prev, orig_dev);
2297 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2300 /* Jamal, now you will not able to escape explaining
2301 * me how you were going to use this. :-)
2311 /* Network device is going away, flush any packets still pending */
2312 static void flush_backlog(void *arg)
2314 struct net_device *dev = arg;
2315 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2316 struct sk_buff *skb, *tmp;
2318 skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp)
2319 if (skb->dev == dev) {
2320 __skb_unlink(skb, &queue->input_pkt_queue);
2325 static int napi_gro_complete(struct sk_buff *skb)
2327 struct packet_type *ptype;
2328 __be16 type = skb->protocol;
2329 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2332 if (NAPI_GRO_CB(skb)->count == 1)
2336 list_for_each_entry_rcu(ptype, head, list) {
2337 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2340 err = ptype->gro_complete(skb);
2346 WARN_ON(&ptype->list == head);
2348 return NET_RX_SUCCESS;
2352 skb_shinfo(skb)->gso_size = 0;
2353 __skb_push(skb, -skb_network_offset(skb));
2354 return netif_receive_skb(skb);
2357 void napi_gro_flush(struct napi_struct *napi)
2359 struct sk_buff *skb, *next;
2361 for (skb = napi->gro_list; skb; skb = next) {
2364 napi_gro_complete(skb);
2367 napi->gro_list = NULL;
2369 EXPORT_SYMBOL(napi_gro_flush);
2371 int dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2373 struct sk_buff **pp = NULL;
2374 struct packet_type *ptype;
2375 __be16 type = skb->protocol;
2376 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2382 if (!(skb->dev->features & NETIF_F_GRO))
2385 if (skb_is_gso(skb) || skb_shinfo(skb)->frag_list)
2389 list_for_each_entry_rcu(ptype, head, list) {
2392 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
2395 skb_reset_network_header(skb);
2396 mac_len = skb->network_header - skb->mac_header;
2397 skb->mac_len = mac_len;
2398 NAPI_GRO_CB(skb)->same_flow = 0;
2399 NAPI_GRO_CB(skb)->flush = 0;
2400 NAPI_GRO_CB(skb)->free = 0;
2402 for (p = napi->gro_list; p; p = p->next) {
2405 if (!NAPI_GRO_CB(p)->same_flow)
2408 if (p->mac_len != mac_len ||
2409 memcmp(skb_mac_header(p), skb_mac_header(skb),
2411 NAPI_GRO_CB(p)->same_flow = 0;
2414 pp = ptype->gro_receive(&napi->gro_list, skb);
2419 if (&ptype->list == head)
2422 same_flow = NAPI_GRO_CB(skb)->same_flow;
2423 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
2426 struct sk_buff *nskb = *pp;
2430 napi_gro_complete(nskb);
2437 if (NAPI_GRO_CB(skb)->flush || count >= MAX_GRO_SKBS) {
2438 __skb_push(skb, -skb_network_offset(skb));
2442 NAPI_GRO_CB(skb)->count = 1;
2443 skb_shinfo(skb)->gso_size = skb->len;
2444 skb->next = napi->gro_list;
2445 napi->gro_list = skb;
2454 EXPORT_SYMBOL(dev_gro_receive);
2456 static int __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2460 for (p = napi->gro_list; p; p = p->next) {
2461 NAPI_GRO_CB(p)->same_flow = 1;
2462 NAPI_GRO_CB(p)->flush = 0;
2465 return dev_gro_receive(napi, skb);
2468 int napi_skb_finish(int ret, struct sk_buff *skb)
2470 int err = NET_RX_SUCCESS;
2474 return netif_receive_skb(skb);
2480 case GRO_MERGED_FREE:
2487 EXPORT_SYMBOL(napi_skb_finish);
2489 int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2491 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
2493 EXPORT_SYMBOL(napi_gro_receive);
2495 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
2497 __skb_pull(skb, skb_headlen(skb));
2498 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
2502 EXPORT_SYMBOL(napi_reuse_skb);
2504 struct sk_buff *napi_fraginfo_skb(struct napi_struct *napi,
2505 struct napi_gro_fraginfo *info)
2507 struct net_device *dev = napi->dev;
2508 struct sk_buff *skb = napi->skb;
2513 skb = netdev_alloc_skb(dev, GRO_MAX_HEAD + NET_IP_ALIGN);
2517 skb_reserve(skb, NET_IP_ALIGN);
2520 BUG_ON(info->nr_frags > MAX_SKB_FRAGS);
2521 skb_shinfo(skb)->nr_frags = info->nr_frags;
2522 memcpy(skb_shinfo(skb)->frags, info->frags, sizeof(info->frags));
2524 skb->data_len = info->len;
2525 skb->len += info->len;
2526 skb->truesize += info->len;
2528 if (!pskb_may_pull(skb, ETH_HLEN)) {
2529 napi_reuse_skb(napi, skb);
2534 skb->protocol = eth_type_trans(skb, dev);
2536 skb->ip_summed = info->ip_summed;
2537 skb->csum = info->csum;
2542 EXPORT_SYMBOL(napi_fraginfo_skb);
2544 int napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, int ret)
2546 int err = NET_RX_SUCCESS;
2550 return netif_receive_skb(skb);
2556 case GRO_MERGED_FREE:
2557 napi_reuse_skb(napi, skb);
2563 EXPORT_SYMBOL(napi_frags_finish);
2565 int napi_gro_frags(struct napi_struct *napi, struct napi_gro_fraginfo *info)
2567 struct sk_buff *skb = napi_fraginfo_skb(napi, info);
2572 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
2574 EXPORT_SYMBOL(napi_gro_frags);
2576 static int process_backlog(struct napi_struct *napi, int quota)
2579 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2580 unsigned long start_time = jiffies;
2582 napi->weight = weight_p;
2584 struct sk_buff *skb;
2586 local_irq_disable();
2587 skb = __skb_dequeue(&queue->input_pkt_queue);
2589 __napi_complete(napi);
2595 napi_gro_receive(napi, skb);
2596 } while (++work < quota && jiffies == start_time);
2598 napi_gro_flush(napi);
2604 * __napi_schedule - schedule for receive
2605 * @n: entry to schedule
2607 * The entry's receive function will be scheduled to run
2609 void __napi_schedule(struct napi_struct *n)
2611 unsigned long flags;
2613 local_irq_save(flags);
2614 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2615 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2616 local_irq_restore(flags);
2618 EXPORT_SYMBOL(__napi_schedule);
2620 void __napi_complete(struct napi_struct *n)
2622 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
2623 BUG_ON(n->gro_list);
2625 list_del(&n->poll_list);
2626 smp_mb__before_clear_bit();
2627 clear_bit(NAPI_STATE_SCHED, &n->state);
2629 EXPORT_SYMBOL(__napi_complete);
2631 void napi_complete(struct napi_struct *n)
2633 unsigned long flags;
2636 * don't let napi dequeue from the cpu poll list
2637 * just in case its running on a different cpu
2639 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
2643 local_irq_save(flags);
2645 local_irq_restore(flags);
2647 EXPORT_SYMBOL(napi_complete);
2649 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
2650 int (*poll)(struct napi_struct *, int), int weight)
2652 INIT_LIST_HEAD(&napi->poll_list);
2653 napi->gro_list = NULL;
2656 napi->weight = weight;
2657 list_add(&napi->dev_list, &dev->napi_list);
2659 #ifdef CONFIG_NETPOLL
2660 spin_lock_init(&napi->poll_lock);
2661 napi->poll_owner = -1;
2663 set_bit(NAPI_STATE_SCHED, &napi->state);
2665 EXPORT_SYMBOL(netif_napi_add);
2667 void netif_napi_del(struct napi_struct *napi)
2669 struct sk_buff *skb, *next;
2671 list_del_init(&napi->dev_list);
2674 for (skb = napi->gro_list; skb; skb = next) {
2680 napi->gro_list = NULL;
2682 EXPORT_SYMBOL(netif_napi_del);
2685 static void net_rx_action(struct softirq_action *h)
2687 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2688 unsigned long time_limit = jiffies + 2;
2689 int budget = netdev_budget;
2692 local_irq_disable();
2694 while (!list_empty(list)) {
2695 struct napi_struct *n;
2698 /* If softirq window is exhuasted then punt.
2699 * Allow this to run for 2 jiffies since which will allow
2700 * an average latency of 1.5/HZ.
2702 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
2707 /* Even though interrupts have been re-enabled, this
2708 * access is safe because interrupts can only add new
2709 * entries to the tail of this list, and only ->poll()
2710 * calls can remove this head entry from the list.
2712 n = list_entry(list->next, struct napi_struct, poll_list);
2714 have = netpoll_poll_lock(n);
2718 /* This NAPI_STATE_SCHED test is for avoiding a race
2719 * with netpoll's poll_napi(). Only the entity which
2720 * obtains the lock and sees NAPI_STATE_SCHED set will
2721 * actually make the ->poll() call. Therefore we avoid
2722 * accidently calling ->poll() when NAPI is not scheduled.
2725 if (test_bit(NAPI_STATE_SCHED, &n->state))
2726 work = n->poll(n, weight);
2728 WARN_ON_ONCE(work > weight);
2732 local_irq_disable();
2734 /* Drivers must not modify the NAPI state if they
2735 * consume the entire weight. In such cases this code
2736 * still "owns" the NAPI instance and therefore can
2737 * move the instance around on the list at-will.
2739 if (unlikely(work == weight)) {
2740 if (unlikely(napi_disable_pending(n)))
2743 list_move_tail(&n->poll_list, list);
2746 netpoll_poll_unlock(have);
2751 #ifdef CONFIG_NET_DMA
2753 * There may not be any more sk_buffs coming right now, so push
2754 * any pending DMA copies to hardware
2756 dma_issue_pending_all();
2762 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2763 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2767 static gifconf_func_t * gifconf_list [NPROTO];
2770 * register_gifconf - register a SIOCGIF handler
2771 * @family: Address family
2772 * @gifconf: Function handler
2774 * Register protocol dependent address dumping routines. The handler
2775 * that is passed must not be freed or reused until it has been replaced
2776 * by another handler.
2778 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2780 if (family >= NPROTO)
2782 gifconf_list[family] = gifconf;
2788 * Map an interface index to its name (SIOCGIFNAME)
2792 * We need this ioctl for efficient implementation of the
2793 * if_indextoname() function required by the IPv6 API. Without
2794 * it, we would have to search all the interfaces to find a
2798 static int dev_ifname(struct net *net, struct ifreq __user *arg)
2800 struct net_device *dev;
2804 * Fetch the caller's info block.
2807 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2810 read_lock(&dev_base_lock);
2811 dev = __dev_get_by_index(net, ifr.ifr_ifindex);
2813 read_unlock(&dev_base_lock);
2817 strcpy(ifr.ifr_name, dev->name);
2818 read_unlock(&dev_base_lock);
2820 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2826 * Perform a SIOCGIFCONF call. This structure will change
2827 * size eventually, and there is nothing I can do about it.
2828 * Thus we will need a 'compatibility mode'.
2831 static int dev_ifconf(struct net *net, char __user *arg)
2834 struct net_device *dev;
2841 * Fetch the caller's info block.
2844 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2851 * Loop over the interfaces, and write an info block for each.
2855 for_each_netdev(net, dev) {
2856 for (i = 0; i < NPROTO; i++) {
2857 if (gifconf_list[i]) {
2860 done = gifconf_list[i](dev, NULL, 0);
2862 done = gifconf_list[i](dev, pos + total,
2872 * All done. Write the updated control block back to the caller.
2874 ifc.ifc_len = total;
2877 * Both BSD and Solaris return 0 here, so we do too.
2879 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2882 #ifdef CONFIG_PROC_FS
2884 * This is invoked by the /proc filesystem handler to display a device
2887 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2888 __acquires(dev_base_lock)
2890 struct net *net = seq_file_net(seq);
2892 struct net_device *dev;
2894 read_lock(&dev_base_lock);
2896 return SEQ_START_TOKEN;
2899 for_each_netdev(net, dev)
2906 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2908 struct net *net = seq_file_net(seq);
2910 return v == SEQ_START_TOKEN ?
2911 first_net_device(net) : next_net_device((struct net_device *)v);
2914 void dev_seq_stop(struct seq_file *seq, void *v)
2915 __releases(dev_base_lock)
2917 read_unlock(&dev_base_lock);
2920 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2922 const struct net_device_stats *stats = dev_get_stats(dev);
2924 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2925 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2926 dev->name, stats->rx_bytes, stats->rx_packets,
2928 stats->rx_dropped + stats->rx_missed_errors,
2929 stats->rx_fifo_errors,
2930 stats->rx_length_errors + stats->rx_over_errors +
2931 stats->rx_crc_errors + stats->rx_frame_errors,
2932 stats->rx_compressed, stats->multicast,
2933 stats->tx_bytes, stats->tx_packets,
2934 stats->tx_errors, stats->tx_dropped,
2935 stats->tx_fifo_errors, stats->collisions,
2936 stats->tx_carrier_errors +
2937 stats->tx_aborted_errors +
2938 stats->tx_window_errors +
2939 stats->tx_heartbeat_errors,
2940 stats->tx_compressed);
2944 * Called from the PROCfs module. This now uses the new arbitrary sized
2945 * /proc/net interface to create /proc/net/dev
2947 static int dev_seq_show(struct seq_file *seq, void *v)
2949 if (v == SEQ_START_TOKEN)
2950 seq_puts(seq, "Inter-| Receive "
2952 " face |bytes packets errs drop fifo frame "
2953 "compressed multicast|bytes packets errs "
2954 "drop fifo colls carrier compressed\n");
2956 dev_seq_printf_stats(seq, v);
2960 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2962 struct netif_rx_stats *rc = NULL;
2964 while (*pos < nr_cpu_ids)
2965 if (cpu_online(*pos)) {
2966 rc = &per_cpu(netdev_rx_stat, *pos);
2973 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2975 return softnet_get_online(pos);
2978 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2981 return softnet_get_online(pos);
2984 static void softnet_seq_stop(struct seq_file *seq, void *v)
2988 static int softnet_seq_show(struct seq_file *seq, void *v)
2990 struct netif_rx_stats *s = v;
2992 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2993 s->total, s->dropped, s->time_squeeze, 0,
2994 0, 0, 0, 0, /* was fastroute */
2999 static const struct seq_operations dev_seq_ops = {
3000 .start = dev_seq_start,
3001 .next = dev_seq_next,
3002 .stop = dev_seq_stop,
3003 .show = dev_seq_show,
3006 static int dev_seq_open(struct inode *inode, struct file *file)
3008 return seq_open_net(inode, file, &dev_seq_ops,
3009 sizeof(struct seq_net_private));
3012 static const struct file_operations dev_seq_fops = {
3013 .owner = THIS_MODULE,
3014 .open = dev_seq_open,
3016 .llseek = seq_lseek,
3017 .release = seq_release_net,
3020 static const struct seq_operations softnet_seq_ops = {
3021 .start = softnet_seq_start,
3022 .next = softnet_seq_next,
3023 .stop = softnet_seq_stop,
3024 .show = softnet_seq_show,
3027 static int softnet_seq_open(struct inode *inode, struct file *file)
3029 return seq_open(file, &softnet_seq_ops);
3032 static const struct file_operations softnet_seq_fops = {
3033 .owner = THIS_MODULE,
3034 .open = softnet_seq_open,
3036 .llseek = seq_lseek,
3037 .release = seq_release,
3040 static void *ptype_get_idx(loff_t pos)
3042 struct packet_type *pt = NULL;
3046 list_for_each_entry_rcu(pt, &ptype_all, list) {
3052 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3053 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3062 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3066 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3069 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3071 struct packet_type *pt;
3072 struct list_head *nxt;
3076 if (v == SEQ_START_TOKEN)
3077 return ptype_get_idx(0);
3080 nxt = pt->list.next;
3081 if (pt->type == htons(ETH_P_ALL)) {
3082 if (nxt != &ptype_all)
3085 nxt = ptype_base[0].next;
3087 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3089 while (nxt == &ptype_base[hash]) {
3090 if (++hash >= PTYPE_HASH_SIZE)
3092 nxt = ptype_base[hash].next;
3095 return list_entry(nxt, struct packet_type, list);
3098 static void ptype_seq_stop(struct seq_file *seq, void *v)
3104 static int ptype_seq_show(struct seq_file *seq, void *v)
3106 struct packet_type *pt = v;
3108 if (v == SEQ_START_TOKEN)
3109 seq_puts(seq, "Type Device Function\n");
3110 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3111 if (pt->type == htons(ETH_P_ALL))
3112 seq_puts(seq, "ALL ");
3114 seq_printf(seq, "%04x", ntohs(pt->type));
3116 seq_printf(seq, " %-8s %pF\n",
3117 pt->dev ? pt->dev->name : "", pt->func);
3123 static const struct seq_operations ptype_seq_ops = {
3124 .start = ptype_seq_start,
3125 .next = ptype_seq_next,
3126 .stop = ptype_seq_stop,
3127 .show = ptype_seq_show,
3130 static int ptype_seq_open(struct inode *inode, struct file *file)
3132 return seq_open_net(inode, file, &ptype_seq_ops,
3133 sizeof(struct seq_net_private));
3136 static const struct file_operations ptype_seq_fops = {
3137 .owner = THIS_MODULE,
3138 .open = ptype_seq_open,
3140 .llseek = seq_lseek,
3141 .release = seq_release_net,
3145 static int __net_init dev_proc_net_init(struct net *net)
3149 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3151 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3153 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3156 if (wext_proc_init(net))
3162 proc_net_remove(net, "ptype");
3164 proc_net_remove(net, "softnet_stat");
3166 proc_net_remove(net, "dev");
3170 static void __net_exit dev_proc_net_exit(struct net *net)
3172 wext_proc_exit(net);
3174 proc_net_remove(net, "ptype");
3175 proc_net_remove(net, "softnet_stat");
3176 proc_net_remove(net, "dev");
3179 static struct pernet_operations __net_initdata dev_proc_ops = {
3180 .init = dev_proc_net_init,
3181 .exit = dev_proc_net_exit,
3184 static int __init dev_proc_init(void)
3186 return register_pernet_subsys(&dev_proc_ops);
3189 #define dev_proc_init() 0
3190 #endif /* CONFIG_PROC_FS */
3194 * netdev_set_master - set up master/slave pair
3195 * @slave: slave device
3196 * @master: new master device
3198 * Changes the master device of the slave. Pass %NULL to break the
3199 * bonding. The caller must hold the RTNL semaphore. On a failure
3200 * a negative errno code is returned. On success the reference counts
3201 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3202 * function returns zero.
3204 int netdev_set_master(struct net_device *slave, struct net_device *master)
3206 struct net_device *old = slave->master;
3216 slave->master = master;
3224 slave->flags |= IFF_SLAVE;
3226 slave->flags &= ~IFF_SLAVE;
3228 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3232 static void dev_change_rx_flags(struct net_device *dev, int flags)
3234 const struct net_device_ops *ops = dev->netdev_ops;
3236 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3237 ops->ndo_change_rx_flags(dev, flags);
3240 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3242 unsigned short old_flags = dev->flags;
3248 dev->flags |= IFF_PROMISC;
3249 dev->promiscuity += inc;
3250 if (dev->promiscuity == 0) {
3253 * If inc causes overflow, untouch promisc and return error.
3256 dev->flags &= ~IFF_PROMISC;
3258 dev->promiscuity -= inc;
3259 printk(KERN_WARNING "%s: promiscuity touches roof, "
3260 "set promiscuity failed, promiscuity feature "
3261 "of device might be broken.\n", dev->name);
3265 if (dev->flags != old_flags) {
3266 printk(KERN_INFO "device %s %s promiscuous mode\n",
3267 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3269 if (audit_enabled) {
3270 current_uid_gid(&uid, &gid);
3271 audit_log(current->audit_context, GFP_ATOMIC,
3272 AUDIT_ANOM_PROMISCUOUS,
3273 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3274 dev->name, (dev->flags & IFF_PROMISC),
3275 (old_flags & IFF_PROMISC),
3276 audit_get_loginuid(current),
3278 audit_get_sessionid(current));
3281 dev_change_rx_flags(dev, IFF_PROMISC);
3287 * dev_set_promiscuity - update promiscuity count on a device
3291 * Add or remove promiscuity from a device. While the count in the device
3292 * remains above zero the interface remains promiscuous. Once it hits zero
3293 * the device reverts back to normal filtering operation. A negative inc
3294 * value is used to drop promiscuity on the device.
3295 * Return 0 if successful or a negative errno code on error.
3297 int dev_set_promiscuity(struct net_device *dev, int inc)
3299 unsigned short old_flags = dev->flags;
3302 err = __dev_set_promiscuity(dev, inc);
3305 if (dev->flags != old_flags)
3306 dev_set_rx_mode(dev);
3311 * dev_set_allmulti - update allmulti count on a device
3315 * Add or remove reception of all multicast frames to a device. While the
3316 * count in the device remains above zero the interface remains listening
3317 * to all interfaces. Once it hits zero the device reverts back to normal
3318 * filtering operation. A negative @inc value is used to drop the counter
3319 * when releasing a resource needing all multicasts.
3320 * Return 0 if successful or a negative errno code on error.
3323 int dev_set_allmulti(struct net_device *dev, int inc)
3325 unsigned short old_flags = dev->flags;
3329 dev->flags |= IFF_ALLMULTI;
3330 dev->allmulti += inc;
3331 if (dev->allmulti == 0) {
3334 * If inc causes overflow, untouch allmulti and return error.
3337 dev->flags &= ~IFF_ALLMULTI;
3339 dev->allmulti -= inc;
3340 printk(KERN_WARNING "%s: allmulti touches roof, "
3341 "set allmulti failed, allmulti feature of "
3342 "device might be broken.\n", dev->name);
3346 if (dev->flags ^ old_flags) {
3347 dev_change_rx_flags(dev, IFF_ALLMULTI);
3348 dev_set_rx_mode(dev);
3354 * Upload unicast and multicast address lists to device and
3355 * configure RX filtering. When the device doesn't support unicast
3356 * filtering it is put in promiscuous mode while unicast addresses
3359 void __dev_set_rx_mode(struct net_device *dev)
3361 const struct net_device_ops *ops = dev->netdev_ops;
3363 /* dev_open will call this function so the list will stay sane. */
3364 if (!(dev->flags&IFF_UP))
3367 if (!netif_device_present(dev))
3370 if (ops->ndo_set_rx_mode)
3371 ops->ndo_set_rx_mode(dev);
3373 /* Unicast addresses changes may only happen under the rtnl,
3374 * therefore calling __dev_set_promiscuity here is safe.
3376 if (dev->uc_count > 0 && !dev->uc_promisc) {
3377 __dev_set_promiscuity(dev, 1);
3378 dev->uc_promisc = 1;
3379 } else if (dev->uc_count == 0 && dev->uc_promisc) {
3380 __dev_set_promiscuity(dev, -1);
3381 dev->uc_promisc = 0;
3384 if (ops->ndo_set_multicast_list)
3385 ops->ndo_set_multicast_list(dev);
3389 void dev_set_rx_mode(struct net_device *dev)
3391 netif_addr_lock_bh(dev);
3392 __dev_set_rx_mode(dev);
3393 netif_addr_unlock_bh(dev);
3396 int __dev_addr_delete(struct dev_addr_list **list, int *count,
3397 void *addr, int alen, int glbl)
3399 struct dev_addr_list *da;
3401 for (; (da = *list) != NULL; list = &da->next) {
3402 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3403 alen == da->da_addrlen) {
3405 int old_glbl = da->da_gusers;
3422 int __dev_addr_add(struct dev_addr_list **list, int *count,
3423 void *addr, int alen, int glbl)
3425 struct dev_addr_list *da;
3427 for (da = *list; da != NULL; da = da->next) {
3428 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3429 da->da_addrlen == alen) {
3431 int old_glbl = da->da_gusers;
3441 da = kzalloc(sizeof(*da), GFP_ATOMIC);
3444 memcpy(da->da_addr, addr, alen);
3445 da->da_addrlen = alen;
3447 da->da_gusers = glbl ? 1 : 0;
3455 * dev_unicast_delete - Release secondary unicast address.
3457 * @addr: address to delete
3458 * @alen: length of @addr
3460 * Release reference to a secondary unicast address and remove it
3461 * from the device if the reference count drops to zero.
3463 * The caller must hold the rtnl_mutex.
3465 int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
3471 netif_addr_lock_bh(dev);
3472 err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3474 __dev_set_rx_mode(dev);
3475 netif_addr_unlock_bh(dev);
3478 EXPORT_SYMBOL(dev_unicast_delete);
3481 * dev_unicast_add - add a secondary unicast address
3483 * @addr: address to add
3484 * @alen: length of @addr
3486 * Add a secondary unicast address to the device or increase
3487 * the reference count if it already exists.
3489 * The caller must hold the rtnl_mutex.
3491 int dev_unicast_add(struct net_device *dev, void *addr, int alen)
3497 netif_addr_lock_bh(dev);
3498 err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3500 __dev_set_rx_mode(dev);
3501 netif_addr_unlock_bh(dev);
3504 EXPORT_SYMBOL(dev_unicast_add);
3506 int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
3507 struct dev_addr_list **from, int *from_count)
3509 struct dev_addr_list *da, *next;
3513 while (da != NULL) {
3515 if (!da->da_synced) {
3516 err = __dev_addr_add(to, to_count,
3517 da->da_addr, da->da_addrlen, 0);
3522 } else if (da->da_users == 1) {
3523 __dev_addr_delete(to, to_count,
3524 da->da_addr, da->da_addrlen, 0);
3525 __dev_addr_delete(from, from_count,
3526 da->da_addr, da->da_addrlen, 0);
3533 void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
3534 struct dev_addr_list **from, int *from_count)
3536 struct dev_addr_list *da, *next;
3539 while (da != NULL) {
3541 if (da->da_synced) {
3542 __dev_addr_delete(to, to_count,
3543 da->da_addr, da->da_addrlen, 0);
3545 __dev_addr_delete(from, from_count,
3546 da->da_addr, da->da_addrlen, 0);
3553 * dev_unicast_sync - Synchronize device's unicast list to another device
3554 * @to: destination device
3555 * @from: source device
3557 * Add newly added addresses to the destination device and release
3558 * addresses that have no users left. The source device must be
3559 * locked by netif_tx_lock_bh.
3561 * This function is intended to be called from the dev->set_rx_mode
3562 * function of layered software devices.
3564 int dev_unicast_sync(struct net_device *to, struct net_device *from)
3568 netif_addr_lock_bh(to);
3569 err = __dev_addr_sync(&to->uc_list, &to->uc_count,
3570 &from->uc_list, &from->uc_count);
3572 __dev_set_rx_mode(to);
3573 netif_addr_unlock_bh(to);
3576 EXPORT_SYMBOL(dev_unicast_sync);
3579 * dev_unicast_unsync - Remove synchronized addresses from the destination device
3580 * @to: destination device
3581 * @from: source device
3583 * Remove all addresses that were added to the destination device by
3584 * dev_unicast_sync(). This function is intended to be called from the
3585 * dev->stop function of layered software devices.
3587 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
3589 netif_addr_lock_bh(from);
3590 netif_addr_lock(to);
3592 __dev_addr_unsync(&to->uc_list, &to->uc_count,
3593 &from->uc_list, &from->uc_count);
3594 __dev_set_rx_mode(to);
3596 netif_addr_unlock(to);
3597 netif_addr_unlock_bh(from);
3599 EXPORT_SYMBOL(dev_unicast_unsync);
3601 static void __dev_addr_discard(struct dev_addr_list **list)
3603 struct dev_addr_list *tmp;
3605 while (*list != NULL) {
3608 if (tmp->da_users > tmp->da_gusers)
3609 printk("__dev_addr_discard: address leakage! "
3610 "da_users=%d\n", tmp->da_users);
3615 static void dev_addr_discard(struct net_device *dev)
3617 netif_addr_lock_bh(dev);
3619 __dev_addr_discard(&dev->uc_list);
3622 __dev_addr_discard(&dev->mc_list);
3625 netif_addr_unlock_bh(dev);
3629 * dev_get_flags - get flags reported to userspace
3632 * Get the combination of flag bits exported through APIs to userspace.
3634 unsigned dev_get_flags(const struct net_device *dev)
3638 flags = (dev->flags & ~(IFF_PROMISC |
3643 (dev->gflags & (IFF_PROMISC |
3646 if (netif_running(dev)) {
3647 if (netif_oper_up(dev))
3648 flags |= IFF_RUNNING;
3649 if (netif_carrier_ok(dev))
3650 flags |= IFF_LOWER_UP;
3651 if (netif_dormant(dev))
3652 flags |= IFF_DORMANT;
3659 * dev_change_flags - change device settings
3661 * @flags: device state flags
3663 * Change settings on device based state flags. The flags are
3664 * in the userspace exported format.
3666 int dev_change_flags(struct net_device *dev, unsigned flags)
3669 int old_flags = dev->flags;
3674 * Set the flags on our device.
3677 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
3678 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
3680 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
3684 * Load in the correct multicast list now the flags have changed.
3687 if ((old_flags ^ flags) & IFF_MULTICAST)
3688 dev_change_rx_flags(dev, IFF_MULTICAST);
3690 dev_set_rx_mode(dev);
3693 * Have we downed the interface. We handle IFF_UP ourselves
3694 * according to user attempts to set it, rather than blindly
3699 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
3700 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
3703 dev_set_rx_mode(dev);
3706 if (dev->flags & IFF_UP &&
3707 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
3709 call_netdevice_notifiers(NETDEV_CHANGE, dev);
3711 if ((flags ^ dev->gflags) & IFF_PROMISC) {
3712 int inc = (flags & IFF_PROMISC) ? +1 : -1;
3713 dev->gflags ^= IFF_PROMISC;
3714 dev_set_promiscuity(dev, inc);
3717 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
3718 is important. Some (broken) drivers set IFF_PROMISC, when
3719 IFF_ALLMULTI is requested not asking us and not reporting.
3721 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
3722 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
3723 dev->gflags ^= IFF_ALLMULTI;
3724 dev_set_allmulti(dev, inc);
3727 /* Exclude state transition flags, already notified */
3728 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
3730 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
3736 * dev_set_mtu - Change maximum transfer unit
3738 * @new_mtu: new transfer unit
3740 * Change the maximum transfer size of the network device.
3742 int dev_set_mtu(struct net_device *dev, int new_mtu)
3744 const struct net_device_ops *ops = dev->netdev_ops;
3747 if (new_mtu == dev->mtu)
3750 /* MTU must be positive. */
3754 if (!netif_device_present(dev))
3758 if (ops->ndo_change_mtu)
3759 err = ops->ndo_change_mtu(dev, new_mtu);
3763 if (!err && dev->flags & IFF_UP)
3764 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
3769 * dev_set_mac_address - Change Media Access Control Address
3773 * Change the hardware (MAC) address of the device
3775 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
3777 const struct net_device_ops *ops = dev->netdev_ops;
3780 if (!ops->ndo_set_mac_address)
3782 if (sa->sa_family != dev->type)
3784 if (!netif_device_present(dev))
3786 err = ops->ndo_set_mac_address(dev, sa);
3788 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3793 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
3795 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
3798 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3804 case SIOCGIFFLAGS: /* Get interface flags */
3805 ifr->ifr_flags = dev_get_flags(dev);
3808 case SIOCGIFMETRIC: /* Get the metric on the interface
3809 (currently unused) */
3810 ifr->ifr_metric = 0;
3813 case SIOCGIFMTU: /* Get the MTU of a device */
3814 ifr->ifr_mtu = dev->mtu;
3819 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
3821 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
3822 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3823 ifr->ifr_hwaddr.sa_family = dev->type;
3831 ifr->ifr_map.mem_start = dev->mem_start;
3832 ifr->ifr_map.mem_end = dev->mem_end;
3833 ifr->ifr_map.base_addr = dev->base_addr;
3834 ifr->ifr_map.irq = dev->irq;
3835 ifr->ifr_map.dma = dev->dma;
3836 ifr->ifr_map.port = dev->if_port;
3840 ifr->ifr_ifindex = dev->ifindex;
3844 ifr->ifr_qlen = dev->tx_queue_len;
3848 /* dev_ioctl() should ensure this case
3860 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
3862 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
3865 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3866 const struct net_device_ops *ops;
3871 ops = dev->netdev_ops;
3874 case SIOCSIFFLAGS: /* Set interface flags */
3875 return dev_change_flags(dev, ifr->ifr_flags);
3877 case SIOCSIFMETRIC: /* Set the metric on the interface
3878 (currently unused) */
3881 case SIOCSIFMTU: /* Set the MTU of a device */
3882 return dev_set_mtu(dev, ifr->ifr_mtu);
3885 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
3887 case SIOCSIFHWBROADCAST:
3888 if (ifr->ifr_hwaddr.sa_family != dev->type)
3890 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
3891 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3892 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3896 if (ops->ndo_set_config) {
3897 if (!netif_device_present(dev))
3899 return ops->ndo_set_config(dev, &ifr->ifr_map);
3904 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
3905 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3907 if (!netif_device_present(dev))
3909 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
3913 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
3914 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3916 if (!netif_device_present(dev))
3918 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
3922 if (ifr->ifr_qlen < 0)
3924 dev->tx_queue_len = ifr->ifr_qlen;
3928 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
3929 return dev_change_name(dev, ifr->ifr_newname);
3932 * Unknown or private ioctl
3936 if ((cmd >= SIOCDEVPRIVATE &&
3937 cmd <= SIOCDEVPRIVATE + 15) ||
3938 cmd == SIOCBONDENSLAVE ||
3939 cmd == SIOCBONDRELEASE ||
3940 cmd == SIOCBONDSETHWADDR ||
3941 cmd == SIOCBONDSLAVEINFOQUERY ||
3942 cmd == SIOCBONDINFOQUERY ||
3943 cmd == SIOCBONDCHANGEACTIVE ||
3944 cmd == SIOCGMIIPHY ||
3945 cmd == SIOCGMIIREG ||
3946 cmd == SIOCSMIIREG ||
3947 cmd == SIOCBRADDIF ||
3948 cmd == SIOCBRDELIF ||
3949 cmd == SIOCWANDEV) {
3951 if (ops->ndo_do_ioctl) {
3952 if (netif_device_present(dev))
3953 err = ops->ndo_do_ioctl(dev, ifr, cmd);
3965 * This function handles all "interface"-type I/O control requests. The actual
3966 * 'doing' part of this is dev_ifsioc above.
3970 * dev_ioctl - network device ioctl
3971 * @net: the applicable net namespace
3972 * @cmd: command to issue
3973 * @arg: pointer to a struct ifreq in user space
3975 * Issue ioctl functions to devices. This is normally called by the
3976 * user space syscall interfaces but can sometimes be useful for
3977 * other purposes. The return value is the return from the syscall if
3978 * positive or a negative errno code on error.
3981 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
3987 /* One special case: SIOCGIFCONF takes ifconf argument
3988 and requires shared lock, because it sleeps writing
3992 if (cmd == SIOCGIFCONF) {
3994 ret = dev_ifconf(net, (char __user *) arg);
3998 if (cmd == SIOCGIFNAME)
3999 return dev_ifname(net, (struct ifreq __user *)arg);
4001 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4004 ifr.ifr_name[IFNAMSIZ-1] = 0;
4006 colon = strchr(ifr.ifr_name, ':');
4011 * See which interface the caller is talking about.
4016 * These ioctl calls:
4017 * - can be done by all.
4018 * - atomic and do not require locking.
4029 dev_load(net, ifr.ifr_name);
4030 read_lock(&dev_base_lock);
4031 ret = dev_ifsioc_locked(net, &ifr, cmd);
4032 read_unlock(&dev_base_lock);
4036 if (copy_to_user(arg, &ifr,
4037 sizeof(struct ifreq)))
4043 dev_load(net, ifr.ifr_name);
4045 ret = dev_ethtool(net, &ifr);
4050 if (copy_to_user(arg, &ifr,
4051 sizeof(struct ifreq)))
4057 * These ioctl calls:
4058 * - require superuser power.
4059 * - require strict serialization.
4065 if (!capable(CAP_NET_ADMIN))
4067 dev_load(net, ifr.ifr_name);
4069 ret = dev_ifsioc(net, &ifr, cmd);
4074 if (copy_to_user(arg, &ifr,
4075 sizeof(struct ifreq)))
4081 * These ioctl calls:
4082 * - require superuser power.
4083 * - require strict serialization.
4084 * - do not return a value
4094 case SIOCSIFHWBROADCAST:
4097 case SIOCBONDENSLAVE:
4098 case SIOCBONDRELEASE:
4099 case SIOCBONDSETHWADDR:
4100 case SIOCBONDCHANGEACTIVE:
4103 if (!capable(CAP_NET_ADMIN))
4106 case SIOCBONDSLAVEINFOQUERY:
4107 case SIOCBONDINFOQUERY:
4108 dev_load(net, ifr.ifr_name);
4110 ret = dev_ifsioc(net, &ifr, cmd);
4115 /* Get the per device memory space. We can add this but
4116 * currently do not support it */
4118 /* Set the per device memory buffer space.
4119 * Not applicable in our case */
4124 * Unknown or private ioctl.
4127 if (cmd == SIOCWANDEV ||
4128 (cmd >= SIOCDEVPRIVATE &&
4129 cmd <= SIOCDEVPRIVATE + 15)) {
4130 dev_load(net, ifr.ifr_name);
4132 ret = dev_ifsioc(net, &ifr, cmd);
4134 if (!ret && copy_to_user(arg, &ifr,
4135 sizeof(struct ifreq)))
4139 /* Take care of Wireless Extensions */
4140 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4141 return wext_handle_ioctl(net, &ifr, cmd, arg);
4148 * dev_new_index - allocate an ifindex
4149 * @net: the applicable net namespace
4151 * Returns a suitable unique value for a new device interface
4152 * number. The caller must hold the rtnl semaphore or the
4153 * dev_base_lock to be sure it remains unique.
4155 static int dev_new_index(struct net *net)
4161 if (!__dev_get_by_index(net, ifindex))
4166 /* Delayed registration/unregisteration */
4167 static LIST_HEAD(net_todo_list);
4169 static void net_set_todo(struct net_device *dev)
4171 list_add_tail(&dev->todo_list, &net_todo_list);
4174 static void rollback_registered(struct net_device *dev)
4176 BUG_ON(dev_boot_phase);
4179 /* Some devices call without registering for initialization unwind. */
4180 if (dev->reg_state == NETREG_UNINITIALIZED) {
4181 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
4182 "was registered\n", dev->name, dev);
4188 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4190 /* If device is running, close it first. */
4193 /* And unlink it from device chain. */
4194 unlist_netdevice(dev);
4196 dev->reg_state = NETREG_UNREGISTERING;
4200 /* Shutdown queueing discipline. */
4204 /* Notify protocols, that we are about to destroy
4205 this device. They should clean all the things.
4207 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4210 * Flush the unicast and multicast chains
4212 dev_addr_discard(dev);
4214 if (dev->netdev_ops->ndo_uninit)
4215 dev->netdev_ops->ndo_uninit(dev);
4217 /* Notifier chain MUST detach us from master device. */
4218 WARN_ON(dev->master);
4220 /* Remove entries from kobject tree */
4221 netdev_unregister_kobject(dev);
4228 static void __netdev_init_queue_locks_one(struct net_device *dev,
4229 struct netdev_queue *dev_queue,
4232 spin_lock_init(&dev_queue->_xmit_lock);
4233 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4234 dev_queue->xmit_lock_owner = -1;
4237 static void netdev_init_queue_locks(struct net_device *dev)
4239 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4240 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4243 unsigned long netdev_fix_features(unsigned long features, const char *name)
4245 /* Fix illegal SG+CSUM combinations. */
4246 if ((features & NETIF_F_SG) &&
4247 !(features & NETIF_F_ALL_CSUM)) {
4249 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4250 "checksum feature.\n", name);
4251 features &= ~NETIF_F_SG;
4254 /* TSO requires that SG is present as well. */
4255 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4257 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4258 "SG feature.\n", name);
4259 features &= ~NETIF_F_TSO;
4262 if (features & NETIF_F_UFO) {
4263 if (!(features & NETIF_F_GEN_CSUM)) {
4265 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4266 "since no NETIF_F_HW_CSUM feature.\n",
4268 features &= ~NETIF_F_UFO;
4271 if (!(features & NETIF_F_SG)) {
4273 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4274 "since no NETIF_F_SG feature.\n", name);
4275 features &= ~NETIF_F_UFO;
4281 EXPORT_SYMBOL(netdev_fix_features);
4284 * register_netdevice - register a network device
4285 * @dev: device to register
4287 * Take a completed network device structure and add it to the kernel
4288 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4289 * chain. 0 is returned on success. A negative errno code is returned
4290 * on a failure to set up the device, or if the name is a duplicate.
4292 * Callers must hold the rtnl semaphore. You may want
4293 * register_netdev() instead of this.
4296 * The locking appears insufficient to guarantee two parallel registers
4297 * will not get the same name.
4300 int register_netdevice(struct net_device *dev)
4302 struct hlist_head *head;
4303 struct hlist_node *p;
4305 struct net *net = dev_net(dev);
4307 BUG_ON(dev_boot_phase);
4312 /* When net_device's are persistent, this will be fatal. */
4313 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4316 spin_lock_init(&dev->addr_list_lock);
4317 netdev_set_addr_lockdep_class(dev);
4318 netdev_init_queue_locks(dev);
4322 #ifdef CONFIG_COMPAT_NET_DEV_OPS
4323 /* Netdevice_ops API compatiability support.
4324 * This is temporary until all network devices are converted.
4326 if (dev->netdev_ops) {
4327 const struct net_device_ops *ops = dev->netdev_ops;
4329 dev->init = ops->ndo_init;
4330 dev->uninit = ops->ndo_uninit;
4331 dev->open = ops->ndo_open;
4332 dev->change_rx_flags = ops->ndo_change_rx_flags;
4333 dev->set_rx_mode = ops->ndo_set_rx_mode;
4334 dev->set_multicast_list = ops->ndo_set_multicast_list;
4335 dev->set_mac_address = ops->ndo_set_mac_address;
4336 dev->validate_addr = ops->ndo_validate_addr;
4337 dev->do_ioctl = ops->ndo_do_ioctl;
4338 dev->set_config = ops->ndo_set_config;
4339 dev->change_mtu = ops->ndo_change_mtu;
4340 dev->tx_timeout = ops->ndo_tx_timeout;
4341 dev->get_stats = ops->ndo_get_stats;
4342 dev->vlan_rx_register = ops->ndo_vlan_rx_register;
4343 dev->vlan_rx_add_vid = ops->ndo_vlan_rx_add_vid;
4344 dev->vlan_rx_kill_vid = ops->ndo_vlan_rx_kill_vid;
4345 #ifdef CONFIG_NET_POLL_CONTROLLER
4346 dev->poll_controller = ops->ndo_poll_controller;
4349 char drivername[64];
4350 pr_info("%s (%s): not using net_device_ops yet\n",
4351 dev->name, netdev_drivername(dev, drivername, 64));
4353 /* This works only because net_device_ops and the
4354 compatiablity structure are the same. */
4355 dev->netdev_ops = (void *) &(dev->init);
4359 /* Init, if this function is available */
4360 if (dev->netdev_ops->ndo_init) {
4361 ret = dev->netdev_ops->ndo_init(dev);
4369 if (!dev_valid_name(dev->name)) {
4374 dev->ifindex = dev_new_index(net);
4375 if (dev->iflink == -1)
4376 dev->iflink = dev->ifindex;
4378 /* Check for existence of name */
4379 head = dev_name_hash(net, dev->name);
4380 hlist_for_each(p, head) {
4381 struct net_device *d
4382 = hlist_entry(p, struct net_device, name_hlist);
4383 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
4389 /* Fix illegal checksum combinations */
4390 if ((dev->features & NETIF_F_HW_CSUM) &&
4391 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4392 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4394 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4397 if ((dev->features & NETIF_F_NO_CSUM) &&
4398 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4399 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4401 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4404 dev->features = netdev_fix_features(dev->features, dev->name);
4406 /* Enable software GSO if SG is supported. */
4407 if (dev->features & NETIF_F_SG)
4408 dev->features |= NETIF_F_GSO;
4410 netdev_initialize_kobject(dev);
4411 ret = netdev_register_kobject(dev);
4414 dev->reg_state = NETREG_REGISTERED;
4417 * Default initial state at registry is that the
4418 * device is present.
4421 set_bit(__LINK_STATE_PRESENT, &dev->state);
4423 dev_init_scheduler(dev);
4425 list_netdevice(dev);
4427 /* Notify protocols, that a new device appeared. */
4428 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4429 ret = notifier_to_errno(ret);
4431 rollback_registered(dev);
4432 dev->reg_state = NETREG_UNREGISTERED;
4439 if (dev->netdev_ops->ndo_uninit)
4440 dev->netdev_ops->ndo_uninit(dev);
4445 * init_dummy_netdev - init a dummy network device for NAPI
4446 * @dev: device to init
4448 * This takes a network device structure and initialize the minimum
4449 * amount of fields so it can be used to schedule NAPI polls without
4450 * registering a full blown interface. This is to be used by drivers
4451 * that need to tie several hardware interfaces to a single NAPI
4452 * poll scheduler due to HW limitations.
4454 int init_dummy_netdev(struct net_device *dev)
4456 /* Clear everything. Note we don't initialize spinlocks
4457 * are they aren't supposed to be taken by any of the
4458 * NAPI code and this dummy netdev is supposed to be
4459 * only ever used for NAPI polls
4461 memset(dev, 0, sizeof(struct net_device));
4463 /* make sure we BUG if trying to hit standard
4464 * register/unregister code path
4466 dev->reg_state = NETREG_DUMMY;
4468 /* initialize the ref count */
4469 atomic_set(&dev->refcnt, 1);
4471 /* NAPI wants this */
4472 INIT_LIST_HEAD(&dev->napi_list);
4474 /* a dummy interface is started by default */
4475 set_bit(__LINK_STATE_PRESENT, &dev->state);
4476 set_bit(__LINK_STATE_START, &dev->state);
4480 EXPORT_SYMBOL_GPL(init_dummy_netdev);
4484 * register_netdev - register a network device
4485 * @dev: device to register
4487 * Take a completed network device structure and add it to the kernel
4488 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4489 * chain. 0 is returned on success. A negative errno code is returned
4490 * on a failure to set up the device, or if the name is a duplicate.
4492 * This is a wrapper around register_netdevice that takes the rtnl semaphore
4493 * and expands the device name if you passed a format string to
4496 int register_netdev(struct net_device *dev)
4503 * If the name is a format string the caller wants us to do a
4506 if (strchr(dev->name, '%')) {
4507 err = dev_alloc_name(dev, dev->name);
4512 err = register_netdevice(dev);
4517 EXPORT_SYMBOL(register_netdev);
4520 * netdev_wait_allrefs - wait until all references are gone.
4522 * This is called when unregistering network devices.
4524 * Any protocol or device that holds a reference should register
4525 * for netdevice notification, and cleanup and put back the
4526 * reference if they receive an UNREGISTER event.
4527 * We can get stuck here if buggy protocols don't correctly
4530 static void netdev_wait_allrefs(struct net_device *dev)
4532 unsigned long rebroadcast_time, warning_time;
4534 rebroadcast_time = warning_time = jiffies;
4535 while (atomic_read(&dev->refcnt) != 0) {
4536 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
4539 /* Rebroadcast unregister notification */
4540 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4542 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
4544 /* We must not have linkwatch events
4545 * pending on unregister. If this
4546 * happens, we simply run the queue
4547 * unscheduled, resulting in a noop
4550 linkwatch_run_queue();
4555 rebroadcast_time = jiffies;
4560 if (time_after(jiffies, warning_time + 10 * HZ)) {
4561 printk(KERN_EMERG "unregister_netdevice: "
4562 "waiting for %s to become free. Usage "
4564 dev->name, atomic_read(&dev->refcnt));
4565 warning_time = jiffies;
4574 * register_netdevice(x1);
4575 * register_netdevice(x2);
4577 * unregister_netdevice(y1);
4578 * unregister_netdevice(y2);
4584 * We are invoked by rtnl_unlock().
4585 * This allows us to deal with problems:
4586 * 1) We can delete sysfs objects which invoke hotplug
4587 * without deadlocking with linkwatch via keventd.
4588 * 2) Since we run with the RTNL semaphore not held, we can sleep
4589 * safely in order to wait for the netdev refcnt to drop to zero.
4591 * We must not return until all unregister events added during
4592 * the interval the lock was held have been completed.
4594 void netdev_run_todo(void)
4596 struct list_head list;
4598 /* Snapshot list, allow later requests */
4599 list_replace_init(&net_todo_list, &list);
4603 while (!list_empty(&list)) {
4604 struct net_device *dev
4605 = list_entry(list.next, struct net_device, todo_list);
4606 list_del(&dev->todo_list);
4608 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
4609 printk(KERN_ERR "network todo '%s' but state %d\n",
4610 dev->name, dev->reg_state);
4615 dev->reg_state = NETREG_UNREGISTERED;
4617 on_each_cpu(flush_backlog, dev, 1);
4619 netdev_wait_allrefs(dev);
4622 BUG_ON(atomic_read(&dev->refcnt));
4623 WARN_ON(dev->ip_ptr);
4624 WARN_ON(dev->ip6_ptr);
4625 WARN_ON(dev->dn_ptr);
4627 if (dev->destructor)
4628 dev->destructor(dev);
4630 /* Free network device */
4631 kobject_put(&dev->dev.kobj);
4636 * dev_get_stats - get network device statistics
4637 * @dev: device to get statistics from
4639 * Get network statistics from device. The device driver may provide
4640 * its own method by setting dev->netdev_ops->get_stats; otherwise
4641 * the internal statistics structure is used.
4643 const struct net_device_stats *dev_get_stats(struct net_device *dev)
4645 const struct net_device_ops *ops = dev->netdev_ops;
4647 if (ops->ndo_get_stats)
4648 return ops->ndo_get_stats(dev);
4652 EXPORT_SYMBOL(dev_get_stats);
4654 static void netdev_init_one_queue(struct net_device *dev,
4655 struct netdev_queue *queue,
4661 static void netdev_init_queues(struct net_device *dev)
4663 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
4664 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
4665 spin_lock_init(&dev->tx_global_lock);
4669 * alloc_netdev_mq - allocate network device
4670 * @sizeof_priv: size of private data to allocate space for
4671 * @name: device name format string
4672 * @setup: callback to initialize device
4673 * @queue_count: the number of subqueues to allocate
4675 * Allocates a struct net_device with private data area for driver use
4676 * and performs basic initialization. Also allocates subquue structs
4677 * for each queue on the device at the end of the netdevice.
4679 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
4680 void (*setup)(struct net_device *), unsigned int queue_count)
4682 struct netdev_queue *tx;
4683 struct net_device *dev;
4687 BUG_ON(strlen(name) >= sizeof(dev->name));
4689 alloc_size = sizeof(struct net_device);
4691 /* ensure 32-byte alignment of private area */
4692 alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
4693 alloc_size += sizeof_priv;
4695 /* ensure 32-byte alignment of whole construct */
4696 alloc_size += NETDEV_ALIGN_CONST;
4698 p = kzalloc(alloc_size, GFP_KERNEL);
4700 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
4704 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
4706 printk(KERN_ERR "alloc_netdev: Unable to allocate "
4712 dev = (struct net_device *)
4713 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4714 dev->padded = (char *)dev - (char *)p;
4715 dev_net_set(dev, &init_net);
4718 dev->num_tx_queues = queue_count;
4719 dev->real_num_tx_queues = queue_count;
4721 dev->gso_max_size = GSO_MAX_SIZE;
4723 netdev_init_queues(dev);
4725 INIT_LIST_HEAD(&dev->napi_list);
4727 strcpy(dev->name, name);
4730 EXPORT_SYMBOL(alloc_netdev_mq);
4733 * free_netdev - free network device
4736 * This function does the last stage of destroying an allocated device
4737 * interface. The reference to the device object is released.
4738 * If this is the last reference then it will be freed.
4740 void free_netdev(struct net_device *dev)
4742 struct napi_struct *p, *n;
4744 release_net(dev_net(dev));
4748 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
4751 /* Compatibility with error handling in drivers */
4752 if (dev->reg_state == NETREG_UNINITIALIZED) {
4753 kfree((char *)dev - dev->padded);
4757 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
4758 dev->reg_state = NETREG_RELEASED;
4760 /* will free via device release */
4761 put_device(&dev->dev);
4765 * synchronize_net - Synchronize with packet receive processing
4767 * Wait for packets currently being received to be done.
4768 * Does not block later packets from starting.
4770 void synchronize_net(void)
4777 * unregister_netdevice - remove device from the kernel
4780 * This function shuts down a device interface and removes it
4781 * from the kernel tables.
4783 * Callers must hold the rtnl semaphore. You may want
4784 * unregister_netdev() instead of this.
4787 void unregister_netdevice(struct net_device *dev)
4791 rollback_registered(dev);
4792 /* Finish processing unregister after unlock */
4797 * unregister_netdev - remove device from the kernel
4800 * This function shuts down a device interface and removes it
4801 * from the kernel tables.
4803 * This is just a wrapper for unregister_netdevice that takes
4804 * the rtnl semaphore. In general you want to use this and not
4805 * unregister_netdevice.
4807 void unregister_netdev(struct net_device *dev)
4810 unregister_netdevice(dev);
4814 EXPORT_SYMBOL(unregister_netdev);
4817 * dev_change_net_namespace - move device to different nethost namespace
4819 * @net: network namespace
4820 * @pat: If not NULL name pattern to try if the current device name
4821 * is already taken in the destination network namespace.
4823 * This function shuts down a device interface and moves it
4824 * to a new network namespace. On success 0 is returned, on
4825 * a failure a netagive errno code is returned.
4827 * Callers must hold the rtnl semaphore.
4830 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
4833 const char *destname;
4838 /* Don't allow namespace local devices to be moved. */
4840 if (dev->features & NETIF_F_NETNS_LOCAL)
4844 /* Don't allow real devices to be moved when sysfs
4848 if (dev->dev.parent)
4852 /* Ensure the device has been registrered */
4854 if (dev->reg_state != NETREG_REGISTERED)
4857 /* Get out if there is nothing todo */
4859 if (net_eq(dev_net(dev), net))
4862 /* Pick the destination device name, and ensure
4863 * we can use it in the destination network namespace.
4866 destname = dev->name;
4867 if (__dev_get_by_name(net, destname)) {
4868 /* We get here if we can't use the current device name */
4871 if (!dev_valid_name(pat))
4873 if (strchr(pat, '%')) {
4874 if (__dev_alloc_name(net, pat, buf) < 0)
4879 if (__dev_get_by_name(net, destname))
4884 * And now a mini version of register_netdevice unregister_netdevice.
4887 /* If device is running close it first. */
4890 /* And unlink it from device chain */
4892 unlist_netdevice(dev);
4896 /* Shutdown queueing discipline. */
4899 /* Notify protocols, that we are about to destroy
4900 this device. They should clean all the things.
4902 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4905 * Flush the unicast and multicast chains
4907 dev_addr_discard(dev);
4909 netdev_unregister_kobject(dev);
4911 /* Actually switch the network namespace */
4912 dev_net_set(dev, net);
4914 /* Assign the new device name */
4915 if (destname != dev->name)
4916 strcpy(dev->name, destname);
4918 /* If there is an ifindex conflict assign a new one */
4919 if (__dev_get_by_index(net, dev->ifindex)) {
4920 int iflink = (dev->iflink == dev->ifindex);
4921 dev->ifindex = dev_new_index(net);
4923 dev->iflink = dev->ifindex;
4926 /* Fixup kobjects */
4927 err = netdev_register_kobject(dev);
4930 /* Add the device back in the hashes */
4931 list_netdevice(dev);
4933 /* Notify protocols, that a new device appeared. */
4934 call_netdevice_notifiers(NETDEV_REGISTER, dev);
4942 static int dev_cpu_callback(struct notifier_block *nfb,
4943 unsigned long action,
4946 struct sk_buff **list_skb;
4947 struct Qdisc **list_net;
4948 struct sk_buff *skb;
4949 unsigned int cpu, oldcpu = (unsigned long)ocpu;
4950 struct softnet_data *sd, *oldsd;
4952 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
4955 local_irq_disable();
4956 cpu = smp_processor_id();
4957 sd = &per_cpu(softnet_data, cpu);
4958 oldsd = &per_cpu(softnet_data, oldcpu);
4960 /* Find end of our completion_queue. */
4961 list_skb = &sd->completion_queue;
4963 list_skb = &(*list_skb)->next;
4964 /* Append completion queue from offline CPU. */
4965 *list_skb = oldsd->completion_queue;
4966 oldsd->completion_queue = NULL;
4968 /* Find end of our output_queue. */
4969 list_net = &sd->output_queue;
4971 list_net = &(*list_net)->next_sched;
4972 /* Append output queue from offline CPU. */
4973 *list_net = oldsd->output_queue;
4974 oldsd->output_queue = NULL;
4976 raise_softirq_irqoff(NET_TX_SOFTIRQ);
4979 /* Process offline CPU's input_pkt_queue */
4980 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
4988 * netdev_increment_features - increment feature set by one
4989 * @all: current feature set
4990 * @one: new feature set
4991 * @mask: mask feature set
4993 * Computes a new feature set after adding a device with feature set
4994 * @one to the master device with current feature set @all. Will not
4995 * enable anything that is off in @mask. Returns the new feature set.
4997 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5000 /* If device needs checksumming, downgrade to it. */
5001 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5002 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5003 else if (mask & NETIF_F_ALL_CSUM) {
5004 /* If one device supports v4/v6 checksumming, set for all. */
5005 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5006 !(all & NETIF_F_GEN_CSUM)) {
5007 all &= ~NETIF_F_ALL_CSUM;
5008 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5011 /* If one device supports hw checksumming, set for all. */
5012 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5013 all &= ~NETIF_F_ALL_CSUM;
5014 all |= NETIF_F_HW_CSUM;
5018 one |= NETIF_F_ALL_CSUM;
5020 one |= all & NETIF_F_ONE_FOR_ALL;
5021 all &= one | NETIF_F_LLTX | NETIF_F_GSO;
5022 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5026 EXPORT_SYMBOL(netdev_increment_features);
5028 static struct hlist_head *netdev_create_hash(void)
5031 struct hlist_head *hash;
5033 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5035 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5036 INIT_HLIST_HEAD(&hash[i]);
5041 /* Initialize per network namespace state */
5042 static int __net_init netdev_init(struct net *net)
5044 INIT_LIST_HEAD(&net->dev_base_head);
5046 net->dev_name_head = netdev_create_hash();
5047 if (net->dev_name_head == NULL)
5050 net->dev_index_head = netdev_create_hash();
5051 if (net->dev_index_head == NULL)
5057 kfree(net->dev_name_head);
5063 * netdev_drivername - network driver for the device
5064 * @dev: network device
5065 * @buffer: buffer for resulting name
5066 * @len: size of buffer
5068 * Determine network driver for device.
5070 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5072 const struct device_driver *driver;
5073 const struct device *parent;
5075 if (len <= 0 || !buffer)
5079 parent = dev->dev.parent;
5084 driver = parent->driver;
5085 if (driver && driver->name)
5086 strlcpy(buffer, driver->name, len);
5090 static void __net_exit netdev_exit(struct net *net)
5092 kfree(net->dev_name_head);
5093 kfree(net->dev_index_head);
5096 static struct pernet_operations __net_initdata netdev_net_ops = {
5097 .init = netdev_init,
5098 .exit = netdev_exit,
5101 static void __net_exit default_device_exit(struct net *net)
5103 struct net_device *dev;
5105 * Push all migratable of the network devices back to the
5106 * initial network namespace
5110 for_each_netdev(net, dev) {
5112 char fb_name[IFNAMSIZ];
5114 /* Ignore unmoveable devices (i.e. loopback) */
5115 if (dev->features & NETIF_F_NETNS_LOCAL)
5118 /* Delete virtual devices */
5119 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) {
5120 dev->rtnl_link_ops->dellink(dev);
5124 /* Push remaing network devices to init_net */
5125 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5126 err = dev_change_net_namespace(dev, &init_net, fb_name);
5128 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5129 __func__, dev->name, err);
5137 static struct pernet_operations __net_initdata default_device_ops = {
5138 .exit = default_device_exit,
5142 * Initialize the DEV module. At boot time this walks the device list and
5143 * unhooks any devices that fail to initialise (normally hardware not
5144 * present) and leaves us with a valid list of present and active devices.
5149 * This is called single threaded during boot, so no need
5150 * to take the rtnl semaphore.
5152 static int __init net_dev_init(void)
5154 int i, rc = -ENOMEM;
5156 BUG_ON(!dev_boot_phase);
5158 if (dev_proc_init())
5161 if (netdev_kobject_init())
5164 INIT_LIST_HEAD(&ptype_all);
5165 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5166 INIT_LIST_HEAD(&ptype_base[i]);
5168 if (register_pernet_subsys(&netdev_net_ops))
5172 * Initialise the packet receive queues.
5175 for_each_possible_cpu(i) {
5176 struct softnet_data *queue;
5178 queue = &per_cpu(softnet_data, i);
5179 skb_queue_head_init(&queue->input_pkt_queue);
5180 queue->completion_queue = NULL;
5181 INIT_LIST_HEAD(&queue->poll_list);
5183 queue->backlog.poll = process_backlog;
5184 queue->backlog.weight = weight_p;
5185 queue->backlog.gro_list = NULL;
5190 /* The loopback device is special if any other network devices
5191 * is present in a network namespace the loopback device must
5192 * be present. Since we now dynamically allocate and free the
5193 * loopback device ensure this invariant is maintained by
5194 * keeping the loopback device as the first device on the
5195 * list of network devices. Ensuring the loopback devices
5196 * is the first device that appears and the last network device
5199 if (register_pernet_device(&loopback_net_ops))
5202 if (register_pernet_device(&default_device_ops))
5205 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5206 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5208 hotcpu_notifier(dev_cpu_callback, 0);
5216 subsys_initcall(net_dev_init);
5218 EXPORT_SYMBOL(__dev_get_by_index);
5219 EXPORT_SYMBOL(__dev_get_by_name);
5220 EXPORT_SYMBOL(__dev_remove_pack);
5221 EXPORT_SYMBOL(dev_valid_name);
5222 EXPORT_SYMBOL(dev_add_pack);
5223 EXPORT_SYMBOL(dev_alloc_name);
5224 EXPORT_SYMBOL(dev_close);
5225 EXPORT_SYMBOL(dev_get_by_flags);
5226 EXPORT_SYMBOL(dev_get_by_index);
5227 EXPORT_SYMBOL(dev_get_by_name);
5228 EXPORT_SYMBOL(dev_open);
5229 EXPORT_SYMBOL(dev_queue_xmit);
5230 EXPORT_SYMBOL(dev_remove_pack);
5231 EXPORT_SYMBOL(dev_set_allmulti);
5232 EXPORT_SYMBOL(dev_set_promiscuity);
5233 EXPORT_SYMBOL(dev_change_flags);
5234 EXPORT_SYMBOL(dev_set_mtu);
5235 EXPORT_SYMBOL(dev_set_mac_address);
5236 EXPORT_SYMBOL(free_netdev);
5237 EXPORT_SYMBOL(netdev_boot_setup_check);
5238 EXPORT_SYMBOL(netdev_set_master);
5239 EXPORT_SYMBOL(netdev_state_change);
5240 EXPORT_SYMBOL(netif_receive_skb);
5241 EXPORT_SYMBOL(netif_rx);
5242 EXPORT_SYMBOL(register_gifconf);
5243 EXPORT_SYMBOL(register_netdevice);
5244 EXPORT_SYMBOL(register_netdevice_notifier);
5245 EXPORT_SYMBOL(skb_checksum_help);
5246 EXPORT_SYMBOL(synchronize_net);
5247 EXPORT_SYMBOL(unregister_netdevice);
5248 EXPORT_SYMBOL(unregister_netdevice_notifier);
5249 EXPORT_SYMBOL(net_enable_timestamp);
5250 EXPORT_SYMBOL(net_disable_timestamp);
5251 EXPORT_SYMBOL(dev_get_flags);
5253 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
5254 EXPORT_SYMBOL(br_handle_frame_hook);
5255 EXPORT_SYMBOL(br_fdb_get_hook);
5256 EXPORT_SYMBOL(br_fdb_put_hook);
5259 EXPORT_SYMBOL(dev_load);
5261 EXPORT_PER_CPU_SYMBOL(softnet_data);