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"
133 * The list of packet types we will receive (as opposed to discard)
134 * and the routines to invoke.
136 * Why 16. Because with 16 the only overlap we get on a hash of the
137 * low nibble of the protocol value is RARP/SNAP/X.25.
139 * NOTE: That is no longer true with the addition of VLAN tags. Not
140 * sure which should go first, but I bet it won't make much
141 * difference if we are running VLANs. The good news is that
142 * this protocol won't be in the list unless compiled in, so
143 * the average user (w/out VLANs) will not be adversely affected.
160 #define PTYPE_HASH_SIZE (16)
161 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
163 static DEFINE_SPINLOCK(ptype_lock);
164 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
165 static struct list_head ptype_all __read_mostly; /* Taps */
167 #ifdef CONFIG_NET_DMA
169 struct dma_client client;
171 cpumask_t channel_mask;
172 struct dma_chan **channels;
175 static enum dma_state_client
176 netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
177 enum dma_state state);
179 static struct net_dma net_dma = {
181 .event_callback = netdev_dma_event,
187 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
190 * Pure readers hold dev_base_lock for reading.
192 * Writers must hold the rtnl semaphore while they loop through the
193 * dev_base_head list, and hold dev_base_lock for writing when they do the
194 * actual updates. This allows pure readers to access the list even
195 * while a writer is preparing to update it.
197 * To put it another way, dev_base_lock is held for writing only to
198 * protect against pure readers; the rtnl semaphore provides the
199 * protection against other writers.
201 * See, for example usages, register_netdevice() and
202 * unregister_netdevice(), which must be called with the rtnl
205 DEFINE_RWLOCK(dev_base_lock);
207 EXPORT_SYMBOL(dev_base_lock);
209 #define NETDEV_HASHBITS 8
210 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
212 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
214 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
215 return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
218 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
220 return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
223 /* Device list insertion */
224 static int list_netdevice(struct net_device *dev)
226 struct net *net = dev_net(dev);
230 write_lock_bh(&dev_base_lock);
231 list_add_tail(&dev->dev_list, &net->dev_base_head);
232 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
233 hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
234 write_unlock_bh(&dev_base_lock);
238 /* Device list removal */
239 static void unlist_netdevice(struct net_device *dev)
243 /* Unlink dev from the device chain */
244 write_lock_bh(&dev_base_lock);
245 list_del(&dev->dev_list);
246 hlist_del(&dev->name_hlist);
247 hlist_del(&dev->index_hlist);
248 write_unlock_bh(&dev_base_lock);
255 static RAW_NOTIFIER_HEAD(netdev_chain);
258 * Device drivers call our routines to queue packets here. We empty the
259 * queue in the local softnet handler.
262 DEFINE_PER_CPU(struct softnet_data, softnet_data);
264 #ifdef CONFIG_LOCKDEP
266 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
267 * according to dev->type
269 static const unsigned short netdev_lock_type[] =
270 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
271 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
272 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
273 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
274 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
275 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
276 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
277 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
278 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
279 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
280 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
281 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
282 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
283 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID,
286 static const char *netdev_lock_name[] =
287 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
288 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
289 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
290 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
291 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
292 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
293 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
294 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
295 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
296 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
297 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
298 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
299 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
300 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID",
303 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
304 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
306 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
310 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
311 if (netdev_lock_type[i] == dev_type)
313 /* the last key is used by default */
314 return ARRAY_SIZE(netdev_lock_type) - 1;
317 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
318 unsigned short dev_type)
322 i = netdev_lock_pos(dev_type);
323 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
324 netdev_lock_name[i]);
327 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
331 i = netdev_lock_pos(dev->type);
332 lockdep_set_class_and_name(&dev->addr_list_lock,
333 &netdev_addr_lock_key[i],
334 netdev_lock_name[i]);
337 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
338 unsigned short dev_type)
341 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
346 /*******************************************************************************
348 Protocol management and registration routines
350 *******************************************************************************/
353 * Add a protocol ID to the list. Now that the input handler is
354 * smarter we can dispense with all the messy stuff that used to be
357 * BEWARE!!! Protocol handlers, mangling input packets,
358 * MUST BE last in hash buckets and checking protocol handlers
359 * MUST start from promiscuous ptype_all chain in net_bh.
360 * It is true now, do not change it.
361 * Explanation follows: if protocol handler, mangling packet, will
362 * be the first on list, it is not able to sense, that packet
363 * is cloned and should be copied-on-write, so that it will
364 * change it and subsequent readers will get broken packet.
369 * dev_add_pack - add packet handler
370 * @pt: packet type declaration
372 * Add a protocol handler to the networking stack. The passed &packet_type
373 * is linked into kernel lists and may not be freed until it has been
374 * removed from the kernel lists.
376 * This call does not sleep therefore it can not
377 * guarantee all CPU's that are in middle of receiving packets
378 * will see the new packet type (until the next received packet).
381 void dev_add_pack(struct packet_type *pt)
385 spin_lock_bh(&ptype_lock);
386 if (pt->type == htons(ETH_P_ALL))
387 list_add_rcu(&pt->list, &ptype_all);
389 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
390 list_add_rcu(&pt->list, &ptype_base[hash]);
392 spin_unlock_bh(&ptype_lock);
396 * __dev_remove_pack - remove packet handler
397 * @pt: packet type declaration
399 * Remove a protocol handler that was previously added to the kernel
400 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
401 * from the kernel lists and can be freed or reused once this function
404 * The packet type might still be in use by receivers
405 * and must not be freed until after all the CPU's have gone
406 * through a quiescent state.
408 void __dev_remove_pack(struct packet_type *pt)
410 struct list_head *head;
411 struct packet_type *pt1;
413 spin_lock_bh(&ptype_lock);
415 if (pt->type == htons(ETH_P_ALL))
418 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
420 list_for_each_entry(pt1, head, list) {
422 list_del_rcu(&pt->list);
427 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
429 spin_unlock_bh(&ptype_lock);
432 * dev_remove_pack - remove packet handler
433 * @pt: packet type declaration
435 * Remove a protocol handler that was previously added to the kernel
436 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
437 * from the kernel lists and can be freed or reused once this function
440 * This call sleeps to guarantee that no CPU is looking at the packet
443 void dev_remove_pack(struct packet_type *pt)
445 __dev_remove_pack(pt);
450 /******************************************************************************
452 Device Boot-time Settings Routines
454 *******************************************************************************/
456 /* Boot time configuration table */
457 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
460 * netdev_boot_setup_add - add new setup entry
461 * @name: name of the device
462 * @map: configured settings for the device
464 * Adds new setup entry to the dev_boot_setup list. The function
465 * returns 0 on error and 1 on success. This is a generic routine to
468 static int netdev_boot_setup_add(char *name, struct ifmap *map)
470 struct netdev_boot_setup *s;
474 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
475 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
476 memset(s[i].name, 0, sizeof(s[i].name));
477 strlcpy(s[i].name, name, IFNAMSIZ);
478 memcpy(&s[i].map, map, sizeof(s[i].map));
483 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
487 * netdev_boot_setup_check - check boot time settings
488 * @dev: the netdevice
490 * Check boot time settings for the device.
491 * The found settings are set for the device to be used
492 * later in the device probing.
493 * Returns 0 if no settings found, 1 if they are.
495 int netdev_boot_setup_check(struct net_device *dev)
497 struct netdev_boot_setup *s = dev_boot_setup;
500 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
501 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
502 !strcmp(dev->name, s[i].name)) {
503 dev->irq = s[i].map.irq;
504 dev->base_addr = s[i].map.base_addr;
505 dev->mem_start = s[i].map.mem_start;
506 dev->mem_end = s[i].map.mem_end;
515 * netdev_boot_base - get address from boot time settings
516 * @prefix: prefix for network device
517 * @unit: id for network device
519 * Check boot time settings for the base address of device.
520 * The found settings are set for the device to be used
521 * later in the device probing.
522 * Returns 0 if no settings found.
524 unsigned long netdev_boot_base(const char *prefix, int unit)
526 const struct netdev_boot_setup *s = dev_boot_setup;
530 sprintf(name, "%s%d", prefix, unit);
533 * If device already registered then return base of 1
534 * to indicate not to probe for this interface
536 if (__dev_get_by_name(&init_net, name))
539 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
540 if (!strcmp(name, s[i].name))
541 return s[i].map.base_addr;
546 * Saves at boot time configured settings for any netdevice.
548 int __init netdev_boot_setup(char *str)
553 str = get_options(str, ARRAY_SIZE(ints), ints);
558 memset(&map, 0, sizeof(map));
562 map.base_addr = ints[2];
564 map.mem_start = ints[3];
566 map.mem_end = ints[4];
568 /* Add new entry to the list */
569 return netdev_boot_setup_add(str, &map);
572 __setup("netdev=", netdev_boot_setup);
574 /*******************************************************************************
576 Device Interface Subroutines
578 *******************************************************************************/
581 * __dev_get_by_name - find a device by its name
582 * @net: the applicable net namespace
583 * @name: name to find
585 * Find an interface by name. Must be called under RTNL semaphore
586 * or @dev_base_lock. If the name is found a pointer to the device
587 * is returned. If the name is not found then %NULL is returned. The
588 * reference counters are not incremented so the caller must be
589 * careful with locks.
592 struct net_device *__dev_get_by_name(struct net *net, const char *name)
594 struct hlist_node *p;
596 hlist_for_each(p, dev_name_hash(net, name)) {
597 struct net_device *dev
598 = hlist_entry(p, struct net_device, name_hlist);
599 if (!strncmp(dev->name, name, IFNAMSIZ))
606 * dev_get_by_name - find a device by its name
607 * @net: the applicable net namespace
608 * @name: name to find
610 * Find an interface by name. This can be called from any
611 * context and does its own locking. The returned handle has
612 * the usage count incremented and the caller must use dev_put() to
613 * release it when it is no longer needed. %NULL is returned if no
614 * matching device is found.
617 struct net_device *dev_get_by_name(struct net *net, const char *name)
619 struct net_device *dev;
621 read_lock(&dev_base_lock);
622 dev = __dev_get_by_name(net, name);
625 read_unlock(&dev_base_lock);
630 * __dev_get_by_index - find a device by its ifindex
631 * @net: the applicable net namespace
632 * @ifindex: index of device
634 * Search for an interface by index. Returns %NULL if the device
635 * is not found or a pointer to the device. The device has not
636 * had its reference counter increased so the caller must be careful
637 * about locking. The caller must hold either the RTNL semaphore
641 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
643 struct hlist_node *p;
645 hlist_for_each(p, dev_index_hash(net, ifindex)) {
646 struct net_device *dev
647 = hlist_entry(p, struct net_device, index_hlist);
648 if (dev->ifindex == ifindex)
656 * dev_get_by_index - find a device by its ifindex
657 * @net: the applicable net namespace
658 * @ifindex: index of device
660 * Search for an interface by index. Returns NULL if the device
661 * is not found or a pointer to the device. The device returned has
662 * had a reference added and the pointer is safe until the user calls
663 * dev_put to indicate they have finished with it.
666 struct net_device *dev_get_by_index(struct net *net, int ifindex)
668 struct net_device *dev;
670 read_lock(&dev_base_lock);
671 dev = __dev_get_by_index(net, ifindex);
674 read_unlock(&dev_base_lock);
679 * dev_getbyhwaddr - find a device by its hardware address
680 * @net: the applicable net namespace
681 * @type: media type of device
682 * @ha: hardware address
684 * Search for an interface by MAC address. Returns NULL if the device
685 * is not found or a pointer to the device. The caller must hold the
686 * rtnl semaphore. The returned device has not had its ref count increased
687 * and the caller must therefore be careful about locking
690 * If the API was consistent this would be __dev_get_by_hwaddr
693 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
695 struct net_device *dev;
699 for_each_netdev(net, dev)
700 if (dev->type == type &&
701 !memcmp(dev->dev_addr, ha, dev->addr_len))
707 EXPORT_SYMBOL(dev_getbyhwaddr);
709 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
711 struct net_device *dev;
714 for_each_netdev(net, dev)
715 if (dev->type == type)
721 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
723 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
725 struct net_device *dev;
728 dev = __dev_getfirstbyhwtype(net, type);
735 EXPORT_SYMBOL(dev_getfirstbyhwtype);
738 * dev_get_by_flags - find any device with given flags
739 * @net: the applicable net namespace
740 * @if_flags: IFF_* values
741 * @mask: bitmask of bits in if_flags to check
743 * Search for any interface with the given flags. Returns NULL if a device
744 * is not found or a pointer to the device. The device returned has
745 * had a reference added and the pointer is safe until the user calls
746 * dev_put to indicate they have finished with it.
749 struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
751 struct net_device *dev, *ret;
754 read_lock(&dev_base_lock);
755 for_each_netdev(net, dev) {
756 if (((dev->flags ^ if_flags) & mask) == 0) {
762 read_unlock(&dev_base_lock);
767 * dev_valid_name - check if name is okay for network device
770 * Network device names need to be valid file names to
771 * to allow sysfs to work. We also disallow any kind of
774 int dev_valid_name(const char *name)
778 if (strlen(name) >= IFNAMSIZ)
780 if (!strcmp(name, ".") || !strcmp(name, ".."))
784 if (*name == '/' || isspace(*name))
792 * __dev_alloc_name - allocate a name for a device
793 * @net: network namespace to allocate the device name in
794 * @name: name format string
795 * @buf: scratch buffer and result name string
797 * Passed a format string - eg "lt%d" it will try and find a suitable
798 * id. It scans list of devices to build up a free map, then chooses
799 * the first empty slot. The caller must hold the dev_base or rtnl lock
800 * while allocating the name and adding the device in order to avoid
802 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
803 * Returns the number of the unit assigned or a negative errno code.
806 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
810 const int max_netdevices = 8*PAGE_SIZE;
811 unsigned long *inuse;
812 struct net_device *d;
814 p = strnchr(name, IFNAMSIZ-1, '%');
817 * Verify the string as this thing may have come from
818 * the user. There must be either one "%d" and no other "%"
821 if (p[1] != 'd' || strchr(p + 2, '%'))
824 /* Use one page as a bit array of possible slots */
825 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
829 for_each_netdev(net, d) {
830 if (!sscanf(d->name, name, &i))
832 if (i < 0 || i >= max_netdevices)
835 /* avoid cases where sscanf is not exact inverse of printf */
836 snprintf(buf, IFNAMSIZ, name, i);
837 if (!strncmp(buf, d->name, IFNAMSIZ))
841 i = find_first_zero_bit(inuse, max_netdevices);
842 free_page((unsigned long) inuse);
845 snprintf(buf, IFNAMSIZ, name, i);
846 if (!__dev_get_by_name(net, buf))
849 /* It is possible to run out of possible slots
850 * when the name is long and there isn't enough space left
851 * for the digits, or if all bits are used.
857 * dev_alloc_name - allocate a name for a device
859 * @name: name format string
861 * Passed a format string - eg "lt%d" it will try and find a suitable
862 * id. It scans list of devices to build up a free map, then chooses
863 * the first empty slot. The caller must hold the dev_base or rtnl lock
864 * while allocating the name and adding the device in order to avoid
866 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
867 * Returns the number of the unit assigned or a negative errno code.
870 int dev_alloc_name(struct net_device *dev, const char *name)
876 BUG_ON(!dev_net(dev));
878 ret = __dev_alloc_name(net, name, buf);
880 strlcpy(dev->name, buf, IFNAMSIZ);
886 * dev_change_name - change name of a device
888 * @newname: name (or format string) must be at least IFNAMSIZ
890 * Change name of a device, can pass format strings "eth%d".
893 int dev_change_name(struct net_device *dev, const char *newname)
895 char oldname[IFNAMSIZ];
901 BUG_ON(!dev_net(dev));
904 if (dev->flags & IFF_UP)
907 if (!dev_valid_name(newname))
910 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
913 memcpy(oldname, dev->name, IFNAMSIZ);
915 if (strchr(newname, '%')) {
916 err = dev_alloc_name(dev, newname);
920 else if (__dev_get_by_name(net, newname))
923 strlcpy(dev->name, newname, IFNAMSIZ);
926 /* For now only devices in the initial network namespace
929 if (net == &init_net) {
930 ret = device_rename(&dev->dev, dev->name);
932 memcpy(dev->name, oldname, IFNAMSIZ);
937 write_lock_bh(&dev_base_lock);
938 hlist_del(&dev->name_hlist);
939 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
940 write_unlock_bh(&dev_base_lock);
942 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
943 ret = notifier_to_errno(ret);
948 "%s: name change rollback failed: %d.\n",
952 memcpy(dev->name, oldname, IFNAMSIZ);
961 * dev_set_alias - change ifalias of a device
963 * @alias: name up to IFALIASZ
964 * @len: limit of bytes to copy from info
966 * Set ifalias for a device,
968 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
983 dev->ifalias = krealloc(dev->ifalias, len+1, GFP_KERNEL);
987 strlcpy(dev->ifalias, alias, len+1);
993 * netdev_features_change - device changes features
994 * @dev: device to cause notification
996 * Called to indicate a device has changed features.
998 void netdev_features_change(struct net_device *dev)
1000 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1002 EXPORT_SYMBOL(netdev_features_change);
1005 * netdev_state_change - device changes state
1006 * @dev: device to cause notification
1008 * Called to indicate a device has changed state. This function calls
1009 * the notifier chains for netdev_chain and sends a NEWLINK message
1010 * to the routing socket.
1012 void netdev_state_change(struct net_device *dev)
1014 if (dev->flags & IFF_UP) {
1015 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1016 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1020 void netdev_bonding_change(struct net_device *dev)
1022 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
1024 EXPORT_SYMBOL(netdev_bonding_change);
1027 * dev_load - load a network module
1028 * @net: the applicable net namespace
1029 * @name: name of interface
1031 * If a network interface is not present and the process has suitable
1032 * privileges this function loads the module. If module loading is not
1033 * available in this kernel then it becomes a nop.
1036 void dev_load(struct net *net, const char *name)
1038 struct net_device *dev;
1040 read_lock(&dev_base_lock);
1041 dev = __dev_get_by_name(net, name);
1042 read_unlock(&dev_base_lock);
1044 if (!dev && capable(CAP_SYS_MODULE))
1045 request_module("%s", name);
1049 * dev_open - prepare an interface for use.
1050 * @dev: device to open
1052 * Takes a device from down to up state. The device's private open
1053 * function is invoked and then the multicast lists are loaded. Finally
1054 * the device is moved into the up state and a %NETDEV_UP message is
1055 * sent to the netdev notifier chain.
1057 * Calling this function on an active interface is a nop. On a failure
1058 * a negative errno code is returned.
1060 int dev_open(struct net_device *dev)
1062 const struct net_device_ops *ops = dev->netdev_ops;
1071 if (dev->flags & IFF_UP)
1075 * Is it even present?
1077 if (!netif_device_present(dev))
1081 * Call device private open method
1083 set_bit(__LINK_STATE_START, &dev->state);
1085 if (ops->ndo_validate_addr)
1086 ret = ops->ndo_validate_addr(dev);
1088 if (!ret && ops->ndo_open)
1089 ret = ops->ndo_open(dev);
1092 * If it went open OK then:
1096 clear_bit(__LINK_STATE_START, &dev->state);
1101 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);
1185 * dev_disable_lro - disable Large Receive Offload on a device
1188 * Disable Large Receive Offload (LRO) on a net device. Must be
1189 * called under RTNL. This is needed if received packets may be
1190 * forwarded to another interface.
1192 void dev_disable_lro(struct net_device *dev)
1194 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1195 dev->ethtool_ops->set_flags) {
1196 u32 flags = dev->ethtool_ops->get_flags(dev);
1197 if (flags & ETH_FLAG_LRO) {
1198 flags &= ~ETH_FLAG_LRO;
1199 dev->ethtool_ops->set_flags(dev, flags);
1202 WARN_ON(dev->features & NETIF_F_LRO);
1204 EXPORT_SYMBOL(dev_disable_lro);
1207 static int dev_boot_phase = 1;
1210 * Device change register/unregister. These are not inline or static
1211 * as we export them to the world.
1215 * register_netdevice_notifier - register a network notifier block
1218 * Register a notifier to be called when network device events occur.
1219 * The notifier passed is linked into the kernel structures and must
1220 * not be reused until it has been unregistered. A negative errno code
1221 * is returned on a failure.
1223 * When registered all registration and up events are replayed
1224 * to the new notifier to allow device to have a race free
1225 * view of the network device list.
1228 int register_netdevice_notifier(struct notifier_block *nb)
1230 struct net_device *dev;
1231 struct net_device *last;
1236 err = raw_notifier_chain_register(&netdev_chain, nb);
1242 for_each_netdev(net, dev) {
1243 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1244 err = notifier_to_errno(err);
1248 if (!(dev->flags & IFF_UP))
1251 nb->notifier_call(nb, NETDEV_UP, dev);
1262 for_each_netdev(net, dev) {
1266 if (dev->flags & IFF_UP) {
1267 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1268 nb->notifier_call(nb, NETDEV_DOWN, dev);
1270 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1274 raw_notifier_chain_unregister(&netdev_chain, nb);
1279 * unregister_netdevice_notifier - unregister a network notifier block
1282 * Unregister a notifier previously registered by
1283 * register_netdevice_notifier(). The notifier is unlinked into the
1284 * kernel structures and may then be reused. A negative errno code
1285 * is returned on a failure.
1288 int unregister_netdevice_notifier(struct notifier_block *nb)
1293 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1299 * call_netdevice_notifiers - call all network notifier blocks
1300 * @val: value passed unmodified to notifier function
1301 * @dev: net_device pointer passed unmodified to notifier function
1303 * Call all network notifier blocks. Parameters and return value
1304 * are as for raw_notifier_call_chain().
1307 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1309 return raw_notifier_call_chain(&netdev_chain, val, dev);
1312 /* When > 0 there are consumers of rx skb time stamps */
1313 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1315 void net_enable_timestamp(void)
1317 atomic_inc(&netstamp_needed);
1320 void net_disable_timestamp(void)
1322 atomic_dec(&netstamp_needed);
1325 static inline void net_timestamp(struct sk_buff *skb)
1327 if (atomic_read(&netstamp_needed))
1328 __net_timestamp(skb);
1330 skb->tstamp.tv64 = 0;
1334 * Support routine. Sends outgoing frames to any network
1335 * taps currently in use.
1338 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1340 struct packet_type *ptype;
1345 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1346 /* Never send packets back to the socket
1347 * they originated from - MvS (miquels@drinkel.ow.org)
1349 if ((ptype->dev == dev || !ptype->dev) &&
1350 (ptype->af_packet_priv == NULL ||
1351 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1352 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1356 /* skb->nh should be correctly
1357 set by sender, so that the second statement is
1358 just protection against buggy protocols.
1360 skb_reset_mac_header(skb2);
1362 if (skb_network_header(skb2) < skb2->data ||
1363 skb2->network_header > skb2->tail) {
1364 if (net_ratelimit())
1365 printk(KERN_CRIT "protocol %04x is "
1367 skb2->protocol, dev->name);
1368 skb_reset_network_header(skb2);
1371 skb2->transport_header = skb2->network_header;
1372 skb2->pkt_type = PACKET_OUTGOING;
1373 ptype->func(skb2, skb->dev, ptype, skb->dev);
1380 static inline void __netif_reschedule(struct Qdisc *q)
1382 struct softnet_data *sd;
1383 unsigned long flags;
1385 local_irq_save(flags);
1386 sd = &__get_cpu_var(softnet_data);
1387 q->next_sched = sd->output_queue;
1388 sd->output_queue = q;
1389 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1390 local_irq_restore(flags);
1393 void __netif_schedule(struct Qdisc *q)
1395 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1396 __netif_reschedule(q);
1398 EXPORT_SYMBOL(__netif_schedule);
1400 void dev_kfree_skb_irq(struct sk_buff *skb)
1402 if (atomic_dec_and_test(&skb->users)) {
1403 struct softnet_data *sd;
1404 unsigned long flags;
1406 local_irq_save(flags);
1407 sd = &__get_cpu_var(softnet_data);
1408 skb->next = sd->completion_queue;
1409 sd->completion_queue = skb;
1410 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1411 local_irq_restore(flags);
1414 EXPORT_SYMBOL(dev_kfree_skb_irq);
1416 void dev_kfree_skb_any(struct sk_buff *skb)
1418 if (in_irq() || irqs_disabled())
1419 dev_kfree_skb_irq(skb);
1423 EXPORT_SYMBOL(dev_kfree_skb_any);
1427 * netif_device_detach - mark device as removed
1428 * @dev: network device
1430 * Mark device as removed from system and therefore no longer available.
1432 void netif_device_detach(struct net_device *dev)
1434 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1435 netif_running(dev)) {
1436 netif_stop_queue(dev);
1439 EXPORT_SYMBOL(netif_device_detach);
1442 * netif_device_attach - mark device as attached
1443 * @dev: network device
1445 * Mark device as attached from system and restart if needed.
1447 void netif_device_attach(struct net_device *dev)
1449 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1450 netif_running(dev)) {
1451 netif_wake_queue(dev);
1452 __netdev_watchdog_up(dev);
1455 EXPORT_SYMBOL(netif_device_attach);
1457 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1459 return ((features & NETIF_F_GEN_CSUM) ||
1460 ((features & NETIF_F_IP_CSUM) &&
1461 protocol == htons(ETH_P_IP)) ||
1462 ((features & NETIF_F_IPV6_CSUM) &&
1463 protocol == htons(ETH_P_IPV6)));
1466 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1468 if (can_checksum_protocol(dev->features, skb->protocol))
1471 if (skb->protocol == htons(ETH_P_8021Q)) {
1472 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1473 if (can_checksum_protocol(dev->features & dev->vlan_features,
1474 veh->h_vlan_encapsulated_proto))
1482 * Invalidate hardware checksum when packet is to be mangled, and
1483 * complete checksum manually on outgoing path.
1485 int skb_checksum_help(struct sk_buff *skb)
1488 int ret = 0, offset;
1490 if (skb->ip_summed == CHECKSUM_COMPLETE)
1491 goto out_set_summed;
1493 if (unlikely(skb_shinfo(skb)->gso_size)) {
1494 /* Let GSO fix up the checksum. */
1495 goto out_set_summed;
1498 offset = skb->csum_start - skb_headroom(skb);
1499 BUG_ON(offset >= skb_headlen(skb));
1500 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1502 offset += skb->csum_offset;
1503 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1505 if (skb_cloned(skb) &&
1506 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1507 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1512 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1514 skb->ip_summed = CHECKSUM_NONE;
1520 * skb_gso_segment - Perform segmentation on skb.
1521 * @skb: buffer to segment
1522 * @features: features for the output path (see dev->features)
1524 * This function segments the given skb and returns a list of segments.
1526 * It may return NULL if the skb requires no segmentation. This is
1527 * only possible when GSO is used for verifying header integrity.
1529 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1531 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1532 struct packet_type *ptype;
1533 __be16 type = skb->protocol;
1536 skb_reset_mac_header(skb);
1537 skb->mac_len = skb->network_header - skb->mac_header;
1538 __skb_pull(skb, skb->mac_len);
1540 if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
1541 if (skb_header_cloned(skb) &&
1542 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1543 return ERR_PTR(err);
1547 list_for_each_entry_rcu(ptype,
1548 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1549 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1550 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1551 err = ptype->gso_send_check(skb);
1552 segs = ERR_PTR(err);
1553 if (err || skb_gso_ok(skb, features))
1555 __skb_push(skb, (skb->data -
1556 skb_network_header(skb)));
1558 segs = ptype->gso_segment(skb, features);
1564 __skb_push(skb, skb->data - skb_mac_header(skb));
1569 EXPORT_SYMBOL(skb_gso_segment);
1571 /* Take action when hardware reception checksum errors are detected. */
1573 void netdev_rx_csum_fault(struct net_device *dev)
1575 if (net_ratelimit()) {
1576 printk(KERN_ERR "%s: hw csum failure.\n",
1577 dev ? dev->name : "<unknown>");
1581 EXPORT_SYMBOL(netdev_rx_csum_fault);
1584 /* Actually, we should eliminate this check as soon as we know, that:
1585 * 1. IOMMU is present and allows to map all the memory.
1586 * 2. No high memory really exists on this machine.
1589 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1591 #ifdef CONFIG_HIGHMEM
1594 if (dev->features & NETIF_F_HIGHDMA)
1597 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1598 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1606 void (*destructor)(struct sk_buff *skb);
1609 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1611 static void dev_gso_skb_destructor(struct sk_buff *skb)
1613 struct dev_gso_cb *cb;
1616 struct sk_buff *nskb = skb->next;
1618 skb->next = nskb->next;
1621 } while (skb->next);
1623 cb = DEV_GSO_CB(skb);
1625 cb->destructor(skb);
1629 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1630 * @skb: buffer to segment
1632 * This function segments the given skb and stores the list of segments
1635 static int dev_gso_segment(struct sk_buff *skb)
1637 struct net_device *dev = skb->dev;
1638 struct sk_buff *segs;
1639 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1642 segs = skb_gso_segment(skb, features);
1644 /* Verifying header integrity only. */
1649 return PTR_ERR(segs);
1652 DEV_GSO_CB(skb)->destructor = skb->destructor;
1653 skb->destructor = dev_gso_skb_destructor;
1658 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1659 struct netdev_queue *txq)
1661 const struct net_device_ops *ops = dev->netdev_ops;
1663 prefetch(&dev->netdev_ops->ndo_start_xmit);
1664 if (likely(!skb->next)) {
1665 if (!list_empty(&ptype_all))
1666 dev_queue_xmit_nit(skb, dev);
1668 if (netif_needs_gso(dev, skb)) {
1669 if (unlikely(dev_gso_segment(skb)))
1675 return ops->ndo_start_xmit(skb, dev);
1680 struct sk_buff *nskb = skb->next;
1683 skb->next = nskb->next;
1685 rc = ops->ndo_start_xmit(nskb, dev);
1687 nskb->next = skb->next;
1691 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1692 return NETDEV_TX_BUSY;
1693 } while (skb->next);
1695 skb->destructor = DEV_GSO_CB(skb)->destructor;
1702 static u32 simple_tx_hashrnd;
1703 static int simple_tx_hashrnd_initialized = 0;
1705 static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb)
1707 u32 addr1, addr2, ports;
1711 if (unlikely(!simple_tx_hashrnd_initialized)) {
1712 get_random_bytes(&simple_tx_hashrnd, 4);
1713 simple_tx_hashrnd_initialized = 1;
1716 switch (skb->protocol) {
1717 case htons(ETH_P_IP):
1718 if (!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)))
1719 ip_proto = ip_hdr(skb)->protocol;
1720 addr1 = ip_hdr(skb)->saddr;
1721 addr2 = ip_hdr(skb)->daddr;
1722 ihl = ip_hdr(skb)->ihl;
1724 case htons(ETH_P_IPV6):
1725 ip_proto = ipv6_hdr(skb)->nexthdr;
1726 addr1 = ipv6_hdr(skb)->saddr.s6_addr32[3];
1727 addr2 = ipv6_hdr(skb)->daddr.s6_addr32[3];
1742 case IPPROTO_UDPLITE:
1743 ports = *((u32 *) (skb_network_header(skb) + (ihl * 4)));
1751 hash = jhash_3words(addr1, addr2, ports, simple_tx_hashrnd);
1753 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1756 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
1757 struct sk_buff *skb)
1759 const struct net_device_ops *ops = dev->netdev_ops;
1760 u16 queue_index = 0;
1762 if (ops->ndo_select_queue)
1763 queue_index = ops->ndo_select_queue(dev, skb);
1764 else if (dev->real_num_tx_queues > 1)
1765 queue_index = simple_tx_hash(dev, skb);
1767 skb_set_queue_mapping(skb, queue_index);
1768 return netdev_get_tx_queue(dev, queue_index);
1772 * dev_queue_xmit - transmit a buffer
1773 * @skb: buffer to transmit
1775 * Queue a buffer for transmission to a network device. The caller must
1776 * have set the device and priority and built the buffer before calling
1777 * this function. The function can be called from an interrupt.
1779 * A negative errno code is returned on a failure. A success does not
1780 * guarantee the frame will be transmitted as it may be dropped due
1781 * to congestion or traffic shaping.
1783 * -----------------------------------------------------------------------------------
1784 * I notice this method can also return errors from the queue disciplines,
1785 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1788 * Regardless of the return value, the skb is consumed, so it is currently
1789 * difficult to retry a send to this method. (You can bump the ref count
1790 * before sending to hold a reference for retry if you are careful.)
1792 * When calling this method, interrupts MUST be enabled. This is because
1793 * the BH enable code must have IRQs enabled so that it will not deadlock.
1796 int dev_queue_xmit(struct sk_buff *skb)
1798 struct net_device *dev = skb->dev;
1799 struct netdev_queue *txq;
1803 /* GSO will handle the following emulations directly. */
1804 if (netif_needs_gso(dev, skb))
1807 if (skb_shinfo(skb)->frag_list &&
1808 !(dev->features & NETIF_F_FRAGLIST) &&
1809 __skb_linearize(skb))
1812 /* Fragmented skb is linearized if device does not support SG,
1813 * or if at least one of fragments is in highmem and device
1814 * does not support DMA from it.
1816 if (skb_shinfo(skb)->nr_frags &&
1817 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1818 __skb_linearize(skb))
1821 /* If packet is not checksummed and device does not support
1822 * checksumming for this protocol, complete checksumming here.
1824 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1825 skb_set_transport_header(skb, skb->csum_start -
1827 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
1832 /* Disable soft irqs for various locks below. Also
1833 * stops preemption for RCU.
1837 txq = dev_pick_tx(dev, skb);
1838 q = rcu_dereference(txq->qdisc);
1840 #ifdef CONFIG_NET_CLS_ACT
1841 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1844 spinlock_t *root_lock = qdisc_lock(q);
1846 spin_lock(root_lock);
1848 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
1852 rc = qdisc_enqueue_root(skb, q);
1855 spin_unlock(root_lock);
1860 /* The device has no queue. Common case for software devices:
1861 loopback, all the sorts of tunnels...
1863 Really, it is unlikely that netif_tx_lock protection is necessary
1864 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1866 However, it is possible, that they rely on protection
1869 Check this and shot the lock. It is not prone from deadlocks.
1870 Either shot noqueue qdisc, it is even simpler 8)
1872 if (dev->flags & IFF_UP) {
1873 int cpu = smp_processor_id(); /* ok because BHs are off */
1875 if (txq->xmit_lock_owner != cpu) {
1877 HARD_TX_LOCK(dev, txq, cpu);
1879 if (!netif_tx_queue_stopped(txq)) {
1881 if (!dev_hard_start_xmit(skb, dev, txq)) {
1882 HARD_TX_UNLOCK(dev, txq);
1886 HARD_TX_UNLOCK(dev, txq);
1887 if (net_ratelimit())
1888 printk(KERN_CRIT "Virtual device %s asks to "
1889 "queue packet!\n", dev->name);
1891 /* Recursion is detected! It is possible,
1893 if (net_ratelimit())
1894 printk(KERN_CRIT "Dead loop on virtual device "
1895 "%s, fix it urgently!\n", dev->name);
1900 rcu_read_unlock_bh();
1906 rcu_read_unlock_bh();
1911 /*=======================================================================
1913 =======================================================================*/
1915 int netdev_max_backlog __read_mostly = 1000;
1916 int netdev_budget __read_mostly = 300;
1917 int weight_p __read_mostly = 64; /* old backlog weight */
1919 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1923 * netif_rx - post buffer to the network code
1924 * @skb: buffer to post
1926 * This function receives a packet from a device driver and queues it for
1927 * the upper (protocol) levels to process. It always succeeds. The buffer
1928 * may be dropped during processing for congestion control or by the
1932 * NET_RX_SUCCESS (no congestion)
1933 * NET_RX_DROP (packet was dropped)
1937 int netif_rx(struct sk_buff *skb)
1939 struct softnet_data *queue;
1940 unsigned long flags;
1942 /* if netpoll wants it, pretend we never saw it */
1943 if (netpoll_rx(skb))
1946 if (!skb->tstamp.tv64)
1950 * The code is rearranged so that the path is the most
1951 * short when CPU is congested, but is still operating.
1953 local_irq_save(flags);
1954 queue = &__get_cpu_var(softnet_data);
1956 __get_cpu_var(netdev_rx_stat).total++;
1957 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1958 if (queue->input_pkt_queue.qlen) {
1960 __skb_queue_tail(&queue->input_pkt_queue, skb);
1961 local_irq_restore(flags);
1962 return NET_RX_SUCCESS;
1965 napi_schedule(&queue->backlog);
1969 __get_cpu_var(netdev_rx_stat).dropped++;
1970 local_irq_restore(flags);
1976 int netif_rx_ni(struct sk_buff *skb)
1981 err = netif_rx(skb);
1982 if (local_softirq_pending())
1989 EXPORT_SYMBOL(netif_rx_ni);
1991 static void net_tx_action(struct softirq_action *h)
1993 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1995 if (sd->completion_queue) {
1996 struct sk_buff *clist;
1998 local_irq_disable();
1999 clist = sd->completion_queue;
2000 sd->completion_queue = NULL;
2004 struct sk_buff *skb = clist;
2005 clist = clist->next;
2007 WARN_ON(atomic_read(&skb->users));
2012 if (sd->output_queue) {
2015 local_irq_disable();
2016 head = sd->output_queue;
2017 sd->output_queue = NULL;
2021 struct Qdisc *q = head;
2022 spinlock_t *root_lock;
2024 head = head->next_sched;
2026 root_lock = qdisc_lock(q);
2027 if (spin_trylock(root_lock)) {
2028 smp_mb__before_clear_bit();
2029 clear_bit(__QDISC_STATE_SCHED,
2032 spin_unlock(root_lock);
2034 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2036 __netif_reschedule(q);
2038 smp_mb__before_clear_bit();
2039 clear_bit(__QDISC_STATE_SCHED,
2047 static inline int deliver_skb(struct sk_buff *skb,
2048 struct packet_type *pt_prev,
2049 struct net_device *orig_dev)
2051 atomic_inc(&skb->users);
2052 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2055 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2056 /* These hooks defined here for ATM */
2058 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
2059 unsigned char *addr);
2060 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
2063 * If bridge module is loaded call bridging hook.
2064 * returns NULL if packet was consumed.
2066 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2067 struct sk_buff *skb) __read_mostly;
2068 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2069 struct packet_type **pt_prev, int *ret,
2070 struct net_device *orig_dev)
2072 struct net_bridge_port *port;
2074 if (skb->pkt_type == PACKET_LOOPBACK ||
2075 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2079 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2083 return br_handle_frame_hook(port, skb);
2086 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2089 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2090 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2091 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2093 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2094 struct packet_type **pt_prev,
2096 struct net_device *orig_dev)
2098 if (skb->dev->macvlan_port == NULL)
2102 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2105 return macvlan_handle_frame_hook(skb);
2108 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2111 #ifdef CONFIG_NET_CLS_ACT
2112 /* TODO: Maybe we should just force sch_ingress to be compiled in
2113 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2114 * a compare and 2 stores extra right now if we dont have it on
2115 * but have CONFIG_NET_CLS_ACT
2116 * NOTE: This doesnt stop any functionality; if you dont have
2117 * the ingress scheduler, you just cant add policies on ingress.
2120 static int ing_filter(struct sk_buff *skb)
2122 struct net_device *dev = skb->dev;
2123 u32 ttl = G_TC_RTTL(skb->tc_verd);
2124 struct netdev_queue *rxq;
2125 int result = TC_ACT_OK;
2128 if (MAX_RED_LOOP < ttl++) {
2130 "Redir loop detected Dropping packet (%d->%d)\n",
2131 skb->iif, dev->ifindex);
2135 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2136 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2138 rxq = &dev->rx_queue;
2141 if (q != &noop_qdisc) {
2142 spin_lock(qdisc_lock(q));
2143 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2144 result = qdisc_enqueue_root(skb, q);
2145 spin_unlock(qdisc_lock(q));
2151 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2152 struct packet_type **pt_prev,
2153 int *ret, struct net_device *orig_dev)
2155 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2159 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2162 /* Huh? Why does turning on AF_PACKET affect this? */
2163 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2166 switch (ing_filter(skb)) {
2180 * netif_nit_deliver - deliver received packets to network taps
2183 * This function is used to deliver incoming packets to network
2184 * taps. It should be used when the normal netif_receive_skb path
2185 * is bypassed, for example because of VLAN acceleration.
2187 void netif_nit_deliver(struct sk_buff *skb)
2189 struct packet_type *ptype;
2191 if (list_empty(&ptype_all))
2194 skb_reset_network_header(skb);
2195 skb_reset_transport_header(skb);
2196 skb->mac_len = skb->network_header - skb->mac_header;
2199 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2200 if (!ptype->dev || ptype->dev == skb->dev)
2201 deliver_skb(skb, ptype, skb->dev);
2207 * netif_receive_skb - process receive buffer from network
2208 * @skb: buffer to process
2210 * netif_receive_skb() is the main receive data processing function.
2211 * It always succeeds. The buffer may be dropped during processing
2212 * for congestion control or by the protocol layers.
2214 * This function may only be called from softirq context and interrupts
2215 * should be enabled.
2217 * Return values (usually ignored):
2218 * NET_RX_SUCCESS: no congestion
2219 * NET_RX_DROP: packet was dropped
2221 int netif_receive_skb(struct sk_buff *skb)
2223 struct packet_type *ptype, *pt_prev;
2224 struct net_device *orig_dev;
2225 struct net_device *null_or_orig;
2226 int ret = NET_RX_DROP;
2229 if (skb->vlan_tci && vlan_hwaccel_do_receive(skb))
2230 return NET_RX_SUCCESS;
2232 /* if we've gotten here through NAPI, check netpoll */
2233 if (netpoll_receive_skb(skb))
2236 if (!skb->tstamp.tv64)
2240 skb->iif = skb->dev->ifindex;
2242 null_or_orig = NULL;
2243 orig_dev = skb->dev;
2244 if (orig_dev->master) {
2245 if (skb_bond_should_drop(skb))
2246 null_or_orig = orig_dev; /* deliver only exact match */
2248 skb->dev = orig_dev->master;
2251 __get_cpu_var(netdev_rx_stat).total++;
2253 skb_reset_network_header(skb);
2254 skb_reset_transport_header(skb);
2255 skb->mac_len = skb->network_header - skb->mac_header;
2261 /* Don't receive packets in an exiting network namespace */
2262 if (!net_alive(dev_net(skb->dev))) {
2267 #ifdef CONFIG_NET_CLS_ACT
2268 if (skb->tc_verd & TC_NCLS) {
2269 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2274 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2275 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2276 ptype->dev == orig_dev) {
2278 ret = deliver_skb(skb, pt_prev, orig_dev);
2283 #ifdef CONFIG_NET_CLS_ACT
2284 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2290 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2293 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2297 type = skb->protocol;
2298 list_for_each_entry_rcu(ptype,
2299 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2300 if (ptype->type == type &&
2301 (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2302 ptype->dev == orig_dev)) {
2304 ret = deliver_skb(skb, pt_prev, orig_dev);
2310 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2313 /* Jamal, now you will not able to escape explaining
2314 * me how you were going to use this. :-)
2324 /* Network device is going away, flush any packets still pending */
2325 static void flush_backlog(void *arg)
2327 struct net_device *dev = arg;
2328 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2329 struct sk_buff *skb, *tmp;
2331 skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp)
2332 if (skb->dev == dev) {
2333 __skb_unlink(skb, &queue->input_pkt_queue);
2338 static int process_backlog(struct napi_struct *napi, int quota)
2341 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2342 unsigned long start_time = jiffies;
2344 napi->weight = weight_p;
2346 struct sk_buff *skb;
2348 local_irq_disable();
2349 skb = __skb_dequeue(&queue->input_pkt_queue);
2351 __napi_complete(napi);
2357 netif_receive_skb(skb);
2358 } while (++work < quota && jiffies == start_time);
2364 * __napi_schedule - schedule for receive
2365 * @n: entry to schedule
2367 * The entry's receive function will be scheduled to run
2369 void __napi_schedule(struct napi_struct *n)
2371 unsigned long flags;
2373 local_irq_save(flags);
2374 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2375 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2376 local_irq_restore(flags);
2378 EXPORT_SYMBOL(__napi_schedule);
2381 static void net_rx_action(struct softirq_action *h)
2383 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2384 unsigned long time_limit = jiffies + 2;
2385 int budget = netdev_budget;
2388 local_irq_disable();
2390 while (!list_empty(list)) {
2391 struct napi_struct *n;
2394 /* If softirq window is exhuasted then punt.
2395 * Allow this to run for 2 jiffies since which will allow
2396 * an average latency of 1.5/HZ.
2398 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
2403 /* Even though interrupts have been re-enabled, this
2404 * access is safe because interrupts can only add new
2405 * entries to the tail of this list, and only ->poll()
2406 * calls can remove this head entry from the list.
2408 n = list_entry(list->next, struct napi_struct, poll_list);
2410 have = netpoll_poll_lock(n);
2414 /* This NAPI_STATE_SCHED test is for avoiding a race
2415 * with netpoll's poll_napi(). Only the entity which
2416 * obtains the lock and sees NAPI_STATE_SCHED set will
2417 * actually make the ->poll() call. Therefore we avoid
2418 * accidently calling ->poll() when NAPI is not scheduled.
2421 if (test_bit(NAPI_STATE_SCHED, &n->state))
2422 work = n->poll(n, weight);
2424 WARN_ON_ONCE(work > weight);
2428 local_irq_disable();
2430 /* Drivers must not modify the NAPI state if they
2431 * consume the entire weight. In such cases this code
2432 * still "owns" the NAPI instance and therefore can
2433 * move the instance around on the list at-will.
2435 if (unlikely(work == weight)) {
2436 if (unlikely(napi_disable_pending(n)))
2439 list_move_tail(&n->poll_list, list);
2442 netpoll_poll_unlock(have);
2447 #ifdef CONFIG_NET_DMA
2449 * There may not be any more sk_buffs coming right now, so push
2450 * any pending DMA copies to hardware
2452 if (!cpus_empty(net_dma.channel_mask)) {
2454 for_each_cpu_mask_nr(chan_idx, net_dma.channel_mask) {
2455 struct dma_chan *chan = net_dma.channels[chan_idx];
2457 dma_async_memcpy_issue_pending(chan);
2465 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2466 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2470 static gifconf_func_t * gifconf_list [NPROTO];
2473 * register_gifconf - register a SIOCGIF handler
2474 * @family: Address family
2475 * @gifconf: Function handler
2477 * Register protocol dependent address dumping routines. The handler
2478 * that is passed must not be freed or reused until it has been replaced
2479 * by another handler.
2481 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2483 if (family >= NPROTO)
2485 gifconf_list[family] = gifconf;
2491 * Map an interface index to its name (SIOCGIFNAME)
2495 * We need this ioctl for efficient implementation of the
2496 * if_indextoname() function required by the IPv6 API. Without
2497 * it, we would have to search all the interfaces to find a
2501 static int dev_ifname(struct net *net, struct ifreq __user *arg)
2503 struct net_device *dev;
2507 * Fetch the caller's info block.
2510 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2513 read_lock(&dev_base_lock);
2514 dev = __dev_get_by_index(net, ifr.ifr_ifindex);
2516 read_unlock(&dev_base_lock);
2520 strcpy(ifr.ifr_name, dev->name);
2521 read_unlock(&dev_base_lock);
2523 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2529 * Perform a SIOCGIFCONF call. This structure will change
2530 * size eventually, and there is nothing I can do about it.
2531 * Thus we will need a 'compatibility mode'.
2534 static int dev_ifconf(struct net *net, char __user *arg)
2537 struct net_device *dev;
2544 * Fetch the caller's info block.
2547 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2554 * Loop over the interfaces, and write an info block for each.
2558 for_each_netdev(net, dev) {
2559 for (i = 0; i < NPROTO; i++) {
2560 if (gifconf_list[i]) {
2563 done = gifconf_list[i](dev, NULL, 0);
2565 done = gifconf_list[i](dev, pos + total,
2575 * All done. Write the updated control block back to the caller.
2577 ifc.ifc_len = total;
2580 * Both BSD and Solaris return 0 here, so we do too.
2582 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2585 #ifdef CONFIG_PROC_FS
2587 * This is invoked by the /proc filesystem handler to display a device
2590 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2591 __acquires(dev_base_lock)
2593 struct net *net = seq_file_net(seq);
2595 struct net_device *dev;
2597 read_lock(&dev_base_lock);
2599 return SEQ_START_TOKEN;
2602 for_each_netdev(net, dev)
2609 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2611 struct net *net = seq_file_net(seq);
2613 return v == SEQ_START_TOKEN ?
2614 first_net_device(net) : next_net_device((struct net_device *)v);
2617 void dev_seq_stop(struct seq_file *seq, void *v)
2618 __releases(dev_base_lock)
2620 read_unlock(&dev_base_lock);
2623 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2625 const struct net_device_stats *stats = dev_get_stats(dev);
2627 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2628 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2629 dev->name, stats->rx_bytes, stats->rx_packets,
2631 stats->rx_dropped + stats->rx_missed_errors,
2632 stats->rx_fifo_errors,
2633 stats->rx_length_errors + stats->rx_over_errors +
2634 stats->rx_crc_errors + stats->rx_frame_errors,
2635 stats->rx_compressed, stats->multicast,
2636 stats->tx_bytes, stats->tx_packets,
2637 stats->tx_errors, stats->tx_dropped,
2638 stats->tx_fifo_errors, stats->collisions,
2639 stats->tx_carrier_errors +
2640 stats->tx_aborted_errors +
2641 stats->tx_window_errors +
2642 stats->tx_heartbeat_errors,
2643 stats->tx_compressed);
2647 * Called from the PROCfs module. This now uses the new arbitrary sized
2648 * /proc/net interface to create /proc/net/dev
2650 static int dev_seq_show(struct seq_file *seq, void *v)
2652 if (v == SEQ_START_TOKEN)
2653 seq_puts(seq, "Inter-| Receive "
2655 " face |bytes packets errs drop fifo frame "
2656 "compressed multicast|bytes packets errs "
2657 "drop fifo colls carrier compressed\n");
2659 dev_seq_printf_stats(seq, v);
2663 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2665 struct netif_rx_stats *rc = NULL;
2667 while (*pos < nr_cpu_ids)
2668 if (cpu_online(*pos)) {
2669 rc = &per_cpu(netdev_rx_stat, *pos);
2676 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2678 return softnet_get_online(pos);
2681 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2684 return softnet_get_online(pos);
2687 static void softnet_seq_stop(struct seq_file *seq, void *v)
2691 static int softnet_seq_show(struct seq_file *seq, void *v)
2693 struct netif_rx_stats *s = v;
2695 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2696 s->total, s->dropped, s->time_squeeze, 0,
2697 0, 0, 0, 0, /* was fastroute */
2702 static const struct seq_operations dev_seq_ops = {
2703 .start = dev_seq_start,
2704 .next = dev_seq_next,
2705 .stop = dev_seq_stop,
2706 .show = dev_seq_show,
2709 static int dev_seq_open(struct inode *inode, struct file *file)
2711 return seq_open_net(inode, file, &dev_seq_ops,
2712 sizeof(struct seq_net_private));
2715 static const struct file_operations dev_seq_fops = {
2716 .owner = THIS_MODULE,
2717 .open = dev_seq_open,
2719 .llseek = seq_lseek,
2720 .release = seq_release_net,
2723 static const struct seq_operations softnet_seq_ops = {
2724 .start = softnet_seq_start,
2725 .next = softnet_seq_next,
2726 .stop = softnet_seq_stop,
2727 .show = softnet_seq_show,
2730 static int softnet_seq_open(struct inode *inode, struct file *file)
2732 return seq_open(file, &softnet_seq_ops);
2735 static const struct file_operations softnet_seq_fops = {
2736 .owner = THIS_MODULE,
2737 .open = softnet_seq_open,
2739 .llseek = seq_lseek,
2740 .release = seq_release,
2743 static void *ptype_get_idx(loff_t pos)
2745 struct packet_type *pt = NULL;
2749 list_for_each_entry_rcu(pt, &ptype_all, list) {
2755 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
2756 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
2765 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
2769 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
2772 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2774 struct packet_type *pt;
2775 struct list_head *nxt;
2779 if (v == SEQ_START_TOKEN)
2780 return ptype_get_idx(0);
2783 nxt = pt->list.next;
2784 if (pt->type == htons(ETH_P_ALL)) {
2785 if (nxt != &ptype_all)
2788 nxt = ptype_base[0].next;
2790 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
2792 while (nxt == &ptype_base[hash]) {
2793 if (++hash >= PTYPE_HASH_SIZE)
2795 nxt = ptype_base[hash].next;
2798 return list_entry(nxt, struct packet_type, list);
2801 static void ptype_seq_stop(struct seq_file *seq, void *v)
2807 static int ptype_seq_show(struct seq_file *seq, void *v)
2809 struct packet_type *pt = v;
2811 if (v == SEQ_START_TOKEN)
2812 seq_puts(seq, "Type Device Function\n");
2813 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
2814 if (pt->type == htons(ETH_P_ALL))
2815 seq_puts(seq, "ALL ");
2817 seq_printf(seq, "%04x", ntohs(pt->type));
2819 seq_printf(seq, " %-8s %pF\n",
2820 pt->dev ? pt->dev->name : "", pt->func);
2826 static const struct seq_operations ptype_seq_ops = {
2827 .start = ptype_seq_start,
2828 .next = ptype_seq_next,
2829 .stop = ptype_seq_stop,
2830 .show = ptype_seq_show,
2833 static int ptype_seq_open(struct inode *inode, struct file *file)
2835 return seq_open_net(inode, file, &ptype_seq_ops,
2836 sizeof(struct seq_net_private));
2839 static const struct file_operations ptype_seq_fops = {
2840 .owner = THIS_MODULE,
2841 .open = ptype_seq_open,
2843 .llseek = seq_lseek,
2844 .release = seq_release_net,
2848 static int __net_init dev_proc_net_init(struct net *net)
2852 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
2854 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
2856 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
2859 if (wext_proc_init(net))
2865 proc_net_remove(net, "ptype");
2867 proc_net_remove(net, "softnet_stat");
2869 proc_net_remove(net, "dev");
2873 static void __net_exit dev_proc_net_exit(struct net *net)
2875 wext_proc_exit(net);
2877 proc_net_remove(net, "ptype");
2878 proc_net_remove(net, "softnet_stat");
2879 proc_net_remove(net, "dev");
2882 static struct pernet_operations __net_initdata dev_proc_ops = {
2883 .init = dev_proc_net_init,
2884 .exit = dev_proc_net_exit,
2887 static int __init dev_proc_init(void)
2889 return register_pernet_subsys(&dev_proc_ops);
2892 #define dev_proc_init() 0
2893 #endif /* CONFIG_PROC_FS */
2897 * netdev_set_master - set up master/slave pair
2898 * @slave: slave device
2899 * @master: new master device
2901 * Changes the master device of the slave. Pass %NULL to break the
2902 * bonding. The caller must hold the RTNL semaphore. On a failure
2903 * a negative errno code is returned. On success the reference counts
2904 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2905 * function returns zero.
2907 int netdev_set_master(struct net_device *slave, struct net_device *master)
2909 struct net_device *old = slave->master;
2919 slave->master = master;
2927 slave->flags |= IFF_SLAVE;
2929 slave->flags &= ~IFF_SLAVE;
2931 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2935 static void dev_change_rx_flags(struct net_device *dev, int flags)
2937 const struct net_device_ops *ops = dev->netdev_ops;
2939 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
2940 ops->ndo_change_rx_flags(dev, flags);
2943 static int __dev_set_promiscuity(struct net_device *dev, int inc)
2945 unsigned short old_flags = dev->flags;
2949 dev->flags |= IFF_PROMISC;
2950 dev->promiscuity += inc;
2951 if (dev->promiscuity == 0) {
2954 * If inc causes overflow, untouch promisc and return error.
2957 dev->flags &= ~IFF_PROMISC;
2959 dev->promiscuity -= inc;
2960 printk(KERN_WARNING "%s: promiscuity touches roof, "
2961 "set promiscuity failed, promiscuity feature "
2962 "of device might be broken.\n", dev->name);
2966 if (dev->flags != old_flags) {
2967 printk(KERN_INFO "device %s %s promiscuous mode\n",
2968 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2971 audit_log(current->audit_context, GFP_ATOMIC,
2972 AUDIT_ANOM_PROMISCUOUS,
2973 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
2974 dev->name, (dev->flags & IFF_PROMISC),
2975 (old_flags & IFF_PROMISC),
2976 audit_get_loginuid(current),
2977 current->uid, current->gid,
2978 audit_get_sessionid(current));
2980 dev_change_rx_flags(dev, IFF_PROMISC);
2986 * dev_set_promiscuity - update promiscuity count on a device
2990 * Add or remove promiscuity from a device. While the count in the device
2991 * remains above zero the interface remains promiscuous. Once it hits zero
2992 * the device reverts back to normal filtering operation. A negative inc
2993 * value is used to drop promiscuity on the device.
2994 * Return 0 if successful or a negative errno code on error.
2996 int dev_set_promiscuity(struct net_device *dev, int inc)
2998 unsigned short old_flags = dev->flags;
3001 err = __dev_set_promiscuity(dev, inc);
3004 if (dev->flags != old_flags)
3005 dev_set_rx_mode(dev);
3010 * dev_set_allmulti - update allmulti count on a device
3014 * Add or remove reception of all multicast frames to a device. While the
3015 * count in the device remains above zero the interface remains listening
3016 * to all interfaces. Once it hits zero the device reverts back to normal
3017 * filtering operation. A negative @inc value is used to drop the counter
3018 * when releasing a resource needing all multicasts.
3019 * Return 0 if successful or a negative errno code on error.
3022 int dev_set_allmulti(struct net_device *dev, int inc)
3024 unsigned short old_flags = dev->flags;
3028 dev->flags |= IFF_ALLMULTI;
3029 dev->allmulti += inc;
3030 if (dev->allmulti == 0) {
3033 * If inc causes overflow, untouch allmulti and return error.
3036 dev->flags &= ~IFF_ALLMULTI;
3038 dev->allmulti -= inc;
3039 printk(KERN_WARNING "%s: allmulti touches roof, "
3040 "set allmulti failed, allmulti feature of "
3041 "device might be broken.\n", dev->name);
3045 if (dev->flags ^ old_flags) {
3046 dev_change_rx_flags(dev, IFF_ALLMULTI);
3047 dev_set_rx_mode(dev);
3053 * Upload unicast and multicast address lists to device and
3054 * configure RX filtering. When the device doesn't support unicast
3055 * filtering it is put in promiscuous mode while unicast addresses
3058 void __dev_set_rx_mode(struct net_device *dev)
3060 const struct net_device_ops *ops = dev->netdev_ops;
3062 /* dev_open will call this function so the list will stay sane. */
3063 if (!(dev->flags&IFF_UP))
3066 if (!netif_device_present(dev))
3069 if (ops->ndo_set_rx_mode)
3070 ops->ndo_set_rx_mode(dev);
3072 /* Unicast addresses changes may only happen under the rtnl,
3073 * therefore calling __dev_set_promiscuity here is safe.
3075 if (dev->uc_count > 0 && !dev->uc_promisc) {
3076 __dev_set_promiscuity(dev, 1);
3077 dev->uc_promisc = 1;
3078 } else if (dev->uc_count == 0 && dev->uc_promisc) {
3079 __dev_set_promiscuity(dev, -1);
3080 dev->uc_promisc = 0;
3083 if (ops->ndo_set_multicast_list)
3084 ops->ndo_set_multicast_list(dev);
3088 void dev_set_rx_mode(struct net_device *dev)
3090 netif_addr_lock_bh(dev);
3091 __dev_set_rx_mode(dev);
3092 netif_addr_unlock_bh(dev);
3095 int __dev_addr_delete(struct dev_addr_list **list, int *count,
3096 void *addr, int alen, int glbl)
3098 struct dev_addr_list *da;
3100 for (; (da = *list) != NULL; list = &da->next) {
3101 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3102 alen == da->da_addrlen) {
3104 int old_glbl = da->da_gusers;
3121 int __dev_addr_add(struct dev_addr_list **list, int *count,
3122 void *addr, int alen, int glbl)
3124 struct dev_addr_list *da;
3126 for (da = *list; da != NULL; da = da->next) {
3127 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3128 da->da_addrlen == alen) {
3130 int old_glbl = da->da_gusers;
3140 da = kzalloc(sizeof(*da), GFP_ATOMIC);
3143 memcpy(da->da_addr, addr, alen);
3144 da->da_addrlen = alen;
3146 da->da_gusers = glbl ? 1 : 0;
3154 * dev_unicast_delete - Release secondary unicast address.
3156 * @addr: address to delete
3157 * @alen: length of @addr
3159 * Release reference to a secondary unicast address and remove it
3160 * from the device if the reference count drops to zero.
3162 * The caller must hold the rtnl_mutex.
3164 int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
3170 netif_addr_lock_bh(dev);
3171 err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3173 __dev_set_rx_mode(dev);
3174 netif_addr_unlock_bh(dev);
3177 EXPORT_SYMBOL(dev_unicast_delete);
3180 * dev_unicast_add - add a secondary unicast address
3182 * @addr: address to add
3183 * @alen: length of @addr
3185 * Add a secondary unicast address to the device or increase
3186 * the reference count if it already exists.
3188 * The caller must hold the rtnl_mutex.
3190 int dev_unicast_add(struct net_device *dev, void *addr, int alen)
3196 netif_addr_lock_bh(dev);
3197 err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3199 __dev_set_rx_mode(dev);
3200 netif_addr_unlock_bh(dev);
3203 EXPORT_SYMBOL(dev_unicast_add);
3205 int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
3206 struct dev_addr_list **from, int *from_count)
3208 struct dev_addr_list *da, *next;
3212 while (da != NULL) {
3214 if (!da->da_synced) {
3215 err = __dev_addr_add(to, to_count,
3216 da->da_addr, da->da_addrlen, 0);
3221 } else if (da->da_users == 1) {
3222 __dev_addr_delete(to, to_count,
3223 da->da_addr, da->da_addrlen, 0);
3224 __dev_addr_delete(from, from_count,
3225 da->da_addr, da->da_addrlen, 0);
3232 void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
3233 struct dev_addr_list **from, int *from_count)
3235 struct dev_addr_list *da, *next;
3238 while (da != NULL) {
3240 if (da->da_synced) {
3241 __dev_addr_delete(to, to_count,
3242 da->da_addr, da->da_addrlen, 0);
3244 __dev_addr_delete(from, from_count,
3245 da->da_addr, da->da_addrlen, 0);
3252 * dev_unicast_sync - Synchronize device's unicast list to another device
3253 * @to: destination device
3254 * @from: source device
3256 * Add newly added addresses to the destination device and release
3257 * addresses that have no users left. The source device must be
3258 * locked by netif_tx_lock_bh.
3260 * This function is intended to be called from the dev->set_rx_mode
3261 * function of layered software devices.
3263 int dev_unicast_sync(struct net_device *to, struct net_device *from)
3267 netif_addr_lock_bh(to);
3268 err = __dev_addr_sync(&to->uc_list, &to->uc_count,
3269 &from->uc_list, &from->uc_count);
3271 __dev_set_rx_mode(to);
3272 netif_addr_unlock_bh(to);
3275 EXPORT_SYMBOL(dev_unicast_sync);
3278 * dev_unicast_unsync - Remove synchronized addresses from the destination device
3279 * @to: destination device
3280 * @from: source device
3282 * Remove all addresses that were added to the destination device by
3283 * dev_unicast_sync(). This function is intended to be called from the
3284 * dev->stop function of layered software devices.
3286 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
3288 netif_addr_lock_bh(from);
3289 netif_addr_lock(to);
3291 __dev_addr_unsync(&to->uc_list, &to->uc_count,
3292 &from->uc_list, &from->uc_count);
3293 __dev_set_rx_mode(to);
3295 netif_addr_unlock(to);
3296 netif_addr_unlock_bh(from);
3298 EXPORT_SYMBOL(dev_unicast_unsync);
3300 static void __dev_addr_discard(struct dev_addr_list **list)
3302 struct dev_addr_list *tmp;
3304 while (*list != NULL) {
3307 if (tmp->da_users > tmp->da_gusers)
3308 printk("__dev_addr_discard: address leakage! "
3309 "da_users=%d\n", tmp->da_users);
3314 static void dev_addr_discard(struct net_device *dev)
3316 netif_addr_lock_bh(dev);
3318 __dev_addr_discard(&dev->uc_list);
3321 __dev_addr_discard(&dev->mc_list);
3324 netif_addr_unlock_bh(dev);
3328 * dev_get_flags - get flags reported to userspace
3331 * Get the combination of flag bits exported through APIs to userspace.
3333 unsigned dev_get_flags(const struct net_device *dev)
3337 flags = (dev->flags & ~(IFF_PROMISC |
3342 (dev->gflags & (IFF_PROMISC |
3345 if (netif_running(dev)) {
3346 if (netif_oper_up(dev))
3347 flags |= IFF_RUNNING;
3348 if (netif_carrier_ok(dev))
3349 flags |= IFF_LOWER_UP;
3350 if (netif_dormant(dev))
3351 flags |= IFF_DORMANT;
3358 * dev_change_flags - change device settings
3360 * @flags: device state flags
3362 * Change settings on device based state flags. The flags are
3363 * in the userspace exported format.
3365 int dev_change_flags(struct net_device *dev, unsigned flags)
3368 int old_flags = dev->flags;
3373 * Set the flags on our device.
3376 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
3377 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
3379 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
3383 * Load in the correct multicast list now the flags have changed.
3386 if ((old_flags ^ flags) & IFF_MULTICAST)
3387 dev_change_rx_flags(dev, IFF_MULTICAST);
3389 dev_set_rx_mode(dev);
3392 * Have we downed the interface. We handle IFF_UP ourselves
3393 * according to user attempts to set it, rather than blindly
3398 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
3399 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
3402 dev_set_rx_mode(dev);
3405 if (dev->flags & IFF_UP &&
3406 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
3408 call_netdevice_notifiers(NETDEV_CHANGE, dev);
3410 if ((flags ^ dev->gflags) & IFF_PROMISC) {
3411 int inc = (flags & IFF_PROMISC) ? +1 : -1;
3412 dev->gflags ^= IFF_PROMISC;
3413 dev_set_promiscuity(dev, inc);
3416 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
3417 is important. Some (broken) drivers set IFF_PROMISC, when
3418 IFF_ALLMULTI is requested not asking us and not reporting.
3420 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
3421 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
3422 dev->gflags ^= IFF_ALLMULTI;
3423 dev_set_allmulti(dev, inc);
3426 /* Exclude state transition flags, already notified */
3427 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
3429 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
3435 * dev_set_mtu - Change maximum transfer unit
3437 * @new_mtu: new transfer unit
3439 * Change the maximum transfer size of the network device.
3441 int dev_set_mtu(struct net_device *dev, int new_mtu)
3443 const struct net_device_ops *ops = dev->netdev_ops;
3446 if (new_mtu == dev->mtu)
3449 /* MTU must be positive. */
3453 if (!netif_device_present(dev))
3457 if (ops->ndo_change_mtu)
3458 err = ops->ndo_change_mtu(dev, new_mtu);
3462 if (!err && dev->flags & IFF_UP)
3463 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
3468 * dev_set_mac_address - Change Media Access Control Address
3472 * Change the hardware (MAC) address of the device
3474 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
3476 const struct net_device_ops *ops = dev->netdev_ops;
3479 if (!ops->ndo_set_mac_address)
3481 if (sa->sa_family != dev->type)
3483 if (!netif_device_present(dev))
3485 err = ops->ndo_set_mac_address(dev, sa);
3487 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3492 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
3494 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
3497 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3503 case SIOCGIFFLAGS: /* Get interface flags */
3504 ifr->ifr_flags = dev_get_flags(dev);
3507 case SIOCGIFMETRIC: /* Get the metric on the interface
3508 (currently unused) */
3509 ifr->ifr_metric = 0;
3512 case SIOCGIFMTU: /* Get the MTU of a device */
3513 ifr->ifr_mtu = dev->mtu;
3518 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
3520 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
3521 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3522 ifr->ifr_hwaddr.sa_family = dev->type;
3530 ifr->ifr_map.mem_start = dev->mem_start;
3531 ifr->ifr_map.mem_end = dev->mem_end;
3532 ifr->ifr_map.base_addr = dev->base_addr;
3533 ifr->ifr_map.irq = dev->irq;
3534 ifr->ifr_map.dma = dev->dma;
3535 ifr->ifr_map.port = dev->if_port;
3539 ifr->ifr_ifindex = dev->ifindex;
3543 ifr->ifr_qlen = dev->tx_queue_len;
3547 /* dev_ioctl() should ensure this case
3559 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
3561 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
3564 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3565 const struct net_device_ops *ops = dev->netdev_ops;
3571 case SIOCSIFFLAGS: /* Set interface flags */
3572 return dev_change_flags(dev, ifr->ifr_flags);
3574 case SIOCSIFMETRIC: /* Set the metric on the interface
3575 (currently unused) */
3578 case SIOCSIFMTU: /* Set the MTU of a device */
3579 return dev_set_mtu(dev, ifr->ifr_mtu);
3582 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
3584 case SIOCSIFHWBROADCAST:
3585 if (ifr->ifr_hwaddr.sa_family != dev->type)
3587 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
3588 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3589 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3593 if (ops->ndo_set_config) {
3594 if (!netif_device_present(dev))
3596 return ops->ndo_set_config(dev, &ifr->ifr_map);
3601 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
3602 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3604 if (!netif_device_present(dev))
3606 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
3610 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
3611 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3613 if (!netif_device_present(dev))
3615 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
3619 if (ifr->ifr_qlen < 0)
3621 dev->tx_queue_len = ifr->ifr_qlen;
3625 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
3626 return dev_change_name(dev, ifr->ifr_newname);
3629 * Unknown or private ioctl
3633 if ((cmd >= SIOCDEVPRIVATE &&
3634 cmd <= SIOCDEVPRIVATE + 15) ||
3635 cmd == SIOCBONDENSLAVE ||
3636 cmd == SIOCBONDRELEASE ||
3637 cmd == SIOCBONDSETHWADDR ||
3638 cmd == SIOCBONDSLAVEINFOQUERY ||
3639 cmd == SIOCBONDINFOQUERY ||
3640 cmd == SIOCBONDCHANGEACTIVE ||
3641 cmd == SIOCGMIIPHY ||
3642 cmd == SIOCGMIIREG ||
3643 cmd == SIOCSMIIREG ||
3644 cmd == SIOCBRADDIF ||
3645 cmd == SIOCBRDELIF ||
3646 cmd == SIOCWANDEV) {
3648 if (ops->ndo_do_ioctl) {
3649 if (netif_device_present(dev))
3650 err = ops->ndo_do_ioctl(dev, ifr, cmd);
3662 * This function handles all "interface"-type I/O control requests. The actual
3663 * 'doing' part of this is dev_ifsioc above.
3667 * dev_ioctl - network device ioctl
3668 * @net: the applicable net namespace
3669 * @cmd: command to issue
3670 * @arg: pointer to a struct ifreq in user space
3672 * Issue ioctl functions to devices. This is normally called by the
3673 * user space syscall interfaces but can sometimes be useful for
3674 * other purposes. The return value is the return from the syscall if
3675 * positive or a negative errno code on error.
3678 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
3684 /* One special case: SIOCGIFCONF takes ifconf argument
3685 and requires shared lock, because it sleeps writing
3689 if (cmd == SIOCGIFCONF) {
3691 ret = dev_ifconf(net, (char __user *) arg);
3695 if (cmd == SIOCGIFNAME)
3696 return dev_ifname(net, (struct ifreq __user *)arg);
3698 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3701 ifr.ifr_name[IFNAMSIZ-1] = 0;
3703 colon = strchr(ifr.ifr_name, ':');
3708 * See which interface the caller is talking about.
3713 * These ioctl calls:
3714 * - can be done by all.
3715 * - atomic and do not require locking.
3726 dev_load(net, ifr.ifr_name);
3727 read_lock(&dev_base_lock);
3728 ret = dev_ifsioc_locked(net, &ifr, cmd);
3729 read_unlock(&dev_base_lock);
3733 if (copy_to_user(arg, &ifr,
3734 sizeof(struct ifreq)))
3740 dev_load(net, ifr.ifr_name);
3742 ret = dev_ethtool(net, &ifr);
3747 if (copy_to_user(arg, &ifr,
3748 sizeof(struct ifreq)))
3754 * These ioctl calls:
3755 * - require superuser power.
3756 * - require strict serialization.
3762 if (!capable(CAP_NET_ADMIN))
3764 dev_load(net, ifr.ifr_name);
3766 ret = dev_ifsioc(net, &ifr, cmd);
3771 if (copy_to_user(arg, &ifr,
3772 sizeof(struct ifreq)))
3778 * These ioctl calls:
3779 * - require superuser power.
3780 * - require strict serialization.
3781 * - do not return a value
3791 case SIOCSIFHWBROADCAST:
3794 case SIOCBONDENSLAVE:
3795 case SIOCBONDRELEASE:
3796 case SIOCBONDSETHWADDR:
3797 case SIOCBONDCHANGEACTIVE:
3800 if (!capable(CAP_NET_ADMIN))
3803 case SIOCBONDSLAVEINFOQUERY:
3804 case SIOCBONDINFOQUERY:
3805 dev_load(net, ifr.ifr_name);
3807 ret = dev_ifsioc(net, &ifr, cmd);
3812 /* Get the per device memory space. We can add this but
3813 * currently do not support it */
3815 /* Set the per device memory buffer space.
3816 * Not applicable in our case */
3821 * Unknown or private ioctl.
3824 if (cmd == SIOCWANDEV ||
3825 (cmd >= SIOCDEVPRIVATE &&
3826 cmd <= SIOCDEVPRIVATE + 15)) {
3827 dev_load(net, ifr.ifr_name);
3829 ret = dev_ifsioc(net, &ifr, cmd);
3831 if (!ret && copy_to_user(arg, &ifr,
3832 sizeof(struct ifreq)))
3836 /* Take care of Wireless Extensions */
3837 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
3838 return wext_handle_ioctl(net, &ifr, cmd, arg);
3845 * dev_new_index - allocate an ifindex
3846 * @net: the applicable net namespace
3848 * Returns a suitable unique value for a new device interface
3849 * number. The caller must hold the rtnl semaphore or the
3850 * dev_base_lock to be sure it remains unique.
3852 static int dev_new_index(struct net *net)
3858 if (!__dev_get_by_index(net, ifindex))
3863 /* Delayed registration/unregisteration */
3864 static LIST_HEAD(net_todo_list);
3866 static void net_set_todo(struct net_device *dev)
3868 list_add_tail(&dev->todo_list, &net_todo_list);
3871 static void rollback_registered(struct net_device *dev)
3873 BUG_ON(dev_boot_phase);
3876 /* Some devices call without registering for initialization unwind. */
3877 if (dev->reg_state == NETREG_UNINITIALIZED) {
3878 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3879 "was registered\n", dev->name, dev);
3885 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3887 /* If device is running, close it first. */
3890 /* And unlink it from device chain. */
3891 unlist_netdevice(dev);
3893 dev->reg_state = NETREG_UNREGISTERING;
3897 /* Shutdown queueing discipline. */
3901 /* Notify protocols, that we are about to destroy
3902 this device. They should clean all the things.
3904 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
3907 * Flush the unicast and multicast chains
3909 dev_addr_discard(dev);
3911 if (dev->netdev_ops->ndo_uninit)
3912 dev->netdev_ops->ndo_uninit(dev);
3914 /* Notifier chain MUST detach us from master device. */
3915 WARN_ON(dev->master);
3917 /* Remove entries from kobject tree */
3918 netdev_unregister_kobject(dev);
3925 static void __netdev_init_queue_locks_one(struct net_device *dev,
3926 struct netdev_queue *dev_queue,
3929 spin_lock_init(&dev_queue->_xmit_lock);
3930 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
3931 dev_queue->xmit_lock_owner = -1;
3934 static void netdev_init_queue_locks(struct net_device *dev)
3936 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
3937 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
3940 unsigned long netdev_fix_features(unsigned long features, const char *name)
3942 /* Fix illegal SG+CSUM combinations. */
3943 if ((features & NETIF_F_SG) &&
3944 !(features & NETIF_F_ALL_CSUM)) {
3946 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
3947 "checksum feature.\n", name);
3948 features &= ~NETIF_F_SG;
3951 /* TSO requires that SG is present as well. */
3952 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
3954 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
3955 "SG feature.\n", name);
3956 features &= ~NETIF_F_TSO;
3959 if (features & NETIF_F_UFO) {
3960 if (!(features & NETIF_F_GEN_CSUM)) {
3962 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
3963 "since no NETIF_F_HW_CSUM feature.\n",
3965 features &= ~NETIF_F_UFO;
3968 if (!(features & NETIF_F_SG)) {
3970 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
3971 "since no NETIF_F_SG feature.\n", name);
3972 features &= ~NETIF_F_UFO;
3978 EXPORT_SYMBOL(netdev_fix_features);
3981 * register_netdevice - register a network device
3982 * @dev: device to register
3984 * Take a completed network device structure and add it to the kernel
3985 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3986 * chain. 0 is returned on success. A negative errno code is returned
3987 * on a failure to set up the device, or if the name is a duplicate.
3989 * Callers must hold the rtnl semaphore. You may want
3990 * register_netdev() instead of this.
3993 * The locking appears insufficient to guarantee two parallel registers
3994 * will not get the same name.
3997 int register_netdevice(struct net_device *dev)
3999 struct hlist_head *head;
4000 struct hlist_node *p;
4002 struct net *net = dev_net(dev);
4004 BUG_ON(dev_boot_phase);
4009 /* When net_device's are persistent, this will be fatal. */
4010 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4013 spin_lock_init(&dev->addr_list_lock);
4014 netdev_set_addr_lockdep_class(dev);
4015 netdev_init_queue_locks(dev);
4019 #ifdef CONFIG_COMPAT_NET_DEV_OPS
4020 /* Netdevice_ops API compatiability support.
4021 * This is temporary until all network devices are converted.
4023 if (dev->netdev_ops) {
4024 const struct net_device_ops *ops = dev->netdev_ops;
4026 dev->init = ops->ndo_init;
4027 dev->uninit = ops->ndo_uninit;
4028 dev->open = ops->ndo_open;
4029 dev->change_rx_flags = ops->ndo_change_rx_flags;
4030 dev->set_rx_mode = ops->ndo_set_rx_mode;
4031 dev->set_multicast_list = ops->ndo_set_multicast_list;
4032 dev->set_mac_address = ops->ndo_set_mac_address;
4033 dev->validate_addr = ops->ndo_validate_addr;
4034 dev->do_ioctl = ops->ndo_do_ioctl;
4035 dev->set_config = ops->ndo_set_config;
4036 dev->change_mtu = ops->ndo_change_mtu;
4037 dev->tx_timeout = ops->ndo_tx_timeout;
4038 dev->get_stats = ops->ndo_get_stats;
4039 dev->vlan_rx_register = ops->ndo_vlan_rx_register;
4040 dev->vlan_rx_add_vid = ops->ndo_vlan_rx_add_vid;
4041 dev->vlan_rx_kill_vid = ops->ndo_vlan_rx_kill_vid;
4042 #ifdef CONFIG_NET_POLL_CONTROLLER
4043 dev->poll_controller = ops->ndo_poll_controller;
4046 char drivername[64];
4047 pr_info("%s (%s): not using net_device_ops yet\n",
4048 dev->name, netdev_drivername(dev, drivername, 64));
4050 /* This works only because net_device_ops and the
4051 compatiablity structure are the same. */
4052 dev->netdev_ops = (void *) &(dev->init);
4056 /* Init, if this function is available */
4057 if (dev->netdev_ops->ndo_init) {
4058 ret = dev->netdev_ops->ndo_init(dev);
4066 if (!dev_valid_name(dev->name)) {
4071 dev->ifindex = dev_new_index(net);
4072 if (dev->iflink == -1)
4073 dev->iflink = dev->ifindex;
4075 /* Check for existence of name */
4076 head = dev_name_hash(net, dev->name);
4077 hlist_for_each(p, head) {
4078 struct net_device *d
4079 = hlist_entry(p, struct net_device, name_hlist);
4080 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
4086 /* Fix illegal checksum combinations */
4087 if ((dev->features & NETIF_F_HW_CSUM) &&
4088 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4089 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4091 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4094 if ((dev->features & NETIF_F_NO_CSUM) &&
4095 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4096 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4098 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4101 dev->features = netdev_fix_features(dev->features, dev->name);
4103 /* Enable software GSO if SG is supported. */
4104 if (dev->features & NETIF_F_SG)
4105 dev->features |= NETIF_F_GSO;
4107 netdev_initialize_kobject(dev);
4108 ret = netdev_register_kobject(dev);
4111 dev->reg_state = NETREG_REGISTERED;
4114 * Default initial state at registry is that the
4115 * device is present.
4118 set_bit(__LINK_STATE_PRESENT, &dev->state);
4120 dev_init_scheduler(dev);
4122 list_netdevice(dev);
4124 /* Notify protocols, that a new device appeared. */
4125 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4126 ret = notifier_to_errno(ret);
4128 rollback_registered(dev);
4129 dev->reg_state = NETREG_UNREGISTERED;
4136 if (dev->netdev_ops->ndo_uninit)
4137 dev->netdev_ops->ndo_uninit(dev);
4142 * register_netdev - register a network device
4143 * @dev: device to register
4145 * Take a completed network device structure and add it to the kernel
4146 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4147 * chain. 0 is returned on success. A negative errno code is returned
4148 * on a failure to set up the device, or if the name is a duplicate.
4150 * This is a wrapper around register_netdevice that takes the rtnl semaphore
4151 * and expands the device name if you passed a format string to
4154 int register_netdev(struct net_device *dev)
4161 * If the name is a format string the caller wants us to do a
4164 if (strchr(dev->name, '%')) {
4165 err = dev_alloc_name(dev, dev->name);
4170 err = register_netdevice(dev);
4175 EXPORT_SYMBOL(register_netdev);
4178 * netdev_wait_allrefs - wait until all references are gone.
4180 * This is called when unregistering network devices.
4182 * Any protocol or device that holds a reference should register
4183 * for netdevice notification, and cleanup and put back the
4184 * reference if they receive an UNREGISTER event.
4185 * We can get stuck here if buggy protocols don't correctly
4188 static void netdev_wait_allrefs(struct net_device *dev)
4190 unsigned long rebroadcast_time, warning_time;
4192 rebroadcast_time = warning_time = jiffies;
4193 while (atomic_read(&dev->refcnt) != 0) {
4194 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
4197 /* Rebroadcast unregister notification */
4198 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4200 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
4202 /* We must not have linkwatch events
4203 * pending on unregister. If this
4204 * happens, we simply run the queue
4205 * unscheduled, resulting in a noop
4208 linkwatch_run_queue();
4213 rebroadcast_time = jiffies;
4218 if (time_after(jiffies, warning_time + 10 * HZ)) {
4219 printk(KERN_EMERG "unregister_netdevice: "
4220 "waiting for %s to become free. Usage "
4222 dev->name, atomic_read(&dev->refcnt));
4223 warning_time = jiffies;
4232 * register_netdevice(x1);
4233 * register_netdevice(x2);
4235 * unregister_netdevice(y1);
4236 * unregister_netdevice(y2);
4242 * We are invoked by rtnl_unlock().
4243 * This allows us to deal with problems:
4244 * 1) We can delete sysfs objects which invoke hotplug
4245 * without deadlocking with linkwatch via keventd.
4246 * 2) Since we run with the RTNL semaphore not held, we can sleep
4247 * safely in order to wait for the netdev refcnt to drop to zero.
4249 * We must not return until all unregister events added during
4250 * the interval the lock was held have been completed.
4252 void netdev_run_todo(void)
4254 struct list_head list;
4256 /* Snapshot list, allow later requests */
4257 list_replace_init(&net_todo_list, &list);
4261 while (!list_empty(&list)) {
4262 struct net_device *dev
4263 = list_entry(list.next, struct net_device, todo_list);
4264 list_del(&dev->todo_list);
4266 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
4267 printk(KERN_ERR "network todo '%s' but state %d\n",
4268 dev->name, dev->reg_state);
4273 dev->reg_state = NETREG_UNREGISTERED;
4275 on_each_cpu(flush_backlog, dev, 1);
4277 netdev_wait_allrefs(dev);
4280 BUG_ON(atomic_read(&dev->refcnt));
4281 WARN_ON(dev->ip_ptr);
4282 WARN_ON(dev->ip6_ptr);
4283 WARN_ON(dev->dn_ptr);
4285 if (dev->destructor)
4286 dev->destructor(dev);
4288 /* Free network device */
4289 kobject_put(&dev->dev.kobj);
4294 * dev_get_stats - get network device statistics
4295 * @dev: device to get statistics from
4297 * Get network statistics from device. The device driver may provide
4298 * its own method by setting dev->netdev_ops->get_stats; otherwise
4299 * the internal statistics structure is used.
4301 const struct net_device_stats *dev_get_stats(struct net_device *dev)
4303 const struct net_device_ops *ops = dev->netdev_ops;
4305 if (ops->ndo_get_stats)
4306 return ops->ndo_get_stats(dev);
4310 EXPORT_SYMBOL(dev_get_stats);
4312 static void netdev_init_one_queue(struct net_device *dev,
4313 struct netdev_queue *queue,
4319 static void netdev_init_queues(struct net_device *dev)
4321 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
4322 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
4323 spin_lock_init(&dev->tx_global_lock);
4327 * alloc_netdev_mq - allocate network device
4328 * @sizeof_priv: size of private data to allocate space for
4329 * @name: device name format string
4330 * @setup: callback to initialize device
4331 * @queue_count: the number of subqueues to allocate
4333 * Allocates a struct net_device with private data area for driver use
4334 * and performs basic initialization. Also allocates subquue structs
4335 * for each queue on the device at the end of the netdevice.
4337 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
4338 void (*setup)(struct net_device *), unsigned int queue_count)
4340 struct netdev_queue *tx;
4341 struct net_device *dev;
4345 BUG_ON(strlen(name) >= sizeof(dev->name));
4347 alloc_size = sizeof(struct net_device);
4349 /* ensure 32-byte alignment of private area */
4350 alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
4351 alloc_size += sizeof_priv;
4353 /* ensure 32-byte alignment of whole construct */
4354 alloc_size += NETDEV_ALIGN_CONST;
4356 p = kzalloc(alloc_size, GFP_KERNEL);
4358 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
4362 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
4364 printk(KERN_ERR "alloc_netdev: Unable to allocate "
4370 dev = (struct net_device *)
4371 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4372 dev->padded = (char *)dev - (char *)p;
4373 dev_net_set(dev, &init_net);
4376 dev->num_tx_queues = queue_count;
4377 dev->real_num_tx_queues = queue_count;
4379 dev->gso_max_size = GSO_MAX_SIZE;
4381 netdev_init_queues(dev);
4383 netpoll_netdev_init(dev);
4385 strcpy(dev->name, name);
4388 EXPORT_SYMBOL(alloc_netdev_mq);
4391 * free_netdev - free network device
4394 * This function does the last stage of destroying an allocated device
4395 * interface. The reference to the device object is released.
4396 * If this is the last reference then it will be freed.
4398 void free_netdev(struct net_device *dev)
4400 release_net(dev_net(dev));
4404 /* Compatibility with error handling in drivers */
4405 if (dev->reg_state == NETREG_UNINITIALIZED) {
4406 kfree((char *)dev - dev->padded);
4410 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
4411 dev->reg_state = NETREG_RELEASED;
4413 /* will free via device release */
4414 put_device(&dev->dev);
4418 * synchronize_net - Synchronize with packet receive processing
4420 * Wait for packets currently being received to be done.
4421 * Does not block later packets from starting.
4423 void synchronize_net(void)
4430 * unregister_netdevice - remove device from the kernel
4433 * This function shuts down a device interface and removes it
4434 * from the kernel tables.
4436 * Callers must hold the rtnl semaphore. You may want
4437 * unregister_netdev() instead of this.
4440 void unregister_netdevice(struct net_device *dev)
4444 rollback_registered(dev);
4445 /* Finish processing unregister after unlock */
4450 * unregister_netdev - remove device from the kernel
4453 * This function shuts down a device interface and removes it
4454 * from the kernel tables.
4456 * This is just a wrapper for unregister_netdevice that takes
4457 * the rtnl semaphore. In general you want to use this and not
4458 * unregister_netdevice.
4460 void unregister_netdev(struct net_device *dev)
4463 unregister_netdevice(dev);
4467 EXPORT_SYMBOL(unregister_netdev);
4470 * dev_change_net_namespace - move device to different nethost namespace
4472 * @net: network namespace
4473 * @pat: If not NULL name pattern to try if the current device name
4474 * is already taken in the destination network namespace.
4476 * This function shuts down a device interface and moves it
4477 * to a new network namespace. On success 0 is returned, on
4478 * a failure a netagive errno code is returned.
4480 * Callers must hold the rtnl semaphore.
4483 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
4486 const char *destname;
4491 /* Don't allow namespace local devices to be moved. */
4493 if (dev->features & NETIF_F_NETNS_LOCAL)
4497 /* Don't allow real devices to be moved when sysfs
4501 if (dev->dev.parent)
4505 /* Ensure the device has been registrered */
4507 if (dev->reg_state != NETREG_REGISTERED)
4510 /* Get out if there is nothing todo */
4512 if (net_eq(dev_net(dev), net))
4515 /* Pick the destination device name, and ensure
4516 * we can use it in the destination network namespace.
4519 destname = dev->name;
4520 if (__dev_get_by_name(net, destname)) {
4521 /* We get here if we can't use the current device name */
4524 if (!dev_valid_name(pat))
4526 if (strchr(pat, '%')) {
4527 if (__dev_alloc_name(net, pat, buf) < 0)
4532 if (__dev_get_by_name(net, destname))
4537 * And now a mini version of register_netdevice unregister_netdevice.
4540 /* If device is running close it first. */
4543 /* And unlink it from device chain */
4545 unlist_netdevice(dev);
4549 /* Shutdown queueing discipline. */
4552 /* Notify protocols, that we are about to destroy
4553 this device. They should clean all the things.
4555 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4558 * Flush the unicast and multicast chains
4560 dev_addr_discard(dev);
4562 netdev_unregister_kobject(dev);
4564 /* Actually switch the network namespace */
4565 dev_net_set(dev, net);
4567 /* Assign the new device name */
4568 if (destname != dev->name)
4569 strcpy(dev->name, destname);
4571 /* If there is an ifindex conflict assign a new one */
4572 if (__dev_get_by_index(net, dev->ifindex)) {
4573 int iflink = (dev->iflink == dev->ifindex);
4574 dev->ifindex = dev_new_index(net);
4576 dev->iflink = dev->ifindex;
4579 /* Fixup kobjects */
4580 err = netdev_register_kobject(dev);
4583 /* Add the device back in the hashes */
4584 list_netdevice(dev);
4586 /* Notify protocols, that a new device appeared. */
4587 call_netdevice_notifiers(NETDEV_REGISTER, dev);
4595 static int dev_cpu_callback(struct notifier_block *nfb,
4596 unsigned long action,
4599 struct sk_buff **list_skb;
4600 struct Qdisc **list_net;
4601 struct sk_buff *skb;
4602 unsigned int cpu, oldcpu = (unsigned long)ocpu;
4603 struct softnet_data *sd, *oldsd;
4605 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
4608 local_irq_disable();
4609 cpu = smp_processor_id();
4610 sd = &per_cpu(softnet_data, cpu);
4611 oldsd = &per_cpu(softnet_data, oldcpu);
4613 /* Find end of our completion_queue. */
4614 list_skb = &sd->completion_queue;
4616 list_skb = &(*list_skb)->next;
4617 /* Append completion queue from offline CPU. */
4618 *list_skb = oldsd->completion_queue;
4619 oldsd->completion_queue = NULL;
4621 /* Find end of our output_queue. */
4622 list_net = &sd->output_queue;
4624 list_net = &(*list_net)->next_sched;
4625 /* Append output queue from offline CPU. */
4626 *list_net = oldsd->output_queue;
4627 oldsd->output_queue = NULL;
4629 raise_softirq_irqoff(NET_TX_SOFTIRQ);
4632 /* Process offline CPU's input_pkt_queue */
4633 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
4639 #ifdef CONFIG_NET_DMA
4641 * net_dma_rebalance - try to maintain one DMA channel per CPU
4642 * @net_dma: DMA client and associated data (lock, channels, channel_mask)
4644 * This is called when the number of channels allocated to the net_dma client
4645 * changes. The net_dma client tries to have one DMA channel per CPU.
4648 static void net_dma_rebalance(struct net_dma *net_dma)
4650 unsigned int cpu, i, n, chan_idx;
4651 struct dma_chan *chan;
4653 if (cpus_empty(net_dma->channel_mask)) {
4654 for_each_online_cpu(cpu)
4655 rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
4660 cpu = first_cpu(cpu_online_map);
4662 for_each_cpu_mask_nr(chan_idx, net_dma->channel_mask) {
4663 chan = net_dma->channels[chan_idx];
4665 n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
4666 + (i < (num_online_cpus() %
4667 cpus_weight(net_dma->channel_mask)) ? 1 : 0));
4670 per_cpu(softnet_data, cpu).net_dma = chan;
4671 cpu = next_cpu(cpu, cpu_online_map);
4679 * netdev_dma_event - event callback for the net_dma_client
4680 * @client: should always be net_dma_client
4681 * @chan: DMA channel for the event
4682 * @state: DMA state to be handled
4684 static enum dma_state_client
4685 netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
4686 enum dma_state state)
4688 int i, found = 0, pos = -1;
4689 struct net_dma *net_dma =
4690 container_of(client, struct net_dma, client);
4691 enum dma_state_client ack = DMA_DUP; /* default: take no action */
4693 spin_lock(&net_dma->lock);
4695 case DMA_RESOURCE_AVAILABLE:
4696 for (i = 0; i < nr_cpu_ids; i++)
4697 if (net_dma->channels[i] == chan) {
4700 } else if (net_dma->channels[i] == NULL && pos < 0)
4703 if (!found && pos >= 0) {
4705 net_dma->channels[pos] = chan;
4706 cpu_set(pos, net_dma->channel_mask);
4707 net_dma_rebalance(net_dma);
4710 case DMA_RESOURCE_REMOVED:
4711 for (i = 0; i < nr_cpu_ids; i++)
4712 if (net_dma->channels[i] == chan) {
4720 cpu_clear(pos, net_dma->channel_mask);
4721 net_dma->channels[i] = NULL;
4722 net_dma_rebalance(net_dma);
4728 spin_unlock(&net_dma->lock);
4734 * netdev_dma_register - register the networking subsystem as a DMA client
4736 static int __init netdev_dma_register(void)
4738 net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma),
4740 if (unlikely(!net_dma.channels)) {
4742 "netdev_dma: no memory for net_dma.channels\n");
4745 spin_lock_init(&net_dma.lock);
4746 dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
4747 dma_async_client_register(&net_dma.client);
4748 dma_async_client_chan_request(&net_dma.client);
4753 static int __init netdev_dma_register(void) { return -ENODEV; }
4754 #endif /* CONFIG_NET_DMA */
4757 * netdev_increment_features - increment feature set by one
4758 * @all: current feature set
4759 * @one: new feature set
4760 * @mask: mask feature set
4762 * Computes a new feature set after adding a device with feature set
4763 * @one to the master device with current feature set @all. Will not
4764 * enable anything that is off in @mask. Returns the new feature set.
4766 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
4769 /* If device needs checksumming, downgrade to it. */
4770 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
4771 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
4772 else if (mask & NETIF_F_ALL_CSUM) {
4773 /* If one device supports v4/v6 checksumming, set for all. */
4774 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
4775 !(all & NETIF_F_GEN_CSUM)) {
4776 all &= ~NETIF_F_ALL_CSUM;
4777 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
4780 /* If one device supports hw checksumming, set for all. */
4781 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
4782 all &= ~NETIF_F_ALL_CSUM;
4783 all |= NETIF_F_HW_CSUM;
4787 one |= NETIF_F_ALL_CSUM;
4789 one |= all & NETIF_F_ONE_FOR_ALL;
4790 all &= one | NETIF_F_LLTX | NETIF_F_GSO;
4791 all |= one & mask & NETIF_F_ONE_FOR_ALL;
4795 EXPORT_SYMBOL(netdev_increment_features);
4797 static struct hlist_head *netdev_create_hash(void)
4800 struct hlist_head *hash;
4802 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
4804 for (i = 0; i < NETDEV_HASHENTRIES; i++)
4805 INIT_HLIST_HEAD(&hash[i]);
4810 /* Initialize per network namespace state */
4811 static int __net_init netdev_init(struct net *net)
4813 INIT_LIST_HEAD(&net->dev_base_head);
4815 net->dev_name_head = netdev_create_hash();
4816 if (net->dev_name_head == NULL)
4819 net->dev_index_head = netdev_create_hash();
4820 if (net->dev_index_head == NULL)
4826 kfree(net->dev_name_head);
4832 * netdev_drivername - network driver for the device
4833 * @dev: network device
4834 * @buffer: buffer for resulting name
4835 * @len: size of buffer
4837 * Determine network driver for device.
4839 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
4841 const struct device_driver *driver;
4842 const struct device *parent;
4844 if (len <= 0 || !buffer)
4848 parent = dev->dev.parent;
4853 driver = parent->driver;
4854 if (driver && driver->name)
4855 strlcpy(buffer, driver->name, len);
4859 static void __net_exit netdev_exit(struct net *net)
4861 kfree(net->dev_name_head);
4862 kfree(net->dev_index_head);
4865 static struct pernet_operations __net_initdata netdev_net_ops = {
4866 .init = netdev_init,
4867 .exit = netdev_exit,
4870 static void __net_exit default_device_exit(struct net *net)
4872 struct net_device *dev, *next;
4874 * Push all migratable of the network devices back to the
4875 * initial network namespace
4878 for_each_netdev_safe(net, dev, next) {
4880 char fb_name[IFNAMSIZ];
4882 /* Ignore unmoveable devices (i.e. loopback) */
4883 if (dev->features & NETIF_F_NETNS_LOCAL)
4886 /* Delete virtual devices */
4887 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) {
4888 dev->rtnl_link_ops->dellink(dev);
4892 /* Push remaing network devices to init_net */
4893 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
4894 err = dev_change_net_namespace(dev, &init_net, fb_name);
4896 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
4897 __func__, dev->name, err);
4904 static struct pernet_operations __net_initdata default_device_ops = {
4905 .exit = default_device_exit,
4909 * Initialize the DEV module. At boot time this walks the device list and
4910 * unhooks any devices that fail to initialise (normally hardware not
4911 * present) and leaves us with a valid list of present and active devices.
4916 * This is called single threaded during boot, so no need
4917 * to take the rtnl semaphore.
4919 static int __init net_dev_init(void)
4921 int i, rc = -ENOMEM;
4923 BUG_ON(!dev_boot_phase);
4925 if (dev_proc_init())
4928 if (netdev_kobject_init())
4931 INIT_LIST_HEAD(&ptype_all);
4932 for (i = 0; i < PTYPE_HASH_SIZE; i++)
4933 INIT_LIST_HEAD(&ptype_base[i]);
4935 if (register_pernet_subsys(&netdev_net_ops))
4939 * Initialise the packet receive queues.
4942 for_each_possible_cpu(i) {
4943 struct softnet_data *queue;
4945 queue = &per_cpu(softnet_data, i);
4946 skb_queue_head_init(&queue->input_pkt_queue);
4947 queue->completion_queue = NULL;
4948 INIT_LIST_HEAD(&queue->poll_list);
4950 queue->backlog.poll = process_backlog;
4951 queue->backlog.weight = weight_p;
4956 /* The loopback device is special if any other network devices
4957 * is present in a network namespace the loopback device must
4958 * be present. Since we now dynamically allocate and free the
4959 * loopback device ensure this invariant is maintained by
4960 * keeping the loopback device as the first device on the
4961 * list of network devices. Ensuring the loopback devices
4962 * is the first device that appears and the last network device
4965 if (register_pernet_device(&loopback_net_ops))
4968 if (register_pernet_device(&default_device_ops))
4971 netdev_dma_register();
4973 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
4974 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
4976 hotcpu_notifier(dev_cpu_callback, 0);
4984 subsys_initcall(net_dev_init);
4986 EXPORT_SYMBOL(__dev_get_by_index);
4987 EXPORT_SYMBOL(__dev_get_by_name);
4988 EXPORT_SYMBOL(__dev_remove_pack);
4989 EXPORT_SYMBOL(dev_valid_name);
4990 EXPORT_SYMBOL(dev_add_pack);
4991 EXPORT_SYMBOL(dev_alloc_name);
4992 EXPORT_SYMBOL(dev_close);
4993 EXPORT_SYMBOL(dev_get_by_flags);
4994 EXPORT_SYMBOL(dev_get_by_index);
4995 EXPORT_SYMBOL(dev_get_by_name);
4996 EXPORT_SYMBOL(dev_open);
4997 EXPORT_SYMBOL(dev_queue_xmit);
4998 EXPORT_SYMBOL(dev_remove_pack);
4999 EXPORT_SYMBOL(dev_set_allmulti);
5000 EXPORT_SYMBOL(dev_set_promiscuity);
5001 EXPORT_SYMBOL(dev_change_flags);
5002 EXPORT_SYMBOL(dev_set_mtu);
5003 EXPORT_SYMBOL(dev_set_mac_address);
5004 EXPORT_SYMBOL(free_netdev);
5005 EXPORT_SYMBOL(netdev_boot_setup_check);
5006 EXPORT_SYMBOL(netdev_set_master);
5007 EXPORT_SYMBOL(netdev_state_change);
5008 EXPORT_SYMBOL(netif_receive_skb);
5009 EXPORT_SYMBOL(netif_rx);
5010 EXPORT_SYMBOL(register_gifconf);
5011 EXPORT_SYMBOL(register_netdevice);
5012 EXPORT_SYMBOL(register_netdevice_notifier);
5013 EXPORT_SYMBOL(skb_checksum_help);
5014 EXPORT_SYMBOL(synchronize_net);
5015 EXPORT_SYMBOL(unregister_netdevice);
5016 EXPORT_SYMBOL(unregister_netdevice_notifier);
5017 EXPORT_SYMBOL(net_enable_timestamp);
5018 EXPORT_SYMBOL(net_disable_timestamp);
5019 EXPORT_SYMBOL(dev_get_flags);
5021 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
5022 EXPORT_SYMBOL(br_handle_frame_hook);
5023 EXPORT_SYMBOL(br_fdb_get_hook);
5024 EXPORT_SYMBOL(br_fdb_put_hook);
5027 EXPORT_SYMBOL(dev_load);
5029 EXPORT_PER_CPU_SYMBOL(softnet_data);