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>
129 #include <trace/events/napi.h>
131 #include "net-sysfs.h"
133 /* Instead of increasing this, you should create a hash table. */
134 #define MAX_GRO_SKBS 8
136 /* This should be increased if a protocol with a bigger head is added. */
137 #define GRO_MAX_HEAD (MAX_HEADER + 128)
140 * The list of packet types we will receive (as opposed to discard)
141 * and the routines to invoke.
143 * Why 16. Because with 16 the only overlap we get on a hash of the
144 * low nibble of the protocol value is RARP/SNAP/X.25.
146 * NOTE: That is no longer true with the addition of VLAN tags. Not
147 * sure which should go first, but I bet it won't make much
148 * difference if we are running VLANs. The good news is that
149 * this protocol won't be in the list unless compiled in, so
150 * the average user (w/out VLANs) will not be adversely affected.
167 #define PTYPE_HASH_SIZE (16)
168 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
170 static DEFINE_SPINLOCK(ptype_lock
);
171 static struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
172 static struct list_head ptype_all __read_mostly
; /* Taps */
175 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
178 * Pure readers hold dev_base_lock for reading.
180 * Writers must hold the rtnl semaphore while they loop through the
181 * dev_base_head list, and hold dev_base_lock for writing when they do the
182 * actual updates. This allows pure readers to access the list even
183 * while a writer is preparing to update it.
185 * To put it another way, dev_base_lock is held for writing only to
186 * protect against pure readers; the rtnl semaphore provides the
187 * protection against other writers.
189 * See, for example usages, register_netdevice() and
190 * unregister_netdevice(), which must be called with the rtnl
193 DEFINE_RWLOCK(dev_base_lock
);
195 EXPORT_SYMBOL(dev_base_lock
);
197 #define NETDEV_HASHBITS 8
198 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
200 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
202 unsigned hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
203 return &net
->dev_name_head
[hash
& ((1 << NETDEV_HASHBITS
) - 1)];
206 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
208 return &net
->dev_index_head
[ifindex
& ((1 << NETDEV_HASHBITS
) - 1)];
211 /* Device list insertion */
212 static int list_netdevice(struct net_device
*dev
)
214 struct net
*net
= dev_net(dev
);
218 write_lock_bh(&dev_base_lock
);
219 list_add_tail(&dev
->dev_list
, &net
->dev_base_head
);
220 hlist_add_head(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
221 hlist_add_head(&dev
->index_hlist
, dev_index_hash(net
, dev
->ifindex
));
222 write_unlock_bh(&dev_base_lock
);
226 /* Device list removal */
227 static void unlist_netdevice(struct net_device
*dev
)
231 /* Unlink dev from the device chain */
232 write_lock_bh(&dev_base_lock
);
233 list_del(&dev
->dev_list
);
234 hlist_del(&dev
->name_hlist
);
235 hlist_del(&dev
->index_hlist
);
236 write_unlock_bh(&dev_base_lock
);
243 static RAW_NOTIFIER_HEAD(netdev_chain
);
246 * Device drivers call our routines to queue packets here. We empty the
247 * queue in the local softnet handler.
250 DEFINE_PER_CPU(struct softnet_data
, softnet_data
);
252 #ifdef CONFIG_LOCKDEP
254 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
255 * according to dev->type
257 static const unsigned short netdev_lock_type
[] =
258 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
259 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
260 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
261 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
262 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
263 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
264 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
265 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
266 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
267 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
268 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
269 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
270 ARPHRD_FCFABRIC
, ARPHRD_IEEE802_TR
, ARPHRD_IEEE80211
,
271 ARPHRD_IEEE80211_PRISM
, ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
,
272 ARPHRD_PHONET_PIPE
, ARPHRD_IEEE802154
, ARPHRD_IEEE802154_PHY
,
273 ARPHRD_VOID
, ARPHRD_NONE
};
275 static const char *netdev_lock_name
[] =
276 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
277 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
278 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
279 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
280 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
281 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
282 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
283 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
284 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
285 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
286 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
287 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
288 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
289 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
290 "_xmit_PHONET_PIPE", "_xmit_IEEE802154", "_xmit_IEEE802154_PHY",
291 "_xmit_VOID", "_xmit_NONE"};
293 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
294 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
296 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
300 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
301 if (netdev_lock_type
[i
] == dev_type
)
303 /* the last key is used by default */
304 return ARRAY_SIZE(netdev_lock_type
) - 1;
307 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
308 unsigned short dev_type
)
312 i
= netdev_lock_pos(dev_type
);
313 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
314 netdev_lock_name
[i
]);
317 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
321 i
= netdev_lock_pos(dev
->type
);
322 lockdep_set_class_and_name(&dev
->addr_list_lock
,
323 &netdev_addr_lock_key
[i
],
324 netdev_lock_name
[i
]);
327 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
328 unsigned short dev_type
)
331 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
336 /*******************************************************************************
338 Protocol management and registration routines
340 *******************************************************************************/
343 * Add a protocol ID to the list. Now that the input handler is
344 * smarter we can dispense with all the messy stuff that used to be
347 * BEWARE!!! Protocol handlers, mangling input packets,
348 * MUST BE last in hash buckets and checking protocol handlers
349 * MUST start from promiscuous ptype_all chain in net_bh.
350 * It is true now, do not change it.
351 * Explanation follows: if protocol handler, mangling packet, will
352 * be the first on list, it is not able to sense, that packet
353 * is cloned and should be copied-on-write, so that it will
354 * change it and subsequent readers will get broken packet.
359 * dev_add_pack - add packet handler
360 * @pt: packet type declaration
362 * Add a protocol handler to the networking stack. The passed &packet_type
363 * is linked into kernel lists and may not be freed until it has been
364 * removed from the kernel lists.
366 * This call does not sleep therefore it can not
367 * guarantee all CPU's that are in middle of receiving packets
368 * will see the new packet type (until the next received packet).
371 void dev_add_pack(struct packet_type
*pt
)
375 spin_lock_bh(&ptype_lock
);
376 if (pt
->type
== htons(ETH_P_ALL
))
377 list_add_rcu(&pt
->list
, &ptype_all
);
379 hash
= ntohs(pt
->type
) & PTYPE_HASH_MASK
;
380 list_add_rcu(&pt
->list
, &ptype_base
[hash
]);
382 spin_unlock_bh(&ptype_lock
);
386 * __dev_remove_pack - remove packet handler
387 * @pt: packet type declaration
389 * Remove a protocol handler that was previously added to the kernel
390 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
391 * from the kernel lists and can be freed or reused once this function
394 * The packet type might still be in use by receivers
395 * and must not be freed until after all the CPU's have gone
396 * through a quiescent state.
398 void __dev_remove_pack(struct packet_type
*pt
)
400 struct list_head
*head
;
401 struct packet_type
*pt1
;
403 spin_lock_bh(&ptype_lock
);
405 if (pt
->type
== htons(ETH_P_ALL
))
408 head
= &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
410 list_for_each_entry(pt1
, head
, list
) {
412 list_del_rcu(&pt
->list
);
417 printk(KERN_WARNING
"dev_remove_pack: %p not found.\n", pt
);
419 spin_unlock_bh(&ptype_lock
);
422 * dev_remove_pack - remove packet handler
423 * @pt: packet type declaration
425 * Remove a protocol handler that was previously added to the kernel
426 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
427 * from the kernel lists and can be freed or reused once this function
430 * This call sleeps to guarantee that no CPU is looking at the packet
433 void dev_remove_pack(struct packet_type
*pt
)
435 __dev_remove_pack(pt
);
440 /******************************************************************************
442 Device Boot-time Settings Routines
444 *******************************************************************************/
446 /* Boot time configuration table */
447 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
450 * netdev_boot_setup_add - add new setup entry
451 * @name: name of the device
452 * @map: configured settings for the device
454 * Adds new setup entry to the dev_boot_setup list. The function
455 * returns 0 on error and 1 on success. This is a generic routine to
458 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
460 struct netdev_boot_setup
*s
;
464 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
465 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
466 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
467 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
468 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
473 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
477 * netdev_boot_setup_check - check boot time settings
478 * @dev: the netdevice
480 * Check boot time settings for the device.
481 * The found settings are set for the device to be used
482 * later in the device probing.
483 * Returns 0 if no settings found, 1 if they are.
485 int netdev_boot_setup_check(struct net_device
*dev
)
487 struct netdev_boot_setup
*s
= dev_boot_setup
;
490 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
491 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
492 !strcmp(dev
->name
, s
[i
].name
)) {
493 dev
->irq
= s
[i
].map
.irq
;
494 dev
->base_addr
= s
[i
].map
.base_addr
;
495 dev
->mem_start
= s
[i
].map
.mem_start
;
496 dev
->mem_end
= s
[i
].map
.mem_end
;
505 * netdev_boot_base - get address from boot time settings
506 * @prefix: prefix for network device
507 * @unit: id for network device
509 * Check boot time settings for the base address of device.
510 * The found settings are set for the device to be used
511 * later in the device probing.
512 * Returns 0 if no settings found.
514 unsigned long netdev_boot_base(const char *prefix
, int unit
)
516 const struct netdev_boot_setup
*s
= dev_boot_setup
;
520 sprintf(name
, "%s%d", prefix
, unit
);
523 * If device already registered then return base of 1
524 * to indicate not to probe for this interface
526 if (__dev_get_by_name(&init_net
, name
))
529 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
530 if (!strcmp(name
, s
[i
].name
))
531 return s
[i
].map
.base_addr
;
536 * Saves at boot time configured settings for any netdevice.
538 int __init
netdev_boot_setup(char *str
)
543 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
548 memset(&map
, 0, sizeof(map
));
552 map
.base_addr
= ints
[2];
554 map
.mem_start
= ints
[3];
556 map
.mem_end
= ints
[4];
558 /* Add new entry to the list */
559 return netdev_boot_setup_add(str
, &map
);
562 __setup("netdev=", netdev_boot_setup
);
564 /*******************************************************************************
566 Device Interface Subroutines
568 *******************************************************************************/
571 * __dev_get_by_name - find a device by its name
572 * @net: the applicable net namespace
573 * @name: name to find
575 * Find an interface by name. Must be called under RTNL semaphore
576 * or @dev_base_lock. If the name is found a pointer to the device
577 * is returned. If the name is not found then %NULL is returned. The
578 * reference counters are not incremented so the caller must be
579 * careful with locks.
582 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
584 struct hlist_node
*p
;
586 hlist_for_each(p
, dev_name_hash(net
, name
)) {
587 struct net_device
*dev
588 = hlist_entry(p
, struct net_device
, name_hlist
);
589 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
596 * dev_get_by_name - find a device by its name
597 * @net: the applicable net namespace
598 * @name: name to find
600 * Find an interface by name. This can be called from any
601 * context and does its own locking. The returned handle has
602 * the usage count incremented and the caller must use dev_put() to
603 * release it when it is no longer needed. %NULL is returned if no
604 * matching device is found.
607 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
609 struct net_device
*dev
;
611 read_lock(&dev_base_lock
);
612 dev
= __dev_get_by_name(net
, name
);
615 read_unlock(&dev_base_lock
);
620 * __dev_get_by_index - find a device by its ifindex
621 * @net: the applicable net namespace
622 * @ifindex: index of device
624 * Search for an interface by index. Returns %NULL if the device
625 * is not found or a pointer to the device. The device has not
626 * had its reference counter increased so the caller must be careful
627 * about locking. The caller must hold either the RTNL semaphore
631 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
633 struct hlist_node
*p
;
635 hlist_for_each(p
, dev_index_hash(net
, ifindex
)) {
636 struct net_device
*dev
637 = hlist_entry(p
, struct net_device
, index_hlist
);
638 if (dev
->ifindex
== ifindex
)
646 * dev_get_by_index - find a device by its ifindex
647 * @net: the applicable net namespace
648 * @ifindex: index of device
650 * Search for an interface by index. Returns NULL if the device
651 * is not found or a pointer to the device. The device returned has
652 * had a reference added and the pointer is safe until the user calls
653 * dev_put to indicate they have finished with it.
656 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
658 struct net_device
*dev
;
660 read_lock(&dev_base_lock
);
661 dev
= __dev_get_by_index(net
, ifindex
);
664 read_unlock(&dev_base_lock
);
669 * dev_getbyhwaddr - find a device by its hardware address
670 * @net: the applicable net namespace
671 * @type: media type of device
672 * @ha: hardware address
674 * Search for an interface by MAC address. Returns NULL if the device
675 * is not found or a pointer to the device. The caller must hold the
676 * rtnl semaphore. The returned device has not had its ref count increased
677 * and the caller must therefore be careful about locking
680 * If the API was consistent this would be __dev_get_by_hwaddr
683 struct net_device
*dev_getbyhwaddr(struct net
*net
, unsigned short type
, char *ha
)
685 struct net_device
*dev
;
689 for_each_netdev(net
, dev
)
690 if (dev
->type
== type
&&
691 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
697 EXPORT_SYMBOL(dev_getbyhwaddr
);
699 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
701 struct net_device
*dev
;
704 for_each_netdev(net
, dev
)
705 if (dev
->type
== type
)
711 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
713 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
715 struct net_device
*dev
;
718 dev
= __dev_getfirstbyhwtype(net
, type
);
725 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
728 * dev_get_by_flags - find any device with given flags
729 * @net: the applicable net namespace
730 * @if_flags: IFF_* values
731 * @mask: bitmask of bits in if_flags to check
733 * Search for any interface with the given flags. Returns NULL if a device
734 * is not found or a pointer to the device. The device returned has
735 * had a reference added and the pointer is safe until the user calls
736 * dev_put to indicate they have finished with it.
739 struct net_device
* dev_get_by_flags(struct net
*net
, unsigned short if_flags
, unsigned short mask
)
741 struct net_device
*dev
, *ret
;
744 read_lock(&dev_base_lock
);
745 for_each_netdev(net
, dev
) {
746 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
752 read_unlock(&dev_base_lock
);
757 * dev_valid_name - check if name is okay for network device
760 * Network device names need to be valid file names to
761 * to allow sysfs to work. We also disallow any kind of
764 int dev_valid_name(const char *name
)
768 if (strlen(name
) >= IFNAMSIZ
)
770 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
774 if (*name
== '/' || isspace(*name
))
782 * __dev_alloc_name - allocate a name for a device
783 * @net: network namespace to allocate the device name in
784 * @name: name format string
785 * @buf: scratch buffer and result name string
787 * Passed a format string - eg "lt%d" it will try and find a suitable
788 * id. It scans list of devices to build up a free map, then chooses
789 * the first empty slot. The caller must hold the dev_base or rtnl lock
790 * while allocating the name and adding the device in order to avoid
792 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
793 * Returns the number of the unit assigned or a negative errno code.
796 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
800 const int max_netdevices
= 8*PAGE_SIZE
;
801 unsigned long *inuse
;
802 struct net_device
*d
;
804 p
= strnchr(name
, IFNAMSIZ
-1, '%');
807 * Verify the string as this thing may have come from
808 * the user. There must be either one "%d" and no other "%"
811 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
814 /* Use one page as a bit array of possible slots */
815 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
819 for_each_netdev(net
, d
) {
820 if (!sscanf(d
->name
, name
, &i
))
822 if (i
< 0 || i
>= max_netdevices
)
825 /* avoid cases where sscanf is not exact inverse of printf */
826 snprintf(buf
, IFNAMSIZ
, name
, i
);
827 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
831 i
= find_first_zero_bit(inuse
, max_netdevices
);
832 free_page((unsigned long) inuse
);
835 snprintf(buf
, IFNAMSIZ
, name
, i
);
836 if (!__dev_get_by_name(net
, buf
))
839 /* It is possible to run out of possible slots
840 * when the name is long and there isn't enough space left
841 * for the digits, or if all bits are used.
847 * dev_alloc_name - allocate a name for a device
849 * @name: name format string
851 * Passed a format string - eg "lt%d" it will try and find a suitable
852 * id. It scans list of devices to build up a free map, then chooses
853 * the first empty slot. The caller must hold the dev_base or rtnl lock
854 * while allocating the name and adding the device in order to avoid
856 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
857 * Returns the number of the unit assigned or a negative errno code.
860 int dev_alloc_name(struct net_device
*dev
, const char *name
)
866 BUG_ON(!dev_net(dev
));
868 ret
= __dev_alloc_name(net
, name
, buf
);
870 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
876 * dev_change_name - change name of a device
878 * @newname: name (or format string) must be at least IFNAMSIZ
880 * Change name of a device, can pass format strings "eth%d".
883 int dev_change_name(struct net_device
*dev
, const char *newname
)
885 char oldname
[IFNAMSIZ
];
891 BUG_ON(!dev_net(dev
));
894 if (dev
->flags
& IFF_UP
)
897 if (!dev_valid_name(newname
))
900 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0)
903 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
905 if (strchr(newname
, '%')) {
906 err
= dev_alloc_name(dev
, newname
);
910 else if (__dev_get_by_name(net
, newname
))
913 strlcpy(dev
->name
, newname
, IFNAMSIZ
);
916 /* For now only devices in the initial network namespace
919 if (net
== &init_net
) {
920 ret
= device_rename(&dev
->dev
, dev
->name
);
922 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
927 write_lock_bh(&dev_base_lock
);
928 hlist_del(&dev
->name_hlist
);
929 hlist_add_head(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
930 write_unlock_bh(&dev_base_lock
);
932 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
933 ret
= notifier_to_errno(ret
);
936 /* err >= 0 after dev_alloc_name() or stores the first errno */
939 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
943 "%s: name change rollback failed: %d.\n",
952 * dev_set_alias - change ifalias of a device
954 * @alias: name up to IFALIASZ
955 * @len: limit of bytes to copy from info
957 * Set ifalias for a device,
959 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
974 dev
->ifalias
= krealloc(dev
->ifalias
, len
+1, GFP_KERNEL
);
978 strlcpy(dev
->ifalias
, alias
, len
+1);
984 * netdev_features_change - device changes features
985 * @dev: device to cause notification
987 * Called to indicate a device has changed features.
989 void netdev_features_change(struct net_device
*dev
)
991 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
993 EXPORT_SYMBOL(netdev_features_change
);
996 * netdev_state_change - device changes state
997 * @dev: device to cause notification
999 * Called to indicate a device has changed state. This function calls
1000 * the notifier chains for netdev_chain and sends a NEWLINK message
1001 * to the routing socket.
1003 void netdev_state_change(struct net_device
*dev
)
1005 if (dev
->flags
& IFF_UP
) {
1006 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
1007 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0);
1011 void netdev_bonding_change(struct net_device
*dev
)
1013 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER
, dev
);
1015 EXPORT_SYMBOL(netdev_bonding_change
);
1018 * dev_load - load a network module
1019 * @net: the applicable net namespace
1020 * @name: name of interface
1022 * If a network interface is not present and the process has suitable
1023 * privileges this function loads the module. If module loading is not
1024 * available in this kernel then it becomes a nop.
1027 void dev_load(struct net
*net
, const char *name
)
1029 struct net_device
*dev
;
1031 read_lock(&dev_base_lock
);
1032 dev
= __dev_get_by_name(net
, name
);
1033 read_unlock(&dev_base_lock
);
1035 if (!dev
&& capable(CAP_SYS_MODULE
))
1036 request_module("%s", name
);
1040 * dev_open - prepare an interface for use.
1041 * @dev: device to open
1043 * Takes a device from down to up state. The device's private open
1044 * function is invoked and then the multicast lists are loaded. Finally
1045 * the device is moved into the up state and a %NETDEV_UP message is
1046 * sent to the netdev notifier chain.
1048 * Calling this function on an active interface is a nop. On a failure
1049 * a negative errno code is returned.
1051 int dev_open(struct net_device
*dev
)
1053 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1062 if (dev
->flags
& IFF_UP
)
1066 * Is it even present?
1068 if (!netif_device_present(dev
))
1071 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1072 ret
= notifier_to_errno(ret
);
1077 * Call device private open method
1079 set_bit(__LINK_STATE_START
, &dev
->state
);
1081 if (ops
->ndo_validate_addr
)
1082 ret
= ops
->ndo_validate_addr(dev
);
1084 if (!ret
&& ops
->ndo_open
)
1085 ret
= ops
->ndo_open(dev
);
1088 * If it went open OK then:
1092 clear_bit(__LINK_STATE_START
, &dev
->state
);
1097 dev
->flags
|= IFF_UP
;
1102 net_dmaengine_get();
1105 * Initialize multicasting status
1107 dev_set_rx_mode(dev
);
1110 * Wakeup transmit queue engine
1115 * ... and announce new interface.
1117 call_netdevice_notifiers(NETDEV_UP
, dev
);
1124 * dev_close - shutdown an interface.
1125 * @dev: device to shutdown
1127 * This function moves an active device into down state. A
1128 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1129 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1132 int dev_close(struct net_device
*dev
)
1134 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1139 if (!(dev
->flags
& IFF_UP
))
1143 * Tell people we are going down, so that they can
1144 * prepare to death, when device is still operating.
1146 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1148 clear_bit(__LINK_STATE_START
, &dev
->state
);
1150 /* Synchronize to scheduled poll. We cannot touch poll list,
1151 * it can be even on different cpu. So just clear netif_running().
1153 * dev->stop() will invoke napi_disable() on all of it's
1154 * napi_struct instances on this device.
1156 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1158 dev_deactivate(dev
);
1161 * Call the device specific close. This cannot fail.
1162 * Only if device is UP
1164 * We allow it to be called even after a DETACH hot-plug
1171 * Device is now down.
1174 dev
->flags
&= ~IFF_UP
;
1177 * Tell people we are down
1179 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1184 net_dmaengine_put();
1191 * dev_disable_lro - disable Large Receive Offload on a device
1194 * Disable Large Receive Offload (LRO) on a net device. Must be
1195 * called under RTNL. This is needed if received packets may be
1196 * forwarded to another interface.
1198 void dev_disable_lro(struct net_device
*dev
)
1200 if (dev
->ethtool_ops
&& dev
->ethtool_ops
->get_flags
&&
1201 dev
->ethtool_ops
->set_flags
) {
1202 u32 flags
= dev
->ethtool_ops
->get_flags(dev
);
1203 if (flags
& ETH_FLAG_LRO
) {
1204 flags
&= ~ETH_FLAG_LRO
;
1205 dev
->ethtool_ops
->set_flags(dev
, flags
);
1208 WARN_ON(dev
->features
& NETIF_F_LRO
);
1210 EXPORT_SYMBOL(dev_disable_lro
);
1213 static int dev_boot_phase
= 1;
1216 * Device change register/unregister. These are not inline or static
1217 * as we export them to the world.
1221 * register_netdevice_notifier - register a network notifier block
1224 * Register a notifier to be called when network device events occur.
1225 * The notifier passed is linked into the kernel structures and must
1226 * not be reused until it has been unregistered. A negative errno code
1227 * is returned on a failure.
1229 * When registered all registration and up events are replayed
1230 * to the new notifier to allow device to have a race free
1231 * view of the network device list.
1234 int register_netdevice_notifier(struct notifier_block
*nb
)
1236 struct net_device
*dev
;
1237 struct net_device
*last
;
1242 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1248 for_each_netdev(net
, dev
) {
1249 err
= nb
->notifier_call(nb
, NETDEV_REGISTER
, dev
);
1250 err
= notifier_to_errno(err
);
1254 if (!(dev
->flags
& IFF_UP
))
1257 nb
->notifier_call(nb
, NETDEV_UP
, dev
);
1268 for_each_netdev(net
, dev
) {
1272 if (dev
->flags
& IFF_UP
) {
1273 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1274 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1276 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1280 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1285 * unregister_netdevice_notifier - unregister a network notifier block
1288 * Unregister a notifier previously registered by
1289 * register_netdevice_notifier(). The notifier is unlinked into the
1290 * kernel structures and may then be reused. A negative errno code
1291 * is returned on a failure.
1294 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1299 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1305 * call_netdevice_notifiers - call all network notifier blocks
1306 * @val: value passed unmodified to notifier function
1307 * @dev: net_device pointer passed unmodified to notifier function
1309 * Call all network notifier blocks. Parameters and return value
1310 * are as for raw_notifier_call_chain().
1313 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1315 return raw_notifier_call_chain(&netdev_chain
, val
, dev
);
1318 /* When > 0 there are consumers of rx skb time stamps */
1319 static atomic_t netstamp_needed
= ATOMIC_INIT(0);
1321 void net_enable_timestamp(void)
1323 atomic_inc(&netstamp_needed
);
1326 void net_disable_timestamp(void)
1328 atomic_dec(&netstamp_needed
);
1331 static inline void net_timestamp(struct sk_buff
*skb
)
1333 if (atomic_read(&netstamp_needed
))
1334 __net_timestamp(skb
);
1336 skb
->tstamp
.tv64
= 0;
1340 * Support routine. Sends outgoing frames to any network
1341 * taps currently in use.
1344 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1346 struct packet_type
*ptype
;
1348 #ifdef CONFIG_NET_CLS_ACT
1349 if (!(skb
->tstamp
.tv64
&& (G_TC_FROM(skb
->tc_verd
) & AT_INGRESS
)))
1356 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1357 /* Never send packets back to the socket
1358 * they originated from - MvS (miquels@drinkel.ow.org)
1360 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1361 (ptype
->af_packet_priv
== NULL
||
1362 (struct sock
*)ptype
->af_packet_priv
!= skb
->sk
)) {
1363 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
1367 /* skb->nh should be correctly
1368 set by sender, so that the second statement is
1369 just protection against buggy protocols.
1371 skb_reset_mac_header(skb2
);
1373 if (skb_network_header(skb2
) < skb2
->data
||
1374 skb2
->network_header
> skb2
->tail
) {
1375 if (net_ratelimit())
1376 printk(KERN_CRIT
"protocol %04x is "
1378 skb2
->protocol
, dev
->name
);
1379 skb_reset_network_header(skb2
);
1382 skb2
->transport_header
= skb2
->network_header
;
1383 skb2
->pkt_type
= PACKET_OUTGOING
;
1384 ptype
->func(skb2
, skb
->dev
, ptype
, skb
->dev
);
1391 static inline void __netif_reschedule(struct Qdisc
*q
)
1393 struct softnet_data
*sd
;
1394 unsigned long flags
;
1396 local_irq_save(flags
);
1397 sd
= &__get_cpu_var(softnet_data
);
1398 q
->next_sched
= sd
->output_queue
;
1399 sd
->output_queue
= q
;
1400 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1401 local_irq_restore(flags
);
1404 void __netif_schedule(struct Qdisc
*q
)
1406 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
1407 __netif_reschedule(q
);
1409 EXPORT_SYMBOL(__netif_schedule
);
1411 void dev_kfree_skb_irq(struct sk_buff
*skb
)
1413 if (atomic_dec_and_test(&skb
->users
)) {
1414 struct softnet_data
*sd
;
1415 unsigned long flags
;
1417 local_irq_save(flags
);
1418 sd
= &__get_cpu_var(softnet_data
);
1419 skb
->next
= sd
->completion_queue
;
1420 sd
->completion_queue
= skb
;
1421 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1422 local_irq_restore(flags
);
1425 EXPORT_SYMBOL(dev_kfree_skb_irq
);
1427 void dev_kfree_skb_any(struct sk_buff
*skb
)
1429 if (in_irq() || irqs_disabled())
1430 dev_kfree_skb_irq(skb
);
1434 EXPORT_SYMBOL(dev_kfree_skb_any
);
1438 * netif_device_detach - mark device as removed
1439 * @dev: network device
1441 * Mark device as removed from system and therefore no longer available.
1443 void netif_device_detach(struct net_device
*dev
)
1445 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1446 netif_running(dev
)) {
1447 netif_tx_stop_all_queues(dev
);
1450 EXPORT_SYMBOL(netif_device_detach
);
1453 * netif_device_attach - mark device as attached
1454 * @dev: network device
1456 * Mark device as attached from system and restart if needed.
1458 void netif_device_attach(struct net_device
*dev
)
1460 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1461 netif_running(dev
)) {
1462 netif_tx_wake_all_queues(dev
);
1463 __netdev_watchdog_up(dev
);
1466 EXPORT_SYMBOL(netif_device_attach
);
1468 static bool can_checksum_protocol(unsigned long features
, __be16 protocol
)
1470 return ((features
& NETIF_F_GEN_CSUM
) ||
1471 ((features
& NETIF_F_IP_CSUM
) &&
1472 protocol
== htons(ETH_P_IP
)) ||
1473 ((features
& NETIF_F_IPV6_CSUM
) &&
1474 protocol
== htons(ETH_P_IPV6
)) ||
1475 ((features
& NETIF_F_FCOE_CRC
) &&
1476 protocol
== htons(ETH_P_FCOE
)));
1479 static bool dev_can_checksum(struct net_device
*dev
, struct sk_buff
*skb
)
1481 if (can_checksum_protocol(dev
->features
, skb
->protocol
))
1484 if (skb
->protocol
== htons(ETH_P_8021Q
)) {
1485 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
1486 if (can_checksum_protocol(dev
->features
& dev
->vlan_features
,
1487 veh
->h_vlan_encapsulated_proto
))
1495 * Invalidate hardware checksum when packet is to be mangled, and
1496 * complete checksum manually on outgoing path.
1498 int skb_checksum_help(struct sk_buff
*skb
)
1501 int ret
= 0, offset
;
1503 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
1504 goto out_set_summed
;
1506 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
1507 /* Let GSO fix up the checksum. */
1508 goto out_set_summed
;
1511 offset
= skb
->csum_start
- skb_headroom(skb
);
1512 BUG_ON(offset
>= skb_headlen(skb
));
1513 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
1515 offset
+= skb
->csum_offset
;
1516 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
1518 if (skb_cloned(skb
) &&
1519 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
1520 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
1525 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
1527 skb
->ip_summed
= CHECKSUM_NONE
;
1533 * skb_gso_segment - Perform segmentation on skb.
1534 * @skb: buffer to segment
1535 * @features: features for the output path (see dev->features)
1537 * This function segments the given skb and returns a list of segments.
1539 * It may return NULL if the skb requires no segmentation. This is
1540 * only possible when GSO is used for verifying header integrity.
1542 struct sk_buff
*skb_gso_segment(struct sk_buff
*skb
, int features
)
1544 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
1545 struct packet_type
*ptype
;
1546 __be16 type
= skb
->protocol
;
1549 skb_reset_mac_header(skb
);
1550 skb
->mac_len
= skb
->network_header
- skb
->mac_header
;
1551 __skb_pull(skb
, skb
->mac_len
);
1553 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
1554 struct net_device
*dev
= skb
->dev
;
1555 struct ethtool_drvinfo info
= {};
1557 if (dev
&& dev
->ethtool_ops
&& dev
->ethtool_ops
->get_drvinfo
)
1558 dev
->ethtool_ops
->get_drvinfo(dev
, &info
);
1560 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1562 info
.driver
, dev
? dev
->features
: 0L,
1563 skb
->sk
? skb
->sk
->sk_route_caps
: 0L,
1564 skb
->len
, skb
->data_len
, skb
->ip_summed
);
1566 if (skb_header_cloned(skb
) &&
1567 (err
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
)))
1568 return ERR_PTR(err
);
1572 list_for_each_entry_rcu(ptype
,
1573 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
1574 if (ptype
->type
== type
&& !ptype
->dev
&& ptype
->gso_segment
) {
1575 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
1576 err
= ptype
->gso_send_check(skb
);
1577 segs
= ERR_PTR(err
);
1578 if (err
|| skb_gso_ok(skb
, features
))
1580 __skb_push(skb
, (skb
->data
-
1581 skb_network_header(skb
)));
1583 segs
= ptype
->gso_segment(skb
, features
);
1589 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
1594 EXPORT_SYMBOL(skb_gso_segment
);
1596 /* Take action when hardware reception checksum errors are detected. */
1598 void netdev_rx_csum_fault(struct net_device
*dev
)
1600 if (net_ratelimit()) {
1601 printk(KERN_ERR
"%s: hw csum failure.\n",
1602 dev
? dev
->name
: "<unknown>");
1606 EXPORT_SYMBOL(netdev_rx_csum_fault
);
1609 /* Actually, we should eliminate this check as soon as we know, that:
1610 * 1. IOMMU is present and allows to map all the memory.
1611 * 2. No high memory really exists on this machine.
1614 static inline int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
1616 #ifdef CONFIG_HIGHMEM
1619 if (dev
->features
& NETIF_F_HIGHDMA
)
1622 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++)
1623 if (PageHighMem(skb_shinfo(skb
)->frags
[i
].page
))
1631 void (*destructor
)(struct sk_buff
*skb
);
1634 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1636 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
1638 struct dev_gso_cb
*cb
;
1641 struct sk_buff
*nskb
= skb
->next
;
1643 skb
->next
= nskb
->next
;
1646 } while (skb
->next
);
1648 cb
= DEV_GSO_CB(skb
);
1650 cb
->destructor(skb
);
1654 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1655 * @skb: buffer to segment
1657 * This function segments the given skb and stores the list of segments
1660 static int dev_gso_segment(struct sk_buff
*skb
)
1662 struct net_device
*dev
= skb
->dev
;
1663 struct sk_buff
*segs
;
1664 int features
= dev
->features
& ~(illegal_highdma(dev
, skb
) ?
1667 segs
= skb_gso_segment(skb
, features
);
1669 /* Verifying header integrity only. */
1674 return PTR_ERR(segs
);
1677 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
1678 skb
->destructor
= dev_gso_skb_destructor
;
1683 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
1684 struct netdev_queue
*txq
)
1686 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1689 if (likely(!skb
->next
)) {
1690 if (!list_empty(&ptype_all
))
1691 dev_queue_xmit_nit(skb
, dev
);
1693 if (netif_needs_gso(dev
, skb
)) {
1694 if (unlikely(dev_gso_segment(skb
)))
1701 * If device doesnt need skb->dst, release it right now while
1702 * its hot in this cpu cache
1704 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
1707 rc
= ops
->ndo_start_xmit(skb
, dev
);
1709 txq_trans_update(txq
);
1711 * TODO: if skb_orphan() was called by
1712 * dev->hard_start_xmit() (for example, the unmodified
1713 * igb driver does that; bnx2 doesn't), then
1714 * skb_tx_software_timestamp() will be unable to send
1715 * back the time stamp.
1717 * How can this be prevented? Always create another
1718 * reference to the socket before calling
1719 * dev->hard_start_xmit()? Prevent that skb_orphan()
1720 * does anything in dev->hard_start_xmit() by clearing
1721 * the skb destructor before the call and restoring it
1722 * afterwards, then doing the skb_orphan() ourselves?
1729 struct sk_buff
*nskb
= skb
->next
;
1731 skb
->next
= nskb
->next
;
1733 rc
= ops
->ndo_start_xmit(nskb
, dev
);
1735 nskb
->next
= skb
->next
;
1739 txq_trans_update(txq
);
1740 if (unlikely(netif_tx_queue_stopped(txq
) && skb
->next
))
1741 return NETDEV_TX_BUSY
;
1742 } while (skb
->next
);
1744 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
1751 static u32 skb_tx_hashrnd
;
1753 u16
skb_tx_hash(const struct net_device
*dev
, const struct sk_buff
*skb
)
1757 if (skb_rx_queue_recorded(skb
)) {
1758 hash
= skb_get_rx_queue(skb
);
1759 while (unlikely (hash
>= dev
->real_num_tx_queues
))
1760 hash
-= dev
->real_num_tx_queues
;
1764 if (skb
->sk
&& skb
->sk
->sk_hash
)
1765 hash
= skb
->sk
->sk_hash
;
1767 hash
= skb
->protocol
;
1769 hash
= jhash_1word(hash
, skb_tx_hashrnd
);
1771 return (u16
) (((u64
) hash
* dev
->real_num_tx_queues
) >> 32);
1773 EXPORT_SYMBOL(skb_tx_hash
);
1775 static struct netdev_queue
*dev_pick_tx(struct net_device
*dev
,
1776 struct sk_buff
*skb
)
1778 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1779 u16 queue_index
= 0;
1781 if (ops
->ndo_select_queue
)
1782 queue_index
= ops
->ndo_select_queue(dev
, skb
);
1783 else if (dev
->real_num_tx_queues
> 1)
1784 queue_index
= skb_tx_hash(dev
, skb
);
1786 skb_set_queue_mapping(skb
, queue_index
);
1787 return netdev_get_tx_queue(dev
, queue_index
);
1791 * dev_queue_xmit - transmit a buffer
1792 * @skb: buffer to transmit
1794 * Queue a buffer for transmission to a network device. The caller must
1795 * have set the device and priority and built the buffer before calling
1796 * this function. The function can be called from an interrupt.
1798 * A negative errno code is returned on a failure. A success does not
1799 * guarantee the frame will be transmitted as it may be dropped due
1800 * to congestion or traffic shaping.
1802 * -----------------------------------------------------------------------------------
1803 * I notice this method can also return errors from the queue disciplines,
1804 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1807 * Regardless of the return value, the skb is consumed, so it is currently
1808 * difficult to retry a send to this method. (You can bump the ref count
1809 * before sending to hold a reference for retry if you are careful.)
1811 * When calling this method, interrupts MUST be enabled. This is because
1812 * the BH enable code must have IRQs enabled so that it will not deadlock.
1815 int dev_queue_xmit(struct sk_buff
*skb
)
1817 struct net_device
*dev
= skb
->dev
;
1818 struct netdev_queue
*txq
;
1822 /* GSO will handle the following emulations directly. */
1823 if (netif_needs_gso(dev
, skb
))
1826 if (skb_has_frags(skb
) &&
1827 !(dev
->features
& NETIF_F_FRAGLIST
) &&
1828 __skb_linearize(skb
))
1831 /* Fragmented skb is linearized if device does not support SG,
1832 * or if at least one of fragments is in highmem and device
1833 * does not support DMA from it.
1835 if (skb_shinfo(skb
)->nr_frags
&&
1836 (!(dev
->features
& NETIF_F_SG
) || illegal_highdma(dev
, skb
)) &&
1837 __skb_linearize(skb
))
1840 /* If packet is not checksummed and device does not support
1841 * checksumming for this protocol, complete checksumming here.
1843 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
1844 skb_set_transport_header(skb
, skb
->csum_start
-
1846 if (!dev_can_checksum(dev
, skb
) && skb_checksum_help(skb
))
1851 /* Disable soft irqs for various locks below. Also
1852 * stops preemption for RCU.
1856 txq
= dev_pick_tx(dev
, skb
);
1857 q
= rcu_dereference(txq
->qdisc
);
1859 #ifdef CONFIG_NET_CLS_ACT
1860 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
,AT_EGRESS
);
1863 spinlock_t
*root_lock
= qdisc_lock(q
);
1865 spin_lock(root_lock
);
1867 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
1871 rc
= qdisc_enqueue_root(skb
, q
);
1874 spin_unlock(root_lock
);
1879 /* The device has no queue. Common case for software devices:
1880 loopback, all the sorts of tunnels...
1882 Really, it is unlikely that netif_tx_lock protection is necessary
1883 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1885 However, it is possible, that they rely on protection
1888 Check this and shot the lock. It is not prone from deadlocks.
1889 Either shot noqueue qdisc, it is even simpler 8)
1891 if (dev
->flags
& IFF_UP
) {
1892 int cpu
= smp_processor_id(); /* ok because BHs are off */
1894 if (txq
->xmit_lock_owner
!= cpu
) {
1896 HARD_TX_LOCK(dev
, txq
, cpu
);
1898 if (!netif_tx_queue_stopped(txq
)) {
1900 if (!dev_hard_start_xmit(skb
, dev
, txq
)) {
1901 HARD_TX_UNLOCK(dev
, txq
);
1905 HARD_TX_UNLOCK(dev
, txq
);
1906 if (net_ratelimit())
1907 printk(KERN_CRIT
"Virtual device %s asks to "
1908 "queue packet!\n", dev
->name
);
1910 /* Recursion is detected! It is possible,
1912 if (net_ratelimit())
1913 printk(KERN_CRIT
"Dead loop on virtual device "
1914 "%s, fix it urgently!\n", dev
->name
);
1919 rcu_read_unlock_bh();
1925 rcu_read_unlock_bh();
1930 /*=======================================================================
1932 =======================================================================*/
1934 int netdev_max_backlog __read_mostly
= 1000;
1935 int netdev_budget __read_mostly
= 300;
1936 int weight_p __read_mostly
= 64; /* old backlog weight */
1938 DEFINE_PER_CPU(struct netif_rx_stats
, netdev_rx_stat
) = { 0, };
1942 * netif_rx - post buffer to the network code
1943 * @skb: buffer to post
1945 * This function receives a packet from a device driver and queues it for
1946 * the upper (protocol) levels to process. It always succeeds. The buffer
1947 * may be dropped during processing for congestion control or by the
1951 * NET_RX_SUCCESS (no congestion)
1952 * NET_RX_DROP (packet was dropped)
1956 int netif_rx(struct sk_buff
*skb
)
1958 struct softnet_data
*queue
;
1959 unsigned long flags
;
1961 /* if netpoll wants it, pretend we never saw it */
1962 if (netpoll_rx(skb
))
1965 if (!skb
->tstamp
.tv64
)
1969 * The code is rearranged so that the path is the most
1970 * short when CPU is congested, but is still operating.
1972 local_irq_save(flags
);
1973 queue
= &__get_cpu_var(softnet_data
);
1975 __get_cpu_var(netdev_rx_stat
).total
++;
1976 if (queue
->input_pkt_queue
.qlen
<= netdev_max_backlog
) {
1977 if (queue
->input_pkt_queue
.qlen
) {
1979 __skb_queue_tail(&queue
->input_pkt_queue
, skb
);
1980 local_irq_restore(flags
);
1981 return NET_RX_SUCCESS
;
1984 napi_schedule(&queue
->backlog
);
1988 __get_cpu_var(netdev_rx_stat
).dropped
++;
1989 local_irq_restore(flags
);
1995 int netif_rx_ni(struct sk_buff
*skb
)
2000 err
= netif_rx(skb
);
2001 if (local_softirq_pending())
2008 EXPORT_SYMBOL(netif_rx_ni
);
2010 static void net_tx_action(struct softirq_action
*h
)
2012 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
2014 if (sd
->completion_queue
) {
2015 struct sk_buff
*clist
;
2017 local_irq_disable();
2018 clist
= sd
->completion_queue
;
2019 sd
->completion_queue
= NULL
;
2023 struct sk_buff
*skb
= clist
;
2024 clist
= clist
->next
;
2026 WARN_ON(atomic_read(&skb
->users
));
2031 if (sd
->output_queue
) {
2034 local_irq_disable();
2035 head
= sd
->output_queue
;
2036 sd
->output_queue
= NULL
;
2040 struct Qdisc
*q
= head
;
2041 spinlock_t
*root_lock
;
2043 head
= head
->next_sched
;
2045 root_lock
= qdisc_lock(q
);
2046 if (spin_trylock(root_lock
)) {
2047 smp_mb__before_clear_bit();
2048 clear_bit(__QDISC_STATE_SCHED
,
2051 spin_unlock(root_lock
);
2053 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
2055 __netif_reschedule(q
);
2057 smp_mb__before_clear_bit();
2058 clear_bit(__QDISC_STATE_SCHED
,
2066 static inline int deliver_skb(struct sk_buff
*skb
,
2067 struct packet_type
*pt_prev
,
2068 struct net_device
*orig_dev
)
2070 atomic_inc(&skb
->users
);
2071 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
2074 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2076 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
2077 /* This hook is defined here for ATM LANE */
2078 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
2079 unsigned char *addr
) __read_mostly
;
2080 EXPORT_SYMBOL(br_fdb_test_addr_hook
);
2084 * If bridge module is loaded call bridging hook.
2085 * returns NULL if packet was consumed.
2087 struct sk_buff
*(*br_handle_frame_hook
)(struct net_bridge_port
*p
,
2088 struct sk_buff
*skb
) __read_mostly
;
2089 EXPORT_SYMBOL(br_handle_frame_hook
);
2091 static inline struct sk_buff
*handle_bridge(struct sk_buff
*skb
,
2092 struct packet_type
**pt_prev
, int *ret
,
2093 struct net_device
*orig_dev
)
2095 struct net_bridge_port
*port
;
2097 if (skb
->pkt_type
== PACKET_LOOPBACK
||
2098 (port
= rcu_dereference(skb
->dev
->br_port
)) == NULL
)
2102 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
2106 return br_handle_frame_hook(port
, skb
);
2109 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2112 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2113 struct sk_buff
*(*macvlan_handle_frame_hook
)(struct sk_buff
*skb
) __read_mostly
;
2114 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook
);
2116 static inline struct sk_buff
*handle_macvlan(struct sk_buff
*skb
,
2117 struct packet_type
**pt_prev
,
2119 struct net_device
*orig_dev
)
2121 if (skb
->dev
->macvlan_port
== NULL
)
2125 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
2128 return macvlan_handle_frame_hook(skb
);
2131 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2134 #ifdef CONFIG_NET_CLS_ACT
2135 /* TODO: Maybe we should just force sch_ingress to be compiled in
2136 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2137 * a compare and 2 stores extra right now if we dont have it on
2138 * but have CONFIG_NET_CLS_ACT
2139 * NOTE: This doesnt stop any functionality; if you dont have
2140 * the ingress scheduler, you just cant add policies on ingress.
2143 static int ing_filter(struct sk_buff
*skb
)
2145 struct net_device
*dev
= skb
->dev
;
2146 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
2147 struct netdev_queue
*rxq
;
2148 int result
= TC_ACT_OK
;
2151 if (MAX_RED_LOOP
< ttl
++) {
2153 "Redir loop detected Dropping packet (%d->%d)\n",
2154 skb
->iif
, dev
->ifindex
);
2158 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
2159 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
2161 rxq
= &dev
->rx_queue
;
2164 if (q
!= &noop_qdisc
) {
2165 spin_lock(qdisc_lock(q
));
2166 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
2167 result
= qdisc_enqueue_root(skb
, q
);
2168 spin_unlock(qdisc_lock(q
));
2174 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
2175 struct packet_type
**pt_prev
,
2176 int *ret
, struct net_device
*orig_dev
)
2178 if (skb
->dev
->rx_queue
.qdisc
== &noop_qdisc
)
2182 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
2185 /* Huh? Why does turning on AF_PACKET affect this? */
2186 skb
->tc_verd
= SET_TC_OK2MUNGE(skb
->tc_verd
);
2189 switch (ing_filter(skb
)) {
2203 * netif_nit_deliver - deliver received packets to network taps
2206 * This function is used to deliver incoming packets to network
2207 * taps. It should be used when the normal netif_receive_skb path
2208 * is bypassed, for example because of VLAN acceleration.
2210 void netif_nit_deliver(struct sk_buff
*skb
)
2212 struct packet_type
*ptype
;
2214 if (list_empty(&ptype_all
))
2217 skb_reset_network_header(skb
);
2218 skb_reset_transport_header(skb
);
2219 skb
->mac_len
= skb
->network_header
- skb
->mac_header
;
2222 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
2223 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
)
2224 deliver_skb(skb
, ptype
, skb
->dev
);
2230 * netif_receive_skb - process receive buffer from network
2231 * @skb: buffer to process
2233 * netif_receive_skb() is the main receive data processing function.
2234 * It always succeeds. The buffer may be dropped during processing
2235 * for congestion control or by the protocol layers.
2237 * This function may only be called from softirq context and interrupts
2238 * should be enabled.
2240 * Return values (usually ignored):
2241 * NET_RX_SUCCESS: no congestion
2242 * NET_RX_DROP: packet was dropped
2244 int netif_receive_skb(struct sk_buff
*skb
)
2246 struct packet_type
*ptype
, *pt_prev
;
2247 struct net_device
*orig_dev
;
2248 struct net_device
*null_or_orig
;
2249 int ret
= NET_RX_DROP
;
2252 if (!skb
->tstamp
.tv64
)
2255 if (skb
->vlan_tci
&& vlan_hwaccel_do_receive(skb
))
2256 return NET_RX_SUCCESS
;
2258 /* if we've gotten here through NAPI, check netpoll */
2259 if (netpoll_receive_skb(skb
))
2263 skb
->iif
= skb
->dev
->ifindex
;
2265 null_or_orig
= NULL
;
2266 orig_dev
= skb
->dev
;
2267 if (orig_dev
->master
) {
2268 if (skb_bond_should_drop(skb
))
2269 null_or_orig
= orig_dev
; /* deliver only exact match */
2271 skb
->dev
= orig_dev
->master
;
2274 __get_cpu_var(netdev_rx_stat
).total
++;
2276 skb_reset_network_header(skb
);
2277 skb_reset_transport_header(skb
);
2278 skb
->mac_len
= skb
->network_header
- skb
->mac_header
;
2284 #ifdef CONFIG_NET_CLS_ACT
2285 if (skb
->tc_verd
& TC_NCLS
) {
2286 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
2291 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
2292 if (ptype
->dev
== null_or_orig
|| ptype
->dev
== skb
->dev
||
2293 ptype
->dev
== orig_dev
) {
2295 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
2300 #ifdef CONFIG_NET_CLS_ACT
2301 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
2307 skb
= handle_bridge(skb
, &pt_prev
, &ret
, orig_dev
);
2310 skb
= handle_macvlan(skb
, &pt_prev
, &ret
, orig_dev
);
2314 type
= skb
->protocol
;
2315 list_for_each_entry_rcu(ptype
,
2316 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
2317 if (ptype
->type
== type
&&
2318 (ptype
->dev
== null_or_orig
|| ptype
->dev
== skb
->dev
||
2319 ptype
->dev
== orig_dev
)) {
2321 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
2327 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
2330 /* Jamal, now you will not able to escape explaining
2331 * me how you were going to use this. :-)
2341 /* Network device is going away, flush any packets still pending */
2342 static void flush_backlog(void *arg
)
2344 struct net_device
*dev
= arg
;
2345 struct softnet_data
*queue
= &__get_cpu_var(softnet_data
);
2346 struct sk_buff
*skb
, *tmp
;
2348 skb_queue_walk_safe(&queue
->input_pkt_queue
, skb
, tmp
)
2349 if (skb
->dev
== dev
) {
2350 __skb_unlink(skb
, &queue
->input_pkt_queue
);
2355 static int napi_gro_complete(struct sk_buff
*skb
)
2357 struct packet_type
*ptype
;
2358 __be16 type
= skb
->protocol
;
2359 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
2362 if (NAPI_GRO_CB(skb
)->count
== 1) {
2363 skb_shinfo(skb
)->gso_size
= 0;
2368 list_for_each_entry_rcu(ptype
, head
, list
) {
2369 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_complete
)
2372 err
= ptype
->gro_complete(skb
);
2378 WARN_ON(&ptype
->list
== head
);
2380 return NET_RX_SUCCESS
;
2384 return netif_receive_skb(skb
);
2387 void napi_gro_flush(struct napi_struct
*napi
)
2389 struct sk_buff
*skb
, *next
;
2391 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
2394 napi_gro_complete(skb
);
2397 napi
->gro_count
= 0;
2398 napi
->gro_list
= NULL
;
2400 EXPORT_SYMBOL(napi_gro_flush
);
2402 int dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
2404 struct sk_buff
**pp
= NULL
;
2405 struct packet_type
*ptype
;
2406 __be16 type
= skb
->protocol
;
2407 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
2412 if (!(skb
->dev
->features
& NETIF_F_GRO
))
2415 if (skb_is_gso(skb
) || skb_has_frags(skb
))
2419 list_for_each_entry_rcu(ptype
, head
, list
) {
2420 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_receive
)
2423 skb_set_network_header(skb
, skb_gro_offset(skb
));
2424 mac_len
= skb
->network_header
- skb
->mac_header
;
2425 skb
->mac_len
= mac_len
;
2426 NAPI_GRO_CB(skb
)->same_flow
= 0;
2427 NAPI_GRO_CB(skb
)->flush
= 0;
2428 NAPI_GRO_CB(skb
)->free
= 0;
2430 pp
= ptype
->gro_receive(&napi
->gro_list
, skb
);
2435 if (&ptype
->list
== head
)
2438 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
2439 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
2442 struct sk_buff
*nskb
= *pp
;
2446 napi_gro_complete(nskb
);
2453 if (NAPI_GRO_CB(skb
)->flush
|| napi
->gro_count
>= MAX_GRO_SKBS
)
2457 NAPI_GRO_CB(skb
)->count
= 1;
2458 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
2459 skb
->next
= napi
->gro_list
;
2460 napi
->gro_list
= skb
;
2464 if (skb_headlen(skb
) < skb_gro_offset(skb
)) {
2465 int grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
2467 BUG_ON(skb
->end
- skb
->tail
< grow
);
2469 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
2472 skb
->data_len
-= grow
;
2474 skb_shinfo(skb
)->frags
[0].page_offset
+= grow
;
2475 skb_shinfo(skb
)->frags
[0].size
-= grow
;
2477 if (unlikely(!skb_shinfo(skb
)->frags
[0].size
)) {
2478 put_page(skb_shinfo(skb
)->frags
[0].page
);
2479 memmove(skb_shinfo(skb
)->frags
,
2480 skb_shinfo(skb
)->frags
+ 1,
2481 --skb_shinfo(skb
)->nr_frags
);
2492 EXPORT_SYMBOL(dev_gro_receive
);
2494 static int __napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
2498 if (netpoll_rx_on(skb
))
2501 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
2502 NAPI_GRO_CB(p
)->same_flow
= (p
->dev
== skb
->dev
)
2503 && !compare_ether_header(skb_mac_header(p
),
2504 skb_gro_mac_header(skb
));
2505 NAPI_GRO_CB(p
)->flush
= 0;
2508 return dev_gro_receive(napi
, skb
);
2511 int napi_skb_finish(int ret
, struct sk_buff
*skb
)
2513 int err
= NET_RX_SUCCESS
;
2517 return netif_receive_skb(skb
);
2523 case GRO_MERGED_FREE
:
2530 EXPORT_SYMBOL(napi_skb_finish
);
2532 void skb_gro_reset_offset(struct sk_buff
*skb
)
2534 NAPI_GRO_CB(skb
)->data_offset
= 0;
2535 NAPI_GRO_CB(skb
)->frag0
= NULL
;
2536 NAPI_GRO_CB(skb
)->frag0_len
= 0;
2538 if (skb
->mac_header
== skb
->tail
&&
2539 !PageHighMem(skb_shinfo(skb
)->frags
[0].page
)) {
2540 NAPI_GRO_CB(skb
)->frag0
=
2541 page_address(skb_shinfo(skb
)->frags
[0].page
) +
2542 skb_shinfo(skb
)->frags
[0].page_offset
;
2543 NAPI_GRO_CB(skb
)->frag0_len
= skb_shinfo(skb
)->frags
[0].size
;
2546 EXPORT_SYMBOL(skb_gro_reset_offset
);
2548 int napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
2550 skb_gro_reset_offset(skb
);
2552 return napi_skb_finish(__napi_gro_receive(napi
, skb
), skb
);
2554 EXPORT_SYMBOL(napi_gro_receive
);
2556 void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
2558 __skb_pull(skb
, skb_headlen(skb
));
2559 skb_reserve(skb
, NET_IP_ALIGN
- skb_headroom(skb
));
2563 EXPORT_SYMBOL(napi_reuse_skb
);
2565 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
2567 struct net_device
*dev
= napi
->dev
;
2568 struct sk_buff
*skb
= napi
->skb
;
2571 skb
= netdev_alloc_skb(dev
, GRO_MAX_HEAD
+ NET_IP_ALIGN
);
2575 skb_reserve(skb
, NET_IP_ALIGN
);
2583 EXPORT_SYMBOL(napi_get_frags
);
2585 int napi_frags_finish(struct napi_struct
*napi
, struct sk_buff
*skb
, int ret
)
2587 int err
= NET_RX_SUCCESS
;
2592 skb
->protocol
= eth_type_trans(skb
, napi
->dev
);
2594 if (ret
== GRO_NORMAL
)
2595 return netif_receive_skb(skb
);
2597 skb_gro_pull(skb
, -ETH_HLEN
);
2604 case GRO_MERGED_FREE
:
2605 napi_reuse_skb(napi
, skb
);
2611 EXPORT_SYMBOL(napi_frags_finish
);
2613 struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
2615 struct sk_buff
*skb
= napi
->skb
;
2622 skb_reset_mac_header(skb
);
2623 skb_gro_reset_offset(skb
);
2625 off
= skb_gro_offset(skb
);
2626 hlen
= off
+ sizeof(*eth
);
2627 eth
= skb_gro_header_fast(skb
, off
);
2628 if (skb_gro_header_hard(skb
, hlen
)) {
2629 eth
= skb_gro_header_slow(skb
, hlen
, off
);
2630 if (unlikely(!eth
)) {
2631 napi_reuse_skb(napi
, skb
);
2637 skb_gro_pull(skb
, sizeof(*eth
));
2640 * This works because the only protocols we care about don't require
2641 * special handling. We'll fix it up properly at the end.
2643 skb
->protocol
= eth
->h_proto
;
2648 EXPORT_SYMBOL(napi_frags_skb
);
2650 int napi_gro_frags(struct napi_struct
*napi
)
2652 struct sk_buff
*skb
= napi_frags_skb(napi
);
2657 return napi_frags_finish(napi
, skb
, __napi_gro_receive(napi
, skb
));
2659 EXPORT_SYMBOL(napi_gro_frags
);
2661 static int process_backlog(struct napi_struct
*napi
, int quota
)
2664 struct softnet_data
*queue
= &__get_cpu_var(softnet_data
);
2665 unsigned long start_time
= jiffies
;
2667 napi
->weight
= weight_p
;
2669 struct sk_buff
*skb
;
2671 local_irq_disable();
2672 skb
= __skb_dequeue(&queue
->input_pkt_queue
);
2674 __napi_complete(napi
);
2680 netif_receive_skb(skb
);
2681 } while (++work
< quota
&& jiffies
== start_time
);
2687 * __napi_schedule - schedule for receive
2688 * @n: entry to schedule
2690 * The entry's receive function will be scheduled to run
2692 void __napi_schedule(struct napi_struct
*n
)
2694 unsigned long flags
;
2696 local_irq_save(flags
);
2697 list_add_tail(&n
->poll_list
, &__get_cpu_var(softnet_data
).poll_list
);
2698 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2699 local_irq_restore(flags
);
2701 EXPORT_SYMBOL(__napi_schedule
);
2703 void __napi_complete(struct napi_struct
*n
)
2705 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
2706 BUG_ON(n
->gro_list
);
2708 list_del(&n
->poll_list
);
2709 smp_mb__before_clear_bit();
2710 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
2712 EXPORT_SYMBOL(__napi_complete
);
2714 void napi_complete(struct napi_struct
*n
)
2716 unsigned long flags
;
2719 * don't let napi dequeue from the cpu poll list
2720 * just in case its running on a different cpu
2722 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
2726 local_irq_save(flags
);
2728 local_irq_restore(flags
);
2730 EXPORT_SYMBOL(napi_complete
);
2732 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
2733 int (*poll
)(struct napi_struct
*, int), int weight
)
2735 INIT_LIST_HEAD(&napi
->poll_list
);
2736 napi
->gro_count
= 0;
2737 napi
->gro_list
= NULL
;
2740 napi
->weight
= weight
;
2741 list_add(&napi
->dev_list
, &dev
->napi_list
);
2743 #ifdef CONFIG_NETPOLL
2744 spin_lock_init(&napi
->poll_lock
);
2745 napi
->poll_owner
= -1;
2747 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
2749 EXPORT_SYMBOL(netif_napi_add
);
2751 void netif_napi_del(struct napi_struct
*napi
)
2753 struct sk_buff
*skb
, *next
;
2755 list_del_init(&napi
->dev_list
);
2756 napi_free_frags(napi
);
2758 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
2764 napi
->gro_list
= NULL
;
2765 napi
->gro_count
= 0;
2767 EXPORT_SYMBOL(netif_napi_del
);
2770 static void net_rx_action(struct softirq_action
*h
)
2772 struct list_head
*list
= &__get_cpu_var(softnet_data
).poll_list
;
2773 unsigned long time_limit
= jiffies
+ 2;
2774 int budget
= netdev_budget
;
2777 local_irq_disable();
2779 while (!list_empty(list
)) {
2780 struct napi_struct
*n
;
2783 /* If softirq window is exhuasted then punt.
2784 * Allow this to run for 2 jiffies since which will allow
2785 * an average latency of 1.5/HZ.
2787 if (unlikely(budget
<= 0 || time_after(jiffies
, time_limit
)))
2792 /* Even though interrupts have been re-enabled, this
2793 * access is safe because interrupts can only add new
2794 * entries to the tail of this list, and only ->poll()
2795 * calls can remove this head entry from the list.
2797 n
= list_entry(list
->next
, struct napi_struct
, poll_list
);
2799 have
= netpoll_poll_lock(n
);
2803 /* This NAPI_STATE_SCHED test is for avoiding a race
2804 * with netpoll's poll_napi(). Only the entity which
2805 * obtains the lock and sees NAPI_STATE_SCHED set will
2806 * actually make the ->poll() call. Therefore we avoid
2807 * accidently calling ->poll() when NAPI is not scheduled.
2810 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
2811 work
= n
->poll(n
, weight
);
2815 WARN_ON_ONCE(work
> weight
);
2819 local_irq_disable();
2821 /* Drivers must not modify the NAPI state if they
2822 * consume the entire weight. In such cases this code
2823 * still "owns" the NAPI instance and therefore can
2824 * move the instance around on the list at-will.
2826 if (unlikely(work
== weight
)) {
2827 if (unlikely(napi_disable_pending(n
))) {
2830 local_irq_disable();
2832 list_move_tail(&n
->poll_list
, list
);
2835 netpoll_poll_unlock(have
);
2840 #ifdef CONFIG_NET_DMA
2842 * There may not be any more sk_buffs coming right now, so push
2843 * any pending DMA copies to hardware
2845 dma_issue_pending_all();
2851 __get_cpu_var(netdev_rx_stat
).time_squeeze
++;
2852 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2856 static gifconf_func_t
* gifconf_list
[NPROTO
];
2859 * register_gifconf - register a SIOCGIF handler
2860 * @family: Address family
2861 * @gifconf: Function handler
2863 * Register protocol dependent address dumping routines. The handler
2864 * that is passed must not be freed or reused until it has been replaced
2865 * by another handler.
2867 int register_gifconf(unsigned int family
, gifconf_func_t
* gifconf
)
2869 if (family
>= NPROTO
)
2871 gifconf_list
[family
] = gifconf
;
2877 * Map an interface index to its name (SIOCGIFNAME)
2881 * We need this ioctl for efficient implementation of the
2882 * if_indextoname() function required by the IPv6 API. Without
2883 * it, we would have to search all the interfaces to find a
2887 static int dev_ifname(struct net
*net
, struct ifreq __user
*arg
)
2889 struct net_device
*dev
;
2893 * Fetch the caller's info block.
2896 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
2899 read_lock(&dev_base_lock
);
2900 dev
= __dev_get_by_index(net
, ifr
.ifr_ifindex
);
2902 read_unlock(&dev_base_lock
);
2906 strcpy(ifr
.ifr_name
, dev
->name
);
2907 read_unlock(&dev_base_lock
);
2909 if (copy_to_user(arg
, &ifr
, sizeof(struct ifreq
)))
2915 * Perform a SIOCGIFCONF call. This structure will change
2916 * size eventually, and there is nothing I can do about it.
2917 * Thus we will need a 'compatibility mode'.
2920 static int dev_ifconf(struct net
*net
, char __user
*arg
)
2923 struct net_device
*dev
;
2930 * Fetch the caller's info block.
2933 if (copy_from_user(&ifc
, arg
, sizeof(struct ifconf
)))
2940 * Loop over the interfaces, and write an info block for each.
2944 for_each_netdev(net
, dev
) {
2945 for (i
= 0; i
< NPROTO
; i
++) {
2946 if (gifconf_list
[i
]) {
2949 done
= gifconf_list
[i
](dev
, NULL
, 0);
2951 done
= gifconf_list
[i
](dev
, pos
+ total
,
2961 * All done. Write the updated control block back to the caller.
2963 ifc
.ifc_len
= total
;
2966 * Both BSD and Solaris return 0 here, so we do too.
2968 return copy_to_user(arg
, &ifc
, sizeof(struct ifconf
)) ? -EFAULT
: 0;
2971 #ifdef CONFIG_PROC_FS
2973 * This is invoked by the /proc filesystem handler to display a device
2976 void *dev_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2977 __acquires(dev_base_lock
)
2979 struct net
*net
= seq_file_net(seq
);
2981 struct net_device
*dev
;
2983 read_lock(&dev_base_lock
);
2985 return SEQ_START_TOKEN
;
2988 for_each_netdev(net
, dev
)
2995 void *dev_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2997 struct net
*net
= seq_file_net(seq
);
2999 return v
== SEQ_START_TOKEN
?
3000 first_net_device(net
) : next_net_device((struct net_device
*)v
);
3003 void dev_seq_stop(struct seq_file
*seq
, void *v
)
3004 __releases(dev_base_lock
)
3006 read_unlock(&dev_base_lock
);
3009 static void dev_seq_printf_stats(struct seq_file
*seq
, struct net_device
*dev
)
3011 const struct net_device_stats
*stats
= dev_get_stats(dev
);
3013 seq_printf(seq
, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3014 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3015 dev
->name
, stats
->rx_bytes
, stats
->rx_packets
,
3017 stats
->rx_dropped
+ stats
->rx_missed_errors
,
3018 stats
->rx_fifo_errors
,
3019 stats
->rx_length_errors
+ stats
->rx_over_errors
+
3020 stats
->rx_crc_errors
+ stats
->rx_frame_errors
,
3021 stats
->rx_compressed
, stats
->multicast
,
3022 stats
->tx_bytes
, stats
->tx_packets
,
3023 stats
->tx_errors
, stats
->tx_dropped
,
3024 stats
->tx_fifo_errors
, stats
->collisions
,
3025 stats
->tx_carrier_errors
+
3026 stats
->tx_aborted_errors
+
3027 stats
->tx_window_errors
+
3028 stats
->tx_heartbeat_errors
,
3029 stats
->tx_compressed
);
3033 * Called from the PROCfs module. This now uses the new arbitrary sized
3034 * /proc/net interface to create /proc/net/dev
3036 static int dev_seq_show(struct seq_file
*seq
, void *v
)
3038 if (v
== SEQ_START_TOKEN
)
3039 seq_puts(seq
, "Inter-| Receive "
3041 " face |bytes packets errs drop fifo frame "
3042 "compressed multicast|bytes packets errs "
3043 "drop fifo colls carrier compressed\n");
3045 dev_seq_printf_stats(seq
, v
);
3049 static struct netif_rx_stats
*softnet_get_online(loff_t
*pos
)
3051 struct netif_rx_stats
*rc
= NULL
;
3053 while (*pos
< nr_cpu_ids
)
3054 if (cpu_online(*pos
)) {
3055 rc
= &per_cpu(netdev_rx_stat
, *pos
);
3062 static void *softnet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3064 return softnet_get_online(pos
);
3067 static void *softnet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3070 return softnet_get_online(pos
);
3073 static void softnet_seq_stop(struct seq_file
*seq
, void *v
)
3077 static int softnet_seq_show(struct seq_file
*seq
, void *v
)
3079 struct netif_rx_stats
*s
= v
;
3081 seq_printf(seq
, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3082 s
->total
, s
->dropped
, s
->time_squeeze
, 0,
3083 0, 0, 0, 0, /* was fastroute */
3088 static const struct seq_operations dev_seq_ops
= {
3089 .start
= dev_seq_start
,
3090 .next
= dev_seq_next
,
3091 .stop
= dev_seq_stop
,
3092 .show
= dev_seq_show
,
3095 static int dev_seq_open(struct inode
*inode
, struct file
*file
)
3097 return seq_open_net(inode
, file
, &dev_seq_ops
,
3098 sizeof(struct seq_net_private
));
3101 static const struct file_operations dev_seq_fops
= {
3102 .owner
= THIS_MODULE
,
3103 .open
= dev_seq_open
,
3105 .llseek
= seq_lseek
,
3106 .release
= seq_release_net
,
3109 static const struct seq_operations softnet_seq_ops
= {
3110 .start
= softnet_seq_start
,
3111 .next
= softnet_seq_next
,
3112 .stop
= softnet_seq_stop
,
3113 .show
= softnet_seq_show
,
3116 static int softnet_seq_open(struct inode
*inode
, struct file
*file
)
3118 return seq_open(file
, &softnet_seq_ops
);
3121 static const struct file_operations softnet_seq_fops
= {
3122 .owner
= THIS_MODULE
,
3123 .open
= softnet_seq_open
,
3125 .llseek
= seq_lseek
,
3126 .release
= seq_release
,
3129 static void *ptype_get_idx(loff_t pos
)
3131 struct packet_type
*pt
= NULL
;
3135 list_for_each_entry_rcu(pt
, &ptype_all
, list
) {
3141 for (t
= 0; t
< PTYPE_HASH_SIZE
; t
++) {
3142 list_for_each_entry_rcu(pt
, &ptype_base
[t
], list
) {
3151 static void *ptype_seq_start(struct seq_file
*seq
, loff_t
*pos
)
3155 return *pos
? ptype_get_idx(*pos
- 1) : SEQ_START_TOKEN
;
3158 static void *ptype_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
3160 struct packet_type
*pt
;
3161 struct list_head
*nxt
;
3165 if (v
== SEQ_START_TOKEN
)
3166 return ptype_get_idx(0);
3169 nxt
= pt
->list
.next
;
3170 if (pt
->type
== htons(ETH_P_ALL
)) {
3171 if (nxt
!= &ptype_all
)
3174 nxt
= ptype_base
[0].next
;
3176 hash
= ntohs(pt
->type
) & PTYPE_HASH_MASK
;
3178 while (nxt
== &ptype_base
[hash
]) {
3179 if (++hash
>= PTYPE_HASH_SIZE
)
3181 nxt
= ptype_base
[hash
].next
;
3184 return list_entry(nxt
, struct packet_type
, list
);
3187 static void ptype_seq_stop(struct seq_file
*seq
, void *v
)
3193 static int ptype_seq_show(struct seq_file
*seq
, void *v
)
3195 struct packet_type
*pt
= v
;
3197 if (v
== SEQ_START_TOKEN
)
3198 seq_puts(seq
, "Type Device Function\n");
3199 else if (pt
->dev
== NULL
|| dev_net(pt
->dev
) == seq_file_net(seq
)) {
3200 if (pt
->type
== htons(ETH_P_ALL
))
3201 seq_puts(seq
, "ALL ");
3203 seq_printf(seq
, "%04x", ntohs(pt
->type
));
3205 seq_printf(seq
, " %-8s %pF\n",
3206 pt
->dev
? pt
->dev
->name
: "", pt
->func
);
3212 static const struct seq_operations ptype_seq_ops
= {
3213 .start
= ptype_seq_start
,
3214 .next
= ptype_seq_next
,
3215 .stop
= ptype_seq_stop
,
3216 .show
= ptype_seq_show
,
3219 static int ptype_seq_open(struct inode
*inode
, struct file
*file
)
3221 return seq_open_net(inode
, file
, &ptype_seq_ops
,
3222 sizeof(struct seq_net_private
));
3225 static const struct file_operations ptype_seq_fops
= {
3226 .owner
= THIS_MODULE
,
3227 .open
= ptype_seq_open
,
3229 .llseek
= seq_lseek
,
3230 .release
= seq_release_net
,
3234 static int __net_init
dev_proc_net_init(struct net
*net
)
3238 if (!proc_net_fops_create(net
, "dev", S_IRUGO
, &dev_seq_fops
))
3240 if (!proc_net_fops_create(net
, "softnet_stat", S_IRUGO
, &softnet_seq_fops
))
3242 if (!proc_net_fops_create(net
, "ptype", S_IRUGO
, &ptype_seq_fops
))
3245 if (wext_proc_init(net
))
3251 proc_net_remove(net
, "ptype");
3253 proc_net_remove(net
, "softnet_stat");
3255 proc_net_remove(net
, "dev");
3259 static void __net_exit
dev_proc_net_exit(struct net
*net
)
3261 wext_proc_exit(net
);
3263 proc_net_remove(net
, "ptype");
3264 proc_net_remove(net
, "softnet_stat");
3265 proc_net_remove(net
, "dev");
3268 static struct pernet_operations __net_initdata dev_proc_ops
= {
3269 .init
= dev_proc_net_init
,
3270 .exit
= dev_proc_net_exit
,
3273 static int __init
dev_proc_init(void)
3275 return register_pernet_subsys(&dev_proc_ops
);
3278 #define dev_proc_init() 0
3279 #endif /* CONFIG_PROC_FS */
3283 * netdev_set_master - set up master/slave pair
3284 * @slave: slave device
3285 * @master: new master device
3287 * Changes the master device of the slave. Pass %NULL to break the
3288 * bonding. The caller must hold the RTNL semaphore. On a failure
3289 * a negative errno code is returned. On success the reference counts
3290 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3291 * function returns zero.
3293 int netdev_set_master(struct net_device
*slave
, struct net_device
*master
)
3295 struct net_device
*old
= slave
->master
;
3305 slave
->master
= master
;
3313 slave
->flags
|= IFF_SLAVE
;
3315 slave
->flags
&= ~IFF_SLAVE
;
3317 rtmsg_ifinfo(RTM_NEWLINK
, slave
, IFF_SLAVE
);
3321 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
3323 const struct net_device_ops
*ops
= dev
->netdev_ops
;
3325 if ((dev
->flags
& IFF_UP
) && ops
->ndo_change_rx_flags
)
3326 ops
->ndo_change_rx_flags(dev
, flags
);
3329 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
)
3331 unsigned short old_flags
= dev
->flags
;
3337 dev
->flags
|= IFF_PROMISC
;
3338 dev
->promiscuity
+= inc
;
3339 if (dev
->promiscuity
== 0) {
3342 * If inc causes overflow, untouch promisc and return error.
3345 dev
->flags
&= ~IFF_PROMISC
;
3347 dev
->promiscuity
-= inc
;
3348 printk(KERN_WARNING
"%s: promiscuity touches roof, "
3349 "set promiscuity failed, promiscuity feature "
3350 "of device might be broken.\n", dev
->name
);
3354 if (dev
->flags
!= old_flags
) {
3355 printk(KERN_INFO
"device %s %s promiscuous mode\n",
3356 dev
->name
, (dev
->flags
& IFF_PROMISC
) ? "entered" :
3358 if (audit_enabled
) {
3359 current_uid_gid(&uid
, &gid
);
3360 audit_log(current
->audit_context
, GFP_ATOMIC
,
3361 AUDIT_ANOM_PROMISCUOUS
,
3362 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3363 dev
->name
, (dev
->flags
& IFF_PROMISC
),
3364 (old_flags
& IFF_PROMISC
),
3365 audit_get_loginuid(current
),
3367 audit_get_sessionid(current
));
3370 dev_change_rx_flags(dev
, IFF_PROMISC
);
3376 * dev_set_promiscuity - update promiscuity count on a device
3380 * Add or remove promiscuity from a device. While the count in the device
3381 * remains above zero the interface remains promiscuous. Once it hits zero
3382 * the device reverts back to normal filtering operation. A negative inc
3383 * value is used to drop promiscuity on the device.
3384 * Return 0 if successful or a negative errno code on error.
3386 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
3388 unsigned short old_flags
= dev
->flags
;
3391 err
= __dev_set_promiscuity(dev
, inc
);
3394 if (dev
->flags
!= old_flags
)
3395 dev_set_rx_mode(dev
);
3400 * dev_set_allmulti - update allmulti count on a device
3404 * Add or remove reception of all multicast frames to a device. While the
3405 * count in the device remains above zero the interface remains listening
3406 * to all interfaces. Once it hits zero the device reverts back to normal
3407 * filtering operation. A negative @inc value is used to drop the counter
3408 * when releasing a resource needing all multicasts.
3409 * Return 0 if successful or a negative errno code on error.
3412 int dev_set_allmulti(struct net_device
*dev
, int inc
)
3414 unsigned short old_flags
= dev
->flags
;
3418 dev
->flags
|= IFF_ALLMULTI
;
3419 dev
->allmulti
+= inc
;
3420 if (dev
->allmulti
== 0) {
3423 * If inc causes overflow, untouch allmulti and return error.
3426 dev
->flags
&= ~IFF_ALLMULTI
;
3428 dev
->allmulti
-= inc
;
3429 printk(KERN_WARNING
"%s: allmulti touches roof, "
3430 "set allmulti failed, allmulti feature of "
3431 "device might be broken.\n", dev
->name
);
3435 if (dev
->flags
^ old_flags
) {
3436 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
3437 dev_set_rx_mode(dev
);
3443 * Upload unicast and multicast address lists to device and
3444 * configure RX filtering. When the device doesn't support unicast
3445 * filtering it is put in promiscuous mode while unicast addresses
3448 void __dev_set_rx_mode(struct net_device
*dev
)
3450 const struct net_device_ops
*ops
= dev
->netdev_ops
;
3452 /* dev_open will call this function so the list will stay sane. */
3453 if (!(dev
->flags
&IFF_UP
))
3456 if (!netif_device_present(dev
))
3459 if (ops
->ndo_set_rx_mode
)
3460 ops
->ndo_set_rx_mode(dev
);
3462 /* Unicast addresses changes may only happen under the rtnl,
3463 * therefore calling __dev_set_promiscuity here is safe.
3465 if (dev
->uc
.count
> 0 && !dev
->uc_promisc
) {
3466 __dev_set_promiscuity(dev
, 1);
3467 dev
->uc_promisc
= 1;
3468 } else if (dev
->uc
.count
== 0 && dev
->uc_promisc
) {
3469 __dev_set_promiscuity(dev
, -1);
3470 dev
->uc_promisc
= 0;
3473 if (ops
->ndo_set_multicast_list
)
3474 ops
->ndo_set_multicast_list(dev
);
3478 void dev_set_rx_mode(struct net_device
*dev
)
3480 netif_addr_lock_bh(dev
);
3481 __dev_set_rx_mode(dev
);
3482 netif_addr_unlock_bh(dev
);
3485 /* hw addresses list handling functions */
3487 static int __hw_addr_add(struct netdev_hw_addr_list
*list
, unsigned char *addr
,
3488 int addr_len
, unsigned char addr_type
)
3490 struct netdev_hw_addr
*ha
;
3493 if (addr_len
> MAX_ADDR_LEN
)
3496 list_for_each_entry(ha
, &list
->list
, list
) {
3497 if (!memcmp(ha
->addr
, addr
, addr_len
) &&
3498 ha
->type
== addr_type
) {
3505 alloc_size
= sizeof(*ha
);
3506 if (alloc_size
< L1_CACHE_BYTES
)
3507 alloc_size
= L1_CACHE_BYTES
;
3508 ha
= kmalloc(alloc_size
, GFP_ATOMIC
);
3511 memcpy(ha
->addr
, addr
, addr_len
);
3512 ha
->type
= addr_type
;
3515 list_add_tail_rcu(&ha
->list
, &list
->list
);
3520 static void ha_rcu_free(struct rcu_head
*head
)
3522 struct netdev_hw_addr
*ha
;
3524 ha
= container_of(head
, struct netdev_hw_addr
, rcu_head
);
3528 static int __hw_addr_del(struct netdev_hw_addr_list
*list
, unsigned char *addr
,
3529 int addr_len
, unsigned char addr_type
)
3531 struct netdev_hw_addr
*ha
;
3533 list_for_each_entry(ha
, &list
->list
, list
) {
3534 if (!memcmp(ha
->addr
, addr
, addr_len
) &&
3535 (ha
->type
== addr_type
|| !addr_type
)) {
3538 list_del_rcu(&ha
->list
);
3539 call_rcu(&ha
->rcu_head
, ha_rcu_free
);
3547 static int __hw_addr_add_multiple(struct netdev_hw_addr_list
*to_list
,
3548 struct netdev_hw_addr_list
*from_list
,
3550 unsigned char addr_type
)
3553 struct netdev_hw_addr
*ha
, *ha2
;
3556 list_for_each_entry(ha
, &from_list
->list
, list
) {
3557 type
= addr_type
? addr_type
: ha
->type
;
3558 err
= __hw_addr_add(to_list
, ha
->addr
, addr_len
, type
);
3565 list_for_each_entry(ha2
, &from_list
->list
, list
) {
3568 type
= addr_type
? addr_type
: ha2
->type
;
3569 __hw_addr_del(to_list
, ha2
->addr
, addr_len
, type
);
3574 static void __hw_addr_del_multiple(struct netdev_hw_addr_list
*to_list
,
3575 struct netdev_hw_addr_list
*from_list
,
3577 unsigned char addr_type
)
3579 struct netdev_hw_addr
*ha
;
3582 list_for_each_entry(ha
, &from_list
->list
, list
) {
3583 type
= addr_type
? addr_type
: ha
->type
;
3584 __hw_addr_del(to_list
, ha
->addr
, addr_len
, addr_type
);
3588 static int __hw_addr_sync(struct netdev_hw_addr_list
*to_list
,
3589 struct netdev_hw_addr_list
*from_list
,
3593 struct netdev_hw_addr
*ha
, *tmp
;
3595 list_for_each_entry_safe(ha
, tmp
, &from_list
->list
, list
) {
3597 err
= __hw_addr_add(to_list
, ha
->addr
,
3598 addr_len
, ha
->type
);
3603 } else if (ha
->refcount
== 1) {
3604 __hw_addr_del(to_list
, ha
->addr
, addr_len
, ha
->type
);
3605 __hw_addr_del(from_list
, ha
->addr
, addr_len
, ha
->type
);
3611 static void __hw_addr_unsync(struct netdev_hw_addr_list
*to_list
,
3612 struct netdev_hw_addr_list
*from_list
,
3615 struct netdev_hw_addr
*ha
, *tmp
;
3617 list_for_each_entry_safe(ha
, tmp
, &from_list
->list
, list
) {
3619 __hw_addr_del(to_list
, ha
->addr
,
3620 addr_len
, ha
->type
);
3622 __hw_addr_del(from_list
, ha
->addr
,
3623 addr_len
, ha
->type
);
3628 static void __hw_addr_flush(struct netdev_hw_addr_list
*list
)
3630 struct netdev_hw_addr
*ha
, *tmp
;
3632 list_for_each_entry_safe(ha
, tmp
, &list
->list
, list
) {
3633 list_del_rcu(&ha
->list
);
3634 call_rcu(&ha
->rcu_head
, ha_rcu_free
);
3639 static void __hw_addr_init(struct netdev_hw_addr_list
*list
)
3641 INIT_LIST_HEAD(&list
->list
);
3645 /* Device addresses handling functions */
3647 static void dev_addr_flush(struct net_device
*dev
)
3649 /* rtnl_mutex must be held here */
3651 __hw_addr_flush(&dev
->dev_addrs
);
3652 dev
->dev_addr
= NULL
;
3655 static int dev_addr_init(struct net_device
*dev
)
3657 unsigned char addr
[MAX_ADDR_LEN
];
3658 struct netdev_hw_addr
*ha
;
3661 /* rtnl_mutex must be held here */
3663 __hw_addr_init(&dev
->dev_addrs
);
3664 memset(addr
, 0, sizeof(addr
));
3665 err
= __hw_addr_add(&dev
->dev_addrs
, addr
, sizeof(addr
),
3666 NETDEV_HW_ADDR_T_LAN
);
3669 * Get the first (previously created) address from the list
3670 * and set dev_addr pointer to this location.
3672 ha
= list_first_entry(&dev
->dev_addrs
.list
,
3673 struct netdev_hw_addr
, list
);
3674 dev
->dev_addr
= ha
->addr
;
3680 * dev_addr_add - Add a device address
3682 * @addr: address to add
3683 * @addr_type: address type
3685 * Add a device address to the device or increase the reference count if
3686 * it already exists.
3688 * The caller must hold the rtnl_mutex.
3690 int dev_addr_add(struct net_device
*dev
, unsigned char *addr
,
3691 unsigned char addr_type
)
3697 err
= __hw_addr_add(&dev
->dev_addrs
, addr
, dev
->addr_len
, addr_type
);
3699 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
3702 EXPORT_SYMBOL(dev_addr_add
);
3705 * dev_addr_del - Release a device address.
3707 * @addr: address to delete
3708 * @addr_type: address type
3710 * Release reference to a device address and remove it from the device
3711 * if the reference count drops to zero.
3713 * The caller must hold the rtnl_mutex.
3715 int dev_addr_del(struct net_device
*dev
, unsigned char *addr
,
3716 unsigned char addr_type
)
3719 struct netdev_hw_addr
*ha
;
3724 * We can not remove the first address from the list because
3725 * dev->dev_addr points to that.
3727 ha
= list_first_entry(&dev
->dev_addrs
.list
,
3728 struct netdev_hw_addr
, list
);
3729 if (ha
->addr
== dev
->dev_addr
&& ha
->refcount
== 1)
3732 err
= __hw_addr_del(&dev
->dev_addrs
, addr
, dev
->addr_len
,
3735 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
3738 EXPORT_SYMBOL(dev_addr_del
);
3741 * dev_addr_add_multiple - Add device addresses from another device
3742 * @to_dev: device to which addresses will be added
3743 * @from_dev: device from which addresses will be added
3744 * @addr_type: address type - 0 means type will be used from from_dev
3746 * Add device addresses of the one device to another.
3748 * The caller must hold the rtnl_mutex.
3750 int dev_addr_add_multiple(struct net_device
*to_dev
,
3751 struct net_device
*from_dev
,
3752 unsigned char addr_type
)
3758 if (from_dev
->addr_len
!= to_dev
->addr_len
)
3760 err
= __hw_addr_add_multiple(&to_dev
->dev_addrs
, &from_dev
->dev_addrs
,
3761 to_dev
->addr_len
, addr_type
);
3763 call_netdevice_notifiers(NETDEV_CHANGEADDR
, to_dev
);
3766 EXPORT_SYMBOL(dev_addr_add_multiple
);
3769 * dev_addr_del_multiple - Delete device addresses by another device
3770 * @to_dev: device where the addresses will be deleted
3771 * @from_dev: device by which addresses the addresses will be deleted
3772 * @addr_type: address type - 0 means type will used from from_dev
3774 * Deletes addresses in to device by the list of addresses in from device.
3776 * The caller must hold the rtnl_mutex.
3778 int dev_addr_del_multiple(struct net_device
*to_dev
,
3779 struct net_device
*from_dev
,
3780 unsigned char addr_type
)
3784 if (from_dev
->addr_len
!= to_dev
->addr_len
)
3786 __hw_addr_del_multiple(&to_dev
->dev_addrs
, &from_dev
->dev_addrs
,
3787 to_dev
->addr_len
, addr_type
);
3788 call_netdevice_notifiers(NETDEV_CHANGEADDR
, to_dev
);
3791 EXPORT_SYMBOL(dev_addr_del_multiple
);
3793 /* multicast addresses handling functions */
3795 int __dev_addr_delete(struct dev_addr_list
**list
, int *count
,
3796 void *addr
, int alen
, int glbl
)
3798 struct dev_addr_list
*da
;
3800 for (; (da
= *list
) != NULL
; list
= &da
->next
) {
3801 if (memcmp(da
->da_addr
, addr
, da
->da_addrlen
) == 0 &&
3802 alen
== da
->da_addrlen
) {
3804 int old_glbl
= da
->da_gusers
;
3821 int __dev_addr_add(struct dev_addr_list
**list
, int *count
,
3822 void *addr
, int alen
, int glbl
)
3824 struct dev_addr_list
*da
;
3826 for (da
= *list
; da
!= NULL
; da
= da
->next
) {
3827 if (memcmp(da
->da_addr
, addr
, da
->da_addrlen
) == 0 &&
3828 da
->da_addrlen
== alen
) {
3830 int old_glbl
= da
->da_gusers
;
3840 da
= kzalloc(sizeof(*da
), GFP_ATOMIC
);
3843 memcpy(da
->da_addr
, addr
, alen
);
3844 da
->da_addrlen
= alen
;
3846 da
->da_gusers
= glbl
? 1 : 0;
3854 * dev_unicast_delete - Release secondary unicast address.
3856 * @addr: address to delete
3858 * Release reference to a secondary unicast address and remove it
3859 * from the device if the reference count drops to zero.
3861 * The caller must hold the rtnl_mutex.
3863 int dev_unicast_delete(struct net_device
*dev
, void *addr
)
3869 netif_addr_lock_bh(dev
);
3870 err
= __hw_addr_del(&dev
->uc
, addr
, dev
->addr_len
,
3871 NETDEV_HW_ADDR_T_UNICAST
);
3873 __dev_set_rx_mode(dev
);
3874 netif_addr_unlock_bh(dev
);
3877 EXPORT_SYMBOL(dev_unicast_delete
);
3880 * dev_unicast_add - add a secondary unicast address
3882 * @addr: address to add
3884 * Add a secondary unicast address to the device or increase
3885 * the reference count if it already exists.
3887 * The caller must hold the rtnl_mutex.
3889 int dev_unicast_add(struct net_device
*dev
, void *addr
)
3895 netif_addr_lock_bh(dev
);
3896 err
= __hw_addr_add(&dev
->uc
, addr
, dev
->addr_len
,
3897 NETDEV_HW_ADDR_T_UNICAST
);
3899 __dev_set_rx_mode(dev
);
3900 netif_addr_unlock_bh(dev
);
3903 EXPORT_SYMBOL(dev_unicast_add
);
3905 int __dev_addr_sync(struct dev_addr_list
**to
, int *to_count
,
3906 struct dev_addr_list
**from
, int *from_count
)
3908 struct dev_addr_list
*da
, *next
;
3912 while (da
!= NULL
) {
3914 if (!da
->da_synced
) {
3915 err
= __dev_addr_add(to
, to_count
,
3916 da
->da_addr
, da
->da_addrlen
, 0);
3921 } else if (da
->da_users
== 1) {
3922 __dev_addr_delete(to
, to_count
,
3923 da
->da_addr
, da
->da_addrlen
, 0);
3924 __dev_addr_delete(from
, from_count
,
3925 da
->da_addr
, da
->da_addrlen
, 0);
3932 void __dev_addr_unsync(struct dev_addr_list
**to
, int *to_count
,
3933 struct dev_addr_list
**from
, int *from_count
)
3935 struct dev_addr_list
*da
, *next
;
3938 while (da
!= NULL
) {
3940 if (da
->da_synced
) {
3941 __dev_addr_delete(to
, to_count
,
3942 da
->da_addr
, da
->da_addrlen
, 0);
3944 __dev_addr_delete(from
, from_count
,
3945 da
->da_addr
, da
->da_addrlen
, 0);
3952 * dev_unicast_sync - Synchronize device's unicast list to another device
3953 * @to: destination device
3954 * @from: source device
3956 * Add newly added addresses to the destination device and release
3957 * addresses that have no users left. The source device must be
3958 * locked by netif_tx_lock_bh.
3960 * This function is intended to be called from the dev->set_rx_mode
3961 * function of layered software devices.
3963 int dev_unicast_sync(struct net_device
*to
, struct net_device
*from
)
3967 if (to
->addr_len
!= from
->addr_len
)
3970 netif_addr_lock_bh(to
);
3971 err
= __hw_addr_sync(&to
->uc
, &from
->uc
, to
->addr_len
);
3973 __dev_set_rx_mode(to
);
3974 netif_addr_unlock_bh(to
);
3977 EXPORT_SYMBOL(dev_unicast_sync
);
3980 * dev_unicast_unsync - Remove synchronized addresses from the destination device
3981 * @to: destination device
3982 * @from: source device
3984 * Remove all addresses that were added to the destination device by
3985 * dev_unicast_sync(). This function is intended to be called from the
3986 * dev->stop function of layered software devices.
3988 void dev_unicast_unsync(struct net_device
*to
, struct net_device
*from
)
3990 if (to
->addr_len
!= from
->addr_len
)
3993 netif_addr_lock_bh(from
);
3994 netif_addr_lock(to
);
3995 __hw_addr_unsync(&to
->uc
, &from
->uc
, to
->addr_len
);
3996 __dev_set_rx_mode(to
);
3997 netif_addr_unlock(to
);
3998 netif_addr_unlock_bh(from
);
4000 EXPORT_SYMBOL(dev_unicast_unsync
);
4002 static void dev_unicast_flush(struct net_device
*dev
)
4004 netif_addr_lock_bh(dev
);
4005 __hw_addr_flush(&dev
->uc
);
4006 netif_addr_unlock_bh(dev
);
4009 static void dev_unicast_init(struct net_device
*dev
)
4011 __hw_addr_init(&dev
->uc
);
4015 static void __dev_addr_discard(struct dev_addr_list
**list
)
4017 struct dev_addr_list
*tmp
;
4019 while (*list
!= NULL
) {
4022 if (tmp
->da_users
> tmp
->da_gusers
)
4023 printk("__dev_addr_discard: address leakage! "
4024 "da_users=%d\n", tmp
->da_users
);
4029 static void dev_addr_discard(struct net_device
*dev
)
4031 netif_addr_lock_bh(dev
);
4033 __dev_addr_discard(&dev
->mc_list
);
4036 netif_addr_unlock_bh(dev
);
4040 * dev_get_flags - get flags reported to userspace
4043 * Get the combination of flag bits exported through APIs to userspace.
4045 unsigned dev_get_flags(const struct net_device
*dev
)
4049 flags
= (dev
->flags
& ~(IFF_PROMISC
|
4054 (dev
->gflags
& (IFF_PROMISC
|
4057 if (netif_running(dev
)) {
4058 if (netif_oper_up(dev
))
4059 flags
|= IFF_RUNNING
;
4060 if (netif_carrier_ok(dev
))
4061 flags
|= IFF_LOWER_UP
;
4062 if (netif_dormant(dev
))
4063 flags
|= IFF_DORMANT
;
4070 * dev_change_flags - change device settings
4072 * @flags: device state flags
4074 * Change settings on device based state flags. The flags are
4075 * in the userspace exported format.
4077 int dev_change_flags(struct net_device
*dev
, unsigned flags
)
4080 int old_flags
= dev
->flags
;
4085 * Set the flags on our device.
4088 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
4089 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
4091 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
4095 * Load in the correct multicast list now the flags have changed.
4098 if ((old_flags
^ flags
) & IFF_MULTICAST
)
4099 dev_change_rx_flags(dev
, IFF_MULTICAST
);
4101 dev_set_rx_mode(dev
);
4104 * Have we downed the interface. We handle IFF_UP ourselves
4105 * according to user attempts to set it, rather than blindly
4110 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
4111 ret
= ((old_flags
& IFF_UP
) ? dev_close
: dev_open
)(dev
);
4114 dev_set_rx_mode(dev
);
4117 if (dev
->flags
& IFF_UP
&&
4118 ((old_flags
^ dev
->flags
) &~ (IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
|
4120 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
4122 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
4123 int inc
= (flags
& IFF_PROMISC
) ? +1 : -1;
4124 dev
->gflags
^= IFF_PROMISC
;
4125 dev_set_promiscuity(dev
, inc
);
4128 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4129 is important. Some (broken) drivers set IFF_PROMISC, when
4130 IFF_ALLMULTI is requested not asking us and not reporting.
4132 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
4133 int inc
= (flags
& IFF_ALLMULTI
) ? +1 : -1;
4134 dev
->gflags
^= IFF_ALLMULTI
;
4135 dev_set_allmulti(dev
, inc
);
4138 /* Exclude state transition flags, already notified */
4139 changes
= (old_flags
^ dev
->flags
) & ~(IFF_UP
| IFF_RUNNING
);
4141 rtmsg_ifinfo(RTM_NEWLINK
, dev
, changes
);
4147 * dev_set_mtu - Change maximum transfer unit
4149 * @new_mtu: new transfer unit
4151 * Change the maximum transfer size of the network device.
4153 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
4155 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4158 if (new_mtu
== dev
->mtu
)
4161 /* MTU must be positive. */
4165 if (!netif_device_present(dev
))
4169 if (ops
->ndo_change_mtu
)
4170 err
= ops
->ndo_change_mtu(dev
, new_mtu
);
4174 if (!err
&& dev
->flags
& IFF_UP
)
4175 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
4180 * dev_set_mac_address - Change Media Access Control Address
4184 * Change the hardware (MAC) address of the device
4186 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
4188 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4191 if (!ops
->ndo_set_mac_address
)
4193 if (sa
->sa_family
!= dev
->type
)
4195 if (!netif_device_present(dev
))
4197 err
= ops
->ndo_set_mac_address(dev
, sa
);
4199 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4204 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
4206 static int dev_ifsioc_locked(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4209 struct net_device
*dev
= __dev_get_by_name(net
, ifr
->ifr_name
);
4215 case SIOCGIFFLAGS
: /* Get interface flags */
4216 ifr
->ifr_flags
= (short) dev_get_flags(dev
);
4219 case SIOCGIFMETRIC
: /* Get the metric on the interface
4220 (currently unused) */
4221 ifr
->ifr_metric
= 0;
4224 case SIOCGIFMTU
: /* Get the MTU of a device */
4225 ifr
->ifr_mtu
= dev
->mtu
;
4230 memset(ifr
->ifr_hwaddr
.sa_data
, 0, sizeof ifr
->ifr_hwaddr
.sa_data
);
4232 memcpy(ifr
->ifr_hwaddr
.sa_data
, dev
->dev_addr
,
4233 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
4234 ifr
->ifr_hwaddr
.sa_family
= dev
->type
;
4242 ifr
->ifr_map
.mem_start
= dev
->mem_start
;
4243 ifr
->ifr_map
.mem_end
= dev
->mem_end
;
4244 ifr
->ifr_map
.base_addr
= dev
->base_addr
;
4245 ifr
->ifr_map
.irq
= dev
->irq
;
4246 ifr
->ifr_map
.dma
= dev
->dma
;
4247 ifr
->ifr_map
.port
= dev
->if_port
;
4251 ifr
->ifr_ifindex
= dev
->ifindex
;
4255 ifr
->ifr_qlen
= dev
->tx_queue_len
;
4259 /* dev_ioctl() should ensure this case
4271 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4273 static int dev_ifsioc(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4276 struct net_device
*dev
= __dev_get_by_name(net
, ifr
->ifr_name
);
4277 const struct net_device_ops
*ops
;
4282 ops
= dev
->netdev_ops
;
4285 case SIOCSIFFLAGS
: /* Set interface flags */
4286 return dev_change_flags(dev
, ifr
->ifr_flags
);
4288 case SIOCSIFMETRIC
: /* Set the metric on the interface
4289 (currently unused) */
4292 case SIOCSIFMTU
: /* Set the MTU of a device */
4293 return dev_set_mtu(dev
, ifr
->ifr_mtu
);
4296 return dev_set_mac_address(dev
, &ifr
->ifr_hwaddr
);
4298 case SIOCSIFHWBROADCAST
:
4299 if (ifr
->ifr_hwaddr
.sa_family
!= dev
->type
)
4301 memcpy(dev
->broadcast
, ifr
->ifr_hwaddr
.sa_data
,
4302 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
4303 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4307 if (ops
->ndo_set_config
) {
4308 if (!netif_device_present(dev
))
4310 return ops
->ndo_set_config(dev
, &ifr
->ifr_map
);
4315 if ((!ops
->ndo_set_multicast_list
&& !ops
->ndo_set_rx_mode
) ||
4316 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
4318 if (!netif_device_present(dev
))
4320 return dev_mc_add(dev
, ifr
->ifr_hwaddr
.sa_data
,
4324 if ((!ops
->ndo_set_multicast_list
&& !ops
->ndo_set_rx_mode
) ||
4325 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
4327 if (!netif_device_present(dev
))
4329 return dev_mc_delete(dev
, ifr
->ifr_hwaddr
.sa_data
,
4333 if (ifr
->ifr_qlen
< 0)
4335 dev
->tx_queue_len
= ifr
->ifr_qlen
;
4339 ifr
->ifr_newname
[IFNAMSIZ
-1] = '\0';
4340 return dev_change_name(dev
, ifr
->ifr_newname
);
4343 * Unknown or private ioctl
4347 if ((cmd
>= SIOCDEVPRIVATE
&&
4348 cmd
<= SIOCDEVPRIVATE
+ 15) ||
4349 cmd
== SIOCBONDENSLAVE
||
4350 cmd
== SIOCBONDRELEASE
||
4351 cmd
== SIOCBONDSETHWADDR
||
4352 cmd
== SIOCBONDSLAVEINFOQUERY
||
4353 cmd
== SIOCBONDINFOQUERY
||
4354 cmd
== SIOCBONDCHANGEACTIVE
||
4355 cmd
== SIOCGMIIPHY
||
4356 cmd
== SIOCGMIIREG
||
4357 cmd
== SIOCSMIIREG
||
4358 cmd
== SIOCBRADDIF
||
4359 cmd
== SIOCBRDELIF
||
4360 cmd
== SIOCSHWTSTAMP
||
4361 cmd
== SIOCWANDEV
) {
4363 if (ops
->ndo_do_ioctl
) {
4364 if (netif_device_present(dev
))
4365 err
= ops
->ndo_do_ioctl(dev
, ifr
, cmd
);
4377 * This function handles all "interface"-type I/O control requests. The actual
4378 * 'doing' part of this is dev_ifsioc above.
4382 * dev_ioctl - network device ioctl
4383 * @net: the applicable net namespace
4384 * @cmd: command to issue
4385 * @arg: pointer to a struct ifreq in user space
4387 * Issue ioctl functions to devices. This is normally called by the
4388 * user space syscall interfaces but can sometimes be useful for
4389 * other purposes. The return value is the return from the syscall if
4390 * positive or a negative errno code on error.
4393 int dev_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
4399 /* One special case: SIOCGIFCONF takes ifconf argument
4400 and requires shared lock, because it sleeps writing
4404 if (cmd
== SIOCGIFCONF
) {
4406 ret
= dev_ifconf(net
, (char __user
*) arg
);
4410 if (cmd
== SIOCGIFNAME
)
4411 return dev_ifname(net
, (struct ifreq __user
*)arg
);
4413 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
4416 ifr
.ifr_name
[IFNAMSIZ
-1] = 0;
4418 colon
= strchr(ifr
.ifr_name
, ':');
4423 * See which interface the caller is talking about.
4428 * These ioctl calls:
4429 * - can be done by all.
4430 * - atomic and do not require locking.
4441 dev_load(net
, ifr
.ifr_name
);
4442 read_lock(&dev_base_lock
);
4443 ret
= dev_ifsioc_locked(net
, &ifr
, cmd
);
4444 read_unlock(&dev_base_lock
);
4448 if (copy_to_user(arg
, &ifr
,
4449 sizeof(struct ifreq
)))
4455 dev_load(net
, ifr
.ifr_name
);
4457 ret
= dev_ethtool(net
, &ifr
);
4462 if (copy_to_user(arg
, &ifr
,
4463 sizeof(struct ifreq
)))
4469 * These ioctl calls:
4470 * - require superuser power.
4471 * - require strict serialization.
4477 if (!capable(CAP_NET_ADMIN
))
4479 dev_load(net
, ifr
.ifr_name
);
4481 ret
= dev_ifsioc(net
, &ifr
, cmd
);
4486 if (copy_to_user(arg
, &ifr
,
4487 sizeof(struct ifreq
)))
4493 * These ioctl calls:
4494 * - require superuser power.
4495 * - require strict serialization.
4496 * - do not return a value
4506 case SIOCSIFHWBROADCAST
:
4509 case SIOCBONDENSLAVE
:
4510 case SIOCBONDRELEASE
:
4511 case SIOCBONDSETHWADDR
:
4512 case SIOCBONDCHANGEACTIVE
:
4516 if (!capable(CAP_NET_ADMIN
))
4519 case SIOCBONDSLAVEINFOQUERY
:
4520 case SIOCBONDINFOQUERY
:
4521 dev_load(net
, ifr
.ifr_name
);
4523 ret
= dev_ifsioc(net
, &ifr
, cmd
);
4528 /* Get the per device memory space. We can add this but
4529 * currently do not support it */
4531 /* Set the per device memory buffer space.
4532 * Not applicable in our case */
4537 * Unknown or private ioctl.
4540 if (cmd
== SIOCWANDEV
||
4541 (cmd
>= SIOCDEVPRIVATE
&&
4542 cmd
<= SIOCDEVPRIVATE
+ 15)) {
4543 dev_load(net
, ifr
.ifr_name
);
4545 ret
= dev_ifsioc(net
, &ifr
, cmd
);
4547 if (!ret
&& copy_to_user(arg
, &ifr
,
4548 sizeof(struct ifreq
)))
4552 /* Take care of Wireless Extensions */
4553 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
)
4554 return wext_handle_ioctl(net
, &ifr
, cmd
, arg
);
4561 * dev_new_index - allocate an ifindex
4562 * @net: the applicable net namespace
4564 * Returns a suitable unique value for a new device interface
4565 * number. The caller must hold the rtnl semaphore or the
4566 * dev_base_lock to be sure it remains unique.
4568 static int dev_new_index(struct net
*net
)
4574 if (!__dev_get_by_index(net
, ifindex
))
4579 /* Delayed registration/unregisteration */
4580 static LIST_HEAD(net_todo_list
);
4582 static void net_set_todo(struct net_device
*dev
)
4584 list_add_tail(&dev
->todo_list
, &net_todo_list
);
4587 static void rollback_registered(struct net_device
*dev
)
4589 BUG_ON(dev_boot_phase
);
4592 /* Some devices call without registering for initialization unwind. */
4593 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
4594 printk(KERN_DEBUG
"unregister_netdevice: device %s/%p never "
4595 "was registered\n", dev
->name
, dev
);
4601 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
4603 /* If device is running, close it first. */
4606 /* And unlink it from device chain. */
4607 unlist_netdevice(dev
);
4609 dev
->reg_state
= NETREG_UNREGISTERING
;
4613 /* Shutdown queueing discipline. */
4617 /* Notify protocols, that we are about to destroy
4618 this device. They should clean all the things.
4620 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
4623 * Flush the unicast and multicast chains
4625 dev_unicast_flush(dev
);
4626 dev_addr_discard(dev
);
4628 if (dev
->netdev_ops
->ndo_uninit
)
4629 dev
->netdev_ops
->ndo_uninit(dev
);
4631 /* Notifier chain MUST detach us from master device. */
4632 WARN_ON(dev
->master
);
4634 /* Remove entries from kobject tree */
4635 netdev_unregister_kobject(dev
);
4642 static void __netdev_init_queue_locks_one(struct net_device
*dev
,
4643 struct netdev_queue
*dev_queue
,
4646 spin_lock_init(&dev_queue
->_xmit_lock
);
4647 netdev_set_xmit_lockdep_class(&dev_queue
->_xmit_lock
, dev
->type
);
4648 dev_queue
->xmit_lock_owner
= -1;
4651 static void netdev_init_queue_locks(struct net_device
*dev
)
4653 netdev_for_each_tx_queue(dev
, __netdev_init_queue_locks_one
, NULL
);
4654 __netdev_init_queue_locks_one(dev
, &dev
->rx_queue
, NULL
);
4657 unsigned long netdev_fix_features(unsigned long features
, const char *name
)
4659 /* Fix illegal SG+CSUM combinations. */
4660 if ((features
& NETIF_F_SG
) &&
4661 !(features
& NETIF_F_ALL_CSUM
)) {
4663 printk(KERN_NOTICE
"%s: Dropping NETIF_F_SG since no "
4664 "checksum feature.\n", name
);
4665 features
&= ~NETIF_F_SG
;
4668 /* TSO requires that SG is present as well. */
4669 if ((features
& NETIF_F_TSO
) && !(features
& NETIF_F_SG
)) {
4671 printk(KERN_NOTICE
"%s: Dropping NETIF_F_TSO since no "
4672 "SG feature.\n", name
);
4673 features
&= ~NETIF_F_TSO
;
4676 if (features
& NETIF_F_UFO
) {
4677 if (!(features
& NETIF_F_GEN_CSUM
)) {
4679 printk(KERN_ERR
"%s: Dropping NETIF_F_UFO "
4680 "since no NETIF_F_HW_CSUM feature.\n",
4682 features
&= ~NETIF_F_UFO
;
4685 if (!(features
& NETIF_F_SG
)) {
4687 printk(KERN_ERR
"%s: Dropping NETIF_F_UFO "
4688 "since no NETIF_F_SG feature.\n", name
);
4689 features
&= ~NETIF_F_UFO
;
4695 EXPORT_SYMBOL(netdev_fix_features
);
4698 * register_netdevice - register a network device
4699 * @dev: device to register
4701 * Take a completed network device structure and add it to the kernel
4702 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4703 * chain. 0 is returned on success. A negative errno code is returned
4704 * on a failure to set up the device, or if the name is a duplicate.
4706 * Callers must hold the rtnl semaphore. You may want
4707 * register_netdev() instead of this.
4710 * The locking appears insufficient to guarantee two parallel registers
4711 * will not get the same name.
4714 int register_netdevice(struct net_device
*dev
)
4716 struct hlist_head
*head
;
4717 struct hlist_node
*p
;
4719 struct net
*net
= dev_net(dev
);
4721 BUG_ON(dev_boot_phase
);
4726 /* When net_device's are persistent, this will be fatal. */
4727 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
4730 spin_lock_init(&dev
->addr_list_lock
);
4731 netdev_set_addr_lockdep_class(dev
);
4732 netdev_init_queue_locks(dev
);
4736 /* Init, if this function is available */
4737 if (dev
->netdev_ops
->ndo_init
) {
4738 ret
= dev
->netdev_ops
->ndo_init(dev
);
4746 if (!dev_valid_name(dev
->name
)) {
4751 dev
->ifindex
= dev_new_index(net
);
4752 if (dev
->iflink
== -1)
4753 dev
->iflink
= dev
->ifindex
;
4755 /* Check for existence of name */
4756 head
= dev_name_hash(net
, dev
->name
);
4757 hlist_for_each(p
, head
) {
4758 struct net_device
*d
4759 = hlist_entry(p
, struct net_device
, name_hlist
);
4760 if (!strncmp(d
->name
, dev
->name
, IFNAMSIZ
)) {
4766 /* Fix illegal checksum combinations */
4767 if ((dev
->features
& NETIF_F_HW_CSUM
) &&
4768 (dev
->features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
4769 printk(KERN_NOTICE
"%s: mixed HW and IP checksum settings.\n",
4771 dev
->features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
4774 if ((dev
->features
& NETIF_F_NO_CSUM
) &&
4775 (dev
->features
& (NETIF_F_HW_CSUM
|NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
4776 printk(KERN_NOTICE
"%s: mixed no checksumming and other settings.\n",
4778 dev
->features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
|NETIF_F_HW_CSUM
);
4781 dev
->features
= netdev_fix_features(dev
->features
, dev
->name
);
4783 /* Enable software GSO if SG is supported. */
4784 if (dev
->features
& NETIF_F_SG
)
4785 dev
->features
|= NETIF_F_GSO
;
4787 netdev_initialize_kobject(dev
);
4788 ret
= netdev_register_kobject(dev
);
4791 dev
->reg_state
= NETREG_REGISTERED
;
4794 * Default initial state at registry is that the
4795 * device is present.
4798 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
4800 dev_init_scheduler(dev
);
4802 list_netdevice(dev
);
4804 /* Notify protocols, that a new device appeared. */
4805 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
4806 ret
= notifier_to_errno(ret
);
4808 rollback_registered(dev
);
4809 dev
->reg_state
= NETREG_UNREGISTERED
;
4812 * Prevent userspace races by waiting until the network
4813 * device is fully setup before sending notifications.
4815 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
4821 if (dev
->netdev_ops
->ndo_uninit
)
4822 dev
->netdev_ops
->ndo_uninit(dev
);
4827 * init_dummy_netdev - init a dummy network device for NAPI
4828 * @dev: device to init
4830 * This takes a network device structure and initialize the minimum
4831 * amount of fields so it can be used to schedule NAPI polls without
4832 * registering a full blown interface. This is to be used by drivers
4833 * that need to tie several hardware interfaces to a single NAPI
4834 * poll scheduler due to HW limitations.
4836 int init_dummy_netdev(struct net_device
*dev
)
4838 /* Clear everything. Note we don't initialize spinlocks
4839 * are they aren't supposed to be taken by any of the
4840 * NAPI code and this dummy netdev is supposed to be
4841 * only ever used for NAPI polls
4843 memset(dev
, 0, sizeof(struct net_device
));
4845 /* make sure we BUG if trying to hit standard
4846 * register/unregister code path
4848 dev
->reg_state
= NETREG_DUMMY
;
4850 /* initialize the ref count */
4851 atomic_set(&dev
->refcnt
, 1);
4853 /* NAPI wants this */
4854 INIT_LIST_HEAD(&dev
->napi_list
);
4856 /* a dummy interface is started by default */
4857 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
4858 set_bit(__LINK_STATE_START
, &dev
->state
);
4862 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
4866 * register_netdev - register a network device
4867 * @dev: device to register
4869 * Take a completed network device structure and add it to the kernel
4870 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4871 * chain. 0 is returned on success. A negative errno code is returned
4872 * on a failure to set up the device, or if the name is a duplicate.
4874 * This is a wrapper around register_netdevice that takes the rtnl semaphore
4875 * and expands the device name if you passed a format string to
4878 int register_netdev(struct net_device
*dev
)
4885 * If the name is a format string the caller wants us to do a
4888 if (strchr(dev
->name
, '%')) {
4889 err
= dev_alloc_name(dev
, dev
->name
);
4894 err
= register_netdevice(dev
);
4899 EXPORT_SYMBOL(register_netdev
);
4902 * netdev_wait_allrefs - wait until all references are gone.
4904 * This is called when unregistering network devices.
4906 * Any protocol or device that holds a reference should register
4907 * for netdevice notification, and cleanup and put back the
4908 * reference if they receive an UNREGISTER event.
4909 * We can get stuck here if buggy protocols don't correctly
4912 static void netdev_wait_allrefs(struct net_device
*dev
)
4914 unsigned long rebroadcast_time
, warning_time
;
4916 rebroadcast_time
= warning_time
= jiffies
;
4917 while (atomic_read(&dev
->refcnt
) != 0) {
4918 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
4921 /* Rebroadcast unregister notification */
4922 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
4924 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
4926 /* We must not have linkwatch events
4927 * pending on unregister. If this
4928 * happens, we simply run the queue
4929 * unscheduled, resulting in a noop
4932 linkwatch_run_queue();
4937 rebroadcast_time
= jiffies
;
4942 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
4943 printk(KERN_EMERG
"unregister_netdevice: "
4944 "waiting for %s to become free. Usage "
4946 dev
->name
, atomic_read(&dev
->refcnt
));
4947 warning_time
= jiffies
;
4956 * register_netdevice(x1);
4957 * register_netdevice(x2);
4959 * unregister_netdevice(y1);
4960 * unregister_netdevice(y2);
4966 * We are invoked by rtnl_unlock().
4967 * This allows us to deal with problems:
4968 * 1) We can delete sysfs objects which invoke hotplug
4969 * without deadlocking with linkwatch via keventd.
4970 * 2) Since we run with the RTNL semaphore not held, we can sleep
4971 * safely in order to wait for the netdev refcnt to drop to zero.
4973 * We must not return until all unregister events added during
4974 * the interval the lock was held have been completed.
4976 void netdev_run_todo(void)
4978 struct list_head list
;
4980 /* Snapshot list, allow later requests */
4981 list_replace_init(&net_todo_list
, &list
);
4985 while (!list_empty(&list
)) {
4986 struct net_device
*dev
4987 = list_entry(list
.next
, struct net_device
, todo_list
);
4988 list_del(&dev
->todo_list
);
4990 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
4991 printk(KERN_ERR
"network todo '%s' but state %d\n",
4992 dev
->name
, dev
->reg_state
);
4997 dev
->reg_state
= NETREG_UNREGISTERED
;
4999 on_each_cpu(flush_backlog
, dev
, 1);
5001 netdev_wait_allrefs(dev
);
5004 BUG_ON(atomic_read(&dev
->refcnt
));
5005 WARN_ON(dev
->ip_ptr
);
5006 WARN_ON(dev
->ip6_ptr
);
5007 WARN_ON(dev
->dn_ptr
);
5009 if (dev
->destructor
)
5010 dev
->destructor(dev
);
5012 /* Free network device */
5013 kobject_put(&dev
->dev
.kobj
);
5018 * dev_get_stats - get network device statistics
5019 * @dev: device to get statistics from
5021 * Get network statistics from device. The device driver may provide
5022 * its own method by setting dev->netdev_ops->get_stats; otherwise
5023 * the internal statistics structure is used.
5025 const struct net_device_stats
*dev_get_stats(struct net_device
*dev
)
5027 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5029 if (ops
->ndo_get_stats
)
5030 return ops
->ndo_get_stats(dev
);
5032 unsigned long tx_bytes
= 0, tx_packets
= 0, tx_dropped
= 0;
5033 struct net_device_stats
*stats
= &dev
->stats
;
5035 struct netdev_queue
*txq
;
5037 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
5038 txq
= netdev_get_tx_queue(dev
, i
);
5039 tx_bytes
+= txq
->tx_bytes
;
5040 tx_packets
+= txq
->tx_packets
;
5041 tx_dropped
+= txq
->tx_dropped
;
5043 if (tx_bytes
|| tx_packets
|| tx_dropped
) {
5044 stats
->tx_bytes
= tx_bytes
;
5045 stats
->tx_packets
= tx_packets
;
5046 stats
->tx_dropped
= tx_dropped
;
5051 EXPORT_SYMBOL(dev_get_stats
);
5053 static void netdev_init_one_queue(struct net_device
*dev
,
5054 struct netdev_queue
*queue
,
5060 static void netdev_init_queues(struct net_device
*dev
)
5062 netdev_init_one_queue(dev
, &dev
->rx_queue
, NULL
);
5063 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
5064 spin_lock_init(&dev
->tx_global_lock
);
5068 * alloc_netdev_mq - allocate network device
5069 * @sizeof_priv: size of private data to allocate space for
5070 * @name: device name format string
5071 * @setup: callback to initialize device
5072 * @queue_count: the number of subqueues to allocate
5074 * Allocates a struct net_device with private data area for driver use
5075 * and performs basic initialization. Also allocates subquue structs
5076 * for each queue on the device at the end of the netdevice.
5078 struct net_device
*alloc_netdev_mq(int sizeof_priv
, const char *name
,
5079 void (*setup
)(struct net_device
*), unsigned int queue_count
)
5081 struct netdev_queue
*tx
;
5082 struct net_device
*dev
;
5084 struct net_device
*p
;
5086 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
5088 alloc_size
= sizeof(struct net_device
);
5090 /* ensure 32-byte alignment of private area */
5091 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
5092 alloc_size
+= sizeof_priv
;
5094 /* ensure 32-byte alignment of whole construct */
5095 alloc_size
+= NETDEV_ALIGN
- 1;
5097 p
= kzalloc(alloc_size
, GFP_KERNEL
);
5099 printk(KERN_ERR
"alloc_netdev: Unable to allocate device.\n");
5103 tx
= kcalloc(queue_count
, sizeof(struct netdev_queue
), GFP_KERNEL
);
5105 printk(KERN_ERR
"alloc_netdev: Unable to allocate "
5110 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
5111 dev
->padded
= (char *)dev
- (char *)p
;
5113 if (dev_addr_init(dev
))
5116 dev_unicast_init(dev
);
5118 dev_net_set(dev
, &init_net
);
5121 dev
->num_tx_queues
= queue_count
;
5122 dev
->real_num_tx_queues
= queue_count
;
5124 dev
->gso_max_size
= GSO_MAX_SIZE
;
5126 netdev_init_queues(dev
);
5128 INIT_LIST_HEAD(&dev
->napi_list
);
5129 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
5131 strcpy(dev
->name
, name
);
5141 EXPORT_SYMBOL(alloc_netdev_mq
);
5144 * free_netdev - free network device
5147 * This function does the last stage of destroying an allocated device
5148 * interface. The reference to the device object is released.
5149 * If this is the last reference then it will be freed.
5151 void free_netdev(struct net_device
*dev
)
5153 struct napi_struct
*p
, *n
;
5155 release_net(dev_net(dev
));
5159 /* Flush device addresses */
5160 dev_addr_flush(dev
);
5162 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
5165 /* Compatibility with error handling in drivers */
5166 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5167 kfree((char *)dev
- dev
->padded
);
5171 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
5172 dev
->reg_state
= NETREG_RELEASED
;
5174 /* will free via device release */
5175 put_device(&dev
->dev
);
5179 * synchronize_net - Synchronize with packet receive processing
5181 * Wait for packets currently being received to be done.
5182 * Does not block later packets from starting.
5184 void synchronize_net(void)
5191 * unregister_netdevice - remove device from the kernel
5194 * This function shuts down a device interface and removes it
5195 * from the kernel tables.
5197 * Callers must hold the rtnl semaphore. You may want
5198 * unregister_netdev() instead of this.
5201 void unregister_netdevice(struct net_device
*dev
)
5205 rollback_registered(dev
);
5206 /* Finish processing unregister after unlock */
5211 * unregister_netdev - remove device from the kernel
5214 * This function shuts down a device interface and removes it
5215 * from the kernel tables.
5217 * This is just a wrapper for unregister_netdevice that takes
5218 * the rtnl semaphore. In general you want to use this and not
5219 * unregister_netdevice.
5221 void unregister_netdev(struct net_device
*dev
)
5224 unregister_netdevice(dev
);
5228 EXPORT_SYMBOL(unregister_netdev
);
5231 * dev_change_net_namespace - move device to different nethost namespace
5233 * @net: network namespace
5234 * @pat: If not NULL name pattern to try if the current device name
5235 * is already taken in the destination network namespace.
5237 * This function shuts down a device interface and moves it
5238 * to a new network namespace. On success 0 is returned, on
5239 * a failure a netagive errno code is returned.
5241 * Callers must hold the rtnl semaphore.
5244 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
5247 const char *destname
;
5252 /* Don't allow namespace local devices to be moved. */
5254 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
5258 /* Don't allow real devices to be moved when sysfs
5262 if (dev
->dev
.parent
)
5266 /* Ensure the device has been registrered */
5268 if (dev
->reg_state
!= NETREG_REGISTERED
)
5271 /* Get out if there is nothing todo */
5273 if (net_eq(dev_net(dev
), net
))
5276 /* Pick the destination device name, and ensure
5277 * we can use it in the destination network namespace.
5280 destname
= dev
->name
;
5281 if (__dev_get_by_name(net
, destname
)) {
5282 /* We get here if we can't use the current device name */
5285 if (!dev_valid_name(pat
))
5287 if (strchr(pat
, '%')) {
5288 if (__dev_alloc_name(net
, pat
, buf
) < 0)
5293 if (__dev_get_by_name(net
, destname
))
5298 * And now a mini version of register_netdevice unregister_netdevice.
5301 /* If device is running close it first. */
5304 /* And unlink it from device chain */
5306 unlist_netdevice(dev
);
5310 /* Shutdown queueing discipline. */
5313 /* Notify protocols, that we are about to destroy
5314 this device. They should clean all the things.
5316 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5319 * Flush the unicast and multicast chains
5321 dev_unicast_flush(dev
);
5322 dev_addr_discard(dev
);
5324 netdev_unregister_kobject(dev
);
5326 /* Actually switch the network namespace */
5327 dev_net_set(dev
, net
);
5329 /* Assign the new device name */
5330 if (destname
!= dev
->name
)
5331 strcpy(dev
->name
, destname
);
5333 /* If there is an ifindex conflict assign a new one */
5334 if (__dev_get_by_index(net
, dev
->ifindex
)) {
5335 int iflink
= (dev
->iflink
== dev
->ifindex
);
5336 dev
->ifindex
= dev_new_index(net
);
5338 dev
->iflink
= dev
->ifindex
;
5341 /* Fixup kobjects */
5342 err
= netdev_register_kobject(dev
);
5345 /* Add the device back in the hashes */
5346 list_netdevice(dev
);
5348 /* Notify protocols, that a new device appeared. */
5349 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5352 * Prevent userspace races by waiting until the network
5353 * device is fully setup before sending notifications.
5355 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
5363 static int dev_cpu_callback(struct notifier_block
*nfb
,
5364 unsigned long action
,
5367 struct sk_buff
**list_skb
;
5368 struct Qdisc
**list_net
;
5369 struct sk_buff
*skb
;
5370 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
5371 struct softnet_data
*sd
, *oldsd
;
5373 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
5376 local_irq_disable();
5377 cpu
= smp_processor_id();
5378 sd
= &per_cpu(softnet_data
, cpu
);
5379 oldsd
= &per_cpu(softnet_data
, oldcpu
);
5381 /* Find end of our completion_queue. */
5382 list_skb
= &sd
->completion_queue
;
5384 list_skb
= &(*list_skb
)->next
;
5385 /* Append completion queue from offline CPU. */
5386 *list_skb
= oldsd
->completion_queue
;
5387 oldsd
->completion_queue
= NULL
;
5389 /* Find end of our output_queue. */
5390 list_net
= &sd
->output_queue
;
5392 list_net
= &(*list_net
)->next_sched
;
5393 /* Append output queue from offline CPU. */
5394 *list_net
= oldsd
->output_queue
;
5395 oldsd
->output_queue
= NULL
;
5397 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
5400 /* Process offline CPU's input_pkt_queue */
5401 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
)))
5409 * netdev_increment_features - increment feature set by one
5410 * @all: current feature set
5411 * @one: new feature set
5412 * @mask: mask feature set
5414 * Computes a new feature set after adding a device with feature set
5415 * @one to the master device with current feature set @all. Will not
5416 * enable anything that is off in @mask. Returns the new feature set.
5418 unsigned long netdev_increment_features(unsigned long all
, unsigned long one
,
5421 /* If device needs checksumming, downgrade to it. */
5422 if (all
& NETIF_F_NO_CSUM
&& !(one
& NETIF_F_NO_CSUM
))
5423 all
^= NETIF_F_NO_CSUM
| (one
& NETIF_F_ALL_CSUM
);
5424 else if (mask
& NETIF_F_ALL_CSUM
) {
5425 /* If one device supports v4/v6 checksumming, set for all. */
5426 if (one
& (NETIF_F_IP_CSUM
| NETIF_F_IPV6_CSUM
) &&
5427 !(all
& NETIF_F_GEN_CSUM
)) {
5428 all
&= ~NETIF_F_ALL_CSUM
;
5429 all
|= one
& (NETIF_F_IP_CSUM
| NETIF_F_IPV6_CSUM
);
5432 /* If one device supports hw checksumming, set for all. */
5433 if (one
& NETIF_F_GEN_CSUM
&& !(all
& NETIF_F_GEN_CSUM
)) {
5434 all
&= ~NETIF_F_ALL_CSUM
;
5435 all
|= NETIF_F_HW_CSUM
;
5439 one
|= NETIF_F_ALL_CSUM
;
5441 one
|= all
& NETIF_F_ONE_FOR_ALL
;
5442 all
&= one
| NETIF_F_LLTX
| NETIF_F_GSO
;
5443 all
|= one
& mask
& NETIF_F_ONE_FOR_ALL
;
5447 EXPORT_SYMBOL(netdev_increment_features
);
5449 static struct hlist_head
*netdev_create_hash(void)
5452 struct hlist_head
*hash
;
5454 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
5456 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
5457 INIT_HLIST_HEAD(&hash
[i
]);
5462 /* Initialize per network namespace state */
5463 static int __net_init
netdev_init(struct net
*net
)
5465 INIT_LIST_HEAD(&net
->dev_base_head
);
5467 net
->dev_name_head
= netdev_create_hash();
5468 if (net
->dev_name_head
== NULL
)
5471 net
->dev_index_head
= netdev_create_hash();
5472 if (net
->dev_index_head
== NULL
)
5478 kfree(net
->dev_name_head
);
5484 * netdev_drivername - network driver for the device
5485 * @dev: network device
5486 * @buffer: buffer for resulting name
5487 * @len: size of buffer
5489 * Determine network driver for device.
5491 char *netdev_drivername(const struct net_device
*dev
, char *buffer
, int len
)
5493 const struct device_driver
*driver
;
5494 const struct device
*parent
;
5496 if (len
<= 0 || !buffer
)
5500 parent
= dev
->dev
.parent
;
5505 driver
= parent
->driver
;
5506 if (driver
&& driver
->name
)
5507 strlcpy(buffer
, driver
->name
, len
);
5511 static void __net_exit
netdev_exit(struct net
*net
)
5513 kfree(net
->dev_name_head
);
5514 kfree(net
->dev_index_head
);
5517 static struct pernet_operations __net_initdata netdev_net_ops
= {
5518 .init
= netdev_init
,
5519 .exit
= netdev_exit
,
5522 static void __net_exit
default_device_exit(struct net
*net
)
5524 struct net_device
*dev
;
5526 * Push all migratable of the network devices back to the
5527 * initial network namespace
5531 for_each_netdev(net
, dev
) {
5533 char fb_name
[IFNAMSIZ
];
5535 /* Ignore unmoveable devices (i.e. loopback) */
5536 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
5539 /* Delete virtual devices */
5540 if (dev
->rtnl_link_ops
&& dev
->rtnl_link_ops
->dellink
) {
5541 dev
->rtnl_link_ops
->dellink(dev
);
5545 /* Push remaing network devices to init_net */
5546 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
5547 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
5549 printk(KERN_EMERG
"%s: failed to move %s to init_net: %d\n",
5550 __func__
, dev
->name
, err
);
5558 static struct pernet_operations __net_initdata default_device_ops
= {
5559 .exit
= default_device_exit
,
5563 * Initialize the DEV module. At boot time this walks the device list and
5564 * unhooks any devices that fail to initialise (normally hardware not
5565 * present) and leaves us with a valid list of present and active devices.
5570 * This is called single threaded during boot, so no need
5571 * to take the rtnl semaphore.
5573 static int __init
net_dev_init(void)
5575 int i
, rc
= -ENOMEM
;
5577 BUG_ON(!dev_boot_phase
);
5579 if (dev_proc_init())
5582 if (netdev_kobject_init())
5585 INIT_LIST_HEAD(&ptype_all
);
5586 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
5587 INIT_LIST_HEAD(&ptype_base
[i
]);
5589 if (register_pernet_subsys(&netdev_net_ops
))
5593 * Initialise the packet receive queues.
5596 for_each_possible_cpu(i
) {
5597 struct softnet_data
*queue
;
5599 queue
= &per_cpu(softnet_data
, i
);
5600 skb_queue_head_init(&queue
->input_pkt_queue
);
5601 queue
->completion_queue
= NULL
;
5602 INIT_LIST_HEAD(&queue
->poll_list
);
5604 queue
->backlog
.poll
= process_backlog
;
5605 queue
->backlog
.weight
= weight_p
;
5606 queue
->backlog
.gro_list
= NULL
;
5607 queue
->backlog
.gro_count
= 0;
5612 /* The loopback device is special if any other network devices
5613 * is present in a network namespace the loopback device must
5614 * be present. Since we now dynamically allocate and free the
5615 * loopback device ensure this invariant is maintained by
5616 * keeping the loopback device as the first device on the
5617 * list of network devices. Ensuring the loopback devices
5618 * is the first device that appears and the last network device
5621 if (register_pernet_device(&loopback_net_ops
))
5624 if (register_pernet_device(&default_device_ops
))
5627 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
5628 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
5630 hotcpu_notifier(dev_cpu_callback
, 0);
5638 subsys_initcall(net_dev_init
);
5640 static int __init
initialize_hashrnd(void)
5642 get_random_bytes(&skb_tx_hashrnd
, sizeof(skb_tx_hashrnd
));
5646 late_initcall_sync(initialize_hashrnd
);
5648 EXPORT_SYMBOL(__dev_get_by_index
);
5649 EXPORT_SYMBOL(__dev_get_by_name
);
5650 EXPORT_SYMBOL(__dev_remove_pack
);
5651 EXPORT_SYMBOL(dev_valid_name
);
5652 EXPORT_SYMBOL(dev_add_pack
);
5653 EXPORT_SYMBOL(dev_alloc_name
);
5654 EXPORT_SYMBOL(dev_close
);
5655 EXPORT_SYMBOL(dev_get_by_flags
);
5656 EXPORT_SYMBOL(dev_get_by_index
);
5657 EXPORT_SYMBOL(dev_get_by_name
);
5658 EXPORT_SYMBOL(dev_open
);
5659 EXPORT_SYMBOL(dev_queue_xmit
);
5660 EXPORT_SYMBOL(dev_remove_pack
);
5661 EXPORT_SYMBOL(dev_set_allmulti
);
5662 EXPORT_SYMBOL(dev_set_promiscuity
);
5663 EXPORT_SYMBOL(dev_change_flags
);
5664 EXPORT_SYMBOL(dev_set_mtu
);
5665 EXPORT_SYMBOL(dev_set_mac_address
);
5666 EXPORT_SYMBOL(free_netdev
);
5667 EXPORT_SYMBOL(netdev_boot_setup_check
);
5668 EXPORT_SYMBOL(netdev_set_master
);
5669 EXPORT_SYMBOL(netdev_state_change
);
5670 EXPORT_SYMBOL(netif_receive_skb
);
5671 EXPORT_SYMBOL(netif_rx
);
5672 EXPORT_SYMBOL(register_gifconf
);
5673 EXPORT_SYMBOL(register_netdevice
);
5674 EXPORT_SYMBOL(register_netdevice_notifier
);
5675 EXPORT_SYMBOL(skb_checksum_help
);
5676 EXPORT_SYMBOL(synchronize_net
);
5677 EXPORT_SYMBOL(unregister_netdevice
);
5678 EXPORT_SYMBOL(unregister_netdevice_notifier
);
5679 EXPORT_SYMBOL(net_enable_timestamp
);
5680 EXPORT_SYMBOL(net_disable_timestamp
);
5681 EXPORT_SYMBOL(dev_get_flags
);
5683 EXPORT_SYMBOL(dev_load
);
5685 EXPORT_PER_CPU_SYMBOL(softnet_data
);