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);
194 EXPORT_SYMBOL(dev_base_lock);
196 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
198 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
199 return &net->dev_name_head[hash & (NETDEV_HASHENTRIES - 1)];
202 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
204 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
207 /* Device list insertion */
208 static int list_netdevice(struct net_device *dev)
210 struct net *net = dev_net(dev);
214 write_lock_bh(&dev_base_lock);
215 list_add_tail(&dev->dev_list, &net->dev_base_head);
216 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
217 hlist_add_head_rcu(&dev->index_hlist,
218 dev_index_hash(net, dev->ifindex));
219 write_unlock_bh(&dev_base_lock);
223 /* Device list removal
224 * caller must respect a RCU grace period before freeing/reusing dev
226 static void unlist_netdevice(struct net_device *dev)
230 /* Unlink dev from the device chain */
231 write_lock_bh(&dev_base_lock);
232 list_del(&dev->dev_list);
233 hlist_del(&dev->name_hlist);
234 hlist_del_rcu(&dev->index_hlist);
235 write_unlock_bh(&dev_base_lock);
242 static RAW_NOTIFIER_HEAD(netdev_chain);
245 * Device drivers call our routines to queue packets here. We empty the
246 * queue in the local softnet handler.
249 DEFINE_PER_CPU(struct softnet_data, softnet_data);
250 EXPORT_PER_CPU_SYMBOL(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,
273 ARPHRD_VOID, ARPHRD_NONE};
275 static const char *const 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",
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);
384 EXPORT_SYMBOL(dev_add_pack);
387 * __dev_remove_pack - remove packet handler
388 * @pt: packet type declaration
390 * Remove a protocol handler that was previously added to the kernel
391 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
392 * from the kernel lists and can be freed or reused once this function
395 * The packet type might still be in use by receivers
396 * and must not be freed until after all the CPU's have gone
397 * through a quiescent state.
399 void __dev_remove_pack(struct packet_type *pt)
401 struct list_head *head;
402 struct packet_type *pt1;
404 spin_lock_bh(&ptype_lock);
406 if (pt->type == htons(ETH_P_ALL))
409 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
411 list_for_each_entry(pt1, head, list) {
413 list_del_rcu(&pt->list);
418 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
420 spin_unlock_bh(&ptype_lock);
422 EXPORT_SYMBOL(__dev_remove_pack);
425 * dev_remove_pack - remove packet handler
426 * @pt: packet type declaration
428 * Remove a protocol handler that was previously added to the kernel
429 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
430 * from the kernel lists and can be freed or reused once this function
433 * This call sleeps to guarantee that no CPU is looking at the packet
436 void dev_remove_pack(struct packet_type *pt)
438 __dev_remove_pack(pt);
442 EXPORT_SYMBOL(dev_remove_pack);
444 /******************************************************************************
446 Device Boot-time Settings Routines
448 *******************************************************************************/
450 /* Boot time configuration table */
451 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
454 * netdev_boot_setup_add - add new setup entry
455 * @name: name of the device
456 * @map: configured settings for the device
458 * Adds new setup entry to the dev_boot_setup list. The function
459 * returns 0 on error and 1 on success. This is a generic routine to
462 static int netdev_boot_setup_add(char *name, struct ifmap *map)
464 struct netdev_boot_setup *s;
468 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
469 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
470 memset(s[i].name, 0, sizeof(s[i].name));
471 strlcpy(s[i].name, name, IFNAMSIZ);
472 memcpy(&s[i].map, map, sizeof(s[i].map));
477 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
481 * netdev_boot_setup_check - check boot time settings
482 * @dev: the netdevice
484 * Check boot time settings for the device.
485 * The found settings are set for the device to be used
486 * later in the device probing.
487 * Returns 0 if no settings found, 1 if they are.
489 int netdev_boot_setup_check(struct net_device *dev)
491 struct netdev_boot_setup *s = dev_boot_setup;
494 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
495 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
496 !strcmp(dev->name, s[i].name)) {
497 dev->irq = s[i].map.irq;
498 dev->base_addr = s[i].map.base_addr;
499 dev->mem_start = s[i].map.mem_start;
500 dev->mem_end = s[i].map.mem_end;
506 EXPORT_SYMBOL(netdev_boot_setup_check);
510 * netdev_boot_base - get address from boot time settings
511 * @prefix: prefix for network device
512 * @unit: id for network device
514 * Check boot time settings for the base address of device.
515 * The found settings are set for the device to be used
516 * later in the device probing.
517 * Returns 0 if no settings found.
519 unsigned long netdev_boot_base(const char *prefix, int unit)
521 const struct netdev_boot_setup *s = dev_boot_setup;
525 sprintf(name, "%s%d", prefix, unit);
528 * If device already registered then return base of 1
529 * to indicate not to probe for this interface
531 if (__dev_get_by_name(&init_net, name))
534 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
535 if (!strcmp(name, s[i].name))
536 return s[i].map.base_addr;
541 * Saves at boot time configured settings for any netdevice.
543 int __init netdev_boot_setup(char *str)
548 str = get_options(str, ARRAY_SIZE(ints), ints);
553 memset(&map, 0, sizeof(map));
557 map.base_addr = ints[2];
559 map.mem_start = ints[3];
561 map.mem_end = ints[4];
563 /* Add new entry to the list */
564 return netdev_boot_setup_add(str, &map);
567 __setup("netdev=", netdev_boot_setup);
569 /*******************************************************************************
571 Device Interface Subroutines
573 *******************************************************************************/
576 * __dev_get_by_name - find a device by its name
577 * @net: the applicable net namespace
578 * @name: name to find
580 * Find an interface by name. Must be called under RTNL semaphore
581 * or @dev_base_lock. If the name is found a pointer to the device
582 * is returned. If the name is not found then %NULL is returned. The
583 * reference counters are not incremented so the caller must be
584 * careful with locks.
587 struct net_device *__dev_get_by_name(struct net *net, const char *name)
589 struct hlist_node *p;
591 hlist_for_each(p, dev_name_hash(net, name)) {
592 struct net_device *dev
593 = hlist_entry(p, struct net_device, name_hlist);
594 if (!strncmp(dev->name, name, IFNAMSIZ))
599 EXPORT_SYMBOL(__dev_get_by_name);
602 * dev_get_by_name - find a device by its name
603 * @net: the applicable net namespace
604 * @name: name to find
606 * Find an interface by name. This can be called from any
607 * context and does its own locking. The returned handle has
608 * the usage count incremented and the caller must use dev_put() to
609 * release it when it is no longer needed. %NULL is returned if no
610 * matching device is found.
613 struct net_device *dev_get_by_name(struct net *net, const char *name)
615 struct net_device *dev;
617 read_lock(&dev_base_lock);
618 dev = __dev_get_by_name(net, name);
621 read_unlock(&dev_base_lock);
624 EXPORT_SYMBOL(dev_get_by_name);
627 * __dev_get_by_index - find a device by its ifindex
628 * @net: the applicable net namespace
629 * @ifindex: index of device
631 * Search for an interface by index. Returns %NULL if the device
632 * is not found or a pointer to the device. The device has not
633 * had its reference counter increased so the caller must be careful
634 * about locking. The caller must hold either the RTNL semaphore
638 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
640 struct hlist_node *p;
642 hlist_for_each(p, dev_index_hash(net, ifindex)) {
643 struct net_device *dev
644 = hlist_entry(p, struct net_device, index_hlist);
645 if (dev->ifindex == ifindex)
650 EXPORT_SYMBOL(__dev_get_by_index);
653 * dev_get_by_index_rcu - find a device by its ifindex
654 * @net: the applicable net namespace
655 * @ifindex: index of device
657 * Search for an interface by index. Returns %NULL if the device
658 * is not found or a pointer to the device. The device has not
659 * had its reference counter increased so the caller must be careful
660 * about locking. The caller must hold RCU lock.
663 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
665 struct hlist_node *p;
666 struct net_device *dev;
667 struct hlist_head *head = dev_index_hash(net, ifindex);
669 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
670 if (dev->ifindex == ifindex)
675 EXPORT_SYMBOL(dev_get_by_index_rcu);
679 * dev_get_by_index - find a device by its ifindex
680 * @net: the applicable net namespace
681 * @ifindex: index of device
683 * Search for an interface by index. Returns NULL if the device
684 * is not found or a pointer to the device. The device returned has
685 * had a reference added and the pointer is safe until the user calls
686 * dev_put to indicate they have finished with it.
689 struct net_device *dev_get_by_index(struct net *net, int ifindex)
691 struct net_device *dev;
694 dev = dev_get_by_index_rcu(net, ifindex);
700 EXPORT_SYMBOL(dev_get_by_index);
703 * dev_getbyhwaddr - find a device by its hardware address
704 * @net: the applicable net namespace
705 * @type: media type of device
706 * @ha: hardware address
708 * Search for an interface by MAC address. Returns NULL if the device
709 * is not found or a pointer to the device. The caller must hold the
710 * rtnl semaphore. The returned device has not had its ref count increased
711 * and the caller must therefore be careful about locking
714 * If the API was consistent this would be __dev_get_by_hwaddr
717 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
719 struct net_device *dev;
723 for_each_netdev(net, dev)
724 if (dev->type == type &&
725 !memcmp(dev->dev_addr, ha, dev->addr_len))
730 EXPORT_SYMBOL(dev_getbyhwaddr);
732 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
734 struct net_device *dev;
737 for_each_netdev(net, dev)
738 if (dev->type == type)
743 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
745 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
747 struct net_device *dev;
750 dev = __dev_getfirstbyhwtype(net, type);
756 EXPORT_SYMBOL(dev_getfirstbyhwtype);
759 * dev_get_by_flags - find any device with given flags
760 * @net: the applicable net namespace
761 * @if_flags: IFF_* values
762 * @mask: bitmask of bits in if_flags to check
764 * Search for any interface with the given flags. Returns NULL if a device
765 * is not found or a pointer to the device. The device returned has
766 * had a reference added and the pointer is safe until the user calls
767 * dev_put to indicate they have finished with it.
770 struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
773 struct net_device *dev, *ret;
776 read_lock(&dev_base_lock);
777 for_each_netdev(net, dev) {
778 if (((dev->flags ^ if_flags) & mask) == 0) {
784 read_unlock(&dev_base_lock);
787 EXPORT_SYMBOL(dev_get_by_flags);
790 * dev_valid_name - check if name is okay for network device
793 * Network device names need to be valid file names to
794 * to allow sysfs to work. We also disallow any kind of
797 int dev_valid_name(const char *name)
801 if (strlen(name) >= IFNAMSIZ)
803 if (!strcmp(name, ".") || !strcmp(name, ".."))
807 if (*name == '/' || isspace(*name))
813 EXPORT_SYMBOL(dev_valid_name);
816 * __dev_alloc_name - allocate a name for a device
817 * @net: network namespace to allocate the device name in
818 * @name: name format string
819 * @buf: scratch buffer and result name string
821 * Passed a format string - eg "lt%d" it will try and find a suitable
822 * id. It scans list of devices to build up a free map, then chooses
823 * the first empty slot. The caller must hold the dev_base or rtnl lock
824 * while allocating the name and adding the device in order to avoid
826 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
827 * Returns the number of the unit assigned or a negative errno code.
830 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
834 const int max_netdevices = 8*PAGE_SIZE;
835 unsigned long *inuse;
836 struct net_device *d;
838 p = strnchr(name, IFNAMSIZ-1, '%');
841 * Verify the string as this thing may have come from
842 * the user. There must be either one "%d" and no other "%"
845 if (p[1] != 'd' || strchr(p + 2, '%'))
848 /* Use one page as a bit array of possible slots */
849 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
853 for_each_netdev(net, d) {
854 if (!sscanf(d->name, name, &i))
856 if (i < 0 || i >= max_netdevices)
859 /* avoid cases where sscanf is not exact inverse of printf */
860 snprintf(buf, IFNAMSIZ, name, i);
861 if (!strncmp(buf, d->name, IFNAMSIZ))
865 i = find_first_zero_bit(inuse, max_netdevices);
866 free_page((unsigned long) inuse);
869 snprintf(buf, IFNAMSIZ, name, i);
870 if (!__dev_get_by_name(net, buf))
873 /* It is possible to run out of possible slots
874 * when the name is long and there isn't enough space left
875 * for the digits, or if all bits are used.
881 * dev_alloc_name - allocate a name for a device
883 * @name: name format string
885 * Passed a format string - eg "lt%d" it will try and find a suitable
886 * id. It scans list of devices to build up a free map, then chooses
887 * the first empty slot. The caller must hold the dev_base or rtnl lock
888 * while allocating the name and adding the device in order to avoid
890 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
891 * Returns the number of the unit assigned or a negative errno code.
894 int dev_alloc_name(struct net_device *dev, const char *name)
900 BUG_ON(!dev_net(dev));
902 ret = __dev_alloc_name(net, name, buf);
904 strlcpy(dev->name, buf, IFNAMSIZ);
907 EXPORT_SYMBOL(dev_alloc_name);
911 * dev_change_name - change name of a device
913 * @newname: name (or format string) must be at least IFNAMSIZ
915 * Change name of a device, can pass format strings "eth%d".
918 int dev_change_name(struct net_device *dev, const char *newname)
920 char oldname[IFNAMSIZ];
926 BUG_ON(!dev_net(dev));
929 if (dev->flags & IFF_UP)
932 if (!dev_valid_name(newname))
935 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
938 memcpy(oldname, dev->name, IFNAMSIZ);
940 if (strchr(newname, '%')) {
941 err = dev_alloc_name(dev, newname);
944 } else if (__dev_get_by_name(net, newname))
947 strlcpy(dev->name, newname, IFNAMSIZ);
950 /* For now only devices in the initial network namespace
953 if (net == &init_net) {
954 ret = device_rename(&dev->dev, dev->name);
956 memcpy(dev->name, oldname, IFNAMSIZ);
961 write_lock_bh(&dev_base_lock);
962 hlist_del(&dev->name_hlist);
963 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
964 write_unlock_bh(&dev_base_lock);
966 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
967 ret = notifier_to_errno(ret);
972 "%s: name change rollback failed: %d.\n",
976 memcpy(dev->name, oldname, IFNAMSIZ);
985 * dev_set_alias - change ifalias of a device
987 * @alias: name up to IFALIASZ
988 * @len: limit of bytes to copy from info
990 * Set ifalias for a device,
992 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1001 kfree(dev->ifalias);
1002 dev->ifalias = NULL;
1007 dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1011 strlcpy(dev->ifalias, alias, len+1);
1017 * netdev_features_change - device changes features
1018 * @dev: device to cause notification
1020 * Called to indicate a device has changed features.
1022 void netdev_features_change(struct net_device *dev)
1024 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1026 EXPORT_SYMBOL(netdev_features_change);
1029 * netdev_state_change - device changes state
1030 * @dev: device to cause notification
1032 * Called to indicate a device has changed state. This function calls
1033 * the notifier chains for netdev_chain and sends a NEWLINK message
1034 * to the routing socket.
1036 void netdev_state_change(struct net_device *dev)
1038 if (dev->flags & IFF_UP) {
1039 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1040 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1043 EXPORT_SYMBOL(netdev_state_change);
1045 void netdev_bonding_change(struct net_device *dev, unsigned long event)
1047 call_netdevice_notifiers(event, dev);
1049 EXPORT_SYMBOL(netdev_bonding_change);
1052 * dev_load - load a network module
1053 * @net: the applicable net namespace
1054 * @name: name of interface
1056 * If a network interface is not present and the process has suitable
1057 * privileges this function loads the module. If module loading is not
1058 * available in this kernel then it becomes a nop.
1061 void dev_load(struct net *net, const char *name)
1063 struct net_device *dev;
1065 read_lock(&dev_base_lock);
1066 dev = __dev_get_by_name(net, name);
1067 read_unlock(&dev_base_lock);
1069 if (!dev && capable(CAP_NET_ADMIN))
1070 request_module("%s", name);
1072 EXPORT_SYMBOL(dev_load);
1075 * dev_open - prepare an interface for use.
1076 * @dev: device to open
1078 * Takes a device from down to up state. The device's private open
1079 * function is invoked and then the multicast lists are loaded. Finally
1080 * the device is moved into the up state and a %NETDEV_UP message is
1081 * sent to the netdev notifier chain.
1083 * Calling this function on an active interface is a nop. On a failure
1084 * a negative errno code is returned.
1086 int dev_open(struct net_device *dev)
1088 const struct net_device_ops *ops = dev->netdev_ops;
1097 if (dev->flags & IFF_UP)
1101 * Is it even present?
1103 if (!netif_device_present(dev))
1106 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1107 ret = notifier_to_errno(ret);
1112 * Call device private open method
1114 set_bit(__LINK_STATE_START, &dev->state);
1116 if (ops->ndo_validate_addr)
1117 ret = ops->ndo_validate_addr(dev);
1119 if (!ret && ops->ndo_open)
1120 ret = ops->ndo_open(dev);
1123 * If it went open OK then:
1127 clear_bit(__LINK_STATE_START, &dev->state);
1132 dev->flags |= IFF_UP;
1137 net_dmaengine_get();
1140 * Initialize multicasting status
1142 dev_set_rx_mode(dev);
1145 * Wakeup transmit queue engine
1150 * ... and announce new interface.
1152 call_netdevice_notifiers(NETDEV_UP, dev);
1157 EXPORT_SYMBOL(dev_open);
1160 * dev_close - shutdown an interface.
1161 * @dev: device to shutdown
1163 * This function moves an active device into down state. A
1164 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1165 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1168 int dev_close(struct net_device *dev)
1170 const struct net_device_ops *ops = dev->netdev_ops;
1175 if (!(dev->flags & IFF_UP))
1179 * Tell people we are going down, so that they can
1180 * prepare to death, when device is still operating.
1182 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1184 clear_bit(__LINK_STATE_START, &dev->state);
1186 /* Synchronize to scheduled poll. We cannot touch poll list,
1187 * it can be even on different cpu. So just clear netif_running().
1189 * dev->stop() will invoke napi_disable() on all of it's
1190 * napi_struct instances on this device.
1192 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1194 dev_deactivate(dev);
1197 * Call the device specific close. This cannot fail.
1198 * Only if device is UP
1200 * We allow it to be called even after a DETACH hot-plug
1207 * Device is now down.
1210 dev->flags &= ~IFF_UP;
1213 * Tell people we are down
1215 call_netdevice_notifiers(NETDEV_DOWN, dev);
1220 net_dmaengine_put();
1224 EXPORT_SYMBOL(dev_close);
1228 * dev_disable_lro - disable Large Receive Offload on a device
1231 * Disable Large Receive Offload (LRO) on a net device. Must be
1232 * called under RTNL. This is needed if received packets may be
1233 * forwarded to another interface.
1235 void dev_disable_lro(struct net_device *dev)
1237 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1238 dev->ethtool_ops->set_flags) {
1239 u32 flags = dev->ethtool_ops->get_flags(dev);
1240 if (flags & ETH_FLAG_LRO) {
1241 flags &= ~ETH_FLAG_LRO;
1242 dev->ethtool_ops->set_flags(dev, flags);
1245 WARN_ON(dev->features & NETIF_F_LRO);
1247 EXPORT_SYMBOL(dev_disable_lro);
1250 static int dev_boot_phase = 1;
1253 * Device change register/unregister. These are not inline or static
1254 * as we export them to the world.
1258 * register_netdevice_notifier - register a network notifier block
1261 * Register a notifier to be called when network device events occur.
1262 * The notifier passed is linked into the kernel structures and must
1263 * not be reused until it has been unregistered. A negative errno code
1264 * is returned on a failure.
1266 * When registered all registration and up events are replayed
1267 * to the new notifier to allow device to have a race free
1268 * view of the network device list.
1271 int register_netdevice_notifier(struct notifier_block *nb)
1273 struct net_device *dev;
1274 struct net_device *last;
1279 err = raw_notifier_chain_register(&netdev_chain, nb);
1285 for_each_netdev(net, dev) {
1286 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1287 err = notifier_to_errno(err);
1291 if (!(dev->flags & IFF_UP))
1294 nb->notifier_call(nb, NETDEV_UP, dev);
1305 for_each_netdev(net, dev) {
1309 if (dev->flags & IFF_UP) {
1310 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1311 nb->notifier_call(nb, NETDEV_DOWN, dev);
1313 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1317 raw_notifier_chain_unregister(&netdev_chain, nb);
1320 EXPORT_SYMBOL(register_netdevice_notifier);
1323 * unregister_netdevice_notifier - unregister a network notifier block
1326 * Unregister a notifier previously registered by
1327 * register_netdevice_notifier(). The notifier is unlinked into the
1328 * kernel structures and may then be reused. A negative errno code
1329 * is returned on a failure.
1332 int unregister_netdevice_notifier(struct notifier_block *nb)
1337 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1341 EXPORT_SYMBOL(unregister_netdevice_notifier);
1344 * call_netdevice_notifiers - call all network notifier blocks
1345 * @val: value passed unmodified to notifier function
1346 * @dev: net_device pointer passed unmodified to notifier function
1348 * Call all network notifier blocks. Parameters and return value
1349 * are as for raw_notifier_call_chain().
1352 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1354 return raw_notifier_call_chain(&netdev_chain, val, dev);
1357 /* When > 0 there are consumers of rx skb time stamps */
1358 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1360 void net_enable_timestamp(void)
1362 atomic_inc(&netstamp_needed);
1364 EXPORT_SYMBOL(net_enable_timestamp);
1366 void net_disable_timestamp(void)
1368 atomic_dec(&netstamp_needed);
1370 EXPORT_SYMBOL(net_disable_timestamp);
1372 static inline void net_timestamp(struct sk_buff *skb)
1374 if (atomic_read(&netstamp_needed))
1375 __net_timestamp(skb);
1377 skb->tstamp.tv64 = 0;
1381 * Support routine. Sends outgoing frames to any network
1382 * taps currently in use.
1385 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1387 struct packet_type *ptype;
1389 #ifdef CONFIG_NET_CLS_ACT
1390 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1397 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1398 /* Never send packets back to the socket
1399 * they originated from - MvS (miquels@drinkel.ow.org)
1401 if ((ptype->dev == dev || !ptype->dev) &&
1402 (ptype->af_packet_priv == NULL ||
1403 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1404 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1408 /* skb->nh should be correctly
1409 set by sender, so that the second statement is
1410 just protection against buggy protocols.
1412 skb_reset_mac_header(skb2);
1414 if (skb_network_header(skb2) < skb2->data ||
1415 skb2->network_header > skb2->tail) {
1416 if (net_ratelimit())
1417 printk(KERN_CRIT "protocol %04x is "
1419 skb2->protocol, dev->name);
1420 skb_reset_network_header(skb2);
1423 skb2->transport_header = skb2->network_header;
1424 skb2->pkt_type = PACKET_OUTGOING;
1425 ptype->func(skb2, skb->dev, ptype, skb->dev);
1432 static inline void __netif_reschedule(struct Qdisc *q)
1434 struct softnet_data *sd;
1435 unsigned long flags;
1437 local_irq_save(flags);
1438 sd = &__get_cpu_var(softnet_data);
1439 q->next_sched = sd->output_queue;
1440 sd->output_queue = q;
1441 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1442 local_irq_restore(flags);
1445 void __netif_schedule(struct Qdisc *q)
1447 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1448 __netif_reschedule(q);
1450 EXPORT_SYMBOL(__netif_schedule);
1452 void dev_kfree_skb_irq(struct sk_buff *skb)
1454 if (atomic_dec_and_test(&skb->users)) {
1455 struct softnet_data *sd;
1456 unsigned long flags;
1458 local_irq_save(flags);
1459 sd = &__get_cpu_var(softnet_data);
1460 skb->next = sd->completion_queue;
1461 sd->completion_queue = skb;
1462 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1463 local_irq_restore(flags);
1466 EXPORT_SYMBOL(dev_kfree_skb_irq);
1468 void dev_kfree_skb_any(struct sk_buff *skb)
1470 if (in_irq() || irqs_disabled())
1471 dev_kfree_skb_irq(skb);
1475 EXPORT_SYMBOL(dev_kfree_skb_any);
1479 * netif_device_detach - mark device as removed
1480 * @dev: network device
1482 * Mark device as removed from system and therefore no longer available.
1484 void netif_device_detach(struct net_device *dev)
1486 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1487 netif_running(dev)) {
1488 netif_tx_stop_all_queues(dev);
1491 EXPORT_SYMBOL(netif_device_detach);
1494 * netif_device_attach - mark device as attached
1495 * @dev: network device
1497 * Mark device as attached from system and restart if needed.
1499 void netif_device_attach(struct net_device *dev)
1501 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1502 netif_running(dev)) {
1503 netif_tx_wake_all_queues(dev);
1504 __netdev_watchdog_up(dev);
1507 EXPORT_SYMBOL(netif_device_attach);
1509 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1511 return ((features & NETIF_F_GEN_CSUM) ||
1512 ((features & NETIF_F_IP_CSUM) &&
1513 protocol == htons(ETH_P_IP)) ||
1514 ((features & NETIF_F_IPV6_CSUM) &&
1515 protocol == htons(ETH_P_IPV6)) ||
1516 ((features & NETIF_F_FCOE_CRC) &&
1517 protocol == htons(ETH_P_FCOE)));
1520 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1522 if (can_checksum_protocol(dev->features, skb->protocol))
1525 if (skb->protocol == htons(ETH_P_8021Q)) {
1526 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1527 if (can_checksum_protocol(dev->features & dev->vlan_features,
1528 veh->h_vlan_encapsulated_proto))
1536 * Invalidate hardware checksum when packet is to be mangled, and
1537 * complete checksum manually on outgoing path.
1539 int skb_checksum_help(struct sk_buff *skb)
1542 int ret = 0, offset;
1544 if (skb->ip_summed == CHECKSUM_COMPLETE)
1545 goto out_set_summed;
1547 if (unlikely(skb_shinfo(skb)->gso_size)) {
1548 /* Let GSO fix up the checksum. */
1549 goto out_set_summed;
1552 offset = skb->csum_start - skb_headroom(skb);
1553 BUG_ON(offset >= skb_headlen(skb));
1554 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1556 offset += skb->csum_offset;
1557 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1559 if (skb_cloned(skb) &&
1560 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1561 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1566 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1568 skb->ip_summed = CHECKSUM_NONE;
1572 EXPORT_SYMBOL(skb_checksum_help);
1575 * skb_gso_segment - Perform segmentation on skb.
1576 * @skb: buffer to segment
1577 * @features: features for the output path (see dev->features)
1579 * This function segments the given skb and returns a list of segments.
1581 * It may return NULL if the skb requires no segmentation. This is
1582 * only possible when GSO is used for verifying header integrity.
1584 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1586 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1587 struct packet_type *ptype;
1588 __be16 type = skb->protocol;
1591 skb_reset_mac_header(skb);
1592 skb->mac_len = skb->network_header - skb->mac_header;
1593 __skb_pull(skb, skb->mac_len);
1595 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1596 struct net_device *dev = skb->dev;
1597 struct ethtool_drvinfo info = {};
1599 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1600 dev->ethtool_ops->get_drvinfo(dev, &info);
1602 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1604 info.driver, dev ? dev->features : 0L,
1605 skb->sk ? skb->sk->sk_route_caps : 0L,
1606 skb->len, skb->data_len, skb->ip_summed);
1608 if (skb_header_cloned(skb) &&
1609 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1610 return ERR_PTR(err);
1614 list_for_each_entry_rcu(ptype,
1615 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1616 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1617 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1618 err = ptype->gso_send_check(skb);
1619 segs = ERR_PTR(err);
1620 if (err || skb_gso_ok(skb, features))
1622 __skb_push(skb, (skb->data -
1623 skb_network_header(skb)));
1625 segs = ptype->gso_segment(skb, features);
1631 __skb_push(skb, skb->data - skb_mac_header(skb));
1635 EXPORT_SYMBOL(skb_gso_segment);
1637 /* Take action when hardware reception checksum errors are detected. */
1639 void netdev_rx_csum_fault(struct net_device *dev)
1641 if (net_ratelimit()) {
1642 printk(KERN_ERR "%s: hw csum failure.\n",
1643 dev ? dev->name : "<unknown>");
1647 EXPORT_SYMBOL(netdev_rx_csum_fault);
1650 /* Actually, we should eliminate this check as soon as we know, that:
1651 * 1. IOMMU is present and allows to map all the memory.
1652 * 2. No high memory really exists on this machine.
1655 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1657 #ifdef CONFIG_HIGHMEM
1660 if (dev->features & NETIF_F_HIGHDMA)
1663 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1664 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1672 void (*destructor)(struct sk_buff *skb);
1675 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1677 static void dev_gso_skb_destructor(struct sk_buff *skb)
1679 struct dev_gso_cb *cb;
1682 struct sk_buff *nskb = skb->next;
1684 skb->next = nskb->next;
1687 } while (skb->next);
1689 cb = DEV_GSO_CB(skb);
1691 cb->destructor(skb);
1695 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1696 * @skb: buffer to segment
1698 * This function segments the given skb and stores the list of segments
1701 static int dev_gso_segment(struct sk_buff *skb)
1703 struct net_device *dev = skb->dev;
1704 struct sk_buff *segs;
1705 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1708 segs = skb_gso_segment(skb, features);
1710 /* Verifying header integrity only. */
1715 return PTR_ERR(segs);
1718 DEV_GSO_CB(skb)->destructor = skb->destructor;
1719 skb->destructor = dev_gso_skb_destructor;
1724 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1725 struct netdev_queue *txq)
1727 const struct net_device_ops *ops = dev->netdev_ops;
1730 if (likely(!skb->next)) {
1731 if (!list_empty(&ptype_all))
1732 dev_queue_xmit_nit(skb, dev);
1734 if (netif_needs_gso(dev, skb)) {
1735 if (unlikely(dev_gso_segment(skb)))
1742 * If device doesnt need skb->dst, release it right now while
1743 * its hot in this cpu cache
1745 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1748 rc = ops->ndo_start_xmit(skb, dev);
1749 if (rc == NETDEV_TX_OK)
1750 txq_trans_update(txq);
1752 * TODO: if skb_orphan() was called by
1753 * dev->hard_start_xmit() (for example, the unmodified
1754 * igb driver does that; bnx2 doesn't), then
1755 * skb_tx_software_timestamp() will be unable to send
1756 * back the time stamp.
1758 * How can this be prevented? Always create another
1759 * reference to the socket before calling
1760 * dev->hard_start_xmit()? Prevent that skb_orphan()
1761 * does anything in dev->hard_start_xmit() by clearing
1762 * the skb destructor before the call and restoring it
1763 * afterwards, then doing the skb_orphan() ourselves?
1770 struct sk_buff *nskb = skb->next;
1772 skb->next = nskb->next;
1774 rc = ops->ndo_start_xmit(nskb, dev);
1775 if (unlikely(rc != NETDEV_TX_OK)) {
1776 nskb->next = skb->next;
1780 txq_trans_update(txq);
1781 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1782 return NETDEV_TX_BUSY;
1783 } while (skb->next);
1785 skb->destructor = DEV_GSO_CB(skb)->destructor;
1789 return NETDEV_TX_OK;
1792 static u32 skb_tx_hashrnd;
1794 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1798 if (skb_rx_queue_recorded(skb)) {
1799 hash = skb_get_rx_queue(skb);
1800 while (unlikely(hash >= dev->real_num_tx_queues))
1801 hash -= dev->real_num_tx_queues;
1805 if (skb->sk && skb->sk->sk_hash)
1806 hash = skb->sk->sk_hash;
1808 hash = skb->protocol;
1810 hash = jhash_1word(hash, skb_tx_hashrnd);
1812 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1814 EXPORT_SYMBOL(skb_tx_hash);
1816 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
1817 struct sk_buff *skb)
1820 struct sock *sk = skb->sk;
1822 if (sk_tx_queue_recorded(sk)) {
1823 queue_index = sk_tx_queue_get(sk);
1825 const struct net_device_ops *ops = dev->netdev_ops;
1827 if (ops->ndo_select_queue) {
1828 queue_index = ops->ndo_select_queue(dev, skb);
1831 if (dev->real_num_tx_queues > 1)
1832 queue_index = skb_tx_hash(dev, skb);
1834 if (sk && sk->sk_dst_cache)
1835 sk_tx_queue_set(sk, queue_index);
1839 skb_set_queue_mapping(skb, queue_index);
1840 return netdev_get_tx_queue(dev, queue_index);
1843 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
1844 struct net_device *dev,
1845 struct netdev_queue *txq)
1847 spinlock_t *root_lock = qdisc_lock(q);
1850 spin_lock(root_lock);
1851 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
1854 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
1855 !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
1857 * This is a work-conserving queue; there are no old skbs
1858 * waiting to be sent out; and the qdisc is not running -
1859 * xmit the skb directly.
1861 __qdisc_update_bstats(q, skb->len);
1862 if (sch_direct_xmit(skb, q, dev, txq, root_lock))
1865 clear_bit(__QDISC_STATE_RUNNING, &q->state);
1867 rc = NET_XMIT_SUCCESS;
1869 rc = qdisc_enqueue_root(skb, q);
1872 spin_unlock(root_lock);
1878 * dev_queue_xmit - transmit a buffer
1879 * @skb: buffer to transmit
1881 * Queue a buffer for transmission to a network device. The caller must
1882 * have set the device and priority and built the buffer before calling
1883 * this function. The function can be called from an interrupt.
1885 * A negative errno code is returned on a failure. A success does not
1886 * guarantee the frame will be transmitted as it may be dropped due
1887 * to congestion or traffic shaping.
1889 * -----------------------------------------------------------------------------------
1890 * I notice this method can also return errors from the queue disciplines,
1891 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1894 * Regardless of the return value, the skb is consumed, so it is currently
1895 * difficult to retry a send to this method. (You can bump the ref count
1896 * before sending to hold a reference for retry if you are careful.)
1898 * When calling this method, interrupts MUST be enabled. This is because
1899 * the BH enable code must have IRQs enabled so that it will not deadlock.
1902 int dev_queue_xmit(struct sk_buff *skb)
1904 struct net_device *dev = skb->dev;
1905 struct netdev_queue *txq;
1909 /* GSO will handle the following emulations directly. */
1910 if (netif_needs_gso(dev, skb))
1913 if (skb_has_frags(skb) &&
1914 !(dev->features & NETIF_F_FRAGLIST) &&
1915 __skb_linearize(skb))
1918 /* Fragmented skb is linearized if device does not support SG,
1919 * or if at least one of fragments is in highmem and device
1920 * does not support DMA from it.
1922 if (skb_shinfo(skb)->nr_frags &&
1923 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1924 __skb_linearize(skb))
1927 /* If packet is not checksummed and device does not support
1928 * checksumming for this protocol, complete checksumming here.
1930 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1931 skb_set_transport_header(skb, skb->csum_start -
1933 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
1938 /* Disable soft irqs for various locks below. Also
1939 * stops preemption for RCU.
1943 txq = dev_pick_tx(dev, skb);
1944 q = rcu_dereference(txq->qdisc);
1946 #ifdef CONFIG_NET_CLS_ACT
1947 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
1950 rc = __dev_xmit_skb(skb, q, dev, txq);
1954 /* The device has no queue. Common case for software devices:
1955 loopback, all the sorts of tunnels...
1957 Really, it is unlikely that netif_tx_lock protection is necessary
1958 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1960 However, it is possible, that they rely on protection
1963 Check this and shot the lock. It is not prone from deadlocks.
1964 Either shot noqueue qdisc, it is even simpler 8)
1966 if (dev->flags & IFF_UP) {
1967 int cpu = smp_processor_id(); /* ok because BHs are off */
1969 if (txq->xmit_lock_owner != cpu) {
1971 HARD_TX_LOCK(dev, txq, cpu);
1973 if (!netif_tx_queue_stopped(txq)) {
1974 rc = NET_XMIT_SUCCESS;
1975 if (!dev_hard_start_xmit(skb, dev, txq)) {
1976 HARD_TX_UNLOCK(dev, txq);
1980 HARD_TX_UNLOCK(dev, txq);
1981 if (net_ratelimit())
1982 printk(KERN_CRIT "Virtual device %s asks to "
1983 "queue packet!\n", dev->name);
1985 /* Recursion is detected! It is possible,
1987 if (net_ratelimit())
1988 printk(KERN_CRIT "Dead loop on virtual device "
1989 "%s, fix it urgently!\n", dev->name);
1994 rcu_read_unlock_bh();
2000 rcu_read_unlock_bh();
2003 EXPORT_SYMBOL(dev_queue_xmit);
2006 /*=======================================================================
2008 =======================================================================*/
2010 int netdev_max_backlog __read_mostly = 1000;
2011 int netdev_budget __read_mostly = 300;
2012 int weight_p __read_mostly = 64; /* old backlog weight */
2014 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
2018 * netif_rx - post buffer to the network code
2019 * @skb: buffer to post
2021 * This function receives a packet from a device driver and queues it for
2022 * the upper (protocol) levels to process. It always succeeds. The buffer
2023 * may be dropped during processing for congestion control or by the
2027 * NET_RX_SUCCESS (no congestion)
2028 * NET_RX_DROP (packet was dropped)
2032 int netif_rx(struct sk_buff *skb)
2034 struct softnet_data *queue;
2035 unsigned long flags;
2037 /* if netpoll wants it, pretend we never saw it */
2038 if (netpoll_rx(skb))
2041 if (!skb->tstamp.tv64)
2045 * The code is rearranged so that the path is the most
2046 * short when CPU is congested, but is still operating.
2048 local_irq_save(flags);
2049 queue = &__get_cpu_var(softnet_data);
2051 __get_cpu_var(netdev_rx_stat).total++;
2052 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
2053 if (queue->input_pkt_queue.qlen) {
2055 __skb_queue_tail(&queue->input_pkt_queue, skb);
2056 local_irq_restore(flags);
2057 return NET_RX_SUCCESS;
2060 napi_schedule(&queue->backlog);
2064 __get_cpu_var(netdev_rx_stat).dropped++;
2065 local_irq_restore(flags);
2070 EXPORT_SYMBOL(netif_rx);
2072 int netif_rx_ni(struct sk_buff *skb)
2077 err = netif_rx(skb);
2078 if (local_softirq_pending())
2084 EXPORT_SYMBOL(netif_rx_ni);
2086 static void net_tx_action(struct softirq_action *h)
2088 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2090 if (sd->completion_queue) {
2091 struct sk_buff *clist;
2093 local_irq_disable();
2094 clist = sd->completion_queue;
2095 sd->completion_queue = NULL;
2099 struct sk_buff *skb = clist;
2100 clist = clist->next;
2102 WARN_ON(atomic_read(&skb->users));
2107 if (sd->output_queue) {
2110 local_irq_disable();
2111 head = sd->output_queue;
2112 sd->output_queue = NULL;
2116 struct Qdisc *q = head;
2117 spinlock_t *root_lock;
2119 head = head->next_sched;
2121 root_lock = qdisc_lock(q);
2122 if (spin_trylock(root_lock)) {
2123 smp_mb__before_clear_bit();
2124 clear_bit(__QDISC_STATE_SCHED,
2127 spin_unlock(root_lock);
2129 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2131 __netif_reschedule(q);
2133 smp_mb__before_clear_bit();
2134 clear_bit(__QDISC_STATE_SCHED,
2142 static inline int deliver_skb(struct sk_buff *skb,
2143 struct packet_type *pt_prev,
2144 struct net_device *orig_dev)
2146 atomic_inc(&skb->users);
2147 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2150 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2152 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
2153 /* This hook is defined here for ATM LANE */
2154 int (*br_fdb_test_addr_hook)(struct net_device *dev,
2155 unsigned char *addr) __read_mostly;
2156 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2160 * If bridge module is loaded call bridging hook.
2161 * returns NULL if packet was consumed.
2163 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2164 struct sk_buff *skb) __read_mostly;
2165 EXPORT_SYMBOL_GPL(br_handle_frame_hook);
2167 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2168 struct packet_type **pt_prev, int *ret,
2169 struct net_device *orig_dev)
2171 struct net_bridge_port *port;
2173 if (skb->pkt_type == PACKET_LOOPBACK ||
2174 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2178 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2182 return br_handle_frame_hook(port, skb);
2185 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2188 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2189 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2190 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2192 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2193 struct packet_type **pt_prev,
2195 struct net_device *orig_dev)
2197 if (skb->dev->macvlan_port == NULL)
2201 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2204 return macvlan_handle_frame_hook(skb);
2207 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2210 #ifdef CONFIG_NET_CLS_ACT
2211 /* TODO: Maybe we should just force sch_ingress to be compiled in
2212 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2213 * a compare and 2 stores extra right now if we dont have it on
2214 * but have CONFIG_NET_CLS_ACT
2215 * NOTE: This doesnt stop any functionality; if you dont have
2216 * the ingress scheduler, you just cant add policies on ingress.
2219 static int ing_filter(struct sk_buff *skb)
2221 struct net_device *dev = skb->dev;
2222 u32 ttl = G_TC_RTTL(skb->tc_verd);
2223 struct netdev_queue *rxq;
2224 int result = TC_ACT_OK;
2227 if (MAX_RED_LOOP < ttl++) {
2229 "Redir loop detected Dropping packet (%d->%d)\n",
2230 skb->iif, dev->ifindex);
2234 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2235 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2237 rxq = &dev->rx_queue;
2240 if (q != &noop_qdisc) {
2241 spin_lock(qdisc_lock(q));
2242 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2243 result = qdisc_enqueue_root(skb, q);
2244 spin_unlock(qdisc_lock(q));
2250 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2251 struct packet_type **pt_prev,
2252 int *ret, struct net_device *orig_dev)
2254 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2258 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2261 /* Huh? Why does turning on AF_PACKET affect this? */
2262 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2265 switch (ing_filter(skb)) {
2279 * netif_nit_deliver - deliver received packets to network taps
2282 * This function is used to deliver incoming packets to network
2283 * taps. It should be used when the normal netif_receive_skb path
2284 * is bypassed, for example because of VLAN acceleration.
2286 void netif_nit_deliver(struct sk_buff *skb)
2288 struct packet_type *ptype;
2290 if (list_empty(&ptype_all))
2293 skb_reset_network_header(skb);
2294 skb_reset_transport_header(skb);
2295 skb->mac_len = skb->network_header - skb->mac_header;
2298 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2299 if (!ptype->dev || ptype->dev == skb->dev)
2300 deliver_skb(skb, ptype, skb->dev);
2306 * netif_receive_skb - process receive buffer from network
2307 * @skb: buffer to process
2309 * netif_receive_skb() is the main receive data processing function.
2310 * It always succeeds. The buffer may be dropped during processing
2311 * for congestion control or by the protocol layers.
2313 * This function may only be called from softirq context and interrupts
2314 * should be enabled.
2316 * Return values (usually ignored):
2317 * NET_RX_SUCCESS: no congestion
2318 * NET_RX_DROP: packet was dropped
2320 int netif_receive_skb(struct sk_buff *skb)
2322 struct packet_type *ptype, *pt_prev;
2323 struct net_device *orig_dev;
2324 struct net_device *null_or_orig;
2325 int ret = NET_RX_DROP;
2328 if (!skb->tstamp.tv64)
2331 if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2332 return NET_RX_SUCCESS;
2334 /* if we've gotten here through NAPI, check netpoll */
2335 if (netpoll_receive_skb(skb))
2339 skb->iif = skb->dev->ifindex;
2341 null_or_orig = NULL;
2342 orig_dev = skb->dev;
2343 if (orig_dev->master) {
2344 if (skb_bond_should_drop(skb))
2345 null_or_orig = orig_dev; /* deliver only exact match */
2347 skb->dev = orig_dev->master;
2350 __get_cpu_var(netdev_rx_stat).total++;
2352 skb_reset_network_header(skb);
2353 skb_reset_transport_header(skb);
2354 skb->mac_len = skb->network_header - skb->mac_header;
2360 #ifdef CONFIG_NET_CLS_ACT
2361 if (skb->tc_verd & TC_NCLS) {
2362 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2367 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2368 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2369 ptype->dev == orig_dev) {
2371 ret = deliver_skb(skb, pt_prev, orig_dev);
2376 #ifdef CONFIG_NET_CLS_ACT
2377 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2383 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2386 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2390 type = skb->protocol;
2391 list_for_each_entry_rcu(ptype,
2392 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2393 if (ptype->type == type &&
2394 (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2395 ptype->dev == orig_dev)) {
2397 ret = deliver_skb(skb, pt_prev, orig_dev);
2403 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2406 /* Jamal, now you will not able to escape explaining
2407 * me how you were going to use this. :-)
2416 EXPORT_SYMBOL(netif_receive_skb);
2418 /* Network device is going away, flush any packets still pending */
2419 static void flush_backlog(void *arg)
2421 struct net_device *dev = arg;
2422 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2423 struct sk_buff *skb, *tmp;
2425 skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp)
2426 if (skb->dev == dev) {
2427 __skb_unlink(skb, &queue->input_pkt_queue);
2432 static int napi_gro_complete(struct sk_buff *skb)
2434 struct packet_type *ptype;
2435 __be16 type = skb->protocol;
2436 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2439 if (NAPI_GRO_CB(skb)->count == 1) {
2440 skb_shinfo(skb)->gso_size = 0;
2445 list_for_each_entry_rcu(ptype, head, list) {
2446 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2449 err = ptype->gro_complete(skb);
2455 WARN_ON(&ptype->list == head);
2457 return NET_RX_SUCCESS;
2461 return netif_receive_skb(skb);
2464 void napi_gro_flush(struct napi_struct *napi)
2466 struct sk_buff *skb, *next;
2468 for (skb = napi->gro_list; skb; skb = next) {
2471 napi_gro_complete(skb);
2474 napi->gro_count = 0;
2475 napi->gro_list = NULL;
2477 EXPORT_SYMBOL(napi_gro_flush);
2479 enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2481 struct sk_buff **pp = NULL;
2482 struct packet_type *ptype;
2483 __be16 type = skb->protocol;
2484 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2487 enum gro_result ret;
2489 if (!(skb->dev->features & NETIF_F_GRO))
2492 if (skb_is_gso(skb) || skb_has_frags(skb))
2496 list_for_each_entry_rcu(ptype, head, list) {
2497 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
2500 skb_set_network_header(skb, skb_gro_offset(skb));
2501 mac_len = skb->network_header - skb->mac_header;
2502 skb->mac_len = mac_len;
2503 NAPI_GRO_CB(skb)->same_flow = 0;
2504 NAPI_GRO_CB(skb)->flush = 0;
2505 NAPI_GRO_CB(skb)->free = 0;
2507 pp = ptype->gro_receive(&napi->gro_list, skb);
2512 if (&ptype->list == head)
2515 same_flow = NAPI_GRO_CB(skb)->same_flow;
2516 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
2519 struct sk_buff *nskb = *pp;
2523 napi_gro_complete(nskb);
2530 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
2534 NAPI_GRO_CB(skb)->count = 1;
2535 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
2536 skb->next = napi->gro_list;
2537 napi->gro_list = skb;
2541 if (skb_headlen(skb) < skb_gro_offset(skb)) {
2542 int grow = skb_gro_offset(skb) - skb_headlen(skb);
2544 BUG_ON(skb->end - skb->tail < grow);
2546 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
2549 skb->data_len -= grow;
2551 skb_shinfo(skb)->frags[0].page_offset += grow;
2552 skb_shinfo(skb)->frags[0].size -= grow;
2554 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
2555 put_page(skb_shinfo(skb)->frags[0].page);
2556 memmove(skb_shinfo(skb)->frags,
2557 skb_shinfo(skb)->frags + 1,
2558 --skb_shinfo(skb)->nr_frags);
2569 EXPORT_SYMBOL(dev_gro_receive);
2572 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2576 if (netpoll_rx_on(skb))
2579 for (p = napi->gro_list; p; p = p->next) {
2580 NAPI_GRO_CB(p)->same_flow = (p->dev == skb->dev)
2581 && !compare_ether_header(skb_mac_header(p),
2582 skb_gro_mac_header(skb));
2583 NAPI_GRO_CB(p)->flush = 0;
2586 return dev_gro_receive(napi, skb);
2589 int napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
2591 int err = NET_RX_SUCCESS;
2595 return netif_receive_skb(skb);
2601 case GRO_MERGED_FREE:
2612 EXPORT_SYMBOL(napi_skb_finish);
2614 void skb_gro_reset_offset(struct sk_buff *skb)
2616 NAPI_GRO_CB(skb)->data_offset = 0;
2617 NAPI_GRO_CB(skb)->frag0 = NULL;
2618 NAPI_GRO_CB(skb)->frag0_len = 0;
2620 if (skb->mac_header == skb->tail &&
2621 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
2622 NAPI_GRO_CB(skb)->frag0 =
2623 page_address(skb_shinfo(skb)->frags[0].page) +
2624 skb_shinfo(skb)->frags[0].page_offset;
2625 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
2628 EXPORT_SYMBOL(skb_gro_reset_offset);
2630 int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2632 skb_gro_reset_offset(skb);
2634 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
2636 EXPORT_SYMBOL(napi_gro_receive);
2638 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
2640 __skb_pull(skb, skb_headlen(skb));
2641 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
2645 EXPORT_SYMBOL(napi_reuse_skb);
2647 struct sk_buff *napi_get_frags(struct napi_struct *napi)
2649 struct sk_buff *skb = napi->skb;
2652 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
2658 EXPORT_SYMBOL(napi_get_frags);
2660 int napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
2663 int err = NET_RX_SUCCESS;
2668 skb->protocol = eth_type_trans(skb, napi->dev);
2670 if (ret == GRO_NORMAL)
2671 return netif_receive_skb(skb);
2673 skb_gro_pull(skb, -ETH_HLEN);
2680 case GRO_MERGED_FREE:
2681 napi_reuse_skb(napi, skb);
2690 EXPORT_SYMBOL(napi_frags_finish);
2692 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
2694 struct sk_buff *skb = napi->skb;
2701 skb_reset_mac_header(skb);
2702 skb_gro_reset_offset(skb);
2704 off = skb_gro_offset(skb);
2705 hlen = off + sizeof(*eth);
2706 eth = skb_gro_header_fast(skb, off);
2707 if (skb_gro_header_hard(skb, hlen)) {
2708 eth = skb_gro_header_slow(skb, hlen, off);
2709 if (unlikely(!eth)) {
2710 napi_reuse_skb(napi, skb);
2716 skb_gro_pull(skb, sizeof(*eth));
2719 * This works because the only protocols we care about don't require
2720 * special handling. We'll fix it up properly at the end.
2722 skb->protocol = eth->h_proto;
2727 EXPORT_SYMBOL(napi_frags_skb);
2729 int napi_gro_frags(struct napi_struct *napi)
2731 struct sk_buff *skb = napi_frags_skb(napi);
2736 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
2738 EXPORT_SYMBOL(napi_gro_frags);
2740 static int process_backlog(struct napi_struct *napi, int quota)
2743 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2744 unsigned long start_time = jiffies;
2746 napi->weight = weight_p;
2748 struct sk_buff *skb;
2750 local_irq_disable();
2751 skb = __skb_dequeue(&queue->input_pkt_queue);
2753 __napi_complete(napi);
2759 netif_receive_skb(skb);
2760 } while (++work < quota && jiffies == start_time);
2766 * __napi_schedule - schedule for receive
2767 * @n: entry to schedule
2769 * The entry's receive function will be scheduled to run
2771 void __napi_schedule(struct napi_struct *n)
2773 unsigned long flags;
2775 local_irq_save(flags);
2776 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2777 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2778 local_irq_restore(flags);
2780 EXPORT_SYMBOL(__napi_schedule);
2782 void __napi_complete(struct napi_struct *n)
2784 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
2785 BUG_ON(n->gro_list);
2787 list_del(&n->poll_list);
2788 smp_mb__before_clear_bit();
2789 clear_bit(NAPI_STATE_SCHED, &n->state);
2791 EXPORT_SYMBOL(__napi_complete);
2793 void napi_complete(struct napi_struct *n)
2795 unsigned long flags;
2798 * don't let napi dequeue from the cpu poll list
2799 * just in case its running on a different cpu
2801 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
2805 local_irq_save(flags);
2807 local_irq_restore(flags);
2809 EXPORT_SYMBOL(napi_complete);
2811 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
2812 int (*poll)(struct napi_struct *, int), int weight)
2814 INIT_LIST_HEAD(&napi->poll_list);
2815 napi->gro_count = 0;
2816 napi->gro_list = NULL;
2819 napi->weight = weight;
2820 list_add(&napi->dev_list, &dev->napi_list);
2822 #ifdef CONFIG_NETPOLL
2823 spin_lock_init(&napi->poll_lock);
2824 napi->poll_owner = -1;
2826 set_bit(NAPI_STATE_SCHED, &napi->state);
2828 EXPORT_SYMBOL(netif_napi_add);
2830 void netif_napi_del(struct napi_struct *napi)
2832 struct sk_buff *skb, *next;
2834 list_del_init(&napi->dev_list);
2835 napi_free_frags(napi);
2837 for (skb = napi->gro_list; skb; skb = next) {
2843 napi->gro_list = NULL;
2844 napi->gro_count = 0;
2846 EXPORT_SYMBOL(netif_napi_del);
2849 static void net_rx_action(struct softirq_action *h)
2851 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2852 unsigned long time_limit = jiffies + 2;
2853 int budget = netdev_budget;
2856 local_irq_disable();
2858 while (!list_empty(list)) {
2859 struct napi_struct *n;
2862 /* If softirq window is exhuasted then punt.
2863 * Allow this to run for 2 jiffies since which will allow
2864 * an average latency of 1.5/HZ.
2866 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
2871 /* Even though interrupts have been re-enabled, this
2872 * access is safe because interrupts can only add new
2873 * entries to the tail of this list, and only ->poll()
2874 * calls can remove this head entry from the list.
2876 n = list_entry(list->next, struct napi_struct, poll_list);
2878 have = netpoll_poll_lock(n);
2882 /* This NAPI_STATE_SCHED test is for avoiding a race
2883 * with netpoll's poll_napi(). Only the entity which
2884 * obtains the lock and sees NAPI_STATE_SCHED set will
2885 * actually make the ->poll() call. Therefore we avoid
2886 * accidently calling ->poll() when NAPI is not scheduled.
2889 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
2890 work = n->poll(n, weight);
2894 WARN_ON_ONCE(work > weight);
2898 local_irq_disable();
2900 /* Drivers must not modify the NAPI state if they
2901 * consume the entire weight. In such cases this code
2902 * still "owns" the NAPI instance and therefore can
2903 * move the instance around on the list at-will.
2905 if (unlikely(work == weight)) {
2906 if (unlikely(napi_disable_pending(n))) {
2909 local_irq_disable();
2911 list_move_tail(&n->poll_list, list);
2914 netpoll_poll_unlock(have);
2919 #ifdef CONFIG_NET_DMA
2921 * There may not be any more sk_buffs coming right now, so push
2922 * any pending DMA copies to hardware
2924 dma_issue_pending_all();
2930 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2931 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2935 static gifconf_func_t *gifconf_list[NPROTO];
2938 * register_gifconf - register a SIOCGIF handler
2939 * @family: Address family
2940 * @gifconf: Function handler
2942 * Register protocol dependent address dumping routines. The handler
2943 * that is passed must not be freed or reused until it has been replaced
2944 * by another handler.
2946 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
2948 if (family >= NPROTO)
2950 gifconf_list[family] = gifconf;
2953 EXPORT_SYMBOL(register_gifconf);
2957 * Map an interface index to its name (SIOCGIFNAME)
2961 * We need this ioctl for efficient implementation of the
2962 * if_indextoname() function required by the IPv6 API. Without
2963 * it, we would have to search all the interfaces to find a
2967 static int dev_ifname(struct net *net, struct ifreq __user *arg)
2969 struct net_device *dev;
2973 * Fetch the caller's info block.
2976 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2980 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
2986 strcpy(ifr.ifr_name, dev->name);
2989 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2995 * Perform a SIOCGIFCONF call. This structure will change
2996 * size eventually, and there is nothing I can do about it.
2997 * Thus we will need a 'compatibility mode'.
3000 static int dev_ifconf(struct net *net, char __user *arg)
3003 struct net_device *dev;
3010 * Fetch the caller's info block.
3013 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
3020 * Loop over the interfaces, and write an info block for each.
3024 for_each_netdev(net, dev) {
3025 for (i = 0; i < NPROTO; i++) {
3026 if (gifconf_list[i]) {
3029 done = gifconf_list[i](dev, NULL, 0);
3031 done = gifconf_list[i](dev, pos + total,
3041 * All done. Write the updated control block back to the caller.
3043 ifc.ifc_len = total;
3046 * Both BSD and Solaris return 0 here, so we do too.
3048 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
3051 #ifdef CONFIG_PROC_FS
3053 * This is invoked by the /proc filesystem handler to display a device
3056 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3057 __acquires(dev_base_lock)
3059 struct net *net = seq_file_net(seq);
3061 struct net_device *dev;
3063 read_lock(&dev_base_lock);
3065 return SEQ_START_TOKEN;
3068 for_each_netdev(net, dev)
3075 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3077 struct net *net = seq_file_net(seq);
3079 return v == SEQ_START_TOKEN ?
3080 first_net_device(net) : next_net_device((struct net_device *)v);
3083 void dev_seq_stop(struct seq_file *seq, void *v)
3084 __releases(dev_base_lock)
3086 read_unlock(&dev_base_lock);
3089 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3091 const struct net_device_stats *stats = dev_get_stats(dev);
3093 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3094 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3095 dev->name, stats->rx_bytes, stats->rx_packets,
3097 stats->rx_dropped + stats->rx_missed_errors,
3098 stats->rx_fifo_errors,
3099 stats->rx_length_errors + stats->rx_over_errors +
3100 stats->rx_crc_errors + stats->rx_frame_errors,
3101 stats->rx_compressed, stats->multicast,
3102 stats->tx_bytes, stats->tx_packets,
3103 stats->tx_errors, stats->tx_dropped,
3104 stats->tx_fifo_errors, stats->collisions,
3105 stats->tx_carrier_errors +
3106 stats->tx_aborted_errors +
3107 stats->tx_window_errors +
3108 stats->tx_heartbeat_errors,
3109 stats->tx_compressed);
3113 * Called from the PROCfs module. This now uses the new arbitrary sized
3114 * /proc/net interface to create /proc/net/dev
3116 static int dev_seq_show(struct seq_file *seq, void *v)
3118 if (v == SEQ_START_TOKEN)
3119 seq_puts(seq, "Inter-| Receive "
3121 " face |bytes packets errs drop fifo frame "
3122 "compressed multicast|bytes packets errs "
3123 "drop fifo colls carrier compressed\n");
3125 dev_seq_printf_stats(seq, v);
3129 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
3131 struct netif_rx_stats *rc = NULL;
3133 while (*pos < nr_cpu_ids)
3134 if (cpu_online(*pos)) {
3135 rc = &per_cpu(netdev_rx_stat, *pos);
3142 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3144 return softnet_get_online(pos);
3147 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3150 return softnet_get_online(pos);
3153 static void softnet_seq_stop(struct seq_file *seq, void *v)
3157 static int softnet_seq_show(struct seq_file *seq, void *v)
3159 struct netif_rx_stats *s = v;
3161 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3162 s->total, s->dropped, s->time_squeeze, 0,
3163 0, 0, 0, 0, /* was fastroute */
3168 static const struct seq_operations dev_seq_ops = {
3169 .start = dev_seq_start,
3170 .next = dev_seq_next,
3171 .stop = dev_seq_stop,
3172 .show = dev_seq_show,
3175 static int dev_seq_open(struct inode *inode, struct file *file)
3177 return seq_open_net(inode, file, &dev_seq_ops,
3178 sizeof(struct seq_net_private));
3181 static const struct file_operations dev_seq_fops = {
3182 .owner = THIS_MODULE,
3183 .open = dev_seq_open,
3185 .llseek = seq_lseek,
3186 .release = seq_release_net,
3189 static const struct seq_operations softnet_seq_ops = {
3190 .start = softnet_seq_start,
3191 .next = softnet_seq_next,
3192 .stop = softnet_seq_stop,
3193 .show = softnet_seq_show,
3196 static int softnet_seq_open(struct inode *inode, struct file *file)
3198 return seq_open(file, &softnet_seq_ops);
3201 static const struct file_operations softnet_seq_fops = {
3202 .owner = THIS_MODULE,
3203 .open = softnet_seq_open,
3205 .llseek = seq_lseek,
3206 .release = seq_release,
3209 static void *ptype_get_idx(loff_t pos)
3211 struct packet_type *pt = NULL;
3215 list_for_each_entry_rcu(pt, &ptype_all, list) {
3221 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3222 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3231 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3235 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3238 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3240 struct packet_type *pt;
3241 struct list_head *nxt;
3245 if (v == SEQ_START_TOKEN)
3246 return ptype_get_idx(0);
3249 nxt = pt->list.next;
3250 if (pt->type == htons(ETH_P_ALL)) {
3251 if (nxt != &ptype_all)
3254 nxt = ptype_base[0].next;
3256 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3258 while (nxt == &ptype_base[hash]) {
3259 if (++hash >= PTYPE_HASH_SIZE)
3261 nxt = ptype_base[hash].next;
3264 return list_entry(nxt, struct packet_type, list);
3267 static void ptype_seq_stop(struct seq_file *seq, void *v)
3273 static int ptype_seq_show(struct seq_file *seq, void *v)
3275 struct packet_type *pt = v;
3277 if (v == SEQ_START_TOKEN)
3278 seq_puts(seq, "Type Device Function\n");
3279 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3280 if (pt->type == htons(ETH_P_ALL))
3281 seq_puts(seq, "ALL ");
3283 seq_printf(seq, "%04x", ntohs(pt->type));
3285 seq_printf(seq, " %-8s %pF\n",
3286 pt->dev ? pt->dev->name : "", pt->func);
3292 static const struct seq_operations ptype_seq_ops = {
3293 .start = ptype_seq_start,
3294 .next = ptype_seq_next,
3295 .stop = ptype_seq_stop,
3296 .show = ptype_seq_show,
3299 static int ptype_seq_open(struct inode *inode, struct file *file)
3301 return seq_open_net(inode, file, &ptype_seq_ops,
3302 sizeof(struct seq_net_private));
3305 static const struct file_operations ptype_seq_fops = {
3306 .owner = THIS_MODULE,
3307 .open = ptype_seq_open,
3309 .llseek = seq_lseek,
3310 .release = seq_release_net,
3314 static int __net_init dev_proc_net_init(struct net *net)
3318 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3320 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3322 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3325 if (wext_proc_init(net))
3331 proc_net_remove(net, "ptype");
3333 proc_net_remove(net, "softnet_stat");
3335 proc_net_remove(net, "dev");
3339 static void __net_exit dev_proc_net_exit(struct net *net)
3341 wext_proc_exit(net);
3343 proc_net_remove(net, "ptype");
3344 proc_net_remove(net, "softnet_stat");
3345 proc_net_remove(net, "dev");
3348 static struct pernet_operations __net_initdata dev_proc_ops = {
3349 .init = dev_proc_net_init,
3350 .exit = dev_proc_net_exit,
3353 static int __init dev_proc_init(void)
3355 return register_pernet_subsys(&dev_proc_ops);
3358 #define dev_proc_init() 0
3359 #endif /* CONFIG_PROC_FS */
3363 * netdev_set_master - set up master/slave pair
3364 * @slave: slave device
3365 * @master: new master device
3367 * Changes the master device of the slave. Pass %NULL to break the
3368 * bonding. The caller must hold the RTNL semaphore. On a failure
3369 * a negative errno code is returned. On success the reference counts
3370 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3371 * function returns zero.
3373 int netdev_set_master(struct net_device *slave, struct net_device *master)
3375 struct net_device *old = slave->master;
3385 slave->master = master;
3393 slave->flags |= IFF_SLAVE;
3395 slave->flags &= ~IFF_SLAVE;
3397 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3400 EXPORT_SYMBOL(netdev_set_master);
3402 static void dev_change_rx_flags(struct net_device *dev, int flags)
3404 const struct net_device_ops *ops = dev->netdev_ops;
3406 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3407 ops->ndo_change_rx_flags(dev, flags);
3410 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3412 unsigned short old_flags = dev->flags;
3418 dev->flags |= IFF_PROMISC;
3419 dev->promiscuity += inc;
3420 if (dev->promiscuity == 0) {
3423 * If inc causes overflow, untouch promisc and return error.
3426 dev->flags &= ~IFF_PROMISC;
3428 dev->promiscuity -= inc;
3429 printk(KERN_WARNING "%s: promiscuity touches roof, "
3430 "set promiscuity failed, promiscuity feature "
3431 "of device might be broken.\n", dev->name);
3435 if (dev->flags != old_flags) {
3436 printk(KERN_INFO "device %s %s promiscuous mode\n",
3437 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3439 if (audit_enabled) {
3440 current_uid_gid(&uid, &gid);
3441 audit_log(current->audit_context, GFP_ATOMIC,
3442 AUDIT_ANOM_PROMISCUOUS,
3443 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3444 dev->name, (dev->flags & IFF_PROMISC),
3445 (old_flags & IFF_PROMISC),
3446 audit_get_loginuid(current),
3448 audit_get_sessionid(current));
3451 dev_change_rx_flags(dev, IFF_PROMISC);
3457 * dev_set_promiscuity - update promiscuity count on a device
3461 * Add or remove promiscuity from a device. While the count in the device
3462 * remains above zero the interface remains promiscuous. Once it hits zero
3463 * the device reverts back to normal filtering operation. A negative inc
3464 * value is used to drop promiscuity on the device.
3465 * Return 0 if successful or a negative errno code on error.
3467 int dev_set_promiscuity(struct net_device *dev, int inc)
3469 unsigned short old_flags = dev->flags;
3472 err = __dev_set_promiscuity(dev, inc);
3475 if (dev->flags != old_flags)
3476 dev_set_rx_mode(dev);
3479 EXPORT_SYMBOL(dev_set_promiscuity);
3482 * dev_set_allmulti - update allmulti count on a device
3486 * Add or remove reception of all multicast frames to a device. While the
3487 * count in the device remains above zero the interface remains listening
3488 * to all interfaces. Once it hits zero the device reverts back to normal
3489 * filtering operation. A negative @inc value is used to drop the counter
3490 * when releasing a resource needing all multicasts.
3491 * Return 0 if successful or a negative errno code on error.
3494 int dev_set_allmulti(struct net_device *dev, int inc)
3496 unsigned short old_flags = dev->flags;
3500 dev->flags |= IFF_ALLMULTI;
3501 dev->allmulti += inc;
3502 if (dev->allmulti == 0) {
3505 * If inc causes overflow, untouch allmulti and return error.
3508 dev->flags &= ~IFF_ALLMULTI;
3510 dev->allmulti -= inc;
3511 printk(KERN_WARNING "%s: allmulti touches roof, "
3512 "set allmulti failed, allmulti feature of "
3513 "device might be broken.\n", dev->name);
3517 if (dev->flags ^ old_flags) {
3518 dev_change_rx_flags(dev, IFF_ALLMULTI);
3519 dev_set_rx_mode(dev);
3523 EXPORT_SYMBOL(dev_set_allmulti);
3526 * Upload unicast and multicast address lists to device and
3527 * configure RX filtering. When the device doesn't support unicast
3528 * filtering it is put in promiscuous mode while unicast addresses
3531 void __dev_set_rx_mode(struct net_device *dev)
3533 const struct net_device_ops *ops = dev->netdev_ops;
3535 /* dev_open will call this function so the list will stay sane. */
3536 if (!(dev->flags&IFF_UP))
3539 if (!netif_device_present(dev))
3542 if (ops->ndo_set_rx_mode)
3543 ops->ndo_set_rx_mode(dev);
3545 /* Unicast addresses changes may only happen under the rtnl,
3546 * therefore calling __dev_set_promiscuity here is safe.
3548 if (dev->uc.count > 0 && !dev->uc_promisc) {
3549 __dev_set_promiscuity(dev, 1);
3550 dev->uc_promisc = 1;
3551 } else if (dev->uc.count == 0 && dev->uc_promisc) {
3552 __dev_set_promiscuity(dev, -1);
3553 dev->uc_promisc = 0;
3556 if (ops->ndo_set_multicast_list)
3557 ops->ndo_set_multicast_list(dev);
3561 void dev_set_rx_mode(struct net_device *dev)
3563 netif_addr_lock_bh(dev);
3564 __dev_set_rx_mode(dev);
3565 netif_addr_unlock_bh(dev);
3568 /* hw addresses list handling functions */
3570 static int __hw_addr_add(struct netdev_hw_addr_list *list, unsigned char *addr,
3571 int addr_len, unsigned char addr_type)
3573 struct netdev_hw_addr *ha;
3576 if (addr_len > MAX_ADDR_LEN)
3579 list_for_each_entry(ha, &list->list, list) {
3580 if (!memcmp(ha->addr, addr, addr_len) &&
3581 ha->type == addr_type) {
3588 alloc_size = sizeof(*ha);
3589 if (alloc_size < L1_CACHE_BYTES)
3590 alloc_size = L1_CACHE_BYTES;
3591 ha = kmalloc(alloc_size, GFP_ATOMIC);
3594 memcpy(ha->addr, addr, addr_len);
3595 ha->type = addr_type;
3598 list_add_tail_rcu(&ha->list, &list->list);
3603 static void ha_rcu_free(struct rcu_head *head)
3605 struct netdev_hw_addr *ha;
3607 ha = container_of(head, struct netdev_hw_addr, rcu_head);
3611 static int __hw_addr_del(struct netdev_hw_addr_list *list, unsigned char *addr,
3612 int addr_len, unsigned char addr_type)
3614 struct netdev_hw_addr *ha;
3616 list_for_each_entry(ha, &list->list, list) {
3617 if (!memcmp(ha->addr, addr, addr_len) &&
3618 (ha->type == addr_type || !addr_type)) {
3621 list_del_rcu(&ha->list);
3622 call_rcu(&ha->rcu_head, ha_rcu_free);
3630 static int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
3631 struct netdev_hw_addr_list *from_list,
3633 unsigned char addr_type)
3636 struct netdev_hw_addr *ha, *ha2;
3639 list_for_each_entry(ha, &from_list->list, list) {
3640 type = addr_type ? addr_type : ha->type;
3641 err = __hw_addr_add(to_list, ha->addr, addr_len, type);
3648 list_for_each_entry(ha2, &from_list->list, list) {
3651 type = addr_type ? addr_type : ha2->type;
3652 __hw_addr_del(to_list, ha2->addr, addr_len, type);
3657 static void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
3658 struct netdev_hw_addr_list *from_list,
3660 unsigned char addr_type)
3662 struct netdev_hw_addr *ha;
3665 list_for_each_entry(ha, &from_list->list, list) {
3666 type = addr_type ? addr_type : ha->type;
3667 __hw_addr_del(to_list, ha->addr, addr_len, addr_type);
3671 static int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
3672 struct netdev_hw_addr_list *from_list,
3676 struct netdev_hw_addr *ha, *tmp;
3678 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
3680 err = __hw_addr_add(to_list, ha->addr,
3681 addr_len, ha->type);
3686 } else if (ha->refcount == 1) {
3687 __hw_addr_del(to_list, ha->addr, addr_len, ha->type);
3688 __hw_addr_del(from_list, ha->addr, addr_len, ha->type);
3694 static void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
3695 struct netdev_hw_addr_list *from_list,
3698 struct netdev_hw_addr *ha, *tmp;
3700 list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
3702 __hw_addr_del(to_list, ha->addr,
3703 addr_len, ha->type);
3705 __hw_addr_del(from_list, ha->addr,
3706 addr_len, ha->type);
3711 static void __hw_addr_flush(struct netdev_hw_addr_list *list)
3713 struct netdev_hw_addr *ha, *tmp;
3715 list_for_each_entry_safe(ha, tmp, &list->list, list) {
3716 list_del_rcu(&ha->list);
3717 call_rcu(&ha->rcu_head, ha_rcu_free);
3722 static void __hw_addr_init(struct netdev_hw_addr_list *list)
3724 INIT_LIST_HEAD(&list->list);
3728 /* Device addresses handling functions */
3730 static void dev_addr_flush(struct net_device *dev)
3732 /* rtnl_mutex must be held here */
3734 __hw_addr_flush(&dev->dev_addrs);
3735 dev->dev_addr = NULL;
3738 static int dev_addr_init(struct net_device *dev)
3740 unsigned char addr[MAX_ADDR_LEN];
3741 struct netdev_hw_addr *ha;
3744 /* rtnl_mutex must be held here */
3746 __hw_addr_init(&dev->dev_addrs);
3747 memset(addr, 0, sizeof(addr));
3748 err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr),
3749 NETDEV_HW_ADDR_T_LAN);
3752 * Get the first (previously created) address from the list
3753 * and set dev_addr pointer to this location.
3755 ha = list_first_entry(&dev->dev_addrs.list,
3756 struct netdev_hw_addr, list);
3757 dev->dev_addr = ha->addr;
3763 * dev_addr_add - Add a device address
3765 * @addr: address to add
3766 * @addr_type: address type
3768 * Add a device address to the device or increase the reference count if
3769 * it already exists.
3771 * The caller must hold the rtnl_mutex.
3773 int dev_addr_add(struct net_device *dev, unsigned char *addr,
3774 unsigned char addr_type)
3780 err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type);
3782 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3785 EXPORT_SYMBOL(dev_addr_add);
3788 * dev_addr_del - Release a device address.
3790 * @addr: address to delete
3791 * @addr_type: address type
3793 * Release reference to a device address and remove it from the device
3794 * if the reference count drops to zero.
3796 * The caller must hold the rtnl_mutex.
3798 int dev_addr_del(struct net_device *dev, unsigned char *addr,
3799 unsigned char addr_type)
3802 struct netdev_hw_addr *ha;
3807 * We can not remove the first address from the list because
3808 * dev->dev_addr points to that.
3810 ha = list_first_entry(&dev->dev_addrs.list,
3811 struct netdev_hw_addr, list);
3812 if (ha->addr == dev->dev_addr && ha->refcount == 1)
3815 err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len,
3818 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3821 EXPORT_SYMBOL(dev_addr_del);
3824 * dev_addr_add_multiple - Add device addresses from another device
3825 * @to_dev: device to which addresses will be added
3826 * @from_dev: device from which addresses will be added
3827 * @addr_type: address type - 0 means type will be used from from_dev
3829 * Add device addresses of the one device to another.
3831 * The caller must hold the rtnl_mutex.
3833 int dev_addr_add_multiple(struct net_device *to_dev,
3834 struct net_device *from_dev,
3835 unsigned char addr_type)
3841 if (from_dev->addr_len != to_dev->addr_len)
3843 err = __hw_addr_add_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs,
3844 to_dev->addr_len, addr_type);
3846 call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
3849 EXPORT_SYMBOL(dev_addr_add_multiple);
3852 * dev_addr_del_multiple - Delete device addresses by another device
3853 * @to_dev: device where the addresses will be deleted
3854 * @from_dev: device by which addresses the addresses will be deleted
3855 * @addr_type: address type - 0 means type will used from from_dev
3857 * Deletes addresses in to device by the list of addresses in from device.
3859 * The caller must hold the rtnl_mutex.
3861 int dev_addr_del_multiple(struct net_device *to_dev,
3862 struct net_device *from_dev,
3863 unsigned char addr_type)
3867 if (from_dev->addr_len != to_dev->addr_len)
3869 __hw_addr_del_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs,
3870 to_dev->addr_len, addr_type);
3871 call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
3874 EXPORT_SYMBOL(dev_addr_del_multiple);
3876 /* multicast addresses handling functions */
3878 int __dev_addr_delete(struct dev_addr_list **list, int *count,
3879 void *addr, int alen, int glbl)
3881 struct dev_addr_list *da;
3883 for (; (da = *list) != NULL; list = &da->next) {
3884 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3885 alen == da->da_addrlen) {
3887 int old_glbl = da->da_gusers;
3904 int __dev_addr_add(struct dev_addr_list **list, int *count,
3905 void *addr, int alen, int glbl)
3907 struct dev_addr_list *da;
3909 for (da = *list; da != NULL; da = da->next) {
3910 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3911 da->da_addrlen == alen) {
3913 int old_glbl = da->da_gusers;
3923 da = kzalloc(sizeof(*da), GFP_ATOMIC);
3926 memcpy(da->da_addr, addr, alen);
3927 da->da_addrlen = alen;
3929 da->da_gusers = glbl ? 1 : 0;
3937 * dev_unicast_delete - Release secondary unicast address.
3939 * @addr: address to delete
3941 * Release reference to a secondary unicast address and remove it
3942 * from the device if the reference count drops to zero.
3944 * The caller must hold the rtnl_mutex.
3946 int dev_unicast_delete(struct net_device *dev, void *addr)
3952 netif_addr_lock_bh(dev);
3953 err = __hw_addr_del(&dev->uc, addr, dev->addr_len,
3954 NETDEV_HW_ADDR_T_UNICAST);
3956 __dev_set_rx_mode(dev);
3957 netif_addr_unlock_bh(dev);
3960 EXPORT_SYMBOL(dev_unicast_delete);
3963 * dev_unicast_add - add a secondary unicast address
3965 * @addr: address to add
3967 * Add a secondary unicast address to the device or increase
3968 * the reference count if it already exists.
3970 * The caller must hold the rtnl_mutex.
3972 int dev_unicast_add(struct net_device *dev, void *addr)
3978 netif_addr_lock_bh(dev);
3979 err = __hw_addr_add(&dev->uc, addr, dev->addr_len,
3980 NETDEV_HW_ADDR_T_UNICAST);
3982 __dev_set_rx_mode(dev);
3983 netif_addr_unlock_bh(dev);
3986 EXPORT_SYMBOL(dev_unicast_add);
3988 int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
3989 struct dev_addr_list **from, int *from_count)
3991 struct dev_addr_list *da, *next;
3995 while (da != NULL) {
3997 if (!da->da_synced) {
3998 err = __dev_addr_add(to, to_count,
3999 da->da_addr, da->da_addrlen, 0);
4004 } else if (da->da_users == 1) {
4005 __dev_addr_delete(to, to_count,
4006 da->da_addr, da->da_addrlen, 0);
4007 __dev_addr_delete(from, from_count,
4008 da->da_addr, da->da_addrlen, 0);
4014 EXPORT_SYMBOL_GPL(__dev_addr_sync);
4016 void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
4017 struct dev_addr_list **from, int *from_count)
4019 struct dev_addr_list *da, *next;
4022 while (da != NULL) {
4024 if (da->da_synced) {
4025 __dev_addr_delete(to, to_count,
4026 da->da_addr, da->da_addrlen, 0);
4028 __dev_addr_delete(from, from_count,
4029 da->da_addr, da->da_addrlen, 0);
4034 EXPORT_SYMBOL_GPL(__dev_addr_unsync);
4037 * dev_unicast_sync - Synchronize device's unicast list to another device
4038 * @to: destination device
4039 * @from: source device
4041 * Add newly added addresses to the destination device and release
4042 * addresses that have no users left. The source device must be
4043 * locked by netif_tx_lock_bh.
4045 * This function is intended to be called from the dev->set_rx_mode
4046 * function of layered software devices.
4048 int dev_unicast_sync(struct net_device *to, struct net_device *from)
4052 if (to->addr_len != from->addr_len)
4055 netif_addr_lock_bh(to);
4056 err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len);
4058 __dev_set_rx_mode(to);
4059 netif_addr_unlock_bh(to);
4062 EXPORT_SYMBOL(dev_unicast_sync);
4065 * dev_unicast_unsync - Remove synchronized addresses from the destination device
4066 * @to: destination device
4067 * @from: source device
4069 * Remove all addresses that were added to the destination device by
4070 * dev_unicast_sync(). This function is intended to be called from the
4071 * dev->stop function of layered software devices.
4073 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
4075 if (to->addr_len != from->addr_len)
4078 netif_addr_lock_bh(from);
4079 netif_addr_lock(to);
4080 __hw_addr_unsync(&to->uc, &from->uc, to->addr_len);
4081 __dev_set_rx_mode(to);
4082 netif_addr_unlock(to);
4083 netif_addr_unlock_bh(from);
4085 EXPORT_SYMBOL(dev_unicast_unsync);
4087 static void dev_unicast_flush(struct net_device *dev)
4089 netif_addr_lock_bh(dev);
4090 __hw_addr_flush(&dev->uc);
4091 netif_addr_unlock_bh(dev);
4094 static void dev_unicast_init(struct net_device *dev)
4096 __hw_addr_init(&dev->uc);
4100 static void __dev_addr_discard(struct dev_addr_list **list)
4102 struct dev_addr_list *tmp;
4104 while (*list != NULL) {
4107 if (tmp->da_users > tmp->da_gusers)
4108 printk("__dev_addr_discard: address leakage! "
4109 "da_users=%d\n", tmp->da_users);
4114 static void dev_addr_discard(struct net_device *dev)
4116 netif_addr_lock_bh(dev);
4118 __dev_addr_discard(&dev->mc_list);
4121 netif_addr_unlock_bh(dev);
4125 * dev_get_flags - get flags reported to userspace
4128 * Get the combination of flag bits exported through APIs to userspace.
4130 unsigned dev_get_flags(const struct net_device *dev)
4134 flags = (dev->flags & ~(IFF_PROMISC |
4139 (dev->gflags & (IFF_PROMISC |
4142 if (netif_running(dev)) {
4143 if (netif_oper_up(dev))
4144 flags |= IFF_RUNNING;
4145 if (netif_carrier_ok(dev))
4146 flags |= IFF_LOWER_UP;
4147 if (netif_dormant(dev))
4148 flags |= IFF_DORMANT;
4153 EXPORT_SYMBOL(dev_get_flags);
4156 * dev_change_flags - change device settings
4158 * @flags: device state flags
4160 * Change settings on device based state flags. The flags are
4161 * in the userspace exported format.
4163 int dev_change_flags(struct net_device *dev, unsigned flags)
4166 int old_flags = dev->flags;
4171 * Set the flags on our device.
4174 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4175 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4177 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4181 * Load in the correct multicast list now the flags have changed.
4184 if ((old_flags ^ flags) & IFF_MULTICAST)
4185 dev_change_rx_flags(dev, IFF_MULTICAST);
4187 dev_set_rx_mode(dev);
4190 * Have we downed the interface. We handle IFF_UP ourselves
4191 * according to user attempts to set it, rather than blindly
4196 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4197 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
4200 dev_set_rx_mode(dev);
4203 if (dev->flags & IFF_UP &&
4204 ((old_flags ^ dev->flags) & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
4206 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4208 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4209 int inc = (flags & IFF_PROMISC) ? 1 : -1;
4211 dev->gflags ^= IFF_PROMISC;
4212 dev_set_promiscuity(dev, inc);
4215 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4216 is important. Some (broken) drivers set IFF_PROMISC, when
4217 IFF_ALLMULTI is requested not asking us and not reporting.
4219 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4220 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
4222 dev->gflags ^= IFF_ALLMULTI;
4223 dev_set_allmulti(dev, inc);
4226 /* Exclude state transition flags, already notified */
4227 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
4229 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4233 EXPORT_SYMBOL(dev_change_flags);
4236 * dev_set_mtu - Change maximum transfer unit
4238 * @new_mtu: new transfer unit
4240 * Change the maximum transfer size of the network device.
4242 int dev_set_mtu(struct net_device *dev, int new_mtu)
4244 const struct net_device_ops *ops = dev->netdev_ops;
4247 if (new_mtu == dev->mtu)
4250 /* MTU must be positive. */
4254 if (!netif_device_present(dev))
4258 if (ops->ndo_change_mtu)
4259 err = ops->ndo_change_mtu(dev, new_mtu);
4263 if (!err && dev->flags & IFF_UP)
4264 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4267 EXPORT_SYMBOL(dev_set_mtu);
4270 * dev_set_mac_address - Change Media Access Control Address
4274 * Change the hardware (MAC) address of the device
4276 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4278 const struct net_device_ops *ops = dev->netdev_ops;
4281 if (!ops->ndo_set_mac_address)
4283 if (sa->sa_family != dev->type)
4285 if (!netif_device_present(dev))
4287 err = ops->ndo_set_mac_address(dev, sa);
4289 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4292 EXPORT_SYMBOL(dev_set_mac_address);
4295 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
4297 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4300 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4306 case SIOCGIFFLAGS: /* Get interface flags */
4307 ifr->ifr_flags = (short) dev_get_flags(dev);
4310 case SIOCGIFMETRIC: /* Get the metric on the interface
4311 (currently unused) */
4312 ifr->ifr_metric = 0;
4315 case SIOCGIFMTU: /* Get the MTU of a device */
4316 ifr->ifr_mtu = dev->mtu;
4321 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4323 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4324 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4325 ifr->ifr_hwaddr.sa_family = dev->type;
4333 ifr->ifr_map.mem_start = dev->mem_start;
4334 ifr->ifr_map.mem_end = dev->mem_end;
4335 ifr->ifr_map.base_addr = dev->base_addr;
4336 ifr->ifr_map.irq = dev->irq;
4337 ifr->ifr_map.dma = dev->dma;
4338 ifr->ifr_map.port = dev->if_port;
4342 ifr->ifr_ifindex = dev->ifindex;
4346 ifr->ifr_qlen = dev->tx_queue_len;
4350 /* dev_ioctl() should ensure this case
4362 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4364 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4367 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4368 const struct net_device_ops *ops;
4373 ops = dev->netdev_ops;
4376 case SIOCSIFFLAGS: /* Set interface flags */
4377 return dev_change_flags(dev, ifr->ifr_flags);
4379 case SIOCSIFMETRIC: /* Set the metric on the interface
4380 (currently unused) */
4383 case SIOCSIFMTU: /* Set the MTU of a device */
4384 return dev_set_mtu(dev, ifr->ifr_mtu);
4387 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4389 case SIOCSIFHWBROADCAST:
4390 if (ifr->ifr_hwaddr.sa_family != dev->type)
4392 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4393 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4394 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4398 if (ops->ndo_set_config) {
4399 if (!netif_device_present(dev))
4401 return ops->ndo_set_config(dev, &ifr->ifr_map);
4406 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4407 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4409 if (!netif_device_present(dev))
4411 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
4415 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4416 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4418 if (!netif_device_present(dev))
4420 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
4424 if (ifr->ifr_qlen < 0)
4426 dev->tx_queue_len = ifr->ifr_qlen;
4430 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4431 return dev_change_name(dev, ifr->ifr_newname);
4434 * Unknown or private ioctl
4437 if ((cmd >= SIOCDEVPRIVATE &&
4438 cmd <= SIOCDEVPRIVATE + 15) ||
4439 cmd == SIOCBONDENSLAVE ||
4440 cmd == SIOCBONDRELEASE ||
4441 cmd == SIOCBONDSETHWADDR ||
4442 cmd == SIOCBONDSLAVEINFOQUERY ||
4443 cmd == SIOCBONDINFOQUERY ||
4444 cmd == SIOCBONDCHANGEACTIVE ||
4445 cmd == SIOCGMIIPHY ||
4446 cmd == SIOCGMIIREG ||
4447 cmd == SIOCSMIIREG ||
4448 cmd == SIOCBRADDIF ||
4449 cmd == SIOCBRDELIF ||
4450 cmd == SIOCSHWTSTAMP ||
4451 cmd == SIOCWANDEV) {
4453 if (ops->ndo_do_ioctl) {
4454 if (netif_device_present(dev))
4455 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4467 * This function handles all "interface"-type I/O control requests. The actual
4468 * 'doing' part of this is dev_ifsioc above.
4472 * dev_ioctl - network device ioctl
4473 * @net: the applicable net namespace
4474 * @cmd: command to issue
4475 * @arg: pointer to a struct ifreq in user space
4477 * Issue ioctl functions to devices. This is normally called by the
4478 * user space syscall interfaces but can sometimes be useful for
4479 * other purposes. The return value is the return from the syscall if
4480 * positive or a negative errno code on error.
4483 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4489 /* One special case: SIOCGIFCONF takes ifconf argument
4490 and requires shared lock, because it sleeps writing
4494 if (cmd == SIOCGIFCONF) {
4496 ret = dev_ifconf(net, (char __user *) arg);
4500 if (cmd == SIOCGIFNAME)
4501 return dev_ifname(net, (struct ifreq __user *)arg);
4503 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4506 ifr.ifr_name[IFNAMSIZ-1] = 0;
4508 colon = strchr(ifr.ifr_name, ':');
4513 * See which interface the caller is talking about.
4518 * These ioctl calls:
4519 * - can be done by all.
4520 * - atomic and do not require locking.
4531 dev_load(net, ifr.ifr_name);
4532 read_lock(&dev_base_lock);
4533 ret = dev_ifsioc_locked(net, &ifr, cmd);
4534 read_unlock(&dev_base_lock);
4538 if (copy_to_user(arg, &ifr,
4539 sizeof(struct ifreq)))
4545 dev_load(net, ifr.ifr_name);
4547 ret = dev_ethtool(net, &ifr);
4552 if (copy_to_user(arg, &ifr,
4553 sizeof(struct ifreq)))
4559 * These ioctl calls:
4560 * - require superuser power.
4561 * - require strict serialization.
4567 if (!capable(CAP_NET_ADMIN))
4569 dev_load(net, ifr.ifr_name);
4571 ret = dev_ifsioc(net, &ifr, cmd);
4576 if (copy_to_user(arg, &ifr,
4577 sizeof(struct ifreq)))
4583 * These ioctl calls:
4584 * - require superuser power.
4585 * - require strict serialization.
4586 * - do not return a value
4596 case SIOCSIFHWBROADCAST:
4599 case SIOCBONDENSLAVE:
4600 case SIOCBONDRELEASE:
4601 case SIOCBONDSETHWADDR:
4602 case SIOCBONDCHANGEACTIVE:
4606 if (!capable(CAP_NET_ADMIN))
4609 case SIOCBONDSLAVEINFOQUERY:
4610 case SIOCBONDINFOQUERY:
4611 dev_load(net, ifr.ifr_name);
4613 ret = dev_ifsioc(net, &ifr, cmd);
4618 /* Get the per device memory space. We can add this but
4619 * currently do not support it */
4621 /* Set the per device memory buffer space.
4622 * Not applicable in our case */
4627 * Unknown or private ioctl.
4630 if (cmd == SIOCWANDEV ||
4631 (cmd >= SIOCDEVPRIVATE &&
4632 cmd <= SIOCDEVPRIVATE + 15)) {
4633 dev_load(net, ifr.ifr_name);
4635 ret = dev_ifsioc(net, &ifr, cmd);
4637 if (!ret && copy_to_user(arg, &ifr,
4638 sizeof(struct ifreq)))
4642 /* Take care of Wireless Extensions */
4643 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4644 return wext_handle_ioctl(net, &ifr, cmd, arg);
4651 * dev_new_index - allocate an ifindex
4652 * @net: the applicable net namespace
4654 * Returns a suitable unique value for a new device interface
4655 * number. The caller must hold the rtnl semaphore or the
4656 * dev_base_lock to be sure it remains unique.
4658 static int dev_new_index(struct net *net)
4664 if (!__dev_get_by_index(net, ifindex))
4669 /* Delayed registration/unregisteration */
4670 static LIST_HEAD(net_todo_list);
4672 static void net_set_todo(struct net_device *dev)
4674 list_add_tail(&dev->todo_list, &net_todo_list);
4677 static void rollback_registered_many(struct list_head *head)
4679 struct net_device *dev;
4681 BUG_ON(dev_boot_phase);
4684 list_for_each_entry(dev, head, unreg_list) {
4685 /* Some devices call without registering
4686 * for initialization unwind.
4688 if (dev->reg_state == NETREG_UNINITIALIZED) {
4689 pr_debug("unregister_netdevice: device %s/%p never "
4690 "was registered\n", dev->name, dev);
4696 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4698 /* If device is running, close it first. */
4701 /* And unlink it from device chain. */
4702 unlist_netdevice(dev);
4704 dev->reg_state = NETREG_UNREGISTERING;
4709 list_for_each_entry(dev, head, unreg_list) {
4710 /* Shutdown queueing discipline. */
4714 /* Notify protocols, that we are about to destroy
4715 this device. They should clean all the things.
4717 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4720 * Flush the unicast and multicast chains
4722 dev_unicast_flush(dev);
4723 dev_addr_discard(dev);
4725 if (dev->netdev_ops->ndo_uninit)
4726 dev->netdev_ops->ndo_uninit(dev);
4728 /* Notifier chain MUST detach us from master device. */
4729 WARN_ON(dev->master);
4731 /* Remove entries from kobject tree */
4732 netdev_unregister_kobject(dev);
4737 list_for_each_entry(dev, head, unreg_list)
4741 static void rollback_registered(struct net_device *dev)
4745 list_add(&dev->unreg_list, &single);
4746 rollback_registered_many(&single);
4749 static void __netdev_init_queue_locks_one(struct net_device *dev,
4750 struct netdev_queue *dev_queue,
4753 spin_lock_init(&dev_queue->_xmit_lock);
4754 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4755 dev_queue->xmit_lock_owner = -1;
4758 static void netdev_init_queue_locks(struct net_device *dev)
4760 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4761 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4764 unsigned long netdev_fix_features(unsigned long features, const char *name)
4766 /* Fix illegal SG+CSUM combinations. */
4767 if ((features & NETIF_F_SG) &&
4768 !(features & NETIF_F_ALL_CSUM)) {
4770 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4771 "checksum feature.\n", name);
4772 features &= ~NETIF_F_SG;
4775 /* TSO requires that SG is present as well. */
4776 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4778 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4779 "SG feature.\n", name);
4780 features &= ~NETIF_F_TSO;
4783 if (features & NETIF_F_UFO) {
4784 if (!(features & NETIF_F_GEN_CSUM)) {
4786 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4787 "since no NETIF_F_HW_CSUM feature.\n",
4789 features &= ~NETIF_F_UFO;
4792 if (!(features & NETIF_F_SG)) {
4794 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4795 "since no NETIF_F_SG feature.\n", name);
4796 features &= ~NETIF_F_UFO;
4802 EXPORT_SYMBOL(netdev_fix_features);
4805 * register_netdevice - register a network device
4806 * @dev: device to register
4808 * Take a completed network device structure and add it to the kernel
4809 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4810 * chain. 0 is returned on success. A negative errno code is returned
4811 * on a failure to set up the device, or if the name is a duplicate.
4813 * Callers must hold the rtnl semaphore. You may want
4814 * register_netdev() instead of this.
4817 * The locking appears insufficient to guarantee two parallel registers
4818 * will not get the same name.
4821 int register_netdevice(struct net_device *dev)
4823 struct hlist_head *head;
4824 struct hlist_node *p;
4826 struct net *net = dev_net(dev);
4828 BUG_ON(dev_boot_phase);
4833 /* When net_device's are persistent, this will be fatal. */
4834 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4837 spin_lock_init(&dev->addr_list_lock);
4838 netdev_set_addr_lockdep_class(dev);
4839 netdev_init_queue_locks(dev);
4843 /* Init, if this function is available */
4844 if (dev->netdev_ops->ndo_init) {
4845 ret = dev->netdev_ops->ndo_init(dev);
4853 if (!dev_valid_name(dev->name)) {
4858 dev->ifindex = dev_new_index(net);
4859 if (dev->iflink == -1)
4860 dev->iflink = dev->ifindex;
4862 /* Check for existence of name */
4863 head = dev_name_hash(net, dev->name);
4864 hlist_for_each(p, head) {
4865 struct net_device *d
4866 = hlist_entry(p, struct net_device, name_hlist);
4867 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
4873 /* Fix illegal checksum combinations */
4874 if ((dev->features & NETIF_F_HW_CSUM) &&
4875 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4876 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4878 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4881 if ((dev->features & NETIF_F_NO_CSUM) &&
4882 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4883 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4885 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4888 dev->features = netdev_fix_features(dev->features, dev->name);
4890 /* Enable software GSO if SG is supported. */
4891 if (dev->features & NETIF_F_SG)
4892 dev->features |= NETIF_F_GSO;
4894 netdev_initialize_kobject(dev);
4896 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
4897 ret = notifier_to_errno(ret);
4901 ret = netdev_register_kobject(dev);
4904 dev->reg_state = NETREG_REGISTERED;
4907 * Default initial state at registry is that the
4908 * device is present.
4911 set_bit(__LINK_STATE_PRESENT, &dev->state);
4913 dev_init_scheduler(dev);
4915 list_netdevice(dev);
4917 /* Notify protocols, that a new device appeared. */
4918 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4919 ret = notifier_to_errno(ret);
4921 rollback_registered(dev);
4922 dev->reg_state = NETREG_UNREGISTERED;
4929 if (dev->netdev_ops->ndo_uninit)
4930 dev->netdev_ops->ndo_uninit(dev);
4933 EXPORT_SYMBOL(register_netdevice);
4936 * init_dummy_netdev - init a dummy network device for NAPI
4937 * @dev: device to init
4939 * This takes a network device structure and initialize the minimum
4940 * amount of fields so it can be used to schedule NAPI polls without
4941 * registering a full blown interface. This is to be used by drivers
4942 * that need to tie several hardware interfaces to a single NAPI
4943 * poll scheduler due to HW limitations.
4945 int init_dummy_netdev(struct net_device *dev)
4947 /* Clear everything. Note we don't initialize spinlocks
4948 * are they aren't supposed to be taken by any of the
4949 * NAPI code and this dummy netdev is supposed to be
4950 * only ever used for NAPI polls
4952 memset(dev, 0, sizeof(struct net_device));
4954 /* make sure we BUG if trying to hit standard
4955 * register/unregister code path
4957 dev->reg_state = NETREG_DUMMY;
4959 /* initialize the ref count */
4960 atomic_set(&dev->refcnt, 1);
4962 /* NAPI wants this */
4963 INIT_LIST_HEAD(&dev->napi_list);
4965 /* a dummy interface is started by default */
4966 set_bit(__LINK_STATE_PRESENT, &dev->state);
4967 set_bit(__LINK_STATE_START, &dev->state);
4971 EXPORT_SYMBOL_GPL(init_dummy_netdev);
4975 * register_netdev - register a network device
4976 * @dev: device to register
4978 * Take a completed network device structure and add it to the kernel
4979 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4980 * chain. 0 is returned on success. A negative errno code is returned
4981 * on a failure to set up the device, or if the name is a duplicate.
4983 * This is a wrapper around register_netdevice that takes the rtnl semaphore
4984 * and expands the device name if you passed a format string to
4987 int register_netdev(struct net_device *dev)
4994 * If the name is a format string the caller wants us to do a
4997 if (strchr(dev->name, '%')) {
4998 err = dev_alloc_name(dev, dev->name);
5003 err = register_netdevice(dev);
5008 EXPORT_SYMBOL(register_netdev);
5011 * netdev_wait_allrefs - wait until all references are gone.
5013 * This is called when unregistering network devices.
5015 * Any protocol or device that holds a reference should register
5016 * for netdevice notification, and cleanup and put back the
5017 * reference if they receive an UNREGISTER event.
5018 * We can get stuck here if buggy protocols don't correctly
5021 static void netdev_wait_allrefs(struct net_device *dev)
5023 unsigned long rebroadcast_time, warning_time;
5025 rebroadcast_time = warning_time = jiffies;
5026 while (atomic_read(&dev->refcnt) != 0) {
5027 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5030 /* Rebroadcast unregister notification */
5031 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5033 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
5035 /* We must not have linkwatch events
5036 * pending on unregister. If this
5037 * happens, we simply run the queue
5038 * unscheduled, resulting in a noop
5041 linkwatch_run_queue();
5046 rebroadcast_time = jiffies;
5051 if (time_after(jiffies, warning_time + 10 * HZ)) {
5052 printk(KERN_EMERG "unregister_netdevice: "
5053 "waiting for %s to become free. Usage "
5055 dev->name, atomic_read(&dev->refcnt));
5056 warning_time = jiffies;
5065 * register_netdevice(x1);
5066 * register_netdevice(x2);
5068 * unregister_netdevice(y1);
5069 * unregister_netdevice(y2);
5075 * We are invoked by rtnl_unlock().
5076 * This allows us to deal with problems:
5077 * 1) We can delete sysfs objects which invoke hotplug
5078 * without deadlocking with linkwatch via keventd.
5079 * 2) Since we run with the RTNL semaphore not held, we can sleep
5080 * safely in order to wait for the netdev refcnt to drop to zero.
5082 * We must not return until all unregister events added during
5083 * the interval the lock was held have been completed.
5085 void netdev_run_todo(void)
5087 struct list_head list;
5089 /* Snapshot list, allow later requests */
5090 list_replace_init(&net_todo_list, &list);
5094 while (!list_empty(&list)) {
5095 struct net_device *dev
5096 = list_entry(list.next, struct net_device, todo_list);
5097 list_del(&dev->todo_list);
5099 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5100 printk(KERN_ERR "network todo '%s' but state %d\n",
5101 dev->name, dev->reg_state);
5106 dev->reg_state = NETREG_UNREGISTERED;
5108 on_each_cpu(flush_backlog, dev, 1);
5110 netdev_wait_allrefs(dev);
5113 BUG_ON(atomic_read(&dev->refcnt));
5114 WARN_ON(dev->ip_ptr);
5115 WARN_ON(dev->ip6_ptr);
5116 WARN_ON(dev->dn_ptr);
5118 if (dev->destructor)
5119 dev->destructor(dev);
5121 /* Free network device */
5122 kobject_put(&dev->dev.kobj);
5127 * dev_get_stats - get network device statistics
5128 * @dev: device to get statistics from
5130 * Get network statistics from device. The device driver may provide
5131 * its own method by setting dev->netdev_ops->get_stats; otherwise
5132 * the internal statistics structure is used.
5134 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5136 const struct net_device_ops *ops = dev->netdev_ops;
5138 if (ops->ndo_get_stats)
5139 return ops->ndo_get_stats(dev);
5141 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5142 struct net_device_stats *stats = &dev->stats;
5144 struct netdev_queue *txq;
5146 for (i = 0; i < dev->num_tx_queues; i++) {
5147 txq = netdev_get_tx_queue(dev, i);
5148 tx_bytes += txq->tx_bytes;
5149 tx_packets += txq->tx_packets;
5150 tx_dropped += txq->tx_dropped;
5152 if (tx_bytes || tx_packets || tx_dropped) {
5153 stats->tx_bytes = tx_bytes;
5154 stats->tx_packets = tx_packets;
5155 stats->tx_dropped = tx_dropped;
5160 EXPORT_SYMBOL(dev_get_stats);
5162 static void netdev_init_one_queue(struct net_device *dev,
5163 struct netdev_queue *queue,
5169 static void netdev_init_queues(struct net_device *dev)
5171 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5172 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5173 spin_lock_init(&dev->tx_global_lock);
5177 * alloc_netdev_mq - allocate network device
5178 * @sizeof_priv: size of private data to allocate space for
5179 * @name: device name format string
5180 * @setup: callback to initialize device
5181 * @queue_count: the number of subqueues to allocate
5183 * Allocates a struct net_device with private data area for driver use
5184 * and performs basic initialization. Also allocates subquue structs
5185 * for each queue on the device at the end of the netdevice.
5187 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5188 void (*setup)(struct net_device *), unsigned int queue_count)
5190 struct netdev_queue *tx;
5191 struct net_device *dev;
5193 struct net_device *p;
5195 BUG_ON(strlen(name) >= sizeof(dev->name));
5197 alloc_size = sizeof(struct net_device);
5199 /* ensure 32-byte alignment of private area */
5200 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5201 alloc_size += sizeof_priv;
5203 /* ensure 32-byte alignment of whole construct */
5204 alloc_size += NETDEV_ALIGN - 1;
5206 p = kzalloc(alloc_size, GFP_KERNEL);
5208 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5212 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5214 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5219 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5220 dev->padded = (char *)dev - (char *)p;
5222 if (dev_addr_init(dev))
5225 dev_unicast_init(dev);
5227 dev_net_set(dev, &init_net);
5230 dev->num_tx_queues = queue_count;
5231 dev->real_num_tx_queues = queue_count;
5233 dev->gso_max_size = GSO_MAX_SIZE;
5235 netdev_init_queues(dev);
5237 INIT_LIST_HEAD(&dev->napi_list);
5238 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5240 strcpy(dev->name, name);
5250 EXPORT_SYMBOL(alloc_netdev_mq);
5253 * free_netdev - free network device
5256 * This function does the last stage of destroying an allocated device
5257 * interface. The reference to the device object is released.
5258 * If this is the last reference then it will be freed.
5260 void free_netdev(struct net_device *dev)
5262 struct napi_struct *p, *n;
5264 release_net(dev_net(dev));
5268 /* Flush device addresses */
5269 dev_addr_flush(dev);
5271 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5274 /* Compatibility with error handling in drivers */
5275 if (dev->reg_state == NETREG_UNINITIALIZED) {
5276 kfree((char *)dev - dev->padded);
5280 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5281 dev->reg_state = NETREG_RELEASED;
5283 /* will free via device release */
5284 put_device(&dev->dev);
5286 EXPORT_SYMBOL(free_netdev);
5289 * synchronize_net - Synchronize with packet receive processing
5291 * Wait for packets currently being received to be done.
5292 * Does not block later packets from starting.
5294 void synchronize_net(void)
5299 EXPORT_SYMBOL(synchronize_net);
5302 * unregister_netdevice_queue - remove device from the kernel
5306 * This function shuts down a device interface and removes it
5307 * from the kernel tables.
5308 * If head not NULL, device is queued to be unregistered later.
5310 * Callers must hold the rtnl semaphore. You may want
5311 * unregister_netdev() instead of this.
5314 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
5319 list_add_tail(&dev->unreg_list, head);
5321 rollback_registered(dev);
5322 /* Finish processing unregister after unlock */
5326 EXPORT_SYMBOL(unregister_netdevice_queue);
5329 * unregister_netdevice_many - unregister many devices
5330 * @head: list of devices
5333 void unregister_netdevice_many(struct list_head *head)
5335 struct net_device *dev;
5337 if (!list_empty(head)) {
5338 rollback_registered_many(head);
5339 list_for_each_entry(dev, head, unreg_list)
5343 EXPORT_SYMBOL(unregister_netdevice_many);
5346 * unregister_netdev - remove device from the kernel
5349 * This function shuts down a device interface and removes it
5350 * from the kernel tables.
5352 * This is just a wrapper for unregister_netdevice that takes
5353 * the rtnl semaphore. In general you want to use this and not
5354 * unregister_netdevice.
5356 void unregister_netdev(struct net_device *dev)
5359 unregister_netdevice(dev);
5362 EXPORT_SYMBOL(unregister_netdev);
5365 * dev_change_net_namespace - move device to different nethost namespace
5367 * @net: network namespace
5368 * @pat: If not NULL name pattern to try if the current device name
5369 * is already taken in the destination network namespace.
5371 * This function shuts down a device interface and moves it
5372 * to a new network namespace. On success 0 is returned, on
5373 * a failure a netagive errno code is returned.
5375 * Callers must hold the rtnl semaphore.
5378 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5381 const char *destname;
5386 /* Don't allow namespace local devices to be moved. */
5388 if (dev->features & NETIF_F_NETNS_LOCAL)
5392 /* Don't allow real devices to be moved when sysfs
5396 if (dev->dev.parent)
5400 /* Ensure the device has been registrered */
5402 if (dev->reg_state != NETREG_REGISTERED)
5405 /* Get out if there is nothing todo */
5407 if (net_eq(dev_net(dev), net))
5410 /* Pick the destination device name, and ensure
5411 * we can use it in the destination network namespace.
5414 destname = dev->name;
5415 if (__dev_get_by_name(net, destname)) {
5416 /* We get here if we can't use the current device name */
5419 if (!dev_valid_name(pat))
5421 if (strchr(pat, '%')) {
5422 if (__dev_alloc_name(net, pat, buf) < 0)
5427 if (__dev_get_by_name(net, destname))
5432 * And now a mini version of register_netdevice unregister_netdevice.
5435 /* If device is running close it first. */
5438 /* And unlink it from device chain */
5440 unlist_netdevice(dev);
5444 /* Shutdown queueing discipline. */
5447 /* Notify protocols, that we are about to destroy
5448 this device. They should clean all the things.
5450 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5453 * Flush the unicast and multicast chains
5455 dev_unicast_flush(dev);
5456 dev_addr_discard(dev);
5458 netdev_unregister_kobject(dev);
5460 /* Actually switch the network namespace */
5461 dev_net_set(dev, net);
5463 /* Assign the new device name */
5464 if (destname != dev->name)
5465 strcpy(dev->name, destname);
5467 /* If there is an ifindex conflict assign a new one */
5468 if (__dev_get_by_index(net, dev->ifindex)) {
5469 int iflink = (dev->iflink == dev->ifindex);
5470 dev->ifindex = dev_new_index(net);
5472 dev->iflink = dev->ifindex;
5475 /* Fixup kobjects */
5476 err = netdev_register_kobject(dev);
5479 /* Add the device back in the hashes */
5480 list_netdevice(dev);
5482 /* Notify protocols, that a new device appeared. */
5483 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5490 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5492 static int dev_cpu_callback(struct notifier_block *nfb,
5493 unsigned long action,
5496 struct sk_buff **list_skb;
5497 struct Qdisc **list_net;
5498 struct sk_buff *skb;
5499 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5500 struct softnet_data *sd, *oldsd;
5502 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5505 local_irq_disable();
5506 cpu = smp_processor_id();
5507 sd = &per_cpu(softnet_data, cpu);
5508 oldsd = &per_cpu(softnet_data, oldcpu);
5510 /* Find end of our completion_queue. */
5511 list_skb = &sd->completion_queue;
5513 list_skb = &(*list_skb)->next;
5514 /* Append completion queue from offline CPU. */
5515 *list_skb = oldsd->completion_queue;
5516 oldsd->completion_queue = NULL;
5518 /* Find end of our output_queue. */
5519 list_net = &sd->output_queue;
5521 list_net = &(*list_net)->next_sched;
5522 /* Append output queue from offline CPU. */
5523 *list_net = oldsd->output_queue;
5524 oldsd->output_queue = NULL;
5526 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5529 /* Process offline CPU's input_pkt_queue */
5530 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
5538 * netdev_increment_features - increment feature set by one
5539 * @all: current feature set
5540 * @one: new feature set
5541 * @mask: mask feature set
5543 * Computes a new feature set after adding a device with feature set
5544 * @one to the master device with current feature set @all. Will not
5545 * enable anything that is off in @mask. Returns the new feature set.
5547 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5550 /* If device needs checksumming, downgrade to it. */
5551 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5552 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5553 else if (mask & NETIF_F_ALL_CSUM) {
5554 /* If one device supports v4/v6 checksumming, set for all. */
5555 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5556 !(all & NETIF_F_GEN_CSUM)) {
5557 all &= ~NETIF_F_ALL_CSUM;
5558 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5561 /* If one device supports hw checksumming, set for all. */
5562 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5563 all &= ~NETIF_F_ALL_CSUM;
5564 all |= NETIF_F_HW_CSUM;
5568 one |= NETIF_F_ALL_CSUM;
5570 one |= all & NETIF_F_ONE_FOR_ALL;
5571 all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5572 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5576 EXPORT_SYMBOL(netdev_increment_features);
5578 static struct hlist_head *netdev_create_hash(void)
5581 struct hlist_head *hash;
5583 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5585 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5586 INIT_HLIST_HEAD(&hash[i]);
5591 /* Initialize per network namespace state */
5592 static int __net_init netdev_init(struct net *net)
5594 INIT_LIST_HEAD(&net->dev_base_head);
5596 net->dev_name_head = netdev_create_hash();
5597 if (net->dev_name_head == NULL)
5600 net->dev_index_head = netdev_create_hash();
5601 if (net->dev_index_head == NULL)
5607 kfree(net->dev_name_head);
5613 * netdev_drivername - network driver for the device
5614 * @dev: network device
5615 * @buffer: buffer for resulting name
5616 * @len: size of buffer
5618 * Determine network driver for device.
5620 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5622 const struct device_driver *driver;
5623 const struct device *parent;
5625 if (len <= 0 || !buffer)
5629 parent = dev->dev.parent;
5634 driver = parent->driver;
5635 if (driver && driver->name)
5636 strlcpy(buffer, driver->name, len);
5640 static void __net_exit netdev_exit(struct net *net)
5642 kfree(net->dev_name_head);
5643 kfree(net->dev_index_head);
5646 static struct pernet_operations __net_initdata netdev_net_ops = {
5647 .init = netdev_init,
5648 .exit = netdev_exit,
5651 static void __net_exit default_device_exit(struct net *net)
5653 struct net_device *dev;
5655 * Push all migratable of the network devices back to the
5656 * initial network namespace
5660 for_each_netdev(net, dev) {
5662 char fb_name[IFNAMSIZ];
5664 /* Ignore unmoveable devices (i.e. loopback) */
5665 if (dev->features & NETIF_F_NETNS_LOCAL)
5668 /* Delete virtual devices */
5669 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) {
5670 dev->rtnl_link_ops->dellink(dev, NULL);
5674 /* Push remaing network devices to init_net */
5675 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5676 err = dev_change_net_namespace(dev, &init_net, fb_name);
5678 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5679 __func__, dev->name, err);
5687 static struct pernet_operations __net_initdata default_device_ops = {
5688 .exit = default_device_exit,
5692 * Initialize the DEV module. At boot time this walks the device list and
5693 * unhooks any devices that fail to initialise (normally hardware not
5694 * present) and leaves us with a valid list of present and active devices.
5699 * This is called single threaded during boot, so no need
5700 * to take the rtnl semaphore.
5702 static int __init net_dev_init(void)
5704 int i, rc = -ENOMEM;
5706 BUG_ON(!dev_boot_phase);
5708 if (dev_proc_init())
5711 if (netdev_kobject_init())
5714 INIT_LIST_HEAD(&ptype_all);
5715 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5716 INIT_LIST_HEAD(&ptype_base[i]);
5718 if (register_pernet_subsys(&netdev_net_ops))
5722 * Initialise the packet receive queues.
5725 for_each_possible_cpu(i) {
5726 struct softnet_data *queue;
5728 queue = &per_cpu(softnet_data, i);
5729 skb_queue_head_init(&queue->input_pkt_queue);
5730 queue->completion_queue = NULL;
5731 INIT_LIST_HEAD(&queue->poll_list);
5733 queue->backlog.poll = process_backlog;
5734 queue->backlog.weight = weight_p;
5735 queue->backlog.gro_list = NULL;
5736 queue->backlog.gro_count = 0;
5741 /* The loopback device is special if any other network devices
5742 * is present in a network namespace the loopback device must
5743 * be present. Since we now dynamically allocate and free the
5744 * loopback device ensure this invariant is maintained by
5745 * keeping the loopback device as the first device on the
5746 * list of network devices. Ensuring the loopback devices
5747 * is the first device that appears and the last network device
5750 if (register_pernet_device(&loopback_net_ops))
5753 if (register_pernet_device(&default_device_ops))
5756 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5757 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5759 hotcpu_notifier(dev_cpu_callback, 0);
5767 subsys_initcall(net_dev_init);
5769 static int __init initialize_hashrnd(void)
5771 get_random_bytes(&skb_tx_hashrnd, sizeof(skb_tx_hashrnd));
5775 late_initcall_sync(initialize_hashrnd);