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/notifier.h>
94 #include <linux/skbuff.h>
95 #include <net/net_namespace.h>
97 #include <linux/rtnetlink.h>
98 #include <linux/proc_fs.h>
99 #include <linux/seq_file.h>
100 #include <linux/stat.h>
101 #include <linux/if_bridge.h>
102 #include <linux/if_macvlan.h>
104 #include <net/pkt_sched.h>
105 #include <net/checksum.h>
106 #include <linux/highmem.h>
107 #include <linux/init.h>
108 #include <linux/kmod.h>
109 #include <linux/module.h>
110 #include <linux/kallsyms.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>
124 #include "net-sysfs.h"
127 * The list of packet types we will receive (as opposed to discard)
128 * and the routines to invoke.
130 * Why 16. Because with 16 the only overlap we get on a hash of the
131 * low nibble of the protocol value is RARP/SNAP/X.25.
133 * NOTE: That is no longer true with the addition of VLAN tags. Not
134 * sure which should go first, but I bet it won't make much
135 * difference if we are running VLANs. The good news is that
136 * this protocol won't be in the list unless compiled in, so
137 * the average user (w/out VLANs) will not be adversely affected.
154 #define PTYPE_HASH_SIZE (16)
155 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
157 static DEFINE_SPINLOCK(ptype_lock);
158 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
159 static struct list_head ptype_all __read_mostly; /* Taps */
161 #ifdef CONFIG_NET_DMA
163 struct dma_client client;
165 cpumask_t channel_mask;
166 struct dma_chan **channels;
169 static enum dma_state_client
170 netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
171 enum dma_state state);
173 static struct net_dma net_dma = {
175 .event_callback = netdev_dma_event,
181 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
184 * Pure readers hold dev_base_lock for reading.
186 * Writers must hold the rtnl semaphore while they loop through the
187 * dev_base_head list, and hold dev_base_lock for writing when they do the
188 * actual updates. This allows pure readers to access the list even
189 * while a writer is preparing to update it.
191 * To put it another way, dev_base_lock is held for writing only to
192 * protect against pure readers; the rtnl semaphore provides the
193 * protection against other writers.
195 * See, for example usages, register_netdevice() and
196 * unregister_netdevice(), which must be called with the rtnl
199 DEFINE_RWLOCK(dev_base_lock);
201 EXPORT_SYMBOL(dev_base_lock);
203 #define NETDEV_HASHBITS 8
204 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
206 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
208 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
209 return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
212 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
214 return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
217 /* Device list insertion */
218 static int list_netdevice(struct net_device *dev)
220 struct net *net = dev_net(dev);
224 write_lock_bh(&dev_base_lock);
225 list_add_tail(&dev->dev_list, &net->dev_base_head);
226 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
227 hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
228 write_unlock_bh(&dev_base_lock);
232 /* Device list removal */
233 static void unlist_netdevice(struct net_device *dev)
237 /* Unlink dev from the device chain */
238 write_lock_bh(&dev_base_lock);
239 list_del(&dev->dev_list);
240 hlist_del(&dev->name_hlist);
241 hlist_del(&dev->index_hlist);
242 write_unlock_bh(&dev_base_lock);
249 static RAW_NOTIFIER_HEAD(netdev_chain);
252 * Device drivers call our routines to queue packets here. We empty the
253 * queue in the local softnet handler.
256 DEFINE_PER_CPU(struct softnet_data, softnet_data);
258 #ifdef CONFIG_DEBUG_LOCK_ALLOC
260 * register_netdevice() inits dev->_xmit_lock and sets lockdep class
261 * according to dev->type
263 static const unsigned short netdev_lock_type[] =
264 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
265 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
266 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
267 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
268 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
269 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
270 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
271 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
272 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
273 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
274 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
275 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
276 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
277 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID,
280 static const char *netdev_lock_name[] =
281 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
282 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
283 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
284 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
285 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
286 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
287 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
288 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
289 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
290 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
291 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
292 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
293 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
294 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID",
297 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
299 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
303 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
304 if (netdev_lock_type[i] == dev_type)
306 /* the last key is used by default */
307 return ARRAY_SIZE(netdev_lock_type) - 1;
310 static inline void netdev_set_lockdep_class(spinlock_t *lock,
311 unsigned short dev_type)
315 i = netdev_lock_pos(dev_type);
316 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
317 netdev_lock_name[i]);
320 static inline void netdev_set_lockdep_class(spinlock_t *lock,
321 unsigned short dev_type)
326 /*******************************************************************************
328 Protocol management and registration routines
330 *******************************************************************************/
333 * Add a protocol ID to the list. Now that the input handler is
334 * smarter we can dispense with all the messy stuff that used to be
337 * BEWARE!!! Protocol handlers, mangling input packets,
338 * MUST BE last in hash buckets and checking protocol handlers
339 * MUST start from promiscuous ptype_all chain in net_bh.
340 * It is true now, do not change it.
341 * Explanation follows: if protocol handler, mangling packet, will
342 * be the first on list, it is not able to sense, that packet
343 * is cloned and should be copied-on-write, so that it will
344 * change it and subsequent readers will get broken packet.
349 * dev_add_pack - add packet handler
350 * @pt: packet type declaration
352 * Add a protocol handler to the networking stack. The passed &packet_type
353 * is linked into kernel lists and may not be freed until it has been
354 * removed from the kernel lists.
356 * This call does not sleep therefore it can not
357 * guarantee all CPU's that are in middle of receiving packets
358 * will see the new packet type (until the next received packet).
361 void dev_add_pack(struct packet_type *pt)
365 spin_lock_bh(&ptype_lock);
366 if (pt->type == htons(ETH_P_ALL))
367 list_add_rcu(&pt->list, &ptype_all);
369 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
370 list_add_rcu(&pt->list, &ptype_base[hash]);
372 spin_unlock_bh(&ptype_lock);
376 * __dev_remove_pack - remove packet handler
377 * @pt: packet type declaration
379 * Remove a protocol handler that was previously added to the kernel
380 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
381 * from the kernel lists and can be freed or reused once this function
384 * The packet type might still be in use by receivers
385 * and must not be freed until after all the CPU's have gone
386 * through a quiescent state.
388 void __dev_remove_pack(struct packet_type *pt)
390 struct list_head *head;
391 struct packet_type *pt1;
393 spin_lock_bh(&ptype_lock);
395 if (pt->type == htons(ETH_P_ALL))
398 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
400 list_for_each_entry(pt1, head, list) {
402 list_del_rcu(&pt->list);
407 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
409 spin_unlock_bh(&ptype_lock);
412 * dev_remove_pack - remove packet handler
413 * @pt: packet type declaration
415 * Remove a protocol handler that was previously added to the kernel
416 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
417 * from the kernel lists and can be freed or reused once this function
420 * This call sleeps to guarantee that no CPU is looking at the packet
423 void dev_remove_pack(struct packet_type *pt)
425 __dev_remove_pack(pt);
430 /******************************************************************************
432 Device Boot-time Settings Routines
434 *******************************************************************************/
436 /* Boot time configuration table */
437 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
440 * netdev_boot_setup_add - add new setup entry
441 * @name: name of the device
442 * @map: configured settings for the device
444 * Adds new setup entry to the dev_boot_setup list. The function
445 * returns 0 on error and 1 on success. This is a generic routine to
448 static int netdev_boot_setup_add(char *name, struct ifmap *map)
450 struct netdev_boot_setup *s;
454 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
455 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
456 memset(s[i].name, 0, sizeof(s[i].name));
457 strcpy(s[i].name, name);
458 memcpy(&s[i].map, map, sizeof(s[i].map));
463 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
467 * netdev_boot_setup_check - check boot time settings
468 * @dev: the netdevice
470 * Check boot time settings for the device.
471 * The found settings are set for the device to be used
472 * later in the device probing.
473 * Returns 0 if no settings found, 1 if they are.
475 int netdev_boot_setup_check(struct net_device *dev)
477 struct netdev_boot_setup *s = dev_boot_setup;
480 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
481 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
482 !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
483 dev->irq = s[i].map.irq;
484 dev->base_addr = s[i].map.base_addr;
485 dev->mem_start = s[i].map.mem_start;
486 dev->mem_end = s[i].map.mem_end;
495 * netdev_boot_base - get address from boot time settings
496 * @prefix: prefix for network device
497 * @unit: id for network device
499 * Check boot time settings for the base address of device.
500 * The found settings are set for the device to be used
501 * later in the device probing.
502 * Returns 0 if no settings found.
504 unsigned long netdev_boot_base(const char *prefix, int unit)
506 const struct netdev_boot_setup *s = dev_boot_setup;
510 sprintf(name, "%s%d", prefix, unit);
513 * If device already registered then return base of 1
514 * to indicate not to probe for this interface
516 if (__dev_get_by_name(&init_net, name))
519 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
520 if (!strcmp(name, s[i].name))
521 return s[i].map.base_addr;
526 * Saves at boot time configured settings for any netdevice.
528 int __init netdev_boot_setup(char *str)
533 str = get_options(str, ARRAY_SIZE(ints), ints);
538 memset(&map, 0, sizeof(map));
542 map.base_addr = ints[2];
544 map.mem_start = ints[3];
546 map.mem_end = ints[4];
548 /* Add new entry to the list */
549 return netdev_boot_setup_add(str, &map);
552 __setup("netdev=", netdev_boot_setup);
554 /*******************************************************************************
556 Device Interface Subroutines
558 *******************************************************************************/
561 * __dev_get_by_name - find a device by its name
562 * @net: the applicable net namespace
563 * @name: name to find
565 * Find an interface by name. Must be called under RTNL semaphore
566 * or @dev_base_lock. If the name is found a pointer to the device
567 * is returned. If the name is not found then %NULL is returned. The
568 * reference counters are not incremented so the caller must be
569 * careful with locks.
572 struct net_device *__dev_get_by_name(struct net *net, const char *name)
574 struct hlist_node *p;
576 hlist_for_each(p, dev_name_hash(net, name)) {
577 struct net_device *dev
578 = hlist_entry(p, struct net_device, name_hlist);
579 if (!strncmp(dev->name, name, IFNAMSIZ))
586 * dev_get_by_name - find a device by its name
587 * @net: the applicable net namespace
588 * @name: name to find
590 * Find an interface by name. This can be called from any
591 * context and does its own locking. The returned handle has
592 * the usage count incremented and the caller must use dev_put() to
593 * release it when it is no longer needed. %NULL is returned if no
594 * matching device is found.
597 struct net_device *dev_get_by_name(struct net *net, const char *name)
599 struct net_device *dev;
601 read_lock(&dev_base_lock);
602 dev = __dev_get_by_name(net, name);
605 read_unlock(&dev_base_lock);
610 * __dev_get_by_index - find a device by its ifindex
611 * @net: the applicable net namespace
612 * @ifindex: index of device
614 * Search for an interface by index. Returns %NULL if the device
615 * is not found or a pointer to the device. The device has not
616 * had its reference counter increased so the caller must be careful
617 * about locking. The caller must hold either the RTNL semaphore
621 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
623 struct hlist_node *p;
625 hlist_for_each(p, dev_index_hash(net, ifindex)) {
626 struct net_device *dev
627 = hlist_entry(p, struct net_device, index_hlist);
628 if (dev->ifindex == ifindex)
636 * dev_get_by_index - find a device by its ifindex
637 * @net: the applicable net namespace
638 * @ifindex: index of device
640 * Search for an interface by index. Returns NULL if the device
641 * is not found or a pointer to the device. The device returned has
642 * had a reference added and the pointer is safe until the user calls
643 * dev_put to indicate they have finished with it.
646 struct net_device *dev_get_by_index(struct net *net, int ifindex)
648 struct net_device *dev;
650 read_lock(&dev_base_lock);
651 dev = __dev_get_by_index(net, ifindex);
654 read_unlock(&dev_base_lock);
659 * dev_getbyhwaddr - find a device by its hardware address
660 * @net: the applicable net namespace
661 * @type: media type of device
662 * @ha: hardware address
664 * Search for an interface by MAC address. Returns NULL if the device
665 * is not found or a pointer to the device. The caller must hold the
666 * rtnl semaphore. The returned device has not had its ref count increased
667 * and the caller must therefore be careful about locking
670 * If the API was consistent this would be __dev_get_by_hwaddr
673 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
675 struct net_device *dev;
679 for_each_netdev(net, dev)
680 if (dev->type == type &&
681 !memcmp(dev->dev_addr, ha, dev->addr_len))
687 EXPORT_SYMBOL(dev_getbyhwaddr);
689 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
691 struct net_device *dev;
694 for_each_netdev(net, dev)
695 if (dev->type == type)
701 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
703 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
705 struct net_device *dev;
708 dev = __dev_getfirstbyhwtype(net, type);
715 EXPORT_SYMBOL(dev_getfirstbyhwtype);
718 * dev_get_by_flags - find any device with given flags
719 * @net: the applicable net namespace
720 * @if_flags: IFF_* values
721 * @mask: bitmask of bits in if_flags to check
723 * Search for any interface with the given flags. Returns NULL if a device
724 * is not found or a pointer to the device. The device returned has
725 * had a reference added and the pointer is safe until the user calls
726 * dev_put to indicate they have finished with it.
729 struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
731 struct net_device *dev, *ret;
734 read_lock(&dev_base_lock);
735 for_each_netdev(net, dev) {
736 if (((dev->flags ^ if_flags) & mask) == 0) {
742 read_unlock(&dev_base_lock);
747 * dev_valid_name - check if name is okay for network device
750 * Network device names need to be valid file names to
751 * to allow sysfs to work. We also disallow any kind of
754 int dev_valid_name(const char *name)
758 if (strlen(name) >= IFNAMSIZ)
760 if (!strcmp(name, ".") || !strcmp(name, ".."))
764 if (*name == '/' || isspace(*name))
772 * __dev_alloc_name - allocate a name for a device
773 * @net: network namespace to allocate the device name in
774 * @name: name format string
775 * @buf: scratch buffer and result name string
777 * Passed a format string - eg "lt%d" it will try and find a suitable
778 * id. It scans list of devices to build up a free map, then chooses
779 * the first empty slot. The caller must hold the dev_base or rtnl lock
780 * while allocating the name and adding the device in order to avoid
782 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
783 * Returns the number of the unit assigned or a negative errno code.
786 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
790 const int max_netdevices = 8*PAGE_SIZE;
791 unsigned long *inuse;
792 struct net_device *d;
794 p = strnchr(name, IFNAMSIZ-1, '%');
797 * Verify the string as this thing may have come from
798 * the user. There must be either one "%d" and no other "%"
801 if (p[1] != 'd' || strchr(p + 2, '%'))
804 /* Use one page as a bit array of possible slots */
805 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
809 for_each_netdev(net, d) {
810 if (!sscanf(d->name, name, &i))
812 if (i < 0 || i >= max_netdevices)
815 /* avoid cases where sscanf is not exact inverse of printf */
816 snprintf(buf, IFNAMSIZ, name, i);
817 if (!strncmp(buf, d->name, IFNAMSIZ))
821 i = find_first_zero_bit(inuse, max_netdevices);
822 free_page((unsigned long) inuse);
825 snprintf(buf, IFNAMSIZ, name, i);
826 if (!__dev_get_by_name(net, buf))
829 /* It is possible to run out of possible slots
830 * when the name is long and there isn't enough space left
831 * for the digits, or if all bits are used.
837 * dev_alloc_name - allocate a name for a device
839 * @name: name format string
841 * Passed a format string - eg "lt%d" it will try and find a suitable
842 * id. It scans list of devices to build up a free map, then chooses
843 * the first empty slot. The caller must hold the dev_base or rtnl lock
844 * while allocating the name and adding the device in order to avoid
846 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
847 * Returns the number of the unit assigned or a negative errno code.
850 int dev_alloc_name(struct net_device *dev, const char *name)
856 BUG_ON(!dev_net(dev));
858 ret = __dev_alloc_name(net, name, buf);
860 strlcpy(dev->name, buf, IFNAMSIZ);
866 * dev_change_name - change name of a device
868 * @newname: name (or format string) must be at least IFNAMSIZ
870 * Change name of a device, can pass format strings "eth%d".
873 int dev_change_name(struct net_device *dev, char *newname)
875 char oldname[IFNAMSIZ];
881 BUG_ON(!dev_net(dev));
884 if (dev->flags & IFF_UP)
887 if (!dev_valid_name(newname))
890 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
893 memcpy(oldname, dev->name, IFNAMSIZ);
895 if (strchr(newname, '%')) {
896 err = dev_alloc_name(dev, newname);
899 strcpy(newname, dev->name);
901 else if (__dev_get_by_name(net, newname))
904 strlcpy(dev->name, newname, IFNAMSIZ);
907 err = device_rename(&dev->dev, dev->name);
909 memcpy(dev->name, oldname, IFNAMSIZ);
913 write_lock_bh(&dev_base_lock);
914 hlist_del(&dev->name_hlist);
915 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
916 write_unlock_bh(&dev_base_lock);
918 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
919 ret = notifier_to_errno(ret);
924 "%s: name change rollback failed: %d.\n",
928 memcpy(dev->name, oldname, IFNAMSIZ);
937 * netdev_features_change - device changes features
938 * @dev: device to cause notification
940 * Called to indicate a device has changed features.
942 void netdev_features_change(struct net_device *dev)
944 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
946 EXPORT_SYMBOL(netdev_features_change);
949 * netdev_state_change - device changes state
950 * @dev: device to cause notification
952 * Called to indicate a device has changed state. This function calls
953 * the notifier chains for netdev_chain and sends a NEWLINK message
954 * to the routing socket.
956 void netdev_state_change(struct net_device *dev)
958 if (dev->flags & IFF_UP) {
959 call_netdevice_notifiers(NETDEV_CHANGE, dev);
960 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
964 void netdev_bonding_change(struct net_device *dev)
966 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
968 EXPORT_SYMBOL(netdev_bonding_change);
971 * dev_load - load a network module
972 * @net: the applicable net namespace
973 * @name: name of interface
975 * If a network interface is not present and the process has suitable
976 * privileges this function loads the module. If module loading is not
977 * available in this kernel then it becomes a nop.
980 void dev_load(struct net *net, const char *name)
982 struct net_device *dev;
984 read_lock(&dev_base_lock);
985 dev = __dev_get_by_name(net, name);
986 read_unlock(&dev_base_lock);
988 if (!dev && capable(CAP_SYS_MODULE))
989 request_module("%s", name);
993 * dev_open - prepare an interface for use.
994 * @dev: device to open
996 * Takes a device from down to up state. The device's private open
997 * function is invoked and then the multicast lists are loaded. Finally
998 * the device is moved into the up state and a %NETDEV_UP message is
999 * sent to the netdev notifier chain.
1001 * Calling this function on an active interface is a nop. On a failure
1002 * a negative errno code is returned.
1004 int dev_open(struct net_device *dev)
1014 if (dev->flags & IFF_UP)
1018 * Is it even present?
1020 if (!netif_device_present(dev))
1024 * Call device private open method
1026 set_bit(__LINK_STATE_START, &dev->state);
1028 if (dev->validate_addr)
1029 ret = dev->validate_addr(dev);
1031 if (!ret && dev->open)
1032 ret = dev->open(dev);
1035 * If it went open OK then:
1039 clear_bit(__LINK_STATE_START, &dev->state);
1044 dev->flags |= IFF_UP;
1047 * Initialize multicasting status
1049 dev_set_rx_mode(dev);
1052 * Wakeup transmit queue engine
1057 * ... and announce new interface.
1059 call_netdevice_notifiers(NETDEV_UP, dev);
1066 * dev_close - shutdown an interface.
1067 * @dev: device to shutdown
1069 * This function moves an active device into down state. A
1070 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1071 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1074 int dev_close(struct net_device *dev)
1080 if (!(dev->flags & IFF_UP))
1084 * Tell people we are going down, so that they can
1085 * prepare to death, when device is still operating.
1087 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1089 clear_bit(__LINK_STATE_START, &dev->state);
1091 /* Synchronize to scheduled poll. We cannot touch poll list,
1092 * it can be even on different cpu. So just clear netif_running().
1094 * dev->stop() will invoke napi_disable() on all of it's
1095 * napi_struct instances on this device.
1097 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1099 dev_deactivate(dev);
1102 * Call the device specific close. This cannot fail.
1103 * Only if device is UP
1105 * We allow it to be called even after a DETACH hot-plug
1112 * Device is now down.
1115 dev->flags &= ~IFF_UP;
1118 * Tell people we are down
1120 call_netdevice_notifiers(NETDEV_DOWN, dev);
1126 static int dev_boot_phase = 1;
1129 * Device change register/unregister. These are not inline or static
1130 * as we export them to the world.
1134 * register_netdevice_notifier - register a network notifier block
1137 * Register a notifier to be called when network device events occur.
1138 * The notifier passed is linked into the kernel structures and must
1139 * not be reused until it has been unregistered. A negative errno code
1140 * is returned on a failure.
1142 * When registered all registration and up events are replayed
1143 * to the new notifier to allow device to have a race free
1144 * view of the network device list.
1147 int register_netdevice_notifier(struct notifier_block *nb)
1149 struct net_device *dev;
1150 struct net_device *last;
1155 err = raw_notifier_chain_register(&netdev_chain, nb);
1161 for_each_netdev(net, dev) {
1162 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1163 err = notifier_to_errno(err);
1167 if (!(dev->flags & IFF_UP))
1170 nb->notifier_call(nb, NETDEV_UP, dev);
1181 for_each_netdev(net, dev) {
1185 if (dev->flags & IFF_UP) {
1186 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1187 nb->notifier_call(nb, NETDEV_DOWN, dev);
1189 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1193 raw_notifier_chain_unregister(&netdev_chain, nb);
1198 * unregister_netdevice_notifier - unregister a network notifier block
1201 * Unregister a notifier previously registered by
1202 * register_netdevice_notifier(). The notifier is unlinked into the
1203 * kernel structures and may then be reused. A negative errno code
1204 * is returned on a failure.
1207 int unregister_netdevice_notifier(struct notifier_block *nb)
1212 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1218 * call_netdevice_notifiers - call all network notifier blocks
1219 * @val: value passed unmodified to notifier function
1220 * @dev: net_device pointer passed unmodified to notifier function
1222 * Call all network notifier blocks. Parameters and return value
1223 * are as for raw_notifier_call_chain().
1226 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1228 return raw_notifier_call_chain(&netdev_chain, val, dev);
1231 /* When > 0 there are consumers of rx skb time stamps */
1232 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1234 void net_enable_timestamp(void)
1236 atomic_inc(&netstamp_needed);
1239 void net_disable_timestamp(void)
1241 atomic_dec(&netstamp_needed);
1244 static inline void net_timestamp(struct sk_buff *skb)
1246 if (atomic_read(&netstamp_needed))
1247 __net_timestamp(skb);
1249 skb->tstamp.tv64 = 0;
1253 * Support routine. Sends outgoing frames to any network
1254 * taps currently in use.
1257 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1259 struct packet_type *ptype;
1264 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1265 /* Never send packets back to the socket
1266 * they originated from - MvS (miquels@drinkel.ow.org)
1268 if ((ptype->dev == dev || !ptype->dev) &&
1269 (ptype->af_packet_priv == NULL ||
1270 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1271 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1275 /* skb->nh should be correctly
1276 set by sender, so that the second statement is
1277 just protection against buggy protocols.
1279 skb_reset_mac_header(skb2);
1281 if (skb_network_header(skb2) < skb2->data ||
1282 skb2->network_header > skb2->tail) {
1283 if (net_ratelimit())
1284 printk(KERN_CRIT "protocol %04x is "
1286 skb2->protocol, dev->name);
1287 skb_reset_network_header(skb2);
1290 skb2->transport_header = skb2->network_header;
1291 skb2->pkt_type = PACKET_OUTGOING;
1292 ptype->func(skb2, skb->dev, ptype, skb->dev);
1299 void __netif_schedule(struct net_device *dev)
1301 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
1302 unsigned long flags;
1303 struct softnet_data *sd;
1305 local_irq_save(flags);
1306 sd = &__get_cpu_var(softnet_data);
1307 dev->next_sched = sd->output_queue;
1308 sd->output_queue = dev;
1309 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1310 local_irq_restore(flags);
1313 EXPORT_SYMBOL(__netif_schedule);
1315 void dev_kfree_skb_irq(struct sk_buff *skb)
1317 if (atomic_dec_and_test(&skb->users)) {
1318 struct softnet_data *sd;
1319 unsigned long flags;
1321 local_irq_save(flags);
1322 sd = &__get_cpu_var(softnet_data);
1323 skb->next = sd->completion_queue;
1324 sd->completion_queue = skb;
1325 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1326 local_irq_restore(flags);
1329 EXPORT_SYMBOL(dev_kfree_skb_irq);
1331 void dev_kfree_skb_any(struct sk_buff *skb)
1333 if (in_irq() || irqs_disabled())
1334 dev_kfree_skb_irq(skb);
1338 EXPORT_SYMBOL(dev_kfree_skb_any);
1342 * netif_device_detach - mark device as removed
1343 * @dev: network device
1345 * Mark device as removed from system and therefore no longer available.
1347 void netif_device_detach(struct net_device *dev)
1349 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1350 netif_running(dev)) {
1351 netif_stop_queue(dev);
1354 EXPORT_SYMBOL(netif_device_detach);
1357 * netif_device_attach - mark device as attached
1358 * @dev: network device
1360 * Mark device as attached from system and restart if needed.
1362 void netif_device_attach(struct net_device *dev)
1364 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1365 netif_running(dev)) {
1366 netif_wake_queue(dev);
1367 __netdev_watchdog_up(dev);
1370 EXPORT_SYMBOL(netif_device_attach);
1372 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1374 return ((features & NETIF_F_GEN_CSUM) ||
1375 ((features & NETIF_F_IP_CSUM) &&
1376 protocol == htons(ETH_P_IP)) ||
1377 ((features & NETIF_F_IPV6_CSUM) &&
1378 protocol == htons(ETH_P_IPV6)));
1381 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1383 if (can_checksum_protocol(dev->features, skb->protocol))
1386 if (skb->protocol == htons(ETH_P_8021Q)) {
1387 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1388 if (can_checksum_protocol(dev->features & dev->vlan_features,
1389 veh->h_vlan_encapsulated_proto))
1397 * Invalidate hardware checksum when packet is to be mangled, and
1398 * complete checksum manually on outgoing path.
1400 int skb_checksum_help(struct sk_buff *skb)
1403 int ret = 0, offset;
1405 if (skb->ip_summed == CHECKSUM_COMPLETE)
1406 goto out_set_summed;
1408 if (unlikely(skb_shinfo(skb)->gso_size)) {
1409 /* Let GSO fix up the checksum. */
1410 goto out_set_summed;
1413 offset = skb->csum_start - skb_headroom(skb);
1414 BUG_ON(offset >= skb_headlen(skb));
1415 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1417 offset += skb->csum_offset;
1418 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1420 if (skb_cloned(skb) &&
1421 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1422 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1427 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1429 skb->ip_summed = CHECKSUM_NONE;
1435 * skb_gso_segment - Perform segmentation on skb.
1436 * @skb: buffer to segment
1437 * @features: features for the output path (see dev->features)
1439 * This function segments the given skb and returns a list of segments.
1441 * It may return NULL if the skb requires no segmentation. This is
1442 * only possible when GSO is used for verifying header integrity.
1444 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1446 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1447 struct packet_type *ptype;
1448 __be16 type = skb->protocol;
1451 BUG_ON(skb_shinfo(skb)->frag_list);
1453 skb_reset_mac_header(skb);
1454 skb->mac_len = skb->network_header - skb->mac_header;
1455 __skb_pull(skb, skb->mac_len);
1457 if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
1458 if (skb_header_cloned(skb) &&
1459 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1460 return ERR_PTR(err);
1464 list_for_each_entry_rcu(ptype,
1465 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1466 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1467 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1468 err = ptype->gso_send_check(skb);
1469 segs = ERR_PTR(err);
1470 if (err || skb_gso_ok(skb, features))
1472 __skb_push(skb, (skb->data -
1473 skb_network_header(skb)));
1475 segs = ptype->gso_segment(skb, features);
1481 __skb_push(skb, skb->data - skb_mac_header(skb));
1486 EXPORT_SYMBOL(skb_gso_segment);
1488 /* Take action when hardware reception checksum errors are detected. */
1490 void netdev_rx_csum_fault(struct net_device *dev)
1492 if (net_ratelimit()) {
1493 printk(KERN_ERR "%s: hw csum failure.\n",
1494 dev ? dev->name : "<unknown>");
1498 EXPORT_SYMBOL(netdev_rx_csum_fault);
1501 /* Actually, we should eliminate this check as soon as we know, that:
1502 * 1. IOMMU is present and allows to map all the memory.
1503 * 2. No high memory really exists on this machine.
1506 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1508 #ifdef CONFIG_HIGHMEM
1511 if (dev->features & NETIF_F_HIGHDMA)
1514 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1515 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1523 void (*destructor)(struct sk_buff *skb);
1526 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1528 static void dev_gso_skb_destructor(struct sk_buff *skb)
1530 struct dev_gso_cb *cb;
1533 struct sk_buff *nskb = skb->next;
1535 skb->next = nskb->next;
1538 } while (skb->next);
1540 cb = DEV_GSO_CB(skb);
1542 cb->destructor(skb);
1546 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1547 * @skb: buffer to segment
1549 * This function segments the given skb and stores the list of segments
1552 static int dev_gso_segment(struct sk_buff *skb)
1554 struct net_device *dev = skb->dev;
1555 struct sk_buff *segs;
1556 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1559 segs = skb_gso_segment(skb, features);
1561 /* Verifying header integrity only. */
1566 return PTR_ERR(segs);
1569 DEV_GSO_CB(skb)->destructor = skb->destructor;
1570 skb->destructor = dev_gso_skb_destructor;
1575 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
1577 if (likely(!skb->next)) {
1578 if (!list_empty(&ptype_all))
1579 dev_queue_xmit_nit(skb, dev);
1581 if (netif_needs_gso(dev, skb)) {
1582 if (unlikely(dev_gso_segment(skb)))
1588 return dev->hard_start_xmit(skb, dev);
1593 struct sk_buff *nskb = skb->next;
1596 skb->next = nskb->next;
1598 rc = dev->hard_start_xmit(nskb, dev);
1600 nskb->next = skb->next;
1604 if (unlikely((netif_queue_stopped(dev) ||
1605 netif_subqueue_stopped(dev, skb)) &&
1607 return NETDEV_TX_BUSY;
1608 } while (skb->next);
1610 skb->destructor = DEV_GSO_CB(skb)->destructor;
1618 * dev_queue_xmit - transmit a buffer
1619 * @skb: buffer to transmit
1621 * Queue a buffer for transmission to a network device. The caller must
1622 * have set the device and priority and built the buffer before calling
1623 * this function. The function can be called from an interrupt.
1625 * A negative errno code is returned on a failure. A success does not
1626 * guarantee the frame will be transmitted as it may be dropped due
1627 * to congestion or traffic shaping.
1629 * -----------------------------------------------------------------------------------
1630 * I notice this method can also return errors from the queue disciplines,
1631 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1634 * Regardless of the return value, the skb is consumed, so it is currently
1635 * difficult to retry a send to this method. (You can bump the ref count
1636 * before sending to hold a reference for retry if you are careful.)
1638 * When calling this method, interrupts MUST be enabled. This is because
1639 * the BH enable code must have IRQs enabled so that it will not deadlock.
1643 int dev_queue_xmit(struct sk_buff *skb)
1645 struct net_device *dev = skb->dev;
1649 /* GSO will handle the following emulations directly. */
1650 if (netif_needs_gso(dev, skb))
1653 if (skb_shinfo(skb)->frag_list &&
1654 !(dev->features & NETIF_F_FRAGLIST) &&
1655 __skb_linearize(skb))
1658 /* Fragmented skb is linearized if device does not support SG,
1659 * or if at least one of fragments is in highmem and device
1660 * does not support DMA from it.
1662 if (skb_shinfo(skb)->nr_frags &&
1663 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1664 __skb_linearize(skb))
1667 /* If packet is not checksummed and device does not support
1668 * checksumming for this protocol, complete checksumming here.
1670 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1671 skb_set_transport_header(skb, skb->csum_start -
1673 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
1678 spin_lock_prefetch(&dev->queue_lock);
1680 /* Disable soft irqs for various locks below. Also
1681 * stops preemption for RCU.
1685 /* Updates of qdisc are serialized by queue_lock.
1686 * The struct Qdisc which is pointed to by qdisc is now a
1687 * rcu structure - it may be accessed without acquiring
1688 * a lock (but the structure may be stale.) The freeing of the
1689 * qdisc will be deferred until it's known that there are no
1690 * more references to it.
1692 * If the qdisc has an enqueue function, we still need to
1693 * hold the queue_lock before calling it, since queue_lock
1694 * also serializes access to the device queue.
1697 q = rcu_dereference(dev->qdisc);
1698 #ifdef CONFIG_NET_CLS_ACT
1699 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1702 /* Grab device queue */
1703 spin_lock(&dev->queue_lock);
1706 /* reset queue_mapping to zero */
1707 skb_set_queue_mapping(skb, 0);
1708 rc = q->enqueue(skb, q);
1710 spin_unlock(&dev->queue_lock);
1712 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1715 spin_unlock(&dev->queue_lock);
1718 /* The device has no queue. Common case for software devices:
1719 loopback, all the sorts of tunnels...
1721 Really, it is unlikely that netif_tx_lock protection is necessary
1722 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1724 However, it is possible, that they rely on protection
1727 Check this and shot the lock. It is not prone from deadlocks.
1728 Either shot noqueue qdisc, it is even simpler 8)
1730 if (dev->flags & IFF_UP) {
1731 int cpu = smp_processor_id(); /* ok because BHs are off */
1733 if (dev->xmit_lock_owner != cpu) {
1735 HARD_TX_LOCK(dev, cpu);
1737 if (!netif_queue_stopped(dev) &&
1738 !netif_subqueue_stopped(dev, skb)) {
1740 if (!dev_hard_start_xmit(skb, dev)) {
1741 HARD_TX_UNLOCK(dev);
1745 HARD_TX_UNLOCK(dev);
1746 if (net_ratelimit())
1747 printk(KERN_CRIT "Virtual device %s asks to "
1748 "queue packet!\n", dev->name);
1750 /* Recursion is detected! It is possible,
1752 if (net_ratelimit())
1753 printk(KERN_CRIT "Dead loop on virtual device "
1754 "%s, fix it urgently!\n", dev->name);
1759 rcu_read_unlock_bh();
1765 rcu_read_unlock_bh();
1770 /*=======================================================================
1772 =======================================================================*/
1774 int netdev_max_backlog __read_mostly = 1000;
1775 int netdev_budget __read_mostly = 300;
1776 int weight_p __read_mostly = 64; /* old backlog weight */
1778 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1782 * netif_rx - post buffer to the network code
1783 * @skb: buffer to post
1785 * This function receives a packet from a device driver and queues it for
1786 * the upper (protocol) levels to process. It always succeeds. The buffer
1787 * may be dropped during processing for congestion control or by the
1791 * NET_RX_SUCCESS (no congestion)
1792 * NET_RX_DROP (packet was dropped)
1796 int netif_rx(struct sk_buff *skb)
1798 struct softnet_data *queue;
1799 unsigned long flags;
1801 /* if netpoll wants it, pretend we never saw it */
1802 if (netpoll_rx(skb))
1805 if (!skb->tstamp.tv64)
1809 * The code is rearranged so that the path is the most
1810 * short when CPU is congested, but is still operating.
1812 local_irq_save(flags);
1813 queue = &__get_cpu_var(softnet_data);
1815 __get_cpu_var(netdev_rx_stat).total++;
1816 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1817 if (queue->input_pkt_queue.qlen) {
1820 __skb_queue_tail(&queue->input_pkt_queue, skb);
1821 local_irq_restore(flags);
1822 return NET_RX_SUCCESS;
1825 napi_schedule(&queue->backlog);
1829 __get_cpu_var(netdev_rx_stat).dropped++;
1830 local_irq_restore(flags);
1836 int netif_rx_ni(struct sk_buff *skb)
1841 err = netif_rx(skb);
1842 if (local_softirq_pending())
1849 EXPORT_SYMBOL(netif_rx_ni);
1851 static inline struct net_device *skb_bond(struct sk_buff *skb)
1853 struct net_device *dev = skb->dev;
1856 if (skb_bond_should_drop(skb)) {
1860 skb->dev = dev->master;
1867 static void net_tx_action(struct softirq_action *h)
1869 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1871 if (sd->completion_queue) {
1872 struct sk_buff *clist;
1874 local_irq_disable();
1875 clist = sd->completion_queue;
1876 sd->completion_queue = NULL;
1880 struct sk_buff *skb = clist;
1881 clist = clist->next;
1883 BUG_TRAP(!atomic_read(&skb->users));
1888 if (sd->output_queue) {
1889 struct net_device *head;
1891 local_irq_disable();
1892 head = sd->output_queue;
1893 sd->output_queue = NULL;
1897 struct net_device *dev = head;
1898 head = head->next_sched;
1900 smp_mb__before_clear_bit();
1901 clear_bit(__LINK_STATE_SCHED, &dev->state);
1903 if (spin_trylock(&dev->queue_lock)) {
1905 spin_unlock(&dev->queue_lock);
1907 netif_schedule(dev);
1913 static inline int deliver_skb(struct sk_buff *skb,
1914 struct packet_type *pt_prev,
1915 struct net_device *orig_dev)
1917 atomic_inc(&skb->users);
1918 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1921 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1922 /* These hooks defined here for ATM */
1924 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1925 unsigned char *addr);
1926 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
1929 * If bridge module is loaded call bridging hook.
1930 * returns NULL if packet was consumed.
1932 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
1933 struct sk_buff *skb) __read_mostly;
1934 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
1935 struct packet_type **pt_prev, int *ret,
1936 struct net_device *orig_dev)
1938 struct net_bridge_port *port;
1940 if (skb->pkt_type == PACKET_LOOPBACK ||
1941 (port = rcu_dereference(skb->dev->br_port)) == NULL)
1945 *ret = deliver_skb(skb, *pt_prev, orig_dev);
1949 return br_handle_frame_hook(port, skb);
1952 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
1955 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
1956 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
1957 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
1959 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
1960 struct packet_type **pt_prev,
1962 struct net_device *orig_dev)
1964 if (skb->dev->macvlan_port == NULL)
1968 *ret = deliver_skb(skb, *pt_prev, orig_dev);
1971 return macvlan_handle_frame_hook(skb);
1974 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
1977 #ifdef CONFIG_NET_CLS_ACT
1978 /* TODO: Maybe we should just force sch_ingress to be compiled in
1979 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1980 * a compare and 2 stores extra right now if we dont have it on
1981 * but have CONFIG_NET_CLS_ACT
1982 * NOTE: This doesnt stop any functionality; if you dont have
1983 * the ingress scheduler, you just cant add policies on ingress.
1986 static int ing_filter(struct sk_buff *skb)
1989 struct net_device *dev = skb->dev;
1990 int result = TC_ACT_OK;
1991 u32 ttl = G_TC_RTTL(skb->tc_verd);
1993 if (MAX_RED_LOOP < ttl++) {
1995 "Redir loop detected Dropping packet (%d->%d)\n",
1996 skb->iif, dev->ifindex);
2000 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2001 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2003 spin_lock(&dev->ingress_lock);
2004 if ((q = dev->qdisc_ingress) != NULL)
2005 result = q->enqueue(skb, q);
2006 spin_unlock(&dev->ingress_lock);
2011 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2012 struct packet_type **pt_prev,
2013 int *ret, struct net_device *orig_dev)
2015 if (!skb->dev->qdisc_ingress)
2019 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2022 /* Huh? Why does turning on AF_PACKET affect this? */
2023 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2026 switch (ing_filter(skb)) {
2040 * netif_receive_skb - process receive buffer from network
2041 * @skb: buffer to process
2043 * netif_receive_skb() is the main receive data processing function.
2044 * It always succeeds. The buffer may be dropped during processing
2045 * for congestion control or by the protocol layers.
2047 * This function may only be called from softirq context and interrupts
2048 * should be enabled.
2050 * Return values (usually ignored):
2051 * NET_RX_SUCCESS: no congestion
2052 * NET_RX_DROP: packet was dropped
2054 int netif_receive_skb(struct sk_buff *skb)
2056 struct packet_type *ptype, *pt_prev;
2057 struct net_device *orig_dev;
2058 int ret = NET_RX_DROP;
2061 /* if we've gotten here through NAPI, check netpoll */
2062 if (netpoll_receive_skb(skb))
2065 if (!skb->tstamp.tv64)
2069 skb->iif = skb->dev->ifindex;
2071 orig_dev = skb_bond(skb);
2076 __get_cpu_var(netdev_rx_stat).total++;
2078 skb_reset_network_header(skb);
2079 skb_reset_transport_header(skb);
2080 skb->mac_len = skb->network_header - skb->mac_header;
2086 #ifdef CONFIG_NET_CLS_ACT
2087 if (skb->tc_verd & TC_NCLS) {
2088 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2093 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2094 if (!ptype->dev || ptype->dev == skb->dev) {
2096 ret = deliver_skb(skb, pt_prev, orig_dev);
2101 #ifdef CONFIG_NET_CLS_ACT
2102 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2108 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2111 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2115 type = skb->protocol;
2116 list_for_each_entry_rcu(ptype,
2117 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2118 if (ptype->type == type &&
2119 (!ptype->dev || ptype->dev == skb->dev)) {
2121 ret = deliver_skb(skb, pt_prev, orig_dev);
2127 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2130 /* Jamal, now you will not able to escape explaining
2131 * me how you were going to use this. :-)
2141 static int process_backlog(struct napi_struct *napi, int quota)
2144 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2145 unsigned long start_time = jiffies;
2147 napi->weight = weight_p;
2149 struct sk_buff *skb;
2150 struct net_device *dev;
2152 local_irq_disable();
2153 skb = __skb_dequeue(&queue->input_pkt_queue);
2155 __napi_complete(napi);
2164 netif_receive_skb(skb);
2167 } while (++work < quota && jiffies == start_time);
2173 * __napi_schedule - schedule for receive
2174 * @n: entry to schedule
2176 * The entry's receive function will be scheduled to run
2178 void __napi_schedule(struct napi_struct *n)
2180 unsigned long flags;
2182 local_irq_save(flags);
2183 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2184 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2185 local_irq_restore(flags);
2187 EXPORT_SYMBOL(__napi_schedule);
2190 static void net_rx_action(struct softirq_action *h)
2192 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2193 unsigned long start_time = jiffies;
2194 int budget = netdev_budget;
2197 local_irq_disable();
2199 while (!list_empty(list)) {
2200 struct napi_struct *n;
2203 /* If softirq window is exhuasted then punt.
2205 * Note that this is a slight policy change from the
2206 * previous NAPI code, which would allow up to 2
2207 * jiffies to pass before breaking out. The test
2208 * used to be "jiffies - start_time > 1".
2210 if (unlikely(budget <= 0 || jiffies != start_time))
2215 /* Even though interrupts have been re-enabled, this
2216 * access is safe because interrupts can only add new
2217 * entries to the tail of this list, and only ->poll()
2218 * calls can remove this head entry from the list.
2220 n = list_entry(list->next, struct napi_struct, poll_list);
2222 have = netpoll_poll_lock(n);
2226 /* This NAPI_STATE_SCHED test is for avoiding a race
2227 * with netpoll's poll_napi(). Only the entity which
2228 * obtains the lock and sees NAPI_STATE_SCHED set will
2229 * actually make the ->poll() call. Therefore we avoid
2230 * accidently calling ->poll() when NAPI is not scheduled.
2233 if (test_bit(NAPI_STATE_SCHED, &n->state))
2234 work = n->poll(n, weight);
2236 WARN_ON_ONCE(work > weight);
2240 local_irq_disable();
2242 /* Drivers must not modify the NAPI state if they
2243 * consume the entire weight. In such cases this code
2244 * still "owns" the NAPI instance and therefore can
2245 * move the instance around on the list at-will.
2247 if (unlikely(work == weight)) {
2248 if (unlikely(napi_disable_pending(n)))
2251 list_move_tail(&n->poll_list, list);
2254 netpoll_poll_unlock(have);
2259 #ifdef CONFIG_NET_DMA
2261 * There may not be any more sk_buffs coming right now, so push
2262 * any pending DMA copies to hardware
2264 if (!cpus_empty(net_dma.channel_mask)) {
2266 for_each_cpu_mask(chan_idx, net_dma.channel_mask) {
2267 struct dma_chan *chan = net_dma.channels[chan_idx];
2269 dma_async_memcpy_issue_pending(chan);
2277 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2278 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2282 static gifconf_func_t * gifconf_list [NPROTO];
2285 * register_gifconf - register a SIOCGIF handler
2286 * @family: Address family
2287 * @gifconf: Function handler
2289 * Register protocol dependent address dumping routines. The handler
2290 * that is passed must not be freed or reused until it has been replaced
2291 * by another handler.
2293 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2295 if (family >= NPROTO)
2297 gifconf_list[family] = gifconf;
2303 * Map an interface index to its name (SIOCGIFNAME)
2307 * We need this ioctl for efficient implementation of the
2308 * if_indextoname() function required by the IPv6 API. Without
2309 * it, we would have to search all the interfaces to find a
2313 static int dev_ifname(struct net *net, struct ifreq __user *arg)
2315 struct net_device *dev;
2319 * Fetch the caller's info block.
2322 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2325 read_lock(&dev_base_lock);
2326 dev = __dev_get_by_index(net, ifr.ifr_ifindex);
2328 read_unlock(&dev_base_lock);
2332 strcpy(ifr.ifr_name, dev->name);
2333 read_unlock(&dev_base_lock);
2335 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2341 * Perform a SIOCGIFCONF call. This structure will change
2342 * size eventually, and there is nothing I can do about it.
2343 * Thus we will need a 'compatibility mode'.
2346 static int dev_ifconf(struct net *net, char __user *arg)
2349 struct net_device *dev;
2356 * Fetch the caller's info block.
2359 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2366 * Loop over the interfaces, and write an info block for each.
2370 for_each_netdev(net, dev) {
2371 for (i = 0; i < NPROTO; i++) {
2372 if (gifconf_list[i]) {
2375 done = gifconf_list[i](dev, NULL, 0);
2377 done = gifconf_list[i](dev, pos + total,
2387 * All done. Write the updated control block back to the caller.
2389 ifc.ifc_len = total;
2392 * Both BSD and Solaris return 0 here, so we do too.
2394 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2397 #ifdef CONFIG_PROC_FS
2399 * This is invoked by the /proc filesystem handler to display a device
2402 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2403 __acquires(dev_base_lock)
2405 struct net *net = seq_file_net(seq);
2407 struct net_device *dev;
2409 read_lock(&dev_base_lock);
2411 return SEQ_START_TOKEN;
2414 for_each_netdev(net, dev)
2421 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2423 struct net *net = seq_file_net(seq);
2425 return v == SEQ_START_TOKEN ?
2426 first_net_device(net) : next_net_device((struct net_device *)v);
2429 void dev_seq_stop(struct seq_file *seq, void *v)
2430 __releases(dev_base_lock)
2432 read_unlock(&dev_base_lock);
2435 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2437 struct net_device_stats *stats = dev->get_stats(dev);
2439 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2440 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2441 dev->name, stats->rx_bytes, stats->rx_packets,
2443 stats->rx_dropped + stats->rx_missed_errors,
2444 stats->rx_fifo_errors,
2445 stats->rx_length_errors + stats->rx_over_errors +
2446 stats->rx_crc_errors + stats->rx_frame_errors,
2447 stats->rx_compressed, stats->multicast,
2448 stats->tx_bytes, stats->tx_packets,
2449 stats->tx_errors, stats->tx_dropped,
2450 stats->tx_fifo_errors, stats->collisions,
2451 stats->tx_carrier_errors +
2452 stats->tx_aborted_errors +
2453 stats->tx_window_errors +
2454 stats->tx_heartbeat_errors,
2455 stats->tx_compressed);
2459 * Called from the PROCfs module. This now uses the new arbitrary sized
2460 * /proc/net interface to create /proc/net/dev
2462 static int dev_seq_show(struct seq_file *seq, void *v)
2464 if (v == SEQ_START_TOKEN)
2465 seq_puts(seq, "Inter-| Receive "
2467 " face |bytes packets errs drop fifo frame "
2468 "compressed multicast|bytes packets errs "
2469 "drop fifo colls carrier compressed\n");
2471 dev_seq_printf_stats(seq, v);
2475 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2477 struct netif_rx_stats *rc = NULL;
2479 while (*pos < nr_cpu_ids)
2480 if (cpu_online(*pos)) {
2481 rc = &per_cpu(netdev_rx_stat, *pos);
2488 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2490 return softnet_get_online(pos);
2493 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2496 return softnet_get_online(pos);
2499 static void softnet_seq_stop(struct seq_file *seq, void *v)
2503 static int softnet_seq_show(struct seq_file *seq, void *v)
2505 struct netif_rx_stats *s = v;
2507 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2508 s->total, s->dropped, s->time_squeeze, 0,
2509 0, 0, 0, 0, /* was fastroute */
2514 static const struct seq_operations dev_seq_ops = {
2515 .start = dev_seq_start,
2516 .next = dev_seq_next,
2517 .stop = dev_seq_stop,
2518 .show = dev_seq_show,
2521 static int dev_seq_open(struct inode *inode, struct file *file)
2523 return seq_open_net(inode, file, &dev_seq_ops,
2524 sizeof(struct seq_net_private));
2527 static const struct file_operations dev_seq_fops = {
2528 .owner = THIS_MODULE,
2529 .open = dev_seq_open,
2531 .llseek = seq_lseek,
2532 .release = seq_release_net,
2535 static const struct seq_operations softnet_seq_ops = {
2536 .start = softnet_seq_start,
2537 .next = softnet_seq_next,
2538 .stop = softnet_seq_stop,
2539 .show = softnet_seq_show,
2542 static int softnet_seq_open(struct inode *inode, struct file *file)
2544 return seq_open(file, &softnet_seq_ops);
2547 static const struct file_operations softnet_seq_fops = {
2548 .owner = THIS_MODULE,
2549 .open = softnet_seq_open,
2551 .llseek = seq_lseek,
2552 .release = seq_release,
2555 static void *ptype_get_idx(loff_t pos)
2557 struct packet_type *pt = NULL;
2561 list_for_each_entry_rcu(pt, &ptype_all, list) {
2567 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
2568 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
2577 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
2581 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
2584 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2586 struct packet_type *pt;
2587 struct list_head *nxt;
2591 if (v == SEQ_START_TOKEN)
2592 return ptype_get_idx(0);
2595 nxt = pt->list.next;
2596 if (pt->type == htons(ETH_P_ALL)) {
2597 if (nxt != &ptype_all)
2600 nxt = ptype_base[0].next;
2602 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
2604 while (nxt == &ptype_base[hash]) {
2605 if (++hash >= PTYPE_HASH_SIZE)
2607 nxt = ptype_base[hash].next;
2610 return list_entry(nxt, struct packet_type, list);
2613 static void ptype_seq_stop(struct seq_file *seq, void *v)
2619 static void ptype_seq_decode(struct seq_file *seq, void *sym)
2621 #ifdef CONFIG_KALLSYMS
2622 unsigned long offset = 0, symsize;
2623 const char *symname;
2627 symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
2634 modname = delim = "";
2635 seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
2641 seq_printf(seq, "[%p]", sym);
2644 static int ptype_seq_show(struct seq_file *seq, void *v)
2646 struct packet_type *pt = v;
2648 if (v == SEQ_START_TOKEN)
2649 seq_puts(seq, "Type Device Function\n");
2650 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
2651 if (pt->type == htons(ETH_P_ALL))
2652 seq_puts(seq, "ALL ");
2654 seq_printf(seq, "%04x", ntohs(pt->type));
2656 seq_printf(seq, " %-8s ",
2657 pt->dev ? pt->dev->name : "");
2658 ptype_seq_decode(seq, pt->func);
2659 seq_putc(seq, '\n');
2665 static const struct seq_operations ptype_seq_ops = {
2666 .start = ptype_seq_start,
2667 .next = ptype_seq_next,
2668 .stop = ptype_seq_stop,
2669 .show = ptype_seq_show,
2672 static int ptype_seq_open(struct inode *inode, struct file *file)
2674 return seq_open_net(inode, file, &ptype_seq_ops,
2675 sizeof(struct seq_net_private));
2678 static const struct file_operations ptype_seq_fops = {
2679 .owner = THIS_MODULE,
2680 .open = ptype_seq_open,
2682 .llseek = seq_lseek,
2683 .release = seq_release_net,
2687 static int __net_init dev_proc_net_init(struct net *net)
2691 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
2693 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
2695 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
2698 if (wext_proc_init(net))
2704 proc_net_remove(net, "ptype");
2706 proc_net_remove(net, "softnet_stat");
2708 proc_net_remove(net, "dev");
2712 static void __net_exit dev_proc_net_exit(struct net *net)
2714 wext_proc_exit(net);
2716 proc_net_remove(net, "ptype");
2717 proc_net_remove(net, "softnet_stat");
2718 proc_net_remove(net, "dev");
2721 static struct pernet_operations __net_initdata dev_proc_ops = {
2722 .init = dev_proc_net_init,
2723 .exit = dev_proc_net_exit,
2726 static int __init dev_proc_init(void)
2728 return register_pernet_subsys(&dev_proc_ops);
2731 #define dev_proc_init() 0
2732 #endif /* CONFIG_PROC_FS */
2736 * netdev_set_master - set up master/slave pair
2737 * @slave: slave device
2738 * @master: new master device
2740 * Changes the master device of the slave. Pass %NULL to break the
2741 * bonding. The caller must hold the RTNL semaphore. On a failure
2742 * a negative errno code is returned. On success the reference counts
2743 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2744 * function returns zero.
2746 int netdev_set_master(struct net_device *slave, struct net_device *master)
2748 struct net_device *old = slave->master;
2758 slave->master = master;
2766 slave->flags |= IFF_SLAVE;
2768 slave->flags &= ~IFF_SLAVE;
2770 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2774 static int __dev_set_promiscuity(struct net_device *dev, int inc)
2776 unsigned short old_flags = dev->flags;
2780 dev->flags |= IFF_PROMISC;
2781 dev->promiscuity += inc;
2782 if (dev->promiscuity == 0) {
2785 * If inc causes overflow, untouch promisc and return error.
2788 dev->flags &= ~IFF_PROMISC;
2790 dev->promiscuity -= inc;
2791 printk(KERN_WARNING "%s: promiscuity touches roof, "
2792 "set promiscuity failed, promiscuity feature "
2793 "of device might be broken.\n", dev->name);
2797 if (dev->flags != old_flags) {
2798 printk(KERN_INFO "device %s %s promiscuous mode\n",
2799 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2802 audit_log(current->audit_context, GFP_ATOMIC,
2803 AUDIT_ANOM_PROMISCUOUS,
2804 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
2805 dev->name, (dev->flags & IFF_PROMISC),
2806 (old_flags & IFF_PROMISC),
2807 audit_get_loginuid(current),
2808 current->uid, current->gid,
2809 audit_get_sessionid(current));
2811 if (dev->change_rx_flags)
2812 dev->change_rx_flags(dev, IFF_PROMISC);
2818 * dev_set_promiscuity - update promiscuity count on a device
2822 * Add or remove promiscuity from a device. While the count in the device
2823 * remains above zero the interface remains promiscuous. Once it hits zero
2824 * the device reverts back to normal filtering operation. A negative inc
2825 * value is used to drop promiscuity on the device.
2826 * Return 0 if successful or a negative errno code on error.
2828 int dev_set_promiscuity(struct net_device *dev, int inc)
2830 unsigned short old_flags = dev->flags;
2833 err = __dev_set_promiscuity(dev, inc);
2836 if (dev->flags != old_flags)
2837 dev_set_rx_mode(dev);
2842 * dev_set_allmulti - update allmulti count on a device
2846 * Add or remove reception of all multicast frames to a device. While the
2847 * count in the device remains above zero the interface remains listening
2848 * to all interfaces. Once it hits zero the device reverts back to normal
2849 * filtering operation. A negative @inc value is used to drop the counter
2850 * when releasing a resource needing all multicasts.
2851 * Return 0 if successful or a negative errno code on error.
2854 int dev_set_allmulti(struct net_device *dev, int inc)
2856 unsigned short old_flags = dev->flags;
2860 dev->flags |= IFF_ALLMULTI;
2861 dev->allmulti += inc;
2862 if (dev->allmulti == 0) {
2865 * If inc causes overflow, untouch allmulti and return error.
2868 dev->flags &= ~IFF_ALLMULTI;
2870 dev->allmulti -= inc;
2871 printk(KERN_WARNING "%s: allmulti touches roof, "
2872 "set allmulti failed, allmulti feature of "
2873 "device might be broken.\n", dev->name);
2877 if (dev->flags ^ old_flags) {
2878 if (dev->change_rx_flags)
2879 dev->change_rx_flags(dev, IFF_ALLMULTI);
2880 dev_set_rx_mode(dev);
2886 * Upload unicast and multicast address lists to device and
2887 * configure RX filtering. When the device doesn't support unicast
2888 * filtering it is put in promiscuous mode while unicast addresses
2891 void __dev_set_rx_mode(struct net_device *dev)
2893 /* dev_open will call this function so the list will stay sane. */
2894 if (!(dev->flags&IFF_UP))
2897 if (!netif_device_present(dev))
2900 if (dev->set_rx_mode)
2901 dev->set_rx_mode(dev);
2903 /* Unicast addresses changes may only happen under the rtnl,
2904 * therefore calling __dev_set_promiscuity here is safe.
2906 if (dev->uc_count > 0 && !dev->uc_promisc) {
2907 __dev_set_promiscuity(dev, 1);
2908 dev->uc_promisc = 1;
2909 } else if (dev->uc_count == 0 && dev->uc_promisc) {
2910 __dev_set_promiscuity(dev, -1);
2911 dev->uc_promisc = 0;
2914 if (dev->set_multicast_list)
2915 dev->set_multicast_list(dev);
2919 void dev_set_rx_mode(struct net_device *dev)
2921 netif_tx_lock_bh(dev);
2922 __dev_set_rx_mode(dev);
2923 netif_tx_unlock_bh(dev);
2926 int __dev_addr_delete(struct dev_addr_list **list, int *count,
2927 void *addr, int alen, int glbl)
2929 struct dev_addr_list *da;
2931 for (; (da = *list) != NULL; list = &da->next) {
2932 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
2933 alen == da->da_addrlen) {
2935 int old_glbl = da->da_gusers;
2952 int __dev_addr_add(struct dev_addr_list **list, int *count,
2953 void *addr, int alen, int glbl)
2955 struct dev_addr_list *da;
2957 for (da = *list; da != NULL; da = da->next) {
2958 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
2959 da->da_addrlen == alen) {
2961 int old_glbl = da->da_gusers;
2971 da = kzalloc(sizeof(*da), GFP_ATOMIC);
2974 memcpy(da->da_addr, addr, alen);
2975 da->da_addrlen = alen;
2977 da->da_gusers = glbl ? 1 : 0;
2985 * dev_unicast_delete - Release secondary unicast address.
2987 * @addr: address to delete
2988 * @alen: length of @addr
2990 * Release reference to a secondary unicast address and remove it
2991 * from the device if the reference count drops to zero.
2993 * The caller must hold the rtnl_mutex.
2995 int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
3001 netif_tx_lock_bh(dev);
3002 err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3004 __dev_set_rx_mode(dev);
3005 netif_tx_unlock_bh(dev);
3008 EXPORT_SYMBOL(dev_unicast_delete);
3011 * dev_unicast_add - add a secondary unicast address
3013 * @addr: address to delete
3014 * @alen: length of @addr
3016 * Add a secondary unicast address to the device or increase
3017 * the reference count if it already exists.
3019 * The caller must hold the rtnl_mutex.
3021 int dev_unicast_add(struct net_device *dev, void *addr, int alen)
3027 netif_tx_lock_bh(dev);
3028 err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3030 __dev_set_rx_mode(dev);
3031 netif_tx_unlock_bh(dev);
3034 EXPORT_SYMBOL(dev_unicast_add);
3036 int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
3037 struct dev_addr_list **from, int *from_count)
3039 struct dev_addr_list *da, *next;
3043 while (da != NULL) {
3045 if (!da->da_synced) {
3046 err = __dev_addr_add(to, to_count,
3047 da->da_addr, da->da_addrlen, 0);
3052 } else if (da->da_users == 1) {
3053 __dev_addr_delete(to, to_count,
3054 da->da_addr, da->da_addrlen, 0);
3055 __dev_addr_delete(from, from_count,
3056 da->da_addr, da->da_addrlen, 0);
3063 void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
3064 struct dev_addr_list **from, int *from_count)
3066 struct dev_addr_list *da, *next;
3069 while (da != NULL) {
3071 if (da->da_synced) {
3072 __dev_addr_delete(to, to_count,
3073 da->da_addr, da->da_addrlen, 0);
3075 __dev_addr_delete(from, from_count,
3076 da->da_addr, da->da_addrlen, 0);
3083 * dev_unicast_sync - Synchronize device's unicast list to another device
3084 * @to: destination device
3085 * @from: source device
3087 * Add newly added addresses to the destination device and release
3088 * addresses that have no users left. The source device must be
3089 * locked by netif_tx_lock_bh.
3091 * This function is intended to be called from the dev->set_rx_mode
3092 * function of layered software devices.
3094 int dev_unicast_sync(struct net_device *to, struct net_device *from)
3098 netif_tx_lock_bh(to);
3099 err = __dev_addr_sync(&to->uc_list, &to->uc_count,
3100 &from->uc_list, &from->uc_count);
3102 __dev_set_rx_mode(to);
3103 netif_tx_unlock_bh(to);
3106 EXPORT_SYMBOL(dev_unicast_sync);
3109 * dev_unicast_unsync - Remove synchronized addresses from the destination device
3110 * @to: destination device
3111 * @from: source device
3113 * Remove all addresses that were added to the destination device by
3114 * dev_unicast_sync(). This function is intended to be called from the
3115 * dev->stop function of layered software devices.
3117 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
3119 netif_tx_lock_bh(from);
3120 netif_tx_lock_bh(to);
3122 __dev_addr_unsync(&to->uc_list, &to->uc_count,
3123 &from->uc_list, &from->uc_count);
3124 __dev_set_rx_mode(to);
3126 netif_tx_unlock_bh(to);
3127 netif_tx_unlock_bh(from);
3129 EXPORT_SYMBOL(dev_unicast_unsync);
3131 static void __dev_addr_discard(struct dev_addr_list **list)
3133 struct dev_addr_list *tmp;
3135 while (*list != NULL) {
3138 if (tmp->da_users > tmp->da_gusers)
3139 printk("__dev_addr_discard: address leakage! "
3140 "da_users=%d\n", tmp->da_users);
3145 static void dev_addr_discard(struct net_device *dev)
3147 netif_tx_lock_bh(dev);
3149 __dev_addr_discard(&dev->uc_list);
3152 __dev_addr_discard(&dev->mc_list);
3155 netif_tx_unlock_bh(dev);
3158 unsigned dev_get_flags(const struct net_device *dev)
3162 flags = (dev->flags & ~(IFF_PROMISC |
3167 (dev->gflags & (IFF_PROMISC |
3170 if (netif_running(dev)) {
3171 if (netif_oper_up(dev))
3172 flags |= IFF_RUNNING;
3173 if (netif_carrier_ok(dev))
3174 flags |= IFF_LOWER_UP;
3175 if (netif_dormant(dev))
3176 flags |= IFF_DORMANT;
3182 int dev_change_flags(struct net_device *dev, unsigned flags)
3185 int old_flags = dev->flags;
3190 * Set the flags on our device.
3193 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
3194 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
3196 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
3200 * Load in the correct multicast list now the flags have changed.
3203 if (dev->change_rx_flags && (old_flags ^ flags) & IFF_MULTICAST)
3204 dev->change_rx_flags(dev, IFF_MULTICAST);
3206 dev_set_rx_mode(dev);
3209 * Have we downed the interface. We handle IFF_UP ourselves
3210 * according to user attempts to set it, rather than blindly
3215 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
3216 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
3219 dev_set_rx_mode(dev);
3222 if (dev->flags & IFF_UP &&
3223 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
3225 call_netdevice_notifiers(NETDEV_CHANGE, dev);
3227 if ((flags ^ dev->gflags) & IFF_PROMISC) {
3228 int inc = (flags & IFF_PROMISC) ? +1 : -1;
3229 dev->gflags ^= IFF_PROMISC;
3230 dev_set_promiscuity(dev, inc);
3233 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
3234 is important. Some (broken) drivers set IFF_PROMISC, when
3235 IFF_ALLMULTI is requested not asking us and not reporting.
3237 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
3238 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
3239 dev->gflags ^= IFF_ALLMULTI;
3240 dev_set_allmulti(dev, inc);
3243 /* Exclude state transition flags, already notified */
3244 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
3246 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
3251 int dev_set_mtu(struct net_device *dev, int new_mtu)
3255 if (new_mtu == dev->mtu)
3258 /* MTU must be positive. */
3262 if (!netif_device_present(dev))
3266 if (dev->change_mtu)
3267 err = dev->change_mtu(dev, new_mtu);
3270 if (!err && dev->flags & IFF_UP)
3271 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
3275 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
3279 if (!dev->set_mac_address)
3281 if (sa->sa_family != dev->type)
3283 if (!netif_device_present(dev))
3285 err = dev->set_mac_address(dev, sa);
3287 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3292 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
3294 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
3297 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3303 case SIOCGIFFLAGS: /* Get interface flags */
3304 ifr->ifr_flags = dev_get_flags(dev);
3307 case SIOCGIFMETRIC: /* Get the metric on the interface
3308 (currently unused) */
3309 ifr->ifr_metric = 0;
3312 case SIOCGIFMTU: /* Get the MTU of a device */
3313 ifr->ifr_mtu = dev->mtu;
3318 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
3320 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
3321 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3322 ifr->ifr_hwaddr.sa_family = dev->type;
3330 ifr->ifr_map.mem_start = dev->mem_start;
3331 ifr->ifr_map.mem_end = dev->mem_end;
3332 ifr->ifr_map.base_addr = dev->base_addr;
3333 ifr->ifr_map.irq = dev->irq;
3334 ifr->ifr_map.dma = dev->dma;
3335 ifr->ifr_map.port = dev->if_port;
3339 ifr->ifr_ifindex = dev->ifindex;
3343 ifr->ifr_qlen = dev->tx_queue_len;
3347 /* dev_ioctl() should ensure this case
3359 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
3361 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
3364 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3370 case SIOCSIFFLAGS: /* Set interface flags */
3371 return dev_change_flags(dev, ifr->ifr_flags);
3373 case SIOCSIFMETRIC: /* Set the metric on the interface
3374 (currently unused) */
3377 case SIOCSIFMTU: /* Set the MTU of a device */
3378 return dev_set_mtu(dev, ifr->ifr_mtu);
3381 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
3383 case SIOCSIFHWBROADCAST:
3384 if (ifr->ifr_hwaddr.sa_family != dev->type)
3386 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
3387 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3388 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3392 if (dev->set_config) {
3393 if (!netif_device_present(dev))
3395 return dev->set_config(dev, &ifr->ifr_map);
3400 if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
3401 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3403 if (!netif_device_present(dev))
3405 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
3409 if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
3410 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3412 if (!netif_device_present(dev))
3414 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
3418 if (ifr->ifr_qlen < 0)
3420 dev->tx_queue_len = ifr->ifr_qlen;
3424 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
3425 return dev_change_name(dev, ifr->ifr_newname);
3428 * Unknown or private ioctl
3432 if ((cmd >= SIOCDEVPRIVATE &&
3433 cmd <= SIOCDEVPRIVATE + 15) ||
3434 cmd == SIOCBONDENSLAVE ||
3435 cmd == SIOCBONDRELEASE ||
3436 cmd == SIOCBONDSETHWADDR ||
3437 cmd == SIOCBONDSLAVEINFOQUERY ||
3438 cmd == SIOCBONDINFOQUERY ||
3439 cmd == SIOCBONDCHANGEACTIVE ||
3440 cmd == SIOCGMIIPHY ||
3441 cmd == SIOCGMIIREG ||
3442 cmd == SIOCSMIIREG ||
3443 cmd == SIOCBRADDIF ||
3444 cmd == SIOCBRDELIF ||
3445 cmd == SIOCWANDEV) {
3447 if (dev->do_ioctl) {
3448 if (netif_device_present(dev))
3449 err = dev->do_ioctl(dev, ifr,
3462 * This function handles all "interface"-type I/O control requests. The actual
3463 * 'doing' part of this is dev_ifsioc above.
3467 * dev_ioctl - network device ioctl
3468 * @net: the applicable net namespace
3469 * @cmd: command to issue
3470 * @arg: pointer to a struct ifreq in user space
3472 * Issue ioctl functions to devices. This is normally called by the
3473 * user space syscall interfaces but can sometimes be useful for
3474 * other purposes. The return value is the return from the syscall if
3475 * positive or a negative errno code on error.
3478 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
3484 /* One special case: SIOCGIFCONF takes ifconf argument
3485 and requires shared lock, because it sleeps writing
3489 if (cmd == SIOCGIFCONF) {
3491 ret = dev_ifconf(net, (char __user *) arg);
3495 if (cmd == SIOCGIFNAME)
3496 return dev_ifname(net, (struct ifreq __user *)arg);
3498 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3501 ifr.ifr_name[IFNAMSIZ-1] = 0;
3503 colon = strchr(ifr.ifr_name, ':');
3508 * See which interface the caller is talking about.
3513 * These ioctl calls:
3514 * - can be done by all.
3515 * - atomic and do not require locking.
3526 dev_load(net, ifr.ifr_name);
3527 read_lock(&dev_base_lock);
3528 ret = dev_ifsioc_locked(net, &ifr, cmd);
3529 read_unlock(&dev_base_lock);
3533 if (copy_to_user(arg, &ifr,
3534 sizeof(struct ifreq)))
3540 dev_load(net, ifr.ifr_name);
3542 ret = dev_ethtool(net, &ifr);
3547 if (copy_to_user(arg, &ifr,
3548 sizeof(struct ifreq)))
3554 * These ioctl calls:
3555 * - require superuser power.
3556 * - require strict serialization.
3562 if (!capable(CAP_NET_ADMIN))
3564 dev_load(net, ifr.ifr_name);
3566 ret = dev_ifsioc(net, &ifr, cmd);
3571 if (copy_to_user(arg, &ifr,
3572 sizeof(struct ifreq)))
3578 * These ioctl calls:
3579 * - require superuser power.
3580 * - require strict serialization.
3581 * - do not return a value
3591 case SIOCSIFHWBROADCAST:
3594 case SIOCBONDENSLAVE:
3595 case SIOCBONDRELEASE:
3596 case SIOCBONDSETHWADDR:
3597 case SIOCBONDCHANGEACTIVE:
3600 if (!capable(CAP_NET_ADMIN))
3603 case SIOCBONDSLAVEINFOQUERY:
3604 case SIOCBONDINFOQUERY:
3605 dev_load(net, ifr.ifr_name);
3607 ret = dev_ifsioc(net, &ifr, cmd);
3612 /* Get the per device memory space. We can add this but
3613 * currently do not support it */
3615 /* Set the per device memory buffer space.
3616 * Not applicable in our case */
3621 * Unknown or private ioctl.
3624 if (cmd == SIOCWANDEV ||
3625 (cmd >= SIOCDEVPRIVATE &&
3626 cmd <= SIOCDEVPRIVATE + 15)) {
3627 dev_load(net, ifr.ifr_name);
3629 ret = dev_ifsioc(net, &ifr, cmd);
3631 if (!ret && copy_to_user(arg, &ifr,
3632 sizeof(struct ifreq)))
3636 /* Take care of Wireless Extensions */
3637 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
3638 return wext_handle_ioctl(net, &ifr, cmd, arg);
3645 * dev_new_index - allocate an ifindex
3646 * @net: the applicable net namespace
3648 * Returns a suitable unique value for a new device interface
3649 * number. The caller must hold the rtnl semaphore or the
3650 * dev_base_lock to be sure it remains unique.
3652 static int dev_new_index(struct net *net)
3658 if (!__dev_get_by_index(net, ifindex))
3663 /* Delayed registration/unregisteration */
3664 static DEFINE_SPINLOCK(net_todo_list_lock);
3665 static LIST_HEAD(net_todo_list);
3667 static void net_set_todo(struct net_device *dev)
3669 spin_lock(&net_todo_list_lock);
3670 list_add_tail(&dev->todo_list, &net_todo_list);
3671 spin_unlock(&net_todo_list_lock);
3674 static void rollback_registered(struct net_device *dev)
3676 BUG_ON(dev_boot_phase);
3679 /* Some devices call without registering for initialization unwind. */
3680 if (dev->reg_state == NETREG_UNINITIALIZED) {
3681 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3682 "was registered\n", dev->name, dev);
3688 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3690 /* If device is running, close it first. */
3693 /* And unlink it from device chain. */
3694 unlist_netdevice(dev);
3696 dev->reg_state = NETREG_UNREGISTERING;
3700 /* Shutdown queueing discipline. */
3704 /* Notify protocols, that we are about to destroy
3705 this device. They should clean all the things.
3707 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
3710 * Flush the unicast and multicast chains
3712 dev_addr_discard(dev);
3717 /* Notifier chain MUST detach us from master device. */
3718 BUG_TRAP(!dev->master);
3720 /* Remove entries from kobject tree */
3721 netdev_unregister_kobject(dev);
3729 * register_netdevice - register a network device
3730 * @dev: device to register
3732 * Take a completed network device structure and add it to the kernel
3733 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3734 * chain. 0 is returned on success. A negative errno code is returned
3735 * on a failure to set up the device, or if the name is a duplicate.
3737 * Callers must hold the rtnl semaphore. You may want
3738 * register_netdev() instead of this.
3741 * The locking appears insufficient to guarantee two parallel registers
3742 * will not get the same name.
3745 int register_netdevice(struct net_device *dev)
3747 struct hlist_head *head;
3748 struct hlist_node *p;
3752 BUG_ON(dev_boot_phase);
3757 /* When net_device's are persistent, this will be fatal. */
3758 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
3759 BUG_ON(!dev_net(dev));
3762 spin_lock_init(&dev->queue_lock);
3763 spin_lock_init(&dev->_xmit_lock);
3764 netdev_set_lockdep_class(&dev->_xmit_lock, dev->type);
3765 dev->xmit_lock_owner = -1;
3766 spin_lock_init(&dev->ingress_lock);
3770 /* Init, if this function is available */
3772 ret = dev->init(dev);
3780 if (!dev_valid_name(dev->name)) {
3785 dev->ifindex = dev_new_index(net);
3786 if (dev->iflink == -1)
3787 dev->iflink = dev->ifindex;
3789 /* Check for existence of name */
3790 head = dev_name_hash(net, dev->name);
3791 hlist_for_each(p, head) {
3792 struct net_device *d
3793 = hlist_entry(p, struct net_device, name_hlist);
3794 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
3800 /* Fix illegal checksum combinations */
3801 if ((dev->features & NETIF_F_HW_CSUM) &&
3802 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3803 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
3805 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
3808 if ((dev->features & NETIF_F_NO_CSUM) &&
3809 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3810 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
3812 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
3816 /* Fix illegal SG+CSUM combinations. */
3817 if ((dev->features & NETIF_F_SG) &&
3818 !(dev->features & NETIF_F_ALL_CSUM)) {
3819 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
3821 dev->features &= ~NETIF_F_SG;
3824 /* TSO requires that SG is present as well. */
3825 if ((dev->features & NETIF_F_TSO) &&
3826 !(dev->features & NETIF_F_SG)) {
3827 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
3829 dev->features &= ~NETIF_F_TSO;
3831 if (dev->features & NETIF_F_UFO) {
3832 if (!(dev->features & NETIF_F_HW_CSUM)) {
3833 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3834 "NETIF_F_HW_CSUM feature.\n",
3836 dev->features &= ~NETIF_F_UFO;
3838 if (!(dev->features & NETIF_F_SG)) {
3839 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3840 "NETIF_F_SG feature.\n",
3842 dev->features &= ~NETIF_F_UFO;
3846 netdev_initialize_kobject(dev);
3847 ret = netdev_register_kobject(dev);
3850 dev->reg_state = NETREG_REGISTERED;
3853 * Default initial state at registry is that the
3854 * device is present.
3857 set_bit(__LINK_STATE_PRESENT, &dev->state);
3859 dev_init_scheduler(dev);
3861 list_netdevice(dev);
3863 /* Notify protocols, that a new device appeared. */
3864 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
3865 ret = notifier_to_errno(ret);
3867 rollback_registered(dev);
3868 dev->reg_state = NETREG_UNREGISTERED;
3881 * register_netdev - register a network device
3882 * @dev: device to register
3884 * Take a completed network device structure and add it to the kernel
3885 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3886 * chain. 0 is returned on success. A negative errno code is returned
3887 * on a failure to set up the device, or if the name is a duplicate.
3889 * This is a wrapper around register_netdevice that takes the rtnl semaphore
3890 * and expands the device name if you passed a format string to
3893 int register_netdev(struct net_device *dev)
3900 * If the name is a format string the caller wants us to do a
3903 if (strchr(dev->name, '%')) {
3904 err = dev_alloc_name(dev, dev->name);
3909 err = register_netdevice(dev);
3914 EXPORT_SYMBOL(register_netdev);
3917 * netdev_wait_allrefs - wait until all references are gone.
3919 * This is called when unregistering network devices.
3921 * Any protocol or device that holds a reference should register
3922 * for netdevice notification, and cleanup and put back the
3923 * reference if they receive an UNREGISTER event.
3924 * We can get stuck here if buggy protocols don't correctly
3927 static void netdev_wait_allrefs(struct net_device *dev)
3929 unsigned long rebroadcast_time, warning_time;
3931 rebroadcast_time = warning_time = jiffies;
3932 while (atomic_read(&dev->refcnt) != 0) {
3933 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
3936 /* Rebroadcast unregister notification */
3937 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
3939 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
3941 /* We must not have linkwatch events
3942 * pending on unregister. If this
3943 * happens, we simply run the queue
3944 * unscheduled, resulting in a noop
3947 linkwatch_run_queue();
3952 rebroadcast_time = jiffies;
3957 if (time_after(jiffies, warning_time + 10 * HZ)) {
3958 printk(KERN_EMERG "unregister_netdevice: "
3959 "waiting for %s to become free. Usage "
3961 dev->name, atomic_read(&dev->refcnt));
3962 warning_time = jiffies;
3971 * register_netdevice(x1);
3972 * register_netdevice(x2);
3974 * unregister_netdevice(y1);
3975 * unregister_netdevice(y2);
3981 * We are invoked by rtnl_unlock() after it drops the semaphore.
3982 * This allows us to deal with problems:
3983 * 1) We can delete sysfs objects which invoke hotplug
3984 * without deadlocking with linkwatch via keventd.
3985 * 2) Since we run with the RTNL semaphore not held, we can sleep
3986 * safely in order to wait for the netdev refcnt to drop to zero.
3988 static DEFINE_MUTEX(net_todo_run_mutex);
3989 void netdev_run_todo(void)
3991 struct list_head list;
3993 /* Need to guard against multiple cpu's getting out of order. */
3994 mutex_lock(&net_todo_run_mutex);
3996 /* Not safe to do outside the semaphore. We must not return
3997 * until all unregister events invoked by the local processor
3998 * have been completed (either by this todo run, or one on
4001 if (list_empty(&net_todo_list))
4004 /* Snapshot list, allow later requests */
4005 spin_lock(&net_todo_list_lock);
4006 list_replace_init(&net_todo_list, &list);
4007 spin_unlock(&net_todo_list_lock);
4009 while (!list_empty(&list)) {
4010 struct net_device *dev
4011 = list_entry(list.next, struct net_device, todo_list);
4012 list_del(&dev->todo_list);
4014 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
4015 printk(KERN_ERR "network todo '%s' but state %d\n",
4016 dev->name, dev->reg_state);
4021 dev->reg_state = NETREG_UNREGISTERED;
4023 netdev_wait_allrefs(dev);
4026 BUG_ON(atomic_read(&dev->refcnt));
4027 BUG_TRAP(!dev->ip_ptr);
4028 BUG_TRAP(!dev->ip6_ptr);
4029 BUG_TRAP(!dev->dn_ptr);
4031 if (dev->destructor)
4032 dev->destructor(dev);
4034 /* Free network device */
4035 kobject_put(&dev->dev.kobj);
4039 mutex_unlock(&net_todo_run_mutex);
4042 static struct net_device_stats *internal_stats(struct net_device *dev)
4048 * alloc_netdev_mq - allocate network device
4049 * @sizeof_priv: size of private data to allocate space for
4050 * @name: device name format string
4051 * @setup: callback to initialize device
4052 * @queue_count: the number of subqueues to allocate
4054 * Allocates a struct net_device with private data area for driver use
4055 * and performs basic initialization. Also allocates subquue structs
4056 * for each queue on the device at the end of the netdevice.
4058 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
4059 void (*setup)(struct net_device *), unsigned int queue_count)
4062 struct net_device *dev;
4065 BUG_ON(strlen(name) >= sizeof(dev->name));
4067 alloc_size = sizeof(struct net_device) +
4068 sizeof(struct net_device_subqueue) * (queue_count - 1);
4070 /* ensure 32-byte alignment of private area */
4071 alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
4072 alloc_size += sizeof_priv;
4074 /* ensure 32-byte alignment of whole construct */
4075 alloc_size += NETDEV_ALIGN_CONST;
4077 p = kzalloc(alloc_size, GFP_KERNEL);
4079 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
4083 dev = (struct net_device *)
4084 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4085 dev->padded = (char *)dev - (char *)p;
4086 dev_net_set(dev, &init_net);
4089 dev->priv = ((char *)dev +
4090 ((sizeof(struct net_device) +
4091 (sizeof(struct net_device_subqueue) *
4092 (queue_count - 1)) + NETDEV_ALIGN_CONST)
4093 & ~NETDEV_ALIGN_CONST));
4096 dev->egress_subqueue_count = queue_count;
4097 dev->gso_max_size = GSO_MAX_SIZE;
4099 dev->get_stats = internal_stats;
4100 netpoll_netdev_init(dev);
4102 strcpy(dev->name, name);
4105 EXPORT_SYMBOL(alloc_netdev_mq);
4108 * free_netdev - free network device
4111 * This function does the last stage of destroying an allocated device
4112 * interface. The reference to the device object is released.
4113 * If this is the last reference then it will be freed.
4115 void free_netdev(struct net_device *dev)
4117 release_net(dev_net(dev));
4119 /* Compatibility with error handling in drivers */
4120 if (dev->reg_state == NETREG_UNINITIALIZED) {
4121 kfree((char *)dev - dev->padded);
4125 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
4126 dev->reg_state = NETREG_RELEASED;
4128 /* will free via device release */
4129 put_device(&dev->dev);
4132 /* Synchronize with packet receive processing. */
4133 void synchronize_net(void)
4140 * unregister_netdevice - remove device from the kernel
4143 * This function shuts down a device interface and removes it
4144 * from the kernel tables.
4146 * Callers must hold the rtnl semaphore. You may want
4147 * unregister_netdev() instead of this.
4150 void unregister_netdevice(struct net_device *dev)
4154 rollback_registered(dev);
4155 /* Finish processing unregister after unlock */
4160 * unregister_netdev - remove device from the kernel
4163 * This function shuts down a device interface and removes it
4164 * from the kernel tables.
4166 * This is just a wrapper for unregister_netdevice that takes
4167 * the rtnl semaphore. In general you want to use this and not
4168 * unregister_netdevice.
4170 void unregister_netdev(struct net_device *dev)
4173 unregister_netdevice(dev);
4177 EXPORT_SYMBOL(unregister_netdev);
4180 * dev_change_net_namespace - move device to different nethost namespace
4182 * @net: network namespace
4183 * @pat: If not NULL name pattern to try if the current device name
4184 * is already taken in the destination network namespace.
4186 * This function shuts down a device interface and moves it
4187 * to a new network namespace. On success 0 is returned, on
4188 * a failure a netagive errno code is returned.
4190 * Callers must hold the rtnl semaphore.
4193 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
4196 const char *destname;
4201 /* Don't allow namespace local devices to be moved. */
4203 if (dev->features & NETIF_F_NETNS_LOCAL)
4206 /* Ensure the device has been registrered */
4208 if (dev->reg_state != NETREG_REGISTERED)
4211 /* Get out if there is nothing todo */
4213 if (net_eq(dev_net(dev), net))
4216 /* Pick the destination device name, and ensure
4217 * we can use it in the destination network namespace.
4220 destname = dev->name;
4221 if (__dev_get_by_name(net, destname)) {
4222 /* We get here if we can't use the current device name */
4225 if (!dev_valid_name(pat))
4227 if (strchr(pat, '%')) {
4228 if (__dev_alloc_name(net, pat, buf) < 0)
4233 if (__dev_get_by_name(net, destname))
4238 * And now a mini version of register_netdevice unregister_netdevice.
4241 /* If device is running close it first. */
4244 /* And unlink it from device chain */
4246 unlist_netdevice(dev);
4250 /* Shutdown queueing discipline. */
4253 /* Notify protocols, that we are about to destroy
4254 this device. They should clean all the things.
4256 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4259 * Flush the unicast and multicast chains
4261 dev_addr_discard(dev);
4263 /* Actually switch the network namespace */
4264 dev_net_set(dev, net);
4266 /* Assign the new device name */
4267 if (destname != dev->name)
4268 strcpy(dev->name, destname);
4270 /* If there is an ifindex conflict assign a new one */
4271 if (__dev_get_by_index(net, dev->ifindex)) {
4272 int iflink = (dev->iflink == dev->ifindex);
4273 dev->ifindex = dev_new_index(net);
4275 dev->iflink = dev->ifindex;
4278 /* Fixup kobjects */
4279 netdev_unregister_kobject(dev);
4280 err = netdev_register_kobject(dev);
4283 /* Add the device back in the hashes */
4284 list_netdevice(dev);
4286 /* Notify protocols, that a new device appeared. */
4287 call_netdevice_notifiers(NETDEV_REGISTER, dev);
4295 static int dev_cpu_callback(struct notifier_block *nfb,
4296 unsigned long action,
4299 struct sk_buff **list_skb;
4300 struct net_device **list_net;
4301 struct sk_buff *skb;
4302 unsigned int cpu, oldcpu = (unsigned long)ocpu;
4303 struct softnet_data *sd, *oldsd;
4305 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
4308 local_irq_disable();
4309 cpu = smp_processor_id();
4310 sd = &per_cpu(softnet_data, cpu);
4311 oldsd = &per_cpu(softnet_data, oldcpu);
4313 /* Find end of our completion_queue. */
4314 list_skb = &sd->completion_queue;
4316 list_skb = &(*list_skb)->next;
4317 /* Append completion queue from offline CPU. */
4318 *list_skb = oldsd->completion_queue;
4319 oldsd->completion_queue = NULL;
4321 /* Find end of our output_queue. */
4322 list_net = &sd->output_queue;
4324 list_net = &(*list_net)->next_sched;
4325 /* Append output queue from offline CPU. */
4326 *list_net = oldsd->output_queue;
4327 oldsd->output_queue = NULL;
4329 raise_softirq_irqoff(NET_TX_SOFTIRQ);
4332 /* Process offline CPU's input_pkt_queue */
4333 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
4339 #ifdef CONFIG_NET_DMA
4341 * net_dma_rebalance - try to maintain one DMA channel per CPU
4342 * @net_dma: DMA client and associated data (lock, channels, channel_mask)
4344 * This is called when the number of channels allocated to the net_dma client
4345 * changes. The net_dma client tries to have one DMA channel per CPU.
4348 static void net_dma_rebalance(struct net_dma *net_dma)
4350 unsigned int cpu, i, n, chan_idx;
4351 struct dma_chan *chan;
4353 if (cpus_empty(net_dma->channel_mask)) {
4354 for_each_online_cpu(cpu)
4355 rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
4360 cpu = first_cpu(cpu_online_map);
4362 for_each_cpu_mask(chan_idx, net_dma->channel_mask) {
4363 chan = net_dma->channels[chan_idx];
4365 n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
4366 + (i < (num_online_cpus() %
4367 cpus_weight(net_dma->channel_mask)) ? 1 : 0));
4370 per_cpu(softnet_data, cpu).net_dma = chan;
4371 cpu = next_cpu(cpu, cpu_online_map);
4379 * netdev_dma_event - event callback for the net_dma_client
4380 * @client: should always be net_dma_client
4381 * @chan: DMA channel for the event
4382 * @state: DMA state to be handled
4384 static enum dma_state_client
4385 netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
4386 enum dma_state state)
4388 int i, found = 0, pos = -1;
4389 struct net_dma *net_dma =
4390 container_of(client, struct net_dma, client);
4391 enum dma_state_client ack = DMA_DUP; /* default: take no action */
4393 spin_lock(&net_dma->lock);
4395 case DMA_RESOURCE_AVAILABLE:
4396 for (i = 0; i < nr_cpu_ids; i++)
4397 if (net_dma->channels[i] == chan) {
4400 } else if (net_dma->channels[i] == NULL && pos < 0)
4403 if (!found && pos >= 0) {
4405 net_dma->channels[pos] = chan;
4406 cpu_set(pos, net_dma->channel_mask);
4407 net_dma_rebalance(net_dma);
4410 case DMA_RESOURCE_REMOVED:
4411 for (i = 0; i < nr_cpu_ids; i++)
4412 if (net_dma->channels[i] == chan) {
4420 cpu_clear(pos, net_dma->channel_mask);
4421 net_dma->channels[i] = NULL;
4422 net_dma_rebalance(net_dma);
4428 spin_unlock(&net_dma->lock);
4434 * netdev_dma_regiser - register the networking subsystem as a DMA client
4436 static int __init netdev_dma_register(void)
4438 net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma),
4440 if (unlikely(!net_dma.channels)) {
4442 "netdev_dma: no memory for net_dma.channels\n");
4445 spin_lock_init(&net_dma.lock);
4446 dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
4447 dma_async_client_register(&net_dma.client);
4448 dma_async_client_chan_request(&net_dma.client);
4453 static int __init netdev_dma_register(void) { return -ENODEV; }
4454 #endif /* CONFIG_NET_DMA */
4457 * netdev_compute_feature - compute conjunction of two feature sets
4458 * @all: first feature set
4459 * @one: second feature set
4461 * Computes a new feature set after adding a device with feature set
4462 * @one to the master device with current feature set @all. Returns
4463 * the new feature set.
4465 int netdev_compute_features(unsigned long all, unsigned long one)
4467 /* if device needs checksumming, downgrade to hw checksumming */
4468 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
4469 all ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
4471 /* if device can't do all checksum, downgrade to ipv4/ipv6 */
4472 if (all & NETIF_F_HW_CSUM && !(one & NETIF_F_HW_CSUM))
4473 all ^= NETIF_F_HW_CSUM
4474 | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
4476 if (one & NETIF_F_GSO)
4477 one |= NETIF_F_GSO_SOFTWARE;
4480 /* If even one device supports robust GSO, enable it for all. */
4481 if (one & NETIF_F_GSO_ROBUST)
4482 all |= NETIF_F_GSO_ROBUST;
4484 all &= one | NETIF_F_LLTX;
4486 if (!(all & NETIF_F_ALL_CSUM))
4488 if (!(all & NETIF_F_SG))
4489 all &= ~NETIF_F_GSO_MASK;
4493 EXPORT_SYMBOL(netdev_compute_features);
4495 static struct hlist_head *netdev_create_hash(void)
4498 struct hlist_head *hash;
4500 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
4502 for (i = 0; i < NETDEV_HASHENTRIES; i++)
4503 INIT_HLIST_HEAD(&hash[i]);
4508 /* Initialize per network namespace state */
4509 static int __net_init netdev_init(struct net *net)
4511 INIT_LIST_HEAD(&net->dev_base_head);
4513 net->dev_name_head = netdev_create_hash();
4514 if (net->dev_name_head == NULL)
4517 net->dev_index_head = netdev_create_hash();
4518 if (net->dev_index_head == NULL)
4524 kfree(net->dev_name_head);
4529 static void __net_exit netdev_exit(struct net *net)
4531 kfree(net->dev_name_head);
4532 kfree(net->dev_index_head);
4535 static struct pernet_operations __net_initdata netdev_net_ops = {
4536 .init = netdev_init,
4537 .exit = netdev_exit,
4540 static void __net_exit default_device_exit(struct net *net)
4542 struct net_device *dev, *next;
4544 * Push all migratable of the network devices back to the
4545 * initial network namespace
4548 for_each_netdev_safe(net, dev, next) {
4550 char fb_name[IFNAMSIZ];
4552 /* Ignore unmoveable devices (i.e. loopback) */
4553 if (dev->features & NETIF_F_NETNS_LOCAL)
4556 /* Push remaing network devices to init_net */
4557 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
4558 err = dev_change_net_namespace(dev, &init_net, fb_name);
4560 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
4561 __func__, dev->name, err);
4568 static struct pernet_operations __net_initdata default_device_ops = {
4569 .exit = default_device_exit,
4573 * Initialize the DEV module. At boot time this walks the device list and
4574 * unhooks any devices that fail to initialise (normally hardware not
4575 * present) and leaves us with a valid list of present and active devices.
4580 * This is called single threaded during boot, so no need
4581 * to take the rtnl semaphore.
4583 static int __init net_dev_init(void)
4585 int i, rc = -ENOMEM;
4587 BUG_ON(!dev_boot_phase);
4589 if (dev_proc_init())
4592 if (netdev_kobject_init())
4595 INIT_LIST_HEAD(&ptype_all);
4596 for (i = 0; i < PTYPE_HASH_SIZE; i++)
4597 INIT_LIST_HEAD(&ptype_base[i]);
4599 if (register_pernet_subsys(&netdev_net_ops))
4602 if (register_pernet_device(&default_device_ops))
4606 * Initialise the packet receive queues.
4609 for_each_possible_cpu(i) {
4610 struct softnet_data *queue;
4612 queue = &per_cpu(softnet_data, i);
4613 skb_queue_head_init(&queue->input_pkt_queue);
4614 queue->completion_queue = NULL;
4615 INIT_LIST_HEAD(&queue->poll_list);
4617 queue->backlog.poll = process_backlog;
4618 queue->backlog.weight = weight_p;
4621 netdev_dma_register();
4625 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
4626 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
4628 hotcpu_notifier(dev_cpu_callback, 0);
4636 subsys_initcall(net_dev_init);
4638 EXPORT_SYMBOL(__dev_get_by_index);
4639 EXPORT_SYMBOL(__dev_get_by_name);
4640 EXPORT_SYMBOL(__dev_remove_pack);
4641 EXPORT_SYMBOL(dev_valid_name);
4642 EXPORT_SYMBOL(dev_add_pack);
4643 EXPORT_SYMBOL(dev_alloc_name);
4644 EXPORT_SYMBOL(dev_close);
4645 EXPORT_SYMBOL(dev_get_by_flags);
4646 EXPORT_SYMBOL(dev_get_by_index);
4647 EXPORT_SYMBOL(dev_get_by_name);
4648 EXPORT_SYMBOL(dev_open);
4649 EXPORT_SYMBOL(dev_queue_xmit);
4650 EXPORT_SYMBOL(dev_remove_pack);
4651 EXPORT_SYMBOL(dev_set_allmulti);
4652 EXPORT_SYMBOL(dev_set_promiscuity);
4653 EXPORT_SYMBOL(dev_change_flags);
4654 EXPORT_SYMBOL(dev_set_mtu);
4655 EXPORT_SYMBOL(dev_set_mac_address);
4656 EXPORT_SYMBOL(free_netdev);
4657 EXPORT_SYMBOL(netdev_boot_setup_check);
4658 EXPORT_SYMBOL(netdev_set_master);
4659 EXPORT_SYMBOL(netdev_state_change);
4660 EXPORT_SYMBOL(netif_receive_skb);
4661 EXPORT_SYMBOL(netif_rx);
4662 EXPORT_SYMBOL(register_gifconf);
4663 EXPORT_SYMBOL(register_netdevice);
4664 EXPORT_SYMBOL(register_netdevice_notifier);
4665 EXPORT_SYMBOL(skb_checksum_help);
4666 EXPORT_SYMBOL(synchronize_net);
4667 EXPORT_SYMBOL(unregister_netdevice);
4668 EXPORT_SYMBOL(unregister_netdevice_notifier);
4669 EXPORT_SYMBOL(net_enable_timestamp);
4670 EXPORT_SYMBOL(net_disable_timestamp);
4671 EXPORT_SYMBOL(dev_get_flags);
4673 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
4674 EXPORT_SYMBOL(br_handle_frame_hook);
4675 EXPORT_SYMBOL(br_fdb_get_hook);
4676 EXPORT_SYMBOL(br_fdb_put_hook);
4680 EXPORT_SYMBOL(dev_load);
4683 EXPORT_PER_CPU_SYMBOL(softnet_data);