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 <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <net/net_namespace.h>
99 #include <linux/rtnetlink.h>
100 #include <linux/proc_fs.h>
101 #include <linux/seq_file.h>
102 #include <linux/stat.h>
104 #include <net/pkt_sched.h>
105 #include <net/checksum.h>
106 #include <net/xfrm.h>
107 #include <linux/highmem.h>
108 #include <linux/init.h>
109 #include <linux/kmod.h>
110 #include <linux/module.h>
111 #include <linux/netpoll.h>
112 #include <linux/rcupdate.h>
113 #include <linux/delay.h>
114 #include <net/wext.h>
115 #include <net/iw_handler.h>
116 #include <asm/current.h>
117 #include <linux/audit.h>
118 #include <linux/dmaengine.h>
119 #include <linux/err.h>
120 #include <linux/ctype.h>
121 #include <linux/if_arp.h>
122 #include <linux/if_vlan.h>
123 #include <linux/ip.h>
125 #include <linux/ipv6.h>
126 #include <linux/in.h>
127 #include <linux/jhash.h>
128 #include <linux/random.h>
129 #include <trace/events/napi.h>
130 #include <trace/events/net.h>
131 #include <trace/events/skb.h>
132 #include <linux/pci.h>
133 #include <linux/inetdevice.h>
134 #include <linux/cpu_rmap.h>
135 #include <linux/net_tstamp.h>
136 #include <linux/static_key.h>
137 #include <net/flow_keys.h>
139 #include "net-sysfs.h"
141 /* Instead of increasing this, you should create a hash table. */
142 #define MAX_GRO_SKBS 8
144 /* This should be increased if a protocol with a bigger head is added. */
145 #define GRO_MAX_HEAD (MAX_HEADER + 128)
148 * The list of packet types we will receive (as opposed to discard)
149 * and the routines to invoke.
151 * Why 16. Because with 16 the only overlap we get on a hash of the
152 * low nibble of the protocol value is RARP/SNAP/X.25.
154 * NOTE: That is no longer true with the addition of VLAN tags. Not
155 * sure which should go first, but I bet it won't make much
156 * difference if we are running VLANs. The good news is that
157 * this protocol won't be in the list unless compiled in, so
158 * the average user (w/out VLANs) will not be adversely affected.
175 #define PTYPE_HASH_SIZE (16)
176 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
178 static DEFINE_SPINLOCK(ptype_lock
);
179 static struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
180 static struct list_head ptype_all __read_mostly
; /* Taps */
183 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
186 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
188 * Writers must hold the rtnl semaphore while they loop through the
189 * dev_base_head list, and hold dev_base_lock for writing when they do the
190 * actual updates. This allows pure readers to access the list even
191 * while a writer is preparing to update it.
193 * To put it another way, dev_base_lock is held for writing only to
194 * protect against pure readers; the rtnl semaphore provides the
195 * protection against other writers.
197 * See, for example usages, register_netdevice() and
198 * unregister_netdevice(), which must be called with the rtnl
201 DEFINE_RWLOCK(dev_base_lock
);
202 EXPORT_SYMBOL(dev_base_lock
);
204 static inline void dev_base_seq_inc(struct net
*net
)
206 while (++net
->dev_base_seq
== 0);
209 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
211 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
213 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
216 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
218 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
221 static inline void rps_lock(struct softnet_data
*sd
)
224 spin_lock(&sd
->input_pkt_queue
.lock
);
228 static inline void rps_unlock(struct softnet_data
*sd
)
231 spin_unlock(&sd
->input_pkt_queue
.lock
);
235 /* Device list insertion */
236 static int list_netdevice(struct net_device
*dev
)
238 struct net
*net
= dev_net(dev
);
242 write_lock_bh(&dev_base_lock
);
243 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
244 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
245 hlist_add_head_rcu(&dev
->index_hlist
,
246 dev_index_hash(net
, dev
->ifindex
));
247 write_unlock_bh(&dev_base_lock
);
249 dev_base_seq_inc(net
);
254 /* Device list removal
255 * caller must respect a RCU grace period before freeing/reusing dev
257 static void unlist_netdevice(struct net_device
*dev
)
261 /* Unlink dev from the device chain */
262 write_lock_bh(&dev_base_lock
);
263 list_del_rcu(&dev
->dev_list
);
264 hlist_del_rcu(&dev
->name_hlist
);
265 hlist_del_rcu(&dev
->index_hlist
);
266 write_unlock_bh(&dev_base_lock
);
268 dev_base_seq_inc(dev_net(dev
));
275 static RAW_NOTIFIER_HEAD(netdev_chain
);
278 * Device drivers call our routines to queue packets here. We empty the
279 * queue in the local softnet handler.
282 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
283 EXPORT_PER_CPU_SYMBOL(softnet_data
);
285 #ifdef CONFIG_LOCKDEP
287 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
288 * according to dev->type
290 static const unsigned short netdev_lock_type
[] =
291 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
292 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
293 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
294 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
295 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
296 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
297 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
298 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
299 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
300 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
301 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
302 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
303 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
304 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
305 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
307 static const char *const netdev_lock_name
[] =
308 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
309 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
310 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
311 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
312 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
313 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
314 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
315 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
316 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
317 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
318 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
319 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
320 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
321 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
322 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
324 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
325 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
327 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
331 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
332 if (netdev_lock_type
[i
] == dev_type
)
334 /* the last key is used by default */
335 return ARRAY_SIZE(netdev_lock_type
) - 1;
338 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
339 unsigned short dev_type
)
343 i
= netdev_lock_pos(dev_type
);
344 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
345 netdev_lock_name
[i
]);
348 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
352 i
= netdev_lock_pos(dev
->type
);
353 lockdep_set_class_and_name(&dev
->addr_list_lock
,
354 &netdev_addr_lock_key
[i
],
355 netdev_lock_name
[i
]);
358 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
359 unsigned short dev_type
)
362 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
367 /*******************************************************************************
369 Protocol management and registration routines
371 *******************************************************************************/
374 * Add a protocol ID to the list. Now that the input handler is
375 * smarter we can dispense with all the messy stuff that used to be
378 * BEWARE!!! Protocol handlers, mangling input packets,
379 * MUST BE last in hash buckets and checking protocol handlers
380 * MUST start from promiscuous ptype_all chain in net_bh.
381 * It is true now, do not change it.
382 * Explanation follows: if protocol handler, mangling packet, will
383 * be the first on list, it is not able to sense, that packet
384 * is cloned and should be copied-on-write, so that it will
385 * change it and subsequent readers will get broken packet.
389 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
391 if (pt
->type
== htons(ETH_P_ALL
))
394 return &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
398 * dev_add_pack - add packet handler
399 * @pt: packet type declaration
401 * Add a protocol handler to the networking stack. The passed &packet_type
402 * is linked into kernel lists and may not be freed until it has been
403 * removed from the kernel lists.
405 * This call does not sleep therefore it can not
406 * guarantee all CPU's that are in middle of receiving packets
407 * will see the new packet type (until the next received packet).
410 void dev_add_pack(struct packet_type
*pt
)
412 struct list_head
*head
= ptype_head(pt
);
414 spin_lock(&ptype_lock
);
415 list_add_rcu(&pt
->list
, head
);
416 spin_unlock(&ptype_lock
);
418 EXPORT_SYMBOL(dev_add_pack
);
421 * __dev_remove_pack - remove packet handler
422 * @pt: packet type declaration
424 * Remove a protocol handler that was previously added to the kernel
425 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
426 * from the kernel lists and can be freed or reused once this function
429 * The packet type might still be in use by receivers
430 * and must not be freed until after all the CPU's have gone
431 * through a quiescent state.
433 void __dev_remove_pack(struct packet_type
*pt
)
435 struct list_head
*head
= ptype_head(pt
);
436 struct packet_type
*pt1
;
438 spin_lock(&ptype_lock
);
440 list_for_each_entry(pt1
, head
, list
) {
442 list_del_rcu(&pt
->list
);
447 pr_warn("dev_remove_pack: %p not found\n", pt
);
449 spin_unlock(&ptype_lock
);
451 EXPORT_SYMBOL(__dev_remove_pack
);
454 * dev_remove_pack - remove packet handler
455 * @pt: packet type declaration
457 * Remove a protocol handler that was previously added to the kernel
458 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
459 * from the kernel lists and can be freed or reused once this function
462 * This call sleeps to guarantee that no CPU is looking at the packet
465 void dev_remove_pack(struct packet_type
*pt
)
467 __dev_remove_pack(pt
);
471 EXPORT_SYMBOL(dev_remove_pack
);
473 /******************************************************************************
475 Device Boot-time Settings Routines
477 *******************************************************************************/
479 /* Boot time configuration table */
480 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
483 * netdev_boot_setup_add - add new setup entry
484 * @name: name of the device
485 * @map: configured settings for the device
487 * Adds new setup entry to the dev_boot_setup list. The function
488 * returns 0 on error and 1 on success. This is a generic routine to
491 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
493 struct netdev_boot_setup
*s
;
497 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
498 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
499 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
500 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
501 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
506 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
510 * netdev_boot_setup_check - check boot time settings
511 * @dev: the netdevice
513 * Check boot time settings for the device.
514 * The found settings are set for the device to be used
515 * later in the device probing.
516 * Returns 0 if no settings found, 1 if they are.
518 int netdev_boot_setup_check(struct net_device
*dev
)
520 struct netdev_boot_setup
*s
= dev_boot_setup
;
523 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
524 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
525 !strcmp(dev
->name
, s
[i
].name
)) {
526 dev
->irq
= s
[i
].map
.irq
;
527 dev
->base_addr
= s
[i
].map
.base_addr
;
528 dev
->mem_start
= s
[i
].map
.mem_start
;
529 dev
->mem_end
= s
[i
].map
.mem_end
;
535 EXPORT_SYMBOL(netdev_boot_setup_check
);
539 * netdev_boot_base - get address from boot time settings
540 * @prefix: prefix for network device
541 * @unit: id for network device
543 * Check boot time settings for the base address of device.
544 * The found settings are set for the device to be used
545 * later in the device probing.
546 * Returns 0 if no settings found.
548 unsigned long netdev_boot_base(const char *prefix
, int unit
)
550 const struct netdev_boot_setup
*s
= dev_boot_setup
;
554 sprintf(name
, "%s%d", prefix
, unit
);
557 * If device already registered then return base of 1
558 * to indicate not to probe for this interface
560 if (__dev_get_by_name(&init_net
, name
))
563 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
564 if (!strcmp(name
, s
[i
].name
))
565 return s
[i
].map
.base_addr
;
570 * Saves at boot time configured settings for any netdevice.
572 int __init
netdev_boot_setup(char *str
)
577 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
582 memset(&map
, 0, sizeof(map
));
586 map
.base_addr
= ints
[2];
588 map
.mem_start
= ints
[3];
590 map
.mem_end
= ints
[4];
592 /* Add new entry to the list */
593 return netdev_boot_setup_add(str
, &map
);
596 __setup("netdev=", netdev_boot_setup
);
598 /*******************************************************************************
600 Device Interface Subroutines
602 *******************************************************************************/
605 * __dev_get_by_name - find a device by its name
606 * @net: the applicable net namespace
607 * @name: name to find
609 * Find an interface by name. Must be called under RTNL semaphore
610 * or @dev_base_lock. If the name is found a pointer to the device
611 * is returned. If the name is not found then %NULL is returned. The
612 * reference counters are not incremented so the caller must be
613 * careful with locks.
616 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
618 struct hlist_node
*p
;
619 struct net_device
*dev
;
620 struct hlist_head
*head
= dev_name_hash(net
, name
);
622 hlist_for_each_entry(dev
, p
, head
, name_hlist
)
623 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
628 EXPORT_SYMBOL(__dev_get_by_name
);
631 * dev_get_by_name_rcu - find a device by its name
632 * @net: the applicable net namespace
633 * @name: name to find
635 * Find an interface by name.
636 * If the name is found a pointer to the device is returned.
637 * If the name is not found then %NULL is returned.
638 * The reference counters are not incremented so the caller must be
639 * careful with locks. The caller must hold RCU lock.
642 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
644 struct hlist_node
*p
;
645 struct net_device
*dev
;
646 struct hlist_head
*head
= dev_name_hash(net
, name
);
648 hlist_for_each_entry_rcu(dev
, p
, head
, name_hlist
)
649 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
654 EXPORT_SYMBOL(dev_get_by_name_rcu
);
657 * dev_get_by_name - find a device by its name
658 * @net: the applicable net namespace
659 * @name: name to find
661 * Find an interface by name. This can be called from any
662 * context and does its own locking. The returned handle has
663 * the usage count incremented and the caller must use dev_put() to
664 * release it when it is no longer needed. %NULL is returned if no
665 * matching device is found.
668 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
670 struct net_device
*dev
;
673 dev
= dev_get_by_name_rcu(net
, name
);
679 EXPORT_SYMBOL(dev_get_by_name
);
682 * __dev_get_by_index - find a device by its ifindex
683 * @net: the applicable net namespace
684 * @ifindex: index of device
686 * Search for an interface by index. Returns %NULL if the device
687 * is not found or a pointer to the device. The device has not
688 * had its reference counter increased so the caller must be careful
689 * about locking. The caller must hold either the RTNL semaphore
693 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
695 struct hlist_node
*p
;
696 struct net_device
*dev
;
697 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
699 hlist_for_each_entry(dev
, p
, head
, index_hlist
)
700 if (dev
->ifindex
== ifindex
)
705 EXPORT_SYMBOL(__dev_get_by_index
);
708 * dev_get_by_index_rcu - find a device by its ifindex
709 * @net: the applicable net namespace
710 * @ifindex: index of device
712 * Search for an interface by index. Returns %NULL if the device
713 * is not found or a pointer to the device. The device has not
714 * had its reference counter increased so the caller must be careful
715 * about locking. The caller must hold RCU lock.
718 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
720 struct hlist_node
*p
;
721 struct net_device
*dev
;
722 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
724 hlist_for_each_entry_rcu(dev
, p
, head
, index_hlist
)
725 if (dev
->ifindex
== ifindex
)
730 EXPORT_SYMBOL(dev_get_by_index_rcu
);
734 * dev_get_by_index - find a device by its ifindex
735 * @net: the applicable net namespace
736 * @ifindex: index of device
738 * Search for an interface by index. Returns NULL if the device
739 * is not found or a pointer to the device. The device returned has
740 * had a reference added and the pointer is safe until the user calls
741 * dev_put to indicate they have finished with it.
744 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
746 struct net_device
*dev
;
749 dev
= dev_get_by_index_rcu(net
, ifindex
);
755 EXPORT_SYMBOL(dev_get_by_index
);
758 * dev_getbyhwaddr_rcu - find a device by its hardware address
759 * @net: the applicable net namespace
760 * @type: media type of device
761 * @ha: hardware address
763 * Search for an interface by MAC address. Returns NULL if the device
764 * is not found or a pointer to the device.
765 * The caller must hold RCU or RTNL.
766 * The returned device has not had its ref count increased
767 * and the caller must therefore be careful about locking
771 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
774 struct net_device
*dev
;
776 for_each_netdev_rcu(net
, dev
)
777 if (dev
->type
== type
&&
778 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
783 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
785 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
787 struct net_device
*dev
;
790 for_each_netdev(net
, dev
)
791 if (dev
->type
== type
)
796 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
798 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
800 struct net_device
*dev
, *ret
= NULL
;
803 for_each_netdev_rcu(net
, dev
)
804 if (dev
->type
== type
) {
812 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
815 * dev_get_by_flags_rcu - find any device with given flags
816 * @net: the applicable net namespace
817 * @if_flags: IFF_* values
818 * @mask: bitmask of bits in if_flags to check
820 * Search for any interface with the given flags. Returns NULL if a device
821 * is not found or a pointer to the device. Must be called inside
822 * rcu_read_lock(), and result refcount is unchanged.
825 struct net_device
*dev_get_by_flags_rcu(struct net
*net
, unsigned short if_flags
,
828 struct net_device
*dev
, *ret
;
831 for_each_netdev_rcu(net
, dev
) {
832 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
839 EXPORT_SYMBOL(dev_get_by_flags_rcu
);
842 * dev_valid_name - check if name is okay for network device
845 * Network device names need to be valid file names to
846 * to allow sysfs to work. We also disallow any kind of
849 bool dev_valid_name(const char *name
)
853 if (strlen(name
) >= IFNAMSIZ
)
855 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
859 if (*name
== '/' || isspace(*name
))
865 EXPORT_SYMBOL(dev_valid_name
);
868 * __dev_alloc_name - allocate a name for a device
869 * @net: network namespace to allocate the device name in
870 * @name: name format string
871 * @buf: scratch buffer and result name string
873 * Passed a format string - eg "lt%d" it will try and find a suitable
874 * id. It scans list of devices to build up a free map, then chooses
875 * the first empty slot. The caller must hold the dev_base or rtnl lock
876 * while allocating the name and adding the device in order to avoid
878 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
879 * Returns the number of the unit assigned or a negative errno code.
882 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
886 const int max_netdevices
= 8*PAGE_SIZE
;
887 unsigned long *inuse
;
888 struct net_device
*d
;
890 p
= strnchr(name
, IFNAMSIZ
-1, '%');
893 * Verify the string as this thing may have come from
894 * the user. There must be either one "%d" and no other "%"
897 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
900 /* Use one page as a bit array of possible slots */
901 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
905 for_each_netdev(net
, d
) {
906 if (!sscanf(d
->name
, name
, &i
))
908 if (i
< 0 || i
>= max_netdevices
)
911 /* avoid cases where sscanf is not exact inverse of printf */
912 snprintf(buf
, IFNAMSIZ
, name
, i
);
913 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
917 i
= find_first_zero_bit(inuse
, max_netdevices
);
918 free_page((unsigned long) inuse
);
922 snprintf(buf
, IFNAMSIZ
, name
, i
);
923 if (!__dev_get_by_name(net
, buf
))
926 /* It is possible to run out of possible slots
927 * when the name is long and there isn't enough space left
928 * for the digits, or if all bits are used.
934 * dev_alloc_name - allocate a name for a device
936 * @name: name format string
938 * Passed a format string - eg "lt%d" it will try and find a suitable
939 * id. It scans list of devices to build up a free map, then chooses
940 * the first empty slot. The caller must hold the dev_base or rtnl lock
941 * while allocating the name and adding the device in order to avoid
943 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
944 * Returns the number of the unit assigned or a negative errno code.
947 int dev_alloc_name(struct net_device
*dev
, const char *name
)
953 BUG_ON(!dev_net(dev
));
955 ret
= __dev_alloc_name(net
, name
, buf
);
957 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
960 EXPORT_SYMBOL(dev_alloc_name
);
962 static int dev_get_valid_name(struct net_device
*dev
, const char *name
)
966 BUG_ON(!dev_net(dev
));
969 if (!dev_valid_name(name
))
972 if (strchr(name
, '%'))
973 return dev_alloc_name(dev
, name
);
974 else if (__dev_get_by_name(net
, name
))
976 else if (dev
->name
!= name
)
977 strlcpy(dev
->name
, name
, IFNAMSIZ
);
983 * dev_change_name - change name of a device
985 * @newname: name (or format string) must be at least IFNAMSIZ
987 * Change name of a device, can pass format strings "eth%d".
990 int dev_change_name(struct net_device
*dev
, const char *newname
)
992 char oldname
[IFNAMSIZ
];
998 BUG_ON(!dev_net(dev
));
1001 if (dev
->flags
& IFF_UP
)
1004 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0)
1007 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1009 err
= dev_get_valid_name(dev
, newname
);
1014 ret
= device_rename(&dev
->dev
, dev
->name
);
1016 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1020 write_lock_bh(&dev_base_lock
);
1021 hlist_del_rcu(&dev
->name_hlist
);
1022 write_unlock_bh(&dev_base_lock
);
1026 write_lock_bh(&dev_base_lock
);
1027 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1028 write_unlock_bh(&dev_base_lock
);
1030 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1031 ret
= notifier_to_errno(ret
);
1034 /* err >= 0 after dev_alloc_name() or stores the first errno */
1037 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1040 pr_err("%s: name change rollback failed: %d\n",
1049 * dev_set_alias - change ifalias of a device
1051 * @alias: name up to IFALIASZ
1052 * @len: limit of bytes to copy from info
1054 * Set ifalias for a device,
1056 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1062 if (len
>= IFALIASZ
)
1067 kfree(dev
->ifalias
);
1068 dev
->ifalias
= NULL
;
1073 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1076 dev
->ifalias
= new_ifalias
;
1078 strlcpy(dev
->ifalias
, alias
, len
+1);
1084 * netdev_features_change - device changes features
1085 * @dev: device to cause notification
1087 * Called to indicate a device has changed features.
1089 void netdev_features_change(struct net_device
*dev
)
1091 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1093 EXPORT_SYMBOL(netdev_features_change
);
1096 * netdev_state_change - device changes state
1097 * @dev: device to cause notification
1099 * Called to indicate a device has changed state. This function calls
1100 * the notifier chains for netdev_chain and sends a NEWLINK message
1101 * to the routing socket.
1103 void netdev_state_change(struct net_device
*dev
)
1105 if (dev
->flags
& IFF_UP
) {
1106 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
1107 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0);
1110 EXPORT_SYMBOL(netdev_state_change
);
1112 int netdev_bonding_change(struct net_device
*dev
, unsigned long event
)
1114 return call_netdevice_notifiers(event
, dev
);
1116 EXPORT_SYMBOL(netdev_bonding_change
);
1119 * dev_load - load a network module
1120 * @net: the applicable net namespace
1121 * @name: name of interface
1123 * If a network interface is not present and the process has suitable
1124 * privileges this function loads the module. If module loading is not
1125 * available in this kernel then it becomes a nop.
1128 void dev_load(struct net
*net
, const char *name
)
1130 struct net_device
*dev
;
1134 dev
= dev_get_by_name_rcu(net
, name
);
1138 if (no_module
&& capable(CAP_NET_ADMIN
))
1139 no_module
= request_module("netdev-%s", name
);
1140 if (no_module
&& capable(CAP_SYS_MODULE
)) {
1141 if (!request_module("%s", name
))
1142 pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
1146 EXPORT_SYMBOL(dev_load
);
1148 static int __dev_open(struct net_device
*dev
)
1150 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1155 if (!netif_device_present(dev
))
1158 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1159 ret
= notifier_to_errno(ret
);
1163 set_bit(__LINK_STATE_START
, &dev
->state
);
1165 if (ops
->ndo_validate_addr
)
1166 ret
= ops
->ndo_validate_addr(dev
);
1168 if (!ret
&& ops
->ndo_open
)
1169 ret
= ops
->ndo_open(dev
);
1172 clear_bit(__LINK_STATE_START
, &dev
->state
);
1174 dev
->flags
|= IFF_UP
;
1175 net_dmaengine_get();
1176 dev_set_rx_mode(dev
);
1178 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1185 * dev_open - prepare an interface for use.
1186 * @dev: device to open
1188 * Takes a device from down to up state. The device's private open
1189 * function is invoked and then the multicast lists are loaded. Finally
1190 * the device is moved into the up state and a %NETDEV_UP message is
1191 * sent to the netdev notifier chain.
1193 * Calling this function on an active interface is a nop. On a failure
1194 * a negative errno code is returned.
1196 int dev_open(struct net_device
*dev
)
1200 if (dev
->flags
& IFF_UP
)
1203 ret
= __dev_open(dev
);
1207 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1208 call_netdevice_notifiers(NETDEV_UP
, dev
);
1212 EXPORT_SYMBOL(dev_open
);
1214 static int __dev_close_many(struct list_head
*head
)
1216 struct net_device
*dev
;
1221 list_for_each_entry(dev
, head
, unreg_list
) {
1222 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1224 clear_bit(__LINK_STATE_START
, &dev
->state
);
1226 /* Synchronize to scheduled poll. We cannot touch poll list, it
1227 * can be even on different cpu. So just clear netif_running().
1229 * dev->stop() will invoke napi_disable() on all of it's
1230 * napi_struct instances on this device.
1232 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1235 dev_deactivate_many(head
);
1237 list_for_each_entry(dev
, head
, unreg_list
) {
1238 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1241 * Call the device specific close. This cannot fail.
1242 * Only if device is UP
1244 * We allow it to be called even after a DETACH hot-plug
1250 dev
->flags
&= ~IFF_UP
;
1251 net_dmaengine_put();
1257 static int __dev_close(struct net_device
*dev
)
1262 list_add(&dev
->unreg_list
, &single
);
1263 retval
= __dev_close_many(&single
);
1268 static int dev_close_many(struct list_head
*head
)
1270 struct net_device
*dev
, *tmp
;
1271 LIST_HEAD(tmp_list
);
1273 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
)
1274 if (!(dev
->flags
& IFF_UP
))
1275 list_move(&dev
->unreg_list
, &tmp_list
);
1277 __dev_close_many(head
);
1279 list_for_each_entry(dev
, head
, unreg_list
) {
1280 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1281 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1284 /* rollback_registered_many needs the complete original list */
1285 list_splice(&tmp_list
, head
);
1290 * dev_close - shutdown an interface.
1291 * @dev: device to shutdown
1293 * This function moves an active device into down state. A
1294 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1295 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1298 int dev_close(struct net_device
*dev
)
1300 if (dev
->flags
& IFF_UP
) {
1303 list_add(&dev
->unreg_list
, &single
);
1304 dev_close_many(&single
);
1309 EXPORT_SYMBOL(dev_close
);
1313 * dev_disable_lro - disable Large Receive Offload on a device
1316 * Disable Large Receive Offload (LRO) on a net device. Must be
1317 * called under RTNL. This is needed if received packets may be
1318 * forwarded to another interface.
1320 void dev_disable_lro(struct net_device
*dev
)
1323 * If we're trying to disable lro on a vlan device
1324 * use the underlying physical device instead
1326 if (is_vlan_dev(dev
))
1327 dev
= vlan_dev_real_dev(dev
);
1329 dev
->wanted_features
&= ~NETIF_F_LRO
;
1330 netdev_update_features(dev
);
1332 if (unlikely(dev
->features
& NETIF_F_LRO
))
1333 netdev_WARN(dev
, "failed to disable LRO!\n");
1335 EXPORT_SYMBOL(dev_disable_lro
);
1338 static int dev_boot_phase
= 1;
1341 * register_netdevice_notifier - register a network notifier block
1344 * Register a notifier to be called when network device events occur.
1345 * The notifier passed is linked into the kernel structures and must
1346 * not be reused until it has been unregistered. A negative errno code
1347 * is returned on a failure.
1349 * When registered all registration and up events are replayed
1350 * to the new notifier to allow device to have a race free
1351 * view of the network device list.
1354 int register_netdevice_notifier(struct notifier_block
*nb
)
1356 struct net_device
*dev
;
1357 struct net_device
*last
;
1362 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1368 for_each_netdev(net
, dev
) {
1369 err
= nb
->notifier_call(nb
, NETDEV_REGISTER
, dev
);
1370 err
= notifier_to_errno(err
);
1374 if (!(dev
->flags
& IFF_UP
))
1377 nb
->notifier_call(nb
, NETDEV_UP
, dev
);
1388 for_each_netdev(net
, dev
) {
1392 if (dev
->flags
& IFF_UP
) {
1393 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1394 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1396 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1397 nb
->notifier_call(nb
, NETDEV_UNREGISTER_BATCH
, dev
);
1402 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1405 EXPORT_SYMBOL(register_netdevice_notifier
);
1408 * unregister_netdevice_notifier - unregister a network notifier block
1411 * Unregister a notifier previously registered by
1412 * register_netdevice_notifier(). The notifier is unlinked into the
1413 * kernel structures and may then be reused. A negative errno code
1414 * is returned on a failure.
1416 * After unregistering unregister and down device events are synthesized
1417 * for all devices on the device list to the removed notifier to remove
1418 * the need for special case cleanup code.
1421 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1423 struct net_device
*dev
;
1428 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1433 for_each_netdev(net
, dev
) {
1434 if (dev
->flags
& IFF_UP
) {
1435 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1436 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1438 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1439 nb
->notifier_call(nb
, NETDEV_UNREGISTER_BATCH
, dev
);
1446 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1449 * call_netdevice_notifiers - call all network notifier blocks
1450 * @val: value passed unmodified to notifier function
1451 * @dev: net_device pointer passed unmodified to notifier function
1453 * Call all network notifier blocks. Parameters and return value
1454 * are as for raw_notifier_call_chain().
1457 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1460 return raw_notifier_call_chain(&netdev_chain
, val
, dev
);
1462 EXPORT_SYMBOL(call_netdevice_notifiers
);
1464 static struct static_key netstamp_needed __read_mostly
;
1465 #ifdef HAVE_JUMP_LABEL
1466 /* We are not allowed to call static_key_slow_dec() from irq context
1467 * If net_disable_timestamp() is called from irq context, defer the
1468 * static_key_slow_dec() calls.
1470 static atomic_t netstamp_needed_deferred
;
1473 void net_enable_timestamp(void)
1475 #ifdef HAVE_JUMP_LABEL
1476 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1480 static_key_slow_dec(&netstamp_needed
);
1484 WARN_ON(in_interrupt());
1485 static_key_slow_inc(&netstamp_needed
);
1487 EXPORT_SYMBOL(net_enable_timestamp
);
1489 void net_disable_timestamp(void)
1491 #ifdef HAVE_JUMP_LABEL
1492 if (in_interrupt()) {
1493 atomic_inc(&netstamp_needed_deferred
);
1497 static_key_slow_dec(&netstamp_needed
);
1499 EXPORT_SYMBOL(net_disable_timestamp
);
1501 static inline void net_timestamp_set(struct sk_buff
*skb
)
1503 skb
->tstamp
.tv64
= 0;
1504 if (static_key_false(&netstamp_needed
))
1505 __net_timestamp(skb
);
1508 #define net_timestamp_check(COND, SKB) \
1509 if (static_key_false(&netstamp_needed)) { \
1510 if ((COND) && !(SKB)->tstamp.tv64) \
1511 __net_timestamp(SKB); \
1514 static int net_hwtstamp_validate(struct ifreq *ifr)
1516 struct hwtstamp_config cfg
;
1517 enum hwtstamp_tx_types tx_type
;
1518 enum hwtstamp_rx_filters rx_filter
;
1519 int tx_type_valid
= 0;
1520 int rx_filter_valid
= 0;
1522 if (copy_from_user(&cfg
, ifr
->ifr_data
, sizeof(cfg
)))
1525 if (cfg
.flags
) /* reserved for future extensions */
1528 tx_type
= cfg
.tx_type
;
1529 rx_filter
= cfg
.rx_filter
;
1532 case HWTSTAMP_TX_OFF
:
1533 case HWTSTAMP_TX_ON
:
1534 case HWTSTAMP_TX_ONESTEP_SYNC
:
1539 switch (rx_filter
) {
1540 case HWTSTAMP_FILTER_NONE
:
1541 case HWTSTAMP_FILTER_ALL
:
1542 case HWTSTAMP_FILTER_SOME
:
1543 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT
:
1544 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC
:
1545 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ
:
1546 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT
:
1547 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC
:
1548 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ
:
1549 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT
:
1550 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC
:
1551 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ
:
1552 case HWTSTAMP_FILTER_PTP_V2_EVENT
:
1553 case HWTSTAMP_FILTER_PTP_V2_SYNC
:
1554 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ
:
1555 rx_filter_valid
= 1;
1559 if (!tx_type_valid
|| !rx_filter_valid
)
1565 static inline bool is_skb_forwardable(struct net_device
*dev
,
1566 struct sk_buff
*skb
)
1570 if (!(dev
->flags
& IFF_UP
))
1573 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1574 if (skb
->len
<= len
)
1577 /* if TSO is enabled, we don't care about the length as the packet
1578 * could be forwarded without being segmented before
1580 if (skb_is_gso(skb
))
1587 * dev_forward_skb - loopback an skb to another netif
1589 * @dev: destination network device
1590 * @skb: buffer to forward
1593 * NET_RX_SUCCESS (no congestion)
1594 * NET_RX_DROP (packet was dropped, but freed)
1596 * dev_forward_skb can be used for injecting an skb from the
1597 * start_xmit function of one device into the receive queue
1598 * of another device.
1600 * The receiving device may be in another namespace, so
1601 * we have to clear all information in the skb that could
1602 * impact namespace isolation.
1604 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1606 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1607 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1608 atomic_long_inc(&dev
->rx_dropped
);
1617 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1618 atomic_long_inc(&dev
->rx_dropped
);
1625 skb
->tstamp
.tv64
= 0;
1626 skb
->pkt_type
= PACKET_HOST
;
1627 skb
->protocol
= eth_type_trans(skb
, dev
);
1631 return netif_rx(skb
);
1633 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1635 static inline int deliver_skb(struct sk_buff
*skb
,
1636 struct packet_type
*pt_prev
,
1637 struct net_device
*orig_dev
)
1639 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1641 atomic_inc(&skb
->users
);
1642 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1645 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1647 if (ptype
->af_packet_priv
== NULL
)
1650 if (ptype
->id_match
)
1651 return ptype
->id_match(ptype
, skb
->sk
);
1652 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1659 * Support routine. Sends outgoing frames to any network
1660 * taps currently in use.
1663 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1665 struct packet_type
*ptype
;
1666 struct sk_buff
*skb2
= NULL
;
1667 struct packet_type
*pt_prev
= NULL
;
1670 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1671 /* Never send packets back to the socket
1672 * they originated from - MvS (miquels@drinkel.ow.org)
1674 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1675 (!skb_loop_sk(ptype
, skb
))) {
1677 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1682 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1686 net_timestamp_set(skb2
);
1688 /* skb->nh should be correctly
1689 set by sender, so that the second statement is
1690 just protection against buggy protocols.
1692 skb_reset_mac_header(skb2
);
1694 if (skb_network_header(skb2
) < skb2
->data
||
1695 skb2
->network_header
> skb2
->tail
) {
1696 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1697 ntohs(skb2
->protocol
),
1699 skb_reset_network_header(skb2
);
1702 skb2
->transport_header
= skb2
->network_header
;
1703 skb2
->pkt_type
= PACKET_OUTGOING
;
1708 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1713 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1714 * @dev: Network device
1715 * @txq: number of queues available
1717 * If real_num_tx_queues is changed the tc mappings may no longer be
1718 * valid. To resolve this verify the tc mapping remains valid and if
1719 * not NULL the mapping. With no priorities mapping to this
1720 * offset/count pair it will no longer be used. In the worst case TC0
1721 * is invalid nothing can be done so disable priority mappings. If is
1722 * expected that drivers will fix this mapping if they can before
1723 * calling netif_set_real_num_tx_queues.
1725 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1728 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1730 /* If TC0 is invalidated disable TC mapping */
1731 if (tc
->offset
+ tc
->count
> txq
) {
1732 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1737 /* Invalidated prio to tc mappings set to TC0 */
1738 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1739 int q
= netdev_get_prio_tc_map(dev
, i
);
1741 tc
= &dev
->tc_to_txq
[q
];
1742 if (tc
->offset
+ tc
->count
> txq
) {
1743 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1745 netdev_set_prio_tc_map(dev
, i
, 0);
1751 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1752 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1754 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
1758 if (txq
< 1 || txq
> dev
->num_tx_queues
)
1761 if (dev
->reg_state
== NETREG_REGISTERED
||
1762 dev
->reg_state
== NETREG_UNREGISTERING
) {
1765 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
1771 netif_setup_tc(dev
, txq
);
1773 if (txq
< dev
->real_num_tx_queues
)
1774 qdisc_reset_all_tx_gt(dev
, txq
);
1777 dev
->real_num_tx_queues
= txq
;
1780 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
1784 * netif_set_real_num_rx_queues - set actual number of RX queues used
1785 * @dev: Network device
1786 * @rxq: Actual number of RX queues
1788 * This must be called either with the rtnl_lock held or before
1789 * registration of the net device. Returns 0 on success, or a
1790 * negative error code. If called before registration, it always
1793 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
1797 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
1800 if (dev
->reg_state
== NETREG_REGISTERED
) {
1803 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
1809 dev
->real_num_rx_queues
= rxq
;
1812 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
1816 * netif_get_num_default_rss_queues - default number of RSS queues
1818 * This routine should set an upper limit on the number of RSS queues
1819 * used by default by multiqueue devices.
1821 int netif_get_num_default_rss_queues(void)
1823 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
1825 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
1827 static inline void __netif_reschedule(struct Qdisc
*q
)
1829 struct softnet_data
*sd
;
1830 unsigned long flags
;
1832 local_irq_save(flags
);
1833 sd
= &__get_cpu_var(softnet_data
);
1834 q
->next_sched
= NULL
;
1835 *sd
->output_queue_tailp
= q
;
1836 sd
->output_queue_tailp
= &q
->next_sched
;
1837 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1838 local_irq_restore(flags
);
1841 void __netif_schedule(struct Qdisc
*q
)
1843 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
1844 __netif_reschedule(q
);
1846 EXPORT_SYMBOL(__netif_schedule
);
1848 void dev_kfree_skb_irq(struct sk_buff
*skb
)
1850 if (atomic_dec_and_test(&skb
->users
)) {
1851 struct softnet_data
*sd
;
1852 unsigned long flags
;
1854 local_irq_save(flags
);
1855 sd
= &__get_cpu_var(softnet_data
);
1856 skb
->next
= sd
->completion_queue
;
1857 sd
->completion_queue
= skb
;
1858 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1859 local_irq_restore(flags
);
1862 EXPORT_SYMBOL(dev_kfree_skb_irq
);
1864 void dev_kfree_skb_any(struct sk_buff
*skb
)
1866 if (in_irq() || irqs_disabled())
1867 dev_kfree_skb_irq(skb
);
1871 EXPORT_SYMBOL(dev_kfree_skb_any
);
1875 * netif_device_detach - mark device as removed
1876 * @dev: network device
1878 * Mark device as removed from system and therefore no longer available.
1880 void netif_device_detach(struct net_device
*dev
)
1882 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1883 netif_running(dev
)) {
1884 netif_tx_stop_all_queues(dev
);
1887 EXPORT_SYMBOL(netif_device_detach
);
1890 * netif_device_attach - mark device as attached
1891 * @dev: network device
1893 * Mark device as attached from system and restart if needed.
1895 void netif_device_attach(struct net_device
*dev
)
1897 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1898 netif_running(dev
)) {
1899 netif_tx_wake_all_queues(dev
);
1900 __netdev_watchdog_up(dev
);
1903 EXPORT_SYMBOL(netif_device_attach
);
1905 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
1907 static const netdev_features_t null_features
= 0;
1908 struct net_device
*dev
= skb
->dev
;
1909 const char *driver
= "";
1911 if (dev
&& dev
->dev
.parent
)
1912 driver
= dev_driver_string(dev
->dev
.parent
);
1914 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
1915 "gso_type=%d ip_summed=%d\n",
1916 driver
, dev
? &dev
->features
: &null_features
,
1917 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
1918 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
1919 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
1923 * Invalidate hardware checksum when packet is to be mangled, and
1924 * complete checksum manually on outgoing path.
1926 int skb_checksum_help(struct sk_buff
*skb
)
1929 int ret
= 0, offset
;
1931 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
1932 goto out_set_summed
;
1934 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
1935 skb_warn_bad_offload(skb
);
1939 offset
= skb_checksum_start_offset(skb
);
1940 BUG_ON(offset
>= skb_headlen(skb
));
1941 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
1943 offset
+= skb
->csum_offset
;
1944 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
1946 if (skb_cloned(skb
) &&
1947 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
1948 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
1953 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
1955 skb
->ip_summed
= CHECKSUM_NONE
;
1959 EXPORT_SYMBOL(skb_checksum_help
);
1962 * skb_gso_segment - Perform segmentation on skb.
1963 * @skb: buffer to segment
1964 * @features: features for the output path (see dev->features)
1966 * This function segments the given skb and returns a list of segments.
1968 * It may return NULL if the skb requires no segmentation. This is
1969 * only possible when GSO is used for verifying header integrity.
1971 struct sk_buff
*skb_gso_segment(struct sk_buff
*skb
,
1972 netdev_features_t features
)
1974 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
1975 struct packet_type
*ptype
;
1976 __be16 type
= skb
->protocol
;
1977 int vlan_depth
= ETH_HLEN
;
1980 while (type
== htons(ETH_P_8021Q
)) {
1981 struct vlan_hdr
*vh
;
1983 if (unlikely(!pskb_may_pull(skb
, vlan_depth
+ VLAN_HLEN
)))
1984 return ERR_PTR(-EINVAL
);
1986 vh
= (struct vlan_hdr
*)(skb
->data
+ vlan_depth
);
1987 type
= vh
->h_vlan_encapsulated_proto
;
1988 vlan_depth
+= VLAN_HLEN
;
1991 skb_reset_mac_header(skb
);
1992 skb
->mac_len
= skb
->network_header
- skb
->mac_header
;
1993 __skb_pull(skb
, skb
->mac_len
);
1995 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
1996 skb_warn_bad_offload(skb
);
1998 if (skb_header_cloned(skb
) &&
1999 (err
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
)))
2000 return ERR_PTR(err
);
2004 list_for_each_entry_rcu(ptype
,
2005 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
2006 if (ptype
->type
== type
&& !ptype
->dev
&& ptype
->gso_segment
) {
2007 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2008 err
= ptype
->gso_send_check(skb
);
2009 segs
= ERR_PTR(err
);
2010 if (err
|| skb_gso_ok(skb
, features
))
2012 __skb_push(skb
, (skb
->data
-
2013 skb_network_header(skb
)));
2015 segs
= ptype
->gso_segment(skb
, features
);
2021 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2025 EXPORT_SYMBOL(skb_gso_segment
);
2027 /* Take action when hardware reception checksum errors are detected. */
2029 void netdev_rx_csum_fault(struct net_device
*dev
)
2031 if (net_ratelimit()) {
2032 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2036 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2039 /* Actually, we should eliminate this check as soon as we know, that:
2040 * 1. IOMMU is present and allows to map all the memory.
2041 * 2. No high memory really exists on this machine.
2044 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2046 #ifdef CONFIG_HIGHMEM
2048 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2049 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2050 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2051 if (PageHighMem(skb_frag_page(frag
)))
2056 if (PCI_DMA_BUS_IS_PHYS
) {
2057 struct device
*pdev
= dev
->dev
.parent
;
2061 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2062 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2063 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2064 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2073 void (*destructor
)(struct sk_buff
*skb
);
2076 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2078 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
2080 struct dev_gso_cb
*cb
;
2083 struct sk_buff
*nskb
= skb
->next
;
2085 skb
->next
= nskb
->next
;
2088 } while (skb
->next
);
2090 cb
= DEV_GSO_CB(skb
);
2092 cb
->destructor(skb
);
2096 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2097 * @skb: buffer to segment
2098 * @features: device features as applicable to this skb
2100 * This function segments the given skb and stores the list of segments
2103 static int dev_gso_segment(struct sk_buff
*skb
, netdev_features_t features
)
2105 struct sk_buff
*segs
;
2107 segs
= skb_gso_segment(skb
, features
);
2109 /* Verifying header integrity only. */
2114 return PTR_ERR(segs
);
2117 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
2118 skb
->destructor
= dev_gso_skb_destructor
;
2123 static bool can_checksum_protocol(netdev_features_t features
, __be16 protocol
)
2125 return ((features
& NETIF_F_GEN_CSUM
) ||
2126 ((features
& NETIF_F_V4_CSUM
) &&
2127 protocol
== htons(ETH_P_IP
)) ||
2128 ((features
& NETIF_F_V6_CSUM
) &&
2129 protocol
== htons(ETH_P_IPV6
)) ||
2130 ((features
& NETIF_F_FCOE_CRC
) &&
2131 protocol
== htons(ETH_P_FCOE
)));
2134 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2135 __be16 protocol
, netdev_features_t features
)
2137 if (!can_checksum_protocol(features
, protocol
)) {
2138 features
&= ~NETIF_F_ALL_CSUM
;
2139 features
&= ~NETIF_F_SG
;
2140 } else if (illegal_highdma(skb
->dev
, skb
)) {
2141 features
&= ~NETIF_F_SG
;
2147 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2149 __be16 protocol
= skb
->protocol
;
2150 netdev_features_t features
= skb
->dev
->features
;
2152 if (skb_shinfo(skb
)->gso_segs
> skb
->dev
->gso_max_segs
)
2153 features
&= ~NETIF_F_GSO_MASK
;
2155 if (protocol
== htons(ETH_P_8021Q
)) {
2156 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
2157 protocol
= veh
->h_vlan_encapsulated_proto
;
2158 } else if (!vlan_tx_tag_present(skb
)) {
2159 return harmonize_features(skb
, protocol
, features
);
2162 features
&= (skb
->dev
->vlan_features
| NETIF_F_HW_VLAN_TX
);
2164 if (protocol
!= htons(ETH_P_8021Q
)) {
2165 return harmonize_features(skb
, protocol
, features
);
2167 features
&= NETIF_F_SG
| NETIF_F_HIGHDMA
| NETIF_F_FRAGLIST
|
2168 NETIF_F_GEN_CSUM
| NETIF_F_HW_VLAN_TX
;
2169 return harmonize_features(skb
, protocol
, features
);
2172 EXPORT_SYMBOL(netif_skb_features
);
2175 * Returns true if either:
2176 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2177 * 2. skb is fragmented and the device does not support SG, or if
2178 * at least one of fragments is in highmem and device does not
2179 * support DMA from it.
2181 static inline int skb_needs_linearize(struct sk_buff
*skb
,
2184 return skb_is_nonlinear(skb
) &&
2185 ((skb_has_frag_list(skb
) &&
2186 !(features
& NETIF_F_FRAGLIST
)) ||
2187 (skb_shinfo(skb
)->nr_frags
&&
2188 !(features
& NETIF_F_SG
)));
2191 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
2192 struct netdev_queue
*txq
)
2194 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2195 int rc
= NETDEV_TX_OK
;
2196 unsigned int skb_len
;
2198 if (likely(!skb
->next
)) {
2199 netdev_features_t features
;
2202 * If device doesn't need skb->dst, release it right now while
2203 * its hot in this cpu cache
2205 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2208 if (!list_empty(&ptype_all
))
2209 dev_queue_xmit_nit(skb
, dev
);
2211 features
= netif_skb_features(skb
);
2213 if (vlan_tx_tag_present(skb
) &&
2214 !(features
& NETIF_F_HW_VLAN_TX
)) {
2215 skb
= __vlan_put_tag(skb
, vlan_tx_tag_get(skb
));
2222 if (netif_needs_gso(skb
, features
)) {
2223 if (unlikely(dev_gso_segment(skb
, features
)))
2228 if (skb_needs_linearize(skb
, features
) &&
2229 __skb_linearize(skb
))
2232 /* If packet is not checksummed and device does not
2233 * support checksumming for this protocol, complete
2234 * checksumming here.
2236 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2237 skb_set_transport_header(skb
,
2238 skb_checksum_start_offset(skb
));
2239 if (!(features
& NETIF_F_ALL_CSUM
) &&
2240 skb_checksum_help(skb
))
2246 rc
= ops
->ndo_start_xmit(skb
, dev
);
2247 trace_net_dev_xmit(skb
, rc
, dev
, skb_len
);
2248 if (rc
== NETDEV_TX_OK
)
2249 txq_trans_update(txq
);
2255 struct sk_buff
*nskb
= skb
->next
;
2257 skb
->next
= nskb
->next
;
2261 * If device doesn't need nskb->dst, release it right now while
2262 * its hot in this cpu cache
2264 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2267 skb_len
= nskb
->len
;
2268 rc
= ops
->ndo_start_xmit(nskb
, dev
);
2269 trace_net_dev_xmit(nskb
, rc
, dev
, skb_len
);
2270 if (unlikely(rc
!= NETDEV_TX_OK
)) {
2271 if (rc
& ~NETDEV_TX_MASK
)
2272 goto out_kfree_gso_skb
;
2273 nskb
->next
= skb
->next
;
2277 txq_trans_update(txq
);
2278 if (unlikely(netif_xmit_stopped(txq
) && skb
->next
))
2279 return NETDEV_TX_BUSY
;
2280 } while (skb
->next
);
2283 if (likely(skb
->next
== NULL
))
2284 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
2291 static u32 hashrnd __read_mostly
;
2294 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2295 * to be used as a distribution range.
2297 u16
__skb_tx_hash(const struct net_device
*dev
, const struct sk_buff
*skb
,
2298 unsigned int num_tx_queues
)
2302 u16 qcount
= num_tx_queues
;
2304 if (skb_rx_queue_recorded(skb
)) {
2305 hash
= skb_get_rx_queue(skb
);
2306 while (unlikely(hash
>= num_tx_queues
))
2307 hash
-= num_tx_queues
;
2312 u8 tc
= netdev_get_prio_tc_map(dev
, skb
->priority
);
2313 qoffset
= dev
->tc_to_txq
[tc
].offset
;
2314 qcount
= dev
->tc_to_txq
[tc
].count
;
2317 if (skb
->sk
&& skb
->sk
->sk_hash
)
2318 hash
= skb
->sk
->sk_hash
;
2320 hash
= (__force u16
) skb
->protocol
;
2321 hash
= jhash_1word(hash
, hashrnd
);
2323 return (u16
) (((u64
) hash
* qcount
) >> 32) + qoffset
;
2325 EXPORT_SYMBOL(__skb_tx_hash
);
2327 static inline u16
dev_cap_txqueue(struct net_device
*dev
, u16 queue_index
)
2329 if (unlikely(queue_index
>= dev
->real_num_tx_queues
)) {
2330 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
2331 dev
->name
, queue_index
,
2332 dev
->real_num_tx_queues
);
2338 static inline int get_xps_queue(struct net_device
*dev
, struct sk_buff
*skb
)
2341 struct xps_dev_maps
*dev_maps
;
2342 struct xps_map
*map
;
2343 int queue_index
= -1;
2346 dev_maps
= rcu_dereference(dev
->xps_maps
);
2348 map
= rcu_dereference(
2349 dev_maps
->cpu_map
[raw_smp_processor_id()]);
2352 queue_index
= map
->queues
[0];
2355 if (skb
->sk
&& skb
->sk
->sk_hash
)
2356 hash
= skb
->sk
->sk_hash
;
2358 hash
= (__force u16
) skb
->protocol
^
2360 hash
= jhash_1word(hash
, hashrnd
);
2361 queue_index
= map
->queues
[
2362 ((u64
)hash
* map
->len
) >> 32];
2364 if (unlikely(queue_index
>= dev
->real_num_tx_queues
))
2376 static struct netdev_queue
*dev_pick_tx(struct net_device
*dev
,
2377 struct sk_buff
*skb
)
2380 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2382 if (dev
->real_num_tx_queues
== 1)
2384 else if (ops
->ndo_select_queue
) {
2385 queue_index
= ops
->ndo_select_queue(dev
, skb
);
2386 queue_index
= dev_cap_txqueue(dev
, queue_index
);
2388 struct sock
*sk
= skb
->sk
;
2389 queue_index
= sk_tx_queue_get(sk
);
2391 if (queue_index
< 0 || skb
->ooo_okay
||
2392 queue_index
>= dev
->real_num_tx_queues
) {
2393 int old_index
= queue_index
;
2395 queue_index
= get_xps_queue(dev
, skb
);
2396 if (queue_index
< 0)
2397 queue_index
= skb_tx_hash(dev
, skb
);
2399 if (queue_index
!= old_index
&& sk
) {
2400 struct dst_entry
*dst
=
2401 rcu_dereference_check(sk
->sk_dst_cache
, 1);
2403 if (dst
&& skb_dst(skb
) == dst
)
2404 sk_tx_queue_set(sk
, queue_index
);
2409 skb_set_queue_mapping(skb
, queue_index
);
2410 return netdev_get_tx_queue(dev
, queue_index
);
2413 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2414 struct net_device
*dev
,
2415 struct netdev_queue
*txq
)
2417 spinlock_t
*root_lock
= qdisc_lock(q
);
2421 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2422 qdisc_calculate_pkt_len(skb
, q
);
2424 * Heuristic to force contended enqueues to serialize on a
2425 * separate lock before trying to get qdisc main lock.
2426 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2427 * and dequeue packets faster.
2429 contended
= qdisc_is_running(q
);
2430 if (unlikely(contended
))
2431 spin_lock(&q
->busylock
);
2433 spin_lock(root_lock
);
2434 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2437 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2438 qdisc_run_begin(q
)) {
2440 * This is a work-conserving queue; there are no old skbs
2441 * waiting to be sent out; and the qdisc is not running -
2442 * xmit the skb directly.
2444 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2447 qdisc_bstats_update(q
, skb
);
2449 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2450 if (unlikely(contended
)) {
2451 spin_unlock(&q
->busylock
);
2458 rc
= NET_XMIT_SUCCESS
;
2461 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2462 if (qdisc_run_begin(q
)) {
2463 if (unlikely(contended
)) {
2464 spin_unlock(&q
->busylock
);
2470 spin_unlock(root_lock
);
2471 if (unlikely(contended
))
2472 spin_unlock(&q
->busylock
);
2476 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
2477 static void skb_update_prio(struct sk_buff
*skb
)
2479 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2481 if (!skb
->priority
&& skb
->sk
&& map
) {
2482 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2484 if (prioidx
< map
->priomap_len
)
2485 skb
->priority
= map
->priomap
[prioidx
];
2489 #define skb_update_prio(skb)
2492 static DEFINE_PER_CPU(int, xmit_recursion
);
2493 #define RECURSION_LIMIT 10
2496 * dev_loopback_xmit - loop back @skb
2497 * @skb: buffer to transmit
2499 int dev_loopback_xmit(struct sk_buff
*skb
)
2501 skb_reset_mac_header(skb
);
2502 __skb_pull(skb
, skb_network_offset(skb
));
2503 skb
->pkt_type
= PACKET_LOOPBACK
;
2504 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2505 WARN_ON(!skb_dst(skb
));
2510 EXPORT_SYMBOL(dev_loopback_xmit
);
2513 * dev_queue_xmit - transmit a buffer
2514 * @skb: buffer to transmit
2516 * Queue a buffer for transmission to a network device. The caller must
2517 * have set the device and priority and built the buffer before calling
2518 * this function. The function can be called from an interrupt.
2520 * A negative errno code is returned on a failure. A success does not
2521 * guarantee the frame will be transmitted as it may be dropped due
2522 * to congestion or traffic shaping.
2524 * -----------------------------------------------------------------------------------
2525 * I notice this method can also return errors from the queue disciplines,
2526 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2529 * Regardless of the return value, the skb is consumed, so it is currently
2530 * difficult to retry a send to this method. (You can bump the ref count
2531 * before sending to hold a reference for retry if you are careful.)
2533 * When calling this method, interrupts MUST be enabled. This is because
2534 * the BH enable code must have IRQs enabled so that it will not deadlock.
2537 int dev_queue_xmit(struct sk_buff
*skb
)
2539 struct net_device
*dev
= skb
->dev
;
2540 struct netdev_queue
*txq
;
2544 /* Disable soft irqs for various locks below. Also
2545 * stops preemption for RCU.
2549 skb_update_prio(skb
);
2551 txq
= dev_pick_tx(dev
, skb
);
2552 q
= rcu_dereference_bh(txq
->qdisc
);
2554 #ifdef CONFIG_NET_CLS_ACT
2555 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2557 trace_net_dev_queue(skb
);
2559 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2563 /* The device has no queue. Common case for software devices:
2564 loopback, all the sorts of tunnels...
2566 Really, it is unlikely that netif_tx_lock protection is necessary
2567 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2569 However, it is possible, that they rely on protection
2572 Check this and shot the lock. It is not prone from deadlocks.
2573 Either shot noqueue qdisc, it is even simpler 8)
2575 if (dev
->flags
& IFF_UP
) {
2576 int cpu
= smp_processor_id(); /* ok because BHs are off */
2578 if (txq
->xmit_lock_owner
!= cpu
) {
2580 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2581 goto recursion_alert
;
2583 HARD_TX_LOCK(dev
, txq
, cpu
);
2585 if (!netif_xmit_stopped(txq
)) {
2586 __this_cpu_inc(xmit_recursion
);
2587 rc
= dev_hard_start_xmit(skb
, dev
, txq
);
2588 __this_cpu_dec(xmit_recursion
);
2589 if (dev_xmit_complete(rc
)) {
2590 HARD_TX_UNLOCK(dev
, txq
);
2594 HARD_TX_UNLOCK(dev
, txq
);
2595 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2598 /* Recursion is detected! It is possible,
2602 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2608 rcu_read_unlock_bh();
2613 rcu_read_unlock_bh();
2616 EXPORT_SYMBOL(dev_queue_xmit
);
2619 /*=======================================================================
2621 =======================================================================*/
2623 int netdev_max_backlog __read_mostly
= 1000;
2624 int netdev_tstamp_prequeue __read_mostly
= 1;
2625 int netdev_budget __read_mostly
= 300;
2626 int weight_p __read_mostly
= 64; /* old backlog weight */
2628 /* Called with irq disabled */
2629 static inline void ____napi_schedule(struct softnet_data
*sd
,
2630 struct napi_struct
*napi
)
2632 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
2633 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2637 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2638 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2639 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2640 * if hash is a canonical 4-tuple hash over transport ports.
2642 void __skb_get_rxhash(struct sk_buff
*skb
)
2644 struct flow_keys keys
;
2647 if (!skb_flow_dissect(skb
, &keys
))
2651 if ((__force u16
)keys
.port16
[1] < (__force u16
)keys
.port16
[0])
2652 swap(keys
.port16
[0], keys
.port16
[1]);
2656 /* get a consistent hash (same value on both flow directions) */
2657 if ((__force u32
)keys
.dst
< (__force u32
)keys
.src
)
2658 swap(keys
.dst
, keys
.src
);
2660 hash
= jhash_3words((__force u32
)keys
.dst
,
2661 (__force u32
)keys
.src
,
2662 (__force u32
)keys
.ports
, hashrnd
);
2668 EXPORT_SYMBOL(__skb_get_rxhash
);
2672 /* One global table that all flow-based protocols share. */
2673 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
2674 EXPORT_SYMBOL(rps_sock_flow_table
);
2676 struct static_key rps_needed __read_mostly
;
2678 static struct rps_dev_flow
*
2679 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2680 struct rps_dev_flow
*rflow
, u16 next_cpu
)
2682 if (next_cpu
!= RPS_NO_CPU
) {
2683 #ifdef CONFIG_RFS_ACCEL
2684 struct netdev_rx_queue
*rxqueue
;
2685 struct rps_dev_flow_table
*flow_table
;
2686 struct rps_dev_flow
*old_rflow
;
2691 /* Should we steer this flow to a different hardware queue? */
2692 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
2693 !(dev
->features
& NETIF_F_NTUPLE
))
2695 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
2696 if (rxq_index
== skb_get_rx_queue(skb
))
2699 rxqueue
= dev
->_rx
+ rxq_index
;
2700 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2703 flow_id
= skb
->rxhash
& flow_table
->mask
;
2704 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
2705 rxq_index
, flow_id
);
2709 rflow
= &flow_table
->flows
[flow_id
];
2711 if (old_rflow
->filter
== rflow
->filter
)
2712 old_rflow
->filter
= RPS_NO_FILTER
;
2716 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
2719 rflow
->cpu
= next_cpu
;
2724 * get_rps_cpu is called from netif_receive_skb and returns the target
2725 * CPU from the RPS map of the receiving queue for a given skb.
2726 * rcu_read_lock must be held on entry.
2728 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2729 struct rps_dev_flow
**rflowp
)
2731 struct netdev_rx_queue
*rxqueue
;
2732 struct rps_map
*map
;
2733 struct rps_dev_flow_table
*flow_table
;
2734 struct rps_sock_flow_table
*sock_flow_table
;
2738 if (skb_rx_queue_recorded(skb
)) {
2739 u16 index
= skb_get_rx_queue(skb
);
2740 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
2741 WARN_ONCE(dev
->real_num_rx_queues
> 1,
2742 "%s received packet on queue %u, but number "
2743 "of RX queues is %u\n",
2744 dev
->name
, index
, dev
->real_num_rx_queues
);
2747 rxqueue
= dev
->_rx
+ index
;
2751 map
= rcu_dereference(rxqueue
->rps_map
);
2753 if (map
->len
== 1 &&
2754 !rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2755 tcpu
= map
->cpus
[0];
2756 if (cpu_online(tcpu
))
2760 } else if (!rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2764 skb_reset_network_header(skb
);
2765 if (!skb_get_rxhash(skb
))
2768 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2769 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
2770 if (flow_table
&& sock_flow_table
) {
2772 struct rps_dev_flow
*rflow
;
2774 rflow
= &flow_table
->flows
[skb
->rxhash
& flow_table
->mask
];
2777 next_cpu
= sock_flow_table
->ents
[skb
->rxhash
&
2778 sock_flow_table
->mask
];
2781 * If the desired CPU (where last recvmsg was done) is
2782 * different from current CPU (one in the rx-queue flow
2783 * table entry), switch if one of the following holds:
2784 * - Current CPU is unset (equal to RPS_NO_CPU).
2785 * - Current CPU is offline.
2786 * - The current CPU's queue tail has advanced beyond the
2787 * last packet that was enqueued using this table entry.
2788 * This guarantees that all previous packets for the flow
2789 * have been dequeued, thus preserving in order delivery.
2791 if (unlikely(tcpu
!= next_cpu
) &&
2792 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
2793 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
2794 rflow
->last_qtail
)) >= 0))
2795 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
2797 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
2805 tcpu
= map
->cpus
[((u64
) skb
->rxhash
* map
->len
) >> 32];
2807 if (cpu_online(tcpu
)) {
2817 #ifdef CONFIG_RFS_ACCEL
2820 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2821 * @dev: Device on which the filter was set
2822 * @rxq_index: RX queue index
2823 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2824 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2826 * Drivers that implement ndo_rx_flow_steer() should periodically call
2827 * this function for each installed filter and remove the filters for
2828 * which it returns %true.
2830 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
2831 u32 flow_id
, u16 filter_id
)
2833 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
2834 struct rps_dev_flow_table
*flow_table
;
2835 struct rps_dev_flow
*rflow
;
2840 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2841 if (flow_table
&& flow_id
<= flow_table
->mask
) {
2842 rflow
= &flow_table
->flows
[flow_id
];
2843 cpu
= ACCESS_ONCE(rflow
->cpu
);
2844 if (rflow
->filter
== filter_id
&& cpu
!= RPS_NO_CPU
&&
2845 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
2846 rflow
->last_qtail
) <
2847 (int)(10 * flow_table
->mask
)))
2853 EXPORT_SYMBOL(rps_may_expire_flow
);
2855 #endif /* CONFIG_RFS_ACCEL */
2857 /* Called from hardirq (IPI) context */
2858 static void rps_trigger_softirq(void *data
)
2860 struct softnet_data
*sd
= data
;
2862 ____napi_schedule(sd
, &sd
->backlog
);
2866 #endif /* CONFIG_RPS */
2869 * Check if this softnet_data structure is another cpu one
2870 * If yes, queue it to our IPI list and return 1
2873 static int rps_ipi_queued(struct softnet_data
*sd
)
2876 struct softnet_data
*mysd
= &__get_cpu_var(softnet_data
);
2879 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
2880 mysd
->rps_ipi_list
= sd
;
2882 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2885 #endif /* CONFIG_RPS */
2890 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2891 * queue (may be a remote CPU queue).
2893 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
2894 unsigned int *qtail
)
2896 struct softnet_data
*sd
;
2897 unsigned long flags
;
2899 sd
= &per_cpu(softnet_data
, cpu
);
2901 local_irq_save(flags
);
2904 if (skb_queue_len(&sd
->input_pkt_queue
) <= netdev_max_backlog
) {
2905 if (skb_queue_len(&sd
->input_pkt_queue
)) {
2907 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
2908 input_queue_tail_incr_save(sd
, qtail
);
2910 local_irq_restore(flags
);
2911 return NET_RX_SUCCESS
;
2914 /* Schedule NAPI for backlog device
2915 * We can use non atomic operation since we own the queue lock
2917 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
2918 if (!rps_ipi_queued(sd
))
2919 ____napi_schedule(sd
, &sd
->backlog
);
2927 local_irq_restore(flags
);
2929 atomic_long_inc(&skb
->dev
->rx_dropped
);
2935 * netif_rx - post buffer to the network code
2936 * @skb: buffer to post
2938 * This function receives a packet from a device driver and queues it for
2939 * the upper (protocol) levels to process. It always succeeds. The buffer
2940 * may be dropped during processing for congestion control or by the
2944 * NET_RX_SUCCESS (no congestion)
2945 * NET_RX_DROP (packet was dropped)
2949 int netif_rx(struct sk_buff
*skb
)
2953 /* if netpoll wants it, pretend we never saw it */
2954 if (netpoll_rx(skb
))
2957 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
2959 trace_netif_rx(skb
);
2961 if (static_key_false(&rps_needed
)) {
2962 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
2968 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
2970 cpu
= smp_processor_id();
2972 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
2980 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
2985 EXPORT_SYMBOL(netif_rx
);
2987 int netif_rx_ni(struct sk_buff
*skb
)
2992 err
= netif_rx(skb
);
2993 if (local_softirq_pending())
2999 EXPORT_SYMBOL(netif_rx_ni
);
3001 static void net_tx_action(struct softirq_action
*h
)
3003 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3005 if (sd
->completion_queue
) {
3006 struct sk_buff
*clist
;
3008 local_irq_disable();
3009 clist
= sd
->completion_queue
;
3010 sd
->completion_queue
= NULL
;
3014 struct sk_buff
*skb
= clist
;
3015 clist
= clist
->next
;
3017 WARN_ON(atomic_read(&skb
->users
));
3018 trace_kfree_skb(skb
, net_tx_action
);
3023 if (sd
->output_queue
) {
3026 local_irq_disable();
3027 head
= sd
->output_queue
;
3028 sd
->output_queue
= NULL
;
3029 sd
->output_queue_tailp
= &sd
->output_queue
;
3033 struct Qdisc
*q
= head
;
3034 spinlock_t
*root_lock
;
3036 head
= head
->next_sched
;
3038 root_lock
= qdisc_lock(q
);
3039 if (spin_trylock(root_lock
)) {
3040 smp_mb__before_clear_bit();
3041 clear_bit(__QDISC_STATE_SCHED
,
3044 spin_unlock(root_lock
);
3046 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3048 __netif_reschedule(q
);
3050 smp_mb__before_clear_bit();
3051 clear_bit(__QDISC_STATE_SCHED
,
3059 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3060 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3061 /* This hook is defined here for ATM LANE */
3062 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3063 unsigned char *addr
) __read_mostly
;
3064 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3067 #ifdef CONFIG_NET_CLS_ACT
3068 /* TODO: Maybe we should just force sch_ingress to be compiled in
3069 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3070 * a compare and 2 stores extra right now if we dont have it on
3071 * but have CONFIG_NET_CLS_ACT
3072 * NOTE: This doesn't stop any functionality; if you dont have
3073 * the ingress scheduler, you just can't add policies on ingress.
3076 static int ing_filter(struct sk_buff
*skb
, struct netdev_queue
*rxq
)
3078 struct net_device
*dev
= skb
->dev
;
3079 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
3080 int result
= TC_ACT_OK
;
3083 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
3084 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3085 skb
->skb_iif
, dev
->ifindex
);
3089 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
3090 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3093 if (q
!= &noop_qdisc
) {
3094 spin_lock(qdisc_lock(q
));
3095 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
3096 result
= qdisc_enqueue_root(skb
, q
);
3097 spin_unlock(qdisc_lock(q
));
3103 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3104 struct packet_type
**pt_prev
,
3105 int *ret
, struct net_device
*orig_dev
)
3107 struct netdev_queue
*rxq
= rcu_dereference(skb
->dev
->ingress_queue
);
3109 if (!rxq
|| rxq
->qdisc
== &noop_qdisc
)
3113 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3117 switch (ing_filter(skb
, rxq
)) {
3131 * netdev_rx_handler_register - register receive handler
3132 * @dev: device to register a handler for
3133 * @rx_handler: receive handler to register
3134 * @rx_handler_data: data pointer that is used by rx handler
3136 * Register a receive hander for a device. This handler will then be
3137 * called from __netif_receive_skb. A negative errno code is returned
3140 * The caller must hold the rtnl_mutex.
3142 * For a general description of rx_handler, see enum rx_handler_result.
3144 int netdev_rx_handler_register(struct net_device
*dev
,
3145 rx_handler_func_t
*rx_handler
,
3146 void *rx_handler_data
)
3150 if (dev
->rx_handler
)
3153 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3154 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3158 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3161 * netdev_rx_handler_unregister - unregister receive handler
3162 * @dev: device to unregister a handler from
3164 * Unregister a receive hander from a device.
3166 * The caller must hold the rtnl_mutex.
3168 void netdev_rx_handler_unregister(struct net_device
*dev
)
3172 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3173 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3175 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3178 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3179 * the special handling of PFMEMALLOC skbs.
3181 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3183 switch (skb
->protocol
) {
3184 case __constant_htons(ETH_P_ARP
):
3185 case __constant_htons(ETH_P_IP
):
3186 case __constant_htons(ETH_P_IPV6
):
3187 case __constant_htons(ETH_P_8021Q
):
3194 static int __netif_receive_skb(struct sk_buff
*skb
)
3196 struct packet_type
*ptype
, *pt_prev
;
3197 rx_handler_func_t
*rx_handler
;
3198 struct net_device
*orig_dev
;
3199 struct net_device
*null_or_dev
;
3200 bool deliver_exact
= false;
3201 int ret
= NET_RX_DROP
;
3203 unsigned long pflags
= current
->flags
;
3205 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3207 trace_netif_receive_skb(skb
);
3210 * PFMEMALLOC skbs are special, they should
3211 * - be delivered to SOCK_MEMALLOC sockets only
3212 * - stay away from userspace
3213 * - have bounded memory usage
3215 * Use PF_MEMALLOC as this saves us from propagating the allocation
3216 * context down to all allocation sites.
3218 if (sk_memalloc_socks() && skb_pfmemalloc(skb
))
3219 current
->flags
|= PF_MEMALLOC
;
3221 /* if we've gotten here through NAPI, check netpoll */
3222 if (netpoll_receive_skb(skb
))
3225 orig_dev
= skb
->dev
;
3227 skb_reset_network_header(skb
);
3228 skb_reset_transport_header(skb
);
3229 skb_reset_mac_len(skb
);
3236 skb
->skb_iif
= skb
->dev
->ifindex
;
3238 __this_cpu_inc(softnet_data
.processed
);
3240 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
)) {
3241 skb
= vlan_untag(skb
);
3246 #ifdef CONFIG_NET_CLS_ACT
3247 if (skb
->tc_verd
& TC_NCLS
) {
3248 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3253 if (sk_memalloc_socks() && skb_pfmemalloc(skb
))
3256 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3257 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
) {
3259 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3265 #ifdef CONFIG_NET_CLS_ACT
3266 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3272 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)
3273 && !skb_pfmemalloc_protocol(skb
))
3276 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3277 if (vlan_tx_tag_present(skb
)) {
3279 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3282 if (vlan_do_receive(&skb
, !rx_handler
))
3284 else if (unlikely(!skb
))
3290 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3293 switch (rx_handler(&skb
)) {
3294 case RX_HANDLER_CONSUMED
:
3296 case RX_HANDLER_ANOTHER
:
3298 case RX_HANDLER_EXACT
:
3299 deliver_exact
= true;
3300 case RX_HANDLER_PASS
:
3307 /* deliver only exact match when indicated */
3308 null_or_dev
= deliver_exact
? skb
->dev
: NULL
;
3310 type
= skb
->protocol
;
3311 list_for_each_entry_rcu(ptype
,
3312 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
3313 if (ptype
->type
== type
&&
3314 (ptype
->dev
== null_or_dev
|| ptype
->dev
== skb
->dev
||
3315 ptype
->dev
== orig_dev
)) {
3317 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3323 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3326 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3329 atomic_long_inc(&skb
->dev
->rx_dropped
);
3331 /* Jamal, now you will not able to escape explaining
3332 * me how you were going to use this. :-)
3340 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3345 * netif_receive_skb - process receive buffer from network
3346 * @skb: buffer to process
3348 * netif_receive_skb() is the main receive data processing function.
3349 * It always succeeds. The buffer may be dropped during processing
3350 * for congestion control or by the protocol layers.
3352 * This function may only be called from softirq context and interrupts
3353 * should be enabled.
3355 * Return values (usually ignored):
3356 * NET_RX_SUCCESS: no congestion
3357 * NET_RX_DROP: packet was dropped
3359 int netif_receive_skb(struct sk_buff
*skb
)
3361 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3363 if (skb_defer_rx_timestamp(skb
))
3364 return NET_RX_SUCCESS
;
3367 if (static_key_false(&rps_needed
)) {
3368 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3373 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3376 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3383 return __netif_receive_skb(skb
);
3385 EXPORT_SYMBOL(netif_receive_skb
);
3387 /* Network device is going away, flush any packets still pending
3388 * Called with irqs disabled.
3390 static void flush_backlog(void *arg
)
3392 struct net_device
*dev
= arg
;
3393 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3394 struct sk_buff
*skb
, *tmp
;
3397 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3398 if (skb
->dev
== dev
) {
3399 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3401 input_queue_head_incr(sd
);
3406 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3407 if (skb
->dev
== dev
) {
3408 __skb_unlink(skb
, &sd
->process_queue
);
3410 input_queue_head_incr(sd
);
3415 static int napi_gro_complete(struct sk_buff
*skb
)
3417 struct packet_type
*ptype
;
3418 __be16 type
= skb
->protocol
;
3419 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
3422 if (NAPI_GRO_CB(skb
)->count
== 1) {
3423 skb_shinfo(skb
)->gso_size
= 0;
3428 list_for_each_entry_rcu(ptype
, head
, list
) {
3429 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_complete
)
3432 err
= ptype
->gro_complete(skb
);
3438 WARN_ON(&ptype
->list
== head
);
3440 return NET_RX_SUCCESS
;
3444 return netif_receive_skb(skb
);
3447 inline void napi_gro_flush(struct napi_struct
*napi
)
3449 struct sk_buff
*skb
, *next
;
3451 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
3454 napi_gro_complete(skb
);
3457 napi
->gro_count
= 0;
3458 napi
->gro_list
= NULL
;
3460 EXPORT_SYMBOL(napi_gro_flush
);
3462 enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3464 struct sk_buff
**pp
= NULL
;
3465 struct packet_type
*ptype
;
3466 __be16 type
= skb
->protocol
;
3467 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
3470 enum gro_result ret
;
3472 if (!(skb
->dev
->features
& NETIF_F_GRO
) || netpoll_rx_on(skb
))
3475 if (skb_is_gso(skb
) || skb_has_frag_list(skb
))
3479 list_for_each_entry_rcu(ptype
, head
, list
) {
3480 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_receive
)
3483 skb_set_network_header(skb
, skb_gro_offset(skb
));
3484 mac_len
= skb
->network_header
- skb
->mac_header
;
3485 skb
->mac_len
= mac_len
;
3486 NAPI_GRO_CB(skb
)->same_flow
= 0;
3487 NAPI_GRO_CB(skb
)->flush
= 0;
3488 NAPI_GRO_CB(skb
)->free
= 0;
3490 pp
= ptype
->gro_receive(&napi
->gro_list
, skb
);
3495 if (&ptype
->list
== head
)
3498 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
3499 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
3502 struct sk_buff
*nskb
= *pp
;
3506 napi_gro_complete(nskb
);
3513 if (NAPI_GRO_CB(skb
)->flush
|| napi
->gro_count
>= MAX_GRO_SKBS
)
3517 NAPI_GRO_CB(skb
)->count
= 1;
3518 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
3519 skb
->next
= napi
->gro_list
;
3520 napi
->gro_list
= skb
;
3524 if (skb_headlen(skb
) < skb_gro_offset(skb
)) {
3525 int grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
3527 BUG_ON(skb
->end
- skb
->tail
< grow
);
3529 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3532 skb
->data_len
-= grow
;
3534 skb_shinfo(skb
)->frags
[0].page_offset
+= grow
;
3535 skb_frag_size_sub(&skb_shinfo(skb
)->frags
[0], grow
);
3537 if (unlikely(!skb_frag_size(&skb_shinfo(skb
)->frags
[0]))) {
3538 skb_frag_unref(skb
, 0);
3539 memmove(skb_shinfo(skb
)->frags
,
3540 skb_shinfo(skb
)->frags
+ 1,
3541 --skb_shinfo(skb
)->nr_frags
* sizeof(skb_frag_t
));
3552 EXPORT_SYMBOL(dev_gro_receive
);
3554 static inline gro_result_t
3555 __napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3558 unsigned int maclen
= skb
->dev
->hard_header_len
;
3560 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3561 unsigned long diffs
;
3563 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
3564 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
3565 if (maclen
== ETH_HLEN
)
3566 diffs
|= compare_ether_header(skb_mac_header(p
),
3567 skb_gro_mac_header(skb
));
3569 diffs
= memcmp(skb_mac_header(p
),
3570 skb_gro_mac_header(skb
),
3572 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
3573 NAPI_GRO_CB(p
)->flush
= 0;
3576 return dev_gro_receive(napi
, skb
);
3579 gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
3583 if (netif_receive_skb(skb
))
3591 case GRO_MERGED_FREE
:
3592 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
3593 kmem_cache_free(skbuff_head_cache
, skb
);
3605 EXPORT_SYMBOL(napi_skb_finish
);
3607 void skb_gro_reset_offset(struct sk_buff
*skb
)
3609 NAPI_GRO_CB(skb
)->data_offset
= 0;
3610 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3611 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3613 if (skb
->mac_header
== skb
->tail
&&
3614 !PageHighMem(skb_frag_page(&skb_shinfo(skb
)->frags
[0]))) {
3615 NAPI_GRO_CB(skb
)->frag0
=
3616 skb_frag_address(&skb_shinfo(skb
)->frags
[0]);
3617 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(&skb_shinfo(skb
)->frags
[0]);
3620 EXPORT_SYMBOL(skb_gro_reset_offset
);
3622 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3624 skb_gro_reset_offset(skb
);
3626 return napi_skb_finish(__napi_gro_receive(napi
, skb
), skb
);
3628 EXPORT_SYMBOL(napi_gro_receive
);
3630 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
3632 __skb_pull(skb
, skb_headlen(skb
));
3633 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3634 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
3636 skb
->dev
= napi
->dev
;
3642 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
3644 struct sk_buff
*skb
= napi
->skb
;
3647 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
3653 EXPORT_SYMBOL(napi_get_frags
);
3655 gro_result_t
napi_frags_finish(struct napi_struct
*napi
, struct sk_buff
*skb
,
3661 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
3663 if (ret
== GRO_HELD
)
3664 skb_gro_pull(skb
, -ETH_HLEN
);
3665 else if (netif_receive_skb(skb
))
3670 case GRO_MERGED_FREE
:
3671 napi_reuse_skb(napi
, skb
);
3680 EXPORT_SYMBOL(napi_frags_finish
);
3682 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
3684 struct sk_buff
*skb
= napi
->skb
;
3691 skb_reset_mac_header(skb
);
3692 skb_gro_reset_offset(skb
);
3694 off
= skb_gro_offset(skb
);
3695 hlen
= off
+ sizeof(*eth
);
3696 eth
= skb_gro_header_fast(skb
, off
);
3697 if (skb_gro_header_hard(skb
, hlen
)) {
3698 eth
= skb_gro_header_slow(skb
, hlen
, off
);
3699 if (unlikely(!eth
)) {
3700 napi_reuse_skb(napi
, skb
);
3706 skb_gro_pull(skb
, sizeof(*eth
));
3709 * This works because the only protocols we care about don't require
3710 * special handling. We'll fix it up properly at the end.
3712 skb
->protocol
= eth
->h_proto
;
3718 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
3720 struct sk_buff
*skb
= napi_frags_skb(napi
);
3725 return napi_frags_finish(napi
, skb
, __napi_gro_receive(napi
, skb
));
3727 EXPORT_SYMBOL(napi_gro_frags
);
3730 * net_rps_action sends any pending IPI's for rps.
3731 * Note: called with local irq disabled, but exits with local irq enabled.
3733 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
3736 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
3739 sd
->rps_ipi_list
= NULL
;
3743 /* Send pending IPI's to kick RPS processing on remote cpus. */
3745 struct softnet_data
*next
= remsd
->rps_ipi_next
;
3747 if (cpu_online(remsd
->cpu
))
3748 __smp_call_function_single(remsd
->cpu
,
3757 static int process_backlog(struct napi_struct
*napi
, int quota
)
3760 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
3763 /* Check if we have pending ipi, its better to send them now,
3764 * not waiting net_rx_action() end.
3766 if (sd
->rps_ipi_list
) {
3767 local_irq_disable();
3768 net_rps_action_and_irq_enable(sd
);
3771 napi
->weight
= weight_p
;
3772 local_irq_disable();
3773 while (work
< quota
) {
3774 struct sk_buff
*skb
;
3777 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
3779 __netif_receive_skb(skb
);
3780 local_irq_disable();
3781 input_queue_head_incr(sd
);
3782 if (++work
>= quota
) {
3789 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3791 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
3792 &sd
->process_queue
);
3794 if (qlen
< quota
- work
) {
3796 * Inline a custom version of __napi_complete().
3797 * only current cpu owns and manipulates this napi,
3798 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3799 * we can use a plain write instead of clear_bit(),
3800 * and we dont need an smp_mb() memory barrier.
3802 list_del(&napi
->poll_list
);
3805 quota
= work
+ qlen
;
3815 * __napi_schedule - schedule for receive
3816 * @n: entry to schedule
3818 * The entry's receive function will be scheduled to run
3820 void __napi_schedule(struct napi_struct
*n
)
3822 unsigned long flags
;
3824 local_irq_save(flags
);
3825 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
3826 local_irq_restore(flags
);
3828 EXPORT_SYMBOL(__napi_schedule
);
3830 void __napi_complete(struct napi_struct
*n
)
3832 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
3833 BUG_ON(n
->gro_list
);
3835 list_del(&n
->poll_list
);
3836 smp_mb__before_clear_bit();
3837 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
3839 EXPORT_SYMBOL(__napi_complete
);
3841 void napi_complete(struct napi_struct
*n
)
3843 unsigned long flags
;
3846 * don't let napi dequeue from the cpu poll list
3847 * just in case its running on a different cpu
3849 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
3853 local_irq_save(flags
);
3855 local_irq_restore(flags
);
3857 EXPORT_SYMBOL(napi_complete
);
3859 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
3860 int (*poll
)(struct napi_struct
*, int), int weight
)
3862 INIT_LIST_HEAD(&napi
->poll_list
);
3863 napi
->gro_count
= 0;
3864 napi
->gro_list
= NULL
;
3867 napi
->weight
= weight
;
3868 list_add(&napi
->dev_list
, &dev
->napi_list
);
3870 #ifdef CONFIG_NETPOLL
3871 spin_lock_init(&napi
->poll_lock
);
3872 napi
->poll_owner
= -1;
3874 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
3876 EXPORT_SYMBOL(netif_napi_add
);
3878 void netif_napi_del(struct napi_struct
*napi
)
3880 struct sk_buff
*skb
, *next
;
3882 list_del_init(&napi
->dev_list
);
3883 napi_free_frags(napi
);
3885 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
3891 napi
->gro_list
= NULL
;
3892 napi
->gro_count
= 0;
3894 EXPORT_SYMBOL(netif_napi_del
);
3896 static void net_rx_action(struct softirq_action
*h
)
3898 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3899 unsigned long time_limit
= jiffies
+ 2;
3900 int budget
= netdev_budget
;
3903 local_irq_disable();
3905 while (!list_empty(&sd
->poll_list
)) {
3906 struct napi_struct
*n
;
3909 /* If softirq window is exhuasted then punt.
3910 * Allow this to run for 2 jiffies since which will allow
3911 * an average latency of 1.5/HZ.
3913 if (unlikely(budget
<= 0 || time_after(jiffies
, time_limit
)))
3918 /* Even though interrupts have been re-enabled, this
3919 * access is safe because interrupts can only add new
3920 * entries to the tail of this list, and only ->poll()
3921 * calls can remove this head entry from the list.
3923 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
3925 have
= netpoll_poll_lock(n
);
3929 /* This NAPI_STATE_SCHED test is for avoiding a race
3930 * with netpoll's poll_napi(). Only the entity which
3931 * obtains the lock and sees NAPI_STATE_SCHED set will
3932 * actually make the ->poll() call. Therefore we avoid
3933 * accidentally calling ->poll() when NAPI is not scheduled.
3936 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
3937 work
= n
->poll(n
, weight
);
3941 WARN_ON_ONCE(work
> weight
);
3945 local_irq_disable();
3947 /* Drivers must not modify the NAPI state if they
3948 * consume the entire weight. In such cases this code
3949 * still "owns" the NAPI instance and therefore can
3950 * move the instance around on the list at-will.
3952 if (unlikely(work
== weight
)) {
3953 if (unlikely(napi_disable_pending(n
))) {
3956 local_irq_disable();
3958 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
3961 netpoll_poll_unlock(have
);
3964 net_rps_action_and_irq_enable(sd
);
3966 #ifdef CONFIG_NET_DMA
3968 * There may not be any more sk_buffs coming right now, so push
3969 * any pending DMA copies to hardware
3971 dma_issue_pending_all();
3978 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3982 static gifconf_func_t
*gifconf_list
[NPROTO
];
3985 * register_gifconf - register a SIOCGIF handler
3986 * @family: Address family
3987 * @gifconf: Function handler
3989 * Register protocol dependent address dumping routines. The handler
3990 * that is passed must not be freed or reused until it has been replaced
3991 * by another handler.
3993 int register_gifconf(unsigned int family
, gifconf_func_t
*gifconf
)
3995 if (family
>= NPROTO
)
3997 gifconf_list
[family
] = gifconf
;
4000 EXPORT_SYMBOL(register_gifconf
);
4004 * Map an interface index to its name (SIOCGIFNAME)
4008 * We need this ioctl for efficient implementation of the
4009 * if_indextoname() function required by the IPv6 API. Without
4010 * it, we would have to search all the interfaces to find a
4014 static int dev_ifname(struct net
*net
, struct ifreq __user
*arg
)
4016 struct net_device
*dev
;
4020 * Fetch the caller's info block.
4023 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
4027 dev
= dev_get_by_index_rcu(net
, ifr
.ifr_ifindex
);
4033 strcpy(ifr
.ifr_name
, dev
->name
);
4036 if (copy_to_user(arg
, &ifr
, sizeof(struct ifreq
)))
4042 * Perform a SIOCGIFCONF call. This structure will change
4043 * size eventually, and there is nothing I can do about it.
4044 * Thus we will need a 'compatibility mode'.
4047 static int dev_ifconf(struct net
*net
, char __user
*arg
)
4050 struct net_device
*dev
;
4057 * Fetch the caller's info block.
4060 if (copy_from_user(&ifc
, arg
, sizeof(struct ifconf
)))
4067 * Loop over the interfaces, and write an info block for each.
4071 for_each_netdev(net
, dev
) {
4072 for (i
= 0; i
< NPROTO
; i
++) {
4073 if (gifconf_list
[i
]) {
4076 done
= gifconf_list
[i
](dev
, NULL
, 0);
4078 done
= gifconf_list
[i
](dev
, pos
+ total
,
4088 * All done. Write the updated control block back to the caller.
4090 ifc
.ifc_len
= total
;
4093 * Both BSD and Solaris return 0 here, so we do too.
4095 return copy_to_user(arg
, &ifc
, sizeof(struct ifconf
)) ? -EFAULT
: 0;
4098 #ifdef CONFIG_PROC_FS
4100 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4102 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4103 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4104 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4106 static inline struct net_device
*dev_from_same_bucket(struct seq_file
*seq
, loff_t
*pos
)
4108 struct net
*net
= seq_file_net(seq
);
4109 struct net_device
*dev
;
4110 struct hlist_node
*p
;
4111 struct hlist_head
*h
;
4112 unsigned int count
= 0, offset
= get_offset(*pos
);
4114 h
= &net
->dev_name_head
[get_bucket(*pos
)];
4115 hlist_for_each_entry_rcu(dev
, p
, h
, name_hlist
) {
4116 if (++count
== offset
)
4123 static inline struct net_device
*dev_from_bucket(struct seq_file
*seq
, loff_t
*pos
)
4125 struct net_device
*dev
;
4126 unsigned int bucket
;
4129 dev
= dev_from_same_bucket(seq
, pos
);
4133 bucket
= get_bucket(*pos
) + 1;
4134 *pos
= set_bucket_offset(bucket
, 1);
4135 } while (bucket
< NETDEV_HASHENTRIES
);
4141 * This is invoked by the /proc filesystem handler to display a device
4144 void *dev_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4149 return SEQ_START_TOKEN
;
4151 if (get_bucket(*pos
) >= NETDEV_HASHENTRIES
)
4154 return dev_from_bucket(seq
, pos
);
4157 void *dev_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4160 return dev_from_bucket(seq
, pos
);
4163 void dev_seq_stop(struct seq_file
*seq
, void *v
)
4169 static void dev_seq_printf_stats(struct seq_file
*seq
, struct net_device
*dev
)
4171 struct rtnl_link_stats64 temp
;
4172 const struct rtnl_link_stats64
*stats
= dev_get_stats(dev
, &temp
);
4174 seq_printf(seq
, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4175 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4176 dev
->name
, stats
->rx_bytes
, stats
->rx_packets
,
4178 stats
->rx_dropped
+ stats
->rx_missed_errors
,
4179 stats
->rx_fifo_errors
,
4180 stats
->rx_length_errors
+ stats
->rx_over_errors
+
4181 stats
->rx_crc_errors
+ stats
->rx_frame_errors
,
4182 stats
->rx_compressed
, stats
->multicast
,
4183 stats
->tx_bytes
, stats
->tx_packets
,
4184 stats
->tx_errors
, stats
->tx_dropped
,
4185 stats
->tx_fifo_errors
, stats
->collisions
,
4186 stats
->tx_carrier_errors
+
4187 stats
->tx_aborted_errors
+
4188 stats
->tx_window_errors
+
4189 stats
->tx_heartbeat_errors
,
4190 stats
->tx_compressed
);
4194 * Called from the PROCfs module. This now uses the new arbitrary sized
4195 * /proc/net interface to create /proc/net/dev
4197 static int dev_seq_show(struct seq_file
*seq
, void *v
)
4199 if (v
== SEQ_START_TOKEN
)
4200 seq_puts(seq
, "Inter-| Receive "
4202 " face |bytes packets errs drop fifo frame "
4203 "compressed multicast|bytes packets errs "
4204 "drop fifo colls carrier compressed\n");
4206 dev_seq_printf_stats(seq
, v
);
4210 static struct softnet_data
*softnet_get_online(loff_t
*pos
)
4212 struct softnet_data
*sd
= NULL
;
4214 while (*pos
< nr_cpu_ids
)
4215 if (cpu_online(*pos
)) {
4216 sd
= &per_cpu(softnet_data
, *pos
);
4223 static void *softnet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4225 return softnet_get_online(pos
);
4228 static void *softnet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4231 return softnet_get_online(pos
);
4234 static void softnet_seq_stop(struct seq_file
*seq
, void *v
)
4238 static int softnet_seq_show(struct seq_file
*seq
, void *v
)
4240 struct softnet_data
*sd
= v
;
4242 seq_printf(seq
, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4243 sd
->processed
, sd
->dropped
, sd
->time_squeeze
, 0,
4244 0, 0, 0, 0, /* was fastroute */
4245 sd
->cpu_collision
, sd
->received_rps
);
4249 static const struct seq_operations dev_seq_ops
= {
4250 .start
= dev_seq_start
,
4251 .next
= dev_seq_next
,
4252 .stop
= dev_seq_stop
,
4253 .show
= dev_seq_show
,
4256 static int dev_seq_open(struct inode
*inode
, struct file
*file
)
4258 return seq_open_net(inode
, file
, &dev_seq_ops
,
4259 sizeof(struct seq_net_private
));
4262 static const struct file_operations dev_seq_fops
= {
4263 .owner
= THIS_MODULE
,
4264 .open
= dev_seq_open
,
4266 .llseek
= seq_lseek
,
4267 .release
= seq_release_net
,
4270 static const struct seq_operations softnet_seq_ops
= {
4271 .start
= softnet_seq_start
,
4272 .next
= softnet_seq_next
,
4273 .stop
= softnet_seq_stop
,
4274 .show
= softnet_seq_show
,
4277 static int softnet_seq_open(struct inode
*inode
, struct file
*file
)
4279 return seq_open(file
, &softnet_seq_ops
);
4282 static const struct file_operations softnet_seq_fops
= {
4283 .owner
= THIS_MODULE
,
4284 .open
= softnet_seq_open
,
4286 .llseek
= seq_lseek
,
4287 .release
= seq_release
,
4290 static void *ptype_get_idx(loff_t pos
)
4292 struct packet_type
*pt
= NULL
;
4296 list_for_each_entry_rcu(pt
, &ptype_all
, list
) {
4302 for (t
= 0; t
< PTYPE_HASH_SIZE
; t
++) {
4303 list_for_each_entry_rcu(pt
, &ptype_base
[t
], list
) {
4312 static void *ptype_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4316 return *pos
? ptype_get_idx(*pos
- 1) : SEQ_START_TOKEN
;
4319 static void *ptype_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4321 struct packet_type
*pt
;
4322 struct list_head
*nxt
;
4326 if (v
== SEQ_START_TOKEN
)
4327 return ptype_get_idx(0);
4330 nxt
= pt
->list
.next
;
4331 if (pt
->type
== htons(ETH_P_ALL
)) {
4332 if (nxt
!= &ptype_all
)
4335 nxt
= ptype_base
[0].next
;
4337 hash
= ntohs(pt
->type
) & PTYPE_HASH_MASK
;
4339 while (nxt
== &ptype_base
[hash
]) {
4340 if (++hash
>= PTYPE_HASH_SIZE
)
4342 nxt
= ptype_base
[hash
].next
;
4345 return list_entry(nxt
, struct packet_type
, list
);
4348 static void ptype_seq_stop(struct seq_file
*seq
, void *v
)
4354 static int ptype_seq_show(struct seq_file
*seq
, void *v
)
4356 struct packet_type
*pt
= v
;
4358 if (v
== SEQ_START_TOKEN
)
4359 seq_puts(seq
, "Type Device Function\n");
4360 else if (pt
->dev
== NULL
|| dev_net(pt
->dev
) == seq_file_net(seq
)) {
4361 if (pt
->type
== htons(ETH_P_ALL
))
4362 seq_puts(seq
, "ALL ");
4364 seq_printf(seq
, "%04x", ntohs(pt
->type
));
4366 seq_printf(seq
, " %-8s %pF\n",
4367 pt
->dev
? pt
->dev
->name
: "", pt
->func
);
4373 static const struct seq_operations ptype_seq_ops
= {
4374 .start
= ptype_seq_start
,
4375 .next
= ptype_seq_next
,
4376 .stop
= ptype_seq_stop
,
4377 .show
= ptype_seq_show
,
4380 static int ptype_seq_open(struct inode
*inode
, struct file
*file
)
4382 return seq_open_net(inode
, file
, &ptype_seq_ops
,
4383 sizeof(struct seq_net_private
));
4386 static const struct file_operations ptype_seq_fops
= {
4387 .owner
= THIS_MODULE
,
4388 .open
= ptype_seq_open
,
4390 .llseek
= seq_lseek
,
4391 .release
= seq_release_net
,
4395 static int __net_init
dev_proc_net_init(struct net
*net
)
4399 if (!proc_net_fops_create(net
, "dev", S_IRUGO
, &dev_seq_fops
))
4401 if (!proc_net_fops_create(net
, "softnet_stat", S_IRUGO
, &softnet_seq_fops
))
4403 if (!proc_net_fops_create(net
, "ptype", S_IRUGO
, &ptype_seq_fops
))
4406 if (wext_proc_init(net
))
4412 proc_net_remove(net
, "ptype");
4414 proc_net_remove(net
, "softnet_stat");
4416 proc_net_remove(net
, "dev");
4420 static void __net_exit
dev_proc_net_exit(struct net
*net
)
4422 wext_proc_exit(net
);
4424 proc_net_remove(net
, "ptype");
4425 proc_net_remove(net
, "softnet_stat");
4426 proc_net_remove(net
, "dev");
4429 static struct pernet_operations __net_initdata dev_proc_ops
= {
4430 .init
= dev_proc_net_init
,
4431 .exit
= dev_proc_net_exit
,
4434 static int __init
dev_proc_init(void)
4436 return register_pernet_subsys(&dev_proc_ops
);
4439 #define dev_proc_init() 0
4440 #endif /* CONFIG_PROC_FS */
4444 * netdev_set_master - set up master pointer
4445 * @slave: slave device
4446 * @master: new master device
4448 * Changes the master device of the slave. Pass %NULL to break the
4449 * bonding. The caller must hold the RTNL semaphore. On a failure
4450 * a negative errno code is returned. On success the reference counts
4451 * are adjusted and the function returns zero.
4453 int netdev_set_master(struct net_device
*slave
, struct net_device
*master
)
4455 struct net_device
*old
= slave
->master
;
4465 slave
->master
= master
;
4471 EXPORT_SYMBOL(netdev_set_master
);
4474 * netdev_set_bond_master - set up bonding master/slave pair
4475 * @slave: slave device
4476 * @master: new master device
4478 * Changes the master device of the slave. Pass %NULL to break the
4479 * bonding. The caller must hold the RTNL semaphore. On a failure
4480 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4481 * to the routing socket and the function returns zero.
4483 int netdev_set_bond_master(struct net_device
*slave
, struct net_device
*master
)
4489 err
= netdev_set_master(slave
, master
);
4493 slave
->flags
|= IFF_SLAVE
;
4495 slave
->flags
&= ~IFF_SLAVE
;
4497 rtmsg_ifinfo(RTM_NEWLINK
, slave
, IFF_SLAVE
);
4500 EXPORT_SYMBOL(netdev_set_bond_master
);
4502 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
4504 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4506 if ((dev
->flags
& IFF_UP
) && ops
->ndo_change_rx_flags
)
4507 ops
->ndo_change_rx_flags(dev
, flags
);
4510 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
)
4512 unsigned int old_flags
= dev
->flags
;
4518 dev
->flags
|= IFF_PROMISC
;
4519 dev
->promiscuity
+= inc
;
4520 if (dev
->promiscuity
== 0) {
4523 * If inc causes overflow, untouch promisc and return error.
4526 dev
->flags
&= ~IFF_PROMISC
;
4528 dev
->promiscuity
-= inc
;
4529 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
4534 if (dev
->flags
!= old_flags
) {
4535 pr_info("device %s %s promiscuous mode\n",
4537 dev
->flags
& IFF_PROMISC
? "entered" : "left");
4538 if (audit_enabled
) {
4539 current_uid_gid(&uid
, &gid
);
4540 audit_log(current
->audit_context
, GFP_ATOMIC
,
4541 AUDIT_ANOM_PROMISCUOUS
,
4542 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4543 dev
->name
, (dev
->flags
& IFF_PROMISC
),
4544 (old_flags
& IFF_PROMISC
),
4545 audit_get_loginuid(current
),
4547 audit_get_sessionid(current
));
4550 dev_change_rx_flags(dev
, IFF_PROMISC
);
4556 * dev_set_promiscuity - update promiscuity count on a device
4560 * Add or remove promiscuity from a device. While the count in the device
4561 * remains above zero the interface remains promiscuous. Once it hits zero
4562 * the device reverts back to normal filtering operation. A negative inc
4563 * value is used to drop promiscuity on the device.
4564 * Return 0 if successful or a negative errno code on error.
4566 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
4568 unsigned int old_flags
= dev
->flags
;
4571 err
= __dev_set_promiscuity(dev
, inc
);
4574 if (dev
->flags
!= old_flags
)
4575 dev_set_rx_mode(dev
);
4578 EXPORT_SYMBOL(dev_set_promiscuity
);
4581 * dev_set_allmulti - update allmulti count on a device
4585 * Add or remove reception of all multicast frames to a device. While the
4586 * count in the device remains above zero the interface remains listening
4587 * to all interfaces. Once it hits zero the device reverts back to normal
4588 * filtering operation. A negative @inc value is used to drop the counter
4589 * when releasing a resource needing all multicasts.
4590 * Return 0 if successful or a negative errno code on error.
4593 int dev_set_allmulti(struct net_device
*dev
, int inc
)
4595 unsigned int old_flags
= dev
->flags
;
4599 dev
->flags
|= IFF_ALLMULTI
;
4600 dev
->allmulti
+= inc
;
4601 if (dev
->allmulti
== 0) {
4604 * If inc causes overflow, untouch allmulti and return error.
4607 dev
->flags
&= ~IFF_ALLMULTI
;
4609 dev
->allmulti
-= inc
;
4610 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
4615 if (dev
->flags
^ old_flags
) {
4616 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
4617 dev_set_rx_mode(dev
);
4621 EXPORT_SYMBOL(dev_set_allmulti
);
4624 * Upload unicast and multicast address lists to device and
4625 * configure RX filtering. When the device doesn't support unicast
4626 * filtering it is put in promiscuous mode while unicast addresses
4629 void __dev_set_rx_mode(struct net_device
*dev
)
4631 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4633 /* dev_open will call this function so the list will stay sane. */
4634 if (!(dev
->flags
&IFF_UP
))
4637 if (!netif_device_present(dev
))
4640 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
4641 /* Unicast addresses changes may only happen under the rtnl,
4642 * therefore calling __dev_set_promiscuity here is safe.
4644 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
4645 __dev_set_promiscuity(dev
, 1);
4646 dev
->uc_promisc
= true;
4647 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
4648 __dev_set_promiscuity(dev
, -1);
4649 dev
->uc_promisc
= false;
4653 if (ops
->ndo_set_rx_mode
)
4654 ops
->ndo_set_rx_mode(dev
);
4657 void dev_set_rx_mode(struct net_device
*dev
)
4659 netif_addr_lock_bh(dev
);
4660 __dev_set_rx_mode(dev
);
4661 netif_addr_unlock_bh(dev
);
4665 * dev_get_flags - get flags reported to userspace
4668 * Get the combination of flag bits exported through APIs to userspace.
4670 unsigned int dev_get_flags(const struct net_device
*dev
)
4674 flags
= (dev
->flags
& ~(IFF_PROMISC
|
4679 (dev
->gflags
& (IFF_PROMISC
|
4682 if (netif_running(dev
)) {
4683 if (netif_oper_up(dev
))
4684 flags
|= IFF_RUNNING
;
4685 if (netif_carrier_ok(dev
))
4686 flags
|= IFF_LOWER_UP
;
4687 if (netif_dormant(dev
))
4688 flags
|= IFF_DORMANT
;
4693 EXPORT_SYMBOL(dev_get_flags
);
4695 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4697 unsigned int old_flags
= dev
->flags
;
4703 * Set the flags on our device.
4706 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
4707 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
4709 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
4713 * Load in the correct multicast list now the flags have changed.
4716 if ((old_flags
^ flags
) & IFF_MULTICAST
)
4717 dev_change_rx_flags(dev
, IFF_MULTICAST
);
4719 dev_set_rx_mode(dev
);
4722 * Have we downed the interface. We handle IFF_UP ourselves
4723 * according to user attempts to set it, rather than blindly
4728 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
4729 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
4732 dev_set_rx_mode(dev
);
4735 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
4736 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
4738 dev
->gflags
^= IFF_PROMISC
;
4739 dev_set_promiscuity(dev
, inc
);
4742 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4743 is important. Some (broken) drivers set IFF_PROMISC, when
4744 IFF_ALLMULTI is requested not asking us and not reporting.
4746 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
4747 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
4749 dev
->gflags
^= IFF_ALLMULTI
;
4750 dev_set_allmulti(dev
, inc
);
4756 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
)
4758 unsigned int changes
= dev
->flags
^ old_flags
;
4760 if (changes
& IFF_UP
) {
4761 if (dev
->flags
& IFF_UP
)
4762 call_netdevice_notifiers(NETDEV_UP
, dev
);
4764 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
4767 if (dev
->flags
& IFF_UP
&&
4768 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
)))
4769 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
4773 * dev_change_flags - change device settings
4775 * @flags: device state flags
4777 * Change settings on device based state flags. The flags are
4778 * in the userspace exported format.
4780 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4783 unsigned int changes
, old_flags
= dev
->flags
;
4785 ret
= __dev_change_flags(dev
, flags
);
4789 changes
= old_flags
^ dev
->flags
;
4791 rtmsg_ifinfo(RTM_NEWLINK
, dev
, changes
);
4793 __dev_notify_flags(dev
, old_flags
);
4796 EXPORT_SYMBOL(dev_change_flags
);
4799 * dev_set_mtu - Change maximum transfer unit
4801 * @new_mtu: new transfer unit
4803 * Change the maximum transfer size of the network device.
4805 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
4807 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4810 if (new_mtu
== dev
->mtu
)
4813 /* MTU must be positive. */
4817 if (!netif_device_present(dev
))
4821 if (ops
->ndo_change_mtu
)
4822 err
= ops
->ndo_change_mtu(dev
, new_mtu
);
4826 if (!err
&& dev
->flags
& IFF_UP
)
4827 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
4830 EXPORT_SYMBOL(dev_set_mtu
);
4833 * dev_set_group - Change group this device belongs to
4835 * @new_group: group this device should belong to
4837 void dev_set_group(struct net_device
*dev
, int new_group
)
4839 dev
->group
= new_group
;
4841 EXPORT_SYMBOL(dev_set_group
);
4844 * dev_set_mac_address - Change Media Access Control Address
4848 * Change the hardware (MAC) address of the device
4850 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
4852 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4855 if (!ops
->ndo_set_mac_address
)
4857 if (sa
->sa_family
!= dev
->type
)
4859 if (!netif_device_present(dev
))
4861 err
= ops
->ndo_set_mac_address(dev
, sa
);
4863 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4864 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
4867 EXPORT_SYMBOL(dev_set_mac_address
);
4870 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4872 static int dev_ifsioc_locked(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4875 struct net_device
*dev
= dev_get_by_name_rcu(net
, ifr
->ifr_name
);
4881 case SIOCGIFFLAGS
: /* Get interface flags */
4882 ifr
->ifr_flags
= (short) dev_get_flags(dev
);
4885 case SIOCGIFMETRIC
: /* Get the metric on the interface
4886 (currently unused) */
4887 ifr
->ifr_metric
= 0;
4890 case SIOCGIFMTU
: /* Get the MTU of a device */
4891 ifr
->ifr_mtu
= dev
->mtu
;
4896 memset(ifr
->ifr_hwaddr
.sa_data
, 0, sizeof ifr
->ifr_hwaddr
.sa_data
);
4898 memcpy(ifr
->ifr_hwaddr
.sa_data
, dev
->dev_addr
,
4899 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
4900 ifr
->ifr_hwaddr
.sa_family
= dev
->type
;
4908 ifr
->ifr_map
.mem_start
= dev
->mem_start
;
4909 ifr
->ifr_map
.mem_end
= dev
->mem_end
;
4910 ifr
->ifr_map
.base_addr
= dev
->base_addr
;
4911 ifr
->ifr_map
.irq
= dev
->irq
;
4912 ifr
->ifr_map
.dma
= dev
->dma
;
4913 ifr
->ifr_map
.port
= dev
->if_port
;
4917 ifr
->ifr_ifindex
= dev
->ifindex
;
4921 ifr
->ifr_qlen
= dev
->tx_queue_len
;
4925 /* dev_ioctl() should ensure this case
4937 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4939 static int dev_ifsioc(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4942 struct net_device
*dev
= __dev_get_by_name(net
, ifr
->ifr_name
);
4943 const struct net_device_ops
*ops
;
4948 ops
= dev
->netdev_ops
;
4951 case SIOCSIFFLAGS
: /* Set interface flags */
4952 return dev_change_flags(dev
, ifr
->ifr_flags
);
4954 case SIOCSIFMETRIC
: /* Set the metric on the interface
4955 (currently unused) */
4958 case SIOCSIFMTU
: /* Set the MTU of a device */
4959 return dev_set_mtu(dev
, ifr
->ifr_mtu
);
4962 return dev_set_mac_address(dev
, &ifr
->ifr_hwaddr
);
4964 case SIOCSIFHWBROADCAST
:
4965 if (ifr
->ifr_hwaddr
.sa_family
!= dev
->type
)
4967 memcpy(dev
->broadcast
, ifr
->ifr_hwaddr
.sa_data
,
4968 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
4969 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4973 if (ops
->ndo_set_config
) {
4974 if (!netif_device_present(dev
))
4976 return ops
->ndo_set_config(dev
, &ifr
->ifr_map
);
4981 if (!ops
->ndo_set_rx_mode
||
4982 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
4984 if (!netif_device_present(dev
))
4986 return dev_mc_add_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
4989 if (!ops
->ndo_set_rx_mode
||
4990 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
4992 if (!netif_device_present(dev
))
4994 return dev_mc_del_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
4997 if (ifr
->ifr_qlen
< 0)
4999 dev
->tx_queue_len
= ifr
->ifr_qlen
;
5003 ifr
->ifr_newname
[IFNAMSIZ
-1] = '\0';
5004 return dev_change_name(dev
, ifr
->ifr_newname
);
5007 err
= net_hwtstamp_validate(ifr
);
5013 * Unknown or private ioctl
5016 if ((cmd
>= SIOCDEVPRIVATE
&&
5017 cmd
<= SIOCDEVPRIVATE
+ 15) ||
5018 cmd
== SIOCBONDENSLAVE
||
5019 cmd
== SIOCBONDRELEASE
||
5020 cmd
== SIOCBONDSETHWADDR
||
5021 cmd
== SIOCBONDSLAVEINFOQUERY
||
5022 cmd
== SIOCBONDINFOQUERY
||
5023 cmd
== SIOCBONDCHANGEACTIVE
||
5024 cmd
== SIOCGMIIPHY
||
5025 cmd
== SIOCGMIIREG
||
5026 cmd
== SIOCSMIIREG
||
5027 cmd
== SIOCBRADDIF
||
5028 cmd
== SIOCBRDELIF
||
5029 cmd
== SIOCSHWTSTAMP
||
5030 cmd
== SIOCWANDEV
) {
5032 if (ops
->ndo_do_ioctl
) {
5033 if (netif_device_present(dev
))
5034 err
= ops
->ndo_do_ioctl(dev
, ifr
, cmd
);
5046 * This function handles all "interface"-type I/O control requests. The actual
5047 * 'doing' part of this is dev_ifsioc above.
5051 * dev_ioctl - network device ioctl
5052 * @net: the applicable net namespace
5053 * @cmd: command to issue
5054 * @arg: pointer to a struct ifreq in user space
5056 * Issue ioctl functions to devices. This is normally called by the
5057 * user space syscall interfaces but can sometimes be useful for
5058 * other purposes. The return value is the return from the syscall if
5059 * positive or a negative errno code on error.
5062 int dev_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
5068 /* One special case: SIOCGIFCONF takes ifconf argument
5069 and requires shared lock, because it sleeps writing
5073 if (cmd
== SIOCGIFCONF
) {
5075 ret
= dev_ifconf(net
, (char __user
*) arg
);
5079 if (cmd
== SIOCGIFNAME
)
5080 return dev_ifname(net
, (struct ifreq __user
*)arg
);
5082 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
5085 ifr
.ifr_name
[IFNAMSIZ
-1] = 0;
5087 colon
= strchr(ifr
.ifr_name
, ':');
5092 * See which interface the caller is talking about.
5097 * These ioctl calls:
5098 * - can be done by all.
5099 * - atomic and do not require locking.
5110 dev_load(net
, ifr
.ifr_name
);
5112 ret
= dev_ifsioc_locked(net
, &ifr
, cmd
);
5117 if (copy_to_user(arg
, &ifr
,
5118 sizeof(struct ifreq
)))
5124 dev_load(net
, ifr
.ifr_name
);
5126 ret
= dev_ethtool(net
, &ifr
);
5131 if (copy_to_user(arg
, &ifr
,
5132 sizeof(struct ifreq
)))
5138 * These ioctl calls:
5139 * - require superuser power.
5140 * - require strict serialization.
5146 if (!capable(CAP_NET_ADMIN
))
5148 dev_load(net
, ifr
.ifr_name
);
5150 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5155 if (copy_to_user(arg
, &ifr
,
5156 sizeof(struct ifreq
)))
5162 * These ioctl calls:
5163 * - require superuser power.
5164 * - require strict serialization.
5165 * - do not return a value
5175 case SIOCSIFHWBROADCAST
:
5178 case SIOCBONDENSLAVE
:
5179 case SIOCBONDRELEASE
:
5180 case SIOCBONDSETHWADDR
:
5181 case SIOCBONDCHANGEACTIVE
:
5185 if (!capable(CAP_NET_ADMIN
))
5188 case SIOCBONDSLAVEINFOQUERY
:
5189 case SIOCBONDINFOQUERY
:
5190 dev_load(net
, ifr
.ifr_name
);
5192 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5197 /* Get the per device memory space. We can add this but
5198 * currently do not support it */
5200 /* Set the per device memory buffer space.
5201 * Not applicable in our case */
5206 * Unknown or private ioctl.
5209 if (cmd
== SIOCWANDEV
||
5210 (cmd
>= SIOCDEVPRIVATE
&&
5211 cmd
<= SIOCDEVPRIVATE
+ 15)) {
5212 dev_load(net
, ifr
.ifr_name
);
5214 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5216 if (!ret
&& copy_to_user(arg
, &ifr
,
5217 sizeof(struct ifreq
)))
5221 /* Take care of Wireless Extensions */
5222 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
)
5223 return wext_handle_ioctl(net
, &ifr
, cmd
, arg
);
5230 * dev_new_index - allocate an ifindex
5231 * @net: the applicable net namespace
5233 * Returns a suitable unique value for a new device interface
5234 * number. The caller must hold the rtnl semaphore or the
5235 * dev_base_lock to be sure it remains unique.
5237 static int dev_new_index(struct net
*net
)
5243 if (!__dev_get_by_index(net
, ifindex
))
5248 /* Delayed registration/unregisteration */
5249 static LIST_HEAD(net_todo_list
);
5251 static void net_set_todo(struct net_device
*dev
)
5253 list_add_tail(&dev
->todo_list
, &net_todo_list
);
5256 static void rollback_registered_many(struct list_head
*head
)
5258 struct net_device
*dev
, *tmp
;
5260 BUG_ON(dev_boot_phase
);
5263 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
5264 /* Some devices call without registering
5265 * for initialization unwind. Remove those
5266 * devices and proceed with the remaining.
5268 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5269 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5273 list_del(&dev
->unreg_list
);
5276 dev
->dismantle
= true;
5277 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
5280 /* If device is running, close it first. */
5281 dev_close_many(head
);
5283 list_for_each_entry(dev
, head
, unreg_list
) {
5284 /* And unlink it from device chain. */
5285 unlist_netdevice(dev
);
5287 dev
->reg_state
= NETREG_UNREGISTERING
;
5292 list_for_each_entry(dev
, head
, unreg_list
) {
5293 /* Shutdown queueing discipline. */
5297 /* Notify protocols, that we are about to destroy
5298 this device. They should clean all the things.
5300 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5302 if (!dev
->rtnl_link_ops
||
5303 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5304 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
5307 * Flush the unicast and multicast chains
5312 if (dev
->netdev_ops
->ndo_uninit
)
5313 dev
->netdev_ops
->ndo_uninit(dev
);
5315 /* Notifier chain MUST detach us from master device. */
5316 WARN_ON(dev
->master
);
5318 /* Remove entries from kobject tree */
5319 netdev_unregister_kobject(dev
);
5322 /* Process any work delayed until the end of the batch */
5323 dev
= list_first_entry(head
, struct net_device
, unreg_list
);
5324 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH
, dev
);
5328 list_for_each_entry(dev
, head
, unreg_list
)
5332 static void rollback_registered(struct net_device
*dev
)
5336 list_add(&dev
->unreg_list
, &single
);
5337 rollback_registered_many(&single
);
5341 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
5342 netdev_features_t features
)
5344 /* Fix illegal checksum combinations */
5345 if ((features
& NETIF_F_HW_CSUM
) &&
5346 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5347 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
5348 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
5351 /* Fix illegal SG+CSUM combinations. */
5352 if ((features
& NETIF_F_SG
) &&
5353 !(features
& NETIF_F_ALL_CSUM
)) {
5355 "Dropping NETIF_F_SG since no checksum feature.\n");
5356 features
&= ~NETIF_F_SG
;
5359 /* TSO requires that SG is present as well. */
5360 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
5361 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
5362 features
&= ~NETIF_F_ALL_TSO
;
5365 /* TSO ECN requires that TSO is present as well. */
5366 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
5367 features
&= ~NETIF_F_TSO_ECN
;
5369 /* Software GSO depends on SG. */
5370 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
5371 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
5372 features
&= ~NETIF_F_GSO
;
5375 /* UFO needs SG and checksumming */
5376 if (features
& NETIF_F_UFO
) {
5377 /* maybe split UFO into V4 and V6? */
5378 if (!((features
& NETIF_F_GEN_CSUM
) ||
5379 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
5380 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5382 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5383 features
&= ~NETIF_F_UFO
;
5386 if (!(features
& NETIF_F_SG
)) {
5388 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5389 features
&= ~NETIF_F_UFO
;
5396 int __netdev_update_features(struct net_device
*dev
)
5398 netdev_features_t features
;
5403 features
= netdev_get_wanted_features(dev
);
5405 if (dev
->netdev_ops
->ndo_fix_features
)
5406 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
5408 /* driver might be less strict about feature dependencies */
5409 features
= netdev_fix_features(dev
, features
);
5411 if (dev
->features
== features
)
5414 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
5415 &dev
->features
, &features
);
5417 if (dev
->netdev_ops
->ndo_set_features
)
5418 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
5420 if (unlikely(err
< 0)) {
5422 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5423 err
, &features
, &dev
->features
);
5428 dev
->features
= features
;
5434 * netdev_update_features - recalculate device features
5435 * @dev: the device to check
5437 * Recalculate dev->features set and send notifications if it
5438 * has changed. Should be called after driver or hardware dependent
5439 * conditions might have changed that influence the features.
5441 void netdev_update_features(struct net_device
*dev
)
5443 if (__netdev_update_features(dev
))
5444 netdev_features_change(dev
);
5446 EXPORT_SYMBOL(netdev_update_features
);
5449 * netdev_change_features - recalculate device features
5450 * @dev: the device to check
5452 * Recalculate dev->features set and send notifications even
5453 * if they have not changed. Should be called instead of
5454 * netdev_update_features() if also dev->vlan_features might
5455 * have changed to allow the changes to be propagated to stacked
5458 void netdev_change_features(struct net_device
*dev
)
5460 __netdev_update_features(dev
);
5461 netdev_features_change(dev
);
5463 EXPORT_SYMBOL(netdev_change_features
);
5466 * netif_stacked_transfer_operstate - transfer operstate
5467 * @rootdev: the root or lower level device to transfer state from
5468 * @dev: the device to transfer operstate to
5470 * Transfer operational state from root to device. This is normally
5471 * called when a stacking relationship exists between the root
5472 * device and the device(a leaf device).
5474 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
5475 struct net_device
*dev
)
5477 if (rootdev
->operstate
== IF_OPER_DORMANT
)
5478 netif_dormant_on(dev
);
5480 netif_dormant_off(dev
);
5482 if (netif_carrier_ok(rootdev
)) {
5483 if (!netif_carrier_ok(dev
))
5484 netif_carrier_on(dev
);
5486 if (netif_carrier_ok(dev
))
5487 netif_carrier_off(dev
);
5490 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
5493 static int netif_alloc_rx_queues(struct net_device
*dev
)
5495 unsigned int i
, count
= dev
->num_rx_queues
;
5496 struct netdev_rx_queue
*rx
;
5500 rx
= kcalloc(count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5502 pr_err("netdev: Unable to allocate %u rx queues\n", count
);
5507 for (i
= 0; i
< count
; i
++)
5513 static void netdev_init_one_queue(struct net_device
*dev
,
5514 struct netdev_queue
*queue
, void *_unused
)
5516 /* Initialize queue lock */
5517 spin_lock_init(&queue
->_xmit_lock
);
5518 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
5519 queue
->xmit_lock_owner
= -1;
5520 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
5523 dql_init(&queue
->dql
, HZ
);
5527 static int netif_alloc_netdev_queues(struct net_device
*dev
)
5529 unsigned int count
= dev
->num_tx_queues
;
5530 struct netdev_queue
*tx
;
5534 tx
= kcalloc(count
, sizeof(struct netdev_queue
), GFP_KERNEL
);
5536 pr_err("netdev: Unable to allocate %u tx queues\n", count
);
5541 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
5542 spin_lock_init(&dev
->tx_global_lock
);
5548 * register_netdevice - register a network device
5549 * @dev: device to register
5551 * Take a completed network device structure and add it to the kernel
5552 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5553 * chain. 0 is returned on success. A negative errno code is returned
5554 * on a failure to set up the device, or if the name is a duplicate.
5556 * Callers must hold the rtnl semaphore. You may want
5557 * register_netdev() instead of this.
5560 * The locking appears insufficient to guarantee two parallel registers
5561 * will not get the same name.
5564 int register_netdevice(struct net_device
*dev
)
5567 struct net
*net
= dev_net(dev
);
5569 BUG_ON(dev_boot_phase
);
5574 /* When net_device's are persistent, this will be fatal. */
5575 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
5578 spin_lock_init(&dev
->addr_list_lock
);
5579 netdev_set_addr_lockdep_class(dev
);
5583 ret
= dev_get_valid_name(dev
, dev
->name
);
5587 /* Init, if this function is available */
5588 if (dev
->netdev_ops
->ndo_init
) {
5589 ret
= dev
->netdev_ops
->ndo_init(dev
);
5597 dev
->ifindex
= dev_new_index(net
);
5598 if (dev
->iflink
== -1)
5599 dev
->iflink
= dev
->ifindex
;
5601 /* Transfer changeable features to wanted_features and enable
5602 * software offloads (GSO and GRO).
5604 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
5605 dev
->features
|= NETIF_F_SOFT_FEATURES
;
5606 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
5608 /* Turn on no cache copy if HW is doing checksum */
5609 if (!(dev
->flags
& IFF_LOOPBACK
)) {
5610 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
5611 if (dev
->features
& NETIF_F_ALL_CSUM
) {
5612 dev
->wanted_features
|= NETIF_F_NOCACHE_COPY
;
5613 dev
->features
|= NETIF_F_NOCACHE_COPY
;
5617 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5619 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
5621 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
5622 ret
= notifier_to_errno(ret
);
5626 ret
= netdev_register_kobject(dev
);
5629 dev
->reg_state
= NETREG_REGISTERED
;
5631 __netdev_update_features(dev
);
5634 * Default initial state at registry is that the
5635 * device is present.
5638 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5640 dev_init_scheduler(dev
);
5642 list_netdevice(dev
);
5643 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5645 /* Notify protocols, that a new device appeared. */
5646 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5647 ret
= notifier_to_errno(ret
);
5649 rollback_registered(dev
);
5650 dev
->reg_state
= NETREG_UNREGISTERED
;
5653 * Prevent userspace races by waiting until the network
5654 * device is fully setup before sending notifications.
5656 if (!dev
->rtnl_link_ops
||
5657 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5658 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
5664 if (dev
->netdev_ops
->ndo_uninit
)
5665 dev
->netdev_ops
->ndo_uninit(dev
);
5668 EXPORT_SYMBOL(register_netdevice
);
5671 * init_dummy_netdev - init a dummy network device for NAPI
5672 * @dev: device to init
5674 * This takes a network device structure and initialize the minimum
5675 * amount of fields so it can be used to schedule NAPI polls without
5676 * registering a full blown interface. This is to be used by drivers
5677 * that need to tie several hardware interfaces to a single NAPI
5678 * poll scheduler due to HW limitations.
5680 int init_dummy_netdev(struct net_device
*dev
)
5682 /* Clear everything. Note we don't initialize spinlocks
5683 * are they aren't supposed to be taken by any of the
5684 * NAPI code and this dummy netdev is supposed to be
5685 * only ever used for NAPI polls
5687 memset(dev
, 0, sizeof(struct net_device
));
5689 /* make sure we BUG if trying to hit standard
5690 * register/unregister code path
5692 dev
->reg_state
= NETREG_DUMMY
;
5694 /* NAPI wants this */
5695 INIT_LIST_HEAD(&dev
->napi_list
);
5697 /* a dummy interface is started by default */
5698 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5699 set_bit(__LINK_STATE_START
, &dev
->state
);
5701 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5702 * because users of this 'device' dont need to change
5708 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
5712 * register_netdev - register a network device
5713 * @dev: device to register
5715 * Take a completed network device structure and add it to the kernel
5716 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5717 * chain. 0 is returned on success. A negative errno code is returned
5718 * on a failure to set up the device, or if the name is a duplicate.
5720 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5721 * and expands the device name if you passed a format string to
5724 int register_netdev(struct net_device
*dev
)
5729 err
= register_netdevice(dev
);
5733 EXPORT_SYMBOL(register_netdev
);
5735 int netdev_refcnt_read(const struct net_device
*dev
)
5739 for_each_possible_cpu(i
)
5740 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
5743 EXPORT_SYMBOL(netdev_refcnt_read
);
5746 * netdev_wait_allrefs - wait until all references are gone.
5747 * @dev: target net_device
5749 * This is called when unregistering network devices.
5751 * Any protocol or device that holds a reference should register
5752 * for netdevice notification, and cleanup and put back the
5753 * reference if they receive an UNREGISTER event.
5754 * We can get stuck here if buggy protocols don't correctly
5757 static void netdev_wait_allrefs(struct net_device
*dev
)
5759 unsigned long rebroadcast_time
, warning_time
;
5762 linkwatch_forget_dev(dev
);
5764 rebroadcast_time
= warning_time
= jiffies
;
5765 refcnt
= netdev_refcnt_read(dev
);
5767 while (refcnt
!= 0) {
5768 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
5771 /* Rebroadcast unregister notification */
5772 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5773 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5774 * should have already handle it the first time */
5776 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
5778 /* We must not have linkwatch events
5779 * pending on unregister. If this
5780 * happens, we simply run the queue
5781 * unscheduled, resulting in a noop
5784 linkwatch_run_queue();
5789 rebroadcast_time
= jiffies
;
5794 refcnt
= netdev_refcnt_read(dev
);
5796 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
5797 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
5799 warning_time
= jiffies
;
5808 * register_netdevice(x1);
5809 * register_netdevice(x2);
5811 * unregister_netdevice(y1);
5812 * unregister_netdevice(y2);
5818 * We are invoked by rtnl_unlock().
5819 * This allows us to deal with problems:
5820 * 1) We can delete sysfs objects which invoke hotplug
5821 * without deadlocking with linkwatch via keventd.
5822 * 2) Since we run with the RTNL semaphore not held, we can sleep
5823 * safely in order to wait for the netdev refcnt to drop to zero.
5825 * We must not return until all unregister events added during
5826 * the interval the lock was held have been completed.
5828 void netdev_run_todo(void)
5830 struct list_head list
;
5832 /* Snapshot list, allow later requests */
5833 list_replace_init(&net_todo_list
, &list
);
5837 /* Wait for rcu callbacks to finish before attempting to drain
5838 * the device list. This usually avoids a 250ms wait.
5840 if (!list_empty(&list
))
5843 while (!list_empty(&list
)) {
5844 struct net_device
*dev
5845 = list_first_entry(&list
, struct net_device
, todo_list
);
5846 list_del(&dev
->todo_list
);
5848 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
5849 pr_err("network todo '%s' but state %d\n",
5850 dev
->name
, dev
->reg_state
);
5855 dev
->reg_state
= NETREG_UNREGISTERED
;
5857 on_each_cpu(flush_backlog
, dev
, 1);
5859 netdev_wait_allrefs(dev
);
5862 BUG_ON(netdev_refcnt_read(dev
));
5863 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
5864 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
5865 WARN_ON(dev
->dn_ptr
);
5867 if (dev
->destructor
)
5868 dev
->destructor(dev
);
5870 /* Free network device */
5871 kobject_put(&dev
->dev
.kobj
);
5875 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5876 * fields in the same order, with only the type differing.
5878 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
5879 const struct net_device_stats
*netdev_stats
)
5881 #if BITS_PER_LONG == 64
5882 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
5883 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
5885 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
5886 const unsigned long *src
= (const unsigned long *)netdev_stats
;
5887 u64
*dst
= (u64
*)stats64
;
5889 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
5890 sizeof(*stats64
) / sizeof(u64
));
5891 for (i
= 0; i
< n
; i
++)
5895 EXPORT_SYMBOL(netdev_stats_to_stats64
);
5898 * dev_get_stats - get network device statistics
5899 * @dev: device to get statistics from
5900 * @storage: place to store stats
5902 * Get network statistics from device. Return @storage.
5903 * The device driver may provide its own method by setting
5904 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5905 * otherwise the internal statistics structure is used.
5907 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
5908 struct rtnl_link_stats64
*storage
)
5910 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5912 if (ops
->ndo_get_stats64
) {
5913 memset(storage
, 0, sizeof(*storage
));
5914 ops
->ndo_get_stats64(dev
, storage
);
5915 } else if (ops
->ndo_get_stats
) {
5916 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
5918 netdev_stats_to_stats64(storage
, &dev
->stats
);
5920 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
5923 EXPORT_SYMBOL(dev_get_stats
);
5925 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
5927 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
5929 #ifdef CONFIG_NET_CLS_ACT
5932 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
5935 netdev_init_one_queue(dev
, queue
, NULL
);
5936 queue
->qdisc
= &noop_qdisc
;
5937 queue
->qdisc_sleeping
= &noop_qdisc
;
5938 rcu_assign_pointer(dev
->ingress_queue
, queue
);
5944 * alloc_netdev_mqs - allocate network device
5945 * @sizeof_priv: size of private data to allocate space for
5946 * @name: device name format string
5947 * @setup: callback to initialize device
5948 * @txqs: the number of TX subqueues to allocate
5949 * @rxqs: the number of RX subqueues to allocate
5951 * Allocates a struct net_device with private data area for driver use
5952 * and performs basic initialization. Also allocates subquue structs
5953 * for each queue on the device.
5955 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
5956 void (*setup
)(struct net_device
*),
5957 unsigned int txqs
, unsigned int rxqs
)
5959 struct net_device
*dev
;
5961 struct net_device
*p
;
5963 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
5966 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
5972 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
5977 alloc_size
= sizeof(struct net_device
);
5979 /* ensure 32-byte alignment of private area */
5980 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
5981 alloc_size
+= sizeof_priv
;
5983 /* ensure 32-byte alignment of whole construct */
5984 alloc_size
+= NETDEV_ALIGN
- 1;
5986 p
= kzalloc(alloc_size
, GFP_KERNEL
);
5988 pr_err("alloc_netdev: Unable to allocate device\n");
5992 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
5993 dev
->padded
= (char *)dev
- (char *)p
;
5995 dev
->pcpu_refcnt
= alloc_percpu(int);
5996 if (!dev
->pcpu_refcnt
)
5999 if (dev_addr_init(dev
))
6005 dev_net_set(dev
, &init_net
);
6007 dev
->gso_max_size
= GSO_MAX_SIZE
;
6008 dev
->gso_max_segs
= GSO_MAX_SEGS
;
6010 INIT_LIST_HEAD(&dev
->napi_list
);
6011 INIT_LIST_HEAD(&dev
->unreg_list
);
6012 INIT_LIST_HEAD(&dev
->link_watch_list
);
6013 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
6016 dev
->num_tx_queues
= txqs
;
6017 dev
->real_num_tx_queues
= txqs
;
6018 if (netif_alloc_netdev_queues(dev
))
6022 dev
->num_rx_queues
= rxqs
;
6023 dev
->real_num_rx_queues
= rxqs
;
6024 if (netif_alloc_rx_queues(dev
))
6028 strcpy(dev
->name
, name
);
6029 dev
->group
= INIT_NETDEV_GROUP
;
6037 free_percpu(dev
->pcpu_refcnt
);
6047 EXPORT_SYMBOL(alloc_netdev_mqs
);
6050 * free_netdev - free network device
6053 * This function does the last stage of destroying an allocated device
6054 * interface. The reference to the device object is released.
6055 * If this is the last reference then it will be freed.
6057 void free_netdev(struct net_device
*dev
)
6059 struct napi_struct
*p
, *n
;
6061 release_net(dev_net(dev
));
6068 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
6070 /* Flush device addresses */
6071 dev_addr_flush(dev
);
6073 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
6076 free_percpu(dev
->pcpu_refcnt
);
6077 dev
->pcpu_refcnt
= NULL
;
6079 /* Compatibility with error handling in drivers */
6080 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6081 kfree((char *)dev
- dev
->padded
);
6085 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
6086 dev
->reg_state
= NETREG_RELEASED
;
6088 /* will free via device release */
6089 put_device(&dev
->dev
);
6091 EXPORT_SYMBOL(free_netdev
);
6094 * synchronize_net - Synchronize with packet receive processing
6096 * Wait for packets currently being received to be done.
6097 * Does not block later packets from starting.
6099 void synchronize_net(void)
6102 if (rtnl_is_locked())
6103 synchronize_rcu_expedited();
6107 EXPORT_SYMBOL(synchronize_net
);
6110 * unregister_netdevice_queue - remove device from the kernel
6114 * This function shuts down a device interface and removes it
6115 * from the kernel tables.
6116 * If head not NULL, device is queued to be unregistered later.
6118 * Callers must hold the rtnl semaphore. You may want
6119 * unregister_netdev() instead of this.
6122 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
6127 list_move_tail(&dev
->unreg_list
, head
);
6129 rollback_registered(dev
);
6130 /* Finish processing unregister after unlock */
6134 EXPORT_SYMBOL(unregister_netdevice_queue
);
6137 * unregister_netdevice_many - unregister many devices
6138 * @head: list of devices
6140 void unregister_netdevice_many(struct list_head
*head
)
6142 struct net_device
*dev
;
6144 if (!list_empty(head
)) {
6145 rollback_registered_many(head
);
6146 list_for_each_entry(dev
, head
, unreg_list
)
6150 EXPORT_SYMBOL(unregister_netdevice_many
);
6153 * unregister_netdev - remove device from the kernel
6156 * This function shuts down a device interface and removes it
6157 * from the kernel tables.
6159 * This is just a wrapper for unregister_netdevice that takes
6160 * the rtnl semaphore. In general you want to use this and not
6161 * unregister_netdevice.
6163 void unregister_netdev(struct net_device
*dev
)
6166 unregister_netdevice(dev
);
6169 EXPORT_SYMBOL(unregister_netdev
);
6172 * dev_change_net_namespace - move device to different nethost namespace
6174 * @net: network namespace
6175 * @pat: If not NULL name pattern to try if the current device name
6176 * is already taken in the destination network namespace.
6178 * This function shuts down a device interface and moves it
6179 * to a new network namespace. On success 0 is returned, on
6180 * a failure a netagive errno code is returned.
6182 * Callers must hold the rtnl semaphore.
6185 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
6191 /* Don't allow namespace local devices to be moved. */
6193 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6196 /* Ensure the device has been registrered */
6198 if (dev
->reg_state
!= NETREG_REGISTERED
)
6201 /* Get out if there is nothing todo */
6203 if (net_eq(dev_net(dev
), net
))
6206 /* Pick the destination device name, and ensure
6207 * we can use it in the destination network namespace.
6210 if (__dev_get_by_name(net
, dev
->name
)) {
6211 /* We get here if we can't use the current device name */
6214 if (dev_get_valid_name(dev
, pat
) < 0)
6219 * And now a mini version of register_netdevice unregister_netdevice.
6222 /* If device is running close it first. */
6225 /* And unlink it from device chain */
6227 unlist_netdevice(dev
);
6231 /* Shutdown queueing discipline. */
6234 /* Notify protocols, that we are about to destroy
6235 this device. They should clean all the things.
6237 Note that dev->reg_state stays at NETREG_REGISTERED.
6238 This is wanted because this way 8021q and macvlan know
6239 the device is just moving and can keep their slaves up.
6241 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6242 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH
, dev
);
6243 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
6246 * Flush the unicast and multicast chains
6251 /* Actually switch the network namespace */
6252 dev_net_set(dev
, net
);
6254 /* If there is an ifindex conflict assign a new one */
6255 if (__dev_get_by_index(net
, dev
->ifindex
)) {
6256 int iflink
= (dev
->iflink
== dev
->ifindex
);
6257 dev
->ifindex
= dev_new_index(net
);
6259 dev
->iflink
= dev
->ifindex
;
6262 /* Fixup kobjects */
6263 err
= device_rename(&dev
->dev
, dev
->name
);
6266 /* Add the device back in the hashes */
6267 list_netdevice(dev
);
6269 /* Notify protocols, that a new device appeared. */
6270 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6273 * Prevent userspace races by waiting until the network
6274 * device is fully setup before sending notifications.
6276 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
6283 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
6285 static int dev_cpu_callback(struct notifier_block
*nfb
,
6286 unsigned long action
,
6289 struct sk_buff
**list_skb
;
6290 struct sk_buff
*skb
;
6291 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
6292 struct softnet_data
*sd
, *oldsd
;
6294 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
6297 local_irq_disable();
6298 cpu
= smp_processor_id();
6299 sd
= &per_cpu(softnet_data
, cpu
);
6300 oldsd
= &per_cpu(softnet_data
, oldcpu
);
6302 /* Find end of our completion_queue. */
6303 list_skb
= &sd
->completion_queue
;
6305 list_skb
= &(*list_skb
)->next
;
6306 /* Append completion queue from offline CPU. */
6307 *list_skb
= oldsd
->completion_queue
;
6308 oldsd
->completion_queue
= NULL
;
6310 /* Append output queue from offline CPU. */
6311 if (oldsd
->output_queue
) {
6312 *sd
->output_queue_tailp
= oldsd
->output_queue
;
6313 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
6314 oldsd
->output_queue
= NULL
;
6315 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
6317 /* Append NAPI poll list from offline CPU. */
6318 if (!list_empty(&oldsd
->poll_list
)) {
6319 list_splice_init(&oldsd
->poll_list
, &sd
->poll_list
);
6320 raise_softirq_irqoff(NET_RX_SOFTIRQ
);
6323 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
6326 /* Process offline CPU's input_pkt_queue */
6327 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
6329 input_queue_head_incr(oldsd
);
6331 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
6333 input_queue_head_incr(oldsd
);
6341 * netdev_increment_features - increment feature set by one
6342 * @all: current feature set
6343 * @one: new feature set
6344 * @mask: mask feature set
6346 * Computes a new feature set after adding a device with feature set
6347 * @one to the master device with current feature set @all. Will not
6348 * enable anything that is off in @mask. Returns the new feature set.
6350 netdev_features_t
netdev_increment_features(netdev_features_t all
,
6351 netdev_features_t one
, netdev_features_t mask
)
6353 if (mask
& NETIF_F_GEN_CSUM
)
6354 mask
|= NETIF_F_ALL_CSUM
;
6355 mask
|= NETIF_F_VLAN_CHALLENGED
;
6357 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
6358 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
6360 /* If one device supports hw checksumming, set for all. */
6361 if (all
& NETIF_F_GEN_CSUM
)
6362 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
6366 EXPORT_SYMBOL(netdev_increment_features
);
6368 static struct hlist_head
*netdev_create_hash(void)
6371 struct hlist_head
*hash
;
6373 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
6375 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
6376 INIT_HLIST_HEAD(&hash
[i
]);
6381 /* Initialize per network namespace state */
6382 static int __net_init
netdev_init(struct net
*net
)
6384 if (net
!= &init_net
)
6385 INIT_LIST_HEAD(&net
->dev_base_head
);
6387 net
->dev_name_head
= netdev_create_hash();
6388 if (net
->dev_name_head
== NULL
)
6391 net
->dev_index_head
= netdev_create_hash();
6392 if (net
->dev_index_head
== NULL
)
6398 kfree(net
->dev_name_head
);
6404 * netdev_drivername - network driver for the device
6405 * @dev: network device
6407 * Determine network driver for device.
6409 const char *netdev_drivername(const struct net_device
*dev
)
6411 const struct device_driver
*driver
;
6412 const struct device
*parent
;
6413 const char *empty
= "";
6415 parent
= dev
->dev
.parent
;
6419 driver
= parent
->driver
;
6420 if (driver
&& driver
->name
)
6421 return driver
->name
;
6425 int __netdev_printk(const char *level
, const struct net_device
*dev
,
6426 struct va_format
*vaf
)
6430 if (dev
&& dev
->dev
.parent
)
6431 r
= dev_printk(level
, dev
->dev
.parent
, "%s: %pV",
6432 netdev_name(dev
), vaf
);
6434 r
= printk("%s%s: %pV", level
, netdev_name(dev
), vaf
);
6436 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
6440 EXPORT_SYMBOL(__netdev_printk
);
6442 int netdev_printk(const char *level
, const struct net_device
*dev
,
6443 const char *format
, ...)
6445 struct va_format vaf
;
6449 va_start(args
, format
);
6454 r
= __netdev_printk(level
, dev
, &vaf
);
6459 EXPORT_SYMBOL(netdev_printk
);
6461 #define define_netdev_printk_level(func, level) \
6462 int func(const struct net_device *dev, const char *fmt, ...) \
6465 struct va_format vaf; \
6468 va_start(args, fmt); \
6473 r = __netdev_printk(level, dev, &vaf); \
6478 EXPORT_SYMBOL(func);
6480 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
6481 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
6482 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
6483 define_netdev_printk_level(netdev_err
, KERN_ERR
);
6484 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
6485 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
6486 define_netdev_printk_level(netdev_info
, KERN_INFO
);
6488 static void __net_exit
netdev_exit(struct net
*net
)
6490 kfree(net
->dev_name_head
);
6491 kfree(net
->dev_index_head
);
6494 static struct pernet_operations __net_initdata netdev_net_ops
= {
6495 .init
= netdev_init
,
6496 .exit
= netdev_exit
,
6499 static void __net_exit
default_device_exit(struct net
*net
)
6501 struct net_device
*dev
, *aux
;
6503 * Push all migratable network devices back to the
6504 * initial network namespace
6507 for_each_netdev_safe(net
, dev
, aux
) {
6509 char fb_name
[IFNAMSIZ
];
6511 /* Ignore unmoveable devices (i.e. loopback) */
6512 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6515 /* Leave virtual devices for the generic cleanup */
6516 if (dev
->rtnl_link_ops
)
6519 /* Push remaining network devices to init_net */
6520 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
6521 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
6523 pr_emerg("%s: failed to move %s to init_net: %d\n",
6524 __func__
, dev
->name
, err
);
6531 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
6533 /* At exit all network devices most be removed from a network
6534 * namespace. Do this in the reverse order of registration.
6535 * Do this across as many network namespaces as possible to
6536 * improve batching efficiency.
6538 struct net_device
*dev
;
6540 LIST_HEAD(dev_kill_list
);
6543 list_for_each_entry(net
, net_list
, exit_list
) {
6544 for_each_netdev_reverse(net
, dev
) {
6545 if (dev
->rtnl_link_ops
)
6546 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
6548 unregister_netdevice_queue(dev
, &dev_kill_list
);
6551 unregister_netdevice_many(&dev_kill_list
);
6552 list_del(&dev_kill_list
);
6556 static struct pernet_operations __net_initdata default_device_ops
= {
6557 .exit
= default_device_exit
,
6558 .exit_batch
= default_device_exit_batch
,
6562 * Initialize the DEV module. At boot time this walks the device list and
6563 * unhooks any devices that fail to initialise (normally hardware not
6564 * present) and leaves us with a valid list of present and active devices.
6569 * This is called single threaded during boot, so no need
6570 * to take the rtnl semaphore.
6572 static int __init
net_dev_init(void)
6574 int i
, rc
= -ENOMEM
;
6576 BUG_ON(!dev_boot_phase
);
6578 if (dev_proc_init())
6581 if (netdev_kobject_init())
6584 INIT_LIST_HEAD(&ptype_all
);
6585 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
6586 INIT_LIST_HEAD(&ptype_base
[i
]);
6588 if (register_pernet_subsys(&netdev_net_ops
))
6592 * Initialise the packet receive queues.
6595 for_each_possible_cpu(i
) {
6596 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
6598 memset(sd
, 0, sizeof(*sd
));
6599 skb_queue_head_init(&sd
->input_pkt_queue
);
6600 skb_queue_head_init(&sd
->process_queue
);
6601 sd
->completion_queue
= NULL
;
6602 INIT_LIST_HEAD(&sd
->poll_list
);
6603 sd
->output_queue
= NULL
;
6604 sd
->output_queue_tailp
= &sd
->output_queue
;
6606 sd
->csd
.func
= rps_trigger_softirq
;
6612 sd
->backlog
.poll
= process_backlog
;
6613 sd
->backlog
.weight
= weight_p
;
6614 sd
->backlog
.gro_list
= NULL
;
6615 sd
->backlog
.gro_count
= 0;
6620 /* The loopback device is special if any other network devices
6621 * is present in a network namespace the loopback device must
6622 * be present. Since we now dynamically allocate and free the
6623 * loopback device ensure this invariant is maintained by
6624 * keeping the loopback device as the first device on the
6625 * list of network devices. Ensuring the loopback devices
6626 * is the first device that appears and the last network device
6629 if (register_pernet_device(&loopback_net_ops
))
6632 if (register_pernet_device(&default_device_ops
))
6635 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
6636 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
6638 hotcpu_notifier(dev_cpu_callback
, 0);
6646 subsys_initcall(net_dev_init
);
6648 static int __init
initialize_hashrnd(void)
6650 get_random_bytes(&hashrnd
, sizeof(hashrnd
));
6654 late_initcall_sync(initialize_hashrnd
);