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
)
1060 if (len
>= IFALIASZ
)
1065 kfree(dev
->ifalias
);
1066 dev
->ifalias
= NULL
;
1071 dev
->ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1075 strlcpy(dev
->ifalias
, alias
, len
+1);
1081 * netdev_features_change - device changes features
1082 * @dev: device to cause notification
1084 * Called to indicate a device has changed features.
1086 void netdev_features_change(struct net_device
*dev
)
1088 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1090 EXPORT_SYMBOL(netdev_features_change
);
1093 * netdev_state_change - device changes state
1094 * @dev: device to cause notification
1096 * Called to indicate a device has changed state. This function calls
1097 * the notifier chains for netdev_chain and sends a NEWLINK message
1098 * to the routing socket.
1100 void netdev_state_change(struct net_device
*dev
)
1102 if (dev
->flags
& IFF_UP
) {
1103 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
1104 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0);
1107 EXPORT_SYMBOL(netdev_state_change
);
1110 * netdev_notify_peers - notify network peers about existence of @dev
1111 * @dev: network device
1113 * Generate traffic such that interested network peers are aware of
1114 * @dev, such as by generating a gratuitous ARP. This may be used when
1115 * a device wants to inform the rest of the network about some sort of
1116 * reconfiguration such as a failover event or virtual machine
1119 void netdev_notify_peers(struct net_device
*dev
)
1122 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1125 EXPORT_SYMBOL(netdev_notify_peers
);
1128 * dev_load - load a network module
1129 * @net: the applicable net namespace
1130 * @name: name of interface
1132 * If a network interface is not present and the process has suitable
1133 * privileges this function loads the module. If module loading is not
1134 * available in this kernel then it becomes a nop.
1137 void dev_load(struct net
*net
, const char *name
)
1139 struct net_device
*dev
;
1143 dev
= dev_get_by_name_rcu(net
, name
);
1147 if (no_module
&& capable(CAP_NET_ADMIN
))
1148 no_module
= request_module("netdev-%s", name
);
1149 if (no_module
&& capable(CAP_SYS_MODULE
)) {
1150 if (!request_module("%s", name
))
1151 pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
1155 EXPORT_SYMBOL(dev_load
);
1157 static int __dev_open(struct net_device
*dev
)
1159 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1164 if (!netif_device_present(dev
))
1167 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1168 ret
= notifier_to_errno(ret
);
1172 set_bit(__LINK_STATE_START
, &dev
->state
);
1174 if (ops
->ndo_validate_addr
)
1175 ret
= ops
->ndo_validate_addr(dev
);
1177 if (!ret
&& ops
->ndo_open
)
1178 ret
= ops
->ndo_open(dev
);
1181 clear_bit(__LINK_STATE_START
, &dev
->state
);
1183 dev
->flags
|= IFF_UP
;
1184 net_dmaengine_get();
1185 dev_set_rx_mode(dev
);
1187 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1194 * dev_open - prepare an interface for use.
1195 * @dev: device to open
1197 * Takes a device from down to up state. The device's private open
1198 * function is invoked and then the multicast lists are loaded. Finally
1199 * the device is moved into the up state and a %NETDEV_UP message is
1200 * sent to the netdev notifier chain.
1202 * Calling this function on an active interface is a nop. On a failure
1203 * a negative errno code is returned.
1205 int dev_open(struct net_device
*dev
)
1209 if (dev
->flags
& IFF_UP
)
1212 ret
= __dev_open(dev
);
1216 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1217 call_netdevice_notifiers(NETDEV_UP
, dev
);
1221 EXPORT_SYMBOL(dev_open
);
1223 static int __dev_close_many(struct list_head
*head
)
1225 struct net_device
*dev
;
1230 list_for_each_entry(dev
, head
, unreg_list
) {
1231 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1233 clear_bit(__LINK_STATE_START
, &dev
->state
);
1235 /* Synchronize to scheduled poll. We cannot touch poll list, it
1236 * can be even on different cpu. So just clear netif_running().
1238 * dev->stop() will invoke napi_disable() on all of it's
1239 * napi_struct instances on this device.
1241 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1244 dev_deactivate_many(head
);
1246 list_for_each_entry(dev
, head
, unreg_list
) {
1247 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1250 * Call the device specific close. This cannot fail.
1251 * Only if device is UP
1253 * We allow it to be called even after a DETACH hot-plug
1259 dev
->flags
&= ~IFF_UP
;
1260 net_dmaengine_put();
1266 static int __dev_close(struct net_device
*dev
)
1271 list_add(&dev
->unreg_list
, &single
);
1272 retval
= __dev_close_many(&single
);
1277 static int dev_close_many(struct list_head
*head
)
1279 struct net_device
*dev
, *tmp
;
1280 LIST_HEAD(tmp_list
);
1282 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
)
1283 if (!(dev
->flags
& IFF_UP
))
1284 list_move(&dev
->unreg_list
, &tmp_list
);
1286 __dev_close_many(head
);
1288 list_for_each_entry(dev
, head
, unreg_list
) {
1289 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1290 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1293 /* rollback_registered_many needs the complete original list */
1294 list_splice(&tmp_list
, head
);
1299 * dev_close - shutdown an interface.
1300 * @dev: device to shutdown
1302 * This function moves an active device into down state. A
1303 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1304 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1307 int dev_close(struct net_device
*dev
)
1309 if (dev
->flags
& IFF_UP
) {
1312 list_add(&dev
->unreg_list
, &single
);
1313 dev_close_many(&single
);
1318 EXPORT_SYMBOL(dev_close
);
1322 * dev_disable_lro - disable Large Receive Offload on a device
1325 * Disable Large Receive Offload (LRO) on a net device. Must be
1326 * called under RTNL. This is needed if received packets may be
1327 * forwarded to another interface.
1329 void dev_disable_lro(struct net_device
*dev
)
1332 * If we're trying to disable lro on a vlan device
1333 * use the underlying physical device instead
1335 if (is_vlan_dev(dev
))
1336 dev
= vlan_dev_real_dev(dev
);
1338 dev
->wanted_features
&= ~NETIF_F_LRO
;
1339 netdev_update_features(dev
);
1341 if (unlikely(dev
->features
& NETIF_F_LRO
))
1342 netdev_WARN(dev
, "failed to disable LRO!\n");
1344 EXPORT_SYMBOL(dev_disable_lro
);
1347 static int dev_boot_phase
= 1;
1350 * register_netdevice_notifier - register a network notifier block
1353 * Register a notifier to be called when network device events occur.
1354 * The notifier passed is linked into the kernel structures and must
1355 * not be reused until it has been unregistered. A negative errno code
1356 * is returned on a failure.
1358 * When registered all registration and up events are replayed
1359 * to the new notifier to allow device to have a race free
1360 * view of the network device list.
1363 int register_netdevice_notifier(struct notifier_block
*nb
)
1365 struct net_device
*dev
;
1366 struct net_device
*last
;
1371 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1377 for_each_netdev(net
, dev
) {
1378 err
= nb
->notifier_call(nb
, NETDEV_REGISTER
, dev
);
1379 err
= notifier_to_errno(err
);
1383 if (!(dev
->flags
& IFF_UP
))
1386 nb
->notifier_call(nb
, NETDEV_UP
, dev
);
1397 for_each_netdev(net
, dev
) {
1401 if (dev
->flags
& IFF_UP
) {
1402 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1403 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1405 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1406 nb
->notifier_call(nb
, NETDEV_UNREGISTER_BATCH
, dev
);
1411 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1414 EXPORT_SYMBOL(register_netdevice_notifier
);
1417 * unregister_netdevice_notifier - unregister a network notifier block
1420 * Unregister a notifier previously registered by
1421 * register_netdevice_notifier(). The notifier is unlinked into the
1422 * kernel structures and may then be reused. A negative errno code
1423 * is returned on a failure.
1425 * After unregistering unregister and down device events are synthesized
1426 * for all devices on the device list to the removed notifier to remove
1427 * the need for special case cleanup code.
1430 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1432 struct net_device
*dev
;
1437 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1442 for_each_netdev(net
, dev
) {
1443 if (dev
->flags
& IFF_UP
) {
1444 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1445 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1447 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1448 nb
->notifier_call(nb
, NETDEV_UNREGISTER_BATCH
, dev
);
1455 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1458 * call_netdevice_notifiers - call all network notifier blocks
1459 * @val: value passed unmodified to notifier function
1460 * @dev: net_device pointer passed unmodified to notifier function
1462 * Call all network notifier blocks. Parameters and return value
1463 * are as for raw_notifier_call_chain().
1466 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1469 return raw_notifier_call_chain(&netdev_chain
, val
, dev
);
1471 EXPORT_SYMBOL(call_netdevice_notifiers
);
1473 static struct static_key netstamp_needed __read_mostly
;
1474 #ifdef HAVE_JUMP_LABEL
1475 /* We are not allowed to call static_key_slow_dec() from irq context
1476 * If net_disable_timestamp() is called from irq context, defer the
1477 * static_key_slow_dec() calls.
1479 static atomic_t netstamp_needed_deferred
;
1482 void net_enable_timestamp(void)
1484 #ifdef HAVE_JUMP_LABEL
1485 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1489 static_key_slow_dec(&netstamp_needed
);
1493 WARN_ON(in_interrupt());
1494 static_key_slow_inc(&netstamp_needed
);
1496 EXPORT_SYMBOL(net_enable_timestamp
);
1498 void net_disable_timestamp(void)
1500 #ifdef HAVE_JUMP_LABEL
1501 if (in_interrupt()) {
1502 atomic_inc(&netstamp_needed_deferred
);
1506 static_key_slow_dec(&netstamp_needed
);
1508 EXPORT_SYMBOL(net_disable_timestamp
);
1510 static inline void net_timestamp_set(struct sk_buff
*skb
)
1512 skb
->tstamp
.tv64
= 0;
1513 if (static_key_false(&netstamp_needed
))
1514 __net_timestamp(skb
);
1517 #define net_timestamp_check(COND, SKB) \
1518 if (static_key_false(&netstamp_needed)) { \
1519 if ((COND) && !(SKB)->tstamp.tv64) \
1520 __net_timestamp(SKB); \
1523 static int net_hwtstamp_validate(struct ifreq *ifr)
1525 struct hwtstamp_config cfg
;
1526 enum hwtstamp_tx_types tx_type
;
1527 enum hwtstamp_rx_filters rx_filter
;
1528 int tx_type_valid
= 0;
1529 int rx_filter_valid
= 0;
1531 if (copy_from_user(&cfg
, ifr
->ifr_data
, sizeof(cfg
)))
1534 if (cfg
.flags
) /* reserved for future extensions */
1537 tx_type
= cfg
.tx_type
;
1538 rx_filter
= cfg
.rx_filter
;
1541 case HWTSTAMP_TX_OFF
:
1542 case HWTSTAMP_TX_ON
:
1543 case HWTSTAMP_TX_ONESTEP_SYNC
:
1548 switch (rx_filter
) {
1549 case HWTSTAMP_FILTER_NONE
:
1550 case HWTSTAMP_FILTER_ALL
:
1551 case HWTSTAMP_FILTER_SOME
:
1552 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT
:
1553 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC
:
1554 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ
:
1555 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT
:
1556 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC
:
1557 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ
:
1558 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT
:
1559 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC
:
1560 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ
:
1561 case HWTSTAMP_FILTER_PTP_V2_EVENT
:
1562 case HWTSTAMP_FILTER_PTP_V2_SYNC
:
1563 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ
:
1564 rx_filter_valid
= 1;
1568 if (!tx_type_valid
|| !rx_filter_valid
)
1574 static inline bool is_skb_forwardable(struct net_device
*dev
,
1575 struct sk_buff
*skb
)
1579 if (!(dev
->flags
& IFF_UP
))
1582 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1583 if (skb
->len
<= len
)
1586 /* if TSO is enabled, we don't care about the length as the packet
1587 * could be forwarded without being segmented before
1589 if (skb_is_gso(skb
))
1596 * dev_forward_skb - loopback an skb to another netif
1598 * @dev: destination network device
1599 * @skb: buffer to forward
1602 * NET_RX_SUCCESS (no congestion)
1603 * NET_RX_DROP (packet was dropped, but freed)
1605 * dev_forward_skb can be used for injecting an skb from the
1606 * start_xmit function of one device into the receive queue
1607 * of another device.
1609 * The receiving device may be in another namespace, so
1610 * we have to clear all information in the skb that could
1611 * impact namespace isolation.
1613 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1615 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1616 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1617 atomic_long_inc(&dev
->rx_dropped
);
1626 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1627 atomic_long_inc(&dev
->rx_dropped
);
1634 skb
->tstamp
.tv64
= 0;
1635 skb
->pkt_type
= PACKET_HOST
;
1636 skb
->protocol
= eth_type_trans(skb
, dev
);
1640 return netif_rx(skb
);
1642 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1644 static inline int deliver_skb(struct sk_buff
*skb
,
1645 struct packet_type
*pt_prev
,
1646 struct net_device
*orig_dev
)
1648 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1650 atomic_inc(&skb
->users
);
1651 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1655 * Support routine. Sends outgoing frames to any network
1656 * taps currently in use.
1659 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1661 struct packet_type
*ptype
;
1662 struct sk_buff
*skb2
= NULL
;
1663 struct packet_type
*pt_prev
= NULL
;
1666 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1667 /* Never send packets back to the socket
1668 * they originated from - MvS (miquels@drinkel.ow.org)
1670 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1671 (ptype
->af_packet_priv
== NULL
||
1672 (struct sock
*)ptype
->af_packet_priv
!= skb
->sk
)) {
1674 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1679 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1683 net_timestamp_set(skb2
);
1685 /* skb->nh should be correctly
1686 set by sender, so that the second statement is
1687 just protection against buggy protocols.
1689 skb_reset_mac_header(skb2
);
1691 if (skb_network_header(skb2
) < skb2
->data
||
1692 skb2
->network_header
> skb2
->tail
) {
1693 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1694 ntohs(skb2
->protocol
),
1696 skb_reset_network_header(skb2
);
1699 skb2
->transport_header
= skb2
->network_header
;
1700 skb2
->pkt_type
= PACKET_OUTGOING
;
1705 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1710 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1711 * @dev: Network device
1712 * @txq: number of queues available
1714 * If real_num_tx_queues is changed the tc mappings may no longer be
1715 * valid. To resolve this verify the tc mapping remains valid and if
1716 * not NULL the mapping. With no priorities mapping to this
1717 * offset/count pair it will no longer be used. In the worst case TC0
1718 * is invalid nothing can be done so disable priority mappings. If is
1719 * expected that drivers will fix this mapping if they can before
1720 * calling netif_set_real_num_tx_queues.
1722 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1725 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1727 /* If TC0 is invalidated disable TC mapping */
1728 if (tc
->offset
+ tc
->count
> txq
) {
1729 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1734 /* Invalidated prio to tc mappings set to TC0 */
1735 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1736 int q
= netdev_get_prio_tc_map(dev
, i
);
1738 tc
= &dev
->tc_to_txq
[q
];
1739 if (tc
->offset
+ tc
->count
> txq
) {
1740 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1742 netdev_set_prio_tc_map(dev
, i
, 0);
1748 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1749 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1751 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
1755 if (txq
< 1 || txq
> dev
->num_tx_queues
)
1758 if (dev
->reg_state
== NETREG_REGISTERED
||
1759 dev
->reg_state
== NETREG_UNREGISTERING
) {
1762 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
1768 netif_setup_tc(dev
, txq
);
1770 if (txq
< dev
->real_num_tx_queues
)
1771 qdisc_reset_all_tx_gt(dev
, txq
);
1774 dev
->real_num_tx_queues
= txq
;
1777 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
1781 * netif_set_real_num_rx_queues - set actual number of RX queues used
1782 * @dev: Network device
1783 * @rxq: Actual number of RX queues
1785 * This must be called either with the rtnl_lock held or before
1786 * registration of the net device. Returns 0 on success, or a
1787 * negative error code. If called before registration, it always
1790 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
1794 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
1797 if (dev
->reg_state
== NETREG_REGISTERED
) {
1800 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
1806 dev
->real_num_rx_queues
= rxq
;
1809 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
1813 * netif_get_num_default_rss_queues - default number of RSS queues
1815 * This routine should set an upper limit on the number of RSS queues
1816 * used by default by multiqueue devices.
1818 int netif_get_num_default_rss_queues(void)
1820 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
1822 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
1824 static inline void __netif_reschedule(struct Qdisc
*q
)
1826 struct softnet_data
*sd
;
1827 unsigned long flags
;
1829 local_irq_save(flags
);
1830 sd
= &__get_cpu_var(softnet_data
);
1831 q
->next_sched
= NULL
;
1832 *sd
->output_queue_tailp
= q
;
1833 sd
->output_queue_tailp
= &q
->next_sched
;
1834 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1835 local_irq_restore(flags
);
1838 void __netif_schedule(struct Qdisc
*q
)
1840 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
1841 __netif_reschedule(q
);
1843 EXPORT_SYMBOL(__netif_schedule
);
1845 void dev_kfree_skb_irq(struct sk_buff
*skb
)
1847 if (atomic_dec_and_test(&skb
->users
)) {
1848 struct softnet_data
*sd
;
1849 unsigned long flags
;
1851 local_irq_save(flags
);
1852 sd
= &__get_cpu_var(softnet_data
);
1853 skb
->next
= sd
->completion_queue
;
1854 sd
->completion_queue
= skb
;
1855 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1856 local_irq_restore(flags
);
1859 EXPORT_SYMBOL(dev_kfree_skb_irq
);
1861 void dev_kfree_skb_any(struct sk_buff
*skb
)
1863 if (in_irq() || irqs_disabled())
1864 dev_kfree_skb_irq(skb
);
1868 EXPORT_SYMBOL(dev_kfree_skb_any
);
1872 * netif_device_detach - mark device as removed
1873 * @dev: network device
1875 * Mark device as removed from system and therefore no longer available.
1877 void netif_device_detach(struct net_device
*dev
)
1879 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1880 netif_running(dev
)) {
1881 netif_tx_stop_all_queues(dev
);
1884 EXPORT_SYMBOL(netif_device_detach
);
1887 * netif_device_attach - mark device as attached
1888 * @dev: network device
1890 * Mark device as attached from system and restart if needed.
1892 void netif_device_attach(struct net_device
*dev
)
1894 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1895 netif_running(dev
)) {
1896 netif_tx_wake_all_queues(dev
);
1897 __netdev_watchdog_up(dev
);
1900 EXPORT_SYMBOL(netif_device_attach
);
1902 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
1904 static const netdev_features_t null_features
= 0;
1905 struct net_device
*dev
= skb
->dev
;
1906 const char *driver
= "";
1908 if (dev
&& dev
->dev
.parent
)
1909 driver
= dev_driver_string(dev
->dev
.parent
);
1911 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
1912 "gso_type=%d ip_summed=%d\n",
1913 driver
, dev
? &dev
->features
: &null_features
,
1914 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
1915 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
1916 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
1920 * Invalidate hardware checksum when packet is to be mangled, and
1921 * complete checksum manually on outgoing path.
1923 int skb_checksum_help(struct sk_buff
*skb
)
1926 int ret
= 0, offset
;
1928 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
1929 goto out_set_summed
;
1931 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
1932 skb_warn_bad_offload(skb
);
1936 offset
= skb_checksum_start_offset(skb
);
1937 BUG_ON(offset
>= skb_headlen(skb
));
1938 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
1940 offset
+= skb
->csum_offset
;
1941 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
1943 if (skb_cloned(skb
) &&
1944 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
1945 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
1950 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
1952 skb
->ip_summed
= CHECKSUM_NONE
;
1956 EXPORT_SYMBOL(skb_checksum_help
);
1959 * skb_gso_segment - Perform segmentation on skb.
1960 * @skb: buffer to segment
1961 * @features: features for the output path (see dev->features)
1963 * This function segments the given skb and returns a list of segments.
1965 * It may return NULL if the skb requires no segmentation. This is
1966 * only possible when GSO is used for verifying header integrity.
1968 struct sk_buff
*skb_gso_segment(struct sk_buff
*skb
,
1969 netdev_features_t features
)
1971 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
1972 struct packet_type
*ptype
;
1973 __be16 type
= skb
->protocol
;
1974 int vlan_depth
= ETH_HLEN
;
1977 while (type
== htons(ETH_P_8021Q
)) {
1978 struct vlan_hdr
*vh
;
1980 if (unlikely(!pskb_may_pull(skb
, vlan_depth
+ VLAN_HLEN
)))
1981 return ERR_PTR(-EINVAL
);
1983 vh
= (struct vlan_hdr
*)(skb
->data
+ vlan_depth
);
1984 type
= vh
->h_vlan_encapsulated_proto
;
1985 vlan_depth
+= VLAN_HLEN
;
1988 skb_reset_mac_header(skb
);
1989 skb
->mac_len
= skb
->network_header
- skb
->mac_header
;
1990 __skb_pull(skb
, skb
->mac_len
);
1992 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
1993 skb_warn_bad_offload(skb
);
1995 if (skb_header_cloned(skb
) &&
1996 (err
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
)))
1997 return ERR_PTR(err
);
2001 list_for_each_entry_rcu(ptype
,
2002 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
2003 if (ptype
->type
== type
&& !ptype
->dev
&& ptype
->gso_segment
) {
2004 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2005 err
= ptype
->gso_send_check(skb
);
2006 segs
= ERR_PTR(err
);
2007 if (err
|| skb_gso_ok(skb
, features
))
2009 __skb_push(skb
, (skb
->data
-
2010 skb_network_header(skb
)));
2012 segs
= ptype
->gso_segment(skb
, features
);
2018 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2022 EXPORT_SYMBOL(skb_gso_segment
);
2024 /* Take action when hardware reception checksum errors are detected. */
2026 void netdev_rx_csum_fault(struct net_device
*dev
)
2028 if (net_ratelimit()) {
2029 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2033 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2036 /* Actually, we should eliminate this check as soon as we know, that:
2037 * 1. IOMMU is present and allows to map all the memory.
2038 * 2. No high memory really exists on this machine.
2041 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2043 #ifdef CONFIG_HIGHMEM
2045 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2046 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2047 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2048 if (PageHighMem(skb_frag_page(frag
)))
2053 if (PCI_DMA_BUS_IS_PHYS
) {
2054 struct device
*pdev
= dev
->dev
.parent
;
2058 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2059 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2060 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2061 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2070 void (*destructor
)(struct sk_buff
*skb
);
2073 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2075 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
2077 struct dev_gso_cb
*cb
;
2080 struct sk_buff
*nskb
= skb
->next
;
2082 skb
->next
= nskb
->next
;
2085 } while (skb
->next
);
2087 cb
= DEV_GSO_CB(skb
);
2089 cb
->destructor(skb
);
2093 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2094 * @skb: buffer to segment
2095 * @features: device features as applicable to this skb
2097 * This function segments the given skb and stores the list of segments
2100 static int dev_gso_segment(struct sk_buff
*skb
, netdev_features_t features
)
2102 struct sk_buff
*segs
;
2104 segs
= skb_gso_segment(skb
, features
);
2106 /* Verifying header integrity only. */
2111 return PTR_ERR(segs
);
2114 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
2115 skb
->destructor
= dev_gso_skb_destructor
;
2120 static bool can_checksum_protocol(netdev_features_t features
, __be16 protocol
)
2122 return ((features
& NETIF_F_GEN_CSUM
) ||
2123 ((features
& NETIF_F_V4_CSUM
) &&
2124 protocol
== htons(ETH_P_IP
)) ||
2125 ((features
& NETIF_F_V6_CSUM
) &&
2126 protocol
== htons(ETH_P_IPV6
)) ||
2127 ((features
& NETIF_F_FCOE_CRC
) &&
2128 protocol
== htons(ETH_P_FCOE
)));
2131 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2132 __be16 protocol
, netdev_features_t features
)
2134 if (!can_checksum_protocol(features
, protocol
)) {
2135 features
&= ~NETIF_F_ALL_CSUM
;
2136 features
&= ~NETIF_F_SG
;
2137 } else if (illegal_highdma(skb
->dev
, skb
)) {
2138 features
&= ~NETIF_F_SG
;
2144 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2146 __be16 protocol
= skb
->protocol
;
2147 netdev_features_t features
= skb
->dev
->features
;
2149 if (skb_shinfo(skb
)->gso_segs
> skb
->dev
->gso_max_segs
)
2150 features
&= ~NETIF_F_GSO_MASK
;
2152 if (protocol
== htons(ETH_P_8021Q
)) {
2153 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
2154 protocol
= veh
->h_vlan_encapsulated_proto
;
2155 } else if (!vlan_tx_tag_present(skb
)) {
2156 return harmonize_features(skb
, protocol
, features
);
2159 features
&= (skb
->dev
->vlan_features
| NETIF_F_HW_VLAN_TX
);
2161 if (protocol
!= htons(ETH_P_8021Q
)) {
2162 return harmonize_features(skb
, protocol
, features
);
2164 features
&= NETIF_F_SG
| NETIF_F_HIGHDMA
| NETIF_F_FRAGLIST
|
2165 NETIF_F_GEN_CSUM
| NETIF_F_HW_VLAN_TX
;
2166 return harmonize_features(skb
, protocol
, features
);
2169 EXPORT_SYMBOL(netif_skb_features
);
2172 * Returns true if either:
2173 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2174 * 2. skb is fragmented and the device does not support SG, or if
2175 * at least one of fragments is in highmem and device does not
2176 * support DMA from it.
2178 static inline int skb_needs_linearize(struct sk_buff
*skb
,
2181 return skb_is_nonlinear(skb
) &&
2182 ((skb_has_frag_list(skb
) &&
2183 !(features
& NETIF_F_FRAGLIST
)) ||
2184 (skb_shinfo(skb
)->nr_frags
&&
2185 !(features
& NETIF_F_SG
)));
2188 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
2189 struct netdev_queue
*txq
)
2191 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2192 int rc
= NETDEV_TX_OK
;
2193 unsigned int skb_len
;
2195 if (likely(!skb
->next
)) {
2196 netdev_features_t features
;
2199 * If device doesn't need skb->dst, release it right now while
2200 * its hot in this cpu cache
2202 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2205 if (!list_empty(&ptype_all
))
2206 dev_queue_xmit_nit(skb
, dev
);
2208 features
= netif_skb_features(skb
);
2210 if (vlan_tx_tag_present(skb
) &&
2211 !(features
& NETIF_F_HW_VLAN_TX
)) {
2212 skb
= __vlan_put_tag(skb
, vlan_tx_tag_get(skb
));
2219 if (netif_needs_gso(skb
, features
)) {
2220 if (unlikely(dev_gso_segment(skb
, features
)))
2225 if (skb_needs_linearize(skb
, features
) &&
2226 __skb_linearize(skb
))
2229 /* If packet is not checksummed and device does not
2230 * support checksumming for this protocol, complete
2231 * checksumming here.
2233 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2234 skb_set_transport_header(skb
,
2235 skb_checksum_start_offset(skb
));
2236 if (!(features
& NETIF_F_ALL_CSUM
) &&
2237 skb_checksum_help(skb
))
2243 rc
= ops
->ndo_start_xmit(skb
, dev
);
2244 trace_net_dev_xmit(skb
, rc
, dev
, skb_len
);
2245 if (rc
== NETDEV_TX_OK
)
2246 txq_trans_update(txq
);
2252 struct sk_buff
*nskb
= skb
->next
;
2254 skb
->next
= nskb
->next
;
2258 * If device doesn't need nskb->dst, release it right now while
2259 * its hot in this cpu cache
2261 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2264 skb_len
= nskb
->len
;
2265 rc
= ops
->ndo_start_xmit(nskb
, dev
);
2266 trace_net_dev_xmit(nskb
, rc
, dev
, skb_len
);
2267 if (unlikely(rc
!= NETDEV_TX_OK
)) {
2268 if (rc
& ~NETDEV_TX_MASK
)
2269 goto out_kfree_gso_skb
;
2270 nskb
->next
= skb
->next
;
2274 txq_trans_update(txq
);
2275 if (unlikely(netif_xmit_stopped(txq
) && skb
->next
))
2276 return NETDEV_TX_BUSY
;
2277 } while (skb
->next
);
2280 if (likely(skb
->next
== NULL
))
2281 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
2288 static u32 hashrnd __read_mostly
;
2291 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2292 * to be used as a distribution range.
2294 u16
__skb_tx_hash(const struct net_device
*dev
, const struct sk_buff
*skb
,
2295 unsigned int num_tx_queues
)
2299 u16 qcount
= num_tx_queues
;
2301 if (skb_rx_queue_recorded(skb
)) {
2302 hash
= skb_get_rx_queue(skb
);
2303 while (unlikely(hash
>= num_tx_queues
))
2304 hash
-= num_tx_queues
;
2309 u8 tc
= netdev_get_prio_tc_map(dev
, skb
->priority
);
2310 qoffset
= dev
->tc_to_txq
[tc
].offset
;
2311 qcount
= dev
->tc_to_txq
[tc
].count
;
2314 if (skb
->sk
&& skb
->sk
->sk_hash
)
2315 hash
= skb
->sk
->sk_hash
;
2317 hash
= (__force u16
) skb
->protocol
;
2318 hash
= jhash_1word(hash
, hashrnd
);
2320 return (u16
) (((u64
) hash
* qcount
) >> 32) + qoffset
;
2322 EXPORT_SYMBOL(__skb_tx_hash
);
2324 static inline u16
dev_cap_txqueue(struct net_device
*dev
, u16 queue_index
)
2326 if (unlikely(queue_index
>= dev
->real_num_tx_queues
)) {
2327 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
2328 dev
->name
, queue_index
,
2329 dev
->real_num_tx_queues
);
2335 static inline int get_xps_queue(struct net_device
*dev
, struct sk_buff
*skb
)
2338 struct xps_dev_maps
*dev_maps
;
2339 struct xps_map
*map
;
2340 int queue_index
= -1;
2343 dev_maps
= rcu_dereference(dev
->xps_maps
);
2345 map
= rcu_dereference(
2346 dev_maps
->cpu_map
[raw_smp_processor_id()]);
2349 queue_index
= map
->queues
[0];
2352 if (skb
->sk
&& skb
->sk
->sk_hash
)
2353 hash
= skb
->sk
->sk_hash
;
2355 hash
= (__force u16
) skb
->protocol
^
2357 hash
= jhash_1word(hash
, hashrnd
);
2358 queue_index
= map
->queues
[
2359 ((u64
)hash
* map
->len
) >> 32];
2361 if (unlikely(queue_index
>= dev
->real_num_tx_queues
))
2373 static struct netdev_queue
*dev_pick_tx(struct net_device
*dev
,
2374 struct sk_buff
*skb
)
2377 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2379 if (dev
->real_num_tx_queues
== 1)
2381 else if (ops
->ndo_select_queue
) {
2382 queue_index
= ops
->ndo_select_queue(dev
, skb
);
2383 queue_index
= dev_cap_txqueue(dev
, queue_index
);
2385 struct sock
*sk
= skb
->sk
;
2386 queue_index
= sk_tx_queue_get(sk
);
2388 if (queue_index
< 0 || skb
->ooo_okay
||
2389 queue_index
>= dev
->real_num_tx_queues
) {
2390 int old_index
= queue_index
;
2392 queue_index
= get_xps_queue(dev
, skb
);
2393 if (queue_index
< 0)
2394 queue_index
= skb_tx_hash(dev
, skb
);
2396 if (queue_index
!= old_index
&& sk
) {
2397 struct dst_entry
*dst
=
2398 rcu_dereference_check(sk
->sk_dst_cache
, 1);
2400 if (dst
&& skb_dst(skb
) == dst
)
2401 sk_tx_queue_set(sk
, queue_index
);
2406 skb_set_queue_mapping(skb
, queue_index
);
2407 return netdev_get_tx_queue(dev
, queue_index
);
2410 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2411 struct net_device
*dev
,
2412 struct netdev_queue
*txq
)
2414 spinlock_t
*root_lock
= qdisc_lock(q
);
2418 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2419 qdisc_calculate_pkt_len(skb
, q
);
2421 * Heuristic to force contended enqueues to serialize on a
2422 * separate lock before trying to get qdisc main lock.
2423 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2424 * and dequeue packets faster.
2426 contended
= qdisc_is_running(q
);
2427 if (unlikely(contended
))
2428 spin_lock(&q
->busylock
);
2430 spin_lock(root_lock
);
2431 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2434 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2435 qdisc_run_begin(q
)) {
2437 * This is a work-conserving queue; there are no old skbs
2438 * waiting to be sent out; and the qdisc is not running -
2439 * xmit the skb directly.
2441 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2444 qdisc_bstats_update(q
, skb
);
2446 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2447 if (unlikely(contended
)) {
2448 spin_unlock(&q
->busylock
);
2455 rc
= NET_XMIT_SUCCESS
;
2458 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2459 if (qdisc_run_begin(q
)) {
2460 if (unlikely(contended
)) {
2461 spin_unlock(&q
->busylock
);
2467 spin_unlock(root_lock
);
2468 if (unlikely(contended
))
2469 spin_unlock(&q
->busylock
);
2473 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
2474 static void skb_update_prio(struct sk_buff
*skb
)
2476 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2478 if (!skb
->priority
&& skb
->sk
&& map
) {
2479 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2481 if (prioidx
< map
->priomap_len
)
2482 skb
->priority
= map
->priomap
[prioidx
];
2486 #define skb_update_prio(skb)
2489 static DEFINE_PER_CPU(int, xmit_recursion
);
2490 #define RECURSION_LIMIT 10
2493 * dev_loopback_xmit - loop back @skb
2494 * @skb: buffer to transmit
2496 int dev_loopback_xmit(struct sk_buff
*skb
)
2498 skb_reset_mac_header(skb
);
2499 __skb_pull(skb
, skb_network_offset(skb
));
2500 skb
->pkt_type
= PACKET_LOOPBACK
;
2501 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2502 WARN_ON(!skb_dst(skb
));
2507 EXPORT_SYMBOL(dev_loopback_xmit
);
2510 * dev_queue_xmit - transmit a buffer
2511 * @skb: buffer to transmit
2513 * Queue a buffer for transmission to a network device. The caller must
2514 * have set the device and priority and built the buffer before calling
2515 * this function. The function can be called from an interrupt.
2517 * A negative errno code is returned on a failure. A success does not
2518 * guarantee the frame will be transmitted as it may be dropped due
2519 * to congestion or traffic shaping.
2521 * -----------------------------------------------------------------------------------
2522 * I notice this method can also return errors from the queue disciplines,
2523 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2526 * Regardless of the return value, the skb is consumed, so it is currently
2527 * difficult to retry a send to this method. (You can bump the ref count
2528 * before sending to hold a reference for retry if you are careful.)
2530 * When calling this method, interrupts MUST be enabled. This is because
2531 * the BH enable code must have IRQs enabled so that it will not deadlock.
2534 int dev_queue_xmit(struct sk_buff
*skb
)
2536 struct net_device
*dev
= skb
->dev
;
2537 struct netdev_queue
*txq
;
2541 /* Disable soft irqs for various locks below. Also
2542 * stops preemption for RCU.
2546 skb_update_prio(skb
);
2548 txq
= dev_pick_tx(dev
, skb
);
2549 q
= rcu_dereference_bh(txq
->qdisc
);
2551 #ifdef CONFIG_NET_CLS_ACT
2552 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2554 trace_net_dev_queue(skb
);
2556 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2560 /* The device has no queue. Common case for software devices:
2561 loopback, all the sorts of tunnels...
2563 Really, it is unlikely that netif_tx_lock protection is necessary
2564 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2566 However, it is possible, that they rely on protection
2569 Check this and shot the lock. It is not prone from deadlocks.
2570 Either shot noqueue qdisc, it is even simpler 8)
2572 if (dev
->flags
& IFF_UP
) {
2573 int cpu
= smp_processor_id(); /* ok because BHs are off */
2575 if (txq
->xmit_lock_owner
!= cpu
) {
2577 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2578 goto recursion_alert
;
2580 HARD_TX_LOCK(dev
, txq
, cpu
);
2582 if (!netif_xmit_stopped(txq
)) {
2583 __this_cpu_inc(xmit_recursion
);
2584 rc
= dev_hard_start_xmit(skb
, dev
, txq
);
2585 __this_cpu_dec(xmit_recursion
);
2586 if (dev_xmit_complete(rc
)) {
2587 HARD_TX_UNLOCK(dev
, txq
);
2591 HARD_TX_UNLOCK(dev
, txq
);
2592 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2595 /* Recursion is detected! It is possible,
2599 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2605 rcu_read_unlock_bh();
2610 rcu_read_unlock_bh();
2613 EXPORT_SYMBOL(dev_queue_xmit
);
2616 /*=======================================================================
2618 =======================================================================*/
2620 int netdev_max_backlog __read_mostly
= 1000;
2621 int netdev_tstamp_prequeue __read_mostly
= 1;
2622 int netdev_budget __read_mostly
= 300;
2623 int weight_p __read_mostly
= 64; /* old backlog weight */
2625 /* Called with irq disabled */
2626 static inline void ____napi_schedule(struct softnet_data
*sd
,
2627 struct napi_struct
*napi
)
2629 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
2630 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2634 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2635 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2636 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2637 * if hash is a canonical 4-tuple hash over transport ports.
2639 void __skb_get_rxhash(struct sk_buff
*skb
)
2641 struct flow_keys keys
;
2644 if (!skb_flow_dissect(skb
, &keys
))
2648 if ((__force u16
)keys
.port16
[1] < (__force u16
)keys
.port16
[0])
2649 swap(keys
.port16
[0], keys
.port16
[1]);
2653 /* get a consistent hash (same value on both flow directions) */
2654 if ((__force u32
)keys
.dst
< (__force u32
)keys
.src
)
2655 swap(keys
.dst
, keys
.src
);
2657 hash
= jhash_3words((__force u32
)keys
.dst
,
2658 (__force u32
)keys
.src
,
2659 (__force u32
)keys
.ports
, hashrnd
);
2665 EXPORT_SYMBOL(__skb_get_rxhash
);
2669 /* One global table that all flow-based protocols share. */
2670 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
2671 EXPORT_SYMBOL(rps_sock_flow_table
);
2673 struct static_key rps_needed __read_mostly
;
2675 static struct rps_dev_flow
*
2676 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2677 struct rps_dev_flow
*rflow
, u16 next_cpu
)
2679 if (next_cpu
!= RPS_NO_CPU
) {
2680 #ifdef CONFIG_RFS_ACCEL
2681 struct netdev_rx_queue
*rxqueue
;
2682 struct rps_dev_flow_table
*flow_table
;
2683 struct rps_dev_flow
*old_rflow
;
2688 /* Should we steer this flow to a different hardware queue? */
2689 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
2690 !(dev
->features
& NETIF_F_NTUPLE
))
2692 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
2693 if (rxq_index
== skb_get_rx_queue(skb
))
2696 rxqueue
= dev
->_rx
+ rxq_index
;
2697 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2700 flow_id
= skb
->rxhash
& flow_table
->mask
;
2701 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
2702 rxq_index
, flow_id
);
2706 rflow
= &flow_table
->flows
[flow_id
];
2708 if (old_rflow
->filter
== rflow
->filter
)
2709 old_rflow
->filter
= RPS_NO_FILTER
;
2713 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
2716 rflow
->cpu
= next_cpu
;
2721 * get_rps_cpu is called from netif_receive_skb and returns the target
2722 * CPU from the RPS map of the receiving queue for a given skb.
2723 * rcu_read_lock must be held on entry.
2725 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2726 struct rps_dev_flow
**rflowp
)
2728 struct netdev_rx_queue
*rxqueue
;
2729 struct rps_map
*map
;
2730 struct rps_dev_flow_table
*flow_table
;
2731 struct rps_sock_flow_table
*sock_flow_table
;
2735 if (skb_rx_queue_recorded(skb
)) {
2736 u16 index
= skb_get_rx_queue(skb
);
2737 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
2738 WARN_ONCE(dev
->real_num_rx_queues
> 1,
2739 "%s received packet on queue %u, but number "
2740 "of RX queues is %u\n",
2741 dev
->name
, index
, dev
->real_num_rx_queues
);
2744 rxqueue
= dev
->_rx
+ index
;
2748 map
= rcu_dereference(rxqueue
->rps_map
);
2750 if (map
->len
== 1 &&
2751 !rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2752 tcpu
= map
->cpus
[0];
2753 if (cpu_online(tcpu
))
2757 } else if (!rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2761 skb_reset_network_header(skb
);
2762 if (!skb_get_rxhash(skb
))
2765 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2766 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
2767 if (flow_table
&& sock_flow_table
) {
2769 struct rps_dev_flow
*rflow
;
2771 rflow
= &flow_table
->flows
[skb
->rxhash
& flow_table
->mask
];
2774 next_cpu
= sock_flow_table
->ents
[skb
->rxhash
&
2775 sock_flow_table
->mask
];
2778 * If the desired CPU (where last recvmsg was done) is
2779 * different from current CPU (one in the rx-queue flow
2780 * table entry), switch if one of the following holds:
2781 * - Current CPU is unset (equal to RPS_NO_CPU).
2782 * - Current CPU is offline.
2783 * - The current CPU's queue tail has advanced beyond the
2784 * last packet that was enqueued using this table entry.
2785 * This guarantees that all previous packets for the flow
2786 * have been dequeued, thus preserving in order delivery.
2788 if (unlikely(tcpu
!= next_cpu
) &&
2789 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
2790 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
2791 rflow
->last_qtail
)) >= 0))
2792 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
2794 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
2802 tcpu
= map
->cpus
[((u64
) skb
->rxhash
* map
->len
) >> 32];
2804 if (cpu_online(tcpu
)) {
2814 #ifdef CONFIG_RFS_ACCEL
2817 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2818 * @dev: Device on which the filter was set
2819 * @rxq_index: RX queue index
2820 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2821 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2823 * Drivers that implement ndo_rx_flow_steer() should periodically call
2824 * this function for each installed filter and remove the filters for
2825 * which it returns %true.
2827 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
2828 u32 flow_id
, u16 filter_id
)
2830 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
2831 struct rps_dev_flow_table
*flow_table
;
2832 struct rps_dev_flow
*rflow
;
2837 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2838 if (flow_table
&& flow_id
<= flow_table
->mask
) {
2839 rflow
= &flow_table
->flows
[flow_id
];
2840 cpu
= ACCESS_ONCE(rflow
->cpu
);
2841 if (rflow
->filter
== filter_id
&& cpu
!= RPS_NO_CPU
&&
2842 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
2843 rflow
->last_qtail
) <
2844 (int)(10 * flow_table
->mask
)))
2850 EXPORT_SYMBOL(rps_may_expire_flow
);
2852 #endif /* CONFIG_RFS_ACCEL */
2854 /* Called from hardirq (IPI) context */
2855 static void rps_trigger_softirq(void *data
)
2857 struct softnet_data
*sd
= data
;
2859 ____napi_schedule(sd
, &sd
->backlog
);
2863 #endif /* CONFIG_RPS */
2866 * Check if this softnet_data structure is another cpu one
2867 * If yes, queue it to our IPI list and return 1
2870 static int rps_ipi_queued(struct softnet_data
*sd
)
2873 struct softnet_data
*mysd
= &__get_cpu_var(softnet_data
);
2876 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
2877 mysd
->rps_ipi_list
= sd
;
2879 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2882 #endif /* CONFIG_RPS */
2887 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2888 * queue (may be a remote CPU queue).
2890 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
2891 unsigned int *qtail
)
2893 struct softnet_data
*sd
;
2894 unsigned long flags
;
2896 sd
= &per_cpu(softnet_data
, cpu
);
2898 local_irq_save(flags
);
2901 if (skb_queue_len(&sd
->input_pkt_queue
) <= netdev_max_backlog
) {
2902 if (skb_queue_len(&sd
->input_pkt_queue
)) {
2904 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
2905 input_queue_tail_incr_save(sd
, qtail
);
2907 local_irq_restore(flags
);
2908 return NET_RX_SUCCESS
;
2911 /* Schedule NAPI for backlog device
2912 * We can use non atomic operation since we own the queue lock
2914 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
2915 if (!rps_ipi_queued(sd
))
2916 ____napi_schedule(sd
, &sd
->backlog
);
2924 local_irq_restore(flags
);
2926 atomic_long_inc(&skb
->dev
->rx_dropped
);
2932 * netif_rx - post buffer to the network code
2933 * @skb: buffer to post
2935 * This function receives a packet from a device driver and queues it for
2936 * the upper (protocol) levels to process. It always succeeds. The buffer
2937 * may be dropped during processing for congestion control or by the
2941 * NET_RX_SUCCESS (no congestion)
2942 * NET_RX_DROP (packet was dropped)
2946 int netif_rx(struct sk_buff
*skb
)
2950 /* if netpoll wants it, pretend we never saw it */
2951 if (netpoll_rx(skb
))
2954 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
2956 trace_netif_rx(skb
);
2958 if (static_key_false(&rps_needed
)) {
2959 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
2965 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
2967 cpu
= smp_processor_id();
2969 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
2977 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
2982 EXPORT_SYMBOL(netif_rx
);
2984 int netif_rx_ni(struct sk_buff
*skb
)
2989 err
= netif_rx(skb
);
2990 if (local_softirq_pending())
2996 EXPORT_SYMBOL(netif_rx_ni
);
2998 static void net_tx_action(struct softirq_action
*h
)
3000 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3002 if (sd
->completion_queue
) {
3003 struct sk_buff
*clist
;
3005 local_irq_disable();
3006 clist
= sd
->completion_queue
;
3007 sd
->completion_queue
= NULL
;
3011 struct sk_buff
*skb
= clist
;
3012 clist
= clist
->next
;
3014 WARN_ON(atomic_read(&skb
->users
));
3015 trace_kfree_skb(skb
, net_tx_action
);
3020 if (sd
->output_queue
) {
3023 local_irq_disable();
3024 head
= sd
->output_queue
;
3025 sd
->output_queue
= NULL
;
3026 sd
->output_queue_tailp
= &sd
->output_queue
;
3030 struct Qdisc
*q
= head
;
3031 spinlock_t
*root_lock
;
3033 head
= head
->next_sched
;
3035 root_lock
= qdisc_lock(q
);
3036 if (spin_trylock(root_lock
)) {
3037 smp_mb__before_clear_bit();
3038 clear_bit(__QDISC_STATE_SCHED
,
3041 spin_unlock(root_lock
);
3043 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3045 __netif_reschedule(q
);
3047 smp_mb__before_clear_bit();
3048 clear_bit(__QDISC_STATE_SCHED
,
3056 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3057 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3058 /* This hook is defined here for ATM LANE */
3059 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3060 unsigned char *addr
) __read_mostly
;
3061 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3064 #ifdef CONFIG_NET_CLS_ACT
3065 /* TODO: Maybe we should just force sch_ingress to be compiled in
3066 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3067 * a compare and 2 stores extra right now if we dont have it on
3068 * but have CONFIG_NET_CLS_ACT
3069 * NOTE: This doesn't stop any functionality; if you dont have
3070 * the ingress scheduler, you just can't add policies on ingress.
3073 static int ing_filter(struct sk_buff
*skb
, struct netdev_queue
*rxq
)
3075 struct net_device
*dev
= skb
->dev
;
3076 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
3077 int result
= TC_ACT_OK
;
3080 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
3081 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3082 skb
->skb_iif
, dev
->ifindex
);
3086 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
3087 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3090 if (q
!= &noop_qdisc
) {
3091 spin_lock(qdisc_lock(q
));
3092 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
3093 result
= qdisc_enqueue_root(skb
, q
);
3094 spin_unlock(qdisc_lock(q
));
3100 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3101 struct packet_type
**pt_prev
,
3102 int *ret
, struct net_device
*orig_dev
)
3104 struct netdev_queue
*rxq
= rcu_dereference(skb
->dev
->ingress_queue
);
3106 if (!rxq
|| rxq
->qdisc
== &noop_qdisc
)
3110 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3114 switch (ing_filter(skb
, rxq
)) {
3128 * netdev_rx_handler_register - register receive handler
3129 * @dev: device to register a handler for
3130 * @rx_handler: receive handler to register
3131 * @rx_handler_data: data pointer that is used by rx handler
3133 * Register a receive hander for a device. This handler will then be
3134 * called from __netif_receive_skb. A negative errno code is returned
3137 * The caller must hold the rtnl_mutex.
3139 * For a general description of rx_handler, see enum rx_handler_result.
3141 int netdev_rx_handler_register(struct net_device
*dev
,
3142 rx_handler_func_t
*rx_handler
,
3143 void *rx_handler_data
)
3147 if (dev
->rx_handler
)
3150 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3151 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3155 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3158 * netdev_rx_handler_unregister - unregister receive handler
3159 * @dev: device to unregister a handler from
3161 * Unregister a receive hander from a device.
3163 * The caller must hold the rtnl_mutex.
3165 void netdev_rx_handler_unregister(struct net_device
*dev
)
3169 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3170 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3172 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3175 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3176 * the special handling of PFMEMALLOC skbs.
3178 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3180 switch (skb
->protocol
) {
3181 case __constant_htons(ETH_P_ARP
):
3182 case __constant_htons(ETH_P_IP
):
3183 case __constant_htons(ETH_P_IPV6
):
3184 case __constant_htons(ETH_P_8021Q
):
3191 static int __netif_receive_skb(struct sk_buff
*skb
)
3193 struct packet_type
*ptype
, *pt_prev
;
3194 rx_handler_func_t
*rx_handler
;
3195 struct net_device
*orig_dev
;
3196 struct net_device
*null_or_dev
;
3197 bool deliver_exact
= false;
3198 int ret
= NET_RX_DROP
;
3200 unsigned long pflags
= current
->flags
;
3202 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3204 trace_netif_receive_skb(skb
);
3207 * PFMEMALLOC skbs are special, they should
3208 * - be delivered to SOCK_MEMALLOC sockets only
3209 * - stay away from userspace
3210 * - have bounded memory usage
3212 * Use PF_MEMALLOC as this saves us from propagating the allocation
3213 * context down to all allocation sites.
3215 if (sk_memalloc_socks() && skb_pfmemalloc(skb
))
3216 current
->flags
|= PF_MEMALLOC
;
3218 /* if we've gotten here through NAPI, check netpoll */
3219 if (netpoll_receive_skb(skb
))
3222 orig_dev
= skb
->dev
;
3224 skb_reset_network_header(skb
);
3225 skb_reset_transport_header(skb
);
3226 skb_reset_mac_len(skb
);
3233 skb
->skb_iif
= skb
->dev
->ifindex
;
3235 __this_cpu_inc(softnet_data
.processed
);
3237 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
)) {
3238 skb
= vlan_untag(skb
);
3243 #ifdef CONFIG_NET_CLS_ACT
3244 if (skb
->tc_verd
& TC_NCLS
) {
3245 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3250 if (sk_memalloc_socks() && skb_pfmemalloc(skb
))
3253 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3254 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
) {
3256 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3262 #ifdef CONFIG_NET_CLS_ACT
3263 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3269 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)
3270 && !skb_pfmemalloc_protocol(skb
))
3273 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3274 if (vlan_tx_tag_present(skb
)) {
3276 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3279 if (vlan_do_receive(&skb
, !rx_handler
))
3281 else if (unlikely(!skb
))
3287 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3290 switch (rx_handler(&skb
)) {
3291 case RX_HANDLER_CONSUMED
:
3293 case RX_HANDLER_ANOTHER
:
3295 case RX_HANDLER_EXACT
:
3296 deliver_exact
= true;
3297 case RX_HANDLER_PASS
:
3304 /* deliver only exact match when indicated */
3305 null_or_dev
= deliver_exact
? skb
->dev
: NULL
;
3307 type
= skb
->protocol
;
3308 list_for_each_entry_rcu(ptype
,
3309 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
3310 if (ptype
->type
== type
&&
3311 (ptype
->dev
== null_or_dev
|| ptype
->dev
== skb
->dev
||
3312 ptype
->dev
== orig_dev
)) {
3314 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3320 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3323 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3326 atomic_long_inc(&skb
->dev
->rx_dropped
);
3328 /* Jamal, now you will not able to escape explaining
3329 * me how you were going to use this. :-)
3337 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3342 * netif_receive_skb - process receive buffer from network
3343 * @skb: buffer to process
3345 * netif_receive_skb() is the main receive data processing function.
3346 * It always succeeds. The buffer may be dropped during processing
3347 * for congestion control or by the protocol layers.
3349 * This function may only be called from softirq context and interrupts
3350 * should be enabled.
3352 * Return values (usually ignored):
3353 * NET_RX_SUCCESS: no congestion
3354 * NET_RX_DROP: packet was dropped
3356 int netif_receive_skb(struct sk_buff
*skb
)
3358 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3360 if (skb_defer_rx_timestamp(skb
))
3361 return NET_RX_SUCCESS
;
3364 if (static_key_false(&rps_needed
)) {
3365 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3370 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3373 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3380 return __netif_receive_skb(skb
);
3382 EXPORT_SYMBOL(netif_receive_skb
);
3384 /* Network device is going away, flush any packets still pending
3385 * Called with irqs disabled.
3387 static void flush_backlog(void *arg
)
3389 struct net_device
*dev
= arg
;
3390 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3391 struct sk_buff
*skb
, *tmp
;
3394 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3395 if (skb
->dev
== dev
) {
3396 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3398 input_queue_head_incr(sd
);
3403 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3404 if (skb
->dev
== dev
) {
3405 __skb_unlink(skb
, &sd
->process_queue
);
3407 input_queue_head_incr(sd
);
3412 static int napi_gro_complete(struct sk_buff
*skb
)
3414 struct packet_type
*ptype
;
3415 __be16 type
= skb
->protocol
;
3416 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
3419 if (NAPI_GRO_CB(skb
)->count
== 1) {
3420 skb_shinfo(skb
)->gso_size
= 0;
3425 list_for_each_entry_rcu(ptype
, head
, list
) {
3426 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_complete
)
3429 err
= ptype
->gro_complete(skb
);
3435 WARN_ON(&ptype
->list
== head
);
3437 return NET_RX_SUCCESS
;
3441 return netif_receive_skb(skb
);
3444 inline void napi_gro_flush(struct napi_struct
*napi
)
3446 struct sk_buff
*skb
, *next
;
3448 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
3451 napi_gro_complete(skb
);
3454 napi
->gro_count
= 0;
3455 napi
->gro_list
= NULL
;
3457 EXPORT_SYMBOL(napi_gro_flush
);
3459 enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3461 struct sk_buff
**pp
= NULL
;
3462 struct packet_type
*ptype
;
3463 __be16 type
= skb
->protocol
;
3464 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
3467 enum gro_result ret
;
3469 if (!(skb
->dev
->features
& NETIF_F_GRO
) || netpoll_rx_on(skb
))
3472 if (skb_is_gso(skb
) || skb_has_frag_list(skb
))
3476 list_for_each_entry_rcu(ptype
, head
, list
) {
3477 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_receive
)
3480 skb_set_network_header(skb
, skb_gro_offset(skb
));
3481 mac_len
= skb
->network_header
- skb
->mac_header
;
3482 skb
->mac_len
= mac_len
;
3483 NAPI_GRO_CB(skb
)->same_flow
= 0;
3484 NAPI_GRO_CB(skb
)->flush
= 0;
3485 NAPI_GRO_CB(skb
)->free
= 0;
3487 pp
= ptype
->gro_receive(&napi
->gro_list
, skb
);
3492 if (&ptype
->list
== head
)
3495 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
3496 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
3499 struct sk_buff
*nskb
= *pp
;
3503 napi_gro_complete(nskb
);
3510 if (NAPI_GRO_CB(skb
)->flush
|| napi
->gro_count
>= MAX_GRO_SKBS
)
3514 NAPI_GRO_CB(skb
)->count
= 1;
3515 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
3516 skb
->next
= napi
->gro_list
;
3517 napi
->gro_list
= skb
;
3521 if (skb_headlen(skb
) < skb_gro_offset(skb
)) {
3522 int grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
3524 BUG_ON(skb
->end
- skb
->tail
< grow
);
3526 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3529 skb
->data_len
-= grow
;
3531 skb_shinfo(skb
)->frags
[0].page_offset
+= grow
;
3532 skb_frag_size_sub(&skb_shinfo(skb
)->frags
[0], grow
);
3534 if (unlikely(!skb_frag_size(&skb_shinfo(skb
)->frags
[0]))) {
3535 skb_frag_unref(skb
, 0);
3536 memmove(skb_shinfo(skb
)->frags
,
3537 skb_shinfo(skb
)->frags
+ 1,
3538 --skb_shinfo(skb
)->nr_frags
* sizeof(skb_frag_t
));
3549 EXPORT_SYMBOL(dev_gro_receive
);
3551 static inline gro_result_t
3552 __napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3555 unsigned int maclen
= skb
->dev
->hard_header_len
;
3557 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3558 unsigned long diffs
;
3560 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
3561 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
3562 if (maclen
== ETH_HLEN
)
3563 diffs
|= compare_ether_header(skb_mac_header(p
),
3564 skb_gro_mac_header(skb
));
3566 diffs
= memcmp(skb_mac_header(p
),
3567 skb_gro_mac_header(skb
),
3569 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
3570 NAPI_GRO_CB(p
)->flush
= 0;
3573 return dev_gro_receive(napi
, skb
);
3576 gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
3580 if (netif_receive_skb(skb
))
3588 case GRO_MERGED_FREE
:
3589 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
3590 kmem_cache_free(skbuff_head_cache
, skb
);
3602 EXPORT_SYMBOL(napi_skb_finish
);
3604 void skb_gro_reset_offset(struct sk_buff
*skb
)
3606 NAPI_GRO_CB(skb
)->data_offset
= 0;
3607 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3608 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3610 if (skb
->mac_header
== skb
->tail
&&
3611 !PageHighMem(skb_frag_page(&skb_shinfo(skb
)->frags
[0]))) {
3612 NAPI_GRO_CB(skb
)->frag0
=
3613 skb_frag_address(&skb_shinfo(skb
)->frags
[0]);
3614 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(&skb_shinfo(skb
)->frags
[0]);
3617 EXPORT_SYMBOL(skb_gro_reset_offset
);
3619 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3621 skb_gro_reset_offset(skb
);
3623 return napi_skb_finish(__napi_gro_receive(napi
, skb
), skb
);
3625 EXPORT_SYMBOL(napi_gro_receive
);
3627 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
3629 __skb_pull(skb
, skb_headlen(skb
));
3630 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3631 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
3633 skb
->dev
= napi
->dev
;
3639 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
3641 struct sk_buff
*skb
= napi
->skb
;
3644 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
3650 EXPORT_SYMBOL(napi_get_frags
);
3652 gro_result_t
napi_frags_finish(struct napi_struct
*napi
, struct sk_buff
*skb
,
3658 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
3660 if (ret
== GRO_HELD
)
3661 skb_gro_pull(skb
, -ETH_HLEN
);
3662 else if (netif_receive_skb(skb
))
3667 case GRO_MERGED_FREE
:
3668 napi_reuse_skb(napi
, skb
);
3677 EXPORT_SYMBOL(napi_frags_finish
);
3679 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
3681 struct sk_buff
*skb
= napi
->skb
;
3688 skb_reset_mac_header(skb
);
3689 skb_gro_reset_offset(skb
);
3691 off
= skb_gro_offset(skb
);
3692 hlen
= off
+ sizeof(*eth
);
3693 eth
= skb_gro_header_fast(skb
, off
);
3694 if (skb_gro_header_hard(skb
, hlen
)) {
3695 eth
= skb_gro_header_slow(skb
, hlen
, off
);
3696 if (unlikely(!eth
)) {
3697 napi_reuse_skb(napi
, skb
);
3703 skb_gro_pull(skb
, sizeof(*eth
));
3706 * This works because the only protocols we care about don't require
3707 * special handling. We'll fix it up properly at the end.
3709 skb
->protocol
= eth
->h_proto
;
3715 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
3717 struct sk_buff
*skb
= napi_frags_skb(napi
);
3722 return napi_frags_finish(napi
, skb
, __napi_gro_receive(napi
, skb
));
3724 EXPORT_SYMBOL(napi_gro_frags
);
3727 * net_rps_action sends any pending IPI's for rps.
3728 * Note: called with local irq disabled, but exits with local irq enabled.
3730 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
3733 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
3736 sd
->rps_ipi_list
= NULL
;
3740 /* Send pending IPI's to kick RPS processing on remote cpus. */
3742 struct softnet_data
*next
= remsd
->rps_ipi_next
;
3744 if (cpu_online(remsd
->cpu
))
3745 __smp_call_function_single(remsd
->cpu
,
3754 static int process_backlog(struct napi_struct
*napi
, int quota
)
3757 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
3760 /* Check if we have pending ipi, its better to send them now,
3761 * not waiting net_rx_action() end.
3763 if (sd
->rps_ipi_list
) {
3764 local_irq_disable();
3765 net_rps_action_and_irq_enable(sd
);
3768 napi
->weight
= weight_p
;
3769 local_irq_disable();
3770 while (work
< quota
) {
3771 struct sk_buff
*skb
;
3774 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
3776 __netif_receive_skb(skb
);
3777 local_irq_disable();
3778 input_queue_head_incr(sd
);
3779 if (++work
>= quota
) {
3786 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3788 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
3789 &sd
->process_queue
);
3791 if (qlen
< quota
- work
) {
3793 * Inline a custom version of __napi_complete().
3794 * only current cpu owns and manipulates this napi,
3795 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3796 * we can use a plain write instead of clear_bit(),
3797 * and we dont need an smp_mb() memory barrier.
3799 list_del(&napi
->poll_list
);
3802 quota
= work
+ qlen
;
3812 * __napi_schedule - schedule for receive
3813 * @n: entry to schedule
3815 * The entry's receive function will be scheduled to run
3817 void __napi_schedule(struct napi_struct
*n
)
3819 unsigned long flags
;
3821 local_irq_save(flags
);
3822 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
3823 local_irq_restore(flags
);
3825 EXPORT_SYMBOL(__napi_schedule
);
3827 void __napi_complete(struct napi_struct
*n
)
3829 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
3830 BUG_ON(n
->gro_list
);
3832 list_del(&n
->poll_list
);
3833 smp_mb__before_clear_bit();
3834 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
3836 EXPORT_SYMBOL(__napi_complete
);
3838 void napi_complete(struct napi_struct
*n
)
3840 unsigned long flags
;
3843 * don't let napi dequeue from the cpu poll list
3844 * just in case its running on a different cpu
3846 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
3850 local_irq_save(flags
);
3852 local_irq_restore(flags
);
3854 EXPORT_SYMBOL(napi_complete
);
3856 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
3857 int (*poll
)(struct napi_struct
*, int), int weight
)
3859 INIT_LIST_HEAD(&napi
->poll_list
);
3860 napi
->gro_count
= 0;
3861 napi
->gro_list
= NULL
;
3864 napi
->weight
= weight
;
3865 list_add(&napi
->dev_list
, &dev
->napi_list
);
3867 #ifdef CONFIG_NETPOLL
3868 spin_lock_init(&napi
->poll_lock
);
3869 napi
->poll_owner
= -1;
3871 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
3873 EXPORT_SYMBOL(netif_napi_add
);
3875 void netif_napi_del(struct napi_struct
*napi
)
3877 struct sk_buff
*skb
, *next
;
3879 list_del_init(&napi
->dev_list
);
3880 napi_free_frags(napi
);
3882 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
3888 napi
->gro_list
= NULL
;
3889 napi
->gro_count
= 0;
3891 EXPORT_SYMBOL(netif_napi_del
);
3893 static void net_rx_action(struct softirq_action
*h
)
3895 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3896 unsigned long time_limit
= jiffies
+ 2;
3897 int budget
= netdev_budget
;
3900 local_irq_disable();
3902 while (!list_empty(&sd
->poll_list
)) {
3903 struct napi_struct
*n
;
3906 /* If softirq window is exhuasted then punt.
3907 * Allow this to run for 2 jiffies since which will allow
3908 * an average latency of 1.5/HZ.
3910 if (unlikely(budget
<= 0 || time_after(jiffies
, time_limit
)))
3915 /* Even though interrupts have been re-enabled, this
3916 * access is safe because interrupts can only add new
3917 * entries to the tail of this list, and only ->poll()
3918 * calls can remove this head entry from the list.
3920 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
3922 have
= netpoll_poll_lock(n
);
3926 /* This NAPI_STATE_SCHED test is for avoiding a race
3927 * with netpoll's poll_napi(). Only the entity which
3928 * obtains the lock and sees NAPI_STATE_SCHED set will
3929 * actually make the ->poll() call. Therefore we avoid
3930 * accidentally calling ->poll() when NAPI is not scheduled.
3933 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
3934 work
= n
->poll(n
, weight
);
3938 WARN_ON_ONCE(work
> weight
);
3942 local_irq_disable();
3944 /* Drivers must not modify the NAPI state if they
3945 * consume the entire weight. In such cases this code
3946 * still "owns" the NAPI instance and therefore can
3947 * move the instance around on the list at-will.
3949 if (unlikely(work
== weight
)) {
3950 if (unlikely(napi_disable_pending(n
))) {
3953 local_irq_disable();
3955 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
3958 netpoll_poll_unlock(have
);
3961 net_rps_action_and_irq_enable(sd
);
3963 #ifdef CONFIG_NET_DMA
3965 * There may not be any more sk_buffs coming right now, so push
3966 * any pending DMA copies to hardware
3968 dma_issue_pending_all();
3975 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3979 static gifconf_func_t
*gifconf_list
[NPROTO
];
3982 * register_gifconf - register a SIOCGIF handler
3983 * @family: Address family
3984 * @gifconf: Function handler
3986 * Register protocol dependent address dumping routines. The handler
3987 * that is passed must not be freed or reused until it has been replaced
3988 * by another handler.
3990 int register_gifconf(unsigned int family
, gifconf_func_t
*gifconf
)
3992 if (family
>= NPROTO
)
3994 gifconf_list
[family
] = gifconf
;
3997 EXPORT_SYMBOL(register_gifconf
);
4001 * Map an interface index to its name (SIOCGIFNAME)
4005 * We need this ioctl for efficient implementation of the
4006 * if_indextoname() function required by the IPv6 API. Without
4007 * it, we would have to search all the interfaces to find a
4011 static int dev_ifname(struct net
*net
, struct ifreq __user
*arg
)
4013 struct net_device
*dev
;
4017 * Fetch the caller's info block.
4020 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
4024 dev
= dev_get_by_index_rcu(net
, ifr
.ifr_ifindex
);
4030 strcpy(ifr
.ifr_name
, dev
->name
);
4033 if (copy_to_user(arg
, &ifr
, sizeof(struct ifreq
)))
4039 * Perform a SIOCGIFCONF call. This structure will change
4040 * size eventually, and there is nothing I can do about it.
4041 * Thus we will need a 'compatibility mode'.
4044 static int dev_ifconf(struct net
*net
, char __user
*arg
)
4047 struct net_device
*dev
;
4054 * Fetch the caller's info block.
4057 if (copy_from_user(&ifc
, arg
, sizeof(struct ifconf
)))
4064 * Loop over the interfaces, and write an info block for each.
4068 for_each_netdev(net
, dev
) {
4069 for (i
= 0; i
< NPROTO
; i
++) {
4070 if (gifconf_list
[i
]) {
4073 done
= gifconf_list
[i
](dev
, NULL
, 0);
4075 done
= gifconf_list
[i
](dev
, pos
+ total
,
4085 * All done. Write the updated control block back to the caller.
4087 ifc
.ifc_len
= total
;
4090 * Both BSD and Solaris return 0 here, so we do too.
4092 return copy_to_user(arg
, &ifc
, sizeof(struct ifconf
)) ? -EFAULT
: 0;
4095 #ifdef CONFIG_PROC_FS
4097 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4099 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4100 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4101 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4103 static inline struct net_device
*dev_from_same_bucket(struct seq_file
*seq
, loff_t
*pos
)
4105 struct net
*net
= seq_file_net(seq
);
4106 struct net_device
*dev
;
4107 struct hlist_node
*p
;
4108 struct hlist_head
*h
;
4109 unsigned int count
= 0, offset
= get_offset(*pos
);
4111 h
= &net
->dev_name_head
[get_bucket(*pos
)];
4112 hlist_for_each_entry_rcu(dev
, p
, h
, name_hlist
) {
4113 if (++count
== offset
)
4120 static inline struct net_device
*dev_from_bucket(struct seq_file
*seq
, loff_t
*pos
)
4122 struct net_device
*dev
;
4123 unsigned int bucket
;
4126 dev
= dev_from_same_bucket(seq
, pos
);
4130 bucket
= get_bucket(*pos
) + 1;
4131 *pos
= set_bucket_offset(bucket
, 1);
4132 } while (bucket
< NETDEV_HASHENTRIES
);
4138 * This is invoked by the /proc filesystem handler to display a device
4141 void *dev_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4146 return SEQ_START_TOKEN
;
4148 if (get_bucket(*pos
) >= NETDEV_HASHENTRIES
)
4151 return dev_from_bucket(seq
, pos
);
4154 void *dev_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4157 return dev_from_bucket(seq
, pos
);
4160 void dev_seq_stop(struct seq_file
*seq
, void *v
)
4166 static void dev_seq_printf_stats(struct seq_file
*seq
, struct net_device
*dev
)
4168 struct rtnl_link_stats64 temp
;
4169 const struct rtnl_link_stats64
*stats
= dev_get_stats(dev
, &temp
);
4171 seq_printf(seq
, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4172 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4173 dev
->name
, stats
->rx_bytes
, stats
->rx_packets
,
4175 stats
->rx_dropped
+ stats
->rx_missed_errors
,
4176 stats
->rx_fifo_errors
,
4177 stats
->rx_length_errors
+ stats
->rx_over_errors
+
4178 stats
->rx_crc_errors
+ stats
->rx_frame_errors
,
4179 stats
->rx_compressed
, stats
->multicast
,
4180 stats
->tx_bytes
, stats
->tx_packets
,
4181 stats
->tx_errors
, stats
->tx_dropped
,
4182 stats
->tx_fifo_errors
, stats
->collisions
,
4183 stats
->tx_carrier_errors
+
4184 stats
->tx_aborted_errors
+
4185 stats
->tx_window_errors
+
4186 stats
->tx_heartbeat_errors
,
4187 stats
->tx_compressed
);
4191 * Called from the PROCfs module. This now uses the new arbitrary sized
4192 * /proc/net interface to create /proc/net/dev
4194 static int dev_seq_show(struct seq_file
*seq
, void *v
)
4196 if (v
== SEQ_START_TOKEN
)
4197 seq_puts(seq
, "Inter-| Receive "
4199 " face |bytes packets errs drop fifo frame "
4200 "compressed multicast|bytes packets errs "
4201 "drop fifo colls carrier compressed\n");
4203 dev_seq_printf_stats(seq
, v
);
4207 static struct softnet_data
*softnet_get_online(loff_t
*pos
)
4209 struct softnet_data
*sd
= NULL
;
4211 while (*pos
< nr_cpu_ids
)
4212 if (cpu_online(*pos
)) {
4213 sd
= &per_cpu(softnet_data
, *pos
);
4220 static void *softnet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4222 return softnet_get_online(pos
);
4225 static void *softnet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4228 return softnet_get_online(pos
);
4231 static void softnet_seq_stop(struct seq_file
*seq
, void *v
)
4235 static int softnet_seq_show(struct seq_file
*seq
, void *v
)
4237 struct softnet_data
*sd
= v
;
4239 seq_printf(seq
, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4240 sd
->processed
, sd
->dropped
, sd
->time_squeeze
, 0,
4241 0, 0, 0, 0, /* was fastroute */
4242 sd
->cpu_collision
, sd
->received_rps
);
4246 static const struct seq_operations dev_seq_ops
= {
4247 .start
= dev_seq_start
,
4248 .next
= dev_seq_next
,
4249 .stop
= dev_seq_stop
,
4250 .show
= dev_seq_show
,
4253 static int dev_seq_open(struct inode
*inode
, struct file
*file
)
4255 return seq_open_net(inode
, file
, &dev_seq_ops
,
4256 sizeof(struct seq_net_private
));
4259 static const struct file_operations dev_seq_fops
= {
4260 .owner
= THIS_MODULE
,
4261 .open
= dev_seq_open
,
4263 .llseek
= seq_lseek
,
4264 .release
= seq_release_net
,
4267 static const struct seq_operations softnet_seq_ops
= {
4268 .start
= softnet_seq_start
,
4269 .next
= softnet_seq_next
,
4270 .stop
= softnet_seq_stop
,
4271 .show
= softnet_seq_show
,
4274 static int softnet_seq_open(struct inode
*inode
, struct file
*file
)
4276 return seq_open(file
, &softnet_seq_ops
);
4279 static const struct file_operations softnet_seq_fops
= {
4280 .owner
= THIS_MODULE
,
4281 .open
= softnet_seq_open
,
4283 .llseek
= seq_lseek
,
4284 .release
= seq_release
,
4287 static void *ptype_get_idx(loff_t pos
)
4289 struct packet_type
*pt
= NULL
;
4293 list_for_each_entry_rcu(pt
, &ptype_all
, list
) {
4299 for (t
= 0; t
< PTYPE_HASH_SIZE
; t
++) {
4300 list_for_each_entry_rcu(pt
, &ptype_base
[t
], list
) {
4309 static void *ptype_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4313 return *pos
? ptype_get_idx(*pos
- 1) : SEQ_START_TOKEN
;
4316 static void *ptype_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4318 struct packet_type
*pt
;
4319 struct list_head
*nxt
;
4323 if (v
== SEQ_START_TOKEN
)
4324 return ptype_get_idx(0);
4327 nxt
= pt
->list
.next
;
4328 if (pt
->type
== htons(ETH_P_ALL
)) {
4329 if (nxt
!= &ptype_all
)
4332 nxt
= ptype_base
[0].next
;
4334 hash
= ntohs(pt
->type
) & PTYPE_HASH_MASK
;
4336 while (nxt
== &ptype_base
[hash
]) {
4337 if (++hash
>= PTYPE_HASH_SIZE
)
4339 nxt
= ptype_base
[hash
].next
;
4342 return list_entry(nxt
, struct packet_type
, list
);
4345 static void ptype_seq_stop(struct seq_file
*seq
, void *v
)
4351 static int ptype_seq_show(struct seq_file
*seq
, void *v
)
4353 struct packet_type
*pt
= v
;
4355 if (v
== SEQ_START_TOKEN
)
4356 seq_puts(seq
, "Type Device Function\n");
4357 else if (pt
->dev
== NULL
|| dev_net(pt
->dev
) == seq_file_net(seq
)) {
4358 if (pt
->type
== htons(ETH_P_ALL
))
4359 seq_puts(seq
, "ALL ");
4361 seq_printf(seq
, "%04x", ntohs(pt
->type
));
4363 seq_printf(seq
, " %-8s %pF\n",
4364 pt
->dev
? pt
->dev
->name
: "", pt
->func
);
4370 static const struct seq_operations ptype_seq_ops
= {
4371 .start
= ptype_seq_start
,
4372 .next
= ptype_seq_next
,
4373 .stop
= ptype_seq_stop
,
4374 .show
= ptype_seq_show
,
4377 static int ptype_seq_open(struct inode
*inode
, struct file
*file
)
4379 return seq_open_net(inode
, file
, &ptype_seq_ops
,
4380 sizeof(struct seq_net_private
));
4383 static const struct file_operations ptype_seq_fops
= {
4384 .owner
= THIS_MODULE
,
4385 .open
= ptype_seq_open
,
4387 .llseek
= seq_lseek
,
4388 .release
= seq_release_net
,
4392 static int __net_init
dev_proc_net_init(struct net
*net
)
4396 if (!proc_net_fops_create(net
, "dev", S_IRUGO
, &dev_seq_fops
))
4398 if (!proc_net_fops_create(net
, "softnet_stat", S_IRUGO
, &softnet_seq_fops
))
4400 if (!proc_net_fops_create(net
, "ptype", S_IRUGO
, &ptype_seq_fops
))
4403 if (wext_proc_init(net
))
4409 proc_net_remove(net
, "ptype");
4411 proc_net_remove(net
, "softnet_stat");
4413 proc_net_remove(net
, "dev");
4417 static void __net_exit
dev_proc_net_exit(struct net
*net
)
4419 wext_proc_exit(net
);
4421 proc_net_remove(net
, "ptype");
4422 proc_net_remove(net
, "softnet_stat");
4423 proc_net_remove(net
, "dev");
4426 static struct pernet_operations __net_initdata dev_proc_ops
= {
4427 .init
= dev_proc_net_init
,
4428 .exit
= dev_proc_net_exit
,
4431 static int __init
dev_proc_init(void)
4433 return register_pernet_subsys(&dev_proc_ops
);
4436 #define dev_proc_init() 0
4437 #endif /* CONFIG_PROC_FS */
4441 * netdev_set_master - set up master pointer
4442 * @slave: slave device
4443 * @master: new master device
4445 * Changes the master device of the slave. Pass %NULL to break the
4446 * bonding. The caller must hold the RTNL semaphore. On a failure
4447 * a negative errno code is returned. On success the reference counts
4448 * are adjusted and the function returns zero.
4450 int netdev_set_master(struct net_device
*slave
, struct net_device
*master
)
4452 struct net_device
*old
= slave
->master
;
4462 slave
->master
= master
;
4468 EXPORT_SYMBOL(netdev_set_master
);
4471 * netdev_set_bond_master - set up bonding master/slave pair
4472 * @slave: slave device
4473 * @master: new master device
4475 * Changes the master device of the slave. Pass %NULL to break the
4476 * bonding. The caller must hold the RTNL semaphore. On a failure
4477 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4478 * to the routing socket and the function returns zero.
4480 int netdev_set_bond_master(struct net_device
*slave
, struct net_device
*master
)
4486 err
= netdev_set_master(slave
, master
);
4490 slave
->flags
|= IFF_SLAVE
;
4492 slave
->flags
&= ~IFF_SLAVE
;
4494 rtmsg_ifinfo(RTM_NEWLINK
, slave
, IFF_SLAVE
);
4497 EXPORT_SYMBOL(netdev_set_bond_master
);
4499 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
4501 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4503 if ((dev
->flags
& IFF_UP
) && ops
->ndo_change_rx_flags
)
4504 ops
->ndo_change_rx_flags(dev
, flags
);
4507 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
)
4509 unsigned int old_flags
= dev
->flags
;
4515 dev
->flags
|= IFF_PROMISC
;
4516 dev
->promiscuity
+= inc
;
4517 if (dev
->promiscuity
== 0) {
4520 * If inc causes overflow, untouch promisc and return error.
4523 dev
->flags
&= ~IFF_PROMISC
;
4525 dev
->promiscuity
-= inc
;
4526 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
4531 if (dev
->flags
!= old_flags
) {
4532 pr_info("device %s %s promiscuous mode\n",
4534 dev
->flags
& IFF_PROMISC
? "entered" : "left");
4535 if (audit_enabled
) {
4536 current_uid_gid(&uid
, &gid
);
4537 audit_log(current
->audit_context
, GFP_ATOMIC
,
4538 AUDIT_ANOM_PROMISCUOUS
,
4539 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4540 dev
->name
, (dev
->flags
& IFF_PROMISC
),
4541 (old_flags
& IFF_PROMISC
),
4542 audit_get_loginuid(current
),
4544 audit_get_sessionid(current
));
4547 dev_change_rx_flags(dev
, IFF_PROMISC
);
4553 * dev_set_promiscuity - update promiscuity count on a device
4557 * Add or remove promiscuity from a device. While the count in the device
4558 * remains above zero the interface remains promiscuous. Once it hits zero
4559 * the device reverts back to normal filtering operation. A negative inc
4560 * value is used to drop promiscuity on the device.
4561 * Return 0 if successful or a negative errno code on error.
4563 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
4565 unsigned int old_flags
= dev
->flags
;
4568 err
= __dev_set_promiscuity(dev
, inc
);
4571 if (dev
->flags
!= old_flags
)
4572 dev_set_rx_mode(dev
);
4575 EXPORT_SYMBOL(dev_set_promiscuity
);
4578 * dev_set_allmulti - update allmulti count on a device
4582 * Add or remove reception of all multicast frames to a device. While the
4583 * count in the device remains above zero the interface remains listening
4584 * to all interfaces. Once it hits zero the device reverts back to normal
4585 * filtering operation. A negative @inc value is used to drop the counter
4586 * when releasing a resource needing all multicasts.
4587 * Return 0 if successful or a negative errno code on error.
4590 int dev_set_allmulti(struct net_device
*dev
, int inc
)
4592 unsigned int old_flags
= dev
->flags
;
4596 dev
->flags
|= IFF_ALLMULTI
;
4597 dev
->allmulti
+= inc
;
4598 if (dev
->allmulti
== 0) {
4601 * If inc causes overflow, untouch allmulti and return error.
4604 dev
->flags
&= ~IFF_ALLMULTI
;
4606 dev
->allmulti
-= inc
;
4607 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
4612 if (dev
->flags
^ old_flags
) {
4613 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
4614 dev_set_rx_mode(dev
);
4618 EXPORT_SYMBOL(dev_set_allmulti
);
4621 * Upload unicast and multicast address lists to device and
4622 * configure RX filtering. When the device doesn't support unicast
4623 * filtering it is put in promiscuous mode while unicast addresses
4626 void __dev_set_rx_mode(struct net_device
*dev
)
4628 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4630 /* dev_open will call this function so the list will stay sane. */
4631 if (!(dev
->flags
&IFF_UP
))
4634 if (!netif_device_present(dev
))
4637 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
4638 /* Unicast addresses changes may only happen under the rtnl,
4639 * therefore calling __dev_set_promiscuity here is safe.
4641 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
4642 __dev_set_promiscuity(dev
, 1);
4643 dev
->uc_promisc
= true;
4644 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
4645 __dev_set_promiscuity(dev
, -1);
4646 dev
->uc_promisc
= false;
4650 if (ops
->ndo_set_rx_mode
)
4651 ops
->ndo_set_rx_mode(dev
);
4654 void dev_set_rx_mode(struct net_device
*dev
)
4656 netif_addr_lock_bh(dev
);
4657 __dev_set_rx_mode(dev
);
4658 netif_addr_unlock_bh(dev
);
4662 * dev_get_flags - get flags reported to userspace
4665 * Get the combination of flag bits exported through APIs to userspace.
4667 unsigned int dev_get_flags(const struct net_device
*dev
)
4671 flags
= (dev
->flags
& ~(IFF_PROMISC
|
4676 (dev
->gflags
& (IFF_PROMISC
|
4679 if (netif_running(dev
)) {
4680 if (netif_oper_up(dev
))
4681 flags
|= IFF_RUNNING
;
4682 if (netif_carrier_ok(dev
))
4683 flags
|= IFF_LOWER_UP
;
4684 if (netif_dormant(dev
))
4685 flags
|= IFF_DORMANT
;
4690 EXPORT_SYMBOL(dev_get_flags
);
4692 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4694 unsigned int old_flags
= dev
->flags
;
4700 * Set the flags on our device.
4703 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
4704 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
4706 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
4710 * Load in the correct multicast list now the flags have changed.
4713 if ((old_flags
^ flags
) & IFF_MULTICAST
)
4714 dev_change_rx_flags(dev
, IFF_MULTICAST
);
4716 dev_set_rx_mode(dev
);
4719 * Have we downed the interface. We handle IFF_UP ourselves
4720 * according to user attempts to set it, rather than blindly
4725 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
4726 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
4729 dev_set_rx_mode(dev
);
4732 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
4733 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
4735 dev
->gflags
^= IFF_PROMISC
;
4736 dev_set_promiscuity(dev
, inc
);
4739 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4740 is important. Some (broken) drivers set IFF_PROMISC, when
4741 IFF_ALLMULTI is requested not asking us and not reporting.
4743 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
4744 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
4746 dev
->gflags
^= IFF_ALLMULTI
;
4747 dev_set_allmulti(dev
, inc
);
4753 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
)
4755 unsigned int changes
= dev
->flags
^ old_flags
;
4757 if (changes
& IFF_UP
) {
4758 if (dev
->flags
& IFF_UP
)
4759 call_netdevice_notifiers(NETDEV_UP
, dev
);
4761 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
4764 if (dev
->flags
& IFF_UP
&&
4765 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
)))
4766 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
4770 * dev_change_flags - change device settings
4772 * @flags: device state flags
4774 * Change settings on device based state flags. The flags are
4775 * in the userspace exported format.
4777 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4780 unsigned int changes
, old_flags
= dev
->flags
;
4782 ret
= __dev_change_flags(dev
, flags
);
4786 changes
= old_flags
^ dev
->flags
;
4788 rtmsg_ifinfo(RTM_NEWLINK
, dev
, changes
);
4790 __dev_notify_flags(dev
, old_flags
);
4793 EXPORT_SYMBOL(dev_change_flags
);
4796 * dev_set_mtu - Change maximum transfer unit
4798 * @new_mtu: new transfer unit
4800 * Change the maximum transfer size of the network device.
4802 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
4804 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4807 if (new_mtu
== dev
->mtu
)
4810 /* MTU must be positive. */
4814 if (!netif_device_present(dev
))
4818 if (ops
->ndo_change_mtu
)
4819 err
= ops
->ndo_change_mtu(dev
, new_mtu
);
4823 if (!err
&& dev
->flags
& IFF_UP
)
4824 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
4827 EXPORT_SYMBOL(dev_set_mtu
);
4830 * dev_set_group - Change group this device belongs to
4832 * @new_group: group this device should belong to
4834 void dev_set_group(struct net_device
*dev
, int new_group
)
4836 dev
->group
= new_group
;
4838 EXPORT_SYMBOL(dev_set_group
);
4841 * dev_set_mac_address - Change Media Access Control Address
4845 * Change the hardware (MAC) address of the device
4847 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
4849 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4852 if (!ops
->ndo_set_mac_address
)
4854 if (sa
->sa_family
!= dev
->type
)
4856 if (!netif_device_present(dev
))
4858 err
= ops
->ndo_set_mac_address(dev
, sa
);
4860 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4861 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
4864 EXPORT_SYMBOL(dev_set_mac_address
);
4867 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4869 static int dev_ifsioc_locked(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4872 struct net_device
*dev
= dev_get_by_name_rcu(net
, ifr
->ifr_name
);
4878 case SIOCGIFFLAGS
: /* Get interface flags */
4879 ifr
->ifr_flags
= (short) dev_get_flags(dev
);
4882 case SIOCGIFMETRIC
: /* Get the metric on the interface
4883 (currently unused) */
4884 ifr
->ifr_metric
= 0;
4887 case SIOCGIFMTU
: /* Get the MTU of a device */
4888 ifr
->ifr_mtu
= dev
->mtu
;
4893 memset(ifr
->ifr_hwaddr
.sa_data
, 0, sizeof ifr
->ifr_hwaddr
.sa_data
);
4895 memcpy(ifr
->ifr_hwaddr
.sa_data
, dev
->dev_addr
,
4896 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
4897 ifr
->ifr_hwaddr
.sa_family
= dev
->type
;
4905 ifr
->ifr_map
.mem_start
= dev
->mem_start
;
4906 ifr
->ifr_map
.mem_end
= dev
->mem_end
;
4907 ifr
->ifr_map
.base_addr
= dev
->base_addr
;
4908 ifr
->ifr_map
.irq
= dev
->irq
;
4909 ifr
->ifr_map
.dma
= dev
->dma
;
4910 ifr
->ifr_map
.port
= dev
->if_port
;
4914 ifr
->ifr_ifindex
= dev
->ifindex
;
4918 ifr
->ifr_qlen
= dev
->tx_queue_len
;
4922 /* dev_ioctl() should ensure this case
4934 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4936 static int dev_ifsioc(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4939 struct net_device
*dev
= __dev_get_by_name(net
, ifr
->ifr_name
);
4940 const struct net_device_ops
*ops
;
4945 ops
= dev
->netdev_ops
;
4948 case SIOCSIFFLAGS
: /* Set interface flags */
4949 return dev_change_flags(dev
, ifr
->ifr_flags
);
4951 case SIOCSIFMETRIC
: /* Set the metric on the interface
4952 (currently unused) */
4955 case SIOCSIFMTU
: /* Set the MTU of a device */
4956 return dev_set_mtu(dev
, ifr
->ifr_mtu
);
4959 return dev_set_mac_address(dev
, &ifr
->ifr_hwaddr
);
4961 case SIOCSIFHWBROADCAST
:
4962 if (ifr
->ifr_hwaddr
.sa_family
!= dev
->type
)
4964 memcpy(dev
->broadcast
, ifr
->ifr_hwaddr
.sa_data
,
4965 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
4966 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4970 if (ops
->ndo_set_config
) {
4971 if (!netif_device_present(dev
))
4973 return ops
->ndo_set_config(dev
, &ifr
->ifr_map
);
4978 if (!ops
->ndo_set_rx_mode
||
4979 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
4981 if (!netif_device_present(dev
))
4983 return dev_mc_add_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
4986 if (!ops
->ndo_set_rx_mode
||
4987 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
4989 if (!netif_device_present(dev
))
4991 return dev_mc_del_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
4994 if (ifr
->ifr_qlen
< 0)
4996 dev
->tx_queue_len
= ifr
->ifr_qlen
;
5000 ifr
->ifr_newname
[IFNAMSIZ
-1] = '\0';
5001 return dev_change_name(dev
, ifr
->ifr_newname
);
5004 err
= net_hwtstamp_validate(ifr
);
5010 * Unknown or private ioctl
5013 if ((cmd
>= SIOCDEVPRIVATE
&&
5014 cmd
<= SIOCDEVPRIVATE
+ 15) ||
5015 cmd
== SIOCBONDENSLAVE
||
5016 cmd
== SIOCBONDRELEASE
||
5017 cmd
== SIOCBONDSETHWADDR
||
5018 cmd
== SIOCBONDSLAVEINFOQUERY
||
5019 cmd
== SIOCBONDINFOQUERY
||
5020 cmd
== SIOCBONDCHANGEACTIVE
||
5021 cmd
== SIOCGMIIPHY
||
5022 cmd
== SIOCGMIIREG
||
5023 cmd
== SIOCSMIIREG
||
5024 cmd
== SIOCBRADDIF
||
5025 cmd
== SIOCBRDELIF
||
5026 cmd
== SIOCSHWTSTAMP
||
5027 cmd
== SIOCWANDEV
) {
5029 if (ops
->ndo_do_ioctl
) {
5030 if (netif_device_present(dev
))
5031 err
= ops
->ndo_do_ioctl(dev
, ifr
, cmd
);
5043 * This function handles all "interface"-type I/O control requests. The actual
5044 * 'doing' part of this is dev_ifsioc above.
5048 * dev_ioctl - network device ioctl
5049 * @net: the applicable net namespace
5050 * @cmd: command to issue
5051 * @arg: pointer to a struct ifreq in user space
5053 * Issue ioctl functions to devices. This is normally called by the
5054 * user space syscall interfaces but can sometimes be useful for
5055 * other purposes. The return value is the return from the syscall if
5056 * positive or a negative errno code on error.
5059 int dev_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
5065 /* One special case: SIOCGIFCONF takes ifconf argument
5066 and requires shared lock, because it sleeps writing
5070 if (cmd
== SIOCGIFCONF
) {
5072 ret
= dev_ifconf(net
, (char __user
*) arg
);
5076 if (cmd
== SIOCGIFNAME
)
5077 return dev_ifname(net
, (struct ifreq __user
*)arg
);
5079 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
5082 ifr
.ifr_name
[IFNAMSIZ
-1] = 0;
5084 colon
= strchr(ifr
.ifr_name
, ':');
5089 * See which interface the caller is talking about.
5094 * These ioctl calls:
5095 * - can be done by all.
5096 * - atomic and do not require locking.
5107 dev_load(net
, ifr
.ifr_name
);
5109 ret
= dev_ifsioc_locked(net
, &ifr
, cmd
);
5114 if (copy_to_user(arg
, &ifr
,
5115 sizeof(struct ifreq
)))
5121 dev_load(net
, ifr
.ifr_name
);
5123 ret
= dev_ethtool(net
, &ifr
);
5128 if (copy_to_user(arg
, &ifr
,
5129 sizeof(struct ifreq
)))
5135 * These ioctl calls:
5136 * - require superuser power.
5137 * - require strict serialization.
5143 if (!capable(CAP_NET_ADMIN
))
5145 dev_load(net
, ifr
.ifr_name
);
5147 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5152 if (copy_to_user(arg
, &ifr
,
5153 sizeof(struct ifreq
)))
5159 * These ioctl calls:
5160 * - require superuser power.
5161 * - require strict serialization.
5162 * - do not return a value
5172 case SIOCSIFHWBROADCAST
:
5175 case SIOCBONDENSLAVE
:
5176 case SIOCBONDRELEASE
:
5177 case SIOCBONDSETHWADDR
:
5178 case SIOCBONDCHANGEACTIVE
:
5182 if (!capable(CAP_NET_ADMIN
))
5185 case SIOCBONDSLAVEINFOQUERY
:
5186 case SIOCBONDINFOQUERY
:
5187 dev_load(net
, ifr
.ifr_name
);
5189 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5194 /* Get the per device memory space. We can add this but
5195 * currently do not support it */
5197 /* Set the per device memory buffer space.
5198 * Not applicable in our case */
5203 * Unknown or private ioctl.
5206 if (cmd
== SIOCWANDEV
||
5207 (cmd
>= SIOCDEVPRIVATE
&&
5208 cmd
<= SIOCDEVPRIVATE
+ 15)) {
5209 dev_load(net
, ifr
.ifr_name
);
5211 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5213 if (!ret
&& copy_to_user(arg
, &ifr
,
5214 sizeof(struct ifreq
)))
5218 /* Take care of Wireless Extensions */
5219 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
)
5220 return wext_handle_ioctl(net
, &ifr
, cmd
, arg
);
5227 * dev_new_index - allocate an ifindex
5228 * @net: the applicable net namespace
5230 * Returns a suitable unique value for a new device interface
5231 * number. The caller must hold the rtnl semaphore or the
5232 * dev_base_lock to be sure it remains unique.
5234 static int dev_new_index(struct net
*net
)
5236 int ifindex
= net
->ifindex
;
5240 if (!__dev_get_by_index(net
, ifindex
))
5241 return net
->ifindex
= ifindex
;
5245 /* Delayed registration/unregisteration */
5246 static LIST_HEAD(net_todo_list
);
5248 static void net_set_todo(struct net_device
*dev
)
5250 list_add_tail(&dev
->todo_list
, &net_todo_list
);
5253 static void rollback_registered_many(struct list_head
*head
)
5255 struct net_device
*dev
, *tmp
;
5257 BUG_ON(dev_boot_phase
);
5260 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
5261 /* Some devices call without registering
5262 * for initialization unwind. Remove those
5263 * devices and proceed with the remaining.
5265 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5266 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5270 list_del(&dev
->unreg_list
);
5273 dev
->dismantle
= true;
5274 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
5277 /* If device is running, close it first. */
5278 dev_close_many(head
);
5280 list_for_each_entry(dev
, head
, unreg_list
) {
5281 /* And unlink it from device chain. */
5282 unlist_netdevice(dev
);
5284 dev
->reg_state
= NETREG_UNREGISTERING
;
5289 list_for_each_entry(dev
, head
, unreg_list
) {
5290 /* Shutdown queueing discipline. */
5294 /* Notify protocols, that we are about to destroy
5295 this device. They should clean all the things.
5297 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5299 if (!dev
->rtnl_link_ops
||
5300 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5301 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
5304 * Flush the unicast and multicast chains
5309 if (dev
->netdev_ops
->ndo_uninit
)
5310 dev
->netdev_ops
->ndo_uninit(dev
);
5312 /* Notifier chain MUST detach us from master device. */
5313 WARN_ON(dev
->master
);
5315 /* Remove entries from kobject tree */
5316 netdev_unregister_kobject(dev
);
5319 /* Process any work delayed until the end of the batch */
5320 dev
= list_first_entry(head
, struct net_device
, unreg_list
);
5321 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH
, dev
);
5325 list_for_each_entry(dev
, head
, unreg_list
)
5329 static void rollback_registered(struct net_device
*dev
)
5333 list_add(&dev
->unreg_list
, &single
);
5334 rollback_registered_many(&single
);
5338 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
5339 netdev_features_t features
)
5341 /* Fix illegal checksum combinations */
5342 if ((features
& NETIF_F_HW_CSUM
) &&
5343 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5344 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
5345 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
5348 /* Fix illegal SG+CSUM combinations. */
5349 if ((features
& NETIF_F_SG
) &&
5350 !(features
& NETIF_F_ALL_CSUM
)) {
5352 "Dropping NETIF_F_SG since no checksum feature.\n");
5353 features
&= ~NETIF_F_SG
;
5356 /* TSO requires that SG is present as well. */
5357 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
5358 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
5359 features
&= ~NETIF_F_ALL_TSO
;
5362 /* TSO ECN requires that TSO is present as well. */
5363 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
5364 features
&= ~NETIF_F_TSO_ECN
;
5366 /* Software GSO depends on SG. */
5367 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
5368 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
5369 features
&= ~NETIF_F_GSO
;
5372 /* UFO needs SG and checksumming */
5373 if (features
& NETIF_F_UFO
) {
5374 /* maybe split UFO into V4 and V6? */
5375 if (!((features
& NETIF_F_GEN_CSUM
) ||
5376 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
5377 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5379 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5380 features
&= ~NETIF_F_UFO
;
5383 if (!(features
& NETIF_F_SG
)) {
5385 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5386 features
&= ~NETIF_F_UFO
;
5393 int __netdev_update_features(struct net_device
*dev
)
5395 netdev_features_t features
;
5400 features
= netdev_get_wanted_features(dev
);
5402 if (dev
->netdev_ops
->ndo_fix_features
)
5403 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
5405 /* driver might be less strict about feature dependencies */
5406 features
= netdev_fix_features(dev
, features
);
5408 if (dev
->features
== features
)
5411 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
5412 &dev
->features
, &features
);
5414 if (dev
->netdev_ops
->ndo_set_features
)
5415 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
5417 if (unlikely(err
< 0)) {
5419 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5420 err
, &features
, &dev
->features
);
5425 dev
->features
= features
;
5431 * netdev_update_features - recalculate device features
5432 * @dev: the device to check
5434 * Recalculate dev->features set and send notifications if it
5435 * has changed. Should be called after driver or hardware dependent
5436 * conditions might have changed that influence the features.
5438 void netdev_update_features(struct net_device
*dev
)
5440 if (__netdev_update_features(dev
))
5441 netdev_features_change(dev
);
5443 EXPORT_SYMBOL(netdev_update_features
);
5446 * netdev_change_features - recalculate device features
5447 * @dev: the device to check
5449 * Recalculate dev->features set and send notifications even
5450 * if they have not changed. Should be called instead of
5451 * netdev_update_features() if also dev->vlan_features might
5452 * have changed to allow the changes to be propagated to stacked
5455 void netdev_change_features(struct net_device
*dev
)
5457 __netdev_update_features(dev
);
5458 netdev_features_change(dev
);
5460 EXPORT_SYMBOL(netdev_change_features
);
5463 * netif_stacked_transfer_operstate - transfer operstate
5464 * @rootdev: the root or lower level device to transfer state from
5465 * @dev: the device to transfer operstate to
5467 * Transfer operational state from root to device. This is normally
5468 * called when a stacking relationship exists between the root
5469 * device and the device(a leaf device).
5471 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
5472 struct net_device
*dev
)
5474 if (rootdev
->operstate
== IF_OPER_DORMANT
)
5475 netif_dormant_on(dev
);
5477 netif_dormant_off(dev
);
5479 if (netif_carrier_ok(rootdev
)) {
5480 if (!netif_carrier_ok(dev
))
5481 netif_carrier_on(dev
);
5483 if (netif_carrier_ok(dev
))
5484 netif_carrier_off(dev
);
5487 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
5490 static int netif_alloc_rx_queues(struct net_device
*dev
)
5492 unsigned int i
, count
= dev
->num_rx_queues
;
5493 struct netdev_rx_queue
*rx
;
5497 rx
= kcalloc(count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5499 pr_err("netdev: Unable to allocate %u rx queues\n", count
);
5504 for (i
= 0; i
< count
; i
++)
5510 static void netdev_init_one_queue(struct net_device
*dev
,
5511 struct netdev_queue
*queue
, void *_unused
)
5513 /* Initialize queue lock */
5514 spin_lock_init(&queue
->_xmit_lock
);
5515 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
5516 queue
->xmit_lock_owner
= -1;
5517 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
5520 dql_init(&queue
->dql
, HZ
);
5524 static int netif_alloc_netdev_queues(struct net_device
*dev
)
5526 unsigned int count
= dev
->num_tx_queues
;
5527 struct netdev_queue
*tx
;
5531 tx
= kcalloc(count
, sizeof(struct netdev_queue
), GFP_KERNEL
);
5533 pr_err("netdev: Unable to allocate %u tx queues\n", count
);
5538 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
5539 spin_lock_init(&dev
->tx_global_lock
);
5545 * register_netdevice - register a network device
5546 * @dev: device to register
5548 * Take a completed network device structure and add it to the kernel
5549 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5550 * chain. 0 is returned on success. A negative errno code is returned
5551 * on a failure to set up the device, or if the name is a duplicate.
5553 * Callers must hold the rtnl semaphore. You may want
5554 * register_netdev() instead of this.
5557 * The locking appears insufficient to guarantee two parallel registers
5558 * will not get the same name.
5561 int register_netdevice(struct net_device
*dev
)
5564 struct net
*net
= dev_net(dev
);
5566 BUG_ON(dev_boot_phase
);
5571 /* When net_device's are persistent, this will be fatal. */
5572 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
5575 spin_lock_init(&dev
->addr_list_lock
);
5576 netdev_set_addr_lockdep_class(dev
);
5580 ret
= dev_get_valid_name(dev
, dev
->name
);
5584 /* Init, if this function is available */
5585 if (dev
->netdev_ops
->ndo_init
) {
5586 ret
= dev
->netdev_ops
->ndo_init(dev
);
5596 dev
->ifindex
= dev_new_index(net
);
5597 else if (__dev_get_by_index(net
, dev
->ifindex
))
5600 if (dev
->iflink
== -1)
5601 dev
->iflink
= dev
->ifindex
;
5603 /* Transfer changeable features to wanted_features and enable
5604 * software offloads (GSO and GRO).
5606 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
5607 dev
->features
|= NETIF_F_SOFT_FEATURES
;
5608 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
5610 /* Turn on no cache copy if HW is doing checksum */
5611 if (!(dev
->flags
& IFF_LOOPBACK
)) {
5612 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
5613 if (dev
->features
& NETIF_F_ALL_CSUM
) {
5614 dev
->wanted_features
|= NETIF_F_NOCACHE_COPY
;
5615 dev
->features
|= NETIF_F_NOCACHE_COPY
;
5619 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5621 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
5623 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
5624 ret
= notifier_to_errno(ret
);
5628 ret
= netdev_register_kobject(dev
);
5631 dev
->reg_state
= NETREG_REGISTERED
;
5633 __netdev_update_features(dev
);
5636 * Default initial state at registry is that the
5637 * device is present.
5640 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5642 dev_init_scheduler(dev
);
5644 list_netdevice(dev
);
5645 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5647 /* Notify protocols, that a new device appeared. */
5648 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5649 ret
= notifier_to_errno(ret
);
5651 rollback_registered(dev
);
5652 dev
->reg_state
= NETREG_UNREGISTERED
;
5655 * Prevent userspace races by waiting until the network
5656 * device is fully setup before sending notifications.
5658 if (!dev
->rtnl_link_ops
||
5659 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5660 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
5666 if (dev
->netdev_ops
->ndo_uninit
)
5667 dev
->netdev_ops
->ndo_uninit(dev
);
5670 EXPORT_SYMBOL(register_netdevice
);
5673 * init_dummy_netdev - init a dummy network device for NAPI
5674 * @dev: device to init
5676 * This takes a network device structure and initialize the minimum
5677 * amount of fields so it can be used to schedule NAPI polls without
5678 * registering a full blown interface. This is to be used by drivers
5679 * that need to tie several hardware interfaces to a single NAPI
5680 * poll scheduler due to HW limitations.
5682 int init_dummy_netdev(struct net_device
*dev
)
5684 /* Clear everything. Note we don't initialize spinlocks
5685 * are they aren't supposed to be taken by any of the
5686 * NAPI code and this dummy netdev is supposed to be
5687 * only ever used for NAPI polls
5689 memset(dev
, 0, sizeof(struct net_device
));
5691 /* make sure we BUG if trying to hit standard
5692 * register/unregister code path
5694 dev
->reg_state
= NETREG_DUMMY
;
5696 /* NAPI wants this */
5697 INIT_LIST_HEAD(&dev
->napi_list
);
5699 /* a dummy interface is started by default */
5700 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5701 set_bit(__LINK_STATE_START
, &dev
->state
);
5703 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5704 * because users of this 'device' dont need to change
5710 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
5714 * register_netdev - register a network device
5715 * @dev: device to register
5717 * Take a completed network device structure and add it to the kernel
5718 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5719 * chain. 0 is returned on success. A negative errno code is returned
5720 * on a failure to set up the device, or if the name is a duplicate.
5722 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5723 * and expands the device name if you passed a format string to
5726 int register_netdev(struct net_device
*dev
)
5731 err
= register_netdevice(dev
);
5735 EXPORT_SYMBOL(register_netdev
);
5737 int netdev_refcnt_read(const struct net_device
*dev
)
5741 for_each_possible_cpu(i
)
5742 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
5745 EXPORT_SYMBOL(netdev_refcnt_read
);
5748 * netdev_wait_allrefs - wait until all references are gone.
5750 * This is called when unregistering network devices.
5752 * Any protocol or device that holds a reference should register
5753 * for netdevice notification, and cleanup and put back the
5754 * reference if they receive an UNREGISTER event.
5755 * We can get stuck here if buggy protocols don't correctly
5758 static void netdev_wait_allrefs(struct net_device
*dev
)
5760 unsigned long rebroadcast_time
, warning_time
;
5763 linkwatch_forget_dev(dev
);
5765 rebroadcast_time
= warning_time
= jiffies
;
5766 refcnt
= netdev_refcnt_read(dev
);
5768 while (refcnt
!= 0) {
5769 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
5772 /* Rebroadcast unregister notification */
5773 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5774 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5775 * should have already handle it the first time */
5777 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
5779 /* We must not have linkwatch events
5780 * pending on unregister. If this
5781 * happens, we simply run the queue
5782 * unscheduled, resulting in a noop
5785 linkwatch_run_queue();
5790 rebroadcast_time
= jiffies
;
5795 refcnt
= netdev_refcnt_read(dev
);
5797 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
5798 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
5800 warning_time
= jiffies
;
5809 * register_netdevice(x1);
5810 * register_netdevice(x2);
5812 * unregister_netdevice(y1);
5813 * unregister_netdevice(y2);
5819 * We are invoked by rtnl_unlock().
5820 * This allows us to deal with problems:
5821 * 1) We can delete sysfs objects which invoke hotplug
5822 * without deadlocking with linkwatch via keventd.
5823 * 2) Since we run with the RTNL semaphore not held, we can sleep
5824 * safely in order to wait for the netdev refcnt to drop to zero.
5826 * We must not return until all unregister events added during
5827 * the interval the lock was held have been completed.
5829 void netdev_run_todo(void)
5831 struct list_head list
;
5833 /* Snapshot list, allow later requests */
5834 list_replace_init(&net_todo_list
, &list
);
5838 /* Wait for rcu callbacks to finish before attempting to drain
5839 * the device list. This usually avoids a 250ms wait.
5841 if (!list_empty(&list
))
5844 while (!list_empty(&list
)) {
5845 struct net_device
*dev
5846 = list_first_entry(&list
, struct net_device
, todo_list
);
5847 list_del(&dev
->todo_list
);
5849 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
5850 pr_err("network todo '%s' but state %d\n",
5851 dev
->name
, dev
->reg_state
);
5856 dev
->reg_state
= NETREG_UNREGISTERED
;
5858 on_each_cpu(flush_backlog
, dev
, 1);
5860 netdev_wait_allrefs(dev
);
5863 BUG_ON(netdev_refcnt_read(dev
));
5864 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
5865 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
5866 WARN_ON(dev
->dn_ptr
);
5868 if (dev
->destructor
)
5869 dev
->destructor(dev
);
5871 /* Free network device */
5872 kobject_put(&dev
->dev
.kobj
);
5876 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5877 * fields in the same order, with only the type differing.
5879 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
5880 const struct net_device_stats
*netdev_stats
)
5882 #if BITS_PER_LONG == 64
5883 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
5884 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
5886 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
5887 const unsigned long *src
= (const unsigned long *)netdev_stats
;
5888 u64
*dst
= (u64
*)stats64
;
5890 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
5891 sizeof(*stats64
) / sizeof(u64
));
5892 for (i
= 0; i
< n
; i
++)
5896 EXPORT_SYMBOL(netdev_stats_to_stats64
);
5899 * dev_get_stats - get network device statistics
5900 * @dev: device to get statistics from
5901 * @storage: place to store stats
5903 * Get network statistics from device. Return @storage.
5904 * The device driver may provide its own method by setting
5905 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5906 * otherwise the internal statistics structure is used.
5908 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
5909 struct rtnl_link_stats64
*storage
)
5911 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5913 if (ops
->ndo_get_stats64
) {
5914 memset(storage
, 0, sizeof(*storage
));
5915 ops
->ndo_get_stats64(dev
, storage
);
5916 } else if (ops
->ndo_get_stats
) {
5917 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
5919 netdev_stats_to_stats64(storage
, &dev
->stats
);
5921 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
5924 EXPORT_SYMBOL(dev_get_stats
);
5926 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
5928 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
5930 #ifdef CONFIG_NET_CLS_ACT
5933 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
5936 netdev_init_one_queue(dev
, queue
, NULL
);
5937 queue
->qdisc
= &noop_qdisc
;
5938 queue
->qdisc_sleeping
= &noop_qdisc
;
5939 rcu_assign_pointer(dev
->ingress_queue
, queue
);
5945 * alloc_netdev_mqs - allocate network device
5946 * @sizeof_priv: size of private data to allocate space for
5947 * @name: device name format string
5948 * @setup: callback to initialize device
5949 * @txqs: the number of TX subqueues to allocate
5950 * @rxqs: the number of RX subqueues to allocate
5952 * Allocates a struct net_device with private data area for driver use
5953 * and performs basic initialization. Also allocates subquue structs
5954 * for each queue on the device.
5956 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
5957 void (*setup
)(struct net_device
*),
5958 unsigned int txqs
, unsigned int rxqs
)
5960 struct net_device
*dev
;
5962 struct net_device
*p
;
5964 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
5967 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
5973 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
5978 alloc_size
= sizeof(struct net_device
);
5980 /* ensure 32-byte alignment of private area */
5981 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
5982 alloc_size
+= sizeof_priv
;
5984 /* ensure 32-byte alignment of whole construct */
5985 alloc_size
+= NETDEV_ALIGN
- 1;
5987 p
= kzalloc(alloc_size
, GFP_KERNEL
);
5989 pr_err("alloc_netdev: Unable to allocate device\n");
5993 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
5994 dev
->padded
= (char *)dev
- (char *)p
;
5996 dev
->pcpu_refcnt
= alloc_percpu(int);
5997 if (!dev
->pcpu_refcnt
)
6000 if (dev_addr_init(dev
))
6006 dev_net_set(dev
, &init_net
);
6008 dev
->gso_max_size
= GSO_MAX_SIZE
;
6009 dev
->gso_max_segs
= GSO_MAX_SEGS
;
6011 INIT_LIST_HEAD(&dev
->napi_list
);
6012 INIT_LIST_HEAD(&dev
->unreg_list
);
6013 INIT_LIST_HEAD(&dev
->link_watch_list
);
6014 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
6017 dev
->num_tx_queues
= txqs
;
6018 dev
->real_num_tx_queues
= txqs
;
6019 if (netif_alloc_netdev_queues(dev
))
6023 dev
->num_rx_queues
= rxqs
;
6024 dev
->real_num_rx_queues
= rxqs
;
6025 if (netif_alloc_rx_queues(dev
))
6029 strcpy(dev
->name
, name
);
6030 dev
->group
= INIT_NETDEV_GROUP
;
6038 free_percpu(dev
->pcpu_refcnt
);
6048 EXPORT_SYMBOL(alloc_netdev_mqs
);
6051 * free_netdev - free network device
6054 * This function does the last stage of destroying an allocated device
6055 * interface. The reference to the device object is released.
6056 * If this is the last reference then it will be freed.
6058 void free_netdev(struct net_device
*dev
)
6060 struct napi_struct
*p
, *n
;
6062 release_net(dev_net(dev
));
6069 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
6071 /* Flush device addresses */
6072 dev_addr_flush(dev
);
6074 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
6077 free_percpu(dev
->pcpu_refcnt
);
6078 dev
->pcpu_refcnt
= NULL
;
6080 /* Compatibility with error handling in drivers */
6081 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6082 kfree((char *)dev
- dev
->padded
);
6086 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
6087 dev
->reg_state
= NETREG_RELEASED
;
6089 /* will free via device release */
6090 put_device(&dev
->dev
);
6092 EXPORT_SYMBOL(free_netdev
);
6095 * synchronize_net - Synchronize with packet receive processing
6097 * Wait for packets currently being received to be done.
6098 * Does not block later packets from starting.
6100 void synchronize_net(void)
6103 if (rtnl_is_locked())
6104 synchronize_rcu_expedited();
6108 EXPORT_SYMBOL(synchronize_net
);
6111 * unregister_netdevice_queue - remove device from the kernel
6115 * This function shuts down a device interface and removes it
6116 * from the kernel tables.
6117 * If head not NULL, device is queued to be unregistered later.
6119 * Callers must hold the rtnl semaphore. You may want
6120 * unregister_netdev() instead of this.
6123 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
6128 list_move_tail(&dev
->unreg_list
, head
);
6130 rollback_registered(dev
);
6131 /* Finish processing unregister after unlock */
6135 EXPORT_SYMBOL(unregister_netdevice_queue
);
6138 * unregister_netdevice_many - unregister many devices
6139 * @head: list of devices
6141 void unregister_netdevice_many(struct list_head
*head
)
6143 struct net_device
*dev
;
6145 if (!list_empty(head
)) {
6146 rollback_registered_many(head
);
6147 list_for_each_entry(dev
, head
, unreg_list
)
6151 EXPORT_SYMBOL(unregister_netdevice_many
);
6154 * unregister_netdev - remove device from the kernel
6157 * This function shuts down a device interface and removes it
6158 * from the kernel tables.
6160 * This is just a wrapper for unregister_netdevice that takes
6161 * the rtnl semaphore. In general you want to use this and not
6162 * unregister_netdevice.
6164 void unregister_netdev(struct net_device
*dev
)
6167 unregister_netdevice(dev
);
6170 EXPORT_SYMBOL(unregister_netdev
);
6173 * dev_change_net_namespace - move device to different nethost namespace
6175 * @net: network namespace
6176 * @pat: If not NULL name pattern to try if the current device name
6177 * is already taken in the destination network namespace.
6179 * This function shuts down a device interface and moves it
6180 * to a new network namespace. On success 0 is returned, on
6181 * a failure a netagive errno code is returned.
6183 * Callers must hold the rtnl semaphore.
6186 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
6192 /* Don't allow namespace local devices to be moved. */
6194 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6197 /* Ensure the device has been registrered */
6199 if (dev
->reg_state
!= NETREG_REGISTERED
)
6202 /* Get out if there is nothing todo */
6204 if (net_eq(dev_net(dev
), net
))
6207 /* Pick the destination device name, and ensure
6208 * we can use it in the destination network namespace.
6211 if (__dev_get_by_name(net
, dev
->name
)) {
6212 /* We get here if we can't use the current device name */
6215 if (dev_get_valid_name(dev
, pat
) < 0)
6220 * And now a mini version of register_netdevice unregister_netdevice.
6223 /* If device is running close it first. */
6226 /* And unlink it from device chain */
6228 unlist_netdevice(dev
);
6232 /* Shutdown queueing discipline. */
6235 /* Notify protocols, that we are about to destroy
6236 this device. They should clean all the things.
6238 Note that dev->reg_state stays at NETREG_REGISTERED.
6239 This is wanted because this way 8021q and macvlan know
6240 the device is just moving and can keep their slaves up.
6242 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6243 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH
, dev
);
6244 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
6247 * Flush the unicast and multicast chains
6252 /* Actually switch the network namespace */
6253 dev_net_set(dev
, net
);
6255 /* If there is an ifindex conflict assign a new one */
6256 if (__dev_get_by_index(net
, dev
->ifindex
)) {
6257 int iflink
= (dev
->iflink
== dev
->ifindex
);
6258 dev
->ifindex
= dev_new_index(net
);
6260 dev
->iflink
= dev
->ifindex
;
6263 /* Fixup kobjects */
6264 err
= device_rename(&dev
->dev
, dev
->name
);
6267 /* Add the device back in the hashes */
6268 list_netdevice(dev
);
6270 /* Notify protocols, that a new device appeared. */
6271 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6274 * Prevent userspace races by waiting until the network
6275 * device is fully setup before sending notifications.
6277 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
6284 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
6286 static int dev_cpu_callback(struct notifier_block
*nfb
,
6287 unsigned long action
,
6290 struct sk_buff
**list_skb
;
6291 struct sk_buff
*skb
;
6292 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
6293 struct softnet_data
*sd
, *oldsd
;
6295 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
6298 local_irq_disable();
6299 cpu
= smp_processor_id();
6300 sd
= &per_cpu(softnet_data
, cpu
);
6301 oldsd
= &per_cpu(softnet_data
, oldcpu
);
6303 /* Find end of our completion_queue. */
6304 list_skb
= &sd
->completion_queue
;
6306 list_skb
= &(*list_skb
)->next
;
6307 /* Append completion queue from offline CPU. */
6308 *list_skb
= oldsd
->completion_queue
;
6309 oldsd
->completion_queue
= NULL
;
6311 /* Append output queue from offline CPU. */
6312 if (oldsd
->output_queue
) {
6313 *sd
->output_queue_tailp
= oldsd
->output_queue
;
6314 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
6315 oldsd
->output_queue
= NULL
;
6316 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
6318 /* Append NAPI poll list from offline CPU. */
6319 if (!list_empty(&oldsd
->poll_list
)) {
6320 list_splice_init(&oldsd
->poll_list
, &sd
->poll_list
);
6321 raise_softirq_irqoff(NET_RX_SOFTIRQ
);
6324 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
6327 /* Process offline CPU's input_pkt_queue */
6328 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
6330 input_queue_head_incr(oldsd
);
6332 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
6334 input_queue_head_incr(oldsd
);
6342 * netdev_increment_features - increment feature set by one
6343 * @all: current feature set
6344 * @one: new feature set
6345 * @mask: mask feature set
6347 * Computes a new feature set after adding a device with feature set
6348 * @one to the master device with current feature set @all. Will not
6349 * enable anything that is off in @mask. Returns the new feature set.
6351 netdev_features_t
netdev_increment_features(netdev_features_t all
,
6352 netdev_features_t one
, netdev_features_t mask
)
6354 if (mask
& NETIF_F_GEN_CSUM
)
6355 mask
|= NETIF_F_ALL_CSUM
;
6356 mask
|= NETIF_F_VLAN_CHALLENGED
;
6358 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
6359 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
6361 /* If one device supports hw checksumming, set for all. */
6362 if (all
& NETIF_F_GEN_CSUM
)
6363 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
6367 EXPORT_SYMBOL(netdev_increment_features
);
6369 static struct hlist_head
*netdev_create_hash(void)
6372 struct hlist_head
*hash
;
6374 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
6376 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
6377 INIT_HLIST_HEAD(&hash
[i
]);
6382 /* Initialize per network namespace state */
6383 static int __net_init
netdev_init(struct net
*net
)
6385 if (net
!= &init_net
)
6386 INIT_LIST_HEAD(&net
->dev_base_head
);
6388 net
->dev_name_head
= netdev_create_hash();
6389 if (net
->dev_name_head
== NULL
)
6392 net
->dev_index_head
= netdev_create_hash();
6393 if (net
->dev_index_head
== NULL
)
6399 kfree(net
->dev_name_head
);
6405 * netdev_drivername - network driver for the device
6406 * @dev: network device
6408 * Determine network driver for device.
6410 const char *netdev_drivername(const struct net_device
*dev
)
6412 const struct device_driver
*driver
;
6413 const struct device
*parent
;
6414 const char *empty
= "";
6416 parent
= dev
->dev
.parent
;
6420 driver
= parent
->driver
;
6421 if (driver
&& driver
->name
)
6422 return driver
->name
;
6426 int __netdev_printk(const char *level
, const struct net_device
*dev
,
6427 struct va_format
*vaf
)
6431 if (dev
&& dev
->dev
.parent
)
6432 r
= dev_printk(level
, dev
->dev
.parent
, "%s: %pV",
6433 netdev_name(dev
), vaf
);
6435 r
= printk("%s%s: %pV", level
, netdev_name(dev
), vaf
);
6437 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
6441 EXPORT_SYMBOL(__netdev_printk
);
6443 int netdev_printk(const char *level
, const struct net_device
*dev
,
6444 const char *format
, ...)
6446 struct va_format vaf
;
6450 va_start(args
, format
);
6455 r
= __netdev_printk(level
, dev
, &vaf
);
6460 EXPORT_SYMBOL(netdev_printk
);
6462 #define define_netdev_printk_level(func, level) \
6463 int func(const struct net_device *dev, const char *fmt, ...) \
6466 struct va_format vaf; \
6469 va_start(args, fmt); \
6474 r = __netdev_printk(level, dev, &vaf); \
6479 EXPORT_SYMBOL(func);
6481 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
6482 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
6483 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
6484 define_netdev_printk_level(netdev_err
, KERN_ERR
);
6485 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
6486 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
6487 define_netdev_printk_level(netdev_info
, KERN_INFO
);
6489 static void __net_exit
netdev_exit(struct net
*net
)
6491 kfree(net
->dev_name_head
);
6492 kfree(net
->dev_index_head
);
6495 static struct pernet_operations __net_initdata netdev_net_ops
= {
6496 .init
= netdev_init
,
6497 .exit
= netdev_exit
,
6500 static void __net_exit
default_device_exit(struct net
*net
)
6502 struct net_device
*dev
, *aux
;
6504 * Push all migratable network devices back to the
6505 * initial network namespace
6508 for_each_netdev_safe(net
, dev
, aux
) {
6510 char fb_name
[IFNAMSIZ
];
6512 /* Ignore unmoveable devices (i.e. loopback) */
6513 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6516 /* Leave virtual devices for the generic cleanup */
6517 if (dev
->rtnl_link_ops
)
6520 /* Push remaining network devices to init_net */
6521 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
6522 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
6524 pr_emerg("%s: failed to move %s to init_net: %d\n",
6525 __func__
, dev
->name
, err
);
6532 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
6534 /* At exit all network devices most be removed from a network
6535 * namespace. Do this in the reverse order of registration.
6536 * Do this across as many network namespaces as possible to
6537 * improve batching efficiency.
6539 struct net_device
*dev
;
6541 LIST_HEAD(dev_kill_list
);
6544 list_for_each_entry(net
, net_list
, exit_list
) {
6545 for_each_netdev_reverse(net
, dev
) {
6546 if (dev
->rtnl_link_ops
)
6547 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
6549 unregister_netdevice_queue(dev
, &dev_kill_list
);
6552 unregister_netdevice_many(&dev_kill_list
);
6553 list_del(&dev_kill_list
);
6557 static struct pernet_operations __net_initdata default_device_ops
= {
6558 .exit
= default_device_exit
,
6559 .exit_batch
= default_device_exit_batch
,
6563 * Initialize the DEV module. At boot time this walks the device list and
6564 * unhooks any devices that fail to initialise (normally hardware not
6565 * present) and leaves us with a valid list of present and active devices.
6570 * This is called single threaded during boot, so no need
6571 * to take the rtnl semaphore.
6573 static int __init
net_dev_init(void)
6575 int i
, rc
= -ENOMEM
;
6577 BUG_ON(!dev_boot_phase
);
6579 if (dev_proc_init())
6582 if (netdev_kobject_init())
6585 INIT_LIST_HEAD(&ptype_all
);
6586 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
6587 INIT_LIST_HEAD(&ptype_base
[i
]);
6589 if (register_pernet_subsys(&netdev_net_ops
))
6593 * Initialise the packet receive queues.
6596 for_each_possible_cpu(i
) {
6597 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
6599 memset(sd
, 0, sizeof(*sd
));
6600 skb_queue_head_init(&sd
->input_pkt_queue
);
6601 skb_queue_head_init(&sd
->process_queue
);
6602 sd
->completion_queue
= NULL
;
6603 INIT_LIST_HEAD(&sd
->poll_list
);
6604 sd
->output_queue
= NULL
;
6605 sd
->output_queue_tailp
= &sd
->output_queue
;
6607 sd
->csd
.func
= rps_trigger_softirq
;
6613 sd
->backlog
.poll
= process_backlog
;
6614 sd
->backlog
.weight
= weight_p
;
6615 sd
->backlog
.gro_list
= NULL
;
6616 sd
->backlog
.gro_count
= 0;
6621 /* The loopback device is special if any other network devices
6622 * is present in a network namespace the loopback device must
6623 * be present. Since we now dynamically allocate and free the
6624 * loopback device ensure this invariant is maintained by
6625 * keeping the loopback device as the first device on the
6626 * list of network devices. Ensuring the loopback devices
6627 * is the first device that appears and the last network device
6630 if (register_pernet_device(&loopback_net_ops
))
6633 if (register_pernet_device(&default_device_ops
))
6636 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
6637 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
6639 hotcpu_notifier(dev_cpu_callback
, 0);
6647 subsys_initcall(net_dev_init
);
6649 static int __init
initialize_hashrnd(void)
6651 get_random_bytes(&hashrnd
, sizeof(hashrnd
));
6655 late_initcall_sync(initialize_hashrnd
);