2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <net/net_namespace.h>
99 #include <linux/rtnetlink.h>
100 #include <linux/proc_fs.h>
101 #include <linux/seq_file.h>
102 #include <linux/stat.h>
104 #include <net/pkt_sched.h>
105 #include <net/checksum.h>
106 #include <net/xfrm.h>
107 #include <linux/highmem.h>
108 #include <linux/init.h>
109 #include <linux/kmod.h>
110 #include <linux/module.h>
111 #include <linux/netpoll.h>
112 #include <linux/rcupdate.h>
113 #include <linux/delay.h>
114 #include <net/wext.h>
115 #include <net/iw_handler.h>
116 #include <asm/current.h>
117 #include <linux/audit.h>
118 #include <linux/dmaengine.h>
119 #include <linux/err.h>
120 #include <linux/ctype.h>
121 #include <linux/if_arp.h>
122 #include <linux/if_vlan.h>
123 #include <linux/ip.h>
125 #include <linux/ipv6.h>
126 #include <linux/in.h>
127 #include <linux/jhash.h>
128 #include <linux/random.h>
129 #include <trace/events/napi.h>
130 #include <trace/events/net.h>
131 #include <trace/events/skb.h>
132 #include <linux/pci.h>
133 #include <linux/inetdevice.h>
134 #include <linux/cpu_rmap.h>
135 #include <linux/net_tstamp.h>
136 #include <linux/static_key.h>
137 #include <net/flow_keys.h>
139 #include "net-sysfs.h"
141 /* Instead of increasing this, you should create a hash table. */
142 #define MAX_GRO_SKBS 8
144 /* This should be increased if a protocol with a bigger head is added. */
145 #define GRO_MAX_HEAD (MAX_HEADER + 128)
148 * The list of packet types we will receive (as opposed to discard)
149 * and the routines to invoke.
151 * Why 16. Because with 16 the only overlap we get on a hash of the
152 * low nibble of the protocol value is RARP/SNAP/X.25.
154 * NOTE: That is no longer true with the addition of VLAN tags. Not
155 * sure which should go first, but I bet it won't make much
156 * difference if we are running VLANs. The good news is that
157 * this protocol won't be in the list unless compiled in, so
158 * the average user (w/out VLANs) will not be adversely affected.
175 #define PTYPE_HASH_SIZE (16)
176 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
178 static DEFINE_SPINLOCK(ptype_lock
);
179 static struct list_head ptype_base
[PTYPE_HASH_SIZE
] __read_mostly
;
180 static struct list_head ptype_all __read_mostly
; /* Taps */
183 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
186 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
188 * Writers must hold the rtnl semaphore while they loop through the
189 * dev_base_head list, and hold dev_base_lock for writing when they do the
190 * actual updates. This allows pure readers to access the list even
191 * while a writer is preparing to update it.
193 * To put it another way, dev_base_lock is held for writing only to
194 * protect against pure readers; the rtnl semaphore provides the
195 * protection against other writers.
197 * See, for example usages, register_netdevice() and
198 * unregister_netdevice(), which must be called with the rtnl
201 DEFINE_RWLOCK(dev_base_lock
);
202 EXPORT_SYMBOL(dev_base_lock
);
204 static inline void dev_base_seq_inc(struct net
*net
)
206 while (++net
->dev_base_seq
== 0);
209 static inline struct hlist_head
*dev_name_hash(struct net
*net
, const char *name
)
211 unsigned int hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
213 return &net
->dev_name_head
[hash_32(hash
, NETDEV_HASHBITS
)];
216 static inline struct hlist_head
*dev_index_hash(struct net
*net
, int ifindex
)
218 return &net
->dev_index_head
[ifindex
& (NETDEV_HASHENTRIES
- 1)];
221 static inline void rps_lock(struct softnet_data
*sd
)
224 spin_lock(&sd
->input_pkt_queue
.lock
);
228 static inline void rps_unlock(struct softnet_data
*sd
)
231 spin_unlock(&sd
->input_pkt_queue
.lock
);
235 /* Device list insertion */
236 static int list_netdevice(struct net_device
*dev
)
238 struct net
*net
= dev_net(dev
);
242 write_lock_bh(&dev_base_lock
);
243 list_add_tail_rcu(&dev
->dev_list
, &net
->dev_base_head
);
244 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
245 hlist_add_head_rcu(&dev
->index_hlist
,
246 dev_index_hash(net
, dev
->ifindex
));
247 write_unlock_bh(&dev_base_lock
);
249 dev_base_seq_inc(net
);
254 /* Device list removal
255 * caller must respect a RCU grace period before freeing/reusing dev
257 static void unlist_netdevice(struct net_device
*dev
)
261 /* Unlink dev from the device chain */
262 write_lock_bh(&dev_base_lock
);
263 list_del_rcu(&dev
->dev_list
);
264 hlist_del_rcu(&dev
->name_hlist
);
265 hlist_del_rcu(&dev
->index_hlist
);
266 write_unlock_bh(&dev_base_lock
);
268 dev_base_seq_inc(dev_net(dev
));
275 static RAW_NOTIFIER_HEAD(netdev_chain
);
278 * Device drivers call our routines to queue packets here. We empty the
279 * queue in the local softnet handler.
282 DEFINE_PER_CPU_ALIGNED(struct softnet_data
, softnet_data
);
283 EXPORT_PER_CPU_SYMBOL(softnet_data
);
285 #ifdef CONFIG_LOCKDEP
287 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
288 * according to dev->type
290 static const unsigned short netdev_lock_type
[] =
291 {ARPHRD_NETROM
, ARPHRD_ETHER
, ARPHRD_EETHER
, ARPHRD_AX25
,
292 ARPHRD_PRONET
, ARPHRD_CHAOS
, ARPHRD_IEEE802
, ARPHRD_ARCNET
,
293 ARPHRD_APPLETLK
, ARPHRD_DLCI
, ARPHRD_ATM
, ARPHRD_METRICOM
,
294 ARPHRD_IEEE1394
, ARPHRD_EUI64
, ARPHRD_INFINIBAND
, ARPHRD_SLIP
,
295 ARPHRD_CSLIP
, ARPHRD_SLIP6
, ARPHRD_CSLIP6
, ARPHRD_RSRVD
,
296 ARPHRD_ADAPT
, ARPHRD_ROSE
, ARPHRD_X25
, ARPHRD_HWX25
,
297 ARPHRD_PPP
, ARPHRD_CISCO
, ARPHRD_LAPB
, ARPHRD_DDCMP
,
298 ARPHRD_RAWHDLC
, ARPHRD_TUNNEL
, ARPHRD_TUNNEL6
, ARPHRD_FRAD
,
299 ARPHRD_SKIP
, ARPHRD_LOOPBACK
, ARPHRD_LOCALTLK
, ARPHRD_FDDI
,
300 ARPHRD_BIF
, ARPHRD_SIT
, ARPHRD_IPDDP
, ARPHRD_IPGRE
,
301 ARPHRD_PIMREG
, ARPHRD_HIPPI
, ARPHRD_ASH
, ARPHRD_ECONET
,
302 ARPHRD_IRDA
, ARPHRD_FCPP
, ARPHRD_FCAL
, ARPHRD_FCPL
,
303 ARPHRD_FCFABRIC
, ARPHRD_IEEE80211
, ARPHRD_IEEE80211_PRISM
,
304 ARPHRD_IEEE80211_RADIOTAP
, ARPHRD_PHONET
, ARPHRD_PHONET_PIPE
,
305 ARPHRD_IEEE802154
, ARPHRD_VOID
, ARPHRD_NONE
};
307 static const char *const netdev_lock_name
[] =
308 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
309 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
310 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
311 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
312 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
313 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
314 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
315 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
316 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
317 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
318 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
319 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
320 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
321 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
322 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
324 static struct lock_class_key netdev_xmit_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
325 static struct lock_class_key netdev_addr_lock_key
[ARRAY_SIZE(netdev_lock_type
)];
327 static inline unsigned short netdev_lock_pos(unsigned short dev_type
)
331 for (i
= 0; i
< ARRAY_SIZE(netdev_lock_type
); i
++)
332 if (netdev_lock_type
[i
] == dev_type
)
334 /* the last key is used by default */
335 return ARRAY_SIZE(netdev_lock_type
) - 1;
338 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
339 unsigned short dev_type
)
343 i
= netdev_lock_pos(dev_type
);
344 lockdep_set_class_and_name(lock
, &netdev_xmit_lock_key
[i
],
345 netdev_lock_name
[i
]);
348 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
352 i
= netdev_lock_pos(dev
->type
);
353 lockdep_set_class_and_name(&dev
->addr_list_lock
,
354 &netdev_addr_lock_key
[i
],
355 netdev_lock_name
[i
]);
358 static inline void netdev_set_xmit_lockdep_class(spinlock_t
*lock
,
359 unsigned short dev_type
)
362 static inline void netdev_set_addr_lockdep_class(struct net_device
*dev
)
367 /*******************************************************************************
369 Protocol management and registration routines
371 *******************************************************************************/
374 * Add a protocol ID to the list. Now that the input handler is
375 * smarter we can dispense with all the messy stuff that used to be
378 * BEWARE!!! Protocol handlers, mangling input packets,
379 * MUST BE last in hash buckets and checking protocol handlers
380 * MUST start from promiscuous ptype_all chain in net_bh.
381 * It is true now, do not change it.
382 * Explanation follows: if protocol handler, mangling packet, will
383 * be the first on list, it is not able to sense, that packet
384 * is cloned and should be copied-on-write, so that it will
385 * change it and subsequent readers will get broken packet.
389 static inline struct list_head
*ptype_head(const struct packet_type
*pt
)
391 if (pt
->type
== htons(ETH_P_ALL
))
394 return &ptype_base
[ntohs(pt
->type
) & PTYPE_HASH_MASK
];
398 * dev_add_pack - add packet handler
399 * @pt: packet type declaration
401 * Add a protocol handler to the networking stack. The passed &packet_type
402 * is linked into kernel lists and may not be freed until it has been
403 * removed from the kernel lists.
405 * This call does not sleep therefore it can not
406 * guarantee all CPU's that are in middle of receiving packets
407 * will see the new packet type (until the next received packet).
410 void dev_add_pack(struct packet_type
*pt
)
412 struct list_head
*head
= ptype_head(pt
);
414 spin_lock(&ptype_lock
);
415 list_add_rcu(&pt
->list
, head
);
416 spin_unlock(&ptype_lock
);
418 EXPORT_SYMBOL(dev_add_pack
);
421 * __dev_remove_pack - remove packet handler
422 * @pt: packet type declaration
424 * Remove a protocol handler that was previously added to the kernel
425 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
426 * from the kernel lists and can be freed or reused once this function
429 * The packet type might still be in use by receivers
430 * and must not be freed until after all the CPU's have gone
431 * through a quiescent state.
433 void __dev_remove_pack(struct packet_type
*pt
)
435 struct list_head
*head
= ptype_head(pt
);
436 struct packet_type
*pt1
;
438 spin_lock(&ptype_lock
);
440 list_for_each_entry(pt1
, head
, list
) {
442 list_del_rcu(&pt
->list
);
447 pr_warn("dev_remove_pack: %p not found\n", pt
);
449 spin_unlock(&ptype_lock
);
451 EXPORT_SYMBOL(__dev_remove_pack
);
454 * dev_remove_pack - remove packet handler
455 * @pt: packet type declaration
457 * Remove a protocol handler that was previously added to the kernel
458 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
459 * from the kernel lists and can be freed or reused once this function
462 * This call sleeps to guarantee that no CPU is looking at the packet
465 void dev_remove_pack(struct packet_type
*pt
)
467 __dev_remove_pack(pt
);
471 EXPORT_SYMBOL(dev_remove_pack
);
473 /******************************************************************************
475 Device Boot-time Settings Routines
477 *******************************************************************************/
479 /* Boot time configuration table */
480 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
483 * netdev_boot_setup_add - add new setup entry
484 * @name: name of the device
485 * @map: configured settings for the device
487 * Adds new setup entry to the dev_boot_setup list. The function
488 * returns 0 on error and 1 on success. This is a generic routine to
491 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
493 struct netdev_boot_setup
*s
;
497 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
498 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
499 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
500 strlcpy(s
[i
].name
, name
, IFNAMSIZ
);
501 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
506 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
510 * netdev_boot_setup_check - check boot time settings
511 * @dev: the netdevice
513 * Check boot time settings for the device.
514 * The found settings are set for the device to be used
515 * later in the device probing.
516 * Returns 0 if no settings found, 1 if they are.
518 int netdev_boot_setup_check(struct net_device
*dev
)
520 struct netdev_boot_setup
*s
= dev_boot_setup
;
523 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
524 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
525 !strcmp(dev
->name
, s
[i
].name
)) {
526 dev
->irq
= s
[i
].map
.irq
;
527 dev
->base_addr
= s
[i
].map
.base_addr
;
528 dev
->mem_start
= s
[i
].map
.mem_start
;
529 dev
->mem_end
= s
[i
].map
.mem_end
;
535 EXPORT_SYMBOL(netdev_boot_setup_check
);
539 * netdev_boot_base - get address from boot time settings
540 * @prefix: prefix for network device
541 * @unit: id for network device
543 * Check boot time settings for the base address of device.
544 * The found settings are set for the device to be used
545 * later in the device probing.
546 * Returns 0 if no settings found.
548 unsigned long netdev_boot_base(const char *prefix
, int unit
)
550 const struct netdev_boot_setup
*s
= dev_boot_setup
;
554 sprintf(name
, "%s%d", prefix
, unit
);
557 * If device already registered then return base of 1
558 * to indicate not to probe for this interface
560 if (__dev_get_by_name(&init_net
, name
))
563 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
564 if (!strcmp(name
, s
[i
].name
))
565 return s
[i
].map
.base_addr
;
570 * Saves at boot time configured settings for any netdevice.
572 int __init
netdev_boot_setup(char *str
)
577 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
582 memset(&map
, 0, sizeof(map
));
586 map
.base_addr
= ints
[2];
588 map
.mem_start
= ints
[3];
590 map
.mem_end
= ints
[4];
592 /* Add new entry to the list */
593 return netdev_boot_setup_add(str
, &map
);
596 __setup("netdev=", netdev_boot_setup
);
598 /*******************************************************************************
600 Device Interface Subroutines
602 *******************************************************************************/
605 * __dev_get_by_name - find a device by its name
606 * @net: the applicable net namespace
607 * @name: name to find
609 * Find an interface by name. Must be called under RTNL semaphore
610 * or @dev_base_lock. If the name is found a pointer to the device
611 * is returned. If the name is not found then %NULL is returned. The
612 * reference counters are not incremented so the caller must be
613 * careful with locks.
616 struct net_device
*__dev_get_by_name(struct net
*net
, const char *name
)
618 struct hlist_node
*p
;
619 struct net_device
*dev
;
620 struct hlist_head
*head
= dev_name_hash(net
, name
);
622 hlist_for_each_entry(dev
, p
, head
, name_hlist
)
623 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
628 EXPORT_SYMBOL(__dev_get_by_name
);
631 * dev_get_by_name_rcu - find a device by its name
632 * @net: the applicable net namespace
633 * @name: name to find
635 * Find an interface by name.
636 * If the name is found a pointer to the device is returned.
637 * If the name is not found then %NULL is returned.
638 * The reference counters are not incremented so the caller must be
639 * careful with locks. The caller must hold RCU lock.
642 struct net_device
*dev_get_by_name_rcu(struct net
*net
, const char *name
)
644 struct hlist_node
*p
;
645 struct net_device
*dev
;
646 struct hlist_head
*head
= dev_name_hash(net
, name
);
648 hlist_for_each_entry_rcu(dev
, p
, head
, name_hlist
)
649 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
654 EXPORT_SYMBOL(dev_get_by_name_rcu
);
657 * dev_get_by_name - find a device by its name
658 * @net: the applicable net namespace
659 * @name: name to find
661 * Find an interface by name. This can be called from any
662 * context and does its own locking. The returned handle has
663 * the usage count incremented and the caller must use dev_put() to
664 * release it when it is no longer needed. %NULL is returned if no
665 * matching device is found.
668 struct net_device
*dev_get_by_name(struct net
*net
, const char *name
)
670 struct net_device
*dev
;
673 dev
= dev_get_by_name_rcu(net
, name
);
679 EXPORT_SYMBOL(dev_get_by_name
);
682 * __dev_get_by_index - find a device by its ifindex
683 * @net: the applicable net namespace
684 * @ifindex: index of device
686 * Search for an interface by index. Returns %NULL if the device
687 * is not found or a pointer to the device. The device has not
688 * had its reference counter increased so the caller must be careful
689 * about locking. The caller must hold either the RTNL semaphore
693 struct net_device
*__dev_get_by_index(struct net
*net
, int ifindex
)
695 struct hlist_node
*p
;
696 struct net_device
*dev
;
697 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
699 hlist_for_each_entry(dev
, p
, head
, index_hlist
)
700 if (dev
->ifindex
== ifindex
)
705 EXPORT_SYMBOL(__dev_get_by_index
);
708 * dev_get_by_index_rcu - find a device by its ifindex
709 * @net: the applicable net namespace
710 * @ifindex: index of device
712 * Search for an interface by index. Returns %NULL if the device
713 * is not found or a pointer to the device. The device has not
714 * had its reference counter increased so the caller must be careful
715 * about locking. The caller must hold RCU lock.
718 struct net_device
*dev_get_by_index_rcu(struct net
*net
, int ifindex
)
720 struct hlist_node
*p
;
721 struct net_device
*dev
;
722 struct hlist_head
*head
= dev_index_hash(net
, ifindex
);
724 hlist_for_each_entry_rcu(dev
, p
, head
, index_hlist
)
725 if (dev
->ifindex
== ifindex
)
730 EXPORT_SYMBOL(dev_get_by_index_rcu
);
734 * dev_get_by_index - find a device by its ifindex
735 * @net: the applicable net namespace
736 * @ifindex: index of device
738 * Search for an interface by index. Returns NULL if the device
739 * is not found or a pointer to the device. The device returned has
740 * had a reference added and the pointer is safe until the user calls
741 * dev_put to indicate they have finished with it.
744 struct net_device
*dev_get_by_index(struct net
*net
, int ifindex
)
746 struct net_device
*dev
;
749 dev
= dev_get_by_index_rcu(net
, ifindex
);
755 EXPORT_SYMBOL(dev_get_by_index
);
758 * dev_getbyhwaddr_rcu - find a device by its hardware address
759 * @net: the applicable net namespace
760 * @type: media type of device
761 * @ha: hardware address
763 * Search for an interface by MAC address. Returns NULL if the device
764 * is not found or a pointer to the device.
765 * The caller must hold RCU or RTNL.
766 * The returned device has not had its ref count increased
767 * and the caller must therefore be careful about locking
771 struct net_device
*dev_getbyhwaddr_rcu(struct net
*net
, unsigned short type
,
774 struct net_device
*dev
;
776 for_each_netdev_rcu(net
, dev
)
777 if (dev
->type
== type
&&
778 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
783 EXPORT_SYMBOL(dev_getbyhwaddr_rcu
);
785 struct net_device
*__dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
787 struct net_device
*dev
;
790 for_each_netdev(net
, dev
)
791 if (dev
->type
== type
)
796 EXPORT_SYMBOL(__dev_getfirstbyhwtype
);
798 struct net_device
*dev_getfirstbyhwtype(struct net
*net
, unsigned short type
)
800 struct net_device
*dev
, *ret
= NULL
;
803 for_each_netdev_rcu(net
, dev
)
804 if (dev
->type
== type
) {
812 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
815 * dev_get_by_flags_rcu - find any device with given flags
816 * @net: the applicable net namespace
817 * @if_flags: IFF_* values
818 * @mask: bitmask of bits in if_flags to check
820 * Search for any interface with the given flags. Returns NULL if a device
821 * is not found or a pointer to the device. Must be called inside
822 * rcu_read_lock(), and result refcount is unchanged.
825 struct net_device
*dev_get_by_flags_rcu(struct net
*net
, unsigned short if_flags
,
828 struct net_device
*dev
, *ret
;
831 for_each_netdev_rcu(net
, dev
) {
832 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
839 EXPORT_SYMBOL(dev_get_by_flags_rcu
);
842 * dev_valid_name - check if name is okay for network device
845 * Network device names need to be valid file names to
846 * to allow sysfs to work. We also disallow any kind of
849 bool dev_valid_name(const char *name
)
853 if (strlen(name
) >= IFNAMSIZ
)
855 if (!strcmp(name
, ".") || !strcmp(name
, ".."))
859 if (*name
== '/' || isspace(*name
))
865 EXPORT_SYMBOL(dev_valid_name
);
868 * __dev_alloc_name - allocate a name for a device
869 * @net: network namespace to allocate the device name in
870 * @name: name format string
871 * @buf: scratch buffer and result name string
873 * Passed a format string - eg "lt%d" it will try and find a suitable
874 * id. It scans list of devices to build up a free map, then chooses
875 * the first empty slot. The caller must hold the dev_base or rtnl lock
876 * while allocating the name and adding the device in order to avoid
878 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
879 * Returns the number of the unit assigned or a negative errno code.
882 static int __dev_alloc_name(struct net
*net
, const char *name
, char *buf
)
886 const int max_netdevices
= 8*PAGE_SIZE
;
887 unsigned long *inuse
;
888 struct net_device
*d
;
890 p
= strnchr(name
, IFNAMSIZ
-1, '%');
893 * Verify the string as this thing may have come from
894 * the user. There must be either one "%d" and no other "%"
897 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
900 /* Use one page as a bit array of possible slots */
901 inuse
= (unsigned long *) get_zeroed_page(GFP_ATOMIC
);
905 for_each_netdev(net
, d
) {
906 if (!sscanf(d
->name
, name
, &i
))
908 if (i
< 0 || i
>= max_netdevices
)
911 /* avoid cases where sscanf is not exact inverse of printf */
912 snprintf(buf
, IFNAMSIZ
, name
, i
);
913 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
917 i
= find_first_zero_bit(inuse
, max_netdevices
);
918 free_page((unsigned long) inuse
);
922 snprintf(buf
, IFNAMSIZ
, name
, i
);
923 if (!__dev_get_by_name(net
, buf
))
926 /* It is possible to run out of possible slots
927 * when the name is long and there isn't enough space left
928 * for the digits, or if all bits are used.
934 * dev_alloc_name - allocate a name for a device
936 * @name: name format string
938 * Passed a format string - eg "lt%d" it will try and find a suitable
939 * id. It scans list of devices to build up a free map, then chooses
940 * the first empty slot. The caller must hold the dev_base or rtnl lock
941 * while allocating the name and adding the device in order to avoid
943 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
944 * Returns the number of the unit assigned or a negative errno code.
947 int dev_alloc_name(struct net_device
*dev
, const char *name
)
953 BUG_ON(!dev_net(dev
));
955 ret
= __dev_alloc_name(net
, name
, buf
);
957 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
960 EXPORT_SYMBOL(dev_alloc_name
);
962 static int dev_get_valid_name(struct net_device
*dev
, const char *name
)
966 BUG_ON(!dev_net(dev
));
969 if (!dev_valid_name(name
))
972 if (strchr(name
, '%'))
973 return dev_alloc_name(dev
, name
);
974 else if (__dev_get_by_name(net
, name
))
976 else if (dev
->name
!= name
)
977 strlcpy(dev
->name
, name
, IFNAMSIZ
);
983 * dev_change_name - change name of a device
985 * @newname: name (or format string) must be at least IFNAMSIZ
987 * Change name of a device, can pass format strings "eth%d".
990 int dev_change_name(struct net_device
*dev
, const char *newname
)
992 char oldname
[IFNAMSIZ
];
998 BUG_ON(!dev_net(dev
));
1001 if (dev
->flags
& IFF_UP
)
1004 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0)
1007 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1009 err
= dev_get_valid_name(dev
, newname
);
1014 ret
= device_rename(&dev
->dev
, dev
->name
);
1016 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1020 write_lock_bh(&dev_base_lock
);
1021 hlist_del_rcu(&dev
->name_hlist
);
1022 write_unlock_bh(&dev_base_lock
);
1026 write_lock_bh(&dev_base_lock
);
1027 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1028 write_unlock_bh(&dev_base_lock
);
1030 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1031 ret
= notifier_to_errno(ret
);
1034 /* err >= 0 after dev_alloc_name() or stores the first errno */
1037 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1040 pr_err("%s: name change rollback failed: %d\n",
1049 * dev_set_alias - change ifalias of a device
1051 * @alias: name up to IFALIASZ
1052 * @len: limit of bytes to copy from info
1054 * Set ifalias for a device,
1056 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1062 if (len
>= IFALIASZ
)
1067 kfree(dev
->ifalias
);
1068 dev
->ifalias
= NULL
;
1073 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1076 dev
->ifalias
= new_ifalias
;
1078 strlcpy(dev
->ifalias
, alias
, len
+1);
1084 * netdev_features_change - device changes features
1085 * @dev: device to cause notification
1087 * Called to indicate a device has changed features.
1089 void netdev_features_change(struct net_device
*dev
)
1091 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1093 EXPORT_SYMBOL(netdev_features_change
);
1096 * netdev_state_change - device changes state
1097 * @dev: device to cause notification
1099 * Called to indicate a device has changed state. This function calls
1100 * the notifier chains for netdev_chain and sends a NEWLINK message
1101 * to the routing socket.
1103 void netdev_state_change(struct net_device
*dev
)
1105 if (dev
->flags
& IFF_UP
) {
1106 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
1107 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0);
1110 EXPORT_SYMBOL(netdev_state_change
);
1112 int netdev_bonding_change(struct net_device
*dev
, unsigned long event
)
1114 return call_netdevice_notifiers(event
, dev
);
1116 EXPORT_SYMBOL(netdev_bonding_change
);
1119 * dev_load - load a network module
1120 * @net: the applicable net namespace
1121 * @name: name of interface
1123 * If a network interface is not present and the process has suitable
1124 * privileges this function loads the module. If module loading is not
1125 * available in this kernel then it becomes a nop.
1128 void dev_load(struct net
*net
, const char *name
)
1130 struct net_device
*dev
;
1134 dev
= dev_get_by_name_rcu(net
, name
);
1138 if (no_module
&& capable(CAP_NET_ADMIN
))
1139 no_module
= request_module("netdev-%s", name
);
1140 if (no_module
&& capable(CAP_SYS_MODULE
)) {
1141 if (!request_module("%s", name
))
1142 pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
1146 EXPORT_SYMBOL(dev_load
);
1148 static int __dev_open(struct net_device
*dev
)
1150 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1155 if (!netif_device_present(dev
))
1158 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1159 ret
= notifier_to_errno(ret
);
1163 set_bit(__LINK_STATE_START
, &dev
->state
);
1165 if (ops
->ndo_validate_addr
)
1166 ret
= ops
->ndo_validate_addr(dev
);
1168 if (!ret
&& ops
->ndo_open
)
1169 ret
= ops
->ndo_open(dev
);
1172 clear_bit(__LINK_STATE_START
, &dev
->state
);
1174 dev
->flags
|= IFF_UP
;
1175 net_dmaengine_get();
1176 dev_set_rx_mode(dev
);
1178 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1185 * dev_open - prepare an interface for use.
1186 * @dev: device to open
1188 * Takes a device from down to up state. The device's private open
1189 * function is invoked and then the multicast lists are loaded. Finally
1190 * the device is moved into the up state and a %NETDEV_UP message is
1191 * sent to the netdev notifier chain.
1193 * Calling this function on an active interface is a nop. On a failure
1194 * a negative errno code is returned.
1196 int dev_open(struct net_device
*dev
)
1200 if (dev
->flags
& IFF_UP
)
1203 ret
= __dev_open(dev
);
1207 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1208 call_netdevice_notifiers(NETDEV_UP
, dev
);
1212 EXPORT_SYMBOL(dev_open
);
1214 static int __dev_close_many(struct list_head
*head
)
1216 struct net_device
*dev
;
1221 list_for_each_entry(dev
, head
, unreg_list
) {
1222 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1224 clear_bit(__LINK_STATE_START
, &dev
->state
);
1226 /* Synchronize to scheduled poll. We cannot touch poll list, it
1227 * can be even on different cpu. So just clear netif_running().
1229 * dev->stop() will invoke napi_disable() on all of it's
1230 * napi_struct instances on this device.
1232 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1235 dev_deactivate_many(head
);
1237 list_for_each_entry(dev
, head
, unreg_list
) {
1238 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1241 * Call the device specific close. This cannot fail.
1242 * Only if device is UP
1244 * We allow it to be called even after a DETACH hot-plug
1250 dev
->flags
&= ~IFF_UP
;
1251 net_dmaengine_put();
1257 static int __dev_close(struct net_device
*dev
)
1262 list_add(&dev
->unreg_list
, &single
);
1263 retval
= __dev_close_many(&single
);
1268 static int dev_close_many(struct list_head
*head
)
1270 struct net_device
*dev
, *tmp
;
1271 LIST_HEAD(tmp_list
);
1273 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
)
1274 if (!(dev
->flags
& IFF_UP
))
1275 list_move(&dev
->unreg_list
, &tmp_list
);
1277 __dev_close_many(head
);
1279 list_for_each_entry(dev
, head
, unreg_list
) {
1280 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1281 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1284 /* rollback_registered_many needs the complete original list */
1285 list_splice(&tmp_list
, head
);
1290 * dev_close - shutdown an interface.
1291 * @dev: device to shutdown
1293 * This function moves an active device into down state. A
1294 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1295 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1298 int dev_close(struct net_device
*dev
)
1300 if (dev
->flags
& IFF_UP
) {
1303 list_add(&dev
->unreg_list
, &single
);
1304 dev_close_many(&single
);
1309 EXPORT_SYMBOL(dev_close
);
1313 * dev_disable_lro - disable Large Receive Offload on a device
1316 * Disable Large Receive Offload (LRO) on a net device. Must be
1317 * called under RTNL. This is needed if received packets may be
1318 * forwarded to another interface.
1320 void dev_disable_lro(struct net_device
*dev
)
1323 * If we're trying to disable lro on a vlan device
1324 * use the underlying physical device instead
1326 if (is_vlan_dev(dev
))
1327 dev
= vlan_dev_real_dev(dev
);
1329 dev
->wanted_features
&= ~NETIF_F_LRO
;
1330 netdev_update_features(dev
);
1332 if (unlikely(dev
->features
& NETIF_F_LRO
))
1333 netdev_WARN(dev
, "failed to disable LRO!\n");
1335 EXPORT_SYMBOL(dev_disable_lro
);
1338 static int dev_boot_phase
= 1;
1341 * register_netdevice_notifier - register a network notifier block
1344 * Register a notifier to be called when network device events occur.
1345 * The notifier passed is linked into the kernel structures and must
1346 * not be reused until it has been unregistered. A negative errno code
1347 * is returned on a failure.
1349 * When registered all registration and up events are replayed
1350 * to the new notifier to allow device to have a race free
1351 * view of the network device list.
1354 int register_netdevice_notifier(struct notifier_block
*nb
)
1356 struct net_device
*dev
;
1357 struct net_device
*last
;
1362 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1368 for_each_netdev(net
, dev
) {
1369 err
= nb
->notifier_call(nb
, NETDEV_REGISTER
, dev
);
1370 err
= notifier_to_errno(err
);
1374 if (!(dev
->flags
& IFF_UP
))
1377 nb
->notifier_call(nb
, NETDEV_UP
, dev
);
1388 for_each_netdev(net
, dev
) {
1392 if (dev
->flags
& IFF_UP
) {
1393 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1394 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1396 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1397 nb
->notifier_call(nb
, NETDEV_UNREGISTER_BATCH
, dev
);
1402 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1405 EXPORT_SYMBOL(register_netdevice_notifier
);
1408 * unregister_netdevice_notifier - unregister a network notifier block
1411 * Unregister a notifier previously registered by
1412 * register_netdevice_notifier(). The notifier is unlinked into the
1413 * kernel structures and may then be reused. A negative errno code
1414 * is returned on a failure.
1416 * After unregistering unregister and down device events are synthesized
1417 * for all devices on the device list to the removed notifier to remove
1418 * the need for special case cleanup code.
1421 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1423 struct net_device
*dev
;
1428 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1433 for_each_netdev(net
, dev
) {
1434 if (dev
->flags
& IFF_UP
) {
1435 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1436 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1438 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1439 nb
->notifier_call(nb
, NETDEV_UNREGISTER_BATCH
, dev
);
1446 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1449 * call_netdevice_notifiers - call all network notifier blocks
1450 * @val: value passed unmodified to notifier function
1451 * @dev: net_device pointer passed unmodified to notifier function
1453 * Call all network notifier blocks. Parameters and return value
1454 * are as for raw_notifier_call_chain().
1457 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1460 return raw_notifier_call_chain(&netdev_chain
, val
, dev
);
1462 EXPORT_SYMBOL(call_netdevice_notifiers
);
1464 static struct static_key netstamp_needed __read_mostly
;
1465 #ifdef HAVE_JUMP_LABEL
1466 /* We are not allowed to call static_key_slow_dec() from irq context
1467 * If net_disable_timestamp() is called from irq context, defer the
1468 * static_key_slow_dec() calls.
1470 static atomic_t netstamp_needed_deferred
;
1473 void net_enable_timestamp(void)
1475 #ifdef HAVE_JUMP_LABEL
1476 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1480 static_key_slow_dec(&netstamp_needed
);
1484 WARN_ON(in_interrupt());
1485 static_key_slow_inc(&netstamp_needed
);
1487 EXPORT_SYMBOL(net_enable_timestamp
);
1489 void net_disable_timestamp(void)
1491 #ifdef HAVE_JUMP_LABEL
1492 if (in_interrupt()) {
1493 atomic_inc(&netstamp_needed_deferred
);
1497 static_key_slow_dec(&netstamp_needed
);
1499 EXPORT_SYMBOL(net_disable_timestamp
);
1501 static inline void net_timestamp_set(struct sk_buff
*skb
)
1503 skb
->tstamp
.tv64
= 0;
1504 if (static_key_false(&netstamp_needed
))
1505 __net_timestamp(skb
);
1508 #define net_timestamp_check(COND, SKB) \
1509 if (static_key_false(&netstamp_needed)) { \
1510 if ((COND) && !(SKB)->tstamp.tv64) \
1511 __net_timestamp(SKB); \
1514 static int net_hwtstamp_validate(struct ifreq *ifr)
1516 struct hwtstamp_config cfg
;
1517 enum hwtstamp_tx_types tx_type
;
1518 enum hwtstamp_rx_filters rx_filter
;
1519 int tx_type_valid
= 0;
1520 int rx_filter_valid
= 0;
1522 if (copy_from_user(&cfg
, ifr
->ifr_data
, sizeof(cfg
)))
1525 if (cfg
.flags
) /* reserved for future extensions */
1528 tx_type
= cfg
.tx_type
;
1529 rx_filter
= cfg
.rx_filter
;
1532 case HWTSTAMP_TX_OFF
:
1533 case HWTSTAMP_TX_ON
:
1534 case HWTSTAMP_TX_ONESTEP_SYNC
:
1539 switch (rx_filter
) {
1540 case HWTSTAMP_FILTER_NONE
:
1541 case HWTSTAMP_FILTER_ALL
:
1542 case HWTSTAMP_FILTER_SOME
:
1543 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT
:
1544 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC
:
1545 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ
:
1546 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT
:
1547 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC
:
1548 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ
:
1549 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT
:
1550 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC
:
1551 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ
:
1552 case HWTSTAMP_FILTER_PTP_V2_EVENT
:
1553 case HWTSTAMP_FILTER_PTP_V2_SYNC
:
1554 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ
:
1555 rx_filter_valid
= 1;
1559 if (!tx_type_valid
|| !rx_filter_valid
)
1565 static inline bool is_skb_forwardable(struct net_device
*dev
,
1566 struct sk_buff
*skb
)
1570 if (!(dev
->flags
& IFF_UP
))
1573 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1574 if (skb
->len
<= len
)
1577 /* if TSO is enabled, we don't care about the length as the packet
1578 * could be forwarded without being segmented before
1580 if (skb_is_gso(skb
))
1587 * dev_forward_skb - loopback an skb to another netif
1589 * @dev: destination network device
1590 * @skb: buffer to forward
1593 * NET_RX_SUCCESS (no congestion)
1594 * NET_RX_DROP (packet was dropped, but freed)
1596 * dev_forward_skb can be used for injecting an skb from the
1597 * start_xmit function of one device into the receive queue
1598 * of another device.
1600 * The receiving device may be in another namespace, so
1601 * we have to clear all information in the skb that could
1602 * impact namespace isolation.
1604 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1606 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1607 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1608 atomic_long_inc(&dev
->rx_dropped
);
1617 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1618 atomic_long_inc(&dev
->rx_dropped
);
1625 skb
->tstamp
.tv64
= 0;
1626 skb
->pkt_type
= PACKET_HOST
;
1627 skb
->protocol
= eth_type_trans(skb
, dev
);
1631 return netif_rx(skb
);
1633 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1635 static inline int deliver_skb(struct sk_buff
*skb
,
1636 struct packet_type
*pt_prev
,
1637 struct net_device
*orig_dev
)
1639 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1641 atomic_inc(&skb
->users
);
1642 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1645 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1647 if (ptype
->af_packet_priv
== NULL
)
1650 if (ptype
->id_match
)
1651 return ptype
->id_match(ptype
, skb
->sk
);
1652 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1659 * Support routine. Sends outgoing frames to any network
1660 * taps currently in use.
1663 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1665 struct packet_type
*ptype
;
1666 struct sk_buff
*skb2
= NULL
;
1667 struct packet_type
*pt_prev
= NULL
;
1670 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1671 /* Never send packets back to the socket
1672 * they originated from - MvS (miquels@drinkel.ow.org)
1674 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1675 (!skb_loop_sk(ptype
, skb
))) {
1677 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1682 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1686 net_timestamp_set(skb2
);
1688 /* skb->nh should be correctly
1689 set by sender, so that the second statement is
1690 just protection against buggy protocols.
1692 skb_reset_mac_header(skb2
);
1694 if (skb_network_header(skb2
) < skb2
->data
||
1695 skb2
->network_header
> skb2
->tail
) {
1696 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1697 ntohs(skb2
->protocol
),
1699 skb_reset_network_header(skb2
);
1702 skb2
->transport_header
= skb2
->network_header
;
1703 skb2
->pkt_type
= PACKET_OUTGOING
;
1708 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1713 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1714 * @dev: Network device
1715 * @txq: number of queues available
1717 * If real_num_tx_queues is changed the tc mappings may no longer be
1718 * valid. To resolve this verify the tc mapping remains valid and if
1719 * not NULL the mapping. With no priorities mapping to this
1720 * offset/count pair it will no longer be used. In the worst case TC0
1721 * is invalid nothing can be done so disable priority mappings. If is
1722 * expected that drivers will fix this mapping if they can before
1723 * calling netif_set_real_num_tx_queues.
1725 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1728 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1730 /* If TC0 is invalidated disable TC mapping */
1731 if (tc
->offset
+ tc
->count
> txq
) {
1732 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1737 /* Invalidated prio to tc mappings set to TC0 */
1738 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1739 int q
= netdev_get_prio_tc_map(dev
, i
);
1741 tc
= &dev
->tc_to_txq
[q
];
1742 if (tc
->offset
+ tc
->count
> txq
) {
1743 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1745 netdev_set_prio_tc_map(dev
, i
, 0);
1751 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1752 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1754 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
1758 if (txq
< 1 || txq
> dev
->num_tx_queues
)
1761 if (dev
->reg_state
== NETREG_REGISTERED
||
1762 dev
->reg_state
== NETREG_UNREGISTERING
) {
1765 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
1771 netif_setup_tc(dev
, txq
);
1773 if (txq
< dev
->real_num_tx_queues
)
1774 qdisc_reset_all_tx_gt(dev
, txq
);
1777 dev
->real_num_tx_queues
= txq
;
1780 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
1784 * netif_set_real_num_rx_queues - set actual number of RX queues used
1785 * @dev: Network device
1786 * @rxq: Actual number of RX queues
1788 * This must be called either with the rtnl_lock held or before
1789 * registration of the net device. Returns 0 on success, or a
1790 * negative error code. If called before registration, it always
1793 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
1797 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
1800 if (dev
->reg_state
== NETREG_REGISTERED
) {
1803 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
1809 dev
->real_num_rx_queues
= rxq
;
1812 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
1816 * netif_get_num_default_rss_queues - default number of RSS queues
1818 * This routine should set an upper limit on the number of RSS queues
1819 * used by default by multiqueue devices.
1821 int netif_get_num_default_rss_queues(void)
1823 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
1825 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
1827 static inline void __netif_reschedule(struct Qdisc
*q
)
1829 struct softnet_data
*sd
;
1830 unsigned long flags
;
1832 local_irq_save(flags
);
1833 sd
= &__get_cpu_var(softnet_data
);
1834 q
->next_sched
= NULL
;
1835 *sd
->output_queue_tailp
= q
;
1836 sd
->output_queue_tailp
= &q
->next_sched
;
1837 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1838 local_irq_restore(flags
);
1841 void __netif_schedule(struct Qdisc
*q
)
1843 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
1844 __netif_reschedule(q
);
1846 EXPORT_SYMBOL(__netif_schedule
);
1848 void dev_kfree_skb_irq(struct sk_buff
*skb
)
1850 if (atomic_dec_and_test(&skb
->users
)) {
1851 struct softnet_data
*sd
;
1852 unsigned long flags
;
1854 local_irq_save(flags
);
1855 sd
= &__get_cpu_var(softnet_data
);
1856 skb
->next
= sd
->completion_queue
;
1857 sd
->completion_queue
= skb
;
1858 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1859 local_irq_restore(flags
);
1862 EXPORT_SYMBOL(dev_kfree_skb_irq
);
1864 void dev_kfree_skb_any(struct sk_buff
*skb
)
1866 if (in_irq() || irqs_disabled())
1867 dev_kfree_skb_irq(skb
);
1871 EXPORT_SYMBOL(dev_kfree_skb_any
);
1875 * netif_device_detach - mark device as removed
1876 * @dev: network device
1878 * Mark device as removed from system and therefore no longer available.
1880 void netif_device_detach(struct net_device
*dev
)
1882 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1883 netif_running(dev
)) {
1884 netif_tx_stop_all_queues(dev
);
1887 EXPORT_SYMBOL(netif_device_detach
);
1890 * netif_device_attach - mark device as attached
1891 * @dev: network device
1893 * Mark device as attached from system and restart if needed.
1895 void netif_device_attach(struct net_device
*dev
)
1897 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1898 netif_running(dev
)) {
1899 netif_tx_wake_all_queues(dev
);
1900 __netdev_watchdog_up(dev
);
1903 EXPORT_SYMBOL(netif_device_attach
);
1905 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
1907 static const netdev_features_t null_features
= 0;
1908 struct net_device
*dev
= skb
->dev
;
1909 const char *driver
= "";
1911 if (dev
&& dev
->dev
.parent
)
1912 driver
= dev_driver_string(dev
->dev
.parent
);
1914 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
1915 "gso_type=%d ip_summed=%d\n",
1916 driver
, dev
? &dev
->features
: &null_features
,
1917 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
1918 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
1919 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
1923 * Invalidate hardware checksum when packet is to be mangled, and
1924 * complete checksum manually on outgoing path.
1926 int skb_checksum_help(struct sk_buff
*skb
)
1929 int ret
= 0, offset
;
1931 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
1932 goto out_set_summed
;
1934 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
1935 skb_warn_bad_offload(skb
);
1939 offset
= skb_checksum_start_offset(skb
);
1940 BUG_ON(offset
>= skb_headlen(skb
));
1941 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
1943 offset
+= skb
->csum_offset
;
1944 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
1946 if (skb_cloned(skb
) &&
1947 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
1948 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
1953 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
1955 skb
->ip_summed
= CHECKSUM_NONE
;
1959 EXPORT_SYMBOL(skb_checksum_help
);
1962 * skb_gso_segment - Perform segmentation on skb.
1963 * @skb: buffer to segment
1964 * @features: features for the output path (see dev->features)
1966 * This function segments the given skb and returns a list of segments.
1968 * It may return NULL if the skb requires no segmentation. This is
1969 * only possible when GSO is used for verifying header integrity.
1971 struct sk_buff
*skb_gso_segment(struct sk_buff
*skb
,
1972 netdev_features_t features
)
1974 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
1975 struct packet_type
*ptype
;
1976 __be16 type
= skb
->protocol
;
1977 int vlan_depth
= ETH_HLEN
;
1980 while (type
== htons(ETH_P_8021Q
)) {
1981 struct vlan_hdr
*vh
;
1983 if (unlikely(!pskb_may_pull(skb
, vlan_depth
+ VLAN_HLEN
)))
1984 return ERR_PTR(-EINVAL
);
1986 vh
= (struct vlan_hdr
*)(skb
->data
+ vlan_depth
);
1987 type
= vh
->h_vlan_encapsulated_proto
;
1988 vlan_depth
+= VLAN_HLEN
;
1991 skb_reset_mac_header(skb
);
1992 skb
->mac_len
= skb
->network_header
- skb
->mac_header
;
1993 __skb_pull(skb
, skb
->mac_len
);
1995 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
1996 skb_warn_bad_offload(skb
);
1998 if (skb_header_cloned(skb
) &&
1999 (err
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
)))
2000 return ERR_PTR(err
);
2004 list_for_each_entry_rcu(ptype
,
2005 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
2006 if (ptype
->type
== type
&& !ptype
->dev
&& ptype
->gso_segment
) {
2007 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2008 err
= ptype
->gso_send_check(skb
);
2009 segs
= ERR_PTR(err
);
2010 if (err
|| skb_gso_ok(skb
, features
))
2012 __skb_push(skb
, (skb
->data
-
2013 skb_network_header(skb
)));
2015 segs
= ptype
->gso_segment(skb
, features
);
2021 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2025 EXPORT_SYMBOL(skb_gso_segment
);
2027 /* Take action when hardware reception checksum errors are detected. */
2029 void netdev_rx_csum_fault(struct net_device
*dev
)
2031 if (net_ratelimit()) {
2032 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2036 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2039 /* Actually, we should eliminate this check as soon as we know, that:
2040 * 1. IOMMU is present and allows to map all the memory.
2041 * 2. No high memory really exists on this machine.
2044 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2046 #ifdef CONFIG_HIGHMEM
2048 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2049 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2050 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2051 if (PageHighMem(skb_frag_page(frag
)))
2056 if (PCI_DMA_BUS_IS_PHYS
) {
2057 struct device
*pdev
= dev
->dev
.parent
;
2061 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2062 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2063 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2064 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2073 void (*destructor
)(struct sk_buff
*skb
);
2076 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2078 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
2080 struct dev_gso_cb
*cb
;
2083 struct sk_buff
*nskb
= skb
->next
;
2085 skb
->next
= nskb
->next
;
2088 } while (skb
->next
);
2090 cb
= DEV_GSO_CB(skb
);
2092 cb
->destructor(skb
);
2096 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2097 * @skb: buffer to segment
2098 * @features: device features as applicable to this skb
2100 * This function segments the given skb and stores the list of segments
2103 static int dev_gso_segment(struct sk_buff
*skb
, netdev_features_t features
)
2105 struct sk_buff
*segs
;
2107 segs
= skb_gso_segment(skb
, features
);
2109 /* Verifying header integrity only. */
2114 return PTR_ERR(segs
);
2117 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
2118 skb
->destructor
= dev_gso_skb_destructor
;
2123 static bool can_checksum_protocol(netdev_features_t features
, __be16 protocol
)
2125 return ((features
& NETIF_F_GEN_CSUM
) ||
2126 ((features
& NETIF_F_V4_CSUM
) &&
2127 protocol
== htons(ETH_P_IP
)) ||
2128 ((features
& NETIF_F_V6_CSUM
) &&
2129 protocol
== htons(ETH_P_IPV6
)) ||
2130 ((features
& NETIF_F_FCOE_CRC
) &&
2131 protocol
== htons(ETH_P_FCOE
)));
2134 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2135 __be16 protocol
, netdev_features_t features
)
2137 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2138 !can_checksum_protocol(features
, protocol
)) {
2139 features
&= ~NETIF_F_ALL_CSUM
;
2140 features
&= ~NETIF_F_SG
;
2141 } else if (illegal_highdma(skb
->dev
, skb
)) {
2142 features
&= ~NETIF_F_SG
;
2148 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2150 __be16 protocol
= skb
->protocol
;
2151 netdev_features_t features
= skb
->dev
->features
;
2153 if (skb_shinfo(skb
)->gso_segs
> skb
->dev
->gso_max_segs
)
2154 features
&= ~NETIF_F_GSO_MASK
;
2156 if (protocol
== htons(ETH_P_8021Q
)) {
2157 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
2158 protocol
= veh
->h_vlan_encapsulated_proto
;
2159 } else if (!vlan_tx_tag_present(skb
)) {
2160 return harmonize_features(skb
, protocol
, features
);
2163 features
&= (skb
->dev
->vlan_features
| NETIF_F_HW_VLAN_TX
);
2165 if (protocol
!= htons(ETH_P_8021Q
)) {
2166 return harmonize_features(skb
, protocol
, features
);
2168 features
&= NETIF_F_SG
| NETIF_F_HIGHDMA
| NETIF_F_FRAGLIST
|
2169 NETIF_F_GEN_CSUM
| NETIF_F_HW_VLAN_TX
;
2170 return harmonize_features(skb
, protocol
, features
);
2173 EXPORT_SYMBOL(netif_skb_features
);
2176 * Returns true if either:
2177 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2178 * 2. skb is fragmented and the device does not support SG, or if
2179 * at least one of fragments is in highmem and device does not
2180 * support DMA from it.
2182 static inline int skb_needs_linearize(struct sk_buff
*skb
,
2185 return skb_is_nonlinear(skb
) &&
2186 ((skb_has_frag_list(skb
) &&
2187 !(features
& NETIF_F_FRAGLIST
)) ||
2188 (skb_shinfo(skb
)->nr_frags
&&
2189 !(features
& NETIF_F_SG
)));
2192 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
2193 struct netdev_queue
*txq
)
2195 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2196 int rc
= NETDEV_TX_OK
;
2197 unsigned int skb_len
;
2199 if (likely(!skb
->next
)) {
2200 netdev_features_t features
;
2203 * If device doesn't need skb->dst, release it right now while
2204 * its hot in this cpu cache
2206 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2209 if (!list_empty(&ptype_all
))
2210 dev_queue_xmit_nit(skb
, dev
);
2212 features
= netif_skb_features(skb
);
2214 if (vlan_tx_tag_present(skb
) &&
2215 !(features
& NETIF_F_HW_VLAN_TX
)) {
2216 skb
= __vlan_put_tag(skb
, vlan_tx_tag_get(skb
));
2223 if (netif_needs_gso(skb
, features
)) {
2224 if (unlikely(dev_gso_segment(skb
, features
)))
2229 if (skb_needs_linearize(skb
, features
) &&
2230 __skb_linearize(skb
))
2233 /* If packet is not checksummed and device does not
2234 * support checksumming for this protocol, complete
2235 * checksumming here.
2237 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2238 skb_set_transport_header(skb
,
2239 skb_checksum_start_offset(skb
));
2240 if (!(features
& NETIF_F_ALL_CSUM
) &&
2241 skb_checksum_help(skb
))
2247 rc
= ops
->ndo_start_xmit(skb
, dev
);
2248 trace_net_dev_xmit(skb
, rc
, dev
, skb_len
);
2249 if (rc
== NETDEV_TX_OK
)
2250 txq_trans_update(txq
);
2256 struct sk_buff
*nskb
= skb
->next
;
2258 skb
->next
= nskb
->next
;
2262 * If device doesn't need nskb->dst, release it right now while
2263 * its hot in this cpu cache
2265 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2268 skb_len
= nskb
->len
;
2269 rc
= ops
->ndo_start_xmit(nskb
, dev
);
2270 trace_net_dev_xmit(nskb
, rc
, dev
, skb_len
);
2271 if (unlikely(rc
!= NETDEV_TX_OK
)) {
2272 if (rc
& ~NETDEV_TX_MASK
)
2273 goto out_kfree_gso_skb
;
2274 nskb
->next
= skb
->next
;
2278 txq_trans_update(txq
);
2279 if (unlikely(netif_xmit_stopped(txq
) && skb
->next
))
2280 return NETDEV_TX_BUSY
;
2281 } while (skb
->next
);
2284 if (likely(skb
->next
== NULL
))
2285 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
2292 static u32 hashrnd __read_mostly
;
2295 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2296 * to be used as a distribution range.
2298 u16
__skb_tx_hash(const struct net_device
*dev
, const struct sk_buff
*skb
,
2299 unsigned int num_tx_queues
)
2303 u16 qcount
= num_tx_queues
;
2305 if (skb_rx_queue_recorded(skb
)) {
2306 hash
= skb_get_rx_queue(skb
);
2307 while (unlikely(hash
>= num_tx_queues
))
2308 hash
-= num_tx_queues
;
2313 u8 tc
= netdev_get_prio_tc_map(dev
, skb
->priority
);
2314 qoffset
= dev
->tc_to_txq
[tc
].offset
;
2315 qcount
= dev
->tc_to_txq
[tc
].count
;
2318 if (skb
->sk
&& skb
->sk
->sk_hash
)
2319 hash
= skb
->sk
->sk_hash
;
2321 hash
= (__force u16
) skb
->protocol
;
2322 hash
= jhash_1word(hash
, hashrnd
);
2324 return (u16
) (((u64
) hash
* qcount
) >> 32) + qoffset
;
2326 EXPORT_SYMBOL(__skb_tx_hash
);
2328 static inline u16
dev_cap_txqueue(struct net_device
*dev
, u16 queue_index
)
2330 if (unlikely(queue_index
>= dev
->real_num_tx_queues
)) {
2331 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
2332 dev
->name
, queue_index
,
2333 dev
->real_num_tx_queues
);
2339 static inline int get_xps_queue(struct net_device
*dev
, struct sk_buff
*skb
)
2342 struct xps_dev_maps
*dev_maps
;
2343 struct xps_map
*map
;
2344 int queue_index
= -1;
2347 dev_maps
= rcu_dereference(dev
->xps_maps
);
2349 map
= rcu_dereference(
2350 dev_maps
->cpu_map
[raw_smp_processor_id()]);
2353 queue_index
= map
->queues
[0];
2356 if (skb
->sk
&& skb
->sk
->sk_hash
)
2357 hash
= skb
->sk
->sk_hash
;
2359 hash
= (__force u16
) skb
->protocol
^
2361 hash
= jhash_1word(hash
, hashrnd
);
2362 queue_index
= map
->queues
[
2363 ((u64
)hash
* map
->len
) >> 32];
2365 if (unlikely(queue_index
>= dev
->real_num_tx_queues
))
2377 static struct netdev_queue
*dev_pick_tx(struct net_device
*dev
,
2378 struct sk_buff
*skb
)
2381 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2383 if (dev
->real_num_tx_queues
== 1)
2385 else if (ops
->ndo_select_queue
) {
2386 queue_index
= ops
->ndo_select_queue(dev
, skb
);
2387 queue_index
= dev_cap_txqueue(dev
, queue_index
);
2389 struct sock
*sk
= skb
->sk
;
2390 queue_index
= sk_tx_queue_get(sk
);
2392 if (queue_index
< 0 || skb
->ooo_okay
||
2393 queue_index
>= dev
->real_num_tx_queues
) {
2394 int old_index
= queue_index
;
2396 queue_index
= get_xps_queue(dev
, skb
);
2397 if (queue_index
< 0)
2398 queue_index
= skb_tx_hash(dev
, skb
);
2400 if (queue_index
!= old_index
&& sk
) {
2401 struct dst_entry
*dst
=
2402 rcu_dereference_check(sk
->sk_dst_cache
, 1);
2404 if (dst
&& skb_dst(skb
) == dst
)
2405 sk_tx_queue_set(sk
, queue_index
);
2410 skb_set_queue_mapping(skb
, queue_index
);
2411 return netdev_get_tx_queue(dev
, queue_index
);
2414 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2415 struct net_device
*dev
,
2416 struct netdev_queue
*txq
)
2418 spinlock_t
*root_lock
= qdisc_lock(q
);
2422 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2423 qdisc_calculate_pkt_len(skb
, q
);
2425 * Heuristic to force contended enqueues to serialize on a
2426 * separate lock before trying to get qdisc main lock.
2427 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2428 * and dequeue packets faster.
2430 contended
= qdisc_is_running(q
);
2431 if (unlikely(contended
))
2432 spin_lock(&q
->busylock
);
2434 spin_lock(root_lock
);
2435 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2438 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2439 qdisc_run_begin(q
)) {
2441 * This is a work-conserving queue; there are no old skbs
2442 * waiting to be sent out; and the qdisc is not running -
2443 * xmit the skb directly.
2445 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2448 qdisc_bstats_update(q
, skb
);
2450 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2451 if (unlikely(contended
)) {
2452 spin_unlock(&q
->busylock
);
2459 rc
= NET_XMIT_SUCCESS
;
2462 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2463 if (qdisc_run_begin(q
)) {
2464 if (unlikely(contended
)) {
2465 spin_unlock(&q
->busylock
);
2471 spin_unlock(root_lock
);
2472 if (unlikely(contended
))
2473 spin_unlock(&q
->busylock
);
2477 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
2478 static void skb_update_prio(struct sk_buff
*skb
)
2480 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2482 if (!skb
->priority
&& skb
->sk
&& map
) {
2483 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2485 if (prioidx
< map
->priomap_len
)
2486 skb
->priority
= map
->priomap
[prioidx
];
2490 #define skb_update_prio(skb)
2493 static DEFINE_PER_CPU(int, xmit_recursion
);
2494 #define RECURSION_LIMIT 10
2497 * dev_loopback_xmit - loop back @skb
2498 * @skb: buffer to transmit
2500 int dev_loopback_xmit(struct sk_buff
*skb
)
2502 skb_reset_mac_header(skb
);
2503 __skb_pull(skb
, skb_network_offset(skb
));
2504 skb
->pkt_type
= PACKET_LOOPBACK
;
2505 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2506 WARN_ON(!skb_dst(skb
));
2511 EXPORT_SYMBOL(dev_loopback_xmit
);
2514 * dev_queue_xmit - transmit a buffer
2515 * @skb: buffer to transmit
2517 * Queue a buffer for transmission to a network device. The caller must
2518 * have set the device and priority and built the buffer before calling
2519 * this function. The function can be called from an interrupt.
2521 * A negative errno code is returned on a failure. A success does not
2522 * guarantee the frame will be transmitted as it may be dropped due
2523 * to congestion or traffic shaping.
2525 * -----------------------------------------------------------------------------------
2526 * I notice this method can also return errors from the queue disciplines,
2527 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2530 * Regardless of the return value, the skb is consumed, so it is currently
2531 * difficult to retry a send to this method. (You can bump the ref count
2532 * before sending to hold a reference for retry if you are careful.)
2534 * When calling this method, interrupts MUST be enabled. This is because
2535 * the BH enable code must have IRQs enabled so that it will not deadlock.
2538 int dev_queue_xmit(struct sk_buff
*skb
)
2540 struct net_device
*dev
= skb
->dev
;
2541 struct netdev_queue
*txq
;
2545 /* Disable soft irqs for various locks below. Also
2546 * stops preemption for RCU.
2550 skb_update_prio(skb
);
2552 txq
= dev_pick_tx(dev
, skb
);
2553 q
= rcu_dereference_bh(txq
->qdisc
);
2555 #ifdef CONFIG_NET_CLS_ACT
2556 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2558 trace_net_dev_queue(skb
);
2560 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2564 /* The device has no queue. Common case for software devices:
2565 loopback, all the sorts of tunnels...
2567 Really, it is unlikely that netif_tx_lock protection is necessary
2568 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2570 However, it is possible, that they rely on protection
2573 Check this and shot the lock. It is not prone from deadlocks.
2574 Either shot noqueue qdisc, it is even simpler 8)
2576 if (dev
->flags
& IFF_UP
) {
2577 int cpu
= smp_processor_id(); /* ok because BHs are off */
2579 if (txq
->xmit_lock_owner
!= cpu
) {
2581 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2582 goto recursion_alert
;
2584 HARD_TX_LOCK(dev
, txq
, cpu
);
2586 if (!netif_xmit_stopped(txq
)) {
2587 __this_cpu_inc(xmit_recursion
);
2588 rc
= dev_hard_start_xmit(skb
, dev
, txq
);
2589 __this_cpu_dec(xmit_recursion
);
2590 if (dev_xmit_complete(rc
)) {
2591 HARD_TX_UNLOCK(dev
, txq
);
2595 HARD_TX_UNLOCK(dev
, txq
);
2596 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2599 /* Recursion is detected! It is possible,
2603 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2609 rcu_read_unlock_bh();
2614 rcu_read_unlock_bh();
2617 EXPORT_SYMBOL(dev_queue_xmit
);
2620 /*=======================================================================
2622 =======================================================================*/
2624 int netdev_max_backlog __read_mostly
= 1000;
2625 int netdev_tstamp_prequeue __read_mostly
= 1;
2626 int netdev_budget __read_mostly
= 300;
2627 int weight_p __read_mostly
= 64; /* old backlog weight */
2629 /* Called with irq disabled */
2630 static inline void ____napi_schedule(struct softnet_data
*sd
,
2631 struct napi_struct
*napi
)
2633 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
2634 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2638 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2639 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2640 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2641 * if hash is a canonical 4-tuple hash over transport ports.
2643 void __skb_get_rxhash(struct sk_buff
*skb
)
2645 struct flow_keys keys
;
2648 if (!skb_flow_dissect(skb
, &keys
))
2654 /* get a consistent hash (same value on both flow directions) */
2655 if (((__force u32
)keys
.dst
< (__force u32
)keys
.src
) ||
2656 (((__force u32
)keys
.dst
== (__force u32
)keys
.src
) &&
2657 ((__force u16
)keys
.port16
[1] < (__force u16
)keys
.port16
[0]))) {
2658 swap(keys
.dst
, keys
.src
);
2659 swap(keys
.port16
[0], keys
.port16
[1]);
2662 hash
= jhash_3words((__force u32
)keys
.dst
,
2663 (__force u32
)keys
.src
,
2664 (__force u32
)keys
.ports
, hashrnd
);
2670 EXPORT_SYMBOL(__skb_get_rxhash
);
2674 /* One global table that all flow-based protocols share. */
2675 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
2676 EXPORT_SYMBOL(rps_sock_flow_table
);
2678 struct static_key rps_needed __read_mostly
;
2680 static struct rps_dev_flow
*
2681 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2682 struct rps_dev_flow
*rflow
, u16 next_cpu
)
2684 if (next_cpu
!= RPS_NO_CPU
) {
2685 #ifdef CONFIG_RFS_ACCEL
2686 struct netdev_rx_queue
*rxqueue
;
2687 struct rps_dev_flow_table
*flow_table
;
2688 struct rps_dev_flow
*old_rflow
;
2693 /* Should we steer this flow to a different hardware queue? */
2694 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
2695 !(dev
->features
& NETIF_F_NTUPLE
))
2697 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
2698 if (rxq_index
== skb_get_rx_queue(skb
))
2701 rxqueue
= dev
->_rx
+ rxq_index
;
2702 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2705 flow_id
= skb
->rxhash
& flow_table
->mask
;
2706 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
2707 rxq_index
, flow_id
);
2711 rflow
= &flow_table
->flows
[flow_id
];
2713 if (old_rflow
->filter
== rflow
->filter
)
2714 old_rflow
->filter
= RPS_NO_FILTER
;
2718 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
2721 rflow
->cpu
= next_cpu
;
2726 * get_rps_cpu is called from netif_receive_skb and returns the target
2727 * CPU from the RPS map of the receiving queue for a given skb.
2728 * rcu_read_lock must be held on entry.
2730 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2731 struct rps_dev_flow
**rflowp
)
2733 struct netdev_rx_queue
*rxqueue
;
2734 struct rps_map
*map
;
2735 struct rps_dev_flow_table
*flow_table
;
2736 struct rps_sock_flow_table
*sock_flow_table
;
2740 if (skb_rx_queue_recorded(skb
)) {
2741 u16 index
= skb_get_rx_queue(skb
);
2742 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
2743 WARN_ONCE(dev
->real_num_rx_queues
> 1,
2744 "%s received packet on queue %u, but number "
2745 "of RX queues is %u\n",
2746 dev
->name
, index
, dev
->real_num_rx_queues
);
2749 rxqueue
= dev
->_rx
+ index
;
2753 map
= rcu_dereference(rxqueue
->rps_map
);
2755 if (map
->len
== 1 &&
2756 !rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2757 tcpu
= map
->cpus
[0];
2758 if (cpu_online(tcpu
))
2762 } else if (!rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2766 skb_reset_network_header(skb
);
2767 if (!skb_get_rxhash(skb
))
2770 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2771 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
2772 if (flow_table
&& sock_flow_table
) {
2774 struct rps_dev_flow
*rflow
;
2776 rflow
= &flow_table
->flows
[skb
->rxhash
& flow_table
->mask
];
2779 next_cpu
= sock_flow_table
->ents
[skb
->rxhash
&
2780 sock_flow_table
->mask
];
2783 * If the desired CPU (where last recvmsg was done) is
2784 * different from current CPU (one in the rx-queue flow
2785 * table entry), switch if one of the following holds:
2786 * - Current CPU is unset (equal to RPS_NO_CPU).
2787 * - Current CPU is offline.
2788 * - The current CPU's queue tail has advanced beyond the
2789 * last packet that was enqueued using this table entry.
2790 * This guarantees that all previous packets for the flow
2791 * have been dequeued, thus preserving in order delivery.
2793 if (unlikely(tcpu
!= next_cpu
) &&
2794 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
2795 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
2796 rflow
->last_qtail
)) >= 0))
2797 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
2799 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
2807 tcpu
= map
->cpus
[((u64
) skb
->rxhash
* map
->len
) >> 32];
2809 if (cpu_online(tcpu
)) {
2819 #ifdef CONFIG_RFS_ACCEL
2822 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2823 * @dev: Device on which the filter was set
2824 * @rxq_index: RX queue index
2825 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2826 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2828 * Drivers that implement ndo_rx_flow_steer() should periodically call
2829 * this function for each installed filter and remove the filters for
2830 * which it returns %true.
2832 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
2833 u32 flow_id
, u16 filter_id
)
2835 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
2836 struct rps_dev_flow_table
*flow_table
;
2837 struct rps_dev_flow
*rflow
;
2842 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2843 if (flow_table
&& flow_id
<= flow_table
->mask
) {
2844 rflow
= &flow_table
->flows
[flow_id
];
2845 cpu
= ACCESS_ONCE(rflow
->cpu
);
2846 if (rflow
->filter
== filter_id
&& cpu
!= RPS_NO_CPU
&&
2847 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
2848 rflow
->last_qtail
) <
2849 (int)(10 * flow_table
->mask
)))
2855 EXPORT_SYMBOL(rps_may_expire_flow
);
2857 #endif /* CONFIG_RFS_ACCEL */
2859 /* Called from hardirq (IPI) context */
2860 static void rps_trigger_softirq(void *data
)
2862 struct softnet_data
*sd
= data
;
2864 ____napi_schedule(sd
, &sd
->backlog
);
2868 #endif /* CONFIG_RPS */
2871 * Check if this softnet_data structure is another cpu one
2872 * If yes, queue it to our IPI list and return 1
2875 static int rps_ipi_queued(struct softnet_data
*sd
)
2878 struct softnet_data
*mysd
= &__get_cpu_var(softnet_data
);
2881 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
2882 mysd
->rps_ipi_list
= sd
;
2884 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2887 #endif /* CONFIG_RPS */
2892 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2893 * queue (may be a remote CPU queue).
2895 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
2896 unsigned int *qtail
)
2898 struct softnet_data
*sd
;
2899 unsigned long flags
;
2901 sd
= &per_cpu(softnet_data
, cpu
);
2903 local_irq_save(flags
);
2906 if (skb_queue_len(&sd
->input_pkt_queue
) <= netdev_max_backlog
) {
2907 if (skb_queue_len(&sd
->input_pkt_queue
)) {
2909 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
2910 input_queue_tail_incr_save(sd
, qtail
);
2912 local_irq_restore(flags
);
2913 return NET_RX_SUCCESS
;
2916 /* Schedule NAPI for backlog device
2917 * We can use non atomic operation since we own the queue lock
2919 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
2920 if (!rps_ipi_queued(sd
))
2921 ____napi_schedule(sd
, &sd
->backlog
);
2929 local_irq_restore(flags
);
2931 atomic_long_inc(&skb
->dev
->rx_dropped
);
2937 * netif_rx - post buffer to the network code
2938 * @skb: buffer to post
2940 * This function receives a packet from a device driver and queues it for
2941 * the upper (protocol) levels to process. It always succeeds. The buffer
2942 * may be dropped during processing for congestion control or by the
2946 * NET_RX_SUCCESS (no congestion)
2947 * NET_RX_DROP (packet was dropped)
2951 int netif_rx(struct sk_buff
*skb
)
2955 /* if netpoll wants it, pretend we never saw it */
2956 if (netpoll_rx(skb
))
2959 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
2961 trace_netif_rx(skb
);
2963 if (static_key_false(&rps_needed
)) {
2964 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
2970 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
2972 cpu
= smp_processor_id();
2974 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
2982 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
2987 EXPORT_SYMBOL(netif_rx
);
2989 int netif_rx_ni(struct sk_buff
*skb
)
2994 err
= netif_rx(skb
);
2995 if (local_softirq_pending())
3001 EXPORT_SYMBOL(netif_rx_ni
);
3003 static void net_tx_action(struct softirq_action
*h
)
3005 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3007 if (sd
->completion_queue
) {
3008 struct sk_buff
*clist
;
3010 local_irq_disable();
3011 clist
= sd
->completion_queue
;
3012 sd
->completion_queue
= NULL
;
3016 struct sk_buff
*skb
= clist
;
3017 clist
= clist
->next
;
3019 WARN_ON(atomic_read(&skb
->users
));
3020 trace_kfree_skb(skb
, net_tx_action
);
3025 if (sd
->output_queue
) {
3028 local_irq_disable();
3029 head
= sd
->output_queue
;
3030 sd
->output_queue
= NULL
;
3031 sd
->output_queue_tailp
= &sd
->output_queue
;
3035 struct Qdisc
*q
= head
;
3036 spinlock_t
*root_lock
;
3038 head
= head
->next_sched
;
3040 root_lock
= qdisc_lock(q
);
3041 if (spin_trylock(root_lock
)) {
3042 smp_mb__before_clear_bit();
3043 clear_bit(__QDISC_STATE_SCHED
,
3046 spin_unlock(root_lock
);
3048 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3050 __netif_reschedule(q
);
3052 smp_mb__before_clear_bit();
3053 clear_bit(__QDISC_STATE_SCHED
,
3061 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3062 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3063 /* This hook is defined here for ATM LANE */
3064 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3065 unsigned char *addr
) __read_mostly
;
3066 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3069 #ifdef CONFIG_NET_CLS_ACT
3070 /* TODO: Maybe we should just force sch_ingress to be compiled in
3071 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3072 * a compare and 2 stores extra right now if we dont have it on
3073 * but have CONFIG_NET_CLS_ACT
3074 * NOTE: This doesn't stop any functionality; if you dont have
3075 * the ingress scheduler, you just can't add policies on ingress.
3078 static int ing_filter(struct sk_buff
*skb
, struct netdev_queue
*rxq
)
3080 struct net_device
*dev
= skb
->dev
;
3081 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
3082 int result
= TC_ACT_OK
;
3085 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
3086 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3087 skb
->skb_iif
, dev
->ifindex
);
3091 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
3092 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3095 if (q
!= &noop_qdisc
) {
3096 spin_lock(qdisc_lock(q
));
3097 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
3098 result
= qdisc_enqueue_root(skb
, q
);
3099 spin_unlock(qdisc_lock(q
));
3105 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3106 struct packet_type
**pt_prev
,
3107 int *ret
, struct net_device
*orig_dev
)
3109 struct netdev_queue
*rxq
= rcu_dereference(skb
->dev
->ingress_queue
);
3111 if (!rxq
|| rxq
->qdisc
== &noop_qdisc
)
3115 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3119 switch (ing_filter(skb
, rxq
)) {
3133 * netdev_rx_handler_register - register receive handler
3134 * @dev: device to register a handler for
3135 * @rx_handler: receive handler to register
3136 * @rx_handler_data: data pointer that is used by rx handler
3138 * Register a receive hander for a device. This handler will then be
3139 * called from __netif_receive_skb. A negative errno code is returned
3142 * The caller must hold the rtnl_mutex.
3144 * For a general description of rx_handler, see enum rx_handler_result.
3146 int netdev_rx_handler_register(struct net_device
*dev
,
3147 rx_handler_func_t
*rx_handler
,
3148 void *rx_handler_data
)
3152 if (dev
->rx_handler
)
3155 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3156 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3160 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3163 * netdev_rx_handler_unregister - unregister receive handler
3164 * @dev: device to unregister a handler from
3166 * Unregister a receive hander from a device.
3168 * The caller must hold the rtnl_mutex.
3170 void netdev_rx_handler_unregister(struct net_device
*dev
)
3174 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3175 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3177 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3180 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3181 * the special handling of PFMEMALLOC skbs.
3183 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3185 switch (skb
->protocol
) {
3186 case __constant_htons(ETH_P_ARP
):
3187 case __constant_htons(ETH_P_IP
):
3188 case __constant_htons(ETH_P_IPV6
):
3189 case __constant_htons(ETH_P_8021Q
):
3196 static int __netif_receive_skb(struct sk_buff
*skb
)
3198 struct packet_type
*ptype
, *pt_prev
;
3199 rx_handler_func_t
*rx_handler
;
3200 struct net_device
*orig_dev
;
3201 struct net_device
*null_or_dev
;
3202 bool deliver_exact
= false;
3203 int ret
= NET_RX_DROP
;
3205 unsigned long pflags
= current
->flags
;
3207 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3209 trace_netif_receive_skb(skb
);
3212 * PFMEMALLOC skbs are special, they should
3213 * - be delivered to SOCK_MEMALLOC sockets only
3214 * - stay away from userspace
3215 * - have bounded memory usage
3217 * Use PF_MEMALLOC as this saves us from propagating the allocation
3218 * context down to all allocation sites.
3220 if (sk_memalloc_socks() && skb_pfmemalloc(skb
))
3221 current
->flags
|= PF_MEMALLOC
;
3223 /* if we've gotten here through NAPI, check netpoll */
3224 if (netpoll_receive_skb(skb
))
3227 orig_dev
= skb
->dev
;
3229 skb_reset_network_header(skb
);
3230 skb_reset_transport_header(skb
);
3231 skb_reset_mac_len(skb
);
3238 skb
->skb_iif
= skb
->dev
->ifindex
;
3240 __this_cpu_inc(softnet_data
.processed
);
3242 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
)) {
3243 skb
= vlan_untag(skb
);
3248 #ifdef CONFIG_NET_CLS_ACT
3249 if (skb
->tc_verd
& TC_NCLS
) {
3250 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3255 if (sk_memalloc_socks() && skb_pfmemalloc(skb
))
3258 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3259 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
) {
3261 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3267 #ifdef CONFIG_NET_CLS_ACT
3268 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3274 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)
3275 && !skb_pfmemalloc_protocol(skb
))
3278 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3279 if (vlan_tx_tag_present(skb
)) {
3281 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3284 if (vlan_do_receive(&skb
, !rx_handler
))
3286 else if (unlikely(!skb
))
3292 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3295 switch (rx_handler(&skb
)) {
3296 case RX_HANDLER_CONSUMED
:
3298 case RX_HANDLER_ANOTHER
:
3300 case RX_HANDLER_EXACT
:
3301 deliver_exact
= true;
3302 case RX_HANDLER_PASS
:
3309 /* deliver only exact match when indicated */
3310 null_or_dev
= deliver_exact
? skb
->dev
: NULL
;
3312 type
= skb
->protocol
;
3313 list_for_each_entry_rcu(ptype
,
3314 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
3315 if (ptype
->type
== type
&&
3316 (ptype
->dev
== null_or_dev
|| ptype
->dev
== skb
->dev
||
3317 ptype
->dev
== orig_dev
)) {
3319 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3325 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3328 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3331 atomic_long_inc(&skb
->dev
->rx_dropped
);
3333 /* Jamal, now you will not able to escape explaining
3334 * me how you were going to use this. :-)
3342 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3347 * netif_receive_skb - process receive buffer from network
3348 * @skb: buffer to process
3350 * netif_receive_skb() is the main receive data processing function.
3351 * It always succeeds. The buffer may be dropped during processing
3352 * for congestion control or by the protocol layers.
3354 * This function may only be called from softirq context and interrupts
3355 * should be enabled.
3357 * Return values (usually ignored):
3358 * NET_RX_SUCCESS: no congestion
3359 * NET_RX_DROP: packet was dropped
3361 int netif_receive_skb(struct sk_buff
*skb
)
3363 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3365 if (skb_defer_rx_timestamp(skb
))
3366 return NET_RX_SUCCESS
;
3369 if (static_key_false(&rps_needed
)) {
3370 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3375 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3378 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3385 return __netif_receive_skb(skb
);
3387 EXPORT_SYMBOL(netif_receive_skb
);
3389 /* Network device is going away, flush any packets still pending
3390 * Called with irqs disabled.
3392 static void flush_backlog(void *arg
)
3394 struct net_device
*dev
= arg
;
3395 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3396 struct sk_buff
*skb
, *tmp
;
3399 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3400 if (skb
->dev
== dev
) {
3401 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3403 input_queue_head_incr(sd
);
3408 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3409 if (skb
->dev
== dev
) {
3410 __skb_unlink(skb
, &sd
->process_queue
);
3412 input_queue_head_incr(sd
);
3417 static int napi_gro_complete(struct sk_buff
*skb
)
3419 struct packet_type
*ptype
;
3420 __be16 type
= skb
->protocol
;
3421 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
3424 if (NAPI_GRO_CB(skb
)->count
== 1) {
3425 skb_shinfo(skb
)->gso_size
= 0;
3430 list_for_each_entry_rcu(ptype
, head
, list
) {
3431 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_complete
)
3434 err
= ptype
->gro_complete(skb
);
3440 WARN_ON(&ptype
->list
== head
);
3442 return NET_RX_SUCCESS
;
3446 return netif_receive_skb(skb
);
3449 inline void napi_gro_flush(struct napi_struct
*napi
)
3451 struct sk_buff
*skb
, *next
;
3453 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
3456 napi_gro_complete(skb
);
3459 napi
->gro_count
= 0;
3460 napi
->gro_list
= NULL
;
3462 EXPORT_SYMBOL(napi_gro_flush
);
3464 enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3466 struct sk_buff
**pp
= NULL
;
3467 struct packet_type
*ptype
;
3468 __be16 type
= skb
->protocol
;
3469 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
3472 enum gro_result ret
;
3474 if (!(skb
->dev
->features
& NETIF_F_GRO
) || netpoll_rx_on(skb
))
3477 if (skb_is_gso(skb
) || skb_has_frag_list(skb
))
3481 list_for_each_entry_rcu(ptype
, head
, list
) {
3482 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_receive
)
3485 skb_set_network_header(skb
, skb_gro_offset(skb
));
3486 mac_len
= skb
->network_header
- skb
->mac_header
;
3487 skb
->mac_len
= mac_len
;
3488 NAPI_GRO_CB(skb
)->same_flow
= 0;
3489 NAPI_GRO_CB(skb
)->flush
= 0;
3490 NAPI_GRO_CB(skb
)->free
= 0;
3492 pp
= ptype
->gro_receive(&napi
->gro_list
, skb
);
3497 if (&ptype
->list
== head
)
3500 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
3501 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
3504 struct sk_buff
*nskb
= *pp
;
3508 napi_gro_complete(nskb
);
3515 if (NAPI_GRO_CB(skb
)->flush
|| napi
->gro_count
>= MAX_GRO_SKBS
)
3519 NAPI_GRO_CB(skb
)->count
= 1;
3520 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
3521 skb
->next
= napi
->gro_list
;
3522 napi
->gro_list
= skb
;
3526 if (skb_headlen(skb
) < skb_gro_offset(skb
)) {
3527 int grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
3529 BUG_ON(skb
->end
- skb
->tail
< grow
);
3531 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3534 skb
->data_len
-= grow
;
3536 skb_shinfo(skb
)->frags
[0].page_offset
+= grow
;
3537 skb_frag_size_sub(&skb_shinfo(skb
)->frags
[0], grow
);
3539 if (unlikely(!skb_frag_size(&skb_shinfo(skb
)->frags
[0]))) {
3540 skb_frag_unref(skb
, 0);
3541 memmove(skb_shinfo(skb
)->frags
,
3542 skb_shinfo(skb
)->frags
+ 1,
3543 --skb_shinfo(skb
)->nr_frags
* sizeof(skb_frag_t
));
3554 EXPORT_SYMBOL(dev_gro_receive
);
3556 static inline gro_result_t
3557 __napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3560 unsigned int maclen
= skb
->dev
->hard_header_len
;
3562 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3563 unsigned long diffs
;
3565 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
3566 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
3567 if (maclen
== ETH_HLEN
)
3568 diffs
|= compare_ether_header(skb_mac_header(p
),
3569 skb_gro_mac_header(skb
));
3571 diffs
= memcmp(skb_mac_header(p
),
3572 skb_gro_mac_header(skb
),
3574 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
3575 NAPI_GRO_CB(p
)->flush
= 0;
3578 return dev_gro_receive(napi
, skb
);
3581 gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
3585 if (netif_receive_skb(skb
))
3593 case GRO_MERGED_FREE
:
3594 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
3595 kmem_cache_free(skbuff_head_cache
, skb
);
3607 EXPORT_SYMBOL(napi_skb_finish
);
3609 void skb_gro_reset_offset(struct sk_buff
*skb
)
3611 NAPI_GRO_CB(skb
)->data_offset
= 0;
3612 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3613 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3615 if (skb
->mac_header
== skb
->tail
&&
3616 !PageHighMem(skb_frag_page(&skb_shinfo(skb
)->frags
[0]))) {
3617 NAPI_GRO_CB(skb
)->frag0
=
3618 skb_frag_address(&skb_shinfo(skb
)->frags
[0]);
3619 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(&skb_shinfo(skb
)->frags
[0]);
3622 EXPORT_SYMBOL(skb_gro_reset_offset
);
3624 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3626 skb_gro_reset_offset(skb
);
3628 return napi_skb_finish(__napi_gro_receive(napi
, skb
), skb
);
3630 EXPORT_SYMBOL(napi_gro_receive
);
3632 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
3634 __skb_pull(skb
, skb_headlen(skb
));
3635 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3636 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
3638 skb
->dev
= napi
->dev
;
3644 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
3646 struct sk_buff
*skb
= napi
->skb
;
3649 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
3655 EXPORT_SYMBOL(napi_get_frags
);
3657 gro_result_t
napi_frags_finish(struct napi_struct
*napi
, struct sk_buff
*skb
,
3663 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
3665 if (ret
== GRO_HELD
)
3666 skb_gro_pull(skb
, -ETH_HLEN
);
3667 else if (netif_receive_skb(skb
))
3672 case GRO_MERGED_FREE
:
3673 napi_reuse_skb(napi
, skb
);
3682 EXPORT_SYMBOL(napi_frags_finish
);
3684 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
3686 struct sk_buff
*skb
= napi
->skb
;
3693 skb_reset_mac_header(skb
);
3694 skb_gro_reset_offset(skb
);
3696 off
= skb_gro_offset(skb
);
3697 hlen
= off
+ sizeof(*eth
);
3698 eth
= skb_gro_header_fast(skb
, off
);
3699 if (skb_gro_header_hard(skb
, hlen
)) {
3700 eth
= skb_gro_header_slow(skb
, hlen
, off
);
3701 if (unlikely(!eth
)) {
3702 napi_reuse_skb(napi
, skb
);
3708 skb_gro_pull(skb
, sizeof(*eth
));
3711 * This works because the only protocols we care about don't require
3712 * special handling. We'll fix it up properly at the end.
3714 skb
->protocol
= eth
->h_proto
;
3720 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
3722 struct sk_buff
*skb
= napi_frags_skb(napi
);
3727 return napi_frags_finish(napi
, skb
, __napi_gro_receive(napi
, skb
));
3729 EXPORT_SYMBOL(napi_gro_frags
);
3732 * net_rps_action sends any pending IPI's for rps.
3733 * Note: called with local irq disabled, but exits with local irq enabled.
3735 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
3738 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
3741 sd
->rps_ipi_list
= NULL
;
3745 /* Send pending IPI's to kick RPS processing on remote cpus. */
3747 struct softnet_data
*next
= remsd
->rps_ipi_next
;
3749 if (cpu_online(remsd
->cpu
))
3750 __smp_call_function_single(remsd
->cpu
,
3759 static int process_backlog(struct napi_struct
*napi
, int quota
)
3762 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
3765 /* Check if we have pending ipi, its better to send them now,
3766 * not waiting net_rx_action() end.
3768 if (sd
->rps_ipi_list
) {
3769 local_irq_disable();
3770 net_rps_action_and_irq_enable(sd
);
3773 napi
->weight
= weight_p
;
3774 local_irq_disable();
3775 while (work
< quota
) {
3776 struct sk_buff
*skb
;
3779 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
3781 __netif_receive_skb(skb
);
3782 local_irq_disable();
3783 input_queue_head_incr(sd
);
3784 if (++work
>= quota
) {
3791 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3793 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
3794 &sd
->process_queue
);
3796 if (qlen
< quota
- work
) {
3798 * Inline a custom version of __napi_complete().
3799 * only current cpu owns and manipulates this napi,
3800 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3801 * we can use a plain write instead of clear_bit(),
3802 * and we dont need an smp_mb() memory barrier.
3804 list_del(&napi
->poll_list
);
3807 quota
= work
+ qlen
;
3817 * __napi_schedule - schedule for receive
3818 * @n: entry to schedule
3820 * The entry's receive function will be scheduled to run
3822 void __napi_schedule(struct napi_struct
*n
)
3824 unsigned long flags
;
3826 local_irq_save(flags
);
3827 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
3828 local_irq_restore(flags
);
3830 EXPORT_SYMBOL(__napi_schedule
);
3832 void __napi_complete(struct napi_struct
*n
)
3834 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
3835 BUG_ON(n
->gro_list
);
3837 list_del(&n
->poll_list
);
3838 smp_mb__before_clear_bit();
3839 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
3841 EXPORT_SYMBOL(__napi_complete
);
3843 void napi_complete(struct napi_struct
*n
)
3845 unsigned long flags
;
3848 * don't let napi dequeue from the cpu poll list
3849 * just in case its running on a different cpu
3851 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
3855 local_irq_save(flags
);
3857 local_irq_restore(flags
);
3859 EXPORT_SYMBOL(napi_complete
);
3861 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
3862 int (*poll
)(struct napi_struct
*, int), int weight
)
3864 INIT_LIST_HEAD(&napi
->poll_list
);
3865 napi
->gro_count
= 0;
3866 napi
->gro_list
= NULL
;
3869 napi
->weight
= weight
;
3870 list_add(&napi
->dev_list
, &dev
->napi_list
);
3872 #ifdef CONFIG_NETPOLL
3873 spin_lock_init(&napi
->poll_lock
);
3874 napi
->poll_owner
= -1;
3876 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
3878 EXPORT_SYMBOL(netif_napi_add
);
3880 void netif_napi_del(struct napi_struct
*napi
)
3882 struct sk_buff
*skb
, *next
;
3884 list_del_init(&napi
->dev_list
);
3885 napi_free_frags(napi
);
3887 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
3893 napi
->gro_list
= NULL
;
3894 napi
->gro_count
= 0;
3896 EXPORT_SYMBOL(netif_napi_del
);
3898 static void net_rx_action(struct softirq_action
*h
)
3900 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3901 unsigned long time_limit
= jiffies
+ 2;
3902 int budget
= netdev_budget
;
3905 local_irq_disable();
3907 while (!list_empty(&sd
->poll_list
)) {
3908 struct napi_struct
*n
;
3911 /* If softirq window is exhuasted then punt.
3912 * Allow this to run for 2 jiffies since which will allow
3913 * an average latency of 1.5/HZ.
3915 if (unlikely(budget
<= 0 || time_after(jiffies
, time_limit
)))
3920 /* Even though interrupts have been re-enabled, this
3921 * access is safe because interrupts can only add new
3922 * entries to the tail of this list, and only ->poll()
3923 * calls can remove this head entry from the list.
3925 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
3927 have
= netpoll_poll_lock(n
);
3931 /* This NAPI_STATE_SCHED test is for avoiding a race
3932 * with netpoll's poll_napi(). Only the entity which
3933 * obtains the lock and sees NAPI_STATE_SCHED set will
3934 * actually make the ->poll() call. Therefore we avoid
3935 * accidentally calling ->poll() when NAPI is not scheduled.
3938 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
3939 work
= n
->poll(n
, weight
);
3943 WARN_ON_ONCE(work
> weight
);
3947 local_irq_disable();
3949 /* Drivers must not modify the NAPI state if they
3950 * consume the entire weight. In such cases this code
3951 * still "owns" the NAPI instance and therefore can
3952 * move the instance around on the list at-will.
3954 if (unlikely(work
== weight
)) {
3955 if (unlikely(napi_disable_pending(n
))) {
3958 local_irq_disable();
3960 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
3963 netpoll_poll_unlock(have
);
3966 net_rps_action_and_irq_enable(sd
);
3968 #ifdef CONFIG_NET_DMA
3970 * There may not be any more sk_buffs coming right now, so push
3971 * any pending DMA copies to hardware
3973 dma_issue_pending_all();
3980 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
3984 static gifconf_func_t
*gifconf_list
[NPROTO
];
3987 * register_gifconf - register a SIOCGIF handler
3988 * @family: Address family
3989 * @gifconf: Function handler
3991 * Register protocol dependent address dumping routines. The handler
3992 * that is passed must not be freed or reused until it has been replaced
3993 * by another handler.
3995 int register_gifconf(unsigned int family
, gifconf_func_t
*gifconf
)
3997 if (family
>= NPROTO
)
3999 gifconf_list
[family
] = gifconf
;
4002 EXPORT_SYMBOL(register_gifconf
);
4006 * Map an interface index to its name (SIOCGIFNAME)
4010 * We need this ioctl for efficient implementation of the
4011 * if_indextoname() function required by the IPv6 API. Without
4012 * it, we would have to search all the interfaces to find a
4016 static int dev_ifname(struct net
*net
, struct ifreq __user
*arg
)
4018 struct net_device
*dev
;
4022 * Fetch the caller's info block.
4025 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
4029 dev
= dev_get_by_index_rcu(net
, ifr
.ifr_ifindex
);
4035 strcpy(ifr
.ifr_name
, dev
->name
);
4038 if (copy_to_user(arg
, &ifr
, sizeof(struct ifreq
)))
4044 * Perform a SIOCGIFCONF call. This structure will change
4045 * size eventually, and there is nothing I can do about it.
4046 * Thus we will need a 'compatibility mode'.
4049 static int dev_ifconf(struct net
*net
, char __user
*arg
)
4052 struct net_device
*dev
;
4059 * Fetch the caller's info block.
4062 if (copy_from_user(&ifc
, arg
, sizeof(struct ifconf
)))
4069 * Loop over the interfaces, and write an info block for each.
4073 for_each_netdev(net
, dev
) {
4074 for (i
= 0; i
< NPROTO
; i
++) {
4075 if (gifconf_list
[i
]) {
4078 done
= gifconf_list
[i
](dev
, NULL
, 0);
4080 done
= gifconf_list
[i
](dev
, pos
+ total
,
4090 * All done. Write the updated control block back to the caller.
4092 ifc
.ifc_len
= total
;
4095 * Both BSD and Solaris return 0 here, so we do too.
4097 return copy_to_user(arg
, &ifc
, sizeof(struct ifconf
)) ? -EFAULT
: 0;
4100 #ifdef CONFIG_PROC_FS
4102 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4104 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4105 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4106 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4108 static inline struct net_device
*dev_from_same_bucket(struct seq_file
*seq
, loff_t
*pos
)
4110 struct net
*net
= seq_file_net(seq
);
4111 struct net_device
*dev
;
4112 struct hlist_node
*p
;
4113 struct hlist_head
*h
;
4114 unsigned int count
= 0, offset
= get_offset(*pos
);
4116 h
= &net
->dev_name_head
[get_bucket(*pos
)];
4117 hlist_for_each_entry_rcu(dev
, p
, h
, name_hlist
) {
4118 if (++count
== offset
)
4125 static inline struct net_device
*dev_from_bucket(struct seq_file
*seq
, loff_t
*pos
)
4127 struct net_device
*dev
;
4128 unsigned int bucket
;
4131 dev
= dev_from_same_bucket(seq
, pos
);
4135 bucket
= get_bucket(*pos
) + 1;
4136 *pos
= set_bucket_offset(bucket
, 1);
4137 } while (bucket
< NETDEV_HASHENTRIES
);
4143 * This is invoked by the /proc filesystem handler to display a device
4146 void *dev_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4151 return SEQ_START_TOKEN
;
4153 if (get_bucket(*pos
) >= NETDEV_HASHENTRIES
)
4156 return dev_from_bucket(seq
, pos
);
4159 void *dev_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4162 return dev_from_bucket(seq
, pos
);
4165 void dev_seq_stop(struct seq_file
*seq
, void *v
)
4171 static void dev_seq_printf_stats(struct seq_file
*seq
, struct net_device
*dev
)
4173 struct rtnl_link_stats64 temp
;
4174 const struct rtnl_link_stats64
*stats
= dev_get_stats(dev
, &temp
);
4176 seq_printf(seq
, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4177 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4178 dev
->name
, stats
->rx_bytes
, stats
->rx_packets
,
4180 stats
->rx_dropped
+ stats
->rx_missed_errors
,
4181 stats
->rx_fifo_errors
,
4182 stats
->rx_length_errors
+ stats
->rx_over_errors
+
4183 stats
->rx_crc_errors
+ stats
->rx_frame_errors
,
4184 stats
->rx_compressed
, stats
->multicast
,
4185 stats
->tx_bytes
, stats
->tx_packets
,
4186 stats
->tx_errors
, stats
->tx_dropped
,
4187 stats
->tx_fifo_errors
, stats
->collisions
,
4188 stats
->tx_carrier_errors
+
4189 stats
->tx_aborted_errors
+
4190 stats
->tx_window_errors
+
4191 stats
->tx_heartbeat_errors
,
4192 stats
->tx_compressed
);
4196 * Called from the PROCfs module. This now uses the new arbitrary sized
4197 * /proc/net interface to create /proc/net/dev
4199 static int dev_seq_show(struct seq_file
*seq
, void *v
)
4201 if (v
== SEQ_START_TOKEN
)
4202 seq_puts(seq
, "Inter-| Receive "
4204 " face |bytes packets errs drop fifo frame "
4205 "compressed multicast|bytes packets errs "
4206 "drop fifo colls carrier compressed\n");
4208 dev_seq_printf_stats(seq
, v
);
4212 static struct softnet_data
*softnet_get_online(loff_t
*pos
)
4214 struct softnet_data
*sd
= NULL
;
4216 while (*pos
< nr_cpu_ids
)
4217 if (cpu_online(*pos
)) {
4218 sd
= &per_cpu(softnet_data
, *pos
);
4225 static void *softnet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4227 return softnet_get_online(pos
);
4230 static void *softnet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4233 return softnet_get_online(pos
);
4236 static void softnet_seq_stop(struct seq_file
*seq
, void *v
)
4240 static int softnet_seq_show(struct seq_file
*seq
, void *v
)
4242 struct softnet_data
*sd
= v
;
4244 seq_printf(seq
, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4245 sd
->processed
, sd
->dropped
, sd
->time_squeeze
, 0,
4246 0, 0, 0, 0, /* was fastroute */
4247 sd
->cpu_collision
, sd
->received_rps
);
4251 static const struct seq_operations dev_seq_ops
= {
4252 .start
= dev_seq_start
,
4253 .next
= dev_seq_next
,
4254 .stop
= dev_seq_stop
,
4255 .show
= dev_seq_show
,
4258 static int dev_seq_open(struct inode
*inode
, struct file
*file
)
4260 return seq_open_net(inode
, file
, &dev_seq_ops
,
4261 sizeof(struct seq_net_private
));
4264 static const struct file_operations dev_seq_fops
= {
4265 .owner
= THIS_MODULE
,
4266 .open
= dev_seq_open
,
4268 .llseek
= seq_lseek
,
4269 .release
= seq_release_net
,
4272 static const struct seq_operations softnet_seq_ops
= {
4273 .start
= softnet_seq_start
,
4274 .next
= softnet_seq_next
,
4275 .stop
= softnet_seq_stop
,
4276 .show
= softnet_seq_show
,
4279 static int softnet_seq_open(struct inode
*inode
, struct file
*file
)
4281 return seq_open(file
, &softnet_seq_ops
);
4284 static const struct file_operations softnet_seq_fops
= {
4285 .owner
= THIS_MODULE
,
4286 .open
= softnet_seq_open
,
4288 .llseek
= seq_lseek
,
4289 .release
= seq_release
,
4292 static void *ptype_get_idx(loff_t pos
)
4294 struct packet_type
*pt
= NULL
;
4298 list_for_each_entry_rcu(pt
, &ptype_all
, list
) {
4304 for (t
= 0; t
< PTYPE_HASH_SIZE
; t
++) {
4305 list_for_each_entry_rcu(pt
, &ptype_base
[t
], list
) {
4314 static void *ptype_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4318 return *pos
? ptype_get_idx(*pos
- 1) : SEQ_START_TOKEN
;
4321 static void *ptype_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4323 struct packet_type
*pt
;
4324 struct list_head
*nxt
;
4328 if (v
== SEQ_START_TOKEN
)
4329 return ptype_get_idx(0);
4332 nxt
= pt
->list
.next
;
4333 if (pt
->type
== htons(ETH_P_ALL
)) {
4334 if (nxt
!= &ptype_all
)
4337 nxt
= ptype_base
[0].next
;
4339 hash
= ntohs(pt
->type
) & PTYPE_HASH_MASK
;
4341 while (nxt
== &ptype_base
[hash
]) {
4342 if (++hash
>= PTYPE_HASH_SIZE
)
4344 nxt
= ptype_base
[hash
].next
;
4347 return list_entry(nxt
, struct packet_type
, list
);
4350 static void ptype_seq_stop(struct seq_file
*seq
, void *v
)
4356 static int ptype_seq_show(struct seq_file
*seq
, void *v
)
4358 struct packet_type
*pt
= v
;
4360 if (v
== SEQ_START_TOKEN
)
4361 seq_puts(seq
, "Type Device Function\n");
4362 else if (pt
->dev
== NULL
|| dev_net(pt
->dev
) == seq_file_net(seq
)) {
4363 if (pt
->type
== htons(ETH_P_ALL
))
4364 seq_puts(seq
, "ALL ");
4366 seq_printf(seq
, "%04x", ntohs(pt
->type
));
4368 seq_printf(seq
, " %-8s %pF\n",
4369 pt
->dev
? pt
->dev
->name
: "", pt
->func
);
4375 static const struct seq_operations ptype_seq_ops
= {
4376 .start
= ptype_seq_start
,
4377 .next
= ptype_seq_next
,
4378 .stop
= ptype_seq_stop
,
4379 .show
= ptype_seq_show
,
4382 static int ptype_seq_open(struct inode
*inode
, struct file
*file
)
4384 return seq_open_net(inode
, file
, &ptype_seq_ops
,
4385 sizeof(struct seq_net_private
));
4388 static const struct file_operations ptype_seq_fops
= {
4389 .owner
= THIS_MODULE
,
4390 .open
= ptype_seq_open
,
4392 .llseek
= seq_lseek
,
4393 .release
= seq_release_net
,
4397 static int __net_init
dev_proc_net_init(struct net
*net
)
4401 if (!proc_net_fops_create(net
, "dev", S_IRUGO
, &dev_seq_fops
))
4403 if (!proc_net_fops_create(net
, "softnet_stat", S_IRUGO
, &softnet_seq_fops
))
4405 if (!proc_net_fops_create(net
, "ptype", S_IRUGO
, &ptype_seq_fops
))
4408 if (wext_proc_init(net
))
4414 proc_net_remove(net
, "ptype");
4416 proc_net_remove(net
, "softnet_stat");
4418 proc_net_remove(net
, "dev");
4422 static void __net_exit
dev_proc_net_exit(struct net
*net
)
4424 wext_proc_exit(net
);
4426 proc_net_remove(net
, "ptype");
4427 proc_net_remove(net
, "softnet_stat");
4428 proc_net_remove(net
, "dev");
4431 static struct pernet_operations __net_initdata dev_proc_ops
= {
4432 .init
= dev_proc_net_init
,
4433 .exit
= dev_proc_net_exit
,
4436 static int __init
dev_proc_init(void)
4438 return register_pernet_subsys(&dev_proc_ops
);
4441 #define dev_proc_init() 0
4442 #endif /* CONFIG_PROC_FS */
4446 * netdev_set_master - set up master pointer
4447 * @slave: slave device
4448 * @master: new master device
4450 * Changes the master device of the slave. Pass %NULL to break the
4451 * bonding. The caller must hold the RTNL semaphore. On a failure
4452 * a negative errno code is returned. On success the reference counts
4453 * are adjusted and the function returns zero.
4455 int netdev_set_master(struct net_device
*slave
, struct net_device
*master
)
4457 struct net_device
*old
= slave
->master
;
4467 slave
->master
= master
;
4473 EXPORT_SYMBOL(netdev_set_master
);
4476 * netdev_set_bond_master - set up bonding master/slave pair
4477 * @slave: slave device
4478 * @master: new master device
4480 * Changes the master device of the slave. Pass %NULL to break the
4481 * bonding. The caller must hold the RTNL semaphore. On a failure
4482 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4483 * to the routing socket and the function returns zero.
4485 int netdev_set_bond_master(struct net_device
*slave
, struct net_device
*master
)
4491 err
= netdev_set_master(slave
, master
);
4495 slave
->flags
|= IFF_SLAVE
;
4497 slave
->flags
&= ~IFF_SLAVE
;
4499 rtmsg_ifinfo(RTM_NEWLINK
, slave
, IFF_SLAVE
);
4502 EXPORT_SYMBOL(netdev_set_bond_master
);
4504 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
4506 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4508 if ((dev
->flags
& IFF_UP
) && ops
->ndo_change_rx_flags
)
4509 ops
->ndo_change_rx_flags(dev
, flags
);
4512 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
)
4514 unsigned int old_flags
= dev
->flags
;
4520 dev
->flags
|= IFF_PROMISC
;
4521 dev
->promiscuity
+= inc
;
4522 if (dev
->promiscuity
== 0) {
4525 * If inc causes overflow, untouch promisc and return error.
4528 dev
->flags
&= ~IFF_PROMISC
;
4530 dev
->promiscuity
-= inc
;
4531 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
4536 if (dev
->flags
!= old_flags
) {
4537 pr_info("device %s %s promiscuous mode\n",
4539 dev
->flags
& IFF_PROMISC
? "entered" : "left");
4540 if (audit_enabled
) {
4541 current_uid_gid(&uid
, &gid
);
4542 audit_log(current
->audit_context
, GFP_ATOMIC
,
4543 AUDIT_ANOM_PROMISCUOUS
,
4544 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4545 dev
->name
, (dev
->flags
& IFF_PROMISC
),
4546 (old_flags
& IFF_PROMISC
),
4547 audit_get_loginuid(current
),
4549 audit_get_sessionid(current
));
4552 dev_change_rx_flags(dev
, IFF_PROMISC
);
4558 * dev_set_promiscuity - update promiscuity count on a device
4562 * Add or remove promiscuity from a device. While the count in the device
4563 * remains above zero the interface remains promiscuous. Once it hits zero
4564 * the device reverts back to normal filtering operation. A negative inc
4565 * value is used to drop promiscuity on the device.
4566 * Return 0 if successful or a negative errno code on error.
4568 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
4570 unsigned int old_flags
= dev
->flags
;
4573 err
= __dev_set_promiscuity(dev
, inc
);
4576 if (dev
->flags
!= old_flags
)
4577 dev_set_rx_mode(dev
);
4580 EXPORT_SYMBOL(dev_set_promiscuity
);
4583 * dev_set_allmulti - update allmulti count on a device
4587 * Add or remove reception of all multicast frames to a device. While the
4588 * count in the device remains above zero the interface remains listening
4589 * to all interfaces. Once it hits zero the device reverts back to normal
4590 * filtering operation. A negative @inc value is used to drop the counter
4591 * when releasing a resource needing all multicasts.
4592 * Return 0 if successful or a negative errno code on error.
4595 int dev_set_allmulti(struct net_device
*dev
, int inc
)
4597 unsigned int old_flags
= dev
->flags
;
4601 dev
->flags
|= IFF_ALLMULTI
;
4602 dev
->allmulti
+= inc
;
4603 if (dev
->allmulti
== 0) {
4606 * If inc causes overflow, untouch allmulti and return error.
4609 dev
->flags
&= ~IFF_ALLMULTI
;
4611 dev
->allmulti
-= inc
;
4612 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
4617 if (dev
->flags
^ old_flags
) {
4618 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
4619 dev_set_rx_mode(dev
);
4623 EXPORT_SYMBOL(dev_set_allmulti
);
4626 * Upload unicast and multicast address lists to device and
4627 * configure RX filtering. When the device doesn't support unicast
4628 * filtering it is put in promiscuous mode while unicast addresses
4631 void __dev_set_rx_mode(struct net_device
*dev
)
4633 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4635 /* dev_open will call this function so the list will stay sane. */
4636 if (!(dev
->flags
&IFF_UP
))
4639 if (!netif_device_present(dev
))
4642 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
4643 /* Unicast addresses changes may only happen under the rtnl,
4644 * therefore calling __dev_set_promiscuity here is safe.
4646 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
4647 __dev_set_promiscuity(dev
, 1);
4648 dev
->uc_promisc
= true;
4649 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
4650 __dev_set_promiscuity(dev
, -1);
4651 dev
->uc_promisc
= false;
4655 if (ops
->ndo_set_rx_mode
)
4656 ops
->ndo_set_rx_mode(dev
);
4659 void dev_set_rx_mode(struct net_device
*dev
)
4661 netif_addr_lock_bh(dev
);
4662 __dev_set_rx_mode(dev
);
4663 netif_addr_unlock_bh(dev
);
4667 * dev_get_flags - get flags reported to userspace
4670 * Get the combination of flag bits exported through APIs to userspace.
4672 unsigned int dev_get_flags(const struct net_device
*dev
)
4676 flags
= (dev
->flags
& ~(IFF_PROMISC
|
4681 (dev
->gflags
& (IFF_PROMISC
|
4684 if (netif_running(dev
)) {
4685 if (netif_oper_up(dev
))
4686 flags
|= IFF_RUNNING
;
4687 if (netif_carrier_ok(dev
))
4688 flags
|= IFF_LOWER_UP
;
4689 if (netif_dormant(dev
))
4690 flags
|= IFF_DORMANT
;
4695 EXPORT_SYMBOL(dev_get_flags
);
4697 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4699 unsigned int old_flags
= dev
->flags
;
4705 * Set the flags on our device.
4708 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
4709 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
4711 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
4715 * Load in the correct multicast list now the flags have changed.
4718 if ((old_flags
^ flags
) & IFF_MULTICAST
)
4719 dev_change_rx_flags(dev
, IFF_MULTICAST
);
4721 dev_set_rx_mode(dev
);
4724 * Have we downed the interface. We handle IFF_UP ourselves
4725 * according to user attempts to set it, rather than blindly
4730 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
4731 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
4734 dev_set_rx_mode(dev
);
4737 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
4738 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
4740 dev
->gflags
^= IFF_PROMISC
;
4741 dev_set_promiscuity(dev
, inc
);
4744 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4745 is important. Some (broken) drivers set IFF_PROMISC, when
4746 IFF_ALLMULTI is requested not asking us and not reporting.
4748 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
4749 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
4751 dev
->gflags
^= IFF_ALLMULTI
;
4752 dev_set_allmulti(dev
, inc
);
4758 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
)
4760 unsigned int changes
= dev
->flags
^ old_flags
;
4762 if (changes
& IFF_UP
) {
4763 if (dev
->flags
& IFF_UP
)
4764 call_netdevice_notifiers(NETDEV_UP
, dev
);
4766 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
4769 if (dev
->flags
& IFF_UP
&&
4770 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
)))
4771 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
4775 * dev_change_flags - change device settings
4777 * @flags: device state flags
4779 * Change settings on device based state flags. The flags are
4780 * in the userspace exported format.
4782 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4785 unsigned int changes
, old_flags
= dev
->flags
;
4787 ret
= __dev_change_flags(dev
, flags
);
4791 changes
= old_flags
^ dev
->flags
;
4793 rtmsg_ifinfo(RTM_NEWLINK
, dev
, changes
);
4795 __dev_notify_flags(dev
, old_flags
);
4798 EXPORT_SYMBOL(dev_change_flags
);
4801 * dev_set_mtu - Change maximum transfer unit
4803 * @new_mtu: new transfer unit
4805 * Change the maximum transfer size of the network device.
4807 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
4809 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4812 if (new_mtu
== dev
->mtu
)
4815 /* MTU must be positive. */
4819 if (!netif_device_present(dev
))
4823 if (ops
->ndo_change_mtu
)
4824 err
= ops
->ndo_change_mtu(dev
, new_mtu
);
4828 if (!err
&& dev
->flags
& IFF_UP
)
4829 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
4832 EXPORT_SYMBOL(dev_set_mtu
);
4835 * dev_set_group - Change group this device belongs to
4837 * @new_group: group this device should belong to
4839 void dev_set_group(struct net_device
*dev
, int new_group
)
4841 dev
->group
= new_group
;
4843 EXPORT_SYMBOL(dev_set_group
);
4846 * dev_set_mac_address - Change Media Access Control Address
4850 * Change the hardware (MAC) address of the device
4852 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
4854 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4857 if (!ops
->ndo_set_mac_address
)
4859 if (sa
->sa_family
!= dev
->type
)
4861 if (!netif_device_present(dev
))
4863 err
= ops
->ndo_set_mac_address(dev
, sa
);
4865 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4866 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
4869 EXPORT_SYMBOL(dev_set_mac_address
);
4872 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4874 static int dev_ifsioc_locked(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4877 struct net_device
*dev
= dev_get_by_name_rcu(net
, ifr
->ifr_name
);
4883 case SIOCGIFFLAGS
: /* Get interface flags */
4884 ifr
->ifr_flags
= (short) dev_get_flags(dev
);
4887 case SIOCGIFMETRIC
: /* Get the metric on the interface
4888 (currently unused) */
4889 ifr
->ifr_metric
= 0;
4892 case SIOCGIFMTU
: /* Get the MTU of a device */
4893 ifr
->ifr_mtu
= dev
->mtu
;
4898 memset(ifr
->ifr_hwaddr
.sa_data
, 0, sizeof ifr
->ifr_hwaddr
.sa_data
);
4900 memcpy(ifr
->ifr_hwaddr
.sa_data
, dev
->dev_addr
,
4901 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
4902 ifr
->ifr_hwaddr
.sa_family
= dev
->type
;
4910 ifr
->ifr_map
.mem_start
= dev
->mem_start
;
4911 ifr
->ifr_map
.mem_end
= dev
->mem_end
;
4912 ifr
->ifr_map
.base_addr
= dev
->base_addr
;
4913 ifr
->ifr_map
.irq
= dev
->irq
;
4914 ifr
->ifr_map
.dma
= dev
->dma
;
4915 ifr
->ifr_map
.port
= dev
->if_port
;
4919 ifr
->ifr_ifindex
= dev
->ifindex
;
4923 ifr
->ifr_qlen
= dev
->tx_queue_len
;
4927 /* dev_ioctl() should ensure this case
4939 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4941 static int dev_ifsioc(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4944 struct net_device
*dev
= __dev_get_by_name(net
, ifr
->ifr_name
);
4945 const struct net_device_ops
*ops
;
4950 ops
= dev
->netdev_ops
;
4953 case SIOCSIFFLAGS
: /* Set interface flags */
4954 return dev_change_flags(dev
, ifr
->ifr_flags
);
4956 case SIOCSIFMETRIC
: /* Set the metric on the interface
4957 (currently unused) */
4960 case SIOCSIFMTU
: /* Set the MTU of a device */
4961 return dev_set_mtu(dev
, ifr
->ifr_mtu
);
4964 return dev_set_mac_address(dev
, &ifr
->ifr_hwaddr
);
4966 case SIOCSIFHWBROADCAST
:
4967 if (ifr
->ifr_hwaddr
.sa_family
!= dev
->type
)
4969 memcpy(dev
->broadcast
, ifr
->ifr_hwaddr
.sa_data
,
4970 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
4971 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4975 if (ops
->ndo_set_config
) {
4976 if (!netif_device_present(dev
))
4978 return ops
->ndo_set_config(dev
, &ifr
->ifr_map
);
4983 if (!ops
->ndo_set_rx_mode
||
4984 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
4986 if (!netif_device_present(dev
))
4988 return dev_mc_add_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
4991 if (!ops
->ndo_set_rx_mode
||
4992 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
4994 if (!netif_device_present(dev
))
4996 return dev_mc_del_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
4999 if (ifr
->ifr_qlen
< 0)
5001 dev
->tx_queue_len
= ifr
->ifr_qlen
;
5005 ifr
->ifr_newname
[IFNAMSIZ
-1] = '\0';
5006 return dev_change_name(dev
, ifr
->ifr_newname
);
5009 err
= net_hwtstamp_validate(ifr
);
5015 * Unknown or private ioctl
5018 if ((cmd
>= SIOCDEVPRIVATE
&&
5019 cmd
<= SIOCDEVPRIVATE
+ 15) ||
5020 cmd
== SIOCBONDENSLAVE
||
5021 cmd
== SIOCBONDRELEASE
||
5022 cmd
== SIOCBONDSETHWADDR
||
5023 cmd
== SIOCBONDSLAVEINFOQUERY
||
5024 cmd
== SIOCBONDINFOQUERY
||
5025 cmd
== SIOCBONDCHANGEACTIVE
||
5026 cmd
== SIOCGMIIPHY
||
5027 cmd
== SIOCGMIIREG
||
5028 cmd
== SIOCSMIIREG
||
5029 cmd
== SIOCBRADDIF
||
5030 cmd
== SIOCBRDELIF
||
5031 cmd
== SIOCSHWTSTAMP
||
5032 cmd
== SIOCWANDEV
) {
5034 if (ops
->ndo_do_ioctl
) {
5035 if (netif_device_present(dev
))
5036 err
= ops
->ndo_do_ioctl(dev
, ifr
, cmd
);
5048 * This function handles all "interface"-type I/O control requests. The actual
5049 * 'doing' part of this is dev_ifsioc above.
5053 * dev_ioctl - network device ioctl
5054 * @net: the applicable net namespace
5055 * @cmd: command to issue
5056 * @arg: pointer to a struct ifreq in user space
5058 * Issue ioctl functions to devices. This is normally called by the
5059 * user space syscall interfaces but can sometimes be useful for
5060 * other purposes. The return value is the return from the syscall if
5061 * positive or a negative errno code on error.
5064 int dev_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
5070 /* One special case: SIOCGIFCONF takes ifconf argument
5071 and requires shared lock, because it sleeps writing
5075 if (cmd
== SIOCGIFCONF
) {
5077 ret
= dev_ifconf(net
, (char __user
*) arg
);
5081 if (cmd
== SIOCGIFNAME
)
5082 return dev_ifname(net
, (struct ifreq __user
*)arg
);
5084 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
5087 ifr
.ifr_name
[IFNAMSIZ
-1] = 0;
5089 colon
= strchr(ifr
.ifr_name
, ':');
5094 * See which interface the caller is talking about.
5099 * These ioctl calls:
5100 * - can be done by all.
5101 * - atomic and do not require locking.
5112 dev_load(net
, ifr
.ifr_name
);
5114 ret
= dev_ifsioc_locked(net
, &ifr
, cmd
);
5119 if (copy_to_user(arg
, &ifr
,
5120 sizeof(struct ifreq
)))
5126 dev_load(net
, ifr
.ifr_name
);
5128 ret
= dev_ethtool(net
, &ifr
);
5133 if (copy_to_user(arg
, &ifr
,
5134 sizeof(struct ifreq
)))
5140 * These ioctl calls:
5141 * - require superuser power.
5142 * - require strict serialization.
5148 if (!capable(CAP_NET_ADMIN
))
5150 dev_load(net
, ifr
.ifr_name
);
5152 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5157 if (copy_to_user(arg
, &ifr
,
5158 sizeof(struct ifreq
)))
5164 * These ioctl calls:
5165 * - require superuser power.
5166 * - require strict serialization.
5167 * - do not return a value
5177 case SIOCSIFHWBROADCAST
:
5180 case SIOCBONDENSLAVE
:
5181 case SIOCBONDRELEASE
:
5182 case SIOCBONDSETHWADDR
:
5183 case SIOCBONDCHANGEACTIVE
:
5187 if (!capable(CAP_NET_ADMIN
))
5190 case SIOCBONDSLAVEINFOQUERY
:
5191 case SIOCBONDINFOQUERY
:
5192 dev_load(net
, ifr
.ifr_name
);
5194 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5199 /* Get the per device memory space. We can add this but
5200 * currently do not support it */
5202 /* Set the per device memory buffer space.
5203 * Not applicable in our case */
5208 * Unknown or private ioctl.
5211 if (cmd
== SIOCWANDEV
||
5212 (cmd
>= SIOCDEVPRIVATE
&&
5213 cmd
<= SIOCDEVPRIVATE
+ 15)) {
5214 dev_load(net
, ifr
.ifr_name
);
5216 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5218 if (!ret
&& copy_to_user(arg
, &ifr
,
5219 sizeof(struct ifreq
)))
5223 /* Take care of Wireless Extensions */
5224 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
)
5225 return wext_handle_ioctl(net
, &ifr
, cmd
, arg
);
5232 * dev_new_index - allocate an ifindex
5233 * @net: the applicable net namespace
5235 * Returns a suitable unique value for a new device interface
5236 * number. The caller must hold the rtnl semaphore or the
5237 * dev_base_lock to be sure it remains unique.
5239 static int dev_new_index(struct net
*net
)
5245 if (!__dev_get_by_index(net
, ifindex
))
5250 /* Delayed registration/unregisteration */
5251 static LIST_HEAD(net_todo_list
);
5253 static void net_set_todo(struct net_device
*dev
)
5255 list_add_tail(&dev
->todo_list
, &net_todo_list
);
5258 static void rollback_registered_many(struct list_head
*head
)
5260 struct net_device
*dev
, *tmp
;
5262 BUG_ON(dev_boot_phase
);
5265 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
5266 /* Some devices call without registering
5267 * for initialization unwind. Remove those
5268 * devices and proceed with the remaining.
5270 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5271 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5275 list_del(&dev
->unreg_list
);
5278 dev
->dismantle
= true;
5279 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
5282 /* If device is running, close it first. */
5283 dev_close_many(head
);
5285 list_for_each_entry(dev
, head
, unreg_list
) {
5286 /* And unlink it from device chain. */
5287 unlist_netdevice(dev
);
5289 dev
->reg_state
= NETREG_UNREGISTERING
;
5294 list_for_each_entry(dev
, head
, unreg_list
) {
5295 /* Shutdown queueing discipline. */
5299 /* Notify protocols, that we are about to destroy
5300 this device. They should clean all the things.
5302 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5304 if (!dev
->rtnl_link_ops
||
5305 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5306 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
5309 * Flush the unicast and multicast chains
5314 if (dev
->netdev_ops
->ndo_uninit
)
5315 dev
->netdev_ops
->ndo_uninit(dev
);
5317 /* Notifier chain MUST detach us from master device. */
5318 WARN_ON(dev
->master
);
5320 /* Remove entries from kobject tree */
5321 netdev_unregister_kobject(dev
);
5324 /* Process any work delayed until the end of the batch */
5325 dev
= list_first_entry(head
, struct net_device
, unreg_list
);
5326 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH
, dev
);
5330 list_for_each_entry(dev
, head
, unreg_list
)
5334 static void rollback_registered(struct net_device
*dev
)
5338 list_add(&dev
->unreg_list
, &single
);
5339 rollback_registered_many(&single
);
5343 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
5344 netdev_features_t features
)
5346 /* Fix illegal checksum combinations */
5347 if ((features
& NETIF_F_HW_CSUM
) &&
5348 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5349 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
5350 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
5353 /* Fix illegal SG+CSUM combinations. */
5354 if ((features
& NETIF_F_SG
) &&
5355 !(features
& NETIF_F_ALL_CSUM
)) {
5357 "Dropping NETIF_F_SG since no checksum feature.\n");
5358 features
&= ~NETIF_F_SG
;
5361 /* TSO requires that SG is present as well. */
5362 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
5363 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
5364 features
&= ~NETIF_F_ALL_TSO
;
5367 /* TSO ECN requires that TSO is present as well. */
5368 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
5369 features
&= ~NETIF_F_TSO_ECN
;
5371 /* Software GSO depends on SG. */
5372 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
5373 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
5374 features
&= ~NETIF_F_GSO
;
5377 /* UFO needs SG and checksumming */
5378 if (features
& NETIF_F_UFO
) {
5379 /* maybe split UFO into V4 and V6? */
5380 if (!((features
& NETIF_F_GEN_CSUM
) ||
5381 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
5382 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5384 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5385 features
&= ~NETIF_F_UFO
;
5388 if (!(features
& NETIF_F_SG
)) {
5390 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5391 features
&= ~NETIF_F_UFO
;
5398 int __netdev_update_features(struct net_device
*dev
)
5400 netdev_features_t features
;
5405 features
= netdev_get_wanted_features(dev
);
5407 if (dev
->netdev_ops
->ndo_fix_features
)
5408 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
5410 /* driver might be less strict about feature dependencies */
5411 features
= netdev_fix_features(dev
, features
);
5413 if (dev
->features
== features
)
5416 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
5417 &dev
->features
, &features
);
5419 if (dev
->netdev_ops
->ndo_set_features
)
5420 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
5422 if (unlikely(err
< 0)) {
5424 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5425 err
, &features
, &dev
->features
);
5430 dev
->features
= features
;
5436 * netdev_update_features - recalculate device features
5437 * @dev: the device to check
5439 * Recalculate dev->features set and send notifications if it
5440 * has changed. Should be called after driver or hardware dependent
5441 * conditions might have changed that influence the features.
5443 void netdev_update_features(struct net_device
*dev
)
5445 if (__netdev_update_features(dev
))
5446 netdev_features_change(dev
);
5448 EXPORT_SYMBOL(netdev_update_features
);
5451 * netdev_change_features - recalculate device features
5452 * @dev: the device to check
5454 * Recalculate dev->features set and send notifications even
5455 * if they have not changed. Should be called instead of
5456 * netdev_update_features() if also dev->vlan_features might
5457 * have changed to allow the changes to be propagated to stacked
5460 void netdev_change_features(struct net_device
*dev
)
5462 __netdev_update_features(dev
);
5463 netdev_features_change(dev
);
5465 EXPORT_SYMBOL(netdev_change_features
);
5468 * netif_stacked_transfer_operstate - transfer operstate
5469 * @rootdev: the root or lower level device to transfer state from
5470 * @dev: the device to transfer operstate to
5472 * Transfer operational state from root to device. This is normally
5473 * called when a stacking relationship exists between the root
5474 * device and the device(a leaf device).
5476 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
5477 struct net_device
*dev
)
5479 if (rootdev
->operstate
== IF_OPER_DORMANT
)
5480 netif_dormant_on(dev
);
5482 netif_dormant_off(dev
);
5484 if (netif_carrier_ok(rootdev
)) {
5485 if (!netif_carrier_ok(dev
))
5486 netif_carrier_on(dev
);
5488 if (netif_carrier_ok(dev
))
5489 netif_carrier_off(dev
);
5492 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
5495 static int netif_alloc_rx_queues(struct net_device
*dev
)
5497 unsigned int i
, count
= dev
->num_rx_queues
;
5498 struct netdev_rx_queue
*rx
;
5502 rx
= kcalloc(count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5504 pr_err("netdev: Unable to allocate %u rx queues\n", count
);
5509 for (i
= 0; i
< count
; i
++)
5515 static void netdev_init_one_queue(struct net_device
*dev
,
5516 struct netdev_queue
*queue
, void *_unused
)
5518 /* Initialize queue lock */
5519 spin_lock_init(&queue
->_xmit_lock
);
5520 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
5521 queue
->xmit_lock_owner
= -1;
5522 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
5525 dql_init(&queue
->dql
, HZ
);
5529 static int netif_alloc_netdev_queues(struct net_device
*dev
)
5531 unsigned int count
= dev
->num_tx_queues
;
5532 struct netdev_queue
*tx
;
5536 tx
= kcalloc(count
, sizeof(struct netdev_queue
), GFP_KERNEL
);
5538 pr_err("netdev: Unable to allocate %u tx queues\n", count
);
5543 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
5544 spin_lock_init(&dev
->tx_global_lock
);
5550 * register_netdevice - register a network device
5551 * @dev: device to register
5553 * Take a completed network device structure and add it to the kernel
5554 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5555 * chain. 0 is returned on success. A negative errno code is returned
5556 * on a failure to set up the device, or if the name is a duplicate.
5558 * Callers must hold the rtnl semaphore. You may want
5559 * register_netdev() instead of this.
5562 * The locking appears insufficient to guarantee two parallel registers
5563 * will not get the same name.
5566 int register_netdevice(struct net_device
*dev
)
5569 struct net
*net
= dev_net(dev
);
5571 BUG_ON(dev_boot_phase
);
5576 /* When net_device's are persistent, this will be fatal. */
5577 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
5580 spin_lock_init(&dev
->addr_list_lock
);
5581 netdev_set_addr_lockdep_class(dev
);
5585 ret
= dev_get_valid_name(dev
, dev
->name
);
5589 /* Init, if this function is available */
5590 if (dev
->netdev_ops
->ndo_init
) {
5591 ret
= dev
->netdev_ops
->ndo_init(dev
);
5599 dev
->ifindex
= dev_new_index(net
);
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.
5749 * @dev: target net_device
5751 * This is called when unregistering network devices.
5753 * Any protocol or device that holds a reference should register
5754 * for netdevice notification, and cleanup and put back the
5755 * reference if they receive an UNREGISTER event.
5756 * We can get stuck here if buggy protocols don't correctly
5759 static void netdev_wait_allrefs(struct net_device
*dev
)
5761 unsigned long rebroadcast_time
, warning_time
;
5764 linkwatch_forget_dev(dev
);
5766 rebroadcast_time
= warning_time
= jiffies
;
5767 refcnt
= netdev_refcnt_read(dev
);
5769 while (refcnt
!= 0) {
5770 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
5773 /* Rebroadcast unregister notification */
5774 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5775 /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5776 * should have already handle it the first time */
5778 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
5780 /* We must not have linkwatch events
5781 * pending on unregister. If this
5782 * happens, we simply run the queue
5783 * unscheduled, resulting in a noop
5786 linkwatch_run_queue();
5791 rebroadcast_time
= jiffies
;
5796 refcnt
= netdev_refcnt_read(dev
);
5798 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
5799 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
5801 warning_time
= jiffies
;
5810 * register_netdevice(x1);
5811 * register_netdevice(x2);
5813 * unregister_netdevice(y1);
5814 * unregister_netdevice(y2);
5820 * We are invoked by rtnl_unlock().
5821 * This allows us to deal with problems:
5822 * 1) We can delete sysfs objects which invoke hotplug
5823 * without deadlocking with linkwatch via keventd.
5824 * 2) Since we run with the RTNL semaphore not held, we can sleep
5825 * safely in order to wait for the netdev refcnt to drop to zero.
5827 * We must not return until all unregister events added during
5828 * the interval the lock was held have been completed.
5830 void netdev_run_todo(void)
5832 struct list_head list
;
5834 /* Snapshot list, allow later requests */
5835 list_replace_init(&net_todo_list
, &list
);
5839 /* Wait for rcu callbacks to finish before attempting to drain
5840 * the device list. This usually avoids a 250ms wait.
5842 if (!list_empty(&list
))
5845 while (!list_empty(&list
)) {
5846 struct net_device
*dev
5847 = list_first_entry(&list
, struct net_device
, todo_list
);
5848 list_del(&dev
->todo_list
);
5850 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
5851 pr_err("network todo '%s' but state %d\n",
5852 dev
->name
, dev
->reg_state
);
5857 dev
->reg_state
= NETREG_UNREGISTERED
;
5859 on_each_cpu(flush_backlog
, dev
, 1);
5861 netdev_wait_allrefs(dev
);
5864 BUG_ON(netdev_refcnt_read(dev
));
5865 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
5866 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
5867 WARN_ON(dev
->dn_ptr
);
5869 if (dev
->destructor
)
5870 dev
->destructor(dev
);
5872 /* Free network device */
5873 kobject_put(&dev
->dev
.kobj
);
5877 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5878 * fields in the same order, with only the type differing.
5880 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
5881 const struct net_device_stats
*netdev_stats
)
5883 #if BITS_PER_LONG == 64
5884 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
5885 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
5887 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
5888 const unsigned long *src
= (const unsigned long *)netdev_stats
;
5889 u64
*dst
= (u64
*)stats64
;
5891 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
5892 sizeof(*stats64
) / sizeof(u64
));
5893 for (i
= 0; i
< n
; i
++)
5897 EXPORT_SYMBOL(netdev_stats_to_stats64
);
5900 * dev_get_stats - get network device statistics
5901 * @dev: device to get statistics from
5902 * @storage: place to store stats
5904 * Get network statistics from device. Return @storage.
5905 * The device driver may provide its own method by setting
5906 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5907 * otherwise the internal statistics structure is used.
5909 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
5910 struct rtnl_link_stats64
*storage
)
5912 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5914 if (ops
->ndo_get_stats64
) {
5915 memset(storage
, 0, sizeof(*storage
));
5916 ops
->ndo_get_stats64(dev
, storage
);
5917 } else if (ops
->ndo_get_stats
) {
5918 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
5920 netdev_stats_to_stats64(storage
, &dev
->stats
);
5922 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
5925 EXPORT_SYMBOL(dev_get_stats
);
5927 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
5929 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
5931 #ifdef CONFIG_NET_CLS_ACT
5934 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
5937 netdev_init_one_queue(dev
, queue
, NULL
);
5938 queue
->qdisc
= &noop_qdisc
;
5939 queue
->qdisc_sleeping
= &noop_qdisc
;
5940 rcu_assign_pointer(dev
->ingress_queue
, queue
);
5946 * alloc_netdev_mqs - allocate network device
5947 * @sizeof_priv: size of private data to allocate space for
5948 * @name: device name format string
5949 * @setup: callback to initialize device
5950 * @txqs: the number of TX subqueues to allocate
5951 * @rxqs: the number of RX subqueues to allocate
5953 * Allocates a struct net_device with private data area for driver use
5954 * and performs basic initialization. Also allocates subquue structs
5955 * for each queue on the device.
5957 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
5958 void (*setup
)(struct net_device
*),
5959 unsigned int txqs
, unsigned int rxqs
)
5961 struct net_device
*dev
;
5963 struct net_device
*p
;
5965 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
5968 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
5974 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
5979 alloc_size
= sizeof(struct net_device
);
5981 /* ensure 32-byte alignment of private area */
5982 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
5983 alloc_size
+= sizeof_priv
;
5985 /* ensure 32-byte alignment of whole construct */
5986 alloc_size
+= NETDEV_ALIGN
- 1;
5988 p
= kzalloc(alloc_size
, GFP_KERNEL
);
5990 pr_err("alloc_netdev: Unable to allocate device\n");
5994 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
5995 dev
->padded
= (char *)dev
- (char *)p
;
5997 dev
->pcpu_refcnt
= alloc_percpu(int);
5998 if (!dev
->pcpu_refcnt
)
6001 if (dev_addr_init(dev
))
6007 dev_net_set(dev
, &init_net
);
6009 dev
->gso_max_size
= GSO_MAX_SIZE
;
6010 dev
->gso_max_segs
= GSO_MAX_SEGS
;
6012 INIT_LIST_HEAD(&dev
->napi_list
);
6013 INIT_LIST_HEAD(&dev
->unreg_list
);
6014 INIT_LIST_HEAD(&dev
->link_watch_list
);
6015 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
6018 dev
->num_tx_queues
= txqs
;
6019 dev
->real_num_tx_queues
= txqs
;
6020 if (netif_alloc_netdev_queues(dev
))
6024 dev
->num_rx_queues
= rxqs
;
6025 dev
->real_num_rx_queues
= rxqs
;
6026 if (netif_alloc_rx_queues(dev
))
6030 strcpy(dev
->name
, name
);
6031 dev
->group
= INIT_NETDEV_GROUP
;
6039 free_percpu(dev
->pcpu_refcnt
);
6049 EXPORT_SYMBOL(alloc_netdev_mqs
);
6052 * free_netdev - free network device
6055 * This function does the last stage of destroying an allocated device
6056 * interface. The reference to the device object is released.
6057 * If this is the last reference then it will be freed.
6059 void free_netdev(struct net_device
*dev
)
6061 struct napi_struct
*p
, *n
;
6063 release_net(dev_net(dev
));
6070 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
6072 /* Flush device addresses */
6073 dev_addr_flush(dev
);
6075 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
6078 free_percpu(dev
->pcpu_refcnt
);
6079 dev
->pcpu_refcnt
= NULL
;
6081 /* Compatibility with error handling in drivers */
6082 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6083 kfree((char *)dev
- dev
->padded
);
6087 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
6088 dev
->reg_state
= NETREG_RELEASED
;
6090 /* will free via device release */
6091 put_device(&dev
->dev
);
6093 EXPORT_SYMBOL(free_netdev
);
6096 * synchronize_net - Synchronize with packet receive processing
6098 * Wait for packets currently being received to be done.
6099 * Does not block later packets from starting.
6101 void synchronize_net(void)
6104 if (rtnl_is_locked())
6105 synchronize_rcu_expedited();
6109 EXPORT_SYMBOL(synchronize_net
);
6112 * unregister_netdevice_queue - remove device from the kernel
6116 * This function shuts down a device interface and removes it
6117 * from the kernel tables.
6118 * If head not NULL, device is queued to be unregistered later.
6120 * Callers must hold the rtnl semaphore. You may want
6121 * unregister_netdev() instead of this.
6124 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
6129 list_move_tail(&dev
->unreg_list
, head
);
6131 rollback_registered(dev
);
6132 /* Finish processing unregister after unlock */
6136 EXPORT_SYMBOL(unregister_netdevice_queue
);
6139 * unregister_netdevice_many - unregister many devices
6140 * @head: list of devices
6142 void unregister_netdevice_many(struct list_head
*head
)
6144 struct net_device
*dev
;
6146 if (!list_empty(head
)) {
6147 rollback_registered_many(head
);
6148 list_for_each_entry(dev
, head
, unreg_list
)
6152 EXPORT_SYMBOL(unregister_netdevice_many
);
6155 * unregister_netdev - remove device from the kernel
6158 * This function shuts down a device interface and removes it
6159 * from the kernel tables.
6161 * This is just a wrapper for unregister_netdevice that takes
6162 * the rtnl semaphore. In general you want to use this and not
6163 * unregister_netdevice.
6165 void unregister_netdev(struct net_device
*dev
)
6168 unregister_netdevice(dev
);
6171 EXPORT_SYMBOL(unregister_netdev
);
6174 * dev_change_net_namespace - move device to different nethost namespace
6176 * @net: network namespace
6177 * @pat: If not NULL name pattern to try if the current device name
6178 * is already taken in the destination network namespace.
6180 * This function shuts down a device interface and moves it
6181 * to a new network namespace. On success 0 is returned, on
6182 * a failure a netagive errno code is returned.
6184 * Callers must hold the rtnl semaphore.
6187 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
6193 /* Don't allow namespace local devices to be moved. */
6195 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6198 /* Ensure the device has been registrered */
6200 if (dev
->reg_state
!= NETREG_REGISTERED
)
6203 /* Get out if there is nothing todo */
6205 if (net_eq(dev_net(dev
), net
))
6208 /* Pick the destination device name, and ensure
6209 * we can use it in the destination network namespace.
6212 if (__dev_get_by_name(net
, dev
->name
)) {
6213 /* We get here if we can't use the current device name */
6216 if (dev_get_valid_name(dev
, pat
) < 0)
6221 * And now a mini version of register_netdevice unregister_netdevice.
6224 /* If device is running close it first. */
6227 /* And unlink it from device chain */
6229 unlist_netdevice(dev
);
6233 /* Shutdown queueing discipline. */
6236 /* Notify protocols, that we are about to destroy
6237 this device. They should clean all the things.
6239 Note that dev->reg_state stays at NETREG_REGISTERED.
6240 This is wanted because this way 8021q and macvlan know
6241 the device is just moving and can keep their slaves up.
6243 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6244 call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH
, dev
);
6245 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
6248 * Flush the unicast and multicast chains
6253 /* Actually switch the network namespace */
6254 dev_net_set(dev
, net
);
6256 /* If there is an ifindex conflict assign a new one */
6257 if (__dev_get_by_index(net
, dev
->ifindex
)) {
6258 int iflink
= (dev
->iflink
== dev
->ifindex
);
6259 dev
->ifindex
= dev_new_index(net
);
6261 dev
->iflink
= dev
->ifindex
;
6264 /* Fixup kobjects */
6265 err
= device_rename(&dev
->dev
, dev
->name
);
6268 /* Add the device back in the hashes */
6269 list_netdevice(dev
);
6271 /* Notify protocols, that a new device appeared. */
6272 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6275 * Prevent userspace races by waiting until the network
6276 * device is fully setup before sending notifications.
6278 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
6285 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
6287 static int dev_cpu_callback(struct notifier_block
*nfb
,
6288 unsigned long action
,
6291 struct sk_buff
**list_skb
;
6292 struct sk_buff
*skb
;
6293 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
6294 struct softnet_data
*sd
, *oldsd
;
6296 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
6299 local_irq_disable();
6300 cpu
= smp_processor_id();
6301 sd
= &per_cpu(softnet_data
, cpu
);
6302 oldsd
= &per_cpu(softnet_data
, oldcpu
);
6304 /* Find end of our completion_queue. */
6305 list_skb
= &sd
->completion_queue
;
6307 list_skb
= &(*list_skb
)->next
;
6308 /* Append completion queue from offline CPU. */
6309 *list_skb
= oldsd
->completion_queue
;
6310 oldsd
->completion_queue
= NULL
;
6312 /* Append output queue from offline CPU. */
6313 if (oldsd
->output_queue
) {
6314 *sd
->output_queue_tailp
= oldsd
->output_queue
;
6315 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
6316 oldsd
->output_queue
= NULL
;
6317 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
6319 /* Append NAPI poll list from offline CPU. */
6320 if (!list_empty(&oldsd
->poll_list
)) {
6321 list_splice_init(&oldsd
->poll_list
, &sd
->poll_list
);
6322 raise_softirq_irqoff(NET_RX_SOFTIRQ
);
6325 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
6328 /* Process offline CPU's input_pkt_queue */
6329 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
6331 input_queue_head_incr(oldsd
);
6333 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
6335 input_queue_head_incr(oldsd
);
6343 * netdev_increment_features - increment feature set by one
6344 * @all: current feature set
6345 * @one: new feature set
6346 * @mask: mask feature set
6348 * Computes a new feature set after adding a device with feature set
6349 * @one to the master device with current feature set @all. Will not
6350 * enable anything that is off in @mask. Returns the new feature set.
6352 netdev_features_t
netdev_increment_features(netdev_features_t all
,
6353 netdev_features_t one
, netdev_features_t mask
)
6355 if (mask
& NETIF_F_GEN_CSUM
)
6356 mask
|= NETIF_F_ALL_CSUM
;
6357 mask
|= NETIF_F_VLAN_CHALLENGED
;
6359 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
6360 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
6362 /* If one device supports hw checksumming, set for all. */
6363 if (all
& NETIF_F_GEN_CSUM
)
6364 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
6368 EXPORT_SYMBOL(netdev_increment_features
);
6370 static struct hlist_head
*netdev_create_hash(void)
6373 struct hlist_head
*hash
;
6375 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
6377 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
6378 INIT_HLIST_HEAD(&hash
[i
]);
6383 /* Initialize per network namespace state */
6384 static int __net_init
netdev_init(struct net
*net
)
6386 if (net
!= &init_net
)
6387 INIT_LIST_HEAD(&net
->dev_base_head
);
6389 net
->dev_name_head
= netdev_create_hash();
6390 if (net
->dev_name_head
== NULL
)
6393 net
->dev_index_head
= netdev_create_hash();
6394 if (net
->dev_index_head
== NULL
)
6400 kfree(net
->dev_name_head
);
6406 * netdev_drivername - network driver for the device
6407 * @dev: network device
6409 * Determine network driver for device.
6411 const char *netdev_drivername(const struct net_device
*dev
)
6413 const struct device_driver
*driver
;
6414 const struct device
*parent
;
6415 const char *empty
= "";
6417 parent
= dev
->dev
.parent
;
6421 driver
= parent
->driver
;
6422 if (driver
&& driver
->name
)
6423 return driver
->name
;
6427 static int __netdev_printk(const char *level
, const struct net_device
*dev
,
6428 struct va_format
*vaf
)
6432 if (dev
&& dev
->dev
.parent
) {
6433 r
= dev_printk_emit(level
[1] - '0',
6436 dev_driver_string(dev
->dev
.parent
),
6437 dev_name(dev
->dev
.parent
),
6438 netdev_name(dev
), vaf
);
6440 r
= printk("%s%s: %pV", level
, netdev_name(dev
), vaf
);
6442 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
6448 int netdev_printk(const char *level
, const struct net_device
*dev
,
6449 const char *format
, ...)
6451 struct va_format vaf
;
6455 va_start(args
, format
);
6460 r
= __netdev_printk(level
, dev
, &vaf
);
6466 EXPORT_SYMBOL(netdev_printk
);
6468 #define define_netdev_printk_level(func, level) \
6469 int func(const struct net_device *dev, const char *fmt, ...) \
6472 struct va_format vaf; \
6475 va_start(args, fmt); \
6480 r = __netdev_printk(level, dev, &vaf); \
6486 EXPORT_SYMBOL(func);
6488 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
6489 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
6490 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
6491 define_netdev_printk_level(netdev_err
, KERN_ERR
);
6492 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
6493 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
6494 define_netdev_printk_level(netdev_info
, KERN_INFO
);
6496 static void __net_exit
netdev_exit(struct net
*net
)
6498 kfree(net
->dev_name_head
);
6499 kfree(net
->dev_index_head
);
6502 static struct pernet_operations __net_initdata netdev_net_ops
= {
6503 .init
= netdev_init
,
6504 .exit
= netdev_exit
,
6507 static void __net_exit
default_device_exit(struct net
*net
)
6509 struct net_device
*dev
, *aux
;
6511 * Push all migratable network devices back to the
6512 * initial network namespace
6515 for_each_netdev_safe(net
, dev
, aux
) {
6517 char fb_name
[IFNAMSIZ
];
6519 /* Ignore unmoveable devices (i.e. loopback) */
6520 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6523 /* Leave virtual devices for the generic cleanup */
6524 if (dev
->rtnl_link_ops
)
6527 /* Push remaining network devices to init_net */
6528 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
6529 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
6531 pr_emerg("%s: failed to move %s to init_net: %d\n",
6532 __func__
, dev
->name
, err
);
6539 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
6541 /* At exit all network devices most be removed from a network
6542 * namespace. Do this in the reverse order of registration.
6543 * Do this across as many network namespaces as possible to
6544 * improve batching efficiency.
6546 struct net_device
*dev
;
6548 LIST_HEAD(dev_kill_list
);
6551 list_for_each_entry(net
, net_list
, exit_list
) {
6552 for_each_netdev_reverse(net
, dev
) {
6553 if (dev
->rtnl_link_ops
)
6554 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
6556 unregister_netdevice_queue(dev
, &dev_kill_list
);
6559 unregister_netdevice_many(&dev_kill_list
);
6560 list_del(&dev_kill_list
);
6564 static struct pernet_operations __net_initdata default_device_ops
= {
6565 .exit
= default_device_exit
,
6566 .exit_batch
= default_device_exit_batch
,
6570 * Initialize the DEV module. At boot time this walks the device list and
6571 * unhooks any devices that fail to initialise (normally hardware not
6572 * present) and leaves us with a valid list of present and active devices.
6577 * This is called single threaded during boot, so no need
6578 * to take the rtnl semaphore.
6580 static int __init
net_dev_init(void)
6582 int i
, rc
= -ENOMEM
;
6584 BUG_ON(!dev_boot_phase
);
6586 if (dev_proc_init())
6589 if (netdev_kobject_init())
6592 INIT_LIST_HEAD(&ptype_all
);
6593 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
6594 INIT_LIST_HEAD(&ptype_base
[i
]);
6596 if (register_pernet_subsys(&netdev_net_ops
))
6600 * Initialise the packet receive queues.
6603 for_each_possible_cpu(i
) {
6604 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
6606 memset(sd
, 0, sizeof(*sd
));
6607 skb_queue_head_init(&sd
->input_pkt_queue
);
6608 skb_queue_head_init(&sd
->process_queue
);
6609 sd
->completion_queue
= NULL
;
6610 INIT_LIST_HEAD(&sd
->poll_list
);
6611 sd
->output_queue
= NULL
;
6612 sd
->output_queue_tailp
= &sd
->output_queue
;
6614 sd
->csd
.func
= rps_trigger_softirq
;
6620 sd
->backlog
.poll
= process_backlog
;
6621 sd
->backlog
.weight
= weight_p
;
6622 sd
->backlog
.gro_list
= NULL
;
6623 sd
->backlog
.gro_count
= 0;
6628 /* The loopback device is special if any other network devices
6629 * is present in a network namespace the loopback device must
6630 * be present. Since we now dynamically allocate and free the
6631 * loopback device ensure this invariant is maintained by
6632 * keeping the loopback device as the first device on the
6633 * list of network devices. Ensuring the loopback devices
6634 * is the first device that appears and the last network device
6637 if (register_pernet_device(&loopback_net_ops
))
6640 if (register_pernet_device(&default_device_ops
))
6643 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
6644 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
6646 hotcpu_notifier(dev_cpu_callback
, 0);
6654 subsys_initcall(net_dev_init
);
6656 static int __init
initialize_hashrnd(void)
6658 get_random_bytes(&hashrnd
, sizeof(hashrnd
));
6662 late_initcall_sync(initialize_hashrnd
);