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_alloc_name_ns(struct net
*net
,
963 struct net_device
*dev
,
969 ret
= __dev_alloc_name(net
, name
, buf
);
971 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
975 static int dev_get_valid_name(struct net
*net
,
976 struct net_device
*dev
,
981 if (!dev_valid_name(name
))
984 if (strchr(name
, '%'))
985 return dev_alloc_name_ns(net
, dev
, name
);
986 else if (__dev_get_by_name(net
, name
))
988 else if (dev
->name
!= name
)
989 strlcpy(dev
->name
, name
, IFNAMSIZ
);
995 * dev_change_name - change name of a device
997 * @newname: name (or format string) must be at least IFNAMSIZ
999 * Change name of a device, can pass format strings "eth%d".
1002 int dev_change_name(struct net_device
*dev
, const char *newname
)
1004 char oldname
[IFNAMSIZ
];
1010 BUG_ON(!dev_net(dev
));
1013 if (dev
->flags
& IFF_UP
)
1016 if (strncmp(newname
, dev
->name
, IFNAMSIZ
) == 0)
1019 memcpy(oldname
, dev
->name
, IFNAMSIZ
);
1021 err
= dev_get_valid_name(net
, dev
, newname
);
1026 ret
= device_rename(&dev
->dev
, dev
->name
);
1028 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1032 write_lock_bh(&dev_base_lock
);
1033 hlist_del_rcu(&dev
->name_hlist
);
1034 write_unlock_bh(&dev_base_lock
);
1038 write_lock_bh(&dev_base_lock
);
1039 hlist_add_head_rcu(&dev
->name_hlist
, dev_name_hash(net
, dev
->name
));
1040 write_unlock_bh(&dev_base_lock
);
1042 ret
= call_netdevice_notifiers(NETDEV_CHANGENAME
, dev
);
1043 ret
= notifier_to_errno(ret
);
1046 /* err >= 0 after dev_alloc_name() or stores the first errno */
1049 memcpy(dev
->name
, oldname
, IFNAMSIZ
);
1052 pr_err("%s: name change rollback failed: %d\n",
1061 * dev_set_alias - change ifalias of a device
1063 * @alias: name up to IFALIASZ
1064 * @len: limit of bytes to copy from info
1066 * Set ifalias for a device,
1068 int dev_set_alias(struct net_device
*dev
, const char *alias
, size_t len
)
1074 if (len
>= IFALIASZ
)
1079 kfree(dev
->ifalias
);
1080 dev
->ifalias
= NULL
;
1085 new_ifalias
= krealloc(dev
->ifalias
, len
+ 1, GFP_KERNEL
);
1088 dev
->ifalias
= new_ifalias
;
1090 strlcpy(dev
->ifalias
, alias
, len
+1);
1096 * netdev_features_change - device changes features
1097 * @dev: device to cause notification
1099 * Called to indicate a device has changed features.
1101 void netdev_features_change(struct net_device
*dev
)
1103 call_netdevice_notifiers(NETDEV_FEAT_CHANGE
, dev
);
1105 EXPORT_SYMBOL(netdev_features_change
);
1108 * netdev_state_change - device changes state
1109 * @dev: device to cause notification
1111 * Called to indicate a device has changed state. This function calls
1112 * the notifier chains for netdev_chain and sends a NEWLINK message
1113 * to the routing socket.
1115 void netdev_state_change(struct net_device
*dev
)
1117 if (dev
->flags
& IFF_UP
) {
1118 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
1119 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0);
1122 EXPORT_SYMBOL(netdev_state_change
);
1125 * netdev_notify_peers - notify network peers about existence of @dev
1126 * @dev: network device
1128 * Generate traffic such that interested network peers are aware of
1129 * @dev, such as by generating a gratuitous ARP. This may be used when
1130 * a device wants to inform the rest of the network about some sort of
1131 * reconfiguration such as a failover event or virtual machine
1134 void netdev_notify_peers(struct net_device
*dev
)
1137 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS
, dev
);
1140 EXPORT_SYMBOL(netdev_notify_peers
);
1143 * dev_load - load a network module
1144 * @net: the applicable net namespace
1145 * @name: name of interface
1147 * If a network interface is not present and the process has suitable
1148 * privileges this function loads the module. If module loading is not
1149 * available in this kernel then it becomes a nop.
1152 void dev_load(struct net
*net
, const char *name
)
1154 struct net_device
*dev
;
1158 dev
= dev_get_by_name_rcu(net
, name
);
1162 if (no_module
&& capable(CAP_NET_ADMIN
))
1163 no_module
= request_module("netdev-%s", name
);
1164 if (no_module
&& capable(CAP_SYS_MODULE
)) {
1165 if (!request_module("%s", name
))
1166 pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
1170 EXPORT_SYMBOL(dev_load
);
1172 static int __dev_open(struct net_device
*dev
)
1174 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1179 if (!netif_device_present(dev
))
1182 ret
= call_netdevice_notifiers(NETDEV_PRE_UP
, dev
);
1183 ret
= notifier_to_errno(ret
);
1187 set_bit(__LINK_STATE_START
, &dev
->state
);
1189 if (ops
->ndo_validate_addr
)
1190 ret
= ops
->ndo_validate_addr(dev
);
1192 if (!ret
&& ops
->ndo_open
)
1193 ret
= ops
->ndo_open(dev
);
1196 clear_bit(__LINK_STATE_START
, &dev
->state
);
1198 dev
->flags
|= IFF_UP
;
1199 net_dmaengine_get();
1200 dev_set_rx_mode(dev
);
1202 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
1209 * dev_open - prepare an interface for use.
1210 * @dev: device to open
1212 * Takes a device from down to up state. The device's private open
1213 * function is invoked and then the multicast lists are loaded. Finally
1214 * the device is moved into the up state and a %NETDEV_UP message is
1215 * sent to the netdev notifier chain.
1217 * Calling this function on an active interface is a nop. On a failure
1218 * a negative errno code is returned.
1220 int dev_open(struct net_device
*dev
)
1224 if (dev
->flags
& IFF_UP
)
1227 ret
= __dev_open(dev
);
1231 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1232 call_netdevice_notifiers(NETDEV_UP
, dev
);
1236 EXPORT_SYMBOL(dev_open
);
1238 static int __dev_close_many(struct list_head
*head
)
1240 struct net_device
*dev
;
1245 list_for_each_entry(dev
, head
, unreg_list
) {
1246 call_netdevice_notifiers(NETDEV_GOING_DOWN
, dev
);
1248 clear_bit(__LINK_STATE_START
, &dev
->state
);
1250 /* Synchronize to scheduled poll. We cannot touch poll list, it
1251 * can be even on different cpu. So just clear netif_running().
1253 * dev->stop() will invoke napi_disable() on all of it's
1254 * napi_struct instances on this device.
1256 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1259 dev_deactivate_many(head
);
1261 list_for_each_entry(dev
, head
, unreg_list
) {
1262 const struct net_device_ops
*ops
= dev
->netdev_ops
;
1265 * Call the device specific close. This cannot fail.
1266 * Only if device is UP
1268 * We allow it to be called even after a DETACH hot-plug
1274 dev
->flags
&= ~IFF_UP
;
1275 net_dmaengine_put();
1281 static int __dev_close(struct net_device
*dev
)
1286 list_add(&dev
->unreg_list
, &single
);
1287 retval
= __dev_close_many(&single
);
1292 static int dev_close_many(struct list_head
*head
)
1294 struct net_device
*dev
, *tmp
;
1295 LIST_HEAD(tmp_list
);
1297 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
)
1298 if (!(dev
->flags
& IFF_UP
))
1299 list_move(&dev
->unreg_list
, &tmp_list
);
1301 __dev_close_many(head
);
1303 list_for_each_entry(dev
, head
, unreg_list
) {
1304 rtmsg_ifinfo(RTM_NEWLINK
, dev
, IFF_UP
|IFF_RUNNING
);
1305 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
1308 /* rollback_registered_many needs the complete original list */
1309 list_splice(&tmp_list
, head
);
1314 * dev_close - shutdown an interface.
1315 * @dev: device to shutdown
1317 * This function moves an active device into down state. A
1318 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1319 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1322 int dev_close(struct net_device
*dev
)
1324 if (dev
->flags
& IFF_UP
) {
1327 list_add(&dev
->unreg_list
, &single
);
1328 dev_close_many(&single
);
1333 EXPORT_SYMBOL(dev_close
);
1337 * dev_disable_lro - disable Large Receive Offload on a device
1340 * Disable Large Receive Offload (LRO) on a net device. Must be
1341 * called under RTNL. This is needed if received packets may be
1342 * forwarded to another interface.
1344 void dev_disable_lro(struct net_device
*dev
)
1347 * If we're trying to disable lro on a vlan device
1348 * use the underlying physical device instead
1350 if (is_vlan_dev(dev
))
1351 dev
= vlan_dev_real_dev(dev
);
1353 dev
->wanted_features
&= ~NETIF_F_LRO
;
1354 netdev_update_features(dev
);
1356 if (unlikely(dev
->features
& NETIF_F_LRO
))
1357 netdev_WARN(dev
, "failed to disable LRO!\n");
1359 EXPORT_SYMBOL(dev_disable_lro
);
1362 static int dev_boot_phase
= 1;
1365 * register_netdevice_notifier - register a network notifier block
1368 * Register a notifier to be called when network device events occur.
1369 * The notifier passed is linked into the kernel structures and must
1370 * not be reused until it has been unregistered. A negative errno code
1371 * is returned on a failure.
1373 * When registered all registration and up events are replayed
1374 * to the new notifier to allow device to have a race free
1375 * view of the network device list.
1378 int register_netdevice_notifier(struct notifier_block
*nb
)
1380 struct net_device
*dev
;
1381 struct net_device
*last
;
1386 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
1392 for_each_netdev(net
, dev
) {
1393 err
= nb
->notifier_call(nb
, NETDEV_REGISTER
, dev
);
1394 err
= notifier_to_errno(err
);
1398 if (!(dev
->flags
& IFF_UP
))
1401 nb
->notifier_call(nb
, NETDEV_UP
, dev
);
1412 for_each_netdev(net
, dev
) {
1416 if (dev
->flags
& IFF_UP
) {
1417 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1418 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1420 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1425 raw_notifier_chain_unregister(&netdev_chain
, nb
);
1428 EXPORT_SYMBOL(register_netdevice_notifier
);
1431 * unregister_netdevice_notifier - unregister a network notifier block
1434 * Unregister a notifier previously registered by
1435 * register_netdevice_notifier(). The notifier is unlinked into the
1436 * kernel structures and may then be reused. A negative errno code
1437 * is returned on a failure.
1439 * After unregistering unregister and down device events are synthesized
1440 * for all devices on the device list to the removed notifier to remove
1441 * the need for special case cleanup code.
1444 int unregister_netdevice_notifier(struct notifier_block
*nb
)
1446 struct net_device
*dev
;
1451 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1456 for_each_netdev(net
, dev
) {
1457 if (dev
->flags
& IFF_UP
) {
1458 nb
->notifier_call(nb
, NETDEV_GOING_DOWN
, dev
);
1459 nb
->notifier_call(nb
, NETDEV_DOWN
, dev
);
1461 nb
->notifier_call(nb
, NETDEV_UNREGISTER
, dev
);
1468 EXPORT_SYMBOL(unregister_netdevice_notifier
);
1471 * call_netdevice_notifiers - call all network notifier blocks
1472 * @val: value passed unmodified to notifier function
1473 * @dev: net_device pointer passed unmodified to notifier function
1475 * Call all network notifier blocks. Parameters and return value
1476 * are as for raw_notifier_call_chain().
1479 int call_netdevice_notifiers(unsigned long val
, struct net_device
*dev
)
1482 return raw_notifier_call_chain(&netdev_chain
, val
, dev
);
1484 EXPORT_SYMBOL(call_netdevice_notifiers
);
1486 static struct static_key netstamp_needed __read_mostly
;
1487 #ifdef HAVE_JUMP_LABEL
1488 /* We are not allowed to call static_key_slow_dec() from irq context
1489 * If net_disable_timestamp() is called from irq context, defer the
1490 * static_key_slow_dec() calls.
1492 static atomic_t netstamp_needed_deferred
;
1495 void net_enable_timestamp(void)
1497 #ifdef HAVE_JUMP_LABEL
1498 int deferred
= atomic_xchg(&netstamp_needed_deferred
, 0);
1502 static_key_slow_dec(&netstamp_needed
);
1506 WARN_ON(in_interrupt());
1507 static_key_slow_inc(&netstamp_needed
);
1509 EXPORT_SYMBOL(net_enable_timestamp
);
1511 void net_disable_timestamp(void)
1513 #ifdef HAVE_JUMP_LABEL
1514 if (in_interrupt()) {
1515 atomic_inc(&netstamp_needed_deferred
);
1519 static_key_slow_dec(&netstamp_needed
);
1521 EXPORT_SYMBOL(net_disable_timestamp
);
1523 static inline void net_timestamp_set(struct sk_buff
*skb
)
1525 skb
->tstamp
.tv64
= 0;
1526 if (static_key_false(&netstamp_needed
))
1527 __net_timestamp(skb
);
1530 #define net_timestamp_check(COND, SKB) \
1531 if (static_key_false(&netstamp_needed)) { \
1532 if ((COND) && !(SKB)->tstamp.tv64) \
1533 __net_timestamp(SKB); \
1536 static int net_hwtstamp_validate(struct ifreq *ifr)
1538 struct hwtstamp_config cfg
;
1539 enum hwtstamp_tx_types tx_type
;
1540 enum hwtstamp_rx_filters rx_filter
;
1541 int tx_type_valid
= 0;
1542 int rx_filter_valid
= 0;
1544 if (copy_from_user(&cfg
, ifr
->ifr_data
, sizeof(cfg
)))
1547 if (cfg
.flags
) /* reserved for future extensions */
1550 tx_type
= cfg
.tx_type
;
1551 rx_filter
= cfg
.rx_filter
;
1554 case HWTSTAMP_TX_OFF
:
1555 case HWTSTAMP_TX_ON
:
1556 case HWTSTAMP_TX_ONESTEP_SYNC
:
1561 switch (rx_filter
) {
1562 case HWTSTAMP_FILTER_NONE
:
1563 case HWTSTAMP_FILTER_ALL
:
1564 case HWTSTAMP_FILTER_SOME
:
1565 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT
:
1566 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC
:
1567 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ
:
1568 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT
:
1569 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC
:
1570 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ
:
1571 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT
:
1572 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC
:
1573 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ
:
1574 case HWTSTAMP_FILTER_PTP_V2_EVENT
:
1575 case HWTSTAMP_FILTER_PTP_V2_SYNC
:
1576 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ
:
1577 rx_filter_valid
= 1;
1581 if (!tx_type_valid
|| !rx_filter_valid
)
1587 static inline bool is_skb_forwardable(struct net_device
*dev
,
1588 struct sk_buff
*skb
)
1592 if (!(dev
->flags
& IFF_UP
))
1595 len
= dev
->mtu
+ dev
->hard_header_len
+ VLAN_HLEN
;
1596 if (skb
->len
<= len
)
1599 /* if TSO is enabled, we don't care about the length as the packet
1600 * could be forwarded without being segmented before
1602 if (skb_is_gso(skb
))
1609 * dev_forward_skb - loopback an skb to another netif
1611 * @dev: destination network device
1612 * @skb: buffer to forward
1615 * NET_RX_SUCCESS (no congestion)
1616 * NET_RX_DROP (packet was dropped, but freed)
1618 * dev_forward_skb can be used for injecting an skb from the
1619 * start_xmit function of one device into the receive queue
1620 * of another device.
1622 * The receiving device may be in another namespace, so
1623 * we have to clear all information in the skb that could
1624 * impact namespace isolation.
1626 int dev_forward_skb(struct net_device
*dev
, struct sk_buff
*skb
)
1628 if (skb_shinfo(skb
)->tx_flags
& SKBTX_DEV_ZEROCOPY
) {
1629 if (skb_copy_ubufs(skb
, GFP_ATOMIC
)) {
1630 atomic_long_inc(&dev
->rx_dropped
);
1639 if (unlikely(!is_skb_forwardable(dev
, skb
))) {
1640 atomic_long_inc(&dev
->rx_dropped
);
1647 skb
->tstamp
.tv64
= 0;
1648 skb
->pkt_type
= PACKET_HOST
;
1649 skb
->protocol
= eth_type_trans(skb
, dev
);
1653 return netif_rx(skb
);
1655 EXPORT_SYMBOL_GPL(dev_forward_skb
);
1657 static inline int deliver_skb(struct sk_buff
*skb
,
1658 struct packet_type
*pt_prev
,
1659 struct net_device
*orig_dev
)
1661 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
1663 atomic_inc(&skb
->users
);
1664 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1667 static inline bool skb_loop_sk(struct packet_type
*ptype
, struct sk_buff
*skb
)
1669 if (ptype
->af_packet_priv
== NULL
)
1672 if (ptype
->id_match
)
1673 return ptype
->id_match(ptype
, skb
->sk
);
1674 else if ((struct sock
*)ptype
->af_packet_priv
== skb
->sk
)
1681 * Support routine. Sends outgoing frames to any network
1682 * taps currently in use.
1685 static void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1687 struct packet_type
*ptype
;
1688 struct sk_buff
*skb2
= NULL
;
1689 struct packet_type
*pt_prev
= NULL
;
1692 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1693 /* Never send packets back to the socket
1694 * they originated from - MvS (miquels@drinkel.ow.org)
1696 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1697 (!skb_loop_sk(ptype
, skb
))) {
1699 deliver_skb(skb2
, pt_prev
, skb
->dev
);
1704 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1708 net_timestamp_set(skb2
);
1710 /* skb->nh should be correctly
1711 set by sender, so that the second statement is
1712 just protection against buggy protocols.
1714 skb_reset_mac_header(skb2
);
1716 if (skb_network_header(skb2
) < skb2
->data
||
1717 skb2
->network_header
> skb2
->tail
) {
1718 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1719 ntohs(skb2
->protocol
),
1721 skb_reset_network_header(skb2
);
1724 skb2
->transport_header
= skb2
->network_header
;
1725 skb2
->pkt_type
= PACKET_OUTGOING
;
1730 pt_prev
->func(skb2
, skb
->dev
, pt_prev
, skb
->dev
);
1735 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1736 * @dev: Network device
1737 * @txq: number of queues available
1739 * If real_num_tx_queues is changed the tc mappings may no longer be
1740 * valid. To resolve this verify the tc mapping remains valid and if
1741 * not NULL the mapping. With no priorities mapping to this
1742 * offset/count pair it will no longer be used. In the worst case TC0
1743 * is invalid nothing can be done so disable priority mappings. If is
1744 * expected that drivers will fix this mapping if they can before
1745 * calling netif_set_real_num_tx_queues.
1747 static void netif_setup_tc(struct net_device
*dev
, unsigned int txq
)
1750 struct netdev_tc_txq
*tc
= &dev
->tc_to_txq
[0];
1752 /* If TC0 is invalidated disable TC mapping */
1753 if (tc
->offset
+ tc
->count
> txq
) {
1754 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1759 /* Invalidated prio to tc mappings set to TC0 */
1760 for (i
= 1; i
< TC_BITMASK
+ 1; i
++) {
1761 int q
= netdev_get_prio_tc_map(dev
, i
);
1763 tc
= &dev
->tc_to_txq
[q
];
1764 if (tc
->offset
+ tc
->count
> txq
) {
1765 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1767 netdev_set_prio_tc_map(dev
, i
, 0);
1773 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1774 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1776 int netif_set_real_num_tx_queues(struct net_device
*dev
, unsigned int txq
)
1780 if (txq
< 1 || txq
> dev
->num_tx_queues
)
1783 if (dev
->reg_state
== NETREG_REGISTERED
||
1784 dev
->reg_state
== NETREG_UNREGISTERING
) {
1787 rc
= netdev_queue_update_kobjects(dev
, dev
->real_num_tx_queues
,
1793 netif_setup_tc(dev
, txq
);
1795 if (txq
< dev
->real_num_tx_queues
)
1796 qdisc_reset_all_tx_gt(dev
, txq
);
1799 dev
->real_num_tx_queues
= txq
;
1802 EXPORT_SYMBOL(netif_set_real_num_tx_queues
);
1806 * netif_set_real_num_rx_queues - set actual number of RX queues used
1807 * @dev: Network device
1808 * @rxq: Actual number of RX queues
1810 * This must be called either with the rtnl_lock held or before
1811 * registration of the net device. Returns 0 on success, or a
1812 * negative error code. If called before registration, it always
1815 int netif_set_real_num_rx_queues(struct net_device
*dev
, unsigned int rxq
)
1819 if (rxq
< 1 || rxq
> dev
->num_rx_queues
)
1822 if (dev
->reg_state
== NETREG_REGISTERED
) {
1825 rc
= net_rx_queue_update_kobjects(dev
, dev
->real_num_rx_queues
,
1831 dev
->real_num_rx_queues
= rxq
;
1834 EXPORT_SYMBOL(netif_set_real_num_rx_queues
);
1838 * netif_get_num_default_rss_queues - default number of RSS queues
1840 * This routine should set an upper limit on the number of RSS queues
1841 * used by default by multiqueue devices.
1843 int netif_get_num_default_rss_queues(void)
1845 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES
, num_online_cpus());
1847 EXPORT_SYMBOL(netif_get_num_default_rss_queues
);
1849 static inline void __netif_reschedule(struct Qdisc
*q
)
1851 struct softnet_data
*sd
;
1852 unsigned long flags
;
1854 local_irq_save(flags
);
1855 sd
= &__get_cpu_var(softnet_data
);
1856 q
->next_sched
= NULL
;
1857 *sd
->output_queue_tailp
= q
;
1858 sd
->output_queue_tailp
= &q
->next_sched
;
1859 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1860 local_irq_restore(flags
);
1863 void __netif_schedule(struct Qdisc
*q
)
1865 if (!test_and_set_bit(__QDISC_STATE_SCHED
, &q
->state
))
1866 __netif_reschedule(q
);
1868 EXPORT_SYMBOL(__netif_schedule
);
1870 void dev_kfree_skb_irq(struct sk_buff
*skb
)
1872 if (atomic_dec_and_test(&skb
->users
)) {
1873 struct softnet_data
*sd
;
1874 unsigned long flags
;
1876 local_irq_save(flags
);
1877 sd
= &__get_cpu_var(softnet_data
);
1878 skb
->next
= sd
->completion_queue
;
1879 sd
->completion_queue
= skb
;
1880 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1881 local_irq_restore(flags
);
1884 EXPORT_SYMBOL(dev_kfree_skb_irq
);
1886 void dev_kfree_skb_any(struct sk_buff
*skb
)
1888 if (in_irq() || irqs_disabled())
1889 dev_kfree_skb_irq(skb
);
1893 EXPORT_SYMBOL(dev_kfree_skb_any
);
1897 * netif_device_detach - mark device as removed
1898 * @dev: network device
1900 * Mark device as removed from system and therefore no longer available.
1902 void netif_device_detach(struct net_device
*dev
)
1904 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1905 netif_running(dev
)) {
1906 netif_tx_stop_all_queues(dev
);
1909 EXPORT_SYMBOL(netif_device_detach
);
1912 * netif_device_attach - mark device as attached
1913 * @dev: network device
1915 * Mark device as attached from system and restart if needed.
1917 void netif_device_attach(struct net_device
*dev
)
1919 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1920 netif_running(dev
)) {
1921 netif_tx_wake_all_queues(dev
);
1922 __netdev_watchdog_up(dev
);
1925 EXPORT_SYMBOL(netif_device_attach
);
1927 static void skb_warn_bad_offload(const struct sk_buff
*skb
)
1929 static const netdev_features_t null_features
= 0;
1930 struct net_device
*dev
= skb
->dev
;
1931 const char *driver
= "";
1933 if (dev
&& dev
->dev
.parent
)
1934 driver
= dev_driver_string(dev
->dev
.parent
);
1936 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
1937 "gso_type=%d ip_summed=%d\n",
1938 driver
, dev
? &dev
->features
: &null_features
,
1939 skb
->sk
? &skb
->sk
->sk_route_caps
: &null_features
,
1940 skb
->len
, skb
->data_len
, skb_shinfo(skb
)->gso_size
,
1941 skb_shinfo(skb
)->gso_type
, skb
->ip_summed
);
1945 * Invalidate hardware checksum when packet is to be mangled, and
1946 * complete checksum manually on outgoing path.
1948 int skb_checksum_help(struct sk_buff
*skb
)
1951 int ret
= 0, offset
;
1953 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
1954 goto out_set_summed
;
1956 if (unlikely(skb_shinfo(skb
)->gso_size
)) {
1957 skb_warn_bad_offload(skb
);
1961 offset
= skb_checksum_start_offset(skb
);
1962 BUG_ON(offset
>= skb_headlen(skb
));
1963 csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
1965 offset
+= skb
->csum_offset
;
1966 BUG_ON(offset
+ sizeof(__sum16
) > skb_headlen(skb
));
1968 if (skb_cloned(skb
) &&
1969 !skb_clone_writable(skb
, offset
+ sizeof(__sum16
))) {
1970 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
1975 *(__sum16
*)(skb
->data
+ offset
) = csum_fold(csum
);
1977 skb
->ip_summed
= CHECKSUM_NONE
;
1981 EXPORT_SYMBOL(skb_checksum_help
);
1984 * skb_gso_segment - Perform segmentation on skb.
1985 * @skb: buffer to segment
1986 * @features: features for the output path (see dev->features)
1988 * This function segments the given skb and returns a list of segments.
1990 * It may return NULL if the skb requires no segmentation. This is
1991 * only possible when GSO is used for verifying header integrity.
1993 struct sk_buff
*skb_gso_segment(struct sk_buff
*skb
,
1994 netdev_features_t features
)
1996 struct sk_buff
*segs
= ERR_PTR(-EPROTONOSUPPORT
);
1997 struct packet_type
*ptype
;
1998 __be16 type
= skb
->protocol
;
1999 int vlan_depth
= ETH_HLEN
;
2002 while (type
== htons(ETH_P_8021Q
)) {
2003 struct vlan_hdr
*vh
;
2005 if (unlikely(!pskb_may_pull(skb
, vlan_depth
+ VLAN_HLEN
)))
2006 return ERR_PTR(-EINVAL
);
2008 vh
= (struct vlan_hdr
*)(skb
->data
+ vlan_depth
);
2009 type
= vh
->h_vlan_encapsulated_proto
;
2010 vlan_depth
+= VLAN_HLEN
;
2013 skb_reset_mac_header(skb
);
2014 skb
->mac_len
= skb
->network_header
- skb
->mac_header
;
2015 __skb_pull(skb
, skb
->mac_len
);
2017 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2018 skb_warn_bad_offload(skb
);
2020 if (skb_header_cloned(skb
) &&
2021 (err
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
)))
2022 return ERR_PTR(err
);
2026 list_for_each_entry_rcu(ptype
,
2027 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
2028 if (ptype
->type
== type
&& !ptype
->dev
&& ptype
->gso_segment
) {
2029 if (unlikely(skb
->ip_summed
!= CHECKSUM_PARTIAL
)) {
2030 err
= ptype
->gso_send_check(skb
);
2031 segs
= ERR_PTR(err
);
2032 if (err
|| skb_gso_ok(skb
, features
))
2034 __skb_push(skb
, (skb
->data
-
2035 skb_network_header(skb
)));
2037 segs
= ptype
->gso_segment(skb
, features
);
2043 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
2047 EXPORT_SYMBOL(skb_gso_segment
);
2049 /* Take action when hardware reception checksum errors are detected. */
2051 void netdev_rx_csum_fault(struct net_device
*dev
)
2053 if (net_ratelimit()) {
2054 pr_err("%s: hw csum failure\n", dev
? dev
->name
: "<unknown>");
2058 EXPORT_SYMBOL(netdev_rx_csum_fault
);
2061 /* Actually, we should eliminate this check as soon as we know, that:
2062 * 1. IOMMU is present and allows to map all the memory.
2063 * 2. No high memory really exists on this machine.
2066 static int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
2068 #ifdef CONFIG_HIGHMEM
2070 if (!(dev
->features
& NETIF_F_HIGHDMA
)) {
2071 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2072 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2073 if (PageHighMem(skb_frag_page(frag
)))
2078 if (PCI_DMA_BUS_IS_PHYS
) {
2079 struct device
*pdev
= dev
->dev
.parent
;
2083 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++) {
2084 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
2085 dma_addr_t addr
= page_to_phys(skb_frag_page(frag
));
2086 if (!pdev
->dma_mask
|| addr
+ PAGE_SIZE
- 1 > *pdev
->dma_mask
)
2095 void (*destructor
)(struct sk_buff
*skb
);
2098 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2100 static void dev_gso_skb_destructor(struct sk_buff
*skb
)
2102 struct dev_gso_cb
*cb
;
2105 struct sk_buff
*nskb
= skb
->next
;
2107 skb
->next
= nskb
->next
;
2110 } while (skb
->next
);
2112 cb
= DEV_GSO_CB(skb
);
2114 cb
->destructor(skb
);
2118 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2119 * @skb: buffer to segment
2120 * @features: device features as applicable to this skb
2122 * This function segments the given skb and stores the list of segments
2125 static int dev_gso_segment(struct sk_buff
*skb
, netdev_features_t features
)
2127 struct sk_buff
*segs
;
2129 segs
= skb_gso_segment(skb
, features
);
2131 /* Verifying header integrity only. */
2136 return PTR_ERR(segs
);
2139 DEV_GSO_CB(skb
)->destructor
= skb
->destructor
;
2140 skb
->destructor
= dev_gso_skb_destructor
;
2145 static bool can_checksum_protocol(netdev_features_t features
, __be16 protocol
)
2147 return ((features
& NETIF_F_GEN_CSUM
) ||
2148 ((features
& NETIF_F_V4_CSUM
) &&
2149 protocol
== htons(ETH_P_IP
)) ||
2150 ((features
& NETIF_F_V6_CSUM
) &&
2151 protocol
== htons(ETH_P_IPV6
)) ||
2152 ((features
& NETIF_F_FCOE_CRC
) &&
2153 protocol
== htons(ETH_P_FCOE
)));
2156 static netdev_features_t
harmonize_features(struct sk_buff
*skb
,
2157 __be16 protocol
, netdev_features_t features
)
2159 if (skb
->ip_summed
!= CHECKSUM_NONE
&&
2160 !can_checksum_protocol(features
, protocol
)) {
2161 features
&= ~NETIF_F_ALL_CSUM
;
2162 features
&= ~NETIF_F_SG
;
2163 } else if (illegal_highdma(skb
->dev
, skb
)) {
2164 features
&= ~NETIF_F_SG
;
2170 netdev_features_t
netif_skb_features(struct sk_buff
*skb
)
2172 __be16 protocol
= skb
->protocol
;
2173 netdev_features_t features
= skb
->dev
->features
;
2175 if (skb_shinfo(skb
)->gso_segs
> skb
->dev
->gso_max_segs
)
2176 features
&= ~NETIF_F_GSO_MASK
;
2178 if (protocol
== htons(ETH_P_8021Q
)) {
2179 struct vlan_ethhdr
*veh
= (struct vlan_ethhdr
*)skb
->data
;
2180 protocol
= veh
->h_vlan_encapsulated_proto
;
2181 } else if (!vlan_tx_tag_present(skb
)) {
2182 return harmonize_features(skb
, protocol
, features
);
2185 features
&= (skb
->dev
->vlan_features
| NETIF_F_HW_VLAN_TX
);
2187 if (protocol
!= htons(ETH_P_8021Q
)) {
2188 return harmonize_features(skb
, protocol
, features
);
2190 features
&= NETIF_F_SG
| NETIF_F_HIGHDMA
| NETIF_F_FRAGLIST
|
2191 NETIF_F_GEN_CSUM
| NETIF_F_HW_VLAN_TX
;
2192 return harmonize_features(skb
, protocol
, features
);
2195 EXPORT_SYMBOL(netif_skb_features
);
2198 * Returns true if either:
2199 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2200 * 2. skb is fragmented and the device does not support SG.
2202 static inline int skb_needs_linearize(struct sk_buff
*skb
,
2205 return skb_is_nonlinear(skb
) &&
2206 ((skb_has_frag_list(skb
) &&
2207 !(features
& NETIF_F_FRAGLIST
)) ||
2208 (skb_shinfo(skb
)->nr_frags
&&
2209 !(features
& NETIF_F_SG
)));
2212 int dev_hard_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
,
2213 struct netdev_queue
*txq
)
2215 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2216 int rc
= NETDEV_TX_OK
;
2217 unsigned int skb_len
;
2219 if (likely(!skb
->next
)) {
2220 netdev_features_t features
;
2223 * If device doesn't need skb->dst, release it right now while
2224 * its hot in this cpu cache
2226 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2229 features
= netif_skb_features(skb
);
2231 if (vlan_tx_tag_present(skb
) &&
2232 !(features
& NETIF_F_HW_VLAN_TX
)) {
2233 skb
= __vlan_put_tag(skb
, vlan_tx_tag_get(skb
));
2240 if (netif_needs_gso(skb
, features
)) {
2241 if (unlikely(dev_gso_segment(skb
, features
)))
2246 if (skb_needs_linearize(skb
, features
) &&
2247 __skb_linearize(skb
))
2250 /* If packet is not checksummed and device does not
2251 * support checksumming for this protocol, complete
2252 * checksumming here.
2254 if (skb
->ip_summed
== CHECKSUM_PARTIAL
) {
2255 skb_set_transport_header(skb
,
2256 skb_checksum_start_offset(skb
));
2257 if (!(features
& NETIF_F_ALL_CSUM
) &&
2258 skb_checksum_help(skb
))
2263 if (!list_empty(&ptype_all
))
2264 dev_queue_xmit_nit(skb
, dev
);
2267 rc
= ops
->ndo_start_xmit(skb
, dev
);
2268 trace_net_dev_xmit(skb
, rc
, dev
, skb_len
);
2269 if (rc
== NETDEV_TX_OK
)
2270 txq_trans_update(txq
);
2276 struct sk_buff
*nskb
= skb
->next
;
2278 skb
->next
= nskb
->next
;
2282 * If device doesn't need nskb->dst, release it right now while
2283 * its hot in this cpu cache
2285 if (dev
->priv_flags
& IFF_XMIT_DST_RELEASE
)
2288 if (!list_empty(&ptype_all
))
2289 dev_queue_xmit_nit(nskb
, dev
);
2291 skb_len
= nskb
->len
;
2292 rc
= ops
->ndo_start_xmit(nskb
, dev
);
2293 trace_net_dev_xmit(nskb
, rc
, dev
, skb_len
);
2294 if (unlikely(rc
!= NETDEV_TX_OK
)) {
2295 if (rc
& ~NETDEV_TX_MASK
)
2296 goto out_kfree_gso_skb
;
2297 nskb
->next
= skb
->next
;
2301 txq_trans_update(txq
);
2302 if (unlikely(netif_xmit_stopped(txq
) && skb
->next
))
2303 return NETDEV_TX_BUSY
;
2304 } while (skb
->next
);
2307 if (likely(skb
->next
== NULL
))
2308 skb
->destructor
= DEV_GSO_CB(skb
)->destructor
;
2315 static u32 hashrnd __read_mostly
;
2318 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2319 * to be used as a distribution range.
2321 u16
__skb_tx_hash(const struct net_device
*dev
, const struct sk_buff
*skb
,
2322 unsigned int num_tx_queues
)
2326 u16 qcount
= num_tx_queues
;
2328 if (skb_rx_queue_recorded(skb
)) {
2329 hash
= skb_get_rx_queue(skb
);
2330 while (unlikely(hash
>= num_tx_queues
))
2331 hash
-= num_tx_queues
;
2336 u8 tc
= netdev_get_prio_tc_map(dev
, skb
->priority
);
2337 qoffset
= dev
->tc_to_txq
[tc
].offset
;
2338 qcount
= dev
->tc_to_txq
[tc
].count
;
2341 if (skb
->sk
&& skb
->sk
->sk_hash
)
2342 hash
= skb
->sk
->sk_hash
;
2344 hash
= (__force u16
) skb
->protocol
;
2345 hash
= jhash_1word(hash
, hashrnd
);
2347 return (u16
) (((u64
) hash
* qcount
) >> 32) + qoffset
;
2349 EXPORT_SYMBOL(__skb_tx_hash
);
2351 static inline u16
dev_cap_txqueue(struct net_device
*dev
, u16 queue_index
)
2353 if (unlikely(queue_index
>= dev
->real_num_tx_queues
)) {
2354 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
2355 dev
->name
, queue_index
,
2356 dev
->real_num_tx_queues
);
2362 static inline int get_xps_queue(struct net_device
*dev
, struct sk_buff
*skb
)
2365 struct xps_dev_maps
*dev_maps
;
2366 struct xps_map
*map
;
2367 int queue_index
= -1;
2370 dev_maps
= rcu_dereference(dev
->xps_maps
);
2372 map
= rcu_dereference(
2373 dev_maps
->cpu_map
[raw_smp_processor_id()]);
2376 queue_index
= map
->queues
[0];
2379 if (skb
->sk
&& skb
->sk
->sk_hash
)
2380 hash
= skb
->sk
->sk_hash
;
2382 hash
= (__force u16
) skb
->protocol
^
2384 hash
= jhash_1word(hash
, hashrnd
);
2385 queue_index
= map
->queues
[
2386 ((u64
)hash
* map
->len
) >> 32];
2388 if (unlikely(queue_index
>= dev
->real_num_tx_queues
))
2400 struct netdev_queue
*netdev_pick_tx(struct net_device
*dev
,
2401 struct sk_buff
*skb
)
2404 const struct net_device_ops
*ops
= dev
->netdev_ops
;
2406 if (dev
->real_num_tx_queues
== 1)
2408 else if (ops
->ndo_select_queue
) {
2409 queue_index
= ops
->ndo_select_queue(dev
, skb
);
2410 queue_index
= dev_cap_txqueue(dev
, queue_index
);
2412 struct sock
*sk
= skb
->sk
;
2413 queue_index
= sk_tx_queue_get(sk
);
2415 if (queue_index
< 0 || skb
->ooo_okay
||
2416 queue_index
>= dev
->real_num_tx_queues
) {
2417 int old_index
= queue_index
;
2419 queue_index
= get_xps_queue(dev
, skb
);
2420 if (queue_index
< 0)
2421 queue_index
= skb_tx_hash(dev
, skb
);
2423 if (queue_index
!= old_index
&& sk
) {
2424 struct dst_entry
*dst
=
2425 rcu_dereference_check(sk
->sk_dst_cache
, 1);
2427 if (dst
&& skb_dst(skb
) == dst
)
2428 sk_tx_queue_set(sk
, queue_index
);
2433 skb_set_queue_mapping(skb
, queue_index
);
2434 return netdev_get_tx_queue(dev
, queue_index
);
2437 static inline int __dev_xmit_skb(struct sk_buff
*skb
, struct Qdisc
*q
,
2438 struct net_device
*dev
,
2439 struct netdev_queue
*txq
)
2441 spinlock_t
*root_lock
= qdisc_lock(q
);
2445 qdisc_skb_cb(skb
)->pkt_len
= skb
->len
;
2446 qdisc_calculate_pkt_len(skb
, q
);
2448 * Heuristic to force contended enqueues to serialize on a
2449 * separate lock before trying to get qdisc main lock.
2450 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2451 * and dequeue packets faster.
2453 contended
= qdisc_is_running(q
);
2454 if (unlikely(contended
))
2455 spin_lock(&q
->busylock
);
2457 spin_lock(root_lock
);
2458 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
))) {
2461 } else if ((q
->flags
& TCQ_F_CAN_BYPASS
) && !qdisc_qlen(q
) &&
2462 qdisc_run_begin(q
)) {
2464 * This is a work-conserving queue; there are no old skbs
2465 * waiting to be sent out; and the qdisc is not running -
2466 * xmit the skb directly.
2468 if (!(dev
->priv_flags
& IFF_XMIT_DST_RELEASE
))
2471 qdisc_bstats_update(q
, skb
);
2473 if (sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
)) {
2474 if (unlikely(contended
)) {
2475 spin_unlock(&q
->busylock
);
2482 rc
= NET_XMIT_SUCCESS
;
2485 rc
= q
->enqueue(skb
, q
) & NET_XMIT_MASK
;
2486 if (qdisc_run_begin(q
)) {
2487 if (unlikely(contended
)) {
2488 spin_unlock(&q
->busylock
);
2494 spin_unlock(root_lock
);
2495 if (unlikely(contended
))
2496 spin_unlock(&q
->busylock
);
2500 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
2501 static void skb_update_prio(struct sk_buff
*skb
)
2503 struct netprio_map
*map
= rcu_dereference_bh(skb
->dev
->priomap
);
2505 if (!skb
->priority
&& skb
->sk
&& map
) {
2506 unsigned int prioidx
= skb
->sk
->sk_cgrp_prioidx
;
2508 if (prioidx
< map
->priomap_len
)
2509 skb
->priority
= map
->priomap
[prioidx
];
2513 #define skb_update_prio(skb)
2516 static DEFINE_PER_CPU(int, xmit_recursion
);
2517 #define RECURSION_LIMIT 10
2520 * dev_loopback_xmit - loop back @skb
2521 * @skb: buffer to transmit
2523 int dev_loopback_xmit(struct sk_buff
*skb
)
2525 skb_reset_mac_header(skb
);
2526 __skb_pull(skb
, skb_network_offset(skb
));
2527 skb
->pkt_type
= PACKET_LOOPBACK
;
2528 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
2529 WARN_ON(!skb_dst(skb
));
2534 EXPORT_SYMBOL(dev_loopback_xmit
);
2537 * dev_queue_xmit - transmit a buffer
2538 * @skb: buffer to transmit
2540 * Queue a buffer for transmission to a network device. The caller must
2541 * have set the device and priority and built the buffer before calling
2542 * this function. The function can be called from an interrupt.
2544 * A negative errno code is returned on a failure. A success does not
2545 * guarantee the frame will be transmitted as it may be dropped due
2546 * to congestion or traffic shaping.
2548 * -----------------------------------------------------------------------------------
2549 * I notice this method can also return errors from the queue disciplines,
2550 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2553 * Regardless of the return value, the skb is consumed, so it is currently
2554 * difficult to retry a send to this method. (You can bump the ref count
2555 * before sending to hold a reference for retry if you are careful.)
2557 * When calling this method, interrupts MUST be enabled. This is because
2558 * the BH enable code must have IRQs enabled so that it will not deadlock.
2561 int dev_queue_xmit(struct sk_buff
*skb
)
2563 struct net_device
*dev
= skb
->dev
;
2564 struct netdev_queue
*txq
;
2568 /* Disable soft irqs for various locks below. Also
2569 * stops preemption for RCU.
2573 skb_update_prio(skb
);
2575 txq
= netdev_pick_tx(dev
, skb
);
2576 q
= rcu_dereference_bh(txq
->qdisc
);
2578 #ifdef CONFIG_NET_CLS_ACT
2579 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_EGRESS
);
2581 trace_net_dev_queue(skb
);
2583 rc
= __dev_xmit_skb(skb
, q
, dev
, txq
);
2587 /* The device has no queue. Common case for software devices:
2588 loopback, all the sorts of tunnels...
2590 Really, it is unlikely that netif_tx_lock protection is necessary
2591 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2593 However, it is possible, that they rely on protection
2596 Check this and shot the lock. It is not prone from deadlocks.
2597 Either shot noqueue qdisc, it is even simpler 8)
2599 if (dev
->flags
& IFF_UP
) {
2600 int cpu
= smp_processor_id(); /* ok because BHs are off */
2602 if (txq
->xmit_lock_owner
!= cpu
) {
2604 if (__this_cpu_read(xmit_recursion
) > RECURSION_LIMIT
)
2605 goto recursion_alert
;
2607 HARD_TX_LOCK(dev
, txq
, cpu
);
2609 if (!netif_xmit_stopped(txq
)) {
2610 __this_cpu_inc(xmit_recursion
);
2611 rc
= dev_hard_start_xmit(skb
, dev
, txq
);
2612 __this_cpu_dec(xmit_recursion
);
2613 if (dev_xmit_complete(rc
)) {
2614 HARD_TX_UNLOCK(dev
, txq
);
2618 HARD_TX_UNLOCK(dev
, txq
);
2619 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2622 /* Recursion is detected! It is possible,
2626 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2632 rcu_read_unlock_bh();
2637 rcu_read_unlock_bh();
2640 EXPORT_SYMBOL(dev_queue_xmit
);
2643 /*=======================================================================
2645 =======================================================================*/
2647 int netdev_max_backlog __read_mostly
= 1000;
2648 EXPORT_SYMBOL(netdev_max_backlog
);
2650 int netdev_tstamp_prequeue __read_mostly
= 1;
2651 int netdev_budget __read_mostly
= 300;
2652 int weight_p __read_mostly
= 64; /* old backlog weight */
2654 /* Called with irq disabled */
2655 static inline void ____napi_schedule(struct softnet_data
*sd
,
2656 struct napi_struct
*napi
)
2658 list_add_tail(&napi
->poll_list
, &sd
->poll_list
);
2659 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2663 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2664 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2665 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2666 * if hash is a canonical 4-tuple hash over transport ports.
2668 void __skb_get_rxhash(struct sk_buff
*skb
)
2670 struct flow_keys keys
;
2673 if (!skb_flow_dissect(skb
, &keys
))
2679 /* get a consistent hash (same value on both flow directions) */
2680 if (((__force u32
)keys
.dst
< (__force u32
)keys
.src
) ||
2681 (((__force u32
)keys
.dst
== (__force u32
)keys
.src
) &&
2682 ((__force u16
)keys
.port16
[1] < (__force u16
)keys
.port16
[0]))) {
2683 swap(keys
.dst
, keys
.src
);
2684 swap(keys
.port16
[0], keys
.port16
[1]);
2687 hash
= jhash_3words((__force u32
)keys
.dst
,
2688 (__force u32
)keys
.src
,
2689 (__force u32
)keys
.ports
, hashrnd
);
2695 EXPORT_SYMBOL(__skb_get_rxhash
);
2699 /* One global table that all flow-based protocols share. */
2700 struct rps_sock_flow_table __rcu
*rps_sock_flow_table __read_mostly
;
2701 EXPORT_SYMBOL(rps_sock_flow_table
);
2703 struct static_key rps_needed __read_mostly
;
2705 static struct rps_dev_flow
*
2706 set_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2707 struct rps_dev_flow
*rflow
, u16 next_cpu
)
2709 if (next_cpu
!= RPS_NO_CPU
) {
2710 #ifdef CONFIG_RFS_ACCEL
2711 struct netdev_rx_queue
*rxqueue
;
2712 struct rps_dev_flow_table
*flow_table
;
2713 struct rps_dev_flow
*old_rflow
;
2718 /* Should we steer this flow to a different hardware queue? */
2719 if (!skb_rx_queue_recorded(skb
) || !dev
->rx_cpu_rmap
||
2720 !(dev
->features
& NETIF_F_NTUPLE
))
2722 rxq_index
= cpu_rmap_lookup_index(dev
->rx_cpu_rmap
, next_cpu
);
2723 if (rxq_index
== skb_get_rx_queue(skb
))
2726 rxqueue
= dev
->_rx
+ rxq_index
;
2727 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2730 flow_id
= skb
->rxhash
& flow_table
->mask
;
2731 rc
= dev
->netdev_ops
->ndo_rx_flow_steer(dev
, skb
,
2732 rxq_index
, flow_id
);
2736 rflow
= &flow_table
->flows
[flow_id
];
2738 if (old_rflow
->filter
== rflow
->filter
)
2739 old_rflow
->filter
= RPS_NO_FILTER
;
2743 per_cpu(softnet_data
, next_cpu
).input_queue_head
;
2746 rflow
->cpu
= next_cpu
;
2751 * get_rps_cpu is called from netif_receive_skb and returns the target
2752 * CPU from the RPS map of the receiving queue for a given skb.
2753 * rcu_read_lock must be held on entry.
2755 static int get_rps_cpu(struct net_device
*dev
, struct sk_buff
*skb
,
2756 struct rps_dev_flow
**rflowp
)
2758 struct netdev_rx_queue
*rxqueue
;
2759 struct rps_map
*map
;
2760 struct rps_dev_flow_table
*flow_table
;
2761 struct rps_sock_flow_table
*sock_flow_table
;
2765 if (skb_rx_queue_recorded(skb
)) {
2766 u16 index
= skb_get_rx_queue(skb
);
2767 if (unlikely(index
>= dev
->real_num_rx_queues
)) {
2768 WARN_ONCE(dev
->real_num_rx_queues
> 1,
2769 "%s received packet on queue %u, but number "
2770 "of RX queues is %u\n",
2771 dev
->name
, index
, dev
->real_num_rx_queues
);
2774 rxqueue
= dev
->_rx
+ index
;
2778 map
= rcu_dereference(rxqueue
->rps_map
);
2780 if (map
->len
== 1 &&
2781 !rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2782 tcpu
= map
->cpus
[0];
2783 if (cpu_online(tcpu
))
2787 } else if (!rcu_access_pointer(rxqueue
->rps_flow_table
)) {
2791 skb_reset_network_header(skb
);
2792 if (!skb_get_rxhash(skb
))
2795 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2796 sock_flow_table
= rcu_dereference(rps_sock_flow_table
);
2797 if (flow_table
&& sock_flow_table
) {
2799 struct rps_dev_flow
*rflow
;
2801 rflow
= &flow_table
->flows
[skb
->rxhash
& flow_table
->mask
];
2804 next_cpu
= sock_flow_table
->ents
[skb
->rxhash
&
2805 sock_flow_table
->mask
];
2808 * If the desired CPU (where last recvmsg was done) is
2809 * different from current CPU (one in the rx-queue flow
2810 * table entry), switch if one of the following holds:
2811 * - Current CPU is unset (equal to RPS_NO_CPU).
2812 * - Current CPU is offline.
2813 * - The current CPU's queue tail has advanced beyond the
2814 * last packet that was enqueued using this table entry.
2815 * This guarantees that all previous packets for the flow
2816 * have been dequeued, thus preserving in order delivery.
2818 if (unlikely(tcpu
!= next_cpu
) &&
2819 (tcpu
== RPS_NO_CPU
|| !cpu_online(tcpu
) ||
2820 ((int)(per_cpu(softnet_data
, tcpu
).input_queue_head
-
2821 rflow
->last_qtail
)) >= 0))
2822 rflow
= set_rps_cpu(dev
, skb
, rflow
, next_cpu
);
2824 if (tcpu
!= RPS_NO_CPU
&& cpu_online(tcpu
)) {
2832 tcpu
= map
->cpus
[((u64
) skb
->rxhash
* map
->len
) >> 32];
2834 if (cpu_online(tcpu
)) {
2844 #ifdef CONFIG_RFS_ACCEL
2847 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2848 * @dev: Device on which the filter was set
2849 * @rxq_index: RX queue index
2850 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2851 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2853 * Drivers that implement ndo_rx_flow_steer() should periodically call
2854 * this function for each installed filter and remove the filters for
2855 * which it returns %true.
2857 bool rps_may_expire_flow(struct net_device
*dev
, u16 rxq_index
,
2858 u32 flow_id
, u16 filter_id
)
2860 struct netdev_rx_queue
*rxqueue
= dev
->_rx
+ rxq_index
;
2861 struct rps_dev_flow_table
*flow_table
;
2862 struct rps_dev_flow
*rflow
;
2867 flow_table
= rcu_dereference(rxqueue
->rps_flow_table
);
2868 if (flow_table
&& flow_id
<= flow_table
->mask
) {
2869 rflow
= &flow_table
->flows
[flow_id
];
2870 cpu
= ACCESS_ONCE(rflow
->cpu
);
2871 if (rflow
->filter
== filter_id
&& cpu
!= RPS_NO_CPU
&&
2872 ((int)(per_cpu(softnet_data
, cpu
).input_queue_head
-
2873 rflow
->last_qtail
) <
2874 (int)(10 * flow_table
->mask
)))
2880 EXPORT_SYMBOL(rps_may_expire_flow
);
2882 #endif /* CONFIG_RFS_ACCEL */
2884 /* Called from hardirq (IPI) context */
2885 static void rps_trigger_softirq(void *data
)
2887 struct softnet_data
*sd
= data
;
2889 ____napi_schedule(sd
, &sd
->backlog
);
2893 #endif /* CONFIG_RPS */
2896 * Check if this softnet_data structure is another cpu one
2897 * If yes, queue it to our IPI list and return 1
2900 static int rps_ipi_queued(struct softnet_data
*sd
)
2903 struct softnet_data
*mysd
= &__get_cpu_var(softnet_data
);
2906 sd
->rps_ipi_next
= mysd
->rps_ipi_list
;
2907 mysd
->rps_ipi_list
= sd
;
2909 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
2912 #endif /* CONFIG_RPS */
2917 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
2918 * queue (may be a remote CPU queue).
2920 static int enqueue_to_backlog(struct sk_buff
*skb
, int cpu
,
2921 unsigned int *qtail
)
2923 struct softnet_data
*sd
;
2924 unsigned long flags
;
2926 sd
= &per_cpu(softnet_data
, cpu
);
2928 local_irq_save(flags
);
2931 if (skb_queue_len(&sd
->input_pkt_queue
) <= netdev_max_backlog
) {
2932 if (skb_queue_len(&sd
->input_pkt_queue
)) {
2934 __skb_queue_tail(&sd
->input_pkt_queue
, skb
);
2935 input_queue_tail_incr_save(sd
, qtail
);
2937 local_irq_restore(flags
);
2938 return NET_RX_SUCCESS
;
2941 /* Schedule NAPI for backlog device
2942 * We can use non atomic operation since we own the queue lock
2944 if (!__test_and_set_bit(NAPI_STATE_SCHED
, &sd
->backlog
.state
)) {
2945 if (!rps_ipi_queued(sd
))
2946 ____napi_schedule(sd
, &sd
->backlog
);
2954 local_irq_restore(flags
);
2956 atomic_long_inc(&skb
->dev
->rx_dropped
);
2962 * netif_rx - post buffer to the network code
2963 * @skb: buffer to post
2965 * This function receives a packet from a device driver and queues it for
2966 * the upper (protocol) levels to process. It always succeeds. The buffer
2967 * may be dropped during processing for congestion control or by the
2971 * NET_RX_SUCCESS (no congestion)
2972 * NET_RX_DROP (packet was dropped)
2976 int netif_rx(struct sk_buff
*skb
)
2980 /* if netpoll wants it, pretend we never saw it */
2981 if (netpoll_rx(skb
))
2984 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
2986 trace_netif_rx(skb
);
2988 if (static_key_false(&rps_needed
)) {
2989 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
2995 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
2997 cpu
= smp_processor_id();
2999 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3007 ret
= enqueue_to_backlog(skb
, get_cpu(), &qtail
);
3012 EXPORT_SYMBOL(netif_rx
);
3014 int netif_rx_ni(struct sk_buff
*skb
)
3019 err
= netif_rx(skb
);
3020 if (local_softirq_pending())
3026 EXPORT_SYMBOL(netif_rx_ni
);
3028 static void net_tx_action(struct softirq_action
*h
)
3030 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3032 if (sd
->completion_queue
) {
3033 struct sk_buff
*clist
;
3035 local_irq_disable();
3036 clist
= sd
->completion_queue
;
3037 sd
->completion_queue
= NULL
;
3041 struct sk_buff
*skb
= clist
;
3042 clist
= clist
->next
;
3044 WARN_ON(atomic_read(&skb
->users
));
3045 trace_kfree_skb(skb
, net_tx_action
);
3050 if (sd
->output_queue
) {
3053 local_irq_disable();
3054 head
= sd
->output_queue
;
3055 sd
->output_queue
= NULL
;
3056 sd
->output_queue_tailp
= &sd
->output_queue
;
3060 struct Qdisc
*q
= head
;
3061 spinlock_t
*root_lock
;
3063 head
= head
->next_sched
;
3065 root_lock
= qdisc_lock(q
);
3066 if (spin_trylock(root_lock
)) {
3067 smp_mb__before_clear_bit();
3068 clear_bit(__QDISC_STATE_SCHED
,
3071 spin_unlock(root_lock
);
3073 if (!test_bit(__QDISC_STATE_DEACTIVATED
,
3075 __netif_reschedule(q
);
3077 smp_mb__before_clear_bit();
3078 clear_bit(__QDISC_STATE_SCHED
,
3086 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3087 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3088 /* This hook is defined here for ATM LANE */
3089 int (*br_fdb_test_addr_hook
)(struct net_device
*dev
,
3090 unsigned char *addr
) __read_mostly
;
3091 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook
);
3094 #ifdef CONFIG_NET_CLS_ACT
3095 /* TODO: Maybe we should just force sch_ingress to be compiled in
3096 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3097 * a compare and 2 stores extra right now if we dont have it on
3098 * but have CONFIG_NET_CLS_ACT
3099 * NOTE: This doesn't stop any functionality; if you dont have
3100 * the ingress scheduler, you just can't add policies on ingress.
3103 static int ing_filter(struct sk_buff
*skb
, struct netdev_queue
*rxq
)
3105 struct net_device
*dev
= skb
->dev
;
3106 u32 ttl
= G_TC_RTTL(skb
->tc_verd
);
3107 int result
= TC_ACT_OK
;
3110 if (unlikely(MAX_RED_LOOP
< ttl
++)) {
3111 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3112 skb
->skb_iif
, dev
->ifindex
);
3116 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
, ttl
);
3117 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
, AT_INGRESS
);
3120 if (q
!= &noop_qdisc
) {
3121 spin_lock(qdisc_lock(q
));
3122 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
3123 result
= qdisc_enqueue_root(skb
, q
);
3124 spin_unlock(qdisc_lock(q
));
3130 static inline struct sk_buff
*handle_ing(struct sk_buff
*skb
,
3131 struct packet_type
**pt_prev
,
3132 int *ret
, struct net_device
*orig_dev
)
3134 struct netdev_queue
*rxq
= rcu_dereference(skb
->dev
->ingress_queue
);
3136 if (!rxq
|| rxq
->qdisc
== &noop_qdisc
)
3140 *ret
= deliver_skb(skb
, *pt_prev
, orig_dev
);
3144 switch (ing_filter(skb
, rxq
)) {
3158 * netdev_rx_handler_register - register receive handler
3159 * @dev: device to register a handler for
3160 * @rx_handler: receive handler to register
3161 * @rx_handler_data: data pointer that is used by rx handler
3163 * Register a receive hander for a device. This handler will then be
3164 * called from __netif_receive_skb. A negative errno code is returned
3167 * The caller must hold the rtnl_mutex.
3169 * For a general description of rx_handler, see enum rx_handler_result.
3171 int netdev_rx_handler_register(struct net_device
*dev
,
3172 rx_handler_func_t
*rx_handler
,
3173 void *rx_handler_data
)
3177 if (dev
->rx_handler
)
3180 rcu_assign_pointer(dev
->rx_handler_data
, rx_handler_data
);
3181 rcu_assign_pointer(dev
->rx_handler
, rx_handler
);
3185 EXPORT_SYMBOL_GPL(netdev_rx_handler_register
);
3188 * netdev_rx_handler_unregister - unregister receive handler
3189 * @dev: device to unregister a handler from
3191 * Unregister a receive hander from a device.
3193 * The caller must hold the rtnl_mutex.
3195 void netdev_rx_handler_unregister(struct net_device
*dev
)
3199 RCU_INIT_POINTER(dev
->rx_handler
, NULL
);
3200 RCU_INIT_POINTER(dev
->rx_handler_data
, NULL
);
3202 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister
);
3205 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3206 * the special handling of PFMEMALLOC skbs.
3208 static bool skb_pfmemalloc_protocol(struct sk_buff
*skb
)
3210 switch (skb
->protocol
) {
3211 case __constant_htons(ETH_P_ARP
):
3212 case __constant_htons(ETH_P_IP
):
3213 case __constant_htons(ETH_P_IPV6
):
3214 case __constant_htons(ETH_P_8021Q
):
3221 static int __netif_receive_skb(struct sk_buff
*skb
)
3223 struct packet_type
*ptype
, *pt_prev
;
3224 rx_handler_func_t
*rx_handler
;
3225 struct net_device
*orig_dev
;
3226 struct net_device
*null_or_dev
;
3227 bool deliver_exact
= false;
3228 int ret
= NET_RX_DROP
;
3230 unsigned long pflags
= current
->flags
;
3232 net_timestamp_check(!netdev_tstamp_prequeue
, skb
);
3234 trace_netif_receive_skb(skb
);
3237 * PFMEMALLOC skbs are special, they should
3238 * - be delivered to SOCK_MEMALLOC sockets only
3239 * - stay away from userspace
3240 * - have bounded memory usage
3242 * Use PF_MEMALLOC as this saves us from propagating the allocation
3243 * context down to all allocation sites.
3245 if (sk_memalloc_socks() && skb_pfmemalloc(skb
))
3246 current
->flags
|= PF_MEMALLOC
;
3248 /* if we've gotten here through NAPI, check netpoll */
3249 if (netpoll_receive_skb(skb
))
3252 orig_dev
= skb
->dev
;
3254 skb_reset_network_header(skb
);
3255 skb_reset_transport_header(skb
);
3256 skb_reset_mac_len(skb
);
3263 skb
->skb_iif
= skb
->dev
->ifindex
;
3265 __this_cpu_inc(softnet_data
.processed
);
3267 if (skb
->protocol
== cpu_to_be16(ETH_P_8021Q
)) {
3268 skb
= vlan_untag(skb
);
3273 #ifdef CONFIG_NET_CLS_ACT
3274 if (skb
->tc_verd
& TC_NCLS
) {
3275 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
3280 if (sk_memalloc_socks() && skb_pfmemalloc(skb
))
3283 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
3284 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
) {
3286 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3292 #ifdef CONFIG_NET_CLS_ACT
3293 skb
= handle_ing(skb
, &pt_prev
, &ret
, orig_dev
);
3299 if (sk_memalloc_socks() && skb_pfmemalloc(skb
)
3300 && !skb_pfmemalloc_protocol(skb
))
3303 rx_handler
= rcu_dereference(skb
->dev
->rx_handler
);
3304 if (vlan_tx_tag_present(skb
)) {
3306 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3309 if (vlan_do_receive(&skb
, !rx_handler
))
3311 else if (unlikely(!skb
))
3317 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3320 switch (rx_handler(&skb
)) {
3321 case RX_HANDLER_CONSUMED
:
3323 case RX_HANDLER_ANOTHER
:
3325 case RX_HANDLER_EXACT
:
3326 deliver_exact
= true;
3327 case RX_HANDLER_PASS
:
3334 /* deliver only exact match when indicated */
3335 null_or_dev
= deliver_exact
? skb
->dev
: NULL
;
3337 type
= skb
->protocol
;
3338 list_for_each_entry_rcu(ptype
,
3339 &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
], list
) {
3340 if (ptype
->type
== type
&&
3341 (ptype
->dev
== null_or_dev
|| ptype
->dev
== skb
->dev
||
3342 ptype
->dev
== orig_dev
)) {
3344 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
3350 if (unlikely(skb_orphan_frags(skb
, GFP_ATOMIC
)))
3353 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
3356 atomic_long_inc(&skb
->dev
->rx_dropped
);
3358 /* Jamal, now you will not able to escape explaining
3359 * me how you were going to use this. :-)
3367 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
3372 * netif_receive_skb - process receive buffer from network
3373 * @skb: buffer to process
3375 * netif_receive_skb() is the main receive data processing function.
3376 * It always succeeds. The buffer may be dropped during processing
3377 * for congestion control or by the protocol layers.
3379 * This function may only be called from softirq context and interrupts
3380 * should be enabled.
3382 * Return values (usually ignored):
3383 * NET_RX_SUCCESS: no congestion
3384 * NET_RX_DROP: packet was dropped
3386 int netif_receive_skb(struct sk_buff
*skb
)
3388 net_timestamp_check(netdev_tstamp_prequeue
, skb
);
3390 if (skb_defer_rx_timestamp(skb
))
3391 return NET_RX_SUCCESS
;
3394 if (static_key_false(&rps_needed
)) {
3395 struct rps_dev_flow voidflow
, *rflow
= &voidflow
;
3400 cpu
= get_rps_cpu(skb
->dev
, skb
, &rflow
);
3403 ret
= enqueue_to_backlog(skb
, cpu
, &rflow
->last_qtail
);
3410 return __netif_receive_skb(skb
);
3412 EXPORT_SYMBOL(netif_receive_skb
);
3414 /* Network device is going away, flush any packets still pending
3415 * Called with irqs disabled.
3417 static void flush_backlog(void *arg
)
3419 struct net_device
*dev
= arg
;
3420 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3421 struct sk_buff
*skb
, *tmp
;
3424 skb_queue_walk_safe(&sd
->input_pkt_queue
, skb
, tmp
) {
3425 if (skb
->dev
== dev
) {
3426 __skb_unlink(skb
, &sd
->input_pkt_queue
);
3428 input_queue_head_incr(sd
);
3433 skb_queue_walk_safe(&sd
->process_queue
, skb
, tmp
) {
3434 if (skb
->dev
== dev
) {
3435 __skb_unlink(skb
, &sd
->process_queue
);
3437 input_queue_head_incr(sd
);
3442 static int napi_gro_complete(struct sk_buff
*skb
)
3444 struct packet_type
*ptype
;
3445 __be16 type
= skb
->protocol
;
3446 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
3449 if (NAPI_GRO_CB(skb
)->count
== 1) {
3450 skb_shinfo(skb
)->gso_size
= 0;
3455 list_for_each_entry_rcu(ptype
, head
, list
) {
3456 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_complete
)
3459 err
= ptype
->gro_complete(skb
);
3465 WARN_ON(&ptype
->list
== head
);
3467 return NET_RX_SUCCESS
;
3471 return netif_receive_skb(skb
);
3474 /* napi->gro_list contains packets ordered by age.
3475 * youngest packets at the head of it.
3476 * Complete skbs in reverse order to reduce latencies.
3478 void napi_gro_flush(struct napi_struct
*napi
, bool flush_old
)
3480 struct sk_buff
*skb
, *prev
= NULL
;
3482 /* scan list and build reverse chain */
3483 for (skb
= napi
->gro_list
; skb
!= NULL
; skb
= skb
->next
) {
3488 for (skb
= prev
; skb
; skb
= prev
) {
3491 if (flush_old
&& NAPI_GRO_CB(skb
)->age
== jiffies
)
3495 napi_gro_complete(skb
);
3499 napi
->gro_list
= NULL
;
3501 EXPORT_SYMBOL(napi_gro_flush
);
3503 enum gro_result
dev_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3505 struct sk_buff
**pp
= NULL
;
3506 struct packet_type
*ptype
;
3507 __be16 type
= skb
->protocol
;
3508 struct list_head
*head
= &ptype_base
[ntohs(type
) & PTYPE_HASH_MASK
];
3511 enum gro_result ret
;
3513 if (!(skb
->dev
->features
& NETIF_F_GRO
) || netpoll_rx_on(skb
))
3516 if (skb_is_gso(skb
) || skb_has_frag_list(skb
))
3520 list_for_each_entry_rcu(ptype
, head
, list
) {
3521 if (ptype
->type
!= type
|| ptype
->dev
|| !ptype
->gro_receive
)
3524 skb_set_network_header(skb
, skb_gro_offset(skb
));
3525 mac_len
= skb
->network_header
- skb
->mac_header
;
3526 skb
->mac_len
= mac_len
;
3527 NAPI_GRO_CB(skb
)->same_flow
= 0;
3528 NAPI_GRO_CB(skb
)->flush
= 0;
3529 NAPI_GRO_CB(skb
)->free
= 0;
3531 pp
= ptype
->gro_receive(&napi
->gro_list
, skb
);
3536 if (&ptype
->list
== head
)
3539 same_flow
= NAPI_GRO_CB(skb
)->same_flow
;
3540 ret
= NAPI_GRO_CB(skb
)->free
? GRO_MERGED_FREE
: GRO_MERGED
;
3543 struct sk_buff
*nskb
= *pp
;
3547 napi_gro_complete(nskb
);
3554 if (NAPI_GRO_CB(skb
)->flush
|| napi
->gro_count
>= MAX_GRO_SKBS
)
3558 NAPI_GRO_CB(skb
)->count
= 1;
3559 NAPI_GRO_CB(skb
)->age
= jiffies
;
3560 skb_shinfo(skb
)->gso_size
= skb_gro_len(skb
);
3561 skb
->next
= napi
->gro_list
;
3562 napi
->gro_list
= skb
;
3566 if (skb_headlen(skb
) < skb_gro_offset(skb
)) {
3567 int grow
= skb_gro_offset(skb
) - skb_headlen(skb
);
3569 BUG_ON(skb
->end
- skb
->tail
< grow
);
3571 memcpy(skb_tail_pointer(skb
), NAPI_GRO_CB(skb
)->frag0
, grow
);
3574 skb
->data_len
-= grow
;
3576 skb_shinfo(skb
)->frags
[0].page_offset
+= grow
;
3577 skb_frag_size_sub(&skb_shinfo(skb
)->frags
[0], grow
);
3579 if (unlikely(!skb_frag_size(&skb_shinfo(skb
)->frags
[0]))) {
3580 skb_frag_unref(skb
, 0);
3581 memmove(skb_shinfo(skb
)->frags
,
3582 skb_shinfo(skb
)->frags
+ 1,
3583 --skb_shinfo(skb
)->nr_frags
* sizeof(skb_frag_t
));
3594 EXPORT_SYMBOL(dev_gro_receive
);
3596 static inline gro_result_t
3597 __napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3600 unsigned int maclen
= skb
->dev
->hard_header_len
;
3602 for (p
= napi
->gro_list
; p
; p
= p
->next
) {
3603 unsigned long diffs
;
3605 diffs
= (unsigned long)p
->dev
^ (unsigned long)skb
->dev
;
3606 diffs
|= p
->vlan_tci
^ skb
->vlan_tci
;
3607 if (maclen
== ETH_HLEN
)
3608 diffs
|= compare_ether_header(skb_mac_header(p
),
3609 skb_gro_mac_header(skb
));
3611 diffs
= memcmp(skb_mac_header(p
),
3612 skb_gro_mac_header(skb
),
3614 NAPI_GRO_CB(p
)->same_flow
= !diffs
;
3615 NAPI_GRO_CB(p
)->flush
= 0;
3618 return dev_gro_receive(napi
, skb
);
3621 gro_result_t
napi_skb_finish(gro_result_t ret
, struct sk_buff
*skb
)
3625 if (netif_receive_skb(skb
))
3633 case GRO_MERGED_FREE
:
3634 if (NAPI_GRO_CB(skb
)->free
== NAPI_GRO_FREE_STOLEN_HEAD
)
3635 kmem_cache_free(skbuff_head_cache
, skb
);
3647 EXPORT_SYMBOL(napi_skb_finish
);
3649 static void skb_gro_reset_offset(struct sk_buff
*skb
)
3651 const struct skb_shared_info
*pinfo
= skb_shinfo(skb
);
3652 const skb_frag_t
*frag0
= &pinfo
->frags
[0];
3654 NAPI_GRO_CB(skb
)->data_offset
= 0;
3655 NAPI_GRO_CB(skb
)->frag0
= NULL
;
3656 NAPI_GRO_CB(skb
)->frag0_len
= 0;
3658 if (skb
->mac_header
== skb
->tail
&&
3660 !PageHighMem(skb_frag_page(frag0
))) {
3661 NAPI_GRO_CB(skb
)->frag0
= skb_frag_address(frag0
);
3662 NAPI_GRO_CB(skb
)->frag0_len
= skb_frag_size(frag0
);
3666 gro_result_t
napi_gro_receive(struct napi_struct
*napi
, struct sk_buff
*skb
)
3668 skb_gro_reset_offset(skb
);
3670 return napi_skb_finish(__napi_gro_receive(napi
, skb
), skb
);
3672 EXPORT_SYMBOL(napi_gro_receive
);
3674 static void napi_reuse_skb(struct napi_struct
*napi
, struct sk_buff
*skb
)
3676 __skb_pull(skb
, skb_headlen(skb
));
3677 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3678 skb_reserve(skb
, NET_SKB_PAD
+ NET_IP_ALIGN
- skb_headroom(skb
));
3680 skb
->dev
= napi
->dev
;
3686 struct sk_buff
*napi_get_frags(struct napi_struct
*napi
)
3688 struct sk_buff
*skb
= napi
->skb
;
3691 skb
= netdev_alloc_skb_ip_align(napi
->dev
, GRO_MAX_HEAD
);
3697 EXPORT_SYMBOL(napi_get_frags
);
3699 gro_result_t
napi_frags_finish(struct napi_struct
*napi
, struct sk_buff
*skb
,
3705 skb
->protocol
= eth_type_trans(skb
, skb
->dev
);
3707 if (ret
== GRO_HELD
)
3708 skb_gro_pull(skb
, -ETH_HLEN
);
3709 else if (netif_receive_skb(skb
))
3714 case GRO_MERGED_FREE
:
3715 napi_reuse_skb(napi
, skb
);
3724 EXPORT_SYMBOL(napi_frags_finish
);
3726 static struct sk_buff
*napi_frags_skb(struct napi_struct
*napi
)
3728 struct sk_buff
*skb
= napi
->skb
;
3735 skb_reset_mac_header(skb
);
3736 skb_gro_reset_offset(skb
);
3738 off
= skb_gro_offset(skb
);
3739 hlen
= off
+ sizeof(*eth
);
3740 eth
= skb_gro_header_fast(skb
, off
);
3741 if (skb_gro_header_hard(skb
, hlen
)) {
3742 eth
= skb_gro_header_slow(skb
, hlen
, off
);
3743 if (unlikely(!eth
)) {
3744 napi_reuse_skb(napi
, skb
);
3750 skb_gro_pull(skb
, sizeof(*eth
));
3753 * This works because the only protocols we care about don't require
3754 * special handling. We'll fix it up properly at the end.
3756 skb
->protocol
= eth
->h_proto
;
3762 gro_result_t
napi_gro_frags(struct napi_struct
*napi
)
3764 struct sk_buff
*skb
= napi_frags_skb(napi
);
3769 return napi_frags_finish(napi
, skb
, __napi_gro_receive(napi
, skb
));
3771 EXPORT_SYMBOL(napi_gro_frags
);
3774 * net_rps_action sends any pending IPI's for rps.
3775 * Note: called with local irq disabled, but exits with local irq enabled.
3777 static void net_rps_action_and_irq_enable(struct softnet_data
*sd
)
3780 struct softnet_data
*remsd
= sd
->rps_ipi_list
;
3783 sd
->rps_ipi_list
= NULL
;
3787 /* Send pending IPI's to kick RPS processing on remote cpus. */
3789 struct softnet_data
*next
= remsd
->rps_ipi_next
;
3791 if (cpu_online(remsd
->cpu
))
3792 __smp_call_function_single(remsd
->cpu
,
3801 static int process_backlog(struct napi_struct
*napi
, int quota
)
3804 struct softnet_data
*sd
= container_of(napi
, struct softnet_data
, backlog
);
3807 /* Check if we have pending ipi, its better to send them now,
3808 * not waiting net_rx_action() end.
3810 if (sd
->rps_ipi_list
) {
3811 local_irq_disable();
3812 net_rps_action_and_irq_enable(sd
);
3815 napi
->weight
= weight_p
;
3816 local_irq_disable();
3817 while (work
< quota
) {
3818 struct sk_buff
*skb
;
3821 while ((skb
= __skb_dequeue(&sd
->process_queue
))) {
3823 __netif_receive_skb(skb
);
3824 local_irq_disable();
3825 input_queue_head_incr(sd
);
3826 if (++work
>= quota
) {
3833 qlen
= skb_queue_len(&sd
->input_pkt_queue
);
3835 skb_queue_splice_tail_init(&sd
->input_pkt_queue
,
3836 &sd
->process_queue
);
3838 if (qlen
< quota
- work
) {
3840 * Inline a custom version of __napi_complete().
3841 * only current cpu owns and manipulates this napi,
3842 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3843 * we can use a plain write instead of clear_bit(),
3844 * and we dont need an smp_mb() memory barrier.
3846 list_del(&napi
->poll_list
);
3849 quota
= work
+ qlen
;
3859 * __napi_schedule - schedule for receive
3860 * @n: entry to schedule
3862 * The entry's receive function will be scheduled to run
3864 void __napi_schedule(struct napi_struct
*n
)
3866 unsigned long flags
;
3868 local_irq_save(flags
);
3869 ____napi_schedule(&__get_cpu_var(softnet_data
), n
);
3870 local_irq_restore(flags
);
3872 EXPORT_SYMBOL(__napi_schedule
);
3874 void __napi_complete(struct napi_struct
*n
)
3876 BUG_ON(!test_bit(NAPI_STATE_SCHED
, &n
->state
));
3877 BUG_ON(n
->gro_list
);
3879 list_del(&n
->poll_list
);
3880 smp_mb__before_clear_bit();
3881 clear_bit(NAPI_STATE_SCHED
, &n
->state
);
3883 EXPORT_SYMBOL(__napi_complete
);
3885 void napi_complete(struct napi_struct
*n
)
3887 unsigned long flags
;
3890 * don't let napi dequeue from the cpu poll list
3891 * just in case its running on a different cpu
3893 if (unlikely(test_bit(NAPI_STATE_NPSVC
, &n
->state
)))
3896 napi_gro_flush(n
, false);
3897 local_irq_save(flags
);
3899 local_irq_restore(flags
);
3901 EXPORT_SYMBOL(napi_complete
);
3903 void netif_napi_add(struct net_device
*dev
, struct napi_struct
*napi
,
3904 int (*poll
)(struct napi_struct
*, int), int weight
)
3906 INIT_LIST_HEAD(&napi
->poll_list
);
3907 napi
->gro_count
= 0;
3908 napi
->gro_list
= NULL
;
3911 napi
->weight
= weight
;
3912 list_add(&napi
->dev_list
, &dev
->napi_list
);
3914 #ifdef CONFIG_NETPOLL
3915 spin_lock_init(&napi
->poll_lock
);
3916 napi
->poll_owner
= -1;
3918 set_bit(NAPI_STATE_SCHED
, &napi
->state
);
3920 EXPORT_SYMBOL(netif_napi_add
);
3922 void netif_napi_del(struct napi_struct
*napi
)
3924 struct sk_buff
*skb
, *next
;
3926 list_del_init(&napi
->dev_list
);
3927 napi_free_frags(napi
);
3929 for (skb
= napi
->gro_list
; skb
; skb
= next
) {
3935 napi
->gro_list
= NULL
;
3936 napi
->gro_count
= 0;
3938 EXPORT_SYMBOL(netif_napi_del
);
3940 static void net_rx_action(struct softirq_action
*h
)
3942 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
3943 unsigned long time_limit
= jiffies
+ 2;
3944 int budget
= netdev_budget
;
3947 local_irq_disable();
3949 while (!list_empty(&sd
->poll_list
)) {
3950 struct napi_struct
*n
;
3953 /* If softirq window is exhuasted then punt.
3954 * Allow this to run for 2 jiffies since which will allow
3955 * an average latency of 1.5/HZ.
3957 if (unlikely(budget
<= 0 || time_after(jiffies
, time_limit
)))
3962 /* Even though interrupts have been re-enabled, this
3963 * access is safe because interrupts can only add new
3964 * entries to the tail of this list, and only ->poll()
3965 * calls can remove this head entry from the list.
3967 n
= list_first_entry(&sd
->poll_list
, struct napi_struct
, poll_list
);
3969 have
= netpoll_poll_lock(n
);
3973 /* This NAPI_STATE_SCHED test is for avoiding a race
3974 * with netpoll's poll_napi(). Only the entity which
3975 * obtains the lock and sees NAPI_STATE_SCHED set will
3976 * actually make the ->poll() call. Therefore we avoid
3977 * accidentally calling ->poll() when NAPI is not scheduled.
3980 if (test_bit(NAPI_STATE_SCHED
, &n
->state
)) {
3981 work
= n
->poll(n
, weight
);
3985 WARN_ON_ONCE(work
> weight
);
3989 local_irq_disable();
3991 /* Drivers must not modify the NAPI state if they
3992 * consume the entire weight. In such cases this code
3993 * still "owns" the NAPI instance and therefore can
3994 * move the instance around on the list at-will.
3996 if (unlikely(work
== weight
)) {
3997 if (unlikely(napi_disable_pending(n
))) {
4000 local_irq_disable();
4003 /* flush too old packets
4004 * If HZ < 1000, flush all packets.
4007 napi_gro_flush(n
, HZ
>= 1000);
4008 local_irq_disable();
4010 list_move_tail(&n
->poll_list
, &sd
->poll_list
);
4014 netpoll_poll_unlock(have
);
4017 net_rps_action_and_irq_enable(sd
);
4019 #ifdef CONFIG_NET_DMA
4021 * There may not be any more sk_buffs coming right now, so push
4022 * any pending DMA copies to hardware
4024 dma_issue_pending_all();
4031 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
4035 static gifconf_func_t
*gifconf_list
[NPROTO
];
4038 * register_gifconf - register a SIOCGIF handler
4039 * @family: Address family
4040 * @gifconf: Function handler
4042 * Register protocol dependent address dumping routines. The handler
4043 * that is passed must not be freed or reused until it has been replaced
4044 * by another handler.
4046 int register_gifconf(unsigned int family
, gifconf_func_t
*gifconf
)
4048 if (family
>= NPROTO
)
4050 gifconf_list
[family
] = gifconf
;
4053 EXPORT_SYMBOL(register_gifconf
);
4057 * Map an interface index to its name (SIOCGIFNAME)
4061 * We need this ioctl for efficient implementation of the
4062 * if_indextoname() function required by the IPv6 API. Without
4063 * it, we would have to search all the interfaces to find a
4067 static int dev_ifname(struct net
*net
, struct ifreq __user
*arg
)
4069 struct net_device
*dev
;
4073 * Fetch the caller's info block.
4076 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
4080 dev
= dev_get_by_index_rcu(net
, ifr
.ifr_ifindex
);
4086 strcpy(ifr
.ifr_name
, dev
->name
);
4089 if (copy_to_user(arg
, &ifr
, sizeof(struct ifreq
)))
4095 * Perform a SIOCGIFCONF call. This structure will change
4096 * size eventually, and there is nothing I can do about it.
4097 * Thus we will need a 'compatibility mode'.
4100 static int dev_ifconf(struct net
*net
, char __user
*arg
)
4103 struct net_device
*dev
;
4110 * Fetch the caller's info block.
4113 if (copy_from_user(&ifc
, arg
, sizeof(struct ifconf
)))
4120 * Loop over the interfaces, and write an info block for each.
4124 for_each_netdev(net
, dev
) {
4125 for (i
= 0; i
< NPROTO
; i
++) {
4126 if (gifconf_list
[i
]) {
4129 done
= gifconf_list
[i
](dev
, NULL
, 0);
4131 done
= gifconf_list
[i
](dev
, pos
+ total
,
4141 * All done. Write the updated control block back to the caller.
4143 ifc
.ifc_len
= total
;
4146 * Both BSD and Solaris return 0 here, so we do too.
4148 return copy_to_user(arg
, &ifc
, sizeof(struct ifconf
)) ? -EFAULT
: 0;
4151 #ifdef CONFIG_PROC_FS
4153 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4155 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4156 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4157 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4159 static inline struct net_device
*dev_from_same_bucket(struct seq_file
*seq
, loff_t
*pos
)
4161 struct net
*net
= seq_file_net(seq
);
4162 struct net_device
*dev
;
4163 struct hlist_node
*p
;
4164 struct hlist_head
*h
;
4165 unsigned int count
= 0, offset
= get_offset(*pos
);
4167 h
= &net
->dev_name_head
[get_bucket(*pos
)];
4168 hlist_for_each_entry_rcu(dev
, p
, h
, name_hlist
) {
4169 if (++count
== offset
)
4176 static inline struct net_device
*dev_from_bucket(struct seq_file
*seq
, loff_t
*pos
)
4178 struct net_device
*dev
;
4179 unsigned int bucket
;
4182 dev
= dev_from_same_bucket(seq
, pos
);
4186 bucket
= get_bucket(*pos
) + 1;
4187 *pos
= set_bucket_offset(bucket
, 1);
4188 } while (bucket
< NETDEV_HASHENTRIES
);
4194 * This is invoked by the /proc filesystem handler to display a device
4197 void *dev_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4202 return SEQ_START_TOKEN
;
4204 if (get_bucket(*pos
) >= NETDEV_HASHENTRIES
)
4207 return dev_from_bucket(seq
, pos
);
4210 void *dev_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4213 return dev_from_bucket(seq
, pos
);
4216 void dev_seq_stop(struct seq_file
*seq
, void *v
)
4222 static void dev_seq_printf_stats(struct seq_file
*seq
, struct net_device
*dev
)
4224 struct rtnl_link_stats64 temp
;
4225 const struct rtnl_link_stats64
*stats
= dev_get_stats(dev
, &temp
);
4227 seq_printf(seq
, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4228 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4229 dev
->name
, stats
->rx_bytes
, stats
->rx_packets
,
4231 stats
->rx_dropped
+ stats
->rx_missed_errors
,
4232 stats
->rx_fifo_errors
,
4233 stats
->rx_length_errors
+ stats
->rx_over_errors
+
4234 stats
->rx_crc_errors
+ stats
->rx_frame_errors
,
4235 stats
->rx_compressed
, stats
->multicast
,
4236 stats
->tx_bytes
, stats
->tx_packets
,
4237 stats
->tx_errors
, stats
->tx_dropped
,
4238 stats
->tx_fifo_errors
, stats
->collisions
,
4239 stats
->tx_carrier_errors
+
4240 stats
->tx_aborted_errors
+
4241 stats
->tx_window_errors
+
4242 stats
->tx_heartbeat_errors
,
4243 stats
->tx_compressed
);
4247 * Called from the PROCfs module. This now uses the new arbitrary sized
4248 * /proc/net interface to create /proc/net/dev
4250 static int dev_seq_show(struct seq_file
*seq
, void *v
)
4252 if (v
== SEQ_START_TOKEN
)
4253 seq_puts(seq
, "Inter-| Receive "
4255 " face |bytes packets errs drop fifo frame "
4256 "compressed multicast|bytes packets errs "
4257 "drop fifo colls carrier compressed\n");
4259 dev_seq_printf_stats(seq
, v
);
4263 static struct softnet_data
*softnet_get_online(loff_t
*pos
)
4265 struct softnet_data
*sd
= NULL
;
4267 while (*pos
< nr_cpu_ids
)
4268 if (cpu_online(*pos
)) {
4269 sd
= &per_cpu(softnet_data
, *pos
);
4276 static void *softnet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4278 return softnet_get_online(pos
);
4281 static void *softnet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4284 return softnet_get_online(pos
);
4287 static void softnet_seq_stop(struct seq_file
*seq
, void *v
)
4291 static int softnet_seq_show(struct seq_file
*seq
, void *v
)
4293 struct softnet_data
*sd
= v
;
4295 seq_printf(seq
, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4296 sd
->processed
, sd
->dropped
, sd
->time_squeeze
, 0,
4297 0, 0, 0, 0, /* was fastroute */
4298 sd
->cpu_collision
, sd
->received_rps
);
4302 static const struct seq_operations dev_seq_ops
= {
4303 .start
= dev_seq_start
,
4304 .next
= dev_seq_next
,
4305 .stop
= dev_seq_stop
,
4306 .show
= dev_seq_show
,
4309 static int dev_seq_open(struct inode
*inode
, struct file
*file
)
4311 return seq_open_net(inode
, file
, &dev_seq_ops
,
4312 sizeof(struct seq_net_private
));
4315 static const struct file_operations dev_seq_fops
= {
4316 .owner
= THIS_MODULE
,
4317 .open
= dev_seq_open
,
4319 .llseek
= seq_lseek
,
4320 .release
= seq_release_net
,
4323 static const struct seq_operations softnet_seq_ops
= {
4324 .start
= softnet_seq_start
,
4325 .next
= softnet_seq_next
,
4326 .stop
= softnet_seq_stop
,
4327 .show
= softnet_seq_show
,
4330 static int softnet_seq_open(struct inode
*inode
, struct file
*file
)
4332 return seq_open(file
, &softnet_seq_ops
);
4335 static const struct file_operations softnet_seq_fops
= {
4336 .owner
= THIS_MODULE
,
4337 .open
= softnet_seq_open
,
4339 .llseek
= seq_lseek
,
4340 .release
= seq_release
,
4343 static void *ptype_get_idx(loff_t pos
)
4345 struct packet_type
*pt
= NULL
;
4349 list_for_each_entry_rcu(pt
, &ptype_all
, list
) {
4355 for (t
= 0; t
< PTYPE_HASH_SIZE
; t
++) {
4356 list_for_each_entry_rcu(pt
, &ptype_base
[t
], list
) {
4365 static void *ptype_seq_start(struct seq_file
*seq
, loff_t
*pos
)
4369 return *pos
? ptype_get_idx(*pos
- 1) : SEQ_START_TOKEN
;
4372 static void *ptype_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
4374 struct packet_type
*pt
;
4375 struct list_head
*nxt
;
4379 if (v
== SEQ_START_TOKEN
)
4380 return ptype_get_idx(0);
4383 nxt
= pt
->list
.next
;
4384 if (pt
->type
== htons(ETH_P_ALL
)) {
4385 if (nxt
!= &ptype_all
)
4388 nxt
= ptype_base
[0].next
;
4390 hash
= ntohs(pt
->type
) & PTYPE_HASH_MASK
;
4392 while (nxt
== &ptype_base
[hash
]) {
4393 if (++hash
>= PTYPE_HASH_SIZE
)
4395 nxt
= ptype_base
[hash
].next
;
4398 return list_entry(nxt
, struct packet_type
, list
);
4401 static void ptype_seq_stop(struct seq_file
*seq
, void *v
)
4407 static int ptype_seq_show(struct seq_file
*seq
, void *v
)
4409 struct packet_type
*pt
= v
;
4411 if (v
== SEQ_START_TOKEN
)
4412 seq_puts(seq
, "Type Device Function\n");
4413 else if (pt
->dev
== NULL
|| dev_net(pt
->dev
) == seq_file_net(seq
)) {
4414 if (pt
->type
== htons(ETH_P_ALL
))
4415 seq_puts(seq
, "ALL ");
4417 seq_printf(seq
, "%04x", ntohs(pt
->type
));
4419 seq_printf(seq
, " %-8s %pF\n",
4420 pt
->dev
? pt
->dev
->name
: "", pt
->func
);
4426 static const struct seq_operations ptype_seq_ops
= {
4427 .start
= ptype_seq_start
,
4428 .next
= ptype_seq_next
,
4429 .stop
= ptype_seq_stop
,
4430 .show
= ptype_seq_show
,
4433 static int ptype_seq_open(struct inode
*inode
, struct file
*file
)
4435 return seq_open_net(inode
, file
, &ptype_seq_ops
,
4436 sizeof(struct seq_net_private
));
4439 static const struct file_operations ptype_seq_fops
= {
4440 .owner
= THIS_MODULE
,
4441 .open
= ptype_seq_open
,
4443 .llseek
= seq_lseek
,
4444 .release
= seq_release_net
,
4448 static int __net_init
dev_proc_net_init(struct net
*net
)
4452 if (!proc_net_fops_create(net
, "dev", S_IRUGO
, &dev_seq_fops
))
4454 if (!proc_net_fops_create(net
, "softnet_stat", S_IRUGO
, &softnet_seq_fops
))
4456 if (!proc_net_fops_create(net
, "ptype", S_IRUGO
, &ptype_seq_fops
))
4459 if (wext_proc_init(net
))
4465 proc_net_remove(net
, "ptype");
4467 proc_net_remove(net
, "softnet_stat");
4469 proc_net_remove(net
, "dev");
4473 static void __net_exit
dev_proc_net_exit(struct net
*net
)
4475 wext_proc_exit(net
);
4477 proc_net_remove(net
, "ptype");
4478 proc_net_remove(net
, "softnet_stat");
4479 proc_net_remove(net
, "dev");
4482 static struct pernet_operations __net_initdata dev_proc_ops
= {
4483 .init
= dev_proc_net_init
,
4484 .exit
= dev_proc_net_exit
,
4487 static int __init
dev_proc_init(void)
4489 return register_pernet_subsys(&dev_proc_ops
);
4492 #define dev_proc_init() 0
4493 #endif /* CONFIG_PROC_FS */
4497 * netdev_set_master - set up master pointer
4498 * @slave: slave device
4499 * @master: new master device
4501 * Changes the master device of the slave. Pass %NULL to break the
4502 * bonding. The caller must hold the RTNL semaphore. On a failure
4503 * a negative errno code is returned. On success the reference counts
4504 * are adjusted and the function returns zero.
4506 int netdev_set_master(struct net_device
*slave
, struct net_device
*master
)
4508 struct net_device
*old
= slave
->master
;
4518 slave
->master
= master
;
4524 EXPORT_SYMBOL(netdev_set_master
);
4527 * netdev_set_bond_master - set up bonding master/slave pair
4528 * @slave: slave device
4529 * @master: new master device
4531 * Changes the master device of the slave. Pass %NULL to break the
4532 * bonding. The caller must hold the RTNL semaphore. On a failure
4533 * a negative errno code is returned. On success %RTM_NEWLINK is sent
4534 * to the routing socket and the function returns zero.
4536 int netdev_set_bond_master(struct net_device
*slave
, struct net_device
*master
)
4542 err
= netdev_set_master(slave
, master
);
4546 slave
->flags
|= IFF_SLAVE
;
4548 slave
->flags
&= ~IFF_SLAVE
;
4550 rtmsg_ifinfo(RTM_NEWLINK
, slave
, IFF_SLAVE
);
4553 EXPORT_SYMBOL(netdev_set_bond_master
);
4555 static void dev_change_rx_flags(struct net_device
*dev
, int flags
)
4557 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4559 if ((dev
->flags
& IFF_UP
) && ops
->ndo_change_rx_flags
)
4560 ops
->ndo_change_rx_flags(dev
, flags
);
4563 static int __dev_set_promiscuity(struct net_device
*dev
, int inc
)
4565 unsigned int old_flags
= dev
->flags
;
4571 dev
->flags
|= IFF_PROMISC
;
4572 dev
->promiscuity
+= inc
;
4573 if (dev
->promiscuity
== 0) {
4576 * If inc causes overflow, untouch promisc and return error.
4579 dev
->flags
&= ~IFF_PROMISC
;
4581 dev
->promiscuity
-= inc
;
4582 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
4587 if (dev
->flags
!= old_flags
) {
4588 pr_info("device %s %s promiscuous mode\n",
4590 dev
->flags
& IFF_PROMISC
? "entered" : "left");
4591 if (audit_enabled
) {
4592 current_uid_gid(&uid
, &gid
);
4593 audit_log(current
->audit_context
, GFP_ATOMIC
,
4594 AUDIT_ANOM_PROMISCUOUS
,
4595 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4596 dev
->name
, (dev
->flags
& IFF_PROMISC
),
4597 (old_flags
& IFF_PROMISC
),
4598 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
4599 from_kuid(&init_user_ns
, uid
),
4600 from_kgid(&init_user_ns
, gid
),
4601 audit_get_sessionid(current
));
4604 dev_change_rx_flags(dev
, IFF_PROMISC
);
4610 * dev_set_promiscuity - update promiscuity count on a device
4614 * Add or remove promiscuity from a device. While the count in the device
4615 * remains above zero the interface remains promiscuous. Once it hits zero
4616 * the device reverts back to normal filtering operation. A negative inc
4617 * value is used to drop promiscuity on the device.
4618 * Return 0 if successful or a negative errno code on error.
4620 int dev_set_promiscuity(struct net_device
*dev
, int inc
)
4622 unsigned int old_flags
= dev
->flags
;
4625 err
= __dev_set_promiscuity(dev
, inc
);
4628 if (dev
->flags
!= old_flags
)
4629 dev_set_rx_mode(dev
);
4632 EXPORT_SYMBOL(dev_set_promiscuity
);
4635 * dev_set_allmulti - update allmulti count on a device
4639 * Add or remove reception of all multicast frames to a device. While the
4640 * count in the device remains above zero the interface remains listening
4641 * to all interfaces. Once it hits zero the device reverts back to normal
4642 * filtering operation. A negative @inc value is used to drop the counter
4643 * when releasing a resource needing all multicasts.
4644 * Return 0 if successful or a negative errno code on error.
4647 int dev_set_allmulti(struct net_device
*dev
, int inc
)
4649 unsigned int old_flags
= dev
->flags
;
4653 dev
->flags
|= IFF_ALLMULTI
;
4654 dev
->allmulti
+= inc
;
4655 if (dev
->allmulti
== 0) {
4658 * If inc causes overflow, untouch allmulti and return error.
4661 dev
->flags
&= ~IFF_ALLMULTI
;
4663 dev
->allmulti
-= inc
;
4664 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
4669 if (dev
->flags
^ old_flags
) {
4670 dev_change_rx_flags(dev
, IFF_ALLMULTI
);
4671 dev_set_rx_mode(dev
);
4675 EXPORT_SYMBOL(dev_set_allmulti
);
4678 * Upload unicast and multicast address lists to device and
4679 * configure RX filtering. When the device doesn't support unicast
4680 * filtering it is put in promiscuous mode while unicast addresses
4683 void __dev_set_rx_mode(struct net_device
*dev
)
4685 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4687 /* dev_open will call this function so the list will stay sane. */
4688 if (!(dev
->flags
&IFF_UP
))
4691 if (!netif_device_present(dev
))
4694 if (!(dev
->priv_flags
& IFF_UNICAST_FLT
)) {
4695 /* Unicast addresses changes may only happen under the rtnl,
4696 * therefore calling __dev_set_promiscuity here is safe.
4698 if (!netdev_uc_empty(dev
) && !dev
->uc_promisc
) {
4699 __dev_set_promiscuity(dev
, 1);
4700 dev
->uc_promisc
= true;
4701 } else if (netdev_uc_empty(dev
) && dev
->uc_promisc
) {
4702 __dev_set_promiscuity(dev
, -1);
4703 dev
->uc_promisc
= false;
4707 if (ops
->ndo_set_rx_mode
)
4708 ops
->ndo_set_rx_mode(dev
);
4711 void dev_set_rx_mode(struct net_device
*dev
)
4713 netif_addr_lock_bh(dev
);
4714 __dev_set_rx_mode(dev
);
4715 netif_addr_unlock_bh(dev
);
4719 * dev_get_flags - get flags reported to userspace
4722 * Get the combination of flag bits exported through APIs to userspace.
4724 unsigned int dev_get_flags(const struct net_device
*dev
)
4728 flags
= (dev
->flags
& ~(IFF_PROMISC
|
4733 (dev
->gflags
& (IFF_PROMISC
|
4736 if (netif_running(dev
)) {
4737 if (netif_oper_up(dev
))
4738 flags
|= IFF_RUNNING
;
4739 if (netif_carrier_ok(dev
))
4740 flags
|= IFF_LOWER_UP
;
4741 if (netif_dormant(dev
))
4742 flags
|= IFF_DORMANT
;
4747 EXPORT_SYMBOL(dev_get_flags
);
4749 int __dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4751 unsigned int old_flags
= dev
->flags
;
4757 * Set the flags on our device.
4760 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
4761 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
4763 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
4767 * Load in the correct multicast list now the flags have changed.
4770 if ((old_flags
^ flags
) & IFF_MULTICAST
)
4771 dev_change_rx_flags(dev
, IFF_MULTICAST
);
4773 dev_set_rx_mode(dev
);
4776 * Have we downed the interface. We handle IFF_UP ourselves
4777 * according to user attempts to set it, rather than blindly
4782 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
4783 ret
= ((old_flags
& IFF_UP
) ? __dev_close
: __dev_open
)(dev
);
4786 dev_set_rx_mode(dev
);
4789 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
4790 int inc
= (flags
& IFF_PROMISC
) ? 1 : -1;
4792 dev
->gflags
^= IFF_PROMISC
;
4793 dev_set_promiscuity(dev
, inc
);
4796 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4797 is important. Some (broken) drivers set IFF_PROMISC, when
4798 IFF_ALLMULTI is requested not asking us and not reporting.
4800 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
4801 int inc
= (flags
& IFF_ALLMULTI
) ? 1 : -1;
4803 dev
->gflags
^= IFF_ALLMULTI
;
4804 dev_set_allmulti(dev
, inc
);
4810 void __dev_notify_flags(struct net_device
*dev
, unsigned int old_flags
)
4812 unsigned int changes
= dev
->flags
^ old_flags
;
4814 if (changes
& IFF_UP
) {
4815 if (dev
->flags
& IFF_UP
)
4816 call_netdevice_notifiers(NETDEV_UP
, dev
);
4818 call_netdevice_notifiers(NETDEV_DOWN
, dev
);
4821 if (dev
->flags
& IFF_UP
&&
4822 (changes
& ~(IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
| IFF_VOLATILE
)))
4823 call_netdevice_notifiers(NETDEV_CHANGE
, dev
);
4827 * dev_change_flags - change device settings
4829 * @flags: device state flags
4831 * Change settings on device based state flags. The flags are
4832 * in the userspace exported format.
4834 int dev_change_flags(struct net_device
*dev
, unsigned int flags
)
4837 unsigned int changes
, old_flags
= dev
->flags
;
4839 ret
= __dev_change_flags(dev
, flags
);
4843 changes
= old_flags
^ dev
->flags
;
4845 rtmsg_ifinfo(RTM_NEWLINK
, dev
, changes
);
4847 __dev_notify_flags(dev
, old_flags
);
4850 EXPORT_SYMBOL(dev_change_flags
);
4853 * dev_set_mtu - Change maximum transfer unit
4855 * @new_mtu: new transfer unit
4857 * Change the maximum transfer size of the network device.
4859 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
4861 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4864 if (new_mtu
== dev
->mtu
)
4867 /* MTU must be positive. */
4871 if (!netif_device_present(dev
))
4875 if (ops
->ndo_change_mtu
)
4876 err
= ops
->ndo_change_mtu(dev
, new_mtu
);
4880 if (!err
&& dev
->flags
& IFF_UP
)
4881 call_netdevice_notifiers(NETDEV_CHANGEMTU
, dev
);
4884 EXPORT_SYMBOL(dev_set_mtu
);
4887 * dev_set_group - Change group this device belongs to
4889 * @new_group: group this device should belong to
4891 void dev_set_group(struct net_device
*dev
, int new_group
)
4893 dev
->group
= new_group
;
4895 EXPORT_SYMBOL(dev_set_group
);
4898 * dev_set_mac_address - Change Media Access Control Address
4902 * Change the hardware (MAC) address of the device
4904 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
4906 const struct net_device_ops
*ops
= dev
->netdev_ops
;
4909 if (!ops
->ndo_set_mac_address
)
4911 if (sa
->sa_family
!= dev
->type
)
4913 if (!netif_device_present(dev
))
4915 err
= ops
->ndo_set_mac_address(dev
, sa
);
4917 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
4918 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
4921 EXPORT_SYMBOL(dev_set_mac_address
);
4924 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
4926 static int dev_ifsioc_locked(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4929 struct net_device
*dev
= dev_get_by_name_rcu(net
, ifr
->ifr_name
);
4935 case SIOCGIFFLAGS
: /* Get interface flags */
4936 ifr
->ifr_flags
= (short) dev_get_flags(dev
);
4939 case SIOCGIFMETRIC
: /* Get the metric on the interface
4940 (currently unused) */
4941 ifr
->ifr_metric
= 0;
4944 case SIOCGIFMTU
: /* Get the MTU of a device */
4945 ifr
->ifr_mtu
= dev
->mtu
;
4950 memset(ifr
->ifr_hwaddr
.sa_data
, 0, sizeof ifr
->ifr_hwaddr
.sa_data
);
4952 memcpy(ifr
->ifr_hwaddr
.sa_data
, dev
->dev_addr
,
4953 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
4954 ifr
->ifr_hwaddr
.sa_family
= dev
->type
;
4962 ifr
->ifr_map
.mem_start
= dev
->mem_start
;
4963 ifr
->ifr_map
.mem_end
= dev
->mem_end
;
4964 ifr
->ifr_map
.base_addr
= dev
->base_addr
;
4965 ifr
->ifr_map
.irq
= dev
->irq
;
4966 ifr
->ifr_map
.dma
= dev
->dma
;
4967 ifr
->ifr_map
.port
= dev
->if_port
;
4971 ifr
->ifr_ifindex
= dev
->ifindex
;
4975 ifr
->ifr_qlen
= dev
->tx_queue_len
;
4979 /* dev_ioctl() should ensure this case
4991 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4993 static int dev_ifsioc(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
)
4996 struct net_device
*dev
= __dev_get_by_name(net
, ifr
->ifr_name
);
4997 const struct net_device_ops
*ops
;
5002 ops
= dev
->netdev_ops
;
5005 case SIOCSIFFLAGS
: /* Set interface flags */
5006 return dev_change_flags(dev
, ifr
->ifr_flags
);
5008 case SIOCSIFMETRIC
: /* Set the metric on the interface
5009 (currently unused) */
5012 case SIOCSIFMTU
: /* Set the MTU of a device */
5013 return dev_set_mtu(dev
, ifr
->ifr_mtu
);
5016 return dev_set_mac_address(dev
, &ifr
->ifr_hwaddr
);
5018 case SIOCSIFHWBROADCAST
:
5019 if (ifr
->ifr_hwaddr
.sa_family
!= dev
->type
)
5021 memcpy(dev
->broadcast
, ifr
->ifr_hwaddr
.sa_data
,
5022 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
5023 call_netdevice_notifiers(NETDEV_CHANGEADDR
, dev
);
5027 if (ops
->ndo_set_config
) {
5028 if (!netif_device_present(dev
))
5030 return ops
->ndo_set_config(dev
, &ifr
->ifr_map
);
5035 if (!ops
->ndo_set_rx_mode
||
5036 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
5038 if (!netif_device_present(dev
))
5040 return dev_mc_add_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
5043 if (!ops
->ndo_set_rx_mode
||
5044 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
5046 if (!netif_device_present(dev
))
5048 return dev_mc_del_global(dev
, ifr
->ifr_hwaddr
.sa_data
);
5051 if (ifr
->ifr_qlen
< 0)
5053 dev
->tx_queue_len
= ifr
->ifr_qlen
;
5057 ifr
->ifr_newname
[IFNAMSIZ
-1] = '\0';
5058 return dev_change_name(dev
, ifr
->ifr_newname
);
5061 err
= net_hwtstamp_validate(ifr
);
5067 * Unknown or private ioctl
5070 if ((cmd
>= SIOCDEVPRIVATE
&&
5071 cmd
<= SIOCDEVPRIVATE
+ 15) ||
5072 cmd
== SIOCBONDENSLAVE
||
5073 cmd
== SIOCBONDRELEASE
||
5074 cmd
== SIOCBONDSETHWADDR
||
5075 cmd
== SIOCBONDSLAVEINFOQUERY
||
5076 cmd
== SIOCBONDINFOQUERY
||
5077 cmd
== SIOCBONDCHANGEACTIVE
||
5078 cmd
== SIOCGMIIPHY
||
5079 cmd
== SIOCGMIIREG
||
5080 cmd
== SIOCSMIIREG
||
5081 cmd
== SIOCBRADDIF
||
5082 cmd
== SIOCBRDELIF
||
5083 cmd
== SIOCSHWTSTAMP
||
5084 cmd
== SIOCWANDEV
) {
5086 if (ops
->ndo_do_ioctl
) {
5087 if (netif_device_present(dev
))
5088 err
= ops
->ndo_do_ioctl(dev
, ifr
, cmd
);
5100 * This function handles all "interface"-type I/O control requests. The actual
5101 * 'doing' part of this is dev_ifsioc above.
5105 * dev_ioctl - network device ioctl
5106 * @net: the applicable net namespace
5107 * @cmd: command to issue
5108 * @arg: pointer to a struct ifreq in user space
5110 * Issue ioctl functions to devices. This is normally called by the
5111 * user space syscall interfaces but can sometimes be useful for
5112 * other purposes. The return value is the return from the syscall if
5113 * positive or a negative errno code on error.
5116 int dev_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
5122 /* One special case: SIOCGIFCONF takes ifconf argument
5123 and requires shared lock, because it sleeps writing
5127 if (cmd
== SIOCGIFCONF
) {
5129 ret
= dev_ifconf(net
, (char __user
*) arg
);
5133 if (cmd
== SIOCGIFNAME
)
5134 return dev_ifname(net
, (struct ifreq __user
*)arg
);
5136 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
5139 ifr
.ifr_name
[IFNAMSIZ
-1] = 0;
5141 colon
= strchr(ifr
.ifr_name
, ':');
5146 * See which interface the caller is talking about.
5151 * These ioctl calls:
5152 * - can be done by all.
5153 * - atomic and do not require locking.
5164 dev_load(net
, ifr
.ifr_name
);
5166 ret
= dev_ifsioc_locked(net
, &ifr
, cmd
);
5171 if (copy_to_user(arg
, &ifr
,
5172 sizeof(struct ifreq
)))
5178 dev_load(net
, ifr
.ifr_name
);
5180 ret
= dev_ethtool(net
, &ifr
);
5185 if (copy_to_user(arg
, &ifr
,
5186 sizeof(struct ifreq
)))
5192 * These ioctl calls:
5193 * - require superuser power.
5194 * - require strict serialization.
5200 if (!capable(CAP_NET_ADMIN
))
5202 dev_load(net
, ifr
.ifr_name
);
5204 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5209 if (copy_to_user(arg
, &ifr
,
5210 sizeof(struct ifreq
)))
5216 * These ioctl calls:
5217 * - require superuser power.
5218 * - require strict serialization.
5219 * - do not return a value
5229 case SIOCSIFHWBROADCAST
:
5232 case SIOCBONDENSLAVE
:
5233 case SIOCBONDRELEASE
:
5234 case SIOCBONDSETHWADDR
:
5235 case SIOCBONDCHANGEACTIVE
:
5239 if (!capable(CAP_NET_ADMIN
))
5242 case SIOCBONDSLAVEINFOQUERY
:
5243 case SIOCBONDINFOQUERY
:
5244 dev_load(net
, ifr
.ifr_name
);
5246 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5251 /* Get the per device memory space. We can add this but
5252 * currently do not support it */
5254 /* Set the per device memory buffer space.
5255 * Not applicable in our case */
5260 * Unknown or private ioctl.
5263 if (cmd
== SIOCWANDEV
||
5264 (cmd
>= SIOCDEVPRIVATE
&&
5265 cmd
<= SIOCDEVPRIVATE
+ 15)) {
5266 dev_load(net
, ifr
.ifr_name
);
5268 ret
= dev_ifsioc(net
, &ifr
, cmd
);
5270 if (!ret
&& copy_to_user(arg
, &ifr
,
5271 sizeof(struct ifreq
)))
5275 /* Take care of Wireless Extensions */
5276 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
)
5277 return wext_handle_ioctl(net
, &ifr
, cmd
, arg
);
5284 * dev_new_index - allocate an ifindex
5285 * @net: the applicable net namespace
5287 * Returns a suitable unique value for a new device interface
5288 * number. The caller must hold the rtnl semaphore or the
5289 * dev_base_lock to be sure it remains unique.
5291 static int dev_new_index(struct net
*net
)
5293 int ifindex
= net
->ifindex
;
5297 if (!__dev_get_by_index(net
, ifindex
))
5298 return net
->ifindex
= ifindex
;
5302 /* Delayed registration/unregisteration */
5303 static LIST_HEAD(net_todo_list
);
5305 static void net_set_todo(struct net_device
*dev
)
5307 list_add_tail(&dev
->todo_list
, &net_todo_list
);
5310 static void rollback_registered_many(struct list_head
*head
)
5312 struct net_device
*dev
, *tmp
;
5314 BUG_ON(dev_boot_phase
);
5317 list_for_each_entry_safe(dev
, tmp
, head
, unreg_list
) {
5318 /* Some devices call without registering
5319 * for initialization unwind. Remove those
5320 * devices and proceed with the remaining.
5322 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
5323 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5327 list_del(&dev
->unreg_list
);
5330 dev
->dismantle
= true;
5331 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
5334 /* If device is running, close it first. */
5335 dev_close_many(head
);
5337 list_for_each_entry(dev
, head
, unreg_list
) {
5338 /* And unlink it from device chain. */
5339 unlist_netdevice(dev
);
5341 dev
->reg_state
= NETREG_UNREGISTERING
;
5346 list_for_each_entry(dev
, head
, unreg_list
) {
5347 /* Shutdown queueing discipline. */
5351 /* Notify protocols, that we are about to destroy
5352 this device. They should clean all the things.
5354 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5356 if (!dev
->rtnl_link_ops
||
5357 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5358 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
5361 * Flush the unicast and multicast chains
5366 if (dev
->netdev_ops
->ndo_uninit
)
5367 dev
->netdev_ops
->ndo_uninit(dev
);
5369 /* Notifier chain MUST detach us from master device. */
5370 WARN_ON(dev
->master
);
5372 /* Remove entries from kobject tree */
5373 netdev_unregister_kobject(dev
);
5378 list_for_each_entry(dev
, head
, unreg_list
)
5382 static void rollback_registered(struct net_device
*dev
)
5386 list_add(&dev
->unreg_list
, &single
);
5387 rollback_registered_many(&single
);
5391 static netdev_features_t
netdev_fix_features(struct net_device
*dev
,
5392 netdev_features_t features
)
5394 /* Fix illegal checksum combinations */
5395 if ((features
& NETIF_F_HW_CSUM
) &&
5396 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5397 netdev_warn(dev
, "mixed HW and IP checksum settings.\n");
5398 features
&= ~(NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
);
5401 /* Fix illegal SG+CSUM combinations. */
5402 if ((features
& NETIF_F_SG
) &&
5403 !(features
& NETIF_F_ALL_CSUM
)) {
5405 "Dropping NETIF_F_SG since no checksum feature.\n");
5406 features
&= ~NETIF_F_SG
;
5409 /* TSO requires that SG is present as well. */
5410 if ((features
& NETIF_F_ALL_TSO
) && !(features
& NETIF_F_SG
)) {
5411 netdev_dbg(dev
, "Dropping TSO features since no SG feature.\n");
5412 features
&= ~NETIF_F_ALL_TSO
;
5415 /* TSO ECN requires that TSO is present as well. */
5416 if ((features
& NETIF_F_ALL_TSO
) == NETIF_F_TSO_ECN
)
5417 features
&= ~NETIF_F_TSO_ECN
;
5419 /* Software GSO depends on SG. */
5420 if ((features
& NETIF_F_GSO
) && !(features
& NETIF_F_SG
)) {
5421 netdev_dbg(dev
, "Dropping NETIF_F_GSO since no SG feature.\n");
5422 features
&= ~NETIF_F_GSO
;
5425 /* UFO needs SG and checksumming */
5426 if (features
& NETIF_F_UFO
) {
5427 /* maybe split UFO into V4 and V6? */
5428 if (!((features
& NETIF_F_GEN_CSUM
) ||
5429 (features
& (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))
5430 == (NETIF_F_IP_CSUM
|NETIF_F_IPV6_CSUM
))) {
5432 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5433 features
&= ~NETIF_F_UFO
;
5436 if (!(features
& NETIF_F_SG
)) {
5438 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5439 features
&= ~NETIF_F_UFO
;
5446 int __netdev_update_features(struct net_device
*dev
)
5448 netdev_features_t features
;
5453 features
= netdev_get_wanted_features(dev
);
5455 if (dev
->netdev_ops
->ndo_fix_features
)
5456 features
= dev
->netdev_ops
->ndo_fix_features(dev
, features
);
5458 /* driver might be less strict about feature dependencies */
5459 features
= netdev_fix_features(dev
, features
);
5461 if (dev
->features
== features
)
5464 netdev_dbg(dev
, "Features changed: %pNF -> %pNF\n",
5465 &dev
->features
, &features
);
5467 if (dev
->netdev_ops
->ndo_set_features
)
5468 err
= dev
->netdev_ops
->ndo_set_features(dev
, features
);
5470 if (unlikely(err
< 0)) {
5472 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5473 err
, &features
, &dev
->features
);
5478 dev
->features
= features
;
5484 * netdev_update_features - recalculate device features
5485 * @dev: the device to check
5487 * Recalculate dev->features set and send notifications if it
5488 * has changed. Should be called after driver or hardware dependent
5489 * conditions might have changed that influence the features.
5491 void netdev_update_features(struct net_device
*dev
)
5493 if (__netdev_update_features(dev
))
5494 netdev_features_change(dev
);
5496 EXPORT_SYMBOL(netdev_update_features
);
5499 * netdev_change_features - recalculate device features
5500 * @dev: the device to check
5502 * Recalculate dev->features set and send notifications even
5503 * if they have not changed. Should be called instead of
5504 * netdev_update_features() if also dev->vlan_features might
5505 * have changed to allow the changes to be propagated to stacked
5508 void netdev_change_features(struct net_device
*dev
)
5510 __netdev_update_features(dev
);
5511 netdev_features_change(dev
);
5513 EXPORT_SYMBOL(netdev_change_features
);
5516 * netif_stacked_transfer_operstate - transfer operstate
5517 * @rootdev: the root or lower level device to transfer state from
5518 * @dev: the device to transfer operstate to
5520 * Transfer operational state from root to device. This is normally
5521 * called when a stacking relationship exists between the root
5522 * device and the device(a leaf device).
5524 void netif_stacked_transfer_operstate(const struct net_device
*rootdev
,
5525 struct net_device
*dev
)
5527 if (rootdev
->operstate
== IF_OPER_DORMANT
)
5528 netif_dormant_on(dev
);
5530 netif_dormant_off(dev
);
5532 if (netif_carrier_ok(rootdev
)) {
5533 if (!netif_carrier_ok(dev
))
5534 netif_carrier_on(dev
);
5536 if (netif_carrier_ok(dev
))
5537 netif_carrier_off(dev
);
5540 EXPORT_SYMBOL(netif_stacked_transfer_operstate
);
5543 static int netif_alloc_rx_queues(struct net_device
*dev
)
5545 unsigned int i
, count
= dev
->num_rx_queues
;
5546 struct netdev_rx_queue
*rx
;
5550 rx
= kcalloc(count
, sizeof(struct netdev_rx_queue
), GFP_KERNEL
);
5552 pr_err("netdev: Unable to allocate %u rx queues\n", count
);
5557 for (i
= 0; i
< count
; i
++)
5563 static void netdev_init_one_queue(struct net_device
*dev
,
5564 struct netdev_queue
*queue
, void *_unused
)
5566 /* Initialize queue lock */
5567 spin_lock_init(&queue
->_xmit_lock
);
5568 netdev_set_xmit_lockdep_class(&queue
->_xmit_lock
, dev
->type
);
5569 queue
->xmit_lock_owner
= -1;
5570 netdev_queue_numa_node_write(queue
, NUMA_NO_NODE
);
5573 dql_init(&queue
->dql
, HZ
);
5577 static int netif_alloc_netdev_queues(struct net_device
*dev
)
5579 unsigned int count
= dev
->num_tx_queues
;
5580 struct netdev_queue
*tx
;
5584 tx
= kcalloc(count
, sizeof(struct netdev_queue
), GFP_KERNEL
);
5586 pr_err("netdev: Unable to allocate %u tx queues\n", count
);
5591 netdev_for_each_tx_queue(dev
, netdev_init_one_queue
, NULL
);
5592 spin_lock_init(&dev
->tx_global_lock
);
5598 * register_netdevice - register a network device
5599 * @dev: device to register
5601 * Take a completed network device structure and add it to the kernel
5602 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5603 * chain. 0 is returned on success. A negative errno code is returned
5604 * on a failure to set up the device, or if the name is a duplicate.
5606 * Callers must hold the rtnl semaphore. You may want
5607 * register_netdev() instead of this.
5610 * The locking appears insufficient to guarantee two parallel registers
5611 * will not get the same name.
5614 int register_netdevice(struct net_device
*dev
)
5617 struct net
*net
= dev_net(dev
);
5619 BUG_ON(dev_boot_phase
);
5624 /* When net_device's are persistent, this will be fatal. */
5625 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
5628 spin_lock_init(&dev
->addr_list_lock
);
5629 netdev_set_addr_lockdep_class(dev
);
5633 ret
= dev_get_valid_name(net
, dev
, dev
->name
);
5637 /* Init, if this function is available */
5638 if (dev
->netdev_ops
->ndo_init
) {
5639 ret
= dev
->netdev_ops
->ndo_init(dev
);
5649 dev
->ifindex
= dev_new_index(net
);
5650 else if (__dev_get_by_index(net
, dev
->ifindex
))
5653 if (dev
->iflink
== -1)
5654 dev
->iflink
= dev
->ifindex
;
5656 /* Transfer changeable features to wanted_features and enable
5657 * software offloads (GSO and GRO).
5659 dev
->hw_features
|= NETIF_F_SOFT_FEATURES
;
5660 dev
->features
|= NETIF_F_SOFT_FEATURES
;
5661 dev
->wanted_features
= dev
->features
& dev
->hw_features
;
5663 /* Turn on no cache copy if HW is doing checksum */
5664 if (!(dev
->flags
& IFF_LOOPBACK
)) {
5665 dev
->hw_features
|= NETIF_F_NOCACHE_COPY
;
5666 if (dev
->features
& NETIF_F_ALL_CSUM
) {
5667 dev
->wanted_features
|= NETIF_F_NOCACHE_COPY
;
5668 dev
->features
|= NETIF_F_NOCACHE_COPY
;
5672 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5674 dev
->vlan_features
|= NETIF_F_HIGHDMA
;
5676 ret
= call_netdevice_notifiers(NETDEV_POST_INIT
, dev
);
5677 ret
= notifier_to_errno(ret
);
5681 ret
= netdev_register_kobject(dev
);
5684 dev
->reg_state
= NETREG_REGISTERED
;
5686 __netdev_update_features(dev
);
5689 * Default initial state at registry is that the
5690 * device is present.
5693 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5695 linkwatch_init_dev(dev
);
5697 dev_init_scheduler(dev
);
5699 list_netdevice(dev
);
5700 add_device_randomness(dev
->dev_addr
, dev
->addr_len
);
5702 /* Notify protocols, that a new device appeared. */
5703 ret
= call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
5704 ret
= notifier_to_errno(ret
);
5706 rollback_registered(dev
);
5707 dev
->reg_state
= NETREG_UNREGISTERED
;
5710 * Prevent userspace races by waiting until the network
5711 * device is fully setup before sending notifications.
5713 if (!dev
->rtnl_link_ops
||
5714 dev
->rtnl_link_state
== RTNL_LINK_INITIALIZED
)
5715 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
5721 if (dev
->netdev_ops
->ndo_uninit
)
5722 dev
->netdev_ops
->ndo_uninit(dev
);
5725 EXPORT_SYMBOL(register_netdevice
);
5728 * init_dummy_netdev - init a dummy network device for NAPI
5729 * @dev: device to init
5731 * This takes a network device structure and initialize the minimum
5732 * amount of fields so it can be used to schedule NAPI polls without
5733 * registering a full blown interface. This is to be used by drivers
5734 * that need to tie several hardware interfaces to a single NAPI
5735 * poll scheduler due to HW limitations.
5737 int init_dummy_netdev(struct net_device
*dev
)
5739 /* Clear everything. Note we don't initialize spinlocks
5740 * are they aren't supposed to be taken by any of the
5741 * NAPI code and this dummy netdev is supposed to be
5742 * only ever used for NAPI polls
5744 memset(dev
, 0, sizeof(struct net_device
));
5746 /* make sure we BUG if trying to hit standard
5747 * register/unregister code path
5749 dev
->reg_state
= NETREG_DUMMY
;
5751 /* NAPI wants this */
5752 INIT_LIST_HEAD(&dev
->napi_list
);
5754 /* a dummy interface is started by default */
5755 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
5756 set_bit(__LINK_STATE_START
, &dev
->state
);
5758 /* Note : We dont allocate pcpu_refcnt for dummy devices,
5759 * because users of this 'device' dont need to change
5765 EXPORT_SYMBOL_GPL(init_dummy_netdev
);
5769 * register_netdev - register a network device
5770 * @dev: device to register
5772 * Take a completed network device structure and add it to the kernel
5773 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5774 * chain. 0 is returned on success. A negative errno code is returned
5775 * on a failure to set up the device, or if the name is a duplicate.
5777 * This is a wrapper around register_netdevice that takes the rtnl semaphore
5778 * and expands the device name if you passed a format string to
5781 int register_netdev(struct net_device
*dev
)
5786 err
= register_netdevice(dev
);
5790 EXPORT_SYMBOL(register_netdev
);
5792 int netdev_refcnt_read(const struct net_device
*dev
)
5796 for_each_possible_cpu(i
)
5797 refcnt
+= *per_cpu_ptr(dev
->pcpu_refcnt
, i
);
5800 EXPORT_SYMBOL(netdev_refcnt_read
);
5803 * netdev_wait_allrefs - wait until all references are gone.
5804 * @dev: target net_device
5806 * This is called when unregistering network devices.
5808 * Any protocol or device that holds a reference should register
5809 * for netdevice notification, and cleanup and put back the
5810 * reference if they receive an UNREGISTER event.
5811 * We can get stuck here if buggy protocols don't correctly
5814 static void netdev_wait_allrefs(struct net_device
*dev
)
5816 unsigned long rebroadcast_time
, warning_time
;
5819 linkwatch_forget_dev(dev
);
5821 rebroadcast_time
= warning_time
= jiffies
;
5822 refcnt
= netdev_refcnt_read(dev
);
5824 while (refcnt
!= 0) {
5825 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
5828 /* Rebroadcast unregister notification */
5829 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
5835 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5836 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
5838 /* We must not have linkwatch events
5839 * pending on unregister. If this
5840 * happens, we simply run the queue
5841 * unscheduled, resulting in a noop
5844 linkwatch_run_queue();
5849 rebroadcast_time
= jiffies
;
5854 refcnt
= netdev_refcnt_read(dev
);
5856 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
5857 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
5859 warning_time
= jiffies
;
5868 * register_netdevice(x1);
5869 * register_netdevice(x2);
5871 * unregister_netdevice(y1);
5872 * unregister_netdevice(y2);
5878 * We are invoked by rtnl_unlock().
5879 * This allows us to deal with problems:
5880 * 1) We can delete sysfs objects which invoke hotplug
5881 * without deadlocking with linkwatch via keventd.
5882 * 2) Since we run with the RTNL semaphore not held, we can sleep
5883 * safely in order to wait for the netdev refcnt to drop to zero.
5885 * We must not return until all unregister events added during
5886 * the interval the lock was held have been completed.
5888 void netdev_run_todo(void)
5890 struct list_head list
;
5892 /* Snapshot list, allow later requests */
5893 list_replace_init(&net_todo_list
, &list
);
5898 /* Wait for rcu callbacks to finish before next phase */
5899 if (!list_empty(&list
))
5902 while (!list_empty(&list
)) {
5903 struct net_device
*dev
5904 = list_first_entry(&list
, struct net_device
, todo_list
);
5905 list_del(&dev
->todo_list
);
5908 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
5911 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
5912 pr_err("network todo '%s' but state %d\n",
5913 dev
->name
, dev
->reg_state
);
5918 dev
->reg_state
= NETREG_UNREGISTERED
;
5920 on_each_cpu(flush_backlog
, dev
, 1);
5922 netdev_wait_allrefs(dev
);
5925 BUG_ON(netdev_refcnt_read(dev
));
5926 WARN_ON(rcu_access_pointer(dev
->ip_ptr
));
5927 WARN_ON(rcu_access_pointer(dev
->ip6_ptr
));
5928 WARN_ON(dev
->dn_ptr
);
5930 if (dev
->destructor
)
5931 dev
->destructor(dev
);
5933 /* Free network device */
5934 kobject_put(&dev
->dev
.kobj
);
5938 /* Convert net_device_stats to rtnl_link_stats64. They have the same
5939 * fields in the same order, with only the type differing.
5941 void netdev_stats_to_stats64(struct rtnl_link_stats64
*stats64
,
5942 const struct net_device_stats
*netdev_stats
)
5944 #if BITS_PER_LONG == 64
5945 BUILD_BUG_ON(sizeof(*stats64
) != sizeof(*netdev_stats
));
5946 memcpy(stats64
, netdev_stats
, sizeof(*stats64
));
5948 size_t i
, n
= sizeof(*stats64
) / sizeof(u64
);
5949 const unsigned long *src
= (const unsigned long *)netdev_stats
;
5950 u64
*dst
= (u64
*)stats64
;
5952 BUILD_BUG_ON(sizeof(*netdev_stats
) / sizeof(unsigned long) !=
5953 sizeof(*stats64
) / sizeof(u64
));
5954 for (i
= 0; i
< n
; i
++)
5958 EXPORT_SYMBOL(netdev_stats_to_stats64
);
5961 * dev_get_stats - get network device statistics
5962 * @dev: device to get statistics from
5963 * @storage: place to store stats
5965 * Get network statistics from device. Return @storage.
5966 * The device driver may provide its own method by setting
5967 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
5968 * otherwise the internal statistics structure is used.
5970 struct rtnl_link_stats64
*dev_get_stats(struct net_device
*dev
,
5971 struct rtnl_link_stats64
*storage
)
5973 const struct net_device_ops
*ops
= dev
->netdev_ops
;
5975 if (ops
->ndo_get_stats64
) {
5976 memset(storage
, 0, sizeof(*storage
));
5977 ops
->ndo_get_stats64(dev
, storage
);
5978 } else if (ops
->ndo_get_stats
) {
5979 netdev_stats_to_stats64(storage
, ops
->ndo_get_stats(dev
));
5981 netdev_stats_to_stats64(storage
, &dev
->stats
);
5983 storage
->rx_dropped
+= atomic_long_read(&dev
->rx_dropped
);
5986 EXPORT_SYMBOL(dev_get_stats
);
5988 struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
)
5990 struct netdev_queue
*queue
= dev_ingress_queue(dev
);
5992 #ifdef CONFIG_NET_CLS_ACT
5995 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
5998 netdev_init_one_queue(dev
, queue
, NULL
);
5999 queue
->qdisc
= &noop_qdisc
;
6000 queue
->qdisc_sleeping
= &noop_qdisc
;
6001 rcu_assign_pointer(dev
->ingress_queue
, queue
);
6006 static const struct ethtool_ops default_ethtool_ops
;
6009 * alloc_netdev_mqs - allocate network device
6010 * @sizeof_priv: size of private data to allocate space for
6011 * @name: device name format string
6012 * @setup: callback to initialize device
6013 * @txqs: the number of TX subqueues to allocate
6014 * @rxqs: the number of RX subqueues to allocate
6016 * Allocates a struct net_device with private data area for driver use
6017 * and performs basic initialization. Also allocates subquue structs
6018 * for each queue on the device.
6020 struct net_device
*alloc_netdev_mqs(int sizeof_priv
, const char *name
,
6021 void (*setup
)(struct net_device
*),
6022 unsigned int txqs
, unsigned int rxqs
)
6024 struct net_device
*dev
;
6026 struct net_device
*p
;
6028 BUG_ON(strlen(name
) >= sizeof(dev
->name
));
6031 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
6037 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
6042 alloc_size
= sizeof(struct net_device
);
6044 /* ensure 32-byte alignment of private area */
6045 alloc_size
= ALIGN(alloc_size
, NETDEV_ALIGN
);
6046 alloc_size
+= sizeof_priv
;
6048 /* ensure 32-byte alignment of whole construct */
6049 alloc_size
+= NETDEV_ALIGN
- 1;
6051 p
= kzalloc(alloc_size
, GFP_KERNEL
);
6053 pr_err("alloc_netdev: Unable to allocate device\n");
6057 dev
= PTR_ALIGN(p
, NETDEV_ALIGN
);
6058 dev
->padded
= (char *)dev
- (char *)p
;
6060 dev
->pcpu_refcnt
= alloc_percpu(int);
6061 if (!dev
->pcpu_refcnt
)
6064 if (dev_addr_init(dev
))
6070 dev_net_set(dev
, &init_net
);
6072 dev
->gso_max_size
= GSO_MAX_SIZE
;
6073 dev
->gso_max_segs
= GSO_MAX_SEGS
;
6075 INIT_LIST_HEAD(&dev
->napi_list
);
6076 INIT_LIST_HEAD(&dev
->unreg_list
);
6077 INIT_LIST_HEAD(&dev
->link_watch_list
);
6078 dev
->priv_flags
= IFF_XMIT_DST_RELEASE
;
6081 dev
->num_tx_queues
= txqs
;
6082 dev
->real_num_tx_queues
= txqs
;
6083 if (netif_alloc_netdev_queues(dev
))
6087 dev
->num_rx_queues
= rxqs
;
6088 dev
->real_num_rx_queues
= rxqs
;
6089 if (netif_alloc_rx_queues(dev
))
6093 strcpy(dev
->name
, name
);
6094 dev
->group
= INIT_NETDEV_GROUP
;
6095 if (!dev
->ethtool_ops
)
6096 dev
->ethtool_ops
= &default_ethtool_ops
;
6104 free_percpu(dev
->pcpu_refcnt
);
6114 EXPORT_SYMBOL(alloc_netdev_mqs
);
6117 * free_netdev - free network device
6120 * This function does the last stage of destroying an allocated device
6121 * interface. The reference to the device object is released.
6122 * If this is the last reference then it will be freed.
6124 void free_netdev(struct net_device
*dev
)
6126 struct napi_struct
*p
, *n
;
6128 release_net(dev_net(dev
));
6135 kfree(rcu_dereference_protected(dev
->ingress_queue
, 1));
6137 /* Flush device addresses */
6138 dev_addr_flush(dev
);
6140 list_for_each_entry_safe(p
, n
, &dev
->napi_list
, dev_list
)
6143 free_percpu(dev
->pcpu_refcnt
);
6144 dev
->pcpu_refcnt
= NULL
;
6146 /* Compatibility with error handling in drivers */
6147 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
6148 kfree((char *)dev
- dev
->padded
);
6152 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
6153 dev
->reg_state
= NETREG_RELEASED
;
6155 /* will free via device release */
6156 put_device(&dev
->dev
);
6158 EXPORT_SYMBOL(free_netdev
);
6161 * synchronize_net - Synchronize with packet receive processing
6163 * Wait for packets currently being received to be done.
6164 * Does not block later packets from starting.
6166 void synchronize_net(void)
6169 if (rtnl_is_locked())
6170 synchronize_rcu_expedited();
6174 EXPORT_SYMBOL(synchronize_net
);
6177 * unregister_netdevice_queue - remove device from the kernel
6181 * This function shuts down a device interface and removes it
6182 * from the kernel tables.
6183 * If head not NULL, device is queued to be unregistered later.
6185 * Callers must hold the rtnl semaphore. You may want
6186 * unregister_netdev() instead of this.
6189 void unregister_netdevice_queue(struct net_device
*dev
, struct list_head
*head
)
6194 list_move_tail(&dev
->unreg_list
, head
);
6196 rollback_registered(dev
);
6197 /* Finish processing unregister after unlock */
6201 EXPORT_SYMBOL(unregister_netdevice_queue
);
6204 * unregister_netdevice_many - unregister many devices
6205 * @head: list of devices
6207 void unregister_netdevice_many(struct list_head
*head
)
6209 struct net_device
*dev
;
6211 if (!list_empty(head
)) {
6212 rollback_registered_many(head
);
6213 list_for_each_entry(dev
, head
, unreg_list
)
6217 EXPORT_SYMBOL(unregister_netdevice_many
);
6220 * unregister_netdev - remove device from the kernel
6223 * This function shuts down a device interface and removes it
6224 * from the kernel tables.
6226 * This is just a wrapper for unregister_netdevice that takes
6227 * the rtnl semaphore. In general you want to use this and not
6228 * unregister_netdevice.
6230 void unregister_netdev(struct net_device
*dev
)
6233 unregister_netdevice(dev
);
6236 EXPORT_SYMBOL(unregister_netdev
);
6239 * dev_change_net_namespace - move device to different nethost namespace
6241 * @net: network namespace
6242 * @pat: If not NULL name pattern to try if the current device name
6243 * is already taken in the destination network namespace.
6245 * This function shuts down a device interface and moves it
6246 * to a new network namespace. On success 0 is returned, on
6247 * a failure a netagive errno code is returned.
6249 * Callers must hold the rtnl semaphore.
6252 int dev_change_net_namespace(struct net_device
*dev
, struct net
*net
, const char *pat
)
6258 /* Don't allow namespace local devices to be moved. */
6260 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6263 /* Ensure the device has been registrered */
6265 if (dev
->reg_state
!= NETREG_REGISTERED
)
6268 /* Get out if there is nothing todo */
6270 if (net_eq(dev_net(dev
), net
))
6273 /* Pick the destination device name, and ensure
6274 * we can use it in the destination network namespace.
6277 if (__dev_get_by_name(net
, dev
->name
)) {
6278 /* We get here if we can't use the current device name */
6281 if (dev_get_valid_name(net
, dev
, pat
) < 0)
6286 * And now a mini version of register_netdevice unregister_netdevice.
6289 /* If device is running close it first. */
6292 /* And unlink it from device chain */
6294 unlist_netdevice(dev
);
6298 /* Shutdown queueing discipline. */
6301 /* Notify protocols, that we are about to destroy
6302 this device. They should clean all the things.
6304 Note that dev->reg_state stays at NETREG_REGISTERED.
6305 This is wanted because this way 8021q and macvlan know
6306 the device is just moving and can keep their slaves up.
6308 call_netdevice_notifiers(NETDEV_UNREGISTER
, dev
);
6310 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL
, dev
);
6311 rtmsg_ifinfo(RTM_DELLINK
, dev
, ~0U);
6314 * Flush the unicast and multicast chains
6319 /* Actually switch the network namespace */
6320 dev_net_set(dev
, net
);
6322 /* If there is an ifindex conflict assign a new one */
6323 if (__dev_get_by_index(net
, dev
->ifindex
)) {
6324 int iflink
= (dev
->iflink
== dev
->ifindex
);
6325 dev
->ifindex
= dev_new_index(net
);
6327 dev
->iflink
= dev
->ifindex
;
6330 /* Fixup kobjects */
6331 err
= device_rename(&dev
->dev
, dev
->name
);
6334 /* Add the device back in the hashes */
6335 list_netdevice(dev
);
6337 /* Notify protocols, that a new device appeared. */
6338 call_netdevice_notifiers(NETDEV_REGISTER
, dev
);
6341 * Prevent userspace races by waiting until the network
6342 * device is fully setup before sending notifications.
6344 rtmsg_ifinfo(RTM_NEWLINK
, dev
, ~0U);
6351 EXPORT_SYMBOL_GPL(dev_change_net_namespace
);
6353 static int dev_cpu_callback(struct notifier_block
*nfb
,
6354 unsigned long action
,
6357 struct sk_buff
**list_skb
;
6358 struct sk_buff
*skb
;
6359 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
6360 struct softnet_data
*sd
, *oldsd
;
6362 if (action
!= CPU_DEAD
&& action
!= CPU_DEAD_FROZEN
)
6365 local_irq_disable();
6366 cpu
= smp_processor_id();
6367 sd
= &per_cpu(softnet_data
, cpu
);
6368 oldsd
= &per_cpu(softnet_data
, oldcpu
);
6370 /* Find end of our completion_queue. */
6371 list_skb
= &sd
->completion_queue
;
6373 list_skb
= &(*list_skb
)->next
;
6374 /* Append completion queue from offline CPU. */
6375 *list_skb
= oldsd
->completion_queue
;
6376 oldsd
->completion_queue
= NULL
;
6378 /* Append output queue from offline CPU. */
6379 if (oldsd
->output_queue
) {
6380 *sd
->output_queue_tailp
= oldsd
->output_queue
;
6381 sd
->output_queue_tailp
= oldsd
->output_queue_tailp
;
6382 oldsd
->output_queue
= NULL
;
6383 oldsd
->output_queue_tailp
= &oldsd
->output_queue
;
6385 /* Append NAPI poll list from offline CPU. */
6386 if (!list_empty(&oldsd
->poll_list
)) {
6387 list_splice_init(&oldsd
->poll_list
, &sd
->poll_list
);
6388 raise_softirq_irqoff(NET_RX_SOFTIRQ
);
6391 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
6394 /* Process offline CPU's input_pkt_queue */
6395 while ((skb
= __skb_dequeue(&oldsd
->process_queue
))) {
6397 input_queue_head_incr(oldsd
);
6399 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
))) {
6401 input_queue_head_incr(oldsd
);
6409 * netdev_increment_features - increment feature set by one
6410 * @all: current feature set
6411 * @one: new feature set
6412 * @mask: mask feature set
6414 * Computes a new feature set after adding a device with feature set
6415 * @one to the master device with current feature set @all. Will not
6416 * enable anything that is off in @mask. Returns the new feature set.
6418 netdev_features_t
netdev_increment_features(netdev_features_t all
,
6419 netdev_features_t one
, netdev_features_t mask
)
6421 if (mask
& NETIF_F_GEN_CSUM
)
6422 mask
|= NETIF_F_ALL_CSUM
;
6423 mask
|= NETIF_F_VLAN_CHALLENGED
;
6425 all
|= one
& (NETIF_F_ONE_FOR_ALL
|NETIF_F_ALL_CSUM
) & mask
;
6426 all
&= one
| ~NETIF_F_ALL_FOR_ALL
;
6428 /* If one device supports hw checksumming, set for all. */
6429 if (all
& NETIF_F_GEN_CSUM
)
6430 all
&= ~(NETIF_F_ALL_CSUM
& ~NETIF_F_GEN_CSUM
);
6434 EXPORT_SYMBOL(netdev_increment_features
);
6436 static struct hlist_head
*netdev_create_hash(void)
6439 struct hlist_head
*hash
;
6441 hash
= kmalloc(sizeof(*hash
) * NETDEV_HASHENTRIES
, GFP_KERNEL
);
6443 for (i
= 0; i
< NETDEV_HASHENTRIES
; i
++)
6444 INIT_HLIST_HEAD(&hash
[i
]);
6449 /* Initialize per network namespace state */
6450 static int __net_init
netdev_init(struct net
*net
)
6452 if (net
!= &init_net
)
6453 INIT_LIST_HEAD(&net
->dev_base_head
);
6455 net
->dev_name_head
= netdev_create_hash();
6456 if (net
->dev_name_head
== NULL
)
6459 net
->dev_index_head
= netdev_create_hash();
6460 if (net
->dev_index_head
== NULL
)
6466 kfree(net
->dev_name_head
);
6472 * netdev_drivername - network driver for the device
6473 * @dev: network device
6475 * Determine network driver for device.
6477 const char *netdev_drivername(const struct net_device
*dev
)
6479 const struct device_driver
*driver
;
6480 const struct device
*parent
;
6481 const char *empty
= "";
6483 parent
= dev
->dev
.parent
;
6487 driver
= parent
->driver
;
6488 if (driver
&& driver
->name
)
6489 return driver
->name
;
6493 static int __netdev_printk(const char *level
, const struct net_device
*dev
,
6494 struct va_format
*vaf
)
6498 if (dev
&& dev
->dev
.parent
) {
6499 r
= dev_printk_emit(level
[1] - '0',
6502 dev_driver_string(dev
->dev
.parent
),
6503 dev_name(dev
->dev
.parent
),
6504 netdev_name(dev
), vaf
);
6506 r
= printk("%s%s: %pV", level
, netdev_name(dev
), vaf
);
6508 r
= printk("%s(NULL net_device): %pV", level
, vaf
);
6514 int netdev_printk(const char *level
, const struct net_device
*dev
,
6515 const char *format
, ...)
6517 struct va_format vaf
;
6521 va_start(args
, format
);
6526 r
= __netdev_printk(level
, dev
, &vaf
);
6532 EXPORT_SYMBOL(netdev_printk
);
6534 #define define_netdev_printk_level(func, level) \
6535 int func(const struct net_device *dev, const char *fmt, ...) \
6538 struct va_format vaf; \
6541 va_start(args, fmt); \
6546 r = __netdev_printk(level, dev, &vaf); \
6552 EXPORT_SYMBOL(func);
6554 define_netdev_printk_level(netdev_emerg
, KERN_EMERG
);
6555 define_netdev_printk_level(netdev_alert
, KERN_ALERT
);
6556 define_netdev_printk_level(netdev_crit
, KERN_CRIT
);
6557 define_netdev_printk_level(netdev_err
, KERN_ERR
);
6558 define_netdev_printk_level(netdev_warn
, KERN_WARNING
);
6559 define_netdev_printk_level(netdev_notice
, KERN_NOTICE
);
6560 define_netdev_printk_level(netdev_info
, KERN_INFO
);
6562 static void __net_exit
netdev_exit(struct net
*net
)
6564 kfree(net
->dev_name_head
);
6565 kfree(net
->dev_index_head
);
6568 static struct pernet_operations __net_initdata netdev_net_ops
= {
6569 .init
= netdev_init
,
6570 .exit
= netdev_exit
,
6573 static void __net_exit
default_device_exit(struct net
*net
)
6575 struct net_device
*dev
, *aux
;
6577 * Push all migratable network devices back to the
6578 * initial network namespace
6581 for_each_netdev_safe(net
, dev
, aux
) {
6583 char fb_name
[IFNAMSIZ
];
6585 /* Ignore unmoveable devices (i.e. loopback) */
6586 if (dev
->features
& NETIF_F_NETNS_LOCAL
)
6589 /* Leave virtual devices for the generic cleanup */
6590 if (dev
->rtnl_link_ops
)
6593 /* Push remaining network devices to init_net */
6594 snprintf(fb_name
, IFNAMSIZ
, "dev%d", dev
->ifindex
);
6595 err
= dev_change_net_namespace(dev
, &init_net
, fb_name
);
6597 pr_emerg("%s: failed to move %s to init_net: %d\n",
6598 __func__
, dev
->name
, err
);
6605 static void __net_exit
default_device_exit_batch(struct list_head
*net_list
)
6607 /* At exit all network devices most be removed from a network
6608 * namespace. Do this in the reverse order of registration.
6609 * Do this across as many network namespaces as possible to
6610 * improve batching efficiency.
6612 struct net_device
*dev
;
6614 LIST_HEAD(dev_kill_list
);
6617 list_for_each_entry(net
, net_list
, exit_list
) {
6618 for_each_netdev_reverse(net
, dev
) {
6619 if (dev
->rtnl_link_ops
)
6620 dev
->rtnl_link_ops
->dellink(dev
, &dev_kill_list
);
6622 unregister_netdevice_queue(dev
, &dev_kill_list
);
6625 unregister_netdevice_many(&dev_kill_list
);
6626 list_del(&dev_kill_list
);
6630 static struct pernet_operations __net_initdata default_device_ops
= {
6631 .exit
= default_device_exit
,
6632 .exit_batch
= default_device_exit_batch
,
6636 * Initialize the DEV module. At boot time this walks the device list and
6637 * unhooks any devices that fail to initialise (normally hardware not
6638 * present) and leaves us with a valid list of present and active devices.
6643 * This is called single threaded during boot, so no need
6644 * to take the rtnl semaphore.
6646 static int __init
net_dev_init(void)
6648 int i
, rc
= -ENOMEM
;
6650 BUG_ON(!dev_boot_phase
);
6652 if (dev_proc_init())
6655 if (netdev_kobject_init())
6658 INIT_LIST_HEAD(&ptype_all
);
6659 for (i
= 0; i
< PTYPE_HASH_SIZE
; i
++)
6660 INIT_LIST_HEAD(&ptype_base
[i
]);
6662 if (register_pernet_subsys(&netdev_net_ops
))
6666 * Initialise the packet receive queues.
6669 for_each_possible_cpu(i
) {
6670 struct softnet_data
*sd
= &per_cpu(softnet_data
, i
);
6672 memset(sd
, 0, sizeof(*sd
));
6673 skb_queue_head_init(&sd
->input_pkt_queue
);
6674 skb_queue_head_init(&sd
->process_queue
);
6675 sd
->completion_queue
= NULL
;
6676 INIT_LIST_HEAD(&sd
->poll_list
);
6677 sd
->output_queue
= NULL
;
6678 sd
->output_queue_tailp
= &sd
->output_queue
;
6680 sd
->csd
.func
= rps_trigger_softirq
;
6686 sd
->backlog
.poll
= process_backlog
;
6687 sd
->backlog
.weight
= weight_p
;
6688 sd
->backlog
.gro_list
= NULL
;
6689 sd
->backlog
.gro_count
= 0;
6694 /* The loopback device is special if any other network devices
6695 * is present in a network namespace the loopback device must
6696 * be present. Since we now dynamically allocate and free the
6697 * loopback device ensure this invariant is maintained by
6698 * keeping the loopback device as the first device on the
6699 * list of network devices. Ensuring the loopback devices
6700 * is the first device that appears and the last network device
6703 if (register_pernet_device(&loopback_net_ops
))
6706 if (register_pernet_device(&default_device_ops
))
6709 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
);
6710 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
);
6712 hotcpu_notifier(dev_cpu_callback
, 0);
6720 subsys_initcall(net_dev_init
);
6722 static int __init
initialize_hashrnd(void)
6724 get_random_bytes(&hashrnd
, sizeof(hashrnd
));
6728 late_initcall_sync(initialize_hashrnd
);