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 DEFINE_SPINLOCK(offload_lock);
180 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
181 static struct list_head ptype_all __read_mostly; /* Taps */
182 static struct list_head offload_base __read_mostly;
185 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
188 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
190 * Writers must hold the rtnl semaphore while they loop through the
191 * dev_base_head list, and hold dev_base_lock for writing when they do the
192 * actual updates. This allows pure readers to access the list even
193 * while a writer is preparing to update it.
195 * To put it another way, dev_base_lock is held for writing only to
196 * protect against pure readers; the rtnl semaphore provides the
197 * protection against other writers.
199 * See, for example usages, register_netdevice() and
200 * unregister_netdevice(), which must be called with the rtnl
203 DEFINE_RWLOCK(dev_base_lock);
204 EXPORT_SYMBOL(dev_base_lock);
206 seqcount_t devnet_rename_seq;
208 static inline void dev_base_seq_inc(struct net *net)
210 while (++net->dev_base_seq == 0);
213 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
215 unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
217 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
220 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
222 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
225 static inline void rps_lock(struct softnet_data *sd)
228 spin_lock(&sd->input_pkt_queue.lock);
232 static inline void rps_unlock(struct softnet_data *sd)
235 spin_unlock(&sd->input_pkt_queue.lock);
239 /* Device list insertion */
240 static int list_netdevice(struct net_device *dev)
242 struct net *net = dev_net(dev);
246 write_lock_bh(&dev_base_lock);
247 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
248 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
249 hlist_add_head_rcu(&dev->index_hlist,
250 dev_index_hash(net, dev->ifindex));
251 write_unlock_bh(&dev_base_lock);
253 dev_base_seq_inc(net);
258 /* Device list removal
259 * caller must respect a RCU grace period before freeing/reusing dev
261 static void unlist_netdevice(struct net_device *dev)
265 /* Unlink dev from the device chain */
266 write_lock_bh(&dev_base_lock);
267 list_del_rcu(&dev->dev_list);
268 hlist_del_rcu(&dev->name_hlist);
269 hlist_del_rcu(&dev->index_hlist);
270 write_unlock_bh(&dev_base_lock);
272 dev_base_seq_inc(dev_net(dev));
279 static RAW_NOTIFIER_HEAD(netdev_chain);
282 * Device drivers call our routines to queue packets here. We empty the
283 * queue in the local softnet handler.
286 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
287 EXPORT_PER_CPU_SYMBOL(softnet_data);
289 #ifdef CONFIG_LOCKDEP
291 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
292 * according to dev->type
294 static const unsigned short netdev_lock_type[] =
295 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
296 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
297 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
298 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
299 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
300 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
301 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
302 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
303 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
304 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
305 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
306 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
307 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
308 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
309 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
311 static const char *const netdev_lock_name[] =
312 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
313 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
314 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
315 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
316 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
317 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
318 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
319 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
320 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
321 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
322 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
323 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
324 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
325 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
326 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
328 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
329 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
331 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
335 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
336 if (netdev_lock_type[i] == dev_type)
338 /* the last key is used by default */
339 return ARRAY_SIZE(netdev_lock_type) - 1;
342 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
343 unsigned short dev_type)
347 i = netdev_lock_pos(dev_type);
348 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
349 netdev_lock_name[i]);
352 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
356 i = netdev_lock_pos(dev->type);
357 lockdep_set_class_and_name(&dev->addr_list_lock,
358 &netdev_addr_lock_key[i],
359 netdev_lock_name[i]);
362 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
363 unsigned short dev_type)
366 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
371 /*******************************************************************************
373 Protocol management and registration routines
375 *******************************************************************************/
378 * Add a protocol ID to the list. Now that the input handler is
379 * smarter we can dispense with all the messy stuff that used to be
382 * BEWARE!!! Protocol handlers, mangling input packets,
383 * MUST BE last in hash buckets and checking protocol handlers
384 * MUST start from promiscuous ptype_all chain in net_bh.
385 * It is true now, do not change it.
386 * Explanation follows: if protocol handler, mangling packet, will
387 * be the first on list, it is not able to sense, that packet
388 * is cloned and should be copied-on-write, so that it will
389 * change it and subsequent readers will get broken packet.
393 static inline struct list_head *ptype_head(const struct packet_type *pt)
395 if (pt->type == htons(ETH_P_ALL))
398 return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
402 * dev_add_pack - add packet handler
403 * @pt: packet type declaration
405 * Add a protocol handler to the networking stack. The passed &packet_type
406 * is linked into kernel lists and may not be freed until it has been
407 * removed from the kernel lists.
409 * This call does not sleep therefore it can not
410 * guarantee all CPU's that are in middle of receiving packets
411 * will see the new packet type (until the next received packet).
414 void dev_add_pack(struct packet_type *pt)
416 struct list_head *head = ptype_head(pt);
418 spin_lock(&ptype_lock);
419 list_add_rcu(&pt->list, head);
420 spin_unlock(&ptype_lock);
422 EXPORT_SYMBOL(dev_add_pack);
425 * __dev_remove_pack - remove packet handler
426 * @pt: packet type declaration
428 * Remove a protocol handler that was previously added to the kernel
429 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
430 * from the kernel lists and can be freed or reused once this function
433 * The packet type might still be in use by receivers
434 * and must not be freed until after all the CPU's have gone
435 * through a quiescent state.
437 void __dev_remove_pack(struct packet_type *pt)
439 struct list_head *head = ptype_head(pt);
440 struct packet_type *pt1;
442 spin_lock(&ptype_lock);
444 list_for_each_entry(pt1, head, list) {
446 list_del_rcu(&pt->list);
451 pr_warn("dev_remove_pack: %p not found\n", pt);
453 spin_unlock(&ptype_lock);
455 EXPORT_SYMBOL(__dev_remove_pack);
458 * dev_remove_pack - remove packet handler
459 * @pt: packet type declaration
461 * Remove a protocol handler that was previously added to the kernel
462 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
463 * from the kernel lists and can be freed or reused once this function
466 * This call sleeps to guarantee that no CPU is looking at the packet
469 void dev_remove_pack(struct packet_type *pt)
471 __dev_remove_pack(pt);
475 EXPORT_SYMBOL(dev_remove_pack);
479 * dev_add_offload - register offload handlers
480 * @po: protocol offload declaration
482 * Add protocol offload handlers to the networking stack. The passed
483 * &proto_offload is linked into kernel lists and may not be freed until
484 * it has been removed from the kernel lists.
486 * This call does not sleep therefore it can not
487 * guarantee all CPU's that are in middle of receiving packets
488 * will see the new offload handlers (until the next received packet).
490 void dev_add_offload(struct packet_offload *po)
492 struct list_head *head = &offload_base;
494 spin_lock(&offload_lock);
495 list_add_rcu(&po->list, head);
496 spin_unlock(&offload_lock);
498 EXPORT_SYMBOL(dev_add_offload);
501 * __dev_remove_offload - remove offload handler
502 * @po: packet offload declaration
504 * Remove a protocol offload handler that was previously added to the
505 * kernel offload handlers by dev_add_offload(). The passed &offload_type
506 * is removed from the kernel lists and can be freed or reused once this
509 * The packet type might still be in use by receivers
510 * and must not be freed until after all the CPU's have gone
511 * through a quiescent state.
513 void __dev_remove_offload(struct packet_offload *po)
515 struct list_head *head = &offload_base;
516 struct packet_offload *po1;
518 spin_lock(&offload_lock);
520 list_for_each_entry(po1, head, list) {
522 list_del_rcu(&po->list);
527 pr_warn("dev_remove_offload: %p not found\n", po);
529 spin_unlock(&offload_lock);
531 EXPORT_SYMBOL(__dev_remove_offload);
534 * dev_remove_offload - remove packet offload handler
535 * @po: packet offload declaration
537 * Remove a packet offload handler that was previously added to the kernel
538 * offload handlers by dev_add_offload(). The passed &offload_type is
539 * removed from the kernel lists and can be freed or reused once this
542 * This call sleeps to guarantee that no CPU is looking at the packet
545 void dev_remove_offload(struct packet_offload *po)
547 __dev_remove_offload(po);
551 EXPORT_SYMBOL(dev_remove_offload);
553 /******************************************************************************
555 Device Boot-time Settings Routines
557 *******************************************************************************/
559 /* Boot time configuration table */
560 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
563 * netdev_boot_setup_add - add new setup entry
564 * @name: name of the device
565 * @map: configured settings for the device
567 * Adds new setup entry to the dev_boot_setup list. The function
568 * returns 0 on error and 1 on success. This is a generic routine to
571 static int netdev_boot_setup_add(char *name, struct ifmap *map)
573 struct netdev_boot_setup *s;
577 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
578 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
579 memset(s[i].name, 0, sizeof(s[i].name));
580 strlcpy(s[i].name, name, IFNAMSIZ);
581 memcpy(&s[i].map, map, sizeof(s[i].map));
586 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
590 * netdev_boot_setup_check - check boot time settings
591 * @dev: the netdevice
593 * Check boot time settings for the device.
594 * The found settings are set for the device to be used
595 * later in the device probing.
596 * Returns 0 if no settings found, 1 if they are.
598 int netdev_boot_setup_check(struct net_device *dev)
600 struct netdev_boot_setup *s = dev_boot_setup;
603 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
604 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
605 !strcmp(dev->name, s[i].name)) {
606 dev->irq = s[i].map.irq;
607 dev->base_addr = s[i].map.base_addr;
608 dev->mem_start = s[i].map.mem_start;
609 dev->mem_end = s[i].map.mem_end;
615 EXPORT_SYMBOL(netdev_boot_setup_check);
619 * netdev_boot_base - get address from boot time settings
620 * @prefix: prefix for network device
621 * @unit: id for network device
623 * Check boot time settings for the base address of device.
624 * The found settings are set for the device to be used
625 * later in the device probing.
626 * Returns 0 if no settings found.
628 unsigned long netdev_boot_base(const char *prefix, int unit)
630 const struct netdev_boot_setup *s = dev_boot_setup;
634 sprintf(name, "%s%d", prefix, unit);
637 * If device already registered then return base of 1
638 * to indicate not to probe for this interface
640 if (__dev_get_by_name(&init_net, name))
643 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
644 if (!strcmp(name, s[i].name))
645 return s[i].map.base_addr;
650 * Saves at boot time configured settings for any netdevice.
652 int __init netdev_boot_setup(char *str)
657 str = get_options(str, ARRAY_SIZE(ints), ints);
662 memset(&map, 0, sizeof(map));
666 map.base_addr = ints[2];
668 map.mem_start = ints[3];
670 map.mem_end = ints[4];
672 /* Add new entry to the list */
673 return netdev_boot_setup_add(str, &map);
676 __setup("netdev=", netdev_boot_setup);
678 /*******************************************************************************
680 Device Interface Subroutines
682 *******************************************************************************/
685 * __dev_get_by_name - find a device by its name
686 * @net: the applicable net namespace
687 * @name: name to find
689 * Find an interface by name. Must be called under RTNL semaphore
690 * or @dev_base_lock. If the name is found a pointer to the device
691 * is returned. If the name is not found then %NULL is returned. The
692 * reference counters are not incremented so the caller must be
693 * careful with locks.
696 struct net_device *__dev_get_by_name(struct net *net, const char *name)
698 struct hlist_node *p;
699 struct net_device *dev;
700 struct hlist_head *head = dev_name_hash(net, name);
702 hlist_for_each_entry(dev, p, head, name_hlist)
703 if (!strncmp(dev->name, name, IFNAMSIZ))
708 EXPORT_SYMBOL(__dev_get_by_name);
711 * dev_get_by_name_rcu - find a device by its name
712 * @net: the applicable net namespace
713 * @name: name to find
715 * Find an interface by name.
716 * If the name is found a pointer to the device is returned.
717 * If the name is not found then %NULL is returned.
718 * The reference counters are not incremented so the caller must be
719 * careful with locks. The caller must hold RCU lock.
722 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
724 struct hlist_node *p;
725 struct net_device *dev;
726 struct hlist_head *head = dev_name_hash(net, name);
728 hlist_for_each_entry_rcu(dev, p, head, name_hlist)
729 if (!strncmp(dev->name, name, IFNAMSIZ))
734 EXPORT_SYMBOL(dev_get_by_name_rcu);
737 * dev_get_by_name - find a device by its name
738 * @net: the applicable net namespace
739 * @name: name to find
741 * Find an interface by name. This can be called from any
742 * context and does its own locking. The returned handle has
743 * the usage count incremented and the caller must use dev_put() to
744 * release it when it is no longer needed. %NULL is returned if no
745 * matching device is found.
748 struct net_device *dev_get_by_name(struct net *net, const char *name)
750 struct net_device *dev;
753 dev = dev_get_by_name_rcu(net, name);
759 EXPORT_SYMBOL(dev_get_by_name);
762 * __dev_get_by_index - find a device by its ifindex
763 * @net: the applicable net namespace
764 * @ifindex: index of device
766 * Search for an interface by index. Returns %NULL if the device
767 * is not found or a pointer to the device. The device has not
768 * had its reference counter increased so the caller must be careful
769 * about locking. The caller must hold either the RTNL semaphore
773 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
775 struct hlist_node *p;
776 struct net_device *dev;
777 struct hlist_head *head = dev_index_hash(net, ifindex);
779 hlist_for_each_entry(dev, p, head, index_hlist)
780 if (dev->ifindex == ifindex)
785 EXPORT_SYMBOL(__dev_get_by_index);
788 * dev_get_by_index_rcu - find a device by its ifindex
789 * @net: the applicable net namespace
790 * @ifindex: index of device
792 * Search for an interface by index. Returns %NULL if the device
793 * is not found or a pointer to the device. The device has not
794 * had its reference counter increased so the caller must be careful
795 * about locking. The caller must hold RCU lock.
798 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
800 struct hlist_node *p;
801 struct net_device *dev;
802 struct hlist_head *head = dev_index_hash(net, ifindex);
804 hlist_for_each_entry_rcu(dev, p, head, index_hlist)
805 if (dev->ifindex == ifindex)
810 EXPORT_SYMBOL(dev_get_by_index_rcu);
814 * dev_get_by_index - find a device by its ifindex
815 * @net: the applicable net namespace
816 * @ifindex: index of device
818 * Search for an interface by index. Returns NULL if the device
819 * is not found or a pointer to the device. The device returned has
820 * had a reference added and the pointer is safe until the user calls
821 * dev_put to indicate they have finished with it.
824 struct net_device *dev_get_by_index(struct net *net, int ifindex)
826 struct net_device *dev;
829 dev = dev_get_by_index_rcu(net, ifindex);
835 EXPORT_SYMBOL(dev_get_by_index);
838 * dev_getbyhwaddr_rcu - find a device by its hardware address
839 * @net: the applicable net namespace
840 * @type: media type of device
841 * @ha: hardware address
843 * Search for an interface by MAC address. Returns NULL if the device
844 * is not found or a pointer to the device.
845 * The caller must hold RCU or RTNL.
846 * The returned device has not had its ref count increased
847 * and the caller must therefore be careful about locking
851 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
854 struct net_device *dev;
856 for_each_netdev_rcu(net, dev)
857 if (dev->type == type &&
858 !memcmp(dev->dev_addr, ha, dev->addr_len))
863 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
865 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
867 struct net_device *dev;
870 for_each_netdev(net, dev)
871 if (dev->type == type)
876 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
878 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
880 struct net_device *dev, *ret = NULL;
883 for_each_netdev_rcu(net, dev)
884 if (dev->type == type) {
892 EXPORT_SYMBOL(dev_getfirstbyhwtype);
895 * dev_get_by_flags_rcu - find any device with given flags
896 * @net: the applicable net namespace
897 * @if_flags: IFF_* values
898 * @mask: bitmask of bits in if_flags to check
900 * Search for any interface with the given flags. Returns NULL if a device
901 * is not found or a pointer to the device. Must be called inside
902 * rcu_read_lock(), and result refcount is unchanged.
905 struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
908 struct net_device *dev, *ret;
911 for_each_netdev_rcu(net, dev) {
912 if (((dev->flags ^ if_flags) & mask) == 0) {
919 EXPORT_SYMBOL(dev_get_by_flags_rcu);
922 * dev_valid_name - check if name is okay for network device
925 * Network device names need to be valid file names to
926 * to allow sysfs to work. We also disallow any kind of
929 bool dev_valid_name(const char *name)
933 if (strlen(name) >= IFNAMSIZ)
935 if (!strcmp(name, ".") || !strcmp(name, ".."))
939 if (*name == '/' || isspace(*name))
945 EXPORT_SYMBOL(dev_valid_name);
948 * __dev_alloc_name - allocate a name for a device
949 * @net: network namespace to allocate the device name in
950 * @name: name format string
951 * @buf: scratch buffer and result name string
953 * Passed a format string - eg "lt%d" it will try and find a suitable
954 * id. It scans list of devices to build up a free map, then chooses
955 * the first empty slot. The caller must hold the dev_base or rtnl lock
956 * while allocating the name and adding the device in order to avoid
958 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
959 * Returns the number of the unit assigned or a negative errno code.
962 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
966 const int max_netdevices = 8*PAGE_SIZE;
967 unsigned long *inuse;
968 struct net_device *d;
970 p = strnchr(name, IFNAMSIZ-1, '%');
973 * Verify the string as this thing may have come from
974 * the user. There must be either one "%d" and no other "%"
977 if (p[1] != 'd' || strchr(p + 2, '%'))
980 /* Use one page as a bit array of possible slots */
981 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
985 for_each_netdev(net, d) {
986 if (!sscanf(d->name, name, &i))
988 if (i < 0 || i >= max_netdevices)
991 /* avoid cases where sscanf is not exact inverse of printf */
992 snprintf(buf, IFNAMSIZ, name, i);
993 if (!strncmp(buf, d->name, IFNAMSIZ))
997 i = find_first_zero_bit(inuse, max_netdevices);
998 free_page((unsigned long) inuse);
1002 snprintf(buf, IFNAMSIZ, name, i);
1003 if (!__dev_get_by_name(net, buf))
1006 /* It is possible to run out of possible slots
1007 * when the name is long and there isn't enough space left
1008 * for the digits, or if all bits are used.
1014 * dev_alloc_name - allocate a name for a device
1016 * @name: name format string
1018 * Passed a format string - eg "lt%d" it will try and find a suitable
1019 * id. It scans list of devices to build up a free map, then chooses
1020 * the first empty slot. The caller must hold the dev_base or rtnl lock
1021 * while allocating the name and adding the device in order to avoid
1023 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1024 * Returns the number of the unit assigned or a negative errno code.
1027 int dev_alloc_name(struct net_device *dev, const char *name)
1033 BUG_ON(!dev_net(dev));
1035 ret = __dev_alloc_name(net, name, buf);
1037 strlcpy(dev->name, buf, IFNAMSIZ);
1040 EXPORT_SYMBOL(dev_alloc_name);
1042 static int dev_alloc_name_ns(struct net *net,
1043 struct net_device *dev,
1049 ret = __dev_alloc_name(net, name, buf);
1051 strlcpy(dev->name, buf, IFNAMSIZ);
1055 static int dev_get_valid_name(struct net *net,
1056 struct net_device *dev,
1061 if (!dev_valid_name(name))
1064 if (strchr(name, '%'))
1065 return dev_alloc_name_ns(net, dev, name);
1066 else if (__dev_get_by_name(net, name))
1068 else if (dev->name != name)
1069 strlcpy(dev->name, name, IFNAMSIZ);
1075 * dev_change_name - change name of a device
1077 * @newname: name (or format string) must be at least IFNAMSIZ
1079 * Change name of a device, can pass format strings "eth%d".
1082 int dev_change_name(struct net_device *dev, const char *newname)
1084 char oldname[IFNAMSIZ];
1090 BUG_ON(!dev_net(dev));
1093 if (dev->flags & IFF_UP)
1096 write_seqcount_begin(&devnet_rename_seq);
1098 if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
1099 write_seqcount_end(&devnet_rename_seq);
1103 memcpy(oldname, dev->name, IFNAMSIZ);
1105 err = dev_get_valid_name(net, dev, newname);
1107 write_seqcount_end(&devnet_rename_seq);
1112 ret = device_rename(&dev->dev, dev->name);
1114 memcpy(dev->name, oldname, IFNAMSIZ);
1115 write_seqcount_end(&devnet_rename_seq);
1119 write_seqcount_end(&devnet_rename_seq);
1121 write_lock_bh(&dev_base_lock);
1122 hlist_del_rcu(&dev->name_hlist);
1123 write_unlock_bh(&dev_base_lock);
1127 write_lock_bh(&dev_base_lock);
1128 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1129 write_unlock_bh(&dev_base_lock);
1131 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1132 ret = notifier_to_errno(ret);
1135 /* err >= 0 after dev_alloc_name() or stores the first errno */
1138 write_seqcount_begin(&devnet_rename_seq);
1139 memcpy(dev->name, oldname, IFNAMSIZ);
1142 pr_err("%s: name change rollback failed: %d\n",
1151 * dev_set_alias - change ifalias of a device
1153 * @alias: name up to IFALIASZ
1154 * @len: limit of bytes to copy from info
1156 * Set ifalias for a device,
1158 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1164 if (len >= IFALIASZ)
1168 kfree(dev->ifalias);
1169 dev->ifalias = NULL;
1173 new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1176 dev->ifalias = new_ifalias;
1178 strlcpy(dev->ifalias, alias, len+1);
1184 * netdev_features_change - device changes features
1185 * @dev: device to cause notification
1187 * Called to indicate a device has changed features.
1189 void netdev_features_change(struct net_device *dev)
1191 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1193 EXPORT_SYMBOL(netdev_features_change);
1196 * netdev_state_change - device changes state
1197 * @dev: device to cause notification
1199 * Called to indicate a device has changed state. This function calls
1200 * the notifier chains for netdev_chain and sends a NEWLINK message
1201 * to the routing socket.
1203 void netdev_state_change(struct net_device *dev)
1205 if (dev->flags & IFF_UP) {
1206 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1207 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1210 EXPORT_SYMBOL(netdev_state_change);
1213 * netdev_notify_peers - notify network peers about existence of @dev
1214 * @dev: network device
1216 * Generate traffic such that interested network peers are aware of
1217 * @dev, such as by generating a gratuitous ARP. This may be used when
1218 * a device wants to inform the rest of the network about some sort of
1219 * reconfiguration such as a failover event or virtual machine
1222 void netdev_notify_peers(struct net_device *dev)
1225 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
1228 EXPORT_SYMBOL(netdev_notify_peers);
1231 * dev_load - load a network module
1232 * @net: the applicable net namespace
1233 * @name: name of interface
1235 * If a network interface is not present and the process has suitable
1236 * privileges this function loads the module. If module loading is not
1237 * available in this kernel then it becomes a nop.
1240 void dev_load(struct net *net, const char *name)
1242 struct net_device *dev;
1246 dev = dev_get_by_name_rcu(net, name);
1250 if (no_module && capable(CAP_NET_ADMIN))
1251 no_module = request_module("netdev-%s", name);
1252 if (no_module && capable(CAP_SYS_MODULE)) {
1253 if (!request_module("%s", name))
1254 pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
1258 EXPORT_SYMBOL(dev_load);
1260 static int __dev_open(struct net_device *dev)
1262 const struct net_device_ops *ops = dev->netdev_ops;
1267 if (!netif_device_present(dev))
1270 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1271 ret = notifier_to_errno(ret);
1275 set_bit(__LINK_STATE_START, &dev->state);
1277 if (ops->ndo_validate_addr)
1278 ret = ops->ndo_validate_addr(dev);
1280 if (!ret && ops->ndo_open)
1281 ret = ops->ndo_open(dev);
1284 clear_bit(__LINK_STATE_START, &dev->state);
1286 dev->flags |= IFF_UP;
1287 net_dmaengine_get();
1288 dev_set_rx_mode(dev);
1290 add_device_randomness(dev->dev_addr, dev->addr_len);
1297 * dev_open - prepare an interface for use.
1298 * @dev: device to open
1300 * Takes a device from down to up state. The device's private open
1301 * function is invoked and then the multicast lists are loaded. Finally
1302 * the device is moved into the up state and a %NETDEV_UP message is
1303 * sent to the netdev notifier chain.
1305 * Calling this function on an active interface is a nop. On a failure
1306 * a negative errno code is returned.
1308 int dev_open(struct net_device *dev)
1312 if (dev->flags & IFF_UP)
1315 ret = __dev_open(dev);
1319 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1320 call_netdevice_notifiers(NETDEV_UP, dev);
1324 EXPORT_SYMBOL(dev_open);
1326 static int __dev_close_many(struct list_head *head)
1328 struct net_device *dev;
1333 list_for_each_entry(dev, head, unreg_list) {
1334 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1336 clear_bit(__LINK_STATE_START, &dev->state);
1338 /* Synchronize to scheduled poll. We cannot touch poll list, it
1339 * can be even on different cpu. So just clear netif_running().
1341 * dev->stop() will invoke napi_disable() on all of it's
1342 * napi_struct instances on this device.
1344 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1347 dev_deactivate_many(head);
1349 list_for_each_entry(dev, head, unreg_list) {
1350 const struct net_device_ops *ops = dev->netdev_ops;
1353 * Call the device specific close. This cannot fail.
1354 * Only if device is UP
1356 * We allow it to be called even after a DETACH hot-plug
1362 dev->flags &= ~IFF_UP;
1363 net_dmaengine_put();
1369 static int __dev_close(struct net_device *dev)
1374 list_add(&dev->unreg_list, &single);
1375 retval = __dev_close_many(&single);
1380 static int dev_close_many(struct list_head *head)
1382 struct net_device *dev, *tmp;
1383 LIST_HEAD(tmp_list);
1385 list_for_each_entry_safe(dev, tmp, head, unreg_list)
1386 if (!(dev->flags & IFF_UP))
1387 list_move(&dev->unreg_list, &tmp_list);
1389 __dev_close_many(head);
1391 list_for_each_entry(dev, head, unreg_list) {
1392 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1393 call_netdevice_notifiers(NETDEV_DOWN, dev);
1396 /* rollback_registered_many needs the complete original list */
1397 list_splice(&tmp_list, head);
1402 * dev_close - shutdown an interface.
1403 * @dev: device to shutdown
1405 * This function moves an active device into down state. A
1406 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1407 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1410 int dev_close(struct net_device *dev)
1412 if (dev->flags & IFF_UP) {
1415 list_add(&dev->unreg_list, &single);
1416 dev_close_many(&single);
1421 EXPORT_SYMBOL(dev_close);
1425 * dev_disable_lro - disable Large Receive Offload on a device
1428 * Disable Large Receive Offload (LRO) on a net device. Must be
1429 * called under RTNL. This is needed if received packets may be
1430 * forwarded to another interface.
1432 void dev_disable_lro(struct net_device *dev)
1435 * If we're trying to disable lro on a vlan device
1436 * use the underlying physical device instead
1438 if (is_vlan_dev(dev))
1439 dev = vlan_dev_real_dev(dev);
1441 dev->wanted_features &= ~NETIF_F_LRO;
1442 netdev_update_features(dev);
1444 if (unlikely(dev->features & NETIF_F_LRO))
1445 netdev_WARN(dev, "failed to disable LRO!\n");
1447 EXPORT_SYMBOL(dev_disable_lro);
1450 static int dev_boot_phase = 1;
1453 * register_netdevice_notifier - register a network notifier block
1456 * Register a notifier to be called when network device events occur.
1457 * The notifier passed is linked into the kernel structures and must
1458 * not be reused until it has been unregistered. A negative errno code
1459 * is returned on a failure.
1461 * When registered all registration and up events are replayed
1462 * to the new notifier to allow device to have a race free
1463 * view of the network device list.
1466 int register_netdevice_notifier(struct notifier_block *nb)
1468 struct net_device *dev;
1469 struct net_device *last;
1474 err = raw_notifier_chain_register(&netdev_chain, nb);
1480 for_each_netdev(net, dev) {
1481 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1482 err = notifier_to_errno(err);
1486 if (!(dev->flags & IFF_UP))
1489 nb->notifier_call(nb, NETDEV_UP, dev);
1500 for_each_netdev(net, dev) {
1504 if (dev->flags & IFF_UP) {
1505 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1506 nb->notifier_call(nb, NETDEV_DOWN, dev);
1508 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1513 raw_notifier_chain_unregister(&netdev_chain, nb);
1516 EXPORT_SYMBOL(register_netdevice_notifier);
1519 * unregister_netdevice_notifier - unregister a network notifier block
1522 * Unregister a notifier previously registered by
1523 * register_netdevice_notifier(). The notifier is unlinked into the
1524 * kernel structures and may then be reused. A negative errno code
1525 * is returned on a failure.
1527 * After unregistering unregister and down device events are synthesized
1528 * for all devices on the device list to the removed notifier to remove
1529 * the need for special case cleanup code.
1532 int unregister_netdevice_notifier(struct notifier_block *nb)
1534 struct net_device *dev;
1539 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1544 for_each_netdev(net, dev) {
1545 if (dev->flags & IFF_UP) {
1546 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1547 nb->notifier_call(nb, NETDEV_DOWN, dev);
1549 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1556 EXPORT_SYMBOL(unregister_netdevice_notifier);
1559 * call_netdevice_notifiers - call all network notifier blocks
1560 * @val: value passed unmodified to notifier function
1561 * @dev: net_device pointer passed unmodified to notifier function
1563 * Call all network notifier blocks. Parameters and return value
1564 * are as for raw_notifier_call_chain().
1567 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1570 return raw_notifier_call_chain(&netdev_chain, val, dev);
1572 EXPORT_SYMBOL(call_netdevice_notifiers);
1574 static struct static_key netstamp_needed __read_mostly;
1575 #ifdef HAVE_JUMP_LABEL
1576 /* We are not allowed to call static_key_slow_dec() from irq context
1577 * If net_disable_timestamp() is called from irq context, defer the
1578 * static_key_slow_dec() calls.
1580 static atomic_t netstamp_needed_deferred;
1583 void net_enable_timestamp(void)
1585 #ifdef HAVE_JUMP_LABEL
1586 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
1590 static_key_slow_dec(&netstamp_needed);
1594 WARN_ON(in_interrupt());
1595 static_key_slow_inc(&netstamp_needed);
1597 EXPORT_SYMBOL(net_enable_timestamp);
1599 void net_disable_timestamp(void)
1601 #ifdef HAVE_JUMP_LABEL
1602 if (in_interrupt()) {
1603 atomic_inc(&netstamp_needed_deferred);
1607 static_key_slow_dec(&netstamp_needed);
1609 EXPORT_SYMBOL(net_disable_timestamp);
1611 static inline void net_timestamp_set(struct sk_buff *skb)
1613 skb->tstamp.tv64 = 0;
1614 if (static_key_false(&netstamp_needed))
1615 __net_timestamp(skb);
1618 #define net_timestamp_check(COND, SKB) \
1619 if (static_key_false(&netstamp_needed)) { \
1620 if ((COND) && !(SKB)->tstamp.tv64) \
1621 __net_timestamp(SKB); \
1624 static int net_hwtstamp_validate(struct ifreq *ifr)
1626 struct hwtstamp_config cfg;
1627 enum hwtstamp_tx_types tx_type;
1628 enum hwtstamp_rx_filters rx_filter;
1629 int tx_type_valid = 0;
1630 int rx_filter_valid = 0;
1632 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
1635 if (cfg.flags) /* reserved for future extensions */
1638 tx_type = cfg.tx_type;
1639 rx_filter = cfg.rx_filter;
1642 case HWTSTAMP_TX_OFF:
1643 case HWTSTAMP_TX_ON:
1644 case HWTSTAMP_TX_ONESTEP_SYNC:
1649 switch (rx_filter) {
1650 case HWTSTAMP_FILTER_NONE:
1651 case HWTSTAMP_FILTER_ALL:
1652 case HWTSTAMP_FILTER_SOME:
1653 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
1654 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
1655 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
1656 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
1657 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
1658 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
1659 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
1660 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
1661 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
1662 case HWTSTAMP_FILTER_PTP_V2_EVENT:
1663 case HWTSTAMP_FILTER_PTP_V2_SYNC:
1664 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
1665 rx_filter_valid = 1;
1669 if (!tx_type_valid || !rx_filter_valid)
1675 static inline bool is_skb_forwardable(struct net_device *dev,
1676 struct sk_buff *skb)
1680 if (!(dev->flags & IFF_UP))
1683 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1684 if (skb->len <= len)
1687 /* if TSO is enabled, we don't care about the length as the packet
1688 * could be forwarded without being segmented before
1690 if (skb_is_gso(skb))
1697 * dev_forward_skb - loopback an skb to another netif
1699 * @dev: destination network device
1700 * @skb: buffer to forward
1703 * NET_RX_SUCCESS (no congestion)
1704 * NET_RX_DROP (packet was dropped, but freed)
1706 * dev_forward_skb can be used for injecting an skb from the
1707 * start_xmit function of one device into the receive queue
1708 * of another device.
1710 * The receiving device may be in another namespace, so
1711 * we have to clear all information in the skb that could
1712 * impact namespace isolation.
1714 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1716 if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
1717 if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
1718 atomic_long_inc(&dev->rx_dropped);
1727 if (unlikely(!is_skb_forwardable(dev, skb))) {
1728 atomic_long_inc(&dev->rx_dropped);
1735 skb->tstamp.tv64 = 0;
1736 skb->pkt_type = PACKET_HOST;
1737 skb->protocol = eth_type_trans(skb, dev);
1741 return netif_rx(skb);
1743 EXPORT_SYMBOL_GPL(dev_forward_skb);
1745 static inline int deliver_skb(struct sk_buff *skb,
1746 struct packet_type *pt_prev,
1747 struct net_device *orig_dev)
1749 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
1751 atomic_inc(&skb->users);
1752 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1755 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1757 if (!ptype->af_packet_priv || !skb->sk)
1760 if (ptype->id_match)
1761 return ptype->id_match(ptype, skb->sk);
1762 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1769 * Support routine. Sends outgoing frames to any network
1770 * taps currently in use.
1773 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1775 struct packet_type *ptype;
1776 struct sk_buff *skb2 = NULL;
1777 struct packet_type *pt_prev = NULL;
1780 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1781 /* Never send packets back to the socket
1782 * they originated from - MvS (miquels@drinkel.ow.org)
1784 if ((ptype->dev == dev || !ptype->dev) &&
1785 (!skb_loop_sk(ptype, skb))) {
1787 deliver_skb(skb2, pt_prev, skb->dev);
1792 skb2 = skb_clone(skb, GFP_ATOMIC);
1796 net_timestamp_set(skb2);
1798 /* skb->nh should be correctly
1799 set by sender, so that the second statement is
1800 just protection against buggy protocols.
1802 skb_reset_mac_header(skb2);
1804 if (skb_network_header(skb2) < skb2->data ||
1805 skb2->network_header > skb2->tail) {
1806 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1807 ntohs(skb2->protocol),
1809 skb_reset_network_header(skb2);
1812 skb2->transport_header = skb2->network_header;
1813 skb2->pkt_type = PACKET_OUTGOING;
1818 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1823 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1824 * @dev: Network device
1825 * @txq: number of queues available
1827 * If real_num_tx_queues is changed the tc mappings may no longer be
1828 * valid. To resolve this verify the tc mapping remains valid and if
1829 * not NULL the mapping. With no priorities mapping to this
1830 * offset/count pair it will no longer be used. In the worst case TC0
1831 * is invalid nothing can be done so disable priority mappings. If is
1832 * expected that drivers will fix this mapping if they can before
1833 * calling netif_set_real_num_tx_queues.
1835 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1838 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1840 /* If TC0 is invalidated disable TC mapping */
1841 if (tc->offset + tc->count > txq) {
1842 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1847 /* Invalidated prio to tc mappings set to TC0 */
1848 for (i = 1; i < TC_BITMASK + 1; i++) {
1849 int q = netdev_get_prio_tc_map(dev, i);
1851 tc = &dev->tc_to_txq[q];
1852 if (tc->offset + tc->count > txq) {
1853 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1855 netdev_set_prio_tc_map(dev, i, 0);
1861 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
1862 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
1864 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1868 if (txq < 1 || txq > dev->num_tx_queues)
1871 if (dev->reg_state == NETREG_REGISTERED ||
1872 dev->reg_state == NETREG_UNREGISTERING) {
1875 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
1881 netif_setup_tc(dev, txq);
1883 if (txq < dev->real_num_tx_queues)
1884 qdisc_reset_all_tx_gt(dev, txq);
1887 dev->real_num_tx_queues = txq;
1890 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1894 * netif_set_real_num_rx_queues - set actual number of RX queues used
1895 * @dev: Network device
1896 * @rxq: Actual number of RX queues
1898 * This must be called either with the rtnl_lock held or before
1899 * registration of the net device. Returns 0 on success, or a
1900 * negative error code. If called before registration, it always
1903 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
1907 if (rxq < 1 || rxq > dev->num_rx_queues)
1910 if (dev->reg_state == NETREG_REGISTERED) {
1913 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
1919 dev->real_num_rx_queues = rxq;
1922 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
1926 * netif_get_num_default_rss_queues - default number of RSS queues
1928 * This routine should set an upper limit on the number of RSS queues
1929 * used by default by multiqueue devices.
1931 int netif_get_num_default_rss_queues(void)
1933 return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
1935 EXPORT_SYMBOL(netif_get_num_default_rss_queues);
1937 static inline void __netif_reschedule(struct Qdisc *q)
1939 struct softnet_data *sd;
1940 unsigned long flags;
1942 local_irq_save(flags);
1943 sd = &__get_cpu_var(softnet_data);
1944 q->next_sched = NULL;
1945 *sd->output_queue_tailp = q;
1946 sd->output_queue_tailp = &q->next_sched;
1947 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1948 local_irq_restore(flags);
1951 void __netif_schedule(struct Qdisc *q)
1953 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1954 __netif_reschedule(q);
1956 EXPORT_SYMBOL(__netif_schedule);
1958 void dev_kfree_skb_irq(struct sk_buff *skb)
1960 if (atomic_dec_and_test(&skb->users)) {
1961 struct softnet_data *sd;
1962 unsigned long flags;
1964 local_irq_save(flags);
1965 sd = &__get_cpu_var(softnet_data);
1966 skb->next = sd->completion_queue;
1967 sd->completion_queue = skb;
1968 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1969 local_irq_restore(flags);
1972 EXPORT_SYMBOL(dev_kfree_skb_irq);
1974 void dev_kfree_skb_any(struct sk_buff *skb)
1976 if (in_irq() || irqs_disabled())
1977 dev_kfree_skb_irq(skb);
1981 EXPORT_SYMBOL(dev_kfree_skb_any);
1985 * netif_device_detach - mark device as removed
1986 * @dev: network device
1988 * Mark device as removed from system and therefore no longer available.
1990 void netif_device_detach(struct net_device *dev)
1992 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1993 netif_running(dev)) {
1994 netif_tx_stop_all_queues(dev);
1997 EXPORT_SYMBOL(netif_device_detach);
2000 * netif_device_attach - mark device as attached
2001 * @dev: network device
2003 * Mark device as attached from system and restart if needed.
2005 void netif_device_attach(struct net_device *dev)
2007 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
2008 netif_running(dev)) {
2009 netif_tx_wake_all_queues(dev);
2010 __netdev_watchdog_up(dev);
2013 EXPORT_SYMBOL(netif_device_attach);
2015 static void skb_warn_bad_offload(const struct sk_buff *skb)
2017 static const netdev_features_t null_features = 0;
2018 struct net_device *dev = skb->dev;
2019 const char *driver = "";
2021 if (dev && dev->dev.parent)
2022 driver = dev_driver_string(dev->dev.parent);
2024 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2025 "gso_type=%d ip_summed=%d\n",
2026 driver, dev ? &dev->features : &null_features,
2027 skb->sk ? &skb->sk->sk_route_caps : &null_features,
2028 skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
2029 skb_shinfo(skb)->gso_type, skb->ip_summed);
2033 * Invalidate hardware checksum when packet is to be mangled, and
2034 * complete checksum manually on outgoing path.
2036 int skb_checksum_help(struct sk_buff *skb)
2039 int ret = 0, offset;
2041 if (skb->ip_summed == CHECKSUM_COMPLETE)
2042 goto out_set_summed;
2044 if (unlikely(skb_shinfo(skb)->gso_size)) {
2045 skb_warn_bad_offload(skb);
2049 offset = skb_checksum_start_offset(skb);
2050 BUG_ON(offset >= skb_headlen(skb));
2051 csum = skb_checksum(skb, offset, skb->len - offset, 0);
2053 offset += skb->csum_offset;
2054 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
2056 if (skb_cloned(skb) &&
2057 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
2058 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
2063 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
2065 skb->ip_summed = CHECKSUM_NONE;
2069 EXPORT_SYMBOL(skb_checksum_help);
2072 * skb_gso_segment - Perform segmentation on skb.
2073 * @skb: buffer to segment
2074 * @features: features for the output path (see dev->features)
2076 * This function segments the given skb and returns a list of segments.
2078 * It may return NULL if the skb requires no segmentation. This is
2079 * only possible when GSO is used for verifying header integrity.
2081 struct sk_buff *skb_gso_segment(struct sk_buff *skb,
2082 netdev_features_t features)
2084 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
2085 struct packet_offload *ptype;
2086 __be16 type = skb->protocol;
2087 int vlan_depth = ETH_HLEN;
2090 while (type == htons(ETH_P_8021Q)) {
2091 struct vlan_hdr *vh;
2093 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
2094 return ERR_PTR(-EINVAL);
2096 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
2097 type = vh->h_vlan_encapsulated_proto;
2098 vlan_depth += VLAN_HLEN;
2101 skb_reset_mac_header(skb);
2102 skb->mac_len = skb->network_header - skb->mac_header;
2103 __skb_pull(skb, skb->mac_len);
2105 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
2106 skb_warn_bad_offload(skb);
2108 if (skb_header_cloned(skb) &&
2109 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
2110 return ERR_PTR(err);
2114 list_for_each_entry_rcu(ptype, &offload_base, list) {
2115 if (ptype->type == type && ptype->callbacks.gso_segment) {
2116 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
2117 err = ptype->callbacks.gso_send_check(skb);
2118 segs = ERR_PTR(err);
2119 if (err || skb_gso_ok(skb, features))
2121 __skb_push(skb, (skb->data -
2122 skb_network_header(skb)));
2124 segs = ptype->callbacks.gso_segment(skb, features);
2130 __skb_push(skb, skb->data - skb_mac_header(skb));
2134 EXPORT_SYMBOL(skb_gso_segment);
2136 /* Take action when hardware reception checksum errors are detected. */
2138 void netdev_rx_csum_fault(struct net_device *dev)
2140 if (net_ratelimit()) {
2141 pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
2145 EXPORT_SYMBOL(netdev_rx_csum_fault);
2148 /* Actually, we should eliminate this check as soon as we know, that:
2149 * 1. IOMMU is present and allows to map all the memory.
2150 * 2. No high memory really exists on this machine.
2153 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2155 #ifdef CONFIG_HIGHMEM
2157 if (!(dev->features & NETIF_F_HIGHDMA)) {
2158 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2159 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2160 if (PageHighMem(skb_frag_page(frag)))
2165 if (PCI_DMA_BUS_IS_PHYS) {
2166 struct device *pdev = dev->dev.parent;
2170 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2171 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2172 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2173 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2182 void (*destructor)(struct sk_buff *skb);
2185 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
2187 static void dev_gso_skb_destructor(struct sk_buff *skb)
2189 struct dev_gso_cb *cb;
2192 struct sk_buff *nskb = skb->next;
2194 skb->next = nskb->next;
2197 } while (skb->next);
2199 cb = DEV_GSO_CB(skb);
2201 cb->destructor(skb);
2205 * dev_gso_segment - Perform emulated hardware segmentation on skb.
2206 * @skb: buffer to segment
2207 * @features: device features as applicable to this skb
2209 * This function segments the given skb and stores the list of segments
2212 static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features)
2214 struct sk_buff *segs;
2216 segs = skb_gso_segment(skb, features);
2218 /* Verifying header integrity only. */
2223 return PTR_ERR(segs);
2226 DEV_GSO_CB(skb)->destructor = skb->destructor;
2227 skb->destructor = dev_gso_skb_destructor;
2232 static bool can_checksum_protocol(netdev_features_t features, __be16 protocol)
2234 return ((features & NETIF_F_GEN_CSUM) ||
2235 ((features & NETIF_F_V4_CSUM) &&
2236 protocol == htons(ETH_P_IP)) ||
2237 ((features & NETIF_F_V6_CSUM) &&
2238 protocol == htons(ETH_P_IPV6)) ||
2239 ((features & NETIF_F_FCOE_CRC) &&
2240 protocol == htons(ETH_P_FCOE)));
2243 static netdev_features_t harmonize_features(struct sk_buff *skb,
2244 __be16 protocol, netdev_features_t features)
2246 if (skb->ip_summed != CHECKSUM_NONE &&
2247 !can_checksum_protocol(features, protocol)) {
2248 features &= ~NETIF_F_ALL_CSUM;
2249 features &= ~NETIF_F_SG;
2250 } else if (illegal_highdma(skb->dev, skb)) {
2251 features &= ~NETIF_F_SG;
2257 netdev_features_t netif_skb_features(struct sk_buff *skb)
2259 __be16 protocol = skb->protocol;
2260 netdev_features_t features = skb->dev->features;
2262 if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
2263 features &= ~NETIF_F_GSO_MASK;
2265 if (protocol == htons(ETH_P_8021Q)) {
2266 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
2267 protocol = veh->h_vlan_encapsulated_proto;
2268 } else if (!vlan_tx_tag_present(skb)) {
2269 return harmonize_features(skb, protocol, features);
2272 features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2274 if (protocol != htons(ETH_P_8021Q)) {
2275 return harmonize_features(skb, protocol, features);
2277 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2278 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2279 return harmonize_features(skb, protocol, features);
2282 EXPORT_SYMBOL(netif_skb_features);
2285 * Returns true if either:
2286 * 1. skb has frag_list and the device doesn't support FRAGLIST, or
2287 * 2. skb is fragmented and the device does not support SG.
2289 static inline int skb_needs_linearize(struct sk_buff *skb,
2292 return skb_is_nonlinear(skb) &&
2293 ((skb_has_frag_list(skb) &&
2294 !(features & NETIF_F_FRAGLIST)) ||
2295 (skb_shinfo(skb)->nr_frags &&
2296 !(features & NETIF_F_SG)));
2299 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
2300 struct netdev_queue *txq)
2302 const struct net_device_ops *ops = dev->netdev_ops;
2303 int rc = NETDEV_TX_OK;
2304 unsigned int skb_len;
2306 if (likely(!skb->next)) {
2307 netdev_features_t features;
2310 * If device doesn't need skb->dst, release it right now while
2311 * its hot in this cpu cache
2313 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2316 features = netif_skb_features(skb);
2318 if (vlan_tx_tag_present(skb) &&
2319 !(features & NETIF_F_HW_VLAN_TX)) {
2320 skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
2327 /* If encapsulation offload request, verify we are testing
2328 * hardware encapsulation features instead of standard
2329 * features for the netdev
2331 if (skb->encapsulation)
2332 features &= dev->hw_enc_features;
2334 if (netif_needs_gso(skb, features)) {
2335 if (unlikely(dev_gso_segment(skb, features)))
2340 if (skb_needs_linearize(skb, features) &&
2341 __skb_linearize(skb))
2344 /* If packet is not checksummed and device does not
2345 * support checksumming for this protocol, complete
2346 * checksumming here.
2348 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2349 if (skb->encapsulation)
2350 skb_set_inner_transport_header(skb,
2351 skb_checksum_start_offset(skb));
2353 skb_set_transport_header(skb,
2354 skb_checksum_start_offset(skb));
2355 if (!(features & NETIF_F_ALL_CSUM) &&
2356 skb_checksum_help(skb))
2361 if (!list_empty(&ptype_all))
2362 dev_queue_xmit_nit(skb, dev);
2365 rc = ops->ndo_start_xmit(skb, dev);
2366 trace_net_dev_xmit(skb, rc, dev, skb_len);
2367 if (rc == NETDEV_TX_OK)
2368 txq_trans_update(txq);
2374 struct sk_buff *nskb = skb->next;
2376 skb->next = nskb->next;
2380 * If device doesn't need nskb->dst, release it right now while
2381 * its hot in this cpu cache
2383 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
2386 if (!list_empty(&ptype_all))
2387 dev_queue_xmit_nit(nskb, dev);
2389 skb_len = nskb->len;
2390 rc = ops->ndo_start_xmit(nskb, dev);
2391 trace_net_dev_xmit(nskb, rc, dev, skb_len);
2392 if (unlikely(rc != NETDEV_TX_OK)) {
2393 if (rc & ~NETDEV_TX_MASK)
2394 goto out_kfree_gso_skb;
2395 nskb->next = skb->next;
2399 txq_trans_update(txq);
2400 if (unlikely(netif_xmit_stopped(txq) && skb->next))
2401 return NETDEV_TX_BUSY;
2402 } while (skb->next);
2405 if (likely(skb->next == NULL))
2406 skb->destructor = DEV_GSO_CB(skb)->destructor;
2413 static u32 hashrnd __read_mostly;
2416 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2417 * to be used as a distribution range.
2419 u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
2420 unsigned int num_tx_queues)
2424 u16 qcount = num_tx_queues;
2426 if (skb_rx_queue_recorded(skb)) {
2427 hash = skb_get_rx_queue(skb);
2428 while (unlikely(hash >= num_tx_queues))
2429 hash -= num_tx_queues;
2434 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2435 qoffset = dev->tc_to_txq[tc].offset;
2436 qcount = dev->tc_to_txq[tc].count;
2439 if (skb->sk && skb->sk->sk_hash)
2440 hash = skb->sk->sk_hash;
2442 hash = (__force u16) skb->protocol;
2443 hash = jhash_1word(hash, hashrnd);
2445 return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2447 EXPORT_SYMBOL(__skb_tx_hash);
2449 static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
2451 if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2452 net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
2453 dev->name, queue_index,
2454 dev->real_num_tx_queues);
2460 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
2463 struct xps_dev_maps *dev_maps;
2464 struct xps_map *map;
2465 int queue_index = -1;
2468 dev_maps = rcu_dereference(dev->xps_maps);
2470 map = rcu_dereference(
2471 dev_maps->cpu_map[raw_smp_processor_id()]);
2474 queue_index = map->queues[0];
2477 if (skb->sk && skb->sk->sk_hash)
2478 hash = skb->sk->sk_hash;
2480 hash = (__force u16) skb->protocol ^
2482 hash = jhash_1word(hash, hashrnd);
2483 queue_index = map->queues[
2484 ((u64)hash * map->len) >> 32];
2486 if (unlikely(queue_index >= dev->real_num_tx_queues))
2498 struct netdev_queue *netdev_pick_tx(struct net_device *dev,
2499 struct sk_buff *skb)
2502 const struct net_device_ops *ops = dev->netdev_ops;
2504 if (dev->real_num_tx_queues == 1)
2506 else if (ops->ndo_select_queue) {
2507 queue_index = ops->ndo_select_queue(dev, skb);
2508 queue_index = dev_cap_txqueue(dev, queue_index);
2510 struct sock *sk = skb->sk;
2511 queue_index = sk_tx_queue_get(sk);
2513 if (queue_index < 0 || skb->ooo_okay ||
2514 queue_index >= dev->real_num_tx_queues) {
2515 int old_index = queue_index;
2517 queue_index = get_xps_queue(dev, skb);
2518 if (queue_index < 0)
2519 queue_index = skb_tx_hash(dev, skb);
2521 if (queue_index != old_index && sk) {
2522 struct dst_entry *dst =
2523 rcu_dereference_check(sk->sk_dst_cache, 1);
2525 if (dst && skb_dst(skb) == dst)
2526 sk_tx_queue_set(sk, queue_index);
2531 skb_set_queue_mapping(skb, queue_index);
2532 return netdev_get_tx_queue(dev, queue_index);
2535 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
2536 struct net_device *dev,
2537 struct netdev_queue *txq)
2539 spinlock_t *root_lock = qdisc_lock(q);
2543 qdisc_skb_cb(skb)->pkt_len = skb->len;
2544 qdisc_calculate_pkt_len(skb, q);
2546 * Heuristic to force contended enqueues to serialize on a
2547 * separate lock before trying to get qdisc main lock.
2548 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
2549 * and dequeue packets faster.
2551 contended = qdisc_is_running(q);
2552 if (unlikely(contended))
2553 spin_lock(&q->busylock);
2555 spin_lock(root_lock);
2556 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
2559 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
2560 qdisc_run_begin(q)) {
2562 * This is a work-conserving queue; there are no old skbs
2563 * waiting to be sent out; and the qdisc is not running -
2564 * xmit the skb directly.
2566 if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
2569 qdisc_bstats_update(q, skb);
2571 if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
2572 if (unlikely(contended)) {
2573 spin_unlock(&q->busylock);
2580 rc = NET_XMIT_SUCCESS;
2583 rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2584 if (qdisc_run_begin(q)) {
2585 if (unlikely(contended)) {
2586 spin_unlock(&q->busylock);
2592 spin_unlock(root_lock);
2593 if (unlikely(contended))
2594 spin_unlock(&q->busylock);
2598 #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
2599 static void skb_update_prio(struct sk_buff *skb)
2601 struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
2603 if (!skb->priority && skb->sk && map) {
2604 unsigned int prioidx = skb->sk->sk_cgrp_prioidx;
2606 if (prioidx < map->priomap_len)
2607 skb->priority = map->priomap[prioidx];
2611 #define skb_update_prio(skb)
2614 static DEFINE_PER_CPU(int, xmit_recursion);
2615 #define RECURSION_LIMIT 10
2618 * dev_loopback_xmit - loop back @skb
2619 * @skb: buffer to transmit
2621 int dev_loopback_xmit(struct sk_buff *skb)
2623 skb_reset_mac_header(skb);
2624 __skb_pull(skb, skb_network_offset(skb));
2625 skb->pkt_type = PACKET_LOOPBACK;
2626 skb->ip_summed = CHECKSUM_UNNECESSARY;
2627 WARN_ON(!skb_dst(skb));
2632 EXPORT_SYMBOL(dev_loopback_xmit);
2635 * dev_queue_xmit - transmit a buffer
2636 * @skb: buffer to transmit
2638 * Queue a buffer for transmission to a network device. The caller must
2639 * have set the device and priority and built the buffer before calling
2640 * this function. The function can be called from an interrupt.
2642 * A negative errno code is returned on a failure. A success does not
2643 * guarantee the frame will be transmitted as it may be dropped due
2644 * to congestion or traffic shaping.
2646 * -----------------------------------------------------------------------------------
2647 * I notice this method can also return errors from the queue disciplines,
2648 * including NET_XMIT_DROP, which is a positive value. So, errors can also
2651 * Regardless of the return value, the skb is consumed, so it is currently
2652 * difficult to retry a send to this method. (You can bump the ref count
2653 * before sending to hold a reference for retry if you are careful.)
2655 * When calling this method, interrupts MUST be enabled. This is because
2656 * the BH enable code must have IRQs enabled so that it will not deadlock.
2659 int dev_queue_xmit(struct sk_buff *skb)
2661 struct net_device *dev = skb->dev;
2662 struct netdev_queue *txq;
2666 /* Disable soft irqs for various locks below. Also
2667 * stops preemption for RCU.
2671 skb_update_prio(skb);
2673 txq = netdev_pick_tx(dev, skb);
2674 q = rcu_dereference_bh(txq->qdisc);
2676 #ifdef CONFIG_NET_CLS_ACT
2677 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
2679 trace_net_dev_queue(skb);
2681 rc = __dev_xmit_skb(skb, q, dev, txq);
2685 /* The device has no queue. Common case for software devices:
2686 loopback, all the sorts of tunnels...
2688 Really, it is unlikely that netif_tx_lock protection is necessary
2689 here. (f.e. loopback and IP tunnels are clean ignoring statistics
2691 However, it is possible, that they rely on protection
2694 Check this and shot the lock. It is not prone from deadlocks.
2695 Either shot noqueue qdisc, it is even simpler 8)
2697 if (dev->flags & IFF_UP) {
2698 int cpu = smp_processor_id(); /* ok because BHs are off */
2700 if (txq->xmit_lock_owner != cpu) {
2702 if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
2703 goto recursion_alert;
2705 HARD_TX_LOCK(dev, txq, cpu);
2707 if (!netif_xmit_stopped(txq)) {
2708 __this_cpu_inc(xmit_recursion);
2709 rc = dev_hard_start_xmit(skb, dev, txq);
2710 __this_cpu_dec(xmit_recursion);
2711 if (dev_xmit_complete(rc)) {
2712 HARD_TX_UNLOCK(dev, txq);
2716 HARD_TX_UNLOCK(dev, txq);
2717 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
2720 /* Recursion is detected! It is possible,
2724 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
2730 rcu_read_unlock_bh();
2735 rcu_read_unlock_bh();
2738 EXPORT_SYMBOL(dev_queue_xmit);
2741 /*=======================================================================
2743 =======================================================================*/
2745 int netdev_max_backlog __read_mostly = 1000;
2746 EXPORT_SYMBOL(netdev_max_backlog);
2748 int netdev_tstamp_prequeue __read_mostly = 1;
2749 int netdev_budget __read_mostly = 300;
2750 int weight_p __read_mostly = 64; /* old backlog weight */
2752 /* Called with irq disabled */
2753 static inline void ____napi_schedule(struct softnet_data *sd,
2754 struct napi_struct *napi)
2756 list_add_tail(&napi->poll_list, &sd->poll_list);
2757 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2761 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2762 * and src/dst port numbers. Sets rxhash in skb to non-zero hash value
2763 * on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
2764 * if hash is a canonical 4-tuple hash over transport ports.
2766 void __skb_get_rxhash(struct sk_buff *skb)
2768 struct flow_keys keys;
2771 if (!skb_flow_dissect(skb, &keys))
2777 /* get a consistent hash (same value on both flow directions) */
2778 if (((__force u32)keys.dst < (__force u32)keys.src) ||
2779 (((__force u32)keys.dst == (__force u32)keys.src) &&
2780 ((__force u16)keys.port16[1] < (__force u16)keys.port16[0]))) {
2781 swap(keys.dst, keys.src);
2782 swap(keys.port16[0], keys.port16[1]);
2785 hash = jhash_3words((__force u32)keys.dst,
2786 (__force u32)keys.src,
2787 (__force u32)keys.ports, hashrnd);
2793 EXPORT_SYMBOL(__skb_get_rxhash);
2797 /* One global table that all flow-based protocols share. */
2798 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2799 EXPORT_SYMBOL(rps_sock_flow_table);
2801 struct static_key rps_needed __read_mostly;
2803 static struct rps_dev_flow *
2804 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2805 struct rps_dev_flow *rflow, u16 next_cpu)
2807 if (next_cpu != RPS_NO_CPU) {
2808 #ifdef CONFIG_RFS_ACCEL
2809 struct netdev_rx_queue *rxqueue;
2810 struct rps_dev_flow_table *flow_table;
2811 struct rps_dev_flow *old_rflow;
2816 /* Should we steer this flow to a different hardware queue? */
2817 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
2818 !(dev->features & NETIF_F_NTUPLE))
2820 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
2821 if (rxq_index == skb_get_rx_queue(skb))
2824 rxqueue = dev->_rx + rxq_index;
2825 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2828 flow_id = skb->rxhash & flow_table->mask;
2829 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
2830 rxq_index, flow_id);
2834 rflow = &flow_table->flows[flow_id];
2836 if (old_rflow->filter == rflow->filter)
2837 old_rflow->filter = RPS_NO_FILTER;
2841 per_cpu(softnet_data, next_cpu).input_queue_head;
2844 rflow->cpu = next_cpu;
2849 * get_rps_cpu is called from netif_receive_skb and returns the target
2850 * CPU from the RPS map of the receiving queue for a given skb.
2851 * rcu_read_lock must be held on entry.
2853 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
2854 struct rps_dev_flow **rflowp)
2856 struct netdev_rx_queue *rxqueue;
2857 struct rps_map *map;
2858 struct rps_dev_flow_table *flow_table;
2859 struct rps_sock_flow_table *sock_flow_table;
2863 if (skb_rx_queue_recorded(skb)) {
2864 u16 index = skb_get_rx_queue(skb);
2865 if (unlikely(index >= dev->real_num_rx_queues)) {
2866 WARN_ONCE(dev->real_num_rx_queues > 1,
2867 "%s received packet on queue %u, but number "
2868 "of RX queues is %u\n",
2869 dev->name, index, dev->real_num_rx_queues);
2872 rxqueue = dev->_rx + index;
2876 map = rcu_dereference(rxqueue->rps_map);
2878 if (map->len == 1 &&
2879 !rcu_access_pointer(rxqueue->rps_flow_table)) {
2880 tcpu = map->cpus[0];
2881 if (cpu_online(tcpu))
2885 } else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2889 skb_reset_network_header(skb);
2890 if (!skb_get_rxhash(skb))
2893 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2894 sock_flow_table = rcu_dereference(rps_sock_flow_table);
2895 if (flow_table && sock_flow_table) {
2897 struct rps_dev_flow *rflow;
2899 rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
2902 next_cpu = sock_flow_table->ents[skb->rxhash &
2903 sock_flow_table->mask];
2906 * If the desired CPU (where last recvmsg was done) is
2907 * different from current CPU (one in the rx-queue flow
2908 * table entry), switch if one of the following holds:
2909 * - Current CPU is unset (equal to RPS_NO_CPU).
2910 * - Current CPU is offline.
2911 * - The current CPU's queue tail has advanced beyond the
2912 * last packet that was enqueued using this table entry.
2913 * This guarantees that all previous packets for the flow
2914 * have been dequeued, thus preserving in order delivery.
2916 if (unlikely(tcpu != next_cpu) &&
2917 (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
2918 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
2919 rflow->last_qtail)) >= 0)) {
2921 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
2924 if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
2932 tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
2934 if (cpu_online(tcpu)) {
2944 #ifdef CONFIG_RFS_ACCEL
2947 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
2948 * @dev: Device on which the filter was set
2949 * @rxq_index: RX queue index
2950 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
2951 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
2953 * Drivers that implement ndo_rx_flow_steer() should periodically call
2954 * this function for each installed filter and remove the filters for
2955 * which it returns %true.
2957 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
2958 u32 flow_id, u16 filter_id)
2960 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
2961 struct rps_dev_flow_table *flow_table;
2962 struct rps_dev_flow *rflow;
2967 flow_table = rcu_dereference(rxqueue->rps_flow_table);
2968 if (flow_table && flow_id <= flow_table->mask) {
2969 rflow = &flow_table->flows[flow_id];
2970 cpu = ACCESS_ONCE(rflow->cpu);
2971 if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
2972 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
2973 rflow->last_qtail) <
2974 (int)(10 * flow_table->mask)))
2980 EXPORT_SYMBOL(rps_may_expire_flow);
2982 #endif /* CONFIG_RFS_ACCEL */
2984 /* Called from hardirq (IPI) context */
2985 static void rps_trigger_softirq(void *data)
2987 struct softnet_data *sd = data;
2989 ____napi_schedule(sd, &sd->backlog);
2993 #endif /* CONFIG_RPS */
2996 * Check if this softnet_data structure is another cpu one
2997 * If yes, queue it to our IPI list and return 1
3000 static int rps_ipi_queued(struct softnet_data *sd)
3003 struct softnet_data *mysd = &__get_cpu_var(softnet_data);
3006 sd->rps_ipi_next = mysd->rps_ipi_list;
3007 mysd->rps_ipi_list = sd;
3009 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3012 #endif /* CONFIG_RPS */
3017 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3018 * queue (may be a remote CPU queue).
3020 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
3021 unsigned int *qtail)
3023 struct softnet_data *sd;
3024 unsigned long flags;
3026 sd = &per_cpu(softnet_data, cpu);
3028 local_irq_save(flags);
3031 if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
3032 if (skb_queue_len(&sd->input_pkt_queue)) {
3034 __skb_queue_tail(&sd->input_pkt_queue, skb);
3035 input_queue_tail_incr_save(sd, qtail);
3037 local_irq_restore(flags);
3038 return NET_RX_SUCCESS;
3041 /* Schedule NAPI for backlog device
3042 * We can use non atomic operation since we own the queue lock
3044 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
3045 if (!rps_ipi_queued(sd))
3046 ____napi_schedule(sd, &sd->backlog);
3054 local_irq_restore(flags);
3056 atomic_long_inc(&skb->dev->rx_dropped);
3062 * netif_rx - post buffer to the network code
3063 * @skb: buffer to post
3065 * This function receives a packet from a device driver and queues it for
3066 * the upper (protocol) levels to process. It always succeeds. The buffer
3067 * may be dropped during processing for congestion control or by the
3071 * NET_RX_SUCCESS (no congestion)
3072 * NET_RX_DROP (packet was dropped)
3076 int netif_rx(struct sk_buff *skb)
3080 /* if netpoll wants it, pretend we never saw it */
3081 if (netpoll_rx(skb))
3084 net_timestamp_check(netdev_tstamp_prequeue, skb);
3086 trace_netif_rx(skb);
3088 if (static_key_false(&rps_needed)) {
3089 struct rps_dev_flow voidflow, *rflow = &voidflow;
3095 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3097 cpu = smp_processor_id();
3099 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3107 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3112 EXPORT_SYMBOL(netif_rx);
3114 int netif_rx_ni(struct sk_buff *skb)
3119 err = netif_rx(skb);
3120 if (local_softirq_pending())
3126 EXPORT_SYMBOL(netif_rx_ni);
3128 static void net_tx_action(struct softirq_action *h)
3130 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3132 if (sd->completion_queue) {
3133 struct sk_buff *clist;
3135 local_irq_disable();
3136 clist = sd->completion_queue;
3137 sd->completion_queue = NULL;
3141 struct sk_buff *skb = clist;
3142 clist = clist->next;
3144 WARN_ON(atomic_read(&skb->users));
3145 trace_kfree_skb(skb, net_tx_action);
3150 if (sd->output_queue) {
3153 local_irq_disable();
3154 head = sd->output_queue;
3155 sd->output_queue = NULL;
3156 sd->output_queue_tailp = &sd->output_queue;
3160 struct Qdisc *q = head;
3161 spinlock_t *root_lock;
3163 head = head->next_sched;
3165 root_lock = qdisc_lock(q);
3166 if (spin_trylock(root_lock)) {
3167 smp_mb__before_clear_bit();
3168 clear_bit(__QDISC_STATE_SCHED,
3171 spin_unlock(root_lock);
3173 if (!test_bit(__QDISC_STATE_DEACTIVATED,
3175 __netif_reschedule(q);
3177 smp_mb__before_clear_bit();
3178 clear_bit(__QDISC_STATE_SCHED,
3186 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3187 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3188 /* This hook is defined here for ATM LANE */
3189 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3190 unsigned char *addr) __read_mostly;
3191 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3194 #ifdef CONFIG_NET_CLS_ACT
3195 /* TODO: Maybe we should just force sch_ingress to be compiled in
3196 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
3197 * a compare and 2 stores extra right now if we dont have it on
3198 * but have CONFIG_NET_CLS_ACT
3199 * NOTE: This doesn't stop any functionality; if you dont have
3200 * the ingress scheduler, you just can't add policies on ingress.
3203 static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
3205 struct net_device *dev = skb->dev;
3206 u32 ttl = G_TC_RTTL(skb->tc_verd);
3207 int result = TC_ACT_OK;
3210 if (unlikely(MAX_RED_LOOP < ttl++)) {
3211 net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
3212 skb->skb_iif, dev->ifindex);
3216 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
3217 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3220 if (q != &noop_qdisc) {
3221 spin_lock(qdisc_lock(q));
3222 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
3223 result = qdisc_enqueue_root(skb, q);
3224 spin_unlock(qdisc_lock(q));
3230 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
3231 struct packet_type **pt_prev,
3232 int *ret, struct net_device *orig_dev)
3234 struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
3236 if (!rxq || rxq->qdisc == &noop_qdisc)
3240 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3244 switch (ing_filter(skb, rxq)) {
3258 * netdev_rx_handler_register - register receive handler
3259 * @dev: device to register a handler for
3260 * @rx_handler: receive handler to register
3261 * @rx_handler_data: data pointer that is used by rx handler
3263 * Register a receive hander for a device. This handler will then be
3264 * called from __netif_receive_skb. A negative errno code is returned
3267 * The caller must hold the rtnl_mutex.
3269 * For a general description of rx_handler, see enum rx_handler_result.
3271 int netdev_rx_handler_register(struct net_device *dev,
3272 rx_handler_func_t *rx_handler,
3273 void *rx_handler_data)
3277 if (dev->rx_handler)
3280 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3281 rcu_assign_pointer(dev->rx_handler, rx_handler);
3285 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3288 * netdev_rx_handler_unregister - unregister receive handler
3289 * @dev: device to unregister a handler from
3291 * Unregister a receive hander from a device.
3293 * The caller must hold the rtnl_mutex.
3295 void netdev_rx_handler_unregister(struct net_device *dev)
3299 RCU_INIT_POINTER(dev->rx_handler, NULL);
3300 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3302 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
3305 * Limit the use of PFMEMALLOC reserves to those protocols that implement
3306 * the special handling of PFMEMALLOC skbs.
3308 static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
3310 switch (skb->protocol) {
3311 case __constant_htons(ETH_P_ARP):
3312 case __constant_htons(ETH_P_IP):
3313 case __constant_htons(ETH_P_IPV6):
3314 case __constant_htons(ETH_P_8021Q):
3321 static int __netif_receive_skb(struct sk_buff *skb)
3323 struct packet_type *ptype, *pt_prev;
3324 rx_handler_func_t *rx_handler;
3325 struct net_device *orig_dev;
3326 struct net_device *null_or_dev;
3327 bool deliver_exact = false;
3328 int ret = NET_RX_DROP;
3330 unsigned long pflags = current->flags;
3332 net_timestamp_check(!netdev_tstamp_prequeue, skb);
3334 trace_netif_receive_skb(skb);
3337 * PFMEMALLOC skbs are special, they should
3338 * - be delivered to SOCK_MEMALLOC sockets only
3339 * - stay away from userspace
3340 * - have bounded memory usage
3342 * Use PF_MEMALLOC as this saves us from propagating the allocation
3343 * context down to all allocation sites.
3345 if (sk_memalloc_socks() && skb_pfmemalloc(skb))
3346 current->flags |= PF_MEMALLOC;
3348 /* if we've gotten here through NAPI, check netpoll */
3349 if (netpoll_receive_skb(skb))
3352 orig_dev = skb->dev;
3354 skb_reset_network_header(skb);
3355 if (!skb_transport_header_was_set(skb))
3356 skb_reset_transport_header(skb);
3357 skb_reset_mac_len(skb);
3364 skb->skb_iif = skb->dev->ifindex;
3366 __this_cpu_inc(softnet_data.processed);
3368 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
3369 skb = vlan_untag(skb);
3374 #ifdef CONFIG_NET_CLS_ACT
3375 if (skb->tc_verd & TC_NCLS) {
3376 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
3381 if (sk_memalloc_socks() && skb_pfmemalloc(skb))
3384 list_for_each_entry_rcu(ptype, &ptype_all, list) {
3385 if (!ptype->dev || ptype->dev == skb->dev) {
3387 ret = deliver_skb(skb, pt_prev, orig_dev);
3393 #ifdef CONFIG_NET_CLS_ACT
3394 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
3400 if (sk_memalloc_socks() && skb_pfmemalloc(skb)
3401 && !skb_pfmemalloc_protocol(skb))
3404 if (vlan_tx_tag_present(skb)) {
3406 ret = deliver_skb(skb, pt_prev, orig_dev);
3409 if (vlan_do_receive(&skb))
3411 else if (unlikely(!skb))
3415 rx_handler = rcu_dereference(skb->dev->rx_handler);
3418 ret = deliver_skb(skb, pt_prev, orig_dev);
3421 switch (rx_handler(&skb)) {
3422 case RX_HANDLER_CONSUMED:
3424 case RX_HANDLER_ANOTHER:
3426 case RX_HANDLER_EXACT:
3427 deliver_exact = true;
3428 case RX_HANDLER_PASS:
3435 if (vlan_tx_nonzero_tag_present(skb))
3436 skb->pkt_type = PACKET_OTHERHOST;
3438 /* deliver only exact match when indicated */
3439 null_or_dev = deliver_exact ? skb->dev : NULL;
3441 type = skb->protocol;
3442 list_for_each_entry_rcu(ptype,
3443 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3444 if (ptype->type == type &&
3445 (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
3446 ptype->dev == orig_dev)) {
3448 ret = deliver_skb(skb, pt_prev, orig_dev);
3454 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
3457 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
3460 atomic_long_inc(&skb->dev->rx_dropped);
3462 /* Jamal, now you will not able to escape explaining
3463 * me how you were going to use this. :-)
3471 tsk_restore_flags(current, pflags, PF_MEMALLOC);
3476 * netif_receive_skb - process receive buffer from network
3477 * @skb: buffer to process
3479 * netif_receive_skb() is the main receive data processing function.
3480 * It always succeeds. The buffer may be dropped during processing
3481 * for congestion control or by the protocol layers.
3483 * This function may only be called from softirq context and interrupts
3484 * should be enabled.
3486 * Return values (usually ignored):
3487 * NET_RX_SUCCESS: no congestion
3488 * NET_RX_DROP: packet was dropped
3490 int netif_receive_skb(struct sk_buff *skb)
3492 net_timestamp_check(netdev_tstamp_prequeue, skb);
3494 if (skb_defer_rx_timestamp(skb))
3495 return NET_RX_SUCCESS;
3498 if (static_key_false(&rps_needed)) {
3499 struct rps_dev_flow voidflow, *rflow = &voidflow;
3504 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3507 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3514 return __netif_receive_skb(skb);
3516 EXPORT_SYMBOL(netif_receive_skb);
3518 /* Network device is going away, flush any packets still pending
3519 * Called with irqs disabled.
3521 static void flush_backlog(void *arg)
3523 struct net_device *dev = arg;
3524 struct softnet_data *sd = &__get_cpu_var(softnet_data);
3525 struct sk_buff *skb, *tmp;
3528 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3529 if (skb->dev == dev) {
3530 __skb_unlink(skb, &sd->input_pkt_queue);
3532 input_queue_head_incr(sd);
3537 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
3538 if (skb->dev == dev) {
3539 __skb_unlink(skb, &sd->process_queue);
3541 input_queue_head_incr(sd);
3546 static int napi_gro_complete(struct sk_buff *skb)
3548 struct packet_offload *ptype;
3549 __be16 type = skb->protocol;
3550 struct list_head *head = &offload_base;
3553 BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
3555 if (NAPI_GRO_CB(skb)->count == 1) {
3556 skb_shinfo(skb)->gso_size = 0;
3561 list_for_each_entry_rcu(ptype, head, list) {
3562 if (ptype->type != type || !ptype->callbacks.gro_complete)
3565 err = ptype->callbacks.gro_complete(skb);
3571 WARN_ON(&ptype->list == head);
3573 return NET_RX_SUCCESS;
3577 return netif_receive_skb(skb);
3580 /* napi->gro_list contains packets ordered by age.
3581 * youngest packets at the head of it.
3582 * Complete skbs in reverse order to reduce latencies.
3584 void napi_gro_flush(struct napi_struct *napi, bool flush_old)
3586 struct sk_buff *skb, *prev = NULL;
3588 /* scan list and build reverse chain */
3589 for (skb = napi->gro_list; skb != NULL; skb = skb->next) {
3594 for (skb = prev; skb; skb = prev) {
3597 if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
3601 napi_gro_complete(skb);
3605 napi->gro_list = NULL;
3607 EXPORT_SYMBOL(napi_gro_flush);
3609 static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb)
3612 unsigned int maclen = skb->dev->hard_header_len;
3614 for (p = napi->gro_list; p; p = p->next) {
3615 unsigned long diffs;
3617 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3618 diffs |= p->vlan_tci ^ skb->vlan_tci;
3619 if (maclen == ETH_HLEN)
3620 diffs |= compare_ether_header(skb_mac_header(p),
3621 skb_gro_mac_header(skb));
3623 diffs = memcmp(skb_mac_header(p),
3624 skb_gro_mac_header(skb),
3626 NAPI_GRO_CB(p)->same_flow = !diffs;
3627 NAPI_GRO_CB(p)->flush = 0;
3631 static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3633 struct sk_buff **pp = NULL;
3634 struct packet_offload *ptype;
3635 __be16 type = skb->protocol;
3636 struct list_head *head = &offload_base;
3639 enum gro_result ret;
3641 if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3644 if (skb_is_gso(skb) || skb_has_frag_list(skb))
3647 gro_list_prepare(napi, skb);
3650 list_for_each_entry_rcu(ptype, head, list) {
3651 if (ptype->type != type || !ptype->callbacks.gro_receive)
3654 skb_set_network_header(skb, skb_gro_offset(skb));
3655 mac_len = skb->network_header - skb->mac_header;
3656 skb->mac_len = mac_len;
3657 NAPI_GRO_CB(skb)->same_flow = 0;
3658 NAPI_GRO_CB(skb)->flush = 0;
3659 NAPI_GRO_CB(skb)->free = 0;
3661 pp = ptype->callbacks.gro_receive(&napi->gro_list, skb);
3666 if (&ptype->list == head)
3669 same_flow = NAPI_GRO_CB(skb)->same_flow;
3670 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
3673 struct sk_buff *nskb = *pp;
3677 napi_gro_complete(nskb);
3684 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3688 NAPI_GRO_CB(skb)->count = 1;
3689 NAPI_GRO_CB(skb)->age = jiffies;
3690 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3691 skb->next = napi->gro_list;
3692 napi->gro_list = skb;
3696 if (skb_headlen(skb) < skb_gro_offset(skb)) {
3697 int grow = skb_gro_offset(skb) - skb_headlen(skb);
3699 BUG_ON(skb->end - skb->tail < grow);
3701 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
3704 skb->data_len -= grow;
3706 skb_shinfo(skb)->frags[0].page_offset += grow;
3707 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
3709 if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3710 skb_frag_unref(skb, 0);
3711 memmove(skb_shinfo(skb)->frags,
3712 skb_shinfo(skb)->frags + 1,
3713 --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
3726 static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
3730 if (netif_receive_skb(skb))
3738 case GRO_MERGED_FREE:
3739 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
3740 kmem_cache_free(skbuff_head_cache, skb);
3753 static void skb_gro_reset_offset(struct sk_buff *skb)
3755 const struct skb_shared_info *pinfo = skb_shinfo(skb);
3756 const skb_frag_t *frag0 = &pinfo->frags[0];
3758 NAPI_GRO_CB(skb)->data_offset = 0;
3759 NAPI_GRO_CB(skb)->frag0 = NULL;
3760 NAPI_GRO_CB(skb)->frag0_len = 0;
3762 if (skb->mac_header == skb->tail &&
3764 !PageHighMem(skb_frag_page(frag0))) {
3765 NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
3766 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0);
3770 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3772 skb_gro_reset_offset(skb);
3774 return napi_skb_finish(dev_gro_receive(napi, skb), skb);
3776 EXPORT_SYMBOL(napi_gro_receive);
3778 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3780 __skb_pull(skb, skb_headlen(skb));
3781 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
3782 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
3784 skb->dev = napi->dev;
3790 struct sk_buff *napi_get_frags(struct napi_struct *napi)
3792 struct sk_buff *skb = napi->skb;
3795 skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
3801 EXPORT_SYMBOL(napi_get_frags);
3803 static gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
3809 skb->protocol = eth_type_trans(skb, skb->dev);
3811 if (ret == GRO_HELD)
3812 skb_gro_pull(skb, -ETH_HLEN);
3813 else if (netif_receive_skb(skb))
3818 case GRO_MERGED_FREE:
3819 napi_reuse_skb(napi, skb);
3829 static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3831 struct sk_buff *skb = napi->skb;
3838 skb_reset_mac_header(skb);
3839 skb_gro_reset_offset(skb);
3841 off = skb_gro_offset(skb);
3842 hlen = off + sizeof(*eth);
3843 eth = skb_gro_header_fast(skb, off);
3844 if (skb_gro_header_hard(skb, hlen)) {
3845 eth = skb_gro_header_slow(skb, hlen, off);
3846 if (unlikely(!eth)) {
3847 napi_reuse_skb(napi, skb);
3853 skb_gro_pull(skb, sizeof(*eth));
3856 * This works because the only protocols we care about don't require
3857 * special handling. We'll fix it up properly at the end.
3859 skb->protocol = eth->h_proto;
3865 gro_result_t napi_gro_frags(struct napi_struct *napi)
3867 struct sk_buff *skb = napi_frags_skb(napi);
3872 return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
3874 EXPORT_SYMBOL(napi_gro_frags);
3877 * net_rps_action sends any pending IPI's for rps.
3878 * Note: called with local irq disabled, but exits with local irq enabled.
3880 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
3883 struct softnet_data *remsd = sd->rps_ipi_list;
3886 sd->rps_ipi_list = NULL;
3890 /* Send pending IPI's to kick RPS processing on remote cpus. */
3892 struct softnet_data *next = remsd->rps_ipi_next;
3894 if (cpu_online(remsd->cpu))
3895 __smp_call_function_single(remsd->cpu,
3904 static int process_backlog(struct napi_struct *napi, int quota)
3907 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
3910 /* Check if we have pending ipi, its better to send them now,
3911 * not waiting net_rx_action() end.
3913 if (sd->rps_ipi_list) {
3914 local_irq_disable();
3915 net_rps_action_and_irq_enable(sd);
3918 napi->weight = weight_p;
3919 local_irq_disable();
3920 while (work < quota) {
3921 struct sk_buff *skb;
3924 while ((skb = __skb_dequeue(&sd->process_queue))) {
3926 __netif_receive_skb(skb);
3927 local_irq_disable();
3928 input_queue_head_incr(sd);
3929 if (++work >= quota) {
3936 qlen = skb_queue_len(&sd->input_pkt_queue);
3938 skb_queue_splice_tail_init(&sd->input_pkt_queue,
3939 &sd->process_queue);
3941 if (qlen < quota - work) {
3943 * Inline a custom version of __napi_complete().
3944 * only current cpu owns and manipulates this napi,
3945 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
3946 * we can use a plain write instead of clear_bit(),
3947 * and we dont need an smp_mb() memory barrier.
3949 list_del(&napi->poll_list);
3952 quota = work + qlen;
3962 * __napi_schedule - schedule for receive
3963 * @n: entry to schedule
3965 * The entry's receive function will be scheduled to run
3967 void __napi_schedule(struct napi_struct *n)
3969 unsigned long flags;
3971 local_irq_save(flags);
3972 ____napi_schedule(&__get_cpu_var(softnet_data), n);
3973 local_irq_restore(flags);
3975 EXPORT_SYMBOL(__napi_schedule);
3977 void __napi_complete(struct napi_struct *n)
3979 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
3980 BUG_ON(n->gro_list);
3982 list_del(&n->poll_list);
3983 smp_mb__before_clear_bit();
3984 clear_bit(NAPI_STATE_SCHED, &n->state);
3986 EXPORT_SYMBOL(__napi_complete);
3988 void napi_complete(struct napi_struct *n)
3990 unsigned long flags;
3993 * don't let napi dequeue from the cpu poll list
3994 * just in case its running on a different cpu
3996 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
3999 napi_gro_flush(n, false);
4000 local_irq_save(flags);
4002 local_irq_restore(flags);
4004 EXPORT_SYMBOL(napi_complete);
4006 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
4007 int (*poll)(struct napi_struct *, int), int weight)
4009 INIT_LIST_HEAD(&napi->poll_list);
4010 napi->gro_count = 0;
4011 napi->gro_list = NULL;
4014 napi->weight = weight;
4015 list_add(&napi->dev_list, &dev->napi_list);
4017 #ifdef CONFIG_NETPOLL
4018 spin_lock_init(&napi->poll_lock);
4019 napi->poll_owner = -1;
4021 set_bit(NAPI_STATE_SCHED, &napi->state);
4023 EXPORT_SYMBOL(netif_napi_add);
4025 void netif_napi_del(struct napi_struct *napi)
4027 struct sk_buff *skb, *next;
4029 list_del_init(&napi->dev_list);
4030 napi_free_frags(napi);
4032 for (skb = napi->gro_list; skb; skb = next) {
4038 napi->gro_list = NULL;
4039 napi->gro_count = 0;
4041 EXPORT_SYMBOL(netif_napi_del);
4043 static void net_rx_action(struct softirq_action *h)
4045 struct softnet_data *sd = &__get_cpu_var(softnet_data);
4046 unsigned long time_limit = jiffies + 2;
4047 int budget = netdev_budget;
4050 local_irq_disable();
4052 while (!list_empty(&sd->poll_list)) {
4053 struct napi_struct *n;
4056 /* If softirq window is exhuasted then punt.
4057 * Allow this to run for 2 jiffies since which will allow
4058 * an average latency of 1.5/HZ.
4060 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
4065 /* Even though interrupts have been re-enabled, this
4066 * access is safe because interrupts can only add new
4067 * entries to the tail of this list, and only ->poll()
4068 * calls can remove this head entry from the list.
4070 n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
4072 have = netpoll_poll_lock(n);
4076 /* This NAPI_STATE_SCHED test is for avoiding a race
4077 * with netpoll's poll_napi(). Only the entity which
4078 * obtains the lock and sees NAPI_STATE_SCHED set will
4079 * actually make the ->poll() call. Therefore we avoid
4080 * accidentally calling ->poll() when NAPI is not scheduled.
4083 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
4084 work = n->poll(n, weight);
4088 WARN_ON_ONCE(work > weight);
4092 local_irq_disable();
4094 /* Drivers must not modify the NAPI state if they
4095 * consume the entire weight. In such cases this code
4096 * still "owns" the NAPI instance and therefore can
4097 * move the instance around on the list at-will.
4099 if (unlikely(work == weight)) {
4100 if (unlikely(napi_disable_pending(n))) {
4103 local_irq_disable();
4106 /* flush too old packets
4107 * If HZ < 1000, flush all packets.
4110 napi_gro_flush(n, HZ >= 1000);
4111 local_irq_disable();
4113 list_move_tail(&n->poll_list, &sd->poll_list);
4117 netpoll_poll_unlock(have);
4120 net_rps_action_and_irq_enable(sd);
4122 #ifdef CONFIG_NET_DMA
4124 * There may not be any more sk_buffs coming right now, so push
4125 * any pending DMA copies to hardware
4127 dma_issue_pending_all();
4134 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
4138 static gifconf_func_t *gifconf_list[NPROTO];
4141 * register_gifconf - register a SIOCGIF handler
4142 * @family: Address family
4143 * @gifconf: Function handler
4145 * Register protocol dependent address dumping routines. The handler
4146 * that is passed must not be freed or reused until it has been replaced
4147 * by another handler.
4149 int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
4151 if (family >= NPROTO)
4153 gifconf_list[family] = gifconf;
4156 EXPORT_SYMBOL(register_gifconf);
4160 * Map an interface index to its name (SIOCGIFNAME)
4164 * We need this ioctl for efficient implementation of the
4165 * if_indextoname() function required by the IPv6 API. Without
4166 * it, we would have to search all the interfaces to find a
4170 static int dev_ifname(struct net *net, struct ifreq __user *arg)
4172 struct net_device *dev;
4177 * Fetch the caller's info block.
4180 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4184 seq = read_seqcount_begin(&devnet_rename_seq);
4186 dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
4192 strcpy(ifr.ifr_name, dev->name);
4194 if (read_seqcount_retry(&devnet_rename_seq, seq))
4197 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
4203 * Perform a SIOCGIFCONF call. This structure will change
4204 * size eventually, and there is nothing I can do about it.
4205 * Thus we will need a 'compatibility mode'.
4208 static int dev_ifconf(struct net *net, char __user *arg)
4211 struct net_device *dev;
4218 * Fetch the caller's info block.
4221 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
4228 * Loop over the interfaces, and write an info block for each.
4232 for_each_netdev(net, dev) {
4233 for (i = 0; i < NPROTO; i++) {
4234 if (gifconf_list[i]) {
4237 done = gifconf_list[i](dev, NULL, 0);
4239 done = gifconf_list[i](dev, pos + total,
4249 * All done. Write the updated control block back to the caller.
4251 ifc.ifc_len = total;
4254 * Both BSD and Solaris return 0 here, so we do too.
4256 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
4259 #ifdef CONFIG_PROC_FS
4261 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4263 #define get_bucket(x) ((x) >> BUCKET_SPACE)
4264 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
4265 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
4267 static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
4269 struct net *net = seq_file_net(seq);
4270 struct net_device *dev;
4271 struct hlist_node *p;
4272 struct hlist_head *h;
4273 unsigned int count = 0, offset = get_offset(*pos);
4275 h = &net->dev_name_head[get_bucket(*pos)];
4276 hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
4277 if (++count == offset)
4284 static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
4286 struct net_device *dev;
4287 unsigned int bucket;
4290 dev = dev_from_same_bucket(seq, pos);
4294 bucket = get_bucket(*pos) + 1;
4295 *pos = set_bucket_offset(bucket, 1);
4296 } while (bucket < NETDEV_HASHENTRIES);
4302 * This is invoked by the /proc filesystem handler to display a device
4305 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4310 return SEQ_START_TOKEN;
4312 if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
4315 return dev_from_bucket(seq, pos);
4318 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4321 return dev_from_bucket(seq, pos);
4324 void dev_seq_stop(struct seq_file *seq, void *v)
4330 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
4332 struct rtnl_link_stats64 temp;
4333 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
4335 seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
4336 "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4337 dev->name, stats->rx_bytes, stats->rx_packets,
4339 stats->rx_dropped + stats->rx_missed_errors,
4340 stats->rx_fifo_errors,
4341 stats->rx_length_errors + stats->rx_over_errors +
4342 stats->rx_crc_errors + stats->rx_frame_errors,
4343 stats->rx_compressed, stats->multicast,
4344 stats->tx_bytes, stats->tx_packets,
4345 stats->tx_errors, stats->tx_dropped,
4346 stats->tx_fifo_errors, stats->collisions,
4347 stats->tx_carrier_errors +
4348 stats->tx_aborted_errors +
4349 stats->tx_window_errors +
4350 stats->tx_heartbeat_errors,
4351 stats->tx_compressed);
4355 * Called from the PROCfs module. This now uses the new arbitrary sized
4356 * /proc/net interface to create /proc/net/dev
4358 static int dev_seq_show(struct seq_file *seq, void *v)
4360 if (v == SEQ_START_TOKEN)
4361 seq_puts(seq, "Inter-| Receive "
4363 " face |bytes packets errs drop fifo frame "
4364 "compressed multicast|bytes packets errs "
4365 "drop fifo colls carrier compressed\n");
4367 dev_seq_printf_stats(seq, v);
4371 static struct softnet_data *softnet_get_online(loff_t *pos)
4373 struct softnet_data *sd = NULL;
4375 while (*pos < nr_cpu_ids)
4376 if (cpu_online(*pos)) {
4377 sd = &per_cpu(softnet_data, *pos);
4384 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
4386 return softnet_get_online(pos);
4389 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4392 return softnet_get_online(pos);
4395 static void softnet_seq_stop(struct seq_file *seq, void *v)
4399 static int softnet_seq_show(struct seq_file *seq, void *v)
4401 struct softnet_data *sd = v;
4403 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
4404 sd->processed, sd->dropped, sd->time_squeeze, 0,
4405 0, 0, 0, 0, /* was fastroute */
4406 sd->cpu_collision, sd->received_rps);
4410 static const struct seq_operations dev_seq_ops = {
4411 .start = dev_seq_start,
4412 .next = dev_seq_next,
4413 .stop = dev_seq_stop,
4414 .show = dev_seq_show,
4417 static int dev_seq_open(struct inode *inode, struct file *file)
4419 return seq_open_net(inode, file, &dev_seq_ops,
4420 sizeof(struct seq_net_private));
4423 static const struct file_operations dev_seq_fops = {
4424 .owner = THIS_MODULE,
4425 .open = dev_seq_open,
4427 .llseek = seq_lseek,
4428 .release = seq_release_net,
4431 static const struct seq_operations softnet_seq_ops = {
4432 .start = softnet_seq_start,
4433 .next = softnet_seq_next,
4434 .stop = softnet_seq_stop,
4435 .show = softnet_seq_show,
4438 static int softnet_seq_open(struct inode *inode, struct file *file)
4440 return seq_open(file, &softnet_seq_ops);
4443 static const struct file_operations softnet_seq_fops = {
4444 .owner = THIS_MODULE,
4445 .open = softnet_seq_open,
4447 .llseek = seq_lseek,
4448 .release = seq_release,
4451 static void *ptype_get_idx(loff_t pos)
4453 struct packet_type *pt = NULL;
4457 list_for_each_entry_rcu(pt, &ptype_all, list) {
4463 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4464 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
4473 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
4477 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
4480 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4482 struct packet_type *pt;
4483 struct list_head *nxt;
4487 if (v == SEQ_START_TOKEN)
4488 return ptype_get_idx(0);
4491 nxt = pt->list.next;
4492 if (pt->type == htons(ETH_P_ALL)) {
4493 if (nxt != &ptype_all)
4496 nxt = ptype_base[0].next;
4498 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4500 while (nxt == &ptype_base[hash]) {
4501 if (++hash >= PTYPE_HASH_SIZE)
4503 nxt = ptype_base[hash].next;
4506 return list_entry(nxt, struct packet_type, list);
4509 static void ptype_seq_stop(struct seq_file *seq, void *v)
4515 static int ptype_seq_show(struct seq_file *seq, void *v)
4517 struct packet_type *pt = v;
4519 if (v == SEQ_START_TOKEN)
4520 seq_puts(seq, "Type Device Function\n");
4521 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4522 if (pt->type == htons(ETH_P_ALL))
4523 seq_puts(seq, "ALL ");
4525 seq_printf(seq, "%04x", ntohs(pt->type));
4527 seq_printf(seq, " %-8s %pF\n",
4528 pt->dev ? pt->dev->name : "", pt->func);
4534 static const struct seq_operations ptype_seq_ops = {
4535 .start = ptype_seq_start,
4536 .next = ptype_seq_next,
4537 .stop = ptype_seq_stop,
4538 .show = ptype_seq_show,
4541 static int ptype_seq_open(struct inode *inode, struct file *file)
4543 return seq_open_net(inode, file, &ptype_seq_ops,
4544 sizeof(struct seq_net_private));
4547 static const struct file_operations ptype_seq_fops = {
4548 .owner = THIS_MODULE,
4549 .open = ptype_seq_open,
4551 .llseek = seq_lseek,
4552 .release = seq_release_net,
4556 static int __net_init dev_proc_net_init(struct net *net)
4560 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
4562 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
4564 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4567 if (wext_proc_init(net))
4573 proc_net_remove(net, "ptype");
4575 proc_net_remove(net, "softnet_stat");
4577 proc_net_remove(net, "dev");
4581 static void __net_exit dev_proc_net_exit(struct net *net)
4583 wext_proc_exit(net);
4585 proc_net_remove(net, "ptype");
4586 proc_net_remove(net, "softnet_stat");
4587 proc_net_remove(net, "dev");
4590 static struct pernet_operations __net_initdata dev_proc_ops = {
4591 .init = dev_proc_net_init,
4592 .exit = dev_proc_net_exit,
4595 static int __init dev_proc_init(void)
4597 return register_pernet_subsys(&dev_proc_ops);
4600 #define dev_proc_init() 0
4601 #endif /* CONFIG_PROC_FS */
4604 struct netdev_upper {
4605 struct net_device *dev;
4607 struct list_head list;
4608 struct rcu_head rcu;
4609 struct list_head search_list;
4612 static void __append_search_uppers(struct list_head *search_list,
4613 struct net_device *dev)
4615 struct netdev_upper *upper;
4617 list_for_each_entry(upper, &dev->upper_dev_list, list) {
4618 /* check if this upper is not already in search list */
4619 if (list_empty(&upper->search_list))
4620 list_add_tail(&upper->search_list, search_list);
4624 static bool __netdev_search_upper_dev(struct net_device *dev,
4625 struct net_device *upper_dev)
4627 LIST_HEAD(search_list);
4628 struct netdev_upper *upper;
4629 struct netdev_upper *tmp;
4632 __append_search_uppers(&search_list, dev);
4633 list_for_each_entry(upper, &search_list, search_list) {
4634 if (upper->dev == upper_dev) {
4638 __append_search_uppers(&search_list, upper->dev);
4640 list_for_each_entry_safe(upper, tmp, &search_list, search_list)
4641 INIT_LIST_HEAD(&upper->search_list);
4645 static struct netdev_upper *__netdev_find_upper(struct net_device *dev,
4646 struct net_device *upper_dev)
4648 struct netdev_upper *upper;
4650 list_for_each_entry(upper, &dev->upper_dev_list, list) {
4651 if (upper->dev == upper_dev)
4658 * netdev_has_upper_dev - Check if device is linked to an upper device
4660 * @upper_dev: upper device to check
4662 * Find out if a device is linked to specified upper device and return true
4663 * in case it is. Note that this checks only immediate upper device,
4664 * not through a complete stack of devices. The caller must hold the RTNL lock.
4666 bool netdev_has_upper_dev(struct net_device *dev,
4667 struct net_device *upper_dev)
4671 return __netdev_find_upper(dev, upper_dev);
4673 EXPORT_SYMBOL(netdev_has_upper_dev);
4676 * netdev_has_any_upper_dev - Check if device is linked to some device
4679 * Find out if a device is linked to an upper device and return true in case
4680 * it is. The caller must hold the RTNL lock.
4682 bool netdev_has_any_upper_dev(struct net_device *dev)
4686 return !list_empty(&dev->upper_dev_list);
4688 EXPORT_SYMBOL(netdev_has_any_upper_dev);
4691 * netdev_master_upper_dev_get - Get master upper device
4694 * Find a master upper device and return pointer to it or NULL in case
4695 * it's not there. The caller must hold the RTNL lock.
4697 struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
4699 struct netdev_upper *upper;
4703 if (list_empty(&dev->upper_dev_list))
4706 upper = list_first_entry(&dev->upper_dev_list,
4707 struct netdev_upper, list);
4708 if (likely(upper->master))
4712 EXPORT_SYMBOL(netdev_master_upper_dev_get);
4715 * netdev_master_upper_dev_get_rcu - Get master upper device
4718 * Find a master upper device and return pointer to it or NULL in case
4719 * it's not there. The caller must hold the RCU read lock.
4721 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
4723 struct netdev_upper *upper;
4725 upper = list_first_or_null_rcu(&dev->upper_dev_list,
4726 struct netdev_upper, list);
4727 if (upper && likely(upper->master))
4731 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
4733 static int __netdev_upper_dev_link(struct net_device *dev,
4734 struct net_device *upper_dev, bool master)
4736 struct netdev_upper *upper;
4740 if (dev == upper_dev)
4743 /* To prevent loops, check if dev is not upper device to upper_dev. */
4744 if (__netdev_search_upper_dev(upper_dev, dev))
4747 if (__netdev_find_upper(dev, upper_dev))
4750 if (master && netdev_master_upper_dev_get(dev))
4753 upper = kmalloc(sizeof(*upper), GFP_KERNEL);
4757 upper->dev = upper_dev;
4758 upper->master = master;
4759 INIT_LIST_HEAD(&upper->search_list);
4761 /* Ensure that master upper link is always the first item in list. */
4763 list_add_rcu(&upper->list, &dev->upper_dev_list);
4765 list_add_tail_rcu(&upper->list, &dev->upper_dev_list);
4766 dev_hold(upper_dev);
4772 * netdev_upper_dev_link - Add a link to the upper device
4774 * @upper_dev: new upper device
4776 * Adds a link to device which is upper to this one. The caller must hold
4777 * the RTNL lock. On a failure a negative errno code is returned.
4778 * On success the reference counts are adjusted and the function
4781 int netdev_upper_dev_link(struct net_device *dev,
4782 struct net_device *upper_dev)
4784 return __netdev_upper_dev_link(dev, upper_dev, false);
4786 EXPORT_SYMBOL(netdev_upper_dev_link);
4789 * netdev_master_upper_dev_link - Add a master link to the upper device
4791 * @upper_dev: new upper device
4793 * Adds a link to device which is upper to this one. In this case, only
4794 * one master upper device can be linked, although other non-master devices
4795 * might be linked as well. The caller must hold the RTNL lock.
4796 * On a failure a negative errno code is returned. On success the reference
4797 * counts are adjusted and the function returns zero.
4799 int netdev_master_upper_dev_link(struct net_device *dev,
4800 struct net_device *upper_dev)
4802 return __netdev_upper_dev_link(dev, upper_dev, true);
4804 EXPORT_SYMBOL(netdev_master_upper_dev_link);
4807 * netdev_upper_dev_unlink - Removes a link to upper device
4809 * @upper_dev: new upper device
4811 * Removes a link to device which is upper to this one. The caller must hold
4814 void netdev_upper_dev_unlink(struct net_device *dev,
4815 struct net_device *upper_dev)
4817 struct netdev_upper *upper;
4821 upper = __netdev_find_upper(dev, upper_dev);
4824 list_del_rcu(&upper->list);
4826 kfree_rcu(upper, rcu);
4828 EXPORT_SYMBOL(netdev_upper_dev_unlink);
4830 static void dev_change_rx_flags(struct net_device *dev, int flags)
4832 const struct net_device_ops *ops = dev->netdev_ops;
4834 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
4835 ops->ndo_change_rx_flags(dev, flags);
4838 static int __dev_set_promiscuity(struct net_device *dev, int inc)
4840 unsigned int old_flags = dev->flags;
4846 dev->flags |= IFF_PROMISC;
4847 dev->promiscuity += inc;
4848 if (dev->promiscuity == 0) {
4851 * If inc causes overflow, untouch promisc and return error.
4854 dev->flags &= ~IFF_PROMISC;
4856 dev->promiscuity -= inc;
4857 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
4862 if (dev->flags != old_flags) {
4863 pr_info("device %s %s promiscuous mode\n",
4865 dev->flags & IFF_PROMISC ? "entered" : "left");
4866 if (audit_enabled) {
4867 current_uid_gid(&uid, &gid);
4868 audit_log(current->audit_context, GFP_ATOMIC,
4869 AUDIT_ANOM_PROMISCUOUS,
4870 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
4871 dev->name, (dev->flags & IFF_PROMISC),
4872 (old_flags & IFF_PROMISC),
4873 from_kuid(&init_user_ns, audit_get_loginuid(current)),
4874 from_kuid(&init_user_ns, uid),
4875 from_kgid(&init_user_ns, gid),
4876 audit_get_sessionid(current));
4879 dev_change_rx_flags(dev, IFF_PROMISC);
4885 * dev_set_promiscuity - update promiscuity count on a device
4889 * Add or remove promiscuity from a device. While the count in the device
4890 * remains above zero the interface remains promiscuous. Once it hits zero
4891 * the device reverts back to normal filtering operation. A negative inc
4892 * value is used to drop promiscuity on the device.
4893 * Return 0 if successful or a negative errno code on error.
4895 int dev_set_promiscuity(struct net_device *dev, int inc)
4897 unsigned int old_flags = dev->flags;
4900 err = __dev_set_promiscuity(dev, inc);
4903 if (dev->flags != old_flags)
4904 dev_set_rx_mode(dev);
4907 EXPORT_SYMBOL(dev_set_promiscuity);
4910 * dev_set_allmulti - update allmulti count on a device
4914 * Add or remove reception of all multicast frames to a device. While the
4915 * count in the device remains above zero the interface remains listening
4916 * to all interfaces. Once it hits zero the device reverts back to normal
4917 * filtering operation. A negative @inc value is used to drop the counter
4918 * when releasing a resource needing all multicasts.
4919 * Return 0 if successful or a negative errno code on error.
4922 int dev_set_allmulti(struct net_device *dev, int inc)
4924 unsigned int old_flags = dev->flags;
4928 dev->flags |= IFF_ALLMULTI;
4929 dev->allmulti += inc;
4930 if (dev->allmulti == 0) {
4933 * If inc causes overflow, untouch allmulti and return error.
4936 dev->flags &= ~IFF_ALLMULTI;
4938 dev->allmulti -= inc;
4939 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
4944 if (dev->flags ^ old_flags) {
4945 dev_change_rx_flags(dev, IFF_ALLMULTI);
4946 dev_set_rx_mode(dev);
4950 EXPORT_SYMBOL(dev_set_allmulti);
4953 * Upload unicast and multicast address lists to device and
4954 * configure RX filtering. When the device doesn't support unicast
4955 * filtering it is put in promiscuous mode while unicast addresses
4958 void __dev_set_rx_mode(struct net_device *dev)
4960 const struct net_device_ops *ops = dev->netdev_ops;
4962 /* dev_open will call this function so the list will stay sane. */
4963 if (!(dev->flags&IFF_UP))
4966 if (!netif_device_present(dev))
4969 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4970 /* Unicast addresses changes may only happen under the rtnl,
4971 * therefore calling __dev_set_promiscuity here is safe.
4973 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4974 __dev_set_promiscuity(dev, 1);
4975 dev->uc_promisc = true;
4976 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4977 __dev_set_promiscuity(dev, -1);
4978 dev->uc_promisc = false;
4982 if (ops->ndo_set_rx_mode)
4983 ops->ndo_set_rx_mode(dev);
4986 void dev_set_rx_mode(struct net_device *dev)
4988 netif_addr_lock_bh(dev);
4989 __dev_set_rx_mode(dev);
4990 netif_addr_unlock_bh(dev);
4994 * dev_get_flags - get flags reported to userspace
4997 * Get the combination of flag bits exported through APIs to userspace.
4999 unsigned int dev_get_flags(const struct net_device *dev)
5003 flags = (dev->flags & ~(IFF_PROMISC |
5008 (dev->gflags & (IFF_PROMISC |
5011 if (netif_running(dev)) {
5012 if (netif_oper_up(dev))
5013 flags |= IFF_RUNNING;
5014 if (netif_carrier_ok(dev))
5015 flags |= IFF_LOWER_UP;
5016 if (netif_dormant(dev))
5017 flags |= IFF_DORMANT;
5022 EXPORT_SYMBOL(dev_get_flags);
5024 int __dev_change_flags(struct net_device *dev, unsigned int flags)
5026 unsigned int old_flags = dev->flags;
5032 * Set the flags on our device.
5035 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
5036 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
5038 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
5042 * Load in the correct multicast list now the flags have changed.
5045 if ((old_flags ^ flags) & IFF_MULTICAST)
5046 dev_change_rx_flags(dev, IFF_MULTICAST);
5048 dev_set_rx_mode(dev);
5051 * Have we downed the interface. We handle IFF_UP ourselves
5052 * according to user attempts to set it, rather than blindly
5057 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
5058 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
5061 dev_set_rx_mode(dev);
5064 if ((flags ^ dev->gflags) & IFF_PROMISC) {
5065 int inc = (flags & IFF_PROMISC) ? 1 : -1;
5067 dev->gflags ^= IFF_PROMISC;
5068 dev_set_promiscuity(dev, inc);
5071 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
5072 is important. Some (broken) drivers set IFF_PROMISC, when
5073 IFF_ALLMULTI is requested not asking us and not reporting.
5075 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
5076 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
5078 dev->gflags ^= IFF_ALLMULTI;
5079 dev_set_allmulti(dev, inc);
5085 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
5087 unsigned int changes = dev->flags ^ old_flags;
5089 if (changes & IFF_UP) {
5090 if (dev->flags & IFF_UP)
5091 call_netdevice_notifiers(NETDEV_UP, dev);
5093 call_netdevice_notifiers(NETDEV_DOWN, dev);
5096 if (dev->flags & IFF_UP &&
5097 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
5098 call_netdevice_notifiers(NETDEV_CHANGE, dev);
5102 * dev_change_flags - change device settings
5104 * @flags: device state flags
5106 * Change settings on device based state flags. The flags are
5107 * in the userspace exported format.
5109 int dev_change_flags(struct net_device *dev, unsigned int flags)
5112 unsigned int changes, old_flags = dev->flags;
5114 ret = __dev_change_flags(dev, flags);
5118 changes = old_flags ^ dev->flags;
5120 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
5122 __dev_notify_flags(dev, old_flags);
5125 EXPORT_SYMBOL(dev_change_flags);
5128 * dev_set_mtu - Change maximum transfer unit
5130 * @new_mtu: new transfer unit
5132 * Change the maximum transfer size of the network device.
5134 int dev_set_mtu(struct net_device *dev, int new_mtu)
5136 const struct net_device_ops *ops = dev->netdev_ops;
5139 if (new_mtu == dev->mtu)
5142 /* MTU must be positive. */
5146 if (!netif_device_present(dev))
5150 if (ops->ndo_change_mtu)
5151 err = ops->ndo_change_mtu(dev, new_mtu);
5156 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
5159 EXPORT_SYMBOL(dev_set_mtu);
5162 * dev_set_group - Change group this device belongs to
5164 * @new_group: group this device should belong to
5166 void dev_set_group(struct net_device *dev, int new_group)
5168 dev->group = new_group;
5170 EXPORT_SYMBOL(dev_set_group);
5173 * dev_set_mac_address - Change Media Access Control Address
5177 * Change the hardware (MAC) address of the device
5179 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
5181 const struct net_device_ops *ops = dev->netdev_ops;
5184 if (!ops->ndo_set_mac_address)
5186 if (sa->sa_family != dev->type)
5188 if (!netif_device_present(dev))
5190 err = ops->ndo_set_mac_address(dev, sa);
5193 dev->addr_assign_type = NET_ADDR_SET;
5194 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
5195 add_device_randomness(dev->dev_addr, dev->addr_len);
5198 EXPORT_SYMBOL(dev_set_mac_address);
5201 * dev_change_carrier - Change device carrier
5203 * @new_carries: new value
5205 * Change device carrier
5207 int dev_change_carrier(struct net_device *dev, bool new_carrier)
5209 const struct net_device_ops *ops = dev->netdev_ops;
5211 if (!ops->ndo_change_carrier)
5213 if (!netif_device_present(dev))
5215 return ops->ndo_change_carrier(dev, new_carrier);
5217 EXPORT_SYMBOL(dev_change_carrier);
5220 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
5222 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
5225 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
5231 case SIOCGIFFLAGS: /* Get interface flags */
5232 ifr->ifr_flags = (short) dev_get_flags(dev);
5235 case SIOCGIFMETRIC: /* Get the metric on the interface
5236 (currently unused) */
5237 ifr->ifr_metric = 0;
5240 case SIOCGIFMTU: /* Get the MTU of a device */
5241 ifr->ifr_mtu = dev->mtu;
5246 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
5248 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
5249 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
5250 ifr->ifr_hwaddr.sa_family = dev->type;
5258 ifr->ifr_map.mem_start = dev->mem_start;
5259 ifr->ifr_map.mem_end = dev->mem_end;
5260 ifr->ifr_map.base_addr = dev->base_addr;
5261 ifr->ifr_map.irq = dev->irq;
5262 ifr->ifr_map.dma = dev->dma;
5263 ifr->ifr_map.port = dev->if_port;
5267 ifr->ifr_ifindex = dev->ifindex;
5271 ifr->ifr_qlen = dev->tx_queue_len;
5275 /* dev_ioctl() should ensure this case
5287 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
5289 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
5292 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
5293 const struct net_device_ops *ops;
5298 ops = dev->netdev_ops;
5301 case SIOCSIFFLAGS: /* Set interface flags */
5302 return dev_change_flags(dev, ifr->ifr_flags);
5304 case SIOCSIFMETRIC: /* Set the metric on the interface
5305 (currently unused) */
5308 case SIOCSIFMTU: /* Set the MTU of a device */
5309 return dev_set_mtu(dev, ifr->ifr_mtu);
5312 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
5314 case SIOCSIFHWBROADCAST:
5315 if (ifr->ifr_hwaddr.sa_family != dev->type)
5317 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
5318 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
5319 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
5323 if (ops->ndo_set_config) {
5324 if (!netif_device_present(dev))
5326 return ops->ndo_set_config(dev, &ifr->ifr_map);
5331 if (!ops->ndo_set_rx_mode ||
5332 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
5334 if (!netif_device_present(dev))
5336 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
5339 if (!ops->ndo_set_rx_mode ||
5340 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
5342 if (!netif_device_present(dev))
5344 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
5347 if (ifr->ifr_qlen < 0)
5349 dev->tx_queue_len = ifr->ifr_qlen;
5353 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
5354 return dev_change_name(dev, ifr->ifr_newname);
5357 err = net_hwtstamp_validate(ifr);
5363 * Unknown or private ioctl
5366 if ((cmd >= SIOCDEVPRIVATE &&
5367 cmd <= SIOCDEVPRIVATE + 15) ||
5368 cmd == SIOCBONDENSLAVE ||
5369 cmd == SIOCBONDRELEASE ||
5370 cmd == SIOCBONDSETHWADDR ||
5371 cmd == SIOCBONDSLAVEINFOQUERY ||
5372 cmd == SIOCBONDINFOQUERY ||
5373 cmd == SIOCBONDCHANGEACTIVE ||
5374 cmd == SIOCGMIIPHY ||
5375 cmd == SIOCGMIIREG ||
5376 cmd == SIOCSMIIREG ||
5377 cmd == SIOCBRADDIF ||
5378 cmd == SIOCBRDELIF ||
5379 cmd == SIOCSHWTSTAMP ||
5380 cmd == SIOCWANDEV) {
5382 if (ops->ndo_do_ioctl) {
5383 if (netif_device_present(dev))
5384 err = ops->ndo_do_ioctl(dev, ifr, cmd);
5396 * This function handles all "interface"-type I/O control requests. The actual
5397 * 'doing' part of this is dev_ifsioc above.
5401 * dev_ioctl - network device ioctl
5402 * @net: the applicable net namespace
5403 * @cmd: command to issue
5404 * @arg: pointer to a struct ifreq in user space
5406 * Issue ioctl functions to devices. This is normally called by the
5407 * user space syscall interfaces but can sometimes be useful for
5408 * other purposes. The return value is the return from the syscall if
5409 * positive or a negative errno code on error.
5412 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
5418 /* One special case: SIOCGIFCONF takes ifconf argument
5419 and requires shared lock, because it sleeps writing
5423 if (cmd == SIOCGIFCONF) {
5425 ret = dev_ifconf(net, (char __user *) arg);
5429 if (cmd == SIOCGIFNAME)
5430 return dev_ifname(net, (struct ifreq __user *)arg);
5432 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
5435 ifr.ifr_name[IFNAMSIZ-1] = 0;
5437 colon = strchr(ifr.ifr_name, ':');
5442 * See which interface the caller is talking about.
5447 * These ioctl calls:
5448 * - can be done by all.
5449 * - atomic and do not require locking.
5460 dev_load(net, ifr.ifr_name);
5462 ret = dev_ifsioc_locked(net, &ifr, cmd);
5467 if (copy_to_user(arg, &ifr,
5468 sizeof(struct ifreq)))
5474 dev_load(net, ifr.ifr_name);
5476 ret = dev_ethtool(net, &ifr);
5481 if (copy_to_user(arg, &ifr,
5482 sizeof(struct ifreq)))
5488 * These ioctl calls:
5489 * - require superuser power.
5490 * - require strict serialization.
5496 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5498 dev_load(net, ifr.ifr_name);
5500 ret = dev_ifsioc(net, &ifr, cmd);
5505 if (copy_to_user(arg, &ifr,
5506 sizeof(struct ifreq)))
5512 * These ioctl calls:
5513 * - require superuser power.
5514 * - require strict serialization.
5515 * - do not return a value
5519 if (!capable(CAP_NET_ADMIN))
5523 * These ioctl calls:
5524 * - require local superuser power.
5525 * - require strict serialization.
5526 * - do not return a value
5535 case SIOCSIFHWBROADCAST:
5537 case SIOCBONDENSLAVE:
5538 case SIOCBONDRELEASE:
5539 case SIOCBONDSETHWADDR:
5540 case SIOCBONDCHANGEACTIVE:
5544 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
5547 case SIOCBONDSLAVEINFOQUERY:
5548 case SIOCBONDINFOQUERY:
5549 dev_load(net, ifr.ifr_name);
5551 ret = dev_ifsioc(net, &ifr, cmd);
5556 /* Get the per device memory space. We can add this but
5557 * currently do not support it */
5559 /* Set the per device memory buffer space.
5560 * Not applicable in our case */
5565 * Unknown or private ioctl.
5568 if (cmd == SIOCWANDEV ||
5569 (cmd >= SIOCDEVPRIVATE &&
5570 cmd <= SIOCDEVPRIVATE + 15)) {
5571 dev_load(net, ifr.ifr_name);
5573 ret = dev_ifsioc(net, &ifr, cmd);
5575 if (!ret && copy_to_user(arg, &ifr,
5576 sizeof(struct ifreq)))
5580 /* Take care of Wireless Extensions */
5581 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
5582 return wext_handle_ioctl(net, &ifr, cmd, arg);
5589 * dev_new_index - allocate an ifindex
5590 * @net: the applicable net namespace
5592 * Returns a suitable unique value for a new device interface
5593 * number. The caller must hold the rtnl semaphore or the
5594 * dev_base_lock to be sure it remains unique.
5596 static int dev_new_index(struct net *net)
5598 int ifindex = net->ifindex;
5602 if (!__dev_get_by_index(net, ifindex))
5603 return net->ifindex = ifindex;
5607 /* Delayed registration/unregisteration */
5608 static LIST_HEAD(net_todo_list);
5610 static void net_set_todo(struct net_device *dev)
5612 list_add_tail(&dev->todo_list, &net_todo_list);
5615 static void rollback_registered_many(struct list_head *head)
5617 struct net_device *dev, *tmp;
5619 BUG_ON(dev_boot_phase);
5622 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5623 /* Some devices call without registering
5624 * for initialization unwind. Remove those
5625 * devices and proceed with the remaining.
5627 if (dev->reg_state == NETREG_UNINITIALIZED) {
5628 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
5632 list_del(&dev->unreg_list);
5635 dev->dismantle = true;
5636 BUG_ON(dev->reg_state != NETREG_REGISTERED);
5639 /* If device is running, close it first. */
5640 dev_close_many(head);
5642 list_for_each_entry(dev, head, unreg_list) {
5643 /* And unlink it from device chain. */
5644 unlist_netdevice(dev);
5646 dev->reg_state = NETREG_UNREGISTERING;
5651 list_for_each_entry(dev, head, unreg_list) {
5652 /* Shutdown queueing discipline. */
5656 /* Notify protocols, that we are about to destroy
5657 this device. They should clean all the things.
5659 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5661 if (!dev->rtnl_link_ops ||
5662 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
5663 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
5666 * Flush the unicast and multicast chains
5671 if (dev->netdev_ops->ndo_uninit)
5672 dev->netdev_ops->ndo_uninit(dev);
5674 /* Notifier chain MUST detach us all upper devices. */
5675 WARN_ON(netdev_has_any_upper_dev(dev));
5677 /* Remove entries from kobject tree */
5678 netdev_unregister_kobject(dev);
5683 list_for_each_entry(dev, head, unreg_list)
5687 static void rollback_registered(struct net_device *dev)
5691 list_add(&dev->unreg_list, &single);
5692 rollback_registered_many(&single);
5696 static netdev_features_t netdev_fix_features(struct net_device *dev,
5697 netdev_features_t features)
5699 /* Fix illegal checksum combinations */
5700 if ((features & NETIF_F_HW_CSUM) &&
5701 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5702 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5703 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
5706 /* Fix illegal SG+CSUM combinations. */
5707 if ((features & NETIF_F_SG) &&
5708 !(features & NETIF_F_ALL_CSUM)) {
5710 "Dropping NETIF_F_SG since no checksum feature.\n");
5711 features &= ~NETIF_F_SG;
5714 /* TSO requires that SG is present as well. */
5715 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5716 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5717 features &= ~NETIF_F_ALL_TSO;
5720 /* TSO ECN requires that TSO is present as well. */
5721 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
5722 features &= ~NETIF_F_TSO_ECN;
5724 /* Software GSO depends on SG. */
5725 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5726 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5727 features &= ~NETIF_F_GSO;
5730 /* UFO needs SG and checksumming */
5731 if (features & NETIF_F_UFO) {
5732 /* maybe split UFO into V4 and V6? */
5733 if (!((features & NETIF_F_GEN_CSUM) ||
5734 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
5735 == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5737 "Dropping NETIF_F_UFO since no checksum offload features.\n");
5738 features &= ~NETIF_F_UFO;
5741 if (!(features & NETIF_F_SG)) {
5743 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5744 features &= ~NETIF_F_UFO;
5751 int __netdev_update_features(struct net_device *dev)
5753 netdev_features_t features;
5758 features = netdev_get_wanted_features(dev);
5760 if (dev->netdev_ops->ndo_fix_features)
5761 features = dev->netdev_ops->ndo_fix_features(dev, features);
5763 /* driver might be less strict about feature dependencies */
5764 features = netdev_fix_features(dev, features);
5766 if (dev->features == features)
5769 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
5770 &dev->features, &features);
5772 if (dev->netdev_ops->ndo_set_features)
5773 err = dev->netdev_ops->ndo_set_features(dev, features);
5775 if (unlikely(err < 0)) {
5777 "set_features() failed (%d); wanted %pNF, left %pNF\n",
5778 err, &features, &dev->features);
5783 dev->features = features;
5789 * netdev_update_features - recalculate device features
5790 * @dev: the device to check
5792 * Recalculate dev->features set and send notifications if it
5793 * has changed. Should be called after driver or hardware dependent
5794 * conditions might have changed that influence the features.
5796 void netdev_update_features(struct net_device *dev)
5798 if (__netdev_update_features(dev))
5799 netdev_features_change(dev);
5801 EXPORT_SYMBOL(netdev_update_features);
5804 * netdev_change_features - recalculate device features
5805 * @dev: the device to check
5807 * Recalculate dev->features set and send notifications even
5808 * if they have not changed. Should be called instead of
5809 * netdev_update_features() if also dev->vlan_features might
5810 * have changed to allow the changes to be propagated to stacked
5813 void netdev_change_features(struct net_device *dev)
5815 __netdev_update_features(dev);
5816 netdev_features_change(dev);
5818 EXPORT_SYMBOL(netdev_change_features);
5821 * netif_stacked_transfer_operstate - transfer operstate
5822 * @rootdev: the root or lower level device to transfer state from
5823 * @dev: the device to transfer operstate to
5825 * Transfer operational state from root to device. This is normally
5826 * called when a stacking relationship exists between the root
5827 * device and the device(a leaf device).
5829 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
5830 struct net_device *dev)
5832 if (rootdev->operstate == IF_OPER_DORMANT)
5833 netif_dormant_on(dev);
5835 netif_dormant_off(dev);
5837 if (netif_carrier_ok(rootdev)) {
5838 if (!netif_carrier_ok(dev))
5839 netif_carrier_on(dev);
5841 if (netif_carrier_ok(dev))
5842 netif_carrier_off(dev);
5845 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
5848 static int netif_alloc_rx_queues(struct net_device *dev)
5850 unsigned int i, count = dev->num_rx_queues;
5851 struct netdev_rx_queue *rx;
5855 rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
5857 pr_err("netdev: Unable to allocate %u rx queues\n", count);
5862 for (i = 0; i < count; i++)
5868 static void netdev_init_one_queue(struct net_device *dev,
5869 struct netdev_queue *queue, void *_unused)
5871 /* Initialize queue lock */
5872 spin_lock_init(&queue->_xmit_lock);
5873 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
5874 queue->xmit_lock_owner = -1;
5875 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
5878 dql_init(&queue->dql, HZ);
5882 static int netif_alloc_netdev_queues(struct net_device *dev)
5884 unsigned int count = dev->num_tx_queues;
5885 struct netdev_queue *tx;
5889 tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
5891 pr_err("netdev: Unable to allocate %u tx queues\n", count);
5896 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5897 spin_lock_init(&dev->tx_global_lock);
5903 * register_netdevice - register a network device
5904 * @dev: device to register
5906 * Take a completed network device structure and add it to the kernel
5907 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
5908 * chain. 0 is returned on success. A negative errno code is returned
5909 * on a failure to set up the device, or if the name is a duplicate.
5911 * Callers must hold the rtnl semaphore. You may want
5912 * register_netdev() instead of this.
5915 * The locking appears insufficient to guarantee two parallel registers
5916 * will not get the same name.
5919 int register_netdevice(struct net_device *dev)
5922 struct net *net = dev_net(dev);
5924 BUG_ON(dev_boot_phase);
5929 /* When net_device's are persistent, this will be fatal. */
5930 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5933 spin_lock_init(&dev->addr_list_lock);
5934 netdev_set_addr_lockdep_class(dev);
5938 ret = dev_get_valid_name(net, dev, dev->name);
5942 /* Init, if this function is available */
5943 if (dev->netdev_ops->ndo_init) {
5944 ret = dev->netdev_ops->ndo_init(dev);
5954 dev->ifindex = dev_new_index(net);
5955 else if (__dev_get_by_index(net, dev->ifindex))
5958 if (dev->iflink == -1)
5959 dev->iflink = dev->ifindex;
5961 /* Transfer changeable features to wanted_features and enable
5962 * software offloads (GSO and GRO).
5964 dev->hw_features |= NETIF_F_SOFT_FEATURES;
5965 dev->features |= NETIF_F_SOFT_FEATURES;
5966 dev->wanted_features = dev->features & dev->hw_features;
5968 /* Turn on no cache copy if HW is doing checksum */
5969 if (!(dev->flags & IFF_LOOPBACK)) {
5970 dev->hw_features |= NETIF_F_NOCACHE_COPY;
5971 if (dev->features & NETIF_F_ALL_CSUM) {
5972 dev->wanted_features |= NETIF_F_NOCACHE_COPY;
5973 dev->features |= NETIF_F_NOCACHE_COPY;
5977 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5979 dev->vlan_features |= NETIF_F_HIGHDMA;
5981 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
5982 ret = notifier_to_errno(ret);
5986 ret = netdev_register_kobject(dev);
5989 dev->reg_state = NETREG_REGISTERED;
5991 __netdev_update_features(dev);
5994 * Default initial state at registry is that the
5995 * device is present.
5998 set_bit(__LINK_STATE_PRESENT, &dev->state);
6000 linkwatch_init_dev(dev);
6002 dev_init_scheduler(dev);
6004 list_netdevice(dev);
6005 add_device_randomness(dev->dev_addr, dev->addr_len);
6007 /* Notify protocols, that a new device appeared. */
6008 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
6009 ret = notifier_to_errno(ret);
6011 rollback_registered(dev);
6012 dev->reg_state = NETREG_UNREGISTERED;
6015 * Prevent userspace races by waiting until the network
6016 * device is fully setup before sending notifications.
6018 if (!dev->rtnl_link_ops ||
6019 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
6020 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6026 if (dev->netdev_ops->ndo_uninit)
6027 dev->netdev_ops->ndo_uninit(dev);
6030 EXPORT_SYMBOL(register_netdevice);
6033 * init_dummy_netdev - init a dummy network device for NAPI
6034 * @dev: device to init
6036 * This takes a network device structure and initialize the minimum
6037 * amount of fields so it can be used to schedule NAPI polls without
6038 * registering a full blown interface. This is to be used by drivers
6039 * that need to tie several hardware interfaces to a single NAPI
6040 * poll scheduler due to HW limitations.
6042 int init_dummy_netdev(struct net_device *dev)
6044 /* Clear everything. Note we don't initialize spinlocks
6045 * are they aren't supposed to be taken by any of the
6046 * NAPI code and this dummy netdev is supposed to be
6047 * only ever used for NAPI polls
6049 memset(dev, 0, sizeof(struct net_device));
6051 /* make sure we BUG if trying to hit standard
6052 * register/unregister code path
6054 dev->reg_state = NETREG_DUMMY;
6056 /* NAPI wants this */
6057 INIT_LIST_HEAD(&dev->napi_list);
6059 /* a dummy interface is started by default */
6060 set_bit(__LINK_STATE_PRESENT, &dev->state);
6061 set_bit(__LINK_STATE_START, &dev->state);
6063 /* Note : We dont allocate pcpu_refcnt for dummy devices,
6064 * because users of this 'device' dont need to change
6070 EXPORT_SYMBOL_GPL(init_dummy_netdev);
6074 * register_netdev - register a network device
6075 * @dev: device to register
6077 * Take a completed network device structure and add it to the kernel
6078 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
6079 * chain. 0 is returned on success. A negative errno code is returned
6080 * on a failure to set up the device, or if the name is a duplicate.
6082 * This is a wrapper around register_netdevice that takes the rtnl semaphore
6083 * and expands the device name if you passed a format string to
6086 int register_netdev(struct net_device *dev)
6091 err = register_netdevice(dev);
6095 EXPORT_SYMBOL(register_netdev);
6097 int netdev_refcnt_read(const struct net_device *dev)
6101 for_each_possible_cpu(i)
6102 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
6105 EXPORT_SYMBOL(netdev_refcnt_read);
6108 * netdev_wait_allrefs - wait until all references are gone.
6109 * @dev: target net_device
6111 * This is called when unregistering network devices.
6113 * Any protocol or device that holds a reference should register
6114 * for netdevice notification, and cleanup and put back the
6115 * reference if they receive an UNREGISTER event.
6116 * We can get stuck here if buggy protocols don't correctly
6119 static void netdev_wait_allrefs(struct net_device *dev)
6121 unsigned long rebroadcast_time, warning_time;
6124 linkwatch_forget_dev(dev);
6126 rebroadcast_time = warning_time = jiffies;
6127 refcnt = netdev_refcnt_read(dev);
6129 while (refcnt != 0) {
6130 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
6133 /* Rebroadcast unregister notification */
6134 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6140 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
6141 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
6143 /* We must not have linkwatch events
6144 * pending on unregister. If this
6145 * happens, we simply run the queue
6146 * unscheduled, resulting in a noop
6149 linkwatch_run_queue();
6154 rebroadcast_time = jiffies;
6159 refcnt = netdev_refcnt_read(dev);
6161 if (time_after(jiffies, warning_time + 10 * HZ)) {
6162 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
6164 warning_time = jiffies;
6173 * register_netdevice(x1);
6174 * register_netdevice(x2);
6176 * unregister_netdevice(y1);
6177 * unregister_netdevice(y2);
6183 * We are invoked by rtnl_unlock().
6184 * This allows us to deal with problems:
6185 * 1) We can delete sysfs objects which invoke hotplug
6186 * without deadlocking with linkwatch via keventd.
6187 * 2) Since we run with the RTNL semaphore not held, we can sleep
6188 * safely in order to wait for the netdev refcnt to drop to zero.
6190 * We must not return until all unregister events added during
6191 * the interval the lock was held have been completed.
6193 void netdev_run_todo(void)
6195 struct list_head list;
6197 /* Snapshot list, allow later requests */
6198 list_replace_init(&net_todo_list, &list);
6203 /* Wait for rcu callbacks to finish before next phase */
6204 if (!list_empty(&list))
6207 while (!list_empty(&list)) {
6208 struct net_device *dev
6209 = list_first_entry(&list, struct net_device, todo_list);
6210 list_del(&dev->todo_list);
6213 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
6216 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
6217 pr_err("network todo '%s' but state %d\n",
6218 dev->name, dev->reg_state);
6223 dev->reg_state = NETREG_UNREGISTERED;
6225 on_each_cpu(flush_backlog, dev, 1);
6227 netdev_wait_allrefs(dev);
6230 BUG_ON(netdev_refcnt_read(dev));
6231 WARN_ON(rcu_access_pointer(dev->ip_ptr));
6232 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
6233 WARN_ON(dev->dn_ptr);
6235 if (dev->destructor)
6236 dev->destructor(dev);
6238 /* Free network device */
6239 kobject_put(&dev->dev.kobj);
6243 /* Convert net_device_stats to rtnl_link_stats64. They have the same
6244 * fields in the same order, with only the type differing.
6246 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
6247 const struct net_device_stats *netdev_stats)
6249 #if BITS_PER_LONG == 64
6250 BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
6251 memcpy(stats64, netdev_stats, sizeof(*stats64));
6253 size_t i, n = sizeof(*stats64) / sizeof(u64);
6254 const unsigned long *src = (const unsigned long *)netdev_stats;
6255 u64 *dst = (u64 *)stats64;
6257 BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
6258 sizeof(*stats64) / sizeof(u64));
6259 for (i = 0; i < n; i++)
6263 EXPORT_SYMBOL(netdev_stats_to_stats64);
6266 * dev_get_stats - get network device statistics
6267 * @dev: device to get statistics from
6268 * @storage: place to store stats
6270 * Get network statistics from device. Return @storage.
6271 * The device driver may provide its own method by setting
6272 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
6273 * otherwise the internal statistics structure is used.
6275 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
6276 struct rtnl_link_stats64 *storage)
6278 const struct net_device_ops *ops = dev->netdev_ops;
6280 if (ops->ndo_get_stats64) {
6281 memset(storage, 0, sizeof(*storage));
6282 ops->ndo_get_stats64(dev, storage);
6283 } else if (ops->ndo_get_stats) {
6284 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
6286 netdev_stats_to_stats64(storage, &dev->stats);
6288 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
6291 EXPORT_SYMBOL(dev_get_stats);
6293 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
6295 struct netdev_queue *queue = dev_ingress_queue(dev);
6297 #ifdef CONFIG_NET_CLS_ACT
6300 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
6303 netdev_init_one_queue(dev, queue, NULL);
6304 queue->qdisc = &noop_qdisc;
6305 queue->qdisc_sleeping = &noop_qdisc;
6306 rcu_assign_pointer(dev->ingress_queue, queue);
6311 static const struct ethtool_ops default_ethtool_ops;
6314 * alloc_netdev_mqs - allocate network device
6315 * @sizeof_priv: size of private data to allocate space for
6316 * @name: device name format string
6317 * @setup: callback to initialize device
6318 * @txqs: the number of TX subqueues to allocate
6319 * @rxqs: the number of RX subqueues to allocate
6321 * Allocates a struct net_device with private data area for driver use
6322 * and performs basic initialization. Also allocates subquue structs
6323 * for each queue on the device.
6325 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
6326 void (*setup)(struct net_device *),
6327 unsigned int txqs, unsigned int rxqs)
6329 struct net_device *dev;
6331 struct net_device *p;
6333 BUG_ON(strlen(name) >= sizeof(dev->name));
6336 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
6342 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
6347 alloc_size = sizeof(struct net_device);
6349 /* ensure 32-byte alignment of private area */
6350 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
6351 alloc_size += sizeof_priv;
6353 /* ensure 32-byte alignment of whole construct */
6354 alloc_size += NETDEV_ALIGN - 1;
6356 p = kzalloc(alloc_size, GFP_KERNEL);
6358 pr_err("alloc_netdev: Unable to allocate device\n");
6362 dev = PTR_ALIGN(p, NETDEV_ALIGN);
6363 dev->padded = (char *)dev - (char *)p;
6365 dev->pcpu_refcnt = alloc_percpu(int);
6366 if (!dev->pcpu_refcnt)
6369 if (dev_addr_init(dev))
6375 dev_net_set(dev, &init_net);
6377 dev->gso_max_size = GSO_MAX_SIZE;
6378 dev->gso_max_segs = GSO_MAX_SEGS;
6380 INIT_LIST_HEAD(&dev->napi_list);
6381 INIT_LIST_HEAD(&dev->unreg_list);
6382 INIT_LIST_HEAD(&dev->link_watch_list);
6383 INIT_LIST_HEAD(&dev->upper_dev_list);
6384 dev->priv_flags = IFF_XMIT_DST_RELEASE;
6387 dev->num_tx_queues = txqs;
6388 dev->real_num_tx_queues = txqs;
6389 if (netif_alloc_netdev_queues(dev))
6393 dev->num_rx_queues = rxqs;
6394 dev->real_num_rx_queues = rxqs;
6395 if (netif_alloc_rx_queues(dev))
6399 strcpy(dev->name, name);
6400 dev->group = INIT_NETDEV_GROUP;
6401 if (!dev->ethtool_ops)
6402 dev->ethtool_ops = &default_ethtool_ops;
6410 free_percpu(dev->pcpu_refcnt);
6420 EXPORT_SYMBOL(alloc_netdev_mqs);
6423 * free_netdev - free network device
6426 * This function does the last stage of destroying an allocated device
6427 * interface. The reference to the device object is released.
6428 * If this is the last reference then it will be freed.
6430 void free_netdev(struct net_device *dev)
6432 struct napi_struct *p, *n;
6434 release_net(dev_net(dev));
6441 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6443 /* Flush device addresses */
6444 dev_addr_flush(dev);
6446 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
6449 free_percpu(dev->pcpu_refcnt);
6450 dev->pcpu_refcnt = NULL;
6452 /* Compatibility with error handling in drivers */
6453 if (dev->reg_state == NETREG_UNINITIALIZED) {
6454 kfree((char *)dev - dev->padded);
6458 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
6459 dev->reg_state = NETREG_RELEASED;
6461 /* will free via device release */
6462 put_device(&dev->dev);
6464 EXPORT_SYMBOL(free_netdev);
6467 * synchronize_net - Synchronize with packet receive processing
6469 * Wait for packets currently being received to be done.
6470 * Does not block later packets from starting.
6472 void synchronize_net(void)
6475 if (rtnl_is_locked())
6476 synchronize_rcu_expedited();
6480 EXPORT_SYMBOL(synchronize_net);
6483 * unregister_netdevice_queue - remove device from the kernel
6487 * This function shuts down a device interface and removes it
6488 * from the kernel tables.
6489 * If head not NULL, device is queued to be unregistered later.
6491 * Callers must hold the rtnl semaphore. You may want
6492 * unregister_netdev() instead of this.
6495 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
6500 list_move_tail(&dev->unreg_list, head);
6502 rollback_registered(dev);
6503 /* Finish processing unregister after unlock */
6507 EXPORT_SYMBOL(unregister_netdevice_queue);
6510 * unregister_netdevice_many - unregister many devices
6511 * @head: list of devices
6513 void unregister_netdevice_many(struct list_head *head)
6515 struct net_device *dev;
6517 if (!list_empty(head)) {
6518 rollback_registered_many(head);
6519 list_for_each_entry(dev, head, unreg_list)
6523 EXPORT_SYMBOL(unregister_netdevice_many);
6526 * unregister_netdev - remove device from the kernel
6529 * This function shuts down a device interface and removes it
6530 * from the kernel tables.
6532 * This is just a wrapper for unregister_netdevice that takes
6533 * the rtnl semaphore. In general you want to use this and not
6534 * unregister_netdevice.
6536 void unregister_netdev(struct net_device *dev)
6539 unregister_netdevice(dev);
6542 EXPORT_SYMBOL(unregister_netdev);
6545 * dev_change_net_namespace - move device to different nethost namespace
6547 * @net: network namespace
6548 * @pat: If not NULL name pattern to try if the current device name
6549 * is already taken in the destination network namespace.
6551 * This function shuts down a device interface and moves it
6552 * to a new network namespace. On success 0 is returned, on
6553 * a failure a netagive errno code is returned.
6555 * Callers must hold the rtnl semaphore.
6558 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
6564 /* Don't allow namespace local devices to be moved. */
6566 if (dev->features & NETIF_F_NETNS_LOCAL)
6569 /* Ensure the device has been registrered */
6570 if (dev->reg_state != NETREG_REGISTERED)
6573 /* Get out if there is nothing todo */
6575 if (net_eq(dev_net(dev), net))
6578 /* Pick the destination device name, and ensure
6579 * we can use it in the destination network namespace.
6582 if (__dev_get_by_name(net, dev->name)) {
6583 /* We get here if we can't use the current device name */
6586 if (dev_get_valid_name(net, dev, pat) < 0)
6591 * And now a mini version of register_netdevice unregister_netdevice.
6594 /* If device is running close it first. */
6597 /* And unlink it from device chain */
6599 unlist_netdevice(dev);
6603 /* Shutdown queueing discipline. */
6606 /* Notify protocols, that we are about to destroy
6607 this device. They should clean all the things.
6609 Note that dev->reg_state stays at NETREG_REGISTERED.
6610 This is wanted because this way 8021q and macvlan know
6611 the device is just moving and can keep their slaves up.
6613 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6615 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
6616 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6619 * Flush the unicast and multicast chains
6624 /* Send a netdev-removed uevent to the old namespace */
6625 kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
6627 /* Actually switch the network namespace */
6628 dev_net_set(dev, net);
6630 /* If there is an ifindex conflict assign a new one */
6631 if (__dev_get_by_index(net, dev->ifindex)) {
6632 int iflink = (dev->iflink == dev->ifindex);
6633 dev->ifindex = dev_new_index(net);
6635 dev->iflink = dev->ifindex;
6638 /* Send a netdev-add uevent to the new namespace */
6639 kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
6641 /* Fixup kobjects */
6642 err = device_rename(&dev->dev, dev->name);
6645 /* Add the device back in the hashes */
6646 list_netdevice(dev);
6648 /* Notify protocols, that a new device appeared. */
6649 call_netdevice_notifiers(NETDEV_REGISTER, dev);
6652 * Prevent userspace races by waiting until the network
6653 * device is fully setup before sending notifications.
6655 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
6662 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6664 static int dev_cpu_callback(struct notifier_block *nfb,
6665 unsigned long action,
6668 struct sk_buff **list_skb;
6669 struct sk_buff *skb;
6670 unsigned int cpu, oldcpu = (unsigned long)ocpu;
6671 struct softnet_data *sd, *oldsd;
6673 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
6676 local_irq_disable();
6677 cpu = smp_processor_id();
6678 sd = &per_cpu(softnet_data, cpu);
6679 oldsd = &per_cpu(softnet_data, oldcpu);
6681 /* Find end of our completion_queue. */
6682 list_skb = &sd->completion_queue;
6684 list_skb = &(*list_skb)->next;
6685 /* Append completion queue from offline CPU. */
6686 *list_skb = oldsd->completion_queue;
6687 oldsd->completion_queue = NULL;
6689 /* Append output queue from offline CPU. */
6690 if (oldsd->output_queue) {
6691 *sd->output_queue_tailp = oldsd->output_queue;
6692 sd->output_queue_tailp = oldsd->output_queue_tailp;
6693 oldsd->output_queue = NULL;
6694 oldsd->output_queue_tailp = &oldsd->output_queue;
6696 /* Append NAPI poll list from offline CPU. */
6697 if (!list_empty(&oldsd->poll_list)) {
6698 list_splice_init(&oldsd->poll_list, &sd->poll_list);
6699 raise_softirq_irqoff(NET_RX_SOFTIRQ);
6702 raise_softirq_irqoff(NET_TX_SOFTIRQ);
6705 /* Process offline CPU's input_pkt_queue */
6706 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
6708 input_queue_head_incr(oldsd);
6710 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6712 input_queue_head_incr(oldsd);
6720 * netdev_increment_features - increment feature set by one
6721 * @all: current feature set
6722 * @one: new feature set
6723 * @mask: mask feature set
6725 * Computes a new feature set after adding a device with feature set
6726 * @one to the master device with current feature set @all. Will not
6727 * enable anything that is off in @mask. Returns the new feature set.
6729 netdev_features_t netdev_increment_features(netdev_features_t all,
6730 netdev_features_t one, netdev_features_t mask)
6732 if (mask & NETIF_F_GEN_CSUM)
6733 mask |= NETIF_F_ALL_CSUM;
6734 mask |= NETIF_F_VLAN_CHALLENGED;
6736 all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
6737 all &= one | ~NETIF_F_ALL_FOR_ALL;
6739 /* If one device supports hw checksumming, set for all. */
6740 if (all & NETIF_F_GEN_CSUM)
6741 all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6745 EXPORT_SYMBOL(netdev_increment_features);
6747 static struct hlist_head *netdev_create_hash(void)
6750 struct hlist_head *hash;
6752 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
6754 for (i = 0; i < NETDEV_HASHENTRIES; i++)
6755 INIT_HLIST_HEAD(&hash[i]);
6760 /* Initialize per network namespace state */
6761 static int __net_init netdev_init(struct net *net)
6763 if (net != &init_net)
6764 INIT_LIST_HEAD(&net->dev_base_head);
6766 net->dev_name_head = netdev_create_hash();
6767 if (net->dev_name_head == NULL)
6770 net->dev_index_head = netdev_create_hash();
6771 if (net->dev_index_head == NULL)
6777 kfree(net->dev_name_head);
6783 * netdev_drivername - network driver for the device
6784 * @dev: network device
6786 * Determine network driver for device.
6788 const char *netdev_drivername(const struct net_device *dev)
6790 const struct device_driver *driver;
6791 const struct device *parent;
6792 const char *empty = "";
6794 parent = dev->dev.parent;
6798 driver = parent->driver;
6799 if (driver && driver->name)
6800 return driver->name;
6804 static int __netdev_printk(const char *level, const struct net_device *dev,
6805 struct va_format *vaf)
6809 if (dev && dev->dev.parent) {
6810 r = dev_printk_emit(level[1] - '0',
6813 dev_driver_string(dev->dev.parent),
6814 dev_name(dev->dev.parent),
6815 netdev_name(dev), vaf);
6817 r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
6819 r = printk("%s(NULL net_device): %pV", level, vaf);
6825 int netdev_printk(const char *level, const struct net_device *dev,
6826 const char *format, ...)
6828 struct va_format vaf;
6832 va_start(args, format);
6837 r = __netdev_printk(level, dev, &vaf);
6843 EXPORT_SYMBOL(netdev_printk);
6845 #define define_netdev_printk_level(func, level) \
6846 int func(const struct net_device *dev, const char *fmt, ...) \
6849 struct va_format vaf; \
6852 va_start(args, fmt); \
6857 r = __netdev_printk(level, dev, &vaf); \
6863 EXPORT_SYMBOL(func);
6865 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
6866 define_netdev_printk_level(netdev_alert, KERN_ALERT);
6867 define_netdev_printk_level(netdev_crit, KERN_CRIT);
6868 define_netdev_printk_level(netdev_err, KERN_ERR);
6869 define_netdev_printk_level(netdev_warn, KERN_WARNING);
6870 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
6871 define_netdev_printk_level(netdev_info, KERN_INFO);
6873 static void __net_exit netdev_exit(struct net *net)
6875 kfree(net->dev_name_head);
6876 kfree(net->dev_index_head);
6879 static struct pernet_operations __net_initdata netdev_net_ops = {
6880 .init = netdev_init,
6881 .exit = netdev_exit,
6884 static void __net_exit default_device_exit(struct net *net)
6886 struct net_device *dev, *aux;
6888 * Push all migratable network devices back to the
6889 * initial network namespace
6892 for_each_netdev_safe(net, dev, aux) {
6894 char fb_name[IFNAMSIZ];
6896 /* Ignore unmoveable devices (i.e. loopback) */
6897 if (dev->features & NETIF_F_NETNS_LOCAL)
6900 /* Leave virtual devices for the generic cleanup */
6901 if (dev->rtnl_link_ops)
6904 /* Push remaining network devices to init_net */
6905 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
6906 err = dev_change_net_namespace(dev, &init_net, fb_name);
6908 pr_emerg("%s: failed to move %s to init_net: %d\n",
6909 __func__, dev->name, err);
6916 static void __net_exit default_device_exit_batch(struct list_head *net_list)
6918 /* At exit all network devices most be removed from a network
6919 * namespace. Do this in the reverse order of registration.
6920 * Do this across as many network namespaces as possible to
6921 * improve batching efficiency.
6923 struct net_device *dev;
6925 LIST_HEAD(dev_kill_list);
6928 list_for_each_entry(net, net_list, exit_list) {
6929 for_each_netdev_reverse(net, dev) {
6930 if (dev->rtnl_link_ops)
6931 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
6933 unregister_netdevice_queue(dev, &dev_kill_list);
6936 unregister_netdevice_many(&dev_kill_list);
6937 list_del(&dev_kill_list);
6941 static struct pernet_operations __net_initdata default_device_ops = {
6942 .exit = default_device_exit,
6943 .exit_batch = default_device_exit_batch,
6947 * Initialize the DEV module. At boot time this walks the device list and
6948 * unhooks any devices that fail to initialise (normally hardware not
6949 * present) and leaves us with a valid list of present and active devices.
6954 * This is called single threaded during boot, so no need
6955 * to take the rtnl semaphore.
6957 static int __init net_dev_init(void)
6959 int i, rc = -ENOMEM;
6961 BUG_ON(!dev_boot_phase);
6963 if (dev_proc_init())
6966 if (netdev_kobject_init())
6969 INIT_LIST_HEAD(&ptype_all);
6970 for (i = 0; i < PTYPE_HASH_SIZE; i++)
6971 INIT_LIST_HEAD(&ptype_base[i]);
6973 INIT_LIST_HEAD(&offload_base);
6975 if (register_pernet_subsys(&netdev_net_ops))
6979 * Initialise the packet receive queues.
6982 for_each_possible_cpu(i) {
6983 struct softnet_data *sd = &per_cpu(softnet_data, i);
6985 memset(sd, 0, sizeof(*sd));
6986 skb_queue_head_init(&sd->input_pkt_queue);
6987 skb_queue_head_init(&sd->process_queue);
6988 sd->completion_queue = NULL;
6989 INIT_LIST_HEAD(&sd->poll_list);
6990 sd->output_queue = NULL;
6991 sd->output_queue_tailp = &sd->output_queue;
6993 sd->csd.func = rps_trigger_softirq;
6999 sd->backlog.poll = process_backlog;
7000 sd->backlog.weight = weight_p;
7001 sd->backlog.gro_list = NULL;
7002 sd->backlog.gro_count = 0;
7007 /* The loopback device is special if any other network devices
7008 * is present in a network namespace the loopback device must
7009 * be present. Since we now dynamically allocate and free the
7010 * loopback device ensure this invariant is maintained by
7011 * keeping the loopback device as the first device on the
7012 * list of network devices. Ensuring the loopback devices
7013 * is the first device that appears and the last network device
7016 if (register_pernet_device(&loopback_net_ops))
7019 if (register_pernet_device(&default_device_ops))
7022 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
7023 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
7025 hotcpu_notifier(dev_cpu_callback, 0);
7033 subsys_initcall(net_dev_init);
7035 static int __init initialize_hashrnd(void)
7037 get_random_bytes(&hashrnd, sizeof(hashrnd));
7041 late_initcall_sync(initialize_hashrnd);