6574 lines
160 KiB
C
6574 lines
160 KiB
C
/*
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* NET3 Protocol independent device support routines.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Derived from the non IP parts of dev.c 1.0.19
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Mark Evans, <evansmp@uhura.aston.ac.uk>
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*
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* Additional Authors:
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* Florian la Roche <rzsfl@rz.uni-sb.de>
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* Alan Cox <gw4pts@gw4pts.ampr.org>
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* David Hinds <dahinds@users.sourceforge.net>
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* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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* Adam Sulmicki <adam@cfar.umd.edu>
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* Pekka Riikonen <priikone@poesidon.pspt.fi>
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*
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* Changes:
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* D.J. Barrow : Fixed bug where dev->refcnt gets set
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* to 2 if register_netdev gets called
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* before net_dev_init & also removed a
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* few lines of code in the process.
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* Alan Cox : device private ioctl copies fields back.
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* Alan Cox : Transmit queue code does relevant
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* stunts to keep the queue safe.
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* Alan Cox : Fixed double lock.
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* Alan Cox : Fixed promisc NULL pointer trap
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* ???????? : Support the full private ioctl range
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* Alan Cox : Moved ioctl permission check into
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* drivers
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* Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
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* Alan Cox : 100 backlog just doesn't cut it when
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* you start doing multicast video 8)
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* Alan Cox : Rewrote net_bh and list manager.
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* Alan Cox : Fix ETH_P_ALL echoback lengths.
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* Alan Cox : Took out transmit every packet pass
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* Saved a few bytes in the ioctl handler
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* Alan Cox : Network driver sets packet type before
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* calling netif_rx. Saves a function
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* call a packet.
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* Alan Cox : Hashed net_bh()
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* Richard Kooijman: Timestamp fixes.
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* Alan Cox : Wrong field in SIOCGIFDSTADDR
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* Alan Cox : Device lock protection.
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* Alan Cox : Fixed nasty side effect of device close
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* changes.
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* Rudi Cilibrasi : Pass the right thing to
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* set_mac_address()
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* Dave Miller : 32bit quantity for the device lock to
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* make it work out on a Sparc.
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* Bjorn Ekwall : Added KERNELD hack.
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* Alan Cox : Cleaned up the backlog initialise.
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* Craig Metz : SIOCGIFCONF fix if space for under
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* 1 device.
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* Thomas Bogendoerfer : Return ENODEV for dev_open, if there
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* is no device open function.
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* Andi Kleen : Fix error reporting for SIOCGIFCONF
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* Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
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* Cyrus Durgin : Cleaned for KMOD
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* Adam Sulmicki : Bug Fix : Network Device Unload
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* A network device unload needs to purge
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* the backlog queue.
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* Paul Rusty Russell : SIOCSIFNAME
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* Pekka Riikonen : Netdev boot-time settings code
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* Andrew Morton : Make unregister_netdevice wait
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* indefinitely on dev->refcnt
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* J Hadi Salim : - Backlog queue sampling
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* - netif_rx() feedback
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*/
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#include <asm/uaccess.h>
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#include <linux/bitops.h>
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#include <linux/capability.h>
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#include <linux/cpu.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/hash.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/mutex.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/if_ether.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/notifier.h>
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#include <linux/skbuff.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <linux/rtnetlink.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/stat.h>
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#include <net/dst.h>
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#include <net/pkt_sched.h>
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#include <net/checksum.h>
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#include <net/xfrm.h>
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#include <linux/highmem.h>
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#include <linux/init.h>
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#include <linux/kmod.h>
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#include <linux/module.h>
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#include <linux/netpoll.h>
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#include <linux/rcupdate.h>
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#include <linux/delay.h>
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#include <net/wext.h>
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#include <net/iw_handler.h>
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#include <asm/current.h>
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#include <linux/audit.h>
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#include <linux/dmaengine.h>
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#include <linux/err.h>
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#include <linux/ctype.h>
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#include <linux/if_arp.h>
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#include <linux/if_vlan.h>
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#include <linux/ip.h>
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#include <net/ip.h>
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#include <linux/ipv6.h>
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#include <linux/in.h>
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#include <linux/jhash.h>
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#include <linux/random.h>
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#include <trace/events/napi.h>
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#include <trace/events/net.h>
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#include <trace/events/skb.h>
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#include <linux/pci.h>
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#include <linux/inetdevice.h>
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#include <linux/cpu_rmap.h>
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#include <linux/net_tstamp.h>
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#include <linux/static_key.h>
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#include <net/flow_keys.h>
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#include "net-sysfs.h"
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/* Instead of increasing this, you should create a hash table. */
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#define MAX_GRO_SKBS 8
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/* This should be increased if a protocol with a bigger head is added. */
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#define GRO_MAX_HEAD (MAX_HEADER + 128)
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/*
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* The list of packet types we will receive (as opposed to discard)
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* and the routines to invoke.
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*
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* Why 16. Because with 16 the only overlap we get on a hash of the
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* low nibble of the protocol value is RARP/SNAP/X.25.
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*
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* NOTE: That is no longer true with the addition of VLAN tags. Not
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* sure which should go first, but I bet it won't make much
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* difference if we are running VLANs. The good news is that
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* this protocol won't be in the list unless compiled in, so
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* the average user (w/out VLANs) will not be adversely affected.
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* --BLG
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*
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* 0800 IP
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* 8100 802.1Q VLAN
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* 0001 802.3
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* 0002 AX.25
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* 0004 802.2
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* 8035 RARP
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* 0005 SNAP
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* 0805 X.25
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* 0806 ARP
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* 8137 IPX
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* 0009 Localtalk
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* 86DD IPv6
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*/
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#define PTYPE_HASH_SIZE (16)
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#define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
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static DEFINE_SPINLOCK(ptype_lock);
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static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
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static struct list_head ptype_all __read_mostly; /* Taps */
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/*
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* The @dev_base_head list is protected by @dev_base_lock and the rtnl
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* semaphore.
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*
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* Pure readers hold dev_base_lock for reading, or rcu_read_lock()
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*
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* Writers must hold the rtnl semaphore while they loop through the
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* dev_base_head list, and hold dev_base_lock for writing when they do the
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* actual updates. This allows pure readers to access the list even
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* while a writer is preparing to update it.
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*
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* To put it another way, dev_base_lock is held for writing only to
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* protect against pure readers; the rtnl semaphore provides the
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* protection against other writers.
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*
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* See, for example usages, register_netdevice() and
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* unregister_netdevice(), which must be called with the rtnl
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* semaphore held.
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*/
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DEFINE_RWLOCK(dev_base_lock);
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EXPORT_SYMBOL(dev_base_lock);
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static inline void dev_base_seq_inc(struct net *net)
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{
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while (++net->dev_base_seq == 0);
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}
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static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
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{
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unsigned int hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
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return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
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}
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static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
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{
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return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
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}
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static inline void rps_lock(struct softnet_data *sd)
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{
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#ifdef CONFIG_RPS
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spin_lock(&sd->input_pkt_queue.lock);
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#endif
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}
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static inline void rps_unlock(struct softnet_data *sd)
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{
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#ifdef CONFIG_RPS
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spin_unlock(&sd->input_pkt_queue.lock);
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#endif
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}
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/* Device list insertion */
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static int list_netdevice(struct net_device *dev)
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{
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struct net *net = dev_net(dev);
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ASSERT_RTNL();
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write_lock_bh(&dev_base_lock);
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list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
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hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
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hlist_add_head_rcu(&dev->index_hlist,
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dev_index_hash(net, dev->ifindex));
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write_unlock_bh(&dev_base_lock);
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dev_base_seq_inc(net);
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return 0;
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}
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/* Device list removal
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* caller must respect a RCU grace period before freeing/reusing dev
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*/
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static void unlist_netdevice(struct net_device *dev)
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{
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ASSERT_RTNL();
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/* Unlink dev from the device chain */
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write_lock_bh(&dev_base_lock);
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list_del_rcu(&dev->dev_list);
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hlist_del_rcu(&dev->name_hlist);
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hlist_del_rcu(&dev->index_hlist);
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write_unlock_bh(&dev_base_lock);
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dev_base_seq_inc(dev_net(dev));
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}
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/*
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* Our notifier list
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*/
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static RAW_NOTIFIER_HEAD(netdev_chain);
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/*
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* Device drivers call our routines to queue packets here. We empty the
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* queue in the local softnet handler.
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*/
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DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
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EXPORT_PER_CPU_SYMBOL(softnet_data);
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#ifdef CONFIG_LOCKDEP
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/*
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* register_netdevice() inits txq->_xmit_lock and sets lockdep class
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* according to dev->type
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*/
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static const unsigned short netdev_lock_type[] =
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{ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
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ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
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ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
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ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
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ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
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ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
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ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
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ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
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ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
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ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
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ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
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ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
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ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
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ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
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ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
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static const char *const netdev_lock_name[] =
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{"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
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"_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
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"_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
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"_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
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"_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
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"_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
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"_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
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"_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
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"_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
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"_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
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"_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
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"_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
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"_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
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"_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
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"_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
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static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
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static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
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static inline unsigned short netdev_lock_pos(unsigned short dev_type)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
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if (netdev_lock_type[i] == dev_type)
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return i;
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/* the last key is used by default */
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return ARRAY_SIZE(netdev_lock_type) - 1;
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}
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static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
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unsigned short dev_type)
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{
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int i;
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i = netdev_lock_pos(dev_type);
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lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
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netdev_lock_name[i]);
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}
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static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
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{
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int i;
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i = netdev_lock_pos(dev->type);
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lockdep_set_class_and_name(&dev->addr_list_lock,
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&netdev_addr_lock_key[i],
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netdev_lock_name[i]);
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}
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#else
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static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
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unsigned short dev_type)
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{
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}
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static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
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{
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}
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#endif
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|
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/*******************************************************************************
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|
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Protocol management and registration routines
|
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*******************************************************************************/
|
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|
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/*
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* Add a protocol ID to the list. Now that the input handler is
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* smarter we can dispense with all the messy stuff that used to be
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* here.
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*
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* BEWARE!!! Protocol handlers, mangling input packets,
|
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* MUST BE last in hash buckets and checking protocol handlers
|
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* MUST start from promiscuous ptype_all chain in net_bh.
|
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* It is true now, do not change it.
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* Explanation follows: if protocol handler, mangling packet, will
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* be the first on list, it is not able to sense, that packet
|
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* is cloned and should be copied-on-write, so that it will
|
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* change it and subsequent readers will get broken packet.
|
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* --ANK (980803)
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*/
|
|
|
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static inline struct list_head *ptype_head(const struct packet_type *pt)
|
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{
|
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if (pt->type == htons(ETH_P_ALL))
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return &ptype_all;
|
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else
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return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
|
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}
|
|
|
|
/**
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* dev_add_pack - add packet handler
|
|
* @pt: packet type declaration
|
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*
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* Add a protocol handler to the networking stack. The passed &packet_type
|
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* is linked into kernel lists and may not be freed until it has been
|
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* removed from the kernel lists.
|
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*
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* This call does not sleep therefore it can not
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* guarantee all CPU's that are in middle of receiving packets
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* will see the new packet type (until the next received packet).
|
|
*/
|
|
|
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void dev_add_pack(struct packet_type *pt)
|
|
{
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struct list_head *head = ptype_head(pt);
|
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|
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spin_lock(&ptype_lock);
|
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list_add_rcu(&pt->list, head);
|
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spin_unlock(&ptype_lock);
|
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}
|
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EXPORT_SYMBOL(dev_add_pack);
|
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|
|
/**
|
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* __dev_remove_pack - remove packet handler
|
|
* @pt: packet type declaration
|
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*
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* Remove a protocol handler that was previously added to the kernel
|
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* protocol handlers by dev_add_pack(). The passed &packet_type is removed
|
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* from the kernel lists and can be freed or reused once this function
|
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* returns.
|
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*
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* The packet type might still be in use by receivers
|
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* and must not be freed until after all the CPU's have gone
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* through a quiescent state.
|
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*/
|
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void __dev_remove_pack(struct packet_type *pt)
|
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{
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struct list_head *head = ptype_head(pt);
|
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struct packet_type *pt1;
|
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|
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spin_lock(&ptype_lock);
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|
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list_for_each_entry(pt1, head, list) {
|
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if (pt == pt1) {
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list_del_rcu(&pt->list);
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goto out;
|
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}
|
|
}
|
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|
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pr_warn("dev_remove_pack: %p not found\n", pt);
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out:
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spin_unlock(&ptype_lock);
|
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}
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EXPORT_SYMBOL(__dev_remove_pack);
|
|
|
|
/**
|
|
* dev_remove_pack - remove packet handler
|
|
* @pt: packet type declaration
|
|
*
|
|
* Remove a protocol handler that was previously added to the kernel
|
|
* protocol handlers by dev_add_pack(). The passed &packet_type is removed
|
|
* from the kernel lists and can be freed or reused once this function
|
|
* returns.
|
|
*
|
|
* This call sleeps to guarantee that no CPU is looking at the packet
|
|
* type after return.
|
|
*/
|
|
void dev_remove_pack(struct packet_type *pt)
|
|
{
|
|
__dev_remove_pack(pt);
|
|
|
|
synchronize_net();
|
|
}
|
|
EXPORT_SYMBOL(dev_remove_pack);
|
|
|
|
/******************************************************************************
|
|
|
|
Device Boot-time Settings Routines
|
|
|
|
*******************************************************************************/
|
|
|
|
/* Boot time configuration table */
|
|
static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
|
|
|
|
/**
|
|
* netdev_boot_setup_add - add new setup entry
|
|
* @name: name of the device
|
|
* @map: configured settings for the device
|
|
*
|
|
* Adds new setup entry to the dev_boot_setup list. The function
|
|
* returns 0 on error and 1 on success. This is a generic routine to
|
|
* all netdevices.
|
|
*/
|
|
static int netdev_boot_setup_add(char *name, struct ifmap *map)
|
|
{
|
|
struct netdev_boot_setup *s;
|
|
int i;
|
|
|
|
s = dev_boot_setup;
|
|
for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
|
|
if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
|
|
memset(s[i].name, 0, sizeof(s[i].name));
|
|
strlcpy(s[i].name, name, IFNAMSIZ);
|
|
memcpy(&s[i].map, map, sizeof(s[i].map));
|
|
break;
|
|
}
|
|
}
|
|
|
|
return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
|
|
}
|
|
|
|
/**
|
|
* netdev_boot_setup_check - check boot time settings
|
|
* @dev: the netdevice
|
|
*
|
|
* Check boot time settings for the device.
|
|
* The found settings are set for the device to be used
|
|
* later in the device probing.
|
|
* Returns 0 if no settings found, 1 if they are.
|
|
*/
|
|
int netdev_boot_setup_check(struct net_device *dev)
|
|
{
|
|
struct netdev_boot_setup *s = dev_boot_setup;
|
|
int i;
|
|
|
|
for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
|
|
if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
|
|
!strcmp(dev->name, s[i].name)) {
|
|
dev->irq = s[i].map.irq;
|
|
dev->base_addr = s[i].map.base_addr;
|
|
dev->mem_start = s[i].map.mem_start;
|
|
dev->mem_end = s[i].map.mem_end;
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(netdev_boot_setup_check);
|
|
|
|
|
|
/**
|
|
* netdev_boot_base - get address from boot time settings
|
|
* @prefix: prefix for network device
|
|
* @unit: id for network device
|
|
*
|
|
* Check boot time settings for the base address of device.
|
|
* The found settings are set for the device to be used
|
|
* later in the device probing.
|
|
* Returns 0 if no settings found.
|
|
*/
|
|
unsigned long netdev_boot_base(const char *prefix, int unit)
|
|
{
|
|
const struct netdev_boot_setup *s = dev_boot_setup;
|
|
char name[IFNAMSIZ];
|
|
int i;
|
|
|
|
sprintf(name, "%s%d", prefix, unit);
|
|
|
|
/*
|
|
* If device already registered then return base of 1
|
|
* to indicate not to probe for this interface
|
|
*/
|
|
if (__dev_get_by_name(&init_net, name))
|
|
return 1;
|
|
|
|
for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
|
|
if (!strcmp(name, s[i].name))
|
|
return s[i].map.base_addr;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Saves at boot time configured settings for any netdevice.
|
|
*/
|
|
int __init netdev_boot_setup(char *str)
|
|
{
|
|
int ints[5];
|
|
struct ifmap map;
|
|
|
|
str = get_options(str, ARRAY_SIZE(ints), ints);
|
|
if (!str || !*str)
|
|
return 0;
|
|
|
|
/* Save settings */
|
|
memset(&map, 0, sizeof(map));
|
|
if (ints[0] > 0)
|
|
map.irq = ints[1];
|
|
if (ints[0] > 1)
|
|
map.base_addr = ints[2];
|
|
if (ints[0] > 2)
|
|
map.mem_start = ints[3];
|
|
if (ints[0] > 3)
|
|
map.mem_end = ints[4];
|
|
|
|
/* Add new entry to the list */
|
|
return netdev_boot_setup_add(str, &map);
|
|
}
|
|
|
|
__setup("netdev=", netdev_boot_setup);
|
|
|
|
/*******************************************************************************
|
|
|
|
Device Interface Subroutines
|
|
|
|
*******************************************************************************/
|
|
|
|
/**
|
|
* __dev_get_by_name - find a device by its name
|
|
* @net: the applicable net namespace
|
|
* @name: name to find
|
|
*
|
|
* Find an interface by name. Must be called under RTNL semaphore
|
|
* or @dev_base_lock. If the name is found a pointer to the device
|
|
* is returned. If the name is not found then %NULL is returned. The
|
|
* reference counters are not incremented so the caller must be
|
|
* careful with locks.
|
|
*/
|
|
|
|
struct net_device *__dev_get_by_name(struct net *net, const char *name)
|
|
{
|
|
struct hlist_node *p;
|
|
struct net_device *dev;
|
|
struct hlist_head *head = dev_name_hash(net, name);
|
|
|
|
hlist_for_each_entry(dev, p, head, name_hlist)
|
|
if (!strncmp(dev->name, name, IFNAMSIZ))
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(__dev_get_by_name);
|
|
|
|
/**
|
|
* dev_get_by_name_rcu - find a device by its name
|
|
* @net: the applicable net namespace
|
|
* @name: name to find
|
|
*
|
|
* Find an interface by name.
|
|
* If the name is found a pointer to the device is returned.
|
|
* If the name is not found then %NULL is returned.
|
|
* The reference counters are not incremented so the caller must be
|
|
* careful with locks. The caller must hold RCU lock.
|
|
*/
|
|
|
|
struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
|
|
{
|
|
struct hlist_node *p;
|
|
struct net_device *dev;
|
|
struct hlist_head *head = dev_name_hash(net, name);
|
|
|
|
hlist_for_each_entry_rcu(dev, p, head, name_hlist)
|
|
if (!strncmp(dev->name, name, IFNAMSIZ))
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_by_name_rcu);
|
|
|
|
/**
|
|
* dev_get_by_name - find a device by its name
|
|
* @net: the applicable net namespace
|
|
* @name: name to find
|
|
*
|
|
* Find an interface by name. This can be called from any
|
|
* context and does its own locking. The returned handle has
|
|
* the usage count incremented and the caller must use dev_put() to
|
|
* release it when it is no longer needed. %NULL is returned if no
|
|
* matching device is found.
|
|
*/
|
|
|
|
struct net_device *dev_get_by_name(struct net *net, const char *name)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
rcu_read_lock();
|
|
dev = dev_get_by_name_rcu(net, name);
|
|
if (dev)
|
|
dev_hold(dev);
|
|
rcu_read_unlock();
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_by_name);
|
|
|
|
/**
|
|
* __dev_get_by_index - find a device by its ifindex
|
|
* @net: the applicable net namespace
|
|
* @ifindex: index of device
|
|
*
|
|
* Search for an interface by index. Returns %NULL if the device
|
|
* is not found or a pointer to the device. The device has not
|
|
* had its reference counter increased so the caller must be careful
|
|
* about locking. The caller must hold either the RTNL semaphore
|
|
* or @dev_base_lock.
|
|
*/
|
|
|
|
struct net_device *__dev_get_by_index(struct net *net, int ifindex)
|
|
{
|
|
struct hlist_node *p;
|
|
struct net_device *dev;
|
|
struct hlist_head *head = dev_index_hash(net, ifindex);
|
|
|
|
hlist_for_each_entry(dev, p, head, index_hlist)
|
|
if (dev->ifindex == ifindex)
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(__dev_get_by_index);
|
|
|
|
/**
|
|
* dev_get_by_index_rcu - find a device by its ifindex
|
|
* @net: the applicable net namespace
|
|
* @ifindex: index of device
|
|
*
|
|
* Search for an interface by index. Returns %NULL if the device
|
|
* is not found or a pointer to the device. The device has not
|
|
* had its reference counter increased so the caller must be careful
|
|
* about locking. The caller must hold RCU lock.
|
|
*/
|
|
|
|
struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
|
|
{
|
|
struct hlist_node *p;
|
|
struct net_device *dev;
|
|
struct hlist_head *head = dev_index_hash(net, ifindex);
|
|
|
|
hlist_for_each_entry_rcu(dev, p, head, index_hlist)
|
|
if (dev->ifindex == ifindex)
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_by_index_rcu);
|
|
|
|
|
|
/**
|
|
* dev_get_by_index - find a device by its ifindex
|
|
* @net: the applicable net namespace
|
|
* @ifindex: index of device
|
|
*
|
|
* Search for an interface by index. Returns NULL if the device
|
|
* is not found or a pointer to the device. The device returned has
|
|
* had a reference added and the pointer is safe until the user calls
|
|
* dev_put to indicate they have finished with it.
|
|
*/
|
|
|
|
struct net_device *dev_get_by_index(struct net *net, int ifindex)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
rcu_read_lock();
|
|
dev = dev_get_by_index_rcu(net, ifindex);
|
|
if (dev)
|
|
dev_hold(dev);
|
|
rcu_read_unlock();
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_by_index);
|
|
|
|
/**
|
|
* dev_getbyhwaddr_rcu - find a device by its hardware address
|
|
* @net: the applicable net namespace
|
|
* @type: media type of device
|
|
* @ha: hardware address
|
|
*
|
|
* Search for an interface by MAC address. Returns NULL if the device
|
|
* is not found or a pointer to the device.
|
|
* The caller must hold RCU or RTNL.
|
|
* The returned device has not had its ref count increased
|
|
* and the caller must therefore be careful about locking
|
|
*
|
|
*/
|
|
|
|
struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
|
|
const char *ha)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
for_each_netdev_rcu(net, dev)
|
|
if (dev->type == type &&
|
|
!memcmp(dev->dev_addr, ha, dev->addr_len))
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
|
|
|
|
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
ASSERT_RTNL();
|
|
for_each_netdev(net, dev)
|
|
if (dev->type == type)
|
|
return dev;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(__dev_getfirstbyhwtype);
|
|
|
|
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
|
|
{
|
|
struct net_device *dev, *ret = NULL;
|
|
|
|
rcu_read_lock();
|
|
for_each_netdev_rcu(net, dev)
|
|
if (dev->type == type) {
|
|
dev_hold(dev);
|
|
ret = dev;
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dev_getfirstbyhwtype);
|
|
|
|
/**
|
|
* dev_get_by_flags_rcu - find any device with given flags
|
|
* @net: the applicable net namespace
|
|
* @if_flags: IFF_* values
|
|
* @mask: bitmask of bits in if_flags to check
|
|
*
|
|
* Search for any interface with the given flags. Returns NULL if a device
|
|
* is not found or a pointer to the device. Must be called inside
|
|
* rcu_read_lock(), and result refcount is unchanged.
|
|
*/
|
|
|
|
struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
|
|
unsigned short mask)
|
|
{
|
|
struct net_device *dev, *ret;
|
|
|
|
ret = NULL;
|
|
for_each_netdev_rcu(net, dev) {
|
|
if (((dev->flags ^ if_flags) & mask) == 0) {
|
|
ret = dev;
|
|
break;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_by_flags_rcu);
|
|
|
|
/**
|
|
* dev_valid_name - check if name is okay for network device
|
|
* @name: name string
|
|
*
|
|
* Network device names need to be valid file names to
|
|
* to allow sysfs to work. We also disallow any kind of
|
|
* whitespace.
|
|
*/
|
|
bool dev_valid_name(const char *name)
|
|
{
|
|
if (*name == '\0')
|
|
return false;
|
|
if (strlen(name) >= IFNAMSIZ)
|
|
return false;
|
|
if (!strcmp(name, ".") || !strcmp(name, ".."))
|
|
return false;
|
|
|
|
while (*name) {
|
|
if (*name == '/' || isspace(*name))
|
|
return false;
|
|
name++;
|
|
}
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(dev_valid_name);
|
|
|
|
/**
|
|
* __dev_alloc_name - allocate a name for a device
|
|
* @net: network namespace to allocate the device name in
|
|
* @name: name format string
|
|
* @buf: scratch buffer and result name string
|
|
*
|
|
* Passed a format string - eg "lt%d" it will try and find a suitable
|
|
* id. It scans list of devices to build up a free map, then chooses
|
|
* the first empty slot. The caller must hold the dev_base or rtnl lock
|
|
* while allocating the name and adding the device in order to avoid
|
|
* duplicates.
|
|
* Limited to bits_per_byte * page size devices (ie 32K on most platforms).
|
|
* Returns the number of the unit assigned or a negative errno code.
|
|
*/
|
|
|
|
static int __dev_alloc_name(struct net *net, const char *name, char *buf)
|
|
{
|
|
int i = 0;
|
|
const char *p;
|
|
const int max_netdevices = 8*PAGE_SIZE;
|
|
unsigned long *inuse;
|
|
struct net_device *d;
|
|
|
|
p = strnchr(name, IFNAMSIZ-1, '%');
|
|
if (p) {
|
|
/*
|
|
* Verify the string as this thing may have come from
|
|
* the user. There must be either one "%d" and no other "%"
|
|
* characters.
|
|
*/
|
|
if (p[1] != 'd' || strchr(p + 2, '%'))
|
|
return -EINVAL;
|
|
|
|
/* Use one page as a bit array of possible slots */
|
|
inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
|
|
if (!inuse)
|
|
return -ENOMEM;
|
|
|
|
for_each_netdev(net, d) {
|
|
if (!sscanf(d->name, name, &i))
|
|
continue;
|
|
if (i < 0 || i >= max_netdevices)
|
|
continue;
|
|
|
|
/* avoid cases where sscanf is not exact inverse of printf */
|
|
snprintf(buf, IFNAMSIZ, name, i);
|
|
if (!strncmp(buf, d->name, IFNAMSIZ))
|
|
set_bit(i, inuse);
|
|
}
|
|
|
|
i = find_first_zero_bit(inuse, max_netdevices);
|
|
free_page((unsigned long) inuse);
|
|
}
|
|
|
|
if (buf != name)
|
|
snprintf(buf, IFNAMSIZ, name, i);
|
|
if (!__dev_get_by_name(net, buf))
|
|
return i;
|
|
|
|
/* It is possible to run out of possible slots
|
|
* when the name is long and there isn't enough space left
|
|
* for the digits, or if all bits are used.
|
|
*/
|
|
return -ENFILE;
|
|
}
|
|
|
|
/**
|
|
* dev_alloc_name - allocate a name for a device
|
|
* @dev: device
|
|
* @name: name format string
|
|
*
|
|
* Passed a format string - eg "lt%d" it will try and find a suitable
|
|
* id. It scans list of devices to build up a free map, then chooses
|
|
* the first empty slot. The caller must hold the dev_base or rtnl lock
|
|
* while allocating the name and adding the device in order to avoid
|
|
* duplicates.
|
|
* Limited to bits_per_byte * page size devices (ie 32K on most platforms).
|
|
* Returns the number of the unit assigned or a negative errno code.
|
|
*/
|
|
|
|
int dev_alloc_name(struct net_device *dev, const char *name)
|
|
{
|
|
char buf[IFNAMSIZ];
|
|
struct net *net;
|
|
int ret;
|
|
|
|
BUG_ON(!dev_net(dev));
|
|
net = dev_net(dev);
|
|
ret = __dev_alloc_name(net, name, buf);
|
|
if (ret >= 0)
|
|
strlcpy(dev->name, buf, IFNAMSIZ);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dev_alloc_name);
|
|
|
|
static int dev_get_valid_name(struct net_device *dev, const char *name)
|
|
{
|
|
struct net *net;
|
|
|
|
BUG_ON(!dev_net(dev));
|
|
net = dev_net(dev);
|
|
|
|
if (!dev_valid_name(name))
|
|
return -EINVAL;
|
|
|
|
if (strchr(name, '%'))
|
|
return dev_alloc_name(dev, name);
|
|
else if (__dev_get_by_name(net, name))
|
|
return -EEXIST;
|
|
else if (dev->name != name)
|
|
strlcpy(dev->name, name, IFNAMSIZ);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dev_change_name - change name of a device
|
|
* @dev: device
|
|
* @newname: name (or format string) must be at least IFNAMSIZ
|
|
*
|
|
* Change name of a device, can pass format strings "eth%d".
|
|
* for wildcarding.
|
|
*/
|
|
int dev_change_name(struct net_device *dev, const char *newname)
|
|
{
|
|
char oldname[IFNAMSIZ];
|
|
int err = 0;
|
|
int ret;
|
|
struct net *net;
|
|
|
|
ASSERT_RTNL();
|
|
BUG_ON(!dev_net(dev));
|
|
|
|
net = dev_net(dev);
|
|
if (dev->flags & IFF_UP)
|
|
return -EBUSY;
|
|
|
|
if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
|
|
return 0;
|
|
|
|
memcpy(oldname, dev->name, IFNAMSIZ);
|
|
|
|
err = dev_get_valid_name(dev, newname);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
rollback:
|
|
ret = device_rename(&dev->dev, dev->name);
|
|
if (ret) {
|
|
memcpy(dev->name, oldname, IFNAMSIZ);
|
|
return ret;
|
|
}
|
|
|
|
write_lock_bh(&dev_base_lock);
|
|
hlist_del_rcu(&dev->name_hlist);
|
|
write_unlock_bh(&dev_base_lock);
|
|
|
|
synchronize_rcu();
|
|
|
|
write_lock_bh(&dev_base_lock);
|
|
hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
|
|
write_unlock_bh(&dev_base_lock);
|
|
|
|
ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
|
|
ret = notifier_to_errno(ret);
|
|
|
|
if (ret) {
|
|
/* err >= 0 after dev_alloc_name() or stores the first errno */
|
|
if (err >= 0) {
|
|
err = ret;
|
|
memcpy(dev->name, oldname, IFNAMSIZ);
|
|
goto rollback;
|
|
} else {
|
|
pr_err("%s: name change rollback failed: %d\n",
|
|
dev->name, ret);
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* dev_set_alias - change ifalias of a device
|
|
* @dev: device
|
|
* @alias: name up to IFALIASZ
|
|
* @len: limit of bytes to copy from info
|
|
*
|
|
* Set ifalias for a device,
|
|
*/
|
|
int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
if (len >= IFALIASZ)
|
|
return -EINVAL;
|
|
|
|
if (!len) {
|
|
if (dev->ifalias) {
|
|
kfree(dev->ifalias);
|
|
dev->ifalias = NULL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
|
|
if (!dev->ifalias)
|
|
return -ENOMEM;
|
|
|
|
strlcpy(dev->ifalias, alias, len+1);
|
|
return len;
|
|
}
|
|
|
|
|
|
/**
|
|
* netdev_features_change - device changes features
|
|
* @dev: device to cause notification
|
|
*
|
|
* Called to indicate a device has changed features.
|
|
*/
|
|
void netdev_features_change(struct net_device *dev)
|
|
{
|
|
call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
|
|
}
|
|
EXPORT_SYMBOL(netdev_features_change);
|
|
|
|
/**
|
|
* netdev_state_change - device changes state
|
|
* @dev: device to cause notification
|
|
*
|
|
* Called to indicate a device has changed state. This function calls
|
|
* the notifier chains for netdev_chain and sends a NEWLINK message
|
|
* to the routing socket.
|
|
*/
|
|
void netdev_state_change(struct net_device *dev)
|
|
{
|
|
if (dev->flags & IFF_UP) {
|
|
call_netdevice_notifiers(NETDEV_CHANGE, dev);
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(netdev_state_change);
|
|
|
|
int netdev_bonding_change(struct net_device *dev, unsigned long event)
|
|
{
|
|
return call_netdevice_notifiers(event, dev);
|
|
}
|
|
EXPORT_SYMBOL(netdev_bonding_change);
|
|
|
|
/**
|
|
* dev_load - load a network module
|
|
* @net: the applicable net namespace
|
|
* @name: name of interface
|
|
*
|
|
* If a network interface is not present and the process has suitable
|
|
* privileges this function loads the module. If module loading is not
|
|
* available in this kernel then it becomes a nop.
|
|
*/
|
|
|
|
void dev_load(struct net *net, const char *name)
|
|
{
|
|
struct net_device *dev;
|
|
int no_module;
|
|
|
|
rcu_read_lock();
|
|
dev = dev_get_by_name_rcu(net, name);
|
|
rcu_read_unlock();
|
|
|
|
no_module = !dev;
|
|
if (no_module && capable(CAP_NET_ADMIN))
|
|
no_module = request_module("netdev-%s", name);
|
|
if (no_module && capable(CAP_SYS_MODULE)) {
|
|
if (!request_module("%s", name))
|
|
pr_err("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
|
|
name);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(dev_load);
|
|
|
|
static int __dev_open(struct net_device *dev)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
int ret;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
|
|
ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
|
|
ret = notifier_to_errno(ret);
|
|
if (ret)
|
|
return ret;
|
|
|
|
set_bit(__LINK_STATE_START, &dev->state);
|
|
|
|
if (ops->ndo_validate_addr)
|
|
ret = ops->ndo_validate_addr(dev);
|
|
|
|
if (!ret && ops->ndo_open)
|
|
ret = ops->ndo_open(dev);
|
|
|
|
if (ret)
|
|
clear_bit(__LINK_STATE_START, &dev->state);
|
|
else {
|
|
dev->flags |= IFF_UP;
|
|
net_dmaengine_get();
|
|
dev_set_rx_mode(dev);
|
|
dev_activate(dev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* dev_open - prepare an interface for use.
|
|
* @dev: device to open
|
|
*
|
|
* Takes a device from down to up state. The device's private open
|
|
* function is invoked and then the multicast lists are loaded. Finally
|
|
* the device is moved into the up state and a %NETDEV_UP message is
|
|
* sent to the netdev notifier chain.
|
|
*
|
|
* Calling this function on an active interface is a nop. On a failure
|
|
* a negative errno code is returned.
|
|
*/
|
|
int dev_open(struct net_device *dev)
|
|
{
|
|
int ret;
|
|
|
|
if (dev->flags & IFF_UP)
|
|
return 0;
|
|
|
|
ret = __dev_open(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
|
|
call_netdevice_notifiers(NETDEV_UP, dev);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dev_open);
|
|
|
|
static int __dev_close_many(struct list_head *head)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
ASSERT_RTNL();
|
|
might_sleep();
|
|
|
|
list_for_each_entry(dev, head, unreg_list) {
|
|
call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
|
|
|
|
clear_bit(__LINK_STATE_START, &dev->state);
|
|
|
|
/* Synchronize to scheduled poll. We cannot touch poll list, it
|
|
* can be even on different cpu. So just clear netif_running().
|
|
*
|
|
* dev->stop() will invoke napi_disable() on all of it's
|
|
* napi_struct instances on this device.
|
|
*/
|
|
smp_mb__after_clear_bit(); /* Commit netif_running(). */
|
|
}
|
|
|
|
dev_deactivate_many(head);
|
|
|
|
list_for_each_entry(dev, head, unreg_list) {
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
/*
|
|
* Call the device specific close. This cannot fail.
|
|
* Only if device is UP
|
|
*
|
|
* We allow it to be called even after a DETACH hot-plug
|
|
* event.
|
|
*/
|
|
if (ops->ndo_stop)
|
|
ops->ndo_stop(dev);
|
|
|
|
dev->flags &= ~IFF_UP;
|
|
net_dmaengine_put();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __dev_close(struct net_device *dev)
|
|
{
|
|
int retval;
|
|
LIST_HEAD(single);
|
|
|
|
list_add(&dev->unreg_list, &single);
|
|
retval = __dev_close_many(&single);
|
|
list_del(&single);
|
|
return retval;
|
|
}
|
|
|
|
static int dev_close_many(struct list_head *head)
|
|
{
|
|
struct net_device *dev, *tmp;
|
|
LIST_HEAD(tmp_list);
|
|
|
|
list_for_each_entry_safe(dev, tmp, head, unreg_list)
|
|
if (!(dev->flags & IFF_UP))
|
|
list_move(&dev->unreg_list, &tmp_list);
|
|
|
|
__dev_close_many(head);
|
|
|
|
list_for_each_entry(dev, head, unreg_list) {
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
|
|
call_netdevice_notifiers(NETDEV_DOWN, dev);
|
|
}
|
|
|
|
/* rollback_registered_many needs the complete original list */
|
|
list_splice(&tmp_list, head);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dev_close - shutdown an interface.
|
|
* @dev: device to shutdown
|
|
*
|
|
* This function moves an active device into down state. A
|
|
* %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
|
|
* is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
|
|
* chain.
|
|
*/
|
|
int dev_close(struct net_device *dev)
|
|
{
|
|
if (dev->flags & IFF_UP) {
|
|
LIST_HEAD(single);
|
|
|
|
list_add(&dev->unreg_list, &single);
|
|
dev_close_many(&single);
|
|
list_del(&single);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dev_close);
|
|
|
|
|
|
/**
|
|
* dev_disable_lro - disable Large Receive Offload on a device
|
|
* @dev: device
|
|
*
|
|
* Disable Large Receive Offload (LRO) on a net device. Must be
|
|
* called under RTNL. This is needed if received packets may be
|
|
* forwarded to another interface.
|
|
*/
|
|
void dev_disable_lro(struct net_device *dev)
|
|
{
|
|
/*
|
|
* If we're trying to disable lro on a vlan device
|
|
* use the underlying physical device instead
|
|
*/
|
|
if (is_vlan_dev(dev))
|
|
dev = vlan_dev_real_dev(dev);
|
|
|
|
dev->wanted_features &= ~NETIF_F_LRO;
|
|
netdev_update_features(dev);
|
|
|
|
if (unlikely(dev->features & NETIF_F_LRO))
|
|
netdev_WARN(dev, "failed to disable LRO!\n");
|
|
}
|
|
EXPORT_SYMBOL(dev_disable_lro);
|
|
|
|
|
|
static int dev_boot_phase = 1;
|
|
|
|
/**
|
|
* register_netdevice_notifier - register a network notifier block
|
|
* @nb: notifier
|
|
*
|
|
* Register a notifier to be called when network device events occur.
|
|
* The notifier passed is linked into the kernel structures and must
|
|
* not be reused until it has been unregistered. A negative errno code
|
|
* is returned on a failure.
|
|
*
|
|
* When registered all registration and up events are replayed
|
|
* to the new notifier to allow device to have a race free
|
|
* view of the network device list.
|
|
*/
|
|
|
|
int register_netdevice_notifier(struct notifier_block *nb)
|
|
{
|
|
struct net_device *dev;
|
|
struct net_device *last;
|
|
struct net *net;
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = raw_notifier_chain_register(&netdev_chain, nb);
|
|
if (err)
|
|
goto unlock;
|
|
if (dev_boot_phase)
|
|
goto unlock;
|
|
for_each_net(net) {
|
|
for_each_netdev(net, dev) {
|
|
err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
|
|
err = notifier_to_errno(err);
|
|
if (err)
|
|
goto rollback;
|
|
|
|
if (!(dev->flags & IFF_UP))
|
|
continue;
|
|
|
|
nb->notifier_call(nb, NETDEV_UP, dev);
|
|
}
|
|
}
|
|
|
|
unlock:
|
|
rtnl_unlock();
|
|
return err;
|
|
|
|
rollback:
|
|
last = dev;
|
|
for_each_net(net) {
|
|
for_each_netdev(net, dev) {
|
|
if (dev == last)
|
|
goto outroll;
|
|
|
|
if (dev->flags & IFF_UP) {
|
|
nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
|
|
nb->notifier_call(nb, NETDEV_DOWN, dev);
|
|
}
|
|
nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
|
|
nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
|
|
}
|
|
}
|
|
|
|
outroll:
|
|
raw_notifier_chain_unregister(&netdev_chain, nb);
|
|
goto unlock;
|
|
}
|
|
EXPORT_SYMBOL(register_netdevice_notifier);
|
|
|
|
/**
|
|
* unregister_netdevice_notifier - unregister a network notifier block
|
|
* @nb: notifier
|
|
*
|
|
* Unregister a notifier previously registered by
|
|
* register_netdevice_notifier(). The notifier is unlinked into the
|
|
* kernel structures and may then be reused. A negative errno code
|
|
* is returned on a failure.
|
|
*
|
|
* After unregistering unregister and down device events are synthesized
|
|
* for all devices on the device list to the removed notifier to remove
|
|
* the need for special case cleanup code.
|
|
*/
|
|
|
|
int unregister_netdevice_notifier(struct notifier_block *nb)
|
|
{
|
|
struct net_device *dev;
|
|
struct net *net;
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = raw_notifier_chain_unregister(&netdev_chain, nb);
|
|
if (err)
|
|
goto unlock;
|
|
|
|
for_each_net(net) {
|
|
for_each_netdev(net, dev) {
|
|
if (dev->flags & IFF_UP) {
|
|
nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
|
|
nb->notifier_call(nb, NETDEV_DOWN, dev);
|
|
}
|
|
nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
|
|
nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
|
|
}
|
|
}
|
|
unlock:
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(unregister_netdevice_notifier);
|
|
|
|
/**
|
|
* call_netdevice_notifiers - call all network notifier blocks
|
|
* @val: value passed unmodified to notifier function
|
|
* @dev: net_device pointer passed unmodified to notifier function
|
|
*
|
|
* Call all network notifier blocks. Parameters and return value
|
|
* are as for raw_notifier_call_chain().
|
|
*/
|
|
|
|
int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
|
|
{
|
|
ASSERT_RTNL();
|
|
return raw_notifier_call_chain(&netdev_chain, val, dev);
|
|
}
|
|
EXPORT_SYMBOL(call_netdevice_notifiers);
|
|
|
|
static struct static_key netstamp_needed __read_mostly;
|
|
#ifdef HAVE_JUMP_LABEL
|
|
/* We are not allowed to call static_key_slow_dec() from irq context
|
|
* If net_disable_timestamp() is called from irq context, defer the
|
|
* static_key_slow_dec() calls.
|
|
*/
|
|
static atomic_t netstamp_needed_deferred;
|
|
#endif
|
|
|
|
void net_enable_timestamp(void)
|
|
{
|
|
#ifdef HAVE_JUMP_LABEL
|
|
int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
|
|
|
|
if (deferred) {
|
|
while (--deferred)
|
|
static_key_slow_dec(&netstamp_needed);
|
|
return;
|
|
}
|
|
#endif
|
|
WARN_ON(in_interrupt());
|
|
static_key_slow_inc(&netstamp_needed);
|
|
}
|
|
EXPORT_SYMBOL(net_enable_timestamp);
|
|
|
|
void net_disable_timestamp(void)
|
|
{
|
|
#ifdef HAVE_JUMP_LABEL
|
|
if (in_interrupt()) {
|
|
atomic_inc(&netstamp_needed_deferred);
|
|
return;
|
|
}
|
|
#endif
|
|
static_key_slow_dec(&netstamp_needed);
|
|
}
|
|
EXPORT_SYMBOL(net_disable_timestamp);
|
|
|
|
static inline void net_timestamp_set(struct sk_buff *skb)
|
|
{
|
|
skb->tstamp.tv64 = 0;
|
|
if (static_key_false(&netstamp_needed))
|
|
__net_timestamp(skb);
|
|
}
|
|
|
|
#define net_timestamp_check(COND, SKB) \
|
|
if (static_key_false(&netstamp_needed)) { \
|
|
if ((COND) && !(SKB)->tstamp.tv64) \
|
|
__net_timestamp(SKB); \
|
|
} \
|
|
|
|
static int net_hwtstamp_validate(struct ifreq *ifr)
|
|
{
|
|
struct hwtstamp_config cfg;
|
|
enum hwtstamp_tx_types tx_type;
|
|
enum hwtstamp_rx_filters rx_filter;
|
|
int tx_type_valid = 0;
|
|
int rx_filter_valid = 0;
|
|
|
|
if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
|
|
return -EFAULT;
|
|
|
|
if (cfg.flags) /* reserved for future extensions */
|
|
return -EINVAL;
|
|
|
|
tx_type = cfg.tx_type;
|
|
rx_filter = cfg.rx_filter;
|
|
|
|
switch (tx_type) {
|
|
case HWTSTAMP_TX_OFF:
|
|
case HWTSTAMP_TX_ON:
|
|
case HWTSTAMP_TX_ONESTEP_SYNC:
|
|
tx_type_valid = 1;
|
|
break;
|
|
}
|
|
|
|
switch (rx_filter) {
|
|
case HWTSTAMP_FILTER_NONE:
|
|
case HWTSTAMP_FILTER_ALL:
|
|
case HWTSTAMP_FILTER_SOME:
|
|
case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
|
|
case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
|
|
case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
|
|
case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
|
|
case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
|
|
case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
|
|
case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
|
|
case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
|
|
case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
|
|
case HWTSTAMP_FILTER_PTP_V2_EVENT:
|
|
case HWTSTAMP_FILTER_PTP_V2_SYNC:
|
|
case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
|
|
rx_filter_valid = 1;
|
|
break;
|
|
}
|
|
|
|
if (!tx_type_valid || !rx_filter_valid)
|
|
return -ERANGE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline bool is_skb_forwardable(struct net_device *dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
unsigned int len;
|
|
|
|
if (!(dev->flags & IFF_UP))
|
|
return false;
|
|
|
|
len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
|
|
if (skb->len <= len)
|
|
return true;
|
|
|
|
/* if TSO is enabled, we don't care about the length as the packet
|
|
* could be forwarded without being segmented before
|
|
*/
|
|
if (skb_is_gso(skb))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* dev_forward_skb - loopback an skb to another netif
|
|
*
|
|
* @dev: destination network device
|
|
* @skb: buffer to forward
|
|
*
|
|
* return values:
|
|
* NET_RX_SUCCESS (no congestion)
|
|
* NET_RX_DROP (packet was dropped, but freed)
|
|
*
|
|
* dev_forward_skb can be used for injecting an skb from the
|
|
* start_xmit function of one device into the receive queue
|
|
* of another device.
|
|
*
|
|
* The receiving device may be in another namespace, so
|
|
* we have to clear all information in the skb that could
|
|
* impact namespace isolation.
|
|
*/
|
|
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
|
|
{
|
|
if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
|
|
if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
|
|
atomic_long_inc(&dev->rx_dropped);
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
}
|
|
|
|
skb_orphan(skb);
|
|
nf_reset(skb);
|
|
|
|
if (unlikely(!is_skb_forwardable(dev, skb))) {
|
|
atomic_long_inc(&dev->rx_dropped);
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
skb->skb_iif = 0;
|
|
skb->dev = dev;
|
|
skb_dst_drop(skb);
|
|
skb->tstamp.tv64 = 0;
|
|
skb->pkt_type = PACKET_HOST;
|
|
skb->protocol = eth_type_trans(skb, dev);
|
|
skb->mark = 0;
|
|
secpath_reset(skb);
|
|
nf_reset(skb);
|
|
return netif_rx(skb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_forward_skb);
|
|
|
|
static inline int deliver_skb(struct sk_buff *skb,
|
|
struct packet_type *pt_prev,
|
|
struct net_device *orig_dev)
|
|
{
|
|
atomic_inc(&skb->users);
|
|
return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
|
|
}
|
|
|
|
/*
|
|
* Support routine. Sends outgoing frames to any network
|
|
* taps currently in use.
|
|
*/
|
|
|
|
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct packet_type *ptype;
|
|
struct sk_buff *skb2 = NULL;
|
|
struct packet_type *pt_prev = NULL;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(ptype, &ptype_all, list) {
|
|
/* Never send packets back to the socket
|
|
* they originated from - MvS (miquels@drinkel.ow.org)
|
|
*/
|
|
if ((ptype->dev == dev || !ptype->dev) &&
|
|
(ptype->af_packet_priv == NULL ||
|
|
(struct sock *)ptype->af_packet_priv != skb->sk)) {
|
|
if (pt_prev) {
|
|
deliver_skb(skb2, pt_prev, skb->dev);
|
|
pt_prev = ptype;
|
|
continue;
|
|
}
|
|
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb2)
|
|
break;
|
|
|
|
net_timestamp_set(skb2);
|
|
|
|
/* skb->nh should be correctly
|
|
set by sender, so that the second statement is
|
|
just protection against buggy protocols.
|
|
*/
|
|
skb_reset_mac_header(skb2);
|
|
|
|
if (skb_network_header(skb2) < skb2->data ||
|
|
skb2->network_header > skb2->tail) {
|
|
net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
|
|
ntohs(skb2->protocol),
|
|
dev->name);
|
|
skb_reset_network_header(skb2);
|
|
}
|
|
|
|
skb2->transport_header = skb2->network_header;
|
|
skb2->pkt_type = PACKET_OUTGOING;
|
|
pt_prev = ptype;
|
|
}
|
|
}
|
|
if (pt_prev)
|
|
pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
|
|
* @dev: Network device
|
|
* @txq: number of queues available
|
|
*
|
|
* If real_num_tx_queues is changed the tc mappings may no longer be
|
|
* valid. To resolve this verify the tc mapping remains valid and if
|
|
* not NULL the mapping. With no priorities mapping to this
|
|
* offset/count pair it will no longer be used. In the worst case TC0
|
|
* is invalid nothing can be done so disable priority mappings. If is
|
|
* expected that drivers will fix this mapping if they can before
|
|
* calling netif_set_real_num_tx_queues.
|
|
*/
|
|
static void netif_setup_tc(struct net_device *dev, unsigned int txq)
|
|
{
|
|
int i;
|
|
struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
|
|
|
|
/* If TC0 is invalidated disable TC mapping */
|
|
if (tc->offset + tc->count > txq) {
|
|
pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
|
|
dev->num_tc = 0;
|
|
return;
|
|
}
|
|
|
|
/* Invalidated prio to tc mappings set to TC0 */
|
|
for (i = 1; i < TC_BITMASK + 1; i++) {
|
|
int q = netdev_get_prio_tc_map(dev, i);
|
|
|
|
tc = &dev->tc_to_txq[q];
|
|
if (tc->offset + tc->count > txq) {
|
|
pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
|
|
i, q);
|
|
netdev_set_prio_tc_map(dev, i, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
|
|
* greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
|
|
*/
|
|
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
|
|
{
|
|
int rc;
|
|
|
|
if (txq < 1 || txq > dev->num_tx_queues)
|
|
return -EINVAL;
|
|
|
|
if (dev->reg_state == NETREG_REGISTERED ||
|
|
dev->reg_state == NETREG_UNREGISTERING) {
|
|
ASSERT_RTNL();
|
|
|
|
rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
|
|
txq);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (dev->num_tc)
|
|
netif_setup_tc(dev, txq);
|
|
|
|
if (txq < dev->real_num_tx_queues)
|
|
qdisc_reset_all_tx_gt(dev, txq);
|
|
}
|
|
|
|
dev->real_num_tx_queues = txq;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(netif_set_real_num_tx_queues);
|
|
|
|
#ifdef CONFIG_RPS
|
|
/**
|
|
* netif_set_real_num_rx_queues - set actual number of RX queues used
|
|
* @dev: Network device
|
|
* @rxq: Actual number of RX queues
|
|
*
|
|
* This must be called either with the rtnl_lock held or before
|
|
* registration of the net device. Returns 0 on success, or a
|
|
* negative error code. If called before registration, it always
|
|
* succeeds.
|
|
*/
|
|
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
|
|
{
|
|
int rc;
|
|
|
|
if (rxq < 1 || rxq > dev->num_rx_queues)
|
|
return -EINVAL;
|
|
|
|
if (dev->reg_state == NETREG_REGISTERED) {
|
|
ASSERT_RTNL();
|
|
|
|
rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
|
|
rxq);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
dev->real_num_rx_queues = rxq;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(netif_set_real_num_rx_queues);
|
|
#endif
|
|
|
|
static inline void __netif_reschedule(struct Qdisc *q)
|
|
{
|
|
struct softnet_data *sd;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
sd = &__get_cpu_var(softnet_data);
|
|
q->next_sched = NULL;
|
|
*sd->output_queue_tailp = q;
|
|
sd->output_queue_tailp = &q->next_sched;
|
|
raise_softirq_irqoff(NET_TX_SOFTIRQ);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
void __netif_schedule(struct Qdisc *q)
|
|
{
|
|
if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
|
|
__netif_reschedule(q);
|
|
}
|
|
EXPORT_SYMBOL(__netif_schedule);
|
|
|
|
void dev_kfree_skb_irq(struct sk_buff *skb)
|
|
{
|
|
if (atomic_dec_and_test(&skb->users)) {
|
|
struct softnet_data *sd;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
sd = &__get_cpu_var(softnet_data);
|
|
skb->next = sd->completion_queue;
|
|
sd->completion_queue = skb;
|
|
raise_softirq_irqoff(NET_TX_SOFTIRQ);
|
|
local_irq_restore(flags);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(dev_kfree_skb_irq);
|
|
|
|
void dev_kfree_skb_any(struct sk_buff *skb)
|
|
{
|
|
if (in_irq() || irqs_disabled())
|
|
dev_kfree_skb_irq(skb);
|
|
else
|
|
dev_kfree_skb(skb);
|
|
}
|
|
EXPORT_SYMBOL(dev_kfree_skb_any);
|
|
|
|
|
|
/**
|
|
* netif_device_detach - mark device as removed
|
|
* @dev: network device
|
|
*
|
|
* Mark device as removed from system and therefore no longer available.
|
|
*/
|
|
void netif_device_detach(struct net_device *dev)
|
|
{
|
|
if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
|
|
netif_running(dev)) {
|
|
netif_tx_stop_all_queues(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(netif_device_detach);
|
|
|
|
/**
|
|
* netif_device_attach - mark device as attached
|
|
* @dev: network device
|
|
*
|
|
* Mark device as attached from system and restart if needed.
|
|
*/
|
|
void netif_device_attach(struct net_device *dev)
|
|
{
|
|
if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
|
|
netif_running(dev)) {
|
|
netif_tx_wake_all_queues(dev);
|
|
__netdev_watchdog_up(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(netif_device_attach);
|
|
|
|
static void skb_warn_bad_offload(const struct sk_buff *skb)
|
|
{
|
|
static const netdev_features_t null_features = 0;
|
|
struct net_device *dev = skb->dev;
|
|
const char *driver = "";
|
|
|
|
if (dev && dev->dev.parent)
|
|
driver = dev_driver_string(dev->dev.parent);
|
|
|
|
WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
|
|
"gso_type=%d ip_summed=%d\n",
|
|
driver, dev ? &dev->features : &null_features,
|
|
skb->sk ? &skb->sk->sk_route_caps : &null_features,
|
|
skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
|
|
skb_shinfo(skb)->gso_type, skb->ip_summed);
|
|
}
|
|
|
|
/*
|
|
* Invalidate hardware checksum when packet is to be mangled, and
|
|
* complete checksum manually on outgoing path.
|
|
*/
|
|
int skb_checksum_help(struct sk_buff *skb)
|
|
{
|
|
__wsum csum;
|
|
int ret = 0, offset;
|
|
|
|
if (skb->ip_summed == CHECKSUM_COMPLETE)
|
|
goto out_set_summed;
|
|
|
|
if (unlikely(skb_shinfo(skb)->gso_size)) {
|
|
skb_warn_bad_offload(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
offset = skb_checksum_start_offset(skb);
|
|
BUG_ON(offset >= skb_headlen(skb));
|
|
csum = skb_checksum(skb, offset, skb->len - offset, 0);
|
|
|
|
offset += skb->csum_offset;
|
|
BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
|
|
|
|
if (skb_cloned(skb) &&
|
|
!skb_clone_writable(skb, offset + sizeof(__sum16))) {
|
|
ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
*(__sum16 *)(skb->data + offset) = csum_fold(csum);
|
|
out_set_summed:
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(skb_checksum_help);
|
|
|
|
/**
|
|
* skb_gso_segment - Perform segmentation on skb.
|
|
* @skb: buffer to segment
|
|
* @features: features for the output path (see dev->features)
|
|
*
|
|
* This function segments the given skb and returns a list of segments.
|
|
*
|
|
* It may return NULL if the skb requires no segmentation. This is
|
|
* only possible when GSO is used for verifying header integrity.
|
|
*/
|
|
struct sk_buff *skb_gso_segment(struct sk_buff *skb,
|
|
netdev_features_t features)
|
|
{
|
|
struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
|
|
struct packet_type *ptype;
|
|
__be16 type = skb->protocol;
|
|
int vlan_depth = ETH_HLEN;
|
|
int err;
|
|
|
|
while (type == htons(ETH_P_8021Q)) {
|
|
struct vlan_hdr *vh;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
vh = (struct vlan_hdr *)(skb->data + vlan_depth);
|
|
type = vh->h_vlan_encapsulated_proto;
|
|
vlan_depth += VLAN_HLEN;
|
|
}
|
|
|
|
skb_reset_mac_header(skb);
|
|
skb->mac_len = skb->network_header - skb->mac_header;
|
|
__skb_pull(skb, skb->mac_len);
|
|
|
|
if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
|
|
skb_warn_bad_offload(skb);
|
|
|
|
if (skb_header_cloned(skb) &&
|
|
(err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(ptype,
|
|
&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
|
|
if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
|
|
if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
|
|
err = ptype->gso_send_check(skb);
|
|
segs = ERR_PTR(err);
|
|
if (err || skb_gso_ok(skb, features))
|
|
break;
|
|
__skb_push(skb, (skb->data -
|
|
skb_network_header(skb)));
|
|
}
|
|
segs = ptype->gso_segment(skb, features);
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
__skb_push(skb, skb->data - skb_mac_header(skb));
|
|
|
|
return segs;
|
|
}
|
|
EXPORT_SYMBOL(skb_gso_segment);
|
|
|
|
/* Take action when hardware reception checksum errors are detected. */
|
|
#ifdef CONFIG_BUG
|
|
void netdev_rx_csum_fault(struct net_device *dev)
|
|
{
|
|
if (net_ratelimit()) {
|
|
pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
|
|
dump_stack();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(netdev_rx_csum_fault);
|
|
#endif
|
|
|
|
/* Actually, we should eliminate this check as soon as we know, that:
|
|
* 1. IOMMU is present and allows to map all the memory.
|
|
* 2. No high memory really exists on this machine.
|
|
*/
|
|
|
|
static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
|
|
{
|
|
#ifdef CONFIG_HIGHMEM
|
|
int i;
|
|
if (!(dev->features & NETIF_F_HIGHDMA)) {
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
|
if (PageHighMem(skb_frag_page(frag)))
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (PCI_DMA_BUS_IS_PHYS) {
|
|
struct device *pdev = dev->dev.parent;
|
|
|
|
if (!pdev)
|
|
return 0;
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
|
dma_addr_t addr = page_to_phys(skb_frag_page(frag));
|
|
if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
|
|
return 1;
|
|
}
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
struct dev_gso_cb {
|
|
void (*destructor)(struct sk_buff *skb);
|
|
};
|
|
|
|
#define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
|
|
|
|
static void dev_gso_skb_destructor(struct sk_buff *skb)
|
|
{
|
|
struct dev_gso_cb *cb;
|
|
|
|
do {
|
|
struct sk_buff *nskb = skb->next;
|
|
|
|
skb->next = nskb->next;
|
|
nskb->next = NULL;
|
|
kfree_skb(nskb);
|
|
} while (skb->next);
|
|
|
|
cb = DEV_GSO_CB(skb);
|
|
if (cb->destructor)
|
|
cb->destructor(skb);
|
|
}
|
|
|
|
/**
|
|
* dev_gso_segment - Perform emulated hardware segmentation on skb.
|
|
* @skb: buffer to segment
|
|
* @features: device features as applicable to this skb
|
|
*
|
|
* This function segments the given skb and stores the list of segments
|
|
* in skb->next.
|
|
*/
|
|
static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features)
|
|
{
|
|
struct sk_buff *segs;
|
|
|
|
segs = skb_gso_segment(skb, features);
|
|
|
|
/* Verifying header integrity only. */
|
|
if (!segs)
|
|
return 0;
|
|
|
|
if (IS_ERR(segs))
|
|
return PTR_ERR(segs);
|
|
|
|
skb->next = segs;
|
|
DEV_GSO_CB(skb)->destructor = skb->destructor;
|
|
skb->destructor = dev_gso_skb_destructor;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Try to orphan skb early, right before transmission by the device.
|
|
* We cannot orphan skb if tx timestamp is requested or the sk-reference
|
|
* is needed on driver level for other reasons, e.g. see net/can/raw.c
|
|
*/
|
|
static inline void skb_orphan_try(struct sk_buff *skb)
|
|
{
|
|
struct sock *sk = skb->sk;
|
|
|
|
if (sk && !skb_shinfo(skb)->tx_flags) {
|
|
/* skb_tx_hash() wont be able to get sk.
|
|
* We copy sk_hash into skb->rxhash
|
|
*/
|
|
if (!skb->rxhash)
|
|
skb->rxhash = sk->sk_hash;
|
|
skb_orphan(skb);
|
|
}
|
|
}
|
|
|
|
static bool can_checksum_protocol(netdev_features_t features, __be16 protocol)
|
|
{
|
|
return ((features & NETIF_F_GEN_CSUM) ||
|
|
((features & NETIF_F_V4_CSUM) &&
|
|
protocol == htons(ETH_P_IP)) ||
|
|
((features & NETIF_F_V6_CSUM) &&
|
|
protocol == htons(ETH_P_IPV6)) ||
|
|
((features & NETIF_F_FCOE_CRC) &&
|
|
protocol == htons(ETH_P_FCOE)));
|
|
}
|
|
|
|
static netdev_features_t harmonize_features(struct sk_buff *skb,
|
|
__be16 protocol, netdev_features_t features)
|
|
{
|
|
if (!can_checksum_protocol(features, protocol)) {
|
|
features &= ~NETIF_F_ALL_CSUM;
|
|
features &= ~NETIF_F_SG;
|
|
} else if (illegal_highdma(skb->dev, skb)) {
|
|
features &= ~NETIF_F_SG;
|
|
}
|
|
|
|
return features;
|
|
}
|
|
|
|
netdev_features_t netif_skb_features(struct sk_buff *skb)
|
|
{
|
|
__be16 protocol = skb->protocol;
|
|
netdev_features_t features = skb->dev->features;
|
|
|
|
if (protocol == htons(ETH_P_8021Q)) {
|
|
struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
|
|
protocol = veh->h_vlan_encapsulated_proto;
|
|
} else if (!vlan_tx_tag_present(skb)) {
|
|
return harmonize_features(skb, protocol, features);
|
|
}
|
|
|
|
features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
|
|
|
|
if (protocol != htons(ETH_P_8021Q)) {
|
|
return harmonize_features(skb, protocol, features);
|
|
} else {
|
|
features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
|
|
NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
|
|
return harmonize_features(skb, protocol, features);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(netif_skb_features);
|
|
|
|
/*
|
|
* Returns true if either:
|
|
* 1. skb has frag_list and the device doesn't support FRAGLIST, or
|
|
* 2. skb is fragmented and the device does not support SG, or if
|
|
* at least one of fragments is in highmem and device does not
|
|
* support DMA from it.
|
|
*/
|
|
static inline int skb_needs_linearize(struct sk_buff *skb,
|
|
int features)
|
|
{
|
|
return skb_is_nonlinear(skb) &&
|
|
((skb_has_frag_list(skb) &&
|
|
!(features & NETIF_F_FRAGLIST)) ||
|
|
(skb_shinfo(skb)->nr_frags &&
|
|
!(features & NETIF_F_SG)));
|
|
}
|
|
|
|
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
|
|
struct netdev_queue *txq)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
int rc = NETDEV_TX_OK;
|
|
unsigned int skb_len;
|
|
|
|
if (likely(!skb->next)) {
|
|
netdev_features_t features;
|
|
|
|
/*
|
|
* If device doesn't need skb->dst, release it right now while
|
|
* its hot in this cpu cache
|
|
*/
|
|
if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
|
|
skb_dst_drop(skb);
|
|
|
|
if (!list_empty(&ptype_all))
|
|
dev_queue_xmit_nit(skb, dev);
|
|
|
|
skb_orphan_try(skb);
|
|
|
|
features = netif_skb_features(skb);
|
|
|
|
if (vlan_tx_tag_present(skb) &&
|
|
!(features & NETIF_F_HW_VLAN_TX)) {
|
|
skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
|
|
if (unlikely(!skb))
|
|
goto out;
|
|
|
|
skb->vlan_tci = 0;
|
|
}
|
|
|
|
if (netif_needs_gso(skb, features)) {
|
|
if (unlikely(dev_gso_segment(skb, features)))
|
|
goto out_kfree_skb;
|
|
if (skb->next)
|
|
goto gso;
|
|
} else {
|
|
if (skb_needs_linearize(skb, features) &&
|
|
__skb_linearize(skb))
|
|
goto out_kfree_skb;
|
|
|
|
/* If packet is not checksummed and device does not
|
|
* support checksumming for this protocol, complete
|
|
* checksumming here.
|
|
*/
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
skb_set_transport_header(skb,
|
|
skb_checksum_start_offset(skb));
|
|
if (!(features & NETIF_F_ALL_CSUM) &&
|
|
skb_checksum_help(skb))
|
|
goto out_kfree_skb;
|
|
}
|
|
}
|
|
|
|
skb_len = skb->len;
|
|
rc = ops->ndo_start_xmit(skb, dev);
|
|
trace_net_dev_xmit(skb, rc, dev, skb_len);
|
|
if (rc == NETDEV_TX_OK)
|
|
txq_trans_update(txq);
|
|
return rc;
|
|
}
|
|
|
|
gso:
|
|
do {
|
|
struct sk_buff *nskb = skb->next;
|
|
|
|
skb->next = nskb->next;
|
|
nskb->next = NULL;
|
|
|
|
/*
|
|
* If device doesn't need nskb->dst, release it right now while
|
|
* its hot in this cpu cache
|
|
*/
|
|
if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
|
|
skb_dst_drop(nskb);
|
|
|
|
skb_len = nskb->len;
|
|
rc = ops->ndo_start_xmit(nskb, dev);
|
|
trace_net_dev_xmit(nskb, rc, dev, skb_len);
|
|
if (unlikely(rc != NETDEV_TX_OK)) {
|
|
if (rc & ~NETDEV_TX_MASK)
|
|
goto out_kfree_gso_skb;
|
|
nskb->next = skb->next;
|
|
skb->next = nskb;
|
|
return rc;
|
|
}
|
|
txq_trans_update(txq);
|
|
if (unlikely(netif_xmit_stopped(txq) && skb->next))
|
|
return NETDEV_TX_BUSY;
|
|
} while (skb->next);
|
|
|
|
out_kfree_gso_skb:
|
|
if (likely(skb->next == NULL))
|
|
skb->destructor = DEV_GSO_CB(skb)->destructor;
|
|
out_kfree_skb:
|
|
kfree_skb(skb);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static u32 hashrnd __read_mostly;
|
|
|
|
/*
|
|
* Returns a Tx hash based on the given packet descriptor a Tx queues' number
|
|
* to be used as a distribution range.
|
|
*/
|
|
u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
|
|
unsigned int num_tx_queues)
|
|
{
|
|
u32 hash;
|
|
u16 qoffset = 0;
|
|
u16 qcount = num_tx_queues;
|
|
|
|
if (skb_rx_queue_recorded(skb)) {
|
|
hash = skb_get_rx_queue(skb);
|
|
while (unlikely(hash >= num_tx_queues))
|
|
hash -= num_tx_queues;
|
|
return hash;
|
|
}
|
|
|
|
if (dev->num_tc) {
|
|
u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
|
|
qoffset = dev->tc_to_txq[tc].offset;
|
|
qcount = dev->tc_to_txq[tc].count;
|
|
}
|
|
|
|
if (skb->sk && skb->sk->sk_hash)
|
|
hash = skb->sk->sk_hash;
|
|
else
|
|
hash = (__force u16) skb->protocol ^ skb->rxhash;
|
|
hash = jhash_1word(hash, hashrnd);
|
|
|
|
return (u16) (((u64) hash * qcount) >> 32) + qoffset;
|
|
}
|
|
EXPORT_SYMBOL(__skb_tx_hash);
|
|
|
|
static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
|
|
{
|
|
if (unlikely(queue_index >= dev->real_num_tx_queues)) {
|
|
net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
|
|
dev->name, queue_index,
|
|
dev->real_num_tx_queues);
|
|
return 0;
|
|
}
|
|
return queue_index;
|
|
}
|
|
|
|
static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
|
|
{
|
|
#ifdef CONFIG_XPS
|
|
struct xps_dev_maps *dev_maps;
|
|
struct xps_map *map;
|
|
int queue_index = -1;
|
|
|
|
rcu_read_lock();
|
|
dev_maps = rcu_dereference(dev->xps_maps);
|
|
if (dev_maps) {
|
|
map = rcu_dereference(
|
|
dev_maps->cpu_map[raw_smp_processor_id()]);
|
|
if (map) {
|
|
if (map->len == 1)
|
|
queue_index = map->queues[0];
|
|
else {
|
|
u32 hash;
|
|
if (skb->sk && skb->sk->sk_hash)
|
|
hash = skb->sk->sk_hash;
|
|
else
|
|
hash = (__force u16) skb->protocol ^
|
|
skb->rxhash;
|
|
hash = jhash_1word(hash, hashrnd);
|
|
queue_index = map->queues[
|
|
((u64)hash * map->len) >> 32];
|
|
}
|
|
if (unlikely(queue_index >= dev->real_num_tx_queues))
|
|
queue_index = -1;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return queue_index;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
}
|
|
|
|
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
|
|
struct sk_buff *skb)
|
|
{
|
|
int queue_index;
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
if (dev->real_num_tx_queues == 1)
|
|
queue_index = 0;
|
|
else if (ops->ndo_select_queue) {
|
|
queue_index = ops->ndo_select_queue(dev, skb);
|
|
queue_index = dev_cap_txqueue(dev, queue_index);
|
|
} else {
|
|
struct sock *sk = skb->sk;
|
|
queue_index = sk_tx_queue_get(sk);
|
|
|
|
if (queue_index < 0 || skb->ooo_okay ||
|
|
queue_index >= dev->real_num_tx_queues) {
|
|
int old_index = queue_index;
|
|
|
|
queue_index = get_xps_queue(dev, skb);
|
|
if (queue_index < 0)
|
|
queue_index = skb_tx_hash(dev, skb);
|
|
|
|
if (queue_index != old_index && sk) {
|
|
struct dst_entry *dst =
|
|
rcu_dereference_check(sk->sk_dst_cache, 1);
|
|
|
|
if (dst && skb_dst(skb) == dst)
|
|
sk_tx_queue_set(sk, queue_index);
|
|
}
|
|
}
|
|
}
|
|
|
|
skb_set_queue_mapping(skb, queue_index);
|
|
return netdev_get_tx_queue(dev, queue_index);
|
|
}
|
|
|
|
static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
|
|
struct net_device *dev,
|
|
struct netdev_queue *txq)
|
|
{
|
|
spinlock_t *root_lock = qdisc_lock(q);
|
|
bool contended;
|
|
int rc;
|
|
|
|
qdisc_skb_cb(skb)->pkt_len = skb->len;
|
|
qdisc_calculate_pkt_len(skb, q);
|
|
/*
|
|
* Heuristic to force contended enqueues to serialize on a
|
|
* separate lock before trying to get qdisc main lock.
|
|
* This permits __QDISC_STATE_RUNNING owner to get the lock more often
|
|
* and dequeue packets faster.
|
|
*/
|
|
contended = qdisc_is_running(q);
|
|
if (unlikely(contended))
|
|
spin_lock(&q->busylock);
|
|
|
|
spin_lock(root_lock);
|
|
if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
|
|
kfree_skb(skb);
|
|
rc = NET_XMIT_DROP;
|
|
} else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
|
|
qdisc_run_begin(q)) {
|
|
/*
|
|
* This is a work-conserving queue; there are no old skbs
|
|
* waiting to be sent out; and the qdisc is not running -
|
|
* xmit the skb directly.
|
|
*/
|
|
if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
|
|
skb_dst_force(skb);
|
|
|
|
qdisc_bstats_update(q, skb);
|
|
|
|
if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
|
|
if (unlikely(contended)) {
|
|
spin_unlock(&q->busylock);
|
|
contended = false;
|
|
}
|
|
__qdisc_run(q);
|
|
} else
|
|
qdisc_run_end(q);
|
|
|
|
rc = NET_XMIT_SUCCESS;
|
|
} else {
|
|
skb_dst_force(skb);
|
|
rc = q->enqueue(skb, q) & NET_XMIT_MASK;
|
|
if (qdisc_run_begin(q)) {
|
|
if (unlikely(contended)) {
|
|
spin_unlock(&q->busylock);
|
|
contended = false;
|
|
}
|
|
__qdisc_run(q);
|
|
}
|
|
}
|
|
spin_unlock(root_lock);
|
|
if (unlikely(contended))
|
|
spin_unlock(&q->busylock);
|
|
return rc;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
|
|
static void skb_update_prio(struct sk_buff *skb)
|
|
{
|
|
struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
|
|
|
|
if ((!skb->priority) && (skb->sk) && map)
|
|
skb->priority = map->priomap[skb->sk->sk_cgrp_prioidx];
|
|
}
|
|
#else
|
|
#define skb_update_prio(skb)
|
|
#endif
|
|
|
|
static DEFINE_PER_CPU(int, xmit_recursion);
|
|
#define RECURSION_LIMIT 10
|
|
|
|
/**
|
|
* dev_queue_xmit - transmit a buffer
|
|
* @skb: buffer to transmit
|
|
*
|
|
* Queue a buffer for transmission to a network device. The caller must
|
|
* have set the device and priority and built the buffer before calling
|
|
* this function. The function can be called from an interrupt.
|
|
*
|
|
* A negative errno code is returned on a failure. A success does not
|
|
* guarantee the frame will be transmitted as it may be dropped due
|
|
* to congestion or traffic shaping.
|
|
*
|
|
* -----------------------------------------------------------------------------------
|
|
* I notice this method can also return errors from the queue disciplines,
|
|
* including NET_XMIT_DROP, which is a positive value. So, errors can also
|
|
* be positive.
|
|
*
|
|
* Regardless of the return value, the skb is consumed, so it is currently
|
|
* difficult to retry a send to this method. (You can bump the ref count
|
|
* before sending to hold a reference for retry if you are careful.)
|
|
*
|
|
* When calling this method, interrupts MUST be enabled. This is because
|
|
* the BH enable code must have IRQs enabled so that it will not deadlock.
|
|
* --BLG
|
|
*/
|
|
int dev_queue_xmit(struct sk_buff *skb)
|
|
{
|
|
struct net_device *dev = skb->dev;
|
|
struct netdev_queue *txq;
|
|
struct Qdisc *q;
|
|
int rc = -ENOMEM;
|
|
|
|
/* Disable soft irqs for various locks below. Also
|
|
* stops preemption for RCU.
|
|
*/
|
|
rcu_read_lock_bh();
|
|
|
|
skb_update_prio(skb);
|
|
|
|
txq = dev_pick_tx(dev, skb);
|
|
q = rcu_dereference_bh(txq->qdisc);
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
|
|
#endif
|
|
trace_net_dev_queue(skb);
|
|
if (q->enqueue) {
|
|
rc = __dev_xmit_skb(skb, q, dev, txq);
|
|
goto out;
|
|
}
|
|
|
|
/* The device has no queue. Common case for software devices:
|
|
loopback, all the sorts of tunnels...
|
|
|
|
Really, it is unlikely that netif_tx_lock protection is necessary
|
|
here. (f.e. loopback and IP tunnels are clean ignoring statistics
|
|
counters.)
|
|
However, it is possible, that they rely on protection
|
|
made by us here.
|
|
|
|
Check this and shot the lock. It is not prone from deadlocks.
|
|
Either shot noqueue qdisc, it is even simpler 8)
|
|
*/
|
|
if (dev->flags & IFF_UP) {
|
|
int cpu = smp_processor_id(); /* ok because BHs are off */
|
|
|
|
if (txq->xmit_lock_owner != cpu) {
|
|
|
|
if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
|
|
goto recursion_alert;
|
|
|
|
HARD_TX_LOCK(dev, txq, cpu);
|
|
|
|
if (!netif_xmit_stopped(txq)) {
|
|
__this_cpu_inc(xmit_recursion);
|
|
rc = dev_hard_start_xmit(skb, dev, txq);
|
|
__this_cpu_dec(xmit_recursion);
|
|
if (dev_xmit_complete(rc)) {
|
|
HARD_TX_UNLOCK(dev, txq);
|
|
goto out;
|
|
}
|
|
}
|
|
HARD_TX_UNLOCK(dev, txq);
|
|
net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
|
|
dev->name);
|
|
} else {
|
|
/* Recursion is detected! It is possible,
|
|
* unfortunately
|
|
*/
|
|
recursion_alert:
|
|
net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
|
|
dev->name);
|
|
}
|
|
}
|
|
|
|
rc = -ENETDOWN;
|
|
rcu_read_unlock_bh();
|
|
|
|
kfree_skb(skb);
|
|
return rc;
|
|
out:
|
|
rcu_read_unlock_bh();
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(dev_queue_xmit);
|
|
|
|
|
|
/*=======================================================================
|
|
Receiver routines
|
|
=======================================================================*/
|
|
|
|
int netdev_max_backlog __read_mostly = 1000;
|
|
int netdev_tstamp_prequeue __read_mostly = 1;
|
|
int netdev_budget __read_mostly = 300;
|
|
int weight_p __read_mostly = 64; /* old backlog weight */
|
|
|
|
/* Called with irq disabled */
|
|
static inline void ____napi_schedule(struct softnet_data *sd,
|
|
struct napi_struct *napi)
|
|
{
|
|
list_add_tail(&napi->poll_list, &sd->poll_list);
|
|
__raise_softirq_irqoff(NET_RX_SOFTIRQ);
|
|
}
|
|
|
|
/*
|
|
* __skb_get_rxhash: calculate a flow hash based on src/dst addresses
|
|
* and src/dst port numbers. Sets rxhash in skb to non-zero hash value
|
|
* on success, zero indicates no valid hash. Also, sets l4_rxhash in skb
|
|
* if hash is a canonical 4-tuple hash over transport ports.
|
|
*/
|
|
void __skb_get_rxhash(struct sk_buff *skb)
|
|
{
|
|
struct flow_keys keys;
|
|
u32 hash;
|
|
|
|
if (!skb_flow_dissect(skb, &keys))
|
|
return;
|
|
|
|
if (keys.ports) {
|
|
if ((__force u16)keys.port16[1] < (__force u16)keys.port16[0])
|
|
swap(keys.port16[0], keys.port16[1]);
|
|
skb->l4_rxhash = 1;
|
|
}
|
|
|
|
/* get a consistent hash (same value on both flow directions) */
|
|
if ((__force u32)keys.dst < (__force u32)keys.src)
|
|
swap(keys.dst, keys.src);
|
|
|
|
hash = jhash_3words((__force u32)keys.dst,
|
|
(__force u32)keys.src,
|
|
(__force u32)keys.ports, hashrnd);
|
|
if (!hash)
|
|
hash = 1;
|
|
|
|
skb->rxhash = hash;
|
|
}
|
|
EXPORT_SYMBOL(__skb_get_rxhash);
|
|
|
|
#ifdef CONFIG_RPS
|
|
|
|
/* One global table that all flow-based protocols share. */
|
|
struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
|
|
EXPORT_SYMBOL(rps_sock_flow_table);
|
|
|
|
struct static_key rps_needed __read_mostly;
|
|
|
|
static struct rps_dev_flow *
|
|
set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
|
|
struct rps_dev_flow *rflow, u16 next_cpu)
|
|
{
|
|
if (next_cpu != RPS_NO_CPU) {
|
|
#ifdef CONFIG_RFS_ACCEL
|
|
struct netdev_rx_queue *rxqueue;
|
|
struct rps_dev_flow_table *flow_table;
|
|
struct rps_dev_flow *old_rflow;
|
|
u32 flow_id;
|
|
u16 rxq_index;
|
|
int rc;
|
|
|
|
/* Should we steer this flow to a different hardware queue? */
|
|
if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
|
|
!(dev->features & NETIF_F_NTUPLE))
|
|
goto out;
|
|
rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
|
|
if (rxq_index == skb_get_rx_queue(skb))
|
|
goto out;
|
|
|
|
rxqueue = dev->_rx + rxq_index;
|
|
flow_table = rcu_dereference(rxqueue->rps_flow_table);
|
|
if (!flow_table)
|
|
goto out;
|
|
flow_id = skb->rxhash & flow_table->mask;
|
|
rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
|
|
rxq_index, flow_id);
|
|
if (rc < 0)
|
|
goto out;
|
|
old_rflow = rflow;
|
|
rflow = &flow_table->flows[flow_id];
|
|
rflow->filter = rc;
|
|
if (old_rflow->filter == rflow->filter)
|
|
old_rflow->filter = RPS_NO_FILTER;
|
|
out:
|
|
#endif
|
|
rflow->last_qtail =
|
|
per_cpu(softnet_data, next_cpu).input_queue_head;
|
|
}
|
|
|
|
rflow->cpu = next_cpu;
|
|
return rflow;
|
|
}
|
|
|
|
/*
|
|
* get_rps_cpu is called from netif_receive_skb and returns the target
|
|
* CPU from the RPS map of the receiving queue for a given skb.
|
|
* rcu_read_lock must be held on entry.
|
|
*/
|
|
static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
|
|
struct rps_dev_flow **rflowp)
|
|
{
|
|
struct netdev_rx_queue *rxqueue;
|
|
struct rps_map *map;
|
|
struct rps_dev_flow_table *flow_table;
|
|
struct rps_sock_flow_table *sock_flow_table;
|
|
int cpu = -1;
|
|
u16 tcpu;
|
|
|
|
if (skb_rx_queue_recorded(skb)) {
|
|
u16 index = skb_get_rx_queue(skb);
|
|
if (unlikely(index >= dev->real_num_rx_queues)) {
|
|
WARN_ONCE(dev->real_num_rx_queues > 1,
|
|
"%s received packet on queue %u, but number "
|
|
"of RX queues is %u\n",
|
|
dev->name, index, dev->real_num_rx_queues);
|
|
goto done;
|
|
}
|
|
rxqueue = dev->_rx + index;
|
|
} else
|
|
rxqueue = dev->_rx;
|
|
|
|
map = rcu_dereference(rxqueue->rps_map);
|
|
if (map) {
|
|
if (map->len == 1 &&
|
|
!rcu_access_pointer(rxqueue->rps_flow_table)) {
|
|
tcpu = map->cpus[0];
|
|
if (cpu_online(tcpu))
|
|
cpu = tcpu;
|
|
goto done;
|
|
}
|
|
} else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
|
|
goto done;
|
|
}
|
|
|
|
skb_reset_network_header(skb);
|
|
if (!skb_get_rxhash(skb))
|
|
goto done;
|
|
|
|
flow_table = rcu_dereference(rxqueue->rps_flow_table);
|
|
sock_flow_table = rcu_dereference(rps_sock_flow_table);
|
|
if (flow_table && sock_flow_table) {
|
|
u16 next_cpu;
|
|
struct rps_dev_flow *rflow;
|
|
|
|
rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
|
|
tcpu = rflow->cpu;
|
|
|
|
next_cpu = sock_flow_table->ents[skb->rxhash &
|
|
sock_flow_table->mask];
|
|
|
|
/*
|
|
* If the desired CPU (where last recvmsg was done) is
|
|
* different from current CPU (one in the rx-queue flow
|
|
* table entry), switch if one of the following holds:
|
|
* - Current CPU is unset (equal to RPS_NO_CPU).
|
|
* - Current CPU is offline.
|
|
* - The current CPU's queue tail has advanced beyond the
|
|
* last packet that was enqueued using this table entry.
|
|
* This guarantees that all previous packets for the flow
|
|
* have been dequeued, thus preserving in order delivery.
|
|
*/
|
|
if (unlikely(tcpu != next_cpu) &&
|
|
(tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
|
|
((int)(per_cpu(softnet_data, tcpu).input_queue_head -
|
|
rflow->last_qtail)) >= 0))
|
|
rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
|
|
|
|
if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
|
|
*rflowp = rflow;
|
|
cpu = tcpu;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (map) {
|
|
tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
|
|
|
|
if (cpu_online(tcpu)) {
|
|
cpu = tcpu;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
return cpu;
|
|
}
|
|
|
|
#ifdef CONFIG_RFS_ACCEL
|
|
|
|
/**
|
|
* rps_may_expire_flow - check whether an RFS hardware filter may be removed
|
|
* @dev: Device on which the filter was set
|
|
* @rxq_index: RX queue index
|
|
* @flow_id: Flow ID passed to ndo_rx_flow_steer()
|
|
* @filter_id: Filter ID returned by ndo_rx_flow_steer()
|
|
*
|
|
* Drivers that implement ndo_rx_flow_steer() should periodically call
|
|
* this function for each installed filter and remove the filters for
|
|
* which it returns %true.
|
|
*/
|
|
bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
|
|
u32 flow_id, u16 filter_id)
|
|
{
|
|
struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
|
|
struct rps_dev_flow_table *flow_table;
|
|
struct rps_dev_flow *rflow;
|
|
bool expire = true;
|
|
int cpu;
|
|
|
|
rcu_read_lock();
|
|
flow_table = rcu_dereference(rxqueue->rps_flow_table);
|
|
if (flow_table && flow_id <= flow_table->mask) {
|
|
rflow = &flow_table->flows[flow_id];
|
|
cpu = ACCESS_ONCE(rflow->cpu);
|
|
if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
|
|
((int)(per_cpu(softnet_data, cpu).input_queue_head -
|
|
rflow->last_qtail) <
|
|
(int)(10 * flow_table->mask)))
|
|
expire = false;
|
|
}
|
|
rcu_read_unlock();
|
|
return expire;
|
|
}
|
|
EXPORT_SYMBOL(rps_may_expire_flow);
|
|
|
|
#endif /* CONFIG_RFS_ACCEL */
|
|
|
|
/* Called from hardirq (IPI) context */
|
|
static void rps_trigger_softirq(void *data)
|
|
{
|
|
struct softnet_data *sd = data;
|
|
|
|
____napi_schedule(sd, &sd->backlog);
|
|
sd->received_rps++;
|
|
}
|
|
|
|
#endif /* CONFIG_RPS */
|
|
|
|
/*
|
|
* Check if this softnet_data structure is another cpu one
|
|
* If yes, queue it to our IPI list and return 1
|
|
* If no, return 0
|
|
*/
|
|
static int rps_ipi_queued(struct softnet_data *sd)
|
|
{
|
|
#ifdef CONFIG_RPS
|
|
struct softnet_data *mysd = &__get_cpu_var(softnet_data);
|
|
|
|
if (sd != mysd) {
|
|
sd->rps_ipi_next = mysd->rps_ipi_list;
|
|
mysd->rps_ipi_list = sd;
|
|
|
|
__raise_softirq_irqoff(NET_RX_SOFTIRQ);
|
|
return 1;
|
|
}
|
|
#endif /* CONFIG_RPS */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* enqueue_to_backlog is called to queue an skb to a per CPU backlog
|
|
* queue (may be a remote CPU queue).
|
|
*/
|
|
static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
|
|
unsigned int *qtail)
|
|
{
|
|
struct softnet_data *sd;
|
|
unsigned long flags;
|
|
|
|
sd = &per_cpu(softnet_data, cpu);
|
|
|
|
local_irq_save(flags);
|
|
|
|
rps_lock(sd);
|
|
if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
|
|
if (skb_queue_len(&sd->input_pkt_queue)) {
|
|
enqueue:
|
|
__skb_queue_tail(&sd->input_pkt_queue, skb);
|
|
input_queue_tail_incr_save(sd, qtail);
|
|
rps_unlock(sd);
|
|
local_irq_restore(flags);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
/* Schedule NAPI for backlog device
|
|
* We can use non atomic operation since we own the queue lock
|
|
*/
|
|
if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
|
|
if (!rps_ipi_queued(sd))
|
|
____napi_schedule(sd, &sd->backlog);
|
|
}
|
|
goto enqueue;
|
|
}
|
|
|
|
sd->dropped++;
|
|
rps_unlock(sd);
|
|
|
|
local_irq_restore(flags);
|
|
|
|
atomic_long_inc(&skb->dev->rx_dropped);
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
/**
|
|
* netif_rx - post buffer to the network code
|
|
* @skb: buffer to post
|
|
*
|
|
* This function receives a packet from a device driver and queues it for
|
|
* the upper (protocol) levels to process. It always succeeds. The buffer
|
|
* may be dropped during processing for congestion control or by the
|
|
* protocol layers.
|
|
*
|
|
* return values:
|
|
* NET_RX_SUCCESS (no congestion)
|
|
* NET_RX_DROP (packet was dropped)
|
|
*
|
|
*/
|
|
|
|
int netif_rx(struct sk_buff *skb)
|
|
{
|
|
int ret;
|
|
|
|
/* if netpoll wants it, pretend we never saw it */
|
|
if (netpoll_rx(skb))
|
|
return NET_RX_DROP;
|
|
|
|
net_timestamp_check(netdev_tstamp_prequeue, skb);
|
|
|
|
trace_netif_rx(skb);
|
|
#ifdef CONFIG_RPS
|
|
if (static_key_false(&rps_needed)) {
|
|
struct rps_dev_flow voidflow, *rflow = &voidflow;
|
|
int cpu;
|
|
|
|
preempt_disable();
|
|
rcu_read_lock();
|
|
|
|
cpu = get_rps_cpu(skb->dev, skb, &rflow);
|
|
if (cpu < 0)
|
|
cpu = smp_processor_id();
|
|
|
|
ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
|
|
|
|
rcu_read_unlock();
|
|
preempt_enable();
|
|
} else
|
|
#endif
|
|
{
|
|
unsigned int qtail;
|
|
ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
|
|
put_cpu();
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(netif_rx);
|
|
|
|
int netif_rx_ni(struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
|
|
preempt_disable();
|
|
err = netif_rx(skb);
|
|
if (local_softirq_pending())
|
|
do_softirq();
|
|
preempt_enable();
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(netif_rx_ni);
|
|
|
|
static void net_tx_action(struct softirq_action *h)
|
|
{
|
|
struct softnet_data *sd = &__get_cpu_var(softnet_data);
|
|
|
|
if (sd->completion_queue) {
|
|
struct sk_buff *clist;
|
|
|
|
local_irq_disable();
|
|
clist = sd->completion_queue;
|
|
sd->completion_queue = NULL;
|
|
local_irq_enable();
|
|
|
|
while (clist) {
|
|
struct sk_buff *skb = clist;
|
|
clist = clist->next;
|
|
|
|
WARN_ON(atomic_read(&skb->users));
|
|
trace_kfree_skb(skb, net_tx_action);
|
|
__kfree_skb(skb);
|
|
}
|
|
}
|
|
|
|
if (sd->output_queue) {
|
|
struct Qdisc *head;
|
|
|
|
local_irq_disable();
|
|
head = sd->output_queue;
|
|
sd->output_queue = NULL;
|
|
sd->output_queue_tailp = &sd->output_queue;
|
|
local_irq_enable();
|
|
|
|
while (head) {
|
|
struct Qdisc *q = head;
|
|
spinlock_t *root_lock;
|
|
|
|
head = head->next_sched;
|
|
|
|
root_lock = qdisc_lock(q);
|
|
if (spin_trylock(root_lock)) {
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(__QDISC_STATE_SCHED,
|
|
&q->state);
|
|
qdisc_run(q);
|
|
spin_unlock(root_lock);
|
|
} else {
|
|
if (!test_bit(__QDISC_STATE_DEACTIVATED,
|
|
&q->state)) {
|
|
__netif_reschedule(q);
|
|
} else {
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(__QDISC_STATE_SCHED,
|
|
&q->state);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
|
|
(defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
|
|
/* This hook is defined here for ATM LANE */
|
|
int (*br_fdb_test_addr_hook)(struct net_device *dev,
|
|
unsigned char *addr) __read_mostly;
|
|
EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
/* TODO: Maybe we should just force sch_ingress to be compiled in
|
|
* when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
|
|
* a compare and 2 stores extra right now if we dont have it on
|
|
* but have CONFIG_NET_CLS_ACT
|
|
* NOTE: This doesn't stop any functionality; if you dont have
|
|
* the ingress scheduler, you just can't add policies on ingress.
|
|
*
|
|
*/
|
|
static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
|
|
{
|
|
struct net_device *dev = skb->dev;
|
|
u32 ttl = G_TC_RTTL(skb->tc_verd);
|
|
int result = TC_ACT_OK;
|
|
struct Qdisc *q;
|
|
|
|
if (unlikely(MAX_RED_LOOP < ttl++)) {
|
|
net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
|
|
skb->skb_iif, dev->ifindex);
|
|
return TC_ACT_SHOT;
|
|
}
|
|
|
|
skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
|
|
skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
|
|
|
|
q = rxq->qdisc;
|
|
if (q != &noop_qdisc) {
|
|
spin_lock(qdisc_lock(q));
|
|
if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
|
|
result = qdisc_enqueue_root(skb, q);
|
|
spin_unlock(qdisc_lock(q));
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
|
|
struct packet_type **pt_prev,
|
|
int *ret, struct net_device *orig_dev)
|
|
{
|
|
struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);
|
|
|
|
if (!rxq || rxq->qdisc == &noop_qdisc)
|
|
goto out;
|
|
|
|
if (*pt_prev) {
|
|
*ret = deliver_skb(skb, *pt_prev, orig_dev);
|
|
*pt_prev = NULL;
|
|
}
|
|
|
|
switch (ing_filter(skb, rxq)) {
|
|
case TC_ACT_SHOT:
|
|
case TC_ACT_STOLEN:
|
|
kfree_skb(skb);
|
|
return NULL;
|
|
}
|
|
|
|
out:
|
|
skb->tc_verd = 0;
|
|
return skb;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* netdev_rx_handler_register - register receive handler
|
|
* @dev: device to register a handler for
|
|
* @rx_handler: receive handler to register
|
|
* @rx_handler_data: data pointer that is used by rx handler
|
|
*
|
|
* Register a receive hander for a device. This handler will then be
|
|
* called from __netif_receive_skb. A negative errno code is returned
|
|
* on a failure.
|
|
*
|
|
* The caller must hold the rtnl_mutex.
|
|
*
|
|
* For a general description of rx_handler, see enum rx_handler_result.
|
|
*/
|
|
int netdev_rx_handler_register(struct net_device *dev,
|
|
rx_handler_func_t *rx_handler,
|
|
void *rx_handler_data)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
if (dev->rx_handler)
|
|
return -EBUSY;
|
|
|
|
rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
|
|
rcu_assign_pointer(dev->rx_handler, rx_handler);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
|
|
|
|
/**
|
|
* netdev_rx_handler_unregister - unregister receive handler
|
|
* @dev: device to unregister a handler from
|
|
*
|
|
* Unregister a receive hander from a device.
|
|
*
|
|
* The caller must hold the rtnl_mutex.
|
|
*/
|
|
void netdev_rx_handler_unregister(struct net_device *dev)
|
|
{
|
|
|
|
ASSERT_RTNL();
|
|
RCU_INIT_POINTER(dev->rx_handler, NULL);
|
|
RCU_INIT_POINTER(dev->rx_handler_data, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
|
|
|
|
static int __netif_receive_skb(struct sk_buff *skb)
|
|
{
|
|
struct packet_type *ptype, *pt_prev;
|
|
rx_handler_func_t *rx_handler;
|
|
struct net_device *orig_dev;
|
|
struct net_device *null_or_dev;
|
|
bool deliver_exact = false;
|
|
int ret = NET_RX_DROP;
|
|
__be16 type;
|
|
|
|
net_timestamp_check(!netdev_tstamp_prequeue, skb);
|
|
|
|
trace_netif_receive_skb(skb);
|
|
|
|
/* if we've gotten here through NAPI, check netpoll */
|
|
if (netpoll_receive_skb(skb))
|
|
return NET_RX_DROP;
|
|
|
|
if (!skb->skb_iif)
|
|
skb->skb_iif = skb->dev->ifindex;
|
|
orig_dev = skb->dev;
|
|
|
|
skb_reset_network_header(skb);
|
|
skb_reset_transport_header(skb);
|
|
skb_reset_mac_len(skb);
|
|
|
|
pt_prev = NULL;
|
|
|
|
rcu_read_lock();
|
|
|
|
another_round:
|
|
|
|
__this_cpu_inc(softnet_data.processed);
|
|
|
|
if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
|
|
skb = vlan_untag(skb);
|
|
if (unlikely(!skb))
|
|
goto out;
|
|
}
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
if (skb->tc_verd & TC_NCLS) {
|
|
skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
|
|
goto ncls;
|
|
}
|
|
#endif
|
|
|
|
list_for_each_entry_rcu(ptype, &ptype_all, list) {
|
|
if (!ptype->dev || ptype->dev == skb->dev) {
|
|
if (pt_prev)
|
|
ret = deliver_skb(skb, pt_prev, orig_dev);
|
|
pt_prev = ptype;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
|
|
if (!skb)
|
|
goto out;
|
|
ncls:
|
|
#endif
|
|
|
|
rx_handler = rcu_dereference(skb->dev->rx_handler);
|
|
if (vlan_tx_tag_present(skb)) {
|
|
if (pt_prev) {
|
|
ret = deliver_skb(skb, pt_prev, orig_dev);
|
|
pt_prev = NULL;
|
|
}
|
|
if (vlan_do_receive(&skb, !rx_handler))
|
|
goto another_round;
|
|
else if (unlikely(!skb))
|
|
goto out;
|
|
}
|
|
|
|
if (rx_handler) {
|
|
if (pt_prev) {
|
|
ret = deliver_skb(skb, pt_prev, orig_dev);
|
|
pt_prev = NULL;
|
|
}
|
|
switch (rx_handler(&skb)) {
|
|
case RX_HANDLER_CONSUMED:
|
|
goto out;
|
|
case RX_HANDLER_ANOTHER:
|
|
goto another_round;
|
|
case RX_HANDLER_EXACT:
|
|
deliver_exact = true;
|
|
case RX_HANDLER_PASS:
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
/* deliver only exact match when indicated */
|
|
null_or_dev = deliver_exact ? skb->dev : NULL;
|
|
|
|
type = skb->protocol;
|
|
list_for_each_entry_rcu(ptype,
|
|
&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
|
|
if (ptype->type == type &&
|
|
(ptype->dev == null_or_dev || ptype->dev == skb->dev ||
|
|
ptype->dev == orig_dev)) {
|
|
if (pt_prev)
|
|
ret = deliver_skb(skb, pt_prev, orig_dev);
|
|
pt_prev = ptype;
|
|
}
|
|
}
|
|
|
|
if (pt_prev) {
|
|
ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
|
|
} else {
|
|
atomic_long_inc(&skb->dev->rx_dropped);
|
|
kfree_skb(skb);
|
|
/* Jamal, now you will not able to escape explaining
|
|
* me how you were going to use this. :-)
|
|
*/
|
|
ret = NET_RX_DROP;
|
|
}
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* netif_receive_skb - process receive buffer from network
|
|
* @skb: buffer to process
|
|
*
|
|
* netif_receive_skb() is the main receive data processing function.
|
|
* It always succeeds. The buffer may be dropped during processing
|
|
* for congestion control or by the protocol layers.
|
|
*
|
|
* This function may only be called from softirq context and interrupts
|
|
* should be enabled.
|
|
*
|
|
* Return values (usually ignored):
|
|
* NET_RX_SUCCESS: no congestion
|
|
* NET_RX_DROP: packet was dropped
|
|
*/
|
|
int netif_receive_skb(struct sk_buff *skb)
|
|
{
|
|
net_timestamp_check(netdev_tstamp_prequeue, skb);
|
|
|
|
if (skb_defer_rx_timestamp(skb))
|
|
return NET_RX_SUCCESS;
|
|
|
|
#ifdef CONFIG_RPS
|
|
if (static_key_false(&rps_needed)) {
|
|
struct rps_dev_flow voidflow, *rflow = &voidflow;
|
|
int cpu, ret;
|
|
|
|
rcu_read_lock();
|
|
|
|
cpu = get_rps_cpu(skb->dev, skb, &rflow);
|
|
|
|
if (cpu >= 0) {
|
|
ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
#endif
|
|
return __netif_receive_skb(skb);
|
|
}
|
|
EXPORT_SYMBOL(netif_receive_skb);
|
|
|
|
/* Network device is going away, flush any packets still pending
|
|
* Called with irqs disabled.
|
|
*/
|
|
static void flush_backlog(void *arg)
|
|
{
|
|
struct net_device *dev = arg;
|
|
struct softnet_data *sd = &__get_cpu_var(softnet_data);
|
|
struct sk_buff *skb, *tmp;
|
|
|
|
rps_lock(sd);
|
|
skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
|
|
if (skb->dev == dev) {
|
|
__skb_unlink(skb, &sd->input_pkt_queue);
|
|
kfree_skb(skb);
|
|
input_queue_head_incr(sd);
|
|
}
|
|
}
|
|
rps_unlock(sd);
|
|
|
|
skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
|
|
if (skb->dev == dev) {
|
|
__skb_unlink(skb, &sd->process_queue);
|
|
kfree_skb(skb);
|
|
input_queue_head_incr(sd);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int napi_gro_complete(struct sk_buff *skb)
|
|
{
|
|
struct packet_type *ptype;
|
|
__be16 type = skb->protocol;
|
|
struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
|
|
int err = -ENOENT;
|
|
|
|
if (NAPI_GRO_CB(skb)->count == 1) {
|
|
skb_shinfo(skb)->gso_size = 0;
|
|
goto out;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(ptype, head, list) {
|
|
if (ptype->type != type || ptype->dev || !ptype->gro_complete)
|
|
continue;
|
|
|
|
err = ptype->gro_complete(skb);
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (err) {
|
|
WARN_ON(&ptype->list == head);
|
|
kfree_skb(skb);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
out:
|
|
return netif_receive_skb(skb);
|
|
}
|
|
|
|
inline void napi_gro_flush(struct napi_struct *napi)
|
|
{
|
|
struct sk_buff *skb, *next;
|
|
|
|
for (skb = napi->gro_list; skb; skb = next) {
|
|
next = skb->next;
|
|
skb->next = NULL;
|
|
napi_gro_complete(skb);
|
|
}
|
|
|
|
napi->gro_count = 0;
|
|
napi->gro_list = NULL;
|
|
}
|
|
EXPORT_SYMBOL(napi_gro_flush);
|
|
|
|
enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
|
|
{
|
|
struct sk_buff **pp = NULL;
|
|
struct packet_type *ptype;
|
|
__be16 type = skb->protocol;
|
|
struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
|
|
int same_flow;
|
|
int mac_len;
|
|
enum gro_result ret;
|
|
|
|
if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
|
|
goto normal;
|
|
|
|
if (skb_is_gso(skb) || skb_has_frag_list(skb))
|
|
goto normal;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(ptype, head, list) {
|
|
if (ptype->type != type || ptype->dev || !ptype->gro_receive)
|
|
continue;
|
|
|
|
skb_set_network_header(skb, skb_gro_offset(skb));
|
|
mac_len = skb->network_header - skb->mac_header;
|
|
skb->mac_len = mac_len;
|
|
NAPI_GRO_CB(skb)->same_flow = 0;
|
|
NAPI_GRO_CB(skb)->flush = 0;
|
|
NAPI_GRO_CB(skb)->free = 0;
|
|
|
|
pp = ptype->gro_receive(&napi->gro_list, skb);
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (&ptype->list == head)
|
|
goto normal;
|
|
|
|
same_flow = NAPI_GRO_CB(skb)->same_flow;
|
|
ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
|
|
|
|
if (pp) {
|
|
struct sk_buff *nskb = *pp;
|
|
|
|
*pp = nskb->next;
|
|
nskb->next = NULL;
|
|
napi_gro_complete(nskb);
|
|
napi->gro_count--;
|
|
}
|
|
|
|
if (same_flow)
|
|
goto ok;
|
|
|
|
if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
|
|
goto normal;
|
|
|
|
napi->gro_count++;
|
|
NAPI_GRO_CB(skb)->count = 1;
|
|
skb_shinfo(skb)->gso_size = skb_gro_len(skb);
|
|
skb->next = napi->gro_list;
|
|
napi->gro_list = skb;
|
|
ret = GRO_HELD;
|
|
|
|
pull:
|
|
if (skb_headlen(skb) < skb_gro_offset(skb)) {
|
|
int grow = skb_gro_offset(skb) - skb_headlen(skb);
|
|
|
|
BUG_ON(skb->end - skb->tail < grow);
|
|
|
|
memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
|
|
|
|
skb->tail += grow;
|
|
skb->data_len -= grow;
|
|
|
|
skb_shinfo(skb)->frags[0].page_offset += grow;
|
|
skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
|
|
|
|
if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
|
|
skb_frag_unref(skb, 0);
|
|
memmove(skb_shinfo(skb)->frags,
|
|
skb_shinfo(skb)->frags + 1,
|
|
--skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
|
|
}
|
|
}
|
|
|
|
ok:
|
|
return ret;
|
|
|
|
normal:
|
|
ret = GRO_NORMAL;
|
|
goto pull;
|
|
}
|
|
EXPORT_SYMBOL(dev_gro_receive);
|
|
|
|
static inline gro_result_t
|
|
__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *p;
|
|
unsigned int maclen = skb->dev->hard_header_len;
|
|
|
|
for (p = napi->gro_list; p; p = p->next) {
|
|
unsigned long diffs;
|
|
|
|
diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
|
|
diffs |= p->vlan_tci ^ skb->vlan_tci;
|
|
if (maclen == ETH_HLEN)
|
|
diffs |= compare_ether_header(skb_mac_header(p),
|
|
skb_gro_mac_header(skb));
|
|
else if (!diffs)
|
|
diffs = memcmp(skb_mac_header(p),
|
|
skb_gro_mac_header(skb),
|
|
maclen);
|
|
NAPI_GRO_CB(p)->same_flow = !diffs;
|
|
NAPI_GRO_CB(p)->flush = 0;
|
|
}
|
|
|
|
return dev_gro_receive(napi, skb);
|
|
}
|
|
|
|
gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
|
|
{
|
|
switch (ret) {
|
|
case GRO_NORMAL:
|
|
if (netif_receive_skb(skb))
|
|
ret = GRO_DROP;
|
|
break;
|
|
|
|
case GRO_DROP:
|
|
kfree_skb(skb);
|
|
break;
|
|
|
|
case GRO_MERGED_FREE:
|
|
if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
|
|
kmem_cache_free(skbuff_head_cache, skb);
|
|
else
|
|
__kfree_skb(skb);
|
|
break;
|
|
|
|
case GRO_HELD:
|
|
case GRO_MERGED:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(napi_skb_finish);
|
|
|
|
void skb_gro_reset_offset(struct sk_buff *skb)
|
|
{
|
|
NAPI_GRO_CB(skb)->data_offset = 0;
|
|
NAPI_GRO_CB(skb)->frag0 = NULL;
|
|
NAPI_GRO_CB(skb)->frag0_len = 0;
|
|
|
|
if (skb->mac_header == skb->tail &&
|
|
!PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
|
|
NAPI_GRO_CB(skb)->frag0 =
|
|
skb_frag_address(&skb_shinfo(skb)->frags[0]);
|
|
NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(skb_gro_reset_offset);
|
|
|
|
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
|
|
{
|
|
skb_gro_reset_offset(skb);
|
|
|
|
return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
|
|
}
|
|
EXPORT_SYMBOL(napi_gro_receive);
|
|
|
|
static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
|
|
{
|
|
__skb_pull(skb, skb_headlen(skb));
|
|
/* restore the reserve we had after netdev_alloc_skb_ip_align() */
|
|
skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
|
|
skb->vlan_tci = 0;
|
|
skb->dev = napi->dev;
|
|
skb->skb_iif = 0;
|
|
|
|
napi->skb = skb;
|
|
}
|
|
|
|
struct sk_buff *napi_get_frags(struct napi_struct *napi)
|
|
{
|
|
struct sk_buff *skb = napi->skb;
|
|
|
|
if (!skb) {
|
|
skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
|
|
if (skb)
|
|
napi->skb = skb;
|
|
}
|
|
return skb;
|
|
}
|
|
EXPORT_SYMBOL(napi_get_frags);
|
|
|
|
gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
|
|
gro_result_t ret)
|
|
{
|
|
switch (ret) {
|
|
case GRO_NORMAL:
|
|
case GRO_HELD:
|
|
skb->protocol = eth_type_trans(skb, skb->dev);
|
|
|
|
if (ret == GRO_HELD)
|
|
skb_gro_pull(skb, -ETH_HLEN);
|
|
else if (netif_receive_skb(skb))
|
|
ret = GRO_DROP;
|
|
break;
|
|
|
|
case GRO_DROP:
|
|
case GRO_MERGED_FREE:
|
|
napi_reuse_skb(napi, skb);
|
|
break;
|
|
|
|
case GRO_MERGED:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(napi_frags_finish);
|
|
|
|
static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
|
|
{
|
|
struct sk_buff *skb = napi->skb;
|
|
struct ethhdr *eth;
|
|
unsigned int hlen;
|
|
unsigned int off;
|
|
|
|
napi->skb = NULL;
|
|
|
|
skb_reset_mac_header(skb);
|
|
skb_gro_reset_offset(skb);
|
|
|
|
off = skb_gro_offset(skb);
|
|
hlen = off + sizeof(*eth);
|
|
eth = skb_gro_header_fast(skb, off);
|
|
if (skb_gro_header_hard(skb, hlen)) {
|
|
eth = skb_gro_header_slow(skb, hlen, off);
|
|
if (unlikely(!eth)) {
|
|
napi_reuse_skb(napi, skb);
|
|
skb = NULL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
skb_gro_pull(skb, sizeof(*eth));
|
|
|
|
/*
|
|
* This works because the only protocols we care about don't require
|
|
* special handling. We'll fix it up properly at the end.
|
|
*/
|
|
skb->protocol = eth->h_proto;
|
|
|
|
out:
|
|
return skb;
|
|
}
|
|
|
|
gro_result_t napi_gro_frags(struct napi_struct *napi)
|
|
{
|
|
struct sk_buff *skb = napi_frags_skb(napi);
|
|
|
|
if (!skb)
|
|
return GRO_DROP;
|
|
|
|
return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
|
|
}
|
|
EXPORT_SYMBOL(napi_gro_frags);
|
|
|
|
/*
|
|
* net_rps_action sends any pending IPI's for rps.
|
|
* Note: called with local irq disabled, but exits with local irq enabled.
|
|
*/
|
|
static void net_rps_action_and_irq_enable(struct softnet_data *sd)
|
|
{
|
|
#ifdef CONFIG_RPS
|
|
struct softnet_data *remsd = sd->rps_ipi_list;
|
|
|
|
if (remsd) {
|
|
sd->rps_ipi_list = NULL;
|
|
|
|
local_irq_enable();
|
|
|
|
/* Send pending IPI's to kick RPS processing on remote cpus. */
|
|
while (remsd) {
|
|
struct softnet_data *next = remsd->rps_ipi_next;
|
|
|
|
if (cpu_online(remsd->cpu))
|
|
__smp_call_function_single(remsd->cpu,
|
|
&remsd->csd, 0);
|
|
remsd = next;
|
|
}
|
|
} else
|
|
#endif
|
|
local_irq_enable();
|
|
}
|
|
|
|
static int process_backlog(struct napi_struct *napi, int quota)
|
|
{
|
|
int work = 0;
|
|
struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
|
|
|
|
#ifdef CONFIG_RPS
|
|
/* Check if we have pending ipi, its better to send them now,
|
|
* not waiting net_rx_action() end.
|
|
*/
|
|
if (sd->rps_ipi_list) {
|
|
local_irq_disable();
|
|
net_rps_action_and_irq_enable(sd);
|
|
}
|
|
#endif
|
|
napi->weight = weight_p;
|
|
local_irq_disable();
|
|
while (work < quota) {
|
|
struct sk_buff *skb;
|
|
unsigned int qlen;
|
|
|
|
while ((skb = __skb_dequeue(&sd->process_queue))) {
|
|
local_irq_enable();
|
|
__netif_receive_skb(skb);
|
|
local_irq_disable();
|
|
input_queue_head_incr(sd);
|
|
if (++work >= quota) {
|
|
local_irq_enable();
|
|
return work;
|
|
}
|
|
}
|
|
|
|
rps_lock(sd);
|
|
qlen = skb_queue_len(&sd->input_pkt_queue);
|
|
if (qlen)
|
|
skb_queue_splice_tail_init(&sd->input_pkt_queue,
|
|
&sd->process_queue);
|
|
|
|
if (qlen < quota - work) {
|
|
/*
|
|
* Inline a custom version of __napi_complete().
|
|
* only current cpu owns and manipulates this napi,
|
|
* and NAPI_STATE_SCHED is the only possible flag set on backlog.
|
|
* we can use a plain write instead of clear_bit(),
|
|
* and we dont need an smp_mb() memory barrier.
|
|
*/
|
|
list_del(&napi->poll_list);
|
|
napi->state = 0;
|
|
|
|
quota = work + qlen;
|
|
}
|
|
rps_unlock(sd);
|
|
}
|
|
local_irq_enable();
|
|
|
|
return work;
|
|
}
|
|
|
|
/**
|
|
* __napi_schedule - schedule for receive
|
|
* @n: entry to schedule
|
|
*
|
|
* The entry's receive function will be scheduled to run
|
|
*/
|
|
void __napi_schedule(struct napi_struct *n)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
____napi_schedule(&__get_cpu_var(softnet_data), n);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(__napi_schedule);
|
|
|
|
void __napi_complete(struct napi_struct *n)
|
|
{
|
|
BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
|
|
BUG_ON(n->gro_list);
|
|
|
|
list_del(&n->poll_list);
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(NAPI_STATE_SCHED, &n->state);
|
|
}
|
|
EXPORT_SYMBOL(__napi_complete);
|
|
|
|
void napi_complete(struct napi_struct *n)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* don't let napi dequeue from the cpu poll list
|
|
* just in case its running on a different cpu
|
|
*/
|
|
if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
|
|
return;
|
|
|
|
napi_gro_flush(n);
|
|
local_irq_save(flags);
|
|
__napi_complete(n);
|
|
local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(napi_complete);
|
|
|
|
void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
|
|
int (*poll)(struct napi_struct *, int), int weight)
|
|
{
|
|
INIT_LIST_HEAD(&napi->poll_list);
|
|
napi->gro_count = 0;
|
|
napi->gro_list = NULL;
|
|
napi->skb = NULL;
|
|
napi->poll = poll;
|
|
napi->weight = weight;
|
|
list_add(&napi->dev_list, &dev->napi_list);
|
|
napi->dev = dev;
|
|
#ifdef CONFIG_NETPOLL
|
|
spin_lock_init(&napi->poll_lock);
|
|
napi->poll_owner = -1;
|
|
#endif
|
|
set_bit(NAPI_STATE_SCHED, &napi->state);
|
|
}
|
|
EXPORT_SYMBOL(netif_napi_add);
|
|
|
|
void netif_napi_del(struct napi_struct *napi)
|
|
{
|
|
struct sk_buff *skb, *next;
|
|
|
|
list_del_init(&napi->dev_list);
|
|
napi_free_frags(napi);
|
|
|
|
for (skb = napi->gro_list; skb; skb = next) {
|
|
next = skb->next;
|
|
skb->next = NULL;
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
napi->gro_list = NULL;
|
|
napi->gro_count = 0;
|
|
}
|
|
EXPORT_SYMBOL(netif_napi_del);
|
|
|
|
static void net_rx_action(struct softirq_action *h)
|
|
{
|
|
struct softnet_data *sd = &__get_cpu_var(softnet_data);
|
|
unsigned long time_limit = jiffies + 2;
|
|
int budget = netdev_budget;
|
|
void *have;
|
|
|
|
local_irq_disable();
|
|
|
|
while (!list_empty(&sd->poll_list)) {
|
|
struct napi_struct *n;
|
|
int work, weight;
|
|
|
|
/* If softirq window is exhuasted then punt.
|
|
* Allow this to run for 2 jiffies since which will allow
|
|
* an average latency of 1.5/HZ.
|
|
*/
|
|
if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
|
|
goto softnet_break;
|
|
|
|
local_irq_enable();
|
|
|
|
/* Even though interrupts have been re-enabled, this
|
|
* access is safe because interrupts can only add new
|
|
* entries to the tail of this list, and only ->poll()
|
|
* calls can remove this head entry from the list.
|
|
*/
|
|
n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
|
|
|
|
have = netpoll_poll_lock(n);
|
|
|
|
weight = n->weight;
|
|
|
|
/* This NAPI_STATE_SCHED test is for avoiding a race
|
|
* with netpoll's poll_napi(). Only the entity which
|
|
* obtains the lock and sees NAPI_STATE_SCHED set will
|
|
* actually make the ->poll() call. Therefore we avoid
|
|
* accidentally calling ->poll() when NAPI is not scheduled.
|
|
*/
|
|
work = 0;
|
|
if (test_bit(NAPI_STATE_SCHED, &n->state)) {
|
|
work = n->poll(n, weight);
|
|
trace_napi_poll(n);
|
|
}
|
|
|
|
WARN_ON_ONCE(work > weight);
|
|
|
|
budget -= work;
|
|
|
|
local_irq_disable();
|
|
|
|
/* Drivers must not modify the NAPI state if they
|
|
* consume the entire weight. In such cases this code
|
|
* still "owns" the NAPI instance and therefore can
|
|
* move the instance around on the list at-will.
|
|
*/
|
|
if (unlikely(work == weight)) {
|
|
if (unlikely(napi_disable_pending(n))) {
|
|
local_irq_enable();
|
|
napi_complete(n);
|
|
local_irq_disable();
|
|
} else
|
|
list_move_tail(&n->poll_list, &sd->poll_list);
|
|
}
|
|
|
|
netpoll_poll_unlock(have);
|
|
}
|
|
out:
|
|
net_rps_action_and_irq_enable(sd);
|
|
|
|
#ifdef CONFIG_NET_DMA
|
|
/*
|
|
* There may not be any more sk_buffs coming right now, so push
|
|
* any pending DMA copies to hardware
|
|
*/
|
|
dma_issue_pending_all();
|
|
#endif
|
|
|
|
return;
|
|
|
|
softnet_break:
|
|
sd->time_squeeze++;
|
|
__raise_softirq_irqoff(NET_RX_SOFTIRQ);
|
|
goto out;
|
|
}
|
|
|
|
static gifconf_func_t *gifconf_list[NPROTO];
|
|
|
|
/**
|
|
* register_gifconf - register a SIOCGIF handler
|
|
* @family: Address family
|
|
* @gifconf: Function handler
|
|
*
|
|
* Register protocol dependent address dumping routines. The handler
|
|
* that is passed must not be freed or reused until it has been replaced
|
|
* by another handler.
|
|
*/
|
|
int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
|
|
{
|
|
if (family >= NPROTO)
|
|
return -EINVAL;
|
|
gifconf_list[family] = gifconf;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(register_gifconf);
|
|
|
|
|
|
/*
|
|
* Map an interface index to its name (SIOCGIFNAME)
|
|
*/
|
|
|
|
/*
|
|
* We need this ioctl for efficient implementation of the
|
|
* if_indextoname() function required by the IPv6 API. Without
|
|
* it, we would have to search all the interfaces to find a
|
|
* match. --pb
|
|
*/
|
|
|
|
static int dev_ifname(struct net *net, struct ifreq __user *arg)
|
|
{
|
|
struct net_device *dev;
|
|
struct ifreq ifr;
|
|
|
|
/*
|
|
* Fetch the caller's info block.
|
|
*/
|
|
|
|
if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
|
|
return -EFAULT;
|
|
|
|
rcu_read_lock();
|
|
dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
|
|
if (!dev) {
|
|
rcu_read_unlock();
|
|
return -ENODEV;
|
|
}
|
|
|
|
strcpy(ifr.ifr_name, dev->name);
|
|
rcu_read_unlock();
|
|
|
|
if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Perform a SIOCGIFCONF call. This structure will change
|
|
* size eventually, and there is nothing I can do about it.
|
|
* Thus we will need a 'compatibility mode'.
|
|
*/
|
|
|
|
static int dev_ifconf(struct net *net, char __user *arg)
|
|
{
|
|
struct ifconf ifc;
|
|
struct net_device *dev;
|
|
char __user *pos;
|
|
int len;
|
|
int total;
|
|
int i;
|
|
|
|
/*
|
|
* Fetch the caller's info block.
|
|
*/
|
|
|
|
if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
|
|
return -EFAULT;
|
|
|
|
pos = ifc.ifc_buf;
|
|
len = ifc.ifc_len;
|
|
|
|
/*
|
|
* Loop over the interfaces, and write an info block for each.
|
|
*/
|
|
|
|
total = 0;
|
|
for_each_netdev(net, dev) {
|
|
for (i = 0; i < NPROTO; i++) {
|
|
if (gifconf_list[i]) {
|
|
int done;
|
|
if (!pos)
|
|
done = gifconf_list[i](dev, NULL, 0);
|
|
else
|
|
done = gifconf_list[i](dev, pos + total,
|
|
len - total);
|
|
if (done < 0)
|
|
return -EFAULT;
|
|
total += done;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* All done. Write the updated control block back to the caller.
|
|
*/
|
|
ifc.ifc_len = total;
|
|
|
|
/*
|
|
* Both BSD and Solaris return 0 here, so we do too.
|
|
*/
|
|
return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
#define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
|
|
|
|
#define get_bucket(x) ((x) >> BUCKET_SPACE)
|
|
#define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
|
|
#define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
|
|
|
|
static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct net *net = seq_file_net(seq);
|
|
struct net_device *dev;
|
|
struct hlist_node *p;
|
|
struct hlist_head *h;
|
|
unsigned int count = 0, offset = get_offset(*pos);
|
|
|
|
h = &net->dev_name_head[get_bucket(*pos)];
|
|
hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
|
|
if (++count == offset)
|
|
return dev;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct net_device *dev;
|
|
unsigned int bucket;
|
|
|
|
do {
|
|
dev = dev_from_same_bucket(seq, pos);
|
|
if (dev)
|
|
return dev;
|
|
|
|
bucket = get_bucket(*pos) + 1;
|
|
*pos = set_bucket_offset(bucket, 1);
|
|
} while (bucket < NETDEV_HASHENTRIES);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* This is invoked by the /proc filesystem handler to display a device
|
|
* in detail.
|
|
*/
|
|
void *dev_seq_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(RCU)
|
|
{
|
|
rcu_read_lock();
|
|
if (!*pos)
|
|
return SEQ_START_TOKEN;
|
|
|
|
if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
|
|
return NULL;
|
|
|
|
return dev_from_bucket(seq, pos);
|
|
}
|
|
|
|
void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
++*pos;
|
|
return dev_from_bucket(seq, pos);
|
|
}
|
|
|
|
void dev_seq_stop(struct seq_file *seq, void *v)
|
|
__releases(RCU)
|
|
{
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
|
|
{
|
|
struct rtnl_link_stats64 temp;
|
|
const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
|
|
|
|
seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
|
|
"%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
|
|
dev->name, stats->rx_bytes, stats->rx_packets,
|
|
stats->rx_errors,
|
|
stats->rx_dropped + stats->rx_missed_errors,
|
|
stats->rx_fifo_errors,
|
|
stats->rx_length_errors + stats->rx_over_errors +
|
|
stats->rx_crc_errors + stats->rx_frame_errors,
|
|
stats->rx_compressed, stats->multicast,
|
|
stats->tx_bytes, stats->tx_packets,
|
|
stats->tx_errors, stats->tx_dropped,
|
|
stats->tx_fifo_errors, stats->collisions,
|
|
stats->tx_carrier_errors +
|
|
stats->tx_aborted_errors +
|
|
stats->tx_window_errors +
|
|
stats->tx_heartbeat_errors,
|
|
stats->tx_compressed);
|
|
}
|
|
|
|
/*
|
|
* Called from the PROCfs module. This now uses the new arbitrary sized
|
|
* /proc/net interface to create /proc/net/dev
|
|
*/
|
|
static int dev_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq, "Inter-| Receive "
|
|
" | Transmit\n"
|
|
" face |bytes packets errs drop fifo frame "
|
|
"compressed multicast|bytes packets errs "
|
|
"drop fifo colls carrier compressed\n");
|
|
else
|
|
dev_seq_printf_stats(seq, v);
|
|
return 0;
|
|
}
|
|
|
|
static struct softnet_data *softnet_get_online(loff_t *pos)
|
|
{
|
|
struct softnet_data *sd = NULL;
|
|
|
|
while (*pos < nr_cpu_ids)
|
|
if (cpu_online(*pos)) {
|
|
sd = &per_cpu(softnet_data, *pos);
|
|
break;
|
|
} else
|
|
++*pos;
|
|
return sd;
|
|
}
|
|
|
|
static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
return softnet_get_online(pos);
|
|
}
|
|
|
|
static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
++*pos;
|
|
return softnet_get_online(pos);
|
|
}
|
|
|
|
static void softnet_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
}
|
|
|
|
static int softnet_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct softnet_data *sd = v;
|
|
|
|
seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
|
|
sd->processed, sd->dropped, sd->time_squeeze, 0,
|
|
0, 0, 0, 0, /* was fastroute */
|
|
sd->cpu_collision, sd->received_rps);
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations dev_seq_ops = {
|
|
.start = dev_seq_start,
|
|
.next = dev_seq_next,
|
|
.stop = dev_seq_stop,
|
|
.show = dev_seq_show,
|
|
};
|
|
|
|
static int dev_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_net(inode, file, &dev_seq_ops,
|
|
sizeof(struct seq_net_private));
|
|
}
|
|
|
|
static const struct file_operations dev_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = dev_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
static const struct seq_operations softnet_seq_ops = {
|
|
.start = softnet_seq_start,
|
|
.next = softnet_seq_next,
|
|
.stop = softnet_seq_stop,
|
|
.show = softnet_seq_show,
|
|
};
|
|
|
|
static int softnet_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &softnet_seq_ops);
|
|
}
|
|
|
|
static const struct file_operations softnet_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = softnet_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static void *ptype_get_idx(loff_t pos)
|
|
{
|
|
struct packet_type *pt = NULL;
|
|
loff_t i = 0;
|
|
int t;
|
|
|
|
list_for_each_entry_rcu(pt, &ptype_all, list) {
|
|
if (i == pos)
|
|
return pt;
|
|
++i;
|
|
}
|
|
|
|
for (t = 0; t < PTYPE_HASH_SIZE; t++) {
|
|
list_for_each_entry_rcu(pt, &ptype_base[t], list) {
|
|
if (i == pos)
|
|
return pt;
|
|
++i;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(RCU)
|
|
{
|
|
rcu_read_lock();
|
|
return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
|
|
}
|
|
|
|
static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct packet_type *pt;
|
|
struct list_head *nxt;
|
|
int hash;
|
|
|
|
++*pos;
|
|
if (v == SEQ_START_TOKEN)
|
|
return ptype_get_idx(0);
|
|
|
|
pt = v;
|
|
nxt = pt->list.next;
|
|
if (pt->type == htons(ETH_P_ALL)) {
|
|
if (nxt != &ptype_all)
|
|
goto found;
|
|
hash = 0;
|
|
nxt = ptype_base[0].next;
|
|
} else
|
|
hash = ntohs(pt->type) & PTYPE_HASH_MASK;
|
|
|
|
while (nxt == &ptype_base[hash]) {
|
|
if (++hash >= PTYPE_HASH_SIZE)
|
|
return NULL;
|
|
nxt = ptype_base[hash].next;
|
|
}
|
|
found:
|
|
return list_entry(nxt, struct packet_type, list);
|
|
}
|
|
|
|
static void ptype_seq_stop(struct seq_file *seq, void *v)
|
|
__releases(RCU)
|
|
{
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static int ptype_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct packet_type *pt = v;
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq, "Type Device Function\n");
|
|
else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
|
|
if (pt->type == htons(ETH_P_ALL))
|
|
seq_puts(seq, "ALL ");
|
|
else
|
|
seq_printf(seq, "%04x", ntohs(pt->type));
|
|
|
|
seq_printf(seq, " %-8s %pF\n",
|
|
pt->dev ? pt->dev->name : "", pt->func);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations ptype_seq_ops = {
|
|
.start = ptype_seq_start,
|
|
.next = ptype_seq_next,
|
|
.stop = ptype_seq_stop,
|
|
.show = ptype_seq_show,
|
|
};
|
|
|
|
static int ptype_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_net(inode, file, &ptype_seq_ops,
|
|
sizeof(struct seq_net_private));
|
|
}
|
|
|
|
static const struct file_operations ptype_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ptype_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
|
|
static int __net_init dev_proc_net_init(struct net *net)
|
|
{
|
|
int rc = -ENOMEM;
|
|
|
|
if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
|
|
goto out;
|
|
if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
|
|
goto out_dev;
|
|
if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
|
|
goto out_softnet;
|
|
|
|
if (wext_proc_init(net))
|
|
goto out_ptype;
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
out_ptype:
|
|
proc_net_remove(net, "ptype");
|
|
out_softnet:
|
|
proc_net_remove(net, "softnet_stat");
|
|
out_dev:
|
|
proc_net_remove(net, "dev");
|
|
goto out;
|
|
}
|
|
|
|
static void __net_exit dev_proc_net_exit(struct net *net)
|
|
{
|
|
wext_proc_exit(net);
|
|
|
|
proc_net_remove(net, "ptype");
|
|
proc_net_remove(net, "softnet_stat");
|
|
proc_net_remove(net, "dev");
|
|
}
|
|
|
|
static struct pernet_operations __net_initdata dev_proc_ops = {
|
|
.init = dev_proc_net_init,
|
|
.exit = dev_proc_net_exit,
|
|
};
|
|
|
|
static int __init dev_proc_init(void)
|
|
{
|
|
return register_pernet_subsys(&dev_proc_ops);
|
|
}
|
|
#else
|
|
#define dev_proc_init() 0
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
|
|
/**
|
|
* netdev_set_master - set up master pointer
|
|
* @slave: slave device
|
|
* @master: new master device
|
|
*
|
|
* Changes the master device of the slave. Pass %NULL to break the
|
|
* bonding. The caller must hold the RTNL semaphore. On a failure
|
|
* a negative errno code is returned. On success the reference counts
|
|
* are adjusted and the function returns zero.
|
|
*/
|
|
int netdev_set_master(struct net_device *slave, struct net_device *master)
|
|
{
|
|
struct net_device *old = slave->master;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (master) {
|
|
if (old)
|
|
return -EBUSY;
|
|
dev_hold(master);
|
|
}
|
|
|
|
slave->master = master;
|
|
|
|
if (old)
|
|
dev_put(old);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(netdev_set_master);
|
|
|
|
/**
|
|
* netdev_set_bond_master - set up bonding master/slave pair
|
|
* @slave: slave device
|
|
* @master: new master device
|
|
*
|
|
* Changes the master device of the slave. Pass %NULL to break the
|
|
* bonding. The caller must hold the RTNL semaphore. On a failure
|
|
* a negative errno code is returned. On success %RTM_NEWLINK is sent
|
|
* to the routing socket and the function returns zero.
|
|
*/
|
|
int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
|
|
{
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
err = netdev_set_master(slave, master);
|
|
if (err)
|
|
return err;
|
|
if (master)
|
|
slave->flags |= IFF_SLAVE;
|
|
else
|
|
slave->flags &= ~IFF_SLAVE;
|
|
|
|
rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(netdev_set_bond_master);
|
|
|
|
static void dev_change_rx_flags(struct net_device *dev, int flags)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
|
|
ops->ndo_change_rx_flags(dev, flags);
|
|
}
|
|
|
|
static int __dev_set_promiscuity(struct net_device *dev, int inc)
|
|
{
|
|
unsigned int old_flags = dev->flags;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
dev->flags |= IFF_PROMISC;
|
|
dev->promiscuity += inc;
|
|
if (dev->promiscuity == 0) {
|
|
/*
|
|
* Avoid overflow.
|
|
* If inc causes overflow, untouch promisc and return error.
|
|
*/
|
|
if (inc < 0)
|
|
dev->flags &= ~IFF_PROMISC;
|
|
else {
|
|
dev->promiscuity -= inc;
|
|
pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
|
|
dev->name);
|
|
return -EOVERFLOW;
|
|
}
|
|
}
|
|
if (dev->flags != old_flags) {
|
|
pr_info("device %s %s promiscuous mode\n",
|
|
dev->name,
|
|
dev->flags & IFF_PROMISC ? "entered" : "left");
|
|
if (audit_enabled) {
|
|
current_uid_gid(&uid, &gid);
|
|
audit_log(current->audit_context, GFP_ATOMIC,
|
|
AUDIT_ANOM_PROMISCUOUS,
|
|
"dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
|
|
dev->name, (dev->flags & IFF_PROMISC),
|
|
(old_flags & IFF_PROMISC),
|
|
audit_get_loginuid(current),
|
|
uid, gid,
|
|
audit_get_sessionid(current));
|
|
}
|
|
|
|
dev_change_rx_flags(dev, IFF_PROMISC);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dev_set_promiscuity - update promiscuity count on a device
|
|
* @dev: device
|
|
* @inc: modifier
|
|
*
|
|
* Add or remove promiscuity from a device. While the count in the device
|
|
* remains above zero the interface remains promiscuous. Once it hits zero
|
|
* the device reverts back to normal filtering operation. A negative inc
|
|
* value is used to drop promiscuity on the device.
|
|
* Return 0 if successful or a negative errno code on error.
|
|
*/
|
|
int dev_set_promiscuity(struct net_device *dev, int inc)
|
|
{
|
|
unsigned int old_flags = dev->flags;
|
|
int err;
|
|
|
|
err = __dev_set_promiscuity(dev, inc);
|
|
if (err < 0)
|
|
return err;
|
|
if (dev->flags != old_flags)
|
|
dev_set_rx_mode(dev);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(dev_set_promiscuity);
|
|
|
|
/**
|
|
* dev_set_allmulti - update allmulti count on a device
|
|
* @dev: device
|
|
* @inc: modifier
|
|
*
|
|
* Add or remove reception of all multicast frames to a device. While the
|
|
* count in the device remains above zero the interface remains listening
|
|
* to all interfaces. Once it hits zero the device reverts back to normal
|
|
* filtering operation. A negative @inc value is used to drop the counter
|
|
* when releasing a resource needing all multicasts.
|
|
* Return 0 if successful or a negative errno code on error.
|
|
*/
|
|
|
|
int dev_set_allmulti(struct net_device *dev, int inc)
|
|
{
|
|
unsigned int old_flags = dev->flags;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
dev->flags |= IFF_ALLMULTI;
|
|
dev->allmulti += inc;
|
|
if (dev->allmulti == 0) {
|
|
/*
|
|
* Avoid overflow.
|
|
* If inc causes overflow, untouch allmulti and return error.
|
|
*/
|
|
if (inc < 0)
|
|
dev->flags &= ~IFF_ALLMULTI;
|
|
else {
|
|
dev->allmulti -= inc;
|
|
pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
|
|
dev->name);
|
|
return -EOVERFLOW;
|
|
}
|
|
}
|
|
if (dev->flags ^ old_flags) {
|
|
dev_change_rx_flags(dev, IFF_ALLMULTI);
|
|
dev_set_rx_mode(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(dev_set_allmulti);
|
|
|
|
/*
|
|
* Upload unicast and multicast address lists to device and
|
|
* configure RX filtering. When the device doesn't support unicast
|
|
* filtering it is put in promiscuous mode while unicast addresses
|
|
* are present.
|
|
*/
|
|
void __dev_set_rx_mode(struct net_device *dev)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
/* dev_open will call this function so the list will stay sane. */
|
|
if (!(dev->flags&IFF_UP))
|
|
return;
|
|
|
|
if (!netif_device_present(dev))
|
|
return;
|
|
|
|
if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
|
|
/* Unicast addresses changes may only happen under the rtnl,
|
|
* therefore calling __dev_set_promiscuity here is safe.
|
|
*/
|
|
if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
|
|
__dev_set_promiscuity(dev, 1);
|
|
dev->uc_promisc = true;
|
|
} else if (netdev_uc_empty(dev) && dev->uc_promisc) {
|
|
__dev_set_promiscuity(dev, -1);
|
|
dev->uc_promisc = false;
|
|
}
|
|
}
|
|
|
|
if (ops->ndo_set_rx_mode)
|
|
ops->ndo_set_rx_mode(dev);
|
|
}
|
|
|
|
void dev_set_rx_mode(struct net_device *dev)
|
|
{
|
|
netif_addr_lock_bh(dev);
|
|
__dev_set_rx_mode(dev);
|
|
netif_addr_unlock_bh(dev);
|
|
}
|
|
|
|
/**
|
|
* dev_get_flags - get flags reported to userspace
|
|
* @dev: device
|
|
*
|
|
* Get the combination of flag bits exported through APIs to userspace.
|
|
*/
|
|
unsigned int dev_get_flags(const struct net_device *dev)
|
|
{
|
|
unsigned int flags;
|
|
|
|
flags = (dev->flags & ~(IFF_PROMISC |
|
|
IFF_ALLMULTI |
|
|
IFF_RUNNING |
|
|
IFF_LOWER_UP |
|
|
IFF_DORMANT)) |
|
|
(dev->gflags & (IFF_PROMISC |
|
|
IFF_ALLMULTI));
|
|
|
|
if (netif_running(dev)) {
|
|
if (netif_oper_up(dev))
|
|
flags |= IFF_RUNNING;
|
|
if (netif_carrier_ok(dev))
|
|
flags |= IFF_LOWER_UP;
|
|
if (netif_dormant(dev))
|
|
flags |= IFF_DORMANT;
|
|
}
|
|
|
|
return flags;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_flags);
|
|
|
|
int __dev_change_flags(struct net_device *dev, unsigned int flags)
|
|
{
|
|
unsigned int old_flags = dev->flags;
|
|
int ret;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/*
|
|
* Set the flags on our device.
|
|
*/
|
|
|
|
dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
|
|
IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
|
|
IFF_AUTOMEDIA)) |
|
|
(dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
|
|
IFF_ALLMULTI));
|
|
|
|
/*
|
|
* Load in the correct multicast list now the flags have changed.
|
|
*/
|
|
|
|
if ((old_flags ^ flags) & IFF_MULTICAST)
|
|
dev_change_rx_flags(dev, IFF_MULTICAST);
|
|
|
|
dev_set_rx_mode(dev);
|
|
|
|
/*
|
|
* Have we downed the interface. We handle IFF_UP ourselves
|
|
* according to user attempts to set it, rather than blindly
|
|
* setting it.
|
|
*/
|
|
|
|
ret = 0;
|
|
if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
|
|
ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
|
|
|
|
if (!ret)
|
|
dev_set_rx_mode(dev);
|
|
}
|
|
|
|
if ((flags ^ dev->gflags) & IFF_PROMISC) {
|
|
int inc = (flags & IFF_PROMISC) ? 1 : -1;
|
|
|
|
dev->gflags ^= IFF_PROMISC;
|
|
dev_set_promiscuity(dev, inc);
|
|
}
|
|
|
|
/* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
|
|
is important. Some (broken) drivers set IFF_PROMISC, when
|
|
IFF_ALLMULTI is requested not asking us and not reporting.
|
|
*/
|
|
if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
|
|
int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
|
|
|
|
dev->gflags ^= IFF_ALLMULTI;
|
|
dev_set_allmulti(dev, inc);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
|
|
{
|
|
unsigned int changes = dev->flags ^ old_flags;
|
|
|
|
if (changes & IFF_UP) {
|
|
if (dev->flags & IFF_UP)
|
|
call_netdevice_notifiers(NETDEV_UP, dev);
|
|
else
|
|
call_netdevice_notifiers(NETDEV_DOWN, dev);
|
|
}
|
|
|
|
if (dev->flags & IFF_UP &&
|
|
(changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
|
|
call_netdevice_notifiers(NETDEV_CHANGE, dev);
|
|
}
|
|
|
|
/**
|
|
* dev_change_flags - change device settings
|
|
* @dev: device
|
|
* @flags: device state flags
|
|
*
|
|
* Change settings on device based state flags. The flags are
|
|
* in the userspace exported format.
|
|
*/
|
|
int dev_change_flags(struct net_device *dev, unsigned int flags)
|
|
{
|
|
int ret;
|
|
unsigned int changes, old_flags = dev->flags;
|
|
|
|
ret = __dev_change_flags(dev, flags);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
changes = old_flags ^ dev->flags;
|
|
if (changes)
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
|
|
|
|
__dev_notify_flags(dev, old_flags);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(dev_change_flags);
|
|
|
|
/**
|
|
* dev_set_mtu - Change maximum transfer unit
|
|
* @dev: device
|
|
* @new_mtu: new transfer unit
|
|
*
|
|
* Change the maximum transfer size of the network device.
|
|
*/
|
|
int dev_set_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
int err;
|
|
|
|
if (new_mtu == dev->mtu)
|
|
return 0;
|
|
|
|
/* MTU must be positive. */
|
|
if (new_mtu < 0)
|
|
return -EINVAL;
|
|
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
|
|
err = 0;
|
|
if (ops->ndo_change_mtu)
|
|
err = ops->ndo_change_mtu(dev, new_mtu);
|
|
else
|
|
dev->mtu = new_mtu;
|
|
|
|
if (!err && dev->flags & IFF_UP)
|
|
call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(dev_set_mtu);
|
|
|
|
/**
|
|
* dev_set_group - Change group this device belongs to
|
|
* @dev: device
|
|
* @new_group: group this device should belong to
|
|
*/
|
|
void dev_set_group(struct net_device *dev, int new_group)
|
|
{
|
|
dev->group = new_group;
|
|
}
|
|
EXPORT_SYMBOL(dev_set_group);
|
|
|
|
/**
|
|
* dev_set_mac_address - Change Media Access Control Address
|
|
* @dev: device
|
|
* @sa: new address
|
|
*
|
|
* Change the hardware (MAC) address of the device
|
|
*/
|
|
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
int err;
|
|
|
|
if (!ops->ndo_set_mac_address)
|
|
return -EOPNOTSUPP;
|
|
if (sa->sa_family != dev->type)
|
|
return -EINVAL;
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
err = ops->ndo_set_mac_address(dev, sa);
|
|
if (!err)
|
|
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(dev_set_mac_address);
|
|
|
|
/*
|
|
* Perform the SIOCxIFxxx calls, inside rcu_read_lock()
|
|
*/
|
|
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
|
|
{
|
|
int err;
|
|
struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
switch (cmd) {
|
|
case SIOCGIFFLAGS: /* Get interface flags */
|
|
ifr->ifr_flags = (short) dev_get_flags(dev);
|
|
return 0;
|
|
|
|
case SIOCGIFMETRIC: /* Get the metric on the interface
|
|
(currently unused) */
|
|
ifr->ifr_metric = 0;
|
|
return 0;
|
|
|
|
case SIOCGIFMTU: /* Get the MTU of a device */
|
|
ifr->ifr_mtu = dev->mtu;
|
|
return 0;
|
|
|
|
case SIOCGIFHWADDR:
|
|
if (!dev->addr_len)
|
|
memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
|
|
else
|
|
memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
|
|
min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
|
|
ifr->ifr_hwaddr.sa_family = dev->type;
|
|
return 0;
|
|
|
|
case SIOCGIFSLAVE:
|
|
err = -EINVAL;
|
|
break;
|
|
|
|
case SIOCGIFMAP:
|
|
ifr->ifr_map.mem_start = dev->mem_start;
|
|
ifr->ifr_map.mem_end = dev->mem_end;
|
|
ifr->ifr_map.base_addr = dev->base_addr;
|
|
ifr->ifr_map.irq = dev->irq;
|
|
ifr->ifr_map.dma = dev->dma;
|
|
ifr->ifr_map.port = dev->if_port;
|
|
return 0;
|
|
|
|
case SIOCGIFINDEX:
|
|
ifr->ifr_ifindex = dev->ifindex;
|
|
return 0;
|
|
|
|
case SIOCGIFTXQLEN:
|
|
ifr->ifr_qlen = dev->tx_queue_len;
|
|
return 0;
|
|
|
|
default:
|
|
/* dev_ioctl() should ensure this case
|
|
* is never reached
|
|
*/
|
|
WARN_ON(1);
|
|
err = -ENOTTY;
|
|
break;
|
|
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Perform the SIOCxIFxxx calls, inside rtnl_lock()
|
|
*/
|
|
static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
|
|
{
|
|
int err;
|
|
struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
|
|
const struct net_device_ops *ops;
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
ops = dev->netdev_ops;
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFFLAGS: /* Set interface flags */
|
|
return dev_change_flags(dev, ifr->ifr_flags);
|
|
|
|
case SIOCSIFMETRIC: /* Set the metric on the interface
|
|
(currently unused) */
|
|
return -EOPNOTSUPP;
|
|
|
|
case SIOCSIFMTU: /* Set the MTU of a device */
|
|
return dev_set_mtu(dev, ifr->ifr_mtu);
|
|
|
|
case SIOCSIFHWADDR:
|
|
return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
|
|
|
|
case SIOCSIFHWBROADCAST:
|
|
if (ifr->ifr_hwaddr.sa_family != dev->type)
|
|
return -EINVAL;
|
|
memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
|
|
min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
|
|
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
|
|
return 0;
|
|
|
|
case SIOCSIFMAP:
|
|
if (ops->ndo_set_config) {
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
return ops->ndo_set_config(dev, &ifr->ifr_map);
|
|
}
|
|
return -EOPNOTSUPP;
|
|
|
|
case SIOCADDMULTI:
|
|
if (!ops->ndo_set_rx_mode ||
|
|
ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
|
|
return -EINVAL;
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
|
|
|
|
case SIOCDELMULTI:
|
|
if (!ops->ndo_set_rx_mode ||
|
|
ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
|
|
return -EINVAL;
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
|
|
|
|
case SIOCSIFTXQLEN:
|
|
if (ifr->ifr_qlen < 0)
|
|
return -EINVAL;
|
|
dev->tx_queue_len = ifr->ifr_qlen;
|
|
return 0;
|
|
|
|
case SIOCSIFNAME:
|
|
ifr->ifr_newname[IFNAMSIZ-1] = '\0';
|
|
return dev_change_name(dev, ifr->ifr_newname);
|
|
|
|
case SIOCSHWTSTAMP:
|
|
err = net_hwtstamp_validate(ifr);
|
|
if (err)
|
|
return err;
|
|
/* fall through */
|
|
|
|
/*
|
|
* Unknown or private ioctl
|
|
*/
|
|
default:
|
|
if ((cmd >= SIOCDEVPRIVATE &&
|
|
cmd <= SIOCDEVPRIVATE + 15) ||
|
|
cmd == SIOCBONDENSLAVE ||
|
|
cmd == SIOCBONDRELEASE ||
|
|
cmd == SIOCBONDSETHWADDR ||
|
|
cmd == SIOCBONDSLAVEINFOQUERY ||
|
|
cmd == SIOCBONDINFOQUERY ||
|
|
cmd == SIOCBONDCHANGEACTIVE ||
|
|
cmd == SIOCGMIIPHY ||
|
|
cmd == SIOCGMIIREG ||
|
|
cmd == SIOCSMIIREG ||
|
|
cmd == SIOCBRADDIF ||
|
|
cmd == SIOCBRDELIF ||
|
|
cmd == SIOCSHWTSTAMP ||
|
|
cmd == SIOCWANDEV) {
|
|
err = -EOPNOTSUPP;
|
|
if (ops->ndo_do_ioctl) {
|
|
if (netif_device_present(dev))
|
|
err = ops->ndo_do_ioctl(dev, ifr, cmd);
|
|
else
|
|
err = -ENODEV;
|
|
}
|
|
} else
|
|
err = -EINVAL;
|
|
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* This function handles all "interface"-type I/O control requests. The actual
|
|
* 'doing' part of this is dev_ifsioc above.
|
|
*/
|
|
|
|
/**
|
|
* dev_ioctl - network device ioctl
|
|
* @net: the applicable net namespace
|
|
* @cmd: command to issue
|
|
* @arg: pointer to a struct ifreq in user space
|
|
*
|
|
* Issue ioctl functions to devices. This is normally called by the
|
|
* user space syscall interfaces but can sometimes be useful for
|
|
* other purposes. The return value is the return from the syscall if
|
|
* positive or a negative errno code on error.
|
|
*/
|
|
|
|
int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
|
|
{
|
|
struct ifreq ifr;
|
|
int ret;
|
|
char *colon;
|
|
|
|
/* One special case: SIOCGIFCONF takes ifconf argument
|
|
and requires shared lock, because it sleeps writing
|
|
to user space.
|
|
*/
|
|
|
|
if (cmd == SIOCGIFCONF) {
|
|
rtnl_lock();
|
|
ret = dev_ifconf(net, (char __user *) arg);
|
|
rtnl_unlock();
|
|
return ret;
|
|
}
|
|
if (cmd == SIOCGIFNAME)
|
|
return dev_ifname(net, (struct ifreq __user *)arg);
|
|
|
|
if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
|
|
return -EFAULT;
|
|
|
|
ifr.ifr_name[IFNAMSIZ-1] = 0;
|
|
|
|
colon = strchr(ifr.ifr_name, ':');
|
|
if (colon)
|
|
*colon = 0;
|
|
|
|
/*
|
|
* See which interface the caller is talking about.
|
|
*/
|
|
|
|
switch (cmd) {
|
|
/*
|
|
* These ioctl calls:
|
|
* - can be done by all.
|
|
* - atomic and do not require locking.
|
|
* - return a value
|
|
*/
|
|
case SIOCGIFFLAGS:
|
|
case SIOCGIFMETRIC:
|
|
case SIOCGIFMTU:
|
|
case SIOCGIFHWADDR:
|
|
case SIOCGIFSLAVE:
|
|
case SIOCGIFMAP:
|
|
case SIOCGIFINDEX:
|
|
case SIOCGIFTXQLEN:
|
|
dev_load(net, ifr.ifr_name);
|
|
rcu_read_lock();
|
|
ret = dev_ifsioc_locked(net, &ifr, cmd);
|
|
rcu_read_unlock();
|
|
if (!ret) {
|
|
if (colon)
|
|
*colon = ':';
|
|
if (copy_to_user(arg, &ifr,
|
|
sizeof(struct ifreq)))
|
|
ret = -EFAULT;
|
|
}
|
|
return ret;
|
|
|
|
case SIOCETHTOOL:
|
|
dev_load(net, ifr.ifr_name);
|
|
rtnl_lock();
|
|
ret = dev_ethtool(net, &ifr);
|
|
rtnl_unlock();
|
|
if (!ret) {
|
|
if (colon)
|
|
*colon = ':';
|
|
if (copy_to_user(arg, &ifr,
|
|
sizeof(struct ifreq)))
|
|
ret = -EFAULT;
|
|
}
|
|
return ret;
|
|
|
|
/*
|
|
* These ioctl calls:
|
|
* - require superuser power.
|
|
* - require strict serialization.
|
|
* - return a value
|
|
*/
|
|
case SIOCGMIIPHY:
|
|
case SIOCGMIIREG:
|
|
case SIOCSIFNAME:
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
dev_load(net, ifr.ifr_name);
|
|
rtnl_lock();
|
|
ret = dev_ifsioc(net, &ifr, cmd);
|
|
rtnl_unlock();
|
|
if (!ret) {
|
|
if (colon)
|
|
*colon = ':';
|
|
if (copy_to_user(arg, &ifr,
|
|
sizeof(struct ifreq)))
|
|
ret = -EFAULT;
|
|
}
|
|
return ret;
|
|
|
|
/*
|
|
* These ioctl calls:
|
|
* - require superuser power.
|
|
* - require strict serialization.
|
|
* - do not return a value
|
|
*/
|
|
case SIOCSIFFLAGS:
|
|
case SIOCSIFMETRIC:
|
|
case SIOCSIFMTU:
|
|
case SIOCSIFMAP:
|
|
case SIOCSIFHWADDR:
|
|
case SIOCSIFSLAVE:
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
case SIOCSIFHWBROADCAST:
|
|
case SIOCSIFTXQLEN:
|
|
case SIOCSMIIREG:
|
|
case SIOCBONDENSLAVE:
|
|
case SIOCBONDRELEASE:
|
|
case SIOCBONDSETHWADDR:
|
|
case SIOCBONDCHANGEACTIVE:
|
|
case SIOCBRADDIF:
|
|
case SIOCBRDELIF:
|
|
case SIOCSHWTSTAMP:
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
/* fall through */
|
|
case SIOCBONDSLAVEINFOQUERY:
|
|
case SIOCBONDINFOQUERY:
|
|
dev_load(net, ifr.ifr_name);
|
|
rtnl_lock();
|
|
ret = dev_ifsioc(net, &ifr, cmd);
|
|
rtnl_unlock();
|
|
return ret;
|
|
|
|
case SIOCGIFMEM:
|
|
/* Get the per device memory space. We can add this but
|
|
* currently do not support it */
|
|
case SIOCSIFMEM:
|
|
/* Set the per device memory buffer space.
|
|
* Not applicable in our case */
|
|
case SIOCSIFLINK:
|
|
return -ENOTTY;
|
|
|
|
/*
|
|
* Unknown or private ioctl.
|
|
*/
|
|
default:
|
|
if (cmd == SIOCWANDEV ||
|
|
(cmd >= SIOCDEVPRIVATE &&
|
|
cmd <= SIOCDEVPRIVATE + 15)) {
|
|
dev_load(net, ifr.ifr_name);
|
|
rtnl_lock();
|
|
ret = dev_ifsioc(net, &ifr, cmd);
|
|
rtnl_unlock();
|
|
if (!ret && copy_to_user(arg, &ifr,
|
|
sizeof(struct ifreq)))
|
|
ret = -EFAULT;
|
|
return ret;
|
|
}
|
|
/* Take care of Wireless Extensions */
|
|
if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
|
|
return wext_handle_ioctl(net, &ifr, cmd, arg);
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* dev_new_index - allocate an ifindex
|
|
* @net: the applicable net namespace
|
|
*
|
|
* Returns a suitable unique value for a new device interface
|
|
* number. The caller must hold the rtnl semaphore or the
|
|
* dev_base_lock to be sure it remains unique.
|
|
*/
|
|
static int dev_new_index(struct net *net)
|
|
{
|
|
static int ifindex;
|
|
for (;;) {
|
|
if (++ifindex <= 0)
|
|
ifindex = 1;
|
|
if (!__dev_get_by_index(net, ifindex))
|
|
return ifindex;
|
|
}
|
|
}
|
|
|
|
/* Delayed registration/unregisteration */
|
|
static LIST_HEAD(net_todo_list);
|
|
|
|
static void net_set_todo(struct net_device *dev)
|
|
{
|
|
list_add_tail(&dev->todo_list, &net_todo_list);
|
|
}
|
|
|
|
static void rollback_registered_many(struct list_head *head)
|
|
{
|
|
struct net_device *dev, *tmp;
|
|
|
|
BUG_ON(dev_boot_phase);
|
|
ASSERT_RTNL();
|
|
|
|
list_for_each_entry_safe(dev, tmp, head, unreg_list) {
|
|
/* Some devices call without registering
|
|
* for initialization unwind. Remove those
|
|
* devices and proceed with the remaining.
|
|
*/
|
|
if (dev->reg_state == NETREG_UNINITIALIZED) {
|
|
pr_debug("unregister_netdevice: device %s/%p never was registered\n",
|
|
dev->name, dev);
|
|
|
|
WARN_ON(1);
|
|
list_del(&dev->unreg_list);
|
|
continue;
|
|
}
|
|
dev->dismantle = true;
|
|
BUG_ON(dev->reg_state != NETREG_REGISTERED);
|
|
}
|
|
|
|
/* If device is running, close it first. */
|
|
dev_close_many(head);
|
|
|
|
list_for_each_entry(dev, head, unreg_list) {
|
|
/* And unlink it from device chain. */
|
|
unlist_netdevice(dev);
|
|
|
|
dev->reg_state = NETREG_UNREGISTERING;
|
|
}
|
|
|
|
synchronize_net();
|
|
|
|
list_for_each_entry(dev, head, unreg_list) {
|
|
/* Shutdown queueing discipline. */
|
|
dev_shutdown(dev);
|
|
|
|
|
|
/* Notify protocols, that we are about to destroy
|
|
this device. They should clean all the things.
|
|
*/
|
|
call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
|
|
|
|
if (!dev->rtnl_link_ops ||
|
|
dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
|
|
rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
|
|
|
|
/*
|
|
* Flush the unicast and multicast chains
|
|
*/
|
|
dev_uc_flush(dev);
|
|
dev_mc_flush(dev);
|
|
|
|
if (dev->netdev_ops->ndo_uninit)
|
|
dev->netdev_ops->ndo_uninit(dev);
|
|
|
|
/* Notifier chain MUST detach us from master device. */
|
|
WARN_ON(dev->master);
|
|
|
|
/* Remove entries from kobject tree */
|
|
netdev_unregister_kobject(dev);
|
|
}
|
|
|
|
/* Process any work delayed until the end of the batch */
|
|
dev = list_first_entry(head, struct net_device, unreg_list);
|
|
call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
|
|
|
|
synchronize_net();
|
|
|
|
list_for_each_entry(dev, head, unreg_list)
|
|
dev_put(dev);
|
|
}
|
|
|
|
static void rollback_registered(struct net_device *dev)
|
|
{
|
|
LIST_HEAD(single);
|
|
|
|
list_add(&dev->unreg_list, &single);
|
|
rollback_registered_many(&single);
|
|
list_del(&single);
|
|
}
|
|
|
|
static netdev_features_t netdev_fix_features(struct net_device *dev,
|
|
netdev_features_t features)
|
|
{
|
|
/* Fix illegal checksum combinations */
|
|
if ((features & NETIF_F_HW_CSUM) &&
|
|
(features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
|
|
netdev_warn(dev, "mixed HW and IP checksum settings.\n");
|
|
features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
|
|
}
|
|
|
|
/* Fix illegal SG+CSUM combinations. */
|
|
if ((features & NETIF_F_SG) &&
|
|
!(features & NETIF_F_ALL_CSUM)) {
|
|
netdev_dbg(dev,
|
|
"Dropping NETIF_F_SG since no checksum feature.\n");
|
|
features &= ~NETIF_F_SG;
|
|
}
|
|
|
|
/* TSO requires that SG is present as well. */
|
|
if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
|
|
netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
|
|
features &= ~NETIF_F_ALL_TSO;
|
|
}
|
|
|
|
/* TSO ECN requires that TSO is present as well. */
|
|
if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
|
|
features &= ~NETIF_F_TSO_ECN;
|
|
|
|
/* Software GSO depends on SG. */
|
|
if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
|
|
netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
|
|
features &= ~NETIF_F_GSO;
|
|
}
|
|
|
|
/* UFO needs SG and checksumming */
|
|
if (features & NETIF_F_UFO) {
|
|
/* maybe split UFO into V4 and V6? */
|
|
if (!((features & NETIF_F_GEN_CSUM) ||
|
|
(features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
|
|
== (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
|
|
netdev_dbg(dev,
|
|
"Dropping NETIF_F_UFO since no checksum offload features.\n");
|
|
features &= ~NETIF_F_UFO;
|
|
}
|
|
|
|
if (!(features & NETIF_F_SG)) {
|
|
netdev_dbg(dev,
|
|
"Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
|
|
features &= ~NETIF_F_UFO;
|
|
}
|
|
}
|
|
|
|
return features;
|
|
}
|
|
|
|
int __netdev_update_features(struct net_device *dev)
|
|
{
|
|
netdev_features_t features;
|
|
int err = 0;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
features = netdev_get_wanted_features(dev);
|
|
|
|
if (dev->netdev_ops->ndo_fix_features)
|
|
features = dev->netdev_ops->ndo_fix_features(dev, features);
|
|
|
|
/* driver might be less strict about feature dependencies */
|
|
features = netdev_fix_features(dev, features);
|
|
|
|
if (dev->features == features)
|
|
return 0;
|
|
|
|
netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
|
|
&dev->features, &features);
|
|
|
|
if (dev->netdev_ops->ndo_set_features)
|
|
err = dev->netdev_ops->ndo_set_features(dev, features);
|
|
|
|
if (unlikely(err < 0)) {
|
|
netdev_err(dev,
|
|
"set_features() failed (%d); wanted %pNF, left %pNF\n",
|
|
err, &features, &dev->features);
|
|
return -1;
|
|
}
|
|
|
|
if (!err)
|
|
dev->features = features;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* netdev_update_features - recalculate device features
|
|
* @dev: the device to check
|
|
*
|
|
* Recalculate dev->features set and send notifications if it
|
|
* has changed. Should be called after driver or hardware dependent
|
|
* conditions might have changed that influence the features.
|
|
*/
|
|
void netdev_update_features(struct net_device *dev)
|
|
{
|
|
if (__netdev_update_features(dev))
|
|
netdev_features_change(dev);
|
|
}
|
|
EXPORT_SYMBOL(netdev_update_features);
|
|
|
|
/**
|
|
* netdev_change_features - recalculate device features
|
|
* @dev: the device to check
|
|
*
|
|
* Recalculate dev->features set and send notifications even
|
|
* if they have not changed. Should be called instead of
|
|
* netdev_update_features() if also dev->vlan_features might
|
|
* have changed to allow the changes to be propagated to stacked
|
|
* VLAN devices.
|
|
*/
|
|
void netdev_change_features(struct net_device *dev)
|
|
{
|
|
__netdev_update_features(dev);
|
|
netdev_features_change(dev);
|
|
}
|
|
EXPORT_SYMBOL(netdev_change_features);
|
|
|
|
/**
|
|
* netif_stacked_transfer_operstate - transfer operstate
|
|
* @rootdev: the root or lower level device to transfer state from
|
|
* @dev: the device to transfer operstate to
|
|
*
|
|
* Transfer operational state from root to device. This is normally
|
|
* called when a stacking relationship exists between the root
|
|
* device and the device(a leaf device).
|
|
*/
|
|
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
|
|
struct net_device *dev)
|
|
{
|
|
if (rootdev->operstate == IF_OPER_DORMANT)
|
|
netif_dormant_on(dev);
|
|
else
|
|
netif_dormant_off(dev);
|
|
|
|
if (netif_carrier_ok(rootdev)) {
|
|
if (!netif_carrier_ok(dev))
|
|
netif_carrier_on(dev);
|
|
} else {
|
|
if (netif_carrier_ok(dev))
|
|
netif_carrier_off(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(netif_stacked_transfer_operstate);
|
|
|
|
#ifdef CONFIG_RPS
|
|
static int netif_alloc_rx_queues(struct net_device *dev)
|
|
{
|
|
unsigned int i, count = dev->num_rx_queues;
|
|
struct netdev_rx_queue *rx;
|
|
|
|
BUG_ON(count < 1);
|
|
|
|
rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
|
|
if (!rx) {
|
|
pr_err("netdev: Unable to allocate %u rx queues\n", count);
|
|
return -ENOMEM;
|
|
}
|
|
dev->_rx = rx;
|
|
|
|
for (i = 0; i < count; i++)
|
|
rx[i].dev = dev;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static void netdev_init_one_queue(struct net_device *dev,
|
|
struct netdev_queue *queue, void *_unused)
|
|
{
|
|
/* Initialize queue lock */
|
|
spin_lock_init(&queue->_xmit_lock);
|
|
netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
|
|
queue->xmit_lock_owner = -1;
|
|
netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
|
|
queue->dev = dev;
|
|
#ifdef CONFIG_BQL
|
|
dql_init(&queue->dql, HZ);
|
|
#endif
|
|
}
|
|
|
|
static int netif_alloc_netdev_queues(struct net_device *dev)
|
|
{
|
|
unsigned int count = dev->num_tx_queues;
|
|
struct netdev_queue *tx;
|
|
|
|
BUG_ON(count < 1);
|
|
|
|
tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
|
|
if (!tx) {
|
|
pr_err("netdev: Unable to allocate %u tx queues\n", count);
|
|
return -ENOMEM;
|
|
}
|
|
dev->_tx = tx;
|
|
|
|
netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
|
|
spin_lock_init(&dev->tx_global_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* register_netdevice - register a network device
|
|
* @dev: device to register
|
|
*
|
|
* Take a completed network device structure and add it to the kernel
|
|
* interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
|
|
* chain. 0 is returned on success. A negative errno code is returned
|
|
* on a failure to set up the device, or if the name is a duplicate.
|
|
*
|
|
* Callers must hold the rtnl semaphore. You may want
|
|
* register_netdev() instead of this.
|
|
*
|
|
* BUGS:
|
|
* The locking appears insufficient to guarantee two parallel registers
|
|
* will not get the same name.
|
|
*/
|
|
|
|
int register_netdevice(struct net_device *dev)
|
|
{
|
|
int ret;
|
|
struct net *net = dev_net(dev);
|
|
|
|
BUG_ON(dev_boot_phase);
|
|
ASSERT_RTNL();
|
|
|
|
might_sleep();
|
|
|
|
/* When net_device's are persistent, this will be fatal. */
|
|
BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
|
|
BUG_ON(!net);
|
|
|
|
spin_lock_init(&dev->addr_list_lock);
|
|
netdev_set_addr_lockdep_class(dev);
|
|
|
|
dev->iflink = -1;
|
|
|
|
ret = dev_get_valid_name(dev, dev->name);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/* Init, if this function is available */
|
|
if (dev->netdev_ops->ndo_init) {
|
|
ret = dev->netdev_ops->ndo_init(dev);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
dev->ifindex = dev_new_index(net);
|
|
if (dev->iflink == -1)
|
|
dev->iflink = dev->ifindex;
|
|
|
|
/* Transfer changeable features to wanted_features and enable
|
|
* software offloads (GSO and GRO).
|
|
*/
|
|
dev->hw_features |= NETIF_F_SOFT_FEATURES;
|
|
dev->features |= NETIF_F_SOFT_FEATURES;
|
|
dev->wanted_features = dev->features & dev->hw_features;
|
|
|
|
/* Turn on no cache copy if HW is doing checksum */
|
|
if (!(dev->flags & IFF_LOOPBACK)) {
|
|
dev->hw_features |= NETIF_F_NOCACHE_COPY;
|
|
if (dev->features & NETIF_F_ALL_CSUM) {
|
|
dev->wanted_features |= NETIF_F_NOCACHE_COPY;
|
|
dev->features |= NETIF_F_NOCACHE_COPY;
|
|
}
|
|
}
|
|
|
|
/* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
|
|
*/
|
|
dev->vlan_features |= NETIF_F_HIGHDMA;
|
|
|
|
ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
|
|
ret = notifier_to_errno(ret);
|
|
if (ret)
|
|
goto err_uninit;
|
|
|
|
ret = netdev_register_kobject(dev);
|
|
if (ret)
|
|
goto err_uninit;
|
|
dev->reg_state = NETREG_REGISTERED;
|
|
|
|
__netdev_update_features(dev);
|
|
|
|
/*
|
|
* Default initial state at registry is that the
|
|
* device is present.
|
|
*/
|
|
|
|
set_bit(__LINK_STATE_PRESENT, &dev->state);
|
|
|
|
dev_init_scheduler(dev);
|
|
dev_hold(dev);
|
|
list_netdevice(dev);
|
|
|
|
/* Notify protocols, that a new device appeared. */
|
|
ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
|
|
ret = notifier_to_errno(ret);
|
|
if (ret) {
|
|
rollback_registered(dev);
|
|
dev->reg_state = NETREG_UNREGISTERED;
|
|
}
|
|
/*
|
|
* Prevent userspace races by waiting until the network
|
|
* device is fully setup before sending notifications.
|
|
*/
|
|
if (!dev->rtnl_link_ops ||
|
|
dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
|
|
|
|
out:
|
|
return ret;
|
|
|
|
err_uninit:
|
|
if (dev->netdev_ops->ndo_uninit)
|
|
dev->netdev_ops->ndo_uninit(dev);
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL(register_netdevice);
|
|
|
|
/**
|
|
* init_dummy_netdev - init a dummy network device for NAPI
|
|
* @dev: device to init
|
|
*
|
|
* This takes a network device structure and initialize the minimum
|
|
* amount of fields so it can be used to schedule NAPI polls without
|
|
* registering a full blown interface. This is to be used by drivers
|
|
* that need to tie several hardware interfaces to a single NAPI
|
|
* poll scheduler due to HW limitations.
|
|
*/
|
|
int init_dummy_netdev(struct net_device *dev)
|
|
{
|
|
/* Clear everything. Note we don't initialize spinlocks
|
|
* are they aren't supposed to be taken by any of the
|
|
* NAPI code and this dummy netdev is supposed to be
|
|
* only ever used for NAPI polls
|
|
*/
|
|
memset(dev, 0, sizeof(struct net_device));
|
|
|
|
/* make sure we BUG if trying to hit standard
|
|
* register/unregister code path
|
|
*/
|
|
dev->reg_state = NETREG_DUMMY;
|
|
|
|
/* NAPI wants this */
|
|
INIT_LIST_HEAD(&dev->napi_list);
|
|
|
|
/* a dummy interface is started by default */
|
|
set_bit(__LINK_STATE_PRESENT, &dev->state);
|
|
set_bit(__LINK_STATE_START, &dev->state);
|
|
|
|
/* Note : We dont allocate pcpu_refcnt for dummy devices,
|
|
* because users of this 'device' dont need to change
|
|
* its refcount.
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(init_dummy_netdev);
|
|
|
|
|
|
/**
|
|
* register_netdev - register a network device
|
|
* @dev: device to register
|
|
*
|
|
* Take a completed network device structure and add it to the kernel
|
|
* interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
|
|
* chain. 0 is returned on success. A negative errno code is returned
|
|
* on a failure to set up the device, or if the name is a duplicate.
|
|
*
|
|
* This is a wrapper around register_netdevice that takes the rtnl semaphore
|
|
* and expands the device name if you passed a format string to
|
|
* alloc_netdev.
|
|
*/
|
|
int register_netdev(struct net_device *dev)
|
|
{
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = register_netdevice(dev);
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(register_netdev);
|
|
|
|
int netdev_refcnt_read(const struct net_device *dev)
|
|
{
|
|
int i, refcnt = 0;
|
|
|
|
for_each_possible_cpu(i)
|
|
refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
|
|
return refcnt;
|
|
}
|
|
EXPORT_SYMBOL(netdev_refcnt_read);
|
|
|
|
/*
|
|
* netdev_wait_allrefs - wait until all references are gone.
|
|
*
|
|
* This is called when unregistering network devices.
|
|
*
|
|
* Any protocol or device that holds a reference should register
|
|
* for netdevice notification, and cleanup and put back the
|
|
* reference if they receive an UNREGISTER event.
|
|
* We can get stuck here if buggy protocols don't correctly
|
|
* call dev_put.
|
|
*/
|
|
static void netdev_wait_allrefs(struct net_device *dev)
|
|
{
|
|
unsigned long rebroadcast_time, warning_time;
|
|
int refcnt;
|
|
|
|
linkwatch_forget_dev(dev);
|
|
|
|
rebroadcast_time = warning_time = jiffies;
|
|
refcnt = netdev_refcnt_read(dev);
|
|
|
|
while (refcnt != 0) {
|
|
if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
|
|
rtnl_lock();
|
|
|
|
/* Rebroadcast unregister notification */
|
|
call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
|
|
/* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
|
|
* should have already handle it the first time */
|
|
|
|
if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
|
|
&dev->state)) {
|
|
/* We must not have linkwatch events
|
|
* pending on unregister. If this
|
|
* happens, we simply run the queue
|
|
* unscheduled, resulting in a noop
|
|
* for this device.
|
|
*/
|
|
linkwatch_run_queue();
|
|
}
|
|
|
|
__rtnl_unlock();
|
|
|
|
rebroadcast_time = jiffies;
|
|
}
|
|
|
|
msleep(250);
|
|
|
|
refcnt = netdev_refcnt_read(dev);
|
|
|
|
if (time_after(jiffies, warning_time + 10 * HZ)) {
|
|
pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
|
|
dev->name, refcnt);
|
|
warning_time = jiffies;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* The sequence is:
|
|
*
|
|
* rtnl_lock();
|
|
* ...
|
|
* register_netdevice(x1);
|
|
* register_netdevice(x2);
|
|
* ...
|
|
* unregister_netdevice(y1);
|
|
* unregister_netdevice(y2);
|
|
* ...
|
|
* rtnl_unlock();
|
|
* free_netdev(y1);
|
|
* free_netdev(y2);
|
|
*
|
|
* We are invoked by rtnl_unlock().
|
|
* This allows us to deal with problems:
|
|
* 1) We can delete sysfs objects which invoke hotplug
|
|
* without deadlocking with linkwatch via keventd.
|
|
* 2) Since we run with the RTNL semaphore not held, we can sleep
|
|
* safely in order to wait for the netdev refcnt to drop to zero.
|
|
*
|
|
* We must not return until all unregister events added during
|
|
* the interval the lock was held have been completed.
|
|
*/
|
|
void netdev_run_todo(void)
|
|
{
|
|
struct list_head list;
|
|
|
|
/* Snapshot list, allow later requests */
|
|
list_replace_init(&net_todo_list, &list);
|
|
|
|
__rtnl_unlock();
|
|
|
|
/* Wait for rcu callbacks to finish before attempting to drain
|
|
* the device list. This usually avoids a 250ms wait.
|
|
*/
|
|
if (!list_empty(&list))
|
|
rcu_barrier();
|
|
|
|
while (!list_empty(&list)) {
|
|
struct net_device *dev
|
|
= list_first_entry(&list, struct net_device, todo_list);
|
|
list_del(&dev->todo_list);
|
|
|
|
if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
|
|
pr_err("network todo '%s' but state %d\n",
|
|
dev->name, dev->reg_state);
|
|
dump_stack();
|
|
continue;
|
|
}
|
|
|
|
dev->reg_state = NETREG_UNREGISTERED;
|
|
|
|
on_each_cpu(flush_backlog, dev, 1);
|
|
|
|
netdev_wait_allrefs(dev);
|
|
|
|
/* paranoia */
|
|
BUG_ON(netdev_refcnt_read(dev));
|
|
WARN_ON(rcu_access_pointer(dev->ip_ptr));
|
|
WARN_ON(rcu_access_pointer(dev->ip6_ptr));
|
|
WARN_ON(dev->dn_ptr);
|
|
|
|
if (dev->destructor)
|
|
dev->destructor(dev);
|
|
|
|
/* Free network device */
|
|
kobject_put(&dev->dev.kobj);
|
|
}
|
|
}
|
|
|
|
/* Convert net_device_stats to rtnl_link_stats64. They have the same
|
|
* fields in the same order, with only the type differing.
|
|
*/
|
|
void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
|
|
const struct net_device_stats *netdev_stats)
|
|
{
|
|
#if BITS_PER_LONG == 64
|
|
BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
|
|
memcpy(stats64, netdev_stats, sizeof(*stats64));
|
|
#else
|
|
size_t i, n = sizeof(*stats64) / sizeof(u64);
|
|
const unsigned long *src = (const unsigned long *)netdev_stats;
|
|
u64 *dst = (u64 *)stats64;
|
|
|
|
BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
|
|
sizeof(*stats64) / sizeof(u64));
|
|
for (i = 0; i < n; i++)
|
|
dst[i] = src[i];
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(netdev_stats_to_stats64);
|
|
|
|
/**
|
|
* dev_get_stats - get network device statistics
|
|
* @dev: device to get statistics from
|
|
* @storage: place to store stats
|
|
*
|
|
* Get network statistics from device. Return @storage.
|
|
* The device driver may provide its own method by setting
|
|
* dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
|
|
* otherwise the internal statistics structure is used.
|
|
*/
|
|
struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
|
|
struct rtnl_link_stats64 *storage)
|
|
{
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
|
|
if (ops->ndo_get_stats64) {
|
|
memset(storage, 0, sizeof(*storage));
|
|
ops->ndo_get_stats64(dev, storage);
|
|
} else if (ops->ndo_get_stats) {
|
|
netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
|
|
} else {
|
|
netdev_stats_to_stats64(storage, &dev->stats);
|
|
}
|
|
storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
|
|
return storage;
|
|
}
|
|
EXPORT_SYMBOL(dev_get_stats);
|
|
|
|
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
|
|
{
|
|
struct netdev_queue *queue = dev_ingress_queue(dev);
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
if (queue)
|
|
return queue;
|
|
queue = kzalloc(sizeof(*queue), GFP_KERNEL);
|
|
if (!queue)
|
|
return NULL;
|
|
netdev_init_one_queue(dev, queue, NULL);
|
|
queue->qdisc = &noop_qdisc;
|
|
queue->qdisc_sleeping = &noop_qdisc;
|
|
rcu_assign_pointer(dev->ingress_queue, queue);
|
|
#endif
|
|
return queue;
|
|
}
|
|
|
|
/**
|
|
* alloc_netdev_mqs - allocate network device
|
|
* @sizeof_priv: size of private data to allocate space for
|
|
* @name: device name format string
|
|
* @setup: callback to initialize device
|
|
* @txqs: the number of TX subqueues to allocate
|
|
* @rxqs: the number of RX subqueues to allocate
|
|
*
|
|
* Allocates a struct net_device with private data area for driver use
|
|
* and performs basic initialization. Also allocates subquue structs
|
|
* for each queue on the device.
|
|
*/
|
|
struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
|
|
void (*setup)(struct net_device *),
|
|
unsigned int txqs, unsigned int rxqs)
|
|
{
|
|
struct net_device *dev;
|
|
size_t alloc_size;
|
|
struct net_device *p;
|
|
|
|
BUG_ON(strlen(name) >= sizeof(dev->name));
|
|
|
|
if (txqs < 1) {
|
|
pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
|
|
return NULL;
|
|
}
|
|
|
|
#ifdef CONFIG_RPS
|
|
if (rxqs < 1) {
|
|
pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
alloc_size = sizeof(struct net_device);
|
|
if (sizeof_priv) {
|
|
/* ensure 32-byte alignment of private area */
|
|
alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
|
|
alloc_size += sizeof_priv;
|
|
}
|
|
/* ensure 32-byte alignment of whole construct */
|
|
alloc_size += NETDEV_ALIGN - 1;
|
|
|
|
p = kzalloc(alloc_size, GFP_KERNEL);
|
|
if (!p) {
|
|
pr_err("alloc_netdev: Unable to allocate device\n");
|
|
return NULL;
|
|
}
|
|
|
|
dev = PTR_ALIGN(p, NETDEV_ALIGN);
|
|
dev->padded = (char *)dev - (char *)p;
|
|
|
|
dev->pcpu_refcnt = alloc_percpu(int);
|
|
if (!dev->pcpu_refcnt)
|
|
goto free_p;
|
|
|
|
if (dev_addr_init(dev))
|
|
goto free_pcpu;
|
|
|
|
dev_mc_init(dev);
|
|
dev_uc_init(dev);
|
|
|
|
dev_net_set(dev, &init_net);
|
|
|
|
dev->gso_max_size = GSO_MAX_SIZE;
|
|
|
|
INIT_LIST_HEAD(&dev->napi_list);
|
|
INIT_LIST_HEAD(&dev->unreg_list);
|
|
INIT_LIST_HEAD(&dev->link_watch_list);
|
|
dev->priv_flags = IFF_XMIT_DST_RELEASE;
|
|
setup(dev);
|
|
|
|
dev->num_tx_queues = txqs;
|
|
dev->real_num_tx_queues = txqs;
|
|
if (netif_alloc_netdev_queues(dev))
|
|
goto free_all;
|
|
|
|
#ifdef CONFIG_RPS
|
|
dev->num_rx_queues = rxqs;
|
|
dev->real_num_rx_queues = rxqs;
|
|
if (netif_alloc_rx_queues(dev))
|
|
goto free_all;
|
|
#endif
|
|
|
|
strcpy(dev->name, name);
|
|
dev->group = INIT_NETDEV_GROUP;
|
|
return dev;
|
|
|
|
free_all:
|
|
free_netdev(dev);
|
|
return NULL;
|
|
|
|
free_pcpu:
|
|
free_percpu(dev->pcpu_refcnt);
|
|
kfree(dev->_tx);
|
|
#ifdef CONFIG_RPS
|
|
kfree(dev->_rx);
|
|
#endif
|
|
|
|
free_p:
|
|
kfree(p);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(alloc_netdev_mqs);
|
|
|
|
/**
|
|
* free_netdev - free network device
|
|
* @dev: device
|
|
*
|
|
* This function does the last stage of destroying an allocated device
|
|
* interface. The reference to the device object is released.
|
|
* If this is the last reference then it will be freed.
|
|
*/
|
|
void free_netdev(struct net_device *dev)
|
|
{
|
|
struct napi_struct *p, *n;
|
|
|
|
release_net(dev_net(dev));
|
|
|
|
kfree(dev->_tx);
|
|
#ifdef CONFIG_RPS
|
|
kfree(dev->_rx);
|
|
#endif
|
|
|
|
kfree(rcu_dereference_protected(dev->ingress_queue, 1));
|
|
|
|
/* Flush device addresses */
|
|
dev_addr_flush(dev);
|
|
|
|
list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
|
|
netif_napi_del(p);
|
|
|
|
free_percpu(dev->pcpu_refcnt);
|
|
dev->pcpu_refcnt = NULL;
|
|
|
|
/* Compatibility with error handling in drivers */
|
|
if (dev->reg_state == NETREG_UNINITIALIZED) {
|
|
kfree((char *)dev - dev->padded);
|
|
return;
|
|
}
|
|
|
|
BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
|
|
dev->reg_state = NETREG_RELEASED;
|
|
|
|
/* will free via device release */
|
|
put_device(&dev->dev);
|
|
}
|
|
EXPORT_SYMBOL(free_netdev);
|
|
|
|
/**
|
|
* synchronize_net - Synchronize with packet receive processing
|
|
*
|
|
* Wait for packets currently being received to be done.
|
|
* Does not block later packets from starting.
|
|
*/
|
|
void synchronize_net(void)
|
|
{
|
|
might_sleep();
|
|
if (rtnl_is_locked())
|
|
synchronize_rcu_expedited();
|
|
else
|
|
synchronize_rcu();
|
|
}
|
|
EXPORT_SYMBOL(synchronize_net);
|
|
|
|
/**
|
|
* unregister_netdevice_queue - remove device from the kernel
|
|
* @dev: device
|
|
* @head: list
|
|
*
|
|
* This function shuts down a device interface and removes it
|
|
* from the kernel tables.
|
|
* If head not NULL, device is queued to be unregistered later.
|
|
*
|
|
* Callers must hold the rtnl semaphore. You may want
|
|
* unregister_netdev() instead of this.
|
|
*/
|
|
|
|
void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
|
|
{
|
|
ASSERT_RTNL();
|
|
|
|
if (head) {
|
|
list_move_tail(&dev->unreg_list, head);
|
|
} else {
|
|
rollback_registered(dev);
|
|
/* Finish processing unregister after unlock */
|
|
net_set_todo(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(unregister_netdevice_queue);
|
|
|
|
/**
|
|
* unregister_netdevice_many - unregister many devices
|
|
* @head: list of devices
|
|
*/
|
|
void unregister_netdevice_many(struct list_head *head)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
if (!list_empty(head)) {
|
|
rollback_registered_many(head);
|
|
list_for_each_entry(dev, head, unreg_list)
|
|
net_set_todo(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(unregister_netdevice_many);
|
|
|
|
/**
|
|
* unregister_netdev - remove device from the kernel
|
|
* @dev: device
|
|
*
|
|
* This function shuts down a device interface and removes it
|
|
* from the kernel tables.
|
|
*
|
|
* This is just a wrapper for unregister_netdevice that takes
|
|
* the rtnl semaphore. In general you want to use this and not
|
|
* unregister_netdevice.
|
|
*/
|
|
void unregister_netdev(struct net_device *dev)
|
|
{
|
|
rtnl_lock();
|
|
unregister_netdevice(dev);
|
|
rtnl_unlock();
|
|
}
|
|
EXPORT_SYMBOL(unregister_netdev);
|
|
|
|
/**
|
|
* dev_change_net_namespace - move device to different nethost namespace
|
|
* @dev: device
|
|
* @net: network namespace
|
|
* @pat: If not NULL name pattern to try if the current device name
|
|
* is already taken in the destination network namespace.
|
|
*
|
|
* This function shuts down a device interface and moves it
|
|
* to a new network namespace. On success 0 is returned, on
|
|
* a failure a netagive errno code is returned.
|
|
*
|
|
* Callers must hold the rtnl semaphore.
|
|
*/
|
|
|
|
int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
|
|
{
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/* Don't allow namespace local devices to be moved. */
|
|
err = -EINVAL;
|
|
if (dev->features & NETIF_F_NETNS_LOCAL)
|
|
goto out;
|
|
|
|
/* Ensure the device has been registrered */
|
|
err = -EINVAL;
|
|
if (dev->reg_state != NETREG_REGISTERED)
|
|
goto out;
|
|
|
|
/* Get out if there is nothing todo */
|
|
err = 0;
|
|
if (net_eq(dev_net(dev), net))
|
|
goto out;
|
|
|
|
/* Pick the destination device name, and ensure
|
|
* we can use it in the destination network namespace.
|
|
*/
|
|
err = -EEXIST;
|
|
if (__dev_get_by_name(net, dev->name)) {
|
|
/* We get here if we can't use the current device name */
|
|
if (!pat)
|
|
goto out;
|
|
if (dev_get_valid_name(dev, pat) < 0)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* And now a mini version of register_netdevice unregister_netdevice.
|
|
*/
|
|
|
|
/* If device is running close it first. */
|
|
dev_close(dev);
|
|
|
|
/* And unlink it from device chain */
|
|
err = -ENODEV;
|
|
unlist_netdevice(dev);
|
|
|
|
synchronize_net();
|
|
|
|
/* Shutdown queueing discipline. */
|
|
dev_shutdown(dev);
|
|
|
|
/* Notify protocols, that we are about to destroy
|
|
this device. They should clean all the things.
|
|
|
|
Note that dev->reg_state stays at NETREG_REGISTERED.
|
|
This is wanted because this way 8021q and macvlan know
|
|
the device is just moving and can keep their slaves up.
|
|
*/
|
|
call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
|
|
call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
|
|
rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
|
|
|
|
/*
|
|
* Flush the unicast and multicast chains
|
|
*/
|
|
dev_uc_flush(dev);
|
|
dev_mc_flush(dev);
|
|
|
|
/* Actually switch the network namespace */
|
|
dev_net_set(dev, net);
|
|
|
|
/* If there is an ifindex conflict assign a new one */
|
|
if (__dev_get_by_index(net, dev->ifindex)) {
|
|
int iflink = (dev->iflink == dev->ifindex);
|
|
dev->ifindex = dev_new_index(net);
|
|
if (iflink)
|
|
dev->iflink = dev->ifindex;
|
|
}
|
|
|
|
/* Fixup kobjects */
|
|
err = device_rename(&dev->dev, dev->name);
|
|
WARN_ON(err);
|
|
|
|
/* Add the device back in the hashes */
|
|
list_netdevice(dev);
|
|
|
|
/* Notify protocols, that a new device appeared. */
|
|
call_netdevice_notifiers(NETDEV_REGISTER, dev);
|
|
|
|
/*
|
|
* Prevent userspace races by waiting until the network
|
|
* device is fully setup before sending notifications.
|
|
*/
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
|
|
|
|
synchronize_net();
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_change_net_namespace);
|
|
|
|
static int dev_cpu_callback(struct notifier_block *nfb,
|
|
unsigned long action,
|
|
void *ocpu)
|
|
{
|
|
struct sk_buff **list_skb;
|
|
struct sk_buff *skb;
|
|
unsigned int cpu, oldcpu = (unsigned long)ocpu;
|
|
struct softnet_data *sd, *oldsd;
|
|
|
|
if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
|
|
return NOTIFY_OK;
|
|
|
|
local_irq_disable();
|
|
cpu = smp_processor_id();
|
|
sd = &per_cpu(softnet_data, cpu);
|
|
oldsd = &per_cpu(softnet_data, oldcpu);
|
|
|
|
/* Find end of our completion_queue. */
|
|
list_skb = &sd->completion_queue;
|
|
while (*list_skb)
|
|
list_skb = &(*list_skb)->next;
|
|
/* Append completion queue from offline CPU. */
|
|
*list_skb = oldsd->completion_queue;
|
|
oldsd->completion_queue = NULL;
|
|
|
|
/* Append output queue from offline CPU. */
|
|
if (oldsd->output_queue) {
|
|
*sd->output_queue_tailp = oldsd->output_queue;
|
|
sd->output_queue_tailp = oldsd->output_queue_tailp;
|
|
oldsd->output_queue = NULL;
|
|
oldsd->output_queue_tailp = &oldsd->output_queue;
|
|
}
|
|
/* Append NAPI poll list from offline CPU. */
|
|
if (!list_empty(&oldsd->poll_list)) {
|
|
list_splice_init(&oldsd->poll_list, &sd->poll_list);
|
|
raise_softirq_irqoff(NET_RX_SOFTIRQ);
|
|
}
|
|
|
|
raise_softirq_irqoff(NET_TX_SOFTIRQ);
|
|
local_irq_enable();
|
|
|
|
/* Process offline CPU's input_pkt_queue */
|
|
while ((skb = __skb_dequeue(&oldsd->process_queue))) {
|
|
netif_rx(skb);
|
|
input_queue_head_incr(oldsd);
|
|
}
|
|
while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
|
|
netif_rx(skb);
|
|
input_queue_head_incr(oldsd);
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
|
|
/**
|
|
* netdev_increment_features - increment feature set by one
|
|
* @all: current feature set
|
|
* @one: new feature set
|
|
* @mask: mask feature set
|
|
*
|
|
* Computes a new feature set after adding a device with feature set
|
|
* @one to the master device with current feature set @all. Will not
|
|
* enable anything that is off in @mask. Returns the new feature set.
|
|
*/
|
|
netdev_features_t netdev_increment_features(netdev_features_t all,
|
|
netdev_features_t one, netdev_features_t mask)
|
|
{
|
|
if (mask & NETIF_F_GEN_CSUM)
|
|
mask |= NETIF_F_ALL_CSUM;
|
|
mask |= NETIF_F_VLAN_CHALLENGED;
|
|
|
|
all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
|
|
all &= one | ~NETIF_F_ALL_FOR_ALL;
|
|
|
|
/* If one device supports hw checksumming, set for all. */
|
|
if (all & NETIF_F_GEN_CSUM)
|
|
all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
|
|
|
|
return all;
|
|
}
|
|
EXPORT_SYMBOL(netdev_increment_features);
|
|
|
|
static struct hlist_head *netdev_create_hash(void)
|
|
{
|
|
int i;
|
|
struct hlist_head *hash;
|
|
|
|
hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
|
|
if (hash != NULL)
|
|
for (i = 0; i < NETDEV_HASHENTRIES; i++)
|
|
INIT_HLIST_HEAD(&hash[i]);
|
|
|
|
return hash;
|
|
}
|
|
|
|
/* Initialize per network namespace state */
|
|
static int __net_init netdev_init(struct net *net)
|
|
{
|
|
INIT_LIST_HEAD(&net->dev_base_head);
|
|
|
|
net->dev_name_head = netdev_create_hash();
|
|
if (net->dev_name_head == NULL)
|
|
goto err_name;
|
|
|
|
net->dev_index_head = netdev_create_hash();
|
|
if (net->dev_index_head == NULL)
|
|
goto err_idx;
|
|
|
|
return 0;
|
|
|
|
err_idx:
|
|
kfree(net->dev_name_head);
|
|
err_name:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* netdev_drivername - network driver for the device
|
|
* @dev: network device
|
|
*
|
|
* Determine network driver for device.
|
|
*/
|
|
const char *netdev_drivername(const struct net_device *dev)
|
|
{
|
|
const struct device_driver *driver;
|
|
const struct device *parent;
|
|
const char *empty = "";
|
|
|
|
parent = dev->dev.parent;
|
|
if (!parent)
|
|
return empty;
|
|
|
|
driver = parent->driver;
|
|
if (driver && driver->name)
|
|
return driver->name;
|
|
return empty;
|
|
}
|
|
|
|
int __netdev_printk(const char *level, const struct net_device *dev,
|
|
struct va_format *vaf)
|
|
{
|
|
int r;
|
|
|
|
if (dev && dev->dev.parent)
|
|
r = dev_printk(level, dev->dev.parent, "%s: %pV",
|
|
netdev_name(dev), vaf);
|
|
else if (dev)
|
|
r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
|
|
else
|
|
r = printk("%s(NULL net_device): %pV", level, vaf);
|
|
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL(__netdev_printk);
|
|
|
|
int netdev_printk(const char *level, const struct net_device *dev,
|
|
const char *format, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
int r;
|
|
|
|
va_start(args, format);
|
|
|
|
vaf.fmt = format;
|
|
vaf.va = &args;
|
|
|
|
r = __netdev_printk(level, dev, &vaf);
|
|
va_end(args);
|
|
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL(netdev_printk);
|
|
|
|
#define define_netdev_printk_level(func, level) \
|
|
int func(const struct net_device *dev, const char *fmt, ...) \
|
|
{ \
|
|
int r; \
|
|
struct va_format vaf; \
|
|
va_list args; \
|
|
\
|
|
va_start(args, fmt); \
|
|
\
|
|
vaf.fmt = fmt; \
|
|
vaf.va = &args; \
|
|
\
|
|
r = __netdev_printk(level, dev, &vaf); \
|
|
va_end(args); \
|
|
\
|
|
return r; \
|
|
} \
|
|
EXPORT_SYMBOL(func);
|
|
|
|
define_netdev_printk_level(netdev_emerg, KERN_EMERG);
|
|
define_netdev_printk_level(netdev_alert, KERN_ALERT);
|
|
define_netdev_printk_level(netdev_crit, KERN_CRIT);
|
|
define_netdev_printk_level(netdev_err, KERN_ERR);
|
|
define_netdev_printk_level(netdev_warn, KERN_WARNING);
|
|
define_netdev_printk_level(netdev_notice, KERN_NOTICE);
|
|
define_netdev_printk_level(netdev_info, KERN_INFO);
|
|
|
|
static void __net_exit netdev_exit(struct net *net)
|
|
{
|
|
kfree(net->dev_name_head);
|
|
kfree(net->dev_index_head);
|
|
}
|
|
|
|
static struct pernet_operations __net_initdata netdev_net_ops = {
|
|
.init = netdev_init,
|
|
.exit = netdev_exit,
|
|
};
|
|
|
|
static void __net_exit default_device_exit(struct net *net)
|
|
{
|
|
struct net_device *dev, *aux;
|
|
/*
|
|
* Push all migratable network devices back to the
|
|
* initial network namespace
|
|
*/
|
|
rtnl_lock();
|
|
for_each_netdev_safe(net, dev, aux) {
|
|
int err;
|
|
char fb_name[IFNAMSIZ];
|
|
|
|
/* Ignore unmoveable devices (i.e. loopback) */
|
|
if (dev->features & NETIF_F_NETNS_LOCAL)
|
|
continue;
|
|
|
|
/* Leave virtual devices for the generic cleanup */
|
|
if (dev->rtnl_link_ops)
|
|
continue;
|
|
|
|
/* Push remaining network devices to init_net */
|
|
snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
|
|
err = dev_change_net_namespace(dev, &init_net, fb_name);
|
|
if (err) {
|
|
pr_emerg("%s: failed to move %s to init_net: %d\n",
|
|
__func__, dev->name, err);
|
|
BUG();
|
|
}
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static void __net_exit default_device_exit_batch(struct list_head *net_list)
|
|
{
|
|
/* At exit all network devices most be removed from a network
|
|
* namespace. Do this in the reverse order of registration.
|
|
* Do this across as many network namespaces as possible to
|
|
* improve batching efficiency.
|
|
*/
|
|
struct net_device *dev;
|
|
struct net *net;
|
|
LIST_HEAD(dev_kill_list);
|
|
|
|
rtnl_lock();
|
|
list_for_each_entry(net, net_list, exit_list) {
|
|
for_each_netdev_reverse(net, dev) {
|
|
if (dev->rtnl_link_ops)
|
|
dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
|
|
else
|
|
unregister_netdevice_queue(dev, &dev_kill_list);
|
|
}
|
|
}
|
|
unregister_netdevice_many(&dev_kill_list);
|
|
list_del(&dev_kill_list);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static struct pernet_operations __net_initdata default_device_ops = {
|
|
.exit = default_device_exit,
|
|
.exit_batch = default_device_exit_batch,
|
|
};
|
|
|
|
/*
|
|
* Initialize the DEV module. At boot time this walks the device list and
|
|
* unhooks any devices that fail to initialise (normally hardware not
|
|
* present) and leaves us with a valid list of present and active devices.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* This is called single threaded during boot, so no need
|
|
* to take the rtnl semaphore.
|
|
*/
|
|
static int __init net_dev_init(void)
|
|
{
|
|
int i, rc = -ENOMEM;
|
|
|
|
BUG_ON(!dev_boot_phase);
|
|
|
|
if (dev_proc_init())
|
|
goto out;
|
|
|
|
if (netdev_kobject_init())
|
|
goto out;
|
|
|
|
INIT_LIST_HEAD(&ptype_all);
|
|
for (i = 0; i < PTYPE_HASH_SIZE; i++)
|
|
INIT_LIST_HEAD(&ptype_base[i]);
|
|
|
|
if (register_pernet_subsys(&netdev_net_ops))
|
|
goto out;
|
|
|
|
/*
|
|
* Initialise the packet receive queues.
|
|
*/
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct softnet_data *sd = &per_cpu(softnet_data, i);
|
|
|
|
memset(sd, 0, sizeof(*sd));
|
|
skb_queue_head_init(&sd->input_pkt_queue);
|
|
skb_queue_head_init(&sd->process_queue);
|
|
sd->completion_queue = NULL;
|
|
INIT_LIST_HEAD(&sd->poll_list);
|
|
sd->output_queue = NULL;
|
|
sd->output_queue_tailp = &sd->output_queue;
|
|
#ifdef CONFIG_RPS
|
|
sd->csd.func = rps_trigger_softirq;
|
|
sd->csd.info = sd;
|
|
sd->csd.flags = 0;
|
|
sd->cpu = i;
|
|
#endif
|
|
|
|
sd->backlog.poll = process_backlog;
|
|
sd->backlog.weight = weight_p;
|
|
sd->backlog.gro_list = NULL;
|
|
sd->backlog.gro_count = 0;
|
|
}
|
|
|
|
dev_boot_phase = 0;
|
|
|
|
/* The loopback device is special if any other network devices
|
|
* is present in a network namespace the loopback device must
|
|
* be present. Since we now dynamically allocate and free the
|
|
* loopback device ensure this invariant is maintained by
|
|
* keeping the loopback device as the first device on the
|
|
* list of network devices. Ensuring the loopback devices
|
|
* is the first device that appears and the last network device
|
|
* that disappears.
|
|
*/
|
|
if (register_pernet_device(&loopback_net_ops))
|
|
goto out;
|
|
|
|
if (register_pernet_device(&default_device_ops))
|
|
goto out;
|
|
|
|
open_softirq(NET_TX_SOFTIRQ, net_tx_action);
|
|
open_softirq(NET_RX_SOFTIRQ, net_rx_action);
|
|
|
|
hotcpu_notifier(dev_cpu_callback, 0);
|
|
dst_init();
|
|
dev_mcast_init();
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
subsys_initcall(net_dev_init);
|
|
|
|
static int __init initialize_hashrnd(void)
|
|
{
|
|
get_random_bytes(&hashrnd, sizeof(hashrnd));
|
|
return 0;
|
|
}
|
|
|
|
late_initcall_sync(initialize_hashrnd);
|
|
|