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3277 lines
79 KiB
3277 lines
79 KiB
/*
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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 <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/config.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/sched.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/notifier.h>
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#include <linux/skbuff.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 <linux/if_bridge.h>
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#include <linux/divert.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 <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/kallsyms.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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#ifdef CONFIG_NET_RADIO
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#include <linux/wireless.h> /* Note : will define WIRELESS_EXT */
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#include <net/iw_handler.h>
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#endif /* CONFIG_NET_RADIO */
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#include <asm/current.h>
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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 adversly 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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static DEFINE_SPINLOCK(ptype_lock);
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static struct list_head ptype_base[16]; /* 16 way hashed list */
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static struct list_head ptype_all; /* Taps */
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/*
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* The @dev_base list is protected by @dev_base_lock and the rtln
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* semaphore.
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*
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* Pure readers hold dev_base_lock for reading.
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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 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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struct net_device *dev_base;
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static struct net_device **dev_tail = &dev_base;
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DEFINE_RWLOCK(dev_base_lock);
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EXPORT_SYMBOL(dev_base);
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EXPORT_SYMBOL(dev_base_lock);
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#define NETDEV_HASHBITS 8
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static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS];
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static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS];
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static inline struct hlist_head *dev_name_hash(const char *name)
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{
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unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
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return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)];
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}
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static inline struct hlist_head *dev_index_hash(int ifindex)
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{
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return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)];
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}
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/*
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* Our notifier list
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*/
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static struct notifier_block *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(struct softnet_data, softnet_data) = { NULL };
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#ifdef CONFIG_SYSFS
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extern int netdev_sysfs_init(void);
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extern int netdev_register_sysfs(struct net_device *);
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extern void netdev_unregister_sysfs(struct net_device *);
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#else
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#define netdev_sysfs_init() (0)
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#define netdev_register_sysfs(dev) (0)
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#define netdev_unregister_sysfs(dev) do { } while(0)
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#endif
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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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* For efficiency
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*/
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int netdev_nit;
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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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/**
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* dev_add_pack - add packet handler
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* @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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*/
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void dev_add_pack(struct packet_type *pt)
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{
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int hash;
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spin_lock_bh(&ptype_lock);
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if (pt->type == htons(ETH_P_ALL)) {
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netdev_nit++;
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list_add_rcu(&pt->list, &ptype_all);
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} else {
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hash = ntohs(pt->type) & 15;
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list_add_rcu(&pt->list, &ptype_base[hash]);
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}
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spin_unlock_bh(&ptype_lock);
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}
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extern void linkwatch_run_queue(void);
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/**
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* __dev_remove_pack - remove packet handler
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* @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;
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struct packet_type *pt1;
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spin_lock_bh(&ptype_lock);
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if (pt->type == htons(ETH_P_ALL)) {
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netdev_nit--;
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head = &ptype_all;
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} else
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head = &ptype_base[ntohs(pt->type) & 15];
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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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printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
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out:
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spin_unlock_bh(&ptype_lock);
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}
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/**
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* dev_remove_pack - remove packet handler
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* @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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* This call sleeps to guarantee that no CPU is looking at the packet
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* type after return.
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*/
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void dev_remove_pack(struct packet_type *pt)
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{
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__dev_remove_pack(pt);
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synchronize_net();
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}
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/******************************************************************************
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Device Boot-time Settings Routines
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*******************************************************************************/
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/* Boot time configuration table */
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static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
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/**
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* netdev_boot_setup_add - add new setup entry
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* @name: name of the device
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* @map: configured settings for the device
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*
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* Adds new setup entry to the dev_boot_setup list. The function
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* returns 0 on error and 1 on success. This is a generic routine to
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* all netdevices.
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*/
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static int netdev_boot_setup_add(char *name, struct ifmap *map)
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{
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struct netdev_boot_setup *s;
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int i;
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s = dev_boot_setup;
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for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
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if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
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memset(s[i].name, 0, sizeof(s[i].name));
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strcpy(s[i].name, name);
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memcpy(&s[i].map, map, sizeof(s[i].map));
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break;
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}
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}
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return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
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}
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/**
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* netdev_boot_setup_check - check boot time settings
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* @dev: the netdevice
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*
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* Check boot time settings for the device.
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* The found settings are set for the device to be used
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* later in the device probing.
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* Returns 0 if no settings found, 1 if they are.
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*/
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int netdev_boot_setup_check(struct net_device *dev)
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{
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struct netdev_boot_setup *s = dev_boot_setup;
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int i;
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for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
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if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
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!strncmp(dev->name, s[i].name, strlen(s[i].name))) {
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dev->irq = s[i].map.irq;
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dev->base_addr = s[i].map.base_addr;
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dev->mem_start = s[i].map.mem_start;
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dev->mem_end = s[i].map.mem_end;
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return 1;
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}
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}
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return 0;
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}
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|
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/**
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* netdev_boot_base - get address from boot time settings
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* @prefix: prefix for network device
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* @unit: id for network device
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*
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* Check boot time settings for the base address of device.
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* The found settings are set for the device to be used
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* later in the device probing.
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* Returns 0 if no settings found.
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*/
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unsigned long netdev_boot_base(const char *prefix, int unit)
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{
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const struct netdev_boot_setup *s = dev_boot_setup;
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char name[IFNAMSIZ];
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int i;
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sprintf(name, "%s%d", prefix, unit);
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/*
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* If device already registered then return base of 1
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|
* to indicate not to probe for this interface
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|
*/
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if (__dev_get_by_name(name))
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return 1;
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for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
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if (!strcmp(name, s[i].name))
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return s[i].map.base_addr;
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return 0;
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}
|
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|
|
/*
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|
* Saves at boot time configured settings for any netdevice.
|
|
*/
|
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int __init netdev_boot_setup(char *str)
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{
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int ints[5];
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struct ifmap map;
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|
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str = get_options(str, ARRAY_SIZE(ints), ints);
|
|
if (!str || !*str)
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return 0;
|
|
|
|
/* Save settings */
|
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memset(&map, 0, sizeof(map));
|
|
if (ints[0] > 0)
|
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map.irq = ints[1];
|
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if (ints[0] > 1)
|
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map.base_addr = ints[2];
|
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if (ints[0] > 2)
|
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map.mem_start = ints[3];
|
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if (ints[0] > 3)
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map.mem_end = ints[4];
|
|
|
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/* Add new entry to the list */
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return netdev_boot_setup_add(str, &map);
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}
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|
|
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__setup("netdev=", netdev_boot_setup);
|
|
|
|
/*******************************************************************************
|
|
|
|
Device Interface Subroutines
|
|
|
|
*******************************************************************************/
|
|
|
|
/**
|
|
* __dev_get_by_name - find a device by its name
|
|
* @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(const char *name)
|
|
{
|
|
struct hlist_node *p;
|
|
|
|
hlist_for_each(p, dev_name_hash(name)) {
|
|
struct net_device *dev
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= hlist_entry(p, struct net_device, name_hlist);
|
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if (!strncmp(dev->name, name, IFNAMSIZ))
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return dev;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* dev_get_by_name - find a device by its name
|
|
* @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(const char *name)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
read_lock(&dev_base_lock);
|
|
dev = __dev_get_by_name(name);
|
|
if (dev)
|
|
dev_hold(dev);
|
|
read_unlock(&dev_base_lock);
|
|
return dev;
|
|
}
|
|
|
|
/**
|
|
* __dev_get_by_index - find a device by its ifindex
|
|
* @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(int ifindex)
|
|
{
|
|
struct hlist_node *p;
|
|
|
|
hlist_for_each(p, dev_index_hash(ifindex)) {
|
|
struct net_device *dev
|
|
= hlist_entry(p, struct net_device, index_hlist);
|
|
if (dev->ifindex == ifindex)
|
|
return dev;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/**
|
|
* dev_get_by_index - find a device by its ifindex
|
|
* @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(int ifindex)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
read_lock(&dev_base_lock);
|
|
dev = __dev_get_by_index(ifindex);
|
|
if (dev)
|
|
dev_hold(dev);
|
|
read_unlock(&dev_base_lock);
|
|
return dev;
|
|
}
|
|
|
|
/**
|
|
* dev_getbyhwaddr - find a device by its hardware address
|
|
* @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 the
|
|
* rtnl semaphore. The returned device has not had its ref count increased
|
|
* and the caller must therefore be careful about locking
|
|
*
|
|
* BUGS:
|
|
* If the API was consistent this would be __dev_get_by_hwaddr
|
|
*/
|
|
|
|
struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for (dev = dev_base; dev; dev = dev->next)
|
|
if (dev->type == type &&
|
|
!memcmp(dev->dev_addr, ha, dev->addr_len))
|
|
break;
|
|
return dev;
|
|
}
|
|
|
|
struct net_device *dev_getfirstbyhwtype(unsigned short type)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
rtnl_lock();
|
|
for (dev = dev_base; dev; dev = dev->next) {
|
|
if (dev->type == type) {
|
|
dev_hold(dev);
|
|
break;
|
|
}
|
|
}
|
|
rtnl_unlock();
|
|
return dev;
|
|
}
|
|
|
|
EXPORT_SYMBOL(dev_getfirstbyhwtype);
|
|
|
|
/**
|
|
* dev_get_by_flags - find any device with given flags
|
|
* @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. 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_flags(unsigned short if_flags, unsigned short mask)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
read_lock(&dev_base_lock);
|
|
for (dev = dev_base; dev != NULL; dev = dev->next) {
|
|
if (((dev->flags ^ if_flags) & mask) == 0) {
|
|
dev_hold(dev);
|
|
break;
|
|
}
|
|
}
|
|
read_unlock(&dev_base_lock);
|
|
return dev;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
static int dev_valid_name(const char *name)
|
|
{
|
|
return !(*name == '\0'
|
|
|| !strcmp(name, ".")
|
|
|| !strcmp(name, "..")
|
|
|| strchr(name, '/'));
|
|
}
|
|
|
|
/**
|
|
* 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. Not efficient for many devices, not called a lot. The caller
|
|
* must hold the dev_base or rtnl lock while allocating the name and
|
|
* adding the device in order to avoid duplicates. Returns the number
|
|
* of the unit assigned or a negative errno code.
|
|
*/
|
|
|
|
int dev_alloc_name(struct net_device *dev, const char *name)
|
|
{
|
|
int i = 0;
|
|
char buf[IFNAMSIZ];
|
|
const char *p;
|
|
const int max_netdevices = 8*PAGE_SIZE;
|
|
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 = (long *) get_zeroed_page(GFP_ATOMIC);
|
|
if (!inuse)
|
|
return -ENOMEM;
|
|
|
|
for (d = dev_base; d; d = d->next) {
|
|
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, sizeof(buf), 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);
|
|
}
|
|
|
|
snprintf(buf, sizeof(buf), name, i);
|
|
if (!__dev_get_by_name(buf)) {
|
|
strlcpy(dev->name, buf, IFNAMSIZ);
|
|
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_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, char *newname)
|
|
{
|
|
int err = 0;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (dev->flags & IFF_UP)
|
|
return -EBUSY;
|
|
|
|
if (!dev_valid_name(newname))
|
|
return -EINVAL;
|
|
|
|
if (strchr(newname, '%')) {
|
|
err = dev_alloc_name(dev, newname);
|
|
if (err < 0)
|
|
return err;
|
|
strcpy(newname, dev->name);
|
|
}
|
|
else if (__dev_get_by_name(newname))
|
|
return -EEXIST;
|
|
else
|
|
strlcpy(dev->name, newname, IFNAMSIZ);
|
|
|
|
err = class_device_rename(&dev->class_dev, dev->name);
|
|
if (!err) {
|
|
hlist_del(&dev->name_hlist);
|
|
hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
|
|
notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* netdev_features_change - device changes fatures
|
|
* @dev: device to cause notification
|
|
*
|
|
* Called to indicate a device has changed features.
|
|
*/
|
|
void netdev_features_change(struct net_device *dev)
|
|
{
|
|
notifier_call_chain(&netdev_chain, 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) {
|
|
notifier_call_chain(&netdev_chain, NETDEV_CHANGE, dev);
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* dev_load - load a network module
|
|
* @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(const char *name)
|
|
{
|
|
struct net_device *dev;
|
|
|
|
read_lock(&dev_base_lock);
|
|
dev = __dev_get_by_name(name);
|
|
read_unlock(&dev_base_lock);
|
|
|
|
if (!dev && capable(CAP_SYS_MODULE))
|
|
request_module("%s", name);
|
|
}
|
|
|
|
static int default_rebuild_header(struct sk_buff *skb)
|
|
{
|
|
printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
|
|
skb->dev ? skb->dev->name : "NULL!!!");
|
|
kfree_skb(skb);
|
|
return 1;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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 = 0;
|
|
|
|
/*
|
|
* Is it already up?
|
|
*/
|
|
|
|
if (dev->flags & IFF_UP)
|
|
return 0;
|
|
|
|
/*
|
|
* Is it even present?
|
|
*/
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* Call device private open method
|
|
*/
|
|
set_bit(__LINK_STATE_START, &dev->state);
|
|
if (dev->open) {
|
|
ret = dev->open(dev);
|
|
if (ret)
|
|
clear_bit(__LINK_STATE_START, &dev->state);
|
|
}
|
|
|
|
/*
|
|
* If it went open OK then:
|
|
*/
|
|
|
|
if (!ret) {
|
|
/*
|
|
* Set the flags.
|
|
*/
|
|
dev->flags |= IFF_UP;
|
|
|
|
/*
|
|
* Initialize multicasting status
|
|
*/
|
|
dev_mc_upload(dev);
|
|
|
|
/*
|
|
* Wakeup transmit queue engine
|
|
*/
|
|
dev_activate(dev);
|
|
|
|
/*
|
|
* ... and announce new interface.
|
|
*/
|
|
notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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))
|
|
return 0;
|
|
|
|
/*
|
|
* Tell people we are going down, so that they can
|
|
* prepare to death, when device is still operating.
|
|
*/
|
|
notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
|
|
|
|
dev_deactivate(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(),
|
|
* and wait when poll really will happen. Actually, the best place
|
|
* for this is inside dev->stop() after device stopped its irq
|
|
* engine, but this requires more changes in devices. */
|
|
|
|
smp_mb__after_clear_bit(); /* Commit netif_running(). */
|
|
while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
|
|
/* No hurry. */
|
|
current->state = TASK_INTERRUPTIBLE;
|
|
schedule_timeout(1);
|
|
}
|
|
|
|
/*
|
|
* 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 (dev->stop)
|
|
dev->stop(dev);
|
|
|
|
/*
|
|
* Device is now down.
|
|
*/
|
|
|
|
dev->flags &= ~IFF_UP;
|
|
|
|
/*
|
|
* Tell people we are down
|
|
*/
|
|
notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Device change register/unregister. These are not inline or static
|
|
* as we export them to the world.
|
|
*/
|
|
|
|
/**
|
|
* 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;
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = notifier_chain_register(&netdev_chain, nb);
|
|
if (!err) {
|
|
for (dev = dev_base; dev; dev = dev->next) {
|
|
nb->notifier_call(nb, NETDEV_REGISTER, dev);
|
|
|
|
if (dev->flags & IFF_UP)
|
|
nb->notifier_call(nb, NETDEV_UP, dev);
|
|
}
|
|
}
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
|
|
int unregister_netdevice_notifier(struct notifier_block *nb)
|
|
{
|
|
return notifier_chain_unregister(&netdev_chain, nb);
|
|
}
|
|
|
|
/**
|
|
* call_netdevice_notifiers - call all network notifier blocks
|
|
* @val: value passed unmodified to notifier function
|
|
* @v: pointer passed unmodified to notifier function
|
|
*
|
|
* Call all network notifier blocks. Parameters and return value
|
|
* are as for notifier_call_chain().
|
|
*/
|
|
|
|
int call_netdevice_notifiers(unsigned long val, void *v)
|
|
{
|
|
return notifier_call_chain(&netdev_chain, val, v);
|
|
}
|
|
|
|
/* When > 0 there are consumers of rx skb time stamps */
|
|
static atomic_t netstamp_needed = ATOMIC_INIT(0);
|
|
|
|
void net_enable_timestamp(void)
|
|
{
|
|
atomic_inc(&netstamp_needed);
|
|
}
|
|
|
|
void net_disable_timestamp(void)
|
|
{
|
|
atomic_dec(&netstamp_needed);
|
|
}
|
|
|
|
static inline void net_timestamp(struct timeval *stamp)
|
|
{
|
|
if (atomic_read(&netstamp_needed))
|
|
do_gettimeofday(stamp);
|
|
else {
|
|
stamp->tv_sec = 0;
|
|
stamp->tv_usec = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Support routine. Sends outgoing frames to any network
|
|
* taps currently in use.
|
|
*/
|
|
|
|
void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct packet_type *ptype;
|
|
net_timestamp(&skb->stamp);
|
|
|
|
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)) {
|
|
struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb2)
|
|
break;
|
|
|
|
/* skb->nh should be correctly
|
|
set by sender, so that the second statement is
|
|
just protection against buggy protocols.
|
|
*/
|
|
skb2->mac.raw = skb2->data;
|
|
|
|
if (skb2->nh.raw < skb2->data ||
|
|
skb2->nh.raw > skb2->tail) {
|
|
if (net_ratelimit())
|
|
printk(KERN_CRIT "protocol %04x is "
|
|
"buggy, dev %s\n",
|
|
skb2->protocol, dev->name);
|
|
skb2->nh.raw = skb2->data;
|
|
}
|
|
|
|
skb2->h.raw = skb2->nh.raw;
|
|
skb2->pkt_type = PACKET_OUTGOING;
|
|
ptype->func(skb2, skb->dev, ptype);
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/*
|
|
* Invalidate hardware checksum when packet is to be mangled, and
|
|
* complete checksum manually on outgoing path.
|
|
*/
|
|
int skb_checksum_help(struct sk_buff *skb, int inward)
|
|
{
|
|
unsigned int csum;
|
|
int ret = 0, offset = skb->h.raw - skb->data;
|
|
|
|
if (inward) {
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
goto out;
|
|
}
|
|
|
|
if (skb_cloned(skb)) {
|
|
ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (offset > (int)skb->len)
|
|
BUG();
|
|
csum = skb_checksum(skb, offset, skb->len-offset, 0);
|
|
|
|
offset = skb->tail - skb->h.raw;
|
|
if (offset <= 0)
|
|
BUG();
|
|
if (skb->csum + 2 > offset)
|
|
BUG();
|
|
|
|
*(u16*)(skb->h.raw + skb->csum) = csum_fold(csum);
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
/* 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 inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
|
|
{
|
|
int i;
|
|
|
|
if (dev->features & NETIF_F_HIGHDMA)
|
|
return 0;
|
|
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
|
|
if (PageHighMem(skb_shinfo(skb)->frags[i].page))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define illegal_highdma(dev, skb) (0)
|
|
#endif
|
|
|
|
extern void skb_release_data(struct sk_buff *);
|
|
|
|
/* Keep head the same: replace data */
|
|
int __skb_linearize(struct sk_buff *skb, unsigned int __nocast gfp_mask)
|
|
{
|
|
unsigned int size;
|
|
u8 *data;
|
|
long offset;
|
|
struct skb_shared_info *ninfo;
|
|
int headerlen = skb->data - skb->head;
|
|
int expand = (skb->tail + skb->data_len) - skb->end;
|
|
|
|
if (skb_shared(skb))
|
|
BUG();
|
|
|
|
if (expand <= 0)
|
|
expand = 0;
|
|
|
|
size = skb->end - skb->head + expand;
|
|
size = SKB_DATA_ALIGN(size);
|
|
data = kmalloc(size + sizeof(struct skb_shared_info), gfp_mask);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
/* Copy entire thing */
|
|
if (skb_copy_bits(skb, -headerlen, data, headerlen + skb->len))
|
|
BUG();
|
|
|
|
/* Set up shinfo */
|
|
ninfo = (struct skb_shared_info*)(data + size);
|
|
atomic_set(&ninfo->dataref, 1);
|
|
ninfo->tso_size = skb_shinfo(skb)->tso_size;
|
|
ninfo->tso_segs = skb_shinfo(skb)->tso_segs;
|
|
ninfo->nr_frags = 0;
|
|
ninfo->frag_list = NULL;
|
|
|
|
/* Offset between the two in bytes */
|
|
offset = data - skb->head;
|
|
|
|
/* Free old data. */
|
|
skb_release_data(skb);
|
|
|
|
skb->head = data;
|
|
skb->end = data + size;
|
|
|
|
/* Set up new pointers */
|
|
skb->h.raw += offset;
|
|
skb->nh.raw += offset;
|
|
skb->mac.raw += offset;
|
|
skb->tail += offset;
|
|
skb->data += offset;
|
|
|
|
/* We are no longer a clone, even if we were. */
|
|
skb->cloned = 0;
|
|
|
|
skb->tail += skb->data_len;
|
|
skb->data_len = 0;
|
|
return 0;
|
|
}
|
|
|
|
#define HARD_TX_LOCK(dev, cpu) { \
|
|
if ((dev->features & NETIF_F_LLTX) == 0) { \
|
|
spin_lock(&dev->xmit_lock); \
|
|
dev->xmit_lock_owner = cpu; \
|
|
} \
|
|
}
|
|
|
|
#define HARD_TX_UNLOCK(dev) { \
|
|
if ((dev->features & NETIF_F_LLTX) == 0) { \
|
|
dev->xmit_lock_owner = -1; \
|
|
spin_unlock(&dev->xmit_lock); \
|
|
} \
|
|
}
|
|
|
|
/**
|
|
* 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 Qdisc *q;
|
|
int rc = -ENOMEM;
|
|
|
|
if (skb_shinfo(skb)->frag_list &&
|
|
!(dev->features & NETIF_F_FRAGLIST) &&
|
|
__skb_linearize(skb, GFP_ATOMIC))
|
|
goto out_kfree_skb;
|
|
|
|
/* Fragmented skb is linearized if device does not support SG,
|
|
* or if at least one of fragments is in highmem and device
|
|
* does not support DMA from it.
|
|
*/
|
|
if (skb_shinfo(skb)->nr_frags &&
|
|
(!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
|
|
__skb_linearize(skb, GFP_ATOMIC))
|
|
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_HW &&
|
|
(!(dev->features & (NETIF_F_HW_CSUM | NETIF_F_NO_CSUM)) &&
|
|
(!(dev->features & NETIF_F_IP_CSUM) ||
|
|
skb->protocol != htons(ETH_P_IP))))
|
|
if (skb_checksum_help(skb, 0))
|
|
goto out_kfree_skb;
|
|
|
|
/* Disable soft irqs for various locks below. Also
|
|
* stops preemption for RCU.
|
|
*/
|
|
local_bh_disable();
|
|
|
|
/* Updates of qdisc are serialized by queue_lock.
|
|
* The struct Qdisc which is pointed to by qdisc is now a
|
|
* rcu structure - it may be accessed without acquiring
|
|
* a lock (but the structure may be stale.) The freeing of the
|
|
* qdisc will be deferred until it's known that there are no
|
|
* more references to it.
|
|
*
|
|
* If the qdisc has an enqueue function, we still need to
|
|
* hold the queue_lock before calling it, since queue_lock
|
|
* also serializes access to the device queue.
|
|
*/
|
|
|
|
q = rcu_dereference(dev->qdisc);
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
|
|
#endif
|
|
if (q->enqueue) {
|
|
/* Grab device queue */
|
|
spin_lock(&dev->queue_lock);
|
|
|
|
rc = q->enqueue(skb, q);
|
|
|
|
qdisc_run(dev);
|
|
|
|
spin_unlock(&dev->queue_lock);
|
|
rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
|
|
goto out;
|
|
}
|
|
|
|
/* The device has no queue. Common case for software devices:
|
|
loopback, all the sorts of tunnels...
|
|
|
|
Really, it is unlikely that xmit_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 (dev->xmit_lock_owner != cpu) {
|
|
|
|
HARD_TX_LOCK(dev, cpu);
|
|
|
|
if (!netif_queue_stopped(dev)) {
|
|
if (netdev_nit)
|
|
dev_queue_xmit_nit(skb, dev);
|
|
|
|
rc = 0;
|
|
if (!dev->hard_start_xmit(skb, dev)) {
|
|
HARD_TX_UNLOCK(dev);
|
|
goto out;
|
|
}
|
|
}
|
|
HARD_TX_UNLOCK(dev);
|
|
if (net_ratelimit())
|
|
printk(KERN_CRIT "Virtual device %s asks to "
|
|
"queue packet!\n", dev->name);
|
|
} else {
|
|
/* Recursion is detected! It is possible,
|
|
* unfortunately */
|
|
if (net_ratelimit())
|
|
printk(KERN_CRIT "Dead loop on virtual device "
|
|
"%s, fix it urgently!\n", dev->name);
|
|
}
|
|
}
|
|
|
|
rc = -ENETDOWN;
|
|
local_bh_enable();
|
|
|
|
out_kfree_skb:
|
|
kfree_skb(skb);
|
|
return rc;
|
|
out:
|
|
local_bh_enable();
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*=======================================================================
|
|
Receiver routines
|
|
=======================================================================*/
|
|
|
|
int netdev_max_backlog = 1000;
|
|
int netdev_budget = 300;
|
|
int weight_p = 64; /* old backlog weight */
|
|
|
|
DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
|
|
|
|
|
|
/**
|
|
* 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_CN_LOW (low congestion)
|
|
* NET_RX_CN_MOD (moderate congestion)
|
|
* NET_RX_CN_HIGH (high congestion)
|
|
* NET_RX_DROP (packet was dropped)
|
|
*
|
|
*/
|
|
|
|
int netif_rx(struct sk_buff *skb)
|
|
{
|
|
struct softnet_data *queue;
|
|
unsigned long flags;
|
|
|
|
/* if netpoll wants it, pretend we never saw it */
|
|
if (netpoll_rx(skb))
|
|
return NET_RX_DROP;
|
|
|
|
if (!skb->stamp.tv_sec)
|
|
net_timestamp(&skb->stamp);
|
|
|
|
/*
|
|
* The code is rearranged so that the path is the most
|
|
* short when CPU is congested, but is still operating.
|
|
*/
|
|
local_irq_save(flags);
|
|
queue = &__get_cpu_var(softnet_data);
|
|
|
|
__get_cpu_var(netdev_rx_stat).total++;
|
|
if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
|
|
if (queue->input_pkt_queue.qlen) {
|
|
enqueue:
|
|
dev_hold(skb->dev);
|
|
__skb_queue_tail(&queue->input_pkt_queue, skb);
|
|
local_irq_restore(flags);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
netif_rx_schedule(&queue->backlog_dev);
|
|
goto enqueue;
|
|
}
|
|
|
|
__get_cpu_var(netdev_rx_stat).dropped++;
|
|
local_irq_restore(flags);
|
|
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
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 __inline__ void skb_bond(struct sk_buff *skb)
|
|
{
|
|
struct net_device *dev = skb->dev;
|
|
|
|
if (dev->master) {
|
|
skb->real_dev = skb->dev;
|
|
skb->dev = dev->master;
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
BUG_TRAP(!atomic_read(&skb->users));
|
|
__kfree_skb(skb);
|
|
}
|
|
}
|
|
|
|
if (sd->output_queue) {
|
|
struct net_device *head;
|
|
|
|
local_irq_disable();
|
|
head = sd->output_queue;
|
|
sd->output_queue = NULL;
|
|
local_irq_enable();
|
|
|
|
while (head) {
|
|
struct net_device *dev = head;
|
|
head = head->next_sched;
|
|
|
|
smp_mb__before_clear_bit();
|
|
clear_bit(__LINK_STATE_SCHED, &dev->state);
|
|
|
|
if (spin_trylock(&dev->queue_lock)) {
|
|
qdisc_run(dev);
|
|
spin_unlock(&dev->queue_lock);
|
|
} else {
|
|
netif_schedule(dev);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static __inline__ int deliver_skb(struct sk_buff *skb,
|
|
struct packet_type *pt_prev)
|
|
{
|
|
atomic_inc(&skb->users);
|
|
return pt_prev->func(skb, skb->dev, pt_prev);
|
|
}
|
|
|
|
#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
|
|
int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);
|
|
struct net_bridge;
|
|
struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
|
|
unsigned char *addr);
|
|
void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
|
|
|
|
static __inline__ int handle_bridge(struct sk_buff **pskb,
|
|
struct packet_type **pt_prev, int *ret)
|
|
{
|
|
struct net_bridge_port *port;
|
|
|
|
if ((*pskb)->pkt_type == PACKET_LOOPBACK ||
|
|
(port = rcu_dereference((*pskb)->dev->br_port)) == NULL)
|
|
return 0;
|
|
|
|
if (*pt_prev) {
|
|
*ret = deliver_skb(*pskb, *pt_prev);
|
|
*pt_prev = NULL;
|
|
}
|
|
|
|
return br_handle_frame_hook(port, pskb);
|
|
}
|
|
#else
|
|
#define handle_bridge(skb, pt_prev, ret) (0)
|
|
#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 doesnt stop any functionality; if you dont have
|
|
* the ingress scheduler, you just cant add policies on ingress.
|
|
*
|
|
*/
|
|
static int ing_filter(struct sk_buff *skb)
|
|
{
|
|
struct Qdisc *q;
|
|
struct net_device *dev = skb->dev;
|
|
int result = TC_ACT_OK;
|
|
|
|
if (dev->qdisc_ingress) {
|
|
__u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
|
|
if (MAX_RED_LOOP < ttl++) {
|
|
printk("Redir loop detected Dropping packet (%s->%s)\n",
|
|
skb->input_dev?skb->input_dev->name:"??",skb->dev->name);
|
|
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);
|
|
if (NULL == skb->input_dev) {
|
|
skb->input_dev = skb->dev;
|
|
printk("ing_filter: fixed %s out %s\n",skb->input_dev->name,skb->dev->name);
|
|
}
|
|
spin_lock(&dev->ingress_lock);
|
|
if ((q = dev->qdisc_ingress) != NULL)
|
|
result = q->enqueue(skb, q);
|
|
spin_unlock(&dev->ingress_lock);
|
|
|
|
}
|
|
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
int netif_receive_skb(struct sk_buff *skb)
|
|
{
|
|
struct packet_type *ptype, *pt_prev;
|
|
int ret = NET_RX_DROP;
|
|
unsigned short type;
|
|
|
|
/* if we've gotten here through NAPI, check netpoll */
|
|
if (skb->dev->poll && netpoll_rx(skb))
|
|
return NET_RX_DROP;
|
|
|
|
if (!skb->stamp.tv_sec)
|
|
net_timestamp(&skb->stamp);
|
|
|
|
skb_bond(skb);
|
|
|
|
__get_cpu_var(netdev_rx_stat).total++;
|
|
|
|
skb->h.raw = skb->nh.raw = skb->data;
|
|
skb->mac_len = skb->nh.raw - skb->mac.raw;
|
|
|
|
pt_prev = NULL;
|
|
|
|
rcu_read_lock();
|
|
|
|
#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);
|
|
pt_prev = ptype;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
if (pt_prev) {
|
|
ret = deliver_skb(skb, pt_prev);
|
|
pt_prev = NULL; /* noone else should process this after*/
|
|
} else {
|
|
skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
|
|
}
|
|
|
|
ret = ing_filter(skb);
|
|
|
|
if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
|
|
kfree_skb(skb);
|
|
goto out;
|
|
}
|
|
|
|
skb->tc_verd = 0;
|
|
ncls:
|
|
#endif
|
|
|
|
handle_diverter(skb);
|
|
|
|
if (handle_bridge(&skb, &pt_prev, &ret))
|
|
goto out;
|
|
|
|
type = skb->protocol;
|
|
list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
|
|
if (ptype->type == type &&
|
|
(!ptype->dev || ptype->dev == skb->dev)) {
|
|
if (pt_prev)
|
|
ret = deliver_skb(skb, pt_prev);
|
|
pt_prev = ptype;
|
|
}
|
|
}
|
|
|
|
if (pt_prev) {
|
|
ret = pt_prev->func(skb, skb->dev, pt_prev);
|
|
} else {
|
|
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;
|
|
}
|
|
|
|
static int process_backlog(struct net_device *backlog_dev, int *budget)
|
|
{
|
|
int work = 0;
|
|
int quota = min(backlog_dev->quota, *budget);
|
|
struct softnet_data *queue = &__get_cpu_var(softnet_data);
|
|
unsigned long start_time = jiffies;
|
|
|
|
backlog_dev->weight = weight_p;
|
|
for (;;) {
|
|
struct sk_buff *skb;
|
|
struct net_device *dev;
|
|
|
|
local_irq_disable();
|
|
skb = __skb_dequeue(&queue->input_pkt_queue);
|
|
if (!skb)
|
|
goto job_done;
|
|
local_irq_enable();
|
|
|
|
dev = skb->dev;
|
|
|
|
netif_receive_skb(skb);
|
|
|
|
dev_put(dev);
|
|
|
|
work++;
|
|
|
|
if (work >= quota || jiffies - start_time > 1)
|
|
break;
|
|
|
|
}
|
|
|
|
backlog_dev->quota -= work;
|
|
*budget -= work;
|
|
return -1;
|
|
|
|
job_done:
|
|
backlog_dev->quota -= work;
|
|
*budget -= work;
|
|
|
|
list_del(&backlog_dev->poll_list);
|
|
smp_mb__before_clear_bit();
|
|
netif_poll_enable(backlog_dev);
|
|
|
|
local_irq_enable();
|
|
return 0;
|
|
}
|
|
|
|
static void net_rx_action(struct softirq_action *h)
|
|
{
|
|
struct softnet_data *queue = &__get_cpu_var(softnet_data);
|
|
unsigned long start_time = jiffies;
|
|
int budget = netdev_budget;
|
|
|
|
local_irq_disable();
|
|
|
|
while (!list_empty(&queue->poll_list)) {
|
|
struct net_device *dev;
|
|
|
|
if (budget <= 0 || jiffies - start_time > 1)
|
|
goto softnet_break;
|
|
|
|
local_irq_enable();
|
|
|
|
dev = list_entry(queue->poll_list.next,
|
|
struct net_device, poll_list);
|
|
netpoll_poll_lock(dev);
|
|
|
|
if (dev->quota <= 0 || dev->poll(dev, &budget)) {
|
|
netpoll_poll_unlock(dev);
|
|
local_irq_disable();
|
|
list_del(&dev->poll_list);
|
|
list_add_tail(&dev->poll_list, &queue->poll_list);
|
|
if (dev->quota < 0)
|
|
dev->quota += dev->weight;
|
|
else
|
|
dev->quota = dev->weight;
|
|
} else {
|
|
netpoll_poll_unlock(dev);
|
|
dev_put(dev);
|
|
local_irq_disable();
|
|
}
|
|
}
|
|
out:
|
|
local_irq_enable();
|
|
return;
|
|
|
|
softnet_break:
|
|
__get_cpu_var(netdev_rx_stat).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;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 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;
|
|
|
|
read_lock(&dev_base_lock);
|
|
dev = __dev_get_by_index(ifr.ifr_ifindex);
|
|
if (!dev) {
|
|
read_unlock(&dev_base_lock);
|
|
return -ENODEV;
|
|
}
|
|
|
|
strcpy(ifr.ifr_name, dev->name);
|
|
read_unlock(&dev_base_lock);
|
|
|
|
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(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 (dev = dev_base; dev; dev = dev->next) {
|
|
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
|
|
/*
|
|
* This is invoked by the /proc filesystem handler to display a device
|
|
* in detail.
|
|
*/
|
|
static __inline__ struct net_device *dev_get_idx(loff_t pos)
|
|
{
|
|
struct net_device *dev;
|
|
loff_t i;
|
|
|
|
for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next);
|
|
|
|
return i == pos ? dev : NULL;
|
|
}
|
|
|
|
void *dev_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
read_lock(&dev_base_lock);
|
|
return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN;
|
|
}
|
|
|
|
void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
++*pos;
|
|
return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next;
|
|
}
|
|
|
|
void dev_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
read_unlock(&dev_base_lock);
|
|
}
|
|
|
|
static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
|
|
{
|
|
if (dev->get_stats) {
|
|
struct net_device_stats *stats = dev->get_stats(dev);
|
|
|
|
seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
|
|
"%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\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);
|
|
} else
|
|
seq_printf(seq, "%6s: No statistics available.\n", dev->name);
|
|
}
|
|
|
|
/*
|
|
* 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 netif_rx_stats *softnet_get_online(loff_t *pos)
|
|
{
|
|
struct netif_rx_stats *rc = NULL;
|
|
|
|
while (*pos < NR_CPUS)
|
|
if (cpu_online(*pos)) {
|
|
rc = &per_cpu(netdev_rx_stat, *pos);
|
|
break;
|
|
} else
|
|
++*pos;
|
|
return rc;
|
|
}
|
|
|
|
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 netif_rx_stats *s = v;
|
|
|
|
seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
|
|
s->total, s->dropped, s->time_squeeze, 0,
|
|
0, 0, 0, 0, /* was fastroute */
|
|
s->cpu_collision );
|
|
return 0;
|
|
}
|
|
|
|
static 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(file, &dev_seq_ops);
|
|
}
|
|
|
|
static struct file_operations dev_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = dev_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static 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 struct file_operations softnet_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = softnet_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
#ifdef WIRELESS_EXT
|
|
extern int wireless_proc_init(void);
|
|
#else
|
|
#define wireless_proc_init() 0
|
|
#endif
|
|
|
|
static int __init dev_proc_init(void)
|
|
{
|
|
int rc = -ENOMEM;
|
|
|
|
if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops))
|
|
goto out;
|
|
if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
|
|
goto out_dev;
|
|
if (wireless_proc_init())
|
|
goto out_softnet;
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
out_softnet:
|
|
proc_net_remove("softnet_stat");
|
|
out_dev:
|
|
proc_net_remove("dev");
|
|
goto out;
|
|
}
|
|
#else
|
|
#define dev_proc_init() 0
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
|
|
/**
|
|
* netdev_set_master - set up 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 the reference counts
|
|
* are adjusted, %RTM_NEWLINK is sent to the routing socket 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;
|
|
|
|
synchronize_net();
|
|
|
|
if (old)
|
|
dev_put(old);
|
|
|
|
if (master)
|
|
slave->flags |= IFF_SLAVE;
|
|
else
|
|
slave->flags &= ~IFF_SLAVE;
|
|
|
|
rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dev_set_promiscuity - update promiscuity count on a device
|
|
* @dev: device
|
|
* @inc: modifier
|
|
*
|
|
* Add or remove promsicuity 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.
|
|
*/
|
|
void dev_set_promiscuity(struct net_device *dev, int inc)
|
|
{
|
|
unsigned short old_flags = dev->flags;
|
|
|
|
if ((dev->promiscuity += inc) == 0)
|
|
dev->flags &= ~IFF_PROMISC;
|
|
else
|
|
dev->flags |= IFF_PROMISC;
|
|
if (dev->flags != old_flags) {
|
|
dev_mc_upload(dev);
|
|
printk(KERN_INFO "device %s %s promiscuous mode\n",
|
|
dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
|
|
"left");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
|
|
void dev_set_allmulti(struct net_device *dev, int inc)
|
|
{
|
|
unsigned short old_flags = dev->flags;
|
|
|
|
dev->flags |= IFF_ALLMULTI;
|
|
if ((dev->allmulti += inc) == 0)
|
|
dev->flags &= ~IFF_ALLMULTI;
|
|
if (dev->flags ^ old_flags)
|
|
dev_mc_upload(dev);
|
|
}
|
|
|
|
unsigned dev_get_flags(const struct net_device *dev)
|
|
{
|
|
unsigned flags;
|
|
|
|
flags = (dev->flags & ~(IFF_PROMISC |
|
|
IFF_ALLMULTI |
|
|
IFF_RUNNING)) |
|
|
(dev->gflags & (IFF_PROMISC |
|
|
IFF_ALLMULTI));
|
|
|
|
if (netif_running(dev) && netif_carrier_ok(dev))
|
|
flags |= IFF_RUNNING;
|
|
|
|
return flags;
|
|
}
|
|
|
|
int dev_change_flags(struct net_device *dev, unsigned flags)
|
|
{
|
|
int ret;
|
|
int old_flags = dev->flags;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
dev_mc_upload(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_mc_upload(dev);
|
|
}
|
|
|
|
if (dev->flags & IFF_UP &&
|
|
((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
|
|
IFF_VOLATILE)))
|
|
notifier_call_chain(&netdev_chain, NETDEV_CHANGE, 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);
|
|
}
|
|
|
|
if (old_flags ^ dev->flags)
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int dev_set_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
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 (dev->change_mtu)
|
|
err = dev->change_mtu(dev, new_mtu);
|
|
else
|
|
dev->mtu = new_mtu;
|
|
if (!err && dev->flags & IFF_UP)
|
|
notifier_call_chain(&netdev_chain,
|
|
NETDEV_CHANGEMTU, dev);
|
|
return err;
|
|
}
|
|
|
|
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
|
|
{
|
|
int err;
|
|
|
|
if (!dev->set_mac_address)
|
|
return -EOPNOTSUPP;
|
|
if (sa->sa_family != dev->type)
|
|
return -EINVAL;
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
err = dev->set_mac_address(dev, sa);
|
|
if (!err)
|
|
notifier_call_chain(&netdev_chain, NETDEV_CHANGEADDR, dev);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Perform the SIOCxIFxxx calls.
|
|
*/
|
|
static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
|
|
{
|
|
int err;
|
|
struct net_device *dev = __dev_get_by_name(ifr->ifr_name);
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
switch (cmd) {
|
|
case SIOCGIFFLAGS: /* Get interface flags */
|
|
ifr->ifr_flags = dev_get_flags(dev);
|
|
return 0;
|
|
|
|
case SIOCSIFFLAGS: /* Set interface flags */
|
|
return dev_change_flags(dev, ifr->ifr_flags);
|
|
|
|
case SIOCGIFMETRIC: /* Get the metric on the interface
|
|
(currently unused) */
|
|
ifr->ifr_metric = 0;
|
|
return 0;
|
|
|
|
case SIOCSIFMETRIC: /* Set the metric on the interface
|
|
(currently unused) */
|
|
return -EOPNOTSUPP;
|
|
|
|
case SIOCGIFMTU: /* Get the MTU of a device */
|
|
ifr->ifr_mtu = dev->mtu;
|
|
return 0;
|
|
|
|
case SIOCSIFMTU: /* Set the MTU of a device */
|
|
return dev_set_mtu(dev, ifr->ifr_mtu);
|
|
|
|
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 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));
|
|
notifier_call_chain(&netdev_chain,
|
|
NETDEV_CHANGEADDR, dev);
|
|
return 0;
|
|
|
|
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 SIOCSIFMAP:
|
|
if (dev->set_config) {
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
return dev->set_config(dev, &ifr->ifr_map);
|
|
}
|
|
return -EOPNOTSUPP;
|
|
|
|
case SIOCADDMULTI:
|
|
if (!dev->set_multicast_list ||
|
|
ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
|
|
return -EINVAL;
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
|
|
dev->addr_len, 1);
|
|
|
|
case SIOCDELMULTI:
|
|
if (!dev->set_multicast_list ||
|
|
ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
|
|
return -EINVAL;
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
|
|
dev->addr_len, 1);
|
|
|
|
case SIOCGIFINDEX:
|
|
ifr->ifr_ifindex = dev->ifindex;
|
|
return 0;
|
|
|
|
case SIOCGIFTXQLEN:
|
|
ifr->ifr_qlen = dev->tx_queue_len;
|
|
return 0;
|
|
|
|
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);
|
|
|
|
/*
|
|
* 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 == SIOCWANDEV) {
|
|
err = -EOPNOTSUPP;
|
|
if (dev->do_ioctl) {
|
|
if (netif_device_present(dev))
|
|
err = dev->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
|
|
* @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(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_shlock();
|
|
ret = dev_ifconf((char __user *) arg);
|
|
rtnl_shunlock();
|
|
return ret;
|
|
}
|
|
if (cmd == SIOCGIFNAME)
|
|
return dev_ifname((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(ifr.ifr_name);
|
|
read_lock(&dev_base_lock);
|
|
ret = dev_ifsioc(&ifr, cmd);
|
|
read_unlock(&dev_base_lock);
|
|
if (!ret) {
|
|
if (colon)
|
|
*colon = ':';
|
|
if (copy_to_user(arg, &ifr,
|
|
sizeof(struct ifreq)))
|
|
ret = -EFAULT;
|
|
}
|
|
return ret;
|
|
|
|
case SIOCETHTOOL:
|
|
dev_load(ifr.ifr_name);
|
|
rtnl_lock();
|
|
ret = dev_ethtool(&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(ifr.ifr_name);
|
|
rtnl_lock();
|
|
ret = dev_ifsioc(&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 SIOCBONDSLAVEINFOQUERY:
|
|
case SIOCBONDINFOQUERY:
|
|
case SIOCBONDCHANGEACTIVE:
|
|
case SIOCBRADDIF:
|
|
case SIOCBRDELIF:
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
dev_load(ifr.ifr_name);
|
|
rtnl_lock();
|
|
ret = dev_ifsioc(&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 -EINVAL;
|
|
|
|
/*
|
|
* Unknown or private ioctl.
|
|
*/
|
|
default:
|
|
if (cmd == SIOCWANDEV ||
|
|
(cmd >= SIOCDEVPRIVATE &&
|
|
cmd <= SIOCDEVPRIVATE + 15)) {
|
|
dev_load(ifr.ifr_name);
|
|
rtnl_lock();
|
|
ret = dev_ifsioc(&ifr, cmd);
|
|
rtnl_unlock();
|
|
if (!ret && copy_to_user(arg, &ifr,
|
|
sizeof(struct ifreq)))
|
|
ret = -EFAULT;
|
|
return ret;
|
|
}
|
|
#ifdef WIRELESS_EXT
|
|
/* Take care of Wireless Extensions */
|
|
if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
|
|
/* If command is `set a parameter', or
|
|
* `get the encoding parameters', check if
|
|
* the user has the right to do it */
|
|
if (IW_IS_SET(cmd) || cmd == SIOCGIWENCODE) {
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
}
|
|
dev_load(ifr.ifr_name);
|
|
rtnl_lock();
|
|
/* Follow me in net/core/wireless.c */
|
|
ret = wireless_process_ioctl(&ifr, cmd);
|
|
rtnl_unlock();
|
|
if (IW_IS_GET(cmd) &&
|
|
copy_to_user(arg, &ifr,
|
|
sizeof(struct ifreq)))
|
|
ret = -EFAULT;
|
|
return ret;
|
|
}
|
|
#endif /* WIRELESS_EXT */
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* dev_new_index - allocate an ifindex
|
|
*
|
|
* 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(void)
|
|
{
|
|
static int ifindex;
|
|
for (;;) {
|
|
if (++ifindex <= 0)
|
|
ifindex = 1;
|
|
if (!__dev_get_by_index(ifindex))
|
|
return ifindex;
|
|
}
|
|
}
|
|
|
|
static int dev_boot_phase = 1;
|
|
|
|
/* Delayed registration/unregisteration */
|
|
static DEFINE_SPINLOCK(net_todo_list_lock);
|
|
static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
|
|
|
|
static inline void net_set_todo(struct net_device *dev)
|
|
{
|
|
spin_lock(&net_todo_list_lock);
|
|
list_add_tail(&dev->todo_list, &net_todo_list);
|
|
spin_unlock(&net_todo_list_lock);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct hlist_head *head;
|
|
struct hlist_node *p;
|
|
int ret;
|
|
|
|
BUG_ON(dev_boot_phase);
|
|
ASSERT_RTNL();
|
|
|
|
/* When net_device's are persistent, this will be fatal. */
|
|
BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
|
|
|
|
spin_lock_init(&dev->queue_lock);
|
|
spin_lock_init(&dev->xmit_lock);
|
|
dev->xmit_lock_owner = -1;
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
spin_lock_init(&dev->ingress_lock);
|
|
#endif
|
|
|
|
ret = alloc_divert_blk(dev);
|
|
if (ret)
|
|
goto out;
|
|
|
|
dev->iflink = -1;
|
|
|
|
/* Init, if this function is available */
|
|
if (dev->init) {
|
|
ret = dev->init(dev);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = -EIO;
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
if (!dev_valid_name(dev->name)) {
|
|
ret = -EINVAL;
|
|
goto out_err;
|
|
}
|
|
|
|
dev->ifindex = dev_new_index();
|
|
if (dev->iflink == -1)
|
|
dev->iflink = dev->ifindex;
|
|
|
|
/* Check for existence of name */
|
|
head = dev_name_hash(dev->name);
|
|
hlist_for_each(p, head) {
|
|
struct net_device *d
|
|
= hlist_entry(p, struct net_device, name_hlist);
|
|
if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
|
|
ret = -EEXIST;
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
/* Fix illegal SG+CSUM combinations. */
|
|
if ((dev->features & NETIF_F_SG) &&
|
|
!(dev->features & (NETIF_F_IP_CSUM |
|
|
NETIF_F_NO_CSUM |
|
|
NETIF_F_HW_CSUM))) {
|
|
printk("%s: Dropping NETIF_F_SG since no checksum feature.\n",
|
|
dev->name);
|
|
dev->features &= ~NETIF_F_SG;
|
|
}
|
|
|
|
/* TSO requires that SG is present as well. */
|
|
if ((dev->features & NETIF_F_TSO) &&
|
|
!(dev->features & NETIF_F_SG)) {
|
|
printk("%s: Dropping NETIF_F_TSO since no SG feature.\n",
|
|
dev->name);
|
|
dev->features &= ~NETIF_F_TSO;
|
|
}
|
|
|
|
/*
|
|
* nil rebuild_header routine,
|
|
* that should be never called and used as just bug trap.
|
|
*/
|
|
|
|
if (!dev->rebuild_header)
|
|
dev->rebuild_header = default_rebuild_header;
|
|
|
|
/*
|
|
* Default initial state at registry is that the
|
|
* device is present.
|
|
*/
|
|
|
|
set_bit(__LINK_STATE_PRESENT, &dev->state);
|
|
|
|
dev->next = NULL;
|
|
dev_init_scheduler(dev);
|
|
write_lock_bh(&dev_base_lock);
|
|
*dev_tail = dev;
|
|
dev_tail = &dev->next;
|
|
hlist_add_head(&dev->name_hlist, head);
|
|
hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
|
|
dev_hold(dev);
|
|
dev->reg_state = NETREG_REGISTERING;
|
|
write_unlock_bh(&dev_base_lock);
|
|
|
|
/* Notify protocols, that a new device appeared. */
|
|
notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
|
|
|
|
/* Finish registration after unlock */
|
|
net_set_todo(dev);
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
out_err:
|
|
free_divert_blk(dev);
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* 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_netdev 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();
|
|
|
|
/*
|
|
* If the name is a format string the caller wants us to do a
|
|
* name allocation.
|
|
*/
|
|
if (strchr(dev->name, '%')) {
|
|
err = dev_alloc_name(dev, dev->name);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Back compatibility hook. Kill this one in 2.5
|
|
*/
|
|
if (dev->name[0] == 0 || dev->name[0] == ' ') {
|
|
err = dev_alloc_name(dev, "eth%d");
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
err = register_netdevice(dev);
|
|
out:
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(register_netdev);
|
|
|
|
/*
|
|
* 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;
|
|
|
|
rebroadcast_time = warning_time = jiffies;
|
|
while (atomic_read(&dev->refcnt) != 0) {
|
|
if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
|
|
rtnl_shlock();
|
|
|
|
/* Rebroadcast unregister notification */
|
|
notifier_call_chain(&netdev_chain,
|
|
NETDEV_UNREGISTER, dev);
|
|
|
|
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_shunlock();
|
|
|
|
rebroadcast_time = jiffies;
|
|
}
|
|
|
|
msleep(250);
|
|
|
|
if (time_after(jiffies, warning_time + 10 * HZ)) {
|
|
printk(KERN_EMERG "unregister_netdevice: "
|
|
"waiting for %s to become free. Usage "
|
|
"count = %d\n",
|
|
dev->name, atomic_read(&dev->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() after it drops the semaphore.
|
|
* This allows us to deal with problems:
|
|
* 1) We can create/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.
|
|
*/
|
|
static DECLARE_MUTEX(net_todo_run_mutex);
|
|
void netdev_run_todo(void)
|
|
{
|
|
struct list_head list = LIST_HEAD_INIT(list);
|
|
int err;
|
|
|
|
|
|
/* Need to guard against multiple cpu's getting out of order. */
|
|
down(&net_todo_run_mutex);
|
|
|
|
/* Not safe to do outside the semaphore. We must not return
|
|
* until all unregister events invoked by the local processor
|
|
* have been completed (either by this todo run, or one on
|
|
* another cpu).
|
|
*/
|
|
if (list_empty(&net_todo_list))
|
|
goto out;
|
|
|
|
/* Snapshot list, allow later requests */
|
|
spin_lock(&net_todo_list_lock);
|
|
list_splice_init(&net_todo_list, &list);
|
|
spin_unlock(&net_todo_list_lock);
|
|
|
|
while (!list_empty(&list)) {
|
|
struct net_device *dev
|
|
= list_entry(list.next, struct net_device, todo_list);
|
|
list_del(&dev->todo_list);
|
|
|
|
switch(dev->reg_state) {
|
|
case NETREG_REGISTERING:
|
|
err = netdev_register_sysfs(dev);
|
|
if (err)
|
|
printk(KERN_ERR "%s: failed sysfs registration (%d)\n",
|
|
dev->name, err);
|
|
dev->reg_state = NETREG_REGISTERED;
|
|
break;
|
|
|
|
case NETREG_UNREGISTERING:
|
|
netdev_unregister_sysfs(dev);
|
|
dev->reg_state = NETREG_UNREGISTERED;
|
|
|
|
netdev_wait_allrefs(dev);
|
|
|
|
/* paranoia */
|
|
BUG_ON(atomic_read(&dev->refcnt));
|
|
BUG_TRAP(!dev->ip_ptr);
|
|
BUG_TRAP(!dev->ip6_ptr);
|
|
BUG_TRAP(!dev->dn_ptr);
|
|
|
|
|
|
/* It must be the very last action,
|
|
* after this 'dev' may point to freed up memory.
|
|
*/
|
|
if (dev->destructor)
|
|
dev->destructor(dev);
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_ERR "network todo '%s' but state %d\n",
|
|
dev->name, dev->reg_state);
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
up(&net_todo_run_mutex);
|
|
}
|
|
|
|
/**
|
|
* alloc_netdev - allocate network device
|
|
* @sizeof_priv: size of private data to allocate space for
|
|
* @name: device name format string
|
|
* @setup: callback to initialize device
|
|
*
|
|
* Allocates a struct net_device with private data area for driver use
|
|
* and performs basic initialization.
|
|
*/
|
|
struct net_device *alloc_netdev(int sizeof_priv, const char *name,
|
|
void (*setup)(struct net_device *))
|
|
{
|
|
void *p;
|
|
struct net_device *dev;
|
|
int alloc_size;
|
|
|
|
/* ensure 32-byte alignment of both the device and private area */
|
|
alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
|
|
alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
|
|
|
|
p = kmalloc(alloc_size, GFP_KERNEL);
|
|
if (!p) {
|
|
printk(KERN_ERR "alloc_dev: Unable to allocate device.\n");
|
|
return NULL;
|
|
}
|
|
memset(p, 0, alloc_size);
|
|
|
|
dev = (struct net_device *)
|
|
(((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
|
|
dev->padded = (char *)dev - (char *)p;
|
|
|
|
if (sizeof_priv)
|
|
dev->priv = netdev_priv(dev);
|
|
|
|
setup(dev);
|
|
strcpy(dev->name, name);
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL(alloc_netdev);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
#ifdef CONFIG_SYSFS
|
|
/* Compatiablity 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 class release */
|
|
class_device_put(&dev->class_dev);
|
|
#else
|
|
kfree((char *)dev - dev->padded);
|
|
#endif
|
|
}
|
|
|
|
/* Synchronize with packet receive processing. */
|
|
void synchronize_net(void)
|
|
{
|
|
might_sleep();
|
|
synchronize_rcu();
|
|
}
|
|
|
|
/**
|
|
* unregister_netdevice - remove device from the kernel
|
|
* @dev: device
|
|
*
|
|
* This function shuts down a device interface and removes it
|
|
* from the kernel tables. On success 0 is returned, on a failure
|
|
* a negative errno code is returned.
|
|
*
|
|
* Callers must hold the rtnl semaphore. You may want
|
|
* unregister_netdev() instead of this.
|
|
*/
|
|
|
|
int unregister_netdevice(struct net_device *dev)
|
|
{
|
|
struct net_device *d, **dp;
|
|
|
|
BUG_ON(dev_boot_phase);
|
|
ASSERT_RTNL();
|
|
|
|
/* Some devices call without registering for initialization unwind. */
|
|
if (dev->reg_state == NETREG_UNINITIALIZED) {
|
|
printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
|
|
"was registered\n", dev->name, dev);
|
|
return -ENODEV;
|
|
}
|
|
|
|
BUG_ON(dev->reg_state != NETREG_REGISTERED);
|
|
|
|
/* If device is running, close it first. */
|
|
if (dev->flags & IFF_UP)
|
|
dev_close(dev);
|
|
|
|
/* And unlink it from device chain. */
|
|
for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) {
|
|
if (d == dev) {
|
|
write_lock_bh(&dev_base_lock);
|
|
hlist_del(&dev->name_hlist);
|
|
hlist_del(&dev->index_hlist);
|
|
if (dev_tail == &dev->next)
|
|
dev_tail = dp;
|
|
*dp = d->next;
|
|
write_unlock_bh(&dev_base_lock);
|
|
break;
|
|
}
|
|
}
|
|
if (!d) {
|
|
printk(KERN_ERR "unregister net_device: '%s' not found\n",
|
|
dev->name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
dev->reg_state = NETREG_UNREGISTERING;
|
|
|
|
synchronize_net();
|
|
|
|
/* Shutdown queueing discipline. */
|
|
dev_shutdown(dev);
|
|
|
|
|
|
/* Notify protocols, that we are about to destroy
|
|
this device. They should clean all the things.
|
|
*/
|
|
notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
|
|
|
|
/*
|
|
* Flush the multicast chain
|
|
*/
|
|
dev_mc_discard(dev);
|
|
|
|
if (dev->uninit)
|
|
dev->uninit(dev);
|
|
|
|
/* Notifier chain MUST detach us from master device. */
|
|
BUG_TRAP(!dev->master);
|
|
|
|
free_divert_blk(dev);
|
|
|
|
/* Finish processing unregister after unlock */
|
|
net_set_todo(dev);
|
|
|
|
synchronize_net();
|
|
|
|
dev_put(dev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* unregister_netdev - remove device from the kernel
|
|
* @dev: device
|
|
*
|
|
* This function shuts down a device interface and removes it
|
|
* from the kernel tables. On success 0 is returned, on a failure
|
|
* a negative errno code is returned.
|
|
*
|
|
* 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);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
static int dev_cpu_callback(struct notifier_block *nfb,
|
|
unsigned long action,
|
|
void *ocpu)
|
|
{
|
|
struct sk_buff **list_skb;
|
|
struct net_device **list_net;
|
|
struct sk_buff *skb;
|
|
unsigned int cpu, oldcpu = (unsigned long)ocpu;
|
|
struct softnet_data *sd, *oldsd;
|
|
|
|
if (action != CPU_DEAD)
|
|
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;
|
|
|
|
/* Find end of our output_queue. */
|
|
list_net = &sd->output_queue;
|
|
while (*list_net)
|
|
list_net = &(*list_net)->next_sched;
|
|
/* Append output queue from offline CPU. */
|
|
*list_net = oldsd->output_queue;
|
|
oldsd->output_queue = NULL;
|
|
|
|
raise_softirq_irqoff(NET_TX_SOFTIRQ);
|
|
local_irq_enable();
|
|
|
|
/* Process offline CPU's input_pkt_queue */
|
|
while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
|
|
netif_rx(skb);
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
|
|
/*
|
|
* 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);
|
|
|
|
net_random_init();
|
|
|
|
if (dev_proc_init())
|
|
goto out;
|
|
|
|
if (netdev_sysfs_init())
|
|
goto out;
|
|
|
|
INIT_LIST_HEAD(&ptype_all);
|
|
for (i = 0; i < 16; i++)
|
|
INIT_LIST_HEAD(&ptype_base[i]);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
|
|
INIT_HLIST_HEAD(&dev_name_head[i]);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
|
|
INIT_HLIST_HEAD(&dev_index_head[i]);
|
|
|
|
/*
|
|
* Initialise the packet receive queues.
|
|
*/
|
|
|
|
for (i = 0; i < NR_CPUS; i++) {
|
|
struct softnet_data *queue;
|
|
|
|
queue = &per_cpu(softnet_data, i);
|
|
skb_queue_head_init(&queue->input_pkt_queue);
|
|
queue->completion_queue = NULL;
|
|
INIT_LIST_HEAD(&queue->poll_list);
|
|
set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
|
|
queue->backlog_dev.weight = weight_p;
|
|
queue->backlog_dev.poll = process_backlog;
|
|
atomic_set(&queue->backlog_dev.refcnt, 1);
|
|
}
|
|
|
|
dev_boot_phase = 0;
|
|
|
|
open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
|
|
open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
|
|
|
|
hotcpu_notifier(dev_cpu_callback, 0);
|
|
dst_init();
|
|
dev_mcast_init();
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
subsys_initcall(net_dev_init);
|
|
|
|
EXPORT_SYMBOL(__dev_get_by_index);
|
|
EXPORT_SYMBOL(__dev_get_by_name);
|
|
EXPORT_SYMBOL(__dev_remove_pack);
|
|
EXPORT_SYMBOL(__skb_linearize);
|
|
EXPORT_SYMBOL(dev_add_pack);
|
|
EXPORT_SYMBOL(dev_alloc_name);
|
|
EXPORT_SYMBOL(dev_close);
|
|
EXPORT_SYMBOL(dev_get_by_flags);
|
|
EXPORT_SYMBOL(dev_get_by_index);
|
|
EXPORT_SYMBOL(dev_get_by_name);
|
|
EXPORT_SYMBOL(dev_ioctl);
|
|
EXPORT_SYMBOL(dev_open);
|
|
EXPORT_SYMBOL(dev_queue_xmit);
|
|
EXPORT_SYMBOL(dev_remove_pack);
|
|
EXPORT_SYMBOL(dev_set_allmulti);
|
|
EXPORT_SYMBOL(dev_set_promiscuity);
|
|
EXPORT_SYMBOL(dev_change_flags);
|
|
EXPORT_SYMBOL(dev_set_mtu);
|
|
EXPORT_SYMBOL(dev_set_mac_address);
|
|
EXPORT_SYMBOL(free_netdev);
|
|
EXPORT_SYMBOL(netdev_boot_setup_check);
|
|
EXPORT_SYMBOL(netdev_set_master);
|
|
EXPORT_SYMBOL(netdev_state_change);
|
|
EXPORT_SYMBOL(netif_receive_skb);
|
|
EXPORT_SYMBOL(netif_rx);
|
|
EXPORT_SYMBOL(register_gifconf);
|
|
EXPORT_SYMBOL(register_netdevice);
|
|
EXPORT_SYMBOL(register_netdevice_notifier);
|
|
EXPORT_SYMBOL(skb_checksum_help);
|
|
EXPORT_SYMBOL(synchronize_net);
|
|
EXPORT_SYMBOL(unregister_netdevice);
|
|
EXPORT_SYMBOL(unregister_netdevice_notifier);
|
|
EXPORT_SYMBOL(net_enable_timestamp);
|
|
EXPORT_SYMBOL(net_disable_timestamp);
|
|
EXPORT_SYMBOL(dev_get_flags);
|
|
|
|
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
|
|
EXPORT_SYMBOL(br_handle_frame_hook);
|
|
EXPORT_SYMBOL(br_fdb_get_hook);
|
|
EXPORT_SYMBOL(br_fdb_put_hook);
|
|
#endif
|
|
|
|
#ifdef CONFIG_KMOD
|
|
EXPORT_SYMBOL(dev_load);
|
|
#endif
|
|
|
|
EXPORT_PER_CPU_SYMBOL(softnet_data);
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|
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