dev.c
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上传日期:2013-04-10
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文件大小:68k
- /*
- * NET3 Protocol independent device support routines.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Derived from the non IP parts of dev.c 1.0.19
- * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
- * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
- * Mark Evans, <evansmp@uhura.aston.ac.uk>
- *
- * Additional Authors:
- * Florian la Roche <rzsfl@rz.uni-sb.de>
- * Alan Cox <gw4pts@gw4pts.ampr.org>
- * David Hinds <dahinds@users.sourceforge.net>
- * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
- * Adam Sulmicki <adam@cfar.umd.edu>
- * Pekka Riikonen <priikone@poesidon.pspt.fi>
- *
- * Changes:
- * D.J. Barrow : Fixed bug where dev->refcnt gets set to 2
- * if register_netdev gets called before
- * net_dev_init & also removed a few lines
- * of code in the process.
- * Alan Cox : device private ioctl copies fields back.
- * Alan Cox : Transmit queue code does relevant stunts to
- * keep the queue safe.
- * Alan Cox : Fixed double lock.
- * Alan Cox : Fixed promisc NULL pointer trap
- * ???????? : Support the full private ioctl range
- * Alan Cox : Moved ioctl permission check into drivers
- * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
- * Alan Cox : 100 backlog just doesn't cut it when
- * you start doing multicast video 8)
- * Alan Cox : Rewrote net_bh and list manager.
- * Alan Cox : Fix ETH_P_ALL echoback lengths.
- * Alan Cox : Took out transmit every packet pass
- * Saved a few bytes in the ioctl handler
- * Alan Cox : Network driver sets packet type before calling netif_rx. Saves
- * a function call a packet.
- * Alan Cox : Hashed net_bh()
- * Richard Kooijman: Timestamp fixes.
- * Alan Cox : Wrong field in SIOCGIFDSTADDR
- * Alan Cox : Device lock protection.
- * Alan Cox : Fixed nasty side effect of device close changes.
- * Rudi Cilibrasi : Pass the right thing to set_mac_address()
- * Dave Miller : 32bit quantity for the device lock to make it work out
- * on a Sparc.
- * Bjorn Ekwall : Added KERNELD hack.
- * Alan Cox : Cleaned up the backlog initialise.
- * Craig Metz : SIOCGIFCONF fix if space for under
- * 1 device.
- * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
- * is no device open function.
- * Andi Kleen : Fix error reporting for SIOCGIFCONF
- * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
- * Cyrus Durgin : Cleaned for KMOD
- * Adam Sulmicki : Bug Fix : Network Device Unload
- * A network device unload needs to purge
- * the backlog queue.
- * Paul Rusty Russell : SIOCSIFNAME
- * Pekka Riikonen : Netdev boot-time settings code
- * Andrew Morton : Make unregister_netdevice wait indefinitely on dev->refcnt
- * J Hadi Salim : - Backlog queue sampling
- * - netif_rx() feedback
- */
- #include <asm/uaccess.h>
- #include <asm/system.h>
- #include <asm/bitops.h>
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/string.h>
- #include <linux/mm.h>
- #include <linux/socket.h>
- #include <linux/sockios.h>
- #include <linux/errno.h>
- #include <linux/interrupt.h>
- #include <linux/if_ether.h>
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include <linux/notifier.h>
- #include <linux/skbuff.h>
- #include <linux/brlock.h>
- #include <net/sock.h>
- #include <linux/rtnetlink.h>
- #include <linux/proc_fs.h>
- #include <linux/stat.h>
- #include <linux/if_bridge.h>
- #include <linux/divert.h>
- #include <net/dst.h>
- #include <net/pkt_sched.h>
- #include <net/profile.h>
- #include <net/checksum.h>
- #include <linux/highmem.h>
- #include <linux/init.h>
- #include <linux/kmod.h>
- #include <linux/module.h>
- #if defined(CONFIG_NET_RADIO) || defined(CONFIG_NET_PCMCIA_RADIO)
- #include <linux/wireless.h> /* Note : will define WIRELESS_EXT */
- #include <net/iw_handler.h>
- #endif /* CONFIG_NET_RADIO || CONFIG_NET_PCMCIA_RADIO */
- #ifdef CONFIG_PLIP
- extern int plip_init(void);
- #endif
- /* This define, if set, will randomly drop a packet when congestion
- * is more than moderate. It helps fairness in the multi-interface
- * case when one of them is a hog, but it kills performance for the
- * single interface case so it is off now by default.
- */
- #undef RAND_LIE
- /* Setting this will sample the queue lengths and thus congestion
- * via a timer instead of as each packet is received.
- */
- #undef OFFLINE_SAMPLE
- NET_PROFILE_DEFINE(dev_queue_xmit)
- NET_PROFILE_DEFINE(softnet_process)
- const char *if_port_text[] = {
- "unknown",
- "BNC",
- "10baseT",
- "AUI",
- "100baseT",
- "100baseTX",
- "100baseFX"
- };
- /*
- * The list of packet types we will receive (as opposed to discard)
- * and the routines to invoke.
- *
- * Why 16. Because with 16 the only overlap we get on a hash of the
- * low nibble of the protocol value is RARP/SNAP/X.25.
- *
- * NOTE: That is no longer true with the addition of VLAN tags. Not
- * sure which should go first, but I bet it won't make much
- * difference if we are running VLANs. The good news is that
- * this protocol won't be in the list unless compiled in, so
- * the average user (w/out VLANs) will not be adversly affected.
- * --BLG
- *
- * 0800 IP
- * 8100 802.1Q VLAN
- * 0001 802.3
- * 0002 AX.25
- * 0004 802.2
- * 8035 RARP
- * 0005 SNAP
- * 0805 X.25
- * 0806 ARP
- * 8137 IPX
- * 0009 Localtalk
- * 86DD IPv6
- */
- static struct packet_type *ptype_base[16]; /* 16 way hashed list */
- static struct packet_type *ptype_all = NULL; /* Taps */
- #ifdef OFFLINE_SAMPLE
- static void sample_queue(unsigned long dummy);
- static struct timer_list samp_timer = { function: sample_queue };
- #endif
- #ifdef CONFIG_HOTPLUG
- static int net_run_sbin_hotplug(struct net_device *dev, char *action);
- #else
- #define net_run_sbin_hotplug(dev, action) ({ 0; })
- #endif
- /*
- * Our notifier list
- */
-
- static struct notifier_block *netdev_chain=NULL;
- /*
- * Device drivers call our routines to queue packets here. We empty the
- * queue in the local softnet handler.
- */
- struct softnet_data softnet_data[NR_CPUS] __cacheline_aligned;
- #ifdef CONFIG_NET_FASTROUTE
- int netdev_fastroute;
- int netdev_fastroute_obstacles;
- #endif
- /******************************************************************************************
- Protocol management and registration routines
- *******************************************************************************************/
- /*
- * For efficiency
- */
- int netdev_nit=0;
- /*
- * Add a protocol ID to the list. Now that the input handler is
- * smarter we can dispense with all the messy stuff that used to be
- * here.
- *
- * BEWARE!!! Protocol handlers, mangling input packets,
- * MUST BE last in hash buckets and checking protocol handlers
- * MUST start from promiscous ptype_all chain in net_bh.
- * It is true now, do not change it.
- * Explantion follows: if protocol handler, mangling packet, will
- * be the first on list, it is not able to sense, that packet
- * is cloned and should be copied-on-write, so that it will
- * change it and subsequent readers will get broken packet.
- * --ANK (980803)
- */
- /**
- * dev_add_pack - add packet handler
- * @pt: packet type declaration
- *
- * Add a protocol handler to the networking stack. The passed &packet_type
- * is linked into kernel lists and may not be freed until it has been
- * removed from the kernel lists.
- */
-
- void dev_add_pack(struct packet_type *pt)
- {
- int hash;
- br_write_lock_bh(BR_NETPROTO_LOCK);
- #ifdef CONFIG_NET_FASTROUTE
- /* Hack to detect packet socket */
- if ((pt->data) && ((int)(pt->data)!=1)) {
- netdev_fastroute_obstacles++;
- dev_clear_fastroute(pt->dev);
- }
- #endif
- if (pt->type == htons(ETH_P_ALL)) {
- netdev_nit++;
- pt->next=ptype_all;
- ptype_all=pt;
- } else {
- hash=ntohs(pt->type)&15;
- pt->next = ptype_base[hash];
- ptype_base[hash] = pt;
- }
- br_write_unlock_bh(BR_NETPROTO_LOCK);
- }
- /**
- * dev_remove_pack - remove packet handler
- * @pt: packet type declaration
- *
- * Remove a protocol handler that was previously added to the kernel
- * protocol handlers by dev_add_pack(). The passed &packet_type is removed
- * from the kernel lists and can be freed or reused once this function
- * returns.
- */
-
- void dev_remove_pack(struct packet_type *pt)
- {
- struct packet_type **pt1;
- br_write_lock_bh(BR_NETPROTO_LOCK);
- if (pt->type == htons(ETH_P_ALL)) {
- netdev_nit--;
- pt1=&ptype_all;
- } else {
- pt1=&ptype_base[ntohs(pt->type)&15];
- }
- for (; (*pt1) != NULL; pt1 = &((*pt1)->next)) {
- if (pt == (*pt1)) {
- *pt1 = pt->next;
- #ifdef CONFIG_NET_FASTROUTE
- if (pt->data)
- netdev_fastroute_obstacles--;
- #endif
- br_write_unlock_bh(BR_NETPROTO_LOCK);
- return;
- }
- }
- br_write_unlock_bh(BR_NETPROTO_LOCK);
- printk(KERN_WARNING "dev_remove_pack: %p not found.n", pt);
- }
- /******************************************************************************
- Device Boot-time Settings Routines
- *******************************************************************************/
- /* Boot time configuration table */
- static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
- /**
- * netdev_boot_setup_add - add new setup entry
- * @name: name of the device
- * @map: configured settings for the device
- *
- * Adds new setup entry to the dev_boot_setup list. The function
- * returns 0 on error and 1 on success. This is a generic routine to
- * all netdevices.
- */
- int netdev_boot_setup_add(char *name, struct ifmap *map)
- {
- struct netdev_boot_setup *s;
- int i;
- s = dev_boot_setup;
- for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
- if (s[i].name[0] == ' ' || s[i].name[0] == ' ') {
- memset(s[i].name, 0, sizeof(s[i].name));
- strcpy(s[i].name, name);
- memcpy(&s[i].map, map, sizeof(s[i].map));
- break;
- }
- }
- if (i >= NETDEV_BOOT_SETUP_MAX)
- return 0;
- return 1;
- }
- /**
- * netdev_boot_setup_check - check boot time settings
- * @dev: the netdevice
- *
- * Check boot time settings for the device.
- * The found settings are set for the device to be used
- * later in the device probing.
- * Returns 0 if no settings found, 1 if they are.
- */
- int netdev_boot_setup_check(struct net_device *dev)
- {
- struct netdev_boot_setup *s;
- int i;
- s = dev_boot_setup;
- for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
- if (s[i].name[0] != ' ' && s[i].name[0] != ' ' &&
- !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
- dev->irq = s[i].map.irq;
- dev->base_addr = s[i].map.base_addr;
- dev->mem_start = s[i].map.mem_start;
- dev->mem_end = s[i].map.mem_end;
- return 1;
- }
- }
- return 0;
- }
- /*
- * Saves at boot time configured settings for any netdevice.
- */
- int __init netdev_boot_setup(char *str)
- {
- int ints[5];
- struct ifmap map;
- str = get_options(str, ARRAY_SIZE(ints), ints);
- if (!str || !*str)
- return 0;
- /* Save settings */
- memset(&map, 0, sizeof(map));
- if (ints[0] > 0)
- map.irq = ints[1];
- if (ints[0] > 1)
- map.base_addr = ints[2];
- if (ints[0] > 2)
- map.mem_start = ints[3];
- if (ints[0] > 3)
- map.mem_end = ints[4];
- /* Add new entry to the list */
- return netdev_boot_setup_add(str, &map);
- }
- __setup("netdev=", netdev_boot_setup);
- /*****************************************************************************************
- Device Interface Subroutines
- ******************************************************************************************/
- /**
- * __dev_get_by_name - find a device by its name
- * @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 net_device *dev;
- for (dev = dev_base; dev != NULL; dev = dev->next) {
- if (strncmp(dev->name, name, IFNAMSIZ) == 0)
- 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;
- }
- /*
- Return value is changed to int to prevent illegal usage in future.
- It is still legal to use to check for device existence.
- User should understand, that the result returned by this function
- is meaningless, if it was not issued under rtnl semaphore.
- */
- /**
- * dev_get - test if a device exists
- * @name: name to test for
- *
- * Test if a name exists. Returns true if the name is found. In order
- * to be sure the name is not allocated or removed during the test the
- * caller must hold the rtnl semaphore.
- *
- * This function primarily exists for back compatibility with older
- * drivers.
- */
-
- int dev_get(const char *name)
- {
- struct net_device *dev;
- read_lock(&dev_base_lock);
- dev = __dev_get_by_name(name);
- read_unlock(&dev_base_lock);
- return dev != 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 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 net_device *dev;
- for (dev = dev_base; dev != NULL; dev = dev->next) {
- 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 != NULL; dev = dev->next) {
- if (dev->type == type &&
- memcmp(dev->dev_addr, ha, dev->addr_len) == 0)
- return dev;
- }
- return NULL;
- }
- /**
- * 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;
- char buf[32];
- char *p;
- /*
- * Verify the string as this thing may have come from
- * the user. There must be either one "%d" and no other "%"
- * characters, or no "%" characters at all.
- */
- p = strchr(name, '%');
- if (p && (p[1] != 'd' || strchr(p+2, '%')))
- return -EINVAL;
- /*
- * If you need over 100 please also fix the algorithm...
- */
- for (i = 0; i < 100; i++) {
- snprintf(buf,sizeof(buf),name,i);
- if (__dev_get_by_name(buf) == NULL) {
- strcpy(dev->name, buf);
- return i;
- }
- }
- return -ENFILE; /* Over 100 of the things .. bail out! */
- }
- /**
- * dev_alloc - allocate a network device and name
- * @name: name format string
- * @err: error return pointer
- *
- * Passed a format string, eg. "lt%d", it will allocate a network device
- * and space for the name. %NULL is returned if no memory is available.
- * If the allocation succeeds then the name is assigned and the
- * device pointer returned. %NULL is returned if the name allocation
- * failed. The cause of an error is returned as a negative errno code
- * in the variable @err points to.
- *
- * The caller must hold the @dev_base or RTNL locks when doing this in
- * order to avoid duplicate name allocations.
- */
- struct net_device *dev_alloc(const char *name, int *err)
- {
- struct net_device *dev=kmalloc(sizeof(struct net_device), GFP_KERNEL);
- if (dev == NULL) {
- *err = -ENOBUFS;
- return NULL;
- }
- memset(dev, 0, sizeof(struct net_device));
- *err = dev_alloc_name(dev, name);
- if (*err < 0) {
- kfree(dev);
- return NULL;
- }
- return dev;
- }
- /**
- * 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);
- }
- }
- #ifdef CONFIG_KMOD
- /**
- * 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)
- {
- if (!dev_get(name) && capable(CAP_SYS_MODULE))
- request_module(name);
- }
- #else
- extern inline void dev_load(const char *unused){;}
- #endif
- 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
- */
- if (try_inc_mod_count(dev->owner)) {
- set_bit(__LINK_STATE_START, &dev->state);
- if (dev->open) {
- ret = dev->open(dev);
- if (ret != 0) {
- clear_bit(__LINK_STATE_START, &dev->state);
- if (dev->owner)
- __MOD_DEC_USE_COUNT(dev->owner);
- }
- }
- } else {
- ret = -ENODEV;
- }
- /*
- * If it went open OK then:
- */
-
- if (ret == 0)
- {
- /*
- * 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);
- }
- #ifdef CONFIG_NET_FASTROUTE
- static void dev_do_clear_fastroute(struct net_device *dev)
- {
- if (dev->accept_fastpath) {
- int i;
- for (i=0; i<=NETDEV_FASTROUTE_HMASK; i++) {
- struct dst_entry *dst;
- write_lock_irq(&dev->fastpath_lock);
- dst = dev->fastpath[i];
- dev->fastpath[i] = NULL;
- write_unlock_irq(&dev->fastpath_lock);
- dst_release(dst);
- }
- }
- }
- void dev_clear_fastroute(struct net_device *dev)
- {
- if (dev) {
- dev_do_clear_fastroute(dev);
- } else {
- read_lock(&dev_base_lock);
- for (dev = dev_base; dev; dev = dev->next)
- dev_do_clear_fastroute(dev);
- read_unlock(&dev_base_lock);
- }
- }
- #endif
- /**
- * 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;
- #ifdef CONFIG_NET_FASTROUTE
- dev_clear_fastroute(dev);
- #endif
- /*
- * Tell people we are down
- */
- notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
- /*
- * Drop the module refcount
- */
- if (dev->owner)
- __MOD_DEC_USE_COUNT(dev->owner);
- 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.
- */
- int register_netdevice_notifier(struct notifier_block *nb)
- {
- return notifier_chain_register(&netdev_chain, nb);
- }
- /**
- * 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);
- }
- /*
- * 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;
- do_gettimeofday(&skb->stamp);
- br_read_lock(BR_NETPROTO_LOCK);
- for (ptype = ptype_all; ptype!=NULL; ptype = ptype->next)
- {
- /* Never send packets back to the socket
- * they originated from - MvS (miquels@drinkel.ow.org)
- */
- if ((ptype->dev == dev || !ptype->dev) &&
- ((struct sock *)ptype->data != skb->sk))
- {
- struct sk_buff *skb2;
- if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL)
- 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 %sn", 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);
- }
- }
- br_read_unlock(BR_NETPROTO_LOCK);
- }
- /* Calculate csum in the case, when packet is misrouted.
- * If it failed by some reason, ignore and send skb with wrong
- * checksum.
- */
- struct sk_buff * skb_checksum_help(struct sk_buff *skb)
- {
- int offset;
- unsigned int csum;
- offset = skb->h.raw - skb->data;
- 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;
- return skb;
- }
- #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 (skb_shinfo(skb)->frags[i].page >= highmem_start_page)
- return 1;
- return 0;
- }
- #else
- #define illegal_highdma(dev, skb) (0)
- #endif
- /**
- * 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.
- */
- int dev_queue_xmit(struct sk_buff *skb)
- {
- struct net_device *dev = skb->dev;
- struct Qdisc *q;
- if (skb_shinfo(skb)->frag_list &&
- !(dev->features&NETIF_F_FRAGLIST) &&
- skb_linearize(skb, GFP_ATOMIC) != 0) {
- kfree_skb(skb);
- return -ENOMEM;
- }
- /* 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) != 0) {
- kfree_skb(skb);
- return -ENOMEM;
- }
- /* 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 = skb_checksum_help(skb)) == NULL)
- return -ENOMEM;
- }
- /* Grab device queue */
- spin_lock_bh(&dev->queue_lock);
- q = dev->qdisc;
- if (q->enqueue) {
- int ret = q->enqueue(skb, q);
- qdisc_run(dev);
- spin_unlock_bh(&dev->queue_lock);
- return ret == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : ret;
- }
- /* 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();
- if (dev->xmit_lock_owner != cpu) {
- spin_unlock(&dev->queue_lock);
- spin_lock(&dev->xmit_lock);
- dev->xmit_lock_owner = cpu;
- if (!netif_queue_stopped(dev)) {
- if (netdev_nit)
- dev_queue_xmit_nit(skb,dev);
- if (dev->hard_start_xmit(skb, dev) == 0) {
- dev->xmit_lock_owner = -1;
- spin_unlock_bh(&dev->xmit_lock);
- return 0;
- }
- }
- dev->xmit_lock_owner = -1;
- spin_unlock_bh(&dev->xmit_lock);
- if (net_ratelimit())
- printk(KERN_CRIT "Virtual device %s asks to queue packet!n", dev->name);
- kfree_skb(skb);
- return -ENETDOWN;
- } 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);
- }
- }
- spin_unlock_bh(&dev->queue_lock);
- kfree_skb(skb);
- return -ENETDOWN;
- }
- /*=======================================================================
- Receiver routines
- =======================================================================*/
- int netdev_max_backlog = 300;
- int weight_p = 64; /* old backlog weight */
- /* These numbers are selected based on intuition and some
- * experimentatiom, if you have more scientific way of doing this
- * please go ahead and fix things.
- */
- int no_cong_thresh = 10;
- int no_cong = 20;
- int lo_cong = 100;
- int mod_cong = 290;
- struct netif_rx_stats netdev_rx_stat[NR_CPUS];
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- atomic_t netdev_dropping = ATOMIC_INIT(0);
- static unsigned long netdev_fc_mask = 1;
- unsigned long netdev_fc_xoff = 0;
- spinlock_t netdev_fc_lock = SPIN_LOCK_UNLOCKED;
- static struct
- {
- void (*stimul)(struct net_device *);
- struct net_device *dev;
- } netdev_fc_slots[BITS_PER_LONG];
- int netdev_register_fc(struct net_device *dev, void (*stimul)(struct net_device *dev))
- {
- int bit = 0;
- unsigned long flags;
- spin_lock_irqsave(&netdev_fc_lock, flags);
- if (netdev_fc_mask != ~0UL) {
- bit = ffz(netdev_fc_mask);
- netdev_fc_slots[bit].stimul = stimul;
- netdev_fc_slots[bit].dev = dev;
- set_bit(bit, &netdev_fc_mask);
- clear_bit(bit, &netdev_fc_xoff);
- }
- spin_unlock_irqrestore(&netdev_fc_lock, flags);
- return bit;
- }
- void netdev_unregister_fc(int bit)
- {
- unsigned long flags;
- spin_lock_irqsave(&netdev_fc_lock, flags);
- if (bit > 0) {
- netdev_fc_slots[bit].stimul = NULL;
- netdev_fc_slots[bit].dev = NULL;
- clear_bit(bit, &netdev_fc_mask);
- clear_bit(bit, &netdev_fc_xoff);
- }
- spin_unlock_irqrestore(&netdev_fc_lock, flags);
- }
- static void netdev_wakeup(void)
- {
- unsigned long xoff;
- spin_lock(&netdev_fc_lock);
- xoff = netdev_fc_xoff;
- netdev_fc_xoff = 0;
- while (xoff) {
- int i = ffz(~xoff);
- xoff &= ~(1<<i);
- netdev_fc_slots[i].stimul(netdev_fc_slots[i].dev);
- }
- spin_unlock(&netdev_fc_lock);
- }
- #endif
- static void get_sample_stats(int cpu)
- {
- #ifdef RAND_LIE
- unsigned long rd;
- int rq;
- #endif
- int blog = softnet_data[cpu].input_pkt_queue.qlen;
- int avg_blog = softnet_data[cpu].avg_blog;
- avg_blog = (avg_blog >> 1)+ (blog >> 1);
- if (avg_blog > mod_cong) {
- /* Above moderate congestion levels. */
- softnet_data[cpu].cng_level = NET_RX_CN_HIGH;
- #ifdef RAND_LIE
- rd = net_random();
- rq = rd % netdev_max_backlog;
- if (rq < avg_blog) /* unlucky bastard */
- softnet_data[cpu].cng_level = NET_RX_DROP;
- #endif
- } else if (avg_blog > lo_cong) {
- softnet_data[cpu].cng_level = NET_RX_CN_MOD;
- #ifdef RAND_LIE
- rd = net_random();
- rq = rd % netdev_max_backlog;
- if (rq < avg_blog) /* unlucky bastard */
- softnet_data[cpu].cng_level = NET_RX_CN_HIGH;
- #endif
- } else if (avg_blog > no_cong)
- softnet_data[cpu].cng_level = NET_RX_CN_LOW;
- else /* no congestion */
- softnet_data[cpu].cng_level = NET_RX_SUCCESS;
- softnet_data[cpu].avg_blog = avg_blog;
- }
- #ifdef OFFLINE_SAMPLE
- static void sample_queue(unsigned long dummy)
- {
- /* 10 ms 0r 1ms -- i dont care -- JHS */
- int next_tick = 1;
- int cpu = smp_processor_id();
- get_sample_stats(cpu);
- next_tick += jiffies;
- mod_timer(&samp_timer, next_tick);
- }
- #endif
- /**
- * 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)
- {
- int this_cpu = smp_processor_id();
- struct softnet_data *queue;
- unsigned long flags;
- if (skb->stamp.tv_sec == 0)
- do_gettimeofday(&skb->stamp);
- /* The code is rearranged so that the path is the most
- short when CPU is congested, but is still operating.
- */
- queue = &softnet_data[this_cpu];
- local_irq_save(flags);
- netdev_rx_stat[this_cpu].total++;
- if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
- if (queue->input_pkt_queue.qlen) {
- if (queue->throttle)
- goto drop;
- enqueue:
- dev_hold(skb->dev);
- __skb_queue_tail(&queue->input_pkt_queue,skb);
- local_irq_restore(flags);
- #ifndef OFFLINE_SAMPLE
- get_sample_stats(this_cpu);
- #endif
- return queue->cng_level;
- }
- if (queue->throttle) {
- queue->throttle = 0;
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- if (atomic_dec_and_test(&netdev_dropping))
- netdev_wakeup();
- #endif
- }
- netif_rx_schedule(&queue->blog_dev);
- goto enqueue;
- }
- if (queue->throttle == 0) {
- queue->throttle = 1;
- netdev_rx_stat[this_cpu].throttled++;
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- atomic_inc(&netdev_dropping);
- #endif
- }
- drop:
- netdev_rx_stat[this_cpu].dropped++;
- local_irq_restore(flags);
- kfree_skb(skb);
- return NET_RX_DROP;
- }
- /* Deliver skb to an old protocol, which is not threaded well
- or which do not understand shared skbs.
- */
- static int deliver_to_old_ones(struct packet_type *pt, struct sk_buff *skb, int last)
- {
- static spinlock_t net_bh_lock = SPIN_LOCK_UNLOCKED;
- int ret = NET_RX_DROP;
- if (!last) {
- skb = skb_clone(skb, GFP_ATOMIC);
- if (skb == NULL)
- return ret;
- }
- if (skb_is_nonlinear(skb) && skb_linearize(skb, GFP_ATOMIC) != 0) {
- kfree_skb(skb);
- return ret;
- }
- /* The assumption (correct one) is that old protocols
- did not depened on BHs different of NET_BH and TIMER_BH.
- */
- /* Emulate NET_BH with special spinlock */
- spin_lock(&net_bh_lock);
- /* Disable timers and wait for all timers completion */
- tasklet_disable(bh_task_vec+TIMER_BH);
- ret = pt->func(skb, skb->dev, pt);
- tasklet_hi_enable(bh_task_vec+TIMER_BH);
- spin_unlock(&net_bh_lock);
- return ret;
- }
- static __inline__ void skb_bond(struct sk_buff *skb)
- {
- struct net_device *dev = skb->dev;
- if (dev->master)
- skb->dev = dev->master;
- }
- static void net_tx_action(struct softirq_action *h)
- {
- int cpu = smp_processor_id();
- if (softnet_data[cpu].completion_queue) {
- struct sk_buff *clist;
- local_irq_disable();
- clist = softnet_data[cpu].completion_queue;
- softnet_data[cpu].completion_queue = NULL;
- local_irq_enable();
- while (clist != NULL) {
- struct sk_buff *skb = clist;
- clist = clist->next;
- BUG_TRAP(atomic_read(&skb->users) == 0);
- __kfree_skb(skb);
- }
- }
- if (softnet_data[cpu].output_queue) {
- struct net_device *head;
- local_irq_disable();
- head = softnet_data[cpu].output_queue;
- softnet_data[cpu].output_queue = NULL;
- local_irq_enable();
- while (head != NULL) {
- 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);
- }
- }
- }
- }
- #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
- void (*br_handle_frame_hook)(struct sk_buff *skb) = NULL;
- #endif
- static __inline__ int handle_bridge(struct sk_buff *skb,
- struct packet_type *pt_prev)
- {
- int ret = NET_RX_DROP;
- if (pt_prev) {
- if (!pt_prev->data)
- ret = deliver_to_old_ones(pt_prev, skb, 0);
- else {
- atomic_inc(&skb->users);
- ret = pt_prev->func(skb, skb->dev, pt_prev);
- }
- }
- br_handle_frame_hook(skb);
- return ret;
- }
- #ifdef CONFIG_NET_DIVERT
- static inline int handle_diverter(struct sk_buff *skb)
- {
- /* if diversion is supported on device, then divert */
- if (skb->dev->divert && skb->dev->divert->divert)
- divert_frame(skb);
- return 0;
- }
- #endif /* CONFIG_NET_DIVERT */
- int netif_receive_skb(struct sk_buff *skb)
- {
- struct packet_type *ptype, *pt_prev;
- int ret = NET_RX_DROP;
- unsigned short type = skb->protocol;
- if (skb->stamp.tv_sec == 0)
- do_gettimeofday(&skb->stamp);
- skb_bond(skb);
- netdev_rx_stat[smp_processor_id()].total++;
- #ifdef CONFIG_NET_FASTROUTE
- if (skb->pkt_type == PACKET_FASTROUTE) {
- netdev_rx_stat[smp_processor_id()].fastroute_deferred_out++;
- return dev_queue_xmit(skb);
- }
- #endif
- skb->h.raw = skb->nh.raw = skb->data;
- pt_prev = NULL;
- for (ptype = ptype_all; ptype; ptype = ptype->next) {
- if (!ptype->dev || ptype->dev == skb->dev) {
- if (pt_prev) {
- if (!pt_prev->data) {
- ret = deliver_to_old_ones(pt_prev, skb, 0);
- } else {
- atomic_inc(&skb->users);
- ret = pt_prev->func(skb, skb->dev, pt_prev);
- }
- }
- pt_prev = ptype;
- }
- }
- #ifdef CONFIG_NET_DIVERT
- if (skb->dev->divert && skb->dev->divert->divert)
- ret = handle_diverter(skb);
- #endif /* CONFIG_NET_DIVERT */
-
- #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
- if (skb->dev->br_port != NULL &&
- br_handle_frame_hook != NULL) {
- return handle_bridge(skb, pt_prev);
- }
- #endif
- for (ptype=ptype_base[ntohs(type)&15];ptype;ptype=ptype->next) {
- if (ptype->type == type &&
- (!ptype->dev || ptype->dev == skb->dev)) {
- if (pt_prev) {
- if (!pt_prev->data) {
- ret = deliver_to_old_ones(pt_prev, skb, 0);
- } else {
- atomic_inc(&skb->users);
- ret = pt_prev->func(skb, skb->dev, pt_prev);
- }
- }
- pt_prev = ptype;
- }
- }
- if (pt_prev) {
- if (!pt_prev->data) {
- ret = deliver_to_old_ones(pt_prev, skb, 1);
- } else {
- 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;
- }
- return ret;
- }
- static int process_backlog(struct net_device *blog_dev, int *budget)
- {
- int work = 0;
- int quota = min(blog_dev->quota, *budget);
- int this_cpu = smp_processor_id();
- struct softnet_data *queue = &softnet_data[this_cpu];
- unsigned long start_time = jiffies;
- for (;;) {
- struct sk_buff *skb;
- struct net_device *dev;
- local_irq_disable();
- skb = __skb_dequeue(&queue->input_pkt_queue);
- if (skb == NULL)
- 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;
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- if (queue->throttle && queue->input_pkt_queue.qlen < no_cong_thresh ) {
- if (atomic_dec_and_test(&netdev_dropping)) {
- queue->throttle = 0;
- netdev_wakeup();
- break;
- }
- }
- #endif
- }
- blog_dev->quota -= work;
- *budget -= work;
- return -1;
- job_done:
- blog_dev->quota -= work;
- *budget -= work;
- list_del(&blog_dev->poll_list);
- clear_bit(__LINK_STATE_RX_SCHED, &blog_dev->state);
- if (queue->throttle) {
- queue->throttle = 0;
- #ifdef CONFIG_NET_HW_FLOWCONTROL
- if (atomic_dec_and_test(&netdev_dropping))
- netdev_wakeup();
- #endif
- }
- local_irq_enable();
- return 0;
- }
- static void net_rx_action(struct softirq_action *h)
- {
- int this_cpu = smp_processor_id();
- struct softnet_data *queue = &softnet_data[this_cpu];
- unsigned long start_time = jiffies;
- int budget = netdev_max_backlog;
- br_read_lock(BR_NETPROTO_LOCK);
- 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);
- if (dev->quota <= 0 || dev->poll(dev, &budget)) {
- 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 {
- dev_put(dev);
- local_irq_disable();
- }
- }
- local_irq_enable();
- br_read_unlock(BR_NETPROTO_LOCK);
- return;
- softnet_break:
- netdev_rx_stat[this_cpu].time_squeeze++;
- __cpu_raise_softirq(this_cpu, NET_RX_SOFTIRQ);
- local_irq_enable();
- br_read_unlock(BR_NETPROTO_LOCK);
- }
- 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 *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 *arg)
- {
- struct ifconf ifc;
- struct net_device *dev;
- char *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 != NULL; dev = dev->next) {
- for (i=0; i<NPROTO; i++) {
- if (gifconf_list[i]) {
- int done;
- if (pos==NULL) {
- 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;
- if (copy_to_user(arg, &ifc, sizeof(struct ifconf)))
- return -EFAULT;
- /*
- * Both BSD and Solaris return 0 here, so we do too.
- */
- return 0;
- }
- /*
- * This is invoked by the /proc filesystem handler to display a device
- * in detail.
- */
- #ifdef CONFIG_PROC_FS
- static int sprintf_stats(char *buffer, struct net_device *dev)
- {
- struct net_device_stats *stats = (dev->get_stats ? dev->get_stats(dev): NULL);
- int size;
-
- if (stats)
- size = sprintf(buffer, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu %8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lun",
- 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
- size = sprintf(buffer, "%6s: No statistics available.n", dev->name);
- return size;
- }
- /*
- * Called from the PROCfs module. This now uses the new arbitrary sized /proc/net interface
- * to create /proc/net/dev
- */
-
- static int dev_get_info(char *buffer, char **start, off_t offset, int length)
- {
- int len = 0;
- off_t begin = 0;
- off_t pos = 0;
- int size;
- struct net_device *dev;
- size = sprintf(buffer,
- "Inter-| Receive | Transmitn"
- " face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressedn");
-
- pos += size;
- len += size;
-
- read_lock(&dev_base_lock);
- for (dev = dev_base; dev != NULL; dev = dev->next) {
- size = sprintf_stats(buffer+len, dev);
- len += size;
- pos = begin + len;
-
- if (pos < offset) {
- len = 0;
- begin = pos;
- }
- if (pos > offset + length)
- break;
- }
- read_unlock(&dev_base_lock);
- *start = buffer + (offset - begin); /* Start of wanted data */
- len -= (offset - begin); /* Start slop */
- if (len > length)
- len = length; /* Ending slop */
- if (len < 0)
- len = 0;
- return len;
- }
- static int dev_proc_stats(char *buffer, char **start, off_t offset,
- int length, int *eof, void *data)
- {
- int i, lcpu;
- int len=0;
- for (lcpu=0; lcpu<smp_num_cpus; lcpu++) {
- i = cpu_logical_map(lcpu);
- len += sprintf(buffer+len, "%08x %08x %08x %08x %08x %08x %08x %08x %08xn",
- netdev_rx_stat[i].total,
- netdev_rx_stat[i].dropped,
- netdev_rx_stat[i].time_squeeze,
- netdev_rx_stat[i].throttled,
- netdev_rx_stat[i].fastroute_hit,
- netdev_rx_stat[i].fastroute_success,
- netdev_rx_stat[i].fastroute_defer,
- netdev_rx_stat[i].fastroute_deferred_out,
- #if 0
- netdev_rx_stat[i].fastroute_latency_reduction
- #else
- netdev_rx_stat[i].cpu_collision
- #endif
- );
- }
- len -= offset;
- if (len > length)
- len = length;
- if (len < 0)
- len = 0;
- *start = buffer + offset;
- *eof = 1;
- return len;
- }
- #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);
- }
- br_write_lock_bh(BR_NETPROTO_LOCK);
- slave->master = master;
- br_write_unlock_bh(BR_NETPROTO_LOCK);
- 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;
- dev->flags |= IFF_PROMISC;
- if ((dev->promiscuity += inc) == 0)
- dev->flags &= ~IFF_PROMISC;
- if (dev->flags^old_flags) {
- #ifdef CONFIG_NET_FASTROUTE
- if (dev->flags&IFF_PROMISC) {
- netdev_fastroute_obstacles++;
- dev_clear_fastroute(dev);
- } else
- netdev_fastroute_obstacles--;
- #endif
- dev_mc_upload(dev);
- printk(KERN_INFO "device %s %s promiscuous moden",
- 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);
- }
- 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 == 0)
- 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;
- }
- /*
- * Perform the SIOCxIFxxx calls.
- */
-
- static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
- {
- struct net_device *dev;
- int err;
- if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL)
- return -ENODEV;
- switch(cmd)
- {
- case SIOCGIFFLAGS: /* Get interface flags */
- ifr->ifr_flags = (dev->flags&~(IFF_PROMISC|IFF_ALLMULTI|IFF_RUNNING))
- |(dev->gflags&(IFF_PROMISC|IFF_ALLMULTI));
- if (netif_running(dev) && netif_carrier_ok(dev))
- ifr->ifr_flags |= IFF_RUNNING;
- 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 */
- if (ifr->ifr_mtu == dev->mtu)
- return 0;
- /*
- * MTU must be positive.
- */
-
- if (ifr->ifr_mtu<0)
- return -EINVAL;
- if (!netif_device_present(dev))
- return -ENODEV;
- if (dev->change_mtu)
- err = dev->change_mtu(dev, ifr->ifr_mtu);
- else {
- dev->mtu = ifr->ifr_mtu;
- err = 0;
- }
- if (!err && dev->flags&IFF_UP)
- notifier_call_chain(&netdev_chain, NETDEV_CHANGEMTU, dev);
- return err;
- case SIOCGIFHWADDR:
- memcpy(ifr->ifr_hwaddr.sa_data,dev->dev_addr, MAX_ADDR_LEN);
- ifr->ifr_hwaddr.sa_family=dev->type;
- return 0;
-
- case SIOCSIFHWADDR:
- if (dev->set_mac_address == NULL)
- return -EOPNOTSUPP;
- if (ifr->ifr_hwaddr.sa_family!=dev->type)
- return -EINVAL;
- if (!netif_device_present(dev))
- return -ENODEV;
- err = dev->set_mac_address(dev, &ifr->ifr_hwaddr);
- if (!err)
- notifier_call_chain(&netdev_chain, NETDEV_CHANGEADDR, dev);
- return err;
-
- case SIOCSIFHWBROADCAST:
- if (ifr->ifr_hwaddr.sa_family!=dev->type)
- return -EINVAL;
- memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, MAX_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 == NULL ||
- ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
- return -EINVAL;
- if (!netif_device_present(dev))
- return -ENODEV;
- dev_mc_add(dev,ifr->ifr_hwaddr.sa_data, dev->addr_len, 1);
- return 0;
- case SIOCDELMULTI:
- if (dev->set_multicast_list == NULL ||
- ifr->ifr_hwaddr.sa_family!=AF_UNSPEC)
- return -EINVAL;
- if (!netif_device_present(dev))
- return -ENODEV;
- dev_mc_delete(dev,ifr->ifr_hwaddr.sa_data,dev->addr_len, 1);
- return 0;
- 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:
- if (dev->flags&IFF_UP)
- return -EBUSY;
- if (__dev_get_by_name(ifr->ifr_newname))
- return -EEXIST;
- memcpy(dev->name, ifr->ifr_newname, IFNAMSIZ);
- dev->name[IFNAMSIZ-1] = 0;
- notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev);
- return 0;
- /*
- * Unknown or private ioctl
- */
- default:
- if ((cmd >= SIOCDEVPRIVATE &&
- cmd <= SIOCDEVPRIVATE + 15) ||
- cmd == SIOCBONDENSLAVE ||
- cmd == SIOCBONDRELEASE ||
- cmd == SIOCBONDSETHWADDR ||
- cmd == SIOCBONDSLAVEINFOQUERY ||
- cmd == SIOCBONDINFOQUERY ||
- cmd == SIOCBONDCHANGEACTIVE ||
- cmd == SIOCETHTOOL ||
- cmd == SIOCGMIIPHY ||
- cmd == SIOCGMIIREG ||
- cmd == SIOCSMIIREG) {
- if (dev->do_ioctl) {
- if (!netif_device_present(dev))
- return -ENODEV;
- return dev->do_ioctl(dev, ifr, cmd);
- }
- return -EOPNOTSUPP;
- }
- }
- return -EINVAL;
- }
- /*
- * 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 *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 *) arg);
- rtnl_shunlock();
- return ret;
- }
- if (cmd == SIOCGIFNAME) {
- return dev_ifname((struct ifreq *)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)))
- return -EFAULT;
- }
- return ret;
- /*
- * These ioctl calls:
- * - require superuser power.
- * - require strict serialization.
- * - return a value
- */
-
- case SIOCETHTOOL:
- case SIOCGMIIPHY:
- case SIOCGMIIREG:
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- dev_load(ifr.ifr_name);
- dev_probe_lock();
- rtnl_lock();
- ret = dev_ifsioc(&ifr, cmd);
- rtnl_unlock();
- dev_probe_unlock();
- if (!ret) {
- if (colon)
- *colon = ':';
- if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
- return -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 SIOCSIFNAME:
- case SIOCSMIIREG:
- case SIOCBONDENSLAVE:
- case SIOCBONDRELEASE:
- case SIOCBONDSETHWADDR:
- case SIOCBONDSLAVEINFOQUERY:
- case SIOCBONDINFOQUERY:
- case SIOCBONDCHANGEACTIVE:
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- dev_load(ifr.ifr_name);
- dev_probe_lock();
- rtnl_lock();
- ret = dev_ifsioc(&ifr, cmd);
- rtnl_unlock();
- dev_probe_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 >= SIOCDEVPRIVATE &&
- cmd <= SIOCDEVPRIVATE + 15) {
- dev_load(ifr.ifr_name);
- dev_probe_lock();
- rtnl_lock();
- ret = dev_ifsioc(&ifr, cmd);
- rtnl_unlock();
- dev_probe_unlock();
- if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
- return -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 (!ret && IW_IS_GET(cmd) &&
- copy_to_user(arg, &ifr, sizeof(struct ifreq)))
- return -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.
- */
-
- int dev_new_index(void)
- {
- static int ifindex;
- for (;;) {
- if (++ifindex <= 0)
- ifindex=1;
- if (__dev_get_by_index(ifindex) == NULL)
- return ifindex;
- }
- }
- static int dev_boot_phase = 1;
- /**
- * 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. See the comment at the
- * end of Space.c for details about the locking. 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 net_dev_init(void);
- int register_netdevice(struct net_device *dev)
- {
- struct net_device *d, **dp;
- #ifdef CONFIG_NET_DIVERT
- int ret;
- #endif
- spin_lock_init(&dev->queue_lock);
- spin_lock_init(&dev->xmit_lock);
- dev->xmit_lock_owner = -1;
- #ifdef CONFIG_NET_FASTROUTE
- dev->fastpath_lock=RW_LOCK_UNLOCKED;
- #endif
- if (dev_boot_phase)
- net_dev_init();
- #ifdef CONFIG_NET_DIVERT
- ret = alloc_divert_blk(dev);
- if (ret)
- return ret;
- #endif /* CONFIG_NET_DIVERT */
-
- dev->iflink = -1;
- /* Init, if this function is available */
- if (dev->init && dev->init(dev) != 0) {
- #ifdef CONFIG_NET_DIVERT
- free_divert_blk(dev);
- #endif
- return -EIO;
- }
- dev->ifindex = dev_new_index();
- if (dev->iflink == -1)
- dev->iflink = dev->ifindex;
- /* Check for existence, and append to tail of chain */
- for (dp=&dev_base; (d=*dp) != NULL; dp=&d->next) {
- if (d == dev || strcmp(d->name, dev->name) == 0) {
- #ifdef CONFIG_NET_DIVERT
- free_divert_blk(dev);
- #endif
- return -EEXIST;
- }
- }
- /*
- * nil rebuild_header routine,
- * that should be never called and used as just bug trap.
- */
- if (dev->rebuild_header == NULL)
- 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);
- *dp = dev;
- dev_hold(dev);
- dev->deadbeaf = 0;
- write_unlock_bh(&dev_base_lock);
- /* Notify protocols, that a new device appeared. */
- notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
- net_run_sbin_hotplug(dev, "register");
- return 0;
- }
- /**
- * netdev_finish_unregister - complete unregistration
- * @dev: device
- *
- * Destroy and free a dead device. A value of zero is returned on
- * success.
- */
-
- int netdev_finish_unregister(struct net_device *dev)
- {
- BUG_TRAP(dev->ip_ptr==NULL);
- BUG_TRAP(dev->ip6_ptr==NULL);
- BUG_TRAP(dev->dn_ptr==NULL);
- if (!dev->deadbeaf) {
- printk(KERN_ERR "Freeing alive device %p, %sn", dev, dev->name);
- return 0;
- }
- #ifdef NET_REFCNT_DEBUG
- printk(KERN_DEBUG "netdev_finish_unregister: %s%s.n", dev->name,
- (dev->features & NETIF_F_DYNALLOC)?"":", old style");
- #endif
- if (dev->destructor)
- dev->destructor(dev);
- if (dev->features & NETIF_F_DYNALLOC)
- kfree(dev);
- return 0;
- }
- /**
- * 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. See the comment at the
- * end of Space.c for details about the locking. You may want
- * unregister_netdev() instead of this.
- */
- int unregister_netdevice(struct net_device *dev)
- {
- unsigned long now, warning_time;
- struct net_device *d, **dp;
- /* If device is running, close it first. */
- if (dev->flags & IFF_UP)
- dev_close(dev);
- BUG_TRAP(dev->deadbeaf==0);
- dev->deadbeaf = 1;
- /* 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);
- *dp = d->next;
- write_unlock_bh(&dev_base_lock);
- break;
- }
- }
- if (d == NULL) {
- printk(KERN_DEBUG "unregister_netdevice: device %s/%p never was registeredn", dev->name, dev);
- return -ENODEV;
- }
- /* Synchronize to net_rx_action. */
- br_write_lock_bh(BR_NETPROTO_LOCK);
- br_write_unlock_bh(BR_NETPROTO_LOCK);
- if (dev_boot_phase == 0) {
- #ifdef CONFIG_NET_FASTROUTE
- dev_clear_fastroute(dev);
- #endif
- /* Shutdown queueing discipline. */
- dev_shutdown(dev);
- net_run_sbin_hotplug(dev, "unregister");
- /* 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==NULL);
- #ifdef CONFIG_NET_DIVERT
- free_divert_blk(dev);
- #endif
- if (dev->features & NETIF_F_DYNALLOC) {
- #ifdef NET_REFCNT_DEBUG
- if (atomic_read(&dev->refcnt) != 1)
- printk(KERN_DEBUG "unregister_netdevice: holding %s refcnt=%dn", dev->name, atomic_read(&dev->refcnt)-1);
- #endif
- dev_put(dev);
- return 0;
- }
- /* Last reference is our one */
- if (atomic_read(&dev->refcnt) == 1) {
- dev_put(dev);
- return 0;
- }
- #ifdef NET_REFCNT_DEBUG
- printk("unregister_netdevice: waiting %s refcnt=%dn", dev->name, atomic_read(&dev->refcnt));
- #endif
- /* EXPLANATION. If dev->refcnt is not now 1 (our own reference)
- it means that someone in the kernel still has a reference
- to this device and we cannot release it.
- "New style" devices have destructors, hence we can return from this
- function and destructor will do all the work later. As of kernel 2.4.0
- there are very few "New Style" devices.
- "Old style" devices expect that the device is free of any references
- upon exit from this function.
- We cannot return from this function until all such references have
- fallen away. This is because the caller of this function will probably
- immediately kfree(*dev) and then be unloaded via sys_delete_module.
- So, we linger until all references fall away. The duration of the
- linger is basically unbounded! It is driven by, for example, the
- current setting of sysctl_ipfrag_time.
- After 1 second, we start to rebroadcast unregister notifications
- in hope that careless clients will release the device.
- */
- now = warning_time = jiffies;
- while (atomic_read(&dev->refcnt) != 1) {
- if ((jiffies - now) > 1*HZ) {
- /* Rebroadcast unregister notification */
- notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
- }
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(HZ/4);
- current->state = TASK_RUNNING;
- if ((jiffies - warning_time) > 10*HZ) {
- printk(KERN_EMERG "unregister_netdevice: waiting for %s to "
- "become free. Usage count = %dn",
- dev->name, atomic_read(&dev->refcnt));
- warning_time = jiffies;
- }
- }
- dev_put(dev);
- return 0;
- }
- /*
- * 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.
- *
- */
- extern void net_device_init(void);
- extern void ip_auto_config(void);
- struct proc_dir_entry *proc_net_drivers;
- #ifdef CONFIG_NET_DIVERT
- extern void dv_init(void);
- #endif /* CONFIG_NET_DIVERT */
- /*
- * Callers must hold the rtnl semaphore. See the comment at the
- * end of Space.c for details about the locking.
- */
- int __init net_dev_init(void)
- {
- struct net_device *dev, **dp;
- int i;
- if (!dev_boot_phase)
- return 0;
- #ifdef CONFIG_NET_DIVERT
- dv_init();
- #endif /* CONFIG_NET_DIVERT */
-
- /*
- * Initialise the packet receive queues.
- */
- for (i = 0; i < NR_CPUS; i++) {
- struct softnet_data *queue;
- queue = &softnet_data[i];
- skb_queue_head_init(&queue->input_pkt_queue);
- queue->throttle = 0;
- queue->cng_level = 0;
- queue->avg_blog = 10; /* arbitrary non-zero */
- queue->completion_queue = NULL;
- INIT_LIST_HEAD(&queue->poll_list);
- set_bit(__LINK_STATE_START, &queue->blog_dev.state);
- queue->blog_dev.weight = weight_p;
- queue->blog_dev.poll = process_backlog;
- atomic_set(&queue->blog_dev.refcnt, 1);
- }
- #ifdef CONFIG_NET_PROFILE
- net_profile_init();
- NET_PROFILE_REGISTER(dev_queue_xmit);
- NET_PROFILE_REGISTER(softnet_process);
- #endif
- #ifdef OFFLINE_SAMPLE
- samp_timer.expires = jiffies + (10 * HZ);
- add_timer(&samp_timer);
- #endif
- /*
- * Add the devices.
- * If the call to dev->init fails, the dev is removed
- * from the chain disconnecting the device until the
- * next reboot.
- *
- * NB At boot phase networking is dead. No locking is required.
- * But we still preserve dev_base_lock for sanity.
- */
- dp = &dev_base;
- while ((dev = *dp) != NULL) {
- spin_lock_init(&dev->queue_lock);
- spin_lock_init(&dev->xmit_lock);
- #ifdef CONFIG_NET_FASTROUTE
- dev->fastpath_lock = RW_LOCK_UNLOCKED;
- #endif
- dev->xmit_lock_owner = -1;
- dev->iflink = -1;
- dev_hold(dev);
- /*
- * Allocate name. If the init() fails
- * the name will be reissued correctly.
- */
- if (strchr(dev->name, '%'))
- dev_alloc_name(dev, dev->name);
- /*
- * Check boot time settings for the device.
- */
- netdev_boot_setup_check(dev);
- if (dev->init && dev->init(dev)) {
- /*
- * It failed to come up. It will be unhooked later.
- * dev_alloc_name can now advance to next suitable
- * name that is checked next.
- */
- dev->deadbeaf = 1;
- dp = &dev->next;
- } else {
- dp = &dev->next;
- dev->ifindex = dev_new_index();
- if (dev->iflink == -1)
- dev->iflink = dev->ifindex;
- if (dev->rebuild_header == NULL)
- dev->rebuild_header = default_rebuild_header;
- dev_init_scheduler(dev);
- set_bit(__LINK_STATE_PRESENT, &dev->state);
- }
- }
- /*
- * Unhook devices that failed to come up
- */
- dp = &dev_base;
- while ((dev = *dp) != NULL) {
- if (dev->deadbeaf) {
- write_lock_bh(&dev_base_lock);
- *dp = dev->next;
- write_unlock_bh(&dev_base_lock);
- dev_put(dev);
- } else {
- dp = &dev->next;
- }
- }
- #ifdef CONFIG_PROC_FS
- proc_net_create("dev", 0, dev_get_info);
- create_proc_read_entry("net/softnet_stat", 0, 0, dev_proc_stats, NULL);
- proc_net_drivers = proc_mkdir("net/drivers", 0);
- #ifdef WIRELESS_EXT
- /* Available in net/core/wireless.c */
- proc_net_create("wireless", 0, dev_get_wireless_info);
- #endif /* WIRELESS_EXT */
- #endif /* CONFIG_PROC_FS */
- dev_boot_phase = 0;
- open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
- open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
- dst_init();
- dev_mcast_init();
- #ifdef CONFIG_NET_SCHED
- pktsched_init();
- #endif
- /*
- * Initialise network devices
- */
-
- net_device_init();
- return 0;
- }
- #ifdef CONFIG_HOTPLUG
- /* Notify userspace when a netdevice event occurs,
- * by running '/sbin/hotplug net' with certain
- * environment variables set.
- */
- static int net_run_sbin_hotplug(struct net_device *dev, char *action)
- {
- char *argv[3], *envp[5], ifname[12 + IFNAMSIZ], action_str[32];
- int i;
- sprintf(ifname, "INTERFACE=%s", dev->name);
- sprintf(action_str, "ACTION=%s", action);
- i = 0;
- argv[i++] = hotplug_path;
- argv[i++] = "net";
- argv[i] = 0;
- i = 0;
- /* minimal command environment */
- envp [i++] = "HOME=/";
- envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
- envp [i++] = ifname;
- envp [i++] = action_str;
- envp [i] = 0;
-
- return call_usermodehelper(argv [0], argv, envp);
- }
- #endif