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authorBart De Schuymer <bdschuym@pandora.be>2002-06-02 18:39:17 +0000
committerBart De Schuymer <bdschuym@pandora.be>2002-06-02 18:39:17 +0000
commit657ba9acc2d3a5700d534802c54755221187f7af (patch)
tree2d8815f52aa4918cc75ae75c9e2fc2fc688f0a5b /kernel/linux/net/core/dev.c
parent653706851ef5741b89078bc78ee223c29554a3ca (diff)
forgot this one
Diffstat (limited to 'kernel/linux/net/core/dev.c')
-rw-r--r--kernel/linux/net/core/dev.c2922
1 files changed, 2922 insertions, 0 deletions
diff --git a/kernel/linux/net/core/dev.c b/kernel/linux/net/core/dev.c
new file mode 100644
index 0000000..4702613
--- /dev/null
+++ b/kernel/linux/net/core/dev.c
@@ -0,0 +1,2922 @@
+/*
+ * 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 <dhinds@allegro.stanford.edu>
+ * 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 */
+#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] == '\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] != '\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 existance.
+
+ 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)) {
+ if (dev->open) {
+ ret = dev->open(dev);
+ if (ret != 0 && 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;
+
+ set_bit(__LINK_STATE_START, &dev->state);
+
+ /*
+ * 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);
+
+ /*
+ * 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_DEBUG "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);
+ }
+ }
+ 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_DEBUG "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_DEBUG "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;
+/* 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);
+ /* Runs from irqs or BH's, no need to wake BH */
+ cpu_raise_softirq(this_cpu, NET_RX_SOFTIRQ);
+ local_irq_restore(flags);
+#ifndef OFFLINE_SAMPLE
+ get_sample_stats(this_cpu);
+#endif
+ return softnet_data[this_cpu].cng_level;
+ }
+
+ if (queue->throttle) {
+ queue->throttle = 0;
+#ifdef CONFIG_NET_HW_FLOWCONTROL
+ if (atomic_dec_and_test(&netdev_dropping))
+ netdev_wakeup();
+#endif
+ }
+ 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;
+}
+
+/* Reparent skb to master device. This function is called
+ * only from net_rx_action under BR_NETPROTO_LOCK. It is misuse
+ * of BR_NETPROTO_LOCK, but it is OK for now.
+ */
+static __inline__ void skb_bond(struct sk_buff *skb)
+{
+ struct net_device *dev = skb->dev;
+
+ if (dev->master) {
+ dev_hold(dev->master);
+ skb->dev = dev->master;
+ dev_put(dev);
+ }
+}
+
+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);
+ }
+ }
+ }
+}
+
+/**
+ * net_call_rx_atomic
+ * @fn: function to call
+ *
+ * Make a function call that is atomic with respect to the protocol
+ * layers.
+ */
+
+void net_call_rx_atomic(void (*fn)(void))
+{
+ br_write_lock_bh(BR_NETPROTO_LOCK);
+ fn();
+ br_write_unlock_bh(BR_NETPROTO_LOCK);
+}
+
+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
+int (*br_handle_frame_hook)(struct sk_buff *skb) = NULL;
+#if defined(CONFIG_BRIDGE_EBT_BROUTE) || \
+ defined(CONFIG_BRIDGE_EBT_BROUTE_MODULE)
+unsigned int (*broute_decision) (unsigned int hook, struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *)) = NULL;
+#endif
+#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)
+ deliver_to_old_ones(pt_prev, skb, 0);
+ else {
+ atomic_inc(&skb->users);
+ pt_prev->func(skb, skb->dev, pt_prev);
+ }
+ }
+
+ ret = br_handle_frame_hook(skb);
+ return ret;
+}
+
+
+#ifdef CONFIG_NET_DIVERT
+static inline void 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);
+}
+#endif /* CONFIG_NET_DIVERT */
+
+
+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 bugdet = netdev_max_backlog;
+
+ br_read_lock(BR_NETPROTO_LOCK);
+
+ for (;;) {
+ struct sk_buff *skb;
+ struct net_device *rx_dev;
+
+ local_irq_disable();
+ skb = __skb_dequeue(&queue->input_pkt_queue);
+ local_irq_enable();
+
+ if (skb == NULL)
+ break;
+
+ skb_bond(skb);
+
+ rx_dev = skb->dev;
+
+#ifdef CONFIG_NET_FASTROUTE
+ if (skb->pkt_type == PACKET_FASTROUTE) {
+ netdev_rx_stat[this_cpu].fastroute_deferred_out++;
+ dev_queue_xmit(skb);
+ dev_put(rx_dev);
+ continue;
+ }
+#endif
+ skb->h.raw = skb->nh.raw = skb->data;
+ {
+ struct packet_type *ptype, *pt_prev;
+ unsigned short type = skb->protocol;
+
+ 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) {
+ deliver_to_old_ones(pt_prev, skb, 0);
+ } else {
+ atomic_inc(&skb->users);
+ pt_prev->func(skb,
+ skb->dev,
+ pt_prev);
+ }
+ }
+ pt_prev = ptype;
+ }
+ }
+
+#ifdef CONFIG_NET_DIVERT
+ if (skb->dev->divert && skb->dev->divert->divert)
+ 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) {
+ if (handle_bridge(skb, pt_prev) == 0) {
+ dev_put(rx_dev);
+ continue;
+ }
+ }
+#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)
+ deliver_to_old_ones(pt_prev, skb, 0);
+ else {
+ atomic_inc(&skb->users);
+ pt_prev->func(skb,
+ skb->dev,
+ pt_prev);
+ }
+ }
+ pt_prev = ptype;
+ }
+ }
+
+ if (pt_prev) {
+ if (!pt_prev->data)
+ deliver_to_old_ones(pt_prev, skb, 1);
+ else
+ pt_prev->func(skb, skb->dev, pt_prev);
+ } else
+ kfree_skb(skb);
+ }
+
+ dev_put(rx_dev);
+
+ if (bugdet-- < 0 || jiffies - start_time > 1)
+ goto softnet_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();
+ goto softnet_break;
+ }
+ }
+#endif
+
+ }
+ br_read_unlock(BR_NETPROTO_LOCK);
+
+ local_irq_disable();
+ if (queue->throttle) {
+ queue->throttle = 0;
+#ifdef CONFIG_NET_HW_FLOWCONTROL
+ if (atomic_dec_and_test(&netdev_dropping))
+ netdev_wakeup();
+#endif
+ }
+ local_irq_enable();
+
+ NET_PROFILE_LEAVE(softnet_process);
+ return;
+
+softnet_break:
+ br_read_unlock(BR_NETPROTO_LOCK);
+
+ local_irq_disable();
+ netdev_rx_stat[this_cpu].time_squeeze++;
+ /* This already runs in BH context, no need to wake up BH's */
+ cpu_raise_softirq(this_cpu, NET_RX_SOFTIRQ);
+ local_irq_enable();
+
+ NET_PROFILE_LEAVE(softnet_process);
+ return;
+}
+
+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 %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
+ 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 | Transmit\n"
+ " face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed\n");
+
+ 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 %08x\n",
+ 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 */
+
+
+#ifdef WIRELESS_EXT
+#ifdef CONFIG_PROC_FS
+
+/*
+ * Print one entry of /proc/net/wireless
+ * This is a clone of /proc/net/dev (just above)
+ */
+static int sprintf_wireless_stats(char *buffer, struct net_device *dev)
+{
+ /* Get stats from the driver */
+ struct iw_statistics *stats = (dev->get_wireless_stats ?
+ dev->get_wireless_stats(dev) :
+ (struct iw_statistics *) NULL);
+ int size;
+
+ if (stats != (struct iw_statistics *) NULL) {
+ size = sprintf(buffer,
+ "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d %6d %6d %6d\n",
+ dev->name,
+ stats->status,
+ stats->qual.qual,
+ stats->qual.updated & 1 ? '.' : ' ',
+ stats->qual.level,
+ stats->qual.updated & 2 ? '.' : ' ',
+ stats->qual.noise,
+ stats->qual.updated & 4 ? '.' : ' ',
+ stats->discard.nwid,
+ stats->discard.code,
+ stats->discard.fragment,
+ stats->discard.retries,
+ stats->discard.misc,
+ stats->miss.beacon);
+ stats->qual.updated = 0;
+ }
+ else
+ size = 0;
+
+ return size;
+}
+
+/*
+ * Print info for /proc/net/wireless (print all entries)
+ * This is a clone of /proc/net/dev (just above)
+ */
+static int dev_get_wireless_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-| sta-| Quality | Discarded packets | Missed\n"
+ " face | tus | link level noise | nwid crypt frag retry misc | beacon\n"
+ );
+
+ pos += size;
+ len += size;
+
+ read_lock(&dev_base_lock);
+ for (dev = dev_base; dev != NULL; dev = dev->next) {
+ size = sprintf_wireless_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;
+}
+#endif /* CONFIG_PROC_FS */
+
+/*
+ * Allow programatic access to /proc/net/wireless even if /proc
+ * doesn't exist... Also more efficient...
+ */
+static inline int dev_iwstats(struct net_device *dev, struct ifreq *ifr)
+{
+ /* Get stats from the driver */
+ struct iw_statistics *stats = (dev->get_wireless_stats ?
+ dev->get_wireless_stats(dev) :
+ (struct iw_statistics *) NULL);
+
+ if (stats != (struct iw_statistics *) NULL) {
+ struct iwreq * wrq = (struct iwreq *)ifr;
+
+ /* Copy statistics to the user buffer */
+ if(copy_to_user(wrq->u.data.pointer, stats,
+ sizeof(struct iw_statistics)))
+ return -EFAULT;
+
+ /* Check if we need to clear the update flag */
+ if(wrq->u.data.flags != 0)
+ stats->qual.updated = 0;
+ return(0);
+ } else
+ return -EOPNOTSUPP;
+}
+#endif /* WIRELESS_EXT */
+
+/**
+ * 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 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);
+}
+
+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;
+
+#ifdef WIRELESS_EXT
+ case SIOCGIWSTATS:
+ return dev_iwstats(dev, ifr);
+#endif /* WIRELESS_EXT */
+
+ /*
+ * 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;
+ }
+
+#ifdef WIRELESS_EXT
+ if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
+ if (dev->do_ioctl) {
+ if (!netif_device_present(dev))
+ return -ENODEV;
+ return dev->do_ioctl(dev, ifr, cmd);
+ }
+ return -EOPNOTSUPP;
+ }
+#endif /* WIRELESS_EXT */
+
+ }
+ 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();
+ ret = dev_ifsioc(&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, %s\n", 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 registered\n", 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=%d\n", 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=%d\n", 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 = %d\n",
+ 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);
+#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;
+ }
+
+#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);
+#ifdef WIRELESS_EXT
+ 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