+++ /dev/null
-/*
- * 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
- * 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 <linux/bitops.h>
-#include <linux/capability.h>
-#include <linux/config.h>
-#include <linux/cpu.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/mutex.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 <net/sock.h>
-#include <linux/rtnetlink.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.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/checksum.h>
-#include <linux/highmem.h>
-#include <linux/init.h>
-#include <linux/kmod.h>
-#include <linux/module.h>
-#include <linux/kallsyms.h>
-#include <linux/netpoll.h>
-#include <linux/rcupdate.h>
-#include <linux/delay.h>
-#include <linux/wireless.h>
-#include <net/iw_handler.h>
-#include <asm/current.h>
-#include <linux/audit.h>
-#include <linux/err.h>
-
-#ifdef CONFIG_XEN
-#include <net/ip.h>
-#include <linux/tcp.h>
-#include <linux/udp.h>
-#endif
-
-/*
- * 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 adversely 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 DEFINE_SPINLOCK(ptype_lock);
-static struct list_head ptype_base[16]; /* 16 way hashed list */
-static struct list_head ptype_all; /* Taps */
-
-/*
- * The @dev_base list is protected by @dev_base_lock and the rtnl
- * semaphore.
- *
- * Pure readers hold dev_base_lock for reading.
- *
- * Writers must hold the rtnl semaphore while they loop through the
- * dev_base list, and hold dev_base_lock for writing when they do the
- * actual updates. This allows pure readers to access the list even
- * while a writer is preparing to update it.
- *
- * To put it another way, dev_base_lock is held for writing only to
- * protect against pure readers; the rtnl semaphore provides the
- * protection against other writers.
- *
- * See, for example usages, register_netdevice() and
- * unregister_netdevice(), which must be called with the rtnl
- * semaphore held.
- */
-struct net_device *dev_base;
-static struct net_device **dev_tail = &dev_base;
-DEFINE_RWLOCK(dev_base_lock);
-
-EXPORT_SYMBOL(dev_base);
-EXPORT_SYMBOL(dev_base_lock);
-
-#define NETDEV_HASHBITS 8
-static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS];
-static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS];
-
-static inline struct hlist_head *dev_name_hash(const char *name)
-{
- unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
- return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)];
-}
-
-static inline struct hlist_head *dev_index_hash(int ifindex)
-{
- return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)];
-}
-
-/*
- * Our notifier list
- */
-
-static RAW_NOTIFIER_HEAD(netdev_chain);
-
-/*
- * Device drivers call our routines to queue packets here. We empty the
- * queue in the local softnet handler.
- */
-DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL };
-
-#ifdef CONFIG_SYSFS
-extern int netdev_sysfs_init(void);
-extern int netdev_register_sysfs(struct net_device *);
-extern void netdev_unregister_sysfs(struct net_device *);
-#else
-#define netdev_sysfs_init() (0)
-#define netdev_register_sysfs(dev) (0)
-#define netdev_unregister_sysfs(dev) do { } while(0)
-#endif
-
-
-/*******************************************************************************
-
- Protocol management and registration routines
-
-*******************************************************************************/
-
-/*
- * For efficiency
- */
-
-int netdev_nit;
-
-/*
- * 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 promiscuous ptype_all chain in net_bh.
- * It is true now, do not change it.
- * Explanation 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.
- *
- * This call does not sleep therefore it can not
- * guarantee all CPU's that are in middle of receiving packets
- * will see the new packet type (until the next received packet).
- */
-
-void dev_add_pack(struct packet_type *pt)
-{
- int hash;
-
- spin_lock_bh(&ptype_lock);
- if (pt->type == htons(ETH_P_ALL)) {
- netdev_nit++;
- list_add_rcu(&pt->list, &ptype_all);
- } else {
- hash = ntohs(pt->type) & 15;
- list_add_rcu(&pt->list, &ptype_base[hash]);
- }
- spin_unlock_bh(&ptype_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.
- *
- * The packet type might still be in use by receivers
- * and must not be freed until after all the CPU's have gone
- * through a quiescent state.
- */
-void __dev_remove_pack(struct packet_type *pt)
-{
- struct list_head *head;
- struct packet_type *pt1;
-
- spin_lock_bh(&ptype_lock);
-
- if (pt->type == htons(ETH_P_ALL)) {
- netdev_nit--;
- head = &ptype_all;
- } else
- head = &ptype_base[ntohs(pt->type) & 15];
-
- list_for_each_entry(pt1, head, list) {
- if (pt == pt1) {
- list_del_rcu(&pt->list);
- goto out;
- }
- }
-
- printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
-out:
- spin_unlock_bh(&ptype_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.
- *
- * This call sleeps to guarantee that no CPU is looking at the packet
- * type after return.
- */
-void dev_remove_pack(struct packet_type *pt)
-{
- __dev_remove_pack(pt);
-
- synchronize_net();
-}
-
-/******************************************************************************
-
- Device Boot-time Settings Routines
-
-*******************************************************************************/
-
-/* Boot time configuration table */
-static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
-
-/**
- * netdev_boot_setup_add - add new setup entry
- * @name: name of the device
- * @map: configured settings for the device
- *
- * Adds new setup entry to the dev_boot_setup list. The function
- * returns 0 on error and 1 on success. This is a generic routine to
- * all netdevices.
- */
-static int netdev_boot_setup_add(char *name, struct ifmap *map)
-{
- struct netdev_boot_setup *s;
- int i;
-
- s = dev_boot_setup;
- for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
- if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
- memset(s[i].name, 0, sizeof(s[i].name));
- strcpy(s[i].name, name);
- memcpy(&s[i].map, map, sizeof(s[i].map));
- break;
- }
- }
-
- return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
-}
-
-/**
- * netdev_boot_setup_check - check boot time settings
- * @dev: the netdevice
- *
- * Check boot time settings for the device.
- * The found settings are set for the device to be used
- * later in the device probing.
- * Returns 0 if no settings found, 1 if they are.
- */
-int netdev_boot_setup_check(struct net_device *dev)
-{
- struct netdev_boot_setup *s = dev_boot_setup;
- int i;
-
- for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
- if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
- !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;
-}
-
-
-/**
- * netdev_boot_base - get address from boot time settings
- * @prefix: prefix for network device
- * @unit: id for network device
- *
- * Check boot time settings for the base address of device.
- * The found settings are set for the device to be used
- * later in the device probing.
- * Returns 0 if no settings found.
- */
-unsigned long netdev_boot_base(const char *prefix, int unit)
-{
- const struct netdev_boot_setup *s = dev_boot_setup;
- char name[IFNAMSIZ];
- int i;
-
- sprintf(name, "%s%d", prefix, unit);
-
- /*
- * If device already registered then return base of 1
- * to indicate not to probe for this interface
- */
- if (__dev_get_by_name(name))
- return 1;
-
- for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
- if (!strcmp(name, s[i].name))
- return s[i].map.base_addr;
- return 0;
-}
-
-/*
- * Saves at boot time configured settings for any netdevice.
- */
-int __init netdev_boot_setup(char *str)
-{
- int ints[5];
- struct ifmap map;
-
- str = get_options(str, ARRAY_SIZE(ints), ints);
- if (!str || !*str)
- return 0;
-
- /* Save settings */
- memset(&map, 0, sizeof(map));
- if (ints[0] > 0)
- map.irq = ints[1];
- if (ints[0] > 1)
- map.base_addr = ints[2];
- if (ints[0] > 2)
- map.mem_start = ints[3];
- if (ints[0] > 3)
- map.mem_end = ints[4];
-
- /* Add new entry to the list */
- return netdev_boot_setup_add(str, &map);
-}
-
-__setup("netdev=", netdev_boot_setup);
-
-/*******************************************************************************
-
- Device Interface Subroutines
-
-*******************************************************************************/
-
-/**
- * __dev_get_by_name - find a device by its name
- * @name: name to find
- *
- * Find an interface by name. Must be called under RTNL semaphore
- * or @dev_base_lock. If the name is found a pointer to the device
- * is returned. If the name is not found then %NULL is returned. The
- * reference counters are not incremented so the caller must be
- * careful with locks.
- */
-
-struct net_device *__dev_get_by_name(const char *name)
-{
- struct hlist_node *p;
-
- hlist_for_each(p, dev_name_hash(name)) {
- struct net_device *dev
- = hlist_entry(p, struct net_device, name_hlist);
- if (!strncmp(dev->name, name, IFNAMSIZ))
- return dev;
- }
- return NULL;
-}
-
-/**
- * dev_get_by_name - find a device by its name
- * @name: name to find
- *
- * Find an interface by name. This can be called from any
- * context and does its own locking. The returned handle has
- * the usage count incremented and the caller must use dev_put() to
- * release it when it is no longer needed. %NULL is returned if no
- * matching device is found.
- */
-
-struct net_device *dev_get_by_name(const char *name)
-{
- struct net_device *dev;
-
- read_lock(&dev_base_lock);
- dev = __dev_get_by_name(name);
- if (dev)
- dev_hold(dev);
- read_unlock(&dev_base_lock);
- return dev;
-}
-
-/**
- * __dev_get_by_index - find a device by its ifindex
- * @ifindex: index of device
- *
- * Search for an interface by index. Returns %NULL if the device
- * is not found or a pointer to the device. The device has not
- * had its reference counter increased so the caller must be careful
- * about locking. The caller must hold either the RTNL semaphore
- * or @dev_base_lock.
- */
-
-struct net_device *__dev_get_by_index(int ifindex)
-{
- struct hlist_node *p;
-
- hlist_for_each(p, dev_index_hash(ifindex)) {
- struct net_device *dev
- = hlist_entry(p, struct net_device, index_hlist);
- if (dev->ifindex == ifindex)
- return dev;
- }
- return NULL;
-}
-
-
-/**
- * dev_get_by_index - find a device by its ifindex
- * @ifindex: index of device
- *
- * Search for an interface by index. Returns NULL if the device
- * is not found or a pointer to the device. The device returned has
- * had a reference added and the pointer is safe until the user calls
- * dev_put to indicate they have finished with it.
- */
-
-struct net_device *dev_get_by_index(int ifindex)
-{
- struct net_device *dev;
-
- read_lock(&dev_base_lock);
- dev = __dev_get_by_index(ifindex);
- if (dev)
- dev_hold(dev);
- read_unlock(&dev_base_lock);
- return dev;
-}
-
-/**
- * dev_getbyhwaddr - find a device by its hardware address
- * @type: media type of device
- * @ha: hardware address
- *
- * Search for an interface by MAC address. Returns NULL if the device
- * is not found or a pointer to the device. The caller must hold the
- * rtnl semaphore. The returned device has not had its ref count increased
- * and the caller must therefore be careful about locking
- *
- * BUGS:
- * If the API was consistent this would be __dev_get_by_hwaddr
- */
-
-struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
-{
- struct net_device *dev;
-
- ASSERT_RTNL();
-
- for (dev = dev_base; dev; dev = dev->next)
- if (dev->type == type &&
- !memcmp(dev->dev_addr, ha, dev->addr_len))
- break;
- return dev;
-}
-
-EXPORT_SYMBOL(dev_getbyhwaddr);
-
-struct net_device *dev_getfirstbyhwtype(unsigned short type)
-{
- struct net_device *dev;
-
- rtnl_lock();
- for (dev = dev_base; dev; dev = dev->next) {
- if (dev->type == type) {
- dev_hold(dev);
- break;
- }
- }
- rtnl_unlock();
- return dev;
-}
-
-EXPORT_SYMBOL(dev_getfirstbyhwtype);
-
-/**
- * dev_get_by_flags - find any device with given flags
- * @if_flags: IFF_* values
- * @mask: bitmask of bits in if_flags to check
- *
- * Search for any interface with the given flags. Returns NULL if a device
- * is not found or a pointer to the device. The device returned has
- * had a reference added and the pointer is safe until the user calls
- * dev_put to indicate they have finished with it.
- */
-
-struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask)
-{
- struct net_device *dev;
-
- read_lock(&dev_base_lock);
- for (dev = dev_base; dev != NULL; dev = dev->next) {
- if (((dev->flags ^ if_flags) & mask) == 0) {
- dev_hold(dev);
- break;
- }
- }
- read_unlock(&dev_base_lock);
- return dev;
-}
-
-/**
- * dev_valid_name - check if name is okay for network device
- * @name: name string
- *
- * Network device names need to be valid file names to
- * to allow sysfs to work
- */
-int dev_valid_name(const char *name)
-{
- return !(*name == '\0'
- || !strcmp(name, ".")
- || !strcmp(name, "..")
- || strchr(name, '/'));
-}
-
-/**
- * dev_alloc_name - allocate a name for a device
- * @dev: device
- * @name: name format string
- *
- * Passed a format string - eg "lt%d" it will try and find a suitable
- * id. It scans list of devices to build up a free map, then chooses
- * the first empty slot. The caller must hold the dev_base or rtnl lock
- * while allocating the name and adding the device in order to avoid
- * duplicates.
- * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
- * Returns the number of the unit assigned or a negative errno code.
- */
-
-int dev_alloc_name(struct net_device *dev, const char *name)
-{
- int i = 0;
- char buf[IFNAMSIZ];
- const char *p;
- const int max_netdevices = 8*PAGE_SIZE;
- long *inuse;
- struct net_device *d;
-
- p = strnchr(name, IFNAMSIZ-1, '%');
- if (p) {
- /*
- * Verify the string as this thing may have come from
- * the user. There must be either one "%d" and no other "%"
- * characters.
- */
- if (p[1] != 'd' || strchr(p + 2, '%'))
- return -EINVAL;
-
- /* Use one page as a bit array of possible slots */
- inuse = (long *) get_zeroed_page(GFP_ATOMIC);
- if (!inuse)
- return -ENOMEM;
-
- for (d = dev_base; d; d = d->next) {
- if (!sscanf(d->name, name, &i))
- continue;
- if (i < 0 || i >= max_netdevices)
- continue;
-
- /* avoid cases where sscanf is not exact inverse of printf */
- snprintf(buf, sizeof(buf), name, i);
- if (!strncmp(buf, d->name, IFNAMSIZ))
- set_bit(i, inuse);
- }
-
- i = find_first_zero_bit(inuse, max_netdevices);
- free_page((unsigned long) inuse);
- }
-
- snprintf(buf, sizeof(buf), name, i);
- if (!__dev_get_by_name(buf)) {
- strlcpy(dev->name, buf, IFNAMSIZ);
- return i;
- }
-
- /* It is possible to run out of possible slots
- * when the name is long and there isn't enough space left
- * for the digits, or if all bits are used.
- */
- return -ENFILE;
-}
-
-
-/**
- * dev_change_name - change name of a device
- * @dev: device
- * @newname: name (or format string) must be at least IFNAMSIZ
- *
- * Change name of a device, can pass format strings "eth%d".
- * for wildcarding.
- */
-int dev_change_name(struct net_device *dev, char *newname)
-{
- int err = 0;
-
- ASSERT_RTNL();
-
- if (dev->flags & IFF_UP)
- return -EBUSY;
-
- if (!dev_valid_name(newname))
- return -EINVAL;
-
- if (strchr(newname, '%')) {
- err = dev_alloc_name(dev, newname);
- if (err < 0)
- return err;
- strcpy(newname, dev->name);
- }
- else if (__dev_get_by_name(newname))
- return -EEXIST;
- else
- strlcpy(dev->name, newname, IFNAMSIZ);
-
- err = class_device_rename(&dev->class_dev, dev->name);
- if (!err) {
- hlist_del(&dev->name_hlist);
- hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
- raw_notifier_call_chain(&netdev_chain,
- NETDEV_CHANGENAME, dev);
- }
-
- return err;
-}
-
-/**
- * netdev_features_change - device changes features
- * @dev: device to cause notification
- *
- * Called to indicate a device has changed features.
- */
-void netdev_features_change(struct net_device *dev)
-{
- raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
-}
-EXPORT_SYMBOL(netdev_features_change);
-
-/**
- * netdev_state_change - device changes state
- * @dev: device to cause notification
- *
- * Called to indicate a device has changed state. This function calls
- * the notifier chains for netdev_chain and sends a NEWLINK message
- * to the routing socket.
- */
-void netdev_state_change(struct net_device *dev)
-{
- if (dev->flags & IFF_UP) {
- raw_notifier_call_chain(&netdev_chain,
- NETDEV_CHANGE, dev);
- rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
- }
-}
-
-/**
- * dev_load - load a network module
- * @name: name of interface
- *
- * If a network interface is not present and the process has suitable
- * privileges this function loads the module. If module loading is not
- * available in this kernel then it becomes a nop.
- */
-
-void dev_load(const char *name)
-{
- struct net_device *dev;
-
- read_lock(&dev_base_lock);
- dev = __dev_get_by_name(name);
- read_unlock(&dev_base_lock);
-
- if (!dev && capable(CAP_SYS_MODULE))
- request_module("%s", name);
-}
-
-static int default_rebuild_header(struct sk_buff *skb)
-{
- printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
- skb->dev ? skb->dev->name : "NULL!!!");
- kfree_skb(skb);
- return 1;
-}
-
-
-/**
- * dev_open - prepare an interface for use.
- * @dev: device to open
- *
- * Takes a device from down to up state. The device's private open
- * function is invoked and then the multicast lists are loaded. Finally
- * the device is moved into the up state and a %NETDEV_UP message is
- * sent to the netdev notifier chain.
- *
- * Calling this function on an active interface is a nop. On a failure
- * a negative errno code is returned.
- */
-int dev_open(struct net_device *dev)
-{
- int ret = 0;
-
- /*
- * Is it already up?
- */
-
- if (dev->flags & IFF_UP)
- return 0;
-
- /*
- * Is it even present?
- */
- if (!netif_device_present(dev))
- return -ENODEV;
-
- /*
- * Call device private open method
- */
- set_bit(__LINK_STATE_START, &dev->state);
- if (dev->open) {
- ret = dev->open(dev);
- if (ret)
- clear_bit(__LINK_STATE_START, &dev->state);
- }
-
- /*
- * If it went open OK then:
- */
-
- if (!ret) {
- /*
- * Set the flags.
- */
- dev->flags |= IFF_UP;
-
- /*
- * Initialize multicasting status
- */
- dev_mc_upload(dev);
-
- /*
- * Wakeup transmit queue engine
- */
- dev_activate(dev);
-
- /*
- * ... and announce new interface.
- */
- raw_notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
- }
- return ret;
-}
-
-/**
- * dev_close - shutdown an interface.
- * @dev: device to shutdown
- *
- * This function moves an active device into down state. A
- * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
- * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
- * chain.
- */
-int dev_close(struct net_device *dev)
-{
- if (!(dev->flags & IFF_UP))
- return 0;
-
- /*
- * Tell people we are going down, so that they can
- * prepare to death, when device is still operating.
- */
- raw_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. */
- msleep(1);
- }
-
- /*
- * Call the device specific close. This cannot fail.
- * Only if device is UP
- *
- * We allow it to be called even after a DETACH hot-plug
- * event.
- */
- if (dev->stop)
- dev->stop(dev);
-
- /*
- * Device is now down.
- */
-
- dev->flags &= ~IFF_UP;
-
- /*
- * Tell people we are down
- */
- raw_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
-
- return 0;
-}
-
-
-/*
- * Device change register/unregister. These are not inline or static
- * as we export them to the world.
- */
-
-/**
- * register_netdevice_notifier - register a network notifier block
- * @nb: notifier
- *
- * Register a notifier to be called when network device events occur.
- * The notifier passed is linked into the kernel structures and must
- * not be reused until it has been unregistered. A negative errno code
- * is returned on a failure.
- *
- * When registered all registration and up events are replayed
- * to the new notifier to allow device to have a race free
- * view of the network device list.
- */
-
-int register_netdevice_notifier(struct notifier_block *nb)
-{
- struct net_device *dev;
- int err;
-
- rtnl_lock();
- err = raw_notifier_chain_register(&netdev_chain, nb);
- if (!err) {
- for (dev = dev_base; dev; dev = dev->next) {
- nb->notifier_call(nb, NETDEV_REGISTER, dev);
-
- if (dev->flags & IFF_UP)
- nb->notifier_call(nb, NETDEV_UP, dev);
- }
- }
- rtnl_unlock();
- return err;
-}
-
-/**
- * unregister_netdevice_notifier - unregister a network notifier block
- * @nb: notifier
- *
- * Unregister a notifier previously registered by
- * register_netdevice_notifier(). The notifier is unlinked into the
- * kernel structures and may then be reused. A negative errno code
- * is returned on a failure.
- */
-
-int unregister_netdevice_notifier(struct notifier_block *nb)
-{
- int err;
-
- rtnl_lock();
- err = raw_notifier_chain_unregister(&netdev_chain, nb);
- rtnl_unlock();
- return err;
-}
-
-/**
- * call_netdevice_notifiers - call all network notifier blocks
- * @val: value passed unmodified to notifier function
- * @v: pointer passed unmodified to notifier function
- *
- * Call all network notifier blocks. Parameters and return value
- * are as for raw_notifier_call_chain().
- */
-
-int call_netdevice_notifiers(unsigned long val, void *v)
-{
- return raw_notifier_call_chain(&netdev_chain, val, v);
-}
-
-/* When > 0 there are consumers of rx skb time stamps */
-static atomic_t netstamp_needed = ATOMIC_INIT(0);
-
-void net_enable_timestamp(void)
-{
- atomic_inc(&netstamp_needed);
-}
-
-void net_disable_timestamp(void)
-{
- atomic_dec(&netstamp_needed);
-}
-
-void __net_timestamp(struct sk_buff *skb)
-{
- struct timeval tv;
-
- do_gettimeofday(&tv);
- skb_set_timestamp(skb, &tv);
-}
-EXPORT_SYMBOL(__net_timestamp);
-
-static inline void net_timestamp(struct sk_buff *skb)
-{
- if (atomic_read(&netstamp_needed))
- __net_timestamp(skb);
- else {
- skb->tstamp.off_sec = 0;
- skb->tstamp.off_usec = 0;
- }
-}
-
-/*
- * Support routine. Sends outgoing frames to any network
- * taps currently in use.
- */
-
-static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
-{
- struct packet_type *ptype;
-
- net_timestamp(skb);
-
- rcu_read_lock();
- list_for_each_entry_rcu(ptype, &ptype_all, list) {
- /* Never send packets back to the socket
- * they originated from - MvS (miquels@drinkel.ow.org)
- */
- if ((ptype->dev == dev || !ptype->dev) &&
- (ptype->af_packet_priv == NULL ||
- (struct sock *)ptype->af_packet_priv != skb->sk)) {
- struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
- if (!skb2)
- break;
-
- /* skb->nh should be correctly
- set by sender, so that the second statement is
- just protection against buggy protocols.
- */
- skb2->mac.raw = skb2->data;
-
- if (skb2->nh.raw < skb2->data ||
- skb2->nh.raw > skb2->tail) {
- if (net_ratelimit())
- printk(KERN_CRIT "protocol %04x is "
- "buggy, dev %s\n",
- skb2->protocol, dev->name);
- skb2->nh.raw = skb2->data;
- }
-
- skb2->h.raw = skb2->nh.raw;
- skb2->pkt_type = PACKET_OUTGOING;
- ptype->func(skb2, skb->dev, ptype, skb->dev);
- }
- }
- rcu_read_unlock();
-}
-
-
-void __netif_schedule(struct net_device *dev)
-{
- if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
- unsigned long flags;
- struct softnet_data *sd;
-
- local_irq_save(flags);
- sd = &__get_cpu_var(softnet_data);
- dev->next_sched = sd->output_queue;
- sd->output_queue = dev;
- raise_softirq_irqoff(NET_TX_SOFTIRQ);
- local_irq_restore(flags);
- }
-}
-EXPORT_SYMBOL(__netif_schedule);
-
-void __netif_rx_schedule(struct net_device *dev)
-{
- unsigned long flags;
-
- local_irq_save(flags);
- dev_hold(dev);
- list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
- if (dev->quota < 0)
- dev->quota += dev->weight;
- else
- dev->quota = dev->weight;
- __raise_softirq_irqoff(NET_RX_SOFTIRQ);
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL(__netif_rx_schedule);
-
-void dev_kfree_skb_any(struct sk_buff *skb)
-{
- if (in_irq() || irqs_disabled())
- dev_kfree_skb_irq(skb);
- else
- dev_kfree_skb(skb);
-}
-EXPORT_SYMBOL(dev_kfree_skb_any);
-
-
-/* Hot-plugging. */
-void netif_device_detach(struct net_device *dev)
-{
- if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
- netif_running(dev)) {
- netif_stop_queue(dev);
- }
-}
-EXPORT_SYMBOL(netif_device_detach);
-
-void netif_device_attach(struct net_device *dev)
-{
- if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
- netif_running(dev)) {
- netif_wake_queue(dev);
- __netdev_watchdog_up(dev);
- }
-}
-EXPORT_SYMBOL(netif_device_attach);
-
-
-/*
- * Invalidate hardware checksum when packet is to be mangled, and
- * complete checksum manually on outgoing path.
- */
-int skb_checksum_help(struct sk_buff *skb, int inward)
-{
- unsigned int csum;
- int ret = 0, offset = skb->h.raw - skb->data;
-
- if (inward) {
- skb->ip_summed = CHECKSUM_NONE;
- goto out;
- }
-
- if (skb_cloned(skb)) {
- ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
- if (ret)
- goto out;
- }
-
- BUG_ON(offset > (int)skb->len);
- csum = skb_checksum(skb, offset, skb->len-offset, 0);
-
- offset = skb->tail - skb->h.raw;
- BUG_ON(offset <= 0);
- BUG_ON(skb->csum + 2 > offset);
-
- *(u16*)(skb->h.raw + skb->csum) = csum_fold(csum);
- skb->ip_summed = CHECKSUM_NONE;
-out:
- return ret;
-}
-
-/**
- * skb_gso_segment - Perform segmentation on skb.
- * @skb: buffer to segment
- * @features: features for the output path (see dev->features)
- *
- * This function segments the given skb and returns a list of segments.
- *
- * It may return NULL if the skb requires no segmentation. This is
- * only possible when GSO is used for verifying header integrity.
- */
-struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
-{
- struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
- struct packet_type *ptype;
- int type = skb->protocol;
-
- BUG_ON(skb_shinfo(skb)->frag_list);
- BUG_ON(skb->ip_summed != CHECKSUM_HW);
-
- skb->mac.raw = skb->data;
- skb->mac_len = skb->nh.raw - skb->data;
- __skb_pull(skb, skb->mac_len);
-
- rcu_read_lock();
- list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) {
- if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
- segs = ptype->gso_segment(skb, features);
- break;
- }
- }
- rcu_read_unlock();
-
- __skb_push(skb, skb->data - skb->mac.raw);
-
- return segs;
-}
-
-EXPORT_SYMBOL(skb_gso_segment);
-
-/* Take action when hardware reception checksum errors are detected. */
-#ifdef CONFIG_BUG
-void netdev_rx_csum_fault(struct net_device *dev)
-{
- if (net_ratelimit()) {
- printk(KERN_ERR "%s: hw csum failure.\n",
- dev ? dev->name : "<unknown>");
- dump_stack();
- }
-}
-EXPORT_SYMBOL(netdev_rx_csum_fault);
-#endif
-
-#ifdef CONFIG_HIGHMEM
-/* Actually, we should eliminate this check as soon as we know, that:
- * 1. IOMMU is present and allows to map all the memory.
- * 2. No high memory really exists on this machine.
- */
-
-static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
-{
- int i;
-
- if (dev->features & NETIF_F_HIGHDMA)
- return 0;
-
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
- if (PageHighMem(skb_shinfo(skb)->frags[i].page))
- return 1;
-
- return 0;
-}
-#else
-#define illegal_highdma(dev, skb) (0)
-#endif
-
-struct dev_gso_cb {
- void (*destructor)(struct sk_buff *skb);
-};
-
-#define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
-
-static void dev_gso_skb_destructor(struct sk_buff *skb)
-{
- struct dev_gso_cb *cb;
-
- do {
- struct sk_buff *nskb = skb->next;
-
- skb->next = nskb->next;
- nskb->next = NULL;
- kfree_skb(nskb);
- } while (skb->next);
-
- cb = DEV_GSO_CB(skb);
- if (cb->destructor)
- cb->destructor(skb);
-}
-
-/**
- * dev_gso_segment - Perform emulated hardware segmentation on skb.
- * @skb: buffer to segment
- *
- * This function segments the given skb and stores the list of segments
- * in skb->next.
- */
-static int dev_gso_segment(struct sk_buff *skb)
-{
- struct net_device *dev = skb->dev;
- struct sk_buff *segs;
- int features = dev->features & ~(illegal_highdma(dev, skb) ?
- NETIF_F_SG : 0);
-
- segs = skb_gso_segment(skb, features);
-
- /* Verifying header integrity only. */
- if (!segs)
- return 0;
-
- if (unlikely(IS_ERR(segs)))
- return PTR_ERR(segs);
-
- skb->next = segs;
- DEV_GSO_CB(skb)->destructor = skb->destructor;
- skb->destructor = dev_gso_skb_destructor;
-
- return 0;
-}
-
-int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- if (likely(!skb->next)) {
- if (netdev_nit)
- dev_queue_xmit_nit(skb, dev);
-
- if (netif_needs_gso(dev, skb)) {
- if (unlikely(dev_gso_segment(skb)))
- goto out_kfree_skb;
- if (skb->next)
- goto gso;
- }
-
- return dev->hard_start_xmit(skb, dev);
- }
-
-gso:
- do {
- struct sk_buff *nskb = skb->next;
- int rc;
-
- skb->next = nskb->next;
- nskb->next = NULL;
- rc = dev->hard_start_xmit(nskb, dev);
- if (unlikely(rc)) {
- nskb->next = skb->next;
- skb->next = nskb;
- return rc;
- }
- if (unlikely(netif_queue_stopped(dev) && skb->next))
- return NETDEV_TX_BUSY;
- } while (skb->next);
-
- skb->destructor = DEV_GSO_CB(skb)->destructor;
-
-out_kfree_skb:
- kfree_skb(skb);
- return 0;
-}
-
-#define HARD_TX_LOCK(dev, cpu) { \
- if ((dev->features & NETIF_F_LLTX) == 0) { \
- netif_tx_lock(dev); \
- } \
-}
-
-#define HARD_TX_UNLOCK(dev) { \
- if ((dev->features & NETIF_F_LLTX) == 0) { \
- netif_tx_unlock(dev); \
- } \
-}
-
-#ifdef CONFIG_XEN
-inline int skb_checksum_setup(struct sk_buff *skb)
-{
- if (skb->proto_csum_blank) {
- if (skb->protocol != htons(ETH_P_IP))
- goto out;
- skb->h.raw = (unsigned char *)skb->nh.iph + 4*skb->nh.iph->ihl;
- if (skb->h.raw >= skb->tail)
- goto out;
- switch (skb->nh.iph->protocol) {
- case IPPROTO_TCP:
- skb->csum = offsetof(struct tcphdr, check);
- break;
- case IPPROTO_UDP:
- skb->csum = offsetof(struct udphdr, check);
- break;
- default:
- if (net_ratelimit())
- printk(KERN_ERR "Attempting to checksum a non-"
- "TCP/UDP packet, dropping a protocol"
- " %d packet", skb->nh.iph->protocol);
- goto out;
- }
- if ((skb->h.raw + skb->csum + 2) > skb->tail)
- goto out;
- skb->ip_summed = CHECKSUM_HW;
- skb->proto_csum_blank = 0;
- }
- return 0;
-out:
- return -EPROTO;
-}
-#else
-inline int skb_checksum_setup(struct sk_buff *skb) { return 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.
- *
- * -----------------------------------------------------------------------------------
- * I notice this method can also return errors from the queue disciplines,
- * including NET_XMIT_DROP, which is a positive value. So, errors can also
- * be positive.
- *
- * Regardless of the return value, the skb is consumed, so it is currently
- * difficult to retry a send to this method. (You can bump the ref count
- * before sending to hold a reference for retry if you are careful.)
- *
- * When calling this method, interrupts MUST be enabled. This is because
- * the BH enable code must have IRQs enabled so that it will not deadlock.
- * --BLG
- */
-
-int dev_queue_xmit(struct sk_buff *skb)
-{
- struct net_device *dev = skb->dev;
- struct Qdisc *q;
- int rc = -ENOMEM;
-
- /* If a checksum-deferred packet is forwarded to a device that needs a
- * checksum, correct the pointers and force checksumming.
- */
- if (skb_checksum_setup(skb))
- goto out_kfree_skb;
-
- /* GSO will handle the following emulations directly. */
- if (netif_needs_gso(dev, skb))
- goto gso;
-
- if (skb_shinfo(skb)->frag_list &&
- !(dev->features & NETIF_F_FRAGLIST) &&
- __skb_linearize(skb))
- goto out_kfree_skb;
-
- /* Fragmented skb is linearized if device does not support SG,
- * or if at least one of fragments is in highmem and device
- * does not support DMA from it.
- */
- if (skb_shinfo(skb)->nr_frags &&
- (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
- __skb_linearize(skb))
- goto out_kfree_skb;
-
- /* If packet is not checksummed and device does not support
- * checksumming for this protocol, complete checksumming here.
- */
- if (skb->ip_summed == CHECKSUM_HW &&
- (!(dev->features & NETIF_F_GEN_CSUM) &&
- (!(dev->features & NETIF_F_IP_CSUM) ||
- skb->protocol != htons(ETH_P_IP))))
- if (skb_checksum_help(skb, 0))
- goto out_kfree_skb;
-
-gso:
- spin_lock_prefetch(&dev->queue_lock);
-
- /* Disable soft irqs for various locks below. Also
- * stops preemption for RCU.
- */
- rcu_read_lock_bh();
-
- /* Updates of qdisc are serialized by queue_lock.
- * The struct Qdisc which is pointed to by qdisc is now a
- * rcu structure - it may be accessed without acquiring
- * a lock (but the structure may be stale.) The freeing of the
- * qdisc will be deferred until it's known that there are no
- * more references to it.
- *
- * If the qdisc has an enqueue function, we still need to
- * hold the queue_lock before calling it, since queue_lock
- * also serializes access to the device queue.
- */
-
- q = rcu_dereference(dev->qdisc);
-#ifdef CONFIG_NET_CLS_ACT
- skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
-#endif
- if (q->enqueue) {
- /* Grab device queue */
- spin_lock(&dev->queue_lock);
-
- rc = q->enqueue(skb, q);
-
- qdisc_run(dev);
-
- spin_unlock(&dev->queue_lock);
- rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
- goto out;
- }
-
- /* The device has no queue. Common case for software devices:
- loopback, all the sorts of tunnels...
-
- Really, it is unlikely that netif_tx_lock protection is necessary
- here. (f.e. loopback and IP tunnels are clean ignoring statistics
- counters.)
- However, it is possible, that they rely on protection
- made by us here.
-
- Check this and shot the lock. It is not prone from deadlocks.
- Either shot noqueue qdisc, it is even simpler 8)
- */
- if (dev->flags & IFF_UP) {
- int cpu = smp_processor_id(); /* ok because BHs are off */
-
- if (dev->xmit_lock_owner != cpu) {
-
- HARD_TX_LOCK(dev, cpu);
-
- if (!netif_queue_stopped(dev)) {
- rc = 0;
- if (!dev_hard_start_xmit(skb, dev)) {
- HARD_TX_UNLOCK(dev);
- goto out;
- }
- }
- HARD_TX_UNLOCK(dev);
- if (net_ratelimit())
- printk(KERN_CRIT "Virtual device %s asks to "
- "queue packet!\n", dev->name);
- } else {
- /* Recursion is detected! It is possible,
- * unfortunately */
- if (net_ratelimit())
- printk(KERN_CRIT "Dead loop on virtual device "
- "%s, fix it urgently!\n", dev->name);
- }
- }
-
- rc = -ENETDOWN;
- rcu_read_unlock_bh();
-
-out_kfree_skb:
- kfree_skb(skb);
- return rc;
-out:
- rcu_read_unlock_bh();
- return rc;
-}
-
-
-/*=======================================================================
- Receiver routines
- =======================================================================*/
-
-int netdev_max_backlog = 1000;
-int netdev_budget = 300;
-int weight_p = 64; /* old backlog weight */
-
-DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
-
-
-/**
- * netif_rx - post buffer to the network code
- * @skb: buffer to post
- *
- * This function receives a packet from a device driver and queues it for
- * the upper (protocol) levels to process. It always succeeds. The buffer
- * may be dropped during processing for congestion control or by the
- * protocol layers.
- *
- * return values:
- * NET_RX_SUCCESS (no congestion)
- * NET_RX_CN_LOW (low congestion)
- * NET_RX_CN_MOD (moderate congestion)
- * NET_RX_CN_HIGH (high congestion)
- * NET_RX_DROP (packet was dropped)
- *
- */
-
-int netif_rx(struct sk_buff *skb)
-{
- struct softnet_data *queue;
- unsigned long flags;
-
- /* if netpoll wants it, pretend we never saw it */
- if (netpoll_rx(skb))
- return NET_RX_DROP;
-
- if (!skb->tstamp.off_sec)
- net_timestamp(skb);
-
- /*
- * The code is rearranged so that the path is the most
- * short when CPU is congested, but is still operating.
- */
- local_irq_save(flags);
- queue = &__get_cpu_var(softnet_data);
-
- __get_cpu_var(netdev_rx_stat).total++;
- if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
- if (queue->input_pkt_queue.qlen) {
-enqueue:
- dev_hold(skb->dev);
- __skb_queue_tail(&queue->input_pkt_queue, skb);
- local_irq_restore(flags);
- return NET_RX_SUCCESS;
- }
-
- netif_rx_schedule(&queue->backlog_dev);
- goto enqueue;
- }
-
- __get_cpu_var(netdev_rx_stat).dropped++;
- local_irq_restore(flags);
-
- kfree_skb(skb);
- return NET_RX_DROP;
-}
-
-int netif_rx_ni(struct sk_buff *skb)
-{
- int err;
-
- preempt_disable();
- err = netif_rx(skb);
- if (local_softirq_pending())
- do_softirq();
- preempt_enable();
-
- return err;
-}
-
-EXPORT_SYMBOL(netif_rx_ni);
-
-static inline struct net_device *skb_bond(struct sk_buff *skb)
-{
- struct net_device *dev = skb->dev;
-
- if (dev->master) {
- /*
- * On bonding slaves other than the currently active
- * slave, suppress duplicates except for 802.3ad
- * ETH_P_SLOW and alb non-mcast/bcast.
- */
- if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
- if (dev->master->priv_flags & IFF_MASTER_ALB) {
- if (skb->pkt_type != PACKET_BROADCAST &&
- skb->pkt_type != PACKET_MULTICAST)
- goto keep;
- }
-
- if (dev->master->priv_flags & IFF_MASTER_8023AD &&
- skb->protocol == __constant_htons(ETH_P_SLOW))
- goto keep;
-
- kfree_skb(skb);
- return NULL;
- }
-keep:
- skb->dev = dev->master;
- }
-
- return dev;
-}
-
-static void net_tx_action(struct softirq_action *h)
-{
- struct softnet_data *sd = &__get_cpu_var(softnet_data);
-
- if (sd->completion_queue) {
- struct sk_buff *clist;
-
- local_irq_disable();
- clist = sd->completion_queue;
- sd->completion_queue = NULL;
- local_irq_enable();
-
- while (clist) {
- struct sk_buff *skb = clist;
- clist = clist->next;
-
- BUG_TRAP(!atomic_read(&skb->users));
- __kfree_skb(skb);
- }
- }
-
- if (sd->output_queue) {
- struct net_device *head;
-
- local_irq_disable();
- head = sd->output_queue;
- sd->output_queue = NULL;
- local_irq_enable();
-
- while (head) {
- struct net_device *dev = head;
- head = head->next_sched;
-
- smp_mb__before_clear_bit();
- clear_bit(__LINK_STATE_SCHED, &dev->state);
-
- if (spin_trylock(&dev->queue_lock)) {
- qdisc_run(dev);
- spin_unlock(&dev->queue_lock);
- } else {
- netif_schedule(dev);
- }
- }
- }
-}
-
-static __inline__ int deliver_skb(struct sk_buff *skb,
- struct packet_type *pt_prev,
- struct net_device *orig_dev)
-{
- atomic_inc(&skb->users);
- return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
-}
-
-#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
-int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);
-struct net_bridge;
-struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
- unsigned char *addr);
-void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
-
-static __inline__ int handle_bridge(struct sk_buff **pskb,
- struct packet_type **pt_prev, int *ret,
- struct net_device *orig_dev)
-{
- struct net_bridge_port *port;
-
- if ((*pskb)->pkt_type == PACKET_LOOPBACK ||
- (port = rcu_dereference((*pskb)->dev->br_port)) == NULL)
- return 0;
-
- if (*pt_prev) {
- *ret = deliver_skb(*pskb, *pt_prev, orig_dev);
- *pt_prev = NULL;
- }
-
- return br_handle_frame_hook(port, pskb);
-}
-#else
-#define handle_bridge(skb, pt_prev, ret, orig_dev) (0)
-#endif
-
-#ifdef CONFIG_NET_CLS_ACT
-/* TODO: Maybe we should just force sch_ingress to be compiled in
- * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
- * a compare and 2 stores extra right now if we dont have it on
- * but have CONFIG_NET_CLS_ACT
- * NOTE: This doesnt stop any functionality; if you dont have
- * the ingress scheduler, you just cant add policies on ingress.
- *
- */
-static int ing_filter(struct sk_buff *skb)
-{
- struct Qdisc *q;
- struct net_device *dev = skb->dev;
- int result = TC_ACT_OK;
-
- if (dev->qdisc_ingress) {
- __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
- if (MAX_RED_LOOP < ttl++) {
- printk("Redir loop detected Dropping packet (%s->%s)\n",
- skb->input_dev->name, skb->dev->name);
- return TC_ACT_SHOT;
- }
-
- skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
-
- skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
-
- spin_lock(&dev->ingress_lock);
- if ((q = dev->qdisc_ingress) != NULL)
- result = q->enqueue(skb, q);
- spin_unlock(&dev->ingress_lock);
-
- }
-
- return result;
-}
-#endif
-
-int netif_receive_skb(struct sk_buff *skb)
-{
- struct packet_type *ptype, *pt_prev;
- struct net_device *orig_dev;
- int ret = NET_RX_DROP;
- unsigned short type;
-
- /* if we've gotten here through NAPI, check netpoll */
- if (skb->dev->poll && netpoll_rx(skb))
- return NET_RX_DROP;
-
- if (!skb->tstamp.off_sec)
- net_timestamp(skb);
-
- if (!skb->input_dev)
- skb->input_dev = skb->dev;
-
- orig_dev = skb_bond(skb);
-
- if (!orig_dev)
- return NET_RX_DROP;
-
- __get_cpu_var(netdev_rx_stat).total++;
-
- skb->h.raw = skb->nh.raw = skb->data;
- skb->mac_len = skb->nh.raw - skb->mac.raw;
-
- pt_prev = NULL;
-
- rcu_read_lock();
-
-#ifdef CONFIG_NET_CLS_ACT
- if (skb->tc_verd & TC_NCLS) {
- skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
- goto ncls;
- }
-#endif
-
-#ifdef CONFIG_XEN
- switch (skb->ip_summed) {
- case CHECKSUM_UNNECESSARY:
- skb->proto_data_valid = 1;
- break;
- case CHECKSUM_HW:
- /* XXX Implement me. */
- default:
- skb->proto_data_valid = 0;
- break;
- }
-#endif
-
- list_for_each_entry_rcu(ptype, &ptype_all, list) {
- if (!ptype->dev || ptype->dev == skb->dev) {
- if (pt_prev)
- ret = deliver_skb(skb, pt_prev, orig_dev);
- pt_prev = ptype;
- }
- }
-
-#ifdef CONFIG_NET_CLS_ACT
- if (pt_prev) {
- ret = deliver_skb(skb, pt_prev, orig_dev);
- pt_prev = NULL; /* noone else should process this after*/
- } else {
- skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
- }
-
- ret = ing_filter(skb);
-
- if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
- kfree_skb(skb);
- goto out;
- }
-
- skb->tc_verd = 0;
-ncls:
-#endif
-
- handle_diverter(skb);
-
- if (handle_bridge(&skb, &pt_prev, &ret, orig_dev))
- goto out;
-
- type = skb->protocol;
- list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
- if (ptype->type == type &&
- (!ptype->dev || ptype->dev == skb->dev)) {
- if (pt_prev)
- ret = deliver_skb(skb, pt_prev, orig_dev);
- pt_prev = ptype;
- }
- }
-
- if (pt_prev) {
- ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
- } else {
- kfree_skb(skb);
- /* Jamal, now you will not able to escape explaining
- * me how you were going to use this. :-)
- */
- ret = NET_RX_DROP;
- }
-
-out:
- rcu_read_unlock();
- return ret;
-}
-
-static int process_backlog(struct net_device *backlog_dev, int *budget)
-{
- int work = 0;
- int quota = min(backlog_dev->quota, *budget);
- struct softnet_data *queue = &__get_cpu_var(softnet_data);
- unsigned long start_time = jiffies;
-
- backlog_dev->weight = weight_p;
- for (;;) {
- struct sk_buff *skb;
- struct net_device *dev;
-
- local_irq_disable();
- skb = __skb_dequeue(&queue->input_pkt_queue);
- if (!skb)
- goto job_done;
- local_irq_enable();
-
- dev = skb->dev;
-
- netif_receive_skb(skb);
-
- dev_put(dev);
-
- work++;
-
- if (work >= quota || jiffies - start_time > 1)
- break;
-
- }
-
- backlog_dev->quota -= work;
- *budget -= work;
- return -1;
-
-job_done:
- backlog_dev->quota -= work;
- *budget -= work;
-
- list_del(&backlog_dev->poll_list);
- smp_mb__before_clear_bit();
- netif_poll_enable(backlog_dev);
-
- local_irq_enable();
- return 0;
-}
-
-static void net_rx_action(struct softirq_action *h)
-{
- struct softnet_data *queue = &__get_cpu_var(softnet_data);
- unsigned long start_time = jiffies;
- int budget = netdev_budget;
- void *have;
-
- 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);
- have = netpoll_poll_lock(dev);
-
- if (dev->quota <= 0 || dev->poll(dev, &budget)) {
- netpoll_poll_unlock(have);
- local_irq_disable();
- list_move_tail(&dev->poll_list, &queue->poll_list);
- if (dev->quota < 0)
- dev->quota += dev->weight;
- else
- dev->quota = dev->weight;
- } else {
- netpoll_poll_unlock(have);
- dev_put(dev);
- local_irq_disable();
- }
- }
-out:
- local_irq_enable();
- return;
-
-softnet_break:
- __get_cpu_var(netdev_rx_stat).time_squeeze++;
- __raise_softirq_irqoff(NET_RX_SOFTIRQ);
- goto out;
-}
-
-static gifconf_func_t * gifconf_list [NPROTO];
-
-/**
- * register_gifconf - register a SIOCGIF handler
- * @family: Address family
- * @gifconf: Function handler
- *
- * Register protocol dependent address dumping routines. The handler
- * that is passed must not be freed or reused until it has been replaced
- * by another handler.
- */
-int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
-{
- if (family >= NPROTO)
- return -EINVAL;
- gifconf_list[family] = gifconf;
- return 0;
-}
-
-
-/*
- * Map an interface index to its name (SIOCGIFNAME)
- */
-
-/*
- * We need this ioctl for efficient implementation of the
- * if_indextoname() function required by the IPv6 API. Without
- * it, we would have to search all the interfaces to find a
- * match. --pb
- */
-
-static int dev_ifname(struct ifreq __user *arg)
-{
- struct net_device *dev;
- struct ifreq ifr;
-
- /*
- * Fetch the caller's info block.
- */
-
- if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
- return -EFAULT;
-
- read_lock(&dev_base_lock);
- dev = __dev_get_by_index(ifr.ifr_ifindex);
- if (!dev) {
- read_unlock(&dev_base_lock);
- return -ENODEV;
- }
-
- strcpy(ifr.ifr_name, dev->name);
- read_unlock(&dev_base_lock);
-
- if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
- return -EFAULT;
- return 0;
-}
-
-/*
- * Perform a SIOCGIFCONF call. This structure will change
- * size eventually, and there is nothing I can do about it.
- * Thus we will need a 'compatibility mode'.
- */
-
-static int dev_ifconf(char __user *arg)
-{
- struct ifconf ifc;
- struct net_device *dev;
- char __user *pos;
- int len;
- int total;
- int i;
-
- /*
- * Fetch the caller's info block.
- */
-
- if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
- return -EFAULT;
-
- pos = ifc.ifc_buf;
- len = ifc.ifc_len;
-
- /*
- * Loop over the interfaces, and write an info block for each.
- */
-
- total = 0;
- for (dev = dev_base; dev; dev = dev->next) {
- if (vx_flags(VXF_HIDE_NETIF, 0) &&
- !dev_in_nx_info(dev, current->nx_info))
- continue;
- for (i = 0; i < NPROTO; i++) {
- if (gifconf_list[i]) {
- int done;
- if (!pos)
- done = gifconf_list[i](dev, NULL, 0);
- else
- done = gifconf_list[i](dev, pos + total,
- len - total);
- if (done < 0)
- return -EFAULT;
- total += done;
- }
- }
- }
-
- /*
- * All done. Write the updated control block back to the caller.
- */
- ifc.ifc_len = total;
-
- /*
- * Both BSD and Solaris return 0 here, so we do too.
- */
- return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
-}
-
-#ifdef CONFIG_PROC_FS
-/*
- * This is invoked by the /proc filesystem handler to display a device
- * in detail.
- */
-static __inline__ struct net_device *dev_get_idx(loff_t pos)
-{
- struct net_device *dev;
- loff_t i;
-
- for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next);
-
- return i == pos ? dev : NULL;
-}
-
-void *dev_seq_start(struct seq_file *seq, loff_t *pos)
-{
- read_lock(&dev_base_lock);
- return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN;
-}
-
-void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
-{
- ++*pos;
- return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next;
-}
-
-void dev_seq_stop(struct seq_file *seq, void *v)
-{
- read_unlock(&dev_base_lock);
-}
-
-static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
-{
- struct nx_info *nxi = current->nx_info;
-
- if (vx_flags(VXF_HIDE_NETIF, 0) && !dev_in_nx_info(dev, nxi))
- return;
- if (dev->get_stats) {
- struct net_device_stats *stats = dev->get_stats(dev);
-
- seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
- "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
- dev->name, stats->rx_bytes, stats->rx_packets,
- stats->rx_errors,
- stats->rx_dropped + stats->rx_missed_errors,
- stats->rx_fifo_errors,
- stats->rx_length_errors + stats->rx_over_errors +
- stats->rx_crc_errors + stats->rx_frame_errors,
- stats->rx_compressed, stats->multicast,
- stats->tx_bytes, stats->tx_packets,
- stats->tx_errors, stats->tx_dropped,
- stats->tx_fifo_errors, stats->collisions,
- stats->tx_carrier_errors +
- stats->tx_aborted_errors +
- stats->tx_window_errors +
- stats->tx_heartbeat_errors,
- stats->tx_compressed);
- } else
- seq_printf(seq, "%6s: No statistics available.\n", dev->name);
-}
-
-/*
- * Called from the PROCfs module. This now uses the new arbitrary sized
- * /proc/net interface to create /proc/net/dev
- */
-static int dev_seq_show(struct seq_file *seq, void *v)
-{
- if (v == SEQ_START_TOKEN)
- seq_puts(seq, "Inter-| Receive "
- " | Transmit\n"
- " face |bytes packets errs drop fifo frame "
- "compressed multicast|bytes packets errs "
- "drop fifo colls carrier compressed\n");
- else
- dev_seq_printf_stats(seq, v);
- return 0;
-}
-
-static struct netif_rx_stats *softnet_get_online(loff_t *pos)
-{
- struct netif_rx_stats *rc = NULL;
-
- while (*pos < NR_CPUS)
- if (cpu_online(*pos)) {
- rc = &per_cpu(netdev_rx_stat, *pos);
- break;
- } else
- ++*pos;
- return rc;
-}
-
-static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
-{
- return softnet_get_online(pos);
-}
-
-static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
-{
- ++*pos;
- return softnet_get_online(pos);
-}
-
-static void softnet_seq_stop(struct seq_file *seq, void *v)
-{
-}
-
-static int softnet_seq_show(struct seq_file *seq, void *v)
-{
- struct netif_rx_stats *s = v;
-
- seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
- s->total, s->dropped, s->time_squeeze, 0,
- 0, 0, 0, 0, /* was fastroute */
- s->cpu_collision );
- return 0;
-}
-
-static struct seq_operations dev_seq_ops = {
- .start = dev_seq_start,
- .next = dev_seq_next,
- .stop = dev_seq_stop,
- .show = dev_seq_show,
-};
-
-static int dev_seq_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &dev_seq_ops);
-}
-
-static struct file_operations dev_seq_fops = {
- .owner = THIS_MODULE,
- .open = dev_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-
-static struct seq_operations softnet_seq_ops = {
- .start = softnet_seq_start,
- .next = softnet_seq_next,
- .stop = softnet_seq_stop,
- .show = softnet_seq_show,
-};
-
-static int softnet_seq_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &softnet_seq_ops);
-}
-
-static struct file_operations softnet_seq_fops = {
- .owner = THIS_MODULE,
- .open = softnet_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-
-#ifdef CONFIG_WIRELESS_EXT
-extern int wireless_proc_init(void);
-#else
-#define wireless_proc_init() 0
-#endif
-
-static int __init dev_proc_init(void)
-{
- int rc = -ENOMEM;
-
- if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops))
- goto out;
- if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
- goto out_dev;
- if (wireless_proc_init())
- goto out_softnet;
- rc = 0;
-out:
- return rc;
-out_softnet:
- proc_net_remove("softnet_stat");
-out_dev:
- proc_net_remove("dev");
- goto out;
-}
-#else
-#define dev_proc_init() 0
-#endif /* CONFIG_PROC_FS */
-
-
-/**
- * netdev_set_master - set up master/slave pair
- * @slave: slave device
- * @master: new master device
- *
- * Changes the master device of the slave. Pass %NULL to break the
- * bonding. The caller must hold the RTNL semaphore. On a failure
- * a negative errno code is returned. On success the reference counts
- * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
- * function returns zero.
- */
-int netdev_set_master(struct net_device *slave, struct net_device *master)
-{
- struct net_device *old = slave->master;
-
- ASSERT_RTNL();
-
- if (master) {
- if (old)
- return -EBUSY;
- dev_hold(master);
- }
-
- slave->master = master;
-
- synchronize_net();
-
- if (old)
- dev_put(old);
-
- if (master)
- slave->flags |= IFF_SLAVE;
- else
- slave->flags &= ~IFF_SLAVE;
-
- rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
- return 0;
-}
-
-/**
- * dev_set_promiscuity - update promiscuity count on a device
- * @dev: device
- * @inc: modifier
- *
- * Add or remove promiscuity from a device. While the count in the device
- * remains above zero the interface remains promiscuous. Once it hits zero
- * the device reverts back to normal filtering operation. A negative inc
- * value is used to drop promiscuity on the device.
- */
-void dev_set_promiscuity(struct net_device *dev, int inc)
-{
- unsigned short old_flags = dev->flags;
-
- if ((dev->promiscuity += inc) == 0)
- dev->flags &= ~IFF_PROMISC;
- else
- dev->flags |= IFF_PROMISC;
- if (dev->flags != old_flags) {
- dev_mc_upload(dev);
- printk(KERN_INFO "device %s %s promiscuous mode\n",
- dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
- "left");
- audit_log(current->audit_context, GFP_ATOMIC,
- AUDIT_ANOM_PROMISCUOUS,
- "dev=%s prom=%d old_prom=%d auid=%u",
- dev->name, (dev->flags & IFF_PROMISC),
- (old_flags & IFF_PROMISC),
- audit_get_loginuid(current->audit_context));
- }
-}
-
-/**
- * dev_set_allmulti - update allmulti count on a device
- * @dev: device
- * @inc: modifier
- *
- * Add or remove reception of all multicast frames to a device. While the
- * count in the device remains above zero the interface remains listening
- * to all interfaces. Once it hits zero the device reverts back to normal
- * filtering operation. A negative @inc value is used to drop the counter
- * when releasing a resource needing all multicasts.
- */
-
-void dev_set_allmulti(struct net_device *dev, int inc)
-{
- unsigned short old_flags = dev->flags;
-
- dev->flags |= IFF_ALLMULTI;
- if ((dev->allmulti += inc) == 0)
- dev->flags &= ~IFF_ALLMULTI;
- if (dev->flags ^ old_flags)
- dev_mc_upload(dev);
-}
-
-unsigned dev_get_flags(const struct net_device *dev)
-{
- unsigned flags;
-
- flags = (dev->flags & ~(IFF_PROMISC |
- IFF_ALLMULTI |
- IFF_RUNNING |
- IFF_LOWER_UP |
- IFF_DORMANT)) |
- (dev->gflags & (IFF_PROMISC |
- IFF_ALLMULTI));
-
- if (netif_running(dev)) {
- if (netif_oper_up(dev))
- flags |= IFF_RUNNING;
- if (netif_carrier_ok(dev))
- flags |= IFF_LOWER_UP;
- if (netif_dormant(dev))
- flags |= IFF_DORMANT;
- }
-
- return flags;
-}
-
-int dev_change_flags(struct net_device *dev, unsigned flags)
-{
- int ret;
- int old_flags = dev->flags;
-
- /*
- * Set the flags on our device.
- */
-
- dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
- IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
- IFF_AUTOMEDIA)) |
- (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
- IFF_ALLMULTI));
-
- /*
- * Load in the correct multicast list now the flags have changed.
- */
-
- dev_mc_upload(dev);
-
- /*
- * Have we downed the interface. We handle IFF_UP ourselves
- * according to user attempts to set it, rather than blindly
- * setting it.
- */
-
- ret = 0;
- if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
- ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
-
- if (!ret)
- dev_mc_upload(dev);
- }
-
- if (dev->flags & IFF_UP &&
- ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
- IFF_VOLATILE)))
- raw_notifier_call_chain(&netdev_chain,
- NETDEV_CHANGE, dev);
-
- if ((flags ^ dev->gflags) & IFF_PROMISC) {
- int inc = (flags & IFF_PROMISC) ? +1 : -1;
- dev->gflags ^= IFF_PROMISC;
- dev_set_promiscuity(dev, inc);
- }
-
- /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
- is important. Some (broken) drivers set IFF_PROMISC, when
- IFF_ALLMULTI is requested not asking us and not reporting.
- */
- if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
- int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
- dev->gflags ^= IFF_ALLMULTI;
- dev_set_allmulti(dev, inc);
- }
-
- if (old_flags ^ dev->flags)
- rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags);
-
- return ret;
-}
-
-int dev_set_mtu(struct net_device *dev, int new_mtu)
-{
- int err;
-
- if (new_mtu == dev->mtu)
- return 0;
-
- /* MTU must be positive. */
- if (new_mtu < 0)
- return -EINVAL;
-
- if (!netif_device_present(dev))
- return -ENODEV;
-
- err = 0;
- if (dev->change_mtu)
- err = dev->change_mtu(dev, new_mtu);
- else
- dev->mtu = new_mtu;
- if (!err && dev->flags & IFF_UP)
- raw_notifier_call_chain(&netdev_chain,
- NETDEV_CHANGEMTU, dev);
- return err;
-}
-
-int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
-{
- int err;
-
- if (!dev->set_mac_address)
- return -EOPNOTSUPP;
- if (sa->sa_family != dev->type)
- return -EINVAL;
- if (!netif_device_present(dev))
- return -ENODEV;
- err = dev->set_mac_address(dev, sa);
- if (!err)
- raw_notifier_call_chain(&netdev_chain,
- NETDEV_CHANGEADDR, dev);
- return err;
-}
-
-/*
- * Perform the SIOCxIFxxx calls.
- */
-static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
-{
- int err;
- struct net_device *dev = __dev_get_by_name(ifr->ifr_name);
-
- if (!dev)
- return -ENODEV;
-
- switch (cmd) {
- case SIOCGIFFLAGS: /* Get interface flags */
- ifr->ifr_flags = dev_get_flags(dev);
- return 0;
-
- case SIOCSIFFLAGS: /* Set interface flags */
- return dev_change_flags(dev, ifr->ifr_flags);
-
- case SIOCGIFMETRIC: /* Get the metric on the interface
- (currently unused) */
- ifr->ifr_metric = 0;
- return 0;
-
- case SIOCSIFMETRIC: /* Set the metric on the interface
- (currently unused) */
- return -EOPNOTSUPP;
-
- case SIOCGIFMTU: /* Get the MTU of a device */
- ifr->ifr_mtu = dev->mtu;
- return 0;
-
- case SIOCSIFMTU: /* Set the MTU of a device */
- return dev_set_mtu(dev, ifr->ifr_mtu);
-
- case SIOCGIFHWADDR:
- if (!dev->addr_len)
- memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
- else
- memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
- min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
- ifr->ifr_hwaddr.sa_family = dev->type;
- return 0;
-
- case SIOCSIFHWADDR:
- return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
-
- case SIOCSIFHWBROADCAST:
- if (ifr->ifr_hwaddr.sa_family != dev->type)
- return -EINVAL;
- memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
- min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
- raw_notifier_call_chain(&netdev_chain,
- NETDEV_CHANGEADDR, dev);
- return 0;
-
- case SIOCGIFMAP:
- ifr->ifr_map.mem_start = dev->mem_start;
- ifr->ifr_map.mem_end = dev->mem_end;
- ifr->ifr_map.base_addr = dev->base_addr;
- ifr->ifr_map.irq = dev->irq;
- ifr->ifr_map.dma = dev->dma;
- ifr->ifr_map.port = dev->if_port;
- return 0;
-
- case SIOCSIFMAP:
- if (dev->set_config) {
- if (!netif_device_present(dev))
- return -ENODEV;
- return dev->set_config(dev, &ifr->ifr_map);
- }
- return -EOPNOTSUPP;
-
- case SIOCADDMULTI:
- if (!dev->set_multicast_list ||
- ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
- return -EINVAL;
- if (!netif_device_present(dev))
- return -ENODEV;
- return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
- dev->addr_len, 1);
-
- case SIOCDELMULTI:
- if (!dev->set_multicast_list ||
- ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
- return -EINVAL;
- if (!netif_device_present(dev))
- return -ENODEV;
- return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
- dev->addr_len, 1);
-
- case SIOCGIFINDEX:
- ifr->ifr_ifindex = dev->ifindex;
- return 0;
-
- case SIOCGIFTXQLEN:
- ifr->ifr_qlen = dev->tx_queue_len;
- return 0;
-
- case SIOCSIFTXQLEN:
- if (ifr->ifr_qlen < 0)
- return -EINVAL;
- dev->tx_queue_len = ifr->ifr_qlen;
- return 0;
-
- case SIOCSIFNAME:
- ifr->ifr_newname[IFNAMSIZ-1] = '\0';
- return dev_change_name(dev, ifr->ifr_newname);
-
- /*
- * Unknown or private ioctl
- */
-
- default:
- if ((cmd >= SIOCDEVPRIVATE &&
- cmd <= SIOCDEVPRIVATE + 15) ||
- cmd == SIOCBONDENSLAVE ||
- cmd == SIOCBONDRELEASE ||
- cmd == SIOCBONDSETHWADDR ||
- cmd == SIOCBONDSLAVEINFOQUERY ||
- cmd == SIOCBONDINFOQUERY ||
- cmd == SIOCBONDCHANGEACTIVE ||
- cmd == SIOCGMIIPHY ||
- cmd == SIOCGMIIREG ||
- cmd == SIOCSMIIREG ||
- cmd == SIOCBRADDIF ||
- cmd == SIOCBRDELIF ||
- cmd == SIOCWANDEV) {
- err = -EOPNOTSUPP;
- if (dev->do_ioctl) {
- if (netif_device_present(dev))
- err = dev->do_ioctl(dev, ifr,
- cmd);
- else
- err = -ENODEV;
- }
- } else
- err = -EINVAL;
-
- }
- return err;
-}
-
-/*
- * This function handles all "interface"-type I/O control requests. The actual
- * 'doing' part of this is dev_ifsioc above.
- */
-
-/**
- * dev_ioctl - network device ioctl
- * @cmd: command to issue
- * @arg: pointer to a struct ifreq in user space
- *
- * Issue ioctl functions to devices. This is normally called by the
- * user space syscall interfaces but can sometimes be useful for
- * other purposes. The return value is the return from the syscall if
- * positive or a negative errno code on error.
- */
-
-int dev_ioctl(unsigned int cmd, void __user *arg)
-{
- struct ifreq ifr;
- int ret;
- char *colon;
-
- /* One special case: SIOCGIFCONF takes ifconf argument
- and requires shared lock, because it sleeps writing
- to user space.
- */
-
- if (cmd == SIOCGIFCONF) {
- rtnl_lock();
- ret = dev_ifconf((char __user *) arg);
- rtnl_unlock();
- return ret;
- }
- if (cmd == SIOCGIFNAME)
- return dev_ifname((struct ifreq __user *)arg);
-
- if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
- return -EFAULT;
-
- ifr.ifr_name[IFNAMSIZ-1] = 0;
-
- colon = strchr(ifr.ifr_name, ':');
- if (colon)
- *colon = 0;
-
- /*
- * See which interface the caller is talking about.
- */
-
- switch (cmd) {
- /*
- * These ioctl calls:
- * - can be done by all.
- * - atomic and do not require locking.
- * - return a value
- */
- case SIOCGIFFLAGS:
- case SIOCGIFMETRIC:
- case SIOCGIFMTU:
- case SIOCGIFHWADDR:
- case SIOCGIFSLAVE:
- case SIOCGIFMAP:
- case SIOCGIFINDEX:
- case SIOCGIFTXQLEN:
- dev_load(ifr.ifr_name);
- read_lock(&dev_base_lock);
- ret = dev_ifsioc(&ifr, cmd);
- read_unlock(&dev_base_lock);
- if (!ret) {
- if (colon)
- *colon = ':';
- if (copy_to_user(arg, &ifr,
- sizeof(struct ifreq)))
- ret = -EFAULT;
- }
- return ret;
-
- case SIOCETHTOOL:
- dev_load(ifr.ifr_name);
- rtnl_lock();
- ret = dev_ethtool(&ifr);
- rtnl_unlock();
- if (!ret) {
- if (colon)
- *colon = ':';
- if (copy_to_user(arg, &ifr,
- sizeof(struct ifreq)))
- ret = -EFAULT;
- }
- return ret;
-
- /*
- * These ioctl calls:
- * - require superuser power.
- * - require strict serialization.
- * - return a value
- */
- case SIOCGMIIPHY:
- case SIOCGMIIREG:
- case SIOCSIFNAME:
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- dev_load(ifr.ifr_name);
- rtnl_lock();
- ret = dev_ifsioc(&ifr, cmd);
- rtnl_unlock();
- if (!ret) {
- if (colon)
- *colon = ':';
- if (copy_to_user(arg, &ifr,
- sizeof(struct ifreq)))
- ret = -EFAULT;
- }
- return ret;
-
- /*
- * These ioctl calls:
- * - require superuser power.
- * - require strict serialization.
- * - do not return a value
- */
- case SIOCSIFFLAGS:
- case SIOCSIFMETRIC:
- case SIOCSIFMTU:
- case SIOCSIFMAP:
- case SIOCSIFHWADDR:
- case SIOCSIFSLAVE:
- case SIOCADDMULTI:
- case SIOCDELMULTI:
- case SIOCSIFHWBROADCAST:
- case SIOCSIFTXQLEN:
- case SIOCSMIIREG:
- case SIOCBONDENSLAVE:
- case SIOCBONDRELEASE:
- case SIOCBONDSETHWADDR:
- case SIOCBONDCHANGEACTIVE:
- case SIOCBRADDIF:
- case SIOCBRDELIF:
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- /* fall through */
- case SIOCBONDSLAVEINFOQUERY:
- case SIOCBONDINFOQUERY:
- dev_load(ifr.ifr_name);
- rtnl_lock();
- ret = dev_ifsioc(&ifr, cmd);
- rtnl_unlock();
- return ret;
-
- case SIOCGIFMEM:
- /* Get the per device memory space. We can add this but
- * currently do not support it */
- case SIOCSIFMEM:
- /* Set the per device memory buffer space.
- * Not applicable in our case */
- case SIOCSIFLINK:
- return -EINVAL;
-
- /*
- * Unknown or private ioctl.
- */
- default:
- if (cmd == SIOCWANDEV ||
- (cmd >= SIOCDEVPRIVATE &&
- cmd <= SIOCDEVPRIVATE + 15)) {
- dev_load(ifr.ifr_name);
- rtnl_lock();
- ret = dev_ifsioc(&ifr, cmd);
- rtnl_unlock();
- if (!ret && copy_to_user(arg, &ifr,
- sizeof(struct ifreq)))
- ret = -EFAULT;
- return ret;
- }
-#ifdef CONFIG_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
- || cmd == SIOCGIWENCODEEXT) {
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
- }
- dev_load(ifr.ifr_name);
- rtnl_lock();
- /* Follow me in net/core/wireless.c */
- ret = wireless_process_ioctl(&ifr, cmd);
- rtnl_unlock();
- if (IW_IS_GET(cmd) &&
- copy_to_user(arg, &ifr,
- sizeof(struct ifreq)))
- ret = -EFAULT;
- return ret;
- }
-#endif /* CONFIG_WIRELESS_EXT */
- return -EINVAL;
- }
-}
-
-
-/**
- * dev_new_index - allocate an ifindex
- *
- * Returns a suitable unique value for a new device interface
- * number. The caller must hold the rtnl semaphore or the
- * dev_base_lock to be sure it remains unique.
- */
-static int dev_new_index(void)
-{
- static int ifindex;
- for (;;) {
- if (++ifindex <= 0)
- ifindex = 1;
- if (!__dev_get_by_index(ifindex))
- return ifindex;
- }
-}
-
-static int dev_boot_phase = 1;
-
-/* Delayed registration/unregisteration */
-static DEFINE_SPINLOCK(net_todo_list_lock);
-static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
-
-static inline void net_set_todo(struct net_device *dev)
-{
- spin_lock(&net_todo_list_lock);
- list_add_tail(&dev->todo_list, &net_todo_list);
- spin_unlock(&net_todo_list_lock);
-}
-
-/**
- * register_netdevice - register a network device
- * @dev: device to register
- *
- * Take a completed network device structure and add it to the kernel
- * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
- * chain. 0 is returned on success. A negative errno code is returned
- * on a failure to set up the device, or if the name is a duplicate.
- *
- * Callers must hold the rtnl semaphore. You may want
- * register_netdev() instead of this.
- *
- * BUGS:
- * The locking appears insufficient to guarantee two parallel registers
- * will not get the same name.
- */
-
-int register_netdevice(struct net_device *dev)
-{
- struct hlist_head *head;
- struct hlist_node *p;
- int ret;
-
- BUG_ON(dev_boot_phase);
- ASSERT_RTNL();
-
- might_sleep();
-
- /* When net_device's are persistent, this will be fatal. */
- BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
-
- spin_lock_init(&dev->queue_lock);
- spin_lock_init(&dev->_xmit_lock);
- dev->xmit_lock_owner = -1;
-#ifdef CONFIG_NET_CLS_ACT
- spin_lock_init(&dev->ingress_lock);
-#endif
-
- ret = alloc_divert_blk(dev);
- if (ret)
- goto out;
-
- dev->iflink = -1;
-
- /* Init, if this function is available */
- if (dev->init) {
- ret = dev->init(dev);
- if (ret) {
- if (ret > 0)
- ret = -EIO;
- goto out_err;
- }
- }
-
- if (!dev_valid_name(dev->name)) {
- ret = -EINVAL;
- goto out_err;
- }
-
- dev->ifindex = dev_new_index();
- if (dev->iflink == -1)
- dev->iflink = dev->ifindex;
-
- /* Check for existence of name */
- head = dev_name_hash(dev->name);
- hlist_for_each(p, head) {
- struct net_device *d
- = hlist_entry(p, struct net_device, name_hlist);
- if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
- ret = -EEXIST;
- goto out_err;
- }
- }
-
- /* Fix illegal SG+CSUM combinations. */
- if ((dev->features & NETIF_F_SG) &&
- !(dev->features & NETIF_F_ALL_CSUM)) {
- printk("%s: Dropping NETIF_F_SG since no checksum feature.\n",
- dev->name);
- dev->features &= ~NETIF_F_SG;
- }
-
- /* TSO requires that SG is present as well. */
- if ((dev->features & NETIF_F_TSO) &&
- !(dev->features & NETIF_F_SG)) {
- printk("%s: Dropping NETIF_F_TSO since no SG feature.\n",
- dev->name);
- dev->features &= ~NETIF_F_TSO;
- }
- if (dev->features & NETIF_F_UFO) {
- if (!(dev->features & NETIF_F_HW_CSUM)) {
- printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
- "NETIF_F_HW_CSUM feature.\n",
- dev->name);
- dev->features &= ~NETIF_F_UFO;
- }
- if (!(dev->features & NETIF_F_SG)) {
- printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
- "NETIF_F_SG feature.\n",
- dev->name);
- dev->features &= ~NETIF_F_UFO;
- }
- }
-
- /*
- * nil rebuild_header routine,
- * that should be never called and used as just bug trap.
- */
-
- if (!dev->rebuild_header)
- dev->rebuild_header = default_rebuild_header;
-
- ret = netdev_register_sysfs(dev);
- if (ret)
- goto out_err;
- dev->reg_state = NETREG_REGISTERED;
-
- /*
- * Default initial state at registry is that the
- * device is present.
- */
-
- set_bit(__LINK_STATE_PRESENT, &dev->state);
-
- dev->next = NULL;
- dev_init_scheduler(dev);
- write_lock_bh(&dev_base_lock);
- *dev_tail = dev;
- dev_tail = &dev->next;
- hlist_add_head(&dev->name_hlist, head);
- hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
- dev_hold(dev);
- write_unlock_bh(&dev_base_lock);
-
- /* Notify protocols, that a new device appeared. */
- raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
-
- ret = 0;
-
-out:
- return ret;
-out_err:
- free_divert_blk(dev);
- goto out;
-}
-
-/**
- * register_netdev - register a network device
- * @dev: device to register
- *
- * Take a completed network device structure and add it to the kernel
- * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
- * chain. 0 is returned on success. A negative errno code is returned
- * on a failure to set up the device, or if the name is a duplicate.
- *
- * This is a wrapper around register_netdev that takes the rtnl semaphore
- * and expands the device name if you passed a format string to
- * alloc_netdev.
- */
-int register_netdev(struct net_device *dev)
-{
- int err;
-
- rtnl_lock();
-
- /*
- * If the name is a format string the caller wants us to do a
- * name allocation.
- */
- if (strchr(dev->name, '%')) {
- err = dev_alloc_name(dev, dev->name);
- if (err < 0)
- goto out;
- }
-
- /*
- * Back compatibility hook. Kill this one in 2.5
- */
- if (dev->name[0] == 0 || dev->name[0] == ' ') {
- err = dev_alloc_name(dev, "eth%d");
- if (err < 0)
- goto out;
- }
-
- err = register_netdevice(dev);
-out:
- rtnl_unlock();
- return err;
-}
-EXPORT_SYMBOL(register_netdev);
-
-/*
- * netdev_wait_allrefs - wait until all references are gone.
- *
- * This is called when unregistering network devices.
- *
- * Any protocol or device that holds a reference should register
- * for netdevice notification, and cleanup and put back the
- * reference if they receive an UNREGISTER event.
- * We can get stuck here if buggy protocols don't correctly
- * call dev_put.
- */
-static void netdev_wait_allrefs(struct net_device *dev)
-{
- unsigned long rebroadcast_time, warning_time;
-
- rebroadcast_time = warning_time = jiffies;
- while (atomic_read(&dev->refcnt) != 0) {
- if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
- rtnl_lock();
-
- /* Rebroadcast unregister notification */
- raw_notifier_call_chain(&netdev_chain,
- NETDEV_UNREGISTER, dev);
-
- if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
- &dev->state)) {
- /* We must not have linkwatch events
- * pending on unregister. If this
- * happens, we simply run the queue
- * unscheduled, resulting in a noop
- * for this device.
- */
- linkwatch_run_queue();
- }
-
- __rtnl_unlock();
-
- rebroadcast_time = jiffies;
- }
-
- msleep(250);
-
- if (time_after(jiffies, warning_time + 10 * HZ)) {
- printk(KERN_EMERG "unregister_netdevice: "
- "waiting for %s to become free. Usage "
- "count = %d\n",
- dev->name, atomic_read(&dev->refcnt));
- warning_time = jiffies;
- }
- }
-}
-
-/* The sequence is:
- *
- * rtnl_lock();
- * ...
- * register_netdevice(x1);
- * register_netdevice(x2);
- * ...
- * unregister_netdevice(y1);
- * unregister_netdevice(y2);
- * ...
- * rtnl_unlock();
- * free_netdev(y1);
- * free_netdev(y2);
- *
- * We are invoked by rtnl_unlock() after it drops the semaphore.
- * This allows us to deal with problems:
- * 1) We can delete sysfs objects which invoke hotplug
- * without deadlocking with linkwatch via keventd.
- * 2) Since we run with the RTNL semaphore not held, we can sleep
- * safely in order to wait for the netdev refcnt to drop to zero.
- */
-static DEFINE_MUTEX(net_todo_run_mutex);
-void netdev_run_todo(void)
-{
- struct list_head list = LIST_HEAD_INIT(list);
-
- /* Need to guard against multiple cpu's getting out of order. */
- mutex_lock(&net_todo_run_mutex);
-
- /* Not safe to do outside the semaphore. We must not return
- * until all unregister events invoked by the local processor
- * have been completed (either by this todo run, or one on
- * another cpu).
- */
- if (list_empty(&net_todo_list))
- goto out;
-
- /* Snapshot list, allow later requests */
- spin_lock(&net_todo_list_lock);
- list_splice_init(&net_todo_list, &list);
- spin_unlock(&net_todo_list_lock);
-
- while (!list_empty(&list)) {
- struct net_device *dev
- = list_entry(list.next, struct net_device, todo_list);
- list_del(&dev->todo_list);
-
- if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
- printk(KERN_ERR "network todo '%s' but state %d\n",
- dev->name, dev->reg_state);
- dump_stack();
- continue;
- }
-
- netdev_unregister_sysfs(dev);
- dev->reg_state = NETREG_UNREGISTERED;
-
- netdev_wait_allrefs(dev);
-
- /* paranoia */
- BUG_ON(atomic_read(&dev->refcnt));
- BUG_TRAP(!dev->ip_ptr);
- BUG_TRAP(!dev->ip6_ptr);
- BUG_TRAP(!dev->dn_ptr);
-
- /* It must be the very last action,
- * after this 'dev' may point to freed up memory.
- */
- if (dev->destructor)
- dev->destructor(dev);
- }
-
-out:
- mutex_unlock(&net_todo_run_mutex);
-}
-
-/**
- * alloc_netdev - allocate network device
- * @sizeof_priv: size of private data to allocate space for
- * @name: device name format string
- * @setup: callback to initialize device
- *
- * Allocates a struct net_device with private data area for driver use
- * and performs basic initialization.
- */
-struct net_device *alloc_netdev(int sizeof_priv, const char *name,
- void (*setup)(struct net_device *))
-{
- void *p;
- struct net_device *dev;
- int alloc_size;
-
- /* ensure 32-byte alignment of both the device and private area */
- alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
- alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
-
- p = kzalloc(alloc_size, GFP_KERNEL);
- if (!p) {
- printk(KERN_ERR "alloc_dev: Unable to allocate device.\n");
- return NULL;
- }
-
- dev = (struct net_device *)
- (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
- dev->padded = (char *)dev - (char *)p;
-
- if (sizeof_priv)
- dev->priv = netdev_priv(dev);
-
- setup(dev);
- strcpy(dev->name, name);
- return dev;
-}
-EXPORT_SYMBOL(alloc_netdev);
-
-/**
- * free_netdev - free network device
- * @dev: device
- *
- * This function does the last stage of destroying an allocated device
- * interface. The reference to the device object is released.
- * If this is the last reference then it will be freed.
- */
-void free_netdev(struct net_device *dev)
-{
-#ifdef CONFIG_SYSFS
- /* Compatibility with error handling in drivers */
- if (dev->reg_state == NETREG_UNINITIALIZED) {
- kfree((char *)dev - dev->padded);
- return;
- }
-
- BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
- dev->reg_state = NETREG_RELEASED;
-
- /* will free via class release */
- class_device_put(&dev->class_dev);
-#else
- kfree((char *)dev - dev->padded);
-#endif
-}
-
-/* Synchronize with packet receive processing. */
-void synchronize_net(void)
-{
- might_sleep();
- synchronize_rcu();
-}
-
-/**
- * unregister_netdevice - remove device from the kernel
- * @dev: device
- *
- * This function shuts down a device interface and removes it
- * from the kernel tables. On success 0 is returned, on a failure
- * a negative errno code is returned.
- *
- * Callers must hold the rtnl semaphore. You may want
- * unregister_netdev() instead of this.
- */
-
-int unregister_netdevice(struct net_device *dev)
-{
- struct net_device *d, **dp;
-
- BUG_ON(dev_boot_phase);
- ASSERT_RTNL();
-
- /* Some devices call without registering for initialization unwind. */
- if (dev->reg_state == NETREG_UNINITIALIZED) {
- printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
- "was registered\n", dev->name, dev);
- return -ENODEV;
- }
-
- BUG_ON(dev->reg_state != NETREG_REGISTERED);
-
- /* If device is running, close it first. */
- if (dev->flags & IFF_UP)
- dev_close(dev);
-
- /* And unlink it from device chain. */
- for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) {
- if (d == dev) {
- write_lock_bh(&dev_base_lock);
- hlist_del(&dev->name_hlist);
- hlist_del(&dev->index_hlist);
- if (dev_tail == &dev->next)
- dev_tail = dp;
- *dp = d->next;
- write_unlock_bh(&dev_base_lock);
- break;
- }
- }
- if (!d) {
- printk(KERN_ERR "unregister net_device: '%s' not found\n",
- dev->name);
- return -ENODEV;
- }
-
- dev->reg_state = NETREG_UNREGISTERING;
-
- synchronize_net();
-
- /* Shutdown queueing discipline. */
- dev_shutdown(dev);
-
-
- /* Notify protocols, that we are about to destroy
- this device. They should clean all the things.
- */
- raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
-
- /*
- * Flush the multicast chain
- */
- dev_mc_discard(dev);
-
- if (dev->uninit)
- dev->uninit(dev);
-
- /* Notifier chain MUST detach us from master device. */
- BUG_TRAP(!dev->master);
-
- free_divert_blk(dev);
-
- /* Finish processing unregister after unlock */
- net_set_todo(dev);
-
- synchronize_net();
-
- dev_put(dev);
- return 0;
-}
-
-/**
- * unregister_netdev - remove device from the kernel
- * @dev: device
- *
- * This function shuts down a device interface and removes it
- * from the kernel tables. On success 0 is returned, on a failure
- * a negative errno code is returned.
- *
- * This is just a wrapper for unregister_netdevice that takes
- * the rtnl semaphore. In general you want to use this and not
- * unregister_netdevice.
- */
-void unregister_netdev(struct net_device *dev)
-{
- rtnl_lock();
- unregister_netdevice(dev);
- rtnl_unlock();
-}
-
-EXPORT_SYMBOL(unregister_netdev);
-
-#ifdef CONFIG_HOTPLUG_CPU
-static int dev_cpu_callback(struct notifier_block *nfb,
- unsigned long action,
- void *ocpu)
-{
- struct sk_buff **list_skb;
- struct net_device **list_net;
- struct sk_buff *skb;
- unsigned int cpu, oldcpu = (unsigned long)ocpu;
- struct softnet_data *sd, *oldsd;
-
- if (action != CPU_DEAD)
- return NOTIFY_OK;
-
- local_irq_disable();
- cpu = smp_processor_id();
- sd = &per_cpu(softnet_data, cpu);
- oldsd = &per_cpu(softnet_data, oldcpu);
-
- /* Find end of our completion_queue. */
- list_skb = &sd->completion_queue;
- while (*list_skb)
- list_skb = &(*list_skb)->next;
- /* Append completion queue from offline CPU. */
- *list_skb = oldsd->completion_queue;
- oldsd->completion_queue = NULL;
-
- /* Find end of our output_queue. */
- list_net = &sd->output_queue;
- while (*list_net)
- list_net = &(*list_net)->next_sched;
- /* Append output queue from offline CPU. */
- *list_net = oldsd->output_queue;
- oldsd->output_queue = NULL;
-
- raise_softirq_irqoff(NET_TX_SOFTIRQ);
- local_irq_enable();
-
- /* Process offline CPU's input_pkt_queue */
- while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
- netif_rx(skb);
-
- return NOTIFY_OK;
-}
-#endif /* CONFIG_HOTPLUG_CPU */
-
-
-/*
- * Initialize the DEV module. At boot time this walks the device list and
- * unhooks any devices that fail to initialise (normally hardware not
- * present) and leaves us with a valid list of present and active devices.
- *
- */
-
-/*
- * This is called single threaded during boot, so no need
- * to take the rtnl semaphore.
- */
-static int __init net_dev_init(void)
-{
- int i, rc = -ENOMEM;
-
- BUG_ON(!dev_boot_phase);
-
- net_random_init();
-
- if (dev_proc_init())
- goto out;
-
- if (netdev_sysfs_init())
- goto out;
-
- INIT_LIST_HEAD(&ptype_all);
- for (i = 0; i < 16; i++)
- INIT_LIST_HEAD(&ptype_base[i]);
-
- for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
- INIT_HLIST_HEAD(&dev_name_head[i]);
-
- for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
- INIT_HLIST_HEAD(&dev_index_head[i]);
-
- /*
- * Initialise the packet receive queues.
- */
-
- for_each_possible_cpu(i) {
- struct softnet_data *queue;
-
- queue = &per_cpu(softnet_data, i);
- skb_queue_head_init(&queue->input_pkt_queue);
- queue->completion_queue = NULL;
- INIT_LIST_HEAD(&queue->poll_list);
- set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
- queue->backlog_dev.weight = weight_p;
- queue->backlog_dev.poll = process_backlog;
- atomic_set(&queue->backlog_dev.refcnt, 1);
- }
-
- dev_boot_phase = 0;
-
- open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
- open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
-
- hotcpu_notifier(dev_cpu_callback, 0);
- dst_init();
- dev_mcast_init();
- rc = 0;
-out:
- return rc;
-}
-
-subsys_initcall(net_dev_init);
-
-EXPORT_SYMBOL(__dev_get_by_index);
-EXPORT_SYMBOL(__dev_get_by_name);
-EXPORT_SYMBOL(__dev_remove_pack);
-EXPORT_SYMBOL(dev_valid_name);
-EXPORT_SYMBOL(dev_add_pack);
-EXPORT_SYMBOL(dev_alloc_name);
-EXPORT_SYMBOL(dev_close);
-EXPORT_SYMBOL(dev_get_by_flags);
-EXPORT_SYMBOL(dev_get_by_index);
-EXPORT_SYMBOL(dev_get_by_name);
-EXPORT_SYMBOL(dev_open);
-EXPORT_SYMBOL(dev_queue_xmit);
-EXPORT_SYMBOL(dev_remove_pack);
-EXPORT_SYMBOL(dev_set_allmulti);
-EXPORT_SYMBOL(dev_set_promiscuity);
-EXPORT_SYMBOL(dev_change_flags);
-EXPORT_SYMBOL(dev_set_mtu);
-EXPORT_SYMBOL(dev_set_mac_address);
-EXPORT_SYMBOL(free_netdev);
-EXPORT_SYMBOL(netdev_boot_setup_check);
-EXPORT_SYMBOL(netdev_set_master);
-EXPORT_SYMBOL(netdev_state_change);
-EXPORT_SYMBOL(netif_receive_skb);
-EXPORT_SYMBOL(netif_rx);
-EXPORT_SYMBOL(register_gifconf);
-EXPORT_SYMBOL(register_netdevice);
-EXPORT_SYMBOL(register_netdevice_notifier);
-EXPORT_SYMBOL(skb_checksum_help);
-EXPORT_SYMBOL(synchronize_net);
-EXPORT_SYMBOL(unregister_netdevice);
-EXPORT_SYMBOL(unregister_netdevice_notifier);
-EXPORT_SYMBOL(net_enable_timestamp);
-EXPORT_SYMBOL(net_disable_timestamp);
-EXPORT_SYMBOL(dev_get_flags);
-EXPORT_SYMBOL(skb_checksum_setup);
-
-#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-EXPORT_SYMBOL(br_handle_frame_hook);
-EXPORT_SYMBOL(br_fdb_get_hook);
-EXPORT_SYMBOL(br_fdb_put_hook);
-#endif
-
-#ifdef CONFIG_KMOD
-EXPORT_SYMBOL(dev_load);
-#endif
-
-EXPORT_PER_CPU_SYMBOL(softnet_data);
+++ /dev/null
-/*
- * INET An implementation of the TCP/IP protocol suite for the LINUX
- * operating system. INET is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * Implementation of the Transmission Control Protocol(TCP).
- *
- * Version: $Id: tcp.c,v 1.216 2002/02/01 22:01:04 davem Exp $
- *
- * Authors: Ross Biro
- * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
- * Mark Evans, <evansmp@uhura.aston.ac.uk>
- * Corey Minyard <wf-rch!minyard@relay.EU.net>
- * Florian La Roche, <flla@stud.uni-sb.de>
- * Charles Hedrick, <hedrick@klinzhai.rutgers.edu>
- * Linus Torvalds, <torvalds@cs.helsinki.fi>
- * Alan Cox, <gw4pts@gw4pts.ampr.org>
- * Matthew Dillon, <dillon@apollo.west.oic.com>
- * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
- * Jorge Cwik, <jorge@laser.satlink.net>
- *
- * Fixes:
- * Alan Cox : Numerous verify_area() calls
- * Alan Cox : Set the ACK bit on a reset
- * Alan Cox : Stopped it crashing if it closed while
- * sk->inuse=1 and was trying to connect
- * (tcp_err()).
- * Alan Cox : All icmp error handling was broken
- * pointers passed where wrong and the
- * socket was looked up backwards. Nobody
- * tested any icmp error code obviously.
- * Alan Cox : tcp_err() now handled properly. It
- * wakes people on errors. poll
- * behaves and the icmp error race
- * has gone by moving it into sock.c
- * Alan Cox : tcp_send_reset() fixed to work for
- * everything not just packets for
- * unknown sockets.
- * Alan Cox : tcp option processing.
- * Alan Cox : Reset tweaked (still not 100%) [Had
- * syn rule wrong]
- * Herp Rosmanith : More reset fixes
- * Alan Cox : No longer acks invalid rst frames.
- * Acking any kind of RST is right out.
- * Alan Cox : Sets an ignore me flag on an rst
- * receive otherwise odd bits of prattle
- * escape still
- * Alan Cox : Fixed another acking RST frame bug.
- * Should stop LAN workplace lockups.
- * Alan Cox : Some tidyups using the new skb list
- * facilities
- * Alan Cox : sk->keepopen now seems to work
- * Alan Cox : Pulls options out correctly on accepts
- * Alan Cox : Fixed assorted sk->rqueue->next errors
- * Alan Cox : PSH doesn't end a TCP read. Switched a
- * bit to skb ops.
- * Alan Cox : Tidied tcp_data to avoid a potential
- * nasty.
- * Alan Cox : Added some better commenting, as the
- * tcp is hard to follow
- * Alan Cox : Removed incorrect check for 20 * psh
- * Michael O'Reilly : ack < copied bug fix.
- * Johannes Stille : Misc tcp fixes (not all in yet).
- * Alan Cox : FIN with no memory -> CRASH
- * Alan Cox : Added socket option proto entries.
- * Also added awareness of them to accept.
- * Alan Cox : Added TCP options (SOL_TCP)
- * Alan Cox : Switched wakeup calls to callbacks,
- * so the kernel can layer network
- * sockets.
- * Alan Cox : Use ip_tos/ip_ttl settings.
- * Alan Cox : Handle FIN (more) properly (we hope).
- * Alan Cox : RST frames sent on unsynchronised
- * state ack error.
- * Alan Cox : Put in missing check for SYN bit.
- * Alan Cox : Added tcp_select_window() aka NET2E
- * window non shrink trick.
- * Alan Cox : Added a couple of small NET2E timer
- * fixes
- * Charles Hedrick : TCP fixes
- * Toomas Tamm : TCP window fixes
- * Alan Cox : Small URG fix to rlogin ^C ack fight
- * Charles Hedrick : Rewrote most of it to actually work
- * Linus : Rewrote tcp_read() and URG handling
- * completely
- * Gerhard Koerting: Fixed some missing timer handling
- * Matthew Dillon : Reworked TCP machine states as per RFC
- * Gerhard Koerting: PC/TCP workarounds
- * Adam Caldwell : Assorted timer/timing errors
- * Matthew Dillon : Fixed another RST bug
- * Alan Cox : Move to kernel side addressing changes.
- * Alan Cox : Beginning work on TCP fastpathing
- * (not yet usable)
- * Arnt Gulbrandsen: Turbocharged tcp_check() routine.
- * Alan Cox : TCP fast path debugging
- * Alan Cox : Window clamping
- * Michael Riepe : Bug in tcp_check()
- * Matt Dillon : More TCP improvements and RST bug fixes
- * Matt Dillon : Yet more small nasties remove from the
- * TCP code (Be very nice to this man if
- * tcp finally works 100%) 8)
- * Alan Cox : BSD accept semantics.
- * Alan Cox : Reset on closedown bug.
- * Peter De Schrijver : ENOTCONN check missing in tcp_sendto().
- * Michael Pall : Handle poll() after URG properly in
- * all cases.
- * Michael Pall : Undo the last fix in tcp_read_urg()
- * (multi URG PUSH broke rlogin).
- * Michael Pall : Fix the multi URG PUSH problem in
- * tcp_readable(), poll() after URG
- * works now.
- * Michael Pall : recv(...,MSG_OOB) never blocks in the
- * BSD api.
- * Alan Cox : Changed the semantics of sk->socket to
- * fix a race and a signal problem with
- * accept() and async I/O.
- * Alan Cox : Relaxed the rules on tcp_sendto().
- * Yury Shevchuk : Really fixed accept() blocking problem.
- * Craig I. Hagan : Allow for BSD compatible TIME_WAIT for
- * clients/servers which listen in on
- * fixed ports.
- * Alan Cox : Cleaned the above up and shrank it to
- * a sensible code size.
- * Alan Cox : Self connect lockup fix.
- * Alan Cox : No connect to multicast.
- * Ross Biro : Close unaccepted children on master
- * socket close.
- * Alan Cox : Reset tracing code.
- * Alan Cox : Spurious resets on shutdown.
- * Alan Cox : Giant 15 minute/60 second timer error
- * Alan Cox : Small whoops in polling before an
- * accept.
- * Alan Cox : Kept the state trace facility since
- * it's handy for debugging.
- * Alan Cox : More reset handler fixes.
- * Alan Cox : Started rewriting the code based on
- * the RFC's for other useful protocol
- * references see: Comer, KA9Q NOS, and
- * for a reference on the difference
- * between specifications and how BSD
- * works see the 4.4lite source.
- * A.N.Kuznetsov : Don't time wait on completion of tidy
- * close.
- * Linus Torvalds : Fin/Shutdown & copied_seq changes.
- * Linus Torvalds : Fixed BSD port reuse to work first syn
- * Alan Cox : Reimplemented timers as per the RFC
- * and using multiple timers for sanity.
- * Alan Cox : Small bug fixes, and a lot of new
- * comments.
- * Alan Cox : Fixed dual reader crash by locking
- * the buffers (much like datagram.c)
- * Alan Cox : Fixed stuck sockets in probe. A probe
- * now gets fed up of retrying without
- * (even a no space) answer.
- * Alan Cox : Extracted closing code better
- * Alan Cox : Fixed the closing state machine to
- * resemble the RFC.
- * Alan Cox : More 'per spec' fixes.
- * Jorge Cwik : Even faster checksumming.
- * Alan Cox : tcp_data() doesn't ack illegal PSH
- * only frames. At least one pc tcp stack
- * generates them.
- * Alan Cox : Cache last socket.
- * Alan Cox : Per route irtt.
- * Matt Day : poll()->select() match BSD precisely on error
- * Alan Cox : New buffers
- * Marc Tamsky : Various sk->prot->retransmits and
- * sk->retransmits misupdating fixed.
- * Fixed tcp_write_timeout: stuck close,
- * and TCP syn retries gets used now.
- * Mark Yarvis : In tcp_read_wakeup(), don't send an
- * ack if state is TCP_CLOSED.
- * Alan Cox : Look up device on a retransmit - routes may
- * change. Doesn't yet cope with MSS shrink right
- * but it's a start!
- * Marc Tamsky : Closing in closing fixes.
- * Mike Shaver : RFC1122 verifications.
- * Alan Cox : rcv_saddr errors.
- * Alan Cox : Block double connect().
- * Alan Cox : Small hooks for enSKIP.
- * Alexey Kuznetsov: Path MTU discovery.
- * Alan Cox : Support soft errors.
- * Alan Cox : Fix MTU discovery pathological case
- * when the remote claims no mtu!
- * Marc Tamsky : TCP_CLOSE fix.
- * Colin (G3TNE) : Send a reset on syn ack replies in
- * window but wrong (fixes NT lpd problems)
- * Pedro Roque : Better TCP window handling, delayed ack.
- * Joerg Reuter : No modification of locked buffers in
- * tcp_do_retransmit()
- * Eric Schenk : Changed receiver side silly window
- * avoidance algorithm to BSD style
- * algorithm. This doubles throughput
- * against machines running Solaris,
- * and seems to result in general
- * improvement.
- * Stefan Magdalinski : adjusted tcp_readable() to fix FIONREAD
- * Willy Konynenberg : Transparent proxying support.
- * Mike McLagan : Routing by source
- * Keith Owens : Do proper merging with partial SKB's in
- * tcp_do_sendmsg to avoid burstiness.
- * Eric Schenk : Fix fast close down bug with
- * shutdown() followed by close().
- * Andi Kleen : Make poll agree with SIGIO
- * Salvatore Sanfilippo : Support SO_LINGER with linger == 1 and
- * lingertime == 0 (RFC 793 ABORT Call)
- * Hirokazu Takahashi : Use copy_from_user() instead of
- * csum_and_copy_from_user() if possible.
- *
- * 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.
- *
- * Description of States:
- *
- * TCP_SYN_SENT sent a connection request, waiting for ack
- *
- * TCP_SYN_RECV received a connection request, sent ack,
- * waiting for final ack in three-way handshake.
- *
- * TCP_ESTABLISHED connection established
- *
- * TCP_FIN_WAIT1 our side has shutdown, waiting to complete
- * transmission of remaining buffered data
- *
- * TCP_FIN_WAIT2 all buffered data sent, waiting for remote
- * to shutdown
- *
- * TCP_CLOSING both sides have shutdown but we still have
- * data we have to finish sending
- *
- * TCP_TIME_WAIT timeout to catch resent junk before entering
- * closed, can only be entered from FIN_WAIT2
- * or CLOSING. Required because the other end
- * may not have gotten our last ACK causing it
- * to retransmit the data packet (which we ignore)
- *
- * TCP_CLOSE_WAIT remote side has shutdown and is waiting for
- * us to finish writing our data and to shutdown
- * (we have to close() to move on to LAST_ACK)
- *
- * TCP_LAST_ACK out side has shutdown after remote has
- * shutdown. There may still be data in our
- * buffer that we have to finish sending
- *
- * TCP_CLOSE socket is finished
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/fcntl.h>
-#include <linux/poll.h>
-#include <linux/init.h>
-#include <linux/smp_lock.h>
-#include <linux/fs.h>
-#include <linux/random.h>
-#include <linux/bootmem.h>
-#include <linux/cache.h>
-#include <linux/err.h>
-
-#include <net/icmp.h>
-#include <net/tcp.h>
-#include <net/xfrm.h>
-#include <net/ip.h>
-
-
-#include <asm/uaccess.h>
-#include <asm/ioctls.h>
-
-int sysctl_tcp_fin_timeout = TCP_FIN_TIMEOUT;
-
-DEFINE_SNMP_STAT(struct tcp_mib, tcp_statistics) __read_mostly;
-
-atomic_t tcp_orphan_count = ATOMIC_INIT(0);
-
-EXPORT_SYMBOL_GPL(tcp_orphan_count);
-
-int sysctl_tcp_mem[3] __read_mostly;
-int sysctl_tcp_wmem[3] __read_mostly;
-int sysctl_tcp_rmem[3] __read_mostly;
-
-EXPORT_SYMBOL(sysctl_tcp_mem);
-EXPORT_SYMBOL(sysctl_tcp_rmem);
-EXPORT_SYMBOL(sysctl_tcp_wmem);
-
-atomic_t tcp_memory_allocated; /* Current allocated memory. */
-atomic_t tcp_sockets_allocated; /* Current number of TCP sockets. */
-
-EXPORT_SYMBOL(tcp_memory_allocated);
-EXPORT_SYMBOL(tcp_sockets_allocated);
-
-/*
- * Pressure flag: try to collapse.
- * Technical note: it is used by multiple contexts non atomically.
- * All the sk_stream_mem_schedule() is of this nature: accounting
- * is strict, actions are advisory and have some latency.
- */
-int tcp_memory_pressure;
-
-EXPORT_SYMBOL(tcp_memory_pressure);
-
-void tcp_enter_memory_pressure(void)
-{
- if (!tcp_memory_pressure) {
- NET_INC_STATS(LINUX_MIB_TCPMEMORYPRESSURES);
- tcp_memory_pressure = 1;
- }
-}
-
-EXPORT_SYMBOL(tcp_enter_memory_pressure);
-
-/*
- * Wait for a TCP event.
- *
- * Note that we don't need to lock the socket, as the upper poll layers
- * take care of normal races (between the test and the event) and we don't
- * go look at any of the socket buffers directly.
- */
-unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
-{
- unsigned int mask;
- struct sock *sk = sock->sk;
- struct tcp_sock *tp = tcp_sk(sk);
-
- poll_wait(file, sk->sk_sleep, wait);
- if (sk->sk_state == TCP_LISTEN)
- return inet_csk_listen_poll(sk);
-
- /* Socket is not locked. We are protected from async events
- by poll logic and correct handling of state changes
- made by another threads is impossible in any case.
- */
-
- mask = 0;
- if (sk->sk_err)
- mask = POLLERR;
-
- /*
- * POLLHUP is certainly not done right. But poll() doesn't
- * have a notion of HUP in just one direction, and for a
- * socket the read side is more interesting.
- *
- * Some poll() documentation says that POLLHUP is incompatible
- * with the POLLOUT/POLLWR flags, so somebody should check this
- * all. But careful, it tends to be safer to return too many
- * bits than too few, and you can easily break real applications
- * if you don't tell them that something has hung up!
- *
- * Check-me.
- *
- * Check number 1. POLLHUP is _UNMASKABLE_ event (see UNIX98 and
- * our fs/select.c). It means that after we received EOF,
- * poll always returns immediately, making impossible poll() on write()
- * in state CLOSE_WAIT. One solution is evident --- to set POLLHUP
- * if and only if shutdown has been made in both directions.
- * Actually, it is interesting to look how Solaris and DUX
- * solve this dilemma. I would prefer, if PULLHUP were maskable,
- * then we could set it on SND_SHUTDOWN. BTW examples given
- * in Stevens' books assume exactly this behaviour, it explains
- * why PULLHUP is incompatible with POLLOUT. --ANK
- *
- * NOTE. Check for TCP_CLOSE is added. The goal is to prevent
- * blocking on fresh not-connected or disconnected socket. --ANK
- */
- if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == TCP_CLOSE)
- mask |= POLLHUP;
- if (sk->sk_shutdown & RCV_SHUTDOWN)
- mask |= POLLIN | POLLRDNORM | POLLRDHUP;
-
- /* Connected? */
- if ((1 << sk->sk_state) & ~(TCPF_SYN_SENT | TCPF_SYN_RECV)) {
- /* Potential race condition. If read of tp below will
- * escape above sk->sk_state, we can be illegally awaken
- * in SYN_* states. */
- if ((tp->rcv_nxt != tp->copied_seq) &&
- (tp->urg_seq != tp->copied_seq ||
- tp->rcv_nxt != tp->copied_seq + 1 ||
- sock_flag(sk, SOCK_URGINLINE) || !tp->urg_data))
- mask |= POLLIN | POLLRDNORM;
-
- if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
- if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
- mask |= POLLOUT | POLLWRNORM;
- } else { /* send SIGIO later */
- set_bit(SOCK_ASYNC_NOSPACE,
- &sk->sk_socket->flags);
- set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
-
- /* Race breaker. If space is freed after
- * wspace test but before the flags are set,
- * IO signal will be lost.
- */
- if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
- mask |= POLLOUT | POLLWRNORM;
- }
- }
-
- if (tp->urg_data & TCP_URG_VALID)
- mask |= POLLPRI;
- }
- return mask;
-}
-
-int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg)
-{
- struct tcp_sock *tp = tcp_sk(sk);
- int answ;
-
- switch (cmd) {
- case SIOCINQ:
- if (sk->sk_state == TCP_LISTEN)
- return -EINVAL;
-
- lock_sock(sk);
- if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))
- answ = 0;
- else if (sock_flag(sk, SOCK_URGINLINE) ||
- !tp->urg_data ||
- before(tp->urg_seq, tp->copied_seq) ||
- !before(tp->urg_seq, tp->rcv_nxt)) {
- answ = tp->rcv_nxt - tp->copied_seq;
-
- /* Subtract 1, if FIN is in queue. */
- if (answ && !skb_queue_empty(&sk->sk_receive_queue))
- answ -=
- ((struct sk_buff *)sk->sk_receive_queue.prev)->h.th->fin;
- } else
- answ = tp->urg_seq - tp->copied_seq;
- release_sock(sk);
- break;
- case SIOCATMARK:
- answ = tp->urg_data && tp->urg_seq == tp->copied_seq;
- break;
- case SIOCOUTQ:
- if (sk->sk_state == TCP_LISTEN)
- return -EINVAL;
-
- if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV))
- answ = 0;
- else
- answ = tp->write_seq - tp->snd_una;
- break;
- default:
- return -ENOIOCTLCMD;
- };
-
- return put_user(answ, (int __user *)arg);
-}
-
-static inline void tcp_mark_push(struct tcp_sock *tp, struct sk_buff *skb)
-{
- TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_PSH;
- tp->pushed_seq = tp->write_seq;
-}
-
-static inline int forced_push(struct tcp_sock *tp)
-{
- return after(tp->write_seq, tp->pushed_seq + (tp->max_window >> 1));
-}
-
-static inline void skb_entail(struct sock *sk, struct tcp_sock *tp,
- struct sk_buff *skb)
-{
- skb->csum = 0;
- TCP_SKB_CB(skb)->seq = tp->write_seq;
- TCP_SKB_CB(skb)->end_seq = tp->write_seq;
- TCP_SKB_CB(skb)->flags = TCPCB_FLAG_ACK;
- TCP_SKB_CB(skb)->sacked = 0;
- skb_header_release(skb);
- __skb_queue_tail(&sk->sk_write_queue, skb);
- sk_charge_skb(sk, skb);
- if (!sk->sk_send_head)
- sk->sk_send_head = skb;
- if (tp->nonagle & TCP_NAGLE_PUSH)
- tp->nonagle &= ~TCP_NAGLE_PUSH;
-}
-
-static inline void tcp_mark_urg(struct tcp_sock *tp, int flags,
- struct sk_buff *skb)
-{
- if (flags & MSG_OOB) {
- tp->urg_mode = 1;
- tp->snd_up = tp->write_seq;
- TCP_SKB_CB(skb)->sacked |= TCPCB_URG;
- }
-}
-
-static inline void tcp_push(struct sock *sk, struct tcp_sock *tp, int flags,
- int mss_now, int nonagle)
-{
- if (sk->sk_send_head) {
- struct sk_buff *skb = sk->sk_write_queue.prev;
- if (!(flags & MSG_MORE) || forced_push(tp))
- tcp_mark_push(tp, skb);
- tcp_mark_urg(tp, flags, skb);
- __tcp_push_pending_frames(sk, tp, mss_now,
- (flags & MSG_MORE) ? TCP_NAGLE_CORK : nonagle);
- }
-}
-
-static ssize_t do_tcp_sendpages(struct sock *sk, struct page **pages, int poffset,
- size_t psize, int flags)
-{
- struct tcp_sock *tp = tcp_sk(sk);
- int mss_now, size_goal;
- int err;
- ssize_t copied;
- long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
-
- /* Wait for a connection to finish. */
- if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))
- if ((err = sk_stream_wait_connect(sk, &timeo)) != 0)
- goto out_err;
-
- clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
-
- mss_now = tcp_current_mss(sk, !(flags&MSG_OOB));
- size_goal = tp->xmit_size_goal;
- copied = 0;
-
- err = -EPIPE;
- if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
- goto do_error;
-
- while (psize > 0) {
- struct sk_buff *skb = sk->sk_write_queue.prev;
- struct page *page = pages[poffset / PAGE_SIZE];
- int copy, i, can_coalesce;
- int offset = poffset % PAGE_SIZE;
- int size = min_t(size_t, psize, PAGE_SIZE - offset);
-
- if (!sk->sk_send_head || (copy = size_goal - skb->len) <= 0) {
-new_segment:
- if (!sk_stream_memory_free(sk))
- goto wait_for_sndbuf;
-
- skb = sk_stream_alloc_pskb(sk, 0, 0,
- sk->sk_allocation);
- if (!skb)
- goto wait_for_memory;
-
- skb_entail(sk, tp, skb);
- copy = size_goal;
- }
-
- if (copy > size)
- copy = size;
-
- i = skb_shinfo(skb)->nr_frags;
- can_coalesce = skb_can_coalesce(skb, i, page, offset);
- if (!can_coalesce && i >= MAX_SKB_FRAGS) {
- tcp_mark_push(tp, skb);
- goto new_segment;
- }
- if (!sk_stream_wmem_schedule(sk, copy))
- goto wait_for_memory;
-
- if (can_coalesce) {
- skb_shinfo(skb)->frags[i - 1].size += copy;
- } else {
- get_page(page);
- skb_fill_page_desc(skb, i, page, offset, copy);
- }
-
- skb->len += copy;
- skb->data_len += copy;
- skb->truesize += copy;
- sk->sk_wmem_queued += copy;
- sk->sk_forward_alloc -= copy;
- skb->ip_summed = CHECKSUM_HW;
- tp->write_seq += copy;
- TCP_SKB_CB(skb)->end_seq += copy;
- skb_shinfo(skb)->gso_segs = 0;
-
- if (!copied)
- TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_PSH;
-
- copied += copy;
- poffset += copy;
- if (!(psize -= copy))
- goto out;
-
- if (skb->len < mss_now || (flags & MSG_OOB))
- continue;
-
- if (forced_push(tp)) {
- tcp_mark_push(tp, skb);
- __tcp_push_pending_frames(sk, tp, mss_now, TCP_NAGLE_PUSH);
- } else if (skb == sk->sk_send_head)
- tcp_push_one(sk, mss_now);
- continue;
-
-wait_for_sndbuf:
- set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
-wait_for_memory:
- if (copied)
- tcp_push(sk, tp, flags & ~MSG_MORE, mss_now, TCP_NAGLE_PUSH);
-
- if ((err = sk_stream_wait_memory(sk, &timeo)) != 0)
- goto do_error;
-
- mss_now = tcp_current_mss(sk, !(flags&MSG_OOB));
- size_goal = tp->xmit_size_goal;
- }
-
-out:
- if (copied)
- tcp_push(sk, tp, flags, mss_now, tp->nonagle);
- return copied;
-
-do_error:
- if (copied)
- goto out;
-out_err:
- return sk_stream_error(sk, flags, err);
-}
-
-ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset,
- size_t size, int flags)
-{
- ssize_t res;
- struct sock *sk = sock->sk;
-
- if (!(sk->sk_route_caps & NETIF_F_SG) ||
- !(sk->sk_route_caps & NETIF_F_ALL_CSUM))
- return sock_no_sendpage(sock, page, offset, size, flags);
-
- lock_sock(sk);
- TCP_CHECK_TIMER(sk);
- res = do_tcp_sendpages(sk, &page, offset, size, flags);
- TCP_CHECK_TIMER(sk);
- release_sock(sk);
- return res;
-}
-
-#define TCP_PAGE(sk) (sk->sk_sndmsg_page)
-#define TCP_OFF(sk) (sk->sk_sndmsg_off)
-
-static inline int select_size(struct sock *sk, struct tcp_sock *tp)
-{
- int tmp = tp->mss_cache;
-
- if (sk->sk_route_caps & NETIF_F_SG) {
- if (sk->sk_route_caps & NETIF_F_TSO)
- tmp = 0;
- else {
- int pgbreak = SKB_MAX_HEAD(MAX_TCP_HEADER);
-
- if (tmp >= pgbreak &&
- tmp <= pgbreak + (MAX_SKB_FRAGS - 1) * PAGE_SIZE)
- tmp = pgbreak;
- }
- }
-
- return tmp;
-}
-
-int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
- size_t size)
-{
- struct iovec *iov;
- struct tcp_sock *tp = tcp_sk(sk);
- struct sk_buff *skb;
- int iovlen, flags;
- int mss_now, size_goal;
- int err, copied;
- long timeo;
-
- lock_sock(sk);
- TCP_CHECK_TIMER(sk);
-
- flags = msg->msg_flags;
- timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
-
- /* Wait for a connection to finish. */
- if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))
- if ((err = sk_stream_wait_connect(sk, &timeo)) != 0)
- goto out_err;
-
- /* This should be in poll */
- clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
-
- mss_now = tcp_current_mss(sk, !(flags&MSG_OOB));
- size_goal = tp->xmit_size_goal;
-
- /* Ok commence sending. */
- iovlen = msg->msg_iovlen;
- iov = msg->msg_iov;
- copied = 0;
-
- err = -EPIPE;
- if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
- goto do_error;
-
- while (--iovlen >= 0) {
- int seglen = iov->iov_len;
- unsigned char __user *from = iov->iov_base;
-
- iov++;
-
- while (seglen > 0) {
- int copy;
-
- skb = sk->sk_write_queue.prev;
-
- if (!sk->sk_send_head ||
- (copy = size_goal - skb->len) <= 0) {
-
-new_segment:
- /* Allocate new segment. If the interface is SG,
- * allocate skb fitting to single page.
- */
- if (!sk_stream_memory_free(sk))
- goto wait_for_sndbuf;
-
- skb = sk_stream_alloc_pskb(sk, select_size(sk, tp),
- 0, sk->sk_allocation);
- if (!skb)
- goto wait_for_memory;
-
- /*
- * Check whether we can use HW checksum.
- */
- if (sk->sk_route_caps & NETIF_F_ALL_CSUM)
- skb->ip_summed = CHECKSUM_HW;
-
- skb_entail(sk, tp, skb);
- copy = size_goal;
- }
-
- /* Try to append data to the end of skb. */
- if (copy > seglen)
- copy = seglen;
-
- /* Where to copy to? */
- if (skb_tailroom(skb) > 0) {
- /* We have some space in skb head. Superb! */
- if (copy > skb_tailroom(skb))
- copy = skb_tailroom(skb);
- if ((err = skb_add_data(skb, from, copy)) != 0)
- goto do_fault;
- } else {
- int merge = 0;
- int i = skb_shinfo(skb)->nr_frags;
- struct page *page = TCP_PAGE(sk);
- int off = TCP_OFF(sk);
-
- if (skb_can_coalesce(skb, i, page, off) &&
- off != PAGE_SIZE) {
- /* We can extend the last page
- * fragment. */
- merge = 1;
- } else if (i == MAX_SKB_FRAGS ||
- (!i &&
- !(sk->sk_route_caps & NETIF_F_SG))) {
- /* Need to add new fragment and cannot
- * do this because interface is non-SG,
- * or because all the page slots are
- * busy. */
- tcp_mark_push(tp, skb);
- goto new_segment;
- } else if (page) {
- if (off == PAGE_SIZE) {
- put_page(page);
- TCP_PAGE(sk) = page = NULL;
- off = 0;
- }
- } else
- off = 0;
-
- if (copy > PAGE_SIZE - off)
- copy = PAGE_SIZE - off;
-
- if (!sk_stream_wmem_schedule(sk, copy))
- goto wait_for_memory;
-
- if (!page) {
- /* Allocate new cache page. */
- if (!(page = sk_stream_alloc_page(sk)))
- goto wait_for_memory;
- }
-
- /* Time to copy data. We are close to
- * the end! */
- err = skb_copy_to_page(sk, from, skb, page,
- off, copy);
- if (err) {
- /* If this page was new, give it to the
- * socket so it does not get leaked.
- */
- if (!TCP_PAGE(sk)) {
- TCP_PAGE(sk) = page;
- TCP_OFF(sk) = 0;
- }
- goto do_error;
- }
-
- /* Update the skb. */
- if (merge) {
- skb_shinfo(skb)->frags[i - 1].size +=
- copy;
- } else {
- skb_fill_page_desc(skb, i, page, off, copy);
- if (TCP_PAGE(sk)) {
- get_page(page);
- } else if (off + copy < PAGE_SIZE) {
- get_page(page);
- TCP_PAGE(sk) = page;
- }
- }
-
- TCP_OFF(sk) = off + copy;
- }
-
- if (!copied)
- TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_PSH;
-
- tp->write_seq += copy;
- TCP_SKB_CB(skb)->end_seq += copy;
- skb_shinfo(skb)->gso_segs = 0;
-
- from += copy;
- copied += copy;
- if ((seglen -= copy) == 0 && iovlen == 0)
- goto out;
-
- if (skb->len < mss_now || (flags & MSG_OOB))
- continue;
-
- if (forced_push(tp)) {
- tcp_mark_push(tp, skb);
- __tcp_push_pending_frames(sk, tp, mss_now, TCP_NAGLE_PUSH);
- } else if (skb == sk->sk_send_head)
- tcp_push_one(sk, mss_now);
- continue;
-
-wait_for_sndbuf:
- set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
-wait_for_memory:
- if (copied)
- tcp_push(sk, tp, flags & ~MSG_MORE, mss_now, TCP_NAGLE_PUSH);
-
- if ((err = sk_stream_wait_memory(sk, &timeo)) != 0)
- goto do_error;
-
- mss_now = tcp_current_mss(sk, !(flags&MSG_OOB));
- size_goal = tp->xmit_size_goal;
- }
- }
-
-out:
- if (copied)
- tcp_push(sk, tp, flags, mss_now, tp->nonagle);
- TCP_CHECK_TIMER(sk);
- release_sock(sk);
- return copied;
-
-do_fault:
- if (!skb->len) {
- if (sk->sk_send_head == skb)
- sk->sk_send_head = NULL;
- __skb_unlink(skb, &sk->sk_write_queue);
- sk_stream_free_skb(sk, skb);
- }
-
-do_error:
- if (copied)
- goto out;
-out_err:
- err = sk_stream_error(sk, flags, err);
- TCP_CHECK_TIMER(sk);
- release_sock(sk);
- return err;
-}
-
-/*
- * Handle reading urgent data. BSD has very simple semantics for
- * this, no blocking and very strange errors 8)
- */
-
-static int tcp_recv_urg(struct sock *sk, long timeo,
- struct msghdr *msg, int len, int flags,
- int *addr_len)
-{
- struct tcp_sock *tp = tcp_sk(sk);
-
- /* No URG data to read. */
- if (sock_flag(sk, SOCK_URGINLINE) || !tp->urg_data ||
- tp->urg_data == TCP_URG_READ)
- return -EINVAL; /* Yes this is right ! */
-
- if (sk->sk_state == TCP_CLOSE && !sock_flag(sk, SOCK_DONE))
- return -ENOTCONN;
-
- if (tp->urg_data & TCP_URG_VALID) {
- int err = 0;
- char c = tp->urg_data;
-
- if (!(flags & MSG_PEEK))
- tp->urg_data = TCP_URG_READ;
-
- /* Read urgent data. */
- msg->msg_flags |= MSG_OOB;
-
- if (len > 0) {
- if (!(flags & MSG_TRUNC))
- err = memcpy_toiovec(msg->msg_iov, &c, 1);
- len = 1;
- } else
- msg->msg_flags |= MSG_TRUNC;
-
- return err ? -EFAULT : len;
- }
-
- if (sk->sk_state == TCP_CLOSE || (sk->sk_shutdown & RCV_SHUTDOWN))
- return 0;
-
- /* Fixed the recv(..., MSG_OOB) behaviour. BSD docs and
- * the available implementations agree in this case:
- * this call should never block, independent of the
- * blocking state of the socket.
- * Mike <pall@rz.uni-karlsruhe.de>
- */
- return -EAGAIN;
-}
-
-/* Clean up the receive buffer for full frames taken by the user,
- * then send an ACK if necessary. COPIED is the number of bytes
- * tcp_recvmsg has given to the user so far, it speeds up the
- * calculation of whether or not we must ACK for the sake of
- * a window update.
- */
-void cleanup_rbuf(struct sock *sk, int copied)
-{
- struct tcp_sock *tp = tcp_sk(sk);
- int time_to_ack = 0;
-
-#if TCP_DEBUG
- struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
-
- BUG_TRAP(!skb || before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq));
-#endif
-
- if (inet_csk_ack_scheduled(sk)) {
- const struct inet_connection_sock *icsk = inet_csk(sk);
- /* Delayed ACKs frequently hit locked sockets during bulk
- * receive. */
- if (icsk->icsk_ack.blocked ||
- /* Once-per-two-segments ACK was not sent by tcp_input.c */
- tp->rcv_nxt - tp->rcv_wup > icsk->icsk_ack.rcv_mss ||
- /*
- * If this read emptied read buffer, we send ACK, if
- * connection is not bidirectional, user drained
- * receive buffer and there was a small segment
- * in queue.
- */
- (copied > 0 && (icsk->icsk_ack.pending & ICSK_ACK_PUSHED) &&
- !icsk->icsk_ack.pingpong && !atomic_read(&sk->sk_rmem_alloc)))
- time_to_ack = 1;
- }
-
- /* We send an ACK if we can now advertise a non-zero window
- * which has been raised "significantly".
- *
- * Even if window raised up to infinity, do not send window open ACK
- * in states, where we will not receive more. It is useless.
- */
- if (copied > 0 && !time_to_ack && !(sk->sk_shutdown & RCV_SHUTDOWN)) {
- __u32 rcv_window_now = tcp_receive_window(tp);
-
- /* Optimize, __tcp_select_window() is not cheap. */
- if (2*rcv_window_now <= tp->window_clamp) {
- __u32 new_window = __tcp_select_window(sk);
-
- /* Send ACK now, if this read freed lots of space
- * in our buffer. Certainly, new_window is new window.
- * We can advertise it now, if it is not less than current one.
- * "Lots" means "at least twice" here.
- */
- if (new_window && new_window >= 2 * rcv_window_now)
- time_to_ack = 1;
- }
- }
- if (time_to_ack)
- tcp_send_ack(sk);
-}
-
-static void tcp_prequeue_process(struct sock *sk)
-{
- struct sk_buff *skb;
- struct tcp_sock *tp = tcp_sk(sk);
-
- NET_INC_STATS_USER(LINUX_MIB_TCPPREQUEUED);
-
- /* RX process wants to run with disabled BHs, though it is not
- * necessary */
- local_bh_disable();
- while ((skb = __skb_dequeue(&tp->ucopy.prequeue)) != NULL)
- sk->sk_backlog_rcv(sk, skb);
- local_bh_enable();
-
- /* Clear memory counter. */
- tp->ucopy.memory = 0;
-}
-
-static inline struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
-{
- struct sk_buff *skb;
- u32 offset;
-
- skb_queue_walk(&sk->sk_receive_queue, skb) {
- offset = seq - TCP_SKB_CB(skb)->seq;
- if (skb->h.th->syn)
- offset--;
- if (offset < skb->len || skb->h.th->fin) {
- *off = offset;
- return skb;
- }
- }
- return NULL;
-}
-
-/*
- * This routine provides an alternative to tcp_recvmsg() for routines
- * that would like to handle copying from skbuffs directly in 'sendfile'
- * fashion.
- * Note:
- * - It is assumed that the socket was locked by the caller.
- * - The routine does not block.
- * - At present, there is no support for reading OOB data
- * or for 'peeking' the socket using this routine
- * (although both would be easy to implement).
- */
-int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
- sk_read_actor_t recv_actor)
-{
- struct sk_buff *skb;
- struct tcp_sock *tp = tcp_sk(sk);
- u32 seq = tp->copied_seq;
- u32 offset;
- int copied = 0;
-
- if (sk->sk_state == TCP_LISTEN)
- return -ENOTCONN;
- while ((skb = tcp_recv_skb(sk, seq, &offset)) != NULL) {
- if (offset < skb->len) {
- size_t used, len;
-
- len = skb->len - offset;
- /* Stop reading if we hit a patch of urgent data */
- if (tp->urg_data) {
- u32 urg_offset = tp->urg_seq - seq;
- if (urg_offset < len)
- len = urg_offset;
- if (!len)
- break;
- }
- used = recv_actor(desc, skb, offset, len);
- if (used <= len) {
- seq += used;
- copied += used;
- offset += used;
- }
- if (offset != skb->len)
- break;
- }
- if (skb->h.th->fin) {
- sk_eat_skb(sk, skb);
- ++seq;
- break;
- }
- sk_eat_skb(sk, skb);
- if (!desc->count)
- break;
- }
- tp->copied_seq = seq;
-
- tcp_rcv_space_adjust(sk);
-
- /* Clean up data we have read: This will do ACK frames. */
- if (copied)
- cleanup_rbuf(sk, copied);
- return copied;
-}
-
-/*
- * This routine copies from a sock struct into the user buffer.
- *
- * Technical note: in 2.3 we work on _locked_ socket, so that
- * tricks with *seq access order and skb->users are not required.
- * Probably, code can be easily improved even more.
- */
-
-int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
- size_t len, int nonblock, int flags, int *addr_len)
-{
- struct tcp_sock *tp = tcp_sk(sk);
- int copied = 0;
- u32 peek_seq;
- u32 *seq;
- unsigned long used;
- int err;
- int target; /* Read at least this many bytes */
- long timeo;
- struct task_struct *user_recv = NULL;
-
- lock_sock(sk);
-
- TCP_CHECK_TIMER(sk);
-
- err = -ENOTCONN;
- if (sk->sk_state == TCP_LISTEN)
- goto out;
-
- timeo = sock_rcvtimeo(sk, nonblock);
-
- /* Urgent data needs to be handled specially. */
- if (flags & MSG_OOB)
- goto recv_urg;
-
- seq = &tp->copied_seq;
- if (flags & MSG_PEEK) {
- peek_seq = tp->copied_seq;
- seq = &peek_seq;
- }
-
- target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
-
- do {
- struct sk_buff *skb;
- u32 offset;
-
- /* Are we at urgent data? Stop if we have read anything or have SIGURG pending. */
- if (tp->urg_data && tp->urg_seq == *seq) {
- if (copied)
- break;
- if (signal_pending(current)) {
- copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
- break;
- }
- }
-
- /* Next get a buffer. */
-
- skb = skb_peek(&sk->sk_receive_queue);
- do {
- if (!skb)
- break;
-
- /* Now that we have two receive queues this
- * shouldn't happen.
- */
- if (before(*seq, TCP_SKB_CB(skb)->seq)) {
- printk(KERN_INFO "recvmsg bug: copied %X "
- "seq %X\n", *seq, TCP_SKB_CB(skb)->seq);
- break;
- }
- offset = *seq - TCP_SKB_CB(skb)->seq;
- if (skb->h.th->syn)
- offset--;
- if (offset < skb->len)
- goto found_ok_skb;
- if (skb->h.th->fin)
- goto found_fin_ok;
- BUG_TRAP(flags & MSG_PEEK);
- skb = skb->next;
- } while (skb != (struct sk_buff *)&sk->sk_receive_queue);
-
- /* Well, if we have backlog, try to process it now yet. */
-
- if (copied >= target && !sk->sk_backlog.tail)
- break;
-
- if (copied) {
- if (sk->sk_err ||
- sk->sk_state == TCP_CLOSE ||
- (sk->sk_shutdown & RCV_SHUTDOWN) ||
- !timeo ||
- signal_pending(current) ||
- (flags & MSG_PEEK))
- break;
- } else {
- if (sock_flag(sk, SOCK_DONE))
- break;
-
- if (sk->sk_err) {
- copied = sock_error(sk);
- break;
- }
-
- if (sk->sk_shutdown & RCV_SHUTDOWN)
- break;
-
- if (sk->sk_state == TCP_CLOSE) {
- if (!sock_flag(sk, SOCK_DONE)) {
- /* This occurs when user tries to read
- * from never connected socket.
- */
- copied = -ENOTCONN;
- break;
- }
- break;
- }
-
- if (!timeo) {
- copied = -EAGAIN;
- break;
- }
-
- if (signal_pending(current)) {
- copied = sock_intr_errno(timeo);
- break;
- }
- }
-
- cleanup_rbuf(sk, copied);
-
- if (!sysctl_tcp_low_latency && tp->ucopy.task == user_recv) {
- /* Install new reader */
- if (!user_recv && !(flags & (MSG_TRUNC | MSG_PEEK))) {
- user_recv = current;
- tp->ucopy.task = user_recv;
- tp->ucopy.iov = msg->msg_iov;
- }
-
- tp->ucopy.len = len;
-
- BUG_TRAP(tp->copied_seq == tp->rcv_nxt ||
- (flags & (MSG_PEEK | MSG_TRUNC)));
-
- /* Ugly... If prequeue is not empty, we have to
- * process it before releasing socket, otherwise
- * order will be broken at second iteration.
- * More elegant solution is required!!!
- *
- * Look: we have the following (pseudo)queues:
- *
- * 1. packets in flight
- * 2. backlog
- * 3. prequeue
- * 4. receive_queue
- *
- * Each queue can be processed only if the next ones
- * are empty. At this point we have empty receive_queue.
- * But prequeue _can_ be not empty after 2nd iteration,
- * when we jumped to start of loop because backlog
- * processing added something to receive_queue.
- * We cannot release_sock(), because backlog contains
- * packets arrived _after_ prequeued ones.
- *
- * Shortly, algorithm is clear --- to process all
- * the queues in order. We could make it more directly,
- * requeueing packets from backlog to prequeue, if
- * is not empty. It is more elegant, but eats cycles,
- * unfortunately.
- */
- if (!skb_queue_empty(&tp->ucopy.prequeue))
- goto do_prequeue;
-
- /* __ Set realtime policy in scheduler __ */
- }
-
- if (copied >= target) {
- /* Do not sleep, just process backlog. */
- release_sock(sk);
- lock_sock(sk);
- } else
- sk_wait_data(sk, &timeo);
-
- if (user_recv) {
- int chunk;
-
- /* __ Restore normal policy in scheduler __ */
-
- if ((chunk = len - tp->ucopy.len) != 0) {
- NET_ADD_STATS_USER(LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG, chunk);
- len -= chunk;
- copied += chunk;
- }
-
- if (tp->rcv_nxt == tp->copied_seq &&
- !skb_queue_empty(&tp->ucopy.prequeue)) {
-do_prequeue:
- tcp_prequeue_process(sk);
-
- if ((chunk = len - tp->ucopy.len) != 0) {
- NET_ADD_STATS_USER(LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk);
- len -= chunk;
- copied += chunk;
- }
- }
- }
- if ((flags & MSG_PEEK) && peek_seq != tp->copied_seq) {
- if (net_ratelimit())
- printk(KERN_DEBUG "TCP(%s:%d): Application bug, race in MSG_PEEK.\n",
- current->comm, current->pid);
- peek_seq = tp->copied_seq;
- }
- continue;
-
- found_ok_skb:
- /* Ok so how much can we use? */
- used = skb->len - offset;
- if (len < used)
- used = len;
-
- /* Do we have urgent data here? */
- if (tp->urg_data) {
- u32 urg_offset = tp->urg_seq - *seq;
- if (urg_offset < used) {
- if (!urg_offset) {
- if (!sock_flag(sk, SOCK_URGINLINE)) {
- ++*seq;
- offset++;
- used--;
- if (!used)
- goto skip_copy;
- }
- } else
- used = urg_offset;
- }
- }
-
- if (!(flags & MSG_TRUNC)) {
- err = skb_copy_datagram_iovec(skb, offset,
- msg->msg_iov, used);
- if (err) {
- /* Exception. Bailout! */
- if (!copied)
- copied = -EFAULT;
- break;
- }
- }
-
- *seq += used;
- copied += used;
- len -= used;
-
- tcp_rcv_space_adjust(sk);
-
-skip_copy:
- if (tp->urg_data && after(tp->copied_seq, tp->urg_seq)) {
- tp->urg_data = 0;
- tcp_fast_path_check(sk, tp);
- }
- if (used + offset < skb->len)
- continue;
-
- if (skb->h.th->fin)
- goto found_fin_ok;
- if (!(flags & MSG_PEEK))
- sk_eat_skb(sk, skb);
- continue;
-
- found_fin_ok:
- /* Process the FIN. */
- ++*seq;
- if (!(flags & MSG_PEEK))
- sk_eat_skb(sk, skb);
- break;
- } while (len > 0);
-
- if (user_recv) {
- if (!skb_queue_empty(&tp->ucopy.prequeue)) {
- int chunk;
-
- tp->ucopy.len = copied > 0 ? len : 0;
-
- tcp_prequeue_process(sk);
-
- if (copied > 0 && (chunk = len - tp->ucopy.len) != 0) {
- NET_ADD_STATS_USER(LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk);
- len -= chunk;
- copied += chunk;
- }
- }
-
- tp->ucopy.task = NULL;
- tp->ucopy.len = 0;
- }
-
- /* According to UNIX98, msg_name/msg_namelen are ignored
- * on connected socket. I was just happy when found this 8) --ANK
- */
-
- /* Clean up data we have read: This will do ACK frames. */
- cleanup_rbuf(sk, copied);
-
- TCP_CHECK_TIMER(sk);
- release_sock(sk);
- return copied;
-
-out:
- TCP_CHECK_TIMER(sk);
- release_sock(sk);
- return err;
-
-recv_urg:
- err = tcp_recv_urg(sk, timeo, msg, len, flags, addr_len);
- goto out;
-}
-
-/*
- * State processing on a close. This implements the state shift for
- * sending our FIN frame. Note that we only send a FIN for some
- * states. A shutdown() may have already sent the FIN, or we may be
- * closed.
- */
-
-static const unsigned char new_state[16] = {
- /* current state: new state: action: */
- /* (Invalid) */ TCP_CLOSE,
- /* TCP_ESTABLISHED */ TCP_FIN_WAIT1 | TCP_ACTION_FIN,
- /* TCP_SYN_SENT */ TCP_CLOSE,
- /* TCP_SYN_RECV */ TCP_FIN_WAIT1 | TCP_ACTION_FIN,
- /* TCP_FIN_WAIT1 */ TCP_FIN_WAIT1,
- /* TCP_FIN_WAIT2 */ TCP_FIN_WAIT2,
- /* TCP_TIME_WAIT */ TCP_CLOSE,
- /* TCP_CLOSE */ TCP_CLOSE,
- /* TCP_CLOSE_WAIT */ TCP_LAST_ACK | TCP_ACTION_FIN,
- /* TCP_LAST_ACK */ TCP_LAST_ACK,
- /* TCP_LISTEN */ TCP_CLOSE,
- /* TCP_CLOSING */ TCP_CLOSING,
-};
-
-static int tcp_close_state(struct sock *sk)
-{
- int next = (int)new_state[sk->sk_state];
- int ns = next & TCP_STATE_MASK;
-
- tcp_set_state(sk, ns);
-
- return next & TCP_ACTION_FIN;
-}
-
-/*
- * Shutdown the sending side of a connection. Much like close except
- * that we don't receive shut down or set_sock_flag(sk, SOCK_DEAD).
- */
-
-void tcp_shutdown(struct sock *sk, int how)
-{
- /* We need to grab some memory, and put together a FIN,
- * and then put it into the queue to be sent.
- * Tim MacKenzie(tym@dibbler.cs.monash.edu.au) 4 Dec '92.
- */
- if (!(how & SEND_SHUTDOWN))
- return;
-
- /* If we've already sent a FIN, or it's a closed state, skip this. */
- if ((1 << sk->sk_state) &
- (TCPF_ESTABLISHED | TCPF_SYN_SENT |
- TCPF_SYN_RECV | TCPF_CLOSE_WAIT)) {
- /* Clear out any half completed packets. FIN if needed. */
- if (tcp_close_state(sk))
- tcp_send_fin(sk);
- }
-}
-
-void tcp_close(struct sock *sk, long timeout)
-{
- struct sk_buff *skb;
- int data_was_unread = 0;
- int state;
-
- lock_sock(sk);
- sk->sk_shutdown = SHUTDOWN_MASK;
-
- if (sk->sk_state == TCP_LISTEN) {
- tcp_set_state(sk, TCP_CLOSE);
-
- /* Special case. */
- inet_csk_listen_stop(sk);
-
- goto adjudge_to_death;
- }
-
- /* We need to flush the recv. buffs. We do this only on the
- * descriptor close, not protocol-sourced closes, because the
- * reader process may not have drained the data yet!
- */
- while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
- u32 len = TCP_SKB_CB(skb)->end_seq - TCP_SKB_CB(skb)->seq -
- skb->h.th->fin;
- data_was_unread += len;
- __kfree_skb(skb);
- }
-
- sk_stream_mem_reclaim(sk);
-
- /* As outlined in draft-ietf-tcpimpl-prob-03.txt, section
- * 3.10, we send a RST here because data was lost. To
- * witness the awful effects of the old behavior of always
- * doing a FIN, run an older 2.1.x kernel or 2.0.x, start
- * a bulk GET in an FTP client, suspend the process, wait
- * for the client to advertise a zero window, then kill -9
- * the FTP client, wheee... Note: timeout is always zero
- * in such a case.
- */
- if (data_was_unread) {
- /* Unread data was tossed, zap the connection. */
- NET_INC_STATS_USER(LINUX_MIB_TCPABORTONCLOSE);
- tcp_set_state(sk, TCP_CLOSE);
- tcp_send_active_reset(sk, GFP_KERNEL);
- } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
- /* Check zero linger _after_ checking for unread data. */
- sk->sk_prot->disconnect(sk, 0);
- NET_INC_STATS_USER(LINUX_MIB_TCPABORTONDATA);
- } else if (tcp_close_state(sk)) {
- /* We FIN if the application ate all the data before
- * zapping the connection.
- */
-
- /* RED-PEN. Formally speaking, we have broken TCP state
- * machine. State transitions:
- *
- * TCP_ESTABLISHED -> TCP_FIN_WAIT1
- * TCP_SYN_RECV -> TCP_FIN_WAIT1 (forget it, it's impossible)
- * TCP_CLOSE_WAIT -> TCP_LAST_ACK
- *
- * are legal only when FIN has been sent (i.e. in window),
- * rather than queued out of window. Purists blame.
- *
- * F.e. "RFC state" is ESTABLISHED,
- * if Linux state is FIN-WAIT-1, but FIN is still not sent.
- *
- * The visible declinations are that sometimes
- * we enter time-wait state, when it is not required really
- * (harmless), do not send active resets, when they are
- * required by specs (TCP_ESTABLISHED, TCP_CLOSE_WAIT, when
- * they look as CLOSING or LAST_ACK for Linux)
- * Probably, I missed some more holelets.
- * --ANK
- */
- tcp_send_fin(sk);
- }
-
- sk_stream_wait_close(sk, timeout);
-
-adjudge_to_death:
- state = sk->sk_state;
- sock_hold(sk);
- sock_orphan(sk);
- atomic_inc(sk->sk_prot->orphan_count);
-
- /* It is the last release_sock in its life. It will remove backlog. */
- release_sock(sk);
-
-
- /* Now socket is owned by kernel and we acquire BH lock
- to finish close. No need to check for user refs.
- */
- local_bh_disable();
- bh_lock_sock(sk);
- BUG_TRAP(!sock_owned_by_user(sk));
-
- /* Have we already been destroyed by a softirq or backlog? */
- if (state != TCP_CLOSE && sk->sk_state == TCP_CLOSE)
- goto out;
-
- /* This is a (useful) BSD violating of the RFC. There is a
- * problem with TCP as specified in that the other end could
- * keep a socket open forever with no application left this end.
- * We use a 3 minute timeout (about the same as BSD) then kill
- * our end. If they send after that then tough - BUT: long enough
- * that we won't make the old 4*rto = almost no time - whoops
- * reset mistake.
- *
- * Nope, it was not mistake. It is really desired behaviour
- * f.e. on http servers, when such sockets are useless, but
- * consume significant resources. Let's do it with special
- * linger2 option. --ANK
- */
-
- if (sk->sk_state == TCP_FIN_WAIT2) {
- struct tcp_sock *tp = tcp_sk(sk);
- if (tp->linger2 < 0) {
- tcp_set_state(sk, TCP_CLOSE);
- tcp_send_active_reset(sk, GFP_ATOMIC);
- NET_INC_STATS_BH(LINUX_MIB_TCPABORTONLINGER);
- } else {
- const int tmo = tcp_fin_time(sk);
-
- if (tmo > TCP_TIMEWAIT_LEN) {
- inet_csk_reset_keepalive_timer(sk, tcp_fin_time(sk));
- } else {
- tcp_time_wait(sk, TCP_FIN_WAIT2, tmo);
- goto out;
- }
- }
- }
- if (sk->sk_state != TCP_CLOSE) {
- sk_stream_mem_reclaim(sk);
- if (atomic_read(sk->sk_prot->orphan_count) > sysctl_tcp_max_orphans ||
- (sk->sk_wmem_queued > SOCK_MIN_SNDBUF &&
- atomic_read(&tcp_memory_allocated) > sysctl_tcp_mem[2])) {
- if (net_ratelimit())
- printk(KERN_INFO "TCP: too many of orphaned "
- "sockets\n");
- tcp_set_state(sk, TCP_CLOSE);
- tcp_send_active_reset(sk, GFP_ATOMIC);
- NET_INC_STATS_BH(LINUX_MIB_TCPABORTONMEMORY);
- }
- }
-
- if (sk->sk_state == TCP_CLOSE)
- inet_csk_destroy_sock(sk);
- /* Otherwise, socket is reprieved until protocol close. */
-
-out:
- bh_unlock_sock(sk);
- local_bh_enable();
- sock_put(sk);
-}
-
-/* These states need RST on ABORT according to RFC793 */
-
-static inline int tcp_need_reset(int state)
-{
- return (1 << state) &
- (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_FIN_WAIT1 |
- TCPF_FIN_WAIT2 | TCPF_SYN_RECV);
-}
-
-int tcp_disconnect(struct sock *sk, int flags)
-{
- struct inet_sock *inet = inet_sk(sk);
- struct inet_connection_sock *icsk = inet_csk(sk);
- struct tcp_sock *tp = tcp_sk(sk);
- int err = 0;
- int old_state = sk->sk_state;
-
- if (old_state != TCP_CLOSE)
- tcp_set_state(sk, TCP_CLOSE);
-
- /* ABORT function of RFC793 */
- if (old_state == TCP_LISTEN) {
- inet_csk_listen_stop(sk);
- } else if (tcp_need_reset(old_state) ||
- (tp->snd_nxt != tp->write_seq &&
- (1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK))) {
- /* The last check adjusts for discrepancy of Linux wrt. RFC
- * states
- */
- tcp_send_active_reset(sk, gfp_any());
- sk->sk_err = ECONNRESET;
- } else if (old_state == TCP_SYN_SENT)
- sk->sk_err = ECONNRESET;
-
- tcp_clear_xmit_timers(sk);
- __skb_queue_purge(&sk->sk_receive_queue);
- sk_stream_writequeue_purge(sk);
- __skb_queue_purge(&tp->out_of_order_queue);
-
- inet->dport = 0;
-
- if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
- inet_reset_saddr(sk);
-
- sk->sk_shutdown = 0;
- sock_reset_flag(sk, SOCK_DONE);
- tp->srtt = 0;
- if ((tp->write_seq += tp->max_window + 2) == 0)
- tp->write_seq = 1;
- icsk->icsk_backoff = 0;
- tp->snd_cwnd = 2;
- icsk->icsk_probes_out = 0;
- tp->packets_out = 0;
- tp->snd_ssthresh = 0x7fffffff;
- tp->snd_cwnd_cnt = 0;
- tp->bytes_acked = 0;
- tcp_set_ca_state(sk, TCP_CA_Open);
- tcp_clear_retrans(tp);
- inet_csk_delack_init(sk);
- sk->sk_send_head = NULL;
- tp->rx_opt.saw_tstamp = 0;
- tcp_sack_reset(&tp->rx_opt);
- __sk_dst_reset(sk);
-
- BUG_TRAP(!inet->num || icsk->icsk_bind_hash);
-
- sk->sk_error_report(sk);
- return err;
-}
-
-/*
- * Socket option code for TCP.
- */
-static int do_tcp_setsockopt(struct sock *sk, int level,
- int optname, char __user *optval, int optlen)
-{
- struct tcp_sock *tp = tcp_sk(sk);
- struct inet_connection_sock *icsk = inet_csk(sk);
- int val;
- int err = 0;
-
- /* This is a string value all the others are int's */
- if (optname == TCP_CONGESTION) {
- char name[TCP_CA_NAME_MAX];
-
- if (optlen < 1)
- return -EINVAL;
-
- val = strncpy_from_user(name, optval,
- min(TCP_CA_NAME_MAX-1, optlen));
- if (val < 0)
- return -EFAULT;
- name[val] = 0;
-
- lock_sock(sk);
- err = tcp_set_congestion_control(sk, name);
- release_sock(sk);
- return err;
- }
-
- if (optlen < sizeof(int))
- return -EINVAL;
-
- if (get_user(val, (int __user *)optval))
- return -EFAULT;
-
- lock_sock(sk);
-
- switch (optname) {
- case TCP_MAXSEG:
- /* Values greater than interface MTU won't take effect. However
- * at the point when this call is done we typically don't yet
- * know which interface is going to be used */
- if (val < 8 || val > MAX_TCP_WINDOW) {
- err = -EINVAL;
- break;
- }
- tp->rx_opt.user_mss = val;
- break;
-
- case TCP_NODELAY:
- if (val) {
- /* TCP_NODELAY is weaker than TCP_CORK, so that
- * this option on corked socket is remembered, but
- * it is not activated until cork is cleared.
- *
- * However, when TCP_NODELAY is set we make
- * an explicit push, which overrides even TCP_CORK
- * for currently queued segments.
- */
- tp->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH;
- tcp_push_pending_frames(sk, tp);
- } else {
- tp->nonagle &= ~TCP_NAGLE_OFF;
- }
- break;
-
- case TCP_CORK:
- /* When set indicates to always queue non-full frames.
- * Later the user clears this option and we transmit
- * any pending partial frames in the queue. This is
- * meant to be used alongside sendfile() to get properly
- * filled frames when the user (for example) must write
- * out headers with a write() call first and then use
- * sendfile to send out the data parts.
- *
- * TCP_CORK can be set together with TCP_NODELAY and it is
- * stronger than TCP_NODELAY.
- */
- if (val) {
- tp->nonagle |= TCP_NAGLE_CORK;
- } else {
- tp->nonagle &= ~TCP_NAGLE_CORK;
- if (tp->nonagle&TCP_NAGLE_OFF)
- tp->nonagle |= TCP_NAGLE_PUSH;
- tcp_push_pending_frames(sk, tp);
- }
- break;
-
- case TCP_KEEPIDLE:
- if (val < 1 || val > MAX_TCP_KEEPIDLE)
- err = -EINVAL;
- else {
- tp->keepalive_time = val * HZ;
- if (sock_flag(sk, SOCK_KEEPOPEN) &&
- !((1 << sk->sk_state) &
- (TCPF_CLOSE | TCPF_LISTEN))) {
- __u32 elapsed = tcp_time_stamp - tp->rcv_tstamp;
- if (tp->keepalive_time > elapsed)
- elapsed = tp->keepalive_time - elapsed;
- else
- elapsed = 0;
- inet_csk_reset_keepalive_timer(sk, elapsed);
- }
- }
- break;
- case TCP_KEEPINTVL:
- if (val < 1 || val > MAX_TCP_KEEPINTVL)
- err = -EINVAL;
- else
- tp->keepalive_intvl = val * HZ;
- break;
- case TCP_KEEPCNT:
- if (val < 1 || val > MAX_TCP_KEEPCNT)
- err = -EINVAL;
- else
- tp->keepalive_probes = val;
- break;
- case TCP_SYNCNT:
- if (val < 1 || val > MAX_TCP_SYNCNT)
- err = -EINVAL;
- else
- icsk->icsk_syn_retries = val;
- break;
-
- case TCP_LINGER2:
- if (val < 0)
- tp->linger2 = -1;
- else if (val > sysctl_tcp_fin_timeout / HZ)
- tp->linger2 = 0;
- else
- tp->linger2 = val * HZ;
- break;
-
- case TCP_DEFER_ACCEPT:
- icsk->icsk_accept_queue.rskq_defer_accept = 0;
- if (val > 0) {
- /* Translate value in seconds to number of
- * retransmits */
- while (icsk->icsk_accept_queue.rskq_defer_accept < 32 &&
- val > ((TCP_TIMEOUT_INIT / HZ) <<
- icsk->icsk_accept_queue.rskq_defer_accept))
- icsk->icsk_accept_queue.rskq_defer_accept++;
- icsk->icsk_accept_queue.rskq_defer_accept++;
- }
- break;
-
- case TCP_WINDOW_CLAMP:
- if (!val) {
- if (sk->sk_state != TCP_CLOSE) {
- err = -EINVAL;
- break;
- }
- tp->window_clamp = 0;
- } else
- tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ?
- SOCK_MIN_RCVBUF / 2 : val;
- break;
-
- case TCP_QUICKACK:
- if (!val) {
- icsk->icsk_ack.pingpong = 1;
- } else {
- icsk->icsk_ack.pingpong = 0;
- if ((1 << sk->sk_state) &
- (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) &&
- inet_csk_ack_scheduled(sk)) {
- icsk->icsk_ack.pending |= ICSK_ACK_PUSHED;
- cleanup_rbuf(sk, 1);
- if (!(val & 1))
- icsk->icsk_ack.pingpong = 1;
- }
- }
- break;
-
- default:
- err = -ENOPROTOOPT;
- break;
- };
- release_sock(sk);
- return err;
-}
-
-int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
- int optlen)
-{
- struct inet_connection_sock *icsk = inet_csk(sk);
-
- if (level != SOL_TCP)
- return icsk->icsk_af_ops->setsockopt(sk, level, optname,
- optval, optlen);
- return do_tcp_setsockopt(sk, level, optname, optval, optlen);
-}
-
-#ifdef CONFIG_COMPAT
-int compat_tcp_setsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int optlen)
-{
- if (level != SOL_TCP)
- return inet_csk_compat_setsockopt(sk, level, optname,
- optval, optlen);
- return do_tcp_setsockopt(sk, level, optname, optval, optlen);
-}
-
-EXPORT_SYMBOL(compat_tcp_setsockopt);
-#endif
-
-/* Return information about state of tcp endpoint in API format. */
-void tcp_get_info(struct sock *sk, struct tcp_info *info)
-{
- struct tcp_sock *tp = tcp_sk(sk);
- const struct inet_connection_sock *icsk = inet_csk(sk);
- u32 now = tcp_time_stamp;
-
- memset(info, 0, sizeof(*info));
-
- info->tcpi_state = sk->sk_state;
- info->tcpi_ca_state = icsk->icsk_ca_state;
- info->tcpi_retransmits = icsk->icsk_retransmits;
- info->tcpi_probes = icsk->icsk_probes_out;
- info->tcpi_backoff = icsk->icsk_backoff;
-
- if (tp->rx_opt.tstamp_ok)
- info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
- if (tp->rx_opt.sack_ok)
- info->tcpi_options |= TCPI_OPT_SACK;
- if (tp->rx_opt.wscale_ok) {
- info->tcpi_options |= TCPI_OPT_WSCALE;
- info->tcpi_snd_wscale = tp->rx_opt.snd_wscale;
- info->tcpi_rcv_wscale = tp->rx_opt.rcv_wscale;
- }
-
- if (tp->ecn_flags&TCP_ECN_OK)
- info->tcpi_options |= TCPI_OPT_ECN;
-
- info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto);
- info->tcpi_ato = jiffies_to_usecs(icsk->icsk_ack.ato);
- info->tcpi_snd_mss = tp->mss_cache;
- info->tcpi_rcv_mss = icsk->icsk_ack.rcv_mss;
-
- info->tcpi_unacked = tp->packets_out;
- info->tcpi_sacked = tp->sacked_out;
- info->tcpi_lost = tp->lost_out;
- info->tcpi_retrans = tp->retrans_out;
- info->tcpi_fackets = tp->fackets_out;
-
- info->tcpi_last_data_sent = jiffies_to_msecs(now - tp->lsndtime);
- info->tcpi_last_data_recv = jiffies_to_msecs(now - icsk->icsk_ack.lrcvtime);
- info->tcpi_last_ack_recv = jiffies_to_msecs(now - tp->rcv_tstamp);
-
- info->tcpi_pmtu = icsk->icsk_pmtu_cookie;
- info->tcpi_rcv_ssthresh = tp->rcv_ssthresh;
- info->tcpi_rtt = jiffies_to_usecs(tp->srtt)>>3;
- info->tcpi_rttvar = jiffies_to_usecs(tp->mdev)>>2;
- info->tcpi_snd_ssthresh = tp->snd_ssthresh;
- info->tcpi_snd_cwnd = tp->snd_cwnd;
- info->tcpi_advmss = tp->advmss;
- info->tcpi_reordering = tp->reordering;
-
- info->tcpi_rcv_rtt = jiffies_to_usecs(tp->rcv_rtt_est.rtt)>>3;
- info->tcpi_rcv_space = tp->rcvq_space.space;
-
- info->tcpi_total_retrans = tp->total_retrans;
-}
-
-EXPORT_SYMBOL_GPL(tcp_get_info);
-
-static int do_tcp_getsockopt(struct sock *sk, int level,
- int optname, char __user *optval, int __user *optlen)
-{
- struct inet_connection_sock *icsk = inet_csk(sk);
- struct tcp_sock *tp = tcp_sk(sk);
- int val, len;
-
- if (get_user(len, optlen))
- return -EFAULT;
-
- len = min_t(unsigned int, len, sizeof(int));
-
- if (len < 0)
- return -EINVAL;
-
- switch (optname) {
- case TCP_MAXSEG:
- val = tp->mss_cache;
- if (!val && ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN)))
- val = tp->rx_opt.user_mss;
- break;
- case TCP_NODELAY:
- val = !!(tp->nonagle&TCP_NAGLE_OFF);
- break;
- case TCP_CORK:
- val = !!(tp->nonagle&TCP_NAGLE_CORK);
- break;
- case TCP_KEEPIDLE:
- val = (tp->keepalive_time ? : sysctl_tcp_keepalive_time) / HZ;
- break;
- case TCP_KEEPINTVL:
- val = (tp->keepalive_intvl ? : sysctl_tcp_keepalive_intvl) / HZ;
- break;
- case TCP_KEEPCNT:
- val = tp->keepalive_probes ? : sysctl_tcp_keepalive_probes;
- break;
- case TCP_SYNCNT:
- val = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries;
- break;
- case TCP_LINGER2:
- val = tp->linger2;
- if (val >= 0)
- val = (val ? : sysctl_tcp_fin_timeout) / HZ;
- break;
- case TCP_DEFER_ACCEPT:
- val = !icsk->icsk_accept_queue.rskq_defer_accept ? 0 :
- ((TCP_TIMEOUT_INIT / HZ) << (icsk->icsk_accept_queue.rskq_defer_accept - 1));
- break;
- case TCP_WINDOW_CLAMP:
- val = tp->window_clamp;
- break;
- case TCP_INFO: {
- struct tcp_info info;
-
- if (get_user(len, optlen))
- return -EFAULT;
-
- tcp_get_info(sk, &info);
-
- len = min_t(unsigned int, len, sizeof(info));
- if (put_user(len, optlen))
- return -EFAULT;
- if (copy_to_user(optval, &info, len))
- return -EFAULT;
- return 0;
- }
- case TCP_QUICKACK:
- val = !icsk->icsk_ack.pingpong;
- break;
-
- case TCP_CONGESTION:
- if (get_user(len, optlen))
- return -EFAULT;
- len = min_t(unsigned int, len, TCP_CA_NAME_MAX);
- if (put_user(len, optlen))
- return -EFAULT;
- if (copy_to_user(optval, icsk->icsk_ca_ops->name, len))
- return -EFAULT;
- return 0;
- default:
- return -ENOPROTOOPT;
- };
-
- if (put_user(len, optlen))
- return -EFAULT;
- if (copy_to_user(optval, &val, len))
- return -EFAULT;
- return 0;
-}
-
-int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
- int __user *optlen)
-{
- struct inet_connection_sock *icsk = inet_csk(sk);
-
- if (level != SOL_TCP)
- return icsk->icsk_af_ops->getsockopt(sk, level, optname,
- optval, optlen);
- return do_tcp_getsockopt(sk, level, optname, optval, optlen);
-}
-
-#ifdef CONFIG_COMPAT
-int compat_tcp_getsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int __user *optlen)
-{
- if (level != SOL_TCP)
- return inet_csk_compat_getsockopt(sk, level, optname,
- optval, optlen);
- return do_tcp_getsockopt(sk, level, optname, optval, optlen);
-}
-
-EXPORT_SYMBOL(compat_tcp_getsockopt);
-#endif
-
-struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features)
-{
- struct sk_buff *segs = ERR_PTR(-EINVAL);
- struct tcphdr *th;
- unsigned thlen;
- unsigned int seq;
- unsigned int delta;
- unsigned int oldlen;
- unsigned int len;
-
- if (!pskb_may_pull(skb, sizeof(*th)))
- goto out;
-
- th = skb->h.th;
- thlen = th->doff * 4;
- if (thlen < sizeof(*th))
- goto out;
-
- if (!pskb_may_pull(skb, thlen))
- goto out;
-
- oldlen = (u16)~skb->len;
- __skb_pull(skb, thlen);
-
- if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
- /* Packet is from an untrusted source, reset gso_segs. */
- int mss = skb_shinfo(skb)->gso_size;
-
- skb_shinfo(skb)->gso_segs = (skb->len + mss - 1) / mss;
-
- segs = NULL;
- goto out;
- }
-
- segs = skb_segment(skb, features);
- if (IS_ERR(segs))
- goto out;
-
- len = skb_shinfo(skb)->gso_size;
- delta = htonl(oldlen + (thlen + len));
-
- skb = segs;
- th = skb->h.th;
- seq = ntohl(th->seq);
-
- do {
- th->fin = th->psh = 0;
-
- th->check = ~csum_fold(th->check + delta);
- if (skb->ip_summed != CHECKSUM_HW)
- th->check = csum_fold(csum_partial(skb->h.raw, thlen,
- skb->csum));
-
- seq += len;
- skb = skb->next;
- th = skb->h.th;
-
- th->seq = htonl(seq);
- th->cwr = 0;
- } while (skb->next);
-
- delta = htonl(oldlen + (skb->tail - skb->h.raw) + skb->data_len);
- th->check = ~csum_fold(th->check + delta);
- if (skb->ip_summed != CHECKSUM_HW)
- th->check = csum_fold(csum_partial(skb->h.raw, thlen,
- skb->csum));
-
-out:
- return segs;
-}
-
-extern void __skb_cb_too_small_for_tcp(int, int);
-extern struct tcp_congestion_ops tcp_reno;
-
-static __initdata unsigned long thash_entries;
-static int __init set_thash_entries(char *str)
-{
- if (!str)
- return 0;
- thash_entries = simple_strtoul(str, &str, 0);
- return 1;
-}
-__setup("thash_entries=", set_thash_entries);
-
-void __init tcp_init(void)
-{
- struct sk_buff *skb = NULL;
- unsigned long limit;
- int order, i, max_share;
-
- if (sizeof(struct tcp_skb_cb) > sizeof(skb->cb))
- __skb_cb_too_small_for_tcp(sizeof(struct tcp_skb_cb),
- sizeof(skb->cb));
-
- tcp_hashinfo.bind_bucket_cachep =
- kmem_cache_create("tcp_bind_bucket",
- sizeof(struct inet_bind_bucket), 0,
- SLAB_HWCACHE_ALIGN, NULL, NULL);
- if (!tcp_hashinfo.bind_bucket_cachep)
- panic("tcp_init: Cannot alloc tcp_bind_bucket cache.");
-
- /* Size and allocate the main established and bind bucket
- * hash tables.
- *
- * The methodology is similar to that of the buffer cache.
- */
- tcp_hashinfo.ehash =
- alloc_large_system_hash("TCP established",
- sizeof(struct inet_ehash_bucket),
- thash_entries,
- (num_physpages >= 128 * 1024) ?
- 13 : 15,
- HASH_HIGHMEM,
- &tcp_hashinfo.ehash_size,
- NULL,
- 0);
- tcp_hashinfo.ehash_size = (1 << tcp_hashinfo.ehash_size) >> 1;
- for (i = 0; i < (tcp_hashinfo.ehash_size << 1); i++) {
- rwlock_init(&tcp_hashinfo.ehash[i].lock);
- INIT_HLIST_HEAD(&tcp_hashinfo.ehash[i].chain);
- }
-
- tcp_hashinfo.bhash =
- alloc_large_system_hash("TCP bind",
- sizeof(struct inet_bind_hashbucket),
- tcp_hashinfo.ehash_size,
- (num_physpages >= 128 * 1024) ?
- 13 : 15,
- HASH_HIGHMEM,
- &tcp_hashinfo.bhash_size,
- NULL,
- 64 * 1024);
- tcp_hashinfo.bhash_size = 1 << tcp_hashinfo.bhash_size;
- for (i = 0; i < tcp_hashinfo.bhash_size; i++) {
- spin_lock_init(&tcp_hashinfo.bhash[i].lock);
- INIT_HLIST_HEAD(&tcp_hashinfo.bhash[i].chain);
- }
-
- /* Try to be a bit smarter and adjust defaults depending
- * on available memory.
- */
- for (order = 0; ((1 << order) << PAGE_SHIFT) <
- (tcp_hashinfo.bhash_size * sizeof(struct inet_bind_hashbucket));
- order++)
- ;
- if (order >= 4) {
- sysctl_local_port_range[0] = 32768;
- sysctl_local_port_range[1] = 61000;
- tcp_death_row.sysctl_max_tw_buckets = 180000;
- sysctl_tcp_max_orphans = 4096 << (order - 4);
- sysctl_max_syn_backlog = 1024;
- } else if (order < 3) {
- sysctl_local_port_range[0] = 1024 * (3 - order);
- tcp_death_row.sysctl_max_tw_buckets >>= (3 - order);
- sysctl_tcp_max_orphans >>= (3 - order);
- sysctl_max_syn_backlog = 128;
- }
-
- sysctl_tcp_mem[0] = 768 << order;
- sysctl_tcp_mem[1] = 1024 << order;
- sysctl_tcp_mem[2] = 1536 << order;
-
- limit = ((unsigned long)sysctl_tcp_mem[1]) << (PAGE_SHIFT - 7);
- max_share = min(4UL*1024*1024, limit);
-
- sysctl_tcp_wmem[0] = SK_STREAM_MEM_QUANTUM;
- sysctl_tcp_wmem[1] = 16*1024;
- sysctl_tcp_wmem[2] = max(64*1024, max_share);
-
- sysctl_tcp_rmem[0] = SK_STREAM_MEM_QUANTUM;
- sysctl_tcp_rmem[1] = 87380;
- sysctl_tcp_rmem[2] = max(87380, max_share);
-
- printk(KERN_INFO "TCP: Hash tables configured "
- "(established %d bind %d)\n",
- tcp_hashinfo.ehash_size << 1, tcp_hashinfo.bhash_size);
-
- tcp_register_congestion_control(&tcp_reno);
-}
-
-EXPORT_SYMBOL(tcp_close);
-EXPORT_SYMBOL(tcp_disconnect);
-EXPORT_SYMBOL(tcp_getsockopt);
-EXPORT_SYMBOL(tcp_ioctl);
-EXPORT_SYMBOL(tcp_poll);
-EXPORT_SYMBOL(tcp_read_sock);
-EXPORT_SYMBOL(tcp_recvmsg);
-EXPORT_SYMBOL(tcp_sendmsg);
-EXPORT_SYMBOL(tcp_sendpage);
-EXPORT_SYMBOL(tcp_setsockopt);
-EXPORT_SYMBOL(tcp_shutdown);
-EXPORT_SYMBOL(tcp_statistics);
-EXPORT_SYMBOL_GPL(cleanup_rbuf);
git://git.onelab.eu / linux-2.6.git / commitdiff