| /* |
| * 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/dmaengine.h> |
| |
| /* |
| * 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 */ |
| |
| #ifdef CONFIG_NET_DMA |
| static struct dma_client *net_dma_client; |
| static unsigned int net_dma_count; |
| static spinlock_t net_dma_event_lock; |
| #endif |
| |
| /* |
| * 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. |
| */ |
| |
| 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; |
| } |
| |
| /* 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 |
| |
| /* Keep head the same: replace data */ |
| int __skb_linearize(struct sk_buff *skb, gfp_t gfp_mask) |
| { |
| unsigned int size; |
| u8 *data; |
| long offset; |
| struct skb_shared_info *ninfo; |
| int headerlen = skb->data - skb->head; |
| int expand = (skb->tail + skb->data_len) - skb->end; |
| |
| if (skb_shared(skb)) |
| BUG(); |
| |
| if (expand <= 0) |
| expand = 0; |
| |
| size = skb->end - skb->head + expand; |
| size = SKB_DATA_ALIGN(size); |
| data = kmalloc(size + sizeof(struct skb_shared_info), gfp_mask); |
| if (!data) |
| return -ENOMEM; |
| |
| /* Copy entire thing */ |
| if (skb_copy_bits(skb, -headerlen, data, headerlen + skb->len)) |
| BUG(); |
| |
| /* Set up shinfo */ |
| ninfo = (struct skb_shared_info*)(data + size); |
| atomic_set(&ninfo->dataref, 1); |
| ninfo->tso_size = skb_shinfo(skb)->tso_size; |
| ninfo->tso_segs = skb_shinfo(skb)->tso_segs; |
| ninfo->nr_frags = 0; |
| ninfo->frag_list = NULL; |
| |
| /* Offset between the two in bytes */ |
| offset = data - skb->head; |
| |
| /* Free old data. */ |
| skb_release_data(skb); |
| |
| skb->head = data; |
| skb->end = data + size; |
| |
| /* Set up new pointers */ |
| skb->h.raw += offset; |
| skb->nh.raw += offset; |
| skb->mac.raw += offset; |
| skb->tail += offset; |
| skb->data += offset; |
| |
| /* We are no longer a clone, even if we were. */ |
| skb->cloned = 0; |
| |
| skb->tail += skb->data_len; |
| skb->data_len = 0; |
| return 0; |
| } |
| |
| #define HARD_TX_LOCK(dev, cpu) { \ |
| if ((dev->features & NETIF_F_LLTX) == 0) { \ |
| netif_tx_lock(dev); \ |
| } \ |
| } |
| |
| #define HARD_TX_UNLOCK(dev) { \ |
| if ((dev->features & NETIF_F_LLTX) == 0) { \ |
| netif_tx_unlock(dev); \ |
| } \ |
| } |
| |
| /** |
| * dev_queue_xmit - transmit a buffer |
| * @skb: buffer to transmit |
| * |
| * Queue a buffer for transmission to a network device. The caller must |
| * have set the device and priority and built the buffer before calling |
| * this function. The function can be called from an interrupt. |
| * |
| * A negative errno code is returned on a failure. A success does not |
| * guarantee the frame will be transmitted as it may be dropped due |
| * to congestion or traffic shaping. |
| * |
| * ----------------------------------------------------------------------------------- |
| * I notice this method can also return errors from the queue disciplines, |
| * including NET_XMIT_DROP, which is a positive value. So, errors can also |
| * be positive. |
| * |
| * Regardless of the return value, the skb is consumed, so it is currently |
| * difficult to retry a send to this method. (You can bump the ref count |
| * before sending to hold a reference for retry if you are careful.) |
| * |
| * When calling this method, interrupts MUST be enabled. This is because |
| * the BH enable code must have IRQs enabled so that it will not deadlock. |
| * --BLG |
| */ |
| |
| int dev_queue_xmit(struct sk_buff *skb) |
| { |
| struct net_device *dev = skb->dev; |
| struct Qdisc *q; |
| int rc = -ENOMEM; |
| |
| if (skb_shinfo(skb)->frag_list && |
| !(dev->features & NETIF_F_FRAGLIST) && |
| __skb_linearize(skb, GFP_ATOMIC)) |
| goto out_kfree_skb; |
| |
| /* Fragmented skb is linearized if device does not support SG, |
| * or if at least one of fragments is in highmem and device |
| * does not support DMA from it. |
| */ |
| if (skb_shinfo(skb)->nr_frags && |
| (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) && |
| __skb_linearize(skb, GFP_ATOMIC)) |
| goto out_kfree_skb; |
| |
| /* If packet is not checksummed and device does not support |
| * checksumming for this protocol, complete checksumming here. |
| */ |
| if (skb->ip_summed == CHECKSUM_HW && |
| (!(dev->features & (NETIF_F_HW_CSUM | NETIF_F_NO_CSUM)) && |
| (!(dev->features & NETIF_F_IP_CSUM) || |
| skb->protocol != htons(ETH_P_IP)))) |
| if (skb_checksum_help(skb, 0)) |
| goto out_kfree_skb; |
| |
| spin_lock_prefetch(&dev->queue_lock); |
| |
| /* Disable soft irqs for various locks below. Also |
| * stops preemption for RCU. |
| */ |
| local_bh_disable(); |
| |
| /* Updates of qdisc are serialized by queue_lock. |
| * The struct Qdisc which is pointed to by qdisc is now a |
| * rcu structure - it may be accessed without acquiring |
| * a lock (but the structure may be stale.) The freeing of the |
| * qdisc will be deferred until it's known that there are no |
| * more references to it. |
| * |
| * If the qdisc has an enqueue function, we still need to |
| * hold the queue_lock before calling it, since queue_lock |
| * also serializes access to the device queue. |
| */ |
| |
| q = rcu_dereference(dev->qdisc); |
| #ifdef CONFIG_NET_CLS_ACT |
| skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS); |
| #endif |
| if (q->enqueue) { |
| /* Grab device queue */ |
| spin_lock(&dev->queue_lock); |
| |
| rc = q->enqueue(skb, q); |
| |
| qdisc_run(dev); |
| |
| spin_unlock(&dev->queue_lock); |
| rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc; |
| goto out; |
| } |
| |
| /* The device has no queue. Common case for software devices: |
| loopback, all the sorts of tunnels... |
| |
| Really, it is unlikely that 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)) { |
| if (netdev_nit) |
| dev_queue_xmit_nit(skb, dev); |
| |
| rc = 0; |
| if (!dev->hard_start_xmit(skb, dev)) { |
| HARD_TX_UNLOCK(dev); |
| goto out; |
| } |
| } |
| HARD_TX_UNLOCK(dev); |
| if (net_ratelimit()) |
| printk(KERN_CRIT "Virtual device %s asks to " |
| "queue packet!\n", dev->name); |
| } else { |
| /* Recursion is detected! It is possible, |
| * unfortunately */ |
| if (net_ratelimit()) |
| printk(KERN_CRIT "Dead loop on virtual device " |
| "%s, fix it urgently!\n", dev->name); |
| } |
| } |
| |
| rc = -ENETDOWN; |
| local_bh_enable(); |
| |
| out_kfree_skb: |
| kfree_skb(skb); |
| return rc; |
| out: |
| local_bh_enable(); |
| return rc; |
| } |
| |
| |
| /*======================================================================= |
| Receiver routines |
| =======================================================================*/ |
| |
| int netdev_max_backlog = 1000; |
| int netdev_budget = 300; |
| int weight_p = 64; /* old backlog weight */ |
| |
| DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, }; |
| |
| |
| /** |
| * netif_rx - post buffer to the network code |
| * @skb: buffer to post |
| * |
| * This function receives a packet from a device driver and queues it for |
| * the upper (protocol) levels to process. It always succeeds. The buffer |
| * may be dropped during processing for congestion control or by the |
| * protocol layers. |
| * |
| * return values: |
| * NET_RX_SUCCESS (no congestion) |
| * NET_RX_CN_LOW (low congestion) |
| * NET_RX_CN_MOD (moderate congestion) |
| * NET_RX_CN_HIGH (high congestion) |
| * NET_RX_DROP (packet was dropped) |
| * |
| */ |
| |
| int netif_rx(struct sk_buff *skb) |
| { |
| struct softnet_data *queue; |
| unsigned long flags; |
| |
| /* if netpoll wants it, pretend we never saw it */ |
| if (netpoll_rx(skb)) |
| return NET_RX_DROP; |
| |
| if (!skb->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 |
| |
| 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: |
| #ifdef CONFIG_NET_DMA |
| /* |
| * There may not be any more sk_buffs coming right now, so push |
| * any pending DMA copies to hardware |
| */ |
| if (net_dma_client) { |
| struct dma_chan *chan; |
| rcu_read_lock(); |
| list_for_each_entry_rcu(chan, &net_dma_client->channels, client_node) |
| dma_async_memcpy_issue_pending(chan); |
| rcu_read_unlock(); |
| } |
| #endif |
| local_irq_enable(); |
| return; |
| |
| softnet_break: |
| __get_cpu_var(netdev_rx_stat).time_squeeze++; |
| __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
| goto out; |
| } |
| |
| static gifconf_func_t * gifconf_list [NPROTO]; |
| |
| /** |
| * register_gifconf - register a SIOCGIF handler |
| * @family: Address family |
| * @gifconf: Function handler |
| * |
| * Register protocol dependent address dumping routines. The handler |
| * that is passed must not be freed or reused until it has been replaced |
| * by another handler. |
| */ |
| int register_gifconf(unsigned int family, gifconf_func_t * gifconf) |
| { |
| if (family >= NPROTO) |
| return -EINVAL; |
| gifconf_list[family] = gifconf; |
| return 0; |
| } |
| |
| |
| /* |
| * Map an interface index to its name (SIOCGIFNAME) |
| */ |
| |
| /* |
| * We need this ioctl for efficient implementation of the |
| * if_indextoname() function required by the IPv6 API. Without |
| * it, we would have to search all the interfaces to find a |
| * match. --pb |
| */ |
| |
| static int dev_ifname(struct ifreq __user *arg) |
| { |
| struct net_device *dev; |
| struct ifreq ifr; |
| |
| /* |
| * Fetch the caller's info block. |
| */ |
| |
| if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) |
| return -EFAULT; |
| |
| read_lock(&dev_base_lock); |
| dev = __dev_get_by_index(ifr.ifr_ifindex); |
| if (!dev) { |
| read_unlock(&dev_base_lock); |
| return -ENODEV; |
| } |
| |
| strcpy(ifr.ifr_name, dev->name); |
| read_unlock(&dev_base_lock); |
| |
| if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) |
| return -EFAULT; |
| return 0; |
| } |
| |
| /* |
| * Perform a SIOCGIFCONF call. This structure will change |
| * size eventually, and there is nothing I can do about it. |
| * Thus we will need a 'compatibility mode'. |
| */ |
| |
| static int dev_ifconf(char __user *arg) |
| { |
| struct ifconf ifc; |
| struct net_device *dev; |
| char __user *pos; |
| int len; |
| int total; |
| int i; |
| |
| /* |
| * Fetch the caller's info block. |
| */ |
| |
| if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) |
| return -EFAULT; |
| |
| pos = ifc.ifc_buf; |
| len = ifc.ifc_len; |
| |
| /* |
| * Loop over the interfaces, and write an info block for each. |
| */ |
| |
| total = 0; |
| for (dev = dev_base; dev; dev = dev->next) { |
| for (i = 0; i < NPROTO; i++) { |
| if (gifconf_list[i]) { |
| int done; |
| if (!pos) |
| done = gifconf_list[i](dev, NULL, 0); |
| else |
| done = gifconf_list[i](dev, pos + total, |
| len - total); |
| if (done < 0) |
| return -EFAULT; |
| total += done; |
| } |
| } |
| } |
| |
| /* |
| * All done. Write the updated control block back to the caller. |
| */ |
| ifc.ifc_len = total; |
| |
| /* |
| * Both BSD and Solaris return 0 here, so we do too. |
| */ |
| return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| /* |
| * This is invoked by the /proc filesystem handler to display a device |
| * in detail. |
| */ |
| static __inline__ struct net_device *dev_get_idx(loff_t pos) |
| { |
| struct net_device *dev; |
| loff_t i; |
| |
| for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next); |
| |
| return i == pos ? dev : NULL; |
| } |
| |
| void *dev_seq_start(struct seq_file *seq, loff_t *pos) |
| { |
| read_lock(&dev_base_lock); |
| return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN; |
| } |
| |
| void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| ++*pos; |
| return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next; |
| } |
| |
| void dev_seq_stop(struct seq_file *seq, void *v) |
| { |
| read_unlock(&dev_base_lock); |
| } |
| |
| static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) |
| { |
| if (dev->get_stats) { |
| struct net_device_stats *stats = dev->get_stats(dev); |
| |
| seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu " |
| "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n", |
| dev->name, stats->rx_bytes, stats->rx_packets, |
| stats->rx_errors, |
| stats->rx_dropped + stats->rx_missed_errors, |
| stats->rx_fifo_errors, |
| stats->rx_length_errors + stats->rx_over_errors + |
| stats->rx_crc_errors + stats->rx_frame_errors, |
| stats->rx_compressed, stats->multicast, |
| stats->tx_bytes, stats->tx_packets, |
| stats->tx_errors, stats->tx_dropped, |
| stats->tx_fifo_errors, stats->collisions, |
| stats->tx_carrier_errors + |
| stats->tx_aborted_errors + |
| stats->tx_window_errors + |
| stats->tx_heartbeat_errors, |
| stats->tx_compressed); |
| } else |
| seq_printf(seq, "%6s: No statistics available.\n", dev->name); |
| } |
| |
| /* |
| * Called from the PROCfs module. This now uses the new arbitrary sized |
| * /proc/net interface to create /proc/net/dev |
| */ |
| static int dev_seq_show(struct seq_file *seq, void *v) |
| { |
| if (v == SEQ_START_TOKEN) |
| seq_puts(seq, "Inter-| Receive " |
| " | Transmit\n" |
| " face |bytes packets errs drop fifo frame " |
| "compressed multicast|bytes packets errs " |
| "drop fifo colls carrier compressed\n"); |
| else |
| dev_seq_printf_stats(seq, v); |
| return 0; |
| } |
| |
| static struct netif_rx_stats *softnet_get_online(loff_t *pos) |
| { |
| struct netif_rx_stats *rc = NULL; |
| |
| while (*pos < NR_CPUS) |
| if (cpu_online(*pos)) { |
| rc = &per_cpu(netdev_rx_stat, *pos); |
| break; |
| } else |
| ++*pos; |
| return rc; |
| } |
| |
| static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) |
| { |
| return softnet_get_online(pos); |
| } |
| |
| static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| ++*pos; |
| return softnet_get_online(pos); |
| } |
| |
| static void softnet_seq_stop(struct seq_file *seq, void *v) |
| { |
| } |
| |
| static int softnet_seq_show(struct seq_file *seq, void *v) |
| { |
| struct netif_rx_stats *s = v; |
| |
| seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n", |
| s->total, s->dropped, s->time_squeeze, 0, |
| 0, 0, 0, 0, /* was fastroute */ |
| s->cpu_collision ); |
| return 0; |
| } |
| |
| static struct seq_operations dev_seq_ops = { |
| .start = dev_seq_start, |
| .next = dev_seq_next, |
| .stop = dev_seq_stop, |
| .show = dev_seq_show, |
| }; |
| |
| static int dev_seq_open(struct inode *inode, struct file *file) |
| { |
| return seq_open(file, &dev_seq_ops); |
| } |
| |
| static struct file_operations dev_seq_fops = { |
| .owner = THIS_MODULE, |
| .open = dev_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| |
| static struct seq_operations softnet_seq_ops = { |
| .start = softnet_seq_start, |
| .next = softnet_seq_next, |
| .stop = softnet_seq_stop, |
| .show = softnet_seq_show, |
| }; |
| |
| static int softnet_seq_open(struct inode *inode, struct file *file) |
| { |
| return seq_open(file, &softnet_seq_ops); |
| } |
| |
| static struct file_operations softnet_seq_fops = { |
| .owner = THIS_MODULE, |
| .open = softnet_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release, |
| }; |
| |
| #ifdef 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_IP_CSUM | |
| NETIF_F_NO_CSUM | |
| NETIF_F_HW_CSUM))) { |
| printk("%s: Dropping NETIF_F_SG since no checksum feature.\n", |
| dev->name); |
| dev->features &= ~NETIF_F_SG; |
| } |
| |
| /* TSO requires that SG is present as well. */ |
| if ((dev->features & NETIF_F_TSO) && |
| !(dev->features & NETIF_F_SG)) { |
| printk("%s: Dropping NETIF_F_TSO since no SG feature.\n", |
| dev->name); |
| dev->features &= ~NETIF_F_TSO; |
| } |
| 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 */ |
| |
| #ifdef CONFIG_NET_DMA |
| /** |
| * net_dma_rebalance - |
| * This is called when the number of channels allocated to the net_dma_client |
| * changes. The net_dma_client tries to have one DMA channel per CPU. |
| */ |
| static void net_dma_rebalance(void) |
| { |
| unsigned int cpu, i, n; |
| struct dma_chan *chan; |
| |
| lock_cpu_hotplug(); |
| |
| if (net_dma_count == 0) { |
| for_each_online_cpu(cpu) |
| rcu_assign_pointer(per_cpu(softnet_data.net_dma, cpu), NULL); |
| unlock_cpu_hotplug(); |
| return; |
| } |
| |
| i = 0; |
| cpu = first_cpu(cpu_online_map); |
| |
| rcu_read_lock(); |
| list_for_each_entry(chan, &net_dma_client->channels, client_node) { |
| n = ((num_online_cpus() / net_dma_count) |
| + (i < (num_online_cpus() % net_dma_count) ? 1 : 0)); |
| |
| while(n) { |
| per_cpu(softnet_data.net_dma, cpu) = chan; |
| cpu = next_cpu(cpu, cpu_online_map); |
| n--; |
| } |
| i++; |
| } |
| rcu_read_unlock(); |
| |
| unlock_cpu_hotplug(); |
| } |
| |
| /** |
| * netdev_dma_event - event callback for the net_dma_client |
| * @client: should always be net_dma_client |
| * @chan: |
| * @event: |
| */ |
| static void netdev_dma_event(struct dma_client *client, struct dma_chan *chan, |
| enum dma_event event) |
| { |
| spin_lock(&net_dma_event_lock); |
| switch (event) { |
| case DMA_RESOURCE_ADDED: |
| net_dma_count++; |
| net_dma_rebalance(); |
| break; |
| case DMA_RESOURCE_REMOVED: |
| net_dma_count--; |
| net_dma_rebalance(); |
| break; |
| default: |
| break; |
| } |
| spin_unlock(&net_dma_event_lock); |
| } |
| |
| /** |
| * netdev_dma_regiser - register the networking subsystem as a DMA client |
| */ |
| static int __init netdev_dma_register(void) |
| { |
| spin_lock_init(&net_dma_event_lock); |
| net_dma_client = dma_async_client_register(netdev_dma_event); |
| if (net_dma_client == NULL) |
| return -ENOMEM; |
| |
| dma_async_client_chan_request(net_dma_client, num_online_cpus()); |
| return 0; |
| } |
| |
| #else |
| static int __init netdev_dma_register(void) { return -ENODEV; } |
| #endif /* CONFIG_NET_DMA */ |
| |
| /* |
| * 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); |
| } |
| |
| netdev_dma_register(); |
| |
| dev_boot_phase = 0; |
| |
| open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL); |
| open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL); |
| |
| hotcpu_notifier(dev_cpu_callback, 0); |
| dst_init(); |
| dev_mcast_init(); |
| rc = 0; |
| out: |
| return rc; |
| } |
| |
| subsys_initcall(net_dev_init); |
| |
| EXPORT_SYMBOL(__dev_get_by_index); |
| EXPORT_SYMBOL(__dev_get_by_name); |
| EXPORT_SYMBOL(__dev_remove_pack); |
| EXPORT_SYMBOL(__skb_linearize); |
| EXPORT_SYMBOL(dev_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); |
| |
| #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); |