diff -Nurb linux-2.6.27.10-clickport/net/core/dev.c trellis2/net/core/dev.c --- linux-2.6.27.10-clickport/net/core/dev.c 2009-01-27 16:02:45.000000000 -0500 +++ trellis2/net/core/dev.c 2009-02-12 11:00:46.000000000 -0500 @@ -2559,7 +2559,7 @@ total = 0; for_each_netdev(net, dev) { - if (!nx_dev_visible(current->nx_info, dev)) + if (net==&init_dev && !nx_dev_visible(current->nx_info, dev)) continue; for (i = 0; i < NPROTO; i++) { if (gifconf_list[i]) { @@ -2628,8 +2628,9 @@ static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) { struct net_device_stats *stats = dev->get_stats(dev); + struct net *net = seq->private; - if (!nx_dev_visible(current->nx_info, dev)) + if (net==&init_net && !nx_dev_visible(current->nx_info, dev)) return; seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu " diff -Nurb linux-2.6.27.10-clickport/net/core/dev.c.orig trellis2/net/core/dev.c.orig --- linux-2.6.27.10-clickport/net/core/dev.c.orig 1969-12-31 19:00:00.000000000 -0500 +++ trellis2/net/core/dev.c.orig 2009-01-27 16:02:45.000000000 -0500 @@ -0,0 +1,4951 @@ +/* + * 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, + * Mark Evans, + * + * Additional Authors: + * Florian la Roche + * Alan Cox + * David Hinds + * Alexey Kuznetsov + * Adam Sulmicki + * Pekka Riikonen + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "net-sysfs.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 + */ + +#define PTYPE_HASH_SIZE (16) +#define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) + +static DEFINE_SPINLOCK(ptype_lock); +static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; +static struct list_head ptype_all __read_mostly; /* Taps */ + +#ifdef CONFIG_NET_DMA +struct net_dma { + struct dma_client client; + spinlock_t lock; + cpumask_t channel_mask; + struct dma_chan **channels; +}; + +static enum dma_state_client +netdev_dma_event(struct dma_client *client, struct dma_chan *chan, + enum dma_state state); + +static struct net_dma net_dma = { + .client = { + .event_callback = netdev_dma_event, + }, +}; +#endif + +/* + * The @dev_base_head 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_head 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. + */ +DEFINE_RWLOCK(dev_base_lock); + +EXPORT_SYMBOL(dev_base_lock); + +#define NETDEV_HASHBITS 8 +#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) + +static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) +{ + unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); + return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)]; +} + +static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) +{ + return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)]; +} + +/* Device list insertion */ +static int list_netdevice(struct net_device *dev) +{ + struct net *net = dev_net(dev); + + ASSERT_RTNL(); + + write_lock_bh(&dev_base_lock); + list_add_tail(&dev->dev_list, &net->dev_base_head); + hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name)); + hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex)); + write_unlock_bh(&dev_base_lock); + return 0; +} + +/* Device list removal */ +static void unlist_netdevice(struct net_device *dev) +{ + ASSERT_RTNL(); + + /* Unlink dev from the device chain */ + write_lock_bh(&dev_base_lock); + list_del(&dev->dev_list); + hlist_del(&dev->name_hlist); + hlist_del(&dev->index_hlist); + write_unlock_bh(&dev_base_lock); +} + +/* Click: input packet handlers, might steal packets from net_rx_action. */ +static RAW_NOTIFIER_HEAD(net_in_chain); + +/* + * 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); + +#ifdef CONFIG_LOCKDEP +/* + * register_netdevice() inits txq->_xmit_lock and sets lockdep class + * according to dev->type + */ +static const unsigned short netdev_lock_type[] = + {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, + ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, + ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, + ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, + ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, + ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, + ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, + ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, + ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, + ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, + ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, + ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, + ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211, + ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID, + ARPHRD_NONE}; + +static const char *netdev_lock_name[] = + {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", + "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", + "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", + "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", + "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", + "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", + "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", + "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", + "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", + "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", + "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", + "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", + "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211", + "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID", + "_xmit_NONE"}; + +static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; +static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; + +static inline unsigned short netdev_lock_pos(unsigned short dev_type) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) + if (netdev_lock_type[i] == dev_type) + return i; + /* the last key is used by default */ + return ARRAY_SIZE(netdev_lock_type) - 1; +} + +static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, + unsigned short dev_type) +{ + int i; + + i = netdev_lock_pos(dev_type); + lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], + netdev_lock_name[i]); +} + +static inline void netdev_set_addr_lockdep_class(struct net_device *dev) +{ + int i; + + i = netdev_lock_pos(dev->type); + lockdep_set_class_and_name(&dev->addr_list_lock, + &netdev_addr_lock_key[i], + netdev_lock_name[i]); +} +#else +static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, + unsigned short dev_type) +{ +} +static inline void netdev_set_addr_lockdep_class(struct net_device *dev) +{ +} +#endif + +/******************************************************************************* + + Protocol management and registration routines + +*******************************************************************************/ + +/* + * 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)) + list_add_rcu(&pt->list, &ptype_all); + else { + hash = ntohs(pt->type) & PTYPE_HASH_MASK; + 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)) + head = &ptype_all; + else + head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; + + 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)); + strlcpy(s[i].name, name, IFNAMSIZ); + 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] != ' ' && + !strcmp(dev->name, 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(&init_net, 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 + * @net: the applicable net namespace + * @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(struct net *net, const char *name) +{ + struct hlist_node *p; + + hlist_for_each(p, dev_name_hash(net, 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 + * @net: the applicable net namespace + * @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(struct net *net, const char *name) +{ + struct net_device *dev; + + read_lock(&dev_base_lock); + dev = __dev_get_by_name(net, name); + if (dev) + dev_hold(dev); + read_unlock(&dev_base_lock); + return dev; +} + +/** + * __dev_get_by_index - find a device by its ifindex + * @net: the applicable net namespace + * @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(struct net *net, int ifindex) +{ + struct hlist_node *p; + + hlist_for_each(p, dev_index_hash(net, 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 + * @net: the applicable net namespace + * @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(struct net *net, int ifindex) +{ + struct net_device *dev; + + read_lock(&dev_base_lock); + dev = __dev_get_by_index(net, ifindex); + if (dev) + dev_hold(dev); + read_unlock(&dev_base_lock); + return dev; +} + +/** + * dev_getbyhwaddr - find a device by its hardware address + * @net: the applicable net namespace + * @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(struct net *net, unsigned short type, char *ha) +{ + struct net_device *dev; + + ASSERT_RTNL(); + + for_each_netdev(net, dev) + if (dev->type == type && + !memcmp(dev->dev_addr, ha, dev->addr_len)) + return dev; + + return NULL; +} + +EXPORT_SYMBOL(dev_getbyhwaddr); + +struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) +{ + struct net_device *dev; + + ASSERT_RTNL(); + for_each_netdev(net, dev) + if (dev->type == type) + return dev; + + return NULL; +} + +EXPORT_SYMBOL(__dev_getfirstbyhwtype); + +struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) +{ + struct net_device *dev; + + rtnl_lock(); + dev = __dev_getfirstbyhwtype(net, type); + if (dev) + dev_hold(dev); + rtnl_unlock(); + return dev; +} + +EXPORT_SYMBOL(dev_getfirstbyhwtype); + +/** + * dev_get_by_flags - find any device with given flags + * @net: the applicable net namespace + * @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(struct net *net, unsigned short if_flags, unsigned short mask) +{ + struct net_device *dev, *ret; + + ret = NULL; + read_lock(&dev_base_lock); + for_each_netdev(net, dev) { + if (((dev->flags ^ if_flags) & mask) == 0) { + dev_hold(dev); + ret = dev; + break; + } + } + read_unlock(&dev_base_lock); + return ret; +} + +/** + * 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. We also disallow any kind of + * whitespace. + */ +int dev_valid_name(const char *name) +{ + if (*name == '\0') + return 0; + if (strlen(name) >= IFNAMSIZ) + return 0; + if (!strcmp(name, ".") || !strcmp(name, "..")) + return 0; + + while (*name) { + if (*name == '/' || isspace(*name)) + return 0; + name++; + } + return 1; +} + +/** + * __dev_alloc_name - allocate a name for a device + * @net: network namespace to allocate the device name in + * @name: name format string + * @buf: scratch buffer and result name 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. + */ + +static int __dev_alloc_name(struct net *net, const char *name, char *buf) +{ + int i = 0; + const char *p; + const int max_netdevices = 8*PAGE_SIZE; + unsigned 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 = (unsigned long *) get_zeroed_page(GFP_ATOMIC); + if (!inuse) + return -ENOMEM; + + for_each_netdev(net, d) { + 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, IFNAMSIZ, 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, IFNAMSIZ, name, i); + if (!__dev_get_by_name(net, buf)) + 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_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) +{ + char buf[IFNAMSIZ]; + struct net *net; + int ret; + + BUG_ON(!dev_net(dev)); + net = dev_net(dev); + ret = __dev_alloc_name(net, name, buf); + if (ret >= 0) + strlcpy(dev->name, buf, IFNAMSIZ); + return ret; +} + + +/** + * 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) +{ + char oldname[IFNAMSIZ]; + int err = 0; + int ret; + struct net *net; + + ASSERT_RTNL(); + BUG_ON(!dev_net(dev)); + + net = dev_net(dev); + if (dev->flags & IFF_UP) + return -EBUSY; + + if (!dev_valid_name(newname)) + return -EINVAL; + + if (strncmp(newname, dev->name, IFNAMSIZ) == 0) + return 0; + + memcpy(oldname, dev->name, IFNAMSIZ); + + if (strchr(newname, '%')) { + err = dev_alloc_name(dev, newname); + if (err < 0) + return err; + strcpy(newname, dev->name); + } + else if (__dev_get_by_name(net, newname)) + return -EEXIST; + else + strlcpy(dev->name, newname, IFNAMSIZ); + +rollback: + /* For now only devices in the initial network namespace + * are in sysfs. + */ + if (net == &init_net) { + ret = device_rename(&dev->dev, dev->name); + if (ret) { + memcpy(dev->name, oldname, IFNAMSIZ); + return ret; + } + } + + write_lock_bh(&dev_base_lock); + hlist_del(&dev->name_hlist); + hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name)); + write_unlock_bh(&dev_base_lock); + + ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); + ret = notifier_to_errno(ret); + + if (ret) { + if (err) { + printk(KERN_ERR + "%s: name change rollback failed: %d.\n", + dev->name, ret); + } else { + err = ret; + memcpy(dev->name, oldname, IFNAMSIZ); + goto rollback; + } + } + + 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) +{ + call_netdevice_notifiers(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) { + call_netdevice_notifiers(NETDEV_CHANGE, dev); + rtmsg_ifinfo(RTM_NEWLINK, dev, 0); + } +} + +void netdev_bonding_change(struct net_device *dev) +{ + call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev); +} +EXPORT_SYMBOL(netdev_bonding_change); + +/** + * dev_load - load a network module + * @net: the applicable net namespace + * @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(struct net *net, const char *name) +{ + struct net_device *dev; + + read_lock(&dev_base_lock); + dev = __dev_get_by_name(net, name); + read_unlock(&dev_base_lock); + + if (!dev && capable(CAP_SYS_MODULE)) + request_module("%s", name); +} + +/** + * 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; + + ASSERT_RTNL(); + + /* + * 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->validate_addr) + ret = dev->validate_addr(dev); + + if (!ret && dev->open) + ret = dev->open(dev); + + /* + * If it went open OK then: + */ + + if (ret) + clear_bit(__LINK_STATE_START, &dev->state); + else { + /* + * Set the flags. + */ + dev->flags |= IFF_UP; + + /* + * Initialize multicasting status + */ + dev_set_rx_mode(dev); + + /* + * Wakeup transmit queue engine + */ + dev_activate(dev); + + /* + * ... and announce new interface. + */ + call_netdevice_notifiers(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) +{ + ASSERT_RTNL(); + + might_sleep(); + + 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. + */ + call_netdevice_notifiers(NETDEV_GOING_DOWN, 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(). + * + * dev->stop() will invoke napi_disable() on all of it's + * napi_struct instances on this device. + */ + smp_mb__after_clear_bit(); /* Commit netif_running(). */ + + dev_deactivate(dev); + + /* + * 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 + */ + call_netdevice_notifiers(NETDEV_DOWN, dev); + + return 0; +} + + +/** + * dev_disable_lro - disable Large Receive Offload on a device + * @dev: device + * + * Disable Large Receive Offload (LRO) on a net device. Must be + * called under RTNL. This is needed if received packets may be + * forwarded to another interface. + */ +void dev_disable_lro(struct net_device *dev) +{ + if (dev->ethtool_ops && dev->ethtool_ops->get_flags && + dev->ethtool_ops->set_flags) { + u32 flags = dev->ethtool_ops->get_flags(dev); + if (flags & ETH_FLAG_LRO) { + flags &= ~ETH_FLAG_LRO; + dev->ethtool_ops->set_flags(dev, flags); + } + } + WARN_ON(dev->features & NETIF_F_LRO); +} +EXPORT_SYMBOL(dev_disable_lro); + + +static int dev_boot_phase = 1; + +/* + * 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; + struct net_device *last; + struct net *net; + int err; + + rtnl_lock(); + err = raw_notifier_chain_register(&netdev_chain, nb); + if (err) + goto unlock; + if (dev_boot_phase) + goto unlock; + for_each_net(net) { + for_each_netdev(net, dev) { + err = nb->notifier_call(nb, NETDEV_REGISTER, dev); + err = notifier_to_errno(err); + if (err) + goto rollback; + + if (!(dev->flags & IFF_UP)) + continue; + + nb->notifier_call(nb, NETDEV_UP, dev); + } + } + +unlock: + rtnl_unlock(); + return err; + +rollback: + last = dev; + for_each_net(net) { + for_each_netdev(net, dev) { + if (dev == last) + break; + + if (dev->flags & IFF_UP) { + nb->notifier_call(nb, NETDEV_GOING_DOWN, dev); + nb->notifier_call(nb, NETDEV_DOWN, dev); + } + nb->notifier_call(nb, NETDEV_UNREGISTER, dev); + } + } + + raw_notifier_chain_unregister(&netdev_chain, nb); + goto unlock; +} + +/** + * 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 + * @dev: net_device 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, struct net_device *dev) +{ + return raw_notifier_call_chain(&netdev_chain, val, dev); +} + +/* When > 0 there are consumers of rx skb time stamps */ +static atomic_t netstamp_needed = ATOMIC_INIT(0); + +void net_enable_timestamp(void) +{ + atomic_inc(&netstamp_needed); +} + +void net_disable_timestamp(void) +{ + atomic_dec(&netstamp_needed); +} + +static inline void net_timestamp(struct sk_buff *skb) +{ + if (atomic_read(&netstamp_needed)) + __net_timestamp(skb); + else + skb->tstamp.tv64 = 0; +} + +/* + * Support routine. Sends outgoing frames to any network + * taps currently in use. + */ + +static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) +{ + struct packet_type *ptype; + + net_timestamp(skb); + + rcu_read_lock(); + list_for_each_entry_rcu(ptype, &ptype_all, list) { + /* Never send packets back to the socket + * they originated from - MvS (miquels@drinkel.ow.org) + */ + if ((ptype->dev == dev || !ptype->dev) && + (ptype->af_packet_priv == NULL || + (struct sock *)ptype->af_packet_priv != skb->sk)) { + struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC); + if (!skb2) + break; + + /* skb->nh should be correctly + set by sender, so that the second statement is + just protection against buggy protocols. + */ + skb_reset_mac_header(skb2); + + if (skb_network_header(skb2) < skb2->data || + skb2->network_header > skb2->tail) { + if (net_ratelimit()) + printk(KERN_CRIT "protocol %04x is " + "buggy, dev %s\n", + skb2->protocol, dev->name); + skb_reset_network_header(skb2); + } + + skb2->transport_header = skb2->network_header; + skb2->pkt_type = PACKET_OUTGOING; + ptype->func(skb2, skb->dev, ptype, skb->dev); + } + } + rcu_read_unlock(); +} + + +static inline void __netif_reschedule(struct Qdisc *q) +{ + struct softnet_data *sd; + unsigned long flags; + + local_irq_save(flags); + sd = &__get_cpu_var(softnet_data); + q->next_sched = sd->output_queue; + sd->output_queue = q; + raise_softirq_irqoff(NET_TX_SOFTIRQ); + local_irq_restore(flags); +} + +void __netif_schedule(struct Qdisc *q) +{ + if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) + __netif_reschedule(q); +} +EXPORT_SYMBOL(__netif_schedule); + +void dev_kfree_skb_irq(struct sk_buff *skb) +{ + if (atomic_dec_and_test(&skb->users)) { + struct softnet_data *sd; + unsigned long flags; + + local_irq_save(flags); + sd = &__get_cpu_var(softnet_data); + skb->next = sd->completion_queue; + sd->completion_queue = skb; + raise_softirq_irqoff(NET_TX_SOFTIRQ); + local_irq_restore(flags); + } +} +EXPORT_SYMBOL(dev_kfree_skb_irq); + +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); + + +/** + * netif_device_detach - mark device as removed + * @dev: network device + * + * Mark device as removed from system and therefore no longer available. + */ +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); + +/** + * netif_device_attach - mark device as attached + * @dev: network device + * + * Mark device as attached from system and restart if needed. + */ +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); + +static bool can_checksum_protocol(unsigned long features, __be16 protocol) +{ + return ((features & NETIF_F_GEN_CSUM) || + ((features & NETIF_F_IP_CSUM) && + protocol == htons(ETH_P_IP)) || + ((features & NETIF_F_IPV6_CSUM) && + protocol == htons(ETH_P_IPV6))); +} + +static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb) +{ + if (can_checksum_protocol(dev->features, skb->protocol)) + return true; + + if (skb->protocol == htons(ETH_P_8021Q)) { + struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; + if (can_checksum_protocol(dev->features & dev->vlan_features, + veh->h_vlan_encapsulated_proto)) + return true; + } + + return false; +} + +/* + * Invalidate hardware checksum when packet is to be mangled, and + * complete checksum manually on outgoing path. + */ +int skb_checksum_help(struct sk_buff *skb) +{ + __wsum csum; + int ret = 0, offset; + + if (skb->ip_summed == CHECKSUM_COMPLETE) + goto out_set_summed; + + if (unlikely(skb_shinfo(skb)->gso_size)) { + /* Let GSO fix up the checksum. */ + goto out_set_summed; + } + + offset = skb->csum_start - skb_headroom(skb); + BUG_ON(offset >= skb_headlen(skb)); + csum = skb_checksum(skb, offset, skb->len - offset, 0); + + offset += skb->csum_offset; + BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); + + if (skb_cloned(skb) && + !skb_clone_writable(skb, offset + sizeof(__sum16))) { + ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); + if (ret) + goto out; + } + + *(__sum16 *)(skb->data + offset) = csum_fold(csum); +out_set_summed: + skb->ip_summed = CHECKSUM_NONE; +out: + return ret; +} + +/** + * skb_gso_segment - Perform segmentation on skb. + * @skb: buffer to segment + * @features: features for the output path (see dev->features) + * + * This function segments the given skb and returns a list of segments. + * + * It may return NULL if the skb requires no segmentation. This is + * only possible when GSO is used for verifying header integrity. + */ +struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features) +{ + struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); + struct packet_type *ptype; + __be16 type = skb->protocol; + int err; + + BUG_ON(skb_shinfo(skb)->frag_list); + + skb_reset_mac_header(skb); + skb->mac_len = skb->network_header - skb->mac_header; + __skb_pull(skb, skb->mac_len); + + if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) { + if (skb_header_cloned(skb) && + (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) + return ERR_PTR(err); + } + + rcu_read_lock(); + list_for_each_entry_rcu(ptype, + &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { + if (ptype->type == type && !ptype->dev && ptype->gso_segment) { + if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { + err = ptype->gso_send_check(skb); + segs = ERR_PTR(err); + if (err || skb_gso_ok(skb, features)) + break; + __skb_push(skb, (skb->data - + skb_network_header(skb))); + } + segs = ptype->gso_segment(skb, features); + break; + } + } + rcu_read_unlock(); + + __skb_push(skb, skb->data - skb_mac_header(skb)); + + return segs; +} + +EXPORT_SYMBOL(skb_gso_segment); + +/* Take action when hardware reception checksum errors are detected. */ +#ifdef CONFIG_BUG +void netdev_rx_csum_fault(struct net_device *dev) +{ + if (net_ratelimit()) { + printk(KERN_ERR "%s: hw csum failure.\n", + dev ? dev->name : ""); + dump_stack(); + } +} +EXPORT_SYMBOL(netdev_rx_csum_fault); +#endif + +/* 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) +{ +#ifdef CONFIG_HIGHMEM + 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; + +#endif + return 0; +} + +struct dev_gso_cb { + void (*destructor)(struct sk_buff *skb); +}; + +#define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) + +static void dev_gso_skb_destructor(struct sk_buff *skb) +{ + struct dev_gso_cb *cb; + + do { + struct sk_buff *nskb = skb->next; + + skb->next = nskb->next; + nskb->next = NULL; + kfree_skb(nskb); + } while (skb->next); + + cb = DEV_GSO_CB(skb); + if (cb->destructor) + cb->destructor(skb); +} + +/** + * dev_gso_segment - Perform emulated hardware segmentation on skb. + * @skb: buffer to segment + * + * This function segments the given skb and stores the list of segments + * in skb->next. + */ +static int dev_gso_segment(struct sk_buff *skb) +{ + struct net_device *dev = skb->dev; + struct sk_buff *segs; + int features = dev->features & ~(illegal_highdma(dev, skb) ? + NETIF_F_SG : 0); + + segs = skb_gso_segment(skb, features); + + /* Verifying header integrity only. */ + if (!segs) + return 0; + + if (IS_ERR(segs)) + return PTR_ERR(segs); + + skb->next = segs; + DEV_GSO_CB(skb)->destructor = skb->destructor; + skb->destructor = dev_gso_skb_destructor; + + return 0; +} + +int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, + struct netdev_queue *txq) +{ + if (likely(!skb->next)) { + if (!list_empty(&ptype_all)) + dev_queue_xmit_nit(skb, dev); + + if (netif_needs_gso(dev, skb)) { + if (unlikely(dev_gso_segment(skb))) + goto out_kfree_skb; + if (skb->next) + goto gso; + } + + return dev->hard_start_xmit(skb, dev); + } + +gso: + do { + struct sk_buff *nskb = skb->next; + int rc; + + skb->next = nskb->next; + nskb->next = NULL; + rc = dev->hard_start_xmit(nskb, dev); + if (unlikely(rc)) { + nskb->next = skb->next; + skb->next = nskb; + return rc; + } + if (unlikely(netif_tx_queue_stopped(txq) && skb->next)) + return NETDEV_TX_BUSY; + } while (skb->next); + + skb->destructor = DEV_GSO_CB(skb)->destructor; + +out_kfree_skb: + kfree_skb(skb); + return 0; +} + +static u32 simple_tx_hashrnd; +static int simple_tx_hashrnd_initialized = 0; + +static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb) +{ + u32 addr1, addr2, ports; + u32 hash, ihl; + u8 ip_proto = 0; + + if (unlikely(!simple_tx_hashrnd_initialized)) { + get_random_bytes(&simple_tx_hashrnd, 4); + simple_tx_hashrnd_initialized = 1; + } + + switch (skb->protocol) { + case __constant_htons(ETH_P_IP): + if (!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET))) + ip_proto = ip_hdr(skb)->protocol; + addr1 = ip_hdr(skb)->saddr; + addr2 = ip_hdr(skb)->daddr; + ihl = ip_hdr(skb)->ihl; + break; + case __constant_htons(ETH_P_IPV6): + ip_proto = ipv6_hdr(skb)->nexthdr; + addr1 = ipv6_hdr(skb)->saddr.s6_addr32[3]; + addr2 = ipv6_hdr(skb)->daddr.s6_addr32[3]; + ihl = (40 >> 2); + break; + default: + return 0; + } + + + switch (ip_proto) { + case IPPROTO_TCP: + case IPPROTO_UDP: + case IPPROTO_DCCP: + case IPPROTO_ESP: + case IPPROTO_AH: + case IPPROTO_SCTP: + case IPPROTO_UDPLITE: + ports = *((u32 *) (skb_network_header(skb) + (ihl * 4))); + break; + + default: + ports = 0; + break; + } + + hash = jhash_3words(addr1, addr2, ports, simple_tx_hashrnd); + + return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32); +} + +static struct netdev_queue *dev_pick_tx(struct net_device *dev, + struct sk_buff *skb) +{ + u16 queue_index = 0; + + if (dev->select_queue) + queue_index = dev->select_queue(dev, skb); + else if (dev->real_num_tx_queues > 1) + queue_index = simple_tx_hash(dev, skb); + + skb_set_queue_mapping(skb, queue_index); + return netdev_get_tx_queue(dev, queue_index); +} + +/** + * 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 netdev_queue *txq; + struct Qdisc *q; + int rc = -ENOMEM; + + /* GSO will handle the following emulations directly. */ + if (netif_needs_gso(dev, skb)) + goto gso; + + if (skb_shinfo(skb)->frag_list && + !(dev->features & NETIF_F_FRAGLIST) && + __skb_linearize(skb)) + goto out_kfree_skb; + + /* Fragmented skb is linearized if device does not support SG, + * or if at least one of fragments is in highmem and device + * does not support DMA from it. + */ + if (skb_shinfo(skb)->nr_frags && + (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) && + __skb_linearize(skb)) + goto out_kfree_skb; + + /* If packet is not checksummed and device does not support + * checksumming for this protocol, complete checksumming here. + */ + if (skb->ip_summed == CHECKSUM_PARTIAL) { + skb_set_transport_header(skb, skb->csum_start - + skb_headroom(skb)); + if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb)) + goto out_kfree_skb; + } + +gso: + /* Disable soft irqs for various locks below. Also + * stops preemption for RCU. + */ + rcu_read_lock_bh(); + + txq = dev_pick_tx(dev, skb); + q = rcu_dereference(txq->qdisc); + +#ifdef CONFIG_NET_CLS_ACT + skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS); +#endif + if (q->enqueue) { + spinlock_t *root_lock = qdisc_lock(q); + + spin_lock(root_lock); + + if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { + kfree_skb(skb); + rc = NET_XMIT_DROP; + } else { + rc = qdisc_enqueue_root(skb, q); + qdisc_run(q); + } + spin_unlock(root_lock); + + 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 (txq->xmit_lock_owner != cpu) { + + HARD_TX_LOCK(dev, txq, cpu); + + if (!netif_tx_queue_stopped(txq)) { + rc = 0; + if (!dev_hard_start_xmit(skb, dev, txq)) { + HARD_TX_UNLOCK(dev, txq); + goto out; + } + } + HARD_TX_UNLOCK(dev, txq); + if (net_ratelimit()) + printk(KERN_CRIT "Virtual device %s asks to " + "queue packet!\n", dev->name); + } else { + /* Recursion is detected! It is possible, + * unfortunately */ + if (net_ratelimit()) + printk(KERN_CRIT "Dead loop on virtual device " + "%s, fix it urgently!\n", dev->name); + } + } + + rc = -ENETDOWN; + rcu_read_unlock_bh(); + +out_kfree_skb: + kfree_skb(skb); + return rc; +out: + rcu_read_unlock_bh(); + return rc; +} + + +/*======================================================================= + Receiver routines + =======================================================================*/ + +int netdev_max_backlog __read_mostly = 1000; +int netdev_budget __read_mostly = 300; +int weight_p __read_mostly = 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_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.tv64) + 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: + __skb_queue_tail(&queue->input_pkt_queue, skb); + local_irq_restore(flags); + return NET_RX_SUCCESS; + } + + napi_schedule(&queue->backlog); + 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 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; + + WARN_ON(atomic_read(&skb->users)); + __kfree_skb(skb); + } + } + + if (sd->output_queue) { + struct Qdisc *head; + + local_irq_disable(); + head = sd->output_queue; + sd->output_queue = NULL; + local_irq_enable(); + + while (head) { + struct Qdisc *q = head; + spinlock_t *root_lock; + + head = head->next_sched; + + root_lock = qdisc_lock(q); + if (spin_trylock(root_lock)) { + smp_mb__before_clear_bit(); + clear_bit(__QDISC_STATE_SCHED, + &q->state); + qdisc_run(q); + spin_unlock(root_lock); + } else { + if (!test_bit(__QDISC_STATE_DEACTIVATED, + &q->state)) { + __netif_reschedule(q); + } else { + smp_mb__before_clear_bit(); + clear_bit(__QDISC_STATE_SCHED, + &q->state); + } + } + } + } +} + +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); +} + + +/* + * Click: Allow Click to ask to intercept input packets. + */ +int +register_net_in(struct notifier_block *nb) +{ + int err; + rtnl_lock(); + err = raw_notifier_chain_register(&net_in_chain, nb); + rtnl_unlock(); + return err; +} + +int +unregister_net_in(struct notifier_block *nb) +{ + int err; + rtnl_lock(); + err = raw_notifier_chain_unregister(&net_in_chain, nb); + rtnl_unlock(); + return err; +} + + +#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE) +/* These hooks defined here for ATM */ +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) __read_mostly; + +/* + * If bridge module is loaded call bridging hook. + * returns NULL if packet was consumed. + */ +struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p, + struct sk_buff *skb) __read_mostly; +static inline struct sk_buff *handle_bridge(struct sk_buff *skb, + struct packet_type **pt_prev, int *ret, + struct net_device *orig_dev) +{ + struct net_bridge_port *port; + + if (skb->pkt_type == PACKET_LOOPBACK || + (port = rcu_dereference(skb->dev->br_port)) == NULL) + return skb; + + if (*pt_prev) { + *ret = deliver_skb(skb, *pt_prev, orig_dev); + *pt_prev = NULL; + } + + return br_handle_frame_hook(port, skb); +} +#else +#define handle_bridge(skb, pt_prev, ret, orig_dev) (skb) +#endif + +#if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE) +struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly; +EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook); + +static inline struct sk_buff *handle_macvlan(struct sk_buff *skb, + struct packet_type **pt_prev, + int *ret, + struct net_device *orig_dev) +{ + if (skb->dev->macvlan_port == NULL) + return skb; + + if (*pt_prev) { + *ret = deliver_skb(skb, *pt_prev, orig_dev); + *pt_prev = NULL; + } + return macvlan_handle_frame_hook(skb); +} +#else +#define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb) +#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 net_device *dev = skb->dev; + u32 ttl = G_TC_RTTL(skb->tc_verd); + struct netdev_queue *rxq; + int result = TC_ACT_OK; + struct Qdisc *q; + + if (MAX_RED_LOOP < ttl++) { + printk(KERN_WARNING + "Redir loop detected Dropping packet (%d->%d)\n", + skb->iif, dev->ifindex); + 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); + + rxq = &dev->rx_queue; + + q = rxq->qdisc; + if (q != &noop_qdisc) { + spin_lock(qdisc_lock(q)); + if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) + result = qdisc_enqueue_root(skb, q); + spin_unlock(qdisc_lock(q)); + } + + return result; +} + +static inline struct sk_buff *handle_ing(struct sk_buff *skb, + struct packet_type **pt_prev, + int *ret, struct net_device *orig_dev) +{ + if (skb->dev->rx_queue.qdisc == &noop_qdisc) + goto out; + + if (*pt_prev) { + *ret = deliver_skb(skb, *pt_prev, orig_dev); + *pt_prev = NULL; + } else { + /* Huh? Why does turning on AF_PACKET affect this? */ + skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); + } + + switch (ing_filter(skb)) { + case TC_ACT_SHOT: + case TC_ACT_STOLEN: + kfree_skb(skb); + return NULL; + } + +out: + skb->tc_verd = 0; + return skb; +} +#endif + +/* + * netif_nit_deliver - deliver received packets to network taps + * @skb: buffer + * + * This function is used to deliver incoming packets to network + * taps. It should be used when the normal netif_receive_skb path + * is bypassed, for example because of VLAN acceleration. + */ +void netif_nit_deliver(struct sk_buff *skb) +{ + struct packet_type *ptype; + + if (list_empty(&ptype_all)) + return; + + skb_reset_network_header(skb); + skb_reset_transport_header(skb); + skb->mac_len = skb->network_header - skb->mac_header; + + rcu_read_lock(); + list_for_each_entry_rcu(ptype, &ptype_all, list) { + if (!ptype->dev || ptype->dev == skb->dev) + deliver_skb(skb, ptype, skb->dev); + } + rcu_read_unlock(); +} + +/** + * netif_receive_skb - process receive buffer from network + * @skb: buffer to process + * + * netif_receive_skb() is the main receive data processing function. + * It always succeeds. The buffer may be dropped during processing + * for congestion control or by the protocol layers. + * + * This function may only be called from softirq context and interrupts + * should be enabled. + * + * Return values (usually ignored): + * NET_RX_SUCCESS: no congestion + * NET_RX_DROP: packet was dropped + */ +//int netif_receive_skb(struct sk_buff *skb) +int __netif_receive_skb(struct sk_buff *skb, unsigned short type, int notifier_data) +{ + struct packet_type *ptype, *pt_prev; + struct net_device *orig_dev; + struct net_device *null_or_orig; + int ret = NET_RX_DROP; +// __be16 type; + + /* if we've gotten here through NAPI, check netpoll */ + if (netpoll_receive_skb(skb)) + return NET_RX_DROP; + + if (!skb->tstamp.tv64) + net_timestamp(skb); + + if (!skb->iif) + skb->iif = skb->dev->ifindex; + + null_or_orig = NULL; + orig_dev = skb->dev; + if (orig_dev->master) { + if (skb_bond_should_drop(skb)) + null_or_orig = orig_dev; /* deliver only exact match */ + else + skb->dev = orig_dev->master; + } + + __get_cpu_var(netdev_rx_stat).total++; + + skb_reset_network_header(skb); + skb_reset_transport_header(skb); + skb->mac_len = skb->network_header - skb->mac_header; + + /* Click: may want to steal the packet */ + if (notifier_data >= 0 + && raw_notifier_call_chain(&net_in_chain, + notifier_data, + skb) & NOTIFY_STOP_MASK) { + return ret; + } + + pt_prev = NULL; + + rcu_read_lock(); + + /* Don't receive packets in an exiting network namespace */ + if (!net_alive(dev_net(skb->dev))) + goto out; + +#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 == null_or_orig || ptype->dev == skb->dev || + ptype->dev == orig_dev) { + if (pt_prev) + ret = deliver_skb(skb, pt_prev, orig_dev); + pt_prev = ptype; + } + } + +#ifdef CONFIG_NET_CLS_ACT + skb = handle_ing(skb, &pt_prev, &ret, orig_dev); + if (!skb) + goto out; +ncls: +#endif + + skb = handle_bridge(skb, &pt_prev, &ret, orig_dev); + if (!skb) + goto out; + skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev); + if (!skb) + goto out; + + type = skb->protocol; + list_for_each_entry_rcu(ptype, + &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { + if (ptype->type == type && + (ptype->dev == null_or_orig || ptype->dev == skb->dev || + ptype->dev == orig_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; +} + +/* Network device is going away, flush any packets still pending */ +static void flush_backlog(void *arg) +{ + struct net_device *dev = arg; + struct softnet_data *queue = &__get_cpu_var(softnet_data); + struct sk_buff *skb, *tmp; + + skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp) + if (skb->dev == dev) { + __skb_unlink(skb, &queue->input_pkt_queue); + kfree_skb(skb); + } +} + +static int process_backlog(struct napi_struct *napi, int quota) +{ + int work = 0; + struct softnet_data *queue = &__get_cpu_var(softnet_data); + unsigned long start_time = jiffies; + + napi->weight = weight_p; + do { + struct sk_buff *skb; + + local_irq_disable(); + skb = __skb_dequeue(&queue->input_pkt_queue); + if (!skb) { + __napi_complete(napi); + local_irq_enable(); + break; + } + local_irq_enable(); + + __netif_receive_skb(skb, skb->protocol, skb_queue_len(&queue->input_pkt_queue)); +//XXX netif_receive_skb(skb); + } while (++work < quota && jiffies == start_time); + + return work; +} + +/** + * __napi_schedule - schedule for receive + * @n: entry to schedule + * + * The entry's receive function will be scheduled to run + */ +void __napi_schedule(struct napi_struct *n) +{ + unsigned long flags; + + local_irq_save(flags); + list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list); + __raise_softirq_irqoff(NET_RX_SOFTIRQ); + local_irq_restore(flags); +} +EXPORT_SYMBOL(__napi_schedule); + + +static void net_rx_action(struct softirq_action *h) +{ + struct list_head *list = &__get_cpu_var(softnet_data).poll_list; + unsigned long start_time = jiffies; + int budget = netdev_budget; + void *have; + + local_irq_disable(); + + while (!list_empty(list)) { + struct napi_struct *n; + int work, weight; + + /* If softirq window is exhuasted then punt. + * + * Note that this is a slight policy change from the + * previous NAPI code, which would allow up to 2 + * jiffies to pass before breaking out. The test + * used to be "jiffies - start_time > 1". + */ + if (unlikely(budget <= 0 || jiffies != start_time)) + goto softnet_break; + + local_irq_enable(); + + /* Even though interrupts have been re-enabled, this + * access is safe because interrupts can only add new + * entries to the tail of this list, and only ->poll() + * calls can remove this head entry from the list. + */ + n = list_entry(list->next, struct napi_struct, poll_list); + + have = netpoll_poll_lock(n); + + weight = n->weight; + + /* This NAPI_STATE_SCHED test is for avoiding a race + * with netpoll's poll_napi(). Only the entity which + * obtains the lock and sees NAPI_STATE_SCHED set will + * actually make the ->poll() call. Therefore we avoid + * accidently calling ->poll() when NAPI is not scheduled. + */ + work = 0; + if (test_bit(NAPI_STATE_SCHED, &n->state)) + work = n->poll(n, weight); + + WARN_ON_ONCE(work > weight); + + budget -= work; + + local_irq_disable(); + + /* Drivers must not modify the NAPI state if they + * consume the entire weight. In such cases this code + * still "owns" the NAPI instance and therefore can + * move the instance around on the list at-will. + */ + if (unlikely(work == weight)) { + if (unlikely(napi_disable_pending(n))) + __napi_complete(n); + else + list_move_tail(&n->poll_list, list); + } + + netpoll_poll_unlock(have); + } +out: + local_irq_enable(); + +#ifdef CONFIG_NET_DMA + /* + * There may not be any more sk_buffs coming right now, so push + * any pending DMA copies to hardware + */ + if (!cpus_empty(net_dma.channel_mask)) { + int chan_idx; + for_each_cpu_mask_nr(chan_idx, net_dma.channel_mask) { + struct dma_chan *chan = net_dma.channels[chan_idx]; + if (chan) + dma_async_memcpy_issue_pending(chan); + } + } +#endif + + 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 net *net, 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(net, 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(struct net *net, 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_each_netdev(net, dev) { + if (!nx_dev_visible(current->nx_info, dev)) + continue; + for (i = 0; i < NPROTO; i++) { + if (gifconf_list[i]) { + int done; + if (!pos) + done = gifconf_list[i](dev, NULL, 0); + else + done = gifconf_list[i](dev, pos + total, + len - total); + if (done < 0) + return -EFAULT; + total += done; + } + } + } + + /* + * All done. Write the updated control block back to the caller. + */ + ifc.ifc_len = total; + + /* + * Both BSD and Solaris return 0 here, so we do too. + */ + return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; +} + +#ifdef CONFIG_PROC_FS +/* + * This is invoked by the /proc filesystem handler to display a device + * in detail. + */ +void *dev_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(dev_base_lock) +{ + struct net *net = seq_file_net(seq); + loff_t off; + struct net_device *dev; + + read_lock(&dev_base_lock); + if (!*pos) + return SEQ_START_TOKEN; + + off = 1; + for_each_netdev(net, dev) + if (off++ == *pos) + return dev; + + return NULL; +} + +void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct net *net = seq_file_net(seq); + ++*pos; + return v == SEQ_START_TOKEN ? + first_net_device(net) : next_net_device((struct net_device *)v); +} + +void dev_seq_stop(struct seq_file *seq, void *v) + __releases(dev_base_lock) +{ + read_unlock(&dev_base_lock); +} + +static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) +{ + struct net_device_stats *stats = dev->get_stats(dev); + + if (!nx_dev_visible(current->nx_info, dev)) + return; + + 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); +} + +/* + * 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_cpu_ids) + 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 const 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_net(inode, file, &dev_seq_ops, + sizeof(struct seq_net_private)); +} + +static const struct file_operations dev_seq_fops = { + .owner = THIS_MODULE, + .open = dev_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_net, +}; + +static const 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 const struct file_operations softnet_seq_fops = { + .owner = THIS_MODULE, + .open = softnet_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static void *ptype_get_idx(loff_t pos) +{ + struct packet_type *pt = NULL; + loff_t i = 0; + int t; + + list_for_each_entry_rcu(pt, &ptype_all, list) { + if (i == pos) + return pt; + ++i; + } + + for (t = 0; t < PTYPE_HASH_SIZE; t++) { + list_for_each_entry_rcu(pt, &ptype_base[t], list) { + if (i == pos) + return pt; + ++i; + } + } + return NULL; +} + +static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(RCU) +{ + rcu_read_lock(); + return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; +} + +static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct packet_type *pt; + struct list_head *nxt; + int hash; + + ++*pos; + if (v == SEQ_START_TOKEN) + return ptype_get_idx(0); + + pt = v; + nxt = pt->list.next; + if (pt->type == htons(ETH_P_ALL)) { + if (nxt != &ptype_all) + goto found; + hash = 0; + nxt = ptype_base[0].next; + } else + hash = ntohs(pt->type) & PTYPE_HASH_MASK; + + while (nxt == &ptype_base[hash]) { + if (++hash >= PTYPE_HASH_SIZE) + return NULL; + nxt = ptype_base[hash].next; + } +found: + return list_entry(nxt, struct packet_type, list); +} + +static void ptype_seq_stop(struct seq_file *seq, void *v) + __releases(RCU) +{ + rcu_read_unlock(); +} + +static void ptype_seq_decode(struct seq_file *seq, void *sym) +{ +#ifdef CONFIG_KALLSYMS + unsigned long offset = 0, symsize; + const char *symname; + char *modname; + char namebuf[128]; + + symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset, + &modname, namebuf); + + if (symname) { + char *delim = ":"; + + if (!modname) + modname = delim = ""; + seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim, + symname, offset); + return; + } +#endif + + seq_printf(seq, "[%p]", sym); +} + +static int ptype_seq_show(struct seq_file *seq, void *v) +{ + struct packet_type *pt = v; + + if (v == SEQ_START_TOKEN) + seq_puts(seq, "Type Device Function\n"); + else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) { + if (pt->type == htons(ETH_P_ALL)) + seq_puts(seq, "ALL "); + else + seq_printf(seq, "%04x", ntohs(pt->type)); + + seq_printf(seq, " %-8s ", + pt->dev ? pt->dev->name : ""); + ptype_seq_decode(seq, pt->func); + seq_putc(seq, '\n'); + } + + return 0; +} + +static const struct seq_operations ptype_seq_ops = { + .start = ptype_seq_start, + .next = ptype_seq_next, + .stop = ptype_seq_stop, + .show = ptype_seq_show, +}; + +static int ptype_seq_open(struct inode *inode, struct file *file) +{ + return seq_open_net(inode, file, &ptype_seq_ops, + sizeof(struct seq_net_private)); +} + +static const struct file_operations ptype_seq_fops = { + .owner = THIS_MODULE, + .open = ptype_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_net, +}; + + +static int __net_init dev_proc_net_init(struct net *net) +{ + int rc = -ENOMEM; + + if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops)) + goto out; + if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops)) + goto out_dev; + if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops)) + goto out_softnet; + + if (wext_proc_init(net)) + goto out_ptype; + rc = 0; +out: + return rc; +out_ptype: + proc_net_remove(net, "ptype"); +out_softnet: + proc_net_remove(net, "softnet_stat"); +out_dev: + proc_net_remove(net, "dev"); + goto out; +} + +static void __net_exit dev_proc_net_exit(struct net *net) +{ + wext_proc_exit(net); + + proc_net_remove(net, "ptype"); + proc_net_remove(net, "softnet_stat"); + proc_net_remove(net, "dev"); +} + +static struct pernet_operations __net_initdata dev_proc_ops = { + .init = dev_proc_net_init, + .exit = dev_proc_net_exit, +}; + +static int __init dev_proc_init(void) +{ + return register_pernet_subsys(&dev_proc_ops); +} +#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; +} + +static void dev_change_rx_flags(struct net_device *dev, int flags) +{ + if (dev->flags & IFF_UP && dev->change_rx_flags) + dev->change_rx_flags(dev, flags); +} + +static int __dev_set_promiscuity(struct net_device *dev, int inc) +{ + unsigned short old_flags = dev->flags; + + ASSERT_RTNL(); + + dev->flags |= IFF_PROMISC; + dev->promiscuity += inc; + if (dev->promiscuity == 0) { + /* + * Avoid overflow. + * If inc causes overflow, untouch promisc and return error. + */ + if (inc < 0) + dev->flags &= ~IFF_PROMISC; + else { + dev->promiscuity -= inc; + printk(KERN_WARNING "%s: promiscuity touches roof, " + "set promiscuity failed, promiscuity feature " + "of device might be broken.\n", dev->name); + return -EOVERFLOW; + } + } + if (dev->flags != old_flags) { + printk(KERN_INFO "device %s %s promiscuous mode\n", + dev->name, (dev->flags & IFF_PROMISC) ? "entered" : + "left"); + if (audit_enabled) + audit_log(current->audit_context, GFP_ATOMIC, + AUDIT_ANOM_PROMISCUOUS, + "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", + dev->name, (dev->flags & IFF_PROMISC), + (old_flags & IFF_PROMISC), + audit_get_loginuid(current), + current->uid, current->gid, + audit_get_sessionid(current)); + + dev_change_rx_flags(dev, IFF_PROMISC); + } + 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. + * Return 0 if successful or a negative errno code on error. + */ +int dev_set_promiscuity(struct net_device *dev, int inc) +{ + unsigned short old_flags = dev->flags; + int err; + + err = __dev_set_promiscuity(dev, inc); + if (err < 0) + return err; + if (dev->flags != old_flags) + dev_set_rx_mode(dev); + return err; +} + +/** + * 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. + * Return 0 if successful or a negative errno code on error. + */ + +int dev_set_allmulti(struct net_device *dev, int inc) +{ + unsigned short old_flags = dev->flags; + + ASSERT_RTNL(); + + dev->flags |= IFF_ALLMULTI; + dev->allmulti += inc; + if (dev->allmulti == 0) { + /* + * Avoid overflow. + * If inc causes overflow, untouch allmulti and return error. + */ + if (inc < 0) + dev->flags &= ~IFF_ALLMULTI; + else { + dev->allmulti -= inc; + printk(KERN_WARNING "%s: allmulti touches roof, " + "set allmulti failed, allmulti feature of " + "device might be broken.\n", dev->name); + return -EOVERFLOW; + } + } + if (dev->flags ^ old_flags) { + dev_change_rx_flags(dev, IFF_ALLMULTI); + dev_set_rx_mode(dev); + } + return 0; +} + +/* + * Upload unicast and multicast address lists to device and + * configure RX filtering. When the device doesn't support unicast + * filtering it is put in promiscuous mode while unicast addresses + * are present. + */ +void __dev_set_rx_mode(struct net_device *dev) +{ + /* dev_open will call this function so the list will stay sane. */ + if (!(dev->flags&IFF_UP)) + return; + + if (!netif_device_present(dev)) + return; + + if (dev->set_rx_mode) + dev->set_rx_mode(dev); + else { + /* Unicast addresses changes may only happen under the rtnl, + * therefore calling __dev_set_promiscuity here is safe. + */ + if (dev->uc_count > 0 && !dev->uc_promisc) { + __dev_set_promiscuity(dev, 1); + dev->uc_promisc = 1; + } else if (dev->uc_count == 0 && dev->uc_promisc) { + __dev_set_promiscuity(dev, -1); + dev->uc_promisc = 0; + } + + if (dev->set_multicast_list) + dev->set_multicast_list(dev); + } +} + +void dev_set_rx_mode(struct net_device *dev) +{ + netif_addr_lock_bh(dev); + __dev_set_rx_mode(dev); + netif_addr_unlock_bh(dev); +} + +int __dev_addr_delete(struct dev_addr_list **list, int *count, + void *addr, int alen, int glbl) +{ + struct dev_addr_list *da; + + for (; (da = *list) != NULL; list = &da->next) { + if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 && + alen == da->da_addrlen) { + if (glbl) { + int old_glbl = da->da_gusers; + da->da_gusers = 0; + if (old_glbl == 0) + break; + } + if (--da->da_users) + return 0; + + *list = da->next; + kfree(da); + (*count)--; + return 0; + } + } + return -ENOENT; +} + +int __dev_addr_add(struct dev_addr_list **list, int *count, + void *addr, int alen, int glbl) +{ + struct dev_addr_list *da; + + for (da = *list; da != NULL; da = da->next) { + if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 && + da->da_addrlen == alen) { + if (glbl) { + int old_glbl = da->da_gusers; + da->da_gusers = 1; + if (old_glbl) + return 0; + } + da->da_users++; + return 0; + } + } + + da = kzalloc(sizeof(*da), GFP_ATOMIC); + if (da == NULL) + return -ENOMEM; + memcpy(da->da_addr, addr, alen); + da->da_addrlen = alen; + da->da_users = 1; + da->da_gusers = glbl ? 1 : 0; + da->next = *list; + *list = da; + (*count)++; + return 0; +} + +/** + * dev_unicast_delete - Release secondary unicast address. + * @dev: device + * @addr: address to delete + * @alen: length of @addr + * + * Release reference to a secondary unicast address and remove it + * from the device if the reference count drops to zero. + * + * The caller must hold the rtnl_mutex. + */ +int dev_unicast_delete(struct net_device *dev, void *addr, int alen) +{ + int err; + + ASSERT_RTNL(); + + netif_addr_lock_bh(dev); + err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0); + if (!err) + __dev_set_rx_mode(dev); + netif_addr_unlock_bh(dev); + return err; +} +EXPORT_SYMBOL(dev_unicast_delete); + +/** + * dev_unicast_add - add a secondary unicast address + * @dev: device + * @addr: address to add + * @alen: length of @addr + * + * Add a secondary unicast address to the device or increase + * the reference count if it already exists. + * + * The caller must hold the rtnl_mutex. + */ +int dev_unicast_add(struct net_device *dev, void *addr, int alen) +{ + int err; + + ASSERT_RTNL(); + + netif_addr_lock_bh(dev); + err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0); + if (!err) + __dev_set_rx_mode(dev); + netif_addr_unlock_bh(dev); + return err; +} +EXPORT_SYMBOL(dev_unicast_add); + +int __dev_addr_sync(struct dev_addr_list **to, int *to_count, + struct dev_addr_list **from, int *from_count) +{ + struct dev_addr_list *da, *next; + int err = 0; + + da = *from; + while (da != NULL) { + next = da->next; + if (!da->da_synced) { + err = __dev_addr_add(to, to_count, + da->da_addr, da->da_addrlen, 0); + if (err < 0) + break; + da->da_synced = 1; + da->da_users++; + } else if (da->da_users == 1) { + __dev_addr_delete(to, to_count, + da->da_addr, da->da_addrlen, 0); + __dev_addr_delete(from, from_count, + da->da_addr, da->da_addrlen, 0); + } + da = next; + } + return err; +} + +void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, + struct dev_addr_list **from, int *from_count) +{ + struct dev_addr_list *da, *next; + + da = *from; + while (da != NULL) { + next = da->next; + if (da->da_synced) { + __dev_addr_delete(to, to_count, + da->da_addr, da->da_addrlen, 0); + da->da_synced = 0; + __dev_addr_delete(from, from_count, + da->da_addr, da->da_addrlen, 0); + } + da = next; + } +} + +/** + * dev_unicast_sync - Synchronize device's unicast list to another device + * @to: destination device + * @from: source device + * + * Add newly added addresses to the destination device and release + * addresses that have no users left. The source device must be + * locked by netif_tx_lock_bh. + * + * This function is intended to be called from the dev->set_rx_mode + * function of layered software devices. + */ +int dev_unicast_sync(struct net_device *to, struct net_device *from) +{ + int err = 0; + + netif_addr_lock_bh(to); + err = __dev_addr_sync(&to->uc_list, &to->uc_count, + &from->uc_list, &from->uc_count); + if (!err) + __dev_set_rx_mode(to); + netif_addr_unlock_bh(to); + return err; +} +EXPORT_SYMBOL(dev_unicast_sync); + +/** + * dev_unicast_unsync - Remove synchronized addresses from the destination device + * @to: destination device + * @from: source device + * + * Remove all addresses that were added to the destination device by + * dev_unicast_sync(). This function is intended to be called from the + * dev->stop function of layered software devices. + */ +void dev_unicast_unsync(struct net_device *to, struct net_device *from) +{ + netif_addr_lock_bh(from); + netif_addr_lock(to); + + __dev_addr_unsync(&to->uc_list, &to->uc_count, + &from->uc_list, &from->uc_count); + __dev_set_rx_mode(to); + + netif_addr_unlock(to); + netif_addr_unlock_bh(from); +} +EXPORT_SYMBOL(dev_unicast_unsync); + +static void __dev_addr_discard(struct dev_addr_list **list) +{ + struct dev_addr_list *tmp; + + while (*list != NULL) { + tmp = *list; + *list = tmp->next; + if (tmp->da_users > tmp->da_gusers) + printk("__dev_addr_discard: address leakage! " + "da_users=%d\n", tmp->da_users); + kfree(tmp); + } +} + +static void dev_addr_discard(struct net_device *dev) +{ + netif_addr_lock_bh(dev); + + __dev_addr_discard(&dev->uc_list); + dev->uc_count = 0; + + __dev_addr_discard(&dev->mc_list); + dev->mc_count = 0; + + netif_addr_unlock_bh(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, changes; + int old_flags = dev->flags; + + ASSERT_RTNL(); + + /* + * 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. + */ + + if ((old_flags ^ flags) & IFF_MULTICAST) + dev_change_rx_flags(dev, IFF_MULTICAST); + + dev_set_rx_mode(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_set_rx_mode(dev); + } + + if (dev->flags & IFF_UP && + ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI | + IFF_VOLATILE))) + call_netdevice_notifiers(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); + } + + /* Exclude state transition flags, already notified */ + changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING); + if (changes) + rtmsg_ifinfo(RTM_NEWLINK, dev, changes); + + 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) + call_netdevice_notifiers(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) + call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); + return err; +} + +/* + * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock) + */ +static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) +{ + int err; + struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); + + if (!dev) + return -ENODEV; + + switch (cmd) { + case SIOCGIFFLAGS: /* Get interface flags */ + ifr->ifr_flags = dev_get_flags(dev); + return 0; + + case SIOCGIFMETRIC: /* Get the metric on the interface + (currently unused) */ + ifr->ifr_metric = 0; + return 0; + + case SIOCGIFMTU: /* Get the MTU of a device */ + ifr->ifr_mtu = dev->mtu; + return 0; + + 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 SIOCGIFSLAVE: + err = -EINVAL; + break; + + 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 SIOCGIFINDEX: + ifr->ifr_ifindex = dev->ifindex; + return 0; + + case SIOCGIFTXQLEN: + ifr->ifr_qlen = dev->tx_queue_len; + return 0; + + default: + /* dev_ioctl() should ensure this case + * is never reached + */ + WARN_ON(1); + err = -EINVAL; + break; + + } + return err; +} + +/* + * Perform the SIOCxIFxxx calls, inside rtnl_lock() + */ +static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) +{ + int err; + struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); + + if (!dev) + return -ENODEV; + + switch (cmd) { + case SIOCSIFFLAGS: /* Set interface flags */ + return dev_change_flags(dev, ifr->ifr_flags); + + case SIOCSIFMETRIC: /* Set the metric on the interface + (currently unused) */ + return -EOPNOTSUPP; + + case SIOCSIFMTU: /* Set the MTU of a device */ + return dev_set_mtu(dev, ifr->ifr_mtu); + + 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)); + call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); + 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 && !dev->set_rx_mode) || + 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 && !dev->set_rx_mode) || + 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 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 + * @net: the applicable net namespace + * @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(struct net *net, 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(net, (char __user *) arg); + rtnl_unlock(); + return ret; + } + if (cmd == SIOCGIFNAME) + return dev_ifname(net, (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(net, ifr.ifr_name); + read_lock(&dev_base_lock); + ret = dev_ifsioc_locked(net, &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(net, ifr.ifr_name); + rtnl_lock(); + ret = dev_ethtool(net, &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(net, ifr.ifr_name); + rtnl_lock(); + ret = dev_ifsioc(net, &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(net, ifr.ifr_name); + rtnl_lock(); + ret = dev_ifsioc(net, &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(net, ifr.ifr_name); + rtnl_lock(); + ret = dev_ifsioc(net, &ifr, cmd); + rtnl_unlock(); + if (!ret && copy_to_user(arg, &ifr, + sizeof(struct ifreq))) + ret = -EFAULT; + return ret; + } + /* Take care of Wireless Extensions */ + if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) + return wext_handle_ioctl(net, &ifr, cmd, arg); + return -EINVAL; + } +} + + +/** + * dev_new_index - allocate an ifindex + * @net: the applicable net namespace + * + * 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(struct net *net) +{ + static int ifindex; + for (;;) { + if (++ifindex <= 0) + ifindex = 1; + if (!__dev_get_by_index(net, ifindex)) + return ifindex; + } +} + +/* Delayed registration/unregisteration */ +static LIST_HEAD(net_todo_list); + +static void net_set_todo(struct net_device *dev) +{ + list_add_tail(&dev->todo_list, &net_todo_list); +} + +static void rollback_registered(struct net_device *dev) +{ + 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); + + WARN_ON(1); + return; + } + + BUG_ON(dev->reg_state != NETREG_REGISTERED); + + /* If device is running, close it first. */ + dev_close(dev); + + /* And unlink it from device chain. */ + unlist_netdevice(dev); + + 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. + */ + call_netdevice_notifiers(NETDEV_UNREGISTER, dev); + + /* + * Flush the unicast and multicast chains + */ + dev_addr_discard(dev); + + if (dev->uninit) + dev->uninit(dev); + + /* Notifier chain MUST detach us from master device. */ + WARN_ON(dev->master); + + /* Remove entries from kobject tree */ + netdev_unregister_kobject(dev); + + synchronize_net(); + + dev_put(dev); +} + +static void __netdev_init_queue_locks_one(struct net_device *dev, + struct netdev_queue *dev_queue, + void *_unused) +{ + spin_lock_init(&dev_queue->_xmit_lock); + netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type); + dev_queue->xmit_lock_owner = -1; +} + +static void netdev_init_queue_locks(struct net_device *dev) +{ + netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL); + __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL); +} + +/** + * 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; + struct net *net; + + 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); + BUG_ON(!dev_net(dev)); + net = dev_net(dev); + + spin_lock_init(&dev->addr_list_lock); + netdev_set_addr_lockdep_class(dev); + netdev_init_queue_locks(dev); + + 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; + } + } + + if (!dev_valid_name(dev->name)) { + ret = -EINVAL; + goto err_uninit; + } + + dev->ifindex = dev_new_index(net); + if (dev->iflink == -1) + dev->iflink = dev->ifindex; + + /* Check for existence of name */ + head = dev_name_hash(net, 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 err_uninit; + } + } + + /* Fix illegal checksum combinations */ + if ((dev->features & NETIF_F_HW_CSUM) && + (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { + printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n", + dev->name); + dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); + } + + if ((dev->features & NETIF_F_NO_CSUM) && + (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { + printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n", + dev->name); + dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM); + } + + + /* Fix illegal SG+CSUM combinations. */ + if ((dev->features & NETIF_F_SG) && + !(dev->features & NETIF_F_ALL_CSUM)) { + printk(KERN_NOTICE "%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(KERN_NOTICE "%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_GEN_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; + } + } + + /* Enable software GSO if SG is supported. */ + if (dev->features & NETIF_F_SG) + dev->features |= NETIF_F_GSO; + + netdev_initialize_kobject(dev); + ret = netdev_register_kobject(dev); + if (ret) + goto err_uninit; + dev->reg_state = NETREG_REGISTERED; + + /* + * Default initial state at registry is that the + * device is present. + */ + + set_bit(__LINK_STATE_PRESENT, &dev->state); + + dev_init_scheduler(dev); + dev_hold(dev); + list_netdevice(dev); + + /* Notify protocols, that a new device appeared. */ + ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); + ret = notifier_to_errno(ret); + if (ret) { + rollback_registered(dev); + dev->reg_state = NETREG_UNREGISTERED; + } + +out: + return ret; + +err_uninit: + if (dev->uninit) + dev->uninit(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_netdevice 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; + } + + 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 */ + call_netdevice_notifiers(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(). + * 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. + * + * We must not return until all unregister events added during + * the interval the lock was held have been completed. + */ +void netdev_run_todo(void) +{ + struct list_head list; + + /* Snapshot list, allow later requests */ + list_replace_init(&net_todo_list, &list); + + __rtnl_unlock(); + + 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; + } + + dev->reg_state = NETREG_UNREGISTERED; + + on_each_cpu(flush_backlog, dev, 1); + + netdev_wait_allrefs(dev); + + /* paranoia */ + BUG_ON(atomic_read(&dev->refcnt)); + WARN_ON(dev->ip_ptr); + WARN_ON(dev->ip6_ptr); + WARN_ON(dev->dn_ptr); + + if (dev->destructor) + dev->destructor(dev); + + /* Free network device */ + kobject_put(&dev->dev.kobj); + } +} + +static struct net_device_stats *internal_stats(struct net_device *dev) +{ + return &dev->stats; +} + +static void netdev_init_one_queue(struct net_device *dev, + struct netdev_queue *queue, + void *_unused) +{ + queue->dev = dev; +} + +static void netdev_init_queues(struct net_device *dev) +{ + netdev_init_one_queue(dev, &dev->rx_queue, NULL); + netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); + spin_lock_init(&dev->tx_global_lock); +} + +/** + * alloc_netdev_mq - allocate network device + * @sizeof_priv: size of private data to allocate space for + * @name: device name format string + * @setup: callback to initialize device + * @queue_count: the number of subqueues to allocate + * + * Allocates a struct net_device with private data area for driver use + * and performs basic initialization. Also allocates subquue structs + * for each queue on the device at the end of the netdevice. + */ +struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, + void (*setup)(struct net_device *), unsigned int queue_count) +{ + struct netdev_queue *tx; + struct net_device *dev; + size_t alloc_size; + void *p; + + BUG_ON(strlen(name) >= sizeof(dev->name)); + + alloc_size = sizeof(struct net_device); + if (sizeof_priv) { + /* ensure 32-byte alignment of private area */ + alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST; + alloc_size += sizeof_priv; + } + /* ensure 32-byte alignment of whole construct */ + alloc_size += NETDEV_ALIGN_CONST; + + p = kzalloc(alloc_size, GFP_KERNEL); + if (!p) { + printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n"); + return NULL; + } + + tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL); + if (!tx) { + printk(KERN_ERR "alloc_netdev: Unable to allocate " + "tx qdiscs.\n"); + kfree(p); + return NULL; + } + + dev = (struct net_device *) + (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); + dev->padded = (char *)dev - (char *)p; + dev_net_set(dev, &init_net); + + dev->_tx = tx; + dev->num_tx_queues = queue_count; + dev->real_num_tx_queues = queue_count; + + if (sizeof_priv) { + dev->priv = ((char *)dev + + ((sizeof(struct net_device) + NETDEV_ALIGN_CONST) + & ~NETDEV_ALIGN_CONST)); + } + + dev->gso_max_size = GSO_MAX_SIZE; + + netdev_init_queues(dev); + + dev->get_stats = internal_stats; + netpoll_netdev_init(dev); + setup(dev); + strcpy(dev->name, name); + return dev; +} +EXPORT_SYMBOL(alloc_netdev_mq); + +/** + * 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) +{ + release_net(dev_net(dev)); + + kfree(dev->_tx); + + /* 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 device release */ + put_device(&dev->dev); +} + +/* 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. + * + * Callers must hold the rtnl semaphore. You may want + * unregister_netdev() instead of this. + */ + +void unregister_netdevice(struct net_device *dev) +{ + ASSERT_RTNL(); + + rollback_registered(dev); + /* Finish processing unregister after unlock */ + net_set_todo(dev); +} + +/** + * unregister_netdev - remove device from the kernel + * @dev: device + * + * This function shuts down a device interface and removes it + * from the kernel tables. + * + * 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); + +/** + * dev_change_net_namespace - move device to different nethost namespace + * @dev: device + * @net: network namespace + * @pat: If not NULL name pattern to try if the current device name + * is already taken in the destination network namespace. + * + * This function shuts down a device interface and moves it + * to a new network namespace. On success 0 is returned, on + * a failure a netagive errno code is returned. + * + * Callers must hold the rtnl semaphore. + */ + +int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) +{ + char buf[IFNAMSIZ]; + const char *destname; + int err; + + ASSERT_RTNL(); + + /* Don't allow namespace local devices to be moved. */ + err = -EINVAL; + if (dev->features & NETIF_F_NETNS_LOCAL) + goto out; + +#ifdef CONFIG_SYSFS + /* Don't allow real devices to be moved when sysfs + * is enabled. + */ + err = -EINVAL; + if (dev->dev.parent) + goto out; +#endif + + /* Ensure the device has been registrered */ + err = -EINVAL; + if (dev->reg_state != NETREG_REGISTERED) + goto out; + + /* Get out if there is nothing todo */ + err = 0; + if (net_eq(dev_net(dev), net)) + goto out; + + /* Pick the destination device name, and ensure + * we can use it in the destination network namespace. + */ + err = -EEXIST; + destname = dev->name; + if (__dev_get_by_name(net, destname)) { + /* We get here if we can't use the current device name */ + if (!pat) + goto out; + if (!dev_valid_name(pat)) + goto out; + if (strchr(pat, '%')) { + if (__dev_alloc_name(net, pat, buf) < 0) + goto out; + destname = buf; + } else + destname = pat; + if (__dev_get_by_name(net, destname)) + goto out; + } + + /* + * And now a mini version of register_netdevice unregister_netdevice. + */ + + /* If device is running close it first. */ + dev_close(dev); + + /* And unlink it from device chain */ + err = -ENODEV; + unlist_netdevice(dev); + + synchronize_net(); + + /* Shutdown queueing discipline. */ + dev_shutdown(dev); + + /* Notify protocols, that we are about to destroy + this device. They should clean all the things. + */ + call_netdevice_notifiers(NETDEV_UNREGISTER, dev); + + /* + * Flush the unicast and multicast chains + */ + dev_addr_discard(dev); + + netdev_unregister_kobject(dev); + + /* Actually switch the network namespace */ + dev_net_set(dev, net); + + /* Assign the new device name */ + if (destname != dev->name) + strcpy(dev->name, destname); + + /* If there is an ifindex conflict assign a new one */ + if (__dev_get_by_index(net, dev->ifindex)) { + int iflink = (dev->iflink == dev->ifindex); + dev->ifindex = dev_new_index(net); + if (iflink) + dev->iflink = dev->ifindex; + } + + /* Fixup kobjects */ + err = netdev_register_kobject(dev); + WARN_ON(err); + + /* Add the device back in the hashes */ + list_netdevice(dev); + + /* Notify protocols, that a new device appeared. */ + call_netdevice_notifiers(NETDEV_REGISTER, dev); + + synchronize_net(); + err = 0; +out: + return err; +} + +static int dev_cpu_callback(struct notifier_block *nfb, + unsigned long action, + void *ocpu) +{ + struct sk_buff **list_skb; + struct Qdisc **list_net; + struct sk_buff *skb; + unsigned int cpu, oldcpu = (unsigned long)ocpu; + struct softnet_data *sd, *oldsd; + + if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) + 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; +} + +#ifdef CONFIG_NET_DMA +/** + * net_dma_rebalance - try to maintain one DMA channel per CPU + * @net_dma: DMA client and associated data (lock, channels, channel_mask) + * + * 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(struct net_dma *net_dma) +{ + unsigned int cpu, i, n, chan_idx; + struct dma_chan *chan; + + if (cpus_empty(net_dma->channel_mask)) { + for_each_online_cpu(cpu) + rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL); + return; + } + + i = 0; + cpu = first_cpu(cpu_online_map); + + for_each_cpu_mask_nr(chan_idx, net_dma->channel_mask) { + chan = net_dma->channels[chan_idx]; + + n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask)) + + (i < (num_online_cpus() % + cpus_weight(net_dma->channel_mask)) ? 1 : 0)); + + while(n) { + per_cpu(softnet_data, cpu).net_dma = chan; + cpu = next_cpu(cpu, cpu_online_map); + n--; + } + i++; + } +} + +/** + * netdev_dma_event - event callback for the net_dma_client + * @client: should always be net_dma_client + * @chan: DMA channel for the event + * @state: DMA state to be handled + */ +static enum dma_state_client +netdev_dma_event(struct dma_client *client, struct dma_chan *chan, + enum dma_state state) +{ + int i, found = 0, pos = -1; + struct net_dma *net_dma = + container_of(client, struct net_dma, client); + enum dma_state_client ack = DMA_DUP; /* default: take no action */ + + spin_lock(&net_dma->lock); + switch (state) { + case DMA_RESOURCE_AVAILABLE: + for (i = 0; i < nr_cpu_ids; i++) + if (net_dma->channels[i] == chan) { + found = 1; + break; + } else if (net_dma->channels[i] == NULL && pos < 0) + pos = i; + + if (!found && pos >= 0) { + ack = DMA_ACK; + net_dma->channels[pos] = chan; + cpu_set(pos, net_dma->channel_mask); + net_dma_rebalance(net_dma); + } + break; + case DMA_RESOURCE_REMOVED: + for (i = 0; i < nr_cpu_ids; i++) + if (net_dma->channels[i] == chan) { + found = 1; + pos = i; + break; + } + + if (found) { + ack = DMA_ACK; + cpu_clear(pos, net_dma->channel_mask); + net_dma->channels[i] = NULL; + net_dma_rebalance(net_dma); + } + break; + default: + break; + } + spin_unlock(&net_dma->lock); + + return ack; +} + +/** + * netdev_dma_regiser - register the networking subsystem as a DMA client + */ +static int __init netdev_dma_register(void) +{ + net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma), + GFP_KERNEL); + if (unlikely(!net_dma.channels)) { + printk(KERN_NOTICE + "netdev_dma: no memory for net_dma.channels\n"); + return -ENOMEM; + } + spin_lock_init(&net_dma.lock); + dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask); + dma_async_client_register(&net_dma.client); + dma_async_client_chan_request(&net_dma.client); + return 0; +} + +#else +static int __init netdev_dma_register(void) { return -ENODEV; } +#endif /* CONFIG_NET_DMA */ + +/** + * netdev_compute_feature - compute conjunction of two feature sets + * @all: first feature set + * @one: second feature set + * + * Computes a new feature set after adding a device with feature set + * @one to the master device with current feature set @all. Returns + * the new feature set. + */ +int netdev_compute_features(unsigned long all, unsigned long one) +{ + /* if device needs checksumming, downgrade to hw checksumming */ + if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM)) + all ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM; + + /* if device can't do all checksum, downgrade to ipv4/ipv6 */ + if (all & NETIF_F_HW_CSUM && !(one & NETIF_F_HW_CSUM)) + all ^= NETIF_F_HW_CSUM + | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; + + if (one & NETIF_F_GSO) + one |= NETIF_F_GSO_SOFTWARE; + one |= NETIF_F_GSO; + + /* If even one device supports robust GSO, enable it for all. */ + if (one & NETIF_F_GSO_ROBUST) + all |= NETIF_F_GSO_ROBUST; + + all &= one | NETIF_F_LLTX; + + if (!(all & NETIF_F_ALL_CSUM)) + all &= ~NETIF_F_SG; + if (!(all & NETIF_F_SG)) + all &= ~NETIF_F_GSO_MASK; + + return all; +} +EXPORT_SYMBOL(netdev_compute_features); + +static struct hlist_head *netdev_create_hash(void) +{ + int i; + struct hlist_head *hash; + + hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); + if (hash != NULL) + for (i = 0; i < NETDEV_HASHENTRIES; i++) + INIT_HLIST_HEAD(&hash[i]); + + return hash; +} + +/* Initialize per network namespace state */ +static int __net_init netdev_init(struct net *net) +{ + INIT_LIST_HEAD(&net->dev_base_head); + + net->dev_name_head = netdev_create_hash(); + if (net->dev_name_head == NULL) + goto err_name; + + net->dev_index_head = netdev_create_hash(); + if (net->dev_index_head == NULL) + goto err_idx; + + return 0; + +err_idx: + kfree(net->dev_name_head); +err_name: + return -ENOMEM; +} + +char *netdev_drivername(struct net_device *dev, char *buffer, int len) +{ + struct device_driver *driver; + struct device *parent; + + if (len <= 0 || !buffer) + return buffer; + buffer[0] = 0; + + parent = dev->dev.parent; + + if (!parent) + return buffer; + + driver = parent->driver; + if (driver && driver->name) + strlcpy(buffer, driver->name, len); + return buffer; +} + +static void __net_exit netdev_exit(struct net *net) +{ + kfree(net->dev_name_head); + kfree(net->dev_index_head); +} + +static struct pernet_operations __net_initdata netdev_net_ops = { + .init = netdev_init, + .exit = netdev_exit, +}; + +static void __net_exit default_device_exit(struct net *net) +{ + struct net_device *dev, *next; + /* + * Push all migratable of the network devices back to the + * initial network namespace + */ + rtnl_lock(); + for_each_netdev_safe(net, dev, next) { + int err; + char fb_name[IFNAMSIZ]; + + /* Ignore unmoveable devices (i.e. loopback) */ + if (dev->features & NETIF_F_NETNS_LOCAL) + continue; + + /* Push remaing network devices to init_net */ + snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); + err = dev_change_net_namespace(dev, &init_net, fb_name); + if (err) { + printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n", + __func__, dev->name, err); + BUG(); + } + } + rtnl_unlock(); +} + +static struct pernet_operations __net_initdata default_device_ops = { + .exit = default_device_exit, +}; + +/* + * 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); + + if (dev_proc_init()) + goto out; + + if (netdev_kobject_init()) + goto out; + + INIT_LIST_HEAD(&ptype_all); + for (i = 0; i < PTYPE_HASH_SIZE; i++) + INIT_LIST_HEAD(&ptype_base[i]); + + if (register_pernet_subsys(&netdev_net_ops)) + goto out; + + if (register_pernet_device(&default_device_ops)) + goto out; + + /* + * 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); + + queue->backlog.poll = process_backlog; + queue->backlog.weight = weight_p; + } + + netdev_dma_register(); + + dev_boot_phase = 0; + + open_softirq(NET_TX_SOFTIRQ, net_tx_action); + open_softirq(NET_RX_SOFTIRQ, net_rx_action); + + hotcpu_notifier(dev_cpu_callback, 0); + dst_init(); + dev_mcast_init(); + rc = 0; +out: + return rc; +} + +subsys_initcall(net_dev_init); + +EXPORT_SYMBOL(__dev_get_by_index); +EXPORT_SYMBOL(__dev_get_by_name); +EXPORT_SYMBOL(__dev_remove_pack); +EXPORT_SYMBOL(dev_valid_name); +EXPORT_SYMBOL(dev_add_pack); +EXPORT_SYMBOL(dev_alloc_name); +EXPORT_SYMBOL(dev_close); +EXPORT_SYMBOL(dev_get_by_flags); +EXPORT_SYMBOL(dev_get_by_index); +EXPORT_SYMBOL(dev_get_by_name); +EXPORT_SYMBOL(dev_open); +EXPORT_SYMBOL(dev_ioctl); +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_receive_skb); +EXPORT_SYMBOL(netif_rx); +EXPORT_SYMBOL(register_gifconf); +EXPORT_SYMBOL(register_netdevice); +EXPORT_SYMBOL(register_netdevice_notifier); + +/* Click */ +EXPORT_SYMBOL(register_net_in); +EXPORT_SYMBOL(unregister_net_in); + +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);