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net/core/dev_addr_lists.c
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/* * net/core/dev_addr_lists.c - Functions for handling net device lists * Copyright (c) 2010 Jiri Pirko <jpirko@redhat.com> * * This file contains functions for working with unicast, multicast and device * addresses lists. * * 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. */ #include <linux/netdevice.h> #include <linux/rtnetlink.h> |
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#include <linux/export.h> |
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#include <linux/list.h> |
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#include <linux/proc_fs.h> |
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/* * General list handling functions */ |
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static int __hw_addr_add_ex(struct netdev_hw_addr_list *list, unsigned char *addr, int addr_len, unsigned char addr_type, bool global) |
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{ struct netdev_hw_addr *ha; int alloc_size; if (addr_len > MAX_ADDR_LEN) return -EINVAL; list_for_each_entry(ha, &list->list, list) { if (!memcmp(ha->addr, addr, addr_len) && ha->type == addr_type) { |
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if (global) { /* check if addr is already used as global */ if (ha->global_use) return 0; else ha->global_use = true; } |
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ha->refcount++; return 0; } } alloc_size = sizeof(*ha); if (alloc_size < L1_CACHE_BYTES) alloc_size = L1_CACHE_BYTES; ha = kmalloc(alloc_size, GFP_ATOMIC); if (!ha) return -ENOMEM; memcpy(ha->addr, addr, addr_len); ha->type = addr_type; ha->refcount = 1; |
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ha->global_use = global; |
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ha->synced = false; list_add_tail_rcu(&ha->list, &list->list); list->count++; return 0; } |
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static int __hw_addr_add(struct netdev_hw_addr_list *list, unsigned char *addr, int addr_len, unsigned char addr_type) { return __hw_addr_add_ex(list, addr, addr_len, addr_type, false); } |
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static int __hw_addr_del_ex(struct netdev_hw_addr_list *list, unsigned char *addr, int addr_len, unsigned char addr_type, bool global) |
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{ struct netdev_hw_addr *ha; list_for_each_entry(ha, &list->list, list) { if (!memcmp(ha->addr, addr, addr_len) && (ha->type == addr_type || !addr_type)) { |
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if (global) { if (!ha->global_use) break; else ha->global_use = false; } |
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if (--ha->refcount) return 0; list_del_rcu(&ha->list); |
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kfree_rcu(ha, rcu_head); |
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list->count--; return 0; } } return -ENOENT; } |
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static int __hw_addr_del(struct netdev_hw_addr_list *list, unsigned char *addr, int addr_len, unsigned char addr_type) { return __hw_addr_del_ex(list, addr, addr_len, addr_type, false); } int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list, struct netdev_hw_addr_list *from_list, int addr_len, unsigned char addr_type) |
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{ int err; struct netdev_hw_addr *ha, *ha2; unsigned char type; list_for_each_entry(ha, &from_list->list, list) { type = addr_type ? addr_type : ha->type; err = __hw_addr_add(to_list, ha->addr, addr_len, type); if (err) goto unroll; } return 0; unroll: list_for_each_entry(ha2, &from_list->list, list) { if (ha2 == ha) break; type = addr_type ? addr_type : ha2->type; __hw_addr_del(to_list, ha2->addr, addr_len, type); } return err; } |
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EXPORT_SYMBOL(__hw_addr_add_multiple); |
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void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list, struct netdev_hw_addr_list *from_list, int addr_len, unsigned char addr_type) |
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{ struct netdev_hw_addr *ha; unsigned char type; list_for_each_entry(ha, &from_list->list, list) { type = addr_type ? addr_type : ha->type; |
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__hw_addr_del(to_list, ha->addr, addr_len, type); |
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} } |
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EXPORT_SYMBOL(__hw_addr_del_multiple); |
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|
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int __hw_addr_sync(struct netdev_hw_addr_list *to_list, struct netdev_hw_addr_list *from_list, int addr_len) |
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{ int err = 0; struct netdev_hw_addr *ha, *tmp; list_for_each_entry_safe(ha, tmp, &from_list->list, list) { if (!ha->synced) { err = __hw_addr_add(to_list, ha->addr, addr_len, ha->type); if (err) break; ha->synced = true; ha->refcount++; } else if (ha->refcount == 1) { __hw_addr_del(to_list, ha->addr, addr_len, ha->type); __hw_addr_del(from_list, ha->addr, addr_len, ha->type); } } return err; } |
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EXPORT_SYMBOL(__hw_addr_sync); |
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|
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void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, struct netdev_hw_addr_list *from_list, int addr_len) |
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{ struct netdev_hw_addr *ha, *tmp; list_for_each_entry_safe(ha, tmp, &from_list->list, list) { if (ha->synced) { __hw_addr_del(to_list, ha->addr, addr_len, ha->type); ha->synced = false; __hw_addr_del(from_list, ha->addr, addr_len, ha->type); } } } |
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EXPORT_SYMBOL(__hw_addr_unsync); |
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void __hw_addr_flush(struct netdev_hw_addr_list *list) |
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{ struct netdev_hw_addr *ha, *tmp; list_for_each_entry_safe(ha, tmp, &list->list, list) { list_del_rcu(&ha->list); |
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kfree_rcu(ha, rcu_head); |
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} list->count = 0; } |
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EXPORT_SYMBOL(__hw_addr_flush); |
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|
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void __hw_addr_init(struct netdev_hw_addr_list *list) |
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{ INIT_LIST_HEAD(&list->list); list->count = 0; } |
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EXPORT_SYMBOL(__hw_addr_init); |
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/* * Device addresses handling functions */ /** * dev_addr_flush - Flush device address list * @dev: device * * Flush device address list and reset ->dev_addr. * * The caller must hold the rtnl_mutex. */ void dev_addr_flush(struct net_device *dev) { /* rtnl_mutex must be held here */ __hw_addr_flush(&dev->dev_addrs); dev->dev_addr = NULL; } EXPORT_SYMBOL(dev_addr_flush); /** * dev_addr_init - Init device address list * @dev: device * * Init device address list and create the first element, * used by ->dev_addr. * * The caller must hold the rtnl_mutex. */ int dev_addr_init(struct net_device *dev) { unsigned char addr[MAX_ADDR_LEN]; struct netdev_hw_addr *ha; int err; /* rtnl_mutex must be held here */ __hw_addr_init(&dev->dev_addrs); memset(addr, 0, sizeof(addr)); err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr), NETDEV_HW_ADDR_T_LAN); if (!err) { /* * Get the first (previously created) address from the list * and set dev_addr pointer to this location. */ ha = list_first_entry(&dev->dev_addrs.list, struct netdev_hw_addr, list); dev->dev_addr = ha->addr; } return err; } EXPORT_SYMBOL(dev_addr_init); /** * dev_addr_add - Add a device address * @dev: device * @addr: address to add * @addr_type: address type * * Add a device address to the device or increase the reference count if * it already exists. * * The caller must hold the rtnl_mutex. */ int dev_addr_add(struct net_device *dev, unsigned char *addr, unsigned char addr_type) { int err; ASSERT_RTNL(); err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type); if (!err) call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); return err; } EXPORT_SYMBOL(dev_addr_add); /** * dev_addr_del - Release a device address. * @dev: device * @addr: address to delete * @addr_type: address type * * Release reference to a device address and remove it from the device * if the reference count drops to zero. * * The caller must hold the rtnl_mutex. */ int dev_addr_del(struct net_device *dev, unsigned char *addr, unsigned char addr_type) { int err; struct netdev_hw_addr *ha; ASSERT_RTNL(); /* * We can not remove the first address from the list because * dev->dev_addr points to that. */ ha = list_first_entry(&dev->dev_addrs.list, struct netdev_hw_addr, list); if (ha->addr == dev->dev_addr && ha->refcount == 1) return -ENOENT; err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len, addr_type); if (!err) call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); return err; } EXPORT_SYMBOL(dev_addr_del); /** * dev_addr_add_multiple - Add device addresses from another device * @to_dev: device to which addresses will be added * @from_dev: device from which addresses will be added * @addr_type: address type - 0 means type will be used from from_dev * * Add device addresses of the one device to another. ** * The caller must hold the rtnl_mutex. */ int dev_addr_add_multiple(struct net_device *to_dev, struct net_device *from_dev, unsigned char addr_type) { int err; ASSERT_RTNL(); if (from_dev->addr_len != to_dev->addr_len) return -EINVAL; err = __hw_addr_add_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, to_dev->addr_len, addr_type); if (!err) call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); return err; } EXPORT_SYMBOL(dev_addr_add_multiple); /** * dev_addr_del_multiple - Delete device addresses by another device * @to_dev: device where the addresses will be deleted |
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* @from_dev: device supplying the addresses to be deleted * @addr_type: address type - 0 means type will be used from from_dev |
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* * Deletes addresses in to device by the list of addresses in from device. * * The caller must hold the rtnl_mutex. */ int dev_addr_del_multiple(struct net_device *to_dev, struct net_device *from_dev, unsigned char addr_type) { ASSERT_RTNL(); if (from_dev->addr_len != to_dev->addr_len) return -EINVAL; __hw_addr_del_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, to_dev->addr_len, addr_type); call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); return 0; } EXPORT_SYMBOL(dev_addr_del_multiple); /* * Unicast list handling functions */ /** * dev_uc_add - Add a secondary unicast address * @dev: device * @addr: address to add * * Add a secondary unicast address to the device or increase * the reference count if it already exists. */ int dev_uc_add(struct net_device *dev, unsigned char *addr) { int err; netif_addr_lock_bh(dev); err = __hw_addr_add(&dev->uc, addr, dev->addr_len, NETDEV_HW_ADDR_T_UNICAST); if (!err) __dev_set_rx_mode(dev); netif_addr_unlock_bh(dev); return err; } EXPORT_SYMBOL(dev_uc_add); /** * dev_uc_del - Release secondary unicast address. * @dev: device * @addr: address to delete * * Release reference to a secondary unicast address and remove it * from the device if the reference count drops to zero. */ int dev_uc_del(struct net_device *dev, unsigned char *addr) { int err; netif_addr_lock_bh(dev); err = __hw_addr_del(&dev->uc, addr, dev->addr_len, NETDEV_HW_ADDR_T_UNICAST); if (!err) __dev_set_rx_mode(dev); netif_addr_unlock_bh(dev); return err; } EXPORT_SYMBOL(dev_uc_del); /** * dev_uc_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 |
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* locked by netif_addr_lock_bh. |
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* * This function is intended to be called from the dev->set_rx_mode * function of layered software devices. */ int dev_uc_sync(struct net_device *to, struct net_device *from) { int err = 0; if (to->addr_len != from->addr_len) return -EINVAL; |
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netif_addr_lock_nested(to); |
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err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len); if (!err) __dev_set_rx_mode(to); |
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netif_addr_unlock(to); |
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return err; } EXPORT_SYMBOL(dev_uc_sync); /** * dev_uc_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_uc_sync(). This function is intended to be called from the * dev->stop function of layered software devices. */ void dev_uc_unsync(struct net_device *to, struct net_device *from) { if (to->addr_len != from->addr_len) return; netif_addr_lock_bh(from); |
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netif_addr_lock_nested(to); |
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__hw_addr_unsync(&to->uc, &from->uc, to->addr_len); __dev_set_rx_mode(to); netif_addr_unlock(to); netif_addr_unlock_bh(from); } EXPORT_SYMBOL(dev_uc_unsync); /** * dev_uc_flush - Flush unicast addresses * @dev: device * * Flush unicast addresses. */ void dev_uc_flush(struct net_device *dev) { netif_addr_lock_bh(dev); __hw_addr_flush(&dev->uc); netif_addr_unlock_bh(dev); } EXPORT_SYMBOL(dev_uc_flush); /** * dev_uc_flush - Init unicast address list * @dev: device * * Init unicast address list. */ void dev_uc_init(struct net_device *dev) { __hw_addr_init(&dev->uc); } EXPORT_SYMBOL(dev_uc_init); /* * Multicast list handling functions */ |
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static int __dev_mc_add(struct net_device *dev, unsigned char *addr, bool global) { int err; netif_addr_lock_bh(dev); err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST, global); if (!err) __dev_set_rx_mode(dev); netif_addr_unlock_bh(dev); return err; } /** * dev_mc_add - Add a multicast address * @dev: device * @addr: address to add * * Add a multicast address to the device or increase * the reference count if it already exists. */ int dev_mc_add(struct net_device *dev, unsigned char *addr) { return __dev_mc_add(dev, addr, false); } EXPORT_SYMBOL(dev_mc_add); /** * dev_mc_add_global - Add a global multicast address * @dev: device * @addr: address to add * * Add a global multicast address to the device. */ int dev_mc_add_global(struct net_device *dev, unsigned char *addr) { return __dev_mc_add(dev, addr, true); } EXPORT_SYMBOL(dev_mc_add_global); static int __dev_mc_del(struct net_device *dev, unsigned char *addr, bool global) { int err; netif_addr_lock_bh(dev); err = __hw_addr_del_ex(&dev->mc, addr, dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST, global); if (!err) __dev_set_rx_mode(dev); netif_addr_unlock_bh(dev); return err; } /** * dev_mc_del - Delete a multicast address. * @dev: device * @addr: address to delete * * Release reference to a multicast address and remove it * from the device if the reference count drops to zero. */ int dev_mc_del(struct net_device *dev, unsigned char *addr) { return __dev_mc_del(dev, addr, false); } EXPORT_SYMBOL(dev_mc_del); /** * dev_mc_del_global - Delete a global multicast address. * @dev: device * @addr: address to delete * * Release reference to a multicast address and remove it * from the device if the reference count drops to zero. */ int dev_mc_del_global(struct net_device *dev, unsigned char *addr) { return __dev_mc_del(dev, addr, true); } EXPORT_SYMBOL(dev_mc_del_global); /** * dev_mc_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 |
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* locked by netif_addr_lock_bh. |
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* |
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* This function is intended to be called from the ndo_set_rx_mode * function of layered software devices. |
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*/ int dev_mc_sync(struct net_device *to, struct net_device *from) { int err = 0; if (to->addr_len != from->addr_len) return -EINVAL; |
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netif_addr_lock_nested(to); |
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err = __hw_addr_sync(&to->mc, &from->mc, to->addr_len); if (!err) __dev_set_rx_mode(to); |
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netif_addr_unlock(to); |
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return err; } EXPORT_SYMBOL(dev_mc_sync); /** * dev_mc_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_mc_sync(). This function is intended to be called from the * dev->stop function of layered software devices. */ void dev_mc_unsync(struct net_device *to, struct net_device *from) { if (to->addr_len != from->addr_len) return; netif_addr_lock_bh(from); |
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netif_addr_lock_nested(to); |
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__hw_addr_unsync(&to->mc, &from->mc, to->addr_len); __dev_set_rx_mode(to); netif_addr_unlock(to); netif_addr_unlock_bh(from); } EXPORT_SYMBOL(dev_mc_unsync); /** * dev_mc_flush - Flush multicast addresses * @dev: device * * Flush multicast addresses. */ void dev_mc_flush(struct net_device *dev) { netif_addr_lock_bh(dev); __hw_addr_flush(&dev->mc); netif_addr_unlock_bh(dev); } EXPORT_SYMBOL(dev_mc_flush); /** * dev_mc_flush - Init multicast address list * @dev: device * * Init multicast address list. */ void dev_mc_init(struct net_device *dev) { __hw_addr_init(&dev->mc); } EXPORT_SYMBOL(dev_mc_init); #ifdef CONFIG_PROC_FS |
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#include <linux/seq_file.h> static int dev_mc_seq_show(struct seq_file *seq, void *v) { struct netdev_hw_addr *ha; struct net_device *dev = v; if (v == SEQ_START_TOKEN) return 0; netif_addr_lock_bh(dev); netdev_for_each_mc_addr(ha, dev) { int i; seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex, dev->name, ha->refcount, ha->global_use); for (i = 0; i < dev->addr_len; i++) seq_printf(seq, "%02x", ha->addr[i]); seq_putc(seq, ' '); } netif_addr_unlock_bh(dev); return 0; } static const struct seq_operations dev_mc_seq_ops = { .start = dev_seq_start, .next = dev_seq_next, .stop = dev_seq_stop, .show = dev_mc_seq_show, }; static int dev_mc_seq_open(struct inode *inode, struct file *file) { |
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return dev_seq_open_ops(inode, file, &dev_mc_seq_ops); |
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} static const struct file_operations dev_mc_seq_fops = { .owner = THIS_MODULE, .open = dev_mc_seq_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_net, }; #endif static int __net_init dev_mc_net_init(struct net *net) { if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops)) return -ENOMEM; return 0; } static void __net_exit dev_mc_net_exit(struct net *net) { proc_net_remove(net, "dev_mcast"); } static struct pernet_operations __net_initdata dev_mc_net_ops = { .init = dev_mc_net_init, .exit = dev_mc_net_exit, }; void __init dev_mcast_init(void) { register_pernet_subsys(&dev_mc_net_ops); } |