1 /* 2 * net/l3mdev/l3mdev.c - L3 master device implementation 3 * Copyright (c) 2015 Cumulus Networks 4 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/netdevice.h> 13 #include <net/l3mdev.h> 14 15 /** 16 * l3mdev_master_ifindex - get index of L3 master device 17 * @dev: targeted interface 18 */ 19 20 int l3mdev_master_ifindex_rcu(struct net_device *dev) 21 { 22 int ifindex = 0; 23 24 if (!dev) 25 return 0; 26 27 if (netif_is_l3_master(dev)) { 28 ifindex = dev->ifindex; 29 } else if (netif_is_l3_slave(dev)) { 30 struct net_device *master; 31 32 master = netdev_master_upper_dev_get_rcu(dev); 33 if (master) 34 ifindex = master->ifindex; 35 } 36 37 return ifindex; 38 } 39 EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu); 40 41 /** 42 * l3mdev_fib_table - get FIB table id associated with an L3 43 * master interface 44 * @dev: targeted interface 45 */ 46 47 u32 l3mdev_fib_table_rcu(const struct net_device *dev) 48 { 49 u32 tb_id = 0; 50 51 if (!dev) 52 return 0; 53 54 if (netif_is_l3_master(dev)) { 55 if (dev->l3mdev_ops->l3mdev_fib_table) 56 tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev); 57 } else if (netif_is_l3_slave(dev)) { 58 /* Users of netdev_master_upper_dev_get_rcu need non-const, 59 * but current inet_*type functions take a const 60 */ 61 struct net_device *_dev = (struct net_device *) dev; 62 const struct net_device *master; 63 64 master = netdev_master_upper_dev_get_rcu(_dev); 65 if (master && 66 master->l3mdev_ops->l3mdev_fib_table) 67 tb_id = master->l3mdev_ops->l3mdev_fib_table(master); 68 } 69 70 return tb_id; 71 } 72 EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu); 73 74 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) 75 { 76 struct net_device *dev; 77 u32 tb_id = 0; 78 79 if (!ifindex) 80 return 0; 81 82 rcu_read_lock(); 83 84 dev = dev_get_by_index_rcu(net, ifindex); 85 if (dev) 86 tb_id = l3mdev_fib_table_rcu(dev); 87 88 rcu_read_unlock(); 89 90 return tb_id; 91 } 92 EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index); 93