2 * net/l3mdev/l3mdev.c - L3 master device implementation
3 * Copyright (c) 2015 Cumulus Networks
4 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
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.
12 #include <linux/netdevice.h>
13 #include <net/l3mdev.h>
16 * l3mdev_master_ifindex - get index of L3 master device
17 * @dev: targeted interface
20 int l3mdev_master_ifindex_rcu(const struct net_device *dev)
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 struct net_device *_dev = (struct net_device *)dev;
33 /* netdev_master_upper_dev_get_rcu calls
34 * list_first_or_null_rcu to walk the upper dev list.
35 * list_first_or_null_rcu does not handle a const arg. We aren't
36 * making changes, just want the master device from that list so
37 * typecast to remove the const
39 master = netdev_master_upper_dev_get_rcu(_dev);
41 ifindex = master->ifindex;
46 EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
49 * l3mdev_fib_table - get FIB table id associated with an L3
51 * @dev: targeted interface
54 u32 l3mdev_fib_table_rcu(const struct net_device *dev)
61 if (netif_is_l3_master(dev)) {
62 if (dev->l3mdev_ops->l3mdev_fib_table)
63 tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
64 } else if (netif_is_l3_slave(dev)) {
65 /* Users of netdev_master_upper_dev_get_rcu need non-const,
66 * but current inet_*type functions take a const
68 struct net_device *_dev = (struct net_device *) dev;
69 const struct net_device *master;
71 master = netdev_master_upper_dev_get_rcu(_dev);
73 master->l3mdev_ops->l3mdev_fib_table)
74 tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
79 EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
81 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
83 struct net_device *dev;
91 dev = dev_get_by_index_rcu(net, ifindex);
93 tb_id = l3mdev_fib_table_rcu(dev);
99 EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
102 * l3mdev_get_rt6_dst - IPv6 route lookup based on flow. Returns
103 * cached route for L3 master device if relevant
105 * @net: network namespace for device index lookup
106 * @fl6: IPv6 flow struct for lookup
109 struct dst_entry *l3mdev_get_rt6_dst(struct net *net,
110 const struct flowi6 *fl6)
112 struct dst_entry *dst = NULL;
113 struct net_device *dev;
115 if (fl6->flowi6_oif) {
118 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
119 if (dev && netif_is_l3_slave(dev))
120 dev = netdev_master_upper_dev_get_rcu(dev);
122 if (dev && netif_is_l3_master(dev) &&
123 dev->l3mdev_ops->l3mdev_get_rt6_dst)
124 dst = dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
131 EXPORT_SYMBOL_GPL(l3mdev_get_rt6_dst);
134 * l3mdev_get_saddr - get source address for a flow based on an interface
135 * enslaved to an L3 master device
136 * @net: network namespace for device index lookup
137 * @ifindex: Interface index
138 * @fl4: IPv4 flow struct
141 int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4)
143 struct net_device *dev;
149 dev = dev_get_by_index_rcu(net, ifindex);
150 if (dev && netif_is_l3_slave(dev))
151 dev = netdev_master_upper_dev_get_rcu(dev);
153 if (dev && netif_is_l3_master(dev) &&
154 dev->l3mdev_ops->l3mdev_get_saddr)
155 rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
162 EXPORT_SYMBOL_GPL(l3mdev_get_saddr);