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/fib_rules.h>
14 #include <net/l3mdev.h>
17 * l3mdev_master_ifindex - get index of L3 master device
18 * @dev: targeted interface
21 int l3mdev_master_ifindex_rcu(const struct net_device *dev)
28 if (netif_is_l3_master(dev)) {
29 ifindex = dev->ifindex;
30 } else if (netif_is_l3_slave(dev)) {
31 struct net_device *master;
32 struct net_device *_dev = (struct net_device *)dev;
34 /* netdev_master_upper_dev_get_rcu calls
35 * list_first_or_null_rcu to walk the upper dev list.
36 * list_first_or_null_rcu does not handle a const arg. We aren't
37 * making changes, just want the master device from that list so
38 * typecast to remove the const
40 master = netdev_master_upper_dev_get_rcu(_dev);
42 ifindex = master->ifindex;
47 EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
50 * l3mdev_master_upper_ifindex_by_index - get index of upper l3 master
52 * @net: network namespace for device index lookup
53 * @ifindex: targeted interface
55 int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
57 struct net_device *dev;
59 dev = dev_get_by_index_rcu(net, ifindex);
60 while (dev && !netif_is_l3_master(dev))
61 dev = netdev_master_upper_dev_get(dev);
63 return dev ? dev->ifindex : 0;
65 EXPORT_SYMBOL_GPL(l3mdev_master_upper_ifindex_by_index_rcu);
68 * l3mdev_fib_table - get FIB table id associated with an L3
70 * @dev: targeted interface
73 u32 l3mdev_fib_table_rcu(const struct net_device *dev)
80 if (netif_is_l3_master(dev)) {
81 if (dev->l3mdev_ops->l3mdev_fib_table)
82 tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
83 } else if (netif_is_l3_slave(dev)) {
84 /* Users of netdev_master_upper_dev_get_rcu need non-const,
85 * but current inet_*type functions take a const
87 struct net_device *_dev = (struct net_device *) dev;
88 const struct net_device *master;
90 master = netdev_master_upper_dev_get_rcu(_dev);
92 master->l3mdev_ops->l3mdev_fib_table)
93 tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
98 EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
100 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
102 struct net_device *dev;
110 dev = dev_get_by_index_rcu(net, ifindex);
112 tb_id = l3mdev_fib_table_rcu(dev);
118 EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
121 * l3mdev_link_scope_lookup - IPv6 route lookup based on flow for link
122 * local and multicast addresses
123 * @net: network namespace for device index lookup
124 * @fl6: IPv6 flow struct for lookup
127 struct dst_entry *l3mdev_link_scope_lookup(struct net *net,
130 struct dst_entry *dst = NULL;
131 struct net_device *dev;
133 if (fl6->flowi6_oif) {
136 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
137 if (dev && netif_is_l3_slave(dev))
138 dev = netdev_master_upper_dev_get_rcu(dev);
140 if (dev && netif_is_l3_master(dev) &&
141 dev->l3mdev_ops->l3mdev_link_scope_lookup)
142 dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6);
149 EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup);
152 * l3mdev_fib_rule_match - Determine if flowi references an
154 * @net: network namespace for device index lookup
158 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
159 struct fib_lookup_arg *arg)
161 struct net_device *dev;
166 dev = dev_get_by_index_rcu(net, fl->flowi_oif);
167 if (dev && netif_is_l3_master(dev) &&
168 dev->l3mdev_ops->l3mdev_fib_table) {
169 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
174 dev = dev_get_by_index_rcu(net, fl->flowi_iif);
175 if (dev && netif_is_l3_master(dev) &&
176 dev->l3mdev_ops->l3mdev_fib_table) {
177 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
188 void l3mdev_update_flow(struct net *net, struct flowi *fl)
190 struct net_device *dev;
196 dev = dev_get_by_index_rcu(net, fl->flowi_oif);
198 ifindex = l3mdev_master_ifindex_rcu(dev);
200 fl->flowi_oif = ifindex;
201 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
208 dev = dev_get_by_index_rcu(net, fl->flowi_iif);
210 ifindex = l3mdev_master_ifindex_rcu(dev);
212 fl->flowi_iif = ifindex;
213 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
221 EXPORT_SYMBOL_GPL(l3mdev_update_flow);