1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * net/l3mdev/l3mdev.c - L3 master device implementation
4 * Copyright (c) 2015 Cumulus Networks
5 * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
8 #include <linux/netdevice.h>
9 #include <net/fib_rules.h>
10 #include <net/l3mdev.h>
13 * l3mdev_master_ifindex - get index of L3 master device
14 * @dev: targeted interface
17 int l3mdev_master_ifindex_rcu(const struct net_device *dev)
24 if (netif_is_l3_master(dev)) {
25 ifindex = dev->ifindex;
26 } else if (netif_is_l3_slave(dev)) {
27 struct net_device *master;
28 struct net_device *_dev = (struct net_device *)dev;
30 /* netdev_master_upper_dev_get_rcu calls
31 * list_first_or_null_rcu to walk the upper dev list.
32 * list_first_or_null_rcu does not handle a const arg. We aren't
33 * making changes, just want the master device from that list so
34 * typecast to remove the const
36 master = netdev_master_upper_dev_get_rcu(_dev);
38 ifindex = master->ifindex;
43 EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
46 * l3mdev_master_upper_ifindex_by_index - get index of upper l3 master
48 * @net: network namespace for device index lookup
49 * @ifindex: targeted interface
51 int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
53 struct net_device *dev;
55 dev = dev_get_by_index_rcu(net, ifindex);
56 while (dev && !netif_is_l3_master(dev))
57 dev = netdev_master_upper_dev_get_rcu(dev);
59 return dev ? dev->ifindex : 0;
61 EXPORT_SYMBOL_GPL(l3mdev_master_upper_ifindex_by_index_rcu);
64 * l3mdev_fib_table - get FIB table id associated with an L3
66 * @dev: targeted interface
69 u32 l3mdev_fib_table_rcu(const struct net_device *dev)
76 if (netif_is_l3_master(dev)) {
77 if (dev->l3mdev_ops->l3mdev_fib_table)
78 tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
79 } else if (netif_is_l3_slave(dev)) {
80 /* Users of netdev_master_upper_dev_get_rcu need non-const,
81 * but current inet_*type functions take a const
83 struct net_device *_dev = (struct net_device *) dev;
84 const struct net_device *master;
86 master = netdev_master_upper_dev_get_rcu(_dev);
88 master->l3mdev_ops->l3mdev_fib_table)
89 tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
94 EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
96 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
98 struct net_device *dev;
106 dev = dev_get_by_index_rcu(net, ifindex);
108 tb_id = l3mdev_fib_table_rcu(dev);
114 EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
117 * l3mdev_link_scope_lookup - IPv6 route lookup based on flow for link
118 * local and multicast addresses
119 * @net: network namespace for device index lookup
120 * @fl6: IPv6 flow struct for lookup
121 * This function does not hold refcnt on the returned dst.
122 * Caller must hold rcu_read_lock().
125 struct dst_entry *l3mdev_link_scope_lookup(struct net *net,
128 struct dst_entry *dst = NULL;
129 struct net_device *dev;
131 WARN_ON_ONCE(!rcu_read_lock_held());
132 if (fl6->flowi6_oif) {
133 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
134 if (dev && netif_is_l3_slave(dev))
135 dev = netdev_master_upper_dev_get_rcu(dev);
137 if (dev && netif_is_l3_master(dev) &&
138 dev->l3mdev_ops->l3mdev_link_scope_lookup)
139 dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6);
144 EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup);
147 * l3mdev_fib_rule_match - Determine if flowi references an
149 * @net: network namespace for device index lookup
153 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
154 struct fib_lookup_arg *arg)
156 struct net_device *dev;
161 dev = dev_get_by_index_rcu(net, fl->flowi_oif);
162 if (dev && netif_is_l3_master(dev) &&
163 dev->l3mdev_ops->l3mdev_fib_table) {
164 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
169 dev = dev_get_by_index_rcu(net, fl->flowi_iif);
170 if (dev && netif_is_l3_master(dev) &&
171 dev->l3mdev_ops->l3mdev_fib_table) {
172 arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev);
183 void l3mdev_update_flow(struct net *net, struct flowi *fl)
185 struct net_device *dev;
191 dev = dev_get_by_index_rcu(net, fl->flowi_oif);
193 ifindex = l3mdev_master_ifindex_rcu(dev);
195 fl->flowi_oif = ifindex;
196 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
203 dev = dev_get_by_index_rcu(net, fl->flowi_iif);
205 ifindex = l3mdev_master_ifindex_rcu(dev);
207 fl->flowi_iif = ifindex;
208 fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF;
216 EXPORT_SYMBOL_GPL(l3mdev_update_flow);