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1b69c6d0 DA |
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 | ||
3f2fb9a8 | 20 | int l3mdev_master_ifindex_rcu(const struct net_device *dev) |
1b69c6d0 DA |
21 | { |
22 | int ifindex = 0; | |
23 | ||
24 | if (!dev) | |
25 | return 0; | |
26 | ||
27 | if (netif_is_l3_master(dev)) { | |
28 | ifindex = dev->ifindex; | |
fee6d4c7 | 29 | } else if (netif_is_l3_slave(dev)) { |
1b69c6d0 | 30 | struct net_device *master; |
3f2fb9a8 DA |
31 | struct net_device *_dev = (struct net_device *)dev; |
32 | ||
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 | |
38 | */ | |
39 | master = netdev_master_upper_dev_get_rcu(_dev); | |
fee6d4c7 | 40 | if (master) |
1b69c6d0 DA |
41 | ifindex = master->ifindex; |
42 | } | |
43 | ||
44 | return ifindex; | |
45 | } | |
46 | EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu); | |
47 | ||
48 | /** | |
49 | * l3mdev_fib_table - get FIB table id associated with an L3 | |
50 | * master interface | |
51 | * @dev: targeted interface | |
52 | */ | |
53 | ||
54 | u32 l3mdev_fib_table_rcu(const struct net_device *dev) | |
55 | { | |
56 | u32 tb_id = 0; | |
57 | ||
58 | if (!dev) | |
59 | return 0; | |
60 | ||
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); | |
fee6d4c7 | 64 | } else if (netif_is_l3_slave(dev)) { |
1b69c6d0 DA |
65 | /* Users of netdev_master_upper_dev_get_rcu need non-const, |
66 | * but current inet_*type functions take a const | |
67 | */ | |
68 | struct net_device *_dev = (struct net_device *) dev; | |
69 | const struct net_device *master; | |
70 | ||
71 | master = netdev_master_upper_dev_get_rcu(_dev); | |
fee6d4c7 | 72 | if (master && |
1b69c6d0 DA |
73 | master->l3mdev_ops->l3mdev_fib_table) |
74 | tb_id = master->l3mdev_ops->l3mdev_fib_table(master); | |
75 | } | |
76 | ||
77 | return tb_id; | |
78 | } | |
79 | EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu); | |
80 | ||
81 | u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) | |
82 | { | |
83 | struct net_device *dev; | |
84 | u32 tb_id = 0; | |
85 | ||
86 | if (!ifindex) | |
87 | return 0; | |
88 | ||
89 | rcu_read_lock(); | |
90 | ||
91 | dev = dev_get_by_index_rcu(net, ifindex); | |
92 | if (dev) | |
93 | tb_id = l3mdev_fib_table_rcu(dev); | |
94 | ||
95 | rcu_read_unlock(); | |
96 | ||
97 | return tb_id; | |
98 | } | |
99 | EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index); |