Commit | Line | Data |
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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> | |
96c63fa7 | 13 | #include <net/fib_rules.h> |
1b69c6d0 DA |
14 | #include <net/l3mdev.h> |
15 | ||
16 | /** | |
17 | * l3mdev_master_ifindex - get index of L3 master device | |
18 | * @dev: targeted interface | |
19 | */ | |
20 | ||
3f2fb9a8 | 21 | int l3mdev_master_ifindex_rcu(const struct net_device *dev) |
1b69c6d0 DA |
22 | { |
23 | int ifindex = 0; | |
24 | ||
25 | if (!dev) | |
26 | return 0; | |
27 | ||
28 | if (netif_is_l3_master(dev)) { | |
29 | ifindex = dev->ifindex; | |
fee6d4c7 | 30 | } else if (netif_is_l3_slave(dev)) { |
1b69c6d0 | 31 | struct net_device *master; |
3f2fb9a8 DA |
32 | struct net_device *_dev = (struct net_device *)dev; |
33 | ||
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 | |
39 | */ | |
40 | master = netdev_master_upper_dev_get_rcu(_dev); | |
fee6d4c7 | 41 | if (master) |
1b69c6d0 DA |
42 | ifindex = master->ifindex; |
43 | } | |
44 | ||
45 | return ifindex; | |
46 | } | |
47 | EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu); | |
48 | ||
49 | /** | |
50 | * l3mdev_fib_table - get FIB table id associated with an L3 | |
51 | * master interface | |
52 | * @dev: targeted interface | |
53 | */ | |
54 | ||
55 | u32 l3mdev_fib_table_rcu(const struct net_device *dev) | |
56 | { | |
57 | u32 tb_id = 0; | |
58 | ||
59 | if (!dev) | |
60 | return 0; | |
61 | ||
62 | if (netif_is_l3_master(dev)) { | |
63 | if (dev->l3mdev_ops->l3mdev_fib_table) | |
64 | tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev); | |
fee6d4c7 | 65 | } else if (netif_is_l3_slave(dev)) { |
1b69c6d0 DA |
66 | /* Users of netdev_master_upper_dev_get_rcu need non-const, |
67 | * but current inet_*type functions take a const | |
68 | */ | |
69 | struct net_device *_dev = (struct net_device *) dev; | |
70 | const struct net_device *master; | |
71 | ||
72 | master = netdev_master_upper_dev_get_rcu(_dev); | |
fee6d4c7 | 73 | if (master && |
1b69c6d0 DA |
74 | master->l3mdev_ops->l3mdev_fib_table) |
75 | tb_id = master->l3mdev_ops->l3mdev_fib_table(master); | |
76 | } | |
77 | ||
78 | return tb_id; | |
79 | } | |
80 | EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu); | |
81 | ||
82 | u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) | |
83 | { | |
84 | struct net_device *dev; | |
85 | u32 tb_id = 0; | |
86 | ||
87 | if (!ifindex) | |
88 | return 0; | |
89 | ||
90 | rcu_read_lock(); | |
91 | ||
92 | dev = dev_get_by_index_rcu(net, ifindex); | |
93 | if (dev) | |
94 | tb_id = l3mdev_fib_table_rcu(dev); | |
95 | ||
96 | rcu_read_unlock(); | |
97 | ||
98 | return tb_id; | |
99 | } | |
100 | EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index); | |
4a65896f DA |
101 | |
102 | /** | |
4c1feac5 DA |
103 | * l3mdev_link_scope_lookup - IPv6 route lookup based on flow for link |
104 | * local and multicast addresses | |
4a65896f DA |
105 | * @net: network namespace for device index lookup |
106 | * @fl6: IPv6 flow struct for lookup | |
107 | */ | |
108 | ||
4c1feac5 DA |
109 | struct dst_entry *l3mdev_link_scope_lookup(struct net *net, |
110 | struct flowi6 *fl6) | |
4a65896f DA |
111 | { |
112 | struct dst_entry *dst = NULL; | |
113 | struct net_device *dev; | |
114 | ||
1ff23bee DA |
115 | if (fl6->flowi6_oif) { |
116 | rcu_read_lock(); | |
117 | ||
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); | |
121 | ||
122 | if (dev && netif_is_l3_master(dev) && | |
4c1feac5 DA |
123 | dev->l3mdev_ops->l3mdev_link_scope_lookup) |
124 | dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6); | |
1ff23bee DA |
125 | |
126 | rcu_read_unlock(); | |
4a65896f DA |
127 | } |
128 | ||
129 | return dst; | |
130 | } | |
4c1feac5 | 131 | EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup); |
4a65896f | 132 | |
96c63fa7 DA |
133 | /** |
134 | * l3mdev_fib_rule_match - Determine if flowi references an | |
135 | * L3 master device | |
136 | * @net: network namespace for device index lookup | |
137 | * @fl: flow struct | |
138 | */ | |
139 | ||
140 | int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, | |
141 | struct fib_lookup_arg *arg) | |
142 | { | |
143 | struct net_device *dev; | |
144 | int rc = 0; | |
145 | ||
146 | rcu_read_lock(); | |
147 | ||
148 | dev = dev_get_by_index_rcu(net, fl->flowi_oif); | |
149 | if (dev && netif_is_l3_master(dev) && | |
150 | dev->l3mdev_ops->l3mdev_fib_table) { | |
151 | arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev); | |
152 | rc = 1; | |
153 | goto out; | |
154 | } | |
155 | ||
156 | dev = dev_get_by_index_rcu(net, fl->flowi_iif); | |
157 | if (dev && netif_is_l3_master(dev) && | |
158 | dev->l3mdev_ops->l3mdev_fib_table) { | |
159 | arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev); | |
160 | rc = 1; | |
161 | goto out; | |
162 | } | |
163 | ||
164 | out: | |
165 | rcu_read_unlock(); | |
166 | ||
167 | return rc; | |
168 | } | |
9ee0034b DA |
169 | |
170 | void l3mdev_update_flow(struct net *net, struct flowi *fl) | |
171 | { | |
172 | struct net_device *dev; | |
173 | int ifindex; | |
174 | ||
175 | rcu_read_lock(); | |
176 | ||
177 | if (fl->flowi_oif) { | |
178 | dev = dev_get_by_index_rcu(net, fl->flowi_oif); | |
179 | if (dev) { | |
180 | ifindex = l3mdev_master_ifindex_rcu(dev); | |
181 | if (ifindex) { | |
182 | fl->flowi_oif = ifindex; | |
183 | fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
184 | goto out; | |
185 | } | |
186 | } | |
187 | } | |
188 | ||
189 | if (fl->flowi_iif) { | |
190 | dev = dev_get_by_index_rcu(net, fl->flowi_iif); | |
191 | if (dev) { | |
192 | ifindex = l3mdev_master_ifindex_rcu(dev); | |
193 | if (ifindex) { | |
194 | fl->flowi_iif = ifindex; | |
195 | fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
196 | } | |
197 | } | |
198 | } | |
199 | ||
200 | out: | |
201 | rcu_read_unlock(); | |
202 | } | |
203 | EXPORT_SYMBOL_GPL(l3mdev_update_flow); |