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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 | /** | |
103 | * l3mdev_get_rt6_dst - IPv6 route lookup based on flow. Returns | |
104 | * cached route for L3 master device if relevant | |
105 | * to flow | |
106 | * @net: network namespace for device index lookup | |
107 | * @fl6: IPv6 flow struct for lookup | |
108 | */ | |
109 | ||
110 | struct dst_entry *l3mdev_get_rt6_dst(struct net *net, | |
cd2a9e62 | 111 | struct flowi6 *fl6) |
4a65896f DA |
112 | { |
113 | struct dst_entry *dst = NULL; | |
114 | struct net_device *dev; | |
115 | ||
1ff23bee DA |
116 | if (fl6->flowi6_oif) { |
117 | rcu_read_lock(); | |
118 | ||
119 | dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); | |
120 | if (dev && netif_is_l3_slave(dev)) | |
121 | dev = netdev_master_upper_dev_get_rcu(dev); | |
122 | ||
123 | if (dev && netif_is_l3_master(dev) && | |
4a65896f DA |
124 | dev->l3mdev_ops->l3mdev_get_rt6_dst) |
125 | dst = dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6); | |
1ff23bee DA |
126 | |
127 | rcu_read_unlock(); | |
4a65896f DA |
128 | } |
129 | ||
130 | return dst; | |
131 | } | |
132 | EXPORT_SYMBOL_GPL(l3mdev_get_rt6_dst); | |
133 | ||
134 | /** | |
135 | * l3mdev_get_saddr - get source address for a flow based on an interface | |
136 | * enslaved to an L3 master device | |
137 | * @net: network namespace for device index lookup | |
138 | * @ifindex: Interface index | |
139 | * @fl4: IPv4 flow struct | |
140 | */ | |
141 | ||
142 | int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4) | |
143 | { | |
144 | struct net_device *dev; | |
145 | int rc = 0; | |
146 | ||
147 | if (ifindex) { | |
148 | rcu_read_lock(); | |
149 | ||
150 | dev = dev_get_by_index_rcu(net, ifindex); | |
1ff23bee DA |
151 | if (dev && netif_is_l3_slave(dev)) |
152 | dev = netdev_master_upper_dev_get_rcu(dev); | |
153 | ||
4a65896f DA |
154 | if (dev && netif_is_l3_master(dev) && |
155 | dev->l3mdev_ops->l3mdev_get_saddr) | |
156 | rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4); | |
157 | ||
158 | rcu_read_unlock(); | |
159 | } | |
160 | ||
161 | return rc; | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(l3mdev_get_saddr); | |
96c63fa7 | 164 | |
0d240e78 DA |
165 | int l3mdev_get_saddr6(struct net *net, const struct sock *sk, |
166 | struct flowi6 *fl6) | |
167 | { | |
168 | struct net_device *dev; | |
169 | int rc = 0; | |
170 | ||
171 | if (fl6->flowi6_oif) { | |
172 | rcu_read_lock(); | |
173 | ||
174 | dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); | |
175 | if (dev && netif_is_l3_slave(dev)) | |
176 | dev = netdev_master_upper_dev_get_rcu(dev); | |
177 | ||
178 | if (dev && netif_is_l3_master(dev) && | |
179 | dev->l3mdev_ops->l3mdev_get_saddr6) | |
180 | rc = dev->l3mdev_ops->l3mdev_get_saddr6(dev, sk, fl6); | |
181 | ||
182 | rcu_read_unlock(); | |
183 | } | |
184 | ||
185 | return rc; | |
186 | } | |
187 | EXPORT_SYMBOL_GPL(l3mdev_get_saddr6); | |
188 | ||
96c63fa7 DA |
189 | /** |
190 | * l3mdev_fib_rule_match - Determine if flowi references an | |
191 | * L3 master device | |
192 | * @net: network namespace for device index lookup | |
193 | * @fl: flow struct | |
194 | */ | |
195 | ||
196 | int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, | |
197 | struct fib_lookup_arg *arg) | |
198 | { | |
199 | struct net_device *dev; | |
200 | int rc = 0; | |
201 | ||
202 | rcu_read_lock(); | |
203 | ||
204 | dev = dev_get_by_index_rcu(net, fl->flowi_oif); | |
205 | if (dev && netif_is_l3_master(dev) && | |
206 | dev->l3mdev_ops->l3mdev_fib_table) { | |
207 | arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev); | |
208 | rc = 1; | |
209 | goto out; | |
210 | } | |
211 | ||
212 | dev = dev_get_by_index_rcu(net, fl->flowi_iif); | |
213 | if (dev && netif_is_l3_master(dev) && | |
214 | dev->l3mdev_ops->l3mdev_fib_table) { | |
215 | arg->table = dev->l3mdev_ops->l3mdev_fib_table(dev); | |
216 | rc = 1; | |
217 | goto out; | |
218 | } | |
219 | ||
220 | out: | |
221 | rcu_read_unlock(); | |
222 | ||
223 | return rc; | |
224 | } |