Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1b69c6d0 DA |
2 | /* |
3 | * net/l3mdev/l3mdev.c - L3 master device implementation | |
4 | * Copyright (c) 2015 Cumulus Networks | |
5 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
1b69c6d0 DA |
6 | */ |
7 | ||
8 | #include <linux/netdevice.h> | |
96c63fa7 | 9 | #include <net/fib_rules.h> |
1b69c6d0 DA |
10 | #include <net/l3mdev.h> |
11 | ||
12 | /** | |
13 | * l3mdev_master_ifindex - get index of L3 master device | |
14 | * @dev: targeted interface | |
15 | */ | |
16 | ||
3f2fb9a8 | 17 | int l3mdev_master_ifindex_rcu(const struct net_device *dev) |
1b69c6d0 DA |
18 | { |
19 | int ifindex = 0; | |
20 | ||
21 | if (!dev) | |
22 | return 0; | |
23 | ||
24 | if (netif_is_l3_master(dev)) { | |
25 | ifindex = dev->ifindex; | |
fee6d4c7 | 26 | } else if (netif_is_l3_slave(dev)) { |
1b69c6d0 | 27 | struct net_device *master; |
3f2fb9a8 DA |
28 | struct net_device *_dev = (struct net_device *)dev; |
29 | ||
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 | |
35 | */ | |
36 | master = netdev_master_upper_dev_get_rcu(_dev); | |
fee6d4c7 | 37 | if (master) |
1b69c6d0 DA |
38 | ifindex = master->ifindex; |
39 | } | |
40 | ||
41 | return ifindex; | |
42 | } | |
43 | EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu); | |
44 | ||
6a6d6681 AB |
45 | /** |
46 | * l3mdev_master_upper_ifindex_by_index - get index of upper l3 master | |
47 | * device | |
48 | * @net: network namespace for device index lookup | |
49 | * @ifindex: targeted interface | |
50 | */ | |
51 | int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex) | |
52 | { | |
53 | struct net_device *dev; | |
54 | ||
55 | dev = dev_get_by_index_rcu(net, ifindex); | |
56 | while (dev && !netif_is_l3_master(dev)) | |
57 | dev = netdev_master_upper_dev_get(dev); | |
58 | ||
59 | return dev ? dev->ifindex : 0; | |
60 | } | |
61 | EXPORT_SYMBOL_GPL(l3mdev_master_upper_ifindex_by_index_rcu); | |
62 | ||
1b69c6d0 DA |
63 | /** |
64 | * l3mdev_fib_table - get FIB table id associated with an L3 | |
65 | * master interface | |
66 | * @dev: targeted interface | |
67 | */ | |
68 | ||
69 | u32 l3mdev_fib_table_rcu(const struct net_device *dev) | |
70 | { | |
71 | u32 tb_id = 0; | |
72 | ||
73 | if (!dev) | |
74 | return 0; | |
75 | ||
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); | |
fee6d4c7 | 79 | } else if (netif_is_l3_slave(dev)) { |
1b69c6d0 DA |
80 | /* Users of netdev_master_upper_dev_get_rcu need non-const, |
81 | * but current inet_*type functions take a const | |
82 | */ | |
83 | struct net_device *_dev = (struct net_device *) dev; | |
84 | const struct net_device *master; | |
85 | ||
86 | master = netdev_master_upper_dev_get_rcu(_dev); | |
fee6d4c7 | 87 | if (master && |
1b69c6d0 DA |
88 | master->l3mdev_ops->l3mdev_fib_table) |
89 | tb_id = master->l3mdev_ops->l3mdev_fib_table(master); | |
90 | } | |
91 | ||
92 | return tb_id; | |
93 | } | |
94 | EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu); | |
95 | ||
96 | u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) | |
97 | { | |
98 | struct net_device *dev; | |
99 | u32 tb_id = 0; | |
100 | ||
101 | if (!ifindex) | |
102 | return 0; | |
103 | ||
104 | rcu_read_lock(); | |
105 | ||
106 | dev = dev_get_by_index_rcu(net, ifindex); | |
107 | if (dev) | |
108 | tb_id = l3mdev_fib_table_rcu(dev); | |
109 | ||
110 | rcu_read_unlock(); | |
111 | ||
112 | return tb_id; | |
113 | } | |
114 | EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index); | |
4a65896f DA |
115 | |
116 | /** | |
4c1feac5 DA |
117 | * l3mdev_link_scope_lookup - IPv6 route lookup based on flow for link |
118 | * local and multicast addresses | |
4a65896f DA |
119 | * @net: network namespace for device index lookup |
120 | * @fl6: IPv6 flow struct for lookup | |
7d9e5f42 WW |
121 | * This function does not hold refcnt on the returned dst. |
122 | * Caller must hold rcu_read_lock(). | |
4a65896f DA |
123 | */ |
124 | ||
4c1feac5 DA |
125 | struct dst_entry *l3mdev_link_scope_lookup(struct net *net, |
126 | struct flowi6 *fl6) | |
4a65896f DA |
127 | { |
128 | struct dst_entry *dst = NULL; | |
129 | struct net_device *dev; | |
130 | ||
7d9e5f42 | 131 | WARN_ON_ONCE(!rcu_read_lock_held()); |
1ff23bee | 132 | if (fl6->flowi6_oif) { |
1ff23bee DA |
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); | |
136 | ||
137 | if (dev && netif_is_l3_master(dev) && | |
4c1feac5 DA |
138 | dev->l3mdev_ops->l3mdev_link_scope_lookup) |
139 | dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6); | |
4a65896f DA |
140 | } |
141 | ||
142 | return dst; | |
143 | } | |
4c1feac5 | 144 | EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup); |
4a65896f | 145 | |
96c63fa7 DA |
146 | /** |
147 | * l3mdev_fib_rule_match - Determine if flowi references an | |
148 | * L3 master device | |
149 | * @net: network namespace for device index lookup | |
150 | * @fl: flow struct | |
151 | */ | |
152 | ||
153 | int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, | |
154 | struct fib_lookup_arg *arg) | |
155 | { | |
156 | struct net_device *dev; | |
157 | int rc = 0; | |
158 | ||
159 | rcu_read_lock(); | |
160 | ||
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); | |
165 | rc = 1; | |
166 | goto out; | |
167 | } | |
168 | ||
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); | |
173 | rc = 1; | |
174 | goto out; | |
175 | } | |
176 | ||
177 | out: | |
178 | rcu_read_unlock(); | |
179 | ||
180 | return rc; | |
181 | } | |
9ee0034b DA |
182 | |
183 | void l3mdev_update_flow(struct net *net, struct flowi *fl) | |
184 | { | |
185 | struct net_device *dev; | |
186 | int ifindex; | |
187 | ||
188 | rcu_read_lock(); | |
189 | ||
190 | if (fl->flowi_oif) { | |
191 | dev = dev_get_by_index_rcu(net, fl->flowi_oif); | |
192 | if (dev) { | |
193 | ifindex = l3mdev_master_ifindex_rcu(dev); | |
194 | if (ifindex) { | |
195 | fl->flowi_oif = ifindex; | |
196 | fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
197 | goto out; | |
198 | } | |
199 | } | |
200 | } | |
201 | ||
202 | if (fl->flowi_iif) { | |
203 | dev = dev_get_by_index_rcu(net, fl->flowi_iif); | |
204 | if (dev) { | |
205 | ifindex = l3mdev_master_ifindex_rcu(dev); | |
206 | if (ifindex) { | |
207 | fl->flowi_iif = ifindex; | |
208 | fl->flowi_flags |= FLOWI_FLAG_SKIP_NH_OIF; | |
209 | } | |
210 | } | |
211 | } | |
212 | ||
213 | out: | |
214 | rcu_read_unlock(); | |
215 | } | |
216 | EXPORT_SYMBOL_GPL(l3mdev_update_flow); |