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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1b69c6d0 DA |
2 | /* |
3 | * include/net/l3mdev.h - L3 master device API | |
4 | * Copyright (c) 2015 Cumulus Networks | |
5 | * Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com> | |
1b69c6d0 DA |
6 | */ |
7 | #ifndef _NET_L3MDEV_H_ | |
8 | #define _NET_L3MDEV_H_ | |
9 | ||
a8e3e1a9 | 10 | #include <net/dst.h> |
96c63fa7 DA |
11 | #include <net/fib_rules.h> |
12 | ||
1b69c6d0 DA |
13 | /** |
14 | * struct l3mdev_ops - l3mdev operations | |
15 | * | |
16 | * @l3mdev_fib_table: Get FIB table id to use for lookups | |
17 | * | |
a8e3e1a9 DA |
18 | * @l3mdev_l3_rcv: Hook in L3 receive path |
19 | * | |
20 | * @l3mdev_l3_out: Hook in L3 output path | |
21 | * | |
4c1feac5 | 22 | * @l3mdev_link_scope_lookup: IPv6 lookup for linklocal and mcast destinations |
1b69c6d0 DA |
23 | */ |
24 | ||
25 | struct l3mdev_ops { | |
26 | u32 (*l3mdev_fib_table)(const struct net_device *dev); | |
74b20582 DA |
27 | struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev, |
28 | struct sk_buff *skb, u16 proto); | |
a8e3e1a9 DA |
29 | struct sk_buff * (*l3mdev_l3_out)(struct net_device *dev, |
30 | struct sock *sk, struct sk_buff *skb, | |
31 | u16 proto); | |
ccf3c8c3 | 32 | |
ccf3c8c3 | 33 | /* IPv6 ops */ |
4c1feac5 | 34 | struct dst_entry * (*l3mdev_link_scope_lookup)(const struct net_device *dev, |
cd2a9e62 | 35 | struct flowi6 *fl6); |
1b69c6d0 DA |
36 | }; |
37 | ||
38 | #ifdef CONFIG_NET_L3_MASTER_DEV | |
39 | ||
96c63fa7 DA |
40 | int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, |
41 | struct fib_lookup_arg *arg); | |
42 | ||
9ee0034b DA |
43 | void l3mdev_update_flow(struct net *net, struct flowi *fl); |
44 | ||
3f2fb9a8 | 45 | int l3mdev_master_ifindex_rcu(const struct net_device *dev); |
1b69c6d0 DA |
46 | static inline int l3mdev_master_ifindex(struct net_device *dev) |
47 | { | |
48 | int ifindex; | |
49 | ||
50 | rcu_read_lock(); | |
51 | ifindex = l3mdev_master_ifindex_rcu(dev); | |
52 | rcu_read_unlock(); | |
53 | ||
54 | return ifindex; | |
55 | } | |
56 | ||
1a852479 DA |
57 | static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) |
58 | { | |
59 | struct net_device *dev; | |
60 | int rc = 0; | |
61 | ||
62 | if (likely(ifindex)) { | |
63 | rcu_read_lock(); | |
64 | ||
65 | dev = dev_get_by_index_rcu(net, ifindex); | |
66 | if (dev) | |
67 | rc = l3mdev_master_ifindex_rcu(dev); | |
68 | ||
69 | rcu_read_unlock(); | |
70 | } | |
71 | ||
72 | return rc; | |
73 | } | |
74 | ||
afbac601 | 75 | static inline |
5f02ce24 | 76 | struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev) |
afbac601 DA |
77 | { |
78 | /* netdev_master_upper_dev_get_rcu calls | |
79 | * list_first_or_null_rcu to walk the upper dev list. | |
80 | * list_first_or_null_rcu does not handle a const arg. We aren't | |
81 | * making changes, just want the master device from that list so | |
82 | * typecast to remove the const | |
83 | */ | |
84 | struct net_device *dev = (struct net_device *)_dev; | |
5f02ce24 | 85 | struct net_device *master; |
afbac601 DA |
86 | |
87 | if (!dev) | |
88 | return NULL; | |
89 | ||
90 | if (netif_is_l3_master(dev)) | |
91 | master = dev; | |
92 | else if (netif_is_l3_slave(dev)) | |
93 | master = netdev_master_upper_dev_get_rcu(dev); | |
94 | else | |
95 | master = NULL; | |
96 | ||
97 | return master; | |
98 | } | |
99 | ||
6a6d6681 AB |
100 | int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex); |
101 | static inline | |
102 | int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex) | |
103 | { | |
104 | rcu_read_lock(); | |
105 | ifindex = l3mdev_master_upper_ifindex_by_index_rcu(net, ifindex); | |
106 | rcu_read_unlock(); | |
107 | ||
108 | return ifindex; | |
109 | } | |
110 | ||
1b69c6d0 DA |
111 | u32 l3mdev_fib_table_rcu(const struct net_device *dev); |
112 | u32 l3mdev_fib_table_by_index(struct net *net, int ifindex); | |
113 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
114 | { | |
115 | u32 tb_id; | |
116 | ||
117 | rcu_read_lock(); | |
118 | tb_id = l3mdev_fib_table_rcu(dev); | |
119 | rcu_read_unlock(); | |
120 | ||
121 | return tb_id; | |
122 | } | |
123 | ||
6104e112 DA |
124 | static inline bool netif_index_is_l3_master(struct net *net, int ifindex) |
125 | { | |
126 | struct net_device *dev; | |
127 | bool rc = false; | |
128 | ||
129 | if (ifindex == 0) | |
130 | return false; | |
131 | ||
132 | rcu_read_lock(); | |
133 | ||
134 | dev = dev_get_by_index_rcu(net, ifindex); | |
135 | if (dev) | |
136 | rc = netif_is_l3_master(dev); | |
137 | ||
138 | rcu_read_unlock(); | |
139 | ||
140 | return rc; | |
141 | } | |
142 | ||
4c1feac5 | 143 | struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6); |
ccf3c8c3 | 144 | |
74b20582 DA |
145 | static inline |
146 | struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto) | |
147 | { | |
148 | struct net_device *master = NULL; | |
149 | ||
150 | if (netif_is_l3_slave(skb->dev)) | |
151 | master = netdev_master_upper_dev_get_rcu(skb->dev); | |
d5256083 DB |
152 | else if (netif_is_l3_master(skb->dev) || |
153 | netif_has_l3_rx_handler(skb->dev)) | |
74b20582 DA |
154 | master = skb->dev; |
155 | ||
156 | if (master && master->l3mdev_ops->l3mdev_l3_rcv) | |
157 | skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto); | |
158 | ||
159 | return skb; | |
160 | } | |
161 | ||
162 | static inline | |
163 | struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) | |
164 | { | |
165 | return l3mdev_l3_rcv(skb, AF_INET); | |
166 | } | |
167 | ||
168 | static inline | |
169 | struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) | |
170 | { | |
171 | return l3mdev_l3_rcv(skb, AF_INET6); | |
172 | } | |
173 | ||
a8e3e1a9 DA |
174 | static inline |
175 | struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto) | |
176 | { | |
177 | struct net_device *dev = skb_dst(skb)->dev; | |
178 | ||
179 | if (netif_is_l3_slave(dev)) { | |
180 | struct net_device *master; | |
181 | ||
182 | master = netdev_master_upper_dev_get_rcu(dev); | |
183 | if (master && master->l3mdev_ops->l3mdev_l3_out) | |
184 | skb = master->l3mdev_ops->l3mdev_l3_out(master, sk, | |
185 | skb, proto); | |
186 | } | |
187 | ||
188 | return skb; | |
189 | } | |
190 | ||
191 | static inline | |
192 | struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) | |
193 | { | |
194 | return l3mdev_l3_out(sk, skb, AF_INET); | |
195 | } | |
196 | ||
197 | static inline | |
198 | struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) | |
199 | { | |
200 | return l3mdev_l3_out(sk, skb, AF_INET6); | |
201 | } | |
1b69c6d0 DA |
202 | #else |
203 | ||
3f2fb9a8 | 204 | static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev) |
1b69c6d0 DA |
205 | { |
206 | return 0; | |
207 | } | |
208 | static inline int l3mdev_master_ifindex(struct net_device *dev) | |
209 | { | |
210 | return 0; | |
211 | } | |
212 | ||
1a852479 DA |
213 | static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) |
214 | { | |
215 | return 0; | |
216 | } | |
217 | ||
6a6d6681 AB |
218 | static inline |
219 | int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex) | |
220 | { | |
221 | return 0; | |
222 | } | |
223 | static inline | |
224 | int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex) | |
225 | { | |
226 | return 0; | |
227 | } | |
228 | ||
afbac601 | 229 | static inline |
5f02ce24 | 230 | struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev) |
afbac601 DA |
231 | { |
232 | return NULL; | |
233 | } | |
234 | ||
1b69c6d0 DA |
235 | static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev) |
236 | { | |
237 | return 0; | |
238 | } | |
239 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
240 | { | |
241 | return 0; | |
242 | } | |
243 | static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) | |
244 | { | |
245 | return 0; | |
246 | } | |
247 | ||
6104e112 DA |
248 | static inline bool netif_index_is_l3_master(struct net *net, int ifindex) |
249 | { | |
250 | return false; | |
251 | } | |
252 | ||
ccf3c8c3 | 253 | static inline |
4c1feac5 | 254 | struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6) |
ccf3c8c3 DA |
255 | { |
256 | return NULL; | |
257 | } | |
74b20582 DA |
258 | |
259 | static inline | |
260 | struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) | |
261 | { | |
262 | return skb; | |
263 | } | |
264 | ||
265 | static inline | |
266 | struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) | |
267 | { | |
268 | return skb; | |
269 | } | |
96c63fa7 | 270 | |
a8e3e1a9 DA |
271 | static inline |
272 | struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb) | |
273 | { | |
274 | return skb; | |
275 | } | |
276 | ||
277 | static inline | |
278 | struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb) | |
279 | { | |
280 | return skb; | |
281 | } | |
282 | ||
96c63fa7 DA |
283 | static inline |
284 | int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, | |
285 | struct fib_lookup_arg *arg) | |
286 | { | |
287 | return 1; | |
288 | } | |
9ee0034b DA |
289 | static inline |
290 | void l3mdev_update_flow(struct net *net, struct flowi *fl) | |
291 | { | |
292 | } | |
1b69c6d0 DA |
293 | #endif |
294 | ||
295 | #endif /* _NET_L3MDEV_H_ */ |