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1b69c6d0 DA |
1 | /* |
2 | * include/net/l3mdev.h - L3 master device API | |
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 | #ifndef _NET_L3MDEV_H_ | |
12 | #define _NET_L3MDEV_H_ | |
13 | ||
96c63fa7 DA |
14 | #include <net/fib_rules.h> |
15 | ||
1b69c6d0 DA |
16 | /** |
17 | * struct l3mdev_ops - l3mdev operations | |
18 | * | |
19 | * @l3mdev_fib_table: Get FIB table id to use for lookups | |
20 | * | |
21 | * @l3mdev_get_rtable: Get cached IPv4 rtable (dst_entry) for device | |
8cbb512c DA |
22 | * |
23 | * @l3mdev_get_saddr: Get source address for a flow | |
ccf3c8c3 DA |
24 | * |
25 | * @l3mdev_get_rt6_dst: Get cached IPv6 rt6_info (dst_entry) for device | |
1b69c6d0 DA |
26 | */ |
27 | ||
28 | struct l3mdev_ops { | |
29 | u32 (*l3mdev_fib_table)(const struct net_device *dev); | |
74b20582 DA |
30 | struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev, |
31 | struct sk_buff *skb, u16 proto); | |
ccf3c8c3 DA |
32 | |
33 | /* IPv4 ops */ | |
1b69c6d0 DA |
34 | struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev, |
35 | const struct flowi4 *fl4); | |
b5bdacf3 | 36 | int (*l3mdev_get_saddr)(struct net_device *dev, |
8cbb512c | 37 | struct flowi4 *fl4); |
ccf3c8c3 DA |
38 | |
39 | /* IPv6 ops */ | |
40 | struct dst_entry * (*l3mdev_get_rt6_dst)(const struct net_device *dev, | |
cd2a9e62 | 41 | struct flowi6 *fl6); |
1b69c6d0 DA |
42 | }; |
43 | ||
44 | #ifdef CONFIG_NET_L3_MASTER_DEV | |
45 | ||
96c63fa7 DA |
46 | int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, |
47 | struct fib_lookup_arg *arg); | |
48 | ||
3f2fb9a8 | 49 | int l3mdev_master_ifindex_rcu(const struct net_device *dev); |
1b69c6d0 DA |
50 | static inline int l3mdev_master_ifindex(struct net_device *dev) |
51 | { | |
52 | int ifindex; | |
53 | ||
54 | rcu_read_lock(); | |
55 | ifindex = l3mdev_master_ifindex_rcu(dev); | |
56 | rcu_read_unlock(); | |
57 | ||
58 | return ifindex; | |
59 | } | |
60 | ||
1a852479 DA |
61 | static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) |
62 | { | |
63 | struct net_device *dev; | |
64 | int rc = 0; | |
65 | ||
66 | if (likely(ifindex)) { | |
67 | rcu_read_lock(); | |
68 | ||
69 | dev = dev_get_by_index_rcu(net, ifindex); | |
70 | if (dev) | |
71 | rc = l3mdev_master_ifindex_rcu(dev); | |
72 | ||
73 | rcu_read_unlock(); | |
74 | } | |
75 | ||
76 | return rc; | |
77 | } | |
78 | ||
1b69c6d0 DA |
79 | /* get index of an interface to use for FIB lookups. For devices |
80 | * enslaved to an L3 master device FIB lookups are based on the | |
81 | * master index | |
82 | */ | |
83 | static inline int l3mdev_fib_oif_rcu(struct net_device *dev) | |
84 | { | |
85 | return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex; | |
86 | } | |
87 | ||
88 | static inline int l3mdev_fib_oif(struct net_device *dev) | |
89 | { | |
90 | int oif; | |
91 | ||
92 | rcu_read_lock(); | |
93 | oif = l3mdev_fib_oif_rcu(dev); | |
94 | rcu_read_unlock(); | |
95 | ||
96 | return oif; | |
97 | } | |
98 | ||
99 | u32 l3mdev_fib_table_rcu(const struct net_device *dev); | |
100 | u32 l3mdev_fib_table_by_index(struct net *net, int ifindex); | |
101 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
102 | { | |
103 | u32 tb_id; | |
104 | ||
105 | rcu_read_lock(); | |
106 | tb_id = l3mdev_fib_table_rcu(dev); | |
107 | rcu_read_unlock(); | |
108 | ||
109 | return tb_id; | |
110 | } | |
111 | ||
112 | static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev, | |
113 | const struct flowi4 *fl4) | |
114 | { | |
115 | if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable) | |
116 | return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4); | |
117 | ||
118 | return NULL; | |
119 | } | |
120 | ||
9478d12d DA |
121 | static inline bool netif_index_is_l3_master(struct net *net, int ifindex) |
122 | { | |
123 | struct net_device *dev; | |
124 | bool rc = false; | |
125 | ||
126 | if (ifindex == 0) | |
127 | return false; | |
128 | ||
129 | rcu_read_lock(); | |
130 | ||
131 | dev = dev_get_by_index_rcu(net, ifindex); | |
132 | if (dev) | |
133 | rc = netif_is_l3_master(dev); | |
134 | ||
135 | rcu_read_unlock(); | |
136 | ||
137 | return rc; | |
138 | } | |
139 | ||
4a65896f | 140 | int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4); |
8cbb512c | 141 | |
cd2a9e62 | 142 | struct dst_entry *l3mdev_get_rt6_dst(struct net *net, struct flowi6 *fl6); |
ccf3c8c3 | 143 | |
74b20582 DA |
144 | static inline |
145 | struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto) | |
146 | { | |
147 | struct net_device *master = NULL; | |
148 | ||
149 | if (netif_is_l3_slave(skb->dev)) | |
150 | master = netdev_master_upper_dev_get_rcu(skb->dev); | |
151 | else if (netif_is_l3_master(skb->dev)) | |
152 | master = skb->dev; | |
153 | ||
154 | if (master && master->l3mdev_ops->l3mdev_l3_rcv) | |
155 | skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto); | |
156 | ||
157 | return skb; | |
158 | } | |
159 | ||
160 | static inline | |
161 | struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) | |
162 | { | |
163 | return l3mdev_l3_rcv(skb, AF_INET); | |
164 | } | |
165 | ||
166 | static inline | |
167 | struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) | |
168 | { | |
169 | return l3mdev_l3_rcv(skb, AF_INET6); | |
170 | } | |
171 | ||
1b69c6d0 DA |
172 | #else |
173 | ||
3f2fb9a8 | 174 | static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev) |
1b69c6d0 DA |
175 | { |
176 | return 0; | |
177 | } | |
178 | static inline int l3mdev_master_ifindex(struct net_device *dev) | |
179 | { | |
180 | return 0; | |
181 | } | |
182 | ||
1a852479 DA |
183 | static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex) |
184 | { | |
185 | return 0; | |
186 | } | |
187 | ||
1b69c6d0 DA |
188 | static inline int l3mdev_fib_oif_rcu(struct net_device *dev) |
189 | { | |
190 | return dev ? dev->ifindex : 0; | |
191 | } | |
192 | static inline int l3mdev_fib_oif(struct net_device *dev) | |
193 | { | |
194 | return dev ? dev->ifindex : 0; | |
195 | } | |
196 | ||
197 | static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev) | |
198 | { | |
199 | return 0; | |
200 | } | |
201 | static inline u32 l3mdev_fib_table(const struct net_device *dev) | |
202 | { | |
203 | return 0; | |
204 | } | |
205 | static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex) | |
206 | { | |
207 | return 0; | |
208 | } | |
209 | ||
210 | static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev, | |
211 | const struct flowi4 *fl4) | |
212 | { | |
213 | return NULL; | |
214 | } | |
215 | ||
9478d12d DA |
216 | static inline bool netif_index_is_l3_master(struct net *net, int ifindex) |
217 | { | |
218 | return false; | |
219 | } | |
220 | ||
b5bdacf3 DA |
221 | static inline int l3mdev_get_saddr(struct net *net, int ifindex, |
222 | struct flowi4 *fl4) | |
8cbb512c | 223 | { |
b5bdacf3 | 224 | return 0; |
8cbb512c | 225 | } |
ccf3c8c3 DA |
226 | |
227 | static inline | |
cd2a9e62 | 228 | struct dst_entry *l3mdev_get_rt6_dst(struct net *net, struct flowi6 *fl6) |
ccf3c8c3 DA |
229 | { |
230 | return NULL; | |
231 | } | |
74b20582 DA |
232 | |
233 | static inline | |
234 | struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb) | |
235 | { | |
236 | return skb; | |
237 | } | |
238 | ||
239 | static inline | |
240 | struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb) | |
241 | { | |
242 | return skb; | |
243 | } | |
96c63fa7 DA |
244 | |
245 | static inline | |
246 | int l3mdev_fib_rule_match(struct net *net, struct flowi *fl, | |
247 | struct fib_lookup_arg *arg) | |
248 | { | |
249 | return 1; | |
250 | } | |
1b69c6d0 DA |
251 | #endif |
252 | ||
253 | #endif /* _NET_L3MDEV_H_ */ |