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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
14#include <net/dst.h>
15#include <net/fib_rules.h>
16
17/**
18 * struct l3mdev_ops - l3mdev operations
19 *
20 * @l3mdev_fib_table: Get FIB table id to use for lookups
21 *
22 * @l3mdev_l3_rcv: Hook in L3 receive path
23 *
24 * @l3mdev_l3_out: Hook in L3 output path
25 *
26 * @l3mdev_link_scope_lookup: IPv6 lookup for linklocal and mcast destinations
27 */
28
29struct l3mdev_ops {
30 u32 (*l3mdev_fib_table)(const struct net_device *dev);
31 struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev,
32 struct sk_buff *skb, u16 proto);
33 struct sk_buff * (*l3mdev_l3_out)(struct net_device *dev,
34 struct sock *sk, struct sk_buff *skb,
35 u16 proto);
36
37 /* IPv6 ops */
38 struct dst_entry * (*l3mdev_link_scope_lookup)(const struct net_device *dev,
39 struct flowi6 *fl6);
40};
41
42#ifdef CONFIG_NET_L3_MASTER_DEV
43
44int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
45 struct fib_lookup_arg *arg);
46
47void l3mdev_update_flow(struct net *net, struct flowi *fl);
48
49int l3mdev_master_ifindex_rcu(const struct net_device *dev);
50static 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
61static 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
79static inline
80struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
81{
82 /* netdev_master_upper_dev_get_rcu calls
83 * list_first_or_null_rcu to walk the upper dev list.
84 * list_first_or_null_rcu does not handle a const arg. We aren't
85 * making changes, just want the master device from that list so
86 * typecast to remove the const
87 */
88 struct net_device *dev = (struct net_device *)_dev;
89 struct net_device *master;
90
91 if (!dev)
92 return NULL;
93
94 if (netif_is_l3_master(dev))
95 master = dev;
96 else if (netif_is_l3_slave(dev))
97 master = netdev_master_upper_dev_get_rcu(dev);
98 else
99 master = NULL;
100
101 return master;
102}
103
104u32 l3mdev_fib_table_rcu(const struct net_device *dev);
105u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
106static inline u32 l3mdev_fib_table(const struct net_device *dev)
107{
108 u32 tb_id;
109
110 rcu_read_lock();
111 tb_id = l3mdev_fib_table_rcu(dev);
112 rcu_read_unlock();
113
114 return tb_id;
115}
116
117static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
118{
119 struct net_device *dev;
120 bool rc = false;
121
122 if (ifindex == 0)
123 return false;
124
125 rcu_read_lock();
126
127 dev = dev_get_by_index_rcu(net, ifindex);
128 if (dev)
129 rc = netif_is_l3_master(dev);
130
131 rcu_read_unlock();
132
133 return rc;
134}
135
136struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6);
137
138static inline
139struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto)
140{
141 struct net_device *master = NULL;
142
143 if (netif_is_l3_slave(skb->dev))
144 master = netdev_master_upper_dev_get_rcu(skb->dev);
145 else if (netif_is_l3_master(skb->dev))
146 master = skb->dev;
147
148 if (master && master->l3mdev_ops->l3mdev_l3_rcv)
149 skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto);
150
151 return skb;
152}
153
154static inline
155struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
156{
157 return l3mdev_l3_rcv(skb, AF_INET);
158}
159
160static inline
161struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
162{
163 return l3mdev_l3_rcv(skb, AF_INET6);
164}
165
166static inline
167struct sk_buff *l3mdev_l3_out(struct sock *sk, struct sk_buff *skb, u16 proto)
168{
169 struct net_device *dev = skb_dst(skb)->dev;
170
171 if (netif_is_l3_slave(dev)) {
172 struct net_device *master;
173
174 master = netdev_master_upper_dev_get_rcu(dev);
175 if (master && master->l3mdev_ops->l3mdev_l3_out)
176 skb = master->l3mdev_ops->l3mdev_l3_out(master, sk,
177 skb, proto);
178 }
179
180 return skb;
181}
182
183static inline
184struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
185{
186 return l3mdev_l3_out(sk, skb, AF_INET);
187}
188
189static inline
190struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
191{
192 return l3mdev_l3_out(sk, skb, AF_INET6);
193}
194#else
195
196static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
197{
198 return 0;
199}
200static inline int l3mdev_master_ifindex(struct net_device *dev)
201{
202 return 0;
203}
204
205static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
206{
207 return 0;
208}
209
210static inline
211struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
212{
213 return NULL;
214}
215
216static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
217{
218 return 0;
219}
220static inline u32 l3mdev_fib_table(const struct net_device *dev)
221{
222 return 0;
223}
224static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
225{
226 return 0;
227}
228
229static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
230{
231 return false;
232}
233
234static inline
235struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6)
236{
237 return NULL;
238}
239
240static inline
241struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
242{
243 return skb;
244}
245
246static inline
247struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
248{
249 return skb;
250}
251
252static inline
253struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
254{
255 return skb;
256}
257
258static inline
259struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
260{
261 return skb;
262}
263
264static inline
265int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
266 struct fib_lookup_arg *arg)
267{
268 return 1;
269}
270static inline
271void l3mdev_update_flow(struct net *net, struct flowi *fl)
272{
273}
274#endif
275
276#endif /* _NET_L3MDEV_H_ */