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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/fib_rules.h>
15
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
22 *
23 * @l3mdev_get_saddr: Get source address for a flow
24 *
25 * @l3mdev_get_rt6_dst: Get cached IPv6 rt6_info (dst_entry) for device
26 */
27
28struct l3mdev_ops {
29 u32 (*l3mdev_fib_table)(const struct net_device *dev);
30 struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev,
31 struct sk_buff *skb, u16 proto);
32
33 /* IPv4 ops */
34 struct rtable * (*l3mdev_get_rtable)(const struct net_device *dev,
35 const struct flowi4 *fl4);
36 int (*l3mdev_get_saddr)(struct net_device *dev,
37 struct flowi4 *fl4);
38
39 /* IPv6 ops */
40 struct dst_entry * (*l3mdev_get_rt6_dst)(const struct net_device *dev,
41 struct flowi6 *fl6);
42 int (*l3mdev_get_saddr6)(struct net_device *dev,
43 const struct sock *sk,
44 struct flowi6 *fl6);
45};
46
47#ifdef CONFIG_NET_L3_MASTER_DEV
48
49int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
50 struct fib_lookup_arg *arg);
51
52int l3mdev_master_ifindex_rcu(const struct net_device *dev);
53static inline int l3mdev_master_ifindex(struct net_device *dev)
54{
55 int ifindex;
56
57 rcu_read_lock();
58 ifindex = l3mdev_master_ifindex_rcu(dev);
59 rcu_read_unlock();
60
61 return ifindex;
62}
63
64static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
65{
66 struct net_device *dev;
67 int rc = 0;
68
69 if (likely(ifindex)) {
70 rcu_read_lock();
71
72 dev = dev_get_by_index_rcu(net, ifindex);
73 if (dev)
74 rc = l3mdev_master_ifindex_rcu(dev);
75
76 rcu_read_unlock();
77 }
78
79 return rc;
80}
81
82static inline
83const struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
84{
85 /* netdev_master_upper_dev_get_rcu calls
86 * list_first_or_null_rcu to walk the upper dev list.
87 * list_first_or_null_rcu does not handle a const arg. We aren't
88 * making changes, just want the master device from that list so
89 * typecast to remove the const
90 */
91 struct net_device *dev = (struct net_device *)_dev;
92 const struct net_device *master;
93
94 if (!dev)
95 return NULL;
96
97 if (netif_is_l3_master(dev))
98 master = dev;
99 else if (netif_is_l3_slave(dev))
100 master = netdev_master_upper_dev_get_rcu(dev);
101 else
102 master = NULL;
103
104 return master;
105}
106
107/* get index of an interface to use for FIB lookups. For devices
108 * enslaved to an L3 master device FIB lookups are based on the
109 * master index
110 */
111static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
112{
113 return l3mdev_master_ifindex_rcu(dev) ? : dev->ifindex;
114}
115
116static inline int l3mdev_fib_oif(struct net_device *dev)
117{
118 int oif;
119
120 rcu_read_lock();
121 oif = l3mdev_fib_oif_rcu(dev);
122 rcu_read_unlock();
123
124 return oif;
125}
126
127u32 l3mdev_fib_table_rcu(const struct net_device *dev);
128u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
129static inline u32 l3mdev_fib_table(const struct net_device *dev)
130{
131 u32 tb_id;
132
133 rcu_read_lock();
134 tb_id = l3mdev_fib_table_rcu(dev);
135 rcu_read_unlock();
136
137 return tb_id;
138}
139
140static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
141 const struct flowi4 *fl4)
142{
143 if (netif_is_l3_master(dev) && dev->l3mdev_ops->l3mdev_get_rtable)
144 return dev->l3mdev_ops->l3mdev_get_rtable(dev, fl4);
145
146 return NULL;
147}
148
149static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
150{
151 struct net_device *dev;
152 bool rc = false;
153
154 if (ifindex == 0)
155 return false;
156
157 rcu_read_lock();
158
159 dev = dev_get_by_index_rcu(net, ifindex);
160 if (dev)
161 rc = netif_is_l3_master(dev);
162
163 rcu_read_unlock();
164
165 return rc;
166}
167
168int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4);
169
170struct dst_entry *l3mdev_get_rt6_dst(struct net *net, struct flowi6 *fl6);
171int l3mdev_get_saddr6(struct net *net, const struct sock *sk,
172 struct flowi6 *fl6);
173
174static inline
175struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto)
176{
177 struct net_device *master = NULL;
178
179 if (netif_is_l3_slave(skb->dev))
180 master = netdev_master_upper_dev_get_rcu(skb->dev);
181 else if (netif_is_l3_master(skb->dev))
182 master = skb->dev;
183
184 if (master && master->l3mdev_ops->l3mdev_l3_rcv)
185 skb = master->l3mdev_ops->l3mdev_l3_rcv(master, skb, proto);
186
187 return skb;
188}
189
190static inline
191struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
192{
193 return l3mdev_l3_rcv(skb, AF_INET);
194}
195
196static inline
197struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
198{
199 return l3mdev_l3_rcv(skb, AF_INET6);
200}
201
202#else
203
204static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
205{
206 return 0;
207}
208static inline int l3mdev_master_ifindex(struct net_device *dev)
209{
210 return 0;
211}
212
213static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
214{
215 return 0;
216}
217
218static inline
219const struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
220{
221 return NULL;
222}
223
224static inline int l3mdev_fib_oif_rcu(struct net_device *dev)
225{
226 return dev ? dev->ifindex : 0;
227}
228static inline int l3mdev_fib_oif(struct net_device *dev)
229{
230 return dev ? dev->ifindex : 0;
231}
232
233static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
234{
235 return 0;
236}
237static inline u32 l3mdev_fib_table(const struct net_device *dev)
238{
239 return 0;
240}
241static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
242{
243 return 0;
244}
245
246static inline struct rtable *l3mdev_get_rtable(const struct net_device *dev,
247 const struct flowi4 *fl4)
248{
249 return NULL;
250}
251
252static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
253{
254 return false;
255}
256
257static inline int l3mdev_get_saddr(struct net *net, int ifindex,
258 struct flowi4 *fl4)
259{
260 return 0;
261}
262
263static inline
264struct dst_entry *l3mdev_get_rt6_dst(struct net *net, struct flowi6 *fl6)
265{
266 return NULL;
267}
268
269static inline int l3mdev_get_saddr6(struct net *net, const struct sock *sk,
270 struct flowi6 *fl6)
271{
272 return 0;
273}
274
275static inline
276struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
277{
278 return skb;
279}
280
281static inline
282struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
283{
284 return skb;
285}
286
287static inline
288int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
289 struct fib_lookup_arg *arg)
290{
291 return 1;
292}
293#endif
294
295#endif /* _NET_L3MDEV_H_ */