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1/* SPDX-License-Identifier: GPL-2.0-or-later */
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>
6 */
7#ifndef _NET_L3MDEV_H_
8#define _NET_L3MDEV_H_
9
10#include <net/dst.h>
11#include <net/fib_rules.h>
12
13/**
14 * struct l3mdev_ops - l3mdev operations
15 *
16 * @l3mdev_fib_table: Get FIB table id to use for lookups
17 *
18 * @l3mdev_l3_rcv: Hook in L3 receive path
19 *
20 * @l3mdev_l3_out: Hook in L3 output path
21 *
22 * @l3mdev_link_scope_lookup: IPv6 lookup for linklocal and mcast destinations
23 */
24
25struct l3mdev_ops {
26 u32 (*l3mdev_fib_table)(const struct net_device *dev);
27 struct sk_buff * (*l3mdev_l3_rcv)(struct net_device *dev,
28 struct sk_buff *skb, u16 proto);
29 struct sk_buff * (*l3mdev_l3_out)(struct net_device *dev,
30 struct sock *sk, struct sk_buff *skb,
31 u16 proto);
32
33 /* IPv6 ops */
34 struct dst_entry * (*l3mdev_link_scope_lookup)(const struct net_device *dev,
35 struct flowi6 *fl6);
36};
37
38#ifdef CONFIG_NET_L3_MASTER_DEV
39
40int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
41 struct fib_lookup_arg *arg);
42
43void l3mdev_update_flow(struct net *net, struct flowi *fl);
44
45int l3mdev_master_ifindex_rcu(const struct net_device *dev);
46static 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
57static 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
75static inline
76struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
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;
85 struct net_device *master;
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
100int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex);
101static inline
102int 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
111u32 l3mdev_fib_table_rcu(const struct net_device *dev);
112u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
113static 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
124static 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
143struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6);
144
145static inline
146struct 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);
152 else if (netif_is_l3_master(skb->dev) ||
153 netif_has_l3_rx_handler(skb->dev))
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
162static inline
163struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
164{
165 return l3mdev_l3_rcv(skb, AF_INET);
166}
167
168static inline
169struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
170{
171 return l3mdev_l3_rcv(skb, AF_INET6);
172}
173
174static inline
175struct 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
191static inline
192struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
193{
194 return l3mdev_l3_out(sk, skb, AF_INET);
195}
196
197static inline
198struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
199{
200 return l3mdev_l3_out(sk, skb, AF_INET6);
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
219int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
220{
221 return 0;
222}
223static inline
224int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex)
225{
226 return 0;
227}
228
229static inline
230struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
231{
232 return NULL;
233}
234
235static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
236{
237 return 0;
238}
239static inline u32 l3mdev_fib_table(const struct net_device *dev)
240{
241 return 0;
242}
243static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
244{
245 return 0;
246}
247
248static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
249{
250 return false;
251}
252
253static inline
254struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6)
255{
256 return NULL;
257}
258
259static inline
260struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
261{
262 return skb;
263}
264
265static inline
266struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
267{
268 return skb;
269}
270
271static inline
272struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
273{
274 return skb;
275}
276
277static inline
278struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
279{
280 return skb;
281}
282
283static inline
284int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
285 struct fib_lookup_arg *arg)
286{
287 return 1;
288}
289static inline
290void l3mdev_update_flow(struct net *net, struct flowi *fl)
291{
292}
293#endif
294
295#endif /* _NET_L3MDEV_H_ */