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
25 struct 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
40 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
41 struct fib_lookup_arg *arg);
42
43 void l3mdev_update_flow(struct net *net, struct flowi *fl);
44
45 int l3mdev_master_ifindex_rcu(const struct net_device *dev);
l3mdev_master_ifindex(struct net_device * dev)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
l3mdev_master_ifindex_by_index(struct net * net,int ifindex)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
75 static inline
l3mdev_master_dev_rcu(const struct net_device * _dev)76 struct 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
100 int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex);
101 static inline
l3mdev_master_upper_ifindex_by_index(struct net * net,int ifindex)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
111 u32 l3mdev_fib_table_rcu(const struct net_device *dev);
112 u32 l3mdev_fib_table_by_index(struct net *net, int ifindex);
l3mdev_fib_table(const struct net_device * dev)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
netif_index_is_l3_master(struct net * net,int ifindex)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
143 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6);
144
145 static inline
l3mdev_l3_rcv(struct sk_buff * skb,u16 proto)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);
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
162 static inline
l3mdev_ip_rcv(struct sk_buff * skb)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
l3mdev_ip6_rcv(struct sk_buff * skb)169 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
170 {
171 return l3mdev_l3_rcv(skb, AF_INET6);
172 }
173
174 static inline
l3mdev_l3_out(struct sock * sk,struct sk_buff * skb,u16 proto)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
l3mdev_ip_out(struct sock * sk,struct sk_buff * skb)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
l3mdev_ip6_out(struct sock * sk,struct sk_buff * skb)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 }
202 #else
203
l3mdev_master_ifindex_rcu(const struct net_device * dev)204 static inline int l3mdev_master_ifindex_rcu(const struct net_device *dev)
205 {
206 return 0;
207 }
l3mdev_master_ifindex(struct net_device * dev)208 static inline int l3mdev_master_ifindex(struct net_device *dev)
209 {
210 return 0;
211 }
212
l3mdev_master_ifindex_by_index(struct net * net,int ifindex)213 static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
214 {
215 return 0;
216 }
217
218 static inline
l3mdev_master_upper_ifindex_by_index_rcu(struct net * net,int ifindex)219 int l3mdev_master_upper_ifindex_by_index_rcu(struct net *net, int ifindex)
220 {
221 return 0;
222 }
223 static inline
l3mdev_master_upper_ifindex_by_index(struct net * net,int ifindex)224 int l3mdev_master_upper_ifindex_by_index(struct net *net, int ifindex)
225 {
226 return 0;
227 }
228
229 static inline
l3mdev_master_dev_rcu(const struct net_device * dev)230 struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
231 {
232 return NULL;
233 }
234
l3mdev_fib_table_rcu(const struct net_device * dev)235 static inline u32 l3mdev_fib_table_rcu(const struct net_device *dev)
236 {
237 return 0;
238 }
l3mdev_fib_table(const struct net_device * dev)239 static inline u32 l3mdev_fib_table(const struct net_device *dev)
240 {
241 return 0;
242 }
l3mdev_fib_table_by_index(struct net * net,int ifindex)243 static inline u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
244 {
245 return 0;
246 }
247
netif_index_is_l3_master(struct net * net,int ifindex)248 static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
249 {
250 return false;
251 }
252
253 static inline
l3mdev_link_scope_lookup(struct net * net,struct flowi6 * fl6)254 struct dst_entry *l3mdev_link_scope_lookup(struct net *net, struct flowi6 *fl6)
255 {
256 return NULL;
257 }
258
259 static inline
l3mdev_ip_rcv(struct sk_buff * skb)260 struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
261 {
262 return skb;
263 }
264
265 static inline
l3mdev_ip6_rcv(struct sk_buff * skb)266 struct sk_buff *l3mdev_ip6_rcv(struct sk_buff *skb)
267 {
268 return skb;
269 }
270
271 static inline
l3mdev_ip_out(struct sock * sk,struct sk_buff * skb)272 struct sk_buff *l3mdev_ip_out(struct sock *sk, struct sk_buff *skb)
273 {
274 return skb;
275 }
276
277 static inline
l3mdev_ip6_out(struct sock * sk,struct sk_buff * skb)278 struct sk_buff *l3mdev_ip6_out(struct sock *sk, struct sk_buff *skb)
279 {
280 return skb;
281 }
282
283 static inline
l3mdev_fib_rule_match(struct net * net,struct flowi * fl,struct fib_lookup_arg * arg)284 int l3mdev_fib_rule_match(struct net *net, struct flowi *fl,
285 struct fib_lookup_arg *arg)
286 {
287 return 1;
288 }
289 static inline
l3mdev_update_flow(struct net * net,struct flowi * fl)290 void l3mdev_update_flow(struct net *net, struct flowi *fl)
291 {
292 }
293 #endif
294
295 #endif /* _NET_L3MDEV_H_ */
296