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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __NET_FIB_RULES_H
3#define __NET_FIB_RULES_H
4
5#include <linux/types.h>
6#include <linux/slab.h>
7#include <linux/netdevice.h>
8#include <linux/fib_rules.h>
9#include <linux/refcount.h>
10#include <net/flow.h>
11#include <net/rtnetlink.h>
12#include <net/fib_notifier.h>
13#include <linux/indirect_call_wrapper.h>
14
15struct fib_kuid_range {
16 kuid_t start;
17 kuid_t end;
18};
19
20struct fib_rule {
21 struct list_head list;
22 int iifindex;
23 int oifindex;
24 u32 mark;
25 u32 mark_mask;
26 u32 flags;
27 u32 table;
28 u8 action;
29 u8 l3mdev;
30 u8 proto;
31 u8 ip_proto;
32 u32 target;
33 __be64 tun_id;
34 struct fib_rule __rcu *ctarget;
35 struct net *fr_net;
36
37 refcount_t refcnt;
38 u32 pref;
39 int suppress_ifgroup;
40 int suppress_prefixlen;
41 char iifname[IFNAMSIZ];
42 char oifname[IFNAMSIZ];
43 struct fib_kuid_range uid_range;
44 struct fib_rule_port_range sport_range;
45 struct fib_rule_port_range dport_range;
46 u16 sport_mask;
47 u16 dport_mask;
48 u8 iif_is_l3_master;
49 u8 oif_is_l3_master;
50 struct rcu_head rcu;
51};
52
53struct fib_lookup_arg {
54 void *lookup_ptr;
55 const void *lookup_data;
56 void *result;
57 struct fib_rule *rule;
58 u32 table;
59 int flags;
60#define FIB_LOOKUP_NOREF 1
61#define FIB_LOOKUP_IGNORE_LINKSTATE 2
62};
63
64struct fib_rules_ops {
65 int family;
66 struct list_head list;
67 int rule_size;
68 int addr_size;
69 int unresolved_rules;
70 int nr_goto_rules;
71 unsigned int fib_rules_seq;
72
73 int (*action)(struct fib_rule *,
74 struct flowi *, int,
75 struct fib_lookup_arg *);
76 bool (*suppress)(struct fib_rule *, int,
77 struct fib_lookup_arg *);
78 int (*match)(struct fib_rule *,
79 struct flowi *, int);
80 int (*configure)(struct fib_rule *,
81 struct sk_buff *,
82 struct fib_rule_hdr *,
83 struct nlattr **,
84 struct netlink_ext_ack *);
85 void (*delete)(struct fib_rule *);
86 int (*compare)(struct fib_rule *,
87 struct fib_rule_hdr *,
88 struct nlattr **);
89 int (*fill)(struct fib_rule *, struct sk_buff *,
90 struct fib_rule_hdr *);
91 size_t (*nlmsg_payload)(struct fib_rule *);
92
93 /* Called after modifications to the rules set, must flush
94 * the route cache if one exists. */
95 void (*flush_cache)(struct fib_rules_ops *ops);
96 bool (*need_rtnl)(struct net *net);
97
98 int nlgroup;
99 struct list_head rules_list;
100 struct module *owner;
101 struct net *fro_net;
102 struct mutex lock;
103 struct rcu_head rcu;
104};
105
106struct fib_rule_notifier_info {
107 struct fib_notifier_info info; /* must be first */
108 struct fib_rule *rule;
109};
110
111static inline void fib_rule_get(struct fib_rule *rule)
112{
113 refcount_inc(&rule->refcnt);
114}
115
116static inline bool fib_rule_get_safe(struct fib_rule *rule)
117{
118 return refcount_inc_not_zero(&rule->refcnt);
119}
120
121static inline void fib_rule_put(struct fib_rule *rule)
122{
123 if (refcount_dec_and_test(&rule->refcnt))
124 kfree_rcu(rule, rcu);
125}
126
127#ifdef CONFIG_NET_L3_MASTER_DEV
128static inline u32 fib_rule_get_table(struct fib_rule *rule,
129 struct fib_lookup_arg *arg)
130{
131 return rule->l3mdev ? arg->table : rule->table;
132}
133#else
134static inline u32 fib_rule_get_table(struct fib_rule *rule,
135 struct fib_lookup_arg *arg)
136{
137 return rule->table;
138}
139#endif
140
141static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
142{
143 if (nla[FRA_TABLE])
144 return nla_get_u32(nla[FRA_TABLE]);
145 return frh->table;
146}
147
148static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
149{
150 return range->start != 0 && range->end != 0;
151}
152
153static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,
154 __be16 port)
155{
156 return ntohs(port) >= a->start &&
157 ntohs(port) <= a->end;
158}
159
160static inline bool fib_rule_port_match(const struct fib_rule_port_range *range,
161 u16 port_mask, __be16 port)
162{
163 if ((range->start ^ ntohs(port)) & port_mask)
164 return false;
165 if (!port_mask && fib_rule_port_range_set(range) &&
166 !fib_rule_port_inrange(range, port))
167 return false;
168 return true;
169}
170
171static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)
172{
173 return a->start != 0 && a->end != 0 && a->end < 0xffff &&
174 a->start <= a->end;
175}
176
177static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,
178 struct fib_rule_port_range *b)
179{
180 return a->start == b->start &&
181 a->end == b->end;
182}
183
184static inline bool
185fib_rule_port_is_range(const struct fib_rule_port_range *range)
186{
187 return range->start != range->end;
188}
189
190static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)
191{
192 return rule->iifindex != LOOPBACK_IFINDEX && (rule->ip_proto ||
193 fib_rule_port_range_set(&rule->sport_range) ||
194 fib_rule_port_range_set(&rule->dport_range));
195}
196
197struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
198 struct net *);
199void fib_rules_unregister(struct fib_rules_ops *);
200
201int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
202 struct fib_lookup_arg *);
203int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table);
204bool fib_rule_matchall(const struct fib_rule *rule);
205int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
206 struct netlink_ext_ack *extack);
207unsigned int fib_rules_seq_read(const struct net *net, int family);
208
209int fib_newrule(struct net *net, struct sk_buff *skb, struct nlmsghdr *nlh,
210 struct netlink_ext_ack *extack, bool rtnl_held);
211int fib_delrule(struct net *net, struct sk_buff *skb, struct nlmsghdr *nlh,
212 struct netlink_ext_ack *extack, bool rtnl_held);
213
214INDIRECT_CALLABLE_DECLARE(int fib6_rule_match(struct fib_rule *rule,
215 struct flowi *fl, int flags));
216INDIRECT_CALLABLE_DECLARE(int fib4_rule_match(struct fib_rule *rule,
217 struct flowi *fl, int flags));
218
219INDIRECT_CALLABLE_DECLARE(int fib6_rule_action(struct fib_rule *rule,
220 struct flowi *flp, int flags,
221 struct fib_lookup_arg *arg));
222INDIRECT_CALLABLE_DECLARE(int fib4_rule_action(struct fib_rule *rule,
223 struct flowi *flp, int flags,
224 struct fib_lookup_arg *arg));
225
226INDIRECT_CALLABLE_DECLARE(bool fib6_rule_suppress(struct fib_rule *rule,
227 int flags,
228 struct fib_lookup_arg *arg));
229INDIRECT_CALLABLE_DECLARE(bool fib4_rule_suppress(struct fib_rule *rule,
230 int flags,
231 struct fib_lookup_arg *arg));
232#endif