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
15 struct fib_kuid_range {
16 kuid_t start;
17 kuid_t end;
18 };
19
20 struct 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 struct rcu_head rcu;
47 };
48
49 struct fib_lookup_arg {
50 void *lookup_ptr;
51 const void *lookup_data;
52 void *result;
53 struct fib_rule *rule;
54 u32 table;
55 int flags;
56 #define FIB_LOOKUP_NOREF 1
57 #define FIB_LOOKUP_IGNORE_LINKSTATE 2
58 };
59
60 struct fib_rules_ops {
61 int family;
62 struct list_head list;
63 int rule_size;
64 int addr_size;
65 int unresolved_rules;
66 int nr_goto_rules;
67 unsigned int fib_rules_seq;
68
69 int (*action)(struct fib_rule *,
70 struct flowi *, int,
71 struct fib_lookup_arg *);
72 bool (*suppress)(struct fib_rule *, int,
73 struct fib_lookup_arg *);
74 int (*match)(struct fib_rule *,
75 struct flowi *, int);
76 int (*configure)(struct fib_rule *,
77 struct sk_buff *,
78 struct fib_rule_hdr *,
79 struct nlattr **,
80 struct netlink_ext_ack *);
81 int (*delete)(struct fib_rule *);
82 int (*compare)(struct fib_rule *,
83 struct fib_rule_hdr *,
84 struct nlattr **);
85 int (*fill)(struct fib_rule *, struct sk_buff *,
86 struct fib_rule_hdr *);
87 size_t (*nlmsg_payload)(struct fib_rule *);
88
89 /* Called after modifications to the rules set, must flush
90 * the route cache if one exists. */
91 void (*flush_cache)(struct fib_rules_ops *ops);
92
93 int nlgroup;
94 struct list_head rules_list;
95 struct module *owner;
96 struct net *fro_net;
97 struct rcu_head rcu;
98 };
99
100 struct fib_rule_notifier_info {
101 struct fib_notifier_info info; /* must be first */
102 struct fib_rule *rule;
103 };
104
105 static inline void fib_rule_get(struct fib_rule *rule)
106 {
107 refcount_inc(&rule->refcnt);
108 }
109
110 static inline void fib_rule_put(struct fib_rule *rule)
111 {
112 if (refcount_dec_and_test(&rule->refcnt))
113 kfree_rcu(rule, rcu);
114 }
115
116 #ifdef CONFIG_NET_L3_MASTER_DEV
117 static inline u32 fib_rule_get_table(struct fib_rule *rule,
118 struct fib_lookup_arg *arg)
119 {
120 return rule->l3mdev ? arg->table : rule->table;
121 }
122 #else
123 static inline u32 fib_rule_get_table(struct fib_rule *rule,
124 struct fib_lookup_arg *arg)
125 {
126 return rule->table;
127 }
128 #endif
129
130 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
131 {
132 if (nla[FRA_TABLE])
133 return nla_get_u32(nla[FRA_TABLE]);
134 return frh->table;
135 }
136
137 static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
138 {
139 return range->start != 0 && range->end != 0;
140 }
141
142 static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,
143 __be16 port)
144 {
145 return ntohs(port) >= a->start &&
146 ntohs(port) <= a->end;
147 }
148
149 static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)
150 {
151 return a->start != 0 && a->end != 0 && a->end < 0xffff &&
152 a->start <= a->end;
153 }
154
155 static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,
156 struct fib_rule_port_range *b)
157 {
158 return a->start == b->start &&
159 a->end == b->end;
160 }
161
162 static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)
163 {
164 return rule->iifindex != LOOPBACK_IFINDEX && (rule->ip_proto ||
165 fib_rule_port_range_set(&rule->sport_range) ||
166 fib_rule_port_range_set(&rule->dport_range));
167 }
168
169 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
170 struct net *);
171 void fib_rules_unregister(struct fib_rules_ops *);
172
173 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
174 struct fib_lookup_arg *);
175 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table);
176 bool fib_rule_matchall(const struct fib_rule *rule);
177 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
178 struct netlink_ext_ack *extack);
179 unsigned int fib_rules_seq_read(struct net *net, int family);
180
181 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
182 struct netlink_ext_ack *extack);
183 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
184 struct netlink_ext_ack *extack);
185
186 INDIRECT_CALLABLE_DECLARE(int fib6_rule_match(struct fib_rule *rule,
187 struct flowi *fl, int flags));
188 INDIRECT_CALLABLE_DECLARE(int fib4_rule_match(struct fib_rule *rule,
189 struct flowi *fl, int flags));
190
191 INDIRECT_CALLABLE_DECLARE(int fib6_rule_action(struct fib_rule *rule,
192 struct flowi *flp, int flags,
193 struct fib_lookup_arg *arg));
194 INDIRECT_CALLABLE_DECLARE(int fib4_rule_action(struct fib_rule *rule,
195 struct flowi *flp, int flags,
196 struct fib_lookup_arg *arg));
197
198 INDIRECT_CALLABLE_DECLARE(bool fib6_rule_suppress(struct fib_rule *rule,
199 int flags,
200 struct fib_lookup_arg *arg));
201 INDIRECT_CALLABLE_DECLARE(bool fib4_rule_suppress(struct fib_rule *rule,
202 int flags,
203 struct fib_lookup_arg *arg));
204 #endif
205
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