1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_FIB_RULES_H
3 #define __NET_FIB_RULES_H
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>
11 #include <net/rtnetlink.h>
12 #include <net/fib_notifier.h>
13 #include <linux/indirect_call_wrapper.h>
15 struct fib_kuid_range {
21 struct list_head list;
34 struct fib_rule __rcu *ctarget;
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;
49 struct fib_lookup_arg {
51 const void *lookup_data;
53 struct fib_rule *rule;
56 #define FIB_LOOKUP_NOREF 1
57 #define FIB_LOOKUP_IGNORE_LINKSTATE 2
60 struct fib_rules_ops {
62 struct list_head list;
67 unsigned int fib_rules_seq;
69 int (*action)(struct fib_rule *,
71 struct fib_lookup_arg *);
72 bool (*suppress)(struct fib_rule *, int,
73 struct fib_lookup_arg *);
74 int (*match)(struct fib_rule *,
76 int (*configure)(struct fib_rule *,
78 struct fib_rule_hdr *,
80 struct netlink_ext_ack *);
81 int (*delete)(struct fib_rule *);
82 int (*compare)(struct fib_rule *,
83 struct fib_rule_hdr *,
85 int (*fill)(struct fib_rule *, struct sk_buff *,
86 struct fib_rule_hdr *);
87 size_t (*nlmsg_payload)(struct fib_rule *);
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);
94 struct list_head rules_list;
100 struct fib_rule_notifier_info {
101 struct fib_notifier_info info; /* must be first */
102 struct fib_rule *rule;
105 static inline void fib_rule_get(struct fib_rule *rule)
107 refcount_inc(&rule->refcnt);
110 static inline void fib_rule_put(struct fib_rule *rule)
112 if (refcount_dec_and_test(&rule->refcnt))
113 kfree_rcu(rule, rcu);
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)
120 return rule->l3mdev ? arg->table : rule->table;
123 static inline u32 fib_rule_get_table(struct fib_rule *rule,
124 struct fib_lookup_arg *arg)
130 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
133 return nla_get_u32(nla[FRA_TABLE]);
137 static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
139 return range->start != 0 && range->end != 0;
142 static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,
145 return ntohs(port) >= a->start &&
146 ntohs(port) <= a->end;
149 static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)
151 return a->start != 0 && a->end != 0 && a->end < 0xffff &&
155 static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,
156 struct fib_rule_port_range *b)
158 return a->start == b->start &&
162 static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)
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));
169 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
171 void fib_rules_unregister(struct fib_rules_ops *);
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,
177 bool fib_rule_matchall(const struct fib_rule *rule);
178 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
179 struct netlink_ext_ack *extack);
180 unsigned int fib_rules_seq_read(struct net *net, int family);
182 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
183 struct netlink_ext_ack *extack);
184 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
185 struct netlink_ext_ack *extack);
187 INDIRECT_CALLABLE_DECLARE(int fib6_rule_match(struct fib_rule *rule,
188 struct flowi *fl, int flags));
189 INDIRECT_CALLABLE_DECLARE(int fib4_rule_match(struct fib_rule *rule,
190 struct flowi *fl, int flags));
192 INDIRECT_CALLABLE_DECLARE(int fib6_rule_action(struct fib_rule *rule,
193 struct flowi *flp, int flags,
194 struct fib_lookup_arg *arg));
195 INDIRECT_CALLABLE_DECLARE(int fib4_rule_action(struct fib_rule *rule,
196 struct flowi *flp, int flags,
197 struct fib_lookup_arg *arg));
199 INDIRECT_CALLABLE_DECLARE(bool fib6_rule_suppress(struct fib_rule *rule,
201 struct fib_lookup_arg *arg));
202 INDIRECT_CALLABLE_DECLARE(bool fib4_rule_suppress(struct fib_rule *rule,
204 struct fib_lookup_arg *arg));