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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 struct rcu_head rcu;
47};
48
49struct 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
60struct 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 *,
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 const struct nla_policy *policy;
95 struct list_head rules_list;
96 struct module *owner;
97 struct net *fro_net;
98 struct rcu_head rcu;
99};
100
101struct fib_rule_notifier_info {
102 struct fib_notifier_info info; /* must be first */
103 struct fib_rule *rule;
104};
105
106#define FRA_GENERIC_POLICY \
107 [FRA_UNSPEC] = { .strict_start_type = FRA_DPORT_RANGE + 1 }, \
108 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
109 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
110 [FRA_PRIORITY] = { .type = NLA_U32 }, \
111 [FRA_FWMARK] = { .type = NLA_U32 }, \
112 [FRA_TUN_ID] = { .type = NLA_U64 }, \
113 [FRA_FWMASK] = { .type = NLA_U32 }, \
114 [FRA_TABLE] = { .type = NLA_U32 }, \
115 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
116 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
117 [FRA_GOTO] = { .type = NLA_U32 }, \
118 [FRA_L3MDEV] = { .type = NLA_U8 }, \
119 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }, \
120 [FRA_PROTOCOL] = { .type = NLA_U8 }, \
121 [FRA_IP_PROTO] = { .type = NLA_U8 }, \
122 [FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }, \
123 [FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }
124
125
126static inline void fib_rule_get(struct fib_rule *rule)
127{
128 refcount_inc(&rule->refcnt);
129}
130
131static inline void fib_rule_put(struct fib_rule *rule)
132{
133 if (refcount_dec_and_test(&rule->refcnt))
134 kfree_rcu(rule, rcu);
135}
136
137#ifdef CONFIG_NET_L3_MASTER_DEV
138static inline u32 fib_rule_get_table(struct fib_rule *rule,
139 struct fib_lookup_arg *arg)
140{
141 return rule->l3mdev ? arg->table : rule->table;
142}
143#else
144static inline u32 fib_rule_get_table(struct fib_rule *rule,
145 struct fib_lookup_arg *arg)
146{
147 return rule->table;
148}
149#endif
150
151static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
152{
153 if (nla[FRA_TABLE])
154 return nla_get_u32(nla[FRA_TABLE]);
155 return frh->table;
156}
157
158static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
159{
160 return range->start != 0 && range->end != 0;
161}
162
163static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,
164 __be16 port)
165{
166 return ntohs(port) >= a->start &&
167 ntohs(port) <= a->end;
168}
169
170static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)
171{
172 return a->start != 0 && a->end != 0 && a->end < 0xffff &&
173 a->start <= a->end;
174}
175
176static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,
177 struct fib_rule_port_range *b)
178{
179 return a->start == b->start &&
180 a->end == b->end;
181}
182
183static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)
184{
185 return rule->iifindex != LOOPBACK_IFINDEX && (rule->ip_proto ||
186 fib_rule_port_range_set(&rule->sport_range) ||
187 fib_rule_port_range_set(&rule->dport_range));
188}
189
190struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
191 struct net *);
192void fib_rules_unregister(struct fib_rules_ops *);
193
194int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
195 struct fib_lookup_arg *);
196int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
197 u32 flags);
198bool fib_rule_matchall(const struct fib_rule *rule);
199int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
200 struct netlink_ext_ack *extack);
201unsigned int fib_rules_seq_read(struct net *net, int family);
202
203int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
204 struct netlink_ext_ack *extack);
205int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
206 struct netlink_ext_ack *extack);
207
208INDIRECT_CALLABLE_DECLARE(int fib6_rule_match(struct fib_rule *rule,
209 struct flowi *fl, int flags));
210INDIRECT_CALLABLE_DECLARE(int fib4_rule_match(struct fib_rule *rule,
211 struct flowi *fl, int flags));
212
213INDIRECT_CALLABLE_DECLARE(int fib6_rule_action(struct fib_rule *rule,
214 struct flowi *flp, int flags,
215 struct fib_lookup_arg *arg));
216INDIRECT_CALLABLE_DECLARE(int fib4_rule_action(struct fib_rule *rule,
217 struct flowi *flp, int flags,
218 struct fib_lookup_arg *arg));
219
220INDIRECT_CALLABLE_DECLARE(bool fib6_rule_suppress(struct fib_rule *rule,
221 struct fib_lookup_arg *arg));
222INDIRECT_CALLABLE_DECLARE(bool fib4_rule_suppress(struct fib_rule *rule,
223 struct fib_lookup_arg *arg));
224#endif