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1#ifndef __NET_FIB_RULES_H
2#define __NET_FIB_RULES_H
3
4#include <linux/types.h>
5#include <linux/slab.h>
6#include <linux/netdevice.h>
7#include <linux/fib_rules.h>
8#include <net/flow.h>
9#include <net/rtnetlink.h>
10
11struct fib_rule {
12 struct list_head list;
13 atomic_t refcnt;
14 int iifindex;
15 int oifindex;
16 u32 mark;
17 u32 mark_mask;
18 u32 pref;
19 u32 flags;
20 u32 table;
21 u8 action;
22 u32 target;
23 struct fib_rule __rcu *ctarget;
24 char iifname[IFNAMSIZ];
25 char oifname[IFNAMSIZ];
26 struct rcu_head rcu;
27 struct net * fr_net;
28};
29
30struct fib_lookup_arg {
31 void *lookup_ptr;
32 void *result;
33 struct fib_rule *rule;
34 int flags;
35#define FIB_LOOKUP_NOREF 1
36};
37
38struct fib_rules_ops {
39 int family;
40 struct list_head list;
41 int rule_size;
42 int addr_size;
43 int unresolved_rules;
44 int nr_goto_rules;
45
46 int (*action)(struct fib_rule *,
47 struct flowi *, int,
48 struct fib_lookup_arg *);
49 int (*match)(struct fib_rule *,
50 struct flowi *, int);
51 int (*configure)(struct fib_rule *,
52 struct sk_buff *,
53 struct fib_rule_hdr *,
54 struct nlattr **);
55 int (*compare)(struct fib_rule *,
56 struct fib_rule_hdr *,
57 struct nlattr **);
58 int (*fill)(struct fib_rule *, struct sk_buff *,
59 struct fib_rule_hdr *);
60 u32 (*default_pref)(struct fib_rules_ops *ops);
61 size_t (*nlmsg_payload)(struct fib_rule *);
62
63 /* Called after modifications to the rules set, must flush
64 * the route cache if one exists. */
65 void (*flush_cache)(struct fib_rules_ops *ops);
66
67 int nlgroup;
68 const struct nla_policy *policy;
69 struct list_head rules_list;
70 struct module *owner;
71 struct net *fro_net;
72 struct rcu_head rcu;
73};
74
75#define FRA_GENERIC_POLICY \
76 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
77 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
78 [FRA_PRIORITY] = { .type = NLA_U32 }, \
79 [FRA_FWMARK] = { .type = NLA_U32 }, \
80 [FRA_FWMASK] = { .type = NLA_U32 }, \
81 [FRA_TABLE] = { .type = NLA_U32 }, \
82 [FRA_GOTO] = { .type = NLA_U32 }
83
84static inline void fib_rule_get(struct fib_rule *rule)
85{
86 atomic_inc(&rule->refcnt);
87}
88
89static inline void fib_rule_put_rcu(struct rcu_head *head)
90{
91 struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
92 release_net(rule->fr_net);
93 kfree(rule);
94}
95
96static inline void fib_rule_put(struct fib_rule *rule)
97{
98 if (atomic_dec_and_test(&rule->refcnt))
99 call_rcu(&rule->rcu, fib_rule_put_rcu);
100}
101
102static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
103{
104 if (nla[FRA_TABLE])
105 return nla_get_u32(nla[FRA_TABLE]);
106 return frh->table;
107}
108
109extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
110extern void fib_rules_unregister(struct fib_rules_ops *);
111
112extern int fib_rules_lookup(struct fib_rules_ops *,
113 struct flowi *, int flags,
114 struct fib_lookup_arg *);
115extern int fib_default_rule_add(struct fib_rules_ops *,
116 u32 pref, u32 table,
117 u32 flags);
118extern u32 fib_default_rule_pref(struct fib_rules_ops *ops);
119#endif
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 *, 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
100struct fib_rule_notifier_info {
101 struct fib_notifier_info info; /* must be first */
102 struct fib_rule *rule;
103};
104
105static inline void fib_rule_get(struct fib_rule *rule)
106{
107 refcount_inc(&rule->refcnt);
108}
109
110static 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
117static 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
123static 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
130static 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
137static 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
142static 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
149static 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
155static 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
162static 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
169struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
170 struct net *);
171void fib_rules_unregister(struct fib_rules_ops *);
172
173int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
174 struct fib_lookup_arg *);
175int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
176 u32 flags);
177bool fib_rule_matchall(const struct fib_rule *rule);
178int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
179 struct netlink_ext_ack *extack);
180unsigned int fib_rules_seq_read(struct net *net, int family);
181
182int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
183 struct netlink_ext_ack *extack);
184int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
185 struct netlink_ext_ack *extack);
186
187INDIRECT_CALLABLE_DECLARE(int fib6_rule_match(struct fib_rule *rule,
188 struct flowi *fl, int flags));
189INDIRECT_CALLABLE_DECLARE(int fib4_rule_match(struct fib_rule *rule,
190 struct flowi *fl, int flags));
191
192INDIRECT_CALLABLE_DECLARE(int fib6_rule_action(struct fib_rule *rule,
193 struct flowi *flp, int flags,
194 struct fib_lookup_arg *arg));
195INDIRECT_CALLABLE_DECLARE(int fib4_rule_action(struct fib_rule *rule,
196 struct flowi *flp, int flags,
197 struct fib_lookup_arg *arg));
198
199INDIRECT_CALLABLE_DECLARE(bool fib6_rule_suppress(struct fib_rule *rule,
200 int flags,
201 struct fib_lookup_arg *arg));
202INDIRECT_CALLABLE_DECLARE(bool fib4_rule_suppress(struct fib_rule *rule,
203 int flags,
204 struct fib_lookup_arg *arg));
205#endif