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
14 struct fib_kuid_range {
15 kuid_t start;
16 kuid_t end;
17 };
18
19 struct fib_rule {
20 struct list_head list;
21 int iifindex;
22 int oifindex;
23 u32 mark;
24 u32 mark_mask;
25 u32 flags;
26 u32 table;
27 u8 action;
28 u8 l3mdev;
29 /* 2 bytes hole, try to use */
30 u32 target;
31 __be64 tun_id;
32 struct fib_rule __rcu *ctarget;
33 struct net *fr_net;
34
35 refcount_t refcnt;
36 u32 pref;
37 int suppress_ifgroup;
38 int suppress_prefixlen;
39 char iifname[IFNAMSIZ];
40 char oifname[IFNAMSIZ];
41 struct fib_kuid_range uid_range;
42 struct rcu_head rcu;
43 };
44
45 struct fib_lookup_arg {
46 void *lookup_ptr;
47 void *result;
48 struct fib_rule *rule;
49 u32 table;
50 int flags;
51 #define FIB_LOOKUP_NOREF 1
52 #define FIB_LOOKUP_IGNORE_LINKSTATE 2
53 };
54
55 struct fib_rules_ops {
56 int family;
57 struct list_head list;
58 int rule_size;
59 int addr_size;
60 int unresolved_rules;
61 int nr_goto_rules;
62 unsigned int fib_rules_seq;
63
64 int (*action)(struct fib_rule *,
65 struct flowi *, int,
66 struct fib_lookup_arg *);
67 bool (*suppress)(struct fib_rule *,
68 struct fib_lookup_arg *);
69 int (*match)(struct fib_rule *,
70 struct flowi *, int);
71 int (*configure)(struct fib_rule *,
72 struct sk_buff *,
73 struct fib_rule_hdr *,
74 struct nlattr **);
75 int (*delete)(struct fib_rule *);
76 int (*compare)(struct fib_rule *,
77 struct fib_rule_hdr *,
78 struct nlattr **);
79 int (*fill)(struct fib_rule *, struct sk_buff *,
80 struct fib_rule_hdr *);
81 size_t (*nlmsg_payload)(struct fib_rule *);
82
83 /* Called after modifications to the rules set, must flush
84 * the route cache if one exists. */
85 void (*flush_cache)(struct fib_rules_ops *ops);
86
87 int nlgroup;
88 const struct nla_policy *policy;
89 struct list_head rules_list;
90 struct module *owner;
91 struct net *fro_net;
92 struct rcu_head rcu;
93 };
94
95 struct fib_rule_notifier_info {
96 struct fib_notifier_info info; /* must be first */
97 struct fib_rule *rule;
98 };
99
100 #define FRA_GENERIC_POLICY \
101 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
102 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
103 [FRA_PRIORITY] = { .type = NLA_U32 }, \
104 [FRA_FWMARK] = { .type = NLA_U32 }, \
105 [FRA_TUN_ID] = { .type = NLA_U64 }, \
106 [FRA_FWMASK] = { .type = NLA_U32 }, \
107 [FRA_TABLE] = { .type = NLA_U32 }, \
108 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
109 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
110 [FRA_GOTO] = { .type = NLA_U32 }, \
111 [FRA_L3MDEV] = { .type = NLA_U8 }, \
112 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }
113
fib_rule_get(struct fib_rule * rule)114 static inline void fib_rule_get(struct fib_rule *rule)
115 {
116 refcount_inc(&rule->refcnt);
117 }
118
fib_rule_put(struct fib_rule * rule)119 static inline void fib_rule_put(struct fib_rule *rule)
120 {
121 if (refcount_dec_and_test(&rule->refcnt))
122 kfree_rcu(rule, rcu);
123 }
124
125 #ifdef CONFIG_NET_L3_MASTER_DEV
fib_rule_get_table(struct fib_rule * rule,struct fib_lookup_arg * arg)126 static inline u32 fib_rule_get_table(struct fib_rule *rule,
127 struct fib_lookup_arg *arg)
128 {
129 return rule->l3mdev ? arg->table : rule->table;
130 }
131 #else
fib_rule_get_table(struct fib_rule * rule,struct fib_lookup_arg * arg)132 static inline u32 fib_rule_get_table(struct fib_rule *rule,
133 struct fib_lookup_arg *arg)
134 {
135 return rule->table;
136 }
137 #endif
138
frh_get_table(struct fib_rule_hdr * frh,struct nlattr ** nla)139 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
140 {
141 if (nla[FRA_TABLE])
142 return nla_get_u32(nla[FRA_TABLE]);
143 return frh->table;
144 }
145
146 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
147 struct net *);
148 void fib_rules_unregister(struct fib_rules_ops *);
149
150 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
151 struct fib_lookup_arg *);
152 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
153 u32 flags);
154 bool fib_rule_matchall(const struct fib_rule *rule);
155 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family);
156 unsigned int fib_rules_seq_read(struct net *net, int family);
157
158 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
159 struct netlink_ext_ack *extack);
160 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
161 struct netlink_ext_ack *extack);
162 #endif
163