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
11 struct fib_kuid_range {
12 kuid_t start;
13 kuid_t end;
14 };
15
16 struct fib_rule {
17 struct list_head list;
18 int iifindex;
19 int oifindex;
20 u32 mark;
21 u32 mark_mask;
22 u32 flags;
23 u32 table;
24 u8 action;
25 /* 3 bytes hole, try to use */
26 u32 target;
27 struct fib_rule __rcu *ctarget;
28 struct net *fr_net;
29
30 atomic_t refcnt;
31 u32 pref;
32 int suppress_ifgroup;
33 int suppress_prefixlen;
34 char iifname[IFNAMSIZ];
35 char oifname[IFNAMSIZ];
36 struct fib_kuid_range uid_range;
37 struct rcu_head rcu;
38 };
39
40 struct fib_lookup_arg {
41 void *lookup_ptr;
42 void *result;
43 struct fib_rule *rule;
44 int flags;
45 #define FIB_LOOKUP_NOREF 1
46 };
47
48 struct fib_rules_ops {
49 int family;
50 struct list_head list;
51 int rule_size;
52 int addr_size;
53 int unresolved_rules;
54 int nr_goto_rules;
55
56 int (*action)(struct fib_rule *,
57 struct flowi *, int,
58 struct fib_lookup_arg *);
59 bool (*suppress)(struct fib_rule *,
60 struct fib_lookup_arg *);
61 int (*match)(struct fib_rule *,
62 struct flowi *, int);
63 int (*configure)(struct fib_rule *,
64 struct sk_buff *,
65 struct fib_rule_hdr *,
66 struct nlattr **);
67 void (*delete)(struct fib_rule *);
68 int (*compare)(struct fib_rule *,
69 struct fib_rule_hdr *,
70 struct nlattr **);
71 int (*fill)(struct fib_rule *, struct sk_buff *,
72 struct fib_rule_hdr *);
73 u32 (*default_pref)(struct fib_rules_ops *ops);
74 size_t (*nlmsg_payload)(struct fib_rule *);
75
76 /* Called after modifications to the rules set, must flush
77 * the route cache if one exists. */
78 void (*flush_cache)(struct fib_rules_ops *ops);
79
80 int nlgroup;
81 const struct nla_policy *policy;
82 struct list_head rules_list;
83 struct module *owner;
84 struct net *fro_net;
85 struct rcu_head rcu;
86 };
87
88 #define FRA_GENERIC_POLICY \
89 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
90 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
91 [FRA_PRIORITY] = { .type = NLA_U32 }, \
92 [FRA_FWMARK] = { .type = NLA_U32 }, \
93 [FRA_FWMASK] = { .type = NLA_U32 }, \
94 [FRA_TABLE] = { .type = NLA_U32 }, \
95 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
96 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
97 [FRA_GOTO] = { .type = NLA_U32 }, \
98 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }
99
fib_rule_get(struct fib_rule * rule)100 static inline void fib_rule_get(struct fib_rule *rule)
101 {
102 atomic_inc(&rule->refcnt);
103 }
104
fib_rule_put_rcu(struct rcu_head * head)105 static inline void fib_rule_put_rcu(struct rcu_head *head)
106 {
107 struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
108 release_net(rule->fr_net);
109 kfree(rule);
110 }
111
fib_rule_put(struct fib_rule * rule)112 static inline void fib_rule_put(struct fib_rule *rule)
113 {
114 if (atomic_dec_and_test(&rule->refcnt))
115 call_rcu(&rule->rcu, fib_rule_put_rcu);
116 }
117
frh_get_table(struct fib_rule_hdr * frh,struct nlattr ** nla)118 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
119 {
120 if (nla[FRA_TABLE])
121 return nla_get_u32(nla[FRA_TABLE]);
122 return frh->table;
123 }
124
125 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
126 struct net *);
127 void fib_rules_unregister(struct fib_rules_ops *);
128
129 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
130 struct fib_lookup_arg *);
131 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
132 u32 flags);
133 u32 fib_default_rule_pref(struct fib_rules_ops *ops);
134 #endif
135