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