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Thomas Graf14c0b972006-08-04 03:38:38 -07001#ifndef __NET_FIB_RULES_H
2#define __NET_FIB_RULES_H
3
4#include <linux/types.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09005#include <linux/slab.h>
Thomas Graf14c0b972006-08-04 03:38:38 -07006#include <linux/netdevice.h>
7#include <linux/fib_rules.h>
8#include <net/flow.h>
Thomas Graf9d9e6a52007-03-25 23:20:05 -07009#include <net/rtnetlink.h>
Thomas Graf14c0b972006-08-04 03:38:38 -070010
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000011struct fib_rule {
Thomas Graf14c0b972006-08-04 03:38:38 -070012 struct list_head list;
13 atomic_t refcnt;
Patrick McHardy491deb24b2009-12-03 01:25:54 +000014 int iifindex;
Patrick McHardy1b038a52009-12-03 01:25:56 +000015 int oifindex;
Thomas Grafb8964ed2006-11-09 15:22:18 -080016 u32 mark;
17 u32 mark_mask;
Thomas Graf14c0b972006-08-04 03:38:38 -070018 u32 pref;
19 u32 flags;
20 u32 table;
21 u8 action;
Thomas Graf0947c9fe2007-03-26 17:14:15 -070022 u32 target;
23 struct fib_rule * ctarget;
Patrick McHardy491deb24b2009-12-03 01:25:54 +000024 char iifname[IFNAMSIZ];
Patrick McHardy1b038a52009-12-03 01:25:56 +000025 char oifname[IFNAMSIZ];
Thomas Graf14c0b972006-08-04 03:38:38 -070026 struct rcu_head rcu;
Denis V. Lunev51314a12008-01-20 16:47:09 -080027 struct net * fr_net;
Thomas Graf14c0b972006-08-04 03:38:38 -070028};
29
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000030struct fib_lookup_arg {
Thomas Graf14c0b972006-08-04 03:38:38 -070031 void *lookup_ptr;
32 void *result;
33 struct fib_rule *rule;
34};
35
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000036struct fib_rules_ops {
Thomas Graf14c0b972006-08-04 03:38:38 -070037 int family;
38 struct list_head list;
39 int rule_size;
Thomas Grafe1701c62007-03-24 12:46:02 -070040 int addr_size;
Thomas Graf0947c9fe2007-03-26 17:14:15 -070041 int unresolved_rules;
42 int nr_goto_rules;
Thomas Graf14c0b972006-08-04 03:38:38 -070043
44 int (*action)(struct fib_rule *,
45 struct flowi *, int,
46 struct fib_lookup_arg *);
47 int (*match)(struct fib_rule *,
48 struct flowi *, int);
49 int (*configure)(struct fib_rule *,
50 struct sk_buff *,
Thomas Graf14c0b972006-08-04 03:38:38 -070051 struct fib_rule_hdr *,
52 struct nlattr **);
53 int (*compare)(struct fib_rule *,
54 struct fib_rule_hdr *,
55 struct nlattr **);
56 int (*fill)(struct fib_rule *, struct sk_buff *,
Thomas Graf14c0b972006-08-04 03:38:38 -070057 struct fib_rule_hdr *);
Denis V. Lunev868d13a2008-01-10 03:18:25 -080058 u32 (*default_pref)(struct fib_rules_ops *ops);
Thomas Graf339bf982006-11-10 14:10:15 -080059 size_t (*nlmsg_payload)(struct fib_rule *);
Thomas Graf14c0b972006-08-04 03:38:38 -070060
Thomas Graf73417f62007-03-27 13:56:52 -070061 /* Called after modifications to the rules set, must flush
62 * the route cache if one exists. */
Denis V. Lunevae299fc2008-07-05 19:01:28 -070063 void (*flush_cache)(struct fib_rules_ops *ops);
Thomas Graf73417f62007-03-27 13:56:52 -070064
Thomas Graf14c0b972006-08-04 03:38:38 -070065 int nlgroup;
Patrick McHardyef7c79e2007-06-05 12:38:30 -070066 const struct nla_policy *policy;
Denis V. Lunev76c72d42007-09-16 15:44:27 -070067 struct list_head rules_list;
Thomas Graf14c0b972006-08-04 03:38:38 -070068 struct module *owner;
Denis V. Lunev035923832008-01-20 16:46:01 -080069 struct net *fro_net;
Eric W. Biedermane9c51582009-12-03 12:22:55 -080070 struct rcu_head rcu;
Thomas Graf14c0b972006-08-04 03:38:38 -070071};
72
Thomas Graf1f6c9552006-11-09 15:22:48 -080073#define FRA_GENERIC_POLICY \
Patrick McHardy491deb24b2009-12-03 01:25:54 +000074 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
Patrick McHardy1b038a52009-12-03 01:25:56 +000075 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
Thomas Graf1f6c9552006-11-09 15:22:48 -080076 [FRA_PRIORITY] = { .type = NLA_U32 }, \
77 [FRA_FWMARK] = { .type = NLA_U32 }, \
78 [FRA_FWMASK] = { .type = NLA_U32 }, \
Thomas Graf0947c9fe2007-03-26 17:14:15 -070079 [FRA_TABLE] = { .type = NLA_U32 }, \
80 [FRA_GOTO] = { .type = NLA_U32 }
Thomas Graf1f6c9552006-11-09 15:22:48 -080081
Thomas Graf14c0b972006-08-04 03:38:38 -070082static inline void fib_rule_get(struct fib_rule *rule)
83{
84 atomic_inc(&rule->refcnt);
85}
86
87static inline void fib_rule_put_rcu(struct rcu_head *head)
88{
89 struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
Denis V. Lunev3661a912008-04-16 02:01:56 -070090 release_net(rule->fr_net);
Thomas Graf14c0b972006-08-04 03:38:38 -070091 kfree(rule);
92}
93
94static inline void fib_rule_put(struct fib_rule *rule)
95{
96 if (atomic_dec_and_test(&rule->refcnt))
97 call_rcu(&rule->rcu, fib_rule_put_rcu);
98}
99
Patrick McHardy9e762a42006-08-10 23:09:48 -0700100static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
101{
102 if (nla[FRA_TABLE])
103 return nla_get_u32(nla[FRA_TABLE]);
104 return frh->table;
105}
106
Patrick McHardy3d0c9c42010-04-26 16:02:04 +0200107extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800108extern void fib_rules_unregister(struct fib_rules_ops *);
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800109extern void fib_rules_cleanup_ops(struct fib_rules_ops *);
Thomas Graf14c0b972006-08-04 03:38:38 -0700110
111extern int fib_rules_lookup(struct fib_rules_ops *,
112 struct flowi *, int flags,
113 struct fib_lookup_arg *);
Denis V. Lunev2994c632007-11-10 22:12:03 -0800114extern int fib_default_rule_add(struct fib_rules_ops *,
115 u32 pref, u32 table,
116 u32 flags);
Patrick McHardyd8a566b2010-04-13 05:03:15 +0000117extern u32 fib_default_rule_pref(struct fib_rules_ops *ops);
Thomas Graf14c0b972006-08-04 03:38:38 -0700118#endif