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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 McHardy491deb22009-12-03 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;
Eric Dumazet7a2b03c2010-10-26 09:24:55 +000023 struct fib_rule __rcu *ctarget;
Patrick McHardy491deb22009-12-03 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;
Eric Dumazetebc0ffa2010-10-05 10:41:36 +000034 int flags;
35#define FIB_LOOKUP_NOREF 1
Thomas Graf14c0b972006-08-04 03:38:38 -070036};
37
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000038struct fib_rules_ops {
Thomas Graf14c0b972006-08-04 03:38:38 -070039 int family;
40 struct list_head list;
41 int rule_size;
Thomas Grafe1701c62007-03-24 12:46:02 -070042 int addr_size;
Thomas Graf0947c9fe2007-03-26 17:14:15 -070043 int unresolved_rules;
44 int nr_goto_rules;
Thomas Graf14c0b972006-08-04 03:38:38 -070045
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 *,
Thomas Graf14c0b972006-08-04 03:38:38 -070053 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 *,
Thomas Graf14c0b972006-08-04 03:38:38 -070059 struct fib_rule_hdr *);
Denis V. Lunev868d13a2008-01-10 03:18:25 -080060 u32 (*default_pref)(struct fib_rules_ops *ops);
Thomas Graf339bf982006-11-10 14:10:15 -080061 size_t (*nlmsg_payload)(struct fib_rule *);
Thomas Graf14c0b972006-08-04 03:38:38 -070062
Thomas Graf73417f62007-03-27 13:56:52 -070063 /* Called after modifications to the rules set, must flush
64 * the route cache if one exists. */
Denis V. Lunevae299fc2008-07-05 19:01:28 -070065 void (*flush_cache)(struct fib_rules_ops *ops);
Thomas Graf73417f62007-03-27 13:56:52 -070066
Thomas Graf14c0b972006-08-04 03:38:38 -070067 int nlgroup;
Patrick McHardyef7c79e2007-06-05 12:38:30 -070068 const struct nla_policy *policy;
Denis V. Lunev76c72d42007-09-16 15:44:27 -070069 struct list_head rules_list;
Thomas Graf14c0b972006-08-04 03:38:38 -070070 struct module *owner;
Denis V. Lunev03592382008-01-20 16:46:01 -080071 struct net *fro_net;
Eric W. Biedermane9c51582009-12-03 12:22:55 -080072 struct rcu_head rcu;
Thomas Graf14c0b972006-08-04 03:38:38 -070073};
74
Thomas Graf1f6c9552006-11-09 15:22:48 -080075#define FRA_GENERIC_POLICY \
Patrick McHardy491deb22009-12-03 01:25:54 +000076 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
Patrick McHardy1b038a52009-12-03 01:25:56 +000077 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
Thomas Graf1f6c9552006-11-09 15:22:48 -080078 [FRA_PRIORITY] = { .type = NLA_U32 }, \
79 [FRA_FWMARK] = { .type = NLA_U32 }, \
80 [FRA_FWMASK] = { .type = NLA_U32 }, \
Thomas Graf0947c9fe2007-03-26 17:14:15 -070081 [FRA_TABLE] = { .type = NLA_U32 }, \
82 [FRA_GOTO] = { .type = NLA_U32 }
Thomas Graf1f6c9552006-11-09 15:22:48 -080083
Thomas Graf14c0b972006-08-04 03:38:38 -070084static 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);
Denis V. Lunev3661a912008-04-16 02:01:56 -070092 release_net(rule->fr_net);
Thomas Graf14c0b972006-08-04 03:38:38 -070093 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
Patrick McHardy9e762a42006-08-10 23:09:48 -0700102static 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
Patrick McHardy3d0c9c42010-04-26 16:02:04 +0200109extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *);
Denis V. Lunev9e3a5482008-01-20 16:46:41 -0800110extern void fib_rules_unregister(struct fib_rules_ops *);
Thomas Graf14c0b972006-08-04 03:38:38 -0700111
112extern int fib_rules_lookup(struct fib_rules_ops *,
113 struct flowi *, int flags,
114 struct fib_lookup_arg *);
Denis V. Lunev2994c632007-11-10 22:12:03 -0800115extern int fib_default_rule_add(struct fib_rules_ops *,
116 u32 pref, u32 table,
117 u32 flags);
Patrick McHardyd8a566b2010-04-13 05:03:15 +0000118extern u32 fib_default_rule_pref(struct fib_rules_ops *ops);
Thomas Graf14c0b972006-08-04 03:38:38 -0700119#endif