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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;
Patrick McHardy491deb22009-12-03 01:25:54 +000013 int iifindex;
Patrick McHardy1b038a52009-12-03 01:25:56 +000014 int oifindex;
Thomas Grafb8964ed2006-11-09 15:22:18 -080015 u32 mark;
16 u32 mark_mask;
Thomas Graf14c0b972006-08-04 03:38:38 -070017 u32 flags;
18 u32 table;
19 u8 action;
Eric Dumazetfba36792013-08-03 11:50:35 -070020 /* 3 bytes hole, try to use */
Thomas Graf0947c9fe2007-03-26 17:14:15 -070021 u32 target;
Eric Dumazet7a2b03c2010-10-26 09:24:55 +000022 struct fib_rule __rcu *ctarget;
Eric Dumazetfba36792013-08-03 11:50:35 -070023 struct net *fr_net;
24
25 atomic_t refcnt;
26 u32 pref;
27 int suppress_ifgroup;
28 int suppress_prefixlen;
Patrick McHardy491deb22009-12-03 01:25:54 +000029 char iifname[IFNAMSIZ];
Patrick McHardy1b038a52009-12-03 01:25:56 +000030 char oifname[IFNAMSIZ];
Thomas Graf14c0b972006-08-04 03:38:38 -070031 struct rcu_head rcu;
32};
33
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000034struct fib_lookup_arg {
Thomas Graf14c0b972006-08-04 03:38:38 -070035 void *lookup_ptr;
36 void *result;
37 struct fib_rule *rule;
Eric Dumazetebc0ffa2010-10-05 10:41:36 +000038 int flags;
39#define FIB_LOOKUP_NOREF 1
Thomas Graf14c0b972006-08-04 03:38:38 -070040};
41
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000042struct fib_rules_ops {
Thomas Graf14c0b972006-08-04 03:38:38 -070043 int family;
44 struct list_head list;
45 int rule_size;
Thomas Grafe1701c62007-03-24 12:46:02 -070046 int addr_size;
Thomas Graf0947c9fe2007-03-26 17:14:15 -070047 int unresolved_rules;
48 int nr_goto_rules;
Thomas Graf14c0b972006-08-04 03:38:38 -070049
50 int (*action)(struct fib_rule *,
51 struct flowi *, int,
52 struct fib_lookup_arg *);
Stefan Tomanek7764a452013-08-01 02:17:15 +020053 bool (*suppress)(struct fib_rule *,
54 struct fib_lookup_arg *);
Thomas Graf14c0b972006-08-04 03:38:38 -070055 int (*match)(struct fib_rule *,
56 struct flowi *, int);
57 int (*configure)(struct fib_rule *,
58 struct sk_buff *,
Thomas Graf14c0b972006-08-04 03:38:38 -070059 struct fib_rule_hdr *,
60 struct nlattr **);
David S. Miller7a9bc9b2012-06-29 01:32:45 -070061 void (*delete)(struct fib_rule *);
Thomas Graf14c0b972006-08-04 03:38:38 -070062 int (*compare)(struct fib_rule *,
63 struct fib_rule_hdr *,
64 struct nlattr **);
65 int (*fill)(struct fib_rule *, struct sk_buff *,
Thomas Graf14c0b972006-08-04 03:38:38 -070066 struct fib_rule_hdr *);
Denis V. Lunev868d13a2008-01-10 03:18:25 -080067 u32 (*default_pref)(struct fib_rules_ops *ops);
Thomas Graf339bf982006-11-10 14:10:15 -080068 size_t (*nlmsg_payload)(struct fib_rule *);
Thomas Graf14c0b972006-08-04 03:38:38 -070069
Thomas Graf73417f62007-03-27 13:56:52 -070070 /* Called after modifications to the rules set, must flush
71 * the route cache if one exists. */
Denis V. Lunevae299fc2008-07-05 19:01:28 -070072 void (*flush_cache)(struct fib_rules_ops *ops);
Thomas Graf73417f62007-03-27 13:56:52 -070073
Thomas Graf14c0b972006-08-04 03:38:38 -070074 int nlgroup;
Patrick McHardyef7c79e2007-06-05 12:38:30 -070075 const struct nla_policy *policy;
Denis V. Lunev76c72d42007-09-16 15:44:27 -070076 struct list_head rules_list;
Thomas Graf14c0b972006-08-04 03:38:38 -070077 struct module *owner;
Denis V. Lunev03592382008-01-20 16:46:01 -080078 struct net *fro_net;
Eric W. Biedermane9c51582009-12-03 12:22:55 -080079 struct rcu_head rcu;
Thomas Graf14c0b972006-08-04 03:38:38 -070080};
81
Thomas Graf1f6c9552006-11-09 15:22:48 -080082#define FRA_GENERIC_POLICY \
Patrick McHardy491deb22009-12-03 01:25:54 +000083 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
Patrick McHardy1b038a52009-12-03 01:25:56 +000084 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
Thomas Graf1f6c9552006-11-09 15:22:48 -080085 [FRA_PRIORITY] = { .type = NLA_U32 }, \
86 [FRA_FWMARK] = { .type = NLA_U32 }, \
87 [FRA_FWMASK] = { .type = NLA_U32 }, \
Thomas Graf0947c9fe2007-03-26 17:14:15 -070088 [FRA_TABLE] = { .type = NLA_U32 }, \
Stefan Tomanek73f56982013-08-03 14:14:43 +020089 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
Stefan Tomanek6ef94cf2013-08-02 17:19:56 +020090 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
Thomas Graf0947c9fe2007-03-26 17:14:15 -070091 [FRA_GOTO] = { .type = NLA_U32 }
Thomas Graf1f6c9552006-11-09 15:22:48 -080092
Thomas Graf14c0b972006-08-04 03:38:38 -070093static inline void fib_rule_get(struct fib_rule *rule)
94{
95 atomic_inc(&rule->refcnt);
96}
97
98static inline void fib_rule_put_rcu(struct rcu_head *head)
99{
100 struct fib_rule *rule = container_of(head, struct fib_rule, rcu);
Denis V. Lunev3661a912008-04-16 02:01:56 -0700101 release_net(rule->fr_net);
Thomas Graf14c0b972006-08-04 03:38:38 -0700102 kfree(rule);
103}
104
105static 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
Patrick McHardy9e762a42006-08-10 23:09:48 -0700111static 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
Joe Perches8de68792013-09-20 11:23:23 -0700118struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
119 struct net *);
120void fib_rules_unregister(struct fib_rules_ops *);
Thomas Graf14c0b972006-08-04 03:38:38 -0700121
Joe Perches8de68792013-09-20 11:23:23 -0700122int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
123 struct fib_lookup_arg *);
124int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
125 u32 flags);
126u32 fib_default_rule_pref(struct fib_rules_ops *ops);
Thomas Graf14c0b972006-08-04 03:38:38 -0700127#endif