Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
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 <linux/refcount.h>
9#include <net/flow.h>
10#include <net/rtnetlink.h>
11
12struct fib_kuid_range {
13 kuid_t start;
14 kuid_t end;
15};
16
17struct fib_rule {
18 struct list_head list;
19 int iifindex;
20 int oifindex;
21 u32 mark;
22 u32 mark_mask;
23 u32 flags;
24 u32 table;
25 u8 action;
26 u8 l3mdev;
27 /* 2 bytes hole, try to use */
28 u32 target;
29 __be64 tun_id;
30 struct fib_rule __rcu *ctarget;
31 struct net *fr_net;
32
33 refcount_t refcnt;
34 u32 pref;
35 int suppress_ifgroup;
36 int suppress_prefixlen;
37 char iifname[IFNAMSIZ];
38 char oifname[IFNAMSIZ];
39 struct fib_kuid_range uid_range;
40 struct rcu_head rcu;
41};
42
43struct fib_lookup_arg {
44 void *lookup_ptr;
45 void *result;
46 struct fib_rule *rule;
47 u32 table;
48 int flags;
49#define FIB_LOOKUP_NOREF 1
50#define FIB_LOOKUP_IGNORE_LINKSTATE 2
51};
52
53struct fib_rules_ops {
54 int family;
55 struct list_head list;
56 int rule_size;
57 int addr_size;
58 int unresolved_rules;
59 int nr_goto_rules;
60
61 int (*action)(struct fib_rule *,
62 struct flowi *, int,
63 struct fib_lookup_arg *);
64 bool (*suppress)(struct fib_rule *,
65 struct fib_lookup_arg *);
66 int (*match)(struct fib_rule *,
67 struct flowi *, int);
68 int (*configure)(struct fib_rule *,
69 struct sk_buff *,
70 struct fib_rule_hdr *,
71 struct nlattr **);
72 int (*delete)(struct fib_rule *);
73 int (*compare)(struct fib_rule *,
74 struct fib_rule_hdr *,
75 struct nlattr **);
76 int (*fill)(struct fib_rule *, struct sk_buff *,
77 struct fib_rule_hdr *);
78 size_t (*nlmsg_payload)(struct fib_rule *);
79
80 /* Called after modifications to the rules set, must flush
81 * the route cache if one exists. */
82 void (*flush_cache)(struct fib_rules_ops *ops);
83
84 int nlgroup;
85 const struct nla_policy *policy;
86 struct list_head rules_list;
87 struct module *owner;
88 struct net *fro_net;
89 struct rcu_head rcu;
90};
91
92#define FRA_GENERIC_POLICY \
93 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
94 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
95 [FRA_PRIORITY] = { .type = NLA_U32 }, \
96 [FRA_FWMARK] = { .type = NLA_U32 }, \
97 [FRA_FWMASK] = { .type = NLA_U32 }, \
98 [FRA_TABLE] = { .type = NLA_U32 }, \
99 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
100 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
101 [FRA_GOTO] = { .type = NLA_U32 }, \
102 [FRA_L3MDEV] = { .type = NLA_U8 }, \
103 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }
104
105static inline void fib_rule_get(struct fib_rule *rule)
106{
107 refcount_inc(&rule->refcnt);
108}
109
110static inline void fib_rule_put(struct fib_rule *rule)
111{
112 if (refcount_dec_and_test(&rule->refcnt))
113 kfree_rcu(rule, rcu);
114}
115
116#ifdef CONFIG_NET_L3_MASTER_DEV
117static inline u32 fib_rule_get_table(struct fib_rule *rule,
118 struct fib_lookup_arg *arg)
119{
120 return rule->l3mdev ? arg->table : rule->table;
121}
122#else
123static inline u32 fib_rule_get_table(struct fib_rule *rule,
124 struct fib_lookup_arg *arg)
125{
126 return rule->table;
127}
128#endif
129
130static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
131{
132 if (nla[FRA_TABLE])
133 return nla_get_u32(nla[FRA_TABLE]);
134 return frh->table;
135}
136
137struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
138 struct net *);
139void fib_rules_unregister(struct fib_rules_ops *);
140
141int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
142 struct fib_lookup_arg *);
143int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
144 u32 flags);
145bool fib_rule_matchall(const struct fib_rule *rule);
146
147int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
148 struct netlink_ext_ack *extack);
149int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
150 struct netlink_ext_ack *extack);
151#endif