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192.168.1.100 / T103 / 1f884588077ad3476b9c91cbb0ee9ee0332bbb68 / . / src / kernel / linux / v4.14 / include / net / fib_rules.h
blob: b8fd023ba625a1ead99acf06508a7b9a79805fff [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +0800[diff] [blame^]1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __NET_FIB_RULES_H
3#define __NET_FIB_RULES_H
4
5#include <linux/types.h>
6#include <linux/slab.h>
7#include <linux/netdevice.h>
8#include <linux/fib_rules.h>
9#include <linux/refcount.h>
10#include <net/flow.h>
11#include <net/rtnetlink.h>
12#include <net/fib_notifier.h>
13
14struct fib_kuid_range {
15 kuid_t start;
16 kuid_t end;
17};
18
19struct fib_rule {
20 struct list_head list;
21 int iifindex;
22 int oifindex;
23 u32 mark;
24 u32 mark_mask;
25 u32 flags;
26 u32 table;
27 u8 action;
28 u8 l3mdev;
29 /* 2 bytes hole, try to use */
30 u32 target;
31 __be64 tun_id;
32 struct fib_rule __rcu *ctarget;
33 struct net *fr_net;
34
35 refcount_t refcnt;
36 u32 pref;
37 int suppress_ifgroup;
38 int suppress_prefixlen;
39 char iifname[IFNAMSIZ];
40 char oifname[IFNAMSIZ];
41 struct fib_kuid_range uid_range;
42 struct rcu_head rcu;
43};
44
45struct fib_lookup_arg {
46 void *lookup_ptr;
47 void *result;
48 struct fib_rule *rule;
49 u32 table;
50 int flags;
51#define FIB_LOOKUP_NOREF 1
52#define FIB_LOOKUP_IGNORE_LINKSTATE 2
53};
54
55struct fib_rules_ops {
56 int family;
57 struct list_head list;
58 int rule_size;
59 int addr_size;
60 int unresolved_rules;
61 int nr_goto_rules;
62 unsigned int fib_rules_seq;
63
64 int (*action)(struct fib_rule *,
65 struct flowi *, int,
66 struct fib_lookup_arg *);
67 bool (*suppress)(struct fib_rule *,
68 struct fib_lookup_arg *);
69 int (*match)(struct fib_rule *,
70 struct flowi *, int);
71 int (*configure)(struct fib_rule *,
72 struct sk_buff *,
73 struct fib_rule_hdr *,
74 struct nlattr **);
75 int (*delete)(struct fib_rule *);
76 int (*compare)(struct fib_rule *,
77 struct fib_rule_hdr *,
78 struct nlattr **);
79 int (*fill)(struct fib_rule *, struct sk_buff *,
80 struct fib_rule_hdr *);
81 size_t (*nlmsg_payload)(struct fib_rule *);
82
83 /* Called after modifications to the rules set, must flush
84 * the route cache if one exists. */
85 void (*flush_cache)(struct fib_rules_ops *ops);
86
87 int nlgroup;
88 const struct nla_policy *policy;
89 struct list_head rules_list;
90 struct module *owner;
91 struct net *fro_net;
92 struct rcu_head rcu;
93};
94
95struct fib_rule_notifier_info {
96 struct fib_notifier_info info; /* must be first */
97 struct fib_rule *rule;
98};
99
100#define FRA_GENERIC_POLICY \
101 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
102 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
103 [FRA_PRIORITY] = { .type = NLA_U32 }, \
104 [FRA_FWMARK] = { .type = NLA_U32 }, \
105 [FRA_TUN_ID] = { .type = NLA_U64 }, \
106 [FRA_FWMASK] = { .type = NLA_U32 }, \
107 [FRA_TABLE] = { .type = NLA_U32 }, \
108 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
109 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
110 [FRA_GOTO] = { .type = NLA_U32 }, \
111 [FRA_L3MDEV] = { .type = NLA_U8 }, \
112 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }
113
114static inline void fib_rule_get(struct fib_rule *rule)
115{
116 refcount_inc(&rule->refcnt);
117}
118
119static inline void fib_rule_put(struct fib_rule *rule)
120{
121 if (refcount_dec_and_test(&rule->refcnt))
122 kfree_rcu(rule, rcu);
123}
124
125#ifdef CONFIG_NET_L3_MASTER_DEV
126static inline u32 fib_rule_get_table(struct fib_rule *rule,
127 struct fib_lookup_arg *arg)
128{
129 return rule->l3mdev ? arg->table : rule->table;
130}
131#else
132static inline u32 fib_rule_get_table(struct fib_rule *rule,
133 struct fib_lookup_arg *arg)
134{
135 return rule->table;
136}
137#endif
138
139static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
140{
141 if (nla[FRA_TABLE])
142 return nla_get_u32(nla[FRA_TABLE]);
143 return frh->table;
144}
145
146struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
147 struct net *);
148void fib_rules_unregister(struct fib_rules_ops *);
149
150int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
151 struct fib_lookup_arg *);
152int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
153 u32 flags);
154bool fib_rule_matchall(const struct fib_rule *rule);
155int fib_rules_dump(struct net *net, struct notifier_block *nb, int family);
156unsigned int fib_rules_seq_read(struct net *net, int family);
157
158int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
159 struct netlink_ext_ack *extack);
160int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
161 struct netlink_ext_ack *extack);
162#endif