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