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 #include <linux/indirect_call_wrapper.h>
14
15 struct fib_kuid_range {
16 kuid_t start;
17 kuid_t end;
18 };
19
20 struct fib_rule {
21 struct list_head list;
22 int iifindex;
23 int oifindex;
24 u32 mark;
25 u32 mark_mask;
26 u32 flags;
27 u32 table;
28 u8 action;
29 u8 l3mdev;
30 u8 proto;
31 u8 ip_proto;
32 u32 target;
33 __be64 tun_id;
34 struct fib_rule __rcu *ctarget;
35 struct net *fr_net;
36
37 refcount_t refcnt;
38 u32 pref;
39 int suppress_ifgroup;
40 int suppress_prefixlen;
41 char iifname[IFNAMSIZ];
42 char oifname[IFNAMSIZ];
43 struct fib_kuid_range uid_range;
44 struct fib_rule_port_range sport_range;
45 struct fib_rule_port_range dport_range;
46 struct rcu_head rcu;
47 };
48
49 struct fib_lookup_arg {
50 void *lookup_ptr;
51 const void *lookup_data;
52 void *result;
53 struct fib_rule *rule;
54 u32 table;
55 int flags;
56 #define FIB_LOOKUP_NOREF 1
57 #define FIB_LOOKUP_IGNORE_LINKSTATE 2
58 };
59
60 struct fib_rules_ops {
61 int family;
62 struct list_head list;
63 int rule_size;
64 int addr_size;
65 int unresolved_rules;
66 int nr_goto_rules;
67 unsigned int fib_rules_seq;
68
69 int (*action)(struct fib_rule *,
70 struct flowi *, int,
71 struct fib_lookup_arg *);
72 bool (*suppress)(struct fib_rule *,
73 struct fib_lookup_arg *);
74 int (*match)(struct fib_rule *,
75 struct flowi *, int);
76 int (*configure)(struct fib_rule *,
77 struct sk_buff *,
78 struct fib_rule_hdr *,
79 struct nlattr **,
80 struct netlink_ext_ack *);
81 int (*delete)(struct fib_rule *);
82 int (*compare)(struct fib_rule *,
83 struct fib_rule_hdr *,
84 struct nlattr **);
85 int (*fill)(struct fib_rule *, struct sk_buff *,
86 struct fib_rule_hdr *);
87 size_t (*nlmsg_payload)(struct fib_rule *);
88
89 /* Called after modifications to the rules set, must flush
90 * the route cache if one exists. */
91 void (*flush_cache)(struct fib_rules_ops *ops);
92
93 int nlgroup;
94 const struct nla_policy *policy;
95 struct list_head rules_list;
96 struct module *owner;
97 struct net *fro_net;
98 struct rcu_head rcu;
99 };
100
101 struct fib_rule_notifier_info {
102 struct fib_notifier_info info; /* must be first */
103 struct fib_rule *rule;
104 };
105
106 #define FRA_GENERIC_POLICY \
107 [FRA_UNSPEC] = { .strict_start_type = FRA_DPORT_RANGE + 1 }, \
108 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
109 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
110 [FRA_PRIORITY] = { .type = NLA_U32 }, \
111 [FRA_FWMARK] = { .type = NLA_U32 }, \
112 [FRA_TUN_ID] = { .type = NLA_U64 }, \
113 [FRA_FWMASK] = { .type = NLA_U32 }, \
114 [FRA_TABLE] = { .type = NLA_U32 }, \
115 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
116 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
117 [FRA_GOTO] = { .type = NLA_U32 }, \
118 [FRA_L3MDEV] = { .type = NLA_U8 }, \
119 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }, \
120 [FRA_PROTOCOL] = { .type = NLA_U8 }, \
121 [FRA_IP_PROTO] = { .type = NLA_U8 }, \
122 [FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }, \
123 [FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }
124
125
fib_rule_get(struct fib_rule * rule)126 static inline void fib_rule_get(struct fib_rule *rule)
127 {
128 refcount_inc(&rule->refcnt);
129 }
130
fib_rule_put(struct fib_rule * rule)131 static inline void fib_rule_put(struct fib_rule *rule)
132 {
133 if (refcount_dec_and_test(&rule->refcnt))
134 kfree_rcu(rule, rcu);
135 }
136
137 #ifdef CONFIG_NET_L3_MASTER_DEV
fib_rule_get_table(struct fib_rule * rule,struct fib_lookup_arg * arg)138 static inline u32 fib_rule_get_table(struct fib_rule *rule,
139 struct fib_lookup_arg *arg)
140 {
141 return rule->l3mdev ? arg->table : rule->table;
142 }
143 #else
fib_rule_get_table(struct fib_rule * rule,struct fib_lookup_arg * arg)144 static inline u32 fib_rule_get_table(struct fib_rule *rule,
145 struct fib_lookup_arg *arg)
146 {
147 return rule->table;
148 }
149 #endif
150
frh_get_table(struct fib_rule_hdr * frh,struct nlattr ** nla)151 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
152 {
153 if (nla[FRA_TABLE])
154 return nla_get_u32(nla[FRA_TABLE]);
155 return frh->table;
156 }
157
fib_rule_port_range_set(const struct fib_rule_port_range * range)158 static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
159 {
160 return range->start != 0 && range->end != 0;
161 }
162
fib_rule_port_inrange(const struct fib_rule_port_range * a,__be16 port)163 static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,
164 __be16 port)
165 {
166 return ntohs(port) >= a->start &&
167 ntohs(port) <= a->end;
168 }
169
fib_rule_port_range_valid(const struct fib_rule_port_range * a)170 static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)
171 {
172 return a->start != 0 && a->end != 0 && a->end < 0xffff &&
173 a->start <= a->end;
174 }
175
fib_rule_port_range_compare(struct fib_rule_port_range * a,struct fib_rule_port_range * b)176 static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,
177 struct fib_rule_port_range *b)
178 {
179 return a->start == b->start &&
180 a->end == b->end;
181 }
182
fib_rule_requires_fldissect(struct fib_rule * rule)183 static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)
184 {
185 return rule->iifindex != LOOPBACK_IFINDEX && (rule->ip_proto ||
186 fib_rule_port_range_set(&rule->sport_range) ||
187 fib_rule_port_range_set(&rule->dport_range));
188 }
189
190 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
191 struct net *);
192 void fib_rules_unregister(struct fib_rules_ops *);
193
194 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
195 struct fib_lookup_arg *);
196 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
197 u32 flags);
198 bool fib_rule_matchall(const struct fib_rule *rule);
199 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
200 struct netlink_ext_ack *extack);
201 unsigned int fib_rules_seq_read(struct net *net, int family);
202
203 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
204 struct netlink_ext_ack *extack);
205 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
206 struct netlink_ext_ack *extack);
207
208 INDIRECT_CALLABLE_DECLARE(int fib6_rule_match(struct fib_rule *rule,
209 struct flowi *fl, int flags));
210 INDIRECT_CALLABLE_DECLARE(int fib4_rule_match(struct fib_rule *rule,
211 struct flowi *fl, int flags));
212
213 INDIRECT_CALLABLE_DECLARE(int fib6_rule_action(struct fib_rule *rule,
214 struct flowi *flp, int flags,
215 struct fib_lookup_arg *arg));
216 INDIRECT_CALLABLE_DECLARE(int fib4_rule_action(struct fib_rule *rule,
217 struct flowi *flp, int flags,
218 struct fib_lookup_arg *arg));
219
220 INDIRECT_CALLABLE_DECLARE(bool fib6_rule_suppress(struct fib_rule *rule,
221 struct fib_lookup_arg *arg));
222 INDIRECT_CALLABLE_DECLARE(bool fib4_rule_suppress(struct fib_rule *rule,
223 struct fib_lookup_arg *arg));
224 #endif
225