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 /* __GENKSYMS__ hack to preserve the abi change that happened in
73 * cdef485217d3 ("ipv6: fix memory leak in fib6_rule_suppress")
74 */
75 #ifdef __GENKSYMS__
76 bool (*suppress)(struct fib_rule *,
77 #else
78 bool (*suppress)(struct fib_rule *, int,
79 #endif
80 struct fib_lookup_arg *);
81 int (*match)(struct fib_rule *,
82 struct flowi *, int);
83 int (*configure)(struct fib_rule *,
84 struct sk_buff *,
85 struct fib_rule_hdr *,
86 struct nlattr **,
87 struct netlink_ext_ack *);
88 int (*delete)(struct fib_rule *);
89 int (*compare)(struct fib_rule *,
90 struct fib_rule_hdr *,
91 struct nlattr **);
92 int (*fill)(struct fib_rule *, struct sk_buff *,
93 struct fib_rule_hdr *);
94 size_t (*nlmsg_payload)(struct fib_rule *);
95
96 /* Called after modifications to the rules set, must flush
97 * the route cache if one exists. */
98 void (*flush_cache)(struct fib_rules_ops *ops);
99
100 int nlgroup;
101 const struct nla_policy *policy;
102 struct list_head rules_list;
103 struct module *owner;
104 struct net *fro_net;
105 struct rcu_head rcu;
106 };
107
108 struct fib_rule_notifier_info {
109 struct fib_notifier_info info; /* must be first */
110 struct fib_rule *rule;
111 };
112
113 #define FRA_GENERIC_POLICY \
114 [FRA_UNSPEC] = { .strict_start_type = FRA_DPORT_RANGE + 1 }, \
115 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
116 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
117 [FRA_PRIORITY] = { .type = NLA_U32 }, \
118 [FRA_FWMARK] = { .type = NLA_U32 }, \
119 [FRA_TUN_ID] = { .type = NLA_U64 }, \
120 [FRA_FWMASK] = { .type = NLA_U32 }, \
121 [FRA_TABLE] = { .type = NLA_U32 }, \
122 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
123 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
124 [FRA_GOTO] = { .type = NLA_U32 }, \
125 [FRA_L3MDEV] = { .type = NLA_U8 }, \
126 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }, \
127 [FRA_PROTOCOL] = { .type = NLA_U8 }, \
128 [FRA_IP_PROTO] = { .type = NLA_U8 }, \
129 [FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }, \
130 [FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }
131
132
fib_rule_get(struct fib_rule * rule)133 static inline void fib_rule_get(struct fib_rule *rule)
134 {
135 refcount_inc(&rule->refcnt);
136 }
137
fib_rule_put(struct fib_rule * rule)138 static inline void fib_rule_put(struct fib_rule *rule)
139 {
140 if (refcount_dec_and_test(&rule->refcnt))
141 kfree_rcu(rule, rcu);
142 }
143
144 #ifdef CONFIG_NET_L3_MASTER_DEV
fib_rule_get_table(struct fib_rule * rule,struct fib_lookup_arg * arg)145 static inline u32 fib_rule_get_table(struct fib_rule *rule,
146 struct fib_lookup_arg *arg)
147 {
148 return rule->l3mdev ? arg->table : rule->table;
149 }
150 #else
fib_rule_get_table(struct fib_rule * rule,struct fib_lookup_arg * arg)151 static inline u32 fib_rule_get_table(struct fib_rule *rule,
152 struct fib_lookup_arg *arg)
153 {
154 return rule->table;
155 }
156 #endif
157
frh_get_table(struct fib_rule_hdr * frh,struct nlattr ** nla)158 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
159 {
160 if (nla[FRA_TABLE])
161 return nla_get_u32(nla[FRA_TABLE]);
162 return frh->table;
163 }
164
fib_rule_port_range_set(const struct fib_rule_port_range * range)165 static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
166 {
167 return range->start != 0 && range->end != 0;
168 }
169
fib_rule_port_inrange(const struct fib_rule_port_range * a,__be16 port)170 static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,
171 __be16 port)
172 {
173 return ntohs(port) >= a->start &&
174 ntohs(port) <= a->end;
175 }
176
fib_rule_port_range_valid(const struct fib_rule_port_range * a)177 static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)
178 {
179 return a->start != 0 && a->end != 0 && a->end < 0xffff &&
180 a->start <= a->end;
181 }
182
fib_rule_port_range_compare(struct fib_rule_port_range * a,struct fib_rule_port_range * b)183 static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,
184 struct fib_rule_port_range *b)
185 {
186 return a->start == b->start &&
187 a->end == b->end;
188 }
189
fib_rule_requires_fldissect(struct fib_rule * rule)190 static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)
191 {
192 return rule->iifindex != LOOPBACK_IFINDEX && (rule->ip_proto ||
193 fib_rule_port_range_set(&rule->sport_range) ||
194 fib_rule_port_range_set(&rule->dport_range));
195 }
196
197 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
198 struct net *);
199 void fib_rules_unregister(struct fib_rules_ops *);
200
201 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
202 struct fib_lookup_arg *);
203 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
204 u32 flags);
205 bool fib_rule_matchall(const struct fib_rule *rule);
206 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family,
207 struct netlink_ext_ack *extack);
208 unsigned int fib_rules_seq_read(struct net *net, int family);
209
210 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
211 struct netlink_ext_ack *extack);
212 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
213 struct netlink_ext_ack *extack);
214
215 INDIRECT_CALLABLE_DECLARE(int fib6_rule_match(struct fib_rule *rule,
216 struct flowi *fl, int flags));
217 INDIRECT_CALLABLE_DECLARE(int fib4_rule_match(struct fib_rule *rule,
218 struct flowi *fl, int flags));
219
220 INDIRECT_CALLABLE_DECLARE(int fib6_rule_action(struct fib_rule *rule,
221 struct flowi *flp, int flags,
222 struct fib_lookup_arg *arg));
223 INDIRECT_CALLABLE_DECLARE(int fib4_rule_action(struct fib_rule *rule,
224 struct flowi *flp, int flags,
225 struct fib_lookup_arg *arg));
226
227 INDIRECT_CALLABLE_DECLARE(bool fib6_rule_suppress(struct fib_rule *rule,
228 int flags,
229 struct fib_lookup_arg *arg));
230 INDIRECT_CALLABLE_DECLARE(bool fib4_rule_suppress(struct fib_rule *rule,
231 int flags,
232 struct fib_lookup_arg *arg));
233 #endif
234