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
14 struct fib_kuid_range {
15 kuid_t start;
16 kuid_t end;
17 };
18
19 struct 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 u8 proto;
30 u8 ip_proto;
31 u32 target;
32 __be64 tun_id;
33 struct fib_rule __rcu *ctarget;
34 struct net *fr_net;
35
36 refcount_t refcnt;
37 u32 pref;
38 int suppress_ifgroup;
39 int suppress_prefixlen;
40 char iifname[IFNAMSIZ];
41 char oifname[IFNAMSIZ];
42 struct fib_kuid_range uid_range;
43 struct fib_rule_port_range sport_range;
44 struct fib_rule_port_range dport_range;
45 struct rcu_head rcu;
46 };
47
48 struct fib_lookup_arg {
49 void *lookup_ptr;
50 const void *lookup_data;
51 void *result;
52 struct fib_rule *rule;
53 u32 table;
54 int flags;
55 #define FIB_LOOKUP_NOREF 1
56 #define FIB_LOOKUP_IGNORE_LINKSTATE 2
57 };
58
59 struct fib_rules_ops {
60 int family;
61 struct list_head list;
62 int rule_size;
63 int addr_size;
64 int unresolved_rules;
65 int nr_goto_rules;
66 unsigned int fib_rules_seq;
67
68 int (*action)(struct fib_rule *,
69 struct flowi *, int,
70 struct fib_lookup_arg *);
71 /* __GENKSYMS__ hack to preserve the abi change that happened in
72 * cdef485217d3 ("ipv6: fix memory leak in fib6_rule_suppress")
73 */
74 #ifdef __GENKSYMS__
75 bool (*suppress)(struct fib_rule *,
76 #else
77 bool (*suppress)(struct fib_rule *, int,
78 #endif
79 struct fib_lookup_arg *);
80 int (*match)(struct fib_rule *,
81 struct flowi *, int);
82 int (*configure)(struct fib_rule *,
83 struct sk_buff *,
84 struct fib_rule_hdr *,
85 struct nlattr **,
86 struct netlink_ext_ack *);
87 int (*delete)(struct fib_rule *);
88 int (*compare)(struct fib_rule *,
89 struct fib_rule_hdr *,
90 struct nlattr **);
91 int (*fill)(struct fib_rule *, struct sk_buff *,
92 struct fib_rule_hdr *);
93 size_t (*nlmsg_payload)(struct fib_rule *);
94
95 /* Called after modifications to the rules set, must flush
96 * the route cache if one exists. */
97 void (*flush_cache)(struct fib_rules_ops *ops);
98
99 int nlgroup;
100 const struct nla_policy *policy;
101 struct list_head rules_list;
102 struct module *owner;
103 struct net *fro_net;
104 struct rcu_head rcu;
105 };
106
107 struct fib_rule_notifier_info {
108 struct fib_notifier_info info; /* must be first */
109 struct fib_rule *rule;
110 };
111
112 #define FRA_GENERIC_POLICY \
113 [FRA_UNSPEC] = { .strict_start_type = FRA_DPORT_RANGE + 1 }, \
114 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
115 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \
116 [FRA_PRIORITY] = { .type = NLA_U32 }, \
117 [FRA_FWMARK] = { .type = NLA_U32 }, \
118 [FRA_TUN_ID] = { .type = NLA_U64 }, \
119 [FRA_FWMASK] = { .type = NLA_U32 }, \
120 [FRA_TABLE] = { .type = NLA_U32 }, \
121 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
122 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
123 [FRA_GOTO] = { .type = NLA_U32 }, \
124 [FRA_L3MDEV] = { .type = NLA_U8 }, \
125 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }, \
126 [FRA_PROTOCOL] = { .type = NLA_U8 }, \
127 [FRA_IP_PROTO] = { .type = NLA_U8 }, \
128 [FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }, \
129 [FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }
130
131
fib_rule_get(struct fib_rule * rule)132 static inline void fib_rule_get(struct fib_rule *rule)
133 {
134 refcount_inc(&rule->refcnt);
135 }
136
fib_rule_put(struct fib_rule * rule)137 static inline void fib_rule_put(struct fib_rule *rule)
138 {
139 if (refcount_dec_and_test(&rule->refcnt))
140 kfree_rcu(rule, rcu);
141 }
142
143 #ifdef CONFIG_NET_L3_MASTER_DEV
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->l3mdev ? arg->table : rule->table;
148 }
149 #else
fib_rule_get_table(struct fib_rule * rule,struct fib_lookup_arg * arg)150 static inline u32 fib_rule_get_table(struct fib_rule *rule,
151 struct fib_lookup_arg *arg)
152 {
153 return rule->table;
154 }
155 #endif
156
frh_get_table(struct fib_rule_hdr * frh,struct nlattr ** nla)157 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla)
158 {
159 if (nla[FRA_TABLE])
160 return nla_get_u32(nla[FRA_TABLE]);
161 return frh->table;
162 }
163
fib_rule_port_range_set(const struct fib_rule_port_range * range)164 static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range)
165 {
166 return range->start != 0 && range->end != 0;
167 }
168
fib_rule_port_inrange(const struct fib_rule_port_range * a,__be16 port)169 static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a,
170 __be16 port)
171 {
172 return ntohs(port) >= a->start &&
173 ntohs(port) <= a->end;
174 }
175
fib_rule_port_range_valid(const struct fib_rule_port_range * a)176 static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a)
177 {
178 return a->start != 0 && a->end != 0 && a->end < 0xffff &&
179 a->start <= a->end;
180 }
181
fib_rule_port_range_compare(struct fib_rule_port_range * a,struct fib_rule_port_range * b)182 static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a,
183 struct fib_rule_port_range *b)
184 {
185 return a->start == b->start &&
186 a->end == b->end;
187 }
188
fib_rule_requires_fldissect(struct fib_rule * rule)189 static inline bool fib_rule_requires_fldissect(struct fib_rule *rule)
190 {
191 return rule->iifindex != LOOPBACK_IFINDEX && (rule->ip_proto ||
192 fib_rule_port_range_set(&rule->sport_range) ||
193 fib_rule_port_range_set(&rule->dport_range));
194 }
195
196 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *,
197 struct net *);
198 void fib_rules_unregister(struct fib_rules_ops *);
199
200 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags,
201 struct fib_lookup_arg *);
202 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table,
203 u32 flags);
204 bool fib_rule_matchall(const struct fib_rule *rule);
205 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family);
206 unsigned int fib_rules_seq_read(struct net *net, int family);
207
208 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
209 struct netlink_ext_ack *extack);
210 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
211 struct netlink_ext_ack *extack);
212 #endif
213