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) } 124 125 126 static inline void fib_rule_get(struct fib_rule *rule) 127 { 128 refcount_inc(&rule->refcnt); 129 } 130 131 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 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 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 150 151 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 } 157 158 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 } 162 163 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 } 169 170 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 } 175 176 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 } 182 183 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