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 u16 sport_mask; 47 u16 dport_mask; 48 struct rcu_head rcu; 49 }; 50 51 struct fib_lookup_arg { 52 void *lookup_ptr; 53 const void *lookup_data; 54 void *result; 55 struct fib_rule *rule; 56 u32 table; 57 int flags; 58 #define FIB_LOOKUP_NOREF 1 59 #define FIB_LOOKUP_IGNORE_LINKSTATE 2 60 }; 61 62 struct fib_rules_ops { 63 int family; 64 struct list_head list; 65 int rule_size; 66 int addr_size; 67 int unresolved_rules; 68 int nr_goto_rules; 69 unsigned int fib_rules_seq; 70 71 int (*action)(struct fib_rule *, 72 struct flowi *, int, 73 struct fib_lookup_arg *); 74 bool (*suppress)(struct fib_rule *, int, 75 struct fib_lookup_arg *); 76 int (*match)(struct fib_rule *, 77 struct flowi *, int); 78 int (*configure)(struct fib_rule *, 79 struct sk_buff *, 80 struct fib_rule_hdr *, 81 struct nlattr **, 82 struct netlink_ext_ack *); 83 int (*delete)(struct fib_rule *); 84 int (*compare)(struct fib_rule *, 85 struct fib_rule_hdr *, 86 struct nlattr **); 87 int (*fill)(struct fib_rule *, struct sk_buff *, 88 struct fib_rule_hdr *); 89 size_t (*nlmsg_payload)(struct fib_rule *); 90 91 /* Called after modifications to the rules set, must flush 92 * the route cache if one exists. */ 93 void (*flush_cache)(struct fib_rules_ops *ops); 94 95 int nlgroup; 96 struct list_head rules_list; 97 struct module *owner; 98 struct net *fro_net; 99 struct rcu_head rcu; 100 }; 101 102 struct fib_rule_notifier_info { 103 struct fib_notifier_info info; /* must be first */ 104 struct fib_rule *rule; 105 }; 106 107 static inline void fib_rule_get(struct fib_rule *rule) 108 { 109 refcount_inc(&rule->refcnt); 110 } 111 112 static inline void fib_rule_put(struct fib_rule *rule) 113 { 114 if (refcount_dec_and_test(&rule->refcnt)) 115 kfree_rcu(rule, rcu); 116 } 117 118 #ifdef CONFIG_NET_L3_MASTER_DEV 119 static inline u32 fib_rule_get_table(struct fib_rule *rule, 120 struct fib_lookup_arg *arg) 121 { 122 return rule->l3mdev ? arg->table : rule->table; 123 } 124 #else 125 static inline u32 fib_rule_get_table(struct fib_rule *rule, 126 struct fib_lookup_arg *arg) 127 { 128 return rule->table; 129 } 130 #endif 131 132 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 133 { 134 if (nla[FRA_TABLE]) 135 return nla_get_u32(nla[FRA_TABLE]); 136 return frh->table; 137 } 138 139 static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range) 140 { 141 return range->start != 0 && range->end != 0; 142 } 143 144 static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a, 145 __be16 port) 146 { 147 return ntohs(port) >= a->start && 148 ntohs(port) <= a->end; 149 } 150 151 static inline bool fib_rule_port_match(const struct fib_rule_port_range *range, 152 u16 port_mask, __be16 port) 153 { 154 if ((range->start ^ ntohs(port)) & port_mask) 155 return false; 156 if (!port_mask && fib_rule_port_range_set(range) && 157 !fib_rule_port_inrange(range, port)) 158 return false; 159 return true; 160 } 161 162 static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a) 163 { 164 return a->start != 0 && a->end != 0 && a->end < 0xffff && 165 a->start <= a->end; 166 } 167 168 static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a, 169 struct fib_rule_port_range *b) 170 { 171 return a->start == b->start && 172 a->end == b->end; 173 } 174 175 static inline bool 176 fib_rule_port_is_range(const struct fib_rule_port_range *range) 177 { 178 return range->start != range->end; 179 } 180 181 static inline bool fib_rule_requires_fldissect(struct fib_rule *rule) 182 { 183 return rule->iifindex != LOOPBACK_IFINDEX && (rule->ip_proto || 184 fib_rule_port_range_set(&rule->sport_range) || 185 fib_rule_port_range_set(&rule->dport_range)); 186 } 187 188 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, 189 struct net *); 190 void fib_rules_unregister(struct fib_rules_ops *); 191 192 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags, 193 struct fib_lookup_arg *); 194 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table); 195 bool fib_rule_matchall(const struct fib_rule *rule); 196 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family, 197 struct netlink_ext_ack *extack); 198 unsigned int fib_rules_seq_read(const struct net *net, int family); 199 200 int fib_newrule(struct net *net, struct sk_buff *skb, struct nlmsghdr *nlh, 201 struct netlink_ext_ack *extack, bool rtnl_held); 202 int fib_delrule(struct net *net, struct sk_buff *skb, struct nlmsghdr *nlh, 203 struct netlink_ext_ack *extack, bool rtnl_held); 204 205 INDIRECT_CALLABLE_DECLARE(int fib6_rule_match(struct fib_rule *rule, 206 struct flowi *fl, int flags)); 207 INDIRECT_CALLABLE_DECLARE(int fib4_rule_match(struct fib_rule *rule, 208 struct flowi *fl, int flags)); 209 210 INDIRECT_CALLABLE_DECLARE(int fib6_rule_action(struct fib_rule *rule, 211 struct flowi *flp, int flags, 212 struct fib_lookup_arg *arg)); 213 INDIRECT_CALLABLE_DECLARE(int fib4_rule_action(struct fib_rule *rule, 214 struct flowi *flp, int flags, 215 struct fib_lookup_arg *arg)); 216 217 INDIRECT_CALLABLE_DECLARE(bool fib6_rule_suppress(struct fib_rule *rule, 218 int flags, 219 struct fib_lookup_arg *arg)); 220 INDIRECT_CALLABLE_DECLARE(bool fib4_rule_suppress(struct fib_rule *rule, 221 int flags, 222 struct fib_lookup_arg *arg)); 223 #endif 224