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 bool (*suppress)(struct fib_rule *, 72 struct fib_lookup_arg *); 73 int (*match)(struct fib_rule *, 74 struct flowi *, int); 75 int (*configure)(struct fib_rule *, 76 struct sk_buff *, 77 struct fib_rule_hdr *, 78 struct nlattr **); 79 int (*delete)(struct fib_rule *); 80 int (*compare)(struct fib_rule *, 81 struct fib_rule_hdr *, 82 struct nlattr **); 83 int (*fill)(struct fib_rule *, struct sk_buff *, 84 struct fib_rule_hdr *); 85 size_t (*nlmsg_payload)(struct fib_rule *); 86 87 /* Called after modifications to the rules set, must flush 88 * the route cache if one exists. */ 89 void (*flush_cache)(struct fib_rules_ops *ops); 90 91 int nlgroup; 92 const struct nla_policy *policy; 93 struct list_head rules_list; 94 struct module *owner; 95 struct net *fro_net; 96 struct rcu_head rcu; 97 }; 98 99 struct fib_rule_notifier_info { 100 struct fib_notifier_info info; /* must be first */ 101 struct fib_rule *rule; 102 }; 103 104 #define FRA_GENERIC_POLICY \ 105 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 106 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 107 [FRA_PRIORITY] = { .type = NLA_U32 }, \ 108 [FRA_FWMARK] = { .type = NLA_U32 }, \ 109 [FRA_FWMASK] = { .type = NLA_U32 }, \ 110 [FRA_TABLE] = { .type = NLA_U32 }, \ 111 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \ 112 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \ 113 [FRA_GOTO] = { .type = NLA_U32 }, \ 114 [FRA_L3MDEV] = { .type = NLA_U8 }, \ 115 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }, \ 116 [FRA_PROTOCOL] = { .type = NLA_U8 }, \ 117 [FRA_IP_PROTO] = { .type = NLA_U8 }, \ 118 [FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }, \ 119 [FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) } 120 121 122 static inline void fib_rule_get(struct fib_rule *rule) 123 { 124 refcount_inc(&rule->refcnt); 125 } 126 127 static inline void fib_rule_put(struct fib_rule *rule) 128 { 129 if (refcount_dec_and_test(&rule->refcnt)) 130 kfree_rcu(rule, rcu); 131 } 132 133 #ifdef CONFIG_NET_L3_MASTER_DEV 134 static inline u32 fib_rule_get_table(struct fib_rule *rule, 135 struct fib_lookup_arg *arg) 136 { 137 return rule->l3mdev ? arg->table : rule->table; 138 } 139 #else 140 static inline u32 fib_rule_get_table(struct fib_rule *rule, 141 struct fib_lookup_arg *arg) 142 { 143 return rule->table; 144 } 145 #endif 146 147 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 148 { 149 if (nla[FRA_TABLE]) 150 return nla_get_u32(nla[FRA_TABLE]); 151 return frh->table; 152 } 153 154 static inline bool fib_rule_port_range_set(const struct fib_rule_port_range *range) 155 { 156 return range->start != 0 && range->end != 0; 157 } 158 159 static inline bool fib_rule_port_inrange(const struct fib_rule_port_range *a, 160 __be16 port) 161 { 162 return ntohs(port) >= a->start && 163 ntohs(port) <= a->end; 164 } 165 166 static inline bool fib_rule_port_range_valid(const struct fib_rule_port_range *a) 167 { 168 return a->start != 0 && a->end != 0 && a->end < 0xffff && 169 a->start <= a->end; 170 } 171 172 static inline bool fib_rule_port_range_compare(struct fib_rule_port_range *a, 173 struct fib_rule_port_range *b) 174 { 175 return a->start == b->start && 176 a->end == b->end; 177 } 178 179 static inline bool fib_rule_requires_fldissect(struct fib_rule *rule) 180 { 181 return rule->ip_proto || 182 fib_rule_port_range_set(&rule->sport_range) || 183 fib_rule_port_range_set(&rule->dport_range); 184 } 185 186 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, 187 struct net *); 188 void fib_rules_unregister(struct fib_rules_ops *); 189 190 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags, 191 struct fib_lookup_arg *); 192 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table, 193 u32 flags); 194 bool fib_rule_matchall(const struct fib_rule *rule); 195 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family); 196 unsigned int fib_rules_seq_read(struct net *net, int family); 197 198 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, 199 struct netlink_ext_ack *extack); 200 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, 201 struct netlink_ext_ack *extack); 202 #endif 203