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