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 /* 2 bytes hole, try to use */ 30 u32 target; 31 __be64 tun_id; 32 struct fib_rule __rcu *ctarget; 33 struct net *fr_net; 34 35 refcount_t refcnt; 36 u32 pref; 37 int suppress_ifgroup; 38 int suppress_prefixlen; 39 char iifname[IFNAMSIZ]; 40 char oifname[IFNAMSIZ]; 41 struct fib_kuid_range uid_range; 42 struct rcu_head rcu; 43 }; 44 45 struct fib_lookup_arg { 46 void *lookup_ptr; 47 void *result; 48 struct fib_rule *rule; 49 u32 table; 50 int flags; 51 #define FIB_LOOKUP_NOREF 1 52 #define FIB_LOOKUP_IGNORE_LINKSTATE 2 53 }; 54 55 struct fib_rules_ops { 56 int family; 57 struct list_head list; 58 int rule_size; 59 int addr_size; 60 int unresolved_rules; 61 int nr_goto_rules; 62 unsigned int fib_rules_seq; 63 64 int (*action)(struct fib_rule *, 65 struct flowi *, int, 66 struct fib_lookup_arg *); 67 bool (*suppress)(struct fib_rule *, 68 struct fib_lookup_arg *); 69 int (*match)(struct fib_rule *, 70 struct flowi *, int); 71 int (*configure)(struct fib_rule *, 72 struct sk_buff *, 73 struct fib_rule_hdr *, 74 struct nlattr **); 75 int (*delete)(struct fib_rule *); 76 int (*compare)(struct fib_rule *, 77 struct fib_rule_hdr *, 78 struct nlattr **); 79 int (*fill)(struct fib_rule *, struct sk_buff *, 80 struct fib_rule_hdr *); 81 size_t (*nlmsg_payload)(struct fib_rule *); 82 83 /* Called after modifications to the rules set, must flush 84 * the route cache if one exists. */ 85 void (*flush_cache)(struct fib_rules_ops *ops); 86 87 int nlgroup; 88 const struct nla_policy *policy; 89 struct list_head rules_list; 90 struct module *owner; 91 struct net *fro_net; 92 struct rcu_head rcu; 93 }; 94 95 struct fib_rule_notifier_info { 96 struct fib_notifier_info info; /* must be first */ 97 struct fib_rule *rule; 98 }; 99 100 #define FRA_GENERIC_POLICY \ 101 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 102 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 103 [FRA_PRIORITY] = { .type = NLA_U32 }, \ 104 [FRA_FWMARK] = { .type = NLA_U32 }, \ 105 [FRA_FWMASK] = { .type = NLA_U32 }, \ 106 [FRA_TABLE] = { .type = NLA_U32 }, \ 107 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \ 108 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \ 109 [FRA_GOTO] = { .type = NLA_U32 }, \ 110 [FRA_L3MDEV] = { .type = NLA_U8 }, \ 111 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) } 112 113 static inline void fib_rule_get(struct fib_rule *rule) 114 { 115 refcount_inc(&rule->refcnt); 116 } 117 118 static inline void fib_rule_put(struct fib_rule *rule) 119 { 120 if (refcount_dec_and_test(&rule->refcnt)) 121 kfree_rcu(rule, rcu); 122 } 123 124 #ifdef CONFIG_NET_L3_MASTER_DEV 125 static inline u32 fib_rule_get_table(struct fib_rule *rule, 126 struct fib_lookup_arg *arg) 127 { 128 return rule->l3mdev ? arg->table : rule->table; 129 } 130 #else 131 static inline u32 fib_rule_get_table(struct fib_rule *rule, 132 struct fib_lookup_arg *arg) 133 { 134 return rule->table; 135 } 136 #endif 137 138 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 139 { 140 if (nla[FRA_TABLE]) 141 return nla_get_u32(nla[FRA_TABLE]); 142 return frh->table; 143 } 144 145 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, 146 struct net *); 147 void fib_rules_unregister(struct fib_rules_ops *); 148 149 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags, 150 struct fib_lookup_arg *); 151 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table, 152 u32 flags); 153 bool fib_rule_matchall(const struct fib_rule *rule); 154 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family); 155 unsigned int fib_rules_seq_read(struct net *net, int family); 156 157 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, 158 struct netlink_ext_ack *extack); 159 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, 160 struct netlink_ext_ack *extack); 161 #endif 162