1 #ifndef __NET_FIB_RULES_H 2 #define __NET_FIB_RULES_H 3 4 #include <linux/types.h> 5 #include <linux/slab.h> 6 #include <linux/netdevice.h> 7 #include <linux/fib_rules.h> 8 #include <linux/refcount.h> 9 #include <net/flow.h> 10 #include <net/rtnetlink.h> 11 12 struct fib_kuid_range { 13 kuid_t start; 14 kuid_t end; 15 }; 16 17 struct fib_rule { 18 struct list_head list; 19 int iifindex; 20 int oifindex; 21 u32 mark; 22 u32 mark_mask; 23 u32 flags; 24 u32 table; 25 u8 action; 26 u8 l3mdev; 27 /* 2 bytes hole, try to use */ 28 u32 target; 29 __be64 tun_id; 30 struct fib_rule __rcu *ctarget; 31 struct net *fr_net; 32 33 refcount_t refcnt; 34 u32 pref; 35 int suppress_ifgroup; 36 int suppress_prefixlen; 37 char iifname[IFNAMSIZ]; 38 char oifname[IFNAMSIZ]; 39 struct fib_kuid_range uid_range; 40 struct rcu_head rcu; 41 }; 42 43 struct fib_lookup_arg { 44 void *lookup_ptr; 45 void *result; 46 struct fib_rule *rule; 47 u32 table; 48 int flags; 49 #define FIB_LOOKUP_NOREF 1 50 #define FIB_LOOKUP_IGNORE_LINKSTATE 2 51 }; 52 53 struct fib_rules_ops { 54 int family; 55 struct list_head list; 56 int rule_size; 57 int addr_size; 58 int unresolved_rules; 59 int nr_goto_rules; 60 61 int (*action)(struct fib_rule *, 62 struct flowi *, int, 63 struct fib_lookup_arg *); 64 bool (*suppress)(struct fib_rule *, 65 struct fib_lookup_arg *); 66 int (*match)(struct fib_rule *, 67 struct flowi *, int); 68 int (*configure)(struct fib_rule *, 69 struct sk_buff *, 70 struct fib_rule_hdr *, 71 struct nlattr **); 72 int (*delete)(struct fib_rule *); 73 int (*compare)(struct fib_rule *, 74 struct fib_rule_hdr *, 75 struct nlattr **); 76 int (*fill)(struct fib_rule *, struct sk_buff *, 77 struct fib_rule_hdr *); 78 size_t (*nlmsg_payload)(struct fib_rule *); 79 80 /* Called after modifications to the rules set, must flush 81 * the route cache if one exists. */ 82 void (*flush_cache)(struct fib_rules_ops *ops); 83 84 int nlgroup; 85 const struct nla_policy *policy; 86 struct list_head rules_list; 87 struct module *owner; 88 struct net *fro_net; 89 struct rcu_head rcu; 90 }; 91 92 #define FRA_GENERIC_POLICY \ 93 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 94 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 95 [FRA_PRIORITY] = { .type = NLA_U32 }, \ 96 [FRA_FWMARK] = { .type = NLA_U32 }, \ 97 [FRA_FWMASK] = { .type = NLA_U32 }, \ 98 [FRA_TABLE] = { .type = NLA_U32 }, \ 99 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \ 100 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \ 101 [FRA_GOTO] = { .type = NLA_U32 }, \ 102 [FRA_L3MDEV] = { .type = NLA_U8 }, \ 103 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) } 104 105 static inline void fib_rule_get(struct fib_rule *rule) 106 { 107 refcount_inc(&rule->refcnt); 108 } 109 110 static inline void fib_rule_put(struct fib_rule *rule) 111 { 112 if (refcount_dec_and_test(&rule->refcnt)) 113 kfree_rcu(rule, rcu); 114 } 115 116 #ifdef CONFIG_NET_L3_MASTER_DEV 117 static inline u32 fib_rule_get_table(struct fib_rule *rule, 118 struct fib_lookup_arg *arg) 119 { 120 return rule->l3mdev ? arg->table : rule->table; 121 } 122 #else 123 static inline u32 fib_rule_get_table(struct fib_rule *rule, 124 struct fib_lookup_arg *arg) 125 { 126 return rule->table; 127 } 128 #endif 129 130 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 131 { 132 if (nla[FRA_TABLE]) 133 return nla_get_u32(nla[FRA_TABLE]); 134 return frh->table; 135 } 136 137 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, 138 struct net *); 139 void fib_rules_unregister(struct fib_rules_ops *); 140 141 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags, 142 struct fib_lookup_arg *); 143 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table, 144 u32 flags); 145 bool fib_rule_matchall(const struct fib_rule *rule); 146 147 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, 148 struct netlink_ext_ack *extack); 149 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, 150 struct netlink_ext_ack *extack); 151 #endif 152