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 <net/flow.h> 9 #include <net/rtnetlink.h> 10 11 struct fib_rule { 12 struct list_head list; 13 int iifindex; 14 int oifindex; 15 u32 mark; 16 u32 mark_mask; 17 u32 flags; 18 u32 table; 19 u8 action; 20 /* 3 bytes hole, try to use */ 21 u32 target; 22 __be64 tun_id; 23 struct fib_rule __rcu *ctarget; 24 struct net *fr_net; 25 26 atomic_t refcnt; 27 u32 pref; 28 int suppress_ifgroup; 29 int suppress_prefixlen; 30 char iifname[IFNAMSIZ]; 31 char oifname[IFNAMSIZ]; 32 struct rcu_head rcu; 33 }; 34 35 struct fib_lookup_arg { 36 void *lookup_ptr; 37 void *result; 38 struct fib_rule *rule; 39 int flags; 40 #define FIB_LOOKUP_NOREF 1 41 #define FIB_LOOKUP_IGNORE_LINKSTATE 2 42 }; 43 44 struct fib_rules_ops { 45 int family; 46 struct list_head list; 47 int rule_size; 48 int addr_size; 49 int unresolved_rules; 50 int nr_goto_rules; 51 52 int (*action)(struct fib_rule *, 53 struct flowi *, int, 54 struct fib_lookup_arg *); 55 bool (*suppress)(struct fib_rule *, 56 struct fib_lookup_arg *); 57 int (*match)(struct fib_rule *, 58 struct flowi *, int); 59 int (*configure)(struct fib_rule *, 60 struct sk_buff *, 61 struct fib_rule_hdr *, 62 struct nlattr **); 63 int (*delete)(struct fib_rule *); 64 int (*compare)(struct fib_rule *, 65 struct fib_rule_hdr *, 66 struct nlattr **); 67 int (*fill)(struct fib_rule *, struct sk_buff *, 68 struct fib_rule_hdr *); 69 size_t (*nlmsg_payload)(struct fib_rule *); 70 71 /* Called after modifications to the rules set, must flush 72 * the route cache if one exists. */ 73 void (*flush_cache)(struct fib_rules_ops *ops); 74 75 int nlgroup; 76 const struct nla_policy *policy; 77 struct list_head rules_list; 78 struct module *owner; 79 struct net *fro_net; 80 struct rcu_head rcu; 81 }; 82 83 #define FRA_GENERIC_POLICY \ 84 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 85 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 86 [FRA_PRIORITY] = { .type = NLA_U32 }, \ 87 [FRA_FWMARK] = { .type = NLA_U32 }, \ 88 [FRA_FWMASK] = { .type = NLA_U32 }, \ 89 [FRA_TABLE] = { .type = NLA_U32 }, \ 90 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \ 91 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \ 92 [FRA_GOTO] = { .type = NLA_U32 } 93 94 static inline void fib_rule_get(struct fib_rule *rule) 95 { 96 atomic_inc(&rule->refcnt); 97 } 98 99 static inline void fib_rule_put(struct fib_rule *rule) 100 { 101 if (atomic_dec_and_test(&rule->refcnt)) 102 kfree_rcu(rule, rcu); 103 } 104 105 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 106 { 107 if (nla[FRA_TABLE]) 108 return nla_get_u32(nla[FRA_TABLE]); 109 return frh->table; 110 } 111 112 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, 113 struct net *); 114 void fib_rules_unregister(struct fib_rules_ops *); 115 116 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags, 117 struct fib_lookup_arg *); 118 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table, 119 u32 flags); 120 #endif 121