1 #ifndef __NET_FIB_RULES_H 2 #define __NET_FIB_RULES_H 3 4 #include <linux/types.h> 5 #include <linux/netdevice.h> 6 #include <linux/fib_rules.h> 7 #include <net/flow.h> 8 #include <net/rtnetlink.h> 9 10 struct fib_rule 11 { 12 struct list_head list; 13 atomic_t refcnt; 14 int ifindex; 15 char ifname[IFNAMSIZ]; 16 u32 mark; 17 u32 mark_mask; 18 u32 pref; 19 u32 flags; 20 u32 table; 21 u8 action; 22 u32 target; 23 struct fib_rule * ctarget; 24 struct rcu_head rcu; 25 }; 26 27 struct fib_lookup_arg 28 { 29 void *lookup_ptr; 30 void *result; 31 struct fib_rule *rule; 32 }; 33 34 struct fib_rules_ops 35 { 36 int family; 37 struct list_head list; 38 int rule_size; 39 int addr_size; 40 int unresolved_rules; 41 int nr_goto_rules; 42 43 int (*action)(struct fib_rule *, 44 struct flowi *, int, 45 struct fib_lookup_arg *); 46 int (*match)(struct fib_rule *, 47 struct flowi *, int); 48 int (*configure)(struct fib_rule *, 49 struct sk_buff *, 50 struct nlmsghdr *, 51 struct fib_rule_hdr *, 52 struct nlattr **); 53 int (*compare)(struct fib_rule *, 54 struct fib_rule_hdr *, 55 struct nlattr **); 56 int (*fill)(struct fib_rule *, struct sk_buff *, 57 struct nlmsghdr *, 58 struct fib_rule_hdr *); 59 u32 (*default_pref)(void); 60 size_t (*nlmsg_payload)(struct fib_rule *); 61 62 /* Called after modifications to the rules set, must flush 63 * the route cache if one exists. */ 64 void (*flush_cache)(void); 65 66 int nlgroup; 67 const struct nla_policy *policy; 68 struct list_head *rules_list; 69 struct module *owner; 70 }; 71 72 #define FRA_GENERIC_POLICY \ 73 [FRA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 74 [FRA_PRIORITY] = { .type = NLA_U32 }, \ 75 [FRA_FWMARK] = { .type = NLA_U32 }, \ 76 [FRA_FWMASK] = { .type = NLA_U32 }, \ 77 [FRA_TABLE] = { .type = NLA_U32 }, \ 78 [FRA_GOTO] = { .type = NLA_U32 } 79 80 static inline void fib_rule_get(struct fib_rule *rule) 81 { 82 atomic_inc(&rule->refcnt); 83 } 84 85 static inline void fib_rule_put_rcu(struct rcu_head *head) 86 { 87 struct fib_rule *rule = container_of(head, struct fib_rule, rcu); 88 kfree(rule); 89 } 90 91 static inline void fib_rule_put(struct fib_rule *rule) 92 { 93 if (atomic_dec_and_test(&rule->refcnt)) 94 call_rcu(&rule->rcu, fib_rule_put_rcu); 95 } 96 97 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 98 { 99 if (nla[FRA_TABLE]) 100 return nla_get_u32(nla[FRA_TABLE]); 101 return frh->table; 102 } 103 104 extern int fib_rules_register(struct fib_rules_ops *); 105 extern int fib_rules_unregister(struct fib_rules_ops *); 106 107 extern int fib_rules_lookup(struct fib_rules_ops *, 108 struct flowi *, int flags, 109 struct fib_lookup_arg *); 110 #endif 111