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 struct list_head list; 12 atomic_t refcnt; 13 int iifindex; 14 int oifindex; 15 u32 mark; 16 u32 mark_mask; 17 u32 pref; 18 u32 flags; 19 u32 table; 20 u8 action; 21 u32 target; 22 struct fib_rule * ctarget; 23 char iifname[IFNAMSIZ]; 24 char oifname[IFNAMSIZ]; 25 struct rcu_head rcu; 26 struct net * fr_net; 27 }; 28 29 struct fib_lookup_arg { 30 void *lookup_ptr; 31 void *result; 32 struct fib_rule *rule; 33 }; 34 35 struct fib_rules_ops { 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 fib_rule_hdr *, 51 struct nlattr **); 52 int (*compare)(struct fib_rule *, 53 struct fib_rule_hdr *, 54 struct nlattr **); 55 int (*fill)(struct fib_rule *, struct sk_buff *, 56 struct fib_rule_hdr *); 57 u32 (*default_pref)(struct fib_rules_ops *ops); 58 size_t (*nlmsg_payload)(struct fib_rule *); 59 60 /* Called after modifications to the rules set, must flush 61 * the route cache if one exists. */ 62 void (*flush_cache)(struct fib_rules_ops *ops); 63 64 int nlgroup; 65 const struct nla_policy *policy; 66 struct list_head rules_list; 67 struct module *owner; 68 struct net *fro_net; 69 struct rcu_head rcu; 70 }; 71 72 #define FRA_GENERIC_POLICY \ 73 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 74 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 75 [FRA_PRIORITY] = { .type = NLA_U32 }, \ 76 [FRA_FWMARK] = { .type = NLA_U32 }, \ 77 [FRA_FWMASK] = { .type = NLA_U32 }, \ 78 [FRA_TABLE] = { .type = NLA_U32 }, \ 79 [FRA_GOTO] = { .type = NLA_U32 } 80 81 static inline void fib_rule_get(struct fib_rule *rule) 82 { 83 atomic_inc(&rule->refcnt); 84 } 85 86 static inline void fib_rule_put_rcu(struct rcu_head *head) 87 { 88 struct fib_rule *rule = container_of(head, struct fib_rule, rcu); 89 release_net(rule->fr_net); 90 kfree(rule); 91 } 92 93 static inline void fib_rule_put(struct fib_rule *rule) 94 { 95 if (atomic_dec_and_test(&rule->refcnt)) 96 call_rcu(&rule->rcu, fib_rule_put_rcu); 97 } 98 99 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 100 { 101 if (nla[FRA_TABLE]) 102 return nla_get_u32(nla[FRA_TABLE]); 103 return frh->table; 104 } 105 106 extern struct fib_rules_ops *fib_rules_register(struct fib_rules_ops *, struct net *); 107 extern void fib_rules_unregister(struct fib_rules_ops *); 108 extern void fib_rules_cleanup_ops(struct fib_rules_ops *); 109 110 extern int fib_rules_lookup(struct fib_rules_ops *, 111 struct flowi *, int flags, 112 struct fib_lookup_arg *); 113 extern int fib_default_rule_add(struct fib_rules_ops *, 114 u32 pref, u32 table, 115 u32 flags); 116 #endif 117