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