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