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 11struct 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 30struct 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 38struct 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 int (*compare)(struct fib_rule *, 56 struct fib_rule_hdr *, 57 struct nlattr **); 58 int (*fill)(struct fib_rule *, struct sk_buff *, 59 struct fib_rule_hdr *); 60 u32 (*default_pref)(struct fib_rules_ops *ops); 61 size_t (*nlmsg_payload)(struct fib_rule *); 62 63 /* Called after modifications to the rules set, must flush 64 * the route cache if one exists. */ 65 void (*flush_cache)(struct fib_rules_ops *ops); 66 67 int nlgroup; 68 const struct nla_policy *policy; 69 struct list_head rules_list; 70 struct module *owner; 71 struct net *fro_net; 72 struct rcu_head rcu; 73}; 74 75#define FRA_GENERIC_POLICY \ 76 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 77 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 78 [FRA_PRIORITY] = { .type = NLA_U32 }, \ 79 [FRA_FWMARK] = { .type = NLA_U32 }, \ 80 [FRA_FWMASK] = { .type = NLA_U32 }, \ 81 [FRA_TABLE] = { .type = NLA_U32 }, \ 82 [FRA_GOTO] = { .type = NLA_U32 } 83 84static inline void fib_rule_get(struct fib_rule *rule) 85{ 86 atomic_inc(&rule->refcnt); 87} 88 89static inline void fib_rule_put_rcu(struct rcu_head *head) 90{ 91 struct fib_rule *rule = container_of(head, struct fib_rule, rcu); 92 release_net(rule->fr_net); 93 kfree(rule); 94} 95 96static inline void fib_rule_put(struct fib_rule *rule) 97{ 98 if (atomic_dec_and_test(&rule->refcnt)) 99 call_rcu(&rule->rcu, fib_rule_put_rcu); 100} 101 102static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 103{ 104 if (nla[FRA_TABLE]) 105 return nla_get_u32(nla[FRA_TABLE]); 106 return frh->table; 107} 108 109extern struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, struct net *); 110extern void fib_rules_unregister(struct fib_rules_ops *); 111 112extern int fib_rules_lookup(struct fib_rules_ops *, 113 struct flowi *, int flags, 114 struct fib_lookup_arg *); 115extern int fib_default_rule_add(struct fib_rules_ops *, 116 u32 pref, u32 table, 117 u32 flags); 118extern u32 fib_default_rule_pref(struct fib_rules_ops *ops); 119#endif 120