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 int iifindex; 14 int oifindex; 15 u32 mark; 16 u32 mark_mask; 17 u32 flags; 18 u32 table; 19 u8 action; 20 /* 3 bytes hole, try to use */ 21 u32 target; 22 struct fib_rule __rcu *ctarget; 23 struct net *fr_net; 24 25 atomic_t refcnt; 26 u32 pref; 27 int suppress_ifgroup; 28 int suppress_prefixlen; 29 char iifname[IFNAMSIZ]; 30 char oifname[IFNAMSIZ]; 31 struct rcu_head rcu; 32 }; 33 34 struct fib_lookup_arg { 35 void *lookup_ptr; 36 void *result; 37 struct fib_rule *rule; 38 int flags; 39 #define FIB_LOOKUP_NOREF 1 40 }; 41 42 struct fib_rules_ops { 43 int family; 44 struct list_head list; 45 int rule_size; 46 int addr_size; 47 int unresolved_rules; 48 int nr_goto_rules; 49 50 int (*action)(struct fib_rule *, 51 struct flowi *, int, 52 struct fib_lookup_arg *); 53 bool (*suppress)(struct fib_rule *, 54 struct fib_lookup_arg *); 55 int (*match)(struct fib_rule *, 56 struct flowi *, int); 57 int (*configure)(struct fib_rule *, 58 struct sk_buff *, 59 struct fib_rule_hdr *, 60 struct nlattr **); 61 void (*delete)(struct fib_rule *); 62 int (*compare)(struct fib_rule *, 63 struct fib_rule_hdr *, 64 struct nlattr **); 65 int (*fill)(struct fib_rule *, struct sk_buff *, 66 struct fib_rule_hdr *); 67 u32 (*default_pref)(struct fib_rules_ops *ops); 68 size_t (*nlmsg_payload)(struct fib_rule *); 69 70 /* Called after modifications to the rules set, must flush 71 * the route cache if one exists. */ 72 void (*flush_cache)(struct fib_rules_ops *ops); 73 74 int nlgroup; 75 const struct nla_policy *policy; 76 struct list_head rules_list; 77 struct module *owner; 78 struct net *fro_net; 79 struct rcu_head rcu; 80 }; 81 82 #define FRA_GENERIC_POLICY \ 83 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 84 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 85 [FRA_PRIORITY] = { .type = NLA_U32 }, \ 86 [FRA_FWMARK] = { .type = NLA_U32 }, \ 87 [FRA_FWMASK] = { .type = NLA_U32 }, \ 88 [FRA_TABLE] = { .type = NLA_U32 }, \ 89 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \ 90 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \ 91 [FRA_GOTO] = { .type = NLA_U32 } 92 93 static inline void fib_rule_get(struct fib_rule *rule) 94 { 95 atomic_inc(&rule->refcnt); 96 } 97 98 static inline void fib_rule_put_rcu(struct rcu_head *head) 99 { 100 struct fib_rule *rule = container_of(head, struct fib_rule, rcu); 101 release_net(rule->fr_net); 102 kfree(rule); 103 } 104 105 static inline void fib_rule_put(struct fib_rule *rule) 106 { 107 if (atomic_dec_and_test(&rule->refcnt)) 108 call_rcu(&rule->rcu, fib_rule_put_rcu); 109 } 110 111 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 112 { 113 if (nla[FRA_TABLE]) 114 return nla_get_u32(nla[FRA_TABLE]); 115 return frh->table; 116 } 117 118 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, 119 struct net *); 120 void fib_rules_unregister(struct fib_rules_ops *); 121 122 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags, 123 struct fib_lookup_arg *); 124 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table, 125 u32 flags); 126 u32 fib_default_rule_pref(struct fib_rules_ops *ops); 127 #endif 128