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 u8 l3mdev; 21 /* 2 bytes hole, try to use */ 22 u32 target; 23 __be64 tun_id; 24 struct fib_rule __rcu *ctarget; 25 struct net *fr_net; 26 27 atomic_t refcnt; 28 u32 pref; 29 int suppress_ifgroup; 30 int suppress_prefixlen; 31 char iifname[IFNAMSIZ]; 32 char oifname[IFNAMSIZ]; 33 struct rcu_head rcu; 34 }; 35 36 struct fib_lookup_arg { 37 void *lookup_ptr; 38 void *result; 39 struct fib_rule *rule; 40 u32 table; 41 int flags; 42 #define FIB_LOOKUP_NOREF 1 43 #define FIB_LOOKUP_IGNORE_LINKSTATE 2 44 }; 45 46 struct fib_rules_ops { 47 int family; 48 struct list_head list; 49 int rule_size; 50 int addr_size; 51 int unresolved_rules; 52 int nr_goto_rules; 53 54 int (*action)(struct fib_rule *, 55 struct flowi *, int, 56 struct fib_lookup_arg *); 57 bool (*suppress)(struct fib_rule *, 58 struct fib_lookup_arg *); 59 int (*match)(struct fib_rule *, 60 struct flowi *, int); 61 int (*configure)(struct fib_rule *, 62 struct sk_buff *, 63 struct fib_rule_hdr *, 64 struct nlattr **); 65 int (*delete)(struct fib_rule *); 66 int (*compare)(struct fib_rule *, 67 struct fib_rule_hdr *, 68 struct nlattr **); 69 int (*fill)(struct fib_rule *, struct sk_buff *, 70 struct fib_rule_hdr *); 71 size_t (*nlmsg_payload)(struct fib_rule *); 72 73 /* Called after modifications to the rules set, must flush 74 * the route cache if one exists. */ 75 void (*flush_cache)(struct fib_rules_ops *ops); 76 77 int nlgroup; 78 const struct nla_policy *policy; 79 struct list_head rules_list; 80 struct module *owner; 81 struct net *fro_net; 82 struct rcu_head rcu; 83 }; 84 85 #define FRA_GENERIC_POLICY \ 86 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 87 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 88 [FRA_PRIORITY] = { .type = NLA_U32 }, \ 89 [FRA_FWMARK] = { .type = NLA_U32 }, \ 90 [FRA_FWMASK] = { .type = NLA_U32 }, \ 91 [FRA_TABLE] = { .type = NLA_U32 }, \ 92 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \ 93 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \ 94 [FRA_GOTO] = { .type = NLA_U32 }, \ 95 [FRA_L3MDEV] = { .type = NLA_U8 } 96 97 static inline void fib_rule_get(struct fib_rule *rule) 98 { 99 atomic_inc(&rule->refcnt); 100 } 101 102 static inline void fib_rule_put(struct fib_rule *rule) 103 { 104 if (atomic_dec_and_test(&rule->refcnt)) 105 kfree_rcu(rule, rcu); 106 } 107 108 #ifdef CONFIG_NET_L3_MASTER_DEV 109 static inline u32 fib_rule_get_table(struct fib_rule *rule, 110 struct fib_lookup_arg *arg) 111 { 112 return rule->l3mdev ? arg->table : rule->table; 113 } 114 #else 115 static inline u32 fib_rule_get_table(struct fib_rule *rule, 116 struct fib_lookup_arg *arg) 117 { 118 return rule->table; 119 } 120 #endif 121 122 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 123 { 124 if (nla[FRA_TABLE]) 125 return nla_get_u32(nla[FRA_TABLE]); 126 return frh->table; 127 } 128 129 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, 130 struct net *); 131 void fib_rules_unregister(struct fib_rules_ops *); 132 133 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags, 134 struct fib_lookup_arg *); 135 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table, 136 u32 flags); 137 138 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh); 139 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh); 140 #endif 141