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_kuid_range { 12 kuid_t start; 13 kuid_t end; 14 }; 15 16 struct fib_rule { 17 struct list_head list; 18 int iifindex; 19 int oifindex; 20 u32 mark; 21 u32 mark_mask; 22 u32 flags; 23 u32 table; 24 u8 action; 25 u8 l3mdev; 26 /* 2 bytes hole, try to use */ 27 u32 target; 28 __be64 tun_id; 29 struct fib_rule __rcu *ctarget; 30 struct net *fr_net; 31 32 atomic_t refcnt; 33 u32 pref; 34 int suppress_ifgroup; 35 int suppress_prefixlen; 36 char iifname[IFNAMSIZ]; 37 char oifname[IFNAMSIZ]; 38 struct fib_kuid_range uid_range; 39 struct rcu_head rcu; 40 }; 41 42 struct fib_lookup_arg { 43 void *lookup_ptr; 44 void *result; 45 struct fib_rule *rule; 46 u32 table; 47 int flags; 48 #define FIB_LOOKUP_NOREF 1 49 #define FIB_LOOKUP_IGNORE_LINKSTATE 2 50 }; 51 52 struct fib_rules_ops { 53 int family; 54 struct list_head list; 55 int rule_size; 56 int addr_size; 57 int unresolved_rules; 58 int nr_goto_rules; 59 60 int (*action)(struct fib_rule *, 61 struct flowi *, int, 62 struct fib_lookup_arg *); 63 bool (*suppress)(struct fib_rule *, 64 struct fib_lookup_arg *); 65 int (*match)(struct fib_rule *, 66 struct flowi *, int); 67 int (*configure)(struct fib_rule *, 68 struct sk_buff *, 69 struct fib_rule_hdr *, 70 struct nlattr **); 71 int (*delete)(struct fib_rule *); 72 int (*compare)(struct fib_rule *, 73 struct fib_rule_hdr *, 74 struct nlattr **); 75 int (*fill)(struct fib_rule *, struct sk_buff *, 76 struct fib_rule_hdr *); 77 size_t (*nlmsg_payload)(struct fib_rule *); 78 79 /* Called after modifications to the rules set, must flush 80 * the route cache if one exists. */ 81 void (*flush_cache)(struct fib_rules_ops *ops); 82 83 int nlgroup; 84 const struct nla_policy *policy; 85 struct list_head rules_list; 86 struct module *owner; 87 struct net *fro_net; 88 struct rcu_head rcu; 89 }; 90 91 #define FRA_GENERIC_POLICY \ 92 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 93 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 94 [FRA_PRIORITY] = { .type = NLA_U32 }, \ 95 [FRA_FWMARK] = { .type = NLA_U32 }, \ 96 [FRA_FWMASK] = { .type = NLA_U32 }, \ 97 [FRA_TABLE] = { .type = NLA_U32 }, \ 98 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \ 99 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \ 100 [FRA_GOTO] = { .type = NLA_U32 }, \ 101 [FRA_L3MDEV] = { .type = NLA_U8 }, \ 102 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) } 103 104 static inline void fib_rule_get(struct fib_rule *rule) 105 { 106 atomic_inc(&rule->refcnt); 107 } 108 109 static inline void fib_rule_put(struct fib_rule *rule) 110 { 111 if (atomic_dec_and_test(&rule->refcnt)) 112 kfree_rcu(rule, rcu); 113 } 114 115 #ifdef CONFIG_NET_L3_MASTER_DEV 116 static inline u32 fib_rule_get_table(struct fib_rule *rule, 117 struct fib_lookup_arg *arg) 118 { 119 return rule->l3mdev ? arg->table : rule->table; 120 } 121 #else 122 static inline u32 fib_rule_get_table(struct fib_rule *rule, 123 struct fib_lookup_arg *arg) 124 { 125 return rule->table; 126 } 127 #endif 128 129 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 130 { 131 if (nla[FRA_TABLE]) 132 return nla_get_u32(nla[FRA_TABLE]); 133 return frh->table; 134 } 135 136 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, 137 struct net *); 138 void fib_rules_unregister(struct fib_rules_ops *); 139 140 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags, 141 struct fib_lookup_arg *); 142 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table, 143 u32 flags); 144 bool fib_rule_matchall(const struct fib_rule *rule); 145 146 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, 147 struct netlink_ext_ack *extack); 148 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, 149 struct netlink_ext_ack *extack); 150 #endif 151