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 <linux/refcount.h> 9 #include <net/flow.h> 10 #include <net/rtnetlink.h> 11 #include <net/fib_notifier.h> 12 13 struct fib_kuid_range { 14 kuid_t start; 15 kuid_t end; 16 }; 17 18 struct fib_rule { 19 struct list_head list; 20 int iifindex; 21 int oifindex; 22 u32 mark; 23 u32 mark_mask; 24 u32 flags; 25 u32 table; 26 u8 action; 27 u8 l3mdev; 28 /* 2 bytes hole, try to use */ 29 u32 target; 30 __be64 tun_id; 31 struct fib_rule __rcu *ctarget; 32 struct net *fr_net; 33 34 refcount_t refcnt; 35 u32 pref; 36 int suppress_ifgroup; 37 int suppress_prefixlen; 38 char iifname[IFNAMSIZ]; 39 char oifname[IFNAMSIZ]; 40 struct fib_kuid_range uid_range; 41 struct rcu_head rcu; 42 }; 43 44 struct fib_lookup_arg { 45 void *lookup_ptr; 46 void *result; 47 struct fib_rule *rule; 48 u32 table; 49 int flags; 50 #define FIB_LOOKUP_NOREF 1 51 #define FIB_LOOKUP_IGNORE_LINKSTATE 2 52 }; 53 54 struct fib_rules_ops { 55 int family; 56 struct list_head list; 57 int rule_size; 58 int addr_size; 59 int unresolved_rules; 60 int nr_goto_rules; 61 unsigned int fib_rules_seq; 62 63 int (*action)(struct fib_rule *, 64 struct flowi *, int, 65 struct fib_lookup_arg *); 66 bool (*suppress)(struct fib_rule *, 67 struct fib_lookup_arg *); 68 int (*match)(struct fib_rule *, 69 struct flowi *, int); 70 int (*configure)(struct fib_rule *, 71 struct sk_buff *, 72 struct fib_rule_hdr *, 73 struct nlattr **); 74 int (*delete)(struct fib_rule *); 75 int (*compare)(struct fib_rule *, 76 struct fib_rule_hdr *, 77 struct nlattr **); 78 int (*fill)(struct fib_rule *, struct sk_buff *, 79 struct fib_rule_hdr *); 80 size_t (*nlmsg_payload)(struct fib_rule *); 81 82 /* Called after modifications to the rules set, must flush 83 * the route cache if one exists. */ 84 void (*flush_cache)(struct fib_rules_ops *ops); 85 86 int nlgroup; 87 const struct nla_policy *policy; 88 struct list_head rules_list; 89 struct module *owner; 90 struct net *fro_net; 91 struct rcu_head rcu; 92 }; 93 94 struct fib_rule_notifier_info { 95 struct fib_notifier_info info; /* must be first */ 96 struct fib_rule *rule; 97 }; 98 99 #define FRA_GENERIC_POLICY \ 100 [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 101 [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ 102 [FRA_PRIORITY] = { .type = NLA_U32 }, \ 103 [FRA_FWMARK] = { .type = NLA_U32 }, \ 104 [FRA_FWMASK] = { .type = NLA_U32 }, \ 105 [FRA_TABLE] = { .type = NLA_U32 }, \ 106 [FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \ 107 [FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \ 108 [FRA_GOTO] = { .type = NLA_U32 }, \ 109 [FRA_L3MDEV] = { .type = NLA_U8 }, \ 110 [FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) } 111 112 static inline void fib_rule_get(struct fib_rule *rule) 113 { 114 refcount_inc(&rule->refcnt); 115 } 116 117 static inline void fib_rule_put(struct fib_rule *rule) 118 { 119 if (refcount_dec_and_test(&rule->refcnt)) 120 kfree_rcu(rule, rcu); 121 } 122 123 #ifdef CONFIG_NET_L3_MASTER_DEV 124 static inline u32 fib_rule_get_table(struct fib_rule *rule, 125 struct fib_lookup_arg *arg) 126 { 127 return rule->l3mdev ? arg->table : rule->table; 128 } 129 #else 130 static inline u32 fib_rule_get_table(struct fib_rule *rule, 131 struct fib_lookup_arg *arg) 132 { 133 return rule->table; 134 } 135 #endif 136 137 static inline u32 frh_get_table(struct fib_rule_hdr *frh, struct nlattr **nla) 138 { 139 if (nla[FRA_TABLE]) 140 return nla_get_u32(nla[FRA_TABLE]); 141 return frh->table; 142 } 143 144 struct fib_rules_ops *fib_rules_register(const struct fib_rules_ops *, 145 struct net *); 146 void fib_rules_unregister(struct fib_rules_ops *); 147 148 int fib_rules_lookup(struct fib_rules_ops *, struct flowi *, int flags, 149 struct fib_lookup_arg *); 150 int fib_default_rule_add(struct fib_rules_ops *, u32 pref, u32 table, 151 u32 flags); 152 bool fib_rule_matchall(const struct fib_rule *rule); 153 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family); 154 unsigned int fib_rules_seq_read(struct net *net, int family); 155 156 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, 157 struct netlink_ext_ack *extack); 158 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, 159 struct netlink_ext_ack *extack); 160 #endif 161