include/net/dn_fib.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _NET_DN_FIB_H
   3 #define _NET_DN_FIB_H
   4
   5 #include <linux/netlink.h>
   6 #include <linux/refcount.h>
   7
   8 extern const struct nla_policy rtm_dn_policy[];
   9
  10 struct dn_fib_res {
  11         struct fib_rule *r;
  12         struct dn_fib_info *fi;
  13         unsigned char prefixlen;
  14         unsigned char nh_sel;
  15         unsigned char type;
  16         unsigned char scope;
  17 };
  18
  19 struct dn_fib_nh {
  20         struct net_device       *nh_dev;
  21         unsigned int            nh_flags;
  22         unsigned char           nh_scope;
  23         int                     nh_weight;
  24         int                     nh_power;
  25         int                     nh_oif;
  26         __le16                  nh_gw;
  27 };
  28
  29 struct dn_fib_info {
  30         struct dn_fib_info      *fib_next;
  31         struct dn_fib_info      *fib_prev;
  32         int                     fib_treeref;
  33         refcount_t              fib_clntref;
  34         int                     fib_dead;
  35         unsigned int            fib_flags;
  36         int                     fib_protocol;
  37         __le16                  fib_prefsrc;
  38         __u32                   fib_priority;
  39         __u32                   fib_metrics[RTAX_MAX];
  40         int                     fib_nhs;
  41         int                     fib_power;
  42         struct dn_fib_nh        fib_nh[0];
  43 #define dn_fib_dev              fib_nh[0].nh_dev
  44 };
  45
  46
  47 #define DN_FIB_RES_RESET(res)   ((res).nh_sel = 0)
  48 #define DN_FIB_RES_NH(res)      ((res).fi->fib_nh[(res).nh_sel])
  49
  50 #define DN_FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __dn_fib_res_prefsrc(&res))
  51 #define DN_FIB_RES_GW(res)      (DN_FIB_RES_NH(res).nh_gw)
  52 #define DN_FIB_RES_DEV(res)     (DN_FIB_RES_NH(res).nh_dev)
  53 #define DN_FIB_RES_OIF(res)     (DN_FIB_RES_NH(res).nh_oif)
  54
  55 typedef struct {
  56         __le16  datum;
  57 } dn_fib_key_t;
  58
  59 typedef struct {
  60         __le16  datum;
  61 } dn_fib_hash_t;
  62
  63 typedef struct {
  64         __u16   datum;
  65 } dn_fib_idx_t;
  66
  67 struct dn_fib_node {
  68         struct dn_fib_node *fn_next;
  69         struct dn_fib_info *fn_info;
  70 #define DN_FIB_INFO(f) ((f)->fn_info)
  71         dn_fib_key_t    fn_key;
  72         u8              fn_type;
  73         u8              fn_scope;
  74         u8              fn_state;
  75 };
  76
  77
  78 struct dn_fib_table {
  79         struct hlist_node hlist;
  80         u32 n;
  81
  82         int (*insert)(struct dn_fib_table *t, struct rtmsg *r,
  83                         struct nlattr *attrs[], struct nlmsghdr *n,
  84                         struct netlink_skb_parms *req);
  85         int (*delete)(struct dn_fib_table *t, struct rtmsg *r,
  86                         struct nlattr *attrs[], struct nlmsghdr *n,
  87                         struct netlink_skb_parms *req);
  88         int (*lookup)(struct dn_fib_table *t, const struct flowidn *fld,
  89                         struct dn_fib_res *res);
  90         int (*flush)(struct dn_fib_table *t);
  91         int (*dump)(struct dn_fib_table *t, struct sk_buff *skb, struct netlink_callback *cb);
  92
  93         unsigned char data[0];
  94 };
  95
  96 #ifdef CONFIG_DECNET_ROUTER
  97 /*
  98  * dn_fib.c
  99  */
 100 void dn_fib_init(void);
 101 void dn_fib_cleanup(void);
 102
 103 int dn_fib_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 104 struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r,
 105                                        struct nlattr *attrs[],
 106                                        const struct nlmsghdr *nlh, int *errp);
 107 int dn_fib_semantic_match(int type, struct dn_fib_info *fi,
 108                           const struct flowidn *fld, struct dn_fib_res *res);
 109 void dn_fib_release_info(struct dn_fib_info *fi);
 110 void dn_fib_flush(void);
 111 void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res);
 112
 113 /*
 114  * dn_tables.c
 115  */
 116 struct dn_fib_table *dn_fib_get_table(u32 n, int creat);
 117 struct dn_fib_table *dn_fib_empty_table(void);
 118 void dn_fib_table_init(void);
 119 void dn_fib_table_cleanup(void);
 120
 121 /*
 122  * dn_rules.c
 123  */
 124 void dn_fib_rules_init(void);
 125 void dn_fib_rules_cleanup(void);
 126 unsigned int dnet_addr_type(__le16 addr);
 127 int dn_fib_lookup(struct flowidn *fld, struct dn_fib_res *res);
 128
 129 int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb);
 130
 131 void dn_fib_free_info(struct dn_fib_info *fi);
 132
 133 static inline void dn_fib_info_put(struct dn_fib_info *fi)
 134 {
 135         if (refcount_dec_and_test(&fi->fib_clntref))
 136                 dn_fib_free_info(fi);
 137 }
 138
 139 static inline void dn_fib_res_put(struct dn_fib_res *res)
 140 {
 141         if (res->fi)
 142                 dn_fib_info_put(res->fi);
 143         if (res->r)
 144                 fib_rule_put(res->r);
 145 }
 146
 147 #else /* Endnode */
 148
 149 #define dn_fib_init()  do { } while(0)
 150 #define dn_fib_cleanup() do { } while(0)
 151
 152 #define dn_fib_lookup(fl, res) (-ESRCH)
 153 #define dn_fib_info_put(fi) do { } while(0)
 154 #define dn_fib_select_multipath(fl, res) do { } while(0)
 155 #define dn_fib_rules_policy(saddr,res,flags) (0)
 156 #define dn_fib_res_put(res) do { } while(0)
 157
 158 #endif /* CONFIG_DECNET_ROUTER */
 159
 160 static inline __le16 dnet_make_mask(int n)
 161 {
 162         if (n)
 163                 return cpu_to_le16(~((1 << (16 - n)) - 1));
 164         return cpu_to_le16(0);
 165 }
 166
 167 #endif /* _NET_DN_FIB_H */