LXR linux/include/net/dn

   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
   8extern const struct nla_policy rtm_dn_policy[];
   9
  10struct 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
  19struct 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
  29struct 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
  55typedef struct {
  56        __le16  datum;
  57} dn_fib_key_t;
  58
  59typedef struct {
  60        __le16  datum;
  61} dn_fib_hash_t;
  62
  63typedef struct {
  64        __u16   datum;
  65} dn_fib_idx_t;
  66
  67struct 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
  78struct 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 */
 100void dn_fib_init(void);
 101void dn_fib_cleanup(void);
 102
 103int dn_fib_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 104struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r,
 105                                       struct nlattr *attrs[],
 106                                       const struct nlmsghdr *nlh, int *errp);
 107int dn_fib_semantic_match(int type, struct dn_fib_info *fi,
 108                          const struct flowidn *fld, struct dn_fib_res *res);
 109void dn_fib_release_info(struct dn_fib_info *fi);
 110void dn_fib_flush(void);
 111void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res);
 112
 113/*
 114 * dn_tables.c
 115 */
 116struct dn_fib_table *dn_fib_get_table(u32 n, int creat);
 117struct dn_fib_table *dn_fib_empty_table(void);
 118void dn_fib_table_init(void);
 119void dn_fib_table_cleanup(void);
 120
 121/*
 122 * dn_rules.c
 123 */
 124void dn_fib_rules_init(void);
 125void dn_fib_rules_cleanup(void);
 126unsigned int dnet_addr_type(__le16 addr);
 127int dn_fib_lookup(struct flowidn *fld, struct dn_fib_res *res);
 128
 129int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb);
 130
 131void dn_fib_free_info(struct dn_fib_info *fi);
 132
 133static 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
 139static 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
 160static 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 */
 168