include/net/dn_fib.h

   1 #ifndef _NET_DN_FIB_H
   2 #define _NET_DN_FIB_H
   3
   4 /* WARNING: The ordering of these elements must match ordering
   5  *          of RTA_* rtnetlink attribute numbers.
   6  */
   7 struct dn_kern_rta {
   8         void            *rta_dst;
   9         void            *rta_src;
  10         int             *rta_iif;
  11         int             *rta_oif;
  12         void            *rta_gw;
  13         u32             *rta_priority;
  14         void            *rta_prefsrc;
  15         struct rtattr   *rta_mx;
  16         struct rtattr   *rta_mp;
  17         unsigned char   *rta_protoinfo;
  18         u32             *rta_flow;
  19         struct rta_cacheinfo *rta_ci;
  20         struct rta_session *rta_sess;
  21 };
  22
  23 struct dn_fib_res {
  24         struct fib_rule *r;
  25         struct dn_fib_info *fi;
  26         unsigned char prefixlen;
  27         unsigned char nh_sel;
  28         unsigned char type;
  29         unsigned char scope;
  30 };
  31
  32 struct dn_fib_nh {
  33         struct net_device       *nh_dev;
  34         unsigned                nh_flags;
  35         unsigned char           nh_scope;
  36         int                     nh_weight;
  37         int                     nh_power;
  38         int                     nh_oif;
  39         __le16                  nh_gw;
  40 };
  41
  42 struct dn_fib_info {
  43         struct dn_fib_info      *fib_next;
  44         struct dn_fib_info      *fib_prev;
  45         int                     fib_treeref;
  46         atomic_t                fib_clntref;
  47         int                     fib_dead;
  48         unsigned                fib_flags;
  49         int                     fib_protocol;
  50         __le16                  fib_prefsrc;
  51         __u32                   fib_priority;
  52         __u32                   fib_metrics[RTAX_MAX];
  53 #define dn_fib_mtu  fib_metrics[RTAX_MTU-1]
  54 #define dn_fib_window fib_metrics[RTAX_WINDOW-1]
  55 #define dn_fib_rtt fib_metrics[RTAX_RTT-1]
  56 #define dn_fib_advmss fib_metrics[RTAX_ADVMSS-1]
  57         int                     fib_nhs;
  58         int                     fib_power;
  59         struct dn_fib_nh        fib_nh[0];
  60 #define dn_fib_dev              fib_nh[0].nh_dev
  61 };
  62
  63
  64 #define DN_FIB_RES_RESET(res)   ((res).nh_sel = 0)
  65 #define DN_FIB_RES_NH(res)      ((res).fi->fib_nh[(res).nh_sel])
  66
  67 #define DN_FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __dn_fib_res_prefsrc(&res))
  68 #define DN_FIB_RES_GW(res)      (DN_FIB_RES_NH(res).nh_gw)
  69 #define DN_FIB_RES_DEV(res)     (DN_FIB_RES_NH(res).nh_dev)
  70 #define DN_FIB_RES_OIF(res)     (DN_FIB_RES_NH(res).nh_oif)
  71
  72 typedef struct {
  73         __le16  datum;
  74 } dn_fib_key_t;
  75
  76 typedef struct {
  77         __le16  datum;
  78 } dn_fib_hash_t;
  79
  80 typedef struct {
  81         __u16   datum;
  82 } dn_fib_idx_t;
  83
  84 struct dn_fib_node {
  85         struct dn_fib_node *fn_next;
  86         struct dn_fib_info *fn_info;
  87 #define DN_FIB_INFO(f) ((f)->fn_info)
  88         dn_fib_key_t    fn_key;
  89         u8              fn_type;
  90         u8              fn_scope;
  91         u8              fn_state;
  92 };
  93
  94
  95 struct dn_fib_table {
  96         struct hlist_node hlist;
  97         u32 n;
  98
  99         int (*insert)(struct dn_fib_table *t, struct rtmsg *r,
 100                         struct dn_kern_rta *rta, struct nlmsghdr *n,
 101                         struct netlink_skb_parms *req);
 102         int (*delete)(struct dn_fib_table *t, struct rtmsg *r,
 103                         struct dn_kern_rta *rta, struct nlmsghdr *n,
 104                         struct netlink_skb_parms *req);
 105         int (*lookup)(struct dn_fib_table *t, const struct flowi *fl,
 106                         struct dn_fib_res *res);
 107         int (*flush)(struct dn_fib_table *t);
 108         int (*dump)(struct dn_fib_table *t, struct sk_buff *skb, struct netlink_callback *cb);
 109
 110         unsigned char data[0];
 111 };
 112
 113 #ifdef CONFIG_DECNET_ROUTER
 114 /*
 115  * dn_fib.c
 116  */
 117 extern void dn_fib_init(void);
 118 extern void dn_fib_cleanup(void);
 119
 120 extern int dn_fib_ioctl(struct socket *sock, unsigned int cmd,
 121                         unsigned long arg);
 122 extern struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r,
 123                                 struct dn_kern_rta *rta,
 124                                 const struct nlmsghdr *nlh, int *errp);
 125 extern int dn_fib_semantic_match(int type, struct dn_fib_info *fi,
 126                         const struct flowi *fl,
 127                         struct dn_fib_res *res);
 128 extern void dn_fib_release_info(struct dn_fib_info *fi);
 129 extern __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type);
 130 extern void dn_fib_flush(void);
 131 extern void dn_fib_select_multipath(const struct flowi *fl,
 132                                         struct dn_fib_res *res);
 133
 134 /*
 135  * dn_tables.c
 136  */
 137 extern struct dn_fib_table *dn_fib_get_table(u32 n, int creat);
 138 extern struct dn_fib_table *dn_fib_empty_table(void);
 139 extern void dn_fib_table_init(void);
 140 extern void dn_fib_table_cleanup(void);
 141
 142 /*
 143  * dn_rules.c
 144  */
 145 extern void dn_fib_rules_init(void);
 146 extern void dn_fib_rules_cleanup(void);
 147 extern unsigned dnet_addr_type(__le16 addr);
 148 extern int dn_fib_lookup(struct flowi *fl, struct dn_fib_res *res);
 149
 150 extern int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb);
 151
 152 extern void dn_fib_free_info(struct dn_fib_info *fi);
 153
 154 static inline void dn_fib_info_put(struct dn_fib_info *fi)
 155 {
 156         if (atomic_dec_and_test(&fi->fib_clntref))
 157                 dn_fib_free_info(fi);
 158 }
 159
 160 static inline void dn_fib_res_put(struct dn_fib_res *res)
 161 {
 162         if (res->fi)
 163                 dn_fib_info_put(res->fi);
 164         if (res->r)
 165                 fib_rule_put(res->r);
 166 }
 167
 168 #else /* Endnode */
 169
 170 #define dn_fib_init()  do { } while(0)
 171 #define dn_fib_cleanup() do { } while(0)
 172
 173 #define dn_fib_lookup(fl, res) (-ESRCH)
 174 #define dn_fib_info_put(fi) do { } while(0)
 175 #define dn_fib_select_multipath(fl, res) do { } while(0)
 176 #define dn_fib_rules_policy(saddr,res,flags) (0)
 177 #define dn_fib_res_put(res) do { } while(0)
 178
 179 #endif /* CONFIG_DECNET_ROUTER */
 180
 181 static inline __le16 dnet_make_mask(int n)
 182 {
 183         if (n)
 184                 return cpu_to_le16(~((1 << (16 - n)) - 1));
 185         return cpu_to_le16(0);
 186 }
 187
 188 #endif /* _NET_DN_FIB_H */