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