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 dn_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         int 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 extern int dn_fib_sync_down(__le16 local, struct net_device *dev,
 134                                 int force);
 135 extern int dn_fib_sync_up(struct net_device *dev);
 136
 137 /*
 138  * dn_tables.c
 139  */
 140 extern struct dn_fib_table *dn_fib_get_table(int n, int creat);
 141 extern struct dn_fib_table *dn_fib_empty_table(void);
 142 extern void dn_fib_table_init(void);
 143 extern void dn_fib_table_cleanup(void);
 144
 145 /*
 146  * dn_rules.c
 147  */
 148 extern void dn_fib_rules_init(void);
 149 extern void dn_fib_rules_cleanup(void);
 150 extern void dn_fib_rule_put(struct dn_fib_rule *);
 151 extern __le16 dn_fib_rules_policy(__le16 saddr, struct dn_fib_res *res, unsigned *flags);
 152 extern unsigned dnet_addr_type(__le16 addr);
 153 extern int dn_fib_lookup(const struct flowi *fl, struct dn_fib_res *res);
 154
 155 /*
 156  * rtnetlink interface
 157  */
 158 extern int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
 159 extern int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
 160 extern int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb);
 161
 162 extern int dn_fib_rtm_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
 163 extern int dn_fib_rtm_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
 164 extern int dn_fib_dump_rules(struct sk_buff *skb, struct netlink_callback *cb);
 165
 166 extern void dn_fib_free_info(struct dn_fib_info *fi);
 167
 168 static inline void dn_fib_info_put(struct dn_fib_info *fi)
 169 {
 170         if (atomic_dec_and_test(&fi->fib_clntref))
 171                 dn_fib_free_info(fi);
 172 }
 173
 174 static inline void dn_fib_res_put(struct dn_fib_res *res)
 175 {
 176         if (res->fi)
 177                 dn_fib_info_put(res->fi);
 178         if (res->r)
 179                 dn_fib_rule_put(res->r);
 180 }
 181
 182 extern struct dn_fib_table *dn_fib_tables[];
 183
 184 #else /* Endnode */
 185
 186 #define dn_fib_init()  do { } while(0)
 187 #define dn_fib_cleanup() do { } while(0)
 188
 189 #define dn_fib_lookup(fl, res) (-ESRCH)
 190 #define dn_fib_info_put(fi) do { } while(0)
 191 #define dn_fib_select_multipath(fl, res) do { } while(0)
 192 #define dn_fib_rules_policy(saddr,res,flags) (0)
 193 #define dn_fib_res_put(res) do { } while(0)
 194
 195 #endif /* CONFIG_DECNET_ROUTER */
 196
 197 static inline __le16 dnet_make_mask(int n)
 198 {
 199         if (n)
 200                 return dn_htons(~((1<<(16-n))-1));
 201         return 0;
 202 }
 203
 204 #endif /* _NET_DN_FIB_H */