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 */