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
8 extern const struct nla_policy rtm_dn_policy[];
9
10 struct 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
19 struct 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
29 struct 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
55 typedef struct {
56 __le16 datum;
57 } dn_fib_key_t;
58
59 typedef struct {
60 __le16 datum;
61 } dn_fib_hash_t;
62
63 typedef struct {
64 __u16 datum;
65 } dn_fib_idx_t;
66
67 struct 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
78 struct 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[];
94 };
95
96 #ifdef CONFIG_DECNET_ROUTER
97 /*
98 * dn_fib.c
99 */
100 void dn_fib_init(void);
101 void dn_fib_cleanup(void);
102
103 int dn_fib_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
104 struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r,
105 struct nlattr *attrs[],
106 const struct nlmsghdr *nlh, int *errp);
107 int dn_fib_semantic_match(int type, struct dn_fib_info *fi,
108 const struct flowidn *fld, struct dn_fib_res *res);
109 void dn_fib_release_info(struct dn_fib_info *fi);
110 void dn_fib_flush(void);
111 void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res);
112
113 /*
114 * dn_tables.c
115 */
116 struct dn_fib_table *dn_fib_get_table(u32 n, int creat);
117 struct dn_fib_table *dn_fib_empty_table(void);
118 void dn_fib_table_init(void);
119 void dn_fib_table_cleanup(void);
120
121 /*
122 * dn_rules.c
123 */
124 void dn_fib_rules_init(void);
125 void dn_fib_rules_cleanup(void);
126 unsigned int dnet_addr_type(__le16 addr);
127 int dn_fib_lookup(struct flowidn *fld, struct dn_fib_res *res);
128
129 int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb);
130
131 void dn_fib_free_info(struct dn_fib_info *fi);
132
dn_fib_info_put(struct dn_fib_info * fi)133 static 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
dn_fib_res_put(struct dn_fib_res * res)139 static 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
dnet_make_mask(int n)160 static 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