xref: /openbmc/linux/include/net/ip6_fib.h (revision a1e58bbd)
1 /*
2  *	Linux INET6 implementation
3  *
4  *	Authors:
5  *	Pedro Roque		<roque@di.fc.ul.pt>
6  *
7  *	This program is free software; you can redistribute it and/or
8  *      modify it under the terms of the GNU General Public License
9  *      as published by the Free Software Foundation; either version
10  *      2 of the License, or (at your option) any later version.
11  */
12 
13 #ifndef _IP6_FIB_H
14 #define _IP6_FIB_H
15 
16 #ifdef __KERNEL__
17 
18 #include <linux/ipv6_route.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/spinlock.h>
21 #include <net/dst.h>
22 #include <net/flow.h>
23 #include <net/netlink.h>
24 
25 struct rt6_info;
26 
27 struct fib6_config
28 {
29 	u32		fc_table;
30 	u32		fc_metric;
31 	int		fc_dst_len;
32 	int		fc_src_len;
33 	int		fc_ifindex;
34 	u32		fc_flags;
35 	u32		fc_protocol;
36 
37 	struct in6_addr	fc_dst;
38 	struct in6_addr	fc_src;
39 	struct in6_addr	fc_gateway;
40 
41 	unsigned long	fc_expires;
42 	struct nlattr	*fc_mx;
43 	int		fc_mx_len;
44 
45 	struct nl_info	fc_nlinfo;
46 };
47 
48 struct fib6_node
49 {
50 	struct fib6_node	*parent;
51 	struct fib6_node	*left;
52 	struct fib6_node	*right;
53 #ifdef CONFIG_IPV6_SUBTREES
54 	struct fib6_node	*subtree;
55 #endif
56 	struct rt6_info		*leaf;
57 
58 	__u16			fn_bit;		/* bit key */
59 	__u16			fn_flags;
60 	__u32			fn_sernum;
61 	struct rt6_info		*rr_ptr;
62 };
63 
64 #ifndef CONFIG_IPV6_SUBTREES
65 #define FIB6_SUBTREE(fn)	NULL
66 #else
67 #define FIB6_SUBTREE(fn)	((fn)->subtree)
68 #endif
69 
70 /*
71  *	routing information
72  *
73  */
74 
75 struct rt6key
76 {
77 	struct in6_addr	addr;
78 	int		plen;
79 };
80 
81 struct fib6_table;
82 
83 struct rt6_info
84 {
85 	union {
86 		struct dst_entry	dst;
87 	} u;
88 
89 	struct inet6_dev		*rt6i_idev;
90 
91 #define rt6i_dev			u.dst.dev
92 #define rt6i_nexthop			u.dst.neighbour
93 #define rt6i_expires			u.dst.expires
94 
95 	struct fib6_node		*rt6i_node;
96 
97 	struct in6_addr			rt6i_gateway;
98 
99 	u32				rt6i_flags;
100 	u32				rt6i_metric;
101 	atomic_t			rt6i_ref;
102 
103 	/* more non-fragment space at head required */
104 	unsigned short			rt6i_nfheader_len;
105 
106 	u8				rt6i_protocol;
107 
108 	struct fib6_table		*rt6i_table;
109 
110 	struct rt6key			rt6i_dst;
111 
112 #ifdef CONFIG_XFRM
113 	u32				rt6i_flow_cache_genid;
114 #endif
115 
116 	struct rt6key			rt6i_src;
117 };
118 
119 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
120 {
121 	return ((struct rt6_info *)dst)->rt6i_idev;
122 }
123 
124 struct fib6_walker_t
125 {
126 	struct fib6_walker_t *prev, *next;
127 	struct fib6_node *root, *node;
128 	struct rt6_info *leaf;
129 	unsigned char state;
130 	unsigned char prune;
131 	int (*func)(struct fib6_walker_t *);
132 	void *args;
133 };
134 
135 struct rt6_statistics {
136 	__u32		fib_nodes;
137 	__u32		fib_route_nodes;
138 	__u32		fib_rt_alloc;		/* permanent routes	*/
139 	__u32		fib_rt_entries;		/* rt entries in table	*/
140 	__u32		fib_rt_cache;		/* cache routes		*/
141 	__u32		fib_discarded_routes;
142 };
143 
144 #define RTN_TL_ROOT	0x0001
145 #define RTN_ROOT	0x0002		/* tree root node		*/
146 #define RTN_RTINFO	0x0004		/* node with valid routing info	*/
147 
148 /*
149  *	priority levels (or metrics)
150  *
151  */
152 
153 
154 struct fib6_table {
155 	struct hlist_node	tb6_hlist;
156 	u32			tb6_id;
157 	rwlock_t		tb6_lock;
158 	struct fib6_node	tb6_root;
159 };
160 
161 #define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC
162 #define RT6_TABLE_MAIN		RT_TABLE_MAIN
163 #define RT6_TABLE_DFLT		RT6_TABLE_MAIN
164 #define RT6_TABLE_INFO		RT6_TABLE_MAIN
165 #define RT6_TABLE_PREFIX	RT6_TABLE_MAIN
166 
167 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
168 #define FIB6_TABLE_MIN		1
169 #define FIB6_TABLE_MAX		RT_TABLE_MAX
170 #define RT6_TABLE_LOCAL		RT_TABLE_LOCAL
171 #else
172 #define FIB6_TABLE_MIN		RT_TABLE_MAIN
173 #define FIB6_TABLE_MAX		FIB6_TABLE_MIN
174 #define RT6_TABLE_LOCAL		RT6_TABLE_MAIN
175 #endif
176 
177 typedef struct rt6_info *(*pol_lookup_t)(struct fib6_table *,
178 					 struct flowi *, int);
179 
180 /*
181  *	exported functions
182  */
183 
184 extern struct fib6_table *	fib6_get_table(u32 id);
185 extern struct fib6_table *	fib6_new_table(u32 id);
186 extern struct dst_entry *	fib6_rule_lookup(struct flowi *fl, int flags,
187 						 pol_lookup_t lookup);
188 
189 extern struct fib6_node		*fib6_lookup(struct fib6_node *root,
190 					     struct in6_addr *daddr,
191 					     struct in6_addr *saddr);
192 
193 struct fib6_node		*fib6_locate(struct fib6_node *root,
194 					     struct in6_addr *daddr, int dst_len,
195 					     struct in6_addr *saddr, int src_len);
196 
197 extern void			fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
198 					       int prune, void *arg);
199 
200 extern int			fib6_add(struct fib6_node *root,
201 					 struct rt6_info *rt,
202 					 struct nl_info *info);
203 
204 extern int			fib6_del(struct rt6_info *rt,
205 					 struct nl_info *info);
206 
207 extern void			inet6_rt_notify(int event, struct rt6_info *rt,
208 						struct nl_info *info);
209 
210 extern void			fib6_run_gc(unsigned long dummy);
211 
212 extern void			fib6_gc_cleanup(void);
213 
214 extern int			fib6_init(void);
215 
216 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
217 extern int			fib6_rules_init(void);
218 extern void			fib6_rules_cleanup(void);
219 #else
220 static inline int               fib6_rules_init(void)
221 {
222 	return 0;
223 }
224 static inline void              fib6_rules_cleanup(void)
225 {
226 	return ;
227 }
228 #endif
229 #endif
230 #endif
231