xref: /openbmc/linux/include/net/ip6_fib.h (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
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 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
26 #define FIB6_TABLE_HASHSZ 256
27 #else
28 #define FIB6_TABLE_HASHSZ 1
29 #endif
30 
31 struct rt6_info;
32 
33 struct fib6_config {
34 	u32		fc_table;
35 	u32		fc_metric;
36 	int		fc_dst_len;
37 	int		fc_src_len;
38 	int		fc_ifindex;
39 	u32		fc_flags;
40 	u32		fc_protocol;
41 
42 	struct in6_addr	fc_dst;
43 	struct in6_addr	fc_src;
44 	struct in6_addr	fc_gateway;
45 
46 	unsigned long	fc_expires;
47 	struct nlattr	*fc_mx;
48 	int		fc_mx_len;
49 
50 	struct nl_info	fc_nlinfo;
51 };
52 
53 struct fib6_node {
54 	struct fib6_node	*parent;
55 	struct fib6_node	*left;
56 	struct fib6_node	*right;
57 #ifdef CONFIG_IPV6_SUBTREES
58 	struct fib6_node	*subtree;
59 #endif
60 	struct rt6_info		*leaf;
61 
62 	__u16			fn_bit;		/* bit key */
63 	__u16			fn_flags;
64 	__u32			fn_sernum;
65 	struct rt6_info		*rr_ptr;
66 };
67 
68 #ifndef CONFIG_IPV6_SUBTREES
69 #define FIB6_SUBTREE(fn)	NULL
70 #else
71 #define FIB6_SUBTREE(fn)	((fn)->subtree)
72 #endif
73 
74 /*
75  *	routing information
76  *
77  */
78 
79 struct rt6key {
80 	struct in6_addr	addr;
81 	int		plen;
82 };
83 
84 struct fib6_table;
85 
86 struct rt6_info {
87 	union {
88 		struct dst_entry	dst;
89 	} u;
90 
91 	struct inet6_dev		*rt6i_idev;
92 
93 #define rt6i_dev			u.dst.dev
94 #define rt6i_nexthop			u.dst.neighbour
95 #define rt6i_expires			u.dst.expires
96 
97 	struct fib6_node		*rt6i_node;
98 
99 	struct in6_addr			rt6i_gateway;
100 
101 	u32				rt6i_flags;
102 	u32				rt6i_metric;
103 	atomic_t			rt6i_ref;
104 
105 	/* more non-fragment space at head required */
106 	unsigned short			rt6i_nfheader_len;
107 
108 	u8				rt6i_protocol;
109 
110 	struct fib6_table		*rt6i_table;
111 
112 	struct rt6key			rt6i_dst;
113 
114 #ifdef CONFIG_XFRM
115 	u32				rt6i_flow_cache_genid;
116 #endif
117 
118 	struct rt6key			rt6i_src;
119 };
120 
121 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
122 {
123 	return ((struct rt6_info *)dst)->rt6i_idev;
124 }
125 
126 struct fib6_walker_t {
127 	struct fib6_walker_t *prev, *next;
128 	struct fib6_node *root, *node;
129 	struct rt6_info *leaf;
130 	unsigned char state;
131 	unsigned char prune;
132 	int (*func)(struct fib6_walker_t *);
133 	void *args;
134 };
135 
136 struct rt6_statistics {
137 	__u32		fib_nodes;
138 	__u32		fib_route_nodes;
139 	__u32		fib_rt_alloc;		/* permanent routes	*/
140 	__u32		fib_rt_entries;		/* rt entries in table	*/
141 	__u32		fib_rt_cache;		/* cache routes		*/
142 	__u32		fib_discarded_routes;
143 };
144 
145 #define RTN_TL_ROOT	0x0001
146 #define RTN_ROOT	0x0002		/* tree root node		*/
147 #define RTN_RTINFO	0x0004		/* node with valid routing info	*/
148 
149 /*
150  *	priority levels (or metrics)
151  *
152  */
153 
154 
155 struct fib6_table {
156 	struct hlist_node	tb6_hlist;
157 	u32			tb6_id;
158 	rwlock_t		tb6_lock;
159 	struct fib6_node	tb6_root;
160 };
161 
162 #define RT6_TABLE_UNSPEC	RT_TABLE_UNSPEC
163 #define RT6_TABLE_MAIN		RT_TABLE_MAIN
164 #define RT6_TABLE_DFLT		RT6_TABLE_MAIN
165 #define RT6_TABLE_INFO		RT6_TABLE_MAIN
166 #define RT6_TABLE_PREFIX	RT6_TABLE_MAIN
167 
168 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
169 #define FIB6_TABLE_MIN		1
170 #define FIB6_TABLE_MAX		RT_TABLE_MAX
171 #define RT6_TABLE_LOCAL		RT_TABLE_LOCAL
172 #else
173 #define FIB6_TABLE_MIN		RT_TABLE_MAIN
174 #define FIB6_TABLE_MAX		FIB6_TABLE_MIN
175 #define RT6_TABLE_LOCAL		RT6_TABLE_MAIN
176 #endif
177 
178 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
179 					 struct fib6_table *,
180 					 struct flowi *, int);
181 
182 /*
183  *	exported functions
184  */
185 
186 extern struct fib6_table        *fib6_get_table(struct net *net, u32 id);
187 extern struct fib6_table        *fib6_new_table(struct net *net, u32 id);
188 extern struct dst_entry         *fib6_rule_lookup(struct net *net,
189 						  struct flowi *fl, int flags,
190 						  pol_lookup_t lookup);
191 
192 extern struct fib6_node		*fib6_lookup(struct fib6_node *root,
193 					     struct in6_addr *daddr,
194 					     struct in6_addr *saddr);
195 
196 struct fib6_node		*fib6_locate(struct fib6_node *root,
197 					     struct in6_addr *daddr, int dst_len,
198 					     struct in6_addr *saddr, int src_len);
199 
200 extern void			fib6_clean_all(struct net *net,
201 					       int (*func)(struct rt6_info *, void *arg),
202 					       int prune, void *arg);
203 
204 extern int			fib6_add(struct fib6_node *root,
205 					 struct rt6_info *rt,
206 					 struct nl_info *info);
207 
208 extern int			fib6_del(struct rt6_info *rt,
209 					 struct nl_info *info);
210 
211 extern void			inet6_rt_notify(int event, struct rt6_info *rt,
212 						struct nl_info *info);
213 
214 extern void			fib6_run_gc(unsigned long expires,
215 					    struct net *net);
216 
217 extern void			fib6_gc_cleanup(void);
218 
219 extern int			fib6_init(void);
220 
221 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
222 extern int			fib6_rules_init(void);
223 extern void			fib6_rules_cleanup(void);
224 #else
225 static inline int               fib6_rules_init(void)
226 {
227 	return 0;
228 }
229 static inline void              fib6_rules_cleanup(void)
230 {
231 	return ;
232 }
233 #endif
234 #endif
235 #endif
236