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 #include <linux/ipv6_route.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/spinlock.h>
19 #include <net/dst.h>
20 #include <net/flow.h>
21 #include <net/netlink.h>
22 #include <net/inetpeer.h>
23
24 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
25 #define FIB6_TABLE_HASHSZ 256
26 #else
27 #define FIB6_TABLE_HASHSZ 1
28 #endif
29
30 struct rt6_info;
31
32 struct fib6_config {
33 u32 fc_table;
34 u32 fc_metric;
35 int fc_dst_len;
36 int fc_src_len;
37 int fc_ifindex;
38 u32 fc_flags;
39 u32 fc_protocol;
40
41 struct in6_addr fc_dst;
42 struct in6_addr fc_src;
43 struct in6_addr fc_prefsrc;
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 struct dst_entry dst;
88
89 /*
90 * Tail elements of dst_entry (__refcnt etc.)
91 * and these elements (rarely used in hot path) are in
92 * the same cache line.
93 */
94 struct fib6_table *rt6i_table;
95 struct fib6_node *rt6i_node;
96
97 struct in6_addr rt6i_gateway;
98
99 atomic_t rt6i_ref;
100
101 /* These are in a separate cache line. */
102 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
103 u32 rt6i_flags;
104 struct rt6key rt6i_src;
105 struct rt6key rt6i_prefsrc;
106 u32 rt6i_metric;
107 u32 rt6i_peer_genid;
108
109 struct inet6_dev *rt6i_idev;
110 struct inet_peer *rt6i_peer;
111
112 #ifdef CONFIG_XFRM
113 u32 rt6i_flow_cache_genid;
114 #endif
115 /* more non-fragment space at head required */
116 unsigned short rt6i_nfheader_len;
117
118 u8 rt6i_protocol;
119 };
120
ip6_dst_idev(struct dst_entry * dst)121 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
122 {
123 return ((struct rt6_info *)dst)->rt6i_idev;
124 }
125
rt6_clean_expires(struct rt6_info * rt)126 static inline void rt6_clean_expires(struct rt6_info *rt)
127 {
128 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
129 dst_release(rt->dst.from);
130
131 rt->rt6i_flags &= ~RTF_EXPIRES;
132 rt->dst.from = NULL;
133 }
134
rt6_set_expires(struct rt6_info * rt,unsigned long expires)135 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
136 {
137 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
138 dst_release(rt->dst.from);
139
140 rt->rt6i_flags |= RTF_EXPIRES;
141 rt->dst.expires = expires;
142 }
143
rt6_update_expires(struct rt6_info * rt,int timeout)144 static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
145 {
146 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
147 if (rt->dst.from)
148 dst_release(rt->dst.from);
149 /* dst_set_expires relies on expires == 0
150 * if it has not been set previously.
151 */
152 rt->dst.expires = 0;
153 }
154
155 dst_set_expires(&rt->dst, timeout);
156 rt->rt6i_flags |= RTF_EXPIRES;
157 }
158
rt6_set_from(struct rt6_info * rt,struct rt6_info * from)159 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
160 {
161 struct dst_entry *new = (struct dst_entry *) from;
162
163 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
164 if (new == rt->dst.from)
165 return;
166 dst_release(rt->dst.from);
167 }
168
169 rt->rt6i_flags &= ~RTF_EXPIRES;
170 rt->dst.from = new;
171 dst_hold(new);
172 }
173
174 struct fib6_walker_t {
175 struct list_head lh;
176 struct fib6_node *root, *node;
177 struct rt6_info *leaf;
178 unsigned char state;
179 unsigned char prune;
180 unsigned int skip;
181 unsigned int count;
182 int (*func)(struct fib6_walker_t *);
183 void *args;
184 };
185
186 struct rt6_statistics {
187 __u32 fib_nodes;
188 __u32 fib_route_nodes;
189 __u32 fib_rt_alloc; /* permanent routes */
190 __u32 fib_rt_entries; /* rt entries in table */
191 __u32 fib_rt_cache; /* cache routes */
192 __u32 fib_discarded_routes;
193 };
194
195 #define RTN_TL_ROOT 0x0001
196 #define RTN_ROOT 0x0002 /* tree root node */
197 #define RTN_RTINFO 0x0004 /* node with valid routing info */
198
199 /*
200 * priority levels (or metrics)
201 *
202 */
203
204
205 struct fib6_table {
206 struct hlist_node tb6_hlist;
207 u32 tb6_id;
208 rwlock_t tb6_lock;
209 struct fib6_node tb6_root;
210 };
211
212 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
213 #define RT6_TABLE_MAIN RT_TABLE_MAIN
214 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
215 #define RT6_TABLE_INFO RT6_TABLE_MAIN
216 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
217
218 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
219 #define FIB6_TABLE_MIN 1
220 #define FIB6_TABLE_MAX RT_TABLE_MAX
221 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
222 #else
223 #define FIB6_TABLE_MIN RT_TABLE_MAIN
224 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
225 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
226 #endif
227
228 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
229 struct fib6_table *,
230 struct flowi6 *, int);
231
232 /*
233 * exported functions
234 */
235
236 extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
237 extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
238 extern struct dst_entry *fib6_rule_lookup(struct net *net,
239 struct flowi6 *fl6, int flags,
240 pol_lookup_t lookup);
241
242 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
243 const struct in6_addr *daddr,
244 const struct in6_addr *saddr);
245
246 struct fib6_node *fib6_locate(struct fib6_node *root,
247 const struct in6_addr *daddr, int dst_len,
248 const struct in6_addr *saddr, int src_len);
249
250 extern void fib6_clean_all_ro(struct net *net,
251 int (*func)(struct rt6_info *, void *arg),
252 int prune, void *arg);
253
254 extern void fib6_clean_all(struct net *net,
255 int (*func)(struct rt6_info *, void *arg),
256 int prune, void *arg);
257
258 extern int fib6_add(struct fib6_node *root,
259 struct rt6_info *rt,
260 struct nl_info *info);
261
262 extern int fib6_del(struct rt6_info *rt,
263 struct nl_info *info);
264
265 extern void inet6_rt_notify(int event, struct rt6_info *rt,
266 struct nl_info *info);
267
268 extern void fib6_run_gc(unsigned long expires,
269 struct net *net);
270
271 extern void fib6_gc_cleanup(void);
272
273 extern int fib6_init(void);
274
275 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
276 extern int fib6_rules_init(void);
277 extern void fib6_rules_cleanup(void);
278 #else
fib6_rules_init(void)279 static inline int fib6_rules_init(void)
280 {
281 return 0;
282 }
fib6_rules_cleanup(void)283 static inline void fib6_rules_cleanup(void)
284 {
285 return ;
286 }
287 #endif
288 #endif
289