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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
30struct rt6_info;
31
32struct 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
53struct 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
79struct rt6key {
80 struct in6_addr addr;
81 int plen;
82};
83
84struct fib6_table;
85
86struct rt6_info {
87 struct dst_entry dst;
88
89#define rt6i_dev dst.dev
90#define rt6i_expires dst.expires
91
92 /*
93 * Tail elements of dst_entry (__refcnt etc.)
94 * and these elements (rarely used in hot path) are in
95 * the same cache line.
96 */
97 struct fib6_table *rt6i_table;
98 struct fib6_node *rt6i_node;
99
100 struct in6_addr rt6i_gateway;
101
102 atomic_t rt6i_ref;
103
104 /* These are in a separate cache line. */
105 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
106 u32 rt6i_flags;
107 struct rt6key rt6i_src;
108 struct rt6key rt6i_prefsrc;
109 u32 rt6i_metric;
110 u32 rt6i_peer_genid;
111
112 struct inet6_dev *rt6i_idev;
113 struct inet_peer *rt6i_peer;
114
115#ifdef CONFIG_XFRM
116 u32 rt6i_flow_cache_genid;
117#endif
118 /* more non-fragment space at head required */
119 unsigned short rt6i_nfheader_len;
120
121 u8 rt6i_protocol;
122};
123
124static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
125{
126 return ((struct rt6_info *)dst)->rt6i_idev;
127}
128
129struct fib6_walker_t {
130 struct list_head lh;
131 struct fib6_node *root, *node;
132 struct rt6_info *leaf;
133 unsigned char state;
134 unsigned char prune;
135 unsigned int skip;
136 unsigned int count;
137 int (*func)(struct fib6_walker_t *);
138 void *args;
139};
140
141struct rt6_statistics {
142 __u32 fib_nodes;
143 __u32 fib_route_nodes;
144 __u32 fib_rt_alloc; /* permanent routes */
145 __u32 fib_rt_entries; /* rt entries in table */
146 __u32 fib_rt_cache; /* cache routes */
147 __u32 fib_discarded_routes;
148};
149
150#define RTN_TL_ROOT 0x0001
151#define RTN_ROOT 0x0002 /* tree root node */
152#define RTN_RTINFO 0x0004 /* node with valid routing info */
153
154/*
155 * priority levels (or metrics)
156 *
157 */
158
159
160struct fib6_table {
161 struct hlist_node tb6_hlist;
162 u32 tb6_id;
163 rwlock_t tb6_lock;
164 struct fib6_node tb6_root;
165};
166
167#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
168#define RT6_TABLE_MAIN RT_TABLE_MAIN
169#define RT6_TABLE_DFLT RT6_TABLE_MAIN
170#define RT6_TABLE_INFO RT6_TABLE_MAIN
171#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
172
173#ifdef CONFIG_IPV6_MULTIPLE_TABLES
174#define FIB6_TABLE_MIN 1
175#define FIB6_TABLE_MAX RT_TABLE_MAX
176#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
177#else
178#define FIB6_TABLE_MIN RT_TABLE_MAIN
179#define FIB6_TABLE_MAX FIB6_TABLE_MIN
180#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
181#endif
182
183typedef struct rt6_info *(*pol_lookup_t)(struct net *,
184 struct fib6_table *,
185 struct flowi6 *, int);
186
187/*
188 * exported functions
189 */
190
191extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
192extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
193extern struct dst_entry *fib6_rule_lookup(struct net *net,
194 struct flowi6 *fl6, int flags,
195 pol_lookup_t lookup);
196
197extern struct fib6_node *fib6_lookup(struct fib6_node *root,
198 const struct in6_addr *daddr,
199 const struct in6_addr *saddr);
200
201struct fib6_node *fib6_locate(struct fib6_node *root,
202 const struct in6_addr *daddr, int dst_len,
203 const struct in6_addr *saddr, int src_len);
204
205extern void fib6_clean_all(struct net *net,
206 int (*func)(struct rt6_info *, void *arg),
207 int prune, void *arg);
208
209extern int fib6_add(struct fib6_node *root,
210 struct rt6_info *rt,
211 struct nl_info *info);
212
213extern int fib6_del(struct rt6_info *rt,
214 struct nl_info *info);
215
216extern void inet6_rt_notify(int event, struct rt6_info *rt,
217 struct nl_info *info);
218
219extern void fib6_run_gc(unsigned long expires,
220 struct net *net);
221
222extern void fib6_gc_cleanup(void);
223
224extern int fib6_init(void);
225
226#ifdef CONFIG_IPV6_MULTIPLE_TABLES
227extern int fib6_rules_init(void);
228extern void fib6_rules_cleanup(void);
229#else
230static inline int fib6_rules_init(void)
231{
232 return 0;
233}
234static inline void fib6_rules_cleanup(void)
235{
236 return ;
237}
238#endif
239#endif
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
30struct rt6_info;
31
32struct 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
53struct 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
79struct rt6key {
80 struct in6_addr addr;
81 int plen;
82};
83
84struct fib6_table;
85
86struct 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
121static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
122{
123 return ((struct rt6_info *)dst)->rt6i_idev;
124}
125
126static 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
135static 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
144static 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
159static 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
174struct 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
186struct 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
205struct 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
228typedef struct rt6_info *(*pol_lookup_t)(struct net *,
229 struct fib6_table *,
230 struct flowi6 *, int);
231
232/*
233 * exported functions
234 */
235
236extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
237extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
238extern struct dst_entry *fib6_rule_lookup(struct net *net,
239 struct flowi6 *fl6, int flags,
240 pol_lookup_t lookup);
241
242extern struct fib6_node *fib6_lookup(struct fib6_node *root,
243 const struct in6_addr *daddr,
244 const struct in6_addr *saddr);
245
246struct 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
250extern void fib6_clean_all_ro(struct net *net,
251 int (*func)(struct rt6_info *, void *arg),
252 int prune, void *arg);
253
254extern void fib6_clean_all(struct net *net,
255 int (*func)(struct rt6_info *, void *arg),
256 int prune, void *arg);
257
258extern int fib6_add(struct fib6_node *root,
259 struct rt6_info *rt,
260 struct nl_info *info);
261
262extern int fib6_del(struct rt6_info *rt,
263 struct nl_info *info);
264
265extern void inet6_rt_notify(int event, struct rt6_info *rt,
266 struct nl_info *info);
267
268extern void fib6_run_gc(unsigned long expires,
269 struct net *net);
270
271extern void fib6_gc_cleanup(void);
272
273extern int fib6_init(void);
274
275#ifdef CONFIG_IPV6_MULTIPLE_TABLES
276extern int fib6_rules_init(void);
277extern void fib6_rules_cleanup(void);
278#else
279static inline int fib6_rules_init(void)
280{
281 return 0;
282}
283static inline void fib6_rules_cleanup(void)
284{
285 return ;
286}
287#endif
288#endif