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ip6_fib.h
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1 /*
2  * Linux INET6 implementation
3  *
4  * Authors:
5  * Pedro Roque <[email protected]>
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  u32 fc_type; /* only 8 bits are used */
41 
42  struct in6_addr fc_dst;
43  struct in6_addr fc_src;
44  struct in6_addr fc_prefsrc;
45  struct in6_addr fc_gateway;
46 
47  unsigned long fc_expires;
48  struct nlattr *fc_mx;
49  int fc_mx_len;
50 
51  struct nl_info fc_nlinfo;
52 };
53 
54 struct fib6_node {
55  struct fib6_node *parent;
56  struct fib6_node *left;
57  struct fib6_node *right;
58 #ifdef CONFIG_IPV6_SUBTREES
59  struct fib6_node *subtree;
60 #endif
61  struct rt6_info *leaf;
62 
63  __u16 fn_bit; /* bit key */
64  __u16 fn_flags;
65  __u32 fn_sernum;
66  struct rt6_info *rr_ptr;
67 };
68 
69 #ifndef CONFIG_IPV6_SUBTREES
70 #define FIB6_SUBTREE(fn) NULL
71 #else
72 #define FIB6_SUBTREE(fn) ((fn)->subtree)
73 #endif
74 
75 /*
76  * routing information
77  *
78  */
79 
80 struct rt6key {
81  struct in6_addr addr;
82  int plen;
83 };
84 
85 struct fib6_table;
86 
87 struct rt6_info {
88  struct dst_entry dst;
89 
90  struct neighbour *n;
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  unsigned long _rt6i_peer;
114 
115  u32 rt6i_genid;
116 
117  /* more non-fragment space at head required */
118  unsigned short rt6i_nfheader_len;
119 
120  u8 rt6i_protocol;
121 };
122 
123 static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
124 {
125  return inetpeer_ptr(rt->_rt6i_peer);
126 }
127 
128 static inline bool rt6_has_peer(struct rt6_info *rt)
129 {
130  return inetpeer_ptr_is_peer(rt->_rt6i_peer);
131 }
132 
133 static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
134 {
135  __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
136 }
137 
138 static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
139 {
140  return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
141 }
142 
143 static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
144 {
145  inetpeer_init_ptr(&rt->_rt6i_peer, base);
146 }
147 
148 static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
149 {
150  inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
151 }
152 
153 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
154 {
155  return ((struct rt6_info *)dst)->rt6i_idev;
156 }
157 
158 static inline void rt6_clean_expires(struct rt6_info *rt)
159 {
160  if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
161  dst_release(rt->dst.from);
162 
163  rt->rt6i_flags &= ~RTF_EXPIRES;
164  rt->dst.from = NULL;
165 }
166 
167 static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
168 {
169  if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
170  dst_release(rt->dst.from);
171 
172  rt->rt6i_flags |= RTF_EXPIRES;
173  rt->dst.expires = expires;
174 }
175 
176 static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
177 {
178  if (!(rt->rt6i_flags & RTF_EXPIRES)) {
179  if (rt->dst.from)
180  dst_release(rt->dst.from);
181  /* dst_set_expires relies on expires == 0
182  * if it has not been set previously.
183  */
184  rt->dst.expires = 0;
185  }
186 
187  dst_set_expires(&rt->dst, timeout);
188  rt->rt6i_flags |= RTF_EXPIRES;
189 }
190 
191 static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
192 {
193  struct dst_entry *new = (struct dst_entry *) from;
194 
195  if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
196  if (new == rt->dst.from)
197  return;
198  dst_release(rt->dst.from);
199  }
200 
201  rt->rt6i_flags &= ~RTF_EXPIRES;
202  rt->dst.from = new;
203  dst_hold(new);
204 }
205 
206 struct fib6_walker_t {
207  struct list_head lh;
208  struct fib6_node *root, *node;
209  struct rt6_info *leaf;
210  unsigned char state;
211  unsigned char prune;
212  unsigned int skip;
213  unsigned int count;
214  int (*func)(struct fib6_walker_t *);
215  void *args;
216 };
217 
218 struct rt6_statistics {
219  __u32 fib_nodes;
220  __u32 fib_route_nodes;
221  __u32 fib_rt_alloc; /* permanent routes */
222  __u32 fib_rt_entries; /* rt entries in table */
223  __u32 fib_rt_cache; /* cache routes */
224  __u32 fib_discarded_routes;
225 };
226 
227 #define RTN_TL_ROOT 0x0001
228 #define RTN_ROOT 0x0002 /* tree root node */
229 #define RTN_RTINFO 0x0004 /* node with valid routing info */
230 
231 /*
232  * priority levels (or metrics)
233  *
234  */
235 
236 
237 struct fib6_table {
238  struct hlist_node tb6_hlist;
239  u32 tb6_id;
240  rwlock_t tb6_lock;
241  struct fib6_node tb6_root;
242  struct inet_peer_base tb6_peers;
243 };
244 
245 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
246 #define RT6_TABLE_MAIN RT_TABLE_MAIN
247 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
248 #define RT6_TABLE_INFO RT6_TABLE_MAIN
249 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
250 
251 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
252 #define FIB6_TABLE_MIN 1
253 #define FIB6_TABLE_MAX RT_TABLE_MAX
254 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
255 #else
256 #define FIB6_TABLE_MIN RT_TABLE_MAIN
257 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
258 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
259 #endif
260 
261 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
262  struct fib6_table *,
263  struct flowi6 *, int);
264 
265 /*
266  * exported functions
267  */
268 
269 extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
270 extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
271 extern struct dst_entry *fib6_rule_lookup(struct net *net,
272  struct flowi6 *fl6, int flags,
273  pol_lookup_t lookup);
274 
275 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
276  const struct in6_addr *daddr,
277  const struct in6_addr *saddr);
278 
279 struct fib6_node *fib6_locate(struct fib6_node *root,
280  const struct in6_addr *daddr, int dst_len,
281  const struct in6_addr *saddr, int src_len);
282 
283 extern void fib6_clean_all_ro(struct net *net,
284  int (*func)(struct rt6_info *, void *arg),
285  int prune, void *arg);
286 
287 extern void fib6_clean_all(struct net *net,
288  int (*func)(struct rt6_info *, void *arg),
289  int prune, void *arg);
290 
291 extern int fib6_add(struct fib6_node *root,
292  struct rt6_info *rt,
293  struct nl_info *info);
294 
295 extern int fib6_del(struct rt6_info *rt,
296  struct nl_info *info);
297 
298 extern void inet6_rt_notify(int event, struct rt6_info *rt,
299  struct nl_info *info);
300 
301 extern void fib6_run_gc(unsigned long expires,
302  struct net *net);
303 
304 extern void fib6_gc_cleanup(void);
305 
306 extern int fib6_init(void);
307 
308 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
309 extern int fib6_rules_init(void);
310 extern void fib6_rules_cleanup(void);
311 #else
312 static inline int fib6_rules_init(void)
313 {
314  return 0;
315 }
316 static inline void fib6_rules_cleanup(void)
317 {
318  return ;
319 }
320 #endif
321 #endif
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