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718e3744 | 1 | /* |
2 | * Routing Table | |
3 | * Copyright (C) 1998 Kunihiro Ishiguro | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
896014f4 DL |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
718e3744 | 20 | */ |
21 | ||
22 | #ifndef _ZEBRA_TABLE_H | |
23 | #define _ZEBRA_TABLE_H | |
24 | ||
4a1ab8e4 | 25 | #include "memory.h" |
bc7a2c03 | 26 | #include "hash.h" |
c0c22c2b | 27 | #include "prefix.h" |
4a1ab8e4 | 28 | DECLARE_MTYPE(ROUTE_TABLE) |
0964ad9c | 29 | DECLARE_MTYPE(ROUTE_NODE) |
4a1ab8e4 | 30 | |
f9c1b7bb AS |
31 | /* |
32 | * Forward declarations. | |
33 | */ | |
34 | struct route_node; | |
35 | struct route_table; | |
36 | ||
37 | /* | |
38 | * route_table_delegate_t | |
39 | * | |
40 | * Function vector that can be used by a client to customize the | |
41 | * behavior of one or more route tables. | |
42 | */ | |
43 | typedef struct route_table_delegate_t_ route_table_delegate_t; | |
44 | ||
d62a17ae | 45 | typedef struct route_node *(*route_table_create_node_func_t)( |
46 | route_table_delegate_t *, struct route_table *); | |
f9c1b7bb | 47 | |
d62a17ae | 48 | typedef void (*route_table_destroy_node_func_t)(route_table_delegate_t *, |
49 | struct route_table *, | |
50 | struct route_node *); | |
f9c1b7bb | 51 | |
d62a17ae | 52 | struct route_table_delegate_t_ { |
53 | route_table_create_node_func_t create_node; | |
54 | route_table_destroy_node_func_t destroy_node; | |
f9c1b7bb AS |
55 | }; |
56 | ||
718e3744 | 57 | /* Routing table top structure. */ |
d62a17ae | 58 | struct route_table { |
59 | struct route_node *top; | |
60 | struct hash *hash; | |
61 | ||
62 | /* | |
63 | * Delegate that performs certain functions for this table. | |
64 | */ | |
65 | route_table_delegate_t *delegate; | |
66 | void (*cleanup)(struct route_table *, struct route_node *); | |
67 | ||
68 | unsigned long count; | |
69 | ||
70 | /* | |
71 | * User data. | |
72 | */ | |
73 | void *info; | |
718e3744 | 74 | }; |
75 | ||
4cb260c3 DL |
76 | /* |
77 | * node->link is really internal to the table code and should not be | |
78 | * accessed by outside code. We don't have any writers (yay), though some | |
79 | * readers are left to be fixed. | |
80 | * | |
81 | * rationale: we need to add a hash table in parallel, to speed up | |
82 | * exact-match lookups. | |
83 | * | |
84 | * same really applies for node->parent, though that's less of an issue. | |
85 | * table->link should be - and is - NEVER written by outside code | |
86 | */ | |
87 | #ifdef FRR_COMPILING_TABLE_C | |
88 | #define table_rdonly(x) x | |
89 | #define table_internal(x) x | |
90 | #else | |
91 | #define table_rdonly(x) const x | |
d62a17ae | 92 | #define table_internal(x) \ |
93 | const x __attribute__( \ | |
94 | (deprecated("this should only be accessed by lib/table.c"))) | |
4cb260c3 DL |
95 | /* table_internal is for node->link and node->lock, once we have done |
96 | * something about remaining accesses */ | |
97 | #endif | |
98 | ||
99 | /* so... the problem with this is that "const" doesn't mean "readonly". | |
100 | * It in fact may allow the compiler to optimize based on the assumption | |
101 | * that the value doesn't change. Hence, since the only purpose of this | |
102 | * is to aid in development, don't put the "const" in release builds. | |
103 | * | |
104 | * (I haven't seen this actually break, but GCC and LLVM are getting ever | |
105 | * more aggressive in optimizing...) | |
106 | */ | |
107 | #ifndef DEV_BUILD | |
108 | #undef table_rdonly | |
109 | #define table_rdonly(x) x | |
110 | #endif | |
111 | ||
f9c1b7bb AS |
112 | /* |
113 | * Macro that defines all fields in a route node. | |
114 | */ | |
d62a17ae | 115 | #define ROUTE_NODE_FIELDS \ |
116 | /* Actual prefix of this radix. */ \ | |
117 | struct prefix p; \ | |
118 | \ | |
119 | /* Tree link. */ \ | |
120 | struct route_table *table_rdonly(table); \ | |
121 | struct route_node *table_rdonly(parent); \ | |
122 | struct route_node *table_rdonly(link[2]); \ | |
123 | \ | |
124 | /* Lock of this radix */ \ | |
125 | unsigned int table_rdonly(lock); \ | |
126 | \ | |
127 | /* Each node of route. */ \ | |
128 | void *info; \ | |
f9c1b7bb AS |
129 | |
130 | ||
718e3744 | 131 | /* Each routing entry. */ |
d62a17ae | 132 | struct route_node { |
133 | ROUTE_NODE_FIELDS | |
718e3744 | 134 | |
718e3744 | 135 | #define l_left link[0] |
136 | #define l_right link[1] | |
718e3744 | 137 | }; |
138 | ||
28971c8c AS |
139 | typedef struct route_table_iter_t_ route_table_iter_t; |
140 | ||
d62a17ae | 141 | typedef enum { |
142 | RT_ITER_STATE_INIT, | |
143 | RT_ITER_STATE_ITERATING, | |
144 | RT_ITER_STATE_PAUSED, | |
145 | RT_ITER_STATE_DONE | |
28971c8c AS |
146 | } route_table_iter_state_t; |
147 | ||
148 | /* | |
149 | * route_table_iter_t | |
d62a17ae | 150 | * |
28971c8c AS |
151 | * Structure that holds state for iterating over a route table. |
152 | */ | |
d62a17ae | 153 | struct route_table_iter_t_ { |
28971c8c | 154 | |
d62a17ae | 155 | route_table_iter_state_t state; |
28971c8c | 156 | |
d62a17ae | 157 | /* |
158 | * Routing table that we are iterating over. The caller must ensure | |
159 | * that that table outlives the iterator. | |
160 | */ | |
161 | struct route_table *table; | |
28971c8c | 162 | |
d62a17ae | 163 | /* |
164 | * The node that the iterator is currently on. | |
165 | */ | |
166 | struct route_node *current; | |
28971c8c | 167 | |
d62a17ae | 168 | /* |
169 | * The last prefix that the iterator processed before it was paused. | |
170 | */ | |
171 | struct prefix pause_prefix; | |
28971c8c AS |
172 | }; |
173 | ||
718e3744 | 174 | /* Prototypes. */ |
d62a17ae | 175 | extern struct route_table *route_table_init(void); |
f9c1b7bb AS |
176 | |
177 | extern struct route_table * | |
e0700290 | 178 | route_table_init_with_delegate(route_table_delegate_t *delegate); |
d62a17ae | 179 | |
180 | extern route_table_delegate_t *route_table_get_default_delegate(void); | |
181 | ||
e0700290 DS |
182 | extern void route_table_finish(struct route_table *table); |
183 | extern struct route_node *route_top(struct route_table *table); | |
184 | extern struct route_node *route_next(struct route_node *node); | |
185 | extern struct route_node *route_next_until(struct route_node *node, | |
186 | const struct route_node *limit); | |
187 | extern struct route_node *route_node_get(struct route_table *const table, | |
188 | union prefixconstptr pu); | |
189 | extern struct route_node *route_node_lookup(const struct route_table *table, | |
190 | union prefixconstptr pu); | |
191 | extern struct route_node * | |
192 | route_node_lookup_maynull(const struct route_table *table, | |
193 | union prefixconstptr pu); | |
194 | extern struct route_node *route_node_match(const struct route_table *table, | |
195 | union prefixconstptr pu); | |
196 | extern struct route_node *route_node_match_ipv4(const struct route_table *table, | |
197 | const struct in_addr *addr); | |
198 | extern struct route_node *route_node_match_ipv6(const struct route_table *table, | |
199 | const struct in6_addr *addr); | |
200 | ||
201 | extern unsigned long route_table_count(const struct route_table *table); | |
202 | ||
203 | extern struct route_node *route_node_create(route_table_delegate_t *delegate, | |
204 | struct route_table *table); | |
205 | extern void route_node_delete(struct route_node *node); | |
206 | extern void route_node_destroy(route_table_delegate_t *delegate, | |
207 | struct route_table *table, | |
208 | struct route_node *node); | |
d62a17ae | 209 | |
210 | extern struct route_node *route_table_get_next(const struct route_table *table, | |
211 | union prefixconstptr pu); | |
212 | extern int route_table_prefix_iter_cmp(const struct prefix *p1, | |
213 | const struct prefix *p2); | |
28971c8c AS |
214 | |
215 | /* | |
216 | * Iterator functions. | |
217 | */ | |
d62a17ae | 218 | extern void route_table_iter_init(route_table_iter_t *iter, |
219 | struct route_table *table); | |
220 | extern void route_table_iter_pause(route_table_iter_t *iter); | |
221 | extern void route_table_iter_cleanup(route_table_iter_t *iter); | |
28971c8c AS |
222 | |
223 | /* | |
224 | * Inline functions. | |
225 | */ | |
226 | ||
01dccc0b JB |
227 | /* Lock node. */ |
228 | static inline struct route_node *route_lock_node(struct route_node *node) | |
229 | { | |
acf3a851 | 230 | (*(unsigned *)&node->lock)++; |
01dccc0b JB |
231 | return node; |
232 | } | |
233 | ||
234 | /* Unlock node. */ | |
0e70e6c8 | 235 | static inline void route_unlock_node(struct route_node *node) |
01dccc0b JB |
236 | { |
237 | assert(node->lock > 0); | |
acf3a851 | 238 | (*(unsigned *)&node->lock)--; |
01dccc0b | 239 | |
0e70e6c8 | 240 | if (node->lock == 0) |
01dccc0b JB |
241 | route_node_delete(node); |
242 | } | |
243 | ||
28971c8c AS |
244 | /* |
245 | * route_table_iter_next | |
246 | * | |
247 | * Get the next node in the tree. | |
248 | */ | |
d62a17ae | 249 | static inline struct route_node *route_table_iter_next(route_table_iter_t *iter) |
28971c8c | 250 | { |
d62a17ae | 251 | struct route_node *node; |
28971c8c | 252 | |
d62a17ae | 253 | switch (iter->state) { |
28971c8c | 254 | |
d62a17ae | 255 | case RT_ITER_STATE_INIT: |
28971c8c | 256 | |
d62a17ae | 257 | /* |
258 | * We're just starting the iteration. | |
259 | */ | |
260 | node = route_top(iter->table); | |
261 | break; | |
28971c8c | 262 | |
d62a17ae | 263 | case RT_ITER_STATE_ITERATING: |
264 | node = route_next(iter->current); | |
265 | break; | |
28971c8c | 266 | |
d62a17ae | 267 | case RT_ITER_STATE_PAUSED: |
28971c8c | 268 | |
d62a17ae | 269 | /* |
270 | * Start with the node following pause_prefix. | |
271 | */ | |
272 | node = route_table_get_next(iter->table, &iter->pause_prefix); | |
273 | break; | |
28971c8c | 274 | |
d62a17ae | 275 | case RT_ITER_STATE_DONE: |
276 | return NULL; | |
28971c8c | 277 | |
d62a17ae | 278 | default: |
279 | assert(0); | |
280 | } | |
28971c8c | 281 | |
d62a17ae | 282 | iter->current = node; |
283 | if (node) | |
284 | iter->state = RT_ITER_STATE_ITERATING; | |
285 | else | |
286 | iter->state = RT_ITER_STATE_DONE; | |
28971c8c | 287 | |
d62a17ae | 288 | return node; |
28971c8c AS |
289 | } |
290 | ||
291 | /* | |
292 | * route_table_iter_is_done | |
293 | * | |
294 | * Returns TRUE if the iteration is complete. | |
295 | */ | |
d62a17ae | 296 | static inline int route_table_iter_is_done(route_table_iter_t *iter) |
28971c8c | 297 | { |
d62a17ae | 298 | return iter->state == RT_ITER_STATE_DONE; |
28971c8c AS |
299 | } |
300 | ||
301 | /* | |
302 | * route_table_iter_started | |
303 | * | |
304 | * Returns TRUE if this iterator has started iterating over the tree. | |
305 | */ | |
d62a17ae | 306 | static inline int route_table_iter_started(route_table_iter_t *iter) |
28971c8c | 307 | { |
d62a17ae | 308 | return iter->state != RT_ITER_STATE_INIT; |
28971c8c AS |
309 | } |
310 | ||
718e3744 | 311 | #endif /* _ZEBRA_TABLE_H */ |