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Commit | Line | Data |
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8bdb05ed | 1 | /* |
4f082dfa | 2 | * BIRD Internet Routing Daemon -- Dynamic data structures |
8bdb05ed MM |
3 | * |
4 | * (c) 1999 Pavel Machek <pavel@ucw.cz> | |
5 | * (c) 2018--2019 Maria Matejka <mq@jmq.cz> | |
6 | * | |
7 | * Can be freely distributed and used under the terms of the GNU GPL. | |
8 | */ | |
9 | ||
4f082dfa MM |
10 | #ifndef _BIRD_FILTER_DATA_H_ |
11 | #define _BIRD_FILTER_DATA_H_ | |
8bdb05ed | 12 | |
4f082dfa | 13 | #include "nest/bird.h" |
8bdb05ed MM |
14 | |
15 | /* Type numbers must be in 0..0xff range */ | |
16 | #define T_MASK 0xff | |
17 | ||
18 | /* Internal types */ | |
19 | enum f_type { | |
96d757c1 JMM |
20 | /* Nothing. Simply nothing. */ |
21 | T_VOID = 0, | |
8bdb05ed MM |
22 | |
23 | /* User visible types, which fit in int */ | |
24 | T_INT = 0x10, | |
25 | T_BOOL = 0x11, | |
26 | T_PAIR = 0x12, /* Notice that pair is stored as integer: first << 16 | second */ | |
27 | T_QUAD = 0x13, | |
28 | ||
29 | /* Put enumerational types in 0x30..0x3f range */ | |
30 | T_ENUM_LO = 0x30, | |
31 | T_ENUM_HI = 0x3f, | |
32 | ||
33 | T_ENUM_RTS = 0x30, | |
34 | T_ENUM_BGP_ORIGIN = 0x31, | |
35 | T_ENUM_SCOPE = 0x32, | |
36 | T_ENUM_RTC = 0x33, | |
37 | T_ENUM_RTD = 0x34, | |
38 | T_ENUM_ROA = 0x35, | |
39 | T_ENUM_NETTYPE = 0x36, | |
40 | T_ENUM_RA_PREFERENCE = 0x37, | |
0edf0c8c | 41 | T_ENUM_AF = 0x38, |
8bdb05ed MM |
42 | |
43 | /* new enums go here */ | |
44 | T_ENUM_EMPTY = 0x3f, /* Special hack for atomic_aggr */ | |
45 | ||
46 | #define T_ENUM T_ENUM_LO ... T_ENUM_HI | |
47 | ||
48 | /* Bigger ones */ | |
49 | T_IP = 0x20, | |
50 | T_NET = 0x21, | |
51 | T_STRING = 0x22, | |
52 | T_PATH_MASK = 0x23, /* mask for BGP path */ | |
53 | T_PATH = 0x24, /* BGP path */ | |
54 | T_CLIST = 0x25, /* Community list */ | |
55 | T_EC = 0x26, /* Extended community value, u64 */ | |
56 | T_ECLIST = 0x27, /* Extended community list */ | |
57 | T_LC = 0x28, /* Large community value, lcomm */ | |
58 | T_LCLIST = 0x29, /* Large community list */ | |
59 | T_RD = 0x2a, /* Route distinguisher for VPN addresses */ | |
60 | T_PATH_MASK_ITEM = 0x2b, /* Path mask item for path mask constructors */ | |
61 | ||
62 | T_SET = 0x80, | |
63 | T_PREFIX_SET = 0x81, | |
64 | } PACKED; | |
65 | ||
66 | /* Filter value; size of this affects filter memory consumption */ | |
67 | struct f_val { | |
68 | enum f_type type; /* T_* */ | |
69 | union { | |
70 | uint i; | |
71 | u64 ec; | |
72 | lcomm lc; | |
73 | ip_addr ip; | |
74 | const net_addr *net; | |
fd9f0c06 | 75 | const char *s; |
8bdb05ed MM |
76 | const struct f_tree *t; |
77 | const struct f_trie *ti; | |
78 | const struct adata *ad; | |
79 | const struct f_path_mask *path_mask; | |
80 | struct f_path_mask_item pmi; | |
81 | } val; | |
82 | }; | |
83 | ||
8bdb05ed MM |
84 | /* Dynamic attribute definition (eattrs) */ |
85 | struct f_dynamic_attr { | |
86 | u8 type; /* EA type (EAF_*) */ | |
87 | u8 bit; /* For bitfield accessors */ | |
88 | enum f_type f_type; /* Filter type */ | |
89 | uint ea_code; /* EA code */ | |
90 | }; | |
91 | ||
92 | enum f_sa_code { | |
93 | SA_FROM = 1, | |
94 | SA_GW, | |
95 | SA_NET, | |
96 | SA_PROTO, | |
97 | SA_SOURCE, | |
98 | SA_SCOPE, | |
99 | SA_DEST, | |
100 | SA_IFNAME, | |
101 | SA_IFINDEX, | |
8cc5bb09 | 102 | SA_WEIGHT, |
e5468d16 | 103 | SA_GW_MPLS, |
8bdb05ed MM |
104 | } PACKED; |
105 | ||
106 | /* Static attribute definition (members of struct rta) */ | |
107 | struct f_static_attr { | |
108 | enum f_type f_type; /* Filter type */ | |
109 | enum f_sa_code sa_code; /* Static attribute id */ | |
110 | int readonly:1; /* Don't allow writing */ | |
111 | }; | |
112 | ||
4f082dfa MM |
113 | /* Filter l-value type */ |
114 | enum f_lval_type { | |
115 | F_LVAL_VARIABLE, | |
116 | F_LVAL_PREFERENCE, | |
117 | F_LVAL_SA, | |
118 | F_LVAL_EA, | |
119 | }; | |
120 | ||
121 | /* Filter l-value */ | |
122 | struct f_lval { | |
123 | enum f_lval_type type; | |
124 | union { | |
b40c0f02 | 125 | struct symbol *sym; |
4f082dfa MM |
126 | struct f_dynamic_attr da; |
127 | struct f_static_attr sa; | |
128 | }; | |
129 | }; | |
130 | ||
131 | /* IP prefix range structure */ | |
132 | struct f_prefix { | |
133 | net_addr net; /* The matching prefix must match this net */ | |
134 | u8 lo, hi; /* And its length must fit between lo and hi */ | |
135 | }; | |
136 | ||
8bdb05ed MM |
137 | struct f_tree { |
138 | struct f_tree *left, *right; | |
139 | struct f_val from, to; | |
140 | void *data; | |
141 | }; | |
142 | ||
062e69bf OZ |
143 | #define TRIE_STEP 4 |
144 | #define TRIE_STACK_LENGTH 33 | |
13225f1d | 145 | |
27550028 OZ |
146 | struct f_trie_node4 |
147 | { | |
148 | ip4_addr addr, mask, accept; | |
13225f1d OZ |
149 | u16 plen; |
150 | u16 local; | |
151 | struct f_trie_node4 *c[1 << TRIE_STEP]; | |
27550028 OZ |
152 | }; |
153 | ||
154 | struct f_trie_node6 | |
8bdb05ed | 155 | { |
27550028 | 156 | ip6_addr addr, mask, accept; |
13225f1d OZ |
157 | u16 plen; |
158 | u16 local; | |
159 | struct f_trie_node6 *c[1 << TRIE_STEP]; | |
27550028 OZ |
160 | }; |
161 | ||
162 | struct f_trie_node | |
163 | { | |
164 | union { | |
165 | struct f_trie_node4 v4; | |
166 | struct f_trie_node6 v6; | |
167 | }; | |
8bdb05ed MM |
168 | }; |
169 | ||
170 | struct f_trie | |
171 | { | |
172 | linpool *lp; | |
27550028 OZ |
173 | u8 zero; |
174 | s8 ipv4; /* -1 for undefined / empty */ | |
175 | u16 data_size; /* Additional data for each trie node */ | |
ba5aec94 | 176 | u32 prefix_count; /* Works only for restricted tries (pxlen == l == h) */ |
27550028 | 177 | struct f_trie_node root; /* Root trie node */ |
8bdb05ed MM |
178 | }; |
179 | ||
062e69bf OZ |
180 | struct f_trie_walk_state |
181 | { | |
182 | u8 ipv4; | |
183 | u8 accept_length; /* Current inter-node prefix position */ | |
184 | u8 start_pos; /* Initial prefix position in stack[0] */ | |
185 | u8 local_pos; /* Current intra-node prefix position */ | |
186 | u8 stack_pos; /* Current node in stack below */ | |
187 | const struct f_trie_node *stack[TRIE_STACK_LENGTH]; | |
188 | }; | |
189 | ||
8bdb05ed MM |
190 | struct f_tree *f_new_tree(void); |
191 | struct f_tree *build_tree(struct f_tree *); | |
192 | const struct f_tree *find_tree(const struct f_tree *t, const struct f_val *val); | |
193 | int same_tree(const struct f_tree *t0, const struct f_tree *t2); | |
194 | void tree_format(const struct f_tree *t, buffer *buf); | |
d06a875b | 195 | void tree_walk(const struct f_tree *t, void (*hook)(const struct f_tree *, void *), void *data); |
8bdb05ed | 196 | |
27550028 | 197 | struct f_trie *f_new_trie(linpool *lp, uint data_size); |
8bdb05ed MM |
198 | void *trie_add_prefix(struct f_trie *t, const net_addr *n, uint l, uint h); |
199 | int trie_match_net(const struct f_trie *t, const net_addr *n); | |
14fc24f3 OZ |
200 | int trie_match_longest_ip4(const struct f_trie *t, const net_addr_ip4 *net, net_addr_ip4 *dst, ip4_addr *found0); |
201 | int trie_match_longest_ip6(const struct f_trie *t, const net_addr_ip6 *net, net_addr_ip6 *dst, ip6_addr *found0); | |
062e69bf OZ |
202 | void trie_walk_init(struct f_trie_walk_state *s, const struct f_trie *t, const net_addr *from); |
203 | int trie_walk_next(struct f_trie_walk_state *s, net_addr *net); | |
8bdb05ed MM |
204 | int trie_same(const struct f_trie *t1, const struct f_trie *t2); |
205 | void trie_format(const struct f_trie *t, buffer *buf); | |
206 | ||
14fc24f3 OZ |
207 | static inline int |
208 | trie_match_next_longest_ip4(net_addr_ip4 *n, ip4_addr *found) | |
209 | { | |
210 | while (n->pxlen) | |
211 | { | |
212 | n->pxlen--; | |
213 | ip4_clrbit(&n->prefix, n->pxlen); | |
214 | ||
215 | if (ip4_getbit(*found, n->pxlen)) | |
216 | return 1; | |
217 | } | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static inline int | |
223 | trie_match_next_longest_ip6(net_addr_ip6 *n, ip6_addr *found) | |
224 | { | |
225 | while (n->pxlen) | |
226 | { | |
227 | n->pxlen--; | |
228 | ip6_clrbit(&n->prefix, n->pxlen); | |
229 | ||
230 | if (ip6_getbit(*found, n->pxlen)) | |
231 | return 1; | |
232 | } | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | ||
238 | #define TRIE_WALK_TO_ROOT_IP4(trie, net, dst) ({ \ | |
239 | net_addr_ip4 dst; \ | |
240 | ip4_addr _found; \ | |
241 | for (int _n = trie_match_longest_ip4(trie, net, &dst, &_found); \ | |
242 | _n; \ | |
243 | _n = trie_match_next_longest_ip4(&dst, &_found)) | |
244 | ||
245 | #define TRIE_WALK_TO_ROOT_IP6(trie, net, dst) ({ \ | |
246 | net_addr_ip6 dst; \ | |
247 | ip6_addr _found; \ | |
248 | for (int _n = trie_match_longest_ip6(trie, net, &dst, &_found); \ | |
249 | _n; \ | |
250 | _n = trie_match_next_longest_ip6(&dst, &_found)) | |
251 | ||
252 | #define TRIE_WALK_TO_ROOT_END }) | |
253 | ||
254 | ||
062e69bf OZ |
255 | #define TRIE_WALK(trie, net, from) ({ \ |
256 | net_addr net; \ | |
257 | struct f_trie_walk_state tws_; \ | |
258 | trie_walk_init(&tws_, trie, from); \ | |
259 | while (trie_walk_next(&tws_, &net)) | |
260 | ||
261 | #define TRIE_WALK_END }) | |
262 | ||
14fc24f3 | 263 | |
52893045 MM |
264 | #define F_CMP_ERROR 999 |
265 | ||
87512e97 OZ |
266 | const char *f_type_name(enum f_type t); |
267 | ||
0e1fd7ea AZ |
268 | enum f_type f_type_element_type(enum f_type t); |
269 | ||
52893045 MM |
270 | int val_same(const struct f_val *v1, const struct f_val *v2); |
271 | int val_compare(const struct f_val *v1, const struct f_val *v2); | |
272 | void val_format(const struct f_val *v, buffer *buf); | |
b40c0f02 | 273 | char *val_format_str(struct linpool *lp, const struct f_val *v); |
52893045 MM |
274 | const char *val_dump(const struct f_val *v); |
275 | ||
276 | static inline int val_is_ip4(const struct f_val *v) | |
277 | { return (v->type == T_IP) && ipa_is_ip4(v->val.ip); } | |
278 | int val_in_range(const struct f_val *v1, const struct f_val *v2); | |
279 | ||
280 | int clist_set_type(const struct f_tree *set, struct f_val *v); | |
281 | static inline int eclist_set_type(const struct f_tree *set) | |
282 | { return set->from.type == T_EC; } | |
283 | static inline int lclist_set_type(const struct f_tree *set) | |
284 | { return set->from.type == T_LC; } | |
285 | ||
286 | const struct adata *clist_filter(struct linpool *pool, const struct adata *list, const struct f_val *set, int pos); | |
287 | const struct adata *eclist_filter(struct linpool *pool, const struct adata *list, const struct f_val *set, int pos); | |
288 | const struct adata *lclist_filter(struct linpool *pool, const struct adata *list, const struct f_val *set, int pos); | |
289 | ||
290 | ||
291 | /* Special undef value for paths and clists */ | |
292 | static inline int | |
293 | undef_value(struct f_val v) | |
294 | { | |
295 | return ((v.type == T_PATH) || (v.type == T_CLIST) || | |
296 | (v.type == T_ECLIST) || (v.type == T_LCLIST)) && | |
297 | (v.val.ad == &null_adata); | |
298 | } | |
299 | ||
8bdb05ed MM |
300 | extern const struct f_val f_const_empty_path, f_const_empty_clist, f_const_empty_eclist, f_const_empty_lclist; |
301 | ||
52893045 MM |
302 | enum filter_return f_eval(const struct f_line *expr, struct linpool *tmp_pool, struct f_val *pres); |
303 | ||
8bdb05ed | 304 | #endif |