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ed0e57e3 DA |
1 | /* BGP community, large-community aliasing. |
2 | * | |
3 | * Copyright (C) 2021 Donatas Abraitis <donatas.abraitis@gmail.com> | |
4 | * | |
5 | * This file is part of FRRouting (FRR). | |
6 | * | |
7 | * FRR is free software; you can redistribute it and/or modify it under the | |
8 | * terms of the GNU General Public License as published by the Free Software | |
9 | * Foundation; either version 2, or (at your option) any later version. | |
10 | * | |
11 | * FRR is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
13 | * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more | |
14 | * details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "memory.h" | |
22 | #include "lib/jhash.h" | |
f4dd8296 | 23 | #include "frrstr.h" |
ed0e57e3 DA |
24 | |
25 | #include "bgpd/bgpd.h" | |
26 | #include "bgpd/bgp_community_alias.h" | |
27 | ||
28 | static struct hash *bgp_ca_alias_hash; | |
29 | static struct hash *bgp_ca_community_hash; | |
30 | ||
31 | static unsigned int bgp_ca_community_hash_key(const void *p) | |
32 | { | |
33 | const struct community_alias *ca = p; | |
34 | ||
35 | return jhash(ca->community, sizeof(ca->community), 0); | |
36 | } | |
37 | ||
38 | static bool bgp_ca_community_hash_cmp(const void *p1, const void *p2) | |
39 | { | |
40 | const struct community_alias *ca1 = p1; | |
41 | const struct community_alias *ca2 = p2; | |
42 | ||
43 | return (strncmp(ca1->community, ca2->community, | |
44 | sizeof(struct community_alias)) | |
45 | == 0); | |
46 | } | |
47 | ||
48 | static unsigned int bgp_ca_alias_hash_key(const void *p) | |
49 | { | |
50 | const struct community_alias *ca = p; | |
51 | ||
52 | return jhash(ca->alias, sizeof(ca->alias), 0); | |
53 | } | |
54 | ||
55 | static bool bgp_ca_alias_hash_cmp(const void *p1, const void *p2) | |
56 | { | |
57 | const struct community_alias *ca1 = p1; | |
58 | const struct community_alias *ca2 = p2; | |
59 | ||
60 | return (strncmp(ca1->alias, ca2->alias, sizeof(struct community_alias)) | |
61 | == 0); | |
62 | } | |
63 | ||
64 | static void *bgp_community_alias_alloc(void *p) | |
65 | { | |
66 | const struct community_alias *ca = p; | |
67 | struct communtiy_alias *new; | |
68 | ||
69 | new = XCALLOC(MTYPE_COMMUNITY_ALIAS, sizeof(struct community_alias)); | |
70 | memcpy(new, ca, sizeof(struct community_alias)); | |
71 | ||
72 | return new; | |
73 | } | |
74 | ||
75 | void bgp_community_alias_init(void) | |
76 | { | |
77 | bgp_ca_community_hash = hash_create(bgp_ca_community_hash_key, | |
78 | bgp_ca_community_hash_cmp, | |
79 | "BGP community alias (community)"); | |
80 | bgp_ca_alias_hash = | |
81 | hash_create(bgp_ca_alias_hash_key, bgp_ca_alias_hash_cmp, | |
82 | "BGP community alias (alias)"); | |
83 | } | |
84 | ||
85 | void bgp_community_alias_finish(void) | |
86 | { | |
87 | hash_free(bgp_ca_community_hash); | |
88 | hash_free(bgp_ca_alias_hash); | |
89 | } | |
90 | ||
91 | static void bgp_community_alias_show_iterator(struct hash_bucket *hb, | |
92 | struct vty *vty) | |
93 | { | |
94 | struct community_alias *ca = hb->data; | |
95 | ||
96 | vty_out(vty, "bgp community alias %s %s\n", ca->community, ca->alias); | |
97 | } | |
98 | ||
99 | int bgp_community_alias_write(struct vty *vty) | |
100 | { | |
101 | hash_iterate(bgp_ca_community_hash, | |
102 | (void (*)(struct hash_bucket *, | |
103 | void *))bgp_community_alias_show_iterator, | |
104 | vty); | |
105 | return 1; | |
106 | } | |
107 | ||
108 | void bgp_ca_community_insert(struct community_alias *ca) | |
109 | { | |
110 | hash_get(bgp_ca_community_hash, ca, bgp_community_alias_alloc); | |
111 | } | |
112 | ||
113 | void bgp_ca_alias_insert(struct community_alias *ca) | |
114 | { | |
115 | hash_get(bgp_ca_alias_hash, ca, bgp_community_alias_alloc); | |
116 | } | |
117 | ||
118 | void bgp_ca_community_delete(struct community_alias *ca) | |
119 | { | |
120 | struct community_alias *data = hash_release(bgp_ca_community_hash, ca); | |
121 | ||
122 | XFREE(MTYPE_COMMUNITY_ALIAS, data); | |
123 | } | |
124 | ||
125 | void bgp_ca_alias_delete(struct community_alias *ca) | |
126 | { | |
127 | struct community_alias *data = hash_release(bgp_ca_alias_hash, ca); | |
128 | ||
129 | XFREE(MTYPE_COMMUNITY_ALIAS, data); | |
130 | } | |
131 | ||
132 | struct community_alias *bgp_ca_community_lookup(struct community_alias *ca) | |
133 | { | |
134 | return hash_lookup(bgp_ca_community_hash, ca); | |
135 | } | |
136 | ||
137 | struct community_alias *bgp_ca_alias_lookup(struct community_alias *ca) | |
138 | { | |
139 | return hash_lookup(bgp_ca_alias_hash, ca); | |
140 | } | |
141 | ||
142 | const char *bgp_community2alias(char *community) | |
143 | { | |
144 | struct community_alias ca; | |
145 | struct community_alias *find; | |
146 | ||
147 | memset(&ca, 0, sizeof(ca)); | |
148 | strlcpy(ca.community, community, sizeof(ca.community)); | |
149 | ||
150 | find = bgp_ca_community_lookup(&ca); | |
151 | if (find) | |
152 | return find->alias; | |
153 | ||
154 | return community; | |
155 | } | |
b4ad2fae | 156 | |
f4dd8296 DA |
157 | const char *bgp_alias2community(char *alias) |
158 | { | |
159 | struct community_alias ca; | |
160 | struct community_alias *find; | |
161 | ||
162 | memset(&ca, 0, sizeof(ca)); | |
163 | strlcpy(ca.alias, alias, sizeof(ca.alias)); | |
164 | ||
165 | find = bgp_ca_alias_lookup(&ca); | |
166 | if (find) | |
167 | return find->community; | |
168 | ||
169 | return alias; | |
170 | } | |
171 | ||
172 | /* Communities structs have `->str` which is used | |
173 | * for vty outputs and extended BGP community lists | |
174 | * with regexp. | |
175 | * This is a helper to convert already aliased version | |
176 | * of communities into numerical-only format. | |
177 | */ | |
178 | const char *bgp_alias2community_str(const char *str) | |
179 | { | |
180 | char **aliases; | |
181 | int num; | |
182 | ||
183 | frrstr_split(str, " ", &aliases, &num); | |
184 | const char *communities[num + 1]; | |
185 | ||
186 | for (int i = 0; i < num; i++) { | |
187 | communities[i] = | |
188 | XSTRDUP(MTYPE_TMP, bgp_alias2community(aliases[i])); | |
189 | XFREE(MTYPE_TMP, aliases[i]); | |
190 | } | |
191 | XFREE(MTYPE_TMP, aliases); | |
192 | ||
193 | return frrstr_join(communities, num, " "); | |
194 | } | |
195 | ||
b4ad2fae DS |
196 | static int bgp_community_alias_vector_walker(struct hash_bucket *bucket, |
197 | void *data) | |
198 | { | |
199 | vector *comps = data; | |
200 | struct community_alias *alias = bucket->data; | |
201 | ||
202 | vector_set(*comps, XSTRDUP(MTYPE_COMPLETION, alias->alias)); | |
203 | ||
204 | return 1; | |
205 | } | |
206 | ||
207 | static void bgp_community_alias_cmd_completion(vector comps, | |
208 | struct cmd_token *token) | |
209 | { | |
210 | hash_walk(bgp_ca_alias_hash, bgp_community_alias_vector_walker, &comps); | |
211 | } | |
212 | ||
213 | static const struct cmd_variable_handler community_alias_handlers[] = { | |
214 | {.varname = "alias_name", | |
215 | .completions = bgp_community_alias_cmd_completion}, | |
216 | {.tokenname = "ALIAS_NAME", | |
217 | .completions = bgp_community_alias_cmd_completion}, | |
218 | {.completions = NULL}}; | |
219 | ||
220 | void bgp_community_alias_command_completion_setup(void) | |
221 | { | |
222 | cmd_variable_handler_register(community_alias_handlers); | |
223 | } |