Line data Source code
1 : /*
2 : * VRF related header.
3 : * Copyright (C) 2014 6WIND S.A.
4 : *
5 : * This file is part of GNU Zebra.
6 : *
7 : * GNU Zebra is free software; you can redistribute it and/or modify
8 : * it under the terms of the GNU General Public License as published
9 : * by the Free Software Foundation; either version 2, or (at your
10 : * option) any 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 : *
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
20 : */
21 :
22 : #ifndef _ZEBRA_VRF_H
23 : #define _ZEBRA_VRF_H
24 :
25 : #include "openbsd-tree.h"
26 : #include "linklist.h"
27 : #include "qobj.h"
28 : #include "vty.h"
29 : #include "ns.h"
30 :
31 : #ifdef __cplusplus
32 : extern "C" {
33 : #endif
34 :
35 : /* The default VRF ID */
36 : #define VRF_UNKNOWN UINT32_MAX
37 :
38 : /* Pending: May need to refine this. */
39 : #ifndef IFLA_VRF_MAX
40 : enum { IFLA_VRF_UNSPEC, IFLA_VRF_TABLE, __IFLA_VRF_MAX };
41 :
42 : #define IFLA_VRF_MAX (__IFLA_VRF_MAX - 1)
43 : #endif
44 :
45 : #define VRF_NAMSIZ 36
46 : #define NS_NAMSIZ 36
47 :
48 : /*
49 : * The command strings
50 : */
51 : #define VRF_CMD_HELP_STR "Specify the VRF\nThe VRF name\n"
52 : #define VRF_ALL_CMD_HELP_STR "Specify the VRF\nAll VRFs\n"
53 : #define VRF_FULL_CMD_HELP_STR "Specify the VRF\nThe VRF name\nAll VRFs\n"
54 :
55 : #define FRR_VRF_XPATH "/frr-vrf:lib/vrf"
56 : #define FRR_VRF_KEY_XPATH "/frr-vrf:lib/vrf[name='%s']"
57 :
58 : /*
59 : * Pass some OS specific data up through
60 : * to the daemons
61 : */
62 : struct vrf_data {
63 : union {
64 : struct {
65 : uint32_t table_id;
66 : char netns_name[NS_NAMSIZ];
67 : } l;
68 : };
69 : };
70 :
71 : struct vrf {
72 : RB_ENTRY(vrf) id_entry, name_entry;
73 :
74 : /* Identifier, same as the vector index */
75 : vrf_id_t vrf_id;
76 :
77 : /* Name */
78 : char name[VRF_NAMSIZ + 1];
79 :
80 : /* Zebra internal VRF status */
81 : uint8_t status;
82 : #define VRF_ACTIVE (1 << 0) /* VRF is up in kernel */
83 : #define VRF_CONFIGURED (1 << 1) /* VRF has some FRR configuration */
84 :
85 : /* Interfaces belonging to this VRF */
86 : struct if_name_head ifaces_by_name;
87 : struct if_index_head ifaces_by_index;
88 :
89 : /* User data */
90 : void *info;
91 :
92 : /* The table_id from the kernel */
93 : struct vrf_data data;
94 :
95 : /* Back pointer to namespace context */
96 : void *ns_ctxt;
97 :
98 : QOBJ_FIELDS;
99 : };
100 : RB_HEAD(vrf_id_head, vrf);
101 2419 : RB_PROTOTYPE(vrf_id_head, vrf, id_entry, vrf_id_compare)
102 : RB_HEAD(vrf_name_head, vrf);
103 139 : RB_PROTOTYPE(vrf_name_head, vrf, name_entry, vrf_name_compare)
104 : DECLARE_QOBJ_TYPE(vrf);
105 :
106 : /* Allow VRF with netns as backend */
107 : enum vrf_backend_type {
108 : VRF_BACKEND_VRF_LITE,
109 : VRF_BACKEND_NETNS,
110 : VRF_BACKEND_UNKNOWN,
111 : VRF_BACKEND_MAX,
112 : };
113 :
114 : extern struct vrf_id_head vrfs_by_id;
115 : extern struct vrf_name_head vrfs_by_name;
116 :
117 : extern struct vrf *vrf_lookup_by_id(vrf_id_t);
118 : extern struct vrf *vrf_lookup_by_name(const char *);
119 : extern struct vrf *vrf_get(vrf_id_t, const char *);
120 : extern struct vrf *vrf_update(vrf_id_t new_vrf_id, const char *name);
121 : extern const char *vrf_id_to_name(vrf_id_t vrf_id);
122 :
123 : #define VRF_LOGNAME(V) V ? V->name : "Unknown"
124 :
125 : #define VRF_GET_ID(V, NAME, USE_JSON) \
126 : do { \
127 : struct vrf *_vrf; \
128 : if (!(_vrf = vrf_lookup_by_name(NAME))) { \
129 : if (USE_JSON) { \
130 : vty_out(vty, "{}\n"); \
131 : } else { \
132 : vty_out(vty, "%% VRF %s not found\n", NAME); \
133 : } \
134 : return CMD_WARNING; \
135 : } \
136 : if (_vrf->vrf_id == VRF_UNKNOWN) { \
137 : if (USE_JSON) { \
138 : vty_out(vty, "{}\n"); \
139 : } else { \
140 : vty_out(vty, "%% VRF %s not active\n", NAME); \
141 : } \
142 : return CMD_WARNING; \
143 : } \
144 : (V) = _vrf->vrf_id; \
145 : } while (0)
146 :
147 : /*
148 : * Check whether the VRF is enabled.
149 : */
150 41 : static inline int vrf_is_enabled(struct vrf *vrf)
151 : {
152 41 : return vrf && CHECK_FLAG(vrf->status, VRF_ACTIVE);
153 : }
154 :
155 : /* check if the vrf is user configured */
156 8 : static inline int vrf_is_user_cfged(struct vrf *vrf)
157 : {
158 8 : return vrf && CHECK_FLAG(vrf->status, VRF_CONFIGURED);
159 : }
160 :
161 : static inline uint32_t vrf_interface_count(struct vrf *vrf)
162 : {
163 : uint32_t count = 0;
164 : struct interface *ifp;
165 :
166 : RB_FOREACH (ifp, if_name_head, &vrf->ifaces_by_name) {
167 : /* skip the l3mdev */
168 : if (strncmp(ifp->name, vrf->name, VRF_NAMSIZ) == 0)
169 : continue;
170 : count++;
171 : }
172 : return count;
173 : }
174 :
175 : /*
176 : * Utilities to obtain the user data
177 : */
178 :
179 : /* Look up the data pointer of the specified VRF. */
180 : extern void *vrf_info_lookup(vrf_id_t);
181 :
182 : /*
183 : * VRF bit-map: maintaining flags, one bit per VRF ID
184 : */
185 :
186 : typedef void *vrf_bitmap_t;
187 : #define VRF_BITMAP_NULL NULL
188 :
189 : extern vrf_bitmap_t vrf_bitmap_init(void);
190 : extern void vrf_bitmap_free(vrf_bitmap_t);
191 : extern void vrf_bitmap_set(vrf_bitmap_t, vrf_id_t);
192 : extern void vrf_bitmap_unset(vrf_bitmap_t, vrf_id_t);
193 : extern int vrf_bitmap_check(vrf_bitmap_t, vrf_id_t);
194 :
195 : /*
196 : * VRF initializer/destructor
197 : *
198 : * create -> Called back when a new VRF is created. This
199 : * can be either through these 3 options:
200 : * 1) CLI mentions a vrf before OS knows about it
201 : * 2) OS calls zebra and we create the vrf from OS
202 : * callback
203 : * 3) zebra calls individual protocols to notify
204 : * about the new vrf
205 : *
206 : * enable -> Called back when a VRF is actually usable from
207 : * an OS perspective ( 2 and 3 above )
208 : *
209 : * disable -> Called back when a VRF is being deleted from
210 : * the system ( 2 and 3 ) above
211 : *
212 : * delete -> Called back when a vrf is being deleted from
213 : * the system ( 2 and 3 ) above.
214 : */
215 : extern void vrf_init(int (*create)(struct vrf *vrf),
216 : int (*enable)(struct vrf *vrf),
217 : int (*disable)(struct vrf *vrf),
218 : int (*destroy)(struct vrf *vrf));
219 :
220 : /*
221 : * Call vrf_terminate when the protocol is being shutdown
222 : */
223 : extern void vrf_terminate(void);
224 :
225 : /*
226 : * Utilities to create networks objects,
227 : * or call network operations
228 : */
229 :
230 : /*
231 : * Create a new socket associated with a VRF.
232 : *
233 : * This is a wrapper that ensures correct behavior when using namespace VRFs.
234 : * In the namespace case, the socket is created within the namespace. In the
235 : * non-namespace case, this is equivalent to socket().
236 : *
237 : * If name is provided, this is provided to vrf_bind() to bind the socket to
238 : * the VRF. This is only relevant when using VRF-lite.
239 : *
240 : * Summary:
241 : * - Namespace: pass vrf_id but not name
242 : * - VRF-lite: pass vrf_id and name of VRF device to bind to
243 : * - VRF-lite, no binding: pass vrf_id but not name, or just use socket()
244 : */
245 : extern int vrf_socket(int domain, int type, int protocol, vrf_id_t vrf_id,
246 : const char *name);
247 :
248 : extern int vrf_sockunion_socket(const union sockunion *su, vrf_id_t vrf_id,
249 : const char *name);
250 :
251 : /*
252 : * Binds a socket to an interface (ifname) in a VRF (vrf_id).
253 : *
254 : * If ifname is NULL or is equal to the VRF name then bind to a VRF device.
255 : * Otherwise, bind to the specified interface in the specified VRF.
256 : *
257 : * Returns 0 on success and -1 on failure.
258 : */
259 : extern int vrf_bind(vrf_id_t vrf_id, int fd, const char *ifname);
260 :
261 : /* VRF ioctl operations */
262 : extern int vrf_getaddrinfo(const char *node, const char *service,
263 : const struct addrinfo *hints, struct addrinfo **res,
264 : vrf_id_t vrf_id);
265 :
266 : extern int vrf_ioctl(vrf_id_t vrf_id, int d, unsigned long request, char *args);
267 :
268 : /* The default VRF ID */
269 : #define VRF_DEFAULT 0
270 :
271 : /* Must be called only during startup, before config is read */
272 : extern void vrf_set_default_name(const char *default_name);
273 :
274 : extern const char *vrf_get_default_name(void);
275 : #define VRF_DEFAULT_NAME vrf_get_default_name()
276 :
277 : /* VRF switch from NETNS */
278 : extern int vrf_switch_to_netns(vrf_id_t vrf_id);
279 : extern int vrf_switchback_to_initial(void);
280 :
281 : /*
282 : * VRF backend routines
283 : * should be called from zebra only
284 : */
285 :
286 : /* VRF vty command initialisation
287 : */
288 : extern void vrf_cmd_init(int (*writefunc)(struct vty *vty));
289 :
290 : /* VRF vty debugging
291 : */
292 : extern void vrf_install_commands(void);
293 :
294 : /*
295 : * VRF utilities
296 : */
297 :
298 : /*
299 : * API for configuring VRF backend
300 : */
301 : extern int vrf_configure_backend(enum vrf_backend_type backend);
302 : extern int vrf_get_backend(void);
303 : extern int vrf_is_backend_netns(void);
304 :
305 : /* used internally to enable or disable VRF.
306 : * Notify a change in the VRF ID of the VRF
307 : */
308 : extern void vrf_disable(struct vrf *vrf);
309 : extern int vrf_enable(struct vrf *vrf);
310 : extern void vrf_delete(struct vrf *vrf);
311 :
312 : extern const struct frr_yang_module_info frr_vrf_info;
313 :
314 : #ifdef __cplusplus
315 : }
316 : #endif
317 :
318 : #endif /*_ZEBRA_VRF_H*/
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