lib/vrf.h

   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       16
  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 /*
  56  * Pass some OS specific data up through
  57  * to the daemons
  58  */
  59 struct vrf_data {
  60         union {
  61                 struct {
  62                         uint32_t table_id;
  63                         char netns_name[NS_NAMSIZ];
  64                 } l;
  65         };
  66 };
  67
  68 struct vrf {
  69         RB_ENTRY(vrf) id_entry, name_entry;
  70
  71         /* Identifier, same as the vector index */
  72         vrf_id_t vrf_id;
  73
  74         /* Name */
  75         char name[VRF_NAMSIZ + 1];
  76
  77         /* Zebra internal VRF status */
  78         uint8_t status;
  79 #define VRF_ACTIVE     (1 << 0) /* VRF is up in kernel */
  80 #define VRF_CONFIGURED (1 << 1) /* VRF has some FRR configuration */
  81
  82         /* Interfaces belonging to this VRF */
  83         struct if_name_head ifaces_by_name;
  84         struct if_index_head ifaces_by_index;
  85
  86         /* User data */
  87         void *info;
  88
  89         /* The table_id from the kernel */
  90         struct vrf_data data;
  91
  92         /* Back pointer to namespace context */
  93         void *ns_ctxt;
  94
  95         QOBJ_FIELDS
  96 };
  97 RB_HEAD(vrf_id_head, vrf);
  98 RB_PROTOTYPE(vrf_id_head, vrf, id_entry, vrf_id_compare)
  99 RB_HEAD(vrf_name_head, vrf);
 100 RB_PROTOTYPE(vrf_name_head, vrf, name_entry, vrf_name_compare)
 101 DECLARE_QOBJ_TYPE(vrf)
 102
 103 /* Allow VRF with netns as backend */
 104 #define VRF_BACKEND_VRF_LITE 0
 105 #define VRF_BACKEND_NETNS    1
 106
 107 extern struct vrf_id_head vrfs_by_id;
 108 extern struct vrf_name_head vrfs_by_name;
 109
 110 extern struct vrf *vrf_lookup_by_id(vrf_id_t);
 111 extern struct vrf *vrf_lookup_by_name(const char *);
 112 extern struct vrf *vrf_get(vrf_id_t, const char *);
 113 extern const char *vrf_id_to_name(vrf_id_t vrf_id);
 114 extern vrf_id_t vrf_name_to_id(const char *);
 115
 116 #define VRF_GET_ID(V, NAME, USE_JSON)                                          \
 117         do {                                                                   \
 118                 struct vrf *_vrf;                                              \
 119                 if (!(_vrf = vrf_lookup_by_name(NAME))) {                      \
 120                         if (USE_JSON) {                                        \
 121                                 vty_out(vty, "{}\n");                          \
 122                         } else {                                               \
 123                                 vty_out(vty, "%% VRF %s not found\n", NAME);   \
 124                         }                                                      \
 125                         return CMD_WARNING;                                    \
 126                 }                                                              \
 127                 if (_vrf->vrf_id == VRF_UNKNOWN) {                             \
 128                         if (USE_JSON) {                                        \
 129                                 vty_out(vty, "{}\n");                          \
 130                         } else {                                               \
 131                                 vty_out(vty, "%% VRF %s not active\n", NAME);  \
 132                         }                                                      \
 133                         return CMD_WARNING;                                    \
 134                 }                                                              \
 135                 (V) = _vrf->vrf_id;                                            \
 136         } while (0)
 137
 138 /*
 139  * Check whether the VRF is enabled.
 140  */
 141 static inline int vrf_is_enabled(struct vrf *vrf)
 142 {
 143         return vrf && CHECK_FLAG(vrf->status, VRF_ACTIVE);
 144 }
 145
 146 /* check if the vrf is user configured */
 147 static inline int vrf_is_user_cfged(struct vrf *vrf)
 148 {
 149         return vrf && CHECK_FLAG(vrf->status, VRF_CONFIGURED);
 150 }
 151
 152 /* Mark that VRF has user configuration */
 153 static inline void vrf_set_user_cfged(struct vrf *vrf)
 154 {
 155         SET_FLAG(vrf->status, VRF_CONFIGURED);
 156 }
 157
 158 /* Mark that VRF no longer has any user configuration */
 159 static inline void vrf_reset_user_cfged(struct vrf *vrf)
 160 {
 161         UNSET_FLAG(vrf->status, VRF_CONFIGURED);
 162 }
 163
 164 /*
 165  * Utilities to obtain the user data
 166  */
 167
 168 /* Get the data pointer of the specified VRF. If not found, create one. */
 169 extern void *vrf_info_get(vrf_id_t);
 170 /* Look up the data pointer of the specified VRF. */
 171 extern void *vrf_info_lookup(vrf_id_t);
 172
 173 /*
 174  * VRF bit-map: maintaining flags, one bit per VRF ID
 175  */
 176
 177 typedef void *vrf_bitmap_t;
 178 #define VRF_BITMAP_NULL     NULL
 179
 180 extern vrf_bitmap_t vrf_bitmap_init(void);
 181 extern void vrf_bitmap_free(vrf_bitmap_t);
 182 extern void vrf_bitmap_set(vrf_bitmap_t, vrf_id_t);
 183 extern void vrf_bitmap_unset(vrf_bitmap_t, vrf_id_t);
 184 extern int vrf_bitmap_check(vrf_bitmap_t, vrf_id_t);
 185
 186 /*
 187  * VRF initializer/destructor
 188  *
 189  * create -> Called back when a new VRF is created.  This
 190  *           can be either through these 3 options:
 191  *           1) CLI mentions a vrf before OS knows about it
 192  *           2) OS calls zebra and we create the vrf from OS
 193  *              callback
 194  *           3) zebra calls individual protocols to notify
 195  *              about the new vrf
 196  *
 197  * enable -> Called back when a VRF is actually usable from
 198  *           an OS perspective ( 2 and 3 above )
 199  *
 200  * disable -> Called back when a VRF is being deleted from
 201  *            the system ( 2 and 3 ) above
 202  *
 203  * delete -> Called back when a vrf is being deleted from
 204  *           the system ( 2 and 3 ) above.
 205  */
 206 extern void vrf_init(int (*create)(struct vrf *vrf), int (*enable)(struct vrf *vrf),
 207                      int (*disable)(struct vrf *vrf), int (*destroy)(struct vrf *vrf),
 208                      int (*update)(struct vrf *vrf));
 209
 210 /*
 211  * Call vrf_terminate when the protocol is being shutdown
 212  */
 213 extern void vrf_terminate(void);
 214
 215 /*
 216  * Utilities to create networks objects,
 217  * or call network operations
 218  */
 219
 220 /* Create a socket serving for the given VRF */
 221 extern int vrf_socket(int domain, int type, int protocol, vrf_id_t vrf_id,
 222                       char *name);
 223
 224 extern int vrf_sockunion_socket(const union sockunion *su, vrf_id_t vrf_id,
 225                                 char *name);
 226
 227 extern int vrf_bind(vrf_id_t vrf_id, int fd, char *name);
 228
 229 /* VRF ioctl operations */
 230 extern int vrf_getaddrinfo(const char *node, const char *service,
 231                            const struct addrinfo *hints, struct addrinfo **res,
 232                            vrf_id_t vrf_id);
 233
 234 extern int vrf_ioctl(vrf_id_t vrf_id, int d, unsigned long request, char *args);
 235
 236 /* function called by macro VRF_DEFAULT
 237  * to get the default VRF_ID
 238  */
 239 extern vrf_id_t vrf_get_default_id(void);
 240 /* The default VRF ID */
 241 #define VRF_DEFAULT vrf_get_default_id()
 242
 243 extern void vrf_set_default_name(const char *default_name, bool force);
 244 extern const char *vrf_get_default_name(void);
 245 #define VRF_DEFAULT_NAME    vrf_get_default_name()
 246
 247 /* VRF switch from NETNS */
 248 extern int vrf_switch_to_netns(vrf_id_t vrf_id);
 249 extern int vrf_switchback_to_initial(void);
 250
 251 /*
 252  * VRF backend routines
 253  * should be called from zebra only
 254  */
 255
 256 /* VRF vty command initialisation
 257  */
 258 extern void vrf_cmd_init(int (*writefunc)(struct vty *vty),
 259                          struct zebra_privs_t *daemon_priv);
 260
 261 /* VRF vty debugging
 262  */
 263 extern void vrf_install_commands(void);
 264
 265 /*
 266  * VRF utilities
 267  */
 268
 269 /* API for configuring VRF backend
 270  * should be called from zebra only
 271  */
 272 extern void vrf_configure_backend(int vrf_backend_netns);
 273 extern int vrf_get_backend(void);
 274 extern int vrf_is_backend_netns(void);
 275
 276
 277 /* API to create a VRF. either from vty
 278  * or through discovery
 279  */
 280 extern int vrf_handler_create(struct vty *vty, const char *name,
 281                               struct vrf **vrf);
 282
 283 /* API to associate a VRF with a NETNS.
 284  * called either from vty or through discovery
 285  * should be called from zebra only
 286  */
 287 extern int vrf_netns_handler_create(struct vty *vty, struct vrf *vrf,
 288                                     char *pathname, ns_id_t ext_ns_id,
 289                                     ns_id_t ns_id);
 290
 291 /* used internally to enable or disable VRF.
 292  * Notify a change in the VRF ID of the VRF
 293  */
 294 extern void vrf_disable(struct vrf *vrf);
 295 extern int vrf_enable(struct vrf *vrf);
 296 extern void vrf_delete(struct vrf *vrf);
 297 extern vrf_id_t vrf_generate_id(void);
 298
 299 #ifdef __cplusplus
 300 }
 301 #endif
 302
 303 #endif /*_ZEBRA_VRF_H*/