bgpd/bgp_mplsvpn.h

   1 /* MPLS-VPN
   2  * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
   3  *
   4  * This file is part of GxNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more 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 #ifndef _QUAGGA_BGP_MPLSVPN_H
  22 #define _QUAGGA_BGP_MPLSVPN_H
  23
  24 #include "bgpd/bgp_route.h"
  25 #include "bgpd/bgp_rd.h"
  26 #include "bgpd/bgp_zebra.h"
  27
  28 #define MPLS_LABEL_IS_SPECIAL(label) ((label) <= MPLS_LABEL_EXTENSION)
  29 #define MPLS_LABEL_IS_NULL(label)                                              \
  30         ((label) == MPLS_LABEL_IPV4_EXPLICIT_NULL                              \
  31          || (label) == MPLS_LABEL_IPV6_EXPLICIT_NULL                           \
  32          || (label) == MPLS_LABEL_IMPLICIT_NULL)
  33
  34 #define BGP_VPNVX_HELP_STR                                                     \
  35         "Address Family\n"                                                     \
  36         "Address Family\n"
  37
  38 #define V4_HEADER                                                              \
  39         "   Network          Next Hop            Metric LocPrf Weight Path\n"
  40 #define V4_HEADER_TAG "   Network          Next Hop      In tag/Out tag\n"
  41 #define V4_HEADER_OVERLAY                                                      \
  42         "   Network          Next Hop      EthTag    Overlay Index   RouterMac\n"
  43
  44 extern void bgp_mplsvpn_init(void);
  45 extern int bgp_nlri_parse_vpn(struct peer *, struct attr *, struct bgp_nlri *);
  46 extern uint32_t decode_label(mpls_label_t *);
  47 extern void encode_label(mpls_label_t, mpls_label_t *);
  48
  49 extern int argv_find_and_parse_vpnvx(struct cmd_token **argv, int argc,
  50                                      int *index, afi_t *afi);
  51 extern int bgp_show_mpls_vpn(struct vty *vty, afi_t afi, struct prefix_rd *prd,
  52                              enum bgp_show_type type, void *output_arg,
  53                              int tags, bool use_json);
  54
  55 extern void vpn_leak_from_vrf_update(struct bgp *bgp_vpn, struct bgp *bgp_vrf,
  56                                      struct bgp_path_info *path_vrf);
  57
  58 extern void vpn_leak_from_vrf_withdraw(struct bgp *bgp_vpn, struct bgp *bgp_vrf,
  59                                        struct bgp_path_info *path_vrf);
  60
  61 extern void vpn_leak_from_vrf_withdraw_all(struct bgp *bgp_vpn,
  62                                            struct bgp *bgp_vrf, afi_t afi);
  63
  64 extern void vpn_leak_from_vrf_update_all(struct bgp *bgp_vpn,
  65                                          struct bgp *bgp_vrf, afi_t afi);
  66
  67 extern void vpn_leak_to_vrf_withdraw_all(struct bgp *bgp_vrf, afi_t afi);
  68
  69 extern void vpn_leak_to_vrf_update_all(struct bgp *bgp_vrf, struct bgp *bgp_vpn,
  70                                        afi_t afi);
  71
  72 extern void vpn_leak_to_vrf_update(struct bgp *bgp_vpn,
  73                                    struct bgp_path_info *path_vpn);
  74
  75 extern void vpn_leak_to_vrf_withdraw(struct bgp *bgp_vpn,
  76                                      struct bgp_path_info *path_vpn);
  77
  78 extern void vpn_leak_zebra_vrf_label_update(struct bgp *bgp, afi_t afi);
  79 extern void vpn_leak_zebra_vrf_label_withdraw(struct bgp *bgp, afi_t afi);
  80 extern void vpn_leak_zebra_vrf_sid_update(struct bgp *bgp, afi_t afi);
  81 extern void vpn_leak_zebra_vrf_sid_withdraw(struct bgp *bgp, afi_t afi);
  82 extern int vpn_leak_label_callback(mpls_label_t label, void *lblid, bool alloc);
  83 extern void ensure_vrf_tovpn_sid(struct bgp *vpn, struct bgp *vrf, afi_t afi);
  84 extern void transpose_sid(struct in6_addr *sid, uint32_t label, uint8_t offset,
  85                           uint8_t size);
  86 extern void vrf_import_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  87                                 afi_t afi, safi_t safi);
  88 void vrf_unimport_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  89                            afi_t afi, safi_t safi);
  90
  91 static inline bool is_bgp_vrf_mplsvpn(struct bgp *bgp)
  92 {
  93         afi_t afi;
  94
  95         if (bgp->inst_type == BGP_INSTANCE_TYPE_VRF)
  96                 for (afi = 0; afi < AFI_MAX; ++afi) {
  97                         if (CHECK_FLAG(bgp->af_flags[afi][SAFI_UNICAST],
  98                                        BGP_CONFIG_VRF_TO_MPLSVPN_EXPORT)
  99                             || CHECK_FLAG(bgp->af_flags[afi][SAFI_UNICAST],
 100                                           BGP_CONFIG_MPLSVPN_TO_VRF_IMPORT))
 101                                 return true;
 102                 }
 103         return false;
 104 }
 105
 106 static inline int vpn_leak_to_vpn_active(struct bgp *bgp_vrf, afi_t afi,
 107                                          const char **pmsg)
 108 {
 109         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
 110                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
 111
 112                 if (pmsg)
 113                         *pmsg = "source bgp instance neither vrf nor default";
 114                 return 0;
 115         }
 116
 117         /* Is vrf configured to export to vpn? */
 118         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 119                         BGP_CONFIG_VRF_TO_MPLSVPN_EXPORT)
 120             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 121                            BGP_CONFIG_VRF_TO_VRF_EXPORT)) {
 122                 if (pmsg)
 123                         *pmsg = "export not set";
 124                 return 0;
 125         }
 126
 127         /* Is there an RT list set? */
 128         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_TOVPN]) {
 129                 if (pmsg)
 130                         *pmsg = "rtlist tovpn not defined";
 131                 return 0;
 132         }
 133
 134         /* Is there an RD set? */
 135         if (!CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 136                         BGP_VPN_POLICY_TOVPN_RD_SET)) {
 137                 if (pmsg)
 138                         *pmsg = "rd not defined";
 139                 return 0;
 140         }
 141
 142         /* Is a route-map specified, but not defined? */
 143         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_TOVPN] &&
 144                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_TOVPN]) {
 145                 if (pmsg)
 146                         *pmsg = "route-map tovpn named but not defined";
 147                 return 0;
 148         }
 149
 150         /* Is there an "auto" export label that isn't allocated yet? */
 151         if (CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 152                 BGP_VPN_POLICY_TOVPN_LABEL_AUTO) &&
 153                 (bgp_vrf->vpn_policy[afi].tovpn_label == MPLS_LABEL_NONE)) {
 154
 155                 if (pmsg)
 156                         *pmsg = "auto label not allocated";
 157                 return 0;
 158         }
 159
 160         return 1;
 161 }
 162
 163 static inline int vpn_leak_from_vpn_active(struct bgp *bgp_vrf, afi_t afi,
 164                                            const char **pmsg)
 165 {
 166         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
 167                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
 168
 169                 if (pmsg)
 170                         *pmsg = "destination bgp instance neither vrf nor default";
 171                 return 0;
 172         }
 173
 174         if (bgp_vrf->vrf_id == VRF_UNKNOWN) {
 175                 if (pmsg)
 176                         *pmsg = "destination bgp instance vrf is VRF_UNKNOWN";
 177                 return 0;
 178         }
 179
 180         /* Is vrf configured to import from vpn? */
 181         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 182                         BGP_CONFIG_MPLSVPN_TO_VRF_IMPORT)
 183             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 184                            BGP_CONFIG_VRF_TO_VRF_IMPORT)) {
 185                 if (pmsg)
 186                         *pmsg = "import not set";
 187                 return 0;
 188         }
 189
 190         /* Is there an RT list set? */
 191         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_FROMVPN]) {
 192                 if (pmsg)
 193                         *pmsg = "rtlist fromvpn not defined";
 194                 return 0;
 195         }
 196
 197         /* Is a route-map specified, but not defined? */
 198         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_FROMVPN] &&
 199                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_FROMVPN]) {
 200                 if (pmsg)
 201                         *pmsg = "route-map fromvpn named but not defined";
 202                 return 0;
 203         }
 204         return 1;
 205 }
 206
 207 static inline void vpn_leak_prechange(vpn_policy_direction_t direction,
 208                                       afi_t afi, struct bgp *bgp_vpn,
 209                                       struct bgp *bgp_vrf)
 210 {
 211         /* Detect when default bgp instance is not (yet) defined by config */
 212         if (!bgp_vpn)
 213                 return;
 214
 215         if ((direction == BGP_VPN_POLICY_DIR_FROMVPN) &&
 216                 vpn_leak_from_vpn_active(bgp_vrf, afi, NULL)) {
 217
 218                 vpn_leak_to_vrf_withdraw_all(bgp_vrf, afi);
 219         }
 220         if ((direction == BGP_VPN_POLICY_DIR_TOVPN) &&
 221                 vpn_leak_to_vpn_active(bgp_vrf, afi, NULL)) {
 222
 223                 vpn_leak_from_vrf_withdraw_all(bgp_vpn, bgp_vrf, afi);
 224         }
 225 }
 226
 227 static inline void vpn_leak_postchange(vpn_policy_direction_t direction,
 228                                        afi_t afi, struct bgp *bgp_vpn,
 229                                        struct bgp *bgp_vrf)
 230 {
 231         /* Detect when default bgp instance is not (yet) defined by config */
 232         if (!bgp_vpn)
 233                 return;
 234
 235         if (direction == BGP_VPN_POLICY_DIR_FROMVPN)
 236                 vpn_leak_to_vrf_update_all(bgp_vrf, bgp_vpn, afi);
 237         if (direction == BGP_VPN_POLICY_DIR_TOVPN) {
 238
 239                 if (bgp_vrf->vpn_policy[afi].tovpn_label !=
 240                         bgp_vrf->vpn_policy[afi]
 241                                .tovpn_zebra_vrf_label_last_sent) {
 242                         vpn_leak_zebra_vrf_label_update(bgp_vrf, afi);
 243                 }
 244
 245                 if (!bgp_vrf->vpn_policy[afi].tovpn_sid)
 246                         ensure_vrf_tovpn_sid(bgp_vpn, bgp_vrf, afi);
 247
 248                 if (sid_diff(bgp_vrf->vpn_policy[afi].tovpn_sid,
 249                              bgp_vrf->vpn_policy[afi]
 250                                      .tovpn_zebra_vrf_sid_last_sent)) {
 251                         vpn_leak_zebra_vrf_sid_update(bgp_vrf, afi);
 252                 }
 253
 254                 vpn_leak_from_vrf_update_all(bgp_vpn, bgp_vrf, afi);
 255         }
 256 }
 257
 258 /* Flag if the route is injectable into VPN. This would be either a
 259  * non-imported route or a non-VPN imported route.
 260  */
 261 static inline bool is_route_injectable_into_vpn(struct bgp_path_info *pi)
 262 {
 263         struct bgp_path_info *parent_pi;
 264         struct bgp_table *table;
 265         struct bgp_dest *dest;
 266
 267         if (pi->sub_type != BGP_ROUTE_IMPORTED ||
 268             !pi->extra ||
 269             !pi->extra->parent)
 270                 return true;
 271
 272         parent_pi = (struct bgp_path_info *)pi->extra->parent;
 273         dest = parent_pi->net;
 274         if (!dest)
 275                 return true;
 276         table = bgp_dest_table(dest);
 277         if (table &&
 278             (table->afi == AFI_IP || table->afi == AFI_IP6) &&
 279             table->safi == SAFI_MPLS_VPN)
 280                 return false;
 281         return true;
 282 }
 283
 284 /* Flag if the route path's family is VPN. */
 285 static inline bool is_pi_family_vpn(struct bgp_path_info *pi)
 286 {
 287         return (is_pi_family_matching(pi, AFI_IP, SAFI_MPLS_VPN) ||
 288                 is_pi_family_matching(pi, AFI_IP6, SAFI_MPLS_VPN));
 289 }
 290
 291 extern void vpn_policy_routemap_event(const char *rmap_name);
 292
 293 extern vrf_id_t get_first_vrf_for_redirect_with_rt(struct ecommunity *eckey);
 294
 295 extern void vpn_leak_postchange_all(void);
 296 extern void vpn_handle_router_id_update(struct bgp *bgp, bool withdraw,
 297                                         bool is_config);
 298 extern void bgp_vpn_leak_unimport(struct bgp *from_bgp);
 299 extern void bgp_vpn_leak_export(struct bgp *from_bgp);
 300
 301 #endif /* _QUAGGA_BGP_MPLSVPN_H */