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_attr.h"
  25 #include "bgpd/bgp_route.h"
  26 #include "bgpd/bgp_rd.h"
  27 #include "bgpd/bgp_zebra.h"
  28 #include "bgpd/bgp_vty.h"
  29
  30 #define MPLS_LABEL_IS_SPECIAL(label) ((label) <= MPLS_LABEL_EXTENSION)
  31 #define MPLS_LABEL_IS_NULL(label)                                              \
  32         ((label) == MPLS_LABEL_IPV4_EXPLICIT_NULL                              \
  33          || (label) == MPLS_LABEL_IPV6_EXPLICIT_NULL                           \
  34          || (label) == MPLS_LABEL_IMPLICIT_NULL)
  35
  36 #define BGP_VPNVX_HELP_STR BGP_AF_STR BGP_AF_STR
  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 #define BGP_PREFIX_SID_SRV6_MAX_FUNCTION_LENGTH 20
  45
  46 extern void bgp_mplsvpn_init(void);
  47 extern int bgp_nlri_parse_vpn(struct peer *, struct attr *, struct bgp_nlri *);
  48 extern uint32_t decode_label(mpls_label_t *);
  49 extern void encode_label(mpls_label_t, mpls_label_t *);
  50
  51 extern int argv_find_and_parse_vpnvx(struct cmd_token **argv, int argc,
  52                                      int *index, afi_t *afi);
  53 extern int bgp_show_mpls_vpn(struct vty *vty, afi_t afi, struct prefix_rd *prd,
  54                              enum bgp_show_type type, void *output_arg,
  55                              int tags, bool use_json);
  56
  57 extern void vpn_leak_from_vrf_update(struct bgp *to_bgp, struct bgp *from_bgp,
  58                                      struct bgp_path_info *path_vrf);
  59
  60 extern void vpn_leak_from_vrf_withdraw(struct bgp *to_bgp, struct bgp *from_bgp,
  61                                        struct bgp_path_info *path_vrf);
  62
  63 extern void vpn_leak_from_vrf_withdraw_all(struct bgp *to_bgp,
  64                                            struct bgp *from_bgp, afi_t afi);
  65
  66 extern void vpn_leak_from_vrf_update_all(struct bgp *to_bgp,
  67                                          struct bgp *from_bgp, afi_t afi);
  68
  69 extern void vpn_leak_to_vrf_withdraw_all(struct bgp *to_bgp, afi_t afi);
  70
  71 extern void vpn_leak_to_vrf_update_all(struct bgp *to_bgp, struct bgp *from_bgp,
  72                                        afi_t afi);
  73
  74 extern bool vpn_leak_to_vrf_update(struct bgp *from_bgp,
  75                                    struct bgp_path_info *path_vpn,
  76                                    struct prefix_rd *prd);
  77
  78 extern void vpn_leak_to_vrf_withdraw(struct bgp *from_bgp,
  79                                      struct bgp_path_info *path_vpn);
  80
  81 extern void vpn_leak_zebra_vrf_label_update(struct bgp *bgp, afi_t afi);
  82 extern void vpn_leak_zebra_vrf_label_withdraw(struct bgp *bgp, afi_t afi);
  83 extern void vpn_leak_zebra_vrf_sid_update(struct bgp *bgp, afi_t afi);
  84 extern void vpn_leak_zebra_vrf_sid_withdraw(struct bgp *bgp, afi_t afi);
  85 extern int vpn_leak_label_callback(mpls_label_t label, void *lblid, bool alloc);
  86 extern void ensure_vrf_tovpn_sid(struct bgp *vpn, struct bgp *vrf, afi_t afi);
  87 extern void transpose_sid(struct in6_addr *sid, uint32_t label, uint8_t offset,
  88                           uint8_t size);
  89 extern void vrf_import_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  90                                 afi_t afi, safi_t safi);
  91 void vrf_unimport_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  92                            afi_t afi, safi_t safi);
  93
  94 static inline bool is_bgp_vrf_mplsvpn(struct bgp *bgp)
  95 {
  96         afi_t afi;
  97
  98         if (bgp->inst_type == BGP_INSTANCE_TYPE_VRF)
  99                 for (afi = 0; afi < AFI_MAX; ++afi) {
 100                         if (CHECK_FLAG(bgp->af_flags[afi][SAFI_UNICAST],
 101                                        BGP_CONFIG_VRF_TO_MPLSVPN_EXPORT)
 102                             || CHECK_FLAG(bgp->af_flags[afi][SAFI_UNICAST],
 103                                           BGP_CONFIG_MPLSVPN_TO_VRF_IMPORT))
 104                                 return true;
 105                 }
 106         return false;
 107 }
 108
 109 static inline int vpn_leak_to_vpn_active(struct bgp *bgp_vrf, afi_t afi,
 110                                          const char **pmsg)
 111 {
 112         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
 113                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
 114
 115                 if (pmsg)
 116                         *pmsg = "source bgp instance neither vrf nor default";
 117                 return 0;
 118         }
 119
 120         /* Is vrf configured to export to vpn? */
 121         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 122                         BGP_CONFIG_VRF_TO_MPLSVPN_EXPORT)
 123             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 124                            BGP_CONFIG_VRF_TO_VRF_EXPORT)) {
 125                 if (pmsg)
 126                         *pmsg = "export not set";
 127                 return 0;
 128         }
 129
 130         /* Is there an RT list set? */
 131         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_TOVPN]) {
 132                 if (pmsg)
 133                         *pmsg = "rtlist tovpn not defined";
 134                 return 0;
 135         }
 136
 137         /* Is there an RD set? */
 138         if (!CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 139                         BGP_VPN_POLICY_TOVPN_RD_SET)) {
 140                 if (pmsg)
 141                         *pmsg = "rd not defined";
 142                 return 0;
 143         }
 144
 145         /* Is a route-map specified, but not defined? */
 146         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_TOVPN] &&
 147                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_TOVPN]) {
 148                 if (pmsg)
 149                         *pmsg = "route-map tovpn named but not defined";
 150                 return 0;
 151         }
 152
 153         /* Is there an "auto" export label that isn't allocated yet? */
 154         if (CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 155                 BGP_VPN_POLICY_TOVPN_LABEL_AUTO) &&
 156                 (bgp_vrf->vpn_policy[afi].tovpn_label == MPLS_LABEL_NONE)) {
 157
 158                 if (pmsg)
 159                         *pmsg = "auto label not allocated";
 160                 return 0;
 161         }
 162
 163         return 1;
 164 }
 165
 166 static inline int vpn_leak_from_vpn_active(struct bgp *bgp_vrf, afi_t afi,
 167                                            const char **pmsg)
 168 {
 169         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
 170                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
 171
 172                 if (pmsg)
 173                         *pmsg = "destination bgp instance neither vrf nor default";
 174                 return 0;
 175         }
 176
 177         if (bgp_vrf->vrf_id == VRF_UNKNOWN) {
 178                 if (pmsg)
 179                         *pmsg = "destination bgp instance vrf is VRF_UNKNOWN";
 180                 return 0;
 181         }
 182
 183         /* Is vrf configured to import from vpn? */
 184         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 185                         BGP_CONFIG_MPLSVPN_TO_VRF_IMPORT)
 186             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 187                            BGP_CONFIG_VRF_TO_VRF_IMPORT)) {
 188                 if (pmsg)
 189                         *pmsg = "import not set";
 190                 return 0;
 191         }
 192
 193         /* Is there an RT list set? */
 194         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_FROMVPN]) {
 195                 if (pmsg)
 196                         *pmsg = "rtlist fromvpn not defined";
 197                 return 0;
 198         }
 199
 200         /* Is a route-map specified, but not defined? */
 201         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_FROMVPN] &&
 202                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_FROMVPN]) {
 203                 if (pmsg)
 204                         *pmsg = "route-map fromvpn named but not defined";
 205                 return 0;
 206         }
 207         return 1;
 208 }
 209
 210 static inline void vpn_leak_prechange(enum vpn_policy_direction direction,
 211                                       afi_t afi, struct bgp *bgp_vpn,
 212                                       struct bgp *bgp_vrf)
 213 {
 214         /* Detect when default bgp instance is not (yet) defined by config */
 215         if (!bgp_vpn)
 216                 return;
 217
 218         if ((direction == BGP_VPN_POLICY_DIR_FROMVPN) &&
 219                 vpn_leak_from_vpn_active(bgp_vrf, afi, NULL)) {
 220
 221                 vpn_leak_to_vrf_withdraw_all(bgp_vrf, afi);
 222         }
 223         if ((direction == BGP_VPN_POLICY_DIR_TOVPN) &&
 224                 vpn_leak_to_vpn_active(bgp_vrf, afi, NULL)) {
 225
 226                 vpn_leak_from_vrf_withdraw_all(bgp_vpn, bgp_vrf, afi);
 227         }
 228 }
 229
 230 static inline void vpn_leak_postchange(enum vpn_policy_direction direction,
 231                                        afi_t afi, struct bgp *bgp_vpn,
 232                                        struct bgp *bgp_vrf)
 233 {
 234         /* Detect when default bgp instance is not (yet) defined by config */
 235         if (!bgp_vpn)
 236                 return;
 237
 238         if (direction == BGP_VPN_POLICY_DIR_FROMVPN) {
 239                 /* trigger a flush to re-sync with ADJ-RIB-in */
 240                 if (!CHECK_FLAG(bgp_vpn->af_flags[afi][SAFI_MPLS_VPN],
 241                                 BGP_VPNVX_RETAIN_ROUTE_TARGET_ALL))
 242                         bgp_clear_soft_in(bgp_vpn, afi, SAFI_MPLS_VPN);
 243                 else
 244                         vpn_leak_to_vrf_update_all(bgp_vrf, bgp_vpn, afi);
 245         }
 246         if (direction == BGP_VPN_POLICY_DIR_TOVPN) {
 247
 248                 if (bgp_vrf->vpn_policy[afi].tovpn_label !=
 249                         bgp_vrf->vpn_policy[afi]
 250                                .tovpn_zebra_vrf_label_last_sent) {
 251                         vpn_leak_zebra_vrf_label_update(bgp_vrf, afi);
 252                 }
 253
 254                 if (!bgp_vrf->vpn_policy[afi].tovpn_sid)
 255                         ensure_vrf_tovpn_sid(bgp_vpn, bgp_vrf, afi);
 256
 257                 if (!bgp_vrf->vpn_policy[afi].tovpn_sid
 258                     && bgp_vrf->vpn_policy[afi].tovpn_zebra_vrf_sid_last_sent)
 259                         vpn_leak_zebra_vrf_sid_withdraw(bgp_vrf, afi);
 260
 261                 if (sid_diff(bgp_vrf->vpn_policy[afi].tovpn_sid,
 262                              bgp_vrf->vpn_policy[afi]
 263                                      .tovpn_zebra_vrf_sid_last_sent)) {
 264                         vpn_leak_zebra_vrf_sid_update(bgp_vrf, afi);
 265                 }
 266
 267                 vpn_leak_from_vrf_update_all(bgp_vpn, bgp_vrf, afi);
 268         }
 269 }
 270
 271 /* Flag if the route is injectable into VPN. This would be either a
 272  * non-imported route or a non-VPN imported route.
 273  */
 274 static inline bool is_route_injectable_into_vpn(struct bgp_path_info *pi)
 275 {
 276         struct bgp_path_info *parent_pi;
 277         struct bgp_table *table;
 278         struct bgp_dest *dest;
 279
 280         if (pi->sub_type != BGP_ROUTE_IMPORTED ||
 281             !pi->extra ||
 282             !pi->extra->parent)
 283                 return true;
 284
 285         parent_pi = (struct bgp_path_info *)pi->extra->parent;
 286         dest = parent_pi->net;
 287         if (!dest)
 288                 return true;
 289         table = bgp_dest_table(dest);
 290         if (table &&
 291             (table->afi == AFI_IP || table->afi == AFI_IP6) &&
 292             table->safi == SAFI_MPLS_VPN)
 293                 return false;
 294         return true;
 295 }
 296
 297 /* Flag if the route path's family is VPN. */
 298 static inline bool is_pi_family_vpn(struct bgp_path_info *pi)
 299 {
 300         return (is_pi_family_matching(pi, AFI_IP, SAFI_MPLS_VPN) ||
 301                 is_pi_family_matching(pi, AFI_IP6, SAFI_MPLS_VPN));
 302 }
 303
 304 extern void vpn_policy_routemap_event(const char *rmap_name);
 305
 306 extern vrf_id_t get_first_vrf_for_redirect_with_rt(struct ecommunity *eckey);
 307
 308 extern void vpn_leak_postchange_all(void);
 309 extern void vpn_handle_router_id_update(struct bgp *bgp, bool withdraw,
 310                                         bool is_config);
 311 extern void bgp_vpn_leak_unimport(struct bgp *from_bgp);
 312 extern void bgp_vpn_leak_export(struct bgp *from_bgp);
 313
 314 #endif /* _QUAGGA_BGP_MPLSVPN_H */