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 vrf_import_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  85                                 afi_t afi, safi_t safi);
  86 void vrf_unimport_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  87                            afi_t afi, safi_t safi);
  88
  89 static inline bool is_bgp_vrf_mplsvpn(struct bgp *bgp)
  90 {
  91         afi_t afi;
  92
  93         if (bgp->inst_type == BGP_INSTANCE_TYPE_VRF)
  94                 for (afi = 0; afi < AFI_MAX; ++afi) {
  95                         if (CHECK_FLAG(bgp->af_flags[afi][SAFI_UNICAST],
  96                                        BGP_CONFIG_VRF_TO_MPLSVPN_EXPORT)
  97                             || CHECK_FLAG(bgp->af_flags[afi][SAFI_UNICAST],
  98                                           BGP_CONFIG_MPLSVPN_TO_VRF_IMPORT))
  99                                 return true;
 100                 }
 101         return false;
 102 }
 103
 104 static inline int vpn_leak_to_vpn_active(struct bgp *bgp_vrf, afi_t afi,
 105                                          const char **pmsg)
 106 {
 107         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
 108                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
 109
 110                 if (pmsg)
 111                         *pmsg = "source bgp instance neither vrf nor default";
 112                 return 0;
 113         }
 114
 115         /* Is vrf configured to export to vpn? */
 116         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 117                         BGP_CONFIG_VRF_TO_MPLSVPN_EXPORT)
 118             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 119                            BGP_CONFIG_VRF_TO_VRF_EXPORT)) {
 120                 if (pmsg)
 121                         *pmsg = "export not set";
 122                 return 0;
 123         }
 124
 125         /* Is there an RT list set? */
 126         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_TOVPN]) {
 127                 if (pmsg)
 128                         *pmsg = "rtlist tovpn not defined";
 129                 return 0;
 130         }
 131
 132         /* Is there an RD set? */
 133         if (!CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 134                         BGP_VPN_POLICY_TOVPN_RD_SET)) {
 135                 if (pmsg)
 136                         *pmsg = "rd not defined";
 137                 return 0;
 138         }
 139
 140         /* Is a route-map specified, but not defined? */
 141         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_TOVPN] &&
 142                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_TOVPN]) {
 143                 if (pmsg)
 144                         *pmsg = "route-map tovpn named but not defined";
 145                 return 0;
 146         }
 147
 148         /* Is there an "auto" export label that isn't allocated yet? */
 149         if (CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 150                 BGP_VPN_POLICY_TOVPN_LABEL_AUTO) &&
 151                 (bgp_vrf->vpn_policy[afi].tovpn_label == MPLS_LABEL_NONE)) {
 152
 153                 if (pmsg)
 154                         *pmsg = "auto label not allocated";
 155                 return 0;
 156         }
 157
 158         return 1;
 159 }
 160
 161 static inline int vpn_leak_from_vpn_active(struct bgp *bgp_vrf, afi_t afi,
 162                                            const char **pmsg)
 163 {
 164         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
 165                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
 166
 167                 if (pmsg)
 168                         *pmsg = "destination bgp instance neither vrf nor default";
 169                 return 0;
 170         }
 171
 172         if (bgp_vrf->vrf_id == VRF_UNKNOWN) {
 173                 if (pmsg)
 174                         *pmsg = "destination bgp instance vrf is VRF_UNKNOWN";
 175                 return 0;
 176         }
 177
 178         /* Is vrf configured to import from vpn? */
 179         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 180                         BGP_CONFIG_MPLSVPN_TO_VRF_IMPORT)
 181             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 182                            BGP_CONFIG_VRF_TO_VRF_IMPORT)) {
 183                 if (pmsg)
 184                         *pmsg = "import not set";
 185                 return 0;
 186         }
 187
 188         /* Is there an RT list set? */
 189         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_FROMVPN]) {
 190                 if (pmsg)
 191                         *pmsg = "rtlist fromvpn not defined";
 192                 return 0;
 193         }
 194
 195         /* Is a route-map specified, but not defined? */
 196         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_FROMVPN] &&
 197                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_FROMVPN]) {
 198                 if (pmsg)
 199                         *pmsg = "route-map fromvpn named but not defined";
 200                 return 0;
 201         }
 202         return 1;
 203 }
 204
 205 static inline void vpn_leak_prechange(vpn_policy_direction_t direction,
 206                                       afi_t afi, struct bgp *bgp_vpn,
 207                                       struct bgp *bgp_vrf)
 208 {
 209         /* Detect when default bgp instance is not (yet) defined by config */
 210         if (!bgp_vpn)
 211                 return;
 212
 213         if ((direction == BGP_VPN_POLICY_DIR_FROMVPN) &&
 214                 vpn_leak_from_vpn_active(bgp_vrf, afi, NULL)) {
 215
 216                 vpn_leak_to_vrf_withdraw_all(bgp_vrf, afi);
 217         }
 218         if ((direction == BGP_VPN_POLICY_DIR_TOVPN) &&
 219                 vpn_leak_to_vpn_active(bgp_vrf, afi, NULL)) {
 220
 221                 vpn_leak_from_vrf_withdraw_all(bgp_vpn, bgp_vrf, afi);
 222         }
 223 }
 224
 225 static inline void vpn_leak_postchange(vpn_policy_direction_t direction,
 226                                        afi_t afi, struct bgp *bgp_vpn,
 227                                        struct bgp *bgp_vrf)
 228 {
 229         /* Detect when default bgp instance is not (yet) defined by config */
 230         if (!bgp_vpn)
 231                 return;
 232
 233         if (direction == BGP_VPN_POLICY_DIR_FROMVPN)
 234                 vpn_leak_to_vrf_update_all(bgp_vrf, bgp_vpn, afi);
 235         if (direction == BGP_VPN_POLICY_DIR_TOVPN) {
 236
 237                 if (bgp_vrf->vpn_policy[afi].tovpn_label !=
 238                         bgp_vrf->vpn_policy[afi]
 239                                .tovpn_zebra_vrf_label_last_sent) {
 240                         vpn_leak_zebra_vrf_label_update(bgp_vrf, afi);
 241                 }
 242
 243                 if (!bgp_vrf->vpn_policy[afi].tovpn_sid)
 244                         ensure_vrf_tovpn_sid(bgp_vpn, bgp_vrf, afi);
 245
 246                 if (sid_diff(bgp_vrf->vpn_policy[afi].tovpn_sid,
 247                              bgp_vrf->vpn_policy[afi]
 248                                      .tovpn_zebra_vrf_sid_last_sent)) {
 249                         vpn_leak_zebra_vrf_sid_update(bgp_vrf, afi);
 250                 }
 251
 252                 vpn_leak_from_vrf_update_all(bgp_vpn, bgp_vrf, afi);
 253         }
 254 }
 255
 256 /* Flag if the route is injectable into VPN. This would be either a
 257  * non-imported route or a non-VPN imported route.
 258  */
 259 static inline bool is_route_injectable_into_vpn(struct bgp_path_info *pi)
 260 {
 261         struct bgp_path_info *parent_pi;
 262         struct bgp_table *table;
 263         struct bgp_dest *dest;
 264
 265         if (pi->sub_type != BGP_ROUTE_IMPORTED ||
 266             !pi->extra ||
 267             !pi->extra->parent)
 268                 return true;
 269
 270         parent_pi = (struct bgp_path_info *)pi->extra->parent;
 271         dest = parent_pi->net;
 272         if (!dest)
 273                 return true;
 274         table = bgp_dest_table(dest);
 275         if (table &&
 276             (table->afi == AFI_IP || table->afi == AFI_IP6) &&
 277             table->safi == SAFI_MPLS_VPN)
 278                 return false;
 279         return true;
 280 }
 281
 282 /* Flag if the route path's family is VPN. */
 283 static inline bool is_pi_family_vpn(struct bgp_path_info *pi)
 284 {
 285         return (is_pi_family_matching(pi, AFI_IP, SAFI_MPLS_VPN) ||
 286                 is_pi_family_matching(pi, AFI_IP6, SAFI_MPLS_VPN));
 287 }
 288
 289 extern void vpn_policy_routemap_event(const char *rmap_name);
 290
 291 extern vrf_id_t get_first_vrf_for_redirect_with_rt(struct ecommunity *eckey);
 292
 293 extern void vpn_leak_postchange_all(void);
 294 extern void vpn_handle_router_id_update(struct bgp *bgp, bool withdraw,
 295                                         bool is_config);
 296 extern void bgp_vpn_leak_unimport(struct bgp *from_bgp);
 297 extern void bgp_vpn_leak_export(struct bgp *from_bgp);
 298
 299 #endif /* _QUAGGA_BGP_MPLSVPN_H */