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                                                     \
  37         "Address Family\n"                                                     \
  38         "Address Family\n"
  39
  40 #define V4_HEADER                                                              \
  41         "   Network          Next Hop            Metric LocPrf Weight Path\n"
  42 #define V4_HEADER_TAG "   Network          Next Hop      In tag/Out tag\n"
  43 #define V4_HEADER_OVERLAY                                                      \
  44         "   Network          Next Hop      EthTag    Overlay Index   RouterMac\n"
  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
  77 extern void vpn_leak_to_vrf_withdraw(struct bgp *from_bgp,
  78                                      struct bgp_path_info *path_vpn);
  79
  80 extern void vpn_leak_zebra_vrf_label_update(struct bgp *bgp, afi_t afi);
  81 extern void vpn_leak_zebra_vrf_label_withdraw(struct bgp *bgp, afi_t afi);
  82 extern void vpn_leak_zebra_vrf_sid_update(struct bgp *bgp, afi_t afi);
  83 extern void vpn_leak_zebra_vrf_sid_withdraw(struct bgp *bgp, afi_t afi);
  84 extern int vpn_leak_label_callback(mpls_label_t label, void *lblid, bool alloc);
  85 extern void ensure_vrf_tovpn_sid(struct bgp *vpn, struct bgp *vrf, afi_t afi);
  86 extern void transpose_sid(struct in6_addr *sid, uint32_t label, uint8_t offset,
  87                           uint8_t size);
  88 extern void vrf_import_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  89                                 afi_t afi, safi_t safi);
  90 void vrf_unimport_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  91                            afi_t afi, safi_t safi);
  92
  93 static inline bool is_bgp_vrf_mplsvpn(struct bgp *bgp)
  94 {
  95         afi_t afi;
  96
  97         if (bgp->inst_type == BGP_INSTANCE_TYPE_VRF)
  98                 for (afi = 0; afi < AFI_MAX; ++afi) {
  99                         if (CHECK_FLAG(bgp->af_flags[afi][SAFI_UNICAST],
 100                                        BGP_CONFIG_VRF_TO_MPLSVPN_EXPORT)
 101                             || CHECK_FLAG(bgp->af_flags[afi][SAFI_UNICAST],
 102                                           BGP_CONFIG_MPLSVPN_TO_VRF_IMPORT))
 103                                 return true;
 104                 }
 105         return false;
 106 }
 107
 108 static inline int vpn_leak_to_vpn_active(struct bgp *bgp_vrf, afi_t afi,
 109                                          const char **pmsg)
 110 {
 111         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
 112                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
 113
 114                 if (pmsg)
 115                         *pmsg = "source bgp instance neither vrf nor default";
 116                 return 0;
 117         }
 118
 119         /* Is vrf configured to export to vpn? */
 120         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 121                         BGP_CONFIG_VRF_TO_MPLSVPN_EXPORT)
 122             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 123                            BGP_CONFIG_VRF_TO_VRF_EXPORT)) {
 124                 if (pmsg)
 125                         *pmsg = "export not set";
 126                 return 0;
 127         }
 128
 129         /* Is there an RT list set? */
 130         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_TOVPN]) {
 131                 if (pmsg)
 132                         *pmsg = "rtlist tovpn not defined";
 133                 return 0;
 134         }
 135
 136         /* Is there an RD set? */
 137         if (!CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 138                         BGP_VPN_POLICY_TOVPN_RD_SET)) {
 139                 if (pmsg)
 140                         *pmsg = "rd not defined";
 141                 return 0;
 142         }
 143
 144         /* Is a route-map specified, but not defined? */
 145         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_TOVPN] &&
 146                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_TOVPN]) {
 147                 if (pmsg)
 148                         *pmsg = "route-map tovpn named but not defined";
 149                 return 0;
 150         }
 151
 152         /* Is there an "auto" export label that isn't allocated yet? */
 153         if (CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 154                 BGP_VPN_POLICY_TOVPN_LABEL_AUTO) &&
 155                 (bgp_vrf->vpn_policy[afi].tovpn_label == MPLS_LABEL_NONE)) {
 156
 157                 if (pmsg)
 158                         *pmsg = "auto label not allocated";
 159                 return 0;
 160         }
 161
 162         return 1;
 163 }
 164
 165 static inline int vpn_leak_from_vpn_active(struct bgp *bgp_vrf, afi_t afi,
 166                                            const char **pmsg)
 167 {
 168         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
 169                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
 170
 171                 if (pmsg)
 172                         *pmsg = "destination bgp instance neither vrf nor default";
 173                 return 0;
 174         }
 175
 176         if (bgp_vrf->vrf_id == VRF_UNKNOWN) {
 177                 if (pmsg)
 178                         *pmsg = "destination bgp instance vrf is VRF_UNKNOWN";
 179                 return 0;
 180         }
 181
 182         /* Is vrf configured to import from vpn? */
 183         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 184                         BGP_CONFIG_MPLSVPN_TO_VRF_IMPORT)
 185             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 186                            BGP_CONFIG_VRF_TO_VRF_IMPORT)) {
 187                 if (pmsg)
 188                         *pmsg = "import not set";
 189                 return 0;
 190         }
 191
 192         /* Is there an RT list set? */
 193         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_FROMVPN]) {
 194                 if (pmsg)
 195                         *pmsg = "rtlist fromvpn not defined";
 196                 return 0;
 197         }
 198
 199         /* Is a route-map specified, but not defined? */
 200         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_FROMVPN] &&
 201                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_FROMVPN]) {
 202                 if (pmsg)
 203                         *pmsg = "route-map fromvpn named but not defined";
 204                 return 0;
 205         }
 206         return 1;
 207 }
 208
 209 static inline void vpn_leak_prechange(enum vpn_policy_direction direction,
 210                                       afi_t afi, struct bgp *bgp_vpn,
 211                                       struct bgp *bgp_vrf)
 212 {
 213         /* Detect when default bgp instance is not (yet) defined by config */
 214         if (!bgp_vpn)
 215                 return;
 216
 217         if ((direction == BGP_VPN_POLICY_DIR_FROMVPN) &&
 218                 vpn_leak_from_vpn_active(bgp_vrf, afi, NULL)) {
 219
 220                 vpn_leak_to_vrf_withdraw_all(bgp_vrf, afi);
 221         }
 222         if ((direction == BGP_VPN_POLICY_DIR_TOVPN) &&
 223                 vpn_leak_to_vpn_active(bgp_vrf, afi, NULL)) {
 224
 225                 vpn_leak_from_vrf_withdraw_all(bgp_vpn, bgp_vrf, afi);
 226         }
 227 }
 228
 229 static inline void vpn_leak_postchange(enum vpn_policy_direction direction,
 230                                        afi_t afi, struct bgp *bgp_vpn,
 231                                        struct bgp *bgp_vrf)
 232 {
 233         /* Detect when default bgp instance is not (yet) defined by config */
 234         if (!bgp_vpn)
 235                 return;
 236
 237         if (direction == BGP_VPN_POLICY_DIR_FROMVPN) {
 238                 /* trigger a flush to re-sync with ADJ-RIB-in */
 239                 if (!CHECK_FLAG(bgp_vpn->af_flags[afi][SAFI_MPLS_VPN],
 240                                 BGP_VPNVX_RETAIN_ROUTE_TARGET_ALL))
 241                         bgp_clear_soft_in(bgp_vpn, afi, SAFI_MPLS_VPN);
 242                 else
 243                         vpn_leak_to_vrf_update_all(bgp_vrf, bgp_vpn, afi);
 244         }
 245         if (direction == BGP_VPN_POLICY_DIR_TOVPN) {
 246
 247                 if (bgp_vrf->vpn_policy[afi].tovpn_label !=
 248                         bgp_vrf->vpn_policy[afi]
 249                                .tovpn_zebra_vrf_label_last_sent) {
 250                         vpn_leak_zebra_vrf_label_update(bgp_vrf, afi);
 251                 }
 252
 253                 if (!bgp_vrf->vpn_policy[afi].tovpn_sid)
 254                         ensure_vrf_tovpn_sid(bgp_vpn, bgp_vrf, afi);
 255
 256                 if (!bgp_vrf->vpn_policy[afi].tovpn_sid
 257                     && bgp_vrf->vpn_policy[afi].tovpn_zebra_vrf_sid_last_sent)
 258                         vpn_leak_zebra_vrf_sid_withdraw(bgp_vrf, afi);
 259
 260                 if (sid_diff(bgp_vrf->vpn_policy[afi].tovpn_sid,
 261                              bgp_vrf->vpn_policy[afi]
 262                                      .tovpn_zebra_vrf_sid_last_sent)) {
 263                         vpn_leak_zebra_vrf_sid_update(bgp_vrf, afi);
 264                 }
 265
 266                 vpn_leak_from_vrf_update_all(bgp_vpn, bgp_vrf, afi);
 267         }
 268 }
 269
 270 /* Flag if the route is injectable into VPN. This would be either a
 271  * non-imported route or a non-VPN imported route.
 272  */
 273 static inline bool is_route_injectable_into_vpn(struct bgp_path_info *pi)
 274 {
 275         struct bgp_path_info *parent_pi;
 276         struct bgp_table *table;
 277         struct bgp_dest *dest;
 278
 279         if (pi->sub_type != BGP_ROUTE_IMPORTED ||
 280             !pi->extra ||
 281             !pi->extra->parent)
 282                 return true;
 283
 284         parent_pi = (struct bgp_path_info *)pi->extra->parent;
 285         dest = parent_pi->net;
 286         if (!dest)
 287                 return true;
 288         table = bgp_dest_table(dest);
 289         if (table &&
 290             (table->afi == AFI_IP || table->afi == AFI_IP6) &&
 291             table->safi == SAFI_MPLS_VPN)
 292                 return false;
 293         return true;
 294 }
 295
 296 /* Flag if the route path's family is VPN. */
 297 static inline bool is_pi_family_vpn(struct bgp_path_info *pi)
 298 {
 299         return (is_pi_family_matching(pi, AFI_IP, SAFI_MPLS_VPN) ||
 300                 is_pi_family_matching(pi, AFI_IP6, SAFI_MPLS_VPN));
 301 }
 302
 303 extern void vpn_policy_routemap_event(const char *rmap_name);
 304
 305 extern vrf_id_t get_first_vrf_for_redirect_with_rt(struct ecommunity *eckey);
 306
 307 extern void vpn_leak_postchange_all(void);
 308 extern void vpn_handle_router_id_update(struct bgp *bgp, bool withdraw,
 309                                         bool is_config);
 310 extern void bgp_vpn_leak_unimport(struct bgp *from_bgp);
 311 extern void bgp_vpn_leak_export(struct bgp *from_bgp);
 312
 313 #endif /* _QUAGGA_BGP_MPLSVPN_H */