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 int vpn_leak_label_callback(mpls_label_t label, void *lblid, bool alloc);
  81 extern void vrf_import_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  82                                 afi_t afi, safi_t safi);
  83 void vrf_unimport_from_vrf(struct bgp *to_bgp, struct bgp *from_bgp,
  84                            afi_t afi, safi_t safi);
  85
  86 static inline int vpn_leak_to_vpn_active(struct bgp *bgp_vrf, afi_t afi,
  87                                          const char **pmsg)
  88 {
  89         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
  90                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
  91
  92                 if (pmsg)
  93                         *pmsg = "source bgp instance neither vrf nor default";
  94                 return 0;
  95         }
  96
  97         /* Is vrf configured to export to vpn? */
  98         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
  99                         BGP_CONFIG_VRF_TO_MPLSVPN_EXPORT)
 100             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 101                            BGP_CONFIG_VRF_TO_VRF_EXPORT)) {
 102                 if (pmsg)
 103                         *pmsg = "export not set";
 104                 return 0;
 105         }
 106
 107         /* Is there an RT list set? */
 108         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_TOVPN]) {
 109                 if (pmsg)
 110                         *pmsg = "rtlist tovpn not defined";
 111                 return 0;
 112         }
 113
 114         /* Is there an RD set? */
 115         if (!CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 116                         BGP_VPN_POLICY_TOVPN_RD_SET)) {
 117                 if (pmsg)
 118                         *pmsg = "rd not defined";
 119                 return 0;
 120         }
 121
 122         /* Is a route-map specified, but not defined? */
 123         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_TOVPN] &&
 124                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_TOVPN]) {
 125                 if (pmsg)
 126                         *pmsg = "route-map tovpn named but not defined";
 127                 return 0;
 128         }
 129
 130         /* Is there an "auto" export label that isn't allocated yet? */
 131         if (CHECK_FLAG(bgp_vrf->vpn_policy[afi].flags,
 132                 BGP_VPN_POLICY_TOVPN_LABEL_AUTO) &&
 133                 (bgp_vrf->vpn_policy[afi].tovpn_label == MPLS_LABEL_NONE)) {
 134
 135                 if (pmsg)
 136                         *pmsg = "auto label not allocated";
 137                 return 0;
 138         }
 139
 140         return 1;
 141 }
 142
 143 static inline int vpn_leak_from_vpn_active(struct bgp *bgp_vrf, afi_t afi,
 144                                            const char **pmsg)
 145 {
 146         if (bgp_vrf->inst_type != BGP_INSTANCE_TYPE_VRF
 147                 && bgp_vrf->inst_type != BGP_INSTANCE_TYPE_DEFAULT) {
 148
 149                 if (pmsg)
 150                         *pmsg = "destination bgp instance neither vrf nor default";
 151                 return 0;
 152         }
 153
 154         if (bgp_vrf->vrf_id == VRF_UNKNOWN) {
 155                 if (pmsg)
 156                         *pmsg = "destination bgp instance vrf is VRF_UNKNOWN";
 157                 return 0;
 158         }
 159
 160         /* Is vrf configured to import from vpn? */
 161         if (!CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 162                         BGP_CONFIG_MPLSVPN_TO_VRF_IMPORT)
 163             && !CHECK_FLAG(bgp_vrf->af_flags[afi][SAFI_UNICAST],
 164                            BGP_CONFIG_VRF_TO_VRF_IMPORT)) {
 165                 if (pmsg)
 166                         *pmsg = "import not set";
 167                 return 0;
 168         }
 169
 170         /* Is there an RT list set? */
 171         if (!bgp_vrf->vpn_policy[afi].rtlist[BGP_VPN_POLICY_DIR_FROMVPN]) {
 172                 if (pmsg)
 173                         *pmsg = "rtlist fromvpn not defined";
 174                 return 0;
 175         }
 176
 177         /* Is a route-map specified, but not defined? */
 178         if (bgp_vrf->vpn_policy[afi].rmap_name[BGP_VPN_POLICY_DIR_FROMVPN] &&
 179                 !bgp_vrf->vpn_policy[afi].rmap[BGP_VPN_POLICY_DIR_FROMVPN]) {
 180                 if (pmsg)
 181                         *pmsg = "route-map fromvpn named but not defined";
 182                 return 0;
 183         }
 184         return 1;
 185 }
 186
 187 static inline void vpn_leak_prechange(vpn_policy_direction_t direction,
 188                                       afi_t afi, struct bgp *bgp_vpn,
 189                                       struct bgp *bgp_vrf)
 190 {
 191         /* Detect when default bgp instance is not (yet) defined by config */
 192         if (!bgp_vpn)
 193                 return;
 194
 195         if ((direction == BGP_VPN_POLICY_DIR_FROMVPN) &&
 196                 vpn_leak_from_vpn_active(bgp_vrf, afi, NULL)) {
 197
 198                 vpn_leak_to_vrf_withdraw_all(bgp_vrf, afi);
 199         }
 200         if ((direction == BGP_VPN_POLICY_DIR_TOVPN) &&
 201                 vpn_leak_to_vpn_active(bgp_vrf, afi, NULL)) {
 202
 203                 vpn_leak_from_vrf_withdraw_all(bgp_vpn, bgp_vrf, afi);
 204         }
 205 }
 206
 207 static inline void vpn_leak_postchange(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_to_vrf_update_all(bgp_vrf, bgp_vpn, afi);
 217         if (direction == BGP_VPN_POLICY_DIR_TOVPN) {
 218
 219                 if (bgp_vrf->vpn_policy[afi].tovpn_label !=
 220                         bgp_vrf->vpn_policy[afi]
 221                                .tovpn_zebra_vrf_label_last_sent) {
 222                         vpn_leak_zebra_vrf_label_update(bgp_vrf, afi);
 223                 }
 224
 225                 vpn_leak_from_vrf_update_all(bgp_vpn, bgp_vrf, afi);
 226         }
 227 }
 228
 229 extern void vpn_policy_routemap_event(const char *rmap_name);
 230
 231 extern vrf_id_t get_first_vrf_for_redirect_with_rt(struct ecommunity *eckey);
 232
 233 extern void vpn_leak_postchange_all(void);
 234
 235 #endif /* _QUAGGA_BGP_MPLSVPN_H */