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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 | /* Flag if the route is injectable into VPN. This would be either a | |
230 | * non-imported route or a non-VPN imported route. | |
231 | */ | |
232 | static inline bool is_route_injectable_into_vpn(struct bgp_path_info *pi) | |
233 | { | |
234 | struct bgp_path_info *parent_pi; | |
235 | struct bgp_table *table; | |
236 | struct bgp_node *rn; | |
237 | ||
238 | if (pi->sub_type != BGP_ROUTE_IMPORTED || | |
239 | !pi->extra || | |
240 | !pi->extra->parent) | |
241 | return true; | |
242 | ||
243 | parent_pi = (struct bgp_path_info *)pi->extra->parent; | |
244 | rn = parent_pi->net; | |
245 | if (!rn) | |
246 | return true; | |
247 | table = bgp_node_table(rn); | |
248 | if (table && | |
249 | (table->afi == AFI_IP || table->afi == AFI_IP6) && | |
250 | table->safi == SAFI_MPLS_VPN) | |
251 | return false; | |
252 | return true; | |
253 | } | |
254 | ||
255 | /* Flag if the route path's family is VPN. */ | |
256 | static inline bool is_pi_family_vpn(struct bgp_path_info *pi) | |
257 | { | |
258 | return (is_pi_family_matching(pi, AFI_IP, SAFI_MPLS_VPN) || | |
259 | is_pi_family_matching(pi, AFI_IP6, SAFI_MPLS_VPN)); | |
260 | } | |
261 | ||
262 | extern void vpn_policy_routemap_event(const char *rmap_name); | |
263 | ||
264 | extern vrf_id_t get_first_vrf_for_redirect_with_rt(struct ecommunity *eckey); | |
265 | ||
266 | extern void vpn_leak_postchange_all(void); | |
267 | extern void vpn_handle_router_id_update(struct bgp *bgp, bool withdraw, | |
268 | bool is_config); | |
269 | extern int bgp_vpn_leak_unimport(struct bgp *from_bgp, struct vty *vty); | |
270 | extern void bgp_vpn_leak_export(struct bgp *from_bgp); | |
271 | ||
272 | #endif /* _QUAGGA_BGP_MPLSVPN_H */ |