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a4168ebc | 1 | /* BGP EVPN internal definitions |
2 | * Copyright (C) 2017 Cumulus Networks, Inc. | |
3 | * | |
4 | * This file is part of FRR. | |
5 | * | |
6 | * FRR 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 | * FRR 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 | |
17 | * along with FRR; see the file COPYING. If not, write to the Free | |
18 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | * 02111-1307, USA. | |
20 | */ | |
21 | ||
22 | #ifndef _BGP_EVPN_PRIVATE_H | |
23 | #define _BGP_EVPN_PRIVATE_H | |
24 | ||
25 | #include "vxlan.h" | |
26 | #include "zebra.h" | |
27 | ||
28 | #include "bgpd/bgpd.h" | |
29 | #include "bgpd/bgp_ecommunity.h" | |
30 | ||
31 | /* EVPN prefix lengths. */ | |
32 | #define EVPN_TYPE_2_ROUTE_PREFIXLEN 224 | |
33 | #define EVPN_TYPE_3_ROUTE_PREFIXLEN 224 | |
34 | ||
35 | /* EVPN route types. */ | |
36 | typedef enum | |
37 | { | |
38 | BGP_EVPN_AD_ROUTE = 1, /* Ethernet Auto-Discovery (A-D) route */ | |
39 | BGP_EVPN_MAC_IP_ROUTE, /* MAC/IP Advertisement route */ | |
40 | BGP_EVPN_IMET_ROUTE, /* Inclusive Multicast Ethernet Tag route */ | |
41 | BGP_EVPN_ES_ROUTE, /* Ethernet Segment route */ | |
42 | BGP_EVPN_IP_PREFIX_ROUTE, /* IP Prefix route */ | |
43 | } bgp_evpn_route_type; | |
44 | ||
45 | /* | |
46 | * Hash table of EVIs. Right now, the only type of EVI supported is with | |
47 | * VxLAN encapsulation, hence each EVI corresponds to a L2 VNI. | |
48 | * The VNIs are not "created" through BGP but through some other interface | |
49 | * on the system. This table stores VNIs that BGP comes to know as present | |
50 | * on the system (through interaction with zebra) as well as pre-configured | |
51 | * VNIs (which need to be defined in the system to become "live"). | |
52 | */ | |
53 | struct bgpevpn | |
54 | { | |
55 | vni_t vni; | |
56 | u_int32_t flags; | |
57 | #define VNI_FLAG_CFGD 0x1 /* VNI is user configured */ | |
58 | #define VNI_FLAG_LIVE 0x2 /* VNI is "live" */ | |
59 | #define VNI_FLAG_RD_CFGD 0x4 /* RD is user configured. */ | |
60 | #define VNI_FLAG_IMPRT_CFGD 0x8 /* Import RT is user configured */ | |
61 | #define VNI_FLAG_EXPRT_CFGD 0x10 /* Export RT is user configured */ | |
62 | ||
63 | /* Id for deriving the RD automatically for this VNI */ | |
64 | u_int16_t rd_id; | |
65 | ||
66 | /* RD for this VNI. */ | |
67 | struct prefix_rd prd; | |
68 | ||
69 | /* Route type 3 field */ | |
70 | struct in_addr originator_ip; | |
71 | ||
72 | /* Import and Export RTs. */ | |
73 | struct list *import_rtl; | |
74 | struct list *export_rtl; | |
75 | ||
76 | /* Route table for EVPN routes for this VNI. */ | |
77 | struct bgp_table *route_table; | |
78 | ||
79 | QOBJ_FIELDS | |
80 | }; | |
81 | ||
82 | DECLARE_QOBJ_TYPE(bgpevpn) | |
83 | ||
84 | /* Mapping of Import RT to VNIs. | |
85 | * The Import RTs of all VNIs are maintained in a hash table with each | |
86 | * RT linking to all VNIs that will import routes matching this RT. | |
87 | */ | |
88 | struct irt_node | |
89 | { | |
90 | /* RT */ | |
91 | struct ecommunity_val rt; | |
92 | ||
93 | /* List of VNIs importing routes matching this RT. */ | |
94 | struct list *vnis; | |
95 | }; | |
96 | ||
128ea8ab | 97 | #define RT_TYPE_IMPORT 1 |
98 | #define RT_TYPE_EXPORT 2 | |
99 | #define RT_TYPE_BOTH 3 | |
100 | ||
101 | static inline int | |
102 | is_vni_configured (struct bgpevpn *vpn) | |
103 | { | |
104 | return (CHECK_FLAG (vpn->flags, VNI_FLAG_CFGD)); | |
105 | } | |
106 | ||
107 | static inline int | |
108 | is_vni_live (struct bgpevpn *vpn) | |
109 | { | |
110 | return (CHECK_FLAG (vpn->flags, VNI_FLAG_LIVE)); | |
111 | } | |
112 | ||
113 | static inline int | |
114 | is_rd_configured (struct bgpevpn *vpn) | |
115 | { | |
116 | return (CHECK_FLAG (vpn->flags, VNI_FLAG_RD_CFGD)); | |
117 | } | |
118 | ||
119 | static inline int | |
120 | bgp_evpn_rd_matches_existing (struct bgpevpn *vpn, struct prefix_rd *prd) | |
121 | { | |
122 | return(memcmp (&vpn->prd.val, prd->val, ECOMMUNITY_SIZE) == 0); | |
123 | } | |
124 | ||
125 | static inline int | |
126 | is_import_rt_configured (struct bgpevpn *vpn) | |
127 | { | |
128 | return (CHECK_FLAG (vpn->flags, VNI_FLAG_IMPRT_CFGD)); | |
129 | } | |
130 | ||
131 | static inline int | |
132 | is_export_rt_configured (struct bgpevpn *vpn) | |
133 | { | |
134 | return (CHECK_FLAG (vpn->flags, VNI_FLAG_EXPRT_CFGD)); | |
135 | } | |
136 | ||
137 | static inline int | |
138 | is_vni_param_configured (struct bgpevpn *vpn) | |
139 | { | |
140 | return (is_rd_configured (vpn) || | |
141 | is_import_rt_configured (vpn) || | |
142 | is_export_rt_configured (vpn)); | |
143 | } | |
144 | ||
145 | static inline void | |
146 | vni2label (vni_t vni, mpls_label_t *label) | |
147 | { | |
148 | u_char *tag = (u_char *) label; | |
149 | tag[0] = (vni >> 16) & 0xFF; | |
150 | tag[1] = (vni >> 8) & 0xFF; | |
151 | tag[2] = vni & 0xFF; | |
152 | } | |
153 | ||
154 | static inline vni_t | |
155 | label2vni (mpls_label_t *label) | |
156 | { | |
157 | u_char *tag = (u_char *) label; | |
158 | vni_t vni; | |
159 | ||
160 | vni = ((u_int32_t) *tag++ << 16); | |
161 | vni |= (u_int32_t) *tag++ << 8; | |
162 | vni |= (u_int32_t) (*tag & 0xFF); | |
163 | ||
164 | return vni; | |
165 | } | |
166 | ||
167 | static inline void | |
168 | encode_mac_mobility_extcomm (int static_mac, u_int32_t seq, | |
169 | struct ecommunity_val *eval) | |
170 | { | |
171 | memset (eval, 0, sizeof (*eval)); | |
172 | eval->val[0] = ECOMMUNITY_ENCODE_EVPN; | |
173 | eval->val[1] = ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY; | |
174 | if (static_mac) | |
175 | eval->val[2] = ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY_FLAG_STICKY; | |
176 | eval->val[4] = (seq >> 24) & 0xff; | |
177 | eval->val[5] = (seq >> 16) & 0xff; | |
178 | eval->val[6] = (seq >> 8) & 0xff; | |
179 | eval->val[7] = seq & 0xff; | |
180 | } | |
181 | ||
182 | static inline void | |
183 | build_evpn_type2_prefix (struct prefix_evpn *p, struct ethaddr *mac, | |
184 | struct ipaddr *ip) | |
185 | { | |
186 | memset (p, 0, sizeof (struct prefix_evpn)); | |
187 | p->family = AF_ETHERNET; | |
188 | p->prefixlen = EVPN_TYPE_2_ROUTE_PREFIXLEN; | |
189 | p->prefix.route_type = BGP_EVPN_MAC_IP_ROUTE; | |
190 | memcpy(&p->prefix.mac.octet, mac->octet, ETHER_ADDR_LEN); | |
191 | p->prefix.ip.ipa_type = IPADDR_NONE; | |
192 | if (ip) | |
193 | memcpy(&p->prefix.ip, ip, sizeof (*ip)); | |
194 | } | |
195 | ||
196 | static inline void | |
197 | build_evpn_type3_prefix (struct prefix_evpn *p, struct in_addr originator_ip) | |
198 | { | |
199 | memset (p, 0, sizeof (struct prefix_evpn)); | |
200 | p->family = AF_ETHERNET; | |
201 | p->prefixlen = EVPN_TYPE_3_ROUTE_PREFIXLEN; | |
202 | p->prefix.route_type = BGP_EVPN_IMET_ROUTE; | |
203 | p->prefix.ip.ipa_type = IPADDR_V4; | |
204 | p->prefix.ip.ipaddr_v4 = originator_ip; | |
205 | } | |
206 | ||
207 | ||
90e60aa7 | 208 | extern int |
209 | bgp_evpn_handle_export_rt_change (struct bgp *bgp, struct bgpevpn *vpn); | |
210 | extern void | |
211 | bgp_evpn_handle_rd_change (struct bgp *bgp, struct bgpevpn *vpn, int withdraw); | |
212 | extern int | |
213 | bgp_evpn_install_routes (struct bgp *bgp, struct bgpevpn *vpn); | |
214 | extern int | |
215 | bgp_evpn_uninstall_routes (struct bgp *bgp, struct bgpevpn *vpn); | |
128ea8ab | 216 | extern void |
217 | bgp_evpn_map_vni_to_its_rts (struct bgp *bgp, struct bgpevpn *vpn); | |
218 | extern void | |
219 | bgp_evpn_unmap_vni_from_its_rts (struct bgp *bgp, struct bgpevpn *vpn); | |
220 | extern void | |
221 | bgp_evpn_derive_auto_rt_import (struct bgp *bgp, struct bgpevpn *vpn); | |
222 | extern void | |
223 | bgp_evpn_derive_auto_rt_export (struct bgp *bgp, struct bgpevpn *vpn); | |
224 | extern void | |
225 | bgp_evpn_derive_auto_rd (struct bgp *bgp, struct bgpevpn *vpn); | |
226 | extern struct bgpevpn * | |
227 | bgp_evpn_lookup_vni (struct bgp *bgp, vni_t vni); | |
228 | extern struct bgpevpn * | |
229 | bgp_evpn_new (struct bgp *bgp, vni_t vni, struct in_addr originator_ip); | |
230 | extern void | |
231 | bgp_evpn_free (struct bgp *bgp, struct bgpevpn *vpn); | |
a4168ebc | 232 | #endif /* _BGP_EVPN_PRIVATE_H */ |