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212f5cbc | 1 | /* Ethernet-VPN Attribute handling file |
896014f4 DL |
2 | * Copyright (C) 2016 6WIND |
3 | * | |
4 | * This file is part of FRRouting. | |
5 | * | |
6 | * FRRouting 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 | * FRRouting 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 | */ | |
212f5cbc PG |
20 | |
21 | #include <zebra.h> | |
22 | ||
23 | #include "command.h" | |
7ef5a232 | 24 | #include "filter.h" |
212f5cbc PG |
25 | #include "prefix.h" |
26 | #include "log.h" | |
27 | #include "memory.h" | |
28 | #include "stream.h" | |
74e2bd89 | 29 | #include "vxlan.h" |
212f5cbc | 30 | |
dfa42ea3 PG |
31 | #include "bgpd/bgpd.h" |
32 | #include "bgpd/bgp_attr.h" | |
33 | #include "bgpd/bgp_route.h" | |
212f5cbc | 34 | #include "bgpd/bgp_attr_evpn.h" |
dfa42ea3 | 35 | #include "bgpd/bgp_ecommunity.h" |
3da6fcd5 | 36 | #include "bgpd/bgp_evpn.h" |
128ea8ab | 37 | #include "bgpd/bgp_evpn_private.h" |
dfa42ea3 | 38 | |
761cc919 IS |
39 | bool bgp_route_evpn_same(const struct bgp_route_evpn *e1, |
40 | const struct bgp_route_evpn *e2) | |
41 | { | |
42 | return (e1->type == e2->type && | |
43 | !memcmp(&(e1->eth_s_id), &(e2->eth_s_id), sizeof(esi_t)) && | |
44 | !ipaddr_cmp(&(e1->gw_ip), &(e2->gw_ip))); | |
45 | } | |
46 | ||
31689a53 | 47 | void bgp_add_routermac_ecom(struct attr *attr, struct ethaddr *routermac) |
dfa42ea3 | 48 | { |
d62a17ae | 49 | struct ecommunity_val routermac_ecom; |
b53e67a3 | 50 | struct ecommunity *ecomm = bgp_attr_get_ecommunity(attr); |
d62a17ae | 51 | |
52 | memset(&routermac_ecom, 0, sizeof(struct ecommunity_val)); | |
53 | routermac_ecom.val[0] = ECOMMUNITY_ENCODE_EVPN; | |
54 | routermac_ecom.val[1] = ECOMMUNITY_EVPN_SUBTYPE_ROUTERMAC; | |
28328ea9 | 55 | memcpy(&routermac_ecom.val[2], routermac->octet, ETH_ALEN); |
cfe4dce9 | 56 | if (!ecomm) { |
b53e67a3 | 57 | bgp_attr_set_ecommunity(attr, ecommunity_new()); |
cfe4dce9 IR |
58 | ecomm = bgp_attr_get_ecommunity(attr); |
59 | } | |
b53e67a3 DA |
60 | ecommunity_add_val(ecomm, &routermac_ecom, false, false); |
61 | ecommunity_str(ecomm); | |
dfa42ea3 | 62 | } |
212f5cbc | 63 | |
212f5cbc PG |
64 | /* converts to an esi |
65 | * returns 1 on success, 0 otherwise | |
66 | * format accepted: AA:BB:CC:DD:EE:FF:GG:HH:II:JJ | |
67 | * if id is null, check only is done | |
68 | */ | |
0a50c248 | 69 | bool str2esi(const char *str, esi_t *id) |
212f5cbc | 70 | { |
0a50c248 | 71 | unsigned int a[ESI_BYTES]; |
d62a17ae | 72 | int i; |
73 | ||
74 | if (!str) | |
3dc339cd | 75 | return false; |
d62a17ae | 76 | if (sscanf(str, "%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x", a + 0, a + 1, |
77 | a + 2, a + 3, a + 4, a + 5, a + 6, a + 7, a + 8, a + 9) | |
0a50c248 | 78 | != ESI_BYTES) { |
d62a17ae | 79 | /* error in incoming str length */ |
3dc339cd | 80 | return false; |
d62a17ae | 81 | } |
82 | /* valid mac address */ | |
83 | if (!id) | |
3dc339cd | 84 | return true; |
0a50c248 | 85 | for (i = 0; i < ESI_BYTES; ++i) |
d62a17ae | 86 | id->val[i] = a[i] & 0xff; |
3dc339cd | 87 | return true; |
212f5cbc PG |
88 | } |
89 | ||
212f5cbc PG |
90 | char *ecom_mac2str(char *ecom_mac) |
91 | { | |
d62a17ae | 92 | char *en; |
212f5cbc | 93 | |
d62a17ae | 94 | en = ecom_mac; |
95 | en += 2; | |
128ea8ab | 96 | |
d62a17ae | 97 | return prefix_mac2str((struct ethaddr *)en, NULL, 0); |
128ea8ab | 98 | } |
99 | ||
bc59a672 | 100 | /* Fetch router-mac from extended community */ |
eee353c5 | 101 | bool bgp_attr_rmac(struct attr *attr, struct ethaddr *rmac) |
bc59a672 | 102 | { |
f6e07e1b | 103 | uint32_t i = 0; |
bc59a672 MK |
104 | struct ecommunity *ecom; |
105 | ||
b53e67a3 | 106 | ecom = bgp_attr_get_ecommunity(attr); |
bc59a672 | 107 | if (!ecom || !ecom->size) |
eee353c5 | 108 | return false; |
bc59a672 MK |
109 | |
110 | /* If there is a router mac extended community, set RMAC in attr */ | |
111 | for (i = 0; i < ecom->size; i++) { | |
d7c0a89a QY |
112 | uint8_t *pnt = NULL; |
113 | uint8_t type = 0; | |
114 | uint8_t sub_type = 0; | |
bc59a672 MK |
115 | |
116 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
117 | type = *pnt++; | |
118 | sub_type = *pnt++; | |
119 | ||
996c9314 LB |
120 | if (!(type == ECOMMUNITY_ENCODE_EVPN |
121 | && sub_type == ECOMMUNITY_EVPN_SUBTYPE_ROUTERMAC)) | |
bc59a672 MK |
122 | continue; |
123 | ||
124 | memcpy(rmac, pnt, ETH_ALEN); | |
eee353c5 | 125 | return true; |
bc59a672 | 126 | } |
eee353c5 | 127 | return false; |
bc59a672 MK |
128 | } |
129 | ||
ead40654 MK |
130 | /* |
131 | * return true if attr contains default gw extended community | |
132 | */ | |
133 | uint8_t bgp_attr_default_gw(struct attr *attr) | |
134 | { | |
996c9314 | 135 | struct ecommunity *ecom; |
f6e07e1b | 136 | uint32_t i; |
ead40654 | 137 | |
b53e67a3 | 138 | ecom = bgp_attr_get_ecommunity(attr); |
ead40654 MK |
139 | if (!ecom || !ecom->size) |
140 | return 0; | |
141 | ||
142 | /* If there is a default gw extendd community return true otherwise | |
143 | * return 0 */ | |
144 | for (i = 0; i < ecom->size; i++) { | |
d7c0a89a QY |
145 | uint8_t *pnt; |
146 | uint8_t type, sub_type; | |
ead40654 MK |
147 | |
148 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
149 | type = *pnt++; | |
150 | sub_type = *pnt++; | |
151 | ||
152 | if ((type == ECOMMUNITY_ENCODE_OPAQUE | |
996c9314 | 153 | && sub_type == ECOMMUNITY_EVPN_SUBTYPE_DEF_GW)) |
ead40654 MK |
154 | return 1; |
155 | } | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
74e2bd89 AK |
160 | /* |
161 | * Fetch and return the DF preference and algorithm from | |
162 | * DF election extended community, if present, else 0. | |
163 | */ | |
164 | uint16_t bgp_attr_df_pref_from_ec(struct attr *attr, uint8_t *alg) | |
165 | { | |
166 | struct ecommunity *ecom; | |
f6e07e1b | 167 | uint32_t i; |
74e2bd89 AK |
168 | uint16_t df_pref = 0; |
169 | ||
170 | *alg = EVPN_MH_DF_ALG_SERVICE_CARVING; | |
b53e67a3 | 171 | ecom = bgp_attr_get_ecommunity(attr); |
74e2bd89 AK |
172 | if (!ecom || !ecom->size) |
173 | return 0; | |
174 | ||
175 | for (i = 0; i < ecom->size; i++) { | |
176 | uint8_t *pnt; | |
177 | uint8_t type, sub_type; | |
178 | ||
179 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
180 | type = *pnt++; | |
181 | sub_type = *pnt++; | |
182 | if (!(type == ECOMMUNITY_ENCODE_EVPN | |
183 | && sub_type == ECOMMUNITY_EVPN_SUBTYPE_DF_ELECTION)) | |
184 | continue; | |
185 | ||
186 | *alg = (*pnt++) & ECOMMUNITY_EVPN_SUBTYPE_DF_ALG_BITS; | |
187 | ||
188 | pnt += 3; | |
189 | pnt = ptr_get_be16(pnt, &df_pref); | |
190 | (void)pnt; /* consume value */ | |
191 | break; | |
192 | } | |
193 | ||
194 | return df_pref; | |
195 | } | |
196 | ||
128ea8ab | 197 | /* |
198 | * Fetch and return the sequence number from MAC Mobility extended | |
199 | * community, if present, else 0. | |
200 | */ | |
d7c0a89a | 201 | uint32_t bgp_attr_mac_mobility_seqnum(struct attr *attr, uint8_t *sticky) |
128ea8ab | 202 | { |
d62a17ae | 203 | struct ecommunity *ecom; |
f6e07e1b | 204 | uint32_t i; |
d7c0a89a | 205 | uint8_t flags = 0; |
d62a17ae | 206 | |
b53e67a3 | 207 | ecom = bgp_attr_get_ecommunity(attr); |
d62a17ae | 208 | if (!ecom || !ecom->size) |
209 | return 0; | |
210 | ||
211 | /* If there is a MAC Mobility extended community, return its | |
212 | * sequence number. | |
213 | * TODO: RFC is silent on handling of multiple MAC mobility extended | |
214 | * communities for the same route. We will bail out upon the first | |
215 | * one. | |
216 | */ | |
217 | for (i = 0; i < ecom->size; i++) { | |
1be1693e | 218 | const uint8_t *pnt; |
d7c0a89a QY |
219 | uint8_t type, sub_type; |
220 | uint32_t seq_num; | |
d62a17ae | 221 | |
222 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
223 | type = *pnt++; | |
224 | sub_type = *pnt++; | |
225 | if (!(type == ECOMMUNITY_ENCODE_EVPN | |
226 | && sub_type == ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY)) | |
227 | continue; | |
228 | flags = *pnt++; | |
229 | ||
230 | if (flags & ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY_FLAG_STICKY) | |
231 | *sticky = 1; | |
232 | else | |
233 | *sticky = 0; | |
234 | ||
235 | pnt++; | |
937652c6 DL |
236 | pnt = ptr_get_be32(pnt, &seq_num); |
237 | (void)pnt; /* consume value */ | |
d62a17ae | 238 | return seq_num; |
239 | } | |
240 | ||
241 | return 0; | |
212f5cbc | 242 | } |
3da6fcd5 | 243 | |
68e33151 CS |
244 | /* |
245 | * return true if attr contains router flag extended community | |
246 | */ | |
7904e9fd AK |
247 | void bgp_attr_evpn_na_flag(struct attr *attr, |
248 | uint8_t *router_flag, bool *proxy) | |
68e33151 CS |
249 | { |
250 | struct ecommunity *ecom; | |
f6e07e1b | 251 | uint32_t i; |
68e33151 CS |
252 | uint8_t val; |
253 | ||
b53e67a3 | 254 | ecom = bgp_attr_get_ecommunity(attr); |
68e33151 CS |
255 | if (!ecom || !ecom->size) |
256 | return; | |
257 | ||
258 | /* If there is a evpn na extendd community set router_flag */ | |
259 | for (i = 0; i < ecom->size; i++) { | |
260 | uint8_t *pnt; | |
261 | uint8_t type, sub_type; | |
262 | ||
263 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
264 | type = *pnt++; | |
265 | sub_type = *pnt++; | |
266 | ||
267 | if (type == ECOMMUNITY_ENCODE_EVPN && | |
268 | sub_type == ECOMMUNITY_EVPN_SUBTYPE_ND) { | |
269 | val = *pnt++; | |
7904e9fd AK |
270 | |
271 | if (val & ECOMMUNITY_EVPN_SUBTYPE_ND_ROUTER_FLAG) | |
68e33151 | 272 | *router_flag = 1; |
7904e9fd AK |
273 | |
274 | if (val & ECOMMUNITY_EVPN_SUBTYPE_PROXY_FLAG) | |
275 | *proxy = true; | |
276 | ||
277 | break; | |
68e33151 CS |
278 | } |
279 | } | |
280 | } | |
281 | ||
3da6fcd5 | 282 | /* dst prefix must be AF_INET or AF_INET6 prefix, to forge EVPN prefix */ |
d62a17ae | 283 | extern int bgp_build_evpn_prefix(int evpn_type, uint32_t eth_tag, |
284 | struct prefix *dst) | |
3da6fcd5 | 285 | { |
d62a17ae | 286 | struct evpn_addr *p_evpn_p; |
287 | struct prefix p2; | |
288 | struct prefix *src = &p2; | |
289 | ||
290 | if (!dst || dst->family == 0) | |
291 | return -1; | |
292 | /* store initial prefix in src */ | |
293 | prefix_copy(src, dst); | |
294 | memset(dst, 0, sizeof(struct prefix)); | |
295 | p_evpn_p = &(dst->u.prefix_evpn); | |
b03b8898 | 296 | dst->family = AF_EVPN; |
d62a17ae | 297 | p_evpn_p->route_type = evpn_type; |
298 | if (evpn_type == BGP_EVPN_IP_PREFIX_ROUTE) { | |
3714a385 | 299 | p_evpn_p->prefix_addr.eth_tag = eth_tag; |
300 | p_evpn_p->prefix_addr.ip_prefix_length = p2.prefixlen; | |
d62a17ae | 301 | if (src->family == AF_INET) { |
3714a385 | 302 | SET_IPADDR_V4(&p_evpn_p->prefix_addr.ip); |
303 | memcpy(&p_evpn_p->prefix_addr.ip.ipaddr_v4, | |
304 | &src->u.prefix4, | |
d62a17ae | 305 | sizeof(struct in_addr)); |
61be6e94 | 306 | dst->prefixlen = (uint16_t)PREFIX_LEN_ROUTE_TYPE_5_IPV4; |
d62a17ae | 307 | } else { |
3714a385 | 308 | SET_IPADDR_V6(&p_evpn_p->prefix_addr.ip); |
309 | memcpy(&p_evpn_p->prefix_addr.ip.ipaddr_v6, | |
310 | &src->u.prefix6, | |
d62a17ae | 311 | sizeof(struct in6_addr)); |
61be6e94 | 312 | dst->prefixlen = (uint16_t)PREFIX_LEN_ROUTE_TYPE_5_IPV6; |
d62a17ae | 313 | } |
314 | } else | |
315 | return -1; | |
316 | return 0; | |
3da6fcd5 | 317 | } |