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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 | |
31689a53 | 39 | void bgp_add_routermac_ecom(struct attr *attr, struct ethaddr *routermac) |
dfa42ea3 | 40 | { |
d62a17ae | 41 | struct ecommunity_val routermac_ecom; |
42 | ||
43 | memset(&routermac_ecom, 0, sizeof(struct ecommunity_val)); | |
44 | routermac_ecom.val[0] = ECOMMUNITY_ENCODE_EVPN; | |
45 | routermac_ecom.val[1] = ECOMMUNITY_EVPN_SUBTYPE_ROUTERMAC; | |
28328ea9 | 46 | memcpy(&routermac_ecom.val[2], routermac->octet, ETH_ALEN); |
d62a17ae | 47 | if (!attr->ecommunity) |
48 | attr->ecommunity = ecommunity_new(); | |
1207a5bc | 49 | ecommunity_add_val(attr->ecommunity, &routermac_ecom, false, false); |
d62a17ae | 50 | ecommunity_str(attr->ecommunity); |
dfa42ea3 | 51 | } |
212f5cbc | 52 | |
212f5cbc PG |
53 | /* converts to an esi |
54 | * returns 1 on success, 0 otherwise | |
55 | * format accepted: AA:BB:CC:DD:EE:FF:GG:HH:II:JJ | |
56 | * if id is null, check only is done | |
57 | */ | |
0a50c248 | 58 | bool str2esi(const char *str, esi_t *id) |
212f5cbc | 59 | { |
0a50c248 | 60 | unsigned int a[ESI_BYTES]; |
d62a17ae | 61 | int i; |
62 | ||
63 | if (!str) | |
3dc339cd | 64 | return false; |
d62a17ae | 65 | if (sscanf(str, "%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x", a + 0, a + 1, |
66 | a + 2, a + 3, a + 4, a + 5, a + 6, a + 7, a + 8, a + 9) | |
0a50c248 | 67 | != ESI_BYTES) { |
d62a17ae | 68 | /* error in incoming str length */ |
3dc339cd | 69 | return false; |
d62a17ae | 70 | } |
71 | /* valid mac address */ | |
72 | if (!id) | |
3dc339cd | 73 | return true; |
0a50c248 | 74 | for (i = 0; i < ESI_BYTES; ++i) |
d62a17ae | 75 | id->val[i] = a[i] & 0xff; |
3dc339cd | 76 | return true; |
212f5cbc PG |
77 | } |
78 | ||
212f5cbc PG |
79 | char *ecom_mac2str(char *ecom_mac) |
80 | { | |
d62a17ae | 81 | char *en; |
212f5cbc | 82 | |
d62a17ae | 83 | en = ecom_mac; |
84 | en += 2; | |
128ea8ab | 85 | |
d62a17ae | 86 | return prefix_mac2str((struct ethaddr *)en, NULL, 0); |
128ea8ab | 87 | } |
88 | ||
bc59a672 | 89 | /* Fetch router-mac from extended community */ |
eee353c5 | 90 | bool bgp_attr_rmac(struct attr *attr, struct ethaddr *rmac) |
bc59a672 MK |
91 | { |
92 | int i = 0; | |
93 | struct ecommunity *ecom; | |
94 | ||
95 | ecom = attr->ecommunity; | |
96 | if (!ecom || !ecom->size) | |
eee353c5 | 97 | return false; |
bc59a672 MK |
98 | |
99 | /* If there is a router mac extended community, set RMAC in attr */ | |
100 | for (i = 0; i < ecom->size; i++) { | |
d7c0a89a QY |
101 | uint8_t *pnt = NULL; |
102 | uint8_t type = 0; | |
103 | uint8_t sub_type = 0; | |
bc59a672 MK |
104 | |
105 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
106 | type = *pnt++; | |
107 | sub_type = *pnt++; | |
108 | ||
996c9314 LB |
109 | if (!(type == ECOMMUNITY_ENCODE_EVPN |
110 | && sub_type == ECOMMUNITY_EVPN_SUBTYPE_ROUTERMAC)) | |
bc59a672 MK |
111 | continue; |
112 | ||
113 | memcpy(rmac, pnt, ETH_ALEN); | |
eee353c5 | 114 | return true; |
bc59a672 | 115 | } |
eee353c5 | 116 | return false; |
bc59a672 MK |
117 | } |
118 | ||
ead40654 MK |
119 | /* |
120 | * return true if attr contains default gw extended community | |
121 | */ | |
122 | uint8_t bgp_attr_default_gw(struct attr *attr) | |
123 | { | |
996c9314 LB |
124 | struct ecommunity *ecom; |
125 | int i; | |
ead40654 MK |
126 | |
127 | ecom = attr->ecommunity; | |
128 | if (!ecom || !ecom->size) | |
129 | return 0; | |
130 | ||
131 | /* If there is a default gw extendd community return true otherwise | |
132 | * return 0 */ | |
133 | for (i = 0; i < ecom->size; i++) { | |
d7c0a89a QY |
134 | uint8_t *pnt; |
135 | uint8_t type, sub_type; | |
ead40654 MK |
136 | |
137 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
138 | type = *pnt++; | |
139 | sub_type = *pnt++; | |
140 | ||
141 | if ((type == ECOMMUNITY_ENCODE_OPAQUE | |
996c9314 | 142 | && sub_type == ECOMMUNITY_EVPN_SUBTYPE_DEF_GW)) |
ead40654 MK |
143 | return 1; |
144 | } | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
74e2bd89 AK |
149 | /* |
150 | * Fetch and return the DF preference and algorithm from | |
151 | * DF election extended community, if present, else 0. | |
152 | */ | |
153 | uint16_t bgp_attr_df_pref_from_ec(struct attr *attr, uint8_t *alg) | |
154 | { | |
155 | struct ecommunity *ecom; | |
156 | int i; | |
157 | uint16_t df_pref = 0; | |
158 | ||
159 | *alg = EVPN_MH_DF_ALG_SERVICE_CARVING; | |
160 | ecom = attr->ecommunity; | |
161 | if (!ecom || !ecom->size) | |
162 | return 0; | |
163 | ||
164 | for (i = 0; i < ecom->size; i++) { | |
165 | uint8_t *pnt; | |
166 | uint8_t type, sub_type; | |
167 | ||
168 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
169 | type = *pnt++; | |
170 | sub_type = *pnt++; | |
171 | if (!(type == ECOMMUNITY_ENCODE_EVPN | |
172 | && sub_type == ECOMMUNITY_EVPN_SUBTYPE_DF_ELECTION)) | |
173 | continue; | |
174 | ||
175 | *alg = (*pnt++) & ECOMMUNITY_EVPN_SUBTYPE_DF_ALG_BITS; | |
176 | ||
177 | pnt += 3; | |
178 | pnt = ptr_get_be16(pnt, &df_pref); | |
179 | (void)pnt; /* consume value */ | |
180 | break; | |
181 | } | |
182 | ||
183 | return df_pref; | |
184 | } | |
185 | ||
128ea8ab | 186 | /* |
187 | * Fetch and return the sequence number from MAC Mobility extended | |
188 | * community, if present, else 0. | |
189 | */ | |
d7c0a89a | 190 | uint32_t bgp_attr_mac_mobility_seqnum(struct attr *attr, uint8_t *sticky) |
128ea8ab | 191 | { |
d62a17ae | 192 | struct ecommunity *ecom; |
193 | int i; | |
d7c0a89a | 194 | uint8_t flags = 0; |
d62a17ae | 195 | |
196 | ecom = attr->ecommunity; | |
197 | if (!ecom || !ecom->size) | |
198 | return 0; | |
199 | ||
200 | /* If there is a MAC Mobility extended community, return its | |
201 | * sequence number. | |
202 | * TODO: RFC is silent on handling of multiple MAC mobility extended | |
203 | * communities for the same route. We will bail out upon the first | |
204 | * one. | |
205 | */ | |
206 | for (i = 0; i < ecom->size; i++) { | |
1be1693e | 207 | const uint8_t *pnt; |
d7c0a89a QY |
208 | uint8_t type, sub_type; |
209 | uint32_t seq_num; | |
d62a17ae | 210 | |
211 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
212 | type = *pnt++; | |
213 | sub_type = *pnt++; | |
214 | if (!(type == ECOMMUNITY_ENCODE_EVPN | |
215 | && sub_type == ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY)) | |
216 | continue; | |
217 | flags = *pnt++; | |
218 | ||
219 | if (flags & ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY_FLAG_STICKY) | |
220 | *sticky = 1; | |
221 | else | |
222 | *sticky = 0; | |
223 | ||
224 | pnt++; | |
937652c6 DL |
225 | pnt = ptr_get_be32(pnt, &seq_num); |
226 | (void)pnt; /* consume value */ | |
d62a17ae | 227 | return seq_num; |
228 | } | |
229 | ||
230 | return 0; | |
212f5cbc | 231 | } |
3da6fcd5 | 232 | |
68e33151 CS |
233 | /* |
234 | * return true if attr contains router flag extended community | |
235 | */ | |
7904e9fd AK |
236 | void bgp_attr_evpn_na_flag(struct attr *attr, |
237 | uint8_t *router_flag, bool *proxy) | |
68e33151 CS |
238 | { |
239 | struct ecommunity *ecom; | |
240 | int i; | |
241 | uint8_t val; | |
242 | ||
243 | ecom = attr->ecommunity; | |
244 | if (!ecom || !ecom->size) | |
245 | return; | |
246 | ||
247 | /* If there is a evpn na extendd community set router_flag */ | |
248 | for (i = 0; i < ecom->size; i++) { | |
249 | uint8_t *pnt; | |
250 | uint8_t type, sub_type; | |
251 | ||
252 | pnt = (ecom->val + (i * ECOMMUNITY_SIZE)); | |
253 | type = *pnt++; | |
254 | sub_type = *pnt++; | |
255 | ||
256 | if (type == ECOMMUNITY_ENCODE_EVPN && | |
257 | sub_type == ECOMMUNITY_EVPN_SUBTYPE_ND) { | |
258 | val = *pnt++; | |
7904e9fd AK |
259 | |
260 | if (val & ECOMMUNITY_EVPN_SUBTYPE_ND_ROUTER_FLAG) | |
68e33151 | 261 | *router_flag = 1; |
7904e9fd AK |
262 | |
263 | if (val & ECOMMUNITY_EVPN_SUBTYPE_PROXY_FLAG) | |
264 | *proxy = true; | |
265 | ||
266 | break; | |
68e33151 CS |
267 | } |
268 | } | |
269 | } | |
270 | ||
3da6fcd5 | 271 | /* dst prefix must be AF_INET or AF_INET6 prefix, to forge EVPN prefix */ |
d62a17ae | 272 | extern int bgp_build_evpn_prefix(int evpn_type, uint32_t eth_tag, |
273 | struct prefix *dst) | |
3da6fcd5 | 274 | { |
d62a17ae | 275 | struct evpn_addr *p_evpn_p; |
276 | struct prefix p2; | |
277 | struct prefix *src = &p2; | |
278 | ||
279 | if (!dst || dst->family == 0) | |
280 | return -1; | |
281 | /* store initial prefix in src */ | |
282 | prefix_copy(src, dst); | |
283 | memset(dst, 0, sizeof(struct prefix)); | |
284 | p_evpn_p = &(dst->u.prefix_evpn); | |
b03b8898 | 285 | dst->family = AF_EVPN; |
d62a17ae | 286 | p_evpn_p->route_type = evpn_type; |
287 | if (evpn_type == BGP_EVPN_IP_PREFIX_ROUTE) { | |
3714a385 | 288 | p_evpn_p->prefix_addr.eth_tag = eth_tag; |
289 | p_evpn_p->prefix_addr.ip_prefix_length = p2.prefixlen; | |
d62a17ae | 290 | if (src->family == AF_INET) { |
3714a385 | 291 | SET_IPADDR_V4(&p_evpn_p->prefix_addr.ip); |
292 | memcpy(&p_evpn_p->prefix_addr.ip.ipaddr_v4, | |
293 | &src->u.prefix4, | |
d62a17ae | 294 | sizeof(struct in_addr)); |
61be6e94 | 295 | dst->prefixlen = (uint16_t)PREFIX_LEN_ROUTE_TYPE_5_IPV4; |
d62a17ae | 296 | } else { |
3714a385 | 297 | SET_IPADDR_V6(&p_evpn_p->prefix_addr.ip); |
298 | memcpy(&p_evpn_p->prefix_addr.ip.ipaddr_v6, | |
299 | &src->u.prefix6, | |
d62a17ae | 300 | sizeof(struct in6_addr)); |
61be6e94 | 301 | dst->prefixlen = (uint16_t)PREFIX_LEN_ROUTE_TYPE_5_IPV6; |
d62a17ae | 302 | } |
303 | } else | |
304 | return -1; | |
305 | return 0; | |
3da6fcd5 | 306 | } |
c6ec0c74 KA |
307 | |
308 | extern bool is_zero_gw_ip(const union gw_addr *gw_ip, const afi_t afi) | |
309 | { | |
310 | if (afi == AF_INET6 && IN6_IS_ADDR_UNSPECIFIED(&gw_ip->ipv6)) | |
311 | return true; | |
312 | ||
313 | if (afi == AF_INET && gw_ip->ipv4.s_addr == INADDR_ANY) | |
314 | return true; | |
315 | ||
316 | return false; | |
317 | } |