1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/* Ethernet-VPN Packet and vty Processing File
* Copyright (C) 2016 6WIND
*
* This file is part of FRRouting.
*
* FRRouting is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* FRRouting is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "command.h"
#include "filter.h"
#include "prefix.h"
#include "log.h"
#include "memory.h"
#include "stream.h"
#include "bgpd/bgp_attr_evpn.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_table.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_mplsvpn.h"
#include "bgpd/bgp_evpn.h"
int
bgp_nlri_parse_evpn(struct peer *peer, struct attr *attr,
struct bgp_nlri *packet, int withdraw)
{
u_char *pnt;
u_char *lim;
struct prefix p;
struct prefix_rd prd;
struct evpn_addr *p_evpn_p;
struct bgp_route_evpn evpn;
uint8_t route_type, route_length;
u_char *pnt_label;
u_int32_t addpath_id = 0;
/* Check peer status. */
if (peer->status != Established)
return 0;
/* Make prefix_rd */
prd.family = AF_UNSPEC;
prd.prefixlen = 64;
p_evpn_p = &p.u.prefix_evpn;
pnt = packet->nlri;
lim = pnt + packet->length;
while (pnt < lim) {
/* clear evpn structure */
memset(&evpn, 0, sizeof(evpn));
/* Clear prefix structure. */
memset(&p, 0, sizeof(struct prefix));
memset(&evpn.gw_ip, 0, sizeof(union gw_addr));
memset(&evpn.eth_s_id, 0, sizeof(struct eth_segment_id));
/* Fetch Route Type */
route_type = *pnt++;
route_length = *pnt++;
/* simply ignore. goto next route type if any */
if (route_type != EVPN_IP_PREFIX) {
if (pnt + route_length > lim) {
zlog_err
("not enough bytes for New Route Type left in NLRI?");
return -1;
}
pnt += route_length;
continue;
}
/* Fetch RD */
if (pnt + 8 > lim) {
zlog_err("not enough bytes for RD left in NLRI?");
return -1;
}
/* Copy routing distinguisher to rd. */
memcpy(&prd.val, pnt, 8);
pnt += 8;
/* Fetch ESI */
if (pnt + 10 > lim) {
zlog_err("not enough bytes for ESI left in NLRI?");
return -1;
}
memcpy(&evpn.eth_s_id.val, pnt, 10);
pnt += 10;
/* Fetch Ethernet Tag */
if (pnt + 4 > lim) {
zlog_err("not enough bytes for Eth Tag left in NLRI?");
return -1;
}
if (route_type == EVPN_IP_PREFIX) {
p_evpn_p->route_type = route_type;
memcpy(&(p_evpn_p->eth_tag), pnt, 4);
p_evpn_p->eth_tag = ntohl(p_evpn_p->eth_tag);
pnt += 4;
/* Fetch IP prefix length. */
p_evpn_p->ip_prefix_length = *pnt++;
if (p_evpn_p->ip_prefix_length > 128) {
zlog_err("invalid prefixlen %d in EVPN NLRI?",
p.prefixlen);
return -1;
}
/* determine IPv4 or IPv6 prefix */
if (route_length - 4 - 10 - 8 -
3 /* label to be read */ >= 32) {
p_evpn_p->flags = IP_PREFIX_V6;
memcpy(&(p_evpn_p->ip.v6_addr), pnt, 16);
pnt += 16;
memcpy(&evpn.gw_ip.ipv6, pnt, 16);
pnt += 16;
} else {
p_evpn_p->flags = IP_PREFIX_V4;
memcpy(&(p_evpn_p->ip.v4_addr), pnt, 4);
pnt += 4;
memcpy(&evpn.gw_ip.ipv4, pnt, 4);
pnt += 4;
}
p.family = AFI_L2VPN;
if (p_evpn_p->flags == IP_PREFIX_V4)
p.prefixlen =
(u_char) PREFIX_LEN_ROUTE_TYPE_5_IPV4;
else
p.prefixlen = PREFIX_LEN_ROUTE_TYPE_5_IPV6;
p.family = AF_ETHERNET;
}
/* Fetch Label */
if (pnt + 3 > lim) {
zlog_err("not enough bytes for Label left in NLRI?");
return -1;
}
pnt_label = pnt;
pnt += 3;
if (!withdraw) {
bgp_update(peer, &p, addpath_id, attr, AFI_L2VPN,
SAFI_EVPN, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
&prd, pnt_label, 0, &evpn);
} else {
bgp_withdraw(peer, &p, addpath_id, attr, AFI_L2VPN,
SAFI_EVPN, ZEBRA_ROUTE_BGP,
BGP_ROUTE_NORMAL, &prd, pnt_label, &evpn);
}
}
/* Packet length consistency check. */
if (pnt != lim)
return -1;
return 0;
}
void
bgp_packet_mpattr_route_type_5(struct stream *s,
struct prefix *p, struct prefix_rd *prd,
u_char * label, struct attr *attr)
{
int len;
char temp[16];
struct evpn_addr *p_evpn_p;
memset(&temp, 0, 16);
if (p->family != AF_ETHERNET)
return;
p_evpn_p = &(p->u.prefix_evpn);
if (p_evpn_p->flags & IP_PREFIX_V4)
len = 8; /* ipv4 */
else
len = 32; /* ipv6 */
stream_putc(s, EVPN_IP_PREFIX);
stream_putc(s,
8 /* RD */ + 10 /* ESI */ + 4 /* EthTag */ + 1 + len +
3 /* label */ );
stream_put(s, prd->val, 8);
if (attr && attr->extra)
stream_put(s, &(attr->extra->evpn_overlay.eth_s_id), 10);
else
stream_put(s, &temp, 10);
stream_putl(s, p_evpn_p->eth_tag);
stream_putc(s, p_evpn_p->ip_prefix_length);
if (p_evpn_p->flags & IP_PREFIX_V4)
stream_put_ipv4(s, p_evpn_p->ip.v4_addr.s_addr);
else
stream_put(s, &p_evpn_p->ip.v6_addr, 16);
if (attr && attr->extra) {
if (p_evpn_p->flags & IP_PREFIX_V4)
stream_put_ipv4(s,
attr->extra->evpn_overlay.gw_ip.ipv4.
s_addr);
else
stream_put(s, &(attr->extra->evpn_overlay.gw_ip.ipv6),
16);
} else {
if (p_evpn_p->flags & IP_PREFIX_V4)
stream_put_ipv4(s, 0);
else
stream_put(s, &temp, 16);
}
if (label)
stream_put(s, label, 3);
else
stream_put3(s, 0);
return;
}
|
