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
226
227
228
229
230
231
232
233
234
235
236
|
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright (C) 2014 Tom Gundersen
Copyright (C) 2014 Susant Sahani
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <net/ethernet.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include "macro.h"
#include "lldp.h"
#include "lldp-tlv.h"
#define TEST_LLDP_PORT "em1"
#define TEST_LLDP_TYPE_SYSTEM_NAME "systemd-lldp"
#define TEST_LLDP_TYPE_SYSTEM_DESC "systemd-lldp-desc"
static struct ether_addr mac_addr = {
.ether_addr_octet = {'A', 'B', 'C', '1', '2', '3'}
};
static int lldp_build_tlv_packet(tlv_packet **ret) {
_cleanup_tlv_packet_free_ tlv_packet *m = NULL;
const uint8_t lldp_dst[] = LLDP_MULTICAST_ADDR;
struct ether_header ether = {
.ether_type = htons(ETHERTYPE_LLDP),
};
/* Append ethernet header */
memcpy(ðer.ether_dhost, lldp_dst, ETHER_ADDR_LEN);
memcpy(ðer.ether_shost, &mac_addr, ETHER_ADDR_LEN);
assert_se(tlv_packet_new(&m) >= 0);
assert_se(tlv_packet_append_bytes(m, ðer, sizeof(struct ether_header)) >= 0);
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_CHASSIS_ID) >= 0);
assert_se(tlv_packet_append_u8(m, LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS) >= 0);
assert_se(tlv_packet_append_bytes(m, &mac_addr, ETHER_ADDR_LEN) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
/* port name */
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_PORT_ID) >= 0);
assert_se(tlv_packet_append_u8(m, LLDP_PORT_SUBTYPE_INTERFACE_NAME) >= 0);
assert_se(tlv_packet_append_bytes(m, TEST_LLDP_PORT, strlen(TEST_LLDP_PORT) + 1) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
/* ttl */
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_TTL) >= 0);
assert_se(tlv_packet_append_u16(m, 170) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
/* system name */
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_SYSTEM_NAME) >= 0);
assert_se(tlv_packet_append_bytes(m, TEST_LLDP_TYPE_SYSTEM_NAME,
strlen(TEST_LLDP_TYPE_SYSTEM_NAME)) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
/* system descrition */
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_SYSTEM_DESCRIPTION) >= 0);
assert_se(tlv_packet_append_bytes(m, TEST_LLDP_TYPE_SYSTEM_DESC,
strlen(TEST_LLDP_TYPE_SYSTEM_DESC)) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
/* Mark end of packet */
assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_END) >= 0);
assert_se(lldp_tlv_packet_close_container(m) >= 0);
*ret = m;
m = NULL;
return 0;
}
static int lldp_parse_chassis_tlv(tlv_packet *m, uint8_t *type) {
uint8_t *p, subtype;
uint16_t length;
assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_CHASSIS_ID) >= 0);
assert_se(tlv_packet_read_u8(m, &subtype) >= 0);
switch (subtype) {
case LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS:
*type = LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS;
assert_se(tlv_packet_read_bytes(m, &p, &length) >= 0);
assert_se(memcmp(p, &mac_addr.ether_addr_octet, ETHER_ADDR_LEN) == 0);
break;
default:
assert_not_reached("Unhandled option");
}
assert_se(lldp_tlv_packet_exit_container(m) >= 0);
return 0;
}
static int lldp_parse_port_id_tlv(tlv_packet *m) {
_cleanup_free_ char *p = NULL;
char *str = NULL;
uint16_t length;
uint8_t subtype;
assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_PORT_ID) >= 0);
assert_se(tlv_packet_read_u8(m, &subtype) >= 0);
switch (subtype) {
case LLDP_PORT_SUBTYPE_INTERFACE_NAME:
assert_se(tlv_packet_read_string(m, &str, &length) >= 0);
p = strndup(str, length-1);
assert_se(p);
assert_se(streq(p, TEST_LLDP_PORT) == 1);
break;
default:
assert_not_reached("Unhandled option");
}
assert_se(lldp_tlv_packet_exit_container(m) >= 0);
return 0;
}
static int lldp_parse_system_name_tlv(tlv_packet *m) {
_cleanup_free_ char *p = NULL;
char *str = NULL;
uint16_t length;
assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_SYSTEM_NAME) >= 0);
assert_se(tlv_packet_read_string(m, &str, &length) >= 0);
p = strndup(str, length);
assert_se(p);
assert_se(streq(p, TEST_LLDP_TYPE_SYSTEM_NAME) == 1);
assert_se(lldp_tlv_packet_exit_container(m) >= 0);
return 1;
}
static int lldp_parse_system_desc_tlv(tlv_packet *m) {
_cleanup_free_ char *p = NULL;
char *str = NULL;
uint16_t length;
assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_SYSTEM_DESCRIPTION) >= 0);
assert_se(tlv_packet_read_string(m, &str, &length) >= 0);
p = strndup(str, length);
assert_se(p);
assert_se(streq(p, TEST_LLDP_TYPE_SYSTEM_DESC) == 1);
assert_se(lldp_tlv_packet_exit_container(m) >= 0);
return 0;
}
static int lldp_parse_ttl_tlv(tlv_packet *m) {
uint16_t ttl;
assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_TTL) >= 0);
assert_se(tlv_packet_read_u16(m, &ttl) >= 0);
assert_se(ttl == 170);
assert_se(lldp_tlv_packet_exit_container(m) >= 0);
return 0;
}
static int lldp_parse_tlv_packet(tlv_packet *m, int len) {
uint8_t subtype;
assert_se(tlv_packet_parse_pdu(m, len) >= 0);
assert_se(lldp_parse_chassis_tlv(m, &subtype) >= 0);
assert_se(lldp_parse_port_id_tlv(m) >= 0);
assert_se(lldp_parse_system_name_tlv(m) >= 0);
assert_se(lldp_parse_ttl_tlv(m) >= 0);
assert_se(lldp_parse_system_desc_tlv(m) >= 0);
return 0;
}
int main(int argc, char *argv[]) {
_cleanup_tlv_packet_free_ tlv_packet *tlv = NULL;
/* form a packet */
lldp_build_tlv_packet(&tlv);
/* parse the packet */
tlv_packet_parse_pdu(tlv, tlv->length);
/* verify */
lldp_parse_tlv_packet(tlv, tlv->length);
return 0;
}
|
