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
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <linux/if_infiniband.h>
#include <net/ethernet.h>
#include <net/if_arp.h>
#include "dhcp-identifier.h"
#include "netif-util.h"
#include "network-common.h"
#include "siphash24.h"
#include "sparse-endian.h"
#include "string-table.h"
#define HASH_KEY SD_ID128_MAKE(80,11,8c,c2,fe,4a,03,ee,3e,d6,0c,6f,36,39,14,09)
#define APPLICATION_ID SD_ID128_MAKE(a5,0a,d1,12,bf,60,45,77,a2,fb,74,1a,b1,95,5b,03)
#define USEC_2000 ((usec_t) 946684800000000) /* 2000-01-01 00:00:00 UTC */
static const char * const duid_type_table[_DUID_TYPE_MAX] = {
[DUID_TYPE_LLT] = "DUID-LLT",
[DUID_TYPE_EN] = "DUID-EN/Vendor",
[DUID_TYPE_LL] = "DUID-LL",
[DUID_TYPE_UUID] = "UUID",
};
DEFINE_STRING_TABLE_LOOKUP_TO_STRING(duid_type, DUIDType);
int dhcp_identifier_set_duid_llt(
const struct hw_addr_data *hw_addr,
uint16_t arp_type,
usec_t t,
struct duid *ret_duid,
size_t *ret_len) {
uint16_t time_from_2000y;
assert(hw_addr);
assert(ret_duid);
assert(ret_len);
if (hw_addr->length == 0)
return -EOPNOTSUPP;
if (arp_type == ARPHRD_ETHER)
assert_return(hw_addr->length == ETH_ALEN, -EINVAL);
else if (arp_type == ARPHRD_INFINIBAND)
assert_return(hw_addr->length == INFINIBAND_ALEN, -EINVAL);
else
return -EOPNOTSUPP;
if (t < USEC_2000)
time_from_2000y = 0;
else
time_from_2000y = (uint16_t) (((t - USEC_2000) / USEC_PER_SEC) & 0xffffffff);
unaligned_write_be16(&ret_duid->type, DUID_TYPE_LLT);
unaligned_write_be16(&ret_duid->llt.htype, arp_type);
unaligned_write_be32(&ret_duid->llt.time, time_from_2000y);
memcpy(ret_duid->llt.haddr, hw_addr->bytes, hw_addr->length);
*ret_len = offsetof(struct duid, llt.haddr) + hw_addr->length;
return 0;
}
int dhcp_identifier_set_duid_ll(
const struct hw_addr_data *hw_addr,
uint16_t arp_type,
struct duid *ret_duid,
size_t *ret_len) {
assert(hw_addr);
assert(ret_duid);
assert(ret_len);
if (hw_addr->length == 0)
return -EOPNOTSUPP;
if (arp_type == ARPHRD_ETHER)
assert_return(hw_addr->length == ETH_ALEN, -EINVAL);
else if (arp_type == ARPHRD_INFINIBAND)
assert_return(hw_addr->length == INFINIBAND_ALEN, -EINVAL);
else
return -EOPNOTSUPP;
unaligned_write_be16(&ret_duid->type, DUID_TYPE_LL);
unaligned_write_be16(&ret_duid->ll.htype, arp_type);
memcpy(ret_duid->ll.haddr, hw_addr->bytes, hw_addr->length);
*ret_len = offsetof(struct duid, ll.haddr) + hw_addr->length;
return 0;
}
int dhcp_identifier_set_duid_en(struct duid *ret_duid, size_t *ret_len) {
sd_id128_t machine_id;
bool test_mode;
uint64_t hash;
int r;
assert(ret_duid);
assert(ret_len);
test_mode = network_test_mode_enabled();
if (!test_mode) {
r = sd_id128_get_machine(&machine_id);
if (r < 0)
return r;
} else
/* For tests, especially for fuzzers, reproducibility is important.
* Hence, use a static and constant machine ID.
* See 9216fddc5a8ac2742e6cfa7660f95c20ca4f2193. */
machine_id = SD_ID128_MAKE(01, 02, 03, 04, 05, 06, 07, 08, 09, 0a, 0b, 0c, 0d, 0e, 0f, 10);
unaligned_write_be16(&ret_duid->type, DUID_TYPE_EN);
unaligned_write_be32(&ret_duid->en.pen, SYSTEMD_PEN);
/* a bit of snake-oil perhaps, but no need to expose the machine-id
* directly; duid->en.id might not be aligned, so we need to copy */
hash = htole64(siphash24(&machine_id, sizeof(machine_id), HASH_KEY.bytes));
memcpy(ret_duid->en.id, &hash, sizeof(hash));
*ret_len = offsetof(struct duid, en.id) + sizeof(hash);
if (test_mode)
assert_se(memcmp(ret_duid, (const uint8_t[]) { 0x00, 0x02, 0x00, 0x00, 0xab, 0x11, 0x61, 0x77, 0x40, 0xde, 0x13, 0x42, 0xc3, 0xa2 }, *ret_len) == 0);
return 0;
}
int dhcp_identifier_set_duid_uuid(struct duid *ret_duid, size_t *ret_len) {
sd_id128_t machine_id;
int r;
assert(ret_duid);
assert(ret_len);
r = sd_id128_get_machine_app_specific(APPLICATION_ID, &machine_id);
if (r < 0)
return r;
unaligned_write_be16(&ret_duid->type, DUID_TYPE_UUID);
memcpy(&ret_duid->uuid.uuid, &machine_id, sizeof(machine_id));
*ret_len = offsetof(struct duid, uuid.uuid) + sizeof(machine_id);
return 0;
}
int dhcp_identifier_set_duid_raw(
DUIDType duid_type,
const uint8_t *buf,
size_t buf_len,
struct duid *ret_duid,
size_t *ret_len) {
assert(buf || buf_len == 0);
assert(ret_duid);
assert(ret_len);
if (duid_type < 0 || duid_type > UINT16_MAX)
return -EINVAL;
if (buf_len > MAX_DUID_DATA_LEN)
return -EINVAL;
unaligned_write_be16(&ret_duid->type, duid_type);
memcpy_safe(ret_duid->raw.data, buf, buf_len);
*ret_len = offsetof(struct duid, raw.data) + buf_len;
return 0;
}
int dhcp_identifier_set_iaid(
sd_device *dev,
const struct hw_addr_data *hw_addr,
bool legacy_unstable_byteorder,
void *ret) {
const char *name = NULL;
uint32_t id32;
uint64_t id;
assert(hw_addr);
assert(ret);
if (dev)
name = net_get_persistent_name(dev);
if (name)
id = siphash24(name, strlen(name), HASH_KEY.bytes);
else
/* fall back to MAC address if no predictable name available */
id = siphash24(hw_addr->bytes, hw_addr->length, HASH_KEY.bytes);
id32 = (id & 0xffffffff) ^ (id >> 32);
if (legacy_unstable_byteorder)
/* for historical reasons (a bug), the bits were swapped and thus
* the result was endianness dependent. Preserve that behavior. */
id32 = bswap_32(id32);
else
/* the fixed behavior returns a stable byte order. Since LE is expected
* to be more common, swap the bytes on LE to give the same as legacy
* behavior. */
id32 = be32toh(id32);
unaligned_write_ne32(ret, id32);
return 0;
}
|
