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
|
/***
This file is part of systemd.
Copyright 2012 Kay Sievers <kay@vrfy.org>
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/>.
***/
/*
* prefixes:
* en -- ethernet
* wl -- wlan
* ww -- wwan
*
* types:
* o<index> -- on-board device index
* s<slot>f<function> -- hotplug slot number
* x<MAC> -- MAC address
* p<bus>s<slot>f<function> -- PCI/physical location
*
* example:
* ID_NET_NAME_ONBOARD=eno1
* ID_NET_NAME_SLOT=ens1f0
* ID_NET_NAME_MAC=enxf0def180d479
* ID_NET_NAME_PATH=enp19s0f0
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "udev.h"
/* retrieve on-board index number and label from firmware */
static int dev_pci_onboard(struct udev_device *dev, struct udev_device *parent, const char *prefix, bool test) {
const char *index;
int idx;
const char *label;
char s[16];
int err;
/* ACPI _DSM -- device specific method for naming a PCI or PCI Express device */
index = udev_device_get_sysattr_value(parent, "acpi_index");
/* SMBIOS type 41 -- Onboard Devices Extended Information */
if (!index)
index = udev_device_get_sysattr_value(parent, "index");
if (!index)
return -ENOENT;
idx = strtoul(index, NULL, 0);
if (idx <= 0)
return -EINVAL;
snprintf(s, sizeof(s), "%so%d", prefix, idx);
err = udev_builtin_add_property(dev, test, "ID_NET_NAME_ONBOARD", s);
if (err < 0)
return err;
label = udev_device_get_sysattr_value(parent, "label");
if (label) {
err = udev_builtin_add_property(dev, test, "ID_NET_LABEL_ONBOARD", label);
if (err < 0)
return err;
}
return 0;
}
static int dev_pci_slot(struct udev_device *dev, struct udev_device *parent, const char *prefix, bool test) {
struct udev *udev = udev_device_get_udev(dev);
unsigned int bus;
unsigned int slot;
unsigned int func;
struct udev_device *pci = NULL;
char slots[256];
DIR *dir;
struct dirent *dent;
char str[256];
int hotplug_slot = 0;
int err = 0;
/* compose a name based on the raw kernel's PCI bus, slot numbers */
if (sscanf(udev_device_get_sysname(parent), "0000:%x:%x.%d", &bus, &slot, &func) != 3)
return -ENOENT;
snprintf(str, sizeof(str), "%sp%ds%df%d", prefix, bus, slot, func);
err = udev_builtin_add_property(dev, test, "ID_NET_NAME_PATH", str);
if (err < 0)
return err;
/* ACPI _SUN -- slot user number */
pci = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci");
if (!pci) {
err = -ENOENT;
goto out;
}
snprintf(slots, sizeof(slots), "%s/slots", udev_device_get_syspath(pci));
dir = opendir(slots);
if (!dir) {
err = -errno;
goto out;
}
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
int i;
char *rest;
char *address;
if (dent->d_name[0] == '.')
continue;
i = strtol(dent->d_name, &rest, 10);
if (rest[0] != '\0')
continue;
if (i < 1)
continue;
snprintf(str, sizeof(str), "%s/%s/address", slots, dent->d_name);
if (read_one_line_file(str, &address) >= 0) {
/* match slot address with device by stripping the function */
if (strncmp(address, udev_device_get_sysname(parent), strlen(address)) == 0)
hotplug_slot = i;
free(address);
}
if (hotplug_slot > 0)
break;
}
closedir(dir);
if (hotplug_slot > 0) {
snprintf(str, sizeof(str), "%ss%df%d", prefix, hotplug_slot, func);
err = udev_builtin_add_property(dev, test, "ID_NET_NAME_SLOT", str);
}
out:
udev_device_unref(pci);
return err;
}
static int dev_pci(struct udev_device *dev, const char *prefix, bool test) {
struct udev_device *parent;
/* skip other buses than direct PCI parents */
parent = udev_device_get_parent(dev);
if (!parent || !streq("pci", udev_device_get_subsystem(parent)))
return -ENOENT;
dev_pci_onboard(dev, parent, prefix, test);
dev_pci_slot(dev, parent, prefix, test);
return 0;
}
static int dev_mac(struct udev_device *dev, const char *prefix, bool test) {
const char *s;
unsigned int i;
unsigned int a1, a2, a3, a4, a5, a6;
char str[16];
/* check for NET_ADDR_PERM, skip random MAC addresses */
s = udev_device_get_sysattr_value(dev, "addr_assign_type");
if (!s)
return EXIT_FAILURE;
i = strtoul(s, NULL, 0);
if (i != 0)
return 0;
s = udev_device_get_sysattr_value(dev, "address");
if (!s)
return -ENOENT;
if (sscanf(s, "%x:%x:%x:%x:%x:%x", &a1, &a2, &a3, &a4, &a5, &a6) != 6)
return -EINVAL;
/* skip empty MAC addresses */
if (a1 + a2 + a3 + a4 + a5 + a6 == 0)
return -EINVAL;
/* add IEEE Organizationally Unique Identifier */
snprintf(str, sizeof(str), "OUI:%X%X%X", a1, a2, a3);
udev_builtin_hwdb_lookup(dev, str, test);
snprintf(str, sizeof(str), "%sx%02x%02x%02x%02x%02x%02x", prefix, a1, a2, a3, a4, a5, a6);
return udev_builtin_add_property(dev, test, "ID_NET_NAME_MAC", str);
}
static int builtin_net_id(struct udev_device *dev, int argc, char *argv[], bool test) {
const char *s;
unsigned int i;
const char *devtype;
const char *prefix = "en";
/* handle only ARPHRD_ETHER devices */
s = udev_device_get_sysattr_value(dev, "type");
if (!s)
return EXIT_FAILURE;
i = strtoul(s, NULL, 0);
if (i != 1)
return 0;
devtype = udev_device_get_devtype(dev);
if (devtype) {
if (streq("wlan", devtype))
prefix = "wl";
else if (streq("wwan", devtype))
prefix = "ww";
}
dev_pci(dev, prefix, test);
dev_mac(dev, prefix, test);
return EXIT_SUCCESS;
}
const struct udev_builtin udev_builtin_net_id = {
.name = "net_id",
.cmd = builtin_net_id,
.help = "network device properties",
};
|
