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
|
#!/bin/sh -e
# This script is run to create persistent network device naming rules
# based on properties of the device.
# If the interface needs to be renamed, INTERFACE_NEW=<name> will be printed
# on stdout to allow udev to IMPORT it.
# variables used to communicate:
# MATCHADDR MAC address used for the match
# MATCHID bus_id used for the match
# MATCHDEVID dev_id used for the match
# MATCHDRV driver name used for the match
# MATCHIFTYPE interface type match
# COMMENT comment to add to the generated rule
# INTERFACE_NAME requested name supplied by external tool
# INTERFACE_NEW new interface name returned by rule writer
# Copyright (C) 2006 Marco d'Itri <md@Linux.IT>
# Copyright (C) 2007 Kay Sievers <kay.sievers@vrfy.org>
#
# This program 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 of the License, or
# (at your option) any later version.
#
# This program 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. If not, see <http://www.gnu.org/licenses/>.
# debug, if UDEV_LOG=<debug>
if [ -n "$UDEV_LOG" ]; then
if [ "$UDEV_LOG" -ge 7 ]; then
set -x
fi
fi
RULES_FILE='/etc/udev/rules.d/70-persistent-net.rules'
. /lib/udev/rule_generator.functions
interface_name_taken() {
local value="$(find_all_rules 'NAME=' $INTERFACE)"
if [ "$value" ]; then
return 0
else
return 1
fi
}
find_next_available() {
raw_find_next_available "$(find_all_rules 'NAME=' "$1")"
}
write_rule() {
local match="$1"
local name="$2"
local comment="$3"
{
if [ "$PRINT_HEADER" ]; then
PRINT_HEADER=
echo "# This file was automatically generated by the $0"
echo "# program, run by the persistent-net-generator.rules rules file."
echo "#"
echo "# You can modify it, as long as you keep each rule on a single"
echo "# line, and change only the value of the NAME= key."
fi
echo ""
[ "$comment" ] && echo "# $comment"
echo "SUBSYSTEM==\"net\", ACTION==\"add\"$match, NAME=\"$name\""
} >> $RULES_FILE
}
if [ -z "$INTERFACE" ]; then
echo "missing \$INTERFACE" >&2
exit 1
fi
# Prevent concurrent processes from modifying the file at the same time.
lock_rules_file
# Check if the rules file is writeable.
choose_rules_file
# the DRIVERS key is needed to not match bridges and VLAN sub-interfaces
if [ "$MATCHADDR" ]; then
match="$match, DRIVERS==\"?*\", ATTR{address}==\"$MATCHADDR\""
fi
if [ "$MATCHDRV" ]; then
match="$match, DRIVERS==\"$MATCHDRV\""
fi
if [ "$MATCHDEVID" ]; then
match="$match, ATTR{dev_id}==\"$MATCHDEVID\""
fi
if [ "$MATCHID" ]; then
match="$match, KERNELS==\"$MATCHID\""
fi
if [ "$MATCHIFTYPE" ]; then
match="$match, ATTR{type}==\"$MATCHIFTYPE\""
fi
if [ -z "$match" ]; then
echo "missing valid match" >&2
unlock_rules_file
exit 1
fi
basename=${INTERFACE%%[0-9]*}
if [ "$INTERFACE_NAME" ]; then
# external tools may request a custom name
COMMENT="$COMMENT (custom name provided by external tool)"
if [ "$INTERFACE_NAME" != "$INTERFACE" ]; then
INTERFACE=$INTERFACE_NAME;
echo "INTERFACE_NEW=$INTERFACE"
fi
else
# if a rule using the current name already exists, find a new name
if interface_name_taken; then
INTERFACE="$basename$(find_next_available "$basename[0-9]*")"
# prevent INTERFACE from being "eth" instead of "eth0"
[ "$INTERFACE" = "${INTERFACE%%[ \[\]0-9]*}" ] && INTERFACE=${INTERFACE}0
echo "INTERFACE_NEW=$INTERFACE"
fi
fi
write_rule "$match" "$INTERFACE" "$COMMENT"
unlock_rules_file
exit 0
|
