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7b86ada7 | 1 | <?xml version='1.0'?> |
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2 | <?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?> |
3 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
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4 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
5 | ||
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6 | <refentry id="udev"> |
7 | <refentryinfo> | |
7b86ada7 | 8 | <title>udev</title> |
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9 | <productname>systemd</productname> |
10 | <authorgroup> | |
11 | <author> | |
12 | <contrib>Developer</contrib> | |
13 | <firstname>Greg</firstname> | |
14 | <surname>Kroah-Hartmann</surname> | |
15 | <email>greg@kroah.com</email> | |
16 | </author> | |
17 | <author> | |
18 | <contrib>Developer</contrib> | |
19 | <firstname>Kay</firstname> | |
20 | <surname>Sievers</surname> | |
21 | <email>kay@vrfy.org</email> | |
22 | </author> | |
23 | </authorgroup> | |
63749b1a KS |
24 | </refentryinfo> |
25 | ||
26 | <refmeta> | |
27 | <refentrytitle>udev</refentrytitle> | |
28 | <manvolnum>7</manvolnum> | |
29 | </refmeta> | |
30 | ||
31 | <refnamediv> | |
32 | <refname>udev</refname> | |
eb75d0ed | 33 | <refpurpose>Dynamic device management</refpurpose> |
63749b1a KS |
34 | </refnamediv> |
35 | ||
36 | <refsect1><title>Description</title> | |
37 | <para>udev supplies the system software with device events, manages permissions | |
38 | of device nodes and may create additional symlinks in the <filename>/dev</filename> | |
39 | directory, or renames network interfaces. The kernel usually just assigns unpredictable | |
40 | device names based on the order of discovery. Meaningful symlinks or network device | |
41 | names provide a way to reliably identify devices based on their properties or | |
42 | current configuration.</para> | |
43 | ||
b79f817b | 44 | <para>The udev daemon, <citerefentry><refentrytitle>systemd-udevd.service</refentrytitle> |
0e4fa2ab | 45 | <manvolnum>8</manvolnum></citerefentry>, receives device uevents directly from |
63749b1a KS |
46 | the kernel whenever a device is added or removed from the system, or it changes its |
47 | state. When udev receives a device event, it matches its configured set of rules | |
0e846301 MW |
48 | against various device attributes to identify the device. Rules that match may |
49 | provide additional device information to be stored in the udev database or | |
63749b1a KS |
50 | to be used to create meaningful symlink names.</para> |
51 | ||
0e846301 | 52 | <para>All device information udev processes is stored in the udev database and |
63749b1a | 53 | sent out to possible event subscribers. Access to all stored data and the event |
17fd0f60 | 54 | sources is provided by the library libudev.</para> |
63749b1a KS |
55 | </refsect1> |
56 | ||
eb75d0ed | 57 | <refsect1><title>Rules Files</title> |
63749b1a | 58 | <para>The udev rules are read from the files located in the |
12a362be | 59 | system rules directory <filename>/usr/lib/udev/rules.d</filename>, |
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60 | the volatile runtime directory <filename>/run/udev/rules.d</filename> |
61 | and the local administration directory <filename>/etc/udev/rules.d</filename>. | |
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62 | All rules files are collectively sorted and processed in lexical order, |
63 | regardless of the directories in which they live. However, files with | |
e9dd9f95 | 64 | identical filenames replace each other. Files in <filename>/etc</filename> |
91418155 | 65 | have the highest priority, files in <filename>/run</filename> take precedence |
e0e009c0 | 66 | over files with the same name in <filename>/usr/lib</filename>. This can be |
91418155 KS |
67 | used to override a system-supplied rules file with a local file if needed; |
68 | a symlink in <filename>/etc</filename> with the same name as a rules file in | |
e0e009c0 | 69 | <filename>/usr/lib</filename>, pointing to <filename>/dev/null</filename>, |
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70 | disables the rules file entirely. Rule files must have the extension |
71 | <filename>.rules</filename>; other extensions are ignored.</para> | |
63749b1a | 72 | |
feedf8f3 | 73 | <para>Every line in the rules file contains at least one key-value pair. |
909f413d | 74 | Except for empty lines or lines beginning with <literal>#</literal>, which are ignored. |
bb31a4ac | 75 | There are two kinds of keys: match and assignment. |
6ec0ac43 TG |
76 | If all match keys match against their values, the rule gets applied and the |
77 | assignment keys get the specified values assigned.</para> | |
63749b1a KS |
78 | |
79 | <para>A matching rule may rename a network interface, add symlinks | |
80 | pointing to the device node, or run a specified program as part of | |
81 | the event handling.</para> | |
82 | ||
55f5037c MW |
83 | <para>A rule consists of a comma-separated list of one or more key-value pairs. |
84 | Each key has a distinct operation, depending on the used operator. Valid | |
63749b1a KS |
85 | operators are:</para> |
86 | <variablelist> | |
87 | <varlistentry> | |
6b76fa66 | 88 | <term><literal>==</literal></term> |
63749b1a KS |
89 | <listitem> |
90 | <para>Compare for equality.</para> | |
91 | </listitem> | |
92 | </varlistentry> | |
93 | ||
94 | <varlistentry> | |
6b76fa66 | 95 | <term><literal>!=</literal></term> |
63749b1a KS |
96 | <listitem> |
97 | <para>Compare for inequality.</para> | |
98 | </listitem> | |
99 | </varlistentry> | |
100 | ||
101 | <varlistentry> | |
6b76fa66 | 102 | <term><literal>=</literal></term> |
63749b1a | 103 | <listitem> |
0e846301 | 104 | <para>Assign a value to a key. Keys that represent a list are reset |
63749b1a KS |
105 | and only this single value is assigned.</para> |
106 | </listitem> | |
107 | </varlistentry> | |
108 | ||
109 | <varlistentry> | |
6b76fa66 | 110 | <term><literal>+=</literal></term> |
63749b1a KS |
111 | <listitem> |
112 | <para>Add the value to a key that holds a list of entries.</para> | |
113 | </listitem> | |
114 | </varlistentry> | |
115 | ||
116 | <varlistentry> | |
6b76fa66 | 117 | <term><literal>:=</literal></term> |
63749b1a | 118 | <listitem> |
2bf11540 | 119 | <para>Assign a value to a key finally; disallow any later changes.</para> |
63749b1a KS |
120 | </listitem> |
121 | </varlistentry> | |
122 | </variablelist> | |
123 | ||
124 | <para>The following key names can be used to match against device properties. | |
125 | Some of the keys also match against properties of the parent devices in sysfs, | |
126 | not only the device that has generated the event. If multiple keys that match | |
127 | a parent device are specified in a single rule, all these keys must match at | |
128 | one and the same parent device.</para> | |
ccc9a4f9 | 129 | <variablelist class='udev-directives'> |
63749b1a | 130 | <varlistentry> |
909f413d | 131 | <term><varname>ACTION</varname></term> |
63749b1a KS |
132 | <listitem> |
133 | <para>Match the name of the event action.</para> | |
134 | </listitem> | |
135 | </varlistentry> | |
136 | ||
137 | <varlistentry> | |
909f413d | 138 | <term><varname>DEVPATH</varname></term> |
63749b1a KS |
139 | <listitem> |
140 | <para>Match the devpath of the event device.</para> | |
141 | </listitem> | |
142 | </varlistentry> | |
143 | ||
144 | <varlistentry> | |
909f413d | 145 | <term><varname>KERNEL</varname></term> |
63749b1a KS |
146 | <listitem> |
147 | <para>Match the name of the event device.</para> | |
148 | </listitem> | |
149 | </varlistentry> | |
150 | ||
151 | <varlistentry> | |
909f413d | 152 | <term><varname>NAME</varname></term> |
63749b1a | 153 | <listitem> |
220893b3 KS |
154 | <para>Match the name of a network interface. It can be used once the |
155 | NAME key has been set in one of the preceding rules.</para> | |
63749b1a KS |
156 | </listitem> |
157 | </varlistentry> | |
158 | ||
159 | <varlistentry> | |
909f413d | 160 | <term><varname>SYMLINK</varname></term> |
63749b1a KS |
161 | <listitem> |
162 | <para>Match the name of a symlink targeting the node. It can | |
163 | be used once a SYMLINK key has been set in one of the preceding | |
164 | rules. There may be multiple symlinks; only one needs to match. | |
165 | </para> | |
166 | </listitem> | |
167 | </varlistentry> | |
168 | ||
169 | <varlistentry> | |
909f413d | 170 | <term><varname>SUBSYSTEM</varname></term> |
63749b1a KS |
171 | <listitem> |
172 | <para>Match the subsystem of the event device.</para> | |
173 | </listitem> | |
174 | </varlistentry> | |
175 | <varlistentry> | |
909f413d | 176 | <term><varname>DRIVER</varname></term> |
63749b1a | 177 | <listitem> |
2e7f69eb | 178 | <para>Match the driver name of the event device. Only set this key for devices |
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179 | which are bound to a driver at the time the event is generated.</para> |
180 | </listitem> | |
181 | </varlistentry> | |
182 | <varlistentry> | |
909f413d | 183 | <term><varname>ATTR{<replaceable>filename</replaceable>}</varname></term> |
63749b1a KS |
184 | <listitem> |
185 | <para>Match sysfs attribute values of the event device. Trailing | |
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186 | whitespace in the attribute values is ignored unless the specified match |
187 | value itself contains trailing whitespace. | |
63749b1a KS |
188 | </para> |
189 | </listitem> | |
190 | </varlistentry> | |
191 | ||
192 | <varlistentry> | |
909f413d | 193 | <term><varname>KERNELS</varname></term> |
63749b1a KS |
194 | <listitem> |
195 | <para>Search the devpath upwards for a matching device name.</para> | |
196 | </listitem> | |
197 | </varlistentry> | |
198 | ||
199 | <varlistentry> | |
909f413d | 200 | <term><varname>SUBSYSTEMS</varname></term> |
63749b1a KS |
201 | <listitem> |
202 | <para>Search the devpath upwards for a matching device subsystem name.</para> | |
203 | </listitem> | |
204 | </varlistentry> | |
205 | ||
206 | <varlistentry> | |
909f413d | 207 | <term><varname>DRIVERS</varname></term> |
63749b1a KS |
208 | <listitem> |
209 | <para>Search the devpath upwards for a matching device driver name.</para> | |
210 | </listitem> | |
211 | </varlistentry> | |
212 | ||
213 | <varlistentry> | |
909f413d | 214 | <term><varname>ATTRS{<replaceable>filename</replaceable>}</varname></term> |
63749b1a KS |
215 | <listitem> |
216 | <para>Search the devpath upwards for a device with matching sysfs attribute values. | |
909f413d | 217 | If multiple <varname>ATTRS</varname> matches are specified, all of them |
65e039c2 MW |
218 | must match on the same device. Trailing whitespace in the attribute values is ignored |
219 | unless the specified match value itself contains trailing whitespace.</para> | |
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220 | </listitem> |
221 | </varlistentry> | |
222 | ||
7df0ed83 | 223 | <varlistentry> |
909f413d | 224 | <term><varname>TAGS</varname></term> |
7df0ed83 KS |
225 | <listitem> |
226 | <para>Search the devpath upwards for a device with matching tag.</para> | |
227 | </listitem> | |
228 | </varlistentry> | |
229 | ||
63749b1a | 230 | <varlistentry> |
909f413d | 231 | <term><varname>ENV{<replaceable>key</replaceable>}</varname></term> |
63749b1a KS |
232 | <listitem> |
233 | <para>Match against a device property value.</para> | |
234 | </listitem> | |
235 | </varlistentry> | |
236 | ||
237 | <varlistentry> | |
909f413d | 238 | <term><varname>TAG</varname></term> |
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239 | <listitem> |
240 | <para>Match against a device tag.</para> | |
241 | </listitem> | |
242 | </varlistentry> | |
243 | ||
244 | <varlistentry> | |
909f413d | 245 | <term><varname>TEST{<replaceable>octal mode mask</replaceable>}</varname></term> |
63749b1a KS |
246 | <listitem> |
247 | <para>Test the existence of a file. An octal mode mask can be specified | |
248 | if needed.</para> | |
249 | </listitem> | |
250 | </varlistentry> | |
251 | ||
252 | <varlistentry> | |
909f413d | 253 | <term><varname>PROGRAM</varname></term> |
63749b1a | 254 | <listitem> |
2e9820e3 MW |
255 | <para>Execute a program to determine whether there |
256 | is a match; the key is true if the program returns | |
63749b1a | 257 | successfully. The device properties are made available to the |
6db27428 | 258 | executed program in the environment. The program's standard ouput |
bcddd5bf JSJ |
259 | is available in the <varname>RESULT</varname> key.</para> |
260 | <para>This can only be used for very short-running foreground tasks. For details, | |
909f413d | 261 | see <varname>RUN</varname>.</para> |
63749b1a KS |
262 | </listitem> |
263 | </varlistentry> | |
264 | ||
265 | <varlistentry> | |
909f413d | 266 | <term><varname>RESULT</varname></term> |
63749b1a | 267 | <listitem> |
bcddd5bf JSJ |
268 | <para>Match the returned string of the last <varname>PROGRAM</varname> call. |
269 | This key can be used in the same or in any later rule after a | |
270 | <varname>PROGRAM</varname> call.</para> | |
63749b1a KS |
271 | </listitem> |
272 | </varlistentry> | |
273 | </variablelist> | |
274 | ||
eb75d0ed | 275 | <para>Most of the fields support shell glob pattern matching. The following |
63749b1a KS |
276 | pattern characters are supported:</para> |
277 | <variablelist> | |
278 | <varlistentry> | |
6b76fa66 | 279 | <term><literal>*</literal></term> |
63749b1a | 280 | <listitem> |
954e9c52 | 281 | <para>Matches zero or more characters.</para> |
63749b1a KS |
282 | </listitem> |
283 | </varlistentry> | |
284 | <varlistentry> | |
6b76fa66 | 285 | <term><literal>?</literal></term> |
63749b1a KS |
286 | <listitem> |
287 | <para>Matches any single character.</para> | |
288 | </listitem> | |
289 | </varlistentry> | |
290 | <varlistentry> | |
6b76fa66 | 291 | <term><literal>[]</literal></term> |
63749b1a KS |
292 | <listitem> |
293 | <para>Matches any single character specified within the brackets. For | |
909f413d ZJS |
294 | example, the pattern string <literal>tty[SR]</literal> |
295 | would match either <literal>ttyS</literal> or <literal>ttyR</literal>. | |
296 | Ranges are also supported via the <literal>-</literal> character. | |
bcddd5bf JSJ |
297 | For example, to match on the range of all digits, the pattern |
298 | <literal>[0-9]</literal> could be used. If the first character | |
299 | following the <literal>[</literal> is a <literal>!</literal>, | |
300 | any characters not enclosed are matched.</para> | |
63749b1a KS |
301 | </listitem> |
302 | </varlistentry> | |
303 | </variablelist> | |
304 | ||
305 | <para>The following keys can get values assigned:</para> | |
ccc9a4f9 | 306 | <variablelist class='udev-directives'> |
63749b1a | 307 | <varlistentry> |
909f413d | 308 | <term><varname>NAME</varname></term> |
63749b1a | 309 | <listitem> |
220893b3 | 310 | <para>The name to use for a network interface. The name of a device node |
bb31a4ac | 311 | cannot be changed by udev, only additional symlinks can be created.</para> |
63749b1a KS |
312 | </listitem> |
313 | </varlistentry> | |
314 | ||
315 | <varlistentry> | |
909f413d | 316 | <term><varname>SYMLINK</varname></term> |
63749b1a | 317 | <listitem> |
933b5623 | 318 | <para>The name of a symlink targeting the node. Every matching rule adds |
b1239c3f KS |
319 | this value to the list of symlinks to be created.</para> |
320 | <para>The set of characters to name a symlink is limited. Allowed | |
909f413d ZJS |
321 | characters are <literal>0-9A-Za-z#+-.:=@_/</literal>, valid UTF-8 character |
322 | sequences, and <literal>\x00</literal> hex encoding. All other | |
323 | characters are replaced by a <literal>_</literal> character.</para> | |
b1239c3f KS |
324 | <para>Multiple symlinks may be specified by separating the names by the |
325 | space character. In case multiple devices claim the same name, the link | |
326 | always points to the device with the highest link_priority. If the current | |
327 | device goes away, the links are re-evaluated and the device with the | |
328 | next highest link_priority becomes the owner of the link. If no | |
329 | link_priority is specified, the order of the devices (and which one of | |
330 | them owns the link) is undefined.</para> | |
331 | <para>Symlink names must never conflict with the kernel's default device | |
332 | node names, as that would result in unpredictable behavior. | |
63749b1a KS |
333 | </para> |
334 | </listitem> | |
335 | </varlistentry> | |
336 | ||
337 | <varlistentry> | |
909f413d | 338 | <term><varname>OWNER</varname>, <varname>GROUP</varname>, <varname>MODE</varname></term> |
63749b1a | 339 | <listitem> |
91418155 | 340 | <para>The permissions for the device node. Every specified value overrides |
63749b1a KS |
341 | the compiled-in default value.</para> |
342 | </listitem> | |
343 | </varlistentry> | |
344 | ||
c26547d6 KS |
345 | <varlistentry> |
346 | <term><varname>SECLABEL{<replaceable>module</replaceable>}</varname></term> | |
347 | <listitem> | |
348 | <para>Applies the specified Linux Security Module label to the device node.</para> | |
349 | </listitem> | |
350 | </varlistentry> | |
351 | ||
63749b1a | 352 | <varlistentry> |
909f413d | 353 | <term><varname>ATTR{<replaceable>key</replaceable>}</varname></term> |
63749b1a KS |
354 | <listitem> |
355 | <para>The value that should be written to a sysfs attribute of the | |
356 | event device.</para> | |
357 | </listitem> | |
358 | </varlistentry> | |
359 | ||
360 | <varlistentry> | |
909f413d | 361 | <term><varname>ENV{<replaceable>key</replaceable>}</varname></term> |
63749b1a | 362 | <listitem> |
909f413d | 363 | <para>Set a device property value. Property names with a leading <literal>.</literal> |
ed9c5fb7 | 364 | are neither stored in the database nor exported to events or |
bcddd5bf JSJ |
365 | external tools (run by, for example, the <varname>PROGRAM</varname> |
366 | match key).</para> | |
63749b1a KS |
367 | </listitem> |
368 | </varlistentry> | |
369 | ||
370 | <varlistentry> | |
909f413d | 371 | <term><varname>TAG</varname></term> |
63749b1a KS |
372 | <listitem> |
373 | <para>Attach a tag to a device. This is used to filter events for users | |
374 | of libudev's monitor functionality, or to enumerate a group of tagged | |
375 | devices. The implementation can only work efficiently if only a few | |
376 | tags are attached to a device. It is only meant to be used in | |
377 | contexts with specific device filter requirements, and not as a | |
378 | general-purpose flag. Excessive use might result in inefficient event | |
379 | handling.</para> | |
380 | </listitem> | |
381 | </varlistentry> | |
382 | ||
383 | <varlistentry> | |
909f413d | 384 | <term><varname>RUN{<replaceable>type</replaceable>}</varname></term> |
63749b1a | 385 | <listitem> |
bcddd5bf JSJ |
386 | <para>Add a program to the list of programs to be executed after |
387 | processing all the rules for a specific event, depending on | |
388 | <literal>type</literal>:</para> | |
72c6cf8f TG |
389 | <variablelist> |
390 | <varlistentry> | |
391 | <term><literal>program</literal></term> | |
392 | <listitem> | |
393 | <para>Execute an external program specified as the assigned | |
bcddd5bf JSJ |
394 | value. If no absolute path is given, the program is expected |
395 | to live in <filename>/usr/lib/udev</filename>; otherwise, the | |
396 | absolute path must be specified.</para> | |
397 | <para>This is the default if no <replaceable>type</replaceable> | |
398 | is specified.</para> | |
72c6cf8f TG |
399 | </listitem> |
400 | </varlistentry> | |
401 | <varlistentry> | |
402 | <term><literal>builtin</literal></term> | |
403 | <listitem> | |
bcddd5bf JSJ |
404 | <para>As <varname>program</varname>, but use one of the |
405 | built-in programs rather than an external one.</para> | |
72c6cf8f TG |
406 | </listitem> |
407 | </varlistentry> | |
408 | </variablelist> | |
409 | <para>The program name and following arguments are separated by spaces. | |
410 | Single quotes can be used to specify arguments with spaces.</para> | |
b45f770f | 411 | <para>This can only be used for very short-running foreground tasks. Running an |
2b76eb68 | 412 | event process for a long period of time may block all further events for |
b45f770f | 413 | this or a dependent device.</para> |
bcddd5bf | 414 | <para>Starting daemons or other long-running processes is not appropriate |
b45f770f KS |
415 | for udev; the forked processes, detached or not, will be unconditionally |
416 | killed after the event handling has finished.</para> | |
63749b1a KS |
417 | </listitem> |
418 | </varlistentry> | |
419 | ||
420 | <varlistentry> | |
909f413d | 421 | <term><varname>LABEL</varname></term> |
63749b1a | 422 | <listitem> |
bcddd5bf | 423 | <para>A named label to which a <varname>GOTO</varname> may jump.</para> |
63749b1a KS |
424 | </listitem> |
425 | </varlistentry> | |
426 | ||
427 | <varlistentry> | |
909f413d | 428 | <term><varname>GOTO</varname></term> |
63749b1a | 429 | <listitem> |
bcddd5bf | 430 | <para>Jumps to the next <varname>LABEL</varname> with a matching name.</para> |
63749b1a KS |
431 | </listitem> |
432 | </varlistentry> | |
433 | ||
434 | <varlistentry> | |
909f413d | 435 | <term><varname>IMPORT{<replaceable>type</replaceable>}</varname></term> |
63749b1a KS |
436 | <listitem> |
437 | <para>Import a set of variables as device properties, | |
6b76fa66 | 438 | depending on <literal>type</literal>:</para> |
63749b1a KS |
439 | <variablelist> |
440 | <varlistentry> | |
6b76fa66 | 441 | <term><literal>program</literal></term> |
63749b1a KS |
442 | <listitem> |
443 | <para>Execute an external program specified as the assigned value and | |
444 | import its output, which must be in environment key | |
445 | format. Path specification, command/argument separation, | |
909f413d | 446 | and quoting work like in <varname>RUN</varname>.</para> |
63749b1a KS |
447 | </listitem> |
448 | </varlistentry> | |
449 | <varlistentry> | |
72c6cf8f TG |
450 | <term><literal>builtin</literal></term> |
451 | <listitem> | |
909f413d ZJS |
452 | <para>Similar to <literal>program</literal>, but use one of the |
453 | built-in programs rather than an external one.</para> | |
72c6cf8f TG |
454 | </listitem> |
455 | </varlistentry> | |
456 | <varlistentry> | |
6b76fa66 | 457 | <term><literal>file</literal></term> |
63749b1a | 458 | <listitem> |
b6a49cd6 MW |
459 | <para>Import a text file specified as the assigned value, the content |
460 | of which must be in environment key format.</para> | |
63749b1a KS |
461 | </listitem> |
462 | </varlistentry> | |
463 | <varlistentry> | |
6b76fa66 | 464 | <term><literal>db</literal></term> |
63749b1a KS |
465 | <listitem> |
466 | <para>Import a single property specified as the assigned value from the | |
467 | current device database. This works only if the database is already populated | |
468 | by an earlier event.</para> | |
469 | </listitem> | |
470 | </varlistentry> | |
c4f6dcc4 | 471 | <varlistentry> |
6b76fa66 | 472 | <term><literal>cmdline</literal></term> |
c4f6dcc4 | 473 | <listitem> |
ad9c70a8 | 474 | <para>Import a single property from the kernel command line. For simple flags |
909f413d | 475 | the value of the property is set to <literal>1</literal>.</para> |
c4f6dcc4 KS |
476 | </listitem> |
477 | </varlistentry> | |
63749b1a | 478 | <varlistentry> |
6b76fa66 | 479 | <term><literal>parent</literal></term> |
63749b1a KS |
480 | <listitem> |
481 | <para>Import the stored keys from the parent device by reading | |
482 | the database entry of the parent device. The value assigned to | |
483 | <option>IMPORT{parent}</option> is used as a filter of key names | |
eb75d0ed | 484 | to import (with the same shell glob pattern matching used for |
63749b1a KS |
485 | comparisons).</para> |
486 | </listitem> | |
487 | </varlistentry> | |
488 | </variablelist> | |
b45f770f KS |
489 | <para>This can only be used for very short-running foreground tasks. For details |
490 | see <option>RUN</option>.</para> | |
63749b1a KS |
491 | </listitem> |
492 | </varlistentry> | |
493 | ||
494 | <varlistentry> | |
909f413d | 495 | <term><varname>WAIT_FOR</varname></term> |
63749b1a | 496 | <listitem> |
793681cb MW |
497 | <para>Wait for a file to become available or until a timeout of |
498 | 10 seconds expires. The path is relative to the sysfs device; | |
499 | if no path is specified, this waits for an attribute to appear.</para> | |
63749b1a KS |
500 | </listitem> |
501 | </varlistentry> | |
502 | ||
503 | <varlistentry> | |
909f413d | 504 | <term><varname>OPTIONS</varname></term> |
63749b1a KS |
505 | <listitem> |
506 | <para>Rule and device options:</para> | |
ccc9a4f9 | 507 | <variablelist class='udev-directives'> |
63749b1a KS |
508 | <varlistentry> |
509 | <term><option>link_priority=<replaceable>value</replaceable></option></term> | |
510 | <listitem> | |
511 | <para>Specify the priority of the created symlinks. Devices with higher | |
512 | priorities overwrite existing symlinks of other devices. The default is 0.</para> | |
513 | </listitem> | |
514 | </varlistentry> | |
515 | <varlistentry> | |
516 | <term><option>event_timeout=</option></term> | |
517 | <listitem> | |
933b5623 MW |
518 | <para>Number of seconds an event waits for operations to finish before |
519 | giving up and terminating itself.</para> | |
63749b1a KS |
520 | </listitem> |
521 | </varlistentry> | |
522 | <varlistentry> | |
523 | <term><option>string_escape=<replaceable>none|replace</replaceable></option></term> | |
524 | <listitem> | |
525 | <para>Usually control and other possibly unsafe characters are replaced | |
526 | in strings used for device naming. The mode of replacement can be specified | |
527 | with this option.</para> | |
528 | </listitem> | |
529 | </varlistentry> | |
9fa68615 KS |
530 | <varlistentry> |
531 | <term><option>static_node=</option></term> | |
532 | <listitem> | |
bcddd5bf JSJ |
533 | <para>Apply the permissions specified in this rule to the |
534 | static device node with the specified name. Also, for every | |
535 | tag specified in this rule, create a symlink | |
84b6ad70 TG |
536 | in the directory |
537 | <filename>/run/udev/static_node-tags/<replaceable>tag</replaceable></filename> | |
bcddd5bf JSJ |
538 | pointing at the static device node with the specified name. |
539 | Static device node creation is performed by systemd-tmpfiles | |
540 | before systemd-udevd is started. The static nodes might not | |
541 | have a corresponding kernel device; they are used to trigger | |
542 | automatic kernel module loading when they are accessed.</para> | |
9fa68615 KS |
543 | </listitem> |
544 | </varlistentry> | |
63749b1a KS |
545 | <varlistentry> |
546 | <term><option>watch</option></term> | |
547 | <listitem> | |
bcddd5bf JSJ |
548 | <para>Watch the device node with inotify; when the node is |
549 | closed after being opened for writing, a change uevent is | |
550 | synthesized.</para> | |
63749b1a KS |
551 | </listitem> |
552 | </varlistentry> | |
3b529da4 KS |
553 | <varlistentry> |
554 | <term><option>nowatch</option></term> | |
555 | <listitem> | |
556 | <para>Disable the watching of a device node with inotify.</para> | |
557 | </listitem> | |
558 | </varlistentry> | |
63749b1a KS |
559 | </variablelist> |
560 | </listitem> | |
561 | </varlistentry> | |
562 | </variablelist> | |
563 | ||
bcddd5bf JSJ |
564 | <para>The <varname>NAME</varname>, <varname>SYMLINK</varname>, |
565 | <varname>PROGRAM</varname>, <varname>OWNER</varname>, | |
566 | <varname>GROUP</varname>, <varname>MODE</varname>, and | |
567 | <varname>RUN</varname> fields support simple string substitutions. | |
568 | The <varname>RUN</varname> substitutions are performed after all rules | |
569 | have been processed, right before the program is executed, allowing for | |
570 | the use of device properties set by earlier matching rules. For all other | |
571 | fields, substitutions are performed while the individual rule is being | |
572 | processed. The available substitutions are:</para> | |
ccc9a4f9 | 573 | <variablelist class='udev-directives'> |
63749b1a KS |
574 | <varlistentry> |
575 | <term><option>$kernel</option>, <option>%k</option></term> | |
576 | <listitem> | |
577 | <para>The kernel name for this device.</para> | |
578 | </listitem> | |
579 | </varlistentry> | |
580 | ||
581 | <varlistentry> | |
582 | <term><option>$number</option>, <option>%n</option></term> | |
583 | <listitem> | |
909f413d | 584 | <para>The kernel number for this device. For example, |
bcddd5bf JSJ |
585 | <literal>sda3</literal> has kernel number <literal>3</literal>. |
586 | </para> | |
63749b1a KS |
587 | </listitem> |
588 | </varlistentry> | |
589 | ||
590 | <varlistentry> | |
591 | <term><option>$devpath</option>, <option>%p</option></term> | |
592 | <listitem> | |
593 | <para>The devpath of the device.</para> | |
594 | </listitem> | |
595 | </varlistentry> | |
596 | ||
597 | <varlistentry> | |
598 | <term><option>$id</option>, <option>%b</option></term> | |
599 | <listitem> | |
bcddd5bf JSJ |
600 | <para>The name of the device matched while searching the devpath |
601 | upwards for <option>SUBSYSTEMS</option>, <option>KERNELS</option>, | |
602 | <option>DRIVERS</option>, and <option>ATTRS</option>. | |
63749b1a KS |
603 | </para> |
604 | </listitem> | |
605 | </varlistentry> | |
606 | ||
607 | <varlistentry> | |
608 | <term><option>$driver</option></term> | |
609 | <listitem> | |
bcddd5bf JSJ |
610 | <para>The driver name of the device matched while searching the |
611 | devpath upwards for <option>SUBSYSTEMS</option>, | |
612 | <option>KERNELS</option>, <option>DRIVERS</option>, and | |
613 | <option>ATTRS</option>. | |
63749b1a KS |
614 | </para> |
615 | </listitem> | |
616 | </varlistentry> | |
617 | ||
618 | <varlistentry> | |
619 | <term><option>$attr{<replaceable>file</replaceable>}</option>, <option>%s{<replaceable>file</replaceable>}</option></term> | |
620 | <listitem> | |
0e846301 | 621 | <para>The value of a sysfs attribute found at the device where |
bcddd5bf JSJ |
622 | all keys of the rule have matched. If the matching device does not |
623 | have such an attribute, and a previous <option>KERNELS</option>, | |
624 | <option>SUBSYSTEMS</option>, <option>DRIVERS</option>, or | |
625 | <option>ATTRS</option> test selected a parent device, then the | |
626 | attribute from that parent device is used. | |
627 | </para> | |
628 | <para>If the attribute is a symlink, the last element of the | |
629 | symlink target is returned as the value. | |
630 | </para> | |
63749b1a KS |
631 | </listitem> |
632 | </varlistentry> | |
633 | ||
634 | <varlistentry> | |
635 | <term><option>$env{<replaceable>key</replaceable>}</option>, <option>%E{<replaceable>key</replaceable>}</option></term> | |
636 | <listitem> | |
637 | <para>A device property value.</para> | |
638 | </listitem> | |
639 | </varlistentry> | |
640 | ||
641 | <varlistentry> | |
642 | <term><option>$major</option>, <option>%M</option></term> | |
643 | <listitem> | |
644 | <para>The kernel major number for the device.</para> | |
645 | </listitem> | |
646 | </varlistentry> | |
647 | ||
648 | <varlistentry> | |
649 | <term><option>$minor</option>, <option>%m</option></term> | |
650 | <listitem> | |
651 | <para>The kernel minor number for the device.</para> | |
652 | </listitem> | |
653 | </varlistentry> | |
654 | ||
655 | <varlistentry> | |
656 | <term><option>$result</option>, <option>%c</option></term> | |
657 | <listitem> | |
bcddd5bf JSJ |
658 | <para>The string returned by the external program requested with |
659 | <varname>PROGRAM</varname>. | |
21188522 | 660 | A single part of the string, separated by a space character, may be selected |
909f413d ZJS |
661 | by specifying the part number as an attribute: <literal>%c{N}</literal>. |
662 | If the number is followed by the <literal>+</literal> character, this part plus all remaining parts | |
663 | of the result string are substituted: <literal>%c{N+}</literal>.</para> | |
63749b1a KS |
664 | </listitem> |
665 | </varlistentry> | |
666 | ||
667 | <varlistentry> | |
668 | <term><option>$parent</option>, <option>%P</option></term> | |
669 | <listitem> | |
670 | <para>The node name of the parent device.</para> | |
671 | </listitem> | |
672 | </varlistentry> | |
673 | ||
674 | <varlistentry> | |
675 | <term><option>$name</option></term> | |
676 | <listitem> | |
220893b3 | 677 | <para>The current name of the device. If not changed by a rule, it is the |
63749b1a KS |
678 | name of the kernel device.</para> |
679 | </listitem> | |
680 | </varlistentry> | |
681 | ||
682 | <varlistentry> | |
683 | <term><option>$links</option></term> | |
684 | <listitem> | |
e8b5e4e5 | 685 | <para>A space-separated list of the current symlinks. The value is |
2d74bc75 | 686 | only set during a remove event or if an earlier rule assigned a value.</para> |
63749b1a KS |
687 | </listitem> |
688 | </varlistentry> | |
689 | ||
690 | <varlistentry> | |
691 | <term><option>$root</option>, <option>%r</option></term> | |
692 | <listitem> | |
693 | <para>The udev_root value.</para> | |
694 | </listitem> | |
695 | </varlistentry> | |
696 | ||
697 | <varlistentry> | |
698 | <term><option>$sys</option>, <option>%S</option></term> | |
699 | <listitem> | |
700 | <para>The sysfs mount point.</para> | |
701 | </listitem> | |
702 | </varlistentry> | |
703 | ||
704 | <varlistentry> | |
220893b3 | 705 | <term><option>$devnode</option>, <option>%N</option></term> |
63749b1a | 706 | <listitem> |
220893b3 | 707 | <para>The name of the device node.</para> |
63749b1a KS |
708 | </listitem> |
709 | </varlistentry> | |
710 | ||
711 | <varlistentry> | |
909f413d | 712 | <term><option>%%</option></term> |
63749b1a | 713 | <listitem> |
909f413d | 714 | <para>The <literal>%</literal> character itself.</para> |
63749b1a KS |
715 | </listitem> |
716 | </varlistentry> | |
717 | ||
718 | <varlistentry> | |
909f413d | 719 | <term><option>$$</option></term> |
63749b1a | 720 | <listitem> |
909f413d | 721 | <para>The <literal>$</literal> character itself.</para> |
63749b1a KS |
722 | </listitem> |
723 | </varlistentry> | |
724 | </variablelist> | |
63749b1a KS |
725 | </refsect1> |
726 | ||
eb75d0ed KS |
727 | <refsect1><title>Hardware Database Files</title> |
728 | <para>The hwdb files are read from the files located in the | |
729 | system hwdb directory <filename>/usr/lib/udev/hwdb.d</filename>, | |
730 | the volatile runtime directory <filename>/run/udev/hwdb.d</filename> | |
731 | and the local administration directory <filename>/etc/udev/hwdb.d</filename>. | |
0778c3db | 732 | All hwdb files are collectively sorted and processed in lexical order, |
eb75d0ed KS |
733 | regardless of the directories in which they live. However, files with |
734 | identical filenames replace each other. Files in <filename>/etc</filename> | |
735 | have the highest priority, files in <filename>/run</filename> take precedence | |
e0e009c0 | 736 | over files with the same name in <filename>/usr/lib</filename>. This can be |
eb75d0ed | 737 | used to override a system-supplied hwdb file with a local file if needed; |
0778c3db | 738 | a symlink in <filename>/etc</filename> with the same name as a hwdb file in |
e0e009c0 | 739 | <filename>/usr/lib</filename>, pointing to <filename>/dev/null</filename>, |
0778c3db | 740 | disables the hwdb file entirely. hwdb files must have the extension |
eb75d0ed KS |
741 | <filename>.hwdb</filename>; other extensions are ignored.</para> |
742 | ||
743 | <para>The hwdb file contains data records consisting of matches and | |
744 | associated key-value pairs. Every record in the hwdb starts with one or | |
745 | more match string, specifying a shell glob to compare the database | |
746 | lookup string against. Multiple match lines are specified in additional | |
747 | consecutive lines. Every match line is compared indivdually, they are | |
748 | combined by OR. Every match line must start at the first character of | |
749 | the line.</para> | |
750 | ||
751 | <para>The match lines are followed by one or more key-value pair lines, which | |
752 | are recognized by a leading space character. The key name and value are separated | |
753 | by <literal>=</literal>. An empty line signifies the end | |
754 | of a record. Lines beginning with <literal>#</literal> are ignored.</para> | |
755 | ||
756 | <para>The content of all hwdb files is read by | |
757 | <citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
758 | and compiled to a binary database located at <filename>/etc/udev/hwdb.bin</filename>. | |
759 | During runtime only the binary database is used.</para> | |
760 | </refsect1> | |
761 | ||
1f06807c | 762 | <refsect1><title>Network Link Configuration</title> |
22925e1a | 763 | <para>Network link configuration is performed by the <literal>net_setup_link</literal> |
1f06807c TG |
764 | udev builtin.</para> |
765 | ||
766 | <para>The link files are read from the files located in the | |
767 | system network directory <filename>/usr/lib/systemd/network</filename>, | |
768 | the volatile runtime network directory <filename>/run/systemd/network</filename> | |
769 | and the local administration network directory <filename>/etc/systemd/network</filename>. | |
22925e1a | 770 | Link files must have the extension <filename>.link</filename>; other extensions are ignored. |
1f06807c TG |
771 | All link files are collectively sorted and processed in lexical order, |
772 | regardless of the directories in which they live. However, files with | |
773 | identical filenames replace each other. Files in <filename>/etc</filename> | |
774 | have the highest priority, files in <filename>/run</filename> take precedence | |
e0e009c0 | 775 | over files with the same name in <filename>/usr/lib</filename>. This can be |
1f06807c TG |
776 | used to override a system-supplied link file with a local file if needed; |
777 | a symlink in <filename>/etc</filename> with the same name as a link file in | |
e0e009c0 | 778 | <filename>/usr/lib</filename>, pointing to <filename>/dev/null</filename>, |
2b51bd3c | 779 | disables the link file entirely.</para> |
1f06807c TG |
780 | |
781 | <para>The link file contains a <literal>[Match]</literal> section, which | |
782 | determines if a given link file may be applied to a given device; and a | |
783 | <literal>[Link]</literal> section specifying how the device should be | |
784 | configured. The first (in lexical order) of the link files that matches | |
785 | a given device is applied.</para> | |
786 | ||
787 | <para>A link file is said to match a device if each of the entries in the | |
788 | <literal>[Match]</literal> section matches, or if the section is empty. | |
789 | The following keys are accepted:</para> | |
790 | ||
791 | <variablelist class='network-directives'> | |
792 | <varlistentry> | |
c8f57f59 | 793 | <term><varname>MACAddress=</varname></term> |
1f06807c TG |
794 | <listitem> |
795 | <para>The hardware address. | |
796 | </para> | |
797 | </listitem> | |
798 | </varlistentry> | |
799 | <varlistentry> | |
c8f57f59 | 800 | <term><varname>Path=</varname></term> |
1f06807c | 801 | <listitem> |
a03c5fd2 TG |
802 | <para>The persistent path, as exposed by the udev property <literal>ID_PATH</literal>. |
803 | May contain shell style globs.</para> | |
1f06807c TG |
804 | </listitem> |
805 | </varlistentry> | |
806 | <varlistentry> | |
c8f57f59 | 807 | <term><varname>Driver=</varname></term> |
1f06807c | 808 | <listitem> |
9b1c2626 | 809 | <para>The driver currently bound to the device, as exposed by the |
bf175aaf TG |
810 | udev property <literal>DRIVER</literal> of its parent device, or if |
811 | that is not set the driver as exposed by <literal>ethtool -i</literal> | |
812 | of the device itself.</para> | |
1f06807c TG |
813 | </listitem> |
814 | </varlistentry> | |
815 | <varlistentry> | |
c8f57f59 | 816 | <term><varname>Type=</varname></term> |
1f06807c | 817 | <listitem> |
d69b12ac | 818 | <para>The device type, as exposed by the udev property <literal>DEVTYPE</literal>.</para> |
1f06807c TG |
819 | </listitem> |
820 | </varlistentry> | |
a03c5fd2 | 821 | <varlistentry> |
c8f57f59 | 822 | <term><varname>Host=</varname></term> |
a03c5fd2 TG |
823 | <listitem> |
824 | <para>Matches against the hostname or machine ID of the | |
825 | host. See <literal>ConditionHost=</literal> in | |
826 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
827 | for details.</para> | |
828 | </listitem> | |
829 | </varlistentry> | |
830 | <varlistentry> | |
c8f57f59 | 831 | <term><varname>Virtualization=</varname></term> |
a03c5fd2 TG |
832 | <listitem> |
833 | <para>Checks whether the system is executed in a virtualized | |
834 | environment and optionally test whether it is a specific | |
835 | implementation. See <literal>ConditionVirtualization=</literal> in | |
836 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
837 | for details.</para> | |
838 | </listitem> | |
839 | </varlistentry> | |
840 | <varlistentry> | |
c8f57f59 | 841 | <term><varname>KernelCommandLine=</varname></term> |
a03c5fd2 TG |
842 | <listitem> |
843 | <para>Checks whether a specific kernel command line option is | |
844 | set (or if prefixed with the exclamation mark unset). See | |
845 | <literal>ConditionKernelCommandLine=</literal> in | |
846 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
847 | for details.</para> | |
848 | </listitem> | |
849 | </varlistentry> | |
edbb03e9 | 850 | <varlistentry> |
c8f57f59 | 851 | <term><varname>Architecture=</varname></term> |
edbb03e9 TG |
852 | <listitem> |
853 | <para>Checks whether the system is running on a specific | |
854 | architecture. See <literal>ConditionArchitecture=</literal> in | |
855 | <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
856 | for details.</para> | |
857 | </listitem> | |
858 | </varlistentry> | |
1f06807c TG |
859 | </variablelist> |
860 | ||
861 | <para>The <literal>[Link]</literal> section accepts the following keys:</para> | |
862 | ||
863 | <variablelist class='network-directives'> | |
864 | <varlistentry> | |
c8f57f59 | 865 | <term><varname>Description=</varname></term> |
1f06807c | 866 | <listitem> |
d2df0d0e TG |
867 | <para>A description of the device.</para> |
868 | </listitem> | |
869 | </varlistentry> | |
870 | <varlistentry> | |
c8f57f59 | 871 | <term><varname>Alias=</varname></term> |
d2df0d0e TG |
872 | <listitem> |
873 | <para>The <literal>ifalias</literal> is set to this value.</para> | |
1f06807c TG |
874 | </listitem> |
875 | </varlistentry> | |
876 | <varlistentry> | |
c8f57f59 | 877 | <term><varname>MACAddressPolicy=</varname></term> |
1f06807c | 878 | <listitem> |
bcddd5bf JSJ |
879 | <para>The policy by which the MAC address should be set. The |
880 | available policies are: | |
881 | </para> | |
1f06807c TG |
882 | <variablelist> |
883 | <varlistentry> | |
884 | <term><literal>persistent</literal></term> | |
885 | <listitem> | |
bcddd5bf JSJ |
886 | <para>If the hardware has a persistent MAC address, as most |
887 | hardware should, and this is used by the kernel, nothing is | |
888 | done. Otherwise, a new MAC address is generated which is | |
889 | guaranteed to be the same on every boot for the given | |
890 | machine and the given device, but which is otherwise random. | |
1f06807c TG |
891 | </para> |
892 | </listitem> | |
893 | </varlistentry> | |
894 | <varlistentry> | |
895 | <term><literal>random</literal></term> | |
896 | <listitem> | |
bcddd5bf JSJ |
897 | <para>If the kernel is using a random MAC address, nothing is |
898 | done. Otherwise, a new address is randomly generated each | |
899 | time the device appears, typically at boot. | |
900 | </para> | |
1f06807c TG |
901 | </listitem> |
902 | </varlistentry> | |
903 | </variablelist> | |
904 | </listitem> | |
905 | </varlistentry> | |
906 | <varlistentry> | |
c8f57f59 | 907 | <term><varname>MACAddress=</varname></term> |
1f06807c | 908 | <listitem> |
c8f57f59 | 909 | <para>The MAC address to use, if no <literal>MACAddressPolicy=</literal> |
bcddd5bf JSJ |
910 | is specified. |
911 | </para> | |
1f06807c TG |
912 | </listitem> |
913 | </varlistentry> | |
914 | <varlistentry> | |
c8f57f59 | 915 | <term><varname>NamePolicy=</varname></term> |
1f06807c | 916 | <listitem> |
bcddd5bf JSJ |
917 | <para>An ordered, space-separated list of policies by which the |
918 | interface name should be set. <literal>NamePolicy</literal> may | |
38bf2b26 | 919 | be disabled by specifying <literal>net.ifnames=0</literal> on the |
bcddd5bf | 920 | kernel commandline. Each of the policies may fail, and the first |
38bf2b26 | 921 | successful one is used. The name is not set directly, but |
bcddd5bf JSJ |
922 | is exported to udev as the property <literal>ID_NET_NAME</literal>, |
923 | which is, by default, used by a udev rule to set | |
924 | <literal>NAME</literal>. The available policies are: | |
925 | </para> | |
1f06807c | 926 | <variablelist> |
e51660ae TG |
927 | <varlistentry> |
928 | <term><literal>database</literal></term> | |
929 | <listitem> | |
930 | <para>The name is set based on entries in the Hardware | |
931 | Database with the key | |
932 | <literal>ID_NET_NAME_FROM_DATABASE</literal>. | |
933 | </para> | |
934 | </listitem> | |
935 | </varlistentry> | |
1f06807c TG |
936 | <varlistentry> |
937 | <term><literal>onboard</literal></term> | |
938 | <listitem> | |
bcddd5bf JSJ |
939 | <para>The name is set based on information given by the |
940 | firmware for on-board devices, as exported by the udev | |
941 | property <literal>ID_NET_NAME_ONBOARD</literal>. | |
942 | </para> | |
1f06807c TG |
943 | </listitem> |
944 | </varlistentry> | |
945 | <varlistentry> | |
946 | <term><literal>slot</literal></term> | |
947 | <listitem> | |
bcddd5bf JSJ |
948 | <para>The name is set based on information given by the |
949 | firmware for hot-plug devices, as exported by the udev | |
950 | property <literal>ID_NET_NAME_SLOT</literal>. | |
951 | </para> | |
1f06807c TG |
952 | </listitem> |
953 | </varlistentry> | |
954 | <varlistentry> | |
955 | <term><literal>path</literal></term> | |
956 | <listitem> | |
bcddd5bf JSJ |
957 | <para>The name is set based on the device's physical location, |
958 | as exported by the udev property | |
959 | <literal>ID_NET_NAME_PATH</literal>. | |
960 | </para> | |
1f06807c TG |
961 | </listitem> |
962 | </varlistentry> | |
963 | <varlistentry> | |
964 | <term><literal>mac</literal></term> | |
965 | <listitem> | |
bcddd5bf JSJ |
966 | <para>The name is set based on the device's persistent MAC |
967 | address, as exported by the udev property | |
968 | <literal>ID_NET_NAME_MAC</literal>. | |
969 | </para> | |
1f06807c TG |
970 | </listitem> |
971 | </varlistentry> | |
972 | </variablelist> | |
973 | </listitem> | |
974 | </varlistentry> | |
975 | <varlistentry> | |
c8f57f59 | 976 | <term><varname>Name=</varname></term> |
1f06807c | 977 | <listitem> |
bcddd5bf | 978 | <para>The interface name to use in case all the policies specified |
c8f57f59 LP |
979 | in <varname>NamePolicy=</varname> fail, or in case |
980 | <varname>NamePolicy=</varname> is missing or disabled. | |
bcddd5bf | 981 | </para> |
1f06807c TG |
982 | </listitem> |
983 | </varlistentry> | |
984 | <varlistentry> | |
733f7a2c | 985 | <term><varname>MTUBytes=</varname></term> |
1f06807c | 986 | <listitem> |
5556b5fe LP |
987 | <para>The maximum transmission unit in bytes to set for |
988 | the device. The usual suffixes K, M, G, are supported and | |
989 | are understood to the base of 1024.</para> | |
1f06807c TG |
990 | </listitem> |
991 | </varlistentry> | |
992 | <varlistentry> | |
733f7a2c | 993 | <term><varname>BitsPerSecond=</varname></term> |
1f06807c | 994 | <listitem> |
5556b5fe LP |
995 | <para>The speed to set for the device, the value is |
996 | rounded down to the nearest Mbps. The usual suffixes K, M, | |
997 | G, are supported and are understood to the base of | |
998 | 1000.</para> | |
1f06807c TG |
999 | </listitem> |
1000 | </varlistentry> | |
1001 | <varlistentry> | |
c8f57f59 | 1002 | <term><varname>Duplex=</varname></term> |
1f06807c | 1003 | <listitem> |
bcddd5bf JSJ |
1004 | <para>The duplex mode to set for the device. The accepted values |
1005 | are <literal>half</literal> and <literal>full</literal>. | |
1006 | </para> | |
1f06807c TG |
1007 | </listitem> |
1008 | </varlistentry> | |
1009 | <varlistentry> | |
c8f57f59 | 1010 | <term><varname>WakeOnLan=</varname></term> |
1f06807c | 1011 | <listitem> |
bcddd5bf JSJ |
1012 | <para>The Wake-on-LAN policy to set for the device. The supported |
1013 | values are: | |
1014 | </para> | |
1f06807c TG |
1015 | <variablelist> |
1016 | <varlistentry> | |
1017 | <term><literal>phy</literal></term> | |
1018 | <listitem> | |
1019 | <para>Wake on PHY activity.</para> | |
1020 | </listitem> | |
1021 | </varlistentry> | |
1022 | <varlistentry> | |
1023 | <term><literal>magic</literal></term> | |
1024 | <listitem> | |
bcddd5bf | 1025 | <para>Wake on receipt of a magic packet.</para> |
1f06807c TG |
1026 | </listitem> |
1027 | </varlistentry> | |
1028 | <varlistentry> | |
1029 | <term><literal>off</literal></term> | |
1030 | <listitem> | |
1031 | <para>Never wake.</para> | |
1032 | </listitem> | |
1033 | </varlistentry> | |
1034 | </variablelist> | |
1035 | </listitem> | |
1036 | </varlistentry> | |
1037 | </variablelist> | |
1038 | </refsect1> | |
1039 | ||
63749b1a KS |
1040 | <refsect1> |
1041 | <title>See Also</title> | |
bcddd5bf JSJ |
1042 | <para> |
1043 | <citerefentry> | |
b79f817b | 1044 | <refentrytitle>systemd-udevd.service</refentrytitle><manvolnum>8</manvolnum> |
ad29a9f1 | 1045 | </citerefentry>, |
63749b1a KS |
1046 | <citerefentry> |
1047 | <refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum> | |
bcddd5bf JSJ |
1048 | </citerefentry> |
1049 | </para> | |
63749b1a KS |
1050 | </refsect1> |
1051 | </refentry> |