[PATCH] hmm, handle net devices with udev?

Hmm, Arndt Bergmann sent a patch like this one a few weeks ago and
I want to bring the question back, if we want to handle net device
naming with udev.

With this patch it is actually possible to specify something like this
in udev.rules:

  KERNEL="dummy*", SYSFS{address}="00:00:00:00:00:00", SYSFS{features}="0x0", NAME="blind%n"
  KERNEL="eth*", SYSFS{address}="00:0d:60:77:30:91", NAME="private"

and you will get:

  [root@pim udev.kay]# cat /proc/net/dev
  Inter-|   Receive                                                | Transmit
   face |bytes    packets errs drop fifo frame compressed multicast|bytes   packets errs drop fifo colls carrier compressed
       lo:    1500     30    0    0    0     0          0         0    1500      30    0    0    0     0       0          0
  private:  278393   1114    0    0    0     0          0         0  153204    1468    0    0    0     0       0          0
     sit0:       0      0    0    0    0     0          0         0       0       0    0    0    0     0       0          0
   blind0:       0      0    0    0    0     0          0         0       0       0    0    0    0     0       0          0


The udevinfo program is also working:

  [root@pim udev.kay]# ./udevinfo -a -p /sys/class/net/private
    looking at class device '/sys/class/net/private':
      SYSFS{addr_len}="6"
      SYSFS{address}="00:0d:60:77:30:91"
      SYSFS{broadcast}="ff:ff:ff:ff:ff:ff"
      SYSFS{features}="0x3a9"
      SYSFS{flags}="0x1003"
      SYSFS{ifindex}="2"
      SYSFS{iflink}="2"
      SYSFS{mtu}="1500"
      SYSFS{tx_queue_len}="1000"
      SYSFS{type}="1"

  follow the class device's "device"
    looking at the device chain at '/sys/devices/pci0000:00/0000:00:1e.0/0000:02:01.0':
      BUS="pci"
      ID="0000:02:01.0"
      SYSFS{class}="0x020000"
      SYSFS{detach_state}="0"
      SYSFS{device}="0x101e"
      SYSFS{irq}="11"
      SYSFS{subsystem_device}="0x0549"
      SYSFS{subsystem_vendor}="0x1014"
      SYSFS{vendor}="0x8086"


The matching device will be renamed to the given name. The device name
will not be put into the udev database, cause the kernel renames the
device and the sysfs name disappears.

I like it, cause it plugs in nicely. We have all the naming features
and sysfs queries and walks inside of  udev. The sysfs timing races
are already solved and the management tools are working for net devices
too. nameif can only match the MAC address now. udev can match any sysfs
value of the device tree the net device is connected to.
But right, net devices do not have device nodes :)

8 files changed, 207 insertions, 108 deletions

diff --git a/namedev.c b/namedev.c
index b9d8a3db2c..f2aea34719 100644
--- a/namedev.c
+++ b/namedev.c
@@ -836,12 +836,22 @@ int namedev_name_device(struct sysfs_class_device *class_dev, struct udevice *ud
 		}
 	}
 
+	/* no rule was found for the net device */
+	if (udev->type == 'n') {
+		dbg("no name for net device '%s' configured", udev->kernel_name);
+		return -1;
+	}
+
 	/* no rule was found so we use the kernel name */
 	strfieldcpy(udev->name, udev->kernel_name);
 	goto done;
 
 found:
 	apply_format(udev, udev->name, sizeof(udev->name), class_dev, sysfs_device);
+
+	if (udev->type == 'n')
+		return 0;
+
 	udev->partitions = dev->partitions;
 	strfieldcpy(udev->config_file, dev->config_file);
 	udev->config_line = dev->config_line;
diff --git a/test/udev-test.pl b/test/udev-test.pl
index d93ebb9cc3..8ae01c31d4 100644
--- a/test/udev-test.pl
+++ b/test/udev-test.pl
@@ -35,7 +35,7 @@ my @tests = (
 	{
 		desc		=> "label test of scsi disc",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "boot_disk" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="boot_disk%n"
@@ -45,7 +45,7 @@ EOF
 	{
 		desc		=> "label test of scsi partition",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda1",
+		devpath		=> "/block/sda/sda1",
 		exp_name	=> "boot_disk1" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="boot_disk%n"
@@ -54,7 +54,7 @@ EOF
 	{
 		desc		=> "label test of pattern match",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda1",
+		devpath		=> "/block/sda/sda1",
 		exp_name	=> "boot_disk1" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="?IBM-ESXS", NAME="boot_disk%n-1"
@@ -66,7 +66,7 @@ EOF
 	{
 		desc		=> "label test of multiple sysfs files",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda1",
+		devpath		=> "/block/sda/sda1",
 		exp_name	=> "boot_disk1" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", SYSFS{model}="ST336605LW   !#", NAME="boot_diskX%n"
@@ -76,7 +76,7 @@ EOF
 	{
 		desc		=> "label test of max sysfs files",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda1",
+		devpath		=> "/block/sda/sda1",
 		exp_name	=> "boot_disk1" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", SYSFS{model}="ST336605LW    !#", SYSFS{scsi_level}="4", SYSFS{rev}="B245", SYSFS{type}="2", SYSFS{queue_depth}="32", NAME="boot_diskXX%n"
@@ -86,7 +86,7 @@ EOF
 	{
 		desc		=> "catch device by *",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor/0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB*", NAME="visor/%n"
@@ -95,7 +95,7 @@ EOF
 	{
 		desc		=> "catch device by * - take 2",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor/0" ,
 		conf		=> <<EOF
 KERNEL="*USB1", NAME="bad"
@@ -105,7 +105,7 @@ EOF
 	{
 		desc		=> "catch device by ?",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor/0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB??*", NAME="visor/%n-1"
@@ -116,7 +116,7 @@ EOF
 	{
 		desc		=> "catch device by character class",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor/0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB[A-Z]*", NAME="visor/%n-1"
@@ -127,7 +127,7 @@ EOF
 	{
 		desc		=> "replace kernel name",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB0", NAME="visor"
@@ -136,7 +136,7 @@ EOF
 	{
 		desc		=> "Handle comment lines in config file (and replace kernel name)",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor" ,
 		conf		=> <<EOF
 # this is a comment
@@ -147,7 +147,7 @@ EOF
 	{
 		desc		=> "Handle comment lines in config file with whitespace (and replace kernel name)",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor" ,
 		conf		=> <<EOF
  # this is a comment with whitespace before the comment 
@@ -158,7 +158,7 @@ EOF
 	{
 		desc		=> "Handle empty lines in config file (and replace kernel name)",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor" ,
 		conf		=> <<EOF
 
@@ -169,7 +169,7 @@ EOF
 	{
 		desc		=> "subdirectory handling",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "sub/direct/ory/visor" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB0", NAME="sub/direct/ory/visor"
@@ -178,7 +178,7 @@ EOF
 	{
 		desc		=> "place on bus of scsi partition",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "first_disk3" ,
 		conf		=> <<EOF
 BUS="scsi", PLACE="0:0:0:0", NAME="first_disk%n"
@@ -187,7 +187,7 @@ EOF
 	{
 		desc		=> "test NAME substitution chars",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "Major:8:minor:3:kernelnumber:3:bus:0:0:0:0" ,
 		conf		=> <<EOF
 BUS="scsi", PLACE="0:0:0:0", NAME="Major:%M:minor:%m:kernelnumber:%n:bus:%b"
@@ -196,7 +196,7 @@ EOF
 	{
 		desc		=> "test NAME substitution chars (with length limit)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "M8-m3-n3-b0:0-sIBM" ,
 		conf		=> <<EOF
 BUS="scsi", PLACE="0:0:0:0", NAME="M%M-m%m-n%n-b%3b-s%3s{vendor}"
@@ -205,7 +205,7 @@ EOF
 	{
 		desc		=> "old style SYSFS_ attribute",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "good" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS_vendor="IBM-ESXS", NAME="good"
@@ -214,7 +214,7 @@ EOF
 	{
 		desc		=> "sustitution of sysfs value (%s{file})",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "disk-IBM-ESXS-sda" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="disk-%s{vendor}-%k"
@@ -224,7 +224,7 @@ EOF
 	{
 		desc		=> "program result substitution",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "special-device-3" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n special-device", RESULT="-special-*", NAME="%c-1-%n"
@@ -237,7 +237,7 @@ EOF
 	{
 		desc		=> "program result substitution",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "test-0:0:0:0" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n test-%b", RESULT="test-0:0*", NAME="%c"
@@ -246,7 +246,7 @@ EOF
 	{
 		desc		=> "program with escaped format char (tricky: callout returns format char!)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "escape-3" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n escape-%%n", KERNEL="sda3", NAME="%c"
@@ -255,7 +255,7 @@ EOF
 	{
 		desc		=> "program with lots of arguments",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "foo9" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n foo3 foo4 foo5 foo6 foo7 foo8 foo9", KERNEL="sda3", NAME="%c{7}"
@@ -264,7 +264,7 @@ EOF
 	{
 		desc		=> "program with subshell",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "bar9" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/sh -c 'echo foo3 foo4 foo5 foo6 foo7 foo8 foo9 | sed  s/foo9/bar9/'", KERNEL="sda3", NAME="%c{7}"
@@ -273,7 +273,7 @@ EOF
 	{
 		desc		=> "program arguments combined with apostrophes",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "foo7" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n 'foo3 foo4'   'foo5   foo6   foo7 foo8'", KERNEL="sda3", NAME="%c{5}"
@@ -282,7 +282,7 @@ EOF
 	{
 		desc		=> "characters before the %c{N} substitution",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "my-foo9" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n foo3 foo4 foo5 foo6 foo7 foo8 foo9", KERNEL="sda3", NAME="my-%c{7}"
@@ -291,7 +291,7 @@ EOF
 	{
 		desc		=> "substitute the second to last argument",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "my-foo8" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n foo3 foo4 foo5 foo6 foo7 foo8 foo9", KERNEL="sda3", NAME="my-%c{6}"
@@ -300,7 +300,7 @@ EOF
 	{
 		desc		=> "program result substitution (numbered part of)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "link1" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n node link1 link2", RESULT="node *", NAME="%c{1}", SYMLINK="%c{2} %c{3}"
@@ -309,7 +309,7 @@ EOF
 	{
 		desc		=> "program result substitution (numbered part of+)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda3",
+		devpath		=> "/block/sda/sda3",
 		exp_name	=> "link3" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n node link1 link2 link3 link4", RESULT="node *", NAME="%c{1}", SYMLINK="%c{2+}"
@@ -318,7 +318,7 @@ EOF
 	{
 		desc		=> "invalid program for device with no bus",
 		subsys		=> "tty",
-		devpath		=> "class/tty/console",
+		devpath		=> "/class/tty/console",
 		exp_name	=> "TTY" ,
 		conf		=> <<EOF
 BUS="scsi", PROGRAM="/bin/echo -n foo", RESULT="foo", NAME="foo"
@@ -328,7 +328,7 @@ EOF
 	{
 		desc		=> "valid program for device with no bus",
 		subsys		=> "tty",
-		devpath		=> "class/tty/console",
+		devpath		=> "/class/tty/console",
 		exp_name	=> "foo" ,
 		conf		=> <<EOF
 PROGRAM="/bin/echo -n foo", RESULT="foo", NAME="foo"
@@ -338,7 +338,7 @@ EOF
 	{
 		desc		=> "invalid label for device with no bus",
 		subsys		=> "tty",
-		devpath		=> "class/tty/console",
+		devpath		=> "/class/tty/console",
 		exp_name	=> "TTY" ,
 		conf		=> <<EOF
 BUS="foo", SYSFS{dev}="5:1", NAME="foo"
@@ -348,7 +348,7 @@ EOF
 	{
 		desc		=> "valid label for device with no bus",
 		subsys		=> "tty",
-		devpath		=> "class/tty/console",
+		devpath		=> "/class/tty/console",
 		exp_name	=> "foo" ,
 		conf		=> <<EOF
 SYSFS{dev}="5:1", NAME="foo"
@@ -358,7 +358,7 @@ EOF
 	{
 		desc		=> "program and bus type match",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "scsi-0:0:0:0" ,
 		conf		=> <<EOF
 BUS="usb", PROGRAM="/bin/echo -n usb-%b", NAME="%c"
@@ -369,7 +369,7 @@ EOF
 	{
 		desc		=> "symlink creation (same directory)",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB[0-9]*", NAME="ttyUSB%n", SYMLINK="visor%n"
@@ -378,7 +378,7 @@ EOF
 	{
 		desc		=> "symlink creation (relative link back)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda2",
+		devpath		=> "/block/sda/sda2",
 		exp_name	=> "1/2/a/b/symlink" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="1/2/node", SYMLINK="1/2/a/b/symlink"
@@ -387,7 +387,7 @@ EOF
 	{
 		desc		=> "symlink creation (relative link forward)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda2",
+		devpath		=> "/block/sda/sda2",
 		exp_name	=> "1/2/symlink" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="1/2/a/b/node", SYMLINK="1/2/symlink"
@@ -396,7 +396,7 @@ EOF
 	{
 		desc		=> "symlink creation (relative link back and forward)",
 		subsys		=> "block",
-		devpath		=> "block/sda/sda2",
+		devpath		=> "/block/sda/sda2",
 		exp_name	=> "1/2/c/d/symlink" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME="1/2/a/b/node", SYMLINK="1/2/c/d/symlink"
@@ -405,7 +405,7 @@ EOF
 	{
 		desc		=> "multiple symlinks",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "second-0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB0", NAME="visor", SYMLINK="first-%n second-%n third-%n"
@@ -414,7 +414,7 @@ EOF
 	{
 		desc		=> "create all possible partitions",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "boot_disk15" ,
 		conf		=> <<EOF
 BUS="scsi", SYSFS{vendor}="IBM-ESXS", NAME{all_partitions}="boot_disk"
@@ -423,7 +423,7 @@ EOF
 	{
 		desc		=> "sysfs parent hierarchy",
 		subsys		=> "tty",
-		devpath		=> "class/tty/ttyUSB0",
+		devpath		=> "/class/tty/ttyUSB0",
 		exp_name	=> "visor" ,
 		conf		=> <<EOF
 SYSFS{idProduct}="2008", NAME="visor"
@@ -432,7 +432,7 @@ EOF
 	{
 		desc		=> "name test with ! in the name",
 		subsys		=> "block",
-		devpath		=> "block/rd!c0d0",
+		devpath		=> "/block/rd!c0d0",
 		exp_name	=> "rd/c0d0" ,
 		conf		=> <<EOF
 BUS="scsi", NAME="%k"
@@ -442,7 +442,7 @@ EOF
 	{
 		desc		=> "name test with ! in the name, but no matching rule",
 		subsys		=> "block",
-		devpath		=> "block/rd!c0d0",
+		devpath		=> "/block/rd!c0d0",
 		exp_name	=> "rd/c0d0" ,
 		conf		=> <<EOF
 KERNEL="ttyUSB0", NAME="visor"
@@ -451,7 +451,7 @@ EOF
 	{
 		desc		=> "ID rule",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "scsi-0:0:0:0",
 		conf		=> <<EOF
 BUS="usb", ID="0:0:0:0", NAME="not-scsi"
@@ -464,7 +464,7 @@ EOF
 	{
 		desc		=> "ID wildcard all",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "scsi-0:0:0:0",
 		conf		=> <<EOF
 BUS="scsi", ID="*:1", NAME="no-match"
@@ -477,7 +477,7 @@ EOF
 	{
 		desc		=> "ID wildcard partial",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "scsi-0:0:0:0",
 		conf		=> <<EOF
 BUS="scsi", ID="*:0", NAME="scsi-0:0:0:0"
@@ -487,7 +487,7 @@ EOF
 	{
 		desc		=> "ID wildcard partial 2",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "scsi-0:0:0:0",
 		conf		=> <<EOF
 BUS="scsi", ID="*:0:0:0", NAME="scsi-0:0:0:0"
@@ -497,7 +497,7 @@ EOF
 	{
 		desc		=> "ignore SYSFS attribute whitespace",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "ignored",
 		conf		=> <<EOF
 BUS="scsi", SYSFS{whitespace_test}="WHITE  SPACE", NAME="ignored"
@@ -506,7 +506,7 @@ EOF
 	{
 		desc		=> "do not ignore SYSFS attribute whitespace",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "matched-with-space",
 		conf		=> <<EOF
 BUS="scsi", SYSFS{whitespace_test}="WHITE  SPACE ", NAME="wrong-to-ignore"
@@ -516,7 +516,7 @@ EOF
 	{
 		desc		=> "SYMLINK only rule",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "symlink-only2",
 		conf		=> <<EOF
 BUS="scsi", KERNEL="sda", SYMLINK="symlink-only1"
@@ -527,7 +527,7 @@ EOF
 	{
 		desc		=> "permissions test",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "node",
 		exp_perms	=> "5000::0444",
 		conf		=> <<EOF
@@ -537,7 +537,7 @@ EOF
 	{
 		desc		=> "major/minor number test",
 		subsys		=> "block",
-		devpath		=> "block/sda",
+		devpath		=> "/block/sda",
 		exp_name	=> "node",
 		exp_majorminor	=> "8:0",
 		conf		=> <<EOF
@@ -547,7 +547,7 @@ EOF
 	{
 		desc		=> "big minor number test",
 		subsys		=> "i2c-dev",
-		devpath		=> "class/i2c-dev/i2c-300",
+		devpath		=> "/class/i2c-dev/i2c-300",
 		exp_name	=> "node",
 		exp_majorminor	=> "89:300",
 		conf		=> <<EOF
@@ -557,7 +557,7 @@ EOF
 	{
 		desc		=> "big major number test",
 		subsys		=> "i2c-dev",
-		devpath		=> "class/i2c-dev/i2c-fake1",
+		devpath		=> "/class/i2c-dev/i2c-fake1",
 		exp_name	=> "node",
 		exp_majorminor	=> "4095:1",
 		conf		=> <<EOF
@@ -567,7 +567,7 @@ EOF
 	{
 		desc		=> "big major and big minor number test",
 		subsys		=> "i2c-dev",
-		devpath		=> "class/i2c-dev/i2c-fake2",
+		devpath		=> "/class/i2c-dev/i2c-fake2",
 		exp_name	=> "node",
 		exp_majorminor	=> "4094:89999",
 		conf		=> <<EOF
diff --git a/udev-add.c b/udev-add.c
index aef755442f..4aff06e15f 100644
--- a/udev-add.c
+++ b/udev-add.c
@@ -30,6 +30,10 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <grp.h>
+#include <net/if.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <linux/sockios.h>
 #ifndef __KLIBC__
 #include <pwd.h>
 #include <utmp.h>
@@ -342,16 +346,16 @@ exit:
 /* wait for the "dev" file to show up in the directory in sysfs.
  * If it doesn't happen in about 10 seconds, give up.
  */
-#define SECONDS_TO_WAIT_FOR_DEV		10
-static int sleep_for_dev(char *path)
+#define SECONDS_TO_WAIT_FOR_FILE	10
+static int sleep_for_file(char *path, char* file)
 {
 	char filename[SYSFS_PATH_MAX + 6];
-	int loop = SECONDS_TO_WAIT_FOR_DEV;
+	int loop = SECONDS_TO_WAIT_FOR_FILE;
 	int retval;
 
 	strfieldcpy(filename, sysfs_path);
 	strfieldcat(filename, path);
-	strfieldcat(filename, "/dev");
+	strfieldcat(filename, file);
 
 	while (loop--) {
 		struct stat buf;
@@ -369,6 +373,30 @@ exit:
 	return retval;
 }
 
+static int rename_net_if(struct udevice *dev)
+{
+	int sk;
+	struct ifreq ifr;
+	int retval;
+
+	sk = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sk < 0) {
+		dbg("error opening socket");
+		return -1;
+	}
+
+	memset(&ifr, 0x00, sizeof(struct ifreq));
+	strfieldcpy(ifr.ifr_name, dev->kernel_name);
+	strfieldcpy(ifr.ifr_newname, dev->name);
+
+	dbg("changing net interface name from '%s' to '%s'", dev->kernel_name, dev->name);
+	retval = ioctl(sk, SIOCSIFNAME, &ifr);
+	if (retval != 0)
+		dbg("error changing net interface name");
+
+	return retval;
+}
+
 int udev_add_device(char *path, char *subsystem, int fake)
 {
 	struct sysfs_class_device *class_dev = NULL;
@@ -378,39 +406,61 @@ int udev_add_device(char *path, char *subsystem, int fake)
 	memset(&dev, 0x00, sizeof(dev));
 
 	/* for now, the block layer is the only place where block devices are */
-	if (strcmp(subsystem, "block") == 0)
-		dev.type = 'b';
-	else
-		dev.type = 'c';
 
-	retval = sleep_for_dev(path);
-	if (retval != 0)
-		goto exit;
+	dev.type = get_device_type(path, subsystem);
+
+	switch (dev.type) {
+	case 'b':
+	case 'c':
+		retval = sleep_for_file(path, "/dev");
+		break;
+
+	case 'n':
+		retval = sleep_for_file(path, "/address");
+		break;
+
+	default:
+		dbg("unknown device type '%c'", dev.type);
+		retval = -EINVAL;
+	}
 
 	class_dev = get_class_dev(path);
 	if (class_dev == NULL)
 		goto exit;
 
-	retval = get_major_minor(class_dev, &dev);
-	if (retval != 0) {
-		dbg("get_major_minor failed");
-		goto exit;
+	if (dev.type == 'b' || dev.type == 'c') {
+		retval = get_major_minor(class_dev, &dev);
+		if (retval != 0) {
+			dbg("get_major_minor failed");
+			goto exit;
+		}
 	}
 
 	retval = namedev_name_device(class_dev, &dev);
 	if (retval != 0)
 		goto exit;
 
-	if (!fake) {
+	if (!fake && (dev.type == 'b' || dev.type == 'c')) {
 		retval = udevdb_add_dev(path, &dev);
 		if (retval != 0)
 			dbg("udevdb_add_dev failed, but we are going to try "
 			    "to create the node anyway. But remove might not "
 			    "work properly for this device.");
-
 	}
+
 	dbg("name='%s'", dev.name);
-	retval = create_node(&dev, fake);
+	switch (dev.type) {
+	case 'b':
+	case 'c':
+		retval = create_node(&dev, fake);
+		break;
+
+	case 'n':
+		retval = rename_net_if(&dev);
+		if (retval != 0)
+			dbg("net device naming failed");
+		break;
+	}
 
 	if ((retval == 0) && (!fake))
 		dev_d_send(&dev, subsystem);
diff --git a/udev-remove.c b/udev-remove.c
index 41636b684e..98c45d6c33 100644
--- a/udev-remove.c
+++ b/udev-remove.c
@@ -135,22 +135,38 @@ int udev_remove_device(char *path, char *subsystem)
 	char *temp;
 	int retval;
 
-	memset(&dev, 0, sizeof(dev));
+	memset(&dev, 0x00, sizeof(dev));
 
-	retval = udevdb_get_dev(path, &dev);
-	if (retval) {
-		dbg("'%s' not found in database, falling back on default name", path);
-		temp = strrchr(path, '/');
-		if (temp == NULL)
-			return -ENODEV;
-		strfieldcpy(dev.name, &temp[1]);
-	}
+	dev.type = get_device_type(path, subsystem);
+
+	switch (dev.type) {
+	case 'b':
+	case 'c':
+		retval = udevdb_get_dev(path, &dev);
+		if (retval) {
+			dbg("'%s' not found in database, falling back on default name", path);
+			temp = strrchr(path, '/');
+			if (temp == NULL)
+				return -ENODEV;
+			strfieldcpy(dev.name, &temp[1]);
+		}
 
-	dbg("name is '%s'", dev.name);
-	udevdb_delete_dev(path);
+		dbg("name='%s'", dev.name);
+		udevdb_delete_dev(path);
 
-	dev_d_send(&dev, subsystem);
+		dev_d_send(&dev, subsystem);
+
+		retval = delete_node(&dev);
+		break;
+
+	case 'n':
+		retval = 0;
+		break;
+
+	default:
+		dbg("unknown device type '%c'", dev.type);
+		retval = -EINVAL;
+	}
 
-	retval = delete_node(&dev);
 	return retval;
 }
diff --git a/udev.c b/udev.c
index 52b98c8d45..192bed97d8 100644
--- a/udev.c
+++ b/udev.c
@@ -68,7 +68,6 @@ static void sig_handler(int signum)
 }
 
 static char *subsystem_blacklist[] = {
-	"net",
 	"scsi_host",
 	"scsi_device",
 	"usb_host",
@@ -85,6 +84,7 @@ static int udev_hotplug(void)
 	int retval = -EINVAL;
 	int i;
 	struct sigaction act;
+	const int nofake = 0;
 
 	action = get_action();
 	if (!action) {
@@ -137,23 +137,23 @@ static int udev_hotplug(void)
 
 	if (strcmp(action, "add") == 0) {
 		namedev_init();
-		retval = udev_add_device(devpath, subsystem, 0);
-	} else {
-		if (strcmp(action, "remove") == 0) {
-			retval = udev_remove_device(devpath, subsystem);
-		} else {
-			dbg("unknown action '%s'", action);
-			retval = -EINVAL;
-		}
+		retval = udev_add_device(devpath, subsystem, nofake);
+		goto action_done;
+	}
+
+	if (strcmp(action, "remove") == 0) {
+		retval = udev_remove_device(devpath, subsystem);
+		goto action_done;
 	}
 
+	dbg("unknown action '%s'", action);
+	retval = -EINVAL;
+
+action_done:
 	udevdb_exit();
 
 exit:
-	if (retval > 0)
-		retval = 0;
-
-	return -retval;
+	return retval;
 }
 
 int main(int argc, char *argv[], char *envp[])
diff --git a/udev_lib.c b/udev_lib.c
index f095513c97..4a9eea506c 100644
--- a/udev_lib.c
+++ b/udev_lib.c
@@ -81,6 +81,22 @@ char *get_subsystem(char *subsystem)
 	return subsystem;
 }
 
+char get_device_type(const char *path, const char *subsystem)
+{
+	if (strcmp(subsystem, "block") == 0 ||
+	    strstr(path, "/block/") != NULL)
+		return 'b';
+
+	if (strcmp(subsystem, "net") == 0 ||
+	    strstr(path, "/class/net/") != NULL)
+		return 'n';
+
+	if (strstr(path, "/class/") != NULL)
+		return 'c';
+
+	return '\0';
+}
+
 int file_map(const char *filename, char **buf, size_t *bufsize)
 {
 	struct stat stats;
diff --git a/udev_lib.h b/udev_lib.h
index 5db6b5261a..90a42ffe96 100644
--- a/udev_lib.h
+++ b/udev_lib.h
@@ -71,6 +71,7 @@ extern char *get_devpath(void);
 extern char *get_devnode(void);
 extern char *get_seqnum(void);
 extern char *get_subsystem(char *subsystem);
+extern char get_device_type(const char *path, const char *subsystem);
 extern int file_map(const char *filename, char **buf, size_t *bufsize);
 extern void file_unmap(char *buf, size_t bufsize);
 extern size_t buf_get_line(char *buf, size_t buflen, size_t cur);
diff --git a/udevinfo.c b/udevinfo.c
index 800882eb1a..b23f9d0aef 100644
--- a/udevinfo.c
+++ b/udevinfo.c
@@ -138,6 +138,10 @@ static int print_device_chain(const char *path)
 	struct sysfs_device *sysfs_dev;
 	struct sysfs_device *sysfs_dev_parent;
 	int retval = 0;
+	char type;
+
+	type = get_device_type(path, "");
+	dbg("device type is %c", type);
 
 	/*  get the class dev */
 	class_dev = sysfs_open_class_device_path(path);
@@ -146,21 +150,23 @@ static int print_device_chain(const char *path)
 		return -1;
 	}
 
-	/* read the 'dev' file for major/minor*/
-	attr = sysfs_get_classdev_attr(class_dev, "dev");
-	if (attr == NULL) {
-		printf("couldn't get the \"dev\" file\n");
-		retval = -1;
-		goto exit;
-	}
-
 	printf("\nudevinfo starts with the device the node belongs to and then walks up the\n"
 	       "device chain, to print for every device found, all possibly useful attributes\n"
 	       "in the udev key format.\n"
 	       "Only attributes within one device section may be used together in one rule,\n"
 	       "to match the device for which the node will be created.\n"
 	       "\n");
-	printf("device '%s' has major:minor %s", class_dev->path, attr->value);
+
+	if (type == 'b' || type =='c') {
+		/* read the 'dev' file for major/minor*/
+		attr = sysfs_get_classdev_attr(class_dev, "dev");
+		if (attr == NULL) {
+			printf("couldn't get the \"dev\" file\n");
+			retval = -1;
+			goto exit;
+		}
+		printf("device '%s' has major:minor %s", class_dev->path, attr->value);
+	}
 
 	/* open sysfs class device directory and print all attributes */
 	printf("  looking at class device '%s':\n", class_dev->path);