[Bug 1593379] Re: systemd 229-4ubuntu6 ignores net.ifnames=0 on USB or /etc/udev/rules.d/80-net-setup-link.rules being a /dev/null symlink

Fri Aug 5 00:31:28 UTC 2016

I might be doing something broken, but it still seems broken to me on
Ubuntu 16.04 on Raspberry PI despite having these fixes applied.

Package versions:
systemd: 229-4ubuntu7
udev: 229-4ubuntu7

Could you please take a look if I'm not doing something stupid (I
hopefully attached the relevant info):

$ ifconfig -a | head
enxb827eb739cc2 Link encap:Ethernet  HWaddr b8:27:eb:73:9c:c2  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host

$ ls -l /etc/udev/rules.d/80-net-setup-link.rules | tee -a report.txt 
lrwxrwxrwx 1 root root 9 Aug  4  2016 /etc/udev/rules.d/80-net-setup-link.rules -> /dev/null

$ grep net.ifnames=0 /proc/cmdline | tee -a report.txt
8250.nr_uarts=1 dma.dmachans=0x7f35 bcm2708_fb.fbwidth=1824 bcm2708_fb.fbheight=984 bcm2709.boardrev=0xa02082 bcm2709.serial=0xb2739cc2 smsc95xx.macaddr=B8:27:EB:73:9C:C2 bcm2708_fb.fbswap=1 bcm2709.uart_clock=48000000 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000  fsck.mode=force net.ifnames=0 dwc_otg.lpm_enable=0 console=ttyS0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

$ cat /lib/udev/rules.d/73-usb-net-by-mac.rules
# Use MAC based names for network interfaces which are directly or indirectly
# on USB and have an universally administered (stable) MAC address (second bit 
# is 0). 

IMPORT{cmdline}="net.ifnames", ENV{net.ifnames}=="0", GOTO="usb_net_by_mac_end"
PROGRAM="/bin/readlink /etc/udev/rules.d/80-net-setup-link.rules", RESULT=="/dev/null", GOTO="usb_net_by_mac_end"

ACTION=="add", SUBSYSTEM=="net", SUBSYSTEMS=="usb", NAME=="", \
    ATTR{address}=="?[014589cd]:*", \
    IMPORT{builtin}="net_id", NAME="$env{ID_NET_NAME_MAC}"

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Title:
  systemd 229-4ubuntu6 ignores net.ifnames=0 on USB or
  /etc/udev/rules.d/80-net-setup-link.rules being a /dev/null symlink

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  In Progress
Status in systemd package in Debian:
  Fix Released

Bug description:
  Description:    Ubuntu 16.04 LTS
  Release:        16.04

  The upgrade to systemd/udev 229-4ubuntu6 breaks net.ifnames=0 for USB
  devices.

  It appears the regression is here:
  * Set MAC based name for USB network interfaces only for universally
      administered (i. e. stable) MACs, not for locally administered (i. e.
      randomly generated) ones. Drop /lib/systemd/network/90-mac-for-usb.link
      (as link files don't currently support globs for MACAddress=) and replace
      with an udev rule in /lib/udev/rules.d/73-special-net-names.rules.
      (Closes: #812575, LP: #1574483)

  As Raspberry Pi's use eth0 via USB, this breaks running systems.

  Before:
  ii  systemd        229-4ubuntu4 armhf        system and service manager
  ii  udev           229-4ubuntu4 armhf        /dev/ and hotplug management daem

  3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
      link/ether b8:27:eb:16:39:e9 brd ff:ff:ff:ff:ff:ff

  After:

  ii  systemd                      229-4ubuntu6        armhf               system and service manager
  ii  udev                         229-4ubuntu6        armhf               /dev/ and hotplug management daemon

  3: enxb827eb1639e9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
      link/ether b8:27:eb:16:39:e9 brd ff:ff:ff:ff:ff:ff

  cat /proc/cmdline
  dma.dmachans=0x7f35 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2709.boardrev=0xa01041 bcm2709.serial=0x37b38253 smsc95xx.macaddr=B8:27:EB:B3:82:53 bcm2708_fb.fbswap=1 bcm2709.disk_led_gpio=47 bcm2709.disk_led_active_low=0 sdhci-bcm2708.emmc_clock_freq=250000000 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000  net.ifnames=0 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

  With the default interfaces configuration, all networking is lost on
  reboot after upgrade.

  SRU TEST CASE
  =============
   * Boot with "net.ifnames=0" on the kernel command line, and connect an USB ethernet device. It will still be called enxDEADBEEF with current xenial. With the -proposed version it will instead keep the kernel name, like "usb0" as intended.

   * Do "sudo ln -s /dev/null /etc/udev/rules.d/80-net-setup-link.rules"
  (the other documented way to disable ifnames) and do the above
  connect/name check test again.

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