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authorTom Gundersen <teg@jklm.no>2013-10-26 00:34:01 +0200
committerTom Gundersen <teg@jklm.no>2013-10-26 22:09:20 +0200
commitaf6f0d422c521374ee6a2dd92df5935a5a476ae5 (patch)
treea6042b86dc3c90c97699e354946f8d3a43b4e5c4 /rules/60-persistent-storage-tape.rules
parentca5c4105733ea439f89b0199cd3f92bc2f2a0b38 (diff)
udev: add network link configuration tool
This tool applies hardware specific settings to network devices before they are announced via libudev. Settings that will probably eventually be supported are MTU, Speed, DuplexMode, WakeOnLan, MACAddress, MACAddressPolicy (e.g., 'hardware', 'synthetic' or 'random'), Name and NamePolicy (replacing our current interface naming logic). This patch only introduces support for Description, as a proof of concept. Some of these settings may later be overriden by a network management daemon/script. However, these tools should always listen and wait on libudev before touching a device (listening on netlink is not enough). This is no different from how things used to be, as we always supported changing the network interface name from udev rules, which does not work if someone has already started using it. The tool is configured by .link files in /etc/net/links/ (with the usual overriding logic in /run and /lib). The first (in lexicographical order) matching .link file is applied to a given device, and all others are ignored. The .link files contain a [Match] section with (currently) the keys MACAddress, Driver, Type (see DEVTYPE in udevadm info) and Path (this matches on the stable device path as exposed as ID_PATH, and not the unstable DEVPATH). A .link file matches a given device if all of the specified keys do. Currently the keys are treated as plain strings, but some limited globbing may later be added to the keys where it makes sense. Example: /etc/net/links/50-wireless.link [Match] MACAddress=98:f2:e4:42:c6:92 Path=pci-0000:02:00.0-bcma-0 Type=wlan [Link] Description=The wireless link
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