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Steven Haigh
0e7c69bd3c
Newer distros like CentOS 8 do not have brctl available. As such, we can't use it to configure networking anymore. This patch will fall back to 'ip' or 'bridge' commands if brctl is not available in the working PATH. This would be a likely backport candidate to any version expected to be built on CentOS 8 etc. Signed-off-by: Steven Haigh <netwiz@crc.id.au> Acked-by: Wei Liu <wl@xen.org>
111 lines
2.8 KiB
Bash
111 lines
2.8 KiB
Bash
#!/bin/bash
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#============================================================================
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# ${XEN_SCRIPT_DIR}/vif-bridge
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#
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# Script for configuring a vif in bridged mode.
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#
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# Usage:
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# vif-bridge (add|remove|online|offline)
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#
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# Environment vars:
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# vif vif interface name (required).
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# XENBUS_PATH path to this device's details in the XenStore (required).
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#
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# Read from the store:
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# bridge bridge to add the vif to (optional). Defaults to searching for the
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# bridge itself.
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# ip list of IP networks for the vif, space-separated (optional).
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#
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# up:
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# Enslaves the vif interface to the bridge and adds iptables rules
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# for its ip addresses (if any).
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#
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# down:
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# Removes the vif interface from the bridge and removes the iptables
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# rules for its ip addresses (if any).
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#============================================================================
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dir=$(dirname "$0")
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. "$dir/vif-common.sh"
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bridge=${bridge:-}
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bridge=$(xenstore_read_default "$XENBUS_PATH/bridge" "$bridge")
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if [ -z "$bridge" ]; then
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if which brctl >&/dev/null; then
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bridge=$(brctl show | awk 'NR==2{print$1}')
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else
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bridge=$(bridge link | cut -d" " -f7)
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fi
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if [ -z "$bridge" ]
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then
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fatal "Could not find bridge, and none was specified"
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fi
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else
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#
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# Old style bridge setup with netloop, used to have a bridge name
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# of xenbrX, enslaving pethX and vif0.X, and then configuring
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# eth0.
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#
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# New style bridge setup does not use netloop, so the bridge name
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# is ethX and the physical device is enslaved pethX
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#
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# So if...
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#
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# - User asks for xenbrX
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# - AND xenbrX doesn't exist
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# - AND there is a ethX device which is a bridge
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#
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# ..then we translate xenbrX to ethX
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#
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# This lets old config files work without modification
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#
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if [ ! -e "/sys/class/net/$bridge" ] && [ -z "${bridge##xenbr*}" ]
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then
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if [ -e "/sys/class/net/eth${bridge#xenbr}/bridge" ]
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then
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bridge="eth${bridge#xenbr}"
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fi
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fi
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fi
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RET=0
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ip link show dev "$bridge" 1>/dev/null 2>&1 || RET=1
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if [ "$RET" -eq 1 ]
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then
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fatal "Could not find bridge device $bridge"
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fi
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case "$command" in
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online)
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setup_virtual_bridge_port "$dev"
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set_mtu "$bridge" "$dev"
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add_to_bridge "$bridge" "$dev"
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;;
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offline)
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if which brctl >&/dev/null; then
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do_without_error brctl delif "$bridge" "$dev"
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else
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do_without_error ip link set "$dev" nomaster
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fi
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do_without_error ifconfig "$dev" down
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;;
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add)
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setup_virtual_bridge_port "$dev"
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set_mtu "$bridge" "$dev"
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add_to_bridge "$bridge" "$dev"
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;;
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esac
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handle_iptable
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call_hooks vif post
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log debug "Successful vif-bridge $command for $dev, bridge $bridge."
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if [ "$type_if" = vif -a "$command" = "online" ]
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then
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success
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fi
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