path: root/net/bonding.sh

# Copyright (c) 2007-2008 Roy Marples <roy@marples.name>
#               2017      Marc Schiffbauer <mschiff@gentoo.org>
# Released under the 2-clause BSD license.
# shellcheck shell=sh disable=SC1008

bonding_depend()
{
	before interface macchanger
	program ip ifconfig
	# If you do not have sysfs, you MUST have this binary instead for ioctl
	# Also you will lose some functionality that cannot be done via sysfs:
	if [ ! -d /sys/class/net ]; then
		program ifenslave
	fi

	local netns
	eval netns="\$netns_${IFVAR}"
	[ -n "${netns}" ] && program ip
	return 0
}

_config_vars="$_config_vars slaves"

_is_bond()
{
	_netns [ -f "/proc/net/bonding/${IFACE}" ]
}

bonding_pre_start()
{
	local x= s= n= i= slaves= primary=

	slaves="$(_get_array "slaves_${IFVAR}")"
	unset slaves_${IFVAR}

	eval primary="\$primary_${IFVAR}"
	unset primary_${IFVAR}

	eval subsume="\$subsume_${IFVAR}"
	unset subsume_${IFVAR}


	[ -z "${slaves}" ] && return 0

	# Load the kernel module if required
	if [ ! -d /proc/net/bonding ]; then
		if ! modprobe bonding; then
			eerror "Cannot load the bonding module"
			return 1
		fi
	fi

	if [ ! -d /sys/class/net ]; then
		ewarn "sysfs is not available! You will be unable to create new bonds, or change dynamic parameters!"
	fi

	# We can create the interface name we like now, but this
	# requires sysfs
	if ! _exists && [ -d /sys/class/net ]; then
		_netns echo "+${IFACE}" \> /sys/class/net/bonding_masters
	fi
	_exists true || return 1

	if ! _is_bond; then
		eerror "${IFACE} is not capable of bonding"
		return 1
	fi

	# Interface must be down in order to configure
	_down

	# Configure the bond mode & link monitoring, then we can reloop to ensure
	# we configure all other options
	# mode needs to be done before all other options.
	# miimon needs to be done BEFORE downdelay
	_netns [ -d /sys/class/net ] && for n in mode miimon; do
		x=/sys/class/net/"${IFACE}"/bonding/$n
		_netns [ -f "${x}" ] || continue
		eval s=\$${n}_${IFVAR}
		if [ -n "${s}" ]; then
			einfo "Setting ${n}: ${s}"
			_netns echo "${s}" \>"${x}" || \
			eerror "Failed to configure $n (${n}_${IFVAR})"
		fi
	done
	# Configure arp ip targets, they need to be added one after another
	# With a leading '+' as a prefix.
	n=arp_ip_target
	x=/sys/class/net/"${IFACE}"/bonding/$n
	_netns [ -d /sys/class/net ] && if _netns [ -f "$x" ]; then
		eval s=\$${n}_${IFVAR}
		if [ -n "${s}" ]; then
			for i in $s; do
				einfo "Adding ${n}: ${i}"
				_netns echo "+${i#+}" \>"${x}" || \
				eerror "Failed to add $i (${n}_${IFVAR})"
			done
		fi
	fi
	# Nice and dynamic for remaining options:)
	_netns [ -d /sys/class/net ] && for x in $(_netns glob /sys/class/net/"${IFACE}"/bonding/\*); do
		_netns [ -f "${x}" ] || continue
		n=${x##*/}
		# These entries are already handled above.
		case "$n" in
			mode) continue ;;
			miimon) continue ;;
			arp_ip_target) continue ;;
		esac
		# Check if anything to do.
		eval s=\$${n}_${IFVAR}
		if [ -n "${s}" ]; then
			einfo "Setting ${n}: ${s}"
			_netns echo "${s}" \>"${x}" || \
			eerror "Failed to configure $n (${n}_${IFVAR})"
		fi
	done

	ebegin "Adding slaves to ${IFACE}"
	eindent
	einfo "${slaves}"

	# Check that our slaves exist
	(
	for IFACE in ${slaves}; do
		_exists true || return 1
	done

	# Unless we are subsuming an existing interface (NFS root), we down
	# slave interfaces to work around bugs supposedly in some chipsets
	# that cause failure to enslave from other states.
	if [ -z "${subsume}" ]; then
		for IFACE in ${slaves}; do
			_delete_addresses
			_down
			local disable_ipv6="/proc/sys/net/ipv6/conf/${IFACE}/disable_ipv6"
			[ -f "${disable_ipv6}" ] && printf '1\n' > "${disable_ipv6}"
		done
	fi
	)

	# Now force the master to up
	#  - First test for interface subsume request (required for NFS root)
	if [ -n "${subsume}" ]; then
		einfo "Subsuming ${subsume} interface characteristics."
		eindent
		local oiface=${IFACE}
		IFACE=${subsume}
		local addr="$(_get_inet_address)"
		einfo "address: ${addr}"
		IFACE=${oiface}
		unset oiface
		eoutdent
		# subsume (presumably kernel auto-)configured IP
		if [ -x "$(command -v ip 2>/dev/null)" ]; then
			_netns ip link set ${IFACE} up
			_netns ip address add ${addr} dev ${IFACE}
		else
			ifconfig ${IFACE} ${addr} up
		fi
	else
		# warn if root on nfs and no subsume interface supplied
		local root_fs_type=$(mountinfo -s /)
		if [ "${root_fs_type}" = "nfs" ]; then
			warn_nfs=1
			ewarn "NFS root detected!!!"
			ewarn " If your system crashes here, /etc/conf.d/net needs"
			ewarn " subsume_${IFACE}=\"<iface>\" ... where <iface> is the"
			ewarn " existing, (usually kernel auto-)configured interface."
		fi
		# up the interface
		_up
	fi

	# finally add in slaves
	# things needed in the process, and if they are done by ifenslave, openrc, and/or the kernel.
	# down new slave interface: ifenslave, openrc
	# set mtu: ifenslave, kernel
	# set slave MAC: ifenslave, kernel
	eoutdent
	if _netns [ -d /sys/class/net ]; then
		sys_bonding_path=/sys/class/net/"${IFACE}"/bonding
		local oiface
		oiface=$IFACE
		if [ -n "${primary}" ]; then
			IFACE=$primary
			_down
			IFACE=$oiface
			_netns echo "+${primary}" \> $sys_bonding_path/slaves
			_netns echo "${primary}" \> $sys_bonding_path/primary
		fi
		for s in ${slaves}; do
			[ "${s}" = "${primary}" ] && continue
			if ! _netns grep -q ${s} $sys_bonding_path/slaves; then
				IFACE=$s
				_down
				IFACE=$oiface
				_netns echo "+${s}" \> $sys_bonding_path/slaves
			fi
		done
	else
		_netns ifenslave "${IFACE}" ${slaves} >/dev/null
	fi
	eend $?

	return 0 #important
}

bonding_stop()
{
	_is_bond || return 0

	# Wipe subsumed interface
	if [ -n "${subsume}" ]; then
		if [ -x "$(command -v ip)" ]; then
			_netns ip address flush dev ${subsume}
		else
			ifconfig ${subsume} 0.0.0.0
		fi
	fi

	local slaves= s=
	slaves=$( \
		_netns sed -n -e 's/^Slave Interface: //p' "/proc/net/bonding/${IFACE}" \
		| tr '\n' ' ' \
	)
	[ -z "${slaves}" ] && return 0

	# remove all slaves
	ebegin "Removing slaves from ${IFACE}"
	eindent
	einfo "${slaves}"
	eoutdent
	if _netns [ -d /sys/class/net ]; then
		for s in ${slaves}; do
			_netns echo -"${s}" \> /sys/class/net/"${IFACE}"/bonding/slaves
		done
	else
		_netns ifenslave -d "${IFACE}" ${slaves}
	fi

	# reset all slaves
	(
	for IFACE in ${slaves}; do
		if _exists; then
			_delete_addresses
			_down
		fi
	done
	)

	_down

	if _netns [ -d /sys/class/net ]; then
		_netns echo "-${IFACE}" \> /sys/class/net/bonding_masters
	fi

	eend 0
	return 0
}