vnet.subr

# Network interface=related funcion, for vnet feature

init_vnet()
{
    if ! kldstat -qm if_bridge; then
	kldload if_bridge
    fi

    gw_enable
}



# $1 - nicname (eg: bridge)
# if nicname=epair we search as epairXa
# show first available nic by type
# example:
#  ttt=$( find_first_freenic bridge )
# return 1 when error
find_first_freenic()
{
    local _i _epair _A _num=0

    [ -z $1 ] && return 1
    [ "$1" = "epair" ] && _epair="a"

    for _i in $( /sbin/ifconfig -l ); do
	case "${_i}" in
	    ${1}*${_epair})
		    /sbin/ifconfig ${1}${_epair}${_num} >/dev/null 2>&1
		    [ $? -eq 1 ] && echo "${1}${_num}" && return 0
		    _num=$(( _num + 1 ))
		    [ ${_num} -gt 1000 ] && return 1
		    ;;
	esac
    done
    echo "${1}${_num}"
}

# $1 - nicname (eg: bridge)
# show nicX if exist
# example:
#   for i in $( show_all_nic_by_name bridge ); do
#      echo ${i}
#   done
show_all_nic_by_name()
{
    local _i _mynic _A _epair

    [ -z $1 ] && return 1
    [ "${1}" = "epair" ] && _epair="a" # we check only one of pair

    for _i in $(/sbin/ifconfig -l); do
	case "${_i}" in
	    ${1}*${_epair})
		echo ${_i}
		;;
	esac
    done

    [ -n "${_mynic}" ] && echo "${_mynic}"
    return 0

}

gw_enable()
{
    sysctl -qn net.inet.ip.forwarding=1 > /dev/null 2>&1
    sysctl -qn net.inet6.ip6.forwarding=1 > /dev/null 2>&1
}

# cbsd store uplink interface in description area ;)
# this func extract and show this
# $1 - iface (eg: bridge0)
# example:
#    ttt=$( get_device_uplink bridge0 )
get_device_uplink()
{
    local _desc
    [ -z "${1}" ] && return 1

    _desc=$( /sbin/ifconfig ${1} 2>/dev/null|awk '/description:/{print $2}' )
    [ -n "${_desc}" ] && echo "${_desc}"
}

# function search for available bridges in system who have uplink to ${interface}
# when not - create one
# out bridge name when it exist
# $1 - type (bridge or epair) , $2 - uplink interface
# return 1 when error
#   example:
#    if !  ttt=$( get_my_device bridge nfe0 ); then
#	echo "Error: $ttt"
#    fi
get_my_device()
{
    local _i _uplink _firstfree _ret _test _dev _desc
    [ -z "${1}" ] && echo "set device" && return 1
    [ -z "${2}" ] && echo "No uplink" && return 1
    _dev=$1
    _desc=$2

    for _i in $( show_all_nic_by_name ${_dev} ); do
	_uplink=$( get_device_uplink ${_i} )
	[ "${_uplink}" = "${_desc}" ] && echo "${_i}" && return 0
    done

    # we need for new bridge with ${_dev} uplink
    _firstfree=$( find_first_freenic ${_dev} )
    [ -z "${_firstfree}" ] && echo "Cant find first available ${_dev}" && return 1

    if [ "${_dev}" = "bridge" ]; then
	_test=$( ifconfig ${_firstfree} create addm ${_desc} up description ${_desc} 2>&1 )
	_ret=$?
	[ ${_ret} -ne 0 ] && echo "${_test}" && return 1
    fi
	echo "${_firstfree}"
}

# create epair and switch epairXa to bridge $1
# out of created epair
get_my_epair()
{
    local _firstfree

    [ -z "${1}" ] && echo "No bridge" && return 1

    _firstfree=$( find_first_freenic epair )

    [ $? -eq 1 ] && echo "No free available epair" && return 1

    ifconfig ${_firstfree} create >/dev/null 2>/dev/null
    ifconfig ${1} addm ${_firstfree}a
    ifconfig ${_firstfree}a up
    echo ${_firstfree}
}

# create tap and attach to to bridge $1
# out of created tap
get_my_tap()
{
    local _firstfree

    [ -z "${1}" ] && echo "No bridge" && return 1

    _firstfree=$( find_first_freenic tap )

    [ $? -eq 1 ] && echo "No free available tap" && return 1

    ifconfig ${_firstfree} create >/dev/null 2>/dev/null
    ifconfig ${1} addm ${_firstfree}
#    sysctl -w net.link.tap.up_on_open=1 > /dev/null 2>&1
    ifconfig ${_firstfree} up
    echo ${_firstfree}
}