network/ifup.sh: only use dhcp on unknown interfaces for ip=dhcp

[thirdparty/dracut.git] / modules.d / 40network / ifup.sh

#!/bin/sh
#
# We don't need to check for ip= errors here, that is handled by the
# cmdline parser script
#
# without $2 means this is for real netroot case
# or it is for manually bring up network ie. for kdump scp vmcore
PATH=/usr/sbin:/usr/bin:/sbin:/bin

type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
type ip_to_var >/dev/null 2>&1 || . /lib/net-lib.sh

# Huh? No $1?
[ -z "$1" ] && exit 1

# $netif reads easier than $1
netif=$1
use_bridge='false'
use_vlan='false'

# enslave this interface to bond?
for i in /tmp/bond.*.info; do
    [ -e "$i" ] || continue
    unset bondslaves
    unset bondname
    . "$i"
    for slave in $bondslaves ; do
        if [ "$netif" = "$slave" ] ; then
            netif=$bondname
            break 2
        fi
    done
done

if [ -e /tmp/team.info ]; then
    . /tmp/team.info
    for slave in $teamslaves ; do
        if [ "$netif" = "$slave" ] ; then
            netif=$teammaster
        fi
    done
fi

if [ -e /tmp/vlan.info ]; then
    . /tmp/vlan.info
    if [ "$netif" = "$phydevice" ]; then
        if [ "$netif" = "$bondname" ] && [ -n "$DO_BOND_SETUP" ] ; then
            : # We need to really setup bond (recursive call)
        elif [ "$netif" = "$teammaster" ] && [ -n "$DO_TEAM_SETUP" ] ; then
            : # We need to really setup team (recursive call)
        else
            netif="$vlanname"
            use_vlan='true'
        fi
    fi
fi

# bridge this interface?
if [ -e /tmp/bridge.info ]; then
    . /tmp/bridge.info
    for ethname in $bridgeslaves ; do
        if [ "$netif" = "$ethname" ]; then
            if [ "$netif" = "$bondname" ] && [ -n "$DO_BOND_SETUP" ] ; then
                : # We need to really setup bond (recursive call)
            elif [ "$netif" = "$teammaster" ] && [ -n "$DO_TEAM_SETUP" ] ; then
                : # We need to really setup team (recursive call)
            elif [ "$netif" = "$vlanname" ] && [ -n "$DO_VLAN_SETUP" ]; then
                : # We need to really setup vlan (recursive call)
            else
                netif="$bridgename"
                use_bridge='true'
            fi
        fi
    done
fi

# disable manual ifup while netroot is set for simplifying our logic
# in netroot case we prefer netroot to bringup $netif automaticlly
[ -n "$2" -a "$2" = "-m" ] && [ -z "$netroot" ] && manualup="$2"

if [ -n "$manualup" ]; then
    >/tmp/net.$netif.manualup
    rm -f /tmp/net.${netif}.did-setup
else
    [ -e /tmp/net.${netif}.did-setup ] && exit 0
    [ -e /sys/class/net/$netif/address ] && \
        [ -e /tmp/net.$(cat /sys/class/net/$netif/address).did-setup ] && exit 0
fi

# Run dhclient
do_dhcp() {
    # dhclient-script will mark the netif up and generate the online
    # event for nfsroot
    # XXX add -V vendor class and option parsing per kernel

    local _COUNT=0
    local _timeout=$(getargs rd.net.timeout.dhcp=)
    local _DHCPRETRY=$(getargs rd.net.dhcp.retry=)
    _DHCPRETRY=${_DHCPRETRY:-1}

    [ -e /tmp/dhclient.$netif.pid ] && return 0

    if ! iface_has_link $netif; then
        warn "No carrier detected on interface $netif"
        return 1
    fi

    while [ $_COUNT -lt $_DHCPRETRY ]; do
        info "Starting dhcp for interface $netif"
        dhclient "$@" \
                 ${_timeout:+-timeout $_timeout} \
                 -q \
                 -cf /etc/dhclient.conf \
                 -pf /tmp/dhclient.$netif.pid \
                 -lf /tmp/dhclient.$netif.lease \
                 $netif \
            && return 0
        _COUNT=$(($_COUNT+1))
        [ $_COUNT -lt $_DHCPRETRY ] && sleep 1
    done
    warn "dhcp for interface $netif failed"
    return 1
}

load_ipv6() {
    [ -d /proc/sys/net/ipv6 ] && return
    modprobe ipv6
    i=0
    while [ ! -d /proc/sys/net/ipv6 ]; do
        i=$(($i+1))
        [ $i -gt 10 ] && break
        sleep 0.1
    done
}

do_ipv6auto() {
    load_ipv6
    echo 0 > /proc/sys/net/ipv6/conf/$netif/forwarding
    echo 1 > /proc/sys/net/ipv6/conf/$netif/accept_ra
    echo 1 > /proc/sys/net/ipv6/conf/$netif/accept_redirects
    linkup $netif
    wait_for_ipv6_auto $netif

    [ -n "$hostname" ] && echo "echo $hostname > /proc/sys/kernel/hostname" > /tmp/net.$netif.hostname

    return 0
}

# Handle static ip configuration
do_static() {
    strglobin $ip '*:*:*' && load_ipv6

    if ! linkup $netif; then
        warn "Could bring interface $netif up!"
        return 1
    fi

    ip route get "$ip" | {
        read a rest
        if [ "$a" = "local" ]; then
            warn "Not assigning $ip to interface $netif, cause it is already assigned!"
            return 1
        fi
        return 0
    } || return 1

    [ -n "$macaddr" ] && ip link set address $macaddr dev $netif
    [ -n "$mtu" ] && ip link set mtu $mtu dev $netif
    if strglobin $ip '*:*:*'; then
        # note no ip addr flush for ipv6
        ip addr add $ip/$mask ${srv:+peer $srv} dev $netif
        wait_for_ipv6_dad $netif
    else
        if ! arping -f -q -D -c 2 -I $netif $ip; then
            warn "Duplicate address detected for $ip for interface $netif."
            return 1
        fi
        ip addr flush dev $netif
        ip addr add $ip/$mask ${srv:+peer $srv} brd + dev $netif
    fi

    [ -n "$gw" ] && echo ip route replace default via $gw dev $netif > /tmp/net.$netif.gw
    [ -n "$hostname" ] && echo "echo $hostname > /proc/sys/kernel/hostname" > /tmp/net.$netif.hostname

    return 0
}

# loopback is always handled the same way
if [ "$netif" = "lo" ] ; then
    ip link set lo up
    ip addr add 127.0.0.1/8 dev lo
    exit 0
fi

# start bond if needed
if [ -e /tmp/bond.${netif}.info ]; then
    . /tmp/bond.${netif}.info

    if [ "$netif" = "$bondname" ] && [ ! -e /tmp/net.$bondname.up ] ; then # We are master bond device
        modprobe bonding
        echo "+$netif" >  /sys/class/net/bonding_masters
        ip link set $netif down

        # Stolen from ifup-eth
        # add the bits to setup driver parameters here
        for arg in $bondoptions ; do
            key=${arg%%=*};
            value=${arg##*=};
            # %{value:0:1} is replaced with non-bash specific construct
            if [ "${key}" = "arp_ip_target" -a "${#value}" != "0" -a "+${value%%+*}" != "+" ]; then
                OLDIFS=$IFS;
                IFS=',';
                for arp_ip in $value; do
                    echo +$arp_ip > /sys/class/net/${netif}/bonding/$key
                done
                IFS=$OLDIFS;
            else
                echo $value > /sys/class/net/${netif}/bonding/$key
            fi
        done

        linkup $netif

        for slave in $bondslaves ; do
            ip link set $slave down
            cat /sys/class/net/$slave/address > /tmp/net.${netif}.${slave}.hwaddr
            echo "+$slave" > /sys/class/net/$bondname/bonding/slaves
            linkup $slave
        done

        # add the bits to setup the needed post enslavement parameters
        for arg in $BONDING_OPTS ; do
            key=${arg%%=*};
            value=${arg##*=};
            if [ "${key}" = "primary" ]; then
                echo $value > /sys/class/net/${netif}/bonding/$key
            fi
        done
    fi
fi

if [ -e /tmp/team.info ]; then
    . /tmp/team.info
    if [ "$netif" = "$teammaster" ] && [ ! -e /tmp/net.$teammaster.up ] ; then
        # We shall only bring up those _can_ come up
        # in case of some slave is gone in active-backup mode
        working_slaves=""
        for slave in $teamslaves ; do
            ip link set $slave up 2>/dev/null
            if wait_for_if_up $slave; then
                working_slaves+="$slave "
            fi
        done
        # Do not add slaves now
        teamd -d -U -n -N -t $teammaster -f /etc/teamd/$teammaster.conf
        for slave in $working_slaves; do
            # team requires the slaves to be down before joining team
            ip link set $slave down
            teamdctl $teammaster port add $slave
        done
        ip link set $teammaster up
    fi
fi

# XXX need error handling like dhclient-script

if [ -e /tmp/bridge.info ]; then
    . /tmp/bridge.info
# start bridge if necessary
    if [ "$netif" = "$bridgename" ] && [ ! -e /tmp/net.$bridgename.up ]; then
        brctl addbr $bridgename
        brctl setfd $bridgename 0
        for ethname in $bridgeslaves ; do
            if [ "$ethname" = "$bondname" ] ; then
                DO_BOND_SETUP=yes ifup $bondname -m
            elif [ "$ethname" = "$teammaster" ] ; then
                DO_TEAM_SETUP=yes ifup $teammaster -m
            elif [ "$ethname" = "$vlanname" ]; then
                DO_VLAN_SETUP=yes ifup $vlanname -m
            else
                linkup $ethname
            fi
            brctl addif $bridgename $ethname
        done
    fi
fi

get_vid() {
    case "$1" in
    vlan*)
        echo ${1#vlan}
        ;;
    *.*)
        echo ${1##*.}
        ;;
    esac
}

if [ "$netif" = "$vlanname" ] && [ ! -e /tmp/net.$vlanname.up ]; then
    modprobe 8021q
    if [ "$phydevice" = "$bondname" ] ; then
        DO_BOND_SETUP=yes ifup $phydevice -m
    elif [ "$phydevice" = "$teammaster" ] ; then
        DO_TEAM_SETUP=yes ifup $phydevice -m
    else
        linkup "$phydevice"
    fi
    ip link add dev "$vlanname" link "$phydevice" type vlan id "$(get_vid $vlanname)"
    ip link set "$vlanname" up
fi

# No ip lines default to dhcp
ip=$(getarg ip)

if [ -z "$ip" ]; then
    namesrv=$(getargs nameserver)
    for s in $namesrv; do
        echo nameserver $s >> /tmp/net.$netif.resolv.conf
    done

    if [ "$netroot" = "dhcp6" ]; then
        do_dhcp -6
    else
        do_dhcp -4
    fi
fi


# Specific configuration, spin through the kernel command line
# looking for ip= lines
for p in $(getargs ip=); do
    ip_to_var $p
    # skip ibft
    [ "$autoconf" = "ibft" ] && continue

    case "$dev" in
        ??:??:??:??:??:??)  # MAC address
            _dev=$(iface_for_mac $dev)
            [ -n "$_dev" ] && dev="$_dev"
            ;;
        ??-??-??-??-??-??)  # MAC address in BOOTIF form
            _dev=$(iface_for_mac $(fix_bootif $dev))
            [ -n "$_dev" ] && dev="$_dev"
            ;;
    esac

    # If this option isn't directed at our interface, skip it
    [ -n "$dev" ] && [ "$dev" != "$netif" ] && \
    [ "$use_bridge" != 'true' ] && \
    [ "$use_vlan" != 'true' ] && continue

    # setup nameserver
    namesrv="$dns1 $dns2 $(getargs nameserver)"
    for s in $namesrv; do
        echo nameserver $s >> /tmp/net.$netif.resolv.conf
    done

    # Store config for later use
    for i in ip srv gw mask hostname macaddr dns1 dns2; do
        eval '[ "$'$i'" ] && echo '$i'="$'$i'"'
    done > /tmp/net.$netif.override

    for autoopt in $(str_replace "$autoconf" "," " "); do
        case $autoopt in
            dhcp|on|any)
                do_dhcp -4 ;;
            dhcp6)
                load_ipv6
                do_dhcp -6 ;;
            auto6)
                do_ipv6auto ;;
            *)
                do_static ;;
        esac
    done
    ret=$?

    > /tmp/net.${netif}.up

    if [ -e /sys/class/net/${netif}/address ]; then
        > /tmp/net.$(cat /sys/class/net/${netif}/address).up
    fi

    case $autoconf in
        dhcp|on|any|dhcp6)
            ;;
        *)
            if [ $ret -eq 0 ]; then
                setup_net $netif
                source_hook initqueue/online $netif
                if [ -z "$manualup" ]; then
                    /sbin/netroot $netif
                fi
            fi
            ;;
    esac

    exit 0
done

# netif isn't the top stack? Then we should exit here.
# eg. netif is bond0. br0 is on top of it. dhcp br0 is correct but dhcp
#     bond0 doesn't make sense.
if [ -n "$DO_BOND_SETUP" -o -n "$DO_TEAM_SETUP" -o -n "$DO_VLAN_SETUP" ]; then
    exit 0
fi

# no ip option directed at our interface?
if [ ! -e /tmp/net.${netif}.up ]; then
    if getargs 'ip=dhcp6'; then
        load_ipv6
        do_dhcp -6
    elif getargs 'ip=dhcp'; then
        do_dhcp -4
    fi
fi

exit 0