#!/bin/sh
#----------------------------------------------------------------------------
# /etc/rc.d/circuits.ppp-ethernet - PPP over Ethernet
#
# Creation:     09.09.2000 fm
# Last Update:  $Id$
#----------------------------------------------------------------------------

# PPPoE, see RFC 2516 for details
DSL_PPPOE_MTU=1492     # 1500 (Ethernet MTU) - 6 (PPPoE header)
                       # - 2 (PPP header without address/control bytes)

# $1 = circuit information file
# $2 = PPP peer file
# $3 = variable receiving an error message (if any)
ppp_ethernet_circuit_add()
{
    # keep this synchronized with check/pppoe.ext
    local circ_ppp_ethernet_type=${circ_ppp_ethernet_type:-kernel}
    : ${circ_ppp_mtu:=$DSL_PPPOE_MTU}
    : ${circ_ppp_mru:=$DSL_PPPOE_MTU}

    case $circ_ppp_ethernet_type in
    kernel)
        cat << EOF
plugin rp-pppoe.so
$circ_ppp_ethernet_dev
noaccomp
nopcomp
default-asyncmap
EOF
        do_modprobe pppoe
        ;;
    daemon)
        # From the pppoe documentation:
        # "You should set the PPPoE timeout to be about four times the LCP echo
        # interval."
        # We don't use "four" but ($circ_ppp_lcp_echo_max_failures + 1).
        local pppoe_timeout=$((${circ_ppp_lcp_echo_interval:-PPP_LCP_ECHO_INTERVAL} *
                                (${circ_ppp_lcp_echo_max_failures:-PPP_LCP_ECHO_MAX_FAILURES} + 1)))

        # the command that pppd shall execute
        local pppoe_cmd="exec /usr/sbin/pppoe -U -I $circ_ppp_ethernet_dev -T $pppoe_timeout"

        do_modprobe ppp_async

        cat << EOF
pty "$pppoe_cmd"
local
noaccomp
nopcomp
default-asyncmap
EOF
        ;;
    esac >> $2

    cat >> $1 << EOF
circ_ppp_ethernet_dev="$circ_ppp_ethernet_dev"
circ_ppp_ethernet_type="$circ_ppp_ethernet_type"
EOF

    # our Ethernet device always uses the largest MTU possible (1500)
    ip link set dev $circ_ppp_ethernet_dev mtu 1500
    ip link set dev $circ_ppp_ethernet_dev up

    # for compatibility, map pppoe to the first configured PPPoE circuit
    local pppoe_circ=$(circuit_lookup_alias pppoe)
    if [ -z "$pppoe_circ" ]
    then
        # map pppoe circuit to be able to use 'pppoe' as a circuit name
        # in fli4lctrl invocations
        circuit_register_alias pppoe $circ_id
        # map pppoe interface to be able to use 'pppoe' in firewall
        # rules
        net_alias_add pppoe $circ_dev TID_
    fi

    return 0
}