openwrtv4/package/network/services/ppp/files/ppp.sh
Steven Barth 48a95eff38 ppp : Unnumbered support
Adds PPP unnumbered support via the parameter unnumbered which points to a logical OpenWRT interface.
The PPP proto shell handler will "borrow" an IP address from the unnumbered interface (if multiple
IP addresses are present the longest prefix different from 32 will be "borrowed") for which a host
interface dependency will be created. Due to the host interface dependency the PPP unnumbered interface
will only "borrow" an IP address from an interface which is up.
The borrowed IP address will be shared as local IP address by the PPP daemon and no other local IP
will be accepted from the peer in the IPCP negotiation.

A typical use case is the usage of a public IP subnet on the Lan interface which will be shared
by the PPP interface as local IP address.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

SVN-Revision: 45948
2015-06-12 07:37:53 +00:00

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#!/bin/sh
[ -x /usr/sbin/pppd ] || exit 0
[ -n "$INCLUDE_ONLY" ] || {
. /lib/functions.sh
. /lib/functions/network.sh
. ../netifd-proto.sh
init_proto "$@"
}
ppp_select_ipaddr()
{
local subnets=$1
local res
local res_mask
for subnet in $subnets; do
local addr="${subnet%%/*}"
local mask="${subnet#*/}"
if [ -n "$res_mask" -a "$mask" != 32 ]; then
[ "$mask" -gt "$res_mask" ] || [ "$res_mask" = 32 ] && {
res="$addr"
res_mask="$mask"
}
elif [ -z "$res_mask" ]; then
res="$addr"
res_mask="$mask"
fi
done
echo "$res"
}
ppp_exitcode_tostring()
{
local errorcode=$1
[ -n "$errorcode" ] || errorcode=5
case "$errorcode" in
0) echo "OK" ;;
1) echo "FATAL_ERROR" ;;
2) echo "OPTION_ERROR" ;;
3) echo "NOT_ROOT" ;;
4) echo "NO_KERNEL_SUPPORT" ;;
5) echo "USER_REQUEST" ;;
6) echo "LOCK_FAILED" ;;
7) echo "OPEN_FAILED" ;;
8) echo "CONNECT_FAILED" ;;
9) echo "PTYCMD_FAILED" ;;
10) echo "NEGOTIATION_FAILED" ;;
11) echo "PEER_AUTH_FAILED" ;;
12) echo "IDLE_TIMEOUT" ;;
13) echo "CONNECT_TIME" ;;
14) echo "CALLBACK" ;;
15) echo "PEER_DEAD" ;;
16) echo "HANGUP" ;;
17) echo "LOOPBACK" ;;
18) echo "INIT_FAILED" ;;
19) echo "AUTH_TOPEER_FAILED" ;;
20) echo "TRAFFIC_LIMIT" ;;
21) echo "CNID_AUTH_FAILED";;
*) echo "UNKNOWN_ERROR" ;;
esac
}
ppp_generic_init_config() {
proto_config_add_string username
proto_config_add_string password
proto_config_add_string keepalive
proto_config_add_boolean keepalive_adaptive
proto_config_add_int demand
proto_config_add_string pppd_options
proto_config_add_string 'connect:file'
proto_config_add_string 'disconnect:file'
proto_config_add_string ipv6
proto_config_add_boolean authfail
proto_config_add_int mtu
proto_config_add_string pppname
proto_config_add_string unnumbered
}
ppp_generic_setup() {
local config="$1"; shift
local localip
json_get_vars ipv6 demand keepalive keepalive_adaptive username password pppd_options pppname unnumbered
if [ "$ipv6" = 0 ]; then
ipv6=""
elif [ -z "$ipv6" -o "$ipv6" = auto ]; then
ipv6=1
proto_export "AUTOIPV6=1"
fi
if [ "${demand:-0}" -gt 0 ]; then
demand="precompiled-active-filter /etc/ppp/filter demand idle $demand"
else
demand=""
fi
[ -n "$mtu" ] || json_get_var mtu mtu
[ -n "$pppname" ] || pppname="${proto:-ppp}-$config"
[ -n "$unnumbered" ] && {
local subnets
( proto_add_host_dependency "$config" "" "$unnumbered" )
network_get_subnets subnets "$unnumbered"
localip=$(ppp_select_ipaddr "$subnets")
[ -n "$localip" ] || {
proto_block_restart "$config"
return
}
}
local lcp_failure="${keepalive%%[, ]*}"
local lcp_interval="${keepalive##*[, ]}"
local lcp_adaptive="lcp-echo-adaptive"
[ "${lcp_failure:-0}" -lt 1 ] && lcp_failure=""
[ "$lcp_interval" != "$keepalive" ] || lcp_interval=5
[ "${keepalive_adaptive:-1}" -lt 1 ] && lcp_adaptive=""
[ -n "$connect" ] || json_get_var connect connect
[ -n "$disconnect" ] || json_get_var disconnect disconnect
proto_run_command "$config" /usr/sbin/pppd \
nodetach ipparam "$config" \
ifname "$pppname" \
${localip:+$localip:} \
${lcp_failure:+lcp-echo-interval $lcp_interval lcp-echo-failure $lcp_failure $lcp_adaptive} \
${ipv6:++ipv6} \
nodefaultroute \
usepeerdns \
$demand maxfail 1 \
${username:+user "$username" password "$password"} \
${connect:+connect "$connect"} \
${disconnect:+disconnect "$disconnect"} \
ip-up-script /lib/netifd/ppp-up \
ipv6-up-script /lib/netifd/ppp-up \
ip-down-script /lib/netifd/ppp-down \
ipv6-down-script /lib/netifd/ppp-down \
${mtu:+mtu $mtu mru $mtu} \
"$@" $pppd_options
}
ppp_generic_teardown() {
local interface="$1"
local errorstring=$(ppp_exitcode_tostring $ERROR)
case "$ERROR" in
0)
;;
2)
proto_notify_error "$interface" "$errorstring"
proto_block_restart "$interface"
;;
11|19)
json_get_var authfail authfail
proto_notify_error "$interface" "$errorstring"
if [ "${authfail:-0}" -gt 0 ]; then
proto_block_restart "$interface"
fi
;;
*)
proto_notify_error "$interface" "$errorstring"
;;
esac
proto_kill_command "$interface"
}
# PPP on serial device
proto_ppp_init_config() {
proto_config_add_string "device"
ppp_generic_init_config
no_device=1
available=1
lasterror=1
}
proto_ppp_setup() {
local config="$1"
json_get_var device device
ppp_generic_setup "$config" "$device"
}
proto_ppp_teardown() {
ppp_generic_teardown "$@"
}
proto_pppoe_init_config() {
ppp_generic_init_config
proto_config_add_string "ac"
proto_config_add_string "service"
proto_config_add_string "host_uniq"
lasterror=1
}
proto_pppoe_setup() {
local config="$1"
local iface="$2"
for module in slhc ppp_generic pppox pppoe; do
/sbin/insmod $module 2>&- >&-
done
json_get_var mtu mtu
mtu="${mtu:-1492}"
json_get_var ac ac
json_get_var service service
json_get_var host_uniq host_uniq
ppp_generic_setup "$config" \
plugin rp-pppoe.so \
${ac:+rp_pppoe_ac "$ac"} \
${service:+rp_pppoe_service "$service"} \
${host_uniq:+host-uniq "$host_uniq"} \
"nic-$iface"
}
proto_pppoe_teardown() {
ppp_generic_teardown "$@"
}
proto_pppoa_init_config() {
ppp_generic_init_config
proto_config_add_int "atmdev"
proto_config_add_int "vci"
proto_config_add_int "vpi"
proto_config_add_string "encaps"
no_device=1
available=1
lasterror=1
}
proto_pppoa_setup() {
local config="$1"
local iface="$2"
for module in slhc ppp_generic pppox pppoatm; do
/sbin/insmod $module 2>&- >&-
done
json_get_vars atmdev vci vpi encaps
case "$encaps" in
1|vc) encaps="vc-encaps" ;;
*) encaps="llc-encaps" ;;
esac
ppp_generic_setup "$config" \
plugin pppoatm.so \
${atmdev:+$atmdev.}${vpi:-8}.${vci:-35} \
${encaps}
}
proto_pppoa_teardown() {
ppp_generic_teardown "$@"
}
proto_pptp_init_config() {
ppp_generic_init_config
proto_config_add_string "server"
proto_config_add_string "interface"
available=1
no_device=1
lasterror=1
}
proto_pptp_setup() {
local config="$1"
local iface="$2"
local ip serv_addr server interface
json_get_vars interface server
[ -n "$server" ] && {
for ip in $(resolveip -t 5 "$server"); do
( proto_add_host_dependency "$config" "$ip" $interface )
serv_addr=1
done
}
[ -n "$serv_addr" ] || {
echo "Could not resolve server address"
sleep 5
proto_setup_failed "$config"
exit 1
}
local load
for module in slhc ppp_generic ppp_async ppp_mppe ip_gre gre pptp; do
grep -q "^$module " /proc/modules && continue
/sbin/insmod $module 2>&- >&-
load=1
done
[ "$load" = "1" ] && sleep 1
ppp_generic_setup "$config" \
plugin pptp.so \
pptp_server $server \
file /etc/ppp/options.pptp
}
proto_pptp_teardown() {
ppp_generic_teardown "$@"
}
[ -n "$INCLUDE_ONLY" ] || {
add_protocol ppp
[ -f /usr/lib/pppd/*/rp-pppoe.so ] && add_protocol pppoe
[ -f /usr/lib/pppd/*/pppoatm.so ] && add_protocol pppoa
[ -f /usr/lib/pppd/*/pptp.so ] && add_protocol pptp
}