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213 lines
4.8 KiB
213 lines
4.8 KiB
# l2tp.sh - L2TPv3 tunnel backend
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# Copyright (c) 2010 OpenWrt.org
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l2tp_next_tunnel_id() {
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local max=0
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local val
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for val in $(
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local l
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l2tpv3tun show tunnel | while read l; do
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case "$l" in
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Tunnel*,*encap*) l="${l#Tunnel }"; echo "${l%%,*}";;
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esac
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done
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); do
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[ "$val" -gt "$max" ] && max="$val"
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done
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echo $((max + 1))
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}
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l2tp_next_session_id() {
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local tunnel="$1"
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local max=0
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local val
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for val in $(
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local l
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l2tpv3tun show session${tunnel:+ tunnel_id "$tunnel"} | while read l; do
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case "$l" in
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Session*in*) l="${l#Session }"; echo "${l%% *}";;
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esac
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done
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); do
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[ "$val" -gt "$max" ] && max="$val"
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done
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echo $((max + 1))
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}
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l2tp_tunnel_exists() {
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test -n "$(l2tpv3tun show tunnel tunnel_id "$1" 2>/dev/null)"
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}
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l2tp_session_exists() {
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test -n "$(l2tpv3tun show session tunnel_id "$1" session_id "$2" 2>/dev/null)"
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}
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l2tp_ifname() {
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l2tpv3tun show session tunnel_id "$1" session_id "$2" 2>/dev/null | \
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sed -ne 's/^.*interface name: //p'
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}
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l2tp_lock() {
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lock /var/lock/l2tp-setup
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}
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l2tp_unlock() {
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lock -u /var/lock/l2tp-setup
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}
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l2tp_log() {
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logger -t "ifup-l2tp" "$@"
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}
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# Hook into scan_interfaces() to synthesize a .device option
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# This is needed for /sbin/ifup to properly dispatch control
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# to setup_interface_l2tp() even if no .ifname is set in
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# the configuration.
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scan_l2tp() {
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local dev
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config_get dev "$1" device
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config_set "$1" device "${dev:+$dev }l2tp-$1"
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}
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coldplug_interface_l2tp() {
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setup_interface_l2tp "l2tp-$1" "$1"
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}
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setup_interface_l2tp() {
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local iface="$1"
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local cfg="$2"
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local link="l2tp-$cfg"
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l2tp_lock
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# prevent recursion
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local up="$(uci_get_state network "$cfg" up 0)"
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[ "$up" = 0 ] || {
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l2tp_unlock
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return 0
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}
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local tunnel_id
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config_get tunnel_id "$cfg" tunnel_id
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[ -n "$tunnel_id" ] || {
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tunnel_id="$(l2tp_next_tunnel_id)"
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uci_set_state network "$cfg" tunnel_id "$tunnel_id"
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l2tp_log "No tunnel ID specified, assuming $tunnel_id"
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}
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local peer_tunnel_id
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config_get peer_tunnel_id "$cfg" peer_tunnel_id
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[ -n "$peer_tunnel_id" ] || {
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peer_tunnel_id="$tunnel_id"
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uci_set_state network "$cfg" peer_tunnel_id "$peer_tunnel_id"
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l2tp_log "No peer tunnel ID specified, assuming $peer_tunnel_id"
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}
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local encap
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config_get encap "$cfg" encap udp
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local sport dport
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[ "$encap" = udp ] && {
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config_get sport "$cfg" sport 1701
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config_get dport "$cfg" dport 1701
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}
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local peeraddr
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config_get peeraddr "$cfg" peeraddr
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[ -z "$peeraddr" ] && config_get peeraddr "$cfg" peer6addr
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local localaddr
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case "$peeraddr" in
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*:*) config_get localaddr "$cfg" local6addr ;;
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*) config_get localaddr "$cfg" localaddr ;;
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esac
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[ -n "$localaddr" -a -n "$peeraddr" ] || {
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l2tp_log "Missing local or peer address for tunnel $cfg - skipping"
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return 1
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}
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(
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while ! l2tp_tunnel_exists "$tunnel_id"; do
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[ -n "$sport" ] && l2tpv3tun show tunnel 2>/dev/null | grep -q "ports: $sport/" && {
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l2tp_log "There already is a tunnel with src port $sport - skipping"
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l2tp_unlock
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return 1
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}
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l2tpv3tun add tunnel tunnel_id "$tunnel_id" peer_tunnel_id "$peer_tunnel_id" \
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encap "$encap" local "$localaddr" remote "$peeraddr" \
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${sport:+udp_sport "$sport"} ${dport:+udp_dport "$dport"}
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# Wait for tunnel
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sleep 1
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done
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local session_id
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config_get session_id "$cfg" session_id
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[ -n "$session_id" ] || {
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session_id="$(l2tp_next_session_id "$tunnel_id")"
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uci_set_state network "$cfg" session_id "$session_id"
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l2tp_log "No session ID specified, assuming $session_id"
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}
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local peer_session_id
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config_get peer_session_id "$cfg" peer_session_id
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[ -n "$peer_session_id" ] || {
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peer_session_id="$session_id"
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uci_set_state network "$cfg" peer_session_id "$peer_session_id"
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l2tp_log "No peer session ID specified, assuming $peer_session_id"
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}
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while ! l2tp_session_exists "$tunnel_id" "$session_id"; do
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l2tpv3tun add session ifname "$link" tunnel_id "$tunnel_id" \
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session_id "$session_id" peer_session_id "$peer_session_id"
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# Wait for session
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sleep 1
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done
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local dev
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config_get dev "$cfg" device
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local ifn
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config_get ifn "$cfg" ifname
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uci_set_state network "$cfg" ifname "${ifn:-$dev}"
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uci_set_state network "$cfg" device "$dev"
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local mtu
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config_get mtu "$cfg" mtu 1462
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local ttl
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config_get ttl "$cfg" ttl
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ip link set mtu "$mtu" ${ttl:+ ttl "$ttl"} dev "$link"
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# IP setup inherited from proto static
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prepare_interface "$link" "$cfg"
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setup_interface_static "${ifn:-$dev}" "$cfg"
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ip link set up dev "$link"
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uci_set_state network "$cfg" up 1
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l2tp_unlock
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) &
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}
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stop_interface_l2tp() {
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local cfg="$1"
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local link="l2tp-$cfg"
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local tunnel=$(uci_get_state network "$cfg" tunnel_id)
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local session=$(uci_get_state network "$cfg" session_id)
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[ -n "$tunnel" ] && [ -n "$session" ] && {
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l2tpv3tun del session tunnel_id "$tunnel" session_id "$session"
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l2tpv3tun del tunnel tunnel_id "$tunnel"
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}
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}
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