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# 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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