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172 lines
4.1 KiB
172 lines
4.1 KiB
#!/bin/sh
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. /lib/functions.sh
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. /lib/functions/network.sh
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. /lib/mwan3/mwan3.sh
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trap_with_arg()
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{
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func="$1" ; shift
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pid="$1" ; shift
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for sig ; do
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# shellcheck disable=SC2064
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trap "$func $sig $pid" "$sig"
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done
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}
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func_trap()
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{
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kill -${1} ${2} 2>/dev/null
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}
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mwan3_add_all_routes()
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{
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local tid IP IPT route_line family active_tbls tid initial_state error
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local ipv=$1
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add_active_tbls()
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{
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let tid++
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config_get family "$1" family ipv4
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config_get initial_state "$1" initial_state "online"
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[ "$family" != "$ipv" ] && return
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if $IPT -S "mwan3_iface_in_$1" &> /dev/null; then
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active_tbls="$active_tbls${tid} "
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fi
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}
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add_route()
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{
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let tid++
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[ -n "${active_tbls##* $tid *}" ] && return
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error=$($IP route add table $tid $route_line 2>&1) ||
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LOG warn "failed to add $route_line to table $tid - error: $error"
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}
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mwan3_update_dev_to_table
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[ "$ipv" = "ipv6" ] && [ $NO_IPV6 -ne 0 ] && return
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if [ "$ipv" = "ipv4" ]; then
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IP="$IP4"
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IPT="$IPT4"
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elif [ "$ipv" = "ipv6" ]; then
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IP="$IP6"
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IPT="$IPT6"
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fi
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tid=0
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active_tbls=" "
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config_foreach add_active_tbls interface
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[ "$active_tbls" = " " ] && return
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mwan3_get_routes | while read -r route_line; do
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mwan3_route_line_dev "tid" "$route_line" "$ipv"
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if [ -n "$tid" ] && [ -z "${active_tbls##* $tid *}" ]; then
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$IP route add table $tid $route_line
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elif [ -n "${route_line##default*}" ] && [ -n "${route_line##fe80::/64*}" ]; then
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config_foreach add_route interface
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fi
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done
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}
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mwan3_rtmon_route_handle()
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{
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local action route_line family tbl device line tid
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route_line=${1##"Deleted "}
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route_family=$2
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if [ "$route_line" = "$1" ]; then
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action="replace"
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$IPS -! add mwan3_connected_${route_family##ip} ${route_line%% *}
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else
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action="del"
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mwan3_set_connected_${route_family}
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fi
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if [ -z "${route_line##*linkdown*}" ]; then
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LOG debug "attempting to add link on down interface - $route_line"
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fi
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if [ "$route_family" = "ipv4" ]; then
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IP="$IP4"
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elif [ "$route_family" = "ipv6" ] && [ $NO_IPV6 -eq 0 ]; then
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IP="$IP6"
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else
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LOG warn "route update called with invalid family - $route_family"
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return
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fi
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route_line=$(echo "$route_line" | sed -ne "$MWAN3_ROUTE_LINE_EXP")
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handle_route() {
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local error
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local iface=$1
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tbl=$($IP route list table $tid 2>/dev/null)$'\n'
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if [ -n "$iface" ] && [ "$(mwan3_get_mwan3track_status $iface)" != "active" ]; then
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LOG debug "interface $iface is disabled - skipping '$route_line'";
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return
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fi
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# check that action needs to be performed. May not need to take action if we
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# got a delete event, but table was already flushed
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if [ $action = "del" ] && [ -n "${tbl##*$route_line$'\n'*}" ]; then
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LOG debug "skipping already deleted route table $tid - skipping '$route_line'"
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return
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fi
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network_get_device device "$iface"
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LOG debug "adjusting route $device: '$IP route $action table $tid $route_line'"
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error=$($IP route "$action" table $tid $route_line 2>&1)||
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LOG warn "failed: '$IP route $action table $tid $route_line' - error: $error"
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}
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handle_route_cb(){
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local iface=$1
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let tid++
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config_get family "$iface" family ipv4
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[ "$family" != "$route_family" ] && return
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handle_route "$iface"
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}
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mwan3_update_dev_to_table
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mwan3_route_line_dev "tid" "$route_line" "$route_family"
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if [ -n "$tid" ]; then
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handle_route
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elif [ -n "${route_line##default*}" ] && [ -n "${route_line##fe80::/64*}" ]; then
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config_foreach handle_route_cb interface
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fi
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}
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main()
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{
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local IP family
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mwan3_init
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family=$1
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[ -z $family ] && family=ipv4
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if [ "$family" = "ipv6" ]; then
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if [ $NO_IPV6 -ne 0 ]; then
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LOG warn "mwan3rtmon started for ipv6, but ipv6 not enabled on system"
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exit 1
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fi
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IP="$IP6"
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else
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IP="$IP4"
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fi
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sh -c "echo \$\$; exec $IP monitor route" | {
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read -r monitor_pid
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trap_with_arg func_trap "$monitor_pid" SIGINT SIGTERM SIGKILL
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KILL -SIGSTOP $$
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while IFS='' read -r line; do
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[ -z "${line##*table*}" ] && continue
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LOG debug "handling route update $family '$line'"
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mwan3_rtmon_route_handle "$line" "$family"
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done
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} &
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child=$!
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trap_with_arg func_trap "$child" SIGINT SIGTERM SIGKILL
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mwan3_set_connected_${family}
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mwan3_add_all_routes ${family}
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kill -SIGCONT $child
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wait $child
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}
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main "$@"
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