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#!/bin/sh
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# fips-mesh-setup — configure open 802.11s mesh interfaces for FIPS backhaul.
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#
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# Usage:
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# fips-mesh-setup <radio> [mesh-id] e.g. fips-mesh-setup radio1
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# fips-mesh-setup remove [radio] no radio: remove all instances
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#
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# Creates a mesh-point interface on the given radio and leaves everything
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# above L2 to FIPS. Run once per radio: dual-band routers can mesh on both
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# bands at once (2.4 GHz reaches further, 5 GHz carries more). Note this is
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# failover, not multipath — FIPS keeps one active link per peer; the other
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# band stands by and reconnects the peer if the active link dies.
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#
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# - encryption 'none' — the mesh is OPEN on purpose. FIPS's Noise IK
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# handshake authenticates and encrypts every peer link, so SAE would
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# only duplicate that (and on ath10k it forces the slower raw Tx/Rx
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# firmware mode). A stranger can form an 802.11s peering but cannot
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# pass the FIPS handshake.
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# - mesh_fwding '0' — disables 802.11s HWMP forwarding so each mesh
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# link is a plain L2 neighbor link. FIPS is the routing layer; two
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# routing layers would fight.
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#
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# Interfaces are named per radio index (radio0 -> fips-mesh0, radio1 ->
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# fips-mesh1) and are intentionally NOT bridged into br-lan: the FIPS
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# Ethernet transport binds each directly and runs discovery beacons over it.
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#
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# The shipped /etc/fips/fips.yaml carries 'mesh0' and 'mesh1' entries under
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# 'transports.ethernet' bound to these names, but commented out — a stock
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# install that never creates fips-mesh* then logs no bind warning. This
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# helper uncomments the matching entry when it creates an interface and
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# re-comments it on remove, so the daemon binds the transport without a
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# manual config edit. After an interface is up, restart fips.
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# See docs/how-to/set-up-80211s-mesh-backhaul.md for the full guide.
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DEFAULT_MESH_ID="fips-mesh"
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CONFIG="/etc/fips/fips.yaml"
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# Replace $CONFIG with the rewritten $CONFIG.tmp. Force mode 0600 first: the
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# package installs fips.yaml 0600 (it may hold an inline 'nsec' private key),
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# and a fresh tmp file would otherwise land world-readable after the move.
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mesh_config_write() {
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chmod 600 "$CONFIG.tmp" && mv "$CONFIG.tmp" "$CONFIG"
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}
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# Uncomment the 'mesh<idx>' transports.ethernet block in $CONFIG (created by
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# 'fips-mesh-setup'). Reversible with mesh_config_disable. Returns:
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# 0 enabled (or already active) 1 no config file 2 no such block
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mesh_config_enable() {
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idx="$1"
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[ -f "$CONFIG" ] || return 1
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grep -q "^ mesh$idx:" "$CONFIG" && return 0
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grep -q "^ # mesh$idx:" "$CONFIG" || return 2
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awk -v idx="$idx" '
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$0 ~ ("^ # mesh" idx ":[ \t]*$") { blk = 1; sub(/^ # /, " "); print; next }
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blk && /^ # / { sub(/^ # /, " "); print; next }
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{ blk = 0; print }
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' "$CONFIG" > "$CONFIG.tmp" && mesh_config_write
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}
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# Re-comment the 'mesh<idx>' block so the daemon stops binding it (and stops
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# warning about the now-missing interface). Inverse of mesh_config_enable.
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mesh_config_disable() {
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idx="$1"
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[ -f "$CONFIG" ] || return 1
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grep -q "^ mesh$idx:" "$CONFIG" || return 0
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awk -v idx="$idx" '
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$0 ~ ("^ mesh" idx ":[ \t]*$") { blk = 1; sub(/^ /, " # "); print; next }
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blk && /^ / { sub(/^ /, " # "); print; next }
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{ blk = 0; print }
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' "$CONFIG" > "$CONFIG.tmp" && mesh_config_write
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}
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usage() {
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echo "Usage: fips-mesh-setup <radio> [mesh-id]" >&2
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echo " fips-mesh-setup remove [radio]" >&2
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echo "Radios on this device:" >&2
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uci show wireless 2>/dev/null | sed -n "s/^wireless\.\([^.]*\)=wifi-device$/ \1/p" >&2
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exit 1
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}
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# List the UCI section names of fips-managed mesh wifi-ifaces.
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mesh_sections() {
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uci show wireless 2>/dev/null | sed -n "s/^wireless\.\(fips_mesh[^.=]*\)=wifi-iface$/\1/p"
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}
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# ---------------------------------------------------------------------------
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# remove [radio] — delete the wireless and network sections created below
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# ---------------------------------------------------------------------------
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if [ "$1" = "remove" ]; then
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if [ -n "$2" ]; then
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SECTIONS="fips_mesh_$(printf '%s' "$2" | tr -c 'a-zA-Z0-9_' '_')"
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else
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SECTIONS="$(mesh_sections)"
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fi
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[ -n "$SECTIONS" ] || {
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echo "No fips mesh instances configured."
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exit 0
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}
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for section in $SECTIONS; do
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ifname="$(uci -q get "wireless.$section.ifname")"
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uci -q delete "wireless.$section"
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uci -q delete "network.$section"
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# Re-comment the matching mesh<N> transport in fips.yaml so the
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# daemon stops warning about the interface we just removed.
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idx="$(printf '%s' "$ifname" | sed -n 's/.*[^0-9]\([0-9]\{1,\}\)$/\1/p')"
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[ -n "$idx" ] && mesh_config_disable "$idx"
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echo "Removed ${ifname:-$section}."
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done
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uci commit wireless
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uci commit network
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# 'wifi reload' re-applies the whole wireless config, so it briefly drops
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# every client AP on all radios (a few seconds) — expected on remove.
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wifi reload
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echo "Restart fips: /etc/init.d/fips restart"
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exit 0
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fi
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RADIO="$1"
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MESH_ID="${2:-$DEFAULT_MESH_ID}"
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[ -n "$RADIO" ] || usage
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if [ "$(uci -q get "wireless.$RADIO")" != "wifi-device" ]; then
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echo "Error: '$RADIO' is not a wifi-device in /etc/config/wireless." >&2
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usage
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fi
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# One instance per radio: section fips_mesh_<radio>, netdev fips-mesh<N>
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# where N is the radio's trailing index (radio0 -> fips-mesh0). For radios
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# named without a trailing number, fall back to the first free index.
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SECTION="fips_mesh_$(printf '%s' "$RADIO" | tr -c 'a-zA-Z0-9_' '_')"
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IDX="$(printf '%s' "$RADIO" | sed -n 's/.*[^0-9]\([0-9]\{1,\}\)$/\1/p')"
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[ -n "$IDX" ] || IDX="$(printf '%s' "$RADIO" | sed -n 's/^\([0-9]\{1,\}\)$/\1/p')"
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if [ -z "$IDX" ]; then
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IDX=0
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while uci show wireless 2>/dev/null | grep -q "\.ifname='fips-mesh$IDX'"; do
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IDX=$((IDX + 1))
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done
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fi
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MESH_IFNAME="fips-mesh$IDX"
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# Refuse a name collision from another radio's instance (e.g. two radios
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# whose names end in the same digit) rather than silently hijacking it.
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OWNER="$(uci show wireless 2>/dev/null \
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| sed -n "s/^wireless\.\(fips_mesh[^.=]*\)\.ifname='$MESH_IFNAME'$/\1/p")"
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if [ -n "$OWNER" ] && [ "$OWNER" != "$SECTION" ]; then
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echo "Error: $MESH_IFNAME is already used by section '$OWNER'." >&2
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echo "Remove it first: fips-mesh-setup remove" >&2
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exit 1
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fi
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# ---------------------------------------------------------------------------
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# Driver capability check (advisory — config below is harmless either way)
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# ---------------------------------------------------------------------------
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if command -v iw >/dev/null 2>&1; then
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if ! iw list 2>/dev/null | grep -q "\* mesh point"; then
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echo "Warning: no radio on this device advertises 'mesh point' support" >&2
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echo "(iw list | grep 'mesh point'). The interface may fail to come up." >&2
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fi
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fi
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# ---------------------------------------------------------------------------
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# Wireless: open 802.11s mesh point, HWMP forwarding off
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# ---------------------------------------------------------------------------
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uci -q delete "wireless.$SECTION"
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uci set "wireless.$SECTION=wifi-iface"
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uci set "wireless.$SECTION.device=$RADIO"
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uci set "wireless.$SECTION.mode=mesh"
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uci set "wireless.$SECTION.mesh_id=$MESH_ID"
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uci set "wireless.$SECTION.encryption=none"
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uci set "wireless.$SECTION.mesh_fwding=0"
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uci set "wireless.$SECTION.ifname=$MESH_IFNAME"
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uci set "wireless.$SECTION.network=$SECTION"
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# Radios ship disabled on fresh OpenWrt installs; a disabled radio would
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# leave the mesh interface down with no error anywhere visible.
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if [ "$(uci -q get "wireless.$RADIO.disabled")" = "1" ]; then
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echo "Note: enabling $RADIO (was disabled)."
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uci -q delete "wireless.$RADIO.disabled"
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fi
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# The mesh inherits the radio's channel, and mesh points only peer on the
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# same channel. 'auto' lets each router pick its own — the classic silent
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# non-peering cause — so surface the setting loudly.
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CHANNEL="$(uci -q get "wireless.$RADIO.channel")"
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BAND="$(uci -q get "wireless.$RADIO.band")"
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if [ -z "$CHANNEL" ] || [ "$CHANNEL" = "auto" ]; then
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echo "Warning: $RADIO channel is '${CHANNEL:-unset}' — each router may" >&2
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echo "auto-select a different channel and mesh points only peer on the" >&2
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echo "same one. Pin the same channel on every backhaul router, e.g.:" >&2
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echo " uci set wireless.$RADIO.channel='36' && uci commit wireless && wifi reload" >&2
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fi
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# A client (sta) interface on the same radio follows its upstream AP's
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# channel and drags every other interface with it — a mesh pinned to a
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# different channel silently never joins, and does not recover when the
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# STA disconnects.
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for s in $(uci show wireless 2>/dev/null | sed -n "s/^wireless\.\([^.]*\)\.mode='sta'$/\1/p"); do
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if [ "$(uci -q get "wireless.$s.device")" = "$RADIO" ]; then
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echo "Warning: $RADIO also carries client interface '$s' (mode 'sta')." >&2
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echo "The whole radio follows that STA's upstream channel — a mesh" >&2
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echo "pinned to a different channel stays down silently. Align the" >&2
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echo "mesh channel with the upstream AP, or put the mesh on a radio" >&2
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echo "without a STA (a roaming uplink is incompatible with a" >&2
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echo "fixed-channel mesh on the same radio)." >&2
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fi
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done
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# ---------------------------------------------------------------------------
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# Network: unmanaged interface so netifd brings the netdev up. No IP config —
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# the FIPS Ethernet transport speaks raw frames on it.
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# ---------------------------------------------------------------------------
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uci -q delete "network.$SECTION"
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uci set "network.$SECTION=interface"
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uci set "network.$SECTION.proto=none"
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uci commit wireless
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uci commit network
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# 'wifi reload' re-applies the whole wireless config, so it briefly drops
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# every client AP on all radios (a few seconds) — expected when adding a mesh.
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wifi reload
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# Enable the matching mesh<N> transport in the shipped fips.yaml (it ships
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# commented out). Tailor the restart hint to what we could do.
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mesh_config_enable "$IDX"
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case $? in
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0) TRANSPORT_NOTE="The mesh$IDX transport in $CONFIG that binds '$MESH_IFNAME' is
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now uncommented and enabled." ;;
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1) TRANSPORT_NOTE="No $CONFIG found — add a transports.ethernet entry binding
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interface '$MESH_IFNAME' by hand." ;;
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*) TRANSPORT_NOTE="No 'mesh$IDX' entry in $CONFIG — add a transports.ethernet
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entry binding interface '$MESH_IFNAME' by hand (copy the mesh0 block)." ;;
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esac
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cat <<EOF
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Created open 802.11s mesh '$MESH_ID' as $MESH_IFNAME on $RADIO \
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(band ${BAND:-?}, channel ${CHANNEL:-auto}).
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ALL routers in this backhaul must share this mesh ID AND channel
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(per band). On a dual-band router, run fips-mesh-setup for the other
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radio too — second band is a standby path (failover, not multipath).
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Next steps:
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1. $TRANSPORT_NOTE
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Restart the daemon AFTER the interface is up — a transport whose
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interface is missing at startup is skipped, not retried:
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/etc/init.d/fips restart
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2. Verify L2 peering with a second FIPS router in range:
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iw dev $MESH_IFNAME station dump
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and the FIPS link on top of it:
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fipsctl show peers
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Run 'fips-mesh-setup remove' to undo all instances, or
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'fips-mesh-setup remove $RADIO' for just this one.
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EOF
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Arjen
Johnathan Corgan