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hook: fix vlan handling (#238)
#### hook: vlan.sh: fix 'parse_cmdline' bug; if no hw_addr specified, default ifname to eth0 - `parse_cmdline` is actually `parse_kernel_cmdline_for` - no reason to double-newline results - allow for simple vlan_id=xxx without hwaddr for single-interface or first-interface VLAN scenarios Signed-off-by: Ricardo Pardini <ricardo@pardini.net> #### hook: introduce hook-ip container for vlan.sh - Based on linuxkit/ip pkg, sans wireguard stuff; add GNU sed needed for /proc/cmdline parsing Signed-off-by: Ricardo Pardini <ricardo@pardini.net>
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‎bash/hook-lk-containers.sh‎

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@@ -7,6 +7,7 @@ function build_all_hook_linuxkit_containers() {
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# when adding new container builds here you'll also want to add them to the
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# `linuxkit_build` function in the linuxkit.sh file.
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# # NOTE: linuxkit containers must be in the images/ directory
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build_hook_linuxkit_container hook-ip HOOK_CONTAINER_IP_IMAGE
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build_hook_linuxkit_container hook-bootkit HOOK_CONTAINER_BOOTKIT_IMAGE
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build_hook_linuxkit_container hook-docker HOOK_CONTAINER_DOCKER_IMAGE
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build_hook_linuxkit_container hook-mdev HOOK_CONTAINER_MDEV_IMAGE

‎bash/linuxkit.sh‎

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@@ -50,7 +50,7 @@ function linuxkit_build() {
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fi
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# Build the containers in this repo used in the LinuxKit YAML;
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build_all_hook_linuxkit_containers # sets HOOK_CONTAINER_BOOTKIT_IMAGE, HOOK_CONTAINER_DOCKER_IMAGE, HOOK_CONTAINER_MDEV_IMAGE, HOOK_CONTAINER_CONTAINERD_IMAGE
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build_all_hook_linuxkit_containers # sets HOOK_CONTAINER_IP_IMAGE, HOOK_CONTAINER_BOOTKIT_IMAGE, HOOK_CONTAINER_DOCKER_IMAGE, HOOK_CONTAINER_MDEV_IMAGE, HOOK_CONTAINER_CONTAINERD_IMAGE
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# Template the linuxkit configuration file.
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# - You'd think linuxkit would take --build-args or something by now, but no.
@@ -64,12 +64,13 @@ function linuxkit_build() {
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# shellcheck disable=SC2016 # I'm using single quotes to avoid shell expansion, envsubst wants the dollar signs.
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cat "linuxkit-templates/${kernel_info['TEMPLATE']}.template.yaml" |
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HOOK_KERNEL_IMAGE="${kernel_oci_image}" HOOK_KERNEL_ID="${inventory_id}" HOOK_KERNEL_VERSION="${kernel_oci_version}" \
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HOOK_CONTAINER_IP_IMAGE="${HOOK_CONTAINER_IP_IMAGE}" \
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HOOK_CONTAINER_BOOTKIT_IMAGE="${HOOK_CONTAINER_BOOTKIT_IMAGE}" \
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HOOK_CONTAINER_DOCKER_IMAGE="${HOOK_CONTAINER_DOCKER_IMAGE}" \
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HOOK_CONTAINER_MDEV_IMAGE="${HOOK_CONTAINER_MDEV_IMAGE}" \
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HOOK_CONTAINER_CONTAINERD_IMAGE="${HOOK_CONTAINER_CONTAINERD_IMAGE}" \
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HOOK_CONTAINER_RUNC_IMAGE="${HOOK_CONTAINER_RUNC_IMAGE}" \
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envsubst '$HOOK_VERSION $HOOK_KERNEL_IMAGE $HOOK_KERNEL_ID $HOOK_KERNEL_VERSION $HOOK_CONTAINER_BOOTKIT_IMAGE $HOOK_CONTAINER_DOCKER_IMAGE $HOOK_CONTAINER_MDEV_IMAGE $HOOK_CONTAINER_CONTAINERD_IMAGE $HOOK_CONTAINER_RUNC_IMAGE' \
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envsubst '$HOOK_VERSION $HOOK_KERNEL_IMAGE $HOOK_KERNEL_ID $HOOK_KERNEL_VERSION $HOOK_CONTAINER_IP_IMAGE $HOOK_CONTAINER_BOOTKIT_IMAGE $HOOK_CONTAINER_DOCKER_IMAGE $HOOK_CONTAINER_MDEV_IMAGE $HOOK_CONTAINER_CONTAINERD_IMAGE $HOOK_CONTAINER_RUNC_IMAGE' \
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> "hook.${inventory_id}.yaml"
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declare -g linuxkit_bin=""

‎files/vlan.sh‎

Lines changed: 19 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -26,7 +26,7 @@ function parse_kernel_cmdline_for() {
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if [ -z "${result}" ]; then
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return 1
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else
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printf "%s\n" "$result"
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printf "%s" "$result"
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fi
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}
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@@ -43,15 +43,14 @@ function add_vlan_interface() {
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# check if hw_addr are set in the kernel commandline, otherwise return.
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if ! kernel_cmdline_exists hw_addr; then
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echo "No hw_addr=xx:xx:xx:xx:xx:xx set in kernel commandline; no VLAN handling." >&2
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return
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echo "No hw_addr=xx:xx:xx:xx:xx:xx set in kernel commandline." >&2
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fi
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echo "Starting VLAN handling, parsing..." >&2
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declare vlan_id hw_addr
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vlan_id="$(parse_cmdline vlan_id)"
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hw_addr="$(parse_cmdline hw_addr)"
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vlan_id="$(parse_kernel_cmdline_for vlan_id)"
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hw_addr="$(parse_kernel_cmdline_for hw_addr)"
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}'" >&2
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@@ -60,21 +59,23 @@ function add_vlan_interface() {
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', searching for interface..." >&2
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ifname="$(ip -br link | awk '$3 ~ /'"${hw_addr}"'/ {print $1}')"
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', found interface: '${ifname}'" >&2
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if [ -n "$ifname" ]; then
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', adding VLAN interface..." >&2
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ip link set dev "${ifname}" up || true
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ip link add link "${ifname}" name "${ifname}.${vlan_id}" type vlan id "${vlan_id}" || true
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ip link set "${ifname}.${vlan_id}" up || true
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', added VLAN interface: '${ifname}.${vlan_id}'" >&2
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return 0
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else
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', no interface found for hw_addr." >&2
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return 3
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fi
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else
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', no hw_addr found in kernel commandline." >&2
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return 2
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', no hw_addr found in kernel commandline; default ifname to eth0." >&2
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ifname="eth0"
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fi
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if [ -n "$ifname" ]; then
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', adding VLAN interface..." >&2
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ip link set dev "${ifname}" up || true
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ip link add link "${ifname}" name "${ifname}.${vlan_id}" type vlan id "${vlan_id}" || true
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ip link set "${ifname}.${vlan_id}" up || true
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', added VLAN interface: '${ifname}.${vlan_id}'" >&2
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return 0
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else
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', no interface found for hw_addr." >&2
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return 3
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fi
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else
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echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', no vlan_id found in kernel commandline." >&2
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return 1

‎images/hook-ip/Dockerfile‎

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@@ -0,0 +1,23 @@
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FROM linuxkit/alpine:146f540f25cd92ec8ff0c5b0c98342a9a95e479e AS mirror
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RUN mkdir -p /out/etc/apk && cp -r /etc/apk/* /out/etc/apk/
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RUN apk add curl
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RUN apk add --no-cache --initdb -p /out \
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alpine-baselayout \
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bash \
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busybox \
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iproute2 \
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iptables \
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ebtables \
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ipvsadm \
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bridge-utils \
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musl \
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sed
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# Remove apk residuals
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RUN rm -rf /out/etc/apk /out/lib/apk /out/var/cache
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FROM scratch
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ENTRYPOINT []
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CMD []
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WORKDIR /
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COPY --from=mirror /out/ /

‎linuxkit-templates/hook.template.yaml‎

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@@ -3,6 +3,7 @@
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# - HOOK_KERNEL_IMAGE: ${HOOK_KERNEL_IMAGE}
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# - HOOK_KERNEL_ID: ${HOOK_KERNEL_ID}
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# - HOOK_KERNEL_VERSION: ${HOOK_KERNEL_VERSION}
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# - HOOK_CONTAINER_IP_IMAGE: ${HOOK_CONTAINER_IP_IMAGE}
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# - HOOK_CONTAINER_BOOTKIT_IMAGE: ${HOOK_CONTAINER_BOOTKIT_IMAGE}
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# - HOOK_CONTAINER_DOCKER_IMAGE: ${HOOK_CONTAINER_DOCKER_IMAGE}
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# - HOOK_CONTAINER_MDEV_IMAGE: ${HOOK_CONTAINER_MDEV_IMAGE}
@@ -38,7 +39,7 @@ onboot:
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command: [ "modprobe", "cdc_ncm" ] # for usb ethernet dongles
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- name: vlan
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image: linuxkit/ip:v1.0.0
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image: "${HOOK_CONTAINER_IP_IMAGE}"
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capabilities:
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- all
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binds.add:

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