Add IPv6 PxE support

[rikka0w0]

Add the missing feature mentioned in #99.

New config in /etc/config/dhcp:

config boot6
        option url 'tftp://[fd2b:dca9:fd11::1]/ipxe_x86_64.efi'
        option arch '7'

config boot6
        option url 'tftp://[fd2b:dca9:fd11::1]/ipxe_default.bin'

The patched odhcpd will send IPv6 PxE URLs in the Advertise message, according to the arch code specified in the Solicit message from the client.

The debugging procedure is similar to: USE_SOURCE_DIR

Workspace setup:

git clone [email protected]:rikka0w0/odhcpd.git
git clone https://github.com/openwrt/openwrt.git
ln -s odhcpd/.git openwrt/package/network/services/odhcpd/git-src
cd openwrt
make tools/compile -j32
make toolchain/compile -j32

Compile:

git add -A
git commit --amend --no-edit --allow-empty
make package/network/services/odhcpd/{clean,compile} -j32

Capture DHCPv6 packets on OpenWrt device:
tcpdump -i br-lan.1 'port 547' -v -n -w pxe.pcap

Binaries are:

bin/packages/x86_64/base/odhcpd_2023-10-24-d8118f6e-1_x86_64.ipk
build_dir/target-x86_64_musl/odhcpd-ipv6only/odhcpd-2023-10-24-d8118f6e/odhcpd

Build from SDK (A LOT faster)

#!/bin/sh

wget -O openwrt-sdk.tar.xz https://mirrors.cicku.me/openwrt/releases/23.05.5/targets/x86/64/openwrt-sdk-23.05.5-x86-64_gcc-12.3.0_musl.Linux-x86_64.tar.xz
tar xf openwrt-sdk.tar.xz
rm openwrt-sdk.tar.xz
cd openwrt-sdk*
SDK_DIR=$(pwd)

sed -i -E 's~https://git\.openwrt\.org/[A-Za-z]+/([^.]+)\.git~https://github.com/openwrt/\1.git~g' feeds.conf.default
./scripts/feeds update base
./scripts/feeds install -a -p base


MAKEFILE="package/feeds/base/odhcpd/Makefile"
# Replace PKG_SOURCE_URL line
sed -i 's|^PKG_SOURCE_URL=.*|PKG_SOURCE_URL=https://github.com/rikka0w0/odhcpd.git|' "$MAKEFILE"

# Update PKG_SOURCE_DATE
sed -i 's|\(PKG_SOURCE_DATE:=\).*|\12025-01-06|' "$MAKEFILE"

# Update PKG_SOURCE_VERSION
sed -i 's|\(PKG_SOURCE_VERSION:=\).*|\1e0c6642e306ac4cfae879660b0acb901552f16d3|' "$MAKEFILE"

# Update PKG_MIRROR_HASH
sed -i 's|\(PKG_MIRROR_HASH:=\).*|\1361efbf7110601e769ceed5c74b2e9f663b2fe265e6fb39c9fa2fc83a0b2b406|' "$MAKEFILE"

make defconfig
make package/feeds/base/odhcpd/{clean,download,compile} -j$(nproc)

ls bin/packages/x86_64/base/odhcpd*

[dedeckeh]

Squash the different commits into one commit and add your SoB to the patch (see also https://openwrt.org/submitting-patches)

[rikka0w0]

Squash the different commits into one commit and add your SoB to the patch (see also https://openwrt.org/submitting-patches)

I have squashed the commit and signed it.