Enable dummy netdev and TC BPF kernel options

Description

I’m trying to run networking software inside an exe.dev VM that needs to:

create a dummy network interface
attach TC/eBPF programs to interface ingress/egress hooks

The VM has general eBPF support enabled, but appears to be missing a few networking-specific kernel options.

Environment

uname -r: 6.12.93

Commands used to check

uname -r

zgrep -E 'CONFIG_BPF|CONFIG_BPF_JIT|CONFIG_KPROBES|CONFIG_UPROBES|CONFIG_TRACEPOINTS|CONFIG_FTRACE|CONFIG_NET_CLS_BPF|CONFIG_NET_ACT_BPF|CONFIG_DUMMY' /proc/config.gz

Current kernel config

General eBPF features appear to be enabled:

CONFIG_BPF=y
CONFIG_BPF_SYSCALL=y
CONFIG_BPF_JIT=y
CONFIG_BPF_JIT_DEFAULT_ON=y
CONFIG_TRACEPOINTS=y
CONFIG_KPROBES=y
CONFIG_KPROBES_ON_FTRACE=y
CONFIG_UPROBES=y
CONFIG_FTRACE=y
CONFIG_BPF_EVENTS=y

But these required networking features are missing:

# CONFIG_NET_CLS_BPF is not set
# CONFIG_NET_ACT_BPF is not set
# CONFIG_DUMMY is not set

Reproduction

Creating a dummy interface fails:

sudo ip link add testdummy0 type dummy

Result:

Error: Unknown device type.

Trying to load the dummy module also fails:

sudo modprobe dummy

Result:

modprobe: FATAL: Module dummy not found in directory /lib/modules/6.12.93

A veth interface can be created, but TC/eBPF attachment is still blocked because CONFIG_NET_CLS_BPF / CONFIG_NET_ACT_BPF are not enabled.

Request

Could exe.dev enable these kernel options, either built-in or as modules?

CONFIG_DUMMY=y or m
CONFIG_NET_CLS_BPF=y or m
CONFIG_NET_ACT_BPF=y or m

This would allow workloads to create dummy network devices and attach TC/eBPF programs to network interfaces.

Related issues

This is related to, but more specific than:

Issue #127 enabled broader eBPF support, and that does appear to be working. This request is specifically for TC networking BPF support and dummy netdev support.