# SPDX-License-Identifier: GPL-2.0-only

# BPF interpreter that, for example, classic socket filters depend on.
config BPF
	bool

# Used by archs to tell that they support BPF JIT compiler plus which
# flavour. Only one of the two can be selected for a specific arch since
# eBPF JIT supersedes the cBPF JIT.

# Classic BPF JIT (cBPF)
config HAVE_CBPF_JIT
	bool

# Extended BPF JIT (eBPF)
config HAVE_EBPF_JIT
	bool

# Used by archs to tell that they want the BPF JIT compiler enabled by
# default for kernels that were compiled with BPF JIT support.
config ARCH_WANT_DEFAULT_BPF_JIT
	bool

menu "BPF subsystem"

config BPF_SYSCALL
	bool "Enable bpf() system call"
	select BPF
	select IRQ_WORK
	select TASKS_RCU if PREEMPTION
	select TASKS_TRACE_RCU
	select BINARY_PRINTF
	select NET_SOCK_MSG if NET
	select NET_XGRESS if NET
	select PAGE_POOL if NET
	default n
	help
	  Enable the bpf() system call that allows to manipulate BPF programs
	  and maps via file descriptors.

config BPF_JIT
	bool "Enable BPF Just In Time compiler"
	depends on BPF
	depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT
	depends on MODULES
	help
	  BPF programs are normally handled by a BPF interpreter. This option
	  allows the kernel to generate native code when a program is loaded
	  into the kernel. This will significantly speed-up processing of BPF
	  programs.

	  Note, an admin should enable this feature changing:
	  /proc/sys/net/core/bpf_jit_enable
	  /proc/sys/net/core/bpf_jit_harden   (optional)
	  /proc/sys/net/core/bpf_jit_kallsyms (optional)

config BPF_JIT_ALWAYS_ON
	bool "Permanently enable BPF JIT and remove BPF interpreter"
	depends on BPF_SYSCALL && HAVE_EBPF_JIT && BPF_JIT
	help
	  Enables BPF JIT and removes BPF interpreter to avoid speculative
	  execution of BPF instructions by the interpreter.

	  When CONFIG_BPF_JIT_ALWAYS_ON is enabled, /proc/sys/net/core/bpf_jit_enable
	  is permanently set to 1 and setting any other value than that will
	  return failure.

config BPF_JIT_DEFAULT_ON
	def_bool ARCH_WANT_DEFAULT_BPF_JIT || BPF_JIT_ALWAYS_ON
	depends on HAVE_EBPF_JIT && BPF_JIT

config BPF_UNPRIV_DEFAULT_OFF
	bool "Disable unprivileged BPF by default"
	default y
	depends on BPF_SYSCALL
	help
	  Disables unprivileged BPF by default by setting the corresponding
	  /proc/sys/kernel/unprivileged_bpf_disabled knob to 2. An admin can
	  still reenable it by setting it to 0 later on, or permanently
	  disable it by setting it to 1 (from which no other transition to
	  0 is possible anymore).

	  Unprivileged BPF could be used to exploit certain potential
	  speculative execution side-channel vulnerabilities on unmitigated
	  affected hardware.

	  If you are unsure how to answer this question, answer Y.

source "kernel/bpf/preload/Kconfig"

config BPF_LSM
	bool "Enable BPF LSM Instrumentation"
	depends on BPF_EVENTS
	depends on BPF_SYSCALL
	depends on SECURITY
	depends on BPF_JIT
	help
	  Enables instrumentation of the security hooks with BPF programs for
	  implementing dynamic MAC and Audit Policies.

	  If you are unsure how to answer this question, answer N.

config BPF_SCHED
	bool "Sched Instrumentation with BPF"
	depends on BPF_EVENTS
	depends on BPF_SYSCALL
	depends on BPF_JIT
	help
	  Enables instrumentation of the sched hooks with eBPF programs for
	  implementing dynamic scheduling policies. When CONFIG_BPF_SCHED
	  is enabled, privileged BPF could be used to expand scheduling
	  capabilities.

	  If you are unsure how to answer this question, answer N.

endmenu # "BPF subsystem"