bpf: split eBPF out of NET
introduce two configs: - hidden CONFIG_BPF to select eBPF interpreter that classic socket filters depend on - visible CONFIG_BPF_SYSCALL (default off) that tracing and sockets can use that solves several problems: - tracing and others that wish to use eBPF don't need to depend on NET. They can use BPF_SYSCALL to allow loading from userspace or select BPF to use it directly from kernel in NET-less configs. - in 3.18 programs cannot be attached to events yet, so don't force it on - when the rest of eBPF infra is there in 3.19+, it's still useful to switch it off to minimize kernel size bloat-o-meter on x64 shows: add/remove: 0/60 grow/shrink: 0/2 up/down: 0/-15601 (-15601) tested with many different config combinations. Hopefully didn't miss anything. Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Acked-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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5 changed files with 28 additions and 5 deletions
14
init/Kconfig
14
init/Kconfig
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@ -1341,6 +1341,10 @@ config SYSCTL_ARCH_UNALIGN_ALLOW
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config HAVE_PCSPKR_PLATFORM
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bool
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# interpreter that classic socket filters depend on
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config BPF
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bool
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menuconfig EXPERT
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bool "Configure standard kernel features (expert users)"
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# Unhide debug options, to make the on-by-default options visible
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@ -1521,6 +1525,16 @@ config EVENTFD
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If unsure, say Y.
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# syscall, maps, verifier
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config BPF_SYSCALL
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bool "Enable bpf() system call" if EXPERT
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select ANON_INODES
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select BPF
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default n
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help
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Enable the bpf() system call that allows to manipulate eBPF
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programs and maps via file descriptors.
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config SHMEM
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bool "Use full shmem filesystem" if EXPERT
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default y
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@ -86,7 +86,7 @@ obj-$(CONFIG_RING_BUFFER) += trace/
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obj-$(CONFIG_TRACEPOINTS) += trace/
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obj-$(CONFIG_IRQ_WORK) += irq_work.o
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obj-$(CONFIG_CPU_PM) += cpu_pm.o
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obj-$(CONFIG_NET) += bpf/
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obj-$(CONFIG_BPF) += bpf/
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obj-$(CONFIG_PERF_EVENTS) += events/
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@ -1,5 +1,5 @@
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obj-y := core.o syscall.o verifier.o
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obj-y := core.o
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obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o
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ifdef CONFIG_TEST_BPF
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obj-y += test_stub.o
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obj-$(CONFIG_BPF_SYSCALL) += test_stub.o
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endif
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@ -655,3 +655,12 @@ void bpf_prog_free(struct bpf_prog *fp)
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schedule_work(&aux->work);
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}
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EXPORT_SYMBOL_GPL(bpf_prog_free);
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/* To execute LD_ABS/LD_IND instructions __bpf_prog_run() may call
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* skb_copy_bits(), so provide a weak definition of it for NET-less config.
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*/
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int __weak skb_copy_bits(const struct sk_buff *skb, int offset, void *to,
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int len)
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{
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return -EFAULT;
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}
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@ -6,7 +6,7 @@ menuconfig NET
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bool "Networking support"
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select NLATTR
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select GENERIC_NET_UTILS
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select ANON_INODES
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select BPF
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---help---
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Unless you really know what you are doing, you should say Y here.
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The reason is that some programs need kernel networking support even
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