bpf: minimal support for programs hooked into netfilter framework

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This adds minimal support for BPF_PROG_TYPE_NETFILTER bpf programs
that will be invoked via the NF_HOOK() points in the ip stack.

Invocation incurs an indirect call.  This is not a necessity: Its
possible to add 'DEFINE_BPF_DISPATCHER(nf_progs)' and handle the
program invocation with the same method already done for xdp progs.

This isn't done here to keep the size of this chunk down.

Verifier restricts verdicts to either DROP or ACCEPT.

Signed-off-by: Florian Westphal <fw@strlen.de>
Link: https://lore.kernel.org/r/20230421170300.24115-3-fw@strlen.de
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Florian Westphal 2023-04-21 19:02:55 +02:00 • committed by Alexei Starovoitov

parent 84601d6ee6

commit fd9c663b9a

6 changed files with 88 additions and 1 deletions

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4

include/linux/bpf_types.h

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5

include/net/netfilter/nf_bpf_link.h

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6

kernel/bpf/btf.c

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3

kernel/bpf/verifier.c

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1

net/core/filter.c

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70

net/netfilter/nf_bpf_link.c

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