bpf: Annotate context types

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Annotate BPF program context types with program-side type and kernel-side type.
This type information is used by the verifier. btf_get_prog_ctx_type() is
used in the later patches to verify that BTF type of ctx in BPF program matches to
kernel expected ctx type. For example, the XDP program type is:
BPF_PROG_TYPE(BPF_PROG_TYPE_XDP, xdp, struct xdp_md, struct xdp_buff)
That means that XDP program should be written as:
int xdp_prog(struct xdp_md *ctx) { ... }

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20191114185720.1641606-16-ast@kernel.org

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Alexei Starovoitov 2019-11-14 10:57:15 -08:00 • committed by Daniel Borkmann

parent 9cc31b3a09

commit 91cc1a9974

6 changed files with 176 additions and 43 deletions

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11

include/linux/bpf.h

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78

include/linux/bpf_types.h

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114

kernel/bpf/btf.c

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4

kernel/bpf/syscall.c

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2

kernel/bpf/verifier.c

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10

net/core/filter.c

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