bpf: Use a table to drive helper arg type checks

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The mapping between bpf_arg_type and bpf_reg_type is encoded in a big
hairy if statement that is hard to follow. The debug output also leaves
to be desired: if a reg_type doesn't match we only print one of the
options, instead printing all the valid ones.

Convert the if statement into a table which is then used to drive type
checking. If none of the reg_types match we print all options, e.g.:

    R2 type=rdonly_buf expected=fp, pkt, pkt_meta, map_value

Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200921121227.255763-12-lmb@cloudflare.com

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Lorenz Bauer 2020-09-21 13:12:27 +01:00 • committed by Alexei Starovoitov

parent fd1b0d604c

commit f79e7ea571

2 changed files with 110 additions and 74 deletions

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1

include/linux/bpf.h

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183

kernel/bpf/verifier.c

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