bpf: Add support for {set|get} socket options from setsockopt BPF

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Add logic to call bpf_setsockopt() and bpf_getsockopt() from setsockopt BPF
programs. An example use case is when the user sets the IPV6_TCLASS socket
option, we would also like to change the tcp-cc for that socket.

We don't have any use case for calling bpf_setsockopt() from supposedly read-
only sys_getsockopt(), so it is made available to BPF_CGROUP_SETSOCKOPT only
at this point.

Signed-off-by: Prankur Gupta <prankgup@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20210817224221.3257826-2-prankgup@fb.com

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Prankur Gupta 2021-08-17 15:42:20 -07:00 • committed by Daniel Borkmann

parent 44779a4b85

commit 2c531639de

1 changed files with 8 additions and 0 deletions

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kernel/bpf/cgroup.c

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