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

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
This commit is contained in:
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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8
kernel/bpf/cgroup.c
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@ -1873,6 +1873,14 @@ cg_sockopt_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_sk_storage_get_proto;
case BPF_FUNC_sk_storage_delete:
return &bpf_sk_storage_delete_proto;
case BPF_FUNC_setsockopt:
if (prog->expected_attach_type == BPF_CGROUP_SETSOCKOPT)
return &bpf_sk_setsockopt_proto;
return NULL;
case BPF_FUNC_getsockopt:
if (prog->expected_attach_type == BPF_CGROUP_SETSOCKOPT)
return &bpf_sk_getsockopt_proto;
return NULL;
#endif
#ifdef CONFIG_INET
case BPF_FUNC_tcp_sock: