[bpf-next,0/2] Add support for bpf_setsockopt and bpf_getsockopt from BPF setsockopt

Message

Prankur gupta Aug. 16, 2021, 11:17 p.m. UTC

This patch contains support to set and get socket options from setsockopt
bpf program.
This enables us to set multiple socket option when the user changes a
particular socket option.
Example use case, 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.

Prankur gupta (2):
  bpf: Add support for {set|get} socket options from setsockopt BPF
  selftests/bpf: Add test for {set|get} socket option from setsockopt
    BPF program

 kernel/bpf/cgroup.c                           |  8 +++
 tools/testing/selftests/bpf/bpf_tcp_helpers.h | 18 +++++
 .../bpf/prog_tests/sockopt_qos_to_cc.c        | 70 +++++++++++++++++++
 .../selftests/bpf/progs/sockopt_qos_to_cc.c   | 39 +++++++++++
 4 files changed, 135 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/sockopt_qos_to_cc.c
 create mode 100644 tools/testing/selftests/bpf/progs/sockopt_qos_to_cc.c