This series implements two new per-cgroup hooks: getsockopt and
setsockopt along with a new sockopt program type. The idea is pretty
similar to recently introduced cgroup sysctl hooks, but
implementation is simpler (no need to convert to/from strings).
What this can be applied to:
* move business logic of what tos/priority/etc can be set by
containers (either pass or reject)
* handle existing options (or introduce new ones) differently by
propagating some information in cgroup/socket local storage
Compared to a simple syscall/{g,s}etsockopt tracepoint, those
hooks are context aware. Meaning, they can access underlying socket
and use cgroup and socket local storage.
v6:
* rework cgroup chaining; stop as soon as bpf program returns
0 or 2; see patch with the documentation for the details
Stanislav Fomichev (9):
bpf: implement getsockopt and setsockopt hooks
bpf: sync bpf.h to tools/
libbpf: support sockopt hooks
selftests/bpf: test sockopt section name
selftests/bpf: add sockopt test
selftests/bpf: add sockopt test that exercises sk helpers
selftests/bpf: add sockopt test that exercises BPF_F_ALLOW_MULTI
bpf: add sockopt documentation
bpftool: support cgroup sockopt
Documentation/bpf/index.rst | 1 +
Documentation/bpf/prog_cgroup_sockopt.rst | 72 ++
include/linux/bpf-cgroup.h | 29 +
include/linux/bpf.h | 46 ++
include/linux/bpf_types.h | 1 +
include/linux/filter.h | 13 +
include/uapi/linux/bpf.h | 13 +
kernel/bpf/cgroup.c | 260 ++++++
kernel/bpf/core.c | 9 +
kernel/bpf/syscall.c | 19 +
kernel/bpf/verifier.c | 15 +
net/core/filter.c | 2 +-
net/socket.c | 18 +
.../bpftool/Documentation/bpftool-cgroup.rst | 7 +-
.../bpftool/Documentation/bpftool-prog.rst | 2 +-
tools/bpf/bpftool/bash-completion/bpftool | 8 +-
tools/bpf/bpftool/cgroup.c | 5 +-
tools/bpf/bpftool/main.h | 1 +
tools/bpf/bpftool/prog.c | 3 +-
tools/include/uapi/linux/bpf.h | 14 +
tools/lib/bpf/libbpf.c | 5 +
tools/lib/bpf/libbpf_probes.c | 1 +
tools/testing/selftests/bpf/.gitignore | 3 +
tools/testing/selftests/bpf/Makefile | 6 +-
.../testing/selftests/bpf/progs/sockopt_sk.c | 82 ++
.../selftests/bpf/test_section_names.c | 10 +
tools/testing/selftests/bpf/test_sockopt.c | 773 ++++++++++++++++++
.../selftests/bpf/test_sockopt_multi.c | 264 ++++++
tools/testing/selftests/bpf/test_sockopt_sk.c | 185 +++++
29 files changed, 1857 insertions(+), 10 deletions(-)
create mode 100644 Documentation/bpf/prog_cgroup_sockopt.rst
create mode 100644 tools/testing/selftests/bpf/progs/sockopt_sk.c
create mode 100644 tools/testing/selftests/bpf/test_sockopt.c
create mode 100644 tools/testing/selftests/bpf/test_sockopt_multi.c
create mode 100644 tools/testing/selftests/bpf/test_sockopt_sk.c
--
2.22.0.410.gd8fdbe21b5-goog
