This set allows networking prog type to directly read fields from
the in-kernel socket type, e.g. "struct tcp_sock".
Patch 2 has the details on the use case.
v3:
- ARG_PTR_TO_SOCK_COMMON_OR_NULL was attempted in v2. The _OR_NULL was
needed because the PTR_TO_BTF_ID could be NULL but note that a could be NULL
PTR_TO_BTF_ID is not a scalar NULL to the verifier. "_OR_NULL" implicitly
gives an expectation that the helper can take a scalar NULL which does
not make sense in most (except one) helpers. Passing scalar NULL
should be rejected at the verification time.
Thus, this patch uses ARG_PTR_TO_BTF_ID_SOCK_COMMON to specify that the
helper can take both the btf-id ptr or the legacy PTR_TO_SOCK_COMMON but
not scalar NULL. It requires the func_proto to explicitly specify the
arg_btf_id such that there is a very clear expectation that the helper
can handle a NULL PTR_TO_BTF_ID.
v2:
- Add ARG_PTR_TO_SOCK_COMMON_OR_NULL (Lorenz)
Martin KaFai Lau (11):
bpf: Move the PTR_TO_BTF_ID check to check_reg_type()
bpf: Enable bpf_skc_to_* sock casting helper to networking prog type
bpf: Change bpf_sk_release and bpf_sk_*cgroup_id to accept
ARG_PTR_TO_BTF_ID_SOCK_COMMON
bpf: Change bpf_sk_storage_*() to accept ARG_PTR_TO_BTF_ID_SOCK_COMMON
bpf: Change bpf_tcp_*_syncookie to accept
ARG_PTR_TO_BTF_ID_SOCK_COMMON
bpf: Change bpf_sk_assign to accept ARG_PTR_TO_BTF_ID_SOCK_COMMON
bpf: selftest: Add ref_tracking verifier test for bpf_skc casting
bpf: selftest: Move sock_fields test into test_progs
bpf: selftest: Adapt sock_fields test to use skel and global variables
bpf: selftest: Use network_helpers in the sock_fields test
bpf: selftest: Use bpf_skc_to_tcp_sock() in the sock_fields test
include/linux/bpf.h | 1 +
include/net/bpf_sk_storage.h | 2 -
include/uapi/linux/bpf.h | 1 +
kernel/bpf/bpf_lsm.c | 4 +-
kernel/bpf/verifier.c | 93 ++--
net/core/bpf_sk_storage.c | 31 +-
net/core/filter.c | 112 ++--
net/ipv4/bpf_tcp_ca.c | 23 +-
tools/include/uapi/linux/bpf.h | 1 +
tools/testing/selftests/bpf/Makefile | 2 +-
.../selftests/bpf/prog_tests/sock_fields.c | 361 +++++++++++++
..._sock_fields_kern.c => test_sock_fields.c} | 165 +++---
.../testing/selftests/bpf/test_sock_fields.c | 482 ------------------
.../selftests/bpf/verifier/ref_tracking.c | 47 ++
14 files changed, 633 insertions(+), 692 deletions(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/sock_fields.c
rename tools/testing/selftests/bpf/progs/{test_sock_fields_kern.c => test_sock_fields.c} (61%)
delete mode 100644 tools/testing/selftests/bpf/test_sock_fields.c
--
2.24.1
