[PATCH bpf-next 0/3] add TCP_BPF_SOCK_OPS_CB_FLAGS to bpf_*sockopt()

Alan Maguire
2024-08-02T15:30:04Z

As previously discussed here [1], long-lived sockets can miss
a chance to set additional callbacks if a sock ops program
was not attached early in their lifetime. Adding support
to bpf_setsockopt() to set callback flags (and bpf_getsockopt()
to retrieve them) provides other opportunities to enable callbacks,
either directly via a cgroup/setsockopt intercepted setsockopt()
or via a socket iterator.

Patch 1 adds bpf_[get|set]sockopt() support; patch 2 adds testing
for it via sockops and cgroup/setsockopt programs and patch 3
extends the existing bpf_iter_setsockopt test to cover setting
sock ops flags via bpf_setsockopt() in iterator context.

[1] https://lore.kernel.org/bpf/f42f157b-6e52-dd4d-3d97-9b86c84c0b00@oracle.com/

Alan Maguire (3):
bpf/bpf_get,set_sockopt: add option to set TCP-BPF sock ops flags
selftests/bpf: add tests for TCP_BPF_SOCK_OPS_CB_FLAGS
selftests/bpf: modify bpf_iter_setsockopt to test
TCP_BPF_SOCK_OPS_CB_FLAGS

include/uapi/linux/bpf.h | 3 +-
net/core/filter.c | 16 ++++
tools/include/uapi/linux/bpf.h | 3 +-
.../bpf/prog_tests/bpf_iter_setsockopt.c | 83 +++++++++++++------
.../selftests/bpf/prog_tests/setget_sockopt.c | 11 +++
.../selftests/bpf/progs/bpf_iter_setsockopt.c | 76 ++++++++++++++---
.../selftests/bpf/progs/setget_sockopt.c | 37 ++++++++-
7 files changed, 188 insertions(+), 41 deletions(-)

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2.31.1