[PATCH bpf-next v2 0/3] bpf: Add bpf_ksock_sendto() kfunc

[Mahe Tardy <mahe.tardy@gmail.com>]

This patch series improves the bpf_ksock infrastructure in line with the
work proposed during Prague Plumbers 2026 presentation[^1] by adding
the bpf_ksock_sendto() kfunc to complement the bpf_ksock_send().

This is useful when using ksock to reply to differents peers while
reusing the same UDP socket and generally works toward the goal of ksock
to support the basic socket operations.

[^1]: https://lpc.events/event/20/contributions/2430/

v2 updates:
- remove the LSM verifier filter refinements (alexei)
- remove allowing calling connect() from the send path (alexei)
- change order of the tests patches for signature definition (sashiko)

v1: https://lore.kernel.org/bpf/DM9RCU3BDWEG.1C32ZIVU95S76@gmail.com/

Mahe Tardy (3):
  bpf: add bpf_ksock_sendto() kfunc
  selftests/bpf: Test ksock sendto()
  selftests/bpf: Test forbidden bpf_ksock_sendto() LSM attach

 net/core/bpf_ksock.c                          |  96 +++++++++++-----
 .../selftests/bpf/prog_tests/ksock_sendto.c   | 108 ++++++++++++++++++
 .../selftests/bpf/progs/ksock_common.h        |   2 +
 .../selftests/bpf/progs/ksock_lsm_verifier.c  |  25 +++-
 .../selftests/bpf/progs/ksock_sendto.c        |  59 ++++++++++
 5 files changed, 262 insertions(+), 28 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/ksock_sendto.c
 create mode 100644 tools/testing/selftests/bpf/progs/ksock_sendto.c

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2.43.0