[PATCH bpf-next 0/3] Enable socket lookup in SOCKMAP/SOCKHASH from BPF

[Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>]

This series enables BPF programs to fetch sockets from SOCKMAP/SOCKHASH by
doing a map lookup, as proposed during virtual BPF conference.

Patch 1 description covers changes on verifier side needed to make it work.

Fetched socket can be inspected or passed to helpers such as bpf_sk_assign,
which is demonstrated by the test updated in patch 3.

Thanks,
Jakub

Jakub Sitnicki (3):
  bpf: Allow bpf_map_lookup_elem for SOCKMAP and SOCKHASH
  selftests/bpf: Test that lookup on SOCKMAP/SOCKHASH is allowed
  selftests/bpf: Use SOCKMAP for server sockets in bpf_sk_assign test

 kernel/bpf/verifier.c                         | 45 +++++++---
 net/core/filter.c                             |  4 +
 net/core/sock_map.c                           | 18 +++-
 tools/testing/selftests/bpf/Makefile          |  2 +-
 .../selftests/bpf/prog_tests/sk_assign.c      | 21 ++++-
 .../selftests/bpf/progs/test_sk_assign.c      | 82 ++++++++-----------
 .../bpf/verifier/prevent_map_lookup.c         | 30 -------
 tools/testing/selftests/bpf/verifier/sock.c   | 70 ++++++++++++++++
 8 files changed, 178 insertions(+), 94 deletions(-)

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2.25.3