This series adds two BPF helpers, that is, one for retrieving the classid of an skb and another one to redirect via the neigh subsystem, and improves also the cookie helpers by removing the atomic counter. I've also added the bpf_tail_call_static() helper to the libbpf API that we've been using in Cilium for a while now, and last but not least the series adds a few selftests. For details, please check individual patches, thanks! v2 -> v3: - Removed double skb->dev = dev assignment (David) - Added headroom check for v6 path (David) - Set set flowi4_proto for ip_route_output_flow (David) - Rebased onto latest bpf-next v1 -> v2: - Rework cookie generator to support nested contexts (Eric) - Use ip_neigh_gw6() and container_of() (David) - Rename __throw_build_bug() and improve comments (Andrii) - Use bpf_tail_call_static() also in BPF samples (Maciej) Daniel Borkmann (6): bpf: add classid helper only based on skb->sk bpf, net: rework cookie generator as per-cpu one bpf: add redirect_neigh helper as redirect drop-in bpf, libbpf: add bpf_tail_call_static helper for bpf programs bpf, selftests: use bpf_tail_call_static where appropriate bpf, selftests: add redirect_neigh selftest include/linux/cookie.h | 51 +++ include/linux/skbuff.h | 5 + include/linux/sock_diag.h | 14 +- include/net/net_namespace.h | 2 +- include/uapi/linux/bpf.h | 24 ++ kernel/bpf/reuseport_array.c | 2 +- net/core/filter.c | 304 ++++++++++++++++-- net/core/net_namespace.c | 9 +- net/core/sock_diag.c | 9 +- net/core/sock_map.c | 4 +- samples/bpf/sockex3_kern.c | 20 +- tools/include/uapi/linux/bpf.h | 24 ++ tools/lib/bpf/bpf_helpers.h | 46 +++ tools/testing/selftests/bpf/progs/bpf_flow.c | 12 +- tools/testing/selftests/bpf/progs/tailcall1.c | 28 +- tools/testing/selftests/bpf/progs/tailcall2.c | 14 +- tools/testing/selftests/bpf/progs/tailcall3.c | 4 +- .../selftests/bpf/progs/tailcall_bpf2bpf1.c | 4 +- .../selftests/bpf/progs/tailcall_bpf2bpf2.c | 6 +- .../selftests/bpf/progs/tailcall_bpf2bpf3.c | 6 +- .../selftests/bpf/progs/tailcall_bpf2bpf4.c | 6 +- .../selftests/bpf/progs/test_tc_neigh.c | 144 +++++++++ tools/testing/selftests/bpf/test_tc_neigh.sh | 168 ++++++++++ 23 files changed, 826 insertions(+), 80 deletions(-) create mode 100644 include/linux/cookie.h create mode 100644 tools/testing/selftests/bpf/progs/test_tc_neigh.c create mode 100755 tools/testing/selftests/bpf/test_tc_neigh.sh -- 2.21.0
