[bpf-next,0/2] cgroup/connect{4,6} programs for unprivileged ICMP ping

Message

YiFei Zhu Sept. 1, 2022, 7:15 p.m. UTC

Usually when a TCP/UDP connection is initiated, we can bind the socket
to a specific IP attached to an interface in a cgroup/connect hook.
But for pings, this is impossible, as the hook is not being called.

This series adds the invocation for cgroup/connect{4,6} programs to
unprivileged ICMP ping (i.e. ping sockets created with SOCK_DGRAM
IPPROTO_ICMP(V6) as opposed to SOCK_RAW). This also adds a test to
verify that the hooks are being called and invoking bpf_bind() from
within the hook actually binds the socket.

Patch 1 adds the invocation of the hook. Patch 2 adds the tests.

YiFei Zhu (2):
  bpf: Invoke cgroup/connect{4,6} programs for unprivileged ICMP ping
  selftests/bpf: Ensure cgroup/connect{4,6} programs can bind unpriv
    ICMP ping

 net/ipv4/ping.c                               |  15 +
 net/ipv6/ping.c                               |  16 +
 .../selftests/bpf/prog_tests/connect_ping.c   | 318 ++++++++++++++++++
 .../selftests/bpf/progs/connect_ping.c        |  53 +++
 4 files changed, 402 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/connect_ping.c
 create mode 100644 tools/testing/selftests/bpf/progs/connect_ping.c