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
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2.37.2.789.g6183377224-goog
