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 deduplicates write_sysctl in BPF test_progs.
Patch 3 adds the tests for this hook.
v1 -> v2:
* Added static to bindaddr_v6 in prog_tests/connect_ping.c
* Deduplicated much of the test logic in prog_tests/connect_ping.c
* Deduplicated write_sysctl() to test_progs.c
v2 -> v3:
* Renamed variable "obj" to "skel" for the BPF skeleton object in
prog_tests/connect_ping.c
v3 -> v4:
* Fixed error path to destroy skel in prog_tests/connect_ping.c
YiFei Zhu (3):
bpf: Invoke cgroup/connect{4,6} programs for unprivileged ICMP ping
selftests/bpf: Deduplicate write_sysctl() to test_progs.c
selftests/bpf: Ensure cgroup/connect{4,6} programs can bind unpriv
ICMP ping
net/ipv4/ping.c | 15 ++
net/ipv6/ping.c | 16 ++
.../bpf/prog_tests/btf_skc_cls_ingress.c | 20 --
.../selftests/bpf/prog_tests/connect_ping.c | 178 ++++++++++++++++++
.../bpf/prog_tests/tcp_hdr_options.c | 20 --
.../selftests/bpf/progs/connect_ping.c | 53 ++++++
tools/testing/selftests/bpf/test_progs.c | 17 ++
tools/testing/selftests/bpf/test_progs.h | 1 +
8 files changed, 280 insertions(+), 40 deletions(-)
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
