selftests/bpf: Use bpf_{btf,link,map,prog}_get_info_by_fd()

Use the new type-safe wrappers around bpf_obj_get_info_by_fd().
Fix a prog/map mixup in prog_holds_map().

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230214231221.249277-6-iii@linux.ibm.com

selftests/bpf: Initialize tc in xdp_synproxy

xdp_synproxy/xdp fails in CI with:

Error: bpf_tc_hook_create: File exists

The XDP version of the test should not be calling bpf_tc_hook_create();
the reason it's happening anyway is that if we don't specify --tc on the
command line, tc variable remains uninitialized.

Fixes: 784d5dc0efc2 ("selftests/bpf: Add selftests for raw syncookie helpers in TC mode")
Reported-by: Alexei Starovoitov <ast@kernel.org>
Reported-by: Joanne Koong <joannelkoong@gmail.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20230202235335.3403781-1-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

selftests/bpf: Fix xdp_synproxy compilation failure in 32-bit arch

xdp_synproxy fails to be compiled in the 32-bit arch, log is as follows:

xdp_synproxy.c: In function 'parse_options':
xdp_synproxy.c:175:36: error: left shift count >= width of type [-Werror=shift-count-overflow]
175 | *tcpipopts = (mss6 << 32) | (ttl << 24) | (wscale << 16) | mss4;
| ^~
xdp_synproxy.c: In function 'syncookie_open_bpf_maps':
xdp_synproxy.c:289:28: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
289 | .map_ids = (__u64)map_ids,
| ^

Fix it.

Fixes: fb5cd0ce70d4 ("selftests/bpf: Add selftests for raw syncookie helpers")
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20221111030836.37632-1-yangjihong1@huawei.com

selftests/bpf: Store BPF object files with .bpf.o extension

BPF object files are, in a way, the final artifact produced as part of
the ahead-of-time compilation process. That makes them somewhat special
compared to "regular" object files, which are a intermediate build
artifacts that can typically be removed safely. As such, it can make
sense to name them differently to make it easier to spot this difference
at a glance.

Among others, libbpf-bootstrap [0] has established the extension .bpf.o
for BPF object files. It seems reasonable to follow this example and
establish the same denomination for selftest build artifacts. To that
end, this change adjusts the corresponding part of the build system and
the test programs loading BPF object files to work with .bpf.o files.

[0] https://github.com/libbpf/libbpf-bootstrap

Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Müller <deso@posteo.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220901222253.1199242-1-deso@posteo.net

selftests/bpf: Add selftests for raw syncookie helpers in TC mode

This commit extends selftests for the new BPF helpers
bpf_tcp_raw_{gen,check}_syncookie_ipv{4,6} to also test the TC BPF
functionality added in the previous commit.

Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20220615134847.3753567-7-maximmi@nvidia.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

selftests/bpf: Add selftests for raw syncookie helpers

This commit adds selftests for the new BPF helpers:
bpf_tcp_raw_{gen,check}_syncookie_ipv{4,6}.

xdp_synproxy_kern.c is a BPF program that generates SYN cookies on
allowed TCP ports and sends SYNACKs to clients, accelerating synproxy
iptables module.

xdp_synproxy.c is a userspace control application that allows to
configure the following options in runtime: list of allowed ports, MSS,
window scale, TTL.

A selftest is added to prog_tests that leverages the above programs to
test the functionality of the new helpers.

Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20220615134847.3753567-5-maximmi@nvidia.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>