bpf: selftests: Move xfrm tunnel test to test_progs

test_progs is better than a shell script b/c C is a bit easier to
maintain than shell. Also it's easier to use new infra like memory
mapped global variables from C via bpf skeleton.

Co-developed-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Antony Antony <antony.antony@secunet.com>
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Link: https://lore.kernel.org/r/a350db9e08520c64544562d88ec005a039124d9b.1702593901.git.dxu@dxuuu.xyz
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

selftests/bpf: use canonical ftrace path

The canonical location for the tracefs filesystem is at
/sys/kernel/tracing.

But, from Documentation/trace/ftrace.rst:

Before 4.1, all ftrace tracing control files were within the debugfs
file system, which is typically located at /sys/kernel/debug/tracing.
For backward compatibility, when mounting the debugfs file system,
the tracefs file system will be automatically mounted at:

/sys/kernel/debug/tracing

Many tests in the bpf selftest code still refer to this older debugfs
path, so let's update them to avoid confusion.

Signed-off-by: Ross Zwisler <zwisler@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20230313205628.1058720-3-zwisler@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

selftests/bpf: Add BPF_F_NO_TUNNEL_KEY test

This patch adds a selftest simulating a GRE sender and receiver using
tunnel headers without tunnel keys. It validates if packets encapsulated
using BPF_F_NO_TUNNEL_KEY are decapsulated by a GRE receiver not
configured with tunnel keys.

Signed-off-by: Christian Ehrig <cehrig@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/bpf/20221218051734.31411-2-cehrig@cloudflare.com

selftests/bpf: fix missing BPF object files

After commit afef88e65554 ("selftests/bpf: Store BPF object files with
.bpf.o extension"), we should use *.bpf.o instead of *.o.

In addition, use the BPF_FILE variable to save the BPF object file name,
which can be better identified and modified.

Fixes: afef88e65554 ("selftests/bpf: Store BPF object files with .bpf.o extension")
Signed-off-by: Wang Yufen <wangyufen@huawei.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/1666235134-562-1-git-send-email-wangyufen@huawei.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

selftests/bpf: Move vxlan tunnel testcases to test_progs

Move vxlan tunnel testcases from test_tunnel.sh to test_progs.
And add vxlan tunnel source testcases also. Other tunnel testcases
will be moved to test_progs step by step in the future.
Rename bpf program section name as SEC("tc") because test_progs
bpf loader could not load sections with name SEC("gre_set_tunnel").
Because of this, add bpftool to load bpf programs in test_tunnel.sh.

Signed-off-by: Kaixi Fan <fankaixi.li@bytedance.com>
Link: https://lore.kernel.org/r/20220430074844.69214-3-fankaixi.li@bytedance.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

selftests/bpf: Fix tunnel remote IP comments

In namespace at_ns0, the IP address of tnl dev is 10.1.1.100 which is the
overlay IP, and the ip address of veth0 is 172.16.1.100 which is the vtep
IP. When doing 'ping 10.1.1.100' from root namespace, the remote_ip should
be 172.16.1.100.

Fixes: 933a741e3b82 ("selftests/bpf: bpf tunnel test.")
Signed-off-by: Kaixi Fan <fankaixi.li@bytedance.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20220313164116.5889-1-fankaixi.li@bytedance.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

seltests: bpf: test_tunnel: Use ip neigh

The 'arp' command is deprecated and is another dependency of the selftest.
Just use 'ip neigh', the test depends on iproute2 already.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/40f24b9d3f0f53b5c44471b452f9a11f4d13b7af.1632236133.git.jbenc@redhat.com

selftest/bpf: Add missed ip6ip6 test back

In comment 173ca26e9b51 ("samples/bpf: add comprehensive ipip, ipip6,
ip6ip6 test") we added ip6ip6 test for bpf tunnel testing. But in commit
933a741e3b82 ("selftests/bpf: bpf tunnel test.") when we moved it to
the current folder, we didn't add it.

This patch add the ip6ip6 test back to bpf tunnel test. Update the ipip6's
topology for both IPv4 and IPv6 testing. Since iperf test is removed as
currect framework simplified it in purpose, I also removed unused tcp
checkings in test_tunnel_kern.c.

Fixes: 933a741e3b82 ("selftests/bpf: bpf tunnel test.")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201110015013.1570716-2-liuhangbin@gmail.com

selftests/bpf: fail test_tunnel.sh if subtests fail

Right now test_tunnel.sh always exits with success even if some
of the subtests fail. Since the output is very verbose, it's
hard to spot the issues with subtests. Let's fail the script
if any subtest fails.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

bpf, selftests: delete xfrm tunnel when test exits.

Make the printting of bpf xfrm tunnel better and
cleanup xfrm state and policy when xfrm test finishes.

Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

bpf, selftest: check tunnel type more accurately

Grep tunnel type directly to make sure 'ip' command supports it.

Signed-off-by: Jian Wang <jianjian.wang1@gmail.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

selftests/bpf: bpf tunnel test.

The patch migrates the original tests at samples/bpf/tcbpf2_kern.c
and samples/bpf/test_tunnel_bpf.sh to selftests. There are a couple
changes from the original:
1) add ipv6 vxlan, ipv6 geneve, ipv6 ipip tests
2) simplify the original ipip tests (remove iperf tests)
3) improve documentation
4) use bpf_ntoh* and bpf_hton* api

In summary, 'test_tunnel_kern.o' contains the following bpf program:
GRE: gre_set_tunnel, gre_get_tunnel
IP6GRE: ip6gretap_set_tunnel, ip6gretap_get_tunnel
ERSPAN: erspan_set_tunnel, erspan_get_tunnel
IP6ERSPAN: ip4ip6erspan_set_tunnel, ip4ip6erspan_get_tunnel
VXLAN: vxlan_set_tunnel, vxlan_get_tunnel
IP6VXLAN: ip6vxlan_set_tunnel, ip6vxlan_get_tunnel
GENEVE: geneve_set_tunnel, geneve_get_tunnel
IP6GENEVE: ip6geneve_set_tunnel, ip6geneve_get_tunnel
IPIP: ipip_set_tunnel, ipip_get_tunnel
IP6IP: ipip6_set_tunnel, ipip6_get_tunnel,
ip6ip6_set_tunnel, ip6ip6_get_tunnel
XFRM: xfrm_get_state

Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>