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3 Commits

Author SHA1 Message Date
Paul Chaignon
1115169f47 selftests/bpf: Don't assign outer source IP to host 
The previous commit fixed a bug in the bpf_skb_set_tunnel_key helper to
avoid dropping packets whose outer source IP address isn't assigned to a
host interface. This commit changes the corresponding selftest to not
assign the outer source IP address to an interface.

Not assigning the source IP to an interface causes two issues in the
existing test:

1. The ARP requests will fail for that IP address so we need to add the
   ARP entry manually.
2. The encapsulated ICMP echo reply traffic will not reach the VXLAN
   device. It will be dropped by the stack before, because the
   outer destination IP is unknown.

To solve 2., we have two choices. Either we perform decapsulation
ourselves in a BPF program attached at veth1 (the base device for the
VXLAN device), or we switch the outer destination address when we
receive the packet at veth1, such that the stack properly demultiplexes
it to the VXLAN device afterward.

This commit implements the second approach, where we switch the outer
destination address from the unassigned IP address to the assigned one,
only for VXLAN traffic ingressing veth1.

Then, at the vxlan device, the BPF program that checks the output of
bpf_skb_get_tunnel_key needs to be updated as the expected local IP
address is now the unassigned one.

Signed-off-by: Paul Chaignon <paul@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/4addde76eaf3477a58975bef15ed2788c44e5f55.1658759380.git.paul@isovalent.com
 2022-07-26 12:43:48 +02:00
Yonghong Song
fd0ad6f1d1 selftests/bpf: fix a few clang compilation errors 
With latest clang, I got the following compilation errors:
  .../prog_tests/test_tunnel.c:291:6: error: variable 'local_ip_map_fd' is used uninitialized
     whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
       if (attach_tc_prog(&tc_hook, -1, set_dst_prog_fd))
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  .../bpf/prog_tests/test_tunnel.c:312:6: note: uninitialized use occurs here
        if (local_ip_map_fd >= 0)
            ^~~~~~~~~~~~~~~
  ...
  .../prog_tests/kprobe_multi_test.c:346:6: error: variable 'err' is used uninitialized
      whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
        if (IS_ERR(map))
            ^~~~~~~~~~~
  .../prog_tests/kprobe_multi_test.c:388:6: note: uninitialized use occurs here
        if (err) {
            ^~~

This patch fixed the above compilation errors.

Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20220511184735.3670214-1-yhs@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
 2022-05-11 12:58:12 -07:00
Kaixi Fan
1ee7efd40a 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>
 2022-05-10 10:49:03 -07:00