Re: [PATCH bpf-next] selftests/bpf: Fix undeclared identifier build errors of test_bpf_nf.c

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On 1/16/23 5:54 AM, Alan Maguire wrote:
On 16/01/2023 12:30, Eduard Zingerman wrote:
On Mon, 2023-01-16 at 12:55 +0800, Tiezhu Yang wrote:
$ make -C tools/testing/selftests/bpf/

   CLNG-BPF [test_maps] test_bpf_nf.bpf.o
progs/test_bpf_nf.c:160:42: error: use of undeclared identifier 'NF_NAT_MANIP_SRC'
                 bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC);
                                                        ^
progs/test_bpf_nf.c:163:42: error: use of undeclared identifier 'NF_NAT_MANIP_DST'
                 bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST);
                                                        ^
2 errors generated.

Copy the definitions in include/net/netfilter/nf_nat.h to test_bpf_nf.c
to fix the above build errors.

Fixes: b06b45e82b59 ("selftests/bpf: add tests for bpf_ct_set_nat_info kfunc")
Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
---
  tools/testing/selftests/bpf/progs/test_bpf_nf.c | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
index 227e85e..114f961 100644
--- a/tools/testing/selftests/bpf/progs/test_bpf_nf.c
+++ b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
@@ -34,6 +34,11 @@ __be16 dport = 0;
  int test_exist_lookup = -ENOENT;
  u32 test_exist_lookup_mark = 0;
+enum nf_nat_manip_type {
+	NF_NAT_MANIP_SRC,
+	NF_NAT_MANIP_DST
+};
+

This is confusing, when I build the kernel/tests I get the declaration
the "enum nf_nat_manip_type" from the vmlinux.h (which is included from test_bpf_nf.c).
Which means that this patch results in compilation error with my configuration.
Is there a chance that your kernel is configured without some necessary netfilter
configuration options? Have you tried this patch with BPF CI?


Yep; I suspect if CONFIG_NF_NAT=m , the required definitions won't make it
into vmlinux.h. The reference tools/testing/seftests/bpf/config has
CONFIG_NF_NAT=y so it is at least documented in the referenced config.

I'd suggest going the route of

commit aa67961f3243dfff26c47769f87b4d94b07ec71f
Author: Martin KaFai Lau <martin.lau@xxxxxxxxxx>
Date:   Tue Dec 6 11:35:54 2022 -0800

     selftests/bpf: Allow building bpf tests with CONFIG_XFRM_INTERFACE=[m|n]
...and adding/using local definitons like:

enum nf_nat_manip_type_local {
	NF_NAT_MANIP_SRC_LOCAL,
	NF_NAT_MANIP_DST_LOCAL
};

The above won't support core, and since preserve_access_index attribute
does not support enum for now. We need to use bpf_core_enum_value to
retrieve the proper value through CORE.

could you try the following?

enum nf_nat_manip_type___local {
	NF_NAT_MANIP_SRC___LOCAL,
	NF_NAT_MANIP_DST___LOCAL,
};

...
bpf_ct_set_nat_info(ct, &saddr, sport, bpf_core_enum_value(enum nf_nat_manip_type___local, NF_NAT_MANIP_SRC___LOCAL));
...

bpf_ct_set_nat_info(ct, &daddr, dport, bpf_core_enum_value(enum nf_nat_manip_type___local, NF_NAT_MANIP_DST___LOCAL));

whether it works or not? Could you also try if the
enumerator sequence in enum nf_nat_manip_type___local changed?


...to avoid the name clash.


Alan



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