归档：2022-11-17

Posted 2023-02-27 rtoax

 

================================================================================

```

selftests/bpf: Fix error: undeclared identifier 'NF_NAT_MANIP_SRC'

commit 472caa69183f("netfilter: nat: un-export nf_nat_used_tuple")

introduce NF_NAT_MANIP_SRC/DST enum in include/net/netfilter/nf_nat.h,

and commit b06b45e82b59("selftests/bpf: add tests for bpf_ct_set_nat_info

kfunc") use NF_NAT_MANIP_SRC/DST in test_bpf_nf.c.

In bpf kself-test config (tools/testing/selftests/bpf/config) nf_nat

is compiled as built-in, this issue occurs just if it is compiled as

module. We could use BPF CO-RE and ___suffix rule to avoid this.

How to reproduce the error:

$ make -C tools/testing/selftests/bpf/

...

CLNG-BPF [test_maps] test_bpf_nf.bpf.o

error: use of undeclared identifier 'NF_NAT_MANIP_SRC'

bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC);

^

error: use of undeclared identifier 'NF_NAT_MANIP_DST'

bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST);

^

2 errors generated.

```

V2: use BPF CO-RE and ___suffix rule to avoid this error.

https://lore.kernel.org/lkml/[e-mail]/

V1: https://lore.kernel.org/lkml/[e-mail]/

 

================================================================================

The motivation for this patch is to eliminate the compilation warning,

maybe one day we will compile the kernel with "-Werror -Wall", at which

point this compilation warning will turn into a compilation error, we

should fix this error in advance.

================================================================================

# TODO

https://lore.kernel.org/lkml/[e-mail]/

 

It does break CI ([0]). We could use BPF CO-RE and ___suffix rule to

avoid this. But we can also say that selftests/bpf/config,<arch> has

to be used by bots that want to build BPF selftests.

[0] https://github.com/kernel-patches/bpf/actions/runs/3446651033/jobs/5752592868

```

Subject: Re: [PATCH bpf-next] selftests/bpf: Fix error undeclared identifier 'NF_NAT_MANIP_SRC'

Thank you all for your replies, my config:

$ grep NETFILTER config

CONFIG_NETFILTER=y

...

CONFIG_NETFILTER_XT_MARK=m

CONFIG_NETFILTER_XT_NAT=m

...

CONFIG_NETFILTER_XT_MATCH_TCPMSS=m

Link: https://github.com/kernel-patches/bpf/actions/runs/3446651033/jobs/5752592868

```

 

================================================================================

https://lore.kernel.org/lkml/[e-mail]/

 

```

```

releases/gcc-10.1.0 OK

commit d14c547abd484d3540b692bb8048c4a6efe92c8b

Author: Martin Sebor <[e-mail]>

Date: Fri Aug 28 13:13:28 2020 -0600

Add -Wstringop-overread for reading past the end by string functions.

gcc-11.1.0

gcc/gcc/testsuite/gcc.dg/pragma-diag-10.c

 

================================================================================

enum nf_inet_hooks

NF_INET_PRE_ROUTING = 0,

NF_INET_LOCAL_IN = 1,

NF_INET_FORWARD = 2,

NF_INET_LOCAL_OUT = 3,

NF_INET_POST_ROUTING = 4,

NF_INET_NUMHOOKS = 5,

NF_INET_INGRESS = 5,

;

enum nf_nat_manip_type

NF_NAT_MANIP_SRC,

NF_NAT_MANIP_DST

;

 

================================================================================

```

docs/zh_CN: Update zh_CN/arm64/elf_hwcaps.rst

Add updates from the Documentation/arm64/elf_hwcaps.rst, and synchronize

the changes of commit 5d8505fd039c("arm64: Fix the documented event stream

frequency").

```

 

================================================================================

```

$ make -C tools/testing/selftests/bpf/

CLNG-BPF [test_maps] test_kfunc_dynptr_param.bpf.o

error: variable has incomplete type 'struct bpf_dynptr'

struct bpf_dynptr ptr;

^

bpf_helper_defs.h:42:8: note: forward declaration of 'struct bpf_dynptr'

struct bpf_dynptr;

^

error: variable has incomplete type 'struct bpf_dynptr'

struct bpf_dynptr ptr;

^

bpf_helper_defs.h:42:8: note: forward declaration of 'struct bpf_dynptr'

struct bpf_dynptr;

^

2 errors generated.

```

```

[rongtao@RT-PC linux]$ make -C tools/testing/selftests/bpf/

make: Entering directory '/home/sd/Git/linux/tools/testing/selftests/bpf'

CLNG-BPF [test_maps] test_kfunc_dynptr_param.bpf.o

progs/test_kfunc_dynptr_param.c:40:20: error: variable has incomplete type 'struct bpf_dynptr'

struct bpf_dynptr ptr;

^

/home/sd/Git/linux/tools/testing/selftests/bpf/tools/include/bpf/bpf_helper_defs.h:42:8: note: forward declaration of 'struct bpf_dynptr'

struct bpf_dynptr;

^

progs/test_kfunc_dynptr_param.c:69:20: error: variable has incomplete type 'struct bpf_dynptr'

struct bpf_dynptr ptr;

^

/home/sd/Git/linux/tools/testing/selftests/bpf/tools/include/bpf/bpf_helper_defs.h:42:8: note: forward declaration of 'struct bpf_dynptr'

struct bpf_dynptr;

^

2 errors generated.

```

enum nf_nat_manip_type