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[bpf-next,v2] selftests/bpf: Fix build errors if CONFIG_NF_CONNTRACK=m

Message ID 1674028604-7113-1-git-send-email-yangtiezhu@loongson.cn (mailing list archive)
State Accepted
Commit 92afc5329a5b23d876b215b783d200352d5aaea6
Delegated to: BPF
Headers show
Series [bpf-next,v2] selftests/bpf: Fix build errors if CONFIG_NF_CONNTRACK=m | expand

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Commit Message

Tiezhu Yang Jan. 18, 2023, 7:56 a.m. UTC 
If CONFIG_NF_CONNTRACK=m, there are no definitions of NF_NAT_MANIP_SRC
and NF_NAT_MANIP_DST in vmlinux.h, build test_bpf_nf.c failed.

$ 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,
in order to avoid redefinitions if CONFIG_NF_CONNTRACK=y, rename them with
___local suffix. This is similar with commit 1058b6a78db2 ("selftests/bpf:
Do not fail build if CONFIG_NF_CONNTRACK=m/n").

Fixes: b06b45e82b59 ("selftests/bpf: add tests for bpf_ct_set_nat_info kfunc")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 tools/testing/selftests/bpf/progs/test_bpf_nf.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

Comments

Jiri Olsa Jan. 18, 2023, 8:10 a.m. UTC | #1 
On Wed, Jan 18, 2023 at 03:56:44PM +0800, Tiezhu Yang wrote:
> If CONFIG_NF_CONNTRACK=m, there are no definitions of NF_NAT_MANIP_SRC
> and NF_NAT_MANIP_DST in vmlinux.h, build test_bpf_nf.c failed.
> 
> $ 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,
> in order to avoid redefinitions if CONFIG_NF_CONNTRACK=y, rename them with
> ___local suffix. This is similar with commit 1058b6a78db2 ("selftests/bpf:
> Do not fail build if CONFIG_NF_CONNTRACK=m/n").
> 
> Fixes: b06b45e82b59 ("selftests/bpf: add tests for bpf_ct_set_nat_info kfunc")
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

I hit the same problem, thanks

Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Jiri Olsa <jolsa@kernel.org>

jirka

> ---
>  tools/testing/selftests/bpf/progs/test_bpf_nf.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
> index 227e85e..9fc603c 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___local {
> +	NF_NAT_MANIP_SRC___local,
> +	NF_NAT_MANIP_DST___local
> +};
> +
>  struct nf_conn;
>  
>  struct bpf_ct_opts___local {
> @@ -58,7 +63,7 @@ int bpf_ct_change_timeout(struct nf_conn *, u32) __ksym;
>  int bpf_ct_set_status(struct nf_conn *, u32) __ksym;
>  int bpf_ct_change_status(struct nf_conn *, u32) __ksym;
>  int bpf_ct_set_nat_info(struct nf_conn *, union nf_inet_addr *,
> -			int port, enum nf_nat_manip_type) __ksym;
> +			int port, enum nf_nat_manip_type___local) __ksym;
>  
>  static __always_inline void
>  nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
> @@ -157,10 +162,10 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
>  
>  		/* snat */
>  		saddr.ip = bpf_get_prandom_u32();
> -		bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC);
> +		bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC___local);
>  		/* dnat */
>  		daddr.ip = bpf_get_prandom_u32();
> -		bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST);
> +		bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST___local);
>  
>  		ct_ins = bpf_ct_insert_entry(ct);
>  		if (ct_ins) {
> -- 
> 2.1.0
>
Yonghong Song Jan. 18, 2023, 7:42 p.m. UTC | #2 
On 1/17/23 11:56 PM, Tiezhu Yang wrote:
> If CONFIG_NF_CONNTRACK=m, there are no definitions of NF_NAT_MANIP_SRC
> and NF_NAT_MANIP_DST in vmlinux.h, build test_bpf_nf.c failed.
> 
> $ 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,
> in order to avoid redefinitions if CONFIG_NF_CONNTRACK=y, rename them with
> ___local suffix. This is similar with commit 1058b6a78db2 ("selftests/bpf:
> Do not fail build if CONFIG_NF_CONNTRACK=m/n").
> 
> Fixes: b06b45e82b59 ("selftests/bpf: add tests for bpf_ct_set_nat_info kfunc")
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

Okay, LGTM. We will address enum CORE support with preserve_access_index 
attribute later.

Acked-by: Yonghong Song <yhs@fb.com>
patchwork-bot+netdevbpf@kernel.org Jan. 18, 2023, 9:50 p.m. UTC | #3 
Hello:

This patch was applied to bpf/bpf-next.git (master)
by Martin KaFai Lau <martin.lau@kernel.org>:

On Wed, 18 Jan 2023 15:56:44 +0800 you wrote:
> If CONFIG_NF_CONNTRACK=m, there are no definitions of NF_NAT_MANIP_SRC
> and NF_NAT_MANIP_DST in vmlinux.h, build test_bpf_nf.c failed.
> 
> $ 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.
> 
> [...]

Here is the summary with links:
  - [bpf-next,v2] selftests/bpf: Fix build errors if CONFIG_NF_CONNTRACK=m
    https://git.kernel.org/bpf/bpf-next/c/92afc5329a5b

You are awesome, thank you!
Andrii Nakryiko Jan. 23, 2023, 11:17 p.m. UTC | #4 
On Tue, Jan 17, 2023 at 11:57 PM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
>
> If CONFIG_NF_CONNTRACK=m, there are no definitions of NF_NAT_MANIP_SRC
> and NF_NAT_MANIP_DST in vmlinux.h, build test_bpf_nf.c failed.
>
> $ 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,
> in order to avoid redefinitions if CONFIG_NF_CONNTRACK=y, rename them with
> ___local suffix. This is similar with commit 1058b6a78db2 ("selftests/bpf:
> Do not fail build if CONFIG_NF_CONNTRACK=m/n").
>
> Fixes: b06b45e82b59 ("selftests/bpf: add tests for bpf_ct_set_nat_info kfunc")
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---
>  tools/testing/selftests/bpf/progs/test_bpf_nf.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
> index 227e85e..9fc603c 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___local {
> +       NF_NAT_MANIP_SRC___local,
> +       NF_NAT_MANIP_DST___local
> +};
> +
>  struct nf_conn;
>
>  struct bpf_ct_opts___local {
> @@ -58,7 +63,7 @@ int bpf_ct_change_timeout(struct nf_conn *, u32) __ksym;
>  int bpf_ct_set_status(struct nf_conn *, u32) __ksym;
>  int bpf_ct_change_status(struct nf_conn *, u32) __ksym;
>  int bpf_ct_set_nat_info(struct nf_conn *, union nf_inet_addr *,
> -                       int port, enum nf_nat_manip_type) __ksym;
> +                       int port, enum nf_nat_manip_type___local) __ksym;
>
>  static __always_inline void
>  nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
> @@ -157,10 +162,10 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
>
>                 /* snat */
>                 saddr.ip = bpf_get_prandom_u32();
> -               bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC);
> +               bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC___local);
>                 /* dnat */
>                 daddr.ip = bpf_get_prandom_u32();
> -               bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST);
> +               bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST___local);
>

it would be a bit more reliable if you used `bpf_core_enum_value(enum
nf_nat_manip_type___local, NF_NAT_MANIP_DST___local)`. That would make
libbpf substitute correct absolute value, if actual enum
nf_nat_manip_type in kernel ever changed. Please consider a follow up
patch for this.

>                 ct_ins = bpf_ct_insert_entry(ct);
>                 if (ct_ins) {
> --
> 2.1.0
>
Tiezhu Yang Jan. 29, 2023, 6:25 a.m. UTC | #5 
On 01/24/2023 07:17 AM, Andrii Nakryiko wrote:
> On Tue, Jan 17, 2023 at 11:57 PM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
>>
>> If CONFIG_NF_CONNTRACK=m, there are no definitions of NF_NAT_MANIP_SRC
>> and NF_NAT_MANIP_DST in vmlinux.h, build test_bpf_nf.c failed.
>>
>> $ 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,
>> in order to avoid redefinitions if CONFIG_NF_CONNTRACK=y, rename them with
>> ___local suffix. This is similar with commit 1058b6a78db2 ("selftests/bpf:
>> Do not fail build if CONFIG_NF_CONNTRACK=m/n").
>>
>> Fixes: b06b45e82b59 ("selftests/bpf: add tests for bpf_ct_set_nat_info kfunc")
>> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
>> ---
>>  tools/testing/selftests/bpf/progs/test_bpf_nf.c | 11 ++++++++---
>>  1 file changed, 8 insertions(+), 3 deletions(-)
>>
>> diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
>> index 227e85e..9fc603c 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___local {
>> +       NF_NAT_MANIP_SRC___local,
>> +       NF_NAT_MANIP_DST___local
>> +};
>> +
>>  struct nf_conn;
>>
>>  struct bpf_ct_opts___local {
>> @@ -58,7 +63,7 @@ int bpf_ct_change_timeout(struct nf_conn *, u32) __ksym;
>>  int bpf_ct_set_status(struct nf_conn *, u32) __ksym;
>>  int bpf_ct_change_status(struct nf_conn *, u32) __ksym;
>>  int bpf_ct_set_nat_info(struct nf_conn *, union nf_inet_addr *,
>> -                       int port, enum nf_nat_manip_type) __ksym;
>> +                       int port, enum nf_nat_manip_type___local) __ksym;
>>
>>  static __always_inline void
>>  nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
>> @@ -157,10 +162,10 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
>>
>>                 /* snat */
>>                 saddr.ip = bpf_get_prandom_u32();
>> -               bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC);
>> +               bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC___local);
>>                 /* dnat */
>>                 daddr.ip = bpf_get_prandom_u32();
>> -               bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST);
>> +               bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST___local);
>>
>
> it would be a bit more reliable if you used `bpf_core_enum_value(enum
> nf_nat_manip_type___local, NF_NAT_MANIP_DST___local)`. That would make
> libbpf substitute correct absolute value, if actual enum
> nf_nat_manip_type in kernel ever changed. Please consider a follow up
> patch for this.

Sorry for the late reply, I tested the code as your suggestion, but it 
failed.

failed to resolve CO-RE relocation <enumval_value> [101] enum 
nf_nat_manip_type___local::NF_NAT_MANIP_SRC___local = 0

Is it necessary to send a follow patch now? Thank you.

Here are the test results.

(1) bpf_nf passed with the current code if CONFIG_NF_CONNTRACK=m:

[root@fedora bpf]# ./test_progs -a bpf_nf
#16/1    bpf_nf/xdp-ct:OK
#16/2    bpf_nf/tc-bpf-ct:OK
#16/3    bpf_nf/alloc_release:OK
#16/4    bpf_nf/insert_insert:OK
#16/5    bpf_nf/lookup_insert:OK
#16/6    bpf_nf/set_timeout_after_insert:OK
#16/7    bpf_nf/set_status_after_insert:OK
#16/8    bpf_nf/change_timeout_after_alloc:OK
#16/9    bpf_nf/change_status_after_alloc:OK
#16/10   bpf_nf/write_not_allowlisted_field:OK
#16      bpf_nf:OK
Summary: 1/10 PASSED, 0 SKIPPED, 0 FAILED

(2) bpf_nf failed with the following changes if CONFIG_NF_CONNTRACK=m:

[yangtiezhu@fedora bpf.git]$ git diff
diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c 
b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
index 9fc603c9d673..f56ba60ab809 100644
--- a/tools/testing/selftests/bpf/progs/test_bpf_nf.c
+++ b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
@@ -2,6 +2,7 @@
  #include <vmlinux.h>
  #include <bpf/bpf_helpers.h>
  #include <bpf/bpf_endian.h>
+#include <bpf/bpf_core_read.h>

  #define EAFNOSUPPORT 97
  #define EPROTO 71
@@ -162,10 +163,14 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *, 
struct bpf_sock_tuple *, u32,

                 /* snat */
                 saddr.ip = bpf_get_prandom_u32();
-               bpf_ct_set_nat_info(ct, &saddr, sport, 
NF_NAT_MANIP_SRC___local);
+               bpf_ct_set_nat_info(ct, &saddr, sport,
+                                   bpf_core_enum_value(enum 
nf_nat_manip_type___local,
+ 
NF_NAT_MANIP_SRC___local));
                 /* dnat */
                 daddr.ip = bpf_get_prandom_u32();
-               bpf_ct_set_nat_info(ct, &daddr, dport, 
NF_NAT_MANIP_DST___local);
+               bpf_ct_set_nat_info(ct, &daddr, dport,
+                                   bpf_core_enum_value(enum 
nf_nat_manip_type___local,
+ 
NF_NAT_MANIP_DST___local));

                 ct_ins = bpf_ct_insert_entry(ct);
                 if (ct_ins) {

[root@fedora bpf]# ./test_progs -a bpf_nf
...
All error logs:
libbpf: prog 'nf_xdp_ct_test': BPF program load failed: Invalid argument
libbpf: prog 'nf_xdp_ct_test': -- BEGIN PROG LOAD LOG --
...
libbpf: failed to load object 'test_bpf_nf'
libbpf: failed to load BPF skeleton 'test_bpf_nf': -22
test_bpf_nf_ct:FAIL:test_bpf_nf__open_and_load unexpected error: -22
#16/1    bpf_nf/xdp-ct:FAIL
libbpf: prog 'nf_xdp_ct_test': BPF program load failed: Invalid argument
libbpf: prog 'nf_xdp_ct_test': -- BEGIN PROG LOAD LOG --
...
217: (bf) r1 = r7                     ; 
R1_w=ptr_nf_conn___init(ref_obj_id=18,off=0,imm=0) 
R7=ptr_nf_conn___init(ref_obj_id=18,off=0,imm=0) refs=18
218: <invalid CO-RE relocation>
failed to resolve CO-RE relocation <enumval_value> [101] enum 
nf_nat_manip_type___local::NF_NAT_MANIP_SRC___local = 0
processed 170 insns (limit 1000000) max_states_per_insn 0 total_states 
12 peak_states 12 mark_read 2
-- END PROG LOAD LOG --
libbpf: prog 'nf_xdp_ct_test': failed to load: -22
libbpf: failed to load object 'test_bpf_nf'
libbpf: failed to load BPF skeleton 'test_bpf_nf': -22
test_bpf_nf_ct:FAIL:test_bpf_nf__open_and_load unexpected error: -22
#16/2    bpf_nf/tc-bpf-ct:FAIL
#16      bpf_nf:FAIL
Summary: 0/8 PASSED, 0 SKIPPED, 1 FAILED

Thanks,
Tiezhu
Andrii Nakryiko Feb. 3, 2023, 10:16 p.m. UTC | #6 
On Sat, Jan 28, 2023 at 10:25 PM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
>
>
>
> On 01/24/2023 07:17 AM, Andrii Nakryiko wrote:
> > On Tue, Jan 17, 2023 at 11:57 PM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
> >>
> >> If CONFIG_NF_CONNTRACK=m, there are no definitions of NF_NAT_MANIP_SRC
> >> and NF_NAT_MANIP_DST in vmlinux.h, build test_bpf_nf.c failed.
> >>
> >> $ 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,
> >> in order to avoid redefinitions if CONFIG_NF_CONNTRACK=y, rename them with
> >> ___local suffix. This is similar with commit 1058b6a78db2 ("selftests/bpf:
> >> Do not fail build if CONFIG_NF_CONNTRACK=m/n").
> >>
> >> Fixes: b06b45e82b59 ("selftests/bpf: add tests for bpf_ct_set_nat_info kfunc")
> >> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> >> ---
> >>  tools/testing/selftests/bpf/progs/test_bpf_nf.c | 11 ++++++++---
> >>  1 file changed, 8 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
> >> index 227e85e..9fc603c 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___local {
> >> +       NF_NAT_MANIP_SRC___local,
> >> +       NF_NAT_MANIP_DST___local
> >> +};
> >> +
> >>  struct nf_conn;
> >>
> >>  struct bpf_ct_opts___local {
> >> @@ -58,7 +63,7 @@ int bpf_ct_change_timeout(struct nf_conn *, u32) __ksym;
> >>  int bpf_ct_set_status(struct nf_conn *, u32) __ksym;
> >>  int bpf_ct_change_status(struct nf_conn *, u32) __ksym;
> >>  int bpf_ct_set_nat_info(struct nf_conn *, union nf_inet_addr *,
> >> -                       int port, enum nf_nat_manip_type) __ksym;
> >> +                       int port, enum nf_nat_manip_type___local) __ksym;
> >>
> >>  static __always_inline void
> >>  nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
> >> @@ -157,10 +162,10 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
> >>
> >>                 /* snat */
> >>                 saddr.ip = bpf_get_prandom_u32();
> >> -               bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC);
> >> +               bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC___local);
> >>                 /* dnat */
> >>                 daddr.ip = bpf_get_prandom_u32();
> >> -               bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST);
> >> +               bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST___local);
> >>
> >
> > it would be a bit more reliable if you used `bpf_core_enum_value(enum
> > nf_nat_manip_type___local, NF_NAT_MANIP_DST___local)`. That would make
> > libbpf substitute correct absolute value, if actual enum
> > nf_nat_manip_type in kernel ever changed. Please consider a follow up
> > patch for this.
>
> Sorry for the late reply, I tested the code as your suggestion, but it
> failed.
>
> failed to resolve CO-RE relocation <enumval_value> [101] enum
> nf_nat_manip_type___local::NF_NAT_MANIP_SRC___local = 0


Was nf_conntrack kernel module loaded at the time when you ran the
test? If yes, what's the output of

bpftool btf dump file /sys/kernel/btf/nf_conntrack | grep nf_nat_manip_type

?

>
> Is it necessary to send a follow patch now? Thank you.
>
> Here are the test results.
>
> (1) bpf_nf passed with the current code if CONFIG_NF_CONNTRACK=m:
>
> [root@fedora bpf]# ./test_progs -a bpf_nf
> #16/1    bpf_nf/xdp-ct:OK
> #16/2    bpf_nf/tc-bpf-ct:OK
> #16/3    bpf_nf/alloc_release:OK
> #16/4    bpf_nf/insert_insert:OK
> #16/5    bpf_nf/lookup_insert:OK
> #16/6    bpf_nf/set_timeout_after_insert:OK
> #16/7    bpf_nf/set_status_after_insert:OK
> #16/8    bpf_nf/change_timeout_after_alloc:OK
> #16/9    bpf_nf/change_status_after_alloc:OK
> #16/10   bpf_nf/write_not_allowlisted_field:OK
> #16      bpf_nf:OK
> Summary: 1/10 PASSED, 0 SKIPPED, 0 FAILED
>
> (2) bpf_nf failed with the following changes if CONFIG_NF_CONNTRACK=m:
>
> [yangtiezhu@fedora bpf.git]$ git diff
> diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c
> b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
> index 9fc603c9d673..f56ba60ab809 100644
> --- a/tools/testing/selftests/bpf/progs/test_bpf_nf.c
> +++ b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
> @@ -2,6 +2,7 @@
>   #include <vmlinux.h>
>   #include <bpf/bpf_helpers.h>
>   #include <bpf/bpf_endian.h>
> +#include <bpf/bpf_core_read.h>
>
>   #define EAFNOSUPPORT 97
>   #define EPROTO 71
> @@ -162,10 +163,14 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *,
> struct bpf_sock_tuple *, u32,
>
>                  /* snat */
>                  saddr.ip = bpf_get_prandom_u32();
> -               bpf_ct_set_nat_info(ct, &saddr, sport,
> NF_NAT_MANIP_SRC___local);
> +               bpf_ct_set_nat_info(ct, &saddr, sport,
> +                                   bpf_core_enum_value(enum
> nf_nat_manip_type___local,
> +
> NF_NAT_MANIP_SRC___local));
>                  /* dnat */
>                  daddr.ip = bpf_get_prandom_u32();
> -               bpf_ct_set_nat_info(ct, &daddr, dport,
> NF_NAT_MANIP_DST___local);
> +               bpf_ct_set_nat_info(ct, &daddr, dport,
> +                                   bpf_core_enum_value(enum
> nf_nat_manip_type___local,
> +
> NF_NAT_MANIP_DST___local));
>
>                  ct_ins = bpf_ct_insert_entry(ct);
>                  if (ct_ins) {
>
> [root@fedora bpf]# ./test_progs -a bpf_nf
> ...
> All error logs:
> libbpf: prog 'nf_xdp_ct_test': BPF program load failed: Invalid argument
> libbpf: prog 'nf_xdp_ct_test': -- BEGIN PROG LOAD LOG --
> ...
> libbpf: failed to load object 'test_bpf_nf'
> libbpf: failed to load BPF skeleton 'test_bpf_nf': -22
> test_bpf_nf_ct:FAIL:test_bpf_nf__open_and_load unexpected error: -22
> #16/1    bpf_nf/xdp-ct:FAIL
> libbpf: prog 'nf_xdp_ct_test': BPF program load failed: Invalid argument
> libbpf: prog 'nf_xdp_ct_test': -- BEGIN PROG LOAD LOG --
> ...
> 217: (bf) r1 = r7                     ;
> R1_w=ptr_nf_conn___init(ref_obj_id=18,off=0,imm=0)
> R7=ptr_nf_conn___init(ref_obj_id=18,off=0,imm=0) refs=18
> 218: <invalid CO-RE relocation>
> failed to resolve CO-RE relocation <enumval_value> [101] enum
> nf_nat_manip_type___local::NF_NAT_MANIP_SRC___local = 0
> processed 170 insns (limit 1000000) max_states_per_insn 0 total_states
> 12 peak_states 12 mark_read 2
> -- END PROG LOAD LOG --
> libbpf: prog 'nf_xdp_ct_test': failed to load: -22
> libbpf: failed to load object 'test_bpf_nf'
> libbpf: failed to load BPF skeleton 'test_bpf_nf': -22
> test_bpf_nf_ct:FAIL:test_bpf_nf__open_and_load unexpected error: -22
> #16/2    bpf_nf/tc-bpf-ct:FAIL
> #16      bpf_nf:FAIL
> Summary: 0/8 PASSED, 0 SKIPPED, 1 FAILED
>
> Thanks,
> Tiezhu
>
Tiezhu Yang Feb. 6, 2023, 12:55 p.m. UTC | #7 
On 02/04/2023 06:16 AM, Andrii Nakryiko wrote:
> On Sat, Jan 28, 2023 at 10:25 PM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
>>
>>
>>
>> On 01/24/2023 07:17 AM, Andrii Nakryiko wrote:
>>> On Tue, Jan 17, 2023 at 11:57 PM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
>>>>
>>>> If CONFIG_NF_CONNTRACK=m, there are no definitions of NF_NAT_MANIP_SRC
>>>> and NF_NAT_MANIP_DST in vmlinux.h, build test_bpf_nf.c failed.
>>>>
>>>> $ 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,
>>>> in order to avoid redefinitions if CONFIG_NF_CONNTRACK=y, rename them with
>>>> ___local suffix. This is similar with commit 1058b6a78db2 ("selftests/bpf:
>>>> Do not fail build if CONFIG_NF_CONNTRACK=m/n").
>>>>
>>>> Fixes: b06b45e82b59 ("selftests/bpf: add tests for bpf_ct_set_nat_info kfunc")
>>>> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
>>>> ---
>>>>  tools/testing/selftests/bpf/progs/test_bpf_nf.c | 11 ++++++++---
>>>>  1 file changed, 8 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
>>>> index 227e85e..9fc603c 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___local {
>>>> +       NF_NAT_MANIP_SRC___local,
>>>> +       NF_NAT_MANIP_DST___local
>>>> +};
>>>> +
>>>>  struct nf_conn;
>>>>
>>>>  struct bpf_ct_opts___local {
>>>> @@ -58,7 +63,7 @@ int bpf_ct_change_timeout(struct nf_conn *, u32) __ksym;
>>>>  int bpf_ct_set_status(struct nf_conn *, u32) __ksym;
>>>>  int bpf_ct_change_status(struct nf_conn *, u32) __ksym;
>>>>  int bpf_ct_set_nat_info(struct nf_conn *, union nf_inet_addr *,
>>>> -                       int port, enum nf_nat_manip_type) __ksym;
>>>> +                       int port, enum nf_nat_manip_type___local) __ksym;
>>>>
>>>>  static __always_inline void
>>>>  nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
>>>> @@ -157,10 +162,10 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
>>>>
>>>>                 /* snat */
>>>>                 saddr.ip = bpf_get_prandom_u32();
>>>> -               bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC);
>>>> +               bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC___local);
>>>>                 /* dnat */
>>>>                 daddr.ip = bpf_get_prandom_u32();
>>>> -               bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST);
>>>> +               bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST___local);
>>>>
>>>
>>> it would be a bit more reliable if you used `bpf_core_enum_value(enum
>>> nf_nat_manip_type___local, NF_NAT_MANIP_DST___local)`. That would make
>>> libbpf substitute correct absolute value, if actual enum
>>> nf_nat_manip_type in kernel ever changed. Please consider a follow up
>>> patch for this.
>>
>> Sorry for the late reply, I tested the code as your suggestion, but it
>> failed.
>>
>> failed to resolve CO-RE relocation <enumval_value> [101] enum
>> nf_nat_manip_type___local::NF_NAT_MANIP_SRC___local = 0
>
>
> Was nf_conntrack kernel module loaded at the time when you ran the
> test? If yes, what's the output of

Yes, nf_conntrack was loaded when ran the test.

[root@fedora bpf]# lsmod | grep -w nf_conntrack
nf_conntrack          188416  4 
nf_nat,nft_ct,nf_conntrack_netbios_ns,nf_conntrack_broadcast
nf_defrag_ipv6         24576  1 nf_conntrack
nf_defrag_ipv4         16384  1 nf_conntrack

[root@fedora bpf]# ./test_progs -a bpf_nf
...
218: <invalid CO-RE relocation>
failed to resolve CO-RE relocation <enumval_value> [101] enum 
nf_nat_manip_type___local::NF_NAT_MANIP_SRC___local = 0
processed 170 insns (limit 1000000) max_states_per_insn 0 total_states 
12 peak_states 12 mark_read 2
-- END PROG LOAD LOG --
libbpf: prog 'nf_xdp_ct_test': failed to load: -22
libbpf: failed to load object 'test_bpf_nf'
libbpf: failed to load BPF skeleton 'test_bpf_nf': -22
test_bpf_nf_ct:FAIL:test_bpf_nf__open_and_load unexpected error: -22
#16/2    bpf_nf/tc-bpf-ct:FAIL
#16      bpf_nf:FAIL
Summary: 0/8 PASSED, 0 SKIPPED, 1 FAILED

>
> bpftool btf dump file /sys/kernel/btf/nf_conntrack | grep nf_nat_manip_type
>
> ?
>

[root@fedora bpf]# ./bpftool btf dump file /sys/kernel/btf/nf_conntrack 
| grep nf_nat_manip_type
[130070] ENUM 'nf_nat_manip_type' encoding=UNSIGNED size=4 vlen=2
[root@fedora bpf]# ./bpftool btf dump file /sys/kernel/btf/nf_conntrack 
| grep NF_NAT_MANIP_SRC
	'NF_NAT_MANIP_SRC' val=0
[root@fedora bpf]# ./bpftool btf dump file /sys/kernel/btf/nf_conntrack 
| grep NF_NAT_MANIP_DST
	'NF_NAT_MANIP_DST' val=1


Thanks,
Tiezhu

>>
>> Is it necessary to send a follow patch now? Thank you.
>>
>> Here are the test results.
>>
>> (1) bpf_nf passed with the current code if CONFIG_NF_CONNTRACK=m:
>>
>> [root@fedora bpf]# ./test_progs -a bpf_nf
>> #16/1    bpf_nf/xdp-ct:OK
>> #16/2    bpf_nf/tc-bpf-ct:OK
>> #16/3    bpf_nf/alloc_release:OK
>> #16/4    bpf_nf/insert_insert:OK
>> #16/5    bpf_nf/lookup_insert:OK
>> #16/6    bpf_nf/set_timeout_after_insert:OK
>> #16/7    bpf_nf/set_status_after_insert:OK
>> #16/8    bpf_nf/change_timeout_after_alloc:OK
>> #16/9    bpf_nf/change_status_after_alloc:OK
>> #16/10   bpf_nf/write_not_allowlisted_field:OK
>> #16      bpf_nf:OK
>> Summary: 1/10 PASSED, 0 SKIPPED, 0 FAILED
>>
>> (2) bpf_nf failed with the following changes if CONFIG_NF_CONNTRACK=m:
>>
>> [yangtiezhu@fedora bpf.git]$ git diff
>> diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c
>> b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
>> index 9fc603c9d673..f56ba60ab809 100644
>> --- a/tools/testing/selftests/bpf/progs/test_bpf_nf.c
>> +++ b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
>> @@ -2,6 +2,7 @@
>>   #include <vmlinux.h>
>>   #include <bpf/bpf_helpers.h>
>>   #include <bpf/bpf_endian.h>
>> +#include <bpf/bpf_core_read.h>
>>
>>   #define EAFNOSUPPORT 97
>>   #define EPROTO 71
>> @@ -162,10 +163,14 @@ nf_ct_test(struct nf_conn *(*lookup_fn)(void *,
>> struct bpf_sock_tuple *, u32,
>>
>>                  /* snat */
>>                  saddr.ip = bpf_get_prandom_u32();
>> -               bpf_ct_set_nat_info(ct, &saddr, sport,
>> NF_NAT_MANIP_SRC___local);
>> +               bpf_ct_set_nat_info(ct, &saddr, sport,
>> +                                   bpf_core_enum_value(enum
>> nf_nat_manip_type___local,
>> +
>> NF_NAT_MANIP_SRC___local));
>>                  /* dnat */
>>                  daddr.ip = bpf_get_prandom_u32();
>> -               bpf_ct_set_nat_info(ct, &daddr, dport,
>> NF_NAT_MANIP_DST___local);
>> +               bpf_ct_set_nat_info(ct, &daddr, dport,
>> +                                   bpf_core_enum_value(enum
>> nf_nat_manip_type___local,
>> +
>> NF_NAT_MANIP_DST___local));
>>
>>                  ct_ins = bpf_ct_insert_entry(ct);
>>                  if (ct_ins) {
>>
>> [root@fedora bpf]# ./test_progs -a bpf_nf
>> ...
>> All error logs:
>> libbpf: prog 'nf_xdp_ct_test': BPF program load failed: Invalid argument
>> libbpf: prog 'nf_xdp_ct_test': -- BEGIN PROG LOAD LOG --
>> ...
>> libbpf: failed to load object 'test_bpf_nf'
>> libbpf: failed to load BPF skeleton 'test_bpf_nf': -22
>> test_bpf_nf_ct:FAIL:test_bpf_nf__open_and_load unexpected error: -22
>> #16/1    bpf_nf/xdp-ct:FAIL
>> libbpf: prog 'nf_xdp_ct_test': BPF program load failed: Invalid argument
>> libbpf: prog 'nf_xdp_ct_test': -- BEGIN PROG LOAD LOG --
>> ...
>> 217: (bf) r1 = r7                     ;
>> R1_w=ptr_nf_conn___init(ref_obj_id=18,off=0,imm=0)
>> R7=ptr_nf_conn___init(ref_obj_id=18,off=0,imm=0) refs=18
>> 218: <invalid CO-RE relocation>
>> failed to resolve CO-RE relocation <enumval_value> [101] enum
>> nf_nat_manip_type___local::NF_NAT_MANIP_SRC___local = 0
>> processed 170 insns (limit 1000000) max_states_per_insn 0 total_states
>> 12 peak_states 12 mark_read 2
>> -- END PROG LOAD LOG --
>> libbpf: prog 'nf_xdp_ct_test': failed to load: -22
>> libbpf: failed to load object 'test_bpf_nf'
>> libbpf: failed to load BPF skeleton 'test_bpf_nf': -22
>> test_bpf_nf_ct:FAIL:test_bpf_nf__open_and_load unexpected error: -22
>> #16/2    bpf_nf/tc-bpf-ct:FAIL
>> #16      bpf_nf:FAIL
>> Summary: 0/8 PASSED, 0 SKIPPED, 1 FAILED
>>
>> Thanks,
>> Tiezhu
>>
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/test_bpf_nf.c b/tools/testing/selftests/bpf/progs/test_bpf_nf.c
index 227e85e..9fc603c 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___local {
+	NF_NAT_MANIP_SRC___local,
+	NF_NAT_MANIP_DST___local
+};
+
 struct nf_conn;
 
 struct bpf_ct_opts___local {
@@ -58,7 +63,7 @@  int bpf_ct_change_timeout(struct nf_conn *, u32) __ksym;
 int bpf_ct_set_status(struct nf_conn *, u32) __ksym;
 int bpf_ct_change_status(struct nf_conn *, u32) __ksym;
 int bpf_ct_set_nat_info(struct nf_conn *, union nf_inet_addr *,
-			int port, enum nf_nat_manip_type) __ksym;
+			int port, enum nf_nat_manip_type___local) __ksym;
 
 static __always_inline void
 nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
@@ -157,10 +162,10 @@  nf_ct_test(struct nf_conn *(*lookup_fn)(void *, struct bpf_sock_tuple *, u32,
 
 		/* snat */
 		saddr.ip = bpf_get_prandom_u32();
-		bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC);
+		bpf_ct_set_nat_info(ct, &saddr, sport, NF_NAT_MANIP_SRC___local);
 		/* dnat */
 		daddr.ip = bpf_get_prandom_u32();
-		bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST);
+		bpf_ct_set_nat_info(ct, &daddr, dport, NF_NAT_MANIP_DST___local);
 
 		ct_ins = bpf_ct_insert_entry(ct);
 		if (ct_ins) {