[PATCH v3] extensions: libxt_hashlimit: fix uint64_t printf formats

[PATCH v3] extensions: libxt_hashlimit: fix uint64_t printf formats

[Alin Nastac]

From: Alin Nastac <alin.nastac@gmail.com>

The remaining %llu formats are used for unsigned long long values.

Signed-off-by: Alin Nastac <alin.nastac@gmail.com>
---
 extensions/libxt_hashlimit.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/extensions/libxt_hashlimit.c b/extensions/libxt_hashlimit.c
index 9e63e1e..d7de540 100644
--- a/extensions/libxt_hashlimit.c
+++ b/extensions/libxt_hashlimit.c
@@ -736,7 +736,7 @@ hashlimit_mt_print(const struct hashlimit_cfg2 *cfg, unsigned int dmask, int rev
 		quantum = print_bytes(cfg->avg, cfg->burst, "");
 	} else {
 		quantum = print_rate(cfg->avg, revision);
-		printf(" burst %llu", cfg->burst);
+		printf(" burst %"PRIu64, cfg->burst);
 	}
 	if (cfg->mode & (XT_HASHLIMIT_HASH_SIP | XT_HASHLIMIT_HASH_SPT |
 	    XT_HASHLIMIT_HASH_DIP | XT_HASHLIMIT_HASH_DPT)) {
@@ -846,7 +846,7 @@ hashlimit_mt_save(const struct hashlimit_cfg2 *cfg, const char* name, unsigned i
 		quantum = print_bytes(cfg->avg, cfg->burst, "--hashlimit-");
 	} else {
 		quantum = print_rate(cfg->avg, revision);
-		printf(" --hashlimit-burst %llu", cfg->burst);
+		printf(" --hashlimit-burst %"PRIu64, cfg->burst);
 	}
 
 	if (cfg->mode & (XT_HASHLIMIT_HASH_SIP | XT_HASHLIMIT_HASH_SPT |
@@ -942,7 +942,7 @@ static void print_packets_rate_xlate(struct xt_xlate *xl, uint64_t avg,
 		    _rates[i].mult / avg < _rates[i].mult % avg)
 			break;
 
-	xt_xlate_add(xl, " %llu/%s burst %lu packets",
+	xt_xlate_add(xl, " %"PRIu64"/%s burst %"PRIu64" packets",
 		     _rates[i-1].mult / avg, _rates[i-1].name, burst);
 }
 
-- 
2.7.4

Re: [PATCH v3] extensions: libxt_hashlimit: fix uint64_t printf formats

[Pablo Neira Ayuso]

On Wed, May 24, 2017 at 09:13:58AM +0200, Alin Nastac wrote:
> From: Alin Nastac <alin.nastac@gmail.com>
>
> The remaining %llu formats are used for unsigned long long values.

Hm, still problems here:

libxt_hashlimit.c: In function ‘hashlimit_mt_print’:
libxt_hashlimit.c:739:3: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘__u64’ [-Wformat=]   printf(" burst %"PRIu64, cfg->burst);
   printf(" burst %"PRIu64, cfg->burst);
   ^
libxt_hashlimit.c: In function ‘hashlimit_mt_save’:
libxt_hashlimit.c:849:3: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘__u64’ [-Wformat=]
   printf(" --hashlimit-burst %"PRIu64, cfg->burst);

Re: [PATCH v3] extensions: libxt_hashlimit: fix uint64_t printf formats

[Alin Năstac]

On Mon, May 29, 2017 at 2:02 PM, Pablo Neira Ayuso <pablo@netfilter.org> wrote:
> On Wed, May 24, 2017 at 09:13:58AM +0200, Alin Nastac wrote:
>> From: Alin Nastac <alin.nastac@gmail.com>
>>
>> The remaining %llu formats are used for unsigned long long values.
>
> Hm, still problems here:
>
> libxt_hashlimit.c: In function ‘hashlimit_mt_print’:
> libxt_hashlimit.c:739:3: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘__u64’ [-Wformat=]   printf(" burst %"PRIu64, cfg->burst);
>    printf(" burst %"PRIu64, cfg->burst);
>    ^
> libxt_hashlimit.c: In function ‘hashlimit_mt_save’:
> libxt_hashlimit.c:849:3: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘__u64’ [-Wformat=]
>    printf(" --hashlimit-burst %"PRIu64, cfg->burst);

That's odd, burst field of hashlimit_cfg2 struct is supposed to be an
__u64 integer (see include/linux/netfilter/xt_hashlimit.h line 68).
Probably you include the wrong header file.

Re: [PATCH v3] extensions: libxt_hashlimit: fix uint64_t printf formats

[Pablo Neira Ayuso]

On Mon, May 29, 2017 at 02:11:39PM +0200, Alin Năstac wrote:
> On Mon, May 29, 2017 at 2:02 PM, Pablo Neira Ayuso <pablo@netfilter.org> wrote:
> > On Wed, May 24, 2017 at 09:13:58AM +0200, Alin Nastac wrote:
> >> From: Alin Nastac <alin.nastac@gmail.com>
> >>
> >> The remaining %llu formats are used for unsigned long long values.
> >
> > Hm, still problems here:
> >
> > libxt_hashlimit.c: In function ‘hashlimit_mt_print’:
> > libxt_hashlimit.c:739:3: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘__u64’ [-Wformat=]   printf(" burst %"PRIu64, cfg->burst);
> >    printf(" burst %"PRIu64, cfg->burst);
> >    ^
> > libxt_hashlimit.c: In function ‘hashlimit_mt_save’:
> > libxt_hashlimit.c:849:3: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘__u64’ [-Wformat=]
> >    printf(" --hashlimit-burst %"PRIu64, cfg->burst);
> 
> That's odd, burst field of hashlimit_cfg2 struct is supposed to be an
> __u64 integer (see include/linux/netfilter/xt_hashlimit.h line 68).
> Probably you include the wrong header file.

Yes, this is strange. I'm just giving a quick compilation test on my
laptop using the git tree and I hit this. Hm.

Re: [PATCH v3] extensions: libxt_hashlimit: fix uint64_t printf formats

[Alin Năstac]

On Mon, May 29, 2017 at 2:02 PM, Pablo Neira Ayuso <pablo@netfilter.org> wrote:
> On Wed, May 24, 2017 at 09:13:58AM +0200, Alin Nastac wrote:
>> From: Alin Nastac <alin.nastac@gmail.com>
>>
>> The remaining %llu formats are used for unsigned long long values.
>
> Hm, still problems here:
>
> libxt_hashlimit.c: In function ‘hashlimit_mt_print’:
> libxt_hashlimit.c:739:3: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘__u64’ [-Wformat=]   printf(" burst %"PRIu64, cfg->burst);
>    printf(" burst %"PRIu64, cfg->burst);
>    ^
> libxt_hashlimit.c: In function ‘hashlimit_mt_save’:
> libxt_hashlimit.c:849:3: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘__u64’ [-Wformat=]
>    printf(" --hashlimit-burst %"PRIu64, cfg->burst);

On second thought, seems that "%"PRIu64 is equivalent in your case
with "%lu". Maybe it is better to replace all %"PRIu64" with %llu.
After all, uint64_t is supposed to be unsigned long long on all
architectures, isn't it so?

Re: [PATCH v3] extensions: libxt_hashlimit: fix uint64_t printf formats

[Pablo Neira Ayuso]

On Mon, May 29, 2017 at 02:18:51PM +0200, Alin Năstac wrote:
> On Mon, May 29, 2017 at 2:02 PM, Pablo Neira Ayuso <pablo@netfilter.org> wrote:
> > On Wed, May 24, 2017 at 09:13:58AM +0200, Alin Nastac wrote:
> >> From: Alin Nastac <alin.nastac@gmail.com>
> >>
> >> The remaining %llu formats are used for unsigned long long values.
> >
> > Hm, still problems here:
> >
> > libxt_hashlimit.c: In function ‘hashlimit_mt_print’:
> > libxt_hashlimit.c:739:3: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘__u64’ [-Wformat=]   printf(" burst %"PRIu64, cfg->burst);
> >    printf(" burst %"PRIu64, cfg->burst);
> >    ^
> > libxt_hashlimit.c: In function ‘hashlimit_mt_save’:
> > libxt_hashlimit.c:849:3: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘__u64’ [-Wformat=]
> >    printf(" --hashlimit-burst %"PRIu64, cfg->burst);
> 
> On second thought, seems that "%"PRIu64 is equivalent in your case
> with "%lu". Maybe it is better to replace all %"PRIu64" with %llu.
> After all, uint64_t is supposed to be unsigned long long on all
> architectures, isn't it so?

long unsigned int here is 64-bits. But it takes processor word size.

I'm inclined to think we should just cast the __u64 to uint64_t to
sort out this, and use PRIu64.