From: Senthil Kumar Balasubramanian <senthilb@qubercomm.com>
To: Florian Westphal <fw@strlen.de>
Cc: Phil Sutter <phil@nwl.cc>,
netfilter-devel@vger.kernel.org, pablo@netfilter.org
Subject: Re: ebtables behaving weirdly on MIPS platform
Date: Thu, 30 Sep 2021 18:17:46 +0530 [thread overview]
Message-ID: <20210930123927.GA82795@QBC-Ruckus> (raw)
In-Reply-To: <20210930105223.GD2935@breakpoint.cc>
On Thu, Sep 30, 2021 at 12:52:23PM +0200, Florian Westphal wrote:
> Phil Sutter <phil@nwl.cc> wrote:
> > On Thu, Sep 30, 2021 at 11:53:32AM +0530, Senthil Kumar Balasubramanian wrote:
> > > However, dumping the data that goes to the kernel, we see a huge
> > > difference between MIPS and ARM..
> > >
> > > in ARM platform
> > > w_l->w:
> > > 0000 6e 66 6c 6f 67 00 ff b6 00 00 00 00 00 00 00 00 nflog...........
> > > 0010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> > > 0020 50 00 00 00 00 00 00 00 01 00 01 00 00 00 00 00 P...............
> > > 0030 45 4e 54 52 59 31 00 00 00 00 00 00 00 00 00 00 ENTRY1..........
> > > 0040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> > > 0050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> > > 0060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> > > 0070 00 00 00 00
> > >
> > > in tplink a6 (MIPS platform)
> > >
> > > w_l->w:
> > > 0000 6e 66 6c 6f 67 00 b2 e0 69 6d 69 74 20 65 78 63 nflog...imit exc
> > > 0010 65 65 64 65 64 00 56 69 72 74 75 61 6c 20 74 69 eeded.Virtual ti
> > > 0020 00 00 00 50 65 78 70 69 00 01 00 01 50 72 6f 66 ...Pexpi....Prof
> > > 0030 45 4e 54 52 59 31 00 69 6d 65 72 20 65 78 70 69 ENTRY1.imer expi
> > > 0040 72 65 64 00 57 69 6e 64 6f 77 20 63 68 61 6e 67 red.Window chang
> > > 0050 65 64 00 49 2f 4f 20 70 6f 73 73 69 62 6c 65 00 ed.I/O possible.
> > > 0060 50 6f 77 65 72 20 66 61 69 6c 75 72 65 00 42 61 Power failure.Ba
> > > 0070 64 20 73 79
> > > d sy
> > >
> > > Can you please let me know what's going wrong with this?
> >
> > Looks like the data structure contains garbage. Looking at ebtables
> > code, that seems likely as extension data structures are allocated using
> > malloc() and never set zero. init() function in ebt_nflog.c only
> > initializes prefix, group and threshold fields (which seem to be set
> > correctly in your MIPS dump).
>
> Yes, probably pure luck (libc differences and the like).
>
> Senthil, can you try this patch (compile tested only)?
Yes. this patch work... Good and quick catch..
next prev parent reply other threads:[~2021-09-30 12:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-30 6:23 ebtables behaving weirdly on MIPS platform Senthil Kumar Balasubramanian
2021-09-30 10:38 ` Phil Sutter
2021-09-30 10:52 ` Florian Westphal
2021-09-30 12:47 ` Senthil Kumar Balasubramanian [this message]
2021-09-30 13:02 ` Florian Westphal
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