From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Phil Sutter <phil@nwl.cc>
Cc: netfilter-devel@vger.kernel.org
Subject: Re: [conntrack-tools PATCH] conntrack: Fix CIDR to mask conversion on Big Endian
Date: Tue, 3 Sep 2019 22:34:47 +0200 [thread overview]
Message-ID: <20190903203447.saqplkgbbxlajkqr@salvia> (raw)
In-Reply-To: <20190902164431.18398-1-phil@nwl.cc>
On Mon, Sep 02, 2019 at 06:44:31PM +0200, Phil Sutter wrote:
> Code assumed host architecture to be Little Endian. Instead produce a
> proper mask by pushing the set bits into most significant position and
> apply htonl() on the result.
>
> Fixes: 3f6a2e90936bb ("conntrack: add support for CIDR notation")
> Signed-off-by: Phil Sutter <phil@nwl.cc>
> ---
> src/conntrack.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/src/conntrack.c b/src/conntrack.c
> index c980a13f33d2c..baafcbd869c12 100644
> --- a/src/conntrack.c
> +++ b/src/conntrack.c
> @@ -2210,7 +2210,7 @@ nfct_build_netmask(uint32_t *dst, int b, int n)
> dst[i] = 0xffffffff;
> b -= 32;
> } else if (b > 0) {
> - dst[i] = (1 << b) - 1;
> + dst[i] = htonl(((1 << b) - 1) << (32 - b));
Simply this instead?
dst[i] = htonl(((1 << b) - 1);
> b = 0;
> } else {
> dst[i] = 0;
> --
> 2.22.0
>
next prev parent reply other threads:[~2019-09-03 20:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-02 16:44 [conntrack-tools PATCH] conntrack: Fix CIDR to mask conversion on Big Endian Phil Sutter
2019-09-03 20:34 ` Pablo Neira Ayuso [this message]
2019-09-04 6:53 ` Phil Sutter
2019-09-04 8:21 ` Florian Westphal
2019-09-04 9:31 ` Phil Sutter
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