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Re: [libvirt] [PATCH] nwfilter: Use -m conntrack rather than -m state



On 08/06/2013 09:52 AM, Stefan Berger wrote:
> Since iptables version 1.4.16 '-m state --state NEW' is converted to
> '-m conntrack --ctstate NEW'. Therefore, when encountering this or later
> versions of iptables use '-m conntrack --ctstate'.
> 
> Signed-off-by: Stefan Berger <stefanb linux vnet ibm com>
> 
> ---
>  src/nwfilter/nwfilter_ebiptables_driver.c |   50 +++++++++++++++++++++++++++++-
>  1 file changed, 49 insertions(+), 1 deletion(-)
> 
> Index: libvirt-acl/src/nwfilter/nwfilter_ebiptables_driver.c
> ===================================================================
> --- libvirt-acl.orig/src/nwfilter/nwfilter_ebiptables_driver.c
> +++ libvirt-acl/src/nwfilter/nwfilter_ebiptables_driver.c
> @@ -188,6 +188,9 @@ static const char ebiptables_script_set_
>  
>  static const char *m_state_out_str   = "-m state --state NEW,ESTABLISHED";
>  static const char *m_state_in_str    = "-m state --state ESTABLISHED";
> +static const char *m_state_out_str_new = "-m conntrack --ctstate NEW,ESTABLISHED";
> +static const char *m_state_in_str_new  = "-m conntrack --ctstate ESTABLISHED";
> +
>  static const char *m_physdev_in_str  = "-m physdev " PHYSDEV_IN;
>  static const char *m_physdev_out_str = "-m physdev " PHYSDEV_OUT;
>  static const char *m_physdev_out_old_str = "-m physdev " PHYSDEV_OUT_OLD;
> @@ -4353,6 +4356,49 @@ ebiptablesDriverProbeCtdir(void)
>          iptables_ctdir_corrected = CTDIR_STATUS_OLD;
>  }
>  
> +static void
> +ebiptablesDriverProbeStateMatch(void)
> +{
> +    virBuffer buf = VIR_BUFFER_INITIALIZER;
> +    char *cmdout = NULL, *version;
> +    unsigned long thisversion;
> +
> +    NWFILTER_SET_IPTABLES_SHELLVAR(&buf);
> +
> +    virBufferAsprintf(&buf,
> +                      "$IPT --version");
> +
> +    if (ebiptablesExecCLI(&buf, NULL, &cmdout) < 0) {
> +        VIR_ERROR(_("Testing of iptables command failed: %s"),
> +                  cmdout);
> +        return;
Probably should just goto cleanup since we'll need to free buf

> +    }
> +
> +    /*
> +     * we expect output in the format
> +     * iptables v1.4.16
> +     */
> +    if (!(version = strchr(cmdout, 'v')) &&
> +        virParseVersionString(version + 1, &thisversion, true) < 0) {
> +        VIR_ERROR(_("Could not determine iptables version from string %s"),
> +                  cmdout);
> +        goto cleanup;
> +    }
> +
> +    /*
> +     * since version 1.4.16 '-m state --state ...' will be converted to
> +     * '-m conntrack --ctstate ...'
> +     */
> +    if (thisversion > 1 * 1000000 + 4 * 1000 + 16) {
> +        m_state_out_str = m_state_out_str_new;
> +        m_state_in_str = m_state_in_str_new;
> +    }
> +
> +cleanup:

Need to free 'buf' too right?

    virBufferFreeAndReset(&buf);

Otherwise, seems fine though

John

> +    VIR_FREE(cmdout);
> +    return;
> +}
> +
>  static int
>  ebiptablesDriverInit(bool privileged)
>  {
> @@ -4390,8 +4436,10 @@ ebiptablesDriverInit(bool privileged)
>          return -ENOTSUP;
>      }
>  
> -    if (iptables_cmd_path)
> +    if (iptables_cmd_path) {
>          ebiptablesDriverProbeCtdir();
> +        ebiptablesDriverProbeStateMatch();
> +    }
>  
>      ebiptables_driver.flags = TECHDRV_FLAG_INITIALIZED;
>  
> 
> --
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> 


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