[oe] [PATCH][meta-networking][V2] ebtables: make it be able to work on 64bit kernel with 32 bit userspace
Rongqing Li
rongqing.li at windriver.com
Wed Nov 19 02:10:11 UTC 2014
Please drop it, it make x86 unable to work
-Roy
On 2014年11月12日 10:01, rongqing.li at windriver.com wrote:
> From: "Roy.Li" <rongqing.li at windriver.com>
>
> Some structs, which is used to communicate between user space and kernel,
> have the alignment issue on 64bit kernel with 32 bit userspace. To fix
> this issue, ebtables redefines these struct, not use the kernel(sysroot)
> include/uapi/linux/netfilter_bridge/ebtables.h, like ebt_entry_target:
>
> The kernel's:
> struct ebt_entry_target {
> union {
> char name[EBT_FUNCTION_MAXNAMELEN];
> struct xt_target *target;
> } u;
> /* size of data */
> unsigned int target_size;
> unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
> };
>
> The ebtables:
> struct ebt_entry_target
> {
> union {
> char name[EBT_FUNCTION_MAXNAMELEN];
> struct ebt_target *target;
> } u;
> /* size of data */
> unsigned int target_size;
> |#ifdef KERNEL_64_USERSPACE_32
> unsigned int pad;
> |#endif
> unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
> };
>
> To make it work on 64bit kernel and 32bit userspace, KERNEL_64_USERSPACE_32
> is needed to be enabled.
>
> If the MLPREFIX of package matchs "lib.?32", the 32bit multilib package on
> 64bit kernel is being built.
>
> Signed-off-by: Roy.Li <rongqing.li at windriver.com>
> ---
> meta-networking/recipes-filter/ebtables/ebtables_2.0.10-4.bb | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/meta-networking/recipes-filter/ebtables/ebtables_2.0.10-4.bb b/meta-networking/recipes-filter/ebtables/ebtables_2.0.10-4.bb
> index 32cfc75..ca084e3 100644
> --- a/meta-networking/recipes-filter/ebtables/ebtables_2.0.10-4.bb
> +++ b/meta-networking/recipes-filter/ebtables/ebtables_2.0.10-4.bb
> @@ -27,6 +27,17 @@ S = "${WORKDIR}/ebtables-v${PV}"
>
> inherit update-rc.d systemd
>
> +python __anonymous () {
> + import re
> +
> + multilib = d.getVar('MLPREFIX', True)
> + if multilib:
> + searchstr = "lib.?32"
> + reg = re.compile(searchstr)
> + if reg.search(multilib):
> + d.appendVar('CFLAGS' ,' -DKERNEL_64_USERSPACE_32 -DEBT_MIN_ALIGN=8')
> +}
> +
> EXTRA_OEMAKE = " \
> BINDIR=${base_sbindir} \
> MANDIR=${mandir} \
>
--
Best Reagrds,
Roy | RongQing Li
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