Evgeniy Polyakov wrote: > On Mon, Aug 08, 2005 at 01:03:44AM +0200, Patrick McHardy ([EMAIL PROTECTED]) > wrote: > >>Yes, the patches are almost ready but I could use some ideas >>for one remaining problem. The idea was that a subsystem which >>sends broadcast messages can specify how many groups are present, >>probably as a parameter to netlink_kernel_create. This information >>is needed to properly size the groups mask in struct netlink_sock >>(this mask is still needed). The problem is that sockets can bind >>to groups before a kernel socket is created, or in the case of >>a userspace implemented protocol, none is ever created. To solve >>this we could forbid binding to groups before either a kernel >>socket is created or userspace has registered how many groups >>are present using setsockopt. The questions regarding this are >>if the bind-change could cause problems for userspace and whether >>we should take care of userspace implemented protocols at all or >>simply return -ESOCKTNOSUPPORT in netlink_create if no kernel >>socket exists. > > Should it be possible to specify remote groups in sending time? > I.e. netlink_broadcast(..., u32 *array_of_groups, int number_of_groups); > This will not hurt existing userspace applications.
Yes, but this is not the problem. There is no user of netlink_broadcast which sends to multiple groups. The problem is that binding to groups is possible before a kernel socket exists, so we don't know the number of groups. I would prefer to avoid reallocation of the group mask. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
