Patch to /etc/rc.d/atm{1,2,3}

This patch does two things:

• Make atm2 from atm2.sh and atm3 from atm3.sh.

  The scripts are still missing real commands to stop ATM. This is not easy, because by design the ATM stuff is not supposed to be stopped. The two scripts have been .sh scripts formerly, because they needed to communicate variables from one to the other. This has been fixed by obtainig the list of interface in each script via atm(9).

  This also fixes a bug that was probably introduced by the split of rc.atm: atm1 also needed to communicated the list of physical interfaces to atm2. This has been fixed.

• Add support for the HARP pseudo-driver harp(4).

  This is tricky, because of the layering of drivers:

  • On the bottom there are real interfaces like patm(4), that are configured like ethernet interfaces via ifconfig.
  • On top of this is harp(4) which creates a HARP physical interface for each IFT_ATM type interface in the system. These interfaces live in their own namespace.
  • On top of these the ATM code creates normal network interfaces which, again, are configured via ifconfig.

  The problem that arises is that the real hardware interfaces must be brought up via 'ifconfig XatmN up' before atm1 is run. But netif must be run after atm1 because atm1 creates the network interfaces that are to be configured in netif.

  The patch hacks around the problem by using an additional rc.conf variable 'natm_interfaces'. atm1 does an 'ifconfig up' for all interfaces in this list.

• Support for loadable HARP drivers. Normal network interfaces are automatically kldloaded by ifconfig(8). HARP drivers need not to be configured, they are started as soon as they attach. Therefor they must be either compiled into the kernel or explicitely loaded. atm1 now loads all the drivers that are listed in the atm_load variable.

The patches

• rc.d.atm1.diff Add atm_load variable.
• rc.d.atm0.diff Original patch.