V_irtualize the if_clone framework, thus allowing for clonable ifnets

to optionally have overlapping unit numbers if attached in different
vnets.

At this stage if_loop is the only clonable ifnet class that has been
extended to allow for such overlapping allocation of unit numbers, i.e.
in each vnet it is possible to have a lo0 interface.  Other clonable ifnet
classes remain to operate with traditional semantics, i.e. each instance
of a clonable ifnet will be assigned a globally unique unit number,
regardless in which vnet such an ifnet becomes instantiated.

While here, garbage collect unused _lo_list field in struct vnet_net,
as well as improve indentation for #defines in sys/net/vnet.h.

The layout of struct vnet_net has changed, therefore bump
__FreeBSD_version.

This change has no functional impact on nooptions VIMAGE kernel builds.

Reviewed by:	bz, brooks
Approved by:	julian (mentor)

1 files changed, 5 insertions, 0 deletions

diff --git a/sys/kern/kern_vimage.c b/sys/kern/kern_vimage.c
index d4c48b5..7cb6d84 100644
--- a/sys/kern/kern_vimage.c
+++ b/sys/kern/kern_vimage.c
@@ -66,6 +66,10 @@ struct vprocg vprocg_0;
 #endif
 #endif
 
+#ifdef VIMAGE
+struct vnet *vnet0;
+#endif
+
 void
 vnet_mod_register(const struct vnet_modinfo *vmi)
 {
@@ -331,6 +335,7 @@ vi_init(void *unused)
 	LIST_INSERT_HEAD(&vnet_head, vnet, vnet_le);
 	vnet->vnet_magic_n = VNET_MAGIC_N;
 	vip->v_net = vnet;
+	vnet0 = vnet;
 
 	/* We MUST clear curvnet in vi_init_done before going SMP. */
 	curvnet = LIST_FIRST(&vnet_head);