IfAPI: Added missing accessor for if_home_vnet

Reviewed by:	kp
Signed-off-by:	Kevin Irabor <kevin.irabor04@gmail.com>

share/man/man9/ifnet.9

@@ -26,7 +26,7 @@
 .\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd December 10, 2024
+.Dd September 29, 2025
 .Dt IFNET 9
 .Os
 .Sh NAME
@@ -253,6 +253,8 @@
 .Fn if_getlladdr "const if_t ifp"
 .Ft struct vnet *
 .Fn if_getvnet "const if_t ifp"
+.Ft struct vnet *
+.Fn if_gethomevnet "const if_t ifp"
 .Ft void *
 .Fn if_gethandle "u_char"
 .Ft void
@@ -516,6 +518,12 @@ or
 A pointer to the virtual network stack instance.
 This is initialized by
 .Fn if_attach .
+.It Fn if_gethomevnet
+.Pq Vt "struct vnet *"
+A pointer to the parent virtual network stack,
+where this struct ifnet originates from.
+This is initialized by
+.Fn if_attach .
 .It Fn if_gethandle
 .It Fn if_vlancap
 .It Fn if_getcounter

sys/net/if.c

@@ -5116,6 +5116,12 @@ if_getvnet(if_t ifp)
 	return (ifp->if_vnet);
 }
 
+struct vnet *
+if_gethomevnet(if_t ifp)
+{
+	return (ifp->if_home_vnet);
+}
+
 void *
 if_getafdata(if_t ifp, int af)
 {

sys/net/if_var.h

@@ -648,6 +648,7 @@ u_int16_t if_getvtag(struct mbuf *m);
 int if_vlantrunkinuse(if_t ifp);
 char *if_getlladdr(const if_t ifp);
 struct vnet *if_getvnet(const if_t ifp);
+struct vnet *if_gethomevnet(const if_t ifp);
 void *if_gethandle(u_char);
 void if_vlancap(if_t ifp);
 int if_transmit(if_t ifp, struct mbuf *m);