ifconfig vlan tag range

[Camiel Dobbelaar]

The valid range for vlan tags in OpenBSD is 0-4095 (inclusive).  Fix
both checks.

Makes vlan0 autoconfig work (obj/ifconfig has the diff):

# ifconfig vlan0 vlandev fxp0
ifconfig: invalid vlan tag and device specification

# obj/ifconfig vlan0 vlandev fxp0

and gives a better error message on tags > 4095:

# ifconfig vlan1 vlan 5000 vlandev fxp0
ifconfig: SIOCSETVLAN: Invalid argument

# obj/ifconfig vlan1 vlan 5000 vlandev fxp0
ifconfig: vlan tag 5000: too large

--
Cam
Index: ifconfig.c
===================================================================
RCS file: /cvs/src/sbin/ifconfig/ifconfig.c,v
retrieving revision 1.242
diff -u -r1.242 ifconfig.c
--- ifconfig.c  9 Nov 2010 21:14:47 -0000       1.242
+++ ifconfig.c  5 Feb 2011 14:28:56 -0000
@@ -3351,7 +3351,7 @@
        struct vlanreq vreq;
        const char *errmsg = NULL;
 
-       __tag = tag = strtonum(val, 0, 65535, &errmsg);
+       __tag = tag = strtonum(val, 0, 4095, &errmsg);
        if (errmsg)
                errx(1, "vlan tag %s: %s", val, errmsg);
        __have_tag = 1;
@@ -3411,7 +3411,7 @@
 
        if (!__have_tag && vreq.vlr_tag == 0) {
                skip = strcspn(ifr.ifr_name, "0123456789");
-               tag = strtonum(ifr.ifr_name + skip, 1, 4095, &estr);
+               tag = strtonum(ifr.ifr_name + skip, 0, 4095, &estr);
                if (estr != NULL)
                        errx(1, "invalid vlan tag and device specification");
                vreq.vlr_tag = tag;