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if_vlan: allow vlan and vlanproto to be changed

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It's currently not possible to change the vlan ID or vlan protocol (i.e.
802.1q vs. 802.1ad) without de-configuring the interface (i.e. ifconfig
vlanX -vlandev).
Add a specific flow for this, allowing both the protocol and id (but not
parent interface) to be changed without going through the '-vlandev'
step.

Reviewed by:	glebius
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D35846
This commit is contained in:
Kristof Provost 2022-07-19 00:23:50 +02:00
parent 000321bab7
commit 663f556b03
1 changed files with 18 additions and 2 deletions
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20
sys/net/if_vlan.c
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@ -1538,8 +1538,24 @@ vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t vid,
*/
if (vid == 0 || vid == 0xFFF || (vid & ~EVL_VLID_MASK))
return (EINVAL);
if (ifv->ifv_trunk)
return (EBUSY);
if (ifv->ifv_trunk) {
trunk = ifv->ifv_trunk;
if (trunk->parent != p)
return (EBUSY);
VLAN_XLOCK();
ifv->ifv_proto = proto;
if (ifv->ifv_vid != vid) {
/* Re-hash */
vlan_remhash(trunk, ifv);
ifv->ifv_vid = vid;
error = vlan_inshash(trunk, ifv);
}
/* Will unlock */
goto done;
}
VLAN_XLOCK();
if (p->if_vlantrunk == NULL) {