Date: Wed, 20 Oct 2004 17:34:26 GMT From: "Lenar D. Tukhvatullin" <blackv@netroad.ru> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/72933: promisc mode on vlan interface does not work correctly Message-ID: <200410201734.i9KHYQ1W012043@www.freebsd.org> Resent-Message-ID: <200410201740.i9KHeERx087324@freefall.freebsd.org>
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>Number: 72933
>Category: kern
>Synopsis: promisc mode on vlan interface does not work correctly
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Oct 20 17:40:14 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: Lenar D. Tukhvatullin
>Release: 5.3-STABLE
>Organization:
Ulyanovsk State Technical University
>Environment:
FreeBSD xxx.com 5.3-STABLE FreeBSD 5.3-STABLE #2: Wed Oct 20 12:22:08 MSD 2004 lenar@xxx.com:/usr/obj/usr/src/sys/GENERIC i386
FreeBSD 5.3-STABLE, RELENG_5 cvsup'ed at Oct 20 2004
>Description:
Promiscuous mode on vlan interface does not work if parent interface
supports VLAN_HWTAGGING. Probably bug in sys/net/if_ethersubr.c:650
(packet with non-parents ethernet-address is rejected by ether_demux)
>How-To-Repeat:
(bge0 supports VLAN_HW_TAGGING)
# ifconfig vlan0 create
# infconfig vlan0 vlan 1 vlandev bge0
# ifconfig bge0 up
# ifconfig vlan0 up
configure bridging beetwen vlan0 and another interface (bge1):
# ifconfig bge1 172.16.0.1 netmask 255.255.255.0
# kldload bridge
# sysctl.net.link.ether.bridge.config="vlan0 bge1"
# sysctl.net.link.ether.bridge.enable=1
log messages:
.. kernel: bge1: promiscuous mode enabled
.. kernel: bge0: promiscuous mode enabled
.. kernel: vlan0: promiscuous mode enabled
pinging host (172.16.0.2 located on bge0 side in vlan 1)
# ping 172.16.0.2
..
Host is down
Host is down
-----
tcpdump's in another console:
# tcpdump -e -i bge0
21:20:24.753738 00:08:02:91:d5:61 > Broadcast, ethertype ARP (0x0806), length 42: arp who-has 172.16
.0.2 tell 172.16.0.1
21:20:24.755528 00:11:20:11:34:c0 > 00:08:02:91:d5:61, ethertype ARP (0x0806), length 60: arp reply
172.16.0.2 is-at 00:11:20:11:34:c0
21:20:25.758096 00:08:02:91:d5:61 > Broadcast, ethertype ARP (0x0806), length 42: arp who-has 172.16
.0.2 tell 172.16.0.1
21:20:25.759672 00:11:20:11:34:c0 > 00:08:02:91:d5:61, ethertype ARP (0x0806), length 60: arp reply
172.16.0.2 is-at 00:11:20:11:34:c0
...
# tcpdump -e -i vlan0
21:22:35.649629 00:08:02:91:d5:61 > Broadcast, ethertype ARP (0x0806), length 42: arp who-has 172.16
.0.2 tell 172.16.0.1
21:22:36.650105 00:08:02:91:d5:61 > Broadcast, ethertype ARP (0x0806), length 42: arp who-has 172.16
.0.2 tell 172.16.0.1
..
-----
incoming packet on bge0 is not delivered to vlan0 interface.
>Fix:
fix sys/net/if_ethersubr.c:650 (in function ether_demux)
original:
!(ether_type == ETHERTYPE_VLAN && ifp->if_nvlans > 0)) {
fixed:
!((ether_type == ETHERTYPE_VLAN || m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL) != NULL) && ifp->if_nvlans > 0)) {
this is an example, may be fixed by other way...
>Release-Note:
>Audit-Trail:
>Unformatted:
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