From ef5c89967d50042b29937fb724e057c1aa3c5207 Mon Sep 17 00:00:00 2001 From: "sg.tweak@gmail.com" Date: Wed, 10 Jun 2009 09:55:02 +0000 Subject: [PATCH] drivers/net/macvlan.c: fix cloning of tagged VLAN interfaces Addresses http://bugzilla.kernel.org/show_bug.cgi?id=13348 akpm: the reporter disappeared, so I typed it in again. It is not possible to make clone of tagged VLAN interface to be used as mac-based vlan interfave. How reproducible: Use any 802.1q tagged vlan interface, e.g. eth2.700 and clone it: ip link add link eth2.700 address 00:04:75:cb:38:09 macvlan0 type macvlan ip link set dev macvlan0 up ip addr add 10.195.1.1/24 dev macvlan0 So far, so good. Now try to ping anything via macvlan0: ping 10.195.1.2 Actual results: For every attempted packet tx kernel writes to console: ------------[ cut here ]------------ WARNING: at net/8021q/vlan_dev.c:254 vlan_dev_hard_header+0x36/0x126 [8021q]() Hardware name: M22ES Modules linked in: arptable_filter arp_tables bridge veth macvlan arc4 ecb ppp_mppe ppp_async crc_ccitt ppp_generic slhc autofs4 sunrpc 8021q garp stp ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_tcpudp x_tables dm_mirror dm_region_hash dm_log dm_multipath dm_mod sbs sbshc lp floppy snd_intel8x0 joydev snd_seq_dummy snd_intel8x0m snd_ac97_codec ide_cd_mod ac97_bus snd_seq_oss cdrom snd_seq_midi_event serio_raw snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss parport_pc snd_pcm parport battery 8139cp snd_timer i2c_sis96x ac button snd rtc_cmos rtc_core 8139too soundcore rtc_lib mii i2c_core pcspkr snd_page_alloc pata_sis libata sd_mod scsi_mod ext3 jbd ehci_hcd ohci_hcd uhci_hcd [last unloaded: ip_tables] Pid: 0, comm: swapper Tainted: G W 2.6.29.3 #1 Call Trace: [] warn_slowpath+0x60/0x9f [] warn_slowpath+0x87/0x9f [] vlan_dev_hard_header+0x0/0x126 [8021q] [] vlan_dev_hard_header+0x36/0x126 [8021q] [] vlan_dev_hard_header+0x0/0x126 [8021q] [] macvlan_hard_header+0x3c/0x47 [macvlan] [] macvlan_hard_header+0x0/0x47 [macvlan] [] arp_create+0xef/0x1ff [] arp_send+0x3d/0x54 [] arp_solicit+0x16c/0x177 [] neigh_timer_handler+0x227/0x269 [] neigh_timer_handler+0x0/0x269 [] run_timer_softirq+0xf0/0x141 [] __do_softirq+0x76/0xf8 [] __do_softirq+0x0/0xf8 [] handle_level_irq+0x0/0xad [] irq_exit+0x35/0x62 [] do_IRQ+0xdf/0xf4 [] common_interrupt+0x27/0x2c [] default_idle+0x2a/0x3d [] cpu_idle+0x57/0x70 Macvlan driver always uses standard ethernet header length for all types of interface to which it is linked. This patch fixes this problem. Reported-by: Cc: Alan Cox Cc: "Rafael J. Wysocki" Cc: "David S. Miller" Cc: Stephen Hemminger Signed-off-by: Andrew Morton Signed-off-by: David S. Miller --- drivers/net/macvlan.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index 021d9941c292..99eed9f37c84 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -359,6 +359,7 @@ static int macvlan_init(struct net_device *dev) (lowerdev->state & MACVLAN_STATE_MASK); dev->features = lowerdev->features & MACVLAN_FEATURES; dev->iflink = lowerdev->ifindex; + dev->hard_header_len = lowerdev->hard_header_len; macvlan_set_lockdep_class(dev); -- 2.20.1