From 630aba4aea40201ebeff7a6ccead86b65ec89b0d Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Mon, 7 Feb 2011 19:20:55 +0000 Subject: [PATCH] bonding/vlan: Avoid mangled NAs on slaves without VLAN tag insertion This is related to commit f88a4a9b65a6f3422b81be995535d0e69df11bb8 upstream, but the bug cannot be properly fixed without the other changes to VLAN tagging in 2.6.37. bond_na_send() attempts to insert a VLAN tag in between building and sending packets of the respective formats. If the slave does not implement hardware VLAN tag insertion then vlan_put_tag() will mangle the network-layer header because the Ethernet header is not present at this point (unlike in bond_arp_send()). Signed-off-by: Ben Hutchings Acked-by: David S. Miller Signed-off-by: Greg Kroah-Hartman Signed-off-by: Paul Gortmaker --- drivers/net/bonding/bond_ipv6.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/net/bonding/bond_ipv6.c b/drivers/net/bonding/bond_ipv6.c index 6dd64cf3cb76..a131d6f82176 100644 --- a/drivers/net/bonding/bond_ipv6.c +++ b/drivers/net/bonding/bond_ipv6.c @@ -69,6 +69,13 @@ static void bond_na_send(struct net_device *slave_dev, }; struct sk_buff *skb; + /* The Ethernet header is built in ndisc_send_skb(), not + * ndisc_build_skb(), so we cannot insert a VLAN tag. Only an + * out-of-line tag inserted by the hardware will work. + */ + if (vlan_id && !(slave_dev->features & NETIF_F_HW_VLAN_TX)) + return; + icmp6h.icmp6_router = router; icmp6h.icmp6_solicited = 0; icmp6h.icmp6_override = 1; @@ -87,7 +94,7 @@ static void bond_na_send(struct net_device *slave_dev, } if (vlan_id) { - skb = vlan_put_tag(skb, vlan_id); + skb = __vlan_hwaccel_put_tag(skb, vlan_id); if (!skb) { pr_err("failed to insert VLAN tag\n"); return; -- 2.39.5