From 6a32e4f9dd9219261f8856f817e6655114cfec2f Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sat, 29 Oct 2011 06:13:39 +0000 Subject: vlan: allow nested vlan_do_receive() commit 2425717b27eb (net: allow vlan traffic to be received under bond) broke ARP processing on vlan on top of bonding. +-------+ eth0 --| bond0 |---bond0.103 eth1 --| | +-------+ 52870.115435: skb_gro_reset_offset <-napi_gro_receive 52870.115435: dev_gro_receive <-napi_gro_receive 52870.115435: napi_skb_finish <-napi_gro_receive 52870.115435: netif_receive_skb <-napi_skb_finish 52870.115435: get_rps_cpu <-netif_receive_skb 52870.115435: __netif_receive_skb <-netif_receive_skb 52870.115436: vlan_do_receive <-__netif_receive_skb 52870.115436: bond_handle_frame <-__netif_receive_skb 52870.115436: vlan_do_receive <-__netif_receive_skb 52870.115436: arp_rcv <-__netif_receive_skb 52870.115436: kfree_skb <-arp_rcv Packet is dropped in arp_rcv() because its pkt_type was set to PACKET_OTHERHOST in the first vlan_do_receive() call, since no eth0.103 exists. We really need to change pkt_type only if no more rx_handler is about to be called for the packet. Signed-off-by: Eric Dumazet Reviewed-by: Jiri Pirko Signed-off-by: David S. Miller --- net/8021q/vlan_core.c | 7 +++++-- net/core/dev.c | 4 ++-- 2 files changed, 7 insertions(+), 4 deletions(-) (limited to 'net') diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c index f1f2f7bb6661..163397f1fd5a 100644 --- a/net/8021q/vlan_core.c +++ b/net/8021q/vlan_core.c @@ -4,7 +4,7 @@ #include #include "vlan.h" -bool vlan_do_receive(struct sk_buff **skbp) +bool vlan_do_receive(struct sk_buff **skbp, bool last_handler) { struct sk_buff *skb = *skbp; u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK; @@ -13,7 +13,10 @@ bool vlan_do_receive(struct sk_buff **skbp) vlan_dev = vlan_find_dev(skb->dev, vlan_id); if (!vlan_dev) { - if (vlan_id) + /* Only the last call to vlan_do_receive() should change + * pkt_type to PACKET_OTHERHOST + */ + if (vlan_id && last_handler) skb->pkt_type = PACKET_OTHERHOST; return false; } diff --git a/net/core/dev.c b/net/core/dev.c index edcf019c056d..6ba50a1e404c 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3283,18 +3283,18 @@ another_round: ncls: #endif + rx_handler = rcu_dereference(skb->dev->rx_handler); if (vlan_tx_tag_present(skb)) { if (pt_prev) { ret = deliver_skb(skb, pt_prev, orig_dev); pt_prev = NULL; } - if (vlan_do_receive(&skb)) + if (vlan_do_receive(&skb, !rx_handler)) goto another_round; else if (unlikely(!skb)) goto out; } - rx_handler = rcu_dereference(skb->dev->rx_handler); if (rx_handler) { if (pt_prev) { ret = deliver_skb(skb, pt_prev, orig_dev); -- cgit v1.2.3