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authorEric Dumazet <eric.dumazet@gmail.com>2011-10-29 06:13:39 +0000
committerDavid S. Miller <davem@davemloft.net>2011-10-30 04:43:30 -0400
commit6a32e4f9dd9219261f8856f817e6655114cfec2f (patch)
tree964061ded76a2e5c9e2aa9122a3a88956db109c1 /net
parent14ef37b6d00eb5d06704e45989ba4c21e7be7673 (diff)
downloadlinux-6a32e4f9dd9219261f8856f817e6655114cfec2f.tar.bz2
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 <eric.dumazet@gmail.com> Reviewed-by: Jiri Pirko <jpirko@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/8021q/vlan_core.c7
-rw-r--r--net/core/dev.c4
2 files changed, 7 insertions, 4 deletions
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 <linux/netpoll.h>
#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);