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Subject[PATCH v2] flow_dissector: Fix vlan header offset in __skb_flow_dissect
Date
We build vlan on top of bonding interface, which vlan offload
is off, bond mode is 802.3ad (LACP) and xmit_hash_policy is
BOND_XMIT_POLICY_ENCAP34.

__skb_flow_dissect() fails to get information from protocol headers
encapsulated within vlan, because 'nhoff' is points to IP header,
so bond hashing is based on layer 2 info, which fails to distribute
packets across slaves.

Fixes: d5709f7ab776 ("flow_dissector: For stripped vlan, get vlan info from skb->vlan_tci")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
v2: remove redundant spaces
---
net/core/flow_dissector.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 01ad60b..ff85934 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -998,6 +998,9 @@ bool __skb_flow_dissect(const struct net *net,
skb && skb_vlan_tag_present(skb)) {
proto = skb->protocol;
} else {
+ if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX)
+ nhoff -= sizeof(*vlan);
+
vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
data, hlen, &_vlan);
if (!vlan) {
--
2.7.4

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