diff options
| author | Shmulik Ladkani <shmulik.ladkani@gmail.com> | 2016-10-21 00:18:08 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-10-23 17:31:25 -0400 |
| commit | d65f2fa680d6f91438461df54c83a331b3a631c9 (patch) | |
| tree | af192e0efc27f4a65c5e3a0b48927a02c61dcdad | |
| parent | 1bac938141eea1fb5ef722d1d81ad440b3989ed3 (diff) | |
net/sched: em_meta: Fix 'meta vlan' to correctly recognize zero VID frames
META_COLLECTOR int_vlan_tag() assumes that if the accel tag (vlan_tci)
is zero, then no vlan accel tag is present.
This is incorrect for zero VID vlan accel packets, making the following
match fail:
tc filter add ... basic match 'meta(vlan mask 0xfff eq 0)' ...
Apparently 'int_vlan_tag' was implemented prior VLAN_TAG_PRESENT was
introduced in 05423b2 "vlan: allow null VLAN ID to be used"
(and at time introduced, the 'vlan_tx_tag_get' call in em_meta was not
adapted).
Fix, testing skb_vlan_tag_present instead of testing skb_vlan_tag_get's
value.
Fixes: 05423b2413 ("vlan: allow null VLAN ID to be used")
Fixes: 1a31f2042e ("netsched: Allow meta match on vlan tag on receive")
Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/sched/em_meta.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/net/sched/em_meta.c b/net/sched/em_meta.c index a309a07ccb35..41c80b6c3906 100644 --- a/net/sched/em_meta.c +++ b/net/sched/em_meta.c @@ -176,11 +176,12 @@ META_COLLECTOR(int_vlan_tag) { unsigned short tag; - tag = skb_vlan_tag_get(skb); - if (!tag && __vlan_get_tag(skb, &tag)) - *err = -1; - else + if (skb_vlan_tag_present(skb)) + dst->value = skb_vlan_tag_get(skb); + else if (!__vlan_get_tag(skb, &tag)) dst->value = tag; + else + *err = -1; } |