]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commitdiff
net/sched: em_meta: Fix 'meta vlan' to correctly recognize zero VID frames
authorShmulik Ladkani <shmulik.ladkani@gmail.com>
Thu, 20 Oct 2016 21:18:08 +0000 (00:18 +0300)
committerDavid S. Miller <davem@davemloft.net>
Sun, 23 Oct 2016 21:31:25 +0000 (17:31 -0400)
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>
net/sched/em_meta.c

index a309a07ccb3535453ce3235d3e6a91933282fc3f..41c80b6c39063afb726dac0b6f52022f82b25fa9 100644 (file)
@@ -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;
 }