Commit 636c2628 authored by Shmulik Ladkani's avatar Shmulik Ladkani Committed by David S. Miller

net: skbuff: Remove errornous length validation in skb_vlan_pop()

In 93515d53
  "net: move vlan pop/push functions into common code"
skb_vlan_pop was moved from its private location in openvswitch to
skbuff common code.

In case skb has non hw-accel vlan tag, the original 'pop_vlan()' assured
that skb->len is sufficient (if skb->len < VLAN_ETH_HLEN then pop was
considered a no-op).

This validation was moved as is into the new common 'skb_vlan_pop'.

Alas, in its original location (openvswitch), there was a guarantee that
'data' points to the mac_header, therefore the 'skb->len < VLAN_ETH_HLEN'
condition made sense.
However there's no such guarantee in the generic 'skb_vlan_pop'.

For short packets received in rx path going through 'skb_vlan_pop',
this causes 'skb_vlan_pop' to fail pop-ing a valid vlan hdr (in the non
hw-accel case) or to fail moving next tag into hw-accel tag.

Remove the 'skb->len < VLAN_ETH_HLEN' condition entirely:
It is superfluous since inner '__skb_vlan_pop' already verifies there
are VLAN_ETH_HLEN writable bytes at the mac_header.

Note this presents a slight change to skb_vlan_pop() users:
In case total length is smaller than VLAN_ETH_HLEN, skb_vlan_pop() now
returns an error, as opposed to previous "no-op" behavior.
Existing callers (e.g. tc act vlan, ovs) usually drop the packet if
'skb_vlan_pop' fails.

Fixes: 93515d53 ("net: move vlan pop/push functions into common code")
Signed-off-by: default avatarShmulik Ladkani <shmulik.ladkani@gmail.com>
Cc: Pravin Shelar <pshelar@ovn.org>
Reviewed-by: default avatarPravin B Shelar <pshelar@ovn.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1fbafcb8
...@@ -4567,9 +4567,8 @@ int skb_vlan_pop(struct sk_buff *skb) ...@@ -4567,9 +4567,8 @@ int skb_vlan_pop(struct sk_buff *skb)
if (likely(skb_vlan_tag_present(skb))) { if (likely(skb_vlan_tag_present(skb))) {
skb->vlan_tci = 0; skb->vlan_tci = 0;
} else { } else {
if (unlikely((skb->protocol != htons(ETH_P_8021Q) && if (unlikely(skb->protocol != htons(ETH_P_8021Q) &&
skb->protocol != htons(ETH_P_8021AD)) || skb->protocol != htons(ETH_P_8021AD)))
skb->len < VLAN_ETH_HLEN))
return 0; return 0;
err = __skb_vlan_pop(skb, &vlan_tci); err = __skb_vlan_pop(skb, &vlan_tci);
...@@ -4577,9 +4576,8 @@ int skb_vlan_pop(struct sk_buff *skb) ...@@ -4577,9 +4576,8 @@ int skb_vlan_pop(struct sk_buff *skb)
return err; return err;
} }
/* move next vlan tag to hw accel tag */ /* move next vlan tag to hw accel tag */
if (likely((skb->protocol != htons(ETH_P_8021Q) && if (likely(skb->protocol != htons(ETH_P_8021Q) &&
skb->protocol != htons(ETH_P_8021AD)) || skb->protocol != htons(ETH_P_8021AD)))
skb->len < VLAN_ETH_HLEN))
return 0; return 0;
vlan_proto = skb->protocol; vlan_proto = skb->protocol;
......
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