Stephen Hemminger wrote:
> It would be better to account for the tag in the length check.
> Something like
> if (skb->protocol == htons(ETH_P_IP) &&
> skb->len > skb->dev->mtu - (IS_VLAN_IP(skb) ? VLAN_HLEN : 0) &&
> !skb_is_gso(skb))
> return ip_fragment ...
It isn't good solution because one of IS_VLAN_IP() necessary condition is
skb->protocol == htons(ETH_P_8021Q)
which is, of course, mutually exclusive with
skb->protocol == htons(ETH_P_IP)
from br_nf_dev_queue_xmit(). IMHO, one should check length of ETH_P_IP
and ETH_P_8021Q frames separately:
if (((skb->protocol == htons(ETH_P_IP) && skb->len > skb->dev->mtu) ||
(IS_VLAN_IP(skb) && skb->len > skb->dev->mtu - VLAN_HLEN)) &&
!skb_is_gso(skb))
return ip_fragment ...
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