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net: ip_fragment: remove BRIDGE_NETFILTER mtu special handling

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since commit d6b915e29f
("ip_fragment: don't forward defragmented DF packet") the largest
fragment size is available in the IPCB.

Therefore we no longer need to care about 'encapsulation'
overhead of stripped PPPOE/VLAN headers since ip_do_fragment
doesn't use device mtu in such cases.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal
2015-06-05 13:28:38 +02:00
committed by Pablo Neira Ayuso
parent efb6de9b4b
commit 33b1f31392
3 changed files with 7 additions and 11 deletions
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4
net/ipv4/ip_output.c
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@@ -549,10 +549,6 @@ int ip_do_fragment(struct sock *sk, struct sk_buff *skb,
hlen = iph->ihl * 4;
mtu = mtu - hlen; /* Size of data space */
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (skb->nf_bridge)
mtu -= nf_bridge_mtu_reduction(skb);
#endif
IPCB(skb)->flags |= IPSKB_FRAG_COMPLETE;
/* When frag_list is given, use it. First, check its validity: