net: ip_fragment: remove BRIDGE_NETFILTER mtu special handling
since commit d6b915e29f4adea9
("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>
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index 535f9da..1e62ae5 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -936,6 +936,13 @@
return ip_do_fragment(sk, skb, output);
}
+static unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
+{
+ if (skb->nf_bridge->orig_proto == BRNF_PROTO_PPPOE)
+ return PPPOE_SES_HLEN;
+ return 0;
+}
+
static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb)
{
struct nf_bridge_info *nf_bridge;
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index f5f5ef1..19d7e43 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -549,10 +549,6 @@
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: