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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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7
include/linux/netfilter_bridge.h
View file

@ -20,13 +20,6 @@ enum nf_br_hook_priorities {
#define BRNF_BRIDGED_DNAT 0x02
#define BRNF_NF_BRIDGE_PREROUTING 0x08
static inline 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;
}
int br_handle_frame_finish(struct sock *sk, struct sk_buff *skb);
static inline void br_drop_fake_rtable(struct sk_buff *skb)

7
net/bridge/br_netfilter.c
View file

@ -936,6 +936,13 @@ static int br_nf_ip_fragment(struct sock *sk, struct sk_buff *skb,
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;

4
net/ipv4/ip_output.c
View file

@ -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: