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bridge: move mac header copying into br_netfilter 

The mac header only has to be copied back into the skb for
fragments generated by ip_fragment(), which only happens
for bridge forwarded packets with nf-call-iptables=1 && active nf_defrag.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2015-03-05 00:52:33 +01:00 committed by Pablo Neira Ayuso
parent 1cae565e8b
commit 8bd63cf1a4
3 changed files with 29 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
include/linux/netfilter_bridge.h
View File

@ -44,36 +44,6 @@ static inline void nf_bridge_update_protocol(struct sk_buff *skb)
skb->protocol = htons(ETH_P_PPP_SES);
}
/* Fill in the header for fragmented IP packets handled by
* the IPv4 connection tracking code.
*
* Only used in br_forward.c
*/
static inline int nf_bridge_copy_header(struct sk_buff *skb)
{
int err;
unsigned int header_size;
nf_bridge_update_protocol(skb);
header_size = ETH_HLEN + nf_bridge_encap_header_len(skb);
err = skb_cow_head(skb, header_size);
if (err)
return err;
skb_copy_to_linear_data_offset(skb, -header_size,
skb->nf_bridge->data, header_size);
__skb_push(skb, nf_bridge_encap_header_len(skb));
return 0;
}
static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
{
if (skb->nf_bridge &&
skb->nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))
return nf_bridge_copy_header(skb);
return 0;
}
static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
{
if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))
@ -119,7 +89,6 @@ static inline void br_drop_fake_rtable(struct sk_buff *skb)
}
#else
#define nf_bridge_maybe_copy_header(skb) (0)
#define nf_bridge_pad(skb) (0)
#define br_drop_fake_rtable(skb) do { } while (0)
#endif /* CONFIG_BRIDGE_NETFILTER */

4
net/bridge/br_forward.c
View File

@ -37,9 +37,7 @@ static inline int should_deliver(const struct net_bridge_port *p,
int br_dev_queue_push_xmit(struct sk_buff *skb)
{
/* ip_fragment doesn't copy the MAC header */
if (nf_bridge_maybe_copy_header(skb) ||
!is_skb_forwardable(skb->dev, skb)) {
if (!is_skb_forwardable(skb->dev, skb)) {
kfree_skb(skb);
} else {
skb_push(skb, ETH_HLEN);

29
net/bridge/br_netfilter.c
View File

@ -764,6 +764,33 @@ static unsigned int br_nf_forward_arp(const struct nf_hook_ops *ops,
}
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4)
static bool nf_bridge_copy_header(struct sk_buff *skb)
{
int err;
unsigned int header_size;
nf_bridge_update_protocol(skb);
header_size = ETH_HLEN + nf_bridge_encap_header_len(skb);
err = skb_cow_head(skb, header_size);
if (err)
return false;
skb_copy_to_linear_data_offset(skb, -header_size,
skb->nf_bridge->data, header_size);
__skb_push(skb, nf_bridge_encap_header_len(skb));
return true;
}
static int br_nf_push_frag_xmit(struct sk_buff *skb)
{
if (!nf_bridge_copy_header(skb)) {
kfree_skb(skb);
return 0;
}
return br_dev_queue_push_xmit(skb);
}
static int br_nf_dev_queue_xmit(struct sk_buff *skb)
{
int ret;
@ -780,7 +807,7 @@ static int br_nf_dev_queue_xmit(struct sk_buff *skb)
/* Drop invalid packet */
return NF_DROP;
IPCB(skb)->frag_max_size = frag_max_size;
ret = ip_fragment(skb, br_dev_queue_push_xmit);
ret = ip_fragment(skb, br_nf_push_frag_xmit);
} else
ret = br_dev_queue_push_xmit(skb);