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[NETFILTER]: Fix fragmentation issues with bridge netfilter 

The conntrack code doesn't do re-fragmentation of defragmented packets
anymore but relies on fragmentation in the IP layer. Purely bridged
packets don't pass through the IP layer, so the bridge netfilter code
needs to take care of fragmentation itself.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-04-04 13:42:35 -07:00 committed by David S. Miller
parent 550e29bc96
commit 2e2f7aefa8
3 changed files with 15 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/ip.h
View File

@ -95,6 +95,7 @@ extern int ip_local_deliver(struct sk_buff *skb);
extern int ip_mr_input(struct sk_buff *skb); extern int ip_mr_input(struct sk_buff *skb);
extern int ip_output(struct sk_buff *skb); extern int ip_output(struct sk_buff *skb);
extern int ip_mc_output(struct sk_buff *skb); extern int ip_mc_output(struct sk_buff *skb);
extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
extern int ip_do_nat(struct sk_buff *skb); extern int ip_do_nat(struct sk_buff *skb);
extern void ip_send_check(struct iphdr *ip); extern void ip_send_check(struct iphdr *ip);
extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok); extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);

13
net/bridge/br_netfilter.c
View File

@ -765,6 +765,15 @@ out:
return NF_STOLEN; return NF_STOLEN;
} }
static int br_nf_dev_queue_xmit(struct sk_buff *skb)
{
if (skb->protocol == htons(ETH_P_IP) &&
skb->len > skb->dev->mtu &&
!(skb_shinfo(skb)->ufo_size || skb_shinfo(skb)->tso_size))
return ip_fragment(skb, br_dev_queue_push_xmit);
else
return br_dev_queue_push_xmit(skb);
}
/* PF_BRIDGE/POST_ROUTING ********************************************/ /* PF_BRIDGE/POST_ROUTING ********************************************/
static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb, static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
@ -824,7 +833,7 @@ static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
realoutdev = nf_bridge->netoutdev; realoutdev = nf_bridge->netoutdev;
#endif #endif
NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, realoutdev, NF_HOOK(pf, NF_IP_POST_ROUTING, skb, NULL, realoutdev,
br_dev_queue_push_xmit); br_nf_dev_queue_xmit);
return NF_STOLEN; return NF_STOLEN;
@ -869,7 +878,7 @@ static unsigned int ip_sabotage_out(unsigned int hook, struct sk_buff **pskb,
if ((out->hard_start_xmit == br_dev_xmit && if ((out->hard_start_xmit == br_dev_xmit &&
okfn != br_nf_forward_finish && okfn != br_nf_forward_finish &&
okfn != br_nf_local_out_finish && okfn != br_dev_queue_push_xmit) okfn != br_nf_local_out_finish && okfn != br_nf_dev_queue_xmit)
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
|| ((out->priv_flags & IFF_802_1Q_VLAN) && || ((out->priv_flags & IFF_802_1Q_VLAN) &&
VLAN_DEV_INFO(out)->real_dev->hard_start_xmit == br_dev_xmit) VLAN_DEV_INFO(out)->real_dev->hard_start_xmit == br_dev_xmit)

6
net/ipv4/ip_output.c
View File

@ -86,8 +86,6 @@
int sysctl_ip_default_ttl = IPDEFTTL; int sysctl_ip_default_ttl = IPDEFTTL;
static int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*));
/* Generate a checksum for an outgoing IP datagram. */ /* Generate a checksum for an outgoing IP datagram. */
__inline__ void ip_send_check(struct iphdr *iph) __inline__ void ip_send_check(struct iphdr *iph)
{ {
@ -421,7 +419,7 @@ static void ip_copy_metadata(struct sk_buff *to, struct sk_buff *from)
* single device frame, and queue such a frame for sending. * single device frame, and queue such a frame for sending.
*/ */
static int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*)) int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff*))
{ {
struct iphdr *iph; struct iphdr *iph;
int raw = 0; int raw = 0;
@ -673,6 +671,8 @@ fail:
return err; return err;
} }
EXPORT_SYMBOL(ip_fragment);
int int
ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
{ {