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Diffstat (limited to 'net/core')
-rw-r--r--net/core/netfilter.c66
1 files changed, 54 insertions, 12 deletions
diff --git a/net/core/netfilter.c b/net/core/netfilter.c
index 9849357f612..1ed4f311042 100644
--- a/net/core/netfilter.c
+++ b/net/core/netfilter.c
@@ -53,6 +53,9 @@ static struct nf_queue_handler_t {
nf_queue_outfn_t outfn;
void *data;
} queue_handler[NPROTO];
+
+static struct nf_queue_rerouter *queue_rerouter;
+
static DEFINE_RWLOCK(queue_handler_lock);
int nf_register_hook(struct nf_hook_ops *reg)
@@ -260,11 +263,34 @@ int nf_unregister_queue_handler(int pf)
return 0;
}
+int nf_register_queue_rerouter(int pf, struct nf_queue_rerouter *rer)
+{
+ if (pf >= NPROTO)
+ return -EINVAL;
+
+ write_lock_bh(&queue_handler_lock);
+ memcpy(&queue_rerouter[pf], rer, sizeof(queue_rerouter[pf]));
+ write_unlock_bh(&queue_handler_lock);
+
+ return 0;
+}
+
+int nf_unregister_queue_rerouter(int pf)
+{
+ if (pf >= NPROTO)
+ return -EINVAL;
+
+ write_lock_bh(&queue_handler_lock);
+ memset(&queue_rerouter[pf], 0, sizeof(queue_rerouter[pf]));
+ write_unlock_bh(&queue_handler_lock);
+ return 0;
+}
+
/*
* Any packet that leaves via this function must come back
* through nf_reinject().
*/
-static int nf_queue(struct sk_buff *skb,
+static int nf_queue(struct sk_buff **skb,
struct list_head *elem,
int pf, unsigned int hook,
struct net_device *indev,
@@ -282,17 +308,17 @@ static int nf_queue(struct sk_buff *skb,
read_lock(&queue_handler_lock);
if (!queue_handler[pf].outfn) {
read_unlock(&queue_handler_lock);
- kfree_skb(skb);
+ kfree_skb(*skb);
return 1;
}
- info = kmalloc(sizeof(*info), GFP_ATOMIC);
+ info = kmalloc(sizeof(*info)+queue_rerouter[pf].rer_size, GFP_ATOMIC);
if (!info) {
if (net_ratelimit())
printk(KERN_ERR "OOM queueing packet %p\n",
- skb);
+ *skb);
read_unlock(&queue_handler_lock);
- kfree_skb(skb);
+ kfree_skb(*skb);
return 1;
}
@@ -311,15 +337,21 @@ static int nf_queue(struct sk_buff *skb,
if (outdev) dev_hold(outdev);
#ifdef CONFIG_BRIDGE_NETFILTER
- if (skb->nf_bridge) {
- physindev = skb->nf_bridge->physindev;
+ if ((*skb)->nf_bridge) {
+ physindev = (*skb)->nf_bridge->physindev;
if (physindev) dev_hold(physindev);
- physoutdev = skb->nf_bridge->physoutdev;
+ physoutdev = (*skb)->nf_bridge->physoutdev;
if (physoutdev) dev_hold(physoutdev);
}
#endif
+ if (queue_rerouter[pf].save)
+ queue_rerouter[pf].save(*skb, info);
+
+ status = queue_handler[pf].outfn(*skb, info, queue_handler[pf].data);
+
+ if (status >= 0 && queue_rerouter[pf].reroute)
+ status = queue_rerouter[pf].reroute(skb, info);
- status = queue_handler[pf].outfn(skb, info, queue_handler[pf].data);
read_unlock(&queue_handler_lock);
if (status < 0) {
@@ -332,9 +364,11 @@ static int nf_queue(struct sk_buff *skb,
#endif
module_put(info->elem->owner);
kfree(info);
- kfree_skb(skb);
+ kfree_skb(*skb);
+
return 1;
}
+
return 1;
}
@@ -365,7 +399,7 @@ next_hook:
ret = -EPERM;
} else if (verdict == NF_QUEUE) {
NFDEBUG("nf_hook: Verdict = QUEUE.\n");
- if (!nf_queue(*pskb, elem, pf, hook, indev, outdev, okfn))
+ if (!nf_queue(pskb, elem, pf, hook, indev, outdev, okfn))
goto next_hook;
}
unlock:
@@ -428,7 +462,7 @@ void nf_reinject(struct sk_buff *skb, struct nf_info *info,
break;
case NF_QUEUE:
- if (!nf_queue(skb, elem, info->pf, info->hook,
+ if (!nf_queue(&skb, elem, info->pf, info->hook,
info->indev, info->outdev, info->okfn))
goto next_hook;
break;
@@ -555,6 +589,12 @@ void __init netfilter_init(void)
{
int i, h;
+ queue_rerouter = kmalloc(NPROTO * sizeof(struct nf_queue_rerouter),
+ GFP_KERNEL);
+ if (!queue_rerouter)
+ panic("netfilter: cannot allocate queue rerouter array\n");
+ memset(queue_rerouter, 0, NPROTO * sizeof(struct nf_queue_rerouter));
+
for (i = 0; i < NPROTO; i++) {
for (h = 0; h < NF_MAX_HOOKS; h++)
INIT_LIST_HEAD(&nf_hooks[i][h]);
@@ -573,4 +613,6 @@ EXPORT_SYMBOL(nf_reinject);
EXPORT_SYMBOL(nf_setsockopt);
EXPORT_SYMBOL(nf_unregister_hook);
EXPORT_SYMBOL(nf_unregister_queue_handler);
+EXPORT_SYMBOL_GPL(nf_register_queue_rerouter);
+EXPORT_SYMBOL_GPL(nf_unregister_queue_rerouter);
EXPORT_SYMBOL(nf_unregister_sockopt);