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Commit 394f545d authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

[NETFILTER]: nf_queue: handle GSO packets 



Handle GSO packets in nf_queue by segmenting them before queueing to
avoid breaking GSO in case they get mangled.

Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4cf411de

net/netfilter/core.c

+1 −1
Original line number Diff line number Diff line
@@ -182,7 +182,7 @@ int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb, 
		ret = -EPERM;

	} else if ((verdict & NF_VERDICT_MASK)  == 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,

			      verdict >> NF_VERDICT_BITS))

			goto next_hook;

	}

net/netfilter/nf_internals.h

+1 −1
Original line number Diff line number Diff line
@@ -23,7 +23,7 @@ extern unsigned int nf_iterate(struct list_head *head, 
				int hook_thresh);



/* nf_queue.c */

extern int nf_queue(struct sk_buff **skb, 

extern int nf_queue(struct sk_buff *skb,

		    struct list_head *elem, 

		    int pf, unsigned int hook,

		    struct net_device *indev,

net/netfilter/nf_queue.c

+60 −20
Original line number Diff line number Diff line
@@ -74,7 +74,7 @@ EXPORT_SYMBOL_GPL(nf_unregister_queue_handlers); 
 * Any packet that leaves via this function must come back 

 * through nf_reinject().

 */

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,
@@ -94,14 +94,14 @@ int nf_queue(struct sk_buff **skb, 
	read_lock(&queue_handler_lock);

	if (!queue_handler[pf]) {

		read_unlock(&queue_handler_lock);

		kfree_skb(*skb);

		kfree_skb(skb);

		return 1;

	}



	afinfo = nf_get_afinfo(pf);

	if (!afinfo) {

		read_unlock(&queue_handler_lock);

		kfree_skb(*skb);

		kfree_skb(skb);

		return 1;

	}
@@ -109,9 +109,9 @@ int nf_queue(struct sk_buff **skb, 
	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;

	}
@@ -130,15 +130,15 @@ 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

	afinfo->saveroute(*skb, info);

	status = queue_handler[pf]->outfn(*skb, info, queuenum,

	afinfo->saveroute(skb, info);

	status = queue_handler[pf]->outfn(skb, info, queuenum,

					  queue_handler[pf]->data);



	read_unlock(&queue_handler_lock);
@@ -153,7 +153,7 @@ int nf_queue(struct sk_buff **skb, 
#endif

		module_put(info->elem->owner);

		kfree(info);

		kfree_skb(*skb);

		kfree_skb(skb);



		return 1;

	}
@@ -161,6 +161,46 @@ int nf_queue(struct sk_buff **skb, 
	return 1;

}



int nf_queue(struct sk_buff *skb,

	     struct list_head *elem,

	     int pf, unsigned int hook,

	     struct net_device *indev,

	     struct net_device *outdev,

	     int (*okfn)(struct sk_buff *),

	     unsigned int queuenum)

{

	struct sk_buff *segs;



	if (!skb_is_gso(skb))

		return __nf_queue(skb, elem, pf, hook, indev, outdev, okfn,

				  queuenum);



	switch (pf) {

	case AF_INET:

		skb->protocol = htons(ETH_P_IP);

		break;

	case AF_INET6:

		skb->protocol = htons(ETH_P_IPV6);

		break;

	}



	segs = skb_gso_segment(skb, 0);

	kfree_skb(skb);

	if (unlikely(IS_ERR(segs)))

		return 1;



	do {

		struct sk_buff *nskb = segs->next;



		segs->next = NULL;

		if (!__nf_queue(segs, elem, pf, hook, indev, outdev, okfn,

				queuenum))

			kfree_skb(segs);

		segs = nskb;

	} while (segs);

	return 1;

}



void nf_reinject(struct sk_buff *skb, struct nf_info *info,

		 unsigned int verdict)

{
@@ -224,7 +264,7 @@ void nf_reinject(struct sk_buff *skb, struct nf_info *info, 
	case NF_STOLEN:

		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,

				verdict >> NF_VERDICT_BITS))

			goto next_hook;