[linux.git] / net / netfilter / nf_queue.c

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
#include <linux/seq_file.h>
#include <linux/rcupdate.h>
#include <net/protocol.h>
#include <net/netfilter/nf_queue.h>
#include <net/dst.h>

#include "nf_internals.h"

/*
 * A queue handler may be registered for each protocol.  Each is protected by
 * long term mutex.  The handler must provide an an outfn() to accept packets
 * for queueing and must reinject all packets it receives, no matter what.
 */
static const struct nf_queue_handler __rcu *queue_handler[NFPROTO_NUMPROTO] __read_mostly;

static DEFINE_MUTEX(queue_handler_mutex);

/* return EBUSY when somebody else is registered, return EEXIST if the
 * same handler is registered, return 0 in case of success. */
int nf_register_queue_handler(u_int8_t pf, const struct nf_queue_handler *qh)
{
	int ret;
	const struct nf_queue_handler *old;

	if (pf >= ARRAY_SIZE(queue_handler))
		return -EINVAL;

	mutex_lock(&queue_handler_mutex);
	old = rcu_dereference_protected(queue_handler[pf],
					lockdep_is_held(&queue_handler_mutex));
	if (old == qh)
		ret = -EEXIST;
	else if (old)
		ret = -EBUSY;
	else {
		rcu_assign_pointer(queue_handler[pf], qh);
		ret = 0;
	}
	mutex_unlock(&queue_handler_mutex);

	return ret;
}
EXPORT_SYMBOL(nf_register_queue_handler);

/* The caller must flush their queue before this */
int nf_unregister_queue_handler(u_int8_t pf, const struct nf_queue_handler *qh)
{
	const struct nf_queue_handler *old;

	if (pf >= ARRAY_SIZE(queue_handler))
		return -EINVAL;

	mutex_lock(&queue_handler_mutex);
	old = rcu_dereference_protected(queue_handler[pf],
					lockdep_is_held(&queue_handler_mutex));
	if (old && old != qh) {
		mutex_unlock(&queue_handler_mutex);
		return -EINVAL;
	}

	RCU_INIT_POINTER(queue_handler[pf], NULL);
	mutex_unlock(&queue_handler_mutex);

	synchronize_rcu();

	return 0;
}
EXPORT_SYMBOL(nf_unregister_queue_handler);

void nf_unregister_queue_handlers(const struct nf_queue_handler *qh)
{
	u_int8_t pf;

	mutex_lock(&queue_handler_mutex);
	for (pf = 0; pf < ARRAY_SIZE(queue_handler); pf++)  {
		if (rcu_dereference_protected(
				queue_handler[pf],
				lockdep_is_held(&queue_handler_mutex)
				) == qh)
			RCU_INIT_POINTER(queue_handler[pf], NULL);
	}
	mutex_unlock(&queue_handler_mutex);

	synchronize_rcu();
}
EXPORT_SYMBOL_GPL(nf_unregister_queue_handlers);

static void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
{
	/* Release those devices we held, or Alexey will kill me. */
	if (entry->indev)
		dev_put(entry->indev);
	if (entry->outdev)
		dev_put(entry->outdev);
#ifdef CONFIG_BRIDGE_NETFILTER
	if (entry->skb->nf_bridge) {
		struct nf_bridge_info *nf_bridge = entry->skb->nf_bridge;

		if (nf_bridge->physindev)
			dev_put(nf_bridge->physindev);
		if (nf_bridge->physoutdev)
			dev_put(nf_bridge->physoutdev);
	}
#endif
	/* Drop reference to owner of hook which queued us. */
	module_put(entry->elem->owner);
}

/*
 * Any packet that leaves via this function must come back
 * through nf_reinject().
 */
static int __nf_queue(struct sk_buff *skb,
		      struct list_head *elem,
		      u_int8_t pf, unsigned int hook,
		      struct net_device *indev,
		      struct net_device *outdev,
		      int (*okfn)(struct sk_buff *),
		      unsigned int queuenum)
{
	int status = -ENOENT;
	struct nf_queue_entry *entry = NULL;
#ifdef CONFIG_BRIDGE_NETFILTER
	struct net_device *physindev;
	struct net_device *physoutdev;
#endif
	const struct nf_afinfo *afinfo;
	const struct nf_queue_handler *qh;

	/* QUEUE == DROP if no one is waiting, to be safe. */
	rcu_read_lock();

	qh = rcu_dereference(queue_handler[pf]);
	if (!qh) {
		status = -ESRCH;
		goto err_unlock;
	}

	afinfo = nf_get_afinfo(pf);
	if (!afinfo)
		goto err_unlock;

	entry = kmalloc(sizeof(*entry) + afinfo->route_key_size, GFP_ATOMIC);
	if (!entry) {
		status = -ENOMEM;
		goto err_unlock;
	}

	*entry = (struct nf_queue_entry) {
		.skb	= skb,
		.elem	= list_entry(elem, struct nf_hook_ops, list),
		.pf	= pf,
		.hook	= hook,
		.indev	= indev,
		.outdev	= outdev,
		.okfn	= okfn,
	};

	/* If it's going away, ignore hook. */
	if (!try_module_get(entry->elem->owner)) {
		status = -ECANCELED;
		goto err_unlock;
	}
	/* Bump dev refs so they don't vanish while packet is out */
	if (indev)
		dev_hold(indev);
	if (outdev)
		dev_hold(outdev);
#ifdef CONFIG_BRIDGE_NETFILTER
	if (skb->nf_bridge) {
		physindev = skb->nf_bridge->physindev;
		if (physindev)
			dev_hold(physindev);
		physoutdev = skb->nf_bridge->physoutdev;
		if (physoutdev)
			dev_hold(physoutdev);
	}
#endif
	skb_dst_force(skb);
	afinfo->saveroute(skb, entry);
	status = qh->outfn(entry, queuenum);

	rcu_read_unlock();

	if (status < 0) {
		nf_queue_entry_release_refs(entry);
		goto err;
	}

	return 0;

err_unlock:
	rcu_read_unlock();
err:
	kfree(entry);
	return status;
}

#ifdef CONFIG_BRIDGE_NETFILTER
/* When called from bridge netfilter, skb->data must point to MAC header
 * before calling skb_gso_segment(). Else, original MAC header is lost
 * and segmented skbs will be sent to wrong destination.
 */
static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
{
	if (skb->nf_bridge)
		__skb_push(skb, skb->network_header - skb->mac_header);
}

static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
{
	if (skb->nf_bridge)
		__skb_pull(skb, skb->network_header - skb->mac_header);
}
#else
#define nf_bridge_adjust_skb_data(s) do {} while (0)
#define nf_bridge_adjust_segmented_data(s) do {} while (0)
#endif

int nf_queue(struct sk_buff *skb,
	     struct list_head *elem,
	     u_int8_t pf, unsigned int hook,
	     struct net_device *indev,
	     struct net_device *outdev,
	     int (*okfn)(struct sk_buff *),
	     unsigned int queuenum)
{
	struct sk_buff *segs;
	int err = -EINVAL;
	unsigned int queued;

	if (!skb_is_gso(skb))
		return __nf_queue(skb, elem, pf, hook, indev, outdev, okfn,
				  queuenum);

	switch (pf) {
	case NFPROTO_IPV4:
		skb->protocol = htons(ETH_P_IP);
		break;
	case NFPROTO_IPV6:
		skb->protocol = htons(ETH_P_IPV6);
		break;
	}

	nf_bridge_adjust_skb_data(skb);
	segs = skb_gso_segment(skb, 0);
	/* Does not use PTR_ERR to limit the number of error codes that can be
	 * returned by nf_queue.  For instance, callers rely on -ECANCELED to mean
	 * 'ignore this hook'.
	 */
	if (IS_ERR(segs))
		goto out_err;
	queued = 0;
	err = 0;
	do {
		struct sk_buff *nskb = segs->next;

		segs->next = NULL;
		if (err == 0) {
			nf_bridge_adjust_segmented_data(segs);
			err = __nf_queue(segs, elem, pf, hook, indev,
					   outdev, okfn, queuenum);
		}
		if (err == 0)
			queued++;
		else
			kfree_skb(segs);
		segs = nskb;
	} while (segs);

	if (queued) {
		kfree_skb(skb);
		return 0;
	}
  out_err:
	nf_bridge_adjust_segmented_data(skb);
	return err;
}

void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
{
	struct sk_buff *skb = entry->skb;
	struct list_head *elem = &entry->elem->list;
	const struct nf_afinfo *afinfo;
	int err;

	rcu_read_lock();

	nf_queue_entry_release_refs(entry);

	/* Continue traversal iff userspace said ok... */
	if (verdict == NF_REPEAT) {
		elem = elem->prev;
		verdict = NF_ACCEPT;
	}

	if (verdict == NF_ACCEPT) {
		afinfo = nf_get_afinfo(entry->pf);
		if (!afinfo || afinfo->reroute(skb, entry) < 0)
			verdict = NF_DROP;
	}

	if (verdict == NF_ACCEPT) {
	next_hook:
		verdict = nf_iterate(&nf_hooks[entry->pf][entry->hook],
				     skb, entry->hook,
				     entry->indev, entry->outdev, &elem,
				     entry->okfn, INT_MIN);
	}

	switch (verdict & NF_VERDICT_MASK) {
	case NF_ACCEPT:
	case NF_STOP:
		local_bh_disable();
		entry->okfn(skb);
		local_bh_enable();
		break;
	case NF_QUEUE:
		err = __nf_queue(skb, elem, entry->pf, entry->hook,
				 entry->indev, entry->outdev, entry->okfn,
				 verdict >> NF_VERDICT_QBITS);
		if (err < 0) {
			if (err == -ECANCELED)
				goto next_hook;
			if (err == -ESRCH &&
			   (verdict & NF_VERDICT_FLAG_QUEUE_BYPASS))
				goto next_hook;
			kfree_skb(skb);
		}
		break;
	case NF_STOLEN:
		break;
	default:
		kfree_skb(skb);
	}
	rcu_read_unlock();
	kfree(entry);
}
EXPORT_SYMBOL(nf_reinject);

#ifdef CONFIG_PROC_FS
static void *seq_start(struct seq_file *seq, loff_t *pos)
{
	if (*pos >= ARRAY_SIZE(queue_handler))
		return NULL;

	return pos;
}

static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
{
	(*pos)++;

	if (*pos >= ARRAY_SIZE(queue_handler))
		return NULL;

	return pos;
}

static void seq_stop(struct seq_file *s, void *v)
{

}

static int seq_show(struct seq_file *s, void *v)
{
	int ret;
	loff_t *pos = v;
	const struct nf_queue_handler *qh;

	rcu_read_lock();
	qh = rcu_dereference(queue_handler[*pos]);
	if (!qh)
		ret = seq_printf(s, "%2lld NONE\n", *pos);
	else
		ret = seq_printf(s, "%2lld %s\n", *pos, qh->name);
	rcu_read_unlock();

	return ret;
}

static const struct seq_operations nfqueue_seq_ops = {
	.start	= seq_start,
	.next	= seq_next,
	.stop	= seq_stop,
	.show	= seq_show,
};

static int nfqueue_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &nfqueue_seq_ops);
}

static const struct file_operations nfqueue_file_ops = {
	.owner	 = THIS_MODULE,
	.open	 = nfqueue_open,
	.read	 = seq_read,
	.llseek	 = seq_lseek,
	.release = seq_release,
};
#endif /* PROC_FS */


int __init netfilter_queue_init(void)
{
#ifdef CONFIG_PROC_FS
	if (!proc_create("nf_queue", S_IRUGO,
			 proc_net_netfilter, &nfqueue_file_ops))
		return -1;
#endif
	return 0;
}
Commit	Line	Data
f6ebe77f	1	#include <linux/kernel.h>
5a0e3ad6	2	#include <linux/slab.h>
f6ebe77f HW	3	#include <linux/init.h>
	4	#include <linux/module.h>
	5	#include <linux/proc_fs.h>
	6	#include <linux/skbuff.h>
	7	#include <linux/netfilter.h>
bbd86b9f	8	#include <linux/seq_file.h>
7a11b984	9	#include <linux/rcupdate.h>
f6ebe77f	10	#include <net/protocol.h>
c01cd429	11	#include <net/netfilter/nf_queue.h>
7fee226a	12	#include <net/dst.h>
f6ebe77f HW	13
	14	#include "nf_internals.h"
	15
601e68e1	16	/*
f6ebe77f HW	17	* A queue handler may be registered for each protocol. Each is protected by
	18	* long term mutex. The handler must provide an an outfn() to accept packets
	19	* for queueing and must reinject all packets it receives, no matter what.
	20	*/
0906a372	21	static const struct nf_queue_handler __rcu *queue_handler[NFPROTO_NUMPROTO] __read_mostly;
f6ebe77f	22
585426fd	23	static DEFINE_MUTEX(queue_handler_mutex);
f6ebe77f	24
d72367b6 HW	25	/* return EBUSY when somebody else is registered, return EEXIST if the
d72367b6 HW	26	* same handler is registered, return 0 in case of success. */
76108cea	27	int nf_register_queue_handler(u_int8_t pf, const struct nf_queue_handler *qh)
601e68e1	28	{
f6ebe77f	29	int ret;
0e60ebe0	30	const struct nf_queue_handler *old;
f6ebe77f	31
7e9c6eeb	32	if (pf >= ARRAY_SIZE(queue_handler))
f6ebe77f HW	33	return -EINVAL;
f6ebe77f HW	34
585426fd	35	mutex_lock(&queue_handler_mutex);
0e60ebe0 ED	36	old = rcu_dereference_protected(queue_handler[pf],
	37	lockdep_is_held(&queue_handler_mutex));
	38	if (old == qh)
d72367b6	39	ret = -EEXIST;
0e60ebe0	40	else if (old)
f6ebe77f HW	41	ret = -EBUSY;
f6ebe77f HW	42	else {
cf778b00	43	rcu_assign_pointer(queue_handler[pf], qh);
f6ebe77f HW	44	ret = 0;
f6ebe77f HW	45	}
585426fd	46	mutex_unlock(&queue_handler_mutex);
f6ebe77f HW	47
	48	return ret;
	49	}
	50	EXPORT_SYMBOL(nf_register_queue_handler);
	51
	52	/* The caller must flush their queue before this */
76108cea	53	int nf_unregister_queue_handler(u_int8_t pf, const struct nf_queue_handler *qh)
f6ebe77f	54	{
0e60ebe0 ED	55	const struct nf_queue_handler *old;
0e60ebe0 ED	56
7e9c6eeb	57	if (pf >= ARRAY_SIZE(queue_handler))
f6ebe77f HW	58	return -EINVAL;
f6ebe77f HW	59
585426fd	60	mutex_lock(&queue_handler_mutex);
0e60ebe0 ED	61	old = rcu_dereference_protected(queue_handler[pf],
	62	lockdep_is_held(&queue_handler_mutex));
	63	if (old && old != qh) {
585426fd	64	mutex_unlock(&queue_handler_mutex);
ce7663d8 YK	65	return -EINVAL;
	66	}
	67
a9b3cd7f	68	RCU_INIT_POINTER(queue_handler[pf], NULL);
585426fd YK	69	mutex_unlock(&queue_handler_mutex);
	70
	71	synchronize_rcu();
601e68e1	72
f6ebe77f HW	73	return 0;
	74	}
	75	EXPORT_SYMBOL(nf_unregister_queue_handler);
	76
e3ac5298	77	void nf_unregister_queue_handlers(const struct nf_queue_handler *qh)
f6ebe77f	78	{
76108cea	79	u_int8_t pf;
f6ebe77f	80
585426fd	81	mutex_lock(&queue_handler_mutex);
7e9c6eeb	82	for (pf = 0; pf < ARRAY_SIZE(queue_handler); pf++) {
0e60ebe0 ED	83	if (rcu_dereference_protected(
	84	queue_handler[pf],
	85	lockdep_is_held(&queue_handler_mutex)
	86	) == qh)
a9b3cd7f	87	RCU_INIT_POINTER(queue_handler[pf], NULL);
f6ebe77f	88	}
585426fd YK	89	mutex_unlock(&queue_handler_mutex);
	90
	91	synchronize_rcu();
f6ebe77f HW	92	}
	93	EXPORT_SYMBOL_GPL(nf_unregister_queue_handlers);
	94
daaa8be2 PM	95	static void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
	96	{
	97	/* Release those devices we held, or Alexey will kill me. */
	98	if (entry->indev)
	99	dev_put(entry->indev);
	100	if (entry->outdev)
	101	dev_put(entry->outdev);
	102	#ifdef CONFIG_BRIDGE_NETFILTER
	103	if (entry->skb->nf_bridge) {
	104	struct nf_bridge_info *nf_bridge = entry->skb->nf_bridge;
	105
	106	if (nf_bridge->physindev)
	107	dev_put(nf_bridge->physindev);
	108	if (nf_bridge->physoutdev)
	109	dev_put(nf_bridge->physoutdev);
	110	}
	111	#endif
	112	/* Drop reference to owner of hook which queued us. */
	113	module_put(entry->elem->owner);
	114	}
	115
601e68e1 YH	116	/*
601e68e1 YH	117	* Any packet that leaves via this function must come back
f6ebe77f HW	118	* through nf_reinject().
f6ebe77f HW	119	*/
394f545d PM	120	static int __nf_queue(struct sk_buff *skb,
394f545d PM	121	struct list_head *elem,
76108cea	122	u_int8_t pf, unsigned int hook,
394f545d PM	123	struct net_device *indev,
	124	struct net_device *outdev,
	125	int (okfn)(struct sk_buff ),
	126	unsigned int queuenum)
f6ebe77f	127	{
f1585086	128	int status = -ENOENT;
daaa8be2	129	struct nf_queue_entry *entry = NULL;
f6ebe77f	130	#ifdef CONFIG_BRIDGE_NETFILTER
daaa8be2 PM	131	struct net_device *physindev;
daaa8be2 PM	132	struct net_device *physoutdev;
f6ebe77f	133	#endif
1e796fda	134	const struct nf_afinfo *afinfo;
e3ac5298	135	const struct nf_queue_handler *qh;
f6ebe77f	136
25985edc	137	/* QUEUE == DROP if no one is waiting, to be safe. */
585426fd YK	138	rcu_read_lock();
	139
	140	qh = rcu_dereference(queue_handler[pf]);
94b27cc3 FW	141	if (!qh) {
94b27cc3 FW	142	status = -ESRCH;
daaa8be2	143	goto err_unlock;
94b27cc3	144	}
f6ebe77f	145
bce8032e	146	afinfo = nf_get_afinfo(pf);
daaa8be2 PM	147	if (!afinfo)
daaa8be2 PM	148	goto err_unlock;
bce8032e	149
02f014d8	150	entry = kmalloc(sizeof(*entry) + afinfo->route_key_size, GFP_ATOMIC);
f1585086 FW	151	if (!entry) {
f1585086 FW	152	status = -ENOMEM;
daaa8be2	153	goto err_unlock;
f1585086	154	}
f6ebe77f	155
02f014d8 PM	156	*entry = (struct nf_queue_entry) {
	157	.skb = skb,
	158	.elem = list_entry(elem, struct nf_hook_ops, list),
	159	.pf = pf,
	160	.hook = hook,
	161	.indev = indev,
	162	.outdev = outdev,
	163	.okfn = okfn,
	164	};
f6ebe77f HW	165
f6ebe77f HW	166	/* If it's going away, ignore hook. */
02f014d8	167	if (!try_module_get(entry->elem->owner)) {
06cdb634 FW	168	status = -ECANCELED;
06cdb634 FW	169	goto err_unlock;
f6ebe77f	170	}
f6ebe77f	171	/* Bump dev refs so they don't vanish while packet is out */
8b1cf0db PM	172	if (indev)
	173	dev_hold(indev);
	174	if (outdev)
	175	dev_hold(outdev);
f6ebe77f	176	#ifdef CONFIG_BRIDGE_NETFILTER
394f545d PM	177	if (skb->nf_bridge) {
394f545d PM	178	physindev = skb->nf_bridge->physindev;
8b1cf0db PM	179	if (physindev)
8b1cf0db PM	180	dev_hold(physindev);
394f545d	181	physoutdev = skb->nf_bridge->physoutdev;
8b1cf0db PM	182	if (physoutdev)
8b1cf0db PM	183	dev_hold(physoutdev);
f6ebe77f HW	184	}
f6ebe77f HW	185	#endif
7fee226a	186	skb_dst_force(skb);
02f014d8 PM	187	afinfo->saveroute(skb, entry);
02f014d8 PM	188	status = qh->outfn(entry, queuenum);
f6ebe77f	189
585426fd	190	rcu_read_unlock();
f6ebe77f HW	191
f6ebe77f HW	192	if (status < 0) {
daaa8be2 PM	193	nf_queue_entry_release_refs(entry);
daaa8be2 PM	194	goto err;
f6ebe77f HW	195	}
f6ebe77f HW	196
f1585086	197	return 0;
daaa8be2 PM	198
	199	err_unlock:
	200	rcu_read_unlock();
	201	err:
daaa8be2	202	kfree(entry);
f1585086	203	return status;
f6ebe77f HW	204	}
f6ebe77f HW	205
a8db7b2d FW	206	#ifdef CONFIG_BRIDGE_NETFILTER
	207	/* When called from bridge netfilter, skb->data must point to MAC header
	208	* before calling skb_gso_segment(). Else, original MAC header is lost
	209	* and segmented skbs will be sent to wrong destination.
	210	*/
	211	static void nf_bridge_adjust_skb_data(struct sk_buff *skb)
	212	{
	213	if (skb->nf_bridge)
	214	__skb_push(skb, skb->network_header - skb->mac_header);
	215	}
	216
	217	static void nf_bridge_adjust_segmented_data(struct sk_buff *skb)
	218	{
	219	if (skb->nf_bridge)
	220	__skb_pull(skb, skb->network_header - skb->mac_header);
	221	}
	222	#else
	223	#define nf_bridge_adjust_skb_data(s) do {} while (0)
	224	#define nf_bridge_adjust_segmented_data(s) do {} while (0)
	225	#endif
	226
394f545d PM	227	int nf_queue(struct sk_buff *skb,
394f545d PM	228	struct list_head *elem,
76108cea	229	u_int8_t pf, unsigned int hook,
394f545d PM	230	struct net_device *indev,
	231	struct net_device *outdev,
	232	int (okfn)(struct sk_buff ),
	233	unsigned int queuenum)
	234	{
	235	struct sk_buff *segs;
a8db7b2d	236	int err = -EINVAL;
f1585086	237	unsigned int queued;
394f545d PM	238
	239	if (!skb_is_gso(skb))
	240	return __nf_queue(skb, elem, pf, hook, indev, outdev, okfn,
	241	queuenum);
	242
	243	switch (pf) {
4b1e27e9	244	case NFPROTO_IPV4:
394f545d PM	245	skb->protocol = htons(ETH_P_IP);
394f545d PM	246	break;
4b1e27e9	247	case NFPROTO_IPV6:
394f545d PM	248	skb->protocol = htons(ETH_P_IPV6);
	249	break;
	250	}
	251
a8db7b2d	252	nf_bridge_adjust_skb_data(skb);
394f545d	253	segs = skb_gso_segment(skb, 0);
f1585086 FW	254	/* Does not use PTR_ERR to limit the number of error codes that can be
	255	* returned by nf_queue. For instance, callers rely on -ECANCELED to mean
	256	* 'ignore this hook'.
	257	*/
801678c5	258	if (IS_ERR(segs))
a8db7b2d	259	goto out_err;
f1585086 FW	260	queued = 0;
f1585086 FW	261	err = 0;
394f545d PM	262	do {
	263	struct sk_buff *nskb = segs->next;
	264
	265	segs->next = NULL;
a8db7b2d FW	266	if (err == 0) {
a8db7b2d FW	267	nf_bridge_adjust_segmented_data(segs);
f1585086 FW	268	err = __nf_queue(segs, elem, pf, hook, indev,
f1585086 FW	269	outdev, okfn, queuenum);
a8db7b2d	270	}
f1585086 FW	271	if (err == 0)
	272	queued++;
	273	else
394f545d PM	274	kfree_skb(segs);
	275	segs = nskb;
	276	} while (segs);
f1585086	277
a8db7b2d	278	if (queued) {
06cdb634	279	kfree_skb(skb);
a8db7b2d FW	280	return 0;
	281	}
	282	out_err:
	283	nf_bridge_adjust_segmented_data(skb);
f1585086	284	return err;
394f545d PM	285	}
394f545d PM	286
02f014d8	287	void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
f6ebe77f	288	{
02f014d8 PM	289	struct sk_buff *skb = entry->skb;
02f014d8 PM	290	struct list_head *elem = &entry->elem->list;
1e796fda	291	const struct nf_afinfo *afinfo;
f1585086	292	int err;
f6ebe77f HW	293
	294	rcu_read_lock();
	295
daaa8be2	296	nf_queue_entry_release_refs(entry);
f6ebe77f	297
f6ebe77f HW	298	/* Continue traversal iff userspace said ok... */
	299	if (verdict == NF_REPEAT) {
	300	elem = elem->prev;
	301	verdict = NF_ACCEPT;
	302	}
	303
7a11b984	304	if (verdict == NF_ACCEPT) {
02f014d8 PM	305	afinfo = nf_get_afinfo(entry->pf);
02f014d8 PM	306	if (!afinfo \|\| afinfo->reroute(skb, entry) < 0)
7a11b984 PM	307	verdict = NF_DROP;
	308	}
	309
f6ebe77f HW	310	if (verdict == NF_ACCEPT) {
f6ebe77f HW	311	next_hook:
02f014d8 PM	312	verdict = nf_iterate(&nf_hooks[entry->pf][entry->hook],
	313	skb, entry->hook,
	314	entry->indev, entry->outdev, &elem,
	315	entry->okfn, INT_MIN);
f6ebe77f HW	316	}
	317
	318	switch (verdict & NF_VERDICT_MASK) {
	319	case NF_ACCEPT:
3bc38712	320	case NF_STOP:
4b3d15ef	321	local_bh_disable();
02f014d8	322	entry->okfn(skb);
4b3d15ef	323	local_bh_enable();
f6ebe77f	324	break;
f6ebe77f	325	case NF_QUEUE:
f1585086 FW	326	err = __nf_queue(skb, elem, entry->pf, entry->hook,
f1585086 FW	327	entry->indev, entry->outdev, entry->okfn,
f615df76	328	verdict >> NF_VERDICT_QBITS);
06cdb634 FW	329	if (err < 0) {
	330	if (err == -ECANCELED)
	331	goto next_hook;
94b27cc3 FW	332	if (err == -ESRCH &&
	333	(verdict & NF_VERDICT_FLAG_QUEUE_BYPASS))
	334	goto next_hook;
06cdb634 FW	335	kfree_skb(skb);
06cdb634 FW	336	}
f6ebe77f	337	break;
64507fdb	338	case NF_STOLEN:
fad54440	339	break;
3bc38712 PM	340	default:
3bc38712 PM	341	kfree_skb(skb);
f6ebe77f HW	342	}
f6ebe77f HW	343	rcu_read_unlock();
02f014d8	344	kfree(entry);
f6ebe77f HW	345	}
	346	EXPORT_SYMBOL(nf_reinject);
	347
bbd86b9f HW	348	#ifdef CONFIG_PROC_FS
	349	static void seq_start(struct seq_file seq, loff_t *pos)
	350	{
7e9c6eeb	351	if (*pos >= ARRAY_SIZE(queue_handler))
bbd86b9f HW	352	return NULL;
	353
	354	return pos;
	355	}
	356
	357	static void seq_next(struct seq_file s, void v, loff_t pos)
	358	{
	359	(*pos)++;
	360
7e9c6eeb	361	if (*pos >= ARRAY_SIZE(queue_handler))
bbd86b9f HW	362	return NULL;
	363
	364	return pos;
	365	}
	366
	367	static void seq_stop(struct seq_file s, void v)
	368	{
	369
	370	}
	371
	372	static int seq_show(struct seq_file s, void v)
	373	{
	374	int ret;
	375	loff_t *pos = v;
e3ac5298	376	const struct nf_queue_handler *qh;
bbd86b9f	377
585426fd YK	378	rcu_read_lock();
585426fd YK	379	qh = rcu_dereference(queue_handler[*pos]);
bbd86b9f HW	380	if (!qh)
	381	ret = seq_printf(s, "%2lld NONE\n", *pos);
	382	else
	383	ret = seq_printf(s, "%2lld %s\n", *pos, qh->name);
585426fd	384	rcu_read_unlock();
bbd86b9f HW	385
	386	return ret;
	387	}
	388
56b3d975	389	static const struct seq_operations nfqueue_seq_ops = {
bbd86b9f HW	390	.start = seq_start,
	391	.next = seq_next,
	392	.stop = seq_stop,
	393	.show = seq_show,
	394	};
	395
	396	static int nfqueue_open(struct inode inode, struct file file)
	397	{
	398	return seq_open(file, &nfqueue_seq_ops);
	399	}
	400
da7071d7	401	static const struct file_operations nfqueue_file_ops = {
bbd86b9f HW	402	.owner = THIS_MODULE,
	403	.open = nfqueue_open,
	404	.read = seq_read,
	405	.llseek = seq_lseek,
	406	.release = seq_release,
	407	};
	408	#endif /* PROC_FS */
	409
	410
f6ebe77f HW	411	int __init netfilter_queue_init(void)
f6ebe77f HW	412	{
bbd86b9f	413	#ifdef CONFIG_PROC_FS
8eeee8b1 DL	414	if (!proc_create("nf_queue", S_IRUGO,
8eeee8b1 DL	415	proc_net_netfilter, &nfqueue_file_ops))
bbd86b9f	416	return -1;
bbd86b9f	417	#endif
f6ebe77f HW	418	return 0;
	419	}
	420