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#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_assign_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_assign_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;
}
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;
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;
}
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))
return -EINVAL;
queued = 0;
err = 0;
do {
struct sk_buff *nskb = segs->next;
segs->next = NULL;
if (err == 0)
err = __nf_queue(segs, elem, pf, hook, indev,
outdev, okfn, queuenum);
if (err == 0)
queued++;
else
kfree_skb(segs);
segs = nskb;
} while (segs);
/* also free orig skb if only some segments were queued */
if (unlikely(err && queued))
err = 0;
if (err == 0)
kfree_skb(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, entr
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