#include <linux/seq_file.h>
#include <linux/rcupdate.h>
#include <net/protocol.h>
+#include <net/netfilter/nf_queue.h>
#include "nf_internals.h"
* 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 struct nf_queue_handler *queue_handler[NPROTO];
+static const struct nf_queue_handler *queue_handler[NPROTO];
-static DEFINE_RWLOCK(queue_handler_lock);
+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(int pf, struct nf_queue_handler *qh)
+int nf_register_queue_handler(int pf, const struct nf_queue_handler *qh)
{
int ret;
if (pf >= NPROTO)
return -EINVAL;
- write_lock_bh(&queue_handler_lock);
+ mutex_lock(&queue_handler_mutex);
if (queue_handler[pf] == qh)
ret = -EEXIST;
else if (queue_handler[pf])
ret = -EBUSY;
else {
- queue_handler[pf] = qh;
+ rcu_assign_pointer(queue_handler[pf], qh);
ret = 0;
}
- write_unlock_bh(&queue_handler_lock);
+ 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(int pf)
+int nf_unregister_queue_handler(int pf, const struct nf_queue_handler *qh)
{
if (pf >= NPROTO)
return -EINVAL;
- write_lock_bh(&queue_handler_lock);
- queue_handler[pf] = NULL;
- write_unlock_bh(&queue_handler_lock);
+ mutex_lock(&queue_handler_mutex);
+ if (queue_handler[pf] != 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(struct nf_queue_handler *qh)
+void nf_unregister_queue_handlers(const struct nf_queue_handler *qh)
{
int pf;
- write_lock_bh(&queue_handler_lock);
+ mutex_lock(&queue_handler_mutex);
for (pf = 0; pf < NPROTO; pf++) {
if (queue_handler[pf] == qh)
- queue_handler[pf] = NULL;
+ rcu_assign_pointer(queue_handler[pf], NULL);
}
- write_unlock_bh(&queue_handler_lock);
+ mutex_unlock(&queue_handler_mutex);
+
+ synchronize_rcu();
}
EXPORT_SYMBOL_GPL(nf_unregister_queue_handlers);
unsigned int queuenum)
{
int status;
- struct nf_info *info;
+ struct nf_queue_entry *entry;
#ifdef CONFIG_BRIDGE_NETFILTER
struct net_device *physindev = NULL;
struct net_device *physoutdev = NULL;
#endif
struct nf_afinfo *afinfo;
+ const struct nf_queue_handler *qh;
/* QUEUE == DROP if noone is waiting, to be safe. */
- read_lock(&queue_handler_lock);
- if (!queue_handler[pf]) {
- read_unlock(&queue_handler_lock);
+ rcu_read_lock();
+
+ qh = rcu_dereference(queue_handler[pf]);
+ if (!qh) {
+ rcu_read_unlock();
kfree_skb(skb);
return 1;
}
afinfo = nf_get_afinfo(pf);
if (!afinfo) {
- read_unlock(&queue_handler_lock);
+ rcu_read_unlock();
kfree_skb(skb);
return 1;
}
- info = kmalloc(sizeof(*info) + afinfo->route_key_size, GFP_ATOMIC);
- if (!info) {
+ entry = kmalloc(sizeof(*entry) + afinfo->route_key_size, GFP_ATOMIC);
+ if (!entry) {
if (net_ratelimit())
printk(KERN_ERR "OOM queueing packet %p\n",
skb);
- read_unlock(&queue_handler_lock);
+ rcu_read_unlock();
kfree_skb(skb);
return 1;
}
- *info = (struct nf_info) {
- (struct nf_hook_ops *)elem, pf, hook, indev, outdev, okfn };
+ *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(info->elem->owner)) {
- read_unlock(&queue_handler_lock);
- kfree(info);
+ if (!try_module_get(entry->elem->owner)) {
+ rcu_read_unlock();
+ kfree(entry);
return 0;
}
/* Bump dev refs so they don't vanish while packet is out */
- if (indev) dev_hold(indev);
- if (outdev) dev_hold(outdev);
-
+ 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);
+ if (physindev)
+ dev_hold(physindev);
physoutdev = skb->nf_bridge->physoutdev;
- if (physoutdev) dev_hold(physoutdev);
+ if (physoutdev)
+ dev_hold(physoutdev);
}
#endif
- afinfo->saveroute(skb, info);
- status = queue_handler[pf]->outfn(skb, info, queuenum,
- queue_handler[pf]->data);
+ afinfo->saveroute(skb, entry);
+ status = qh->outfn(entry, queuenum);
- read_unlock(&queue_handler_lock);
+ rcu_read_unlock();
if (status < 0) {
/* James M doesn't say fuck enough. */
- if (indev) dev_put(indev);
- if (outdev) dev_put(outdev);
+ if (indev)
+ dev_put(indev);
+ if (outdev)
+ dev_put(outdev);
#ifdef CONFIG_BRIDGE_NETFILTER
- if (physindev) dev_put(physindev);
- if (physoutdev) dev_put(physoutdev);
+ if (physindev)
+ dev_put(physindev);
+ if (physoutdev)
+ dev_put(physoutdev);
#endif
- module_put(info->elem->owner);
- kfree(info);
+ module_put(entry->elem->owner);
+ kfree(entry);
kfree_skb(skb);
return 1;
return 1;
}
-void nf_reinject(struct sk_buff *skb, struct nf_info *info,
- unsigned int verdict)
+void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
{
- struct list_head *elem = &info->elem->list;
- struct list_head *i;
+ struct sk_buff *skb = entry->skb;
+ struct list_head *elem = &entry->elem->list;
struct nf_afinfo *afinfo;
rcu_read_lock();
/* Release those devices we held, or Alexey will kill me. */
- if (info->indev) dev_put(info->indev);
- if (info->outdev) dev_put(info->outdev);
+ if (entry->indev)
+ dev_put(entry->indev);
+ if (entry->outdev)
+ dev_put(entry->outdev);
#ifdef CONFIG_BRIDGE_NETFILTER
if (skb->nf_bridge) {
if (skb->nf_bridge->physindev)
#endif
/* Drop reference to owner of hook which queued us. */
- module_put(info->elem->owner);
-
- list_for_each_rcu(i, &nf_hooks[info->pf][info->hook]) {
- if (i == elem)
- break;
- }
-
- if (i == &nf_hooks[info->pf][info->hook]) {
- /* The module which sent it to userspace is gone. */
- NFDEBUG("%s: module disappeared, dropping packet.\n",
- __FUNCTION__);
- verdict = NF_DROP;
- }
+ module_put(entry->elem->owner);
/* Continue traversal iff userspace said ok... */
if (verdict == NF_REPEAT) {
}
if (verdict == NF_ACCEPT) {
- afinfo = nf_get_afinfo(info->pf);
- if (!afinfo || afinfo->reroute(&skb, info) < 0)
+ 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[info->pf][info->hook],
- &skb, info->hook,
- info->indev, info->outdev, &elem,
- info->okfn, INT_MIN);
+ 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:
- info->okfn(skb);
+ entry->okfn(skb);
case NF_STOLEN:
break;
case NF_QUEUE:
- if (!__nf_queue(skb, elem, info->pf, info->hook,
- info->indev, info->outdev, info->okfn,
+ if (!__nf_queue(skb, elem, entry->pf, entry->hook,
+ entry->indev, entry->outdev, entry->okfn,
verdict >> NF_VERDICT_BITS))
goto next_hook;
break;
kfree_skb(skb);
}
rcu_read_unlock();
- kfree(info);
+ kfree(entry);
return;
}
EXPORT_SYMBOL(nf_reinject);
{
int ret;
loff_t *pos = v;
- struct nf_queue_handler *qh;
+ const struct nf_queue_handler *qh;
- read_lock_bh(&queue_handler_lock);
- qh = queue_handler[*pos];
+ 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);
- read_unlock_bh(&queue_handler_lock);
+ rcu_read_unlock();
return ret;
}
-static struct seq_operations nfqueue_seq_ops = {
+static const struct seq_operations nfqueue_seq_ops = {
.start = seq_start,
.next = seq_next,
.stop = seq_stop,
projects / mirror_ubuntu-bionic-kernel.git / blobdiff