+/*
+ * Rusty Russell (C)2000 -- This code is GPL.
+ * Patrick McHardy (c) 2006-2012
+ */
+
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
}
EXPORT_SYMBOL(nf_unregister_queue_handler);
-static void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
+void nf_queue_entry_release_refs(struct nf_queue_entry *entry)
{
/* Release those devices we held, or Alexey will kill me. */
if (entry->indev)
/* Drop reference to owner of hook which queued us. */
module_put(entry->elem->owner);
}
+EXPORT_SYMBOL_GPL(nf_queue_entry_release_refs);
+
+/* Bump dev refs so they don't vanish while packet is out */
+bool nf_queue_entry_get_refs(struct nf_queue_entry *entry)
+{
+ if (!try_module_get(entry->elem->owner))
+ return false;
+
+ if (entry->indev)
+ dev_hold(entry->indev);
+ if (entry->outdev)
+ dev_hold(entry->outdev);
+#ifdef CONFIG_BRIDGE_NETFILTER
+ if (entry->skb->nf_bridge) {
+ struct nf_bridge_info *nf_bridge = entry->skb->nf_bridge;
+ struct net_device *physdev;
+
+ physdev = nf_bridge->physindev;
+ if (physdev)
+ dev_hold(physdev);
+ physdev = nf_bridge->physoutdev;
+ if (physdev)
+ dev_hold(physdev);
+ }
+#endif
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(nf_queue_entry_get_refs);
/*
* Any packet that leaves via this function must come back
* through nf_reinject().
*/
-static int __nf_queue(struct sk_buff *skb,
+int nf_queue(struct sk_buff *skb,
struct nf_hook_ops *elem,
u_int8_t pf, unsigned int hook,
struct net_device *indev,
{
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;
.indev = indev,
.outdev = outdev,
.okfn = okfn,
+ .size = sizeof(*entry) + afinfo->route_key_size,
};
- /* If it's going away, ignore hook. */
- if (!try_module_get(entry->elem->owner)) {
+ if (!nf_queue_entry_get_refs(entry)) {
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);
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 nf_hook_ops *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;
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);
+ 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;
projects / karo-tx-linux.git / blobdiff