netfilter: merge nf_iterate() into nf_hook_slow()

nf_iterate() has become rather simple, we can integrate this code into
nf_hook_slow() to reduce the amount of LOC in the core path.

However, we still need nf_iterate() around for nf_queue packet handling,
so move this function there where we only need it. I think it should be
possible to refactor nf_queue code to get rid of it definitely, but
given this is slow path anyway, let's have a look this later.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index ebece48..bd9272e 100644 (file)
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -302,26 +302,6 @@ void _nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n)
 }
 EXPORT_SYMBOL(_nf_unregister_hooks);
 
-unsigned int nf_iterate(struct sk_buff *skb,
-                       struct nf_hook_state *state,
-                       struct nf_hook_entry **entryp)
-{
-       unsigned int verdict;
-
-       do {
-repeat:
-               verdict = (*entryp)->ops.hook((*entryp)->ops.priv, skb, state);
-               if (verdict != NF_ACCEPT) {
-                       if (verdict != NF_REPEAT)
-                               return verdict;
-                       goto repeat;
-               }
-               *entryp = rcu_dereference((*entryp)->next);
-       } while (*entryp);
-       return NF_ACCEPT;
-}
-
-
 /* Returns 1 if okfn() needs to be executed by the caller,
  * -EPERM for NF_DROP, 0 otherwise.  Caller must hold rcu_read_lock. */
 int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
@@ -330,31 +310,34 @@ int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
        unsigned int verdict;
        int ret;
 
-next_hook:
-       verdict = nf_iterate(skb, state, &entry);
-       switch (verdict & NF_VERDICT_MASK) {
-       case NF_ACCEPT:
-               ret = 1;
-               break;
-       case NF_DROP:
-               kfree_skb(skb);
-               ret = NF_DROP_GETERR(verdict);
-               if (ret == 0)
-                       ret = -EPERM;
-               break;
-       case NF_QUEUE:
-               ret = nf_queue(skb, state, &entry, verdict);
-               if (ret == 1 && entry)
-                       goto next_hook;
-               /* Fall through. */
-       default:
-               /* Implicit handling for NF_STOLEN, as well as any other non
-                * conventional verdicts.
-                */
-               ret = 0;
-               break;
-       }
-       return ret;
+       do {
+               verdict = entry->ops.hook(entry->ops.priv, skb, state);
+               switch (verdict & NF_VERDICT_MASK) {
+               case NF_ACCEPT:
+                       entry = rcu_dereference(entry->next);
+                       break;
+               case NF_DROP:
+                       kfree_skb(skb);
+                       ret = NF_DROP_GETERR(verdict);
+                       if (ret == 0)
+                               ret = -EPERM;
+                       return ret;
+               case NF_REPEAT:
+                       continue;
+               case NF_QUEUE:
+                       ret = nf_queue(skb, state, &entry, verdict);
+                       if (ret == 1 && entry)
+                               continue;
+                       return ret;
+               default:
+                       /* Implicit handling for NF_STOLEN, as well as any other
+                        * non conventional verdicts.
+                        */
+                       return 0;
+               }
+       } while (entry);
+
+       return 1;
 }
 EXPORT_SYMBOL(nf_hook_slow);
 

diff --git a/net/netfilter/nf_internals.h b/net/netfilter/nf_internals.h
index 9fdb655..c46d214 100644 (file)
--- a/net/netfilter/nf_internals.h
+++ b/net/netfilter/nf_internals.h
@@ -11,11 +11,6 @@
 #define NFDEBUG(format, args...)
 #endif
 
-
-/* core.c */
-unsigned int nf_iterate(struct sk_buff *skb, struct nf_hook_state *state,
-                       struct nf_hook_entry **entryp);
-
 /* nf_queue.c */
 int nf_queue(struct sk_buff *skb, struct nf_hook_state *state,
             struct nf_hook_entry **entryp, unsigned int verdict);

diff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c
index 2e39e38..77cba9f 100644 (file)
--- a/net/netfilter/nf_queue.c
+++ b/net/netfilter/nf_queue.c
@@ -177,6 +177,26 @@ int nf_queue(struct sk_buff *skb, struct nf_hook_state *state,
        return 0;
 }
 
+static unsigned int nf_iterate(struct sk_buff *skb,
+                              struct nf_hook_state *state,
+                              struct nf_hook_entry **entryp)
+{
+       unsigned int verdict;
+
+       do {
+repeat:
+               verdict = (*entryp)->ops.hook((*entryp)->ops.priv, skb, state);
+               if (verdict != NF_ACCEPT) {
+                       if (verdict != NF_REPEAT)
+                               return verdict;
+                       goto repeat;
+               }
+               *entryp = rcu_dereference((*entryp)->next);
+       } while (*entryp);
+
+       return NF_ACCEPT;
+}
+
 void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
 {
        struct nf_hook_entry *hook_entry = entry->hook;