netfilter: add and use nf_hook_slow_list()

At this time, NF_HOOK_LIST() macro will iterate the list and then calls
nf_hook() for each individual skb.

This makes it so the entire list is passed into the netfilter core.
The advantage is that we only need to fetch the rule blob once per list
instead of per-skb.

NF_HOOK_LIST now only works for ipv4 and ipv6, as those are the only
callers.

v2: use skb_list_del_init() instead of list_del (Edward Cree)

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 5d5bdf450091..78f046ec506f 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -536,6 +536,26 @@ int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
 }
 EXPORT_SYMBOL(nf_hook_slow);
 
+void nf_hook_slow_list(struct list_head *head, struct nf_hook_state *state,
+		       const struct nf_hook_entries *e)
+{
+	struct sk_buff *skb, *next;
+	struct list_head sublist;
+	int ret;
+
+	INIT_LIST_HEAD(&sublist);
+
+	list_for_each_entry_safe(skb, next, head, list) {
+		skb_list_del_init(skb);
+		ret = nf_hook_slow(skb, state, e, 0);
+		if (ret == 1)
+			list_add_tail(&skb->list, &sublist);
+	}
+	/* Put passed packets back on main list */
+	list_splice(&sublist, head);
+}
+EXPORT_SYMBOL(nf_hook_slow_list);
+
 /* This needs to be compiled in any case to avoid dependencies between the
  * nfnetlink_queue code and nf_conntrack.
  */