1 /* Event cache for netfilter. */
3 /* (C) 1999-2001 Paul `Rusty' Russell
4 * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
5 * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/types.h>
13 #include <linux/netfilter.h>
14 #include <linux/skbuff.h>
15 #include <linux/vmalloc.h>
16 #include <linux/stddef.h>
17 #include <linux/err.h>
18 #include <linux/percpu.h>
19 #include <linux/notifier.h>
20 #include <linux/kernel.h>
21 #include <linux/netdevice.h>
23 #include <net/netfilter/nf_conntrack.h>
24 #include <net/netfilter/nf_conntrack_l3proto.h>
25 #include <net/netfilter/nf_conntrack_l4proto.h>
26 #include <net/netfilter/nf_conntrack_expect.h>
27 #include <net/netfilter/nf_conntrack_helper.h>
28 #include <net/netfilter/nf_conntrack_core.h>
30 ATOMIC_NOTIFIER_HEAD(nf_conntrack_chain);
31 ATOMIC_NOTIFIER_HEAD(nf_conntrack_expect_chain);
33 DEFINE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
35 /* deliver cached events and clear cache entry - must be called with locally
36 * disabled softirqs */
38 __nf_ct_deliver_cached_events(struct nf_conntrack_ecache *ecache)
40 if (nf_ct_is_confirmed(ecache->ct) && !nf_ct_is_dying(ecache->ct)
42 atomic_notifier_call_chain(&nf_conntrack_chain, ecache->events,
46 nf_ct_put(ecache->ct);
50 /* Deliver all cached events for a particular conntrack. This is called
51 * by code prior to async packet handling for freeing the skb */
52 void nf_ct_deliver_cached_events(const struct nf_conn *ct)
54 struct nf_conntrack_ecache *ecache;
57 ecache = &__get_cpu_var(nf_conntrack_ecache);
59 __nf_ct_deliver_cached_events(ecache);
63 /* Deliver cached events for old pending events, if current conntrack != old */
64 void __nf_ct_event_cache_init(struct nf_conn *ct)
66 struct nf_conntrack_ecache *ecache;
68 /* take care of delivering potentially old events */
69 ecache = &__get_cpu_var(nf_conntrack_ecache);
70 BUG_ON(ecache->ct == ct);
72 __nf_ct_deliver_cached_events(ecache);
73 /* initialize for this conntrack/packet */
75 nf_conntrack_get(&ct->ct_general);
78 /* flush the event cache - touches other CPU's data and must not be called
79 * while packets are still passing through the code */
80 void nf_ct_event_cache_flush(void)
82 struct nf_conntrack_ecache *ecache;
85 for_each_possible_cpu(cpu) {
86 ecache = &per_cpu(nf_conntrack_ecache, cpu);
88 nf_ct_put(ecache->ct);