![Yasuyuki Kozakai](/assets/img/avatar_default.png)
Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/* Event cache for netfilter. */
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
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* (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/netfilter.h>
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#include <linux/skbuff.h>
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#include <linux/vmalloc.h>
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#include <linux/stddef.h>
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#include <linux/err.h>
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#include <linux/percpu.h>
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#include <linux/notifier.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_core.h>
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ATOMIC_NOTIFIER_HEAD(nf_conntrack_chain);
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EXPORT_SYMBOL_GPL(nf_conntrack_chain);
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ATOMIC_NOTIFIER_HEAD(nf_conntrack_expect_chain);
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EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
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DEFINE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
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EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
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/* deliver cached events and clear cache entry - must be called with locally
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* disabled softirqs */
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static inline void
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__nf_ct_deliver_cached_events(struct nf_conntrack_ecache *ecache)
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{
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if (nf_ct_is_confirmed(ecache->ct) && !nf_ct_is_dying(ecache->ct)
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&& ecache->events)
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atomic_notifier_call_chain(&nf_conntrack_chain, ecache->events,
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ecache->ct);
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ecache->events = 0;
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nf_ct_put(ecache->ct);
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ecache->ct = NULL;
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}
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/* Deliver all cached events for a particular conntrack. This is called
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* by code prior to async packet handling for freeing the skb */
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void nf_ct_deliver_cached_events(const struct nf_conn *ct)
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{
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struct nf_conntrack_ecache *ecache;
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local_bh_disable();
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ecache = &__get_cpu_var(nf_conntrack_ecache);
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if (ecache->ct == ct)
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__nf_ct_deliver_cached_events(ecache);
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local_bh_enable();
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}
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EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
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/* Deliver cached events for old pending events, if current conntrack != old */
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void __nf_ct_event_cache_init(struct nf_conn *ct)
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{
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struct nf_conntrack_ecache *ecache;
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/* take care of delivering potentially old events */
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ecache = &__get_cpu_var(nf_conntrack_ecache);
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BUG_ON(ecache->ct == ct);
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if (ecache->ct)
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__nf_ct_deliver_cached_events(ecache);
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/* initialize for this conntrack/packet */
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ecache->ct = ct;
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nf_conntrack_get(&ct->ct_general);
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}
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EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
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/* flush the event cache - touches other CPU's data and must not be called
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* while packets are still passing through the code */
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void nf_ct_event_cache_flush(void)
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{
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struct nf_conntrack_ecache *ecache;
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int cpu;
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for_each_possible_cpu(cpu) {
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ecache = &per_cpu(nf_conntrack_ecache, cpu);
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if (ecache->ct)
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nf_ct_put(ecache->ct);
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}
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}
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