123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293 |
- /* Event cache for netfilter. */
- /* (C) 1999-2001 Paul `Rusty' Russell
- * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
- * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/types.h>
- #include <linux/netfilter.h>
- #include <linux/skbuff.h>
- #include <linux/vmalloc.h>
- #include <linux/stddef.h>
- #include <linux/err.h>
- #include <linux/percpu.h>
- #include <linux/notifier.h>
- #include <linux/kernel.h>
- #include <linux/netdevice.h>
- #include <net/netfilter/nf_conntrack.h>
- #include <net/netfilter/nf_conntrack_core.h>
- ATOMIC_NOTIFIER_HEAD(nf_conntrack_chain);
- EXPORT_SYMBOL_GPL(nf_conntrack_chain);
- ATOMIC_NOTIFIER_HEAD(nf_conntrack_expect_chain);
- EXPORT_SYMBOL_GPL(nf_conntrack_expect_chain);
- DEFINE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache);
- EXPORT_PER_CPU_SYMBOL_GPL(nf_conntrack_ecache);
- /* deliver cached events and clear cache entry - must be called with locally
- * disabled softirqs */
- static inline void
- __nf_ct_deliver_cached_events(struct nf_conntrack_ecache *ecache)
- {
- if (nf_ct_is_confirmed(ecache->ct) && !nf_ct_is_dying(ecache->ct)
- && ecache->events)
- atomic_notifier_call_chain(&nf_conntrack_chain, ecache->events,
- ecache->ct);
- ecache->events = 0;
- nf_ct_put(ecache->ct);
- ecache->ct = NULL;
- }
- /* Deliver all cached events for a particular conntrack. This is called
- * by code prior to async packet handling for freeing the skb */
- void nf_ct_deliver_cached_events(const struct nf_conn *ct)
- {
- struct nf_conntrack_ecache *ecache;
- local_bh_disable();
- ecache = &__get_cpu_var(nf_conntrack_ecache);
- if (ecache->ct == ct)
- __nf_ct_deliver_cached_events(ecache);
- local_bh_enable();
- }
- EXPORT_SYMBOL_GPL(nf_ct_deliver_cached_events);
- /* Deliver cached events for old pending events, if current conntrack != old */
- void __nf_ct_event_cache_init(struct nf_conn *ct)
- {
- struct nf_conntrack_ecache *ecache;
- /* take care of delivering potentially old events */
- ecache = &__get_cpu_var(nf_conntrack_ecache);
- BUG_ON(ecache->ct == ct);
- if (ecache->ct)
- __nf_ct_deliver_cached_events(ecache);
- /* initialize for this conntrack/packet */
- ecache->ct = ct;
- nf_conntrack_get(&ct->ct_general);
- }
- EXPORT_SYMBOL_GPL(__nf_ct_event_cache_init);
- /* flush the event cache - touches other CPU's data and must not be called
- * while packets are still passing through the code */
- void nf_ct_event_cache_flush(void)
- {
- struct nf_conntrack_ecache *ecache;
- int cpu;
- for_each_possible_cpu(cpu) {
- ecache = &per_cpu(nf_conntrack_ecache, cpu);
- if (ecache->ct)
- nf_ct_put(ecache->ct);
- }
- }
|