6058fa6bb9
Heh, last minute proof-reading of this patch made me think, that this is actually unneeded, simply because "ct" pointers will be different for different conntracks in different netns, just like they are different in one netns. Not so sure anymore. [Patrick: pointers will be different, flushing can only be done while inactive though and thus it needs to be per netns] Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
129 lines
3.6 KiB
C
129 lines
3.6 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_ct_expect_chain);
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EXPORT_SYMBOL_GPL(nf_ct_expect_chain);
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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 net *net = nf_ct_net(ct);
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struct nf_conntrack_ecache *ecache;
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local_bh_disable();
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ecache = per_cpu_ptr(net->ct.ecache, raw_smp_processor_id());
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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 net *net = nf_ct_net(ct);
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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 = per_cpu_ptr(net->ct.ecache, raw_smp_processor_id());
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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(struct net *net)
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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_ptr(net->ct.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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int nf_conntrack_ecache_init(struct net *net)
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{
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net->ct.ecache = alloc_percpu(struct nf_conntrack_ecache);
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if (!net->ct.ecache)
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return -ENOMEM;
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return 0;
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}
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void nf_conntrack_ecache_fini(struct net *net)
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{
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free_percpu(net->ct.ecache);
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}
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int nf_conntrack_register_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_register(&nf_conntrack_chain, nb);
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}
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EXPORT_SYMBOL_GPL(nf_conntrack_register_notifier);
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int nf_conntrack_unregister_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_unregister(&nf_conntrack_chain, nb);
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}
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EXPORT_SYMBOL_GPL(nf_conntrack_unregister_notifier);
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int nf_ct_expect_register_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_register(&nf_ct_expect_chain, nb);
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}
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EXPORT_SYMBOL_GPL(nf_ct_expect_register_notifier);
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int nf_ct_expect_unregister_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_unregister(&nf_ct_expect_chain, nb);
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}
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EXPORT_SYMBOL_GPL(nf_ct_expect_unregister_notifier);
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