diff options
Diffstat (limited to 'net/netfilter/nf_conntrack_ecache.c')
-rw-r--r-- | net/netfilter/nf_conntrack_ecache.c | 185 |
1 files changed, 117 insertions, 68 deletions
diff --git a/net/netfilter/nf_conntrack_ecache.c b/net/netfilter/nf_conntrack_ecache.c index 5516b3e64b4..683281b7804 100644 --- a/net/netfilter/nf_conntrack_ecache.c +++ b/net/netfilter/nf_conntrack_ecache.c @@ -21,6 +21,7 @@ #include <net/netfilter/nf_conntrack.h> #include <net/netfilter/nf_conntrack_core.h> +#include <net/netfilter/nf_conntrack_extend.h> static DEFINE_MUTEX(nf_ct_ecache_mutex); @@ -32,94 +33,38 @@ EXPORT_SYMBOL_GPL(nf_expect_event_cb); /* 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) +void nf_ct_deliver_cached_events(struct nf_conn *ct) { + unsigned long events; struct nf_ct_event_notifier *notify; + struct nf_conntrack_ecache *e; rcu_read_lock(); notify = rcu_dereference(nf_conntrack_event_cb); if (notify == NULL) goto out_unlock; - if (nf_ct_is_confirmed(ecache->ct) && !nf_ct_is_dying(ecache->ct) - && ecache->events) { + e = nf_ct_ecache_find(ct); + if (e == NULL) + goto out_unlock; + + events = xchg(&e->cache, 0); + + if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct) && events) { struct nf_ct_event item = { - .ct = ecache->ct, + .ct = ct, .pid = 0, .report = 0 }; - notify->fcn(ecache->events, &item); + notify->fcn(events, &item); } - ecache->events = 0; - nf_ct_put(ecache->ct); - ecache->ct = NULL; - out_unlock: rcu_read_unlock(); } - -/* 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 net *net = nf_ct_net(ct); - struct nf_conntrack_ecache *ecache; - - local_bh_disable(); - ecache = per_cpu_ptr(net->ct.ecache, raw_smp_processor_id()); - 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 net *net = nf_ct_net(ct); - struct nf_conntrack_ecache *ecache; - - /* take care of delivering potentially old events */ - ecache = per_cpu_ptr(net->ct.ecache, raw_smp_processor_id()); - 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(struct net *net) -{ - struct nf_conntrack_ecache *ecache; - int cpu; - - for_each_possible_cpu(cpu) { - ecache = per_cpu_ptr(net->ct.ecache, cpu); - if (ecache->ct) - nf_ct_put(ecache->ct); - } -} - -int nf_conntrack_ecache_init(struct net *net) -{ - net->ct.ecache = alloc_percpu(struct nf_conntrack_ecache); - if (!net->ct.ecache) - return -ENOMEM; - return 0; -} - -void nf_conntrack_ecache_fini(struct net *net) -{ - free_percpu(net->ct.ecache); -} - int nf_conntrack_register_notifier(struct nf_ct_event_notifier *new) { int ret = 0; @@ -185,3 +130,107 @@ void nf_ct_expect_unregister_notifier(struct nf_exp_event_notifier *new) mutex_unlock(&nf_ct_ecache_mutex); } EXPORT_SYMBOL_GPL(nf_ct_expect_unregister_notifier); + +#define NF_CT_EVENTS_DEFAULT 1 +static int nf_ct_events __read_mostly = NF_CT_EVENTS_DEFAULT; + +#ifdef CONFIG_SYSCTL +static struct ctl_table event_sysctl_table[] = { + { + .ctl_name = CTL_UNNUMBERED, + .procname = "nf_conntrack_events", + .data = &init_net.ct.sysctl_events, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + {} +}; +#endif /* CONFIG_SYSCTL */ + +static struct nf_ct_ext_type event_extend __read_mostly = { + .len = sizeof(struct nf_conntrack_ecache), + .align = __alignof__(struct nf_conntrack_ecache), + .id = NF_CT_EXT_ECACHE, +}; + +#ifdef CONFIG_SYSCTL +static int nf_conntrack_event_init_sysctl(struct net *net) +{ + struct ctl_table *table; + + table = kmemdup(event_sysctl_table, sizeof(event_sysctl_table), + GFP_KERNEL); + if (!table) + goto out; + + table[0].data = &net->ct.sysctl_events; + + net->ct.event_sysctl_header = + register_net_sysctl_table(net, + nf_net_netfilter_sysctl_path, table); + if (!net->ct.event_sysctl_header) { + printk(KERN_ERR "nf_ct_event: can't register to sysctl.\n"); + goto out_register; + } + return 0; + +out_register: + kfree(table); +out: + return -ENOMEM; +} + +static void nf_conntrack_event_fini_sysctl(struct net *net) +{ + struct ctl_table *table; + + table = net->ct.event_sysctl_header->ctl_table_arg; + unregister_net_sysctl_table(net->ct.event_sysctl_header); + kfree(table); +} +#else +static int nf_conntrack_event_init_sysctl(struct net *net) +{ + return 0; +} + +static void nf_conntrack_event_fini_sysctl(struct net *net) +{ +} +#endif /* CONFIG_SYSCTL */ + +int nf_conntrack_ecache_init(struct net *net) +{ + int ret; + + net->ct.sysctl_events = nf_ct_events; + + if (net_eq(net, &init_net)) { + ret = nf_ct_extend_register(&event_extend); + if (ret < 0) { + printk(KERN_ERR "nf_ct_event: Unable to register " + "event extension.\n"); + goto out_extend_register; + } + } + + ret = nf_conntrack_event_init_sysctl(net); + if (ret < 0) + goto out_sysctl; + + return 0; + +out_sysctl: + if (net_eq(net, &init_net)) + nf_ct_extend_unregister(&event_extend); +out_extend_register: + return ret; +} + +void nf_conntrack_ecache_fini(struct net *net) +{ + nf_conntrack_event_fini_sysctl(net); + if (net_eq(net, &init_net)) + nf_ct_extend_unregister(&event_extend); +} |