[deliverable/linux.git] / include / net / netfilter / nf_conntrack_ecache.h

/*
 * connection tracking event cache.
 */

#ifndef _NF_CONNTRACK_ECACHE_H
#define _NF_CONNTRACK_ECACHE_H
#include <net/netfilter/nf_conntrack.h>

#include <net/net_namespace.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/netfilter/nf_conntrack_tuple_common.h>
#include <net/netfilter/nf_conntrack_extend.h>

struct nf_conntrack_ecache {
	unsigned long cache;	/* bitops want long */
	unsigned long missed;	/* missed events */
	u16 ctmask;		/* bitmask of ct events to be delivered */
	u16 expmask;		/* bitmask of expect events to be delivered */
	u32 portid;		/* netlink portid of destroyer */
};

static inline struct nf_conntrack_ecache *
nf_ct_ecache_find(const struct nf_conn *ct)
{
#ifdef CONFIG_NF_CONNTRACK_EVENTS
	return nf_ct_ext_find(ct, NF_CT_EXT_ECACHE);
#else
	return NULL;
#endif
}

static inline struct nf_conntrack_ecache *
nf_ct_ecache_ext_add(struct nf_conn *ct, u16 ctmask, u16 expmask, gfp_t gfp)
{
#ifdef CONFIG_NF_CONNTRACK_EVENTS
	struct net *net = nf_ct_net(ct);
	struct nf_conntrack_ecache *e;

	if (!ctmask && !expmask && net->ct.sysctl_events) {
		ctmask = ~0;
		expmask = ~0;
	}
	if (!ctmask && !expmask)
		return NULL;

	e = nf_ct_ext_add(ct, NF_CT_EXT_ECACHE, gfp);
	if (e) {
		e->ctmask  = ctmask;
		e->expmask = expmask;
	}
	return e;
#else
	return NULL;
#endif
};

#ifdef CONFIG_NF_CONNTRACK_EVENTS
/* This structure is passed to event handler */
struct nf_ct_event {
	struct nf_conn *ct;
	u32 portid;
	int report;
};

struct nf_ct_event_notifier {
	int (*fcn)(unsigned int events, struct nf_ct_event *item);
};

int nf_conntrack_register_notifier(struct net *net,
				   struct nf_ct_event_notifier *nb);
void nf_conntrack_unregister_notifier(struct net *net,
				      struct nf_ct_event_notifier *nb);

void nf_ct_deliver_cached_events(struct nf_conn *ct);
int nf_conntrack_eventmask_report(unsigned int eventmask, struct nf_conn *ct,
				  u32 portid, int report);

static inline void
nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
{
	struct net *net = nf_ct_net(ct);
	struct nf_conntrack_ecache *e;

	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
		return;

	e = nf_ct_ecache_find(ct);
	if (e == NULL)
		return;

	set_bit(event, &e->cache);
}

static inline int
nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
			  u32 portid, int report)
{
	const struct net *net = nf_ct_net(ct);

	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
		return 0;

	return nf_conntrack_eventmask_report(1 << event, ct, portid, report);
}

static inline int
nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
{
	const struct net *net = nf_ct_net(ct);

	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
		return 0;

	return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
}

struct nf_exp_event {
	struct nf_conntrack_expect *exp;
	u32 portid;
	int report;
};

struct nf_exp_event_notifier {
	int (*fcn)(unsigned int events, struct nf_exp_event *item);
};

int nf_ct_expect_register_notifier(struct net *net,
				   struct nf_exp_event_notifier *nb);
void nf_ct_expect_unregister_notifier(struct net *net,
				      struct nf_exp_event_notifier *nb);

void nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
			       struct nf_conntrack_expect *exp,
			       u32 portid, int report);

int nf_conntrack_ecache_pernet_init(struct net *net);
void nf_conntrack_ecache_pernet_fini(struct net *net);

int nf_conntrack_ecache_init(void);
void nf_conntrack_ecache_fini(void);

static inline void nf_conntrack_ecache_delayed_work(struct net *net)
{
	if (!delayed_work_pending(&net->ct.ecache_dwork)) {
		schedule_delayed_work(&net->ct.ecache_dwork, HZ);
		net->ct.ecache_dwork_pending = true;
	}
}

static inline void nf_conntrack_ecache_work(struct net *net)
{
	if (net->ct.ecache_dwork_pending) {
		net->ct.ecache_dwork_pending = false;
		mod_delayed_work(system_wq, &net->ct.ecache_dwork, 0);
	}
}
#else /* CONFIG_NF_CONNTRACK_EVENTS */
static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
					    struct nf_conn *ct) {}
static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
						struct nf_conn *ct,
						u32 portid,
						int report) { return 0; }
static inline int nf_conntrack_event(enum ip_conntrack_events event,
				     struct nf_conn *ct) { return 0; }
static inline int nf_conntrack_event_report(enum ip_conntrack_events event,
					    struct nf_conn *ct,
					    u32 portid,
					    int report) { return 0; }
static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
					     struct nf_conntrack_expect *exp,
 					     u32 portid,
 					     int report) {}

static inline int nf_conntrack_ecache_pernet_init(struct net *net)
{
	return 0;
}

static inline void nf_conntrack_ecache_pernet_fini(struct net *net)
{
}

static inline int nf_conntrack_ecache_init(void)
{
	return 0;
}

static inline void nf_conntrack_ecache_fini(void)
{
}

static inline void nf_conntrack_ecache_delayed_work(struct net *net)
{
}

static inline void nf_conntrack_ecache_work(struct net *net)
{
}
#endif /* CONFIG_NF_CONNTRACK_EVENTS */

#endif /*_NF_CONNTRACK_ECACHE_H*/
Commit	Line	Data
f6180121 MJ	1	/*
	2	* connection tracking event cache.
	3	*/
	4
	5	#ifndef _NF_CONNTRACK_ECACHE_H
	6	#define _NF_CONNTRACK_ECACHE_H
	7	#include <net/netfilter/nf_conntrack.h>
	8
6058fa6b	9	#include <net/net_namespace.h>
f6180121	10	#include <net/netfilter/nf_conntrack_expect.h>
a0891aa6 PNA	11	#include <linux/netfilter/nf_conntrack_common.h>
	12	#include <linux/netfilter/nf_conntrack_tuple_common.h>
	13	#include <net/netfilter/nf_conntrack_extend.h>
f6180121	14
a0891aa6	15	struct nf_conntrack_ecache {
0cebe4b4 PM	16	unsigned long cache; /* bitops want long */
	17	unsigned long missed; /* missed events */
	18	u16 ctmask; /* bitmask of ct events to be delivered */
	19	u16 expmask; /* bitmask of expect events to be delivered */
15e47304	20	u32 portid; /* netlink portid of destroyer */
a0891aa6	21	};
6bfea198	22
a0891aa6 PNA	23	static inline struct nf_conntrack_ecache *
	24	nf_ct_ecache_find(const struct nf_conn *ct)
	25	{
e0e76c83	26	#ifdef CONFIG_NF_CONNTRACK_EVENTS
a0891aa6	27	return nf_ct_ext_find(ct, NF_CT_EXT_ECACHE);
e0e76c83 CG	28	#else
	29	return NULL;
	30	#endif
a0891aa6	31	}
6bfea198	32
a0891aa6	33	static inline struct nf_conntrack_ecache *
0cebe4b4	34	nf_ct_ecache_ext_add(struct nf_conn *ct, u16 ctmask, u16 expmask, gfp_t gfp)
a0891aa6	35	{
e0e76c83	36	#ifdef CONFIG_NF_CONNTRACK_EVENTS
a0891aa6	37	struct net *net = nf_ct_net(ct);
0cebe4b4	38	struct nf_conntrack_ecache *e;
6bfea198	39
0cebe4b4 PM	40	if (!ctmask && !expmask && net->ct.sysctl_events) {
	41	ctmask = ~0;
	42	expmask = ~0;
	43	}
	44	if (!ctmask && !expmask)
a0891aa6	45	return NULL;
6bfea198	46
0cebe4b4 PM	47	e = nf_ct_ext_add(ct, NF_CT_EXT_ECACHE, gfp);
	48	if (e) {
	49	e->ctmask = ctmask;
	50	e->expmask = expmask;
	51	}
	52	return e;
e0e76c83 CG	53	#else
	54	return NULL;
	55	#endif
6bfea198 PNA	56	};
6bfea198 PNA	57
f6180121	58	#ifdef CONFIG_NF_CONNTRACK_EVENTS
19abb7b0 PNA	59	/* This structure is passed to event handler */
	60	struct nf_ct_event {
	61	struct nf_conn *ct;
15e47304	62	u32 portid;
19abb7b0 PNA	63	int report;
	64	};
	65
e34d5c1a PNA	66	struct nf_ct_event_notifier {
	67	int (fcn)(unsigned int events, struct nf_ct_event item);
	68	};
	69
4e77be46 JP	70	int nf_conntrack_register_notifier(struct net *net,
	71	struct nf_ct_event_notifier *nb);
	72	void nf_conntrack_unregister_notifier(struct net *net,
	73	struct nf_ct_event_notifier *nb);
f6180121	74
4e77be46	75	void nf_ct_deliver_cached_events(struct nf_conn *ct);
3c435e2e FW	76	int nf_conntrack_eventmask_report(unsigned int eventmask, struct nf_conn *ct,
3c435e2e FW	77	u32 portid, int report);
f6180121 MJ	78
f6180121 MJ	79	static inline void
a71996fc	80	nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
f6180121	81	{
70e9942f	82	struct net *net = nf_ct_net(ct);
a0891aa6 PNA	83	struct nf_conntrack_ecache *e;
a0891aa6 PNA	84
6bd0405b	85	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
a0891aa6 PNA	86	return;
	87
	88	e = nf_ct_ecache_find(ct);
	89	if (e == NULL)
	90	return;
	91
	92	set_bit(event, &e->cache);
f6180121 MJ	93	}
f6180121 MJ	94
dd7669a9	95	static inline int
a0891aa6	96	nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
15e47304	97	u32 portid, int report)
a0891aa6	98	{
3c435e2e FW	99	const struct net *net = nf_ct_net(ct);
	100
	101	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
	102	return 0;
	103
15e47304	104	return nf_conntrack_eventmask_report(1 << event, ct, portid, report);
a0891aa6 PNA	105	}
a0891aa6 PNA	106
dd7669a9	107	static inline int
19abb7b0 PNA	108	nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
19abb7b0 PNA	109	{
3c435e2e FW	110	const struct net *net = nf_ct_net(ct);
	111
	112	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
	113	return 0;
	114
dd7669a9	115	return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
19abb7b0 PNA	116	}
	117
	118	struct nf_exp_event {
	119	struct nf_conntrack_expect *exp;
15e47304	120	u32 portid;
19abb7b0 PNA	121	int report;
	122	};
	123
e34d5c1a PNA	124	struct nf_exp_event_notifier {
	125	int (fcn)(unsigned int events, struct nf_exp_event item);
	126	};
	127
4e77be46 JP	128	int nf_ct_expect_register_notifier(struct net *net,
	129	struct nf_exp_event_notifier *nb);
	130	void nf_ct_expect_unregister_notifier(struct net *net,
	131	struct nf_exp_event_notifier *nb);
010c7d6f	132
ecdfb48c FW	133	void nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
	134	struct nf_conntrack_expect *exp,
	135	u32 portid, int report);
f6180121	136
4e77be46 JP	137	int nf_conntrack_ecache_pernet_init(struct net *net);
4e77be46 JP	138	void nf_conntrack_ecache_pernet_fini(struct net *net);
6058fa6b	139
4e77be46 JP	140	int nf_conntrack_ecache_init(void);
4e77be46 JP	141	void nf_conntrack_ecache_fini(void);
f6180121	142
9500507c FW	143	static inline void nf_conntrack_ecache_delayed_work(struct net *net)
	144	{
	145	if (!delayed_work_pending(&net->ct.ecache_dwork)) {
	146	schedule_delayed_work(&net->ct.ecache_dwork, HZ);
	147	net->ct.ecache_dwork_pending = true;
	148	}
	149	}
	150
	151	static inline void nf_conntrack_ecache_work(struct net *net)
	152	{
	153	if (net->ct.ecache_dwork_pending) {
	154	net->ct.ecache_dwork_pending = false;
	155	mod_delayed_work(system_wq, &net->ct.ecache_dwork, 0);
	156	}
	157	}
	158	#else /* CONFIG_NF_CONNTRACK_EVENTS */
f6180121	159	static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
64f1b653	160	struct nf_conn *ct) {}
dd7669a9 PNA	161	static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
dd7669a9 PNA	162	struct nf_conn *ct,
15e47304	163	u32 portid,
dd7669a9 PNA	164	int report) { return 0; }
	165	static inline int nf_conntrack_event(enum ip_conntrack_events event,
	166	struct nf_conn *ct) { return 0; }
	167	static inline int nf_conntrack_event_report(enum ip_conntrack_events event,
	168	struct nf_conn *ct,
15e47304	169	u32 portid,
dd7669a9	170	int report) { return 0; }
f6180121	171	static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
19abb7b0 PNA	172	static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
19abb7b0 PNA	173	struct nf_conntrack_expect *exp,
15e47304	174	u32 portid,
19abb7b0	175	int report) {}
6058fa6b	176
3fe0f943	177	static inline int nf_conntrack_ecache_pernet_init(struct net *net)
6058fa6b AD	178	{
6058fa6b AD	179	return 0;
bb21c95e	180	}
6058fa6b	181
3fe0f943 G	182	static inline void nf_conntrack_ecache_pernet_fini(struct net *net)
	183	{
	184	}
	185
	186	static inline int nf_conntrack_ecache_init(void)
	187	{
	188	return 0;
	189	}
	190
	191	static inline void nf_conntrack_ecache_fini(void)
6058fa6b AD	192	{
6058fa6b AD	193	}
9500507c FW	194
	195	static inline void nf_conntrack_ecache_delayed_work(struct net *net)
	196	{
	197	}
	198
	199	static inline void nf_conntrack_ecache_work(struct net *net)
	200	{
	201	}
f6180121 MJ	202	#endif /* CONFIG_NF_CONNTRACK_EVENTS */
	203
	204	#endif /_NF_CONNTRACK_ECACHE_H/
	205