[net-next-2.6.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 pid;		/* netlink pid of destroyer */
};

static inline struct nf_conntrack_ecache *
nf_ct_ecache_find(const struct nf_conn *ct)
{
	return nf_ct_ext_find(ct, NF_CT_EXT_ECACHE);
}

static inline struct nf_conntrack_ecache *
nf_ct_ecache_ext_add(struct nf_conn *ct, u16 ctmask, u16 expmask, gfp_t gfp)
{
	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;
};

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

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

extern struct nf_ct_event_notifier *nf_conntrack_event_cb;
extern int nf_conntrack_register_notifier(struct nf_ct_event_notifier *nb);
extern void nf_conntrack_unregister_notifier(struct nf_ct_event_notifier *nb);

extern void nf_ct_deliver_cached_events(struct nf_conn *ct);

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

	if (nf_conntrack_event_cb == NULL)
		return;

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

	if (!(e->ctmask & (1 << event)))
		return;

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

static inline int
nf_conntrack_eventmask_report(unsigned int eventmask,
			      struct nf_conn *ct,
			      u32 pid,
			      int report)
{
	int ret = 0;
	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;

	e = nf_ct_ecache_find(ct);
	if (e == NULL)
		goto out_unlock;

	if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) {
		struct nf_ct_event item = {
			.ct 	= ct,
			.pid	= e->pid ? e->pid : pid,
			.report = report
		};
		/* This is a resent of a destroy event? If so, skip missed */
		unsigned long missed = e->pid ? 0 : e->missed;

		if (!((eventmask | missed) & e->ctmask))
			goto out_unlock;

		ret = notify->fcn(eventmask | missed, &item);
		if (unlikely(ret < 0 || missed)) {
			spin_lock_bh(&ct->lock);
			if (ret < 0) {
				/* This is a destroy event that has been
				 * triggered by a process, we store the PID
				 * to include it in the retransmission. */
				if (eventmask & (1 << IPCT_DESTROY) &&
				    e->pid == 0 && pid != 0)
					e->pid = pid;
				else
					e->missed |= eventmask;
			} else
				e->missed &= ~missed;
			spin_unlock_bh(&ct->lock);
		}
	}
out_unlock:
	rcu_read_unlock();
	return ret;
}

static inline int
nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
			  u32 pid, int report)
{
	return nf_conntrack_eventmask_report(1 << event, ct, pid, report);
}

static inline int
nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
{
	return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
}

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

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

extern struct nf_exp_event_notifier *nf_expect_event_cb;
extern int nf_ct_expect_register_notifier(struct nf_exp_event_notifier *nb);
extern void nf_ct_expect_unregister_notifier(struct nf_exp_event_notifier *nb);

static inline void
nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
			  struct nf_conntrack_expect *exp,
			  u32 pid,
			  int report)
{
	struct nf_exp_event_notifier *notify;
	struct nf_conntrack_ecache *e;

	rcu_read_lock();
	notify = rcu_dereference(nf_expect_event_cb);
	if (notify == NULL)
		goto out_unlock;

	e = nf_ct_ecache_find(exp->master);
	if (e == NULL)
		goto out_unlock;

	if (e->expmask & (1 << event)) {
		struct nf_exp_event item = {
			.exp	= exp,
			.pid	= pid,
			.report = report
		};
		notify->fcn(1 << event, &item);
	}
out_unlock:
	rcu_read_unlock();
}

static inline void
nf_ct_expect_event(enum ip_conntrack_expect_events event,
		   struct nf_conntrack_expect *exp)
{
	nf_ct_expect_event_report(event, exp, 0, 0);
}

extern int nf_conntrack_ecache_init(struct net *net);
extern void nf_conntrack_ecache_fini(struct net *net);

#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 pid,
						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 pid,
					    int report) { return 0; }
static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event,
				      struct nf_conntrack_expect *exp) {}
static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
					     struct nf_conntrack_expect *exp,
 					     u32 pid,
 					     int report) {}

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

static inline void nf_conntrack_ecache_fini(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 */
	20	u32 pid; /* netlink pid 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	{
	26	return nf_ct_ext_find(ct, NF_CT_EXT_ECACHE);
	27	}
6bfea198	28
a0891aa6	29	static inline struct nf_conntrack_ecache *
0cebe4b4	30	nf_ct_ecache_ext_add(struct nf_conn *ct, u16 ctmask, u16 expmask, gfp_t gfp)
a0891aa6 PNA	31	{
a0891aa6 PNA	32	struct net *net = nf_ct_net(ct);
0cebe4b4	33	struct nf_conntrack_ecache *e;
6bfea198	34
0cebe4b4 PM	35	if (!ctmask && !expmask && net->ct.sysctl_events) {
	36	ctmask = ~0;
	37	expmask = ~0;
	38	}
	39	if (!ctmask && !expmask)
a0891aa6	40	return NULL;
6bfea198	41
0cebe4b4 PM	42	e = nf_ct_ext_add(ct, NF_CT_EXT_ECACHE, gfp);
	43	if (e) {
	44	e->ctmask = ctmask;
	45	e->expmask = expmask;
	46	}
	47	return e;
6bfea198 PNA	48	};
6bfea198 PNA	49
f6180121	50	#ifdef CONFIG_NF_CONNTRACK_EVENTS
19abb7b0 PNA	51	/* This structure is passed to event handler */
	52	struct nf_ct_event {
	53	struct nf_conn *ct;
	54	u32 pid;
	55	int report;
	56	};
	57
e34d5c1a PNA	58	struct nf_ct_event_notifier {
	59	int (fcn)(unsigned int events, struct nf_ct_event item);
	60	};
	61
	62	extern struct nf_ct_event_notifier *nf_conntrack_event_cb;
	63	extern int nf_conntrack_register_notifier(struct nf_ct_event_notifier *nb);
	64	extern void nf_conntrack_unregister_notifier(struct nf_ct_event_notifier *nb);
f6180121	65
a0891aa6	66	extern void nf_ct_deliver_cached_events(struct nf_conn *ct);
f6180121 MJ	67
f6180121 MJ	68	static inline void
a71996fc	69	nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
f6180121	70	{
a0891aa6 PNA	71	struct nf_conntrack_ecache *e;
	72
	73	if (nf_conntrack_event_cb == NULL)
	74	return;
	75
	76	e = nf_ct_ecache_find(ct);
	77	if (e == NULL)
	78	return;
	79
0cebe4b4 PM	80	if (!(e->ctmask & (1 << event)))
	81	return;
	82
a0891aa6	83	set_bit(event, &e->cache);
f6180121 MJ	84	}
f6180121 MJ	85
dd7669a9	86	static inline int
a0891aa6 PNA	87	nf_conntrack_eventmask_report(unsigned int eventmask,
	88	struct nf_conn *ct,
	89	u32 pid,
	90	int report)
f6180121	91	{
dd7669a9	92	int ret = 0;
e34d5c1a	93	struct nf_ct_event_notifier *notify;
dd7669a9	94	struct nf_conntrack_ecache *e;
e34d5c1a PNA	95
	96	rcu_read_lock();
	97	notify = rcu_dereference(nf_conntrack_event_cb);
	98	if (notify == NULL)
	99	goto out_unlock;
	100
dd7669a9 PNA	101	e = nf_ct_ecache_find(ct);
	102	if (e == NULL)
	103	goto out_unlock;
	104
e34d5c1a PNA	105	if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) {
	106	struct nf_ct_event item = {
	107	.ct = ct,
dd7669a9	108	.pid = e->pid ? e->pid : pid,
e34d5c1a PNA	109	.report = report
e34d5c1a PNA	110	};
dd7669a9 PNA	111	/* This is a resent of a destroy event? If so, skip missed */
	112	unsigned long missed = e->pid ? 0 : e->missed;
	113
0cebe4b4 PM	114	if (!((eventmask \| missed) & e->ctmask))
	115	goto out_unlock;
	116
dd7669a9 PNA	117	ret = notify->fcn(eventmask \| missed, &item);
	118	if (unlikely(ret < 0 \|\| missed)) {
	119	spin_lock_bh(&ct->lock);
	120	if (ret < 0) {
	121	/* This is a destroy event that has been
	122	* triggered by a process, we store the PID
	123	* to include it in the retransmission. */
	124	if (eventmask & (1 << IPCT_DESTROY) &&
	125	e->pid == 0 && pid != 0)
	126	e->pid = pid;
	127	else
	128	e->missed \|= eventmask;
	129	} else
	130	e->missed &= ~missed;
	131	spin_unlock_bh(&ct->lock);
	132	}
e34d5c1a PNA	133	}
	134	out_unlock:
	135	rcu_read_unlock();
dd7669a9	136	return ret;
f6180121 MJ	137	}
f6180121 MJ	138
dd7669a9	139	static inline int
a0891aa6 PNA	140	nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
	141	u32 pid, int report)
	142	{
dd7669a9	143	return nf_conntrack_eventmask_report(1 << event, ct, pid, report);
a0891aa6 PNA	144	}
a0891aa6 PNA	145
dd7669a9	146	static inline int
19abb7b0 PNA	147	nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
19abb7b0 PNA	148	{
dd7669a9	149	return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
19abb7b0 PNA	150	}
	151
	152	struct nf_exp_event {
	153	struct nf_conntrack_expect *exp;
	154	u32 pid;
	155	int report;
	156	};
	157
e34d5c1a PNA	158	struct nf_exp_event_notifier {
	159	int (fcn)(unsigned int events, struct nf_exp_event item);
	160	};
	161
	162	extern struct nf_exp_event_notifier *nf_expect_event_cb;
	163	extern int nf_ct_expect_register_notifier(struct nf_exp_event_notifier *nb);
	164	extern void nf_ct_expect_unregister_notifier(struct nf_exp_event_notifier *nb);
010c7d6f	165
19abb7b0 PNA	166	static inline void
	167	nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
	168	struct nf_conntrack_expect *exp,
	169	u32 pid,
	170	int report)
	171	{
e34d5c1a	172	struct nf_exp_event_notifier *notify;
0cebe4b4	173	struct nf_conntrack_ecache *e;
e34d5c1a PNA	174
	175	rcu_read_lock();
	176	notify = rcu_dereference(nf_expect_event_cb);
	177	if (notify == NULL)
	178	goto out_unlock;
	179
0cebe4b4 PM	180	e = nf_ct_ecache_find(exp->master);
0cebe4b4 PM	181	if (e == NULL)
a0891aa6 PNA	182	goto out_unlock;
a0891aa6 PNA	183
0cebe4b4	184	if (e->expmask & (1 << event)) {
e34d5c1a PNA	185	struct nf_exp_event item = {
	186	.exp = exp,
	187	.pid = pid,
	188	.report = report
	189	};
a0891aa6	190	notify->fcn(1 << event, &item);
e34d5c1a PNA	191	}
	192	out_unlock:
	193	rcu_read_unlock();
19abb7b0 PNA	194	}
19abb7b0 PNA	195
f6180121	196	static inline void
6823645d PM	197	nf_ct_expect_event(enum ip_conntrack_expect_events event,
6823645d PM	198	struct nf_conntrack_expect *exp)
f6180121	199	{
19abb7b0	200	nf_ct_expect_event_report(event, exp, 0, 0);
f6180121 MJ	201	}
f6180121 MJ	202
6058fa6b AD	203	extern int nf_conntrack_ecache_init(struct net *net);
	204	extern void nf_conntrack_ecache_fini(struct net *net);
	205
f6180121 MJ	206	#else /* CONFIG_NF_CONNTRACK_EVENTS */
	207
	208	static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
64f1b653	209	struct nf_conn *ct) {}
dd7669a9 PNA	210	static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
	211	struct nf_conn *ct,
	212	u32 pid,
	213	int report) { return 0; }
	214	static inline int nf_conntrack_event(enum ip_conntrack_events event,
	215	struct nf_conn *ct) { return 0; }
	216	static inline int nf_conntrack_event_report(enum ip_conntrack_events event,
	217	struct nf_conn *ct,
	218	u32 pid,
	219	int report) { return 0; }
f6180121	220	static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
6823645d PM	221	static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event,
6823645d PM	222	struct nf_conntrack_expect *exp) {}
19abb7b0 PNA	223	static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
	224	struct nf_conntrack_expect *exp,
	225	u32 pid,
	226	int report) {}
6058fa6b AD	227
	228	static inline int nf_conntrack_ecache_init(struct net *net)
	229	{
	230	return 0;
bb21c95e	231	}
6058fa6b AD	232
	233	static inline void nf_conntrack_ecache_fini(struct net *net)
	234	{
	235	}
f6180121 MJ	236	#endif /* CONFIG_NF_CONNTRACK_EVENTS */
	237
	238	#endif /_NF_CONNTRACK_ECACHE_H/
	239