[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 pid;		/* netlink pid 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 pid;
	int report;
};

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

extern int nf_conntrack_register_notifier(struct net *net, struct nf_ct_event_notifier *nb);
extern void nf_conntrack_unregister_notifier(struct net *net, 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 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_eventmask_report(unsigned int eventmask,
			      struct nf_conn *ct,
			      u32 pid,
			      int report)
{
	int ret = 0;
	struct net *net = nf_ct_net(ct);
	struct nf_ct_event_notifier *notify;
	struct nf_conntrack_ecache *e;

	rcu_read_lock();
	notify = rcu_dereference(net->ct.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 int nf_ct_expect_register_notifier(struct net *net, struct nf_exp_event_notifier *nb);
extern void nf_ct_expect_unregister_notifier(struct net *net, 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 net *net = nf_ct_exp_net(exp);
	struct nf_exp_event_notifier *notify;
	struct nf_conntrack_ecache *e;

	rcu_read_lock();
	notify = rcu_dereference(net->ct.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	{
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;
	62	u32 pid;
	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
70e9942f PNA	70	extern int nf_conntrack_register_notifier(struct net net, struct nf_ct_event_notifier nb);
70e9942f PNA	71	extern void nf_conntrack_unregister_notifier(struct net net, struct nf_ct_event_notifier nb);
f6180121	72
a0891aa6	73	extern void nf_ct_deliver_cached_events(struct nf_conn *ct);
f6180121 MJ	74
f6180121 MJ	75	static inline void
a71996fc	76	nf_conntrack_event_cache(enum ip_conntrack_events event, struct nf_conn *ct)
f6180121	77	{
70e9942f	78	struct net *net = nf_ct_net(ct);
a0891aa6 PNA	79	struct nf_conntrack_ecache *e;
a0891aa6 PNA	80
6bd0405b	81	if (!rcu_access_pointer(net->ct.nf_conntrack_event_cb))
a0891aa6 PNA	82	return;
	83
	84	e = nf_ct_ecache_find(ct);
	85	if (e == NULL)
	86	return;
	87
	88	set_bit(event, &e->cache);
f6180121 MJ	89	}
f6180121 MJ	90
dd7669a9	91	static inline int
a0891aa6 PNA	92	nf_conntrack_eventmask_report(unsigned int eventmask,
	93	struct nf_conn *ct,
	94	u32 pid,
	95	int report)
f6180121	96	{
dd7669a9	97	int ret = 0;
70e9942f	98	struct net *net = nf_ct_net(ct);
e34d5c1a	99	struct nf_ct_event_notifier *notify;
dd7669a9	100	struct nf_conntrack_ecache *e;
e34d5c1a PNA	101
e34d5c1a PNA	102	rcu_read_lock();
70e9942f	103	notify = rcu_dereference(net->ct.nf_conntrack_event_cb);
e34d5c1a PNA	104	if (notify == NULL)
	105	goto out_unlock;
	106
dd7669a9 PNA	107	e = nf_ct_ecache_find(ct);
	108	if (e == NULL)
	109	goto out_unlock;
	110
e34d5c1a PNA	111	if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) {
	112	struct nf_ct_event item = {
	113	.ct = ct,
dd7669a9	114	.pid = e->pid ? e->pid : pid,
e34d5c1a PNA	115	.report = report
e34d5c1a PNA	116	};
dd7669a9 PNA	117	/* This is a resent of a destroy event? If so, skip missed */
	118	unsigned long missed = e->pid ? 0 : e->missed;
	119
0cebe4b4 PM	120	if (!((eventmask \| missed) & e->ctmask))
	121	goto out_unlock;
	122
dd7669a9 PNA	123	ret = notify->fcn(eventmask \| missed, &item);
	124	if (unlikely(ret < 0 \|\| missed)) {
	125	spin_lock_bh(&ct->lock);
	126	if (ret < 0) {
	127	/* This is a destroy event that has been
	128	* triggered by a process, we store the PID
	129	* to include it in the retransmission. */
	130	if (eventmask & (1 << IPCT_DESTROY) &&
	131	e->pid == 0 && pid != 0)
	132	e->pid = pid;
	133	else
	134	e->missed \|= eventmask;
	135	} else
	136	e->missed &= ~missed;
	137	spin_unlock_bh(&ct->lock);
	138	}
e34d5c1a PNA	139	}
	140	out_unlock:
	141	rcu_read_unlock();
dd7669a9	142	return ret;
f6180121 MJ	143	}
f6180121 MJ	144
dd7669a9	145	static inline int
a0891aa6 PNA	146	nf_conntrack_event_report(enum ip_conntrack_events event, struct nf_conn *ct,
	147	u32 pid, int report)
	148	{
dd7669a9	149	return nf_conntrack_eventmask_report(1 << event, ct, pid, report);
a0891aa6 PNA	150	}
a0891aa6 PNA	151
dd7669a9	152	static inline int
19abb7b0 PNA	153	nf_conntrack_event(enum ip_conntrack_events event, struct nf_conn *ct)
19abb7b0 PNA	154	{
dd7669a9	155	return nf_conntrack_eventmask_report(1 << event, ct, 0, 0);
19abb7b0 PNA	156	}
	157
	158	struct nf_exp_event {
	159	struct nf_conntrack_expect *exp;
	160	u32 pid;
	161	int report;
	162	};
	163
e34d5c1a PNA	164	struct nf_exp_event_notifier {
	165	int (fcn)(unsigned int events, struct nf_exp_event item);
	166	};
	167
70e9942f PNA	168	extern int nf_ct_expect_register_notifier(struct net net, struct nf_exp_event_notifier nb);
70e9942f PNA	169	extern void nf_ct_expect_unregister_notifier(struct net net, struct nf_exp_event_notifier nb);
010c7d6f	170
19abb7b0 PNA	171	static inline void
	172	nf_ct_expect_event_report(enum ip_conntrack_expect_events event,
	173	struct nf_conntrack_expect *exp,
	174	u32 pid,
	175	int report)
	176	{
70e9942f	177	struct net *net = nf_ct_exp_net(exp);
e34d5c1a	178	struct nf_exp_event_notifier *notify;
0cebe4b4	179	struct nf_conntrack_ecache *e;
e34d5c1a PNA	180
e34d5c1a PNA	181	rcu_read_lock();
70e9942f	182	notify = rcu_dereference(net->ct.nf_expect_event_cb);
e34d5c1a PNA	183	if (notify == NULL)
	184	goto out_unlock;
	185
0cebe4b4 PM	186	e = nf_ct_ecache_find(exp->master);
0cebe4b4 PM	187	if (e == NULL)
a0891aa6 PNA	188	goto out_unlock;
a0891aa6 PNA	189
0cebe4b4	190	if (e->expmask & (1 << event)) {
e34d5c1a PNA	191	struct nf_exp_event item = {
	192	.exp = exp,
	193	.pid = pid,
	194	.report = report
	195	};
a0891aa6	196	notify->fcn(1 << event, &item);
e34d5c1a PNA	197	}
	198	out_unlock:
	199	rcu_read_unlock();
19abb7b0 PNA	200	}
19abb7b0 PNA	201
f6180121	202	static inline void
6823645d PM	203	nf_ct_expect_event(enum ip_conntrack_expect_events event,
6823645d PM	204	struct nf_conntrack_expect *exp)
f6180121	205	{
19abb7b0	206	nf_ct_expect_event_report(event, exp, 0, 0);
f6180121 MJ	207	}
f6180121 MJ	208
6058fa6b AD	209	extern int nf_conntrack_ecache_init(struct net *net);
	210	extern void nf_conntrack_ecache_fini(struct net *net);
	211
f6180121 MJ	212	#else /* CONFIG_NF_CONNTRACK_EVENTS */
	213
	214	static inline void nf_conntrack_event_cache(enum ip_conntrack_events event,
64f1b653	215	struct nf_conn *ct) {}
dd7669a9 PNA	216	static inline int nf_conntrack_eventmask_report(unsigned int eventmask,
	217	struct nf_conn *ct,
	218	u32 pid,
	219	int report) { return 0; }
	220	static inline int nf_conntrack_event(enum ip_conntrack_events event,
	221	struct nf_conn *ct) { return 0; }
	222	static inline int nf_conntrack_event_report(enum ip_conntrack_events event,
	223	struct nf_conn *ct,
	224	u32 pid,
	225	int report) { return 0; }
f6180121	226	static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {}
6823645d PM	227	static inline void nf_ct_expect_event(enum ip_conntrack_expect_events event,
6823645d PM	228	struct nf_conntrack_expect *exp) {}
19abb7b0 PNA	229	static inline void nf_ct_expect_event_report(enum ip_conntrack_expect_events e,
	230	struct nf_conntrack_expect *exp,
	231	u32 pid,
	232	int report) {}
6058fa6b AD	233
	234	static inline int nf_conntrack_ecache_init(struct net *net)
	235	{
	236	return 0;
bb21c95e	237	}
6058fa6b AD	238
	239	static inline void nf_conntrack_ecache_fini(struct net *net)
	240	{
	241	}
f6180121 MJ	242	#endif /* CONFIG_NF_CONNTRACK_EVENTS */
	243
	244	#endif /_NF_CONNTRACK_ECACHE_H/
	245