[deliverable/linux.git] / drivers / connector / cn_proc.c

/*
 * cn_proc.c - process events connector
 *
 * Copyright (C) Matt Helsley, IBM Corp. 2005
 * Based on cn_fork.c by Guillaume Thouvenin <guillaume.thouvenin@bull.net>
 * Original copyright notice follows:
 * Copyright (C) 2005 BULL SA.
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ktime.h>
#include <linux/init.h>
#include <linux/connector.h>
#include <linux/gfp.h>
#include <linux/ptrace.h>
#include <linux/atomic.h>

#include <asm/unaligned.h>

#include <linux/cn_proc.h>

#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event))

static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };

/* proc_event_counts is used as the sequence number of the netlink message */
static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };

static inline void get_seq(__u32 *ts, int *cpu)
{
	preempt_disable();
	*ts = __this_cpu_inc_return(proc_event_counts) -1;
	*cpu = smp_processor_id();
	preempt_enable();
}

void proc_fork_connector(struct task_struct *task)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE];
	struct timespec ts;
	struct task_struct *parent;

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = (struct cn_msg*)buffer;
	ev = (struct proc_event*)msg->data;
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	ev->what = PROC_EVENT_FORK;
	rcu_read_lock();
	parent = rcu_dereference(task->real_parent);
	ev->event_data.fork.parent_pid = parent->pid;
	ev->event_data.fork.parent_tgid = parent->tgid;
	rcu_read_unlock();
	ev->event_data.fork.child_pid = task->pid;
	ev->event_data.fork.child_tgid = task->tgid;

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	/*  If cn_netlink_send() failed, the data is not sent */
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

void proc_exec_connector(struct task_struct *task)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	struct timespec ts;
	__u8 buffer[CN_PROC_MSG_SIZE];

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = (struct cn_msg*)buffer;
	ev = (struct proc_event*)msg->data;
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	ev->what = PROC_EVENT_EXEC;
	ev->event_data.exec.process_pid = task->pid;
	ev->event_data.exec.process_tgid = task->tgid;

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

void proc_id_connector(struct task_struct *task, int which_id)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE];
	struct timespec ts;
	const struct cred *cred;

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = (struct cn_msg*)buffer;
	ev = (struct proc_event*)msg->data;
	ev->what = which_id;
	ev->event_data.id.process_pid = task->pid;
	ev->event_data.id.process_tgid = task->tgid;
	rcu_read_lock();
	cred = __task_cred(task);
	if (which_id == PROC_EVENT_UID) {
		ev->event_data.id.r.ruid = cred->uid;
		ev->event_data.id.e.euid = cred->euid;
	} else if (which_id == PROC_EVENT_GID) {
		ev->event_data.id.r.rgid = cred->gid;
		ev->event_data.id.e.egid = cred->egid;
	} else {
		rcu_read_unlock();
	     	return;
	}
	rcu_read_unlock();
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

void proc_sid_connector(struct task_struct *task)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	struct timespec ts;
	__u8 buffer[CN_PROC_MSG_SIZE];

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = (struct cn_msg *)buffer;
	ev = (struct proc_event *)msg->data;
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	ev->what = PROC_EVENT_SID;
	ev->event_data.sid.process_pid = task->pid;
	ev->event_data.sid.process_tgid = task->tgid;

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	struct timespec ts;
	__u8 buffer[CN_PROC_MSG_SIZE];

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = (struct cn_msg *)buffer;
	ev = (struct proc_event *)msg->data;
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	ev->what = PROC_EVENT_PTRACE;
	ev->event_data.ptrace.process_pid  = task->pid;
	ev->event_data.ptrace.process_tgid = task->tgid;
	if (ptrace_id == PTRACE_ATTACH) {
		ev->event_data.ptrace.tracer_pid  = current->pid;
		ev->event_data.ptrace.tracer_tgid = current->tgid;
	} else if (ptrace_id == PTRACE_DETACH) {
		ev->event_data.ptrace.tracer_pid  = 0;
		ev->event_data.ptrace.tracer_tgid = 0;
	} else
		return;

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

void proc_comm_connector(struct task_struct *task)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	struct timespec ts;
	__u8 buffer[CN_PROC_MSG_SIZE];

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = (struct cn_msg *)buffer;
	ev = (struct proc_event *)msg->data;
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	ev->what = PROC_EVENT_COMM;
	ev->event_data.comm.process_pid  = task->pid;
	ev->event_data.comm.process_tgid = task->tgid;
	get_task_comm(ev->event_data.comm.comm, task);

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

void proc_exit_connector(struct task_struct *task)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE];
	struct timespec ts;

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = (struct cn_msg*)buffer;
	ev = (struct proc_event*)msg->data;
	get_seq(&msg->seq, &ev->cpu);
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	ev->what = PROC_EVENT_EXIT;
	ev->event_data.exit.process_pid = task->pid;
	ev->event_data.exit.process_tgid = task->tgid;
	ev->event_data.exit.exit_code = task->exit_code;
	ev->event_data.exit.exit_signal = task->exit_signal;

	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = 0; /* not used */
	msg->len = sizeof(*ev);
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

/*
 * Send an acknowledgement message to userspace
 *
 * Use 0 for success, EFOO otherwise.
 * Note: this is the negative of conventional kernel error
 * values because it's not being returned via syscall return
 * mechanisms.
 */
static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
{
	struct cn_msg *msg;
	struct proc_event *ev;
	__u8 buffer[CN_PROC_MSG_SIZE];
	struct timespec ts;

	if (atomic_read(&proc_event_num_listeners) < 1)
		return;

	msg = (struct cn_msg*)buffer;
	ev = (struct proc_event*)msg->data;
	msg->seq = rcvd_seq;
	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	ev->cpu = -1;
	ev->what = PROC_EVENT_NONE;
	ev->event_data.ack.err = err;
	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	msg->ack = rcvd_ack + 1;
	msg->len = sizeof(*ev);
	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
}

/**
 * cn_proc_mcast_ctl
 * @data: message sent from userspace via the connector
 */
static void cn_proc_mcast_ctl(struct cn_msg *msg,
			      struct netlink_skb_parms *nsp)
{
	enum proc_cn_mcast_op *mc_op = NULL;
	int err = 0;

	if (msg->len != sizeof(*mc_op))
		return;

	mc_op = (enum proc_cn_mcast_op*)msg->data;
	switch (*mc_op) {
	case PROC_CN_MCAST_LISTEN:
		atomic_inc(&proc_event_num_listeners);
		break;
	case PROC_CN_MCAST_IGNORE:
		atomic_dec(&proc_event_num_listeners);
		break;
	default:
		err = EINVAL;
		break;
	}
	cn_proc_ack(err, msg->seq, msg->ack);
}

/*
 * cn_proc_init - initialization entry point
 *
 * Adds the connector callback to the connector driver.
 */
static int __init cn_proc_init(void)
{
	int err;

	if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc",
	 			   &cn_proc_mcast_ctl))) {
		printk(KERN_WARNING "cn_proc failed to register\n");
		return err;
	}
	return 0;
}

module_init(cn_proc_init);
Commit	Line	Data
9f46080c MH	1	/*
	2	* cn_proc.c - process events connector
	3	*
	4	* Copyright (C) Matt Helsley, IBM Corp. 2005
	5	* Based on cn_fork.c by Guillaume Thouvenin <guillaume.thouvenin@bull.net>
	6	* Original copyright notice follows:
	7	* Copyright (C) 2005 BULL SA.
	8	*
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*/
	24
	25	#include <linux/module.h>
	26	#include <linux/kernel.h>
caf3c9dc	27	#include <linux/ktime.h>
9f46080c	28	#include <linux/init.h>
1d31a4ea	29	#include <linux/connector.h>
5a0e3ad6	30	#include <linux/gfp.h>
f701e5b7	31	#include <linux/ptrace.h>
60063497 AS	32	#include <linux/atomic.h>
60063497 AS	33
af3e095a	34	#include <asm/unaligned.h>
9f46080c MH	35
	36	#include <linux/cn_proc.h>
	37
	38	#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event))
	39
	40	static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
	41	static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };
	42
cc398c2e	43	/* proc_event_counts is used as the sequence number of the netlink message */
9f46080c MH	44	static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
	45
	46	static inline void get_seq(__u32 ts, int cpu)
	47	{
3ea9f683 CL	48	preempt_disable();
3ea9f683 CL	49	*ts = __this_cpu_inc_return(proc_event_counts) -1;
9f46080c	50	*cpu = smp_processor_id();
3ea9f683	51	preempt_enable();
9f46080c MH	52	}
	53
	54	void proc_fork_connector(struct task_struct *task)
	55	{
	56	struct cn_msg *msg;
	57	struct proc_event *ev;
	58	__u8 buffer[CN_PROC_MSG_SIZE];
822cfbff	59	struct timespec ts;
9e8f90df	60	struct task_struct *parent;
9f46080c MH	61
	62	if (atomic_read(&proc_event_num_listeners) < 1)
	63	return;
	64
	65	msg = (struct cn_msg*)buffer;
	66	ev = (struct proc_event*)msg->data;
	67	get_seq(&msg->seq, &ev->cpu);
822cfbff	68	ktime_get_ts(&ts); /* get high res monotonic timestamp */
af3e095a	69	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
9f46080c	70	ev->what = PROC_EVENT_FORK;
9e8f90df ON	71	rcu_read_lock();
	72	parent = rcu_dereference(task->real_parent);
	73	ev->event_data.fork.parent_pid = parent->pid;
	74	ev->event_data.fork.parent_tgid = parent->tgid;
	75	rcu_read_unlock();
9f46080c MH	76	ev->event_data.fork.child_pid = task->pid;
	77	ev->event_data.fork.child_tgid = task->tgid;
	78
	79	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	80	msg->ack = 0; /* not used */
	81	msg->len = sizeof(*ev);
	82	/* If cn_netlink_send() failed, the data is not sent */
	83	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	84	}
	85
	86	void proc_exec_connector(struct task_struct *task)
	87	{
	88	struct cn_msg *msg;
	89	struct proc_event *ev;
822cfbff	90	struct timespec ts;
9f46080c MH	91	__u8 buffer[CN_PROC_MSG_SIZE];
	92
	93	if (atomic_read(&proc_event_num_listeners) < 1)
	94	return;
	95
	96	msg = (struct cn_msg*)buffer;
	97	ev = (struct proc_event*)msg->data;
	98	get_seq(&msg->seq, &ev->cpu);
822cfbff	99	ktime_get_ts(&ts); /* get high res monotonic timestamp */
af3e095a	100	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
9f46080c MH	101	ev->what = PROC_EVENT_EXEC;
	102	ev->event_data.exec.process_pid = task->pid;
	103	ev->event_data.exec.process_tgid = task->tgid;
	104
	105	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	106	msg->ack = 0; /* not used */
	107	msg->len = sizeof(*ev);
	108	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	109	}
	110
	111	void proc_id_connector(struct task_struct *task, int which_id)
	112	{
	113	struct cn_msg *msg;
	114	struct proc_event *ev;
	115	__u8 buffer[CN_PROC_MSG_SIZE];
822cfbff	116	struct timespec ts;
c69e8d9c	117	const struct cred *cred;
9f46080c MH	118
	119	if (atomic_read(&proc_event_num_listeners) < 1)
	120	return;
	121
	122	msg = (struct cn_msg*)buffer;
	123	ev = (struct proc_event*)msg->data;
	124	ev->what = which_id;
	125	ev->event_data.id.process_pid = task->pid;
	126	ev->event_data.id.process_tgid = task->tgid;
c69e8d9c DH	127	rcu_read_lock();
c69e8d9c DH	128	cred = __task_cred(task);
9f46080c	129	if (which_id == PROC_EVENT_UID) {
c69e8d9c DH	130	ev->event_data.id.r.ruid = cred->uid;
c69e8d9c DH	131	ev->event_data.id.e.euid = cred->euid;
9f46080c	132	} else if (which_id == PROC_EVENT_GID) {
c69e8d9c DH	133	ev->event_data.id.r.rgid = cred->gid;
	134	ev->event_data.id.e.egid = cred->egid;
	135	} else {
	136	rcu_read_unlock();
9f46080c	137	return;
c69e8d9c DH	138	}
c69e8d9c DH	139	rcu_read_unlock();
9f46080c	140	get_seq(&msg->seq, &ev->cpu);
822cfbff	141	ktime_get_ts(&ts); /* get high res monotonic timestamp */
af3e095a	142	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
9f46080c MH	143
	144	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	145	msg->ack = 0; /* not used */
	146	msg->len = sizeof(*ev);
	147	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	148	}
	149
02b51df1 SJR	150	void proc_sid_connector(struct task_struct *task)
	151	{
	152	struct cn_msg *msg;
	153	struct proc_event *ev;
	154	struct timespec ts;
	155	__u8 buffer[CN_PROC_MSG_SIZE];
	156
	157	if (atomic_read(&proc_event_num_listeners) < 1)
	158	return;
	159
	160	msg = (struct cn_msg *)buffer;
	161	ev = (struct proc_event *)msg->data;
	162	get_seq(&msg->seq, &ev->cpu);
	163	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	164	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	165	ev->what = PROC_EVENT_SID;
	166	ev->event_data.sid.process_pid = task->pid;
	167	ev->event_data.sid.process_tgid = task->tgid;
	168
	169	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	170	msg->ack = 0; /* not used */
	171	msg->len = sizeof(*ev);
	172	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	173	}
	174
f701e5b7 VZ	175	void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
	176	{
	177	struct cn_msg *msg;
	178	struct proc_event *ev;
	179	struct timespec ts;
	180	__u8 buffer[CN_PROC_MSG_SIZE];
f701e5b7 VZ	181
	182	if (atomic_read(&proc_event_num_listeners) < 1)
	183	return;
	184
	185	msg = (struct cn_msg *)buffer;
	186	ev = (struct proc_event *)msg->data;
	187	get_seq(&msg->seq, &ev->cpu);
	188	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	189	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	190	ev->what = PROC_EVENT_PTRACE;
	191	ev->event_data.ptrace.process_pid = task->pid;
	192	ev->event_data.ptrace.process_tgid = task->tgid;
	193	if (ptrace_id == PTRACE_ATTACH) {
	194	ev->event_data.ptrace.tracer_pid = current->pid;
	195	ev->event_data.ptrace.tracer_tgid = current->tgid;
	196	} else if (ptrace_id == PTRACE_DETACH) {
	197	ev->event_data.ptrace.tracer_pid = 0;
	198	ev->event_data.ptrace.tracer_tgid = 0;
	199	} else
	200	return;
	201
	202	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	203	msg->ack = 0; /* not used */
	204	msg->len = sizeof(*ev);
	205	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	206	}
	207
f786ecba VZ	208	void proc_comm_connector(struct task_struct *task)
	209	{
	210	struct cn_msg *msg;
	211	struct proc_event *ev;
	212	struct timespec ts;
	213	__u8 buffer[CN_PROC_MSG_SIZE];
	214
	215	if (atomic_read(&proc_event_num_listeners) < 1)
	216	return;
	217
	218	msg = (struct cn_msg *)buffer;
	219	ev = (struct proc_event *)msg->data;
	220	get_seq(&msg->seq, &ev->cpu);
	221	ktime_get_ts(&ts); /* get high res monotonic timestamp */
	222	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
	223	ev->what = PROC_EVENT_COMM;
	224	ev->event_data.comm.process_pid = task->pid;
	225	ev->event_data.comm.process_tgid = task->tgid;
	226	get_task_comm(ev->event_data.comm.comm, task);
	227
	228	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	229	msg->ack = 0; /* not used */
	230	msg->len = sizeof(*ev);
	231	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	232	}
	233
9f46080c MH	234	void proc_exit_connector(struct task_struct *task)
	235	{
	236	struct cn_msg *msg;
	237	struct proc_event *ev;
	238	__u8 buffer[CN_PROC_MSG_SIZE];
822cfbff	239	struct timespec ts;
9f46080c MH	240
	241	if (atomic_read(&proc_event_num_listeners) < 1)
	242	return;
	243
	244	msg = (struct cn_msg*)buffer;
	245	ev = (struct proc_event*)msg->data;
	246	get_seq(&msg->seq, &ev->cpu);
822cfbff	247	ktime_get_ts(&ts); /* get high res monotonic timestamp */
af3e095a	248	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
9f46080c MH	249	ev->what = PROC_EVENT_EXIT;
	250	ev->event_data.exit.process_pid = task->pid;
	251	ev->event_data.exit.process_tgid = task->tgid;
	252	ev->event_data.exit.exit_code = task->exit_code;
	253	ev->event_data.exit.exit_signal = task->exit_signal;
	254
	255	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	256	msg->ack = 0; /* not used */
	257	msg->len = sizeof(*ev);
	258	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	259	}
	260
	261	/*
	262	* Send an acknowledgement message to userspace
	263	*
	264	* Use 0 for success, EFOO otherwise.
	265	* Note: this is the negative of conventional kernel error
	266	* values because it's not being returned via syscall return
	267	* mechanisms.
	268	*/
	269	static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
	270	{
	271	struct cn_msg *msg;
	272	struct proc_event *ev;
	273	__u8 buffer[CN_PROC_MSG_SIZE];
822cfbff	274	struct timespec ts;
9f46080c MH	275
	276	if (atomic_read(&proc_event_num_listeners) < 1)
	277	return;
	278
	279	msg = (struct cn_msg*)buffer;
	280	ev = (struct proc_event*)msg->data;
	281	msg->seq = rcvd_seq;
822cfbff	282	ktime_get_ts(&ts); /* get high res monotonic timestamp */
af3e095a	283	put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns);
9f46080c MH	284	ev->cpu = -1;
	285	ev->what = PROC_EVENT_NONE;
	286	ev->event_data.ack.err = err;
	287	memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
	288	msg->ack = rcvd_ack + 1;
	289	msg->len = sizeof(*ev);
	290	cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
	291	}
	292
	293	/**
	294	* cn_proc_mcast_ctl
	295	* @data: message sent from userspace via the connector
	296	*/
f0b25932 SB	297	static void cn_proc_mcast_ctl(struct cn_msg *msg,
f0b25932 SB	298	struct netlink_skb_parms *nsp)
9f46080c	299	{
9f46080c MH	300	enum proc_cn_mcast_op *mc_op = NULL;
	301	int err = 0;
	302
	303	if (msg->len != sizeof(*mc_op))
	304	return;
	305
	306	mc_op = (enum proc_cn_mcast_op*)msg->data;
	307	switch (*mc_op) {
	308	case PROC_CN_MCAST_LISTEN:
	309	atomic_inc(&proc_event_num_listeners);
	310	break;
	311	case PROC_CN_MCAST_IGNORE:
	312	atomic_dec(&proc_event_num_listeners);
	313	break;
	314	default:
	315	err = EINVAL;
	316	break;
	317	}
	318	cn_proc_ack(err, msg->seq, msg->ack);
	319	}
	320
	321	/*
	322	* cn_proc_init - initialization entry point
	323	*
	324	* Adds the connector callback to the connector driver.
	325	*/
	326	static int __init cn_proc_init(void)
	327	{
	328	int err;
	329
	330	if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc",
	331	&cn_proc_mcast_ctl))) {
	332	printk(KERN_WARNING "cn_proc failed to register\n");
	333	return err;
	334	}
	335	return 0;
	336	}
	337
	338	module_init(cn_proc_init);