2 * cn_proc.c - process events connector
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.
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.
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.
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
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 #include <linux/ktime.h>
28 #include <linux/init.h>
29 #include <linux/connector.h>
30 #include <asm/atomic.h>
32 #include <linux/cn_proc.h>
34 #define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event))
36 static atomic_t proc_event_num_listeners
= ATOMIC_INIT(0);
37 static struct cb_id cn_proc_event_id
= { CN_IDX_PROC
, CN_VAL_PROC
};
39 /* proc_event_counts is used as the sequence number of the netlink message */
40 static DEFINE_PER_CPU(__u32
, proc_event_counts
) = { 0 };
42 static inline void get_seq(__u32
*ts
, int *cpu
)
44 *ts
= get_cpu_var(proc_event_counts
)++;
45 *cpu
= smp_processor_id();
46 put_cpu_var(proc_event_counts
);
49 void proc_fork_connector(struct task_struct
*task
)
52 struct proc_event
*ev
;
53 __u8 buffer
[CN_PROC_MSG_SIZE
];
55 if (atomic_read(&proc_event_num_listeners
) < 1)
58 msg
= (struct cn_msg
*)buffer
;
59 ev
= (struct proc_event
*)msg
->data
;
60 get_seq(&msg
->seq
, &ev
->cpu
);
61 ktime_get_ts(&ev
->timestamp
); /* get high res monotonic timestamp */
62 ev
->what
= PROC_EVENT_FORK
;
63 ev
->event_data
.fork
.parent_pid
= task
->real_parent
->pid
;
64 ev
->event_data
.fork
.parent_tgid
= task
->real_parent
->tgid
;
65 ev
->event_data
.fork
.child_pid
= task
->pid
;
66 ev
->event_data
.fork
.child_tgid
= task
->tgid
;
68 memcpy(&msg
->id
, &cn_proc_event_id
, sizeof(msg
->id
));
69 msg
->ack
= 0; /* not used */
70 msg
->len
= sizeof(*ev
);
71 /* If cn_netlink_send() failed, the data is not sent */
72 cn_netlink_send(msg
, CN_IDX_PROC
, GFP_KERNEL
);
75 void proc_exec_connector(struct task_struct
*task
)
78 struct proc_event
*ev
;
79 __u8 buffer
[CN_PROC_MSG_SIZE
];
81 if (atomic_read(&proc_event_num_listeners
) < 1)
84 msg
= (struct cn_msg
*)buffer
;
85 ev
= (struct proc_event
*)msg
->data
;
86 get_seq(&msg
->seq
, &ev
->cpu
);
87 ktime_get_ts(&ev
->timestamp
);
88 ev
->what
= PROC_EVENT_EXEC
;
89 ev
->event_data
.exec
.process_pid
= task
->pid
;
90 ev
->event_data
.exec
.process_tgid
= task
->tgid
;
92 memcpy(&msg
->id
, &cn_proc_event_id
, sizeof(msg
->id
));
93 msg
->ack
= 0; /* not used */
94 msg
->len
= sizeof(*ev
);
95 cn_netlink_send(msg
, CN_IDX_PROC
, GFP_KERNEL
);
98 void proc_id_connector(struct task_struct
*task
, int which_id
)
101 struct proc_event
*ev
;
102 __u8 buffer
[CN_PROC_MSG_SIZE
];
104 if (atomic_read(&proc_event_num_listeners
) < 1)
107 msg
= (struct cn_msg
*)buffer
;
108 ev
= (struct proc_event
*)msg
->data
;
110 ev
->event_data
.id
.process_pid
= task
->pid
;
111 ev
->event_data
.id
.process_tgid
= task
->tgid
;
112 if (which_id
== PROC_EVENT_UID
) {
113 ev
->event_data
.id
.r
.ruid
= task
->uid
;
114 ev
->event_data
.id
.e
.euid
= task
->euid
;
115 } else if (which_id
== PROC_EVENT_GID
) {
116 ev
->event_data
.id
.r
.rgid
= task
->gid
;
117 ev
->event_data
.id
.e
.egid
= task
->egid
;
120 get_seq(&msg
->seq
, &ev
->cpu
);
121 ktime_get_ts(&ev
->timestamp
);
123 memcpy(&msg
->id
, &cn_proc_event_id
, sizeof(msg
->id
));
124 msg
->ack
= 0; /* not used */
125 msg
->len
= sizeof(*ev
);
126 cn_netlink_send(msg
, CN_IDX_PROC
, GFP_KERNEL
);
129 void proc_exit_connector(struct task_struct
*task
)
132 struct proc_event
*ev
;
133 __u8 buffer
[CN_PROC_MSG_SIZE
];
135 if (atomic_read(&proc_event_num_listeners
) < 1)
138 msg
= (struct cn_msg
*)buffer
;
139 ev
= (struct proc_event
*)msg
->data
;
140 get_seq(&msg
->seq
, &ev
->cpu
);
141 ktime_get_ts(&ev
->timestamp
);
142 ev
->what
= PROC_EVENT_EXIT
;
143 ev
->event_data
.exit
.process_pid
= task
->pid
;
144 ev
->event_data
.exit
.process_tgid
= task
->tgid
;
145 ev
->event_data
.exit
.exit_code
= task
->exit_code
;
146 ev
->event_data
.exit
.exit_signal
= task
->exit_signal
;
148 memcpy(&msg
->id
, &cn_proc_event_id
, sizeof(msg
->id
));
149 msg
->ack
= 0; /* not used */
150 msg
->len
= sizeof(*ev
);
151 cn_netlink_send(msg
, CN_IDX_PROC
, GFP_KERNEL
);
155 * Send an acknowledgement message to userspace
157 * Use 0 for success, EFOO otherwise.
158 * Note: this is the negative of conventional kernel error
159 * values because it's not being returned via syscall return
162 static void cn_proc_ack(int err
, int rcvd_seq
, int rcvd_ack
)
165 struct proc_event
*ev
;
166 __u8 buffer
[CN_PROC_MSG_SIZE
];
168 if (atomic_read(&proc_event_num_listeners
) < 1)
171 msg
= (struct cn_msg
*)buffer
;
172 ev
= (struct proc_event
*)msg
->data
;
174 ktime_get_ts(&ev
->timestamp
);
176 ev
->what
= PROC_EVENT_NONE
;
177 ev
->event_data
.ack
.err
= err
;
178 memcpy(&msg
->id
, &cn_proc_event_id
, sizeof(msg
->id
));
179 msg
->ack
= rcvd_ack
+ 1;
180 msg
->len
= sizeof(*ev
);
181 cn_netlink_send(msg
, CN_IDX_PROC
, GFP_KERNEL
);
186 * @data: message sent from userspace via the connector
188 static void cn_proc_mcast_ctl(void *data
)
190 struct cn_msg
*msg
= data
;
191 enum proc_cn_mcast_op
*mc_op
= NULL
;
194 if (msg
->len
!= sizeof(*mc_op
))
197 mc_op
= (enum proc_cn_mcast_op
*)msg
->data
;
199 case PROC_CN_MCAST_LISTEN
:
200 atomic_inc(&proc_event_num_listeners
);
202 case PROC_CN_MCAST_IGNORE
:
203 atomic_dec(&proc_event_num_listeners
);
209 cn_proc_ack(err
, msg
->seq
, msg
->ack
);
213 * cn_proc_init - initialization entry point
215 * Adds the connector callback to the connector driver.
217 static int __init
cn_proc_init(void)
221 if ((err
= cn_add_callback(&cn_proc_event_id
, "cn_proc",
222 &cn_proc_mcast_ctl
))) {
223 printk(KERN_WARNING
"cn_proc failed to register\n");
229 module_init(cn_proc_init
);