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-rw-r--r--drivers/connector/cn_proc.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
new file mode 100644
index 000000000000..fcdf0fff13a6
--- /dev/null
+++ b/drivers/connector/cn_proc.c
@@ -0,0 +1,222 @@
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>
27#include <linux/init.h>
28#include <asm/atomic.h>
29
30#include <linux/cn_proc.h>
31
32#define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event))
33
34static atomic_t proc_event_num_listeners = ATOMIC_INIT(0);
35static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC };
36
37/* proc_counts is used as the sequence number of the netlink message */
38static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 };
39
40static inline void get_seq(__u32 *ts, int *cpu)
41{
42 *ts = get_cpu_var(proc_event_counts)++;
43 *cpu = smp_processor_id();
44 put_cpu_var(proc_counts);
45}
46
47void proc_fork_connector(struct task_struct *task)
48{
49 struct cn_msg *msg;
50 struct proc_event *ev;
51 __u8 buffer[CN_PROC_MSG_SIZE];
52
53 if (atomic_read(&proc_event_num_listeners) < 1)
54 return;
55
56 msg = (struct cn_msg*)buffer;
57 ev = (struct proc_event*)msg->data;
58 get_seq(&msg->seq, &ev->cpu);
59 ev->what = PROC_EVENT_FORK;
60 ev->event_data.fork.parent_pid = task->real_parent->pid;
61 ev->event_data.fork.parent_tgid = task->real_parent->tgid;
62 ev->event_data.fork.child_pid = task->pid;
63 ev->event_data.fork.child_tgid = task->tgid;
64
65 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
66 msg->ack = 0; /* not used */
67 msg->len = sizeof(*ev);
68 /* If cn_netlink_send() failed, the data is not sent */
69 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
70}
71
72void proc_exec_connector(struct task_struct *task)
73{
74 struct cn_msg *msg;
75 struct proc_event *ev;
76 __u8 buffer[CN_PROC_MSG_SIZE];
77
78 if (atomic_read(&proc_event_num_listeners) < 1)
79 return;
80
81 msg = (struct cn_msg*)buffer;
82 ev = (struct proc_event*)msg->data;
83 get_seq(&msg->seq, &ev->cpu);
84 ev->what = PROC_EVENT_EXEC;
85 ev->event_data.exec.process_pid = task->pid;
86 ev->event_data.exec.process_tgid = task->tgid;
87
88 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
89 msg->ack = 0; /* not used */
90 msg->len = sizeof(*ev);
91 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
92}
93
94void proc_id_connector(struct task_struct *task, int which_id)
95{
96 struct cn_msg *msg;
97 struct proc_event *ev;
98 __u8 buffer[CN_PROC_MSG_SIZE];
99
100 if (atomic_read(&proc_event_num_listeners) < 1)
101 return;
102
103 msg = (struct cn_msg*)buffer;
104 ev = (struct proc_event*)msg->data;
105 ev->what = which_id;
106 ev->event_data.id.process_pid = task->pid;
107 ev->event_data.id.process_tgid = task->tgid;
108 if (which_id == PROC_EVENT_UID) {
109 ev->event_data.id.r.ruid = task->uid;
110 ev->event_data.id.e.euid = task->euid;
111 } else if (which_id == PROC_EVENT_GID) {
112 ev->event_data.id.r.rgid = task->gid;
113 ev->event_data.id.e.egid = task->egid;
114 } else
115 return;
116 get_seq(&msg->seq, &ev->cpu);
117
118 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
119 msg->ack = 0; /* not used */
120 msg->len = sizeof(*ev);
121 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
122}
123
124void proc_exit_connector(struct task_struct *task)
125{
126 struct cn_msg *msg;
127 struct proc_event *ev;
128 __u8 buffer[CN_PROC_MSG_SIZE];
129
130 if (atomic_read(&proc_event_num_listeners) < 1)
131 return;
132
133 msg = (struct cn_msg*)buffer;
134 ev = (struct proc_event*)msg->data;
135 get_seq(&msg->seq, &ev->cpu);
136 ev->what = PROC_EVENT_EXIT;
137 ev->event_data.exit.process_pid = task->pid;
138 ev->event_data.exit.process_tgid = task->tgid;
139 ev->event_data.exit.exit_code = task->exit_code;
140 ev->event_data.exit.exit_signal = task->exit_signal;
141
142 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
143 msg->ack = 0; /* not used */
144 msg->len = sizeof(*ev);
145 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
146}
147
148/*
149 * Send an acknowledgement message to userspace
150 *
151 * Use 0 for success, EFOO otherwise.
152 * Note: this is the negative of conventional kernel error
153 * values because it's not being returned via syscall return
154 * mechanisms.
155 */
156static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
157{
158 struct cn_msg *msg;
159 struct proc_event *ev;
160 __u8 buffer[CN_PROC_MSG_SIZE];
161
162 if (atomic_read(&proc_event_num_listeners) < 1)
163 return;
164
165 msg = (struct cn_msg*)buffer;
166 ev = (struct proc_event*)msg->data;
167 msg->seq = rcvd_seq;
168 ev->cpu = -1;
169 ev->what = PROC_EVENT_NONE;
170 ev->event_data.ack.err = err;
171 memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id));
172 msg->ack = rcvd_ack + 1;
173 msg->len = sizeof(*ev);
174 cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
175}
176
177/**
178 * cn_proc_mcast_ctl
179 * @data: message sent from userspace via the connector
180 */
181static void cn_proc_mcast_ctl(void *data)
182{
183 struct cn_msg *msg = data;
184 enum proc_cn_mcast_op *mc_op = NULL;
185 int err = 0;
186
187 if (msg->len != sizeof(*mc_op))
188 return;
189
190 mc_op = (enum proc_cn_mcast_op*)msg->data;
191 switch (*mc_op) {
192 case PROC_CN_MCAST_LISTEN:
193 atomic_inc(&proc_event_num_listeners);
194 break;
195 case PROC_CN_MCAST_IGNORE:
196 atomic_dec(&proc_event_num_listeners);
197 break;
198 default:
199 err = EINVAL;
200 break;
201 }
202 cn_proc_ack(err, msg->seq, msg->ack);
203}
204
205/*
206 * cn_proc_init - initialization entry point
207 *
208 * Adds the connector callback to the connector driver.
209 */
210static int __init cn_proc_init(void)
211{
212 int err;
213
214 if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc",
215 &cn_proc_mcast_ctl))) {
216 printk(KERN_WARNING "cn_proc failed to register\n");
217 return err;
218 }
219 return 0;
220}
221
222module_init(cn_proc_init);