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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> |
9f46080c MH |
30 | #include <asm/atomic.h> |
31 | ||
32 | #include <linux/cn_proc.h> | |
33 | ||
34 | #define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event)) | |
35 | ||
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 }; | |
38 | ||
cc398c2e | 39 | /* proc_event_counts is used as the sequence number of the netlink message */ |
9f46080c MH |
40 | static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; |
41 | ||
42 | static inline void get_seq(__u32 *ts, int *cpu) | |
43 | { | |
44 | *ts = get_cpu_var(proc_event_counts)++; | |
45 | *cpu = smp_processor_id(); | |
cc398c2e | 46 | put_cpu_var(proc_event_counts); |
9f46080c MH |
47 | } |
48 | ||
49 | void proc_fork_connector(struct task_struct *task) | |
50 | { | |
51 | struct cn_msg *msg; | |
52 | struct proc_event *ev; | |
53 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 54 | struct timespec ts; |
9f46080c MH |
55 | |
56 | if (atomic_read(&proc_event_num_listeners) < 1) | |
57 | return; | |
58 | ||
59 | msg = (struct cn_msg*)buffer; | |
60 | ev = (struct proc_event*)msg->data; | |
61 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff CS |
62 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
63 | ev->timestamp_ns = timespec_to_ns(&ts); | |
9f46080c MH |
64 | ev->what = PROC_EVENT_FORK; |
65 | ev->event_data.fork.parent_pid = task->real_parent->pid; | |
66 | ev->event_data.fork.parent_tgid = task->real_parent->tgid; | |
67 | ev->event_data.fork.child_pid = task->pid; | |
68 | ev->event_data.fork.child_tgid = task->tgid; | |
69 | ||
70 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
71 | msg->ack = 0; /* not used */ | |
72 | msg->len = sizeof(*ev); | |
73 | /* If cn_netlink_send() failed, the data is not sent */ | |
74 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
75 | } | |
76 | ||
77 | void proc_exec_connector(struct task_struct *task) | |
78 | { | |
79 | struct cn_msg *msg; | |
80 | struct proc_event *ev; | |
822cfbff | 81 | struct timespec ts; |
9f46080c MH |
82 | __u8 buffer[CN_PROC_MSG_SIZE]; |
83 | ||
84 | if (atomic_read(&proc_event_num_listeners) < 1) | |
85 | return; | |
86 | ||
87 | msg = (struct cn_msg*)buffer; | |
88 | ev = (struct proc_event*)msg->data; | |
89 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff CS |
90 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
91 | ev->timestamp_ns = timespec_to_ns(&ts); | |
9f46080c MH |
92 | ev->what = PROC_EVENT_EXEC; |
93 | ev->event_data.exec.process_pid = task->pid; | |
94 | ev->event_data.exec.process_tgid = task->tgid; | |
95 | ||
96 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
97 | msg->ack = 0; /* not used */ | |
98 | msg->len = sizeof(*ev); | |
99 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
100 | } | |
101 | ||
102 | void proc_id_connector(struct task_struct *task, int which_id) | |
103 | { | |
104 | struct cn_msg *msg; | |
105 | struct proc_event *ev; | |
106 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 107 | struct timespec ts; |
9f46080c MH |
108 | |
109 | if (atomic_read(&proc_event_num_listeners) < 1) | |
110 | return; | |
111 | ||
112 | msg = (struct cn_msg*)buffer; | |
113 | ev = (struct proc_event*)msg->data; | |
114 | ev->what = which_id; | |
115 | ev->event_data.id.process_pid = task->pid; | |
116 | ev->event_data.id.process_tgid = task->tgid; | |
117 | if (which_id == PROC_EVENT_UID) { | |
118 | ev->event_data.id.r.ruid = task->uid; | |
119 | ev->event_data.id.e.euid = task->euid; | |
120 | } else if (which_id == PROC_EVENT_GID) { | |
121 | ev->event_data.id.r.rgid = task->gid; | |
122 | ev->event_data.id.e.egid = task->egid; | |
123 | } else | |
124 | return; | |
125 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff CS |
126 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
127 | ev->timestamp_ns = timespec_to_ns(&ts); | |
9f46080c MH |
128 | |
129 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
130 | msg->ack = 0; /* not used */ | |
131 | msg->len = sizeof(*ev); | |
132 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
133 | } | |
134 | ||
135 | void proc_exit_connector(struct task_struct *task) | |
136 | { | |
137 | struct cn_msg *msg; | |
138 | struct proc_event *ev; | |
139 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 140 | struct timespec ts; |
9f46080c MH |
141 | |
142 | if (atomic_read(&proc_event_num_listeners) < 1) | |
143 | return; | |
144 | ||
145 | msg = (struct cn_msg*)buffer; | |
146 | ev = (struct proc_event*)msg->data; | |
147 | get_seq(&msg->seq, &ev->cpu); | |
822cfbff CS |
148 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
149 | ev->timestamp_ns = timespec_to_ns(&ts); | |
9f46080c MH |
150 | ev->what = PROC_EVENT_EXIT; |
151 | ev->event_data.exit.process_pid = task->pid; | |
152 | ev->event_data.exit.process_tgid = task->tgid; | |
153 | ev->event_data.exit.exit_code = task->exit_code; | |
154 | ev->event_data.exit.exit_signal = task->exit_signal; | |
155 | ||
156 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
157 | msg->ack = 0; /* not used */ | |
158 | msg->len = sizeof(*ev); | |
159 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
160 | } | |
161 | ||
162 | /* | |
163 | * Send an acknowledgement message to userspace | |
164 | * | |
165 | * Use 0 for success, EFOO otherwise. | |
166 | * Note: this is the negative of conventional kernel error | |
167 | * values because it's not being returned via syscall return | |
168 | * mechanisms. | |
169 | */ | |
170 | static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) | |
171 | { | |
172 | struct cn_msg *msg; | |
173 | struct proc_event *ev; | |
174 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
822cfbff | 175 | struct timespec ts; |
9f46080c MH |
176 | |
177 | if (atomic_read(&proc_event_num_listeners) < 1) | |
178 | return; | |
179 | ||
180 | msg = (struct cn_msg*)buffer; | |
181 | ev = (struct proc_event*)msg->data; | |
182 | msg->seq = rcvd_seq; | |
822cfbff CS |
183 | ktime_get_ts(&ts); /* get high res monotonic timestamp */ |
184 | ev->timestamp_ns = timespec_to_ns(&ts); | |
9f46080c MH |
185 | ev->cpu = -1; |
186 | ev->what = PROC_EVENT_NONE; | |
187 | ev->event_data.ack.err = err; | |
188 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
189 | msg->ack = rcvd_ack + 1; | |
190 | msg->len = sizeof(*ev); | |
191 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
192 | } | |
193 | ||
194 | /** | |
195 | * cn_proc_mcast_ctl | |
196 | * @data: message sent from userspace via the connector | |
197 | */ | |
198 | static void cn_proc_mcast_ctl(void *data) | |
199 | { | |
200 | struct cn_msg *msg = data; | |
201 | enum proc_cn_mcast_op *mc_op = NULL; | |
202 | int err = 0; | |
203 | ||
204 | if (msg->len != sizeof(*mc_op)) | |
205 | return; | |
206 | ||
207 | mc_op = (enum proc_cn_mcast_op*)msg->data; | |
208 | switch (*mc_op) { | |
209 | case PROC_CN_MCAST_LISTEN: | |
210 | atomic_inc(&proc_event_num_listeners); | |
211 | break; | |
212 | case PROC_CN_MCAST_IGNORE: | |
213 | atomic_dec(&proc_event_num_listeners); | |
214 | break; | |
215 | default: | |
216 | err = EINVAL; | |
217 | break; | |
218 | } | |
219 | cn_proc_ack(err, msg->seq, msg->ack); | |
220 | } | |
221 | ||
222 | /* | |
223 | * cn_proc_init - initialization entry point | |
224 | * | |
225 | * Adds the connector callback to the connector driver. | |
226 | */ | |
227 | static int __init cn_proc_init(void) | |
228 | { | |
229 | int err; | |
230 | ||
231 | if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc", | |
232 | &cn_proc_mcast_ctl))) { | |
233 | printk(KERN_WARNING "cn_proc failed to register\n"); | |
234 | return err; | |
235 | } | |
236 | return 0; | |
237 | } | |
238 | ||
239 | module_init(cn_proc_init); |