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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> | |
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 | ||
34 | static atomic_t proc_event_num_listeners = ATOMIC_INIT(0); | |
35 | static 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 */ | |
38 | static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; | |
39 | ||
40 | static 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 | ||
47 | void 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); | |
5650b736 | 59 | getnstimestamp(&ev->timestamp); |
9f46080c MH |
60 | ev->what = PROC_EVENT_FORK; |
61 | ev->event_data.fork.parent_pid = task->real_parent->pid; | |
62 | ev->event_data.fork.parent_tgid = task->real_parent->tgid; | |
63 | ev->event_data.fork.child_pid = task->pid; | |
64 | ev->event_data.fork.child_tgid = task->tgid; | |
65 | ||
66 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
67 | msg->ack = 0; /* not used */ | |
68 | msg->len = sizeof(*ev); | |
69 | /* If cn_netlink_send() failed, the data is not sent */ | |
70 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
71 | } | |
72 | ||
73 | void proc_exec_connector(struct task_struct *task) | |
74 | { | |
75 | struct cn_msg *msg; | |
76 | struct proc_event *ev; | |
77 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
78 | ||
79 | if (atomic_read(&proc_event_num_listeners) < 1) | |
80 | return; | |
81 | ||
82 | msg = (struct cn_msg*)buffer; | |
83 | ev = (struct proc_event*)msg->data; | |
84 | get_seq(&msg->seq, &ev->cpu); | |
5650b736 | 85 | getnstimestamp(&ev->timestamp); |
9f46080c MH |
86 | ev->what = PROC_EVENT_EXEC; |
87 | ev->event_data.exec.process_pid = task->pid; | |
88 | ev->event_data.exec.process_tgid = task->tgid; | |
89 | ||
90 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
91 | msg->ack = 0; /* not used */ | |
92 | msg->len = sizeof(*ev); | |
93 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
94 | } | |
95 | ||
96 | void proc_id_connector(struct task_struct *task, int which_id) | |
97 | { | |
98 | struct cn_msg *msg; | |
99 | struct proc_event *ev; | |
100 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
101 | ||
102 | if (atomic_read(&proc_event_num_listeners) < 1) | |
103 | return; | |
104 | ||
105 | msg = (struct cn_msg*)buffer; | |
106 | ev = (struct proc_event*)msg->data; | |
107 | ev->what = which_id; | |
108 | ev->event_data.id.process_pid = task->pid; | |
109 | ev->event_data.id.process_tgid = task->tgid; | |
110 | if (which_id == PROC_EVENT_UID) { | |
111 | ev->event_data.id.r.ruid = task->uid; | |
112 | ev->event_data.id.e.euid = task->euid; | |
113 | } else if (which_id == PROC_EVENT_GID) { | |
114 | ev->event_data.id.r.rgid = task->gid; | |
115 | ev->event_data.id.e.egid = task->egid; | |
116 | } else | |
117 | return; | |
118 | get_seq(&msg->seq, &ev->cpu); | |
5650b736 | 119 | getnstimestamp(&ev->timestamp); |
9f46080c MH |
120 | |
121 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
122 | msg->ack = 0; /* not used */ | |
123 | msg->len = sizeof(*ev); | |
124 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
125 | } | |
126 | ||
127 | void proc_exit_connector(struct task_struct *task) | |
128 | { | |
129 | struct cn_msg *msg; | |
130 | struct proc_event *ev; | |
131 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
132 | ||
133 | if (atomic_read(&proc_event_num_listeners) < 1) | |
134 | return; | |
135 | ||
136 | msg = (struct cn_msg*)buffer; | |
137 | ev = (struct proc_event*)msg->data; | |
138 | get_seq(&msg->seq, &ev->cpu); | |
5650b736 | 139 | getnstimestamp(&ev->timestamp); |
9f46080c MH |
140 | ev->what = PROC_EVENT_EXIT; |
141 | ev->event_data.exit.process_pid = task->pid; | |
142 | ev->event_data.exit.process_tgid = task->tgid; | |
143 | ev->event_data.exit.exit_code = task->exit_code; | |
144 | ev->event_data.exit.exit_signal = task->exit_signal; | |
145 | ||
146 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
147 | msg->ack = 0; /* not used */ | |
148 | msg->len = sizeof(*ev); | |
149 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
150 | } | |
151 | ||
152 | /* | |
153 | * Send an acknowledgement message to userspace | |
154 | * | |
155 | * Use 0 for success, EFOO otherwise. | |
156 | * Note: this is the negative of conventional kernel error | |
157 | * values because it's not being returned via syscall return | |
158 | * mechanisms. | |
159 | */ | |
160 | static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) | |
161 | { | |
162 | struct cn_msg *msg; | |
163 | struct proc_event *ev; | |
164 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
165 | ||
166 | if (atomic_read(&proc_event_num_listeners) < 1) | |
167 | return; | |
168 | ||
169 | msg = (struct cn_msg*)buffer; | |
170 | ev = (struct proc_event*)msg->data; | |
171 | msg->seq = rcvd_seq; | |
5650b736 | 172 | getnstimestamp(&ev->timestamp); |
9f46080c MH |
173 | ev->cpu = -1; |
174 | ev->what = PROC_EVENT_NONE; | |
175 | ev->event_data.ack.err = err; | |
176 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
177 | msg->ack = rcvd_ack + 1; | |
178 | msg->len = sizeof(*ev); | |
179 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
180 | } | |
181 | ||
182 | /** | |
183 | * cn_proc_mcast_ctl | |
184 | * @data: message sent from userspace via the connector | |
185 | */ | |
186 | static void cn_proc_mcast_ctl(void *data) | |
187 | { | |
188 | struct cn_msg *msg = data; | |
189 | enum proc_cn_mcast_op *mc_op = NULL; | |
190 | int err = 0; | |
191 | ||
192 | if (msg->len != sizeof(*mc_op)) | |
193 | return; | |
194 | ||
195 | mc_op = (enum proc_cn_mcast_op*)msg->data; | |
196 | switch (*mc_op) { | |
197 | case PROC_CN_MCAST_LISTEN: | |
198 | atomic_inc(&proc_event_num_listeners); | |
199 | break; | |
200 | case PROC_CN_MCAST_IGNORE: | |
201 | atomic_dec(&proc_event_num_listeners); | |
202 | break; | |
203 | default: | |
204 | err = EINVAL; | |
205 | break; | |
206 | } | |
207 | cn_proc_ack(err, msg->seq, msg->ack); | |
208 | } | |
209 | ||
210 | /* | |
211 | * cn_proc_init - initialization entry point | |
212 | * | |
213 | * Adds the connector callback to the connector driver. | |
214 | */ | |
215 | static int __init cn_proc_init(void) | |
216 | { | |
217 | int err; | |
218 | ||
219 | if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc", | |
220 | &cn_proc_mcast_ctl))) { | |
221 | printk(KERN_WARNING "cn_proc failed to register\n"); | |
222 | return err; | |
223 | } | |
224 | return 0; | |
225 | } | |
226 | ||
227 | module_init(cn_proc_init); |