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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 MH |
28 | #include <linux/init.h> |
29 | #include <asm/atomic.h> | |
30 | ||
31 | #include <linux/cn_proc.h> | |
32 | ||
33 | #define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event)) | |
34 | ||
35 | static atomic_t proc_event_num_listeners = ATOMIC_INIT(0); | |
36 | static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC }; | |
37 | ||
cc398c2e | 38 | /* proc_event_counts is used as the sequence number of the netlink message */ |
9f46080c MH |
39 | static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; |
40 | ||
41 | static inline void get_seq(__u32 *ts, int *cpu) | |
42 | { | |
43 | *ts = get_cpu_var(proc_event_counts)++; | |
44 | *cpu = smp_processor_id(); | |
cc398c2e | 45 | put_cpu_var(proc_event_counts); |
9f46080c MH |
46 | } |
47 | ||
48 | void proc_fork_connector(struct task_struct *task) | |
49 | { | |
50 | struct cn_msg *msg; | |
51 | struct proc_event *ev; | |
52 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
53 | ||
54 | if (atomic_read(&proc_event_num_listeners) < 1) | |
55 | return; | |
56 | ||
57 | msg = (struct cn_msg*)buffer; | |
58 | ev = (struct proc_event*)msg->data; | |
59 | get_seq(&msg->seq, &ev->cpu); | |
caf3c9dc | 60 | ktime_get_ts(&ev->timestamp); /* get high res monotonic timestamp */ |
9f46080c MH |
61 | ev->what = PROC_EVENT_FORK; |
62 | ev->event_data.fork.parent_pid = task->real_parent->pid; | |
63 | ev->event_data.fork.parent_tgid = task->real_parent->tgid; | |
64 | ev->event_data.fork.child_pid = task->pid; | |
65 | ev->event_data.fork.child_tgid = task->tgid; | |
66 | ||
67 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
68 | msg->ack = 0; /* not used */ | |
69 | msg->len = sizeof(*ev); | |
70 | /* If cn_netlink_send() failed, the data is not sent */ | |
71 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
72 | } | |
73 | ||
74 | void proc_exec_connector(struct task_struct *task) | |
75 | { | |
76 | struct cn_msg *msg; | |
77 | struct proc_event *ev; | |
78 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
79 | ||
80 | if (atomic_read(&proc_event_num_listeners) < 1) | |
81 | return; | |
82 | ||
83 | msg = (struct cn_msg*)buffer; | |
84 | ev = (struct proc_event*)msg->data; | |
85 | get_seq(&msg->seq, &ev->cpu); | |
caf3c9dc | 86 | ktime_get_ts(&ev->timestamp); |
9f46080c MH |
87 | ev->what = PROC_EVENT_EXEC; |
88 | ev->event_data.exec.process_pid = task->pid; | |
89 | ev->event_data.exec.process_tgid = task->tgid; | |
90 | ||
91 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
92 | msg->ack = 0; /* not used */ | |
93 | msg->len = sizeof(*ev); | |
94 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
95 | } | |
96 | ||
97 | void proc_id_connector(struct task_struct *task, int which_id) | |
98 | { | |
99 | struct cn_msg *msg; | |
100 | struct proc_event *ev; | |
101 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
102 | ||
103 | if (atomic_read(&proc_event_num_listeners) < 1) | |
104 | return; | |
105 | ||
106 | msg = (struct cn_msg*)buffer; | |
107 | ev = (struct proc_event*)msg->data; | |
108 | ev->what = which_id; | |
109 | ev->event_data.id.process_pid = task->pid; | |
110 | ev->event_data.id.process_tgid = task->tgid; | |
111 | if (which_id == PROC_EVENT_UID) { | |
112 | ev->event_data.id.r.ruid = task->uid; | |
113 | ev->event_data.id.e.euid = task->euid; | |
114 | } else if (which_id == PROC_EVENT_GID) { | |
115 | ev->event_data.id.r.rgid = task->gid; | |
116 | ev->event_data.id.e.egid = task->egid; | |
117 | } else | |
118 | return; | |
119 | get_seq(&msg->seq, &ev->cpu); | |
caf3c9dc | 120 | ktime_get_ts(&ev->timestamp); |
9f46080c MH |
121 | |
122 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
123 | msg->ack = 0; /* not used */ | |
124 | msg->len = sizeof(*ev); | |
125 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
126 | } | |
127 | ||
128 | void proc_exit_connector(struct task_struct *task) | |
129 | { | |
130 | struct cn_msg *msg; | |
131 | struct proc_event *ev; | |
132 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
133 | ||
134 | if (atomic_read(&proc_event_num_listeners) < 1) | |
135 | return; | |
136 | ||
137 | msg = (struct cn_msg*)buffer; | |
138 | ev = (struct proc_event*)msg->data; | |
139 | get_seq(&msg->seq, &ev->cpu); | |
caf3c9dc | 140 | ktime_get_ts(&ev->timestamp); |
9f46080c MH |
141 | ev->what = PROC_EVENT_EXIT; |
142 | ev->event_data.exit.process_pid = task->pid; | |
143 | ev->event_data.exit.process_tgid = task->tgid; | |
144 | ev->event_data.exit.exit_code = task->exit_code; | |
145 | ev->event_data.exit.exit_signal = task->exit_signal; | |
146 | ||
147 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
148 | msg->ack = 0; /* not used */ | |
149 | msg->len = sizeof(*ev); | |
150 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
151 | } | |
152 | ||
153 | /* | |
154 | * Send an acknowledgement message to userspace | |
155 | * | |
156 | * Use 0 for success, EFOO otherwise. | |
157 | * Note: this is the negative of conventional kernel error | |
158 | * values because it's not being returned via syscall return | |
159 | * mechanisms. | |
160 | */ | |
161 | static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) | |
162 | { | |
163 | struct cn_msg *msg; | |
164 | struct proc_event *ev; | |
165 | __u8 buffer[CN_PROC_MSG_SIZE]; | |
166 | ||
167 | if (atomic_read(&proc_event_num_listeners) < 1) | |
168 | return; | |
169 | ||
170 | msg = (struct cn_msg*)buffer; | |
171 | ev = (struct proc_event*)msg->data; | |
172 | msg->seq = rcvd_seq; | |
caf3c9dc | 173 | ktime_get_ts(&ev->timestamp); |
9f46080c MH |
174 | ev->cpu = -1; |
175 | ev->what = PROC_EVENT_NONE; | |
176 | ev->event_data.ack.err = err; | |
177 | memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); | |
178 | msg->ack = rcvd_ack + 1; | |
179 | msg->len = sizeof(*ev); | |
180 | cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); | |
181 | } | |
182 | ||
183 | /** | |
184 | * cn_proc_mcast_ctl | |
185 | * @data: message sent from userspace via the connector | |
186 | */ | |
187 | static void cn_proc_mcast_ctl(void *data) | |
188 | { | |
189 | struct cn_msg *msg = data; | |
190 | enum proc_cn_mcast_op *mc_op = NULL; | |
191 | int err = 0; | |
192 | ||
193 | if (msg->len != sizeof(*mc_op)) | |
194 | return; | |
195 | ||
196 | mc_op = (enum proc_cn_mcast_op*)msg->data; | |
197 | switch (*mc_op) { | |
198 | case PROC_CN_MCAST_LISTEN: | |
199 | atomic_inc(&proc_event_num_listeners); | |
200 | break; | |
201 | case PROC_CN_MCAST_IGNORE: | |
202 | atomic_dec(&proc_event_num_listeners); | |
203 | break; | |
204 | default: | |
205 | err = EINVAL; | |
206 | break; | |
207 | } | |
208 | cn_proc_ack(err, msg->seq, msg->ack); | |
209 | } | |
210 | ||
211 | /* | |
212 | * cn_proc_init - initialization entry point | |
213 | * | |
214 | * Adds the connector callback to the connector driver. | |
215 | */ | |
216 | static int __init cn_proc_init(void) | |
217 | { | |
218 | int err; | |
219 | ||
220 | if ((err = cn_add_callback(&cn_proc_event_id, "cn_proc", | |
221 | &cn_proc_mcast_ctl))) { | |
222 | printk(KERN_WARNING "cn_proc failed to register\n"); | |
223 | return err; | |
224 | } | |
225 | return 0; | |
226 | } | |
227 | ||
228 | module_init(cn_proc_init); |