1/* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 *
4 * This file is part of the SCTP kernel implementation
5 *
6 * Support for memory object debugging.  This allows one to monitor the
7 * object allocations/deallocations for types instrumented for this
8 * via the proc fs.
9 *
10 * This SCTP implementation is free software;
11 * you can redistribute it and/or modify it under the terms of
12 * the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This SCTP implementation is distributed in the hope that it
17 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
18 *                 ************************
19 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
20 * See the GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with GNU CC; see the file COPYING.  If not, see
24 * <http://www.gnu.org/licenses/>.
25 *
26 * Please send any bug reports or fixes you make to the
27 * email address(es):
28 *    lksctp developers <linux-sctp@vger.kernel.org>
29 *
30 * Written or modified by:
31 *    Jon Grimm             <jgrimm@us.ibm.com>
32 */
33
34#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35
36#include <linux/kernel.h>
37#include <net/sctp/sctp.h>
38
39/*
40 * Global counters to count raw object allocation counts.
41 * To add new counters, choose a unique suffix for the variable
42 * name as the helper macros key off this suffix to make
43 * life easier for the programmer.
44 */
45
46SCTP_DBG_OBJCNT(sock);
47SCTP_DBG_OBJCNT(ep);
48SCTP_DBG_OBJCNT(transport);
49SCTP_DBG_OBJCNT(assoc);
50SCTP_DBG_OBJCNT(bind_addr);
51SCTP_DBG_OBJCNT(bind_bucket);
52SCTP_DBG_OBJCNT(chunk);
53SCTP_DBG_OBJCNT(addr);
54SCTP_DBG_OBJCNT(ssnmap);
55SCTP_DBG_OBJCNT(datamsg);
56SCTP_DBG_OBJCNT(keys);
57
58/* An array to make it easy to pretty print the debug information
59 * to the proc fs.
60 */
61static sctp_dbg_objcnt_entry_t sctp_dbg_objcnt[] = {
62	SCTP_DBG_OBJCNT_ENTRY(sock),
63	SCTP_DBG_OBJCNT_ENTRY(ep),
64	SCTP_DBG_OBJCNT_ENTRY(assoc),
65	SCTP_DBG_OBJCNT_ENTRY(transport),
66	SCTP_DBG_OBJCNT_ENTRY(chunk),
67	SCTP_DBG_OBJCNT_ENTRY(bind_addr),
68	SCTP_DBG_OBJCNT_ENTRY(bind_bucket),
69	SCTP_DBG_OBJCNT_ENTRY(addr),
70	SCTP_DBG_OBJCNT_ENTRY(ssnmap),
71	SCTP_DBG_OBJCNT_ENTRY(datamsg),
72	SCTP_DBG_OBJCNT_ENTRY(keys),
73};
74
75/* Callback from procfs to read out objcount information.
76 * Walk through the entries in the sctp_dbg_objcnt array, dumping
77 * the raw object counts for each monitored type.
78 */
79static int sctp_objcnt_seq_show(struct seq_file *seq, void *v)
80{
81	int i;
82
83	i = (int)*(loff_t *)v;
84	seq_setwidth(seq, 127);
85	seq_printf(seq, "%s: %d", sctp_dbg_objcnt[i].label,
86				atomic_read(sctp_dbg_objcnt[i].counter));
87	seq_pad(seq, '\n');
88	return 0;
89}
90
91static void *sctp_objcnt_seq_start(struct seq_file *seq, loff_t *pos)
92{
93	return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
94}
95
96static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v)
97{
98}
99
100static void *sctp_objcnt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
101{
102	++*pos;
103	return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
104}
105
106static const struct seq_operations sctp_objcnt_seq_ops = {
107	.start = sctp_objcnt_seq_start,
108	.next  = sctp_objcnt_seq_next,
109	.stop  = sctp_objcnt_seq_stop,
110	.show  = sctp_objcnt_seq_show,
111};
112
113static int sctp_objcnt_seq_open(struct inode *inode, struct file *file)
114{
115	return seq_open(file, &sctp_objcnt_seq_ops);
116}
117
118static const struct file_operations sctp_objcnt_ops = {
119	.open	 = sctp_objcnt_seq_open,
120	.read	 = seq_read,
121	.llseek	 = seq_lseek,
122	.release = seq_release,
123};
124
125/* Initialize the objcount in the proc filesystem.  */
126void sctp_dbg_objcnt_init(struct net *net)
127{
128	struct proc_dir_entry *ent;
129
130	ent = proc_create("sctp_dbg_objcnt", 0,
131			  net->sctp.proc_net_sctp, &sctp_objcnt_ops);
132	if (!ent)
133		pr_warn("sctp_dbg_objcnt: Unable to create /proc entry.\n");
134}
135
136/* Cleanup the objcount entry in the proc filesystem.  */
137void sctp_dbg_objcnt_exit(struct net *net)
138{
139	remove_proc_entry("sctp_dbg_objcnt", net->sctp.proc_net_sctp);
140}
141
142
143