1/* SCTP kernel reference Implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 *
4 * This file is part of the SCTP kernel reference 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 * The SCTP reference 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 * The SCTP reference 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, write to
24 * the Free Software Foundation, 59 Temple Place - Suite 330,
25 * Boston, MA 02111-1307, USA.
26 *
27 * Please send any bug reports or fixes you make to the
28 * email address(es):
29 *    lksctp developers <lksctp-developers@lists.sourceforge.net>
30 *
31 * Or submit a bug report through the following website:
32 *    http://www.sf.net/projects/lksctp
33 *
34 * Written or modified by:
35 *    Jon Grimm             <jgrimm@us.ibm.com>
36 *
37 * Any bugs reported given to us we will try to fix... any fixes shared will
38 * be incorporated into the next SCTP release.
39 */
40
41#include <linux/kernel.h>
42#include <net/sctp/sctp.h>
43
44/*
45 * Global counters to count raw object allocation counts.
46 * To add new counters, choose a unique suffix for the variable
47 * name as the helper macros key off this suffix to make
48 * life easier for the programmer.
49 */
50
51SCTP_DBG_OBJCNT(sock);
52SCTP_DBG_OBJCNT(ep);
53SCTP_DBG_OBJCNT(transport);
54SCTP_DBG_OBJCNT(assoc);
55SCTP_DBG_OBJCNT(bind_addr);
56SCTP_DBG_OBJCNT(bind_bucket);
57SCTP_DBG_OBJCNT(chunk);
58SCTP_DBG_OBJCNT(addr);
59SCTP_DBG_OBJCNT(ssnmap);
60SCTP_DBG_OBJCNT(datamsg);
61
62/* An array to make it easy to pretty print the debug information
63 * to the proc fs.
64 */
65static sctp_dbg_objcnt_entry_t sctp_dbg_objcnt[] = {
66	SCTP_DBG_OBJCNT_ENTRY(sock),
67	SCTP_DBG_OBJCNT_ENTRY(ep),
68	SCTP_DBG_OBJCNT_ENTRY(assoc),
69	SCTP_DBG_OBJCNT_ENTRY(transport),
70	SCTP_DBG_OBJCNT_ENTRY(chunk),
71	SCTP_DBG_OBJCNT_ENTRY(bind_addr),
72	SCTP_DBG_OBJCNT_ENTRY(bind_bucket),
73	SCTP_DBG_OBJCNT_ENTRY(addr),
74	SCTP_DBG_OBJCNT_ENTRY(ssnmap),
75	SCTP_DBG_OBJCNT_ENTRY(datamsg),
76};
77
78/* Callback from procfs to read out objcount information.
79 * Walk through the entries in the sctp_dbg_objcnt array, dumping
80 * the raw object counts for each monitored type.
81 *
82 * This code was modified from similar code in route.c
83 */
84static int sctp_dbg_objcnt_read(char *buffer, char **start, off_t offset,
85				int length, int *eof, void *data)
86{
87	int len = 0;
88	off_t pos = 0;
89	int entries;
90	int i;
91	char temp[128];
92
93	/* How many entries? */
94	entries = ARRAY_SIZE(sctp_dbg_objcnt);
95
96	/* Walk the entries and print out the debug information
97	 * for proc fs.
98	 */
99	for (i = 0; i < entries; i++) {
100		pos += 128;
101
102		/* Skip ahead. */
103		if (pos <= offset) {
104			len = 0;
105			continue;
106		}
107		/* Print out each entry. */
108		sprintf(temp, "%s: %d",
109			sctp_dbg_objcnt[i].label,
110			atomic_read(sctp_dbg_objcnt[i].counter));
111
112		sprintf(buffer + len, "%-127s\n", temp);
113		len += 128;
114		if (pos >= offset+length)
115			goto done;
116	}
117
118done:
119	*start = buffer + len - (pos - offset);
120	len = pos - offset;
121	if (len > length)
122		len = length;
123
124	return len;
125}
126
127/* Initialize the objcount in the proc filesystem.  */
128void sctp_dbg_objcnt_init(void)
129{
130	struct proc_dir_entry *ent;
131	ent = create_proc_read_entry("sctp_dbg_objcnt", 0, proc_net_sctp,
132			       sctp_dbg_objcnt_read, NULL);
133	if (!ent)
134		printk(KERN_WARNING
135			"sctp_dbg_objcnt: Unable to create /proc entry.\n");
136}
137
138/* Cleanup the objcount entry in the proc filesystem.  */
139void sctp_dbg_objcnt_exit(void)
140{
141	remove_proc_entry("sctp_dbg_objcnt", proc_net_sctp);
142}
143