Linux kernel mirror (for testing)
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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, 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 <linux-sctp@vger.kernel.org>
30 *
31 * Written or modified by:
32 * Jon Grimm <jgrimm@us.ibm.com>
33 */
34
35#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
36
37#include <linux/kernel.h>
38#include <net/sctp/sctp.h>
39
40/*
41 * Global counters to count raw object allocation counts.
42 * To add new counters, choose a unique suffix for the variable
43 * name as the helper macros key off this suffix to make
44 * life easier for the programmer.
45 */
46
47SCTP_DBG_OBJCNT(sock);
48SCTP_DBG_OBJCNT(ep);
49SCTP_DBG_OBJCNT(transport);
50SCTP_DBG_OBJCNT(assoc);
51SCTP_DBG_OBJCNT(bind_addr);
52SCTP_DBG_OBJCNT(bind_bucket);
53SCTP_DBG_OBJCNT(chunk);
54SCTP_DBG_OBJCNT(addr);
55SCTP_DBG_OBJCNT(ssnmap);
56SCTP_DBG_OBJCNT(datamsg);
57SCTP_DBG_OBJCNT(keys);
58
59/* An array to make it easy to pretty print the debug information
60 * to the proc fs.
61 */
62static sctp_dbg_objcnt_entry_t sctp_dbg_objcnt[] = {
63 SCTP_DBG_OBJCNT_ENTRY(sock),
64 SCTP_DBG_OBJCNT_ENTRY(ep),
65 SCTP_DBG_OBJCNT_ENTRY(assoc),
66 SCTP_DBG_OBJCNT_ENTRY(transport),
67 SCTP_DBG_OBJCNT_ENTRY(chunk),
68 SCTP_DBG_OBJCNT_ENTRY(bind_addr),
69 SCTP_DBG_OBJCNT_ENTRY(bind_bucket),
70 SCTP_DBG_OBJCNT_ENTRY(addr),
71 SCTP_DBG_OBJCNT_ENTRY(ssnmap),
72 SCTP_DBG_OBJCNT_ENTRY(datamsg),
73 SCTP_DBG_OBJCNT_ENTRY(keys),
74};
75
76/* Callback from procfs to read out objcount information.
77 * Walk through the entries in the sctp_dbg_objcnt array, dumping
78 * the raw object counts for each monitored type.
79 */
80static int sctp_objcnt_seq_show(struct seq_file *seq, void *v)
81{
82 int i, len;
83
84 i = (int)*(loff_t *)v;
85 seq_printf(seq, "%s: %d%n", sctp_dbg_objcnt[i].label,
86 atomic_read(sctp_dbg_objcnt[i].counter), &len);
87 seq_printf(seq, "%*s\n", 127 - len, "");
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