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
46 SCTP_DBG_OBJCNT(sock);
47 SCTP_DBG_OBJCNT(ep);
48 SCTP_DBG_OBJCNT(transport);
49 SCTP_DBG_OBJCNT(assoc);
50 SCTP_DBG_OBJCNT(bind_addr);
51 SCTP_DBG_OBJCNT(bind_bucket);
52 SCTP_DBG_OBJCNT(chunk);
53 SCTP_DBG_OBJCNT(addr);
54 SCTP_DBG_OBJCNT(datamsg);
55 SCTP_DBG_OBJCNT(keys);
56
57 /* An array to make it easy to pretty print the debug information
58 * to the proc fs.
59 */
60 static struct sctp_dbg_objcnt_entry sctp_dbg_objcnt[] = {
61 SCTP_DBG_OBJCNT_ENTRY(sock),
62 SCTP_DBG_OBJCNT_ENTRY(ep),
63 SCTP_DBG_OBJCNT_ENTRY(assoc),
64 SCTP_DBG_OBJCNT_ENTRY(transport),
65 SCTP_DBG_OBJCNT_ENTRY(chunk),
66 SCTP_DBG_OBJCNT_ENTRY(bind_addr),
67 SCTP_DBG_OBJCNT_ENTRY(bind_bucket),
68 SCTP_DBG_OBJCNT_ENTRY(addr),
69 SCTP_DBG_OBJCNT_ENTRY(datamsg),
70 SCTP_DBG_OBJCNT_ENTRY(keys),
71 };
72
73 /* Callback from procfs to read out objcount information.
74 * Walk through the entries in the sctp_dbg_objcnt array, dumping
75 * the raw object counts for each monitored type.
76 */
sctp_objcnt_seq_show(struct seq_file * seq,void * v)77 static int sctp_objcnt_seq_show(struct seq_file *seq, void *v)
78 {
79 int i;
80
81 i = (int)*(loff_t *)v;
82 seq_setwidth(seq, 127);
83 seq_printf(seq, "%s: %d", sctp_dbg_objcnt[i].label,
84 atomic_read(sctp_dbg_objcnt[i].counter));
85 seq_pad(seq, '\n');
86 return 0;
87 }
88
sctp_objcnt_seq_start(struct seq_file * seq,loff_t * pos)89 static void *sctp_objcnt_seq_start(struct seq_file *seq, loff_t *pos)
90 {
91 return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
92 }
93
sctp_objcnt_seq_stop(struct seq_file * seq,void * v)94 static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v)
95 {
96 }
97
sctp_objcnt_seq_next(struct seq_file * seq,void * v,loff_t * pos)98 static void *sctp_objcnt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
99 {
100 ++*pos;
101 return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
102 }
103
104 static const struct seq_operations sctp_objcnt_seq_ops = {
105 .start = sctp_objcnt_seq_start,
106 .next = sctp_objcnt_seq_next,
107 .stop = sctp_objcnt_seq_stop,
108 .show = sctp_objcnt_seq_show,
109 };
110
111 /* Initialize the objcount in the proc filesystem. */
sctp_dbg_objcnt_init(struct net * net)112 void sctp_dbg_objcnt_init(struct net *net)
113 {
114 struct proc_dir_entry *ent;
115
116 ent = proc_create_seq("sctp_dbg_objcnt", 0,
117 net->sctp.proc_net_sctp, &sctp_objcnt_seq_ops);
118 if (!ent)
119 pr_warn("sctp_dbg_objcnt: Unable to create /proc entry.\n");
120 }
121
