1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 *
5 * This file is part of the SCTP kernel implementation
6 *
7 * Support for memory object debugging. This allows one to monitor the
8 * object allocations/deallocations for types instrumented for this
9 * via the proc fs.
10 *
11 * Please send any bug reports or fixes you make to the
12 * email address(es):
13 * lksctp developers <linux-sctp@vger.kernel.org>
14 *
15 * Written or modified by:
16 * Jon Grimm <jgrimm@us.ibm.com>
17 */
18
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
21 #include <linux/kernel.h>
22 #include <net/sctp/sctp.h>
23
24 /*
25 * Global counters to count raw object allocation counts.
26 * To add new counters, choose a unique suffix for the variable
27 * name as the helper macros key off this suffix to make
28 * life easier for the programmer.
29 */
30
31 SCTP_DBG_OBJCNT(sock);
32 SCTP_DBG_OBJCNT(ep);
33 SCTP_DBG_OBJCNT(transport);
34 SCTP_DBG_OBJCNT(assoc);
35 SCTP_DBG_OBJCNT(bind_addr);
36 SCTP_DBG_OBJCNT(bind_bucket);
37 SCTP_DBG_OBJCNT(chunk);
38 SCTP_DBG_OBJCNT(addr);
39 SCTP_DBG_OBJCNT(datamsg);
40 SCTP_DBG_OBJCNT(keys);
41
42 /* An array to make it easy to pretty print the debug information
43 * to the proc fs.
44 */
45 static struct sctp_dbg_objcnt_entry sctp_dbg_objcnt[] = {
46 SCTP_DBG_OBJCNT_ENTRY(sock),
47 SCTP_DBG_OBJCNT_ENTRY(ep),
48 SCTP_DBG_OBJCNT_ENTRY(assoc),
49 SCTP_DBG_OBJCNT_ENTRY(transport),
50 SCTP_DBG_OBJCNT_ENTRY(chunk),
51 SCTP_DBG_OBJCNT_ENTRY(bind_addr),
52 SCTP_DBG_OBJCNT_ENTRY(bind_bucket),
53 SCTP_DBG_OBJCNT_ENTRY(addr),
54 SCTP_DBG_OBJCNT_ENTRY(datamsg),
55 SCTP_DBG_OBJCNT_ENTRY(keys),
56 };
57
58 /* Callback from procfs to read out objcount information.
59 * Walk through the entries in the sctp_dbg_objcnt array, dumping
60 * the raw object counts for each monitored type.
61 */
sctp_objcnt_seq_show(struct seq_file * seq,void * v)62 static int sctp_objcnt_seq_show(struct seq_file *seq, void *v)
63 {
64 int i;
65
66 i = (int)*(loff_t *)v;
67 seq_setwidth(seq, 127);
68 seq_printf(seq, "%s: %d", sctp_dbg_objcnt[i].label,
69 atomic_read(sctp_dbg_objcnt[i].counter));
70 seq_pad(seq, '\n');
71 return 0;
72 }
73
sctp_objcnt_seq_start(struct seq_file * seq,loff_t * pos)74 static void *sctp_objcnt_seq_start(struct seq_file *seq, loff_t *pos)
75 {
76 return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
77 }
78
sctp_objcnt_seq_stop(struct seq_file * seq,void * v)79 static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v)
80 {
81 }
82
sctp_objcnt_seq_next(struct seq_file * seq,void * v,loff_t * pos)83 static void *sctp_objcnt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
84 {
85 ++*pos;
86 return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
87 }
88
89 static const struct seq_operations sctp_objcnt_seq_ops = {
90 .start = sctp_objcnt_seq_start,
91 .next = sctp_objcnt_seq_next,
92 .stop = sctp_objcnt_seq_stop,
93 .show = sctp_objcnt_seq_show,
94 };
95
96 /* Initialize the objcount in the proc filesystem. */
sctp_dbg_objcnt_init(struct net * net)97 void sctp_dbg_objcnt_init(struct net *net)
98 {
99 struct proc_dir_entry *ent;
100
101 ent = proc_create_seq("sctp_dbg_objcnt", 0,
102 net->sctp.proc_net_sctp, &sctp_objcnt_seq_ops);
103 if (!ent)
104 pr_warn("sctp_dbg_objcnt: Unable to create /proc entry.\n");
105 }
106