xref: /openbmc/linux/net/sctp/objcnt.c (revision 47505b8b)
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