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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, 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(ssnmap); |
55 | SCTP_DBG_OBJCNT(datamsg); |
56 | SCTP_DBG_OBJCNT(keys); |
57 | |
58 | /* An array to make it easy to pretty print the debug information |
59 | * to the proc fs. |
60 | */ |
61 | static sctp_dbg_objcnt_entry_t sctp_dbg_objcnt[] = { |
62 | SCTP_DBG_OBJCNT_ENTRY(sock), |
63 | SCTP_DBG_OBJCNT_ENTRY(ep), |
64 | SCTP_DBG_OBJCNT_ENTRY(assoc), |
65 | SCTP_DBG_OBJCNT_ENTRY(transport), |
66 | SCTP_DBG_OBJCNT_ENTRY(chunk), |
67 | SCTP_DBG_OBJCNT_ENTRY(bind_addr), |
68 | SCTP_DBG_OBJCNT_ENTRY(bind_bucket), |
69 | SCTP_DBG_OBJCNT_ENTRY(addr), |
70 | SCTP_DBG_OBJCNT_ENTRY(ssnmap), |
71 | SCTP_DBG_OBJCNT_ENTRY(datamsg), |
72 | SCTP_DBG_OBJCNT_ENTRY(keys), |
73 | }; |
74 | |
75 | /* Callback from procfs to read out objcount information. |
76 | * Walk through the entries in the sctp_dbg_objcnt array, dumping |
77 | * the raw object counts for each monitored type. |
78 | */ |
79 | static int sctp_objcnt_seq_show(struct seq_file *seq, void *v) |
80 | { |
81 | int i; |
82 | |
83 | i = (int)*(loff_t *)v; |
84 | seq_setwidth(seq, 127); |
85 | seq_printf(seq, "%s: %d", sctp_dbg_objcnt[i].label, |
86 | atomic_read(sctp_dbg_objcnt[i].counter)); |
87 | seq_pad(seq, '\n'); |
88 | return 0; |
89 | } |
90 | |
91 | static 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 | |
96 | static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v) |
97 | { |
98 | } |
99 | |
100 | static 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 | |
106 | static 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 | |
113 | static int sctp_objcnt_seq_open(struct inode *inode, struct file *file) |
114 | { |
115 | return seq_open(file, &sctp_objcnt_seq_ops); |
116 | } |
117 | |
118 | static 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. */ |
126 | void 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. */ |
137 | void sctp_dbg_objcnt_exit(struct net *net) |
138 | { |
139 | remove_proc_entry("sctp_dbg_objcnt", net->sctp.proc_net_sctp); |
140 | } |
141 | |
142 | |
143 |
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