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47505b8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
60c778b2 | 2 | /* SCTP kernel implementation |
1da177e4 | 3 | * (C) Copyright IBM Corp. 2001, 2004 |
d808ad9a | 4 | * |
60c778b2 | 5 | * This file is part of the SCTP kernel implementation |
d808ad9a | 6 | * |
1da177e4 | 7 | * Support for memory object debugging. This allows one to monitor the |
d808ad9a YH |
8 | * object allocations/deallocations for types instrumented for this |
9 | * via the proc fs. | |
10 | * | |
1da177e4 LT |
11 | * Please send any bug reports or fixes you make to the |
12 | * email address(es): | |
91705c61 | 13 | * lksctp developers <linux-sctp@vger.kernel.org> |
d808ad9a | 14 | * |
d808ad9a | 15 | * Written or modified by: |
1da177e4 | 16 | * Jon Grimm <jgrimm@us.ibm.com> |
1da177e4 LT |
17 | */ |
18 | ||
145ce502 JP |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
20 | ||
1da177e4 LT |
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); | |
1da177e4 | 39 | SCTP_DBG_OBJCNT(datamsg); |
1f485649 | 40 | SCTP_DBG_OBJCNT(keys); |
1da177e4 LT |
41 | |
42 | /* An array to make it easy to pretty print the debug information | |
43 | * to the proc fs. | |
44 | */ | |
d38ef5ae | 45 | static struct sctp_dbg_objcnt_entry sctp_dbg_objcnt[] = { |
1da177e4 LT |
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), | |
1da177e4 | 54 | SCTP_DBG_OBJCNT_ENTRY(datamsg), |
1f485649 | 55 | SCTP_DBG_OBJCNT_ENTRY(keys), |
1da177e4 LT |
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. | |
1da177e4 | 61 | */ |
8ff65b46 | 62 | static int sctp_objcnt_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 63 | { |
652586df | 64 | int i; |
1da177e4 | 65 | |
8ff65b46 | 66 | i = (int)*(loff_t *)v; |
652586df TH |
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'); | |
8ff65b46 PE |
71 | return 0; |
72 | } | |
73 | ||
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 | ||
79 | static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v) | |
80 | { | |
81 | } | |
82 | ||
26ac8e5f | 83 | static void *sctp_objcnt_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
8ff65b46 PE |
84 | { |
85 | ++*pos; | |
86 | return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos; | |
1da177e4 LT |
87 | } |
88 | ||
8ff65b46 PE |
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 | ||
1da177e4 | 96 | /* Initialize the objcount in the proc filesystem. */ |
13d782f6 | 97 | void sctp_dbg_objcnt_init(struct net *net) |
1da177e4 | 98 | { |
ee71a29e | 99 | struct proc_dir_entry *ent; |
8ff65b46 | 100 | |
fddda2b7 CH |
101 | ent = proc_create_seq("sctp_dbg_objcnt", 0, |
102 | net->sctp.proc_net_sctp, &sctp_objcnt_seq_ops); | |
ee71a29e | 103 | if (!ent) |
145ce502 | 104 | pr_warn("sctp_dbg_objcnt: Unable to create /proc entry.\n"); |
1da177e4 | 105 | } |