linux/net/sctp/objcnt.c
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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, write to
  24 * the Free Software Foundation, 59 Temple Place - Suite 330,
  25 * Boston, MA 02111-1307, USA.
  26 *
  27 * Please send any bug reports or fixes you make to the
  28 * email address(es):
  29 *    lksctp developers <lksctp-developers@lists.sourceforge.net>
  30 *
  31 * Or submit a bug report through the following website:
  32 *    http://www.sf.net/projects/lksctp
  33 *
  34 * Written or modified by:
  35 *    Jon Grimm             <jgrimm@us.ibm.com>
  36 *
  37 * Any bugs reported given to us we will try to fix... any fixes shared will
  38 * be incorporated into the next SCTP release.
  39 */
  40
  41#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  42
  43#include <linux/kernel.h>
  44#include <net/sctp/sctp.h>
  45
  46/*
  47 * Global counters to count raw object allocation counts.
  48 * To add new counters, choose a unique suffix for the variable
  49 * name as the helper macros key off this suffix to make
  50 * life easier for the programmer.
  51 */
  52
  53SCTP_DBG_OBJCNT(sock);
  54SCTP_DBG_OBJCNT(ep);
  55SCTP_DBG_OBJCNT(transport);
  56SCTP_DBG_OBJCNT(assoc);
  57SCTP_DBG_OBJCNT(bind_addr);
  58SCTP_DBG_OBJCNT(bind_bucket);
  59SCTP_DBG_OBJCNT(chunk);
  60SCTP_DBG_OBJCNT(addr);
  61SCTP_DBG_OBJCNT(ssnmap);
  62SCTP_DBG_OBJCNT(datamsg);
  63SCTP_DBG_OBJCNT(keys);
  64
  65/* An array to make it easy to pretty print the debug information
  66 * to the proc fs.
  67 */
  68static sctp_dbg_objcnt_entry_t sctp_dbg_objcnt[] = {
  69        SCTP_DBG_OBJCNT_ENTRY(sock),
  70        SCTP_DBG_OBJCNT_ENTRY(ep),
  71        SCTP_DBG_OBJCNT_ENTRY(assoc),
  72        SCTP_DBG_OBJCNT_ENTRY(transport),
  73        SCTP_DBG_OBJCNT_ENTRY(chunk),
  74        SCTP_DBG_OBJCNT_ENTRY(bind_addr),
  75        SCTP_DBG_OBJCNT_ENTRY(bind_bucket),
  76        SCTP_DBG_OBJCNT_ENTRY(addr),
  77        SCTP_DBG_OBJCNT_ENTRY(ssnmap),
  78        SCTP_DBG_OBJCNT_ENTRY(datamsg),
  79        SCTP_DBG_OBJCNT_ENTRY(keys),
  80};
  81
  82/* Callback from procfs to read out objcount information.
  83 * Walk through the entries in the sctp_dbg_objcnt array, dumping
  84 * the raw object counts for each monitored type.
  85 */
  86static int sctp_objcnt_seq_show(struct seq_file *seq, void *v)
  87{
  88        int i, len;
  89
  90        i = (int)*(loff_t *)v;
  91        seq_printf(seq, "%s: %d%n", sctp_dbg_objcnt[i].label,
  92                                atomic_read(sctp_dbg_objcnt[i].counter), &len);
  93        seq_printf(seq, "%*s\n", 127 - len, "");
  94        return 0;
  95}
  96
  97static void *sctp_objcnt_seq_start(struct seq_file *seq, loff_t *pos)
  98{
  99        return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
 100}
 101
 102static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v)
 103{
 104}
 105
 106static void * sctp_objcnt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 107{
 108        ++*pos;
 109        return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
 110}
 111
 112static const struct seq_operations sctp_objcnt_seq_ops = {
 113        .start = sctp_objcnt_seq_start,
 114        .next  = sctp_objcnt_seq_next,
 115        .stop  = sctp_objcnt_seq_stop,
 116        .show  = sctp_objcnt_seq_show,
 117};
 118
 119static int sctp_objcnt_seq_open(struct inode *inode, struct file *file)
 120{
 121        return seq_open(file, &sctp_objcnt_seq_ops);
 122}
 123
 124static const struct file_operations sctp_objcnt_ops = {
 125        .open    = sctp_objcnt_seq_open,
 126        .read    = seq_read,
 127        .llseek  = seq_lseek,
 128        .release = seq_release,
 129};
 130
 131/* Initialize the objcount in the proc filesystem.  */
 132void sctp_dbg_objcnt_init(struct net *net)
 133{
 134        struct proc_dir_entry *ent;
 135
 136        ent = proc_create("sctp_dbg_objcnt", 0,
 137                          net->sctp.proc_net_sctp, &sctp_objcnt_ops);
 138        if (!ent)
 139                pr_warn("sctp_dbg_objcnt: Unable to create /proc entry.\n");
 140}
 141
 142/* Cleanup the objcount entry in the proc filesystem.  */
 143void sctp_dbg_objcnt_exit(struct net *net)
 144{
 145        remove_proc_entry("sctp_dbg_objcnt", net->sctp.proc_net_sctp);
 146}
 147
 148
 149
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