linux/net/sctp/objcnt.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* SCTP kernel implementation
 * (C) Copyright IBM Corp. 2001, 2004
 *
 * This file is part of the SCTP kernel implementation
 *
 * Support for memory object debugging.  This allows one to monitor the
 * object allocations/deallocations for types instrumented for this
 * via the proc fs.
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <[email protected]>
 *
 * Written or modified by:
 *    Jon Grimm             <[email protected]>
 */

#define pr_fmt(fmt) …

#include <linux/kernel.h>
#include <net/sctp/sctp.h>

/*
 * Global counters to count raw object allocation counts.
 * To add new counters, choose a unique suffix for the variable
 * name as the helper macros key off this suffix to make
 * life easier for the programmer.
 */

SCTP_DBG_OBJCNT(sock);
SCTP_DBG_OBJCNT(ep);
SCTP_DBG_OBJCNT(transport);
SCTP_DBG_OBJCNT(assoc);
SCTP_DBG_OBJCNT(bind_addr);
SCTP_DBG_OBJCNT(bind_bucket);
SCTP_DBG_OBJCNT(chunk);
SCTP_DBG_OBJCNT(addr);
SCTP_DBG_OBJCNT(datamsg);
SCTP_DBG_OBJCNT(keys);

/* An array to make it easy to pretty print the debug information
 * to the proc fs.
 */
static struct sctp_dbg_objcnt_entry sctp_dbg_objcnt[] = …;

/* Callback from procfs to read out objcount information.
 * Walk through the entries in the sctp_dbg_objcnt array, dumping
 * the raw object counts for each monitored type.
 */
static int sctp_objcnt_seq_show(struct seq_file *seq, void *v)
{ … }

static void *sctp_objcnt_seq_start(struct seq_file *seq, loff_t *pos)
{ … }

static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v)
{ … }

static void *sctp_objcnt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{ … }

static const struct seq_operations sctp_objcnt_seq_ops = …;

/* Initialize the objcount in the proc filesystem.  */
void sctp_dbg_objcnt_init(struct net *net)
{ … }