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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, 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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