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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(datamsg);
 55 SCTP_DBG_OBJCNT(keys);
 56 
 57 /* An array to make it easy to pretty print the debug information
 58  * to the proc fs.
 59  */
 60 static struct sctp_dbg_objcnt_entry sctp_dbg_objcnt[] = {
 61         SCTP_DBG_OBJCNT_ENTRY(sock),
 62         SCTP_DBG_OBJCNT_ENTRY(ep),
 63         SCTP_DBG_OBJCNT_ENTRY(assoc),
 64         SCTP_DBG_OBJCNT_ENTRY(transport),
 65         SCTP_DBG_OBJCNT_ENTRY(chunk),
 66         SCTP_DBG_OBJCNT_ENTRY(bind_addr),
 67         SCTP_DBG_OBJCNT_ENTRY(bind_bucket),
 68         SCTP_DBG_OBJCNT_ENTRY(addr),
 69         SCTP_DBG_OBJCNT_ENTRY(datamsg),
 70         SCTP_DBG_OBJCNT_ENTRY(keys),
 71 };
 72 
 73 /* Callback from procfs to read out objcount information.
 74  * Walk through the entries in the sctp_dbg_objcnt array, dumping
 75  * the raw object counts for each monitored type.
 76  */
 77 static int sctp_objcnt_seq_show(struct seq_file *seq, void *v)
 78 {
 79         int i;
 80 
 81         i = (int)*(loff_t *)v;
 82         seq_setwidth(seq, 127);
 83         seq_printf(seq, "%s: %d", sctp_dbg_objcnt[i].label,
 84                                 atomic_read(sctp_dbg_objcnt[i].counter));
 85         seq_pad(seq, '\n');
 86         return 0;
 87 }
 88 
 89 static void *sctp_objcnt_seq_start(struct seq_file *seq, loff_t *pos)
 90 {
 91         return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
 92 }
 93 
 94 static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v)
 95 {
 96 }
 97 
 98 static void *sctp_objcnt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 99 {
100         ++*pos;
101         return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
102 }
103 
104 static const struct seq_operations sctp_objcnt_seq_ops = {
105         .start = sctp_objcnt_seq_start,
106         .next  = sctp_objcnt_seq_next,
107         .stop  = sctp_objcnt_seq_stop,
108         .show  = sctp_objcnt_seq_show,
109 };
110 
111 static int sctp_objcnt_seq_open(struct inode *inode, struct file *file)
112 {
113         return seq_open(file, &sctp_objcnt_seq_ops);
114 }
115 
116 static const struct file_operations sctp_objcnt_ops = {
117         .open    = sctp_objcnt_seq_open,
118         .read    = seq_read,
119         .llseek  = seq_lseek,
120         .release = seq_release,
121 };
122 
123 /* Initialize the objcount in the proc filesystem.  */
124 void sctp_dbg_objcnt_init(struct net *net)
125 {
126         struct proc_dir_entry *ent;
127 
128         ent = proc_create("sctp_dbg_objcnt", 0,
129                           net->sctp.proc_net_sctp, &sctp_objcnt_ops);
130         if (!ent)
131                 pr_warn("sctp_dbg_objcnt: Unable to create /proc entry.\n");
132 }
133 
134 /* Cleanup the objcount entry in the proc filesystem.  */
135 void sctp_dbg_objcnt_exit(struct net *net)
136 {
137         remove_proc_entry("sctp_dbg_objcnt", net->sctp.proc_net_sctp);
138 }
139 
140 
141 

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