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 <linux-sctp@vger.kernel.org> 30 * 31 * Written or modified by: 32 * Jon Grimm <jgrimm@us.ibm.com> 33 */ 34 35 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 36 37 #include <linux/kernel.h> 38 #include <net/sctp/sctp.h> 39 40 /* 41 * Global counters to count raw object allocation counts. 42 * To add new counters, choose a unique suffix for the variable 43 * name as the helper macros key off this suffix to make 44 * life easier for the programmer. 45 */ 46 47 SCTP_DBG_OBJCNT(sock); 48 SCTP_DBG_OBJCNT(ep); 49 SCTP_DBG_OBJCNT(transport); 50 SCTP_DBG_OBJCNT(assoc); 51 SCTP_DBG_OBJCNT(bind_addr); 52 SCTP_DBG_OBJCNT(bind_bucket); 53 SCTP_DBG_OBJCNT(chunk); 54 SCTP_DBG_OBJCNT(addr); 55 SCTP_DBG_OBJCNT(ssnmap); 56 SCTP_DBG_OBJCNT(datamsg); 57 SCTP_DBG_OBJCNT(keys); 58 59 /* An array to make it easy to pretty print the debug information 60 * to the proc fs. 61 */ 62 static sctp_dbg_objcnt_entry_t sctp_dbg_objcnt[] = { 63 SCTP_DBG_OBJCNT_ENTRY(sock), 64 SCTP_DBG_OBJCNT_ENTRY(ep), 65 SCTP_DBG_OBJCNT_ENTRY(assoc), 66 SCTP_DBG_OBJCNT_ENTRY(transport), 67 SCTP_DBG_OBJCNT_ENTRY(chunk), 68 SCTP_DBG_OBJCNT_ENTRY(bind_addr), 69 SCTP_DBG_OBJCNT_ENTRY(bind_bucket), 70 SCTP_DBG_OBJCNT_ENTRY(addr), 71 SCTP_DBG_OBJCNT_ENTRY(ssnmap), 72 SCTP_DBG_OBJCNT_ENTRY(datamsg), 73 SCTP_DBG_OBJCNT_ENTRY(keys), 74 }; 75 76 /* Callback from procfs to read out objcount information. 77 * Walk through the entries in the sctp_dbg_objcnt array, dumping 78 * the raw object counts for each monitored type. 79 */ 80 static int sctp_objcnt_seq_show(struct seq_file *seq, void *v) 81 { 82 int i, len; 83 84 i = (int)*(loff_t *)v; 85 seq_printf(seq, "%s: %d%n", sctp_dbg_objcnt[i].label, 86 atomic_read(sctp_dbg_objcnt[i].counter), &len); 87 seq_printf(seq, "%*s\n", 127 - len, ""); 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