1 /* SCTP kernel reference Implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * 4 * This file is part of the SCTP kernel reference 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 * The SCTP reference 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 * The SCTP reference 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 #include <linux/kernel.h> 42 #include <net/sctp/sctp.h> 43 44 /* 45 * Global counters to count raw object allocation counts. 46 * To add new counters, choose a unique suffix for the variable 47 * name as the helper macros key off this suffix to make 48 * life easier for the programmer. 49 */ 50 51 SCTP_DBG_OBJCNT(sock); 52 SCTP_DBG_OBJCNT(ep); 53 SCTP_DBG_OBJCNT(transport); 54 SCTP_DBG_OBJCNT(assoc); 55 SCTP_DBG_OBJCNT(bind_addr); 56 SCTP_DBG_OBJCNT(bind_bucket); 57 SCTP_DBG_OBJCNT(chunk); 58 SCTP_DBG_OBJCNT(addr); 59 SCTP_DBG_OBJCNT(ssnmap); 60 SCTP_DBG_OBJCNT(datamsg); 61 SCTP_DBG_OBJCNT(keys); 62 63 /* An array to make it easy to pretty print the debug information 64 * to the proc fs. 65 */ 66 static sctp_dbg_objcnt_entry_t sctp_dbg_objcnt[] = { 67 SCTP_DBG_OBJCNT_ENTRY(sock), 68 SCTP_DBG_OBJCNT_ENTRY(ep), 69 SCTP_DBG_OBJCNT_ENTRY(assoc), 70 SCTP_DBG_OBJCNT_ENTRY(transport), 71 SCTP_DBG_OBJCNT_ENTRY(chunk), 72 SCTP_DBG_OBJCNT_ENTRY(bind_addr), 73 SCTP_DBG_OBJCNT_ENTRY(bind_bucket), 74 SCTP_DBG_OBJCNT_ENTRY(addr), 75 SCTP_DBG_OBJCNT_ENTRY(ssnmap), 76 SCTP_DBG_OBJCNT_ENTRY(datamsg), 77 SCTP_DBG_OBJCNT_ENTRY(keys), 78 }; 79 80 /* Callback from procfs to read out objcount information. 81 * Walk through the entries in the sctp_dbg_objcnt array, dumping 82 * the raw object counts for each monitored type. 83 * 84 * This code was modified from similar code in route.c 85 */ 86 static int sctp_dbg_objcnt_read(char *buffer, char **start, off_t offset, 87 int length, int *eof, void *data) 88 { 89 int len = 0; 90 off_t pos = 0; 91 int entries; 92 int i; 93 char temp[128]; 94 95 /* How many entries? */ 96 entries = ARRAY_SIZE(sctp_dbg_objcnt); 97 98 /* Walk the entries and print out the debug information 99 * for proc fs. 100 */ 101 for (i = 0; i < entries; i++) { 102 pos += 128; 103 104 /* Skip ahead. */ 105 if (pos <= offset) { 106 len = 0; 107 continue; 108 } 109 /* Print out each entry. */ 110 sprintf(temp, "%s: %d", 111 sctp_dbg_objcnt[i].label, 112 atomic_read(sctp_dbg_objcnt[i].counter)); 113 114 sprintf(buffer + len, "%-127s\n", temp); 115 len += 128; 116 if (pos >= offset+length) 117 goto done; 118 } 119 120 done: 121 *start = buffer + len - (pos - offset); 122 len = pos - offset; 123 if (len > length) 124 len = length; 125 126 return len; 127 } 128 129 /* Initialize the objcount in the proc filesystem. */ 130 void sctp_dbg_objcnt_init(void) 131 { 132 struct proc_dir_entry *ent; 133 ent = create_proc_read_entry("sctp_dbg_objcnt", 0, proc_net_sctp, 134 sctp_dbg_objcnt_read, NULL); 135 if (!ent) 136 printk(KERN_WARNING 137 "sctp_dbg_objcnt: Unable to create /proc entry.\n"); 138 } 139 140 /* Cleanup the objcount entry in the proc filesystem. */ 141 void sctp_dbg_objcnt_exit(void) 142 { 143 remove_proc_entry("sctp_dbg_objcnt", proc_net_sctp); 144 } 145 146 147