1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* SCTP kernel implementation 3 * (C) Copyright IBM Corp. 2001, 2004 4 * 5 * This file is part of the SCTP kernel implementation 6 * 7 * Support for memory object debugging. This allows one to monitor the 8 * object allocations/deallocations for types instrumented for this 9 * via the proc fs. 10 * 11 * Please send any bug reports or fixes you make to the 12 * email address(es): 13 * lksctp developers <linux-sctp@vger.kernel.org> 14 * 15 * Written or modified by: 16 * Jon Grimm <jgrimm@us.ibm.com> 17 */ 18 19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 20 21 #include <linux/kernel.h> 22 #include <net/sctp/sctp.h> 23 24 /* 25 * Global counters to count raw object allocation counts. 26 * To add new counters, choose a unique suffix for the variable 27 * name as the helper macros key off this suffix to make 28 * life easier for the programmer. 29 */ 30 31 SCTP_DBG_OBJCNT(sock); 32 SCTP_DBG_OBJCNT(ep); 33 SCTP_DBG_OBJCNT(transport); 34 SCTP_DBG_OBJCNT(assoc); 35 SCTP_DBG_OBJCNT(bind_addr); 36 SCTP_DBG_OBJCNT(bind_bucket); 37 SCTP_DBG_OBJCNT(chunk); 38 SCTP_DBG_OBJCNT(addr); 39 SCTP_DBG_OBJCNT(datamsg); 40 SCTP_DBG_OBJCNT(keys); 41 42 /* An array to make it easy to pretty print the debug information 43 * to the proc fs. 44 */ 45 static struct sctp_dbg_objcnt_entry sctp_dbg_objcnt[] = { 46 SCTP_DBG_OBJCNT_ENTRY(sock), 47 SCTP_DBG_OBJCNT_ENTRY(ep), 48 SCTP_DBG_OBJCNT_ENTRY(assoc), 49 SCTP_DBG_OBJCNT_ENTRY(transport), 50 SCTP_DBG_OBJCNT_ENTRY(chunk), 51 SCTP_DBG_OBJCNT_ENTRY(bind_addr), 52 SCTP_DBG_OBJCNT_ENTRY(bind_bucket), 53 SCTP_DBG_OBJCNT_ENTRY(addr), 54 SCTP_DBG_OBJCNT_ENTRY(datamsg), 55 SCTP_DBG_OBJCNT_ENTRY(keys), 56 }; 57 58 /* Callback from procfs to read out objcount information. 59 * Walk through the entries in the sctp_dbg_objcnt array, dumping 60 * the raw object counts for each monitored type. 61 */ 62 static int sctp_objcnt_seq_show(struct seq_file *seq, void *v) 63 { 64 int i; 65 66 i = (int)*(loff_t *)v; 67 seq_setwidth(seq, 127); 68 seq_printf(seq, "%s: %d", sctp_dbg_objcnt[i].label, 69 atomic_read(sctp_dbg_objcnt[i].counter)); 70 seq_pad(seq, '\n'); 71 return 0; 72 } 73 74 static void *sctp_objcnt_seq_start(struct seq_file *seq, loff_t *pos) 75 { 76 return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos; 77 } 78 79 static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v) 80 { 81 } 82 83 static void *sctp_objcnt_seq_next(struct seq_file *seq, void *v, loff_t *pos) 84 { 85 ++*pos; 86 return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos; 87 } 88 89 static const struct seq_operations sctp_objcnt_seq_ops = { 90 .start = sctp_objcnt_seq_start, 91 .next = sctp_objcnt_seq_next, 92 .stop = sctp_objcnt_seq_stop, 93 .show = sctp_objcnt_seq_show, 94 }; 95 96 /* Initialize the objcount in the proc filesystem. */ 97 void sctp_dbg_objcnt_init(struct net *net) 98 { 99 struct proc_dir_entry *ent; 100 101 ent = proc_create_seq("sctp_dbg_objcnt", 0, 102 net->sctp.proc_net_sctp, &sctp_objcnt_seq_ops); 103 if (!ent) 104 pr_warn("sctp_dbg_objcnt: Unable to create /proc entry.\n"); 105 } 106