1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/net/sunrpc/sysctl.c 4 * 5 * Sysctl interface to sunrpc module. 6 * 7 * I would prefer to register the sunrpc table below sys/net, but that's 8 * impossible at the moment. 9 */ 10 11 #include <linux/types.h> 12 #include <linux/linkage.h> 13 #include <linux/ctype.h> 14 #include <linux/fs.h> 15 #include <linux/sysctl.h> 16 #include <linux/module.h> 17 18 #include <linux/uaccess.h> 19 #include <linux/sunrpc/types.h> 20 #include <linux/sunrpc/sched.h> 21 #include <linux/sunrpc/stats.h> 22 #include <linux/sunrpc/svc_xprt.h> 23 24 #include "netns.h" 25 26 /* 27 * Declare the debug flags here 28 */ 29 unsigned int rpc_debug; 30 EXPORT_SYMBOL_GPL(rpc_debug); 31 32 unsigned int nfs_debug; 33 EXPORT_SYMBOL_GPL(nfs_debug); 34 35 unsigned int nfsd_debug; 36 EXPORT_SYMBOL_GPL(nfsd_debug); 37 38 unsigned int nlm_debug; 39 EXPORT_SYMBOL_GPL(nlm_debug); 40 41 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 42 43 static struct ctl_table_header *sunrpc_table_header; 44 static struct ctl_table sunrpc_table[]; 45 46 void 47 rpc_register_sysctl(void) 48 { 49 if (!sunrpc_table_header) 50 sunrpc_table_header = register_sysctl_table(sunrpc_table); 51 } 52 53 void 54 rpc_unregister_sysctl(void) 55 { 56 if (sunrpc_table_header) { 57 unregister_sysctl_table(sunrpc_table_header); 58 sunrpc_table_header = NULL; 59 } 60 } 61 62 static int proc_do_xprt(struct ctl_table *table, int write, 63 void *buffer, size_t *lenp, loff_t *ppos) 64 { 65 char tmpbuf[256]; 66 size_t len; 67 68 if ((*ppos && !write) || !*lenp) { 69 *lenp = 0; 70 return 0; 71 } 72 len = svc_print_xprts(tmpbuf, sizeof(tmpbuf)); 73 return memory_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len); 74 } 75 76 static int 77 proc_dodebug(struct ctl_table *table, int write, void *buffer, size_t *lenp, 78 loff_t *ppos) 79 { 80 char tmpbuf[20], *s = NULL; 81 char *p; 82 unsigned int value; 83 size_t left, len; 84 85 if ((*ppos && !write) || !*lenp) { 86 *lenp = 0; 87 return 0; 88 } 89 90 left = *lenp; 91 92 if (write) { 93 p = buffer; 94 while (left && isspace(*p)) { 95 left--; 96 p++; 97 } 98 if (!left) 99 goto done; 100 101 if (left > sizeof(tmpbuf) - 1) 102 return -EINVAL; 103 memcpy(tmpbuf, p, left); 104 tmpbuf[left] = '\0'; 105 106 value = simple_strtol(tmpbuf, &s, 0); 107 if (s) { 108 left -= (s - tmpbuf); 109 if (left && !isspace(*s)) 110 return -EINVAL; 111 while (left && isspace(*s)) 112 left--, s++; 113 } else 114 left = 0; 115 *(unsigned int *) table->data = value; 116 /* Display the RPC tasks on writing to rpc_debug */ 117 if (strcmp(table->procname, "rpc_debug") == 0) 118 rpc_show_tasks(&init_net); 119 } else { 120 len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data); 121 if (len > left) 122 len = left; 123 memcpy(buffer, tmpbuf, len); 124 if ((left -= len) > 0) { 125 *((char *)buffer + len) = '\n'; 126 left--; 127 } 128 } 129 130 done: 131 *lenp -= left; 132 *ppos += *lenp; 133 return 0; 134 } 135 136 137 static struct ctl_table debug_table[] = { 138 { 139 .procname = "rpc_debug", 140 .data = &rpc_debug, 141 .maxlen = sizeof(int), 142 .mode = 0644, 143 .proc_handler = proc_dodebug 144 }, 145 { 146 .procname = "nfs_debug", 147 .data = &nfs_debug, 148 .maxlen = sizeof(int), 149 .mode = 0644, 150 .proc_handler = proc_dodebug 151 }, 152 { 153 .procname = "nfsd_debug", 154 .data = &nfsd_debug, 155 .maxlen = sizeof(int), 156 .mode = 0644, 157 .proc_handler = proc_dodebug 158 }, 159 { 160 .procname = "nlm_debug", 161 .data = &nlm_debug, 162 .maxlen = sizeof(int), 163 .mode = 0644, 164 .proc_handler = proc_dodebug 165 }, 166 { 167 .procname = "transports", 168 .maxlen = 256, 169 .mode = 0444, 170 .proc_handler = proc_do_xprt, 171 }, 172 { } 173 }; 174 175 static struct ctl_table sunrpc_table[] = { 176 { 177 .procname = "sunrpc", 178 .mode = 0555, 179 .child = debug_table 180 }, 181 { } 182 }; 183 184 #endif 185