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--; 113 s++; 114 } 115 } else 116 left = 0; 117 *(unsigned int *) table->data = value; 118 /* Display the RPC tasks on writing to rpc_debug */ 119 if (strcmp(table->procname, "rpc_debug") == 0) 120 rpc_show_tasks(&init_net); 121 } else { 122 len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data); 123 if (len > left) 124 len = left; 125 memcpy(buffer, tmpbuf, len); 126 if ((left -= len) > 0) { 127 *((char *)buffer + len) = '\n'; 128 left--; 129 } 130 } 131 132 done: 133 *lenp -= left; 134 *ppos += *lenp; 135 return 0; 136 } 137 138 139 static struct ctl_table debug_table[] = { 140 { 141 .procname = "rpc_debug", 142 .data = &rpc_debug, 143 .maxlen = sizeof(int), 144 .mode = 0644, 145 .proc_handler = proc_dodebug 146 }, 147 { 148 .procname = "nfs_debug", 149 .data = &nfs_debug, 150 .maxlen = sizeof(int), 151 .mode = 0644, 152 .proc_handler = proc_dodebug 153 }, 154 { 155 .procname = "nfsd_debug", 156 .data = &nfsd_debug, 157 .maxlen = sizeof(int), 158 .mode = 0644, 159 .proc_handler = proc_dodebug 160 }, 161 { 162 .procname = "nlm_debug", 163 .data = &nlm_debug, 164 .maxlen = sizeof(int), 165 .mode = 0644, 166 .proc_handler = proc_dodebug 167 }, 168 { 169 .procname = "transports", 170 .maxlen = 256, 171 .mode = 0444, 172 .proc_handler = proc_do_xprt, 173 }, 174 { } 175 }; 176 177 static struct ctl_table sunrpc_table[] = { 178 { 179 .procname = "sunrpc", 180 .mode = 0555, 181 .child = debug_table 182 }, 183 { } 184 }; 185 186 #endif 187