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 ssize_t len; 67 68 if (write || *ppos) { 69 *lenp = 0; 70 return 0; 71 } 72 len = svc_print_xprts(tmpbuf, sizeof(tmpbuf)); 73 len = memory_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len); 74 75 if (len < 0) { 76 *lenp = 0; 77 return -EINVAL; 78 } 79 *lenp = len; 80 return 0; 81 } 82 83 static int 84 proc_dodebug(struct ctl_table *table, int write, void *buffer, size_t *lenp, 85 loff_t *ppos) 86 { 87 char tmpbuf[20], *s = NULL; 88 char *p; 89 unsigned int value; 90 size_t left, len; 91 92 if ((*ppos && !write) || !*lenp) { 93 *lenp = 0; 94 return 0; 95 } 96 97 left = *lenp; 98 99 if (write) { 100 p = buffer; 101 while (left && isspace(*p)) { 102 left--; 103 p++; 104 } 105 if (!left) 106 goto done; 107 108 if (left > sizeof(tmpbuf) - 1) 109 return -EINVAL; 110 memcpy(tmpbuf, p, left); 111 tmpbuf[left] = '\0'; 112 113 value = simple_strtol(tmpbuf, &s, 0); 114 if (s) { 115 left -= (s - tmpbuf); 116 if (left && !isspace(*s)) 117 return -EINVAL; 118 while (left && isspace(*s)) { 119 left--; 120 s++; 121 } 122 } else 123 left = 0; 124 *(unsigned int *) table->data = value; 125 /* Display the RPC tasks on writing to rpc_debug */ 126 if (strcmp(table->procname, "rpc_debug") == 0) 127 rpc_show_tasks(&init_net); 128 } else { 129 len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data); 130 if (len > left) 131 len = left; 132 memcpy(buffer, tmpbuf, len); 133 if ((left -= len) > 0) { 134 *((char *)buffer + len) = '\n'; 135 left--; 136 } 137 } 138 139 done: 140 *lenp -= left; 141 *ppos += *lenp; 142 return 0; 143 } 144 145 146 static struct ctl_table debug_table[] = { 147 { 148 .procname = "rpc_debug", 149 .data = &rpc_debug, 150 .maxlen = sizeof(int), 151 .mode = 0644, 152 .proc_handler = proc_dodebug 153 }, 154 { 155 .procname = "nfs_debug", 156 .data = &nfs_debug, 157 .maxlen = sizeof(int), 158 .mode = 0644, 159 .proc_handler = proc_dodebug 160 }, 161 { 162 .procname = "nfsd_debug", 163 .data = &nfsd_debug, 164 .maxlen = sizeof(int), 165 .mode = 0644, 166 .proc_handler = proc_dodebug 167 }, 168 { 169 .procname = "nlm_debug", 170 .data = &nlm_debug, 171 .maxlen = sizeof(int), 172 .mode = 0644, 173 .proc_handler = proc_dodebug 174 }, 175 { 176 .procname = "transports", 177 .maxlen = 256, 178 .mode = 0444, 179 .proc_handler = proc_do_xprt, 180 }, 181 { } 182 }; 183 184 static struct ctl_table sunrpc_table[] = { 185 { 186 .procname = "sunrpc", 187 .mode = 0555, 188 .child = debug_table 189 }, 190 { } 191 }; 192 193 #endif 194