1 /* 2 * linux/net/sunrpc/sysctl.c 3 * 4 * Sysctl interface to sunrpc module. 5 * 6 * I would prefer to register the sunrpc table below sys/net, but that's 7 * impossible at the moment. 8 */ 9 10 #include <linux/types.h> 11 #include <linux/linkage.h> 12 #include <linux/ctype.h> 13 #include <linux/fs.h> 14 #include <linux/sysctl.h> 15 #include <linux/module.h> 16 17 #include <linux/uaccess.h> 18 #include <linux/sunrpc/types.h> 19 #include <linux/sunrpc/sched.h> 20 #include <linux/sunrpc/stats.h> 21 #include <linux/sunrpc/svc_xprt.h> 22 23 #include "netns.h" 24 25 /* 26 * Declare the debug flags here 27 */ 28 unsigned int rpc_debug; 29 EXPORT_SYMBOL_GPL(rpc_debug); 30 31 unsigned int nfs_debug; 32 EXPORT_SYMBOL_GPL(nfs_debug); 33 34 unsigned int nfsd_debug; 35 EXPORT_SYMBOL_GPL(nfsd_debug); 36 37 unsigned int nlm_debug; 38 EXPORT_SYMBOL_GPL(nlm_debug); 39 40 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 41 42 static struct ctl_table_header *sunrpc_table_header; 43 static struct ctl_table sunrpc_table[]; 44 45 void 46 rpc_register_sysctl(void) 47 { 48 if (!sunrpc_table_header) 49 sunrpc_table_header = register_sysctl_table(sunrpc_table); 50 } 51 52 void 53 rpc_unregister_sysctl(void) 54 { 55 if (sunrpc_table_header) { 56 unregister_sysctl_table(sunrpc_table_header); 57 sunrpc_table_header = NULL; 58 } 59 } 60 61 static int proc_do_xprt(struct ctl_table *table, int write, 62 void __user *buffer, size_t *lenp, loff_t *ppos) 63 { 64 char tmpbuf[256]; 65 size_t len; 66 67 if ((*ppos && !write) || !*lenp) { 68 *lenp = 0; 69 return 0; 70 } 71 len = svc_print_xprts(tmpbuf, sizeof(tmpbuf)); 72 return simple_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len); 73 } 74 75 static int 76 proc_dodebug(struct ctl_table *table, int write, 77 void __user *buffer, size_t *lenp, loff_t *ppos) 78 { 79 char tmpbuf[20], c, *s = NULL; 80 char __user *p; 81 unsigned int value; 82 size_t left, len; 83 84 if ((*ppos && !write) || !*lenp) { 85 *lenp = 0; 86 return 0; 87 } 88 89 left = *lenp; 90 91 if (write) { 92 if (!access_ok(VERIFY_READ, buffer, left)) 93 return -EFAULT; 94 p = buffer; 95 while (left && __get_user(c, p) >= 0 && isspace(c)) 96 left--, p++; 97 if (!left) 98 goto done; 99 100 if (left > sizeof(tmpbuf) - 1) 101 return -EINVAL; 102 if (copy_from_user(tmpbuf, p, left)) 103 return -EFAULT; 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 if (copy_to_user(buffer, tmpbuf, len)) 124 return -EFAULT; 125 if ((left -= len) > 0) { 126 if (put_user('\n', (char __user *)buffer + len)) 127 return -EFAULT; 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