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