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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 */
29unsigned int rpc_debug;
30EXPORT_SYMBOL_GPL(rpc_debug);
31
32unsigned int nfs_debug;
33EXPORT_SYMBOL_GPL(nfs_debug);
34
35unsigned int nfsd_debug;
36EXPORT_SYMBOL_GPL(nfsd_debug);
37
38unsigned int nlm_debug;
39EXPORT_SYMBOL_GPL(nlm_debug);
40
41#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
42
43static struct ctl_table_header *sunrpc_table_header;
44static struct ctl_table sunrpc_table[];
45
46void
47rpc_register_sysctl(void)
48{
49 if (!sunrpc_table_header)
50 sunrpc_table_header = register_sysctl_table(sunrpc_table);
51}
52
53void
54rpc_unregister_sysctl(void)
55{
56 if (sunrpc_table_header) {
57 unregister_sysctl_table(sunrpc_table_header);
58 sunrpc_table_header = NULL;
59 }
60}
61
62static 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
83static int
84proc_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
139done:
140 *lenp -= left;
141 *ppos += *lenp;
142 return 0;
143}
144
145
146static 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
184static struct ctl_table sunrpc_table[] = {
185 {
186 .procname = "sunrpc",
187 .mode = 0555,
188 .child = debug_table
189 },
190 { }
191};
192
193#endif
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 <asm/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 */
28unsigned int rpc_debug;
29EXPORT_SYMBOL_GPL(rpc_debug);
30
31unsigned int nfs_debug;
32EXPORT_SYMBOL_GPL(nfs_debug);
33
34unsigned int nfsd_debug;
35EXPORT_SYMBOL_GPL(nfsd_debug);
36
37unsigned int nlm_debug;
38EXPORT_SYMBOL_GPL(nlm_debug);
39
40#ifdef RPC_DEBUG
41
42static struct ctl_table_header *sunrpc_table_header;
43static struct ctl_table sunrpc_table[];
44
45void
46rpc_register_sysctl(void)
47{
48 if (!sunrpc_table_header)
49 sunrpc_table_header = register_sysctl_table(sunrpc_table);
50}
51
52void
53rpc_unregister_sysctl(void)
54{
55 if (sunrpc_table_header) {
56 unregister_sysctl_table(sunrpc_table_header);
57 sunrpc_table_header = NULL;
58 }
59}
60
61static 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
75static int
76proc_dodebug(struct ctl_table *table, int write,
77 void __user *buffer, size_t *lenp, loff_t *ppos)
78{
79 char tmpbuf[20], c, *s;
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 for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--)
107 value = 10 * value + (*s - '0');
108 if (*s && !isspace(*s))
109 return -EINVAL;
110 while (left && isspace(*s))
111 left--, s++;
112 *(unsigned int *) table->data = value;
113 /* Display the RPC tasks on writing to rpc_debug */
114 if (strcmp(table->procname, "rpc_debug") == 0)
115 rpc_show_tasks(&init_net);
116 } else {
117 if (!access_ok(VERIFY_WRITE, buffer, left))
118 return -EFAULT;
119 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
120 if (len > left)
121 len = left;
122 if (__copy_to_user(buffer, tmpbuf, len))
123 return -EFAULT;
124 if ((left -= len) > 0) {
125 if (put_user('\n', (char __user *)buffer + len))
126 return -EFAULT;
127 left--;
128 }
129 }
130
131done:
132 *lenp -= left;
133 *ppos += *lenp;
134 return 0;
135}
136
137
138static struct ctl_table debug_table[] = {
139 {
140 .procname = "rpc_debug",
141 .data = &rpc_debug,
142 .maxlen = sizeof(int),
143 .mode = 0644,
144 .proc_handler = proc_dodebug
145 },
146 {
147 .procname = "nfs_debug",
148 .data = &nfs_debug,
149 .maxlen = sizeof(int),
150 .mode = 0644,
151 .proc_handler = proc_dodebug
152 },
153 {
154 .procname = "nfsd_debug",
155 .data = &nfsd_debug,
156 .maxlen = sizeof(int),
157 .mode = 0644,
158 .proc_handler = proc_dodebug
159 },
160 {
161 .procname = "nlm_debug",
162 .data = &nlm_debug,
163 .maxlen = sizeof(int),
164 .mode = 0644,
165 .proc_handler = proc_dodebug
166 },
167 {
168 .procname = "transports",
169 .maxlen = 256,
170 .mode = 0444,
171 .proc_handler = proc_do_xprt,
172 },
173 { }
174};
175
176static struct ctl_table sunrpc_table[] = {
177 {
178 .procname = "sunrpc",
179 .mode = 0555,
180 .child = debug_table
181 },
182 { }
183};
184
185#endif