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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 __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
76static int
77proc_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
133done:
134 *lenp -= left;
135 *ppos += *lenp;
136 return 0;
137}
138
139
140static 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
178static struct ctl_table sunrpc_table[] = {
179 {
180 .procname = "sunrpc",
181 .mode = 0555,
182 .child = debug_table
183 },
184 { }
185};
186
187#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