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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/*
24 * Declare the debug flags here
25 */
26unsigned int rpc_debug;
27EXPORT_SYMBOL_GPL(rpc_debug);
28
29unsigned int nfs_debug;
30EXPORT_SYMBOL_GPL(nfs_debug);
31
32unsigned int nfsd_debug;
33EXPORT_SYMBOL_GPL(nfsd_debug);
34
35unsigned int nlm_debug;
36EXPORT_SYMBOL_GPL(nlm_debug);
37
38#ifdef RPC_DEBUG
39
40static struct ctl_table_header *sunrpc_table_header;
41static ctl_table sunrpc_table[];
42
43void
44rpc_register_sysctl(void)
45{
46 if (!sunrpc_table_header)
47 sunrpc_table_header = register_sysctl_table(sunrpc_table);
48}
49
50void
51rpc_unregister_sysctl(void)
52{
53 if (sunrpc_table_header) {
54 unregister_sysctl_table(sunrpc_table_header);
55 sunrpc_table_header = NULL;
56 }
57}
58
59static int proc_do_xprt(ctl_table *table, int write,
60 void __user *buffer, size_t *lenp, loff_t *ppos)
61{
62 char tmpbuf[256];
63 size_t len;
64
65 if ((*ppos && !write) || !*lenp) {
66 *lenp = 0;
67 return 0;
68 }
69 len = svc_print_xprts(tmpbuf, sizeof(tmpbuf));
70 return simple_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len);
71}
72
73static int
74proc_dodebug(ctl_table *table, int write,
75 void __user *buffer, size_t *lenp, loff_t *ppos)
76{
77 char tmpbuf[20], c, *s;
78 char __user *p;
79 unsigned int value;
80 size_t left, len;
81
82 if ((*ppos && !write) || !*lenp) {
83 *lenp = 0;
84 return 0;
85 }
86
87 left = *lenp;
88
89 if (write) {
90 if (!access_ok(VERIFY_READ, buffer, left))
91 return -EFAULT;
92 p = buffer;
93 while (left && __get_user(c, p) >= 0 && isspace(c))
94 left--, p++;
95 if (!left)
96 goto done;
97
98 if (left > sizeof(tmpbuf) - 1)
99 return -EINVAL;
100 if (copy_from_user(tmpbuf, p, left))
101 return -EFAULT;
102 tmpbuf[left] = '\0';
103
104 for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--)
105 value = 10 * value + (*s - '0');
106 if (*s && !isspace(*s))
107 return -EINVAL;
108 while (left && isspace(*s))
109 left--, s++;
110 *(unsigned int *) table->data = value;
111 /* Display the RPC tasks on writing to rpc_debug */
112 if (strcmp(table->procname, "rpc_debug") == 0)
113 rpc_show_tasks();
114 } else {
115 if (!access_ok(VERIFY_WRITE, buffer, left))
116 return -EFAULT;
117 len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
118 if (len > left)
119 len = left;
120 if (__copy_to_user(buffer, tmpbuf, len))
121 return -EFAULT;
122 if ((left -= len) > 0) {
123 if (put_user('\n', (char __user *)buffer + len))
124 return -EFAULT;
125 left--;
126 }
127 }
128
129done:
130 *lenp -= left;
131 *ppos += *lenp;
132 return 0;
133}
134
135
136static ctl_table debug_table[] = {
137 {
138 .procname = "rpc_debug",
139 .data = &rpc_debug,
140 .maxlen = sizeof(int),
141 .mode = 0644,
142 .proc_handler = proc_dodebug
143 },
144 {
145 .procname = "nfs_debug",
146 .data = &nfs_debug,
147 .maxlen = sizeof(int),
148 .mode = 0644,
149 .proc_handler = proc_dodebug
150 },
151 {
152 .procname = "nfsd_debug",
153 .data = &nfsd_debug,
154 .maxlen = sizeof(int),
155 .mode = 0644,
156 .proc_handler = proc_dodebug
157 },
158 {
159 .procname = "nlm_debug",
160 .data = &nlm_debug,
161 .maxlen = sizeof(int),
162 .mode = 0644,
163 .proc_handler = proc_dodebug
164 },
165 {
166 .procname = "transports",
167 .maxlen = 256,
168 .mode = 0444,
169 .proc_handler = proc_do_xprt,
170 },
171 { }
172};
173
174static ctl_table sunrpc_table[] = {
175 {
176 .procname = "sunrpc",
177 .mode = 0555,
178 .child = debug_table
179 },
180 { }
181};
182
183#endif