Loading...
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/*
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