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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 int proc_do_xprt(struct ctl_table *table, int write,
44 void *buffer, size_t *lenp, loff_t *ppos)
45{
46 char tmpbuf[256];
47 ssize_t len;
48
49 if (write || *ppos) {
50 *lenp = 0;
51 return 0;
52 }
53 len = svc_print_xprts(tmpbuf, sizeof(tmpbuf));
54 len = memory_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len);
55
56 if (len < 0) {
57 *lenp = 0;
58 return -EINVAL;
59 }
60 *lenp = len;
61 return 0;
62}
63
64static int
65proc_dodebug(struct ctl_table *table, int write, void *buffer, size_t *lenp,
66 loff_t *ppos)
67{
68 char tmpbuf[20], *s = NULL;
69 char *p;
70 unsigned int value;
71 size_t left, len;
72
73 if ((*ppos && !write) || !*lenp) {
74 *lenp = 0;
75 return 0;
76 }
77
78 left = *lenp;
79
80 if (write) {
81 p = buffer;
82 while (left && isspace(*p)) {
83 left--;
84 p++;
85 }
86 if (!left)
87 goto done;
88
89 if (left > sizeof(tmpbuf) - 1)
90 return -EINVAL;
91 memcpy(tmpbuf, p, left);
92 tmpbuf[left] = '\0';
93
94 value = simple_strtol(tmpbuf, &s, 0);
95 if (s) {
96 left -= (s - tmpbuf);
97 if (left && !isspace(*s))
98 return -EINVAL;
99 while (left && isspace(*s)) {
100 left--;
101 s++;
102 }
103 } else
104 left = 0;
105 *(unsigned int *) table->data = value;
106 /* Display the RPC tasks on writing to rpc_debug */
107 if (strcmp(table->procname, "rpc_debug") == 0)
108 rpc_show_tasks(&init_net);
109 } else {
110 len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data);
111 if (len > left)
112 len = left;
113 memcpy(buffer, tmpbuf, len);
114 if ((left -= len) > 0) {
115 *((char *)buffer + len) = '\n';
116 left--;
117 }
118 }
119
120done:
121 *lenp -= left;
122 *ppos += *lenp;
123 return 0;
124}
125
126static struct ctl_table_header *sunrpc_table_header;
127
128static struct ctl_table debug_table[] = {
129 {
130 .procname = "rpc_debug",
131 .data = &rpc_debug,
132 .maxlen = sizeof(int),
133 .mode = 0644,
134 .proc_handler = proc_dodebug
135 },
136 {
137 .procname = "nfs_debug",
138 .data = &nfs_debug,
139 .maxlen = sizeof(int),
140 .mode = 0644,
141 .proc_handler = proc_dodebug
142 },
143 {
144 .procname = "nfsd_debug",
145 .data = &nfsd_debug,
146 .maxlen = sizeof(int),
147 .mode = 0644,
148 .proc_handler = proc_dodebug
149 },
150 {
151 .procname = "nlm_debug",
152 .data = &nlm_debug,
153 .maxlen = sizeof(int),
154 .mode = 0644,
155 .proc_handler = proc_dodebug
156 },
157 {
158 .procname = "transports",
159 .maxlen = 256,
160 .mode = 0444,
161 .proc_handler = proc_do_xprt,
162 },
163 { }
164};
165
166void
167rpc_register_sysctl(void)
168{
169 if (!sunrpc_table_header)
170 sunrpc_table_header = register_sysctl("sunrpc", debug_table);
171}
172
173void
174rpc_unregister_sysctl(void)
175{
176 if (sunrpc_table_header) {
177 unregister_sysctl_table(sunrpc_table_header);
178 sunrpc_table_header = NULL;
179 }
180}
181#endif
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