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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/*
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#if IS_ENABLED(CONFIG_SUNRPC_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 = NULL;
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 value = simple_strtol(tmpbuf, &s, 0);
107 if (s) {
108 left -= (s - tmpbuf);
109 if (left && !isspace(*s))
110 return -EINVAL;
111 while (left && isspace(*s))
112 left--, s++;
113 } else
114 left = 0;
115 *(unsigned int *) table->data = value;
116 /* Display the RPC tasks on writing to rpc_debug */
117 if (strcmp(table->procname, "rpc_debug") == 0)
118 rpc_show_tasks(&init_net);
119 } else {
120 len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data);
121 if (len > left)
122 len = left;
123 if (copy_to_user(buffer, tmpbuf, len))
124 return -EFAULT;
125 if ((left -= len) > 0) {
126 if (put_user('\n', (char __user *)buffer + len))
127 return -EFAULT;
128 left--;
129 }
130 }
131
132done:
133 *lenp -= left;
134 *ppos += *lenp;
135 return 0;
136}
137
138
139static struct ctl_table debug_table[] = {
140 {
141 .procname = "rpc_debug",
142 .data = &rpc_debug,
143 .maxlen = sizeof(int),
144 .mode = 0644,
145 .proc_handler = proc_dodebug
146 },
147 {
148 .procname = "nfs_debug",
149 .data = &nfs_debug,
150 .maxlen = sizeof(int),
151 .mode = 0644,
152 .proc_handler = proc_dodebug
153 },
154 {
155 .procname = "nfsd_debug",
156 .data = &nfsd_debug,
157 .maxlen = sizeof(int),
158 .mode = 0644,
159 .proc_handler = proc_dodebug
160 },
161 {
162 .procname = "nlm_debug",
163 .data = &nlm_debug,
164 .maxlen = sizeof(int),
165 .mode = 0644,
166 .proc_handler = proc_dodebug
167 },
168 {
169 .procname = "transports",
170 .maxlen = 256,
171 .mode = 0444,
172 .proc_handler = proc_do_xprt,
173 },
174 { }
175};
176
177static struct ctl_table sunrpc_table[] = {
178 {
179 .procname = "sunrpc",
180 .mode = 0555,
181 .child = debug_table
182 },
183 { }
184};
185
186#endif