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 */
29 unsigned int rpc_debug;
30 EXPORT_SYMBOL_GPL(rpc_debug);
31
32 unsigned int nfs_debug;
33 EXPORT_SYMBOL_GPL(nfs_debug);
34
35 unsigned int nfsd_debug;
36 EXPORT_SYMBOL_GPL(nfsd_debug);
37
38 unsigned int nlm_debug;
39 EXPORT_SYMBOL_GPL(nlm_debug);
40
41 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
42
43 static struct ctl_table_header *sunrpc_table_header;
44 static struct ctl_table sunrpc_table[];
45
46 void
47 rpc_register_sysctl(void)
48 {
49 if (!sunrpc_table_header)
50 sunrpc_table_header = register_sysctl_table(sunrpc_table);
51 }
52
53 void
54 rpc_unregister_sysctl(void)
55 {
56 if (sunrpc_table_header) {
57 unregister_sysctl_table(sunrpc_table_header);
58 sunrpc_table_header = NULL;
59 }
60 }
61
62 static 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
83 static int
84 proc_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
139 done:
140 *lenp -= left;
141 *ppos += *lenp;
142 return 0;
143 }
144
145
146 static 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
184 static struct ctl_table sunrpc_table[] = {
185 {
186 .procname = "sunrpc",
187 .mode = 0555,
188 .child = debug_table
189 },
190 { }
191 };
192
193 #endif
194
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.