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 <linux/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 */
28 unsigned int rpc_debug;
29 EXPORT_SYMBOL_GPL(rpc_debug);
30
31 unsigned int nfs_debug;
32 EXPORT_SYMBOL_GPL(nfs_debug);
33
34 unsigned int nfsd_debug;
35 EXPORT_SYMBOL_GPL(nfsd_debug);
36
37 unsigned int nlm_debug;
38 EXPORT_SYMBOL_GPL(nlm_debug);
39
40 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
41
42 static struct ctl_table_header *sunrpc_table_header;
43 static struct ctl_table sunrpc_table[];
44
45 void
46 rpc_register_sysctl(void)
47 {
48 if (!sunrpc_table_header)
49 sunrpc_table_header = register_sysctl_table(sunrpc_table);
50 }
51
52 void
53 rpc_unregister_sysctl(void)
54 {
55 if (sunrpc_table_header) {
56 unregister_sysctl_table(sunrpc_table_header);
57 sunrpc_table_header = NULL;
58 }
59 }
60
61 static 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
75 static int
76 proc_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(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
132 done:
133 *lenp -= left;
134 *ppos += *lenp;
135 return 0;
136 }
137
138
139 static 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
177 static struct ctl_table sunrpc_table[] = {
178 {
179 .procname = "sunrpc",
180 .mode = 0555,
181 .child = debug_table
182 },
183 { }
184 };
185
186 #endif
187
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