Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
7c0f6ba6 | 18 | #include <linux/uaccess.h> |
1da177e4 LT |
19 | #include <linux/sunrpc/types.h> |
20 | #include <linux/sunrpc/sched.h> | |
21 | #include <linux/sunrpc/stats.h> | |
dc9a16e4 | 22 | #include <linux/sunrpc/svc_xprt.h> |
1da177e4 | 23 | |
70abc49b SK |
24 | #include "netns.h" |
25 | ||
1da177e4 LT |
26 | /* |
27 | * Declare the debug flags here | |
28 | */ | |
29 | unsigned int rpc_debug; | |
e8914c65 | 30 | EXPORT_SYMBOL_GPL(rpc_debug); |
a6eaf8bd | 31 | |
1da177e4 | 32 | unsigned int nfs_debug; |
e8914c65 | 33 | EXPORT_SYMBOL_GPL(nfs_debug); |
a6eaf8bd | 34 | |
1da177e4 | 35 | unsigned int nfsd_debug; |
e8914c65 | 36 | EXPORT_SYMBOL_GPL(nfsd_debug); |
a6eaf8bd | 37 | |
1da177e4 | 38 | unsigned int nlm_debug; |
e8914c65 | 39 | EXPORT_SYMBOL_GPL(nlm_debug); |
1da177e4 | 40 | |
f895b252 | 41 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
42 | |
43 | static struct ctl_table_header *sunrpc_table_header; | |
fe2c6338 | 44 | static struct ctl_table sunrpc_table[]; |
1da177e4 LT |
45 | |
46 | void | |
47 | rpc_register_sysctl(void) | |
48 | { | |
2b1bec5f | 49 | if (!sunrpc_table_header) |
0b4d4147 | 50 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
1da177e4 LT |
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 | ||
fe2c6338 | 62 | static int proc_do_xprt(struct ctl_table *table, int write, |
dc9a16e4 TT |
63 | void __user *buffer, size_t *lenp, loff_t *ppos) |
64 | { | |
65 | char tmpbuf[256]; | |
27df6f25 CG |
66 | size_t len; |
67 | ||
dc9a16e4 TT |
68 | if ((*ppos && !write) || !*lenp) { |
69 | *lenp = 0; | |
70 | return 0; | |
71 | } | |
27df6f25 CG |
72 | len = svc_print_xprts(tmpbuf, sizeof(tmpbuf)); |
73 | return simple_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len); | |
dc9a16e4 TT |
74 | } |
75 | ||
1da177e4 | 76 | static int |
fe2c6338 | 77 | proc_dodebug(struct ctl_table *table, int write, |
1da177e4 LT |
78 | void __user *buffer, size_t *lenp, loff_t *ppos) |
79 | { | |
941c3ff3 | 80 | char tmpbuf[20], c, *s = NULL; |
1da177e4 LT |
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) { | |
96d4f267 | 93 | if (!access_ok(buffer, left)) |
1da177e4 LT |
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 | ||
941c3ff3 KM |
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; | |
1da177e4 LT |
116 | *(unsigned int *) table->data = value; |
117 | /* Display the RPC tasks on writing to rpc_debug */ | |
bc2a3f86 | 118 | if (strcmp(table->procname, "rpc_debug") == 0) |
70abc49b | 119 | rpc_show_tasks(&init_net); |
1da177e4 | 120 | } else { |
941c3ff3 | 121 | len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data); |
1da177e4 LT |
122 | if (len > left) |
123 | len = left; | |
941c3ff3 | 124 | if (copy_to_user(buffer, tmpbuf, len)) |
1da177e4 LT |
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 | ||
133 | done: | |
134 | *lenp -= left; | |
135 | *ppos += *lenp; | |
136 | return 0; | |
137 | } | |
138 | ||
a246b010 | 139 | |
fe2c6338 | 140 | static struct ctl_table debug_table[] = { |
1da177e4 | 141 | { |
1da177e4 LT |
142 | .procname = "rpc_debug", |
143 | .data = &rpc_debug, | |
144 | .maxlen = sizeof(int), | |
145 | .mode = 0644, | |
6d456111 | 146 | .proc_handler = proc_dodebug |
cca5172a | 147 | }, |
1da177e4 | 148 | { |
1da177e4 LT |
149 | .procname = "nfs_debug", |
150 | .data = &nfs_debug, | |
151 | .maxlen = sizeof(int), | |
152 | .mode = 0644, | |
6d456111 | 153 | .proc_handler = proc_dodebug |
cca5172a | 154 | }, |
1da177e4 | 155 | { |
1da177e4 LT |
156 | .procname = "nfsd_debug", |
157 | .data = &nfsd_debug, | |
158 | .maxlen = sizeof(int), | |
159 | .mode = 0644, | |
6d456111 | 160 | .proc_handler = proc_dodebug |
cca5172a | 161 | }, |
1da177e4 | 162 | { |
1da177e4 LT |
163 | .procname = "nlm_debug", |
164 | .data = &nlm_debug, | |
165 | .maxlen = sizeof(int), | |
166 | .mode = 0644, | |
6d456111 | 167 | .proc_handler = proc_dodebug |
cca5172a | 168 | }, |
dc9a16e4 TT |
169 | { |
170 | .procname = "transports", | |
171 | .maxlen = 256, | |
172 | .mode = 0444, | |
6d456111 | 173 | .proc_handler = proc_do_xprt, |
dc9a16e4 | 174 | }, |
f8572d8f | 175 | { } |
1da177e4 LT |
176 | }; |
177 | ||
fe2c6338 | 178 | static struct ctl_table sunrpc_table[] = { |
1da177e4 | 179 | { |
1da177e4 LT |
180 | .procname = "sunrpc", |
181 | .mode = 0555, | |
182 | .child = debug_table | |
183 | }, | |
f8572d8f | 184 | { } |
1da177e4 LT |
185 | }; |
186 | ||
187 | #endif |