31143a1204
there seems to be a bug, at least for me, in kernel/param.c for arrays with
.num == NULL. If .num == NULL, the function param_array_set() uses &.max
for the call to param_array(), wich alters the .max value to the number of
arguments. The result is, you can't set more array arguments as the last
time you set the parameter.
example:
# a module 'example' with
# static int array[10] = { 0, };
# module_param_array(array, int, NULL, 0644);
$ insmod example.ko array=1,2,3
$ cat /sys/module/example/parameters/array
1,2,3
$ echo "4,3,2,1" > /sys/module/example/parameters/array
$ dmesg | tail -n 1
kernel: array: can take only 3 arguments
Signed-off-by: Bert Wesarg <wesarg@informatik.uni-halle.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
723 lines
17 KiB
C
723 lines
17 KiB
C
/* Helpers for initial module or kernel cmdline parsing
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Copyright (C) 2001 Rusty Russell.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/config.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(fmt, a...)
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#endif
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static inline int dash2underscore(char c)
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{
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if (c == '-')
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return '_';
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return c;
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}
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static inline int parameq(const char *input, const char *paramname)
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{
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unsigned int i;
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for (i = 0; dash2underscore(input[i]) == paramname[i]; i++)
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if (input[i] == '\0')
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return 1;
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return 0;
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}
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static int parse_one(char *param,
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char *val,
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struct kernel_param *params,
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unsigned num_params,
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int (*handle_unknown)(char *param, char *val))
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{
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unsigned int i;
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/* Find parameter */
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for (i = 0; i < num_params; i++) {
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if (parameq(param, params[i].name)) {
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DEBUGP("They are equal! Calling %p\n",
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params[i].set);
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return params[i].set(val, ¶ms[i]);
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}
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}
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if (handle_unknown) {
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DEBUGP("Unknown argument: calling %p\n", handle_unknown);
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return handle_unknown(param, val);
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}
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DEBUGP("Unknown argument `%s'\n", param);
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return -ENOENT;
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}
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/* You can use " around spaces, but can't escape ". */
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/* Hyphens and underscores equivalent in parameter names. */
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static char *next_arg(char *args, char **param, char **val)
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{
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unsigned int i, equals = 0;
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int in_quote = 0, quoted = 0;
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char *next;
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/* Chew any extra spaces */
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while (*args == ' ') args++;
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if (*args == '"') {
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args++;
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in_quote = 1;
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quoted = 1;
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}
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for (i = 0; args[i]; i++) {
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if (args[i] == ' ' && !in_quote)
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break;
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if (equals == 0) {
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if (args[i] == '=')
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equals = i;
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}
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if (args[i] == '"')
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in_quote = !in_quote;
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}
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*param = args;
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if (!equals)
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*val = NULL;
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else {
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args[equals] = '\0';
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*val = args + equals + 1;
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/* Don't include quotes in value. */
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if (**val == '"') {
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(*val)++;
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if (args[i-1] == '"')
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args[i-1] = '\0';
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}
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if (quoted && args[i-1] == '"')
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args[i-1] = '\0';
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}
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if (args[i]) {
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args[i] = '\0';
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next = args + i + 1;
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} else
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next = args + i;
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return next;
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}
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/* Args looks like "foo=bar,bar2 baz=fuz wiz". */
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int parse_args(const char *name,
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char *args,
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struct kernel_param *params,
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unsigned num,
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int (*unknown)(char *param, char *val))
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{
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char *param, *val;
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DEBUGP("Parsing ARGS: %s\n", args);
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while (*args) {
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int ret;
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args = next_arg(args, ¶m, &val);
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ret = parse_one(param, val, params, num, unknown);
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switch (ret) {
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case -ENOENT:
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printk(KERN_ERR "%s: Unknown parameter `%s'\n",
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name, param);
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return ret;
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case -ENOSPC:
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printk(KERN_ERR
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"%s: `%s' too large for parameter `%s'\n",
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name, val ?: "", param);
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return ret;
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case 0:
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break;
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default:
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printk(KERN_ERR
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"%s: `%s' invalid for parameter `%s'\n",
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name, val ?: "", param);
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return ret;
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}
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}
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/* All parsed OK. */
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return 0;
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}
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/* Lazy bastard, eh? */
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#define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \
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int param_set_##name(const char *val, struct kernel_param *kp) \
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{ \
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char *endp; \
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tmptype l; \
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\
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if (!val) return -EINVAL; \
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l = strtolfn(val, &endp, 0); \
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if (endp == val || ((type)l != l)) \
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return -EINVAL; \
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*((type *)kp->arg) = l; \
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return 0; \
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} \
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int param_get_##name(char *buffer, struct kernel_param *kp) \
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{ \
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return sprintf(buffer, format, *((type *)kp->arg)); \
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}
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STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, simple_strtoul);
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STANDARD_PARAM_DEF(short, short, "%hi", long, simple_strtol);
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STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, simple_strtoul);
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STANDARD_PARAM_DEF(int, int, "%i", long, simple_strtol);
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STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, simple_strtoul);
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STANDARD_PARAM_DEF(long, long, "%li", long, simple_strtol);
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STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, simple_strtoul);
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int param_set_charp(const char *val, struct kernel_param *kp)
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{
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if (!val) {
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printk(KERN_ERR "%s: string parameter expected\n",
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kp->name);
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return -EINVAL;
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}
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if (strlen(val) > 1024) {
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printk(KERN_ERR "%s: string parameter too long\n",
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kp->name);
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return -ENOSPC;
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}
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*(char **)kp->arg = (char *)val;
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return 0;
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}
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int param_get_charp(char *buffer, struct kernel_param *kp)
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{
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return sprintf(buffer, "%s", *((char **)kp->arg));
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}
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int param_set_bool(const char *val, struct kernel_param *kp)
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{
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/* No equals means "set"... */
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if (!val) val = "1";
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/* One of =[yYnN01] */
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switch (val[0]) {
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case 'y': case 'Y': case '1':
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*(int *)kp->arg = 1;
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return 0;
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case 'n': case 'N': case '0':
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*(int *)kp->arg = 0;
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return 0;
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}
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return -EINVAL;
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}
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int param_get_bool(char *buffer, struct kernel_param *kp)
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{
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/* Y and N chosen as being relatively non-coder friendly */
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return sprintf(buffer, "%c", (*(int *)kp->arg) ? 'Y' : 'N');
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}
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int param_set_invbool(const char *val, struct kernel_param *kp)
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{
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int boolval, ret;
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struct kernel_param dummy = { .arg = &boolval };
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ret = param_set_bool(val, &dummy);
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if (ret == 0)
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*(int *)kp->arg = !boolval;
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return ret;
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}
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int param_get_invbool(char *buffer, struct kernel_param *kp)
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{
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int val;
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struct kernel_param dummy = { .arg = &val };
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val = !*(int *)kp->arg;
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return param_get_bool(buffer, &dummy);
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}
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/* We cheat here and temporarily mangle the string. */
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int param_array(const char *name,
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const char *val,
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unsigned int min, unsigned int max,
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void *elem, int elemsize,
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int (*set)(const char *, struct kernel_param *kp),
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int *num)
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{
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int ret;
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struct kernel_param kp;
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char save;
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/* Get the name right for errors. */
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kp.name = name;
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kp.arg = elem;
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/* No equals sign? */
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if (!val) {
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printk(KERN_ERR "%s: expects arguments\n", name);
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return -EINVAL;
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}
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*num = 0;
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/* We expect a comma-separated list of values. */
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do {
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int len;
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if (*num == max) {
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printk(KERN_ERR "%s: can only take %i arguments\n",
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name, max);
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return -EINVAL;
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}
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len = strcspn(val, ",");
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/* nul-terminate and parse */
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save = val[len];
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((char *)val)[len] = '\0';
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ret = set(val, &kp);
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if (ret != 0)
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return ret;
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kp.arg += elemsize;
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val += len+1;
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(*num)++;
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} while (save == ',');
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if (*num < min) {
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printk(KERN_ERR "%s: needs at least %i arguments\n",
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name, min);
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return -EINVAL;
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}
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return 0;
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}
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int param_array_set(const char *val, struct kernel_param *kp)
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{
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struct kparam_array *arr = kp->arg;
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unsigned int temp_num;
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return param_array(kp->name, val, 1, arr->max, arr->elem,
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arr->elemsize, arr->set, arr->num ?: &temp_num);
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}
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int param_array_get(char *buffer, struct kernel_param *kp)
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{
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int i, off, ret;
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struct kparam_array *arr = kp->arg;
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struct kernel_param p;
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p = *kp;
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for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) {
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if (i)
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buffer[off++] = ',';
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p.arg = arr->elem + arr->elemsize * i;
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ret = arr->get(buffer + off, &p);
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if (ret < 0)
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return ret;
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off += ret;
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}
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buffer[off] = '\0';
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return off;
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}
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int param_set_copystring(const char *val, struct kernel_param *kp)
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{
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struct kparam_string *kps = kp->arg;
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if (strlen(val)+1 > kps->maxlen) {
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printk(KERN_ERR "%s: string doesn't fit in %u chars.\n",
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kp->name, kps->maxlen-1);
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return -ENOSPC;
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}
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strcpy(kps->string, val);
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return 0;
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}
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int param_get_string(char *buffer, struct kernel_param *kp)
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{
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struct kparam_string *kps = kp->arg;
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return strlcpy(buffer, kps->string, kps->maxlen);
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}
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/* sysfs output in /sys/modules/XYZ/parameters/ */
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extern struct kernel_param __start___param[], __stop___param[];
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#define MAX_KBUILD_MODNAME KOBJ_NAME_LEN
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struct param_attribute
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{
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struct module_attribute mattr;
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struct kernel_param *param;
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};
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struct module_param_attrs
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{
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struct attribute_group grp;
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struct param_attribute attrs[0];
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};
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#define to_param_attr(n) container_of(n, struct param_attribute, mattr);
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static ssize_t param_attr_show(struct module_attribute *mattr,
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struct module *mod, char *buf)
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{
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int count;
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struct param_attribute *attribute = to_param_attr(mattr);
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if (!attribute->param->get)
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return -EPERM;
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count = attribute->param->get(buf, attribute->param);
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if (count > 0) {
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strcat(buf, "\n");
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++count;
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}
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return count;
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}
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/* sysfs always hands a nul-terminated string in buf. We rely on that. */
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static ssize_t param_attr_store(struct module_attribute *mattr,
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struct module *owner,
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const char *buf, size_t len)
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{
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int err;
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struct param_attribute *attribute = to_param_attr(mattr);
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if (!attribute->param->set)
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return -EPERM;
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err = attribute->param->set(buf, attribute->param);
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if (!err)
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return len;
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return err;
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}
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#ifdef CONFIG_MODULES
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#define __modinit
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#else
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#define __modinit __init
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#endif
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/*
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* param_sysfs_setup - setup sysfs support for one module or KBUILD_MODNAME
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* @mk: struct module_kobject (contains parent kobject)
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* @kparam: array of struct kernel_param, the actual parameter definitions
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* @num_params: number of entries in array
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* @name_skip: offset where the parameter name start in kparam[].name. Needed for built-in "modules"
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*
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* Create a kobject for a (per-module) group of parameters, and create files
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* in sysfs. A pointer to the param_kobject is returned on success,
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* NULL if there's no parameter to export, or other ERR_PTR(err).
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*/
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static __modinit struct module_param_attrs *
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param_sysfs_setup(struct module_kobject *mk,
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struct kernel_param *kparam,
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unsigned int num_params,
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unsigned int name_skip)
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{
|
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struct module_param_attrs *mp;
|
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unsigned int valid_attrs = 0;
|
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unsigned int i, size[2];
|
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struct param_attribute *pattr;
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struct attribute **gattr;
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int err;
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|
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for (i=0; i<num_params; i++) {
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if (kparam[i].perm)
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valid_attrs++;
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}
|
|
|
|
if (!valid_attrs)
|
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return NULL;
|
|
|
|
size[0] = ALIGN(sizeof(*mp) +
|
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valid_attrs * sizeof(mp->attrs[0]),
|
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sizeof(mp->grp.attrs[0]));
|
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size[1] = (valid_attrs + 1) * sizeof(mp->grp.attrs[0]);
|
|
|
|
mp = kmalloc(size[0] + size[1], GFP_KERNEL);
|
|
if (!mp)
|
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return ERR_PTR(-ENOMEM);
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|
|
|
mp->grp.name = "parameters";
|
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mp->grp.attrs = (void *)mp + size[0];
|
|
|
|
pattr = &mp->attrs[0];
|
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gattr = &mp->grp.attrs[0];
|
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for (i = 0; i < num_params; i++) {
|
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struct kernel_param *kp = &kparam[i];
|
|
if (kp->perm) {
|
|
pattr->param = kp;
|
|
pattr->mattr.show = param_attr_show;
|
|
pattr->mattr.store = param_attr_store;
|
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pattr->mattr.attr.name = (char *)&kp->name[name_skip];
|
|
pattr->mattr.attr.owner = mk->mod;
|
|
pattr->mattr.attr.mode = kp->perm;
|
|
*(gattr++) = &(pattr++)->mattr.attr;
|
|
}
|
|
}
|
|
*gattr = NULL;
|
|
|
|
if ((err = sysfs_create_group(&mk->kobj, &mp->grp))) {
|
|
kfree(mp);
|
|
return ERR_PTR(err);
|
|
}
|
|
return mp;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_MODULES
|
|
|
|
/*
|
|
* module_param_sysfs_setup - setup sysfs support for one module
|
|
* @mod: module
|
|
* @kparam: module parameters (array)
|
|
* @num_params: number of module parameters
|
|
*
|
|
* Adds sysfs entries for module parameters, and creates a link from
|
|
* /sys/module/[mod->name]/parameters to /sys/parameters/[mod->name]/
|
|
*/
|
|
int module_param_sysfs_setup(struct module *mod,
|
|
struct kernel_param *kparam,
|
|
unsigned int num_params)
|
|
{
|
|
struct module_param_attrs *mp;
|
|
|
|
mp = param_sysfs_setup(&mod->mkobj, kparam, num_params, 0);
|
|
if (IS_ERR(mp))
|
|
return PTR_ERR(mp);
|
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|
|
mod->param_attrs = mp;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* module_param_sysfs_remove - remove sysfs support for one module
|
|
* @mod: module
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|
*
|
|
* Remove sysfs entries for module parameters and the corresponding
|
|
* kobject.
|
|
*/
|
|
void module_param_sysfs_remove(struct module *mod)
|
|
{
|
|
if (mod->param_attrs) {
|
|
sysfs_remove_group(&mod->mkobj.kobj,
|
|
&mod->param_attrs->grp);
|
|
/* We are positive that no one is using any param
|
|
* attrs at this point. Deallocate immediately. */
|
|
kfree(mod->param_attrs);
|
|
mod->param_attrs = NULL;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* kernel_param_sysfs_setup - wrapper for built-in params support
|
|
*/
|
|
static void __init kernel_param_sysfs_setup(const char *name,
|
|
struct kernel_param *kparam,
|
|
unsigned int num_params,
|
|
unsigned int name_skip)
|
|
{
|
|
struct module_kobject *mk;
|
|
|
|
mk = kmalloc(sizeof(struct module_kobject), GFP_KERNEL);
|
|
memset(mk, 0, sizeof(struct module_kobject));
|
|
|
|
mk->mod = THIS_MODULE;
|
|
kobj_set_kset_s(mk, module_subsys);
|
|
kobject_set_name(&mk->kobj, name);
|
|
kobject_register(&mk->kobj);
|
|
|
|
/* no need to keep the kobject if no parameter is exported */
|
|
if (!param_sysfs_setup(mk, kparam, num_params, name_skip)) {
|
|
kobject_unregister(&mk->kobj);
|
|
kfree(mk);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* param_sysfs_builtin - add contents in /sys/parameters for built-in modules
|
|
*
|
|
* Add module_parameters to sysfs for "modules" built into the kernel.
|
|
*
|
|
* The "module" name (KBUILD_MODNAME) is stored before a dot, the
|
|
* "parameter" name is stored behind a dot in kernel_param->name. So,
|
|
* extract the "module" name for all built-in kernel_param-eters,
|
|
* and for all who have the same, call kernel_param_sysfs_setup.
|
|
*/
|
|
static void __init param_sysfs_builtin(void)
|
|
{
|
|
struct kernel_param *kp, *kp_begin = NULL;
|
|
unsigned int i, name_len, count = 0;
|
|
char modname[MAX_KBUILD_MODNAME + 1] = "";
|
|
|
|
for (i=0; i < __stop___param - __start___param; i++) {
|
|
char *dot;
|
|
|
|
kp = &__start___param[i];
|
|
|
|
/* We do not handle args without periods. */
|
|
dot = memchr(kp->name, '.', MAX_KBUILD_MODNAME);
|
|
if (!dot) {
|
|
DEBUGP("couldn't find period in %s\n", kp->name);
|
|
continue;
|
|
}
|
|
name_len = dot - kp->name;
|
|
|
|
/* new kbuild_modname? */
|
|
if (strlen(modname) != name_len
|
|
|| strncmp(modname, kp->name, name_len) != 0) {
|
|
/* add a new kobject for previous kernel_params. */
|
|
if (count)
|
|
kernel_param_sysfs_setup(modname,
|
|
kp_begin,
|
|
count,
|
|
strlen(modname)+1);
|
|
|
|
strncpy(modname, kp->name, name_len);
|
|
modname[name_len] = '\0';
|
|
count = 0;
|
|
kp_begin = kp;
|
|
}
|
|
count++;
|
|
}
|
|
|
|
/* last kernel_params need to be registered as well */
|
|
if (count)
|
|
kernel_param_sysfs_setup(modname, kp_begin, count,
|
|
strlen(modname)+1);
|
|
}
|
|
|
|
|
|
/* module-related sysfs stuff */
|
|
#ifdef CONFIG_MODULES
|
|
|
|
#define to_module_attr(n) container_of(n, struct module_attribute, attr);
|
|
#define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
|
|
|
|
static ssize_t module_attr_show(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct module_attribute *attribute;
|
|
struct module_kobject *mk;
|
|
int ret;
|
|
|
|
attribute = to_module_attr(attr);
|
|
mk = to_module_kobject(kobj);
|
|
|
|
if (!attribute->show)
|
|
return -EPERM;
|
|
|
|
if (!try_module_get(mk->mod))
|
|
return -ENODEV;
|
|
|
|
ret = attribute->show(attribute, mk->mod, buf);
|
|
|
|
module_put(mk->mod);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t module_attr_store(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct module_attribute *attribute;
|
|
struct module_kobject *mk;
|
|
int ret;
|
|
|
|
attribute = to_module_attr(attr);
|
|
mk = to_module_kobject(kobj);
|
|
|
|
if (!attribute->store)
|
|
return -EPERM;
|
|
|
|
if (!try_module_get(mk->mod))
|
|
return -ENODEV;
|
|
|
|
ret = attribute->store(attribute, mk->mod, buf, len);
|
|
|
|
module_put(mk->mod);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct sysfs_ops module_sysfs_ops = {
|
|
.show = module_attr_show,
|
|
.store = module_attr_store,
|
|
};
|
|
|
|
#else
|
|
static struct sysfs_ops module_sysfs_ops = {
|
|
.show = NULL,
|
|
.store = NULL,
|
|
};
|
|
#endif
|
|
|
|
static struct kobj_type module_ktype = {
|
|
.sysfs_ops = &module_sysfs_ops,
|
|
};
|
|
|
|
decl_subsys(module, &module_ktype, NULL);
|
|
|
|
/*
|
|
* param_sysfs_init - wrapper for built-in params support
|
|
*/
|
|
static int __init param_sysfs_init(void)
|
|
{
|
|
subsystem_register(&module_subsys);
|
|
|
|
param_sysfs_builtin();
|
|
|
|
return 0;
|
|
}
|
|
__initcall(param_sysfs_init);
|
|
|
|
EXPORT_SYMBOL(param_set_byte);
|
|
EXPORT_SYMBOL(param_get_byte);
|
|
EXPORT_SYMBOL(param_set_short);
|
|
EXPORT_SYMBOL(param_get_short);
|
|
EXPORT_SYMBOL(param_set_ushort);
|
|
EXPORT_SYMBOL(param_get_ushort);
|
|
EXPORT_SYMBOL(param_set_int);
|
|
EXPORT_SYMBOL(param_get_int);
|
|
EXPORT_SYMBOL(param_set_uint);
|
|
EXPORT_SYMBOL(param_get_uint);
|
|
EXPORT_SYMBOL(param_set_long);
|
|
EXPORT_SYMBOL(param_get_long);
|
|
EXPORT_SYMBOL(param_set_ulong);
|
|
EXPORT_SYMBOL(param_get_ulong);
|
|
EXPORT_SYMBOL(param_set_charp);
|
|
EXPORT_SYMBOL(param_get_charp);
|
|
EXPORT_SYMBOL(param_set_bool);
|
|
EXPORT_SYMBOL(param_get_bool);
|
|
EXPORT_SYMBOL(param_set_invbool);
|
|
EXPORT_SYMBOL(param_get_invbool);
|
|
EXPORT_SYMBOL(param_array_set);
|
|
EXPORT_SYMBOL(param_array_get);
|
|
EXPORT_SYMBOL(param_set_copystring);
|
|
EXPORT_SYMBOL(param_get_string);
|