c170240d3e
Since dev_add_param_enum is passed a pointer containing the actual value it can contain an invalid value. Protect against it so that we do not access invalid array elements. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
802 lines
17 KiB
C
802 lines
17 KiB
C
/*
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* parameter.c - device parameters
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*
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* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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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 version 2
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* as published by the Free Software Foundation.
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*
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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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*
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*/
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/**
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* @file
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* @brief Handling device specific parameters
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*/
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#include <common.h>
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#include <param.h>
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#include <errno.h>
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#include <net.h>
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#include <malloc.h>
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#include <driver.h>
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#include <linux/err.h>
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struct param_d *get_param_by_name(struct device_d *dev, const char *name)
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{
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struct param_d *p;
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list_for_each_entry(p, &dev->parameters, list) {
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if (!strcmp(p->name, name))
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return p;
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}
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return NULL;
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}
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/**
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* dev_get_param - get the value of a parameter
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* @param dev The device
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* @param name The name of the parameter
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* @return The value
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*/
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const char *dev_get_param(struct device_d *dev, const char *name)
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{
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struct param_d *param = get_param_by_name(dev, name);
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if (!param) {
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errno = EINVAL;
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return NULL;
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}
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return param->get(dev, param);
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}
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/**
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* dev_set_param - set a parameter of a device to a new value
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* @param dev The device
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* @param name The name of the parameter
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* @param val The new value of the parameter
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*/
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int dev_set_param(struct device_d *dev, const char *name, const char *val)
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{
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struct param_d *param;
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int ret;
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if (!dev) {
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errno = ENODEV;
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return -ENODEV;
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}
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param = get_param_by_name(dev, name);
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if (!param) {
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errno = EINVAL;
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return -EINVAL;
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}
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if (param->flags & PARAM_FLAG_RO) {
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errno = EACCES;
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return -EACCES;
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}
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ret = param->set(dev, param, val);
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if (ret)
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errno = -ret;
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return ret;
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}
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/**
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* dev_param_set_generic - generic setter function for a parameter
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* @param dev The device
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* @param p the parameter
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* @param val The new value
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*
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* If used the value of a parameter is a string allocated with
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* malloc and freed with free. If val is NULL the value is freed. This is
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* used during deregistration of the parameter to free the alloctated
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* memory.
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*/
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int dev_param_set_generic(struct device_d *dev, struct param_d *p,
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const char *val)
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{
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free(p->value);
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if (!val) {
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p->value = NULL;
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return 0;
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}
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p->value = strdup(val);
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return p->value ? 0 : -ENOMEM;
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}
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static const char *param_get_generic(struct device_d *dev, struct param_d *p)
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{
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return p->value ? p->value : "";
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}
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static int compare(struct list_head *a, struct list_head *b)
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{
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char *na = (char*)list_entry(a, struct param_d, list)->name;
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char *nb = (char*)list_entry(b, struct param_d, list)->name;
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return strcmp(na, nb);
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}
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static int __dev_add_param(struct param_d *param, struct device_d *dev, const char *name,
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int (*set)(struct device_d *dev, struct param_d *p, const char *val),
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const char *(*get)(struct device_d *dev, struct param_d *p),
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unsigned long flags)
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{
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if (get_param_by_name(dev, name))
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return -EEXIST;
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param->name = strdup(name);
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if (!param->name)
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return -ENOMEM;
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if (set)
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param->set = set;
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else
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param->set = dev_param_set_generic;
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if (get)
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param->get = get;
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else
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param->get = param_get_generic;
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param->flags = flags;
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param->dev = dev;
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list_add_sort(¶m->list, &dev->parameters, compare);
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return 0;
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}
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/**
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* dev_add_param - add a parameter to a device
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* @param dev The device
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* @param name The name of the parameter
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* @param set setter function for the parameter
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* @param get getter function for the parameter
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* @param flags
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*
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* This function adds a new parameter to a device. The get/set functions can
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* be zero in which case the generic functions are used. The generic functions
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* expect the parameter value to be a string which can be freed with free(). Do
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* not use static arrays when using the generic functions.
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*/
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struct param_d *dev_add_param(struct device_d *dev, const char *name,
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int (*set)(struct device_d *dev, struct param_d *p, const char *val),
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const char *(*get)(struct device_d *dev, struct param_d *param),
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unsigned long flags)
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{
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struct param_d *param;
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int ret;
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param = xzalloc(sizeof(*param));
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ret = __dev_add_param(param, dev, name, set, get, flags);
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if (ret) {
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free(param);
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return ERR_PTR(ret);
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}
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return param;
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}
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/**
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* dev_add_param_fixed - add a readonly parameter to a device
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* @param dev The device
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* @param name The name of the parameter
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* @param value The value of the parameter
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*/
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int dev_add_param_fixed(struct device_d *dev, const char *name, const char *value)
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{
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struct param_d *param;
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int ret;
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param = xzalloc(sizeof(*param));
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ret = __dev_add_param(param, dev, name, NULL, NULL, PARAM_FLAG_RO);
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if (ret) {
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free(param);
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return ret;
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}
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param->value = strdup(value);
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return 0;
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}
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struct param_string {
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struct param_d param;
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char **value;
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int (*set)(struct param_d *p, void *priv);
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int (*get)(struct param_d *p, void *priv);
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};
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static inline struct param_string *to_param_string(struct param_d *p)
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{
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return container_of(p, struct param_string, param);
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}
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static int param_string_set(struct device_d *dev, struct param_d *p, const char *val)
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{
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struct param_string *ps = to_param_string(p);
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int ret;
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char *value_save = *ps->value;
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if (!val)
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val = "";
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*ps->value = xstrdup(val);
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if (!ps->set)
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return 0;
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ret = ps->set(p, p->driver_priv);
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if (ret) {
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free(*ps->value);
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*ps->value = value_save;
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} else {
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free(value_save);
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}
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return ret;
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}
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static const char *param_string_get(struct device_d *dev, struct param_d *p)
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{
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struct param_string *ps = to_param_string(p);
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int ret;
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if (ps->get) {
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ret = ps->get(p, p->driver_priv);
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if (ret)
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return NULL;
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}
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return *ps->value;
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}
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struct param_d *dev_add_param_string(struct device_d *dev, const char *name,
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int (*set)(struct param_d *p, void *priv),
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int (*get)(struct param_d *p, void *priv),
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char **value, void *priv)
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{
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struct param_string *ps;
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struct param_d *p;
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int ret;
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ps = xzalloc(sizeof(*ps));
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ps->value = value;
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ps->set = set;
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ps->get = get;
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p = &ps->param;
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p->driver_priv = priv;
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ret = __dev_add_param(p, dev, name, param_string_set, param_string_get, 0);
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if (ret) {
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free(ps);
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return ERR_PTR(ret);
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}
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return &ps->param;
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}
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struct param_int {
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struct param_d param;
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int *value;
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const char *format;
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#define PARAM_INT_FLAG_BOOL (1 << 0)
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unsigned flags;
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int (*set)(struct param_d *p, void *priv);
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int (*get)(struct param_d *p, void *priv);
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};
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static inline struct param_int *to_param_int(struct param_d *p)
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{
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return container_of(p, struct param_int, param);
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}
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static int param_int_set(struct device_d *dev, struct param_d *p, const char *val)
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{
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struct param_int *pi = to_param_int(p);
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int value_save = *pi->value;
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int ret;
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if (!val)
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return -EINVAL;
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*pi->value = simple_strtol(val, NULL, 0);
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if (pi->flags & PARAM_INT_FLAG_BOOL)
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*pi->value = !!*pi->value;
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if (!pi->set)
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return 0;
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ret = pi->set(p, p->driver_priv);
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if (ret)
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*pi->value = value_save;
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return ret;
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}
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static const char *param_int_get(struct device_d *dev, struct param_d *p)
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{
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struct param_int *pi = to_param_int(p);
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int ret;
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if (pi->get) {
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ret = pi->get(p, p->driver_priv);
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if (ret)
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return NULL;
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}
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free(p->value);
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p->value = asprintf(pi->format, *pi->value);
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return p->value;
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}
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/**
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* dev_add_param_int - add an integer parameter to a device
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* @param dev The device
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* @param name The name of the parameter
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* @param set set function
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* @param get get function
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* @param value pointer to the integer containing the value of the parameter
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* @param format the printf format used to print the value
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* @param priv user private data, will be passed to get/set
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*
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* The get function can be used as a notifier when the variable is about
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* to be read.
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* The set function can be used as a notifer when the variable is about
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* to be written. Can also be used to limit the value.
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*/
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struct param_d *dev_add_param_int(struct device_d *dev, const char *name,
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int (*set)(struct param_d *p, void *priv),
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int (*get)(struct param_d *p, void *priv),
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int *value, const char *format, void *priv)
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{
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struct param_int *pi;
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struct param_d *p;
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int ret;
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pi = xzalloc(sizeof(*pi));
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pi->value = value;
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pi->format = format;
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pi->set = set;
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pi->get = get;
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p = &pi->param;
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p->driver_priv = priv;
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ret = __dev_add_param(p, dev, name, param_int_set, param_int_get, 0);
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if (ret) {
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free(pi);
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return ERR_PTR(ret);
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}
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return &pi->param;
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}
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struct param_enum {
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struct param_d param;
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unsigned int *value;
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const char * const *names;
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int num_names;
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int (*set)(struct param_d *p, void *priv);
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int (*get)(struct param_d *p, void *priv);
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};
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static inline struct param_enum *to_param_enum(struct param_d *p)
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{
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return container_of(p, struct param_enum, param);
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}
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static int param_enum_set(struct device_d *dev, struct param_d *p, const char *val)
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{
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struct param_enum *pe = to_param_enum(p);
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int value_save = *pe->value;
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int i, ret;
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if (!val)
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return -EINVAL;
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for (i = 0; i < pe->num_names; i++)
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if (pe->names[i] && !strcmp(val, pe->names[i]))
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break;
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if (i == pe->num_names)
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return -EINVAL;
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*pe->value = i;
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if (!pe->set)
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return 0;
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ret = pe->set(p, p->driver_priv);
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if (ret)
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*pe->value = value_save;
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return ret;
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}
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static const char *param_enum_get(struct device_d *dev, struct param_d *p)
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{
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struct param_enum *pe = to_param_enum(p);
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int ret;
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if (pe->get) {
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ret = pe->get(p, p->driver_priv);
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if (ret)
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return NULL;
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}
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free(p->value);
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if (*pe->value >= pe->num_names)
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p->value = asprintf("invalid:%d", *pe->value);
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else
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p->value = strdup(pe->names[*pe->value]);
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return p->value;
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}
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static void param_enum_info(struct param_d *p)
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{
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struct param_enum *pe = to_param_enum(p);
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int i;
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if (pe->num_names <= 1)
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return;
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printf(" (");
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for (i = 0; i < pe->num_names; i++) {
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if (!pe->names[i] || !*pe->names[i])
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continue;
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printf("\"%s\"%s", pe->names[i],
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i == pe->num_names - 1 ? ")" : ", ");
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}
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}
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struct param_d *dev_add_param_enum(struct device_d *dev, const char *name,
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int (*set)(struct param_d *p, void *priv),
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int (*get)(struct param_d *p, void *priv),
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int *value, const char * const *names, int num_names, void *priv)
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{
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struct param_enum *pe;
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struct param_d *p;
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int ret;
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pe = xzalloc(sizeof(*pe));
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pe->value = value;
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pe->set = set;
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pe->get = get;
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pe->names = names;
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pe->num_names = num_names;
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p = &pe->param;
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p->driver_priv = priv;
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ret = __dev_add_param(p, dev, name, param_enum_set, param_enum_get, 0);
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if (ret) {
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free(pe);
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return ERR_PTR(ret);
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}
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p->info = param_enum_info;
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return &pe->param;
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}
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/**
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* dev_add_param_bool - add an boolean parameter to a device
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* @param dev The device
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* @param name The name of the parameter
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* @param set set function
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* @param get get function
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* @param value pointer to the integer containing the value of the parameter
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* @param priv user private data, will be passed to get/set
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*
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* The get function can be used as a notifier when the variable is about
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* to be read.
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* The set function can be used as a notifer when the variable is about
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* to be written. Can also be used to limit the value.
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*/
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struct param_d *dev_add_param_bool(struct device_d *dev, const char *name,
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int (*set)(struct param_d *p, void *priv),
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int (*get)(struct param_d *p, void *priv),
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int *value, void *priv)
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{
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struct param_int *pi;
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struct param_d *p;
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p = dev_add_param_int(dev, name, set, get, value, "%d", priv);
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if (IS_ERR(p))
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return p;
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pi = to_param_int(p);
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pi->flags |= PARAM_INT_FLAG_BOOL;
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return p;
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}
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struct param_int_ro {
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struct param_d param;
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char *value;
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};
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/**
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* dev_add_param_int_ro - add a read only integer parameter to a device
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* @param dev The device
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* @param name The name of the parameter
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* @param value The value of the parameter
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* @param format the printf format used to print the value
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*/
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struct param_d *dev_add_param_int_ro(struct device_d *dev, const char *name,
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int value, const char *format)
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{
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struct param_int *piro;
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int ret;
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piro = xzalloc(sizeof(*piro));
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ret = __dev_add_param(&piro->param, dev, name, NULL, NULL, 0);
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if (ret) {
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free(piro);
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return ERR_PTR(ret);
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}
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piro->param.value = asprintf(format, value);
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return &piro->param;
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}
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/**
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* dev_add_param_llint_ro - add a read only long long parameter to a device
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* @param dev The device
|
|
* @param name The name of the parameter
|
|
* @param value The value of the parameter
|
|
* @param format the printf format used to print the value
|
|
*/
|
|
struct param_d *dev_add_param_llint_ro(struct device_d *dev, const char *name,
|
|
long long value, const char *format)
|
|
{
|
|
struct param_int *piro;
|
|
int ret;
|
|
|
|
piro = xzalloc(sizeof(*piro));
|
|
|
|
ret = __dev_add_param(&piro->param, dev, name, NULL, NULL, 0);
|
|
if (ret) {
|
|
free(piro);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
piro->param.value = asprintf(format, value);
|
|
|
|
return &piro->param;
|
|
}
|
|
|
|
struct param_ip {
|
|
struct param_d param;
|
|
IPaddr_t *ip;
|
|
const char *format;
|
|
int (*set)(struct param_d *p, void *priv);
|
|
int (*get)(struct param_d *p, void *priv);
|
|
};
|
|
|
|
static inline struct param_ip *to_param_ip(struct param_d *p)
|
|
{
|
|
return container_of(p, struct param_ip, param);
|
|
}
|
|
|
|
static int param_ip_set(struct device_d *dev, struct param_d *p, const char *val)
|
|
{
|
|
struct param_ip *pi = to_param_ip(p);
|
|
IPaddr_t ip_save = *pi->ip;
|
|
int ret;
|
|
|
|
if (!val)
|
|
return -EINVAL;
|
|
|
|
ret = string_to_ip(val, pi->ip);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!pi->set)
|
|
return 0;
|
|
|
|
ret = pi->set(p, p->driver_priv);
|
|
if (ret)
|
|
*pi->ip = ip_save;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const char *param_ip_get(struct device_d *dev, struct param_d *p)
|
|
{
|
|
struct param_ip *pi = to_param_ip(p);
|
|
int ret;
|
|
|
|
if (pi->get) {
|
|
ret = pi->get(p, p->driver_priv);
|
|
if (ret)
|
|
return NULL;
|
|
}
|
|
|
|
free(p->value);
|
|
p->value = xstrdup(ip_to_string(*pi->ip));
|
|
|
|
return p->value;
|
|
}
|
|
|
|
struct param_d *dev_add_param_ip(struct device_d *dev, const char *name,
|
|
int (*set)(struct param_d *p, void *priv),
|
|
int (*get)(struct param_d *p, void *priv),
|
|
IPaddr_t *ip, void *priv)
|
|
{
|
|
struct param_ip *pi;
|
|
int ret;
|
|
|
|
pi = xzalloc(sizeof(*pi));
|
|
pi->ip = ip;
|
|
pi->set = set;
|
|
pi->get = get;
|
|
pi->param.driver_priv = priv;
|
|
|
|
ret = __dev_add_param(&pi->param, dev, name,
|
|
param_ip_set, param_ip_get, 0);
|
|
if (ret) {
|
|
free(pi);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return &pi->param;
|
|
}
|
|
|
|
struct param_mac {
|
|
struct param_d param;
|
|
char *mac;
|
|
u8 mac_str[sizeof("xx:xx:xx:xx:xx:xx")];
|
|
const char *format;
|
|
int (*set)(struct param_d *p, void *priv);
|
|
int (*get)(struct param_d *p, void *priv);
|
|
};
|
|
|
|
int string_to_ethaddr(const char *str, u8 enetaddr[6]);
|
|
void ethaddr_to_string(const u8 enetaddr[6], char *str);
|
|
|
|
static inline struct param_mac *to_param_mac(struct param_d *p)
|
|
{
|
|
return container_of(p, struct param_mac, param);
|
|
}
|
|
|
|
static int param_mac_set(struct device_d *dev, struct param_d *p, const char *val)
|
|
{
|
|
struct param_mac *pm = to_param_mac(p);
|
|
char mac_save[6];
|
|
int ret;
|
|
|
|
if (!val)
|
|
return -EINVAL;
|
|
|
|
memcpy(mac_save, pm->mac, 6);
|
|
|
|
ret = string_to_ethaddr(val, pm->mac);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (!pm->set)
|
|
return 0;
|
|
|
|
ret = pm->set(p, p->driver_priv);
|
|
if (ret)
|
|
goto out;
|
|
|
|
return 0;
|
|
out:
|
|
memcpy(pm->mac, mac_save, 6);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const char *param_mac_get(struct device_d *dev, struct param_d *p)
|
|
{
|
|
struct param_mac *pm = to_param_mac(p);
|
|
int ret;
|
|
|
|
if (pm->get) {
|
|
ret = pm->get(p, p->driver_priv);
|
|
if (ret)
|
|
return NULL;
|
|
}
|
|
|
|
ethaddr_to_string(pm->mac, p->value);
|
|
|
|
return p->value;
|
|
}
|
|
|
|
struct param_d *dev_add_param_mac(struct device_d *dev, const char *name,
|
|
int (*set)(struct param_d *p, void *priv),
|
|
int (*get)(struct param_d *p, void *priv),
|
|
u8 *mac, void *priv)
|
|
{
|
|
struct param_mac *pm;
|
|
int ret;
|
|
|
|
pm = xzalloc(sizeof(*pm));
|
|
pm->mac = mac;
|
|
pm->set = set;
|
|
pm->get = get;
|
|
pm->param.driver_priv = priv;
|
|
pm->param.value = pm->mac_str;
|
|
|
|
ret = __dev_add_param(&pm->param, dev, name,
|
|
param_mac_set, param_mac_get, 0);
|
|
if (ret) {
|
|
free(pm);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return &pm->param;
|
|
}
|
|
|
|
/**
|
|
* dev_remove_param - remove a parameter from a device and free its
|
|
* memory
|
|
* @param p The parameter
|
|
*/
|
|
void dev_remove_param(struct param_d *p)
|
|
{
|
|
p->set(p->dev, p, NULL);
|
|
list_del(&p->list);
|
|
free(p->name);
|
|
free(p);
|
|
}
|
|
|
|
/**
|
|
* dev_remove_parameters - remove all parameters from a device and free their
|
|
* memory
|
|
* @param dev The device
|
|
*/
|
|
void dev_remove_parameters(struct device_d *dev)
|
|
{
|
|
struct param_d *p, *n;
|
|
|
|
list_for_each_entry_safe(p, n, &dev->parameters, list) {
|
|
p->set(dev, p, NULL);
|
|
list_del(&p->list);
|
|
free(p->name);
|
|
free(p);
|
|
}
|
|
}
|
|
|
|
/** @page dev_params Device parameters
|
|
|
|
@section params_devices Devices can have several parameters.
|
|
|
|
In case of a network device this may be the IP address, networking mask or
|
|
similar and users need access to these parameters. In barebox this is solved
|
|
with device paramters. Device parameters are always strings, although there
|
|
are functions to interpret them as something else. 'hush' users can access
|
|
parameters as a local variable which have a dot (.) in them. So setting the
|
|
IP address of the first ethernet device is a matter of typing
|
|
'eth0.ipaddr=192.168.0.7' on the console and can then be read back with
|
|
'echo $eth0.ipaddr'. The @ref devinfo_command command shows a summary about all
|
|
devices currently present. If called with a device id as parameter it shows the
|
|
parameters available for a device.
|
|
|
|
See the individual functions for parameter programming.
|
|
|
|
*/
|