OpenWrt – Rev 4

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/*
 *  Atheros AR71xx minimal nvram support
 *
 *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/etherdevice.h>

#include "nvram.h"

char *ath79_nvram_find_var(const char *name, const char *buf, unsigned buf_len)
{
        unsigned len = strlen(name);
        char *cur, *last;

        if (buf_len == 0 || len == 0)
                return NULL;

        if (buf_len < len)
                return NULL;

        if (len == 1)
                return memchr(buf, (int) *name, buf_len);

        last = (char *) buf + buf_len - len;
        for (cur = (char *) buf; cur <= last; cur++)
                if (cur[0] == name[0] && memcmp(cur, name, len) == 0)
                        return cur + len;

        return NULL;
}

int ath79_nvram_parse_mac_addr(const char *nvram, unsigned nvram_len,
                               const char *name, char *mac)
{
        char *buf;
        char *mac_str;
        int ret;
        int t;

        buf = vmalloc(nvram_len);
        if (!buf)
                return -ENOMEM;

        memcpy(buf, nvram, nvram_len);
        buf[nvram_len - 1] = '\0';

        mac_str = ath79_nvram_find_var(name, buf, nvram_len);
        if (!mac_str) {
                ret = -EINVAL;
                goto free;
        }

        if (strlen(mac_str) == 19 && mac_str[0] == '"' && mac_str[18] == '"') {
                mac_str[18] = 0;
                mac_str++;
        }

        t = sscanf(mac_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
                   &mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5]);

        if (t != ETH_ALEN)
                t = sscanf(mac_str, "%02hhx-%02hhx-%02hhx-%02hhx-%02hhx-%02hhx",
                        &mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5]);

        if (t != ETH_ALEN) {
                ret = -EINVAL;
                goto free;
        }

        ret = 0;

free:
        vfree(buf);
        return ret;
}