openwrt/package/nvram/src/wl.c

/*
 * Wireless network adapter utilities
 *
 * Copyright 2004, Broadcom Corporation
 * All Rights Reserved.
 * 
 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
 *
 * $Id$
 */
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <net/if.h>

#include <typedefs.h>
#include <wlutils.h>

int
wl_ioctl(char *name, int cmd, void *buf, int len)
{
	struct ifreq ifr;
	wl_ioctl_t ioc;
	int ret = 0;
 	int s;

	/* open socket to kernel */
	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
		perror("socket");
		return errno;
	}

	/* do it */
	ioc.cmd = cmd;
	ioc.buf = buf;
	ioc.len = len;
	strncpy(ifr.ifr_name, name, IFNAMSIZ);
	ifr.ifr_data = (caddr_t) &ioc;
	if ((ret = ioctl(s, SIOCDEVPRIVATE, &ifr)) < 0)
		if (cmd != WLC_GET_MAGIC)
			perror(ifr.ifr_name);

	/* cleanup */
	close(s);
	return ret;
}

int
wl_hwaddr(char *name, unsigned char *hwaddr)
{
	struct ifreq ifr;
	int ret = 0;
 	int s;

	/* open socket to kernel */
	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
		perror("socket");
		return errno;
	}

	/* do it */
	strncpy(ifr.ifr_name, name, IFNAMSIZ);
	if ((ret = ioctl(s, SIOCGIFHWADDR, &ifr)) == 0)
		memcpy(hwaddr, ifr.ifr_hwaddr.sa_data, ETHER_ADDR_LEN);

	/* cleanup */
	close(s);
	return ret;
}	

int
wl_probe(char *name)
{
	int ret, val;

	/* Check interface */
	if ((ret = wl_ioctl(name, WLC_GET_MAGIC, &val, sizeof(val))))
		return ret;
	if (val != WLC_IOCTL_MAGIC)
		return -1;
	if ((ret = wl_ioctl(name, WLC_GET_VERSION, &val, sizeof(val))))
		return ret;
	if (val > WLC_IOCTL_VERSION)
		return -1;

	return ret;
}

int
wl_set_val(char *name, char *var, void *val, int len)
{
	char buf[128];
	int buf_len;

	/* check for overflow */
	if ((buf_len = strlen(var)) + 1 + len > sizeof(buf))
		return -1;
	
	strcpy(buf, var);
	buf_len += 1;

	/* append int value onto the end of the name string */
	memcpy(&buf[buf_len], val, len);
	buf_len += len;

	return wl_ioctl(name, WLC_SET_VAR, buf, buf_len);
}

int
wl_get_val(char *name, char *var, void *val, int len)
{
	char buf[128];
	int ret;

	/* check for overflow */
	if (strlen(var) + 1 > sizeof(buf) || len > sizeof(buf))
		return -1;
	
	strcpy(buf, var);
	if ((ret = wl_ioctl(name, WLC_GET_VAR, buf, sizeof(buf))))
		return ret;

	memcpy(val, buf, len);
	return 0;
}

int
wl_set_int(char *name, char *var, int val)
{
	return wl_set_val(name, var, &val, sizeof(val));
}

int
wl_get_int(char *name, char *var, int *val)
{
	return wl_get_val(name, var, val, sizeof(*val));
}

/**************************************************************************
 *  The following code is from Broadcom (wl.c)                            *
 **************************************************************************/

int 
wl_iovar_getbuf(char *ifname, char *iovar, void *param,
		int paramlen, void *bufptr, int buflen)
{
	int err;
	uint namelen;
	uint iolen;

	namelen = strlen(iovar) + 1;	 /* length of iovar name plus null */
	iolen = namelen + paramlen;

	/* check for overflow */
	if (iolen > buflen) 
		return (-1);

	memcpy(bufptr, iovar, namelen);	/* copy iovar name including null */
	memcpy((int8*)bufptr + namelen, param, paramlen);

	err = wl_ioctl(ifname, WLC_GET_VAR, bufptr, buflen);
	
	return (err);
}

int 
wl_iovar_setbuf(char *ifname, char *iovar, void *param,
		int paramlen, void *bufptr, int buflen)
{
	uint namelen;
	uint iolen;

	namelen = strlen(iovar) + 1;	 /* length of iovar name plus null */
	iolen = namelen + paramlen;

	/* check for overflow */
	if (iolen > buflen) 
		return (-1);

	memcpy(bufptr, iovar, namelen);	/* copy iovar name including null */
	memcpy((int8*)bufptr + namelen, param, paramlen);

	return wl_ioctl(ifname, WLC_SET_VAR, bufptr, iolen);
}

int
wl_iovar_set(char *ifname, char *iovar, void *param, int paramlen)
{
	char smbuf[WLC_IOCTL_SMLEN];

	return wl_iovar_setbuf(ifname, iovar, param, paramlen, smbuf, sizeof(smbuf));
}

int
wl_iovar_get(char *ifname, char *iovar, void *bufptr, int buflen)
{
	char smbuf[WLC_IOCTL_SMLEN];
	int ret;

	/* use the return buffer if it is bigger than what we have on the stack */
	if (buflen > sizeof(smbuf)) {
		ret = wl_iovar_getbuf(ifname, iovar, NULL, 0, bufptr, buflen);
	} else {
		ret = wl_iovar_getbuf(ifname, iovar, NULL, 0, smbuf, sizeof(smbuf));
		if (ret == 0)
			memcpy(bufptr, smbuf, buflen);
	}

	return ret;
}

/* 
 * set named driver variable to int value
 * calling example: wl_iovar_setint(ifname, "arate", rate) 
*/
int
wl_iovar_setint(char *ifname, char *iovar, int val)
{
	return wl_iovar_set(ifname, iovar, &val, sizeof(val));
}

/* 
 * get named driver variable to int value and return error indication 
 * calling example: wl_iovar_getint(ifname, "arate", &rate) 
 */
int
wl_iovar_getint(char *ifname, char *iovar, int *val)
{
	return wl_iovar_get(ifname, iovar, val, sizeof(int));
}

/* 
 * format a bsscfg indexed iovar buffer
 */
static int
wl_bssiovar_mkbuf(char *iovar, int bssidx, void *param,
		  int paramlen, void *bufptr, int buflen, int *plen)
{
	char *prefix = "bsscfg:";
	int8* p;
	uint prefixlen;
	uint namelen;
	uint iolen;

	prefixlen = strlen(prefix);	/* length of bsscfg prefix */
	namelen = strlen(iovar) + 1;	/* length of iovar name + null */
	iolen = prefixlen + namelen + sizeof(int) + paramlen;

	/* check for overflow */
	if (buflen < 0 || iolen > (uint)buflen) {
		*plen = 0;
		return -1;
	}

	p = (int8*)bufptr;

	/* copy prefix, no null */
	memcpy(p, prefix, prefixlen);	
	p += prefixlen;

	/* copy iovar name including null */
	memcpy(p, iovar, namelen);	
	p += namelen;

	/* bss config index as first param */
	memcpy(p, &bssidx, sizeof(int32));
	p += sizeof(int32);
	
	/* parameter buffer follows */
	if (paramlen)
		memcpy(p, param, paramlen);

	*plen = iolen;
	return 0;
}

/* 
 * set named & bss indexed driver variable to buffer value
 */
int
wl_bssiovar_setbuf(char *ifname, char *iovar, int bssidx, void *param, 
		   int paramlen, void *bufptr, int buflen)
{
	int err;
	uint iolen;

	err = wl_bssiovar_mkbuf(iovar, bssidx, param, paramlen, bufptr, buflen, &iolen);
	if (err)
		return err;
	
	return wl_ioctl(ifname, WLC_SET_VAR, bufptr, iolen);
}

/* 
 * get named & bss indexed driver variable buffer value
 */
int
wl_bssiovar_getbuf(char *ifname, char *iovar, int bssidx, void *param, 
		   int paramlen, void *bufptr, int buflen)
{
	int err;
	uint iolen;

	err = wl_bssiovar_mkbuf(iovar, bssidx, param, paramlen, bufptr, buflen, &iolen);
	if (err)
		return err;
	
	return wl_ioctl(ifname, WLC_GET_VAR, bufptr, buflen);
}

/* 
 * set named & bss indexed driver variable to buffer value
 */
int
wl_bssiovar_set(char *ifname, char *iovar, int bssidx, void *param, int paramlen)
{
	char smbuf[WLC_IOCTL_SMLEN];

	return wl_bssiovar_setbuf(ifname, iovar, bssidx, param, paramlen, smbuf, sizeof(smbuf));
}

/* 
 * get named & bss indexed driver variable buffer value
 */
int
wl_bssiovar_get(char *ifname, char *iovar, int bssidx, void *outbuf, int len)
{
	char smbuf[WLC_IOCTL_SMLEN];
	int err;

	/* use the return buffer if it is bigger than what we have on the stack */
	if (len > (int)sizeof(smbuf)) {
		err = wl_bssiovar_getbuf(ifname, iovar, bssidx, NULL, 0, outbuf, len);
	} else {
		memset(smbuf, 0, sizeof(smbuf));
		err = wl_bssiovar_getbuf(ifname, iovar, bssidx, NULL, 0, smbuf, sizeof(smbuf));
		if (err == 0)
			memcpy(outbuf, smbuf, len);
	}

	return err;
}

/* 
 * set named & bss indexed driver variable to int value
 */
int
wl_bssiovar_setint(char *ifname, char *iovar, int bssidx, int val)
{
	return wl_bssiovar_set(ifname, iovar, bssidx, &val, sizeof(int));
}